CN103471775A - Method for testing pressure withstanding sealing performance of sleeve compensators - Google Patents
Method for testing pressure withstanding sealing performance of sleeve compensators Download PDFInfo
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- CN103471775A CN103471775A CN 201310416054 CN201310416054A CN103471775A CN 103471775 A CN103471775 A CN 103471775A CN 201310416054 CN201310416054 CN 201310416054 CN 201310416054 A CN201310416054 A CN 201310416054A CN 103471775 A CN103471775 A CN 103471775A
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- inner tube
- expansion joint
- sleeve expansion
- blind plate
- sleeve
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Abstract
The invention discloses a method for testing the pressure withstanding sealing performance of sleeve compensators. The method includes the following steps: enabling outer tubes and inner tubes of the sleeve compensators to be sealed, fixing the outer tubes, injecting water into the interiors of the sleeve compensators, pressurizing the water, and driving the inner tubes to move. The method is characterized in that the method for sealing the outer tubes and the inner tubes of the sleeve compensators comprises the steps of taking the two sleeve compensators from one production batch, enabling the outer tubes of the sleeve compensators to be connected in a butt welding mode, enabling the sleeve compensators after outer tube welding to form the left inner tube and the right inner tube, welding blind plates on tube openings of the left inner tube and the right inner tube respectively, pulling out the left inner tube by a certain length, pressing the right inner tube by a certain length, arranging a locating device between the blind plates to enable the left inner tube and the right inner tube not to have relative displacement, forming a water injection opening in the blind plate of the right inner tube, and arranging an air exhausting tube on the blind plate of the right inner tube. When testing is carried out, the outer tubes are fixed, the left inner tube and the right inner tube synchronously move, the pressure inside the sleeve compensators is not influenced by movement of the inner tubes, the pressure inside the sleeve compensators can be kept constant all the time during the testing process, and the accuracy of testing results is guaranteed.
Description
Technical field
The present invention relates to a kind of test method of sleeve expansion joint, the method is for checking the pressure-resistant seal performance of sleeve expansion joint.
Background technology
Sleeve expansion joint is used in heating network, compensates the length variations of heat distribution pipeline because expanding with heat and contract with cold and producing, to guarantee the safe operation of heating network.Sleeve expansion joint mainly contains outer tube, inner tube and airtight and watertight padding and forms, and described inner tube one end is inserted within the outer tube, and the other end of inner tube is stretched the outside at outer tube, filling airtight and watertight padding between inner and outer tubes, and the two ends of sleeve expansion joint are connected with heat distribution pipeline.When the length of heat distribution pipeline changes, produce relative displacement between the inner and outer tubes of sleeve expansion joint, reach the purpose to the heat distribution pipeline compensation.When inner tube moves, the outer wall of inner tube and airtight and watertight padding form friction, make airtight and watertight padding produce wearing and tearing and the pressure-resistant seal performance of reduction sleeve expansion joint, and when the number of times of friction reaches certain value, sleeve expansion joint can be hindered the depressurization performance.For guaranteeing the quality of sleeve expansion joint, must be tested its pressure-resistant seal performance.
Existing test method is, by the outer tube of the outer tube of sleeve expansion joint and interior duct occlusion → fixedly → move to the inner tube of pressurizeing → drive of water filling in sleeve expansion joint, when inner tube moves number of times and reaches setting, sleeve expansion joint is qualified without product leakage; The weak point of the method is, space when inner tube moves in compensator changes, its internal pressure also changes, for keeping the pressure in compensator constant, must adjust in time hydraulic pressure, adjustment control system complex structure and the follow-up characteristic of hydraulic pressure are poor, make the pressure in compensator be difficult to keep constant, the poor accuracy of test findings.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of test method of pressure-resistant seal performance of sleeve expansion joint is provided, and this test method can make to carry out friction test in sleeve expansion joint under the condition that keeps constant voltage, to check its pressure-resistant seal performance.
The step of this test method comprises:
By the outer tube of sleeve expansion joint and interior duct occlusion;
Fixing outer tube;
To water filling pressurization in sleeve expansion joint;
The driving inner tube moves;
It is characterized in that: method used in the step of the outer tube by sleeve expansion joint and interior duct occlusion is, get two sleeve expansion joints in a production batch, the outer tube butt welding of described sleeve expansion joint connects, after the outer tube welding, sleeve expansion joint forms a left inside pipe and a right inside pipe, the mouth of pipe of left and right inner tube welds respectively blind plate, and left inside pipe is pulled out certain length, and right inside pipe is compressed into certain length, one location device is set between described blind plate, makes between left and right inner tube without relative displacement; The blind plate of right inside pipe is provided with a water filling port and a gas outlet.
The method of described fixedly outer tube is, the outer tube of described sleeve expansion joint is fixed on a base, and the blind plate on left inside pipe is connected with a fluid pressure drive device;
The described method to water filling pressurization in sleeve expansion joint is, with a water pressure engine by described water filling port to water filling in sleeve expansion joint, when the water in sleeve expansion joint is full, close gas outlet, continuing to pressurize makes the interior pressure of sleeve expansion joint reach setting;
The method that described driving inner tube moves is to control fluid pressure drive device and make back and forth movement by certain stroke, when back and forth movement reaches certain number of times, sleeve expansion joint is without leakage, for test finishes, as not reaching the stipulated number sleeve expansion joint and leak, is defective off-test.
A kind of method that one location device is set between described blind plate is, with the rod iron of four equal lengths, symmetrically described blind plate to be welded to connect.
The another kind of method that one location device is set between described blind plate is, with four stud bolts, to pass described blind plate, the two sides nut screwing clamping of each blind plate.
The characteristics of this method are, the outer tube butt welding of described sleeve expansion joint connects, and after the outer tube welding, sleeve expansion joint forms a left inside pipe and a right inside pipe, at left inside pipe and right inside pipe, one location device is set, and makes between left and right inner tube without relative displacement; During test, outer tube is fixed, left and right inner tube synchronizing moving, the impact that the pressure in sleeve expansion joint is not moved by inner tube.Compared with prior art, this method can remain that in process of the test the compensator internal pressure is constant, has guaranteed the accuracy of test findings.
The accompanying drawing explanation
The structural representation that Fig. 1 is the present invention's test unit used.
Embodiment
Now contrast accompanying drawing explanation the specific embodiment of the present invention.
A kind of test method of pressure-resistant seal performance of sleeve expansion joint, its sequence of steps is:
Get two sleeve expansion joints in a production batch, outer tube 62,64 butt welding of described sleeve expansion joint connect, after the outer tube welding, sleeve expansion joint forms a left inside pipe 61 and a right inside pipe 63, the mouth of pipe of left and right inner tube welds respectively blind plate 51,52, left inside pipe is pulled out certain length, and right inside pipe is compressed into certain length, the rated displacement length that described length is sleeve expansion joint, one location device 4 is set between described blind plate, makes between left and right inner tube without relative displacement; The blind plate 52 of right inside pipe is provided with a water filling port 53 and a gas outlet 54:
The outer tube of described sleeve expansion joint is fixed on a base 1, the blind plate 51 on left inside pipe is connected with a fluid pressure drive device 2;
With a water pressure engine by described water filling port to water filling in sleeve expansion joint, when the water in sleeve expansion joint is full, close gas outlet, continue the water filling pressurization and make the pressure in sleeve expansion joint reach setting;
Control fluid pressure drive device and make to come and go rectilinear motion by certain stroke, described stroke is slightly less than the length that left inside pipe is drawn out, when back and forth movement reaches certain number of times, sleeve expansion joint is without leakage, for test finishes, as do not reach the stipulated number sleeve expansion joint and leak, be defective off-test.
Described blind plate is a square steel plate, and its length of side is greater than the external diameter of described inner tube.
When water filling in sleeve expansion joint, the gas outlet on the blind plate of right inside pipe is used for the air in emptying sleeve expansion joint, and the nozzle position of gas outlet is higher than the top of sleeve expansion joint, and gas outlet is provided with valve, valve-off when water is full
A kind of method that one location device 4 is set between described blind plate is, with the rod iron of four equal lengths, symmetrically described blind plate to be welded to connect.
The another kind of method that one location device 4 is set between described blind plate is that, with four stud bolts 41, through described blind plate, tighten with nut 42 on the two sides of each blind plate.
An outer effective hold down gag 3 of described sleeve expansion joint is fixed on base 1, and hold down gag 3 is by clip 32, and base 31 forms, base 31 is fixed on base, the outer tube of sleeve expansion joint is shelved on base, and clip covers outer tube and is connected with base, and outer tube is fastening.
Described fluid pressure drive device is fixed on base, and described base is an integral plate.
Claims (4)
1. the test method of the pressure-resistant seal performance of a sleeve expansion joint, comprise the steps:
By the outer tube of sleeve expansion joint and interior duct occlusion;
Fixing outer tube;
To water filling pressurization in sleeve expansion joint;
The driving inner tube moves;
It is characterized in that: method used in the step of the outer tube by sleeve expansion joint and interior duct occlusion is, get two sleeve expansion joints in a production batch, the outer tube butt welding of described sleeve expansion joint connects, after the outer tube welding, sleeve expansion joint forms a left inside pipe and a right inside pipe, the mouth of pipe of left and right inner tube welds respectively blind plate, and left inside pipe is pulled out certain length, and right inside pipe is compressed into certain length, one location device is set between described blind plate, makes between left and right inner tube without relative displacement; One water filling port and a gas outlet are set on the blind plate of right inside pipe.
2. test method according to claim 1, is characterized in that, the method that a location device is set between described blind plate is, with the rod iron of four equal lengths, symmetrically described blind plate to be welded to connect.
3. test method according to claim 1, is characterized in that, the method that a location device is set between described blind plate is, with four stud bolts, to pass described blind plate, the two sides nut screwing clamping of each blind plate.
4. test method according to claim 1, it is characterized in that, the described method to water filling pressurization in sleeve expansion joint is, with a water pressure engine by described water filling port to water filling in sleeve expansion joint, when the water in sleeve expansion joint is full, close gas outlet, continue pressurization and make the pressure in sleeve expansion joint reach setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310416054 CN103471775A (en) | 2013-09-05 | 2013-09-05 | Method for testing pressure withstanding sealing performance of sleeve compensators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310416054 CN103471775A (en) | 2013-09-05 | 2013-09-05 | Method for testing pressure withstanding sealing performance of sleeve compensators |
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|---|---|
| CN103471775A true CN103471775A (en) | 2013-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201310416054 Pending CN103471775A (en) | 2013-09-05 | 2013-09-05 | Method for testing pressure withstanding sealing performance of sleeve compensators |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132771A (en) * | 2019-05-27 | 2019-08-16 | 沈阳仪表科学研究院有限公司 | Compensator constant pressure fatigue tester |
| CN113188888A (en) * | 2021-04-21 | 2021-07-30 | 西安恒热热力技术有限责任公司 | Detection equipment and detection method for detecting pressure resistance of compensator |
-
2013
- 2013-09-05 CN CN 201310416054 patent/CN103471775A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132771A (en) * | 2019-05-27 | 2019-08-16 | 沈阳仪表科学研究院有限公司 | Compensator constant pressure fatigue tester |
| CN113188888A (en) * | 2021-04-21 | 2021-07-30 | 西安恒热热力技术有限责任公司 | Detection equipment and detection method for detecting pressure resistance of compensator |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131225 |
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| WD01 | Invention patent application deemed withdrawn after publication |