Rotary piston type gas compressor

Abstract

The utility model relates to a compressor, in particular to a rotary piston type gas compressor, which solves the problems of complex structure and high processing cost of the existing compressor, a driving device of the rotary piston type gas compressor is connected with a driving shaft in a gas compression device, and a piston assembly comprises a piston cylinder, a piston and N baffle assemblies arranged on the cylinder wall along the circumferential direction; the piston is fixedly arranged on the driving shaft in a sleeving mode and located in a cavity of the piston cylinder. The baffle assembly comprises a hinge column, an elastic reset structure and a hinge baffle connected with the peripheral face of the hinge column. The hinge column is hinged to the cylinder wall. The elastic reset structure is used for providing elastic force for the hinge baffle. The hinge baffle can swing back and forth around the hinge column under the action of the elastic force of the elastic reset structure and the pressure of the side wall of the piston, an air inlet channel and an air outlet channel are formed in the positions, corresponding to the baffle assembly, of the cylinder wall, and an air inlet space and an air compression space with variable volumes are formed between the piston and the piston cylinder through rotation of the piston, so that external low-pressure air is sucked, compressed and exhausted.

Description

Technical Field

[0001] The utility model relates to a compressor, in particular to a rotary piston type gas compressor. Background Art

[0002] At present, air conditioners mainly compress gas through compressors to achieve refrigeration. Commonly used compressors include swash plate compressors, scroll compressors, and rotor compressors. The swash plate compressors and scroll compressors commonly used in new energy vehicles have complex structures and large volumes. The double-rotor or triple-rotor compressors commonly used in household air conditioners have their rotors connected by a crankshaft axially, and the rotors are mostly eccentric rotors. Two or three eccentric rotors can cancel out the excess torque when rotating, so that no excess vibration will be generated. However, this requires that the machining accuracy, fitting accuracy, and weight balance of the eccentric rotors and the crankshaft reach a very high level. Otherwise, excess vibration will still be generated, affecting the user experience. Due to the requirement of machining accuracy, the processing cost of these components has been high. Summary of the Utility Model

[0003] The purpose of the utility model is to solve the technical problems of the existing compressors, such as complex structure and high processing cost, and to provide a rotary piston type gas compressor.

[0004] In order to achieve the above-mentioned utility model purpose, the utility model provides the following technical solutions:

[0005] A rotary piston type gas compressor, characterized in that: it includes a housing, a drive shaft, a drive device, and a piston assembly arranged in the housing;

[0006] A main air inlet hole and a main air outlet hole are arranged on the housing;

[0007] The drive shaft is used to connect the piston assembly and the drive device;

[0008] The cylinder wall of the piston cylinder is a cylindrical cavity structure;

[0009] The piston is fixedly sleeved on the drive shaft and is located in the cavity of the piston cylinder; the cross section of the piston has N end parts, and all N end parts are in contact with the inner side surface of the cylinder wall of the piston cylinder;

[0010] The N baffle components are circumferentially arranged on the cylinder wall of the piston cylinder; the baffle component includes a hinge column, an elastic reset structure, and a hinge baffle connected to the outer peripheral surface of the hinge column;

[0011] The hinge column is hinged to the cylinder wall of the piston cylinder; the elastic reset structure is used to provide elastic force to the hinge baffle; the hinge baffle can swing reciprocally around the hinge column under the action of the elastic force of the elastic reset structure and the pressure of the outer wall of the piston;

[0012] Corresponding to the N baffle components, air inlet channels and air outlet channels are provided on the cylinder wall of the piston cylinder. The air inlet channels are used for connecting the main air inlet holes with the inner cavity of the piston cylinder, and the air outlet channels are used for connecting the inner cavity of the piston cylinder with the main air outlet holes.

[0013] When the piston rotates to the hinge baffle abuts against the end of the piston, the hinge baffle is completely pressed into the cylinder wall of the piston cylinder, the air outlet channel is closed by the hinge baffle, and the air inlet channel is communicated with the air inlet space.

[0014] When the piston continues to rotate until the outer wall between the hinge baffle and the adjacent end of the piston abuts, the hinge baffle pops out of the cylinder wall of the piston cylinder; a compression space with a gradually decreasing volume is formed between the side wall of the piston, the piston cylinder and the side of the hinge baffle away from the piston, and the compression space is communicated with the air outlet channel; an air inlet space with a correspondingly increasing volume is formed between the side wall of the piston, the piston cylinder and the side of the hinge baffle close to the piston, and the air inlet space is communicated with the air inlet channel.

[0015] Further, the driving device is a driving motor or a driving internal combustion engine; the driving shaft and the driving motor or the driving internal combustion engine are of an integral structure or a split structure.

[0016] Further, the driving device is a driving motor.

[0017] A bearing is arranged on one side of the driving motor. The inner ring of the bearing is sleeved on the driving shaft and the bearing is located in the inner cavity of the rotor of the driving motor; alternatively, a bearing is arranged on one side of the piston cylinder. The inner ring of the bearing is sleeved on the driving shaft and the bearing is located in the inner cavity of the rotor of the driving motor.

[0018] Further, the driving device is a driving motor; a partition is arranged inside the housing. The piston assembly is arranged on one side of the partition, the driving motor is arranged on the other side of the partition, the main air inlet hole is located on the housing on one side of the partition, and the main air outlet hole is located on the housing on the other side of the partition; a bearing is arranged on the side of the partition close to the driving motor. The inner ring of the bearing is sleeved on the driving shaft and the bearing is located in the inner cavity of the rotor of the driving motor.

[0019] Further, elastic structures for abutting and sealing against the cylinder wall of the piston cylinder are arranged at the N ends of the piston.

[0020] The elastic structure includes a flexible outer wall located at the end of the piston and integral with the piston; alternatively, the elastic structure includes a seal mounting groove provided at the end of the piston, a seal block provided in the seal mounting groove, and an elastic member located between the seal mounting groove and the seal block; alternatively, the elastic structure includes a seal mounting groove provided at the end of the piston and an elastic member located in the seal mounting groove.

[0021] Further, the cross-section of the piston is a regular polygon with N sides, and N is greater than or equal to 3.

[0022] Further, it further includes a one-way valve provided on the air outlet passage; the baffle assembly further includes a wear-resistant head provided at the abutting end of the hinge baffle.

[0023] Further, the elastic reset structure includes a reset plate and a reset spring connected to the outer peripheral surface of the hinge column; the reset spring is located between the piston cylinder and the reset plate and is used to provide an elastic force to the reset plate; alternatively, the elastic reset structure includes a reset spring, and the reset spring is located between the piston cylinder and the hinge baffle and is used to provide an elastic force to the hinge baffle.

[0024] Further, the piston cylinder includes a cylinder wall and upper and lower baffles respectively provided at the top and bottom of the cylinder wall, and the inner side surface of the piston cylinder wall is a cylindrical surface; alternatively, the cylinder wall and the upper baffle or the lower baffle are integrally provided; alternatively, the cylinder wall includes two semi-cylinder walls that are split vertically and each semi-cylinder wall is integrally provided with the upper baffle or the lower baffle respectively.

[0025] Further, the inlet of the air inlet passage is located on the lower baffle or on the upper baffle, and the outlet of the air outlet passage is located on the upper baffle or on the lower baffle.

[0026] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0027] (1) A rotary piston type gas compressor provided by the present utility model, the piston is fixedly sleeved on the drive shaft and is located in the inner cavity of the piston cylinder. The piston is driven by the drive shaft to perform a concentric rotary motion in the piston cylinder. Through the volume change formed between the piston rotation and the piston cylinder, the suction, compression and discharge of external low-pressure gas are realized. Compared with the traditional double-rotor type or triple-rotor type compressor, the piston does not need to be eccentric, and only one piston is required, and there is no need to use a crankshaft anymore, reducing the structural complexity and processing cost.

[0028] (2) A rotary piston type gas compressor provided by the present utility model is provided with an elastic structure at the end of the piston for abutting and sealing with the piston cylinder wall. The elastic structure includes a flexible outer wall located at the end of the piston and integrated with the piston; alternatively, the elastic structure includes a seal mounting groove provided at the end of the piston, a seal block provided in the seal mounting groove, and an elastic member located between the seal mounting groove and the seal block; alternatively, the elastic structure includes a seal mounting groove provided at the end of the piston and an elastic member located in the seal mounting groove. In this way, the self-adaptive adjustment of the gap between the piston and the piston cylinder wall can be realized, ensuring that the end of the piston always abuts against the piston cylinder wall, thereby ensuring the sealing effect, reducing the machining accuracy of the piston and the piston cylinder wall, and saving costs.

[0029] (3) A rotary piston type gas compressor provided by the present utility model, wherein the piston cylinder includes a cylinder wall, an upper baffle and a lower baffle respectively arranged at the top and bottom of the cylinder wall. Alternatively, the cylinder wall and the upper baffle or the lower baffle are integrally arranged. Alternatively, the cylinder wall includes two semi-cylinder walls that are divided vertically, and each semi-cylinder wall is integrally arranged with the upper baffle or the lower baffle respectively. This can save processing and assembly procedures and reduce costs.

[0030] (4) A rotary piston type gas compressor provided by the present utility model, in which the bearing supporting the drive shaft is embedded in the rotor inner cavity of the drive motor, which can further reduce the axial dimension of the entire compressor and is convenient for installation and use in environments with limited space such as automobiles. Description of the Drawings

[0031] Figure 1 Schematic perspective structure diagram of an embodiment of a rotary piston type gas compressor of the present utility model;

[0032] Figure 2 Is a cross-sectional view of an embodiment of the present utility model;

[0033] Figure 3 Is a schematic perspective structure diagram of the cooperation between the drive shaft and the piston assembly in an embodiment of the present utility model Figure 1 ;

[0034] Figure 4 Is a schematic perspective structure diagram of the cooperation between the drive shaft and the piston assembly in an embodiment of the present utility model Figure 2 (The upper baffle and the one-way valve are not shown);

[0035] Figure 5 Is Figure 4 the top view of;

[0036] Figure 6 Is a schematic structure diagram of the integral setting of the cylinder wall of the piston cylinder and the lower baffle in an embodiment of the present utility model;

[0037] Figure 7 Is a schematic structure diagram of the integral setting of the semi-cylinder walls with the upper baffle or the lower baffle respectively in an embodiment of the present utility model;

[0038] Figure 8 Is a schematic structure diagram of the elastic structure being a flexible outer wall integrated with the piston in an embodiment of the present utility model.

[0039] Explanation of the reference numerals is as follows:

[0040] 1 - drive shaft, 2 - piston, 21 - weight reduction hole; 3 - piston cylinder, 31 - air inlet passage, 32 - air outlet passage, 33 - upper baffle, 34 - lower baffle; 4 - sealing block, 5 - baffle assembly, 51 - hinged column, 52 - reset plate, 53 - hinge baffle, 54 - wear-resistant head; 6 - check valve, 7 - return spring, 8 - housing, 81 - main air inlet hole, 82 - main air outlet hole, 83 - half housing; 9 - driving device, 10 - bearing. Detailed implementation manner

[0041] The present utility model will be further described below in conjunction with the drawings and exemplary embodiments.

[0042] Refer to Figures 1-8 , a rotary piston type gas compressor of the present utility model includes a housing 8 and a drive shaft 1, a driving device 9 and a piston assembly arranged in the housing 8. The driving device 9 is a driving motor or a driving internal combustion engine, and the corresponding driving device 9 can be selected according to different installation scenarios. For example, when installed on an electric vehicle, the driving device 9 is a driving motor, and when installed on a fuel vehicle, the driving device 9 is a driving internal combustion engine. The drive shaft 1 is used to connect the piston assembly and the driving device 9, and the drive shaft 1 can be selected to be an integral structure or a split structure with the driving motor or the driving internal combustion engine according to the actual situation. In this embodiment, the driving device 9 is a driving motor, and the drive shaft 1 and the driving motor are of a split structure.

[0043] In order to rotatably support the drive shaft 1, a bearing 10 also needs to be provided. However, setting the bearing 10 will correspondingly increase the axial dimension of the compressor. Therefore, the inner cavity of the rotor of the driving motor needs to be utilized to embed the bearing 10 therein to reduce the overall axial dimension. Therefore, the inner ring of the bearing 10 is sleeved on the drive shaft 1 and the bearing 10 is located in the inner cavity of the rotor of the driving motor; alternatively, a bearing 10 is provided on one side of the piston cylinder 3, the inner ring of the bearing 10 is sleeved on the drive shaft 1 and the bearing 10 is located in the inner cavity of the rotor of the driving motor.

[0044] In order to ensure that the driving motor and the piston assembly do not interfere with each other during operation, a partition is provided inside the housing 8. The piston assembly is arranged on one side of the partition, and the driving motor is arranged on the other side of the partition. The main air inlet hole 81 is located on the housing 8 on one side of the partition, and the main air outlet hole 82 is located on the housing 8 on the other side of the partition. A bearing 10 is provided on the side of the partition close to the driving motor, the inner ring of the bearing 10 is sleeved on the drive shaft 1 and the bearing 10 is located in the inner cavity of the rotor of the driving motor.

[0045] In this embodiment, the structure of the housing 8 is as Figure 1 and Figure 2As shown in the figure, it includes two half - shells 83 that are buckled together. The piston assembly is arranged in one of the half - shells 83, while the drive motor is arranged in the other half - shell 83. The partition is integrally arranged with the half - shell 83 where the piston assembly is located, and the main air inlet 81 is located on one of the half - shells 83, and the main air outlet 82 is located on the other half - shell 83. In this embodiment, the main air inlet 81 is arranged on the half - shell 83 where the drive motor is installed, and the main air outlet 82 is arranged on the half - shell 83 where the piston assembly is installed. In this way, when the external low - pressure gas enters the housing 8 from the air inlet 81, it will first cool the drive motor to ensure the stability of its working temperature. On the half - shell 83 where the piston assembly is located, there is a bearing 10 for rotatably supporting the drive shaft 1. The inner ring of the bearing 10 is sleeved on the drive shaft 1 and the bearing 10 is located in the rotor cavity of the drive motor. In this form of embedding the bearing 10 into the rotor cavity, the axial dimension of the whole compressor can be shortened, which is convenient for installation in places with limited space such as in automobiles.

[0046] The piston assembly includes a piston cylinder 3, a piston 2, and N baffle assemblies 5 arranged circumferentially on the cylinder wall of the piston cylinder 3, where N is an integer greater than or equal to 1.

[0047] The cylinder wall of the piston cylinder 3 is a cylindrical cavity structure, and the inner side surface of the cylinder wall of the piston cylinder 3 is a cylindrical surface. The piston 2 is fixedly sleeved on the drive shaft 1 and is located in the cavity of the piston cylinder 3. To reduce its own weight, a weight - reducing hole 21 is opened on the piston 2. The cross - section of the piston 2 has N ends, and all N ends are in contact with the inner side surface of the cylinder wall of the piston cylinder 3. In this embodiment, the cross - section of the piston 2 is a regular polygon with N sides, and N is greater than or equal to 3. And 3 baffle assemblies 5 are arranged circumferentially on the cylinder wall of the piston cylinder 3. For the convenience of manufacturing, in this embodiment, N is taken as 3, and the cross - section of the piston 2 is an equilateral triangle with 3 ends.

[0048] The baffle assembly 5 includes a hinge post 51, a hinge baffle 53 connected to the outer peripheral surface of the hinge post 51, and an elastic reset structure. The hinge post 51 is hinged to the cylinder wall of the piston cylinder 3. The elastic reset structure is used to provide an elastic force to the hinge baffle 53. A wear-resistant head 54 is provided at the abutting end of the hinge baffle 53 and the outer wall of the piston 2 to improve the service life of the hinge baffle 53. In this way, the hinge baffle 53 can reciprocally swing around the hinge post 51 under the action of the elastic force of the elastic reset structure and the pressure of the side wall of the piston 2. In this embodiment, the elastic reset structure includes a reset plate 52 connected to the outer peripheral surface of the hinge post 51 and a reset spring 7. The reset spring 7 is located between the piston cylinder 3 and the reset plate 52 and is used to provide an elastic force to the reset plate 52, and then transmit the elastic force to the hinge baffle 53 through the hinge post 51, with a simple structure. Alternatively, the elastic reset structure only includes the reset spring 7. At this time, the reset spring 7 is directly located between the piston cylinder 3 and the hinge baffle 53, and the reset spring 7 directly provides an elastic force to the hinge baffle 53. Different forms of the elastic reset structure can be selected according to actual situations.

[0049] In order to cooperate with the hinge baffle 53 to make the rotation smoother, the cross-section of the piston 2 in this embodiment is a special equilateral triangle - Reuleaux triangle, and its three sides are all arc-shaped sides. The abutting end of the hinge baffle 53 slides more smoothly on the outer wall of the piston 2 and does not interfere with the rotation of the piston 2.

[0050] In this embodiment, the piston cylinder 3 includes a cylinder wall, and an upper baffle 33 and a lower baffle 34 respectively provided at the top and bottom of the cylinder wall, and its structure is as Figure 3 shown; in order to save processing and assembly processes and reduce costs, alternatively, the cylinder wall and the upper baffle 33 or the lower baffle 34 are integrally provided, as Figure 6 shown, which is the case where the cylinder wall and the lower baffle 34 are integrally provided; or, as Figure 7 shown, the cylinder wall includes two half-cylinder walls that are divided vertically and each half-cylinder wall is integrally provided with the upper baffle 33 or the lower baffle 34 respectively.

[0051] At the adjacent positions corresponding to the 3 baffle assemblies 5 on the cylinder wall of the piston cylinder 3, corresponding air inlet channels 31 and air outlet channels 32 are provided. The air inlet channel 31 is used for the communication between the main air inlet hole 81 and the inner cavity of the piston cylinder 3, and the air outlet channel 32 is used for the communication between the inner cavity of the piston cylinder 3 and the main air outlet hole 82. The outlet of the air inlet channel 31 and the inlet of the air outlet channel 32 are both located on the inner side surface of the cylinder wall of the piston cylinder 3, while the inlet of the air inlet channel 31 is located on the lower baffle 34 or on the upper baffle 33, and the outlet of the air outlet channel 32 is located on the upper baffle 33 or on the lower baffle 34, which can be selected according to actual situations. In this embodiment, the inlet of the air inlet channel 31 is located on the lower baffle 34, the outlet of the air outlet channel 32 is located on the upper baffle 34, and a check valve 6 is correspondingly provided on the air outlet channel 32. In this embodiment, the check valve 6 is provided at the outlet position of the air outlet channel 32 on the upper baffle 34.

[0052] When the piston 2 rotates until the hinge baffle 53 abuts against the end of the piston 2, the hinge baffle 53 is completely pressed into the cylinder wall of the piston cylinder 3. At this time, the inlet of the air outlet passage 32 can be arranged corresponding to the side of the hinge baffle 53 away from the piston 2 or corresponding to the outer end face of the hinge baffle 53. In this way, when the hinge baffle 53 is completely pressed into the cylinder wall of the piston cylinder 3, the air outlet passage 32 can be closed. In this embodiment, in order to ensure the sealing effect, as Figure 5 shown, the inlet of the air outlet passage 32 is arranged corresponding to the side of the hinge baffle 53 away from the piston 2, and at this time the air inlet passage 31 is communicated with the air inlet space; when the piston 2 continues to rotate until the outer wall between the hinge baffle 53 and the adjacent end of the piston 2 abuts, the hinge baffle 53 pops out of the cylinder wall of the piston cylinder 3; a compressed air space with a gradually decreasing volume is formed between the side wall of the piston 2, the piston cylinder 3 and the side of the hinge baffle 53 away from the piston 2, and the compressed air space is communicated with the air outlet passage 32; an air inlet space with a correspondingly increasing volume is formed between the side wall of the piston 2, the piston cylinder 3 and the side of the hinge baffle 53 close to the piston 2, and the air inlet space is communicated with the air inlet passage 31.

[0053] In order to reduce the machining accuracy of the cylinder wall of the piston cylinder 3 and the side wall of the piston 2 while ensuring the sealing performance, elastic structures for abutting and sealing against the cylinder wall of the piston cylinder 3 are provided at the three ends of the piston 2. There are three forms of the elastic structures, as Figure 3 shown, including a seal mounting groove provided at the end of the piston 2, a seal block 4 provided in the seal mounting groove, and an elastic member located between the seal mounting groove and the seal block 4. The elastic force of the elastic member makes the seal block 4 always abut against the cylinder wall of the piston cylinder 3, and a sealing strip is provided between the seal block 4 and the side wall of the seal mounting groove to ensure that gas will not leak from the seal mounting groove. Or, as Figure 8 shown, the elastic structure includes a flexible outer wall located at the end of the piston 2 and integrally provided with the piston 2; or, without using the seal block 4, the elastic structure only includes a seal mounting groove provided at the end of the piston 2 and an elastic member located in the seal mounting groove, and the sealing is achieved by the elastic force of the elastic member. The elastic member can be made of high-temperature resistant rubber material. In this way, the adaptive adjustment of the gap between the piston 2 and the cylinder wall of the piston cylinder 3 can be realized, and high machining and fitting accuracy are not required to ensure the sealing effect, greatly reducing the processing cost.

[0054] During use, external low-pressure gas enters the housing 8 through the self-inlet hole 81, then enters from the inlet of the air inlet passage 31 and enters the air inlet space inside the piston cylinder 3 from the outlet of the air inlet passage 31. As the drive shaft 1 drives the piston 2 to rotate, the low-pressure gas enters the compressed air space. As the piston 2 further rotates, the volume of the compressed air space gradually decreases, the low-pressure gas is compressed, and finally is discharged from the air outlet passage 32 and enters the external high-pressure gas-using equipment through the self-outlet hole 82.

[0055] The embodiments described above are only descriptions of the specific implementation manners of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A rotary piston type gas compressor, characterized in that: It includes a housing (8), a drive shaft (1), a drive device (9) and a piston assembly arranged inside the housing (8); A main air inlet hole (81) and a main air outlet hole (82) are arranged on the housing (8); The drive shaft (1) is used to connect the piston assembly and the drive device (9); The piston assembly includes a piston cylinder (3), a piston (2) and N baffle assemblies (5); N is an integer greater than or equal to 1; The cylinder wall of the piston cylinder (3) is a cylindrical cavity structure; The piston (2) is fixedly sleeved on the drive shaft (1) and is located inside the cavity of the piston cylinder (3); the cross section of the piston (2) has N ends, and the N ends are all in contact with the inner side surface of the cylinder wall of the piston cylinder (3); The N baffle assemblies (5) are circumferentially arranged on the cylinder wall of the piston cylinder (3); the baffle assembly (5) includes a hinge column (51), an elastic reset structure and a hinge baffle (53) connected to the outer peripheral surface of the hinge column (51); The hinge column (51) is hinged to the cylinder wall of the piston cylinder (3); the elastic reset structure is used to provide elastic force to the hinge baffle (53); the hinge baffle (53) can swing reciprocally around the hinge column (51) under the action of the elastic force of the elastic reset structure and the pressure of the outer wall of the piston (2); Corresponding to the N baffle assemblies (5) on the cylinder wall of the piston cylinder (3), there are corresponding air inlet channels (31) and air outlet channels (32). The air inlet channel (31) is used for the communication between the main air inlet hole (81) and the inner cavity of the piston cylinder (3), and the air outlet channel (32) is used for the communication between the inner cavity of the piston cylinder (3) and the main air outlet hole (82); When the piston (2) rotates to the hinge baffle (53) abuts against the end of the piston (2), the hinge baffle (53) is completely pressed into the cylinder wall of the piston cylinder (3), the air outlet channel (32) is closed by the hinge baffle (53), and the air inlet channel (31) is communicated with the air inlet space; When the piston (2) continues to rotate to the hinge baffle (53) abuts against the outer wall between adjacent ends of the piston (2), the hinge baffle (53) pops out of the cylinder wall of the piston cylinder (3); a compressed air space with a gradually decreasing volume is formed between the side wall of the piston (2), the piston cylinder (3) and the side of the hinge baffle (53) away from the piston (2), and this compressed air space is communicated with the air outlet channel (32); an air inlet space with a correspondingly increasing volume is formed between the side wall of the piston (2), the piston cylinder (3) and the side of the hinge baffle (53) close to the piston (2), and this air inlet space is communicated with the air inlet channel (31).

2. The rotary piston type gas compressor according to claim 1, characterized in that: The drive device (9) is a drive motor or a drive internal combustion engine; the drive shaft (1) and the drive motor or the drive internal combustion engine are of an integral structure or a split structure.

3. According to the rotary piston type gas compressor described in claim 2, characterized in that: The drive device (9) is a drive motor; A bearing (10) is arranged on one side of the drive motor, the inner ring of the bearing (10) is sleeved on the drive shaft (1) and the bearing (10) is located in the inner cavity of the rotor of the drive motor; or, a bearing (10) is arranged on one side of the piston cylinder (3), the inner ring of the bearing (10) is sleeved on the drive shaft (1) and the bearing (10) is located in the inner cavity of the rotor of the drive motor.

4. The rotary piston type gas compressor according to claim 2, characterized in that: The driving device (9) is a driving motor; a partition is arranged inside the housing (8), the piston assembly is arranged on one side of the partition, the driving motor is arranged on the other side of the partition, and the main air inlet hole (81) is located on the housing (8) on one side of the partition, and the main air outlet hole (82) is located on the housing (8) on the other side of the partition; a bearing (10) is arranged on the side of the partition close to the driving motor, the inner ring of the bearing (10) is sleeved on the driving shaft (1) and the bearing (10) is located in the rotor inner cavity of the driving motor.

5. The rotary piston type gas compressor according to claim 3 or 4, characterized in that: Elastic structures for abutting and sealing against the cylinder wall of the piston cylinder (3) are arranged at N ends of the piston (2); The elastic structure includes a flexible outer wall located at the end of the piston (2) and integrated with the piston (2); alternatively, the elastic structure includes a seal mounting groove arranged at the end of the piston (2), a seal block (4) arranged in the seal mounting groove, and an elastic member located between the seal mounting groove and the seal block (4); alternatively, the elastic structure includes a seal mounting groove arranged at the end of the piston (2) and an elastic member located in the seal mounting groove.

6. The rotary piston type gas compressor according to claim 5, characterized in that: The cross-section of the piston (2) is a regular polygon with N sides, and N is greater than or equal to 3.

7. The rotary piston type gas compressor according to claim 6, characterized in that: It further includes a one-way valve (6) arranged on the air outlet passage (32); the baffle assembly (5) further includes a wear-resistant head (54) arranged at the abutting end of the hinge baffle (53).

8. The rotary piston type gas compressor according to claim 7, characterized in that: The elastic reset structure includes a reset plate (52) connected to the outer peripheral surface of the hinge column (51) and a reset spring (7); the reset spring (7) is located between the piston cylinder (3) and the reset plate (52) and is used to provide an elastic force to the reset plate (52); alternatively, the elastic reset structure includes a reset spring (7), and the reset spring (7) is located between the piston cylinder (3) and the hinge baffle (53) and is used to provide an elastic force to the hinge baffle (53).

9. The rotary piston type gas compressor according to claim 8, wherein: The piston cylinder (3) includes a cylinder wall and an upper baffle (33) and a lower baffle (34) respectively arranged at the top and bottom of the cylinder wall, and the inner side surface of the cylinder wall of the piston cylinder (3) is a cylindrical surface; Alternatively, the cylinder wall and the upper baffle (33) or the lower baffle (34) are integrally arranged; Alternatively, the cylinder wall includes two semi-cylinder walls that are divided vertically up and down, and each semi-cylinder wall is integrally arranged with the upper baffle (33) or the lower baffle (34) respectively.

10. The rotary piston type gas compressor according to claim 9, wherein: The inlet of the air inlet passage (31) is located on the lower baffle (34) or on the upper baffle (33), and the outlet of the air outlet passage (32) is located on the upper baffle (33) or on the lower baffle (34).

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