Centrifugal fan

Abstract

The utility model relates to a centrifugal fan, which comprises a shell, an air inlet, an air outlet pipeline, an air inlet, an air outlet and an air outlet, wherein the shell is provided with a cavity, and the air inlet and the air outlet pipeline are communicated with the cavity; the motor is provided with a driving shaft, and the driving shaft extends into the cavity; the connecting assembly comprises a sleeve piece connected with the driving shaft in a sleeving mode, a locking piece for fixing the sleeve piece, a protection plug covering the locking piece and a sealing piece installed on the shell, a sealing ring is arranged at the connecting position of the protection plug and the locking piece, and the sealing piece extends towards the sleeve piece and makes contact with the sleeve piece; the impeller is positioned in the cavity and is fixedly connected with the external member; the protective plug covering the locking piece and the sealing piece installed on the shell are matched with the impeller wrapping the external member, so that damage caused by excessive contact of gas with the driving shaft and the motor is prevented, the service life is prolonged, and the cost of the fan is reduced due to corrosion-resistant materials.

Description

Technical Field

[0001] This invention relates to the field of fan technology, and more particularly to a centrifugal fan. Background Technology

[0002] A fan is a device that uses mechanical energy to compress and transport gas (usually air), and it is widely used in industry, construction, energy, environmental protection and other fields.

[0003] Chinese patent CN220487889U discloses a centrifugal fan, which includes a volute, an impeller, a motor, and a base. The impeller is located inside the volute, and the motor is connected to the rear end of the volute. The rotating shaft of the motor output end passes through and extends into the volute and is fixedly connected to the impeller. The front end of the volute has an air inlet, and the air inlet is equipped with a filter screen covering the air inlet. The upper end of the volute has an upwardly extending air outlet pipe, and the air outlet pipe has an air outlet channel that communicates with the interior of the volute. The air outlet channel in the air outlet pipe gradually decreases in size from bottom to top.

[0004] The fan has a filter screen added to the air inlet of the volute. The filter screen can isolate and filter large debris from the outside when the air is drawn in, preventing the inhaled debris from damaging the impeller and affecting the fan. However, when the fan is transporting gas, some gases are corrosive. These gases can damage the impeller and its connection with the motor, affecting the service life of the fan.

[0005] Therefore, a centrifugal fan needs to be developed to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a centrifugal fan that extends service life and reduces costs.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a centrifugal fan, comprising:

[0008] The outer casing has a cavity and an air inlet and an air outlet duct communicating with the cavity;

[0009] An electric motor having a drive shaft that extends into the cavity;

[0010] The connecting assembly includes a kit that fits onto the drive shaft, a locking member that secures the kit, a protective plug that covers the locking member, and a seal mounted on the housing. A sealing ring is provided at the connection between the protective plug and the locking member, and the seal extends toward the kit and contacts the kit.

[0011] The impeller is located inside the cavity and is fixedly connected to the assembly.

[0012] Furthermore, the connecting components exposed within the cavity are made of corrosion-resistant material.

[0013] Furthermore, the kit is made of polytetrafluoroethylene.

[0014] Furthermore, the end of the kit extends radially outward to form a T-shape, and the end of the kit has a connecting groove recessed inward from its outer surface, and the impeller extends into the connecting groove and is fixedly connected to the kit.

[0015] Furthermore, the kit also has a fixing groove formed by recessing inward from its end face, and the locking member enters the fixing groove and is fixedly connected to the kit and the drive shaft.

[0016] Furthermore, the protective plug is installed in the fixing groove and engages with the fixing groove.

[0017] Furthermore, the outer surface of the seal is abutting and connected to the housing, and the inner surface forms a first abutting foot and a second abutting foot. The first abutting foot extends obliquely, and its end abuts against the outer surface of the kit. The second abutting foot extends obliquely in another direction, and its end abuts against the outer surface of the kit. The first abutting foot and the second abutting foot form an angle.

[0018] Furthermore, the end of the second supporting foot is provided with a reinforcing part, one end of which is fixedly connected to the second supporting foot, and the other end extends obliquely outward.

[0019] Furthermore, the impeller is fitted with the end of the kit at its middle position, extending along the surface of the kit and adjacent to the protective plug.

[0020] Furthermore, the impeller is made of plastic and includes a wheel body and fan blades disposed on the surface of the wheel body. The fan blades include a plurality of first fan blades and a plurality of second fan blades. Both the first fan blades and the second fan blades are arc-shaped, with their inner ends close to the center of the wheel body and their outer ends extending to the edge of the wheel body.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model is a centrifugal fan with the characteristics of extending service life and reducing cost. By using the protective plug covering the locking part and the sealing part installed on the outer shell, together with the impeller covering the kit, excessive gas contact with the drive shaft and motor is prevented from causing damage, thus extending the service life. Secondly, the corrosion-resistant material reduces the cost of the fan. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0023] Figure 1 This is a side sectional view of a centrifugal fan according to the present invention;

[0024] Figure 2 for Figure 1 The front view of the centrifugal fan shown;

[0025] Figure 3 for Figure 1 The diagram shows the other side of the centrifugal fan.

[0026] Figure 4 for Figure 1 A partial structural schematic diagram of the centrifugal fan shown;

[0027] Figure 5 for Figure 1 The diagram shows the impeller structure of a centrifugal fan.

[0028] In the diagram: 1. Housing; 2. Motor; 3. Connecting assembly; 4. Impeller; 11. First housing; 12. Second housing; 13. Air outlet duct; 14. Cavity; 15. Air inlet; 21. Drive shaft; 31. Kit; 32. Locking component; 33. Sealing ring; 34. Sealing component; 311. Connecting groove; 312. Fixing groove; 35. Protective plug; 36. Fixing component; 341. First supporting foot; 342. Second supporting foot; 343. Reinforcing part; 41. Wheel body; 42. Fan blade; 421. First fan blade; 422. Second fan blade. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please refer to Figures 1 to 5 This utility model is a centrifugal fan, which includes a housing 1, a motor 2 installed on the outside of the housing 1, a connecting component 3 connected to the motor 2, and an impeller 4 sleeved on the connecting component 3 and located inside the housing 1.

[0031] Please refer to Figures 1 to 3The outer casing 1 includes a first casing 11 and a second casing 12, and an air outlet duct 13 connecting the first casing 11 and the second casing 12. A cavity 14 is formed between the first casing 11 and the second casing 12. The cavity 14 is used to house the impeller 4. The second casing 12 has an air inlet 15 penetrating its two side surfaces. Both the air outlet duct 13 and the air inlet 15 are connected to the cavity 14. Furthermore, the first casing 11 and the second casing 12 are fixedly connected to each other by bolts or screws.

[0032] Please refer to Figure 1 The motor 2 is fixed at the center of the first housing 11 and has a drive shaft 21 that extends into the cavity 14.

[0033] Please refer to Figure 1 and Figure 4 The connecting assembly 3 includes a kit 31, a locking member 32 for fixing the kit 31, a sealing ring 33 surrounding the kit 31, and a sealing member 34. The kit 31 is fitted onto the drive shaft 21 and rotates synchronously with the drive shaft 21. The end of the kit 31 extends radially outward to form a T-shape. The kit 31 has a connecting groove 311 formed by recessing from its outer surface at the end. The connecting groove 311 is used for fixed connection with the impeller 4. The kit 31 also has a fixing groove 312 formed by recessing from its end face at the end. The fixing groove 312 is used to accommodate the locking member 32. The locking member 32 enters into the fixing groove 312 and passes through the kit 31 and is fixedly connected to the drive shaft 21. A protective plug 35 is also installed at the fixing groove 312. The protective plug 35 extends into the fixing groove 312 and engages with the fixing groove 312. A sealing ring 33 is provided at the connection between the protective plug 35 and the kit 31.

[0034] The seal 34 is ring-shaped, with its outer surface abutting against the first housing 11, and its inner surface forming a first abutting foot 341 and a second abutting foot 342. The first abutting foot 341 extends obliquely, with its end abutting against the outer surface of the kit 31, and the second abutting foot 342 extends obliquely in another direction, with its end abutting against the outer surface of the kit 31. The first abutting foot 341 and the second abutting foot 342 form an included angle, which is a right angle or an obtuse angle.

[0035] The second supporting foot 342 has a reinforcing part 343 at its end. One end of the reinforcing part 343 is fixedly connected to the second supporting foot 342, and the other end extends outward at an angle. The reinforcing part 343 is parallel to the first supporting foot 341.

[0036] Furthermore, the connecting component 3 exposed within the cavity 13 is made of a corrosion-resistant material. Preferably, the kit 31, the fastener 36, and the locking component 32 are made of polytetrafluoroethylene (PTFE), which is virtually unaffected by all strong acids, strong alkalis, and organic solvents, thus preventing the kit 31 and the fastener 36 from being corroded by harmful gases.

[0037] Please refer to Figure 1 and Figure 5 The impeller 4 is made of plastic and includes a wheel body 41 and a fan blade 42 disposed on the surface of the wheel body 41. The wheel body 41 is circular and is fixedly connected to the connecting component 3 at its middle position. Specifically, the end of the kit 31 is sleeved at the middle position of the impeller 4, extends into the connecting groove 311, and extends along the surface of the kit 31 adjacent to the protective plug 35 and adjacent to the fixing member 36.

[0038] The fan blade 42 includes a plurality of first fan blades 421 and a plurality of second fan blades 422. The first fan blades 421 are arc-shaped, with their inner ends close to the center of the wheel body 41 and their outer ends extending along the surface of the wheel body 41 to the edge of the wheel body 41. The number of the plurality of first fan blades 421 can be changed according to requirements and they are arranged around the center of the wheel body 41. The second fan blades 422 are arc-shaped, with their inner ends close to the center of the wheel body 41 and their outer ends extending along the surface of the wheel body 41 to the edge of the wheel body 41. The number of the plurality of second fan blades 422 can be changed according to requirements and they are arranged around the center of the wheel body 41 and are spaced apart from the plurality of first fan blades 421.

[0039] The height of the second blade 422 is less than the height of the first blade 421; the length of the second blade 422 is less than the length of the first blade 421.

[0040] In another embodiment, a fastener 36 is sleeved on the outer side of the kit 31, and a seal 34 is disposed on the outer side of the fastener 36. The first abutment foot 341 and the second abutment foot 342 respectively contact the outer surface of the fastener 36.

[0041] In this invention, a centrifugal fan is installed by placing the connecting component 3 into a mold, molding the impeller 4 through injection molding, and simultaneously fixing it to the connecting component 3. The impeller 4 is then placed into the cavity 14. The motor 2 is installed on the outer shell 1, and its drive shaft 21 extends through the outer shell 1 into the cavity 14 and is fixedly connected to the connecting component 3. When in use, the motor 2 is started, and the drive shaft 21 drives the connecting component 3 and its impeller 4 to rotate. The impeller 4 draws air from the air inlet 15 and discharges it through the air outlet duct 13.

[0042] This utility model is a centrifugal fan, which has the characteristics of extending service life and reducing cost. By using a protective plug covering the locking part and a seal installed on the outer shell, together with the impeller covering the kit, excessive gas contact with the drive shaft and motor is prevented from causing damage, thus extending the service life. Secondly, the corrosion-resistant material reduces the cost of the fan.

[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A centrifugal fan characterized by comprising: It includes: The outer casing (1) has a cavity (14) and an air inlet (15) and an air outlet (13) communicating with the cavity (14); The motor (2) has a drive shaft (21) that extends into the cavity (14); The connecting assembly (3) includes a kit (31) that fits onto the drive shaft (21), a locking member (32) that fixes the kit (31), a protective plug (35) that covers the locking member (32), and a sealing member (34) installed on the housing (1). A sealing ring (33) is provided at the connection between the protective plug (35) and the locking member (32). The sealing member (34) extends toward the kit (31) and contacts the kit (31). The impeller (4) is located inside the cavity (14) and is fixedly connected to the kit (31).

2. The centrifugal fan of claim 1, wherein The connecting component (3) exposed in the cavity (14) is made of corrosion-resistant material.

3. The centrifugal fan of claim 1, wherein The kit (31) is made of polytetrafluoroethylene.

4. The centrifugal fan of claim 1, wherein The end of the kit (31) extends radially outward to form a T-shape. The end of the kit (31) has a connecting groove (311) formed by recessing from its outer surface inward. The impeller (4) extends into the connecting groove (311) and is fixedly connected to the kit (31).

5. The centrifugal fan of claim 1, wherein The kit (31) also has a fixing groove (312) recessed inward from its end face, and the locking member (32) enters the fixing groove (312) and is fixedly connected through the kit (31) and the drive shaft (21).

6. The centrifugal fan of claim 5, wherein The protective plug (35) is installed in the fixing groove (312) and engages with the fixing groove (312).

7. The centrifugal fan of claim 1, wherein The outer surface of the seal (34) abuts against the outer shell (1), and the inner surface forms a first abutting foot (341) and a second abutting foot (342). The first abutting foot (341) extends obliquely, and its end abuts against the outer surface of the kit (31). The second abutting foot (342) extends obliquely in another direction, and its end abuts against the outer surface of the kit (31). The first abutting foot (341) and the second abutting foot (342) form an angle.

8. The centrifugal fan of claim 7, wherein The second abutment (342) has a reinforcing part (343) at its end. One end of the reinforcing part (343) is fixedly connected to the second abutment (342), and the other end extends obliquely outward.

9. The centrifugal fan of claim 1, wherein The impeller (4) is fitted onto the end of the kit (31) at the middle position and extends along the surface of the kit (31) adjacent to the protective plug (35).

10. The centrifugal fan of claim 1, wherein The impeller (4) is made of plastic and includes a wheel body (41) and fan blades (42) disposed on the surface of the wheel body (41). The fan blades (42) include a plurality of first fan blades (421) and a plurality of second fan blades (422). The first fan blades (421) and the second fan blades (422) are both arc-shaped, with their inner ends close to the center of the wheel body (41) and their outer ends extending to the edge of the wheel body (41).

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