CN112286242A - Gas pressure control device - Google Patents
Gas pressure control device Download PDFInfo
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- CN112286242A CN112286242A CN201910674321.2A CN201910674321A CN112286242A CN 112286242 A CN112286242 A CN 112286242A CN 201910674321 A CN201910674321 A CN 201910674321A CN 112286242 A CN112286242 A CN 112286242A
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- 238000001914 filtration Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims description 84
- 238000003860 storage Methods 0.000 claims description 40
- 238000009826 distribution Methods 0.000 claims description 27
- 238000005259 measurement Methods 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 13
- 239000000523 sample Substances 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 8
- 238000003780 insertion Methods 0.000 abstract description 4
- 230000037431 insertion Effects 0.000 abstract description 4
- 230000000712 assembly Effects 0.000 abstract description 3
- 238000000429 assembly Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 197
- 239000002912 waste gas Substances 0.000 description 10
- 238000009530 blood pressure measurement Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000007689 inspection Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 238000007791 dehumidification Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 239000012535 impurity Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
- G05D16/2026—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means
- G05D16/2033—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means the plurality of throttling means being arranged in series
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The invention provides a gas pressure control device, which comprises an interface module, a control execution module and a control module, wherein the control module comprises a control circuit board, the control circuit board controls the power on or off of an electromagnetic valve connected in series in a gas path of the control execution module so as to control pressure gas input by an external air pump or an external gas cylinder to flow in order in the gas path of the control execution module, and further control the pressure gas at a preset pressure value and output from the interface module. The device adopts a modular design, the modules are connected in an interface insertion tube mode, and the device is simple to operate, reliable to work and convenient to maintain; the appropriate interface module can be replaced according to the measuring range and the precision of the detected pressure instrument, or the high-low pressure switching valve is controlled to switch among different measuring assemblies, so that the adaptability is good; the spiral dehumidifying and filtering unit is adopted to dehumidify and filter the input pressure gas so as to form clean and dry pressure gas.
Description
Technical Field
The invention belongs to the technical field of gas pressure inspection, and particularly relates to a high-precision gas pressure control device with a modular design.
Background
At present, in the field of gas pressure inspection, portable gas pressure inspection instruments for inspecting pressure instruments to be inspected on site are widely used. In the existing gas pressure calibrator, a gas pressure control device for stabilizing standard pressure output is provided, valve seats are usually fixed on a fixed frame, and the valve seats are connected with gas circuits through connecting pipelines, so that the calibrator has no universality and is inconvenient to maintain and replace devices.
The interface part of the existing gas pressure control module is provided with a measuring component, different detection modules are required to be arranged for gas pressures with different measurement and precision, and then different interface parts are configured to be matched with the measuring component, so that the adaptability is poor, the cost is high, and the maintenance is difficult. The existing gas-liquid separation mode can only isolate impurities entering a pressure instrument to be detected, and cannot remove water vapor in input gas, so that the dehumidification function cannot be realized.
Disclosure of Invention
The invention provides a gas pressure control device, which adopts a modular design, has a simple structure and is convenient to maintain.
The invention adopts the following technical scheme:
a gas pressure control device comprises an interface module (01), a control execution module (02) and a control module (03), wherein the control module (03) comprises a control circuit board (031), the control circuit board (031) is connected in series with a solenoid valve in a gas path of the control execution module (02) in a control mode to be powered on or powered off so as to control pressure gas input by an external gas pump or a gas cylinder to flow in order in the gas path of the control execution module (02), the pressure gas is controlled to be at a preset pressure value and is output from the interface module (01), the interface module (1) comprises a fixed supporting unit (1) internally provided with a gas pipeline unit (2), and a gas input pipeline (25) of the gas pipeline unit (2) is communicated with a dehumidifying gas output pipeline (26) through a spiral filtering unit (5);
the spiral dehumidifying filter unit (5) comprises:
the liquid storage cylinder (51) is arranged on the fixed supporting unit (1), and a spiral groove (511) is formed in the inner wall of the liquid storage cylinder and extends upwards from the bottom;
the bottom of the central breather pipe (52) is communicated with the gas input pipeline (25), and the top of the central breather pipe penetrates through the bottom of the liquid storage cylinder (51) and extends to the upper part of the liquid storage cylinder; and
the middle part of the isolating umbrella (53) is hermetically buckled with the upper end of the central vent pipe (52), one side of the isolating umbrella is provided with a lateral through hole (531) communicated with the central vent pipe (52), and a gap is arranged between the umbrella-shaped edge of the isolating umbrella (53) and the inner wall of the liquid storage cylinder (51).
In the gas pressure control device, the gas output pipeline (26) is arranged at one side of the bottom of the liquid storage cylinder (51) and is communicated with the inside of the liquid storage cylinder.
In the gas pressure control device, one end of a liquid discharge pipeline (24) in the gas pipeline unit (2) is arranged at the bottom of the liquid storage cylinder (51) and communicated with the inside of the liquid storage cylinder, the other end of the liquid discharge pipeline is communicated with the atmosphere, and a liquid discharge electromagnetic valve (4) is connected on the liquid discharge pipeline (24) in series.
In the gas pressure control device, the interface module (01) further comprises one or more measuring modules (3), the measuring modules (3) are mounted on the side surface of the fixed supporting unit (1) and exposed, and the measuring modules (3) are electrically connected to a control circuit board (031) of the control module (03).
In the gas pressure control device, two measuring modules (3) are arranged, and each measuring module comprises a high-pressure measuring module (31) and a low-pressure measuring module (32), wherein the high-pressure measuring module (31) is communicated with the gas input pipeline (25) through a high-pressure measuring pipeline (22); the low-pressure measuring module (32) is communicated with the gas input pipeline (25) through a low-pressure measuring pipeline (23), and the low-pressure measuring pipeline (23) is connected with a high-pressure and low-pressure switching valve (7) in series so as to control the on-off of the low-pressure measuring module (32) and the gas input pipeline (25).
Among the above-mentioned gas pressure controlling means, control execution module (02) is equipped with disk seat (7), disk seat (7) are including being equipped with malleation gas capacitance (711), the air capacitance cavity (71) of negative pressure gas capacitance (712) and positive negative pressure output pipeline (84) and being equipped with malleation disk seat (72) of malleation distribution pipeline (81) and being equipped with negative pressure valve seat (73) of negative pressure distribution pipeline (82) in, malleation gas capacitance (711) communicate through malleation distribution pipeline (81) and external air pump or gas cylinder delivery outlet, through positive negative pressure output pipeline (84) and with gas input passageway (25) of interface module (01) intercommunication, negative pressure gas capacitance (712) communicate through negative pressure distribution pipeline (82) and external air pump or gas cylinder input port, through positive negative pressure output pipeline (84) and gas input passageway (25) intercommunication of interface module (01).
In the gas pressure control device, the positive pressure gas distribution pipeline (81) is communicated with the positive pressure gas container (711) through a second electromagnetic valve (V2) and is communicated with a liquid discharge pipeline (24) arranged in the interface module (01) through a first electromagnetic valve (V1); the negative pressure air distribution pipeline (82) is communicated with the negative pressure air capacitor (712) through a fourth electromagnetic valve (V4), the fourth electromagnetic valve (V4) is a three-way electromagnetic valve, a normally closed channel of the three-way electromagnetic valve is connected in series with the negative pressure air distribution pipeline (82), and a normally open channel of the three-way electromagnetic valve is communicated with the atmosphere through an air inlet (94) formed in the bottom of a negative pressure valve seat (73).
In the gas pressure control device, the positive and negative pressure output pipeline (84) is communicated with the positive pressure air volume (711) through a third electromagnetic valve (V3) and is communicated with the negative pressure air volume (712) through a sixth electromagnetic valve (V6) and a fifth electromagnetic valve (V5) in sequence, the fifth electromagnetic valve (V5) is a three-way electromagnetic valve, a normally closed channel of the three-way electromagnetic valve is connected between the negative pressure air volume (712) and the positive and negative pressure output pipeline (84) in series, and a normally open channel of the five-way electromagnetic valve is connected to and arranged in the liquid discharge pipeline (24) in the interface module (01).
In the above gas pressure control device, the control execution module (02) further includes a pressure sensor assembly (10) electrically connected to the control circuit board (031), and a detection probe of the pressure sensor assembly (10) extends into the gas container cavity (71) to sense the gas pressure value in the gas container cavity.
Among the above-mentioned gas pressure control device, control module (03) still is equipped with circuit board cover (0331) and side face cover (0332), and circuit board cover (0331) covers on control circuit board (031), and the side face cover (0332) is installed in the side of control execution module (02) and interface module (01).
Due to the adoption of the design, the invention has the following characteristics:
the device adopts a modular design, the modules are connected in an interface insertion tube mode, and the electric connecting wire adopts a golden finger insertion mode, so that the operation is simple, the work is reliable, and the maintenance is convenient; the appropriate interface module can be replaced according to the measuring range and the accuracy of the detected pressure instrument, or the high-low pressure switching valve is controlled to switch among different measuring assemblies, so that the adaptability is good, and the detection accuracy is ensured; and a spiral dehumidifying and filtering unit is adopted to dehumidify and filter the input pressure gas so as to form clean and dry pressure gas and prevent residual liquid in the detected pressure instrument from entering the detecting instrument through the interface device.
Drawings
FIG. 1 is an exploded view of a gas pressure control device according to the present invention;
FIG. 2A is a first schematic perspective view of a control execution module;
FIG. 2B is a schematic perspective view of a control execution module;
FIG. 2C is a gas path connection block diagram of the control execution module;
fig. 3A is a schematic perspective view of an interface module;
fig. 3B is a schematic perspective view of an interface module;
FIG. 3C is a longitudinal cut-away view of the interface module;
FIG. 3D is a schematic diagram of the gas path connection of the high-low pressure switching valve;
FIG. 3E is a gas path connection block diagram of the interface module;
FIG. 3F is a schematic diagram of an embodiment of a spiral dehumidification filter unit;
fig. 4 is an exploded view of the control module.
The main labels are as follows:
100-gas pressure control means;
01-an interface module;
1-fixed supporting unit, 11-base, 12-measuring component seat, 13-supporting plate, 14-interface mounting seat;
2-gas pipeline unit, 21-gas main pipeline, 22-high pressure measuring pipeline, 23-low pressure measuring pipeline, 24-liquid discharge pipeline, 25-gas input pipeline and 26-gas output pipeline;
3-measuring component, 31-high voltage measuring component, 32-low voltage measuring component;
41-a liquid discharge electromagnetic valve and 42-a high-low pressure switching valve;
5-spiral dehumidification filtering unit, 51-liquid storage cylinder, 511-spiral groove, 52-central vent pipe, 53-isolating umbrella, 531-lateral through hole;
6-interface unit, 61-input interface, 62-output interface, 63-liquid discharge port, 64-waste gas inlet;
02-control execution module;
7-valve seat, 71-air volume cavity, 711-positive pressure air volume and 712-negative pressure air volume; 72-positive pressure valve seat, 73-negative pressure valve seat, 74-elastic spacer;
8-an air passage, 81-a positive pressure air distribution pipeline, 82-a negative pressure air distribution pipeline, 83-an exhaust emission pipeline and 84-a positive and negative pressure output pipeline;
9-gas path interface, 91-positive pressure input interface, 92-negative pressure input interface, 93-positive and negative pressure output interface, 94-gas inlet, 95-waste gas output interface;
10-pressure sensor assembly, 101-electrical connection line;
the electromagnetic valve group comprises a V-electromagnetic valve group, a V1-first electromagnetic valve, a V2-second electromagnetic valve, a V3-third electromagnetic valve, a V4-fourth electromagnetic valve, a V5-fifth electromagnetic valve and a V6-sixth electromagnetic valve;
03-control module, 031-control circuit board, 032-wiring terminal, 033-protective cover, 0331-circuit board cover, 0332-side mask.
Detailed Description
The gas pressure control apparatus of the present invention will be described in detail below with reference to the following specific embodiments and the accompanying drawings.
Fig. 1 is a structural example of a gas pressure control apparatus of the present invention. Referring to fig. 1, the gas pressure control device 100 is mainly used for providing a required gas pressure for a detected pressure instrument, and adopts a modular design, and includes an interface module 01, a control execution module 02 and a control module 03, wherein the interface module 01 and the control execution module 02 are electrically connected to the control module 03, and the modules are connected with each other through a gas path in an insertion manner, wherein:
control execution module
The control execution module 02 is mainly used for executing the control command of the control module 03, and realizes accurate control of the pressure of the output gas through controlling the electromagnetic valves connected in series on the gas circuit. Referring to fig. 2A to 2C, the control execution module 02 includes a valve seat 7, an air passage channel 8 disposed in the valve seat 7, a solenoid valve group V connected in series on the air passage channel 8, a pressure sensor 10 for detecting gas pressure, and an air passage interface 9 for connecting with an external air passage, wherein:
in this embodiment, the valve seat 7 includes a gas container cavity 71, a positive pressure valve seat 72 and a negative pressure valve seat 73, a positive pressure gas container 711 for buffering positive pressure gas and a negative pressure gas container 712 for buffering negative pressure gas are provided in the gas container cavity 71, and the positive pressure gas container 711 and the negative pressure gas container 712 are independent from each other; the positive pressure valve seat 72 and the negative pressure valve seat 73 are provided with transverse grooves to realize the connection of air passage channels in the two valve seats, and the joint of the two valve seats is provided with an elastic spacer 74 to realize the air passage sealing between the two valve seats and the plugging of a fabrication hole; the two valve seats are connected together through the pressing sheet and the screw in a matching mode and used for arranging an air path channel and installing an electromagnetic valve group V for controlling the on-off of the air path.
The present invention is not limited to the arrangement of the air passage 8 in the valve seat 7 and the specific installation position of each solenoid valve in the solenoid valve group V, and will be described as an exemplary embodiment.
Referring to fig. 2C, the air path channel 8 includes a positive pressure air distribution pipeline 81, a negative pressure air distribution pipeline 82, a waste gas discharge pipeline 83, and a positive and negative pressure output pipeline 84, and the air path interface 9 is disposed on the valve seat 7 and includes a positive pressure input interface 91, a negative pressure input interface 92, a positive and negative pressure output interface 93, an air inlet 94, and a waste gas output interface 95. As shown in fig. 2A, the positive pressure air distribution pipeline 81 is disposed in the positive pressure valve seat 72, the positive pressure input port 91 is disposed at an end of the positive pressure valve seat 72, the positive pressure input port 91 is communicated with the positive pressure air volume 711 through the positive pressure air distribution pipeline 81, and the second electromagnetic valve V2 in the electromagnetic valve group V is a two-way electromagnetic valve and is connected in series to the positive pressure air distribution pipeline 81; referring to fig. 2B, the negative pressure air distribution pipeline 82 is disposed in the negative pressure valve seat 73, the negative pressure input interface 92 is disposed at an end of the negative pressure valve seat 73, the negative pressure input interface 92 is communicated with the negative pressure air volume 712 through the negative pressure air distribution pipeline 82, the fourth electromagnetic valve V4 in the electromagnetic valve group V is a three-way electromagnetic valve, a normally closed channel thereof is connected in series to the negative pressure air distribution pipeline 82, and a normally open channel thereof is communicated with the atmosphere through an air inlet 94 disposed at the bottom of the negative pressure valve seat 73.
The positive and negative pressure output pipeline 84 is arranged in the air volume cavity 71, and a third electromagnetic valve V3 in the electromagnetic valve group V is a two-way electromagnetic valve and is connected in series between the positive pressure air volume 711 and the positive and negative pressure output channel 84, and is used for controlling the on-off between the positive pressure air volume 711 and the positive and negative pressure output channel 84. The negative pressure air volume 712 is communicated with the positive and negative pressure output pipeline 84 through a fifth electromagnetic valve V5 and a sixth electromagnetic valve V6 in the electromagnetic valve group V in sequence, wherein the sixth electromagnetic valve V6 is a two-way normally closed electromagnetic valve, the fifth electromagnetic valve V5 is a three-way electromagnetic valve, a normally closed channel of the fifth electromagnetic valve V5 is connected in series between the negative pressure air volume 712 and the positive and negative pressure output pipeline 84, and a normally open channel is connected to the waste gas discharge pipeline 83. The exhaust gas discharge pipeline 83 crosses the positive pressure valve seat 72, the negative pressure valve seat 73 and the elastic spacer 74, a first electromagnetic valve V1 in the electromagnetic valve group V is a two-way normally closed electromagnetic valve and is connected in series between the exhaust gas discharge pipeline 83 and the positive pressure gas distribution pipeline 81, a normally open channel of a fifth electromagnetic valve V5 is connected in series between the negative pressure gas distribution pipeline 82 and the exhaust gas discharge pipeline 83, and the exhaust gas is connected into the exhaust gas inlet 64 in the interface module 01 from the exhaust gas output interface 95 through the exhaust gas discharge pipeline 83.
In order to realize accurate control of the gas pressure in the gas container cavity 71, the positive pressure gas container 711 and the negative pressure gas container 712 are correspondingly provided with the pressure sensor assembly 10, and the detection probes of the pressure sensor assembly 10 respectively extend into the cavities of the positive pressure gas container 711 and the negative pressure gas container 712 for accurately sensing the gas pressure in the cavities. The pressure signal of the pressure sensor assembly 10 is led out through an electrical connection line 101 to the control module 03. Preferably, a flat wire is used as the lead-out of the electric connection wire 101, so that the operation is convenient and the work is reliable.
The control execution module 02 of the invention can simultaneously buffer positive pressure gas and negative pressure gas by arranging the positive pressure gas container 711 and the negative pressure gas container 712, can simultaneously play a buffer role as a gas source, and can accurately control the gas pressure by matching with the power-on or power-off operation of the electromagnetic valve in the electromagnetic valve group V to prevent the external air pump from being frequently started.
Interface module
The interface module 01 is mainly used for detecting the gas pressure input by the control execution module 02, and provides a gas output interface for connecting the detected pressure instrument, and inputting the pressure gas into the detected pressure instrument to realize the detection of the detected pressure instrument. Interface module 01 is modular structure design, refers to fig. 3A to 3D, including fixed support unit 1 and the installation gas pipeline unit 2, measuring component 3, spiral dehumidification filter unit 5 and the interface unit 6 of setting on fixed support unit 1, wherein:
referring to fig. 3A and 3B, in this embodiment, the fixed supporting unit 1 includes a base 11, a measuring component seat 12, a supporting plate 13, and an interface mounting seat 14, the spiral dehumidifying filter unit 5 is fixed on the base 11, the measuring component 3 is mounted on the side of the measuring component seat 12, and the interface unit 6 is disposed on the base 11 and the interface mounting seat 14; the supporting plate 13 is located at the joint of the bottom of the base 11 and the bottom of the measuring component seat 12, and the base and the measuring component seat are connected into a whole through a screw fixing mode or a welding mode.
As shown in fig. 3C, the gas pipeline unit 2 is disposed in the fixed supporting unit 1, and includes a main gas pipeline 21 horizontally penetrating through the base 11 and the measuring component seat 12, a high-pressure measuring pipeline 22 and a low-pressure measuring pipeline 23 disposed on the measuring component seat 12, a liquid discharge pipeline 24 disposed independently of the main gas pipeline 21, a gas input pipeline 25 and a gas output pipeline 26, the gas input pipeline 25 is communicated with the main gas pipeline 21, the gas output pipeline 26 is communicated with the main gas pipeline 21 through the spiral dehumidifying and filtering unit 5, and external pressure gas enters the spiral dehumidifying and filtering unit 5 through the main gas pipeline 21 and is output from the gas output pipeline 26 after being dehumidified and filtered; the liquid discharge pipeline 24 is communicated with the spiral dehumidifying and filtering unit 5, and liquid and impurities separated by the spiral dehumidifying and filtering unit 5 are discharged through the liquid discharge pipeline 24. The measuring component 3, the spiral dehumidifying and filtering unit 5 and the interface unit 6 of the interface module of the present invention form a gas circuit connection through each gas pipeline of the gas pipeline unit 2, and for a specific connection condition, please refer to the following description.
Referring to fig. 3A to 3E, the interface unit 6 includes an input interface 61, an output interface 62, a liquid discharge port 63, and an exhaust gas inlet 64, the input interface 61 is disposed on the base 11 and communicated with the gas input duct 25, and the output interface 62 is disposed on the interface mounting seat 14 and communicated with the gas output duct 26; the liquid discharge port 63 and the waste gas inlet 64 are arranged on the side surface of the base 11 and are respectively communicated with the liquid discharge pipeline 24, the liquid discharge pipeline 24 is connected with the liquid discharge electromagnetic valve 4 in series, and the on-off of the liquid discharge channel 24 is controlled by the liquid discharge electromagnetic valve 4, so that the working time sequence of the device is controlled.
Referring to fig. 3B and 3D, in this embodiment, the measuring assembly 3 is provided with two, respectively, a high-pressure measuring assembly 31 and a low-pressure measuring assembly 32, which are mounted on the side of the measuring assembly base 12, and are preferably fixed to the measuring assembly base 12 by non-removable screws; the measuring component 3 is exposed outside the fixed supporting unit 1, and measuring components with different measuring ranges and precision can be replaced conveniently according to detection requirements. The high-pressure measuring component 31 and the low-pressure measuring component 32 can be selected from detection module models commonly used in the market, the high-pressure measuring component and the low-pressure measuring component have different detection ranges and detection accuracies, and generally, the gas pressure detection range of the low-pressure measuring component 32 is small, and the detection accuracy is high. The high-pressure measuring component 31 is provided with a high-pressure measuring port which is communicated with the gas main pipeline 21 through a high-pressure measuring pipeline 22; the low pressure measuring assembly 32 is provided with a low pressure measuring port which is communicated with the gas main pipeline 21 through a low pressure measuring pipeline 23, and the low pressure measuring pipeline 23 is connected with a high-low pressure switching valve 42 in series for controlling the on-off of the low pressure measuring port and the gas main pipeline 21.
Preferably, the high-low pressure switching valve 42 and the liquid discharge solenoid valve 4 are both two-way normally closed solenoid valves, and have two working states, i.e., are electrified and disconnected. The two-way electromagnetic valve can be an existing two-way electromagnetic valve and can achieve the purpose of the invention.
The spiral dehumidifying and filtering unit 5 is used for dehumidifying and filtering the input pressure gas to form clean and dry pressure gas and prevent the liquid remained in the tested pressure instrument from entering the device through the interface module. Referring to fig. 3F, the spiral dehumidifying filter unit 5 includes a liquid storage cylinder 51 and a central vent pipe 52, the liquid storage cylinder 51 is a sealed cylinder with a cavity, and is mounted on the base 11, and a spiral groove 511 is formed on the inner wall of the cylinder and extends upwards from the bottom; the central vent pipe 52 is a hollow pipe with a closed upper end, is fixed on the base 11, has a bottom communicated with the main gas pipe 21, and has a top penetrating through the bottom of the liquid storage cylinder 51 and extending to the upper part of the liquid storage cylinder 51; the upper part of the central vent pipe 52 is provided with a separation umbrella 53, the middle part of the separation umbrella 53 is sealed and buckled with the upper end of the central vent pipe 52, one side of the separation umbrella 53 is provided with a lateral through hole 531, the inside of the liquid storage cylinder 51 is communicated with the central vent pipe 52 through the lateral through hole, and a gap is arranged between the umbrella-shaped edge of the separation umbrella 53 and the inner wall of the liquid storage cylinder 51.
One end of the gas output pipeline 26 is arranged on the lower side surface of the liquid storage cylinder 51, and the cavity of the liquid storage cylinder 51 is communicated with the gas output pipeline 26. One end of the liquid drainage pipeline 24 is arranged at the bottom of the liquid storage cylinder 51, and the cavity of the liquid storage cylinder 51 is communicated with the liquid drainage pipeline 24.
The pressure gas in the main gas pipe 21 flows from the lateral through hole 531 of the isolating umbrella 53 to the side surface through the central vent pipe 52, the isolating umbrella 53 prevents the pressure gas from flowing directly downwards, but forces the gas flow to flow along the spiral groove 511 from the inner wall of the liquid storage cylinder 51, in the process that the gas flow impacts the spiral groove 511 on the inner wall of the liquid storage cylinder, moisture particles in the gas impact and attach to the cylinder wall, and most of the gas flow flows spirally under the guidance of the spiral groove 511. Meanwhile, after passing through a gap between the isolating umbrella 53 and the inner wall of the liquid storage cylinder, the cross section of a channel of the air flow is enlarged, the flow velocity of the air flow is reduced according to the Bernoulli effect, and moisture particles in the air are attached to the surface of the spiral groove 511 and cannot be taken away by the air flow, so that the moisture particles are gradually gathered and enlarged, and finally water drops are formed and are left along the wall of the liquid storage cylinder. Since the lateral through hole 531 of the isolating umbrella 53 is located at the upper portion of the liquid storage cylinder 51, the liquid will be stored at the bottom of the liquid storage cylinder 51 and will not flow back to the air passage.
In the inspection process, the input pressure gas is input from the input interface 61, enters the liquid storage cylinder 51 through the gas input channel 25, the gas main pipeline 21 and the central vent pipe 52, flows along the spiral groove from the inner wall of the liquid storage cylinder 51, and enters the pressure instrument to be inspected from the gas output pipeline 26 and the output interface 62 when reaching the lower part of the liquid storage cylinder 51, at the moment, the liquid discharge electromagnetic valve 4 is in a closed state, and accumulated liquid is left at the bottom of the liquid storage cylinder 51 due to the gas with certain pressure in the liquid discharge pipeline 24; when the inspection process is finished, the liquid discharge electromagnetic valve 4 is opened, and liquid is discharged through the liquid discharge pipeline 24 through the liquid discharge port 63 under the action of pressure gas, so that gas-liquid separation and self-cleaning are realized.
According to the range and the precision of the detected pressure instrument, the high-pressure and low-pressure switching valve 42 can be controlled to switch between the high-pressure measuring assembly 31 and the low-pressure measuring assembly 32, namely, the high-pressure and low-pressure switching valve 42 is closed when high pressure is measured, the high-pressure measuring port of the high-pressure measuring assembly 31 is communicated with the gas main pipeline 21 and the gas input pipeline 25, and the high-pressure measuring assembly 31 works independently; when measuring low pressure (generally, the measurement precision is relatively high, and the high-pressure measurement assembly 31 cannot meet the requirement), the high-low pressure switching valve 42 is opened, the high-pressure measurement port of the high-pressure measurement assembly 31 and the low-pressure measurement port of the low-pressure measurement assembly 32 are both communicated with the gas main pipe 21 and the gas input pipe 25, the high-pressure measurement assembly 31 and the low-pressure measurement assembly 32 work, and the measurement result is based on the low-pressure measurement assembly 32 with high precision.
The automatic and orderly control of the device needs to electrically connect the high-pressure measuring component 31, the low-pressure measuring component 32, the high-low pressure switching valve 42 and the liquid discharge electromagnetic valve 4 to the control module 03, and the control module 03 controls the action of each electromagnetic valve according to a preset control sequence and receives the detection data of the measuring components.
It should be noted that the above-mentioned embodiments of the present invention do not limit the scope of the present invention, but are merely examples provided to facilitate understanding of the inventive concept, and various modifications and improvements may be made to the structure of the inventive device within the scope of the inventive concept, for example, the number of the measuring assemblies 3 is not limited to two, and may be one or more; the installation of the measuring component 3 is not limited to the side surface of the measuring component seat 12, and the measuring component can be flexibly arranged according to space requirements and structural shapes; the high-low pressure switching valve 42 can be a three-way electromagnetic valve, a high pressure measuring port of the high pressure measuring assembly 31 is connected with a normally closed end of the three-way electromagnetic valve, a low pressure measuring port of the low pressure measuring assembly 32 is connected with a common end of the three-way electromagnetic valve, a normally open end of the three-way electromagnetic valve is connected with the atmosphere, the three-way electromagnetic valve is not electrified when measuring high pressure, the high pressure measuring port of the high pressure measuring assembly 31 is communicated with the gas main pipeline 21 and the gas input pipeline 25, and a low pressure measuring port of the low pressure measuring assembly 32 is communicated with the atmosphere, so that the low pressure; when measuring low pressure, the three-way electromagnetic valve is electrified, the normally closed end is communicated (opened) with the public end, the normally open end is disconnected (closed) with the public end, and the low-pressure measuring port of the low-pressure measuring assembly 32 and the high-pressure measuring port of the high-pressure measuring assembly 31 are communicated with the gas main pipeline 21 and the gas input pipeline 25.
The interface module 01 of the invention adopts the modular design, can change the appropriate measuring assembly 3 according to the range and precision of the pressure instrument to be detected, or switch between the high-pressure measuring assembly 31 and the low-pressure measuring assembly 32 by controlling the high-low pressure switching valve 42, the adaptability is good, guarantee the inspection precision; the spiral dehumidifying and filtering unit 5 is used for dehumidifying and filtering the input pressure gas to form clean and dry pressure gas and prevent the liquid remained in the detected pressure instrument from entering the device of the invention through the interface module.
Control module
Referring to fig. 1 and 4, the control module 03 includes a control circuit board 031 and a connection terminal 032 installed on the control circuit board 031, and the electrical connection line 101 of each solenoid valve and the pressure sensor assembly 10 in the solenoid valve group V in the control execution module 02 and the measurement assembly 3 in the interface module 03 are electrically connected to the control circuit board 031 through the connection terminal 032. The control circuit board 031 receives data signals detected by the measurement component 3 and the pressure sensor component 10, and generates control commands according to control targets and control logic to send to control ends of the electromagnetic valves of the electromagnetic valve group V, so as to control the actions of the electromagnetic valves to realize accurate gas pressure control.
Further, the control module 03 further includes a protection cover 033 for protecting and fixing the control circuit board 031, referring to fig. 4, the protection cover 033 includes a circuit board cover 0331 and a side cover 0332, the circuit board cover 0331 covers the control circuit board 031, and the side cover 0332 is installed on the control execution module 02 and the interface module 01, so as to isolate the solenoid valve group V from the outside, and reduce the thermal influence of the solenoid valve heat radiation on other circuit boards, measurement boards, and other systems.
The modules of the gas pressure control device 100 are independent of each other and are connected in a plugging mode through the gas circuit interfaces, and the electric connecting wires are all connected in a gold finger plugging mode, so that the gas pressure control device is simple to operate, reliable to work and convenient to maintain.
The device mainly has two working modes, namely a positive pressure control mode and a negative pressure control mode, and the working process is as follows:
in the positive pressure control mode, if the input interface 61 and the output interface 62 of the interface module 01 are connected to the air pump, the positive pressure air chamber 711 of the control execution module 02 is first inflated, that is, the first solenoid valve V1 is de-energized (closed), the second solenoid valve V2 is energized (on), the sixth solenoid valve V6 is de-energized (closed), the fourth solenoid valve V4 is switched to the intake port 94 to be open to the atmosphere, the fifth solenoid valve V5 is switched to the exhaust gas discharge pipe 83, at this time, air enters the air pump from the air inlet 94 through the fourth electromagnetic valve V4, high-pressure air generated by the air pump enters the positive-pressure air container 711 through the positive-pressure air distribution pipeline 81 and the second electromagnetic valve V2, at this time, the third electromagnetic valve V3 may be in a power-on state or a power-off state, and the positive pressure air chamber 711 inflates the stored pressure air until the pressure value detected by the pressure sensor assembly 10, which is acquired by the control module 03, meets a preset pressure value, and the air pump stops working.
The positive pressure gas container 711 plays a role in gas source and buffer in the gas pressure control process, the liquid storage cylinder 51 of the interface module 01 plays a role in buffer, if the pressure value of the measurement component 3 acquired by the control module 03 is smaller than the preset pressure value, the third electromagnetic valve V3 is electrified (switched on), gas enters the gas output pipeline 26 of the interface module 01, and the pressure rises; if the pressure value of the measurement component 3 acquired by the control module 03 is greater than the preset pressure value, the third electromagnetic valve V3 is powered off (closed), the sixth electromagnetic valve V6 is powered on (switched on), gas is discharged from the liquid discharge port 63 through the sixth electromagnetic valve V6, the fifth electromagnetic valve V5, the waste gas discharge pipeline 83 and the waste gas inlet 64 of the interface module 01 until the pressure value of the measurement component 3 meets the preset pressure value, and the sixth electromagnetic valve V6 is powered off.
In the positive pressure control mode, if the pressure input interface 91 of the control execution module 02 is connected to a high-pressure gas cylinder (the gas pressure in the gas cylinder is higher than the preset gas pressure), at this time, the first electromagnetic valve V1 is powered off, the second electromagnetic valve V2 is powered on (the gas cylinder is connected with the positive pressure gas container 711), the fourth electromagnetic valve V4 is switched to the gas inlet 94, the fifth electromagnetic valve is switched to the exhaust gas discharge pipeline 83, and if the pressure value of the measurement component 3 acquired by the control module 03 is smaller than the preset pressure value, the third electromagnetic valve V3 is powered on (connected), the gas output pipeline 26 of the interface module 01 is pressurized; if the pressure value of the measurement component 3 acquired by the control module 03 is greater than the preset pressure value, the third electromagnetic valve V3 is powered off (closed), the sixth electromagnetic valve V6 is powered on (switched on), gas is discharged from the liquid discharge port 63 through the sixth electromagnetic valve V6, the fifth electromagnetic valve V5, the waste gas discharge pipeline 83 and the waste gas inlet 64 of the interface module 01 until the pressure value of the measurement component 3 meets the preset pressure value, and the sixth electromagnetic valve V6 is powered off.
In the negative pressure control mode, if the positive pressure input interface 91 and the negative pressure input interface 92 of the control execution module 02 are connected to the air pump, air is firstly pumped from the negative pressure air volume 712 of the control execution module 02, that is, the first electromagnetic valve V1 is energized (the exhaust gas discharge pipeline 83 is connected), the second electromagnetic valve V2 is de-energized (the pipeline between the air pump and the positive pressure air volume 711 is disconnected), the fourth electromagnetic valve V4 is switched to the negative pressure air volume 712, the fifth electromagnetic valve V5 is switched to the exhaust gas discharge pipeline 83, at this time, air is pumped (vacuumized) from the negative pressure air volume 712 by the air pump until the pressure value measured by the pressure sensor assembly 10 obtained by the control module 03 meets the preset negative pressure value, the fourth electromagnetic valve V4 is switched to the air inlet 94, the fifth electromagnetic valve V5 is switched to the negative pressure air volume 712, the sixth electromagnetic valve V6 is energized, the air pump stops working, the negative pressure air enters the air, and then enters the pressure instrument to be tested.
In the process of controlling the gas pressure of the negative pressure gas container 712, the liquid storage cylinder 51 of the interface module 01 plays a role of a gas source, when the control module 03 obtains that the pressure value measured by the measuring component 3 is greater than a preset negative pressure value, the sixth electromagnetic valve V6 is electrified, the negative pressure gas container 712 and the gas output pipeline 26 of the interface module 01 are connected, the gas in the gas output pipeline 26 is sucked into the negative pressure gas container 712 until the pressure value measured by the measuring component 3 meets the preset negative pressure value, and then the sixth electromagnetic valve V6 is powered off; when the control module 03 obtains that the pressure value measured by the measurement component 3 is smaller than the preset negative pressure value, the third electromagnetic valve V3 is powered on, the positive pressure gas container 711 and the gas output pipeline 26 are connected, gas (equal to atmospheric pressure) in the positive pressure gas container 711 enters the gas output pipeline 26 until the pressure value measured by the measurement component 3 meets the preset negative pressure value, and then the third electromagnetic valve V3 is powered off.
It can be known from the working process of the gas pressure control device of the present invention that the third electromagnetic valve V3, the sixth electromagnetic valve V6 and the air pump are always in a dynamic and intermittent switching state, and the state is changed under the control of the control module 03, the positive pressure gas container 711 and the negative pressure gas container 712 function as a pressure source, and the liquid storage cylinder 51 performs a buffering function, so as to facilitate the stability of the gas pressure control and realize the precise control of the gas pressure.
It will be understood by those skilled in the art that these examples or embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention, and that various equivalent modifications and changes may be made to the present invention without departing from the spirit of the present disclosure.
Claims (10)
1. The gas pressure control device is characterized by comprising an interface module (01), a control execution module (02) and a control module (03), wherein the control module (03) comprises a control circuit board (031), the control circuit board (031) is connected in series with a solenoid valve in a gas path of the control execution module (02) in a control mode to be powered on or powered off so as to control pressure gas input by an external gas pump or gas cylinder to flow in order in the gas path of the control execution module (02), and then the pressure gas is controlled to be at a preset pressure value and is output from the interface module (01), wherein the interface module (1) comprises a fixed supporting unit (1) internally provided with a gas pipeline unit (2), and a gas input pipeline (25) of the gas pipeline unit (2) is communicated with a gas output pipeline (26) through a spiral filtering and dehumidifying unit (5);
the spiral dehumidifying filter unit (5) comprises:
the liquid storage cylinder (51) is arranged on the fixed supporting unit (1), and a spiral groove (511) is formed in the inner wall of the liquid storage cylinder and extends upwards from the bottom;
the bottom of the central breather pipe (52) is communicated with the gas input pipeline (25), and the top of the central breather pipe penetrates through the bottom of the liquid storage cylinder (51) and extends to the upper part of the liquid storage cylinder; and
the middle part of the isolating umbrella (53) is hermetically buckled with the upper end of the central vent pipe (52), one side of the isolating umbrella is provided with a lateral through hole (531) communicated with the central vent pipe (52), and a gap is arranged between the umbrella-shaped edge of the isolating umbrella (53) and the inner wall of the liquid storage cylinder (51).
2. The gas pressure control apparatus according to claim 1, wherein the gas output pipe (26) is provided at a bottom side of the reservoir (51) and communicates with an inside of the reservoir.
3. The gas pressure control device according to claim 1 or 2, wherein a liquid discharge pipe (24) in the gas piping unit (2) has one end disposed at the bottom of the liquid storage cylinder (51) and communicated with the inside of the liquid storage cylinder, and the other end communicated with the atmosphere, and a liquid discharge solenoid valve (4) is connected in series to the liquid discharge pipe (24).
4. The gas pressure interface device according to any one of claims 1 to 3, wherein the interface module (01) further comprises one or more measurement modules (3), the measurement modules (3) are mounted on the side surface of the fixed support unit (1) and exposed, and the measurement modules (3) are electrically connected to the control circuit board (031) of the control module (03).
5. Gas pressure interface device according to one of claims 1 to 4, characterized in that the measuring modules (3) are provided in two, comprising a high pressure measuring module (31) and a low pressure measuring module (32), the high pressure measuring module (31) being in communication with the gas inlet conduit (25) via a high pressure measuring conduit (22); the low-pressure measuring module (32) is communicated with the gas input pipeline (25) through a low-pressure measuring pipeline (23), and the low-pressure measuring pipeline (23) is connected with a high-pressure and low-pressure switching valve (7) in series so as to control the on-off of the low-pressure measuring module (32) and the gas input pipeline (25).
6. The gas pressure interface device according to any one of claims 1 to 5, the control execution module (02) is provided with a valve seat (7), the valve seat (7) comprises a gas-containing cavity (71) provided with a positive pressure gas-containing chamber (711), a negative pressure gas-containing chamber (712) and a positive pressure output pipeline (84), a positive pressure valve seat (72) provided with a positive pressure gas distribution pipeline (81) and a negative pressure valve seat (73) provided with a negative pressure gas distribution pipeline (82), the positive pressure gas-containing chamber (711) is communicated with an external air pump or an air bottle output port through the positive pressure gas distribution pipeline (81), is communicated with a gas input channel (25) of the interface module (01) through the positive pressure output pipeline (84), and the negative pressure gas-containing chamber (712) is communicated with an external air pump or an air bottle input port through the negative pressure gas distribution pipeline (82) and is communicated with a gas input channel (25) of the interface module (01) through the positive pressure.
7. The gas pressure interface device according to claim 6, characterized in that the positive pressure gas distribution conduit (81) communicates with the positive pressure gas container (711) through a second solenoid valve (V2) and communicates with a liquid discharge conduit (24) provided in the interface module (01) through a first solenoid valve (V1); the negative pressure air distribution pipeline (82) is communicated with the negative pressure air capacitor (712) through a fourth electromagnetic valve (V4), the fourth electromagnetic valve (V4) is a three-way electromagnetic valve, a normally closed channel of the three-way electromagnetic valve is connected in series with the negative pressure air distribution pipeline (82), and a normally open channel of the three-way electromagnetic valve is communicated with the atmosphere through an air inlet (94) formed in the bottom of a negative pressure valve seat (73).
8. The gas pressure interface device according to claim 6 or 7, wherein the positive-negative pressure output pipeline (84) is communicated with the positive pressure air volume (711) through a third solenoid valve (V3) and is communicated with the negative pressure air volume (712) through a sixth solenoid valve (V6) and a fifth solenoid valve (V5) in sequence, the fifth solenoid valve (V5) is a three-way solenoid valve, a normally closed channel of the three-way solenoid valve is connected between the negative pressure air volume (712) and the positive-negative pressure output pipeline (84) in series, and a normally open channel of the five-way solenoid valve is connected to a liquid discharge pipeline (24) arranged in the interface module (01).
9. The gas pressure interface device according to any one of claims 6 to 8, wherein the control execution module (02) further comprises a pressure sensor assembly (10) electrically connected to the control circuit board (031), and a detection probe of the pressure sensor assembly (10) extends into the gas chamber body (71) to sense a gas pressure value in the chamber body.
10. The gas pressure interface device according to any of claims 1 to 9, wherein the control module (03) is further provided with a circuit board cover (0331) and a side cover (0332), the circuit board cover (0331) is covered on the control circuit board (031), and the side cover (0332) is installed at the side of the control execution module (02) and the interface module (01).
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| CN201910674321.2A CN112286242A (en) | 2019-07-25 | 2019-07-25 | Gas pressure control device |
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| CN201910674321.2A CN112286242A (en) | 2019-07-25 | 2019-07-25 | Gas pressure control device |
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