A wear-resistant compressor piston

Abstract

The present invention relates to the technical field of compressor pistons, and in particular to a wear-resistant compressor piston, comprising a piston body, a piston pin and a bushing, wherein a pin hole penetrating the piston body is opened on the piston body; the bushing is arranged in the pin hole, and the piston pin is rotatably arranged in the bushing; when the piston body descends to inhale gas, a pull-down force-bearing area is formed on the side wall of the pin hole; when the piston body ascends to compress gas, pressure is formed on the side wall of the pin hole to form an upward push-up force-bearing area; the pull-down force-bearing area and the push-up force-bearing area are milled; the bushing is made of copper; an extension part with a shape corresponding to the milling is arranged on the bushing, silicon nitride cylinders are distributed in the extension part, and a ceramic layer is arranged on the side of the bushing; the present invention combines the silicon nitride cylinders with the good ductility of copper, and the inner surface of the extension sleeve bushing utilizes the self-lubricating effect and supporting effect of the silicon nitride cylinders, and extends to the milling part to utilize its supporting effect; the ceramic layer can reflect the accumulated deformation of the bushing, and once it is broken, the maintenance personnel know to replace it.

Description

Technical Field

[0001] The invention relates to the technical field of compressor pistons, and in particular to a wear-resistant compressor piston. Background Art

[0002] A piston compressor is a compressor that relies on the reciprocating motion of a piston to pressurize and transport gas. It is a positive displacement compressor, also known as a "reciprocating piston compressor" or "reciprocating compressor". It is mainly composed of a working chamber, transmission components, a body and auxiliary components. The working chamber is directly used to compress gas and is composed of a cylinder, a cylinder liner, a gas valve, a packing, a piston and a piston rod.

[0003] In order to further improve the efficiency of the compressor, the compressor manufacturer must reduce the wear of the piston during movement and also reduce the resistance between the piston and the piston pin as much as possible. In the existing technology, most of the friction is reduced by lubricating oil. However, due to the inadequate lubrication and the piston pin being the force-bearing point between the piston and the connecting rod, it is difficult to oil and thus not wear-resistant, which in turn causes noise and even deformation and damage of the piston. At the same time, the deformation of the piston can also lead to the source of abnormal vibration. Moreover, this vibration and noise are all judged by the technicians based on experience and there is no standard. Once replacement or maintenance is required, the entire compressor has been damaged. Therefore, there is a need for a wear-resistant compressor piston that can make the piston and the piston pin more wear-resistant and can improve the judgment standard. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a wear-resistant compressor piston which can make the piston and the piston pin more wear-resistant and can improve the judgment standard.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A wear-resistant compressor piston comprises a piston body, a piston pin and two bushings, wherein the piston body is provided with a pin hole penetrating the piston body; the bushing is arranged in the pin hole, and the piston pin is rotatably arranged in the bushing;

[0007] Obtain the area where the piston body forms pressure on the side wall of the pin hole when the piston body moves downward to inhale gas, and mark the area as the pull-down force area; obtain the area where the piston body forms pressure on the side wall of the pin hole when the piston body moves upward to compress gas, and mark the area as the push-up force area;

[0008] The piston body corresponding to the pull-down force area and the push-up force area is milled respectively to obtain a pull-down milling groove and an push-up milling groove, wherein the edge sections of the pull-down milling groove and the push-up milling groove are arc-shaped; the pull-down milling groove and the push-up milling groove are integrated with the pin hole;

[0009] The bushing is made of copper; the bushing is provided with a lower extension and an upper extension in shape corresponding to the pull-down milling groove and the push-up milling groove, and the lower extension and the upper extension cooperate with the arc edge cut surface of the pull-down milling groove and the push-up milling groove to form a larger force-bearing area; a plurality of silicon nitride cylinders are respectively distributed in the upper extension and the lower extension, and the silicon nitride cylinder faces the central axis of the piston pin, and the silicon nitride cylinder is used to enhance the supporting effect of the upper extension and the lower extension, thereby reducing the deformation of the copper bushing under long-term stress; one end of the silicon nitride cylinder corresponding to the inner surface of the bushing is the same arc surface as the inner surface of the bushing and extends to the inner surface of the bushing to achieve support and self-lubrication, and the other end extends to the surface of the pull-down milling groove or the push-up milling groove and fits with the surface of the pull-down milling groove or the push-up milling groove; a ceramic layer and a packaging layer covering the bushing, the upper extension and the lower extension are provided on the side of the bushing facing the outside of the piston body; the ceramic layer is pasted on the side of the bushing, and the packaging layer seals and fixes the ceramic layer; the packaging layer is transparent;

[0010] The wear-resistant compressor piston includes an installation step, which includes: heating the piston body to a predetermined temperature and then keeping it warm; freezing the bushing without the ceramic layer and the packaging layer, and after freezing for a predetermined time, aligning the lower extension part and the upper extension part of the bushing with the pull-down milling groove and the push-up milling groove and then installing them into the piston body, and after the piston body and the bushing return to room temperature, attaching the ceramic layer to the side of the bushing facing the outside of the piston body and packaging the ceramic layer through the packaging layer;

[0011] The wear-resistant compressor piston includes an inspection step, which includes: during inspection, the shape of the ceramic layer is judged through a transparent packaging layer. If the bushing is deformed under force, the ceramic is squeezed to cause the ceramic layer to break, and the bushing is determined to be damaged. The bushing is removed, the pin hole, the pull-down milling groove and the push-up milling groove are cleaned, and the installation step is re-executed; if the ceramic layer is not broken, no action is taken.

[0012] Preferably, a lubricating coating is provided on the inner surface of the bushing.

[0013] Preferably, the lubricating coating is a non-metallic lubricating coating.

[0014] Preferably, the lubricating coating is a graphite coating, a polytetrafluoroethylene coating, a silicon nitride coating, or a diamond film.

[0015] Preferably, the surface of the ceramic layer is mirror-finished.

[0016] Preferably, the encapsulation layer is transparent polyimide.

[0017] Preferably, a ceramic layer and a packaging layer are also provided on a surface of the bushing facing the inside of the piston body.

[0018] Preferably, the inner surface of the pin hole and the outer surface of the piston pin are polished.

[0019] Preferably, after the piston body and the bushing return to room temperature to form an interference fit, the ceramic layer is attached to the side of the bushing facing the outside of the piston body and then encapsulated by the encapsulation layer.

[0020] Preferably, the silicon nitride pillars in the lower extension portion or the upper extension portion are arranged in multiple rows, each row has multiple silicon nitride pillars, and the silicon nitride pillars in adjacent rows are arranged in a staggered manner.

[0021] The beneficial effects of the present invention are as follows: the bushing is made of copper, which has good ductility, and the edge sections of the pull-down milling groove and the push-up milling groove arranged at the lower extension part and the upper extension part are arc-shaped to form a larger force-bearing area, so that the force on the piston body is more uniform, avoiding local excessive force on the piston body to cause cracks or deformation, and the larger force-bearing area can also reduce the deformation of the bushing; in combination with the upper extension part and the lower extension part, a plurality of silicon nitride columns are respectively distributed, and the support effect of the upper extension part and the lower extension part is enhanced by the silicon nitride columns, the inner surface of the extension sleeve bushing utilizes the self-lubricating effect and support effect of the silicon nitride columns, and the extension to the pull-down milling groove and the push-up milling groove utilizes their support effect, which can effectively reduce the excessive deformation of the copper bushing during use and extend the service life of the bushing; through the ceramic layer, it can The accumulated deformation of the bushing can be reflected. When the critical value of deformation is reached, the ceramic layer breaks, which can be seen through the transparent packaging layer during routine maintenance, especially the upper extension part and the lower extension part are broken, which is more obvious. The maintenance personnel can be informed to replace them to ensure the use of the compressor and avoid noise or damage to the compressor. The transparent packaging layer can prevent the broken ceramic layer from entering the compressor and causing problems such as cylinder pulling, thereby ensuring the use of the compressor. The ceramic layer, the packaging layer and the bushing are installed separately, and the bushing is cooled and the piston body is heated to achieve thermal expansion and contraction, thereby improving the installation effect. However, the cooling of the bushing will affect its shape. If the ceramic layer is installed in advance, the change in volume will easily cause the ceramic layer to be directly expanded and broken by the bushing and then fail. Therefore, the function of the ceramic layer can be guaranteed after it returns to room temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A state diagram of a wear-resistant compressor piston when inhaling gas downward according to a specific embodiment of the present invention;

[0023] Figure 2 This is a state diagram of a wear-resistant compressor piston in an upward direction compressing gas according to a specific embodiment of the present invention;

[0024] Figure 3 A schematic diagram of a wear-resistant compressor piston bushing according to a specific embodiment of the present invention;

[0025] Explanation of reference numerals: 1. piston body; 11. pin hole; 2. piston pin; 3. bushing; 31. lower extension; 32. upper extension; 33. silicon nitride cylinder; 34. ceramic layer. DETAILED DESCRIPTION

[0026] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0027] Please refer to Figures 1 to 3 A wear-resistant compressor piston comprises a piston body 1, a piston pin 2 and two bushings 3. The piston body 1 is provided with a pin hole 11 penetrating the piston body 1; the bushing 3 is arranged in the pin hole 11, and the piston pin 2 is rotatably arranged in the bushing 3;

[0028] Obtain the area where the piston body 1 forms pressure on the side wall of the pin hole 11 when the piston body 1 inhales gas downward, and mark the area as the pull-down force area; obtain the area where the piston body 1 forms pressure on the side wall of the pin hole 11 when the piston body 1 compresses gas upward, and mark the area as the push-up force area;

[0029] The piston body 1 corresponding to the pull-down force area and the push-up force area is milled to obtain a pull-down milling groove and an push-up milling groove, respectively, wherein the edge sections of the pull-down milling groove and the push-up milling groove are arc-shaped; the pull-down milling groove and the push-up milling groove are integrated with the pin hole 11;

[0030] The bushing 3 is made of copper; the bushing 3 is provided with a lower extension part 31 and an upper extension part 32 whose shapes correspond to the pull-down milling groove and the push-up milling groove, and the lower extension part and the upper extension part cooperate with the arc edge section of the pull-down milling groove and the push-up milling groove to form a larger force-bearing area; a plurality of silicon nitride columns 33 are respectively distributed in the upper extension part 32 and the lower extension part 31, and the silicon nitride column 33 faces the central axis of the piston pin 2, and the silicon nitride column 33 is used to enhance the supporting effect of the upper extension part 32 and the lower extension part 31, thereby reducing the copper bushing 3 under long-term force. The end of the silicon nitride column 33 corresponding to the inner surface of the bushing 3 is the same arc surface as the inner surface of the bushing 3 and extends to the inner surface of the bushing 3 to achieve support and self-lubrication, and the other end extends to the surface of the pull-down milling groove or the push-up milling groove and fits with the surface of the pull-down milling groove or the push-up milling groove; the side of the bushing 3 facing the outside of the piston body 1 is provided with a ceramic layer 34 and a packaging layer covering the bushing 3, the upper extension part 32 and the lower extension part 31; the ceramic layer 34 is pasted on the side of the bushing 3, and the packaging layer seals and fixes the ceramic layer 34; the packaging layer is transparent;

[0031] The wear-resistant compressor piston includes an installation step, which includes: heating the piston body 1 to a predetermined temperature and then keeping it warm; freezing the bushing 3 that is not installed with the ceramic layer 34 and the packaging layer, and after freezing for a predetermined time, aligning the lower extension 31 and the upper extension 32 of the bushing 3 with the pull-down milling groove and the push-up milling groove and then installing them in the piston body 1, and after the piston body 1 and the bushing are restored to room temperature, attaching the ceramic layer 34 to the side of the bushing 3 facing the outside of the piston body 1 and packaging the ceramic layer 34 through the packaging layer;

[0032] The wear-resistant compressor piston includes an inspection step, which includes: during inspection, the shape of the ceramic layer 34 is judged through a transparent packaging layer. If the bushing 3 is deformed due to force, the ceramic is squeezed to cause the ceramic layer 34 to break, and it is determined that the bushing 3 is damaged. The bushing 3 is removed, the pin hole 11, the pull-down milling groove and the push-up milling groove are cleaned, and the installation step is re-executed; if the ceramic layer 34 is not broken, no action is taken.

[0033] From the above description, it can be known that the bushing 3 is made of copper, which has good ductility. The edge sections of the lower extension part 31 and the upper extension part 32 are arranged in an arc shape to form a larger force-bearing area, so that the force on the piston body 1 is more uniform, and the local excessive force on the piston body 1 is avoided to cause cracks or deformation. The larger force-bearing area can also reduce the deformation of the bushing 3; in combination with the upper extension part 32 and the lower extension part 31, a plurality of silicon nitride columns 33 are distributed respectively, and the silicon nitride columns 33 are used to enhance the supporting effect of the upper extension part 32 and the lower extension part 31. The inner surface of the extension sleeve bushing 3 utilizes the self-lubricating effect and supporting effect of the silicon nitride columns 33, and extends to the pull-down milling groove and the push-up milling groove to utilize their supporting effect. The supporting effect can effectively reduce the excessive deformation of the copper bushing 3 during use and extend the service life of the bushing 3; through the ceramic layer 34, The accumulated deformation of the bushing 3 can be reflected. When the critical value of the deformation is reached, the ceramic layer 34 breaks, which can be seen through the transparent packaging layer during routine maintenance, especially the breakage of the upper extension part 32 and the lower extension part 31 is more obvious, and the maintenance personnel can be informed to replace it to ensure the use of the compressor and avoid noise or damage to the compressor; the transparent packaging layer can prevent the ceramic layer 34 from entering the compressor after breaking and causing problems such as cylinder pulling, thereby ensuring the use of the compressor; the ceramic layer 34, the packaging layer and the bushing 3 are installed separately, the bushing 3 is cooled and the piston body 1 is heated, the purpose is to expand and contract with heat and improve the installation effect, but the cooling of the bushing 3 will affect its shape. If the ceramic layer 34 is installed in advance, the change in volume will easily cause the ceramic layer 34 to be directly expanded and broken by the bushing 3 and then fail. Therefore, the function of the ceramic layer 34 can be guaranteed after it is restored to room temperature.

[0034] Furthermore, a lubricating coating is provided on the inner surface of the bushing 3 .

[0035] It can be seen from the above description that the friction between the bushing 3 and the piston pin 2 can be reduced by the lubricating coating.

[0036] Furthermore, the lubricating coating is a non-metallic lubricating coating.

[0037] From the above description, it can be seen that by adopting a non-metallic lubricating coating, electrochemical corrosion can be avoided and the service life can be extended.

[0038] Furthermore, the lubricating coating is a graphite coating, a polytetrafluoroethylene coating, a silicon nitride coating, or a diamond film.

[0039] Furthermore, the surface of the ceramic layer 34 is mirror-finished.

[0040] From the above description, it can be seen that once cracks occur on the surface of the mirror-treated ceramic layer 34, due to the characteristics of the mirror surface, they can be clearly seen through strong light such as a flashlight.

[0041] Furthermore, the encapsulation layer is transparent polyimide.

[0042] From the above description, it can be seen that the temperature range for long-term stable use of transparent polyimide is -269°C to 280°C, and the operating temperature of the compressor is generally within 160°C to ensure the transparent effect.

[0043] Furthermore, a ceramic layer 34 and a packaging layer are provided on a surface of the bushing 3 facing the inside of the piston body 1 .

[0044] From the above description, it can be known that, since a ceramic layer 34 and a packaging layer are provided on a side of the bushing 3 facing the inside of the piston body 1, detection can also be performed from the inside to avoid the bushing 3 from deforming inwardly.

[0045] Furthermore, the inner surface of the pin hole 11 and the outer surface of the piston pin 2 are polished.

[0046] It can be seen from the above description that the inner surface of the pin hole 11 and the outer surface of the piston pin 2 that have been polished can reduce wear and facilitate installation.

[0047] Furthermore, after the piston body 1 and the bushing return to room temperature to form an interference fit, the ceramic layer 34 is attached to the side of the bushing 3 facing the outside of the piston body 1 and is encapsulated by the encapsulation layer.

[0048] Furthermore, there are multiple rows of silicon nitride pillars 33 in the lower extension portion 31 or the upper extension portion 32 , each row has multiple silicon nitride pillars 33 , and the silicon nitride pillars 33 in adjacent rows are arranged in a staggered manner.

[0049] It can be seen from the above description that the staggered arrangement can organize the bushing 3 to deform in one direction to ensure the supporting effect.

[0050] Embodiment 1

[0051] A wear-resistant compressor piston comprises a piston body 1, a piston pin 2 and two bushings 3. The piston body 1 is provided with a pin hole 11 penetrating the piston body 1; the bushing 3 is arranged in the pin hole 11, and the piston pin 2 is rotatably arranged in the bushing 3;

[0052] Obtain the area where the piston body 1 forms pressure on the side wall of the pin hole 11 when the piston body 1 inhales gas downward, and mark the area as the pull-down force area; obtain the area where the piston body 1 forms pressure on the side wall of the pin hole 11 when the piston body 1 compresses gas upward, and mark the area as the push-up force area;

[0053] The piston body 1 corresponding to the pull-down force area and the push-up force area is milled to obtain a pull-down milling groove and an push-up milling groove, respectively, wherein the edge sections of the pull-down milling groove and the push-up milling groove are arc-shaped; the pull-down milling groove and the push-up milling groove are integrated with the pin hole 11;

[0054] The bushing 3 is made of copper; the bushing 3 is provided with a lower extension part 31 and an upper extension part 32 whose shapes correspond to the pull-down milling groove and the push-up milling groove, and the lower extension part and the upper extension part cooperate with the arc edge section of the pull-down milling groove and the push-up milling groove to form a larger force-bearing area; a plurality of silicon nitride columns 33 are respectively distributed in the upper extension part 32 and the lower extension part 31, and the silicon nitride column 33 faces the central axis of the piston pin 2, and the silicon nitride column 33 is used to enhance the supporting effect of the upper extension part 32 and the lower extension part 31, thereby reducing the copper bushing 3 under long-term force. The end of the silicon nitride column 33 corresponding to the inner surface of the bushing 3 is the same arc surface as the inner surface of the bushing 3 and extends to the inner surface of the bushing 3 to achieve support and self-lubrication, and the other end extends to the surface of the pull-down milling groove or the push-up milling groove and fits with the surface of the pull-down milling groove or the push-up milling groove; the side of the bushing 3 facing the outside of the piston body 1 is provided with a ceramic layer 34 and a packaging layer covering the bushing 3, the upper extension part 32 and the lower extension part 31; the ceramic layer 34 is pasted on the side of the bushing 3, and the packaging layer seals and fixes the ceramic layer 34; the packaging layer is transparent;

[0055] The wear-resistant compressor piston includes an installation step, which includes: heating the piston body 1 to a predetermined temperature and then keeping it warm; freezing the bushing 3 that is not installed with the ceramic layer 34 and the packaging layer, and after freezing for a predetermined time, aligning the lower extension 31 and the upper extension 32 of the bushing 3 with the pull-down milling groove and the push-up milling groove and then installing them in the piston body 1, and after the piston body 1 and the bushing are restored to room temperature, attaching the ceramic layer 34 to the side of the bushing 3 facing the outside of the piston body 1 and packaging the ceramic layer 34 through the packaging layer;

[0056] The wear-resistant compressor piston includes an inspection step, which includes: during inspection, the shape of the ceramic layer 34 is judged through a transparent packaging layer. If the bushing 3 is deformed due to force, the ceramic is squeezed to cause the ceramic layer 34 to break, and it is determined that the bushing 3 is damaged. The bushing 3 is removed, the pin hole 11, the pull-down milling groove and the push-up milling groove are cleaned, and the installation step is re-executed; if the ceramic layer 34 is not broken, no action is taken.

[0057] A lubricating coating is provided on the inner surface of the bushing 3 .

[0058] The lubricating coating is a silicon nitride coating.

[0059] The surface of the ceramic layer 34 is mirror-finished.

[0060] The encapsulation layer is transparent polyimide.

[0061] The bushing 3 is further provided with a ceramic layer 34 and a packaging layer on a surface facing the inside of the piston body 1 .

[0062] The inner surface of the pin hole 11 and the outer surface of the piston pin 2 are polished.

[0063] After the piston body 1 and the bushing return to room temperature, an interference fit is formed, and the ceramic layer 34 is attached to the side of the bushing 3 facing the outside of the piston body 1 and encapsulated by the encapsulation layer.

[0064] The silicon nitride pillars 33 in the lower extension portion 31 or the upper extension portion 32 are arranged in multiple rows, each row having multiple silicon nitride pillars 33 , and the silicon nitride pillars 33 in adjacent rows are arranged in a staggered manner.

[0065] Embodiment 2

[0066] A wear-resistant compressor piston comprises a piston body 1, a piston pin 2 and two bushings 3. The piston body 1 is provided with a pin hole 11 penetrating the piston body 1; the bushing 3 is arranged in the pin hole 11, and the piston pin 2 is rotatably arranged in the bushing 3;

[0067] Obtain the area where the piston body 1 forms pressure on the side wall of the pin hole 11 when the piston body 1 inhales gas downward, and mark the area as the pull-down force area; obtain the area where the piston body 1 forms pressure on the side wall of the pin hole 11 when the piston body 1 compresses gas upward, and mark the area as the push-up force area;

[0068] The piston body 1 corresponding to the pull-down force area and the push-up force area is milled to obtain a pull-down milling groove and an push-up milling groove, respectively, wherein the edge sections of the pull-down milling groove and the push-up milling groove are arc-shaped; the pull-down milling groove and the push-up milling groove are integrated with the pin hole 11;

[0069] The bushing 3 is made of copper; the bushing 3 is provided with a lower extension part 31 and an upper extension part 32 whose shapes correspond to the pull-down milling groove and the push-up milling groove, and the lower extension part and the upper extension part cooperate with the arc edge section of the pull-down milling groove and the push-up milling groove to form a larger force-bearing area; a plurality of silicon nitride columns 33 are respectively distributed in the upper extension part 32 and the lower extension part 31, and the silicon nitride column 33 faces the central axis of the piston pin 2, and the silicon nitride column 33 is used to enhance the supporting effect of the upper extension part 32 and the lower extension part 31, thereby reducing the copper bushing 3 under long-term force. The end of the silicon nitride column 33 corresponding to the inner surface of the bushing 3 is the same arc surface as the inner surface of the bushing 3 and extends to the inner surface of the bushing 3 to achieve support and self-lubrication, and the other end extends to the surface of the pull-down milling groove or the push-up milling groove and fits with the surface of the pull-down milling groove or the push-up milling groove; the side of the bushing 3 facing the outside of the piston body 1 is provided with a ceramic layer 34 and a packaging layer covering the bushing 3, the upper extension part 32 and the lower extension part 31; the ceramic layer 34 is pasted on the side of the bushing 3, and the packaging layer seals and fixes the ceramic layer 34; the packaging layer is transparent;

[0070] The wear-resistant compressor piston includes an installation step, which includes: heating the piston body 1 to a predetermined temperature and then keeping it warm; freezing the bushing 3 that is not installed with the ceramic layer 34 and the packaging layer, and after freezing for a predetermined time, aligning the lower extension 31 and the upper extension 32 of the bushing 3 with the pull-down milling groove and the push-up milling groove and then installing them in the piston body 1, and after the piston body 1 and the bushing are restored to room temperature, attaching the ceramic layer 34 to the side of the bushing 3 facing the outside of the piston body 1 and packaging the ceramic layer 34 through the packaging layer;

[0071] The wear-resistant compressor piston includes an inspection step, which includes: during inspection, the shape of the ceramic layer 34 is judged through a transparent packaging layer. If the bushing 3 is deformed due to force, the ceramic is squeezed to cause the ceramic layer 34 to break, and it is determined that the bushing 3 is damaged. The bushing 3 is removed, the pin hole 11, the pull-down milling groove and the push-up milling groove are cleaned, and the installation step is re-executed; if the ceramic layer 34 is not broken, no action is taken.

[0072] A lubricating coating is provided on the inner surface of the bushing 3 .

[0073] The lubricating coating is a polytetrafluoroethylene coating.

[0074] The surface of the ceramic layer 34 is mirror-finished.

[0075] The encapsulation layer is transparent polyimide.

[0076] The inner surface of the pin hole 11 and the outer surface of the piston pin 2 are polished.

[0077] After the piston body 1 and the bushing return to room temperature, an interference fit is formed, and the ceramic layer 34 is attached to the side of the bushing 3 facing the outside of the piston body 1 and encapsulated by the encapsulation layer.

[0078] The silicon nitride pillars 33 in the lower extension portion 31 or the upper extension portion 32 are arranged in multiple rows, each row having multiple silicon nitride pillars 33 , and the silicon nitride pillars 33 in adjacent rows are arranged in a staggered manner.

[0079] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A wear-resistant compressor piston, characterized in that: It comprises a piston body, a piston pin and two bushings, wherein the piston body is provided with a pin hole penetrating the piston body; the bushing is arranged in the pin hole, and the piston pin is rotatably arranged in the bushing; Obtain the area where the piston body forms pressure on the side wall of the pin hole when the piston body moves downward to inhale gas, and mark the area as the pull-down force area; obtain the area where the piston body forms pressure on the side wall of the pin hole when the piston body moves upward to compress gas, and mark the area as the push-up force area; The piston body corresponding to the pull-down force area and the push-up force area is milled respectively to obtain a pull-down milling groove and an push-up milling groove, wherein the edge sections of the pull-down milling groove and the push-up milling groove are arc-shaped; the pull-down milling groove and the push-up milling groove are integrated with the pin hole; The bushing is made of copper; the bushing is provided with a lower extension and an upper extension in shape corresponding to the pull-down milling groove and the push-up milling groove, and the lower extension and the upper extension cooperate with the arc edge cut surface of the pull-down milling groove and the push-up milling groove to form a larger force-bearing area; a plurality of silicon nitride cylinders are respectively distributed in the upper extension and the lower extension, and the silicon nitride cylinder faces the central axis of the piston pin, and the silicon nitride cylinder is used to enhance the supporting effect of the upper extension and the lower extension, thereby reducing the deformation of the copper bushing under long-term stress; one end of the silicon nitride cylinder corresponding to the inner surface of the bushing is the same arc surface as the inner surface of the bushing and extends to the inner surface of the bushing to achieve support and self-lubrication, and the other end extends to the surface of the pull-down milling groove or the push-up milling groove and fits with the surface of the pull-down milling groove or the push-up milling groove; a ceramic layer and a packaging layer covering the bushing, the upper extension and the lower extension are provided on the side of the bushing facing the outside of the piston body; the ceramic layer is pasted on the side of the bushing, and the packaging layer seals and fixes the ceramic layer; the packaging layer is transparent; The wear-resistant compressor piston includes an installation step, which includes: heating the piston body to a predetermined temperature and then keeping it warm; freezing the bushing without the ceramic layer and the packaging layer, and after freezing for a predetermined time, aligning the lower extension part and the upper extension part of the bushing with the pull-down milling groove and the push-up milling groove and then installing them into the piston body, and after the piston body and the bushing return to room temperature, attaching the ceramic layer to the side of the bushing facing the outside of the piston body and packaging the ceramic layer through the packaging layer; The wear-resistant compressor piston includes an inspection step, which includes: during inspection, the shape of the ceramic layer is judged through a transparent packaging layer. If the bushing is deformed under force, the ceramic is squeezed to cause the ceramic layer to break, and the bushing is determined to be damaged. The bushing is removed, the pin hole, the pull-down milling groove and the push-up milling groove are cleaned, and the installation step is re-executed; if the ceramic layer is not broken, no action is taken.

2. The wear-resistant compressor piston according to claim 1, characterized in that A lubricating coating is provided on the inner surface of the bushing.

3. The wear-resistant compressor piston according to claim 2, characterized in that The lubricating coating is a non-metallic lubricating coating.

4. The wear-resistant compressor piston according to claim 3, characterized in that The lubricating coating is a graphite coating, a polytetrafluoroethylene coating, a silicon nitride coating, or a diamond film.

5. The wear-resistant compressor piston according to claim 1, characterized in that The surface of the ceramic layer is mirror-finished.

6. The wear-resistant compressor piston according to claim 1, characterized in that The encapsulation layer is transparent polyimide.

7. The wear-resistant compressor piston according to claim 1, characterized in that A ceramic layer and a packaging layer are also provided on a side of the bushing facing the inside of the piston body.

8. The wear-resistant compressor piston according to claim 1, characterized in that The inner surface of the pin hole and the outer surface of the piston pin are polished.

9. The wear-resistant compressor piston according to claim 1, characterized in that After the piston body and the bushing return to room temperature, an interference fit is formed, and the ceramic layer is attached to the side of the bushing facing the outside of the piston body and then encapsulated by the encapsulation layer.

10. The wear-resistant compressor piston according to claim 1, characterized in that There are multiple rows of silicon nitride columns in the lower extension part or the upper extension part, each row has multiple silicon nitride columns, and the silicon nitride columns in adjacent rows are arranged in a staggered manner.

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