CN220137588U

CN220137588U - Pressure control device and pressure control system

Info

Publication number: CN220137588U
Application number: CN202321790780.5U
Authority: CN
Inventors: 张春莹; 刘新; 苏新安; 丁鹏宇; 程源; 张建敏
Original assignee: Beijing Const Instruments Technology Inc
Current assignee: Beijing Const Instruments Technology Inc
Priority date: 2023-07-07
Filing date: 2023-07-07
Publication date: 2023-12-05
Anticipated expiration: 2033-07-07

Abstract

The application provides a pressure control device and a pressure control system, wherein the pressure control device comprises a pressure output port, a pressure control module and a control module, the pressure output port is used for being communicated with a pressure instrument to be detected, the pressure control module is provided with a module output end, the module output end is communicated with the pressure output port through an output branch, the pressure control module is used for controlling a medium so as to adjust the pressure of the module output end, an isolation valve is arranged on the output branch, and in the pressure detection process, the isolation valve can be controlled to be in a closed state to isolate the module output end from the pressure output port, so that the pressure control device can form an independent pressure environment without detaching the pressure output port from the pressure control device, and the pressure self-detection efficiency is improved.

Description

Pressure control device and pressure control system

Technical Field

The application belongs to the technical field of pressure detection, and particularly relates to a pressure control device and a pressure control system.

Background

The pressure control device can output target pressure according to the user demand and is used for detecting detected pressure instruments such as a manometer, a pressure transmitter, a pressure switch and the like.

The pressure control device is communicated with the detected pressure instrument and the reference pressure instrument through the pressure connecting device, such as a pressure connecting table, and in the detection process, if the detected pressure instrument or the reference pressure instrument is found to have an abnormality in the measurement result, the pressure control device is required to be detached from the pressure connecting device, and independent pressure environments are respectively formed for detection, so that the problem source can be determined, the process is complex, and the working efficiency is low.

Disclosure of Invention

The utility model provides a pressure control device and a pressure control system, which can respectively detect a detected pressure instrument and the pressure control device under the state that the detected pressure instrument is not dismounted, and improve the working efficiency.

In a first aspect, the present utility model provides a pressure control device comprising: the pressure output port is used for communicating a pressure instrument to be detected; the pressure control module is provided with a module output end and is used for controlling the gas medium so as to adjust the pressure of the module output end, and the module output end is communicated with the pressure output port through an output branch; the output branch is provided with an isolation valve, if the pressure of the output end of the module is negative pressure, the isolation valve prevents the gas medium from moving towards the direction of the output end of the module in a closed state, so that the pressure of the output end of the module can be smaller than the pressure of the output end of the module, and if the pressure of the output end of the module is positive pressure, the isolation valve prevents the gas medium from moving towards the direction of the output end of the pressure in the closed state, so that the pressure of the output end of the module can be larger than the pressure of the output end of the pressure; and the control module is electrically connected with the isolation valve and used for controlling the opening and closing states of the isolation valve. Through set up the isolation valve on the output branch of accuse pressure module, can be when carrying out pressure detection, keep apart accuse pressure module and pressure output port, so, need not to separate pressure output port and accuse pressure module, can make accuse pressure module form independent pressure environment, improved pressure control device's self-checking efficiency.

In one possible embodiment, the module output is for outputting positive pressure, and the isolation valve comprises: the first isolation end is communicated with the pressure output port; the second isolation end is communicated with the module output end, and in the closed state of the isolation valve, the bearable positive pressure of the second isolation end is larger than that of the first isolation end;

alternatively, the module output is configured to output a negative pressure, and the isolation valve includes: the first isolation end is communicated with the pressure output port, the second isolation end is communicated with the module output end, and the negative pressure born by the second isolation end is smaller than that born by the first isolation end in the closing state of the isolation valve.

In one possible embodiment, the module output is for outputting positive pressure, and the isolation valve comprises: the third valve cavity is communicated with the output end of the module; a third valve block configured to be movable within a third valve chamber; the third valve hole is communicated with the pressure output port, when the isolating valve is in a closed state, the third valve block is sealed in the third valve hole, and the sealing force of the third valve block and the third valve hole is positively related to the relative pressure of the module output end and the pressure output port;

Alternatively, the module output is configured to output a negative pressure, and the isolation valve includes: the fourth valve cavity is used for communicating the pressure output port; a fourth valve block configured to be movable within a fourth valve chamber; and the fourth valve hole is communicated with the output end of the module, when the isolating valve is in a closed state, the fourth valve block is sealed in the fourth valve hole, and the sealing force of the fourth valve block and the fourth valve hole is positively related to the relative pressure of the output end of the module and the pressure output port.

In one possible embodiment, the isolation valve comprises: the third valve hole is communicated with the pressure output port; the fourth valve hole is communicated with the output end of the module; the fifth valve cavity is used for containing a gaseous medium, and the third valve hole and the fourth valve hole are respectively communicated with the fifth valve cavity; the third valve block is configured to be movable in the fifth valve cavity, and is pressed and sealed in the third valve hole when the isolating valve is in a closed state and the output pressure of the output end of the module is positive pressure; and the fourth valve block is configured to be movable in the fifth valve cavity, and is pressurized and sealed in the fourth valve hole when the output pressure of the output end of the module is negative and the isolating valve is in a closed state.

In a possible embodiment, the pressure control module comprises a pressure chamber for receiving a gaseous medium; the pressure control module is communicated with a pressure output port through an output branch and comprises: the pressure holding cavity is communicated with the output branch, and when the isolating valve is in a closed state, the output end of the module is communicated with the pressure holding cavity so as to form a space for detecting the pressure of the output end of the module.

In a possible implementation manner, the pressure control device further comprises a pressure measuring module, wherein the pressure measuring module is communicated with the pressure containing cavity through a measuring branch, and the inner diameter of the measuring branch is smaller than that of the pressure containing cavity, so that when the isolation valve is in a closed state, the pressure change of the measuring branch is smaller than or equal to that of the pressure containing cavity.

In one possible embodiment, the pressure measuring module comprises a first pressure measuring module and a second pressure measuring module, wherein the maximum value of the measuring range of the first pressure measuring module is larger than the maximum value of the measuring range of the second pressure measuring module, and/or the minimum value of the measuring range of the first pressure measuring module is smaller than the minimum value of the measuring range of the second pressure measuring module; the pressure measuring module is communicated with the pressure containing cavity through a measuring branch, and comprises a first pressure measuring module which is detachably communicated with a first measuring port, the first measuring port is communicated with the pressure containing cavity through a first measuring branch, and the inner diameter of the first measuring branch is smaller than the inner diameter of the pressure containing cavity; the second pressure measuring module is detachably communicated with the second measuring port, the second measuring port is communicated with the pressure containing cavity through the second measuring branch, the inner diameter of the second measuring branch is smaller than that of the pressure containing cavity, the second measuring branch is provided with a first stop valve, the first stop valve is used for controlling the on-off of the second measuring branch, and the control module is electrically connected with the first stop valve and used for controlling the opening and closing states of the first stop valve.

In a possible implementation manner, the pressure control device further comprises a pressure relief port, the pressure relief port is used for discharging a gas medium to the outside of the pressure control device, the pressure relief port is communicated with the pressure containing cavity through a pressure relief branch, a second stop valve is arranged on the pressure relief branch and used for controlling the on-off of the pressure relief branch, when the second stop valve is opened, the gas medium in the pressure containing cavity is discharged through the pressure relief branch, and the control module is electrically connected with the second stop valve and used for controlling the opening and closing states of the second stop valve; the inner diameter of the pressure relief branch is smaller than the inner diameter of the pressure containing cavity, so that when the isolation valve is in a closed state, the pressure change of the pressure relief branch is smaller than or equal to the pressure change of the pressure containing cavity;

the pressure holding cavity is provided with: the first port is communicated with the output end of the control module; the second port is communicated with the output branch; and the third port is communicated with the pressure relief branch, the position of the third port is lower than that of the first port, and the position of the third port is lower than that of the second port, so that when the second stop valve is opened, solid or liquid impurities in the gas medium are discharged through the pressure relief branch.

In a possible embodiment, the pressure control device is provided with an input port for communicating with the pneumatic medium supply device, and receiving the pneumatic medium output by the pneumatic medium supply device through the input port; the pressure control module comprises a pressure control branch, an input port is communicated with the pressure containing cavity through the pressure control branch, a pressure control valve is arranged on the pressure control branch and used for controlling pressure medium flowing through the pressure control branch, and the control module is electrically connected with the pressure control valve; the inner diameter of the pressure control branch is smaller than that of the pressure containing cavity.

In a second aspect, the present application provides a pressure control system comprising: the pressure connecting device is used for communicating a pressure instrument to be detected; any one of the pressure control devices comprises an isolation valve and a pressure output port, and the pressure output port is communicated with the pressure connecting device; and when the isolation valve is in a closed state, the measurement result of the reference pressure instrument is used for detecting the pressure of the pressure connecting device. Therefore, a pressure control system can be constructed through any one of the pressure control devices, so that when the pressure control system detects the pressure, the pressure environment is separated through the isolating valve, the number of times of separating the pressure control device from other devices is reduced, and the efficiency of pressure detection is improved.

As can be seen from the above technical solution, the present application provides a pressure control device, including a pressure output port, a pressure control module and a control module, where the pressure output port is used to communicate with a pressure meter to be tested, the pressure control module is provided with a module output port, the module output port is communicated with the pressure output port through an output branch, the pressure control module is used to control a medium so as to adjust the pressure of the module output port, and the output branch is provided with an isolation valve, in the pressure detection process, the isolation valve can be controlled to enter a closed state to isolate the module output port from the pressure output port, and because the isolation direction of the isolation valve is set, if the module output port outputs positive pressure, the module output port can generate positive pressure greater than the pressure output port, if the module output port outputs negative pressure, the module output port can generate negative pressure less than the pressure output port, so that the pressure control device does not need to be detached from the pressure output port, and the pressure control device can form an independent pressure environment, thereby improving the self-test efficiency of the pressure control device.

Drawings

In order to more clearly illustrate the technical solution of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic diagram of a pressure control device according to an embodiment of the present application;

FIG. 2 is a schematic diagram of an isolation valve according to an embodiment of the present application;

FIG. 3 is a second schematic diagram of an isolation valve according to an embodiment of the present application;

FIG. 4 is a third schematic diagram of an isolation valve according to an embodiment of the present application;

FIG. 5 is a schematic diagram of an isolation valve according to an embodiment of the present application;

FIG. 6 is a schematic diagram of an isolation valve according to an embodiment of the present application;

FIG. 7 is a schematic diagram showing piping connection of a pressure control device according to an embodiment of the present application;

FIG. 8 is a schematic diagram of a pressure chamber according to an embodiment of the present application;

FIG. 9 is a schematic view of an embodiment of a pressure control device;

FIG. 10 is a schematic front view of a pressure control device according to an embodiment of the present application;

fig. 11 is a schematic connection diagram of a control module according to an embodiment of the application.

Illustration of:

10-pressure output port; 20-a pressure control module; 30-a control module; 40-pressure measuring module; 50-a pressure relief port; 60-input port; 70-body;

21-module output; 22-an output branch; 23-a pressure vessel; 24-a pressure control branch; 41-measuring branch; 51-a pressure relief branch; 52-a second shut-off valve; 71-touching the display screen; 72-measuring a mounting bin; 73-a measurement protective cover;

210-isolation valve; 211-a first isolated end; 211' -a first isolated end; 212-a second isolated end; 212' -a second isolated end; 213-a third valve chamber; 213' -fourth valve chamber; 214-a third valve block; 214' -a fourth valve block; 215-a third valve hole; 215' -a fourth valve hole; 216-sealing rings; 217-fifth valve chamber; 218-a seal; 219-valve block; 231-first port; 232-a second port; 233-a third port; 241-pressure control valve; 410-a first pressure measurement module; 411-a first measurement port; 412-a first measurement branch; 420-a second pressure measurement module; 421-a second measurement port; 422-a second measurement branch; 430-first shut-off valve.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. Based on the embodiments of the present application, other embodiments that may be obtained by those of ordinary skill in the art without making any inventive effort are within the scope of the present application.

Hereinafter, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

Furthermore, in the present application, the terms "upper," "lower," "inner," "outer," and the like are defined relative to the orientation in which the components are schematically depicted in the drawings, and it should be understood that these directional terms are relative concepts, which are used for descriptive and clarity relative thereto, and which may be varied accordingly with respect to the orientation in which the components are depicted in the drawings.

Meanwhile, in order to facilitate the technical solution of the application, some concepts related to the present application will be described below first.

The gas pressure control device, which is a device for controlling pressure by taking gas as pressure medium, is applied to the pressure detection process. It should be understood that, in order to output the pressure medium, the pressure control device includes a pressure output port, and the pressure medium, after being controlled by the pressure control device, may reach the target pressure index and be output from the pressure output port, and in some embodiments of the present application, the pressure output by the pressure control device through the pressure output port is referred to as output pressure.

Further, the pressure output port of the pressure control device is required to be connected with the pressure connecting device, so that output pressure is distributed to each pressure-using device (for example, a detected pressure instrument and a reference pressure instrument) through a pressure transmission pipeline arranged in the pressure connecting device. The pressure control device and the pressure connection device may, for example, form a pressure system for supplying pressure medium to the pressure device.

In some examples, a reference pressure instrument can be further communicated with the pressure connecting device, the accuracy level of the reference pressure instrument is higher than that of the detected pressure instrument, the pressure output by the pressure output port of the pressure control device is accurately measured through the reference pressure instrument, and the obtained measured value can be used as a reference standard of the measured value of the detected pressure instrument.

In the related art, the pressure output ports of some pressure control devices are provided with isolation valves, which are used for preventing pressure medium from entering the pressure control devices from the pressure connection devices, so as to avoid the interference of the pressure in the pressure connection devices to the pressure control devices, for example, a plurality of pressure control devices with different measuring ranges are connected to the same pressure system, and when the pressure control device with higher measuring range pressure works, the isolation valves are arranged in order to avoid damage to the pressure control device with lower measuring range pressure.

In the embodiment of the application, the positive pressure is the pressure with the atmospheric pressure as the reference point and is greater than the atmospheric pressure, and the negative pressure is the pressure with the atmospheric pressure as the reference point and is less than the atmospheric pressure. It should be understood that the pressure level may be adjusted according to the amount of demand of the pressure using device, and the present application is not limited as to whether the pressure output from the pressure control device is positive or negative. The magnitude of the negative pressure in the present application is in accordance with the magnitude of the pressure value, for example-80 kPa is less than-60 kPa.

And a gas passage is formed between the communicating parties (at least two parties), and when the gas passage is opened, the gas pressure medium can pass through the gas passage, so that the gas pressure medium enters from one party to the other party. In some embodiments, the communication also includes the meaning that, in a normal state, the gas pressure medium does not leak from the communication position to objects other than the communicating parties.

And the stop valve is used for limiting the pressure medium to pass through the port or the branch corresponding to the stop valve, so that the pressure device with two or more pressure output ports is used for closing the unconnected output ports when the output ports are not fully occupied. Generally, the stop valve has a stop direction, and before the stop valve is installed, the relative pressure relation of the connection port needs to be determined, so that the stop valve can be installed correspondingly to normally function, and therefore, the stop directions are different, and the corresponding pressure systems and the technical problems solved by the corresponding pressure systems are also different.

In the working process of the pressure system, if pressure abnormality occurs at the pressure using equipment, for example, the pressure value of any one of the detected pressure instrument or the reference pressure instrument fluctuates greatly, the position where the problem actually occurs can be a pressure control device or a pressure connecting device, so after the pressure abnormality of the pressure using equipment is detected, the pressures of the pressure control device and the pressure connecting device are required to be detected respectively, and an abnormal result is obtained.

In some embodiments, when the pressure system needs to be detected by fault, the operation of each device needs to be stopped first, and the pressure control device, the pressure connecting device and the pressure using device are separated to form independent pressure detection environments respectively for detection. Although the method can determine the problem object, the method has great influence on the system operation, so that the overall working efficiency is reduced.

In order to solve the above problems, the present application provides a pressure control device, so that when the pressure at the pressure equipment is abnormal, the pressure environment of the pressure control device and the pressure connection device can be isolated by controlling the pressure control device without detaching the pressure control device and the pressure connection device, so as to form an independent pressure detection environment, thereby reducing the influence on the system connection and improving the detection efficiency.

Referring to fig. 1, a schematic structure of a pressure control device according to an embodiment of the application is shown. As shown in fig. 1, the pressure control device includes a pressure output port 10, a control module 20, and a control module 30. The pressure output port 10 is used for being connected with a pressure device such as a pressure meter to be tested through a pressure connecting device, in the embodiment of the application, one end of the pressure output port 10 is connected with the pressure control module 20, and the other end of the pressure output port is connected with the pressure connecting device, so that output pressure with corresponding pressure magnitude is provided for the pressure connecting device through the pressure control module 20 in the working process.

In the embodiment of the present application, the pressure control module 20 includes a module output end 21, where the module output end 21 is connected to the pressure output port 10 through an output branch 22, and the pressure control module 20 can control the gaseous medium to adjust the pressure of the module output end 21.

The output branch 22 is provided with an isolation valve 210, the isolation valve 210 has an opening state and a closing state, and when the isolation valve 210 is in the opening state, the isolation valve 210 and the output branch 22 can form a passage capable of passing through a gas medium; when the isolation valve 210 is in the closed state, if the pressure of the module output end 21 is negative, the isolation valve 210 can prevent the gas medium from moving towards the module output end 21, so that the pressure of the module output end 21 can be smaller than the pressure of the pressure output port 10; if the pressure at the module output 21 is positive, the isolation valve 210 can prevent the gaseous medium from moving in the direction of the pressure output port 10, so that the pressure at the module output 21 can be greater than the pressure at the pressure output port 10.

The control module 30 in the pressure control device is electrically connected to the isolation valve 210, and is used for controlling the open/close state of the isolation valve 210, and illustratively, when the pressure system operates normally, the control module 30 controls the isolation valve 210 to maintain the open state, and when the pressure of the pressure instrument to be detected or the reference pressure instrument is abnormal, the control module 30 controls the isolation valve 210 to be in the closed state, so that the pressure control device is isolated from the pressure connection device, and independent pressure detection environments are formed.

In the above embodiment, by providing the isolation valve 210 on the output branch 22 of the pressure control module 20, the pressure control module 20 can be isolated from the pressure output port 10 when pressure detection is performed, and the pressure control module 20 can form an independent pressure environment without detaching the pressure output port 10 from the pressure control module 20, so that self-checking of the pressure control device is facilitated, and the pressure detection efficiency is improved.

It should be understood that if the measuring range of the pressure control device covers positive pressure and negative pressure, the generated output pressure includes positive pressure and negative pressure (only one pressure is output at the same time), in this case, the isolation valve 210 applied in the embodiment of the present application may have a bidirectional isolation function, or may be configured with two unidirectional isolation valves with different isolation directions, so that, when the pressure is positive, the pressure environment of the pressure control device and the pressure environment of the pressure connection device are independent, and when the pressure is negative, the pressure environment of the pressure control device and the pressure environment of the pressure connection device are independent, so that the pressure detection of the pressure control device is facilitated; if the measuring range of the pressure control device does not contain positive pressure or self-checking is not needed in the positive pressure part, a one-way isolation valve corresponding to the positive pressure can be configured; if the range of the pressure control device does not contain negative pressure, or self-checking is not needed in the negative pressure part, a one-way isolation valve corresponding to the negative pressure can be configured.

Illustratively, when the module output 21 is configured to output positive pressure, referring to FIG. 2, the isolation valve 210 includes a first isolation end 211 and a second isolation end 212. Wherein the first isolation end 211 communicates with the pressure output port 10 and the second isolation end 212 communicates with the module output 21. In the open state of the isolation valve 210, the pressure medium can be output to the first isolation end 211 through the second isolation end 212, so that the pressure of the module output end 21 is transferred to the pressure output port 10, compared with the first isolation valve 210, the second isolation end 212 corresponds to the air inlet port, the first isolation end 211 corresponds to the air outlet port, and in the closed state of the isolation valve 210, the valve block 219 and the second isolation end 212 have larger stress areas and better sealing effect, so that the pressure bearable by the second isolation end 212 is larger than the pressure bearable by the first isolation end 211, and the isolation tightness of the isolation valve 210 can be ensured.

When the module output 21 is used to output a negative pressure, referring to fig. 2, the isolation valve 210 includes a first isolation end 211 and a second isolation end 212. Wherein the first isolation end 211 communicates with the pressure output port 10 and the second isolation end 212 communicates with the module output 21. In the open state of the isolation valve 210, the pressure medium can be output to the second isolation end 212 through the first isolation end 211, so that the pressure of the module output end 21 is transferred to the pressure output port 10, and the negative pressure is transferred to the second isolation end 212, so that the first isolation end 211 corresponds to the air inlet port and the second isolation end 212 corresponds to the air outlet port in comparison with the first isolation valve 210, and in the closed state of the isolation valve 210, the valve block 219 and the second isolation end 212 have larger stress areas, so that the sealing effect is better, and the first isolation end 211 can bear the negative pressure which is larger than the second isolation end 212 can bear, so that the isolation tightness of the isolation valve 210 can be ensured.

Wherein, referring to fig. 2, the isolation valve 210 may further include a valve cavity, the valve block 219 is movably disposed in the valve cavity, and the first isolation end 211 and the second isolation end 212 are disposed on one of sidewalls of the valve cavity. When the isolation valve 210 is in an open state, the first isolation end 211 and the second isolation end 212 are spaced from the valve block 219 to allow the air outlet end to communicate with the air inlet end. When the isolation valve 210 is in a closed state, the valve block 219 abuts against the first isolation end 211 and the second isolation end 212 to isolate the outlet end from the inlet end. In addition, the second isolation end 212 is located on the central axis of the valve block 219, and the first isolation end 211 is disposed offset from the central axis of the valve block 219 such that the second isolation end 212 can withstand a positive pressure greater than the first isolation end 211 when the module output end 21 outputs a positive pressure, and the first isolation end 211 can withstand a negative pressure greater than the second isolation end 212 when the module output end 21 outputs a negative pressure.

As can be seen from the foregoing description, in some cases, if the isolation valve 210 represents the pressure-bearing capacity in terms of the relative pressure, only one such isolation valve 210 needs to be configured to achieve both positive and negative pressures, for example, the second isolation end 212 of a certain isolation valve may bear a relative pressure of 1MPa, and the first isolation end 211 may bear a relative pressure of 800kPa, it means that the second isolation end 212 may bear a positive pressure of 1MPa or less, or may bear a negative pressure of-1 MPa or more, and the first isolation end 211 may bear a positive pressure of 800kPa or less, or may bear a negative pressure of-800 kPa or more. In other cases, if the isolation valve 210 has at least one of the positive pressure resistance and the negative pressure resistance, it is necessary to select according to the actual pressure resistance of the isolation valve 210.

Also, for example, when the module output port 21 is used to output positive pressure, as shown in fig. 3, the isolation valve 210 may include a first isolation port 211 'and a second isolation port 212', wherein the second isolation port 212 'corresponds to an air inlet port, communicates with the module output port 21, and the first isolation port 211' corresponds to an air outlet port, communicates with the pressure output port 10, and in a closed state of the isolation valve 210, the pressure bearable by the second isolation port 212 'is greater than the pressure bearable by the first isolation port 211', so that isolation tightness of the isolation valve 210 may be ensured.

When the module output port 21 is used to output a negative pressure, in some embodiments of the present application, as shown in fig. 3, the isolation valve 210 may include a first isolation port 211' and a second isolation port 212', wherein the first isolation port 211' corresponds to an air inlet port and communicates with the pressure output port 10, and the second isolation port 212' corresponds to an air outlet port and communicates with the module output port 21, and in a closed state of the isolation valve 210, the negative pressure that the first isolation port 211' can withstand is greater than the negative pressure that the second isolation port 212' can withstand, for the negative pressure, the smaller the pressure and the greater the difference between the atmospheric pressures, i.e., the second isolation port 212' can withstand a relatively lower negative pressure, so that the isolation tightness of the isolation valve 210 can be ensured when the pressure output by the control module 20 is less than the pressure in the pressure connection device. It will be appreciated that there are a variety of ways to implement the isolation valve, and there are a variety of configurations to distinguish between the pressure-bearing configurations, and in both examples, the second isolation end of the isolation valve is divided into a second isolation end 212 and a second isolation end 212', the first isolation end is divided into a first isolation end 211 and a first isolation end 211', and the components with which the first isolation end and the second isolation end communicate respectively are illustrated by the two configurations of fig. 2 and 3.

As shown in fig. 3, to achieve the connection or disconnection between the first isolation end 211 'and the second isolation end 212', the isolation valve 210 may further include a sealing member 218, a valve block 219, and a valve cavity, the valve block 219 is movably disposed in the valve cavity, the sealing member 218 is sleeved on the valve block 219, and the outer diameter of the sealing member 218 is slightly larger than the inner diameter of the valve cavity, and the sealing member 218 can seal the valve cavity so that the pressure medium cannot leak through the movable position of the valve block 219. When the isolation valve 210 is in an open state, the first isolation end 211 'and the second isolation end 212' are spaced apart from the valve block 219 so that the air outlet end and the air inlet end are communicated. When the isolation valve 210 is in a closed state, one end of the valve block 219 is sealed to the valve cavity by the seal 218, and the other end is blocked on the second isolation end 212', so that the first isolation end 211' and the second isolation end 212' are disconnected, i.e., the air outlet end and the air inlet end are disconnected. By arranging the isolation valve 210 on the output branch 22, when the module output end 21 outputs positive pressure, the second isolation end 212 capable of bearing relatively high pressure is communicated with the module output end 21, and the first isolation end 211 capable of bearing relatively low pressure is communicated with the pressure output port 10, so that the pressure of the module output end 21 is higher than the pressure in the pressure connecting device, and the pressure of the pressure connecting device is provided by the pressure control device, therefore, the pressure in the pressure connecting device is not higher than the pressure of the module output end 21, and the isolation valve cannot be backflushed to be damaged.

When the module output end 21 outputs the negative pressure, the first isolation end 211 capable of bearing the relatively large negative pressure (i.e. the absolute value of the gauge pressure is smaller) is communicated with the pressure output port 10, and the second isolation end 212 capable of bearing the relatively small negative pressure (i.e. the absolute value of the gauge pressure is larger) is communicated with the module output end 21, so that the pressure medium in the pressure connecting device can be ensured not to enter the pressure control device, and an independent detection space is formed between the pressure control device and the pressure connecting device.

In the above embodiment, the structure of the isolation valve 210 in the control pressure module 20 is determined according to the type of the output pressure of the module output terminal 21, so that the isolation valve 210 can isolate the pressure output port 10 from the control pressure module 20 better, and the risk of pressure leakage is reduced.

In order to cover the problem pressure point in the working state during the system pressure test, when the output pressure of the pressure control device is positive pressure, the output pressure should be higher than that in the normal working state during the test, and when the output pressure of the pressure control device is negative pressure, the output pressure should be lower than that in the normal working state during the test, thereby increasing the pressure detection range of the test process and covering the problem pressure point in the working state.

In the test process, according to the pressure measurement signal, if the output pressure of the pressure control device changes normally, the pressure control device can work normally under the condition of covering the working pressure, the source of the abnormal problem is not the pressure control device, the pressure control device can be used as a reliable source to detect the pressure connecting device, otherwise, if the output pressure of the pressure control device changes abnormally, the pressure control device cannot work normally, the pressure control device can be replaced, and therefore the problem of pressure abnormality can be solved rapidly.

For example, taking positive pressure leak detection as an example, the target pressure value to be detected is a first pressure, in the self-detection process, the connection between the pressure control device and the pressure connection device is kept unchanged, the second pressure can be generated by controlling the pressure control device, the second pressure is greater than the first pressure, if the pressure control device can generate the second pressure, that is, the pressure of the module output end 21 reaches and is stabilized at the second pressure, the pressure control device can be considered not to leak under the condition of the first pressure, and then the result that the pressure control device can work normally is obtained.

Thus, in some embodiments of the present application, in order to reduce the influence of the high-pressure medium input on the isolation valve 210 and improve the isolation effect of the isolation valve 210 on the pressure medium, as shown in fig. 4, when the module output end 21 is used to output positive pressure, the module output end 21 is a high-pressure medium end, the pressure output port 10 is a low-pressure medium end, and the isolation valve 210 includes a third valve cavity 213, a third valve block 214, and a third valve hole 215, wherein the third valve cavity 213 is in communication with the module output end 21, the third valve block 214 is configured to be movable within the third valve cavity 213, and the third valve hole 215 is in communication with the pressure output port 10, so that the third valve block 214 can close the low-pressure medium end and the high-pressure medium flowing in from the high-pressure medium end cannot directly affect the third valve block 214. If the isolation valve 210 is in the open state, the pressure medium flows from the module output port 21 to the pressure output port 10, and when the isolation valve 210 is in the closed state, the third valve block 214 is sealed to the third valve hole 215, and the sealing forces of the third valve block 214 and the third valve hole 215 are directly related to the relative pressures of the module output port 21 and the pressure output port 10, so that medium flows in high and low pressure environments are avoided.

When the module output end 21 is used for outputting negative pressure, the module output end 21 is a low pressure medium end, the pressure output port 10 is a high pressure medium end, and as shown in fig. 5, the isolation valve 210 includes a fourth valve cavity 213', a fourth valve block 214', and a fourth valve hole 215', wherein the fourth valve cavity 213' is used for communicating with the pressure output port 10, the fourth valve block 214' is configured to be movable in the fourth valve cavity 213', and the fourth valve hole 215' is in communication with the module output end 21. When the isolation valve 210 is in the closed state, the fourth valve block 214 'seals against the fourth valve bore 215', and the sealing force of the fourth valve block 214 'and the fourth valve bore 215' is positively correlated to the relative pressures of the module output and the pressure output port.

It should be understood that when the module output terminal 21 outputs positive and negative pressures, the isolation valve 210 is applied in the same structure, but is different from the structure of the valve hole connection. In this embodiment, since the relative pressure between the pressure control device and the two sides of the pressure connection device is higher than the pressure in the normal working process in the testing process, in order to avoid the sealing damage of the isolation valve 210 by the high-pressure medium, the valve hole of the isolation valve 210 is communicated with the module output end 21 and one end with lower relative pressure in the pressure output port 10, so that the high-pressure medium flows in from the side surface of the valve block, that is, the low-pressure medium end is connected with the valve hole, so that the pressure medium at the high-pressure medium end cannot flow to the low-pressure medium end, thereby realizing the isolation of the pressure environment, and the high-pressure medium flowing in from the side surface of the valve block reduces the influence of the high-pressure medium on the isolation valve 210, and reduces the risk of pressure leakage caused by the overlarge stress of the valve block at high pressure.

In some embodiments of the present application, in order to increase the sealing force between the third valve block 214 and the third valve hole 215, as shown in fig. 4, a sealing ring 216 may be disposed on the third valve block 214, the shape of the sealing ring 216 is the same as that of the third valve hole 215, the inner diameter of the sealing ring 216 is larger than that of the third valve hole 215, and the outer diameter of the sealing ring 216 is smaller than that of the third valve block 214. The sealing ring 216 contacts the wall of the third valve hole 215 after the third valve block 214 seals the third valve hole 215 to provide a better sealing effect, and the sealing ring 216 may be a flexible material having a certain deformability, such as rubber, so as to provide a certain friction force when the third valve block 214 closes the third valve hole 215, thereby reducing the influence of the high pressure medium in the third valve cavity 213 on the third valve block 214. Similarly, as shown in fig. 5, a sealing ring 216 may be disposed on the fourth valve block 214 'to increase the sealing force between the fourth valve block 214' and the fourth valve hole 215', and it should be understood that the structure and function of the sealing ring 216 disposed on the fourth valve block 214' are the same as those of the above embodiment, and are not repeated in the present application.

By the isolation valve 210 in the above embodiment, the pressure control device and the pressure connection device can be isolated, but the isolation valve 210 in the above embodiment needs to be connected to the end with lower relative pressure by limiting the connection mode, that is, the valve hole, so as to obtain a better isolation effect, so that the output form of the pressure control device is limited, and when the isolation valve 210 is applied to the pressure control device with positive output pressure, the valve hole is connected to the pressure output port 10, and when the output pressure of the pressure control device becomes negative pressure, the relative pressure of the pressure output port 10 is higher, so that the isolation valve 210 has a risk of unstable isolation.

Therefore, in order to avoid the problem of unstable isolation caused by the relative pressure change caused by the switching of the output pressure types of the pressure control device, referring to fig. 6, in this embodiment, the isolation valve 210 may include a third valve hole 215, a third valve block 214, a fourth valve hole 215', a fourth valve block 214', and a fifth valve cavity 217, wherein the fifth valve cavity 217 is used for accommodating the gaseous medium, and the third valve hole 215 and the fourth valve hole 215' are respectively communicated with the fifth valve cavity 217, so that the gaseous medium can circulate through the fifth valve cavity 217. The third and fourth valve holes 215 and 215' may be respectively communicated with one of the pressure output port 10 and the module output port 21, and a flow of pressure medium between the pressure output port 10 and the module output port 21 can be achieved with the isolation valve 210 in an open state.

While the third valve block 214 is configured to be movable within the fifth valve cavity 217, the fourth valve block 214' is configured to be movable within the fifth valve cavity 217, the third valve block 214 may seal the third valve bore 215, and the fourth valve block 214' may seal the fourth valve bore 215 '. For example, the pressure output port 10 may be communicated with the third valve hole 215, the module output port 21 may be communicated with the fourth valve hole 215', and if the pressure abnormality occurs by the pressure device, and the test is required, if the output pressure is positive, the isolation valve 210 is controlled to be in a closed state, so that the third valve block 214 is sealed in the third valve hole 215 under pressure; if the output pressure is negative, when the isolation valve 210 is in the closed state, the fourth valve block 214 'is controlled to be sealed in the fourth valve hole 215', so that the high-pressure medium and the low-pressure medium are isolated by controlling different valve blocks to seal the corresponding valve holes on the basis of not changing the connection mode of the isolation valve 210, and the risk of pressure leakage caused by overlarge stress of the valve blocks during high pressure is reduced.

It should be understood that in some embodiments, the isolation valve 210 may be further connected in such a way that the third valve hole 215 is in communication with the module output port 21, and the fourth valve hole 215' is in communication with the pressure output port 10, and the valve hole in communication with the low pressure medium end may be closed by a control valve block, so as to isolate the high pressure medium from the low pressure medium.

In some embodiments of the present application, in order to reduce the influence on the pressure medium in the pressure control device when the isolation valve 210 is closed, as shown in fig. 7, the pressure control module 20 further includes a pressure chamber 23, where the pressure chamber 23 is used to contain the gas medium, and the pressure chamber 23 is disposed in the output branch 22. Illustratively, during the process that the control pressure module 20 is connected to the pressure output port 10 through the output branch 22, the pressure chamber 23 is connected to the output branch 22, and when the isolation valve 210 is in the closed state, the module output end 21 is connected to the pressure chamber 23, so as to form a space for detecting the pressure of the module output end 21. In this embodiment, by providing the pressure chamber 23, the pressure of the medium in the output branch 22 is stabilized, so as to reduce the unstable pressure in the pressure control device when the isolation valve 210 is closed.

Further, in order to measure the pressure of the medium in the pressure control device, the pressure control device further includes a pressure measuring module 40, where the pressure measuring module 40 is communicated with the pressure cavity 23 through a measuring branch 41, and an inner diameter of the measuring branch 41 is smaller than an inner diameter of the pressure cavity 23, so that when the isolation valve 210 is in a closed state, a pressure change of the measuring branch 41 is smaller than or equal to a pressure change of the pressure cavity 23. By setting the structure of the pressure cavity 23, when the isolation valve 210 is in the closed state, the pressure change of the measurement branch 41 is stable, so that the pressure measurement module 40 is convenient for pressure measurement. Illustratively, the volume of the pressure vessel 23 may be 3-25ml, such that the pressure fluctuations of the output branch 22 are reduced when the isolation valve 210 is opened and closed, while also reducing the time for the pressure vessel 23 to reach a steady pressure.

In some embodiments of the present application, in order to more accurately measure the pressure value in the pressure control device after the isolation valve 210 is closed, as shown in fig. 7, the pressure measuring module 40 may include a first pressure measuring module 410 and a second pressure measuring module 420, where the maximum value of the measuring range of the first pressure measuring module 410 is greater than the maximum value of the measuring range of the second pressure measuring module 420, and/or the minimum value of the measuring range of the first pressure measuring module 410 is less than the minimum value of the measuring range of the second pressure measuring module 420, so that the measuring range of the first pressure measuring module 410 is greater than the second pressure measuring module 420, and the measuring accuracy of the second pressure measuring module 420 is higher.

The pressure measuring module 40 is connected to the pressure chamber 23 via a measuring branch 41, so as to receive the pressure medium for measurement. Specifically, the first pressure measuring module 410 is detachably connected to the first measuring port 411, and the first measuring port 411 is connected to the pressure cavity 23 through the first measuring branch 412, the inner diameter of the first measuring branch 412 is smaller than the inner diameter of the pressure cavity 23, and the pressure medium in the pressure cavity 23 can flow to the first measuring port 411 through the first measuring branch 412 and flow into the first pressure measuring module 410. The second pressure measuring module 420 is detachably connected to the second measuring port 421, the second measuring port 421 is connected to the pressure chamber 23 through the second measuring branch 422, the inner diameter of the second measuring branch 422 is smaller than the inner diameter of the pressure chamber 23, and the pressure medium in the pressure chamber 23 can flow to the second measuring port 421 through the second measuring branch 422 and flow into the second pressure measuring module 420.

In this embodiment, the second measurement branch 422 is further provided with a first stop valve 430, the first stop valve 430 is used for controlling the on-off of the second measurement branch 422, so as to realize the on-off between the second pressure measuring module 420 and the pressure cavity 23, and the control module 30 is electrically connected with the first stop valve 430 and is used for controlling the on-off state of the first stop valve 430.

For example, when the pressure measurement is performed, the first stop valve 430 is in a closed state, at this time, the pressure medium may be first conveyed to the first pressure measuring module 410 through the first measuring branch 412 for measurement, if the measured medium pressure is within the range of the second pressure measuring module 420, the first stop valve 430 is controlled to be switched to an open state, so that the pressure medium is conveyed to the second pressure measuring module 420 through the second measuring branch 422 for pressure measurement, thereby obtaining a pressure measurement result with higher accuracy, and improving the measurement accuracy of the pressure measuring module 40;

if the measured medium pressure is outside the range of the second pressure measuring module 420, the measured result of the first pressure measuring module 410 may be recorded as a pressure value, so as to increase the accuracy of pressure measurement on the basis of maintaining the range of the pressure measuring module 40.

In some embodiments, the first pressure measuring module 410 and the second pressure measuring module 420 can be controlled to measure the pressure simultaneously, and when the pressure value exceeds the measuring range of the second pressure measuring module 420, the first stop valve 430 interrupts the second measuring branch 422 to avoid damage to the second pressure measuring module 420 caused by excessive pressure. When the pressure value does not exceed the measuring range of the second pressure measuring module 420, two measurement results can be obtained, and the most suitable one of the two measurement results is selected according to the current working requirement, such as the measurement accuracy requirement, and the current pressure value is obtained.

It should be understood that more than two measurement branches may be further disposed in the pressure measurement module 40, so that the corresponding measuring ranges of the first pressure measurement module 410 are respectively and accurately measured by the plurality of pressure measurement modules 410, so that the pressure measurement value is finer, and the specific implementation method is the same as the above-mentioned manner of accurately measuring the pressure by the second pressure measurement module 420, which is not described in detail in the present application.

In some embodiments of the present application, as shown in fig. 7, the pressure control device further includes a pressure relief port 50, where the pressure relief port 50 is used to discharge the gaseous medium to the outside of the pressure control device, and the pressure relief port 50 is in communication with the pressure cavity 23 through a pressure relief branch 51, so as to discharge the pressure medium in the pressure cavity 23.

Further, the pressure release branch 51 is further provided with a second stop valve 52, and the control module 30 is electrically connected with the second stop valve 52 and is used for controlling the open-close state of the second stop valve 52, so that the on-off of the pressure release branch 51 is controlled through the second stop valve 52, and the pressure release branch 51 is controlled. Illustratively, when the second stop valve 52 is opened, the gaseous medium in the pressure cavity 23 is discharged through the pressure release branch 51, and the inner diameter of the pressure release branch 51 is smaller than the inner diameter of the pressure cavity 23, so that when the isolation valve 210 is in a closed state, the pressure change of the pressure release branch 51 is smaller than or equal to the pressure change of the pressure cavity 23, thereby improving the stability of the medium pressure of the pressure control device, and releasing the pressure in the pressure control device after the measurement is completed, so as to facilitate the subsequent work of the pressure control device.

In order to be able to access the individual modules, as shown in fig. 8, the pressure chamber 23 is provided with a first port 231, a second port 232 and a third port 233, the first port 231 being in communication with the output of the pressure regulating module 20, the second port 232 being in communication with the output branch 22, the third port 233 being in communication with the pressure relief branch 51, so that a flow of pressure medium is achieved. In some embodiments, the positional relationship among the first port 231, the second port 232 and the third port 233 needs to be set to achieve different pressure stabilizing effects, and illustratively, the position of the third port 233 is lower than the position of the first port 231, and the position of the third port 233 is lower than the position 232 of the second port, so that when the second stop valve 52 is opened, solid or liquid impurities in the gaseous medium can be discharged through the pressure release branch 51. By arranging the pressure relief port 50 and connecting with the pressure containing cavity 23, when the isolation valve 210 is in a closed state, the pressure in the pressure control device can be relieved by controlling the second stop valve 52, so that the pressure accumulation in the pressure containing cavity 23 is reduced, and the pressure stability in the pressure control device is improved.

It should be understood that the pressure control device is a device that performs adjustment control of the pressure medium, but the pressure control device does not directly generate the pressure medium, and thus the pressure control device needs to communicate with the medium supply apparatus to acquire the pressure medium. In some embodiments of the present application, as shown in fig. 7, the pressure control device is provided with an input port 60, the input port 60 being used for communicating with the pneumatic medium supply apparatus, and the pressure control device being capable of receiving the pneumatic medium output from the pneumatic medium supply apparatus through the input port 60. Meanwhile, in order to realize pressure control of the gas medium, the pressure control module 20 includes a pressure control branch 24, the input port 60 is communicated with the pressure cavity 23 through the pressure control branch 24, and the pressure control branch 24 is provided with a pressure control valve 241 for controlling the pressure medium flowing through the pressure control branch 24, and the inner diameter of the pressure control branch 24 is smaller than the inner diameter of the pressure cavity 23. The control module 30 is electrically connected with the pressure control valve 241, and the pressure control valve 241 regulates and controls the pressure of the medium in the pressure control branch 24 by regulating the opening, so that the control module 30 can regulate the opening of the pressure control valve 241 through an electric signal, and the pressure control device can output the medium with different pressure values. In the above embodiment, the medium input and pressure control of the pressure control device are realized through the input port 60 and the control pressure module 20, so that the medium pressure in the pressure control device is stable and controllable.

The pressure control branch 24 may also be provided with a pressure detection module, specifically, the pressure detection module is disposed on one side of the pressure control valve 241, where the side is communicated with the input port 60, so as to detect the pressure medium input into the pressure control branch 24, and adjust the opening of the pressure control valve 241 in cooperation with the control module, so as to realize accurate control of pressure.

It should be understood that, as shown in fig. 7, two or more input ports 60 and pressure control branches 24 may be provided in the pressure control device, so as to be able to receive media with different pressures, so as to control the output pressure by mixing media with different pressures, and the provision of multiple input ports 60 and pressure control branches 24 also enriches the pressure source of the pressure control device, and reduces the risk of unstable pressure supply caused by damage to the pressure supply device.

Referring to fig. 9, an external view of a pressure control device according to an embodiment of the present application is shown, and referring to fig. 10, an front view of a pressure control device according to an embodiment of the present application is shown. As shown in fig. 9 and 10, in some embodiments of the present application, the pressure control device may include a body 70, and each module in the pressure control device is disposed inside the body 70, thereby providing support and protection for each module. In some embodiments, the body 70 is provided with a touch display screen 71 and a measurement installation cabin 72, the measurement protection cover 73 is disposed on the measurement installation cabin 72, so as to protect the internal space of the measurement installation cabin 72, the first measurement port 411 and the second measurement port 421 are disposed in the measurement installation cabin 72, the first pressure measurement module 410 may be connected to the first measurement port 411 so as to be in communication with the pressure control device, and the second pressure measurement module 410 may be connected to the second measurement port 421 so as to be in communication with the pressure control device.

In some embodiments, a reference pressure assembly may be further disposed in the machine body 70, where the reference pressure assembly includes a reference input port, and the reference input port is connected to a third measurement port through a reference branch, and a third pressure measurement module may be further disposed in the third measurement port to detect the reference pressure.

In some embodiments of the present application, a power module may be further provided in the pressure control device, and the power module may be connected to the control module 30 to supply power to each module in the pressure control device. It should be noted that, the power source of the power module may be itself, and the power module includes a storage battery or a similar power storage component, and the power source of the power module may also be an external power source, for example, the power module may include a power conversion component, where one end of the power module is electrically connected to an external power source, for example, a 220V/380V external power source, and after the external power is converted, an electric energy form corresponding to the internal power module is obtained, and then distributed, for example, the power module is only a general electric connection circuit, and transmits the external power to the control module 30.

As shown in fig. 11, the control module 30 is electrically connected to the isolation valve 210, the first stop valve 430, the second stop valve 52, the pressure control valve 241, and the first and second pressure measurement modules 410 and 420, respectively. In the working process of the system, if the control module 30 receives an instruction that the pressure of the pressure-using device needs to be detected, the isolation valve 210 can be controlled to be closed through a signal to form an isolated pressure control device internal environment, and at this time, the pressure output port 10 and the pressure-using device do not need to be detached, because the pressure medium cannot pass through the isolation valve 210. The control module 30 may operate according to the general working procedure described above, and control the first pressure measuring module 410 and the second pressure measuring module 420 to perform pressure detection, so as to obtain the current pressure value and the pressure control target. If the pressure control device can reach the pressure control target, which indicates that the pressure control device works normally independently, the isolation valve 210 can be controlled to be opened by a signal, the pressure control device is utilized to perform fault detection on the pressure equipment, if the pressure control device can not reach the pressure control target, which indicates that the pressure control device has a problem, the user can replace the pressure control device, and the fault condition can be found and removed more quickly no matter what condition is, so that the working efficiency is improved.

In accordance with the foregoing embodiments of the pressure control device, the present application provides a pressure control system comprising: and the pressure connecting device is used for communicating the pressure instrument to be detected. The pressure control device of any of the foregoing embodiments, wherein the pressure control device comprises an isolation valve and a pressure output port, the pressure output port in communication with the pressure connection device. And when the isolation valve is in a closed state, the measurement result of the reference pressure instrument is used for detecting the pressure of the pressure connecting device. Therefore, a pressure control system can be constructed through any one of the pressure control devices, so that when the pressure control system detects the pressure, the pressure environment is separated through the isolating valve, the number of times of separating the pressure control device from other devices is reduced, and the efficiency of pressure detection is improved.

As can be seen from the above technical solution, the present application provides a pressure control device, which includes a pressure output port 10, a pressure control module 20 and a control module 30, wherein the pressure output port 10 is used for communicating with a pressure meter to be detected, the pressure control module 20 is provided with a module output end 21, the module output end 21 is communicated with the pressure output port 10 through an output branch 22, the pressure control module 20 is used for controlling a medium to adjust the pressure of the module output end 10, the output branch 22 is provided with an isolation valve 210, the isolation valve 210 prevents the medium from moving from high pressure to low pressure under a closed state so as to interrupt the communication between the module output end 21 and the pressure output port 10, and the control module 30 is electrically connected with the isolation valve 210 and is used for controlling the open/close state of the isolation valve 210. By arranging the isolation valve 210 on the output branch 22, the isolation valve can be controlled to enter a closed state in the pressure detection process, the module output end 21 is isolated from the pressure output port 10, and because of the isolation direction of the isolation valve 210, if the module output end 21 outputs positive pressure, the module output end 21 can generate positive pressure larger than the pressure output port 10, and if the module output end 21 outputs negative pressure, the module output end 21 can generate negative pressure smaller than the pressure output port 10, so that the pressure output port 10 is not required to be detached from the pressure control device, the pressure control device can form an independent pressure environment, and the pressure self-detection efficiency is improved.

The above-provided detailed description is merely a few examples under the general inventive concept and does not limit the scope of the present application. Any other embodiments which are extended according to the solution of the application without inventive effort fall within the scope of protection of the application for a person skilled in the art.

Claims

1. A pressure control device, comprising:

the pressure output port is used for communicating a pressure instrument to be detected;

the pressure control module is provided with a module output end and is used for controlling a gas medium to adjust the pressure of the module output end, and the module output end is communicated with the pressure output port through an output branch; the output branch is provided with an isolation valve, if the pressure of the output end of the module is negative pressure, the isolation valve prevents the gas medium from moving towards the direction of the output end of the module under the closing state, so that the pressure of the output end of the module can be smaller than the pressure of the pressure output port, and if the pressure of the output end of the module is positive pressure, the isolation valve prevents the gas medium from moving towards the direction of the pressure output port under the closing state, so that the pressure of the output end of the module can be larger than the pressure of the pressure output port;

And the control module is electrically connected with the isolation valve and is used for controlling the opening and closing states of the isolation valve.

2. The pressure control device of claim 1, wherein the module output is configured to output a positive pressure, and the isolation valve comprises:

the first isolation end is communicated with the pressure output port;

the second isolation end is communicated with the module output end, and the bearable positive pressure of the second isolation end is larger than the bearable positive pressure of the first isolation end in the closed state of the isolation valve;

or,

the module output is used for outputting negative pressure, the isolation valve includes:

the first isolation end is communicated with the pressure output port;

and the second isolation end is communicated with the module output end, and the negative pressure bearable by the second isolation end is smaller than that bearable by the first isolation end in the closing state of the isolation valve.

3. The pressure control device of claim 1, wherein the module output is configured to output a positive pressure, and the isolation valve comprises:

The third valve cavity is communicated with the module output end;

a third valve block configured to be movable within the third valve chamber;

a third valve bore in communication with the pressure output port, the third valve block being sealed to the third valve bore when the isolation valve is in a closed state, the sealing forces of the third valve block and the third valve bore being positively correlated to the relative pressures of the module output port and the pressure output port;

or,

the fourth valve cavity is used for communicating the pressure output port;

a fourth valve block configured to be movable within the fourth valve chamber;

and the fourth valve hole is communicated with the module output end, when the isolation valve is in a closed state, the fourth valve block is sealed in the fourth valve hole, and the sealing force of the fourth valve block and the fourth valve hole is positively related to the relative pressure of the module output end and the pressure output port.

4. The pressure control device of claim 1, wherein the isolation valve comprises:

A third valve bore in communication with the pressure output port;

a fourth valve bore in communication with the module output port;

the third valve hole and the fourth valve hole are respectively communicated with the fifth valve cavity;

a third valve block configured to be movable in the fifth valve chamber, the third valve block being pressure-sealed to the third valve hole if the output pressure of the module output end is positive and the isolation valve is in a closed state;

and the fourth valve block is configured to be movable in the fifth valve cavity, and is sealed in the fourth valve hole under pressure when the isolating valve is in a closed state if the output pressure of the output end of the module is negative pressure.

5. The pressure control device of any one of claims 1-4, wherein the pressure control module comprises a pressure vessel for containing a gaseous medium;

the pressure control module is communicated with the pressure output port through an output branch and comprises: the pressure containing cavity is communicated with the output branch, and when the isolation valve is in a closed state, the module output end is communicated with the pressure containing cavity so as to form a space for detecting the pressure of the module output end.

6. The pressure control device of claim 5, further comprising a pressure measurement module in communication with the pressure vessel via a measurement branch having an inner diameter less than an inner diameter of the pressure vessel such that when the isolation valve is in a closed state, a pressure change of the measurement branch is less than or equal to a pressure change of the pressure vessel.

7. The pressure control device of claim 6, wherein the pressure measurement module comprises a first pressure measurement module and a second pressure measurement module, wherein a maximum range of the first pressure measurement module is greater than a maximum range of the second pressure measurement module, and/or wherein a minimum range of the first pressure measurement module is less than a minimum range of the second pressure measurement module;

the pressure measuring module is communicated with the pressure cavity through a measuring branch and comprises,

the first pressure measuring module is detachably communicated with a first measuring port, the first measuring port is communicated with the pressure containing cavity through a first measuring branch, and the inner diameter of the first measuring branch is smaller than that of the pressure containing cavity;

the second pressure measuring module is detachably communicated with a second measuring port, the second measuring port is communicated with the pressure containing cavity through a second measuring branch, the inner diameter of the second measuring branch is smaller than that of the pressure containing cavity, a first stop valve is arranged on the second measuring branch and used for controlling the on-off of the second measuring branch, and the control module is electrically connected with the first stop valve and used for controlling the opening and closing states of the first stop valve.

8. The pressure control device according to claim 5, further comprising a pressure release port, wherein the pressure release port is used for discharging a gas medium to the outside of the pressure control device, the pressure release port is communicated with the pressure containing cavity through a pressure release branch, a second stop valve is arranged on the pressure release branch and used for controlling the on-off of the pressure release branch, when the second stop valve is opened, the gas medium in the pressure containing cavity is discharged through the pressure release branch, and the control module is electrically connected with the second stop valve and used for controlling the opening and closing states of the second stop valve;

the inner diameter of the pressure relief branch is smaller than the inner diameter of the pressure containing cavity, so that when the isolation valve is in a closed state, the pressure change of the pressure relief branch is smaller than or equal to the pressure change of the pressure containing cavity;

the pressure holding cavity is provided with:

the first port is communicated with the output end of the pressure control module;

a second port in communication with the output branch;

and the third port is communicated with the pressure relief branch, the position of the third port is lower than that of the first port, and the position of the third port is lower than that of the second port, so that when the second stop valve is opened, solid or liquid impurities in the gas medium are discharged through the pressure relief branch.

9. The pressure control device of claim 5, wherein,

the pressure control device is provided with an input port, the input port is used for being communicated with the pneumatic medium supply equipment, and the pneumatic medium output by the pneumatic medium supply equipment is received through the input port;

the pressure control module comprises a pressure control branch, the input port is communicated with the pressure containing cavity through the pressure control branch, a pressure control valve is arranged on the pressure control branch and used for controlling pressure medium flowing through the pressure control branch, and the control module is electrically connected with the pressure control valve;

the inner diameter of the pressure control branch is smaller than the inner diameter of the pressure containing cavity.

10. A pressure control system, comprising:

the pressure connecting device is used for communicating a pressure instrument to be detected;

the pressure control device of any one of claims 1-9, comprising an isolation valve and a pressure output port in communication with the pressure connection device;

and the accuracy level of the reference pressure instrument is higher than that of the detected pressure instrument, and when the isolation valve is in a closed state, the measurement result of the reference pressure instrument is used for detecting the pressure of the pressure connecting device.