Piston connecting rod arrangement and compressor

Abstract

The application discloses a piston connecting rod device and a compressor, wherein the piston connecting rod device comprises a piston, a connecting rod and a piston pin assembly, the piston is provided with a piston pin hole, and the connecting rod is provided with a mounting hole; the piston pin assembly comprises a piston pin body and a fixing block, the length of the piston pin body is smaller than the length of the piston pin hole, the outer diameter of the piston pin body is smaller than the inner diameter of the piston pin hole, the piston pin body is inserted into the mounting hole through the piston pin hole, and the fixing block is arranged in the piston pin hole and cooperates with the other fixing block or the inner wall of the piston pin hole to limit the piston pin body at both ends of the piston pin hole. The piston connecting rod device can reduce the probability that the piston pin assembly cannot be assembled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to a piston connecting rod device and a compressor. BACKGROUND

[0002] In a fully enclosed piston compressor, a motor drives a crankshaft to rotate, and a connecting rod connected with the crankshaft connects a piston through a piston pin to make the piston reciprocate in a cylinder, thereby completing the working process of compression and exhaust. In actual assembly, it is usually required that the piston pin and the connecting rod have a high perpendicularity, and in an ideal state, the piston pin and the connecting rod are usually required to be vertically arranged. In the related art, the piston pin is in a strip shape, the length of the piston pin matches the length of a piston pin hole, the outer diameter of the piston pin matches the inner diameter of the piston pin hole, and the center line of the piston pin installed in the piston pin hole is basically parallel to the center line of the piston pin hole. However, in actual assembly, due to the existence of part processing errors and part assembly errors, the perpendicularity between the connecting rod and the center line of the piston pin hole is often poor, which easily leads to the situation that the strip-shaped piston pin cannot be assembled. SUMMARY

[0003] The main purpose of the present application is to provide a piston connecting rod device, which aims to reduce the probability that the piston pin cannot be assembled.

[0004] To achieve the above-mentioned purpose, the piston connecting rod device provided by the present application comprises:

[0005] a piston having a piston pin hole;

[0006] a connecting rod having a mounting hole; and

[0007] a piston pin assembly comprising a piston pin body and a fixing block, the length of the piston pin body is less than the length of the piston pin hole, the outer diameter of the piston pin body is less than the inner diameter of the piston pin hole, the piston pin body is inserted into the mounting hole through the piston pin hole, and the fixing block is arranged in the piston pin hole and cooperates with another fixing block or the inner wall of the piston pin hole to limit the piston pin body at both ends of the piston pin hole.

[0008] In an embodiment, the length of the piston pin body is greater than the length of the mounting hole.

[0009] In an embodiment, the length of the piston pin body is 1.1-1.3 times the length of the mounting hole.

[0010] In an embodiment, the outer diameter of the piston pin body matches the inner diameter of the mounting hole, and the piston pin body and the mounting hole are gap-fitted.

[0011] In an embodiment, the length of the piston pin body is 0.3-0.8 times the length of the piston pin hole.

[0012] In an embodiment, the outer diameter of the fixed block matches the inner diameter of the piston pin hole, and the fixed block is clearance fit with the piston pin hole.

[0013] In an embodiment, the outer diameter of the piston pin body is less than or equal to the outer diameter of the fixed block.

[0014] In an embodiment, the end of the piston pin body is clearance fit with the inner wall of the fixed block or the piston pin hole; and / or

[0015] The piston pin assembly further comprises a fixing member connecting the fixed block and the piston.

[0016] In an embodiment, one end of the piston pin body has a first outward convex spherical surface, and the other end has a second outward convex spherical surface.

[0017] The fixed block is two, a first fixed block and a second fixed block, the first fixed block has a third inward concave spherical surface, and the second fixed block has a fourth inward concave spherical surface; or the fixed block is one, the fixed block has a third inward concave spherical surface, and the inner wall of the piston pin hole has a fourth inward concave spherical surface.

[0018] The first spherical surface is sliding fit with the third spherical surface, and the second spherical surface is sliding fit with the fourth spherical surface.

[0019] In an embodiment, the first spherical surface can be completely accommodated in the third spherical surface, and the second spherical surface can be completely accommodated in the fourth spherical surface.

[0020] In an embodiment, the first spherical surface and the second spherical surface are symmetrically arranged, and the symmetry axis of the first spherical surface and the second spherical surface is perpendicular to the center line of the piston pin body.

[0021] In an embodiment, the piston pin body has an axial through hole penetrating through the axial direction thereof, and the fixed block has an axial channel penetrating through the axial direction thereof, and the axial channel is in communication with the axial through hole.

[0022] In an embodiment, the inner diameter of the axial channel is greater than the inner diameter of the axial through hole; and / or

[0023] An oil groove extending along the circumferential direction is formed on the outer side wall of the piston pin body, and a through oil hole in communication with the axial through hole is formed on the bottom wall of the oil groove.

[0024] The present application further provides a compressor comprising the piston connecting rod device.

[0025] The piston pin assembly in the piston connecting rod device is split into at least two segments relative to the long strip-shaped piston pin in the related art. That is, the piston pin assembly in the piston connecting rod device is a segmented piston pin relative to the long strip-shaped piston pin in the related art. Therefore, in the piston pin assembly, the length of the piston pin body can be shorter. The outer diameter of the piston pin body is smaller than the inner diameter of the piston pin hole. When the inner diameter of the piston pin hole is unchanged, the shorter the length of the piston pin body is, the greater the maximum angle of the piston pin body tilting relative to the center line of the piston pin hole is. Therefore, in actual assembly, when the perpendicularity between the connecting rod and the center line of the piston pin hole is poor due to errors, that is, when the center line of the mounting hole of the connecting rod tilts at a certain angle relative to the center line of the piston pin hole due to errors, the position of the piston pin body can be adjusted by tilting the piston pin body at a certain angle relative to the center line of the piston pin hole, so that the piston pin body can be inserted into the mounting hole of the connecting rod, and the assembly of the piston pin body and the connecting rod is completed. The assembly of the piston pin assembly and the connecting rod is completed after the assembly of the piston pin body and the connecting rod is completed. Therefore, when the connecting rod and the piston are connected by using the piston pin assembly, the probability of the piston pin assembly failing to be assembled due to errors can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor based on the drawings shown.

[0027] Figure 1 A partial cross-sectional view of a compressor according to an embodiment of the present application;

[0028] Figure 2 A cross-sectional view of a piston connecting rod device according to an embodiment of the present application;

[0029] Figure 3 A perspective view of a piston connecting rod device according to an embodiment of the present application;

[0030] Figure 4 A cross-sectional view of a piston pin body of a piston connecting rod device according to an embodiment of the present application;

[0031] Figure 5 A perspective view of a piston pin body of a piston connecting rod device according to an embodiment of the present application;

[0032] Figure 6 A side view of a piston pin body of a piston connecting rod device according to an embodiment of the present application;

[0033] Figure 7 Fig. 1 is a perspective view of a fixed block of a piston connecting rod device according to an embodiment of the present application;

[0034] Figure 8 Fig. 2 is a sectional view of the fixed block of the piston connecting rod device according to the embodiment of the present application.

[0035] BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Reference Name Reference Name 10 Compressor 200 Crankshaft 300 Cylinder 400 Connecting rod 402 Big end of connecting rod 404 Small end of connecting rod 500 Piston pin assembly 310 Piston 312 Piston pin bore 510 Piston pin body 520 Retainer block 410 Mounting hole 520a First retainer block 520b Second retainer block 512 First spherical surface 514 Second spherical surface 522 Third spherical surface 524 Fourth spherical surface 516 Axial through hole 518 Oil groove 519 Oil passage 526 Axial channel 530 Retainer 528 Retainer hole 314 Disassembly opening 316 Connecting through hole 318 Connecting blind hole

[0037] The object, features and advantages of the present application will be further illustrated by the embodiments, with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0039] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0040] In addition, if the embodiments of the present application involve descriptions of “first”, “second”, etc., the descriptions of “first”, “second”, etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first” and “second” can explicitly or implicitly include at least one of the features. In addition, the meaning of “and / or” appearing throughout the text is that it includes three parallel schemes, for example, “A and / or B” includes A scheme, or B scheme, or A and B schemes are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0041] The present application provides a compressor.

[0042] In the embodiments of the present application, as Figure 1As shown, the compressor 10 includes a crankshaft 200, a cylinder 300, a connecting rod 400, and a piston pin assembly 500. A movable piston 310 is housed within the cylinder 300. One end (large end 402) of the connecting rod 400 is connected to the crankshaft 200, and the other end (small end 404) is connected to the piston 310 via the piston pin assembly 500. When a drive mechanism such as a motor drives the crankshaft 200 to rotate, the crankshaft 200 can drive the piston 310 to reciprocate within the cylinder 300 via the connecting rod 400 and the piston pin assembly 500. The piston 310, connecting rod 400, and piston pin assembly 500 can be used to construct a piston-connecting rod assembly.

[0043] In this embodiment, as Figures 1-3 As shown, piston 310 has a piston pin hole 312. The small end 402 of connecting rod 400 has a mounting hole 410. The end of connecting rod 400 with the mounting hole 410 is located inside piston 310, that is, the end of connecting rod 400 away from crankshaft 200 (small end 404) is located inside piston 310. Specifically, in this embodiment, piston 310 has a disassembly port 314 on the side near connecting rod 400. Disassembly port 314 communicates with piston pin hole 312. Disassembly port 314 is used for the small end 404 of connecting rod 400 to enter and exit piston 310, so that the mounting hole 410 of small end 402 of connecting rod 400 corresponds to the piston pin hole 312. The ideal correspondence between the mounting hole 410 and the piston pin hole 312 is such that the center line of the mounting hole 410 is parallel to or even coincides with the center line of the piston pin hole 312. In this case, it is assumed that the connecting rod 400 and the center line of the piston pin hole 312 have good perpendicularity.

[0044] The piston pin assembly 500 includes a piston pin body 510 and a retaining block 520. The piston pin body 510 is inserted into the mounting hole 410 through the piston pin hole 312. The length of the piston pin body 510 is less than the length of the piston pin hole 312. The outer diameter of the piston pin body 510 is less than the inner diameter of the piston pin hole 312. The retaining block 520 is disposed within the piston pin hole 312 and is used to engage with another retaining block 520 or the inner wall of the piston pin hole 312 to limit the piston pin body 510 at both ends of the piston pin hole 312.

[0045] When the piston pin assembly 500 includes two fixing blocks 520, one fixing block 520 is a first fixing block 520a, and the other fixing block 520 is a second fixing block 520b. The first fixing block 520a and the second fixing block 520b are respectively disposed at both ends of the piston pin hole 312. The first fixing block 520a and the second fixing block 520b cooperate to limit the piston pin body 510 at both ends of the piston pin hole 312. When the piston pin assembly 500 includes one fixing block 520, the fixing block 520 cooperates with the inner wall of the top or bottom of the piston pin hole 312 to limit the piston pin body 510 at both ends of the piston pin hole 312.

[0046] It should be noted that, when the piston pin body 510 is located in the piston pin hole 312, the inner wall of the piston pin hole 312 and / or the inner wall of the mounting hole 410 can limit the outer periphery of the piston pin body 510, and the two fixing blocks 520 or one fixing block 520 and the inner wall of the top or bottom of the piston pin hole 312 can limit the two ends of the piston pin body 510. In this way, the piston pin body 510 can be connected with the piston 310, and after the piston pin body 510 is connected with the connecting rod 400, the connecting rod 400 can be connected with the piston 310.

[0047] In actual assembly, it is usually required that the piston pin and the connecting rod 400 have a high degree of perpendicularity, and it is usually required that the piston pin and the connecting rod 400 are vertically arranged. The piston pin and the connecting rod 400 are connected in a plug-in manner (the piston pin is inserted into the mounting hole 410 of the connecting rod 400 through the piston pin hole 312), which can ensure that the piston pin and the connecting rod 400 have a high degree of perpendicularity, that is, the center line of the mounting hole 410 and the center line of the piston pin are substantially parallel.

[0048] In the related art, the piston pin is in a strip shape, the length of the piston pin matches the length of the piston pin hole 312, that is, the length of the piston pin is substantially the same as the length of the piston pin hole 312 (the length of the piston pin can be equal to, slightly less than, or slightly greater than the length of the piston pin hole 312), and the outer diameter of the piston pin matches the inner diameter of the piston pin hole 312, that is, the outer diameter of the piston pin is substantially the same as the inner diameter of the piston pin hole 312 (the outer diameter of the piston pin can be equal to, slightly less than, or slightly greater than the inner diameter of the piston pin hole 312, in order that the piston pin can be smoothly inserted into the piston pin hole 312, the outer diameter of the piston pin is usually slightly less than the inner diameter of the piston pin hole 312), and the center line of the piston pin installed in the piston pin hole 312 is substantially parallel to the center line of the piston pin hole 312. However, in actual assembly, due to the existence of part processing errors and part assembly errors, the degree of perpendicularity between the connecting rod 400 and the center line of the piston pin hole 312 is often poor, that is, the center line of the mounting hole 410 of the small end of the connecting rod 400 is often inclined at a certain angle relative to the center line of the piston pin hole 312, which easily leads to the situation that the strip-shaped piston pin cannot be assembled.

[0049] It is found through research that when the outer diameter of the piston pin is smaller than the inner diameter of the piston pin hole 312, the outer diameter of the piston pin can be slightly smaller than the inner diameter of the piston pin hole 312 (at this time, it can be considered that the outer diameter of the piston pin matches the inner diameter of the piston pin hole 312), or the outer diameter of the piston pin can be much smaller than the inner diameter of the piston pin hole 312 (at this time, it can be considered that the outer diameter of the piston pin does not match the inner diameter of the piston pin hole 312). When the outer diameter of the piston pin is smaller than the inner diameter of the piston pin hole 312, the piston pin can be inclined at a certain angle in the piston pin hole 312. Among them, when both ends of the piston pin are in contact with the inner wall of the piston pin hole 312, the inclination angle of the piston pin is the largest. According to the principle of a right triangle, the inclination angle of the hypotenuse is related to the length of the piston pin. The longer the length of the piston pin, the smaller the inclination angle of the piston pin in the piston pin hole 312, and the shorter the length of the piston pin, the shorter the inclination angle of the piston pin in the piston pin hole 312. That is, the length of the piston pin determines the inclination angle of the piston pin in the piston pin hole 312.

[0050] Based on the above research findings, in the above piston pin assembly 500, the piston pin assembly 500 is provided to include a piston pin body 510 and a fixing block 520 independent of each other, the length of the piston pin body 510 is smaller than the length of the piston pin hole 312, and the outer diameter of the piston pin is smaller than the inner diameter of the piston pin hole 312, and the fixing block 520 is used to cooperate with another fixing block 520 or the inner wall of the piston pin hole 312 to limit the piston pin body 510 at both ends of the piston pin hole 312, so that the connecting rod 400 is connected with the piston 310 through the above piston pin assembly 500. The above piston pin assembly 500 is split into at least two segments relative to the long strip-shaped piston pin in the related art. That is, the above piston pin assembly 500 is a segmented piston pin relative to the long strip-shaped piston pin in the related art. Therefore, in the above piston pin assembly 500, the length of the piston pin body 510 can be shorter. When the inner diameter of the piston pin hole 312 is constant, the shorter the length of the piston pin body 510, the larger the inclination angle of the piston pin body 510 relative to the center line of the piston pin hole 312.

[0051] Therefore, in actual assembly, when the perpendicularity between the connecting rod 400 and the center line of the piston pin hole 312 is poor due to errors, that is, when the center line of the mounting hole 410 of the small end 404 of the connecting rod 400 is inclined at an angle relative to the center line of the piston pin hole 312 due to errors, the position of the piston pin body 510 can be adjusted by inclining the piston pin body 510 at an angle relative to the center line of the piston pin hole 312, so that the piston pin body 510 can be inserted into the mounting hole 410 of the small end 404 of the connecting rod 400, and the assembly of the piston pin body 510 and the connecting rod 400 is completed. The assembly of the fixed block 520 is mainly related to the piston pin body 510 and the piston pin hole 312, and when the assembly of the piston pin body 510 and the connecting rod 400 is completed, it can be considered that the assembly of the piston pin assembly 500 and the connecting rod 400 is completed. Therefore, when the piston pin assembly 500 is used to connect the connecting rod 400 and the piston 310, the probability of the piston connecting rod device being not assembled due to errors can be reduced.

[0052] Using the piston pin assembly 500 to reduce the probability of the piston connecting rod device being not assembled due to errors can reduce the machining difficulty and cost of each component of the compressor 10. In the related art, the machining error and assembly error are mainly reduced by improving the machining precision of each component of the compressor 10 and the assembly precision of each component, so as to reduce the probability of the piston pin being not assembled. This way of reducing the probability of the piston pin being not assembled increases the machining difficulty and cost of each component of the compressor 10.

[0053] In this embodiment, the length of the piston pin body 510 is greater than the length of the mounting hole 410. In this way, in the compressor 10, both ends of the piston pin body 510 can be located outside the mounting hole 410 at the same time, and further more, the fixed block 520 and the inner wall of the piston pin hole 312 can limit the piston pin body 510. Specifically, in this example, the length of the piston pin body 510 is 1.1-1.3 times the length of the mounting hole 410.

[0054] In the present embodiment, the outer diameter of the piston pin body 510 matches the inner diameter of the mounting hole 410, i.e. the outer diameter of the piston pin body 510 is equal to, slightly smaller than or slightly larger than the inner diameter of the mounting hole 410. In this way, the piston pin body 510 mounted in the mounting hole 410 is arranged substantially coaxially with the mounting hole 410, so that the piston pin body 510 and the connecting rod 400 have a higher perpendicularity. Specifically, in the present embodiment, the piston pin body 510 is clearance fit with the mounting hole 410, i.e. the outer diameter of the piston pin body 510 is slightly smaller than the inner diameter of the mounting hole 410. In this way, the piston pin body 510 is more convenient to assemble in the mounting hole 410. It can be understood that in other embodiments, the piston pin body 510 can also be non-clearance fit with the mounting hole 410, when the piston pin body 510 is non-clearance fit with the mounting hole 410, it can be considered that the piston pin body 510 cannot be inclined relative to the center line of the mounting hole 410.

[0055] In the present embodiment, the length of the piston pin body 510 is 0.3-0.8 times the length of the piston pin hole 312. If the length of the piston pin body 510 is too short, it is not conducive to the cooperation between the piston pin body 510 and the mounting hole 410, and if the length of the piston pin body 510 is too long, it will cause the inclination angle of the piston pin body 510 to be too small. Considering the above factors, the length of the piston pin body 510 is set to be 0.3-0.8 times the length of the piston pin hole 312. Specifically, in the present embodiment, the length of the piston pin body 510 is 0.5-0.6 times the length of the piston pin hole 312.

[0056] In the present embodiment, since the length of the piston pin body 510 is smaller than the length of the piston pin hole 312, at least part of the at least one fixing block 520 can be accommodated in the piston pin hole 312. In this way, the piston pin hole 312 can play a positioning role in the assembly of the fixing block 520, so that the fixing block 520 is more convenient to assemble. Specifically, in the present embodiment, the piston pin assembly 500 has two fixing blocks 520, both of which are accommodated in the piston pin hole 312. In this way, the protruding fixing block 520 can be avoided to interfere with the related elements of the compressor 10. It can be understood that in other embodiments, part of the at least one fixing block 520 can protrude out of the piston pin hole 312.

[0057] In the present embodiment, the outer diameter of the fixing block 520 matches the inner diameter of the piston pin hole 312, i.e. the outer diameter of the fixing block 520 is equal to, slightly smaller than, or slightly equal to the inner diameter of the piston pin hole 312. In this way, the fixing block 520 is more convenient to be fixedly connected with the piston 310. Specifically, in the present embodiment, the fixing block 520 can be in clearance fit with the piston pin hole 312, i.e. the outer diameter of the fixing block 520 is slightly smaller than the inner diameter of the piston pin hole 312. In this way, the fixing block 520 is more convenient to be assembled. More specifically, in the present embodiment, the outer diameter of the piston pin body 510 is less than or equal to the outer diameter of the fixing block 520. When the outer diameter of the piston pin body 510 is equal to the outer diameter of the fixing block 520, the same material can be used to manufacture the piston pin body 510 and the fixing block 520, thereby being more convenient for production and manufacturing.

[0058] It should be noted that, in the present embodiment, when a certain element is in clearance fit with a certain hole, and the outer diameter of the element matches the inner diameter of the hole, it means that the element can be inclined relative to the center line of the hole, and the maximum angle of inclination is greater than or equal to 1° and less than 5°. Specifically, in the present embodiment, when the outer diameter of the piston pin body 510 is less than the inner diameter of the piston pin hole 312 (i.e. the piston pin body 510 can be in clearance fit with the piston pin hole 312), and the outer diameter of the piston pin body 510 matches the inner diameter of the piston pin hole 312, the piston pin body 510 can be inclined relative to the center line of the piston pin hole 312, and the maximum angle of inclination is greater than or equal to 1° and less than 5°; when the piston pin body 510 can be in clearance fit with the mounting hole 410, and the outer diameter of the piston pin body 510 matches the inner diameter of the mounting hole 410, the piston pin body 510 can be inclined relative to the center line of the mounting hole 410, and the maximum angle of inclination is greater than or equal to 1° and less than 5°; when the fixing block 520 can be in clearance fit with the piston pin hole 312, and the outer diameter of the fixing block 520 matches the inner diameter of the piston pin hole 312, the fixing block 520 can be inclined relative to the center line of the piston pin hole 312, and the maximum angle of inclination is greater than or equal to 1° and less than 5°.

[0059] It should be noted that, in the present embodiment, when a certain element is in clearance fit with a certain hole, and the outer diameter of the element matches the inner diameter of the hole, it means that the element can be inclined relative to the center line of the hole, and the maximum angle of inclination is greater than or equal to 1° and less than 5°. Specifically, in the present embodiment, when the outer diameter of the piston pin body 510 is less than the inner diameter of the piston pin hole 312 (i.e. the piston pin body 510 can be in clearance fit with the piston pin hole 312), and the outer diameter of the piston pin body 510 matches the inner diameter of the piston pin hole 312, the piston pin body 510 can be inclined relative to the center line of the piston pin hole 312, and the maximum angle of inclination is greater than or equal to 1° and less than 5°; when the piston pin body 510 can be in clearance fit with the mounting hole 410, and the outer diameter of the piston pin body 510 matches the inner diameter of the mounting hole 410, the piston pin body 510 can be inclined relative to the center line of the mounting hole 410, and the maximum angle of inclination is greater than or equal to 1° and less than 5°; when the fixing block 520 can be in clearance fit with the piston pin hole 312, and the outer diameter of the fixing block 520 matches the inner diameter of the piston pin hole 312, the fixing block 520 can be inclined relative to the center line of the piston pin hole 312, and the maximum angle of inclination is greater than or equal to 1° and less than 5°.

[0060] In the present embodiment, as shown in FIG. 4, the outer diameter of the piston pin body 510 is less than the inner diameter of the piston pin hole 312, i.e. the piston pin body 510 can be in clearance fit with the piston pin hole 312. Figures 1-6As shown, one end of the piston pin body 510 has a first convex spherical surface 512, and the other end has a second convex spherical surface 514. One fixing block 520 (a first fixing block 520a) has a third concave spherical surface 522, and the other fixing block 520 (a second fixing block 520b) has a fourth concave spherical surface 524 or the inner wall of the piston pin hole 312 has the fourth concave spherical surface 524. The first spherical surface 512 and the third spherical surface 522 are in sliding fit, and the second spherical surface 514 and the fourth spherical surface 524 are in sliding fit, that is, the first spherical surface 512 can slide (rotate) in the third spherical surface 522, and the second spherical surface 514 can slide (rotate) in the fourth spherical surface 524. In this way, the piston pin body 510 can be tilted in any direction, and after tilting, the fixing block 520 or the inner wall of the piston pin hole 312 can still well limit the piston pin body 510, at this time, it can be considered that the piston pin body 510 has a universal function relative to the fixing block 520 or the inner wall of the piston pin hole 312. Moreover, the sliding fit of the spherical surface and the spherical surface is more conducive to the lubricating effect of the lubricating oil between the first spherical surface 512 and the third spherical surface 522 and between the second spherical surface 514 and the fourth spherical surface 524.

[0061] It can be understood that in other embodiments, at least one of the first spherical surface 512, the second spherical surface 514, the third spherical surface 522 and the fourth spherical surface 524 can be omitted or replaced by other structures, for example, the first spherical surface 512 and the second spherical surface 514 can both be flat surfaces, and the third spherical surface 522 and the fourth spherical surface 524 can both have clamping grooves matched with the structure formed by the end surface and the side surface of the tilted piston pin body 510.

[0062] In this embodiment, the first spherical surface 512 can be completely accommodated in the third spherical surface 522, that is, at a certain position, the edge of the first spherical surface 512 coincides with the edge of the third spherical surface 522 or the edge of the first spherical surface 512 is located inside the edge of the third spherical surface 522. The second spherical surface 514 can be completely accommodated in the fourth spherical surface 524, that is, at a certain position, the edge of the second spherical surface 514 coincides with the edge of the third spherical surface 522 or the edge of the second spherical surface 514 is located inside the edge of the fourth spherical surface 524. In this way, it is more conducive to the limiting of the fixing block 520 to the piston pin body 510. It can be understood that in other embodiments, at a certain position, the edge of the first spherical surface 512 can also be located outside the edge of the third spherical surface 522, and / or the edge of the second spherical surface 514 can also be located outside the edge of the fourth spherical surface 524.

[0063] In this embodiment, the first spherical surface 512 and the second spherical surface 514 are symmetrically arranged, and the symmetry axis of the first spherical surface 512 and the second spherical surface 514 is perpendicular to the center line of the piston pin body 510. In this way, when the piston pin body 510 is installed, it is not necessary to distinguish the assembly direction of the piston pin body 510, which is more convenient for assembly and can improve the assembly efficiency and production efficiency of the compressor.

[0064] In the present embodiment, the first spherical surface 512 is in clearance fit with the third spherical surface 522, and the second spherical surface 514 is in clearance fit with the fourth spherical surface 524. In this way, the friction can be reduced.

[0065] In the present embodiment, the piston pin body 510 has an axial through hole 516 extending through the piston pin body 510 along the axial direction. The fixing block 520 has an axial passage 526 extending through the fixing block 520 along the axial direction. When the fixing block 520 limits the piston pin body 510, the axial passage 526 communicates with the axial through hole 516. In this way, when the compressor is working, the lubricating oil can enter the axial through hole 516 through the axial passage 526, and the lubricating oil can flow in the oil passage formed by the axial through hole 516 and the axial passage 526, so that the lubricating oil can lubricate the first spherical surface 512 and the third spherical surface 522, and can also lubricate the second spherical surface 514 and the fourth spherical surface 524, which is very convenient for the lubricating oil to lubricate the junction of the piston pin body 510 and the fixing block 520. Specifically, in the present embodiment, the inner diameter of the axial passage 526 is greater than the inner diameter of the axial through hole 516. In this way, it is more conducive for the lubricating oil to enter the axial through hole 516 through the axial passage 526.

[0066] In the present embodiment, an oil groove 518 extending along the circumferential direction of the piston pin body 510 is formed on the outer side wall of the piston pin body 510. The bottom wall of the oil groove 518 is provided with an oil passage hole 519 communicating with the axial through hole 516. In this way, when the compressor is working, the lubricating oil can enter the axial through hole 516 through the axial passage 526, and then enter the oil groove 518 through the oil passage hole 519, so that the lubricating oil can lubricate the outer wall of the piston pin body 510 and the inner wall of the mounting hole 410 of the connecting rod 400.

[0067] In the present embodiment, the center point of the first spherical surface 512 and the center point of the second spherical surface 514 are both located on the center line of the axial through hole 516. And in the present embodiment, the center line of the axial through hole 516 and the center line of the piston pin body 510 substantially coincide.

[0068] In the present embodiment, the oil groove 518 extends along the circumferential direction of the piston pin body 510 for one turn, that is, the oil groove 518 is annular. In this way, it is more conducive for the lubricating oil to lubricate the outer wall of the piston pin body 510 and the inner wall of the mounting hole 410 of the connecting rod 400. It can be understood that in other embodiments, the oil groove 518 can also be arc-shaped, for example, the corresponding central angle of the arc-shaped oil groove 518 can be 30°, 60°, 120°, 150°, etc.

[0069] In the present embodiment, the oil passage hole 519 extends along the radial direction of the piston pin body 510. In this way, compared with the inclined extension, the oil passage hole 519 extending along the radial direction of the piston pin body 510 can make the length of the oil passage hole 519 smaller, so that it is more conducive for the lubricating oil to flow out.

[0070] In the embodiment, the first spherical surface 512 and the second spherical surface 514 are symmetrically arranged about the center line of the oil passage 519. That is, the oil groove 518 and the oil passage 519 are located at the middle part of the pin body 510, so as to facilitate the uniform lubrication of the lubricating oil. It can be understood that in other embodiments, the oil groove 518 and the oil passage 519 can also be located at the end of the pin body 510, or between the end and the middle of the pin body 510.

[0071] In the embodiment, the center point of the third spherical surface 522 or the center point of the fourth spherical surface 524 is on the center line of the axial passage 526. Specifically, in the embodiment, the center line of the axial passage 526 is substantially coincident with the center line of the fixed block 520.

[0072] In the embodiment, the end surface of the fixed block 520 away from the pin body 510 is a plane.

[0073] In the embodiment, as shown in Figure 2 , Figure 7 and Figure 8 , the above-mentioned piston pin assembly 500 further comprises a fixing member 530. The fixed block 520 is fixedly connected with the piston 310 through the fixing member 530. Specifically, in the embodiment, the fixed block 520 has a fixing hole 528, which penetrates through the opposite two sides of the fixed block 520. The inner wall of the piston pin hole 312 has a connecting through hole 316 and a connecting blind hole 318, the connecting through hole 316 corresponds to one end of the fixing hole 528, and the connecting blind hole 318 corresponds to the other end of the fixing hole 528, and the fixing member 530 is sequentially arranged in the connecting through hole 316, the fixing hole 528 and the connecting blind hole 318. It can be understood that in other embodiments, the fixing member 530 can be an adhesive layer, and at this time, the fixing member 530 is located between the inner wall of the piston pin hole 312 and the outer wall of the fixed block 520. It can be understood that in other embodiments, the fixing member 530 can also be omitted, and at this time, the fixed block 520 can be fixed to the inner wall of the piston pin hole 312 in a welding manner.

[0074] The above-mentioned only for the optional embodiments of the present application, not therefore limit the patent scope of the present application, any equivalent structural transformation made under the inventive concept of the present application, using the contents of the present application and the drawings, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A piston connecting rod arrangement, characterized by The piston has a piston pin hole. The connecting rod has a mounting hole. The piston pin assembly includes a piston pin body and a fixing block, the length of the piston pin body is less than the length of the piston pin hole, the outer diameter of the piston pin body is less than the inner diameter of the piston pin hole, the piston pin body is inserted into the mounting hole through the piston pin hole, the fixing block is arranged in the piston pin hole and cooperates with another fixing block or the inner wall of the piston pin hole to limit the piston pin body at both ends of the piston pin hole. One end of the piston pin body has a first convex spherical surface, and the other end has a second convex spherical surface; the fixing block has two first and second fixing blocks, the first fixing block has a third concave spherical surface, and the second fixing block has a fourth concave spherical surface. Alternatively, the fixing block has a third concave spherical surface, and the inner wall of the piston pin hole has a fourth concave spherical surface; the first spherical surface and the third spherical surface are in sliding cooperation, and the second spherical surface and the fourth spherical surface are in sliding cooperation. The length of the piston pin body is greater than the length of the mounting hole. The length of the piston pin body is 1.1-1.3 times the length of the mounting hole.

2. The piston connecting rod arrangement of claim 1 wherein, The outer diameter of the piston pin body matches the inner diameter of the mounting hole, and the piston pin body and the mounting hole are in clearance fit.

3. The piston connecting rod arrangement of claim 2 wherein, The length of the piston pin body is 0.3-0.8 times the length of the piston pin hole.

4. The piston connecting rod arrangement of claim 1 wherein, The outer diameter of the fixing block matches the inner diameter of the piston pin hole, and the fixing block and the piston pin hole are in clearance fit.

5. The piston connecting rod arrangement of claim 1 wherein, The outer diameter of the piston pin body is less than or equal to the outer diameter of the fixing block.

6. The piston connecting rod arrangement of claim 1 wherein, The end of the piston pin body and the fixing block or the inner wall of the piston pin hole are in clearance fit; and / or 7. The piston connecting rod arrangement of claim 6 wherein, The piston pin assembly further includes a fixing member connecting the fixing block and the piston.

8. The piston connecting rod arrangement of claim 1 wherein, The first spherical surface can be completely accommodated in the third spherical surface, and the second spherical surface can be completely accommodated in the fourth spherical surface. The first spherical surface and the second spherical surface are symmetrically arranged, and the symmetry axis of the first spherical surface and the second spherical surface is perpendicular to the center line of the piston pin body.

9. The piston connecting rod arrangement as described in claim 1, wherein, The piston pin body has an axial through hole extending through it in the axial direction, and the fixing block has an axial channel extending through it in the axial direction, and the axial channel communicates with the axial through hole.

10. The piston connecting rod arrangement of claim 1 wherein, The inner diameter of the axial channel is greater than the inner diameter of the axial through hole; and / or 11. The piston connecting rod arrangement as described in claim 1, wherein, An oil groove extending in the circumferential direction is formed on the outer side wall of the piston pin body, and a through oil hole communicating with the axial through hole is formed in the bottom wall of the oil groove.

12. The piston connecting rod arrangement of claim 11 wherein, The piston connecting rod device includes the piston connecting rod device according to any one of claims 1-12. ​ 13. A compressor characterized by, ​

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