Control system for a dome valve

Abstract

The application discloses a control system of a dome valve, which comprises a main control valve, an auxiliary control valve, a gas container, a one-way valve, a control valve and an actuator, the auxiliary control valve comprises a first gas inlet, a first gas outlet and a second gas outlet, the input end of the one-way valve is connected with a gas source, the output end of the one-way valve is connected with the gas container, the gas container is connected with the first gas inlet, the first gas outlet is connected with the control valve, the second gas outlet is connected with the actuator, the actuator is connected with the dome valve and is used for driving a valve core of the dome valve, and the control valve is connected with a sealing ring of the dome valve; the main control valve is connected with the gas source and the auxiliary control valve, and the main control valve controls the first gas inlet to be communicated with the first gas outlet or the second gas outlet.

Description

Technical Field

[0001] This invention relates to the field of solid material valves, and in particular to a control system for a dome valve. Background Technology

[0002] In existing thermal power plants, steel mills, metallurgical plants, and other facilities that need to transport various loose, dry, non-sticky solid materials, dome valves are typically used as sealing valves for the conveying channels. The valve core of a current dome valve is a spherical dome. During the opening and closing process, a gap of approximately 2mm is maintained between the valve core and the rubber sealing ring, allowing for contactless movement between the valve core and the rubber sealing ring. This aims to prevent friction and reduce wear. The pneumatic actuator of the dome valve is a fully sealed linear or sector cylinder, directly driving the dome valve's rotation, effectively preventing dust from entering and causing wear and leakage. When the dome valve is closed, the rubber sealing ring inflates and expands, pressing tightly against the spherical dome valve core, forming a highly reliable sealing ring that prevents the flow of materials within the pipeline. However, when the air supply malfunctions, preventing the rubber sealing ring from inflating and sealing the dome valve core, leakage can occur. Summary of the Invention

[0003] The purpose of this invention is to solve the problem of the dome valve failing to seal when the gas source malfunctions.

[0004] The present invention provides a control system for a dome valve to address the above-mentioned technical problems.

[0005] The technical solution described in this invention is:

[0006] A control system for a dome valve, supplied by a gas source, includes a main control valve, an auxiliary control valve, a gas container, a check valve, a control valve, and an actuator. The auxiliary control valve includes a first inlet, a first outlet, and a second outlet. The input end of the check valve is connected to the gas source, and its output end is connected to the gas container. The gas container is connected to the first inlet, the first outlet is connected to the control valve, and the second outlet is connected to the actuator. The actuator is connected to the dome valve and is used to drive the valve core of the dome valve. The control valve is connected to the sealing ring of the dome valve. The main control valve connects the gas source and the auxiliary control valve, and controls the connection between the first inlet and the first outlet or between the first inlet and the second outlet.

[0007] Furthermore, the auxiliary control valve also includes exhaust port 1, exhaust port 2, and valve core 1. The main control valve controls the movement of valve core 1, and the movement of valve core 1 enables the connection between exhaust port 1 and exhaust port 1 or between exhaust port 2 and exhaust port 2.

[0008] Furthermore, the main control valve includes a second valve core, a second air inlet, a third air outlet, and a third exhaust port. The auxiliary control valve also includes a pneumatic control port. The second air inlet is connected to an air source, and the third air outlet is connected to the pneumatic control port. By sending air to the pneumatic control port, the first valve core moves. The second valve core moves to connect the third air outlet with the second air inlet or the third exhaust port.

[0009] Furthermore, the actuator includes a drive mechanism and a control element. The drive mechanism is connected to the dome valve, and the control element cooperates with the control valve to open or close the control valve.

[0010] Furthermore, it also includes a pressure reducing valve and an exhaust valve. The pressure reducing valve is located between the check valve and the air source, and between the main control valve and the air source. The exhaust valve is located between the control valve and the dome valve sealing ring.

[0011] Furthermore, the drive mechanism includes an elastic element, a piston, and a drive shaft. The piston divides the actuator interior into a first chamber and a second chamber. The first chamber is connected to the second air outlet. The drive shaft is located in the first chamber, the elastic element is located in the second chamber, and the piston is connected to the drive shaft and is used to drive the drive shaft to rotate.

[0012] Furthermore, the actuator also includes a coupling, which is disposed between the drive mechanism and the dome valve, and the control component is fixedly connected to the coupling.

[0013] Furthermore, the elastic element is a spring, the drive shaft is equipped with a gear, and the piston is equipped with a rack, which meshes with the gear.

[0014] Furthermore, the control valve is equipped with a button, and the control component works in conjunction with the button.

[0015] Furthermore, the main control valve is connected to the gas container via an electrical circuit, and the main control valve controls whether the gas container is working or not.

[0016] Compared with the prior art, the present invention has the following advantages and effects:

[0017] When the gas source fails and cannot supply gas, this invention uses a gas container to supply gas to the dome valve, thereby preventing gas loss. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the gas path system in Example 1;

[0020] Figure 2 This is a schematic diagram of the dome valve in Example 1;

[0021] Figure 3 This is a structural diagram of the drive mechanism in Example 1;

[0022] Figure 4 for Figure 2 Schematic diagram of section AA;

[0023] Figure 5 This is a diagram of another embodiment of Example 1.

[0024] Label Explanation:

[0025] 1-Main control valve; 2-Actuator; 3-Auxiliary control valve; 4-Gas container; 5-Check valve;

[0026] 6 - No. 1 air inlet; 7 - No. 1 air outlet; 8 - No. 2 air outlet; 9 - Control valve;

[0027] 10 - Air source; 11 - Exhaust port 1; 12 - Exhaust port 2; 13 - Dome valve;

[0028] 14 - Air control port; 15 - No. 2 air inlet; 16 - No. 3 air outlet; 17 - No. 3 exhaust port;

[0029] 18-Tee fitting; 19-Pressure reducing valve; 20-Exhaust valve; 21-Dome valve sealing ring;

[0030] 22-Dome valve core; 23-Control component; 24-Coupling; 25-Button; 26-Elastic component;

[0031] 27-Piston; 28-Cavity 1; 29-Cavity 2; 30-Gear; 31-Rack; 32-Support;

[0032] 33 - Drive shaft. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0034] In the following description, any component described with respect to one figure in various embodiments of the invention is equivalent to a component with the same name described with respect to any other figure. Throughout the specification, ordinal numbers (e.g., number one, number two, number three, etc.) are used as adjectives for elements (i.e., any nouns in this application). The use of these ordinal numbers is not intended to imply or constitute a particular order of the elements, nor to limit any element to having only one; the use of these ordinal numbers is to distinguish different elements.

[0035] Example 1: A control system for a dome valve, supplied by a gas source, which is an existing gas supply system. The dome valve can adopt the structure of an existing pneumatic dome valve. The control system includes a main control valve, an auxiliary control valve, a gas container, a check valve, a control valve, and an actuator. Both the main control valve and the auxiliary control valve have multiple ports, and their valve cores have at least two working positions. Both valve cores can be switched between working positions manually, pneumatically, or electrically, for example, a two-position three-way solenoid valve, a two-position five-way pneumatic valve, a two-position five-way solenoid valve, or a manual mechanical valve. The gas container can be any structure for storing gas and can deliver gas, such as a gas tank, a pressure vessel with a gas pump, or an air compressor buffer storage tank. The control valve can be opened or closed manually, pneumatically, or electrically. The actuator can be an existing pneumatic actuator, such as a single-acting cylinder or a double-acting cylinder.

[0036] In one implementation, such as Figure 1 As shown, the auxiliary control valve 3 is a two-position five-way pneumatic control valve, including an inlet 6, an outlet 7, an outlet 8, an exhaust 11, an exhaust 12, and a control port 14. The auxiliary control valve 3 contains a valve core. The main control valve 1 is a two-position three-way solenoid valve, including an inlet 15, an outlet 16, and an exhaust 17. The main control valve 1 contains a valve core. The air source 10 is connected to a three-way connector 18, which is also connected to a check valve 5 and an inlet 15. Preferably, a pressure reducing valve 19 can be installed between the air source 10 and the three-way connector 18. The pressure reducing valve 19 can reduce the high-pressure gas to the required medium or low pressure. The input end of the one-way valve 5 is connected to a three-way connector 18, and its output end is connected to a gas container 4. The gas container 4 is a pressure vessel with an air pump. The gas container 4 is connected to the first air inlet 6, the first air outlet 7 is connected to the control valve 9, the second air outlet 8 is connected to the actuator 2, the third air outlet 16 is connected to the pneumatic control port 14, and the third exhaust port 17 can be connected to an external exhaust device or directly connected to the atmosphere. Similarly, the first exhaust port 11 and the second exhaust port 12 can be connected to an external exhaust device or directly connected to the atmosphere. Figure 2 As shown, actuator 2 is connected to the dome valve. Preferably, a coupling 24 can be provided between actuator 2 and dome valve 13. The actuator includes a drive mechanism and a control component. The drive mechanism drives the control component to move, such as... Figure 3As shown, the actuator is a single-acting cylinder. The drive mechanism includes an elastic element 26, a piston 27, and a drive shaft 33. The piston 27 divides the actuator's interior into a first chamber 28 and a second chamber 29. The first chamber 28 is connected to the second air outlet 8. The drive shaft 33 is located in the first chamber 28 and is fixedly connected to the coupling 24. The elastic element 26 is located in the second chamber 29. The piston 27 is connected to the drive shaft 33. The elastic element 26 is a spring. The drive shaft 33 is equipped with a gear 30, and the piston 27 is equipped with a rack 31. The rack 31 meshes with the gear 30. The control valve can be controlled to open or close via a control component, which can be fixed to the drive shaft or the coupling. Figure 4 As shown, the control component 23 is an L-shaped rod, which is fixed to the coupling 24. The control valve 9 is a mechanical valve, and it is equipped with a button 25. Figure 2 and Figure 4 As shown, control valve 9 is connected to dome valve sealing ring 21. Preferably, an exhaust valve 20 can be provided between the two. Preferably, the control circuit of main control valve 1 and gas container 4 are connected by wires. Main control valve 1 sends a signal to the control circuit of gas container 4. The control circuit controls the gas pump of gas container 4 to work or not work according to the received signal. In the working state, the gas pump is turned on, and the gas in gas container 4 is delivered to the outside. In the non-working state, the gas pump is turned off, and gas container 4 is used only as a gas storage tank. When main control valve 1 loses gas, main control valve 1 sends a signal, the gas pump turns on, and gas container 4 delivers gas to the outside. In this embodiment, the connection between components can use any pipe such as PVC pipe or metal pipe; in addition, a bracket 32 ​​can be provided to fix control valve 9, coupling 24 and pipes.

[0037] In one variation, the gas container 4 can also be configured as follows: Figure 5 As shown, the input end of the one-way valve 5 is connected to the three-way connector 18, and its output end is connected to the gas container 4. The gas container 4 is a gas tank, and a gas pump is installed on the gas tank. The gas container 4 is connected to the first air inlet 6.

[0038] The operation of this implementation is as follows: When the gas source is supplying gas normally, the gas container 4 is not working. To close the dome valve, the second valve core in the main control valve 1 connects the third outlet 16 and the third exhaust port 17, while the second inlet 15 and the third outlet 16 are blocked. The gas from the third outlet 16 is discharged from the third exhaust port 17, and the air control port 14 loses air. The first valve core connects the first inlet 6 and the first outlet 7, allowing air to enter the control valve 9. The first inlet 6 and the second outlet 8 are blocked, thus the actuator 2 loses air. The drive shaft 33 rotates under the action of the elastic element 26, and the drive shaft 33 drives the actuator through the coupling 24. The dome valve core 22 rotates until it is completely closed. When it is completely closed, the control element 23 presses the button 25, and the control valve 9 opens the passage inside the valve. At this time, the gas container 4 does not work. The gas from the gas source enters the dome valve sealing ring 21 through the gas container 4 and the control valve 9. The dome valve sealing ring 21 is inflated, forming an annular sealing strip to isolate the material. When the first air inlet 6 and the second air outlet 8 are not connected, the second air outlet 8 is connected to the second exhaust port 12. The gas in the actuator 2 can be discharged through the second exhaust port 12. When the gas supply is normal, to open the dome valve, the second valve core in the main control valve 1 connects the second air inlet 15 and the third air outlet 16, while the third air outlet 16 and the third exhaust port 17 are blocked. Air enters through the air control port 14, and the first valve core connects the first air inlet 6 and the second air outlet 8. Air enters through the actuator 2, and the first air inlet 6 and the first air outlet 7 are blocked, thus the control valve 9 loses air. The drive shaft 33 rotates in the reverse direction under the action of the gas. The drive shaft 33 drives the dome valve core 22 to rotate in the reverse direction through the coupling 24 until it is fully opened. When the first air inlet 6 and the first air outlet 7 are blocked, the first air outlet 7 connects with the first exhaust port 11. The gas in the dome valve sealing ring 21 can be discharged through the second exhaust port 12. When there is an exhaust valve 20, the gas in the dome valve sealing ring 21 can be discharged through the exhaust valve 20. When the gas source fails and cannot supply gas, the main control valve 1 loses gas, and the gas control port 14 loses gas as well. The first valve core connects the first air inlet 6 and the first air outlet 7. At this time, the gas container 4 works and starts supplying gas. The one-way valve 5 prevents the gas in the gas container 4 from passing through the one-way valve 5. The gas in the gas container 4 enters the first air inlet 6 and is inflated by the gas container 4 to fill the dome valve sealing ring 21, preventing the problem of poor sealing and failure to isolate materials due to the loss of gas source.

[0039] Furthermore, for the main control valve and auxiliary control valve in the above embodiments, another structure can be adopted. The auxiliary control valve can be a two-position three-way solenoid valve, a two-position four-way solenoid valve (without a first exhaust port), or a two-position six-way solenoid valve (the other ports are not connected). The main control valve can be a device for detecting the gas supply status. The main control valve can feed back the gas supply status to the auxiliary control valve, thereby controlling the connection between the first air inlet and the first air outlet or between the first and second air outlets. For example, if the main control valve uses an electronically controlled pressure gauge, to close the dome valve, the main control valve will first detect the gas supply status. For example, if the gas pressure is normal, ... If the gas supply is normal, the main control valve will send a signal to the auxiliary control valve and the gas container. The gas container will not intervene, and the first valve core will control the connection between the first inlet and the first outlet. If the gas supply is abnormal, the main control valve will send a signal to the auxiliary control valve and the gas container. The gas container will intervene and start supplying gas, and the first valve core will control the connection between the first inlet and the first outlet. Similarly, when the dome valve is to be opened, the main control valve will first detect the gas supply status. If the gas supply is normal, the main control valve will send a signal to the auxiliary control valve, and the first valve core will control the connection between the first inlet and the second outlet.

[0040] Furthermore, for the control element and control valve in the above embodiments, another structure can be adopted. The control valve can be a solenoid valve, and the control element is a device for detecting the rotation angle of the drive shaft or the piston stroke. The control element and the control valve are in the same circuit, such as a distance sensor installed in the second chamber. When the control element detects that the piston is at its farthest point, the control element sends a signal to the control valve to control the control valve to open the passage inside the valve.

[0041] Furthermore, it should be noted that the shapes and names of the parts and components described in the specific embodiments described in this specification may differ. All equivalent or simple variations made to the structure, features, and principles described in this patent concept are included within the protection scope of this patent. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, as long as they do not depart from the structure of this invention or exceed the scope defined in these claims, all of which should fall within the protection scope of this invention.

Claims

1. A control system for a dome valve, characterized in that, It includes a main control valve, an auxiliary control valve, a gas container, a check valve, a control valve, and an actuator. The auxiliary control valve includes an inlet port, an outlet port, and an outlet port. The inlet of the check valve is connected to the gas source, and its outlet is connected to the gas container. The gas container is connected to the inlet port, the outlet port is connected to the control valve, and the outlet port is connected to the actuator. The actuator is connected to the dome valve and is used to drive the valve core of the dome valve. The control valve is connected to the sealing ring of the dome valve. The main control valve connects the gas source and the auxiliary control valve. The main control valve controls the connection between the inlet port and the outlet port or the outlet port. The auxiliary control valve also includes exhaust port 1, exhaust port 2 and valve core 1. The main control valve controls the movement of valve core 1. By moving valve core 1, exhaust port 1 can be connected to exhaust port 1 or exhaust port 2 can be connected to exhaust port 2. The main control valve includes a second valve core, a second air inlet, a third air outlet, and a third exhaust port. The auxiliary control valve also includes a pneumatic control port. The second air inlet is connected to an air source, and the third air outlet is connected to the pneumatic control port. By sending air to the pneumatic control port, the first valve core moves. The second valve core moves to connect the third air outlet with the second air inlet or the third exhaust port. The actuator includes a drive mechanism and a control element. The drive mechanism is connected to the dome valve, and the control element cooperates with the control valve to open or close the control valve. It also includes a pressure reducing valve and an exhaust valve. The pressure reducing valve is located between the check valve and the air source and between the main control valve and the air source. The exhaust valve is located between the control valve and the dome valve sealing ring. The drive mechanism includes an elastic element, a piston, and a drive shaft. The piston divides the actuator's interior into a first chamber and a second chamber. The first chamber is connected to the second air outlet. The drive shaft is located in the first chamber, the elastic element is located in the second chamber, and the piston is connected to the drive shaft and is used to drive the drive shaft to rotate. The actuator also includes a coupling, which is located between the drive mechanism and the dome valve, and the control component is fixedly connected to the coupling; The elastic element is a spring, the drive shaft is equipped with a gear, and the piston is equipped with a rack, which meshes with the gear; The control valve is equipped with a button, and the control component works in conjunction with the button; The main control valve is connected to the gas container via an electrical circuit, and the main control valve controls whether the gas container is working or not.

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