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 has a piston pin hole, and the connecting rod has a mounting hole; the piston pin assembly comprises a piston pin body and a fixing block; the outer diameter of the piston pin body is smaller than the inner diameter of the piston pin hole, so that the center line of the piston pin body can be inclined relative to the center line 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 on the piston and cooperates with the inner wall of the piston pin hole or another fixing block to limit the piston pin body at both ends of the piston pin body and define the inclined plane of the center line of the piston pin body. The piston connecting rod device can reduce the probability that the piston pin assembly cannot be assembled.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a piston connecting rod device and a compressor. Background Technology

[0002] In a fully enclosed reciprocating compressor, the motor drives the crankshaft to rotate. The connecting rod, connected to the crankshaft, is connected to the piston via a piston pin, causing the piston to reciprocate within the cylinder, thus completing the compression and exhaust process. In actual assembly, a high degree of perpendicularity between the piston pin and the connecting rod is typically required; ideally, the piston pin and connecting rod should be perpendicular. In related technologies, the outer diameter of the piston pin matches the inner diameter of the piston pin bore, and the centerline of the piston pin installed in the piston pin bore is substantially parallel to the centerline of the piston pin bore. However, in actual assembly, due to machining and assembly errors, a difference in perpendicularity between the centerlines of the connecting rod and the piston pin bore often occurs, easily leading to situations where long, narrow piston pins cannot be properly assembled. Summary of the Invention

[0003] The main objective of this invention is to provide a piston connecting rod device that reduces the probability of piston pins failing to assemble.

[0004] To achieve the above objectives, the present invention provides a piston connecting rod device comprising:

[0005] Piston, with piston pin hole;

[0006] Linkage rod, having mounting holes; and

[0007] A piston pin assembly includes a piston pin body and a fixing block. The outer diameter of the piston pin body is smaller than the inner diameter of the piston pin hole, so that the centerline of the piston pin body can be inclined relative to the centerline of the piston pin hole. The piston pin body is inserted into the mounting hole through the piston pin hole. The fixing block is disposed on the piston and cooperates with another fixing block or the inner wall of the piston pin hole. The fixing block limits the piston pin body at both ends and defines the inclined plane of the centerline of the piston pin body.

[0008] In one embodiment, the maximum angle at which the centerline of the piston pin body is inclined relative to the centerline of the piston pin hole is 5°-15°.

[0009] In one embodiment, one end of the piston pin body has a first protrusion and the other end has a second protrusion, one of the fixing blocks has a first groove, and the inner wall of the other fixing block or the piston pin hole has a second groove.

[0010] The first protrusion can slide within the first groove, and the second protrusion can slide within the second groove. The inclined plane is determined by the sliding directions of the first protrusion and the second protrusion.

[0011] In one embodiment, the first protrusion has a first convex arc surface, the second protrusion has a second convex arc surface, the inner wall of the first groove has a third arc surface that slides with the first arc surface, and the second groove has a fourth arc surface that slides with the second arc surface.

[0012] In one embodiment, one end of the piston pin body has two opposing first notches, and the other end has two opposing second notches. The two second notches are paired with the two first notches one-to-one. The two first notches define the first protrusion, and the two second notches define the second protrusion. The inner wall of the first notch has a first side surface, and the inner wall of the second notch has a second side surface.

[0013] The inner wall of the first groove also includes two first limiting surfaces arranged opposite to each other, and the two first limiting surfaces are respectively arranged one-to-one with the first side surface of the two first notches. The inner wall of the second groove also includes two second limiting surfaces arranged opposite to each other, and the two second limiting surfaces are respectively arranged one-to-one with the second side surface of the two second notches.

[0014] The first side, the second side, the first limiting surface, and the second limiting surface are all parallel to the inclined plane.

[0015] In one embodiment, the plane defined by the direction of movement of the piston and the centerline of the piston pin hole is parallel to the inclined plane.

[0016] In one 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 clearance-fitted.

[0017] In one embodiment, the piston pin body has an axial through hole extending along its axial direction, and the fixing block has an axial channel extending along its axial direction, the axial channel communicating with the axial through hole.

[0018] In one embodiment, the inner diameter of the axial channel is larger than the inner diameter of the axial through hole;

[0019] And / or, an oil groove extending circumferentially is provided on the outer side wall of the piston pin body, and an oil passage hole communicating with the axial through hole is provided on the bottom wall of the oil groove.

[0020] In one embodiment, the end of the piston pin body is clearance-fitted with the inner wall of the fixing block or the piston pin hole.

[0021] In one embodiment, the piston pin assembly further includes a retainer that connects the retaining block to the piston.

[0022] The present invention also proposes a compressor including the piston connecting rod device described above.

[0023] In the aforementioned piston pin assembly, the outer diameter of the piston pin body is smaller than the inner diameter of the piston pin bore, allowing the piston pin body to tilt relative to the centerline of the piston pin bore. Therefore, in actual assembly, if errors cause poor perpendicularity between the connecting rod and the centerline of the piston pin bore—that is, if errors cause the centerline of the mounting hole at the small end of the connecting rod to tilt at a certain angle relative to the centerline of the piston pin bore—the position of the piston pin body can be adjusted by tilting it at a certain angle relative to the centerline of the piston pin bore. This allows the piston pin body to be inserted into the mounting hole at the small end of the connecting rod, thus completing the assembly of the piston pin body. The assembly of the fixing block is mainly related to the piston pin body and the piston pin bore. Once the piston pin body and connecting rod are assembled, the assembly of the piston pin assembly and connecting rod can be considered complete. Therefore, using the aforementioned piston pin assembly to connect the connecting rod and piston can reduce the probability of the piston pin assembly failing to assemble due to errors. Furthermore, since the inclined plane of the piston pin body is determined by the two fixing blocks at both ends of the piston pin body or by one fixing block at both ends of the piston pin body and the inner wall of the bottom or top of the piston pin hole, the position adjustment and assembly of the piston pin body has a positioning function, which makes the position adjustment and assembly of the piston pin body more convenient. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a partial cross-sectional schematic diagram of a compressor according to an embodiment of the present invention;

[0026] Figure 2 This is a cross-sectional schematic diagram of a piston connecting rod device according to an embodiment of the present invention;

[0027] Figure 3 This is a three-dimensional structural schematic diagram of a piston connecting rod device according to an embodiment of the present invention;

[0028] Figure 4 This is a cross-sectional schematic diagram of the piston pin body of a piston connecting rod device according to an embodiment of the present invention;

[0029] Figure 5 This is a three-dimensional structural schematic diagram of the piston pin body of a piston connecting rod device according to an embodiment of the present invention;

[0030] Figure 6 This is a side view of one side of the piston pin body of a piston connecting rod device according to an embodiment of the present invention;

[0031] Figure 7 This is a side view of the piston pin body on the other side of a piston connecting rod device according to an embodiment of the present invention;

[0032] Figure 8 This is a three-dimensional structural diagram of the fixing block of a piston connecting rod device according to an embodiment of the present invention;

[0033] Figure 9 This is a top view of the fixing block of a piston connecting rod device according to an embodiment of the present invention;

[0034] Figure 10 This is a cross-sectional schematic diagram of the fixing block of a piston connecting rod device according to an embodiment of the present invention.

[0035] Explanation of icon numbers:

[0036] label name label name 10 compressor 200 crankshaft 300 cylinder 400 link 402 The large end of the connecting rod 404 small end of the connecting rod 500 Piston pin assembly 310 piston 312 Piston pin hole 510 Piston pin body 520 Fixed block 410 Mounting holes 314 disassembly / reassembly port 520a First fixing block 520b Second fixing block 510a First protrusion 510b Second protrusion 520c First groove 512a First gap 514a Second gap 512 First curved surface 514 Second curved surface 522 Third curved surface 524 Fourth arc surface 516 Axial through hole 518 oil tank 519 Oil passage 526 Axial channel 530 Fasteners 316 Connecting through hole 318 Connecting blind holes 528 Fixing hole

[0037] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

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

[0040] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0041] This invention proposes a compressor.

[0042] In embodiments of the present invention, such as Figure 1 As 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. In this embodiment, 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 piston pin hole 312. The ideal corresponding position of mounting hole 410 and piston pin hole 312 is such that the center line of mounting hole 410 is parallel to, or even coincides with, the center line of piston pin hole 312. In this case, it is considered that there is good perpendicularity between the center lines of connecting rod 400 and piston pin hole 312.

[0044] In this embodiment, the piston pin assembly 500 includes a piston pin body 510 and a fixing block 520. The piston pin body 510 is inserted into the mounting hole 410 through the piston pin hole 312 and fixed to the piston 310. The outer diameter of the piston pin body 510 is smaller than the inner diameter of the piston pin hole 312, so that the centerline of the piston pin body 510 can be inclined relative to the centerline of the piston pin hole 312. That is, the piston pin body 510 can move within the piston pin hole 312, so that the centerline of the piston pin body 510 can be inclined relative to the centerline of the piston pin hole 312.

[0045] A fixing block 520 is disposed on the piston 310. 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. 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 body 510, and the first fixing block 520a and the second fixing block 520b cooperate to limit the piston pin body 510 at both ends. 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.

[0046] It should be noted that when the piston pin body 510 is located within the piston pin hole 312, the inner wall of the piston pin hole 312 can limit the outer periphery of the piston pin body 510. After adjusting the position of the piston pin body 510, that is, after adjusting the inclination of the centerline of the piston pin body 510 relative to the centerline of the piston pin hole 312, 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 both ends of the piston pin body 510. In this way, the piston pin body 510 can be connected to the piston 310. When the piston pin body 510 is connected to the connecting rod 400, the connecting rod 400 can be connected to the piston 310.

[0047] In this embodiment, one fixing block 520 cooperates with another fixing block 520 or the inner wall of the piston pin hole 312, limiting the piston pin body 510 at both ends while defining the inclined plane of the center line of the piston pin body 510. That is, in this embodiment, the piston pin body 510 cannot tilt back and forth in any plane. The piston pin body 510 has a defined inclined plane, and the center line of the piston pin body 510 can tilt back and forth in this inclined plane. This inclined plane is determined by the two fixing blocks 520 at both ends of the piston pin body 510 or by one fixing block 520 at both ends of the piston pin body 510 and the inner wall of the bottom or top of the piston pin hole 312.

[0048] In actual assembly, a high degree of perpendicularity is usually required between the piston pin and the connecting rod 400. Ideally, the piston pin and connecting rod 400 should be set perpendicularly. The piston pin and connecting rod 400 are connected by an insertion method (the piston pin is inserted into the mounting hole 410 of the connecting rod 400 through the piston pin hole 312), which can ensure a high degree of perpendicularity between the piston pin and the connecting rod 400, and also ensure that the center line of the mounting hole 410 is basically parallel to the center line of the piston pin.

[0049] In related technologies, the outer diameter of the piston pin matches the inner diameter of the piston pin bore 312, meaning the outer diameter of the piston pin is approximately the same as the inner diameter of the piston pin bore 312 (the outer diameter of the piston pin can be equal to, slightly less than, or slightly larger than the inner diameter of the piston pin bore 312). The centerline of the piston pin installed in the piston pin bore 312 is basically parallel to the centerline of the piston pin bore 312. However, in actual assembly, due to machining and assembly errors, a perpendicularity difference often occurs between the centerline of the connecting rod 400 and the centerline of the piston pin bore 312. This means the centerline of the mounting hole 410 at the small end of the connecting rod 400 often tilts at a certain angle relative to the centerline of the piston pin bore 312, which can easily lead to the piston pin not being properly installed. Even if the outer diameter of the piston pin is set slightly smaller than the inner diameter of the piston pin bore 312 to allow the piston pin to be smoothly inserted into the piston pin bore 312, and the piston pin can tilt relative to the centerline of the piston pin bore 312, the tilt angle is very small and usually negligible.

[0050] In the aforementioned piston pin assembly 500, the outer diameter of the piston pin body 510 is smaller than the inner diameter of the piston pin hole 312, allowing the piston pin body 510 to tilt relative to the centerline of the piston pin hole 312. Therefore, in actual assembly, when errors cause poor perpendicularity between the connecting rod 400 and the centerline of the piston pin hole 312—that is, when errors cause the centerline of the mounting hole 410 at the small end 404 of the connecting rod 400 to tilt at a certain angle relative to the centerline of the piston pin hole 312—the position of the piston pin body 510 can be adjusted by tilting it at a certain angle relative to the centerline of the piston pin hole 312. This allows the piston pin body 510 to be inserted into the mounting hole 410 at the small end 404 of the connecting rod 400, thus enabling the piston pin body 510 to complete the assembly. The assembly of the fixing block 520 is mainly related to the piston pin body 510 and the piston pin hole 312. Once the piston pin body 510 and the connecting rod 400 are assembled, the assembly of the piston pin assembly 500 and the connecting rod 400 can be considered complete. Therefore, using the piston pin assembly 500 to connect the connecting rod 400 and the piston 310 can reduce the probability of the piston pin assembly 500 failing to assemble due to errors.

[0051] Furthermore, since the inclined plane of the piston pin body 510 is determined by the two fixing blocks 520 at both ends of the piston pin body 510 or by one fixing block 520 at both ends of the piston pin body 510 and the inner wall of the bottom or top of the piston pin hole 312, when adjusting the position of the piston pin body 510, it is equivalent to the position adjustment and assembly of the piston pin body 510 having a positioning function, which makes the position adjustment and assembly of the piston pin body 510 easier.

[0052] Furthermore, using the aforementioned piston pin assembly 500 to reduce the probability of the piston pin assembly 500 failing to assemble due to errors can reduce the processing difficulty and cost of the compressor 10 components. In related technologies, processing and assembly errors are mainly reduced by improving the processing accuracy and assembly accuracy of the compressor 10 components, thereby reducing the probability of the piston pin failing to assemble. However, this method of reducing the probability of the piston pin failing to assemble increases the processing difficulty and cost of the compressor 10 components.

[0053] It should be noted that when the piston pin body 510 is inserted into the piston pin hole 312 along the centerline of the piston pin hole 312, since the outer diameter of the piston pin body 510 is smaller than the inner diameter of the piston pin hole 312, at least one side of the outer wall of the piston pin body 510 can be spaced a certain distance from the inner wall of the piston pin hole 312, thus allowing the piston pin body 510 to tilt at a certain angle relative to the centerline of the piston pin hole 312. It can be understood that the tilt angle of the piston pin body 510 is greatest when both ends of the piston pin body 510 are in contact with the inner wall of the piston pin hole 312.

[0054] It should also be noted that, in this embodiment, "matching the outer diameter of a component with the inner diameter of a hole" means that the outer diameter of the component is equal to, slightly less than, or slightly greater than the inner diameter of the hole. Even if the outer diameter of the component is slightly smaller than the inner diameter of the hole, in this case, even if the centerline of the component can be tilted relative to the centerline of the hole, the maximum angle of tilt will be less than 5°. In this embodiment, the centerline of the piston pin body 510 can be tilted relative to the centerline of the piston pin hole 312, and the maximum angle of tilt is greater than or equal to 5°. That is, in this embodiment, the outer diameter of the piston pin body 510 does not match the inner diameter of the piston pin hole 312.

[0055] In this embodiment, the maximum angle of inclination of the centerline of the piston pin body 510 relative to the centerline of the piston pin hole 312 is less than or equal to 15°. After the outer diameter and length of the piston pin body 510 are determined, a larger maximum angle of inclination requires a larger inner diameter of the piston pin hole 312. A larger inner diameter of the piston pin hole 312 results in a larger piston 310. Therefore, the maximum angle of inclination should not be too large. Conversely, a maximum angle of inclination that is too small cannot effectively reduce the probability of the piston pin assembly 500 failing to assemble due to errors. Considering all these factors, the maximum angle of inclination is less than or equal to 15°.

[0056] In this embodiment, the outer diameter of the piston pin body 510 matches the inner diameter of the mounting hole 410, meaning the outer diameter of the piston pin body 510 is equal to, slightly less than, or slightly greater than the inner diameter of the mounting hole 410. Thus, the piston pin body 510 installed in the mounting hole 410 is substantially coaxial with the mounting hole 410, allowing for a higher degree of perpendicularity between the piston pin body 510 and the connecting rod 400. Specifically, in this embodiment, the piston pin body 510 and the mounting hole 410 are in a clearance fit, meaning the outer diameter of the piston pin body 510 is slightly smaller than the inner diameter of the mounting hole 410. This facilitates the assembly of the piston pin body 510 into the mounting hole 410. It is understood that in other embodiments, the piston pin body 510 may also be in a non-clearance fit with the mounting hole 410. When the piston pin body 510 is in a non-clearance fit with the mounting hole 410, it can be assumed that the piston pin body 510 cannot be tilted relative to the centerline of the mounting hole 410.

[0057] It is understandable that the piston pin's tilt angle is greatest when both ends of the piston pin are in contact with the inner wall of the piston pin hole 312. When the inner diameter of the piston pin hole 312 remains constant, according to the principle of a right triangle, the maximum tilt angle of the hypotenuse is related to the length of the piston pin. The longer the piston pin, the smaller the maximum tilt angle within the piston pin hole 312; conversely, the shorter the piston pin, the shorter the maximum tilt angle. When the length of the piston pin body 510 remains constant, according to the principle of a right triangle, the maximum tilt angle of the hypotenuse is related to the inner diameter of the piston pin hole 312. The smaller the inner diameter of the piston pin hole 312, the smaller the maximum tilt angle; and the larger the inner diameter, the larger the maximum tilt angle. Therefore, in this embodiment, the length of the piston pin body 510 can be equal to, less than, or greater than the length of the piston pin hole 312.

[0058] The length of the piston pin body 510 can be equal to, less than, or greater than the length of the piston pin hole 312, so that the fixing block 520 can be completely located outside the piston pin hole 312, or the fixing block 520 can be at least partially located inside the piston pin hole 312. In this embodiment, the piston pin assembly 500 has two fixing blocks 520, both of which are accommodated within the piston pin hole 312. This avoids the protruding fixing blocks 520 interfering with the relevant components of the compressor 10. It is understood that in other embodiments, at least one fixing block 520 may partially protrude outside the piston pin hole 312.

[0059] In this embodiment, the outer diameter of the fixing block 520 matches the inner diameter of the piston pin hole 312, that is, the outer diameter of the fixing block 520 is equal to, slightly less than, or slightly equal to the inner diameter of the piston pin hole 312. This facilitates the fixed connection between the fixing block 520 and the piston 310. Specifically, in this embodiment, the fixing block 520 can be clearance-fitted with the piston pin hole 312, that is, the outer diameter of the fixing block 520 is slightly smaller than the inner diameter of the piston pin hole 312. This facilitates the assembly of the fixing block 520. It should be noted that in this embodiment, the matching of the outer diameter of the fixing block 520 with the inner diameter of the piston pin hole 312 implies that the outer diameter of the fixing block 520 is larger than the outer diameter of the piston pin body 510.

[0060] In this embodiment, as Figures 1-10As shown, one end of the piston pin body 510 has a first protrusion 510a, and the other end has a second protrusion 510b. One fixing block 520 has a first groove 520c, and the inner wall of the other fixing block 520 or the piston pin hole 312 has a second groove. The first protrusion 510a can slide (rotate) within the first groove 520c, and the second protrusion 510b can slide (rotate) within the second groove. The inclined plane of the piston pin body 510 is determined by the sliding direction of the first protrusion 510a and the second protrusion 510b. This makes it very convenient for the two fixing blocks 520, or one fixing block 520 and the inner wall of the bottom or top of the piston pin hole 312, to define the inclined plane of the piston pin body 510.

[0061] In this embodiment, one end of the piston pin body 510 has a convex first arc surface 512, and the other end has a convex second arc surface 514. That is, the first protrusion 510a has a convex first arc surface 512, and the second protrusion 510b has a convex second arc surface 514. The inner wall of the first groove 520c has a third arc surface 522 that slides with the first arc surface 512, and the second groove has a fourth arc surface 524 that slides with the second arc surface 514. This facilitates the sliding (rotation) of the first protrusion 510a in the first groove 520c and the sliding (rotation) of the second protrusion 510b in the second groove, and also facilitates the lubricating effect of the lubricating oil between the first arc surface 512 and the third arc surface 522, and between the second arc surface 514 and the fourth arc surface 524.

[0062] It is understood that in other embodiments, at least one of the first arc surface 512, the second arc surface 514, the third arc surface 522, and the fourth arc surface 524 may not be an arc surface, but may be replaced by other structures. For example, the first arc surface 512 and the second arc surface 514 may both be planes, while the third arc surface 522 and the fourth arc surface 524 may both have slots that match the structure formed by the end face and the side face of the inclined piston pin body 510.

[0063] In this embodiment, one end of the piston pin body 510 has two opposing first notches 512a, and the other end of the piston pin body 510 has two opposing second notches 514a, with each of the two second notches 514a corresponding to one of the two first notches 512a. The two first notches 512a define a first protrusion 510a, and the two second notches 514a define a second protrusion 510b. A first arc surface 512 is located between the two first notches 512a, and a second arc surface 514 is located between the two second notches 514a. This facilitates the manufacturing of the piston pin body 510 and allows it to slide in a certain direction. It is understood that in other embodiments, only one first notch 512a and one second notch 514a may be provided.

[0064] In this embodiment, the inner wall of the first notch 512a has an orthogonal first side surface and a first end surface, that is, the first side surface and the first end surface are perpendicularly connected. The first side surface is located in the arrangement direction of the two first notches 512a, and the first end surface is located in the length direction of the piston pin body 510. The inner wall of the first groove 520c includes two opposing first limiting surfaces and a third arc surface 522, which connects the two opposing first limiting surfaces. The two first limiting surfaces are paired with the two first side surfaces one-to-one. The inner wall of the second notch 514a has an orthogonal second side surface and a second end surface, that is, the second side surface and the second end surface are perpendicularly connected. The second side surface is located in the arrangement direction of the two second notches 514a, and the second end surface is located in the length direction of the piston pin body 510. The inner wall of the second groove includes two opposing second limiting surfaces and a fourth arc surface 524, which connects the two opposing second limiting surfaces. The two second limiting surfaces are paired with the two second side surfaces one-to-one. The first side surface, the second side surface, the first limiting surface, and the second limiting surface are all parallel to the inclined plane. This makes it easier for the piston pin body 510 to tilt in the inclined plane.

[0065] In this embodiment, the plane defined by the movement direction of the piston 310 and the center line of the piston pin hole 312 is parallel to the inclined plane. That is, in this embodiment, the plane defined by the center line of the piston 310's mounting / dismounting port 314 and the center line of the piston pin hole 312 is parallel to the inclined plane. Thus,

[0066] In this embodiment, the first arc surface 512 can be completely contained within the third arc surface 522, meaning that at a certain position, the edge of the first arc surface 512 coincides with the edge of the third arc surface 522, or the edge of the first arc surface 512 is located inside the edge of the third arc surface 522. The second arc surface 514 can be completely contained within the fourth arc surface 524, meaning that at a certain position, the edge of the second arc surface 514 coincides with the edge of the third arc surface 522, or the edge of the second arc surface 514 is located inside the edge of the fourth arc surface 524. This facilitates the fixing block 520 in limiting the piston pin body 510. It can be understood that in other embodiments, at a certain position, the edge of the first arc surface 512 may be located outside the edge of the third arc surface 522, and / or the edge of the second arc surface 514 may be located outside the edge of the fourth arc surface 524.

[0067] In this embodiment, the first arc surface 512 and the second arc surface 514 are symmetrically arranged, and the axis of symmetry of the first arc surface 512 and the second arc surface 514 is perpendicular to the center line of the piston pin body 510. Thus, when installing the piston pin body 510, it is not necessary to distinguish the assembly direction of the piston pin body 510, which facilitates assembly and improves the assembly efficiency and production efficiency of the compressor.

[0068] In this embodiment, in the compressor 10, the first arc surface 512 and the third arc surface 522 are in clearance fit, and the second arc surface 514 and the fourth arc surface 524 are in clearance fit. This reduces friction.

[0069] In this embodiment, the piston pin body 510 has an axial through hole 516 extending along its axial direction. The fixing block 520 has an axial channel 526 extending along its axial direction. When the fixing block 520 limits the piston pin body 510, the axial channel 526 communicates with the axial through hole 516. Thus, when the compressor is working, lubricating oil can enter the axial through hole 516 through the axial channel 526, and the lubricating oil can flow in the oil passage formed by the axial through hole 516 and the axial channel 526. This allows the lubricating oil to lubricate the first arc surface 512 and the third arc surface 522, as well as the second arc surface 514 and the fourth arc surface 524, which is very convenient for lubricating oil to lubricate the junction between the piston pin body 510 and the fixing block 520. Specifically, in this embodiment, the inner diameter of the axial channel 526 is larger than the inner diameter of the axial through hole 516. This further facilitates the entry of lubricating oil into the axial through hole 516 through the axial channel 526.

[0070] In this embodiment, an oil groove 518 extending circumferentially is provided on the outer side wall of the piston pin body 510. An oil passage hole 519 communicating with the axial through hole 516 is provided on the bottom wall of the oil groove 518. Thus, when the compressor is operating, lubricating oil can enter the axial through hole 516 through the axial channel 526, and then enter the oil groove 518 through the oil passage hole 519, thereby lubricating the outer wall of the piston pin body 510 and the inner wall of the mounting hole 410 of the connecting rod 400.

[0071] In this embodiment, the center point of the first arc surface 512 and the center point of the second arc surface 514 are both located on the center line of the axial through hole 516. Furthermore, in this embodiment, the center line of the axial through hole 516 approximately coincides with the center line of the piston pin body 510.

[0072] In this embodiment, the oil groove 518 extends circumferentially around the piston pin body 510, that is, the oil groove 518 is annular. This facilitates 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 is understood that in other embodiments, the oil groove 518 may also be arc-shaped. For example, the central angle corresponding to the arc-shaped oil groove 518 may be 30°, 60°, 120°, 150°, etc.

[0073] In this embodiment, the oil passage 519 extends radially along the piston pin body 510. Thus, compared to an inclined extension, the radial extension of the oil passage 519 along the piston pin body 510 allows for a shorter length of the oil passage 519, thereby facilitating the flow of lubricating oil.

[0074] In this embodiment, the first arc surface 512 and the second arc 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 approximately located in the middle of the plug body 510, which is more conducive to the uniform lubrication of the lubricating oil. It can be understood that in other embodiments, the oil groove 518 and the oil passage 519 may also be located at the end of the plug body 510, or between the end and the middle of the plug body 510.

[0075] In this embodiment, the center point of the third arc surface 522 or the center point of the fourth arc surface 524 is on the center line of the axial channel 526. Specifically, in this embodiment, the center line of the axial channel 526 roughly coincides with the center line of the fixing block 520.

[0076] In this embodiment, the end face of the fixing block 520 away from the piston pin body 510 is a plane.

[0077] In this embodiment, as Figure 2 and Figures 8-10 As shown, the piston pin assembly 500 also includes a fixing member 530. The fixing block 520 is fixedly connected to the piston 310 via the fixing member 530. Specifically, in this embodiment, the fixing block 520 has a fixing hole 528, which extends through both opposite sides of the fixing 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. The fixing member 530 is sequentially inserted into 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 bonded to an adhesive layer; in this case, the fixing member 530 is located between the inner wall of the piston pin hole 312 and the outer wall of the fixing block 520. It can also be understood that in other embodiments, the fixing member 530 can be omitted; in this case, the fixing block 520 can be fixed to the inner wall of the piston pin hole 312 by welding.

[0078] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

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 outer diameter of the piston pin body is smaller than the inner diameter of the piston pin hole, so that the center line of the piston pin body can be inclined relative to the center line 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 on the piston 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 body and define the inclined plane of the center line of the piston pin body; One end of the piston pin body has a first protrusion, the other end has a second protrusion, one of the fixing blocks has a first groove, and the other fixing block or the inner wall of the piston pin hole has a second groove; The first protrusion can slide in the first groove, and the second protrusion can slide in the second groove, and the inclined plane is determined by the sliding directions of the first protrusion and the second protrusion; One end of the piston pin body has two oppositely arranged first notches, the other end has two oppositely arranged second notches, the two second notches are arranged one-to-one with the two first notches, the two first notches define the first protrusion, and the two second notches define the second protrusion, the inner wall of the first notch has a first side surface, and the inner wall of the second notch has a second side surface; The inner wall of the first groove further includes two oppositely arranged first limiting surfaces, the two first limiting surfaces are arranged one-to-one with the first side surfaces of the two first notches respectively, and the inner wall of the second groove further includes two oppositely arranged second limiting surfaces, the two second limiting surfaces are arranged one-to-one with the second side surfaces of the two second notches respectively; The first side surface, the second side surface, the first limiting surface and the second limiting surface are parallel to the inclined plane. The maximum angle of inclination of the center line of the piston pin body relative to the center line of the piston pin hole is 5°-15°. The first protrusion has an outward convex first curved surface, the second protrusion has an outward convex second curved surface, the inner wall of the first groove has a third curved surface slidingly matched with the first curved surface, and the second groove has a fourth curved surface slidingly matched with the second curved surface.

2. The piston connecting rod arrangement of claim 1 wherein, The plane determined by the movement direction of the piston and the center line of the piston pin hole is parallel to the inclined plane.

3. 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 is clearance-fitted with the mounting hole.

4. The piston connecting rod arrangement of any one of claims 1-3, wherein, The piston pin body has an axial through hole penetrating through the piston pin body in the axial direction, and the fixing block has an axial channel penetrating through the fixing block in the axial direction, the axial channel communicates with the axial through hole.

5. 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.

6. The piston connecting rod arrangement of claim 1 wherein, And / or, 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.

7. The piston connecting rod arrangement of claim 6 wherein, The end of the piston pin body is clearance-fitted with the fixing block or the inner wall of the piston pin hole. ​ 8. The piston connecting rod arrangement of claim 1 wherein, ​ 9. The piston connecting rod arrangement as described in claim 1, wherein, The piston pin assembly further includes a fastener connecting the retainer block to the piston.

10. A compressor characterized by, A piston connecting rod arrangement comprising a piston as claimed in any one of claims 1-9.

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