Fan for refrigerator

Abstract

The fan for the refrigerator comprises a wind wheel and a support, a rotating shaft is fixed to the center of the wind wheel in an injection molding mode, the circumferential wall of the rotating shaft is sleeved with a shaft sleeve, and the shaft sleeve is fixed in a mounting cavity of the support in an interference fit mode; a motor support is installed on the peripheral wall of the installation cavity, two lead strips are arranged at the end, close to the support, of the motor support, and the wire inlet end of a coil wound on the motor support is fixed to one lead strip in a wound mode, extends to a circuit board on the support and is fixed to the circuit board in a welded mode. The wire outlet end of the coil wound on the motor bracket is wound and fixed with the other lead strip, extends to the circuit board on the bracket and is welded and fixed; due to the fact that welding between the coil and the lead strip of the motor support and welding between the coil and the circuit board are both in flexible connection, the elastic space is large, vibration caused by high-speed rotation of the wind wheel cannot cause the risk of breakage, and the whole draught fan for the refrigerator is better in stability in the high-speed operation process.

Description

Technical Field

[0001] The invention belongs to the technical field of fans, and in particular relates to a fan for a refrigerator. Background Art

[0002] Existing air-cooled refrigerators all have centrifugal fans. Centrifugal fans are based on the principle of converting kinetic energy into potential energy. They use a high-speed rotating wind wheel to accelerate the gas, then slow down and change the flow direction, so that the kinetic energy is converted into potential energy (pressure). The wind wheel is in high-speed rotation during the conversion process, and the motor on the wind wheel provides the power for high-speed rotation. However, the high-speed rotation of the wind wheel will cause the vibration of the wind wheel bracket, and the wind wheel bracket is equipped with a circuit board. The existing motor bracket is wrapped with a coil, and the coil is welded and fixed to the pin needle on the motor bracket, and the pin needle is directly welded and fixed to the circuit board on the wind wheel bracket. In this way, there will be a rigid fixation without elastic space. The vibration caused by the high-speed rotation of the wind wheel will affect the vibration of the above structure, and cause the risk of breakage, resulting in the wind wheel not being able to work normally. In addition, the refrigerator is in a low-temperature state. The pin needle is a copper part, and the motor bracket is a plastic part. The fixation between the two may be detached from the fixed part under low-temperature conditions. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a refrigerator fan that is not affected by the vibration caused by the high-speed rotation of the wind wheel, thereby preventing the risk of breakage between the motor bracket and the circuit board.

[0004] The objective of the present invention is achieved through the following technical scheme. The refrigerator fan comprises a wind wheel and a bracket. A rotating shaft is fixed to the center of the wind wheel by injection molding. A shaft sleeve is sleeved on the circumferential wall of the rotating shaft, and the shaft sleeve is fixed in the mounting cavity of the bracket by interference fit. A motor bracket is mounted on the outer circumferential wall of the mounting cavity. Two lead bars are provided at the end of the motor bracket close to the bracket. The inlet end of the coil wound on the motor bracket is wound and fixed with one of the lead bars, and extends to the circuit board on the bracket and is welded and fixed. The outlet end of the coil wound on the motor bracket is wound and fixed with the other lead bar, and extends to the circuit board on the bracket and is welded and fixed.

[0005] The beneficial effects of the present invention are as follows: compared with the prior art, two lead bars are provided at the end of the motor bracket, and the input and output wire ends of the coil wound on the motor bracket are wound and fixed with the lead bars and extended to the circuit board on the bracket and welded and fixed; because the lead bars between the coil and the motor bracket and the welding between the coil and the circuit board are all soft connections, the elastic space is large, so the vibration caused by the high-speed rotation of the wind wheel will not cause the risk of breakage, so that the entire refrigerator fan has better stability during high-speed operation.

[0006] Preferably, the lead bar and the motor bracket are fixed by integral injection molding, and limiting blocks are integrally injection molded on both sides of the motor bracket on both sides of the lead bar, and the two limiting blocks are symmetrically distributed along the lead bar and form a mountain-shaped structure with the lead bar; the lead bar and the motor bracket are integrally injection molded, because the refrigerator fan is located in the refrigerator and is in a low temperature state, such an integral injection molding method will not cause the lead bar to separate from the motor bracket, the risk of breakage is greatly reduced, and the stability is better.

[0007] Preferably, a circle of oil storage grooves is provided on the circumferential wall of the rotating shaft, and the oil storage grooves and the inner wall of the sleeve form an annular oil storage cavity, and the oil storage cavity is located at the axial center of the sleeve; because the wind wheel is in high-speed rotation, there is high-speed friction between the rotating shaft and the sleeve, which will generate heat. Through the setting of the above structure, the lubrication performance between the rotating shaft and the sleeve is better, and the operation stability is better.

[0008] Preferably, the inner wall of the sleeve is provided with a circle of step surface, and the step surface covers the oil storage tank. The height of the step surface is greater than the height of the oil storage tank, and the oil storage tank is located at the center of the step surface in the height direction. By providing a circle of step surface on the inner wall of the sleeve, the lubricating oil in the oil storage tank can flow into the gap between the step surface and the circumferential wall of the rotating shaft, and slowly penetrate into between the sleeve and the rotating shaft, thereby achieving better lubrication.

[0009] Preferably, a first step groove is provided at the upper end of the inner circumferential wall of the mounting cavity of the bracket, the bottom surface of the first step groove is flush with the top surface of the bushing, and bearings are placed on the first step groove and the top surface of the bushing, and the upper end of the outer ring of the bearing is limited and fixed by a fixing frame provided at the upper end of the motor bracket; by providing the bearing, not only the axial looseness of the bushing and the mounting cavity of the bracket is solved, but also the stability of the bearing during high-speed operation can be achieved. Because the connection between the bearing and the wind wheel will shake greatly during high-speed operation of the wind wheel, the shaking problem can be prevented by providing the bearing.

[0010] Preferably, the cross-section of the radial inner wall of the inner ring of the bearing is angular and faces the outer circumferential wall of the rotating shaft, and the two are in conflict with each other; through the shape setting of the above-mentioned bearing inner ring, not only the shaking problem is solved, but also the friction contact area between the bearing and the rotating shaft is made smaller, and the problem of lubricating oil overflow can be prevented.

[0011] Preferably, a second step groove is provided at the lower end of the inner circumferential wall of the mounting cavity of the bracket, an oil stop plate is installed on the second step groove, the upper end surface of the oil stop plate is in conflict with the bottom plane of the sleeve, and the oil stop plate is embedded in the circumferential groove of the rotating shaft; by setting the oil stop plate, the problem of lubricating oil overflow can be prevented.

[0012] Preferably, the oil stop plate is an annular plate-shaped body, and expansion gaps distributed in a cross pattern are provided along the radial direction of the oil stop plate; through the arrangement of the above structure, the disassembly and assembly between the oil stop plate and the circumferential groove of the rotating shaft is more convenient.

[0013] Preferably, a stepped groove is provided on the inner side of the upper end surface of the sleeve, and an oblique groove is provided on the upper end surface of the sleeve in contact with the rotating shaft, and the oblique groove is connected to the stepped groove; through the arrangement of the above structure, the end surface contact area between the sleeve and the bearing is smaller, and it is not easy to generate heat, and it is convenient to disassemble and assemble the sleeve, that is, the disassembly and assembly between the sleeve and the mounting cavity can be achieved through the stepped groove by special tools, and the oblique groove is provided to facilitate the addition of lubricating oil into the oil storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the refrigerator fan of the present invention.

[0015] Figure 2 It is a schematic diagram of the front cross-sectional structure of the refrigerator fan of the present invention.

[0016] Figure 3 It is a schematic diagram of the structure between the bracket and the motor bracket of the present invention.

[0017] Figure 4 It is a schematic diagram of the motor bracket structure of the present invention.

[0018] Figure 5 yes Figure 2 A is an enlarged structural diagram of FIG.

[0019] The numbers in the accompanying drawings are: 1. wind wheel; 2. bracket; 3. rotating shaft; 4. bushing; 5. motor bracket; 6. oil storage chamber; 7. bearing; 8. oil stop plate; 21. mounting chamber; 22. circuit board; 23. first step groove; 24. second step groove; 31. oil storage tank; 32. circumferential groove; 41. step surface; 42. step groove; 43. oblique groove; 51. lead wire; 52. limit block; 53. fixing frame; 81. expansion gap. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings: Figures 1 to 5As shown, the present invention includes a wind wheel 1 and a bracket 2, the center of the wind wheel 1 is fixed with a rotating shaft 3 by injection molding, the circumferential wall of the rotating shaft 3 is sleeved with a shaft sleeve 4, and the shaft sleeve 4 is fixed in the mounting cavity 21 of the bracket 2 by interference fit; a motor bracket 5 is installed on the outer circumferential wall of the mounting cavity 21, and two lead bars 51 are provided at the end of the motor bracket 5 close to the bracket 2, and the inlet end of the coil wound on the motor bracket 5 is wound and fixed with one of the lead bars 51, and extends to the circuit board 22 on the bracket 2 and is welded and fixed, and the outlet end of the coil wound on the motor bracket 5 is wound and fixed with the other lead bar 51, and extends to the circuit board 22 on the bracket 2 and is welded and fixed.

[0021] The lead bar 51 and the motor bracket 5 are fixed by integral injection molding, and limiting blocks 52 are integrally injection molded on both sides of the motor bracket 5 located on both sides of the lead bar 51, and the two limiting blocks 52 are symmetrically distributed along the lead bar 51 and form a mountain-shaped structure with the lead bar 51.

[0022] A circle of oil storage grooves 31 are provided on the circumferential wall of the rotating shaft 3, and the oil storage grooves 31 and the inner wall of the sleeve 4 form an annular oil storage cavity 6, and the oil storage cavity 6 is located at the axial center of the sleeve 4; the inner wall of the sleeve 4 is provided with a circle of step surfaces 41, and the circle of step surfaces 41 is covered on the oil storage grooves 31, and the height of the step surfaces 41 is greater than the height of the oil storage grooves 31, and the oil storage grooves 31 are located at the center of the step surfaces 41 in the height direction.

[0023] A first step groove 23 is provided at the upper end of the inner circumferential wall of the mounting cavity 21 of the bracket 2, the bottom surface of the first step groove 23 is flush with the top surface of the sleeve 4, and a bearing 7 is placed on the first step groove 23 and the top surface of the sleeve 4, and the upper end of the outer ring of the bearing 7 is limited and fixed by a fixing frame 53 provided at the upper end of the motor bracket 5; the cross-section of the radial inner wall of the inner ring of the bearing 7 is angular and faces the outer circumferential wall of the rotating shaft 3, and the two are in conflict with each other.

[0024] A second step groove 24 is provided at the lower end of the inner circumferential wall of the mounting cavity 21 of the bracket 2, and an oil stop plate 8 is installed on the second step groove 24. The upper end surface of the oil stop plate 8 is in conflict with the bottom plane of the sleeve 4, and the oil stop plate 8 is embedded in the circumferential groove 32 of the rotating shaft 3; the oil stop plate 8 is an annular plate-shaped body, and expansion gaps 81 distributed in a cross shape are provided along the radial direction of the oil stop plate 8.

[0025] A stepped groove 42 is provided on the inner side of the upper end surface of the shaft sleeve 4 , and an oblique groove 43 is provided on the upper end surface of the shaft sleeve 4 contacting the rotating shaft 3 , and the oblique groove 43 is connected to the stepped groove 42 .

[0026] During use of the present invention, the entire fan is horizontally installed in the refrigerator's refrigerating chamber through the bracket 2. Generally, the wind blown out by the wind wheel 1 is directed toward the refrigerator door. At this time, the lubricating oil in the oil storage chamber 6, driven by the high-speed rotating shaft 3, will lubricate the gap between the entire rotating shaft 3 and the sleeve 4.

[0027] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A fan for a refrigerator, comprising a fan wheel (1) and a bracket (2), characterized in that: A rotating shaft (3) is fixed at the center of the wind wheel (1) by injection molding, a shaft sleeve (4) is sleeved on the circumferential wall of the rotating shaft (3), and the shaft sleeve (4) is fixed in the mounting cavity (21) of the bracket (2) by interference fit; a motor bracket (5) is mounted on the outer circumferential wall of the mounting cavity (21), two lead bars (51) are provided at the end of the motor bracket (5) close to the bracket (2), and an inlet end of a coil wound on the motor bracket (5) is wound and fixed with one of the lead bars (51), and extends to and is welded to a circuit board (22) on the bracket (2), and an outlet end of a coil wound on the motor bracket (5) is wound and fixed with another lead bar (51), and extends to and is welded to a circuit board (22) on the bracket (2).

2. The refrigerator fan according to claim 1, characterized in that: The lead bar (51) and the motor bracket (5) are fixed by integral injection molding, and limiting blocks (52) are integrally injection molded on both sides of the motor bracket (5) located on both sides of the lead bar (51), and the two limiting blocks (52) are symmetrically distributed along the lead bar (51) and form a mountain-shaped structure with the lead bar (51).

3. The refrigerator fan according to claim 1, characterized in that: A circle of oil storage grooves (31) are provided on the circumferential wall of the rotating shaft (3), and the oil storage grooves (31) and the inner wall of the shaft sleeve (4) form an annular oil storage cavity (6), and the oil storage cavity (6) is located at the axial center of the shaft sleeve (4).

4. The refrigerator fan according to claim 3, characterized in that: The inner wall of the shaft sleeve (4) is provided with a circle of stepped surface (41), and the circle of the stepped surface (41) covers the oil storage groove (31). The height of the stepped surface (41) is greater than the height of the oil storage groove (31), and the oil storage groove (31) is located at the exact center of the stepped surface (41) in the height direction.

5. The refrigerator fan according to claim 1, characterized in that: A first step groove (23) is provided at the upper end of the inner circumferential wall of the mounting cavity (21) of the bracket (2), the bottom surface of the first step groove (23) is flush with the top surface of the shaft sleeve (4), and a bearing (7) is placed on the first step groove (23) and the top surface of the shaft sleeve (4), and the upper end of the outer ring of the bearing (7) is limited and fixed by a fixing frame (53) provided at the upper end of the motor bracket (5).

6. The refrigerator fan according to claim 5, characterized in that: The cross section of the radial inner wall of the inner ring of the bearing (7) is angular and faces the outer circumferential wall of the rotating shaft (3), and the two are in conflict with each other.

7. The refrigerator fan according to claim 1, characterized in that: A second step groove (24) is provided at the lower end of the inner circumferential wall of the mounting cavity (21) of the bracket (2), an oil stop plate (8) is installed on the second step groove (24), the upper end surface of the oil stop plate (8) is in contact with the bottom plane of the shaft sleeve (4), and the oil stop plate (8) is embedded in the circumferential groove (32) of the rotating shaft (3).

8. The refrigerator fan according to claim 7, characterized in that: The oil stop plate (8) is an annular plate-shaped body, and expansion gaps (81) distributed in a cross-like manner are provided along the radial direction of the oil stop plate (8).

9. The refrigerator fan according to claim 1, characterized in that: A stepped groove (42) is provided on the inner side of the upper end surface of the shaft sleeve (4), and an oblique groove (43) is provided on the upper end surface of the shaft sleeve (4) in contact with the rotating shaft (3), and the oblique groove (43) is connected to the stepped groove (42).

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