Gate valve with adjustable self-weight of valve plate and self-weight adjusting method

Abstract

The invention provides a gate valve with a self-weight-adjustable valve plate and a self-weight adjusting method, relates to the technical field of gate valves, and is mainly used for solving the problem that a gate valve driven by a winch cannot be reliably closed in the prior art. The gate valve is mainly composed of a shell, a valve plate, a frame, a guide rail and a winch, a water storage cavity used for adjusting the weight of the valve plate is formed in the valve plate, and the water storage cavity is connected with a water supply system or a water supply and drainage system through a water injection pipe. When the descending speed of the valve plate is reduced or the valve plate stops descending, the self weight of the valve plate can be increased by injecting water into the water storage cavity, and it is guaranteed that the gate valve can be reliably closed. In addition, after the valve plate is completely closed, water in the water storage cavity can be discharged to reduce the opening weight of the valve plate, and the water storage cavity is prevented from rusting due to long-term water storage.

Description

Technical Field

[0001] The present invention relates to the technical field of gate valves, and in particular to a gate valve with adjustable valve plate deadweight and a deadweight adjustment method. Background Art

[0002] The gate valve, also known as the gate valve, is a commonly used medium cut-off valve, which is widely used in the fields of petroleum, chemical industry, water conservancy, metallurgy, mining, electricity, etc. According to the length of the valve plate stroke, the valve plates of small and medium-sized gate valves installed on small and medium-sized pipelines are mostly driven by cylinders, screws, etc.; the valve plates of large gate valves installed on large pipelines with a lifting height of more than 2 meters are mostly driven by winches.

[0003] See attached Figure 1 . The existing large-scale gate valve is mainly composed of a housing 1, a valve plate 2, a frame 3, a guide rail 4, a winch 5 and other components. When the valve is opened, the valve plate rises along the guide rail under the drag of the winch; when the valve is closed, the winch releases the rope, and the valve plate descends along the guide rail under the action of its own weight, thereby cutting off the medium channel. The sealing of the gate valve is mainly achieved by the frame-shaped sealing material arranged on both sides of the valve plate. In order to prevent medium leakage, a certain pre-tightening force is applied to the sealing material during the manufacture of the gate valve. The actual problem caused by this is that due to the existence of the pre-tightening force, the sealing material has a blocking effect on the lifting and lowering of the valve plate. In actual engineering applications, due to the influence of factors such as rust and deformation, the valve plate sometimes cannot descend by its own weight, resulting in the gate valve being unable to close normally. At the same time, most gate valves are mainly used as safety valves for engineering maintenance or emergency avoidance. It is generally not possible to try to close the gate valve to verify its reliability. Once the gate valve needs to be closed urgently, and the valve plate cannot fall due to various reasons, it may cause a safety accident. Summary of the invention

[0004] In order to overcome the deficiencies in the background technology, the present invention discloses a gate valve with adjustable valve plate deadweight and a deadweight adjustment method, the purpose of which is to increase the deadweight of the valve plate by injecting water into the valve plate to ensure that the gate valve can be reliably closed.

[0005] Specifically, the present invention adopts the following technical solutions: Technical solution 1:

[0006] A gate valve with adjustable valve plate deadweight, the gate valve mainly consists of a shell, a valve plate, a frame, a guide rail, and a winch. A water storage cavity for adjusting the weight of the valve plate is provided in the valve plate, and the water storage cavity is connected to a water supply system or a water supply and drainage system through a water injection pipe.

[0007] After implementing the above technical solution, compared with the background technology, the beneficial effect of the present invention is that the existing valve plates are solid and have no water storage chamber. The present invention sets a water storage chamber in the valve plate. When the valve plate cannot be closed by its own weight, water can be injected into the water storage chamber to increase the deadweight of the valve plate, thereby ensuring that the gate valve can be reliably closed.

[0008] Improved technical solution 2 based on technical solution 1: The water supply and drainage system includes a water source, pipes, a water pump and a valve group.

[0009] After implementing Technical Solution 2, the beneficial effect is that the water supply and drainage system can not only inject water into the water storage chamber to ensure the closure of the gate valve, but also reduce the dead weight of the valve plate by draining water to facilitate the reopening of the gate valve.

[0010] Improved technical solution 3 based on technical solution 1: the water injection pipe is a flexible water injection pipe inserted into the water storage cavity.

[0011] After implementing Technical Solution 3, the beneficial effects are: the valve plate will move up and down, and the water injection pipe uses a flexible water injection pipe that can move with the valve plate.

[0012] Improved technical solution 4 based on technical solution 3: the flexible water injection pipe is inserted into the water storage cavity from top to bottom, and the lower end of the flexible water injection pipe is close to the bottom of the water storage cavity.

[0013] After implementing Technical Solution 4, the beneficial effect produced is: the lower end of the flexible water injection pipe is close to the bottom of the water storage chamber, which can ensure that as much water as possible in the water storage chamber is pumped out.

[0014] Improved technical solution 5 based on technical solution 3: A hard tube is connected to one end of the flexible water injection pipe inserted into the water storage chamber, and the lower end of the hard tube is close to the bottom of the water storage chamber.

[0015] After implementing technical solution 5, the beneficial effect produced is: by connecting a hard pipe to one end of the flexible water injection pipe inserted into the water storage chamber, as much water as possible in the water storage chamber can be pumped out.

[0016] Improved technical solution 6 based on technical solution 1: the water injection pipe is a hard water injection pipe inserted into the water storage cavity.

[0017] Improved technical solution 7 based on technical solution 6: A guide sleeve is provided at the upper part of the water storage chamber, the upper end of the hard water injection pipe is fixed on the frame, and the lower end is vertically inserted into the guide sleeve and is slidably connected with the guide sleeve.

[0018] After implementing Technical Solution 7, the beneficial effect produced is: the hard water injection pipe is equivalent to a guide column, and the hard water injection pipe and the guide sleeve slide together to guide the up and down movement of the valve plate.

[0019] Improved technical solution 8 based on technical solution 7: A hose is connected to one end of the hard water injection pipe inserted into the water storage chamber.

[0020] After implementing technical solution 8, the beneficial effect is: a hose is connected to one end of the hard water injection pipe inserted into the water storage chamber, so that the lower end of the hose can be located at the bottom of the water storage chamber, which is conducive to extracting as much water as possible from the water storage chamber.

[0021] Improved technical solution 9 based on technical solutions 1-8: A method for adjusting the self-weight of a valve plate. During the process of closing the gate valve, when the valve plate slows down or stops descending, the water supply system or the water supply and drainage system injects water into the water storage chamber through the water injection pipe to increase the weight of the valve plate.

[0022] After implementing technical solution 9, the beneficial effect produced is: ensuring that the gate valve can be closed reliably.

[0023] Improved technical solution 10 based on technical solution 9: The water storage chamber is connected to a water supply and drainage system. After the valve plate is completely closed, the water supply and drainage system discharges the water in the water storage chamber through the water injection pipe to reduce the opening weight of the valve plate.

[0024] After implementing technical solution 10, the beneficial effects are as follows: first, outward drainage can reduce the opening weight of the valve plate, which helps to reduce the load of the winch lifting the valve plate; second, the switching frequency of the gate valve is very low, and long-term water storage will cause corrosion in the water storage chamber.

[0025] Improved technical solution 11 based on technical solution 9: The gate valve is provided with a speed sensor, which is used to detect the descending speed of the valve plate.

[0026] After implementing technical solution 11, the beneficial effect is: setting a speed sensor can determine whether the valve plate is closed at a normal speed without the need for on-site inspection by personnel.

[0027] Improved technical solution 12 based on technical solution 11: The gate valve is also provided with a control system. When the speed sensor detects that the valve plate descends slower or stops descending, the control system starts the water supply system or the water supply and drainage system to inject water into the water storage chamber.

[0028] After implementing technical solution 12, the beneficial effect is: combined with automatic control, the water storage chamber can be automatically filled with water without human operation, ensuring that the gate valve can be closed quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Attached Figure 1 What is shown is the structural schematic diagram of the existing gate valve.

[0030] Attached Figure 2 What is shown is a schematic diagram of the structure of the gate valve in Example 1.

[0031] Attached Figure 3 What is shown is the structural schematic diagram of the gate valve in Example 2.

[0032] Attached Figure 4 What is shown is the structural schematic diagram of the gate valve in Example 3.

[0033] Attached Figure 5 What is shown is the structural schematic diagram of the gate valve in Example 4.

[0034] Attached Figure 6 What is shown is the structural schematic diagram of the gate valve in Example 5.

[0035] In the attached drawings: 1. Shell; 2. Valve plate; 2.1. Water storage chamber; 2.2. Water injection port; 2.3. Guide sleeve; 3. Frame; 4. Guide rail; 5. Winch; 6. Water injection pipe; 6.1. Flexible water injection pipe; 6.2. Hard water injection pipe; 7. Hose; 8. Hard pipe; 9. Water pump; 10. Sleeve-shaped fixing member; 11. Speed ​​sensor. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that in the description of the present invention, the terms "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal connection of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Embodiment 1:

[0037] A gate valve with adjustable valve plate deadweight is mainly used to solve the problem that the gate valve driven by a winch in the prior art cannot be closed reliably. The composition structure and working principle of the gate valve are specifically described below.

[0038] See attached Figure 2The gate valve is mainly composed of a housing 1, a valve plate 2, a frame 3, a guide rail 4, a winch 5 and other components, and a pulley block is installed between the frame 3 and the valve plate 2. Different from the existing gate valve, a water storage chamber 2.1 for adjusting the weight of the valve plate 2 is provided in the valve plate 2, and the water storage chamber 2.1 is connected to the water supply system through a water injection pipe 6.

[0039] Specifically, a water injection port 2.2 is provided at the upper part of the water storage chamber 2.1, and a water injection pipe 6 is inserted into the water injection port 2.2, and the water injection pipe 6 is connected to the water supply system. It is worth noting that the water injection pipe 6 can be a flexible water injection pipe 6.1 or a hard water injection pipe 6.2. The water supply system can be municipal tap water or other pressurized water sources. Water is a convenient, cheap and easy-to-add counterweight. The water supply system injects water into the water storage chamber 2.1 through the water injection pipe 6, which can quickly increase the deadweight of the valve plate 2.

[0040] In addition, the present invention also provides a method for adjusting the deadweight of the valve plate 2. During the process of closing the gate valve, when the descending speed of the valve plate 2 slows down or stops descending, the water supply system injects water into the water storage chamber 2.1 through the water injection pipe 6 to increase the weight of the valve plate 2, thereby ensuring that the gate valve can be reliably closed. Embodiment 2:

[0041] See attached Figure 3 . In this embodiment, the water injection pipe 6 is a flexible water injection pipe 6.1, which is inserted into the water storage chamber 2.1 from top to bottom, and the lower end of the flexible water injection pipe 6.1 is close to the bottom of the water storage chamber 2.1. In order to ensure that the flexible water injection pipe 6.1 does not fall out of the water storage chamber 2.1 during the up and down movement of the valve plate 2, a sleeve-shaped fixing member 10 is provided on the flexible water injection pipe 6.1, and the flexible water injection pipe 6.1 is fixed in the water injection port 2.2 through the sleeve-shaped fixing member 10. In this way, during the up and down movement of the valve plate 2, the flexible water injection pipe 6.1 located outside the water storage chamber 2.1 will not fall out of the water storage chamber 2.1 due to its own weight or other reasons, and a section of the flexible water injection pipe 6.1 located in the water storage chamber 2.1 will not change its position.

[0042] The flexible water injection pipe 6.1 is connected to a water supply and drainage system, which is mainly composed of a water source, a pipeline, a valve group and a water pump 9, wherein the water pump 9 is a pumping pump, and the valve group is composed of a K1 valve and a K2 valve. The water source can be tap water, and when the K1 valve is opened, the water supply and drainage system injects water into the water storage chamber 2.1; when the water pump 9 and the K2 valve are opened, the water supply and drainage system pumps water out. The water source can also be a water supply tower, and when pumping water out, the pumped water returns to the water supply tower.

[0043] The advantage of the flexible water injection pipe 6.1 is that it can be bent freely, and when the gate valve is opened or closed, the flexible water injection pipe 6.1 can move up and down with the valve plate 2. The lower end of the flexible water injection pipe 6.1 is close to the bottom of the water storage chamber 2.1, which is conducive to the water supply and drainage system to pump out as much water as possible in the water storage chamber 2.1.

[0044] When the valve plate 2 cannot be closed by its own weight, the water supply and drainage system increases the weight of the valve plate 2 by injecting water into the water storage chamber 2.1 to ensure that the gate valve can be closed reliably. After the valve plate 2 is completely closed, the water supply and drainage system pumps the water in the water storage chamber 2.1 out through the flexible water injection pipe 6.1. Firstly, it is to reduce the weight of the valve plate 2 to facilitate the opening of the gate valve; secondly, the switching frequency of the gate valve is very low, and long-term water storage will cause the water storage chamber 2.1 to rust. Embodiment 3:

[0045] See attached Figure 4 The difference between this embodiment and embodiment 2 is that a hard tube 8 is connected to one end of the flexible water injection tube 6.1 inserted into the water storage chamber 2.1, and the lower end of the hard tube 8 is close to the bottom of the water storage chamber 2.1.

[0046] Based on the same purpose as in Example 2, a hard tube is connected to one end of the flexible water injection tube inserted into the water storage chamber, so as to pump out as much water as possible from the water storage chamber. Embodiment 4:

[0047] See attached Figure 5 In this embodiment, the water injection pipe 6 is a hard water injection pipe 6.2 made of metal or hard plastic. A guide sleeve 2.3 is provided at the water injection port 2.2. The upper end of the hard water injection pipe 6.2 is fixed on the frame 3, and the lower end is vertically inserted into the guide sleeve 2.3 and connected with the guide sleeve 2.3 by sliding fit. The hard water injection pipe 6.2 is equivalent to a guide column. The hard water injection pipe 6.2 and the guide sleeve 2.3 are slidably matched, which can guide the up and down movement of the valve plate 2.

[0048] In addition, a speed sensor 11 is installed on the frame 3. The speed sensor 11 is used to detect the descending speed of the valve plate 2, so as to judge the state of the valve plate 2 in time without the need for on-site inspection by personnel.

[0049] In order to realize automatic control, the gate valve is also provided with a control system. When the speed sensor 11 detects that the valve plate 2 slows down or stops descending, the control system starts the water supply and drainage system to inject water into the water storage chamber 2.1. Embodiment 5:

[0050] See attached Figure 6 The difference between this embodiment and the embodiment 4 is that a hose 7 is connected to one end of the hard water injection pipe 6.2 inserted into the water storage chamber 2.1.

[0051] In Example 4, the hard water injection pipe 6.2 does not move up and down with the valve plate 2, so the distance between the lower pipe opening of the hard water injection pipe 6.2 and the bottom of the water storage chamber 2.1 is variable, especially after the valve plate 2 is completely closed, the distance between the lower pipe opening of the hard water injection pipe 6.2 and the bottom of the water storage chamber 2.1 is the largest, and the water in the water storage chamber 2.1 cannot be basically pumped out.

[0052] The hose 7 is flexible and connected to one end of the hard water injection pipe 6.2 inserted into the water storage chamber 2.1, which can ensure that the lower end of the hose 7 is still located at the bottom of the water storage chamber 2.1 after the valve plate 2 is completely closed, which is conducive to pumping out as much water as possible in the water storage chamber 2.1. In order to achieve automatic drainage, after the valve plate 2 is completely closed, the control system turns on the water supply and drainage system to drain water outward.

[0053] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A gate valve with adjustable valve plate deadweight, the gate valve mainly consists of a housing, a valve plate, a frame, a guide rail, and a winch, characterized in that: A water storage cavity for adjusting the weight of the valve plate is arranged inside the valve plate, and the water storage cavity is connected with a water supply system or a water supply and drainage system through a water injection pipe.

2. A gate valve with adjustable valve plate deadweight as claimed in claim 1, characterized in that: The water supply and drainage system comprises a water source, a pipeline, a water pump and a valve group.

3. A gate valve with adjustable valve plate deadweight as claimed in claim 1, characterized in that: The water injection pipe is a flexible water injection pipe inserted into the water storage cavity.

4. A gate valve with adjustable valve plate deadweight as claimed in claim 3, characterized in that: The flexible water injection pipe is inserted into the water storage cavity from top to bottom, and the lower end of the flexible water injection pipe is close to the bottom of the water storage cavity.

5. A gate valve with adjustable valve plate deadweight as claimed in claim 3, characterized in that: One end of the flexible water injection pipe inserted into the water storage cavity is connected with a hard pipe, and the lower end of the hard pipe is close to the bottom of the water storage cavity.

6. A gate valve with adjustable valve plate deadweight as claimed in claim 1, characterized in that: The water injection pipe is a hard water injection pipe inserted into the water storage cavity.

7. A gate valve with adjustable valve plate deadweight as claimed in claim 6, characterized in that: A guide sleeve is arranged on the upper part of the water storage cavity. The upper end of the hard water injection pipe is fixed on the frame, and the lower end is vertically inserted into the guide sleeve and is slidably matched and connected with the guide sleeve.

8. A gate valve with adjustable valve plate deadweight as claimed in claim 7, characterized in that: A soft hose is connected to one end of the hard water injection pipe inserted into the water storage cavity.

9. A valve plate deadweight adjustment method applied to the gate valve according to any one of claims 1 to 8, characterized in that: In the process of closing the gate valve, when the descending speed of the valve plate slows down or stops descending, the water supply system or the water supply and drainage system injects water into the water storage cavity through the water injection pipe to increase the weight of the valve plate.

10. A valve plate self-weight adjustment method according to claim 9, characterized in that: The water storage chamber is connected to a water supply and drainage system. After the valve plate is completely closed, the water supply and drainage system discharges the water in the water storage chamber through the water injection pipe to reduce the opening weight of the valve plate.

11. A valve plate self-weight adjustment method according to claim 9, characterized in that: The gate valve is provided with a speed sensor, and the speed sensor is used to detect the descending speed of the valve plate.

12. A valve plate self-weight adjustment method according to claim 11, characterized in that: The gate valve is also provided with a control system. When the speed sensor detects that the valve plate descends slowly or stops descending, the control system starts the water supply system or the water supply and drainage system to inject water into the water storage chamber.

Images