Pump body assembly, compressor, and air conditioner

Abstract

The present application belongs to the technical field of compressors. Provided are a pump body assembly, a compressor, and an air conditioner. The pump body assembly comprises an air cylinder and an oil guide structure. A partition plate covers one side of the air cylinder, and a cylinder cover covers the other side of the air cylinder. The air cylinder has a sliding sheet groove allowing a sliding sheet to be mounted. A first oil groove extending in an axial direction of the air cylinder is disposed in a side wall of the sliding sheet groove. The partition plate is provided with an oil hole thereon, and the oil hole is opposite to the side of the sliding sheet away from the cylinder cover and is in communication with the first oil groove. The oil guide structure is configured to guide a lubricating oil to the oil hole, so that the lubricating oil flows into the first oil groove via the oil hole. A backpressure cavity is formed between the side of the sliding sheet away from the partition plate and the cylinder cover, and the oil guide structure is further configured to guide the lubricating oil into the backpressure cavity, so that the backpressure cavity provides force for the sliding sheet to be relatively close to the partition plate. According to the technical scheme of the present application, by means of the arranged backpressure cavity, backpressure can be provided for the sliding sheet to balance the axial impact of the lubricating oil in the oil hole on the sliding sheet, so that the axial stress of the sliding sheet is more balanced, thereby reducing the end surface abrasion of the sliding sheet.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present disclosure claims the priority right of a Chinese patent application filed with China National Intellectual Property Administration on May 23, 2023 with an application number of 202310587378.5 and a title of "Pump Body Assembly, Compressor and Air Conditioner", the entire contents of which are hereby incorporated by reference.TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of compressors, and in particular relates to a pump body assembly, a compressor and an air conditioner.BACKGROUND

[0003] In the global context of green, low-carbon and environmental protection, it has long been a research hotspot in the industry to improve the energy efficiency of compressors of air-conditioners. The energy consumption loss of the compressors can be divided into motor loss, friction loss and indication loss, among which friction loss has always accounted for a significant proportion in the total loss of the compressors. The friction loss of the compressors is an energy consumption loss mainly caused by the friction of friction pairs during movement of the compressor parts, and it is mainly induced by parts such as sliding vanes, eccentric bearings, thrust surfaces, main and auxiliary bearings, rollers, and rotor balance weights. Research has shown that the friction loss of the sliding vanes has always been the largest proportion in the total friction loss of the compressors. As shown in FIG. 1, the proportion of this friction loss is even larger under high-frequency operation, capable of reaching approximately 50% of the total friction loss. Therefore, reducing the friction loss of the sliding vanes is one of the key paths to improve the energy efficiency of the compressors.

[0004] During operation of the compressor, under the action of the pump spring, the sliding vane may reciprocate in the sliding vane slot following the roller, and a large area of contact occurs between side surfaces of the sliding vane and walls of the sliding vane slot, as well as between upper and lower end surfaces of the sliding vane and upper and lower planes of the sliding vane slot, resulting in a large amount of friction loss; as the compressor frequency increases, especially in the high-frequency operation stage, the oil discharge rate inside the compressor increases significantly, leading to a reduction in the oil volume and a substantial drop in the oil level inside the compressor; the oil supply through the spring hole at the tail of the sliding vane slot decreases sharply, resulting in oil shortage of the sliding vane and in the sliding vane slot. This results in a significant increase in the friction power consumption of the sliding vane. In severe cases, it can cause dry friction between the sliding vane and the sliding vane slot as well as at the upper and lower end surfaces, severely wearing the sliding vane and compromising reliability of the compressor. With respect to the problem of wearing of the sliding vane, surface coating is commonly adopted in the art to strengthen the sliding vane to mitigate the wearing, but the sliding vane coating may significantly increase costs of the compressor. Therefore, in order to avoid excessive wearing and ultrahigh costs of the sliding vanes of the compressor, there is an urgent need to design a solution that can ensure sufficient oil supply to the sliding vane.SUMMARY

[0005] In view of this, the present disclosure provides a pump body assembly, a compressor and an air conditioner, and the main technical problems to be solved are: how to improve the axial balance of the sliding vane and reduce the end surface wearing of the sliding vane.

[0006] In order to achieve the above purpose, the present disclosure mainly provides the following technical solution: In a first aspect, in an embodiment of the present disclosure, a pump body assembly is provided, which includes a cylinder and an oil guiding structure, wherein one side of the cylinder is covered with a partition plate, and the other side of the cylinder is covered with a cylinder head; the cylinder is provided with a sliding vane slot for installing a sliding vane; a first oil groove extending along an axial direction of the cylinder is provided in a side wall of the sliding vane slot; an oil hole is provided in the partition plate; the oil hole faces a side of the sliding vane away from the cylinder head, and the oil hole communicates with the first oil groove; the oil guiding structure is configured to guide lubricating oil to the oil hole, so that the lubricating oil flows into the first oil groove through the oil hole, a back pressure chamber is formed between the cylinder head and a side of the sliding vane away from the partition plate, and the oil guiding structure is further configured to guide the lubricating oil into the back pressure chamber, so that the back pressure chamber provides a force to move the sliding vane towards the partition plate in relative motion.

[0007] In some embodiments, the back pressure chamber includes a second oil groove provided in the cylinder head, through which the lubricating oil of the oil guiding structure is received; an opening of the second oil groove faces the side of the sliding vane away from the partition plate, and the back pressure chamber provides the force to move the sliding vane towards the partition plate in relative motion through the lubricating oil inside the second oil groove.

[0008] In some embodiments, the second oil groove communicates with the first oil groove, so that the oil guiding structure guides the lubricating oil to the second oil groove through the first oil groove.

[0009] In some embodiments, a first end of the first oil groove runs through the sliding vane slot along the axial direction of the cylinder, and an opening of the first oil groove at the first end faces the opening of the second oil groove, so that the first oil groove communicates with the second oil groove.

[0010] In some embodiments, the opening of the first oil groove at the first end is adapted in shape to the opening of the second oil groove, such that a projection contour of the opening of the first oil groove at the first end on a plane perpendicular to the axial direction of the cylinder is located on a projection contour of the opening of the second oil groove on the same plane.

[0011] In some embodiments, an opening of the oil hole and the opening of the second oil groove have consistent shapes, and projection contours of these two openings on the plane perpendicular to the axial direction of the cylinder coincide with each other.

[0012] In some embodiments, the opening of the second oil groove extends beyond both sides of the sliding vane in a thickness direction.

[0013] In some embodiments, the pump body assembly further includes an oil return structure configured to guide the lubricating oil inside the first oil groove and the back pressure chamber out to an oil sump.

[0014] In some embodiments, when the back pressure chamber includes the second oil groove provided in the cylinder head, and the second oil groove communicates with the first oil groove, the oil return structure includes an oil guide groove disposed on a side of the sliding vane slot close to the cylinder head; one end of the oil guide groove extends to a junction of the first oil groove and the second oil groove, so that the oil guide groove communicates with both the first oil groove and the second oil groove; the oil return structure guides the lubricating oil inside the first oil groove and the second oil groove out to the oil sump through the other end of the oil guide groove.

[0015] In some embodiments, the number of the cylinders is two, and the partition plate is located between the two cylinders; the number of the cylinder heads is two, which are arranged in one-to-one correspondence with the two cylinders; the number of the back pressure chambers is two, which are arranged in one-to-one correspondence with the two cylinders.

[0016] In a second aspect, a compressor is further provided in the embodiment of the present disclosure, which may include any of the aforementioned pump body assemblies.

[0017] In a third aspect, an air conditioner is further provided in the embodiment of the present disclosure, which may include any of the aforementioned compressors.

[0018] By means of the above technical solution, the pump body assembly, the compressor and the air conditioner in the present disclosure have at least the follow beneficial effects: 1. In the technical solution provided in the present disclosure, more lubricating oil can be provided for the end surface of the sliding vane at the side away from the partition plate through the back pressure chamber provided, so that the friction power consumption is reduced and the energy efficiency of the compressor is improved. In addition, by means of the back pressure chamber provided, back pressure can be provided to the sliding vane to offset the axial impact on the sliding vane by lubricating oil inside the oil hole, so that the axial force on the sliding vane is more balanced, thereby reducing the end surface wearing of the sliding vane; 2. The end surfaces and the side surfaces of the sliding vane do not need to adopt the sliding vane coating technology, which reduces the costs.

[0019] The above description is only an overview of the technical solution of the present disclosure. In order to understand the technical means of the present disclosure more clearly and implement it according to the contents of the description, a detailed explanation is made below with the preferred embodiments of the present disclosure in combination with the accompanying drawings.BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to explain the technical solution in the embodiment of the present disclosure or that in the relevant art more clearly, drawings required for describing the embodiment or the relevant art will be briefly introduced below. Obviously, the attached drawings described below are only some examples of the present disclosure. For those skilled in the art, other drawings can also be obtained according to the structure shown in these drawings without paying inventive effort. FIG. 1 is a schematic view showing the proportion of friction loss in each part of the compressor; FIG. 2 is a schematic structural view of a pump body assembly provided in an embodiment of the present disclosure; FIG. 3 is a schematic structural view of the pump body assembly of FIG. 2 with the sliding vane hidden; FIG. 4 is an enlarged schematic view of part A of FIG. 3; FIG. 5 is a schematic view showing the cooperation of the sliding vane with the first oil groove and the second oil groove on the pump body assembly provided in an embodiment of the present disclosure; FIG. 6 is an enlarged schematic view of part B of FIG. 5; FIG. 7 is a structural schematic view of the upper flange provided in an embodiment of the present disclosure; FIG. 8 is a top view of the upper cylinder provided in an embodiment of the present disclosure; FIG. 9 is a bottom view of the upper cylinder provided in an embodiment of the present disclosure; FIG. 10 is a structural schematic view of the partition plate provided in an embodiment of the present disclosure; FIG. 11 is a cross-sectional view of the partition plate provided in an embodiment of the present disclosure; FIG. 12 is a top view of the lower cylinder provided in an embodiment of the present disclosure; FIG. 13 is a bottom view of the lower cylinder provided in an embodiment of the present disclosure; FIG. 14 is a structural schematic view of the lower flange provided in an embodiment of the present disclosure.

[0021] Reference signs: 1. crankshaft; 2. upper flange; 3. upper muffler; 4. cylinder; 5. partition plate; 6. cylinder head; 7. upper roller; 8. lower roller; 9. lower flange; 10. lower muffler; 11. oil guide sheet; 12. oil suction pipe; 13. upper screw; 14. lower screw; 15. oil plug; 16. sliding vane; 101. upper eccentric oil hole; 102. upper eccentric oil groove; 103. lower eccentric oil hole; 104. lower eccentric oil groove; 201. second oil groove; 401. first oil groove; 402. oil guide groove; 403. vertical spring hole; 404. transverse spring hole; 405. oblique notch; 406. sliding vane slot; 501. transverse hole; 502. oil hole; 503. partition plate central hole; 504. oil plug hole.DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present disclosure will be clearly and completely described with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure other than the whole embodiments. All other embodiments that are obtained by those skilled in the art based on the embodiments of the present disclosure without paying inventive effort fall within the protection scope of the present disclosure.

[0023] It should be noted that if there are directional indications (such as upper, lower, left, right, front, rear, ...) involved in the embodiments of the present disclosure, these directional indications are only used to explain the relative positional relationship, movement status, etc. between various components under a specific posture (as shown in the figures). If this specific posture changes, the directional indications will also change accordingly.

[0024] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present disclosure, such descriptions of "first", "second" and the like are only used for convenience of description, and shall not be understood as indicating or implying their relative importance or implicitly specifying the number of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of several embodiments may be combined with each other, but this must be based on the realizability by those of ordinary skill in the art. When the combination of technical solutions leads to contradiction or is impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope claimed by the present disclosure.

[0025] Based on the problems of low energy efficiency and poor reliability caused by insufficient oil supply to the sliding vanes of conventional compressors at high frequencies in related art, our company has made a thorough comparative analysis on the relevant arts and proposed an innovative patent proposal of A Wear Reduction System for Sliding Vanes of Rolling-Rotor Dual-Cylinder Compressors (Application No.: 202210648504.9). By providing intersecting transverse oil holes and vertical oil holes on the partition plate at positions corresponding to the sliding vane slots to supply oil to the sliding vane slots on the cylinder, this solution can significantly enhance the lubrication on both side surfaces of the sliding vanes, and produce the beneficial effects of reducing frictional power consumption and improving reliability. However, in this solution, the vertical oil holes provided in the partition plate are opposite to the sliding vanes, and the high-pressure lubricating oil in the vertical oil holes may cause the upper sliding vane to bear an upward axial force and the lower slider to bear a downward axial force, thereby leading to abnormal wearing between the upper end surface of the upper sliding vane and the upper flange surface, as well as between the lower end surface of the lower sliding vane and the lower flange surface. This not only increases the power consumption of end surfaces of the sliding vane but may also bring about a new problem concerning reliability. Therefore, there is an urgent need to address this situation.

[0026] As shown in FIGS. 2 and 3, a pump body assembly provided in an embodiment of the present disclosure includes a cylinder 4 and an oil guiding structure. One side of the cylinder 4 is covered with a partition plate 5, and the other side of the cylinder 4 is covered with a cylinder head 6. The number of the cylinders 4 is two or more, and the partition plate 5 is arranged between every two adjacent cylinders 4. Both the uppermost cylinder 4 and the lowermost cylinder 4 are each provided with a cylinder head 6. The cylinder head 6 of the uppermost cylinder 4 may be integrally formed with an upper flange 2, and the cylinder head 6 of the lowermost cylinder 4 may be integrally formed with a lower flange 9.

[0027] The cylinder 4 is provided with a sliding vane slot 406 for installing a sliding vane 16. A side wall of the sliding vane slot 406 is provided with a first oil groove 401 extending along an axial direction of the cylinder, the first oil groove 401 can run through both axial ends of the cylinder. The partition plate 5 is provided with an oil hole 502, which may be a vertical oil hole. The oil hole 502 faces a side of the sliding vane 16 away from the cylinder head 6, and the oil hole 502 is in communication with the first oil groove 401. In some embodiments, the oil hole 502 faces an opening of the first oil groove 401 on a side close to the partition plate 5, so that the oil hole 502 is in communication with the first oil groove 401.

[0028] The aforementioned oil guiding structure is configured to guide the lubricating oil to the oil hole 502, so that the lubricating oil flows into the first oil groove 401 through the oil hole 502. The structure of the oil guiding structure for guiding the lubricating oil into the oil hole 502 is of related art and will not be repeated here. As the oil hole 502 faces the side of the sliding vane 16 away from the cylinder head 6, the lubricating oil in the oil hole 502 can flow into the sliding vane slot 406 and lubricate the side of the sliding vane 16 away from the cylinder 4. After flowing into the first oil groove 401, the lubricating oil can also lubricate the side surfaces of the sliding vane 16. In a specific application example, as shown in FIGS. 8 and 9, there are two first oil grooves 401, which are arranged on the two opposite side walls of the sliding vane slot 406 respectively. The lubricating oil in the two first oil grooves 401 can lubricate the two side surfaces of the sliding vane 16.

[0029] A back pressure chamber is formed between the cylinder head 6 and a side of the sliding vane 16 away from the partition plate 5. The oil guiding structure is further configured to guide the lubricating oil into the back pressure chamber to enable the back pressure chamber to provide a force to move the sliding vane 16 towards the partition plate 5 in relative motion.

[0030] In the above example, by providing the back pressure chamber, more lubricating oil can be supplied to the end surface of the sliding vane 16 at the side away from the partition plate 5, thereby reducing frictional power consumption and improving the energy efficiency of the compressor. In addition, the back pressure chamber can provide back pressure to the sliding vane 16 to offset the axial impact on the sliding vane 16 by the lubricating oil inside the oil hole 502, thus making the axial force on the sliding vane 16 more balanced. As a result, the end surface wearing of the sliding vane 16 can be reduced.

[0031] In a specific application example, as shown in FIGS. 4 to 6, the aforementioned back pressure chamber may include a second oil groove 201 provided on the cylinder head 6, and the back pressure chamber receives the lubricating oil of the oil guiding structure through the second oil groove 201. An opening of the second oil groove 201 faces the side of the sliding vane 16 away from the partition plate 5, and the back pressure chamber provides the force to move the sliding vane 16 towards the partition plate 5 in relative motion through the lubricating oil inside the second oil groove 201.

[0032] In the above example, the back pressure chamber receives the lubricating oil through the second oil groove 201 and provides back pressure to the sliding vane 16. The second oil groove 201 is disposed on a side of the cylinder head 6 close to the sliding vane 16, thus having the advantage of facilitating processing.

[0033] The aforementioned second oil groove 201 can be in communication with the first oil groove 401, so that the oil guiding structure guides the lubricating oil to the second oil groove 201 through the first oil groove 401. In some embodiments, a first end of the first oil groove 401 runs through the sliding vane slot 406 along the axial direction of the cylinder 4, and an opening of the first oil groove 401 at the first end faces the opening of the second oil groove 201, so that the first oil groove 401 and the second oil groove 201 communicate with each other.

[0034] In the above example, the first oil groove 401 can serve as part of the oil guiding structure to guide oil to the second oil groove 201, eliminating the need for an additional separate oil passage to supply oil to the second oil groove 201. This offers the advantage of a simplified structure, making the overall oil guiding structure more compact.

[0035] In a specific application example, as shown in FIGS.7 and 8, the opening of the first oil groove 401 at the first end is adapted in shape to the opening of the second oil groove 201, such that a projection contour of the opening of the first oil groove 401 at the first end on a plane perpendicular to the axial direction of the cylinder is located on a projection contour of the opening of the second oil groove 201 on the same plane. For instance, the projection contour of the opening of the second oil groove 201 on a plane perpendicular to the axial direction of the cylinder is waist-shaped, and the projection contour of the opening of the first oil groove 401 at the first end on the plane perpendicular to the axial direction of the cylinder is arc-shaped, and this arc shape coincides with an arc segment of the waist shape. This design is mainly intended to facilitate the smooth flow of the lubricating oil from the first oil groove 401 into the second oil groove 201, so as to reduce the flow resistance of the lubricating oil.

[0036] In a specific application example, as shown in FIGS. 7 and 10, an opening of the oil hole 502 and the opening of the second oil groove 201 have consistent shapes, and the projection contours of these two openings on the plane perpendicular to the axial direction of the cylinder coincide with each other. For example, the projection contours of these two openings on the plane perpendicular to the axial direction of the cylinder are both waist-shaped and coincide with each other. This design is mainly intended to enable the lubricating oil inside the oil hole 502 and the second oil groove 201 to provide approximately equivalent axial forces to the sliding vane 16, so as to balance the axial force on the sliding vane 16.

[0037] In some embodiments, as shown in FIG. 6, the opening of the aforementioned second oil groove 201 extends beyond two sides of the sliding vane 16 in the thickness direction. As the openings of the oil hole 502 and the second oil groove 201 have consistent shapes, the opening of the oil hole 502 also extends beyond two sides of the sliding vane 16 in the thickness direction. This design is mainly intended to enable both the oil hole 502 and the second oil groove 201 to provide more sufficient lubricating oil for the end surfaces of the sliding vane 16 on upper and lower sides, so as to improve the lubrication effect on the end surfaces of the sliding vane 16 and further reduce frictional power consumption.

[0038] The aforementioned pump body assembly may further include an oil return structure, which is configured to guide the lubricating oil inside the first oil groove 401 and the back pressure chamber out to an oil sump, thereby forming a circulation of the oil passage. This circulating oil passage, under the reciprocating movement of the sliding vane 16, can not only ensure the lubrication state of both side surfaces of the sliding vane 16 but also maintain the lubrication state of the upper and lower end surfaces of the sliding vane 16. This significantly reduces the frictional power consumption of the sliding vane 16, and meanwhile avoids the problems of sliding vane 16 wearing caused by oil shortage under high-frequency operation of the compressor and of end wearing of the sliding vane 16 due to the bearing of the axial force.

[0039] As shown in FIG. 4, when the back pressure chamber includes the second oil groove 201 provided in the cylinder head 6 and the second oil groove 201 is in communication with the first oil groove 401, the aforementioned oil return structure may include an oil guide groove 402 disposed on a side of the sliding vane slot 406 close to the cylinder head 6. One end of the oil guide groove 402 extends to a junction of the first oil groove 401 and the second oil groove 201, so that the oil guide groove 402 is in communication with both the first oil groove 401 and the second oil groove 201, enabling the lubricating oil inside both the first oil groove 401 and the second oil groove 201 to flow into the oil guide groove 402. The oil return structure guides the lubricating oil inside the first oil groove 401 and the second oil groove 201 out to the oil sump through the other end of the oil guide groove 402.

[0040] In the above example, the provision of the oil guide groove 402, which extends to the junction of the first oil groove 401 and the second oil groove 201, on a side of the sliding vane slot 406 has the advantage of facilitating processing.

[0041] In a specific application example, the number of the cylinders 4 is two, namely an upper cylinder and a lower cylinder. The partition plate 5 is located between the two cylinders 4. Two of the cylinder heads 6 are provided, which are arranged in a one-to-one correspondence with the two cylinders 4. The two cylinder heads 6 are an upper cylinder head and a lower cylinder head respectively, wherein the upper cylinder head is integrally formed with the upper flange 2, and the lower cylinder head is integrally formed with the lower flange 9. There are two back pressure chambers provided, which are arranged in a one-to-one correspondence with the two cylinders 4. In this example, by the two back pressure chambers provided, back pressure can be provided for the sliding vanes 16 in both the upper cylinder and the lower cylinder, so as to balance the axial force on the two sliding vanes 16.

[0042] In an embodiment of the present disclosure, a compressor is further provided, which may include any of the aforementioned pump body assemblies. In the compressor, owing to the aforementioned pump body assembly, the back pressure chamber can provide back pressure for the sliding vane 16 to offset the axial impact on the sliding vane 16 by the lubricating oil inside the oil hole 502, so that the axial force on the sliding vane 16 is more balanced, thereby reducing the end surface wearing of the sliding vane 16.

[0043] In an embodiment of the present disclosure, an air conditioner is further provided, which may include any of the aforementioned compressors. In the air conditioner, owing to the aforementioned compressor, the back pressure chamber can provide back pressure for the sliding vane 16 to offset the axial impact on the sliding vane 16 by the lubricating oil inside the oil hole 502, so that the axial force on the sliding vane 16 is more balanced, thereby reducing the end surface wearing of the sliding vane 16.

[0044] The working principle and preferred embodiment of the present disclosure will be described below.

[0045] The present disclosure is directed to designing a pump body assembly, which may be applied to a compressor, and the compressor may be applied to an air conditioner. In a specific application example, as shown in FIGS. 2 to 14, the pump body assembly includes cylinders 4 and cylinder heads 6. The number of the cylinders 4 may be two, namely an upper cylinder and a lower cylinder. There are two cylinder heads 6 provided, namely an upper cylinder head and a lower cylinder head. The upper cylinder head is integrally formed with the upper flange 2, and the lower cylinder head is integrally formed with the lower flange 9. The pump body assembly further includes a crankshaft 1, which has an upper eccentric portion and a lower eccentric portion. The upper eccentric portion is located inside the upper roller 7, the upper roller 7 is fitted in an inner circle of the upper cylinder, the upper flange 2 and an upper muffler 3 are mounted above the upper cylinder, and upper screws 13 are used to lock the upper muffler 3, the upper flange 2 and the upper cylinder together. The lower eccentric portion is located inside the lower roller 8, the lower roller 8 is fitted in an inner circle of the lower cylinder, the lower flange 9 and a lower muffler 10 are mounted below the lower cylinder, the partition plate 5 is mounted between the lower cylinder and the upper cylinder, and lower screws 14 are used to lock the lower muffler 10, the lower flange 9, the lower cylinder, the partition plate 5 and the upper cylinder together. The crankshaft 1 passes through the central holes of the aforementioned parts respectively. The crankshaft 1 is internally provided at the center with a crankshaft central oil hole, and an oil guide sheet 11 is mounted in the crankshaft central oil hole. An oil suction pipe 12 is mounted at the lower end of the crankshaft central oil hole. The sliding vanes 16 are mounted in the sliding vane slots 406 of both the upper cylinder and the lower cylinder, and a pump spring is arranged at the tail end of each sliding vane 16.

[0046] The above-mentioned rolling-rotor dual-cylinder pump body assembly mainly involves parts such as the crankshaft 1, the oil suction pipe 12, the oil guide sheet 11, the partition plate 5, the oil plug 15, the upper cylinder, the lower cylinder, the sliding vane 16, the upper flange 2 and the lower flange 9. By creating new lubricating oil passages for these parts, it can achieve the purpose of lubricating both the side surfaces and end surfaces of the sliding vane 16. By adding the oil suction pipe 12 at the bottom end of the crankshaft 1 and providing the oil guide sheet 11 in the crankshaft central oil hole, it can ensure that the lubricating oil can still be pumped into the pump body even when the oil level is very low at high frequencies. The lubricating oil inside the crankshaft central oil hole flows to an upper eccentric oil groove 102 and a lower eccentric oil groove 104 through the upper eccentric oil hole 101 and the lower eccentric oil hole 103 respectively, and the upper eccentric oil groove 102 communicates with a lower end surface of the upper eccentric portion, while the lower eccentric oil groove 104 communicates with an upper end surface of the lower eccentric portion. The upper eccentric oil groove 102 and the lower eccentric oil groove 104 both communicate with the partition plate central hole 503, so the lubricating oil can be directly pumped into the partition plate central hole 503. A transverse hole 501 and a vertical hole are provided in the partition plate 5 at the position corresponding to the sliding vane slot 406, and the vertical hole is the aforementioned oil hole 502. The inner side of the transverse hole 501 communicates with the partition plate central hole 503, while the outer side of the transverse hole 501 communicates with an oil plug hole 504, in which an oil plug 15 is provided for sealing. As shown in FIG. 4, the lubricating oil inside the partition plate central hole 503 can be pumped to the sliding vane slot 406 area in the upper and lower cylinders. Both side walls of the sliding vane slots 406 in the upper and lower cylinders are provided with vertical oil grooves, which are the aforementioned first oil grooves 401. These vertical oil grooves communicate with the vertical holes (i.e., the aforementioned oil holes 502) in the partition plate 5. Optimally, the vertical holes in the partition plate 5 are circular holes, and the vertical oil grooves (i.e., the aforementioned first oil grooves 401) in the upper and lower cylinders are semicircular oil grooves. In order to prevent gas in the compression chamber from leaking out of the vertical oil grooves of each cylinder 4, it shall be ensured that the minimum distance d between the first oil groove 401 in the cylinder 4 and the oblique notch 405 of the cylinder 4 is no less than 1 mm. In order to prevent the lubricating oil from leaking out of the spring transverse hole 404, the first oil groove 401 in the cylinder 4 shall not communicate with the spring transverse hole 404.

[0047] The end surface of each cylinder 4 at a side away from the partition plate 5 is provided with an oil guide groove 402 extending from the first oil groove 401 to the spring vertical hole 403. In this way, the lubricating oil inside the oil hole 502 in the partition plate 5 can flow back to the oil sump of the compressor through the first oil groove 401 in the upper cylinder, the oil guide groove 402 in the upper end surface of the upper cylinder, and the spring vertical hole 403 of the upper cylinder, and flow back to the oil sump of the compressor through the first oil groove 401 in the lower cylinder and the oil guide groove 402 in the lower end surface of the lower cylinder. In addition, an end surface oil groove is created in the upper flange 2 at the position corresponding to the first oil groove 401 in the upper cylinder, and this end surface oil groove is the aforementioned second oil groove 201. Thus, the first oil grooves 401 in both sides of the sliding vane slot 406 of the upper cylinder can communicate with each other through the second oil groove 201 in the upper flange 2. An end surface oil groove is also created in the lower flange 9 at the position corresponding to the first oil groove 401 in the lower cylinder, and this end surface oil groove is the aforementioned second oil groove 201. Thus, the first oil grooves 401 in both sides of the sliding vane slot 406 of the lower cylinder can communicate with each other through the second oil groove 201 in the lower flange 9. This circulating oil passage, under the reciprocating movement of the sliding vane 16, can not only ensure the lubrication state of both side surfaces of the sliding vane 16 but also maintain the lubrication state of the upper and lower end surfaces of the sliding vane 16. This significantly reduces the frictional power consumption of the sliding vane 16, and meanwhile avoids the problems of sliding vane 16 wearing caused by oil shortage under high-frequency operation of the compressor and of end wearing of the sliding vane 16 due to bearing of the axial force.

[0048] The vertical oil holes (i.e., the aforementioned oil holes 502) in the partition plate 5, the vertical oil grooves (i.e., the aforementioned first oil grooves 401) in each cylinder 4, and the end surface oil grooves (i.e., the aforementioned second oil grooves 201) in each flange can be circular, waist-shaped, elliptical, or in the shape of their combinations, and they are optimally circular to facilitate processing.

[0049] The technical solution of the present disclosure can solve the following technical problems: 1. the problem of low energy efficiency of the compressor caused by excessive frictional loss of the sliding vane 16; 2. the problem of axial force balancing of the sliding vane 16 to avoid wearing of the sliding vane 16 induced by up-and-down tilting; 3. the reliability problem of severe end surface wearing of the sliding vane 16 caused by oil shortage in the sliding vane slot 406.

[0050] The technical solution of the present disclosure has the following beneficial effects: 1. the oil supply between each friction pair of the compressor is more sufficient, the frictional power consumption is reduced, and the energy efficiency of the compressor is improved; 2. the axial force on the sliding vane 16 is more balanced, and the end surfaces of the sliding vane 16 can get more adequate lubrication, which solves the problem of end surface wearing of the sliding vane 16; 3. the end surfaces and side surfaces of the sliding vane 16 do not need to adopt the sliding vane 16 coating technology, which reduces the cost of the compressor.

[0051] The above is only the preferred embodiment of the present disclosure, and does not limit the patent scope of the present disclosure. Any equivalent structural transformation made according to the contents in the description and figures of the present disclosure and or direct / indirect application in other related technical fields under the inventive concept of this disclosure is included in the patent protection scope of this disclosure.

Claims

1. A pump body assembly, comprising a cylinder (4) and an oil guiding structure, wherein one side of the cylinder (4) is covered with a partition plate (5), and the other side of the cylinder (4) is covered with a cylinder head (6); the cylinder (4) is provided with a sliding vane slot (406) for installing a sliding vane (16); a first oil groove (401) extending along an axial direction of the cylinder (4) is provided in a side wall of the sliding vane slot (406); an oil hole (502) is provided in the partition plate (5); the oil hole (502) faces a side of the sliding vane (16) away from the cylinder head (6), and the oil hole (502) communicates with the first oil groove (401); the oil guiding structure is configured to guide lubricating oil to the oil hole (502), so that the lubricating oil flows into the first oil groove (401) through the oil hole (502), a back pressure chamber is formed between the cylinder head (6) and a side of the sliding vane (16) away from the partition plate (5), and the oil guiding structure is further configured to guide the lubricating oil into the back pressure chamber, so that the back pressure chamber provides a force to move the sliding vane (16) towards the partition plate (5) in relative motion.

2. The pump body assembly according to claim 1, wherein the back pressure chamber comprises a second oil groove (201) provided in the cylinder head (6), through which the lubricating oil of the oil guiding structure is received; an opening of the second oil groove (201) faces the side of the sliding vane (16) away from the partition plate (5), and the back pressure chamber provides the force to move the sliding vane (16) towards the partition plate (5) in relative motion through the lubricating oil inside the second oil groove (201).

3. The pump body assembly according to claim 2, wherein the second oil groove (201) communicates with the first oil groove (401), so that the oil guiding structure guides the lubricating oil to the second oil groove (201) through the first oil groove (401).

4. The pump body assembly according to claim 3, wherein a first end of the first oil groove (401) runs through the sliding vane slot (406) along the axial direction of the cylinder (4), and an opening of the first oil groove (401) at the first end faces the opening of the second oil groove (201), so that the first oil groove (401) communicates with the second oil groove (201).

5. The pump body assembly according to claim 4, wherein the opening of the first oil groove (401) at the first end is adapted in shape to the opening of the second oil groove (201), such that a projection contour of the opening of the first oil groove (401) at the first end on a plane perpendicular to the axial direction of the cylinder (4) is located on a projection contour of the opening of the second oil groove (201) on the same plane.

6. The pump body assembly according to any one of claims 2 to 5, wherein an opening of the oil hole (502) and the opening of the second oil groove (201) have consistent shapes, and projection contours of these two openings on the plane perpendicular to the axial direction of the cylinder (4) coincide with each other.

7. The pump body assembly according to claim 6, wherein the opening of the second oil groove (201) extends beyond both sides of the sliding vane (16) in a thickness direction.

8. The pump body assembly according to any one of claims 1 to 5 and 7, further comprising an oil return structure configured to guide the lubricating oil inside the first oil groove (401) and the back pressure chamber out to an oil sump.

9. The pump body assembly according to claim 8, wherein when the back pressure chamber comprises the second oil groove (201) provided in the cylinder head (6), and the second oil groove (201) communicates with the first oil groove (401), the oil return structure comprises an oil guide groove (402) disposed on a side of the sliding vane slot (406) close to the cylinder head (6); one end of the oil guide groove (402) extends to a junction of the first oil groove (401) and the second oil groove (201), so that the oil guide groove (402) communicates with both the first oil groove (401) and the second oil groove (201); the oil return structure guides the lubricating oil inside the first oil groove (401) and the second oil groove (201) out to the oil sump through the other end of the oil guide groove (402).

10. The pump body assembly according to any one of claims 1 to 5, 7, and 9, wherein: the number of the cylinders (4) is two, and the partition plate (5) is located between the two cylinders (4); the number of the cylinder heads (6) is two, which are arranged in one-to-one correspondence with the two cylinders (4); the number of the back pressure chambers is two, which are arranged in one-to-one correspondence with the two cylinders (4).

11. A compressor, comprising the pump body assembly according to any one of claims 1 to 10.

12. An air conditioner, comprising the compressor according to claim 11.

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