High-precision equipment to adjust planetary reducer

Abstract

The present invention discloses a planetary reducer for adjusting high-precision equipment, including: a protective shell; an anti-intrusion component, the anti-intrusion component is used to prevent external dust and foreign matter from invading the interior of the protective shell, and the anti-intrusion component includes a blowing member. The present invention sends air into two air supply pipes through an air pump, and the air flow is discharged through two annular porous air ducts. Under the guidance of the annular air guide plate to the air flow, the air flow blows open the two closed first arc cover plates and the two second arc cover plates, and blows air to the outer ends of the output shaft and the input shaft, forming a certain air flow pressure in the blowing direction, which helps to prevent external dust and foreign matter from invading the interior of the reducer, thereby protecting the internal components of the reducer, preventing foreign matter from obstructing the normal meshing of gears (i.e., sun gears, planetary gears, and ring gears) to cause accelerated wear, and improving service life and transmission efficiency. At the same time, it can dissipate heat from the output shaft and the input shaft.

Description

Technical Field

[0001] The invention relates to the technical field of planetary reducers, and in particular to a planetary reducer for high-precision equipment adjustment. Background Art

[0002] Planetary reducer is a kind of deceleration device widely used in mechanical transmission systems. It uses planetary gear structure to reduce input speed and increase output torque. In industrial robots and collaborative robots, planetary reducers are used to drive joints to provide high precision and high torque. In automation equipment, such as conveyor belts, elevators and other equipment, where speed and force need to be precisely controlled, in power tools, planetary reducers are used to increase torque output. In the gearbox of wind turbines, it is used to reduce the speed of fast-rotating wind wheels and increase torque. Planetary reducers are widely used in various industrial fields due to their superior performance, compact structure and easy maintenance.

[0003] Once the sealing rings installed at the input and output ends of the planetary reducer are worn or aged, dust and foreign matter in the environment surrounding the reducer will penetrate into the reducer through the gap in the inner ring of the sealing ring. After foreign matter (such as particles, dust, metal chips, etc.) enters the reducer, it will produce friction with the internal gears, hindering the normal meshing of the gears, causing accelerated gear wear, affecting its service life and transmission efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a high-precision equipment to adjust the planetary reducer, which solves the problem that once the sealing rings arranged at the input and output ends of the traditional planetary reducer are worn or aged, dust and foreign matter from the surrounding environment will penetrate into the reducer. After the foreign matter (such as particles, dust, metal chips, etc.) enters, it will produce friction with the internal gears, hindering the normal meshing of the gears, causing accelerated wear of the gears, and affecting their service life and transmission efficiency.

[0005] The present invention solves the above technical problems through the following technical solutions, which include:

[0006] Protective housing;

[0007] An anti-intrusion component, the anti-intrusion component is used to prevent external dust and foreign matter from intruding into the protective shell, the anti-intrusion component includes a blowing member, the blowing member includes an air pump, two air supply pipes, two annular porous air pipes, two annular air guide plates, two first arc-shaped cover plates and two second arc-shaped cover plates;

[0008] One end of the two air supply pipes is fixed to the air outlet end of the air pump, and the other end of the two air supply pipes extends to the inner side of the protective shell. The ends of the two air supply pipes extending to the inner side of the protective shell are respectively connected to the two annular porous air ducts, and the two annular air guide plates are fixed to the inner side of the protective shell. The two first arc-shaped cover plates and the two second arc-shaped cover plates are respectively hinged on both sides of the protective shell.

[0009] Preferably, the anti-intrusion component further comprises an anti-blocking member, which is arranged outside the protective shell and is used to prevent the air pump from being blocked by dust and other foreign matter in the internal flow channel or valve.

[0010] Preferably, the anti-blocking member includes an annular frame, which is fixed to the outside of the protective shell, an inner cavity is opened inside the annular frame, the air pump is fixed inside the inner cavity, an annular filter is rotatably installed on the inner side of the annular frame, a bracket is fixed to the outer side of the annular filter, and a dust sweeping strip is fixed to the inner side of the annular frame.

[0011] Preferably, a reduction assembly is disposed inside the protective shell, and the reduction assembly is used to convert an input high rotation speed into an output low rotation speed.

[0012] Preferably, the reduction assembly comprises an input shaft, a sun gear, three planetary gears, a ring gear, a planet carrier and an output shaft;

[0013] The sun gear is fixed to one end of the input shaft, the ring gear is fixed to the inside of the protective housing, the three planetary gears are all meshed with the tooth surface inside the ring gear, the three planetary gears are all meshed with the sun gear, the planet carrier rotates inside the protective housing, one side of the three planetary gears are all rotated on one side of the planet carrier through a connecting shaft, one end of the output shaft is fixed to the other side of the planet carrier, the other end of the output shaft extends to the outside of the protective housing, and the bracket is fixed to the outside of the output shaft.

[0014] Preferably, a first cooling groove is opened on one side of the sun gear, a second cooling groove is opened on one side of the three planetary gears, and a cooling component is arranged inside the protective shell, and the cooling component is used to control the temperature of the sun gear, the planetary gears and the ring gear during operation.

[0015] Preferably, the cooling component includes a first annular cooling shell, which is inserted into the interior of the first cooling tank, three water inlet connecting arms are fixed to the outside of the first annular cooling shell, one end of the three water inlet connecting arms is fixed to a second annular cooling shell, the three second annular cooling shells are respectively inserted into the interiors of the three second cooling tanks, one side of the three second annular cooling shells is fixed with a return water connecting arm, one side of the first annular cooling shell is provided with a first rotating joint, one side of the first rotating joint is provided with a second rotating joint, one end of the three return water connecting arms is connected to the second rotating joint, one side of the second rotating joint is provided with a third rotating joint, a return water pipe is provided inside the third rotating joint, a water inlet fixed pipe is provided inside the third rotating joint, and one end of the water inlet fixed pipe extends to the interior of the first rotating joint.

[0016] Preferably, the cooling component also includes a refrigeration shell, in which a semiconductor refrigeration plate and a water pump are fixed, a water outlet end of the water pump is fixedly connected to one end of the water inlet fixed pipe, and one end of the return pipe extends to the interior of the refrigeration shell.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. Air is sent into two air supply pipes through an air pump, and the air flow is discharged through two annular porous air ducts. Under the guidance of the annular air guide plate, the air flow blows open the two closed first arc cover plates and the two second arc cover plates, and blows air to the outer ends of the output shaft and the input shaft, forming a certain air flow pressure in the blowing direction, which helps to prevent external dust and foreign matter from invading the reducer, thereby protecting the internal components of the reducer, avoiding foreign matter from hindering the normal meshing of gears (i.e., sun gears, planetary gears and ring gears) and causing accelerated wear, thereby improving service life and transmission efficiency, and at the same time being able to dissipate heat to the output shaft and the input shaft.

[0019] 2. Through the operation of the water pump, the water source in the first annular cooling shell and the second annular cooling shell will realize cold water circulation through the water inlet connecting arm, the return water connecting arm, the first rotating joint, the second rotating joint, the third rotating joint, the return water pipe and the water inlet fixed pipe, effectively cooling down the heat generated during the operation of the sun gear, the planetary gear and the ring gear, and avoiding the phenomenon that the lubricating oil on the sun gear, the planetary gear and the ring gear is degraded due to overheating and accelerated wear of components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the splitting of the present invention;

[0022] Figure 3 for Figure 2 The enlarged schematic diagram of the middle A part;

[0023] Figure 4 is a cross-sectional view of the present invention;

[0024] Figure 5 for Figure 4 The enlarged schematic diagram of the middle part B;

[0025] Figure 6 It is a partial split cross-sectional view of the cooling component in the present invention;

[0026] Figure 7 for Figure 6 The enlarged schematic diagram of the middle C part;

[0027] Figure 8 for Figure 6 Enlarged schematic diagram of part D in the middle.

[0028] 1. Protective shell;

[0029] 2. Anti-intrusion assembly; 21. Air pump; 22. Air supply pipe; 23. Annular porous air pipe; 24. Annular air guide plate; 25. First arc-shaped cover plate; 26. Second arc-shaped cover plate; 27. Annular frame; 28. Inner cavity; 29. ​​Annular filter; 210. Bracket; 211. Dust sweeping strip;

[0030] 3. Speed ​​reduction assembly; 31. Input shaft; 32. Sun gear; 33. Planetary gear; 34. Ring gear; 35. Planet carrier; 36. Output shaft;

[0031] 4. The first cooling tank; 5. The second cooling tank;

[0032] 6. Cooling assembly; 61. First annular cooling shell; 62. Water inlet connecting arm; 63. Second annular cooling shell; 64. Return water connecting arm; 65. First rotating joint; 66. Second rotating joint; 67. Third rotating joint; 68. Return water pipe; 69. Water inlet fixed pipe; 610. Refrigeration shell; 611. Semiconductor refrigeration sheet; 612. Water pump. DETAILED DESCRIPTION

[0033] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0034] The present invention provides a technical solution: high-precision equipment adjusts the planetary reducer, such as Figure 1 , Figure 2 , Figure 4 and Figure 6As shown, it includes a protective shell 1, an anti-intrusion component 2, a reduction component 3 and a cooling component 6. The reduction component 3 is arranged inside the protective shell 1, and is used to convert the input high speed into the output low speed. The reduction component 3 includes an input shaft 31, a sun gear 32, three planetary gears 33, a ring gear 34, a planet carrier 35 and an output shaft 36. The input shaft 31 and the output shaft 36 are respectively located on both sides of the protective shell 1. The input shaft 31 is connected to the motor, and the motor provides power for it. The sun gear 32 is fixed to one end of the input shaft 31, and bearings are provided on the outside of the input shaft 31 and the outside of the output shaft 36. The bearings play important roles such as support, positioning, and reducing friction. The ring gear 34 is fixed to the inside of the protective shell 1, and the three planetary gears 33 are all meshed with the tooth surface on the inner side of the ring gear 34. The three planetary gears 33 are all meshed with the sun gear 32. Figure 2 As shown, the sun gear 32 and the three planetary gears 33 are all on the inner side of the ring gear 34. The sun gear 32 is located at the center of the ring gear 34, and the three planetary gears 33 are arranged in a ring shape and equidistantly on the periphery of the sun gear 32. The planet carrier 35 rotates inside the protective housing 1, and one side of the three planetary gears 33 rotates on one side of the planet carrier 35 through a connecting shaft. One end of the output shaft 36 is fixed to the other side of the planet carrier 35, and the other end of the output shaft 36 extends to the outside of the protective housing 1. The bracket 210 is fixed to the outside of the output shaft 36. Inside the protective housing 1, sealing rings are provided at positions corresponding to the output shaft 36 and the input shaft 31. The sealing rings have the functions of preventing lubricating oil leakage, dirt entry, and maintaining internal pressure.

[0035] like Figure 1 and Figure 2 As shown, the anti-intrusion component 2 is arranged on both sides of the protective housing 1. The sealing rings installed at the output shaft 36 and the input shaft 31 will wear or age with the use time, resulting in a decrease in the sealing effect, so that tiny foreign matter can penetrate into the reducer from the inside of the sealing ring. During rotation or vibration, the worn sealing ring may produce a larger gap, allowing external impurities to enter. The anti-intrusion component 2 is used to prevent external dust and foreign matter from invading the interior of the protective housing 1, which can significantly reduce the wear and tear of key components such as gears and bearings and the resulting jamming, thereby extending the service life of the equipment, and helping to ensure the normal operation of the lubrication system, thereby maintaining a good lubrication state and maintaining its efficient operation. By blowing air to the outside of the output shaft 36 and the input shaft 31, a certain airflow pressure can be formed, which helps to prevent external dust and foreign matter from invading the interior of the reducer, thereby protecting the internal components of the reducer, and at the same time dissipating the heat of the output shaft 36 and the input shaft 31.

[0036] like Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, the anti-intrusion component 2 includes a blowing member, which includes an air pump 21, two air supply pipes 22, two annular porous air pipes 23, two annular air guide plates 24, two first arc-shaped cover plates 25 and two second arc-shaped cover plates 26. One end of the two air supply pipes 22 is fixed to the air outlet end of the air pump 21, and the air pump 21 evenly delivers the drawn air to the two air supply pipes 22. The other ends of the two air supply pipes 22 extend to the inner side of the protective shell 1 and are respectively located near the side edges of the protective shell 1. One end of the two air supply pipes 22 extending to the inner side of the protective shell 1 is respectively connected to the two annular porous air pipes 23, and the two annular air guide plates 24 are fixed to the inner side of the protective shell 1. The two annular air guide plates 24 are used to control the wind direction of the outlet air. In order to guide the air flow to the direction where the dust has infiltrated and effectively blow away the dust, the two first arc cover plates 25 and the two second arc cover plates 26 are respectively hinged on both sides of the protective shell 1. When the planetary reducer is not working, the two first arc cover plates 25 and the two second arc cover plates 26 are in a closed state. The two first arc cover plates 25 and the two second arc cover plates 26 are fixed to the protective shell 1 on the side close to the protective shell 1 by the suction force of the magnetic strip. When the annular porous air duct 23 blows air, the two first arc cover plates 25 and the two second arc cover plates 26 are blown open. When the wind speed stops, the two first arc cover plates 25 and the two second arc cover plates 26 are closed again by magnetic attraction.

[0037] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the anti-intrusion component 2 also includes an anti-blocking member, which is arranged on the outside of the protective shell 1. The anti-blocking member is used to prevent the air pump 21 from being blocked by dust and other foreign matter in the internal flow channel or valve. The anti-blocking member includes an annular frame 27, which is fixed to the outside of the protective shell 1. An inner cavity 28 is opened inside the annular frame 27. The air pump 21 is fixed inside the inner cavity 28. An annular filter 29 is rotatably installed on the inner side of the annular frame 27. The air inlet end of the air pump 21 is located inside the annular filter 29. The annular filter 29 Dust and foreign matter in the air are filtered to prevent dust and foreign matter from entering the air pump 21 and causing the air pump 21 to be blocked and unable to be used normally. A bracket 210 is fixed to the outside of the annular filter 29, and the bracket 210 is fixed to the outside of the output shaft 36. A dust sweeping strip 211 is fixed to the inside of the annular frame 27. During the operation of the output shaft 36, the annular filter 29 will be directly driven to rotate slowly. The annular filter 29 continuously changes the position of filtering air during rotation, and dust and foreign matter are swept off the annular filter 29 when passing through the dust sweeping strip 211.

[0038] like Figure 2 , Figure 4 Figure 6As shown, a first cooling groove 4 is provided on one side of the sun gear 32, and a second cooling groove 5 is provided on one side of each of the three planetary gears 33. A cooling component 6 is arranged inside the protective shell 1 to control the working temperature of the sun gear 32, the planetary gears 33 and the ring gear 34. During the working rotation of the sun gear 32, the planetary gears 33 and the ring gear 34, they will gradually generate heat. High temperature will cause the mechanical properties of the gear material to decrease, reduce its strength and hardness, and increase the risk of deformation. At the same time, excessive temperature will cause the degradation of the lubricating oil, reduce its lubrication performance, increase the friction and wear between the sun gear 32, the planetary gears 33 and the ring gear 34, shorten the service life of the reducer, and affect the operating stability.

[0039] like Figure 5-8 As shown, the cooling component 6 includes a first annular cooling shell 61, which is plugged into the interior of the first cooling tank 4, three water inlet connecting arms 62 are fixed to the outside of the first annular cooling shell 61, one end of the three water inlet connecting arms 62 are fixed to the second annular cooling shell 63, the three second annular cooling shells 63 are respectively plugged into the interior of the three second cooling tanks 5, one side of the three second annular cooling shells 63 are fixed to the return water connecting arm 64, one side of the first annular cooling shell 61 is provided with a first rotating joint 65, one side of the first rotating joint 65 is provided with a second rotating joint 66, one end of the three return water connecting arms 64 are connected to the second rotating joint 66, one side of the second rotating joint 66 is provided with a third rotating joint 67, the first annular cooling shell 61, the first rotating joint 65, and the second The rotating joint 66 and the third rotating joint 67 are both sleeved on the outside of the input shaft 31. A return pipe 68 is arranged inside the third rotating joint 67. A water inlet fixed pipe 69 is arranged inside the third rotating joint 67. One end of the water inlet fixed pipe 69 extends to the inside of the first rotating joint 65. Due to the fixation of the position of the return pipe 68, the third rotating joint 67 remains in a non-rotating state. The water inlet fixed pipe 69 stabilizes the first rotating joint 65 through the stability of the third rotating joint 67 and will not rotate with the first annular cooling shell 61. The cooling component 6 also includes a refrigeration shell 610. A semiconductor refrigeration plate 611 and a water pump 612 are fixed inside the refrigeration shell 610. The water outlet end of the water pump 612 is fixedly connected to one end of the water inlet fixed pipe 69, and one end of the return pipe 68 extends to the inside of the refrigeration shell 610.

[0040] When in use, when the planetary reducer is running, the air pump 21, the semiconductor refrigeration plate 611 and the water pump 612 are all started to work, and the input shaft 31 is connected to a power source such as an electric motor or an internal combustion engine. When the input shaft 31 rotates, the power is transmitted to the sun gear 32, and the sun gear 32 rotates to push the planetary gear 33. Due to the engagement between the planetary gear 33 and the sun gear 32, the planetary gear 33 will rotate around the concentrated sun gear 32 and also rotate on its own. As the planetary gear 33 rotates, the planetary carrier 35 also rotates and drives the output shaft 36 to rotate at the same speed, but its speed will be lower than the sun gear 32, thereby achieving deceleration.

[0041] The air pump 21 delivers the air filtered by the annular filter 29 to the annular porous air duct 23 through the air supply pipe 22. Under the guidance of the air flow by the annular air guide plate 24, the air flow blows open the two closed first arc cover plates 25 and the two second arc cover plates 26, and blows air to the outer ends of the output shaft 36 and the input shaft 31, so as to form a certain air flow pressure at the gap between the output shaft 36 and the input shaft 31 and the protective shell 1, which helps to prevent external dust and foreign matter from invading the interior of the reducer, thereby protecting the internal components of the reducer, and at the same time, it can dissipate heat for the output shaft 36 and the input shaft 31. At the same time, the output shaft 36 drives the annular filter 29 to rotate differently through the bracket 210, changes the filtering position, and sweeps off the dust and foreign matter on the outside of the annular filter 29 through the dust sweeping strip 211 during the rotation, so as to avoid clogging of the annular filter 29 and affecting the filtering effect and the ventilation effect.

[0042] When the water pump 612 is running, the water source in the first annular cooling shell 61 and the second annular cooling shell 63 will realize water circulation through the water inlet connecting arm 62, the return water connecting arm 64, the first rotating joint 65, the second rotating joint 66, the third rotating joint 67, the return water pipe 68 and the water inlet fixed pipe 69. During the water source circulation process, the water source is cooled by the semiconductor refrigeration plate 611 in the refrigeration shell 610 to keep the water source at a low temperature, so as to effectively and quickly cool down the heat generated during the operation of the sun gear 32, the planetary gear 33 and the ring gear 34, and avoid the overheating of the lubricating oil on the sun gear 32, the planetary gear 33 and the ring gear 34, resulting in oil degradation and accelerated component wear. When the planetary gear 33 and the sun gear 32 rotate, the planetary gear 33 will drive the second annular cooling shell 63 in the second cooling tank 5 to rotate around the sun gear 32 together with it, and the second annular cooling shell 63 will drive the first annular cooling shell 61 to rotate through the water inlet connecting arm 62, and drive the second rotary joint 66 to rotate through the return water connecting arm 64. When the first annular cooling shell 61, the second annular cooling shell 63, the water inlet connecting arm 62, the return water connecting arm 64 and the second rotary joint 66 rotate, they are fixed by the return water pipe 68 and the water inlet fixed pipe 69, and the third rotary joint 67 and the first rotary joint 65 remain stationary and will not affect the delivery and output of the water source.

[0043] The above description is only a preferred embodiment of the present invention, which is only illustrative and not restrictive of the present invention. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims of the present invention, but all of them will fall within the scope of protection of the present invention.

Claims

1. High-precision equipment to adjust the planetary reducer, characterized in that: include: Protective housing (1); An anti-intrusion component (2), the anti-intrusion component (2) being used to prevent external dust and foreign matter from intruding into the interior of the protective housing (1), the anti-intrusion component (2) comprising an air blowing member, the air blowing member comprising an air pump (21), two air supply pipes (22), two annular porous air pipes (23), two annular air guide plates (24), two first arc-shaped cover plates (25), and two second arc-shaped cover plates (26); One end of the two air supply pipes (22) is fixed to the air outlet end of the air pump (21), the other end of the two air supply pipes (22) extends to the inner side of the protective shell (1), the ends of the two air supply pipes (22) extending to the inner side of the protective shell (1) are respectively connected to the two annular porous air pipes (23), the two annular air guide plates (24) are fixed to the inner side of the protective shell (1), and the two first arc-shaped cover plates (25) and the two second arc-shaped cover plates (26) are respectively hinged to the two sides of the protective shell (1); The anti-intrusion component (2) further comprises an anti-blocking member, the anti-blocking member being arranged outside the protective shell (1), the anti-blocking member being used to prevent the air pump (21) from being blocked by dust or other foreign matter in the internal flow channel or valve, the anti-blocking member comprising an annular frame (27), the annular frame (27) being fixed to the outside of the protective shell (1), an inner cavity (28) being provided inside the annular frame (27), the air pump (21) being fixed inside the inner cavity (28), an annular filter (29) being rotatably mounted inside the annular frame (27), a bracket (210) being fixed outside the annular filter (29), and a dust sweeping strip (211) being fixed inside the annular frame (27); A reduction assembly (3) is disposed inside the protective housing (1), and the reduction assembly (3) is used to convert an input high rotation speed into an output low rotation speed, and the reduction assembly (3) comprises an input shaft (31), a sun gear (32), three planetary gears (33), a ring gear (34), a planet carrier (35), and an output shaft (36); The sun gear (32) is fixed to one end of the input shaft (31), the ring gear (34) is fixed to the inside of the protective housing (1), the three planetary gears (33) are all meshed with the tooth surface on the inner side of the ring gear (34), the three planetary gears (33) are all meshed with the sun gear (32), the planet carrier (35) rotates inside the protective housing (1), one side of the three planetary gears (33) is rotated on one side of the planet carrier (35) through a connecting shaft, one end of the output shaft (36) is fixed to the other side of the planet carrier (35), the other end of the output shaft (36) extends to the outside of the protective housing (1), and the bracket (210) is fixed to the outside of the output shaft (36).

2. The high-precision equipment adjustment planetary reducer according to claim 1, characterized in that: A first cooling groove (4) is provided on one side of the sun gear (32), a second cooling groove (5) is provided on one side of each of the three planetary gears (33), and a cooling component (6) is provided inside the protective housing (1). The cooling component (6) is used to control the temperature of the sun gear (32), the planetary gears (33) and the ring gear (34) when they are in operation.

3. The high-precision equipment adjustment planetary reducer according to claim 2, characterized in that: The cooling assembly (6) comprises a first annular cooling shell (61), the first annular cooling shell (61) being plugged into the interior of the first cooling groove (4), three water inlet connecting arms (62) being fixed to the exterior of the first annular cooling shell (61), one end of each of the three water inlet connecting arms (62) being fixed with a second annular cooling shell (63), the three second annular cooling shells (63) being respectively plugged into the interior of the three second cooling grooves (5), one side of each of the three second annular cooling shells (63) being fixed with a water return connecting arm (64), the first annular cooling shell (61) ) is provided with a first rotating joint (65) on one side, a second rotating joint (66) is provided on one side of the first rotating joint (65), one end of each of the three return water connecting arms (64) is connected to the second rotating joint (66), a third rotating joint (67) is provided on one side of the second rotating joint (66), a return water pipe (68) is provided inside the third rotating joint (67), a water inlet fixed pipe (69) is provided inside the third rotating joint (67), and one end of the water inlet fixed pipe (69) extends to the interior of the first rotating joint (65).

4. The high-precision equipment adjustment planetary reducer according to claim 3, characterized in that: The cooling component (6) further comprises a refrigeration shell (610), wherein a semiconductor refrigeration plate (611) and a water pump (612) are fixed inside the refrigeration shell (610), wherein a water outlet end of the water pump (612) is fixedly connected to one end of the water inlet fixed pipe (69), and one end of the water return pipe (68) extends to the interior of the refrigeration shell (610).

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