CN220522740U - Double-head pump - Google Patents

Abstract

The utility model discloses a double-ended pump, comprising: the motor comprises a motor body and an output shaft, and two ends of the output shaft protrude out of the motor body; the two cams are respectively arranged at two ends of the output shaft; two connecting rods; the two connecting rods are respectively connected with the two cams; the two compression cylinders are respectively arranged at two ends of the motor and are respectively connected with the two connecting rods. The motor outputs rotary motion through the two ends of the output shaft, the two ends of the output shaft are connected with the connecting rod through the cam, the connecting rod is connected with the compression cylinder, and thus the power of the motor is respectively output to the two compression cylinders from the two ends of the motor. The two compression cylinders are respectively positioned at the two ends of the motor, the two ends of the motor output shaft simultaneously drive the two compression cylinders respectively, so that the mass distribution of the double-head pump is balanced in the whole, and the double-head pump has the characteristic of small vibration during working.

Description

Double-head pump

Technical Field

The utility model relates to the technical field of fluid pressure equipment, in particular to a double-head pump.

Background

Fluid, a power medium commonly used in industrial equipment and industry production, such as an air power system and a hydraulic power system. The key equipment of the fluid as a power medium is a pump, and the fluid is pressurized by the pump, so that the fluid has higher pressure, and power output can be carried out by means of power elements such as a pneumatic motor, a hydraulic push rod and the like.

In some conventional pumps, the main structure includes a motor, a linkage, and a compression cylinder, the motor being connected to the linkage, the linkage being connected to the compression cylinder. In such pumps, the linkage and compression cylinder are typically offset to one side, resulting in an overall center of gravity offset, which results in a large vibration defect in the pump.

Disclosure of Invention

In order to overcome the defects of the prior art, one of the purposes of the utility model is to provide a double-head pump so as to solve the technical problem of large vibration of the pump in the prior art.

One of the purposes of the utility model is realized by adopting the following technical scheme:

a dual head pump, the dual head pump comprising:

the motor comprises a motor body and an output shaft, and two ends of the output shaft protrude out of the motor body;

the two cams are respectively arranged at two ends of the output shaft;

two connecting rods; the two connecting rods are respectively connected with the two cams;

the two compression cylinders are respectively arranged at two ends of the motor and are respectively connected with the two connecting rods.

Optionally, the compression cylinder comprises a fixing seat, a cylinder body, a cylinder cover and a piston, wherein the fixing seat is connected with the motor, the cylinder body is arranged on the fixing seat, the cylinder cover is connected with the fixing seat and covers one end of the cylinder body far away from the fixing seat, and the piston is arranged in the cylinder body;

the connecting rod is connected with the corresponding piston.

Optionally, the cylinder cover comprises a middle plate, an end cover, an air inlet valve and an air outlet valve, wherein the middle plate covers one end of the cylinder body far away from the fixing seat, and a first through hole and a second through hole are formed in the middle plate;

the air inlet valve is arranged in the first through hole and is used for conducting the first through hole when the piston sucks air and closing the first through hole when the piston exhausts air;

the exhaust valve is arranged in the second through hole and is used for conducting the second through hole when the piston exhausts and closing the second through hole when the piston sucks air;

the end cover is provided with an air inlet, an air outlet, an air inlet cavity and an air outlet cavity, the air inlet cavity is communicated with the air inlet and the first through hole, and the air outlet cavity is communicated with the air outlet and the second through hole.

Optionally, the exhaust intracavity is equipped with the baffle, the baffle is in the exhaust intracavity separates out main cavity and centers on the cavity of making an uproar way of making an uproar that falls that main cavity set up, main cavity intercommunication the second through-hole, the cavity of making an uproar way one end intercommunication main cavity, the other end intercommunication of making an uproar the venthole.

Optionally, the air inlet valve is located at one side of the middle plate, close to the cylinder body, and comprises a first screw, a first pressing block and a first elastic valve plate, one end of the first elastic valve plate covers the first through hole, the first pressing block is arranged at the other end of the first elastic valve plate, and the first screw sequentially penetrates through the first pressing block and the first elastic valve plate and is connected with the middle plate;

the first screw is positioned on one side of the middle plate, which is close to the cylinder body;

the exhaust valve comprises a second screw, a second pressing block and a second elastic valve plate, one end of the second elastic valve plate is covered on the second through hole, the second pressing block is arranged at the other end of the second elastic valve plate, and the second screw sequentially penetrates through the second pressing block and the second elastic valve plate and is connected with the middle plate.

Optionally, the double-head pump further comprises two balancing weights, and the two balancing weights are respectively arranged at two ends of the output shaft.

Optionally, one end of the connecting rod is provided with a lantern ring, the lantern ring is sleeved on the cam, and the other end of the connection is provided with a connecting disc;

the piston is fixed on the connecting disc.

Optionally, the piston is in a ring shape;

the double-head pump further comprises a pressure plate, the pressure plate is connected with the connecting disc through a hollow area of the piston, and the pressure plate and the connecting disc are clamped and fixed on the piston.

Optionally, the motor is brushless motor, brushless motor includes first end cover, second end cover, external rotor, stator winding, output shaft, circuit board, installation section of thick bamboo and motor casing, first end cover with the second end cover set up respectively in the both ends of motor casing, the installation section of thick bamboo with the second end cover is connected, the circuit board set up in the medial surface of second end cover, stator winding stack is located on the installation section of thick bamboo, outer change from the cover in on the stator winding, the output shaft passes in proper order first end cover, installation section of thick bamboo and second end cover, just the output shaft with the external rotor is connected.

Optionally, the double-head pump further comprises a fan blade, the fan blade comprises a hub, a shaft sleeve and a blade, the blade is arranged on the outer circumferential surface of the hub, the shaft sleeve is arranged at the axial center of the hub, one end of the shaft sleeve is connected with the hub, the inner circumferential surface of the other end of the shaft sleeve is provided with a protrusion, and the other end of the shaft sleeve is further provided with a deformation joint extending along the axial center direction;

the end part of the output shaft is provided with a clamping groove matched with the protrusion, and when the shaft sleeve is sleeved on the end part of the output shaft, the protrusion is embedded into the clamping groove.

Compared with the prior art, the utility model has the beneficial effects that:

in this application, the motor outputs rotary motion through the both ends of output shaft, is connected through cam and connecting rod at the both ends of output shaft, and compression cylinder is connected to the connecting rod, so the power of motor exports to two compression cylinders respectively from the both ends of motor. The two compression cylinders are respectively positioned at the two ends of the motor, the two ends of the motor output shaft simultaneously drive the two compression cylinders respectively, so that the mass distribution of the double-head pump is balanced in the whole, and the double-head pump has the characteristic of small vibration during working.

Drawings

FIG. 1 is a schematic diagram of a dual head pump of the present utility model;

FIG. 2 is an exploded schematic view of the dual head pump of the present utility model;

FIG. 3 is a schematic view of the connecting rod, cylinder block and cylinder head of the dual head pump of the present utility model;

FIG. 4 is an exploded view of another view of the head of the dual head pump of the present utility model;

FIG. 5 is an exploded view of a motor and fan blades in the dual head pump of the present utility model;

FIG. 6 is a schematic view of the structure of the fan blades in the double-head pump of the present utility model;

FIG. 7 is a schematic diagram of a motor cut-away in a dual head pump of the present utility model;

fig. 8 is an exploded schematic view of the motor in the double-ended pump of the present utility model.

In the figure:

1. a motor; 11. an output shaft; 111. a clamping groove; 12. a first end cap; 13. a second end cap; 14. an outer rotor; 15. a stator winding; 16. a circuit board; 17. a mounting cylinder; 18. a motor housing;

2. a cam;

3. a connecting rod; 31. a collar; 32. a connecting disc;

4. a compression cylinder; 41. a fixing seat; 42. a cylinder; 43. a cylinder cover; 431. a middle plate; 4311. a first through hole; 4312. a second through hole; 432. an end cap; 4321. an air inlet; 4322. an air outlet hole; 4323. an air inlet cavity; 4324. an exhaust chamber; 43241. a partition plate; 43242. a main cavity; 43243. noise reduction cavity channels; 433. an intake valve; 434. an exhaust valve; 44. a piston;

5. a balance weight;

6. a pressure plate;

7. an air inlet three-way pipe;

8. a three-way pipe for air outlet;

9. a fan blade; 91. a hub; 92. a shaft sleeve; 921. a protrusion; 922. a deformation joint; 93. and (3) a blade.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is correspondingly changed.

Furthermore, the descriptions of "first," "second," and the like, herein are for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present application.

A double-ended pump as shown in fig. 1-2 comprises a motor 1, two cams 2, two connecting rods 3 and two compression cylinders 4. Specifically, the motor 1 includes a motor 1 body and an output shaft 11, and both ends of the output shaft 11 protrude from the motor 1 body. Two cams 2 are provided at both ends of the output shaft 11, respectively. The two connecting rods 3 are respectively connected with the two cams 2. Two compression cylinders 4 set up respectively in the both ends of motor 1, and two compression cylinders 4 are connected with two connecting rods 3 respectively, and connecting rod 3 is connected with compression cylinder 4 for drive compression cylinder 4. In the present application, the motor 1 outputs a rotary motion through both ends of the output shaft 11, and is connected with the connecting rod 3 through the cam 2 at both ends of the output shaft 11, the connecting rod 3 is connected with the compression cylinder 4, so that the power of the motor 1 is output from both ends of the motor 1 to the two compression cylinders 4, respectively. The two compression cylinders 4 are respectively positioned at the two ends of the motor 1, the two ends of the output shaft 11 of the motor 1 simultaneously drive the two compression cylinders 4 respectively, and the double-head pump has the characteristic of small vibration when working due to balanced mass distribution.

In addition, compared with the output power of the motor 1 being transmitted to one compression cylinder 4, the output power of the motor 1 is transmitted to two compression cylinders 4, the two compression cylinders 4 have smaller volumes, which can be regarded as small compression cylinders 4, the small compression cylinders 4 are seen alone, the small compression cylinders 4 have higher vibration intensity, the small compression cylinders 4 are easier to be fixedly mounted, the double-head pump in the present application is easier to assemble, and vibration can be more effectively weakened by assembly fixation after assembly.

As shown in fig. 2 and 3, the compression cylinder 4 includes a fixed seat 41, a cylinder body 42, a cylinder head 43, and a piston 44. The fixing seat 41 is connected with the motor 1, specifically, is connected with the end face of the motor 1 or is located in a shell structure on the end face, a transmission cavity for accommodating the connecting rod 3 and the cam 2 and a mounting cavity for mounting the cylinder body 42 are arranged on the fixing seat 41, and the transmission cavity is communicated with the mounting cavity. The cylinder 42 is disposed in the fixing seat 41, specifically, embedded in the mounting cavity. The cylinder cover 43 is connected with the fixed seat 41 and covers one end of the cylinder body 42 far away from the fixed seat 41, and the piston 44 is arranged in the cylinder body 42.

The connecting rod 3 is arranged in the transmission cavity, one end of the connecting rod 3 is connected with the corresponding cam 2, and the other end of the connecting rod 3 is connected with the corresponding piston 44. The two ends of the output shaft 11 respectively extend into the transmission cavities of the two fixing seats 41.

Further, as shown in fig. 3 and 4, the cylinder cover 43 includes a middle plate 431, an end cover 432, an intake valve 433 and an exhaust valve 434, the middle plate 431 covers one end of the cylinder 42 far away from the fixed seat 41, and a first through hole 4311 and a second through hole 4312 are provided on the middle plate 431. The intake valve 433 is disposed in the first through hole 4311, and the intake valve 433 is a control structure for closing the first through hole 4311 when the piston 44 is inhaling, and closing the first through hole 4311 when the piston 44 is exhausting. The exhaust valve 434 is disposed in the second through hole 4312, and the exhaust valve 434 is a control structure for closing the second through hole 4312 when the piston 44 is exhausting, and closing the second through hole 4312 when the piston 44 is inhaling. The end cover 432 is provided with an air inlet 4321, an air outlet 4322, an air inlet chamber 4323 and an air outlet chamber 4324, wherein the air inlet chamber 4323 is communicated with the air inlet 4321 and the first through hole 4311, and the air outlet chamber 4324 is communicated with the air outlet 4322 and the second through hole 4312.

The double-ended pump in this application has two working strokes, an intake stroke and a compression stroke, respectively. In the air suction stroke, the connecting rod 3 drives the piston 44 to expand the space in the cylinder 42, the exhaust valve 434 closes the second through hole 4312 to prevent the air in the exhaust cavity 4324 from entering the piston 44, the air inlet valve 433 is communicated with the first through hole 4311, the first through hole 4311 is communicated with the air inlet cavity 4323 on the end cover 432, and at the moment, the air enters the air inlet cavity 4323 from the air inlet 4321 and finally enters the cylinder 42; in the compression stroke, the connecting rod 3 drives the piston 44 to compress the space in the cylinder 42, the air inlet valve 433 closes the first through hole 4311, the air inlet chamber 4323 is disconnected from the cylinder 42, the air outlet valve 434 is connected with the second through hole 4312, the air enters the air outlet chamber 4324 through the second through hole 4312 under the pushing of the piston 44, and finally the air is exhausted from the air outlet hole 4322 to the downstream high-pressure air environment, so that the compression of the air is realized.

Further, as shown in fig. 4, a partition 43241 is provided in the exhaust chamber 4324, and the partition 43241 partitions the main chamber 43242 and the noise reduction chamber 43243 in the exhaust chamber 4324. The main cavity 43242 faces the second through hole 4312, and the main cavity 43242 communicates with the second through hole 4312. One end of the noise reduction cavity 43243 is communicated with the main cavity 43242, and the other end is communicated with the air outlet 4322. The partition 43241 and the side wall of the inner wall of the exhaust chamber 4324 surround the main chamber 43242, and an opening is provided at one end of the partition 43241. Noise reduction channel 43243 is disposed around main cavity 43242, and specifically noise reduction channel 43243 opens from baffle 43241 and extends toward the other end of baffle 43241. In this embodiment, the exhaust chamber 4324 is partitioned by the partition 43241, and the gas flow direction is changed, so that the air flow noise of the double-head pump is effectively reduced.

For the aforementioned air inlet valve 433, the air inlet valve 433 is located one side of the middle plate 431 near the cylinder 42, the air inlet valve 433 includes a first screw, a first pressing block and a first elastic valve plate, the first elastic valve plate is located one side of the middle plate 431 near the cylinder 42, one end of the first elastic valve plate covers the first through hole 4311, the first pressing block is disposed at the other end of the first elastic valve plate, and the first screw sequentially penetrates through the first pressing block and the first valve plate and is connected with the middle plate 431.

The first screw is located at one side of the middle plate 431 near the cylinder 42.

For the exhaust valve 434, the exhaust valve 434 includes a second screw, a second pressing block and a second elastic valve plate, the second elastic valve plate is located at one side of the middle plate 431 far away from the cylinder 42, one end of the second elastic valve plate is covered on the second through hole 4312, the second pressing block is disposed at the other end of the second elastic valve plate, and the second screw sequentially passes through the second pressing block and the second elastic valve plate and is connected with the middle plate 431.

In some further embodiments of the double-head pump, the double-head pump further includes two weights 5, the two weights 5 being disposed at two ends of the output shaft 11, respectively, and the vibrations generated by the cam 2 during rotation are balanced by providing the weights 5.

In some embodiments of the connecting rod 3, as shown in fig. 3, one end of the connecting rod 3 is provided with a collar 31, the collar 31 is sleeved on the cam 2, and the other end of the connection is provided with a connecting disc 32. The piston 44 is fixed to the connecting disc 32.

Further, the piston 44 is annular. The double-headed pump further includes a pressure plate 6, the pressure plate 6 being connected to the land 32 through a hollow area of the piston 44, the pressure plate 6 and the land 32 holding the piston 44.

In some embodiments of the compression cylinder 4, as shown in fig. 4, an air inlet 4321 and an air outlet are provided on the compression cylinder 4.

The double-head pump further comprises an air inlet three-way pipe 7 and an air outlet three-way pipe 8, wherein two interfaces of the air inlet three-way pipe 7 are respectively connected with air inlets 4321 of the two compression cylinders 4, and two interfaces of the air outlet three-way pipe 8 are respectively connected with air outlets of the two compression cylinders 4.

In addition, in order to improve the heat dissipation effect of the double-head pump, as shown in fig. 2 and 5, the double-head pump further comprises a fan blade 9, wherein the fan blade 9 is positioned in the transmission cavity, specifically, the fan blade 9 is mounted at the end part of the output shaft 11, and the fan blade 9 rotates under the driving of the output shaft 11, so that heat dissipation is performed on the compression cylinder 4 and the motor 1.

In some embodiments of the motor, as shown in fig. 7 and 8, the motor is a brushless motor, and the brushless motor includes a first end cover 12, a second end cover 13, an outer rotor 14, a stator winding 15, an output shaft, a circuit board 16, a mounting cylinder 17, and a motor housing 18. The first end cover 12 and the second end cover 13 are respectively provided at both ends of the motor case 18. The mounting tube 17 is connected to the second end cap 13, and the wiring board 16 is provided on the inner side surface of the second end cap 13, specifically, the wiring board 16 is a circular wiring board 16. The stator winding 15 is sleeved on the mounting cylinder 17, specifically, the silicon steel sheet set of the stator winding 15 is fixed on the mounting cylinder 17. The outer rotor 14 is stuck with rare earth high magnetic magnet and is externally sleeved on the stator winding 15. The output shaft passes through the first end cover 12, the mounting cylinder 17 and the second end cover 13 in order, and the output shaft is connected with the outer rotor 14. When the stator winding 15 is electrified, the outer rotor 14 rotates, and then drives the output to rotate, so that power is output. The motor adopts a direct current outer rotor structure, two ends of the motor are output in a bidirectional mode, and the motor with the structure has the characteristics of light weight, high energy efficiency conversion rate and low working power.

As shown in fig. 5 and 6, specifically, the fan blade 9 includes a hub 91, a sleeve 92 and a blade 93, the blade 93 is disposed on an outer circumferential surface of the hub 91, the sleeve 92 is disposed at an axial center position of the hub 91, one end of the sleeve 92 is connected to the hub 91, a protrusion 921 is disposed on an inner circumferential surface of the other end of the sleeve 92, and a deformation slit 922 extending along the axial center direction is further disposed on the other end of the sleeve 92. The end of the output shaft 11 is provided with a clamping groove 111 which is matched with the protrusion 921, and when the shaft sleeve 92 is sleeved on the end of the output shaft 11, the protrusion 921 is embedded into the clamping groove 111. Naturally, the circumferential surface of the end of the output shaft 11 is provided with a limiting surface, and the sleeve 92 is provided with a corresponding mounting hole.

Because the other end of the shaft sleeve 92 is provided with the deformation joint 922, the other end of the shaft sleeve 92 can be elastically deformed in the sleeving process of the shaft sleeve 92 and the output shaft 11. Therefore, during installation, the shaft sleeve 92 can be directly sleeved on the output shaft 11, the end part of the output shaft 11 stretches out of the other end of the shaft sleeve 92, the other end of the shaft sleeve 92 deforms, the boss 921 is stretched out until the boss 921 is matched with the size of the end part of the output shaft 11, and the boss 921 is embedded into the clamping groove 111, so that the fan blade 9 is fixedly installed. In the whole installation and disassembly process, the device can be quickly installed without tools, has the effect of quick disassembly and assembly, simplifies the whole assembly structure, and has better reliability.

Specifically, the protrusions 921 may be independent protruding structures, and the corresponding clamping grooves 111 may be separate grooves or annular grooves; the protrusion may also be an annular protrusion structure, and the corresponding clamping groove 111 is an annular groove.

The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.

Claims (5)

1. A dual head pump, the dual head pump comprising:

the motor comprises a motor body and an output shaft, and two ends of the output shaft protrude out of the motor body;

the two cams are respectively arranged at two ends of the output shaft;

two connecting rods; the two connecting rods are respectively connected with the two cams;

the two compression cylinders are respectively arranged at two ends of the motor and are respectively connected with the two connecting rods;

the compression cylinder comprises a fixed seat, a cylinder body, a cylinder cover and a piston, wherein the fixed seat is connected with the motor, the cylinder body is arranged on the fixed seat, the cylinder cover is connected with the fixed seat and covers one end, far away from the fixed seat, of the cylinder body, and the piston is arranged in the cylinder body;

the connecting rod is connected with the corresponding piston;

the cylinder cover comprises a middle plate, an end cover, an air inlet valve and an air outlet valve, wherein the middle plate covers one end of the cylinder body far away from the fixed seat, and a first through hole and a second through hole are formed in the middle plate;

the air inlet valve is arranged in the first through hole and is used for conducting the first through hole when the piston sucks air and closing the first through hole when the piston exhausts air;

the exhaust valve is arranged in the second through hole and is used for conducting the second through hole when the piston exhausts and closing the second through hole when the piston sucks air;

the end cover is provided with an air inlet, an air outlet, an air inlet cavity and an air outlet cavity, the air inlet cavity is communicated with the air inlet and the first through hole, and the air outlet cavity is communicated with the air outlet and the second through hole;

the exhaust cavity is internally provided with a baffle plate, the baffle plate is internally divided into a main cavity body and a noise reduction cavity channel which is arranged around the main cavity body, the main cavity body is communicated with the second through hole, one end of the noise reduction cavity channel is communicated with the main cavity body, and the other end of the noise reduction cavity channel is communicated with the air outlet hole;

the air inlet valve is positioned on one side of the middle plate, which is close to the cylinder body, and comprises a first screw, a first pressing block and a first elastic valve plate, one end of the first elastic valve plate is covered on the first through hole, the first pressing block is arranged on the other end of the first elastic valve plate, and the first screw sequentially penetrates through the first pressing block and the first elastic valve plate and is connected with the middle plate;

the first screw is positioned on one side of the middle plate, which is close to the cylinder body;

the exhaust valve comprises a second screw, a second pressing block and a second elastic valve plate, one end of the second elastic valve plate covers the second through hole, the second pressing block is arranged at the other end of the second elastic valve plate, and the second screw sequentially penetrates through the second pressing block and the second elastic valve plate and is connected with the middle plate;

the double-head pump further comprises two balancing weights, and the two balancing weights are respectively arranged at two ends of the output shaft.

2. The dual head pump of claim 1, wherein: one end of the connecting rod is provided with a lantern ring, the lantern ring is sleeved on the cam, and the other end of the connection is provided with a connecting disc;

the piston is fixed on the connecting disc.

3. The dual head pump of claim 2, wherein: the piston is in a circular ring shape;

the double-head pump further comprises a pressure plate, the pressure plate is connected with the connecting disc through a hollow area of the piston, and the pressure plate and the connecting disc are clamped and fixed on the piston.

4. The dual head pump of claim 1, wherein: the motor is brushless motor, brushless motor includes first end cover, second end cover, external rotor, stator winding, output shaft, circuit board, installation section of thick bamboo and motor casing, first end cover with the second end cover set up respectively in the both ends of motor casing, the installation section of thick bamboo with the second end cover is connected, the circuit board set up in the medial surface of second end cover, stator winding stack locates on the installation section of thick bamboo, the outer change from the cover in on the stator winding, the output shaft passes in proper order first end cover, installation section of thick bamboo and second end cover, just the output shaft with the external rotor is connected.

5. The dual head pump of claim 1, wherein: the double-head pump further comprises a fan blade, the fan blade comprises a hub, a shaft sleeve and a blade, the blade is arranged on the outer circumferential surface of the hub, the shaft sleeve is arranged at the axial center position of the hub, one end of the shaft sleeve is connected with the hub, the inner circumferential surface of the other end of the shaft sleeve is provided with a bulge, and the other end of the shaft sleeve is further provided with a deformation joint extending along the axial center direction;

the end part of the output shaft is provided with a clamping groove matched with the protrusion, and when the shaft sleeve is sleeved on the end part of the output shaft, the protrusion is embedded into the clamping groove.