CN205280304U - Airtight leakage detector of differential pressure formula with PWM control solenoid - Google Patents
Airtight leakage detector of differential pressure formula with PWM control solenoid Download PDFInfo
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- CN205280304U CN205280304U CN201521013229.5U CN201521013229U CN205280304U CN 205280304 U CN205280304 U CN 205280304U CN 201521013229 U CN201521013229 U CN 201521013229U CN 205280304 U CN205280304 U CN 205280304U
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Abstract
The utility model provides an airtight leakage detector of differential pressure formula with PWM control solenoid, it includes the control unit, air source interface, inflation valve, balanced valve, primary standard substance interface and measured object interface, air source interface is with the inflation valve intercommunication and met a pressure sensor between the two, the punishment of the output port of inflation valve do not with primary standard substance interface, measured object interface, discharge valve and the 2nd pressure sensor and connects, and primary standard substance interface and measured object interface all are connected with the inflation valve through the air flue that is equipped with the balanced valve, the control unit includes the PWM controller, and the PWM controller is connected with inflation valve, balanced valve and discharge valve electricity respectively. The utility model discloses use the PWM controller to control the solenoid valve of using in the airtight leakage detector and can effectively avoid the big problem of large -traffic solenoid valve calorific capacity.
Description
Technical field
The utility model belongs to airtight detection field, especially relates to the airtight leak locator of differential pressure type of a kind of PWM Controlling solenoid valve.
Background technology
The current control valve in airtight leak locator, normal employing the following two kinds technical scheme:
Micro-flow solenoid valve adds Pneumatic valve: with the miniflow amount solenoid valve conduction of small power or block drive pressure, by drive pressure-controlled Pneumatic valve, it is achieved leak locator gas circuit control. The shortcoming using this mode to carry out airtight detection is: device cost height, it is necessary to uses a magnetic valve and a Pneumatic valve respectively, could manipulate a gas circuit node, add the cost of leak locator; Using and maintenance cost height, user needs additionally to provide driving to calm the anger source simultaneously, will connect two gas sources (driving pressure and test pressure) and could drive leak locator, and then add use and the maintenance cost of user.
Large discharge magnetic valve: directly use the magnetic valve of large discharge to realize the gas circuit control of leak locator. The shortcoming using this mode to carry out airtight detection is: accuracy of detection is low, owing to the magnetic valve power consumption of large discharge is higher, thermal value is big, and pressure and sensor detection to gas in gas circuit all can produce detrimentally affect, and therefore the accuracy of detection of leak locator can be obviously poor; Simultaneously noise is big, failure rate height, and owing to the magnetic valve power consumption of large discharge is higher, thermal value is big, and leak locator must use the mode of active heat removal to come for inner air path cooling, and this just needs to increase fan, and will produce noise in operational process.
And industry spot circumstance complication, the very easily long-pending dirt of the fan of leak locator inside, causes fault, and fan fault can cause again overheat of solenoid valve, produces more serious fault, even burns the circuit of leak locator.
Summary of the invention
In view of this, the utility model is intended to propose the airtight leak locator of differential pressure type and the leak hunting method thereof of a kind of PWM Controlling solenoid valve, and to solve, magnetic valve thermal value is big, power consumption height and the low problem of precision of detecting leak gas.
For achieving the above object, the technical solution of the utility model is achieved in that
The airtight leak locator of the differential pressure type of PWM Controlling solenoid valve, it comprises control unit, gas source interface, inflation valve, equilibrium valve, standard substance interface and analyte interface;
Described gas source interface is connected with inflation valve and is connected to the first pressure transmitter between the two;
The output port place of described inflation valve respectively with standard substance interface, analyte interface, vent valve and the 2nd pressure transmitter and connect, and standard substance interface and analyte interface are all connected with inflation valve by being provided with the air flue of equilibrium valve;
The input terminus of described vent valve is connected with inflation valve, and its output terminal is provided with venting port;
It is provided with differential pressure pick-up between described standard substance interface and analyte interface;
Described control unit comprises PWM controller, and described PWM controller is electrically connected with inflation valve, equilibrium valve and vent valve respectively.
Further, described control unit also comprises input unit and display equipment, and described input unit is connected with PWM controller signal, and described PWM controller is connected with described display equipment signal.
Further, described inflation valve and equilibrium valve are 2/2-way normally closed solenoid valve.
Further, described vent valve is 2/2-way normally open solenoid valve.
Relative to prior art, the airtight leak locator of differential pressure type of a kind of PWM Controlling solenoid valve described in the utility model has following advantage:
The magnetic valve that the utility model uses PWM controller to control in airtight leak locator to use can effectively prevent the big problem of large discharge magnetic valve thermal value;
Simultaneously, owing to needing bigger electric current during magnetic valve action, pilot circuit will provide the high level of certain time when magnetic valve action, after magnetic valve action, export PWM again, the action state of magnetic valve is maintained, so effectively prevent the problem that large discharge magnetic valve thermal value is big with less electric current;
Due to different magnetic valves, the electric current needed during action is different, the electric current maintaining magnetic valve state needs is also different, therefore, this scheme adopts the mode of PWM controller Controlling solenoid valve, the dutycycle of PWM all can be set by control unit to the high level time of solenoid valve control circuit and when maintaining magnetic valve, and the parameter after setting can be saved in storer. When leak locator works, control unit will transfer solenoid control parameter automatically from storer, can be driven by magnetic valve, so improving detection efficiency and the precision of whole leak locator.
Accompanying drawing explanation
The accompanying drawing forming a part of the present utility model is used to provide of the present utility model it is further understood that schematic description and description of the present utility model is for explaining the utility model, does not form improper restriction of the present utility model. In the accompanying drawings:
Fig. 1 is the components and parts connection diagram of the airtight leak locator of differential pressure type of a kind of PWM Controlling solenoid valve described in the utility model embodiment;
Fig. 2 is the leak hunting method schema of the airtight leak locator of differential pressure type of a kind of PWM Controlling solenoid valve described in the utility model embodiment;
Fig. 3 is the control method flow diagram of the PWM controller Controlling solenoid valve described in the utility model embodiment.
Solid line in Fig. 1 represents gas circuit, and dotted line represents circuit.
Description of reference numerals:
1-gas source; 2-inflation valve; 3-equilibrium valve; 4-vent valve; 5-differential pressure pick-up; 6-first pressure transmitter; 7-the 2nd pressure transmitter; 8-analyte; 9-standard substance; 10-venting port; 11-PWM controller; 12-input unit; 13-storing device; 14-display equipment.
Embodiment
It should be noted that, when not conflicting, the embodiment in the utility model and the feature in embodiment can combine mutually.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", it is based on orientation shown in the drawings or position relation that the orientation of the instruction such as " outward " or position are closed, it is only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device referred to or element must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as restriction of the present utility model. in addition, term " first ", " the 2nd " etc. are only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technology feature. thus, the feature being limited with " first ", " the 2nd " etc. can be expressed or implicit comprise one or more these features. in description of the present utility model, unless otherwise explanation, the implication of " multiple " is two or more.
In description of the present utility model, it is necessary to explanation, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, it is possible to be fixedly connected with, it is also possible to be removably connect, or connect integratedly; Can be mechanically connected, it is also possible to be electrical connection; Can be directly be connected, it is also possible to be indirectly connected by intermediary, it is possible to be the connection of two element internals. For the ordinary skill in the art, it is possible to understand the concrete implication of above-mentioned term in the utility model by particular case.
Below with reference to the accompanying drawings and come the utility model is described in detail in conjunction with the embodiments.
As shown in Figure 1:
1, testing the source of calming the anger is air gas source;
2, inflation valve: 2/2-way normally closed solenoid valve, opens in aeration phase, is inflated in advance by analyte, closes after having inflated;
3, equilibrium valve: 2/2-way normally closed solenoid valve, cuts out before completing to detection after inflation completes, and all the other moment all open;
4, vent valve: 2/2-way normally open solenoid valve, closes in testing process (from inflation, until detection terminates), opens after having detected;
5, differential pressure pick-up: the pressure difference being used between detection analyte and standard substance in differential pressure measuring link;
6, the first pressure transmitter: be used for detecting test pressure;
7, the 2nd pressure transmitter: the operating pressure being used for detecting leak locator in the middle of testing process;
12, input unit: be used for inputting to PWM controller, comprises input detection instruction, input amendment parameter instruction, setting solenoid control parameter etc.;
13, storing device: be used for storing the data such as detected result and magnetic valve parameter;
14, display equipment: drive by PWM controller, for carrying out man-machine interaction with user.
The airtight leak locator of the differential pressure type of PWM Controlling solenoid valve, it comprises control unit, gas source interface, inflation valve 2, equilibrium valve 3, standard substance interface and analyte interface;
Described gas source interface is connected with inflation valve 2 and is connected to the first pressure transmitter 6 between the two;
The output port place of described inflation valve 2 respectively with standard substance interface, analyte interface, vent valve 4 and the 2nd pressure transmitter 7 and connect, and standard substance interface and analyte interface are all connected with inflation valve 2 by being provided with the air flue of equilibrium valve 3;
The input terminus of described vent valve 4 is connected with inflation valve 2, and its output terminal is provided with venting port 10;
It is provided with differential pressure pick-up 5 between described standard substance interface and analyte interface;
Described control unit comprises PWM controller 11, input unit 12 and display equipment 14, described PWM controller 11 is electrically connected with inflation valve 2, equilibrium valve 3 and vent valve 4 respectively, described input unit 12 is connected with PWM controller 11 signal, and described PWM controller 11 is connected with described display equipment 14 signal.
Above-mentioned inflation valve 2 and equilibrium valve 3 are 2/2-way normally closed solenoid valve, and described vent valve 4 is 2/2-way normally open solenoid valve.
This leak locator, by input unit 12, storing device 13 and control unit, is set the driving parameter of inflation valve 2, equilibrium valve 3 and vent valve 4 respectively by user, wherein drives parameter to comprise:
A opening time: when driving magnetic valve action, high level needs the time maintained.
B dutycycle: when maintaining magnetic valve action, the dutycycle of PWM waveform.
As shown in Figures 2 and 3, it may also be useful to the leak hunting method of the airtight leak locator of differential pressure type of a kind of PWM Controlling solenoid valve according to claim 1, its concrete steps:
Step one, in the standby state, control unit can keep all valves to be in default state.
Step 2, when testing process starts, first PWM controller 11 will open inflation valve 2 and equilibrium valve 3, close vent valve 4, analyte 8 and standard substance 7 are inflated, so that before testing, analyte 8 and standard substance 7 internal pressure is made to reach test pressure in advance, after default inflationtime, PWM controller 11 will close inflation valve 2, and then stop inflation.
Step 3, PWM controller 11 makes inflation valve 2 close, within default starting time, 2nd pressure transmitter 7 is monitored, whether the test pressure judged in analyte 8 meets the requirements, undesirable, jumps directly to step 5, meets the requirements, continues next step.
Step 4, PWM controller 11 will close equilibrium valve 3 within the default time, path between standard substance 7 and analyte 8 is cut off, PWM controller 11 is by the signal intensity of monitoring differential pressure pick-up 5 simultaneously, after terminating default detection time, judge the differential pressure measuring spillage of analyte 8.
Step 5, vent valve 4 and equilibrium valve 3 are opened (keeping inflation valve 2 to close) by PWM controller 11, high pressure gas remaining in analyte 8 and standard substance 7 are discharged by vent valve 4, shows detected result simultaneously on display equipment 14.
Step 6, after the default exhaust time terminates, PWM controller 11 closes equilibrium valve 3, and now whole system recovery is to standby state.
The controller mode being the inflation valve 2 of magnetic valve, vent valve 4 and equilibrium valve 3 is by above-mentioned PWM controller 11:
As shown in Figure 3, magnetic valve is exported high level within the time of this PWM controller 11 inner setting and orders about corresponding magnetic valve and open by described PWM controller 11, after getting through, PWM controller 11 continues to export PWM waveform driving magnetic valve, and magnetic valve is exported lower level and orders about corresponding closed electromagnetic valve by PWM controller 11.
This this leak locator and use the useful effect that the leak hunting method of this leak locator realizes:
Device cost is low: only use large discharge magnetic valve, it is not necessary to Pneumatic valve, does not also need to use active heat removal device, reduces device fabrication cost.
Use with maintenance cost low: user only needs supporting single gas source to use, it is not necessary to increases a set of driving gas source and equipment, reduces use and the maintenance cost of user.
Accuracy of detection height: owing to avoiding the problem of large discharge magnetic valve heating, therefore the precision of equipment can do more.
Noise is little, failure rate is low: without the need to increasing active heat removal device, can not produce extra noise when leak locator works. Magnetic valve can not be overheated, also greatly reduces the probability broken down.
The foregoing is only better embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment of doing, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (4)
1. the airtight leak locator of the differential pressure type with PWM Controlling solenoid valve, it is characterised in that: comprise control unit, gas source interface, inflation valve (2), equilibrium valve (3), standard substance interface and analyte interface;
Described gas source interface is connected with inflation valve (2) and is connected to the first pressure transmitter (6) between the two;
The output port place of described inflation valve (2) respectively with standard substance interface, analyte interface, vent valve (4) and the 2nd pressure transmitter (7) and connect, and standard substance interface and analyte interface are all connected with inflation valve (2) by being provided with the air flue of equilibrium valve (3);
The input terminus of described vent valve (4) is connected with inflation valve (2), and its output terminal is provided with venting port (10);
Differential pressure pick-up (5) it is provided with between described standard substance interface and analyte interface;
Described control unit comprises PWM controller (11), and described PWM controller (11) is electrically connected with inflation valve (2), equilibrium valve (3) and vent valve (4) respectively.
2. the airtight leak locator of differential pressure type of a kind of PWM Controlling solenoid valve according to claim 1, it is characterized in that: described control unit also comprises input unit (12) and display equipment (14), described input unit (12) is connected with PWM controller (11) signal, and described PWM controller (11) is connected with described display equipment (14) signal.
3. the airtight leak locator of differential pressure type of a kind of PWM Controlling solenoid valve according to claim 1, it is characterised in that: described inflation valve (2) and equilibrium valve (3) are 2/2-way normally closed solenoid valve.
4. the airtight leak locator of differential pressure type of a kind of PWM Controlling solenoid valve according to claim 1, it is characterised in that: described vent valve (4) is 2/2-way normally open solenoid valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521013229.5U CN205280304U (en) | 2015-12-08 | 2015-12-08 | Airtight leakage detector of differential pressure formula with PWM control solenoid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521013229.5U CN205280304U (en) | 2015-12-08 | 2015-12-08 | Airtight leakage detector of differential pressure formula with PWM control solenoid |
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| CN205280304U true CN205280304U (en) | 2016-06-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372024A (en) * | 2015-12-08 | 2016-03-02 | 天津博益气动股份有限公司 | Differential pressure type air tightness leak detection instrument using PWM to control solenoid valve and leak detection method of differential pressure type air tightness leak detection instrument |
| CN113092036A (en) * | 2021-04-07 | 2021-07-09 | 绍兴第二医院医共体总院(绍兴第二医院) | Electromagnetic valve capable of monitoring gas leakage and working method |
-
2015
- 2015-12-08 CN CN201521013229.5U patent/CN205280304U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372024A (en) * | 2015-12-08 | 2016-03-02 | 天津博益气动股份有限公司 | Differential pressure type air tightness leak detection instrument using PWM to control solenoid valve and leak detection method of differential pressure type air tightness leak detection instrument |
| CN113092036A (en) * | 2021-04-07 | 2021-07-09 | 绍兴第二医院医共体总院(绍兴第二医院) | Electromagnetic valve capable of monitoring gas leakage and working method |
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