Partition groove type oil distribution crankcase for refrigeration compressor

Abstract

The invention discloses a partition groove type oil distribution crankcase for a refrigeration compressor, and aims to provide a partition groove type oil distribution crankcase which can effectively solve the problem that the cylindricity precision of a friction working surface of a piston is influenced due to the arrangement of a U-shaped groove and can better control the cylindricity precision of a piston working hole matched with the piston; the partition groove type oil distribution crankcase for the refrigeration compressor can effectively solve the problem that the refrigeration efficiency of a refrigerator is reduced due to the fact that oil enters a friction working face of a piston from a U-shaped groove and then enters a refrigeration system of the refrigerator to participate in external circulation under the condition that assembly of an air cylinder assembly is not affected. The cylinder head is provided with a cylinder hole and a mounting groove, and the mounting groove is located above the cylinder hole and communicated with the cylinder hole. The oil cylinder further comprises a pipe sleeve, the pipe sleeve is embedded in the air cylinder hole, an inner hole of the pipe sleeve forms a piston working hole matched with the piston, the pipe sleeve blocks the installation groove, and therefore oil entering the piston working hole from the installation groove is blocked.

Description

Technical Field

[0001] The invention relates to the field of refrigeration compressors, and in particular to a partition groove type oil separation crankcase for a refrigeration compressor. Background Art

[0002] With the continuous improvement of energy-saving requirements for household appliances and the introduction of new standards for refrigerator energy consumption testing (with more stringent requirements), customers have also put forward higher requirements for refrigerator power consumption. As the "heart" of the refrigerator, the compressor, its energy consumption accounts for more than 60% of the total energy consumption of the refrigerator. Therefore, it is not difficult to see that the key to refrigerator energy saving lies in improving the energy consumption of the compressor. In the field of refrigeration compressors, piston reciprocating compressors are the most widely used. This type of compressor is not only compact in structure and high in efficiency, but also exhibits excellent performance in environmental adaptability and operating stability.

[0003] In order to achieve the energy-saving goal of reciprocating refrigerator compressors, we can start from many aspects, one of the important aspects is to start from the oil discharge volume of the compressor. At present, the lubrication method of most refrigeration compressors is refrigeration oil lubrication, and the refrigeration oil participates in the internal circulation and external circulation of the compressor inside the compressor. Internal circulation means that this part of the oil only flows inside the compressor, and the internal circulation has a great effect on the performance of the compressor. On the one hand, reasonable oil internal circulation can ensure the internal lubrication of the crankcase, form a lubricating film on the surface of the friction pair at many places, reduce the friction between the crankshaft and the bearing, and increase the life of the compressor. On the other hand, sufficient internal lubricating oil can absorb and take away most of the heat of the compressor during operation, preventing overheating.

[0004] However, in the actual cycle, part of the refrigerant oil will become oil droplets, and enter the cylinder along with the refrigerant vapor along with the reciprocating motion of the piston, and be discharged from the exhaust port into the refrigerator refrigeration system to participate in the external circulation. However, too much refrigerant oil blending into the refrigerant to participate in the refrigeration cycle will have a side effect on energy consumption. On the one hand, the lubricating oil forms an oil film on the wall of the heat exchanger flow channel in the refrigeration system, thereby reducing the heat transfer efficiency. On the other hand, part of the refrigerant will dissolve in the oil and no longer continue to participate in the refrigeration cycle, resulting in a decrease in refrigeration efficiency. In summary, in order to reduce refrigerator energy consumption, improve refrigeration efficiency, improve compressor oil discharge, and improve the compressor's internal oil circulation capacity is an important research direction.

[0005] The improvement methods currently commonly used in the industry are: 1. Reduce the amount of oil injection while ensuring lubrication capacity.

[0006] 2. Increase the screw torque to improve the sealing performance between the cylinder head and the valve group.

[0007] 3. Set up an oil guide structure on the crankcase to divert part of the oil.

[0008] 4. Control the direction of crankshaft oil throwing, and control the direction and amount of oil splashing.

[0009] 5. Strengthen the airtightness of the muffler.

[0010] Some of the above measures are difficult to implement and have contradictions. For example, reducing the amount of oil injection has a complex verification process and requires full verification of reliability. Increasing the torque of the screw will aggravate the deformation of the cylinder bore and cause abnormal wear. If an oil guide structure is set on the crankcase, if it is an integrated structure with the casting, the casting yield will be affected, and the machining fixture may need to be redesigned. Although the welded muffler structure can improve the air tightness of the muffler, compared with the plug-in muffler, there is an additional welding process, and the production efficiency will decrease.

[0011] like Fig.11 As shown, when the actual compressor is designed, in the cylinder assembly assembly area, in order to ensure the assembly of the cylinder assembly (including the crankshaft, connecting rod, piston pin and piston) on the crankcase, it is necessary to open a finger-cap-sized mounting groove 3 (generally in a U shape, usually called a U-shaped groove) above the cylinder hole 1.1 of the crankcase cylinder head 1. The U-shaped groove is connected to the inner wall of the cylinder hole, and the U-shaped groove is connected to one end of the cylinder hole. The inventor found that the setting of the U-shaped groove structure, on the one hand, makes the wall thickness of the cylinder hole vary greatly, and during the machining of the cylinder hole, it is easy to affect the cylindrical accuracy of the piston friction working surface (i.e., the inner wall surface of the cylinder hole) that cooperates with the piston due to uneven force on the tool; on the other hand, the oil splashed from the crankshaft to the cylinder will enter the piston friction working surface from the U-shaped groove above the cylinder head, enter the cylinder with the reciprocating motion of the piston, and enter the refrigerator refrigeration system to participate in the external circulation, resulting in a decrease in the refrigerator refrigeration efficiency. Summary of the invention

[0012] The purpose of the present invention is to provide a partition groove type oil separation crankcase for a refrigeration compressor which can effectively solve the problem that the cylindricity accuracy of the piston friction working surface is affected by the setting of the U-shaped groove, and can better control the cylindricity accuracy of the piston working hole that cooperates with the piston; and can also effectively solve the problem that the oil enters the piston friction working surface through the U-shaped groove and enters the refrigerator refrigeration system to participate in the external circulation, resulting in a decrease in the refrigeration efficiency of the refrigerator without affecting the assembly of the cylinder assembly.

[0013] The technical solution of the present invention is: A groove-type oil-separating crankcase for a refrigeration compressor includes a cylinder head, which is provided with a cylinder hole and a mounting groove, wherein the mounting groove is located above the cylinder hole and communicated with the cylinder hole; and also includes a pipe sleeve, which is embedded in the cylinder hole, and the inner hole of the pipe sleeve constitutes a piston working hole that cooperates with the piston, and the pipe sleeve blocks the mounting groove, thereby blocking the oil that enters the piston working hole from the mounting groove. Compared with the prior art that uses the inner side surface of the cylinder hole as the piston friction working surface, there is a problem that the setting of the U-shaped groove structure will not only affect the machining cylindricity accuracy of the piston friction working surface that cooperates with the piston; and the oil will enter the piston friction working surface from the U-shaped groove, enter the cylinder with the reciprocating motion of the piston, and enter the refrigerator refrigeration system to participate in the external circulation, resulting in a decrease in the refrigerator refrigeration efficiency; this solution embeds the pipe sleeve in the cylinder hole and blocks the mounting groove, and uses the inner hole of the pipe sleeve as the piston working hole that cooperates with the piston, that is, the inner hole surface of the pipe sleeve is used as the piston friction working surface, and the pipe sleeve and The cylinder head is manufactured in two parts. Thus, on the one hand, the pipe sleeve can effectively block the oil entering the working hole of the piston from the mounting groove (that is, the sleeve blocks the oil entering the friction working surface of the piston from the mounting groove), thereby effectively solving the problem in the prior art that the oil enters the friction working surface of the piston from the U-shaped groove and enters the refrigerator refrigeration system to participate in the external circulation, resulting in a decrease in the refrigeration efficiency of the refrigerator; on the other hand, during actual assembly, the mounting groove can be used to assemble the cylinder assembly (including the crankshaft, connecting rod, piston pin and piston), and then the pipe sleeve can be embedded in the cylinder hole, thereby not affecting the assembly of the cylinder assembly.

[0014] In addition, since the inner hole of the sleeve is used as the piston working hole that cooperates with the piston, and the wall thickness of the sleeve is evenly distributed, the processing of the piston working hole can be better controlled, thereby effectively solving the problem of the cylindricity accuracy of the piston friction working surface affected by the setting of the U-shaped groove.

[0015] Preferably, the outer diameters of the outer side of the sleeve are the same at all positions, and the outer side of the sleeve is closely fitted with the inner side of the cylinder hole. After the sleeve of this solution is assembled into the cylinder hole of the cylinder head, the matching surfaces of the sleeve and the cylinder hole are fully matched axially.

[0016] Preferably, two annular protrusions are provided on the outer side of the sleeve, the two annular protrusions are close to or located at the two ends of the sleeve, and the sleeve is tightly fitted with the inner side of the cylinder hole through the annular protrusions. After the sleeve of this solution is assembled into the cylinder hole of the cylinder head, the sleeve and the cylinder hole cooperate through the two annular protrusions, which is conducive to reducing the difficulty of assembly.

[0017] Preferably, an annular protrusion is provided in the middle of the outer side surface of the sleeve, and the sleeve is closely fitted with the inner side surface of the cylinder hole through the annular protrusion, and the annular protrusion and the mounting groove are staggered in the axial direction of the cylinder hole. After the sleeve of this solution is assembled into the cylinder hole of the cylinder head, the sleeve and the cylinder hole are matched through an annular protrusion in the middle of the sleeve, which is conducive to reducing the difficulty of assembly.

[0018] Preferably, one end of the pipe sleeve is provided with a mounting ear extending outward, and the mounting ear is connected to the cylinder head via a connector, and the connector is a screw or pin connection. In this way, the installation reliability and stability of the pipe sleeve can be improved.

[0019] Preferably, the cylinder head is provided with an upper through hole communicating with the upper part of the inner side surface of the cylinder hole, the outer side surface of the pipe sleeve is provided with a pipe sleeve hole, and the upper through hole and the pipe sleeve hole are connected by a connecting member, and the connecting member is a screw or a pin connection. In this way, the installation reliability and stability of the pipe sleeve can be improved.

[0020] Preferably, the mounting groove is connected to the first end of the cylinder hole, and one end of the pipe sleeve is flush with the first end of the cylinder hole. In this way, the pipe sleeve can completely block the mounting groove, and then the pipe sleeve can effectively block the oil entering the piston working hole from the mounting groove.

[0021] Preferably, the length of the sleeve is consistent with the length of the cylinder hole, and the two ends of the sleeve are flush with the two ends of the cylinder hole. In this way, it can be ensured that the sleeve completely blocks the installation groove, and then the sleeve effectively blocks the oil entering the piston working hole from the installation groove.

[0022] Preferably, the length of the tube sleeve is 20-60 mm, the outer diameter of the tube sleeve is φ15-40 mm, and the inner diameter of the tube sleeve is φ5-35 mm.

[0023] Preferably, the wall thickness of the tube sleeve is 0.5-10 mm.

[0024] The beneficial effects of the present invention are: On the one hand, the pipe sleeve can effectively block the oil entering the working hole of the piston from the mounting groove (that is, the sleeve blocks the oil entering the friction working surface of the piston from the mounting groove), thereby effectively solving the problem in the prior art that the oil enters the friction working surface of the piston from the U-shaped groove and enters the refrigerator refrigeration system to participate in the external circulation, resulting in a decrease in the refrigeration efficiency of the refrigerator; on the other hand, during actual assembly, the mounting groove can be used to assemble the cylinder assembly (including the crankshaft, connecting rod, piston pin and piston), and then the pipe sleeve can be embedded in the cylinder hole, so it will not affect the assembly of the cylinder assembly.

[0025] In addition, since the inner hole of the sleeve is used as the piston working hole that cooperates with the piston, and the wall thickness of the sleeve is evenly distributed, the processing cylindricity accuracy of the piston working hole can be better controlled, thereby effectively solving the problem of affecting the cylindricity accuracy of the piston friction working surface due to the setting of the U-shaped groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a schematic structural diagram of an embodiment of a partition-type oil separation crankcase for a refrigeration compressor.

[0027] Figure 2It is a structural schematic diagram of an implementation manner of the pipe sleeve of the present invention.

[0028] Figure 3 It is a structural schematic diagram of a second embodiment of a partition groove type oil separation crankcase for a refrigeration compressor of the present invention.

[0029] Figure 4 It is a structural schematic diagram of a second embodiment of the pipe sleeve of the present invention.

[0030] Figure 5 It is a structural schematic diagram of a third embodiment of a partition groove type oil separation crankcase for a refrigeration compressor of the present invention.

[0031] Figure 6 It is a structural schematic diagram of a third embodiment of the pipe sleeve of the present invention.

[0032] Figure 7 It is a structural schematic diagram of a fourth embodiment of a partition groove type oil separation crankcase for a refrigeration compressor of the present invention.

[0033] Figure 8 It is a structural schematic diagram of a fourth embodiment of the pipe sleeve of the present invention.

[0034] Fig. 9 It is a structural schematic diagram of a fifth embodiment of a partition groove type oil separation crankcase for a refrigeration compressor of the present invention.

[0035] Fig.10 It is a structural schematic diagram of a fifth embodiment of the pipe sleeve of the present invention.

[0036] Fig.11 The invention is a structural schematic diagram of a crankcase in the prior art.

[0037] In the figure: Cylinder head 1, cylinder bore 1.1, upper through hole 1.2; Pipe sleeve 2, piston working hole 2.1, annular protrusion 2.2, mounting ear 2.3, pipe sleeve hole 2.4; Mounting slot 3; Base 4. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Specific embodiment 1, as Figure 1 , Figure 2As shown, a partition-type oil separation crankcase for a refrigeration compressor includes a cylinder head 1 and a pipe sleeve 2. A cylinder hole 1.1 and a mounting groove 3 are provided on the cylinder head 1. The mounting groove 3 is located above the cylinder hole 1.1 and is connected to the cylinder hole 1.1. In this embodiment, the axis of the cylinder hole 1.1 is horizontally distributed. The pipe sleeve 2 is embedded in the cylinder hole 1.1. The inner hole of the pipe sleeve 2 constitutes a piston working hole 2.1 that cooperates with the piston. The inner wall surface of the piston working hole 2.1 is the friction working surface of the piston. The pipe sleeve 2 blocks the mounting groove 3, thereby blocking the oil that enters the piston working hole 2.1 from the mounting groove 3.

[0039] Compared with the prior art that uses the inner side surface of the cylinder hole 1.1 as the piston friction working surface, there is a problem that the setting of the U-shaped groove structure not only affects the machining cylindricity accuracy of the piston friction working surface that cooperates with the piston; and the oil will enter the piston friction working surface through the U-shaped groove, enter the cylinder with the reciprocating motion of the piston, and enter the refrigerator refrigeration system to participate in the external circulation, resulting in a decrease in the refrigerator refrigeration efficiency. In this embodiment, the pipe sleeve 2 is embedded in the cylinder hole 1.1 and the mounting groove 3 is blocked, and the inner hole of the pipe sleeve 2 is used as the piston working hole 2.1 that cooperates with the piston, that is, the inner hole surface of the pipe sleeve 2 is used as the piston friction working surface, and the pipe sleeve 2 is made separately from the cylinder head 1. In this way, on the one hand, the pipe sleeve 2 can effectively block the oil entering the piston working hole 2.1 from the mounting groove 3 (that is, the sleeve blocks the oil entering the piston friction working surface from the mounting groove 3), thereby effectively solving the problem in the prior art that the oil enters the piston friction working surface from the U-shaped groove and enters the refrigerator refrigeration system to participate in the external circulation, resulting in a decrease in the refrigerator refrigeration efficiency; on the other hand, during actual assembly, the cylinder assembly (including the crankshaft, connecting rod, piston pin and piston) can be assembled using the mounting groove 3, and then the pipe sleeve 2 can be embedded in the cylinder hole 1.1, so that the assembly of the cylinder assembly will not be affected.

[0040] In addition, since the inner hole of the sleeve 2 is used as the piston working hole 2.1 that cooperates with the piston, and the wall thickness of the sleeve 2 is evenly distributed, the processing of the piston working hole 2.1 can be better controlled, thereby effectively solving the problem of affecting the cylindricity accuracy of the piston friction working surface due to the setting of the U-shaped groove.

[0041] Specific embodiment 2, as Figure 1 , Figure 2As shown, a partition-type oil separation crankcase for a refrigeration compressor includes a cylinder head 1 and a pipe sleeve 2. A cylinder hole 1.1 and a mounting groove 3 are provided on the cylinder head 1. The mounting groove 3 is located above the cylinder hole 1.1 and is connected to the cylinder hole 1.1. In this embodiment, the axis of the cylinder hole 1.1 is horizontally distributed. The pipe sleeve 2 is embedded in the cylinder hole 1.1. The inner hole of the pipe sleeve 2 constitutes a piston working hole 2.1 that cooperates with the piston. The inner wall surface of the piston working hole 2.1 is the friction working surface of the piston. The pipe sleeve 2 blocks the mounting groove 3, thereby blocking the oil that enters the piston working hole 2.1 from the mounting groove 3.

[0042] In this embodiment, the outer diameters of the outer side of the sleeve 2 are the same at all positions. The outer side of the sleeve 2 is tightly fitted with the inner side of the cylinder hole 1.1. After the sleeve 2 is assembled into the cylinder hole 1.1 of the cylinder head 1, the matching surfaces of the sleeve 2 and the cylinder hole 1.1 are fully matched in the axial direction.

[0043] Compared with the prior art that uses the inner side surface of the cylinder hole 1.1 as the piston friction working surface, there is a problem that the setting of the U-shaped groove structure not only affects the machining cylindricity accuracy of the piston friction working surface that cooperates with the piston; and the oil will enter the piston friction working surface through the U-shaped groove, enter the cylinder with the reciprocating motion of the piston, and enter the refrigerator refrigeration system to participate in the external circulation, resulting in a decrease in the refrigerator refrigeration efficiency. In this embodiment, the pipe sleeve 2 is embedded in the cylinder hole 1.1 and the mounting groove 3 is blocked, and the inner hole of the pipe sleeve 2 is used as the piston working hole 2.1 that cooperates with the piston, that is, the inner hole surface of the pipe sleeve 2 is used as the piston friction working surface, and the pipe sleeve 2 is made separately from the cylinder head 1. In this way, on the one hand, the pipe sleeve 2 can effectively block the oil entering the piston working hole 2.1 from the mounting groove 3 (that is, the sleeve blocks the oil entering the piston friction working surface from the mounting groove 3), thereby effectively solving the problem in the prior art that the oil enters the piston friction working surface from the U-shaped groove and enters the refrigerator refrigeration system to participate in the external circulation, resulting in a decrease in the refrigerator refrigeration efficiency; on the other hand, during actual assembly, the cylinder assembly (including the crankshaft, connecting rod, piston pin and piston) can be assembled using the mounting groove 3, and then the pipe sleeve 2 can be embedded in the cylinder hole 1.1, so that the assembly of the cylinder assembly will not be affected.

[0044] In addition, since the inner hole of the sleeve 2 is used as the piston working hole 2.1 that cooperates with the piston, and the wall thickness of the sleeve 2 is evenly distributed, the processing of the piston working hole 2.1 can be better controlled, thereby effectively solving the problem of affecting the cylindricity accuracy of the piston friction working surface due to the setting of the U-shaped groove.

[0045] In this embodiment, a grooved oil separation crankcase for a refrigeration compressor further includes a base 4, which is integrally formed with a cylinder head 1. The mounting groove 3 is connected to the first end of the cylinder hole 1.1, and the first end of the cylinder hole 1.1 faces the base 4. The pipe sleeve 2 is completed by stamping or machining. The mounting groove is U-shaped. Of course, it should be noted that the mounting groove can also be rectangular or other shapes.

[0046] In one implementation of this embodiment, one end of the sleeve 2 is flush with the first end of the cylinder hole 1.1, so that the sleeve 2 can completely block the installation groove 3, thereby effectively blocking the oil entering the piston working hole 2.1 from the installation groove 3.

[0047] In another implementation of this embodiment, the length of the sleeve 2 is consistent with the length of the cylinder hole 1.1, and the two ends of the sleeve 2 are flush with the two ends of the cylinder hole 1.1. In this way, it can be ensured that the sleeve 2 completely blocks the installation groove 3, and then the sleeve 2 effectively blocks the oil entering the piston working hole 2.1 from the installation groove 3.

[0048] Of course, it should be noted that the two ends of the pipe sleeve 2 may not be flush with the two ends of the cylinder hole 1.1. For example, one end of the pipe sleeve 2 extends to the outside of the first end of the cylinder hole 1.1, or one end of the pipe sleeve 2 is located on the inside of the first end of the cylinder hole 1.1; the other end of the pipe sleeve 2 extends to the outside of the second end of the cylinder hole 1.1, or the other end of the pipe sleeve 2 is located on the inside of the second end of the cylinder hole 1.1.

[0049] In this embodiment, the length of the tube sleeve 2 is 20-60 mm, the outer diameter of the tube sleeve 2 is φ15-40 mm, the inner diameter of the tube sleeve 2 is φ5-35 mm, and the wall thickness of the tube sleeve 2 is 0.5-10 mm.

[0050] Specific embodiment three, as Figure 3 , Figure 4 As shown, a partition-type oil separation crankcase for a refrigeration compressor includes a cylinder head 1 and a pipe sleeve 2. A cylinder hole 1.1 and a mounting groove 3 are provided on the cylinder head 1. The mounting groove 3 is located above the cylinder hole 1.1 and is connected to the cylinder hole 1.1. In this embodiment, the axis of the cylinder hole 1.1 is horizontally distributed. The pipe sleeve 2 is embedded in the cylinder hole 1.1. The inner hole of the pipe sleeve 2 constitutes a piston working hole 2.1 that cooperates with the piston. The inner wall surface of the piston working hole 2.1 is the friction working surface of the piston. The pipe sleeve 2 blocks the mounting groove 3, thereby blocking the oil that enters the piston working hole 2.1 from the mounting groove 3.

[0051] In this embodiment, two annular protrusions 2.2 are provided on the outer side of the pipe sleeve 2. The two annular protrusions 2.2 and the pipe sleeve 2 are an integrally formed structure. The two annular protrusions 2.2 are close to or located at the two ends of the pipe sleeve 2, and the pipe sleeve 2 is tightly fitted with the inner side of the cylinder hole 1.1 through the annular protrusions 2.2. The two annular protrusions 2.2 are close to or located at the two ends of the cylinder hole 1.1. After the pipe sleeve 2 of this solution is assembled into the cylinder hole 1.1 of the cylinder head 1, the pipe sleeve 2 and the cylinder hole 1.1 cooperate through the two annular protrusions 2.2, which is conducive to reducing the difficulty of assembly.

[0052] Compared with the prior art that uses the inner side surface of the cylinder hole 1.1 as the piston friction working surface, there is a problem that the setting of the U-shaped groove structure not only affects the machining cylindricity accuracy of the piston friction working surface that cooperates with the piston; and the oil will enter the piston friction working surface through the U-shaped groove, enter the cylinder with the reciprocating motion of the piston, and enter the refrigerator refrigeration system to participate in the external circulation, resulting in a decrease in the refrigerator refrigeration efficiency. In this embodiment, the pipe sleeve 2 is embedded in the cylinder hole 1.1 and the mounting groove 3 is blocked, and the inner hole of the pipe sleeve 2 is used as the piston working hole 2.1 that cooperates with the piston, that is, the inner hole surface of the pipe sleeve 2 is used as the piston friction working surface, and the pipe sleeve 2 is made separately from the cylinder head 1. In this way, on the one hand, the pipe sleeve 2 can effectively block the oil entering the piston working hole 2.1 from the mounting groove 3 (that is, the sleeve blocks the oil entering the piston friction working surface from the mounting groove 3), thereby effectively solving the problem in the prior art that the oil enters the piston friction working surface from the U-shaped groove and enters the refrigerator refrigeration system to participate in the external circulation, resulting in a decrease in the refrigerator refrigeration efficiency; on the other hand, during actual assembly, the cylinder assembly (including the crankshaft, connecting rod, piston pin and piston) can be assembled using the mounting groove 3, and then the pipe sleeve 2 can be embedded in the cylinder hole 1.1, so that the assembly of the cylinder assembly will not be affected.

[0053] In addition, since the inner hole of the sleeve 2 is used as the piston working hole 2.1 that cooperates with the piston, and the wall thickness of the sleeve 2 is evenly distributed, the processing of the piston working hole 2.1 can be better controlled, thereby effectively solving the problem of affecting the cylindricity accuracy of the piston friction working surface due to the setting of the U-shaped groove.

[0054] In this embodiment, a grooved oil separation crankcase for a refrigeration compressor further includes a base 4, which is integrally formed with a cylinder head 1. The mounting groove 3 is connected to the first end of the cylinder hole 1.1, and the first end of the cylinder hole 1.1 faces the base 4. The pipe sleeve 2 is completed by stamping or machining. The mounting groove is U-shaped. Of course, it should be noted that the mounting groove can also be rectangular or other shapes.

[0055] In one implementation of this embodiment, one end of the sleeve 2 is flush with the first end of the cylinder hole 1.1, so that the sleeve 2 can completely block the installation groove 3, thereby effectively blocking the oil entering the piston working hole 2.1 from the installation groove 3.

[0056] In another implementation of this embodiment, the length of the sleeve 2 is consistent with the length of the cylinder hole 1.1, and the two ends of the sleeve 2 are flush with the two ends of the cylinder hole 1.1. In this way, it can be ensured that the sleeve 2 completely blocks the installation groove 3, and then the sleeve 2 effectively blocks the oil entering the piston working hole 2.1 from the installation groove 3.

[0057] Of course, it should be noted that the two ends of the pipe sleeve 2 may not be flush with the two ends of the cylinder hole 1.1. For example, one end of the pipe sleeve 2 extends to the outside of the first end of the cylinder hole 1.1, or one end of the pipe sleeve 2 is located on the inside of the first end of the cylinder hole 1.1; the other end of the pipe sleeve 2 extends to the outside of the second end of the cylinder hole 1.1, or the other end of the pipe sleeve 2 is located on the inside of the second end of the cylinder hole 1.1.

[0058] In this embodiment, the length of the tube sleeve 2 is 20-60 mm, the outer diameter of the tube sleeve 2 is φ15-40 mm, the inner diameter of the tube sleeve 2 is φ5-35 mm, and the wall thickness of the tube sleeve 2 is 0.5-10 mm.

[0059] Specific embodiment 4, as Figure 5 , Figure 6 As shown, a partition-type oil separation crankcase for a refrigeration compressor includes a cylinder head 1 and a pipe sleeve 2. A cylinder hole 1.1 and a mounting groove 3 are provided on the cylinder head 1. The mounting groove 3 is located above the cylinder hole 1.1 and is connected to the cylinder hole 1.1. In this embodiment, the axis of the cylinder hole 1.1 is horizontally distributed. The pipe sleeve 2 is embedded in the cylinder hole 1.1. The inner hole of the pipe sleeve 2 constitutes a piston working hole 2.1 that cooperates with the piston. The inner wall surface of the piston working hole 2.1 is the friction working surface of the piston. The pipe sleeve 2 blocks the mounting groove 3, thereby blocking the oil that enters the piston working hole 2.1 from the mounting groove 3.

[0060] In this embodiment, an annular protrusion 2.2 is provided in the middle of the outer side surface of the pipe sleeve 2. The pipe sleeve 2 is tightly fitted with the inner side surface of the cylinder hole 1.1 through the annular protrusion 2.2, and the annular protrusion 2.2 and the mounting groove 3 are staggered in the axial direction of the cylinder hole 1.1. The annular protrusion 2.2 and the pipe sleeve 2 are an integrally formed structure. After the pipe sleeve 2 of this solution is assembled into the cylinder hole 1.1 of the cylinder head 1, the pipe sleeve 2 and the cylinder hole 1.1 are matched through the annular protrusion 2.2 in the middle of the pipe sleeve 2, which is conducive to reducing the difficulty of assembly.

[0061] Compared with the prior art that uses the inner side surface of the cylinder hole 1.1 as the piston friction working surface, there is a problem that the setting of the U-shaped groove structure not only affects the machining cylindricity accuracy of the piston friction working surface that cooperates with the piston; and the oil will enter the piston friction working surface through the U-shaped groove, enter the cylinder with the reciprocating motion of the piston, and enter the refrigerator refrigeration system to participate in the external circulation, resulting in a decrease in the refrigerator refrigeration efficiency. In this embodiment, the pipe sleeve 2 is embedded in the cylinder hole 1.1 and the mounting groove 3 is blocked, and the inner hole of the pipe sleeve 2 is used as the piston working hole 2.1 that cooperates with the piston, that is, the inner hole surface of the pipe sleeve 2 is used as the piston friction working surface, and the pipe sleeve 2 is made separately from the cylinder head 1. In this way, on the one hand, the pipe sleeve 2 can effectively block the oil entering the piston working hole 2.1 from the mounting groove 3 (that is, the sleeve blocks the oil entering the piston friction working surface from the mounting groove 3), thereby effectively solving the problem in the prior art that the oil enters the piston friction working surface from the U-shaped groove and enters the refrigerator refrigeration system to participate in the external circulation, resulting in a decrease in the refrigerator refrigeration efficiency; on the other hand, during actual assembly, the cylinder assembly (including the crankshaft, connecting rod, piston pin and piston) can be assembled using the mounting groove 3, and then the pipe sleeve 2 can be embedded in the cylinder hole 1.1, so that the assembly of the cylinder assembly will not be affected.

[0062] In addition, since the inner hole of the sleeve 2 is used as the piston working hole 2.1 that cooperates with the piston, and the wall thickness of the sleeve 2 is evenly distributed, the processing of the piston working hole 2.1 can be better controlled, thereby effectively solving the problem of affecting the cylindricity accuracy of the piston friction working surface due to the setting of the U-shaped groove.

[0063] In this embodiment, a grooved oil separation crankcase for a refrigeration compressor further includes a base 4, which is integrally formed with a cylinder head 1. The mounting groove 3 is connected to the first end of the cylinder hole 1.1, and the first end of the cylinder hole 1.1 faces the base 4. The pipe sleeve 2 is completed by stamping or machining. The mounting groove is U-shaped. Of course, it should be noted that the mounting groove can also be rectangular or other shapes.

[0064] In one implementation of this embodiment, one end of the sleeve 2 is flush with the first end of the cylinder hole 1.1, so that the sleeve 2 can completely block the installation groove 3, thereby effectively blocking the oil entering the piston working hole 2.1 from the installation groove 3.

[0065] In another implementation of this embodiment, the length of the sleeve 2 is consistent with the length of the cylinder hole 1.1, and the two ends of the sleeve 2 are flush with the two ends of the cylinder hole 1.1. In this way, it can be ensured that the sleeve 2 completely blocks the installation groove 3, and then the sleeve 2 effectively blocks the oil entering the piston working hole 2.1 from the installation groove 3.

[0066] Of course, it should be noted that the two ends of the pipe sleeve 2 may not be flush with the two ends of the cylinder hole 1.1. For example, one end of the pipe sleeve 2 extends to the outside of the first end of the cylinder hole 1.1, or one end of the pipe sleeve 2 is located on the inside of the first end of the cylinder hole 1.1; the other end of the pipe sleeve 2 extends to the outside of the second end of the cylinder hole 1.1, or the other end of the pipe sleeve 2 is located on the inside of the second end of the cylinder hole 1.1.

[0067] In this embodiment, the length of the tube sleeve 2 is 20-60 mm, the outer diameter of the tube sleeve 2 is φ15-40 mm, the inner diameter of the tube sleeve 2 is φ5-35 mm, and the wall thickness of the tube sleeve 2 is 0.5-10 mm.

[0068] Specific embodiment 5: The rest of the structure of this embodiment refers to specific embodiment 1 or specific embodiment 2 or specific embodiment 3 or specific embodiment 4, and the difference is that: like Figure 7 , Figure 8 As shown, one end of the pipe sleeve 2 is provided with a mounting ear 2.3 extending outward, and the mounting ear 2.3 is connected to the cylinder head 1 through a connecting piece. The number of the mounting ears 2.3 is one or more, and the number of the mounting ears 2.3 can be set according to the size of the crankcase model. In this embodiment, the number of the mounting ears 2.3 is two, and the two mounting ears 2.3 are symmetrically distributed.

[0069] In one implementation of this embodiment, the connecting member is a screw, a through hole is provided on the mounting ear 2.3, a screw hole is provided on the cylinder head 1, and the screw passes through the through hole on the mounting ear 2.3 and is threadedly connected with the screw hole, thereby fixing the mounting ear 2.3 to the cylinder head 1. In this way, the installation reliability and stability of the pipe sleeve 2 can be improved.

[0070] In another implementation of this embodiment, the connecting member is a pin, a through hole is provided on the mounting ear 2.3, a pin hole is provided on the cylinder head 1, the pin passes through the through hole on the mounting ear 2.3 and is connected with the pin hole by interference fit, and the pin and the through hole are connected by interference fit or clearance fit, so as to fix the mounting ear 2.3 to the cylinder head 1. In this way, the installation reliability and stability of the pipe sleeve 2 can be improved.

[0071] Specific embodiment 6: The rest of the structure of this embodiment refers to specific embodiment 1 or specific embodiment 2 or specific embodiment 3 or specific embodiment 4, and the difference is that: like Fig. 9 , Fig.10As shown, the cylinder head 1 is provided with an upper through hole 1.2 which is connected to the upper part of the inner side surface of the cylinder hole 1.1. The upper through hole 1.2 is located above the cylinder hole 1.1 and extends radially of the cylinder hole 1.1. The outer side of the pipe sleeve 2 is provided with a pipe sleeve hole 2.4 which extends radially of the pipe sleeve 2 and is a blind hole. There is one upper through hole 1.2 or multiple upper through holes 1.2 which are arranged side by side. The number of upper through holes 1.2 can be set according to the size of the crankcase model. The pipe sleeve hole 2.4 corresponds to the upper through hole 1.2 one by one. The upper through hole 1.2 is connected to the pipe sleeve hole 2.4 by a connector.

[0072] In one implementation of this embodiment, the connecting member is a screw, the sleeve hole 2.4 is a threaded hole, and the screw passes through the upper through hole 1.2 and is threadedly connected to the sleeve hole 2.4, thereby fixing the mounting ear 2.3 to the cylinder head 1. In this way, the installation reliability and stability of the sleeve 2 can be improved.

[0073] In another implementation of this embodiment, the connecting member is a pin. The pin passes through the corresponding upper through hole 1.2 and the sleeve hole 2.4, and the pin is connected to the sleeve hole 2.4 by interference fit, and the pin is connected to the upper through hole 1.2 by interference fit or clearance fit, so as to fix the mounting ear 2.3 to the cylinder head 1. In this way, the installation reliability and stability of the sleeve 2 can be improved.

[0074] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A grooved oil separation crankcase for a refrigeration compressor, comprising a cylinder head, on which a cylinder hole and a mounting groove are provided, wherein the mounting groove is located above the cylinder hole and communicates with the cylinder hole, wherein the mounting groove is characterized in that: It also includes a pipe sleeve, which is embedded in the cylinder hole. The inner hole of the pipe sleeve constitutes a piston working hole matched with the piston. The pipe sleeve blocks the installation groove, thereby blocking the oil entering the piston working hole from the installation groove.

2. The grooved oil separation crankcase for a refrigeration compressor according to claim 1, characterized in that: The outer diameters of various parts of the outer side surface of the pipe sleeve are the same, and the outer side surface of the pipe sleeve is tightly fitted with the inner side surface of the cylinder hole.

3. The grooved oil separation crankcase for a refrigeration compressor according to claim 1, characterized in that: The outer side surface of the pipe sleeve is provided with two annular protrusions, which are close to or located at the two ends of the pipe sleeve. The pipe sleeve is tightly fitted with the inner side surface of the cylinder hole through the annular protrusions.

4. The grooved oil separation crankcase for a refrigeration compressor according to claim 1, characterized in that: An annular protrusion is provided in the middle of the outer side surface of the pipe sleeve, and the pipe sleeve is tightly fitted with the inner side surface of the cylinder hole through the annular protrusion, and the annular protrusion and the mounting groove are staggered in the axial direction of the cylinder hole.

5. The grooved oil separation crankcase for a refrigeration compressor according to claim 1, characterized in that: One end of the pipe sleeve is provided with a mounting ear extending outward, and the mounting ear is connected to the cylinder head through a connecting piece, and the connecting piece is a screw or a pin connection.

6. The grooved oil separation crankcase for a refrigeration compressor according to claim 1, characterized in that: The cylinder head is provided with an upper through hole communicating with the upper part of the inner side surface of the cylinder hole, and the outer side surface of the pipe sleeve is provided with a pipe sleeve hole. The upper through hole and the pipe sleeve hole are connected by a connecting piece, and the connecting piece is a screw or a pin connection.

7. A grooved oil separation crankcase for a refrigeration compressor according to any one of claims 1 to 6, characterized in that: The mounting groove is communicated with the first end of the cylinder hole, and one end of the pipe sleeve is flush with the first end of the cylinder hole.

8. A grooved oil separation crankcase for a refrigeration compressor according to any one of claims 1 to 6, characterized in that: The length of the pipe sleeve is consistent with the length of the cylinder hole, and the two ends of the pipe sleeve are flush with the two ends of the cylinder hole.

9. A grooved oil separation crankcase for a refrigeration compressor according to any one of claims 1 to 6, characterized in that: The length of the tube sleeve is 20-60 mm, the outer diameter of the tube sleeve is φ15-40 mm, and the inner diameter of the tube sleeve is φ5-35 mm.

10. A grooved oil separation crankcase for a refrigeration compressor according to any one of claims 1 to 6, characterized in that: The wall thickness of the pipe sleeve is 0.5-10 mm.

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