Efficient energy-saving variable-speed two-stage low-noise axial flow fan

Abstract

The utility model discloses a high-efficiency energy-saving variable-speed two-stage low-noise axial flow fan which comprises a first-stage axial flow fan module and a second-stage axial flow fan module which are arranged in a shell, and an intermediate axial flow transition structure arranged between the first-stage axial flow fan module and the second-stage axial flow fan module, the first-stage axial flow fan module comprises a first-stage impeller, and the second-stage impeller comprises a second-stage impeller. The second-stage axial flow fan module comprises a motor and a second-stage impeller, the second-stage impeller is installed on a motor shaft, the motor shaft extends towards the first-stage impeller, and a clutch is arranged between the motor shaft and a first-stage impeller shaft. An operator can adjust the speed of the motor according to actual conditions, and can lower the running speed of the motor under unnecessary conditions, so that an energy-saving effect is achieved; when the axial flow fan needs to run at a high speed, an operator increases the running speed of the motor, the clutch acts, the two-stage impeller rotates, and the axial flow fan runs efficiently.

Description

Technical Field

[0001] This utility model relates to ventilation equipment, specifically to axial flow fans. Background Technology

[0002] An axial flow fan is a type of fan in which gas flows parallel to the fan axis. It is typically used in applications requiring high flow rates but low pressure. An axial flow fan is stationary while moving air. It mainly consists of an impeller and a casing.

[0003] Patent application CN 117905712 A discloses a two-stage variable-speed, low-noise axial flow fan, comprising a primary axial flow fan module, an intermediate axial flow transition structure, and a secondary axial flow fan module installed within a housing. Both the primary and secondary axial flow fan modules include an impeller, guide vanes, and a drive module. The guide vanes are fixedly installed within the housing, and the drive module is fixedly installed on the guide vanes. The impeller is driven to rotate by a motor in the drive module, achieving rapid gas flow. The intermediate axial flow transition structure includes an outer casing and a guide vane, forming an intermediate axial flow transition channel. This channel communicates with the gas flow channels within both the primary and secondary axial flow fan modules. Both the primary and secondary modules of the axial flow fan are variable-speed, adaptable to different flow rate and pressure ranges. Utility Model Content

[0004] The technical problem solved by this utility model is to achieve energy-saving and high-efficiency effects by using a single motor to drive two-stage impellers.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a high-efficiency, energy-saving, variable-speed, two-stage, low-noise axial flow fan, including a primary axial flow fan module and a secondary axial flow fan module disposed in the housing, and an intermediate axial flow transition structure disposed between the primary axial flow fan module and the secondary axial flow fan module. The primary axial flow fan module includes a primary impeller, and the secondary axial flow fan module includes a motor and a secondary impeller. The secondary impeller is mounted on the motor shaft, and the motor shaft extends in the direction of the primary impeller. A clutch is provided between the motor shaft and the primary impeller shaft, and the clutch is an automatic centrifugal clutch.

[0006] According to the above technical solution, the motor rotates, driving the secondary impeller to rotate, thus operating the axial flow fan. The motor speed is adjustable. When the motor runs at high speed, the clutch engages, connecting the motor shaft to the primary impeller shaft. The motor then drives the primary impeller to rotate, thus causing the primary and secondary impellers to rotate synchronously, increasing the power of the axial flow fan.

[0007] According to the above technical solution, one motor drives two-stage impellers, which, compared to the existing technology where each impeller stage is equipped with a separate motor, achieves energy savings. Furthermore, the motor speed is adjustable; at low speeds, only the second-stage impeller rotates; at high speeds, the clutch engages, causing both impeller stages to rotate. Thus, the axial flow fan of this application can operate at low power when not requiring high power, and at high power when needed, achieving energy efficiency and high performance.

[0008] The clutch includes a male clutch component fixedly connected to the motor shaft and a female clutch component fixedly connected to the first-stage impeller shaft. The male clutch component is pivotally connected to the female clutch component, and a clutch module is movably fitted within the male clutch component. The inner wall of the female clutch component has a toothed structure, and the clutch module, which displaces radially along the male clutch component, can engage with the toothed structure. When the motor runs at high speed, the clutch module displaces radially, protruding from the male clutch component and engaging with the toothed structure of the female clutch component. In this way, the motor shaft drives the first-stage impeller shaft to rotate through the clutch, and the first-stage impeller rotates accordingly.

[0009] The male clutch component is pivotally connected to the female clutch component via a bearing.

[0010] The clutch male component is fixedly connected to the motor shaft via the first flange, and the clutch female component is fixedly connected to the first-stage impeller shaft via the second flange.

[0011] The clutch male component includes a left half and a right half. The left half has a left half chamber, and the right half has a right half chamber. The left and right halves are fixedly connected and assembled to form the clutch module chamber. The clutch module is movably fitted within the clutch module chamber. A spring is installed inside the clutch module chamber, abutting against the clutch module and limiting the radial protrusion of the clutch module from the clutch male component. When the motor is running at low speed, the clutch module is located within the clutch module chamber under the action of the spring. When the motor is running at high speed, the clutch module overcomes the spring force, displaces radially, protrudes from the clutch male component, and engages with the toothed structure of the clutch female component. In this way, the motor shaft drives the first-stage impeller shaft to rotate through the clutch, and the first-stage impeller rotates accordingly.

[0012] The clutch module includes a small-diameter section and a large-diameter section. The small-diameter section fits into the small cavity of the clutch module chamber, and the large-diameter section fits into the large cavity of the clutch module chamber. The spring is located in the large cavity of the clutch module chamber.

[0013] The left and right halves of the male component are fixedly connected by threaded connectors.

[0014] The primary axial flow fan module includes a primary guide vane, which is welded to the inner ring of the primary guide vane. An outer ring of the primary guide vane is welded to the periphery of the primary guide vane, and the outer ring is fixedly mounted on the side wall of the outer casing. A primary impeller shaft support is located inside the inner ring of the primary guide vane, and the primary impeller shaft is pivotally connected to the support. The primary axial flow fan module also includes a primary flow guide shroud, located in front of the primary impeller, and fixedly mounted on the side wall of the outer casing. The outer ring of the primary guide vane is fixedly mounted on the side wall of the outer casing via a threaded connector.

[0015] The two-stage axial flow fan module includes two-stage guide vanes, which are welded to the inner ring of the two-stage guide vanes. An outer ring of the two-stage guide vanes is welded to the periphery of the two-stage guide vanes and is fixedly mounted on the side wall of the outer casing. The motor is fixedly mounted within the inner ring of the two-stage guide vanes. The two-stage axial flow fan module also includes a two-stage flow guide shroud, located in front of the two-stage impeller and fixedly mounted on the side wall of the outer casing. The outer ring of the two-stage guide vanes is fixedly mounted on the side wall of the outer casing via threaded connectors. The motor can also be fixedly mounted within the inner ring of the two-stage guide vanes via threaded connectors.

[0016] The intermediate axial flow transition structure includes an outer guide shroud and an inner guide shroud. The outer guide shroud is fixedly installed on the side wall of the outer casing, and the inner guide shroud is fixedly installed on the inner ring of the first-stage guide vane. The motor shaft passes through the inner guide shroud, which is provided with a pivot seat. The motor shaft is pivotally connected to the pivot seat, and the clutch is located within the inner guide shroud. The inner guide shroud shields the clutch from noise during operation, thus reducing the operating noise of the axial flow fan.

[0017] This utility model has the following technical effects:

[0018] First, one motor drives two stages of impellers, which is more energy-efficient than the existing technology where each impeller stage is equipped with a separate motor.

[0019] Secondly, the speed of the motor itself is adjustable. The operator can adjust the speed of the motor according to the actual situation. In cases where it is not necessary, the motor speed can be reduced to achieve energy saving.

[0020] Third, when the axial flow fan needs to run at high speed, the operator increases the motor speed, the clutch engages, the two-stage impeller rotates, and the axial flow fan runs efficiently.

[0021] Fourth, this application uses a single motor to drive a two-stage impeller. The reduction in the number of motors can reduce the operating noise of the axial flow fan. Moreover, the clutch is located in the inner guide casing, which further reduces the operating noise of the axial flow fan. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings:

[0023] Figure 1 A schematic diagram of a high-efficiency, energy-saving, variable-speed, two-stage, low-noise axial flow fan;

[0024] Figure 2 for Figure 1 Schematic diagram of clutch 50;

[0025] Figure 3 This is an external view of clutch 50;

[0026] Figure 4 This is a 3D view of clutch 50;

[0027] Figure 5 for Figure 4 Exploded view.

[0028] Explanation of symbols in the diagram:

[0029] 10. Outer casing;

[0030] 20. First-stage axial flow fan module; 21. First-stage impeller; 210. First-stage impeller shaft; 22. First-stage guide vane; 23. Inner ring of first-stage guide vane; 24. Outer ring of first-stage guide vane; 25. First-stage impeller shaft support; 26. First-stage guide shroud;

[0031] 30. Secondary axial flow fan module; 31. Motor; 310. Motor shaft; 32. Secondary impeller; 33. Secondary guide vane; 34. Inner ring of secondary guide vane; 35. Outer ring of secondary guide vane; 36. Secondary flow guide shroud;

[0032] 40. Intermediate axial flow transition structure; 41. Outer flow guide cover; 42. Inner flow guide cover; 420. Pivot seat;

[0033] 50. Clutch; 51. Clutch male component; 511. First flange; 512. Left half male component; 513. Right half male component; 514. Left half chamber; 52. Clutch female component; 521. Tooth structure; 522. Second flange; 53. Clutch module; 531. Small diameter section; 532. Large diameter section; 54. Bearing; 55. Spring. Detailed Implementation

[0034] like Figure 1 The high-efficiency, energy-saving, variable-speed, two-stage low-noise axial flow fan includes a primary axial flow fan module 20 and a secondary axial flow fan module 30 disposed in the housing 10, and an intermediate axial flow transition structure 40 disposed between the primary and secondary axial flow fan modules. The primary axial flow fan module includes a primary impeller 21, and the secondary axial flow fan module includes a motor 31 and a secondary impeller 32. The secondary impeller is mounted on the motor shaft 310, and the motor shaft extends in the direction of the primary impeller. A clutch 50 is disposed between the motor shaft and the primary impeller shaft 210. This clutch is an automatic centrifugal clutch.

[0035] like Figure 2 , Figure 5 The clutch 50 includes a male clutch component 51 fixedly connected to the motor shaft 310 and a female clutch component 52 fixedly connected to the first-stage impeller shaft 210. The male clutch component is pivotally connected to the female clutch component, and a clutch module 53 is movably fitted in the male clutch component. The inner wall of the female clutch component is provided with a toothed structure 521, and the clutch module, which is radially displaced along the male clutch component, can cooperate with the toothed structure.

[0036] The clutch male component 51 is pivotally connected to the clutch female component 52 via a bearing 54.

[0037] The clutch male component 51 is fixedly connected to the motor shaft 310 via the first flange 511, and the clutch female component 52 is fixedly connected to the first stage impeller shaft 210 via the second flange 522.

[0038] like Figure 2 The clutch component 51 includes a left half component 512 and a right half component 513. The left half component has a left half chamber 514, and the right half component has a right half chamber. The left half component and the right half component are fixedly connected. The left half chamber and the right half chamber are assembled to form a clutch module chamber. The clutch module 53 is movably fitted in the clutch module chamber. A spring 55 is provided in the clutch module chamber. The spring abuts against the clutch module and restricts the clutch module from radially protruding from the clutch component 51.

[0039] The clutch module 53 includes a small diameter section 531 and a large diameter section 532. The small diameter section fits in the small cavity of the clutch module chamber, and the large diameter section fits in the large cavity of the clutch module chamber. The spring 55 is located in the large cavity of the clutch module chamber.

[0040] The left half male part 512 and the right half male part 513 are fixedly connected by a threaded connector.

[0041] like Figure 1 The primary axial flow fan module 20 includes a primary guide vane 22, which is welded to the inner ring 23 of the primary guide vane. An outer ring 24 of the primary guide vane is welded to the periphery of the primary guide vane and is fixedly mounted on the side wall of the housing 10. A primary impeller shaft support 25 is provided inside the inner ring of the primary guide vane, and the primary impeller shaft 210 is pivotally connected to the primary impeller shaft support. The primary axial flow fan module 20 also includes a primary flow guide shroud 26, which is located in front of the primary impeller 21 and is fixedly mounted on the side wall of the housing 10.

[0042] like Figure 1The secondary axial flow fan module 30 includes a secondary guide vane 33, which is welded to the inner ring 34 of the secondary guide vane. An outer ring 35 of the secondary guide vane is welded to the periphery of the secondary guide vane, and the outer ring is fixedly installed on the side wall of the housing 10. A motor 31 is fixedly installed within the inner ring of the secondary guide vane. The secondary axial flow fan module 30 also includes a secondary flow guide shroud 36, which is located in front of the secondary impeller 32 and is fixedly installed on the side wall of the housing 10.

[0043] The intermediate axial flow transition structure 40 includes an outer guide cover 41 and an inner guide cover 42. The outer guide cover is fixedly installed on the side wall of the outer shell 10, and the inner guide cover is fixedly installed on the inner ring 23 of the first-stage guide vane. The motor shaft 310 passes through the inner guide cover, and the inner guide cover is provided with a pivot seat 420. The motor shaft is pivotally connected to the pivot seat, and the clutch 50 is located in the inner guide cover.

[0044] The rotation of motor 31 drives the rotation of the secondary impeller 32, thus operating the axial flow fan. The speed of motor 31 is adjustable. When motor 31 is running at high speed, clutch 50 is engaged, connecting motor shaft 310 and primary impeller shaft 210. Motor 31 drives primary impeller 21 to rotate. In this way, the primary impeller and secondary impeller 32 rotate synchronously, increasing the power of the axial flow fan.

[0045] When the motor 31 is running at low speed, the clutch module 53 is located in the clutch module chamber under the action of the spring 55. When the motor is running at high speed, the clutch module 53 overcomes the elastic force of the spring 55, displaces radially, protrudes the clutch male part 51, and engages with the tooth structure 521 of the clutch female part. In this way, the motor shaft 310 drives the first-stage impeller shaft 210 to rotate through the clutch 50, and the first-stage impeller 21 rotates accordingly.

[0046] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A high-efficiency, energy-saving, variable-speed, two-stage low-noise axial flow fan, comprising a primary axial flow fan module (20) and a secondary axial flow fan module (30) disposed in a housing (10), and an intermediate axial flow transition structure (40) disposed between the primary axial flow fan module and the secondary axial flow fan module, wherein the primary axial flow fan module comprises a primary impeller (21), and the secondary axial flow fan module comprises a motor (31) and a secondary impeller (32), the secondary impeller being mounted on the motor shaft (310), characterized in that: The motor shaft extends in the direction of the first-stage impeller, and a clutch (50) is provided between the motor shaft and the first-stage impeller shaft (210). This clutch is an automatic centrifugal clutch.

2. The high-efficiency, energy-saving, variable-speed, two-stage low-noise axial flow fan as described in claim 1, characterized in that: The clutch (50) includes a clutch male component (51) fixedly connected to the motor shaft (310) and a clutch female component (52) fixedly connected to the first-stage impeller shaft (210). The clutch male component is pivotally connected to the clutch female component. A clutch module (53) is movably fitted in the clutch male component. A toothed structure (521) is provided on the inner wall of the clutch female component. The clutch module, which is radially displaced along the clutch male component, can cooperate with the toothed structure.

3. The high-efficiency, energy-saving, variable-speed, two-stage low-noise axial flow fan as described in claim 2, characterized in that: The clutch male component (51) is pivotally connected to the clutch female component (52) via a bearing (54).

4. The high-efficiency, energy-saving, variable-speed, two-stage low-noise axial flow fan as described in claim 2, characterized in that: The clutch male component (51) is fixedly connected to the motor shaft (310) via the first flange (511), and the clutch female component (52) is fixedly connected to the first stage impeller shaft (210) via the second flange (522).

5. The high-efficiency, energy-saving, variable-speed, two-stage low-noise axial flow fan as described in claim 2, characterized in that: The clutch component (51) includes a left half component (512) and a right half component (513). The left half component has a left half chamber (514), and the right half component has a right half chamber. The left half component and the right half component are fixedly connected. The left half chamber and the right half chamber are assembled to form a clutch module chamber. The clutch module (53) is movably fitted in the clutch module chamber. A spring (55) is provided in the clutch module chamber. The spring abuts against the clutch module and restricts the clutch module from radially protruding from the clutch component (51).

6. The high-efficiency, energy-saving, variable-speed, two-stage low-noise axial flow fan as described in claim 5, characterized in that: The clutch module (53) includes a small diameter section (531) and a large diameter section (532). The small diameter section fits in the small cavity of the clutch module chamber, and the large diameter section fits in the large cavity of the clutch module chamber. The spring (55) is located in the large cavity of the clutch module chamber.

7. The high-efficiency, energy-saving, variable-speed, two-stage low-noise axial flow fan as described in claim 5, characterized in that: The left half male part (512) and the right half male part (513) are fixedly connected by a threaded connector.

8. The high-efficiency, energy-saving, variable-speed, two-stage low-noise axial flow fan as described in claim 1, characterized in that: The primary axial flow fan module (20) includes a primary guide vane (22), which is welded to the inner ring (23) of the primary guide vane. The outer ring (24) of the primary guide vane is welded to the periphery of the primary guide vane. The outer ring of the primary guide vane is fixedly installed on the side wall of the outer casing (10). The inner ring of the primary guide vane is provided with a primary impeller shaft support (25), and the primary impeller shaft (210) is pivotally connected to the primary impeller shaft support. The primary axial flow fan module (20) includes a primary flow guide shroud (26), which is located in front of the primary impeller (21) and is fixedly installed on the side wall of the housing (10).

9. The high-efficiency, energy-saving, variable-speed, two-stage low-noise axial flow fan as described in claim 8, characterized in that: The secondary axial flow fan module (30) includes a secondary guide vane (33), which is welded to the inner ring (34) of the secondary guide vane. The outer ring (35) of the secondary guide vane is welded to the periphery of the secondary guide vane and is fixedly installed on the side wall of the outer casing (10). The motor (31) is fixedly installed in the inner ring of the secondary guide vane. The secondary axial flow fan module (30) includes a secondary guide shroud (36), which is located in front of the secondary impeller (32) and is fixedly installed on the side wall of the housing (10).

10. The high-efficiency, energy-saving, variable-speed, two-stage low-noise axial flow fan as described in claim 9, characterized in that: The intermediate axial flow transition structure (40) includes an outer guide cover (41) and an inner guide cover (42). The outer guide cover is fixedly installed on the side wall of the outer shell (10), and the inner guide cover is fixedly installed on the inner ring (23) of the first-stage guide vane. The motor shaft (310) passes through the inner guide cover, and the inner guide cover is provided with a pivot seat (420). The motor shaft is pivotally connected to the pivot seat, and the clutch (50) is located in the inner guide cover.

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