CN110702337A - Leak test device and leak test method - Google Patents
Leak test device and leak test method Download PDFInfo
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- CN110702337A CN110702337A CN201910891649.XA CN201910891649A CN110702337A CN 110702337 A CN110702337 A CN 110702337A CN 201910891649 A CN201910891649 A CN 201910891649A CN 110702337 A CN110702337 A CN 110702337A
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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
- G01M3/28—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 for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—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 for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
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- Examining Or Testing Airtightness (AREA)
Abstract
The invention relates to the technical field of leakage test, and discloses a leakage test device which comprises a pressurizing cylinder (21) and a pressure receiving cylinder (22) communicated with a tested valve (4), wherein a piston rod of the pressurizing cylinder (21) is connected with a moving rod of the pressure receiving cylinder (22) in series, so that the piston rod of the pressurizing cylinder (21) is driven to move axially when moving axially to drive the moving rod of the pressure receiving cylinder (22) to move axially or the moving rod of the pressure receiving cylinder (22) is driven to move axially when moving axially to drive the piston rod of the pressurizing cylinder (21). Through the piston rod of the pressurizing cylinder and the movable rod of the pressure receiving cylinder which are fixedly connected together, the piston rod of the pressurizing cylinder and the movable rod of the pressure receiving cylinder move axially simultaneously under the action of cooperation of the pressurizing cylinder and the pressure receiving cylinder, so that the leakage amount of the tested valve can be obtained according to the movement amount of the connected movable rod and the piston rod, the test and measurement precision is high, continuous test can be realized, and the structure is simple and easy to implement.
Description
Technical Field
The invention relates to the technical field of leakage testing. And more particularly to a leak testing apparatus and a leak testing method.
Background
At present, the method for testing the internal leakage amount of the hydraulic valve mainly comprises a manual recording method; a flow meter method: and (3) weighing method: pressure drop method, etc., adding pressure oil during testing or before adopting the tested valve, leaking through the valve core gap, and measuring the leakage amount at the T port; or pressure oil is added before the tested valve, leaks through the valve core gap, and the leakage amount of the oil inlet is measured.
The existing testing method has the problems that the measuring precision is poor; some methods have long waiting stability time and low efficiency; some of them require the test instrument to bear high pressure and are high in cost.
Disclosure of Invention
The invention aims to overcome the defects existing in the prior art: some measurement precision is poor; some methods have long waiting stability time and low efficiency; some test instruments need to bear high pressure, the problem with high costs provides a leak testing device. The leakage testing device has the advantages of high measuring precision, capability of realizing continuous testing, simple structure and easy implementation.
In order to achieve the above object, an aspect of the present invention provides a leakage testing apparatus, including a pressurizing cylinder and a pressurized cylinder communicating with a tested valve, where a piston rod of the pressurizing cylinder and a moving rod of the pressurized cylinder are connected in series, so that when the piston rod of the pressurizing cylinder moves axially, the moving rod of the pressurized cylinder is driven to move axially, or when the moving rod of the pressurized cylinder moves axially, the piston rod of the pressurized cylinder is driven to move axially.
Further, the leak test apparatus further comprises a measuring unit for measuring a movement stroke of the moving rod and/or the piston rod.
Further, the inner diameter of the cylinder body of the pressurizing cylinder is larger than that of the cylinder body of the pressurized cylinder.
Further, the rodless cavity of the pressurized cylinder and the rodless cavity of the pressurized cylinder are not communicated.
Further, the pressurized cylinder is configured as a plunger cylinder, and the movable rod is configured as a plunger.
Further, the pressurized cylinder further comprises a sealing unit for preventing the liquid in the rodless cavity of the pressurized cylinder from leaking out.
Further, the leakage testing device further comprises a pressure control unit and a direction control unit which are connected in series between the power unit and the testing unit.
Further, the pressure control unit comprises a pressure reducing valve connected between the power unit and the pressurizing cylinder and used for controlling the working pressure of the pressurizing cylinder.
Further, the control unit includes a direction change valve connected between the pressure reducing valve and the pressurizing cylinder for changing a flow direction of the fluid in the pressurizing cylinder.
Further, the leakage testing device further comprises a gas discharging unit fixed on the pressurized cylinder and used for discharging gas in the pressurized cylinder.
Further, the air release unit is arranged as an automatic air release valve.
Further, the automatic air release valve is fixed at the end part of one end, away from the pressurizing cylinder, of the pressurized cylinder.
The second aspect provides an internal leakage testing method, which comprises the steps of applying pressure equal to the working pressure of a unit to be tested through a pressurizing cylinder, maintaining the pressure, and after the leakage amount is stable, communicating a T port of a rod cavity of the pressurizing cylinder and communicating a pressure unit with a rodless cavity of the pressurizing cylinder; along with the leakage of the tested unit, the piston rod of the pressurizing cylinder and the moving rod of the pressurized cylinder start to move towards the pressurized cylinder side together, the displacement of the piston rod and/or the moving rod is recorded in a certain time period, and the leakage amount in the time period is obtained according to the displacement.
Through the technical scheme, the piston rod of the pressurizing cylinder and the moving rod of the pressurized cylinder are fixedly connected to enable the pressurizing cylinder and the pressurized cylinder to be connected in series, so that under the action of cooperation of the pressurizing cylinder and the pressurized cylinder, the piston rod of the pressurizing cylinder and the moving rod of the pressurized cylinder move axially at the same time, leakage of the tested valve can be obtained according to the moving amount of the moving rod and the piston rod which are connected together, the testing and measuring precision is high, continuous testing can be achieved, and the testing device is simple in structure and easy to implement.
Drawings
FIG. 1 is a schematic view of a leak testing apparatus according to an embodiment.
Description of the reference numerals
1-a power unit; 21-a pressurizing cylinder; 22-a pressure-receiving cylinder; 23-a measurement unit; 24-a sealing unit; 25-a gas release unit; 31-a pressure reducing valve; 32-a reversing valve; 4-the valve under test; 5-a linker; 6-recovery oil tank.
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
In the present invention, it is to be understood that the terms "away", "toward", "upper", "lower", "front", "rear", "left", "right", and the like indicate an orientation or positional relationship corresponding to an orientation or positional relationship in actual use; "inner and outer" refer to the inner and outer relative to the profile of the components themselves; this is done solely for the purpose of facilitating the description of the invention and simplifying the description without indicating that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation and therefore should not be construed as limiting the invention.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, a first aspect of the present invention provides a leakage testing apparatus, which includes a pressurizing cylinder 21 and a pressure-receiving cylinder 22 communicating with a tested valve 4, wherein a piston rod of the pressurizing cylinder 21 and a moving rod of the pressure-receiving cylinder 22 are connected in series, so that when the piston rod of the pressurizing cylinder 21 moves axially, the moving rod of the pressure-receiving cylinder 22 is driven to move axially, or when the moving rod of the pressure-receiving cylinder 22 moves axially, the piston rod of the pressurizing cylinder 21 is driven to move axially. Through the piston rod of the pressurizing cylinder and the movable rod of the pressure receiving cylinder which are fixedly connected together, the piston rod of the pressurizing cylinder and the movable rod of the pressure receiving cylinder move axially simultaneously under the action of cooperation of the pressurizing cylinder and the pressure receiving cylinder, so that the leakage amount of the tested valve can be obtained according to the movement amount of the connected movable rod and the piston rod, the test and measurement precision is high, continuous test can be realized, and the structure is simple and easy to implement.
The moving rod and the piston rod are fixedly connected through an internal thread axially arranged at the tail end of the piston rod and an external thread axially arranged at the tail end of the moving rod.
At the time of the test, it is necessary to read the moving amount of the piston rod and the moving rod connected together, and preferably, the leak test apparatus further includes a measuring unit 23 for measuring the moving stroke of the moving rod and/or the piston rod. The measuring unit 23 may adopt, for example, graduation marks engraved on the moving rod, or may adopt, for example, a displacement sensor, a grating ruler, etc. as a displacement measuring instrument. The measuring method can realize the test of the leakage amount of the tested valve in any time interval and can realize continuous test.
Further preferably, the measurement unit 23 is a grating ruler, when the grating ruler is used, one part of the grating ruler is fixed on the movable parts of the pressurizing cylinder 21 and the pressurized cylinder, and the other part of the grating ruler is fixed at any fixed position, the measurement is performed by using the grating ruler, the measurement precision is high, for example, when the movable rod diameter of the pressurized cylinder is 10mm, and the grating ruler precision is 0.1mm, the detection precision V pi d2 △ L/4 is 3.14 pi 102 x 0.1/4 is 0.008ml, the letter meaning in the formula V pi d2 x △ L/4 is the volume of the V-leaked fluid, d is the inner diameter of the pressurized cylinder, and the distance that △ L-leaked fluid moves in the pressurized cylinder, and the measurement precision achieved by using the grating ruler can meet the leakage detection requirements of strict products such as a multiway valve, a balance valve, a one-way valve and the like on leakage.
It is preferable that the inner diameter of the cylinder 21 is larger than the inner diameter of the cylinder 22 of the pressure receiving cylinder, and according to the above formula, V ═ pi d2 × △ L/4, it is found that the measurement accuracy is higher when the inner diameter of the pressure receiving cylinder 22 is smaller in the measurement, and in the same case, the measurement accuracy is higher in the same time, however, when the same leakage amount is measured, the smaller the inner diameter of the pressure receiving cylinder 22 is, the larger the stroke of the movable rod of the pressure receiving cylinder 22 is, the longer the length of the pressure receiving cylinder 22 is, and it is preferable that the inner diameter of the pressure receiving cylinder 22 is set within the range of 10 to 15mm, which ensures the better measurement accuracy, and the inner diameter of the pressure receiving cylinder 21 is made larger, so that the length of the pressure receiving cylinder 21 can be reduced in accordance with the requirement of the pressure, and wherein the inner diameters of the pressure receiving cylinder 21 and 22 are determined in accordance with the requirement of the pressure receiving cylinder 22 and the operating pressure of the power unit 1 for supplying power to the pressure receiving cylinder 21, and in general, the inner diameter of the pressure receiving cylinder 21 is 9 to be 9 to 11 times, and preferably 10 times the inner diameter of the pressure receiving.
Since the present application uses the pressure difference between the rodless cavity of the pressure receiving cylinder 22 and the rodless cavity of the pressure applying cylinder 21 to push the piston rod and the movable rod connected together to move axially, and calculates the leakage amount of the tested valve in a certain period of time according to the movement amount, it is preferable that the rodless cavity of the pressure applying cylinder 21 and the rodless cavity of the pressure receiving cylinder 22 are not communicated. Thus, the piston rod and the movable rod connected together can be axially moved by the pressurizing cylinder 21 and the pressurized cylinder 22 under the action force caused by the decrease of the liquid as the liquid in the rodless chamber of the pressurized cylinder 22 decreases, thereby accurately reflecting the leakage amount of the tested valve.
Preferably, the pressure-receiving cylinder 22 is configured as a plunger cylinder and the moving rod is configured as a plunger. Because the pressurized cylinder 22 is slim, the piston rod is easily bent and deformed when being pressurized by using a common piston. The inner wall of the pressure receiving cylinder 22 and the outer wall of the plunger are both processed with high precision so as to improve the testing precision of the tested valve.
Further preferably, the pressurized cylinder 22 further comprises a sealing unit 24 for preventing liquid in the rodless cavity of the pressurized cylinder 22 from leaking out. As shown in fig. 1, the sealing unit 24 is, for example, a plurality of sealing rings provided on the plunger and at the inlet and outlet of the cylinder body of the pressure-receiving cylinder 22. It is further preferred that the liquid in the rodless chamber of the pressurized cylinder 22 is provided as oil, which is the same as the oil in the tested valve.
Preferably, the leak test apparatus further includes a pressure control unit and a direction control unit connected in series between the power unit 1 and the test unit 2. Wherein, the direction control unit is used for controlling the flow direction of the fluid in the pressurizing cylinder 21; the pressure control unit is used to adjust the working pressure of the pressurizing cylinder 21.
Preferably, the pressure control unit includes a pressure reducing valve 31 connected between the power unit 1 and the pressurizing cylinder 21 for controlling the operating pressure of the pressurizing cylinder 21. The pressure of the high-pressure fluid from the power unit 1 flowing into the pressure cylinder 21 can be adjusted by the pressure reducing valve 31.
Preferably, the control unit includes a direction change valve 32 connected between the pressure reducing valve 31 and the pressurizing cylinder 21 for changing a flow direction of the fluid in the pressurizing cylinder 21.
Preferably, the reversing valve 32 is a three-position four-way valve, as in the embodiment shown in fig. 1, the fluid of the pressure cylinder 21 is used for the power unit 1, the power unit 1 is an air pump, the reversing valve 32 is a three-position four-way valve, when the first working position is switched on, the oil or air is fed into the rod cavity of the pressure cylinder 21, and the air is exhausted from the rod cavity of the pressure cylinder 21; when the second working position is switched on, the rod cavity of the pressurizing cylinder 21 and the rodless cavity of the pressurizing cylinder 21 are both in a pressure maintaining state; when the third working position is switched on, oil or gas enters the rodless cavity of the pressurizing cylinder 21, and gas is exhausted from the rod cavity of the pressurizing cylinder 21.
The leak testing device further comprises a connector 5 connected to the rodless cavity of the pressure-receiving cylinder 22 for connecting the tested element 4. During testing, the element 4 to be tested communicates with the pressure receiving cylinder 22 through the joint 5. It is further preferred that the coupling 5 is provided as a quick-change coupling that can be quickly disassembled.
Preferably, the leak test apparatus further includes a gas discharge unit 25 fixed to the pressurized cylinder 22 for discharging gas inside the pressurized cylinder 22. In the embodiment shown in fig. 1, at the time of testing, the rodless chamber of the pressurized cylinder 22 needs to be filled with oil, which may be injected before testing, to test the amount of leakage from the valve under test. To ensure that the test is not affected by the gas remaining in the rodless chamber of the pressurized cylinder, the residual gas needs to be vented out of pressurized cylinder 22.
Preferably, the air bleeding unit 2 is provided as an automatic air bleeding valve. The automatic air release valve only discharges air and does not discharge liquid by utilizing the difference of the viscosity of the air and the viscosity of the liquid. Thus, when the pressure cylinder 21 is pressurized, the gas is automatically discharged when the gas exists in the pressure cylinder 22, and when the gas is completely discharged, the oil in the pressure cylinder 2 automatically closes the outlet of the automatic release valve. Preferably, the automatic purge valve is fixed at an end of the pressurized cylinder 22 facing away from the pressurized cylinder 21. Thus, during the test, the pressure cylinder 22 is located at the upper part of the pressure cylinder 21, the automatic release valve is located at the uppermost part of the pressure cylinder 22, and the gas floats on the oil liquid due to the difference in density between the gas and the liquid, so that the gas can be better discharged out of the pressure cylinder 22.
Further preferably, the leakage testing device further comprises a recovery oil tank 6, the recovery oil tank 6 is connected behind the tested valve 4, and the leaked oil liquid is tested and flows into the recovery oil tank 6 to be recovered, so that the device is environment-friendly and economical.
The second aspect of the invention provides a leakage test method, apply the pressure equal to working pressure of the unit 4 tested through the pressurized cylinder 21, then pressurize, after the leakage amount is stabilized, the communicating T port of the cavity with rod of the pressurized cylinder 21, the cavity without rod of the pressurized cylinder 21 communicates the pressure unit 1; with the leakage of the unit under test 4, the piston rod of the pressurizing cylinder 21 and the moving rod of the pressure receiving cylinder 22 start to move together toward the pressure receiving cylinder 22 side, the displacement amount of the piston rod and/or the moving rod is recorded for a certain period of time, and the leakage amount in the period of time is derived from the displacement amount.
With the leak test apparatus of one embodiment as shown in fig. 1, the test method is as follows:
the method comprises the steps of preparing before testing, filling oil into a flow passage in a tested valve 4 as much as possible, connecting an oil inlet of the tested valve 4 with a testing pipeline by using a quick-change connector 5, enabling a pressurizing cylinder 21 to be at the lowest end, starting an air pump, enabling the pressure of an outlet of the pressure reducing valve 3 to be in accordance with preset testing pressure set by the tested valve 4 after the oil pump passes through the pressure reducing valve 3, enabling a reversing valve 32 to be an electromagnetic reversing valve, electrifying the electromagnetic reversing valve, reversing the electromagnetic reversing valve from a middle position, enabling compressed air to enter a rodless cavity of the pressurizing cylinder 21, deflating a rod cavity of the pressurizing cylinder 21, automatically exhausting air in a pressurized cylinder 22 by an air exhausting unit 25 through an automatic air exhausting valve, recording the initial position of a plunger by a measuring unit 23 through a grating ruler after leakage quantity is stabilized, starting timing, continuously recording the position of the plunger changing along with time in the leakage testing process, measuring the position of the plunger after timing is finished, enabling the reversing valve 32 to be an electromagnetic reversing valve to return.
According to the internal leakage test method, the pressurizing cylinder 21 and the pressure receiving cylinder 22 are connected in series in a mode that the piston rod of the pressurizing cylinder 21 and the moving rod of the pressure receiving cylinder 22 are fixedly connected, so that the piston rod of the pressurizing cylinder 21 and the moving rod of the pressure receiving cylinder 22 can simultaneously axially move, the leakage amount of the tested valve can be obtained according to the moving amount of the connected moving rod and piston rod, the test and measurement accuracy is high, continuous test can be realized, and the internal leakage test method is simple in structure and easy to implement.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, for example, the air pump can be changed to an oil pump. Including the various specific features, are combined in any suitable manner, for example, a three-position, four-way reversing valve may take other forms of reversing valve. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (13)
1. The leakage testing device is characterized by comprising a pressurizing cylinder (21) and a pressure receiving cylinder (22) communicated with a tested valve (4), wherein a piston rod of the pressurizing cylinder (21) is connected with a moving rod of the pressure receiving cylinder (22) in series, so that the piston rod of the pressurizing cylinder (21) is driven to axially move when axially moving, or the moving rod of the pressure receiving cylinder (22) is driven to axially move, and the piston rod of the pressurizing cylinder (21) is driven to axially move when axially moving.
2. The leak testing device according to claim 1, further comprising a measuring unit (23) for measuring the displacement stroke of the displacement rod and/or the piston rod.
3. The leak testing device according to claim 1, characterized in that the inner diameter of the cylinder body of the pressurized cylinder (21) is larger than the inner diameter of the cylinder body of the pressurized cylinder (22).
4. A leak testing device according to claim 3, characterized in that the rodless cavity of the pressure cylinder (21) and the rodless cavity of the pressure cylinder (22) are not in communication.
5. The leak testing device according to claim 4, characterized in that the pressure-loaded cylinder (22) is arranged as a plunger cylinder and the moving rod is arranged as a plunger.
6. The leak test apparatus according to claim 1, wherein the pressurized cylinder (22) further comprises a sealing unit (24) for preventing liquid in the rodless cavity of the pressurized cylinder (22) from leaking out.
7. The leak testing device according to claim 1, characterized in that it further comprises a pressure control unit and a direction control unit connected in series between the power unit (1) and the testing unit (2).
8. The leak testing device according to claim 7, characterized in that the pressure control unit comprises a pressure reducing valve (31) connected between the power unit (1) and the pressure cylinder (21) for controlling the working pressure of the pressure cylinder (21).
9. The leak testing device according to claim 8, characterized in that the control unit comprises a directional valve (32) connected between the pressure reducing valve (31) and the pressure cylinder (21) for changing the flow direction of the fluid in the pressure cylinder (21).
10. The leak testing apparatus according to claim 1, further comprising a gas discharge unit (25) fixed to the pressurized cylinder (22) for discharging gas inside the pressurized cylinder (22).
11. The leak testing device according to claim 10, characterized in that the air bleeding unit (2) is arranged as an automatic air bleeding valve.
12. The leak testing apparatus according to claim 11, characterized in that the automatic purge valve is fixed at the end of the pressurized cylinder (22) facing away from the pressurized cylinder (21).
13. The internal leakage test method is characterized in that pressure equal to the working pressure of a tested unit (4) is applied through a pressurizing cylinder (21), then pressure maintaining is carried out, after the leakage amount is stable, a communicating T port of a rod cavity of the pressurizing cylinder (21) is carried out, and a rodless cavity of the pressurizing cylinder (21) is communicated with a pressure unit 1; along with the leakage of the tested unit (4), the piston rod of the pressurizing cylinder (21) and the movable rod of the pressure receiving cylinder (22) start to move towards the pressure receiving cylinder (22) side together, the displacement of the piston rod and/or the movable rod is recorded within a certain time period, and the leakage amount in the time period is obtained according to the displacement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910891649.XA CN110702337A (en) | 2019-09-20 | 2019-09-20 | Leak test device and leak test method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910891649.XA CN110702337A (en) | 2019-09-20 | 2019-09-20 | Leak test device and leak test method |
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| CN201910891649.XA Pending CN110702337A (en) | 2019-09-20 | 2019-09-20 | Leak test device and leak test method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111779918A (en) * | 2020-07-10 | 2020-10-16 | 浙江汇之秋科技发展有限公司 | Pipeline plugging device and method for detecting sealing performance of STD series check valves by using same |
| CN113029452A (en) * | 2021-04-12 | 2021-06-25 | 浙江银轮机械股份有限公司 | Leakage amount detection device |
| CN114323452A (en) * | 2021-12-28 | 2022-04-12 | 华南蓝天航空油料有限公司 | Aircraft oil filling pipeline pressure testing method |
| CN115165254A (en) * | 2022-06-30 | 2022-10-11 | 中联重科股份有限公司 | Concrete pumping unit leak detection device and leak detection method |
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| CN111779918A (en) * | 2020-07-10 | 2020-10-16 | 浙江汇之秋科技发展有限公司 | Pipeline plugging device and method for detecting sealing performance of STD series check valves by using same |
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| CN113029452B (en) * | 2021-04-12 | 2024-06-25 | 浙江银轮机械股份有限公司 | Leakage amount detection device |
| CN114323452A (en) * | 2021-12-28 | 2022-04-12 | 华南蓝天航空油料有限公司 | Aircraft oil filling pipeline pressure testing method |
| CN115165254A (en) * | 2022-06-30 | 2022-10-11 | 中联重科股份有限公司 | Concrete pumping unit leak detection device and leak detection method |
| CN115165254B (en) * | 2022-06-30 | 2025-03-11 | 中联重科股份有限公司 | Leak detection device and method for concrete pumping unit |
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Application publication date: 20200117 |