Stop valve with downstream pipe burst emergency shutoff function

Abstract

The utility model provides a stop valve with a downstream pipe burst emergency shut-off function, which comprises a valve clack, an urban water supply upstream end and an urban water supply downstream end, each of which comprises an arc-shaped section, and the valve clack can block the communication part of the two arc-shaped sections when located at a lower limit position; the valve rod is provided with a main control channel in the length direction. A pressure relief guide valve is arranged between the main control channel and the urban water supply downstream end, a valve element of the pressure relief guide valve can block a communicating port of the main control channel and the pressure relief guide valve, or the main control channel is communicated with a pressure relief port of the pressure relief guide valve, and therefore the bottom end of the main control channel is connected with or separated from the valve clack through a connecting pin. And a pressure spring can enable the valve clack to block the stop valve. Under the condition of pipe explosion, the pressure relief pilot valve controls the positive pressure in the main control channel to change due to the change of water pressure, so that the relationship between the connecting pin and the valve clack is controlled, the state of the pressure relief pilot valve during pipe explosion is changed, the stop valve is blocked by the valve clack through the pressure spring, and a large amount of water resources are prevented from being wasted.

Description

Technical Field

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

[0002] In urban water supply systems, stop valves are used in urban water supply, building water supply, and cold and cooling water systems to control and cut off the flow of hot and cold water. 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 stop valves.

[0003] In the existing application process of stop valves, they are usually in the normally open state. When encountering an emergency leakage and large-scale water discharge downstream, the stop valve located upstream cannot detect the emergency downstream in time, and therefore cannot get timely feedback and automatically close. Continuing water supply is likely to cause a large amount of water and heat resources to be wasted. Therefore, how to shut off the stop valve in time when facing an emergency leakage downstream is also an urgent problem to be solved. Utility Model Content

[0004] In view of this, the utility model aims to provide a stop valve with a downstream pipe burst emergency shut-off function, so that the valve body can be closed in time when an emergency leakage occurs in the downstream.

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

[0006] A stop valve with a downstream pipe burst emergency shut-off function, comprising

[0007] The stop valve body includes a city water supply upstream end, a city water supply downstream end, and a valve disc. The city water supply upstream end and the city water supply downstream end each include an arc segment, and one end of the two arc segments is opened with a corresponding direction. The valve disc is located at the connection between the two arc segments and can block the connection between the two arc segments when the valve disc is in the lower limit position.

[0008] The valve stem has a main control channel along its length. Two connecting pins are provided at the bottom end of the valve stem. When the pressure in the main control channel is greater than a threshold, the connecting pins can be inserted into the valve disc. When the pressure in the main control channel is less than the threshold, the connecting pins are separated from the valve disc.

[0009] The main control channel is connected to the downstream end of the city water supply, and a pressure relief pilot valve is provided between the main control channel and the downstream end of the city water supply. When the pressure in the downstream end of the city water supply is greater than a threshold value, the valve core of the pressure relief pilot valve can block the communication port between the main control channel and the pressure relief pilot valve. When the pressure in the downstream end of the city water supply is less than the threshold value, the main control channel is connected to the pressure relief port of the pressure relief pilot valve, and at this time the connecting pin is separated from the valve disc.

[0010] A compression spring is provided between the top of the downstream end of the city water supply and the valve disc. When the connecting pin is separated from the valve stem, the compression spring can press the valve disc toward the connecting point of the two arc sections.

[0011] Furthermore, the valve disc has a guide hole along the length of the valve stem, and when the connecting pin is separated from the valve disc and the valve plate blocks the connection between the two arc sections, the bottom end of the valve stem can be placed at the orifice of the guide hole.

[0012] Furthermore, the compression spring is sleeved on the valve stem.

[0013] Furthermore, the valve disc is provided with a table surface along its circumference, and one end of the compression spring rests on the table surface of the valve disc.

[0014] Furthermore, the stop valve also includes an upstream control channel, one end of which is connected to the upstream end of the city water supply, and the other end is connected to the main control channel.

[0015] Furthermore, the pressure relief pilot valve is connected to the main control channel through a burst pipe emergency shut-off control channel.

[0016] Furthermore, an annular groove is opened along the outer side of the valve stem, and the annular groove is connected to the main control channel through a through hole. When the annular groove moves axially along the valve stem, it can be connected to the upstream control channel or the pipe burst emergency shutdown control channel respectively.

[0017] 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.

[0018] Furthermore, a receiving hole is opened on the valve disc, in which a pin return spring is built, and the pin return spring abuts against the end of the connecting pin.

[0019] Compared with the prior art, the stop valve with downstream pipe burst emergency shut-off function described in the present invention has the following advantages:

[0020] The utility model uses the water pressure change in the downstream pipeline in the event of a pipe burst to enable the pressure relief pilot valve to control whether there is positive pressure in the main control channel, thereby controlling whether the connecting pin is connected to the valve disc, so that when a pipe burst occurs downstream, the state of the pressure relief pilot valve can be changed in time, and the valve disc is sealed between the upstream end and the downstream end of the urban water supply by the compression spring, thereby preventing a large amount of water resources from being wasted;

[0021] The upstream control channel enables the stop valve to complete the connection between the valve stem and the valve disc through the upstream water pressure after the downstream pipe burst is repaired, so that the stop valve can be restored to service in time;

[0022] An annular groove is provided on the valve stem, and while the annular groove is connected to the pipe burst emergency shutdown control channel, it is disconnected from the upstream control channel to prevent the water medium at the upstream end of the city water supply from being discharged from the pressure relief port of the pressure relief valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] Figure 1 This is a structural diagram of the stop valve in a normally closed state;

[0025] Figure 2 for Figure 1 The enlarged schematic diagram of point B in the middle;

[0026] Figure 3 for Figure 1 A in the middle is an enlarged schematic diagram;

[0027] Figure 4 This is a schematic diagram of the stop valve opening 60%;

[0028] Figure 5 This is a schematic diagram of the stop valve opening 70%;

[0029] Figure 6 This is a schematic diagram of the emergency closing state of the stop valve when the downstream pipe bursts.

[0030] Description of reference numerals:

[0031] 1-stop valve body; 2-upstream end of urban water supply; 3-downstream end of urban water supply; 4-arc section; 5-valve disc; 6-table; 7-guide hole; 8-accommodation hole; 9-pin return spring; 10-valve stem; 12-compression spring; 13-main control channel; 14-ring groove; 15-connecting pin; 16-upstream control channel; 17-burst pipe emergency shutdown control channel; 18-downstream control channel; 19-pressure relief pilot valve; 20-pressure relief port; 21-pilot valve return spring; 22-reversing valve core. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0036] The stop valve with downstream pipe burst emergency shut-off function described in the present invention comprises a stop valve body 1, which includes a city water supply upstream end 2, a city water supply downstream end 3 and a valve disc 5, wherein the city water supply upstream end 2 and the city water supply downstream end 3 respectively include an arc segment 4, and one end of the two arc segments 4 is connected, and the inner side of the connected end extends inwardly to form a ring platform, and the inner hole of the ring platform is provided with a sealing ring, and the valve disc 5 is placed just above the ring platform. The valve disc 5 can move along its own axial direction, and when the valve disc 5 moves downward to the limit position, the valve disc 5 is placed at the connection between the two arc segments 4 and abuts against the sealing ring of the ring platform, so that the city water supply upstream end 2 and the city water supply downstream end 3 are disconnected; the valve disc 5 is controlled by the valve stem 10 Movement, the valve plate is provided with a main control channel 13 along its own length direction, and the bottom end of the valve stem 10 is provided with a through hole connected to the main control channel 13 in the radial direction, and a connecting pin 15 is provided in the through hole, and a sealing ring is provided between the connecting pin 15 and the hole wall of the through hole. When positive pressure is provided in the main control channel 13, the positive pressure can push the connecting pin 15 outward, and a receiving hole 8 is provided on the top of the valve disc 5, and the connecting pin 15 can be inserted into the receiving hole 8, so that the valve stem 10 and the valve disc 5 are connected as a whole. A pin reset spring 9 is also provided in the receiving hole 8, and the pin reset spring 9 is against the end of the connecting pin 15. When the connecting pin 15 extends outward, the pin reset spring 9 can be compressed and deformed. A guide hole 7 is also provided on the top of the valve disc 5, and the bottom end of the valve stem 10 is inserted into the guide hole 7. When the positive pressure in the main control channel 13 is lost, the pin return spring 9 can press the pin into the main control channel 13, so that the valve stem 10 and the valve disc 5 are separated. When the connecting pin 15 is separated from the valve disc 5 and the valve plate blocks the connection between the two arc sections 4, the bottom end of the valve stem 10 can be placed at the orifice of the guide hole 7. The compression spring 12 is sleeved on the valve stem 10, and the valve disc 5 is provided with a table 6 along the circumference. One end of the compression spring 12 rests on the table 6 of the valve disc 5, and the other end rests on the arc top of the arc section 4 of the downstream end 3 of the urban water supply. More specifically, in this embodiment, a cavity is opened at the arc top of the arc section 4 of the downstream end 3 of the urban water supply, and the compression spring 12 rests on the top of the cavity. When the valve disc 5 moves upward to the limit position, it can be placed in the cavity. During operation, this structure provides a limiting effect on the compression spring 12 through the valve stem 10, and cooperates with the bottom end of the valve stem 10 through the guide hole 7 of the valve disc 5 to prevent the valve disc 5 from moving vertically downward after being separated from the connecting pin 15, thereby preventing the valve disc 5 from deviating and causing the loss of positive pressure in the main control pipeline, causing the valve disc 5 to move downward and deviate, resulting in water leakage in the stop valve.

[0037] The stop valve with a downstream pipe burst emergency shut-off function described in the present invention also includes an upstream control channel 165. An annular groove 14 is formed on the valve stem 10, and the annular groove 14 is connected to the main control channel 13 through a through hole. One end of the upstream control channel 16 is connected to the upstream end of the water flow channel, and the other end is connected to the main control channel 13 through the annular groove 14. In order to prevent the medium water from leaking from the gap between the annular groove 14 and the hole of the valve stem 10, a sealing sleeve is provided between the hole of the valve stem 10 and the valve stem 10. The sealing sleeve is surrounded by the outside of the annular groove 14, and the valve stem 10 can move along its own axial direction in the sealing sleeve. The medium water in the upstream end 2 of the urban water supply can enter the annular groove 14 and the main control channel 13 of the valve stem 10 in turn through the upstream control channel 16, and the water pressure at the upstream end 2 of the urban water supply causes the connecting pin 15 to be affected by positive pressure, extending outward and inserting into the valve disc 5, thereby connecting the valve stem 10 to the valve disc 5.

[0038] The stop valve with downstream pipe burst emergency shut-off function described in the present invention also includes a downstream control channel 18, one end of which is connected to the downstream end of the water flow channel, and the other end is connected to a pressure relief pilot valve 19. The pressure relief pilot valve 19 is also connected to the annular groove 14 through the pipe burst emergency shut-off control channel 17, so that the medium water in the downstream end can enter the main control channel 13. Specifically, the pressure relief pilot valve 19 is provided with a pressure relief port 20, a pilot valve return spring 21 and a reversing valve core 22 in sequence along the axial direction, and the pilot valve return spring 21 is against the reversing valve core 22, so that the reversing valve core 22 can block the communication port between the downstream control channel 18 and the pressure relief pilot valve 19, and when the water pressure in the downstream control channel 18 is When it is greater than the threshold value, that is, when the water pressure in the downstream control channel 18 can compress and deform the pilot valve return spring 21, the reversing valve core 22 can move upward, first blocking the communication port between the pressure relief pilot valve 19 and the pipe burst emergency shutdown control channel 17, thereby preventing the positive pressure medium in the main control channel 13 from being discharged from the pressure relief port 20 of the pressure relief pilot valve 19, and preventing the pressure reduction in the main control channel 13 from affecting the connecting pin 15. Then, as the reversing valve core 22 continues to rise, the reversing valve core 22 continues to move upward to block the pressure relief port 20, and at the same time connect the downstream control channel 18 with the pipe burst emergency control channel, thereby controlling the water pressure in the main control channel 13 by the downstream water pressure.

[0039] In the stop valve with a downstream pipe burst emergency shut-off function described in the present invention, there is a height difference between the connecting port of the upstream control channel 16 and the main control channel 13 and the connecting port of the pipe burst emergency shut-off control channel 17 and the main control channel 13, and the width of the annular groove 14 is the same as the height difference. In a preferred embodiment, the pipe burst emergency shut-off control channel 17 is placed above the upstream control channel 16, so that during the axial movement of the valve stem 10, when the bottom end of the annular groove 14 moves to the connecting port of the upstream control channel 16, the top end of the annular groove 14 is connected to the pipe burst emergency shut-off control channel 17, and when the annular groove 14 continues to move upward, the upstream control channel 16 is disconnected from the annular groove 14, thereby preventing the water pressure at the upstream end from affecting the water pressure in the main control channel 13, so that the water pressure change in the downstream control channel 18 can timely affect the water pressure in the main control channel 13, thereby enabling the emergency shut-off function to respond in time.

[0040] The stop 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 end 2 of the city water supply can enter the main control channel 13 through the upstream control channel 16 and the annular groove 14 in sequence, so that there is a positive pressure in the main control channel 13, and the connecting pin 15 extends outward and is inserted into the accommodating hole 8 of the valve disc 5. During the normal opening process, the valve stem 10 drives the valve disc 5 to move upward, so that the water flow channel 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 stop 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 18 can push the reversing valve core 22 to move upward, blocking the burst The pipe emergency shut-off control channel 17 is connected with the pressure relief pilot valve 19. As the pressure of the downstream water medium continues to rise, the reversing pilot valve continues to move upward, so that the pipe burst emergency shut-off control channel 17 is connected with the downstream control channel 18. At this time, the pressure of the water medium in the downstream end acts on the connecting pin 15 through the downstream control channel 18, the pipe burst emergency shut-off control channel 17, the annular groove 14, and the main control channel 13 in sequence, so that the connecting pin 15 continues to be inserted into the accommodating hole 8 of the valve disc 5 to prevent the valve stem 10 and the valve disc 5 from separating. The actuator of the stop valve can control the valve stem 10 to drive the valve disc 5 to continue to move forward, so that the valve is opened. When the stop valve is opened to about 70%, the annular groove 14 and the connecting port of the upstream control channel 16 are staggered. The upstream control channel 16 is disconnected from the main control channel 13, and the downstream medium water pressure provides pressure to the connecting pin 15 until the stop 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 increases. Due to the principle of water flow injection, a low-pressure area is formed in the downstream control channel 18, so that the water in the downstream control channel 18 is discharged, and the reversing valve core 22 loses the influence of water pressure. Under the action of the pilot valve return spring 21, the reversing valve core 22 moves downward to block the downstream control channel 18, and at the same time, the pipe burst emergency shutdown control channel 17 is connected to the pressure relief port 20 of the pressure relief pilot valve 19, and the water medium in the main control channel 13 can be discharged through the pressure relief port, so that the main control channel 1 3 decreases, and after the connecting pin 15 loses water pressure, the pin return spring 9 pushes the connecting pin 15 into the main control channel 13, thereby separating the valve stem 10 and the valve disc 5. The valve disc 5 falls down under the action of the compression spring 12 and rests on the sealing ring, blocking the connection port of the two arc segments 4, so that the water flow channel 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 10 drops to the initial position, so that the upstream water medium can enter the annular groove 14 and the main control channel 13 through the upstream control channel 16. The connecting pin 15 is extended outward by the upstream water pressure and inserted into the valve disc 5, restoring the function of emergency shutdown of the downstream pipe burst and the normal opening and closing function of the stop valve.

[0041] 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 stop valve with a downstream pipe burst emergency shutoff function, characterized by: The invention comprises a stop valve body (1), which comprises a city water supply upstream end (2), a city water supply downstream end (3) and a valve flap (5); the city water supply upstream end (2) and the city water supply downstream end (3) respectively comprise arc segments (4), and one end of the two arc segments (4) is connected; the valve flap (5) is placed at the connection between the two arc segments (4), and when the valve flap (5) is in the lower limit position, it can block the connection between the two arc segments (4); The valve stem (10) has a main control channel (13) along its length. Two connecting pins (15) are provided at the bottom end of the valve stem (10). When the pressure in the main control channel (13) is greater than a threshold value, the connecting pins (15) can be inserted into the valve disc (5). When the pressure in the main control channel (13) is less than the threshold value, the connecting pins (15) are separated from the valve disc (5). The main control channel (13) is connected to the downstream end (3) of the city water supply, and a pressure relief pilot valve (19) is provided between the main control channel (13) and the downstream end (3) of the city water supply. When the pressure in the downstream end (3) of the city water supply is greater than a threshold value, the valve core of the pressure relief pilot valve (19) can block the communication port between the main control channel (13) and the pressure relief pilot valve (19). When the pressure in the downstream end (3) of the city water supply is less than the threshold value, the main control channel (13) is connected to the pressure relief port (20) of the pressure relief pilot valve (19), and at this time, the connecting pin (15) is separated from the valve disc (5); A compression spring (12) is provided between the top of the downstream end (3) of the city water supply and the valve disc (5). When the connecting pin (15) is separated from the valve stem (10), the compression spring (12) can press the valve disc (5) toward the connecting point of the two arc sections (4).

2. A stop valve with a downstream pipe burst emergency shutoff function according to claim 1, characterized in that: The valve disc (5) is provided with a guide hole (7) along the length direction of the valve stem (10), and when the connecting pin (15) is separated from the valve disc (5) and the valve plate blocks the connection between the two arc sections (4), the bottom end of the valve stem (10) can be placed at the opening of the guide hole (7).

3. A stop valve with a downstream pipe burst emergency shutoff function according to claim 1 or 2, characterized in that: The compression spring (12) is sleeved on the valve stem (10).

4. A stop valve with a downstream pipe burst emergency shutoff function according to claim 3, characterized in that: The valve flap (5) is provided with a table surface (6) along its circumference, and one end of the compression spring (12) abuts against the table surface (6) of the valve flap (5).

5. The stop valve with downstream pipe burst emergency shutoff function according to claim 3, characterized in that: It also includes an upstream control channel (16), one end of which is connected to the upstream end (2) of the city water supply, and the other end of which is connected to the main control channel (13).

6. The stop valve with downstream pipe burst emergency shutoff function according to claim 5, characterized in that: The pressure relief pilot valve (19) is communicated with the main control channel (13) via a burst pipe emergency shut-off control channel (17).

7. The stop valve with downstream pipe burst emergency shutoff function according to claim 6, characterized in that: An annular groove (14) is formed along the outer side of the valve stem (10), and the annular groove (14) is connected to the main control channel (13) through a through hole. When the annular groove (14) moves axially along the valve stem (10), it can be connected to the upstream control channel (16) or the pipe burst emergency shutdown control channel (17).

8. The stop valve with downstream pipe burst emergency shutoff function according to claim 1, characterized in that: The pressure relief pilot valve (19) comprises a reversing valve core (22) and a pilot valve return spring (21), and the pilot valve return spring (21) abuts against the reversing valve core (22), so that the reversing valve core (22) can block the downstream control channel (18), and when the water pressure in the downstream control channel (18) is greater than a threshold value, the medium in the downstream control channel (18) can push the reversing valve core (22) to compress the pilot valve return spring (21).

9. The stop valve with downstream pipe burst emergency shutoff function according to claim 1, characterized in that: The valve flap (5) is provided with a receiving hole (8) in which a pin return spring (9) is built, and the pin return spring (9) abuts against the end of the connecting pin (15).

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