CN215811476U - Flow type air tightness testing device - Google Patents
Flow type air tightness testing device Download PDFInfo
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- CN215811476U CN215811476U CN202122574596.4U CN202122574596U CN215811476U CN 215811476 U CN215811476 U CN 215811476U CN 202122574596 U CN202122574596 U CN 202122574596U CN 215811476 U CN215811476 U CN 215811476U
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- 238000012360 testing method Methods 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 46
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 230000007547 defect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The utility model provides a flow type air tightness testing device, which comprises: the gas tightness detection device comprises a gas input circuit, an exhaust circuit, a gas tightness detection circuit, a first measurement unit and a second measurement unit; the input end of the gas input loop is used for being connected with a gas pressure source, the output end of the gas input loop is connected with the input end of the gas tightness detection loop, the output end of the gas tightness detection loop is used for being connected with a standard end and a workpiece end, the exhaust loop is connected to the gas tightness detection loop, the first measuring unit is arranged on the gas tightness detection loop, and the second measuring unit is connected between the standard end and the input end of the gas tightness detection loop. The problem of among the prior art, wide range flowmeter precision is lower, can't satisfy the direct test to the hourglass of bulky work piece is solved.
Description
Technical Field
The utility model relates to the field of airtightness detection, in particular to a flow type airtightness testing device.
Background
Gas flow meters are instrumentation instruments of automated control systems that indicate the measured flow rate or total amount of fluid within a selected time interval. And in the flow meter detection mode, a method of instantaneous flow loss is adopted to carry out tightness test on the tested product. The main principle is that the leakage rate of the product is directly detected by using a sensor and is displayed in real time. The high-precision mass flowmeter adopts thermal measurement, leads gas to present stable molecular flow through a capillary, and calculates the molecular mass taken away by split molecules so as to measure the flow.
At present, a flow testing method used in the air tightness test is used for directly detecting the leakage rate of a product, the precision of a wide-range flowmeter is low, and the direct test of the micro leakage of a large-volume workpiece cannot be met. And the high-precision mass flowmeter cannot meet the requirement of quick inflation and deflation in the airtight test of large-volume workpieces due to limited capillary flow, and has low test efficiency.
In view of this, the present application is presented.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a flow type air tightness testing device, aiming at solving the defects in the prior art.
The embodiment of the utility model provides a flow type air tightness testing device, which comprises: the gas tightness detection device comprises a gas input circuit, an exhaust circuit, a gas tightness detection circuit, a first measurement unit and a second measurement unit;
the input end of the gas input loop is used for being connected with a gas pressure source, the output end of the gas input loop is connected with the input end of the gas tightness detection loop, the output end of the gas tightness detection loop is used for being connected with a standard end and a workpiece end, the exhaust loop is connected to the gas tightness detection loop, the first measuring unit is arranged on the gas tightness detection loop, and the second measuring unit is connected between the standard end and the input end of the gas tightness detection loop.
Preferably, the airtightness detection circuit comprises: the first electromagnetic valve and the second electromagnetic valve are connected in sequence;
the input end of the first electromagnetic valve is connected with the output end of the gas input loop, the output end of the second electromagnetic valve is connected with the workpiece end, the first end of the first detection unit is connected with the input end of the first electromagnetic valve, and the second end of the first detection unit is connected with the output end of the second electromagnetic valve.
Preferably, the gas input circuit comprises a solenoid proportional valve and a third solenoid valve;
the input end of the electromagnetic proportional valve is connected with the air pressure source, the output end of the electromagnetic proportional valve is connected with the input end of the third electromagnetic valve, and the output end of the third electromagnetic valve is connected with the input end of the first electromagnetic valve.
Preferably, the exhaust circuit comprises: a first exhaust valve and a second exhaust valve;
the first exhaust valve is connected with the standard end, and the second exhaust valve is connected between the first electromagnetic valve and the second electromagnetic valve.
Preferably, the first measuring unit is a high-precision mass flowmeter.
Preferably, the second measuring unit is a pressure sensor.
Based on the flow type air tightness testing device provided by the utility model, the air input loop is connected with the air pressure source, air with certain pressure is filled into the air tightness detection loop and further filled into the workpiece end and the standard end, the second measuring unit monitors the pressure change in the air path in real time, when the pressure value in the loop reaches a preset value, the air input loop is closed, the electromagnetic valve in the air tightness detection loop is closed, the whole system is placed for a period of time, the flow of leaked air is monitored by the first measuring unit, the signal is processed into a corresponding result, and whether the result is qualified or not is judged by the set leakage standard, so that the problem that in the prior art, the precision of a wide-range flow meter is low, and the direct test of the micro leakage of large-size workpieces cannot be met is solved.
Drawings
FIG. 1 is a schematic circuit diagram of a flow-type air-tightness testing device provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The following detailed description of specific embodiments of the utility model refers to the accompanying drawings.
The utility model discloses a flow type air tightness testing device, aiming at solving the defects in the prior art.
Referring to fig. 1, an embodiment of the present invention provides a flow-type air-tightness testing apparatus, including: the gas tightness detection device comprises a gas input circuit 1, an exhaust circuit, a gas tightness detection circuit 2, a first measurement unit and a second measurement unit;
the input end of the gas input circuit 1 is used for being connected with a gas pressure source P1, the output end of the gas input circuit 1 is connected with the input end of the gas tightness detection circuit 2, the output end of the gas tightness detection circuit 2 is used for being connected with a standard end and a workpiece end, the exhaust circuit is connected on the gas tightness detection circuit 2, the first measuring unit is arranged on the gas tightness detection circuit 2, and the second measuring unit is connected between the standard end and the input end of the gas tightness detection circuit 2.
It should be noted that, in this embodiment, the gas input loop 1 is connected to the gas pressure source P1, a gas with a certain pressure is filled into the gas tightness detection loop 2, and then filled into the workpiece end and the standard end, the second measurement unit monitors the pressure change in the gas path in real time, when the pressure value in the loop reaches a preset value or the gas is filled for a preset time, the gas input loop 1 is closed, the electromagnetic valve in the gas tightness detection loop 2 is closed at the same time, the whole system is placed for a period of time, the first measurement unit monitors the leaked gas flow, and processes the signal into a corresponding result, and the result is determined to be qualified or not according to the set leakage standard, thereby solving the problem that in the prior art, the accuracy of a large-flow meter is low, and the direct test for the micro leakage of large-volume workpieces cannot be satisfied.
In the present embodiment, the gas input circuit 1 includes a solenoid proportional valve P2 and a third solenoid valve V3; the input end of the electromagnetic proportional valve P2 is connected with the air pressure source P1, the output end of the electromagnetic proportional valve P2 is connected with the input end of the third electromagnetic valve V3, and the output end of the third electromagnetic valve V3 is connected with the input end of the first electromagnetic valve V1.
It should be noted that, in this embodiment, the opening and closing of the electromagnetic valve in the controller loop may be controlled by a PLC controller and a touch screen or a key module, specifically, an output end of the PLC controller may be electrically connected to control ends of the electromagnetic proportional valve P2 and the third electromagnetic valve V3, and an apparatus button module may be disposed on the touch screen to control the PLC controller to output an electrical signal to the third electromagnetic valve V3 and the electromagnetic proportional valve P2 to open and close, and after the electromagnetic proportional valve P2 is adjusted to a preset parameter, the air pressure source P1 is controlled to open and the first electromagnetic valve V1 is controlled to open, so as to input air into the airtightness detection loop 2.
In this embodiment, the airtightness detection circuit 2 may include: a first electromagnetic valve V1 and a second electromagnetic valve V2 which are connected in sequence;
the input end of the first electromagnetic valve V1 is connected with the output end of the gas input loop 1, the output end of the second electromagnetic valve V2 is connected with the workpiece end, the first end of the first detection unit is connected with the input end of the first electromagnetic valve V1, and the second end of the first detection unit is connected with the output end of the second electromagnetic valve V2.
It should be noted that the control terminals of the first solenoid valve V1 and the second solenoid valve V2 may be electrically connected to the output terminal of the PLC controller, the opening and closing of the first solenoid valve V1 and the second solenoid valve V2 may be controlled by a touch panel, and when the air pressure source P1 is opened, the PLC controller controls the first solenoid valve V1 and the second solenoid valve V2 to open to inflate the standard terminal and the workpiece terminal.
In this embodiment, the exhaust circuit may include: a first exhaust valve F1 and a second exhaust valve F2;
wherein the first exhaust valve F1 is connected to the standard port and the second exhaust valve F2 is connected between the first solenoid valve V1 and the second solenoid valve V2.
It should be noted that the first exhaust valve F1 is used for exhausting the gas at the standard end to the atmosphere, and the second exhaust valve F2 is used for exhausting the gas at the workpiece end to the atmosphere.
In the present embodiment, the first measurement unit may be a high-precision mass flow meter G1.
It should be noted that, in other embodiments, the first measurement unit may also be another measurement device, which is not specifically limited herein, but these solutions are all within the protection scope of the present invention.
In the present embodiment, the second measurement unit may be a pressure sensor G2.
It should be noted that, in other embodiments, the second measurement unit may also be another measurement device, which is not specifically limited herein, but these solutions are all within the protection scope of the present invention.
The following is the concrete work engineering of the embodiment of the utility model:
the air pressure source P1 charges the regulated air into the air path through an electromagnetic proportional valve P2 with set parameters. At this time, the first electromagnetic valve V1, the second electromagnetic valve V2 and the third electromagnetic valve V3 are opened, and the first exhaust valve F1 and the second exhaust valve F2 are closed; gas with certain pressure is filled into the workpiece end and the standard end from the gas input loop 1; the pressure sensor G2 monitors pressure change in an air path in real time, the first electromagnetic valve V1, the second electromagnetic valve V2 and the third electromagnetic valve V3 are controlled to be closed when set inflation time or set air pressure value is reached, a pressure stabilizing test stage is started, the high-precision mass flowmeter G1, the standard end and the workpiece end form a closed air path to perform air tightness test, the whole system is placed for a period of time according to test requirements, the leakage gas flow is monitored through the high-precision mass flowmeter G1, signals are processed into corresponding results, and whether the results are qualified or not is judged through the set leakage standard. After the test is finished, the first exhaust valve F1 is opened to exhaust the gas in the instrument and the standard end to the atmosphere, the third electromagnetic valve V3 and the second exhaust valve F2 are opened to exhaust the gas in the gas path and the workpiece end to the atmosphere, and the pressure of the loop is recovered to the normal atmospheric pressure.
Based on the flow type airtight testing device provided by the utility model, the gas input loop 1 is connected with the gas pressure source P1, gas with certain pressure is filled into the airtight detection loop 2 and further filled into the workpiece end and the standard end, the second measuring unit monitors the pressure change in the gas circuit in real time, when the pressure value in the loop reaches a preset value, the gas input loop 1 is closed, the electromagnetic valve in the airtight detection loop 2 is closed at the same time, the whole system is placed for a period of time, the leaked gas flow is monitored through the first measuring unit, the signal is processed into a corresponding result, and whether the result is qualified or not is judged through the set leakage standard, so that the problems that in the prior art, the precision of a large-range flow meter is low, and the direct test of the micro leakage of a large-size workpiece cannot be met are solved.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention.
Claims (6)
1. A flow-through hermeticity testing apparatus, comprising: the gas tightness detection device comprises a gas input circuit, an exhaust circuit, a gas tightness detection circuit, a first measurement unit and a second measurement unit;
the input end of the gas input loop is used for being connected with a gas pressure source, the output end of the gas input loop is connected with the input end of the gas tightness detection loop, the output end of the gas tightness detection loop is used for being connected with a standard end and a workpiece end, the exhaust loop is connected to the gas tightness detection loop, the first measuring unit is arranged on the gas tightness detection loop, and the second measuring unit is connected between the standard end and the input end of the gas tightness detection loop.
2. The flow-through airtightness testing apparatus according to claim 1, wherein the airtightness detection circuit comprises: the first electromagnetic valve and the second electromagnetic valve are connected in sequence;
the input end of the first electromagnetic valve is connected with the output end of the gas input loop, the output end of the second electromagnetic valve is connected with the workpiece end, the first end of the first detection unit is connected with the input end of the first electromagnetic valve, and the second end of the first detection unit is connected with the output end of the second electromagnetic valve.
3. A flow-type gas-tight testing device according to claim 2, wherein said gas input circuit comprises a proportional solenoid valve and a third solenoid valve;
the input end of the electromagnetic proportional valve is connected with the air pressure source, the output end of the electromagnetic proportional valve is connected with the input end of the third electromagnetic valve, and the output end of the third electromagnetic valve is connected with the input end of the first electromagnetic valve.
4. A flow-through hermeticity testing device according to claim 1, wherein said exhaust circuit comprises: a first exhaust valve and a second exhaust valve;
the first exhaust valve is connected with the standard end, and the second exhaust valve is connected between the first electromagnetic valve and the second electromagnetic valve.
5. A flow-type gas tightness testing device according to claim 1, wherein the first measuring unit is a high precision mass flow meter.
6. A flow-type tightness testing device according to claim 1, wherein the second measuring unit is a pressure sensor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110907090.2A CN113432809A (en) | 2021-08-09 | 2021-08-09 | Flow type air tightness testing device |
| CN2021109070902 | 2021-08-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215811476U true CN215811476U (en) | 2022-02-11 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110907090.2A Withdrawn CN113432809A (en) | 2021-08-09 | 2021-08-09 | Flow type air tightness testing device |
| CN202122574596.4U Expired - Fee Related CN215811476U (en) | 2021-08-09 | 2021-10-25 | Flow type air tightness testing device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110907090.2A Withdrawn CN113432809A (en) | 2021-08-09 | 2021-08-09 | Flow type air tightness testing device |
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| CN (2) | CN113432809A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018504A (en) * | 2021-11-03 | 2022-02-08 | 厦门理工学院 | Air tightness testing device and method |
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2021
- 2021-08-09 CN CN202110907090.2A patent/CN113432809A/en not_active Withdrawn
- 2021-10-25 CN CN202122574596.4U patent/CN215811476U/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN113432809A (en) | 2021-09-24 |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220211 |