A piston connecting rod assembly

Abstract

The present invention relates to the technical field of piston compressors, and more specifically, to a piston-connecting rod assembly. The piston and the connecting rod are connected by a piston hook and a small end of the connecting rod; that is, the cylinder seat does not need a U-groove structure, and components such as the piston pin and the elastic locating pin are eliminated, while the length of the connecting rod is not reduced. Through these structures, it is possible to improve the performance of the compressor, reduce the noise of the compressor, and reduce processing costs. A piston hook made of a material with a certain elasticity is used to nest it on the small end of the connecting rod; the U-groove, piston pin, elastic locating pin and other structures are eliminated, the sealing area of ​​the piston is increased, the reciprocating motion mass of the piston connecting rod is reduced, and the noise reduction and cost reduction effects are achieved at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of piston compressors, and more particularly, to a piston connecting rod assembly. Background Art

[0002] In the existing refrigerator piston compressor industry, the compressor's motor drives the crankshaft, which in turn reciprocates through the eccentric shaft of the crankshaft, driving the piston and connecting rod to achieve the intake, compression, expansion, and exhaust processes. With improved living standards, people are increasingly demanding refrigerator noise and energy efficiency. However, in a typical piston-connecting rod structure, the assembly of the piston and connecting rod requires components such as a piston pin and elastic locating pins. The overall mass of the piston and connecting rod is high, resulting in significant reciprocating inertia, which results in high compressor noise. Furthermore, the U-groove structure in the cylinder block for mounting the piston pin can cause burrs and slight deformation on the machined edge of the cylinder bore, impacting the compressor's energy efficiency.

[0003] Patent CN202110710869.5 proposes a new piston-connecting rod structure for a reciprocating compressor. This structure connects the first and second connecting rod sections through a segmented structure, eliminating the piston pin, elastic locating pin, and the U-groove structure on the cylinder seat. However, the segmented connecting rod reduces the connecting rod's lever arm, exerting a certain amount of force on the cylinder bore during operation, leading to wear and jamming. This patent design, however, connects the piston and connecting rod through a piston hook and the small end of the connecting rod. This eliminates the need for a U-groove structure in the cylinder seat, eliminating components such as the piston pin and elastic locating pin, while maintaining the length of the connecting rod. These structures can improve compressor performance, reduce compressor noise, and reduce processing costs. Summary of the Invention

[0004] In view of this, the present invention provides a piston-connecting rod assembly; the U-shaped groove, piston pin, elastic positioning pin and other structures are eliminated, the sealing area of ​​the piston is increased, the reciprocating motion mass of the piston-connecting rod is reduced, and the noise and cost are reduced. Specifically:

[0005] In a first aspect, the present invention provides a piston-connecting rod assembly, comprising a piston and a connecting rod, wherein the connecting rod comprises a small connecting rod end and a large connecting rod end, and is characterized in that: the piston is provided with a front end and a rear end, and the rear end is provided with a piston hook, and the piston hook is an elastomer, one end of which is connected to the rear end of the piston, and the other end is interference fit with the small connecting rod end.

[0006] The above solution can be further optionally provided with a hook hole on the connecting rod end, and the piston hook is nested in the hook hole on the connecting rod end;

[0007] The connecting rod small end is shrink-fitted onto the connecting rod small end.

[0008] As a further option of the above solution, the piston hook is shaped as a circular ring with an opening, and the diameter of the opening is smaller than the diameter of the hook hole.

[0009] The above solution may further be configured such that the piston hook is nested in the rear end of the piston.

[0010] As a further option of the above solution, a boss is provided at the front end of the piston.

[0011] In a second aspect, the present invention provides a piston compressor comprising the above-mentioned piston-connecting rod assembly;

[0012] The piston compressor comprises a cylinder seat and a crankshaft, wherein the cylinder seat is provided with a cylinder, the piston is slidably provided in the cylinder, the crankshaft is provided with an eccentric shaft portion, and the big end of the connecting rod is sleeved on the eccentric shaft portion of the crankshaft and is interference-fitted with the eccentric shaft portion;

[0013] The piston compressor further includes an upper support member, a lower support member and a plane bearing, and the crankshaft and the cylinder seat are connected via the plane bearing and the upper and lower support members.

[0014] The above solution may further be configured such that a first oil hole is formed on the eccentric shaft, and a second oil hole is formed on the connecting rod, and the first oil hole is connected to the second oil hole.

[0015] The technical effects of the present invention are at least as follows:

[0016] The piston and connecting rod are connected by the piston hook and the small end of the connecting rod; that is, the cylinder seat does not need a U-groove structure, and parts such as the piston pin elastic locating pin are eliminated, while the length of the connecting rod is not reduced. Through these structures, it is possible to improve the performance of the compressor, reduce the noise of the compressor, and reduce processing costs. The sealing area of ​​the piston is increased and the sealing distance is increased; the reciprocating mass of the piston connecting rod is low, and after the U-groove structure at the rear end is eliminated, the overall mass of the cylinder seat is reduced, and the cost is reduced. At the same time, the cylinder seat without a U-groove structure avoids deformation of the cylinder bore caused by tip burrs and stress generated during the processing, which has a certain positive effect on improving part quality and energy efficiency. The sealing distance between the piston and the cylinder seat is effectively improved, which is conducive to preventing leakage and improving the working efficiency of the compressor;

[0017] The piston hook is made of a material with a certain elasticity to achieve the nesting of the piston connecting rod, which is convenient for processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the accompanying drawings. The drawings described below are only some embodiments of the present disclosure, and it is obvious to those skilled in the art that other drawings can be derived from these drawings without inventive effort.

[0019] Figure 1 is a perspective schematic diagram of a connecting rod of an embodiment of a piston-connecting rod assembly of the present invention;

[0020] Figure 2 is a three-dimensional schematic diagram of a piston in an embodiment of a piston-connecting rod assembly of the present invention;

[0021] Figure 3 is a cross-sectional view of a crankshaft connecting rod of an embodiment of a piston connecting rod assembly of the present invention;

[0022] Figure 4 is an exploded view of a three-dimensional pump body assembly of an embodiment of a piston compressor of the present invention;

[0023] Figure 5 is a sectional view of a three-dimensional pump body assembly of an embodiment of a piston compressor of the present invention;

[0024] In the picture:

[0025] 1. Connecting rod; 9. Connecting rod big end; 10. Connecting rod small end; 7. Piston; 11. Piston hook; 12. Boss 2, crankshaft; 6. Cylinder seat; 3. Upper support; 4. Plane bearing; 5. Lower support. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0027] The terms used in the embodiments of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The singular forms "a," "the," and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise. "A plurality" generally includes at least two, but does not exclude the inclusion of at least one.

[0028] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0029] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0030] Conventional piston and connecting rod assembly requires components such as a piston pin and an elastic locating pin. This creates a high mass and significant reciprocating inertia, leading to high compressor noise. Furthermore, the U-shaped groove in the cylinder block for the piston pin creates burrs and minor deformation on the machined edges of the cylinder bore, impacting the compressor's energy efficiency.

[0031] This patented design utilizes a novel piston-connecting rod structure, connecting the piston and connecting rod via a piston hook and connecting rod end. This eliminates the need for a U-groove in the cylinder block and components such as the piston pin and elastic locating pin, while maintaining the same connecting rod length. This structure improves compressor performance, reduces noise, and reduces processing costs.

[0032] Example 1

[0033] Specifically, combined with Figure 1-3 As shown: The piston-connecting rod assembly provided in this embodiment includes a piston 7 and a connecting rod 1. Figure 1 The connecting rod shown in the figure is provided with two ends, one end is a small end 10 of the connecting rod, and the other end is a large end 9 of the connecting rod. Furthermore, the small end 10 of the connecting rod is composed of two symmetrical planes, and a connecting column is provided on the inner surface of the two symmetrical planes to connect the two planes. Furthermore, the diameter of the connecting column is smaller than the diameter of the two planes, thereby forming a circumferential groove, i.e., a hook hole; the large end 9 of the connecting rod is composed of a first cylindrical through hole, and further, the connecting rod is formed with a second oil hole. Further, as Figure 2 The elastic piston 7 shown is provided with a front end and a rear end. Preferably, a boss 12 is provided at the front end of the piston to reduce the clearance volume of the gas; a piston hook is provided at the rear end of the piston. Further, the piston hook 11 is made of a material with a certain elasticity, such as PEEK material, to achieve one-time nesting of the piston connecting rod; the piston hook 11 is nested in the hook hole of the connecting rod small head 10; preferably, the piston hook 11 and the hook hole of the connecting rod small head 10 are nested in a heat-shrink manner; further, the part of the piston hook 11 nested in the hook hole of the connecting rod small head 10 is a slotted ring, and the ring is provided with a center hole. The slot diameter is smaller than the connecting column diameter, and the connecting column diameter is smaller than the center hole diameter. Preferably, the angle of the ring slot can be the other side, so that the piston hook 11 can be nested in the hook hole of the connecting rod small head 10 at any angle.

[0034] Therefore, the new piston-connecting rod structure designed in this patent connects the piston and connecting rod through the piston hook and the connecting rod small end. This eliminates the need for a U-groove structure in the cylinder seat and eliminates components such as the piston pin and elastic locating pin, while maintaining the length of the connecting rod. This structure can solve the following technical problems:

[0035] 1. Increased the sealing distance of the piston movement.

[0036] 2. Reduce the mass of the piston connecting rod mechanism.

[0037] 3. Eliminate piston pin and elastic positioning pin, making installation easier.

[0038] 4. The reciprocating inertia force of the movement is reduced and the noise of the compressor is reduced.

[0039] 5. Reduced processing costs.

[0040] Example 2

[0041] This embodiment provides a piston compressor, including the piston-connecting rod assembly, cylinder base 6, and crankshaft 2 provided in the above embodiment 1. Figure 4 and Figure 5 As shown, the cylinder seat 6 is provided with a cylinder, and the piston 7 is slidably provided in the cylinder. Furthermore, the cylinder seat 6 is provided with a second cylindrical through hole; the crankshaft 2 includes an eccentric shaft portion and a lower end portion, and the lower end portion is interference fit with the second cylindrical through hole; further, a columnar protrusion is provided at the top end of the eccentric shaft portion, and the columnar protrusion is interference fit with the first cylindrical through hole of the connecting rod big end 9; further, the eccentric shaft is formed with a first oil hole for communicating with the second oil hole formed by the connecting rod 1.

[0042] like Figure 4 and Figure 5 As shown, the piston compressor includes an upper support member 3, a lower support member 4 and a plane bearing 5. The upper support member 3, the lower support member 4 and the plane bearing 5 are all provided with a central through hole. The tube passes through the central through hole. The upper support member 3, the plane bearing 5 and the lower support member 46 pass through the crankshaft 2 in sequence and are arranged between the crankshaft 2 and the cylinder seat 6 to stabilize the crankshaft 2 and the cylinder seat 6, while reducing the vibration and noise caused by the piston compressor.

[0043] When the piston compressor is running, the crankshaft 2 rotates to drive the connecting rod 1 and the piston 7 to perform periodic reciprocating motion in the cylinder, achieving the process of suction, compression, expansion and exhaust.

[0044] like Figure 4 and Figure 5 As shown, as the crankshaft 2 rotates, oil is discharged upward along the crankshaft 2 under the action of the spiral oil pump and passes into the oil hole on the eccentric shaft of the crankshaft. The first oil hole on the eccentric shaft can be connected to the second oil hole on the connecting rod, which has a lubricating effect on the connection between the piston and the connecting rod.

[0045] In summary, the piston compressor proposed in this embodiment uses a piston hook 11 made of a certain elastic material, adopts a nested piston connecting rod structure, eliminates difficult-to-install components such as the piston pin elastic locating pin, and reduces the mass of the piston 7 and the connecting rod 1, making installation easier and having a certain optimization effect on the overall noise of the compressor. At the same time, the U-groove structure on the cylinder seat is eliminated, which facilitates the processing of the cylinder seat and increases the sealing distance with the piston. After eliminating the U-groove structure at the rear end, the overall mass of the cylinder seat is reduced and the cost is reduced. At the same time, the cylinder seat without a U-groove structure avoids deformation of the cylinder bore caused by tip burrs and stress generated during the processing process, which has a certain positive effect on improving the quality of parts and energy efficiency. The sealing distance between the piston and the cylinder seat is effectively improved, which is conducive to preventing leakage and improving the working efficiency of the compressor.

[0046] Example 3

[0047] This embodiment provides a refrigerator using the above-mentioned compressor.

[0048] In traditional refrigerator piston compressors, the piston and connecting rod are connected by a piston pin and an elastic locating pin. They are installed into the pump body via a U-groove structure at the front end of the cylinder block. However, the U-groove reduces the sealing distance during reciprocating operation of the piston, and machining the U-groove can cause burrs and stress deformation at the cutting edge. The piston pin and elastic locating pin further complicate the installation of piston compressors. The piston pin groove increases the overall mass of the piston and connecting rod, resulting in high reciprocating inertia during operation, which significantly impacts compressor noise. This patented design utilizes a piston hook end made of a plastic material to seamlessly nest into the connecting rod end at the piston pin location of the original compressor. This one-time nested piston-connecting rod structure eliminates difficult-to-install components such as the piston pin and elastic locating pin, reducing the mass of the piston and connecting rod and significantly reducing overall compressor noise. Furthermore, the U-groove structure on the cylinder block is eliminated, facilitating machining of the cylinder block and increasing the sealing distance with the piston. This achieves the goals of easier installation, noise reduction, and improved efficiency.

[0049] A refrigerator using the compressor of the present invention can improve the performance of the compressor, reduce the noise of the compressor, reduce the energy consumption and noise of the refrigerator, and reduce the processing cost.

[0050] While the exemplary embodiments of the present disclosure have been specifically illustrated and described above, it should be understood that the present disclosure is not limited to the detailed structures, configurations, or implementations described herein; rather, the present disclosure is intended to encompass various modifications and equivalent configurations within the spirit and scope of the appended claims.

Claims

1. A piston-connecting rod assembly, comprising a piston and a connecting rod, wherein the connecting rod comprises a small connecting rod end and a large connecting rod end, characterized in that: The piston is provided with a front end and a rear end, and a piston hook is provided at the rear end thereof. The piston hook is an elastic body, one end of which is connected to the rear end of the piston, and the other end is interference-fitted with the small end of the connecting rod; The connecting rod small end is provided with a hook hole, and the piston hook is nested in the hook hole of the connecting rod small end.

2. The piston-connecting rod assembly according to claim 1, wherein: The connecting rod small end of the piston hook is shrink-fitted onto the connecting rod small end.

3. The piston-connecting rod assembly according to claim 1, characterized in that The part where the piston hook and the small end of the connecting rod are interference fit is a slotted ring, and the diameter of the slot is smaller than the diameter of the hook hole.

4. The piston-connecting rod assembly according to claim 1, wherein: The piston hook is nested in the rear end of the piston.

5. The piston-connecting rod assembly according to any one of claims 1 to 4, characterized in that: The front end of the piston is provided with a boss.

6. A piston compressor, characterized in that: The invention comprises the piston-connecting rod assembly according to any one of claims 1 to 5.

7. The piston compressor according to claim 6, characterized in that The piston compressor includes a cylinder seat and a crankshaft. The cylinder seat is provided with a cylinder. The piston is slidably arranged in the cylinder. The crankshaft is provided with an eccentric shaft portion. The big end of the connecting rod is sleeved on the eccentric shaft portion of the crankshaft and is interference fit with the eccentric shaft portion.

8. The piston compressor according to claim 7, characterized in that The piston compressor further includes an upper support member, a lower support member and a plane bearing, and the crankshaft and the cylinder seat are connected via the plane bearing and the upper and lower support members.

9. The piston compressor according to claim 7, characterized in that The eccentric shaft is formed with a first oil hole, and the connecting rod is formed with a second oil hole, and the first oil hole is communicated with the second oil hole.

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