CN203422202U - Device of U-shaped capillary for performing positive pressure leak hole calibration - Google Patents
Device of U-shaped capillary for performing positive pressure leak hole calibration Download PDFInfo
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- CN203422202U CN203422202U CN201320529857.3U CN201320529857U CN203422202U CN 203422202 U CN203422202 U CN 203422202U CN 201320529857 U CN201320529857 U CN 201320529857U CN 203422202 U CN203422202 U CN 203422202U
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- Prior art keywords
- stop valve
- shaped
- kapillary
- pressure leak
- shaped capillary
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Abstract
The utility model provides a device of a U-shaped capillary for performing positive pressure leak hole calibration. The device comprises the U-shaped capillary, a first stop valve and a second stop valve. One end of the U-shaped capillary is communicated with atmosphere, and the other end is connected in series with a measured leak hole and the first stop valve in turn. The second stop valve is connected in parallel on a pipeline between the U-shaped capillary and the measured leak hole. The U-shaped capillary is internally filled with liquid. The device has advantages of being simple in structure, low in cost and high in efficiency.
Description
Technical field
The utility model relates to the device that a kind of U-shaped kapillary carries out PRESSURE LEAK CALIBRATION, relates in particular to a kind of device that uses U-shaped kapillary to carry out PRESSURE LEAK CALIBRATION, belongs to leak detection technology field.
Background technology
Along with the development of leak detection technology, in national defence and each field of national product, positive pressure leak detection technology is being brought into play more and more important effect, the leak rate standard of positive pressure leak hole during as positive pressure leak detection, and its calibration accuracy is also more and more subject to people's attention.A lot of to the calibration steps of malleation referance leak both at home and abroad at present, but be not that cost higher position is that efficiency is low.As level pressure, draining is got gas method and change to be obtained volume change and carry out Leak calibration by being recorded in the graduated cylinder water surface elevation of certain hour.Because graduated cylinder sectional area is large and leak hole leak rate is less, obtain the significant change of graduated cylinder water surface elevation needs the time longer, so efficiency is low.And constant volume diaphragm gauge method, owing to using diaphragm gauge, so cost is higher.
Summary of the invention
Problem to be solved in the utility model is to provide a kind of simple in structure, device that U-shaped kapillary that cost is low, efficiency is high carries out PRESSURE LEAK CALIBRATION.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of U-shaped kapillary carries out the device of PRESSURE LEAK CALIBRATION, comprises U-shaped kapillary and stop valve, and described stop valve comprises the first stop valve and the second stop valve; Described U-shaped one end capillaceous is communicated with atmosphere, and the other end and tested small opening, the first stop valve are connected in series successively; Described the second stop valve is connected in parallel on the pipeline between U-shaped kapillary and tested small opening; In described U-shaped kapillary, be filled with liquid.
Open the first stop valve, close the second stop valve simultaneously, the gas of known pressure is filled with in U-shaped kapillary by the first stop valve and small opening; Close the first stop valve, and record the liquid level position of U-shaped capillary liquid in pipe, and then change and try to achieve the unit interval and flow through the gas flow of small opening by liquid level, obtain the leak rate of small opening.
When tested Leak calibration is complete, the second stop valve is used for the gas in pipeline between U-shaped kapillary and the first stop valve to discharge; According to the difference of leak hole leak rate scope, can select the U-shaped kapillary of different diameters, to improve testing efficiency and accuracy.
Further, be connected in series a pressure regulator valve on the pipeline of described the first stop valve entrance point, a tensimeter is connected in parallel between described pressure regulator valve and the first stop valve; The gaseous tension at tested small opening place when pressure regulator valve and tensimeter can guarantee to be filled with gas, and then the accuracy of assurance measurement result.
Further, the liquid being filled with in described U-shaped kapillary is colored, and not volatile, so that observe the height change of liquid level.
Advantage and the good effect that the utlity model has are: this device is the method for testing of utilizing transformation transfiguration, by U-shaped kapillary liquid level height change, try to achieve the unit interval and flow through the gas flow of small opening, and then obtain the leak rate of small opening, have advantages of simple in structure, cost is low, efficiency is high.
Accompanying drawing explanation
Fig. 1 is the device schematic diagram in the utility model embodiment positive pressure leak hole school.
In figure: 1. pressure regulator valve, 2. tensimeter, 3. the first stop valve, 4. connecting pipe, 5. tested small opening, 6. the second stop valve, 7.U shape kapillary.
P-gas;
The U-shaped pipe both sides m of liquid level Cha， unit when h-test finishes;
H
1the relative initial position height change of liquid level when-test finishes, the m of unit;
Wherein, liquid level position when dotted line position starts for test in U-shaped kapillary, the position of liquid level when solid line partly finishes for test.
Embodiment
As shown in Figure 1, this specific embodiment is the device that a kind of U-shaped kapillary carries out PRESSURE LEAK CALIBRATION, comprises U-shaped kapillary 7, the first stop valve 3 and the second stop valve 6; One end of U-shaped kapillary 7 is communicated with atmosphere, and the other end and tested small opening 5, the first stop valve 3 are connected in series successively; The second stop valve 6 is connected in parallel on the pipeline between U-shaped kapillary 7 and tested small opening 5; On the pipeline of the first stop valve 3 entrance points, be connected in series a pressure regulator valve 1, a tensimeter 2 is connected in parallel between pressure regulator valve 1 and the first stop valve 3; U-shaped kapillary 7 band colors, not volatile liquid.
The course of work of this specific embodiment: as shown in Figure 1, first regulate pressure regulator valve 1 to the required pressure of tested small opening, close after the second stop valve 6, open the first stop valve 3, gas P inflates to U-shaped kapillary by small opening; When after △ t after a while, record liquid level position, and close the first stop valve 3, by liquid level, change and try to achieve the unit interval and flow through the gas flow of small opening, and then obtain the leak rate of small opening.
The formula that is calculated as follows of leak rate:
Wherein:
ρ-U-shaped kapillary internal liquid density, units/kg/m
3;
σ-U-shaped kapillary internal liquid coefficient of tension, the N/m of unit;
G-local gravitational acceleration;
D-U shape internal diameter capillaceous, the m of unit;
The U-shaped pipe both sides m of liquid level Cha， unit when h-test finishes;
H
1the relative initial position height change of liquid level when-test finishes, the m of unit;
θ
1the infiltration angle of U-shaped kapillary inner right side liquid level edge and tube wall in Fig. 1 when-test finishes;
θ
2the infiltration angle of U-shaped kapillary inside left liquid level edge and tube wall in Fig. 1 when-test finishes;
V
0when-test starts, initial gas volume between small opening coupling part and pressurization right side liquid level, the m of unit
3;
P
0atmospheric pressure when-test finishes, the Pa of unit;
Δ t-test duration timing, the s of unit;
The tested leak hole leak rate of Q-.
In formula: σ, θ
1, θ
2, ρ, P
0, V
0, d is known quantity, h, h
1with Δ t be test volume
Above an embodiment of the present utility model is had been described in detail, but described content is only preferred embodiment of the present utility model, can not be considered to for limiting practical range of the present utility model.All equalization variations of doing according to the utility model application range and improvement etc., within all should still belonging to patent covering scope of the present utility model.
Claims (4)
1. U-shaped kapillary carries out a device for PRESSURE LEAK CALIBRATION, comprises U-shaped kapillary and stop valve, it is characterized in that: described stop valve comprises the first stop valve and the second stop valve; Described U-shaped one end capillaceous is communicated with atmosphere, and the other end and tested small opening, the first stop valve are connected in series successively; Described the second stop valve is connected in parallel on the pipeline between U-shaped kapillary and tested small opening; In described U-shaped kapillary, be filled with liquid.
2. U-shaped kapillary according to claim 1 carries out the device of PRESSURE LEAK CALIBRATION, it is characterized in that: on the pipeline of described the first stop valve entrance point, be connected in series a pressure regulator valve.
3. U-shaped kapillary according to claim 2 carries out the device of PRESSURE LEAK CALIBRATION, it is characterized in that: a tensimeter is connected in parallel between described pressure regulator valve and the first stop valve.
4. U-shaped kapillary according to claim 1 carries out the device of PRESSURE LEAK CALIBRATION, it is characterized in that: the liquid being filled with in described U-shaped kapillary is colored, and not volatile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320529857.3U CN203422202U (en) | 2013-08-28 | 2013-08-28 | Device of U-shaped capillary for performing positive pressure leak hole calibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320529857.3U CN203422202U (en) | 2013-08-28 | 2013-08-28 | Device of U-shaped capillary for performing positive pressure leak hole calibration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203422202U true CN203422202U (en) | 2014-02-05 |
Family
ID=50021297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320529857.3U Expired - Lifetime CN203422202U (en) | 2013-08-28 | 2013-08-28 | Device of U-shaped capillary for performing positive pressure leak hole calibration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203422202U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439065A (en) * | 2013-08-28 | 2013-12-11 | 博益(天津)气动技术研究所有限公司 | Device for conducting positive pressure leaked-hole calibration on U-shaped capillary tube |
-
2013
- 2013-08-28 CN CN201320529857.3U patent/CN203422202U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439065A (en) * | 2013-08-28 | 2013-12-11 | 博益(天津)气动技术研究所有限公司 | Device for conducting positive pressure leaked-hole calibration on U-shaped capillary tube |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: TIANJIN BOYI PNEUMATIC TECHNOLOGY INSTITUTE CO., L Free format text: FORMER NAME: BOYI (TIANJIN) PNEUMATIC TECHNOLOGY INST. CO. LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 300457 Tianjin Binhai New Area Development Zone No. 80 ninth street Fenghua Industrial Park No. 7 Factory Patentee after: BOYI (TIANJIN) PNEUMATIC TECHNOLOGY INSTITUTE Co.,Ltd. Address before: 300457 Tianjin Binhai New Area Development Zone No. 80 ninth street Fenghua Industrial Park No. 7 Factory Patentee before: BOYI (TIANJIN) PNEUMATIC TECHNOLOGY RESEARCH INSTITUTE CO.,LTD. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20140205 |
|
| CX01 | Expiry of patent term |