Air supply opening suitable for long-distance air supply and usable in summer and winter

Technical Field

The invention relates to a ventilation air-conditioning of the local component, in particular to an air outlet, in particular to an air-feeding is suitable for long-distance air used both in winter and summer.

Background Art

The air outlet system of the air conditioner is the role of treated air into the room, in a building air supply downwards from the ceiling of the lobby of (goes against the blast), for example, to the requirements of the air outlet has two aspects.

Supply distance a is, also called air supply jet range. If the range is too short (such as lobbies high 9m, air outlet with a range of up to 5m), the jet (the cold wind or hot wind) does not reach the region where the human body, not to the air-conditioning effect. If the long range (such as lobbies high 9m, air outlet with a range of up to 15m), the jet (cold air or hot air) is blown to the region where the human body the wind speed is too large, causing blowing feeling , lead to discomfort of the human body.

The second is blowing the diffusion range, corresponding to the distance. Blowing the diffusion range is too large, the air supply will be spread to the air supply is not required, thereby causing energy waste. Blowing the diffusion range is too small, the air supply will not cover the entire air supply area, not to the air-conditioning effect.

Supply distance diffusion range and the wind delivery is contrary to the concept of two concepts. Air supply distance is great diffusion range is small, the small air supply distance diffusion range is large. In other words, the air-conditioning system, selecting suitable distance and the wind delivery air diffusion range of it is particularly important to the air outlet.

Furthermore, the present air-conditioning system is generally used in winter and summer system, warm air feeding in winter, in summer, the cold air feeding. Air supply from top to bottom, in winter the warm air, the surrounding air is cold. Furthermore, the air supply jet will be under the action of the floating force with the trend of the upward movement. Therefore, jet is difficult to to the ground, single has better diffusivity, that is, a need for greater air supply distance and smaller air supply the diffusion range. In contrast, in the summer, warm air supply air supply the same from top to bottom, the ambient air is hot. Furthermore, the air supply jet will be under the action of the floating force downward movement of the. Therefore, jet is easy to to the ground, a single diffusion discrepancily. Also the need for smaller air supply distance and greater air diffusion range. This requires that the air outlet of the air in the winter and summer with a range of different.

To sum up, air outlet in two of the most important parameter is the air distance diffusion range and the wind delivery, require a air outlet and with two different supply distance diffusion range and the wind delivery, long distance of sealing in winter with air diffusion range is small, short supply distance requirements in summer with air diffusion range is large.

Against the above-mentioned problem, diffusion and the wind delivery supply distance of the adjustable range of the air in winter and summer for the practice, of the existing several kinds of common air supply range adjustable air port:

1) utility model relates to electric adjustable air-port of China Patent application (application number: 01208882. X), see Figure 1. In the programme, through the air valve to adjust the blowing jet length. Air valve is fully open, the maximum air output, an air supply with a range of maximum, minimum resistance, can be used for working condition in winter, air valve closing is small, the minimum air output, air supply range becomes smaller, the maximum resistance, can be used in the summer condition.

2) utility model relates to adjustable-style of China Patent application (application number: 02248976.2), see Figure 2. In the programme, by changing the area of the air outlet in the form of air regulating air-wind jet length. Small area of the air outlet, the air and the air volume is small, air supply range becomes smaller, the maximum resistance, can be used in the summer condition. Hole area adjusting large, the feeding of the large air quantity, air supply range variable large, the resistance is the smallest, can be used for winter working condition.

3) invention relates to a multi-stage push-type adjustable air volume air outlet of China Patent application (application number 201410315250.4), see Figure 3. In this scheme, through regulating air outlet of the local resistance coefficient, the coefficient of resistance, the feeding and the air volume is small, air supply range becomes smaller, the maximum resistance, can be used in the summer condition. Hours coefficient of resistance, is the large air volume, air supply range variable large, the resistance is the smallest, can be used for winter working condition.

Therefore, the above-mentioned method or device has a certain innovative and applicability, but in the specific implementation, however, generally there are two problems : (1) when the adjust the wind range, a change in the blowing flow, resulting in insufficient or excessive air volume delivery, and then lead to the indoor air environment the supercooling or overheating. (2) when the adjusting air supply range, a change in the air supply pressure, the working state point changes cause that the fan, the fan so as to lead to wasted energy even blower fan overload burned.

Content of the invention

In order to solve the above-mentioned problem, the present invention provides a is suitable for long-distance delivery of the wind outlet for both in winter and summer, the outlet through the resistance of the double duct of the same and independent of the air supply through certain of the air conditioner in proportion to the combined air inlet, through the different area in the combined air through the outlets of the different means of the air volume air send the combined jet of air.

The purpose of this invention is achieved in the following manner:

A is suitable for long-distance delivery of the wind outlet for both in winter and summer, which comprises a shell, is arranged on one side of the outer shell open end, the closed end is arranged on the other side, in the opening end of the fan is arranged for, in order to install the combination with the closed end of the air outlet, within the housing is provided with a duct shunt device and the air quantity regulating device; said combined air outlet comprises a 1st S-shaped circular port elbow, 1st the mouth gradually expands with embedded circular rings, circular air outlet, an annular air outlet, an elbow and a 2nd S-shaped circular opening with embedded ring the mouth gradually expands 2nd, 1st S-shaped circular inlet elbow, with embedded ring the mouth gradually expands 1st, 2nd S-shaped circular port elbow and 2nd expandsmouth gradually with embedded ring fixed inside the housing, the elbow and the port-shaped circular 1st S with embedded ring mouth graduallyexpands the connection 1st, 2nd S-shaped circular opening of one end of the of the elbow of the embedded ring mouth graduallyexpands the connection can be 2nd, 2nd S-shaped circular opening into the other end of the elbow of the 1st in expandsmouth gradually with embedded ring, can be embedded into the embedded ring 1st 2nd S in expandsmouth gradually of the outlet elbow-shaped circular opening of the air outlet is circular, 1st and 2nd S the mouth gradually expands with embedded ring-shaped circular opening between the part of the elbow outlet is surrounded by an annular air outlet, a ring-shaped air outlet area greater than the area of the air outlet; the air duct distribution device comprises flexible partition within the housing, a flexible partition of the housing is divided into the upper air duct and air duct next delivers two air duct, the upper duct and elbow is 1st S-shaped circular opening, with the air delivery duct under 2nd expands the connectionmouth gradually with embedded ring; the air quantity regulating device includes is disposed within the housing of the air quantity adjusting plate and the hand, the air quantity adjusting plate in the hands, and the air quantity adjusting plate can slide in the slide by hand, the air quantity adjusting plate in the casing is fixedly connected with the flexible partition.

The 1st S-shaped circular port elbow and 2nd S-shaped circular opening of the same shape as the elbow.

The 1st and 2nd the mouth gradually expands with embedded ring can be the same as the shape of the embedded ring the mouth gradually expands , 1st and 2nd with embedded ring the mouth gradually expandsexpands parallelmouth gradually with embedded ring is provided, and the large end of the opposite direction of installation.

The shell is of one end of the hollow cylindrical shell.

The 1st the mouth gradually expands with embedded ring at the joint of the outer shell is provided with a sealing device.

The chute is arranged in the housing and is perpendicular to the two side walls of the closed end, the chute is hollowed-out chute, is arranged in the chute can move up and down along the chute adjusting wrench, one end of the regulating screw passes through the chute the level in the casing is connected with the flexible partition.

Compared with the existing air outlet, this invention has the following two characteristics: the regulating air supply range, no change occurs to the blowing flow. Guarantee the stability of the indoor air environment.

The range of adjustment of the air, the air supply pressure does not change. Guarantee smooth energy-saving operation of the air blowing fan.

Description of drawings

Figure 1 is a structure diagram of a conventional electric adjustable air-port.

Figure 2 is a structure diagram of a conventional adjustable-style.

Figure 3 is a structure diagram of a conventional multi-stage push-type adjustable air volume air outlet.

Figure 4 is a schematic diagram of the air flow route of the invention formed by the air in the two air duct.

Figure 5 is a schematic diagram of the combined air in the annular air outlet of the present invention with the round are combined to form the air outlet.

Figure 6 is a schematic diagram of the invention in the air volume adjusting wrench adjusted up and down, the upper air inlet of the air volume larger than that of the lower air delivery duct of the air intake volume.

Figure 7 is a schematic diagram of the invention in the air volume adjusting wrench adjusted up and down, the upper air inlet of the air supply duct to the air intake volume.

Figure 8 is a schematic diagram of the invention in the air volume adjusting wrench adjusted up and down, the upper air inlet of the air volume is less than the air quantity when the air delivery duct.

Figure 9 is a side view of the invention.

Figure 10 is a front view of the invention.

Figure 11 is of different jet length jet effect formed by the implementation of this invention.

Mode of execution

As shown in Figure 4-11 a is suitable for long-distance delivery of the wind outlet for both in winter and summer, which comprises a shell 10, is arranged on one side of the outer shell open end, the closed end is arranged on the other side, in the opening end of the fan is arranged for, in order to install the combination with the closed end of the air outlet, within the housing is provided with a duct shunt device and the air quantity regulating device; said combined air outlet comprises a 1st S-shaped circular inlet elbow 3, with embedded ring expanding mouth gradually 1st 4, circular air outlet 5, an annular air outlet 6, 2nd S-shaped circular port elbow 7 and 2nd enlarging mouth gradually with embedded ring 8, 1st S-shaped circular inlet elbow 3, with embedded ring expanding mouth gradually 1st 4, 2nd S-shaped circular port elbow 7 and 2nd enlarging mouth gradually with embedded ring 8 are fixed in the inside of outer cover, 1st S-shaped circular inlet elbow 3 and enlarging mouth gradually with embedded ring 1st 4 communicating, 2nd S-shaped circular port elbow 7 with one end of the expanding ring with embedded 2nd mouth gradually 8 is connected with, 2nd S-shaped circular port elbow 7 embedded in the other end of the 1st enlarging mouth gradually with embedded ring 4 the inner, can be embedded into the embedded ring expanding mouth gradually 1st 4 2nd S-shaped circular opening in the elbow outlet circular air outlet 5, with embedded ring expanding mouth gradually 1st 4 and 2nd S-shaped circular opening between the part of the elbow outlet is surrounded by an annular air outlet 6, an annular air outlet 6 area larger than that of a round air outlet 5 area; the air duct distribution device comprises flexible partition within the housing 9, the flexible baffle 9 of the housing is divided into the upper air duct and air duct next delivers two air duct, the upper duct and elbow is 1st S-shaped circular opening, with the air delivery duct under 2nd enlarging mouth gradually with embedded ring 8 connected with; the air quantity regulating device, which includes a sliding groove arranged in the casing 2 and air quantity adjusting plate hand 1, by air quantity adjusting plate 1 is mounted in the chute, and wind volume hand adjusting plate 1 can slide in the slide, the air quantity adjusting plate in the casing is fixedly connected with the flexible partition. 1st S-shaped circular inlet elbow 3 and 2nd S-shaped circular port elbow 7 have the same shape. 1st enlarging mouth gradually with embedded ring 4 and 2nd enlarging mouth gradually with embedded ring 8 is the same as the shape of the, expanding mouth gradually 1st with embedded ring 4 and 2nd enlarging mouth gradually with embedded ring 8 are arranged in parallel, and the large end of the opposite direction of installation.

The shell 10 of the opening at one end of the hollow cylindrical housing, with its open end in order to install the fan, with the closed end thereof in order to install the air outlet; 1st S-shaped circular inlet elbow 3, with embedded ring expanding mouth gradually 1st 4, 2nd S-shaped circular inlet elbow 7, 2nd enlarging mouth gradually with embedded ring 8 and a flexible baffle 9 are installed within the housing; expanding mouth gradually 1st with embedded ring 4 and the 2nd enlarging mouth gradually with embedded ring 8 and is in parallel to the axis of the direction of the two opposite reduces expands ; enlarging mouth gradually with embedded ring 1st 4 larger extends from the outer shell 10 of the side wall of the closed end, with the housing 10 is fixedly connected to the side wall of the; 1st S-shaped circular inlet elbow 3 and the lower end of the vertical installation with the 1st enlarging mouth gradually with embedded ring 4 is connected with the smaller end of the; 2nd S-shaped circular port elbow 7 and the lower end of the vertical installation with the 2nd enlarging mouth gradually with embedded ring 8 is connected with the smaller end of, its upper end extends into enlarging mouth gradually 1st with embedded ring 4 and the upper end of the 1st port located in enlarging mouth gradually with embedded ring 4 at the center of the larger end of the port, and the two form a ring round the air outlet 6 and is embedded in the annular air outlet 6 which is at the center of the circular air outlet 5 (i.e. 2nd S-shaped circular port elbow 7 at the lower end of the port).

An optional, enlarging mouth gradually 1st with embedded ring 4 and the outer casing 10 is provided with a sealing device.

Flexible baffle 9 adopts the flexible material, the flexible baffle 9 is horizontally fixed one side of the housing 10 the middle part of the inner wall of the closed end of the, other side of the flexible partition in sliding contact with the inner wall of the outer shell, outer shell 10 and is perpendicular to the two side walls of the closed end is provided with a vertical direction on the hollowed-out chute 2, the chute 2 is provided with a can along the chute in 2 to move up and down adjusting wrench 1, adjustable spanner 1 level through one end of the chute 2 and the outer casing 10 the flexible diaphragm 9 which is connected with, the flexible baffle 9 can along with adjustment wrench 1 to move up and down along the slide way swing up and down, thus the housing 10 is divided into a variable volume inside of the upper, and lower two independent air delivery duct.

The design makes the air supply in accordance with a certain proportion respectively 1st S-shaped circular opening into the elbow 3 and 2nd enlarging mouth gradually with embedded ring 8 the inner, so as to respectively from the ring-shaped air outlet 5 and a circular air outlet 6 send.

Optionally, with embedded ring expanding mouth gradually 1st 4 and 2nd enlarging mouth gradually with embedded ring 8 the same; 2nd S-shaped circular port elbow 7 and 1st S-shaped circular inlet elbow 3 the same.

1st of the present invention can be an embedded ring expanding mouth gradually 4 and 2nd enlarging mouth gradually with embedded ring 8 is connected as a whole a cylindrical channel and a trumpet-shaped channel. The horn mouth a circular transverse cross-section of the channel, longitudinal section is a trapezoid.

1st S of the invention elbow-shaped circular opening 3 through one end of the bracket is fixed within the housing, the other end of the expanding ring with embedded 1st mouth gradually 4 is connected with the; 2nd enlarging mouth gradually with embedded ring 8 through the enlargement of the bracket is fixed within the housing, with embedded ring expanding mouth gradually 2nd 8 on the lower end of the elbow 2nd S-shaped circular port 7 is connected with one end of the, 2nd S-shaped circular port elbow 7 embedded in the other end of the 1st in expandsmouth gradually with embedded ring.

Design idea of the present invention are as follows:

(1) inner circular air outlet, an annular air outlet

The circular inside the air outlet, an outer annular air outlet, is because the circular and annular air outlet of the blowing jet is more a other the air outlet. This type is provided with a lower combined air outlet, can meet the more remote air supply demand.

(2) adjusting the range of:

Design of this invention is a sandwich air outlet, in other words by the annular air outlet and its embedded a combination of the air outlet of the air outlet is formed, see Figure 4. Annular air outlet with the air outlet is larger than the area of the circular air outlet. Under the printhead-to-air, air-feeding speed ÷ air volume = area of the air outlet. That is, under the same volume, the greater the air outlet area of the air blowing speed is small. The feeding and air supply range of the wind speed, the greater the wind speed, the shorter the range of the air. That is, under the same air output, from a small area of the range of injection of the air of the air outlet is longer, from the large-area annular air outlet with a range of shorter injection of the air.

Therefore, this invention much looser by adjusting wrench, chute, flexible partitions to create different combined air supply of the form (such as 40% of the air volume entering the large-area round mouth, 60% of the air volume entering the small-area round mouth). Through the different air volume combined, lead to large-area annular air outlet, the air outlet of the small area of the wind speed-change. Resulting in the final finishing combined blowing jet with a range of length.

That is, the air supply of this invention the jet is composed of two areas, one is a circular small area of the air outlet of the jet, and is a large-area of the annular air port air supply jet. The integration of the two jet, is sent into the building space. If the air outlet of the air sent into the small area of a large volume ratio (limit case 100% full from the small area of the air outlet of the injection). Under the same air volume of the air supply large wind speed, feeding Arutyunyan the wind shoots. If into the large area of the annular air outlet large volume ratio (limit case 100% full from the large-area annular air outlet jet). The air supply under the same wind small wind speed, the air supply jet is short.

Can be also carried out by this kind of method the wind speed, that is, with a range of adjustment.

(3) resistance, such as, air quantity regulating such as:

Design of this invention is the two resistance completely equal air supply channel, and with not only the air into the volume ratio in the channel to adjust the blowing range, see Figure 5. Two in the channel resistance component is the largest 1st S-shaped circular port elbow and 1st and 2nd S the mouth gradually expands with embedded ring-shaped circular port elbow and 2nd enlarging mouth gradually with embedded ring. The elbow and the port-shaped circular 1st S 2nd S-shaped circular opening similar to the elbow body, the same drag coefficient, 1st and 2nd with embedded ring the mouth gradually expands to the mouth gradually expands with embedded ring, the same coefficient of resistance. Therefore, 1st S-shaped circular port elbow can be caused by the resistance of the embedded ring mouth gradually + 1st expands the institute = 2nd S caused by the resistance of the elbow-shaped circular opening can be + 2nd caused by the resistance of the resistance of the embedded ring the mouth gradually expands caused. In the two channels and also is completely the same air resistance. Whether to upregulate air volume adjusting spanner drives the flexible diaphragm to move upwards, resulting in smaller space in the upper, air intake quantity becomes smaller, also to the reduction of air volume adjusting spanner drives the flexible diaphragm moves downward, is lead to the lower space, air quantity becomes smaller. Its resistance in conditions did not undergo any change in the process, only volume ratio, as the air volume adjusting wrench upward, downward movement, the change.

In this invention the casing is connected directly with the pipe, pipe that is,

The position change of the air quantity regulating wrench directly cause the flexible the cutting of the air in the pipe shunt. The position of the air on the adjusting wrench, the air of the upper part of the air in the channel, on the contrary, the air at the lower part of the air in the channel, see Figure 6.

Furthermore, because the upper and lower in the two channels is the same as the resistance, therefore, regardless of how to carry out adjustment. Upper and lower two channels there has been no change in resistance caused by the. That is, no matter how the adjusting, there has been no change in the resistance of the entire air, that is, there has been no change in pressure loss.

Through the above-mentioned process can also realize the resistance is not variable, volume of the air supply under the condition of the range adjustment.

(4) air quantity regulating device, duct diverting device, is connected with the combined air outlet each other and need for the integrity of the

Air quantity adjusting device comprises adjusting wrench, chute, the flexible baffle, duct diverting device including 1st S-shaped circular inlet elbow, with embedded ring the mouth gradually expands 1st, 2nd S-shaped circular inlet elbow, with embedded ring expanding mouth gradually 2nd. Combined air inlet includes an annular air outlet, a circular air outlet. Because the purpose of this invention is to the air quantity is not changed, under the conditions of resistance with a range of air flow. This invention is through the two independent and resistance of the flow passage of the same, the area of different combined air inlet air supply, through the area of the inverse ratio relationship between the wind speed, changes in the wind speed, thus eventually lead to changes in the range of the combined air outlet. Therefore, the first condition is a first division of the air into the air pipe, of two independent time air partial, this requires air quantity regulating device; second, is to say, of the divided two independent portion of the air is the same as the resistance of the two pipe system, the air supply to the air outlet, this requires air duct diverting device. Finally, after the flow of the air into the room, this requires the combined air outlet.

In order to achieve the above-mentioned process, the design of the invention innovatively 1st S-shaped circular opening of the elbow, with embedded ring the mouth gradually expands 1st, 2nd S-shaped circular port elbow, 2nd the mouth gradually expands with embedded ring of between these four parts are mutually combined, form completely equal resistance, and effectively dividing air two air passage. Finally by two independent air passage, into the combined air outlet, by the combination of the round in the air outlet in the air outlet and the air supply speed-change, the range of the combined air supply to the resistance is not changed, the change of the air volume.

Working principle of this invention are as follows:

The work of this invention, first of all, a pipe the air into the 10 inner, by the flexible baffle plate 9 the feed air is divided into an upper part and a lower part, air flows into the upper part of the upper duct, the upper air duct is composed of a housing 10 the upper part of the, bend 1st S-shaped circular opening 3, with embedded ring expanding mouth gradually 1st 4 and a circular air outlet 5 ;; the lower air flows into the lower air delivery duct, the air duct is composed of a housing 10 the lower part of the, ring-shaped air outlet 6, 2nd S-shaped circular port elbow 7 and 2nd enlarging mouth gradually with embedded ring 8 ;; the upper air duct, the resistance of the air under the completely same, in other words 1st S-shaped circular inlet elbow 3 and 1st enlarging mouth gradually with embedded ring 4 and is equal to the resistance of the 2nd S-shaped circular port elbow 7 and the 2nd enlarging mouth gradually with embedded ring 8 and the resistance of the. The flow into the upper air duct and flows into the lower feeding the amount of air in the air duct through the flexible diaphragm 9 which is connected with the air volume adjusting wrench 1 and 2 is adjusted. After the air flows into the upper air duct, 1st S-shaped circular opening through the elbow 3, with embedded ring expanding mouth gradually 1st 4 into the annular air outlet 6 and the annular air outlet 6 send. After the air flows into the lower air delivery duct, 2nd S-shaped circular opening through the elbow 7, 2nd enlarging mouth gradually with embedded ring 8 into the circular air outlet 5 and is formed by a round air outlet 5 send. Because the circular air outlet 5 and the annular air outlet 6 of different area, so the same under different wind discharge speed of the air. If necessary a long jet with a range of air supply, is up-regulated air volume adjusting wrench 1, so that the amount of air entering the lower passage greater proportion. And if necessary a short jet with a range of air supply, is downward regulating air volume adjusting wrench 1, so that the amount of air entering the upper channel greater proportion.

Annular air outlet 6 and a circular air outlet 5 than the area of the air outlet of the range of the maximum and the minimum distance. If all the air sent from the upper air duct, then the range is the shortest, the meet condition in summer short range requirements. If all the air volume sent from the air duct, then the longest range, at this moment the requirements of long range to meet the working condition in winter.

Resistance and equivalent mechanism characteristic guarantee:

According to the known heating ventilating and air conditioning field, the local resistance of the pipeline can be calculated by the formula.

Pipe fittings of the local resistance formula is:

In the air channel of the local component includes 1st S-shaped circular port elbow (3), expanding mouth gradually with embedded ring 1st (4)

Its local resistance and

In the air channel of the local component includes 2nd S-shaped circular port elbow (7), with embedded ring expanding mouth gradually 2nd (8)

Its local resistance and

Because the, elbow 2nd S-shaped circular opening (7) and the 1st S-shaped circular port elbow (3) have the same structure, with embedded ring 1st mouth gradually expanded (4) and the 2nd enlarging mouth gradually with embedded ring (8) have the same structure. Therefore, in working condition in winter and summer operating condition,   ,   , ,   . Therefore, , That is, the working condition in winter, in summer the resistance of the same completely under the working condition.

The annular air outlet and the area of the air inlet than confirm:

Jet the longest and the shortest range can be determined according to the following calculation formula.

Formulas, a is turbulivity, is determined according to the round or annular air outlet, a value of 0.1 to 0.2, The wind speed is a circular or annular air outlet,   Jet end wind speed, general heating 0.5m/s,   The hydraulic diameter of the circular or annular air port, For range.

And, according to the air volume calculation formula:

, That is, , Into the range calculation formula is

Because Known, to 0.5m/s, a known, is 0.1 to 0.2. Known, in the field of air conditioning are of the well known calculation method, so that the air is actually x-supply range of the function of the hydraulic diameter, that is, . Therefore, according to the round nozzle can be under the working condition in winter and the maximum range (by the building space determination, known heating ventilation and air conditioning field), a circular spout solve

. Similarly, according to the annular nozzle under the working condition in the summer maximum range (by the building space determination, known heating ventilation and air conditioning field), the annular jet decoded . So as to obtain a circular ejector nozzle and area ratio between the annular nozzle.

Embodiment:

The following provides specific examples of the present invention, it should be explained that the invention is not limited to the following specific embodiment, where in the present application on the basis of the technical scheme of the identity transform are to fall into the scope of protection of this invention.

To comply with the above-mentioned technical scheme, regulating air wrench 1 size is 100 mm × 20 mm × 20 mm; groove 2 size of 1000 mm × 10 mm × 20 mm; 1st S-shaped circular inlet elbow 3 and 2nd S-shaped circular port elbow 7 a diameter of 100   mm, high 370   mm wide 190   mm; 1st enlarging mouth gradually with embedded ring 4 and the 2nd enlarging mouth gradually with embedded ring 8 for first diameter 100 mm, the diameter is 300 mm, long 230 mm. A circular air outlet 5 a diameter of 100 mm, an annular air outlet 6 to the inner diameter of 100 mm, the outer diameter is 300 mm. Flexible baffle 9 area of 700 mm × 500 mm, the outer cover 10 size is 750 mm × 500 mm × 1000 mm.

In the present invention is begun to be used, by adjusting the, forming different blowing jet length see Figure 9. Visible, in the constant air flow rate, constant resistance condition, the invention can effectively realize the jet length-changing.

At the same time, the air duct and the lower air duct arrangement different air supply under the condition of the proportion with a range of values, can be seen air volume adjusting wrench moving distance of the relations between and range sees the equation below :

In the formula, y as the range, is a round air outlet diameter d, in this example is 100 mm. , For x the height of the bottom surface of air volume adjusting wrench distance, the size of the air duct for interface D, in this example as 1000 mm. Visible, the diameter of the circular outlet, interface duct under the condition of certain size, and the range of the height of the bottom surface of the adjusting wrench is the linear relationship with the distance, can be adjusted conveniently.

The above is only the preferred embodiment of the invention, it should be noted that, with regard to the technical personnel in this field, without deviating from the overall design of this invention, also a number of changes and improvements can be made, these should also be regarded as the scope of protection of this invention.