Connecting rods, reciprocating compressors, refrigeration equipment and connecting rod assemblies

Abstract

The present invention discloses a connecting rod, a reciprocating compressor, a refrigeration device, and a connecting rod assembly. The connecting rod includes a first rod body and a second rod body. The first rod body includes a first shaft and a first head provided at one end of the first shaft, and the other end of the first shaft has a first shrink fit structure. The second rod body includes a second shaft and a second head provided at one end of the second shaft, and the other end of the second shaft has a second shrink fit structure. In the length direction of the connecting rod, the first shrink fit structure and the second shrink fit structure have multiple shrink fit positions, and the first head and the second head have multiple center distances corresponding to the multiple shrink fit positions. The first shrink fit structure and the second shrink fit structure are shrink fit matched at the corresponding shrink fit positions to limit the center distance between the first head and the second head to the center distance of the corresponding shrink fit positions. The center distance at both ends of the connecting rod is adjustable, and the structure of the connecting rod is relatively simple.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a connecting rod, a reciprocating compressor, a refrigeration device and a connecting rod assembly. Background Art

[0002] The connecting rod is the most important moving component in a reciprocating compressor. Its large end connects to the crankshaft, and its small end connects to the piston, fulfilling the crucial function of driving the reciprocating motion of the piston by the crankshaft. In related art, structural design allows for an adjustable center-to-center distance between the large and small ends of the connecting rod, thereby meeting the requirements of different compressor stroke volumes and corresponding cooling capacities, resulting in excellent versatility. Specifically, the connecting rod comprises a separate large-end structure, a small-end structure, and a fixing. During assembly, when the connecting rod needs to meet the compressor's first stroke and corresponding cooling capacity requirements, the positions of the large and small end structures are adjusted so that the center-to-center distance between the large and small ends reaches a first distance, and then the fixing is used to secure the large and small end structures. When the connecting rod needs to meet the compressor's second stroke and corresponding cooling capacity requirements, the positions of the large and small end structures are adjusted so that the center-to-center distance between the large and small ends reaches a second distance, and then the fixing is used to secure the large and small end structures. Although the connecting rods in related art can achieve an adjustable center-to-center distance between the large and small ends, the large and small end structures have a large number of components, resulting in a complex connection structure. Summary of the Invention

[0003] The main purpose of the present invention is to provide a connecting rod, which aims to achieve adjustable center distances at both ends of the connecting rod while simplifying the structure of the connecting rod.

[0004] To achieve the above-mentioned object, the connecting rod proposed by the present invention comprises:

[0005] A first rod body comprises a first rod shaft and a first head portion provided at one end of the first rod shaft, wherein the other end of the first rod shaft has a first shrink fit structure; and

[0006] The second rod body comprises a second rod shaft and a second head portion provided at one end of the second rod shaft, wherein the other end of the second rod shaft has a second shrink fit structure;

[0007] In the length direction of the connecting rod, the first shrink fit structure and the second shrink fit structure have multiple shrink fit positions, the first head and the second head have multiple center distances corresponding to the multiple shrink fit positions, and the first shrink fit structure and the second shrink fit structure are shrink fit at the corresponding shrink fit positions to limit the center distance between the first head and the second head to the center distance corresponding to the shrink fit positions.

[0008] In one embodiment, the first heat shrinkable sleeve structure has heat shrinkable sleeve columns, and the second heat shrinkable sleeve structure has heat shrinkable sleeve grooves. At least one of the heat shrinkable sleeve columns and the heat shrinkable sleeve grooves is in plurality and arranged at intervals along the length direction of the connecting rod.

[0009] The connecting rod has at least one shrink fit portion, and the shrink fit portion includes a shrink fit column and a shrink fit groove.

[0010] In one embodiment, at least one of the thermal jacket columns and the thermal jacket slots is greater than or equal to four.

[0011] In one embodiment, the number of the thermal jacket columns is the same as the number of the thermal jacket slots; and / or

[0012] The number of the heat-shrink sleeve parts is greater than or equal to two.

[0013] In one embodiment, the first rod body is provided with a guide groove, the guide groove passes through the end surface of the first rod body away from the first head, and the shrink fit column is arranged at the bottom of the guide groove; the guide groove is used to guide the reciprocating movement of the second rod body along the length direction of the connecting rod.

[0014] In one embodiment, the circumferential surfaces of the first shaft and the second shaft transition smoothly at the guide groove.

[0015] In one embodiment, the first shrink fit structure has a shrink fit column extending along the length direction of the rod body, and the second shrink fit structure has a shrink fit groove, which extends along the length direction of the rod body and passes through the end surface of the second rod body away from the second head, and the shrink fit column is shrink fit with the shrink fit groove.

[0016] The present invention also provides a reciprocating compressor, comprising:

[0017] crankshaft;

[0018] piston; and

[0019] In the connecting rod mentioned above, the first head portion is connected to the crankshaft, and the second head portion is connected to the piston.

[0020] The present invention also provides a refrigeration device, comprising the above-mentioned reciprocating compressor.

[0021] The present invention also provides a connecting rod assembly, comprising:

[0022] The first rod mentioned above; and

[0023] The second rod mentioned above.

[0024] In the above-mentioned connecting rod, the center distance between the first head and the second head can be adjusted by adjusting the shrinkage position of the first shrinkage structure and the second shrinkage structure, so as to meet the requirements of different stroke volumes and corresponding cooling capacities of the compressor, and has good versatility. After the center distance between the first head and the second head is determined, the first rod body and the second rod body are fixedly connected by shrinkage fitting the first shrinkage structure and the second shrinkage structure, and the center distance between the first head and the second head is fixed. That is, after the center distance between the first head and the second head is determined, the first rod body and the second rod body can be fixedly connected and the center distance between the first head and the second head can be fixed without the use of fixings. Compared with the connecting rod in the related art, the above-mentioned connecting rod can omit the fixings, that is, the above-mentioned connecting rod has fewer parts compared with the connecting rod in the related art, thereby making the structure of the connecting rod simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0026] Figure 1 Schematic diagram of the three-dimensional structure of a connecting rod (when the center distance is L1) according to an embodiment of the present invention;

[0027] Figure 2 Schematic diagram of the three-dimensional structure of a connecting rod (when the center distance is L2) according to an embodiment of the present invention;

[0028] Figure 3 Schematic diagram of the three-dimensional structure of a connecting rod assembly according to an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the three-dimensional structure of a connecting rod assembly according to another embodiment of the present invention.

[0030] Description of Figure Numbers:

[0031]

[0032]

[0033] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] 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 position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] The present invention provides a connecting rod.

[0038] In the embodiment of the present invention, Figure 1-Figure 3 As shown, one end of the connecting rod 10 is used to connect to the crankshaft of the compressor, and the other end is used to connect to the piston of the compressor, realizing the important function of the crankshaft driving the piston to perform reciprocating motion.

[0039] The connecting rod 10 includes a first rod body 200 and a second rod body 300 .

[0040] The first rod body 200 includes a first shaft 210 and a first head 220. The first head 220 is disposed at one end of the first shaft 210. The end of the first shaft 210, distal from the first head 220, has a first shrink fit structure 212. Specifically, in this embodiment, the first shaft 210 and the first head 220 are integrally formed. This facilitates manufacturing of the first rod body 200.

[0041] The second rod body 300 includes a second shaft 310 and a second head 320. The second head 320 is disposed at one end of the second shaft 310. The end of the second shaft 310, distal from the second head 320, has a second shrink fit structure 312. Specifically, in this embodiment, the second shaft 310 and the second head 320 are integrally formed. This facilitates manufacturing of the second rod body 300.

[0042] Along the length of the connecting rod 10, the first shrink fit structure 212 and the second shrink fit structure 312 have multiple shrink fit positions, and the first head 220 and the second head 320 have multiple center distances corresponding to the multiple shrink fit positions. The first shrink fit structure 212 and the second shrink fit structure 312 are shrink fit-fitted at the corresponding shrink fit positions, so that the center distance between the first head 220 and the second head 320 is defined as the center distance between the corresponding shrink fit positions. In other words, the design of the first shrink fit structure 212 and the second shrink fit structure 312 ensures that the shrink fit positions of the first shrink fit structure 212 and the second shrink fit structure 312 are adjustable along the length of the connecting rod 10, thereby adjusting the center distance between the first head 220 and the second head 320. After the center distance between the first head 220 and the second head 320 is determined, a shrink fit operation is performed to shrink fit the first shrink fit structure 212 and the second shrink fit structure 312, thereby fixing the first rod body 200 and the second rod body 300 and fixing the center distance between the first head 220 and the second head 320.

[0043] It should be noted that the center distance between the first head 220 and the second head 320 refers to the distance between the central axis of the first head 220 and the central axis of the second head 320, that is, Figure 1 L1 and Figure 2 L2 in the figure. Specifically, in this embodiment, both the first head 220 and the second head 320 are hollow structures with both ends open. This makes it very convenient for one end of the connecting rod 10 (one of the first head 220 and the second head 320) to be connected to the crankshaft of the compressor, and the other end (the other of the first head 220 and the second head 320) to be connected to the piston of the compressor, thereby realizing the important function of the crankshaft driving the piston to reciprocate. More specifically, in this embodiment, both the first head 220 and the second head 320 are cylindrical. The first head 220 is adapted to the crankshaft of the reciprocating compressor, and the second head 320 is adapted to the piston of the reciprocating compressor.

[0044] It should be noted that shrink fit refers to the use of the principle of thermal expansion and contraction to make two parts interference fit and fixedly connected together. Shrink fit can be achieved through shrink fit operation. For example, the size of the second shrink fit structure of the second component is slightly smaller than the size of the first shrink fit structure of the first component. At the same temperature, the first shrink fit structure of the first component and the second shrink fit structure of the second component cannot be shrink fit. When performing the shrink fit operation, the second shrink fit structure can be heated to a certain temperature, so that the second shrink fit structure expands and becomes larger in size. Then, the first shrink fit structure is inserted into the second shrink fit structure. After the temperature of the second shrink fit structure drops, the second shrink fit structure shrinks and becomes smaller in size, so that the first shrink fit structure and the second shrink fit structure are interference fit and fixedly connected together. At this time, the first shrink fit structure and the second shrink fit structure are shrink fit.

[0045] In this embodiment, both the first shrink fit structure 212 and the second shrink fit structure 312 are made of iron-based powder metallurgy. During the shrink fit operation, the second shrink fit structure 312 can be heated to 100-150°C, and then the first shrink fit structure 212 can be inserted into the second shrink fit structure 312. The shrink fit can then be achieved by naturally cooling the first shrink fit structure 212 to room temperature.

[0046] After the first shrink fit structure 212 and the second shrink fit structure 312 are shrink-fitted, the first rod 200 and the second rod 300 are fixedly connected together. That is, in the aforementioned connecting rod 10, the first rod 200 and the second rod 300 are fixedly connected together. Before the first shrink fit structure 212 and the second shrink fit structure 312 are shrink-fitted, the first rod 200 and the second rod 300 are not fixedly connected together and are in a separate state. The assembly including the first rod 200 and the second rod 300 in the separate state is the connecting rod assembly 20. That is, in this embodiment, the main difference between the connecting rod assembly 20 and the aforementioned connecting rod 10 is whether the first rod 200 and the second rod 300 are fixedly connected together through a shrink fit operation.

[0047] In the connecting rod 10 described above, the center-to-center distance between the first head 220 and the second head 320 can be adjusted by adjusting the shrink fit positions of the first shrink fit structure 212 and the second shrink fit structure 312, thereby meeting the requirements of different compressor stroke volumes and corresponding cooling capacities, thereby providing excellent versatility. Once the center-to-center distance between the first head 220 and the second head 320 is determined, the first shrink fit structure 212 and the second shrink fit structure 312 are shrink-fitted together to securely connect the first rod body 200 and the second rod body 300, and to fix the center-to-center distance between the first head 220 and the second head 320. In other words, once the center-to-center distance between the first head 220 and the second head 320 is determined, the first rod body 200 and the second rod body 300 can be securely connected and the center-to-center distance between the first head 220 and the second head 320 can be fixed without the use of fixings.

[0048] Compared to a connecting rod in the related art, the connecting rod 10 can omit a fixing member, that is, the connecting rod 10 has fewer parts than a connecting rod in the related art, thereby making the structure of the connecting rod 10 simpler. Compared to a connecting rod assembly in the related art, the connecting rod assembly 20 can omit a fixing member, that is, the connecting rod assembly 20 has fewer parts than a connecting rod assembly in the related art, thereby making the structure of the connecting rod assembly 20 simpler.

[0049] In some embodiments, the first heat-shrink sleeve structure 212 includes a heat-shrink sleeve column 212a. The second heat-shrink sleeve structure 312 includes a heat-shrink sleeve groove 312a. There are multiple heat-shrink sleeve columns 212a and / or multiple heat-shrink sleeve grooves 312a. The multiple heat-shrink sleeve columns 212a and / or multiple heat-shrink sleeve grooves 312a are arranged at intervals along the length of the connecting rod 10, so that the heat-shrink positions of the first heat-shrink sleeve structure 212 and the second heat-shrink sleeve structure 312 are adjustable along the length of the connecting rod 10. The connecting rod 10 includes at least one heat-shrink sleeve portion 10a. The heat-shrink sleeve portion 10a includes a heat-shrink sleeve column 212a and a heat-shrink sleeve groove 312a for heat-shrink fit.

[0050] (1) When there is one shrink fit column 212a and multiple shrink fit grooves 312a (greater than or equal to two), and the multiple shrink fit grooves 312a are arranged at intervals along the length direction of the second rod 310, a shrink fit groove 312a at a certain position can be selected according to actual needs to shrink fit the shrink fit column 212a. In this case, the shrink fit position of the first shrink fit structure 212 and the second shrink fit structure 312 is the position of the selected shrink fit groove 312a. Since there are multiple shrink fit grooves 312a and the multiple shrink fit grooves 312a are arranged at intervals along the length direction of the second rod 310, the shrink fit position of the first shrink fit structure 212 and the second shrink fit structure 312 can be adjusted along the length direction of the connecting rod 10, thereby making the center distance between the first head 220 and the second head 320 adjustable. When the shrink fitting column 212a is shrink fitted with the selected shrink fitting groove 312a to form a shrink fitting portion 10a, the first rod 200 and the second rod 300 are fixedly connected, and the center distance between the first head 220 and the second head 320 is fixed.

[0051] It should be noted that the plurality of shrink fit grooves 312a can be arranged at equal intervals or at unequal intervals along the length direction of the second rod 310. Furthermore, the connecting rod 10 has only one shrink fit portion 10a.

[0052] (2) When there are multiple (or greater than or equal to two) heat-shrink columns 212a, there is one heat-shrink groove 312a, and the multiple heat-shrink columns 212a are arranged at intervals along the length direction of the first shaft 210, a heat-shrink column 212a and a heat-shrink groove 312a at a certain position can be selected for heat-shrinking according to actual needs. In this case, the heat-shrinking position of the first heat-shrinking structure 212 and the second heat-shrinking structure 312 is the position of the selected heat-shrinking column 212a. Since there are multiple heat-shrinking columns 212a and the multiple heat-shrinking columns 212a are arranged at intervals along the length direction of the first shaft 210, the heat-shrinking positions of the first heat-shrinking structure 212 and the second heat-shrinking structure 312 are adjustable along the length direction of the connecting rod 10, thereby making the center distance between the first head 220 and the second head 320 adjustable. When the shrink fitting groove 312a and the selected shrink fitting column 212a are shrink fitted to form a shrink fitting portion 10a, the first rod 200 and the second rod 300 are fixedly connected, and the center distance between the first head 220 and the second head 320 is fixed.

[0053] It should be noted that the multiple shrink fit posts 212a can be arranged at equal or unequal intervals along the length of the first shaft 210. In this case, the connecting rod 10 has only one shrink fit portion 10a. It should also be noted that to prevent one, two, or even more of the shrink fit posts 212a from interfering with the shrink fit, the second shaft 310 is further provided with a relief groove that can simultaneously avoid one, two, or even more shrink fit posts 212a.

[0054] (3) When there are multiple (greater than or equal to two) heat-shrink columns 212a and multiple heat-shrink grooves 312a, and the multiple heat-shrink columns 212a are arranged at intervals along the length direction of the first shaft 210, and the multiple heat-shrink grooves 312a are arranged at intervals along the length direction of the second shaft 310, the heat-shrink grooves 312a of a certain area can be selected according to actual needs (the heat-shrink grooves 312a of the area can be one, two or even more) and heat-shrink columns 212a with the same number in the corresponding area can be heat-shrinked one-to-one. At this time, the heat-shrink positions of the first heat-shrink structure 212 and the second heat-shrink structure 312 are the positions of the selected area. Because there are multiple shrink fit columns 212a and shrink fit grooves 312a, and the multiple shrink fit columns 212a are spaced apart along the length of the first rod 210, and the multiple shrink fit grooves 312a are spaced apart along the length of the second rod 310, the shrink fit positions of the first shrink fit structure 212 and the second shrink fit structure 312 are adjustable along the length of the connecting rod 10, thereby making the center distance between the first head 220 and the second head 320 adjustable. When the shrink fit grooves 312a in a selected area are shrink fit-fitted one-to-one with the same number of shrink fit columns 212a in the corresponding area to form at least one shrink fit portion 10a, the first rod 200 and the second rod 300 are fixedly connected, and the center distance between the first head 220 and the second head 320 is fixed.

[0055] It should be noted that the plurality of shrink fit columns 212a are arranged at equal intervals along the length of the first shaft 210, and the plurality of shrink fit grooves 312a are also arranged at equal intervals along the length of the second shaft 310. Furthermore, the spacing between two adjacent shrink fit columns 212a and the spacing between two adjacent shrink fit grooves 312a are equal. In this case, the connecting rod 10 may have only one shrink fit portion 10a, or may have two or more shrink fit portions 10a.

[0056] It should also be noted that the number of heat-shrink columns 212a and the number of heat-shrink grooves 312a may be the same or different. When the number of heat-shrink columns 212a is greater than the number of heat-shrink grooves 312a, to prevent one, two, or even more of the heat-shrink columns 212a from interfering with the heat-shrink fit, the second shaft 310 is further provided with a clearance groove, which can simultaneously avoid one, two, or even more heat-shrink columns 212a. When the number of heat-shrink columns 212a is the same as the number of heat-shrink grooves 312a, or when the number of heat-shrink grooves 312a is greater than the number of heat-shrink columns 212a, the heat-shrink columns 212a will not interfere with the heat-shrink fit. In this case, the second shaft 310 does not need to be provided with a clearance groove.

[0057] In this embodiment, if Figure 1-Figure 3 As shown, at least one of the heat-shrink sleeve columns 212a and the heat-shrink sleeve grooves 312a is greater than or equal to four. In this way, the center distance between the first head 220 and the second head 320 can be adjusted in a larger range and has a wider application range.

[0058] In this embodiment, there are two or more shrink fit parts 10a. In this case, there are multiple shrink fit columns 212a and multiple shrink fit grooves 312a. Since there are two or more shrink fit parts 10a, there are two or more fixed connection points, which can make the connection between the first rod body 200 and the second rod body 300 more secure.

[0059] In this embodiment, the number of the thermal sleeve columns 212a is the same as the number of the thermal sleeve slots 312a. In this case, there are multiple thermal sleeve columns 212a and multiple thermal sleeve slots 312a.

[0060] It should be noted that the shape of the heat-shrink sleeve post 212a matches the shape of the heat-shrink sleeve groove 312a. Specifically, in this embodiment, the heat-shrink sleeve post 212a is cylindrical, and the heat-shrink sleeve groove 312a is also cylindrical. This facilitates the heat-shrink fit. It is understood that in other embodiments, the heat-shrink sleeve post 212a and the heat-shrink sleeve groove 312a can also be square.

[0061] In this embodiment, the first shaft 210 is provided with a guide groove 214. The guide groove 214 extends through the end surface of the first shaft 210 away from the first head 220. The shrink fit post 212a is disposed at the bottom of the guide groove 214. The guide groove 214 is used to guide the reciprocating movement of the second shaft 310 along the length of the connecting rod 10. During the alignment process between the shrink fit post 212a and the shrink fit groove 312a, the second shaft 310 needs to reciprocate along the length of the connecting rod 10. The provision of the guide groove 214 for guiding the reciprocating movement of the second shaft 310 along the length of the connecting rod 10 greatly facilitates the alignment of the shrink fit post 212a and the shrink fit groove 312a.

[0062] It should be noted that when the temperature of the second shaft 310 increases, the shrink sleeve groove 312a expands and becomes larger, and the second shaft 310 also expands and becomes larger. Therefore, the guide groove 214 is used to guide the reciprocating movement of the second shaft 310 along the length direction of the connecting rod 10. This not only means that the unheated second shaft 310 can slide back and forth in the guide groove 214 along the length direction of the connecting rod 10, but also means that the heated second shaft 310 can slide back and forth in the guide groove 214 along the length direction of the connecting rod 10. In other words, both the unheated second shaft 310 and the heated second shaft 310 have a circumferential clearance fit with the guide groove 214, and the circumferential clearance fit between the unheated second shaft 310 or the cooled second shaft 310 and the guide groove 214 is greater than the circumferential clearance fit between the heated second shaft 310 and the guide groove 214.

[0063] That is, before the shrink fit, the shrink fit post 212a is slightly larger than the shrink fit groove 312a. For example, the outer diameter R1 of the shrink fit post 212a is 1-1.5 mm larger than the inner diameter R2 of the shrink fit groove 312a. When the second shaft 310 is heated, the shrink fit groove 312a expands and becomes larger, with R2 becoming equal to R1. The shrink fit post 212a can be inserted into the shrink fit groove 312a, and the second shaft 310 also expands and becomes larger. At this point, the second shaft 310 and the guide groove 214 have a clearance fit, and the circumferential clearance can be 1-1.5 mm. When the temperature of the second shaft 310 decreases, the shrink fit post 212a and the shrink fit groove 312a shrink fit, and the second shaft 310 and the guide groove 214 have a clearance fit, and the circumferential clearance increases.

[0064] It is understandable that in other embodiments, the guide groove 214 may be omitted. In this case, the shrink sleeve column 212 a is protruded from the circumferential surface of the first shaft 210 .

[0065] In this embodiment, the guide groove 214 is located on the first shaft 210. It will be appreciated that in other embodiments, the guide groove 214 may also be located on the second shaft 310. Specifically, the second shaft 310 defines a guide groove 214 that extends through the end surface of the second shaft 310 distal from the second head 320. A shrink fit groove 312a is defined at the bottom of the guide groove 214. The guide groove 214 serves to guide the reciprocating movement of the first shaft 210 along the length of the connecting rod 10.

[0066] At this time, when the temperature of the second shaft 310 increases, the shrink fit groove 312a expands and becomes larger, and the guide groove 214 also expands and becomes larger. The guide groove 214 is used to guide the reciprocating movement of the first shaft 210 along the length of the connecting rod 10. This implies that the first shaft 210 can slide back and forth along the length of the connecting rod 10 within the heated guide groove 214. The first shaft 210 and the heated guide groove 214 have a clearance fit. After the shrink fit is completed, the guide groove 214 and the first shaft 210 can have an interference fit after the temperature is lowered. In this way, based on the fixed connection between the shrink fit column 212a and the shrink fit groove 312a, the guide groove 214 and the first shaft 210 can also be fixedly connected, thereby further strengthening the connection between the first and second shafts 200 and 300.

[0067] In this embodiment, the circumferential surfaces of the first shaft 210 and the second shaft 310 form a smooth transition at the guide groove 214. That is, when the second shaft 310 is connected to the first shaft 210, the outer surface of the connecting rod 10 at the guide groove 214 is generally flat or curved, without obvious concave or convex areas. This improves the integrity of the connecting rod 10.

[0068] When the guide groove 214 is located on the first shaft 210, the circumferential surface of the second shaft 310 away from the groove bottom of the guide groove 214 smoothly transitions to the circumferential surface of the first shaft 210 where the guide groove 214 is provided. It is understood that in other embodiments, there may be a height difference between the circumferential surface of the second shaft 310 away from the groove bottom of the guide groove 214 and the circumferential surface of the first shaft 210 where the guide groove 214 is provided. That is, the circumferential surface of the second shaft 310 away from the groove bottom of the guide groove 214 may protrude to the outside of the circumferential surface of the first shaft 210 where the guide groove 214 is provided, or may be located on the inside of the circumferential surface of the first shaft 210 where the guide groove 214 is provided.

[0069] When the guide groove 214 is located on the second shaft 310, the circumferential surface of the first shaft 210 away from the groove bottom of the guide groove 214 smoothly transitions to the circumferential surface of the second shaft 310 where the guide groove 214 is provided. It is understood that in other embodiments, there may be a height difference between the circumferential surface of the first shaft 210 away from the groove bottom of the guide groove 214 and the circumferential surface of the second shaft 310 where the guide groove 214 is provided. In other words, the circumferential surface of the first shaft 210 away from the groove bottom of the guide groove 214 may protrude to the outside of the circumferential surface of the second shaft 310 where the guide groove 214 is provided, or may be located inside the circumferential surface of the second shaft 310 where the guide groove 214 is provided.

[0070] In other embodiments, Figure 4 As shown, the first shrink fit structure 212 has a shrink fit post 212a, which extends along the length of the first shaft 210. The second shrink fit structure 312 has a shrink fit groove 312a, which extends along the length of the second shaft 310 and penetrates the end surface of the second shaft 310 away from the second head 320. The shrink fit post 212a is shrink fit with the shrink fit groove 312a.

[0071] Before shrink fitting, the size of the shrink fitting column 212a is slightly larger than the size of the shrink fitting groove 312a. Figure 4 In the illustrated embodiment, the heat-shrink sleeve column 212a is heat-shrink-fitted with the heat-shrink sleeve groove 312a, implying that when the heat-shrink sleeve groove 312a is heated to a higher temperature, the heat-shrink sleeve groove 312a expands and becomes larger in size, so that the heat-shrink sleeve column 212a can slide back and forth in the heated heat-shrink sleeve groove 312a along the length direction of the connecting rod, so that the heat-shrink sleeve position of the first heat-shrink sleeve structure 212 and the second heat-shrink sleeve structure 312 can be adjusted in the length direction of the connecting rod 10. After the temperature of the heat-shrink sleeve groove 312a is reduced, the heat-shrink sleeve groove 312a and the heat-shrink sleeve column 212a are heat-shrink-fitted.

[0072] The present invention also provides a reciprocating compressor including the connecting rod. The specific structure of the connecting rod is described with reference to the above-described embodiments. Since the present reciprocating compressor utilizes all of the technical solutions of all of the above-described embodiments, it at least possesses all of the beneficial effects brought about by the technical solutions of the above-described embodiments, and therefore, no further details are given here. The first head portion 220 is adapted to fit the crankshaft of the reciprocating compressor, and the second head portion 320 is adapted to fit the piston of the reciprocating compressor.

[0073] The present invention further provides a refrigeration device including the reciprocating compressor. The specific structure of the reciprocating compressor is described with reference to the above-described embodiments. Since the present refrigeration device utilizes all of the technical solutions of all of the above-described embodiments, it at least has all of the beneficial effects provided by the technical solutions of the above-described embodiments, and thus will not be described in detail here. The refrigeration device may be a refrigerator, an air conditioner, or the like.

[0074] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present description and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A connecting rod, characterized in that: include: The first rod body comprises a first rod shaft and a first head portion provided at one end of the first rod shaft, wherein the other end of the first rod shaft has a first shrink fit structure; as well as The second rod body comprises a second rod shaft and a second head portion provided at one end of the second rod shaft, wherein the other end of the second rod shaft has a second shrink fit structure; In the length direction of the connecting rod, the first shrink fit structure and the second shrink fit structure have a plurality of shrink fit positions, the first head and the second head have a plurality of center distances corresponding to the plurality of shrink fit positions, and the first shrink fit structure and the second shrink fit structure are shrink fit-fitted at the corresponding shrink fit positions to limit the center distance between the first head and the second head to the center distance corresponding to the shrink fit positions; The first head and the second head are both cylindrical.

2. The connecting rod according to claim 1, wherein: The first heat-shrink sleeve structure has a heat-shrink sleeve column, and the second heat-shrink sleeve structure has a heat-shrink sleeve groove. At least one of the heat-shrink sleeve column and the heat-shrink sleeve groove is in plurality and arranged at intervals along the length direction of the connecting rod. The connecting rod has at least one shrink fit portion, and the shrink fit portion includes a shrink fit column and a shrink fit groove.

3. The connecting rod according to claim 2, wherein: At least one of the thermal jacket columns and the thermal jacket slots is greater than or equal to four.

4. The connecting rod according to claim 2, wherein: The number of the heat-shrink sleeve columns is the same as the number of the heat-shrink sleeve slots; and / or The number of the heat-shrink sleeve parts is greater than or equal to two.

5. The connecting rod according to claim 2, wherein: The first rod body is provided with a guide groove, which passes through the end surface of the first rod body away from the first head, and the shrink sleeve column is arranged at the bottom of the guide groove; the guide groove is used to guide the reciprocating movement of the second rod body along the length direction of the connecting rod.

6. The connecting rod according to claim 5, wherein: The circumferential surfaces of the first shaft and the second shaft transition smoothly at the guide groove.

7. The connecting rod according to claim 1, wherein: The first shrink fit structure has a shrink fit column extending along the length direction of the rod body, and the second shrink fit structure has a shrink fit groove, which extends along the length direction of the rod body and passes through the end surface of the second rod body away from the second head. The shrink fit column is shrink fit with the shrink fit groove.

8. A reciprocating compressor, characterized in that: include: crankshaft; piston; as well as The connecting rod according to any one of claims 1 to 7, wherein the first head is connected to the crankshaft, and the second head is connected to the piston.

9. A refrigeration device, characterized in that: Comprising the reciprocating compressor of claim 8.

10. A connecting rod assembly, characterized in that: include: The first rod according to any one of claims 1 to 7; as well as The second rod according to any one of claims 1 to 7.

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