CN210035087U - Pipeline pressure measuring device - Google Patents

Abstract

The utility model provides a pipeline pressure measuring device, this pipeline pressure measuring device install wait to detect on the pipeline, or install on the trip valve, pipeline pressure measuring device includes: the shell comprises a connecting part and an air guide structure which are connected with each other, the connecting part is connected with the pipeline to be detected or the cut-off valve, and the air guide structure is communicated with the pipeline to be detected; the pressure sensing module is hermetically arranged in the air guide structure and used for measuring pressure parameters in the pipeline in real time; the controller is respectively connected with the pressure sensing module and the cut-off valve and is used for receiving the pressure parameters detected by the pressure sensing module, sending an alarm signal when the pressure parameters are lower than a set value and triggering and controlling the cut-off valve to be closed; and the mounting cap is mounted on the air guide structure and seals the air guide structure.

Description

Pipeline pressure measuring device

Technical Field

The utility model relates to a pipeline pressure measurement device and method, especially a pipeline pressure measurement device who has the pressure detection function, has pressure anomaly alarm and closes the valve function simultaneously.

Background

The emergency cut-off valve for the gas pipeline is a vital linkage device in a gas safety control system, hundreds of gas valve manufacturers exist in the national market at present, and the gas cut-off valves with various calibers for household production, industry and commerce are produced, but the basic functions and the principle of the gas valves are not improved all the time, and the cut-off or conduction function of the valves can only be realized.

The gas cut-off valve widely used at present can only realize the function of alarm cut-off, so the valve is always in a conducting state after being installed. Once the gas pipeline leaks, the pipeline can be cut off only after the alarm gives an alarm and sends a valve cutting signal. The valve with detection alarming function of prior art when using the gas, just opens the valve after guaranteeing that the pipeline does not have the leakage through controlling means at first carrying out the pipeline gas tightness inspection, carries out the air feed. When the valve is not used, the valve is closed through the control device, the air tightness check is carried out again, and the rear end of the valve cannot leak air any more. The use of this kind of valve has promoted gas security level greatly.

The prior art valve can be divided into 10 products with different calibers from DN15 to DN300, and if the function of measuring the pressure of the pipeline is realized, an air guide hole needs to be added on the prior structure, and a pressure measuring circuit is added, which leads the prior electromagnetic valve to be redesigned. The products are generally metal castings, and the die equipment is expensive, so that huge capital investment is inevitably caused. Meanwhile, the solenoid valves in use on the market must be purchased and installed again if necessary to realize the function, which is a great expense for users.

The electromagnetic valve parts are mostly made of materials such as machinery, rubber and the like, and if the materials are reliable in quality and scientific in process control, the service life of the electromagnetic valve can be generally up to decades, so that the service life of the electromagnetic valve is generally promised to be more than 10 years. However, as the service life of the electronic device is prolonged, the probability of failure of the electronic device is gradually increased, and the product failure phenomenon also frequently occurs, so that the problem of maintenance and replacement of the pressure measurement component needs to be considered.

Therefore, how to design a device which is matched with the existing electromagnetic valve and realizes pipeline pressure measurement is a problem to be solved urgently in the current valve manufacturers and engineering fields.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to the above-mentioned problem of prior art, provide one kind and have the pressure detection function, have the unusual warning of pressure and close the pipeline pressure measurement device of valve function simultaneously.

In order to achieve the above object, the utility model provides a pipeline pressure measuring device installs and waits to detect on the pipeline, or installs on the trip valve, wherein, pipeline pressure measuring device includes:

the shell comprises a connecting part and an air guide structure which are connected with each other, the connecting part is connected with the pipeline to be detected or the cut-off valve, and the air guide structure is communicated with the pipeline to be detected;

the pressure sensing module is hermetically arranged in the air guide structure and is used for measuring pressure parameters in the pipeline in real time;

the controller is respectively connected with the pressure sensing module and the cut-off valve, receives the pressure parameter detected by the pressure sensing module, sends out an alarm signal when the pressure parameter is lower than a set value, and triggers and controls to close the cut-off valve; and

and the mounting cap is mounted on the air guide structure and seals the air guide structure.

The pressure measuring device for the pipeline is characterized in that the air guide structure is an air collecting cavity, the air collecting cavity and the connecting part are integrated, an installation part is arranged in the air collecting cavity, the pressure sensing module is installed on the installation part, and a sealing material is arranged between the pressure sensing module and the installation part.

In the above pipeline pressure measuring device, the connecting portion is a pipeline connecting port adapted to the pipeline to be detected, and the axis of the air collecting cavity is perpendicular to the axis of the pipeline connecting port.

The pressure sensing module is connected with the boss face in a sealing mode through a sealing ring, explosion-proof cement or sealing resin.

The above-mentioned pressure measuring device for a pipeline, wherein the air guide structure comprises a pressure sensing module mounting part and an air guide hole, and the air guide hole is arranged at the joint of the pressure sensing module mounting part and the connecting part.

In the above pipe pressure measuring device, the pressure sensing module is a pressure sensor or a membrane tact switch.

The pipeline pressure measuring device is arranged on the pipeline to be detected, the connecting portion comprises two pipeline connecting ports, the two pipeline connecting ports are coaxially arranged, and the pipeline connecting ports are in threaded connection or flange connection with the pipeline to be detected.

The pipeline pressure measuring device is arranged on the stop valve, the connecting portion comprises a gas connecting port, and the gas connecting port is in threaded connection or flange connection with the stop valve.

In the above pipe pressure measuring device, the pressure sensing module includes a pressure detecting unit and a pressure analyzing unit, the pressure detecting unit converts a pressure signal into an electrical signal and transmits the electrical signal to the pressure analyzing unit, and the pressure analyzing unit performs pressure analysis on the electrical signal to obtain the pressure parameter and outputs the pressure parameter to the controller.

The technical effects of the utility model reside in that:

the utility model discloses supporting valve and pressure measurement, not changing current valve, having pressure anomaly and reporting to the police and the valve function of closing when having the pressure measurement function, for prior art, manufacturing and construction are all simple and easy. Additionally, the utility model is used for when reforming transform current pipeline, need not to change current solenoid valve, can realize leaking the warning through detection pressure, improve the security level greatly, reduce installation and maintenance cost.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.

Drawings

Fig. 1 is a schematic structural view of a pipeline pressure measuring device according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a pipeline pressure measuring device according to another embodiment of the present invention;

fig. 3 is a schematic structural diagram of a pressure sensing module according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a pressure sensing module according to another embodiment of the present invention;

fig. 5 is an installation diagram of an embodiment of the present invention;

fig. 6 is a schematic view of the installation of another embodiment of the present invention;

fig. 7 is a schematic view of an installation according to another embodiment of the present invention.

Wherein the reference numerals

1 pipeline to be detected

2 cut-off valve

3 pipeline pressure measuring device

31 shell

311 gas collecting cavity

312 mounting part

313 seal

314 set screw

315 air inlet

316 sensor mounting port

317 connecting part

318 deformable air bag

319 air guide hole

32 pressure sensing module

321 pressure detecting unit

322 pressure analysis unit

33 controller

34 mounting cap

35 connecting line

Detailed Description

The following describes the structural and operational principles of the present invention in detail with reference to the accompanying drawings:

referring to fig. 1 and fig. 2, fig. 1 is a schematic structural view of a pipeline pressure measuring device according to an embodiment of the present invention, and fig. 2 is a schematic structural view of a pipeline pressure measuring device according to another embodiment of the present invention. Fig. 1 shows a line pressure measuring device 3 having two connection ports (double ports), and fig. 2 shows the line pressure measuring device 3 having one connection port. The utility model discloses a pipeline pressure measurement device 3 for measure gas pipeline internal pressure, the mountable is waiting to detect on pipeline 1 (as shown in fig. 5 and fig. 6), or install on trip valve 2 on the shell of the first class gas equipment or built-in to this kind of equipment (as shown in fig. 7), this pipeline pressure measurement device 3 has multiple different structural style, and it utilizes the air guide pipeline with the pipeline in the gas guide to the pressure sensing module 32 on, accomplish by pressure sensing module 32 and detect and export the result. Can be installed on pipelines with different shapes, such as a straight-through type, an elbow type and the like; different connection modes can be adopted for connecting the pipeline, including external threads, internal threads, flanges or interference fit modes and the like; the housing 31 may be made of various metal materials including aluminum, copper, stainless steel, etc. The automatic cut-off valve is used together with a cut-off valve 2 with an electric control switch function, and the cut-off valve 2 can be an electromagnetic type emergency cut-off valve and also can be a ball valve cut-off valve. The pipe pressure measuring device 3 includes: the housing 31 includes a connecting portion 317 and an air guide structure connected to each other, wherein the air guide structure is a part of the housing 31, and the air guide structure may be a through hole, or other pressure-conductive liquid/membrane, etc. for guiding air to the pressure sensor for detection by the pressure sensor. For example, the gas guiding structure may be a gas collecting cavity 311, or may be only one gas guiding hole 319, and a gas inlet 315 is disposed at a joint of a lower end of the gas collecting cavity 311 and the connecting portion 317, and is used for introducing the gas to be detected from the outside onto the pressure detecting surface of the pressure sensing module 32, so that the pressure detecting component can measure the pressure. The upper wall of the air collection cavity 311 has a mounting portion 312 for mounting the pressure sensing module 32, and the mounting portion 312 is sealed with air by a sealing material such as a gasket or a sealing ring. The top end of the sensor mounting port 316 is provided with a mounting cap 34 with a through hole in the middle, and the pressure sensing module 32 is mounted and then the mounting cap 34 is screwed on, so that the assembly is completed. In another embodiment of the present invention, the air guide structure includes a pressure sensing module mounting portion and an air guide hole 319, the air guide hole 319 is disposed in the pressure sensing module mounting portion and the joint of the connecting portion 317, the air guide hole 319 is used for guiding the gas to be detected from the outside to the pressure detection surface of the pressure sensing module 32, for the pressure detection part of the pressure sensing module 32 to measure the pressure. The connecting part 317 is connected with the pipeline 1 to be detected or the cut-off valve 2, and the air guide structure is communicated with the pipeline 1 to be detected; the pressure sensing module 32 is hermetically arranged in the air guide structure through a sealing element 313 and is used for measuring pressure parameters in the pipeline in real time; the controller 33 is respectively connected with the pressure sensing module 32 and the cut-off valve 2, and is used for receiving the pressure parameter detected by the pressure sensing module 32, sending an alarm signal when the pressure parameter is lower than a set value, and triggering and controlling the cut-off valve 2 to be closed; and a mounting cap 34 mounted on and sealing the air guide structure. The mounting cap 34 can be opened and the pressure sensing module 32 replaced very easily with a special tool.

As shown in fig. 1 and 2, the connecting portion 317 of the pressure casing 31 has a screw thread or flange connection interface, and can be connected to the gas pipeline or the valve casing of the shut-off valve 2 at one end, or connected to both ends of the gas pipeline respectively, and is present as a gas transmission channel. After installation, gas is passed from one end of the gas line through connection 317 into the housing 31. The pressure sensing module 32 can measure the pressure parameter in the pipeline in real time. When the pressure parameter in the pipeline is lower than the set value, an alarm signal is sent out, and the controller 33 is triggered to control the gas valve to be cut off. The pressure sensing module 32 is tightly matched with the mounting hole of the gas collecting cavity 311, and can be tightly pressed by the mounting cap 34 after being mounted, so that the gas tightness of the gas pipeline is ensured. When the pressure sensing module 32 is replaced, the valve of the front-end pipeline cut-off valve 2 is firstly closed, corresponding pressure detection is carried out after the pressure sensing module 32 is replaced, and normal air supply can be carried out after the pressure sensing module is qualified.

In this embodiment, the gas guide structure is preferably a gas collection cavity 311, the gas collection cavity 311 and the connection portion 317 are an integral structure, an installation portion 312 is disposed in the gas collection cavity 311, the pressure sensing module 32 is installed on the installation portion 312, and a sealing member 313 is disposed between the pressure sensing module 32 and the installation portion 312 to realize gas sealing. The pipeline pressure measuring device 3 can be divided into a double-port structure and a single-port structure according to different installation positions of the pipeline 1 to be detected, and the single-port structure can comprise an external installation structure and an internal installation structure. When the pipeline pressure measuring device 3 is mounted on the pipeline 1 to be detected by adopting a double-port structure, referring to fig. 5, the connecting part 317 comprises two pipeline connecting ports, the shell is further provided with a sensor mounting port 316, and the two pipeline connecting ports are connected to the pipeline or other equipment and used for transmitting fuel gas; the two pipeline connectors are coaxially arranged, the pipeline connectors are in threaded connection or flange connection with the pipeline 1 to be detected, the connecting portion 317 is the pipeline connector matched with the pipeline 1 to be detected, and the axis of the gas collection cavity 311 is perpendicular to the axis of the pipeline connectors. When the pipe pressure measuring device 3 is mounted on the valve body of the shut-off valve 2, the connecting portion 317 includes a gas connection port, and the housing 31 is further provided with a sensor mounting port 316, and at this time, the gas is introduced through the gas inlet 315, and this mounting manner does not affect the transmission of the gas, so that only one gas connection port is required. Wherein, the gas collecting cavity 311 is preferably a cylindrical structure, the mounting portion 312 is located on a boss surface of the inner wall of the gas collecting cavity 311, the pressure sensing module 32 is connected with the boss surface in a sealing manner through a sealing element 313 such as a sealing ring, an explosion-proof cement or a sealing resin, and can also be sealed after being fixed through a fixing screw 314.

Referring to fig. 3 and fig. 4, fig. 3 is a schematic structural diagram of a pressure sensing module (adopting a deformable cavity) according to an embodiment of the present invention, and fig. 4 is a schematic structural diagram of a pressure sensing module (adopting a pressure sensor) according to another embodiment of the present invention. The pressure sensing module 32 may be a pressure sensor or a membrane tact switch according to the pressure detection manner. And modes such as a pressure sensor, an analog resistor, a contact switch and the like can be adopted according to different detection principles. The pressure sensor is a sensor specially used for measuring the pressure, and can directly convert a pressure signal into an identifiable electric signal and output the signal. Other types of pressure sensing devices, whose principle is that a change in pressure causes a change in electrical signal, such as that shown in fig. 3, achieve the purpose of measuring the pressure by changing the volume of the cavity of the deformable air bag 318, or by changing the position/length of other components, such as the spring/link. The pressure sensing module 32 may include a pressure detecting unit 321 and a pressure analyzing unit 322, where the pressure detecting unit 321 is configured to convert a pressure signal into an electrical signal and transmit the electrical signal to the pressure analyzing unit 322, and the pressure analyzing unit 322 performs pressure analysis on the electrical signal to obtain the pressure parameter, and outputs the pressure parameter to the controller 33. The pressure detection unit 321 and the pressure analysis unit 322 are powered by the connection line 35, both of which are installed in the housing 31, and the pressure sensing module 32 has a sealing ring on the outer wall thereof, which may surround the outer wall of the pressure sensor or be located at the bottom of the pressure sensor. And is tightly connected with the outer wall of the gas collecting cavity body 311 through a sealing member 313 at the outer part or the lower part of the pressure sensing module 32. The utility model discloses can adopt multiple method to realize the pressure detection function, the preferred pressure sensor who adopts the electronic type, this type of sensor adopts the change of silicon chip measurement gas pressure, and the precision is high, and the installation is easy, and the uniformity is good. The function can also be realized by adopting a diaphragm and a travel switch, and the principle is that the travel switch is pushed to move when the pressure of the diaphragm changes, and the motion of the travel switch can generate different states. Its advantages are simple principle and low cost. But cannot measure the exact value of pressure or can only achieve the measurement of the pressure value at individual points. Can be selected according to different requirements. The pressure signal output mode is related to the detection principle, and generally can output a digital signal, an analog signal or a simple state signal. When the pressure sensor is used, the pressure sensor comprises digital signals and analog signal output, the output signals can be easily identified by an external circuit and can acquire pressure values, and if a pressure alarm state is set, abnormal state signals of the pressure can be acquired. The signal transmission and self power supply of the pressure sensing module 32 can be connected in a wired manner, and a set of connecting wires 35 can be provided, the built-in pressure sensing module 32 is powered through the connecting wires 35, and meanwhile, the pressure state or data is transmitted to the controller 33, and the controller 33 is responsible for power supply and data acquisition. When the pressure sensing module 32 is assembled inside the housing 31, the sealing ring on the outer wall of the pressure sensing module 32 is pressed against the outer side surface of the outer wall of the gas collecting cavity 311 (the pressing mode can be realized by using the fixing screw 314, the gas pressing hoop, or the like, or the mounting cap 34 as the gas pressing hoop), and the sealing ring can achieve the effect of gas sealing. When the deformable air bag 318 is adopted, the cavity of the deformable air bag 318 can be directly used as a sealing material for compression sealing after being deformed, or a sealing ring is added to achieve the purpose of gas sealing. The pressure sensing module 32 has a built-in data analysis function, can easily realize real-time pressure detection or pressure change model building through technologies such as a single chip microcomputer, can acquire the change state and the change quantity value of gas pressure through data analysis, and outputs a warning signal when the pressure change exceeds a set value.

Referring to fig. 5-7, fig. 5 is an installation schematic diagram of an embodiment of the present invention, fig. 6 is an installation schematic diagram of another embodiment of the present invention, and fig. 7 is an installation schematic diagram of another embodiment of the present invention. Fig. 5 is a schematic view showing the installation of the pipe pressure measuring device 3 having two pipe connection ports. Fig. 6 is a schematic view of the pipe pressure measuring device 3 having one gas connection port when it is mounted on a pipe. Fig. 7 is a schematic view showing the installation of the line pressure measuring device 3 having one gas connection port to the valve. The pipe pressure measuring device 3 may be mounted to the gas line or to the inside or outside of the shut-off valve 2. When installed on a gas pipeline, the device can be in a double-port or single-port mode, and as shown in fig. 5, a double-port structure can be directly installed in the pipeline and exists as a section of the pipeline. As shown in figure 6, the single-port structure can be directly screwed on the pipeline in a screw thread mode, and a mounting hole with a proper size is formed in the corresponding position on the pipeline and used for guiding gas and fixing the device, so that the pressure of the gas is monitored while the gas is conveyed through the pipeline. Or one end of the pressure measuring device is installed at the air outlet end of pipeline equipment such as the cut-off valve 2 by adopting a screw thread or a flange plate, and the other end of the pressure measuring device is connected to the pipeline, as shown in fig. 7, the pipeline pressure measuring device 3 is installed on the cut-off valve 2, the connecting part 317 comprises a gas connecting port, and the gas connecting port is in threaded connection or flange connection with the shell of the cut-off valve 2. When installing inside trip valve 2 or outside, similar the mode of installing on the pipeline, when adopting single mouthful structure, correspond the trompil on the valve of trip valve 2 for the air guide with fixed this equipment.

According to the different of supporting pipeline bore, the utility model discloses can have different specification and size, from DN15 to DN 300. The structure is much simpler than that of electromagnetic valves, so that the valve is easy to manufacture. A mounting port is provided in the vent line and communicates with the interior of the line to enable the pressure sensing module 32 to effectively sense the pressure of the gas in the line. The sensing component of the pressure sensing module 32 should be in direct contact with the pipeline gas, and the pressure sensing module 32 also has a sealing function to effectively isolate the gas in the pipeline from the outside gas. There are many ways to realize gas detection and isolation, and in this embodiment, the pressure sensing module 32 is preferably a cylinder, as shown in fig. 5, the pressure detecting unit 321 is disposed on the lowest surface of the cylinder, and the pressure detecting unit 321 may be a diaphragm or a conductive medium. An O-shaped ring is arranged at the waist part of the cylinder body and used for sealing. When the installation structure is used, a structure boss which is larger than the diameter of the cylinder but smaller than the diameter of the O-shaped ring is arranged at the corresponding position of the installation hole. The purpose of sealing is achieved through the matching and pressing of the O-shaped ring and the boss. The pressure for pressing the cylinder can come from the mounting cap 34, and a fixing fitting can be additionally added. In addition to sealing with O-rings, a wide variety of materials may be used, including explosion-proof mastics, resins, and the like.

When the pressure-sensitive gas collecting device is used, gas with certain gas pressure reaches the gas collecting cavity 311 through the gas guide hole 319, the pressure sensitive element measures the gas pressure of the gas in the gas collecting cavity 311, and a pressure value and working state information are obtained through analysis. For example, if the gas is not used after the valve of the shut-off valve 2 is closed, the pressure in the pipeline should be in a stable state for a certain time, and if a gas pressure drop is detected in such a state, it can be considered that the gas pipeline has a leak. The pressure analysis unit 322 can send out an abnormal prompt according to the magnitude of the leakage amount, and meanwhile, the pressure analysis unit 322 can receive a correction index sent from the outside so as to improve the accuracy and the application range of the algorithm. The calculated pressure value and the analyzed status information are transmitted to the controller 33 through the connection line 35, and the controller 33 performs an abnormality process, such as closing a valve and issuing an alarm, according to the set abnormality alarm threshold.

The pipeline pressure measuring device 3 can provide pressure data measurement and output, and can provide pressure abnormal state judgment and output. The device is connected with the controller 33 by a wired mode, power is supplied to the controller 33 through a connecting line 35, and detected data or states are uploaded to the controller 33 by a wired communication mode. The power supply is a low-voltage direct-current power supply, the communication mode can be 485 communication, 4-20mA communication or other wired communication modes, and the data flow direction comprises an active control signal of the controller 33 and a state reporting signal of the pressure sensing module 32. Meanwhile, the calibration command or the calibration signal sent by the controller 33 can be received, so that the data analysis precision and the use of different applicable scenes are improved. The controller 33, as a general coordination unit of the system, controls the opening and closing of the front end shut-off valve 2 by acquiring the data and status of the pressure sensing module 32.

The utility model discloses with the supporting use of valve that has automatically controlled switch, the function of closing, should install 2 low reaches of trip valve, guarantee to close the gas pressure change in 2 low reaches of valve back detectable trip valve. And the same controller 33 as the shut-off valve 2 is connected, and the controller 33 coordinates the whole system. After the controller 33 closes the valve, it can determine whether there is a pressure change at the rear end of the pipeline by sampling the pressure information output by the pressure sensing module 32, and finally achieve the purpose of detecting the pipeline leakage. The controller 33 generally coordinates the signals and controls of the pressure sensing module 32 and the shut-off valve 2, so that a product with higher safety level can be realized.

Because direct contact gas is involved, the prior art needs to adopt ways such as encapsulating to seal. Its sealed effect is fine, but if need change after the product encapsulating, then must whole product all tear open, this often need destroy the gas pipeline in actual work progress, and gas pipeline engineering must be operated by professional because relate to gas safety and explosion-proof to can use after carrying out strict safety inspection, it relates to that time limit for a project, manpower and materials all is comparatively huge. The utility model discloses a generally be difficult to damage after the shell installation, also need not to change. Because the pressure sensing module 32 contains electronic components, the pressure sensing module may need to be replaced many times due to damage caused by aging, dirt and moisture of the sensing components, and the built-in pressure sensing module 32 can be replaced on site conveniently. The internal pressure sensing module 32 and the shell 31 are tightly pressed and sealed by elastic elements such as rubber rings and sealing gaskets through screws, pipe hoops and the like, and the pressure sensing module 32 can be disassembled by disassembling screw elements such as screws or pipe hoops without damaging the original structure of the pipeline.

The utility model discloses with valve and pressure detection separation, can not change current valve structure, for prior art, manufacturing and construction are all simple and easy. The cost of the replacement of the parts can be reduced, the difficulty of the field replacement of workers is reduced, the labor efficiency is improved, and the purposes of reducing the cost and improving the safety are finally achieved. When the existing pipeline is reconstructed, the existing electromagnetic valve is not required to be replaced, the leakage alarm can be realized by detecting the pressure, and the safety level is greatly improved.

Naturally, the present invention can be embodied in many other forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit or essential attributes thereof, and it is intended that all such changes and modifications be considered as within the scope of the appended claims.

Claims (9)

1. The utility model provides a pipeline pressure measuring device, installs and waits to detect on the pipeline, or install on the trip valve, its characterized in that, pipeline pressure measuring device includes:

the shell comprises a connecting part and an air guide structure which are connected with each other, the connecting part is connected with the pipeline to be detected or the cut-off valve, and the air guide structure is communicated with the pipeline to be detected;

the pressure sensing module is hermetically arranged in the air guide structure and is used for measuring pressure parameters in the pipeline in real time;

the controller is respectively connected with the pressure sensing module and the cut-off valve, receives the pressure parameter detected by the pressure sensing module, sends out an alarm signal when the pressure parameter is lower than a set value, and triggers and controls to close the cut-off valve; and

and the mounting cap is mounted on the air guide structure and seals the air guide structure.

2. The pressure measuring device according to claim 1, wherein the air guide structure is an air collecting cavity, the air collecting cavity and the connecting portion are an integral structure, an installation portion is arranged in the air collecting cavity, the pressure sensing module is installed on the installation portion, and a sealing material is arranged between the pressure sensing module and the installation portion.

3. The pipe pressure measuring device according to claim 2, wherein the connecting portion is a pipe connecting port adapted to the pipe to be tested, and an axis of the gas collecting cavity is perpendicular to an axis of the pipe connecting port.

4. The pipe pressure measuring device according to claim 2, wherein the gas collecting cavity has a cylindrical structure, the mounting portion is a boss surface located on an inner wall of the gas collecting cavity, and the pressure sensing module is connected with the boss surface in a sealing manner through a sealing ring, an explosion-proof cement or a sealing resin.

5. The pressure measuring device according to claim 1, wherein the air guide structure includes a pressure sensing module mounting portion and an air guide hole provided at a junction of the pressure sensing module mounting portion and the connection portion.

6. The pressure measuring device according to claim 1, 2, 3, 4 or 5, wherein the pressure sensing module is a pressure sensor or a membrane tact switch.

7. The pipe pressure measuring device according to claim 6, wherein the pipe pressure measuring device is mounted on a pipe to be detected, the connecting portion includes two pipe connecting ports, the two pipe connecting ports are coaxially arranged, and the pipe connecting ports are in threaded connection or flange connection with the pipe to be detected.

8. The pressure measuring device according to claim 6, wherein the pressure measuring device is mounted on a shut-off valve, and the connecting portion includes a gas connecting port, and the gas connecting port is in threaded connection or flange connection with the shut-off valve.

9. The pressure measuring device according to claim 6, wherein the pressure sensing module comprises a pressure detecting unit and a pressure analyzing unit, the pressure detecting unit converts a pressure signal into an electrical signal and transmits the electrical signal to the pressure analyzing unit, and the pressure analyzing unit performs pressure analysis on the electrical signal to obtain the pressure parameter and outputs the pressure parameter to the controller.

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