CN112834130A - High pressure and vacuum circuit leakproofness testing arrangement - Google Patents

High pressure and vacuum circuit leakproofness testing arrangement Download PDF

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Publication number
CN112834130A
CN112834130A CN202011622061.3A CN202011622061A CN112834130A CN 112834130 A CN112834130 A CN 112834130A CN 202011622061 A CN202011622061 A CN 202011622061A CN 112834130 A CN112834130 A CN 112834130A
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pressure
vacuum
loop
tightness
product
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陈新举
何贝贝
龚甲伟
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Hubei Chengsheng Measurement And Control Technology Co ltd
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Hubei Chengsheng Measurement And Control Technology Co ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26Investigating 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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Abstract

The invention relates to a device for testing the tightness of a high-pressure loop and a vacuum loop, which comprises a control panel, a data acquisition card and a direct-current power supply, and also comprises a vacuum pump, a high-pressure gas source, and a first vacuum loop and a first high-pressure loop which are respectively used for measuring the vacuum tightness and the high-pressure tightness of a first product to be tested; the vacuum pump, the first vacuum loop and the first product to be detected are connected in sequence; the first vacuum loop comprises a first vacuum solenoid valve, a first negative pressure sensor and a second vacuum solenoid valve which are connected in sequence; the high-pressure air source, the first high-pressure loop and the first product to be detected are connected in sequence; the first high-pressure loop comprises a first high-pressure electromagnetic valve, a second pressure sensor and a first switching electromagnetic valve which are sequentially connected. The device has the advantages of simple structure, reasonable design, good practicability, high automation degree and wide application range, can meet the sealing performance test of the first product to be tested under high-pressure and vacuum working conditions, and is high in test accuracy and convenient to operate.

Description

High pressure and vacuum circuit leakproofness testing arrangement
Technical Field
The invention belongs to the technical field of tightness testing equipment, and particularly relates to a high-pressure and vacuum loop tightness testing device.
Background
The tightness tester is also called as an air tightness detector or a leakage tester, and is mainly suitable for sealing tests of packaging bags, bottles, pipes, tanks, boxes and the like in the industries of food, pharmacy, medical instruments, daily chemicals, automobiles, electronic components, stationery and the like. The tightness tester can be divided into the following two types according to different testing principles: a negative pressure method tightness tester (adopting a vacuumizing test method) and a positive pressure method tightness tester (adopting a positive pressure method inflation principle). Wherein, the measuring principle of the negative pressure method leakproofness tester is: vacuumizing the vacuum chamber to generate internal and external pressure difference on the sample immersed in water, and observing the escape condition of gas in the sample so as to judge the sealing performance of the sample; the vacuum chamber is vacuumized, so that the sample generates internal and external pressure difference, and the sample shape recovery condition after the sample expands and releases vacuum is observed, so that the sealing performance of the sample is judged.
That is to say, in the testing process of the existing negative pressure method tightness tester, a specially-assigned person is needed to watch to observe the escape condition of the gas in the sample or the shape recovery condition of the sample after the sample expands and releases vacuum, and the sealing performance of the sample is judged manually. Therefore, the existing negative pressure method tightness tester has the problems of complex operation, more artificial influence factors, low test accuracy and the like.
Moreover, one existing tightness tester can only meet the tightness test of products under high-pressure or vacuum working conditions, but cannot meet the tightness test of products under high-pressure and vacuum working conditions. When the tightness of a product under high-pressure and vacuum working conditions needs to be tested, at least two existing tightness testers are needed. Therefore, the existing tightness tester has the defect of narrow application range.
In addition, one current leakproofness tester can only detect a product at the same time, and efficiency is difficult to improve, seriously influences production efficiency and cost.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the high-pressure and vacuum loop tightness testing device which is simple to operate, wide in application range and high in testing accuracy.
The technical scheme for solving the technical problems is as follows:
the high-pressure and vacuum loop tightness testing device comprises a control panel, a data acquisition card and a direct-current power supply, and also comprises a vacuum pump, a high-pressure air source, a first vacuum loop and a first high-pressure loop, wherein the first vacuum loop and the first high-pressure loop are respectively used for measuring the vacuum and high-pressure tightness of a first product to be tested; the vacuum pump, the first vacuum loop and the first product to be detected are connected in sequence; the first vacuum loop comprises a first vacuum solenoid valve, a first negative pressure sensor and a second vacuum solenoid valve which are connected in sequence; the high-pressure air source, the first high-pressure loop and the first product to be detected are connected in sequence; the first high-pressure loop comprises a first high-pressure electromagnetic valve, a second pressure sensor and a first switching electromagnetic valve which are sequentially connected.
The invention has the beneficial effects that: the device has the advantages of simple structure, reasonable design, good practicability, high automation degree and wide application range, can meet the sealing performance test of the first product to be tested under high-pressure and vacuum working conditions, and is high in test accuracy and convenient to operate.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the testing device also comprises a second vacuum loop for measuring the vacuum tightness of a second product to be tested; the second vacuum loop is connected with the first vacuum loop in parallel and then connected with the vacuum pump in series; the second vacuum loop comprises a third vacuum solenoid valve, a second negative pressure sensor and a fourth vacuum solenoid valve which are connected in sequence.
Further, a first filter and a digital display negative pressure gauge are installed between the vacuum pump and the first vacuum loop and the second vacuum loop.
Further, the measuring device also comprises a second high-pressure loop used for measuring the high-pressure tightness of a second product to be measured; the second high-pressure loop is connected with the first high-pressure loop in parallel and then connected with a high-pressure air source in series; the second high-pressure loop comprises a second high-pressure electromagnetic valve, a third pressure sensor and a second conversion electromagnetic valve which are sequentially connected.
Further, a first pressure sensor is arranged between the high-pressure air source and the first high-pressure loop and between the high-pressure air source and the second high-pressure loop.
Further, the high-pressure air source comprises a reserved normal-pressure air source, a pressure increasing valve, a first air storage tank, a second pressure reducing valve and a second air storage tank which are connected in sequence.
Further, a second filter, a first pressure reducing valve and an oil mist separator are arranged between the reserved normal pressure air source and the pressure increasing valve.
Further, the first air storage tank is a 20L air storage tank, and the second air storage tank is a 30L air storage tank.
Further, the high-pressure air source comprises a reserved high-pressure air source and a second air storage tank which are connected in sequence.
Further, the control panel comprises a digital display pressure gauge.
The beneficial effect of adopting above-mentioned further scheme is through setting up the second vacuum circuit parallelly connected with first vacuum circuit, the second high-pressure circuit parallelly connected with first high-pressure circuit, realizes the test of leakproofness under the second product high pressure that awaits measuring and the vacuum operating mode, thereby makes testing arrangement can detect two products at the same time, is showing improvement production efficiency, reduction in production cost.
Drawings
Fig. 1 is a gas path diagram of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a vacuum pump, 11, a first filter, 12, a digital display negative pressure gauge, 2, a first vacuum circuit, 21, a first vacuum solenoid valve, 22, a second vacuum solenoid valve, 23, a first negative pressure sensor, 3, a second vacuum circuit, 31, a third vacuum solenoid valve, 32, a fourth vacuum solenoid valve, 33, a second negative pressure sensor, 4, a high pressure air source, 41, a first pressure sensor, 42, a reserved normal pressure air source, 421, a second filter, 422, a first pressure reducing valve, 423, an oil mist separator, 43, a booster valve, 44, a first air storage tank, 45, a second pressure reducing valve, 46, a second air storage tank, 47, a reserved high pressure air source, 5, a first high pressure circuit, 51, a first conversion solenoid valve, 52, a second pressure sensor, 6, a second high pressure circuit, 61, a second conversion solenoid valve, 62, a third pressure sensor, 7, a digital display pressure gauge, 8, a third pressure sensor, A first product to be tested, 9, a second product to be tested.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
It should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are intended to be construed broadly, as if they were connected either fixedly or removably, or as integrally formed structures. To those of ordinary skill in the art, the specific meaning of such terms in this patent may be understood as appropriate.
Example 1
The device for testing the tightness of the high-pressure loop and the vacuum loop designed by the embodiment comprises a control panel, a data acquisition card and a direct-current power supply, and further comprises a vacuum pump 1, a high-pressure air source 4, and a first vacuum loop 2 and a first high-pressure loop 5 which are respectively used for measuring the vacuum tightness and the tightness of a first product 8 to be tested. The vacuum pump 1, the first vacuum loop 2 and the first product to be detected 8 are connected in sequence; the first vacuum circuit 2 includes a first vacuum solenoid valve 21, a first negative pressure sensor 23, and a second vacuum solenoid valve 22, which are connected in this order. The high-pressure air source 4, the first high-pressure loop 5 and the first product to be detected 8 are connected in sequence; the first high-pressure circuit 5 includes a first high-pressure solenoid valve, a second pressure sensor 52, and a first switching solenoid valve 51, which are connected in this order. The high-pressure air source 4 comprises a reserved high-pressure air source 47 and a second air storage tank 46 which are connected in sequence.
This embodiment testing arrangement simple structure, reasonable in design, the practicality is good, degree of automation is high, and application scope is wide, can satisfy the test of the leakproofness under 8 high pressures of first product and the vacuum condition of waiting to survey, and the test accuracy is high, the simple operation.
Example 2
As shown in fig. 1, the device for testing the tightness of the high-pressure and vacuum loops designed in this embodiment includes a control panel, a data acquisition card and a dc power supply, and further includes a vacuum pump 1, a high-pressure air source 4, a first vacuum loop 2 and a first high-pressure loop 5 for measuring the vacuum and high-pressure tightness of a first product 8 to be tested, respectively, and a second vacuum loop 3 and a second high-pressure loop 6 for measuring the vacuum and high-pressure tightness of a second product 9 to be tested, respectively. In this embodiment, the first product to be tested 8 and the second product to be tested 9 are a first air chamber and a second air chamber, respectively.
The vacuum pump 1, the first vacuum loop 2 and the first product to be detected 8 are connected in sequence; the first vacuum circuit 2 includes a first vacuum solenoid valve 21, a first negative pressure sensor 23, and a second vacuum solenoid valve 22, which are connected in this order. The second vacuum loop 3 is connected with the first vacuum loop 2 in parallel and then connected with the vacuum pump 1 in series; the second vacuum circuit 3 includes a third vacuum solenoid valve 31, a second negative pressure sensor 33, and a fourth vacuum solenoid valve 32, which are connected in this order. A first filter 11 and a digital display negative pressure gauge 12 are installed between the vacuum pump 1 and the first and second vacuum circuits 2 and 3.
The high-pressure air source 4, the first high-pressure loop 5 and the first product to be detected 8 are connected in sequence; the first high-pressure circuit 5 includes a first high-pressure solenoid valve, a second pressure sensor 52, and a first switching solenoid valve 51, which are connected in this order. The second high-pressure loop 6 is connected with the first high-pressure loop 5 in parallel and then is connected with the high-pressure air source 4 in series; the second high-pressure circuit 6 includes a second high-pressure solenoid valve, a third pressure sensor 62, and a second switching solenoid valve 61, which are connected in sequence. A first pressure sensor 41 is arranged between the high-pressure air source 4 and the first high-pressure loop 5 and the second high-pressure loop 6.
The high-pressure air source 4 comprises a reserved normal-pressure air source 42, a pressure increasing valve 43, a first air storage tank 44, a second pressure reducing valve 45 and a second air storage tank 46 which are connected in sequence. The model of the pressure increasing valve 43 is VBA43A-04GN, and the model of the second pressure reducing valve 45 is AR 40-04H. The first air storage tank 44 is a 20L air storage tank, and the second air storage tank 46 is a 30L air storage tank.
The control panel comprises a digital display pressure gauge 7.
The working principle of the testing device in this embodiment is as follows:
1) measurement of vacuum tightness:
s1, displaying a high-pressure/vacuum measurement option by a control panel, and selecting a vacuum gear measurement environment;
s2, switching the first switching electromagnetic valve 51 and the second switching electromagnetic valve 61 to be normally closed, and closing the first high-pressure loop 5 and the second high-pressure loop 6;
s3, opening a first vacuum electromagnetic valve 21, a second vacuum electromagnetic valve 22, a third vacuum electromagnetic valve 31 and a fourth vacuum electromagnetic valve 32, and starting a first vacuum loop 2 and a second vacuum loop 3;
s4, starting the vacuum pump 1 by a program, starting vacuumizing, and closing the first vacuum electromagnetic valve 21 and the third vacuum electromagnetic valve 31 after vacuumizing to a set value;
s5, the testing device automatically measures the vacuum tightness of the first product to be tested 8 and the second product to be tested 9 in real time;
and S6, finishing measurement. Waiting for the next start.
In the embodiment, the air source controller of the testing device is connected with the existing upper computer (industrial personal computer). The operation interface of the control panel is as follows (including the following, but not representing the final interface):
Figure BDA0002878539480000061
□ denotes a settable program segment and √ denotes a program segment that is selected for operation.
Remarking: the function options of the control panel are added and modified according to actual needs so as to be convenient to operate.
2) Measurement of high-pressure sealability:
s1, displaying a high-voltage/vacuum measurement option by a control panel, and selecting a high-voltage gear measurement environment;
s2, switching the second vacuum electromagnetic valve 22 and the fourth vacuum electromagnetic valve 32 to be normally closed, and closing the first vacuum loop 2 and the second vacuum loop 3;
s3, opening a first high-pressure electromagnetic valve, a second high-pressure electromagnetic valve, a first conversion electromagnetic valve 51 and a second conversion electromagnetic valve 61, and starting a first high-pressure loop 5 and a second high-pressure loop 6;
s4, starting a high-pressure air source 4 by a program, starting inflation, and closing the first high-pressure electromagnetic valve and the second high-pressure electromagnetic valve after the inflation reaches a set value;
s5, the testing device automatically measures the high-pressure sealing performance of the first product to be tested 8 and the second product to be tested 9 in real time;
and S6, finishing measurement. Waiting for the next start.
This embodiment testing arrangement simple structure, reasonable in design, the practicality is good, degree of automation is high, and application scope is wide, can detect two products at the same time, can satisfy the test of first product 8, the second product 9 high pressure that awaits measuring and leakproofness under the vacuum condition promptly, is showing improvement production efficiency, reduction in production cost, and the test accuracy is high, the simple operation.
Example 3
As shown in fig. 1, on the basis of embodiment 2, a second filter 421, a first pressure reducing valve 422 and an oil mist separator 423 are installed between the reserved normal pressure air source 42 and the pressure increasing valve 43, so as to improve the testing accuracy of the sealing performance under the high-pressure working condition of the product, and further improve the testing accuracy and the service life of the testing device.
The mechanisms, components and parts of the invention which are not described in the specific structure are the existing structures existing in the prior art and can be directly purchased from the market.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. The device for testing the tightness of the high-pressure loop and the vacuum loop comprises a control panel, a data acquisition card and a direct-current power supply, and is characterized by further comprising a vacuum pump (1), a high-pressure gas source (4), a first vacuum loop (2) and a first high-pressure loop (5) which are respectively used for measuring the vacuum tightness and the tightness of the high-pressure loop of a first product to be tested (8);
the vacuum pump (1), the first vacuum loop (2) and the first product to be detected (8) are connected in sequence; the first vacuum loop (2) comprises a first vacuum electromagnetic valve (21), a first negative pressure sensor (23) and a second vacuum electromagnetic valve (22) which are connected in sequence;
the high-pressure air source (4), the first high-pressure loop (5) and the first product to be detected (8) are connected in sequence; the first high-pressure circuit (5) comprises a first high-pressure electromagnetic valve, a second pressure sensor (52) and a first switching electromagnetic valve (51) which are sequentially connected.
2. A testing device according to claim 1, characterized in that it further comprises a second vacuum circuit (3) for measuring the vacuum tightness of a second product under test (9); the second vacuum loop (3) is connected with the first vacuum loop (2) in parallel and then is connected with the vacuum pump (1) in series; the second vacuum loop (3) comprises a third vacuum solenoid valve (31), a second negative pressure sensor (33) and a fourth vacuum solenoid valve (32) which are connected in sequence.
3. Testing device according to claim 2, characterized in that a first filter (11) and a digital display negative pressure gauge (12) are installed between the vacuum pump (1) and the first (2) and second (3) vacuum circuit.
4. A testing device according to claim 1, characterized in that the measuring device further comprises a second high-pressure circuit (6) for measuring the high-pressure tightness of a second product under test (9); the second high-pressure loop (6) is connected with the first high-pressure loop (5) in parallel and then is connected with the high-pressure air source (4) in series; the second high-pressure loop (6) comprises a second high-pressure electromagnetic valve, a third pressure sensor (62) and a second switching electromagnetic valve (61) which are sequentially connected.
5. A test device according to claim 4, characterized in that a first pressure sensor (41) is mounted between the high-pressure gas source (4) and the first (5) and second (6) high-pressure circuits.
6. The testing device according to claim 1, wherein the high-pressure air source (4) comprises a reserved normal-pressure air source (42), a pressure increasing valve (43), a first air storage tank (44), a second pressure reducing valve (45) and a second air storage tank (46) which are connected in sequence.
7. A testing device according to claim 6, characterized in that a second filter (421), a first pressure reducing valve (422) and an oil mist separator (423) are installed between the reserve atmospheric air source (42) and the pressure increasing valve (43).
8. The testing device of claim 6, wherein the first reservoir (44) is a 20L reservoir and the second reservoir (46) is a 30L reservoir.
9. Testing device according to claim 1, characterized in that said high-pressure air source (4) comprises a reserve high-pressure air source (47) and a second air reservoir (46) connected in series.
10. A testing device according to claim 1, characterized in that the control panel comprises a digital pressure gauge (7).
CN202011622061.3A 2020-12-31 2020-12-31 High pressure and vacuum circuit leakproofness testing arrangement Pending CN112834130A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201867290U (en) * 2010-10-29 2011-06-15 上海德尔福汽车空调系统有限公司 Air tightness testing device for automobile air-conditioning box
CN203216689U (en) * 2013-04-11 2013-09-25 杭州三速科技有限公司 Detection system for testing sealing performance of valves
CN203337345U (en) * 2013-05-15 2013-12-11 中航锂电(洛阳)有限公司 Air tightness detection device
CN205898473U (en) * 2016-08-16 2017-01-18 苏州金华润泽能源有限公司 A malleation and vacuum testing arrangement for liquefied natural gas tank wagon
CN108918045A (en) * 2018-05-30 2018-11-30 广东鸿图武汉压铸有限公司 leakage testing system and method
CN109506924A (en) * 2018-12-27 2019-03-22 宁波加凯汽车部件有限公司 Coolant liquid pot lid detection device and its detection method
CN208635980U (en) * 2018-06-22 2019-03-22 浙江富铭工业机械有限公司 A kind of positive/negative-pressure leakage rate detector
CN210834054U (en) * 2019-10-23 2020-06-23 杭州勤鹄智能设备有限公司 Air tightness test device for through passage system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201867290U (en) * 2010-10-29 2011-06-15 上海德尔福汽车空调系统有限公司 Air tightness testing device for automobile air-conditioning box
CN203216689U (en) * 2013-04-11 2013-09-25 杭州三速科技有限公司 Detection system for testing sealing performance of valves
CN203337345U (en) * 2013-05-15 2013-12-11 中航锂电(洛阳)有限公司 Air tightness detection device
CN205898473U (en) * 2016-08-16 2017-01-18 苏州金华润泽能源有限公司 A malleation and vacuum testing arrangement for liquefied natural gas tank wagon
CN108918045A (en) * 2018-05-30 2018-11-30 广东鸿图武汉压铸有限公司 leakage testing system and method
CN208635980U (en) * 2018-06-22 2019-03-22 浙江富铭工业机械有限公司 A kind of positive/negative-pressure leakage rate detector
CN109506924A (en) * 2018-12-27 2019-03-22 宁波加凯汽车部件有限公司 Coolant liquid pot lid detection device and its detection method
CN210834054U (en) * 2019-10-23 2020-06-23 杭州勤鹄智能设备有限公司 Air tightness test device for through passage system

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Application publication date: 20210525