Wall-mounted centrifugal fan

Abstract

The invention relates to the technical field of centrifugal fans, in particular to a wall-mounted centrifugal fan which comprises a volute, an impeller and a driving motor, the volute comprises a front plate, a rear plate and a volute plate, the front plate is parallel to the rear plate, and the volute plate is located between the front plate and the rear plate; an installation hole used for installation is formed in the portion, located on the outer side of the volute plate, of the rear plate, the driving motor is fixed to the side, away from the volute plate, of the rear plate and coaxially connected with the impeller, the impeller is arranged in the volute, an open hole is formed in the middle of the front plate, and one end of the volute plate is matched with the front plate and the rear plate to form an air outlet. The rear plate with the volute can be mounted on a wall surface or a vertical surface of equipment, so that an independently arranged support frame is omitted, the use amount of materials is reduced, the cost is reduced, and meanwhile, the mounting space is saved.

Description

Technical Field

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

[0002] Centrifugal fans are mainly used for ventilation and air change, improving the air quality in the room, reducing the impact of dirty air on human health, and improving the work efficiency of staff in this occasion. Centrifugal fans can be used in industrial plants, data centers, and large storage spaces. Centrifugal fans are usually connected with exhaust ducts, and one end of the exhaust duct leads to the outside.

[0003] A centrifugal fan is disclosed in the related art, which includes a fan main body and a support base. An air outlet is provided at the upper end of the fan main body, and an opening is provided at the left end of the air outlet. A motor is connected to the rotating shaft on the upper side of the right end of the fan main body, and the motor is electrically connected to an external power supply. A support frame is bolted to the lower side of the right end of the fan main body, and the lower end of the motor is bolted to the support base. The support base is welded and supported through the support frame. An impeller is connected to the internal rotating shaft of the fan main body at the middle part of the opening. The impeller includes a wheel body, blades, and a bearing seat. The outer end of the wheel body is evenly welded with blades, and the bearing seat is welded to the middle part of the blades. The motor drives the impeller to rotate, and the impeller draws air into the fan main body through the opening and then discharges it from the air outlet. During installation, the support frame needs to be installed on a dedicated ground foundation platform.

[0004] However, in the above structure for large centrifugal fans, due to the large size of the fan main body, the support frame needs to be extended to the lower part of the fan main body, resulting in a large amount of materials used for the support frame. Summary of the Invention

[0005] In order to eliminate the need for a separately provided support frame and reduce the amount of materials used, the present application provides a wall-mounted centrifugal fan.

[0006] The present application provides a wall-mounted centrifugal fan, adopting the following technical solutions: A wall-mounted centrifugal fan includes a volute, an impeller, and a driving motor. The volute includes a front plate, a rear plate, and a volute plate. The front plate and the rear plate are parallel, and the volute plate is located between the front plate and the rear plate. An installation hole for installation is provided at the part of the rear plate located outside the volute plate. The driving motor is fixed on the side of the rear plate away from the volute plate and is coaxially connected to the impeller. The impeller is arranged inside the volute. An opening is provided at the middle part of the front plate, and a streamlined venturi tube for air intake is installed at the opening. One end of the volute plate cooperates with the front plate and the rear plate to form an air outlet.

[0007] By adopting the above technical solution, during use, the volute includes a front plate, a rear plate and a volute plate. The size of the rear plate is larger than that of the volute plate, so that mounting holes can be formed in the part of the rear plate located outside the volute plate. During installation, the rear plate is attached to a vertical wall or the vertical surface of a device, and then bolts are inserted into the mounting holes to fix the centrifugal fan. At the same time, the drive motor is fixed on the rear plate, and the drive motor drives the impeller to rotate, so that the rear plate can be used to replace the support frame independently used for fixing the centrifugal fan, reducing the amount of material used.

[0008] Preferably, a stabilizing frame is provided on the side of the rear plate away from the volute plate. The stabilizing frame includes a motor base plate, a connecting plate and a reinforcing plate. The motor base plate is horizontally arranged. The connecting plate is fixed on the upper surface of the motor base plate and is fixedly connected to the rear plate. The reinforcing plate is arranged on the lower surface of the motor base plate and is fixedly connected to the rear plate. The drive motor is placed on the upper surface of the motor base plate, and the end face of the drive motor close to the rear plate is fixedly connected to the rear plate by bolts.

[0009] By adopting the above technical solution, the motor base plate can support the drive motor, and both the connecting plate and the reinforcing plate are used to stabilize the drive motor, improving the connection stability of the drive motor on the rear plate.

[0010] Preferably, one connecting plate is provided on each side of the drive motor, and a fixing bolt is threadedly connected to the connecting plate. The end of the fixing bolt penetrates through the connecting plate and abuts against the lower part of the drive motor.

[0011] By adopting the above technical solution, a fixing bolt is threadedly connected to the connecting plate. The fixing bolt is used to abut against the lower part of the drive motor. The fixing bolt is mainly used to reduce the lateral movement of the drive motor, and at the same time, the vertical support of the drive motor is provided by the motor base plate and the rear plate.

[0012] Preferably, a bakelite pad is provided between the drive motor and the rear plate. The bakelite pad is used to block the heat transfer from the rear plate to the drive motor.

[0013] By adopting the above technical solution, the heat transfer between the drive motor and the rear plate is blocked by the bakelite pad, so that the drive motor can be protected when the temperature inside the volute is relatively high, reducing the damage of the drive motor.

[0014] Preferably, the impeller includes a bottom plate and blades. The blades are arranged along the edge of the bottom plate. A connection component is provided at the center of the bottom plate. The connection component includes a shaft disc, a shaft cover, and an intermediate bolt. The shaft disc is coaxially arranged with the bottom plate, and the edge of the shaft disc is fixed to the bottom plate by bolts. The output shaft of the driving motor penetrates into the center of the shaft disc, and key grooves are provided at the center of the output shaft of the driving motor and the shaft disc. The output shaft of the driving motor and the shaft disc are connected by placing a flat key in the key grooves. The shaft cover is arranged at the end of the shaft disc away from the driving motor, and the intermediate bolt penetrates through the shaft cover and is threadedly connected to the output shaft of the driving motor.

[0015] By adopting the above technical solution, the edge of the shaft disc is fixed to the bottom plate by bolts, and the output shaft of the driving motor is connected to the center of the shaft disc by a flat key, enabling the driving motor to drive the impeller to rotate. At the same time, the shaft cover is pressed against the shaft disc by the intermediate bolt at one end of the driving motor to prevent the impeller from falling off the output shaft of the driving motor.

[0016] Preferably, an anti-rotation screw is threadedly connected to the shaft cover, and the anti-rotation screw penetrates through the shaft cover and is inserted into the key groove provided on the shaft disc.

[0017] By adopting the above technical solution, the anti-rotation screw is threadedly connected to the shaft cover, and then the end of the anti-rotation screw is inserted into the key groove, thereby being able to reduce the loosening of the intermediate bolt caused by the rotation of the shaft cover during the rotation of the impeller.

[0018] Preferably, a heat dissipation wheel for reducing the heat transfer to the driving motor is coaxially and fixedly arranged on the output shaft of the driving motor, and a protective cover is arranged outside the heat dissipation wheel.

[0019] By adopting the above technical solution, a heat dissipation wheel is arranged on the output shaft of the driving motor. Since the heat dissipation wheel rotates under the drive of the driving motor, the heat dissipation wheel can diffuse the heat on the output shaft of the driving motor through rotation, reducing the damage to the driving motor caused by the impeller transferring heat to the driving motor. The protective cover can prevent the heat dissipation wheel from rotating and hurting people.

[0020] Preferably, an outlet flange is provided at the position of the air outlet. The outlet flange is integrally formed in a U shape, and the opening of the U shape of the outlet flange faces the rear plate. The outlet flange is sleeved on the front plate and the volute plate and is fixedly connected to the front plate and the volute plate.

[0021] By adopting the above technical solution, the outlet flange is integrally formed in a U shape, enabling the outlet flange to be sleeved on the front plate and the volute plate, which is convenient for connecting the air outlet pipe to the outlet flange on-site.

[0022] Preferably, a connecting strip is provided at the opening of the U shape of the outlet flange. The connecting strip is fixed to the rear plate, and both ends of the connecting strip extend to both ends of the outlet flange.

[0023] By adopting the above technical solution, the connecting strip is fixed on the rear plate. The connecting strip is used to cooperate with the outlet flange to seal between the connecting strip and the pipeline, thereby improving the sealing performance of the pipeline at the air outlet.

[0024] Preferably, a sealing assembly is arranged at the opening of the U-shaped outlet flange. The sealing assembly includes a tensioning plate, a pressing plate and a tensioning bolt. The tensioning plate penetrates through the rear plate and extends into the volute. One end of the tensioning plate located inside the volute is hook-shaped and faces the air outlet. The pressing plate is sleeved on the tensioning plate and is located on the side of the rear plate away from the front plate. A sealing gasket is arranged between the pressing plate and the rear plate, and a sealing ring is arranged at the position where the pressing plate is connected to the tensioning plate. The tensioning bolt is threadedly connected to the tensioning plate and abuts against the surface of the pressing plate away from the rear plate.

[0025] By adopting the above technical solution, one end of the tensioning plate is hook-shaped, so that the pipeline inner wall for connection at the air outlet is clamped between the tensioning plate and the rear plate. Then, by abutting the tensioning bolt against the pressing plate, the tensioning bolt presses the sealing gasket to seal the connection between the pressing plate and the rear plate. At the same time, the sealing ring also seals the position between the pressing plate and the tensioning plate, improving the convenience and sealing performance of the air outlet for connecting the pipeline.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. Installation holes can be opened at the part of the rear plate located outside the volute housing plate. During installation, the rear plate is attached to a vertical wall or the vertical surface of a device, and then bolts are inserted through the installation holes to fix the centrifugal fan. At the same time, the drive motor is fixed on the rear plate, so that the rear plate can be used to replace the separate support frame for fixing the centrifugal fan, reducing the amount of material used; at the same time, there is no need to install a foundation on the ground, saving the occupied ground space. 2. By threadedly connecting the anti-rotation screw to the shaft cover and then inserting the end of the anti-rotation screw into the keyway, it is possible to reduce the loosening of the intermediate bolt caused by the rotation of the shaft cover during the rotation of the impeller. 3. By clamping the pipeline inner wall for connection at the air outlet between the tensioning plate and the rear plate, and then abutting the tensioning bolt against the pressing plate, the tensioning bolt presses the sealing gasket to seal the connection between the pressing plate and the rear plate. At the same time, the sealing ring also seals the position between the pressing plate and the tensioning plate, improving the convenience and sealing performance of the air outlet for connecting the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the overall structure schematic diagram of Embodiment 1 of the present application Figure 1 ; Figure 2 is the overall structure schematic diagram of Embodiment 1 of the present application Figure 2 ; Figure 3It is a schematic diagram of the internal structure of the volute in Embodiment 1 of the present application; Figure 4 It is an exploded view of the connection component in Embodiment 1 of the present application; Figure 5 It is a schematic diagram of the structure of the Venturi tube in Embodiment 1 of the present application; Figure 6 It is a schematic diagram of the structure of the connecting bar in Embodiment 2 of the present application; Figure 7 It is a schematic diagram of the position of the sealing component in Embodiment 3 of the present application; Figure 8 It is a schematic diagram of the structure of the gasket in Embodiment 3 of the present application; Figure 9 It is a schematic diagram of the installation position of the cooling wheel in Embodiment 4 of the present application.

[0028] Explanation of reference numerals: 1, volute; 11, front plate; 12, rear plate; 121, mounting hole; 122, through hole; 13, volute plate; 2, impeller; 21, bottom plate; 22, blade; 23, impeller front disc; 3, drive motor; 31, cooling wheel; 32, cooling blade plate; 33, protective cover; 4, Venturi tube; 41, opening; 42, air outlet; 43, inlet flange; 44, outlet flange; 45, bolt hole; 5, stabilizer; 51, motor seat plate; 52, connecting plate; 53, reinforcing plate; 54, fixing bolt; 6, bakelite pad; 7, connection component; 71, shaft disc; 72, shaft cover; 73, intermediate bolt; 74, keyway; 75, anti-rotation screw; 8, connecting bar; 81, inclined surface; 9, sealing component; 91, tension plate; 92, pressing plate; 921, long slot; 93, tension bolt; 94, shoulder; 95, gasket; 96, annular groove; 97, sealing ring; 10, extension plate. Detailed implementation manners

[0029] The following further elaborates on the present application in conjunction with the attached Figures 1-9 for a more detailed description of the present application.

[0030] Embodiment 1 of the present application discloses a wall-mounted centrifugal fan.

[0031] Embodiment 1 This embodiment discloses a wall-mounted centrifugal fan. Refer to Figure 1, including a volute 1, an impeller 2 and a driving motor 3. The volute 1 includes a front plate 11, a rear plate 12 and a volute plate 13. The front plate 11 is parallel to the rear plate 12. The rear plate 12 can be set as a rectangle. The edge of the front plate 11 is arranged in a spiral shape along the volute plate 13. The volute plate 13 is located between the front plate 11 and the rear plate 12, and the front plate 11, the rear plate 12 and the volute plate 13 are welded and sealed. A plurality of mounting holes 121 are opened at the edge of the rear plate 12 and outside the area surrounded by the volute plate 13. The driving motor 3 is fixed on the rear plate 12. The impeller 2 is located inside the volute 1, and the output shaft of the driving motor 3 is coaxially and fixedly arranged with the impeller 2. The driving motor 3 is used to drive the impeller 2 to rotate inside the volute 1, so as to form a flowing air current inside the volute 1. An opening 41 is opened at the position corresponding to the center of the front plate 11 and the center of the impeller 2. One end of the volute plate 13 cooperates with the front plate 11 and the rear plate 12 to form a rectangular air outlet 42. The mounting holes 121 on the rear plate 12 can fix the rear plate 12 on a vertical wall or the vertical surface of a device. The thickness of the rear plate 12 needs to be sufficient to bear the dynamic and static loads of the entire centrifugal fan. Since the rear plate 12 is a part of the volute 1, it can also replace a separately provided support frame, thereby reducing the materials used in production.

[0032] Reference Figure 2 and Figure 3 , a stabilizing frame 5 for stabilizing the driving motor 3 is arranged on the side of the rear plate 12 away from the volute plate 13. The stabilizing frame 5 includes a motor base plate 51, a connecting plate 52 and a reinforcing plate 53. The motor base plate 51 is arranged horizontally, and the driving motor 3 is placed on the surface of the motor base plate 51. The end face of the driving motor 3 close to the rear plate 12 is fixed on the rear plate 12 by bolts. When the temperature of the medium flowing inside the volute 1 is 61 - 120 °C, a bakelite pad 6 is arranged between the driving motor 3 and the rear plate 12. The bakelite pad 6 increases the distance between the rear plate 12 and the driving motor 3 and reduces the heat transfer between the rear plate 12 and the driving motor 3, thereby reducing the damage to the driving motor 3. The bakelite pad 6 can be sleeved on the bolts used to connect the driving motor 3 to prevent the bakelite pad 6 from falling off. The connecting plate 52 is perpendicular to the motor base plate 51 and is located on both sides of the motor base plate 51. One side of the connecting plate 52 is welded to the motor base plate 51, and the side of the connecting plate 52 close to the rear plate 12 is welded to the rear plate 12, so that the connecting plate 52 can increase the stability of the motor base plate 51. A plurality of reinforcing plates 53 are arranged below the motor base plate 51. In this embodiment, three reinforcing plates 53 are arranged. The reinforcing plates 53 are welded between the rear plate 12 and the motor base plate 51, and are used to stabilize the motor base plate 51 through the reinforcing plates 53. A fixing bolt 54 is arranged on the connecting plate 52 parallel to the motor base plate 51. The fixing bolt 54 is threadedly connected to the connecting plate 52. The end of the fixing bolt 54 points to the driving motor 3 and abuts against the lower part of the driving motor 3, and the lateral movement of the driving motor 3 is restricted through the fixing bolt 54.

[0033] ReferenceFigure 3 and Figure 4 , the impeller 2 includes a bottom plate 21, blades 22 and an impeller front disc 23. A plurality of blades 22 are circumferentially arranged along the edge of the bottom plate 21. The impeller front disc 23 is arranged on the side of the blades 22 away from the bottom plate 21. A connecting component 7 is arranged between the center of the bottom plate 21 and the output shaft of the driving motor 3. The connecting component 7 includes a shaft disc 71, a shaft cover 72 and an intermediate bolt 73. The shaft disc 71 is coaxially arranged with the bottom plate 21 and the edge of the shaft disc 71 is fixed on the bottom plate 21 by bolts. The output shaft of the driving motor 3 penetrates into the center of the shaft disc 71, and the output shaft of the driving motor 3 is connected with the shaft disc 71 by a flat key. Key grooves 74 are provided on both the shaft disc 71 and the output shaft of the driving motor 3. The shaft disc 71 and the output shaft of the driving motor 3 are coaxially rotationally connected by placing a flat key in the key groove 74. The shaft cover 72 is arranged on the side of the shaft disc 71 away from the driving motor 3. The center of the shaft cover 72 penetrates through the intermediate bolt 73, and the end of the intermediate bolt 73 is threadedly connected to the output shaft of the driving motor 3, so that the shaft disc 71 is firmly connected to the driving motor 3 by the intermediate bolt 73, reducing detachment. A heat dissipation wheel 31 is coaxially and fixedly arranged on the output shaft of the driving motor 3. The heat dissipation wheel 31 is made of a material with good heat conduction, such as aluminum alloy. The heat dissipation wheel 31 is located outside the volute 1. The heat dissipation wheel 31 rotates driven by the driving motor 3, and the heat dissipation wheel 31 conducts out the heat transferred from the output shaft of the driving motor 3 to the driving motor 3 by the impeller 2, reducing damage to the driving motor 3. An anti-rotation screw 75 is also threadedly connected to the shaft cover 72, and one end of the anti-rotation screw 75 is inserted into the key groove 74 provided on the shaft disc 71.

[0034] Reference Figure 1 and Figure 5 , a streamlined Venturi tube 4 is arranged at the position of the opening 41 to facilitate the inflow of air, making the air intake smoother. Cooperating with the impeller 2 and the volute 1, better performance and higher efficiency are obtained. An inlet flange 43 is arranged on the side of the opening 41 away from the Venturi tube 4. An outlet flange 44 is arranged at the position of the air outlet 42. The inlet flange 43 is arranged in a circular ring shape. One end of the inlet flange 43 is fixed on the front plate 11 by bolts and the inlet flange 43 is coaxially arranged with the Venturi tube 4. The other end of the inlet flange 43 can be connected to the air inlet pipe by bolts, and the installation is relatively convenient. The outlet flange 44 is integrally arranged in a U shape, and the opening of the U shape of the outlet flange 44 faces the rear plate 12. The cross section of the outlet flange 44 is in an L shape, so that a bolt hole 45 is opened on one side of the outlet flange 44, and the other side is used to sleeved on the outside of the front plate 11 and the volute plate 13. The outlet flange 44 can be fixed on the volute 1 by welding.

[0035] Embodiment 2 This embodiment discloses a wall-mounted centrifugal fan, reference Figure 6, the difference from Embodiment 1 is that a connecting bar 8 is provided at the opening position of the U shape formed by the outlet flange 44. The two ends of the connecting bar 8 extend to the two ends of the outlet flange 44, so that the connecting bar 8 is welded to the surface of the rear plate 12. At the same time, threaded holes are provided on the connecting bar 8 for mating with the outlet flange 44. One side of the connecting bar 8 is flush with the end face of the outlet flange 44, which is convenient for connecting pipes to the outlet flange 44 and has good sealing performance. The side of the connecting bar 8 facing the inside of the volute 1 is provided as an inclined surface 81.

[0036] Embodiment 3 This embodiment discloses a wall-mounted centrifugal fan. Refer to Figure 7 and Figure 8 , the difference from Embodiment 1 is that a sealing assembly 9 is provided at the position of the U-shaped opening of the outlet flange 44. The sealing assembly 9 includes a tensioning plate 91, a pressing plate 92 and a tensioning bolt 93. A through hole 122 is provided on the rear plate 12 for inserting the tensioning plate 91. One end of the tensioning plate 91 extends from the through hole 122 into the inside of the volute 1, and one end of the tensioning plate 91 located inside the volute 1 is provided as a hook shape and faces the air outlet 42. An extension plate 10 is provided on the pipe connected to the outlet flange 44. The extension plate 10 is inserted into the position between the hook part of the tensioning plate 91 and the rear plate 12, and then the tensioning plate 91 is pulled towards the outside of the volute 1, so that the hook part of the tensioning plate 91 presses the extension plate 10 against the rear plate 12, thereby enabling better sealing between the volute 1 and the pipe. A long hole 921 is provided in the middle of the pressing plate 92, so that the tensioning plate 91 passes through the long hole 921. A shoulder 94 is integrally provided at one end of the tensioning plate 91 away from the rear plate 12. The tensioning bolt 93 is threadedly connected to the shoulder 94, and the end of the tensioning bolt 93 abuts against one end of the pressing plate 92 away from the rear plate 12. By the tensioning bolt 93, the tensioning plate 91 can be moved towards the outside of the volute 1, and at the same time, the pressing plate 92 is abutted against the surface of the rear plate 12. A sealing gasket 95 is provided between the pressing plate 92 and the rear plate 12. After being squeezed, the sealing gasket 95 seals the connection between the pressing plate 92 and the rear plate 12. At the same time, an annular groove 96 is provided on the inner wall of the long hole 921, and a sealing ring 97 is provided in the annular groove 96 for sealing between the pressing plate 92 and the tensioning plate 91, so that the position where the through hole 122 is provided on the rear plate 12 can be well sealed by the sealing gasket 95 and the sealing ring 97.

[0037] Embodiment 4 This embodiment discloses a wall-mounted centrifugal fan. Refer to Figure 9, which is different from the embodiment 1, the embodiment 2 and the embodiment 3 in that: a plurality of heat dissipation blades 32 are arranged on the side of the heat dissipation wheel 31 facing away from the rear plate 12, and the heat dissipation blades 32 are arranged along the radial direction of the heat dissipation wheel 31 from the center to the outside. The heat dissipation wheel 31 is divided into two halves as a whole, and the two halves are fixed by bolts, which is convenient for the installation and removal of the heat dissipation wheel 31. The height of the bakelite pad 6 is set according to the thickness of the heat dissipation wheel 31, so that there is enough space between the drive motor 3 and the rear plate 12 for installing the heat dissipation wheel 31. Since the heat dissipation blades 32 rotate with the drive motor 3, the heat dissipation speed can be faster. A protective cover 33 is arranged at the position of the heat dissipation wheel 31, one side of the protective cover 33 is fixed on the rear plate 12, and the other side extends to the middle part of the drive motor 3, so that the protective cover 33 can protect the entire position of the heat dissipation wheel 31, so as to reduce the sundries from being involved in the heat dissipation blades 32, and at the same time reduce the heat dissipation wheel 31 from hurting people.

[0038] 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 wall-mounted centrifugal fan, comprising a volute (1), an impeller (2) and a drive motor (3), characterized in that: The volute (1) comprises a front plate (11), a rear plate (12) and a volute plate (13); the front plate (11) is parallel to the rear plate (12) and the volute plate (13) is located between the front plate (11) and the rear plate (12); a mounting hole (121) for mounting is provided at a portion of the rear plate (12) located outside the volute plate (13); the drive motor (3) is fixed to a side of the rear plate (12) away from the volute plate (13) and is coaxially connected to the impeller (2); the impeller (2) is arranged in the volute (1); an opening (41) is provided in the middle of the front plate (11); a streamlined venturi tube (4) for utilizing air intake is installed at the opening (41); one end of the volute plate (13) cooperates with the front plate (11) and the rear plate (12) to form an air outlet (42).

2. A wall-mounted centrifugal fan according to claim 1, characterized in that: A stabilizing frame (5) is provided on a side of the rear plate (12) away from the volute plate (13), the stabilizing frame (5) comprising a motor base plate (51), a connecting plate (52) and a reinforcing plate (53), the motor base plate (51) being arranged horizontally, the connecting plate (52) being fixed on an upper surface of the motor base plate (51) and the connecting plate (52) being fixedly connected to the rear plate (12), the reinforcing plate (53) being arranged on a lower surface of the motor base plate (51) and being fixedly connected to the rear plate (12), the driving motor (3) being placed on an upper surface of the motor base plate (51), and the end surface of the driving motor (3) close to the rear plate (12) being fixedly connected to the rear plate (12) by bolts.

3. A wall-mounted centrifugal fan according to claim 2, characterized in that: The connecting plate (52) is provided at each side of the drive motor (3), and a fixing bolt (54) is threadedly connected to the connecting plate (52), with the end of the fixing bolt (54) passing through the connecting plate (52) and abutting against the lower part of the drive motor (3).

4. A wall-mounted centrifugal fan according to claim 2, characterized in that: A bakelite pad (6) is provided between the drive motor (3) and the rear plate (12), and the bakelite pad (6) is used to block heat transfer from the rear plate (12) to the drive motor (3).

5. The wall-mounted centrifugal fan according to claim 1, characterized in that: The impeller (2) comprises a base plate (21) and blades (22), wherein the blades (22) are arranged along the edge of the base plate (21); a connecting assembly (7) is arranged at the center of the base plate (21); the connecting assembly (7) comprises a shaft disc (71), a shaft cover (72) and an intermediate bolt (73); the shaft disc (71) is arranged coaxially with the base plate (21) and the edge of the shaft disc (71) is fixed to the base plate (21) by bolts; the output shaft of the drive motor (3) penetrates the center of the shaft disc (71); a keyway (74) is provided between the output shaft of the drive motor (3) and the center of the shaft disc (71); the output shaft of the drive motor (3) and the shaft disc (71) are connected by placing a flat key in the keyway (74); the shaft cover (72) is arranged at one end of the shaft disc (71) away from the drive motor (3); and the intermediate bolt (73) penetrates the shaft cover (72) and is threadedly connected to the output shaft of the drive motor (3).

6. A wall-mounted centrifugal fan according to claim 5, characterized in that: The shaft cover (72) is threadedly connected with an anti-rotation screw (75), which passes through the shaft cover (72) and is inserted into a keyway (74) provided on the shaft disc (71).

7. The wall-mounted centrifugal fan according to claim 4, characterized in that: A heat dissipation wheel (31) for reducing the transfer of heat to the drive motor (3) is coaxially fixedly arranged on the output shaft of the drive motor (3), and a protective cover (33) is arranged on the outer side of the heat dissipation wheel (31).

8. The wall-mounted centrifugal fan according to claim 1, characterized in that: An outlet flange (44) is provided at the position of the air outlet (42); the outlet flange (44) is arranged in a U-shape as a whole, and the U-shaped opening of the outlet flange (44) faces the rear plate (12); the outlet flange (44) is sleeved on the front plate (11) and the volute plate (13), and is fixedly connected to the front plate (11) and the volute plate (13).

9. A wall-mounted centrifugal fan according to claim 8, characterized in that: A connecting strip (8) is provided at the U-shaped opening of the outlet flange (44), the connecting strip (8) being fixed on the rear plate (12), and two ends of the connecting strip (8) extending to two ends of the outlet flange (44).

10. The wall-mounted centrifugal fan according to claim 8, characterized in that: A sealing assembly (9) is provided at the U-shaped opening of the outlet flange (44), and the sealing assembly (9) comprises a tensioning plate (91), a pressure plate (92) and a tensioning bolt (93). The tensioning plate (91) passes through the rear plate (12) and extends into the volute (1). One end of the tensioning plate (91) located in the volute (1) is hook-shaped and faces the air outlet (42). The pressure plate (92) is sleeved on the tensioning plate (91) and is located on a side of the rear plate (12) away from the front plate (11). A sealing gasket (95) is provided between the pressure plate (92) and the rear plate (12). A sealing ring (97) is provided at a position where the pressure plate (92) and the tensioning plate (91) are connected. The tensioning bolt (93) is threadedly connected to the tensioning plate (91) and abuts against a surface of the pressure plate (92) away from the rear plate (12).

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