CN220137587U - Pressure controller and pressure control system - Google Patents

Abstract

The application provides a pressure controller and a pressure control system, which comprise a pressure output port, a pressure control assembly, a switching mechanism, a first pressure communication port, a second pressure communication port and a third pressure communication port, wherein the pressure output port is used for outputting controlled pressure, the output end of the pressure control assembly is communicated with the pressure output port, the first pressure communication port is communicated with a positive pressure source, the second pressure communication port is communicated with a negative pressure source, the third pressure communication port is communicated with the external atmosphere, and the switching mechanism can switch the connection relation between the second pressure communication port and the third pressure communication port and the pressure control assembly so as to provide different pressure mediums for the pressure control assembly. Through setting up switching mechanism, when carrying out pressure control, can switch second pressure communication port and third pressure communication port, frequent change pressure source when avoiding satisfying different target pressure value demands improves pressure controller's confession pressure efficiency.

Description

Pressure controller and pressure control system

Technical Field

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

Background

And the pressure controller can output target pressure according to the requirement of a user and is used for detecting pressure meters, pressure transmitters, pressure switches and other pressure meters.

Typically, the pressure controller includes a first pressure communication port, a second pressure communication port, and a pressure output for communicating with a pressure gauge under test. In the detection process, the first pressure communication port provides a first initial pressure, the second pressure communication port provides a second initial pressure, the first initial pressure is larger than the second initial pressure, and the pressure controller controls the first initial pressure and the second initial pressure so that the pressure output by the pressure output end reaches a target pressure value.

However, in order to meet the requirements of different target pressure values, the pressure equipment communicated with the second pressure communication port needs to be repeatedly disassembled and assembled, so that the working efficiency is affected.

Disclosure of Invention

The utility model provides a pressure controller and a pressure control system, which solve the problem that the working efficiency of pressure detection is affected when pressure supply equipment is disassembled, assembled and replaced to meet the requirements of different target pressure values.

In a first aspect, the present utility model provides a pressure controller comprising: a pressure output port for outputting the controlled pressure; the pressure control assembly is used for controlling the pressure medium flowing through, and the output end of the pressure control assembly is communicated with the pressure output port; the first pressure communication port is used for communicating with the positive pressure source and is communicated with the first input end of the pressure control assembly so as to provide positive pressure for the pressure control assembly; the second pressure communication port is used for communicating a negative pressure source; a third pressure communication port for communicating with the outside atmosphere; the switching mechanism comprises a switchable first switching state and a second switching state, and in the first switching state, the second pressure communication port is communicated with the second input end of the pressure control assembly through the switching mechanism so as to provide negative pressure for the pressure control assembly; in the second switching state, the third pressure communication port is communicated with the second input end of the pressure control assembly through the switching mechanism so as to provide atmospheric pressure for the pressure control assembly.

In one possible embodiment, the pressure controller further comprises: the valve input end of the passage protection valve is communicated with the second input end of the pressure control assembly, and the valve output end of the passage protection valve is communicated with the atmosphere; the passage protection valve is used for being conducted when the pressure of the pressure control assembly reaches a preset pressure so as to reduce the pressure of the pressure control assembly.

In one possible embodiment, the access protection valve is a safety valve, the opening pressure of the access protection valve is equal to a preset pressure, and the opening pressure is greater than 0kPa; the opening pressure of the safety valve is smaller than or equal to the maximum bearing pressure of the switching mechanism, or the opening pressure of the passage protection valve is smaller than or equal to the maximum bearing pressure of the negative pressure source.

In one possible embodiment, the passageway protection valve is a check valve, the valve output of the check valve is in communication with the third pressure communication port, such that the valve output of the passageway protection valve is in communication with the atmosphere through the third pressure communication port; the check valve is configured to conduct when the pressure at the valve input is greater than the pressure at the valve output.

In one possible embodiment, the switching mechanism comprises a three-way valve comprising a valve chamber and a valve core, the valve chamber having a first port, a second port and a third port, the first port being in communication with the second input of the pressure control assembly, the second port being in communication with the second pressure communication port, the third port being in communication with the third pressure communication port; the valve core moves in the valve cavity, and in a first switching state, the valve core is plugged on the third port, the first port is communicated with the second port, and the first port is disconnected with the third port; in a second switching state, the valve core is plugged at the second port, the first port is communicated with the third port, and the first port is disconnected with the second port;

Or the switching mechanism comprises a first two-way valve and a second two-way valve which are connected in parallel, wherein the valve input ends of the first two-way valve and the second two-way valve are both communicated with the second input end of the pressure control assembly, the valve output end of the first two-way valve is communicated with the second pressure communication port, the valve output end of the second two-way valve is communicated with the third pressure communication port, and in the first switching state, the first two-way valve is switched on, and the second two-way valve is switched off; in the second switching state, the first two-way valve is turned off and the second two-way valve is turned on.

In one possible embodiment, the pressure controller further comprises a first reference pressure measurement module and a second reference pressure measurement module; the first reference pressure measuring module is communicated with the output end of the pressure control assembly through a first measuring branch, and the second reference pressure measuring module is communicated with the output end of the pressure control assembly through a second measuring branch; the second measuring branch is provided with a first stop valve which is used for controlling the on-off of the second measuring branch; the maximum value of the measuring range of the first reference pressure measuring module is larger than that of the second reference pressure measuring module, and/or the minimum value of the measuring range of the first reference pressure measuring module is smaller than that of the second reference pressure measuring module.

In one possible embodiment, the pressure control assembly comprises: the first pressure control branch is used for controlling positive pressure; one end of the second pressure control branch is communicated with the pressure output port, the other end of the second pressure control branch is communicated with the switching mechanism, and in the first switching state, the second pressure control branch is communicated with the second pressure communication port so as to control the negative pressure; in the second switching state, the second pressure control branch is communicated with the third communication port so as to control the atmospheric pressure.

In one possible implementation mode, a second pressure control valve is arranged on the second pressure control branch, a first valve passage end of the second pressure control valve is communicated with the pressure output port, a second valve passage end of the second pressure control valve is communicated with the switching mechanism, and the second pressure control valve is used for controlling the on-off of the second pressure control branch; the valve input end of the passage protection valve in the pressure controller is communicated between the second valve passage end of the second pressure control valve and the switching mechanism.

In one possible embodiment, the pressure controller further comprises: the input of pressure release pipeline communicates in the output of accuse pressure subassembly, and the output of pressure release pipeline communicates in the atmosphere, is equipped with the relief valve on the pressure release pipeline, and the relief valve is used for controlling the break-make of pressure release pipeline.

In a second aspect, the present application provides a pressure control system comprising: the positive pressure source is used for providing positive pressure; the negative pressure source is used for providing negative pressure; any one of the pressure controllers is provided with a first pressure communication port, a second pressure communication port, a third pressure communication port and a pressure output port, wherein the first pressure communication port is communicated with a positive pressure source, the second pressure communication port is communicated with a negative pressure source, the third pressure communication port is communicated with the atmosphere, and the pressure output port is communicated with a pressure instrument to be detected. By arranging the switching mechanism in the pressure controller, the frequency of dismounting the pressure source in the operation process of the pressure control system is reduced, and the operation efficiency of the pressure control system is improved.

As can be seen from the above technical solution, the present application provides a pressure controller, including a pressure output port, a pressure control assembly, a switching mechanism, a first pressure communication port, a second pressure communication port and a third pressure communication port, where the pressure output port is used to output a controlled pressure, the output end of the pressure control assembly is connected to the pressure output port, the first pressure communication port is connected to a positive pressure source, the second pressure communication port is connected to a negative pressure source, the third pressure communication port is connected to the external atmosphere, the switching mechanism can switch the connection relationship between the second pressure communication port and the third pressure communication port and the pressure control assembly, so that pressure can be provided to the pressure control assembly through the positive pressure source and the negative pressure source according to the pressure control requirement, and in another switching mode, pressure is provided to the pressure control assembly through the positive pressure source and the external atmosphere, so as to avoid frequent replacement of the pressure sources to meet the requirements of different target pressure values, and improve the working efficiency of the pressure controller.

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 structural diagram of a pressure controller according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a path protection valve according to an embodiment of the present application;

FIG. 3 is a schematic diagram of another path protection structure according to an embodiment of the present application;

FIG. 4 is a schematic diagram of another pressure controller according to an embodiment of the present application;

fig. 5 is a connection schematic diagram of a master control module according to an embodiment of the present application.

Illustration of:

10-a pressure control assembly; 20-a switching mechanism; 30-a passage protection valve; 40-a pressure relief pipeline; 50-a main control module;

11-a first pressure control branch; 12-a second pressure control branch; 13-a pressure vessel; 21-a three-way valve; 22-a first two-way valve; 23-a second two-way valve; 41-a pressure relief valve;

100-pressure output port; 110-a first pressure communication port; 120-a second pressure communication port; 130-a third pressure communication port;

111-a first pressure control valve; 112-a first pressure control measurement module; 121-a second pressure control valve; 122-a second pressure control measurement module; 210-a valve cavity; 211-a first port; 212-a second port; 213-third port;

310-a first reference load module; 311-a first measurement branch; 320-a second reference load module; 321-a second measurement branch; 322-a first shut-off valve; 330-a third reference load module; 331-third measurement branch.

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 controller, for short, is a device for controlling pressure by using gas as pressure medium, and is widely used in industrial production process. It should be understood that, in order to output the pressure medium, the pressure controller includes a pressure output port, and the pressure medium, after being controlled by the pressure controller, 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 controller through the pressure output port is referred to as output pressure.

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.

Further, the pressure output port of the pressure controller needs to be connected with the pressure connecting device, so that output pressure is distributed to each pressure-using device, such as a pressure meter to be detected, through a pressure transmission pipeline arranged in the pressure connecting device. The pressure controller and the pressure connection device may, for example, form a pressure system for supplying pressure medium to the pressure device.

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 that the present application is not limited as to whether the pressure output from the pressure controller is positive or negative.

In order to enable the pressure system to generate positive pressure or negative pressure, the pressure controller needs to be provided with a first pressure communication port, a second pressure communication port and a pressure output port, wherein the pressure output port is used for communicating with a pressure instrument to be detected. In the detection process, the first pressure communication port provides a first initial pressure, the second pressure communication port provides a second initial pressure, and the first initial pressure is greater than the second initial pressure, and typically, the first initial pressure is a positive pressure greater than a target pressure value, for example, the first pressure communication port communicates with a positive pressure source (such as an air pump) to provide the positive pressure into the pressure controller, and the second initial pressure is an atmosphere or a negative pressure less than the target pressure value, so that the second pressure communication port communicates with the external atmosphere or the negative pressure source. The pressure controller controls the first initial pressure and the second initial pressure so that the output pressure of the pressure output port reaches a target pressure value.

In the pressure detection process, as the target pressure value required by the pressure equipment changes, the second initial pressure value input by the second pressure communication port changes, and if the target pressure is smaller positive pressure or negative pressure, for example, 10kPa or-10 kPa, the second pressure communication port is communicated with the negative pressure source so that the negative pressure source provides negative pressure medium into the pressure controller, for example, the second pressure communication port is communicated with one end of a negative pressure connecting pipeline, and the other end of the negative pressure connecting pipeline is communicated with the negative pressure source (for example, a vacuum pump); if the target pressure is a larger positive pressure, for example, 1MPa, the second pressure communication port needs to communicate with the atmosphere to provide the atmospheric pressure to the pressure controller, and the smaller positive pressure and the larger positive pressure are only used for illustration, and the values of the actual conditions may be different, and the larger positive pressure is larger than the smaller positive pressure.

Therefore, in the pressure detection process, the object communicated with the second pressure communication port needs to be disassembled and assembled according to the target pressure value. But frequent disassembly and assembly can influence the pressure control efficiency of the pressure controller, reduce the working efficiency of the pressure controller and influence the operation of the pressure equipment. Because the medium can flow from the end with high pressure to the end with low pressure, equipment such as an oil mist isolator is required to be connected between the negative pressure source and the pressure controller for isolation, so that the negative pressure connecting structure is complex, the installation is difficult, and the dismounting efficiency of the negative pressure source is further reduced.

In order to solve the above problems, the present application provides a pressure controller and a pressure control system, which avoid the repeated disassembly and assembly steps of a negative pressure source or a negative pressure connecting pipeline due to different target pressure values in the pressure detection process by switching communication ports in the operation process, and improve the working efficiency of the pressure controller.

Fig. 1 is a schematic structural diagram of a pressure controller according to the present application. As shown in fig. 1, the pressure controller includes a pressure output port 100, a pressure control assembly 10, a first pressure communication port 110, a second pressure communication port 120, a third pressure communication port 130, and a switching mechanism 20. The pressure output port 100 is configured to output pressure controlled by the pressure controller, and the pressure control assembly 10 is configured to control pressure medium flowing through the pressure output port 100, so as to achieve an effect of pressure control, and an output end of the pressure control assembly 10 is communicated with the pressure output port 100, thereby outputting the pressure medium after pressure control through the pressure output port 100.

The first pressure communication port 110 is used for communicating with a positive pressure source to provide a positive pressure medium to the pressure controller, the second pressure communication port 120 is used for communicating with a negative pressure source to provide a negative pressure medium to the pressure controller, and the third pressure communication port 130 is used for communicating with the external atmosphere. The positive pressure source may be an apparatus capable of compressing a gaseous medium such as an air pump to achieve gas pressurization, and the negative pressure source may be an apparatus for reducing a gaseous medium in a container such as a vacuum pump.

The switching mechanism 20 is respectively connected to the second pressure communication port 120, the third pressure communication port 130 and the pressure control assembly 10, and the state of the switching mechanism 20 includes a switchable first switching state and a second switching state, wherein in the first switching state, the second pressure communication port 120 is connected to the pressure control assembly 10 through the switching mechanism 20 to provide the negative pressure to the pressure control assembly 10, and in the second switching state, the third pressure communication port 130 is connected to the pressure control assembly 10 through the switching mechanism 20 to provide the atmospheric pressure to the pressure control assembly 10.

In order to receive the pressure medium input by the pressure communication port, the pressure control assembly 10 is further provided with an input end, wherein the input end comprises a first input end and a second input end, the first input end is communicated with the first pressure communication port 110 and is used for receiving the positive pressure medium input by the first pressure communication port 110, the second input end is communicated with the switching mechanism 20, when the switching mechanism 20 is in a first switching state, the second pressure communication port 120 is communicated with the second input end of the pressure control assembly 10 through the switching mechanism 20 so as to provide negative pressure for the pressure control assembly 10, and when the switching mechanism is in a second switching state, the third pressure communication port 130 is communicated with the second input end of the pressure control assembly 10 through the switching mechanism 20 so as to provide atmospheric pressure for the pressure control assembly 10.

In order to enable the switching mechanism 20 to switch the pressure communication ports in communication with the second input, in some embodiments the switching mechanism 20 may comprise one three-way valve or two-way valves enabling switching of the second pressure communication port 120 and the third pressure communication port 130.

Illustratively, as shown in fig. 2, the switching mechanism 20 includes a three-way valve 21, the three-way valve 21 includes a valve chamber 210 and a valve spool, the valve chamber 210 has a first port 211, a second port 212, and a third port 213, the first port 211 is connected to the second input of the pressure control assembly 10, the second port 212 is connected to the second pressure communication port 120, and the third port 213 is connected to the third pressure communication port 130. The valve core moves in the valve cavity 210, and when the switching mechanism 20 is in the first switching state, the valve core is plugged on the third port 213, so that the first port 211 is communicated with the second port 212, and the first port 211 is disconnected from the third port 213; in the second switching state of the switching mechanism, the valve core is plugged at the second port 212, the first port 211 is communicated with the third port 213, and the first port 211 is disconnected from the second port 212, so that the switching communication between the second input end of the pressure control assembly 10 and the second pressure communication port 120 and the third pressure communication port 130 is realized.

In some embodiments of the present application, as shown in fig. 3, the switching mechanism 20 includes a first two-way valve 22 and a second two-way valve 23 connected in parallel, wherein valve inputs of the first two-way valve 22 and the second two-way valve 23 are both connected to a second input of the pressure control assembly 10, a valve output of the first two-way valve 22 is connected to the second pressure communication port 120, and a valve output of the second two-way valve 23 is connected to the third pressure communication port 130. In the first switching state of the switching mechanism 20, the first two-way valve 22 is turned on, and the second two-way valve 23 is turned off; in the second switching state of the switching mechanism 20, the first two-way valve 22 is turned off and the second two-way valve 23 is turned on, thereby achieving switching communication between the second input end of the pressure control assembly 10 and the second and third pressure communication ports 120 and 130.

In another embodiment of the present application, the three-way valve 21 may not be provided with a spool, but by providing a stop valve between the second port 212 and the second pressure communication port 120 and between the third port 213 and the third pressure communication port 130, respectively, when the switching mechanism 20 is in the first switching state, the second pressure communication port 120 is communicated with the second input end of the pressure control assembly 10 by opening the stop valve between the second port 212 and the second pressure communication port 120, and closing the stop valve between the third port 213 and the third pressure communication port 130; when the switching mechanism 20 is in the second switching state, the third pressure communication port 130 is communicated with the second input terminal of the pressure control assembly 10 by opening the shut-off valve between the third port 213 and the third pressure communication port 130, and closing the shut-off valve between the second port 212 and the second pressure communication port 120. As can be seen from the above embodiments, the manner of implementing the switching mechanism 20 in the present application may be various, and the specific implementation of the switching mechanism 20 in the present application is not limited. By providing such a switching mechanism 20, switching between the second pressure communication port 120 and the third pressure communication port 130 can be achieved, and thus the frequency of attaching and detaching the pressure source to and from the second pressure communication port 120 can be reduced, and the pressure control efficiency of the pressure controller can be improved.

As can be seen from the above embodiments, the third pressure communication port 130 and the switching mechanism 20 are provided in the present application, so that the second pressure communication port 120 and the third pressure communication port 130 can be switched when pressure control is performed, thereby avoiding the problem of frequent replacement of the pressure source when different target pressure values are required. In addition, when the third pressure communication port 130 is required to be communicated with the second input end of the pressure control assembly 10 due to the requirement of the pressure using equipment, the pressure supply efficiency of the pressure controller is improved.

In some embodiments of the present application, in order to improve the pressure stability of the pressure control assembly 10 and provide protection for the negative pressure source that is communicated with the second pressure communication port 120, as shown in fig. 4, the pressure controller further includes a path protection valve 30, a valve input end of the path protection valve 30 is communicated with the second input end of the pressure control assembly 10, a valve output end of the path protection valve 30 is communicated with the atmosphere, and the path protection valve 30 is used for being turned on when the pressure of the pressure control assembly 10 reaches a preset pressure so as to reduce the pressure of the pressure control assembly 10. In this way, the pressure medium can be output to the atmosphere through the passage protection valve 30 when the pressure in the pressure control assembly 10 is high, so that the pressure in the pressure control assembly 10 is reduced, and the safety and stability of the pressure controller are improved.

Illustratively, the passage protection valve 30 may be a relief valve, the opening pressure of the passage protection valve 30 being equal to a preset pressure and the opening pressure being greater than 0kPa, and the opening pressure of the relief valve being less than or equal to the maximum withstand pressure of the switching mechanism 20, or the opening pressure of the passage protection valve 30 being less than or equal to the maximum withstand pressure of the negative pressure source. The passage protection valve 30 is set as a safety valve, so that when the pressure in the pressure control assembly 10 is high, the pressure in the pressure control assembly 10 can be released, and the pressure medium in the pressure control assembly 10 is prevented from affecting the normal operation of the negative pressure source communicated with the second pressure communication port 120, thereby improving the safety and stability of the operation of the pressure controller.

It should be noted that, on the basis that the opening pressure is greater than 0kPa, the greater the opening pressure of the passage protection valve 30, the weaker the protection of the negative pressure source and the second pressure communication port 120, and the smaller the opening pressure of the passage protection valve 30, the stronger the influence on the negative pressure source and the second pressure communication port 120, and meanwhile, in order not to affect the normal operation of the switching mechanism 20 and the negative pressure source, the opening pressure of the passage protection valve 30 needs to be less than or equal to the maximum bearing pressure of the switching mechanism 20 or the maximum bearing pressure of the negative pressure source, so as to protect the switching mechanism 20 and the negative pressure source from being damaged by the high pressure medium. Illustratively, the opening pressure of the passage protection valve 30 may be any one of 0-10kPa, such as 2kPa, 3kPa, etc., and when pressure data is detected to reach the opening pressure, i.e., the passage protection valve 30 is controlled to open, protection is provided to the pressure control assembly 10.

In another embodiment of the present application, the passage protection valve 30 may be a check valve, the valve output end of the check valve is connected to the third pressure communication port 130, so that the valve output end of the passage protection valve is connected to the atmosphere through the third pressure communication port 130, and the check valve is used for being conducted when the pressure of the valve input end is greater than the pressure of the valve output end. The passage protection valve 30 is provided with a check valve, and can be turned on when the pressure at the input end of the check valve is greater than that at the output end, so that the high-pressure medium is discharged to the atmosphere through the third pressure communication port 130, the influence of the high-pressure medium in the pressure control assembly 10 on the pressure controller is reduced, and the operation stability is improved.

It should be appreciated that when a relief valve is used as the passage protection valve 30, an opening pressure needs to be set for the relief valve, and when the relief valve detects that the pressure value in the pressure control assembly 10 reaches the opening pressure, the relief valve is conducted, thereby providing protection for the negative pressure source. When the check valve is used as the passage protection valve 30, the pressure can be released when the pressure value in the pressure controller is greater than the external atmospheric pressure, and the pressure medium can be discharged without additional control.

In some embodiments of the present application, in order to detect the pressure medium after pressure control when the pressure control assembly 10 controls pressure, as shown in fig. 4, the pressure controller further includes a first reference pressure measuring module 310 and a second reference pressure measuring module 320 to detect the pressure medium after pressure control by the pressure control assembly 10. The first reference pressure measuring module 310 is connected to the output end of the pressure control assembly 10 through the first measuring branch 311, and the second reference pressure measuring module 320 is connected to the output end of the pressure control assembly 10 through the second measuring branch 321.

The maximum value of the measuring range of the first reference pressure measuring module 310 is larger than the maximum value of the measuring range of the second reference pressure measuring module 320, and/or the minimum value of the measuring range of the first reference pressure measuring module 310 is smaller than the minimum value of the measuring range of the second reference pressure measuring module 320, so that the measuring range of the first reference pressure measuring module 310 is larger than the measuring range of the second reference pressure measuring module 320, and further, if the accuracy levels of the first reference pressure measuring module 310 and the second reference pressure measuring module 320 are the same, the measuring deviation of the second reference pressure measuring module 320 is smaller. In some embodiments of the present application, the second measurement branch 321 is provided with a first stop valve 322, and the first stop valve 322 is used for controlling the on-off between the second measurement branch 321 and the pressure control assembly 10.

For example, when the pressure measurement is performed, the first stop valve 322 is in a closed state, at this time, the pressure medium may be first conveyed to the first reference pressure measuring module 310 through the first measurement branch 311 for measurement, and if the measured medium pressure is within the range of the second reference pressure measuring module 320, the first stop valve 322 is controlled to be switched to an open state, so that the pressure medium is conveyed to the second reference pressure measuring module 320 through the second measurement branch 321 for pressure measurement, thereby obtaining a pressure measurement result with higher accuracy, and improving the accuracy of the pressure measurement result. After the pressure value is obtained, the pressure value is compared with the target pressure value, and whether the generated pressure value is consistent with the target pressure value or not can be judged.

If the measured medium pressure is outside the range of the second reference pressure measuring module 320, the measured result of the first reference pressure measuring module 310 may be recorded as a pressure value, and whether the measured result matches the target pressure value may be determined, so as to obtain a pressure generating result.

In some embodiments, the first reference pressure measuring module 310 and the second reference pressure measuring module 320 can be controlled to measure the pressure simultaneously, and when the pressure value exceeds the measuring range of the second reference pressure measuring module 320, the first stop valve 322 interrupts the second measuring branch 321 to avoid damage to the second reference pressure measuring module 320 caused by excessive pressure. When the pressure value does not exceed the measuring range of the second reference pressure measuring module 320, two measurement results are 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, so as to obtain the current pressure value, and the current pressure value is compared with the target pressure value.

The pressure medium after the pressure control of the pressure control assembly 10 can be measured through the first reference pressure measuring module 310 and the second reference pressure measuring module 320, so that a pressure result is obtained, and the working state of the pressure controller is monitored, so that the pressure controller always outputs the pressure medium meeting the target pressure value. It should be understood that the results obtained by measuring the first reference pressure measuring module 310 and the second reference pressure measuring module 320 may be the gauge pressure, the absolute pressure, or the gauge pressure, or the absolute pressure, and the form of the results obtained by measuring the first reference pressure measuring module 310 and the second reference pressure measuring module 320 is not limited in the present application.

As shown in fig. 4, the pressure controller may further include a third reference pressure measuring module 330, the third reference pressure measuring module 330 being in communication with the third measuring branch 331, and the third measuring branch 331 being connected to one of the atmospheric input ports, thereby measuring the atmospheric pressure of the current environment. In some embodiments, the third reference pressure measurement module 330 may be disposed at one side between the third pressure communication port 130 and the switching mechanism 20 through the third measurement branch 331, thereby detecting the atmospheric pressure. It should be noted that, the result obtained by the third reference pressure measurement module 330 may be used to perform gauge pressure and absolute pressure conversion on the result obtained by the measurement of the first reference pressure measurement module 310 and the second reference pressure measurement module 320, so that the user may obtain the desired pressure detection data.

As shown in fig. 4, in order to regulate the pressure medium output by the pressure source, so as to obtain the pressure medium that meets the target pressure value, the pressure control assembly 10 includes a first pressure control branch 11 and a second pressure control branch 12, where the first pressure communication port 110 is communicated with the pressure output port 100 through the first pressure control branch 11, and the first pressure control branch 11 is used for controlling the positive pressure. One end of the second pressure control branch 12 is communicated with the pressure output port 100, the other end of the second pressure control branch 12 is communicated with the switching mechanism 20, and when the switching mechanism 20 is in a first switching state, the second pressure control branch 12 is communicated with the second pressure communication port 120 so as to control negative pressure; in the second switching state of the switching mechanism 20, the second pressure control branch 12 communicates with the third communication port 130 to control the atmospheric pressure.

Further, in order to realize control of the pressure medium, the first pressure control branch 11 may be provided with a first pressure control valve 111, where the first pressure control valve 111 is disposed between the pressure output port 100 and the first pressure communication port 110 and is used to control the pressure medium flowing through the first pressure control branch 11, and the first pressure control valve 111 can regulate and control the pressure rising amplitude of the pressure output port 100 by adjusting the opening degree and/or on-off, so that the pressure of the pressure output port 100 is controllably raised and approaches or even reaches the target pressure value.

The first pressure control branch 11 may further include a first pressure control measurement module 112, and specifically, the first pressure control measurement module 112 is disposed on a side of the first pressure control valve 111, where the side is communicated with the first pressure communication port 110, so as to detect a pressure medium input into the first pressure control branch 11, and cooperate with adjusting an opening of the first pressure control valve 111 to realize accurate control of the input positive pressure.

Similarly, the second pressure control branch 12 may be provided with a second pressure control valve 121, a first valve passage end of the second pressure control valve 121 is communicated with the pressure output port 100, a second valve passage end of the second pressure control valve 121 is communicated with the switching mechanism 20, the second pressure control valve can control on-off between the second pressure control branch 121 and the pressure output port 100, it should be understood that the structures of the first pressure control valve 111 and the second pressure control valve 121 may be the same, and the second pressure control valve 121 may also regulate and control the medium pressure in the second pressure control branch 12 by adjusting the opening degree, so as to achieve a pressure control effect; the opening degree of the second pressure control valve 121 is adjusted, so that the pressure reduction amplitude of the pressure output port 100 can be regulated, and the pressure of the pressure output port 100 can be controllably reduced and approaches or even reaches the target pressure value, and the first pressure control branch 11 and the second pressure control branch 12 are mutually matched, so that the pressure of the pressure output port 100 can be stabilized at the target pressure value.

Further, a second pressure control measurement module 122 may be further disposed on the second pressure control branch 12, specifically, the second pressure control measurement module 122 is disposed on one side of the second pressure control valve 121 where the second pressure control valve 121 is communicated with the switching mechanism 20, so as to detect the pressure medium input into the second pressure control branch 12, and control the input negative pressure or atmospheric pressure by matching with the opening degree of the second pressure control valve 121.

The valve input end of the passage protection valve 30 in the pressure controller is communicated between the second valve passage end of the second pressure control valve 121 and the switching mechanism 20 on the basis of the provision of the second pressure control branch 12 and the second pressure control valve 121 in the pressure controller. By arranging the pressure control branch (the first pressure control branch 11 and the second pressure control branch 12) and the pressure control valve (the first pressure control valve 111 and the second pressure control valve 121) in the pressure control assembly 10, the flow amount of the pressure medium can be controlled, the purpose of controlling the pressure of the medium is achieved, and the output pressure of the pressure controller meets the requirement of the pressure target value.

In some embodiments of the present application, as shown in fig. 4, the pressure control assembly 10 may further include a pressure chamber 13, where the pressure chamber 13 is disposed in the pressure control assembly 10, and one end of the pressure chamber 13 is in communication with the pressure output port 100. The pressure cavity 13 can receive the pressure medium generated by the first pressure control branch 11 and the second pressure control branch 12, so as to obtain a summarized pressure medium, and under the condition that the pressure controller operates normally, the stable pressure value in the pressure cavity 13 should be the same as the target pressure value of the pressure controller. In some embodiments, the pressure chamber 13 is also in communication with the first measuring branch 311 and with the second measuring branch 321 when the first shut-off valve 322 is in the open state, so as to provide the first measuring branch 311 and the second measuring branch 321 with the pressure medium required for the measurement.

Illustratively, the pressure controller further includes a pressure relief line 40, an input end of the pressure relief line 40 is connected to an output end of the pressure control assembly 10, and an output end of the pressure relief line 40 is connected to the atmosphere. Further, the pressure relief pipeline 40 is provided with a pressure relief valve 41, and the pressure relief valve 41 is used for controlling the on-off of the pressure relief pipeline 40, thereby controlling the pressure relief time of the pressure relief pipeline 40.

In some embodiments, the input end of the pressure release pipeline 40 may be communicated with the pressure cavity 13, so that in the scenario that impurities exist in the pressure medium of the pressure control assembly 10 or a target pressure value is changed, the pressure release valve 41 is opened to conduct the pressure release pipeline 40 with the pressure cavity 13, so that the pressure medium is released, and the influence of the impurities in the pressure medium on the pressure controller is reduced, for example, the pressure at the input end of the pressure control assembly 10 is too high, and before the switching mechanism 20 is switched to a first switching state, so that the second input end of the pressure control assembly 10 is communicated with a negative pressure source, the impurities such as greasy dirt in the pressure controller are firstly discharged to the outside through the pressure release pipeline 40, and the influence of the impurities in the pressure controller on the pressure control efficiency and accuracy is reduced.

Wherein, can set up the greasy dirt container at the output of pressure release pipeline 40, this greasy dirt container sets up in the outside of pressure controller to reduce the occupation to pressure controller inner space.

In addition, when the pressure at the output end of the pressure control assembly 10 is higher than the target pressure value and the difference between the pressure control assembly and the target pressure value is larger, the pressure at the output end of the pressure control assembly 10 can be released through the pressure release pipeline 40, so that the pressure at the output end of the pressure control assembly 10 is rapidly reduced, and the working efficiency of the pressure controller is improved.

In some embodiments of the present application, in order to realize control over the pressure controller, as shown in fig. 5, the pressure controller further includes a main control module 50, where the main control module 50 may be configured with devices such as the switching mechanism 20, the first reference pressure measurement module 310, the second reference pressure measurement module 320, the third reference pressure measurement module 330, the first stop valve 322, the first pressure control measurement module 112, the second pressure control measurement module 122, the pressure release valve 41, the first pressure control valve 111, and the second pressure control valve 121.

During operation of the pressure controller, each module may generate a pressure corresponding to the target pressure value under the control of the main control module 50, and the pressure controller may output a pressure medium with a pressure ranging from 2MPa to-30 kPa, for example, by using gauge pressure data, and it should be understood that the control pressure range of the pressure controller is only one example, and the output pressure of the pressure controller is not limited in the present application.

At this time, the maximum output pressure of the positive pressure source connected with the pressure controller needs to be larger than 2MPa, and the maximum output pressure of the negative pressure source needs to be smaller than-30 kPa, so that the pressure controller can output pressure medium in the range of 2MPa to-30 kPa. In this example, the range of the first reference pressure measurement module 310 is 0-7MPa, the range of the second reference pressure measurement module 320 is-100 kPa, it should be understood that the ranges of the two reference pressure measurement modules can cover the output pressure range of the pressure controller, and the range of the reference pressure measurement modules is not limited in the present application.

The following describes the operation of the pressure controller by taking a gauge pressure detection process as an example:

the main control module 50 obtains the target pressure value of 2MPa, and at this time, the main control module 50 sends a signal to the switching mechanism 20 to make the switching mechanism 20 in the second switching state, and then controls the first stop valve 322 to be closed, so as to interrupt the communication state between the pressure control assembly 10 and the second reference pressure measuring module 320. The master control module 370 then obtains the current pressure value from the first reference pressure measuring module 310, obtains the first input pressure value from the first pressure control measuring module 112, and obtains the second input pressure value from the second pressure control measuring module 122, wherein the first reference pressure measuring module 310 is communicated with the pressure cavity 13, and the pressure cavity 13 is further communicated with the pressure output port 100, so the current pressure value may represent the current value of the output pressure, the first input pressure value may be equivalent to the value of the pressure input by the positive pressure source because the first pressure control measuring module 112 is communicated with the first pressure communication port 110, and the third pressure communication port 130 is further communicated with the environmental reference pressure (atmosphere) because the second pressure control measuring module 122 is communicated with the third pressure communication port 130, so the second input pressure value may be equivalent to the gauge pressure zero point.

The main control module 370 generates control signals according to the current pressure value and the first target pressure value, and controls the first pressure control valve 111 and the second pressure control valve 121 respectively, further, the opening degree of the first pressure control valve 111 may be controlled more finely according to the first input pressure value, the opening degree of the second pressure control valve 121 may be controlled more finely according to the second input pressure value, and the general pressure control principle includes that the current pressure value may be raised by opening the first pressure control valve 111 due to the fact that the first input pressure value is greater than the target pressure, the current pressure value may be lowered by opening the second pressure control valve 121 due to the fact that the second input pressure value is less than the target pressure, the larger the pressure difference value (the difference between the current pressure value and the input pressure value) is, the larger the opening amplitude (including at least one of the opening drift diameter and the opening time ratio) of the valve is, the larger the current pressure value may be caused to be even stabilized to the target pressure value based on the above pressure control principle, and it may be understood that the current pressure value may be stabilized to be substantially within a small range (e.g. within a small range of accuracy) meeting the requirement of the target pressure.

If the current pressure value reaches 2MPa, the pressure controller is indicated to adjust the output pressure to be the same as the target pressure value, and pressure supply or other operations can be performed.

Illustratively, after the current pressure value reaches 2MPa, the target pressure value is changed to-30 kPa, and the main control module 50 needs to control the output pressure to decrease from 2 MPa. In the process of reducing the output pressure, in the first stage, the switching communicating posture of the switching mechanism 20 is kept unchanged, the first pressure control valve 111 is closed, the second pressure control valve 121 is opened, the pressure medium is rapidly discharged from the third pressure communication port 130, so that the current pressure value continuously reduces, further, if the pressure medium contains pollution impurities such as greasy dirt, the pressure release valve 41 can be opened, the greasy dirt is discharged into a special external greasy dirt container through the pressure release pipeline 40, if the external greasy dirt container is also communicated with the atmosphere, the operation can further accelerate the depressurization rate, when the current pressure value reaches a set threshold value, for example, 10kPa, the set threshold value can be set according to the maximum bearing pressure of the negative pressure source, at this time, the possible greasy dirt and other pollutants are basically discharged by the previous depressurization process, the main control module 50 sends a control signal to the switching mechanism 20, the switching mechanism 20 adjusts the switching state to the first switching state, so that the second pressure communication port 120 is communicated with the pressure control component 10, the third pressure communication port 130 is communicated with the pressure control component 10, the depressurization rate can be further accelerated, the second input pressure value can be equal to the first pressure value, the opening degree of the second pressure value can be equal to the second pressure value initially, and the opening degree of the first pressure control valve 111 can reach the opening degree of the output through the first pressure control valve 121.

Corresponding to the foregoing embodiments of the pressure controller, the present application also provides a pressure control system comprising: the positive pressure source is used for providing positive pressure; the negative pressure source is used for providing negative pressure; any one of the pressure controllers is provided with a first pressure communication port 110, a second pressure communication port 120, a third pressure communication port 130 and a pressure output port 100, wherein the first pressure communication port 110 is communicated with a positive pressure source, the second pressure communication port 120 is communicated with a negative pressure source, the third pressure communication port 130 is communicated with the atmosphere, and the pressure output port 100 is communicated with a pressure instrument to be detected. By arranging the switching mechanism 20 in the pressure controller, the frequency of dismounting the negative pressure source in the operation process of the pressure control system is reduced, and the operation efficiency of the pressure control system is improved.

As can be seen from the above technical solution, the present application provides a pressure controller including a pressure output port 100, a pressure control assembly 10, a switching mechanism 20, a first pressure communication port 110, a second pressure communication port 120, and a third pressure communication port 130, wherein the pressure output port 100 is configured to output a controlled pressure, the output end of the pressure control assembly 10 is communicated with the pressure output port 100, the first pressure communication port 110 is communicated with a positive pressure source, the second pressure communication port 120 is communicated with a negative pressure source, the third pressure communication port 130 is communicated with the outside atmosphere, and the switching mechanism 20 can switch the connection relationship between the second pressure communication port 120 and the third pressure communication port 130 and the pressure control assembly 10 so as to provide different pressure mediums for the pressure control assembly 10. Through setting up third pressure communication port 130 and shifter 20, when carrying out pressure control, can switch second pressure communication port 120 and third pressure communication port 130, for example, under one switching mode, provide pressure for the accuse pressure subassembly through positive pressure source and negative pressure source, under another switching mode, provide pressure for the accuse pressure subassembly through positive pressure source and outside atmosphere, frequent change pressure source when avoiding satisfying different target pressure value demands, improve pressure controller's confession pressure efficiency.

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 (10)

1. A pressure controller, comprising:

a pressure output port for outputting the controlled pressure;

the pressure control assembly is used for controlling pressure medium flowing through, and the output end of the pressure control assembly is communicated with the pressure output port;

the first pressure communication port is used for communicating with a positive pressure source and is communicated with the first input end of the pressure control assembly so as to provide positive pressure for the pressure control assembly;

the second pressure communication port is used for communicating a negative pressure source;

a third pressure communication port for communicating with the outside atmosphere;

the switching mechanism comprises a switchable first switching state and a second switching state, and in the first switching state, the second pressure communication port is communicated with the second input end of the pressure control assembly through the switching mechanism so as to provide negative pressure for the pressure control assembly; in the second switching state, the third pressure communication port is communicated with the second input end of the pressure control assembly through the switching mechanism so as to provide atmospheric pressure for the pressure control assembly.

2. The pressure controller of claim 1, further comprising:

the valve input end of the passage protection valve is communicated with the second input end of the pressure control assembly, and the valve output end of the passage protection valve is communicated with the atmosphere;

the passage protection valve is used for being conducted when the pressure of the pressure control assembly reaches a preset pressure so as to reduce the pressure of the pressure control assembly.

3. The pressure controller according to claim 2, wherein the passage protection valve is a relief valve, a cracking pressure of the passage protection valve is equal to the preset pressure, and the cracking pressure is greater than 0kPa;

the opening pressure of the safety valve is smaller than or equal to the maximum bearing pressure of the switching mechanism, or the opening pressure of the passage protection valve is smaller than or equal to the maximum bearing pressure of the negative pressure source.

4. The pressure controller according to claim 2, wherein a valve output end of the passage protection valve is communicated with the third pressure communication port so that the valve output end of the passage protection valve is communicated with the atmosphere through the third pressure communication port;

The check valve is configured to conduct when the pressure at the valve input is greater than the pressure at the valve output.

5. The pressure controller of claim 1, wherein the switching mechanism comprises a three-way valve comprising a valve chamber and a valve spool, the valve chamber having a first port, a second port, and a third port, the first port being in communication with the second input of the pressure control assembly, the second port being in communication with the second pressure communication port, the third port being in communication with the third pressure communication port;

the valve core moves in the valve cavity, and in the first switching state, the valve core is plugged on the third port, the first port is communicated with the second port, and the first port is disconnected from the third port; in the second switching state, the valve core is plugged at the second port, the first port is communicated with the third port, and the first port is disconnected from the second port;

or the switching mechanism comprises a first two-way valve and a second two-way valve which are connected in parallel, wherein the valve input ends of the first two-way valve and the second two-way valve are both communicated with the second input end of the pressure control assembly, the valve output end of the first two-way valve is communicated with the second pressure communication port, the valve output end of the second two-way valve is communicated with the third pressure communication port, and in the first switching state, the first two-way valve is switched on, and the second two-way valve is switched off; in the second switching state, the first two-way valve is turned off and the second two-way valve is turned on.

6. The pressure controller of claim 1, further comprising a first reference pressure measurement module and a second reference pressure measurement module;

the first reference pressure measuring module is communicated with the output end of the pressure control assembly through a first measuring branch, and the second reference pressure measuring module is communicated with the output end of the pressure control assembly through a second measuring branch; a first stop valve is arranged on the second measurement branch and is used for controlling the on-off of the second measurement branch;

the maximum value of the measuring range of the first reference pressure measuring module is larger than the maximum value of the measuring range of the second reference pressure measuring module, and/or the minimum value of the measuring range of the first reference pressure measuring module is smaller than the minimum value of the measuring range of the second reference pressure measuring module.

7. A pressure controller according to any one of claims 1-6, wherein the pressure control assembly comprises:

the first pressure control branch is communicated with the pressure output port through the first pressure control branch, and the first pressure control branch is used for controlling positive pressure;

one end of the second pressure control branch is communicated with the pressure output port, the other end of the second pressure control branch is communicated with the switching mechanism, and in the first switching state, the second pressure control branch is communicated with the second pressure communication port so as to control negative pressure; and in the second switching state, the second pressure control branch is communicated with the third pressure communication port so as to control the atmospheric pressure.

8. The pressure controller of claim 7, wherein a second pressure control valve is arranged on the second pressure control branch, a first valve passage end of the second pressure control valve is communicated with the pressure output port, a second valve passage end of the second pressure control valve is communicated with the switching mechanism, and the second pressure control valve is used for controlling the on-off of the second pressure control branch;

and the valve input end of the passage protection valve in the pressure controller is communicated between the second valve passage end of the second pressure control valve and the switching mechanism.

9. The pressure controller of any one of claims 1-6, further comprising:

the pressure relief pipeline, the input of pressure relief pipeline communicate in the output of accuse pressure subassembly, the output of pressure relief pipeline communicates in the atmosphere, be equipped with the relief valve on the pressure relief pipeline, the relief valve is used for controlling the break-make of pressure relief pipeline.

10. A pressure control system, comprising:

a positive pressure source for providing a positive pressure;

the negative pressure source is used for providing negative pressure;

the pressure controller of any one of claims 1-9, provided with a first pressure communication port that communicates with the positive pressure source, a second pressure communication port that communicates with the negative pressure source, a third pressure communication port that communicates with the atmosphere, and a pressure output port that communicates with a pressure gauge to be tested.