Air supply device

Abstract

The utility model discloses an air supply device, which comprises a frame, an air supply device, an air supply device and an air supply device, the air supply unit is arranged in the containing space and comprises a volute, a vortex air inlet and a vortex air outlet are formed in the volute, a volute tongue is formed in the position, close to the vortex air outlet, of the volute, and external air enters the frame through the air inlet, then enters the volute through the vortex air inlet and flows out of the volute through the vortex air outlet; the air guide part is arranged at the vortex air outlet and divides the vortex air outlet into a first outlet far away from the volute tongue and a second outlet close to the volute tongue, and the inner diameter of the first outlet is larger than that of the second outlet.

Description

TECHNICAL FIELD

[0001] At least one embodiment of the present application relates to the ventilation technical field, and particularly to an air supply device. BACKGROUND

[0002] The air supply device can discharge indoor gas to the outdoor. By connecting the air outlet with the pipeline outside, the indoor gas can be discharged to the outdoor. However, in the prior art air supply device, when the external wind pressure is high or the pipeline connected to the outdoor is long, the resistance to the outflow of the gas in the pipeline is too large, thus causing part of the gas to flow back. The backflow gas collides with the high-speed gas flow to form turbulence, thus producing an abnormal sound. In addition, due to the backflow of part of the gas, the outflow of the gas is reduced, thus affecting the air supply efficiency. SUMMARY

[0003] In order to solve the above problems, the present application provides an air supply device capable of effectively reducing abnormal sound.

[0004] The present application provides an air supply device, comprising: a frame, which forms an accommodation space, and an air inlet and an air outlet are formed on the side wall of the frame; an air supply unit, which is arranged in the accommodation space, and the air supply unit comprises a volute, the volute forms a vortex air inlet and a vortex air outlet, and a volute tongue is formed near the vortex air outlet, external gas enters the frame through the air inlet, enters the volute through the vortex air inlet, and flows out of the volute through the vortex air outlet; and an air guide part, which is arranged at the vortex air outlet and separates the vortex air outlet into a first outlet away from the volute tongue and a second outlet close to the volute tongue, and the inner diameter of the first outlet is larger than that of the second outlet.

[0005] Optionally, the air supply device further comprises an adapter part, which forms a transition section connected with the vortex air outlet, and the inner diameter of the transition section gradually decreases from the vortex air outlet to the air outlet.

[0006] Optionally, the air guide part comprises a partition plate, which extends from the vortex air outlet to the transition section.

[0007] Optionally, the partition plate extends obliquely from the vortex air outlet to the transition section, and separates the transition section into a first channel and a second channel, and the inner diameter of the first channel gradually decreases from the vortex air outlet to the air outlet.

[0008] Optionally, the partition plate forms a curved surface towards the side of the volute tongue.

[0009] Optionally, the air guide part comprises two flaps respectively extended from two ends of the partition plate in a direction perpendicular to the partition plate, and two ear plates, each of which is connected with one of the flaps; wherein the adapter part is formed with ear grooves matched with the ear plates, so that the air guide part is mounted on the adapter part based on the matching of the ear grooves and the ear plates.

[0010] Optionally, the adapter part comprises a mounting plate, one end of which is formed with a clamping groove configured to match with a clamping block of the volute to mount the adapter part on the volute, an extension section configured in a cylindrical shape, and the transition section configured to connect the mounting plate with the extension section.

[0011] Optionally, the air supply unit further comprises a driving part arranged in the volute, and a fan blade arranged in the volute and connected with an output shaft of the driving part, the air inlet is arranged in an axial direction of the output shaft, and the driving part drives the fan blade to rotate to allow external air to enter the air inlet and the volute in sequence.

[0012] Optionally, a ratio of an inner diameter of the second outlet to an inner diameter of the first outlet is 0.6-0.7.

[0013] Optionally, the air guide part is aligned with a side of the volute tongue close to the vortex outlet.

[0014] Optionally, an included angle between the partition plate and a plane where the vortex outlet is located is greater than an included angle between a side of the transition section away from the volute tongue and the plane where the vortex outlet is located.

[0015] According to the embodiments of the present disclosure, the vortex outlet can be divided into the first outlet and the second outlet by arranging the air guide part. The first outlet can be used to allow the air in the volute to flow out of the volute. The second outlet can be used to allow part of the flowing air to flow back, that is, the second outlet provides a space for the flowing back air to flow, and the air guide part can divide the flowing air and the flowing back air, so that the flowing air and the flowing back air can be prevented from colliding at the volute tongue, and the turbulent flow can be avoided, thereby reducing abnormal sound. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0017] Figure 1 Schematically shows the sectional view of the air supply device of the utility model.

[0018] Figure 2 Schematically shows the sectional view of the air supply device of the utility model.

[0019] Figure 3 Schematically shows the sectional view of the air supply device of the utility model.

[0020] Reference signs

[0021] 1, frame; 11, containing space; 2, air supply unit; 21, volute; 211, clamping block; 212, lower volute plate; 213, coiled plate; 22, vortex air inlet; 23, vortex air outlet; 231, first outlet; 232, second outlet; 24, volute tongue; 3, air guide part; 31, partition plate; 32, folded plate; 33, ear plate; 4, adapter part; 41, transition section; 42, mounting plate; 421, ear groove; 422, clamping groove; 423, dismounting ear part; 43, extension section; 25, output shaft; 26, fan blade. DETAILED DESCRIPTION

[0022] To make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present disclosure.

[0023] The following orientation or positional relationship is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0024] In the description of the present disclosure, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0025] Figure 1 Schematically shows the sectional view of the air supply device of the utility model. Figure 2 Schematically shows the sectional view of the air supply device of the utility model. Figure 3 Schematically shows the sectional view of the air supply device of the utility model.

[0026] like Figure 1 As shown, the air supply device in this embodiment can be a device that discharges gas drawn into the first space to the second space, i.e., a device with a ventilation function. The air supply device can also be a device that heats the gas drawn into the first space before discharging it back into the first space, i.e., a device that simultaneously has ventilation and heating functions. For example, the air supply device can be a heating exhaust fan. In this usage scenario, the first space can be a bathroom, and the second space can be outside the bathroom.

[0027] like Figures 1-3 As shown, in some embodiments, the air supply device may include a frame 1, an air supply unit 2, and an air guide 3. The frame 1 may form a receiving space 11. An air inlet and an air outlet are formed on the side wall of the frame 1. External gas can enter the air supply device through the air inlet and flow out of the air supply device through the air outlet. The air supply unit 2 may be disposed within the receiving space 11. The air supply unit 2 may include a volute 21. The volute 21 may form a vortex air inlet 22 and a vortex air outlet 23. A volute tongue 24 may be formed on the volute 21 near the vortex air outlet 23. The volute tongue 24 can compress and accelerate the gas inside the volute 21, thereby forming a high-speed airflow. After the external gas enters the frame 1 through the air inlet, it can enter the volute 21 through the vortex air inlet 22 and flow out of the volute 21 through the vortex air outlet 23. The air supply unit 2 can be used to draw external gas into the air supply device; for example, the air supply device can be a centrifugal fan, such as a multi-blade centrifugal fan. External gas can refer to the gas outside the air supply device, such as the gas in the first space mentioned above. In this embodiment, the air guide 3 can be provided at the vortex outlet 23, and the vortex outlet 23 can be divided into a first outlet 231 (e.g., Figure 1 The left side of the vortex outlet 23 shown) and the second outlet 232 (as shown) Figure 1 (The right side of the vortex outlet 23 shown). The inner diameter of the first outlet 231 is larger than the inner diameter of the second outlet 232. In this case, the gas forming the high-speed airflow can flow out from the first outlet 231. The second outlet 232 is configured to allow some of the outflowing gas to flow back, so as to prevent the outflowing gas forming the high-speed airflow from colliding with the backflowing gas at the volute tongue 24, thereby avoiding the formation of turbulence and reducing abnormal noise.

[0028] like Figures 1-3As shown, in some embodiments, the air supply unit 2 may further include a drive unit and a fan blade 26. The drive unit (not shown) may be disposed within the volute 21. The fan blade 26 may be disposed within the volute 21 and connected to the output shaft 25 of the drive unit. The air inlet may be disposed in the axial direction of the output shaft 25. By controlling the rotation of the drive unit, the drive unit can drive the fan blade 26 to rotate, thereby allowing external gas to sequentially enter the air inlet and the volute 21. Further, the drive unit may be a motor. The fan blade 26 may be arranged perpendicular to the output shaft 25. The volute 21 may include an upper volute plate (not shown), a lower volute plate 212, and a coiled plate 213 disposed between the upper and lower volute plates 212. A volute tongue 24 is formed at the end of the coiled plate 213 near the vortex outlet 23. Gas can flow along the inner wall of the coiled plate 213 within the volute 21. A vortex inlet 22 is formed on the upper or lower volute plate 212. Both the vortex inlet 22 and the air inlet can be located in the axial direction of the output shaft 25. The area enclosed by the two ends of the coil plate 213, the upper volute plate, and the lower volute plate 212 can form the vortex outlet 23.

[0029] In some embodiments, the ratio of the inner diameter of the second outlet 232 to the inner diameter of the first outlet 231 can be 0.6 to 0.7. Specifically, as shown in the figure... Figure 1 As shown, the ratio of the inner diameter H1 of the second outlet 232 to the inner diameter H2 of the first outlet 231 can be 0.6 to 0.7. By setting the air guide 3, the airflow at the vortex outlet 23 can be partitioned, thereby reducing the collision between the returning gas and the outgoing high-speed airflow. In the case of backflow generated by the air supply device, a sufficient buffer area can be provided for the backflow, reducing the collision between the high-speed airflow and the returning gas, avoiding the formation of turbulence, and thus suppressing the generation of abnormal noise. Furthermore, a ratio of 0.618 can achieve a better suppression effect.

[0030] like Figures 1-3 As shown, in some embodiments, the air guide 3 is aligned with the side of the volute tongue 24 near the vortex outlet 23. Figure 1 As shown, the side of the volute tongue 24 near the vortex outlet 23 (as shown) Figure 1 The lower surface of the volute tongue 24 shown) and the first end of the air guide 3 near the vortex outlet 23 (as shown) Figure 1 The upper end of the air guide 3 shown is aligned, that is, the first end of the air guide 3 (as shown) Figure 1 The upper end of the air guide 3 shown is on the same horizontal plane as the side of the volute tongue 24 near the vortex outlet 23, so that the smooth flow of gas can be maintained and it is relatively close to the volute tongue 24, thus achieving a better diversion effect.

[0031] like Figures 1-3As shown in some embodiments, the air supply device can further comprise an adapter 4. The adapter 4 can be formed with a transition section 41 connected with the vortex air outlet 23. The air guide portion 3 can extend to the transition section 41. The inner diameter of the transition section 41 gradually decreases from the vortex air outlet 23 to the air outlet direction, so as to improve the static pressure in the transition section 41. When the air duct of the volute 21 is short, the air guide portion 3 can also be arranged in the adapter 4. The adapter 4 is arranged at the downstream end of the vortex air outlet 23, and can be used to connect the external pipeline with the frame 1. The air guide portion 3 of the present embodiment is arranged in the adapter 4. The static pressure refers to the pressure on the surface of an object when the object is at rest or moving at a constant speed in a straight line. In the present application, the static pressure formed in the pipeline refers to the pressure formed in the pipeline to prevent the gas flowing out of the air outlet from flowing to the parallel surface. By gradually decreasing the inner diameter of the transition section 41 from the vortex air outlet 23 to the air outlet direction, the static pressure in the transition section 41 can be improved, and the static pressure in the transition section 41 can act on the external pipeline or external air pressure, so as to reduce the resistance to gas outflow, thereby reducing backflow and achieving the purpose of eliminating abnormal sound.

[0032] As shown in some embodiments, the air supply device can further comprise an adapter 4. The adapter 4 can be formed with a transition section 41 connected with the vortex air outlet 23. The air guide portion 3 can extend to the transition section 41. The inner diameter of the transition section 41 gradually decreases from the vortex air outlet 23 to the air outlet direction, so as to improve the static pressure in the transition section 41. When the air duct of the volute 21 is short, the air guide portion 3 can also be arranged in the adapter 4. The adapter 4 is arranged at the downstream end of the vortex air outlet 23, and can be used to connect the external pipeline with the frame 1. The air guide portion 3 of the present embodiment is arranged in the adapter 4. The static pressure refers to the pressure on the surface of an object when the object is at rest or moving at a constant speed in a straight line. In the present application, the static pressure formed in the pipeline refers to the pressure formed in the pipeline to prevent the gas flowing out of the air outlet from flowing to the parallel surface. By gradually decreasing the inner diameter of the transition section 41 from the vortex air outlet 23 to the air outlet direction, the static pressure in the transition section 41 can be improved, and the static pressure in the transition section 41 can act on the external pipeline or external air pressure, so as to reduce the resistance to gas outflow, thereby reducing backflow and achieving the purpose of eliminating abnormal sound. Figures 1-3 As shown in some embodiments, the air guide portion 3 can comprise a partition plate 31. The partition plate 31 can extend from the vortex air outlet 23 to the transition section 41, and separate the vortex air outlet 23 into a first outlet 231 away from the volute tongue 24 and a second outlet 232 close to the volute tongue 24, so as to allow part of the outflowing gas to backflow through the second outlet 232. The partition plate 31 can be a sheet structure or a rib structure. The partition plate 31 can extend from the vortex air outlet 23 to the air outlet direction. The partition plate 31 can comprise a first end close to the vortex air outlet 23 (such as the upper end of the partition plate 31 as shown in the figure) and a second end close to the air outlet (such as the lower end of the partition plate 31 as shown in the figure). Figure 1 As shown in some embodiments, the air guide portion 3 can comprise a partition plate 31. The partition plate 31 can extend from the vortex air outlet 23 to the transition section 41, and separate the vortex air outlet 23 into a first outlet 231 away from the volute tongue 24 and a second outlet 232 close to the volute tongue 24, so as to allow part of the outflowing gas to backflow through the second outlet 232. The partition plate 31 can be a sheet structure or a rib structure. The partition plate 31 can extend from the vortex air outlet 23 to the air outlet direction. The partition plate 31 can comprise a first end close to the vortex air outlet 23 (such as the upper end of the partition plate 31 as shown in the figure) and a second end close to the air outlet (such as the lower end of the partition plate 31 as shown in the figure). Figure 1 As shown in some embodiments, the air guide portion 3 can comprise a partition plate 31. The partition plate 31 can extend from the vortex air outlet 23 to the transition section 41, and separate the vortex air outlet 23 into a first outlet 231 away from the volute tongue 24 and a second outlet 232 close to the volute tongue 24, so as to allow part of the outflowing gas to backflow through the second outlet 232. The partition plate 31 can be a sheet structure or a rib structure. The partition plate 31 can extend from the vortex air outlet 23 to the air outlet direction. The partition plate 31 can comprise a first end close to the vortex air outlet 23 (such as the upper end of the partition plate 31 as shown in the figure) and a second end close to the air outlet (such as the lower end of the partition plate 31 as shown in the figure).

[0033] As shown in some embodiments, the air guide portion 3 can comprise a partition plate 31. The partition plate 31 can extend from the vortex air outlet 23 to the transition section 41, and separate the vortex air outlet 23 into a first outlet 231 away from the volute tongue 24 and a second outlet 232 close to the volute tongue 24, so as to allow part of the outflowing gas to backflow through the second outlet 232. The partition plate 31 can be a sheet structure or a rib structure. The partition plate 31 can extend from the vortex air outlet 23 to the air outlet direction. The partition plate 31 can comprise a first end close to the vortex air outlet 23 (such as the upper end of the partition plate 31 as shown in the figure) and a second end close to the air outlet (such as the lower end of the partition plate 31 as shown in the figure). Figures 1-3 As shown in some embodiments, the air guide portion 3 can comprise a partition plate 31. The partition plate 31 can extend from the vortex air outlet 23 to the transition section 41, and separate the vortex air outlet 23 into a first outlet 231 away from the volute tongue 24 and a second outlet 232 close to the volute tongue 24, so as to allow part of the outflowing gas to backflow through the second outlet 232. The partition plate 31 can be a sheet structure or a rib structure. The partition plate 31 can extend from the vortex air outlet 23 to the air outlet direction. The partition plate 31 can comprise a first end close to the vortex air outlet 23 (such as the upper end of the partition plate 31 as shown in the figure) and a second end close to the air outlet (such as the lower end of the partition plate 31 as shown in the figure).Figure 1 The left side of the transition segment 41 shown) and the second channel (as shown) Figure 1 (The right side of the transition section 41 shown). The inner diameters of both the first and second channels gradually decrease from the vortex outlet 23 towards the outlet to increase the static pressure within the first and second channels. The first channel can be the portion of the transition section 41 furthest from the volute tongue 24. The second channel can be the portion of the transition section 41 closest to the volute tongue 24. The inner diameter of the first channel can be expressed as the distance between the radial cross-section of the partition plate 31 and the radial cross-section of the transition section 41 furthest from the volute tongue 24. The inner diameter of the second channel can be expressed as the distance between the radial cross-section of the partition plate 31 and the radial cross-section of the transition section 41 closest to the volute tongue 24. That is, in the installed state of the air supply device, in the vertical direction, the partition plate 31 divides the transition section 41 into the first and second channels located on the left and right sides. By setting the inner diameters of both the first and second channels to gradually decrease from the vortex outlet 23 towards the outlet, the static pressure within the first and second channels can be increased. The static pressure in the first and second channels can act on the external pipes or external wind pressure, thereby reducing the resistance that prevents gas from flowing out, thus reducing backflow and eliminating abnormal noise.

[0034] Furthermore, the angle between the plane of the partition plate 31 and the plane of the vortex outlet 23 is greater than the angle of the transition section 41 away from the volute tongue 24 (e.g., Figure 1 The angle between the left side of the transition section 41 shown and the plane where the vortex outlet 23 is located. For example, as Figure 1 As shown, the angle α between the partition plate 31 and the plane containing the vortex outlet 23 can be 85°. The angle θ between the side of the transition section 41 away from the volute tongue 24 and the plane containing the vortex outlet 23 can be 70°.

[0035] In some embodiments, the partition plate 31 may be formed with a curved surface protruding toward the volute tongue 24, and the recirculating gas may flow along the curved surface, i.e., the recirculating gas is guided to flow from the second outlet 232. The curved surface may be located near the second end of the partition plate 31, thereby guiding the recirculating gas to flow back from the second outlet 232 at the initial moment of recirculation.

[0036] like Figures 1-3As shown, in some embodiments, the air guide 3 may include two folding plates 32 and two ear plates 33. The two folding plates 32 may extend from both ends of the partition plate 31 in a direction perpendicular to the partition plate 31. Each ear plate 33 may be connected to one folding plate 32. An ear groove 421 that matches the shape of the ear plate 33 may be formed on the adapter 4, so that the air guide 3 can be installed on the adapter 4 based on the fit between the ear groove 421 and the ear plate 33. The ear groove 421 may be recessed from the inner side of the edge of the adapter 4. Threaded holes may be provided on the ear groove 421 and the ear plate 33, so that the ear groove 421 and the ear plate 33 can be fixed by threaded connection. With the ear groove 421 structure fixed, by setting the length and extension direction of the folding plate 32, the position of the partition plate 31 at the vortex outlet 23 can be set, thereby setting the area ratio of the first outlet 231 to the second outlet 232. Furthermore, by setting the folding plate 32, the upper and lower ends of the air guide 3 are both shaped like the number 7, which can improve the stability of the air guide 3.

[0037] like Figures 1-3 As shown, in some embodiments, the adapter 4 may include a mounting plate 42, an extension 43, and a transition section 41. The first end of the mounting plate 42 (e.g., Figure 2 The upper end of the mounting plate 42 shown may have a slot 422. The slot 422 is configured to engage with the locking block 211 of the volute 21 to mount the adapter 4 onto the volute 21. The locking block 211 may extend obliquely upward to make it easier for the adapter 4 to be hooked onto the volute 21. The second end of the mounting plate 42 (as shown) Figure 2 The lower end of the mounting plate 42 shown may have a disassembly lug 423 perpendicular to the mounting plate 42. The adapter 4 can be separated from the volute 21 by operating the disassembly lug 423 using an external tool. By setting the disassembly lug 423 perpendicular to the mounting plate 42, i.e., extending perpendicular to the direction of gravity of the mounting plate 42, the disassembly lug 423 can provide support. The extension section 43 may be constructed in a cylindrical shape, allowing gas flowing from the vortex outlet 23 to flow through the extension section 43 to the air outlet. The extension section 43 may connect to an external duct at the air outlet. The transition section 41 may be configured to connect the mounting plate 42 and the extension section 43.

[0038] The embodiments of this utility model have now been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of this utility model.

[0039] It should be noted that implementations not shown or described in the accompanying drawings or the main text of the specification are all forms known to those skilled in the art and are not described in detail. Furthermore, the definitions of the components described above are not limited to the specific structures and shapes mentioned in the embodiments, and those skilled in the art can easily modify or substitute them.

[0040] The above detailed embodiments further explain the purpose, technical solutions and beneficial effects of the present application, and it should be understood that the above are only specific embodiments of the present application and are not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An air supply device, characterized by comprising: The application relates to a frame, a blower unit and a guide part. The frame is formed with a containing space, and an air inlet and an air outlet are formed on the side wall of the frame. The blower unit is arranged in the containing space and comprises a volute formed with a vortex air inlet and a vortex air outlet. The volute is formed with a volute tongue near the vortex air outlet. External air enters the frame through the air inlet, enters the volute through the vortex air inlet and flows out of the volute through the vortex air outlet.

2. The air supply device according to claim 1, wherein The guide part is arranged at the vortex air outlet and separates the vortex air outlet into a first outlet away from the volute tongue and a second outlet close to the volute tongue.

3. The air supply device according to claim 2, wherein The inner diameter of the first outlet is larger than that of the second outlet.

4. The air supply device according to claim 3, wherein The guide part further comprises an adapter part formed with a transition section connected with the vortex air outlet.

5. The air supply device according to claim 3, wherein The inner diameter of the transition section gradually decreases from the vortex air outlet to the air outlet.

6. The air supply device according to claim 3, wherein The guide part comprises a partition plate extending from the vortex air outlet to the transition section. The partition plate extends from the vortex air outlet to the transition section in an inclined manner and separates the transition section into a first channel and a second channel. The inner diameter of the first channel gradually decreases from the vortex air outlet to the air outlet. The partition plate is formed with a curved surface towards the volute tongue.

7. The air supply device according to claim 2, wherein The guide part comprises two flaps respectively extending from two ends of the partition plate in a direction perpendicular to the partition plate and two ear plates each connected with one of the flaps. The adapter part is formed with ear grooves matched with the ear plates. The adapter part comprises an installation plate formed at one end with a clamping groove matched with a clamping block of the volute to install the adapter part on the volute. The adapter part further comprises an extension section in a cylindrical shape through which air flows from the vortex air outlet to the air outlet.

8. The air supply device according to claim 1, wherein The transition section connects the installation plate with the extension section. The blower unit further comprises a driving part arranged in the volute and a fan blade arranged in the volute and connected with an output shaft of the driving part. The air inlet is arranged in the axial direction of the output shaft.

9. The air supply device according to claim 1, wherein The driving part drives the fan blade to rotate so that external air enters the air inlet and the volute in sequence.

10. The air supply device according to claim 1, wherein The ratio of the inner diameter of the second outlet to that of the first outlet is 0.6-0.

7.

11. The air supply device according to claim 4, wherein The guide part is aligned with the side of the volute tongue close to the vortex air outlet. The angle between the partition plate and the plane where the vortex air outlet is located is larger than the angle between the volute tongue side of the transition section away from the vortex air outlet and the plane where the vortex air outlet is located.

Images