Cylinder connecting structure of refrigeration linear compressor

Abstract

The utility model relates to the technical field of compressor cylinder connecting structure design, in particular to a cylinder connecting structure of a refrigeration linear compressor. The compressor cylinder connecting structure comprises a compressor cylinder and a cylinder support; small clearance fit is adopted between the compressor air cylinder and the air cylinder support, then bolt fixing is adopted, compared with interference fit, the structural stability is enhanced, sliding cannot be generated in the machining and using process, and the situation that an inner hole of the air cylinder support extrudes the air cylinder due to thermal deformation, and an air cylinder hole deforms is avoided; meanwhile, due to no extrusion supported by the air cylinder, the air cylinder can be independently processed without secondary processing after assembly, so that the process difficulty is reduced; an oil way is redesigned, so that part of lubricating oil leaked from a gap in clearance fit accounts for a low proportion of the whole lubricating oil quantity, and the whole lubricating system cannot be influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of compressor cylinder connection structure design, in particular to a refrigeration linear compressor cylinder connection structure. Background Art

[0002] Unlike traditional reciprocating piston compressors, linear compressors can effectively reduce mechanical losses and have higher theoretical efficiency due to fewer friction pairs. Different material structures determine the shape of the cylinder. Aluminum alloy cylinders and cylinder supports have relatively high technical requirements and are difficult to process. Cast iron cylinders, like most reciprocating piston compressors, are simple and reliable to process. In order to facilitate processing, the cylinder and the support are often separated, with the cylinder support on the outside and the cylinder on the inside. Prior art CN101835983B provides a linear compressor, which includes: a cylinder having a refrigerant compression space; a piston that performs linear reciprocating motion axially inside the cylinder to compress the refrigerant; and a frame having a mounting hole so that one end of the cylinder can be mounted on the frame, and a portion around the mounting hole that contacts this end of the cylinder also has a deformation prevention portion. Prior art uses an interference fit method to assemble the cylinder and the frame. After assembly, the cylinder will have a certain deformation, and a secondary honing process is required to make the internal dimensions of the cylinder meet the use requirements. The frame does not require any connecting accessories and is in circular contact, but the frame also has the problem of interference setting. Honing is a rotary processing process, and the cylinder will be subjected to the rotary torque from the honing tool. Too small interference can easily cause the components to loosen during secondary processing, and the cylinder piston will rotate relative to each other, resulting in processing failure; although too large interference can meet the requirements of secondary processing, when the cylinder and the frame are made of different materials, different thermal deformations will occur during operation, and the cylinder end face will be tightly wrapped by the frame. The cylinder will become smaller and the piston will be stuck. Utility Model Content

[0003] In order to solve the problems in the prior art, the utility model provides a refrigeration linear compressor cylinder connection structure, the compressor cylinder connection structure includes a compressor cylinder and a cylinder support; the compressor cylinder is provided with a cylinder end face, the cylinder end face is in contact with the cylinder support, and the cylinder end face is provided with a plurality of first fixing holes; the cylinder support is provided with a cylinder mounting hole, the cylinder mounting hole is provided with a cylinder support end face, the cylinder support end face is in contact with the cylinder end face, the cylinder support end face is provided with a second fixing hole, and the second fixing hole matches the first fixing hole. The cylinder and the cylinder support of the linear compressor are changed from interference fit to small clearance fit plus bolt fixation, which ensures the processing accuracy while avoiding the thermal deformation of the cylinder support affecting the deformation of the cylinder. The cylinder can be honed after assembly or honed first and then assembled with the cylinder support, which improves the processing and assembly reliability of the cylinder and facilitates the rework of the cylinder.

[0004] Preferably, the compressor cylinder is a multi-section cylindrical structure, comprising a narrow outer circular section and a wide outer circular section adjacent to the narrow outer circular section, the narrow outer circular section and the wide outer circular section adopt a step transition, and the step surface of the step transition is the cylinder end face.

[0005] Preferably, the outer diameter of the wide portion outer circular segment is smaller than the inner diameter of the cylinder mounting hole, the outer wall of the wide portion outer circular segment and the inner wall of the cylinder mounting hole form a first annular oil groove, a transverse oil guide hole is provided in the wall of the compressor cylinder along the axial direction of the compressor cylinder, and a vertical oil guide hole is provided in the wide portion outer circular segment in the wall of the compressor cylinder, and the transverse oil guide hole connects the vertical oil guide hole and the first annular oil groove.

[0006] Preferably, the compressor cylinder is provided with an axial cylinder hole, a second annular oil groove is provided in the cylinder hole, and the second annular oil groove is connected to the transverse oil guide hole.

[0007] Preferably, the cylinder support is provided with an oil inlet hole and an oil outlet hole, and the oil inlet hole and the oil outlet hole are connected to the first annular oil groove.

[0008] Preferably, the compressor cylinder connection structure includes a cylinder end cover whose inner side is one end of the cylinder hole, the cylinder end cover is provided with an oil drain hole, an oil baffle cover is fixed to the outer side of the cylinder end cover, one end of the oil drain hole is communicated with the first annular oil groove, and the other end is communicated with the interior of the oil baffle cover.

[0009] Preferably, the wide outer circular section of the compressor cylinder is in contact with the cylinder end cover, and the contact surface between the compressor cylinder and the cylinder end cover is an exhaust sealing surface, and the exhaust sealing surface is provided with an annular sealing groove.

[0010] Preferably, one end of the transverse oil guide hole of the compressor cylinder is connected to the second annular oil groove, and the other end is the exhaust sealing surface. An oil hole plug is provided at one end of the transverse oil guide hole close to the exhaust sealing surface, and the oil hole plug is located in the annular sealing groove ring.

[0011] The utility model solves the problems of the prior art through the above-mentioned arrangement and has the following beneficial effects: a small clearance is adopted between the compressor cylinder and the cylinder support, which are then fixed with bolts, thereby enhancing the structural stability compared with the interference fit, and no sliding will occur during processing and use, and the inner hole of the cylinder support will not squeeze the cylinder due to thermal deformation, causing deformation of the cylinder hole; at the same time, since there is no squeezing of the cylinder support, the cylinder can be processed separately and no secondary processing is required after assembly, thereby reducing the difficulty of the process; the oil circuit is redesigned, so that the part of the lubricating oil leaking from the gap of the clearance fit accounts for a lower proportion of the total amount of lubricating oil, and will not affect the entire lubrication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of the utility model;

[0013] Figure 2 It is an exploded view of the utility model.

[0014] Legend: linear oil pump 1; cylinder support 2; cylinder mounting hole 201; cylinder support end face 202; second fixing hole 203; cylinder support outer wall 204; oil inlet hole 205; oil outlet hole 206; sealing ring 3; compressor cylinder 4; narrow outer circular section 401; wide outer circular section 402; small diameter section 403; cylinder end face 404; first fixing hole 405; cylinder hole 406; sealing groove 407; exhaust sealing surface 408; transverse oil guide hole 409; vertical oil guide hole 410; second annular oil groove 411; first annular oil groove 412; fixing bolt 5; oil hole plug 6; cylinder end cover 7; oil drain hole 701; oil shield cover 702. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the embodiments of the present utility model clearer, the technical scheme in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0016] Example 1

[0017] Combination Figure 1 and Figure 2As shown, this embodiment provides a refrigeration linear compressor cylinder connection structure, the compressor cylinder connection structure includes a compressor cylinder 4 and a cylinder support 2; the compressor cylinder 4 is a multi-section cylindrical structure, the compressor cylinder 4 includes a narrow outer circular section 401, a wide outer circular section 402 adjacent to the narrow outer circular section 401, and a small diameter section 403, the narrow outer circular section 401 and the wide outer circular section 402 adopt a step transition, and the step surface of the step transition is the cylinder end face 404; the compressor cylinder 4 is provided with a cylinder end face 404, the cylinder end face 404 is in contact with the cylinder support 2, and the cylinder end face 404 is provided with two symmetrical first fixing holes 405, and the first fixing holes 405 are bolt holes; the cylinder support 2 is provided with a cylinder mounting hole 201, and the cylinder mounting hole 201 is provided with a gas The cylinder support end face 202 contacts the cylinder end face 404, and the cylinder support end face 202 is provided with two symmetrical second fixing holes 203, and the second fixing holes 203 match the first fixing holes 405, and the second fixing holes 203 are countersunk holes; the outer diameter of the wide portion outer circular section 402 is smaller than the inner diameter of the cylinder mounting hole 201, and the outer wall of the wide portion outer circular section 402 and the inner wall of the cylinder mounting hole 201 form a first annular oil groove 412, and a transverse oil guide hole 409 is provided in the wall of the compressor cylinder 4 along the axial direction of the compressor cylinder 4, and the wide portion outer circular section 402 in the wall of the compressor cylinder 4 is provided with a vertical oil guide hole 410, and the transverse oil guide hole 409 connects the vertical oil guide hole 410 with the first annular oil groove 412.

[0018] Through the above-mentioned arrangement, by setting the outer diameter of the wide outer circular section 402 to be smaller than the inner diameter of the cylinder mounting hole 201, the outer wall of the wide outer circular section 402 and the inner wall of the cylinder mounting hole 201 form a first annular oil groove 412, and the cylinder and the cylinder support 2 of the linear compressor are changed from an interference fit to a small clearance fit; a first fixing hole 405 is set on the cylinder end face 404, which cooperates with the second fixing hole 203 on the cylinder support 2, and the cylinder and the cylinder support 2 are fixed by fixing bolts 5. The contact surface between the cylinder end face 404 and the cylinder support 2 is precisely processed to ensure a close fit between the two and enhance the stability of the connection; while ensuring the processing accuracy, it also avoids the thermal deformation of the cylinder support 2 affecting the deformation of the cylinder; the cylinder can be honed after assembly or honed first and then assembled with the cylinder support 2, which improves the processing and assembly reliability of the cylinder and facilitates the rework of the cylinder. A transverse oil guide hole 409 and a vertical oil guide hole 410 are designed in the wall of the compressor cylinder 4, which are connected to the first annular oil groove 412, thereby optimizing the flow path of the lubricating oil and significantly improving the lubrication effect. This design not only extends the service life of the components, but also helps to reduce maintenance costs.

[0019] like Figure 1As shown, a linear oil pump 1 is provided below the compressor, a transverse oil guide hole 409 is provided in the wall of the compressor cylinder 4 along the axial direction of the compressor cylinder 4, a vertical oil guide hole 410 is provided in the wide outer circular section 402 in the wall of the compressor cylinder 4, the transverse oil guide hole 409 connects the vertical oil guide hole 410 with the first annular oil groove 412, the compressor cylinder 4 is provided with an axial cylinder hole 406, a second annular oil groove 411 is provided in the cylinder hole 406, and the second annular oil groove 411 is connected with the transverse oil guide hole 409; an oil circuit is provided inside the cylinder support 2, the oil circuit has two through holes leading to the outer wall of the cylinder support 2, and there are two through holes leading to the cylinder mounting hole 201, and the through holes leading to the outer wall of the cylinder support 2 are divided into An oil inlet hole 205 and an oil outlet hole 206, the oil inlet hole 205 and the oil outlet hole 206 are connected to the first annular oil groove 412; the compressor cylinder 4 connection structure includes a cylinder end cover 7 whose inner side is one end of the cylinder hole 406, the cylinder end cover 7 is provided with an oil drain hole 701, an oil retaining cover 702 is fixed to the outer side of the cylinder end cover 7, one end of the oil drain hole 701 is connected to the first annular oil groove 412, and the other end is connected to the interior of the oil retaining cover 702; one end of the transverse oil guide hole 409 of the compressor cylinder 4 is connected to the second annular oil groove 411, and the other end is the exhaust sealing surface 408, and an oil hole plug 6 is provided at one end of the transverse oil guide hole 409 close to the exhaust sealing surface 408, and the oil hole plug 6 is located within the annular sealing groove 407 circle.

[0020] During the operation of the refrigeration compressor, the linear motor will vibrate the movement, and the cylinder and cylinder support 2 will transmit the vibration to the linear oil pump 1. The vibration of the oil pump will build up oil pressure. In this process, the oil in the compressor housing is transported to the oil inlet hole 205 through the linear oil pump 1. Through the oil inlet hole 205, the lubricating oil enters the first annular oil groove 412 between the cylinder support 2 and the cylinder. Under the action of the oil pressure generated by the oil pump, a part of the lubricating oil enters the second annular oil groove 411 through the oil path formed by the vertical oil guide hole 410 and the transverse oil guide hole 409. The second annular oil groove 411 is filled with lubricating oil, which lubricates the cylinder and the piston and takes away part of the heat during the reciprocating motion of the piston; the lubricating oil reaches the top of the cylinder along the oil path formed by the vertical oil guide hole 410 and the transverse oil guide hole 409, and another part of the lubricating oil flows to the top of the cylinder along the first annular oil groove 412, where the oil paths meet. The oil circuit after the junction is divided into parts. One part of the lubricating oil is discharged into the oil baffle cover 702 along the oil discharge hole 701 of the cylinder end cover 7 corresponding to the oil circuit under the action of oil pressure. Under the obstruction of the oil baffle cover 702, the lubricating oil forms an oil film on the outer side of the cylinder end cover 7, and flows along the channels on both sides of the oil baffle cover 702, and finally flows to the bottom of the compressor shell; the other part of the lubricating oil enters the oil discharge channel through the oil outlet hole 206 of the cylinder support 2, and returns to the bottom of the compressor shell through other paths.

[0021] like Figure 1 As shown, the wide outer circular section 402 of the compressor cylinder 4 is in contact with the cylinder end cover 7 , and the contact surface between the compressor cylinder 4 and the cylinder end cover 7 is an exhaust sealing surface 408 , and the exhaust sealing surface 408 is provided with an annular sealing groove 407 .

[0022] Through the above-mentioned arrangement, since a small clearance is adopted between the cylinder and the cylinder support 2, a first annular oil groove 412 is formed, and the oil circuit is redesigned to cooperate with the first annular oil groove 412, so that a portion of the lubricating oil leaking from the gap of the clearance fit accounts for a relatively low proportion of the total amount of lubricating oil, and will not affect the entire lubrication system. At the same time, the lubricating oil can flow through the compressor cylinder 4, cylinder piston and other components again to take away the working heat and provide a lubrication effect; the oil hole plug 6 ensures that the lubricating oil will not enter the cylinder end cover 7 through the oil guide hole.

[0023] Example 2

[0024] In order to ensure the processing accuracy while avoiding the influence of thermal deformation of cylinder support 2 on cylinder deformation, the cylinder can be honed after assembly or honed first and then assembled with cylinder support 2, so as to improve the processing and assembly reliability of the cylinder and facilitate the rework of the cylinder. The present embodiment provides a connection structure of cylinder 4 of a refrigeration linear compressor, including a cylinder support 2 and a cylinder. The cylinder support 2 is provided with a cylinder mounting hole 201 and an anti-collision angle, and a step surface is provided inside the cylinder mounting hole 201, and the step surface is the surface of the cylinder support 2. Two symmetrical countersunk holes are provided on the back side of the surface of the cylinder support 2, and an annular oil circuit is provided inside the cylinder support 2. The cylinder support 2 is provided with an oil circuit inside, and there are two through holes in the oil circuit leading to the outer wall of the cylinder support 2, and there are two through holes leading to the cylinder mounting hole 201. The through holes of the oil circuit leading to the outer wall of the cylinder support 2 are divided into oil inlet holes 20. 5 and oil outlet hole 206; the cylinder is a T-shaped cylindrical structure, and its outer diameter is composed of a narrow outer circle, a wide outer circle and a small diameter section 403. A cylinder hole 406 is provided in the middle of the cylinder, and a cylinder end face 404 is provided between the narrow outer circle and the wide outer circle, and a threaded hole is provided on the cylinder end face 404; the cylinder end face 404 is against the step surface inside the cylinder mounting hole 201 of the cylinder support 2, and the narrow outer circle of the cylinder and the through hole of the cylinder support 2 form a small gap fit to facilitate assembly and ensure the position well. The threaded hole on the cylinder end face 404 is aligned with the countersunk hole of the cylinder support 2, and a fixing bolt 5 is provided in the countersunk hole. The fixing bolt 5 is tightly connected with the cylinder threaded hole.

[0025] An annular sealing groove 407 is provided on the exhaust sealing surface 408 of the cylinder, a sealing ring 3 is provided in the annular sealing groove 407, and a transverse oil guide hole 409 is provided inside the annular sealing groove 407 to have an outlet at the exhaust sealing surface 408; an oil hole plug 6 is provided at a position of the transverse oil guide hole 409 close to the exhaust sealing surface 408, and the oil hole plug 6 ensures that the lubricating oil does not enter the exhaust cover through the oil guide hole; a transverse oil guide hole 409 and a vertical oil guide hole 410 are provided on the inner wall of the cylinder, and the vertical oil guide hole 410 is arranged on the outer circumferential surface of the wide part of the cylinder, and the vertical oil guide hole 410 is communicated with the transverse oil guide hole 409, and a second annular oil groove 411 is provided inside the cylinder hole 406, and the transverse oil guide hole 409 is communicated with the second annular oil groove 411.

[0026] Compared with the prior art, the utility model adopts bolt fixing and clearance fit between the cylinder and the cylinder support 2, which enhances the structural stability compared with the interference fit, and will not cause sliding during processing and use. The inner hole of the cylinder support 2 will not squeeze the cylinder due to thermal deformation, causing deformation of the cylinder hole 406. At the same time, since there is no squeezing of the cylinder support 2, the cylinder can be processed separately and no secondary processing is required after assembly, reducing the process difficulty.

[0027] The cylinder end face 404 of the cylinder is against the cylinder support 2 surface of the cylinder support 2, and the outer circle of the narrow part of the cylinder and the cylinder mounting hole 201 of the cylinder support 2 form a small gap fit to facilitate assembly and ensure the position well. The cylinder threaded hole and the countersunk hole are aligned, and a fixing bolt 5 is provided in the countersunk hole. The bolt is tightly connected with the cylinder threaded hole. The outer circle of the wide part of the cylinder and the outer avoidance surface of the cylinder support 2 form a first annular oil groove 412, and an oil hole plug 6 is provided at the position of the oil guide hole of the cylinder near the exhaust sealing surface 408, and the oil hole plug 6 ensures that the lubricating oil will not enter the cylinder end cover 7 through the oil guide hole.

[0028] During the operation of the refrigeration compressor, the linear motor will vibrate the movement, and the cylinder and cylinder support 2 will transmit the vibration to the linear oil pump 1. The vibration of the oil pump will build up oil pressure. This process is an essential part of the operation of the compressor to ensure the circulation of the lubricating oil and the full lubrication of the cylinder. In this process, as the oil pressure increases, the lubricating oil in the compressor housing is effectively extracted and transported to the oil inlet hole 205 through the linear oil pump 1. After passing through the oil inlet hole 205, the lubricating oil enters the first annular oil groove 412 between the cylinder support 2 and the cylinder. Under the action of the oil pressure generated by the oil pump, a part of the lubricating oil enters the second annular oil groove 411 through the oil path formed by the vertical oil guide hole 410 and the transverse oil guide hole 409. The second annular oil groove 411 is filled with lubricating oil, and the cylinder and the piston are lubricated at the same time during the reciprocating motion of the piston, ensuring that the inner wall of the cylinder is evenly coated during the movement of the cylinder and taking away part of the heat, thereby effectively maintaining the temperature of the cylinder stable; the lubricating oil reaches the top of the cylinder along the oil path formed by the vertical oil guide hole 410 and the transverse oil guide hole 409, and at the same time, another part of the lubricating oil flows to the top of the cylinder along the first annular oil groove 412, and the oil paths meet here. The oil circuit after the junction is divided into parts. A part of the lubricating oil is discharged into the oil baffle cover 702 along the oil discharge hole 701 of the cylinder end cover 7 corresponding to the oil circuit under the action of oil pressure. Under the obstruction of the oil baffle cover 702, the lubricating oil forms an oil film on the outside of the cylinder end cover 7. The oil film enhances the sealing of the cylinder, reduces heat loss, and improves the efficiency of the compressor. It also flows along the channels on both sides of the oil baffle cover 702 and finally flows to the bottom of the compressor casing; the other part of the lubricating oil enters the oil discharge channel through the oil outlet hole 206 of the cylinder support 2, and returns to the bottom of the compressor casing through other paths.

[0029] The utility model solves the problems of the prior art through the above-mentioned arrangement and has the following beneficial effects: a small clearance is adopted between the compressor cylinder 4 and the cylinder support 2, which are then fixed with bolts. Compared with the interference fit, the structural stability is enhanced, and no sliding will occur during processing and use. The inner hole of the cylinder support 2 will not squeeze the cylinder due to thermal deformation, causing deformation of the cylinder hole 406. At the same time, since there is no squeezing of the cylinder support 2, the cylinder can be processed separately and no secondary processing is required after assembly, thereby reducing the difficulty of the process. The oil circuit is redesigned so that the part of the lubricating oil leaking from the gap of the clearance fit accounts for a lower proportion of the total amount of lubricating oil, which will not affect the entire lubrication system.

[0030] The specific embodiments described herein are merely examples of the spirit of the present invention. A person skilled in the art of the present invention may make various modifications or additions to the specific embodiments described or replace them in a similar manner, but this will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A refrigeration linear compressor cylinder connection structure, characterized in that: The compressor cylinder connection structure includes a compressor cylinder and a cylinder support; The compressor cylinder is provided with a cylinder end surface, the cylinder end surface is in contact with the cylinder support, and a plurality of first fixing holes are provided on the cylinder end surface; The cylinder support is provided with a cylinder mounting hole, the cylinder mounting hole is provided with a cylinder support end face, the cylinder support end face is in contact with the cylinder end face, the cylinder support end face is provided with a second fixing hole, and the second fixing hole matches the first fixing hole.

2. A refrigeration linear compressor cylinder connection structure according to claim 1, characterized in that: The compressor cylinder is a multi-section cylindrical structure, comprising a narrow outer circular section and a wide outer circular section adjacent to the narrow outer circular section. The narrow outer circular section and the wide outer circular section adopt a step transition, and the step surface of the step transition is the cylinder end face.

3. A refrigeration linear compressor cylinder connection structure according to claim 2, characterized in that: The outer diameter of the wide portion outer circular segment is smaller than the inner diameter of the cylinder mounting hole, the outer wall of the wide portion outer circular segment and the inner wall of the cylinder mounting hole form a first annular oil groove, a transverse oil guide hole is provided in the wall of the compressor cylinder along the axial direction of the compressor cylinder, and a vertical oil guide hole is provided in the wide portion outer circular segment in the wall of the compressor cylinder, and the transverse oil guide hole connects the vertical oil guide hole and the first annular oil groove.

4. A refrigeration linear compressor cylinder connection structure according to claim 3, characterized in that: The compressor cylinder is provided with an axial cylinder hole, a second annular oil groove is provided in the cylinder hole, and the second annular oil groove is connected to the transverse oil guide hole.

5. A refrigeration linear compressor cylinder connection structure according to claim 3 or 4, characterized in that: The cylinder support is provided with an oil inlet hole and an oil outlet hole, and the oil inlet hole and the oil outlet hole are connected to the first annular oil groove.

6. The refrigeration linear compressor cylinder connection structure according to claim 4 is characterized in that: The compressor cylinder connection structure includes a cylinder end cover whose inner side is one end of the cylinder hole, the cylinder end cover is provided with an oil drain hole, an oil baffle cover is fixed to the outer side of the cylinder end cover, one end of the oil drain hole is communicated with the first annular oil groove, and the other end is communicated with the interior of the oil baffle cover.

7. A refrigeration linear compressor cylinder connection structure according to claim 6, characterized in that: The wide outer circular section of the compressor cylinder is in contact with the cylinder end cover, and the contact surface between the compressor cylinder and the cylinder end cover is an exhaust sealing surface, and the exhaust sealing surface is provided with an annular sealing groove.

8. The refrigeration linear compressor cylinder connection structure according to claim 7 is characterized in that: One end of the transverse oil guide hole of the compressor cylinder is connected to the second annular oil groove, and the other end is an exhaust sealing surface. An oil hole plug is provided at one end of the transverse oil guide hole close to the exhaust sealing surface, and the oil hole plug is located in the annular sealing groove ring.

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