CN213658193U - Positive and negative pressure type precise air tightness detector - Google Patents

Positive and negative pressure type precise air tightness detector Download PDF

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Publication number
CN213658193U
CN213658193U CN202022703476.5U CN202022703476U CN213658193U CN 213658193 U CN213658193 U CN 213658193U CN 202022703476 U CN202022703476 U CN 202022703476U CN 213658193 U CN213658193 U CN 213658193U
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air
valve
gas
negative pressure
positive
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李品鹏
杨明
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Chongqing Vector And Machinery Manufacturing Co ltd
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Chongqing Vector And Machinery Manufacturing Co ltd
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Abstract

The utility model discloses a positive negative die mould precision gas tightness detector, including control system, gas tightness detecting element, the unit of admitting air includes air supply, gas holder, trigeminy piece, vacuum generator and solenoid valve subassembly, solenoid valve subassembly includes positive negative pressure switching valve, first malleation governing valve, negative pressure regulating valve, the air supply is connected with the gas holder gas circuit, the gas holder is connected with trigeminy piece gas circuit, trigeminy piece is connected with positive negative pressure switching valve gas circuit, positive negative pressure switching valve is connected with vacuum generator and first malleation governing valve gas circuit respectively, vacuum generator is connected with the negative pressure regulating valve gas circuit, negative pressure regulating valve and first malleation governing valve are connected with gas tightness detecting element gas circuit respectively. Airtightness detector simple structure, airtightness under the realization positive negative pressure mode that can be quick accurate detects, and the test demand that satisfies that can be fine both needed positive pressure airtightness test and need negative pressure airtightness test occasion.

Description

Positive and negative pressure type precise air tightness detector
Technical Field
The utility model relates to a work piece gas tightness detects technical field, concretely relates to accurate gas tightness detector of positive negative die mould.
Background
The air tightness is taken as a main quality performance parameter of a sealing product, and is more and more emphasized by sealing product manufacturers, for products which strictly require the sealing performance, if leakage occurs in the using process and the leakage amount exceeds the allowable range, the reliability, the economy and the like of the products are directly influenced, serious consequences such as fire, explosion, harmful gas overflow and the like can be caused, and irreparable loss is caused. Therefore, how to detect the leakage amount quickly and accurately becomes a problem to be solved urgently by enterprises.
Disclosure of Invention
In view of this, the utility model aims at providing a can detect the gas tightness detector of gas tightness fast accurate high accuracy.
In order to realize the purpose, the utility model discloses a positive and negative pressure type precise air tightness detector, which comprises a control system, an air tightness detection unit and an air inlet unit, wherein the air tightness detection unit is used for detecting the air tightness condition of a detected piece, the air inlet unit is used for providing positive and negative pressure support required by detection for the air tightness detection unit, the air inlet unit comprises an air source, an air storage tank, a triple piece, a vacuum generator and an electromagnetic valve component, the electromagnetic valve component comprises a positive and negative pressure switching valve, a first positive pressure regulating valve and a negative pressure regulating valve, the air source is connected with an air inlet end air passage of the air storage tank, an air outlet end of the air storage tank is connected with an air inlet end air passage of the triple piece, an air outlet end of the triple piece is connected with an air inlet end air passage of the positive and negative pressure switching valve, a first air outlet end of the positive and negative, the air outlet end of the vacuum generator is connected with the air inlet end of the negative pressure regulating valve through an air circuit; the second air outlet end of the positive and negative pressure switching valve is connected with the air inlet end of the first positive pressure regulating valve through an air circuit, the air outlet end of the negative pressure regulating valve and the air outlet end of the first positive pressure regulating valve are respectively connected with the air source inlet air circuit of the air tightness detecting unit, and the control system is used for controlling the air inlet unit and the air tightness detecting unit to work. The air inlet unit is provided with the positive pressure air circuit and the negative pressure air circuit simultaneously, so that the switching between the positive pressure air circuit and the negative pressure air circuit can be realized quickly, and the test requirements of occasions needing both positive pressure air tightness test and negative pressure air tightness test can be better met.
Further, a one-way valve is further arranged between the air source and the air storage tank, an air inlet end of the one-way valve is connected with an air path of the air source, and an air outlet end of the one-way valve is connected with an air path of an air inlet end of the air storage tank. The check valve is arranged between the air source and the air storage tank, so that certain pressure can be maintained in the air storage tank during normal work, and the air in the air storage tank can be prevented from flowing backwards under the condition that the air source is interrupted.
Further, the air tightness detection unit comprises an air source inlet, a system air inlet pipeline and a collection unit; the air source inlet comprises a positive pressure air source inlet, a negative pressure air source inlet and a control air source inlet; the positive pressure gas source inlet is connected with a gas outlet end gas circuit of a first positive pressure regulating valve of the gas inlet unit, the negative pressure gas source inlet is connected with a gas outlet end gas circuit of a negative pressure regulating valve of the gas inlet unit, and the control gas source inlet is connected with a gas outlet end gas circuit of a triple piece of the gas inlet unit; the system air inlet pipeline comprises a test gas pipeline and a control gas pipeline; the test gas pipeline comprises an electric three-way valve, a first pneumatic three-way valve, a second pneumatic three-way valve and a standard cavity; the first end of the electric three-way valve is connected with a positive pressure gas source inlet gas circuit, and the second end of the electric three-way valve is connected with a negative pressure gas source inlet gas circuit; the first end of the first pneumatic three-way valve is connected with the third end of the electric three-way valve through a gas circuit, the second end of the first pneumatic three-way valve is connected with a gas circuit of a tested piece, and the third end of the first pneumatic three-way valve is connected with a gas circuit of the standard cavity; the first end of the second pneumatic three-way valve is connected with the standard cavity and the third end of the first pneumatic three-way valve through a gas circuit, and the second end of the second pneumatic three-way valve is connected with the second end of the first pneumatic three-way valve through a gas circuit and a tested piece; the control gas pipeline comprises a second positive pressure regulating valve, a first electromagnetic valve and a second electromagnetic valve; the air inlet end of the second positive pressure regulating valve is connected with the air channel of the control air source inlet; the first end of the first electromagnetic valve is connected with the gas path of the gas outlet end of the second positive pressure regulating valve, and the second end of the first electromagnetic valve is connected with the gas path of the control gas inlet of the first pneumatic three-way valve of the test gas pipeline; the first end of the second electromagnetic valve is connected with the gas outlet end of the second positive pressure regulating valve and the first end of the first electromagnetic valve through a gas circuit, and the second end of the second electromagnetic valve is connected with the control gas inlet of the second pneumatic three-way valve through a gas circuit; the acquisition unit comprises a differential pressure sensor and a pressure sensor, wherein a first end of the differential pressure sensor is connected with a second end of a first pneumatic three-way valve in the test gas pipeline and a gas path of a tested piece, and a second end of the differential pressure sensor is connected with a third end of the first pneumatic three-way valve in the test gas pipeline and a gas path of a standard cavity; the pressure sensor is positioned in an air path between the second end of the first pneumatic three-way valve and the measured piece. The gas tightness detecting unit is arranged in such a way, so that the gas tightness can be quickly and accurately detected.
Further, the air tightness detection unit is also provided with an air discharge silencer, and the air discharge silencer is arranged at the third end of the second pneumatic three-way valve of the test gas pipeline.
Furthermore, a first manual valve is arranged in a gas path between the measured part and the first pneumatic three-way valve, and a second manual valve is arranged in a gas path between the standard cavity and the first pneumatic three-way valve; the first end of the first manual valve is connected with the second end of the first pneumatic three-way valve and the first end of the differential pressure sensor through a gas circuit, and the second end of the first manual valve is connected with the gas circuit of the tested part; and the first end of the second manual valve is connected with the third end of the first pneumatic three-way valve and the second end of the differential pressure sensor through a gas circuit, and the second end of the second manual valve is connected with a standard cavity gas circuit.
Further, the air tightness detection unit is also provided with a safety valve, and the safety valve is positioned in an air path between the third end of the electric three-way valve and the first end of the first pneumatic three-way valve. The safety valve is arranged on the air tightness detection unit, so that the detection unit can be prevented from being damaged due to the fact that overpressure gas enters the air tightness detection unit.
Further, control system is PLC control system, including PLC and AD converter, differential pressure sensor and pressure sensor are respectively through AD converter and PLC electric connection, positive negative pressure switching valve, first positive pressure governing valve, negative pressure governing valve, second positive pressure governing valve, electronic three-way valve, first solenoid valve, second solenoid valve and PLC electric connection. The control system selects the PLC control system, has high reliability and strong anti-interference capability, and can realize air tightness detection control more accurately.
The utility model has the advantages that: accurate gas tightness detector of positive negative die mould simple structure, the gas tightness under the realization positive negative pressure mode that can be quick accurate detects, and the fine satisfaction of ability both needs the test demand of positive pressure gas tightness test and need negative pressure gas tightness test occasion again.
Drawings
FIG. 1 is a schematic view of an air intake unit;
FIG. 2 is a schematic view of a gas tightness detecting unit;
FIG. 3 is a block diagram of a control system architecture;
description of the figure numbering: 1 is the air supply, 2 is the gas tightness detecting element, 3 is the check valve, 4 is the gas holder, 5 are the trigeminy piece, 6 are positive negative pressure switching valve, 7 are vacuum generator, 8 are negative pressure regulating valve, 9 are first positive pressure regulating valve, 21 are second positive pressure regulating valve, 22 gassing silencers, 23 are standard chamber, 24 are the relief valve.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. Modifications and substitutions of methods, steps or conditions of the present invention by those skilled in the art without departing from the spirit and substance of the present invention are intended to be included within the scope of the present invention.
As shown in fig. 1, a positive and negative pressure type precise air tightness detector comprises a control system, an air tightness detection unit 2 and an air inlet unit, wherein the air tightness detection unit 2 is used for detecting the air tightness of a detected piece, the air inlet unit is used for providing positive and negative pressure support required by detection for the air tightness detection unit 2, the air inlet unit comprises an air source 1, an air storage tank 4, a triple piece 5, a vacuum generator 7 and an electromagnetic valve assembly, the electromagnetic valve assembly comprises a positive and negative pressure switching valve 6, a first positive pressure regulating valve 9 and a negative pressure regulating valve 8, the air source 1 is connected with an air inlet end of the air storage tank 4, an air outlet end of the air storage tank 4 is connected with an air inlet end of the triple piece 5, an air outlet end of the triple piece 5 is connected with an air inlet end of the positive and negative pressure switching valve 6, a first air outlet end of the positive and negative pressure switching valve 6 is connected with an air inlet, the air outlet end of the vacuum generator 7 is connected with the air inlet end of the negative pressure regulating valve 8 through an air circuit; the second air outlet end of the positive and negative pressure switching valve 6 is connected with the air inlet end of the first positive pressure regulating valve 9 through an air circuit, the air outlet end of the negative pressure regulating valve 8 and the air outlet end of the first positive pressure regulating valve 9 are respectively connected with the air source inlet air circuit of the air tightness detecting unit 2, and the control system is used for controlling the air inlet unit and the air tightness detecting unit to work.
In order to prevent the gas in the gas storage tank 4 from flowing backwards when the gas source 1 is interrupted, in one embodiment, a one-way valve 3 is further arranged between the gas source 1 and the gas storage tank 4, the gas inlet end of the one-way valve 3 is connected with the gas source 1, and the gas outlet end of the one-way valve 3 is connected with the gas inlet end of the gas storage tank 4.
In one embodiment, as shown in fig. 2, the air tightness detecting unit 2 comprises an air source inlet, a system air inlet pipeline and a collecting unit; the air source inlet comprises a positive pressure air source inlet, a negative pressure air source inlet and a control air source inlet; the positive pressure gas source inlet is connected with the gas outlet end gas circuit of the first positive pressure regulating valve 9 of the gas inlet unit, the negative pressure gas source inlet is connected with the gas outlet end gas circuit of the negative pressure regulating valve 8 of the gas inlet unit, and the control gas source inlet is connected with the gas outlet end gas circuit of the triple piece 5 of the gas inlet unit; the system air inlet pipeline comprises a test gas pipeline and a control gas pipeline; the test gas pipeline comprises an electric three-way valve V, a first pneumatic three-way valve V1, a second pneumatic three-way valve V2 and a standard cavity 23; the first end of the electric three-way valve V is connected with a positive pressure gas source inlet gas circuit, and the second end of the electric three-way valve V is connected with a negative pressure gas source inlet gas circuit; the first end of the first pneumatic three-way valve V2 is in gas circuit connection with the third end of the electric three-way valve V, the second end is in gas circuit connection with a measured piece, and the third end is in gas circuit connection with the standard cavity 23; a first end of the second pneumatic three-way valve V2 is in gas circuit connection with the standard cavity 23 and a third end of the first pneumatic three-way valve V, and a second end of the second pneumatic three-way valve V1 is in gas circuit connection with a tested piece; the control gas pipeline comprises a second positive pressure regulating valve 21, a first electromagnetic valve V3 and a second electromagnetic valve V4; the air inlet end of the second positive pressure regulating valve 21 is connected with the air path of the inlet of the control air source; the first end of the first electromagnetic valve V3 is in gas circuit connection with the gas outlet end of the second positive pressure regulating valve 21, and the second end of the first electromagnetic valve V3 is in gas circuit connection with the control gas inlet of the first pneumatic three-way valve V1 of the test gas pipeline; the first end of the second electromagnetic valve V4 is in gas path connection with the gas outlet end of the second positive pressure regulating valve 21 and the first end of the first electromagnetic valve V3, and the second end is in gas path connection with the control gas inlet of the second pneumatic three-way valve V2; the collecting unit comprises a differential pressure sensor DPS and a pressure sensor PS, wherein a first end of the differential pressure sensor DPS is connected with a second end of a first pneumatic three-way valve V1 in the test gas pipeline and a gas circuit of a tested piece, and a second end of the differential pressure sensor DPS is connected with a third end of a first pneumatic three-way valve V1 in the test gas pipeline and a gas circuit of the standard cavity 23; the pressure sensor PS is positioned in an air path between the second end of the first pneumatic three-way valve V1 and the piece to be detected; a first manual valve V5 is arranged in a gas path between the tested piece and the first pneumatic three-way valve V1, and a second manual valve V6 is arranged in a gas path between the standard cavity 23 and the first pneumatic three-way valve V1; the first end of the first manual valve V5 is in gas circuit connection with the second end of the first pneumatic three-way valve V1 and the first end of a differential pressure sensor DPS, and the second end is in gas circuit connection with a tested piece; and a first end of the second manual valve V6 is connected with a third end of the first pneumatic three-way valve V1 and a second end of the differential pressure sensor DPS through an air passage, and a second end of the second manual valve V6 is connected with the standard cavity 23 through an air passage.
In order to reduce the noise during the air bleeding after the test is finished, in one embodiment, the air tightness detecting unit 2 is further provided with an air bleeding silencer 22, and the air bleeding silencer 22 is arranged at the third end of the second pneumatic three-way valve V2 of the test gas pipeline.
In order to prevent overpressure gas from entering the gas tightness detecting unit 2 to damage the gas tightness detecting unit 2, in one embodiment, the gas tightness detecting unit 2 is further provided with a safety valve 24, and the safety valve 24 is located in a gas path between the third end of the electric three-way valve V and the first end of the first pneumatic three-way valve V1.
The control system can be any that exist on the existing market and can realize the utility model discloses automatic control's control system, as shown in fig. 3, in an embodiment, control system is PLC control system, including PLC and AD converter, differential pressure sensor DPS and pressure sensor PS are respectively through AD converter and PLC electric connection, positive negative pressure switching valve 6, first positive pressure regulating valve 9, negative pressure regulating valve 8, second positive pressure regulating valve 21, electric three-way valve V, first solenoid valve V3, second solenoid valve V4 respectively with PLC electric connection.
The utility model discloses a detection principle does: in the positive pressure test mode, the test gas passes through the positive and negative pressure switching valve 6 to the first positive pressure regulating valve 9, is regulated to the test pressure by the first positive pressure regulating valve 9, and then enters the air tightness detection unit to provide positive pressure support; the control gas is adjusted to the preset pressure by the second positive pressure adjusting valve 21, the first electromagnetic valve V3 is electrified and opened, the control gas source with the preset pressure enters the first pneumatic three-way valve V1 to control the first pneumatic three-way valve V1 to be opened to inflate the standard cavity 23 and the tested piece, after the inflation is finished, the first battery valve V3 is powered off, the control air source which is adjusted to the preset pressure is disconnected to control the first pneumatic three-way valve V1 to be closed, after the balance time, the pressure sensor PS detects the pressure change, for judging a large leak (a large leak is considered to occur if the gas pressure in the test piece container rapidly drops within a set time), detecting the pressure difference between the standard chamber and the two ends of the test piece by the differential pressure sensor DPS, and calculating the leakage rate through a circuit according to the pressure difference, electrifying the second electromagnetic valve V4 after the detection is finished, and controlling the air source with the pressure regulated to the preset pressure to enter the second pneumatic three-way valve V2 to control the second pneumatic three-way valve V2 to open and deflate. In the negative pressure test mode, the test gas passes through the positive and negative pressure switching valve 6 to the vacuum generator 7 to generate vacuum, is adjusted to the test vacuum by the negative pressure adjusting valve 8, then enters the air tightness detection unit to provide negative pressure support, and the air tightness detection unit performs negative pressure air tightness test according to the control method of the positive pressure test mode.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and all modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (7)

1. A positive and negative pressure type precise air tightness detector is characterized by comprising a control system, an air tightness detection unit and an air inlet unit, the air tightness detection unit is used for detecting the air tightness of the detected piece, the air inlet unit is used for providing positive and negative pressure support required by detection for the air tightness detection unit, the air inlet unit comprises an air source, an air storage tank, a triple piece, a vacuum generator and a solenoid valve component, the electromagnetic valve component comprises a positive and negative pressure switching valve, a first positive pressure regulating valve and a negative pressure regulating valve, the air source is connected with an air inlet end air passage of the air storage tank, the air outlet end of the air storage tank is connected with the air inlet end of the triple piece, the air outlet end of the triple piece is connected with the air inlet end of the positive and negative pressure switching valve, the first air outlet end of the positive and negative pressure switching valve is connected with an air inlet end of a vacuum generator, and the air outlet end of the vacuum generator is connected with an air inlet end of a negative pressure regulating valve; the second air outlet end of the positive and negative pressure switching valve is connected with the air inlet end of the first positive pressure regulating valve through an air circuit, the air outlet end of the negative pressure regulating valve and the air outlet end of the first positive pressure regulating valve are respectively connected with the air source inlet air circuit of the air tightness detecting unit, and the control system is used for controlling the air inlet unit and the air tightness detecting unit to work.
2. The positive-negative pressure type precise air tightness detector according to claim 1, wherein a one-way valve is further arranged between the air source and the air storage tank, an air inlet end of the one-way valve is connected with an air path of the air source, and an air outlet end of the one-way valve is connected with an air path of an air inlet end of the air storage tank.
3. The positive and negative pressure type precise air tightness detector according to claim 1, wherein the air tightness detecting unit comprises an air source inlet, a system air inlet pipeline and a collecting unit; the air source inlet comprises a positive pressure air source inlet, a negative pressure air source inlet and a control air source inlet; the positive pressure gas source inlet is connected with a gas outlet end gas circuit of a first positive pressure regulating valve of the gas inlet unit, the negative pressure gas source inlet is connected with a gas outlet end gas circuit of a negative pressure regulating valve of the gas inlet unit, and the control gas source inlet is connected with a gas outlet end gas circuit of a triple piece of the gas inlet unit; the system air inlet pipeline comprises a test gas pipeline and a control gas pipeline; the test gas pipeline comprises an electric three-way valve, a first pneumatic three-way valve, a second pneumatic three-way valve and a standard cavity; the first end of the electric three-way valve is connected with a positive pressure gas source inlet gas circuit, and the second end of the electric three-way valve is connected with a negative pressure gas source inlet gas circuit; the first end of the first pneumatic three-way valve is connected with the third end of the electric three-way valve through a gas circuit, the second end of the first pneumatic three-way valve is connected with a gas circuit of a tested piece, and the third end of the first pneumatic three-way valve is connected with a gas circuit of the standard cavity; the first end of the second pneumatic three-way valve is connected with the standard cavity and the third end of the first pneumatic three-way valve through a gas circuit, and the second end of the second pneumatic three-way valve is connected with the second end of the first pneumatic three-way valve through a gas circuit and a tested piece; the control gas pipeline comprises a second positive pressure regulating valve, a first electromagnetic valve and a second electromagnetic valve; the air inlet end of the second positive pressure regulating valve is connected with the air channel of the control air source inlet; the first end of the first electromagnetic valve is connected with the gas path of the gas outlet end of the second positive pressure regulating valve, and the second end of the first electromagnetic valve is connected with the gas path of the control gas inlet of the first pneumatic three-way valve of the test gas pipeline; the first end of the second electromagnetic valve is connected with the gas outlet end of the second positive pressure regulating valve and the first end of the first electromagnetic valve through a gas circuit, and the second end of the second electromagnetic valve is connected with the control gas inlet of the second pneumatic three-way valve through a gas circuit; the acquisition unit comprises a differential pressure sensor and a pressure sensor, wherein a first end of the differential pressure sensor is connected with a second end of a first pneumatic three-way valve in the test gas pipeline and a gas path of a tested piece, and a second end of the differential pressure sensor is connected with a third end of the first pneumatic three-way valve in the test gas pipeline and a gas path of a standard cavity; the pressure sensor is positioned in an air path between the second end of the first pneumatic three-way valve and the measured piece.
4. The positive and negative pressure type precise air tightness detector according to claim 3, wherein the air tightness detecting unit is further provided with an air bleeding silencer, and the air bleeding silencer is arranged at a third end of the second pneumatic three-way valve of the test gas pipeline.
5. The positive-negative pressure type precise air tightness detector according to claim 3, wherein a first manual valve is arranged in an air path between the detected piece and the first pneumatic three-way valve, and a second manual valve is arranged in an air path between the standard cavity and the first pneumatic three-way valve; the first end of the first manual valve is connected with the second end of the first pneumatic three-way valve and the first end of the differential pressure sensor through a gas circuit, and the second end of the first manual valve is connected with the gas circuit of the tested part; and the first end of the second manual valve is connected with the third end of the first pneumatic three-way valve and the second end of the differential pressure sensor through a gas circuit, and the second end of the second manual valve is connected with a standard cavity gas circuit.
6. The positive-negative pressure type precise air-tightness detector according to claim 3, wherein the air-tightness detecting unit is further provided with a safety valve, and the safety valve is positioned in an air path between the third end of the electric three-way valve and the first end of the first pneumatic three-way valve.
7. The positive-negative pressure type precise air tightness detector according to claim 3, wherein the control system is a PLC control system and comprises a PLC and an AD converter, the differential pressure sensor and the pressure sensor are electrically connected with the PLC through the AD converter, and the positive-negative pressure switching valve, the first positive pressure regulating valve, the negative pressure regulating valve, the second positive pressure regulating valve, the electric three-way valve, the first electromagnetic valve and the second electromagnetic valve are electrically connected with the PLC.
CN202022703476.5U 2020-11-20 2020-11-20 Positive and negative pressure type precise air tightness detector Active CN213658193U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022703476.5U CN213658193U (en) 2020-11-20 2020-11-20 Positive and negative pressure type precise air tightness detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022703476.5U CN213658193U (en) 2020-11-20 2020-11-20 Positive and negative pressure type precise air tightness detector

Publications (1)

Publication Number Publication Date
CN213658193U true CN213658193U (en) 2021-07-09

Family

ID=76685035

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202022703476.5U Active CN213658193U (en) 2020-11-20 2020-11-20 Positive and negative pressure type precise air tightness detector

Country Status (1)

Country Link
CN (1) CN213658193U (en)

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