CN118443239A - Dynamic working performance detection system and test method for high-pressure medium dynamic sealing assembly - Google Patents
Dynamic working performance detection system and test method for high-pressure medium dynamic sealing assembly Download PDFInfo
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- CN118443239A CN118443239A CN202410578388.7A CN202410578388A CN118443239A CN 118443239 A CN118443239 A CN 118443239A CN 202410578388 A CN202410578388 A CN 202410578388A CN 118443239 A CN118443239 A CN 118443239A
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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
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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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
- G01M13/00—Testing of machine parts
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Abstract
The invention discloses a dynamic working performance detection system and a test method of a high-pressure medium dynamic seal assembly, wherein the system comprises a cylinder body and a piston rod, a first high-pressure cavity and a second high-pressure cavity are defined in the cylinder body, a first accommodating groove and a second accommodating groove are formed in the piston part, the first accommodating groove is used for installing a first sealing element, and the second accommodating groove is used for installing a second sealing element; the detection device is connected with the first high-pressure cavity and the second high-pressure cavity and is used for filling a medium so as to perform leak detection test on the first high-pressure cavity and/or the second high-pressure cavity; the driving device is used for detecting the working performance of the first sealing element and/or the second sealing element. The detection device can be used for supplying pressure and releasing pressure to different parts of the cylinder body, so that the actions of the piston and the sealing assembly are realized, and the leakage collection and monitoring are realized through dynamic and static leakage channels. The system and method are used to verify the sealing performance of dynamic seals, perform running-in tests, leak rate measurements and comparisons, to facilitate performance testing, research and improvement of high pressure pneumatic seal assemblies.
Description
Technical Field
The invention relates to the technical field of nuclear power, in particular to a dynamic working performance detection system and a test method for a high-pressure medium dynamic sealing assembly.
Background
In the related field of nuclear safety, the large-caliber gas-liquid double-acting hydraulic cylinder is used for driving special equipment for executing a safety function, particularly a hydraulic cylinder with a single-side quick-acting function is stored with gas at one side, and the design requirement of failure safety can be met functionally; however, the high-pressure gas is used for storing energy in the structure, the dynamic seal at the high-pressure gas side has high requirement on air tightness, and the conventional combined piston dynamic seal structure is difficult to meet the air tightness requirement, so that the multi-purpose rubber-plastic combined soft seal structure is provided; common weaknesses of such seal assemblies and structures are:
1) Rubber dynamic seals are subjected to alternating air pressure at high pressure, particularly to rapid changes in air pressure during rapid motion, and are prone to "air explosion" damage under the combined action of air permeation and air pressure changes.
2) The rubber sealing member is in a dry friction working condition for a long time, and particularly when a quick-acting function is performed, larger friction and heat aging loss can be generated on the rubber member in a short time.
3) For most of gas-liquid linkage hydraulic mechanisms, the hydraulic pressure is higher than the gas pressure, and after long-term operation, the large-caliber hydraulic cylinder has very weak deformation under the action of the hydraulic pressure, so that the sealing gap at the dynamic sealing working position of the piston is changed, the working condition of a sealing piece is deteriorated, and the abrasion is aggravated.
4) The hydraulic cylinder used for a long time has the advantages that under the repeated friction of the sealing element, the microscopic change of the inner surface influences the lubrication effect of the dynamic seal, so that the friction force is increased, and the abrasion and aging of the rubber element under the transient working conditions such as starting, turning and the like are further deteriorated.
5) The equipment is required to realize safe function action at high temperature, most soft sealing structures are difficult to realize high-temperature dynamic sealing, and development of the sealing assembly needs to design a special formula and a manufacturing process and repeatedly verify actual working conditions.
6) When the seal wears out and loses sealing performance, the equipment may be forced to shut down, and the seal needs to be replaced later, and during replacement operations, it is often necessary to perform inspection tests on the seal performance.
The factors determine that dynamic performance test is required to be carried out on the sealing component in the work of development, maintenance, test and the like; at present, the production design link of the sealing assembly lacks corresponding practical working condition verification and detection equipment, and the use of a complete hydraulic cylinder and a driving mechanism for testing has high cost and complex equipment, and is difficult to carry out rapid and large-scale synchronous verification.
Disclosure of Invention
In a first aspect, the present invention provides a dynamic performance detection system for a high pressure media dynamic seal assembly, comprising:
a fixed assembly comprising a cylinder;
The piston rod is provided with a piston part in the middle of the piston rod, the piston part is used for limiting the interior of the cylinder body into a first high-pressure cavity and a second high-pressure cavity, a first accommodating groove and a second accommodating groove are axially arranged on the circumferential side surface of the piston part at intervals, the first accommodating groove is used for mounting a first sealing element, and the second accommodating groove is used for mounting a second sealing element;
the driving device is connected with at least one end of the piston rod so as to drive the piston rod to reciprocate along the axial direction;
The detection device is connected and communicated with the first high-pressure cavity and the second high-pressure cavity, and is used for filling media into the first high-pressure cavity and detecting the change condition of the media in the second high-pressure cavity when the first high-pressure cavity is filled with media into the second high-pressure cavity.
In some embodiments, the cylinder body is provided with a first connecting hole, a second connecting hole, a third connecting hole and a fourth connecting hole; the first high-pressure cavity is communicated with the first connecting hole and the third connecting hole, and the second high-pressure cavity is communicated with the second connecting hole and the fourth connecting hole;
the detection device is connected with the first connecting hole, the second connecting hole, the third connecting hole and the fourth connecting hole.
In some embodiments, the detection device comprises a first pressurization channel, a second pressurization channel, a first pressure relief channel, and a second pressure relief channel; the first pressurizing channel is communicated with the second pressurizing channel through a connecting pipe, and the first pressurizing channel and/or the second pressurizing channel are/is used for connecting a high-pressure medium source; the first pressurizing channel is provided with a first pressure gauge, and the second pressurizing channel is provided with a second pressure gauge;
The first pressurizing channel is used for being connected with the first connecting hole, and the second pressurizing channel is used for being connected with the second connecting hole; the first pressure relief channel is used for being connected with the third connecting hole, and the second pressure relief channel is used for being connected with the fourth connecting hole.
In some embodiments, a first control valve is arranged on the first pressure charging channel, a second control valve is arranged on the second pressure charging channel, a third control valve is arranged on the first pressure discharging channel, and a fourth control valve is arranged on the second pressure discharging channel;
and a fifth control valve is arranged on the connecting pipe.
In some embodiments, the circumferential side of the piston portion is further provided with an annular groove; the annular groove is positioned between the first accommodating groove and the second accommodating groove;
at least one end of the piston rod is provided with a leakage detection channel which is communicated with the annular groove.
In some embodiments, the leak detection passage includes a first passage extending axially from an end face of the second end of the piston rod to a position opposite the piston rod and the annular groove, and a second passage communicating radially with the first passage and the annular groove.
In some embodiments, the fixing assembly further comprises a first shaft sleeve and a second shaft sleeve, the cylinder body is of a hollow structure, and the first shaft sleeve and the second shaft sleeve are respectively and hermetically installed at two axial ends of the cylinder body;
the first high-pressure cavity is formed between the piston part and the first shaft sleeve; the second high-pressure cavity is formed between the piston part and the second sleeve.
In some embodiments, the portion of the piston rod on one axial side of the piston portion is a first rod portion, and the portion of the piston rod on the other axial side of the piston portion is a second rod portion;
The first shaft sleeve comprises a hollow first sleeve body, the first sleeve body is positioned at the inner side of the first end of the cylinder body and sleeved on the periphery of the first rod part, a first groove and a second groove are axially arranged on the inner side surface of the first sleeve body at intervals, the first groove is used for installing a first sealing element, and the first groove is used for installing a second sealing element;
the second sleeve comprises a hollow second sleeve body, the second sleeve body is positioned at the inner side of the second end of the cylinder body and sleeved on the periphery of the second rod part, a third groove and a fourth groove are axially arranged on the inner side surface of the second sleeve body at intervals, the third groove is used for installing a third sealing element, and the fourth groove is used for installing a fourth sealing element.
In some embodiments, the first sleeve is provided with a first detection channel extending through from an end wall of the first sleeve facing away from the second sleeve between the first groove and the second groove;
The second sleeve body is provided with a second detection channel, and the second detection channel is penetrated and extended between the third groove and the fourth groove by the end wall of the second sleeve body, which deviates from the first sleeve body.
In some embodiments, the outer circumference of the first sleeve body extends radially outward with a first connection portion and the outer circumference of the second sleeve body extends radially outward with a second connection portion;
The first connecting part and the second connecting part are respectively abutted against the two axial ends of the cylinder body, and the first connecting part and the second connecting part are connected by a plurality of connecting pieces.
In some embodiments, the piston rod is provided with protrusions at both axial ends of the piston portion, respectively, and the outer diameter of the protrusions is smaller than the outer diameter of the piston portion.
In a second aspect, the present invention provides a method for testing dynamic working performance of a high-pressure gas dynamic seal assembly, which is applied to the system for testing dynamic working performance of a high-pressure medium dynamic seal assembly according to any one of the embodiments, and the method for testing dynamic working performance of a high-pressure gas dynamic seal assembly includes the following steps:
S1: the detection device fills medium into the first high-pressure cavity and detects the change condition of the medium in the first high-pressure cavity so as to detect the dynamic working performance of the first sealing element, and/or the detection device fills medium into the second high-pressure cavity and detects the change condition of the medium in the second high-pressure cavity so as to detect the dynamic working performance of the second sealing element;
S2: the driving device drives the piston rod to reciprocate along the axial direction so as to carry out running-in test on the first sealing piece and the second sealing piece.
The implementation of the invention has the following beneficial effects: the dynamic working performance detection system of the high-pressure medium dynamic sealing assembly can be used for detecting the sealing performance of a dynamic sealing member so as to facilitate the performance improvement of a subsequent sealing member to obtain a sealing member with good performance, and when the reliability and service life of the sealing member are improved, the equipment maintenance frequency can be reduced, the forced shutdown caused by the leakage of a key sealing member is reduced, the overhaul period is shortened, and the labor/material cost is reduced.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the following description will be given with reference to the accompanying drawings and examples, it being understood that the following drawings only illustrate some examples of the present invention and should not be construed as limiting the scope, and that other related drawings can be obtained from these drawings by those skilled in the art without the inventive effort. In the accompanying drawings:
FIG. 1 is a schematic diagram of a dynamic performance test system for a high pressure media dynamic seal assembly in accordance with some embodiments of the present invention;
FIG. 2 is an exploded view of the dynamic performance test system (with connectors and seals omitted) of the high pressure media dynamic seal assembly shown in FIG. 1;
FIG. 3 is a second schematic diagram of a dynamic performance test system for a high pressure media dynamic seal assembly in accordance with some embodiments of the present invention;
FIG. 4 is an exploded view of the dynamic performance test system (with connectors omitted) of the high pressure media dynamic seal assembly shown in FIG. 3;
FIG. 5 is a cross-sectional view of a dynamic performance test system for a high pressure media dynamic seal assembly in accordance with some embodiments of the present invention;
Fig. 6 is a schematic structural diagram of the dynamic performance detection system (matching detection device and driving device) of the high-pressure medium dynamic seal assembly shown in fig. 5.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention, and do not indicate that the apparatus or element to be referred to must have specific directions, and thus should not be construed as limiting the present invention.
It should also be noted that unless explicitly stated or limited otherwise, terms such as "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or one or more intervening elements may also be present. The terms "first," "second," "third," and the like are used merely for convenience in describing the present invention and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby features defining "first," "second," "third," etc. may explicitly or implicitly include one or more such features. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
Referring to fig. 1 to 6, the present invention shows a dynamic performance detection system for a high-pressure medium dynamic seal assembly, which includes a fixed assembly 10, a piston rod 20, a driving device 40 and a detection device 30.
Wherein the stationary assembly 10 comprises a cylinder 11. The middle part of the piston rod 20 is provided with a piston part 21, the piston part 21 defines a first high-pressure cavity A and a second high-pressure cavity B inside the cylinder 11, a first accommodating groove 211 and a second accommodating groove 213 are axially arranged on the circumferential side surface of the piston part 21 at intervals, the first accommodating groove 211 is used for mounting the first sealing element 100, and the second accommodating groove 213 is used for mounting the second sealing element 200; the first seal 100 forms a dynamic seal assembly with the second seal 200. A driving means 40 is connected to at least one end of the piston rod 20 to drive the piston rod 20 to reciprocate in an axial direction. The detection device 30 is connected and communicated with the first high-pressure cavity a and is connected and communicated with the second high-pressure cavity B, the detection device 30 is used for filling medium into the first high-pressure cavity a and detecting the change condition of the medium in the first high-pressure cavity a), and/or the detection device 30 is used for filling medium into the second high-pressure cavity B and detecting the change condition of the medium in the second high-pressure cavity B.
The dynamic working performance detection system of the high-pressure medium dynamic sealing assembly is applied as follows: the first sealing member 100 is mounted on the first accommodating groove 211, the second sealing member 200 is mounted on the second accommodating groove 213, the piston rod 20 is mounted in the fixing assembly 10, the medium is filled into the first high-pressure cavity A and the second high-pressure cavity B through the detecting device 30, and meanwhile, the driving device 40 is used for driving the piston rod 20 to reciprocate so as to drive the first sealing member 100 and the second sealing member 200 to axially move, so that the first sealing member 100 and the second sealing member 200 are rubbed with the inner peripheral wall surface of the cylinder 11. Furthermore, the detecting device 30 may detect the medium change condition of the first high pressure chamber a and the second high pressure chamber B, so as to check the dynamic working performance of the first seal member 100 and the second seal member 200, for example, if the detecting device 30 detects that the pressure of the first high pressure chamber a is not changed and/or the medium leaks, it indicates that the first seal member 100 loses the sealing function due to abrasion (the abrasion caused by the abrasion of the first seal member 100 with the inner circumferential surface of the cylinder 11 during the axial movement), and similarly, if the detecting device 30 detects that the pressure of the second high pressure chamber B is not changed and/or the medium leaks, it indicates that the second seal member 200 wears (the abrasion caused by the abrasion of the second seal member 200 with the inner circumferential surface of the cylinder 11 during the axial movement), and so on.
The medium may be gas, so that the detecting device 30 may be used to charge the first high pressure chamber a with gas to change the pressure in the first high pressure chamber a, and the driving device 40 is used to drive the piston rod 20 to reciprocate, so that the detecting device 30 may be used to detect the pressure change condition and/or the gas leakage condition in the first high pressure chamber a, so as to check the dynamic working performance of the first sealing member 100, for example, if the pressure in the first high pressure chamber a is not changed and/or the gas leaks, it is indicated that the sealing member 100 loses sealing effect due to wear and other reasons; similarly, the detecting device may be used to charge the second high pressure chamber B with gas to change the pressure in the second high pressure chamber B, and the driving device 40 may be used to drive the piston rod 20 to reciprocate, so that the detecting device 30 may be used to detect the pressure change and/or gas leakage in the second high pressure chamber B, so as to check the dynamic working performance of the second sealing member 200, for example, if the pressure in the second high pressure chamber B is not changed and/or the gas leaks, it is indicated that the second sealing member 200 loses sealing effect due to abrasion or the like.
The medium may also be a liquid, so that the detecting device 30 may fill the first high pressure chamber a with the liquid, and the driving device 40 may drive the piston rod 20 to reciprocate, so that the detecting device 30 may detect the leakage condition of the liquid in the first high pressure chamber a, and check the dynamic working performance of the first sealing member 100, for example, if the liquid in the first high pressure chamber a leaks, it indicates that the first sealing member 100 loses sealing effect due to abrasion and other reasons; similarly, the detection device 30 may be used to fill the second high pressure chamber B with liquid, and the driving device 40 may be used to drive the piston rod 20 to reciprocate, so that the detection device 30 may be used to detect the leakage of the liquid in the second high pressure chamber B, and check the dynamic working performance of the second sealing member 200, for example, if the liquid in the second high pressure chamber B leaks, it is indicated that the second sealing member 200 loses sealing effect due to abrasion or the like.
In some embodiments, the cylinder 11 is substantially cylindrical, primarily as a mounting receptacle for the piston rod 20, which is used to simulate the actual cylinder structure.
The cylinder 11 is provided with a first connecting hole 111, a second connecting hole 112, a third connecting hole 113 and a fourth connecting hole 114; the first high pressure chamber a communicates with both the first connection hole 111 and the third connection hole 113, and the second high pressure chamber B communicates with both the second connection hole 112 and the fourth connection hole 114. The detecting device 30 is connected to the first, second, third and fourth connection holes 111, 112, 113 and 114 so as to fill the medium through the first and second connection holes 111, 112 and discharge the medium through the third and fourth connection holes 113 and 114.
Referring to fig. 6, in some embodiments, the detecting device 30 may include a first pressurizing channel 31, a second pressurizing channel 32, a first pressure releasing channel 33, and a second pressure releasing channel 34; the first pressurizing channel 31 is communicated with the second pressurizing channel 32 through a connecting pipe 35, and the first pressurizing channel 31 and/or the second pressurizing channel 32 are/is used for connecting a high-pressure medium source; the first pressurizing channel 31 is provided with a first pressure gauge 36, and the second pressurizing channel 32 is provided with a second pressure gauge 37.
The first pressurizing channel 31 is configured to be connected to the first connection hole 111, so as to charge the medium into the first high pressure chamber a through the first pressurizing channel 31 and the first connection hole 111.
The second pressurizing channel 32 is configured to be connected to the second connecting hole 112, so as to charge the medium into the second high-pressure chamber B through the second pressurizing channel 32 and the second connecting hole 112.
The first pressure release passage 33 is adapted to be connected to the third connection hole 113 for discharging the medium.
The second pressure relief passage 34 is adapted to be connected to the fourth connection hole 114 for discharging the medium.
With continued reference to fig. 6, in some embodiments, the first pressure-charging channel 31 is provided with a first control valve 38, the second pressure-charging channel 32 is provided with a second control valve 39, the first pressure-releasing channel 33 is provided with a third control valve 310, and the second pressure-releasing channel 34 is provided with a fourth control valve 311; the connection pipe 35 is provided with a fifth control valve 312.
When the first high-pressure chamber a and the second high-pressure chamber B need to be filled with high-pressure medium, the first control valve 38, the second control valve 39, the third control valve 310 and the fourth control valve 311 may be closed, the fifth control valve 312 may be opened, the high-pressure medium source may fill the first high-pressure chamber a with high-pressure medium through the first pressurizing channel 31, the high-pressure medium source may fill the second high-pressure chamber B with high-pressure medium through the second pressurizing channel 32, and the numerical changes of the first pressure gauge 36 and the second pressure gauge 37 may be observed, so that the medium may be filled under a predetermined high-pressure condition, and the inspection operation may be performed.
In other embodiments, the detecting device 30 may further include a first pipe 313, where the first pipe 313 is connected to and communicates with the first pressurizing channel 31, and a sixth control valve 314 may be disposed on the first pipe 313, and the first pipe 313 may be connected to a high pressure medium source through a quick connector or the like. In addition, the detecting device 30 may further include a second pipe 315, where the second pipe 315 is connected to and connected with the second pressurizing channel 32, a seventh control valve 316 may be disposed on the second pipe 315, and the second pipe 315 may be connected to a high pressure medium source through a quick connector or the like.
In this embodiment, when the pressurization is required, the first control valve 38, the second control valve 39, the third control valve 310, the fourth control valve 311 and the seventh control valve 316 are closed, the fifth control valve 312 and the sixth control valve 314 are opened, the high-pressure medium source can charge the high-pressure medium into the first high-pressure chamber a through the first pipeline 313, the high-pressure medium source can charge the high-pressure medium into the second high-pressure chamber B through the first pressurizing channel 31, the numerical changes of the first pressure gauge 36 and the second pressure gauge 37 are observed, and the inspection operation is performed when the pressurization is up to a predetermined high-pressure condition.
In some embodiments, the circumferential side of the piston portion 21 is further provided with an annular groove 212, the annular groove 212 being located between the first accommodation groove 211 and the second accommodation groove 213. It will be appreciated that the annular groove 212 may be provided such that the first seal 100 and the second seal 200 alone are subjected to the actual operating pressure differential.
At least one end of the piston rod 20 is provided with a leak detection passage 24, the leak detection passage 24 being in communication with the annular groove 212. The piston rod 20 may have first and second axial ends, the first end of the piston rod 20 may be adapted to be coupled to the drive means 40, and the leak detection passage 24 may be provided at the second end of the piston rod 20.
Further, the longitudinal section of the leak detection channel 24 is generally L-shaped, and the leak detection channel 24 may include a first channel 241 and a second channel 242, the first channel 241 axially extends from an end surface of the second end of the piston rod 20 to a position opposite to the piston rod 20 and the annular groove 212 (as shown in fig. 6), and the second channel 242 radially communicates the first channel 241 with the annular groove 212.
It will be appreciated that the provision of the leak detection passage 24 enables leak detection of either the first seal 100 or the second seal 200. When a gaseous medium is used, the leak rate measurement may use a U-shaped liquid-filled glass tube to collect the volume of leaking gas collected at the leak detection channel 24 over time; converted into volume V at standard temperature and pressure, the leak rate is the leak amount per unit of seal length per unit time: r=v (volume ml)/L (perimeter mm) T (time s). Preferably, the leak detection passage 24 may be connected to a pressure gauge by a pipe.
Referring to fig. 5, in some embodiments, the piston rod 20 is provided with protrusions 25 at both axial ends of the piston portion 21, respectively, and the outer diameter of the protrusions 25 is smaller than the outer diameter of the piston portion 21. Specifically, the outer diameter of the piston portion 21 is similar to the inner diameter of the cylinder 11, which may be the same, and further, the two ends of the piston rod 20 in the axial direction of the piston portion 21 are respectively provided with a protrusion 25, and the outer diameter of the protrusion 25 is smaller than the outer diameter of the piston portion 21, so that when the piston rod 20 reciprocates, gaps are left between the outer periphery of the protrusion 25 and the first connecting hole 111, the second connecting hole 112, the third connecting hole 113 and the fourth connecting hole 114, so that certain pressure is always maintained in the first high-pressure chamber a and the second high-pressure chamber B.
With continued reference to fig. 6, in some embodiments, the fixing assembly 10 further includes a first shaft sleeve 12 and a second shaft sleeve 13, the cylinder 11 is hollow, and the first shaft sleeve 12 and the second shaft sleeve 13 are respectively and hermetically installed at two axial ends of the cylinder 11; a first high-pressure chamber A is formed between the piston part 21 and the first shaft sleeve 12; a second high pressure chamber B is formed between the piston portion 21 and the second bushing 13.
Further, a portion of the piston rod 20 located on one axial side of the piston portion 21 is a first rod portion 22, and a portion of the piston rod 20 located on the other axial side of the piston portion 21 is a second rod portion 23.
The first sleeve 12 includes a hollow first sleeve body 121, the first sleeve body 121 is located at the inner side of the first end of the cylinder 11 and sleeved on the outer periphery of the first rod portion 22, a first groove 1211 and a second groove 1212 are axially and alternately arranged on the inner side surface of the first sleeve body 121, the first groove 1211 is used for installing the first sealing element 300, and the first groove 1211 is used for installing the second sealing element 400.
The second sleeve 13 includes a hollow second sleeve body 131, the second sleeve body 131 is located at the inner side of the second end of the cylinder 11 and sleeved on the outer periphery of the second rod portion 23, a third groove 1311 and a fourth groove 1312 are axially and alternately arranged on the inner side surface of the second sleeve body 131, the third groove 1311 is used for installing the third sealing element 500, and the fourth groove 1312 is used for installing the fourth sealing element 600.
It will be appreciated that the provision of the first sealing element 300, the second sealing element 400, the third sealing element 500, and the fourth sealing element 600 may improve the tightness of the fastening assembly 10 to improve the performance testing accuracy of the first seal 100 and the second seal 200.
Further, the first sleeve 121 is provided with a first detection channel 1213, and the first detection channel 1213 extends from the end wall of the first sleeve 121 facing away from the second sleeve 131 to between the first groove 1211 and the second groove 1212.
The second sleeve 131 is provided with a second detection channel 1313, and the second detection channel 1313 extends from the end wall of the second sleeve 131 facing away from the first sleeve 121 to between the third groove 1311 and the fourth groove 1312.
The first detection channel 1213 may be a filler pipe, which may be connected to an oil source, and may verify the sealing performance of the first sealing member 300 by indicating that there is a leak at the first sealing member 300 when oil oozes out from a gap between the first sleeve body 121 and the first stem portion 22.
Similarly, the second detecting channel 1313 may be a filler pipe, which may be connected to a source of oil, and when oil seeps out from a gap between the second sleeve 131 and the second rod 23, it indicates that there is a leak at the third sealing member 500, whereby the sealing performance of the third sealing member 500 may be checked.
In addition, when a gaseous medium is used, the leak rate measurement may use a U-shaped pour glass tube to collect the volume of leaking gas collected at the first detection channel 1213 and/or the second detection channel 1313 over time; converted into volume V at standard temperature and pressure, the leak rate is the leak amount per unit of seal length per unit time: r=v (volume ml)/L (perimeter mm) T (time s).
In some embodiments, the first seal 100, the second seal 200, the first seal element 300, the second seal element 400, the third seal element 500, the fourth seal element 600 may be made of a rubber seal material, wherein the rubber seal material comprises fluororubber/ethylene propylene diene monomer rubber/nylon/PTFE/PEEK, etc.
In some embodiments, the first sleeve 121 has a first connecting portion 122 extending radially outward from its outer periphery and the second sleeve 131 has a second connecting portion 132 extending radially outward from its outer periphery. The first connecting portion 122 and the second connecting portion respectively abut against two axial ends of the cylinder 11, and the plurality of connecting members 50 connect the first connecting portion 122 and the second connecting portion 132. The connecting piece 50 may include a plurality of screws and a plurality of nuts, the screws penetrate through the first connecting portion 122 and the second connecting portion 132, and the portion protruding out of the second connecting portion 132 is locked by the nuts, preferably, a spacer may be disposed between the nuts and the second connecting portion 132 facing away from the first connecting portion 122, so as to improve the connection stability of the connecting piece 50.
In some embodiments, the first sleeve 12 is the same size as the second sleeve 13.
It can be appreciated that the first connecting portion 122 and the second connecting portion 132 can be connected by the connecting member 50 to combine the fixing assembly 10, and when the fixing assembly 10 needs to be disassembled, only the connecting member 50 needs to be disassembled.
Referring again to fig. 1-4, in some embodiments, the securing assembly 10 can further include an end plate 14, and the aforementioned connector 50 can connect the end plate 14, the first connecting portion 122, and the second connecting portion 132. The end plate 14 may be fixed in place, such as on a laboratory stand, to maintain the support and stability of the overall device.
Referring to fig. 2, 4 and 5, in some embodiments, a first limiting groove 115 may be disposed on an axial side wall of the cylinder 11 facing the first connecting portion 122, a first sealing ring 700 may be disposed in the first limiting groove 115, a second limiting groove 116 may be disposed on an axial side wall of the cylinder 11 facing the second connecting portion 132, and a second sealing ring 800 may be disposed in the second limiting groove 116, where when the connecting member 50 connects the first connecting portion 122 and the second connecting portion 132, the first sealing ring 700 and the second sealing ring 800 may be compressed to improve the tightness of the whole device.
As shown in connection with fig. 2, 5 and 6, in some embodiments, the axial end surface of the first end of the piston rod 20 is provided with a connecting groove 26 for connection with the driving means 40, the connecting groove 26 may be formed on the first rod part 22, and the connecting groove 26 is arranged coaxially with the piston rod 20. Preferably, the connection groove 26 and the driving device 40 may be connected by a combination of a connection rod and a coupling. Of course, the driving device 40 may be connected to the second rod portion 23, that is, both ends of the piston rod 20 may be connected to the driving device 40 for driving.
In some embodiments, the drive means 40 comprises a hydraulic cylinder, a pneumatic cylinder, or a drive motor. The driving motor can be a servo motor, the servo motor has high precision and positive and negative rotation functions, and the piston rod 20 can be driven to axially and repeatedly move.
As shown in fig. 6, the dynamic working performance detection system of the high-pressure medium dynamic sealing assembly is applied as follows: the first sealing member 100 is mounted on the first accommodating groove 211, the second sealing member 200 is mounted on the second accommodating groove 213, the piston rod 20 is mounted in the cylinder 11, the first shaft sleeve 12 and the second shaft sleeve 13 can be assembled, the first high-pressure cavity a and the second high-pressure cavity B are pressurized (gas medium or liquid medium) through the detection device 30, the piston rod 20 is driven to reciprocate by the driving device 40, the first pressure gauge 36 and the second pressure gauge 37 are observed, if the first pressure gauge 36 and/or the second pressure gauge 37 have a numerical value change, the fifth control valve 312 is closed, and then the numerical value change of the first pressure gauge 36 and the second pressure gauge 37 is continuously observed, if the first pressure gauge 36 has a numerical value change, the sealing performance of the first sealing member 100 is damaged. If the second pressure gauge 37 changes in value, this indicates that the sealing performance of the second seal 200 is impaired. If the first pressure gauge 36 and the second pressure gauge 37 are both changed in value, it is indicated that the sealing performance of the first seal member 100 and the second seal member 200 is damaged, and the performance of the first seal member 100 and the second seal member 200 can be checked by combining the pressure value of the high-pressure medium and the repeated movement stroke of the piston rod 20.
After the damaged or leaking location is determined, the leak rate calculation for the dynamic/static dynamic seal assembly (first seal 100 and second seal 200) may be quantified by collecting a measured amount of gas leaking within leak detection channel 24, first detection channel 1213, and/or second detection channel 1313, and comparing the sealing performance of the different seal assemblies accordingly.
Typical calculated leak rate results: the leakage rate r=v (volume ml)/L (perimeter mm) T (time s) is the volume of gas leaked per unit time per unit circumferential length of the seal (volume in standard conditions).
When the sealing leakage of the single-side piston is determined, the sealing leakage rate of the piston can be directly detected; when the leakage of the piston seals at the two sides is determined, the working medium in the piston cylinder chamber at one side is changed into hydraulic oil injection, for example, the hydraulic oil is injected into the first high-pressure chamber A, the piston action is realized through the injection and the discharge of the hydraulic oil, and meanwhile, the leakage rate measurement and calculation are carried out by adopting the detection method. The method can accurately detect the leakage rate of any gas detection piston seal.
When running-in and mechanical wear testing is required, the wear testing can be performed by the driving device 40 under the condition that the fifth control valve 312 is opened to communicate with the double-sided cylinder, and when cooling is required for high-frequency actions, the whole device can be horizontally or vertically placed in cooling liquid (water, oil and the like) for temperature control (the driving part can be sealed by using a rubber expansion joint).
The invention also discloses a dynamic working performance test method of the high-pressure gas dynamic seal assembly, which is applied to the dynamic working performance detection system of the high-pressure medium dynamic seal assembly shown in any embodiment, and comprises the following steps:
S1: the detecting device 30 charges the medium into the first high pressure chamber a and detects a change condition of the medium in the first high pressure chamber a to check the dynamic operation performance of the first sealing member 100, and/or the detecting device 30 charges the medium into the second high pressure chamber B and detects a change condition of the medium in the second high pressure chamber B to check the dynamic operation performance of the second sealing member 200.
S2: the driving means 40 drives the piston rod 20 to reciprocate in the axial direction to perform a running-in test on the first seal 100 and the second seal 200.
Specifically, the first sealing member 100 is installed on the first accommodating groove 211, the second sealing member 200 is installed on the second accommodating groove 213, the piston rod 20 is installed in the cylinder 11, the first shaft sleeve 12 and the second shaft sleeve 13 can be assembled, the first high pressure cavity a and the second high pressure cavity B are filled with medium (gas medium or liquid medium) through the detecting device 30, the piston rod 20 is driven to reciprocate by the driving device 40, so as to drive the first sealing member 100 and the second sealing member 200 to axially move, and the first sealing member 100 and the second sealing member 200 are rubbed against the inner peripheral wall surface of the cylinder 11, so that a running-in test can be performed.
Meanwhile, the first pressure gauge 36 and the second pressure gauge 37 are observed, if the first pressure gauge 36 and/or the second pressure gauge 37 have numerical value changes, the fifth control valve 312 is closed, and then the numerical value changes of the first pressure gauge 36 and the second pressure gauge 37 are continuously observed, if the numerical value changes of the first pressure gauge 36, the sealing performance of the first sealing element 100 is damaged. If the second pressure gauge 37 changes in value, this indicates that the sealing performance of the second seal 200 is impaired. If the first pressure gauge 36 and the second pressure gauge 37 are both changed in value, it is indicated that the sealing performance of the first sealing member 100 and the second sealing member 200 is damaged, and the dynamic working performance of the first sealing member 100 and the second sealing member 200 can be tested by combining the pressure value of the high-pressure medium and the repeated movement stroke of the piston rod 20.
After the damaged or leaking location is determined, the leak rate calculation for the dynamic/static dynamic seal assembly (first seal 100 and second seal 200) may be quantified by collecting a measured amount of gas leaking within leak detection channel 24, first detection channel 1213, and/or second detection channel 1313, and comparing the sealing performance of the different seal assemblies accordingly.
Typical calculated leak rate results: the leakage rate r=v (volume ml)/L (perimeter mm) T (time s) is the volume of gas leaked per unit time per unit circumferential length of the seal (volume in standard conditions).
When the sealing leakage of the single-side piston is determined, the sealing leakage rate of the piston can be directly detected; when the leakage of the piston seals at the two sides is determined, the working medium in the piston cylinder chamber at one side is changed into hydraulic oil injection, for example, the hydraulic oil is injected into the first high-pressure chamber A, the piston action is realized through the injection and the discharge of the hydraulic oil, and meanwhile, the leakage rate measurement and calculation are carried out by adopting the detection method. The method can accurately detect the leakage rate of any gas detection piston seal.
When running-in and mechanical wear testing is required, the wear testing can be performed by the driving device 40 under the condition that the fifth control valve 312 is opened to communicate with the double-sided cylinder, and when cooling is required for high-frequency actions, the whole device can be horizontally or vertically placed in cooling liquid (water, oil and the like) for temperature control (the driving part can be sealed by using a rubber expansion joint).
It can be appreciated that the dynamic working performance detection system and method of the high-pressure medium dynamic seal assembly can be used for detecting the sealing performance of a dynamic seal so as to facilitate the performance improvement of a subsequent seal, thereby obtaining a seal with good performance, reducing the equipment maintenance frequency, reducing the forced shutdown caused by the leakage of a key seal, reducing the overhaul period and reducing the labor/material cost after the reliability and the service life of the seal are improved.
It is to be understood that the above examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (12)
1. A high pressure media dynamic seal assembly dynamic performance detection system, comprising:
-a fixed assembly (10), the fixed assembly (10) comprising a cylinder (11);
The piston rod (20), the middle part of the piston rod (20) is provided with a piston part (21), the piston part (21) is used for limiting a first high-pressure cavity (A) and a second high-pressure cavity (B) in the cylinder body (11), a first accommodating groove (211) and a second accommodating groove (213) are axially arranged on the circumferential side surface of the piston part (21) at intervals, the first accommodating groove (211) is used for mounting a first sealing element (100), and the second accommodating groove (213) is used for mounting a second sealing element (200);
-a driving device (40), said driving device (40) being connected to at least one end of said piston rod (20) for driving said piston rod (20) to reciprocate axially;
The detection device (30), detection device (30) with first high-pressure chamber (A) is connected and communicates, and with second high-pressure chamber (B) is connected and communicates, detection device (30) are used for to first high-pressure chamber (A) fills the medium and to first high-pressure chamber (A) in the medium change condition detect, and/or detection device (30) are used for to second high-pressure chamber (B) fills the medium and to second high-pressure chamber (B) in the medium change condition detect.
2. The dynamic working performance detection system of the high-pressure medium dynamic seal assembly according to claim 1, wherein the cylinder body (11) is provided with a first connecting hole (111), a second connecting hole (112), a third connecting hole (113) and a fourth connecting hole (114); the first high-pressure cavity (A) is communicated with the first connecting hole (111) and the third connecting hole (113), and the second high-pressure cavity (B) is communicated with the second connecting hole (112) and the fourth connecting hole (114);
The detection device (30) is connected with the first connection hole (111), the second connection hole (112), the third connection hole (113) and the fourth connection hole (114).
3. The dynamic performance detection system of a high pressure medium dynamic seal assembly according to claim 2, wherein the detection device (30) comprises a first pressurizing channel (31), a second pressurizing channel (32), a first pressure relief channel (33) and a second pressure relief channel (34); the first pressurizing channel (31) is communicated with the second pressurizing channel (32) through a connecting pipe (35), and the first pressurizing channel (31) and/or the second pressurizing channel (32) are/is used for connecting a high-pressure medium source; a first pressure gauge (36) is arranged on the first pressurizing channel (31), and a second pressure gauge (37) is arranged on the second pressurizing channel (32);
the first pressurizing channel (31) is used for being connected with the first connecting hole (111), and the second pressurizing channel (32) is used for being connected with the second connecting hole (112); the first pressure relief channel (33) is used for being connected with the third connecting hole (113), and the second pressure relief channel (34) is used for being connected with the fourth connecting hole (114).
4. A dynamic performance detection system for a high-pressure medium dynamic seal assembly according to claim 3, wherein a first control valve (38) is arranged on the first pressurizing channel (31), a second control valve (39) is arranged on the second pressurizing channel (32), a third control valve (310) is arranged on the first pressure releasing channel (33), and a fourth control valve (311) is arranged on the second pressure releasing channel (34);
The connecting pipe (35) is provided with a fifth control valve (312).
5. The dynamic performance detection system of a high-pressure medium dynamic seal assembly according to claim 1, wherein the circumferential side surface of the piston portion (21) is further provided with an annular groove (212); the annular groove (212) is positioned between the first accommodating groove (211) and the second accommodating groove (213);
at least one end of the piston rod (20) is provided with a leakage detection channel (24), and the leakage detection channel (24) is communicated with the annular groove (212).
6. The high pressure media dynamic seal assembly dynamic performance test system of claim 5, wherein said leak detection passage (24) comprises a first passage (241) and a second passage (242), said first passage (241) extending axially from an end face of said second end of said piston rod (20) to a relative position of said piston rod (20) and said annular groove (212), said second passage (242) radially communicating said first passage (241) with said annular groove (212).
7. The dynamic working performance detection system of the high-pressure medium dynamic seal assembly according to claim 1, wherein the fixing assembly (10) further comprises a first shaft sleeve (12) and a second shaft sleeve (13), the cylinder body (11) is of a hollow structure, and the first shaft sleeve (12) and the second shaft sleeve (13) are respectively and hermetically installed at two axial ends of the cylinder body (11);
-forming the first high pressure chamber (a) between the piston portion (21) and the first sleeve (12); the second high-pressure chamber (B) is formed between the piston part (21) and the second sleeve (13).
8. The dynamic performance detection system of a high-pressure medium dynamic seal assembly according to claim 7, wherein a portion of the piston rod (20) located on one axial side of the piston portion (21) is a first rod portion (22), and a portion of the piston rod (20) located on the other axial side of the piston portion (21) is a second rod portion (23);
The first shaft sleeve (12) comprises a hollow first sleeve body (121), the first sleeve body (121) is positioned at the inner side of the first end of the cylinder body (11) and sleeved on the periphery of the first rod part (22), a first groove (1211) and a second groove (1212) are formed in the inner side surface of the first sleeve body (121) at intervals along the axial direction, the first groove (1211) is used for installing the first sealing element (300), and the first groove (1211) is used for installing the second sealing element (400);
the second sleeve (13) comprises a hollow second sleeve body (131), the second sleeve body (131) is located at the inner side of the second end of the cylinder body (11) and sleeved on the periphery of the second rod portion (23), a third groove (1311) and a fourth groove (1312) are formed in the inner side surface of the second sleeve body (131) at intervals along the axial direction, the third groove (1311) is used for installing the third sealing element (500), and the fourth groove (1312) is used for installing the fourth sealing element (600).
9. The dynamic performance testing system of a high pressure media dynamic seal assembly of claim 8, wherein the first sleeve (121) is provided with a first testing channel (1213), the first testing channel (1213) extending from an end wall of the first sleeve (121) facing away from the second sleeve (131) through to between the first recess (1211) and the second recess (1212);
The second sleeve body (131) is provided with a second detection channel (1313), and the second detection channel (1313) is formed by the second sleeve body (131) deviating from the end wall of the first sleeve body (121) and extends to a position between the third groove (1311) and the fourth groove (1312) in a penetrating mode.
10. The dynamic performance test system of a high pressure medium dynamic seal assembly according to claim 8, wherein a first connecting portion (122) extends radially outwardly from an outer periphery of the first sleeve body (121), and a second connecting portion (132) extends radially outwardly from an outer periphery of the second sleeve body (131);
The first connecting part (122) and the second connecting part are respectively abutted against the two axial ends of the cylinder body (11), and the first connecting part (122) and the second connecting part (132) are connected by a plurality of connecting pieces (50).
11. The dynamic performance detection system of a high-pressure medium dynamic seal assembly according to any one of claims 1 to 10, wherein protruding portions (25) are respectively provided at both axial ends of the piston portion (21) of the piston rod (20), and an outer diameter of the protruding portions (25) is smaller than an outer diameter of the piston portion (21).
12. The dynamic working performance test method for the high-pressure gas dynamic seal assembly is applied to the dynamic working performance test system for the high-pressure medium dynamic seal assembly according to any one of claims 1 to 11, and is characterized by comprising the following steps:
S1: the detection device (30) fills the medium into the first high-pressure cavity (A) and detects the medium change condition in the first high-pressure cavity (A) so as to detect the dynamic working performance of the first sealing element (100), and/or the detection device (30) fills the medium into the second high-pressure cavity (B) and detects the medium change condition in the second high-pressure cavity (B) so as to detect the dynamic working performance of the second sealing element (200);
S2: the driving device (40) drives the piston rod (20) to reciprocate along the axial direction so as to carry out running-in test on the first sealing element (100) and the second sealing element (200).
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| CN202410578388.7A CN118443239A (en) | 2024-05-08 | 2024-05-08 | Dynamic working performance detection system and test method for high-pressure medium dynamic sealing assembly |
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| CN202410578388.7A CN118443239A (en) | 2024-05-08 | 2024-05-08 | Dynamic working performance detection system and test method for high-pressure medium dynamic sealing assembly |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118641107A (en) * | 2024-08-12 | 2024-09-13 | 邢台百信密封件有限公司 | Oil seal leak testing device |
| CN119712663A (en) * | 2024-12-23 | 2025-03-28 | 中国航空工业集团公司西安飞行自动控制研究所 | Hydraulic seal micro leakage observation device and method |
| CN120385504A (en) * | 2025-06-27 | 2025-07-29 | 中核核电运行管理有限公司 | A twin monitoring system and method for the piston cylinder of a heavy water reactor loader and unloader separator |
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2024
- 2024-05-08 CN CN202410578388.7A patent/CN118443239A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118641107A (en) * | 2024-08-12 | 2024-09-13 | 邢台百信密封件有限公司 | Oil seal leak testing device |
| CN118641107B (en) * | 2024-08-12 | 2024-11-15 | 邢台百信密封件有限公司 | Oil seal leak testing device |
| CN119712663A (en) * | 2024-12-23 | 2025-03-28 | 中国航空工业集团公司西安飞行自动控制研究所 | Hydraulic seal micro leakage observation device and method |
| CN120385504A (en) * | 2025-06-27 | 2025-07-29 | 中核核电运行管理有限公司 | A twin monitoring system and method for the piston cylinder of a heavy water reactor loader and unloader separator |
| CN120385504B (en) * | 2025-06-27 | 2025-09-19 | 中核核电运行管理有限公司 | A twin monitoring system and method for the piston cylinder of a heavy water reactor loader and unloader separator |
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