Anti-backflow fire valve

Abstract

The utility model discloses an anti-backflow fire-fighting valve, which relates to the technical field of fire-fighting valves and comprises a valve body, the lower surface of the valve body is fixedly connected with a water inlet pipe in a penetrating manner, the left side of the upper part of the outer surface of the valve body is fixedly connected with a water outlet pipe in a penetrating manner, and one end, far away from the valve body, of the outer surface of the water outlet pipe is fixedly connected with a clamping disc. A protection assembly is arranged on the outer surface of the clamping disc, and the upper surface of the valve body is connected with a lead screw in a penetrating and threaded mode. The screw rod is rotated to enable the second circular sealing block to move upwards and drive the second circular sealing block, when the water pressure is large, water pushes the baffle to drive the arc-shaped elastic plate and the spring, so that the water enters the water outlet pipe and is discharged, and when the water pressure is reduced, the water is discharged through the arc-shaped elastic plate and the spring under the elastic action of the arc-shaped elastic plate and the spring. Therefore, the water is quickly cut off, the water backflow phenomenon is prevented, the problem that the number of current structures is large is solved, and the effect that the internal structure is simple is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fire valves, in particular to a backflow-preventing fire valve. Background Art

[0002] Fire valves are an important accessory for fire protection industry and building pipeline control. Fire valves are composed of three major parts: valve body, opening and closing mechanism, and valve cover. The valve is a control component in the fluid delivery system, with functions such as cut-off, regulation, diversion, prevention of backflow, pressure stabilization, diversion or overflow pressure relief. The stop-flow structure inside the existing fire valve closes its water outlet through the backflow water pressure, but the premise of this method is that the backflow water pressure is strong enough to reset the stop-flow drill structure. If the backflow water pressure is too small, the stop-flow structure cannot be completely reset, which leads to water leakage and cannot effectively prevent backflow.

[0003] According to patent publication number CN218761629U, a fire valve with backflow prevention is disclosed, which relates to the technical field of fire fighting equipment, including a valve body, a water inlet pipe is fixedly connected to the bottom surface of the valve body, a reset mechanism is arranged on the inner wall of the water inlet pipe, a water outlet pipe is installed on the outer surface of the valve body, a clamping disk is fixedly connected to the end of the water outlet pipe away from the outer surface of the valve body, a slide groove is provided on the outer surface of the valve body, a rotating shaft is rotatably connected to the inner wall of the slide groove, a turntable is fixedly connected to the outer surface of the turntable, a limiting block is fixedly connected to the upper surface of the valve body, the inner wall of the limiting block is rotatably connected to the outer surface of the turntable, a first fixing ring is fixedly connected to the inner wall of the valve body, and a bearing sealing plate is fixedly connected to the end of the turntable away from the outer surface of the turntable. The utility model can automatically cut off the water inlet pipe to prevent backflow when the water valve is closed by setting a reset mechanism, thereby avoiding the problem of water source leakage, and realizing the practicality of the fire valve with backflow prevention. The following problems exist in the prior art:

[0004] In the above-mentioned publication number CN218761629U, there are many anti-backflow structures inside, which leads to the problem of internal clutter. At the same time, since the card plate in the above-mentioned publication number CN218761629U is not provided with a protective structure, the card plate is directly exposed to the outside, resulting in the phenomenon of foreign matter inside the card plate, which makes installation and connection inconvenient. Utility Model Content

[0005] The utility model provides a backflow prevention fire fighting valve to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A backflow prevention fire valve comprises a valve body, wherein a water inlet pipe is passed through and fixedly connected to the lower surface of the valve body, a water outlet pipe is passed through and fixedly connected to the upper left side of the outer surface of the valve body, a clamping disk is fixedly connected to the outer surface of the water outlet pipe away from the valve body, a protective component is provided on the outer surface of the clamping disk, and a screw rod is threadedly connected to the upper surface of the valve body.

[0008] A circular sealing block 1 is overlapped on the lower surface of the inner wall of the valve body, and the outer surface of the circular sealing block 1 is overlapped and pressed tightly against the inner wall of the valve body. The front and rear sides of the upper surface of the circular sealing block 1 are fixedly connected with fixing columns, and a baffle is overlapped on the middle part of the upper surface of the circular sealing block 1, and a circular sealing block 2 is fixedly connected to the upper end of the fixing column, and the outer surface of the circular sealing block 2 is overlapped and pressed tightly against the inner wall of the valve body, and an arc-shaped elastic plate is fixedly connected to the upper surface of the baffle, and a spring is fixedly connected to the right side of the outer surface of the arc-shaped elastic plate, and one end of the spring away from the arc-shaped elastic plate is fixedly connected to a spring plate, and the upper and lower ends of the spring plate are respectively fixedly connected to the surfaces of the circular sealing block 2 and the circular sealing block 1, and the outer surface of the spring plate overlaps the inner wall of the valve body.

[0009] A further improvement of the technical solution of the utility model is that: a water outlet communicating with each other up and down is opened on the upper surface of the circular sealing block 1, a sealing block is overlapped inside the water outlet, and the upper surface of the sealing block is fixedly connected to the lower surface of the baffle.

[0010] A further improvement of the technical solution of the utility model is that: the upper surface of the baffle is fixedly connected with an L-shaped fixing plate, the interior of the L-shaped fixing plate is movably connected with a movable seat, and the lower surface of the movable seat is fixedly connected with the upper surface of the circular sealing block.

[0011] A further improvement of the technical solution of the utility model is that a circular hole communicating with each other from top to bottom is provided in the middle of the upper surface of the circular sealing block 2.

[0012] A further improvement of the technical solution of the utility model is that two rubber blocks are arranged below the outer surface of the screw rod, the upper surface of the upper rubber block is fixedly connected to the lower end of the screw rod, a connecting column is fixedly connected to the middle of the opposite surfaces of the two rubber blocks, and the lower surface of the lower rubber block is fixedly connected to the upper part of the outer surface of the arc-shaped elastic plate.

[0013] A further improvement of the technical solution of the utility model is that a rubber sealing sleeve is fixedly connected to the outer surface of the connecting column, the outer surfaces of the connecting column and the rubber sealing sleeve penetrate the interior of the circular hole, and the outer surface of the rubber sealing sleeve overlaps and presses against the interior of the circular hole, and the opposite surfaces of the two rubber blocks overlap and press against the upper and lower surfaces of the circular sealing blocks respectively.

[0014] A further improvement of the technical solution of the utility model is that: the protective component includes an end cover, the interior of the end cover is sleeved with the outer surface of the card plate, the outer surface of the end cover is fixedly connected with plastic plug-in blocks on both the front and rear sides, the right side of the plastic plug-in block is provided with a slot communicating with each other up and down, the outer surface of the plastic plug-in block is plugged with a metal block, the outer surface of the metal block is fixedly connected to the surface of the card plate, the interior of the slot is overlapped with an extrusion block, and the outer surface of the extrusion block is fixedly connected to the surface of the metal block.

[0015] A further improvement of the technical solution of the utility model is that a card slot is opened on the front of the plastic plug-in block, an L-shaped plastic card block is clamped inside the card slot, and the horizontal outer surface of the L-shaped plastic card block is fixedly connected to the surface of the metal block.

[0016] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0017] The utility model provides a fire valve to prevent backflow, which adopts the mutual cooperation of a circular sealing block 1, a water outlet, a fixing column, a baffle, a circular sealing block 2, an arc-shaped elastic plate, a spring, a spring plate, a movable seat and an L-shaped fixing plate. The circular sealing block 2 is moved upward and drives the circular sealing block 2 by rotating a screw rod. When the water pressure is relatively large, the water pushes the baffle to drive the arc-shaped elastic plate and the spring, so that water enters the water outlet pipe and is discharged. When the water pressure becomes small, due to the elastic action of the arc-shaped elastic plate and the spring, the water is quickly cut off to prevent the backflow of water. The utility model solves many problems of the current structure and achieves the effect of simple internal structure.

[0018] The utility model provides a fire valve for preventing backflow, which adopts the mutual cooperation of an end cover, a metal block, a plastic plug-in block, an L-shaped plastic clamping block and an extrusion block. The end cover is arranged to facilitate the protection of the clamping plate, the metal block and the plastic plug-in block are arranged to facilitate the positioning, and the L-shaped plastic clamping block and the extrusion block are arranged to fix the position of the end cover, thereby solving the problem that the current clamping plate is not provided with a protective structure, thereby causing foreign matter inside, and achieving the effect of facilitating the protection of the clamping plate, and preventing the clamping plate from having foreign matter and being unable to be connected to the clamping plate in the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the valve body of the utility model;

[0021] Figure 3 This is a schematic diagram of the exploded structure of the circular sealing block 1, the baffle, the movable seat, and the L-shaped fixing plate of the utility model;

[0022] Figure 4 This is a schematic diagram of the exploded structure of the screw rod and the circular sealing block of the utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the protection component of the utility model;

[0024] Figure 6 It is a schematic diagram of the enlarged structure of point A of the utility model.

[0025] In the figure: 1. valve body; 11. circular sealing block 1; 111. water outlet; 12. fixing column; 13. baffle; 131. sealing block; 14. circular sealing block 2; 141. circular hole; 15. arc elastic plate; 16. spring; 17. spring plate; 101. movable seat; 102. L-shaped fixing plate; 2. water inlet pipe; 3. water outlet pipe; 4. protective component; 41. end cover; 42. metal block; 43. plastic plug block; 44. L-shaped plastic clamp block; 45. extrusion block; 5. screw rod; 51. rubber block; 52. connecting column; 53. rubber sealing sleeve; 6. clamping plate. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0027] like Figure 1 As shown, the utility model provides a fire valve for preventing backflow, comprising a valve body 1, a water inlet pipe 2 is fixedly connected to the lower surface of the valve body 1, a water outlet pipe 3 is fixedly connected to the upper left side of the outer surface of the valve body 1, a clamping plate 6 is fixedly connected to the end of the outer surface of the water outlet pipe 3 away from the valve body 1, a protective component 4 is arranged on the outer surface of the clamping plate 6, and a screw rod 5 is threadedly connected to the upper surface of the valve body 1;

[0028] The protection component 4 is provided so as to protect the position of the clamping plate 6 and effectively prevent foreign matter from entering the interior. The screw rod 5 is provided so as to facilitate the closing or opening of the valve body 1.

[0029] like Figure 2 - Figure 3As shown, a circular sealing block 11 is overlapped on the lower surface of the inner wall of the valve body 1, and the outer surface of the circular sealing block 11 is overlapped and pressed against the inner wall of the valve body 1, and the upper surface of the circular sealing block 11 is fixedly connected with fixing columns 12 on both the front and rear sides, and a baffle 13 is overlapped on the middle part of the upper surface of the circular sealing block 11, and a circular sealing block 2 14 is fixedly connected to the upper end of the fixing column 12, and the outer surface of the circular sealing block 2 14 is overlapped and pressed against the inner wall of the valve body 1, and an arc-shaped elastic plate 15 is fixedly connected to the upper surface of the baffle 13, and a spring 16 is fixedly connected to the right side of the outer surface of the arc-shaped elastic plate 15, and the end of the spring 16 away from the arc-shaped elastic plate 15 is fixedly connected A spring plate 17 is connected, and the upper and lower ends of the spring plate 17 are fixedly connected to the surfaces of the circular sealing block 2 14 and the circular sealing block 11 respectively. The outer surface of the spring plate 17 overlaps the inner wall of the valve body 1, and the upper surface of the circular sealing block 11 is provided with an outlet 111 that communicates with each other from top to bottom. A sealing block 131 overlaps the inside of the water outlet 111, and the upper surface of the sealing block 131 is fixedly connected to the lower surface of the baffle 13. The upper surface of the baffle 13 is fixedly connected to an L-shaped fixed plate 102, and the inside of the L-shaped fixed plate 102 is movably connected to a movable seat 101, and the lower surface of the movable seat 101 is fixedly connected to the upper surface of the circular sealing block 11;

[0030] By rotating the screw rod 5, the circular sealing block 14 is moved upward, and the circular sealing block 11 is driven by the action of the fixed column 12. When the circular sealing block 14 moves upward to the appropriate position, and when the water pressure is large, the water pushes the sealing block 131 and the baffle 13, thereby driving the L-shaped fixed plate 102 to move inside the movable seat 101, so that the sealing block 131 and the baffle 13 are in an open state, and at the same time, the arc-shaped elastic plate 15 is squeezed to deform and bend, and after the deformation and bending, the spring 16 is contracted, so that water passes through the water outlet 111 and enters the water outlet pipe 3 to be discharged. When the water pressure becomes smaller, due to the elastic action of the arc-shaped elastic plate 15 and the spring 16, the baffle 13 and the sealing block 131 are pushed and returned to their original positions, so that the sealing block 131 enters the inside of the water outlet 111, thereby quickly cutting off the water to prevent water backflow. When it needs to be closed, the circular sealing block 14 is moved downward again by rotating the screw rod 5, thereby closing.

[0031] like Figure 4As shown, a circular hole 141 communicating with each other from top to bottom is opened in the middle of the upper surface of the circular sealing block 14, and two rubber blocks 51 are arranged below the outer surface of the screw rod 5. The upper surface of the upper rubber block 51 is fixedly connected to the lower end of the screw rod 5, and a connecting column 52 is fixedly connected to the middle of the opposite surfaces of the two rubber blocks 51. The lower surface of the lower rubber block 51 is fixedly connected to the upper part of the outer surface of the arc elastic plate 15, and the outer surface of the connecting column 52 is fixedly connected to the rubber sealing sleeve 53. The outer surfaces of the connecting column 52 and the rubber sealing sleeve 53 pass through the inside of the circular hole 141, and the outer surface of the rubber sealing sleeve 53 overlaps and presses against the inside of the circular hole 141, and the opposite surfaces of the two rubber blocks 51 overlap and press against the upper and lower surfaces of the circular sealing block 14 respectively;

[0032] When the screw rod 5 rotates, the rubber sealing sleeve 53 rotates inside the circular hole 141, and the rubber sealing sleeve 53 and the circular hole 141 are tightly fitted together, so that a sealing phenomenon is achieved. At the same time, the setting of the upper and lower rubber blocks 51 enhances the sealing performance.

[0033] like Figure 5 As shown in Figure 6, the protective component 4 includes an end cover 41, the interior of the end cover 41 is sleeved with the outer surface of the card plate 6, the outer surface of the end cover 41 is fixedly connected with plastic plug blocks 43 on both the front and rear sides, the right side of the plastic plug block 43 is provided with a slot communicating with each other from top to bottom, the outer surface of the plastic plug block 43 is plugged with a metal block 42, the outer surface of the metal block 42 is fixedly connected with the surface of the card plate 6, the interior of the slot is overlapped with an extrusion block 45, the outer surface of the extrusion block 45 is fixedly connected with the surface of the metal block 42, the front side of the plastic plug block 43 is provided with a card slot, the interior of the card slot is carded with an L-shaped plastic card block 44, and the horizontal outer surface of the L-shaped plastic card block 44 is fixedly connected with the surface of the metal block 42;

[0034] After the end cover 41 is put on the outer surface of the card plate 6, the end cover 41 is pushed to drive the front and rear plastic blocks 43 to be inserted into the metal block 42, so that the slot in the plastic block 43 contacts the extrusion block 45, so that the two sides of the slot are slightly deformed and expanded outward, thereby increasing the friction between the plastic block 43 and the metal block 42, and at the same time, the L-shaped plastic block 44 is released. Since the plastic has good ductility, the L-shaped plastic block 44 is deformed and bent at this time. After being released, it is stuck in the card slot, which facilitates fixation. When disassembly is required, the L-shaped plastic block 44 is directly pulled and deformed, so that the end cover 41 is removed by force to complete the disassembly.

[0035] The following is a detailed description of the working principle of the anti-backflow fire valve.

[0036] By rotating the screw rod 5, the circular sealing block 14 moves upward, and the circular sealing block 11 is driven by the action of the fixing column 12. When the circular sealing block 14 moves upward to the appropriate position, and when the water pressure is large, the water pushes the sealing block 131 and the baffle 13 to facilitate the opening state, and at the same time squeezes the arc elastic plate 15 and the spring 16, so that the water passes through the water outlet 111 and enters the water outlet pipe 3 to be discharged. When the water pressure becomes smaller, due to the elastic action of the arc elastic plate 15 and the spring 16, the baffle 13 and the sealing block 131 are pushed and returned to their original positions, thereby quickly cutting off the water and preventing the water from flowing back. After the end cover 41 is put on the outer surface of the clamping plate 6, the end cover 41 is pushed to drive the front and rear plastic plugs 43 to be inserted into the inside of the metal block 42, so that the slot in the plastic plug 43 contacts the extrusion block 45 and increases the friction force, and at the same time, the L-shaped plastic clamp 44 is released and clamped to the inside of the clamping slot, so as to facilitate the fixation.

[0037] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A fire valve for preventing backflow, comprising a valve body (1), characterized in that: A water inlet pipe (2) is passed through and fixedly connected to the lower surface of the valve body (1); a water outlet pipe (3) is passed through and fixedly connected to the upper left side of the outer surface of the valve body (1); a clamping plate (6) is fixedly connected to the outer surface of the water outlet pipe (3) at one end away from the valve body (1); a protective component (4) is provided on the outer surface of the clamping plate (6); and a screw rod (5) is passed through and threadedly connected to the upper surface of the valve body (1); A circular sealing block 1 (11) is overlapped on the lower surface of the inner wall of the valve body (1), the outer surface of the circular sealing block 1 (11) is overlapped and pressed against the inner wall of the valve body (1), the upper surface of the circular sealing block 1 (11) is fixedly connected to fixing columns (12) on both the front and rear sides, the middle part of the upper surface of the circular sealing block 1 (11) is overlapped with a baffle (13), the upper end of the fixing column (12) is fixedly connected to a circular sealing block 2 (14), the outer surface of the circular sealing block 2 (14) is overlapped with the valve body (1), and the outer surface of the circular sealing block 2 (14) is overlapped with the inner wall of the valve body (1). The inner wall of the baffle (13) is overlapped and pressed tightly, the upper surface of the baffle plate (13) is fixedly connected to an arc-shaped elastic plate (15), the right side of the outer surface of the arc-shaped elastic plate (15) is fixedly connected to a spring (16), the end of the spring (16) away from the arc-shaped elastic plate (15) is fixedly connected to a spring plate (17), the upper and lower ends of the spring plate (17) are respectively fixedly connected to the surfaces of the circular sealing block 2 (14) and the circular sealing block 1 (11), and the outer surface of the spring plate (17) overlaps the inner wall of the valve body (1).

2. A fire valve for preventing backflow according to claim 1, characterized in that: The upper surface of the circular sealing block 1 (11) is provided with a water outlet (111) communicating with each other from top to bottom, a sealing block (131) is overlapped inside the water outlet (111), and the upper surface of the sealing block (131) is fixedly connected to the lower surface of the baffle (13).

3. The fire valve for preventing backflow according to claim 1, characterized in that: The upper surface of the baffle (13) is fixedly connected to an L-shaped fixing plate (102), the interior of the L-shaped fixing plate (102) is movably connected to a movable seat (101), and the lower surface of the movable seat (101) is fixedly connected to the upper surface of the circular sealing block (11).

4. The fire valve for preventing backflow according to claim 1, characterized in that: A circular hole (141) communicating with each other from top to bottom is provided in the middle of the upper surface of the second circular sealing block (14).

5. The fire valve for preventing backflow according to claim 1, characterized in that: Two rubber blocks (51) are arranged below the outer surface of the screw rod (5); the upper surface of the upper rubber block (51) is fixedly connected to the lower end of the screw rod (5); a connecting column (52) is fixedly connected to the middle of the opposing surfaces of the two rubber blocks (51); and the lower surface of the lower rubber block (51) is fixedly connected to the upper part of the outer surface of the arc-shaped elastic plate (15).

6. A fire valve for preventing backflow according to claim 5, characterized in that: The outer surface of the connecting column (52) is fixedly connected to a rubber sealing sleeve (53); the outer surfaces of the connecting column (52) and the rubber sealing sleeve (53) penetrate the interior of the circular hole (141); the outer surface of the rubber sealing sleeve (53) overlaps and presses against the interior of the circular hole (141); and the opposing surfaces of the two rubber blocks (51) overlap and press against the upper and lower surfaces of the second circular sealing block (14), respectively.

7. The fire valve for preventing backflow according to claim 1, characterized in that: The protection component (4) comprises an end cover (41), the interior of the end cover (41) is sleeved with the outer surface of the clamping plate (6), the outer surface of the end cover (41) is fixedly connected to plastic plug blocks (43) on both the front and rear sides, the right side of the plastic plug block (43) is provided with a slot communicating with each other up and down, the outer surface of the plastic plug block (43) is plugged with a metal block (42), the outer surface of the metal block (42) is fixedly connected to the surface of the clamping plate (6), the interior of the slot is overlapped with an extrusion block (45), and the outer surface of the extrusion block (45) is fixedly connected to the surface of the metal block (42).

8. The fire valve for preventing backflow according to claim 7, characterized in that: A slot is provided on the front of the plastic insert block (43), an L-shaped plastic block (44) is clamped inside the slot, and a horizontal outer surface of the L-shaped plastic block (44) is fixedly connected to the surface of the metal block (42).

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