Piston sealing structure of air cavity of hydraulic drive compressor

Abstract

The utility model relates to the technical field of hydraulic compressors, in particular to an air cavity piston sealing structure of a hydraulic compressor. Comprising a piston body, a plurality of guide belts are arranged on the outer surface of the piston body, a first step, a second step and a third step are sequentially machined on the outer surface of one side of the piston body from the middle to the end, a secondary sealing piece and a secondary check ring are installed on the first step, and a primary sealing piece, a primary check ring and a secondary supporting ring are installed on the second step. A main supporting ring and a clamping spring are installed on the third step, the secondary check ring and the secondary supporting ring are used for supporting and fixing the secondary sealing piece, and the main check ring and the main supporting ring are used for supporting and fixing the main sealing piece. The main sealing piece can seal high-pressure gas, the secondary sealing piece can seal low-pressure gas, the sealing effect can be improved through high-pressure and low-pressure cooperation, gas leakage is effectively avoided, the high-pressure resistance of the main sealing piece and the secondary sealing piece can be improved, and the main sealing piece, the secondary sealing piece and other parts are sequentially installed and are more convenient to disassemble, assemble and replace in the later period.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid drive compressor technical field especially relates to a liquid drive compressor air cavity piston sealing structure. BACKGROUND

[0002] At present, when the compressor pressurizes gas, the air cavity piston in the compressor is driven by a driving mechanism to reciprocate, thereby realizing the pressurization of the gas, wherein the driving mechanism includes a crankshaft connecting rod or a hydraulic driving form. When the air cavity piston reciprocates to pressurize the gas, the sealing element on the existing air cavity piston is easily damaged under high temperature and high pressure environment, has a short service life, causes the gas to leak, reduces the compression efficiency, and often needs to be stopped to replace the sealing element, which is troublesome to disassemble and assemble. There is no good solution to the above problems at present.

[0003] In summary, the sealing problem of the air cavity piston in the compressor has become a technical problem that needs to be solved in the industry. UTILITY MODEL CONTENTS

[0004] The utility model provides a liquid drive compressor air cavity piston sealing structure to make up for the deficiency of prior art, solve the problem that the sealing element of the air cavity piston in the previous compressor is easily damaged, has a short service life and is troublesome to disassemble and assemble.

[0005] The utility model provides a technical scheme to solve the above technical problems:

[0006] A liquid drive compressor air cavity piston sealing structure, comprising a piston body, the outer surface of the piston body is provided with a plurality of guide belts, a first step, a second step and a third step are sequentially machined from the middle to the end on the outer surface of one side of the piston body, the heights of the first step, the second step and the third step decrease in turn, a secondary sealing element and a secondary retainer ring are installed on the first step, a primary sealing element, a primary retainer ring and a secondary support ring are installed on the second step, a primary support ring and a snap spring are installed on the third step, the secondary retainer ring and the secondary support ring are used for supporting and fixing the secondary sealing element, the primary retainer ring and the primary support ring are used for supporting and fixing the primary sealing element, the thickness of the primary sealing element is greater than that of the secondary sealing element, and the outer surfaces of the primary sealing element and the secondary sealing element are flush.

[0007] The primary sealing element and the secondary sealing element are made of polytetrafluoroethylene and carbon fiber.

[0008] The primary sealing element and the secondary sealing element are internally provided with a stainless steel spring.

[0009] The primary sealing element is filled with super-clean rubber.

[0010] The utility model adopts the above scheme and has the following advantages:

[0011] By setting the primary seal and the secondary seal, the primary seal can seal high-pressure gas, and the secondary seal can seal low-pressure gas, and high-low pressure cooperation can improve the sealing effect, effectively avoiding gas leakage, and the secondary check ring and the secondary support ring are used to support and fix the secondary seal, and the primary check ring and the primary support ring are used to support and fix the primary seal, so that the high-pressure resistance of the primary seal and the secondary seal can be improved, and by setting the first step, the second step and the third step, the primary seal and the secondary seal and other components can be sequentially installed, and later disassembly and replacement is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic view of the utility model.

[0013] In the figure, 1, piston body, 2, guide belt, 3, first step, 4, second step, 5, third step, 6, secondary seal, 7, secondary check ring, 8, primary seal, 9, primary check ring, 10, secondary support ring, 12, circlip, 13, stainless steel spring, 14, super-clean rubber. DETAILED DESCRIPTION

[0014] In order to clearly illustrate the technical features of the scheme, the utility model will be described in detail below through specific implementation mode, and combined with its drawings.

[0015] As shown in Figure 1 A kind of liquid drive compressor gas cavity piston sealing structure, including piston body 1, the outer surface of the piston body 1 is equipped with several guide belts 2, guide belt 2 can be set two, can better assist the reciprocating motion of piston body 1 in cylinder, first step 3, second step 4 and third step 5 are sequentially machined on the outer surface of the side of piston body 1 from middle to end, the height of first step 3, second step 4 and third step 5 decreases in turn, secondary seal 6 and secondary check ring 7 are installed on first step 3, primary seal 8, primary check ring 9 and secondary support ring 10 are installed on second step 4, primary support ring 11 and circlip 12 are installed on third step 5, secondary check ring 7 and secondary support ring 10 are used to support and fix secondary seal 6, primary check ring 9 and primary support ring 11 are used to support and fix primary seal 8, the thickness of primary seal 8 is greater than the thickness of secondary seal 6, and the outer surfaces of primary seal 8 and secondary seal 6 are flush.

[0016] The primary seal 8 and the secondary seal 6 are made of polytetrafluoroethylene and carbon fiber, which have excellent wear resistance, low friction characteristics, and excellent high temperature and corrosion resistance.

[0017] The primary seal 8 and the secondary seal 6 are internally provided with stainless steel springs 13, which can improve the compression resistance.

[0018] The main seal 8 is filled with super-clean rubber 14, which can prevent dirt from filling the cavity.

[0019] Working principle:

[0020] During installation, the secondary stop ring 7 and the secondary seal 6 are sequentially installed on the first step 3, then the secondary support ring 10, the main stop ring 9 and the main seal 8 are sequentially installed on the second step 4, the main support ring 11 is installed on the third step 5, and finally the snap spring 12 is installed, which fixes the above components. The secondary stop ring 7 and the secondary support ring 10 can support and fix the secondary seal 6 to improve the high-pressure resistance of the secondary seal 6, the main stop ring 9 and the main support ring 11 can support and fix the main seal 8 to improve the high-pressure resistance of the main seal 8, and the first step 3, the second step 4 and the third step 5 are arranged from high to low, facilitating the later disassembly and replacement of the components. The thickness of the main seal 8 is greater than that of the secondary seal 6, the main seal 8 can seal high-pressure gas, and the secondary seal 6 can seal low-pressure gas, and the high-low pressure cooperation can improve the sealing effect and effectively avoid gas leakage.

[0021] The above specific embodiments cannot be regarded as a limitation on the protection scope of the utility model, and any alternative improvement or change made by the person skilled in the art to the utility model embodiments falls within the protection scope of the utility model.

[0022] The details not described in the utility model are the known technology of the person skilled in the art.

Claims

1. A liquid-cooled compressor gas pocket piston seal structure, characterized by: The piston body is provided with a plurality of guide belts on the outer surface thereof, and a first step, a second step and a third step are sequentially machined from the middle to the end on the outer surface of one side of the piston body, the heights of the first step, the second step and the third step are sequentially decreased, a secondary sealing member and a secondary retainer ring are installed on the first step, a primary sealing member, a primary retainer ring and a secondary support ring are installed on the second step, and a primary support ring and a snap spring are installed on the third step, the secondary retainer ring and the secondary support ring are used for supporting and fixing the secondary sealing member, the primary retainer ring and the primary support ring are used for supporting and fixing the primary sealing member, the thickness of the primary sealing member is greater than that of the secondary sealing member, and the outer surfaces of the primary sealing member and the secondary sealing member are flush.

2. A liquid-compressed air chamber piston seal structure according to claim 1, wherein: The primary sealing member and the secondary sealing member are made of a mixture of polytetrafluoroethylene and carbon fibers.

3. A liquid-compression engine piston seal structure according to claim 1, wherein: The primary sealing member and the secondary sealing member are internally provided with stainless steel springs.

4. A liquid-compression engine piston seal structure according to claim 1, wherein: The primary sealing member is filled with super-clean rubber.

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