Valve protection mechanism capable of preventing mistaken touch

Abstract

The utility model discloses a mistaken touch prevention valve protection mechanism which comprises a first reversing valve, an input port of the first reversing valve is communicated with an air source, an output port of the first reversing valve is connected with an air inlet of a pneumatic valve, an exhaust port of the first reversing valve is connected with a first connector of a protection assembly, and a second connector of the protection assembly is communicated with the air source. A third interface of the protection assembly is communicated with the exhaust space; the first reversing valve and the protection assembly are controlled by different controllers, and the protection assembly is used for controlling on-off of airflow between the exhaust port of the first reversing valve and the exhaust space. When the control mechanism of the first reversing valve is touched by mistake or loses power, the protection assembly can respond quickly, and sudden change of air pressure in the pneumatic valve is prevented by controlling on-off of airflow between the exhaust port of the first reversing valve and the exhaust space.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a valve protection mechanism to prevent accidental activation. Background Technology

[0002] Pneumatic valves use compressed air as a power source and a cylinder as an actuator to control the opening and closing of the valve. A typical pneumatic valve consists of a valve body, valve cover, valve stem, valve core, seals, and cylinder. Control of the valve is achieved by converting the thrust of the cylinder into the movement of the valve stem. If the control mechanism at the air inlet of the pneumatic valve is accidentally activated or closed due to power failure, a sudden change in air pressure within the valve can easily occur, causing shock to the valve or the system it is part of. Utility Model Content

[0003] The main purpose of this utility model is to provide a valve connection structure and valve that can prevent sudden changes in air pressure inside the pneumatic valve, thereby avoiding impact on the pneumatic valve or the system in which it is located.

[0004] To address the aforementioned issues, this application provides a valve protection mechanism to prevent accidental activation, comprising: a first reversing valve; the input port of the first reversing valve is connected to an air source; the output port of the first reversing valve is connected to the air inlet of a pneumatic valve; the exhaust port of the first reversing valve is connected to a first interface of the protection component; a second interface of the protection component is connected to an air source of the protection component; and a third interface of the protection component is connected to an exhaust space. The first reversing valve and the protection component are controlled by different controllers, wherein the protection component is used to control the flow of air between the exhaust port of the first reversing valve and the exhaust space of the protection component.

[0005] Preferably, the protective component includes a second reversing valve, the inlet of which is connected to the outlet of the first reversing valve, the pilot port of which is connected to the outlet of the preliminary air source treatment mechanism, and the outlet of which is in communication with the exhaust space; or, the protective component includes a first safety valve, the inlet of which is connected to the outlet of the first reversing valve, and the outlet of which is in communication with the exhaust space.

[0006] Preferably, the inlet of the second directional valve and the outlet of the first directional valve are connected by a first pipeline. A first check valve is provided on the first pipeline near the first directional valve. The inlet of the first check valve is connected to the outlet of the first directional valve, and the outlet of the first check valve is connected to the inlet of the second directional valve.

[0007] Preferably, the inlet of the first reversing valve is connected to the air source through a preliminary air source treatment mechanism. The preliminary air source treatment mechanism includes a first air filter pressure reducer and a pneumatic amplifier. The inlet of the first air filter pressure reducer is connected to the air source, the outlet of the first air filter pressure reducer is connected to the inlet of the pneumatic amplifier, and the outlet of the pneumatic amplifier is connected to the inlet of the first reversing valve.

[0008] Preferably, the valve stem of the pneumatic valve is provided with a positioning component, and a limiting component is provided on one side of the valve stem; the protective mechanism further includes: a digital valve positioner; at least one of the positioning component or the limiting component is communicatively connected to the digital valve positioner for transmitting valve stem position information to the digital valve positioner.

[0009] Preferably, the valve protection mechanism for preventing accidental activation further includes a second air filter regulator. The inlet of the second air filter regulator is connected to an air source, the outlet of the second air filter regulator is connected to the first interface of the digital valve positioner, and the second interface of the digital valve positioner is connected to the pressure signal input port of the pneumatic amplifier.

[0010] Preferably, a first pressure measuring component is also provided on the first pipeline between the output port of the first one-way valve and the input port of the second reversing valve.

[0011] Preferably, a second pressure measuring component and a second one-way valve are provided between the output end of the preliminary gas source treatment mechanism and the first reversing valve. The second pressure measuring component is located between the output end of the preliminary gas source treatment mechanism and the input port of the second one-way valve. The output port of the second one-way valve is connected to the input port of the first reversing valve and the air inlet of the protection component, respectively.

[0012] Preferably, the inlet of the second check valve is also connected to the outlet of the third check valve, and the inlet of the third check valve is connected to the outlet of the first directional valve.

[0013] Preferably, a third pressure measuring component is provided on the connecting pipe between the output port of the first air filter pressure reducer and the input port of the pneumatic amplifier.

[0014] The beneficial effects of this invention are as follows: Unlike existing technologies, this invention directs the air source to the inlet of the pneumatic valve via a first reversing valve to drive the pneumatic valve. The exhaust port of the first reversing valve is connected to the first interface of the protective component. When the first reversing valve is in normal operation, compressed air is allowed to enter the first reversing valve from the air source after passing through the preliminary air source processing mechanism, and then flow to the inlet of the pneumatic valve, thereby driving the pneumatic valve. When the control mechanism of the first reversing valve malfunctions or loses power, the protective component can respond quickly by controlling the airflow between the exhaust port of the first reversing valve and the exhaust space to prevent sudden changes in the internal air pressure of the pneumatic valve. Furthermore, since the first reversing valve and the protective component are controlled by different controllers, even if the controller of the first reversing valve malfunctions or loses power, causing gas to be discharged from the exhaust port, the controller of the protective component can still normally control the protective component to select whether to release the air pressure, improving the stability of the pneumatic valve control system. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0016] Figure 1 This is a first-state circuit diagram of an embodiment of the valve protection mechanism of this application;

[0017] Figure 2 yes Figure 1 The circuit diagram shown is for the second state of the valve protection mechanism.

[0018] Figure 3 This is a circuit diagram of yet another embodiment of the valve protection mechanism of this application.

[0019] Explanation of reference numerals in the attached figures:

[0020] 10-First air filter pressure regulator; 11-Third pressure measuring component; 12-Pneumatic amplifier; 13-Fourth pressure measuring component; 14-Second pressure measuring component; 15-Second check valve; 16-Third check valve; 17-Second directional valve; 18-First directional valve; 19-Fifth pressure measuring component; 20-Pneumatic valve; 21-Limit component; 22-Positioning component; 23-Digital valve positioner; 24-Second air filter pressure regulator; 30-First check valve; 31-First pressure measuring component. Detailed Implementation

[0021] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0022] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "setting," "connection," and "linking" should be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or a connection through an intermediate medium. Those skilled in the art will understand the specific meanings of the above within the scope of this application based on the specific circumstances.

[0023] Please see Figure 1 and Figure 2 , Figure 1 This is a first-state circuit diagram of an embodiment of the valve protection mechanism of this application. Figure 2 yes Figure 1 The circuit diagram shown is for the second state of the valve protection mechanism.

[0024] A valve protection mechanism to prevent accidental activation includes: a first directional valve 18, the inlet of which is connected to an air source via a preliminary air source processing mechanism; the outlet of which is connected to the inlet of a pneumatic valve 20; the outlet of which is connected to a first interface of a protective component; the second interface of the protective component is connected to the air source; and the third interface of the protective component is connected to a preset exhaust space. The first directional valve 18 and the protective component are controlled by different controllers, wherein the protective component is used to control the airflow between the outlet of the first directional valve and the exhaust space.

[0025] Specifically, the air inlet of the pneumatic valve 20 is connected to the air chamber of the pneumatic valve 20. The pneumatic valve 20 is driven by compressed air entering the air chamber, which moves the valve stem to control the opening and closing of the valve. In the above scheme, the air source is directed to the air inlet of the pneumatic valve 20 through the first directional valve to drive the pneumatic valve 20 to operate. The exhaust port of the first directional valve 18 is connected to the first interface of the protective assembly. When the first directional valve 18 is in normal operating condition, such as... Figure 1As shown, compressed air enters the first reversing valve 18 after passing through the preliminary air source treatment mechanism from the air source, and then flows to the air inlet of the pneumatic valve 20, thereby driving the pneumatic valve 20 to work. When the control mechanism of the first reversing valve 18 is accidentally activated or loses power, as... Figure 2 As shown, this causes the first reversing valve 18 to switch states, discharging the compressed air that was originally flowing to the pneumatic valve 20 through the exhaust port and into the protective assembly. The protective assembly provides secondary protection, preventing sudden changes in air pressure. Furthermore, since the first reversing valve 18 and the protective assembly are controlled by different controllers, even if the controller of the first reversing valve 18 malfunctions or loses power, causing gas to be discharged from the exhaust port, the controller of the protective assembly can still normally control the protective assembly to select whether to release the air pressure, improving the stability of the pneumatic valve control system.

[0026] In some specific embodiments, the preset exhaust space can be the inlet of a gas processing device or a gas storage space, etc., which is not limited herein. The controller of the protective component is used to control the working state of the protective component. The first working state of the protective component is that the first interface and the third interface of the protective component are not internally connected. When the controller of the first reversing valve is triggered to switch the working state or the first reversing valve is de-energized, the compressed gas of the pneumatic valve will be output through the exhaust port of the first reversing valve. The gas discharged from the exhaust port of the first reversing valve will be blocked by the protective component, thereby preventing the gas pressure of the pneumatic valve from changing suddenly when the controller of the first reversing valve is accidentally triggered or de-energized. The second working state of the protective component is that when the pneumatic valve needs to release gas, the controller of the protective component controls the protective component to switch the first interface and the third interface to be internally connected. The exhaust of the first reversing valve will be controlled by the protective component for a second time to avoid sudden gas pressure changes.

[0027] In some embodiments, the protective component may include a first safety valve, the air inlet of which is connected to the exhaust port of the first reversing valve 18, and the exhaust port of the first safety valve is in communication with the exhaust space. The first safety valve is used to automatically open and release air pressure when the air pressure exceeds a preset threshold, so as to protect the system from damage caused by excessive air pressure.

[0028] In other embodiments, the protective component may be a second reversing valve 17, the air inlet of which is connected to the exhaust port of the first reversing valve 18, the pilot port of which is connected to the output port of the preliminary air source treatment mechanism, and the exhaust port of which is connected to the exhaust space.

[0029] Specifically, the second directional valve 17 can be an externally piloted solenoid valve. This externally piloted solenoid valve receives a pilot gas supply through its pilot port to actuate the valve core. The inlet of the second directional valve 17 receives the gas discharged from the first directional valve 18. When the first directional valve 18 closes due to accidental contact or power failure, the gas discharged from the first directional valve 18 can enter through the inlet of the second directional valve 17 and be shut off by the second directional valve 17, stabilizing the pneumatic valve pressure while preventing accidental gas leakage. When the second directional valve 17 receives a control signal from the controller to switch its operating state, the pilot gas received at the pilot port pushes the second directional valve 17 to switch, opening the passage between the first and third interfaces of the second directional valve 17, thereby achieving on / off control of the gas path of the second directional valve 17.

[0030] In other embodiments, there are situations where the exhaust rate needs to be adjusted. This can be achieved by expanding or adjusting the components in the protective assembly. For example, a pressure regulating component can be added to the protective assembly to allow for pressure adjustment as needed by the system. Alternatively, components can be added or the second directional valve 17 can be replaced according to system requirements, making the system easier to maintain and expand. In some specific applications, the first directional valve 18 can be a solenoid valve of model NTMH8316G034, and the second directional valve 17 can be a solenoid valve of model NU8316G034.

[0031] In some embodiments, in order to ensure unidirectional airflow in a specific direction and avoid backflow causing system turbulence or energy loss, the inlet of the second reversing valve 17 and the outlet of the first reversing valve 18 are connected by a first pipeline. A first check valve 30 is provided on the first pipeline near the first reversing valve 18. The inlet of the first check valve 30 is connected to the outlet of the first reversing valve 18, and the outlet of the first check valve 30 is connected to the inlet of the second reversing valve 17.

[0032] Specifically, the inlet of the first one-way valve 30 is tightly connected to the outlet of the first directional valve 18. The first one-way valve 30 is normally closed. It can be understood that the first one-way valve 30 has a starting pressure characteristic; it can only open when the pressure reaches or exceeds the starting pressure value of the first one-way valve, allowing airflow. If the first directional valve 18 accidentally discharges air due to misoperation, and the resulting air pressure is lower than the starting pressure of the first one-way valve 30, then the first one-way valve 30 will remain closed, effectively blocking the flow of air from the first directional valve 18 to the second directional valve 17. When the air pressure is high enough, reaching or exceeding the starting pressure, the first one-way valve 30 will open quickly and reliably, allowing the airflow to continue along the predetermined path. This ensures that the system can respond quickly and effectively under normal or emergency conditions.

[0033] In some embodiments, the preliminary air source treatment mechanism includes a first air filter pressure reducer 10 and a pneumatic amplifier 12. The input port of the first air filter pressure reducer 10 is connected to the air source, the output port of the first air filter pressure reducer 10 is connected to the input port of the pneumatic amplifier 12, and the output port of the pneumatic amplifier 12 is connected to the input port of the first reversing valve 18.

[0034] Specifically, in order to process and regulate the air pressure and airflow quality from the external air source, the first air filter pressure reducer 10 filters out impurities and particles from the air source, reducing and stabilizing the air pressure to the range required by the system. The pneumatic amplifier 12 amplifies the air pressure signal from the first air filter pressure reducer 10, providing stable air pressure power to the subsequent first reversing valve 18 and protection components.

[0035] In some embodiments, the valve stem of the pneumatic valve 20 is provided with a positioning component 22, and a limiting component 21 is provided on one side of the valve stem. The protective mechanism further includes a digital valve positioner 23. At least one of the positioning component 22 or the limiting component 21 is communicatively connected to the digital valve positioner 23 for transmitting valve stem position information to the digital valve positioner 23.

[0036] Specifically, the limit component 21 can be a limit switch. When the positioning component 22 on the valve stem reaches the preset position, the limit switch will be triggered, and a signal will be sent from the positioning component 22 or the limit component 21 to the digital valve positioner 23, indicating that the valve stem has reached the preset position, thereby achieving precise control of the pneumatic valve 20.

[0037] In some embodiments, a second air filter pressure regulator 24 is also included. The input port of the second air filter pressure regulator 24 is connected to an air source, and the output port of the second air filter pressure regulator 24 is connected to a first interface of a digital valve positioner 23. The second interface of the digital valve positioner 23 is connected to a pressure signal input port of a pneumatic amplifier 12.

[0038] The second air filter pressure reducer 24 provides stable and filtered air pressure to the digital valve positioner 23. The second interface of the digital valve positioner 23 is connected to the pressure signal input port of the pneumatic amplifier 12 to transmit the air pressure signal to the pneumatic amplifier 12. In some applications, the digital valve positioner 23 not only receives valve stem position information from the positioning component 22 or the limit component 21, but also precisely controls the valve stem position of the pneumatic valve 20 based on this information and control signals from the control system. Through its connection with the pneumatic amplifier 12, it achieves remote and precise control of the pneumatic valve 20.

[0039] In some application scenarios, a fourth pressure measuring component 13 is provided between the second interface of the digital valve positioner 23 and the pressure signal input port of the pneumatic amplifier 12, and the power supply terminal of the digital valve positioner 23 is connected to an input current of 4~20mA.

[0040] In some embodiments, a first pressure measuring component 31 is further provided on the first pipeline between the output port of the first one-way valve 30 and the input port of the second reversing valve 17.

[0041] The first pressure sensing component 31 is used to monitor and display the air pressure value in the pipeline in real time, ensuring that the air pressure value is within a safe range. When the air pressure at the exhaust port of the first reversing valve 18 is abnormal, the first pressure sensing component 31 can issue an alarm or trigger a safety mechanism to give the staff time to take action. For example, if the controller of the first reversing valve 18 is accidentally activated or loses power, the first pressure sensing component 31 will detect an increase in air pressure in the pipeline and issue an alarm to remind the staff to take appropriate action.

[0042] In some embodiments, a second pressure measuring component 14 and a second one-way valve 15 are provided between the output end of the preliminary gas source processing mechanism and the first reversing valve 18. The second pressure measuring component 14 is disposed between the output end of the preliminary gas source processing mechanism and the input port of the second one-way valve 15. The output port of the second one-way valve 15 is connected to the input port of the first reversing valve 18 and the air inlet of the protection component, respectively.

[0043] Specifically, the second pressure measuring component 14 is used to monitor and display the air pressure value at the output end of the preliminary air source treatment mechanism in real time, ensuring that the air pressure is within the preset safe range. The second one-way valve 15 ensures that the airflow flows unidirectionally from the preliminary air source treatment mechanism to the first reversing valve 18 and the protection component, preventing system chaos or damage caused by backflow of airflow.

[0044] In some embodiments, the input port of the second check valve 15 is also connected to the output port of the third check valve 16, and the input port of the third check valve 16 is connected to the output port of the first directional valve 18.

[0045] Specifically, when the first directional valve 18 exhausts gas, the third check valve 16 allows airflow to flow unidirectionally from the first directional valve 18 to the second check valve 15, further ensuring the orderly flow of airflow in the system. This helps prevent backflow of airflow and avoids system chaos or damage.

[0046] In some specific embodiments, a fifth pressure measuring component 19 is also provided between the input end of the third one-way valve 16 and the air inlet of the pneumatic valve 20 for monitoring the air pressure of the pipeline.

[0047] In some embodiments, a third pressure measuring component 11 is provided on the connecting pipe between the output port of the first air filter pressure reducer 10 and the input port of the pneumatic amplifier 12. The third pressure measuring component 11 monitors and displays the air pressure value between the output terminal of the first air filter pressure reducer 10 and the input terminal of the pneumatic amplifier 12 in real time, ensuring that the air pressure is within a preset safe range. When the air pressure is abnormal, the third pressure measuring component 11 can issue an alarm or trigger a safety mechanism to protect subsequent pneumatic components from damage.

[0048] Through the above scheme, the air source provides the original air pressure, which is then processed by the first air filter pressure reducer 10 to output a stable air pressure. The third pressure measuring component 11 monitors the air pressure value in this section of the pipeline in real time to ensure that the air pressure is within a safe range. After being processed by the first air filter pressure reducer 10, the air source enters the pneumatic amplifier 12. The pneumatic amplifier 12 receives the air pressure signal from the digital valve positioner 23, amplifies it, and transmits it to the first reversing valve 18. The first reversing valve 18 controls the airflow direction according to the direction of the air pressure signal. Under normal operating conditions, the first reversing valve 18 allows compressed air to enter from the air source through the preliminary air source processing mechanism and then flow to the air inlet of the pneumatic valve 20, driving the pneumatic valve 20 to work. When the control mechanism of the first reversing valve 18 is accidentally touched or de-energized, the first reversing valve 18 switches states.

[0049] When the control mechanism of the first directional valve malfunctions or loses power, the protective component can respond quickly by controlling the airflow between the exhaust port of the first directional valve 18 and the exhaust space to prevent sudden changes in the internal air pressure of the pneumatic valve 20. Furthermore, since the first directional valve 18 and the protective component are controlled by different controllers, even if the controller of the first directional valve 18 malfunctions or loses power, causing gas to be discharged from the exhaust port, the controller of the protective component can still normally control whether the protective component releases the air pressure, improving the stability of the pneumatic valve 20 control system.

[0050] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A valve protection mechanism to prevent accidental activation, characterized in that, include: The first reversing valve (18) has its input port connected to the air source, its output port connected to the air inlet of the pneumatic valve (20), its exhaust port connected to the first interface of the protective component, its second interface connected to the air source, and its third interface connected to the exhaust space. The first reversing valve (18) and the protective component are controlled by different controllers. The protective component is used to control the flow of air between the exhaust port of the first reversing valve and the exhaust space.

2. The valve protection mechanism against accidental contact according to claim 1, characterized in that, The protective assembly includes a second reversing valve (17), the air inlet of the second reversing valve (17) is connected to the exhaust port of the first reversing valve (18), the pilot port of the second reversing valve (17) is connected to the output port of the preliminary air source treatment mechanism, and the exhaust port of the second reversing valve (17) is connected to the exhaust space. or, The protective component includes a first safety valve, the air inlet of which is connected to the exhaust port of the first reversing valve (18), and the exhaust port of the first safety valve is connected to the exhaust space.

3. The valve protection mechanism against accidental contact according to claim 2, characterized in that, The inlet of the second reversing valve (17) is connected to the outlet of the first reversing valve (18) via a first pipeline. A first check valve (30) is provided on the first pipeline near the first reversing valve (18). The inlet of the first check valve (30) is connected to the outlet of the first reversing valve (18), and the outlet of the first check valve (30) is connected to the inlet of the second reversing valve (17).

4. The valve protection mechanism against accidental contact according to claim 1, characterized in that, The inlet of the first reversing valve (18) is connected to the air source through a preliminary air source treatment mechanism. The preliminary air source treatment mechanism includes a first air filter pressure reducer (10) and a pneumatic amplifier (12). The inlet of the first air filter pressure reducer (10) is connected to the air source, the outlet of the first air filter pressure reducer (10) is connected to the inlet of the pneumatic amplifier (12), and the outlet of the pneumatic amplifier (12) is connected to the inlet of the first reversing valve (18).

5. The valve protection mechanism against accidental contact according to claim 4, characterized in that, The valve stem of the pneumatic valve (20) is provided with a positioning component (22), and a limiting component (21) is provided on one side of the valve stem of the pneumatic valve (20). The protective mechanism further includes: a digital valve positioner (23); at least one of the positioning component (22) or the limiting component (21) is communicatively connected to the digital valve positioner (23) for transmitting the valve stem position information to the digital valve positioner (23).

6. The valve protection mechanism against accidental contact according to claim 4, characterized in that, It also includes a second air filter pressure regulator (24), the input port of which is connected to the air source, the output port of which is connected to the first interface of the digital valve positioner (23), and the second interface of the digital valve positioner (23) is connected to the pressure signal input port of the pneumatic amplifier (12).

7. The valve protection mechanism against accidental contact according to claim 3, characterized in that, A first pressure measuring component (31) is also provided on the first pipeline between the output port of the first one-way valve (30) and the input port of the second reversing valve (17).

8. The valve protection mechanism against accidental contact according to claim 4 or 7, characterized in that, A second pressure measuring component (14) and a second one-way valve (15) are provided between the output end of the preliminary gas source treatment mechanism and the first reversing valve (18). The second pressure measuring component (14) is located between the output end of the preliminary gas source treatment mechanism and the input port of the second one-way valve (15). The output port of the second one-way valve (15) is connected to the input port of the first reversing valve (18) and the air inlet of the protection component, respectively.

9. The valve protection mechanism against accidental contact according to claim 8, characterized in that, The input port of the second check valve (15) is also connected to the output port of the third check valve (16), and the input port of the third check valve (16) is connected to the output port of the first reversing valve (18).

10. The valve protection mechanism against accidental contact according to claim 4, characterized in that, A third pressure measuring component (11) is provided on the connecting pipe between the output port of the first air filter pressure reducer (10) and the input port of the pneumatic amplifier (12).

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