Electric compressor with lubricating oil duct and lubricating oil duct structure thereof

Abstract

The utility model discloses an electric compressor with a lubricating oil duct and a lubricating oil duct structure thereof, the electric compressor with the lubricating oil duct comprises a static disc, a movable disc and a casing provided with a crankshaft, the back of the movable disc is connected with a front cover, the back of the static disc is connected with a rear cover, a first bearing hole is arranged in the casing, and the back of the movable disc is provided with a second bearing hole. A first bearing and a second bearing are installed in the first bearing hole and the second bearing hole respectively, an eccentric sleeve is rotationally assembled in the second bearing, one end of the crankshaft is fixedly connected with the eccentric sleeve, the other end of the crankshaft is rotationally matched with the second bearing, and a first lubricating oil channel is formed in the eccentric sleeve, arranged in the axial direction of the eccentric sleeve and penetrates through the whole eccentric sleeve. A second lubricating oil channel is arranged in the crankshaft, the second lubricating oil channel is arranged in the circumferential direction of the crankshaft and penetrates through the whole crankshaft, and the first lubricating oil channel and the second lubricating oil channel communicate and are arranged in a staggered mode; a spiral groove is formed in the peripheral face of the eccentric sleeve, and the two ends of the spiral groove communicate with the two end faces of the eccentric sleeve correspondingly.

Description

Technical Field

[0001] The utility model relates to an electric compressor with a lubricating oil channel and a lubricating oil channel structure thereof, belonging to the technical field of electric compressors. Background Art

[0002] With the vigorous development of the new energy electric vehicle industry, the importance of electric compressors has become increasingly prominent. Electric compressors are a mechanical device that uses electrical energy to compress low-pressure gas into high-pressure gas. They occupy a core position in the vehicle's air-conditioning system and play a decisive role in cooling and heating performance. With the application of low-temperature heat pump mode and high-voltage charging mode, the requirements for compressors are gradually increasing. In order to obtain a larger cooling and heating capacity, it is necessary to increase the speed of the compressor to cope with it. However, the lubricating oil channel structure of the electric compressor in the prior art can no longer meet the requirements of the lubricating oil flow rate, which will lead to poor lubrication and excessive wear of the sliding bearing, local temperature rise, and thus produce adverse effects such as bonding. In response to this problem, it is urgent to design a new structure of the lubricating oil channel of the sliding bearing of the electric compressor to meet the lubrication needs of high-speed compressors. Utility Model Content

[0003] The purpose of the utility model is to provide an electric compressor with a lubricating oil passage, so as to solve the technical problem that the electric compressor in the prior art cannot meet the lubrication requirements when running at a high speed. At the same time, the utility model also provides a lubricating oil passage structure in the electric compressor.

[0004] The utility model adopts the following technical scheme: an electric compressor with a lubricating oil passage, which includes a casing with a crankshaft installed, a stator and a movable plate installed in the casing, a front cover connected to the back of the movable plate, a rear cover connected to the back of the stator, a first bearing hole provided in the casing, a second bearing hole provided on the back of the movable plate, a first bearing and a second bearing respectively interference-fitted in the first bearing hole and the second bearing hole, an eccentric sleeve rotatably installed in the second bearing, one end of the crankshaft is fixedly connected to the eccentric sleeve, and the other end is rotatably matched with the second bearing, a first lubricating oil passage is provided inside the eccentric sleeve, the first lubricating oil passage is arranged along the axial direction of the eccentric sleeve and runs through the entire eccentric sleeve, a second lubricating oil passage is provided in the crankshaft, the second lubricating oil passage is arranged along the circumferential direction of the crankshaft and runs through the entire crankshaft, the first lubricating oil passage is connected to the second lubricating oil passage and are staggered; a spiral groove is provided on the outer circumferential surface of the eccentric sleeve, and the two ends of the spiral groove are respectively connected to the two end surfaces of the eccentric sleeve.

[0005] An oil storage cavity is provided on the end surface of the eccentric sleeve close to the bottom surface of the second bearing hole, and an oil passing groove connected to the spiral groove is provided on the end surface of the eccentric sleeve close to the second bearing hole.

[0006] There are two spiral grooves, which are respectively located on two sides of the outer periphery of the eccentric sleeve, and the rotation direction of the spiral groove is opposite to the rotation direction of the crankshaft.

[0007] The second lubricating oil passage comprises a first section oil passage and a second section oil passage which are connected together, the diameter of the first section oil passage is smaller than the diameter of the second section oil passage, the first section oil passage is close to the eccentric sleeve, and the second section oil passage is close to the first bearing hole.

[0008] The axis of the second lubricating oil passage coincides with the axis of the crankshaft, and the axis of the first lubricating oil passage is parallel to the axis of the eccentric sleeve.

[0009] There are three hole grooves on the bottom surface of the first bearing hole. The axis of each hole groove is parallel to the crankshaft, and each hole groove is located above the crankshaft axis. The distance between the center of each hole groove and the center of the first bearing hole is equal.

[0010] The lubricating oil channel structure of the above-mentioned electric compressor includes a first lubricating oil channel opened in the eccentric sleeve, a second lubricating oil channel opened in the crankshaft, and a spiral groove opened on the outer periphery of the eccentric sleeve. The first lubricating oil channel is arranged along the axial direction of the eccentric sleeve and runs through the entire eccentric sleeve, and the second lubricating oil channel is arranged along the circumferential direction of the crankshaft and runs through the entire crankshaft. The first lubricating oil channel is connected to the second lubricating oil channel and is arranged alternately; the two ends of the spiral groove are respectively connected to the two end faces of the eccentric sleeve.

[0011] The lubricating oil channel structure of the electric compressor also includes an oil storage chamber, which is arranged on the end surface of the eccentric sleeve close to the second bearing hole. The end surface of the eccentric sleeve close to the bottom surface of the second bearing hole is provided with an oil passing groove connected to the spiral groove; there are two spiral grooves, which are respectively located on both sides of the outer periphery of the eccentric sleeve, and the rotation direction of the spiral groove is opposite to the rotation direction of the crankshaft.

[0012] The second lubricating oil passage includes a first section of oil passage and a second section of oil passage which are connected together. The diameter of the first section of oil passage is smaller than the diameter of the second section of oil passage. The first section of oil passage is close to the eccentric sleeve, and the second section of oil passage is close to the first bearing hole. The axis of the second lubricating oil passage coincides with the axis of the crankshaft, and the axis of the first lubricating oil passage is parallel to the axis of the eccentric sleeve.

[0013] The lubricating oil channel structure of the electric compressor also includes a hole groove opened on the bottom surface of the first bearing hole, there are three hole grooves, the axis of each hole groove is parallel to the crankshaft, and each hole groove is located above the crankshaft axis, and the distance between the center of each hole groove and the center of the first bearing hole is equal.

[0014] The beneficial effects of the utility model are as follows: when the compressor is running, the refrigerant and the refrigeration oil are compressed by the moving plate and the static plate and separated from the oil and gas and stored in the front cover cavity. When the storage of the lubricating oil reaches a certain amount, it will accumulate between the eccentric sleeve and the bearing hole of the moving plate, and a part of the lubricating oil enters the spiral groove on the outer periphery of the eccentric sleeve, thereby reducing the friction of the second bearing, reducing the temperature of the second bearing, and extending the service life of the second bearing; because the first lubricating oil channel in the eccentric sleeve corresponds to the second lubricating oil channel in the crankshaft and is misaligned and interconnected, another part of the lubricating oil passes through the first lubricating oil channel, and the flow cross-sectional area is suddenly reduced to enter the second lubricating oil channel, thereby achieving the purpose of throttling, and finally flows to the first bearing hole of the casing, the first bearing is press-fitted into the first bearing hole with an interference fit, and the outer diameter of the crankshaft end is installed in the first bearing through a clearance fit, thereby achieving lubrication of the first bearing. Finally, the lubricating oil overflows from the first bearing hole and is again entrained by the refrigerant into the next cycle.

[0015] The utility model can significantly increase the lubricating oil flow of the sliding bearing of the electric compressor, improve the lubrication effect of the sliding bearing of the compressor, increase the service life of the sliding bearing, thereby increasing the service life of the electric compressor, and increase the stability of the compressor during operation, which is beneficial to the NVH performance of the electric compressor, while reducing the weight of the electric compressor, thereby reducing the production cost.

[0016] Preferably, an oil storage chamber is provided at the end of the eccentric sleeve for storing lubricating oil, and the oil groove connects the oil storage chamber and the spiral groove, so that when the crankshaft rotates, the lubricating oil can be quickly introduced into the spiral groove.

[0017] Preferably, two spiral grooves are provided on the eccentric sleeve to increase the lubrication area and improve the lubrication effect; the rotation direction of the spiral groove is opposite to the rotation direction of the crankshaft, which facilitates the accumulation of lubricating oil in the sliding bearing, increases the flow rate of lubricating oil, and makes the lubrication effect better.

[0018] Preferably, in the second lubricating oil passage, the diameter of the first section of the oil passage is small, and the lubricating oil enters the first section of the oil passage first to achieve the purpose of throttling. The diameter of the second section of the oil passage is large, which facilitates the lubricating oil to quickly enter the second section of the oil passage and has a large contact area with the first bearing and the first bearing hole.

[0019] Preferably, the three holes in the first bearing hole are used to store lubricating oil. When a certain amount of lubricating oil accumulates in the first bearing hole, it overflows from the three holes and enters the next cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of an electric compressor with a lubricating oil passage according to an embodiment of the utility model;

[0021] Figure 2 yes Figure 1 The enlarged view of point B in FIG.

[0022] Figure 3 yes Figure 1 Schematic diagram of the middle eccentric sleeve;

[0023] Figure 4 yes Figure 1 A plan view of the middle casing;

[0024] Figure 5 It is a schematic diagram after the lubricating oil in the lubricating oil channel structure in the electric compressor is extracted separately;

[0025] Figure 6 It is the fluid dynamics simulation result diagram of the lubricating oil channel structure.

[0026] In the figure: 1-casing, 1a-first bearing hole, 1b-hole groove, 2-first bearing, 3-crankshaft, 3a-crank pin, 3b-first oil channel, 3c-second oil channel, 4-main bearing, 5-front cover, 5a-front cover cavity, 6-eccentric sleeve, 6a-first lubricating oil channel, 6b-oil storage cavity, 6c-spiral groove, 6d-oil groove, 7-moving plate, 7a-second bearing hole, 8-second bearing, 9-static plate, 10-rear cover. DETAILED DESCRIPTION

[0027] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 4As shown, the electric compressor with a lubricating oil passage of this embodiment includes a casing 1 on which a crankshaft 3 is installed, a stator plate 9 and a movable plate 7 assembled in the casing 1, a main bearing 4 is arranged between the middle part of the crankshaft 3 and the casing, a front cover 5 is connected to the back of the movable plate 7, a front cover cavity 5a is arranged in the front cover 5, a rear cover 10 is connected to the back of the stator plate 9, a first bearing hole 1a is arranged in the casing 1, a second bearing hole 7a is arranged in the back of the movable plate 7, a first bearing 2 and a second bearing 8 are respectively installed in the first bearing hole 1a and the second bearing hole 7a, an eccentric sleeve 6 is rotatably assembled in the second bearing 8, one end of the crankshaft 3 is fixedly connected to the eccentric sleeve 6, and the other end is rotatably connected to the second bearing 2 The eccentric sleeve 6 is matched with a first lubricating oil passage 6a inside, which is arranged along the axial direction of the eccentric sleeve and runs through the entire eccentric sleeve 6. The crankshaft 3 is provided with a second lubricating oil passage, which is arranged along the circumferential direction of the crankshaft and runs through the entire crankshaft 3. The first lubricating oil passage 6a is connected with the second lubricating oil passage and is arranged alternately; the crankshaft 3 is connected to the eccentric sleeve 6 through the crank pin 3a, and the second lubricating oil passage includes a first section of oil passage 3b and a second section of oil passage 3c that are connected together. The diameter of the first section of oil passage 3b is smaller than the diameter of the second section of oil passage 3c. The first section of oil passage 3b is close to the eccentric sleeve 6, and the second section of oil passage 3c is close to the first bearing hole 1a. The axis of the second lubricating oil passage coincides with the axis of the crankshaft 3, and the axis of the first lubricating oil passage 6a is parallel to the axis of the eccentric sleeve 6.

[0029] A spiral groove 6c is provided on the outer circumference of the eccentric sleeve 6, and the two ends of the spiral groove 6c are respectively connected to the two end surfaces of the eccentric sleeve 6. There are two spiral grooves 6c, which are respectively located on both sides of the outer circumference of the eccentric sleeve 6, and the rotation direction of the spiral groove 6c is opposite to the rotation of the crankshaft 3. An oil storage cavity 6b is provided on the end surface of the eccentric sleeve 6 close to the bottom surface of the second bearing hole 7a, and an oil passing groove 6d connected to the spiral groove 6a is provided on the end surface of the eccentric sleeve 6 close to the second bearing hole 7a.

[0030] A hole groove 1b is provided on the bottom surface of the first bearing hole 1a, and there are three hole grooves 1b. The axis of each hole groove 1b is parallel to the crankshaft 3, and each hole groove 1b is located above the axis of the crankshaft 3. The distance between the center of each hole groove 1b and the center of the first bearing hole 1b is equal.

[0031] When the electric compressor is running, the refrigerant and lubricating oil are compressed and the oil and gas are separated, and then stored in the front cover cavity 5a. When the storage amount of lubricating oil reaches a certain amount, it will enter the oil storage cavity 6b of the eccentric sleeve 6. The eccentric sleeve 6 is installed on the crank pin 3a of the crankshaft 3. The outer diameter of the eccentric sleeve 6 is clearance-matched with the second bearing 8. The second bearing 8 is installed in the second bearing hole 7a through interference fit. Two spiral grooves 6c are provided on the side wall of the eccentric sleeve 6. The rotation direction of the spiral groove 6c is opposite to that of the crankshaft 3. Two oil-passing grooves 6d are designed on the end face of the eccentric sleeve 6. The oil-passing grooves 6d connect the oil storage cavity 6b and the spiral grooves 6c. Therefore, when the crankshaft 3 rotates, a part of the lubricating oil between the eccentric sleeve 6 and the second bearing hole 7a flows along the two spiral grooves 6c and is stored in these two spiral grooves 6c, which can fully Lubricate the second bearing 8; another part of the lubricating oil passes through the first lubricating oil channel 6a in the eccentric sleeve 6 under the action of the pressure difference. The center lines of the first lubricating oil channel 6 and the second lubricating oil channel of the crankshaft are offset and correspond to each other, but are interconnected. The purpose is to reduce the flow cross-sectional area, thereby playing a throttling role. The lubricating oil enters the first bearing 2 from the first lubricating oil channel 6a through the first section oil channel 3b and the second section oil channel 3c in sequence. The first bearing 2 is press-fitted into the first bearing hole 1a of the casing 1 through an interference fit. Three hole grooves 1b are opened in the upper position of the first bearing hole 1a. The three hole grooves 1b are located above the compressor axis. The purpose is to store the lubricating oil in the gap between the first bearing 2 and the outer diameter of the crankshaft 3. When the lubricating oil is full, it can overflow from the three hole grooves 1b and enter the casing 1 again, and be entrained by the refrigerant to enter the next cycle again.

[0032] The utility model discloses a lubricating oil passage structure of an electric compressor in an embodiment, which includes a first lubricating oil passage 6a provided in an eccentric sleeve 6, a second lubricating oil passage provided in a crankshaft 3, and a spiral groove 6c provided on the outer periphery of the eccentric sleeve 6. The first lubricating oil passage is arranged along the axial direction of the eccentric sleeve 6 and runs through the entire eccentric sleeve 6. The second lubricating oil passage is arranged along the circumferential direction of the crankshaft 3 and runs through the entire crankshaft 3. The first lubricating oil passage 6a is connected with the second lubricating oil passage and is arranged alternately. The axis of the second lubricating oil passage coincides with the axis of the crankshaft 3, and the axis of the first lubricating oil passage 6a is parallel to the axis of the eccentric sleeve 6. The second lubricating oil passage includes a first section oil passage 3b and a second section oil passage 3c which are connected together. The diameter of the first section oil passage 3b is smaller than the diameter of the second section oil passage 3c. The first section oil passage 3b is close to the eccentric sleeve 6, and the second section oil passage 3c is close to the first bearing hole 1a.

[0033] The two ends of the spiral groove 6c are respectively connected to the two end surfaces of the eccentric sleeve 6. The lubricating oil passage structure of the electric compressor also includes an oil storage chamber 6b, which is arranged on the end surface of the eccentric sleeve 6 close to the second bearing hole 7a, and the end surface of the eccentric sleeve 6 close to the bottom surface of the second bearing hole 7a is provided with an oil passing groove 6d connected to the spiral groove 6c. There are two spiral grooves 6c, which are respectively located on both sides of the outer periphery of the eccentric sleeve 6, and the rotation direction of the spiral groove 6c is opposite to the rotation direction of the crankshaft 3.

[0034] The lubricating oil channel structure of the electric compressor also includes a hole groove 1b opened on the bottom surface of the first bearing hole 1a, and there are three hole grooves 1b. The axis of each hole groove 1b is parallel to the crankshaft 3, and each hole groove 1b is located above the axis of the crankshaft 3. The distance between the center of each hole groove 1b and the center of the first bearing hole 1a is equal.

[0035] The utility model provides two spiral grooves on the side wall of the eccentric sleeve, and the rotation direction is opposite to that of the crankshaft. Lubricating oil can be stored in the spiral grooves, thereby increasing the lubrication flow of the second bearing, and at the same time, the temperature of the second bearing can be reduced, thereby extending the service life of the second bearing. The eccentric sleeve and the crankshaft are provided with oil passages that are interconnected and staggered, and the throttling purpose is achieved by reducing the cross-sectional area, so that the lubricating oil can fully lubricate between the eccentric sleeve and the second bearing, and then enter the first bearing through the oil passage in the crankshaft. Because the first bearing bears a smaller load than the second bearing when the compressor is working, and is in a low-pressure and low-temperature zone, it is only necessary to provide an overflow hole for the lubricating oil on the upper side of the first bearing hole to meet the flow requirement. The overflow hole for the lubricating oil is located above the axis of the compressor, so as to better store the lubricating oil. When the oil volume reaches a certain level, it can overflow, and after overflowing, it is entrained by the refrigerant and participates in the circulation again.

[0036] Extract the lubricating oil channel fluid domain separately. Figure 5 As shown, through fluid dynamics simulation analysis, Figure 6 In the figure, red represents the volume distribution of liquid lubricating oil, and blue represents the volume distribution of gaseous refrigerant. It can be seen that part of the red liquid lubricating oil flows from the oil storage chamber 6b of the eccentric sleeve to the two spiral grooves 6c, and the other part enters the second lubricating oil channel through the first lubricating oil channel 6a, and passes through the first oil channel 3b and the second oil channel 3c in turn, and is finally stored in the motor housing, and is carried by the refrigerant to participate in the circulation again, thereby increasing the flow rate at the first bearing 2 and the second bearing 8, which can meet the requirements of the lubricating oil flow rate of the electric compressor under high speed state, and reduce the weight of the whole electric compressor, saving production costs.

[0037] The above embodiments are preferred embodiments of the present invention, and the basic principles and main features of the present invention and the advantages of the present invention are shown and described above. Without departing from the spirit and scope of the present invention, the present invention may also have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An electric compressor with a lubricating oil passage, comprising a housing with a crankshaft installed, a stator and a moving plate installed in the housing, a front cover connected to the back of the moving plate, a rear cover connected to the back of the stator, a first bearing hole provided in the housing, a second bearing hole provided on the back of the moving plate, a first bearing and a second bearing respectively interference-fitted in the first bearing hole and the second bearing hole, an eccentric sleeve rotatably installed in the second bearing, one end of the crankshaft is fixedly connected to the eccentric sleeve, and the other end is rotatably matched with the second bearing, characterized in that: A first lubricating oil passage is provided inside the eccentric sleeve, and the first lubricating oil passage is arranged along the axial direction of the eccentric sleeve and runs through the entire eccentric sleeve. A second lubricating oil passage is provided in the crankshaft, and the second lubricating oil passage is arranged along the circumferential direction of the crankshaft and runs through the entire crankshaft. The first lubricating oil passage is connected to the second lubricating oil passage and is arranged alternately. A spiral groove is provided on the outer circumferential surface of the eccentric sleeve, and the two ends of the spiral groove are respectively connected to the two end surfaces of the eccentric sleeve.

2. The electric compressor with lubricating oil passage according to claim 1, characterized in that: An oil storage cavity is provided on the end surface of the eccentric sleeve close to the bottom surface of the second bearing hole, and an oil passing groove connected to the spiral groove is provided on the end surface of the eccentric sleeve close to the second bearing hole.

3. The electric compressor with lubricating oil passage according to claim 1, characterized in that: There are two spiral grooves, which are respectively located on two sides of the outer periphery of the eccentric sleeve, and the rotation direction of the spiral groove is opposite to the rotation direction of the crankshaft.

4. The electric compressor with lubricating oil passage according to claim 1, characterized in that: The second lubricating oil passage comprises a first section oil passage and a second section oil passage which are connected together, the diameter of the first section oil passage is smaller than the diameter of the second section oil passage, the first section oil passage is close to the eccentric sleeve, and the second section oil passage is close to the first bearing hole.

5. The electric compressor with lubricating oil passage according to claim 1, characterized in that: The axis of the second lubricating oil passage coincides with the axis of the crankshaft, and the axis of the first lubricating oil passage is parallel to the axis of the eccentric sleeve.

6. The electric compressor with lubricating oil passage according to claim 1, characterized in that: There are three hole grooves on the bottom surface of the first bearing hole. The axis of each hole groove is parallel to the crankshaft, and each hole groove is located above the crankshaft axis. The distance between the center of each hole groove and the center of the first bearing hole is equal.

7. A lubricating oil passage structure of an electric compressor according to claim 1, characterized in that: It includes a first lubricating oil channel opened in the eccentric sleeve, a second lubricating oil channel opened in the crankshaft, and a spiral groove opened on the outer periphery of the eccentric sleeve. The first lubricating oil channel is arranged along the axial direction of the eccentric sleeve and runs through the entire eccentric sleeve, and the second lubricating oil channel is arranged along the circumferential direction of the crankshaft and runs through the entire crankshaft. The first lubricating oil channel is connected to the second lubricating oil channel and is arranged alternately; the two ends of the spiral groove are respectively connected to the two end faces of the eccentric sleeve.

8. The lubricating oil channel structure of the electric compressor according to claim 7, characterized in that: The lubricating oil channel structure of the electric compressor also includes an oil storage chamber, which is arranged on the end surface of the eccentric sleeve close to the second bearing hole. The end surface of the eccentric sleeve close to the bottom surface of the second bearing hole is provided with an oil passing groove connected to the spiral groove; there are two spiral grooves, which are respectively located on both sides of the outer periphery of the eccentric sleeve, and the rotation direction of the spiral groove is opposite to the rotation direction of the crankshaft.

9. The lubricating oil channel structure of the electric compressor according to claim 7, characterized in that: The second lubricating oil passage includes a first section of oil passage and a second section of oil passage which are connected together. The diameter of the first section of oil passage is smaller than the diameter of the second section of oil passage. The first section of oil passage is close to the eccentric sleeve, and the second section of oil passage is close to the first bearing hole. The axis of the second lubricating oil passage coincides with the axis of the crankshaft, and the axis of the first lubricating oil passage is parallel to the axis of the eccentric sleeve.

10. The lubricating oil channel structure of the electric compressor according to claim 7, characterized in that: The lubricating oil channel structure of the electric compressor also includes a hole groove opened on the bottom surface of the first bearing hole, there are three hole grooves, the axis of each hole groove is parallel to the crankshaft, and each hole groove is located above the crankshaft axis, and the distance between the center of each hole groove and the center of the first bearing hole is equal.

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