Electric compressor

Abstract

The invention relates to the technical field of electric compressors, in particular to an electric compressor which comprises an electric compressor body, the electric compressor body comprises a driving motor and a compressor and further comprises a transmission shaft rotationally arranged on the electric compressor body and used for connecting the driving motor and the compressor, and a power storage assembly is arranged on the driving motor and used for storing power. When the device works normally, the transmission shaft is used for driving the power storage assembly to work so as to store power, then when the device is started, the butt joint assembly is switched so that the power storage assembly and the transmission shaft can be in direct butt joint and released, and then the driving motor is assisted to be started; the driving motor does not need high-load work, and the service life of the device is prolonged; according to the device, when the power storage assembly stores power, the transmission shaft is in butt joint with the rotating ring through the speed reduction assembly, then the load of the driving motor is reduced, and meanwhile the power storage assembly can store large power.

Description

Technical Field

[0001] The present invention relates to the technical field of electric compressors, and specifically to an electric compressor. Background Art

[0002] Through the combination of electric energy drive and high-efficiency compression technology, the electric compressor realizes an efficient, precise, and environmentally friendly gas compression solution. Specifically, the electric compressor adopts an integrated direct drive design, in which the output shaft of the drive motor and the compressor rotating shaft are coaxially directly connected through a rigid connection, completely eliminating intermediate transmission components (such as belts, gears), thereby achieving lossless power transmission. This structure reduces the equipment volume by more than 30%, and at the same time highly integrates the motor, compressor, and transmission module in a compact space, with the advantages of high power density and space utilization rate.

[0003] Precisely because the output shaft of the drive motor and the compressor rotating shaft adopt a coaxial direct connection design, when the electric compressor starts, if its load is large (such as high backpressure conditions or inertial load at the moment of starting), the motor needs to directly overcome the static friction force of the compressor rotor and the compression reaction force. This non-buffered direct drive characteristic easily leads to a surge in the starting current, which may trigger overcurrent protection and cause starting failure, or affect the service life of the electric compressor. Therefore, we propose an electric compressor. Summary of the Invention

[0004] To solve the above technical problems, an embodiment of the present application provides an electric compressor, including an electric compressor main body. The electric compressor main body includes a drive motor and a compressor, and further includes a transmission shaft rotatably arranged on the electric compressor main body for connecting the drive motor and the compressor. A power storage assembly is arranged on the drive motor, and a speed reduction assembly is arranged on the drive motor. The power storage assembly is connected to the transmission shaft through the speed reduction assembly. When the device is working normally, the transmission shaft drives the power storage assembly to store energy through the speed reduction assembly. Among them, the speed reduction assembly is configured to reduce the load torque transmitted from the transmission shaft to the power storage assembly. A switching and docking assembly connected to the power storage assembly is arranged on the drive motor, and is used to directly dock and release the power storage assembly with the transmission shaft while starting the drive motor to drive the transmission shaft to rotate simultaneously.

[0005] In some embodiments, one end of the drive motor is fixedly connected with an annular housing, and the compressor is fixedly connected with the drive motor through the annular housing; The power storage assembly includes a rotating ring rotatably connected to the inner wall of the annular housing, and a disc spring is arranged inside the rotating ring, with both ends respectively fixedly connected to the rotating ring and the housing of the drive motor.

[0006] In some embodiments, the speed reduction assembly includes a first gear disk disposed on a transmission shaft. A first shaft is rotatably connected to the annular housing. One end of the first shaft is fixedly connected to a second gear disk that meshes with the first gear disk. A plurality of tooth protrusions that mesh with the second gear disk are fixedly connected to the rotating ring at equal intervals and uniformly. The diameter of the rotating ring is greater than that of the first gear disk, so that when the transmission shaft rotates, the rotation speed of the rotating ring is lower than that of the transmission shaft; And a disengaging member connected to the first gear disk is disposed in the annular housing, which is used to drive the first gear disk to move and then disconnect from the transmission shaft; And a locking member connected to the second gear disk is disposed in the annular housing, which is used to lock the second gear disk while the first gear disk disengages from the transmission shaft.

[0007] In some embodiments, the disengaging member includes an annular groove formed in the transmission shaft. A first sliding protrusion is fixedly connected inside the first gear disk. A first sliding groove communicating with the annular groove is formed in the transmission shaft. One end of the first sliding protrusion is located in the first sliding groove and is slidably connected to its inner wall. A hollow tube is sleeved on the transmission shaft. One end of the hollow tube is located inside the first gear disk and is rotatably connected to it. An electric push rod connected to the hollow tube is fixedly connected to the driving motor. Starting the electric push rod drives the first sliding protrusion to move into the annular groove.

[0008] In some embodiments, the locking member includes a friction tube fixedly connected to one side of the second gear disk. A circular ring is fixedly connected to one end of the friction tube. An arc-shaped friction plate is slidably connected between the circular ring and the second gear disk. A sliding ring is fixedly connected to one end of the hollow tube. A rectangular plate is fixedly connected to the sliding ring. A connecting rod is rotatably connected between the rectangular plate and the arc-shaped friction plate through a rotating shaft. Moving the hollow tube uses the connecting rod to push the arc-shaped friction plate to tightly abut against the friction tube to lock the second gear disk.

[0009] In some embodiments, a guide rod is fixedly connected to the sliding ring. A strip-shaped plate is fixedly connected to the annular housing. A hollow cylinder is fixedly connected to one end of the strip-shaped plate. One end of the guide rod is located inside the hollow cylinder and is slidably connected to its inner wall, which is used to guide and limit the movement of the sliding ring.

[0010] In some embodiments, the switching and docking assembly includes a friction ring disposed in the rotating ring. A connecting plate is fixedly connected between the friction ring and the rotating ring. One end of the sliding ring is rotatably connected to a third hollow shaft. The third hollow shaft is connected to the transmission shaft. A friction circular plate is fixedly connected to the third hollow shaft. A second ring body rotatably connected to the friction circular plate is fixedly connected to the extending end of the electric push rod. Starting the electric push rod drives the friction circular plate to move and then contact the friction ring. During this process, the connecting rod first drives the arc-shaped friction plate to approach the friction tube and then drives the arc-shaped friction plate to move away from the friction tube.

[0011] In some embodiments, a ratchet and pawl assembly is provided between the hollow shaft three and the transmission shaft. A sliding convex two is fixedly connected to the outer shell of the ratchet and pawl assembly. A sliding groove two is formed in the inner wall of the hollow shaft three. One end of the sliding convex two is located in the sliding groove two and is slidably connected to its inner wall.

[0012] In some embodiments, a mounting bracket is fixedly connected inside the annular outer shell. A magnetoelectric speed sensor with a detection head facing the gear disk two is fixedly connected to the mounting bracket for monitoring the gear disk two, and the magnetoelectric speed sensor is electrically connected to the controller of the electric push rod.

[0013] In some embodiments, a ring body one is rotatably connected to one end of the gear disk one. A tension spring with two ends fixedly connected to the moving ring and the ring body one respectively is sleeved on the hollow tube.

[0014] The present invention has at least the following beneficial effects: 1. When the device is working normally, the transmission shaft drives the energy storage component to work to store power. Then, when starting the device, by switching the docking component, the energy storage component is directly docked with the transmission shaft and releases the power, thereby assisting the driving motor to start, so that the driving motor does not need to work under high load, and the service life of the device is improved.

[0015] 2. When the energy storage component stores power, the transmission shaft is docked with the rotating ring through the speed reduction component, thereby reducing the load of the driving motor, and at the same time, the energy storage component can store a larger amount of power.

[0016] 3. When the energy storage component stores power, by the cooperation of the gear disk two and the magnetoelectric speed sensor, the number of rotation circles of the gear disk two can be detected, so as to monitor the energy storage degree of the energy storage component in real time. When reaching the specified degree, the electric push rod is controlled to work through the program to disconnect the connection between the gear disk one and the transmission shaft, so as to avoid damage to the main body of the device due to excessive energy storage; on the contrary, when the energy storage component releases power to cooperate with the driving motor to drive the transmission shaft to rotate, the rotation speed of the transmission shaft can be monitored. When its rotation speed reaches the target value, the electric push rod is also controlled to work through the program to disconnect the connection between the energy storage component and the transmission shaft, so as to avoid the additional release of the power of the energy storage component and reduce the energy consumption of the device. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 For the present invention Figure 1 Partial cross-sectional structure schematic diagram; Figure 3 For the present invention Figure 2 Partial cross-sectional structure schematic diagram; Figure 4 For the present invention Figure 3 Partial cross-sectional structure schematic diagram; Figure 5 For the present invention Figure 4 Partial cross-sectional structure schematic diagram; Figure 6 For the present invention Figure 5 Partial cross-sectional structure schematic diagram; Figure 7 Schematic diagram of the structure at the transmission shaft of the present invention; Figure 8 Schematic diagram of the structure of Embodiment 2 of the present invention.

[0018] In the figure: 1 - Electric compressor main body; 11 - Driving motor; 12 - Compressor; 2 - Transmission shaft; 3 - Energy storage assembly; 4 - Speed reduction assembly; 5 - Switching and docking assembly; 31 - Ring-shaped outer shell; 32 - Rotating ring; 33 - Disc spring; 34 - First gear disc; 35 - First shaft; 36 - Second gear disc; 37 - Tooth protrusion; 38 - Detaching member; 39 - Locking member; 41 - Ring-shaped groove; 42 - First sliding protrusion; 43 - First sliding groove; 44 - Hollow tube; 45 - Electric push rod; 46 - Friction tube; 47 - Ring; 48 - Arc-shaped friction plate; 49 - Sliding ring; 51 - Rectangular plate; 52 - Connecting rod; 53 - Guide rod; 54 - Strip-shaped plate; 55 - Hollow cylinder; 56 - Friction ring; 57 - Connecting plate; 58 - Third hollow shaft; 59 - Friction circular plate; 61 - Second ring body; 62 - Ratchet and pawl assembly; 63 - Second sliding protrusion; 64 - Second sliding groove; 65 - Mounting bracket; 66 - Magneto-electric speed sensor; 67 - First ring body; 68 - Tension spring. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0020] Embodiment 1: Please refer to Figures 1-7 , the present invention provides a technical solution: An electric compressor, including an electric compressor main body 1, the electric compressor main body 1 includes a driving motor 11 and a compressor 12, and further includes: A transmission shaft 2, rotatably arranged on the electric compressor main body 1, one end of the transmission shaft 2 is fixedly connected to the output shaft of the driving motor 11, and the other end is fixedly connected to the driving shaft of the compressor 12 to connect the driving motor 11 and the compressor 12; The energy storage assembly 3 is arranged on the drive motor 11, and a speed reduction assembly 4 is arranged on the drive motor 11. The energy storage assembly 3 is connected to the transmission shaft 2 through the speed reduction assembly 4. When the device is working normally, the drive motor 11 drives the transmission shaft 2 to rotate, and the transmission shaft 2 drives the energy storage assembly 3 to store energy through the speed reduction assembly 4. Among them, the speed reduction assembly 4 is configured to reduce the load torque transmitted from the transmission shaft 2 to the energy storage assembly 3; The switching and docking assembly 5 is arranged on the drive motor 11 and connected to the energy storage assembly 3, and is used to directly dock and release the energy storage assembly 3 with the transmission shaft 2 while starting the drive motor 11, so as to drive the transmission shaft 2 to rotate simultaneously; Specifically, when the device is working normally, the transmission shaft 2 is used to drive the energy storage assembly 3 to work to store power. Then, when the device is started, the energy storage assembly 3 is directly docked and released with the transmission shaft 2 through the switching and docking assembly 5, thereby assisting the start of the drive motor 11, so that the drive motor 11 does not need to work under high load, and the service life of the device is improved; At the same time, when the energy storage assembly 3 stores energy, the transmission shaft 2 is docked with the rotating ring 32 through the speed reduction assembly 4, thereby reducing the load of the drive motor 11, and at the same time, the energy storage assembly 3 can store a large amount of power; At the same time, when the energy storage assembly 3 stores energy, the rotation speed of the second gear disk 36 can be detected by the cooperation of the second gear disk 36 and the magnetoelectric speed sensor 66, so as to monitor the energy storage degree of the energy storage assembly 3 in real time. When the specified degree is reached, the electric push rod 45 is controlled to work through the program to disconnect the connection between the first gear disk 34 and the transmission shaft 2, so as to avoid damage to the device main body due to excessive energy storage. On the contrary, when the energy storage assembly 3 releases power to cooperate with the drive motor 11 to drive the transmission shaft 2 to rotate, the rotation speed of the transmission shaft 2 can be monitored. When its rotation speed reaches the target value, the electric push rod 45 is also controlled to work through the program to disconnect the connection between the energy storage assembly 3 and the transmission shaft 2, so as to avoid the additional release of the power of the energy storage assembly 3 and reduce the energy consumption of the device.

[0021] One end of the drive motor 11 is fixedly connected with an annular outer shell 31, and the compressor 12 is fixedly connected with the drive motor 11 through the annular outer shell 31, so that the appearance of the device main body is formed as a whole and is relatively regular; The energy storage assembly 3 includes a rotating ring 32 rotatably connected to the inner wall of the annular outer shell 31, and a disc spring 33 is arranged inside the rotating ring 32, and both ends of the disc spring 33 are fixedly connected to the rotating ring 32 and the outer shell of the drive motor 11 respectively.

[0022] The deceleration assembly 4 includes a first gear disk 34 disposed on the transmission shaft 2. A first shaft 35 is rotatably connected to the annular housing 31. One end of the first shaft 35 is fixedly connected to a second gear disk 36 that meshes with the first gear disk 34. A plurality of gear protrusions 37 that mesh with the second gear disk 36 are evenly and equidistantly fixedly connected to the rotating ring 32. The diameter of the rotating ring 32 is greater than that of the first gear disk 34. When the transmission shaft 2 rotates, the rotation speed of the rotating ring 32 is lower than that of the transmission shaft 2. Specifically, when storing energy, the first sliding protrusion 42 in the first gear disk 34 is located in the first sliding groove 43 on the transmission shaft 2. At this time, the rotation of the transmission shaft 2 drives the first gear disk 34 to rotate, so as to drive the second gear disk 36 to rotate, and then drive the rotating ring 32 to rotate, thereby storing energy through the deformation of the disc spring 33 to complete the energy storage work. During this process, since the diameter of the first gear disk 34 is much smaller than that of the rotating ring 32, when the transmission shaft 2 rotates to store energy in the disc spring 33, only a relatively small force is required, thus reducing the load on the drive motor 11 during energy storage; And a disengaging member 38 connected to the first gear disk 34 is provided in the annular housing 31, which is used to drive the first gear disk 34 to move and then disengage from the transmission shaft 2. The disengaging member 38 includes an annular groove 41 opened on the transmission shaft 2. A first sliding protrusion 42 is fixedly connected in the first gear disk 34. A first sliding groove 43 communicating with the annular groove 41 is opened on the transmission shaft 2. One end of the first sliding protrusion 42 is located in the first sliding groove 43 and is slidably connected to its inner wall. A hollow tube 44 is sleeved on the transmission shaft 2. One end of the hollow tube 44 is located in the first gear disk 34 and is rotatably connected to it. An electric push rod 45 connected to the hollow tube 44 is fixedly connected to the drive motor 11. Starting the electric push rod 45 drives the first sliding protrusion 42 to move into the annular groove 41; Specifically, when the disc spring 33 finishes storing energy, the electric push rod 45 is started to drive the hollow tube 44 to move, and then drive the first gear disk 34 to move relative to the transmission shaft 2, so that the first sliding protrusion 42 disengages from the first sliding groove 43 and moves into the annular groove 41, thereby completing the disengagement operation of the first gear disk 34 from the transmission shaft 2; And a locking member 39 connected to the second gear disk 36 is provided in the annular housing 31, which is used to lock the second gear disk 36 while the first gear disk 34 disengages from the transmission shaft 2. The locking member 39 includes a friction tube 46 fixedly connected to one side of the second gear disk 36. A circular ring 47 is fixedly connected to one end of the friction tube 46. An arc-shaped friction plate 48 is slidably connected between the circular ring 47 and the second gear disk 36. A sliding ring 49 is fixedly connected to one end of the hollow tube 44. A rectangular plate 51 is fixedly connected to the sliding ring 49. A connecting rod 52 is rotatably connected between the rectangular plate 51 and the arc-shaped friction plate 48 through a rotating shaft. Moving the hollow tube 44 uses the connecting rod 52 to push the arc-shaped friction plate 48 to tightly press against the friction tube 46 to lock the second gear disk 36; Specifically, when the device is in the energy storage state, the first gear disk 34 is connected to the transmission shaft 2, while the arc-shaped friction plate 48 is in a state away from the friction tube 46, and at the same time the connecting rod 52 is in an inclined state. After the energy storage is completed, when the electric push rod 45 is started to drive the first gear disk 34 to disengage from the transmission shaft 2, the sliding ring 49 and the rectangular plate 51 are driven to move, thereby driving the connecting rod 52 to deflect, and then pushing the arc-shaped friction plate 48 towards the friction tube 46. When the first gear disk 34 is completely disengaged from the transmission shaft 2, the connecting rod 52 is in a state perpendicular to the axis of the transmission shaft 2, and at the same time the arc-shaped friction plate 48 also tightly abuts against the friction tube 46 and locks it through friction.

[0023] A guide rod 53 is fixedly connected to the sliding ring 49, a strip-shaped plate 54 is fixedly connected to the annular outer shell 31, one end of the strip-shaped plate 54 is fixedly connected to a hollow cylinder 55, and one end of the guide rod 53 is located inside the hollow cylinder 55 and is slidably connected to its inner wall, which is used to guide and limit the movement of the sliding ring 49 to improve the stability of the device during operation.

[0024] The switching and docking assembly 5 includes a friction ring 56 arranged inside the rotating ring 32. A connecting plate 57 is fixedly connected between the friction ring 56 and the rotating ring 32. One end of the sliding ring 49 is rotatably connected to a third hollow shaft 58, the third hollow shaft 58 is connected to the transmission shaft 2, a friction circular plate 59 is fixedly connected to the third hollow shaft 58, and a second ring body 61 rotatably connected to the friction circular plate 59 is fixedly connected to the extending end of the electric push rod 45; Specifically, before the device stops working, the disc spring 33 is already in the energy storage state. At this time, the arc-shaped friction plate 48 is in a state of tightly abutting against the friction tube 46, and the first gear disk 34 is in a state of disengaging from the transmission shaft 2. At this time, if the device main body is to be started, first start the electric push rod 45 to work, drive the friction circular plate 59 on the third hollow shaft 58 to move and contact and abut against the friction ring 56. During this process, the sliding ring 49 and the rectangular plate 51 move, driving the connecting rod 52 to deflect and tilt, thereby driving the arc-shaped friction plate 48 to disengage from the friction tube 46 again, and then unlocking the second gear disk 36, that is, the disc spring 33. Then start the drive motor 11. At the same time, the disc spring 33 releases energy to drive the rotating ring 32 and the friction ring 56 to rotate. The friction ring 56 drives the friction circular plate 59 to rotate through friction, and then jointly drives the transmission shaft 2 to rotate with the drive motor 11.

[0025] A ratchet and pawl assembly 62 is installed between the third hollow shaft 58 and the transmission shaft 2. A second sliding convex 63 is fixedly connected to the outer shell of the ratchet and pawl assembly 62. A second chute 64 is opened on the inner wall of the third hollow shaft 58. One end of the second sliding convex 63 is located inside the second chute 64 and is slidably connected to its inner wall, which is used to guide and limit the movement of the third hollow shaft 58. At the same time, the design of the ratchet and pawl assembly 62 enables the transmission shaft 2 to rotate normally without forcibly driving the friction disk to rotate, avoiding additional energy loss.

[0026] An installation bracket 65 is fixedly connected inside the annular housing 31. A magnetoelectric speed sensor 66 with its detection head facing the second gear disk 36 is fixedly connected to the installation bracket 65, which is used to monitor the rotation speed and the number of rotation turns of the second gear disk 36, and the magnetoelectric speed sensor 66 is electrically connected to the controller of the electric push rod 45.

[0027] Embodiment 2: Please refer to Figures 1-8 , the present invention provides a technical solution: Embodiment 2 is an optimization based on Embodiment 1; One end of the first gear disk 34 is rotatably connected with a first ring body 67. A tension spring 68 with both ends fixedly connected to the moving ring and the first ring body 67 respectively is sleeved on the hollow tube 44. Thus, when starting the electric push rod 45 to drive the first gear disk 34 to move and dock with the transmission shaft 2, if the first sliding convex 42 in the first gear disk 34 is not aligned with the first sliding groove 43, the hollow tube 44 can still move. At this time, the tension spring 68 will be stretched and provide a downward pressure for the first gear disk 34. Then, when the transmission shaft 2 rotates, once the first sliding groove 43 is aligned with the first sliding convex 42, the first gear disk 34 will be driven to dock with the transmission shaft 2 by the reset of the tension spring 68, thereby improving the smoothness during the operation of the device and avoiding interference and damage problems.

[0028] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0029] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention.

Claims

1. An electric compressor, comprising an electric compressor main body (1), and the electric compressor main body (1) includes a drive motor (11) and a compressor (12), characterized in that, It further includes: A drive shaft (2), rotatably arranged on the electric compressor main body (1) for connecting the drive motor (11) and the compressor (12); A power storage assembly (3), arranged on the drive motor (11), and a speed reduction assembly (4) is arranged on the drive motor (11). The power storage assembly (3) is connected to the drive shaft (2) through the speed reduction assembly (4) for, when the device is working normally, the drive shaft (2) drives the power storage assembly (3) to store energy through the speed reduction assembly (4). Wherein, the speed reduction assembly (4) is configured to reduce the load torque transmitted from the drive shaft (2) to the power storage assembly (3); A switching and docking assembly (5), arranged on the drive motor (11) and connected to the power storage assembly (3) for, when starting the drive motor (11), directly docking and releasing the power storage assembly (3) with the drive shaft (2) to simultaneously drive the drive shaft (2) to rotate.

2. The electric compressor according to claim 1, characterized in that: One end of the drive motor (11) is fixedly connected with an annular housing (31), and the compressor (12) is fixedly connected with the drive motor (11) through the annular housing (31); The power storage assembly (3) includes a rotating ring (32) rotatably connected to the inner wall of the annular housing (31), and a disc spring (33) is arranged inside the rotating ring (32) with two ends respectively fixedly connected to the rotating ring (32) and the housing of the drive motor (11).

3. The electric compressor according to claim 2, wherein: The speed reduction assembly (4) includes a first gear disc (34) arranged on the drive shaft (2), a first shaft (35) is rotatably connected to the annular housing (31), a second gear disc (36) meshing with the first gear disc (34) is fixedly connected to one end of the first shaft (35), and a plurality of tooth protrusions (37) meshing with the second gear disc (36) are fixedly connected to the rotating ring (32) at equal intervals and uniformly. And the diameter of the rotating ring (32) is larger than the diameter of the first gear disc (34) so that when the drive shaft (2) rotates, the rotation speed of the rotating ring (32) is lower than the rotation speed of the drive shaft (2); And a disengaging member (38) connected to the first gear disc (34) is arranged inside the annular housing (31) for driving the first gear disc (34) to move and disconnect from the drive shaft (2); And a locking member (39) connected to the second gear disc (36) is arranged inside the annular housing (31) for locking the second gear disc (36) when the first gear disc (34) disengages from the drive shaft (2).

4. The electric compressor according to claim 3, characterized in that: The separation member (38) includes an annular groove (41) formed in the transmission shaft (2). A first sliding protrusion (42) is fixedly connected inside the first gear disk (34). A first sliding groove (43) communicating with the annular groove (41) is formed in the transmission shaft (2). One end of the first sliding protrusion (42) is located in the first sliding groove (43) and is slidably connected to its inner wall. A hollow tube (44) is sleeved on the transmission shaft (2). One end of the hollow tube (44) is located inside the first gear disk (34) and is rotatably connected to it. An electric push rod (45) connected to the hollow tube (44) is fixedly connected to the drive motor (11). Starting the electric push rod (45) drives the first sliding protrusion (42) to move into the annular groove (41).

5. The electric compressor according to claim 4, characterized in that: The locking member (39) includes a friction tube (46) fixedly connected to one side of the second gear disk (36). A circular ring (47) is fixedly connected to one end of the friction tube (46). An arc-shaped friction plate (48) is slidably connected between the circular ring (47) and the second gear disk (36). A sliding ring (49) is fixedly connected to one end of the hollow tube (44). A rectangular plate (51) is fixedly connected to the sliding ring (49). A connecting rod (52) is rotatably connected between the rectangular plate (51) and the arc-shaped friction plate (48) through a rotating shaft. Moving the hollow tube (44) uses the connecting rod (52) to push the arc-shaped friction plate (48) against the friction tube (46) to lock the second gear disk (36).

6. The electric compressor according to claim 5, characterized in that: A guide rod (53) is fixedly connected to the sliding ring (49). A strip-shaped plate (54) is fixedly connected to the annular outer shell (31). A hollow cylinder (55) is fixedly connected to one end of the strip-shaped plate (54). One end of the guide rod (53) is located inside the hollow cylinder (55) and is slidably connected to its inner wall, for guiding and limiting the movement of the sliding ring (49).

7. The electric compressor according to claim 6, characterized in that: The switching and docking assembly (5) includes a friction ring (56) arranged inside the rotating ring (32). A connecting plate (57) is fixedly connected between the friction ring (56) and the rotating ring (32). One end of the sliding ring (49) is rotatably connected to a third hollow shaft (58). The third hollow shaft (58) is connected to the transmission shaft (2). A friction circular plate (59) is fixedly connected to the third hollow shaft (58). A second ring body (61) rotatably connected to the friction circular plate (59) is fixedly connected to the extending end of the electric push rod (45). Starting the electric push rod (45) drives the friction circular plate (59) to move and contact the friction ring (56). During this process, the connecting rod (52) first drives the arc-shaped friction plate (48) to approach the friction tube (46), and then drives the arc-shaped friction plate (48) to move away from the friction tube (46).

8. The electric compressor according to claim 7, characterized in that: A ratchet and pawl assembly (62) is arranged between the third hollow shaft (58) and the transmission shaft (2). A second sliding protrusion (63) is fixedly connected to the outer shell of the ratchet and pawl assembly (62). A second sliding groove (64) is formed in the inner wall of the third hollow shaft (58). One end of the second sliding protrusion (63) is located in the second sliding groove (64) and is slidably connected to its inner wall.

9. The electric compressor according to claim 8, characterized in that: An installation frame (65) is fixedly connected inside the annular outer shell (31), and a magnetoelectric speed sensor (66) with its detection head facing the second gear disk (36) is fixedly connected to the installation frame (65) for monitoring the second gear disk (36), and the magnetoelectric speed sensor (66) is electrically connected to the controller of the electric push rod (45).

10. The electric compressor according to claim 9, characterized in that: One end of the first gear disk (34) is rotatably connected with a first ring body (67), and a tension spring (68) with two ends fixedly connected to the moving ring and the first ring body (67) respectively is sleeved on the hollow tube (44).

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