Redundant electromagnetic valve system

Abstract

The utility model belongs to the technical field of electromagnetic valve control, and relates to a redundant electromagnetic valve system which comprises a main electromagnetic valve, a redundant electromagnetic valve, a pneumatic execution assembly and a controller. The main electromagnetic valve is provided with a main air inlet and a main air outlet; the redundant electromagnetic valve is provided with a redundant air inlet, a standby air inlet and a redundant air outlet, and the redundant air inlet is connected with the main air inlet in series; the pneumatic execution assembly is communicated with the redundant air outlet; the controller is electrically connected with the main electromagnetic valve and the redundant electromagnetic valve; according to the utility model, the main air outlet is communicated with the redundant air inlet, compressed air is introduced into the main air inlet, and compressed air is introduced into the standby air inlet, so that a one-with-two redundant electromagnetic valve configuration is formed. The main electromagnetic valve and the redundant electromagnetic valve operate at the same time and do not interfere with each other, even if one electromagnetic valve breaks down, the other electromagnetic valve can still act normally, the reliability of the redundant electromagnetic valve system is improved, then the stop valve can be normally opened and closed according to instructions, and the stability of the synthesis gas flow is ensured.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve control technology, specifically to a redundant electromagnetic valve system. Background Technology

[0002] In the ethylene glycol synthesis process, the shut-off valve, as a key control device on the syngas pipeline, directly affects the safety, stability, and production efficiency of the ethylene glycol unit. Shut-off valves are typically controlled by solenoid valves, which precisely regulate the flow of syngas to ensure a smooth and efficient reaction process. As the core control component of the shut-off valve, the performance of the solenoid valve directly determines its response speed, operational stability, and long-term reliability.

[0003] Existing technology has some research on solenoid valve systems. See patent document CN202021160638.9, which discloses a solenoid valve control system. This system connects to a 0.5-0.8 MPa air source via an inlet ball valve and uses a pressure gauge to monitor the upstream air source pressure in real time. The right port of the inlet ball valve is connected to a pressure regulating valve to adjust the downstream air source pressure. The other port of the pressure regulating valve is connected to a flow-limiting nozzle via a pipe to prevent a sharp drop in system air pressure after electric opening. The other end of the flow-limiting nozzle is connected to a first check valve to prevent the deluge valve main valve from resetting. The right port of the first check valve is connected to a port of the solenoid valve via a pipe to control the on / off of the downstream air source. The other port of the solenoid valve is connected to a pneumatically controlled pilot valve via a pipe, and a pressure gauge displays the real-time downstream air path pressure. The pneumatically controlled pilot valve is responsible for regulating the water pressure inside the valve chamber when it is opened or closed.

[0004] However, solenoid valves have a complex structure and operate in harsh environments. During long-term operation, they still face certain risks of failure. If a solenoid valve malfunctions or fails, the shut-off valve will be unable to open or close normally according to instructions, triggering the interlock protection mechanism. The shut-off valve will be forcibly closed, preventing the normal flow of syngas and resulting in an abnormally low syngas flow rate. Utility Model Content

[0005] To address the technical problem in the background art where the shut-off valve cannot open and close normally according to the command after the solenoid valve malfunctions or fails, thus leading to an abnormal reduction in the synthesis gas flow rate, this utility model provides a redundant solenoid valve system.

[0006] This utility model relates to a redundant solenoid valve system. The main air outlet is connected to a redundant air inlet, with compressed air flowing through both the main and backup inlets. This provides the solenoid valve system with two independent airflow paths, forming a configuration of one main solenoid valve and two redundant solenoid valves. The main solenoid valve and the redundant solenoid valves operate simultaneously without interference. Even if one solenoid valve fails, the other can still operate normally, ensuring the normal operation of the system. This avoids production accidents caused by single-point failure, improves the reliability of the redundant solenoid valve system, and allows the shut-off valve to open and close normally according to instructions, ensuring the stability of the syngas flow.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0008] A redundant solenoid valve system includes a main solenoid valve, redundant solenoid valves, a pneumatic actuator, and a controller. The main solenoid valve has a main air inlet and a main air outlet, with the main air inlet connected to a compressed air source. The redundant solenoid valves have a redundant air inlet, a spare air inlet, and a redundant air outlet, with the redundant air inlet connected in series with the main air inlet and the spare air inlet connected to the compressed air source. The pneumatic actuator is connected to the redundant air outlet. The controller is electrically connected to both the main solenoid valve and the redundant solenoid valves, and controls the flow of compressed air to the pneumatic actuator by controlling the on / off states of the main solenoid valve and the redundant solenoid valves.

[0009] In one specific implementation, the pneumatic actuator includes a cylinder and a valve stem; the cylinder inlet is connected to a redundant outlet; the valve stem is connected to the cylinder piston rod and is used to perform opening or closing actions under the drive of the cylinder piston rod.

[0010] In one specific implementation, the gas actuator further includes a return spring; the return spring is located inside the cylinder and is connected to the valve stem.

[0011] In one specific implementation, the main solenoid valve and the redundant solenoid valve are electrically connected to the controller via a three-way junction box.

[0012] In one specific implementation, the main solenoid valve and the redundant solenoid valve are respectively connected to the three-way junction box via a first connecting line and a second connecting line.

[0013] In one specific implementation, an intermediate junction box is provided between the controller and the three-way junction box.

[0014] In one specific implementation, the three-way junction box is connected to the intermediate junction box via a third connecting line.

[0015] In one specific implementation, the controller is connected to the intermediate junction box via a fourth connection line.

[0016] In one specific implementation, the redundant air outlet is connected to the air inlet of the pneumatic actuator via a third air supply line.

[0017] In one specific implementation, the redundant solenoid valve system further includes an air supply assembly, which includes a main air supply pipeline and a first air supply pipeline and a second air supply pipeline both connected to the main air supply pipeline; the first air supply pipeline is connected to the main air inlet, and the second air supply pipeline is connected to the backup air inlet; the main air supply pipeline is connected to the air supply equipment.

[0018] In summary, this utility model has the following beneficial technical effects:

[0019] 1. This utility model relates to a redundant solenoid valve system. The main air outlet is connected to a redundant air inlet, with compressed air flowing through both the main and backup inlets. This provides the solenoid valve system with two independent airflow paths, forming a configuration of one main solenoid valve and two redundant solenoid valves. The main solenoid valve and the redundant solenoid valves operate simultaneously without interference. Even if one solenoid valve fails, the other can still operate normally, ensuring the normal operation of the solenoid valve system. This avoids production accidents caused by single-point failure, improves the reliability of the redundant solenoid valve system, and enables the shut-off valve to open and close normally according to instructions, ensuring the stability of the syngas flow rate.

[0020] 2. This utility model's redundant solenoid valve system achieves electrical connection between the main solenoid valve, redundant solenoid valves, and the controller via a first connecting line, a second connecting line, and a three-way junction box. The connection method is convenient to operate and low-cost, eliminating the need for complex electrical wiring and reducing the installation and maintenance costs of the redundant solenoid valve system.

[0021] 3. In this utility model's redundant solenoid valve system, the reset spring works in conjunction with the valve stem and the piston rod of the cylinder. When the main solenoid valve and the redundant solenoid valve are working normally, the reset spring is in a compressed state, ensuring that the shut-off valve can open in a timely manner. When both the main solenoid valve and the redundant solenoid valve malfunction, the reset spring returns to its original length, driving the valve stem back to its original position. This shuts off the synthesis gas pipeline, preventing leakage of hazardous gases and improving the safety and reliability of the redundant solenoid valve system. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the redundant solenoid valve system of this utility model.

[0023] Explanation of reference numerals in the attached diagram: 1. Main solenoid valve; 2. Redundant solenoid valve; 3. Return spring; 4. Cylinder; 5. Valve stem; 6. Controller; 7. Three-way junction box; 8. Intermediate junction box; 9. First connecting line; 10. Second connecting line; 11. Third connecting line; 12. Fourth connecting line; 13. Main air supply line; 14. First air supply line; 15. Second air supply line. Detailed Implementation

[0024] The technical solution of this utility model will be further explained and described below with reference to the accompanying drawings and embodiments, but this utility model is not limited to the embodiments described below.

[0025] This utility model relates to a redundant solenoid valve system. The main air outlet is connected to a redundant air inlet, with compressed air flowing through both the main and backup inlets. This provides the solenoid valve system with two independent airflow paths, forming a configuration of one main solenoid valve and two redundant solenoid valves. The main solenoid valve 1 and the redundant solenoid valve 2 operate simultaneously without interference. Even if one solenoid valve fails, the other can still operate normally, ensuring the normal operation of the solenoid valve system. This avoids production accidents caused by single-point failure, improves the reliability of the redundant solenoid valve system, and enables the shut-off valve to open and close normally according to instructions, ensuring the stability of the syngas flow rate.

[0026] Example 1:

[0027] Reference Figure 1 A redundant solenoid valve system is disclosed for the safety control of shut-off valves in an ethylene glycol synthesis process. The system includes a main solenoid valve 1, a redundant solenoid valve 2, a pneumatic actuator, and a controller 6. The main solenoid valve 1 has a main air inlet and a main air outlet, the main air inlet being connected to a compressed air source. The redundant solenoid valve 2 has a redundant air inlet, a spare air inlet, and a redundant air outlet, the redundant air inlet being connected in series with the main air inlet, and the spare air inlet being connected to the compressed air source. The pneumatic actuator is connected to the redundant air outlet. The controller 6 is electrically connected to both the main solenoid valve 1 and the redundant solenoid valve 2. The controller 6 controls the flow of compressed air to the pneumatic actuator by controlling the on / off states of the main solenoid valve 1 and the redundant solenoid valve 2.

[0028] Specifically, in the ethylene glycol synthesis process, a shut-off valve is installed on the syngas pipeline, and a pneumatic actuator is connected to the shut-off valve. The position of the shut-off valve is adjusted by the pneumatic actuator, thereby regulating the flow rate of the syngas pipeline.

[0029] More specifically, the redundant air outlet is connected to the air inlet of the pneumatic actuator through a third air supply pipeline, and the length of the third air supply pipeline ranges from 1.5m to 2.5m.

[0030] More specifically, the controller 6 is a PLC-200, which is a commonly used solenoid valve controller in the prior art.

[0031] Reference Figure 1 The pneumatic actuator includes a return spring 3, a cylinder 4, and a valve stem 5. The air inlet of the cylinder 4 is connected to a redundant air outlet; the return spring 3 is placed inside the cylinder 4 and is connected to the valve stem 5; the valve stem 5 is connected to the piston rod of the cylinder 4 and is used to perform opening or closing actions under the drive of the piston rod of the cylinder 4; wherein, moving the valve stem 5 away from the synthesis gas pipeline is an opening action, and moving the valve stem 5 closer to the synthesis gas pipeline is a closing action.

[0032] In this embodiment, the reset spring 3 cooperates with the valve stem 5 and the piston rod of the cylinder 4. When the main solenoid valve 1 and the redundant solenoid valve 2 are working normally, the reset spring 3 is in a compressed state, and the valve stem 5 drives the shut-off valve to move away from the synthesis gas pipeline, increasing the flow rate of the synthesis gas pipeline. When both the main solenoid valve 1 and the redundant solenoid valve 2 malfunction, the reset spring 3 returns to its original length, and the reset spring 3 drives the valve stem 5 back to its original position. The valve stem 5 moves closer to the synthesis gas pipeline, reducing the flow rate of the synthesis gas pipeline to a non-flowing state, thereby preventing the leakage of hazardous gases and improving the safety and reliability of the redundant solenoid valve system.

[0033] Reference Figure 1 The main solenoid valve 1 and the redundant solenoid valve 2 are electrically connected to the controller 6 via a three-way junction box 7. The three-way junction box 7 can be a plastic, metal, or explosion-proof junction box. Preferably, the three-way junction box 7 is explosion-proof to facilitate safe use in environments where flammable and explosive gases may be present, such as the ethylene glycol synthesis process. Connecting both the main solenoid valve 1 and the redundant solenoid valve 2 simultaneously via the three-way junction box 7 simplifies wiring connections, reduces wiring errors, and improves the reliability and maintainability of the redundant solenoid valve system.

[0034] Reference Figure 1 The main solenoid valve 1 and the redundant solenoid valve 2 are connected to the three-way junction box 7 via a first connecting line 9 and a second connecting line 10, respectively. The lengths of the first connecting line 9 and the second connecting line 10 range from 0.8m to 1.2m. Specifically, the lengths of the first connecting line 9 and the second connecting line 10 can be 0.8m, 1.0m, or 1.2m. The lengths of the first connecting line 9 and the second connecting line 10 are selected based on the actual installation distance between the main solenoid valve 1 and the redundant solenoid valve 2 and the three-way junction box 7, ensuring reliable connection and stable signal transmission. Preferably, the lengths of both the first connecting line 9 and the second connecting line 10 are 1.0m.

[0035] In this embodiment, by simply adding a redundant solenoid valve 2 and a 1.0m long first connecting line 9 and a second connecting line 10 to the solenoid valve system, a configuration with two redundant solenoid valves 2 can be formed. The main solenoid valve 1 and the redundant solenoid valve 2 operate simultaneously without interfering with each other. Even if one solenoid valve fails, the other solenoid valve can still operate normally without affecting the normal operation of the solenoid valve system. This avoids production accidents caused by single-point failure and improves the reliability of the redundant solenoid valve system.

[0036] Reference Figure 1 An intermediate junction box 8 is provided between the controller 6 and the three-way junction box 7. In the ethylene glycol synthesis process, due to the wide distribution of equipment, the distance between the controller 6 and the three-way junction box 7 is relatively long. Direct connection would lead to problems such as excessively long lines and signal attenuation. However, by setting an intermediate junction box 8 between the controller 6 and the three-way junction box 7, the signal can be relayed and amplified, ensuring the stability and reliability of signal transmission.

[0037] Reference Figure 1 The three-way junction box 7 is connected to the intermediate junction box 8 via a third connecting line 11, and the length of the third connecting line 11 ranges from 30m to 70m. Specifically, the length of the third connecting line 11 can be 30m, 50m, or 70m, and the length of the third connecting line 11 is selected according to the actual installation distance between the three-way junction box 7 and the intermediate junction box 8 to ensure signal transmission quality; preferably, the length of the third connecting line 11 is 50m.

[0038] Reference Figure 1 The controller 6 is connected to the intermediate junction box 8 via a fourth connecting line 12, the length of which ranges from 800m to 1200m. Specifically, the length of the fourth connecting line 12 can be 800m, 1000m, or 1200m, selected according to the actual installation distance between the controller 6 and the intermediate junction box 8, ensuring accurate and stable signal transmission; preferably, the length of the fourth connecting line 12 is 1000m.

[0039] Example 2:

[0040] Reference Figure 1In this embodiment, the redundant solenoid valve system, based on Embodiment 1, further includes an air supply assembly. The air supply assembly includes a main air supply line 13 and a first air supply line 14 and a second air supply line 15, both connected to the main air supply line 13. The first air supply line 14 is connected to the main air inlet, and the second air supply line 15 is connected to a backup air inlet. The main air supply line 13 is connected to an air supply device. The type of air supply device is not limited; any device that supplies compressed air to the main air supply line 13 can be used. Furthermore, the air supply device is a commercially available device known to those skilled in the art, and therefore will not be described in detail here.

[0041] The working principle of this utility model of a redundant solenoid valve system is as follows: the controller 6 controls the main solenoid valve 1 to be in the open state and the redundant solenoid valve 2 to be in the closed state. Compressed air enters the first air supply line 14 through the autonomous air supply line 13. The compressed air in the first air supply line 14 enters the main solenoid valve 1 through the autonomous air inlet and flows out through the autonomous air outlet. The compressed air flowing out of the autonomous air outlet enters the redundant solenoid valve 2 through the redundant air inlet and flows out through the redundant air outlet. The compressed air from the redundant air outlet goes to the cylinder 4 through the third air supply line. The compressed air pushes the piston rod of the cylinder 4 to move. The piston rod of the cylinder 4 pushes the valve rod 5. The valve rod 5 drives the shut-off valve to move away from the synthesis gas pipeline, and the flow rate of the synthesis gas pipeline increases.

[0042] When the main solenoid valve 1 fails, the controller 6 controls the redundant solenoid valve 2 to be in the open state, and the compressed air enters the second air supply line 15 through the self-supply line 13; the compressed air in the second air supply line 15 enters the redundant solenoid valve 2 through the spare air inlet and flows out through the redundant air outlet; the compressed air from the redundant air outlet goes to the cylinder 4 through the third air supply line, and the compressed air pushes the piston rod of the cylinder 4 to move. The piston rod of the cylinder 4 pushes the valve rod 5, and the valve rod 5 drives the shut-off valve to move away from the synthesis gas pipeline, thereby increasing the flow rate of the synthesis gas pipeline.

[0043] When both the main solenoid valve 1 and the redundant solenoid valve 2 fail, the compressed air in the cylinder 4 is exhausted, the return spring 3 returns to its original length, the return spring 3 drives the valve stem 5 back to its original position, the valve stem 5 moves to the side closer to the synthesis gas pipeline, the flow of the synthesis gas pipeline is reduced to a non-flowing state, and dangerous gas leakage is prevented.

[0044] The preferred embodiments of this utility model are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A redundant solenoid valve system, characterized by, The application relates to a redundant solenoid valve system. The system comprises a main solenoid valve (1), a redundant solenoid valve (2), a pneumatic actuating assembly and a controller (6). The main solenoid valve (1) has a main air inlet and a main air outlet, and the main air inlet is connected to a compressed air source. The redundant solenoid valve (2) has a redundant air inlet, a standby air inlet and a redundant air outlet, the redundant air inlet is connected in series with the main air inlet, and the standby air inlet is connected to the compressed air source. The pneumatic actuating assembly is communicated with the redundant air outlet. The controller (6) is electrically connected with the main solenoid valve (1) and the redundant solenoid valve (2), and the controller (6) controls the compressed air flow to the pneumatic actuating assembly by controlling the opening and closing states of the main solenoid valve (1) and the redundant solenoid valve (2).

2. The redundant solenoid valve system of claim 1, wherein: The pneumatic actuating assembly comprises a cylinder (4) and a valve rod (5). The cylinder (4) is communicated with the redundant air outlet at an air inlet end. The valve rod (5) is connected with a piston rod of the cylinder (4) and is used for executing opening or closing actions under the driving of the piston rod of the cylinder (4).

3. The redundant solenoid valve system of claim 2, wherein: The pneumatic actuating assembly further comprises a reset spring (3). The reset spring (3) is arranged in the cylinder (4) and connected with the valve rod (5).

4. The redundant solenoid valve system of claim 2 or 3, wherein: The main solenoid valve (1) and the redundant solenoid valve (2) are electrically connected with the controller (6) through a three-way junction box (7).

5. The redundant solenoid valve system of claim 4, wherein: The main solenoid valve (1) and the redundant solenoid valve (2) are connected with the three-way junction box (7) through first connecting wires (9) and second connecting wires (10) respectively.

6. The redundant solenoid valve system of claim 4, wherein: An intermediate junction box (8) is arranged between the controller (6) and the three-way junction box (7).

7. The redundant solenoid valve system of claim 6, wherein: The three-way junction box (7) is connected with the intermediate junction box (8) through third connecting wires (11).

8. The redundant solenoid valve system of claim 6, wherein: The controller (6) is connected with the intermediate junction box (8) through fourth connecting wires (12).

9. The redundant solenoid valve system of claim 1, wherein: The redundant air outlet is communicated with the air inlet end of the pneumatic actuating assembly through a third air supply pipeline.

10. The redundant solenoid valve system of claim 1, wherein: The redundant solenoid valve system further comprises an air supply assembly, and the air supply assembly comprises a main air supply pipeline (13) and first and second air supply pipelines (14) and (15) communicated with the main air supply pipeline (13). The first air supply pipeline (14) is communicated with the main air inlet, and the second air supply pipeline (15) is communicated with the standby air inlet. The main air supply pipeline (13) is communicated with an air supply device.

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