Double-valve redundancy hydraulic control system for switching control elements on line in unit operation

Abstract

The utility model discloses a double-valve redundancy hydraulic control system for switching control elements on line in unit operation, which relates to the technical field of hydraulic control and comprises a first reversing valve, a second reversing valve, a third reversing valve, a first hydraulic control one-way valve and a second hydraulic control one-way valve. The first reversing valve is respectively connected with the pump source, the oil return tank and two oil cavities of the execution element through four first hydraulic control one-way valves; the second reversing valve is communicated with the pump source and the oil return tank, and is respectively communicated with two oil cavities of the execution element through two second hydraulic control one-way valves; and the third reversing valve is communicated with the pump source, the oil return tank, all the first hydraulic control one-way valves and all the second hydraulic control one-way valves. All the first hydraulic control one-way valves and all the second hydraulic control one-way valves can be controlled at the same time through the pump source, so that the first reversing valves and the second reversing valves are switched for use, the structure is simple, operation is easy and convenient, and switching emergency and rapidity can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic control, and more specifically, to a double-valve redundant hydraulic control system for online switching control elements during the operation of a unit. Background Art

[0002] In thermal power generating units, regulating actuators are widely used in valve equipment of steam pipelines to control the opening of steam valves. They are usually driven by hydraulic pressure and form a closed-loop control through displacement feedback. Since only one regulating valve is usually set on a single pipeline, the stability of the regulating actuator is very important for the flow control of the entire pipeline.

[0003] Chinese patent CN219262816U provides an electro-hydraulic servo protection device, which includes a first hydraulically controlled one-way valve group, a second hydraulically controlled one-way valve group, a first reversing valve, a second reversing valve, a first throttle valve, a third hydraulically controlled one-way valve and an electro-hydraulic servo valve, wherein the oil outlet of the electro-hydraulic servo valve is connected to the oil inlet of the first hydraulically controlled one-way valve group; the oil outlet of the first hydraulically controlled one-way valve group is connected to the oil inlet of the actuator; the oil outlet of the first reversing valve is connected to the oil inlet of the second hydraulically controlled one-way valve group, and the oil outlet of the second hydraulically controlled one-way valve group is connected to the oil inlet of the actuator; the second reversing valve has a first working state and a second working state; the oil outlet of the third hydraulically controlled one-way valve is connected to the oil outlet of the electro-hydraulic servo valve The oil inlet of the third hydraulically controlled one-way valve is connected to the oil outlet of the pump source; in the first working state, the oil outlet of the pump source is connected to the control oil port of the first hydraulically controlled one-way valve group through the second reversing valve, and the oil inlet of the return oil tank is connected to the control oil port of the second hydraulically controlled one-way valve group through the second reversing valve; the control oil port of the third hydraulically controlled one-way valve is connected to the oil outlet of the pump source through the second reversing valve; in the second working state, the oil outlet of the pump source is connected to the control oil port of the second hydraulically controlled one-way valve group through the second reversing valve, and the oil inlet of the return oil tank is connected to the control oil port of the first hydraulically controlled one-way valve group through the second reversing valve; the control oil port of the third hydraulically controlled one-way valve is connected to the oil inlet of the return oil tank through the second reversing valve. The first throttle valve is arranged between the oil return port of the electro-hydraulic servo valve and the return oil tank.

[0004] In the above device, the electro-hydraulic servo valve is a common valve, the first reversing valve is a spare valve, and the three hydraulically controlled one-way valves and one throttle valve connected to the common valve, when replacing the electro-hydraulic servo valve, the three hydraulically controlled one-way valves must be closed first, and then the throttle valve. The throttle valve and the hydraulically controlled one-way valve have different structures, and the control methods are also different. They cannot share the same control structure, which will increase the complexity of the entire device and the complexity of operation. Utility Model Content

[0005] In view of the problem that the types of valves connected to the commonly used valves in the regulating actuators in the prior art are not uniform, and the same control structure cannot be shared, and the operation of replacing the commonly used valves in the regulating actuators is complicated, the purpose of the utility model is to provide a dual-valve redundant hydraulic control system for online switching of control elements during the operation of the unit, which is used in conjunction with the pump source, the return oil tank, the oil chamber A and the oil chamber B of the actuator, and includes a first reversing valve, a second reversing valve, a third reversing valve, a first hydraulically controlled check valve, and a second hydraulically controlled check valve. The first reversing valve, the second reversing valve, and the third reversing valve are any one of a pneumatically controlled reversing valve, a hydraulically controlled reversing valve, and an electrically controlled reversing valve.

[0006] The first reversing valve is connected to four first hydraulically controlled one-way valves, and the four first hydraulically controlled one-way valves are respectively connected to the pump source, the oil return tank, the oil chamber A and the oil chamber B. The first reversing valve has a first working state and a second working state. In the first working state, the pump source is connected to the oil chamber A through the first reversing valve, and the oil return tank is connected to the oil chamber B through the first reversing valve. In the second working state, the oil return tank is connected to the oil chamber A through the first reversing valve, and the pump source is connected to the oil chamber B through the first reversing valve.

[0007] The second reversing valve has four valve ports, two of which are connected to the pump source and the oil return tank, respectively, and the remaining two valve ports are connected to the oil chamber A and the oil chamber B, respectively, through two second hydraulically controlled one-way valves. The second reversing valve has a third working state and a fourth working state. In the third working state, the pump source is connected to the oil chamber A through the second reversing valve, and the oil return tank is connected to the oil chamber B through the second reversing valve. In the fourth working state, the oil return tank is connected to the oil chamber A through the second reversing valve, and the pump source is connected to the oil chamber B through the second reversing valve.

[0008] The third reversing valve has a first valve port, a second valve port, a third valve port and a fourth valve port. The first valve port is connected to the pump source, the second valve port is connected to the oil return tank, the third valve port is connected to all first hydraulically controlled one-way valves, and the fourth valve port is connected to all second hydraulically controlled one-way valves. The third reversing valve has a fifth working state and a sixth working state. In the fifth working state, the first valve port is connected to the third valve port, all first hydraulically controlled one-way valves are bidirectionally connected, the second valve port is connected to the fourth valve port, and all second hydraulically controlled one-way valves only allow liquid to flow from the second reversing valve to the actuator. In the sixth working state, the first valve port is connected to the fourth valve port, all second hydraulically controlled one-way valves are bidirectionally connected, the second valve port is connected to the third valve port, and all first hydraulically controlled one-way valves only allow liquid to flow from the first reversing valve to the actuator or the pump source or the oil return tank.

[0009] The utility model is further configured to include: a first valve, and the second reversing valve is connected to the pump source through the first valve.

[0010] The utility model is further configured as follows: the first valve is a hydraulically controlled one-way valve, the first valve is connected to the fourth valve port. When the third reversing valve is in the fifth working state, the first valve only allows liquid to flow from the second reversing valve to the pump source. When the third reversing valve is in the sixth working state, the first valve is bidirectionally conductive.

[0011] The utility model is further configured to include: a second valve, and the second reversing valve is communicated with the oil return tank via the second valve.

[0012] The utility model is further configured as follows: the second valve is a hydraulically controlled one-way valve, the second valve is connected to the fourth valve port. When the third reversing valve is in the fifth working state, the second valve only allows liquid to flow from the second reversing valve to the oil tank. When the third reversing valve is in the sixth working state, the second valve is bidirectionally conductive.

[0013] The utility model is further configured to include a third valve, through which the pump source is connected to the third reversing valve, the second reversing valve and the first hydraulically controlled one-way valve corresponding to the pump source.

[0014] The utility model is further configured to include a fourth valve, through which the oil return tank is connected to the third reversing valve, the second reversing valve and the first hydraulically controlled one-way valve corresponding to the oil return tank.

[0015] The utility model is further configured as follows: the third valve and the fourth valve are both stop valves.

[0016] The utility model is further configured as follows: the first reversing valve and the second reversing valve are both three-position four-way reversing valves.

[0017] The utility model is further configured as follows: the first reversing valve, the second reversing valve and the third reversing valve are all electrically controlled reversing valves.

[0018] In summary, compared with the prior art, the utility model has the following beneficial effects: the utility model can simultaneously control all first hydraulically controlled one-way valves and all second hydraulically controlled one-way valves through a pump source, thereby switching the first reversing valve and the second reversing valve, and has a simple structure and is easy to operate. On this basis, the structure of the branch where the first reversing valve and the branch where the second reversing valve are located in the utility model are exactly the same, and both realize the opening and closing of the branch through the hydraulically controlled one-way valve, and cooperate with the electric control of the first reversing valve, the second reversing valve, and the third reversing valve, so as to realize full-automatic switching, and ensure the urgency and rapidity of the switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the embodiment.

[0020] In the figure: 1. first reversing valve; 2. second reversing valve; 3. third reversing valve; 4. first hydraulically controlled non-return valve; 5. second hydraulically controlled non-return valve; 6. first valve; 7. second valve; 8. third valve; 9. fourth valve; 10. pump source; 11. oil return tank; 12. oil chamber A; 13. oil chamber B. DETAILED DESCRIPTION

[0021] The technical solution of the utility model will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] It should be noted that the terms "center", "up", "down", "horizontal", "left", "right", "front", "back", "lateral", "longitudinal", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0023] Example

[0024] like Figure 1 As shown, it is the basic structure of the preferred embodiment of the utility model. This embodiment provides a dual-valve redundant hydraulic control system for online switching of control elements during the operation of the unit, which is used in conjunction with a pump source 10, a return oil tank 11, and an oil chamber A12 and an oil chamber B13 of an actuator, and includes a first reversing valve 1, a second reversing valve 2, a third reversing valve 3, a first hydraulically controlled check valve 4, and a second hydraulically controlled check valve 5. The first reversing valve 1, the second reversing valve 2, and the third reversing valve 3 are any one of a pneumatically controlled reversing valve, a hydraulically controlled reversing valve, and an electrically controlled reversing valve.

[0025] The first reversing valve 1 is connected to four first hydraulically controlled one-way valves 4, and the four first hydraulically controlled one-way valves 4 are respectively connected to the pump source 10, the oil return tank 11, the oil chamber A12 and the oil chamber B13. The first reversing valve 1 has a first working state and a second working state. In the first working state, the pump source 10 is connected to the oil chamber A12 through the first reversing valve 1, and the oil return tank 11 is connected to the oil chamber B13 through the first reversing valve 1. In the second working state, the oil return tank 11 is connected to the oil chamber A12 through the first reversing valve 1, and the pump source 10 is connected to the oil chamber B13 through the first reversing valve 1.

[0026] The second reversing valve 2 has four valve ports, two of which are connected to the pump source 10 and the oil return tank 11 respectively, and the remaining two valve ports are connected to the oil chamber A12 and the oil chamber B13 respectively through two second hydraulically controlled one-way valves 5. The second reversing valve 2 has a third working state and a fourth working state. In the third working state, the pump source 10 is connected to the oil chamber A12 through the second reversing valve 2, and the oil return tank 11 is connected to the oil chamber B13 through the second reversing valve 2. In the fourth working state, the oil return tank 11 is connected to the oil chamber A12 through the second reversing valve 2, and the pump source 10 is connected to the oil chamber B13 through the second reversing valve 2.

[0027] The third reversing valve 3 has a first valve port, a second valve port, a third valve port and a fourth valve port. The first valve port is connected to the pump source 10, the second valve port is connected to the oil return tank 11, the third valve port is connected to all the first hydraulically controlled one-way valves 4, and the fourth valve port is connected to all the second hydraulically controlled one-way valves 5. The third reversing valve 3 has a fifth working state and a sixth working state. In the fifth working state, the first valve port is connected to the third valve port, all the first hydraulically controlled one-way valves 4 are bidirectionally connected, the second valve port is connected to the fourth valve port, and all the second hydraulically controlled one-way valves 5 only allow the liquid to flow from the second reversing valve 2 to the actuator. In the sixth working state, the first valve port is connected to the fourth valve port, all the second hydraulically controlled one-way valves 5 are bidirectionally connected, the second valve port is connected to the third valve port, and all the first hydraulically controlled one-way valves 4 only allow the liquid to flow from the first reversing valve 1 to the actuator or the pump source 10 or the oil return tank 11.

[0028] In this embodiment, all the first hydraulically controlled one-way valves 4 and all the second hydraulically controlled one-way valves 5 can be controlled simultaneously by the pump source 10, so as to switch the first reversing valve 1 and the second reversing valve 2, and the structure is simple and the operation is easy. In this embodiment, when all the first hydraulically controlled one-way valves 4 are in a two-way conducting state, the first reversing valve 1 is in a working state, all the second hydraulically controlled one-way valves 5 are in a one-way conducting state, and the second reversing valve 2 is in a standby state. When all the first hydraulically controlled one-way valves 4 are in a one-way conducting state, no liquid flows to the first reversing valve 1, and the first reversing valve 1 can be disassembled, assembled and replaced at this time, and all the second hydraulically controlled one-way valves 5 are in a two-way conducting state, and the second reversing valve 2 is in a working state.

[0029] This embodiment further includes a first valve 6, and the second reversing valve 2 is connected to the pump source 10 through the first valve 6. The first valve 6 is used to control the on-off of the liquid channel between the first valve 6 and the pump source 10. When the second reversing valve 2 is in a standby state, after the first valve 6 is closed, no liquid flows to the second reversing valve 2, and the second reversing valve 2 can be disassembled, assembled, or replaced.

[0030] Specifically, the first valve 6 is a hydraulically controlled one-way valve, and the first valve 6 is connected to the fourth valve port. When the third reversing valve 3 is in the fifth working state, the first valve 6 only allows the liquid to flow from the second reversing valve 2 to the pump source 10. When the third reversing valve 3 is in the sixth working state, the first valve 6 is bidirectionally connected. In other words, the first valve 6 and all the second hydraulically controlled one-way valves 5 are synchronously controlled through the same structure, which simplifies the valve control steps when the second reversing valve 2 is disassembled and replaced.

[0031] The present embodiment further includes a second valve 7, through which the second reversing valve 2 is connected to the oil return tank 11, and the second valve 7 is used to control the on-off of the liquid passage between the second valve 7 and the oil return tank 11. When the second reversing valve 2 is in a standby state, after the first valve 6 and the second valve 7 are closed, no liquid flows to the second reversing valve 2, and at this time, disassembling and replacing the second reversing valve 2 can reduce liquid leakage in the liquid passage where the second valve 7 is located.

[0032] Specifically, the second valve 7 is a hydraulically controlled one-way valve, and the second valve 7 is connected to the fourth valve port. When the third reversing valve 3 is in the fifth working state, the second valve 7 only allows the liquid to flow from the second reversing valve 2 to the oil return tank 11. When the third reversing valve 3 is in the sixth working state, the second valve 7 is bidirectionally connected. The first valve 6, the second valve 7 and all the second hydraulically controlled one-way valves 5 are synchronously controlled through the same structure, which simplifies the valve control steps when the second reversing valve 2 is disassembled and replaced.

[0033] This embodiment further includes a third valve 8, through which the pump source 10 is connected to the third reversing valve 3, the second reversing valve 2 and the first hydraulically controlled one-way valve 4 corresponding to the pump source 10. The third valve 8 is used to control the on-off of the fluid passage between the pump source 10 and the third reversing valve 3, the second reversing valve 2 and the first hydraulically controlled one-way valve 4 corresponding to the pump source 10. Closing the third valve 8 and then disassembling and assembling the dual-valve redundant hydraulic control system of the online switching control element during the operation of the unit and the pump source 10 can effectively reduce the liquid leakage at the connection between the pump source 10 and the dual-valve redundant hydraulic control system of the online switching control element during the operation of the unit.

[0034] This embodiment further includes a fourth valve 9, through which the return oil tank 11 is connected to the third reversing valve 3, the second reversing valve 2 and the first hydraulically controlled one-way valve 4 corresponding to the return oil tank 11. The fourth valve 9 is used to control the on-off of the fluid passage between the return oil tank 11 and the third reversing valve 3, the second reversing valve 2 and the first hydraulically controlled one-way valve 4 corresponding to the return oil tank 11. Closing the fourth valve 9 and then disassembling and assembling the dual-valve redundant hydraulic control system of the online switching control element during the operation of the unit and the return oil tank 11 can effectively reduce the liquid leakage at the connection between the return oil tank 11 and the dual-valve redundant hydraulic control system of the online switching control element during the operation of the unit.

[0035] In this embodiment, the third valve 8 and the fourth valve 9 are both stop valves, so as to quickly cut off the flow of liquid and further reduce liquid leakage.

[0036] Specifically, in this embodiment, the first reversing valve 1 and the second reversing valve 2 are both three-position four-way reversing valves. The third reversing valve 3 is a two-position four-way reversing valve.

[0037] Specifically, in this embodiment, the first reversing valve 1, the second reversing valve 2, and the third reversing valve 3 are all electrically controlled reversing valves. In this embodiment, the first reversing valve 1, the second reversing valve 2 are all electro-hydraulic servo valves, and the third reversing valve 3 is an electromagnetic reversing valve.

[0038] In summary, the present embodiment can simultaneously control all first hydraulically controlled one-way valves 4 and all second hydraulically controlled one-way valves 5 through the pump source 10, thereby switching the first reversing valve 1 and the second reversing valve 2, with a simple structure and easy operation. On this basis, the branch where the first reversing valve 1 and the branch where the second reversing valve 2 are located in the present embodiment are completely identical in structure, and both realize the opening and closing of the branch through the hydraulically controlled one-way valve, and cooperate with the electric control of the first reversing valve 1, the second reversing valve 2, and the third reversing valve 3, to realize full-automatic switching, and ensure the urgency and rapidity of the switching.

[0039] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A dual-valve redundant hydraulic control system for online switching of control elements during unit operation, used in conjunction with a pump source (10), a return oil tank (11), an oil chamber A (12) and an oil chamber B (13) of an actuator, is characterized by: The invention comprises a first reversing valve (1), a second reversing valve (2), a third reversing valve (3), a first hydraulically controlled one-way valve (4), and a second hydraulically controlled one-way valve (5); the first reversing valve (1), the second reversing valve (2), and the third reversing valve (3) are any one of a pneumatically controlled reversing valve, a hydraulically controlled reversing valve, and an electrically controlled reversing valve; The first reversing valve (1) is connected to four first hydraulically controlled one-way valves (4), and the four first hydraulically controlled one-way valves (4) are respectively connected to the pump source (10), the oil return tank (11), the oil chamber A (12) and the oil chamber B (13); the first reversing valve (1) has a first working state and a second working state. In the first working state, the pump source (10) is connected to the oil chamber A (12) through the first reversing valve (1), and the oil return tank (11) is connected to the oil chamber B (13) through the first reversing valve (1); in the second working state, the oil return tank (11) is connected to the oil chamber A (12) through the first reversing valve (1), and the pump source (10) is connected to the oil chamber B (13) through the first reversing valve (1); The second reversing valve (2) has four valve ports, two of which are respectively connected to the pump source (10) and the oil return tank (11), and the remaining two valve ports are respectively connected to the oil chamber A (12) and the oil chamber B (13) through two second hydraulically controlled one-way valves (5); the second reversing valve (2) has a third working state and a fourth working state. In the third working state, the pump source (10) is connected to the oil chamber A (12) through the second reversing valve (2), and the oil return tank (11) is connected to the oil chamber B (13) through the second reversing valve (2); in the fourth working state, the oil return tank (11) is connected to the oil chamber A (12) through the second reversing valve (2), and the pump source (10) is connected to the oil chamber B (13) through the second reversing valve (2); The third reversing valve (3) has a first valve port, a second valve port, a third valve port and a fourth valve port. The first valve port is connected to the pump source (10), the second valve port is connected to the oil return tank (11), the third valve port is connected to all the first hydraulically controlled one-way valves (4), and the fourth valve port is connected to all the second hydraulically controlled one-way valves (5). The third reversing valve (3) has a fifth working state and a sixth working state. In the fifth working state, the first valve port is connected to the third valve port, all the first hydraulically controlled one-way valves (4) are bidirectionally connected, the second valve port is connected to the fourth valve port, and all the second hydraulically controlled one-way valves (5) only allow liquid to flow from the second reversing valve (2) to the actuator. In the sixth working state, the first valve port is connected to the fourth valve port, all the second hydraulically controlled one-way valves (5) are bidirectionally connected, the second valve port is connected to the third valve port, and all the first hydraulically controlled one-way valves (4) only allow liquid to flow from the first reversing valve (1) to the actuator or the pump source (10) or the oil return tank (11).

2. The dual-valve redundant hydraulic control system for online switching of control elements during unit operation according to claim 1, characterized in that: It also includes a first valve (6), and the second reversing valve (2) is connected to the pump source (10) through the first valve (6).

3. The dual-valve redundant hydraulic control system for online switching of control elements during unit operation according to claim 2, characterized in that: The first valve (6) is a hydraulically controlled one-way valve, and the first valve (6) is connected to the fourth valve port; when the third reversing valve (3) is in the fifth working state, the first valve (6) only allows liquid to flow from the second reversing valve (2) to the pump source (10); when the third reversing valve (3) is in the sixth working state, the first valve (6) is bidirectionally conductive.

4. The dual-valve redundant hydraulic control system for online switching of control elements during unit operation according to claim 2, characterized in that: It also includes a second valve (7), and the second reversing valve (2) is connected to the oil return tank (11) through the second valve (7).

5. The dual-valve redundant hydraulic control system for online switching of control elements during unit operation according to claim 4, characterized in that: The second valve (7) is a hydraulically controlled one-way valve, and the second valve (7) is connected to the fourth valve port; when the third reversing valve (3) is in the fifth working state, the second valve (7) only allows liquid to flow from the second reversing valve (2) to the oil return tank (11); when the third reversing valve (3) is in the sixth working state, the second valve (7) is bidirectionally conductive.

6. A dual-valve redundant hydraulic control system for online switching of control elements during unit operation according to any one of claims 1 to 5, characterized in that: It also includes a third valve (8), and the pump source (10) is connected to the third reversing valve (3), the second reversing valve (2) and the first hydraulically controlled one-way valve (4) corresponding to the pump source (10) through the third valve (8).

7. The dual-valve redundant hydraulic control system for online switching of control elements during unit operation according to claim 6, characterized in that: It also includes a fourth valve (9), and the oil return tank (11) is connected to the third reversing valve (3), the second reversing valve (2) and the first hydraulically controlled one-way valve (4) corresponding to the oil return tank (11) through the fourth valve (9).

8. The dual-valve redundant hydraulic control system for online switching of control elements during unit operation according to claim 7, characterized in that: The third valve (8) and the fourth valve (9) are both stop valves.

9. The dual-valve redundant hydraulic control system for online switching of control elements during unit operation according to any one of claims 1 to 5, characterized in that: The first reversing valve (1) and the second reversing valve (2) are both three-position four-way reversing valves.

10. The dual-valve redundant hydraulic control system for online switching of control elements during unit operation according to any one of claims 1 to 5, characterized in that: The first reversing valve (1), the second reversing valve (2) and the third reversing valve (3) are all electrically controlled reversing valves.

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