CN112284616A - Gas pressure interface device - Google Patents
Gas pressure interface device Download PDFInfo
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- CN112284616A CN112284616A CN201910679305.2A CN201910679305A CN112284616A CN 112284616 A CN112284616 A CN 112284616A CN 201910679305 A CN201910679305 A CN 201910679305A CN 112284616 A CN112284616 A CN 112284616A
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- 239000007788 liquid Substances 0.000 claims abstract description 89
- 238000001914 filtration Methods 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims description 143
- 238000005259 measurement Methods 0.000 claims description 10
- 238000007791 dehumidification Methods 0.000 claims description 9
- 239000002912 waste gas Substances 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 2
- 238000007689 inspection Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 4
- 238000009530 blood pressure measurement Methods 0.000 description 18
- 238000001514 detection method Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
- G01L27/005—Apparatus for calibrating pressure sensors
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Abstract
The invention provides a gas pressure interface device, which comprises a fixed supporting unit, a gas pipeline unit, a measuring module, a spiral dehumidifying and filtering unit and an interface unit, wherein the spiral dehumidifying and filtering unit comprises a liquid storage cylinder, a central vent pipe and an isolating umbrella; the bottom of the central vent pipe is communicated with the gas input pipeline, and the top of the central vent pipe extends to the upper part of the liquid storage cylinder; the upper end of the central vent pipe is sealed by the isolating umbrella, a lateral through hole communicated with the central vent pipe is formed in one side of the isolating umbrella, and a gap is formed between the umbrella-shaped edge of the isolating umbrella and the inner wall of the liquid storage cylinder. The device adopts a modular design, is convenient for replacing the measuring module, or switches between the high-pressure measuring module and the low-pressure measuring module by controlling the high-low pressure switching valve, has good adaptability and ensures the inspection precision; 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 detection, and particularly relates to a gas pressure interface device which has a gas-liquid separation self-purification function and can automatically switch detection ranges.
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. The tested pressure instrument for on-site verification usually has residual liquid retained in the surface cavity, and cannot be discharged in time during the verification. These residual liquids tend to be corrosive and carry with them some solid particles. In order to prevent residual liquid in the pressure gauge to be detected from entering the pressure calibrator to corrode elements and prevent solid particles from blocking pipelines or control valves, a gas-liquid separation mechanism needs to be arranged at an interface part of the on-site pressure calibrator, so that the inside of the calibrator is ensured to be dry and clean.
The interface part of the existing pressure tester is provided with a measuring module, different measuring and precision gas pressures need to be provided with different detecting modules, and then different interface parts are configured to be matched with the measuring modules, 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 interface device, which adopts a modularized arrangement, is convenient for replacing a measuring module, can realize automatic switching of detection ranges, and realizes a gas-liquid separation self-purification function through a spiral dehumidification filtering unit.
The invention adopts the following technical scheme:
the utility model provides a gas pressure interface arrangement, includes fixed support unit (1), gas pipeline unit (2), measuring module (3) and interface unit (6), still concatenates a spiral dehumidification filter unit (5) in gas pipeline unit (2), and spiral dehumidification filter unit (5) include:
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 vent pipe (52) is communicated with a gas input pipeline (25) of the gas pipeline unit (2), and the top of the central vent 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 interface device, the gas output pipeline (26) in the gas pipeline unit (2) is arranged on one side of the bottom of the liquid storage cylinder (51) and communicated with the inside of the liquid storage cylinder.
In the gas pressure interface 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, and the liquid discharge pipeline (24) is connected with a liquid discharge electromagnetic valve (4) in series.
In the gas pressure interface device, the fixed supporting unit (1) comprises a base (11) and a measuring module seat (12), and the bottom connecting parts of the base (11) and the measuring module seat (12) are connected together through a supporting plate (13).
In the gas pressure interface device, one or more measuring modules (3) are arranged, and the measuring modules (3) are arranged on the side surface of the measuring module seat (12) and exposed.
In the gas pressure interface device, two measurement modules (3) are arranged, wherein each measurement module comprises a high-pressure measurement module (31) and a low-pressure measurement module (32), and the high-pressure measurement module (31) is communicated with a gas input pipeline (25) through a high-pressure measurement 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).
In the above gas pressure interface device, the high-low pressure switching valve (7) is a two-way normally closed solenoid valve.
In the gas pressure interface device, the high-low pressure switching valve (7) is a three-way electromagnetic valve, the high-pressure measuring pipeline (22) is connected with the normally closed end of the three-way electromagnetic valve, the low-pressure measuring pipeline (23) is connected with the common end of the three-way electromagnetic valve, and the normally open end of the three-way electromagnetic valve is communicated with the atmosphere.
Among the above-mentioned gas pressure interface arrangement, gas piping unit (2) set up in fixed supporting element (1), run through gas main pipeline (21) of base (11) and measuring module seat (12) including the level, set up high pressure measurement pipeline (22) and low pressure measurement pipeline (23) on measuring module seat (12), drain pipe (24) and gas input pipeline (25) and gas output pipeline (26) that set up independently with gas main pipeline (21), gas input pipeline (25), high pressure measurement pipeline (22), low pressure measurement pipeline (23) are linked together with gas main pipeline (21) respectively, gas output pipeline (26) are through spiral dehumidification filter unit (5) and gas main pipeline (21) intercommunication.
In the gas pressure interface device, the interface unit (6) comprises an input interface (61), an output interface (62), a liquid discharge port (63) and a waste gas inlet (64), the input interface (61) is arranged on the base (11) and communicated with the gas input pipeline (25), and the output interface (62) is communicated with the gas output pipeline (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).
Due to the adoption of the design, the invention has the following characteristics: the gas pressure interface device adopts a modular design, can replace a proper measuring module according to the measuring range and the precision of a detected pressure instrument, or switch between a high-pressure measuring module and a low-pressure measuring module by controlling a high-low pressure switching valve, has good adaptability and ensures the detection precision; 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 a first schematic perspective view of a gas pressure interface device according to the present invention;
FIG. 2 is a schematic perspective view of a second embodiment of the gas pressure interface device of the present invention;
FIG. 3 is a longitudinal cross-sectional view of the gas pressure interface device of the present invention;
FIG. 4 is a schematic diagram of the gas path connection of the high-low pressure switching valve;
FIG. 5 is a block diagram of the gas circuit connection of the gas pressure interface device of the present invention;
FIG. 6 is a schematic diagram of an embodiment of a spiral dehumidification filter unit.
The main labels are as follows:
1-fixed supporting unit, 11-base, 12-measuring module 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 module, 31-high voltage measuring module, 32-low voltage measuring module;
4-liquid discharge electromagnetic 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;
7-high and low pressure switching valve.
Detailed Description
The gas pressure interface device of the present invention will be described in detail below with reference to specific embodiments and the accompanying drawings.
The gas pressure interface device is mainly used for detecting the input gas pressure, providing a gas output interface for connecting a detected pressure instrument and inputting pressure gas into the detected pressure instrument to realize the detection of the detected pressure instrument. The gas pressure interface device of the invention is designed in a modular structure, and comprises a fixed supporting unit 1, a gas pipeline unit 2 arranged in the fixed supporting unit 1, a measuring module 3 arranged on the fixed supporting unit 1, a spiral dehumidifying and filtering unit 5 and an interface unit 6, wherein:
referring to fig. 1 and 2, in this embodiment, the fixed supporting unit 1 includes a base 11, a measuring module base 12, a supporting plate 13, and an interface mounting base 14, the spiral dehumidifying filter unit 5 is fixed on the base 11, the measuring module 3 is mounted at a side of the measuring module base 12, and the interface unit 6 is disposed on the base 11 and the interface mounting base 14; the supporting plate 13 is located at the joint of the base 11 and the bottom of the measuring module seat 12, and the base and the measuring module seat are connected together by means of screw fixation or welding.
As shown in fig. 3, 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 module base 12, a high-pressure measuring pipeline 22 and a low-pressure measuring pipeline 23 disposed on the measuring module base 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 module 3, the spiral dehumidifying and filtering unit 5 and the interface unit 6 of the gas pressure interface device of the present invention form a gas circuit connection through each gas pipeline of the gas pipeline unit 2, and please refer to the following description for the specific connection condition.
Referring to fig. 1 to 5, 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 pipeline 25, and the output interface 62 is disposed on the interface mounting seat 14 and communicated with the gas output pipeline 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. 2 and 4, in this embodiment, two measurement modules 3, namely a high-pressure measurement module 31 and a low-pressure measurement module 32, are provided and mounted on the side of the measurement module base 12, preferably, fixed to the measurement module base 12 by non-removable screws; the measuring module 3 is exposed outside the fixed supporting unit 1, and the measuring modules with different measuring ranges and different accuracies can be replaced conveniently according to the detection requirement. The high-pressure measuring module 31 and the low-pressure measuring module 32 can be selected from commonly used detecting module models in the market, the high-pressure measuring module and the low-pressure measuring module have different detecting ranges and detecting accuracies, and generally, the gas pressure detecting range of the low-pressure measuring module 32 is small, and the detecting accuracy is high. The high-pressure measuring module 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 module 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 7 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 7 and the liquid discharge solenoid valve 4 are both normally closed two-way solenoid valves, and have two working states, i.e. power-on communication and power-off disconnection. 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 testing instrument through the interface device. Referring to fig. 6, 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 cylindrical cylinder with a cavity, and is mounted on the base 11, and a spiral groove 511 is formed on the inner wall of the cylindrical cylinder, and extends upwards from the bottom; the central vent pipe 52 is a hollow pipe with two open ends, and is fixed on the base 11, the bottom of the central vent pipe is communicated with the main gas pipeline 21, and the top of the central vent pipe passes through the bottom of the liquid storage cylinder 51 and extends to the upper part of the liquid storage cylinder 51; an isolating umbrella 53 is arranged on the upper part of the central vent pipe 52, the middle part of the isolating umbrella 53 is hermetically buckled with the upper end of the central vent pipe 52, a lateral through hole 531 is arranged on one side of the isolating umbrella 53, the interior 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 isolating umbrella 53 and the inner wall of the liquid storage cylinder 51.
One end of the gas output pipeline 26 is arranged on the bottom 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 521 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 liquid accumulation is left at the bottom of the liquid storage cylinder 51 due to the pressure gas 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 measuring module 31 and the low-pressure measuring module 32 can be switched by controlling the high-pressure and low-pressure switching valve 3, namely, the high-pressure and low-pressure switching valve 7 is closed when high pressure is measured, the high-pressure measuring port of the high-pressure measuring module 31 is communicated with the gas main pipeline 21 and the gas input pipeline 25, and the high-pressure measuring module 31 works independently; when measuring low pressure (generally, the required measurement precision is relatively high, and the high-pressure measurement module 31 cannot meet the requirement), the high-low pressure switching valve 7 is opened, the high-pressure measurement port of the high-pressure measurement module 31 and the low-pressure measurement port of the low-pressure measurement module 32 are both communicated with the gas main pipe 21 and the gas input pipe 25, the high-pressure measurement module 31 and the low-pressure measurement module 32 work, and the measurement result is based on the low-pressure measurement module 32 with high precision.
The automatic and orderly control of the device needs to electrically connect the high-pressure measuring module 31, the low-pressure measuring module 32, the high-low pressure switching valve 7 and the liquid discharge electromagnetic valve 4 to a control circuit board, and the control circuit board controls the action of each electromagnetic valve according to a preset control time sequence and receives the detection data of the measuring module.
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 within the scope of the inventive concept, many variations and modifications may be made to the structure of the inventive device, for example, the number of the measuring modules 3 is not limited to two, and may be one or more; the installation of the measuring module 3 is not limited to the side surface of the measuring module seat 12, and can be flexibly arranged according to the space requirement and the structural shape; the high-low pressure switching valve 3 can be a three-way electromagnetic valve, a high pressure measuring pipeline (22) is connected with a normally closed end of the three-way electromagnetic valve, a low pressure measuring pipeline (23) is connected with a common end of the three-way electromagnetic valve, a normally opened end of the three-way electromagnetic valve is communicated with the atmosphere, the three-way electromagnetic valve is not electrified when measuring high pressure, a high pressure measuring port of a high pressure measuring module 31 is communicated with a gas main pipeline 21 and a gas input pipeline 25, and a low pressure measuring port of a low pressure measuring module 32 is communicated with the atmosphere, so that the low pressure measuring module 32 can be prevented; when measuring low pressure, the three-way electromagnetic valve is electrified, the normally open end is disconnected with the public end, the normally closed end is connected with the public end, and the low-pressure measuring port of the low-pressure measuring module 32 and the high-pressure measuring port of the high-pressure measuring module 31 are both communicated with the gas main pipeline 21 and the gas input pipeline 25.
The gas pressure interface device adopts a modular design, can replace a proper measuring module 3 according to the measuring range and the precision of a detected pressure instrument, or switch between a high-pressure measuring module 31 and a low-pressure measuring module 32 by controlling a high-low pressure switching valve 7, has good adaptability and ensures the detection 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 tested pressure instrument from entering the testing instrument through the interface device.
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. A gas pressure interface device, comprising: fixed supporting unit (1), gas pipeline unit (2), measuring module (3) and interface unit (6), still concatenate a spiral dehumidification filter unit (5) in gas pipeline unit (2), spiral dehumidification filter unit (5) include:
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 vent pipe (52) is communicated with a gas input pipeline (25) of the gas pipeline unit (2), and the top of the central vent 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 interface device according to claim 1, wherein the gas output pipe (26) in the gas piping unit (2) is provided at a bottom side of the reservoir (51) and communicates with the interior of the reservoir.
3. The gas pressure interface device according to claim 1 or 2, wherein one end of the liquid discharge pipe (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, and the liquid discharge pipe (24) is connected with a liquid discharge electromagnetic valve (4) in series.
4. Gas pressure interface device according to one of claims 1 to 3, characterized in that the stationary support unit (1) comprises a base (11) and a measuring module base (12), the bottom connections of the base (11) and the measuring module base (12) being connected together by a support plate (13).
5. The gas pressure interface device according to any one of claims 1 to 4, wherein one or more measurement modules (3) are provided, and the measurement modules (3) are mounted on the side of the measurement module base (12) and exposed.
6. Gas pressure interface device according to one of claims 1 to 5, 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).
7. The gas pressure interface device according to claim 6, characterized in that the high-low pressure switching valve (7) is a two-way normally closed solenoid valve.
8. The gas pressure interface device according to claim 6, wherein the high-low pressure switching valve (7) is a three-way solenoid valve, the high pressure measuring pipe (22) is connected to a normally closed end of the three-way solenoid valve, the low pressure measuring pipe (23) is connected to a common end of the three-way solenoid valve, and a normally open end of the three-way solenoid valve is communicated with the atmosphere.
9. The gas pressure interface device according to any one of claims 4 to 8, the gas pipeline unit (2) is arranged in the fixed supporting unit (1), and comprises a gas main pipeline (21) which horizontally penetrates through a base (11) and a measuring module seat (12), a high-pressure measuring pipeline (22) and a low-pressure measuring pipeline (23) which are arranged on the measuring module seat (12), a liquid drainage pipeline (24) which is independently arranged with the gas main pipeline (21), a gas input pipeline (25) and a gas output pipeline (26), wherein the high-pressure measuring pipeline (22) is respectively communicated with the gas main pipeline (21), the low-pressure measuring pipeline (23) is communicated with the gas main pipeline through a high-low pressure switching valve (7), and the gas output pipeline (26) is communicated with the gas main pipeline (21) through a spiral dehumidifying and filtering unit (5).
10. Gas pressure interface device according to any one of claims 4 to 9, characterized in that said interface unit (6) comprises an input interface (61), an output interface (62), a drain (63) and an exhaust gas inlet (64), the input interface (61) being arranged on the base (11) and communicating with the gas input duct (25), the output interface (62) communicating 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).
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