Method for pressurizing the water seal back cavity of high head flat gate

Abstract

The application discloses a kind of high water head plane gate water seal back cavity pressurization method, comprising: plane gate is lifted to the outside of gate slot, and water filling reversing valve is installed on plane gate;Utilize hoist and pull rod to be hung to the gate slot of gate in plane gate;Top steel pipe is connected with water tank by first pressurizing pipeline, and water in water tank enters water filling reversing valve by first pressurizing pipeline, steel pipe under the action of pressure difference, and flows into water seal back cavity by water filling reversing valve, and pressure maintaining is carried out to water seal back cavity after pressurization is completed;When plane gate is pulled up or plane gate is lowered, the tension of pull rod makes valve stem be in upper limit position, valve plug is located in the upper part of sealing cavity of valve body, so that water in sealing cavity flows out through one-way water drain valve.The application can realize the pressurization and pressure maintaining of water seal back cavity when gate is closed, and pressure relief when opening and closing, thereby reducing the friction between gate and water seal during gate opening and closing, and reducing wear.

Description

Technical Field

[0001] This invention relates to the field of sealing high-head planar gates, and in particular to a pressurization method suitable for the back cavity of the water seal of a high-head planar gate. Background Technology

[0002] Pre-compression water seals are the most common type of water seal for planar gates, relying on the pre-compression of the water seal to seal the gap between the gate and the gate slot. However, when the water head of the gate is high, the required compression of the water seal is greater. A larger compression inevitably leads to greater frictional resistance during the opening and closing of the gate, resulting in severe wear of the water seal. Therefore, high-head planar gates in existing engineering projects mostly adopt a mountain-shaped water-stop type pressurized water seal (see...). Figure 1 The pressurization pressure is mostly based on reservoir water pressure. When the gate is blocking water, pressure is applied to the back cavity M1, causing the mountain-shaped rubber waterstop M2 to expand and deform, pressing tightly against the water seal pad M3 to achieve a seal. When the gate opens upwards, the pressure in the back cavity M1 is first released to reduce the water seal friction and wear during opening and closing. However, this pressurization method has the following problems in actual engineering: First, the back pressure of the pressurized water seal using reservoir water pressure is always consistent with the reservoir water head pressure, making the pressure uncontrollable and still causing water seal wear during opening and closing; second, when the reservoir water head pressure drops to a certain level, the water seal back pressure is insufficient, resulting in a poor water seal seal; third, for rivers with a lot of silt, silt may clog the back cavity, affecting the expansion and contraction of the water seal, and even causing pressurization failure. Summary of the Invention

[0003] In view of this, the present invention proposes a pressurization method for the back cavity of the water seal of a high-head planar gate.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: The pressurization method for the back cavity of the water seal of a high-head planar gate as described in this invention includes: The first step is to lift the planar gate to the outside of the gate slot and install a water-filling reversing valve on the planar gate. The water-filling reversing valve includes a valve body with a sealing cavity, a valve plug disposed in the valve body, a valve stem, and a one-way drain valve installed at the bottom of the valve body. The lower part of the valve stem is connected to the valve plug and the valve stem extends upward through the top cover of the valve body. A section of steel pipe is fixedly installed on each section of the pull rod of the planar gate. The second step involves using a hoist and a tie rod to lower the planar gate into the gate slot. Before lowering, the bottom of the lowest tie rod is connected to the gate via a pin, and the tie rod is connected to the lifting ring at the top of the valve stem. The valve body is connected to the water seal back cavity via the first flexible hose, and the valve body is connected to the steel pipe on the lowest tie rod via the second flexible hose. Then, the hoist is started, and the hoist lowers the planar gate into the gate slot via the lowest tie rod. The third step is to install a section of the tie rod on the bottom tie rod after it has been lowered into place, and then use a flexible hose to connect the steel pipe on the top tie rod to the steel pipe on the bottom tie rod. Repeat this process until the gate is hoisted into place. The fourth step is to connect the top steel pipe to the water tank on the maintenance platform through the first pressurization pipeline, open the second ball valve, the fourth ball valve, the fifth ball valve and the second electric ball valve on the first pressurization pipeline, and the water in the water tank enters the water filling reversing valve through the first pressurization pipeline and the steel pipe under the action of pressure difference, and then flows into the water seal back cavity through the water filling reversing valve. After the pressurization is completed, the water seal back cavity is pressure maintained. Fifth step: When the flat gate is pulled up or lowered, the pulling force of the lever puts the valve stem at the upper limit position, and the valve plug is located at the upper part of the sealing cavity of the valve body, so that the water in the sealing cavity flows out through the one-way drain valve.

[0005] The beneficial effects are as follows: When the gate is closed, the valve plug of the water-filling reversing valve is in its lowest position, achieving the sealing of the one-way drain valve. Water in the tank enters the sealing chamber of the water-filling reversing valve under the action of pressure difference, and then enters the back chamber under the action of pressure difference, achieving pressurization. After pressurization, the water level in the tank remains unchanged, providing a stable head pressure for maintaining pressure in the water seal back chamber. During the opening and closing of the gate, the valve plug in the water-filling reversing valve is located at the top of the sealing chamber and is higher than the second and first holes. Water in the water seal back chamber and the sealing chamber flows out directly through the one-way drain valve, thereby achieving pressure relief in the back chamber, reducing the friction between the gate and the water seal during the opening and closing process, and thus protecting the water seal. In addition, the pipelines and valves of this invention have an assembled structure, which can achieve rapid installation.

[0006] Preferably, the first pressurization pipeline is further equipped with a second check valve, a pressure relief valve, a flow meter, and an air vent valve. The flow meter is preferably an electromagnetic flow meter, which monitors the water flow during the pressure holding process, thereby monitoring the pressure holding status.

[0007] More preferably, a pressurization pipeline is connected and installed on the water tank. The outlet of the pressurization pipeline is located between the fourth ball valve and the second electric ball valve. A pressurization pump and a pressure gauge are installed on the pressurization pipeline. A first ball valve is installed on the pressurization pipeline upstream of the pressurization pump, and a first check valve and a second ball valve are installed on the pressurization pipeline downstream of the pressure gauge. The pressurization pipeline in this invention can be used to clean steel pipes.

[0008] Preferably, an inlet pipe is installed on the water tank, the inlet pipe is equipped with a filter and a first electric ball valve, and an venting ball valve is installed at the lower part or bottom of the water tank; a liquid level sensor is installed inside the water tank.

[0009] Compared with the prior art, the advantages of the present invention are as follows: In this invention, when the gate is closed, the valve plug of the water-filling reversing valve is in its lowest position, effectively sealing the one-way drain valve. The first and second pressurizing pipelines introduce clean water from the tank into the sealing chamber of the water-filling reversing valve, which then enters the back chamber under pressure differential, achieving pressurization. During gate opening and closing, the valve plug in the water-filling reversing valve is located at the top of the sealing chamber and higher than the second and first holes. Water in the back chamber and the sealing chamber flows directly out through the one-way drain valve, thereby depressurizing the back chamber, reducing friction between the gate and the water seal during gate opening and closing, and thus protecting the water seal. Furthermore, this invention features a modular structure, allowing for rapid installation. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the pressurized water seal of an existing high-head planar gate (the water seal has a mountain-shaped structure).

[0011] Figure 2 This is a schematic diagram of the closed state of the planar gate in this invention (the water seal back cavity is in a water-filled and pressure-maintaining state).

[0012] Figure 3 yes Figure 2 Enlarged schematic diagram of part A in the middle.

[0013] Figure 4 This is a schematic diagram showing the connection of the first pressurization pipeline, the steel pipe, and the water-filling reversing valve in this invention.

[0014] Figure 5 This is a schematic diagram of the water-filled reversing valve described in this invention. Detailed Implementation

[0015] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given. However, the scope of protection of the present invention is not limited to the following embodiments.

[0016] It should be noted that, in the description of this invention, relational terms such as “first” and “second” are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0017] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] It should be noted that the present invention is applicable to planar gates with hoisting mechanism and tie rod as lifting power. The tie rod is usually a segmented structure, with adjacent segments connected by pins. The bottom of the tie rod is connected to the ear plate on the gate by a pin. The ear plate is provided with an elongated hole, so that there is a certain amount of relative movement between the tie rod and the gate.

[0019] This invention proposes a method for pressurizing the back cavity of the water seal in a high-head planar gate, including... First, pull the planar gate 1 to the outside of the gate slot and install the water-filling reversing valve 6 on the planar gate 1. The water-filling reversing valve 6 includes a valve body 6.1 with a sealing cavity, a valve plug 6.2 disposed within the valve body 6.1, a valve stem 6.3 (the top of the valve stem 6.3 has a lifting ring 6.5), and a one-way drain valve 6.4 installed at the bottom of the valve body 6.1. The lower part of the valve stem 6.3 is connected to the valve plug 6.2, and the valve stem 6.3 extends upwards through the top cover of the valve body 6.1. A section of steel pipe 5.1 is fixedly installed on each section of the pull rod 10 of the planar gate 1, see... Figure 5 ; The second step involves using the hoist and pull rod 10 to lower the planar gate 1 into the gate slot. Before lowering, the bottom of the lowest pull rod 10 is connected to the planar gate 1 via a pin, and the pull rod 10 is connected to the lifting ring 6.5 at the top of the valve stem 6.3. The valve body 6.1 is connected to the water seal back cavity via the first hose L1, and the valve body 6.1 is connected to the steel pipe 5.2 on the lowest pull rod via the second hose L2. Then, the hoist is started, and the hoist lifts the planar gate 1 via the lowest pull rod 10. Placed into the gate slot; wherein, the planar gate 1 is provided with a first ear plate 1a (the elongated hole on the first ear plate 1a allows for a certain relative displacement between the pull rod 10 and the gate 1, providing space for the gate to swing), and a second ear plate 10a is provided at the lower part of the pull rod 10. The first ear plate 1a and the second ear plate 10a are connected by a pin, and the mounting hole on the first ear plate 1a is a vertically opened elongated hole; the lifting ring 6.5 of the valve stem 6.3 is connected to the lower part of the second ear plate 10a, see details. Figure 3 ; The third step is to install a tie rod section on top of the lowest tie rod after it has descended to its designated position. Then, use a flexible hose to connect the steel pipe on the upper tie rod to the steel pipe on the lowest tie rod. Continue lowering the flat gate downwards; repeat this process until the flat gate is in place. See details below. Figure 2 ; Fourth step, combine Figure 4The top steel pipe 5.1 is connected to the water tank 3 on the maintenance platform 2 through the first pressurization pipeline 4. The second ball valve F2, the fourth ball valve F4, the fifth ball valve F5, and the second electric ball valve DF2 on the first pressurization pipeline 4 are opened. Under the action of pressure difference, the water in the water tank 3 enters the water filling reversing valve 6 through the first pressurization pipeline 4 and the steel pipe 5.1, and flows into the water seal back cavity through the water filling reversing valve 6. After pressurization is completed, the water seal back cavity is pressure maintained. During the pressure maintenance process, the flow meter 8 is used to monitor the water flow. If there is water flow, it means there is a leak and maintenance is required. If no flow is detected, it means there is no leak and the water seal effect is good, thus realizing water seal monitoring.

[0020] Fifth step: During the upward or downward movement of the flat gate, the pulling force of the lever 10 causes the valve stem 6.3 to be in the upper limit position, and the valve plug 6.3 is located in the upper part of the sealing cavity of the valve body (the valve plug is located in...). Figure 4 (The dotted line indicates the position), allowing water in the sealing cavity of the valve body to flow out through the one-way drain valve. This invention ensures the gate is filled with water and maintains pressure when it is closed, and depressurizes the back cavity of the water seal during the gate's opening and closing process, thereby reducing friction and protecting the gate's water seal. This overcomes the problem of poor water seal performance in existing pressurized water seals.

[0021] In actual installation, a pressurization pipeline is also connected to the water tank 3. The outlet of the pressurization pipeline is located on the first pressurization pipeline 4 between the fourth ball valve F4 and the second electric ball valve DF2. A pressurization pump P and a pressure gauge 11 are installed on the pressurization pipeline. The outlet of the pressurization pipeline is connected to the first pressurization pipeline 4 upstream of the second electric ball valve DF2. A first ball valve F1 is installed on the pressurization pipeline upstream of the pressurization pump P. A first check valve F6 and a second ball valve F2 are installed sequentially on the pressurization pipeline downstream of the pressure gauge 11. The valve group on the first pressurization pipeline 4 includes a third ball valve F3, a second check valve F7, and a fourth ball valve F4 spaced apart on the first pressurization pipeline 4. The water inlet of the pressurization pipeline is connected to the first pressurization pipeline 4 upstream of the third ball valve F3, and its outlet is connected to the first pressurization pipeline 4 located between the fourth ball valve F4 and the second electric ball valve DF2. The first pressurization line 4 is also equipped with a pressure relief valve 7 and an exhaust valve 9 (automatic exhaust valve 9). During the flushing process, if the pressure is too high, the pressure relief valve 7 will automatically release the pressure. The valve on the first pressurization line 4 is normally open, and the valve on the pressurization line is normally closed. When cleaning is required, the second ball valve F2 and the fourth ball valve F4 are closed, and the valve on the pressurization line and the pressurization pump P are opened. The pressurization pump P is used to pressurize and flush the steel pipe.

[0022] During actual installation, an inlet pipe is connected to water tank 3 (the water in the tank is preferably tap water used in engineering projects, which has fewer impurities and thus avoids blockage of the water seal back cavity caused by mud and sand). A filter (using a Y-type filter to filter the water used in engineering projects, further preventing the water seal back cavity from being blocked by mud and sand and ensuring the sealing effect) and a first electric ball valve DF1 are installed on the inlet pipe. A venting ball valve F8 is installed at the lower part or bottom of water tank 3. A liquid level sensor (when using a photoelectric sensor, there are two liquid level sensors, one installed at the lower limit water level to monitor the lower limit water level, and one installed at the upper limit water level to monitor the upper limit water level) is installed in water tank 3. The signal output terminal of the liquid level sensor is connected to the signal output terminal of the controller. The control output terminal of the controller is connected to the control input terminals of the first electric ball valve DF1 and the second electric ball valve DF2. When the water tank 3 reaches the lower limit water level, the controller controls the first electric ball valve DF1 to open and add water to the water tank 3 until the water level in the water tank 3 rises to the upper limit height. When it is necessary to clean the water tank 3, open the drain ball valve F8 of the water tank 3 to drain the water in the water tank 3, and then the water tank 3 can be cleaned.

[0023] It should be noted that the aforementioned controller is preferably a PLC (which can be converted into a logic controller). Furthermore, the controller may also be equipped with a wireless communication module to connect with a remote terminal, receive control commands from the remote terminal, and provide feedback on relevant parameters of the real-time operating status.

[0024] In actual installation, each section of steel pipe 5.1 of the second pressurization pipeline 5 is equipped with a quick-connect coupling (such as a C-type self-locking quick-connect coupling) at both the upper and lower ends. The steel pipes 5.1 are connected by a flexible hose, and the quick-connect coupling facilitates the connection between the flexible hose and the steel pipe 5.1. The first pressurization pipeline 4 uses a flexible hose, which facilitates the connection with the steel pipe 5.1.

[0025] Finally, it should be emphasized that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for pressurizing the back cavity of a high-head planar gate water seal, characterized in that: include The first step is to lift the planar gate to the outside of the gate slot and install a water-filling reversing valve on the planar gate. The water-filling reversing valve includes a valve body with a sealing cavity, a valve plug disposed in the valve body, a valve stem, and a one-way drain valve installed at the bottom of the valve body. The lower part of the valve stem is connected to the valve plug and the valve stem extends upward through the top cover of the valve body. A section of steel pipe is fixedly installed on each section of the pull rod of the planar gate. The second step involves using a hoist and a tie rod to lower the planar gate into the gate slot. Before lowering, the bottom of the lowest tie rod is connected to the gate via a pin, and the tie rod is connected to the lifting ring at the top of the valve stem. The valve body is connected to the water seal back cavity via the first flexible hose, and the valve body is connected to the steel pipe on the lowest tie rod via the second flexible hose. Then, the hoist is started, and the hoist lowers the planar gate into the gate slot via the lowest tie rod. The third step is to install a section of the tie rod on the bottom tie rod after it has been lowered into place, and then use a flexible hose to connect the steel pipe on the top tie rod to the steel pipe on the bottom tie rod. Repeat this process until the gate is hoisted into place. The fourth step is to connect the top steel pipe to the water tank on the maintenance platform through the first pressurization pipeline, open the second ball valve, the fourth ball valve, the fifth ball valve and the second electric ball valve on the first pressurization pipeline, and the water in the water tank enters the water filling reversing valve through the first pressurization pipeline and the steel pipe under the action of pressure difference, and then flows into the water seal back cavity through the water filling reversing valve. After the pressurization is completed, the water seal back cavity is pressure maintained. Fifth step: When the flat gate is pulled up or lowered, the pulling force of the lever puts the valve stem at the upper limit position, and the valve plug is located at the upper part of the sealing cavity of the valve body, so that the water in the sealing cavity flows out through the one-way drain valve.

2. The pressurization method for the back cavity of the water seal of a high-head planar gate according to claim 1, characterized in that: The first pressurization pipeline is also equipped with a second stop valve, a pressure relief valve, a flow meter, and an exhaust valve.

3. The pressurization method for the back cavity of the water seal of a high-head planar gate according to claim 1, characterized in that: A pressurization pipeline is connected and installed on the water tank. The outlet of the pressurization pipeline is located between the fourth ball valve and the second electric ball valve. A pressurization pump and a pressure gauge are installed on the pressurization pipeline. A first ball valve is installed on the pressurization pipeline upstream of the pressurization pump, and a first check valve and a second ball valve are installed on the pressurization pipeline downstream of the pressure gauge.

4. The pressurization method for the back cavity of the water seal of a high-head planar gate according to claim 1, characterized in that: An inlet pipe is installed on the water tank, and a filter and a first electric ball valve are installed on the inlet pipe. An venting ball valve is installed at the bottom of the water tank. A liquid level sensor is installed inside the water tank.

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