Emergency system for closing water delivery valve without power

Abstract

The utility model relates to an emergency system capable of closing a water delivery valve without power, which comprises an oil pump motor group, an electromagnetic directional valve, an overflow valve, a water delivery valve oil cylinder, an oil tank, an emergency operation loop and a hydraulic pipeline communicated with each component, and an electromagnetic valve group is arranged between a rod cavity and a rodless cavity of the water delivery valve oil cylinder. The electromagnetic valve group comprises at least two electromagnetic valves which are connected in parallel, an emergency operation loop hard wiring, and a corresponding operation button is arranged at a position convenient to operate. When an electrical fault or a hydraulic fault occurs, the electromagnetic valve group can be opened, and the rod cavity and the rodless cavity of the oil cylinder are communicated, so that the water delivery valve is closed under the dead weight. And when the electromagnetic valve group is not electrified, the hydraulic system is not influenced to normally realize valve opening, valve closing and middle position keeping. Each electromagnetic valve in the electromagnetic valve group can be independently opened or closed, so that the closing speed of the valve can be controlled according to the electrified quantity of the electromagnetic valves, the impact caused by self-weight valve closing is reduced as much as possible, and the damage of emergency operation to a mechanical structure and a hydraulic structure is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of emergency operation of closing a water delivery valve without power during the operation of a ship lock, and particularly relates to an emergency system of a water delivery valve with controllable closing speed under the unpowered condition of a large ship lock. Background Art

[0002] Water conservancy projects have a blocking effect on rivers. Ship locks, especially large high-head ship locks, play an important role in navigation. They can realize the function of gradually lowering the water level, ensuring that ships can smoothly overcome the water level difference on the waterway of water conservancy projects. Hydraulic systems are widely used as the main power device in the mechanical equipment of various large-scale water conservancy projects due to their advantages such as fast response, high power, high performance and easy remote operation and control. Large ship locks generally use hydraulic systems as the opening and closing control systems of water transfer valves. Once the system fails, it will cause damage to mechanical equipment or hydraulic structures, and in severe cases, it will also cause the interruption of the ship lock operation process. Therefore, a reliable water transfer valve hydraulic system and emergency operation method are the key to ensuring the safe operation of large ship locks.

[0003] If an abnormal situation occurs during the water delivery process of a large single-stage or multi-stage ship lock, the water delivery valve must be closed immediately. According to relevant industry research, common water delivery valve control system failures may include the following aspects:

[0004] Fault 1: During the process of closing the water delivery valve, the contactor of the electronic control system failed, causing the electromagnet of the related solenoid valve to fail to operate in time. Since the oil circuit was not connected, the pressure oil could not enter the rodless chamber of the water delivery valve cylinder and overflow back to the oil tank through the safety valve. The system could not perform the valve closing action, so the water delivery valve could not be closed in time. At this time, emergency operation of the hydraulic system of the ship lock water delivery valve was required.

[0005] Fault 2: During the operation of the water delivery valve, there is a sudden power outage. In addition to the circuit power supply, the electrical system of the large ship lock is also equipped with a backup power supply. The backup power supply can only drive the electromagnet to operate, but cannot drive the motor to operate. That is, when the power is lost, the hydraulic system of the water delivery valve is in a powerless state. At this time, emergency operation is required to achieve reliable closure of the water delivery valve. The backup power supply can provide power for the operation of each solenoid valve during emergency operation, but cannot provide power for the motor to operate. Therefore, the water delivery valve can only be closed by the cylinder and the deadweight of the valve under the current working conditions.

[0006] Fault 3: The valve closes too slowly during emergency operation. When the water valve is closed under its own weight, in addition to the downward weight of the valve and the oil cylinder, it is also affected by the friction and buoyancy of the water valve guide rail. If the closing speed is too slow, the water valve may reach a force balance state, resulting in a slow closing of the water valve or even failure to close, which cannot meet the "emergency" requirements of emergency operation, and may cause over-filling and over-discharge of multi-stage ship locks or excessive reverse head of single-stage ship locks, thereby damaging the hydraulic system of the water valve and other mechanical equipment.

[0007] Fault 4: The closing speed is too fast during emergency operation. When the water supply valve is closed under the action of its own weight, if the friction of the guide rail is small, the valve may close quickly and still maintain a high speed near the closing end, causing the valve bottom water stop to be greatly impacted when the water supply valve is closed, which may cause damage to the bottom water stop and even damage to the hydraulic structure in severe cases. Utility Model Content

[0008] The purpose of the utility model is to provide a water delivery valve emergency closing system and operation method in a non-powered state, which does not affect the normal opening and closing of the water delivery valve, and can provide a simple and fast emergency closing operation of the water delivery valve in an emergency (such as electromagnet blocking, system power outage), meeting the requirements of controllable and adjustable valve closing speed, simple operation and high safety.

[0009] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme for an emergency system for closing a water delivery valve without power:

[0010] An emergency system for closing a water delivery valve without power, comprising an oil pump motor unit, an electromagnetic reversing valve, a relief valve, a water delivery valve oil cylinder, an oil tank and a hydraulic pipeline connecting various components, wherein the electromagnetic reversing valve comprises a P port, a T port, an A port and a B port, the output end of the oil pump motor unit is connected to the P port of the electromagnetic reversing valve, the A port is connected to the rodless cavity of the water delivery valve oil cylinder, the B port is connected to the rod cavity of the water delivery valve oil cylinder, and the T port is connected to the oil tank;

[0011] The output end of the oil pump motor group is connected to the input end of the overflow valve, and the output end of the overflow valve is connected to the oil tank;

[0012] The electromagnetic reversing valve includes a middle position, a left position and a right position. In the middle position function, the P port is directly connected to the T port. In the left position function, the P port is connected to the A port, and the T port is connected to the B port. In the right position function, the P port is connected to the B port, and the T port is connected to the A port.

[0013] An electromagnetic valve group is arranged between the rod chamber and the rodless chamber of the water delivery valve cylinder. The emergency system for closing the water delivery valve without power also includes an emergency operation circuit for supplying power to the electromagnetic valve group. The electromagnetic valve group includes at least two parallel electromagnetic valves, each of which has an input end connected to the rod chamber of the water delivery valve cylinder and an output end connected to the rodless chamber of the water delivery valve cylinder. The electromagnetic valve group includes a gain potential and a loss potential. In one of the gain potential and loss potential states, the input end and the output end of the electromagnetic valve are isolated, and in the other state, the input end and the output end of the electromagnetic valve are connected to connect the rod chamber and the rodless chamber of the water delivery valve cylinder. The emergency operation circuit is hard-wired, and the corresponding operation button is arranged at a position convenient for operation.

[0014] Furthermore, it also includes a balancing valve, the upper chamber of the balancing valve is connected to the rod chamber of the water transfer valve cylinder, the lower chamber of the balancing valve is connected to the B port of the electromagnetic reversing valve, the control oil circuit of the balancing valve is connected to the hydraulic oil entering the rodless chamber of the water transfer valve cylinder, the balancing valve includes a left position and a right position, the balancing valve has a throttling effect in the left position function, and the balancing valve has a function of allowing the hydraulic oil to pass only in one direction from bottom to top in the right position function.

[0015] Further, when the control oil circuit is opened, the balancing valve is in the left position.

[0016] Furthermore, the solenoid valve group includes four parallel solenoid valves. When the solenoid valve is in a de-energized state, its input end and output end are isolated. When the solenoid valve is in a energized state, its input end and output end are connected to connect the rod chamber and the rodless chamber of the water supply valve cylinder.

[0017] Furthermore, the oil port models of the solenoid valves are 6T=SAE6, 3G=G 3 / 8.

[0018] Furthermore, the solenoid valves are all solenoid ball valves.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. When an electrical system failure occurs, because the emergency operation circuit powered by the solenoid valve group is hard-wired, it is not controlled by PLC. The solenoid valve group can be opened by directly operating the corresponding operation button. When the solenoid valve group is working, it is directly connected to the upper and lower chambers of the water delivery valve cylinder to form a differential circuit. The pressure oil can enter the rodless chamber from the rod chamber of the cylinder without passing through the balance valve. The cylinder can extend the piston rod under the deadweight of the anti-arc door, and the water delivery valve will be reliably closed to complete the emergency valve closing function. In addition, the operation button in the emergency operation circuit is directly arranged near the operator's work position, so there is no need to go to the site for emergency operation, which is more reliable.

[0021] The solenoid valve used in the solenoid valve group is a high-locking solenoid ball valve. Its good locking performance ensures low system leakage and high reliability during emergency operation.

[0022] The solenoid valve group has high integration, occupies a small space, and does not affect the normal operation of the hydraulic system when it is powered off.

[0023] The solenoid valve group uses multiple solenoid ball valves, which are controlled in groups and can control the valve speed according to the number of solenoid valves that are energized. It can adapt to the emergency operation requirements of ship locks with different working water heads, and can realize the rapid closure of the water delivery valve when the water head is high and the opening is large, and can also realize the slow closure of the water delivery valve when the water head is low and the opening is small. Under the premise of ensuring safety, the impact caused by the closing of the valve due to its own weight can be reduced as much as possible, and the damage to the ship lock mechanical equipment and hydraulic structures caused by emergency operations can be reduced.

[0024] The oil port size of the solenoid valve in the solenoid valve group is appropriate. When the water head difference between the upstream and downstream of the water delivery valve is large and the valve opening is also large, the four groups of solenoid valves can be energized at the same time when the opening is large and the water head is high. At this time, under the action of the deadweight of the water delivery valve, the oil in the rod chamber passes through the four groups of solenoid valves at a large flow rate into the rodless chamber of the oil cylinder, and the valve closes at a faster speed; when the water delivery valve is closed to a small opening, some solenoid valves can be controlled to lose power, and the pressure oil only passes through the partially energized and opened solenoid valves from the rod chamber to the rodless chamber, the flow rate becomes smaller, and the valve closing speed becomes slower. When approaching the closing end position, only one group of solenoid valves can be opened. At this time, the pressure oil only relies on one group of solenoid valves to enter the rodless chamber from the rod chamber, and the valve closing speed is further slowed down, and finally slowly reaches the closing end position, further reducing the damage to the metal structure, hydraulic structure, and hydraulic system of the ship lock by emergency operation, and improving the safety and reliability of the emergency operation circuit.

[0025] A balancing valve is provided on the oil inlet pipe of the rod chamber of the water delivery valve. When the valve is opened, no electromagnet of the balancing valve is energized, which simplifies the valve opening steps, reduces energy consumption, reduces the failure points of the electronic control system, and improves the overall reliability of the system.

[0026] It can realize the function of maintaining the water delivery valve at any opening. When closing the valve, the valve core of the balancing valve moves to the right under the action of the pressure oil in the rodless chamber, and the oil flowing out of the rod chamber passes through the throttle hole of the balancing valve and then enters the return oil pipe (oil tank) through the electromagnetic reversing valve. If the system stops when the water delivery valve is in the middle position, there is no pressure oil in the rodless chamber of the water delivery valve, and the balancing valve automatically switches to the right position function, and the oil cannot pass through the balancing valve. The water delivery valve can be reliably maintained in the middle position, realizing the function of maintaining the water delivery valve in any position. When opening the valve, the control oil circuit of the balancing valve cannot be connected, and the balancing valve will also perform the right position function, so that the water delivery valve can be reliably maintained in the middle position.

[0027] The parts not involved in the device are the same as the existing technology or can be implemented by using the existing technology. The utility model has a scientific and reasonable structure, is safe and convenient to use, and provides great help to people. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 It is a system diagram of an emergency system for closing a water delivery valve without power in the utility model;

[0030] Figure 2 yes Figure 1 Layout diagram of the solenoid valve group;

[0031] Figure 3 It is the hydraulic oil flow circuit diagram when performing valve opening operation;

[0032] Figure 4 It is the hydraulic oil flow circuit diagram when performing valve closing operation;

[0033] In the figure: 1. Oil pump motor unit; 2. Overflow valve; 3. Three-position four-way solenoid reversing valve; 4. Solenoid valve group D; 5. Balance valve; 6. Water delivery valve cylinder; 7. Oil tank; 41. D1 solenoid valve; 42. D2 solenoid valve; 43. D3 solenoid valve; 44. D4 solenoid valve. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] An embodiment of an emergency system for closing a water delivery valve without power of the utility model:

[0036] An emergency system for closing a water delivery valve without power comprises an oil pump motor unit 1, an overflow valve 2, a three-position four-way electromagnetic reversing valve 3, an electromagnetic valve unit 4, a balancing valve 5, a water delivery valve oil cylinder 6, an oil tank 7 and a hydraulic pipeline connecting various components, wherein the water delivery valve oil cylinder 6 is connected to the water delivery valve through a suspension rod, and the water delivery valve is closed when the water delivery valve oil cylinder 6 is extended, and the water delivery valve is opened when the water delivery valve oil cylinder 6 is retracted.

[0037] The output end of the oil pump motor group 1 is connected to the P port of the three-position four-way electromagnetic reversing valve 3, the A port of the three-position four-way electromagnetic reversing valve 3 is connected to the rodless chamber of the water delivery valve oil cylinder 6, the B port is connected to the lower chamber of the balance valve 5, the upper chamber of the balance valve 5 is connected to the rod chamber of the water delivery valve oil cylinder 6, and the control oil circuit of the balance valve 5 is connected to the hydraulic oil entering the rodless chamber of the water delivery valve oil cylinder 6. The electromagnetic valve group 4 is arranged between the rod chamber and the rodless chamber of the water delivery valve oil cylinder 6, and the electromagnetic valve group D is composed of 4 parallel two-position two-way electromagnetic valves, namely the D1, D2, D3, and D4 electromagnetic valves. The input ends of the four electromagnetic valves are connected to the rod chamber of the water delivery valve oil cylinder 6, and the output ends are connected to the rodless chamber of the water delivery valve oil cylinder 6. The balance valve 5 is arranged on the oil inlet pipe of the lower chamber of the electromagnetic valve group 4, the upper chamber of the balance valve 5 is connected to the rod chamber of the water delivery valve oil cylinder 6, and the lower chamber is connected to the three-position four-way electromagnetic reversing valve 3. When the water supply valve is normally closed, the solenoid valve group 4 is not energized and is in the closed position; when emergency operation is required, the solenoid valve group 4 opens, connecting the rod chamber and the rodless chamber of the water supply valve cylinder 6, and the hydraulic oil in the rod chamber flows into the rodless chamber through the solenoid valve group 4 to complete the emergency closing.

[0038] The structure of the solenoid valve group 4 is as follows Figure 2 As shown, the D1, D2, D3, and D4 solenoid valves all include two states: powered and de-powered. When powered, the oil port of the valve block in the corresponding solenoid valve is opened, and the oil can enter the solenoid valve from the input end and then flow out from the output end; when de-powered, the oil port of the valve block in the corresponding solenoid valve is blocked, and the oil cannot pass through the corresponding solenoid valve. The D1 solenoid valve 41, the D2 solenoid valve 42, the D3 solenoid valve 43, and the D4 solenoid valve 44 are controlled by independent operating buttons, so any one or several solenoid valves can be opened separately. The more solenoid valves that are powered, the greater the flow rate of the solenoid valve group 4. Therefore, by adjusting the number of solenoid valves that are powered, the flow rate and the speed of closing the valve can be adjusted.

[0039] In this solution, the oil port model of D1, D2, D3, and D4 solenoid valves are all 6T=SAE6, 3G=G 3 / 8. The oil port aperture of this type of solenoid valve is moderate. When the four solenoid valves are fully open, the closing time of the water supply valve is about 1 minute. The water supply valve can maintain a suitable closing speed, and the water supply valve will not close too quickly to impact or even damage the bottom water stop of the water supply valve.

[0040] Of course, it is understandable that in other embodiments, when the model of the water delivery valve to be controlled changes, the number of solenoid valves in the solenoid valve group 4 and the model of the oil port need to be flexibly changed according to the actual situation.

[0041] In this scheme, the three-position four-way solenoid reversing valve 3 has three states. When the reversing valve electromagnet is not energized, the three-position four-way solenoid reversing valve 3 is in the middle position function, and the oil cannot enter and pass through the three-position four-way solenoid reversing valve 3; when the left electromagnet is energized, the three-position four-way solenoid reversing valve 3 is in the left position function, the P port is connected to the A port, and the T port is connected to the B port, realizing a parallel oil circuit; when the right electromagnet is energized, the three-position four-way solenoid reversing valve 3 is in the right position function, at this time the P port is connected to the B port, and the T port is connected to the A port, realizing a cross oil circuit.

[0042] In this solution, the hydraulic oil output by the oil pump motor unit 1 reaches the P port of the three-position four-way solenoid reversing valve 3 through the hydraulic pipeline. When the three-position four-way solenoid reversing valve 3 is in the middle position (O type), the hydraulic oil cannot pass through the three-position four-way solenoid reversing valve 3. When the hydraulic oil pressure in the pipeline accumulates to the set pressure of the relief valve 2, the relief valve 2 opens, and the pressure oil flows back to the oil tank through the relief valve 2. Therefore, the relief valve 2 acts as a safety valve. When the system pressure exceeds the set pressure of the relief valve 2, the relief valve 2 overflows for protection.

[0043] In this scheme, when the water delivery valve is opened, the balancing valve 5 performs the right position function, which is equivalent to a one-way valve, and the pressure oil enters the balancing valve 5 through the lower chamber input end of the balancing valve 5, and enters the rod chamber of the water delivery valve oil cylinder 6 through the upper chamber output end of the balancing valve 5. When the water delivery valve is closed, the valve core of the balancing valve 5 moves to the right under the action of the pressure oil. At this time, the balancing valve 5 performs the left position function. After the pressure oil enters the balancing valve 5 through the upper chamber input end, it passes through the throttle hole in the balancing valve 5 and enters the pipeline of the hydraulic system from the lower chamber output end.

[0044] In this scheme, when the water delivery valve is opened, the electromagnet on the right side of the three-position four-way electromagnetic reversing valve 3 is energized to realize the cross oil circuit, and the oil enters from the P port and flows out from the B port, enters the lower chamber of the balance valve 5 through the hydraulic pipeline, and then enters the rod chamber of the water delivery valve cylinder 6 through the balance valve 5. The oil in the rod chamber pushes the cylinder piston rod upward, and the oil in the rodless chamber of the water delivery valve cylinder 6 enters the A port of the three-position four-way electromagnetic reversing valve 3 through the hydraulic pipeline, and then flows back to the oil tank 7 through the T port, completing the valve opening process. The corresponding oil circuit flow direction of this process is as follows Figure 3 shown.

[0045] In this solution, when the water supply valve is closed normally, the electromagnet on the left side of the three-position four-way solenoid reversing valve 3 is energized, the three-position four-way solenoid reversing valve 3 is in the left position function, the hydraulic oil flows in through the P port and flows out through the A port, and then enters the rodless chamber of the water supply valve cylinder 6, and the hydraulic oil pushes the piston rod downward. The balancing valve 5 is in the left position function under the action of the hydraulic oil in the control oil circuit, and the rod chamber of the water supply valve cylinder 6 is connected to the left position function of the balancing valve 5 through the hydraulic pipeline. The hydraulic oil in the rod chamber of the water supply valve cylinder 6 enters the B port of the three-position four-way solenoid reversing valve 3 through the balancing valve 5, and then flows back to the oil tank 7 through the P port, completing the valve closing process. The corresponding oil circuit flow direction of this process is as follows: Figure 4 shown.

[0046] In this solution, the electrical control system of the solenoid valve group 4 (D1, D2, D3, D4 solenoid valves) used for emergency closure of the water supply valve is an independent system, and its operation buttons are directly arranged near the operator's work position. The electrical signals of each solenoid valve in the solenoid valve group 4 are not processed by the PLC of the lock operation system.

[0047] The balancing valve 5 plays a throttling role when the valve is closed normally; when performing the intermediate holding function or the emergency operation function, the balancing valve 5 plays a one-way valve function to reduce the downward leakage of the hydraulic oil in the rod chamber. Of course, it can be understood that in other embodiments, the balancing valve 5 can be completely replaced by other components with similar functions.

[0048] The utility model discloses an emergency system for closing a water delivery valve without power, which can execute valve opening operation and valve closing operation. In the valve opening operation and valve closing operation, an intermediate position holding function can be realized as needed. When an electrical fault or a hydraulic system fault occurs in the valve closing operation, an emergency operation is required to close the water delivery valve.

[0049] The steps for opening the valve are as follows:

[0050] S11: No-load operation, the electromagnet of the three-position four-way solenoid reversing valve 3 is not energized and is in the middle position. The motor starts to drive the hydraulic pump to operate. At this time, the relief valve 2 works as a safety valve. When the hydraulic system pressure exceeds the set pressure of the relief valve 2, the valve core of the relief valve 2 opens, and the oil returns to the oil tank 7 through the relief valve 2.

[0051] S12: Valve opening operation, the right electromagnet of the three-position four-way electromagnetic reversing valve 3 is energized, the motor drives the hydraulic pump to operate, and the hydraulic oil enters the rod chamber of the water delivery valve cylinder 6 through the three-position four-way electromagnetic reversing valve 3 and the balance valve 5, pushing the cylinder piston rod upward to complete the valve opening action. The pressure oil in the rodless chamber of the water delivery valve cylinder 6 enters the return oil pipe through the three-position four-way electromagnetic reversing valve 3 and returns to the oil tank 7.

[0052] The steps for valve closing operation are as follows:

[0053] S21: No-load operation, the electromagnet of the three-position four-way solenoid reversing valve 3 is not energized and is in the middle position. The motor starts to drive the hydraulic pump to operate. At this time, the relief valve 2 works as a safety valve. When the hydraulic system pressure exceeds the set pressure of the relief valve 2, the valve core of the relief valve 2 opens, and the oil returns to the oil tank 7 through the relief valve 2.

[0054] S22: Valve closing operation, the motor drives the hydraulic pump to operate, the left electromagnet of the three-position four-way solenoid reversing valve 3 is energized, and the pressure oil enters the rodless chamber of the water supply valve cylinder 6 through the A port of the three-position four-way solenoid reversing valve 3, pushing the cylinder piston rod to move downward, and the hydraulic oil in the rodless chamber of the water supply valve cylinder 6 pushes the valve core of the balance valve to move to the right, and the pressure oil in the rod chamber passes through the throttle hole in the left position of the balance valve 5 and the B port of the three-position four-way solenoid reversing valve 3 into the return oil pipe and returns to the oil tank 7.

[0055] The operation method when the middle position holding function needs to be realized is as follows:

[0056] When the water delivery valve oil cylinder 6 is in the non-open and non-closed end positions, the motor in the oil pump motor unit 1 and the three-position four-way electromagnetic reversing valve 3 are not energized, the three-position four-way electromagnetic reversing valve 3 is in the middle position, and the pressure generated by the deadweight of the water delivery valve acts on the rod chamber of the water delivery valve oil cylinder 6. The rod chamber is under pressure, and the rodless chamber is under tension. At this time, the control oil circuit of the balance valve 5 cannot be opened, so the balance valve 5 is in the right position, and its interior is a one-way valve, which ensures that the pressure oil in the rod chamber can only act on the upper chamber of the balance valve 5 but cannot pass through the balance valve 5, thereby achieving the middle position of the water delivery valve.

[0057] When an electrical system failure occurs, the oil circuit cannot be connected, and the pressure oil cannot enter the rodless chamber of the water transfer valve cylinder 6 and overflow back to the oil tank through the safety valve. Or, when a hydraulic system failure occurs, such as when the overflow valve 2 or the three-position four-way electromagnetic reversing valve 3 is damaged during the water transfer process, the hydraulic system pressure cannot be established, and the water transfer valve cannot be closed in time, which may cause damage to the hydraulic structure, metal structure, and hydraulic system of the ship lock, and even cause economic losses or even personal injury to ships passing through the lock. The water transfer valve needs to be closed without power, that is, to perform emergency operations. The methods of emergency operations are as follows:

[0058] At this time, the solenoid valve group 4 is opened to connect the rod chamber and the rodless chamber of the water supply valve cylinder 6. The pressure oil enters the rodless chamber from the rod chamber, and the piston rod of the water supply valve cylinder 6 extends under the action of the water supply valve's own weight, thereby closing the water supply valve.

[0059] It should be emphasized that the emergency operation circuit of the solenoid valve group 4 is hard-wired and is not controlled by the PLC. Therefore, when the electrical system fails, it will not affect the operation of the solenoid valve group 4.

[0060] When performing emergency operations, the number of solenoid valves to be opened in the solenoid valve group 4 is positively correlated with the opening of the water delivery valve. If the water delivery valve is opened relatively large (e.g., more than 70%) when an electrical system / hydraulic system failure occurs, the corresponding operation buttons of the D1, D2, D3, and D4 solenoid valves can be operated simultaneously to energize the D1, D2, D3, and D4 solenoid valves at the same time to ensure that the water delivery valve is quickly closed. If the water delivery valve is opened relatively small (e.g., less than 50%), the D1, D2 solenoid valves or other solenoid valves can be energized to close the water delivery valve at a slower speed to avoid damage to the water stop at the bottom of the water delivery valve.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An emergency system for closing a water delivery valve without power, comprising an oil pump motor unit, an electromagnetic reversing valve, a relief valve, a water delivery valve cylinder, an oil tank and a hydraulic pipeline connecting various components, characterized in that: The electromagnetic reversing valve comprises a P port, a T port, an A port and a B port, the output end of the oil pump motor unit is connected to the P port of the electromagnetic reversing valve, the A port is connected to the rodless chamber of the water delivery valve oil cylinder, the B port is connected to the rod chamber of the water delivery valve oil cylinder, and the T port is connected to the oil tank; The output end of the oil pump motor group is connected to the input end of the overflow valve, and the output end of the overflow valve is connected to the oil tank; The electromagnetic reversing valve includes a middle position, a left position and a right position. In the middle position function, the P port is directly connected to the T port. In the left position function, the P port is connected to the A port, and the T port is connected to the B port. In the right position function, the P port is connected to the B port, and the T port is connected to the A port. An electromagnetic valve group is arranged between the rod chamber and the rodless chamber of the water delivery valve cylinder. The emergency system for closing the water delivery valve without power also includes an emergency operation circuit for supplying power to the electromagnetic valve group. The electromagnetic valve group includes at least two parallel electromagnetic valves, each of which has an input end connected to the rod chamber of the water delivery valve cylinder and an output end connected to the rodless chamber of the water delivery valve cylinder. The electromagnetic valve group includes a gain potential and a loss potential. In one of the gain potential and loss potential states, the input end and the output end of the electromagnetic valve are isolated, and in the other state, the input end and the output end of the electromagnetic valve are connected to connect the rod chamber and the rodless chamber of the water delivery valve cylinder. The emergency operation circuit is hard-wired, and the corresponding operation button is arranged at a position convenient for operation.

2. The emergency system for closing a water delivery valve without power according to claim 1, characterized in that: It also includes a balancing valve, the upper chamber of the balancing valve is connected to the rod chamber of the water delivery valve cylinder, the lower chamber of the balancing valve is connected to the B port of the electromagnetic reversing valve, the control oil circuit of the balancing valve is connected to the hydraulic oil entering the rodless chamber of the water delivery valve cylinder, the balancing valve includes a left position and a right position, the balancing valve plays a throttling role in the left position function, and the balancing valve plays a role in allowing the hydraulic oil to pass only in one direction from bottom to top in the right position function.

3. The emergency system for closing a water delivery valve without power according to claim 2, characterized in that: When the control oil circuit is opened, the balance valve is in the left position.

4. The emergency system for closing a water delivery valve without power according to claim 1, characterized in that: The solenoid valve group includes four parallel solenoid valves. When the solenoid valve is in a de-energized state, its input end and output end are isolated. When the solenoid valve is in a energized state, its input end and output end are connected to connect the rod chamber and the rodless chamber of the water delivery valve cylinder.

5. The emergency system for closing a water delivery valve without power according to claim 4, characterized in that: The oil port models of the solenoid valves are 6T=SAE6, 3G=G 3 / 8.

6. The emergency system for closing a water delivery valve without power according to claim 4, characterized in that: The solenoid valves are all solenoid ball valves.

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