CN113280991A - Dynamic sealing performance testing tool for piston rod sealing element - Google Patents
Dynamic sealing performance testing tool for piston rod sealing element Download PDFInfo
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- CN113280991A CN113280991A CN202110459597.6A CN202110459597A CN113280991A CN 113280991 A CN113280991 A CN 113280991A CN 202110459597 A CN202110459597 A CN 202110459597A CN 113280991 A CN113280991 A CN 113280991A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/36—Investigating fluid-tightness of structures by using fluid or vacuum by detecting change in dimensions of the structure being tested
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention belongs to the technical field of sealing performance test, and particularly relates to a dynamic sealing performance test tool for a piston rod sealing element, which comprises: the device comprises a piston rod, a dust ring, a first pressure measuring joint, an outer cylinder O-shaped ring, an outer cylinder, a guide belt, a measured stedt seal, a piston O-shaped ring, a measured O-shaped ring, a piston body, a first stett seal, a floating piston, a second pressure measuring joint, a second stett seal, a pressing screw, an air cavity inner cylinder and a fixed piston; the invention has the following beneficial effects: (1) the test pressure is ensured by the gas pressure, an external hydraulic system is not needed, the overall structure is greatly simplified, and the cost is low. (2) The smaller gas pressure can reach the larger liquid cavity test pressure through pressurization, and the test pressure range is larger. (3) The leakage quantity is measured by indicating the size change quantity through the leakage quantity, the indication size can be changed as long as the leakage occurs in the liquid cavity, and the measurement precision and the sensitivity are high.
Description
Technical Field
The invention belongs to the technical field of sealing performance testing, and particularly relates to a dynamic sealing performance testing tool for a piston rod sealing element, which is mainly used for testing the sealing performance (leakage) of the piston rod sealing element under the working condition of high-pressure high-speed reciprocating motion.
Background
In general, since the liquid can be substantially equal to an incompressible body, a small amount of leakage can cause a large pressure drop in the liquid chamber without reducing the volume of the liquid chamber, and therefore, in order to test the reciprocating sealing performance of the sealing member under a high pressure condition, a hydraulic system for maintaining the pressure is required to be externally connected to maintain the pressure in the liquid chamber. A typical test fixture configuration is shown in figure 1. The test fixture of fig. 1 is mainly composed of the following parts: 01-measuring cup, 02-piston rod, 03-external hydraulic system, 04-dust ring, 05-piston body, 06-guide belt (3), 07-outer cylinder O-shaped ring (2), 08-outer cylinder, 09-pressing screw, 010-measured Stent seal (4), 011-measured O-shaped ring, 012-piston O-shaped ring (2).
The specific assembly sequence is as follows: firstly, installing a dustproof ring 04, a guide belt 06, a tested Stent seal 010, a tested O-shaped ring 011 and a piston O-shaped ring 012 on a piston body 05 according to related processes to form a complete piston assembly; then the outer cylinder O-shaped ring 07 is installed on the outer cylinder 08 to form outer cylinder assembly; thirdly, assembling the piston into the leftmost side of the outer cylinder; fourthly, a piston rod is arranged; fifthly, mounting a pressing screw on the outer cylinder; sixthly, connecting the right end of the piston rod with a driving force; seventhly, connecting an external hydraulic system 03, filling hydraulic oil into the inner cavity, and keeping required test pressure during testing; finally, the measuring cup 01 is placed at a designated position and used for measuring the volume of the hydraulic oil leaked from the sealing element.
The prior art has the following defects:
firstly, the test tool needs to be externally connected with a hydraulic system to maintain the pressure of the liquid cavity, and has complex overall structure and high cost.
Secondly, when the volume of the leaked liquid is measured through the measuring cup, the liquid adhesion exists on the outer surface of the piston rod, and the residual of a channel before the liquid drops into the measuring cup cannot be avoided, so that the measurement is inaccurate, the measurement is difficult when a small amount of leakage occurs, and the measurement precision and the sensitivity of the leakage amount are low.
And thirdly, the structural design of a pressurization structure is lacked, the test working pressure is completely provided by a hydraulic system, the upper limit of the test pressure is the maximum pressure provided by the hydraulic system, and the measurable pressure range is small.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: how to provide a piston rod sealing member sealing performance test frock structure, require it to have the characteristics that the system is simple, measure sensitive precision and sensitivity height, test pressure scope are great.
(II) technical scheme
In order to solve the technical problem, the invention provides a piston rod sealing element dynamic sealing performance testing tool, which comprises: the device comprises a piston rod 1, a dust ring 2, a first pressure measuring connector 3, an outer cylinder O-shaped ring 4, an outer cylinder 5, a guide belt 6, a measured steckel seal 7, a piston O-shaped ring 8, a measured O-shaped ring 9, a piston body 10, a first steckel seal 11, a floating piston 12, a second pressure measuring connector 13, a second steckel seal 14, a pressing screw 15, an air cavity inner cylinder 16 and a fixed piston 17;
the dust ring 2, the guide belt 6, the tested Stent seal 7, the tested O-shaped ring 9 and the piston O-shaped ring 8 are all arranged on the piston body 10 to form a complete piston assembly;
the first pressure measuring connector 3, the second pressure measuring connector 13 and the outer barrel O-shaped ring 4 are all arranged on the outer barrel 5 to form outer barrel assembly; the first pressure measuring joint 3 is arranged on the wall surface of the left liquid cavity of the outer barrel 5; the second pressure measuring joint 13 is arranged on the wall surface of the air cavity at the right part of the outer cylinder 5;
the two first Stent seals 11 and the two second Stent seals 14 are arranged on the traveling piston 12 to form a traveling piston assembly;
two first and two second steve seals 11, 14 are mounted on a fixed piston 17, forming a fixed piston assembly;
the piston assembly, the traveling piston assembly and the fixed piston assembly are sequentially arranged in the outer cylinder assembly; the piston assembly is positioned at the left end of the outer cylinder assembly; the traveling piston assembly is fixedly positioned at the right end part of the piston assembly; the fixed piston assembly is positioned at the right end of the outer cylinder assembly;
the air cavity inner cylinder 16 is arranged from the right end and enters the moving piston assembly and the fixed piston assembly; an air cavity is formed between the inner cylinder 16 of the air cavity and the inner wall of the outer cylinder 5; the floating piston assembly is positioned in the air cavity;
a liquid cavity is formed between the piston body 10 and the inner wall of the outer cylinder 5; the size of the outer wall of the left end part of the piston body 10 is matched with the size of the inner wall of the left end part of the outer cylinder 5;
the pressing screw 15 is arranged on the end face of the outer cylinder 5 from the right end, and the fixed piston 17 is used for pressing;
the piston rod 1 is inserted from the piston body 10, penetrates through the piston body 10, the traveling piston 12 and the fixed piston 17, and then extends out from the right end of the press screw 15, and the right end of the piston rod 1 is connected with an external driving force source.
Wherein, the radial dimension of the left liquid cavity of the outer cylinder 5 is smaller than the radial dimension of the right air cavity.
The specifications of the first stef seal 11 and the second stef seal 14 are different according to the specific requirements of assembly.
The dust ring 2, the guide belt 6, the tested Stent seal 7 and the tested O-shaped ring 9 are arranged between the outer wall of the piston rod 1 and the inner wall of the piston body 10;
three guide belts 6 are arranged; the number of the tested steckel seals 7 is four.
The outer cylinder O-shaped ring 4 and the piston O-shaped ring 8 are arranged between the outer wall of the piston body 10 and the inner wall of the outer cylinder 5;
two piston O-shaped rings 8 are arranged and are positioned in the middle of the piston body 10;
and two outer cylinder O-shaped rings 4 are arranged and are positioned at the front part of the outer cylinder 5.
Wherein the two first and second steve seals 11, 14 are mounted between the outer wall of the traveling piston 12 and the inner wall of the outer cylinder 5.
Wherein the two first and second steve seals 11, 14 are mounted between the outer wall of the fixed piston 17 and the inner wall of the outer cylinder 5.
The specific installation process of the piston rod sealing element dynamic sealing performance test tool is as follows:
firstly, installing a dustproof ring 2, a guide belt 6, a tested Stent seal 7, a tested O-shaped ring 9 and a piston O-shaped ring 8 on a piston body 10 according to related processes to form a complete piston assembly;
secondly, mounting the first pressure measuring joint 3, the second pressure measuring joint 13 and the outer barrel O-shaped ring 4 on the outer barrel 5 to form outer barrel assembly;
mounting the two first Stent seals 11 and the two second Stent seals 14 on the floating piston 12 to form a floating piston assembly;
mounting the two first steve seals 11 and the two second steve seals 14 on the fixed piston 17 to form a fixed piston assembly;
fifthly, sequentially loading the piston assembly in the step I, the moving piston assembly in the step III and the fixed piston assembly in the step IV into the outer cylinder assembly in the step II;
sixthly, the inner cylinder 16 of the air cavity is arranged into a moving piston assembly and a fixed piston assembly;
pressing and fixing the piston 17 by a pressing screw 15;
packing into the piston rod 1.
The dynamic sealing performance testing method of the piston rod sealing element based on the dynamic sealing performance testing tool for the piston rod sealing element comprises the following steps:
filling a specified liquid medium into the liquid cavity through a first pressure measuring joint 3, and controlling the pressure of the liquid cavity while filling the liquid;
injecting gas with certain pressure into the gas cavity through a second pressure measuring joint 13, and controlling the pressure of the liquid cavity while injecting the gas; the pressurization ratio of the liquid cavity and the pressure drop caused by leakage are fully considered, and the pressure of the liquid cavity is ensured to meet the test requirement all the time;
and thirdly, the piston rod completes reciprocating motion according to the specification, and the specific leakage amount is obtained by testing the leakage amount indication size variable quantity.
Wherein the leakage indication size means:
when the left liquid cavity of the outer cylinder 5 leaks, the pressure of the liquid cavity is reduced, so that the right air cavity generates pressure towards the left, the pressure pushes the floating piston 12 to the left to drive the piston body 10 to move leftwards together, thereby compressing the space of the liquid cavity and expanding the space of the air cavity, and when the space of the air cavity is expanded to a certain size, the pressure of the air cavity is reduced to a state of being balanced with the pressure of the liquid cavity due to the expansion pressure of gas, and the piston body 10 stops moving leftwards;
when the piston body 10 moves leftwards, the left end part of the piston body extends out of the left end part of the outer cylinder 5, and when the piston body 10 stops, the dimension of the left end part of the piston body extending out of the left end part of the outer cylinder 5 is the leakage quantity indicating dimension, and the leakage quantity indicating dimension is related to the leakage quantity of the liquid in the liquid chamber, so that the leakage quantity indicating dimension can be used for representing the leakage quantity of the liquid in the liquid chamber.
(III) advantageous effects
Compared with the prior art, the key points of the invention are as follows:
(1) the external hydraulic system is not needed to ensure the test pressure;
(2) the structure form of gas and liquid cavities is adopted, and pressure is transmitted through a traveling piston;
(3) through the pressurization design, the liquid cavity pressure is greater than the air cavity pressure by a certain multiple.
Therefore, the invention has the following beneficial effects:
(1) the test pressure is ensured by the gas pressure, an external hydraulic system is not needed, the overall structure is greatly simplified, and the cost is low.
(2) The smaller gas pressure can reach the larger liquid cavity test pressure through pressurization, and the test pressure range is larger.
(3) The leakage quantity is measured by indicating the size change quantity through the leakage quantity, the indication size can be changed as long as the leakage occurs in the liquid cavity, and the measurement precision and the sensitivity are high.
Drawings
Fig. 1 is a schematic diagram of a prior art structure.
FIG. 2 is a schematic view of the structure of the present invention.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
In order to solve the above technical problem, the present invention provides a piston rod sealing element dynamic sealing performance testing tool, as shown in fig. 2, the piston rod sealing element dynamic sealing performance testing tool includes: the device comprises a piston rod 1, a dust ring 2, a first pressure measuring joint 3 (liquid injection), an outer cylinder O-shaped ring 4, an outer cylinder 5, a guide belt 6, a measured stedt seal 7, a piston O-shaped ring 8, a measured O-shaped ring 9, a piston body 10, a first stett seal 11, a floating piston 12, a second pressure measuring joint 13 (gas injection), a second stett seal 14, a pressing screw 15, an air cavity inner cylinder 16 and a fixed piston 17;
the dust ring 2, the guide belt 6, the tested Stent seal 7, the tested O-shaped ring 9 and the piston O-shaped ring 8 are all arranged on the piston body 10 to form a complete piston assembly;
the first pressure measuring connector 3, the second pressure measuring connector 13 and the outer barrel O-shaped ring 4 are all arranged on the outer barrel 5 to form outer barrel assembly; the first pressure measuring joint 3 is arranged on the wall surface of the left liquid cavity of the outer barrel 5; the second pressure measuring joint 13 is arranged on the wall surface of the air cavity at the right part of the outer cylinder 5;
the two first Stent seals 11 and the two second Stent seals 14 are arranged on the traveling piston 12 to form a traveling piston assembly;
two first and two second steve seals 11, 14 are mounted on a fixed piston 17, forming a fixed piston assembly;
the piston assembly, the traveling piston assembly and the fixed piston assembly are sequentially arranged in the outer cylinder assembly; the piston assembly is positioned at the left end of the outer cylinder assembly; the traveling piston assembly is fixedly positioned at the right end part of the piston assembly; the fixed piston assembly is positioned at the right end of the outer cylinder assembly;
the air cavity inner cylinder 16 is arranged from the right end and enters the moving piston assembly and the fixed piston assembly; an air cavity is formed between the inner cylinder 16 of the air cavity and the inner wall of the outer cylinder 5; the floating piston assembly is positioned in the air cavity;
a liquid cavity is formed between the piston body 10 and the inner wall of the outer cylinder 5; the size of the outer wall of the left end part of the piston body 10 is matched with the size of the inner wall of the left end part of the outer cylinder 5;
the pressing screw 15 is arranged on the end face of the outer cylinder 5 from the right end, and the fixed piston 17 is used for pressing;
the piston rod 1 is inserted from the piston body 10, penetrates through the piston body 10, the traveling piston 12 and the fixed piston 17, and then extends out from the right end of the press screw 15, and the right end of the piston rod 1 is connected with an external driving force source.
Wherein, the radial dimension of the left liquid cavity of the outer cylinder 5 is smaller than the radial dimension of the right air cavity.
The specifications of the first stef seal 11 and the second stef seal 14 are different according to the specific requirements of assembly.
The dust ring 2, the guide belt 6, the tested Stent seal 7 and the tested O-shaped ring 9 are arranged between the outer wall of the piston rod 1 and the inner wall of the piston body 10;
three guide belts 6 are arranged; the number of the tested steckel seals 7 is four.
The outer cylinder O-shaped ring 4 and the piston O-shaped ring 8 are arranged between the outer wall of the piston body 10 and the inner wall of the outer cylinder 5;
two piston O-shaped rings 8 are arranged and are positioned in the middle of the piston body 10;
and two outer cylinder O-shaped rings 4 are arranged and are positioned at the front part of the outer cylinder 5.
Wherein the two first and second steve seals 11, 14 are mounted between the outer wall of the traveling piston 12 and the inner wall of the outer cylinder 5.
Wherein the two first and second steve seals 11, 14 are mounted between the outer wall of the fixed piston 17 and the inner wall of the outer cylinder 5.
The specific installation process of the piston rod sealing element dynamic sealing performance test tool is as follows:
firstly, installing a dustproof ring 2, a guide belt 6, a tested Stent seal 7, a tested O-shaped ring 9 and a piston O-shaped ring 8 on a piston body 10 according to related processes to form a complete piston assembly;
secondly, mounting the first pressure measuring joint 3, the second pressure measuring joint 13 and the outer barrel O-shaped ring 4 on the outer barrel 5 to form outer barrel assembly;
mounting the two first Stent seals 11 and the two second Stent seals 14 on the floating piston 12 to form a floating piston assembly;
mounting the two first steve seals 11 and the two second steve seals 14 on the fixed piston 17 to form a fixed piston assembly;
fifthly, sequentially loading the piston assembly in the step I, the moving piston assembly in the step III and the fixed piston assembly in the step IV into the outer cylinder assembly in the step II;
sixthly, the inner cylinder 16 of the air cavity is arranged into a moving piston assembly and a fixed piston assembly;
pressing and fixing the piston 17 by a pressing screw 15;
packing into the piston rod 1.
The dynamic sealing performance testing method of the piston rod sealing element based on the dynamic sealing performance testing tool for the piston rod sealing element comprises the following steps:
filling a specified liquid medium into the liquid cavity through a first pressure measuring joint 3, and controlling the pressure of the liquid cavity while filling the liquid;
injecting gas with certain pressure into the gas cavity through a second pressure measuring joint 13, and controlling the pressure of the liquid cavity while injecting the gas; the pressurization ratio of the liquid cavity and the pressure drop caused by leakage are fully considered, and the pressure of the liquid cavity is ensured to meet the test requirement all the time;
and thirdly, the piston rod completes reciprocating motion according to the specification, and the specific leakage amount is obtained by testing the leakage amount indication size variable quantity.
Wherein the leakage indication size means:
when the left liquid cavity of the outer cylinder 5 leaks, the pressure of the liquid cavity is reduced, so that the right air cavity generates pressure towards the left, the pressure pushes the floating piston 12 to the left to drive the piston body 10 to move leftwards together, thereby compressing the space of the liquid cavity and expanding the space of the air cavity, and when the space of the air cavity is expanded to a certain size, the pressure of the air cavity is reduced to a state of being balanced with the pressure of the liquid cavity due to the expansion pressure of gas, and the piston body 10 stops moving leftwards;
when the piston body 10 moves leftwards, the left end part of the piston body extends out of the left end part of the outer cylinder 5, and when the piston body 10 stops, the dimension of the left end part of the piston body extending out of the left end part of the outer cylinder 5 is the leakage quantity indicating dimension, and the leakage quantity indicating dimension is related to the leakage quantity of the liquid in the liquid chamber, so that the leakage quantity indicating dimension can be used for representing the leakage quantity of the liquid in the liquid chamber.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a piston rod sealing member movableness seal capability test frock, its characterized in that, piston rod sealing member movableness seal capability test frock includes: the device comprises a piston rod (1), a dust ring (2), a first pressure measuring connector (3), an outer cylinder O-shaped ring (4), an outer cylinder (5), a guide belt (6), a measured Stent seal (7), a piston O-shaped ring (8), a measured O-shaped ring (9), a piston body (10), a first Stent seal (11), a floating piston (12), a second pressure measuring connector (13), a second Stent seal (14), a pressing screw (15), an air cavity inner cylinder (16) and a fixed piston (17);
the dustproof ring (2), the guide belt (6), the tested Stent seal (7), the tested O-shaped ring (9) and the piston O-shaped ring (8) are all arranged on the piston body (10) to form a complete piston assembly;
the first pressure measuring connector (3), the second pressure measuring connector (13) and the outer barrel O-shaped ring (4) are all arranged on the outer barrel (5) to form outer barrel assembly; the first pressure measuring joint (3) is arranged on the wall surface of the left liquid cavity of the outer barrel (5); the second pressure measuring joint (13) is arranged on the wall surface of the air cavity at the right part of the outer cylinder (5);
the two first Stent seals (11) and the two second Stent seals (14) are arranged on the traveling piston (12) to form a traveling piston assembly;
two first Stent seals (11) and two second Stent seals (14) are mounted on a fixed piston (17) to form a fixed piston assembly;
the piston assembly, the traveling piston assembly and the fixed piston assembly are sequentially arranged in the outer cylinder assembly; the piston assembly is positioned at the left end of the outer cylinder assembly; the traveling piston assembly is fixedly positioned at the right end part of the piston assembly; the fixed piston assembly is positioned at the right end of the outer cylinder assembly;
the inner cylinder (16) of the air cavity is arranged from the right end and enters the movable piston assembly and the fixed piston assembly; an air cavity is formed between the inner cylinder (16) of the air cavity and the inner wall of the outer cylinder (5); the floating piston assembly is positioned in the air cavity;
a liquid cavity is formed between the piston body (10) and the inner wall of the outer cylinder (5); the size of the outer wall of the left end part of the piston body (10) is matched with the size of the inner wall of the left end part of the outer cylinder (5);
the pressing screw (15) is arranged on the end face of the outer cylinder (5) from the right end, and the fixed piston (17) is used for pressing;
the piston rod (1) is inserted from the piston body (10), penetrates through the piston body (10), the floating piston (12) and the fixed piston (17), and then extends out of the right end of the pressing screw (15), and the right end of the piston rod (1) is connected with an external driving force source.
2. The piston rod seal dynamic seal performance test fixture of claim 1, characterized in that the radial dimension of the left liquid cavity of the outer cylinder (5) is smaller than the radial dimension of the right air cavity.
3. The piston rod seal dynamic seal performance testing tool according to claim 1, wherein specifications of the first steiner (11) and the second steiner (14) are different according to specific assembly requirements.
4. The piston rod sealing element dynamic sealing performance testing tool according to claim 1, wherein the dust ring (2), the guide belt (6), the tested Stent seal (7) and the tested O-shaped ring (9) are arranged between the outer wall of the piston rod (1) and the inner wall of the piston body (10);
three guide belts (6) are arranged; the number of the tested Stent seals (7) is four.
5. The piston rod sealing element dynamic sealing performance testing tool according to claim 1, wherein the outer cylinder O-shaped ring (4) and the piston O-shaped ring (8) are arranged between the outer wall of the piston body (10) and the inner wall of the outer cylinder (5);
two piston O-shaped rings (8) are arranged and are positioned in the middle of the piston body (10);
and two outer cylinder O-shaped rings (4) are arranged and are positioned at the front part of the outer cylinder (5).
6. The piston rod seal dynamic seal performance test tool according to claim 1, wherein the two first stet seals (11) and the two second stet seals (14) are installed between the outer wall of the floating piston (12) and the inner wall of the outer cylinder (5).
7. The piston rod seal dynamic seal performance test tool according to claim 1, wherein the two first stet seals (11) and the two second stet seals (14) are installed between the outer wall of the fixed piston (17) and the inner wall of the outer cylinder (5).
8. The piston rod seal dynamic seal performance testing tool according to claim 1, wherein the piston rod seal dynamic seal performance testing tool is specifically installed in the following process:
firstly, installing a dustproof ring (2), a guide belt (6), a tested Stent seal (7), a tested O-shaped ring (9) and a piston O-shaped ring (8) on a piston body (10) according to related processes to form a complete piston assembly;
secondly, mounting the first pressure measuring joint (3), the second pressure measuring joint (13) and the outer cylinder O-shaped ring (4) on the outer cylinder (5) to form outer cylinder assembly;
mounting the two first Stent seals (11) and the two second Stent seals (14) on the floating piston (12) to form a floating piston assembly;
mounting the two first Stent seals (11) and the two second Stent seals (14) to the fixed piston (17) to form a fixed piston assembly;
fifthly, sequentially loading the piston assembly in the step I, the moving piston assembly in the step III and the fixed piston assembly in the step IV into the outer cylinder assembly in the step II;
sixthly, the inner cylinder (16) of the air cavity is arranged into a moving piston assembly and a fixed piston assembly;
seventhly, a pressing screw (15) is used for pressing and fixing the piston (17);
packing into a piston rod (1).
9. The piston rod seal dynamic seal performance testing tool according to claim 8, wherein the piston rod seal dynamic seal performance testing method based on the piston rod seal dynamic seal performance testing tool is as follows:
filling a specified liquid medium into a liquid cavity through a first pressure measuring joint (3), and controlling the pressure of the liquid cavity while filling liquid;
injecting gas with certain pressure into the gas cavity through a second pressure measuring joint (13), and controlling the pressure of the liquid cavity at the same time of gas injection; the pressurization ratio of the liquid cavity and the pressure drop caused by leakage are fully considered, and the pressure of the liquid cavity is ensured to meet the test requirement all the time;
and thirdly, the piston rod completes reciprocating motion according to the specification, and the specific leakage amount is obtained by testing the leakage amount indication size variable quantity.
10. The piston rod seal dynamic seal performance test fixture of claim 9, wherein the leakage indication dimension means:
when the left liquid cavity of the outer cylinder (5) leaks, the pressure of the liquid cavity is reduced, so that the right air cavity generates pressure towards the left, the pressure pushes the floating piston (12) to the left to drive the piston body (10) to move leftwards together, the space of the liquid cavity is compressed and the space of the air cavity is expanded, and when the space of the air cavity is expanded to a certain size, the pressure of the air cavity is reduced to a state of being balanced with the pressure of the liquid cavity due to gas expansion pressure, the piston body (10) moves leftwards and stops;
when the piston body (10) moves leftwards, the left end part of the piston body extends out of the left end part of the outer cylinder (5), when the piston body (10) stops, the size of the left end part of the piston body extending out of the left end part of the outer cylinder (5) is the leakage quantity indicating size, and the leakage quantity indicating size is related to the leakage quantity of the liquid in the liquid cavity, so that the leakage quantity indicating size can be used for representing the leakage quantity of the liquid in the liquid cavity.
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| CN202110459597.6A CN113280991B (en) | 2021-04-27 | 2021-04-27 | Dynamic sealing performance testing tool for piston rod sealing element |
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