Oil seepage prevention piston and machining method thereof

Abstract

The invention discloses a piston in a pump body, and aims at providing an oil seepage prevention piston which is good in oil sealing performance and convenient to produce and machine and a machining method of the oil seepage prevention piston. According to the technical scheme, the oil seepage prevention piston is characterized in that by means of interlocking arrangement of a split type piston structure, the produced piston structure can be rapidly positioned; the first installation body and the second installation body are matched in a nested mode through the sealing protruding strips and the sealing grooves to block oil, meanwhile, the multiple check blocks are arranged in the first installation body and the second installation body in a staggered mode to form a labyrinth type oil way, the oil seepage resistance capacity is remarkably improved, and after the first installation body and the second installation body are spliced, the oil seepage resistance capacity is greatly improved. A lubricating groove smaller than the inner wall of the air cylinder can be formed in the middle of the piston, friction loss is reduced, the whole structure has good sealing performance, machining is easy, continuous production can be automatically conducted, and the piston machining method is suitable for the technical field of piston machining.

Description

Technical Field

[0001] The present invention relates to a piston in a pump body, and more particularly to an oil-proof piston and a processing method thereof. Background Art

[0002] A piston is a component commonly used in the cylinder bore of various types of engines. It contacts the inner wall of the cylinder and can reciprocate along the inner wall of the cylinder when subjected to pressure from one side. The shape of the piston is configured to match the inner wall of the cylinder, and a lubricating layer is provided in the middle of the piston to provide lubrication for the piston during movement. Therefore, lubricating oil is usually added inside the piston to reduce friction during the piston's movement in the cylinder.

[0003] At present, the sealing effect of pistons on the market for lubricating oil is poor, which causes the lubricating oil to be consumed quickly during the use of the piston, resulting in oil waste. At the same time, it shortens the use time of the piston, requiring frequent addition of lubricating oil during the process, and during the movement of the piston, excessive lubricating oil will cause oil splashing, resulting in poor use effect. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an anti-oil seepage piston and a processing method thereof which has good oil sealing performance and is easy to produce and process.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an oil-seepage-proof piston, comprising a first mounting body and a second mounting body, wherein the first mounting body comprises: a first outer support frame, a first inner support frame, and a first support member disposed between the first outer support frame and the first inner support frame, wherein the first support member and the first outer support frame are provided with sealing ridges, and a plurality of first oil chambers are provided between the first outer support frame and the first inner support frame via the first support member;

[0006] The second mounting body comprises: a second outer support frame, a second inner support frame and a second support member arranged between the second outer support frame and the second inner support frame, the second support member and the second outer support frame are provided with a sealing groove matching the sealing ridge of the first support member, and a plurality of second oil chambers are arranged between the second outer support frame and the second inner support frame through the second support member.

[0007] The present invention is further configured as follows: the first outer support frame is provided with a plurality of first outer stops along its circumferential direction in the first oil chamber, and the first inner support frame is provided with a plurality of first inner stops along its circumferential direction in the first oil chamber, and the first outer stops and the first inner stops are alternately arranged in the first oil chamber.

[0008] Preferably, the second outer support frame is provided with a plurality of second outer stops along its circumferential direction in the first oil chamber, and the second inner support frame is provided with a plurality of second inner stops along its circumferential direction in the second oil chamber, and the second outer stops and the second inner stops are staggered in the second oil chamber.

[0009] The present invention is further configured as follows: a connecting protrusion is further provided in the first mounting body, a positioning block is provided on the connecting protrusion, a mounting hole matching the connecting protrusion is provided in the second mounting body, a positioning groove matching the positioning block is provided in the mounting hole, and after the connecting protrusion is inserted into the mounting hole, the sealing ridge and the sealing groove fit together.

[0010] Preferably, the stoppers in the first installation body and the second installation body are arranged alternately.

[0011] The present invention is further configured as follows: sealing sheets are provided at both ends of the piston, and the sealing sheets are installed as follows: the sealing sheets are placed on the surface of the first mounting body or the second mounting body, and the sealing sheets are pressed tightly against the upper / lower surface of the piston by stamping.

[0012] The present invention is further configured such that after the first mounting body and the second mounting body are assembled to form a piston, a lubrication groove is provided in the middle of the piston.

[0013] The present application also provides a method for processing an oil-leakage-proof piston, the method comprising the following steps: S1, splicing a first mounting body and a second mounting body of the piston so that: the connecting protrusion is inserted into the interior of the mounting hole, and the positioning block of the connecting protrusion matches the positioning slot in the mounting hole;

[0014] S2. Fix the first mounting body and the second mounting body so that the sealing ridge in the first mounting body and the sealing groove in the second mounting body are in close contact with each other to form a seal on the piston;

[0015] S3. After the first mounting body and the second mounting body are assembled to form a piston, the workpiece is placed in a processing machine, and a guide cone is installed on the top of the piston so that the center of the bottom surface of the guide cone matches the center of the top of the piston;

[0016] S4. After the guide cone is installed, place a sealing sheet on the guide cone;

[0017] S5. Punching the guide cone, the sealing sheet, and the piston so that the sealing sheet is in close contact with the current upper surface of the piston;

[0018] S6. After the stamping of the stamping sheet is completed, the current piston is turned over so that the bottom surface of the piston without the stamping of the sealing sheet faces upward;

[0019] S7. Install a guide cone on the top of the piston after the inversion is completed, and make the center position of the bottom surface of the guide cone match the center position of the top surface of the piston;

[0020] S8. After the guide cone is installed, install a sealing sheet on the guide cone;

[0021] S9. Punch the guide cone, the sealing sheet, and the piston so that the sealing sheet is in close contact with the current upper surface of the piston, thereby completing the punching installation of the sealing sheet.

[0022] By adopting the above technical solution, the beneficial effects are as follows: 1. The present application uses the interlocking setting of the split piston structure to enable the piston structure to be quickly positioned after production is completed. The first mounting body and the second mounting body are nested and cooperated with the sealing ridge and the sealing groove to form a barrier to the oil. At the same time, a plurality of blocks are staggered in the first mounting body and the second mounting body to form a maze-like oil circuit, which significantly improves the ability to resist oil seepage. By setting the first mounting body and the second mounting body as a structure separated from each other, the difficulty of processing a single workpiece is simplified, so that the workpiece can be formed by casting or stamping, reducing manufacturing costs. At the same time, the sealing plate is positioned by the guide cone, so that the sealing plate is ensured to fit the piston end face during the stamping process, preventing leakage during the processing process. At the same time, after the first mounting body and the second are spliced together, a lubrication groove smaller than the inner wall of the cylinder can be formed in the middle of the piston, reducing friction loss. The overall structure has good sealing performance, simple processing, and can be automatically produced continuously.

[0023] 2. Furthermore, a three-dimensional structure is adopted for sealing the lubricating oil. Specifically, in the radial direction of the piston, a seal is formed by the interference fit between the sealing ridge and the groove, and in the axial direction of the piston, the end face is sealed by stamping sealing sheets on the upper and lower surfaces of the piston. At the same time, a labyrinthine oil path is formed by staggered blocks inside the piston, which extends the circuitous path of the oil. The blocks are staggered, for example, the first outer block is circumferentially staggered with the first inner block and the second outer block, so that the oil chamber in the piston is further cut, forming a pressure balance area, thereby avoiding sealing failure due to local accumulation of oil.

[0024] 3. At the same time, during the assembly of the first mounting body and the second mounting body, positioning blocks and slots are used to ensure the precise positioning of each protrusion and groove during the installation process, eliminate assembly errors, and prevent insufficient sealing effects. The first mounting body and the second mounting body can be mass-cast using molds, which has high processing efficiency. During the installation process, the connecting protrusions are plugged into the mounting holes and are automatically locked by the positioning blocks to prevent misalignment, thereby improving the overall pressure resistance. In addition, the mounting bodies can be replaced independently, reducing the maintenance cost during the life cycle.

[0025] 4. In addition, during the processing of the piston, the positioning technology of the guide cone is used to ensure that the guide cone is accurately matched with the piston end face when installed, ensuring that the sealing piece can be located in the middle of the piston end face after being positioned by the guide cone, thereby preventing eccentricity during stamping. Specifically, the sealing piece is annular. When the sealing piece is installed on the guide cone, it can move along the height direction of the guide cone until the diameter of the current position of the guide cone is greater than the inner diameter of the sealing piece. At this time, the sealing piece is stationary on the guide cone and remains horizontal, ensuring the accuracy of the sealing piece during stamping and achieving good stamping processing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A cross-sectional view of the specific structure of an embodiment of an oil-seepage-proof piston and a processing method thereof according to the present invention;

[0027] Figure 2 This is a schematic diagram of the specific structure of the first support body of an embodiment of an oil-seepage-proof piston and a processing method thereof according to the present invention;

[0028] Figure 3 A schematic diagram of the specific structure of the second support body of an embodiment of an oil-seepage-proof piston and a processing method thereof according to the present invention;

[0029] Figure 4 This is a flowchart of a processing method of an oil-seepage-proof piston and a processing method thereof according to an embodiment of the present invention;

[0030] The accompanying drawings are as follows: 1. first mounting body; 11. first outer support frame; 12. first inner support frame; 13. first support member; 14. sealing ridge; 15. first oil chamber; 16. first outer stop block; 17. first inner stop block; 2. second mounting body; 21. second outer support frame; 22. second inner support frame; 23. second support member; 24. sealing groove; 25. second oil chamber; 26. second outer stop block; 27. second inner stop block; 3. connecting protrusion; 4. positioning block; 5. mounting hole; 6. positioning slot; 7. lubrication groove. DETAILED DESCRIPTION

[0031] Reference Figures 1 to 4 An embodiment of an oil-seepage-proof piston and a processing method thereof of the present invention is further described.

[0032] For ease of explanation, spatial relative terms such as "upper", "lower", "left", and "right" are used in the embodiments to illustrate the relationship between one element or feature shown in the figures and another element or feature. It should be understood that, in addition to the orientation shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0033] Moreover, relational terms such as “first” and “second” are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any actual relationship or order between these components.

[0034] An anti-oil seepage piston includes a first mounting body 1 and a second mounting body 2. The first mounting body 1 has: a first outer support frame 11, a first inner support frame 12, and a first support member 13 disposed between the first outer support frame 11 and the first inner support frame 12. The first support member 13 and the first outer support frame 11 are provided with sealing ridges 14. A plurality of first oil chambers 15 are provided between the first outer support frame 11 and the first inner support frame 12 via the first support member 13.

[0035] The second mounting body 2 comprises: a second outer support frame 21, a second inner support frame 22 and a second support member 23 arranged between the second outer support frame 21 and the second inner support frame 22. The second support member 23 and the second outer support frame 21 are provided with a sealing groove 24 matching the sealing ridge 14 of the first support member 13. A plurality of second oil chambers 25 are set between the second outer support frame 21 and the second inner support frame 22 through the second support member 23.

[0036] The first outer support frame 11 is provided with a plurality of first outer stops 16 along its circumferential direction in the first oil chamber 15, and the first inner support frame 12 is provided with a plurality of first inner stops 17 along its circumferential direction in the first oil chamber 15. The first outer stops 16 and the first inner stops 17 are alternately arranged in the first oil chamber 15.

[0037] Preferably, the second outer support frame 21 is provided with a plurality of second outer stops 26 along its circumferential direction in the first oil chamber 15, and the second inner support frame 22 is provided with a plurality of second inner stops 27 along its circumferential direction in the second oil chamber 25, and the second outer stops 26 and the second inner stops 27 are staggered in the second oil chamber 25.

[0038] The first mounting body 1 is further provided with a connecting protrusion 3, and a positioning block 4 is provided on the connecting protrusion 3. The second mounting body 2 is provided with a mounting hole 5 matching the connecting protrusion 3, and the mounting hole 5 is provided with a positioning groove 6 matching the positioning block 4. After the connecting protrusion 3 is inserted into the mounting hole 5, the sealing ridge 14 and the sealing groove 24 fit together.

[0039] Preferably, the stoppers in the first mounting body 1 and the second mounting body 2 are arranged alternately.

[0040] The piston is provided with sealing sheets at both ends, and the sealing sheets are installed as follows: the sealing sheets are placed on the surface of the first mounting body 1 or the second mounting body 2, and the sealing sheets are pressed tightly against the upper / lower surface of the piston by stamping.

[0041] After the first mounting body 1 and the second mounting body 2 are assembled to form a piston, a lubrication groove 7 is provided in the middle of the piston.

[0042] The present application also provides a method for processing an oil-leakage-proof piston, the method comprising the following steps: S1, splicing a first mounting body and a second mounting body of the piston so that: the connecting protrusion is inserted into the interior of the mounting hole, and the positioning block of the connecting protrusion matches the positioning slot in the mounting hole;

[0043] S2. Fix the first mounting body and the second mounting body so that the sealing ridge in the first mounting body and the sealing groove in the second mounting body are in close contact with each other to form a seal on the piston;

[0044] S3. After the first mounting body and the second mounting body are assembled to form a piston, the workpiece is placed in a processing machine, and a guide cone is installed on the top of the piston so that the center of the bottom surface of the guide cone matches the center of the top of the piston;

[0045] S4. After the guide cone is installed, place a sealing sheet on the guide cone;

[0046] S5. Punching the guide cone, the sealing sheet, and the piston so that the sealing sheet is in close contact with the current upper surface of the piston;

[0047] S6. After the stamping of the stamping sheet is completed, the current piston is turned over so that the bottom surface of the piston without the stamping of the sealing sheet faces upward;

[0048] S7. Install a guide cone on the top of the piston after the inversion is completed, and make the center position of the bottom surface of the guide cone match the center position of the top surface of the piston;

[0049] S8. After the guide cone is installed, install a sealing sheet on the guide cone;

[0050] S9. Punch the guide cone, the sealing sheet, and the piston so that the sealing sheet is in close contact with the current upper surface of the piston, thereby completing the punching installation of the sealing sheet.

[0051] The present application uses the interlocking setting of the split piston structure to enable the piston structure to be quickly positioned after production is completed. The first mounting body 1 and the second mounting body 2 are nested and cooperated with the sealing ridge 14 and the sealing groove 24 to form a barrier to the oil. At the same time, a plurality of blocks are staggered in the first mounting body 1 and the second mounting body 2 to form a labyrinthine oil circuit, which significantly improves the ability to resist oil seepage. By setting the first mounting body 1 and the second mounting body 2 to be separated from each other, the difficulty of processing a single workpiece is simplified, so that the workpiece can be formed by casting or stamping, reducing manufacturing costs. At the same time, the sealing plate is positioned by the guide cone, so that the sealing plate is ensured to fit the piston end face during the stamping process to prevent leakage during the processing. At the same time, after the first mounting body 1 and the second are spliced together, a lubrication groove 7 smaller than the inner wall of the cylinder can be formed in the middle of the piston, reducing friction loss. The overall structure has good sealing performance, simple processing, and can be automatically produced continuously.

[0052] Furthermore, a three-dimensional structure is adopted for sealing the lubricating oil. Specifically, in the radial direction of the piston, a seal is formed by the interference fit between the sealing ridge 14 and the groove, and in the axial direction of the piston, the end face sealing is achieved by stamping sealing sheets on the upper and lower surfaces of the piston. At the same time, a labyrinthine oil path is formed by staggered blocks inside the piston, which extends the circuitous path of the oil. The blocks are staggered, for example, the first outer block 16 is circumferentially staggered with the first inner block 17 and the second outer block 26, so that the oil chamber in the piston is further cut, forming a pressure balance area, thereby avoiding sealing failure due to local accumulation of oil.

[0053] At the same time, in the process of assembling the first mounting body 1 and the second mounting body 2, the positioning block 4 and the card slot are set to ensure the precise positioning of each protrusion and groove during the installation process, eliminate assembly errors, and prevent insufficient sealing effect. The first mounting body 1 and the second mounting body 2 can be mass-cast using molds, with high processing efficiency. During the installation process, the connecting protrusion 3 and the mounting hole 5 are plugged in, and the positioning block 4 is used to automatically lock to prevent dislocation, thereby improving the overall pressure resistance. In addition, the mounting body can be replaced independently, reducing the maintenance cost during the life cycle.

[0054] Moreover, during the processing of the piston, the positioning technology of the guide cone is used to ensure that the guide cone is accurately matched with the piston end face when installed, ensuring that the sealing piece can be located in the middle of the piston end face after being positioned by the guide cone, thereby preventing eccentricity during stamping. Specifically, the sealing piece is annularly arranged. When the sealing piece is installed to the guide cone, it can move along the height direction of the guide cone until the diameter of the current position of the guide cone is greater than the inner diameter of the sealing piece. At this time, the sealing piece is stationary on the guide cone and remains horizontal, which ensures the accuracy of the sealing piece during the stamping process and the good stamping effect.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil-seepage-proof piston, comprising a first mounting body (1) and a second mounting body (2), characterized in that: The first mounting body (1) comprises: a first outer support frame (11), a first inner support frame (12), and a first support member (13) arranged between the first outer support frame (11) and the first inner support frame (12); the first support member (13) and the first outer support frame (11) are provided with sealing ridges (14); a plurality of first oil chambers (15) are arranged between the first outer support frame (11) and the first inner support frame (12) via the first support member (13); The second mounting body (2) comprises: a second outer support frame (21), a second inner support frame (22) and a second support member (23) arranged between the second outer support frame (21) and the second inner support frame (22); the second support member (23) and the second outer support frame (21) are provided with a sealing groove (24) matching the sealing ridge (14) of the first support member (13); and a plurality of second oil chambers (25) are arranged between the second outer support frame (21) and the second inner support frame (22) via the second support member (23).

2. The oil-proof piston according to claim 1, characterized in that: The first outer support frame (11) is provided with a plurality of first outer stoppers (16) along its circumferential direction in the first oil chamber (15), and the first inner support frame (12) is provided with a plurality of first inner stoppers (17) along its circumferential direction in the first oil chamber (15), wherein the first outer stoppers (16) and the first inner stoppers (17) are alternately arranged in the first oil chamber (15).

3. The oil-seepage-proof piston according to claim 2, characterized in that: The second outer support frame (21) is provided with a plurality of second outer stoppers (26) along its circumferential direction in the first oil chamber (15), and the second inner support frame (22) is provided with a plurality of second inner stoppers (27) along its circumferential direction in the second oil chamber (25). The second outer stoppers (26) and the second inner stoppers (27) are arranged alternately in the second oil chamber (25).

4. The oil-seepage-proof piston according to claim 1, characterized in that: The first mounting body (1) is further provided with a connecting protrusion (3), and a positioning block (4) is provided on the connecting protrusion (3). The second mounting body (2) is provided with a mounting hole (5) matching the connecting protrusion (3), and a positioning groove (6) matching the positioning block (4) is provided in the mounting hole (5). After the connecting protrusion (3) is inserted into the mounting hole (5), the sealing ridge (14) and the sealing groove (24) are fitted with each other.

5. The oil-seepage-proof piston according to claim 3, characterized in that: The stoppers in the first installation body (1) and the second installation body (2) are arranged alternately.

6. The oil-seepage-proof piston according to claim 1, characterized in that: Sealing sheets are provided at both ends of the piston, and the sealing sheets are installed as follows: the sealing sheets are placed on the surface of the first installation body (1) or the second installation body (2), and the sealing sheets are pressed tightly against the upper / lower surface of the piston.

7. The oil-seepage-proof piston according to claim 1, characterized in that: After the first mounting body (1) and the second mounting body (2) are assembled to form a piston, a lubrication groove (7) is provided in the middle of the piston.

8. A method for processing an oil-proof piston according to any one of claims 1 to 7, characterized in that: The processing method comprises the following steps: S1, splicing the first mounting body and the second mounting body of the piston so that: the connecting protrusion is inserted into the interior of the mounting hole, and the positioning block of the connecting protrusion matches the positioning slot in the mounting hole; S2. Fix the first mounting body and the second mounting body so that the sealing ridge in the first mounting body and the sealing groove in the second mounting body are in close contact with each other to form a seal on the piston; S3. After the first mounting body and the second mounting body are assembled to form a piston, the workpiece is placed in a processing machine, and a guide cone is installed on the top of the piston so that the center of the bottom surface of the guide cone matches the center of the top of the piston; S4. After the guide cone is installed, place a sealing sheet on the guide cone; S5. Punching the guide cone, the sealing sheet, and the piston so that the sealing sheet is in close contact with the current upper surface of the piston; S6. After the stamping of the stamping sheet is completed, the current piston is turned over so that the bottom surface of the piston without the stamping of the sealing sheet faces upward; S7. Install a guide cone on the top of the piston after the inversion is completed, and make the center position of the bottom surface of the guide cone match the center position of the top surface of the piston; S8. After the guide cone is installed, install a sealing sheet on the guide cone; S9. Punch the guide cone, the sealing sheet, and the piston so that the sealing sheet is in close contact with the current upper surface of the piston, thereby completing the punching installation of the sealing sheet.

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