Pressure zero return device, connection device, calibration system and pressure automatic zero return method

Abstract

The present invention discloses a pressure return to zero device, a connection device, a calibration system and a pressure automatic return to zero method, which belongs to the technical field of pressure detection and calibration. The pressure return to zero device includes a first pipeline for communicating with a pressure source, and a pressure relief device for controlling the rapid pressure relief of the first pipeline, the pressure relief device includes a second pipeline for communicating with the first pipeline, a third pipeline and an electric control valve for automatically controlling the opening and closing of the second pipeline and the third pipeline, the electric control valve can automatically control the connection of the second pipeline and the third pipeline through a predetermined instruction, and connect the first pipeline to the atmosphere through the third pipeline and the second pipeline, so as to realize the automatic pressure relief of the pressure in the first pipeline until it returns to zero.

Description

Technical Field

[0001] The present invention belongs to the technical field of pressure detection and calibration, and in particular relates to a pressure zero return device, a pressure connection device, a pressure calibration system and a pressure automatic zero return method. Background Art

[0002] When calibrating a detection device (such as a pressure gauge, a transmitter, etc.), the detection device is usually connected to a pressure generating device (such as a pressure controller) through a pipeline. During the calibration process, the pressure generating device inputs a pressure fluid (gas or liquid) into the pipeline.

[0003] After the verification is completed, the pressure generating device stops inputting pressure fluid into the pipeline, and the pressure fluid in the pipeline flows back to the pressure generating device to relieve pressure. However, due to the high pressure in the pipeline, the process of returning to zero pressure from the pressure in the pipeline to the ambient pressure takes a long time. In the related technology, a rotary valve that can be connected to the atmosphere is set on one side of the pipeline to be tested. When the pipeline is depressurized, the verification personnel manually open the rotary valve to reduce the time spent on the pressure return to zero process.

[0004] However, this method of manually opening the rotary valve to connect to the atmosphere and returning to zero requires manual control by the calibration personnel, and the degree of automation is not high. Summary of the invention

[0005] The invention provides a pressure zero return device, a connecting device, a calibration system and a pressure automatic zero return method, which can realize automatic control of the pressure zero return process.

[0006] One aspect of the present invention provides a pressure return to zero device, comprising:

[0007] A connecting seat 1, which is provided for connecting a first pipeline 11 to a pressure source;

[0008] A pressure relief device 2, which is arranged on the connecting seat 1, includes a second pipeline 20 and a third pipeline 21 that are connected to each other, and an electric control valve 22 for controlling the second pipeline 20 and the third pipeline 21 to be connected or disconnected; wherein the second pipeline 20 and the third pipeline 21 are connected through a cavity 213, the second pipeline 20 is connected to the first pipeline 11, and the third pipeline 21 is connected to or disconnected from the atmosphere;

[0009] The electric control valve 22 includes a ball 223, which is movably arranged in the cavity 213. The ball 223 can block the top of the cavity 213 upward, and the diameter of the ball 223 is smaller than the inner diameter of the cavity 213. The electric control valve 22 controls the ball 223 to move in the cavity 213 in response to a control instruction, so that the second pipeline 20 is connected or disconnected with the third pipeline 21.

[0010] Optionally, the electric control valve 22 also includes an electromagnet 221 and a push pin 222, wherein the push pin 222 is connected to the electromagnet 221, and the electromagnet 221 actuates in response to the power-on state, and the push pin 222 moves synchronously with the electromagnet 221 to push the ball 223 to move in the cavity 213 to connect or disconnect the second pipeline 20 with the third pipeline 21.

[0011] Optionally, the electric control valve 22 also includes an electromagnet 221, a pin 222 and an elastic member 224, the pin 222 is connected to the electromagnet 221, the elastic member 224 is arranged below the sphere 223 in the cavity 213, and the sphere 223 blocks the cavity 213 in response to the action of the elastic member 224; the electromagnet 221 can move in response to the power-on state, and the pin 222 moves synchronously with the electromagnet 221 to push the sphere 223 to move in the cavity 213 to connect or disconnect the second pipeline 20 with the third pipeline 21.

[0012] Optionally, a concave surface is provided at the connection port between the cavity 213 and the third pipeline 21, and the concave surface matches the sphere 223. When the sphere 223 fits against the concave surface, the second pipeline 20 is disconnected from the third pipeline 21; when the sphere 223 is separated from the concave surface, the second pipeline 20 is connected to the third pipeline 21.

[0013] Optionally, the pressure return to zero device further includes a pressure relief device connector 23 , which is disposed on the connection seat 1 , the pressure relief device 2 is connected to the pressure relief device connector 23 , and one end of the second pipeline 20 is disposed in the pressure relief device connector 23 .

[0014] Optionally, the pressure return to zero device further includes a liquid storage box 3 , which is arranged below the connecting seat 1 , and the liquid discharged from the third pipeline 21 flows into the liquid storage box 3 .

[0015] Optionally, the first pipeline 11 has an input port 111 and an output port 112, wherein the input port 111 is used to connect to a pressure generating device, and the output port 112 is used to connect to a detected device.

[0016] On the other hand, the present invention provides a pressure connecting device, which includes a pressure detection module 5, a pressure connecting head 4 and the above-mentioned pressure return device. The pressure connecting head 4 is arranged on the connecting seat 1 of the pressure return device and is connected to the first pipeline 11. The pressure detection module 5 is connected to the pressure connecting head 4.

[0017] On the other hand, the present invention also provides a pressure calibration system, which includes a pressure generating device, a pressure connecting platform 6 for connecting the device to be tested, and the above-mentioned pressure connecting device, wherein a first pipeline 11 having an input port 111 and an output port 112 is provided on the pressure return device on the pressure connecting device, wherein the input port 111 is connected to the pressure generating device, and the output port 112 is connected to the pressure connecting platform 6.

[0018] Another aspect of the present invention further provides a method for automatically returning pressure to zero, the method using the above-mentioned pressure return to zero device, the method comprising:

[0019] When performing the pressure calibration task, the electric control valve 22 is powered off, the ball 223 blocks the top of the cavity 213, and the second pipeline 20 is disconnected from the third pipeline 21;

[0020] After the pressure check is completed, after detecting that the pressure value in the first pipeline 11 reaches the set pressure value, the electric control valve 22 is energized to push the ball 223 to move in the cavity 213 to connect the second pipeline 20 with the third pipeline 21, and the first pipeline 11 is connected to the atmosphere through the third pipeline 21 and the second pipeline 20, and the pressure in the first pipeline 11 is relieved until the pressure returns to zero.

[0021] The pressure return to zero device provided based on the above technical solution is provided with a connecting seat for a first pipeline connected to a pressure source, and a pressure reliever arranged on the connecting seat for automatically and quickly releasing pressure in the first pipeline. The pressure reliever includes a second pipeline and a third pipeline connected to the first pipeline and an electric control valve for controlling the on and off of the second pipeline and the third pipeline. The on and off power states of the electric control valve are controlled by control instructions to automatically control the on and off of the second pipeline and the third pipeline, and then the first pipeline is connected to the atmosphere through the third pipeline and the second pipeline when necessary, so that the pressure in the first pipeline is automatically and quickly released to zero, and the time consumption of the pressure return to zero process is reduced. Therefore, the pressure return to zero device provided by the present invention has a high degree of automation and can avoid the inconvenience caused by manual control of pressure relief.

[0022] The pressure connection device, pressure calibration system and automatic pressure zeroing method provided by the present invention all use the above-mentioned pressure zeroing device, which can improve the degree of automation control of the existing pressure calibration system. Through the automatic control function of the electric control valve arranged in the pressure zeroing device, precise control of ventilation and drainage in the pipeline and automatic pressure zeroing without human intervention can be achieved, effectively improving the automatic zeroing capability of the fluid (especially liquid) in the pressure calibration pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of a pressure relief device in a pressure return device provided by an embodiment of the present invention;

[0024] Figure 2 A schematic structural diagram of a pressure relief device in a pressure return device provided by another embodiment of the present invention;

[0025] Figure 3 A schematic structural diagram of a pressure connection device provided by an embodiment of the present invention;

[0026] Figure 4 for Figure 3 A schematic diagram of a longitudinal cross-sectional structure of a pressure connection device is provided;

[0027] Figure 5 A schematic diagram of the structure of a pressure calibration system provided by one embodiment of the present invention;

[0028] The figures in the figures represent:

[0029] 1: connection seat; 11: first pipeline; 111: input port; 112: output port;

[0030] 2: pressure relief device; 20: second pipeline; 21: third pipeline; 211: first interface; 212: second interface; 213: cavity; 22: electric control valve; 221: electromagnet; 222: ejector pin; 223: ball; 224: elastic member; 23: pressure relief device connector;

[0031] 3: Liquid storage box;

[0032] 4: Pressure connector;

[0033] 5: Pressure detection module;

[0034] 6: Pressure connection platform. DETAILED DESCRIPTION

[0035] The present invention provides a pressure zero return device which can be used for automatic control in a pressure detector or a pressure calibration system, so as to improve the degree of automatic control of the pressure detection and calibration system as a whole.

[0036] In one embodiment, the present invention provides a pressure return to zero device, such as Figure 3 and Figure 4 As shown, a schematic diagram of the structure of the pressure return to zero device is shown, and it can be seen that the pressure return to zero device includes:

[0037] The connection base 1 is provided with a first pipeline 11; the first pipeline 11 may have an input port 111 and an output port 112, wherein the input port 111 is used to connect to a pressure generating device, and the output port 112 is used to connect to a pressure connection station (see Figure 5 );

[0038] The pressure relief device 2 is arranged on the connection seat 1, and is combined with Figure 1 and Figure 2 , including a second pipeline 20 and a third pipeline 21 that are interconnected, and an electric control valve for controlling the on-off of the second pipeline 20 and the third pipeline 21; wherein a cavity 213 is provided between the second pipeline 20 and the third pipeline 21, the second pipeline 20 is connected to the first pipeline 11, and the third pipeline 21 is connected to the atmosphere.

[0039] In the embodiment of the present invention, the pressure relief device 2 can adopt two structures to control the fluid pressure in the first pipeline 11 to return to zero.

[0040] A structure of the pressure relief device 2 is as follows Figure 1 As shown, the electric control valve 22 in the pressure relief device 2 includes an electromagnet 221, a pin 222 and a ball 223. The ball 223 is movably arranged in the cavity 213. The ball 223 can move in the cavity 213 in response to the power-on state of the electric control valve. The pin 222 is connected to the electromagnet 221. The electromagnet 221 can move in response to the power-on state. The pin 222 moves synchronously with the electromagnet 221 to push the ball 223 to move in the cavity 213 and detach from the top of the cavity 213, thereby controlling the second pipeline 20 to be connected with the third pipeline 21. In this way, the pressure relief device 2 can, when needed, flow from the second interface 212 connecting the atmosphere and the third pipeline 21 through the third pipeline 21 and the second pipeline 20 to the first pipeline 11 (combined with the pressure relief device 20) according to the predetermined instructions. Figure 4 ) to release the pressure of the pressure fluid in the first pipeline 11 back to zero.

[0041] Another structure of the pressure relief device 2 is as follows Figure 2 As shown, in Figure 1 An elastic member 224 is provided below the sphere 223 in the cavity 213 shown. The sphere 223 blocks the top of the cavity 213 under the elastic action of the elastic member 224, and the second pipeline 20 is disconnected from the third pipeline 21; the ejector pin 222 is connected to the electromagnet 221, and the electromagnet 221 can be actuated in response to the power-on state. The ejector pin 222 moves synchronously with the electromagnet 221 to push the sphere 223 to move in the cavity 213 and detach from the top of the cavity 213, and the second pipeline 20 is connected with the third pipeline 21, so that the pressure relief device 2 can connect the first pipeline 11 to the atmosphere through the third pipeline 21 and the second pipeline 20 from the second interface 212 according to the instruction, and the pressure fluid in the first pipeline 11 is depressurized to zero.

[0042] like Figure 3 and Figure 4 As shown, the present invention also provides a pressure connection device, which includes a pressure detection module 5, a pressure connection head 4 and a pressure return device. The pressure connection head 4 is arranged on the connection seat 1 of the pressure return device and is connected to the first pipeline 11. The pressure detection module 5 is connected to the pressure connection head 4. The pressure relief device in the pressure return device can be Figure 1 and Figure 2 The structure shown is implemented.

[0043] like Figure 5 As shown, an embodiment of the present invention further provides a pressure calibration system, comprising a pressure generating device, a pressure connecting platform 6 for connecting a device to be tested (such as a pressure gauge, a pressure transmitter, etc.), and the above-mentioned pressure connecting device, wherein a first pipeline 11 having an input port 111 and an output port 112 is provided on the pressure return device on the pressure connecting device, wherein the input port 111 is connected to the pressure generating device, and the output port 112 is connected to the pressure connecting platform 6.

[0044] The embodiment of the present invention further provides a method for automatically returning pressure to zero during pressure calibration. The method uses the pressure return to zero device provided by the embodiment of the present invention. The method includes:

[0045] When performing the pressure calibration task, the electric control valve 22 is powered off, the ball 223 blocks the top of the cavity 213, and the second pipeline 20 is disconnected from the third pipeline 21;

[0046] After the pressure check is completed and the pressure value in the first pipeline 11 reaches the set pressure value, the electric control valve 22 is energized to push the ball 223 to move in the cavity 213 to connect the second pipeline 20 with the third pipeline 21, and connect the first pipeline 11 with the atmosphere through the third pipeline 21 and the second pipeline 20, and relieve the pressure in the first pipeline 11 until the pressure returns to zero.

[0047] The present invention will be described in more detail below in conjunction with the embodiments and drawings. Obviously, the embodiments will help to understand the present invention, but should not be regarded as limiting the present invention.

[0048] Embodiment 1:

[0049] Figure 1A schematic diagram of the structure of the pressure relief device 2 in the pressure return device provided in the embodiment, the pressure relief device 2 includes a pressure relief device body and a second pipeline 20 and a third pipeline 21 connected to each other arranged in the pressure relief device body, and an electric control valve 22 for controlling the on-off of the second pipeline 20 and the third pipeline 21, wherein the second pipeline 20 has a first interface 211 for connecting with the pipeline for pressure verification, and the third pipeline 21 has a second interface 212 for communicating with the atmosphere; and a cavity 213 is arranged between the second pipeline 20 and the third pipeline 21. The two ports of the cavity 213 are respectively communicated with the second pipeline 20 and the third pipeline 21. At the two ends of the cavity 213, the inner diameter of the cavity 213 is larger than the inner diameters of the second pipeline 20 and the third pipeline 21 connected thereto. Preferably, a concave surface recessed toward the third pipeline 21 is provided at the port connected to the third pipeline 21. The concave surface matches the sphere 223 provided in the cavity 213, which is beneficial for the sphere 223 to seal the pipeline. When the sphere 223 contacts the concave surface, the cavity 213 is blocked, thereby disconnecting the second pipeline 20 and the third pipeline 21. When the sphere 223 separates from the concave surface, the cavity 213 is opened (the diameter of the sphere 223 is smaller than the inner diameter of the cavity 213), thereby connecting the second pipeline 20 and the third pipeline 21. The electric control valve 22 may be a solenoid valve, including an electromagnet 221, a pin 222 and a sphere 223 (such as a steel ball), wherein the sphere 223 is located at the bottom of the cavity 213 due to its own gravity and a gap is maintained between the sphere 223 and the inner wall of the cavity 213, and the pin 222 is located between the electromagnet 221 and the sphere 223. The pin 222 is connected to the electromagnet 221, and a space is provided in the pressure relief device body to allow the two to move up and down. The longitudinal direction of the space should meet the requirement that when the pin 222 moves to the lowest end, the needle end of the pin 222 is slightly lower than the concave surface at the top of the cavity 213 (so as to be able to push against the sphere 223 located on the concave surface), and the outer diameter of the needle end of the pin 222 is smaller than the port diameter of the concave surface at the top of the cavity 213 (so as to keep the second pipeline 20 and the third pipeline 21 connected). The electromagnet 221 can move in response to the power-on state, and the ejector pin 222 moves synchronously with the electromagnet 221 to push the ball 223 downward, thereby controlling the connection between the second pipeline 20 and the third pipeline 21 .

[0050] During the working process of the pressure relief device 2, in the initial state of the pressure relief device, the self-weight of the ball 223 is located at the bottom of the cavity 213 and there is a gap between the ball 223 and the inner wall of the cavity 213, so the first interface 211 of the second pipeline 20 and the second interface 212 of the third pipeline 21 are connected, that is, the second pipeline 20 and the third pipeline 21 are in a normally connected state. When the pressure relief device is used for pressure calibration in a pressure calibration system, the first interface 211 is connected to the pressure calibration pipeline, and the ball 223 will move up to the top concave surface of the cavity 213 under the action of the pressurized fluid (liquid or gas) in the pressure calibration pipeline, thereby blocking the second pipeline 20 and the third pipeline 21, and preventing the pressure calibration pipeline from being connected to the outside atmosphere. After the pressure check is completed, the electromagnet 221 is energized, the electromagnet 221 is activated, and the ejector pin 222 is driven downward, thereby pushing open the sphere 223 located on the concave surface of the top of the cavity 213, thereby connecting the second pipeline 20 and the third pipeline 21, so that the first interface 211 connected to the pressure check pipeline is connected to the second interface 212, and the external gas entering from the second interface 212 enters the pressure check pipeline through the third pipeline 21 and the second pipeline 20, so that the fluid in the pipeline quickly flows back, and the pressure is quickly relieved to achieve the purpose of returning to the zero state. After the pressure relief is completed, the electromagnet 221 is powered off, and the electromagnet 221 can drive the ejector pin 222 to reset, and the second pipeline 20 and the third pipeline 21 remain connected.

[0051] Embodiment 2:

[0052] Figure 2 Another structural schematic diagram of the pressure relief device 2 of the pressure return device provided in this embodiment, the structure of the pressure relief device provided in this embodiment is different from the structure of the pressure relief device provided in Example 1 in that the electric control valve 22 in the pressure relief device 2 provided in this embodiment also includes an elastic member 224 (such as a spring, etc.), which is arranged in the cavity 213 and located below the sphere 223, and the sphere 223 is located at the concave surface at the top of the cavity 213 in response to the elastic action of the elastic member 224, thereby blocking the second pipeline 20 and the third pipeline 21.

[0053] During the working process of the pressure relief device 2, in the initial state of the pressure relief device, the ball 223 is in close contact with the concave surface of the upper port of the cavity 213 under the elastic action of the elastic member 224, thereby blocking the second pipeline 20 and the third pipeline 21. At this time, the first interface 211 of the second pipeline 20 and the second interface 212 of the third pipeline 21 are not connected, that is, the second pipeline 20 and the third pipeline 21 are in a normally disconnected state. The first interface 211 is connected to the pressure test pipeline. Since the second pipeline 20 and the third pipeline 21 are in a disconnected state, the pressure of the fluid in the pressure test pipeline can be directly detected; after the pressure test is completed, the electromagnet 221 is energized, the electromagnet 221 is actuated, and the ejector pin 222 moves downward synchronously with the electromagnet 221, thereby pushing open the sphere 223 located on the concave surface of the top of the cavity 213 (at this time, the elastic member 224 is further compressed), thereby connecting the second pipeline 20 and the third pipeline 21, so that the first interface 211 connected to the pressure test pipeline is connected to the second interface 212, and the external gas entering from the second interface 212 enters the pressure test pipeline through the third pipeline 21 and the second pipeline 20, so that the fluid in the pipeline quickly refluxes, achieving the purpose of rapid pressure relief. After the pressure relief is completed, the electromagnet is powered off, and the ejector pin 222, the sphere 223 and the elastic member 224 are reset, so that the second pipeline 20 and the third pipeline 21 return to the disconnected state.

[0054] Embodiment 3:

[0055] Figure 3 The schematic diagram of the structure of the pressure return device provided in this embodiment is shown. It can be seen that the pressure return device includes a connection seat 1 and a pressure relief device 2 arranged on the connection seat 1. The pressure return device may also include a liquid storage box 3 arranged below the connection seat 1, and a pressure relief device connector 23 for connecting the pressure relief device 2. In this embodiment, the pressure relief device 2 can be implemented using the structure of the above-mentioned embodiment 1 or embodiment 2. A first pipeline 11 (see FIG. 1 ) for connecting to a pressure source (such as a device that generates pressure during pressure calibration) is provided in the connection seat 1. Figure 4 ), which has an input port 111 and an output port 112, the input port 111 is used to connect to a pressure generating device (such as a manual pressure source or an automatic intelligent pressure source), and the output port 112 is used to connect to a pressure connection platform 6, such as Figure 5 As shown, it is a schematic diagram of the structure in which the pressure return device is connected to the pressure connection platform 6 through the output port 112. A connector, such as a G1 / 4 external thread connector, can be provided on the output port 111 and the output port 112 to facilitate the connection of the input port 111 and the output port 112 with other devices. The pressure relief device 2 can be connected to the connection seat 1 through the pressure relief device connector 23 (when the pressure relief device connector 23 is not connected to the pressure relief device 2, the connector can be blocked by a blocking piece to prevent dust or other impurities from entering the connector).

[0056] When the first pipeline 11 is connected to a liquid pressure source, the second interface 212 of the third pipeline 21 can be connected to the liquid storage box 3 that is snapped together under the connecting seat 1 through another pipeline arranged on the outside of the pressure relief device 2. The fluid (especially liquid) remaining in the second pipeline 20 and the third pipeline 21 after the pressure verification work is completed can be discharged from the second interface 212 to the liquid storage box 3 to avoid splashing of residual liquid and contaminating the equipment.

[0057] Figure 4 for Figure 3 The longitudinal section structure diagram of the pressure return zero device shown in FIG. Figure 4 The middle pressure relief device 2 adopts the pressure relief device of Example 2. During the pressure verification process, the ball 223 in the pressure relief device 2 blocks the top of the cavity 213 under the elastic action of the elastic member 224, so that the second pipeline 20 and the third pipeline 21 are disconnected. The input port 111 of the first pipeline 11 is connected to a pressure generating device (such as a manual pressure source or an automatic intelligent pressure source), and the output port 112 is connected to a pressure connection platform, and a pressurized fluid is generated in the first pipeline 11 to perform the pressure verification task. After the pressure check is completed, the electromagnet 221 in the pressure relief device 2 is energized, and the electromagnet 221 responds to the energized state and moves, and the ejector pin 222 moves downward synchronously with the electromagnet 221, pushing the ball 223 to further compress the elastic member 224 and move downward so that the ball 223 is separated from the concave surface at the top of the cavity 213, and then the second pipeline 20 and the third pipeline 21 are connected through the cavity 213, and the atmosphere is introduced into the first pipeline 11 through the third pipeline 21 and the second pipeline 20, so that the fluid in the first pipeline 11 quickly flows back, and the purpose of returning the pressure to zero is achieved. The fluid (especially liquid) remaining in the second pipeline 20 and the third pipeline 21 can be discharged to the liquid storage box 3 through the second interface 212 of the third pipeline 21. During the pressure relief process after the pressure calibration is completed, a pressure detector connected to the pressure return device can be used to perform real-time detection of the fluid pressure in the first pipeline 11. When the pressure in the pipeline reaches the preset pressure value, the electromagnet 221 in the pressure relief device 2 is energized to connect the second pipeline 20 and the third pipeline 21, thereby achieving precise control of the electric control valve of the pressure relief device 2.

[0058] Embodiment 4:

[0059] The difference between the pressure return to zero device provided in this embodiment and the pressure return to zero device provided in embodiment 3 is that the pressure return to zero device provided in this embodiment adopts the pressure relief device 2 provided in embodiment 1. During the pressure verification process, the sphere 223 in the pressure relief device 2 is located at the bottom of the cavity 213 due to its own gravity and maintains a gap with the inner wall of the cavity 213, and the first interface 211 of the second pipeline 20 and the second interface 212 of the third pipeline 21 are in a connected state. After the input port 111 of the first pipeline 11 is connected to a pressure generating device (such as a manual pressure source or an automatic intelligent pressure source), and the output port 112 is connected to the pressure connection platform, a pressurized fluid is generated in the first pipeline 11, and the pressurized fluid pushes the sphere 223 to move upward to the top concave surface of the cavity 213 to block the cavity 213, thereby disconnecting the connection between the second pipeline 20 and the third pipeline 21, and then performing the pressure verification task. After the pressure check is completed, the electromagnet 221 in the pressure relief device 2 is energized, and the electromagnet 221 responds to the energized state and moves, and the ejector pin 222 moves downward synchronously with the electromagnet 221, pushing the ball 223 downward to leave the top concave surface of the cavity 213, unblocking the cavity 213, and then connecting the second pipeline 20 and the third pipeline 21, and introducing gas into the first pipeline 11 through the third pipeline 21 and the second pipeline 20, so that the fluid in the first pipeline 11 quickly flows back, and the purpose of returning the pressure to zero is achieved. The fluid (especially liquid) remaining in the second pipeline 20 and the third pipeline 21 can be discharged to the liquid storage box 3 through the second interface 212 of the third pipeline 21. During the pressure relief process after the pressure calibration is completed, a pressure detector connected to the pressure return device can be used to perform real-time detection of the fluid pressure in the first pipeline 11. When the pressure in the pipeline reaches the preset pressure value, the electromagnet 221 in the pressure relief device 2 is energized to connect the second pipeline 20 and the third pipeline 21, thereby achieving precise control of the electric control valve of the pressure relief device 2.

[0060] Embodiment 5:

[0061] like Figure 3 and Figure 4As shown, a schematic diagram of the structure of the pressure connection device provided by this embodiment is also shown, including the pressure return to zero device of the above embodiment 3 (it can also be the pressure return to zero device of the above embodiment 4), a pressure connector 4 and a pressure detection module 5 connected thereto, wherein the pressure connector 4 is arranged on the connection seat 1 of the pressure return to zero device and is connected to the first pipeline 11 arranged in the connection seat 1, and the pressure detection module 5 can detect the fluid pressure in the first pipeline 11 in real time. An electrical connection socket is arranged on the pressure detection module 5, and the pressure detection data of the fluid in the first pipeline 11 can be obtained in real time by powering the pressure detection module 5 through the electrical connection socket. The pressure detection data is fed back to the pressure calibration system (or pressure controller) to realize real-time detection and precise pressure regulation of the pressure condition in the pressure calibration pipeline, and can guide the action of the electric control valve in the pressure relief device to realize precise control of the discharge pressure relief in the pressure calibration pipeline. When the pressure detection module 5 is not connected to the pressure connector 4, the pressure connection device provided by this embodiment can also include a plugging member for plugging and sealing the pressure connector 4 to prevent dust or other impurities from entering the pressure connector 4.

[0062] Embodiment 6:

[0063] This embodiment provides a pressure calibration system, which includes the pressure return zero device provided in embodiment 3 or embodiment 4 or the pressure connection device provided in embodiment 5, and a pressure connection platform 6 (see Figure 5 ) and a pressure generating device (such as a manual pressure source or an automatic intelligent pressure source), wherein a first pipeline 11 is provided in the connection seat 1 of the pressure return zero device, and the first pipeline 11 has an input port 111 and an output port 112 (combined Figure 3 In the pressure calibration system, the input port 111 is connected to a pressure generating device (not shown in the figure, it can be any device that generates pressure), and the output port 112 is connected to a pressure connection platform 6 (used to connect the device to be tested). In the pressure calibration system, an electric control valve 22 (combined with a pressure return device) is used in the pressure return device to automatically control the opening and closing of the second pipeline 20 and the third pipeline 21 of the pressure relief device according to preset instructions. Figure 4 As shown in the figure, the precise on-off control of the second pipeline 20 and the third pipeline 21 in the pressure relief device can be realized, so that the fluid in the first pipeline 11 for pressure verification can automatically flow back to the pressure generating device without human intervention, thereby realizing automatic control of the pressure relief back to zero, which can improve the automation control capability of the pressure verification system and improve the pressure verification efficiency.

[0064] Each embodiment of the present invention has its own emphasis. For implementation methods that are not fully described in one embodiment, reference may be made to implementation methods in other embodiments.

[0065] In the above embodiments, the pressure return to zero device is provided with a connecting seat for a first pipeline connected to a pressure source, and a pressure relief device arranged on the connecting seat for automatically and quickly releasing pressure in the first pipeline. The pressure relief device includes a second pipeline and a third pipeline connected to the first pipeline and an electric control valve for controlling the on-off of the second pipeline and the third pipeline. The on-off state of the electric control valve is controlled by a control instruction to automatically control the on-off of the second pipeline and the third pipeline, and then the first pipeline is connected to the atmosphere through the third pipeline and the second pipeline when necessary, so as to realize automatic and rapid pressure relief and return to zero in the first pipeline, and reduce the time consumption of the pressure return to zero process. Therefore, the pressure return to zero device provided by the present invention has a high degree of automation and can avoid the inconvenience caused by manual control of pressure relief.

[0066] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pressure return to zero device, characterized in that: The pressure return to zero device is applied to a pressure detection / calibration system, and the pressure return to zero device comprises: A connecting seat (1) provided with a first pipeline (11) for connecting to a pressure source; A pressure relief device (2), which is arranged on the connection seat (1), and comprises a second pipeline (20) and a third pipeline (21) which are connected to each other, and an electric control valve (22) for controlling the opening and closing of the second pipeline (20) and the third pipeline (21); wherein the second pipeline (20) and the third pipeline (21) are connected via a cavity (213), the second pipeline (20) is connected to the first pipeline (11), and the third pipeline (21) is connected to the atmosphere; The electric control valve (22) comprises a ball (223), the ball (223) being movably disposed in the cavity (213), and the electric control valve (22) controls the ball (223) to move in the cavity (213) in response to a control instruction, so that the second pipeline (20) is connected to or disconnected from the third pipeline (21); The control instruction is used to control the on / off state of the electric control valve (22), wherein the control instruction includes, during the pressure relief process of the pressure detection / calibration system, using a pressure detector connected to the electric control valve (22) to monitor the fluid pressure in the first pipeline (11) in real time, and when the pressure in the first pipeline (11) reaches a preset pressure value, sending a power-on instruction to the electric control valve (22) so that the second pipeline (20) is connected to the third pipeline (21), and the first pipeline (11) is depressurized until the pressure returns to zero.

2. The pressure return to zero device according to claim 1, characterized in that: The electric control valve (22) further comprises an electromagnet (221) and a push pin (222), wherein the push pin (222) is connected to the electromagnet (221), the electromagnet (221) moves in response to a power-on state, and the push pin (222) moves synchronously with the electromagnet (221) to push the ball (223) to move in the cavity (213), thereby connecting or disconnecting the second pipeline (20) and the third pipeline (21).

3. The pressure return to zero device according to claim 1, characterized in that: The electric control valve (22) further comprises an electromagnet (221), a push pin (222) and an elastic member (224); the push pin (222) is connected to the electromagnet (221); the elastic member (224) is arranged below the sphere (223) in the cavity (213); the sphere (223) blocks the cavity (213) in response to the action of the elastic member (224); the electromagnet (221) can move in response to a power-on state; the push pin (222) moves synchronously with the electromagnet (221) to push the sphere (223) to move in the cavity (213), so that the second pipeline (20) is connected to or disconnected from the third pipeline (21).

4. The pressure return to zero device according to any one of claims 1 to 3, characterized in that: A concave surface is provided at the connection port between the cavity (213) and the third pipeline (21); the concave surface matches the sphere (223); when the sphere (223) fits the concave surface, the second pipeline (20) is disconnected from the third pipeline (21); when the sphere (223) is separated from the concave surface, the second pipeline (20) is connected to the third pipeline (21).

5. The pressure return to zero device according to any one of claims 1 to 3, characterized in that: The pressure return to zero device also includes a pressure relief device connector (23), which is arranged on the connecting seat (1); the pressure relief device (2) is connected to the pressure relief device connector (23); and one end of the second pipeline (20) is arranged in the pressure relief device connector (23).

6. The pressure return to zero device according to any one of claims 1 to 3, characterized in that: The pressure return to zero device also includes a liquid storage box (3), which is arranged below the connecting seat (1), and the liquid discharged from the third pipeline (21) flows into the liquid storage box (3).

7. The pressure return to zero device according to any one of claims 1 to 3, characterized in that: The first pipeline (11) has an input port (111) and an output port (112), wherein the input port (111) is used to connect to a pressure generating device, and the output port (112) is used to connect to a detected device.

8. A pressure connection device, characterized in that: It comprises a pressure detection module (5), a pressure connector (4) and a pressure return to zero device according to any one of claims 1 to 7, wherein the pressure connector (4) is arranged on a connection seat (1) of the pressure return to zero device and is connected to the first pipeline (11), and the pressure detection module (5) is connected to the pressure connector (4).

9. A pressure calibration system, characterized in that: It comprises a pressure generating device, a pressure connecting platform (6) for connecting a detected device, and the pressure connecting device according to claim 8, wherein a first pipeline (11) arranged on a pressure return device on the pressure connecting device has an input port (111) and an output port (112), wherein the input port (111) is connected to the pressure generating device, and the output port (112) is connected to the pressure connecting platform (6).

10. A method for automatically returning pressure to zero, characterized in that: The method uses the pressure return to zero device described in any one of claims 1 to 7, and the method comprises: When performing the pressure calibration task, the electric control valve (22) is powered off, the ball (223) blocks the top of the cavity (213), and the second pipeline (20) is disconnected from the third pipeline (21); After the pressure check is completed, after detecting that the pressure value in the first pipeline (11) reaches the set pressure value, the electric control valve (22) is energized to push the ball (223) to move in the cavity (213) so that the second pipeline (20) is connected to the third pipeline (21), and the first pipeline (11) is connected to the atmosphere through the third pipeline (21) and the second pipeline (20), thereby relieving the pressure of the first pipeline (11).

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