Gate valve with downstream pipe burst emergency shutoff function

Abstract

The utility model provides a gate valve with a downstream pipe burst emergency shutoff function. The gate valve comprises a water flow channel, and a valve rod provided with a main control channel can drive a gate plate to move in the vertical direction. One end of the upstream control channel communicates with the upstream end of the water flow channel, the other end of the upstream control channel communicates with the main control channel, and the main control channel can be inserted into the flashboard through a connecting pin at the internal positive pressure control bottom end. One end of the downstream control channel is communicated with the downstream end of the water flow channel, the other end of the downstream control channel can be communicated with the main control channel through a pressure relief guide valve, the pressure relief guide valve can block the main control channel or enable positive pressure in the main control channel to be discharged from the pressure relief guide valve, and therefore the connection pin is separated from the flashboard. The upstream control channel and the downstream control channel are communicated with the main control channel, so that the connecting pin can be inserted into the flashboard through water pressure, and when the pressure in a downstream middle pipeline is reduced, a medium with pressure in the main control channel can be discharged from the pressure relief guide valve, so that the flashboard can block a water flow channel.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, in particular to a gate valve with a downstream pipe burst emergency shut-off function. Background Art

[0002] Gate valves have the characteristics of low fluid resistance and high transmission efficiency. They are widely used in urban water supply systems in various temperature ranges. With the acceleration of urbanization and the continuous growth of water supply demand in various scenarios, higher requirements are placed on the performance, reliability and intelligence level of gate valves.

[0003] Since gate valves are usually not suitable for regulating the flow rate in pipelines, they are often opened to the maximum limit position in the normally open state. At this time, when a pipe bursts downstream and the drainage volume is too large, the upstream gate valve cannot detect the sudden situation downstream in time, so the gate valve cannot be closed in time, and the continuous water supply is likely to cause a large amount of water resources to be wasted. Therefore, how to close the gate valve in time when facing a downstream pipe burst becomes an urgent problem to be solved. Utility Model Content

[0004] In view of this, the present invention aims to provide a gate valve with a downstream pipe burst emergency shut-off function, so that the valve body can be closed in time when a pipe burst occurs downstream, resulting in excessive water discharge.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] A gate valve with a downstream pipe burst emergency shutoff function, comprising

[0007] The gate valve body includes a water flow channel, a gate plate disposed in the middle of the water flow channel, a valve stem capable of driving the gate plate to move in a vertical direction, and a main control channel is formed in the axial direction of the valve stem, and an annular groove is formed along the circumference of the valve stem, the annular groove being connected to the main control channel;

[0008] An upstream control channel, one end of which is connected to the upstream end of the water flow channel, and the other end is connected to the main control channel through an annular groove. A connecting pin is provided at the bottom end of the main control channel. Positive pressure is provided in the main control channel, and the connecting pin can be inserted into the gate plate;

[0009] The downstream control channel has one end connected to the downstream end of the water flow channel, and the other end can be connected to the main control channel through a pressure relief pilot valve and an annular groove. When the pressure at the downstream end of the water flow channel is greater than the threshold, the pressure relief pilot valve can block the main control channel. When the pressure at the downstream end of the water flow channel is less than the threshold, the positive pressure in the main control channel can be discharged from the pressure relief pilot valve, so that the connection is separated from the gate.

[0010] Furthermore, the valve stem extends vertically downward to form a guide section, a guide hole is opened in the middle of the gate plate, and when the connecting pin is inserted into the gate plate, the guide section is inserted into the guide hole; when the connecting pin is separated from the gate plate, the gate plate can move along the length direction of the guide section.

[0011] Furthermore, the pressure relief pilot valve is connected to the annular groove through a burst pipe emergency shut-off control channel.

[0012] Furthermore, a sealing sleeve is provided between the valve stem and the valve stem hole of the gate valve body, the sealing sleeve is wrapped around the annular groove, and the sealing sleeve is provided with through holes respectively connected to the upstream control channel and the pipe burst emergency shutdown control channel.

[0013] Furthermore, there is a height difference between the connection port of the upstream control channel and the main control channel and the connection port of the pipe burst emergency shutdown control channel and the main control channel, and the width of the annular groove is the same as the height difference.

[0014] Furthermore, the pipe burst emergency shutdown control channel is placed above the upstream control channel.

[0015] Furthermore, a receiving hole is opened on the gate plate, in which a pin return spring is built, and the pin return spring abuts against the end of the connecting pin.

[0016] Furthermore, the pressure relief pilot valve includes a reversing valve core and a pilot valve return spring, and the pilot valve return spring rests on the reversing valve core, so that the reversing valve core can block the downstream control channel, and when the water pressure in the downstream control channel is greater than a threshold value, the medium in the downstream control channel can push the reversing valve core to compress the pilot valve return spring.

[0017] Compared with the prior art, the gate valve with downstream pipe burst emergency shutoff function described in the present invention has the following advantages:

[0018] The utility model adopts an annular groove provided on the valve stem to connect the upstream control channel and the downstream control channel with the main control channel, so that the water pressure of the pressurized medium water in the upstream and downstream can make the connecting pin insert into the gate plate. At the same time, when a pipe burst occurs in the downstream and the pressure in the pipeline is reduced, the pressurized medium in the main control channel can be discharged from the pressure relief pilot valve, so that the gate plate blocks the water flow channel to prevent a large amount of water resources from leaking out.

[0019] The annular groove allows the main control channel to disconnect from the upstream control channel while connecting to the downstream control channel during vertical movement, thereby preventing the upstream medium water from leaking from the pressure relief pilot valve through the upstream control channel in the event of a pipe burst.

[0020] The guide section and the guide hole are matched so that the gate position can still be limited by the guide section after the gate is separated from the connecting pin, so as to prevent the gate from deviating and affecting the sealing effect in the emergency shutdown state, and at the same time facilitate the reconnection of the valve stem and the gate after downstream maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the gate valve in normal closed state;

[0023] Figure 2 for Figure 1 The enlarged schematic diagram of point B in the middle;

[0024] Figure 3 for Figure 1 A in the middle is an enlarged schematic diagram;

[0025] Figure 4 This is a schematic diagram of the gate valve when it is 60% open;

[0026] Figure 5 This is a schematic diagram of the gate valve when it is 80% open;

[0027] Figure 6 This is a schematic diagram of the gate valve closed state when a pipe burst occurs downstream.

[0028] Description of reference numerals:

[0029] 1- Gate valve body; 2- Water flow channel; 3- Gate disc; 4- Valve stem; 5- Upstream control channel; 6- Main control channel; 7- Ring groove; 8- Downstream control channel; 9- Pipe burst emergency shutdown control channel; 10- Connecting pin; 11- Pin return spring; 12- Accommodation hole; 13- Pressure relief pilot valve; 14- Reversing valve core; 15- Pressure relief port; 16- Pilot valve return spring; 17- Guide section; 18- Guide hole; 19- Sealing sleeve. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0032] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0034] The gate valve with downstream pipe burst emergency shut-off function described in the present invention comprises a gate valve body 1, which includes a water flow channel 2. The upstream end and the downstream end of the water supply of the urban pipeline are respectively connected to the water flow channel 2. The gate plate 3 is placed in the middle of the water flow channel 2. A valve stem 4 can drive the gate plate 3 to move in the vertical direction. The valve stem 4 is provided with a main control channel 6 along the axial direction. The valve stem 4 is provided with an annular groove 7 along the circumference. The annular groove 7 is connected to the main control channel 6 through a through hole. The main control channel 6 is provided with a through hole near one end of the gate plate 3. A connecting pin 1 is built into the through hole. 0, and a sealing ring is provided between the connecting pin 10 and the wall of the through hole. When positive pressure is provided in the main control channel 6, the positive pressure can push the connecting pin 10 outward. A receiving hole 12 is provided on the top of the gate plate 3. The connecting pin 10 can be inserted into the receiving hole 12, so that the valve stem 4 and the gate plate 3 are connected as a whole. A pin return spring 11 is also provided in the receiving hole 12. The pin return spring 11 is against the end of the connecting pin 10. When the connecting pin 10 extends outward, the pin return spring 11 can be compressed and deformed. A guide hole 18 is also provided on the top of the gate plate 3, and a guide section 17 is extended downward from the bottom end of the valve stem 4 along its own length. The guide section 17 is inserted into the guide hole 18. When the positive pressure in the main control channel 6 is lost, the pin return spring 11 can press the pin into the main control channel 6, so that the valve stem 4 and the gate plate 3 are separated. The gate plate 3 can fall along the length direction of the guide section 17 under the action of its own gravity, so that the water flow channel 2 is cut off, and at this time, the end of the guide section 17 is still inserted into the upper part of the guide hole 18, and the gate plate 3 is limited by the guide section 17.

[0035] The gate valve with downstream pipe burst emergency shut-off function described in the present invention also includes an upstream control channel 5, one end of which is connected with the upstream end of the water flow channel 2, and the other end is connected with the main control channel 6 through the annular groove 7. In order to prevent the medium water from leaking from the gap between the annular groove 7 and the valve stem 4 hole, a sealing sleeve 19 is provided between the valve stem 4 hole and the valve stem 4. The sealing sleeve 19 is surrounded by the outside of the annular groove 7, and the valve stem 4 can move along its own axial direction within the sealing sleeve 19. The medium water in the upstream end of the urban water supply can enter the annular groove 7 and the main control channel 6 of the valve stem 4 in turn through the upstream control channel 5, and the water pressure at the upstream end of the urban water supply causes the connecting pin 10 to be affected by positive pressure, extending outward and inserting into the gate plate 3, thereby connecting the valve stem 4 to the gate plate 3.

[0036] The gate valve with downstream pipe burst emergency shut-off function described in the present invention also includes a downstream control channel 8, one end of which is connected to the downstream end of the water flow channel 2, and the other end is connected to a pressure relief pilot valve 13, and the pressure relief pilot valve 13 is also connected to the annular groove 7 through the pipe burst emergency shut-off control channel 9, so that the medium water in the downstream end can enter the main control channel 6. Specifically, the pressure relief pilot valve 13 is provided with a pressure relief port 15, a pilot valve return spring 16 and a reversing valve core 14 in sequence along the axial direction, and the pilot valve return spring 16 is against the reversing valve core 14, so that the reversing valve core 14 can block the communication port between the downstream control channel 8 and the pressure relief pilot valve 13, and when the water pressure in the downstream control channel 8 When it is greater than the threshold, that is, when the water pressure in the downstream control channel 8 can compress and deform the pilot valve return spring 16, the reversing valve core 14 can move upward, first blocking the communication port between the pressure relief pilot valve 13 and the pipe burst emergency shutdown control channel 9, thereby preventing the positive pressure medium in the main control channel 6 from being discharged from the pressure relief port 15 of the pressure relief pilot valve 13, and preventing the pressure drop in the main control channel 6 from affecting the connecting pin 10. Then, as the reversing valve core 14 continues to rise, the reversing valve core 14 continues to move upward to block the pressure relief port 15, and at the same time connect the downstream control channel 8 with the pipe burst emergency control channel, thereby controlling the water pressure in the main control channel 6 by the downstream water pressure.

[0037] In the gate valve with downstream pipe burst emergency shutdown function described in the present invention, there is a height difference between the connecting port of the upstream control channel 5 and the main control channel 6 and the connecting port of the pipe burst emergency shutdown control channel 9 and the main control channel 6, and the width of the annular groove 7 is the same as the height difference. In a preferred embodiment, the pipe burst emergency shutdown control channel 9 is placed above the upstream control channel 5, so that during the axial movement of the valve stem 4, when the bottom end of the annular groove 7 moves to the connecting port of the upstream control channel 5, the top end of the annular groove 7 is connected with the pipe burst emergency shutdown control channel 9, and when the annular groove 7 continues to move upward, the upstream control channel 5 is disconnected from the annular groove 7, thereby preventing the water pressure at the upstream end from affecting the water pressure of the main control channel 6, so that the water pressure change in the downstream control channel 8 can timely affect the water pressure in the main control channel 6, thereby enabling the emergency shutdown function to respond in time.

[0038] The gate valve with downstream pipe burst emergency shut-off function described in the present invention, after installation, the water medium with a certain pressure in the upstream water supply end of the city can enter the main control channel 6 through the upstream control channel 5 and the annular groove 7 in sequence, so that the main control channel 6 has a positive pressure, and the connecting pin 10 extends outward and is inserted into the receiving hole 12 of the gate plate 3. During the normal opening process, the valve stem 4 drives the gate plate 3 to move upward, so that the water flow channel 2 is opened, and the water medium in the upstream end flows downstream, so that the water pressure at the downstream end gradually increases. In this embodiment, when the gate valve is opened to about 60%, the water pressure in the water medium at the downstream end reaches the threshold, so that the water medium flowing into the downstream control channel 8 can push the reversing valve core 14 to 3 and the main control channel 6 are connected. The connecting ports of the channels 5 are staggered, so that the upstream control channel 5 is disconnected from the main control channel 6, and the connecting pin 10 is pressured by the downstream medium water pressure until the gate valve is fully opened; when a pipe burst occurs downstream, the pressure of the water medium at the downstream end drops sharply, and the water flow velocity in the water flow channel 2 increases. Due to the principle of water flow injection, a low-pressure area is formed in the downstream control channel 8, so that the water in the downstream control channel 8 is discharged, and the reversing valve core 14 loses the influence of water pressure. Under the action of the pilot valve return spring 16, the reversing valve core 14 moves downward to block the downstream control channel 8, and at the same time, the pipe burst emergency shutdown control channel 9 is connected to the pressure relief port 15 of the pressure relief pilot valve 13, and the water medium in the main control channel 6 can pass The pressure is discharged from the pressure relief port, which reduces the pressure in the main control channel 6. After the connecting pin 10 loses water pressure, the pin return spring 11 pushes the connecting pin 10 into the main control channel 6, thereby separating the valve stem 4 and the gate plate 3. The gate plate 3 falls freely under the influence of its own weight, so that the water flow channel 2 is cut off, realizing the function of emergency shutdown of the downstream pipe burst, and eliminating the waste of a large amount of water resources. After the downstream pipe burst fault is handled, the control valve stem 4 drops to its initial position, so that the upstream water medium can enter the annular groove 7 and the main control channel 6 through the upstream control channel 5. The upstream water pressure causes the pin to extend outward and insert into the gate plate 3, restoring the function of emergency shutdown of the downstream pipe burst and the normal opening and closing function of the gate valve.

[0039] Optionally, in order to provide positive pressure in the main control channel 6, in addition to providing positive pressure through the water pressure of the medium water in the upstream, pressurized gas or liquid can be filled into the main control channel 6 during the production process, so that the main control channel 6 before the downstream pipe bursts maintains positive pressure, so as to control the connection between the connecting pin 10 and the gate plate 3 through positive pressure. When the pipe bursts downstream, the main control channel 6 is connected to the pressure relief port 15 of the pressure relief pilot valve 13, so that the pressurized gas or liquid in the main control channel 6 is discharged. After eliminating the safety hazards downstream, the gate valve or valve stem is replaced to restore the function of the gate valve at this node.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gate valve with a downstream pipe burst emergency shutoff function, characterized by: include A gate valve body (1) includes a water flow channel (2), a gate plate (3) disposed in the middle of the water flow channel (2), a valve stem (4) capable of driving the gate plate (3) to move in a vertical direction, and a main control channel (6) is formed in the axial direction of the valve stem (4), and an annular groove (7) is formed around the valve stem (4), and the annular groove (7) is communicated with the main control channel (6); An upstream control channel (5) has one end in communication with the upstream end of the water flow channel (2), and the other end in communication with the main control channel (6) via an annular groove (7). A connecting pin (10) is provided at the bottom end of the main control channel (6). Positive pressure is provided in the main control channel (6), and the connecting pin (10) can be inserted into the gate plate (3); The downstream control channel (8) has one end in communication with the downstream end of the water flow channel (2), and the other end in communication with the main control channel (6) through a pressure relief pilot valve (13) and an annular groove (7). When the pressure at the downstream end of the water flow channel (2) is greater than a threshold value, the pressure relief pilot valve (13) can block the main control channel (6). When the pressure at the downstream end of the water flow channel (2) is less than the threshold value, the positive pressure in the main control channel (6) can be discharged from the pressure relief pilot valve (13), so that the connection is separated from the gate plate (3).

2. A gate valve with a downstream pipe burst emergency shutoff function according to claim 1, characterized in that: The valve stem (4) extends vertically downward to form a guide section (17), and a guide hole (18) is opened in the middle of the gate plate (3). When the connecting pin (10) is inserted into the gate plate (3), the guide section (17) is inserted into the guide hole (18); when the connecting pin (10) is separated from the gate plate (3), the gate plate (3) can move along the length direction of the guide section (17).

3. The gate valve with downstream pipe burst emergency shutoff function according to claim 1, characterized in that: The pressure relief pilot valve (13) is communicated with the annular groove (7) via a burst pipe emergency shutoff control channel (9).

4. The gate valve with downstream pipe burst emergency shutoff function according to claim 3, characterized in that: A sealing sleeve (19) is provided between the valve stem (4) and the valve stem (4) hole of the gate valve body (1), the sealing sleeve (19) being wrapped around the outside of the annular groove (7), and the sealing sleeve (19) is provided with through holes respectively connected to the upstream control channel (5) and the pipe burst emergency shutdown control channel (9).

5. The gate valve with downstream pipe burst emergency shutoff function according to claim 3, characterized in that: There is a height difference between the connection port of the upstream control channel (5) and the main control channel (6) and the connection port of the burst pipe emergency shutdown control channel (9) and the main control channel (6), and the width of the annular groove (7) is the same as the height difference.

6. The gate valve with downstream pipe burst emergency shutoff function according to claim 5, characterized in that: The pipe burst emergency shut-off control channel (9) is placed above the upstream control channel (5).

7. The gate valve with downstream pipe burst emergency shutoff function according to claim 1, characterized in that: The gate plate (3) is provided with a receiving hole (12) in which a pin return spring (11) is built. The pin return spring (11) abuts against the end of the connecting pin (10).

8. The gate valve with downstream pipe burst emergency shutoff function according to claim 1, characterized in that: The pressure relief pilot valve (13) comprises a reversing valve core (14) and a pilot valve return spring (16), and the pilot valve return spring (16) abuts against the reversing valve core (14), so that the reversing valve core (14) can block the downstream control channel (8), and when the water pressure in the downstream control channel (8) is greater than a threshold value, the medium in the downstream control channel (8) can push the reversing valve core (14) to compress the pilot valve return spring (16).

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