Piston high-efficiency compressor connecting rod structure and assembling method thereof

Abstract

A piston type high-efficiency compressor connecting rod structure and an assembling method thereof belong to the technical field of compressors, and the piston type high-efficiency compressor connecting rod structure comprises a connecting rod body and a connecting rod cover which are detachably connected, one end of the connecting rod body is provided as a connecting rod small head, the connecting rod small head is inserted into a cylinder hole of a crankcase after being connected with a piston, and the other end of the connecting rod body is connected with the connecting rod cover to form a connecting rod large hole which is tightly connected with an end part of a crankshaft, and a groove structure is arranged at a matching surface of the connecting rod body and the connecting rod cover, the cylinder body in the present application is not processed with a crescent groove, a split connecting rod structure is adopted to replace a whole connecting rod, the matching precision of the connecting rod is ensured, the assembling method of the connecting rod structure is changed, the refrigeration machine oil is prevented from being thrown out from the upper end of the crankshaft and entering the cylinder hole, and the working reliability and service life of the compressor are improved.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a connecting rod structure for a high-efficiency piston compressor and its assembly method. Background Technology

[0002] Currently, such as Figure 1 As shown, integral connecting rods are commonly used in the refrigerator compressor industry. To ensure the assembly of integral connecting rods, crescent grooves 4-4 need to be added to the cylinder block 4-2 of the crankcase 4. When assembling integral connecting rods, piston 3 is installed in the cylinder bore 4-3 of the cylinder block. First, one end of the integral connecting rod is installed on the eccentric shaft end of the crankshaft 14, and then the other end of the integral connecting rod is inserted into the piston 3. Then, the piston pin 7 passes through the crescent groove 4-4 to connect the piston 3 to one end of the connecting rod.

[0003] The crescent-shaped groove design allows oil ejected from the crankshaft during compressor operation to more easily enter the cylinder bore, enabling the refrigeration oil to participate in the compressor's intake, compression, exhaust, and expansion processes. However, the addition of oil to the refrigeration cycle reduces the amount of refrigerant circulating, lowering the compressor's cooling capacity. Simultaneously, it increases the amount of oil discharged from the compressor. This discharged oil enters the evaporator and condenser of the refrigeration system, occupying space and affecting heat exchange, further reducing the cooling capacity.

[0004] For example, patent CN211082203U discloses a crankcase semi-finished product, which includes a base, a crankshaft seat, and a cylinder body. The cylinder body is disposed on the crankshaft seat and located on one side of the crankshaft seat. The cylinder body has a first end face adjacent to the crankshaft seat and a second end face opposite to the first end face. The cylinder body has a processing area, which is adapted to be removed to form a cylinder bore penetrating the first end face and the second end face. The first end face has a vertically extending connecting channel that penetrates the processing area. The connecting channel has an upper groove above the processing area and a lower groove below the processing area. Due to the upper groove on the crankcase cylinder body, the technical problem proposed in this invention still exists: oil thrown out from the upper end of the crankshaft is more likely to enter the cylinder bore through the upper groove. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a connecting rod structure for a high-efficiency piston compressor and its assembly method. The cylinder block does not have a crescent groove machined on it, and a split connecting rod structure is used instead of a monolithic connecting rod. By changing the assembly method, refrigerant oil is prevented from being thrown out from the upper end of the crankshaft and entering the cylinder bore, thus improving the compressor's operational reliability and service life.

[0006] To achieve the above objectives, the technical solution adopted by the present invention to solve its technical problem is as follows: the connecting rod structure of the piston-type high-efficiency compressor includes a detachably connected connecting rod body and a connecting rod cover. One end of the connecting rod body is configured as a small connecting rod end, which is connected to the piston and then inserted into the cylinder bore of the crankcase. The other end of the connecting rod body is connected to the connecting rod cover to form a large connecting rod hole that is tightly connected to the end of the crankshaft. A groove structure is provided at the mating surface of the connecting rod body and the connecting rod cover.

[0007] The crankcase includes an integrally formed crankshaft seat and a cylinder block. The crankshaft is installed at the center of the crankshaft seat. The outer wall of the cylinder block is set as a closed surface. The cylinder bore is provided in the cylinder body and extends through the entire cylinder body from the outer wall of the cylinder body.

[0008] After the small end of the connecting rod is inserted into the piston, it is positioned and connected by a piston pin, and the piston pin is positioned and connected to the piston by a spring pin.

[0009] One end of the connecting rod body that forms the connecting rod large hole is set as an arc segment. After the arc segment is connected to the connecting rod cover, it forms the connecting rod large hole and is connected by a fastening screw.

[0010] The groove structure is provided along the outer periphery of the connecting rod body or the end face of the connecting rod cover, the two ends of the groove structure are connected through each other, and the groove structure is separated from the inner wall surface of the connecting rod large hole by a certain distance.

[0011] The width of the groove structure is set to 0.3-1mm, the depth is 0.1-0.5mm, and the distance between the groove structure and the inner wall of the connecting rod large hole is 0.8-1.5mm.

[0012] The mating surface between the connecting rod body and the connecting rod cover is set as a stepped surface, and the inner section of the stepped surface forms a mating gap.

[0013] A grooved anti-fool block I is provided on the outer side of the end of the connecting rod body away from the small end of the connecting rod, and grooved anti-fool blocks II are respectively provided on the outer sides of both ends of the connecting rod cover to mate with the corresponding grooved anti-fool blocks I.

[0014] The inner sides of the mating surfaces of the connecting rod body and the connecting rod cover are provided with inclined surfaces, and the two inclined surfaces meet to form a V-shaped groove.

[0015] The connecting rod body and connecting rod cap are made of wear-resistant aluminum alloy.

[0016] The connecting rod body has weight reduction grooves on both sides.

[0017] An assembly method for a connecting rod structure of a piston-type high-efficiency compressor includes the following steps:

[0018] Step 1: After processing and cleaning, the assembled split connecting rods are sorted in a constant temperature and humidity warehouse to form the connecting rod body and connecting rod cover group of connecting rod large holes;

[0019] Step 2: Select a piston that matches the cylinder bore clearance. Based on the crankshaft eccentric shaft group, select a split connecting rod that meets the assembly clearance requirements. Select a piston pin that corresponds to the piston pin hole of the small end of the connecting rod.

[0020] Step 3: Insert the small end of the connecting rod into the piston cavity, pass the piston pin through the piston and insert it into the small end of the connecting rod, and then pass the spring pin laterally through the piston end face and connect it with the piston pin. Assemble the piston pin, piston and connecting rod body together through the spring pin.

[0021] Step 4: Separate the connecting rod body and connecting rod cap of the split connecting rod, insert the connecting rod body with the piston into the cylinder bore, install the crankshaft in the crankshaft seat, so that the large bore end of the connecting rod body partially surrounds the eccentric end of the crankshaft.

[0022] Step 5: Ensure that the connecting rod cap is aligned with the end of the connecting rod body that forms the connecting rod bore in the correct assembly direction. Secure the connecting rod cap to the connecting rod body with the fastening screws to surround the crankshaft with the connecting rod bore. Rotate the crankshaft to ensure that the assembled connecting rod operates freely before proceeding to the next assembly step.

[0023] The beneficial effects of this invention are:

[0024] 1. This invention eliminates the crescent groove used for mounting piston pins on the crankcase and adopts a split connecting rod structure instead of an integral connecting rod. This prevents refrigeration oil thrown from the upper end of the crankshaft from entering the cylinder bore through the crescent groove in the crankcase, which would lead to problems such as reduced heat exchange area between the compressor oil injector and the refrigeration system, resulting in low compressor cooling capacity. At the same time, there is no need to machine crescent grooves and chamfers on the crankcase, reducing machining steps and saving energy and reducing costs.

[0025] 2. This invention incorporates a groove structure at the mating surface of the connecting rod body and connecting rod cap. The groove structure extends through both ends and is spaced a distance from the inner wall of the connecting rod bore. Firstly, the groove structure reduces the machining area of ​​the mating surface, making it easier to ensure the flatness and dimensions of the connecting rod body and connecting rod cap. This results in high dimensional accuracy and stable clearance between the connecting rod bore and the crankshaft mating hole, improving compressor reliability and preventing issues such as noise and power abnormalities caused by excessive sealing area during assembly, which can lead to misalignment. Secondly, the distance between the groove structure and the inner wall of the connecting rod bore ensures a sufficient sealing surface for oil at the gap between the connecting rod body / connecting rod cap and the crankshaft, preventing oil from flowing into the groove structure and ensuring a proper seal. Third, the through-type design at both ends of the groove structure allows the cooling oil thrown out by the crankshaft to dissipate heat through the groove structure, increasing the heat dissipation channel, increasing the heat exchange area, reducing the impact of high temperature on connecting rod deformation, improving the wear of the connecting rod bore and crankshaft, further ensuring the precision of compressor parts, improving the reliability of the compressor, and extending its service life.

[0026] 3. This invention provides inclined surfaces on the inner sides of the mating surfaces of both the connecting rod body and the connecting rod cap. Two inclined surfaces meet to form a V-groove. The two inclined surfaces are assembled opposite each other. This ensures the correct assembly direction of the connecting rod body and the connecting rod cap, guaranteeing the consistency of the mating accuracy with the precision achieved during connecting rod machining. Furthermore, when the gap between the connecting rod bore and the crankshaft is filled with oil during operation, the V-groove can also act as an oil reservoir. Under harsh operating conditions or heavy loads, the refrigerant oil in this V-groove will fully lubricate the mating gap between the connecting rod bore and the crankshaft during crankshaft rotation. This ensures sufficient oil film on the moving parts, improving the reliability of the compressor under high loads or harsh conditions and extending the compressor's lifespan.

[0027] 4. This invention reduces the unbalanced inertial force of the crank-connecting rod rotation mechanism and lowers the vibration and noise of the compressor by setting weight-reducing grooves on both sides of the connecting rod body and changing the material of the connecting rod from traditional powder metallurgy material to wear-resistant aluminum alloy material. Attached Figure Description

[0028] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0029] Figure 1 This is a schematic diagram of the connecting rod structure in a conventional high-efficiency piston compressor.

[0030] Figure 2 This is a schematic diagram of the connecting rod structure of the piston-type high-efficiency compressor of the present invention;

[0031] Figure 3This is a schematic diagram of the assembly between the connecting rod structure and the piston in this invention;

[0032] Figure 4 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0033] Figure 5 for Figure 4 Schematic diagram of the middle connecting rod cover;

[0034] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0035] Figure 7 for Figure 6 Exploded view;

[0036] Figure 8 This is a schematic diagram of the connecting rod cover in Embodiment 3 of the present invention;

[0037] The markings in the above figures are as follows: 1. Connecting rod body, 1-1. Connecting rod small end, 1-2. Arc segment, 1-3. Weight reduction groove, 2. Connecting rod cap, 2-1. Groove, 3. Piston, 4. Crankcase, 4-1. Crankshaft seat, 4-2. Cylinder block, 4-3. Cylinder bore, 4-4. Crescent groove, 5. Connecting rod large bore, 6. Groove structure, 7. Piston pin, 8. Spring pin, 9. Stepped surface, 10. Grooved anti-foolproof block I, 11. Grooved anti-foolproof block II, 12. V-groove, 12-1. Inclined surface, 13. Fastening screw, 14. Crankshaft. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0039] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] The specific implementation scheme of the present invention is as follows: Figure 2 As shown, this invention provides a connecting rod structure for a piston-type high-efficiency compressor. This mounting structure includes a detachably connected connecting rod body 1 and a connecting rod cover 2. One end of the connecting rod body 1 is configured as a small connecting rod end 1-1, which is connected to the piston 3 and then inserted into the cylinder bore 4-3 of the crankcase 4. The other end of the connecting rod body 1 is connected to the connecting rod cover 2, forming a large connecting rod bore 5 that is tightly connected to the end of the crankshaft. The crankcase 4 includes an integrally formed crankshaft seat 4-1 and a cylinder body 4-2. The cylinder body 4-2 is located at one end of the crankshaft seat 4-1, and the crankshaft is installed at the center (crankshaft bore) of the crankshaft seat 4-1. The outer wall of the cylinder body 4-2 is a closed surface, and the cylinder bore 4-3 is provided inside the cylinder body 4-2. This invention eliminates the crescent groove used for mounting the piston pin 7 on the crankcase 4 and adopts a split connecting rod structure instead of an integral connecting rod. This prevents the oil thrown out of the upper end of the crankshaft from entering the cylinder bore 4-3 through the crescent groove of the crankcase 4, which would lead to problems such as reduced heat exchange area between the compressor oil injector and the refrigeration system, potential oil blockage in the throttling device, and low compressor cooling capacity. At the same time, the crescent groove and chamfer are not required to be machined on the crankcase 4, reducing the number of machining steps and saving energy and reducing costs.

[0042] Specifically, such as Figure 3 , 4As shown in Figures 7 and 8, a groove structure 6 is provided at the mating surface of the connecting rod body 1 and the connecting rod cap 2. The width of the groove structure 6 is set to 0.3-1mm, and the depth is 0.1-0.5mm. The groove structure 6 is set along the outer periphery of the end face of the connecting rod body 1 or the connecting rod cap 2. The setting of the groove structure 6 reduces the cutting area of ​​the mating surface, making it easier to ensure the flatness and part dimensions of the connecting rod body 1 and the connecting rod cap 2. The connecting rod large hole 5 and the crankshaft mating hole have high dimensional accuracy and stable clearance, resulting in good compressor reliability. It avoids a series of problems such as noise and power abnormalities caused by excessive assembly sealing area leading to abnormal fit between the connecting rod large hole 5 and the crankshaft due to out-of-tolerance. The groove structure 6 is open at both ends, allowing the cooling oil thrown out by the crankshaft to be dissipated through the groove structure 6, increasing the heat dissipation channel, increasing the heat exchange area, reducing the impact of high temperature on connecting rod deformation, improving the wear of the connecting rod large hole 5 and the crankshaft, further ensuring the precision of compressor parts, improving the reliability of the compressor, and extending its service life. The groove structure 6 is spaced 0.8 to 1.5 mm from the inner wall of the connecting rod bore 5. This ensures that the oil in the gap between the connecting rod body 1 and the connecting rod cap 2 forming the connecting rod bore 5 and the crankshaft has a certain width of sealing surface, preventing it from flowing into the groove structure 6 from the gap and ensuring a sealing effect.

[0043] Specifically, such as Figure 3 As shown, the small end 1-1 of the connecting rod is inserted into the piston 3 and then connected to it by the piston pin 7. The piston pin 7 is connected to the piston 3 by the spring pin 8, which ensures the stability of the connection between the small end 1-1 of the connecting rod and the piston 3. Moreover, when the piston 3 with the connecting rod body 1 is installed in the cylinder bore 4-3, the piston pin 7 is located in the cylinder bore 4-3 and is not exposed.

[0044] Specifically, such as Figure 3 , 4 As shown in Figures 6 and 7, one end of the connecting rod body 1 that forms the connecting rod large hole 5 is configured as an arc segment 1-2. The arc segment 1-2 is connected to the connecting rod cover 2 by a fastening screw 13. The mating surface between the connecting rod body 1 and the connecting rod cover 2 can be configured as a stepped surface 9. A mating gap is formed on the inner side of the stepped surface 9. When the flatness or size of the stepped surface 9 exceeds the tolerance, a tight fit on the outer side of the stepped surface 9 can be ensured, thus ensuring the reliability of the connection between the connecting rod body 1 and the connecting rod cover 2.

[0045] Specifically, such as Figure 4 and Figure 6As shown, the outer side of the end of the connecting rod body 1 away from the small end 1-1 of the connecting rod is provided with a grooved anti-misalignment block I10, and the outer sides of both ends of the connecting rod cover 2 are respectively provided with grooved anti-misalignment blocks II11 that mate with the corresponding grooved anti-misalignment blocks I10. When the connecting rod body 1 and the connecting rod cover 2 are correctly assembled, the outer tangent surfaces of the grooved anti-misalignment blocks I10 and II11 are in the same plane after they mate, which ensures the roundness of the connecting rod large hole 5, ensures the fitting accuracy of the connecting rod body 1 and the connecting rod cover 2 with the crankshaft after connection, and improves the reliability of the compressor.

[0046] Specifically, such as Figure 6 and Figure 7 As shown, the inner sides of the mating surfaces of the connecting rod body 1 and the connecting rod cover 2 are provided with inclined surfaces 12-1. The two inclined surfaces 12-1 are joined to form a V-groove 12. The two inclined surfaces 12-1 are assembled relative to each other. On the one hand, this ensures the correct assembly direction of the connecting rod body 1 and the connecting rod cover 2, and ensures the consistency of the fitting accuracy with the precision of the connecting rod during machining. On the other hand, when the gap between the connecting rod bore 5 and the crankshaft is filled with oil during operation, the V-groove 12 can also act as an oil reservoir. Under harsh working conditions or heavy loads, the refrigeration oil in this V-groove 12 will fully lubricate the mating gap formed by the connecting rod bore 5 and the crankshaft during crankshaft rotation. The oil film of the moving parts is sufficient, which improves the reliability of the compressor under high load or harsh working conditions and extends the compressor life.

[0047] Furthermore, the connecting rod body 1 and connecting rod cap 2 are made of wear-resistant aluminum alloy material, that is, aluminum with the addition of alloying elements such as Si and Cu to obtain an aluminum alloy with good wear resistance and high strength. This aluminum alloy material is an existing material, and the content of each alloying element will not be elaborated here. The integral connecting rod in the prior art is made of powder metallurgy material, which has a density close to that of iron and is relatively high. The density of aluminum alloy is significantly lower than that of powder metallurgy. The weight of aluminum alloy of the same volume is significantly lower than that of powder metallurgy. As the force transmitter of reciprocating connecting rods, the reciprocating inertial force and rotational inertial force generated by aluminum connecting rods during rotational motion are significantly lower than those of powder metallurgy connecting rods. The unbalanced force is small, resulting in low vibration and low noise. Furthermore, weight-reducing grooves 1-3 can be set on both sides of the connecting rod body 1 to further reduce the weight of the connecting rod, thereby reducing the unbalanced force and vibration.

[0048] The following embodiments illustrate the specific structural form of the connecting rod structure of a piston-type high-efficiency compressor.

[0049] Example 1

[0050] like Figure 3 , Figure 4 and Figure 5As shown, the mating surface between the connecting rod body 1 and the connecting rod cover 2 is a stepped surface 9. That is, a groove is provided on the inner side of the end face of the connecting rod body 1 away from the small end 1-1 of the connecting rod. On the end faces of the connecting rod cover 2, bosses are respectively provided to engage with the corresponding grooves. A groove 2-1 is provided on the boss. The depth of the groove 2-1 is 0.1 to 0.3 mm. After the connecting rod body 1 and the connecting rod cover 2 are mated, a mating gap is formed. When the flatness of the stepped surface 9 exceeds the tolerance, a tight fit on the outer side of the stepped surface 9 can be ensured, thus ensuring the reliability of the connection between the connecting rod body 1 and the connecting rod cover 2.

[0051] The connecting rod body 1 forms a connecting rod large hole 5. The two end faces (outer side of the slot) of the arc segment 1-2 are respectively provided with groove structure 6. The groove structure 6 is a curved groove. The curved groove is set along the outer periphery of the end face of the arc segment 1-2 and is arranged around the outer periphery of the mounting hole of the fastening screw 13. The width of the curved groove is set to 0.3-1mm and the depth is 0.1-0.5mm. The two ends of the curved groove are connected vertically, and the two ends of the curved groove are 0.8-1.5mm apart from the inner wall surface of the connecting rod large hole 5.

[0052] The outer sides of both ends of the arc segment 1-2 are provided with grooved anti-misalignment blocks I10, and the outer sides of both ends of the connecting rod cover 2 are respectively provided with grooved anti-misalignment blocks II11 that mate with the corresponding grooved anti-misalignment blocks I10. The mated grooved anti-misalignment blocks I10 and II11 are both located on the same side of the connecting rod, and both grooved anti-misalignment blocks I10 and II11 have external tangent surfaces. When they are mated together, they form a plane, which means that the assembly is successful.

[0053] After the connecting rod cover 2 and the connecting rod body 1 are assembled in the correct direction, the curved groove forms a heat dissipation channel. After the grooved anti-foolproof block I 10 and the grooved anti-foolproof block II 11 are connected, their outer tangent surfaces form a plane. The slot and the boss cooperate to form a fitting gap, ensuring the installation accuracy between the connecting rod cover 2 and the connecting rod body 1.

[0054] Example 2

[0055] like Figure 6 and Figure 7 As shown, the difference from Embodiment 1 is that the mating surfaces of the connecting rod body 1 and the connecting rod cover 2 are flat, and inclined surfaces are provided on the inner side of the end faces of both the connecting rod body 1 and the connecting rod cover 2. The two inclined surfaces meet to form a V-groove 12. The width of the V-groove 12 is 0.3 to 0.6 mm, and the depth is 0.2 to 0.4 mm.

[0056] Example 3

[0057] like Figure 8As shown, the connecting rod cover 2 differs from the connecting rod cover 2 in Embodiment 1 in that the groove structure 6 provided on both end faces of the connecting rod cover 2 includes annular grooves. The two ends of the annular grooves are respectively connected to connecting sections, and the two connecting sections make the entire groove structure 6 form a through structure. The width and depth of the annular groove are the same as the dimensions of the curved groove in Embodiment 1.

[0058] This invention is not limited to the technical solutions listed in Embodiments 1 to 3 above. Technical solutions formed by combining the technical features in Embodiments 1 to 3 are still within the protection scope of this invention.

[0059] The assembly method of the connecting rod structure of the above-mentioned high-efficiency piston compressor includes the following steps:

[0060] Step 1: After processing (including broaching, initial boring, fine boring, and end face chamfering) and cleaning, the assembled split connecting rods are sorted in a constant temperature and humidity warehouse into five groups of connecting rod bodies 1 and connecting rod caps 2 forming the connecting rod large holes.

[0061] Step 2: Select piston 3 that matches the fit clearance of cylinder bore 4-3. According to the group of the eccentric shaft of crankshaft 14, select a split connecting rod that meets the requirements of the group according to the assembly clearance requirements, and select the corresponding piston pin 7.

[0062] Step 3: Insert the small end 1-1 of the connecting rod into the cavity of the piston 3, and insert the piston pin 7 through the piston 3 into the small end 1-1 of the connecting rod. Then, the spring pin 8 passes laterally through the end face of the piston 3 and connects with the piston pin 7. Assemble the piston pin 7, piston 3 and connecting rod body 1 together through the spring pin 8.

[0063] Step 4: Remove the fastening screw 13, separate the connecting rod body 1 and connecting rod cover 2 of the split connecting rod, insert the piston 3 with the connecting rod body 1 installed into the cylinder bore 4-3, and install the crankshaft 14 in the crankshaft bore of the crankshaft seat 4-1 so that the large bore end of the connecting rod body 1 partially surrounds the eccentric shaft of the crankshaft 14.

[0064] Step 5: Ensure that the connecting rod cap 2 is aligned with the connecting rod body 1 in the correct assembly direction using the slotted anti-fool block or V-groove 12. Connect the connecting rod cap 2 to the connecting rod body 1 using the fastening screw 13. Pre-tighten first, then tighten. After tightening, the torque of the fastening screw 13 should be 3.0 to 4.5 NM. Rotate the crankshaft 14 to ensure that the assembled connecting rod operates freely before proceeding to the next assembly stage.

[0065] In summary, the cylinder block of this invention does not have a crescent groove machined on it, and a split connecting rod structure is used instead of an integral connecting rod. This ensures the fitting accuracy of the connecting rod, changes the assembly method of the connecting rod structure, and prevents refrigeration oil from being thrown out from the upper end of the crankshaft and entering the cylinder bore, thereby improving the working reliability and service life of the compressor.

[0066] The above description is merely an illustration of some principles of the present invention. This specification is not intended to limit the present invention to the specific structures and applicable scope shown. Therefore, all possible modifications and equivalents that may be used fall within the scope of the patent application of this invention.

Claims

1. A connecting rod structure for a piston-type high-efficiency compressor, characterized in that, It includes a detachably connected connecting rod body and a connecting rod cap. One end of the connecting rod body is configured as a small connecting rod end, which is connected to the piston and then inserted into the cylinder bore of the crankcase. The other end of the connecting rod body is connected to the connecting rod cap to form a large connecting rod bore that is tightly connected to the end of the crankshaft. A groove structure is provided at the mating surface of the connecting rod body and the connecting rod cap. The groove structure is provided along the outer periphery of the end face of the connecting rod body or the connecting rod cover, the two ends of the groove structure are provided through, and the groove structure is separated from the inner wall surface of the connecting rod large hole by a certain distance; The inner sides of the mating surfaces of the connecting rod body and the connecting rod cover are provided with inclined surfaces, and the two inclined surfaces meet to form a V-shaped groove.

2. The connecting rod structure of the piston-type high-efficiency compressor according to claim 1, characterized in that: The crankcase includes an integrally formed crankshaft seat and a cylinder block. The crankshaft is installed at the center of the crankshaft seat. The outer wall of the cylinder block is set as a closed surface. The cylinder bore is provided in the cylinder body and extends through the entire cylinder body from the outer wall of the cylinder body.

3. The connecting rod structure of the piston-type high-efficiency compressor according to claim 1, characterized in that: After the small end of the connecting rod is inserted into the piston, it is positioned and connected by a piston pin, and the piston pin is positioned and connected to the piston by a spring pin.

4. The connecting rod structure of the piston-type high-efficiency compressor according to claim 1, characterized in that: One end of the connecting rod body that forms the connecting rod large hole is set as an arc segment. After the arc segment is connected to the connecting rod cover, it forms the connecting rod large hole and is connected by a fastening screw.

5. The connecting rod structure of the piston-type high-efficiency compressor according to claim 1, characterized in that: The width of the groove structure is set to 0.3~1mm, the depth is 0.1~0.5mm, and the distance between the groove structure and the inner wall of the connecting rod large hole is 0.8~1.5mm.

6. The connecting rod structure of the piston-type high-efficiency compressor according to claim 1, characterized in that: The mating surface between the connecting rod body and the connecting rod cover is set as a stepped surface, and the inner section of the stepped surface forms a mating gap.

7. The connecting rod structure of the piston-type high-efficiency compressor according to claim 1, characterized in that: A grooved anti-fool block I is provided on the outer side of the end of the connecting rod body away from the small end of the connecting rod, and grooved anti-fool blocks II are respectively provided on the outer sides of both ends of the connecting rod cover to mate with the corresponding grooved anti-fool blocks I.

8. An assembly method for the connecting rod structure of a piston-type high-efficiency compressor as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1: After processing and cleaning, the assembled split connecting rods are sorted in a constant temperature and humidity warehouse to form the connecting rod body and connecting rod cover group of connecting rod large holes; Step 2: Select a piston that matches the cylinder bore clearance. Based on the crankshaft eccentric shaft group, select a split connecting rod that meets the assembly clearance requirements. Select a piston pin that corresponds to the piston pin hole of the small end of the connecting rod. Step 3: Insert the small end of the connecting rod into the piston cavity, pass the piston pin through the piston and insert it into the small end of the connecting rod, and then pass the spring pin laterally through the piston end face and connect it with the piston pin. Assemble the piston pin, piston and connecting rod body together through the spring pin. Step 4: Separate the connecting rod body and connecting rod cap of the split connecting rod, insert the connecting rod body with the piston into the cylinder bore, install the crankshaft in the crankshaft seat, so that the large bore end of the connecting rod body partially surrounds the eccentric end of the crankshaft. Step 5: Ensure that the connecting rod cap is aligned with the end of the connecting rod body that forms the connecting rod bore in the correct assembly direction. Secure the connecting rod cap to the connecting rod body with the fastening screws to surround the crankshaft with the connecting rod bore. Rotate the crankshaft to ensure that the assembled connecting rod operates freely before proceeding to the next assembly step.

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