Hydraulic control device with voting function

Abstract

The utility model belongs to the technical field of hydraulic control, and particularly discloses a hydraulic control device with a voting function. According to the hydraulic control loop, the multi-way electric control valves and the hydraulic control valve set are subjected to associated control, and in the emergency state, as long as any more than half of the electric control valves drive the hydraulic control valve set to act, the purpose of normal control of the hydraulic control loop can be achieved; the condition that the X end is accidentally converted into the high-pressure state or cannot be converted into the high-pressure state due to the fact that one electric control valve of a hydraulic circuit controlled by one electric control valve or a hydraulic control circuit used by connecting two electric control valve oil ways in series fails in the prior art is avoided, and therefore safe and reliable operation of a production device is guaranteed.

Description

Technical Field

[0001] This application belongs to the technical field of hydraulic control, and more specifically, relates to a hydraulic control device with a voting function. Background Art

[0002] The hydraulic control system is based on a motor to provide power. A hydraulic pump is used to extract hydraulic oil to convert mechanical energy into kinetic energy, i.e., pressure. By controlling various hydraulic components to change the flow direction and oil pressure of the hydraulic oil, various devices can be driven, and it is widely used in electromechanical fields such as petrochemical industry, shipbuilding, and electric power.

[0003] Currently, most hydraulic control systems adopt a hydraulic control circuit controlled by a single electric control valve or a hydraulic control circuit in which two electric control valve oil circuits are connected in series in the ESD interlock control state. In an emergency state, the X end (control end) should change from a low-pressure state to a high-pressure state under the action of the hydraulic control circuit.

[0004] However, once a certain electric control valve fails, it will cause problems that the hydraulic control circuit of this path cannot be normally controlled, including but not limited to: 1) The single solenoid valve accidentally loses power, causing the magnetic core to reset, so that the X end changes from a low-pressure state to a high-pressure state in a non-ESD interlock control state; 2) The magnetic core spool of the single solenoid valve is stuck, resulting in the inability to achieve a high-pressure state when the ESD interlock control state is required; 3) The spool of one solenoid valve in the series-connected electric control valves is stuck, resulting in the inability to achieve a high-pressure state when the ESD interlock control state is required. These problems pose potential safety hazards to the safe production of the entire device (such as the catalytic device in a refinery). Summary of the Utility Model

[0005] Aiming at the defects of the prior art, the purpose of this application is to provide a hydraulic control device with a voting function, aiming to solve the problem that a certain electric control valve fails in the existing hydraulic control technology, resulting in the abnormal operation of the hydraulic control system.

[0006] To achieve the above purpose, this application provides a hydraulic control device with a voting function, including: a plurality of hydraulic control circuits, which are connected to the solenoid valves and hydraulic control valve groups in different hydraulic control circuits in an associated form, so that in an emergency state, the solenoid valves in more than half of the hydraulic control circuits drive the hydraulic control valve groups to act.

[0007] Preferably, the solenoid valve is a two-way three-way solenoid valve, and the hydraulic control valve group includes a two-way three-way hydraulic control reversing valve, a check valve, and a hydraulic control check valve.

[0008] Preferably, the two-way three-way solenoid valve is in a powered state under normal working conditions.

[0009] Preferably, port 1 of the two-position three-way solenoid valve is connected to port O, port 2 is connected to port 1 of the two-position three-way hydraulic control reversing valve in the same hydraulic control circuit, port 1 of the one-way valve in another hydraulic control circuit, and port 3 of the hydraulic control check valve, and port 3 is connected to port P;

[0010] Port 1 of the two-position three-way hydraulic control reversing valve is connected to port 2 of the two-position three-way solenoid valve in the same hydraulic control circuit, port 2 is connected to port 1 of the hydraulic control check valve in the same hydraulic control circuit, port 3 is connected to terminal X, and port 4 is connected to port 2 of the one-way valve in the same hydraulic control circuit;

[0011] Port 1 of the hydraulic control check valve is connected to port 2 of the two-position three-way hydraulic control reversing valve in the same hydraulic control circuit, and port 2 is connected to port O;

[0012] Port 1 of the one-way valve and port 3 of the hydraulic control check valve are connected to port 2 of the two-position three-way solenoid valve in the same hydraulic control circuit.

[0013] Preferably, when the coil of the solenoid valve in a certain hydraulic control circuit loses power, port 2 of the one-way valve in this hydraulic control circuit is in a low-pressure state, and high-pressure oil cannot reach terminal X; port 2 of the two-position three-way solenoid valve is connected to the pilot pressure ports of the one-way valve and the hydraulic control check valve in the adjacent hydraulic control circuit, both of which are in a high-pressure state, but port 1 of the two-position three-way hydraulic control reversing valve in this hydraulic control circuit is in a low-pressure state, the 2nd and 3rd ports of this two-position three-way hydraulic control reversing valve are in a disconnected state, and high-pressure oil cannot reach terminal X at port 3 through port 2, and terminal X is in a low-pressure state.

[0014] Preferably, when the coils of the solenoid valves in more than half of the hydraulic control circuits lose power, in each power-off hydraulic control circuit, the high-pressure oil pushes the spool of the two-position three-way hydraulic control reversing valve, disconnecting the oil path of the hydraulic control check valve in the adjacent hydraulic control circuit from terminal X, and at the same time, conducting the oil path of the one-way valve in the adjacent hydraulic control circuit to terminal X, so that high-pressure oil reaches terminal X, and terminal X is in a high-pressure state.

[0015] Preferably, the terminal X is a control terminal for connecting the hydraulic control valve of the main oil path; the port P is a high-pressure port for connecting the main control oil port, and the port O is a low-pressure port for connecting the return oil tank.

[0016] Preferably, the state of the solenoid valve (conducted or closed) is monitored by a pressure gauge or a pressure transmitter.

[0017] Generally speaking, compared with the prior art, the above technical solution conceived by the present application has the following beneficial effects:

[0018] The present application provides a hydraulic control device with a voting function, which is associated and controlled through a multi-way electric control valve and a hydraulic control valve group. In an emergency state, as long as any more than half of the electric control valves drive the hydraulic control valve group to act, the normal control of the hydraulic control circuit can be achieved, avoiding the situation that the hydraulic control circuit controlled by one electric control valve or the hydraulic control circuit in which two electric control valve oil circuits are connected in series in the past, due to a fault in one of the electric control valves, the X end accidentally changes to the high-pressure state or cannot change to the high-pressure state, thus ensuring the safe and reliable operation of the production device. Brief Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the hydraulic control device with a voting function provided by an embodiment of the present application. Detailed Embodiment

[0020] For easy understanding, first, the English abbreviations and related technical terms involved in the embodiments of the present application will be explained and described below.

[0021] ESD interlock: The full name is Emergency Shutdown Device, that is, the emergency shutdown system, which is a dedicated safety protection system.

[0022] The embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

[0023] The present application provides a hydraulic control device with a voting function, including: a plurality of hydraulic control circuits, which are connected to the solenoid valves and hydraulic control valve groups in different hydraulic control circuits in an associated manner, so that in an emergency state, the solenoid valves in more than half of the hydraulic control circuits drive the hydraulic control valve group to act.

[0024] Preferably, the solenoid valve is a two-position three-way solenoid valve, and the hydraulic control valve group includes a two-position three-way hydraulic control reversing valve, a check valve and a hydraulic control check valve.

[0025] Preferably, the two-position three-way solenoid valve is in the energized state under normal working conditions.

[0026] Preferably, port 1 of the two-position three-way solenoid valve is connected to port O, port 2 is connected to port 1 of the two-position three-way hydraulic control reversing valve in the same hydraulic control circuit, port 1 of the check valve in another hydraulic control circuit and port 3 of the hydraulic control check valve, and port 3 is connected to port P;

[0027] Port 1 of the two-position three-way hydraulic control reversing valve is connected to port 2 of the two-position three-way solenoid valve in the same hydraulic control circuit, port 2 is connected to port 1 of the hydraulic control check valve in the same hydraulic control circuit, port 3 is connected to the X end, and port 4 is connected to port 2 of the check valve in the same hydraulic control circuit;

[0028] Port 1 of the pilot-operated check valve is connected to port 2 of a two-position three-way pilot-operated directional control valve in the same hydraulic control circuit, and port 2 is connected to port O;

[0029] Port 1 of the check valve and port 3 of the pilot-operated check valve are connected to port 2 of a two-position three-way solenoid valve in an adjacent hydraulic control circuit.

[0030] Preferably, when the coil of the solenoid valve in a certain hydraulic control circuit loses power, port 2 of the check valve in this hydraulic control circuit is in a low-pressure state, and high-pressure oil cannot reach end X; port 2 of the two-position three-way solenoid valve is connected to the pilot pressure ports of the check valve and the pilot-operated check valve in an adjacent hydraulic control circuit, which are both in a high-pressure state, but port 1 of the two-position three-way pilot-operated directional control valve in this hydraulic control circuit is in a low-pressure state, the 2nd and 3rd ports of this two-position three-way pilot-operated directional control valve are in a disconnected state, and high-pressure oil cannot reach end X at port 3 through port 2, and end X is in a low-pressure state.

[0031] Preferably, when the coils of the solenoid valves in more than half of the hydraulic control circuits lose power, in each power-off hydraulic control circuit, high-pressure oil pushes the spool of the two-position three-way pilot-operated directional control valve, disconnecting the oil path of the pilot-operated check valve in the adjacent hydraulic control circuit from end X. At the same time, the pilot pressure port of the pilot-operated check valve in the adjacent hydraulic control circuit is at a high pressure, causing the oil path of this pilot-operated check valve to close, disconnecting the oil path between the pilot-operated check valve and the return oil. High-pressure oil reaches end X through the check valve and the two-position three-way pilot-operated directional control valve, and end X is in a high-pressure state.

[0032] Preferably, end X is a control end for connecting a pilot-operated valve of the main oil path; port P is a high-pressure port for connecting the main control oil port, and port O is a low-pressure port for connecting to the oil return tank.

[0033] Preferably, a pressure gauge or a pressure transmitter is used to monitor whether the solenoid valve is in a conducting or closed state.

[0034] Preferably, the number of hydraulic control circuits is greater than or equal to 3.

[0035] Embodiment

[0036] As Figure 1 shown, a hydraulic control device with a voting function provided in this embodiment includes: three hydraulic control circuits. The first hydraulic control circuit consists of a two-position three-way solenoid valve YV1, a two-position three-way pilot-operated directional control valve C1, a check valve C2, and a pilot-operated check valve C3. The second hydraulic control circuit consists of a two-position three-way solenoid valve YV2, a two-position three-way pilot-operated directional control valve C4, a check valve C5, and a pilot-operated check valve C6. The third hydraulic control circuit consists of a two-position three-way solenoid valve YV3, a two-position three-way pilot-operated directional control valve C7, a check valve C8, and a pilot-operated check valve C9.

[0037] The connection relationships of each interface in the two-position three-way solenoid valves YV1, YV2, and YV3 are shown in Table 1:

[0038]

[0039] Table 1

[0040] The connection relationships of each interface in the two-position three-way hydraulic control valves C1, C4, and C7 are shown in Table 2 as follows:

[0041]

[0042] Table 2

[0043] The connection relationships of each interface in the one-way valves C2, C5, and C8 are shown in Table 3 as follows:

[0044] One-way valve Port 1 (inlet) Port 2 (outlet) C2 Port 2 of YV3 Port 4 of C1 C5 Port 2 of YV1 Port 4 of C4 C8 Port 2 of YV2 Port 4 of C7

[0045] Table 3

[0046] The connection relationships of each interface in the hydraulic control one-way valves C3, C6, and C9 are shown in Table 4 as follows:

[0047] Hydraulic control one-way valve Port 1 (inlet) Port 2 (outlet) Port 3 (control oil port) C3 Port 2 of C1 Port O Port 2 of YV3 C6 Port 2 of C4 Port O Port 2 of YV1 C9 Port 2 of C7 Port O Port 2 of YV2

[0048] Table 4

[0049] The three-way electric control valves YV1, YV2, and YV3 (also known as solenoid valves) are in the state where the electromagnetic coils are energized under normal working conditions. Under the energized state, the oil ports of YV1, YV2, and YV3 are all in communication with the O port (low-pressure port). As a result, the pilot pressure ports of the three-way hydraulic control valves C1, C4, and C7 are in a low-pressure state, making the hydraulic oil circuit (external oil circuit, not shown in the figure) between the C1 hydraulic control valve and the X end in communication with the C3 hydraulic control valve and then in communication with the O port through the C3 hydraulic control valve. Similarly, the hydraulic oil circuit between the C4 hydraulic control valve and the X end is in communication with the O port through C6, and the hydraulic oil circuit between the C7 hydraulic control valve and the X end is in communication with the return oil O port through C9. At this time, the X end is in a low-pressure state.

[0050] No matter which one fails, any of the remaining two can, through the oil circuit combination of their respective hydraulic control valve groups, achieve the function of the normal operation of this hydraulic control device under specific working conditions (ESD interlock control).

[0051] Suppose the electromagnetic coil of any one of the three-way electric control valves is de-energized (for example, the electromagnetic coil of the YV1 electric control valve is de-energized). At this time, the high-pressure oil at the P port reaches C1, C5, and C6 through YV1; this high-pressure oil pushes the spool of the hydraulic control valve C1 to disconnect the C3 oil circuit from the X end, and the oil circuit at the oil outlet of C2 is in communication with the X end through C1. However, at this time, the oil circuit at the oil inlet of C2 is in a low-pressure state, and no high-pressure oil passes through C2 and C1 to reach the X end; although C5 is in a high-pressure state, the high-pressure oil cannot be in communication with the X end through C4 at this time; C6 is in a high-pressure state, which closes the oil circuit of the C6 hydraulic control valve, and the high-pressure oil cannot reach the X end through C6 and C4. Therefore, the X end is still in a low-pressure state.

[0052] Suppose that two solenoid valve coils of a three-way solenoid control valve are de-energized (for example, the solenoid valves YV1 and YV2 are de-energized). At this time, the high-pressure oil at port P reaches C1, C5, and C6 through YV1, and reaches C4, C8, and C9 through YV2. The high-pressure oil pushes the spool of the hydraulic control valve C1 to disconnect the oil path C3 from the X end and connect the oil path C2 to the X end, and pushes the spool of the hydraulic control valve C4 to disconnect the oil path C6 from the X end and connect the oil path C5 to the X end. At this time, since the pressure guiding port of the C9 hydraulic check valve is in a high-pressure state, the oil path of the C9 hydraulic check valve is closed, and the hydraulic oil at the low-pressure end is disconnected from the oil path communicating with the X end through C9, C7, and the X end. The high-pressure oil reaches the X end through C5 and C4. In this state, due to the oil path combination and the function of the hydraulic control valve, there is no oil path connecting the X end to the low-pressure end O port. Therefore, in the state where the two solenoid control valves are de-energized, the X end is in a high-pressure state, thus meeting the requirement for the normal operation of the hydraulic oil path as required.

[0053] For the above three hydraulic oil paths combined by solenoid control valves and hydraulic control valve groups, as long as any two or three solenoid control valves are de-energized, the action requirement of changing the X end from a low-pressure state to a high-pressure state can be achieved, avoiding the situation that in the past, in a hydraulic circuit controlled by a single solenoid control valve or a hydraulic control circuit with two solenoid valve oil paths connected in series, due to a fault in one of the solenoid control valves, the X end accidentally changes to a high-pressure state or fails to change to a high-pressure state. The three-way hydraulic oil path controlled by three solenoid control valves must have two or three paths conducting simultaneously for the X end to be at high pressure, that is, the hydraulic control device of the present application has a voting function.

[0054] It should be understood that expressions such as "including" and "may include" that can be used in the present application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In the present application, terms such as "including" and / or "having" can be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or a combination thereof, but cannot be interpreted as excluding the existence or the possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or a combination thereof.

[0055] As described above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claimed rights.

Claims

1. A hydraulic control device with a voting function, characterized in that Comprising: A plurality of hydraulic control circuits, which connect the solenoid valves and hydraulic control valve groups in different hydraulic control circuits in an associated manner, such that in an emergency state, the solenoid valves in more than half of the hydraulic control circuits drive the hydraulic control valve groups to act.

2. The hydraulic control device according to claim 1, characterized in that, The solenoid valve is a two-position three-way solenoid valve, and the hydraulic control valve group includes a two-position three-way hydraulic control reversing valve, a check valve, and a hydraulic control check valve.

3. The hydraulic control device according to claim 2, wherein, The two-position three-way solenoid valve is in an energized state under normal working conditions.

4. The hydraulic control device according to claim 2, characterized in that, Port 1 of the two-position three-way solenoid valve is connected to port O, port 2 is connected to port 1 of the two-position three-way hydraulic control reversing valve in the same hydraulic control circuit, port 1 of the check valve in another hydraulic control circuit, and port 3 of the hydraulic control check valve, and port 3 is connected to port P; Port 1 of the two-position three-way hydraulic control reversing valve is connected to port 2 of the two-position three-way solenoid valve in the same hydraulic control circuit, port 2 is connected to port 1 of the hydraulic control check valve in the same hydraulic control circuit, port 3 is connected to terminal X, and port 4 is connected to port 2 of the check valve in the same hydraulic control circuit; Port 1 of the hydraulic control check valve is connected to port 2 of the two-position three-way hydraulic control reversing valve in the same hydraulic control circuit, and port 2 is connected to port O; Port 1 of the check valve and port 3 of the hydraulic control check valve are connected to port 2 of the two-position three-way solenoid valve in an adjacent hydraulic control circuit.

5. The hydraulic control device according to claim 4, characterized in that, When the coil of the solenoid valve in a certain hydraulic control circuit loses power, port 2 of the check valve in this hydraulic control circuit is in a low-pressure state, and high-pressure oil cannot reach terminal X; port 2 of the two-position three-way solenoid valve is connected to the pilot pressure ports of the check valve and the hydraulic control check valve in an adjacent hydraulic control circuit, both of which are in a high-pressure state, but port 1 of the two-position three-way hydraulic control reversing valve in this hydraulic control circuit is in a low-pressure state, the 2nd and 3rd ports of this two-position three-way hydraulic control reversing valve are in a disconnected state, and high-pressure oil cannot reach terminal X at port 3 through port 2, and terminal X is in a low-pressure state.

6. The hydraulic control device according to claim 4, characterized in that, When the coils of the solenoid valves in more than half of the hydraulic control circuits lose power, in each de-energized hydraulic control circuit, the high-pressure oil pushes the spool of the two-position three-way hydraulic control reversing valve, disconnecting the oil path of the hydraulic control check valve in the adjacent hydraulic control circuit from terminal X, and at the same time, connecting the oil path of the check valve in the adjacent hydraulic control circuit to terminal X, and high-pressure oil reaches terminal X, and terminal X is in a high-pressure state.

7. The hydraulic control device according to claim 4, characterized in that The terminal X is a control terminal for connecting the hydraulic control valve of the main oil path; the port P is a high-pressure port for connecting the main control oil port, and the port O is a low-pressure port for connecting to the oil return tank.

8. The hydraulic control device according to claim 1, characterized in that, The state of the solenoid valve, whether it is conducting or closed, is monitored through a pressure gauge or a pressure transmitter.

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