Pressure relief control device

Abstract

The utility model provides a pressure relief control device. The pressure relief control device comprises a pressure relief valve, a pneumatic actuator, a first pneumatic control valve, a second pneumatic control valve, an electromagnetic valve, an air source and a controller. A first cavity and a second cavity are arranged in the pneumatic actuator, the first cavity is provided with a first air port, the second cavity is provided with a second air port, and the pneumatic actuator is connected with the pressure release valve; the air source is respectively connected with an air inlet of the electromagnetic valve, an air inlet of the first pneumatic control valve and an air inlet of the second pneumatic control valve; a normally closed air outlet of the electromagnetic valve is connected with an air control port of the first air control valve, and a normally open air outlet of the electromagnetic valve is connected with an air control port of the second air control valve; a normally-closed air outlet of the first pneumatic control valve is connected with the first air port, and a normally-closed air outlet of the second pneumatic control valve is connected with the second air port. The purpose that enough gas is provided for the pneumatic actuator in a short time, it is guaranteed that the pneumatic actuator can rapidly open and close the pressure release valve is achieved, and safe and stable operation of the steam boiler is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of pneumatic control technology, and in particular to a pressure relief control device. Background Art

[0002] During the use of steam boilers, the boiler pressure may be too high, which poses a great safety hazard, so pressure relief is required. At present, steam boilers are relieved by installing pressure relief valves, and when the pressure relief valve is opened, the steam boiler must open quickly, otherwise it will cause the boiler pressure to be too high, thus posing a safety hazard.

[0003] In the prior art, a pneumatic actuator is used to control the opening and closing of a pressure relief valve. Specifically, the opening and closing of the pressure relief valve is achieved by controlling the pressure of the gas inside the pneumatic actuator, wherein a solenoid valve controls the air intake of the pneumatic actuator to change the pressure of the gas inside the pneumatic actuator.

[0004] However, the opening and closing of the pressure relief valve, especially the opening, needs to be completed quickly. At present, due to the limitation of the solenoid valve's own valve core diameter being too thin, it is difficult for the solenoid valve to provide sufficient gas to the pneumatic actuator in a short time, resulting in insufficient gas pressure of the gas in the pneumatic actuator, which in turn leads to insufficient torque of the pneumatic actuator, making it difficult to open and close the pressure relief valve, resulting in the pressure relief valve being stuck and refusing to move. That is, the gas output by the solenoid valve is difficult to meet the requirement of quickly opening or closing the pressure relief valve, which is not conducive to the pressure control of the steam boiler and affects the safe and stable operation of the steam boiler. Utility Model Content

[0005] The present application provides a pressure relief control device, which realizes the function of the air control valve providing sufficient gas to the pneumatic actuator in a short time, thereby ensuring sufficient gas pressure to push the pneumatic actuator piston, and the piston drives the push rod to move. The push rod of the pneumatic actuator is connected to the pressure relief valve, so that the pneumatic actuator generates a sufficiently large torque, opens and closes the pressure relief valve in a short time, and ensures the safe and stable operation of the steam boiler.

[0006] The present application provides a pressure relief control device, comprising: a pressure relief valve, a pneumatic actuator, a first air control valve, a second air control valve, a solenoid valve, an air source and a controller;

[0007] The pneumatic actuator comprises: a cylinder, a piston and a push rod, wherein the piston divides the cylinder into a first cavity and a second cavity, the first cavity is provided with a first air port, the second cavity is provided with a second air port, one end of the push rod is connected to the piston, and the other end of the push rod extends out of the second cavity and is connected to the pressure relief valve;

[0008] The air source is connected to the air inlet of the first air-controlled valve and the air inlet of the second air-controlled valve respectively through the first pipeline, the air source is connected to the air inlet of the solenoid valve through the second pipeline, the normally closed air outlet of the solenoid valve is connected to the air control port of the first air-controlled valve through the second pipeline, the normally open air outlet of the solenoid valve is connected to the air control port of the second air-controlled valve through the second pipeline, the control end of the solenoid valve is connected to the controller, the normally closed air outlet of the first air-controlled valve is connected to the first air port through the first pipeline, and the normally closed air outlet of the second air-controlled valve is connected to the second air port through the first pipeline.

[0009] Optionally, the diameter of the first pipe is greater than the diameter of the second pipe;

[0010] Optionally, the gas source is connected to the first pipeline and the second pipeline through a third pipeline, the diameter of the third pipeline is larger than the diameter of the first pipeline, and the third pipeline is provided with a first through hole and a second through hole;

[0011] The first pipe is connected to the first through hole, the second pipe is connected to the second through hole, and the diameter of the first through hole is greater than the diameter of the second through hole.

[0012] Optionally, the pressure relief control device further includes: a three-way valve;

[0013] The air source is connected to the air inlet of the three-way valve through the first pipeline, the first air outlet of the three-way valve is connected to the air inlet of the first air-controlled valve through the first pipeline, and the second air outlet of the three-way valve is connected to the air inlet of the second air-controlled valve through the first pipeline.

[0014] Optionally, the pressure relief control device also includes: a gas regulating component, the air inlet of the gas regulating component is connected to the gas source, and the air outlet of the gas regulating component is connected to the air inlet of the solenoid valve, the air inlet of the first air-controlled valve, and the air inlet of the second air-controlled valve.

[0015] Optionally, the gas regulating assembly includes: a filter valve;

[0016] The air inlet of the filter valve is connected to the air source, and the air outlet of the filter valve is connected to the air inlet of the solenoid valve, the air inlet of the first air-controlled valve, and the air inlet of the second air-controlled valve.

[0017] Optionally, the gas regulating assembly also includes: a pressure reducing valve, wherein the air inlet of the pressure reducing valve is connected to the air outlet of the filter valve, and the air outlet of the pressure reducing valve is connected to the air inlet of the solenoid valve, the air inlet of the first air-controlled valve, and the air inlet of the second air-controlled valve.

[0018] Optionally, it also includes: a pressure detection component, which is connected to the controller.

[0019] Optionally, the pressure detection component includes: a pressure transmitter;

[0020] The pressure transmitter is connected to the controller.

[0021] The pressure relief control device provided by the present application is connected with the gas source and the third pipeline, and the first pipeline and the second pipeline are connected to the third pipeline respectively, the first pipeline is connected with the first gas-controlled valve and the second gas-controlled valve respectively, the second pipeline is connected with the solenoid valve, the solenoid valve is connected with the first gas-controlled valve and the second gas-controlled valve respectively through the second pipeline, and the first gas-controlled valve and the second gas-controlled valve are connected with the pneumatic actuator respectively through the first pipeline. The solenoid valve coil is controlled by the controller to be energized or de-energized, so that the gas output by the solenoid valve controls the first gas-controlled valve and the second gas-controlled valve, so that the first gas-controlled valve delivers gas to the pneumatic actuator, and the second gas-controlled valve delivers gas to the pneumatic actuator. Since the valve core diameter specifications of the first gas-controlled valve and the second gas-controlled valve are many and the selection range is large, it can ensure that a sufficiently large valve core diameter is provided to achieve the purpose of quickly providing gas to the pneumatic actuator, so that when the pressure relief valve needs to be opened or closed, sufficient gas pressure can be instantly provided to generate a sufficiently large torque to quickly complete the opening or closing of the pressure relief valve, which is beneficial to the normal operation of the pressure relief valve, the pressure control of the steam boiler, and the safe and stable operation of the steam boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 An internal schematic diagram of a pneumatic actuator provided in one embodiment of the present application;

[0024] Figure 2 An internal schematic diagram of a solenoid valve coil provided in an embodiment of the present application with a normally closed air outlet opened when energized;

[0025] Figure 3 An internal schematic diagram of the electromagnetic valve coil provided in an embodiment of the present application with the air outlet opened when power is lost;

[0026] Figure 4 An internal schematic diagram of an air-controlled valve opening a normally closed air outlet provided in an embodiment of the present application;

[0027] Figure 5An internal schematic diagram of a gas-controlled valve closing a normally closed gas outlet provided in an embodiment of the present application;

[0028] Figure 6 A control principle block diagram of a pressure relief control device provided in one embodiment of the present application;

[0029] Figure 7 A control principle block diagram of a pressure relief control device provided in another embodiment of the present application;

[0030] Figure 8 A schematic diagram of the pipeline connection of a pressure relief control device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0032] Pneumatic actuator: Figure 1 As shown, the working principle of the pneumatic actuator is that the pneumatic actuator includes a cylinder 201, a piston 202 and a push rod 203. The piston 202 divides the space of the cylinder 201 into a first cavity 204 and a second cavity 205. When the pressure relief valve is in a closed state, the push rod 203 of the pneumatic actuator 2 makes the piston 202 at the leftmost position of the cylinder 201, and the gas entering the second cavity 205 exerts pressure on the piston 202, so that the piston 202 has a tendency to move toward the left side wall of the cylinder 201. Under the obstruction of the left side wall of the cylinder 201, the force on the piston 202 is balanced, and the gas in the second cavity 205 remains stable, so that the pneumatic actuator is in a stable state.

[0033] When gas is delivered to the first cavity 204 through the first gas port 2041, the gas pressure in the first cavity 204 is increased, and the piston 202 is pushed to move to the right, and the gas in the second cavity 205 is discharged from the second gas port 2051, and the piston 202 drives the push rod 203 to move to the right, and the push rod 203 is rotationally connected to the pressure relief valve 1, and the rightward force of the push rod 203 opens the pressure relief valve 1; when gas is delivered to the second cavity 205 through the second gas port 2051, the gas pressure in the second cavity 205 is increased, and the piston 202 is pushed to move to the left, and the gas in the first cavity 204 is discharged from the first gas port 2041, and the piston 202 drives the push rod 203 to move to the left, and the push rod 203 is rotationally connected to the pressure relief valve 1, and the leftward force of the push rod 203 closes the pressure relief valve 1.

[0034] Solenoid valve: Figure 2 and Figure 3 As shown, a two-position five-way solenoid valve is used as an example for explanation:

[0035] The two-position five-way solenoid valve includes: a coil 501, an air inlet 502, a normally closed air outlet 503, a normally open air outlet 504, a first air outlet 505, a second air outlet 506, a pilot piston 507 and a main piston 508. When the coil 501 is in the energized state, Figure 2 As shown, the pilot piston 507 moves to the right, and the main piston 508 opens the normally closed gas outlet 503 channel, and the gas flows in from the gas inlet 502 of the solenoid valve 5 and flows out from the normally closed gas outlet 503, and the gas flows in from the normally open gas outlet 504 and flows out from the second gas outlet 506. When the coil 501 is in the de-energized state, as shown in FIG. Figure 3 As shown, the pilot piston 507 resets and moves to the left, the main piston 508 opens the normally open air outlet 504 channel, the gas flows in from the air inlet 502 of the solenoid valve and flows out from the normally open air outlet 504, and the gas flows in from the normally closed air outlet 503 of the solenoid valve and flows out from the first air outlet 505.

[0036] Pneumatic control valve: Take the two-position three-way pneumatic control valve as an example. Figure 4 and Figure 5 As shown, specifically, the air ports of the air control valve include: an air control port 301, a normally closed air outlet 302, an air inlet 303 and an air outlet 304. The working principle of the two-position three-way air control valve is as follows: Figure 4 As shown, when gas is input into the gas control port 301 of the gas control valve, the gas causes the pilot piston 305 of the gas control valve to move rightward, and the pilot piston 305 of the gas control valve is provided with a main piston 306 of the gas control valve. The main piston 306 of the gas control valve opens the normally closed gas outlet 302 channel, and the gas flows in from the gas inlet 303 of the gas control valve and flows out from the normally closed gas outlet 302; Figure 5 As shown, when the gas input to the air control port 301 of the air control valve stops, the spring will reset the pilot piston 305 of the air control valve and move to the left, and the main piston 306 of the air control valve will open the outlet 304 channel. The gas cannot flow in from the air inlet 303 of the air control valve, and the gas flows in from the normally closed outlet 302 and flows out from the outlet 304.

[0037] Steam boiler is a kind of energy conversion equipment. The energy input to the boiler includes chemical energy and electrical energy in the fuel. The boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy. The hot water or steam generated in the boiler can directly provide the required thermal energy for industrial production and people's lives, or it can be converted into mechanical energy through a steam power device, or the mechanical energy can be converted into electrical energy through a generator. The pressure relief valve is one of the three major safety accessories of the boiler and is an important safety pressure relief device. Whether it works normally is directly related to the safe operation of the boiler.

[0038] Figure 6This is a control principle block diagram of a pressure relief control device provided in one embodiment of the present application. Figure 8 A schematic diagram of the pipeline connection of a pressure relief control device provided in one embodiment of the present application is shown in FIG. Figure 1 , Figure 6 and Figure 8 As shown, the pressure relief control device comprises: a pressure relief valve 1, a pneumatic actuator 2, a first air control valve 3, a second air control valve 4, a solenoid valve 5, an air source 6 and a controller 7;

[0039] The pneumatic actuator 2 includes: a cylinder 201, a piston 202 and a push rod 203. The piston 202 divides the cylinder 201 into a first cavity 204 and a second cavity 205. The first cavity 204 is provided with a first gas port 2041, and the second cavity 205 is provided with a second gas port 2051. One end of the push rod 203 is connected to the piston 202, and the other end of the push rod 203 extends out of the second cavity 205 and is connected to the pressure relief valve 1.

[0040] The air source 6 is connected to the air inlet of the first air-controlled valve 3 and the air inlet of the second air-controlled valve 4 through the first pipeline 101 respectively, the air source 6 is connected to the air inlet 502 of the solenoid valve 5 through the second pipeline 102, the normally closed air outlet 503 of the solenoid valve 5 is connected to the air control port of the first air-controlled valve 3 through the second pipeline 102, the normally open air outlet 504 of the solenoid valve 5 is connected to the air control port of the second air-controlled valve 4 through the second pipeline 102, the control end of the solenoid valve 5 is connected to the controller 7, the normally closed air outlet of the first air-controlled valve 3 is connected to the first air port 2041 through the first pipeline 101, and the normally closed air outlet of the second air-controlled valve 4 is connected to the second air port 2051 through the first pipeline 101.

[0041] In this embodiment, since the valve core diameter of the solenoid valve 5 currently on the market is usually 1.6mm-20mm, and the valve core diameter of the air-controlled valve is usually 10mm-50mm, there are many choices for the valve core diameter of the air-controlled valve. The air-controlled valve with a suitable valve core diameter can be selected according to the gas pressure required by the pneumatic actuator 2 in the actual production requirements. When the gas pressure required by the pneumatic actuator 2 is relatively large, a gas-controlled valve with a larger valve core diameter can be selected, and there is no suitable solenoid valve 5 available. In addition, the air-controlled valve is controlled by gas, and the pressure of the gas output by the solenoid valve 5 can meet the requirements of controlling the air-controlled valve. Therefore, two air-controlled valves are added and connected between the pneumatic actuator 2 and the solenoid valve 5, namely the first air-controlled valve 3 and the second air-controlled valve 4, so as to provide sufficient gas pressure to push the piston 202 of the pneumatic actuator 2.

[0042] For example, in this embodiment, a solenoid valve 5 with a valve core diameter of 12 mm and a gas-controlled valve with a valve core diameter of 25 mm are selected to meet the production requirements of the steam boiler.

[0043] The air source 6 is connected to the air inlet 502 of the solenoid valve 5, the control end of the solenoid valve 5 is connected to the controller 7, the normally closed air outlet 503 of the solenoid valve 5 is connected to the air control port of the first air-controlled valve 3 through the second pipe 102, the normally open air outlet 504 of the solenoid valve 5 is connected to the air control port of the second air-controlled valve 4 through the second pipe 102, the normally closed air outlet of the first air-controlled valve 3 is connected to the first air port 2041 of the pneumatic actuator 2 through the first pipe 101, the normally closed air outlet of the second air-controlled valve 4 is connected to the second air port 2051 of the pneumatic actuator 2 through the first pipe 101, one end of the push rod 203 of the pneumatic actuator 2 is connected to the piston 202 of the pneumatic actuator 2, and the other end of the push rod 203 extends out of the second cavity 205 and is connected to the pressure relief valve 1.

[0044] The gas source 6 is connected to the first pipeline 101 and the second pipeline 102 respectively. The first pipeline 101 is connected to the first gas-controlled valve 3 and the second gas-controlled valve 4 that need to obtain gas from the gas source 6. The second pipeline 102 is connected to the solenoid valve 5 that needs to obtain gas from the gas source 6.

[0045] When the steam boiler is working normally, the gas pressure therein is between the upper limit and the lower limit of the gas pressure value. When the gas pressure inside the steam boiler is higher than the upper limit of the gas pressure value, the pressure relief valve 1 needs to be opened, and the controller 7 sends an opening command to the solenoid valve 5; when the gas pressure inside the steam boiler is lower than the lower limit of the gas pressure value, the pressure relief valve 1 needs to be closed, and the controller 7 sends a closing command to the solenoid valve 5.

[0046] When the steam boiler is working normally, the pressure relief valve 1 is in a closed state, the push rod 203 of the pneumatic actuator 2 makes the piston 202 at the leftmost position of the cylinder 201, the coil 501 of the solenoid valve 5 loses power, the normally open outlet 504 of the solenoid valve 5 opens, and the gas flows in from the air inlet 502 of the solenoid valve 5 and flows out from the normally open outlet 504 of the solenoid valve 5; at this time, the gas flows into the air control port of the second air control valve 4 through the second pipeline 102, and the normally closed outlet channel of the second air control valve 4 opens, and the gas will continue to enter the second cavity 205, so that the piston 202 is at the leftmost position of the cylinder 201. Under the obstruction of the left wall of the cylinder 201, the piston 202 is balanced in force. At this time, the gas stops entering the second cavity 205, and the gas provided by the gas source 6 is provided for use by other equipment. It should be noted that the gas provided by the gas source 6 is not only used for opening and closing the pressure relief valve, but also provided for use by other equipment, and other equipment is not within the scope of protection of this application.

[0047] When the controller 7 sends an opening instruction to the solenoid valve 5, the opening instruction provides an electrical signal to the solenoid valve 5, the coil 501 of the solenoid valve 5 is energized, the normally closed air outlet 503 channel of the solenoid valve 5 is opened, and the gas flows in from the air inlet 502 of the solenoid valve 5 and flows out from the normally closed air outlet 503 of the solenoid valve 5; at this time, the gas flows into the air control port of the first air-controlled valve 3 through the second pipeline 102, the normally closed air outlet channel of the first air-controlled valve 3 is opened, the gas in the first pipeline 101 flows in from the air inlet of the first air-controlled valve 3, flows out from the normally closed air outlet of the first air-controlled valve 3, and enters the first cavity 204 of the pneumatic actuator 2, the gas in the first cavity 204 pushes the piston 202 of the pneumatic actuator 2 to move right, the piston 202 drives the push rod 203 to move right, and the push rod 203 opens the pressure relief valve 1. Among them, the gas in the second cavity 205 is squeezed by the piston 202 and discharged from the second gas port 2051. The second gas port 2051 is connected to the normally closed gas outlet of the second gas control valve 4. At this time, the normally closed gas outlet of the second gas control valve 4 and the gas outlet 304 form a passage, and the gas is discharged from the pipeline through the gas outlet 304.

[0048] When the controller 7 sends a closing command to the solenoid valve 5, the closing command is to stop providing an electrical signal to the solenoid valve 5, the coil 501 of the solenoid valve 5 loses power, the normally open air outlet 504 channel of the solenoid valve 5 opens, and the gas flows in from the air inlet 502 of the solenoid valve 5 and flows out from the normally open air outlet 504 of the solenoid valve 5; at this time, the gas flows into the air control port of the second air-controlled valve 4 through the second pipeline 102, the normally closed air outlet channel of the second air-controlled valve 4 opens, the gas in the first pipeline 101 flows in from the air inlet of the second air-controlled valve 4, and flows out from the normally closed air outlet of the second air-controlled valve 4, thereby flowing into the second air port 2051 of the pneumatic actuator 2, and enters the second cavity 205 of the pneumatic actuator 2, the gas in the second cavity 205 pushes the piston 202 of the pneumatic actuator 2 to move left, the piston 202 drives the push rod 203 to move left, and the push rod 203 closes the pressure relief valve 1. Among them, the gas in the first cavity 204 is squeezed by the piston 202 and discharged from the first gas port 2041. The first gas port 2041 is connected to the normally closed gas outlet of the first gas-controlled valve 3. At this time, the normally closed gas outlet of the first gas-controlled valve 3 and the gas outlet 304 form a passage, and the gas is discharged from the pipeline through the gas outlet 304.

[0049] To summarize, the present application provides a pressure relief control device, in which the air source 6 is connected to the first pipeline 101 and the second pipeline 102 respectively, the first pipeline 101 is connected to the first air-controlled valve 3 and the second air-controlled valve 4 respectively, the second pipeline 102 is connected to the solenoid valve 5, the solenoid valve 5 is also connected to the first air-controlled valve 3 and the second air-controlled valve 4 respectively through the second pipeline 102, and the first air-controlled valve 3 and the second air-controlled valve 4 are connected to the pneumatic actuator 2 respectively through the first pipeline 101. The controller 7 controls the coil of the solenoid valve 5 to be energized or de-energized, so that the gas output by the solenoid valve 5 controls the first air-controlled valve 3 and the second air-controlled valve 4, thereby causing the first air-controlled valve 3 to deliver gas to the pneumatic actuator 2, and the second air-controlled valve 4 to deliver gas to the pneumatic actuator 2. Since the first air-controlled valve 3 and the second air-controlled valve 4 have many valve core diameter specifications and a wide selection range, it can ensure that a sufficiently large valve core diameter is provided to achieve the purpose of quickly providing gas to the pneumatic actuator 2. Therefore, when the pressure relief valve 1 needs to be opened or closed, sufficient gas pressure can be instantly provided to generate a sufficiently large torque to quickly complete the opening or closing of the pressure relief valve 1, which is beneficial to the normal operation of the pressure relief valve 1 and the pressure control of the steam boiler, thereby ensuring the safe and stable operation of the steam boiler.

[0050] like Figure 8 As shown, optionally, the diameter of the first pipe 101 is greater than the diameter of the second pipe 102 .

[0051] In this embodiment, the gas source 6 is connected to the first gas-controlled valve 3 and the second gas-controlled valve 4 through the first pipeline 101, and the first gas-controlled valve 3 and the second gas-controlled valve 4 are connected to the pneumatic actuator 2 through the first pipeline 101, the gas source 6 is connected to the solenoid valve 5 through the second pipeline 102, and the solenoid valve 5 is connected to the first gas-controlled valve 3 and the second gas-controlled valve 4 through the second pipeline 102. Since the first gas-controlled valve 3 and the second gas-controlled valve 4 provide gas to the pneumatic actuator 2, and the pneumatic actuator 2 is used to open or close the pressure relief valve 1, wherein the pressure relief valve 1 needs to be opened or closed quickly, therefore, the first gas-controlled valve 3 and the second gas-controlled valve 4 need to provide sufficient gas to the pneumatic actuator 2 in a short time, therefore, the valve core diameters of the first gas-controlled valve 3 and the second gas-controlled valve 4 are relatively large, therefore, a pipeline with a diameter matching the first gas-controlled valve 3 and the second gas-controlled valve 4 is selected to ensure that the gas delivered to the first cavity 204 or the second cavity 205 of the pneumatic actuator 2 has sufficient gas pressure, and ensure that the pressure relief valve can be opened or closed quickly.

[0052] The second pipeline 102 is connected to the solenoid valve 5, and the solenoid valve 5 is used to control the opening or closing of the first gas-controlled valve 3 and the second gas-controlled valve 4. The pressure of the gas required to control the opening or closing of the first gas-controlled valve 3 and the second gas-controlled valve 4 is relatively small, and the valve core diameter of the solenoid valve 5 is relatively small, so a pipeline with a diameter matching that of the solenoid valve 5 is selected. Therefore, in this embodiment, the diameter of the first pipeline 101 is made larger than the diameter of the second pipeline 102.

[0053] In summary, the present application makes the diameter of the first pipe 101 larger than the diameter of the second pipe 102, which not only provides the solenoid valve 5 with gas pressure that can control the opening or closing of the first air-controlled valve 3 and the second air-controlled valve 4, but also enables the first air-controlled valve 3 and the second air-controlled valve 4 to provide sufficient gas to the pneumatic actuator 2 in a short time to open or close the pressure relief valve, thereby ensuring that the pressure relief valve is opened or closed quickly and the steam boiler operates safely and stably.

[0054] Optionally, the gas source 6 is connected to the first pipeline 101 and the second pipeline 102 through a third pipeline 103, the diameter of the third pipeline 103 is larger than the diameter of the first pipeline 101, and the third pipeline 103 is provided with a first through hole and a second through hole;

[0055] The first pipe 101 is connected to the first through hole, and the second pipe 102 is connected to the second through hole. The diameter of the first through hole is greater than the diameter of the second through hole.

[0056] In this embodiment, by setting the third pipeline 103, the gas source 6 is connected to the first pipeline 101 and the second pipeline 102 respectively through the third pipeline 103, a first through hole is drilled on the third pipeline 103, and the first pipeline 101 and the first through hole are seamlessly welded, a second through hole is drilled on the third pipeline 103, and the second pipeline 102 and the second through hole are seamlessly welded, wherein the diameter of the drilled first through hole is equal to the diameter of the first pipeline 101, and the diameter of the drilled second through hole is equal to the diameter of the second pipeline 102.

[0057] In summary, by providing the first through hole and the second through hole, the first pipeline 101 and the second pipeline 102 are branched out from the third pipeline 103, which better ensures the smooth flow of gas and meets the gas pressure requirements of the solenoid valve 5 and the pneumatic actuator 2.

[0058] Figure 7 A control principle block diagram of a pressure relief control device provided in another embodiment of the present application is shown in FIG. Figure 7 As shown, optionally, the pressure relief control device further includes: a three-way valve 8;

[0059] The air source 6 is connected to the air inlet of the three-way valve 8 through the first pipeline 101, the first air outlet of the three-way valve 8 is connected to the air inlet of the first air-controlled valve 3 through the first pipeline 101, and the second air outlet of the three-way valve 8 is connected to the air inlet of the second air-controlled valve 4 through the first pipeline 101.

[0060] In this embodiment, by setting a three-way valve 8, the first pipeline 101 is connected to the air inlet of the three-way valve 8. By providing the three-way valve 8, more branches are provided for the first pipeline 101 to facilitate the connection of the first air-controlled valve 3 and the second air-controlled valve 4.

[0061] like Figure 7As shown, optionally, the pressure relief control device also includes: a gas regulating component 9, the air inlet of the gas regulating component 9 is connected to the gas source 6, and the air outlet of the gas regulating component 9 is connected to the air inlet 502 of the solenoid valve 5, the air inlet of the first air control valve 3, and the air inlet of the second air control valve 4.

[0062] In this embodiment, the gas provided by the gas source 6 may have problems such as unstable air pressure and impurity contamination. If the gas provided by the gas source 6 is directly provided to the solenoid valve 5, the first air-controlled valve 3 and the second air-controlled valve 4, the solenoid valve 5, the first air-controlled valve 3 and the second air-controlled valve 4 may be stuck or damaged. Therefore, a gas regulating component 9 is provided between the gas outlet of the gas source 6 and the air inlet 502 of the solenoid valve 5, the air inlet of the first air-controlled valve and the air inlet of the second air-controlled valve, for filtering impurities and regulating the air pressure of the gas provided by the gas source 6, so as to improve the quality of the gas provided by the gas source 6.

[0063] It should be noted that the gas regulating assembly 9 can be arranged on the first pipeline 101, or Figure 7 As shown, a gas regulating component 9 is provided on the first pipeline 101 between the first through hole and the three-way valve 8 , and on the second pipeline 102 between the second through hole and the solenoid valve 5 .

[0064] To summarize, the present application provides a gas regulating component 9 to regulate the gas provided by the gas source 6, thereby improving the quality of the gas provided by the gas source 6, making the pressure relief valve 1 more accurately and timely adjusted, while extending the service life of the solenoid valve 5, the first air-controlled valve 3 and the second air-controlled valve 4.

[0065] Optionally, the gas regulating assembly 9 includes: a filter valve;

[0066] The air inlet of the filter valve is connected to the air source 6 , and the air outlet of the filter valve is connected to the air inlet 502 of the solenoid valve 5 , the air inlet of the first air-controlled valve 3 , and the air inlet of the second air-controlled valve 4 .

[0067] In this embodiment, the filter valve is used to filter gas impurities in the gas source 6. The gas impurities may cause the solenoid valve 5, the first air-controlled valve 3 and the second air-controlled valve 4 to become stuck or damaged. The air inlet of the filter valve is connected to the gas source 6, and the air outlet of the filter valve is connected to the air inlet 502 of the solenoid valve 5, the air inlet of the first air-controlled valve 3 and the air inlet of the second air-controlled valve 4. The gas impurities in the gas source 6 are reduced after passing through the filter valve.

[0068] To summarize, the present application provides a filter valve to filter gas impurities in the gas source 6, thereby reducing the gas impurities in the gas source 6 entering the solenoid valve 5, the first air-controlled valve 3 and the second air-controlled valve 4, thereby extending the service life of the solenoid valve 5, the first air-controlled valve 3 and the second air-controlled valve 4.

[0069] Optionally, the gas regulating component 9 also includes: a pressure reducing valve, the air inlet of the pressure reducing valve is connected to the air outlet of the filter valve, and the air outlet of the pressure reducing valve is connected to the air inlet 502 of the solenoid valve 5, the air inlet of the first air control valve 3, and the air inlet of the second air control valve 4.

[0070] In this embodiment, the air inlet of the pressure reducing valve is connected to the air outlet of the filter valve, the filter valve provides gas to the pressure reducing valve, the pressure reducing valve can adjust the gas pressure, the air outlet of the pressure reducing valve is connected to the air inlet 502 of the solenoid valve 5, the air inlet of the first air-controlled valve 3, and the air inlet of the second air-controlled valve 4, the pressure reducing valve provides gas to the solenoid valve 5, the first air-controlled valve 3 and the second air-controlled valve 4, and the pressure of the gas is adjustable.

[0071] In summary, the present application provides a pressure reducing valve so that the pressure of the gas entering the solenoid valve 5, the first gas-controlled valve 3 and the second gas-controlled valve 4 can be adjusted.

[0072] Optional, such as Figure 7 As shown, the pressure relief control device also includes: a pressure detection component 10, and the pressure detection component 10 is connected to the controller 7.

[0073] In this embodiment, the pressure detection component 10 is installed on the steam boiler, and the pressure detection component 10 is electrically connected to the controller 7. The pressure detection component 10 detects the gas pressure inside the steam boiler in real time and sends the detected gas pressure to the controller 7. The upper limit and lower limit of the gas pressure value of the steam boiler are set in the controller 7 through program entry. When the pressure detection component 10 detects that the gas pressure inside the steam boiler is higher than the upper limit of the gas pressure value, the pressure relief valve 1 needs to be opened, and the controller 7 sends an opening command to the solenoid valve 5; when the pressure detection component 10 detects that the gas pressure inside the steam boiler is lower than the lower limit of the gas pressure value, the pressure relief valve 1 needs to be closed, and the controller 7 sends a closing command to the solenoid valve 5.

[0074] In summary, the present application sets a pressure detection component 10 to monitor the internal gas pressure of the steam boiler in real time. The controller 7 controls the pressure relief valve 1 to open or close according to the current gas pressure, thereby realizing automatic control of the opening or closing of the pressure relief valve 1.

[0075] Optionally, the pressure detection assembly 10 further includes: a pressure transmitter;

[0076] The pressure transmitter is connected to the controller 7 .

[0077] In this embodiment, the pressure transmitter includes: a pressure sensor and a pressure conversion circuit. The pressure sensor collects the current pressure value in the steam boiler, and converts the pressure value in the steam boiler into a transmittable electrical signal through the pressure conversion circuit, and transmits the electrical signal corresponding to the pressure value to the controller 7, so that the controller 7 can identify the real-time gas pressure in the current steam boiler. The upper limit and lower limit of the gas pressure value of the steam boiler are set in the controller 7 through program input. The controller 7 determines whether the current pressure value is higher than the set upper limit of the gas pressure value or lower than the set lower limit of the gas pressure value, thereby controlling the pressure relief valve 1 to open or close. When the gas pressure inside the steam boiler is higher than the upper limit of the gas pressure value, the pressure relief valve 1 needs to be opened, and the controller 7 sends an opening instruction to the solenoid valve 5; when the gas pressure inside the steam boiler is lower than the lower limit of the gas pressure value, the pressure relief valve 1 needs to be closed, and the controller 7 sends a closing instruction to the solenoid valve 5.

[0078] In summary, the present application monitors the gas pressure in the steam boiler in real time by setting a pressure transmitter, converts the gas pressure value into a transmittable electrical signal, facilitates the operation of the controller 7, and realizes automatic control of the opening or closing of the pressure relief valve 1.

[0079] It should be noted that this application is described using a steam boiler as an example, but this application does not limit the application scenarios of the pressure relief valve.

[0080] It should be noted that this application is based on Figure 1 The pneumatic actuator shown is used as an example for description, but the present application does not limit the type of pneumatic actuator.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pressure relief control device, characterized in that: include: Pressure relief valve, pneumatic actuator, first air control valve, second air control valve, solenoid valve, air source and controller; The pneumatic actuator comprises: a cylinder, a piston and a push rod, wherein the piston divides the cylinder into a first cavity and a second cavity, the first cavity is provided with a first air port, the second cavity is provided with a second air port, one end of the push rod is connected to the piston, and the other end of the push rod extends out of the second cavity and is connected to the pressure relief valve; The air source is connected to the air inlet of the first air-controlled valve and the air inlet of the second air-controlled valve respectively through the first pipeline, the air source is connected to the air inlet of the solenoid valve through the second pipeline, the normally closed air outlet of the solenoid valve is connected to the air control port of the first air-controlled valve through the second pipeline, the normally open air outlet of the solenoid valve is connected to the air control port of the second air-controlled valve through the second pipeline, the control end of the solenoid valve is connected to the controller, the normally closed air outlet of the first air-controlled valve is connected to the first air port through the first pipeline, and the normally closed air outlet of the second air-controlled valve is connected to the second air port through the first pipeline.

2. The pressure relief control device according to claim 1, characterized in that: The diameter of the first pipe is greater than the diameter of the second pipe.

3. The pressure relief control device according to claim 2, characterized in that: The gas source is connected to the first pipeline and the second pipeline through a third pipeline, the diameter of the third pipeline is larger than the diameter of the first pipeline, and the third pipeline is provided with a first through hole and a second through hole; The first pipe is connected to the first through hole, the second pipe is connected to the second through hole, and the diameter of the first through hole is greater than the diameter of the second through hole.

4. The pressure relief control device according to claim 1, characterized in that: Also includes: Three-way valve; The air source is connected to the air inlet of the three-way valve through the first pipeline, the first air outlet of the three-way valve is connected to the air inlet of the first air-controlled valve through the first pipeline, and the second air outlet of the three-way valve is connected to the air inlet of the second air-controlled valve through the first pipeline.

5. The pressure relief control device according to claim 1, characterized in that: It also includes: a gas regulating component, the air inlet of the gas regulating component is connected to the gas source, and the air outlet of the gas regulating component is connected to the air inlet of the solenoid valve, the air inlet of the first air-controlled valve, and the air inlet of the second air-controlled valve.

6. The pressure relief control device according to claim 5, characterized in that: The gas regulating assembly includes: a filter valve; The air inlet of the filter valve is connected to the air source, and the air outlet of the filter valve is connected to the air inlet of the solenoid valve, the air inlet of the first air-controlled valve, and the air inlet of the second air-controlled valve.

7. The pressure relief control device according to claim 6, characterized in that: The gas regulating assembly also includes: a pressure reducing valve, the air inlet of the pressure reducing valve is connected to the air outlet of the filter valve, and the air outlet of the pressure reducing valve is connected to the air inlet of the solenoid valve, the air inlet of the first air-controlled valve, and the air inlet of the second air-controlled valve.

8. The pressure relief control device according to any one of claims 1 to 7, characterized in that: Also includes: A pressure detection component is connected to the controller.

9. The pressure relief control device according to claim 8, characterized in that: The pressure detection assembly includes: a pressure transmitter; The pressure transmitter is connected to the controller.

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