Ventilation device

Abstract

The utility model relates to a ventilation device which comprises a volute, a motor and a centrifugal impeller. The volute comprises an air inlet duct and an air outlet duct, the tail end of the air inlet duct is connected with an inlet of the centrifugal impeller, and an outlet of the centrifugal impeller is connected with the air outlet duct. The air inlet duct comprises an air inlet section and an air guide section, the air inlet section is concavely arranged from the front face of the volute, the tail end of the air inlet section is connected with the head end of the air guide section, and the tail end of the air guide section is connected with an inlet of the centrifugal impeller. The average aperture of the air inlet section is larger than that of the air guide section, and the aperture of the tail end of the air inlet section is larger than or equal to that of the head end of the air guide section; the motor is located on the outer side of the head end of the air guide section and drives the centrifugal impeller through a rotating shaft or a transmission piece. The area of the air inlet of the volute is fully utilized, the area of the air outlet of the air outlet duct is increased as much as possible, under the condition that the ventilation device is at a certain height, the surface proportion of the air inlet and the air outlet reaches the best, and the ventilation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a ventilation device, especially applicable to ventilation in areas such as bathrooms and kitchens. Background Art

[0002] Ventilation devices are often used in places such as kitchens, bathrooms or offices. Such ventilation devices generally include a volute, a motor and a centrifugal impeller. Since the volume and thickness of the volute are restricted by the use environment, the motor is usually installed in the air inlet duct, so the air duct is restricted. One disadvantage of traditional ventilation devices is that the air resistance is large and the efficiency is low. Summary of the Utility Model

[0003] One object of this application is to improve the efficiency of the ventilation device.

[0004] To this end, this application provides a ventilation device, including a volute, a motor and a centrifugal impeller; the volute includes an air inlet duct and an air outlet duct, the end of the air inlet duct is connected to the inlet of the centrifugal impeller, and the outlet of the centrifugal impeller is connected to the air outlet duct; the air inlet duct includes an air inlet section and a wind guiding section, the air inlet section is recessed from the front of the volute, the end of the air inlet section is connected to the beginning of the wind guiding section, and the end of the wind guiding section is connected to the inlet of the centrifugal impeller; the average aperture of the air inlet section is larger than the average aperture of the wind guiding section, and the aperture at the end of the air inlet section is greater than or equal to the aperture at the beginning of the wind guiding section; the motor drives the centrifugal impeller through a rotating shaft or a transmission member.

[0005] In one embodiment of the utility model, the motor is located outside the beginning of the wind guiding section.

[0006] In one embodiment of the utility model, along the direction close to the centrifugal impeller, the aperture of the air inlet section remains unchanged or gradually decreases.

[0007] In one embodiment of the utility model, along the direction close to the centrifugal impeller, the aperture of the wind guiding section remains unchanged or gradually decreases.

[0008] In one embodiment of the utility model, the inlet of the air inlet section accounts for 45% to 90% of the area of the front of the volute, and the center of the inlet of the air inlet section deviates from the center of the front of the volute along the direction away from the side where the end of the air outlet duct is located.

[0009] In one embodiment of the utility model, the cross-section of the air inlet section includes one of the following: circular, oval, regular polygon, irregular figure.

[0010] In one embodiment of the utility model, the cross-section of the wind guiding section includes one of the following: circular, oval, regular polygon, irregular figure.

[0011] In one embodiment of the present utility model, the distance H2 from the motor to the leading end of the air guiding section is 30% - 70% of the depth H1 of the air inlet section.

[0012] In one embodiment of the present utility model, the depth H1 of the air inlet section is 30% - 60% of the volute height H3.

[0013] In one embodiment of the present utility model, it further includes a motor mounting bracket for mounting the motor. The motor mounting bracket is mounted to the inner wall of the air inlet duct, and all or most of the motor mounting bracket is located outside the leading end of the air guiding section.

[0014] In one embodiment of the present utility model, the motor mounting bracket includes a straight arm connecting piece. The radially outer end of the straight arm connecting piece is connected to the inner wall of the air guiding section or the inner wall of the air inlet section, and the radially inner end of the straight arm connecting piece mounts the motor.

[0015] In one embodiment of the present utility model, there are two straight arm connecting pieces, which are evenly distributed along the circumferential direction of the air inlet duct.

[0016] In one embodiment of the present utility model, it further includes an air outlet pipe connected to the end of the air outlet duct, and the aperture of the air outlet pipe is greater than or equal to the aperture of the end of the air outlet duct.

[0017] In one embodiment of the present utility model, the centrifugal impeller includes a hub portion, a connecting plate extending outward from the hub portion, and a plurality of blades connected to the connecting plate. The plurality of blades are arranged around the hub portion; the blades are reverse streamline-shaped blades; the hub portion is sleeved on the end of the rotating shaft or the transmission member.

[0018] In one embodiment of the present utility model, the motor is a single-pole motor, including a frame-shaped yoke portion, a stator winding sleeved on the frame-shaped yoke portion, and a rotor axially passing through the yoke portion.

[0019] The air inlet section of the present utility model is equivalent to an additional sunken space, which not only makes full use of the air inlet area of the volute but also maximizes the air outlet area of the air outlet duct as much as possible. When the height of the ventilation device is certain, the ratio of the air inlet and air outlet areas reaches the best, improving the ventilation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To further disclose the specific technical content of this case, please first refer to the attached drawings, where:

[0021] Figure 1 and Figure 2 are schematic diagrams of an embodiment of the ventilation device provided by the present utility model from different perspective directions;

[0022] Figure 3 Yes Figure 1 Schematic diagram of removing the cover plate of the ventilation device shown

[0023] Figure 4 And Figure 5 Yes Figure 1 Schematic diagrams of the ventilation components of the ventilation device shown in different perspective directions

[0024] Figure 6 And Figure 7 Yes Figure 4 Schematic diagrams of the volute of the ventilation component shown in different perspective directions

[0025] Figure 8 Yes Figure 4 Schematic diagram of the motor and centrifugal impeller used in the ventilation component shown

[0026] Figure 9 Yes Figure 4 Top view of the ventilation component shown

[0027] Figure 10 Yes Figure 9 Cross-sectional view of the A-A section of the ventilation component shown

[0028] Figure 11 Yes Figure 9 Cross-sectional view of the B-B section of the ventilation component shown Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be described in conjunction with the drawings of the present invention.

[0030] Please refer to Figure 1 , in one embodiment, the ventilation device 100 provided by the present invention includes a housing 21 with an open end, a cover plate 23 installed at the open end of the housing, and a ventilation component 30 disposed inside the housing 21 (see Figure 3 ). The cover plate 23 is provided with an air inlet hole 24, and the housing 21 is connected to an air outlet pipe 26 through a pipe connector 27. A flippable baffle 28 is disposed inside the air outlet pipe 26. In this embodiment, the air inlet hole 24 is a plurality of strip-shaped through holes, which cover the cover plate 23 as much as possible. The baffle 28 is in the shape of a thin sheet, and its shape and area match the inner hole of the air outlet pipe 26. The baffle 28 is rotatably installed on the pipe wall of the air outlet pipe 26, and its center of gravity deviates from the rotation axis. When the ventilation device 100 is not working, the baffle 28 flips down under the action of gravity to cover the air outlet pipe 26. When the ventilation device 100 is working, the baffle 28 is lifted by the air flow. The thin-sheet baffle 28 has a small obstruction to the air flow, reducing the blockage of the air flow.

[0031] Please refer to Figure 2, the air outlet pipe 26 is arranged on the side wall of the housing 21, between the cover plate 23 and the bottom plate 22 of the housing 21. In this embodiment, the air outlet pipe 26 is a circular pipe, the air outlet pipe 26 is separately formed from the housing 21, and is connected to the housing 21 through a pipe connector 27. As an alternative solution, the air outlet pipe 26 can be integrally formed with the housing 21.

[0032] Please refer to Figures 3 to 5 and Figure 10 , the ventilation assembly 30 includes a volute 40, a motor 60 and a centrifugal impeller 80. The volute 40 forms an air inlet duct 42 and an air outlet duct 47. The air inlet duct 42 is recessed in the front surface 41 of the volute 40, the first end of the air inlet duct 42 communicates with the air inlet hole 24 of the cover plate 23, the end of the air inlet duct 42 is connected to the inlet of the centrifugal impeller 80, and the outlet of the centrifugal impeller 80 is connected to the air outlet duct 47. In this embodiment, the air outlet duct 47 is spiral and surrounds the centrifugal impeller 80. Along the direction close to the air outlet pipe 26, the size of the air outlet duct 47 gradually increases.

[0033] The air inlet duct 42 includes an air inlet section 43 and a wind guiding section 45. The air inlet section 43 is recessed downward from the front surface 41 of the volute 40, the end of the air inlet section 43 is connected to the first end of the wind guiding section 45, and the end of the wind guiding section 45 is connected to the inlet of the centrifugal impeller 80. The average aperture of the air inlet section 43 is larger than the average aperture of the wind guiding section 45. In this specification and claims, the average aperture means: (1) for a part with a constant aperture, its aperture is equal to the average aperture; (2) for a part with a uniformly changing aperture, the sum of the first-end aperture and the end aperture, and then divided by 2 is equal to the average aperture; (3) for a part with an irregularly changing aperture, the aperture is integrated along the length direction and then divided by the length, which is equal to the average aperture.

[0034] In this embodiment, along the direction close to the centrifugal impeller 80, the size of the air inlet section 43 basically remains unchanged. Therefore, its aperture is equal to its average aperture; while the aperture of the wind guiding section 45 gradually decreases, and the aperture is integrated along the length direction (i.e., the direction close to the centrifugal impeller 80) and then divided by the length, which is equal to the average aperture of the wind guiding section 45. The aperture at the end of the air inlet section 43 is greater than or equal to the aperture at the first end of the wind guiding section 45.

[0035] In this embodiment, the cross-section of the air inlet section 43 is circular, the aperture of the air inlet section 43 basically remains unchanged, and the whole is cylindrical. The aperture of the wind guiding section 45 gradually shrinks, and the aperture at the end of the air inlet section 43 is greater than the aperture at the first end of the wind guiding section 45. Therefore, a stepped wind guiding part 44 is formed at the connection between the air inlet section 43 and the wind guiding section 45.

[0036] In the replacement solution, the air inlet section 43 is integrally frustum-shaped, the aperture diameter at the head end of the air inlet section 43 is basically larger than that at the tail end of the air inlet section 43, and the aperture diameter at the tail end of the air inlet section 43 is larger than or equal to the aperture diameter at the head end of the air guiding section 45. When the aperture diameter at the tail end of the air inlet section 43 is equal to the aperture diameter at the head end of the air guiding section 45, the aperture diameter of the air guiding section 45 preferably gradually decreases; when the aperture diameter at the tail end of the air inlet section 43 is larger than the aperture diameter at the head end of the air guiding section 45, the aperture diameter of the air guiding section 45 can gradually decrease or basically remain unchanged.

[0037] Understandably, the cross-section of the air inlet section 43 can also be other shapes, such as an ellipse, a regular polygon, an irregular figure, etc. The cross-section of the air guiding section 45 can also be a circle, an ellipse, a regular polygon, an irregular figure, etc. The aperture diameters of both the air inlet section 43 and the air guiding section 45 can remain unchanged or change uniformly, and their combination only needs to meet the following constraints: the average aperture diameter of the air inlet section 43 is larger than that of the air guiding section 45, and the aperture diameter at the tail end of the air inlet section 43 is larger than or equal to the aperture diameter at the head end of the air guiding section 45. The air inlet section 43 is equivalent to an additional sunken space, so as to make full use of the air inlet area of the front surface 41 of the volute 40 and increase the outlet area of the air outlet duct 47 as much as possible. When the height of the ventilation device is fixed, the ratio of the air inlet and outlet areas can reach the best, improving the ventilation efficiency.

[0038] Preferably, the area of the inlet of the air inlet section 43 accounts for 45% to 90% of the area of the front surface 41 of the volute 40, and the center of the inlet of the air inlet section 43 deviates from the center of the front surface 41 of the volute 40. More specifically, the center of the inlet of the air inlet section 43 deviates from the center of the front surface 41 of the volute 40 along the direction away from the side where the end of the air outlet duct 47 is located, as Figure 4 、 Figure 5 and Figure 9 shown. In this way, when the size of the front surface 41 of the volute 40 is fixed, the inlet area of the air inlet section 43 can be increased as much as possible, reducing the resistance and improving the efficiency; on the other hand, the center of the inlet of the air inlet section 43 deviates from the side where the end of the air outlet duct 47 is located, which can increase the size of the end of the air outlet duct 47 as much as possible, reducing the resistance and improving the efficiency. In this embodiment, the motor 60 is located outside the head end of the air guiding section 45, that is, inside the air inlet section 43. The motor 60 drives the centrifugal impeller 80 through a rotating shaft or a transmission member. Since the aperture diameter at the position where the motor 60 is located is relatively large (for example, larger than the average aperture diameter of the air guiding section 45), the blocking and influence of the motor 60 on the air flow can be significantly reduced, thereby improving the efficiency of the ventilation device.

[0039] Please refer to Figures 4 to 7 , the motor 60 is installed on the inner wall of the air inlet duct 42 through a motor mounting bracket 51. All or most of the motor mounting bracket 51 is located outside the head end of the air guiding section 45, that is, inside the air inlet section 43, so as to avoid or reduce the influence of the motor mounting bracket 51 on the air flow.

[0040] In this embodiment, the motor mounting bracket 51 includes two straight arm connectors 52, and the two straight arm connectors 52 are evenly distributed along the circumferential direction of the air inlet duct 42. The radially outer ends of the straight arm connectors 52 are connected to the inner wall near the leading end of the air guiding section 45 through bending portions 53, so that the straight arm connectors 52 are generally located outside the air guiding section 45. The radially inner ends of the straight arm connectors 52 are mounted with the motor 60. Understandably, the straight arm connectors 52 may not have bending portions, and the straight arm connectors may be connected to the inner wall of the air inlet section 43.

[0041] Reference Figures 8 to 10 , the motor 60 is a single-pole motor, including a frame-shaped yoke 61, a stator winding 63 sleeved on the frame-shaped yoke, and a rotor 65 axially passing through the yoke 61. Adopting a single-pole motor helps to simplify the structure and reduce the cost; at the same time, it also helps to simplify the structure of the motor mounting bracket 51 and reduce the blockage of the motor mounting bracket 51 to the air flow. In this embodiment, the two sides of the frame-shaped yoke are respectively fixed to the radially inner ends of the two straight arm connectors 52 through connectors, so as to realize the fixed installation of the motor 60, and make the stator of the motor 60 generally located outside the straight arm connectors 52 (that is, on the side of the straight arm connectors 52 away from the centrifugal impeller 80). The centrifugal impeller 80 includes a hub portion 82, a connecting plate 84 extending outward from the hub portion 82, and a plurality of blades 86 connected to the connecting plate 84. The plurality of blades 86 are arranged around the hub portion 82. The blades 86 are reverse streamline-shaped blades, so as to reduce noise. The hub 8 is sleeved on the end of the rotating shaft 82 of the motor.

[0042] In this embodiment, the blades 86 are all located on the same side of the connecting plate 84. The far-motor end of the blade 86 is connected to the connecting plate 84, and the near-motor end is connected to a reinforcing ring 88. This structure enables the blades 86 to better connect with the air outlet of the centrifugal impeller duct 48, reduce wind resistance and improve efficiency. In addition, the connecting plate 84 is also provided with a plurality of hollow openings 85 to reduce weight, reduce wind resistance and improve efficiency.

[0043] Please refer to Figure 5 、 Figures 9 to 11 , the height of the volute 40 is denoted as H3, the depth of the air inlet section 43 is denoted as H1, and the shortest distance from the stator of the motor 60 to the leading end of the air guiding section 45 is denoted as H2. H2 is 30% - 70% of H1, and more preferably, between 40% - 55%. H1 is 30% - 60% of H3, and more preferably, between 40% - 55%. Through this setting, when the volume of the ventilation device is of a certain height, the ratio of the air inlet area to the air outlet area can reach the best, and the ventilation efficiency is the best.

[0044] The air outlet duct 47 spirally surrounds the centrifugal impeller 80, and along the direction close to the end of the air outlet duct 47, the aperture diameter of the air outlet duct 47 gradually increases. To further avoid or reduce the air resistance at the outlet, the aperture diameter of the air outlet pipe 26 is greater than or equal to the aperture diameter at the end of the air outlet duct 47. For example, in this embodiment, the inner diameter of the air outlet pipe 26 is slightly larger than the width W1 at the end of the air outlet duct 47, and is also slightly larger than the height H4 at the end of the air outlet duct 47. In this embodiment, the height H4 at the end of the air outlet duct 47 is substantially the same as the height H3 of the volute 40. Thus, when the air flow enters the air outlet pipe 26 from the end of the air outlet duct 47, it is subjected to less resistance, thereby improving the efficiency.

[0045] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A ventilation device, comprising a volute, a motor and a centrifugal impeller; the volute includes an air inlet duct and an air outlet duct, the end of the air inlet duct is connected to the inlet of the centrifugal impeller, and the outlet of the centrifugal impeller is connected to the air outlet duct; characterized in that: The air inlet duct includes an air inlet section and a wind guiding section, the air inlet section is recessed from the front of the volute, the end of the air inlet section is connected to the head of the wind guiding section, and the end of the wind guiding section is connected to the inlet of the centrifugal impeller; the average aperture of the air inlet section is larger than the average aperture of the wind guiding section, and the aperture at the end of the air inlet section is larger than or equal to the aperture at the head of the wind guiding section; The motor drives the centrifugal impeller through a rotating shaft or a transmission member.

2. The ventilation device according to claim 1, characterized in that, The motor is located outside the head of the wind guiding section.

3. The ventilation device according to claim 1, characterized in that, Along the direction close to the centrifugal impeller, the aperture of the air inlet section remains unchanged or gradually decreases; along the direction close to the centrifugal impeller, the aperture of the wind guiding section remains unchanged or gradually decreases.

4. The ventilation device according to claim 1, characterized in that, The area of the inlet of the air inlet section accounts for 45% to 90% of the area of the front of the volute, and the center of the inlet of the air inlet section deviates from the center of the front of the volute along the direction away from the side where the end of the air outlet duct is located.

5. The ventilation device according to claim 1, characterized in that, The cross-section of the air inlet section includes one of the following: circular, elliptical, regular polygon, irregular figure; the cross-section of the wind guiding section includes one of the following: circular, elliptical, regular polygon, irregular figure.

6. The ventilation device according to claim 1, characterized in that, The distance (H2) from the motor to the head of the wind guiding section is 30% - 70% of the depth (H1) of the air inlet section.

7. The ventilation device according to claim 1, characterized in that, The depth (H1) of the air inlet section is 30% - 60% of the height (H3) of the volute.

8. The ventilation device according to claim 1, characterized in that, It further includes a motor mounting bracket for mounting the motor, the motor mounting bracket is mounted on the inner wall of the air inlet duct, and all or most of the motor mounting bracket is located outside the head of the wind guiding section.

9. The ventilation device according to claim 5, characterized in that, The motor mounting bracket includes a straight arm connecting member, the radially outer end of the straight arm connecting member is connected to the inner wall of the wind guiding section or the inner wall of the air inlet section, and the radially inner end of the straight arm connecting member mounts the motor.

10. The ventilation device according to claim 6, characterized in that, There are two straight arm connecting members, which are evenly distributed along the circumferential direction of the air inlet duct.

11. The ventilation device according to claim 1, characterized in that, It further includes an air outlet pipe connected to the end of the air outlet duct, and the aperture of the air outlet pipe is larger than or equal to the aperture at the end of the air outlet duct.

12. The ventilation device according to claim 1, characterized in that, The centrifugal impeller includes a hub portion, a connecting plate extending outward from the hub portion, and a plurality of blades connected to the connecting plate, and the plurality of blades are arranged around the hub portion; the blades are reverse streamline-shaped blades; the hub portion is sleeved on the end of the rotating shaft or the transmission member.

13. The ventilation device according to claim 1, characterized in that, The motor is a single-pole motor, including a frame-shaped yoke portion, a stator winding sleeved on the frame-shaped yoke portion, and a rotor axially passing through the yoke portion.

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