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 assembly and a connecting rod assembly; the piston assembly is provided with a containing groove in the piston assembly, and the containing groove extends along the circumference of the piston assembly; the connecting rod assembly comprises a piston pin and a connecting rod provided with a connecting end; the piston pin is connected with the connecting end; two ends of the piston pin are limited in the containing groove, and the two ends of the piston pin can slide in the containing groove. The piston connecting rod device can reduce the perpendicularity requirement between the crankcase cylinder and the bearing, reduce the machining difficulty and machining cost of the parts such as the crankcase cylinder and the bearing, and improve the performance of the compressor.

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 piston and connecting rod are directly connected by a piston pin. This method allows the piston to move only in the length direction perpendicular to the piston pin, which requires a high degree of perpendicularity between the crankcase cylinder and the bearing. This increases the difficulty and cost of machining components such as the crankcase cylinder and the bearing. Moreover, this structure results in severe wear between the piston and the cylinder, between the piston pin and the small end of the connecting rod, and between the large end of the connecting rod and the crankshaft crank during operation, affecting the performance and reliability of the compressor. Summary of the Invention

[0003] The main objective of this invention is to provide a piston connecting rod device that aims to reduce the perpendicularity requirement between the crankcase cylinder and the bearing, reduce the processing difficulty and cost of crankcase cylinder, bearing and other components, and improve the performance of the compressor.

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

[0005] A piston assembly having a receiving groove located within the piston assembly, the receiving groove extending circumferentially along the piston assembly; and

[0006] A connecting rod assembly includes a piston pin and a connecting rod having a connecting end, the piston pin being connected to the connecting end, both ends of the piston pin being confined within a receiving groove, and both ends of the piston pin being slidable within the receiving groove.

[0007] In one embodiment, the central angle corresponding to the receiving groove is greater than 180° and less than or equal to 360°.

[0008] In one embodiment, the piston assembly includes a piston and a fixing block. The piston is a hollow structure with one end open and the other end closed. The connecting end is located inside the piston. The piston has a mounting hole in its circumferential direction. The fixing block is disposed in the mounting hole. A first groove is formed on the inner wall surface of the piston. A second groove is formed on the inner end surface of the fixing block. The receiving groove includes the first groove and the second groove. The outer diameter of the piston pin is smaller than the inner diameter of the mounting hole.

[0009] In one embodiment, the outer diameter of the fixing block is larger than the outer diameter of the piston pin.

[0010] In one embodiment, the connecting end has a mounting hole, the piston pin is disposed in the mounting hole, and the inner diameter of the mounting hole is smaller than the inner diameter of the assembly hole.

[0011] In one embodiment, the inner end face of the fixing block is located inside the inner wall surface of the piston or flush with the inner wall surface of the piston; and / or

[0012] The outer end face of the fixing block is located inside the outer wall of the piston or flush with the outer wall of the piston;

[0013] In one embodiment, the inner end face of the fixing block also has two notches, which are located on opposite sides of the receiving groove, so that the inner end face of the fixing block is located inside the inner wall of the piston or flush with the inner wall of the piston.

[0014] In one embodiment, a fixing member is further included to connect the fixing block and the piston, the fixing member extending along the direction in which the two notches are arranged.

[0015] In one embodiment, the piston has a circular through hole at its open end, and the connecting end enters and exits the piston through the circular through hole. The length of the piston pin is greater than the diameter of the circular through hole.

[0016] In one embodiment, the piston pin has an axial through hole extending along its axial direction, the piston assembly has an oil hole extending radially, and the oil hole communicates with the axial through hole when both ends of the piston pin are confined within the receiving groove.

[0017] In one embodiment, the inner diameter of the oil hole is larger than the inner diameter of the axial through hole; and / or

[0018] The piston assembly has several oil hole groups, each oil hole group including two oil holes facing each other, and the two oil holes of the oil hole group are connected through the axial through hole.

[0019] In one embodiment, the inner wall of the receiving groove has a concave first spherical surface, and both ends of the piston pin have convex second spherical surfaces, the second spherical surfaces slidingly engaging with the first spherical surface.

[0020] The present invention also proposes a compressor including the piston connecting rod device described above.

[0021] In the aforementioned piston-connecting rod assembly, both ends of the piston pin are confined within the receiving groove, thus enabling the connection between the connecting rod and the piston assembly. Simultaneously, the two ends of the piston pin can slide within the receiving groove, allowing the piston assembly's movement direction to be not limited to being perpendicular to the length direction of the piston pin. Once the position of the piston pin is determined, the piston assembly slides relative to the piston pin through the receiving groove, allowing the piston assembly to have multiple different positions relative to the connecting rod assembly. Therefore, when assembling the piston assembly and connecting rod assembly, if machining or assembly errors prevent the piston assembly and connecting rod assembly from being assembled in the preset positions, adjusting the position of the piston assembly allows for proper assembly between the piston assembly and connecting rod assembly. This reduces the perpendicularity requirements between the cylinder and bearing (the compressor crankshaft passes through the bearing), lowering the machining difficulty and cost of components such as the cylinder and bearing. Furthermore, after the piston assembly and connecting rod assembly are assembled to form the piston-connecting rod assembly, the sliding capability of the piston pin within the receiving groove improves the flexibility of the connecting rod assembly's movement, enhances the overall flexibility of the piston-connecting rod assembly, and thus improves its applicability. When the aforementioned piston-connecting rod assembly is applied in a compressor, it can reduce wear between the piston assembly and the cylinder, between the piston assembly and the connecting rod assembly, and between the connecting rod assembly and the crankshaft, resulting in better lubrication and improved compressor performance. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a three-dimensional structural diagram of a piston connecting rod device according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A cross-sectional view of the piston-connecting rod assembly shown;

[0025] Figure 3 for Figure 1 Another cross-sectional view of the piston-connecting rod assembly shown;

[0026] Figure 4 for Figure 1 A three-dimensional structural diagram of the piston in the piston-connecting rod assembly shown;

[0027] Figure 5 for Figure 4 A cross-sectional view of the piston shown;

[0028] Figure 6for Figure 4 Another cross-sectional view of the piston shown;

[0029] Figure 7 for Figure 1 A three-dimensional structural diagram of the fixing block of the piston connecting rod device shown;

[0030] Figure 8 for Figure 7 A cross-sectional view of the fixing block shown;

[0031] Figure 9 for Figure 7 Another cross-sectional view of the fixing block shown;

[0032] Figure 10 for Figure 1 A three-dimensional structural diagram of the piston pin in the piston-connecting rod assembly shown.

[0033] Figure 11 for Figure 10 The image shows a cross-sectional view of the piston pin.

[0034] Explanation of icon numbers:

[0035] 10 Piston connecting rod assembly 200 Piston assembly 300 Linkage assembly 202 Container 310 Piston pin 320 link 322 Connection end 324 Installation end 210 piston 220 Fixed block 204 Assembly holes 212 First groove 222 Second groove 220a inner end face of the fixed block 210a Piston inner wall surface 224 gap 400 Fasteners 226 Fixing hole 206 Connecting through hole 207 Connecting blind holes 322a Mounting holes 208 Piston opening end 2022 First sphere 212a first inner wall surface 222a second inner wall surface 312 Second sphere 209 Oil hole 314 Axial through hole 228 Axial channel 316 oil tank 318 Oil passage

[0036] 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

[0037] 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.

[0038] 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.

[0039] 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.

[0040] This invention proposes a piston connecting rod device.

[0041] In embodiments of the present invention, such as Figures 1-3 As shown, the piston-connecting rod assembly 10 includes a piston assembly 200 and a connecting rod assembly 300. The inner wall of the piston assembly 200 has a receiving groove 202 extending circumferentially along the piston assembly 200. The connecting rod assembly 300 includes a piston pin 310 and a connecting rod 320. The connecting rod 320 has a connecting end 322 (small end) and a mounting end 324 (large end). The piston pin 310 is connected to the connecting end 322 of the connecting rod 320. Both ends of the piston pin 310 are confined within the receiving groove 202. This allows for the connection between the connecting rod 320 and the piston assembly 200. When the piston-connecting rod assembly 10 is applied to a compressor, the mounting end 324 of the connecting rod 320 is connected to the compressor's crankshaft. When the compressor's motor or other drive mechanism drives the crankshaft to rotate, the crankshaft can drive the piston assembly 200 to reciprocate within the compressor's cylinder via the connecting rod assembly 300.

[0042] In this embodiment, both ends of the piston pin 310 can slide within the receiving groove 202. This allows the piston assembly 200 to move in a direction not limited to the length direction perpendicular to the piston pin 310. Once the position of the piston pin 310 is determined, the piston assembly 200 slides relative to the piston pin 310 through the receiving groove 202, allowing the piston assembly 200 to have multiple different positions relative to the connecting rod assembly 300. Therefore, when assembling the piston assembly 200 and the connecting rod assembly 300, if machining errors or assembly errors prevent the piston assembly 200 and the connecting rod assembly 300 from being assembled in a preset position, adjusting the position of the piston assembly 200 can achieve the desired assembly. This reduces the perpendicularity requirement between the cylinder and the bearing (the compressor crankshaft passes through the bearing), lowering the machining difficulty and cost of components such as the cylinder and bearing.

[0043] Furthermore, after the piston assembly 200 and connecting rod assembly 300 are assembled to form the piston-connecting rod device 10, the two ends of the piston pin 310 can slide within the receiving groove 202, which improves the flexibility of the connecting rod assembly 300's movement, enhances the overall flexibility of the piston-connecting rod device 10, and thus improves its applicability. When the aforementioned piston-connecting rod device 10 is applied in a compressor, it can reduce wear between the piston assembly 200 and the cylinder, between the piston assembly 200 and the connecting rod assembly 300, and between the connecting rod assembly 300 and the crankshaft, providing better lubrication and improving the compressor's performance.

[0044] It should be noted that in this embodiment, the two ends of the piston pin 310 are confined within the receiving groove 202, meaning that the angle at which the receiving groove 202 extends circumferentially along the piston assembly 200 is greater than 180°. In other words, the receiving groove 202 is arc-shaped or annular, and the central angle corresponding to the receiving groove 202 is greater than 180°. Specifically, in this embodiment, the angle at which the receiving groove 202 extends circumferentially along the piston assembly 200 is 360°, meaning that in this embodiment, the receiving groove 202 is annular, forming an annular groove. At this point, it can be considered that the piston assembly 200 can rotate within 360° relative to the piston pin 310. This facilitates the assembly between the piston assembly 200 and the connecting rod assembly 300 by adjusting the position of the piston assembly 200, thereby further reducing the perpendicularity requirements between the cylinder and the bearing, and further reducing the processing difficulty and cost of components such as the cylinder and bearing. It is understood that in other embodiments, the angle at which the receiving groove 202 extends circumferentially along the piston assembly 200 may also be 240°, 270°, 300°, 330°, etc.

[0045] In this embodiment, as Figures 1-9As shown, the piston assembly 200 includes a piston 210 and a fixing block 220. The piston 210 is a hollow structure with one end open and the other closed, and the connecting end 322 of the connecting rod 320 is located inside the piston 210. A mounting hole 204 is provided on the circumference of the piston 210. The fixing block 220 is disposed within the mounting hole 204. A first groove 212 is provided on the inner wall surface of the piston 210. A second groove 222 is provided on the inner end face 220a of the fixing block 220. The receiving groove 202 includes the first groove 212 and the second groove 222. That is, in this embodiment, a portion of the receiving groove 202 is located on the piston 210, and another portion is located on the fixing block 220. The outer diameter of the piston pin 310 is smaller than the inner diameter of the mounting hole 204. Thus, the piston pin 310 can be mounted inside the piston 210 through the mounting hole 204, which is very convenient for mounting the piston pin 310. It is understood that in other embodiments, the piston 210 can be formed by splicing two piston blocks. In this case, the piston pin 310 and connecting rod 320 can be assembled on one piston block first, and then another piston block can be assembled on the same piston block. In this case, the fixing block 220 and the assembly hole 204 can be omitted, and the receiving groove 202 can be completely located on the piston 210.

[0046] In this embodiment, the outer diameter of the fixing block 220 matches the inner diameter of the mounting hole 204; that is, the outer diameter of the fixing block 220 is equal to, slightly less than, or slightly equal to the inner diameter of the mounting hole 204. This facilitates the fixed connection between the fixing block 220 and the piston 210. Specifically, in this embodiment, the fixing block 220 can be clearance-fitted with the mounting hole 204; that is, the outer diameter of the fixing block 220 is slightly smaller than the inner diameter of the mounting hole 204. This facilitates the assembly of the fixing block 220.

[0047] In this embodiment, the outer diameter of the fixing block 220 is larger than the outer diameter of the piston pin 310. This makes it easier to assemble the piston pin 310 through the mounting hole 204 of the fixing block 220.

[0048] In this embodiment, the inner end face 220a of the fixing block 220 does not protrude beyond the inner wall surface 210a of the piston 210. That is, the inner end face 220a of the fixing block 220 is located inside the inner wall surface 210a of the piston 210, or the inner end face 220a of the fixing block 220 is flush with the inner wall surface 210a of the piston 210. In this way, the internal space of the piston 210 can be maximized, and when adjusting the relative position of the piston assembly 200 and the connecting rod assembly 300, the fixing block 220 can be prevented from interfering with the adjustment of the relative position of the piston assembly 200 and the connecting rod assembly 300.

[0049] Specifically, in this embodiment, the inner end face 220a of the fixing block 220 is provided with two notches 224, which are located on opposite sides of the receiving groove 202 (second groove 222) to prevent the fixing block 220 from protruding beyond the inner wall surface 210a of the piston 210 on opposite sides of the receiving groove 202. That is, the inner end face 220a of the fixing block 220 is located inside the inner wall surface 210a of the piston 210 or flush with the inner wall surface 210a of the piston 210. In this way, the fixing block 220 can be effectively prevented from interfering with the position adjustment of the piston 210.

[0050] In this embodiment, as Figures 1-9 As shown, the piston connecting rod device 10 also includes a fixing member 400, and the fixing block 220 is fixedly connected to the piston 210 through the fixing member 400. Specifically, in this embodiment, the fixing member 400 extends along the direction of the two notches 224. This makes it easier to install the fixing member 400. More specifically, in this embodiment, the fixing block 220 has a fixing hole 226, which penetrates through opposite sides of the fixing block 220. The inner wall of the assembly hole 204 has a connecting through hole 206 and a connecting blind hole 207. The connecting through hole 206 corresponds to one end of the fixing hole 226, and the connecting blind hole 207 corresponds to the other end of the fixing hole 226. The fixing member 400 is sequentially inserted through the connecting through hole 206, the fixing hole 226, and the connecting blind hole 207. It can be understood that in other embodiments, the fixing member 400 can be bonded to an adhesive layer. In this case, the fixing member 400 is located between the inner wall of the assembly hole 204 and the outer wall of the fixing block 220. It is understood that in other embodiments, the fastener 400 may be omitted. In this case, the fastener 220 may be fixed to the inner wall of the assembly hole 204 by welding.

[0051] In this embodiment, the connecting end 322 of the connecting rod 320 is located within the piston assembly 200. The connecting end 322 of the connecting rod 320 has a mounting hole 322a. The piston pin 310 is inserted into the mounting hole 322a. This facilitates the connection between the piston pin 310 and the connecting end 322 of the connecting rod 320. It is understood that in other embodiments, welding or other methods can also be used to connect the outer surface of the connecting rod 320 to the piston pin 310.

[0052] In this embodiment, the outer diameter of the piston pin 310 matches the inner diameter of the mounting hole 322a, that is, the outer diameter of the piston pin 310 is equal to, slightly less than, or slightly equal to the inner diameter of the mounting hole 322a. This facilitates a more secure connection between the piston pin 310 and the connecting end 322 of the connecting rod 320. Specifically, in this embodiment, the piston pin 310 can have a clearance fit with the mounting hole 322a, that is, the outer diameter of the piston pin 310 is slightly smaller than the inner diameter of the mounting hole 322a. This facilitates the assembly of the piston pin 310 onto the connecting end 322 of the connecting rod 320.

[0053] In this embodiment, the inner diameter of the mounting hole 322a is smaller than the inner diameter of the assembly hole 204. It should be noted that in related technologies, the inner diameters of the mounting hole 322a, the assembly hole 204, and the outer diameter of the piston pin 310 are approximately the same. When the mounting hole 322a and the assembly hole 204 cannot be aligned due to machining errors or assembly errors, the piston pin 310 cannot be inserted into the mounting hole 322a through the assembly hole 204, resulting in the piston pin 310 not being able to be assembled. However, in this embodiment, the inner diameter of the mounting hole 322a is smaller than the inner diameter of the assembly hole 204. Thus, even when the mounting hole 322a and the assembly hole 204 cannot be aligned due to machining errors or assembly errors, and there is a certain amount of misalignment, the piston pin 310 can still be inserted into the mounting hole 322a through the assembly hole 204. This facilitates the assembly of the piston pin 310 with the connecting end 322 of the connecting rod 320 and the piston 210.

[0054] In this embodiment, the piston pin 310 enters and exits the piston 210 through the mounting hole 204. The connecting end 322 of the connecting rod 320 enters and exits the piston 210 through the opening end 208 of the piston 210. The length of the piston pin 310 is greater than the diameter of the opening end 208 of the piston 210. This prevents the piston pin 310 from dislodging from the opening end 208 of the piston 210. Specifically, in this embodiment, the opening end 208 of the piston 210 has a circular through hole for the connecting rod 320 to enter and exit the piston 210; that is, the length between any two directly opposite points of the opening end 208 of the piston 210 is the same, and the opening width of the opening end 208 of the piston 210 is the same everywhere. Thus, when the position of the piston assembly 200 relative to the connecting rod assembly 300 changes, the piston pin 310 can also be prevented from dislodging from the opening end 208 of the piston 210.

[0055] In this embodiment, as Figures 1-3 , Figure 10 and Figure 11 As shown, the inner wall of the receiving groove 202 has a concave first spherical surface 2022. Specifically, in this embodiment, as... Figures 1-9 As shown, the receiving groove 202 includes a first groove 212 located on the piston 210 and a second groove 222 located on the fixing block 220. The inner wall surface of the first groove 212 includes a first inner wall surface 212a, and the inner wall surface of the second groove 222 includes a second inner wall surface 222a. The first spherical surface 2022 includes a first inner wall surface 212a and a second inner wall surface 222a. That is, both the first inner wall surface 212a and the second inner wall surface 222a are spherical surfaces. Both ends of the piston pin 310 have outwardly protruding second spherical surfaces 312, which slide in conjunction with the first spherical surfaces 2022. This facilitates the sliding of both ends of the piston pin 310 within the receiving groove 202.

[0056] In this embodiment, the second spherical surface 312 can be completely contained within the first spherical surface 2022. That is, at a certain position, the edge of the second spherical surface 312 coincides with the edge of the first spherical surface 2022, or the edge of the second spherical surface 312 is located inside the edge of the first spherical surface 2022. This facilitates the limiting of the piston pin 310 by the receiving groove 202. It can be understood that in other embodiments, the edge of the second spherical surface 312 may be located outside the edge of the first spherical surface 2022.

[0057] In this embodiment, the two second spherical surfaces 312 of the piston pin 310 are symmetrically arranged, and the axis of symmetry of the two second spherical surfaces 312 of the piston pin 310 is perpendicular to the center line of the piston pin 310. Thus, when installing the piston pin 310, it is not necessary to distinguish the assembly direction of the piston pin 310, which facilitates assembly and improves the assembly efficiency and production efficiency of the compressor.

[0058] In this embodiment, in the piston-connecting rod assembly 10, the second spherical surface 312 and the first spherical surface 2022 are in clearance fit. This reduces friction.

[0059] In this embodiment, as Figures 1-11 As shown, the piston pin 310 has an axial through-hole 314 extending along its axial direction. The piston assembly 200 has an oil hole 209 extending radially. When both ends of the piston pin 310 are confined within the receiving groove 202, the oil hole 209 communicates with the axial through-hole 314. Thus, when the compressor is operating, lubricating oil can enter the axial through-hole 314 through the oil hole 209, and the lubricating oil can flow in the oil passage formed by the axial through-hole 314 and the oil hole 209, thereby lubricating the second spherical surface 312 and the first spherical surface 2022, which is very convenient for lubricating oil to lubricate the piston pin 310 and the inner wall of the receiving groove 202. Specifically, in this embodiment, the inner diameter of the oil hole 209 is larger than the inner diameter of the axial through-hole 314. This further facilitates the entry of lubricating oil into the axial through-hole 314 through the oil hole 209.

[0060] In this embodiment, there are multiple oil holes 209, which are arranged at intervals along the circumference of the piston assembly 200. In this way, when the position of the piston assembly 200 changes, the axial through hole 314 of the piston pin 310 can communicate with the oil holes 209 at different positions.

[0061] In this embodiment, the piston assembly 200 has several oil hole groups, each oil hole group including two oil holes 209 facing each other. The two oil holes 209 of the oil hole group can communicate through the axial through hole 314 of the piston pin 310. At this time, the two oil holes 209 of the oil hole group and the axial through hole 314 of the piston pin 310 form an oil passage, which is more conducive to lubricating the two ends of the piston pin 310 and the inner wall of the receiving groove 202. Specifically, in this embodiment, the fixing block 220 has an axial channel 228 that runs through it along its axial direction, and the axial channel 228 is one oil hole 209.

[0062] In this embodiment, an oil groove 316 extending circumferentially is provided on the outer side wall of the piston pin 310. An oil passage hole 318 communicating with the axial through hole 314 is provided on the bottom wall of the oil groove 316. Thus, when the compressor is operating, lubricating oil can enter the axial through hole 314 through the oil hole 209, and then enter the oil groove 316 through the oil passage hole 318, thereby lubricating the outer wall of the piston pin 310 and the inner wall of the mounting hole 322a of the connecting rod 320.

[0063] In this embodiment, the center points of the two second spherical surfaces 312 of the piston pin 310 are both located on the center line of the axial through hole 314. Specifically, in this embodiment, the center line of the axial through hole 314 roughly coincides with the center line of the piston pin 310.

[0064] In this embodiment, the oil groove 316 extends circumferentially around the piston pin 310, meaning the oil groove 316 is annular. This facilitates lubrication of the outer wall of the piston pin 310 and the inner wall of the mounting hole 322a of the connecting rod 320 by the lubricating oil. It is understood that in other embodiments, the oil groove 316 may also be arc-shaped; for example, the central angle of an arc-shaped oil groove 316 could be 30°, 60°, 120°, 150°, etc.

[0065] In this embodiment, the oil passage 318 extends radially along the piston pin 310. Thus, compared to an inclined extension, the radial extension of the oil passage 318 along the piston pin 310 allows for a shorter length of the oil passage 318, thereby facilitating the flow of lubricating oil.

[0066] In this embodiment, the two second spherical surfaces 312 of the piston pin 310 are symmetrically arranged about the center line of the oil passage 318. That is, the oil groove 316 and the oil passage 318 are approximately located in the middle of the piston pin 310, which is more conducive to the uniform lubrication of the lubricating oil. It can be understood that in other embodiments, the oil groove 316 and the oil passage 318 may also be located at the end of the piston pin 310, or between the end and the middle of the piston pin 310.

[0067] In this embodiment, the center point of the first spherical surface 2022 on the fixing block 220 (the center point of the second inner wall surface 222a) is located on the center line of the axial channel 228. Specifically, in this embodiment, the center line of the axial channel 228 roughly coincides with the center line of the fixing block 220.

[0068] In this embodiment, the end face (outer end face) of the fixing block 220 away from the piston pin 310 does not protrude beyond the outer wall surface of the piston 210. That is, the end face (outer end face) of the fixing block 220 away from the piston pin 310 is located inside the outer wall surface of the piston 210, or the end face (outer end face) of the fixing block 220 away from the piston pin 310 is flush with the outer wall surface of the piston 210. This avoids the fixing block 220 protruding beyond the outer wall surface of the piston 210 and interfering with other components. Specifically, in this embodiment, the end face of the fixing block 220 away from the piston pin 310 is an arc surface. This allows the end face of the fixing block 220 away from the piston pin 310 to match the outer wall surface of the piston 210, since the outer wall surface of the piston 210 is typically an arc surface.

[0069] The present invention also proposes a compressor, which includes the piston connecting rod device 10 described above. The specific structure of the piston connecting rod device 10 is as described in the above embodiments. Since the compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0070] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any 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 device, characterized in that, include: A piston assembly having a receiving groove located within the piston assembly, the receiving groove extending circumferentially along the piston assembly; as well as A connecting rod assembly includes a piston pin and a connecting rod with a connecting end. The piston pin is connected to the connecting end, and both ends of the piston pin are confined within a receiving groove, and both ends of the piston pin can slide within the receiving groove, so that the piston assembly has multiple different positions relative to the connecting rod assembly. The central angle corresponding to the receiving groove is greater than 180° and less than or equal to 360°. The piston assembly includes a piston and a fixing block. The piston is a hollow structure with one open end and one closed end. The connecting end is located inside the piston. The piston has a mounting hole in its circumferential direction. The fixing block is disposed in the mounting hole. A first groove is formed on the inner wall surface of the piston, and a second groove is formed on the inner end surface of the fixing block. The receiving groove includes the first groove and the second groove. The outer diameter of the piston pin is smaller than the inner diameter of the mounting hole.

2. The piston connecting rod device as described in claim 1, characterized in that, The outer diameter of the fixing block is larger than the outer diameter of the piston pin.

3. The piston connecting rod device as described in claim 1, characterized in that, The connecting end has a mounting hole, and the piston pin is disposed in the mounting hole. The inner diameter of the mounting hole is smaller than the inner diameter of the assembly hole.

4. The piston connecting rod device as described in claim 1, characterized in that, The inner end face of the fixing block is located inside the inner wall surface of the piston or flush with the inner wall surface of the piston; and / or The outer end face of the fixing block is located inside the outer wall of the piston or flush with the outer wall of the piston.

5. The piston connecting rod device as described in claim 1, characterized in that, The inner end face of the fixing block also has two notches, which are located on opposite sides of the receiving groove, so that the inner end face of the fixing block is located inside the inner wall of the piston or flush with the inner wall of the piston.

6. The piston connecting rod device as described in claim 5, characterized in that, It also includes a fixing member that connects the fixing block and the piston, the fixing member extending along the direction of the two notches.

7. The piston connecting rod device as described in claim 1, characterized in that, The piston has a circular through hole at its open end, and the connecting end enters and exits the piston through the circular through hole. The length of the piston pin is greater than the diameter of the circular through hole.

8. The piston connecting rod device as described in claim 1, characterized in that, The piston pin has an axial through hole extending along its axial direction, and the piston assembly has an oil hole extending radially. When both ends of the piston pin are confined within the receiving groove, the oil hole communicates with the axial through hole.

9. The piston connecting rod device as described in claim 8, characterized in that, The inner diameter of the oil hole is larger than the inner diameter of the axial through hole; and / or The piston assembly has several oil hole groups, each oil hole group including two oil holes facing each other, and the two oil holes of the oil hole group are connected through the axial through hole.

10. The piston connecting rod device according to any one of claims 1-9, characterized in that, The inner wall of the receiving groove has a concave first spherical surface, and both ends of the piston pin have convex second spherical surfaces, which slide in conjunction with the first spherical surface.

11. A compressor, characterized in that, Includes the piston connecting rod assembly as described in any one of claims 1-10.

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