Exhaust fan

Abstract

The utility model discloses an exhaust fan which comprises a shell and a servo motor, an air duct is arranged in the shell, the servo motor is arranged in the air duct, and an air inlet and an air outlet are formed in the shell. An output shaft of the servo motor is connected with a centrifugal wind wheel opposite to the air inlet, the servo motor is located in a cavity of the centrifugal wind wheel, the centrifugal wind wheel comprises a wheel body and a fixing support, the fixing support is arranged in the wheel body, and the wheel body and the fixing support are of an integrally-formed structure. The centrifugal fan is novel in structure, the servo motor drives the centrifugal wind wheel to rotate through the output shaft, heat on the surface of the servo motor can be taken away while air is exhausted, the temperature rise effect is avoided, and practicability is high; the centrifugal wind wheel is stable in structure and reliable in strength, compared with the prior art, the step-by-step operation that the wheel body and the fixing support are connected firstly and then the fixing support and the output shaft are connected is not needed, and disassembly and assembly are faster.

Description

Technical Field

[0001] The utility model belongs to the technical field of exhaust fans, and in particular relates to an exhaust fan. Background Art

[0002] An exhaust fan is an air conditioning appliance that uses a motor to drive the airflow by rotating the fan blades to exchange indoor and outdoor air. It is widely used in factories, gymnasiums, warehouses, kitchens and other places.

[0003] The existing exhaust fan includes a casing, fan blades and a motor. The fan blades and the motor are all installed in the casing. The fan blades are installed at one end of the motor shaft. The cold air generated by the rotation of the fan blades cannot dissipate the heat of the motor. The motor is prone to temperature rise and failure after running for a long time, which makes it difficult to meet the needs of long-term use. Summary of the invention

[0004] The utility model aims to solve the above-mentioned technical problems existing in the prior art and provides an exhaust fan with a novel structure. The servo motor drives the centrifugal fan wheel to rotate through the output shaft. While exhausting air, it can take away the heat on the surface of the servo motor to avoid the temperature rise effect, and the utility model is highly practical. The centrifugal fan wheel has a stable structure and reliable strength. Compared with the prior art, there is no need to perform the step-by-step operation of first connecting the wheel body and the fixed bracket and then connecting the fixed bracket and the output shaft, and disassembly and assembly are faster.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] An exhaust fan includes: a housing and a servo motor, an air duct is arranged in the housing, the servo motor is arranged in the air duct, and an air inlet and an air outlet are arranged on the housing; the characteristic is that: the output shaft of the servo motor is connected to a centrifugal wind wheel opposite to the air inlet, the servo motor is located in the cavity of the centrifugal wind wheel, the centrifugal wind wheel includes a wheel body and a fixed bracket, the fixed bracket is arranged in the wheel body, and the wheel body and the fixed bracket are an integrally formed structure. The exhaust fan has a novel structure, the servo motor drives the centrifugal wind wheel to rotate through the output shaft, and can take away the heat on the surface of the servo motor while exhausting air, avoiding the temperature rise effect, and has strong practicality; the centrifugal wind wheel has a stable structure and reliable strength. Compared with the prior art, there is no need to perform the step-by-step operation of first connecting the wheel body and the fixed bracket, and then connecting the fixed bracket and the output shaft, and the disassembly and assembly are faster.

[0007] Furthermore, a keyway corresponding to the output shaft is provided on the fixing bracket, and a nut is screwed on the output shaft, and the nut limits the fixing bracket from freely separating from the output shaft.

[0008] Furthermore, a positioning portion is provided on the output shaft, and the positioning portion cooperates with the nut to clamp the fixing bracket, thereby limiting the axial movement of the fixing bracket and improving the installation stability of the centrifugal wind wheel.

[0009] Furthermore, a reinforced convex portion is provided at the center of the fixed bracket, and a keyway is provided on the reinforced convex portion. The center of the fixed bracket is a stress concentration point, and the provision of the reinforced convex portion improves the structural strength of the center of the fixed bracket, has strong stress deformation resistance, and has a long service life.

[0010] Furthermore, the housing includes a front panel and a rear cover, the front panel and the rear cover are connected and fixed by screws, and the servo motor is fixed on the rear cover. The housing is a split structure, which is easy to manufacture, easy to disassemble and assemble, and convenient for repairing the servo motor.

[0011] Furthermore, the servo motor is provided with an outer ring plate, fastening bolts are passed through the outer ring plate, and a support is provided on the rear cover, and screw holes corresponding to the fastening bolts are provided on the support. The support supports the outer ring plate, ensuring the installation stability of the servo motor, reliable fixation, convenient disassembly and assembly, and can be used at any time, which is flexible and convenient.

[0012] Furthermore, the rear cover is connected to the pillar through the mesh ribs, which increases the contact area between the rear cover and the pillar, improves the installation strength of the pillar on the rear cover, and the connection between the two is not easy to crack, and the pillar is reliably fixed.

[0013] Furthermore, the front panel protrudes outward to form a positioning groove, which is matched with the front end of the rear cover. The front end of the rear cover is embedded in the positioning groove to achieve rapid positioning of the rear cover on the front panel, reduce the difficulty of hole alignment, and improve assembly efficiency.

[0014] Furthermore, the rear cover is provided with fixing ribs, which improve the structural strength of the rear cover, make it resistant to collision and not easily deformed, and have a long service life.

[0015] Furthermore, a mounting through hole is provided on the front panel, and screws are inserted into the mounting through hole to fix the front panel to a designated mounting surface, which is simple and convenient.

[0016] The utility model has the following beneficial effects due to the adoption of the above technical solution:

[0017] 1. The servo motor drives the centrifugal fan to rotate through the output shaft, which can take away the heat on the surface of the servo motor while exhausting air, avoiding the temperature rise effect and improving practicality.

[0018] 2. The wheel body and the fixed bracket are an integrated structure, which ensures the structural stability and reliable strength of the centrifugal wind wheel. Compared with the existing technology, there is no need to perform the step-by-step operation of first connecting the wheel body and the fixed bracket and then connecting the fixed bracket and the output shaft, and disassembly and assembly are faster.

[0019] 3. When installing the centrifugal wind wheel, cover the output shaft through the keyway so that the center of the fixed bracket is against the positioning part, and then install the nut on the output shaft so that the nut presses the fixed bracket. The positioning part cooperates with the nut to clamp the fixed bracket so that the fixed bracket is limited and fixed on the output shaft. The fixed bracket will not move axially or rotate radially, which ensures the installation stability of the centrifugal wind wheel. The centrifugal wind wheel is also easy to disassemble, clean and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings:

[0021] Figure 1 This is a structural schematic diagram of an exhaust fan of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the housing in the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the connection between the centrifugal wind wheel and the servo motor in the utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the centrifugal wind wheel in the utility model;

[0025] Figure 5 It is a structural schematic diagram of the connection between the rear cover and the servo motor in the utility model.

[0026] In the figure: 1-housing; 2-servo motor; 3-air duct; 4-air inlet; 5-air outlet; 6-centrifugal fan wheel; 7-output shaft; 8-wheel body; 9-fixing bracket; 10-positioning part; 11-keyway; 12-nut; 13-reinforced convex part; 14-front panel; 15-rear cover; 16-positioning groove; 17-mounting through hole; 18-reinforcement rib; 19-fixing rib; 20-outer ring plate; 21-pillar; 22-mesh rib. DETAILED DESCRIPTION

[0027] like Figure 1 and Figure 3 As shown, an exhaust fan of the utility model comprises: a shell 1 and a servo motor 2, an air duct 3 is provided in the shell 1, the servo motor 2 is arranged in the air duct 3, an air inlet 4 and an air outlet 5 are provided on the shell 1, the air inlet 4 and the air outlet 5 are both communicated with the air duct 3, the output shaft of the servo motor 2 is connected to a centrifugal wind wheel 6 opposite to the air inlet 4, and the servo motor 2 is located in the cavity of the centrifugal wind wheel 6.

[0028] The servo motor 2 drives the centrifugal fan wheel 6 to rotate via the output shaft 7, which can take away the heat on the surface of the servo motor 2 while exhausting air, avoiding the temperature rise effect and improving practicality.

[0029] like Figure 4As shown, the centrifugal wind wheel 6 includes a wheel body 8 and a fixed bracket 9. The fixed bracket 9 is arranged in the wheel body 8. The wheel body 8 and the fixed bracket 9 are an integrally formed structure. The two are connected as a whole, which ensures the structural stability and reliable strength of the centrifugal wind wheel 6. Compared with the prior art, there is no need to perform the step-by-step operation of first connecting the wheel body 8 and the fixed bracket 9 and then connecting the fixed bracket 9 and the output shaft 7, and disassembly and assembly are faster.

[0030] like Figure 5 As shown, a positioning portion 10 is provided on the output shaft 7 , a keyway 11 corresponding to the output shaft 7 is provided at the center of the fixing bracket 9 , and a nut 12 is screwed on the output shaft 7 .

[0031] When installing the centrifugal wind wheel 6, the output shaft 7 is sleeved through the keyway 11 so that the center of the fixed bracket 9 is against the positioning part 10, and then the nut 12 is installed on the output shaft 7 so that the nut 12 presses the fixed bracket 9. The positioning part 10 cooperates with the nut 12 to clamp the fixed bracket 9, so that the fixed bracket 9 is limited and fixed on the output shaft 7. The fixed bracket 9 will not move axially or rotate radially, thereby ensuring the installation stability of the centrifugal wind wheel 6. The centrifugal wind wheel 6 is also easy to disassemble, and is easy to clean and replace.

[0032] A reinforced convex portion 13 is provided at the center of the fixed bracket 9, and the keyway 11 is provided on the reinforced convex portion 13. The center of the fixed bracket 9 is a stress concentration point, and the arrangement of the reinforced convex portion 13 improves the structural strength of the center of the fixed bracket 9, has strong stress deformation resistance, and has a long service life.

[0033] like Figure 2 As shown, the housing 1 includes a front panel 14 and a rear cover 15, and the front panel 14 and the rear cover 15 are connected and fixed by screws. The housing 1 is a split structure, which is easy to manufacture and easy to disassemble and assemble, and is convenient for repairing the servo motor 2. The back of the front panel 14 protrudes outward to form a positioning groove 16, and the positioning groove 16 is adapted to the front end of the rear cover 15. The front end of the rear cover 15 is embedded in the positioning groove 16 to achieve rapid positioning of the rear cover 15 on the front panel 14, reducing the difficulty of hole alignment and high assembly efficiency.

[0034] The front panel 14 is provided with a mounting through hole 17 , and screws are inserted into the mounting through hole 17 to fix the front panel 14 to a designated mounting surface, which is simple and convenient.

[0035] The back of the front panel 14 is provided with reinforcing ribs 18 which are staggered in both horizontal and vertical directions. The reinforcing range is large and the reinforcing effect is good, thereby improving the structural strength of the front panel 14, making it resistant to impact and not easy to deform, and having a long service life.

[0036] The rear cover 15 is provided with fixing ribs 19, which improve the structural strength of the rear cover 15, make it resistant to collision and not easy to deform, and have a long service life.

[0037] The servo motor 2 is provided with an outer ring plate 20, and fastening bolts are passed through the outer ring plate 20. The rear cover 15 is provided with a support 21, and screw holes corresponding to the fastening bolts are provided on the support 21. The screw holes lock the fastening bolts, restricting the outer ring plate 20 from freely disengaging from the support 21, so that the servo motor 2 is fixed to the rear cover 15; the support 21 supports the outer ring plate 20, ensuring the installation stability of the servo motor 2, reliable fixation, convenient disassembly and assembly, and can be used at any time, which is flexible and convenient.

[0038] The rear cover 15 is connected to the support 21 through the mesh ribs 22, which increases the contact area between the rear cover 15 and the support 21, improves the installation strength of the support 21 on the rear cover 15, and the connection between the two is not easy to crack, and the support 21 is reliably fixed.

[0039] The above are only specific embodiments of the utility model, but the technical features of the utility model are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the utility model to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the utility model.

Claims

1. An exhaust fan, comprising: A housing and a servo motor, wherein an air duct is arranged in the housing, the servo motor is arranged in the air duct, and an air inlet and an air outlet are arranged on the housing; Features: The output shaft of the servo motor is connected to a centrifugal wind wheel opposite to the air inlet. The servo motor is located in a cavity of the centrifugal wind wheel. The centrifugal wind wheel includes a wheel body and a fixed bracket. The fixed bracket is arranged in the wheel body. The wheel body and the fixed bracket are an integrally formed structure.

2. The exhaust fan according to claim 1, characterized in that: The fixing bracket is provided with a keyway corresponding to the output shaft, and a nut is screwed on the output shaft, and the nut limits the fixing bracket from freely separating from the output shaft.

3. The exhaust fan according to claim 2, characterized in that: The output shaft is provided with a positioning portion, and the positioning portion cooperates with the nut to clamp the fixing bracket.

4. The exhaust fan according to claim 2, characterized in that: A reinforced convex portion is provided at the center of the fixing bracket, and the key slot is provided on the reinforced convex portion.

5. The exhaust fan according to claim 1, characterized in that: The housing comprises a front panel and a rear cover. The front panel and the rear cover are connected and fixed by screws, and the servo motor is fixed on the rear cover.

6. The exhaust fan according to claim 5, characterized in that: The servo motor is provided with an outer ring plate, and fastening bolts are passed through the outer ring plate. The rear cover is provided with a support column, and the support column is provided with screw holes corresponding to the fastening bolts.

7. The exhaust fan according to claim 6, characterized in that: The rear cover is connected to the pillars through mesh ribs.

8. The exhaust fan according to claim 5, characterized in that: The front panel protrudes outward to form a positioning groove, and the positioning groove is matched with the front end of the rear cover.

9. The exhaust fan according to claim 5, characterized in that: The rear cover is provided with fixing ribs.

10. The exhaust fan according to claim 5, characterized in that: The front panel is provided with a mounting through hole.

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