Anti-freezing stop valve for low-temperature environment

Abstract

The invention discloses an anti-freezing stop valve for a low-temperature environment, and relates to the technical field of stop valves. The stop valve comprises a stop valve body, a heating assembly is arranged outside the stop valve body, an anti-freezing device is arranged at the bottom of the stop valve body, and the anti-freezing device comprises a U-shaped frame fixed to the bottom of the stop valve body. Through the arrangement of the anti-freezing device, residual water in the stop valve main body can be discharged through the drainage pipe, so that the problem that the stop valve main body is frozen or damaged due to the fact that water remains in the stop valve main body and the water is frozen in cold weather is solved, meanwhile, the T-shaped plug rod extracts air between the semicircular bag and the hollow plug column, and the anti-freezing effect of the stop valve is improved. The semicircular bag is sunken and deformed, so that the semicircular bag is separated from ice in the stop valve body, and it is guaranteed that under the condition that the hollow plugging column and the semicircular bag are frozen, the sliding plate does not bear resistance when driving the hollow plugging column to move out of the drainage pipe.

Description

Technical Field

[0001] This invention relates to the field of gate valve technology, specifically to an antifreeze gate valve for low-temperature environments. Background Technology

[0002] A gate valve is a type of valve used to control fluid flow. It opens or closes by rotating the valve stem, thereby regulating the flow rate. Commonly used in piping systems, gate valves effectively cut off or regulate fluid flow and offer advantages such as good sealing performance and simple operation. They are typically used for pipeline control of media such as water, oil, and gas.

[0003] Chinese patent publication number CN216306861U discloses a stop valve with an anti-freeze-crack structure, including a flange and a filter assembly. A threaded rod is installed at the center of the top of the flange, and a temperature control assembly for temperature control of the stop valve is installed on the center of the outer wall of the threaded rod. The temperature control assembly includes a fixed sleeve, a temperature control panel, a temperature guide plate, a heating wire, and a receiving rod. The temperature control panel is installed on the outer wall of the front end of the fixed sleeve. Receiving rods are welded to both ends of the inner wall of the fixed sleeve, and a heating wire is installed at the end of the receiving rod. A temperature guide plate is installed at the end of the heating wire. A main shell is located at the bottom of the flange. This stop valve with an anti-freeze-crack structure places the temperature guide plate and heating wire on the left and right ends of the inner wall of the fixed sleeve, respectively. The heating wire provides heating, while the temperature guide plate transfers heat from the heating wire to the outer wall of the threaded rod, preventing the threaded rod from freezing to the rotating disc due to low temperature, thus ensuring the normal operation of the device.

[0004] However, the current gate valve has the following problems: the ambient temperature of the gate valve is too low, especially in winter. If water is not drained from the gate valve, when the ambient temperature drops below freezing point, the water will freeze and increase in volume, which will put pressure on the gate valve and easily cause the gate valve to freeze and crack. Therefore, we have proposed an antifreeze gate valve for low temperature environments. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an antifreeze shut-off valve for low-temperature environments, solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a low-temperature environment antifreeze shut-off valve, comprising a shut-off valve body, a heating assembly disposed on the outside of the shut-off valve body, the heating assembly comprising an insulation shell, the insulation shell being fixed to the outside of the shut-off valve body, a heater body embedded in the outer wall of the insulation shell, heating tubes fixed on both sides of the heater body, and the heating tubes being disposed inside the insulation shell, an antifreeze device disposed at the bottom of the shut-off valve body, the antifreeze device comprising a U-shaped frame fixed to the bottom of the shut-off valve body, two drain pipes respectively fixed on both sides of the bottom of the shut-off valve body, a screw rotatably mounted inside the U-shaped frame, a sliding plate threaded to the outside of the screw, the sliding plate being slidably mounted inside the U-shaped frame, hollow plugs penetrating and fixed on both sides of the top of the sliding plate, a semi-circular bladder fixed to the top of the hollow plug, a T-shaped stopper slidably mounted inside the hollow plug, a spring disposed between the T-shaped stopper and the bottom of the sliding plate, and a restraint mechanism for the T-shaped stopper being disposed at the bottom of the sliding plate. A limiting assembly for the position of the stopper rod includes an elastic telescopic rod. The fixed end of the elastic telescopic rod is fixed to the bottom of the slide plate, and the telescopic end of the elastic telescopic rod is fixed with an F-shaped locking plate. The notch of the F-shaped locking plate engages with the lower outer wall of the T-shaped stopper rod. The screw drives the slide plate to move downwards along the inside of the U-shaped frame. The slide plate drives the hollow plug rod to move downwards as well. The hollow plug rod moves out of the drain pipe, and at this time, the water remaining inside the shut-off valve body will be discharged through the drain pipe, even if the inside of the shut-off valve body is frozen. Because the ice freezes the hollow plug and the semi-circular bladder to the main body of the shut-off valve, the screw-driven sliding plate will encounter resistance when it moves downward. The semi-circular bladder is in contact with the ice inside the shut-off valve body, pushing the F-shaped clamping plate towards the elastic telescopic rod. The F-shaped clamping plate squeezes the telescopic end of the elastic telescopic rod, and the F-shaped clamping plate no longer jams the T-shaped stopper rod, pulling the T-shaped stopper rod downward. The T-shaped stopper rod draws out the air between the semi-circular bladder and the hollow plug, causing the semi-circular bladder to deform and thus detach from the ice inside the shut-off valve body.

[0007] According to the above technical solution, a water storage column is fixed through and fixed to the bottom of the T-shaped plug rod, and an expansion bladder is fixed to the bottom of the water storage column. The top of the water storage column is in contact with the top of the inner wall of the semi-circular bladder. Both the water storage column and the expansion bladder are filled with water. After the water inside the shut-off valve body freezes, the water inside the water storage column and the expansion bladder will also freeze when they get cold. After the water inside the water storage column and the expansion bladder freezes, their volume will expand. At this time, the expansion bladder will bulge. The operator can determine whether the water inside the shut-off valve body has frozen by observing the volume change of the expansion bladder.

[0008] According to the above technical solution, both the hollow plug column and the T-shaped plug rod are made of heat-insulating material. The bottom of the T-shaped plug rod is fixed with a double-layer heat-insulating glass cover. It should be noted that the heat-insulating materials of the hollow plug column, the T-shaped plug rod, and the double-layer heat-insulating glass cover form a heat-insulating protection around the water storage column and the expansion bladder.

[0009] According to the above technical solution, a scraper device is provided inside the gate valve body. The scraper device includes two fixed shells, two toothed rings, and two rotating rings. The two fixed shells are respectively fixed to both sides of the outer wall of the gate valve body. A rotating rod is rotatably installed through the two fixed shells. Gears are fixed at both ends of the rotating rod, and the gears are located inside the fixed shells. The two toothed rings and the two rotating rings are rotatably installed on both sides inside the gate valve body. The two toothed rings are located on the side of the gate valve body away from the center, and the two rotating rings are located on the side of the gate valve body closer to the center. The inner walls of the toothed rings and the rotating rings are connected. Several U-shaped rods are fixed between the valve body and the drain pipe. Scraper blades are fixed on both sides of the U-shaped rods near the inner wall of the valve body. The scraper blades are in contact with the inner wall of the valve body and are arranged in a figure-eight shape with a 10-centimeter gap between them. The drain pipe is located between the two scraper blades. Each time the drain pipe drains water from inside the valve body, the rotating rod is rotated. The rotating rod drives the gear to rotate, the gear drives the gear ring to rotate, the gear ring drives the U-shaped rod to rotate, and the U-shaped rod drives the scraper blades to rotate. The two scraper blades in a figure-eight shape scrape the remaining water inside the valve body towards the drain pipe.

[0010] This invention provides an antifreeze shut-off valve for low-temperature environments. It has the following beneficial effects: (1) By setting up an antifreeze device, the screw, slide plate, and U-shaped frame work together to move the hollow plug column out of the drain pipe. The water remaining inside the gate valve body will be discharged through the drain pipe, thereby avoiding the problem of water remaining inside the gate valve body and freezing in cold weather, which would cause the gate valve body to freeze or be damaged. At the same time, the gate valve body, hollow plug column, semi-circular bladder, screw, slide plate, F-shaped clamping plate, and elastic telescopic rod work together to allow the T-shaped plug rod to draw out the air between the semi-circular bladder and the hollow plug column. The semi-circular bladder is concave and deformed, thereby allowing the semi-circular bladder to detach from the ice inside the gate valve body. This ensures that when the hollow plug column and semi-circular bladder are frozen, the slide plate will not encounter resistance when moving the hollow plug column out of the drain pipe.

[0011] (2) The present invention, through the setting of water storage column and expansion bladder, makes the water inside the water storage column and expansion bladder freeze when it gets cold. After the water inside the water storage column and expansion bladder freezes, the volume will expand. At this time, the expansion bladder will bulge. The staff can judge whether the inside of the shut-off valve body has frozen by observing the volume change of the expansion bladder. Through the setting of the heat insulation material of the hollow plug column, the heat insulation material of the T-shaped plug rod and the double-layer heat insulation glass cover, the hollow plug column, the T-shaped plug rod and the double-layer heat insulation glass cover form heat insulation protection on the outside of the water storage column and expansion bladder, thereby avoiding the water inside the water storage column and expansion bladder from freezing due to the external temperature caused by exposure to the external environment. This ensures that the water in the water storage column and expansion bladder will only freeze due to the internal temperature of the shut-off valve body.

[0012] (3) By setting up a scraper device, the drain pipe, the gate valve body, the gear, the gear ring, and the U-shaped rod work together to drive the scraper blades to rotate. The two scraper blades, which are in the shape of an "eight", scrape the water remaining inside the gate valve body towards the drain pipe, thereby improving the efficiency of draining the water remaining inside the gate valve body. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the entire invention. Figure 1 ; Figure 2 This is a schematic diagram of the entire invention. Figure 2 ; Figure 3 This is a partial cross-sectional view of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the heating assembly of the present invention; Figure 5 This is a partial cross-sectional view of the present invention. Figure 2 ; Figure 6 This is a partial cross-sectional schematic diagram of the antifreeze device of the present invention; Figure 7 For the present invention Figure 6 An enlarged schematic diagram of the structure at point A (the drainage pipe and the hollow plug are shown in an exploded view in this diagram). Figure 8 This is a partial cross-sectional schematic diagram of the antifreeze device of the present invention; Figure 9 This is a schematic diagram of the wiping device of the present invention.

[0014] In the diagram: 1. Gate valve body; 2. Heating assembly; 21. Insulation shell; 22. Heater body; 23. Heating tube; 3. Antifreeze device; 31. U-shaped frame; 32. Screw; 33. Slide plate; 34. Hollow plug column; 35. Semi-circular bladder; 36. Drain pipe; 37. T-shaped plug rod; 38. Elastic telescopic rod; 39. F-shaped clamping plate; 310. Water storage column; 311. Expansion bladder; 312. Double-layered insulated glass cover; 4. Squeegee device; 41. Fixed shell; 42. Rotating rod; 43. Gear; 44. Gear ring; 45. U-shaped rod; 46. Squeegee blade; 47. Rotating ring. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0016] Please see Figures 1-9This invention provides a technical solution: a freeze-proof shut-off valve for low-temperature environments, comprising a shut-off valve body 1, a heating assembly 2 disposed on the outside of the shut-off valve body 1, the heating assembly 2 including a heat insulation shell 21 fixed to the outside of the shut-off valve body 1, a heater body 22 embedded in the outer wall of the heat insulation shell 21, heating tubes 23 fixed on both sides of the heater body 22, and the heating tubes 23 disposed inside the heat insulation shell 21, and a freeze-proof device 3 disposed at the bottom of the shut-off valve body 1, the freeze-proof device 3 including a valve body fixed to the shut-off valve body 1, the heater body 1 being a valve ... The valve body 1 has a U-shaped frame 31 at its bottom and two drain pipes 36 fixed to both sides of the bottom. A screw 32 is rotatably mounted inside the U-shaped frame 31, and a sliding plate 33 is threaded onto the outside of the screw 32. The sliding plate 33 is slidably mounted inside the U-shaped frame 31. Hollow plugs 34 are fixed through and fixed to both sides of the top of the sliding plate 33. This structure allows the hollow plugs 34 to be moved out of the drain pipes 36, allowing residual water inside the valve body 1 to drain through the drain pipes 36, thus preventing water from entering the valve body 1. Water residue remains in the valve body, and this water freezes in cold weather, causing the valve body 1 to freeze or become damaged. A semi-circular bladder 35 is fixed to the top of the hollow plug 34. A T-shaped stopper 37 is slidably installed inside the hollow plug 34. A spring is provided between the T-shaped stopper 37 and the bottom of the slide plate 33. A limiting component for restricting the position of the T-shaped stopper 37 is provided at the bottom of the slide plate 33. The limiting component includes an elastic telescopic rod 38. The fixed end of the elastic telescopic rod 38 is fixed to the bottom of the slide plate 33, and the telescopic end of the elastic telescopic rod 38 is fixed with… The F-shaped clamp 39 has a notch that engages with the lower outer wall of the T-shaped stopper rod 37. When the inside of the shut-off valve body 1 is frozen, the above structure allows the T-shaped stopper rod 37 to draw air from between the semi-circular bladder 35 and the hollow plug 34. The semi-circular bladder 35 deforms and detaches from the ice inside the shut-off valve body 1. This ensures that when the hollow plug 34 and the semi-circular bladder 35 are frozen, the sliding plate 33 will not encounter resistance when it moves the hollow plug 34 out of the drain pipe 36.

[0017] The bottom of the T-shaped stopper 37 is penetrated and fixed with a water storage column 310. The bottom of the water storage column 310 is fixed with an expansion bladder 311. The top of the water storage column 310 is in contact with the top of the inner wall of the semi-circular bladder 35. Both the water storage column 310 and the expansion bladder 311 are filled with water. With the above structure, the volume of the water inside the water storage column 310 and the expansion bladder 311 will expand after freezing. At this time, the expansion bladder 311 will bulge. The operator can judge whether the inside of the shut-off valve body 1 has frozen by observing the volume change of the expansion bladder 311.

[0018] Both the hollow plug 34 and the T-shaped plug 37 are made of heat-insulating material. The bottom of the T-shaped plug 37 is fixed with a double-layer heat-insulating glass cover 312. Through the above structure, the hollow plug 34, the T-shaped plug 37 and the double-layer heat-insulating glass cover 312 form heat-insulating protection on the outside of the water storage column 310 and the expansion bladder 311, thereby preventing the water inside the water storage column 310 and the expansion bladder 311 from freezing due to exposure to the external environment. This ensures that the water in the water storage column 310 and the expansion bladder 311 will only freeze due to the internal temperature of the shut-off valve body 1.

[0019] A wiper device 4 is installed inside the gate valve body 1. The wiper device 4 includes two fixed housings 41, two toothed rings 44, and two rotating rings 47. The two fixed housings 41 are respectively fixed to both sides of the outer wall of the gate valve body 1. A rotating rod 42 is rotatably installed through the two fixed housings 41. Gears 43 are fixed at both ends of the rotating rod 42, and the gears 43 are located inside the fixed housings 41. The two toothed rings 44 and the two rotating rings 47 are rotatably installed on both sides inside the gate valve body 1. The two toothed rings 44 are located on the side of the gate valve body 1 away from the center, and the two rotating rings 47 are located on the side of the gate valve body 1 closer to the center. The toothed rings 44 and the rotating rings 47 are rotatably installed on both sides inside the gate valve body 1. Several U-shaped rods 45 are fixed between the inner walls of the ring 47. On both sides of the U-shaped rods 45 near the inner wall of the shut-off valve body 1, there are scraper blades 46. The scraper blades 46 are in contact with the inner wall of the shut-off valve body 1, and the two scraper blades 46 are arranged in a figure-eight shape with a 10-centimeter gap between them. The drain pipe 36 is located between the two scraper blades 46. Through the above structure, the U-shaped rods 45 drive the scraper blades 46 to rotate, and the two scraper blades 46 arranged in a figure-eight shape scrape the water remaining inside the shut-off valve body 1 toward the drain pipe 36, thereby improving the efficiency of draining the water remaining inside the shut-off valve body 1.

[0020] In use, after the shut-off valve body 1 has been used and there is residual water inside, rotating the screw 32 causes the slide plate 33 to move downwards along the inside of the U-shaped frame 31. The slide plate 33 then moves the hollow plug 34 downwards, causing it to exit the drain pipe 36. At this point, the residual water inside the shut-off valve body 1 will be discharged through the drain pipe 36, thus preventing water from remaining inside the shut-off valve body 1 and freezing in cold weather, which could lead to the shut-off valve body 1 freezing or being damaged. If the inside of the shut-off valve body 1 is already frozen, the ice will freeze the hollow plug 34 and the semi-circular bladder 35 to the shut-off valve body 1. Therefore, at this time, the screw 32... When the sliding plate 33 moves downward, it encounters resistance. The semi-circular bladder 35 comes into contact with the ice inside the shut-off valve body 1. This pushes the F-shaped clamping plate 39 towards the elastic telescopic rod 38. The F-shaped clamping plate 39 squeezes the telescopic end of the elastic telescopic rod 38, and the F-shaped clamping plate 39 no longer jams the T-shaped stopper rod 37. The T-shaped stopper rod 37 is pulled downward, and it draws out the air between the semi-circular bladder 35 and the hollow plug 34. The semi-circular bladder 35 is deformed and concave, thus allowing it to detach from the ice inside the shut-off valve body 1. This ensures that when the hollow plug 34 and the semi-circular bladder 35 are frozen, the sliding plate 33 will not encounter resistance when it moves the hollow plug 34 out of the drain pipe 36.

[0021] Simultaneously, after ice forms inside the shut-off valve body 1, the water inside the water storage column 310 and expansion bladder 311 will also freeze upon cooling. The volume of the frozen water inside the water storage column 310 and expansion bladder 311 will expand, causing the expansion bladder 311 to bulge. Operators can determine whether ice has formed inside the shut-off valve body 1 by observing the volume change of the expansion bladder 311. Once ice is detected inside the shut-off valve body 1, operators can activate the heater body 22. The heater body 22 heats the heating tube 23, which in turn heats the air inside the insulation shell 21 and the outer wall of the shut-off valve body 1. The ice inside the shut-off valve body 1 is melted by the heat. The water can be drained from the shut-off valve body 1 through the drain pipe 36. It should be noted that the insulation materials of the hollow plug 34, the T-shaped plug 37, and the double-layered insulated glass cover 312 form an insulation and protection layer on the outside of the water storage column 310 and the expansion bladder 311. This prevents the water inside the water storage column 310 and the expansion bladder 311 from freezing due to exposure to the external environment. This ensures that the water in the water storage column 310 and the expansion bladder 311 will only freeze due to the internal temperature of the shut-off valve body 1.

[0022] Each time the drain pipe 36 drains water from the body 1 of the shut-off valve, the rotating rod 42 is rotated. The rotating rod 42 drives the gear 43 to rotate, the gear 43 drives the gear ring 44 to rotate, the gear ring 44 drives the U-shaped rod 45 to rotate, and the U-shaped rod 45 drives the scraper 46 to rotate. The two scraper blades 46, which are in the shape of an "eight", scrape the water remaining inside the body 1 of the shut-off valve towards the drain pipe 36, thereby improving the efficiency of draining the water remaining inside the body 1 of the shut-off valve.

[0023] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A freeze-proof shut-off valve for low-temperature environments, comprising a shut-off valve body (1), characterized in that: A heating assembly (2) is provided on the outside of the shut-off valve body (1). An antifreeze device (3) is provided at the bottom of the shut-off valve body (1). The antifreeze device (3) includes a U-shaped frame (31) fixed at the bottom of the shut-off valve body (1) and two drain pipes (36) respectively fixed on both sides of the bottom of the shut-off valve body (1). A screw (32) is rotatably installed inside the U-shaped frame (31). A sliding plate (33) is threadedly connected to the outside of the screw (32). The sliding plate (33) is slidably installed inside the U-shaped frame (31). Hollow plugs (34) are passed through and fixed on both sides of the top of the sliding plate (33). A semi-circular bladder (35) is fixed at the top of the hollow plug (34). A T-shaped plug rod (37) is slidably installed inside the hollow plug rod (34). A spring is provided between the T-shaped plug rod (37) and the bottom of the sliding plate (33). A limiting assembly for limiting the position of the T-shaped plug rod (37) is provided at the bottom of the sliding plate (33).

2. The antifreeze shut-off valve for low-temperature environments according to claim 1, characterized in that: The heating assembly (2) includes a heat insulation shell (21), which is fixed to the outside of the shut-off valve body (1). A heater body (22) is embedded in the outer wall of the heat insulation shell (21). Heating tubes (23) are fixed on both sides of the heater body (22), and the heating tubes (23) are located inside the heat insulation shell (21).

3. The antifreeze shut-off valve for low-temperature environments according to claim 1, characterized in that: The limiting component includes an elastic telescopic rod (38), the fixed end of which is fixed to the bottom of the slide plate (33), and the telescopic end of which is fixed with an F-shaped locking plate (39), the notch of which is engaged with the lower outer wall of the T-shaped plug rod (37).

4. The antifreeze shut-off valve for low-temperature environments according to claim 1, characterized in that: The bottom of the T-shaped plug rod (37) is penetrated and fixed with a water storage column (310), and the bottom of the water storage column (310) is fixed with an expansion bladder (311).

5. The antifreeze shut-off valve for low-temperature environments according to claim 4, characterized in that: The top of the water storage column (310) is in contact with the top of the inner wall of the semi-circular bladder (35), and both the water storage column (310) and the expansion bladder (311) are filled with water.

6. The antifreeze shut-off valve for low-temperature environments according to claim 1, characterized in that: Both the hollow plug (34) and the T-shaped plug (37) are made of thermal insulation material.

7. The antifreeze shut-off valve for low-temperature environments according to claim 1, characterized in that: The bottom of the T-shaped plug (37) is fixed with a double-layer heat-insulating glass cover (312).

8. The antifreeze shut-off valve for low-temperature environments according to claim 1, characterized in that: The shut-off valve body (1) is provided with a wiper device (4). The wiper device (4) includes two fixed shells (41), two toothed rings (44), and two rotating rings (47). The two fixed shells (41) are respectively fixed on both sides of the outer wall of the shut-off valve body (1). A rotating rod (42) is installed through and rotatably between the two fixed shells (41). Gears (43) are fixed at both ends of the rotating rod (42), and the gears (43) are located inside the fixed shells (41). The two toothed rings (44) and the two rotating rings (47) are respectively rotatably installed on both sides inside the shut-off valve body (1). The two toothed rings (44) are located on the side of the shut-off valve body (1) away from the center, and the two rotating rings (47) are located on the side of the shut-off valve body (1) close to the center. Several U-shaped rods (45) are fixed between the inner walls of the toothed rings (44) and the rotating rings (47). Wiper blades (46) are fixed on both sides of the side of the U-shaped rods (45) close to the inner wall of the shut-off valve body (1).

9. A low-temperature environment antifreeze shut-off valve according to claim 8, characterized in that: The wiper blade (46) is in contact with the inner wall of the shut-off valve body (1), and the two wiper blades (46) are arranged in a figure-eight shape.

10. A low-temperature environment antifreeze shut-off valve according to claim 8, characterized in that: A 10-centimeter gap is left between the two wiper blades (46), and the drain pipe (36) is located between the two wiper blades (46).

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