Main shaft assembly of electric air conditioner compressor

Abstract

The utility model relates to the technical field of air condition compressors, in particular to a main shaft assembly of an electric air condition compressor, which comprises a main shaft body, an oil inlet, an oil outlet, a main shaft sleeve, a main shaft sleeve, a main shaft sleeve, a main shaft sleeve and a main shaft sleeve, and is characterized in that the main shaft body comprises a long shaft section for assembling a motor rotor and a short shaft section for assembling a bearing; a first assembly surface and a second assembly surface are respectively formed on the outer shaft surfaces of the long shaft section and the short shaft section, and the shaft diameter of the first assembly surface is smaller than that of the second assembly surface; the first assembling surface of the long shaft section is close to one side of the oil inlet and is in clearance fit with the assembling hole of the motor rotor, and the second assembling surface of the long shaft section is in interference fit with the assembling hole of the motor rotor; a first assembling surface of the short shaft section is close to one side of the oil outlet and is in clearance fit with an assembling hole of the bearing, and a second assembling surface of the short shaft section is in interference fit with the assembling hole of the bearing; and by arranging the first assembling face and the second assembling face, the positioning and guiding effects in the main shaft assembling process are achieved, assembling is convenient, and the assembling efficiency and precision are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning compressors, in particular to a main shaft assembly of an electric air-conditioning compressor. Background Art

[0002] The electric air-conditioning compressor is one of the key components in the automobile air-conditioning system. It is usually composed of a motor, a compressor body, a solenoid valve and other components. It is driven by a motor to compress the low-pressure and low-temperature refrigerant vapor into high-pressure hot steam. The compressed refrigerant is condensed through the condenser, releasing heat to the outside of the car, and throttled by the expansion valve to reduce pressure and temperature, and absorb heat in the car in the evaporator to achieve the cooling effect of the air conditioner. It is widely used in various types of cars.

[0003] The main shaft assembly is a component that connects the motor and the compressor piston or rotor. It can transmit the power of the motor to the compressor body to drive it to operate. When the main shaft assembly is assembled and connected with other components, such as bearings, motor rotors, etc., interference fit and press-fitting are used for assembly. During press-fitting, the relative position between the assembly holes of the main shaft and other components cannot be accurately guaranteed, resulting in uneven extrusion and friction forces on the outer shaft surface of the main shaft and the inner shaft surface of other components during press-fitting, which affects the accuracy after press-fitting and makes it difficult to improve assembly efficiency.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes the prior art known to those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a main shaft assembly of an electric air-conditioning compressor, which can realize the positioning and guiding function in the main shaft assembly process, facilitate assembly, and ensure assembly efficiency and precision.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a main shaft assembly of an electric air-conditioning compressor, comprising: a main shaft body, the main shaft body including a long shaft section for assembling a motor rotor and a short shaft section for assembling a bearing along the length direction, an oil inlet and an oil outlet are respectively arranged at both ends of the main shaft body, the long shaft section is located on the side where the oil inlet is located, and the short shaft section is located on the side where the oil outlet is located;

[0007] The outer axial surfaces of the long axis segment and the short axis segment respectively form a first assembly surface and a second assembly surface along the axial direction, and the axial diameter of the first assembly surface is smaller than the axial diameter of the second assembly surface;

[0008] The first assembly surface of the long shaft segment is close to one side of the oil inlet and forms a clearance fit with the assembly hole of the motor rotor, and the second assembly surface of the long shaft segment forms an interference fit with the assembly hole of the motor rotor;

[0009] The first assembly surface of the short shaft segment is close to one side of the oil outlet and forms a clearance fit with the assembly hole of the bearing, and the second assembly surface of the short shaft segment forms an interference fit with the assembly hole of the bearing.

[0010] Furthermore, the main shaft body is hollow to form an oil circuit, and two ends of the oil circuit are respectively connected to the oil inlet and the oil outlet.

[0011] Furthermore, the oil circuit includes a main passage and an auxiliary passage; the long axis section is hollow to form the main passage, the axis of the main passage is collinear with the axis of the long axis section, the short axis section is hollow to form the auxiliary passage, the axis of the auxiliary passage is parallel to the axis of the short axis section and is not collinear, and the main passage and the auxiliary passage are staggered and connected.

[0012] Furthermore, a guide block is provided at the oil outlet, one end of the guide block is arranged in the auxiliary passage from the oil outlet, and the other end is protruded outside the end surface of the main shaft body, and the guide block is set through the middle part along the axial direction to form a guide channel, and the guide channel is connected to the auxiliary passage.

[0013] Furthermore, the end of the main passage away from the oil inlet forms a first inclined surface, and the end of the auxiliary passage away from the oil outlet forms a second inclined surface, the first inclined surface and the second inclined surface intersect to form a small hole, and the small hole connects the main passage and the auxiliary passage.

[0014] Furthermore, the main passage includes a drainage section and a guide section, the drainage section is located on the side where the oil inlet is located, the guide section is connected to the auxiliary passage, and the aperture of the drainage section is larger than the aperture of the guide section.

[0015] Furthermore, a step surface is provided between the drainage section and the guide section, and the step surface is inclined toward the side where the guide section is located.

[0016] Furthermore, a drainage sheet is provided in the drainage section, the drainage sheet is spiral-shaped, and both side edges of the drainage sheet are tightly fitted to the inner wall of the drainage section, and the end surface of the drainage sheet is abutted against the step surface.

[0017] Furthermore, the number of spiral revolutions of the guide plate is set to be greater than 1.

[0018] Furthermore, a protrusion is provided on one end of the guide plate facing the step surface, and the protrusion is semicircular and located in the middle of the end surface of the guide plate.

[0019] The beneficial effects of the utility model are as follows: the utility model provides a first assembly surface and a second assembly surface on both the long axis section and the short axis section of the main shaft body. Before press-fitting, the first assembly surface on the long axis section or the short axis section can be pre-arranged in the bearing or motor rotor assembly hole, and the clearance fit between the two forms a positioning guide for the press-fitting process, thereby avoiding the need for manual positioning during press-fitting, facilitating assembly, and avoiding uneven force on the main shaft body during press-fitting. After the press-fitting is completed, the interference fit between the second assembly surface and the bearing or motor rotor assembly hole ensures assembly accuracy and connection stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic structural diagram of a main shaft assembly of an electric air-conditioning compressor in an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the main shaft body in the embodiment of the utility model;

[0023] Figure 3 A side view of the main shaft body in the embodiment of the utility model;

[0024] Figure 4 for Figure 3 Sectional view at AA in the middle;

[0025] Figure 5 It is a schematic diagram of the structure of the drainage plate in the embodiment of the utility model.

[0026] Figure numerals: 10, main shaft body; 10a, first assembly surface; 10b, second assembly surface; 11, major axis section; 12, minor axis section; 13, oil inlet; 14, oil outlet; 151, main passage; 151a, diversion section; 151b, diversion section; 151c, step surface; 152, auxiliary passage; 153, first inclined surface; 154, second inclined surface; 155, small hole; 16, outlet block; 161, outlet channel; 20, diversion plate; 20a, protrusion. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] like Figures 1 to 5 The main shaft assembly of the electric air-conditioning compressor shown in the figure comprises: a main shaft body 10, the main shaft body 10 comprises a long shaft section 11 for assembling the motor rotor and a short shaft section 12 for assembling the bearing along the length direction, an oil inlet 13 and an oil outlet 14 are respectively arranged at both ends of the main shaft body 10, the long shaft section 11 is located on the side where the oil inlet 13 is located, and the short shaft section 12 is located on the side where the oil outlet 14 is located;

[0031] The outer axial surfaces of the long shaft section 11 and the short shaft section 12 respectively form a first assembly surface 10a and a second assembly surface 10b along the axial direction, and the axial diameter of the first assembly surface 10a is smaller than the axial diameter of the second assembly surface 10b;

[0032] The first assembly surface 10a of the long shaft section 11 is close to the oil inlet 13 and forms a clearance fit with the assembly hole of the motor rotor, and the second assembly surface 10b of the long shaft section 11 forms an interference fit with the assembly hole of the motor rotor;

[0033] The first assembly surface 10a of the short shaft segment 12 is close to one side of the oil outlet 14 and forms a clearance fit with the assembly hole of the bearing, and the second assembly surface 10b of the short shaft segment 12 forms an interference fit with the assembly hole of the bearing.

[0034] The utility model provides a first assembly surface 10a and a second assembly surface 10b on both the long axis section 11 and the short axis section 12 of the main shaft body 10. Before press-fitting, the first assembly surface 10a on the long axis section 11 or the short axis section 12 can be pre-arranged in the assembly hole of the bearing or the motor rotor, and the clearance fit between the two forms a positioning guide for the press-fitting process, thereby avoiding the need for manual positioning during press-fitting, facilitating assembly, and avoiding uneven force on the main shaft body 10 during press-fitting. After the press-fitting is completed, the interference fit between the second assembly surface 10b and the assembly hole of the bearing or the motor rotor ensures assembly accuracy and connection stability.

[0035] It should be noted that the axial diameter of the first assembly surface 10a is smaller than the axial diameter of the second assembly surface 10b, but the difference between the two is very small, and the assembly effect of the main shaft body 10 and the bearing or the motor rotor corresponding to the first assembly surface 10a can be directly realized without being affected by external pressure, that is, a clearance fit effect is formed, and after the assembly is completed under further pressure, the stability of the connection between the main shaft body 10 and the bearing or the motor rotor is maintained.

[0036] On the basis of the above embodiment, the main shaft body 10 is hollow to form an oil circuit, and the two ends of the oil circuit are respectively connected to the oil inlet 13 and the oil outlet 14; the lubricating oil enters the oil circuit from the oil inlet 13, and as the main shaft body 10 rotates, the lubricating oil can be transported to the oil outlet 14 through the internal oil circuit to reach the part that needs lubrication, thereby effectively realizing the internal lubrication of the compressor, reducing the wear caused by insufficient local lubrication, and extending the service life.

[0037] On the basis of the above embodiment, the oil circuit includes a main passage 151 and an auxiliary passage 152; the long shaft section 11 is hollow to form the main passage 151, and the axis of the main passage 151 is collinear with the axis of the long shaft section 11; the short shaft section 12 is hollow to form the auxiliary passage 152, and the axis of the auxiliary passage 152 is parallel to the axis of the short shaft section 12 and is not collinear, and the main passage 151 and the auxiliary passage 152 are staggered and connected; the lubricating oil entering the oil circuit is distributed through the main passage 151 and the auxiliary passage 152 to prevent the lubricating oil from flowing directly from the oil outlet 14, which makes it difficult to achieve the expected lubrication effect, and the auxiliary passage 152 is eccentrically set, and during the rotation of the main shaft body 10, the oil outlet 14 connected to the auxiliary passage 152 can pass through a larger range area inside the compressor, thereby expanding the lubrication range and providing a comprehensive lubrication effect.

[0038] On the basis of the above embodiment, an outlet block 16 is provided at the oil outlet 14, one end of the outlet block 16 is provided in the auxiliary passage 152 from the oil outlet 14, and the other end is protruded outside the end surface of the main shaft body 10, and the outlet block 16 is provided through the middle part along the axial direction to form an outlet channel 161, and the outlet channel 161 is connected to the auxiliary passage 152; by providing the outlet channel 161 in the middle part of the outlet block 16, it is ensured that the lubricating oil can be discharged from the auxiliary passage 152 in an orderly manner, thereby avoiding disorderly injection of the oil, and further delivering the lubricating oil into the compressor to improve the lubrication efficiency.

[0039] On the basis of the above embodiment, the end of the main passage 151 away from the oil inlet 13 forms a first inclined surface 153, and the end of the auxiliary passage 152 away from the oil outlet 14 forms a second inclined surface 154, and the first inclined surface 153 and the second inclined surface 154 are intersected to form a small hole 155, and the small hole 155 connects the main passage 151 and the auxiliary passage 152; the setting of the small hole 155 realizes direct connection between the main passage 151 and the auxiliary passage 152, ensuring that the lubricating oil can flow freely between the two; the intersection of the first inclined surface 153 and the second inclined surface 154 helps to achieve pressure balance between the main passage 151 and the auxiliary passage 152, avoiding oil flow instability caused by pressure difference.

[0040] On the basis of the above embodiment, the main passage 151 includes a drainage section 151a and a guide section 151b, the drainage section 151a is located on the side where the oil inlet 13 is located, the guide section 151b is connected to the auxiliary passage 152, and the aperture of the drainage section 151a is larger than the aperture of the guide section 151b; a step surface 151c is provided between the drainage section 151a and the guide section 151b, and the step surface 151c is inclined toward the side where the guide section 151b is located; the setting of the step surface 151c provides a certain guiding effect for the flow of the lubricating oil, so that the lubricating oil can smoothly pass through the drainage section 151a into the guide section 151b, which helps to more effectively guide the lubricating oil from the oil inlet 13 to the auxiliary passage 152, thereby ensuring the orderliness and continuity of the oil flow.

[0041] On the basis of the above embodiment, a drainage plate 20 is arranged in the drainage section 151a, and the drainage plate 20 is spiral, and the two side edges of the drainage plate 20 are pressed and fitted against the inner wall of the drainage section 151a, and the end face of the drainage plate 20 is abutted against the step surface 151c; the internal space of the drainage section 151a is divided by the drainage plate 20 to form a spiral structure. During the rotation of the main shaft body 10, when the lubricating oil enters the drainage section 151a from the oil inlet 13, the spiral space in the drainage section 151a generates suction for the lubricating oil, so that the lubricating oil can quickly enter the guide section 151b and be thrown out through the outlet channel 161 of the outlet block 16, thereby improving the oil supply effect.

[0042] It should be noted that the interference fit formed by the abutment between the end of the guide plate 20 and the step surface 151c and the pressing action between the two side edges and the inner wall of the guide section 151a ensures the stability of the installation position of the guide plate 20 in the guide section 151a, prevents the guide plate 20 from shaking and generating noise as the main body rotates, and prevents unstable connection from affecting the normal operation of the compressor.

[0043] On the basis of the above-mentioned embodiment, the number of spiral revolutions of the drainage piece 20 is set to be greater than 1, that is, at least one spiral structure is adopted to ensure that the spiral suction force generated in the drainage section 151a can meet the set requirements.

[0044] Based on the above embodiment, a protrusion 20a is provided at one end of the guide plate 20 facing the step surface 151c. The protrusion 20a is semicircular and located in the middle of the end surface of the guide plate 20. By providing the protrusion 20a, the two ends of the guide plate 20 form different structural forms, so that it is easy to distinguish the setting direction of the guide plate 20 when assembling the guide plate 20, thereby improving the assembly efficiency.

[0045] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A main shaft assembly of an electric air-conditioning compressor, characterized in that: include: A main shaft body, wherein the main shaft body includes a long shaft section for assembling the motor rotor and a short shaft section for assembling the bearing along the length direction, and an oil inlet and an oil outlet are respectively arranged at both ends of the main shaft body, the long shaft section is located on the side where the oil inlet is located, and the short shaft section is located on the side where the oil outlet is located; The outer axial surfaces of the long axis segment and the short axis segment respectively form a first assembly surface and a second assembly surface along the axial direction, and the axial diameter of the first assembly surface is smaller than the axial diameter of the second assembly surface; The first assembly surface of the long shaft segment is close to one side of the oil inlet and forms a clearance fit with the assembly hole of the motor rotor, and the second assembly surface of the long shaft segment forms an interference fit with the assembly hole of the motor rotor; The first assembly surface of the short shaft segment is close to one side of the oil outlet and forms a clearance fit with the assembly hole of the bearing, and the second assembly surface of the short shaft segment forms an interference fit with the assembly hole of the bearing.

2. The main shaft assembly of the electric air-conditioning compressor according to claim 1, characterized in that: The main shaft body is hollow to form an oil circuit, and two ends of the oil circuit are respectively connected to the oil inlet and the oil outlet.

3. The main shaft assembly of the electric air-conditioning compressor according to claim 2, characterized in that: The oil circuit includes a main passage and an auxiliary passage; the long shaft section is hollow to form the main passage, the axis of the main passage is collinear with the axis of the long shaft section, the short shaft section is hollow to form the auxiliary passage, the axis of the auxiliary passage is parallel to the axis of the short shaft section and is not collinear, and the main passage and the auxiliary passage are interconnected.

4. The main shaft assembly of the electric air-conditioning compressor according to claim 3, characterized in that: A guide block is provided at the oil outlet, one end of the guide block is provided in the auxiliary passage from the oil outlet, and the other end is protruded outside the end surface of the main shaft body, the guide block is provided through the middle part along the axial direction to form a guide channel, and the guide channel is connected to the auxiliary passage.

5. The main shaft assembly of the electric air-conditioning compressor according to claim 3, characterized in that: The end of the main passage away from the oil inlet forms a first inclined surface, and the end of the auxiliary passage away from the oil outlet forms a second inclined surface. The first inclined surface and the second inclined surface are intersected to form a small hole, and the small hole connects the main passage and the auxiliary passage.

6. The main shaft assembly of the electric air-conditioning compressor according to claim 3, characterized in that: The main passage includes a drainage section and a guide section, the drainage section is located on the side where the oil inlet is located, the guide section is connected to the auxiliary passage, and the aperture of the drainage section is larger than the aperture of the guide section.

7. The main shaft assembly of the electric air-conditioning compressor according to claim 6, characterized in that: A step surface is arranged between the drainage section and the guide section, and the step surface is inclined toward the side where the guide section is located.

8. The main shaft assembly of the electric air-conditioning compressor according to claim 7, characterized in that: A drainage sheet is arranged in the drainage section. The drainage sheet is spiral-shaped, and two side edges of the drainage sheet are tightly fitted with the inner side wall of the drainage section. The end surface of the drainage sheet is abutted against the step surface.

9. The main shaft assembly of the electric air-conditioning compressor according to claim 8, characterized in that: The number of spiral revolutions of the guide plate is greater than 1.

10. The main shaft assembly of the electric air-conditioning compressor according to claim 9, characterized in that: A protrusion is arranged on one end of the guide plate facing the step surface. The protrusion is semicircular and located in the middle of the end surface of the guide plate.

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