Redundant pilot-operated solenoid valve capable of being maintained on line

Abstract

A redundant pilot-operated type electromagnetic valve capable of being maintained on line comprises a first pilot-operated type electromagnetic valve, a second pilot-operated type electromagnetic valve, a third pilot-operated type electromagnetic valve, a mechanical valve and a reversing shuttle valve. Stop valves are connected to inlet pipelines of the first to third pilot-operated solenoid valves in series, the first and second pilot-operated solenoid valves are connected in parallel, outlets of the first and second pilot-operated solenoid valves are connected to a first port and a second port of a reversing shuttle valve through gas paths, and a third port of the reversing shuttle valve is connected to an inlet of a third pilot-operated solenoid valve. A one-way valve is connected to the first pilot-operated type electromagnetic valve in series. The mechanical valve is a valve with two inlets and two outlets, a first outlet of the first pilot-operated type electromagnetic valve is connected with a first inlet of the mechanical valve, a first outlet of the second pilot-operated type electromagnetic valve is connected with a second inlet of the mechanical valve, and the second inlet of the mechanical valve is provided with a flow channel which is communicated to the first outlet of the mechanical valve and connected to a second inlet of the second reversing shuttle valve.

Description

Technical Field

[0001] The utility model relates to a pilot-operated electromagnetic valve, in particular to a redundant pilot-operated electromagnetic valve which can be maintained online. Background Art

[0002] A pilot-operated solenoid valve is one that, when powered on, Electromagnetic force Lift the valve stem and the pilot valve port opens. At this time, the upper chamber of the solenoid valve releases pressure through the pilot hole. Valve core A pressure difference is formed around the valve, and the fluid pressure pushes the main valve core upward to open the main valve port. When the power is off, the valve stem is reset under the action of the spring force and the gravity of the main valve core, the pilot hole is closed, the main valve core moves downward, and the main valve port is closed. The pressure in the upper chamber of the solenoid valve increases, and the fluid pressure pressurizes the main valve core, which makes the seal better. For the sake of insurance, the redundant system adopts two or more sets of independently configured hardware, software or design systems to run simultaneously to prevent the entire system from working normally when one of the systems fails.

[0003] At present, the 2OO3 redundant system is widely used in the market. In this system, as long as any two sets of solenoid valves can operate normally among the three sets of solenoid valves, the whole system can operate normally. The 2OO3 solenoid valve redundant system on the market actually has four solenoid valves (SOLENOID VALVE1, SOLENOID VALVE2, SOLENOID VALVE3, SOLENOID VALVE4), and these four solenoid valves are equipped with four solenoid coils to control the actions of the corresponding solenoid valves. In order to control each solenoid valve individually, it is necessary to equip it with four switch signals. Therefore, users need four sets of signal lines for on-site use, which will lead to a series of risks such as increased user costs, messy and complex on-site wiring, and increased safety hazards of leakage. When the user has only three switch signals, the only way is to connect two of the solenoid valves in parallel so that the two solenoid valves are combined into a new solenoid valve. However, such treatment will still cause some risks such as increased costs.

[0004] CN213982226U discloses a pilot solenoid valve with a redundant structure, including a valve body and a valve core, a valve cavity is arranged in the valve body, the valve core is movably and sealably installed in the valve cavity, and also includes at least two solenoid valve blocks, the valve body is provided with an air inlet port, an air outlet port and a first exhaust port, the air outlet port and the first exhaust port are both connected to the valve cavity, a main air passage is arranged in the valve body, at least two branch air passages are arranged between the main air passage and the air inlet port, the solenoid valve block is installed on the valve body, and the solenoid valve block is used to block the branch air passages; the valve core controls the opening and closing of the air inlet port and the air outlet port and the air inlet port and the first exhaust port through its own movement, when the air inlet port is connected with the air outlet port, the air inlet port is not connected with the first exhaust port, and when the air inlet port is not connected with the air outlet port, the air inlet port is connected with the first exhaust port.

[0005] However, the utility model patent disclosed above is actually a 2OO2 structure. There are actually only two solenoid valve blocks in this structure, and for the ventilation of the entire main circuit, there are only three modes: ① Solenoid valve block 1 is powered, solenoid valve block 2 is not powered; ② Solenoid valve block 1 is not powered, solenoid valve block 2 is powered; ③ Solenoid valve block 1 is powered, solenoid valve block 2 is powered; and the solenoid valve described in this patent has a fault in the system. When it needs to be replaced and maintained, the main flow channel must be cut off first (which will cause the production line to stop) before replacement can be carried out, and it does not have the function of online replacement.

[0006] In order to achieve a higher fault tolerance rate of the system, reduce the cost of the 2OO3 redundant system, reduce the safety hazard of leakage and improve the wiring on site. The utility model adopts a new flow channel design and integrates three pilot solenoid valves (hereinafter referred to as solenoid valves) at the corresponding flow channel points. It is only necessary to equip these three solenoid valves with switch signals. At the same time, a ball valve or a stop valve is set at the front end of the three pilot solenoid valves. When any solenoid valve in the system is abnormal, there is no need to shut down the production line. The abnormal solenoid valve can be directly replaced online to reduce production costs. Utility Model Content

[0007] The purpose of this utility model is to achieve a higher fault tolerance rate of the system, reduce the cost of the 2OO3 redundant system, reduce the safety hazard of leakage and improve the wiring on site. At the same time, it also solves the problem that the redundant system of the pilot solenoid valve cannot be maintained online. The solution proposes to add a ball valve or a stop valve in front of the solenoid valve.

[0008] The technical scheme of the utility model is a redundant pilot solenoid valve that can be maintained online, including three pilot solenoid valves from the first to the third, a mechanical valve, and a reversing shuttle valve; the inlet pipelines of the three pilot solenoid valves from the first to the third are connected in series with a stop valve or a ball valve, the first and second pilot solenoid valves are connected in parallel, the outlets of the first and second pilot solenoid valves are connected to the first and second ports of the reversing shuttle valve through an air path, the third port of the reversing shuttle valve is connected to the inlet of the third pilot solenoid valve, and a check valve is connected in series at the front end of the first pilot solenoid valve and at the rear end of the stop valve or the ball valve; the mechanical valve is a valve with two inlets and two outlets, the first outlet of the first pilot solenoid valve is connected to the first inlet of the mechanical valve, the first outlet of the second pilot solenoid valve is connected to the second inlet of the mechanical valve, and the second inlet of the mechanical valve has a flow channel connected to the first outlet of the mechanical valve and connected to the second inlet of the second reversing shuttle valve. The second outlets of the first and second pilot solenoid valves are interconnected and connected to a muffler; the second outlet of the mechanical valve is interconnected with the second outlet of the third pilot solenoid valve and connected to a muffler. The first outlet of the third pilot solenoid valve is connected to the first inlet of the second reversing shuttle valve. The cut-off valve in series is a ball valve. When a valve body in the system is abnormal and needs to be replaced and maintained, the corresponding front end ball valve or cut-off valve can be closed and then replaced. The working state of the control flow channel is maintained.

[0009] The shuttle valve can be understood as a spherical piston added to the tee. When there is abnormally no fluid in the valve body at the front end of the air inlet 1, the fluid at the air inlet 2 will push the spherical piston to move toward port 1, thereby sealing port 1.

[0010] The left end of V1, V2, and V3 is the exhaust end. Its function is that when the valve body is closed, the fluid inside the outlet end can be discharged through this port without causing suffocation.

[0011] In order to realize a truly 2OO3 redundant system, this solution adopts a new flow channel design and integrates three pilot solenoid valves (hereinafter referred to as solenoid valves) at the corresponding flow channel points. Only switching signals need to be equipped for these three solenoid valves.

[0012] Beneficial effects: The features of the 2OO3 pilot solenoid valve redundant system of the utility model are:

[0013] 1. There are only three pilot solenoid valves in the system. Only switching signals need to be provided to these three solenoid valves, which can achieve lower costs.

[0014] 2. A mechanical valve body is integrated in the system, so that when any two of the three pilot solenoid valves are in normal state, the normal operation of the entire system can be guaranteed.

[0015] 3. Designing a one-way valve on the pilot air path of SOLENOID VALVE1 can ensure that no blowby gas will be generated on the pilot air path of SOLENOID VALVE1.

[0016] 4. A SHUT VALVE is designed in the system to realize automatic switching operation of the two gas lines.

[0017] 5. The springs inside the pilot solenoid valve and mechanical valve body adopt a long-life anti-fatigue design, which can make the service life of the valve body more than 10 million times.

[0018] 6. When a valve body is abnormal, it can be replaced when the system is operating normally.

[0019] 2OO3 pilot solenoid valve system gas circuit design: The utility model can realize a true 2OO3 redundant system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the gas circuit (fluid circuit) of the pilot-operated solenoid valve system of the utility model.

[0021] Figure 2 This is a schematic diagram of the faulty gas circuit structure of the pilot solenoid valve V3 of the pilot solenoid valve system of the utility model;

[0022] Figure 3 This is a schematic diagram of the faulty gas circuit structure of the pilot solenoid valve V2 of the pilot solenoid valve system of the utility model;

[0023] Figure 4 This is a schematic diagram of the faulty gas circuit structure of the pilot solenoid valve V1 of the pilot solenoid valve system of the utility model; DETAILED DESCRIPTION

[0024] like Figure 1 As shown, it includes three pilot solenoid valves V1, V2, V3, a mechanical valve MV, a reversing shuttle valve S1; a stop valve (ball valves B1, B2, B3), a reversing shuttle valve S1, and a second reversing shuttle valve S2. A second reversing shuttle valve is provided, and the first and second ports of the second reversing shuttle valve are respectively connected to the outlet of the third pilot solenoid valve and the outlet of the mechanical valve, and the third port (outlet) of the second shuttle valve is the outlet of the gas circuit.

[0025] The one-way valve NRV, the total inlet of the gas circuit (the lower part of the figure) INLET, the total outlet of the gas circuit (the upper part of the figure) OUTLET, the second shuttle valve or even the shuttle valve can be understood as a spherical piston added to the three-way. When the valve body at the front end of the air inlet 1 is abnormally free of fluid, the fluid at the air inlet 2 will push the spherical piston to move to port 1, thereby sealing port 1. The left end of V1, V2, and V3 in the figure is the exhaust end. Its function is that when the valve body is closed, the fluid inside the outlet end can be discharged through this port without causing suffocation. The four ports ABCD are pressure indicators, and their function is to inform customers through pressure indicators whether there are any abnormalities in the three solenoid valves and mechanical valves.

[0026] 1. Figure 2 As shown, gas circuit description:

[0027] When the input end (INLET) is ventilated, the thick solid line generates air pressure. When SOLENOID VALVE1, i.e., V1, and SOLENOID VALVE2, i.e., V2, can ventilate normally, and SOLENOID VALVE3, i.e., V3, is abnormal, the medium flowing through the solenoid valve V1 opens and enters the sealing chamber of the mechanical valve MV, thereby opening the flow channel of the mechanical valve MV. At the same time, the medium flowing through the solenoid valve V2 opens and enters the flow channel of the mechanical valve MV and then enters the second shuttle valve S2 (equivalent to adding a spherical piston to the three-way valve. If the pressure on one side is high, the piston is pushed to move to the other side. The piston makes the pipeline with high pressure conduct to the output), and finally realizes the passage of the system (see Figure 2 , the thin solid line indicates the part of the pipeline that is open, and the dotted line indicates the part of the pipeline that is blocked). Close B3, and the solenoid valve V3 can be replaced online. After the replacement is completed, it can be pressed Figure 1 Work.

[0028] 2. Figure 3 As shown, the gas circuit description is: when the input end (INLET) is ventilated, the thick solid circuit generates air pressure. When SOLENOIDVALVE1 and SOLENOID VALVE3 can be ventilated normally, and SOLENOID VALVE2 is abnormal, the medium circulated by the solenoid valve V1 opens the valve and enters the sealing chamber of the mechanical valve MV, thereby opening the flow channel of the mechanical valve MV. At the same time, the medium circulated by the solenoid valve V1 also passes through an inlet of the first reversing shuttle valve S1, and then enters the inlet of the solenoid valve V3 from the outlet of the first reversing shuttle valve S1. At this time, the solenoid valve V3 is energized and open, and the medium entering from the outlet of the first reversing shuttle valve S1 can enter the second reversing shuttle valve S2 through the solenoid valve V3, and finally realize the passage of the system (see Figure 3 , the thin solid line indicates the part of the pipeline that is open, and the dotted line indicates the part of the pipeline that is blocked). Close B2, and the solenoid valve V2 can be replaced online.

[0029] 3. Figure 4As shown, the gas circuit description: when the input end (INLET) is ventilated, the thick solid circuit generates air pressure. When SOLENOIDVALVE2 and SOLENOID VALVE3 can be ventilated normally, and SOLENOID VALVE1 is abnormal, the medium circulated by the solenoid valve V2 opens and enters an inlet of the first reversing shuttle valve S1 and the first inlet of the mechanical valve MV. However, because the solenoid valve V1 is abnormal, the circulating medium does not enter the piston chamber of the mechanical valve MV, and it is impossible to promote the flow channel switching of the mechanical valve MV. At this time, although the circulating medium at the outlet of the second solenoid valve V2 also flows to the second inlet of the mechanical valve MV synchronously, because the flow channel of the mechanical valve MV is not switched, there is no circulating medium at the second outlet of the mechanical valve MV. After the medium circulated by the solenoid valve V2 opens and enters an inlet of the first reversing shuttle valve S1, it will continue to enter the inlet of the solenoid valve V3 from the outlet of the first reversing shuttle valve S1. At this time, the solenoid valve V3 is in the power-on open state, and the medium entering from the outlet of the first reversing shuttle valve S1 can enter the second reversing shuttle valve S2 through the solenoid valve V3. Finally, the system path is realized (see Figure 4 , the thin solid line indicates the part of the pipeline that is open, and the dotted line indicates the part of the pipeline that is blocked). Close B1, and the solenoid valve V1 can be replaced online.

[0030] 4. In addition to the above introduction, the pilot solenoid valve 2OO3 redundant system that can be maintained online has other on-off conditions, as shown in Table 1.

[0031]

[0032] The above-mentioned embodiments only express the implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the attached claims.

Claims

1. Redundant pilot solenoid valve that can be maintained online, characterized by: It includes three pilot solenoid valves, a mechanical valve and a reversing shuttle valve; the inlet pipes of the three pilot solenoid valves are connected in series with a stop valve, the first and second pilot solenoid valves are connected in parallel, the outlets of the first and second pilot solenoid valves are connected to the first and second ports of the reversing shuttle valve through an air path, the third port of the reversing shuttle valve is connected to the inlet of the third pilot solenoid valve, and a check valve is connected in series with the first pilot solenoid valve; the mechanical valve is a valve with two inlets and two outlets, the first outlet of the first pilot solenoid valve is connected to the first inlet of the mechanical valve, the first outlet of the second pilot solenoid valve is connected to the second inlet of the mechanical valve, the second inlet of the mechanical valve has a flow channel connected to the first outlet of the mechanical valve and connected to the second inlet of the second reversing shuttle valve; the second outlets of the first and second pilot solenoid valves are interconnected and connected to a muffler; the second outlet of the mechanical valve is connected to the second outlet of the third pilot solenoid valve and connected to the muffler; the first outlet of the third pilot solenoid valve is connected to the first inlet of the second reversing shuttle valve.

2. The redundant pilot-operated solenoid valve capable of online maintenance according to claim 1 is characterized in that: The stop valve in series is a ball valve.

3. The redundant pilot-operated solenoid valve capable of online maintenance according to claim 1 is characterized in that: A second shuttle valve is provided, the first and second ports of the second shuttle valve are respectively connected to the outlet of the third pilot solenoid valve and the outlet of the mechanical valve, and the third port of the second shuttle valve is the outlet of the gas circuit.

Images