Piston connecting rod mechanism, compressor and refrigeration equipment

Abstract

The invention discloses a piston connecting rod mechanism, a compressor and refrigeration equipment, the piston connecting rod mechanism comprises a piston and a connecting rod, the connecting rod comprises a connecting rod body, an integrated connecting part and a crankshaft connecting part, the integrated connecting part is integrally formed at one end of the connecting rod body, and the crankshaft connecting part is integrally formed at the other end of the connecting rod body; the integrated connecting part can be in running fit with the piston so as to realize power transmission and circumferential swing guiding of the connecting rod and the piston; the crankshaft connecting part is used for being rotationally matched with a crankshaft to transmit rotating power of the crankshaft. According to the piston connecting rod mechanism, a traditional independent piston pin and an elastic positioning pin are omitted, pin holes do not need to be machined in the piston, the number of parts is reduced, the structure and assembly steps are simplified, the machining complexity and the overall weight of the mechanism are reduced, lightweight design is achieved, a compressor is assisted to develop towards high efficiency, miniaturization and low energy consumption, and the service life of the compressor is prolonged. And the dependence on an independent piston pin is eliminated.

Description

Technical Field

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

[0002] Reciprocating piston compressors are core power units in refrigeration, air compression, and other fields. Their piston-connecting rod mechanism is the core component for power transmission and volume change. Traditionally, this mechanism consists of a piston, connecting rod, independent piston pins, and elastic locating pins. The independent piston pins are used to hinge the connecting rod to the piston, and the elastic locating pins prevent axial movement of the piston pins. This design results in significant structural redundancy in the piston-connecting rod mechanism: to accommodate the independent piston pins, the piston needs specially machined radial pin holes, and the connecting rod needs a corresponding mounting structure, increasing not only the number of parts and machining complexity but also making assembly cumbersome. Simultaneously, the independent piston pins, elastic locating pins, and the reinforcing structures around the pin holes significantly increase the overall weight of the piston-connecting rod mechanism, hindering the development of compressors towards lightweight and high-efficiency designs, and making it difficult to meet current application demands for miniaturized and low-energy-consumption equipment. Therefore, how to reduce reliance on independent piston pins, simplify the piston-connecting rod mechanism's structure, and reduce its weight has become an urgent technical problem to be solved in this field. Summary of the Invention

[0003] The embodiments of the present invention provide a piston connecting rod mechanism, a compressor, and a refrigeration device, which solves the technical problems of complex structure and heavy weight caused by the reliance on independent piston pins and matching fasteners and adaptable structures in traditional piston connecting rod mechanisms.

[0004] To address the aforementioned problems, according to one aspect of this application, an embodiment of the present invention provides a piston-connecting rod mechanism, the piston-connecting rod mechanism including a piston and a connecting rod, the connecting rod including a connecting rod body, an integrated connecting portion, and a crankshaft connecting portion, the integrated connecting portion being integrally formed at one end of the connecting rod body, and the crankshaft connecting portion being integrally formed at the other end of the connecting rod body; the integrated connecting portion is rotatably coupled with the piston to realize power transmission and circumferential oscillation guidance between the connecting rod and the piston; the crankshaft connecting portion is used to rotatably engage with the crankshaft to transmit the rotational power of the crankshaft.

[0005] In some embodiments, the integrated connector has an axially extending through hole inside, and the diameter d of the through hole and the outer diameter D of the integrated connector satisfy d / D=1 / 2-3 / 4.

[0006] In some embodiments, the outer cylindrical surface of the piston is a continuous cylindrical surface, and the piston is provided with a support unit that cooperates with the integrated connection portion.

[0007] In some embodiments, the support unit includes a support groove disposed at the upper end of the piston and a limiting support module disposed at the lower end of the piston. The support groove fits against the upper end surface of the integrated connection part to limit the upward axial displacement of the integrated connection part. The limiting support module cooperates with the lower end of the integrated connection part to limit its downward axial displacement and guide the circumferential swing of the connecting rod.

[0008] In some embodiments, the limiting support module includes a limiting boss extending circumferentially along the inner wall of the piston and a guide rail with an inwardly concave arc shape, wherein the limiting boss abuts against the lower end face of the integrated connection portion.

[0009] In some embodiments, the lower end of the integrated connection portion is provided with a support portion, which is in close sliding fit with the guide rail.

[0010] In some embodiments, the support portion is a hemispherical structure, and the guide rail is a hemispherical concave structure adapted to the support portion.

[0011] In some embodiments, the connecting rod has an inclined oil passage that runs through the connecting rod body. One end of the inclined oil passage is connected to the crankshaft connection portion, and the other end extends to the integrated connection portion, for guiding lubricating oil from the crankshaft connection portion to the integrated connection portion.

[0012] In some embodiments, the outer peripheral surface of the integrated connection is provided with an oil leakage hole, which is connected to an inclined oil passage for discharging lubricating oil to the mating surface of the piston and cylinder.

[0013] According to another aspect of this application, an embodiment of the present invention provides a compressor, including a compressor body, a cylinder seat, a crankshaft, and a piston connecting rod mechanism as described above. The cylinder seat is disposed on the compressor body and has a continuous cylindrical cylinder bore. The piston is slidably engaged with the inner wall of the cylinder bore, and the short shaft of the crankshaft is rotatably engaged with the crankshaft connecting portion.

[0014] In some embodiments, the outer wall of the long axis of the crankshaft is provided with a helical groove.

[0015] According to another aspect of this application, an embodiment of the present invention provides a refrigeration device, the refrigeration device including the compressor described above.

[0016] Compared with the prior art, the piston connecting rod mechanism of the present invention has at least the following beneficial effects: The piston-connecting rod mechanism provided by the present invention includes a piston and a connecting rod. The connecting rod includes a connecting rod body, an integrated connecting portion, and a crankshaft connecting portion. The integrated connecting portion is integrally formed at one end of the connecting rod body, and the crankshaft connecting portion is integrally formed at the other end of the connecting rod body. The integrated connecting portion can rotate with the piston to realize the power transmission and circumferential oscillation guidance between the connecting rod and the piston. The crankshaft connecting portion is used to rotate with the crankshaft to transmit the rotational power of the crankshaft.

[0017] In this invention, the integrated connecting part, connecting rod body, and crankshaft connecting part of the connecting rod adopt an integral molding structure, eliminating the independent piston pin in the traditional design. Simultaneously, the integrated connecting part directly rotates with the piston, eliminating the need to machine radial pin holes on the piston for mounting the piston pin, and also eliminating the need for fixed components such as elastic locating pins. This design firstly reduces the number of parts. Previously, multiple parts such as the piston, connecting rod, piston pin, and elastic locating pin were required; now, through the direct engagement of the integrated connecting part with the piston and the integral molding of the connecting rod, the piston pin and elastic locating pin are eliminated, simplifying the overall structure. Secondly, reducing the number of parts also reduces processing complexity. The elimination of the need to machine pin holes and mounting structures to accommodate piston pins simplifies assembly steps and avoids the assembly and debugging of multiple parts. Furthermore, the integrally molded connecting rod and the elimination of additional fixed components significantly reduce the overall weight of the piston-connecting rod mechanism, freeing it from the weight burden of traditional pin hole periphery reinforcement structures and additional locating components, thus achieving lightweight design. This helps the compressor develop towards higher efficiency, smaller size, and lower energy consumption, ultimately eliminating the dependence on independent piston pins.

[0018] The compressor provided by this invention is designed based on the aforementioned piston-connecting rod mechanism. Its beneficial effects are described in the same manner as those of the piston-connecting rod mechanism, and will not be repeated here. The refrigeration equipment provided by this invention is designed based on the above-mentioned compressor, and its beneficial effects are the same as those of the compressor, which will not be repeated here.

[0019] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1An exploded view of a piston-connecting rod mechanism provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the piston structure in a piston-connecting rod mechanism provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of a piston at another angle in a piston-connecting rod mechanism provided in an embodiment of the present invention; Figure 4 A cross-sectional view of a piston in a piston-connecting rod mechanism provided in an embodiment of the present invention; Figure 5 A cross-sectional view of a piston-connecting rod mechanism provided in an embodiment of the present invention; Figure 6 for Figure 5 A magnified view of a section at point A in the middle; Figure 7 This is a schematic diagram of the structure of a compressor in which the cylinder seat and the piston connecting rod mechanism cooperate, provided by an embodiment of the present invention. Figure 8 This is a schematic diagram of the structure of a cylinder base in a compressor provided by an embodiment of the present invention; Figure 9 A cross-sectional view of the crankshaft and piston connecting rod mechanism in a compressor provided in an embodiment of the present invention; Figure 10 This is an exploded view of a traditional piston-connecting rod mechanism; Figure 11 This is a schematic diagram of the traditional piston-connecting rod mechanism and its connection with the cylinder seat. Figure 12 This is a schematic diagram of a traditional cylinder block structure; Figure label explanation: 1. Piston; 11. Support unit; 111. Support groove; 112. Limiting support module; 1121. Limiting boss; 1122. Guide slide rail; 2. Connecting rod; 21. Connecting rod body; 22. Integrated connection part; 221. Through hole; 222. Support part; 223. Oil leakage hole; 23. Crankshaft connection part; 24. Inclined oil passage; 3. Cylinder seat; 31. Cylinder bore; 4. Crankshaft; 5. Piston pin; 6. Elastic locating pin. Detailed Implementation

[0022] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific embodiments, structures, features, and effects according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0023] In the description of this invention, it should be clearly stated that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," "horizontal," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are merely for the convenience of describing this invention, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this invention.

[0024] 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.

[0025] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0026] Example 1 This embodiment provides a piston-connecting rod mechanism, such as... Figures 1-6 As shown, the piston-connecting rod mechanism includes a piston 1 and a connecting rod 2. The connecting rod 2 includes a connecting rod body 21, an integrated connecting part 22, and a crankshaft connecting part 23. The integrated connecting part 22 is integrally formed at one end of the connecting rod body 21, and the crankshaft connecting part 23 is integrally formed at the other end of the connecting rod body 21. The integrated connecting part 22 can rotate with the piston 1 to realize the power transmission and circumferential swing guidance between the connecting rod 2 and the piston 1. The crankshaft connecting part 23 is used to rotate with the crankshaft to transmit the rotational power of the crankshaft.

[0027] The integrated connecting part 22 is embedded inside the piston 1, the connecting rod body 21 extends outward from inside the piston 1, and the crankshaft connecting part 23 is located at the end of the connecting rod body 21 away from the integrated connecting part 22 and outside the piston 1. More specifically, the integrated connecting part 22 is integrally formed at one end of the connecting rod body 21, extending entirely into the internal space of the piston 1, and forming a rotational fit with the inside of the piston 1 through its outer surface. This embedded positional relationship allows the two to stably transmit power. The connecting rod body 21, as an intermediate carrier for power transmission, receives the power from the integrated connecting part 22 and transmits it to the crankshaft connecting part 23, while providing a stable connection support for the integrated connecting part 22 and the crankshaft connecting part 23. The crankshaft connecting part 23 is integrally formed at the other end of the connecting rod body 21, and its function is to establish a rotational connection with the external crankshaft, converting the swinging power of the connecting rod 2 into the rotational power of the crankshaft, thereby realizing the outward output of power. The function of piston 1 is to receive the power of connecting rod 2 through cooperation with integrated connecting part 22 and convert it into its own reciprocating linear motion, while providing the supporting foundation required for the rotation of integrated connecting part 22, and ensuring the stability of the power transmission process.

[0028] The working relationship between piston 1 and connecting rod 2 revolves around power transmission and motion mode conversion. Specifically, crankshaft connection 23 first forms a rotational engagement with the external crankshaft. When the crankshaft rotates, it will drive crankshaft connection 23 to make a circular oscillation. The oscillation of crankshaft connection 23 is transmitted to integrated connection 22 through connecting rod body 21. Since the integrated connecting part 22 maintains a rotational engagement with the piston 1, the oscillating power transmitted from the connecting rod body 21 drives the integrated connecting part 22 to rotate inside the piston 1. Furthermore, the rotation of the integrated connecting part 22 is converted into a power that pushes the piston 1 to perform reciprocating linear motion, enabling the piston 1 to move stably along the inner wall of the cylinder. Conversely, when the piston 1 is subjected to an external force and performs reciprocating linear motion, it will drive the integrated connecting part 22 to rotate through the rotational engagement with the integrated connecting part 22 inside the piston. The rotation of the integrated connecting part 22 is transmitted to the crankshaft connecting part 23 through the connecting rod body 21, pushing the crankshaft connecting part 23 to drive the crankshaft to rotate, thereby realizing the mutual conversion between reciprocating linear motion and rotational motion, ensuring the smooth and efficient transmission of the entire power.

[0029] The technical problem in traditional technology is that the piston connecting rod mechanism relies on an independent piston pin 5 and a flexible locating pin 6, such as Figures 10-12As shown, this results in a large number of parts, cumbersome processing and assembly, and a large overall weight, which restricts the development of lightweight and high-efficiency design. In this embodiment, the piston 1 and connecting rod 2 solve this problem through an integrated molding design. Specifically, the integrated connecting part 22, the connecting rod body 21, and the crankshaft connecting part 23 of the connecting rod 2 adopt an integrated molding structure, eliminating the independent piston pin 5 in the traditional design. At the same time, the integrated connecting part 22 directly forms a rotational fit with the piston 1, eliminating the need to machine radial pin holes on the piston 1 for installing the piston pin 5, and eliminating the need to set up fixing components such as elastic positioning pins 6. This design firstly reduces the number of parts. Previously, multiple parts such as piston 1, connecting rod 2, piston pin 5, and elastic locating pin 6 were required. Now, through the direct engagement of the integrated connecting part 22 with piston 1 and the integrated molding of connecting rod 2, the piston pin and elastic locating pin are eliminated, simplifying the overall structure. Secondly, reducing the number of parts also lowers processing complexity. The elimination of the need for machining pin holes and mounting structures to accommodate piston pins simplifies assembly steps and avoids the need for assembling and debugging multiple parts. Furthermore, the integrated molding of connecting rod 2 and the elimination of additional fixing components significantly reduce the overall weight of the piston-connecting rod mechanism. It is no longer burdened by the weight of traditional pin hole reinforcement structures and additional locating components, thus achieving lightweight design. This helps the compressor develop towards higher efficiency, smaller size, and lower energy consumption, ultimately eliminating the reliance on independent piston pins.

[0030] In a specific embodiment, the integrated connection part 22 has an axially extending through hole 221 inside, and the diameter d of the through hole 221 and the outer diameter D of the integrated connection part 22 satisfy d / D=1 / 2-3 / 4.

[0031] The through hole 221 inside the integrated connecting part 22 extends axially through the entire integrated connecting part 22, making the integrated connecting part 22 have a hollow structure. This structural arrangement can significantly reduce the overall weight of the connecting rod 2, making the connecting rod 2 lighter while maintaining structural strength. More specifically, the diameter d of the through hole 221 is kept in a ratio range of 1 / 2 to 3 / 4 with the outer diameter D of the integrated connecting part 22. This ratio design ensures that the integrated connecting part 22 has sufficient wall thickness to withstand the power transmitted by the piston 1 and the impact of reciprocating motion, while avoiding unnecessary weight increase due to excessive wall thickness, thus achieving a good balance between strength and lightness. Furthermore, this hollow structure can also reduce inertial force during the movement of the connecting rod 2, making the movement of the piston connecting rod mechanism more flexible and helping to improve the overall efficiency of the compressor. At the same time, the reasonable hole diameter ratio is also conducive to processing and manufacturing, making the integrated connecting part 22 less prone to defects during the molding process, ensuring the structural stability and reliability of the connecting rod 2.

[0032] In a specific embodiment, the outer cylindrical surface of the piston 1 is a continuous cylindrical surface, and the piston 1 is provided with a support unit 11 that cooperates with the integrated connection part 22.

[0033] The outer cylindrical surface of piston 1 is a continuous cylindrical surface, which means that the outer wall of piston 1 no longer needs to be drilled with radial pin holes for installing piston pins, nor does it need to be equipped with additional reinforcing structures around the pin holes. This makes the shape of piston 1 more complete and simplifies the machining steps. More specifically, the design of the continuous cylindrical surface also makes the piston 1 slide more smoothly in the cylinder, reducing the risk of wear or jamming caused by structural discontinuity, and helping to improve the overall reliability of the piston connecting rod mechanism.

[0034] Furthermore, the support unit 11 inside the piston 1 cooperates with the integrated connecting part 22 to provide a stable support foundation for the integrated connecting part 22, enabling the integrated connecting part 22 to rotate inside the piston 1, thereby completing power transmission and motion guidance. The presence of the support unit 11 makes the fit between the piston 1 and the integrated connecting part 22 tighter, no longer relying on the traditional piston pin structure, and further simplifies the connection method between the piston 1 and the connecting rod 2, making the entire piston connecting rod mechanism more compact and lighter, while also improving assembly efficiency.

[0035] In a specific embodiment, the support unit 11 includes a support groove 111 disposed at the upper end of the piston 1 and a limiting support module 112 disposed at the lower end of the piston 1. The support groove 111 fits against the upper end surface of the integrated connection part 22 to limit the upward axial displacement of the integrated connection part 22. The limiting support module 112 cooperates with the lower end of the integrated connection part 22 to limit its downward axial displacement and guide the connecting rod 2 to swing circumferentially.

[0036] Both the support groove 111 and the limiting support module 112 are disposed inside the piston 1, and together they cooperate with the integrated connecting part 22. The support groove 111 is located at the upper end of the piston 1, and its inner wall is directly attached to the upper end surface of the integrated connecting part 22. This attachment relationship limits the integrated connecting part 22 upward. The limiting support module 112 is located at the lower end of the piston 1, and its entire body is in contact with the lower end of the integrated connecting part 22, thereby limiting the integrated connecting part 22 downward. After the upper and lower ends of the integrated connecting part 22 are respectively limited by the support groove 111 and the limiting support module 112, it can be stably positioned in the preset position inside the piston 1. At the same time, the integrated connecting part 22 can rotate within the cooperation range of the support groove 111 and the limiting support module 112, thereby driving the connecting rod 2 to achieve circumferential swing. The connecting rod body 21 of the connecting rod 2 receives the power of the integrated connecting part 22 and transmits it to the crankshaft connecting part 23. The entire cooperation process does not require additional positioning components. Stable power transmission and motion guidance can be achieved simply by the direct cooperation between the support groove 111 and the limiting support module 112 inside the piston 1 and the integrated connecting part 22.

[0037] The support groove 111 and the limiting support module 112 provide bidirectional axial limiting for the integrated connecting part 22, preventing it from moving up and down inside the piston 1 and ensuring the stability of the fit between the integrated connecting part 22 and the piston 1. More specifically, this bidirectional limiting ensures that the rotation of the integrated connecting part 22 remains within a preset range, making the circumferential swing of the connecting rod 2 smoother, improving the accuracy of power transmission in the entire piston-connecting rod mechanism, and preventing power transmission deviation or loss due to the movement of the integrated connecting part 22. Furthermore, since the fit between the two does not require additional components such as traditional elastic locating pins, the number of parts in the piston-connecting rod mechanism is further reduced, and the structure is simplified. This not only reduces the difficulty of processing and assembly but also reduces the overall weight of the mechanism. At the same time, the stable fit also reduces wear between the integrated connecting part 22 and the piston 1, extending the service life of the components.

[0038] In a specific embodiment, the limiting support module 112 includes a limiting boss 1121 extending circumferentially along the inner wall of the piston 1 and a guide rail 1122 in the shape of an inwardly concave arc. The limiting boss 1121 abuts against the lower end face of the integrated connection part 22.

[0039] The limiting boss 1121 extends circumferentially along the inner wall of the piston, and its upper end face directly abuts against the lower end face of the integrated connector. The guide rail 1122 is located on the outer periphery of the limiting boss 1121, and the concave arc-shaped surface of the guide rail 1122 faces the integrated connector. Furthermore, the lower end of the integrated connector contacts both the limiting boss 1121 and the guide rail 1122. The limiting boss 1121 supports the integrated connector from below, while the guide rail 1122 conforms to the side of the integrated connector. Together with the support groove inside the piston, they confine the integrated connector to a suitable position inside the piston, while also providing a supporting foundation for the rotation of the integrated connector.

[0040] The limiting boss 1121 and the guide rail 1122 work together to achieve stable limiting and guiding functions. Specifically, the limiting boss 1121, through its abutting engagement with the lower end face of the integrated connecting part, restricts the downward axial displacement of the integrated connecting part. The guide rail 1122, through its concave arc-shaped surface and its fit with the side of the integrated connecting part, guides the integrated connecting part to rotate smoothly along an arc-shaped trajectory. This cooperation effectively prevents the integrated connecting part from shifting or wobbling during rotation, allowing for smoother circumferential swinging of the connecting part and the connecting rod. Furthermore, the synergistic cooperation of the two not only strengthens the bidirectional limiting effect on the integrated connecting part and, together with the support groove, achieves upper and lower limiting, but also improves the stability and accuracy of power transmission between the piston and the connecting rod. At the same time, it eliminates the need for additional positioning or guiding components, further simplifying the overall structure of the piston-connecting rod mechanism, reducing the number of parts, lowering the difficulty of processing and assembly, and reducing the weight of the mechanism, thus ensuring the long-term reliability of the entire piston-connecting rod mechanism.

[0041] In a specific embodiment, the lower end of the integrated connection part 22 is provided with a support part 222, and the support part 222 is in close sliding cooperation with the guide slide rail 1122.

[0042] A support portion 222 is provided at the lower end of the integrated connecting part 22, corresponding to the guide slide rail 1122. The support portion 222 is a structure directly formed at the lower end of the integrated connecting part 22. Its outer surface can completely fit the concave arc surface of the guide slide rail 1122. More specifically, when the integrated connecting part 22 rotates inside the piston 1, the support portion 222 will slide along the arc trajectory of the guide slide rail 1122. This fitting and sliding cooperation makes the rotation process of the integrated connecting part 22 more stable and prevents deviation or jamming. The support portion 222 not only receives the power transmitted from the integrated connecting part 22, but also restricts its own movement trajectory through cooperation with the guide slide rail 1122. This makes the direction of power transmission more precise when the integrated connecting part 22 drives the connecting rod body 21 to swing circumferentially, and also makes the cooperation between the integrated connecting part 22 and the piston 1 tighter.

[0043] In a specific embodiment, the support portion 222 is a hemispherical structure, and the guide rail 1122 is a hemispherical concave structure adapted to the support portion 222.

[0044] The support portion 222 is designed as a hemispherical structure, giving its outer surface a smooth, curved contour. The guide rail 1122, correspondingly, is a hemispherical concave structure, with its concave curvature perfectly matching the convex curvature of the support portion 222, thus perfectly fitting and enveloping the curved outer surface of the support portion 222. More specifically, when the integrated connecting portion 22 rotates the support portion 222, the hemispherical support portion 222 can slide smoothly along the surface of the hemispherical concave guide rail 1122, preventing uneven local force distribution. This matching shape ensures a more uniform contact area and a smoother contact process. Furthermore, the hemispherical fit allows the rotation trajectory of the support 222 to be precisely limited within the range of the guide rail 1122, ensuring that it does not deviate from the preset direction of movement or produce excessive wobbling. This makes the rotation of the integrated connection 22 smoother and the circumferential swing of the connecting rod 2 more stable. At the same time, the uniform contact also reduces wear between the support 222 and the guide rail 1122, extending the service life of these two components and reducing the need for frequent replacements. This also makes the operation of the entire piston-connecting rod mechanism more reliable.

[0045] In a specific embodiment, the connecting rod 2 is provided with an inclined oil passage 24 that runs through the connecting rod body 21. One end of the inclined oil passage 24 is connected to the crankshaft connection part 23, and the other end extends to the integrated connection part 22, which is used to guide lubricating oil from the crankshaft connection part 23 to the integrated connection part 22.

[0046] An inclined oil passage 24 runs through the interior of the connecting rod body 21. It is not arranged in a straight line along the center of the connecting rod body 21, but extends inclinedly from the crankshaft connection 23 side to the integrated connection 22 side. This inclined direction allows the lubricating oil to flow more naturally to the parts that need lubrication during the movement of the connecting rod 2. More specifically, one end of the inclined oil passage 24 is located near the area where the crankshaft connection 23 mates with the crankshaft. In this way, when the crankshaft rotates and brings lubricating oil, the oil can directly enter the inclined oil passage 24. The other end of the inclined oil passage 24 extends into the interior of the integrated connection 22, so that the lubricating oil can be delivered to the position where the integrated connection 22 mates with the piston 1. Furthermore, since the inclined oil passage 24 is through-type, the lubricating oil will not be subject to additional obstruction when flowing inside, and can smoothly reach the integrated connection 22 from the crankshaft connection 23, thereby achieving continuous lubrication of these two key mating parts, ensuring that the connecting rod 2 maintains a flexible movement state during operation, and reducing wear caused by friction.

[0047] In a specific embodiment, the outer peripheral surface of the integrated connection part 22 is provided with an oil leakage hole 223, which is connected to the inclined oil passage 24 and is used to guide lubricating oil to the mating surface of the piston 1 and the cylinder.

[0048] The oil drain hole 223 is located on the outer peripheral surface of the integrated connecting part 22, precisely near the area where the integrated connecting part 22 mates with the interior of the piston 1. This design allows the lubricating oil flowing from the inclined oil passage 24 to flow smoothly outwards after reaching the integrated connecting part 22. More specifically, the oil drain hole 223 is connected to the inclined oil passage 24, allowing the lubricating oil to naturally seep outwards through the drain hole 223 after entering the inclined oil passage 24 and flowing to the integrated connecting part 22. The seeping lubricating oil then flows along the outer surface of the integrated connecting part 22, eventually reaching the mating surface between the piston 1 and the cylinder. Furthermore, since the piston 1 performs reciprocating linear motion within the cylinder, continuous lubrication is required to reduce friction and wear. The oil drain hole 223 precisely meets this requirement, ensuring that lubricating oil continuously replenishes the contact area between the piston 1 and the cylinder during the operation of the piston-connecting rod mechanism, thereby guaranteeing smoother piston movement.

[0049] The working process of the piston connecting rod mechanism provided in this embodiment revolves around power transmission and motion mode conversion, while achieving stable operation and precise lubrication through its own structure. At the start of operation, the crankshaft connecting part 23 forms a rotational engagement with the external crankshaft. When the crankshaft rotates, it will drive the crankshaft connecting part 23 to circumferentially swing. The swinging power of the crankshaft connecting part 23 is transmitted to the integrated connecting part 22 through the integrally formed connecting rod body 21. The integrated connecting part 22 is embedded inside the piston 1. Its upper and lower ends respectively cooperate with the support groove 111 and the limiting support module 112 inside the piston 1. The support groove 111 fits against the upper end surface of the integrated connecting part 22 to restrict its upward movement. The limiting boss 1121 in the limiting support module 112 abuts against the lower end surface of the integrated connecting part 22 to restrict its downward displacement. The hemispherical support part 222 at the lower end of the integrated connecting part 22 fits against the hemispherical concave guide rail 1122 on the outer periphery of the limiting support module 112 and slides, so that the integrated connecting part 22 can rotate smoothly inside the piston 1 without deviation. This stable cooperation relationship allows the integrated connecting part 22 to convert the swinging power of the connecting rod 2 into the thrust that pushes the piston 1 to reciprocate linearly along the cylinder. Throughout the entire operation, the lubrication system functions synchronously. Lubricating oil generated during crankshaft rotation enters the inclined oil passage 24, which connects to the crankshaft connection 23. The inclined oil passage 24 passes through the connecting rod body 21 and extends to the integrated connection 22. The lubricating oil flows smoothly along the inclined oil passage 24 to the integrated connection 22, lubricating the mating parts between the integrated connection 22 and the piston 1, reducing friction during relative rotation. Simultaneously, the lubricating oil seeps out through the oil leakage holes 223 on the outer circumference of the integrated connection 22, flowing to the mating surfaces of the piston 1 and the cylinder, providing lubrication for the reciprocating linear motion of the piston 1. At the same time, the through-hole 221 inside the integrated connection 22 reduces the weight of the connecting rod 2 while maintaining structural strength, making the entire mechanism more flexible and power transmission more efficient. The entire operation eliminates the need for traditional piston pins 5 and elastic positioning pins 6; stable power transmission and motion conversion are achieved solely through the integrated molding and precise fit of each component. Furthermore, the built-in lubrication structure ensures long-term reliable operation of the mechanism.

[0050] Example 2 This embodiment provides a compressor, such as Figures 7-9 As shown, the system includes a compressor body, a cylinder seat 3, a crankshaft 4, and the piston connecting rod mechanism described in Embodiment 1. The cylinder seat 3 is mounted on the compressor body and has a continuous cylindrical cylinder bore 31. The piston 1 slides in contact with the inner wall of the cylinder bore 31, and the short shaft of the crankshaft 4 rotates in contact with the crankshaft connecting part 23.

[0051] The cylinder seat 3 is mounted on the compressor body. The cylinder bore 31 inside the cylinder seat 3 is a continuous cylinder. This continuous cylindrical surface provides a stable sliding track for the piston 1, allowing the piston 1 to perform smooth reciprocating linear motion inside the cylinder bore 31. More specifically, the piston 1 maintains a good fit with the inner wall of the cylinder bore 31, ensuring the smoothness of the piston 1's movement and providing a basic condition for the sealing of the compression chamber. The cooperation between the piston 1 and the integrated connection part 22 allows the piston 1 to convert the power transmitted from the connecting rod 2 into its own reciprocating motion. Furthermore, the crankshaft 4 is mounted on the compressor body and can rotate freely. The short shaft of the crankshaft 4 maintains a rotational fit with the crankshaft connection part 23 of the connecting rod 2. This fit allows the crankshaft 4 to drive the connecting rod 2 to swing when it rotates. The swing of the connecting rod 2 is then transmitted to the piston 1 through the integrated connection part 22, pushing the piston 1 to perform reciprocating linear motion inside the cylinder bore 31, thereby realizing the intake, compression, and discharge of gas.

[0052] In a specific embodiment, the outer wall of the long shaft of the crankshaft 4 is provided with a spiral groove.

[0053] The spiral grooves on the outer wall of the long shaft of crankshaft 4 serve to guide lubricating oil to the mating area between the short shaft and crankshaft connection 23, providing continuous lubrication for the critical parts of the power transmission system. More specifically, as crankshaft 4 rotates, the spiral grooves create a "conveyor" effect, drawing lubricating oil upwards from the bottom of the compressor or other areas. This allows the lubricating oil to flow smoothly along the spiral grooves, preventing it from accumulating at the bottom and failing to reach the mating parts. Furthermore, the lubricating oil guided by the spiral grooves eventually flows to the short shaft of the crankshaft 4, which maintains a rotational fit with the crankshaft connection 23 of the connecting rod 2. This lubricating oil directly enters the fit clearance between the two, reducing friction and wear during relative rotation. At the same time, some of the lubricating oil also enters the inclined oil passage 24 connected to the crankshaft connection 23, and continues to flow to the integrated connection 22 through the inclined oil passage 24, thereby lubricating the mating part between the integrated connection 22 and the piston 1. Throughout the process, the spiral grooves provide a dedicated flow channel for the lubricating oil, ensuring that the lubricating oil can accurately and smoothly reach the key parts inside the compressor that require lubrication, ensuring smooth operation of all components, and improving the overall operational stability and service life of the compressor.

[0054] Example 3 This embodiment provides a refrigeration device, including the compressor described in Embodiment 2.

[0055] The refrigeration equipment provided in this embodiment uses the compressor described in Embodiment 2 as its core refrigeration power. As a key power component of the refrigeration equipment, the compressor works in conjunction with other internal components to achieve the refrigeration function. More specifically, during operation, the compressor, through the cooperation of its internal piston-connecting rod mechanism, cylinder seat 3, crankshaft 4, and other components, compresses the intake low-temperature, low-pressure refrigerant gas, converting it into high-temperature, high-pressure refrigerant gas, providing initial power for the refrigeration cycle. Furthermore, the compressor in Embodiment 2 features a simplified structure, lighter weight, and stable operation. Its internal piston-connecting rod mechanism eliminates the traditional independent piston pin and elastic locating pin, achieving precise lubrication through the continuous cylindrical cylinder bore 31 and the spiral grooves on the outer wall of the crankshaft 4's long shaft. This makes the compressor more efficient and consumes less energy during operation. Applying such a compressor to refrigeration equipment improves the overall performance of the equipment, ensuring stable refrigeration output to meet daily refrigeration needs. Furthermore, the compressor's lightweight and high-efficiency advantages reduce overall energy consumption and enhance reliability during use.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A piston-connecting rod mechanism, characterized in that, The piston-connecting rod mechanism includes a piston and a connecting rod. The connecting rod includes a connecting rod body, an integrated connecting portion, and a crankshaft connecting portion. The integrated connecting portion is integrally formed at one end of the connecting rod body, and the crankshaft connecting portion is integrally formed at the other end of the connecting rod body. The integrated connecting portion can rotate with the piston to realize the power transmission and circumferential oscillation guidance between the connecting rod and the piston. The crankshaft connecting portion is used to rotate with the crankshaft to transmit the rotational power of the crankshaft.

2. The piston connecting rod mechanism according to claim 1, characterized in that, The integrated connector has an axially extending through hole inside, and the diameter d of the through hole and the outer diameter D of the integrated connector satisfy d / D=1 / 2-3 / 4.

3. The piston connecting rod mechanism according to claim 1, characterized in that, The outer cylindrical surface of the piston is a continuous cylindrical surface, and the piston is provided with a support unit that cooperates with the integrated connection part.

4. The piston connecting rod mechanism according to claim 3, characterized in that, The support unit includes a support groove at the upper end of the piston and a limiting support module at the lower end of the piston. The support groove fits against the upper surface of the integrated connection part to limit the upward axial displacement of the integrated connection part. The limiting support module cooperates with the lower end of the integrated connection part to limit its downward axial displacement and guide the circumferential swing of the connecting rod.

5. The piston connecting rod mechanism according to claim 4, characterized in that, The limiting support module includes a limiting boss extending circumferentially along the inner wall of the piston and a guide rail with an inwardly concave arc shape. The limiting boss abuts against the lower end face of the integrated connection part.

6. The piston connecting rod mechanism according to claim 5, characterized in that, The lower end of the integrated connection part is provided with a support part, which is in close sliding fit with the guide rail.

7. The piston connecting rod mechanism according to claim 6, characterized in that, The support part is a hemispherical structure, and the guide rail is a hemispherical concave structure adapted to the support part.

8. The piston connecting rod mechanism according to claim 1, characterized in that, The connecting rod has an inclined oil passage that runs through the connecting rod body. One end of the inclined oil passage is connected to the crankshaft connection part, and the other end extends to the integrated connection part, which is used to guide the lubricating oil from the crankshaft connection part to the integrated connection part.

9. The piston connecting rod mechanism according to claim 8, characterized in that, The outer peripheral surface of the integrated connection part is provided with an oil leakage hole, which is connected to the inclined oil passage and is used to guide lubricating oil to the mating surface of the piston and cylinder.

10. A compressor, characterized in that, The compressor includes a compressor body, a cylinder seat, a crankshaft, and a piston connecting rod mechanism as described in any one of claims 1-9. The cylinder seat is disposed on the compressor body and has a continuous cylindrical cylinder bore. The piston slides in contact with the inner wall of the cylinder bore, and the short shaft of the crankshaft rotates in contact with the crankshaft connecting portion.

11. The compressor according to claim 10, characterized in that, The crankshaft has a spiral groove on the outer wall of its long axis.

12. A refrigeration device, characterized in that, The refrigeration equipment includes the compressor described in claim 10 or 11.

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