A fan vortex casing

Abstract

The present application relates to the technical field of fans, and in particular to a fan volute, which includes a driving module and a volute, wherein an impeller is rotatably arranged in the volute, an axial hole is provided on the side wall of the volute, a sealing box is provided on one side of the volute, a through hole is provided on one side of the sealing box, an impeller shaft is provided at the output end of the driving module, one end of the impeller shaft passes through the through hole and the axial hole in sequence, one end of the impeller shaft is coaxially connected with the impeller, an air pipe is provided on the side wall of the sealing box, one end of the air pipe is provided with a compressed air source, and a ball valve and a pressure reducing valve are provided on the air pipe in sequence. The present application has the effect of reducing the leakage of odor and improving the internal working environment of the workshop.

Description

Technical Field

[0001] The present application relates to the technical field of fans, and in particular to a fan volute. Background Art

[0002] In the storage system of the waste incineration plant, the newly-input waste needs to be fermented in the storage pit for 5-7 days before incineration to ensure that its calorific value meets the incineration efficiency requirements. A large amount of odor will be generated during the fermentation process. During the incineration process, a primary fan is used to extract the odor into the incinerator for incineration, so as to prevent the odor in the waste pit from overflowing and control the emission of unorganized odor.

[0003] The current primary fan is a general-purpose fan, which includes a base, a volute is provided on one side of the base, the volute is provided with an air inlet and an air outlet, and an impeller is rotatably installed in the volute. A motor is provided on the top surface of the base away from the volute, and the drive shaft of the motor is coaxially connected with a coupling, and the output end of the coupling is fixedly connected with an impeller shaft, the impeller shaft extends into the volute, and the impeller shaft is coaxially fixedly connected with the impeller. When the motor is started, the motor drives the impeller to rotate through the coupling. Under the rotation of the impeller, the exhaust air in the incineration plant is sucked from the air inlet into the volute, and then drawn out from the air outlet into the incinerator, completing the emission and incineration of the odor.

[0004] However, due to the gap between the impeller shaft and the volute, odor can easily leak into the incineration workshop through the gap, thereby polluting the internal environment of the workshop. Summary of the invention

[0005] In order to reduce the leakage of odor and improve the internal working environment of the workshop, the present application provides a fan volute.

[0006] The present application provides a fan vortex casing, which adopts the following technical solution:

[0007] A fan volute comprises a drive module and a volute, an impeller is rotatably arranged in the volute, an axial hole is provided in the side wall of the volute, a sealing box is provided on one side of the volute, a through hole is provided on one side of the sealing box, an impeller shaft is provided on the output end of the drive module, one end of the impeller shaft passes through the through hole and the axial hole in sequence, one end of the impeller shaft is coaxially connected to the impeller, an air pipe is connected to the side wall of the sealing box, one end of the air pipe is connected to a compressed air source, and a ball valve and a pressure reducing valve are connected to the air pipe in sequence.

[0008] By adopting the above technical solution, when the fan is used, the drive module and the compressed air source are started, the drive module drives the impeller shaft to rotate, and the impeller shaft drives the impeller to rotate, so that the odor in the garbage is sucked into the volute, and when the ball valve is opened, the compressed air is injected into the sealing box after being reduced in pressure by the pressure reducing valve. The compressed air forms a positive pressure wind-tight chamber in the sealing box, thereby preventing the odor from seeping out from the gap between the impeller shaft and the wall of the shaft hole, which is beneficial to improving the internal working environment of the workshop.

[0009] Optionally, a bracket is provided on one side of the volute, the sealing box is provided in the bracket, the bracket is provided with a first adjusting component for driving the sealing box to move along the Y-axis direction, and the bracket is provided with a second adjusting component for driving the sealing box to move along the X-axis direction.

[0010] By adopting the above technical solution, the position of the sealing box on one side of the volute is adjusted by the first adjusting component and the second adjusting component respectively, so that the impeller shaft passes through the sealing box in the center, thereby overcoming the installation error, reducing the resistance to the rotation of the impeller shaft, and also reducing the compressed air in the sealing box from overflowing from the gap between the impeller shaft and the perforated hole wall.

[0011] Optionally, the first adjustment component includes a first gear, an adjustment seat is provided on one side of the sealing box, a rack is provided on the inner wall of the adjustment seat, the first gear is rotatably provided on the inner side of the adjustment seat, the first gear is meshed with the rack, and the bracket is provided with a rotating part for driving the first gear to rotate.

[0012] By adopting the above technical solution, when it is necessary to adjust the position of the sealing box in the Y-axis direction, the first gear is driven to rotate through the rotating member, and the first gear drives the adjustment seat to move in the Y-axis direction through the rack. The adjustment seat thereby drives the sealing box to adjust and move in the Y-axis direction, which is beneficial to improve the stability of the sealing box in the Y-axis direction.

[0013] Optionally, the second adjustment assembly includes a screw rod and a guide rod, the screw rod is rotatably arranged in the bracket, the side wall thread sleeve of the screw rod is provided with a threaded block, the threaded block is slidably connected to one side of the adjustment seat, the guide rod is arranged in the bracket, the side wall sliding sleeve of the guide rod is provided with a sliding block, and the sliding block is slidably connected to one side of the adjustment seat.

[0014] By adopting the above technical solution, when it is necessary to adjust the position of the sealing box in the X-axis direction, the lead screw is driven to rotate, and under the guiding action of the guide rod, the lead screw drives the threaded block to move along the X-axis direction, and the threaded block drives the adjustment seat to move along the X-axis direction, and the adjustment seat thereby drives the sealing box to adjust and move in the X-axis direction, which is beneficial to improve the stability of the sealing box in the X-axis direction.

[0015] Optionally, the rotating member is a first knob, a rotating frame is provided on the inner side of the threaded block, a rotating shaft is coaxially provided on one side of the first knob, one end of the rotating shaft rotates and passes through the rotating frame, and one end of the rotating shaft is coaxially connected to the first gear.

[0016] By adopting the above technical solution, when the first knob is driven to rotate, the first knob drives the first gear to rotate through the rotating shaft, and the first gear finally drives the sealing box to adjust and move along the Y-axis direction, which is beneficial to improve the stability of the rotation of the first gear.

[0017] Optionally, the bracket includes a fixing portion and an extending portion, the fixing portion is arranged on one side of the volute, one end of the extending portion extends and is slidably arranged in the fixing portion, and the fixing portion is provided with a fixing component for fixing the extending portion.

[0018] By adopting the above technical solution, when the sealing box needs to be moved close to the volute casing, the extension part is driven to move in the direction close to the volute casing, and the extension part finally drives the sealing box to move in the direction close to the volute casing, and finally the position of the extension part is locked by the fixing component. At this time, the position of the sealing box in the Z-axis direction is locked, which is beneficial to improve the stability of the sealing box against one side of the volute casing.

[0019] Optionally, the fixing assembly includes a locking rod, an auxiliary frame is provided on the side wall of the fixing part, the locking rod is slidably connected to the auxiliary frame, one end of the locking rod extends into the fixing part, a plurality of locking holes are provided on the side wall of the extending part, one end of the locking rod is respectively plugged into the plurality of locking holes, and the auxiliary frame is provided with an elastic member for cooperating with the movement of the locking rod.

[0020] By adopting the above technical solution, when it is necessary to move and adjust the position of the sealing box in the Z-axis direction, the locking rod is driven to move in the direction away from the extension part, and then the extension part is driven to slide in the fixed part. The extension part finally drives the sealing box to move and adjust along the Z-axis direction. When the position adjustment of the sealing box is completed, the locking rod is driven to move in the direction close to the extension part until the locking rod is inserted into the locking hole. At this time, the extension part is fixed in the fixed part, and the sealing box is fixed in the current position, which is beneficial to improve the stability of the sealing box in the Z-axis direction.

[0021] Optionally, the elastic member is a spring, which is sleeved on the locking rod, one end of the spring is fixedly connected to the side wall of the locking rod, and the other end of the spring is fixedly connected to the inner wall of the auxiliary frame.

[0022] By adopting the above technical solution, when the locking rod is driven to move in a direction away from the extension part, the locking rod squeezes the spring, and the extension part is released from the restriction and slides in the fixed part. When the locking rod is released, the spring releases the elastic force and drives the locking rod to move in a direction close to the extension part. At this time, the locking rod is inserted into the lock hole, and the extension part and the fixed part are relatively fixed, which is beneficial to improve the stability of the fixed position of the sealing box.

[0023] Optionally, a sealing soft ring is provided on the side of the sealing box facing the volute, and an air passage is opened on the box wall of the sealing box, one end of the air passage is connected to the air pipe, and the other end of the air passage is connected to the sealing soft ring.

[0024] By adopting the above technical solution, when the compressed air source is started, part of the gas flows into the airway, and then is squeezed through the airway toward the sealing soft ring. Under the action of air pressure, the sealing soft ring is pressed against the outer wall of the volute, which is beneficial to improve the sealing between the sealing box and the volute.

[0025] Optionally, the gap between the impeller shaft and the perforated hole wall is controlled within 1.5 mm.

[0026] By adopting the above technical solution, the 1.5 mm gap is helpful to improve the sealing performance of the sealing box and reduce the leakage of compressed air from between the impeller shaft and the perforated hole wall.

[0027] In summary, this application includes the following beneficial technical effects:

[0028] When the fan is used, the drive module and the compressed air source are started. The drive module drives the impeller shaft to rotate, and the impeller shaft drives the impeller to rotate, so that the odor in the garbage is sucked into the volute. After the ball valve is opened, the compressed air is injected into the sealing box after being reduced in pressure by the pressure reducing valve. The compressed air forms a positive pressure wind-tight chamber in the sealing box, thereby preventing the odor from seeping out from the gap between the impeller shaft and the wall of the shaft hole, which is beneficial to improving the working environment inside the workshop. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a first overall structural schematic diagram of the fan volute of the present application;

[0030] Figure 2 is a second overall structural schematic diagram of the fan volute of the present application;

[0031] Figure 3 It is a schematic diagram of the connection between the volute and the impeller shaft of the present application;

[0032] Figure 4 is a schematic diagram of the connection between the bracket and the sealing box of the present application;

[0033] Figure 5 yes Figure 4An enlarged view of part A;

[0034] Figure 6 yes Figure 4 An enlarged view of part B;

[0035] Figure 7 A cross-sectional view of the sealed box of the present application.

[0036] Explanation of the accompanying drawings: 1. drive module; 2. volute; 3. impeller; 4. shaft hole; 5. sealing box; 6. perforation; 7. motor; 8. coupling; 9. impeller shaft; 10. air pipe; 11. ball valve; 12. pressure reducing valve; 13. bracket; 14. first gear; 15. adjustment seat; 16. rack; 17. first knob; 18. swing frame; 19. swing shaft; 20. screw rod; 21. guide rod; 22. threaded block; 23. sliding block; 24. second knob; 25. fixing part; 26. extension part; 27. locking rod; 28. auxiliary frame; 29. ​​locking hole; 30. spring; 31. sealing soft ring; 32. airway. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-7 This application is described in further detail.

[0038] See also Figure 1-Figure 4 A fan volute comprises a driving module 1 and a volute 2, wherein an impeller 3 is rotatably mounted in the volute 2, and an axial hole 4 is provided on the side wall of the volute 2. The driving module 1 is arranged opposite to the volute 2, and a sealing box 5 is installed between the driving module 1 and the volute 2, and a through hole 6 is penetrated on the side of the sealing box 5 away from the volute 2. The driving module 1 comprises a motor 7 and a coupling 8, wherein the driving shaft of the motor 7 is coaxially fixedly connected to the input end of the coupling 8, and an impeller shaft 9 is coaxially fixedly connected to the output end of the coupling 8. One end of the impeller shaft 9 penetrates the through hole 6 and the axial hole 4 in sequence, and one end of the impeller shaft 9 is coaxially fixedly connected to the impeller 3. An air pipe 10 is fixedly connected to the side wall of the sealing box 5, and a compressed air source is fixedly connected to the end of the air pipe 10 away from the sealing box 5, and a ball valve 11 and a pressure reducing valve 12 are also fixedly connected to the air pipe 10 in sequence.

[0039] When the fan is used, the motor 7 and the compressed air source are started, and the driving shaft of the motor 7 drives the impeller shaft 9 to rotate through the coupling 8, and the impeller shaft 9 drives the impeller 3 to rotate. Under the rotation of the impeller 3, the odor in the garbage in the incinerator is sucked into the volute 2. When the ball valve 11 is opened, the compressed air is injected into the sealing box 5 after the pressure is reduced by the pressure reducing valve 12, and a positive pressure wind-tight chamber is formed in the sealing box 5, thereby preventing the odor from leaking out from the gap between the impeller shaft 9 and the wall of the shaft hole 4.

[0040] For details, see Figure 2 and Figure 4The side wall of the volute 2 is fixedly connected with a bracket 13, and the sealing box 5 is installed in the bracket 13. The bracket 13 is respectively installed with a first adjustment component and a second adjustment component, the first adjustment component is used to drive the sealing box 5 to move and adjust along the Y axis direction, and the second adjustment component is used to drive the sealing box 5 to move and adjust along the X axis direction.

[0041] For details, see Figure 4 and Figure 5 The first adjustment assembly includes a first gear 14. An adjustment seat 15 is fixedly connected to the side of the sealing box 5 facing away from the volute 2, and a rack 16 is fixedly connected to the inner wall of the adjustment seat 15. The first gear 14 is rotatably mounted on the inner side of the adjustment seat 15, and the first gear 14 is meshed with the rack 16.

[0042] In addition, in order to facilitate the rotation of the first gear 14, the bracket 13 is also equipped with a rotating member, which is a first knob 17. The inner side of the threaded block 22 is fixedly connected to a rotating frame 18, one end of the first knob 17 is coaxially fixedly connected to a rotating shaft 19, one end of the rotating shaft 19 rotates and passes through the rotating frame 18, and one end of the rotating shaft 19 is coaxially fixedly connected to the first gear 14.

[0043] For details, see Figure 4 The second adjustment assembly includes a screw rod 20 and a guide rod 21. The screw rod 20 is rotatably installed in the bracket 13, and a threaded block 22 is provided on the side wall of the screw rod 20, and the threaded block 22 is slidably connected with the adjustment seat 15 in the Y-axis direction. The guide rod 21 is fixedly installed in the bracket 13, and a sliding block 23 is provided on the side wall of the guide rod 21, and the sliding block 23 is also slidably connected with the adjustment seat 15 in the Y-axis direction.

[0044] When the position of the sealing box 5 in the Y-axis direction needs to be adjusted, the first gear 14 is driven to rotate by the rotating member, and the first gear 14 drives the adjustment seat 15 to move in the Y-axis direction through the rack 16, and the adjustment seat 15 thereby drives the sealing box 5 to adjust and move in the Y-axis direction.

[0045] When it is necessary to adjust the position of the sealing box 5 in the X-axis direction, the screw rod 20 is driven to rotate. Under the guidance of the guide rod 21, the screw rod 20 drives the threaded block 22 to move along the X-axis direction, and the threaded block 22 drives the adjustment seat 15 to move along the X-axis direction. The adjustment seat 15 thereby drives the sealing box 5 to adjust and move in the X-axis direction.

[0046] The position of the sealing box 5 on one side of the volute 2 is adjusted by the first adjusting component and the second adjusting component respectively, so that the impeller shaft 9 passes through the sealing box 5 in the center, overcomes the installation error, reduces the resistance to the rotation of the impeller shaft 9, and also reduces the compressed air in the sealing box 5 from overflowing from the gap between the impeller shaft 9 and the wall of the through hole 6.

[0047] It is worth noting that see Figure 4One end of the screw rod 20 extends outside the bracket 13 , and one end of the screw rod 20 is coaxially fixedly connected to a second knob 24 .

[0048] The second knob 24 drives the screw rod 20 to rotate, thereby improving the convenience of the final movement and adjustment of the sealing box 5 in the X-axis direction.

[0049] See also Figure 4 and Figure 6 In order to facilitate the movement of the sealing box 5 in the Z-axis direction, the bracket 13 includes a fixing portion 25 and an extending portion 26. The fixing portion 25 is fixedly connected to the outer wall of the volute 2. One end of the extending portion 26 is fixedly connected to the adjustment seat 15, and the other end of the extending portion 26 extends into the fixing portion 25, and one end of the extending portion 26 is slidably connected to the fixing portion 25.

[0050] In addition, the fixing portion 25 is also equipped with a fixing assembly, which is used to fix the position of the extension portion 26. The fixing assembly includes a locking rod 27. The side wall of the fixing portion 25 is fixedly connected to an auxiliary frame 28, and the locking rod 27 slides through the auxiliary frame 28. The side wall of the extension portion 26 is provided with a locking hole 29, and the number of the locking holes 29 is provided. The multiple locking holes 29 are respectively opened along the length direction of the extension portion 26. One end of the locking rod 27 penetrates the fixing portion 25, and one end of the locking rod 27 is respectively plugged into the multiple locking holes 29.

[0051] At the same time, the auxiliary frame 28 is also equipped with an elastic member, which is used to cooperate with the lock rod 27 to move. The elastic member is a spring 30, which is sleeved on the lock rod 27, one end of the spring 30 is fixedly connected to the side wall of the lock rod 27, and the other end of the spring 30 is fixedly connected to the inner wall of the auxiliary frame 28.

[0052] When the locking rod 27 is pulled in a direction away from the fixing portion 25, the locking rod 27 squeezes the spring 30, and the locking rod 27 is separated from the locking hole 29. At this time, the extension portion 26 is released from the restriction, and the sealing box 5 is moved and adjusted according to the use requirements. When the sealing box 5 needs to be assembled, the sealing box 5 is moved in a direction close to the fixing portion 25 so that the sealing box 5 is pressed against the side wall of the volute 2. Then, the locking rod 27 is released, the spring 30 releases the elastic force, and the locking rod 27 is moved in a direction close to the fixing portion 25. At this time, the locking rod 27 is inserted into one of the locking holes 29, the extension portion 26 is fixed in the fixing portion 25, and the sealing box 5 is pressed against the outer wall of the volute 2.

[0053] It is worth noting that see Figure 4 and Figure 7 In order to improve the sealing performance between the sealing box 5 and the volute 2 and reduce the leakage of compressed air from the connection between the sealing box 5 and the volute 2, a sealing soft ring 31 is fixedly installed on the side of the sealing box 5 facing the volute 2. An air passage 32 is opened in the box wall of the sealing box 5, and one end of the air passage 32 is connected to the air pipe 10, and the other end of the air passage 32 is connected to the sealing soft ring 31.

[0054] When compressed air flows in from the air pipe 10, part of the compressed air flows into the air passage 32, and then the compressed air flows through the air passage 32 toward the sealing soft ring 31. At this time, the sealing soft ring 31 is pressed against the outer wall of the volute 2, thereby further improving the sealing between the sealing box 5 and the volute 2.

[0055] It is worth mentioning that after the position adjustment of the sealing box 5 is completed, the gap between the impeller shaft 9 and the hole wall of the perforation 6 is controlled within 1.5 mm. The 1.5 mm gap is conducive to improving the sealing performance of the sealing box 5 and reducing the leakage of compressed air from the impeller shaft 9 and the hole wall of the perforation 6.

[0056] Working principle of a fan vortex casing:

[0057] When the sealing box 5 needs to be installed, the position of the sealing box 5 in the X-axis direction is first corrected. To this end, the screw rod 20 is driven to rotate, and under the guidance of the guide rod 21, the screw rod 20 drives the threaded block 22 to move along the X-axis direction, and the threaded block 22 drives the adjustment seat 15 to move along the X-axis direction, thereby driving the sealing box 5 to adjust and move in the X-axis direction.

[0058] Then the position of the sealing box 5 in the Y-axis direction is corrected. To this end, the first gear 14 is driven to rotate by the rotating member, and the first gear 14 drives the adjustment seat 15 to move in the Y-axis direction through the rack 16, and the adjustment seat 15 drives the sealing box 5 to adjust and move in the Y-axis direction.

[0059] After the position calibration of the sealing box 5 is completed, the gap between the impeller shaft 9 and the wall of the through hole 6 is 1.5 mm.

[0060] Then, when the locking rod 27 is pulled in a direction away from the fixing portion 25, the locking rod 27 squeezes the spring 30, and the locking rod 27 is separated from the locking hole 29. At this time, the extension portion 26 is released from the restriction, and then the sealing box 5 is driven to move in a direction close to the outer wall of the volute 2 until the sealing box 5 abuts against the outer wall of the volute 2. Then, the locking rod 27 is released, the spring 30 releases the elastic force, and drives the locking rod 27 to move in a direction close to the fixing portion 25. At this time, the locking rod 27 is inserted into one of the locking holes 29, and the sealing box 5 is fixed at the current position, completing the position correction and installation of the sealing box 5.

[0061] When the fan is used, the motor 7 and the compressed air source are started, and the driving shaft of the motor 7 drives the impeller shaft 9 to rotate through the coupling 8, and the impeller shaft 9 drives the impeller 3 to rotate. Under the rotation of the impeller 3, the odor in the garbage in the incinerator is sucked into the volute 2. When the ball valve 11 is opened, the compressed air is injected into the sealing box 5 after the pressure is reduced by the pressure reducing valve 12, and a positive pressure wind-tight chamber is formed in the sealing box 5, thereby preventing the odor from leaking out from the gap between the impeller shaft 9 and the wall of the shaft hole 4.

[0062] It should be noted that when the compressed air source is started, part of the compressed air flows into the air passage 32, and then the compressed air flows through the air passage 32 toward the sealing soft ring 31. At this time, the sealing soft ring 31 is pressed against the outer wall of the volute 2, thereby further improving the sealing between the sealing box 5 and the volute 2.

[0063] In summary, a positive pressure airtight chamber is formed in the sealing box 5 by compressed air, thereby preventing odor from leaking out from the gap between the impeller shaft 9 and the wall of the shaft hole 4, which is beneficial to improving the working environment inside the workshop.

[0064] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fan volute, comprising a drive module (1) and a volute (2), wherein an impeller (3) is rotatably arranged in the volute (2), characterized in that: The side wall of the volute (2) is provided with an axial hole (4), a sealing box (5) is provided on one side of the volute (2), a through hole (6) is provided on one side of the sealing box (5), an impeller shaft (9) is provided at the output end of the drive module (1), one end of the impeller shaft (9) passes through the through hole (6) and the axial hole (4) in sequence, one end of the impeller shaft (9) is coaxially connected to the impeller (3), an air pipe (10) is provided on the side wall of the sealing box (5), one end of the air pipe (10) is provided in communication with a compressed air source, and a ball valve (11) and a pressure reducing valve (12) are provided on the air pipe (10) in sequence; A bracket (13) is provided on one side of the volute (2), the sealing box (5) is arranged in the bracket (13), the bracket (13) is provided with a first adjustment component for driving the sealing box (5) to move along the Y-axis direction, and the bracket (13) is provided with a second adjustment component for driving the sealing box (5) to move along the X-axis direction; The first adjustment component comprises a first gear (14); an adjustment seat (15) is provided on one side of the sealing box (5); a rack (16) is provided on the inner wall of the adjustment seat (15); the first gear (14) is rotatably provided on the inner side of the adjustment seat (15); the first gear (14) is meshed with the rack (16); and the bracket (13) is provided with a rotating member for driving the first gear (14) to rotate; The second adjustment component comprises a screw rod (20) and a guide rod (21), the screw rod (20) is rotatably arranged in the bracket (13), a threaded block (22) is provided on the side wall thread sleeve of the screw rod (20), and the threaded block (22) is slidably connected to one side of the adjustment seat (15), the guide rod (21) is arranged in the bracket (13), a sliding block (23) is provided on the side wall sliding sleeve of the guide rod (21), and the sliding block (23) is slidably connected to one side of the adjustment seat (15); The rotating member is a first knob (17), a rotating frame (18) is arranged inside the threaded block (22), a rotating shaft (19) is coaxially arranged on one side of the first knob (17), one end of the rotating shaft (19) rotates and passes through the rotating frame (18), and one end of the rotating shaft (19) is coaxially connected to the first gear (14).

2. A fan volute according to claim 1, characterized in that: The bracket (13) comprises a fixing portion (25) and an extending portion (26), wherein the fixing portion (25) is arranged on one side of the volute (2), one end of the extending portion (26) extends and is slidably arranged in the fixing portion (25), and the fixing portion (25) is provided with a fixing component for fixing the extending portion (26).

3. A fan volute according to claim 2, characterized in that: The fixing assembly comprises a locking rod (27), an auxiliary frame (28) is provided on the side wall of the fixing portion (25), the locking rod (27) is slidably connected to the auxiliary frame (28), one end of the locking rod (27) extends into the fixing portion (25), a plurality of locking holes (29) are provided on the side wall of the extending portion (26), one end of the locking rod (27) is respectively plugged into the plurality of locking holes (29), and the auxiliary frame (28) is provided with an elastic member for cooperating with the movement of the locking rod (27).

4. A fan volute according to claim 3, characterized in that: The elastic member is a spring (30), which is sleeved on the locking rod (27), one end of the spring (30) is fixedly connected to the side wall of the locking rod (27), and the other end of the spring (30) is fixedly connected to the inner wall of the auxiliary frame (28).

5. The fan volute according to claim 1, characterized in that: A sealing soft ring (31) is provided on the side of the sealing box (5) facing the volute (2), and an air passage (32) is provided on the box wall of the sealing box (5), one end of the air passage (32) is connected to the air pipe (10), and the other end of the air passage (32) is connected to the sealing soft ring (31).

6. A fan volute according to claim 1, characterized in that: The gap between the impeller shaft (9) and the hole wall of the through hole (6) is controlled within 1.5 mm.

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