Anti-backflow fire valve

Abstract

The utility model relates to the technical field of fire-fighting valves, in particular to an anti-backflow fire-fighting valve which comprises a valve body, one side of the valve body is fixedly connected with a water inlet pipe, and the other side of the valve body is fixedly connected with a water outlet pipe. Under the impact of water flow, the rotating column can rotate on the inner side of the connecting frame, so that the two sets of connecting plates are driven to rotate towards the valve body, and the water flow enters the valve body; when the valve body is closed, the connecting plates connected to the inner side of the water outlet pipe can be impacted, so that the rotating column can rotate on the inner side of the connecting frame, the two sets of connecting plates are driven to rotate towards the opposite direction of the valve body, and when the valve body is closed, the connecting plates are not impacted by water flow, so that the connecting plates are reset under the elastic action of the torsional spring; therefore, the water inlet pipe and the water outlet pipe are blocked, and water flow backflow is prevented.

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 valve is an important accessory for industrial and building pipeline control. Fire valve consists of three parts: valve body, opening and closing mechanism and valve cover. It has the advantages of simple structure, reliable sealing, easy opening, long life and convenient maintenance. Therefore, it is widely used in various pipelines of water supply and drainage and building fire protection systems. However, the existing fire valve has no backflow prevention function when in use, which leads to water backflow when the valve is closed, affecting the use of the fire valve. Utility Model Content

[0003] The utility model aims to provide a fire valve with backflow prevention to solve the problem that the fire valve proposed in the above background technology has no backflow prevention function during use, resulting in water backflow when the valve is closed, thus affecting the use of the fire valve.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a backflow prevention fire valve, comprising a valve body, one side of the valve body is fixedly connected to a water inlet pipe, the other side of the valve body is fixedly connected to a water outlet pipe, the upper surface of the valve body is rotatably connected to a swivel, the outer surfaces of the water inlet pipe and the water outlet pipe are both fixedly connected to flanges, the inner side of the water outlet pipe is fixedly connected to a connecting frame, the inner side of the connecting frame is rotatably connected to a rotating column, the outer surface of the rotating column is fixedly connected to a fixing column, the outer surface of the fixing column is fixedly connected to a torsion spring, the outer surface of the torsion spring is fixedly connected to a connecting plate, and the outer surface of the connecting frame is fixedly connected to a limiting plate.

[0005] Preferably, a slide groove is opened on the inner side of the flange, a spring is fixedly connected to the inner side of the slide groove, an insertion rod is fixedly connected to the lower surface of the spring, a mounting ring is plugged into the lower surface of the insertion rod, and a sealing gasket is fixedly connected to the outer surface of the mounting ring.

[0006] Preferably, the connecting frame is in the shape of a ring, and cylindrical grooves are opened on both sides of the inner side of the connecting frame. The rotating column is rotatably connected to the inner side of the groove. Its function is to rotate the rotating column on the inner side of the connecting frame, so that the connecting plate can rotate on the inner side of the connecting frame.

[0007] Preferably, the rotating column is cylindrical in shape, the connecting plate is semicircular in shape, a cylindrical groove is provided on the inner side of the connecting plate, the rotating column is rotatably connected to the inner side of the groove, the torsion spring is spiral in shape, one end of the torsion spring is fixedly connected to the connecting plate, and the other end of the torsion spring is fixedly connected to the rotating column, and its function is that when water flows in, due to the impact of the water flow, the connecting plate connected to the inner side of the water inlet pipe will be impacted, so that the rotating column will rotate on the inner side of the connecting frame, thereby driving the two sets of connecting plates toward the valve body When the valve body is closed, the lack of water impact causes the connecting plate to be reset under the elastic action of the torsion spring and the limiting action of the limiting plate, thereby achieving the effect of preventing backflow.

[0008] Preferably, the limit plate is in the shape of a circular ring, and the limit plate is fixedly connected to one side of the connecting frame. The connecting frame, rotating column, fixed column, torsion spring, connecting plate and limit plate are divided into two groups and are respectively arranged to connect the inner sides of the water inlet pipe and the water outlet pipe. Its function is to reset the connecting plate through the rotation of the connecting plate and the limiting of the limit plate, thereby achieving the purpose of preventing backflow.

[0009] Preferably, the slide groove is cylindrical in shape, and the slide groove is formed in two groups at the upper and lower ends of the inner side of the flange. The spring is spiral in shape, and the spring is fixedly connected between the inner side of the slide groove and the insertion rod. The insertion rod is cylindrical in shape, and the bottom of the insertion rod is hemispherical. Its function is that when the mounting ring is slidably connected to the inner side of the flange, it will squeeze the insertion rod, so that the insertion rod slides upward on the inner side of the slide groove. When the mounting ring completely enters the inner side of the flange, under the elastic action of the spring, the insertion rod will be inserted into the inner side of the groove opened at the upper end of the mounting ring, thereby fixing the mounting ring to the inner side of the flange.

[0010] Preferably, the mounting ring is in the shape of a circular ring, the outer surface of the flange is provided with a groove matched with the mounting ring, the sealing gasket is in the shape of a circular ring, and the sealing gasket is movably connected to the outer surface of the flange. Its function is to fix the mounting ring to the inner side of the flange, thereby fixing the sealing gasket to the outer surface of the flange, thereby facilitating the connection between the flange and the water pipe, so that the water pipe can be quickly installed and connected to the valve body, facilitating firefighting operations and preventing the need to manually add the sealing gasket during installation, which makes the installation cumbersome.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. When the valve body is in use, water enters the inner side of the valve body from the water inlet pipe and then flows out from the water outlet pipe. When water flows to the inner side of the water inlet pipe, the connecting plate connected to the inner side of the water inlet pipe will be impacted by the impact of the water flow, so that the rotating column will rotate on the inner side of the connecting frame, thereby driving the two groups of connecting plates to rotate toward the valve body, so that the water flows into the interior of the valve body. When the water flows out from the water outlet pipe, the connecting plate connected to the inner side of the water outlet pipe will be impacted by the impact of the water flow, so that the rotating column will rotate on the inner side of the connecting frame, thereby driving the two groups of connecting plates to rotate in the opposite direction of the valve body, thereby making the water flow out. When the valve body is closed, the connecting plate is no longer impacted by the water flow, so that under the elastic action of the torsion spring, the connecting plate is reset, thereby blocking the water inlet pipe and the water outlet pipe, thereby preventing water from flowing back, thereby facilitating the use of the valve body.

[0013] 2. By sliding the mounting ring to the inner side of the groove formed on the outer surface of the rotating ring, since the bottom of the plug rod is spherical, when the mounting ring contacts the plug rod, the plug rod slides upward on the inner side of the slide groove under the extrusion of the mounting ring. When the mounting ring completely enters the inner side of the flange, the plug rod slides downward under the elastic action of the slide groove and is inserted into the groove formed on the upper surface of the mounting ring, thereby fixing the mounting ring to the inner side of the flange, making it convenient to connect to the water pipe and having better sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view stereoscopic schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a side perspective schematic diagram of the structure of the utility model;

[0016] Figure 3 It is a sectional three-dimensional schematic diagram of a local structure of the utility model;

[0017] Figure 4 For this utility model Figure 3 A schematic three-dimensional cross-sectional view of the structure of the middle water outlet pipe;

[0018] Figure 5 For this utility model Figure 3 A schematic diagram of the structure enlargement at the center A;

[0019] Figure 6 For this utility model Figure 4 A magnified schematic diagram of the structure at point B in the middle.

[0020] In the figure: 1. valve body; 2. water inlet pipe; 3. water outlet pipe; 4. swivel; 5. flange; 6. connecting frame; 7. swivel column; 8. fixing column; 9. torsion spring; 10. connecting plate; 11. limit plate; 12. slide groove; 13. spring; 14. plug rod; 15. mounting ring; 16. sealing gasket. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-6 , an embodiment provided by the utility model:

[0023] A backflow prevention fire valve comprises a valve body 1, one side of the valve body 1 is fixedly connected to a water inlet pipe 2, the other side of the valve body 1 is fixedly connected to a water outlet pipe 3, the upper surface of the valve body 1 is rotatably connected to a swivel 4, the outer surfaces of the water inlet pipe 2 and the water outlet pipe 3 are both fixedly connected to flanges 5, the inner side of the water outlet pipe 3 is fixedly connected to a connecting frame 6, the inner side of the connecting frame 6 is rotatably connected to a rotating column 7, the outer surface of the rotating column 7 is fixedly connected to a fixing column 8, the outer surface of the fixing column 8 is fixedly connected to a torsion spring 9, the outer surface of the torsion spring 9 is fixedly connected to a connecting plate 10, and the outer surface of the connecting frame 6 is fixedly connected to a limiting plate 11.

[0024] Furthermore, a slide groove 12 is opened on the inner side of the flange 5, a spring 13 is fixedly connected to the inner side of the slide groove 12, an insert rod 14 is fixedly connected to the lower surface of the spring 13, a mounting ring 15 is plugged into the lower surface of the insert rod 14, and a sealing gasket 16 is fixedly connected to the outer surface of the mounting ring 15.

[0025] Furthermore, the connecting frame 6 is in the shape of a circular ring, and cylindrical grooves are opened on both sides of the inner side of the connecting frame 6. The rotating column 7 is rotatably connected to the inner side of the groove. Its function is to rotate the rotating column 7 on the inner side of the connecting frame 6, so that the connecting plate 10 can rotate on the inner side of the connecting frame 6.

[0026] Furthermore, the rotating column 7 is cylindrical in shape, the connecting plate 10 is semicircular in shape, a cylindrical groove is provided on the inner side of the connecting plate 10, the rotating column 7 is rotatably connected to the inner side of the groove, the torsion spring 9 is spiral in shape, one end of the torsion spring 9 is fixedly connected to the connecting plate 10, and the other end of the torsion spring 9 is fixedly connected to the rotating column 7, and its function is that when water enters, due to the impact of the water flow, the connecting plate 10 connected to the inner side of the water inlet pipe 2 will be impacted, so that the rotating column 7 will rotate on the inner side of the connecting frame 6, thereby driving the two groups of connecting plates 10 to rotate toward the valve body 1. Thereby, water flows into the interior of the valve body 1. When the water flows out from the water outlet pipe 3, the connecting plate 10 connected to the inner side of the water outlet pipe 3 will be impacted by the impact of the water flow, so that the rotating column 7 will rotate on the inner side of the connecting frame 6, thereby driving the two groups of connecting plates 10 to rotate in the opposite direction of the valve body 1, so that water flows out from the water outlet pipe 3. When the valve body 1 is closed, the lack of water impact makes the connecting plate 10 reset under the elastic action of the torsion spring 9 and the limiting action of the limiting plate 11, thereby achieving the effect of preventing backflow.

[0027] Furthermore, the limit plate 11 is in the shape of a circular ring, and the limit plate 11 is fixedly connected to one side of the connecting frame 6. The connecting frame 6, the rotating column 7, the fixed column 8, the torsion spring 9, the connecting plate 10 and the limit plate 11 are all divided into two groups and respectively arranged to connect the inner sides of the water inlet pipe 2 and the water outlet pipe 3. Its function is to reset the connecting plate 10 through the rotation of the connecting plate 10 and the limiting of the limit plate 11, thereby achieving the purpose of preventing backflow.

[0028] Furthermore, the slide groove 12 is cylindrical in shape, and the slide groove 12 is opened in two groups at the upper and lower ends of the inner side of the flange 5. The spring 13 is spiral in shape, and the spring 13 is fixedly connected between the inner side of the slide groove 12 and the plug rod 14. The plug rod 14 is cylindrical in shape, and the bottom of the plug rod 14 is hemispherical. Its function is that when the mounting ring 15 is slidably connected to the inner side of the flange 5, it will squeeze the plug rod 14, so that the plug rod 14 slides upward on the inner side of the slide groove 12. When the mounting ring 15 completely enters the inner side of the flange 5, under the elastic action of the spring 13, the plug rod 14 will be inserted into the inner side of the groove opened at the upper end of the mounting ring 15, thereby fixing the mounting ring 15 to the inner side of the flange 5.

[0029] Furthermore, the mounting ring 15 is in the shape of a circular ring, and the outer surface of the flange 5 is provided with a groove matched with the mounting ring 15. The sealing gasket 16 is in the shape of a circular ring, and the sealing gasket 16 is movably connected to the outer surface of the flange 5. Its function is to fix the mounting ring 15 to the inner side of the flange 5, thereby fixing the sealing gasket 16 to the outer surface of the flange 5, thereby facilitating the connection of the flange 5 with the water pipe, so that the water pipe can be quickly installed and connected to the valve body 1, which is convenient for fire-fighting operations and prevents the need to manually add the sealing gasket 16 during installation, thereby making the installation cumbersome.

[0030] Working principle: A connecting frame 6 is fixedly connected to the inner side of the water outlet pipe 3, a rotating column 7 is rotatably connected to the inner side of the connecting frame 6, a fixing column 8 is fixedly connected to the outer surface of the rotating column 7, a torsion spring 9 is fixedly connected to the outer surface of the fixing column 8, a connecting plate 10 is fixedly connected to the outer surface of the torsion spring 9, and a limiting plate 11 is fixedly connected to the outer surface of the connecting frame 6. When the valve body 1 is in use, water enters the inner side of the valve body 1 from the water inlet pipe 2 and then flows out from the water outlet pipe 3. When water flows to the inner side of the water inlet pipe 2, the connecting plate 10 connected to the inner side of the water inlet pipe 2 will be impacted by the impact of the water flow, so that the rotating column 7 will rotate on the inner side of the connecting frame 6, thereby causing the valve body 1 to be moved. The two groups of connecting plates 10 are driven to rotate toward the valve body 1, so that water flows into the interior of the valve body 1. When the water flows out from the water outlet pipe 3, the connecting plate 10 connected to the inner side of the water outlet pipe 3 will be impacted by the impact of the water flow, so that the rotating column 7 will rotate on the inner side of the connecting frame 6, thereby driving the two groups of connecting plates 10 to rotate in the opposite direction toward the valve body 1, so that water flows out. When the valve body 1 is closed, the connecting plate 10 is no longer impacted by the water flow, so that under the elastic action of the torsion spring 9, the connecting plate 10 is reset, thereby blocking the water inlet pipe 2 and the water outlet pipe 3, thereby preventing water from flowing back, thereby facilitating the use of the valve body 1.

[0031] A slide groove 12 is provided on the inner side of the flange 5, and a spring 13 is fixedly connected to the inner side of the slide groove 12. A plug rod 14 is fixedly connected to the lower surface of the spring 13. A mounting ring 15 is plugged and connected to the lower surface of the plug rod 14. A sealing gasket 16 is fixedly connected to the outer surface of the mounting ring 15. The mounting ring 15 is slidably connected to the inner side of the groove provided on the outer surface of the swivel 4. Since the bottom of the plug rod 14 is spherical, when the mounting ring 15 contacts the plug rod 14, the plug rod 14 slides upward on the inner side of the slide groove 12 under the extrusion of the mounting ring 15. When the mounting ring 15 completely enters the inner side of the flange 5, the plug rod 14 slides downward under the elastic action of the slide groove 12 and is plugged into the groove provided on the upper surface of the mounting ring 15, thereby fixing the mounting ring 15 to the inner side of the flange 5, which is convenient for connection with the water pipe and has better sealing performance.

[0032] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A fire valve for preventing backflow, comprising a valve body (1), characterized in that: One side of the valve body (1) is fixedly connected to a water inlet pipe (2), and the other side of the valve body (1) is fixedly connected to a water outlet pipe (3). The upper surface of the valve body (1) is rotatably connected to a swivel (4). The outer surfaces of the water inlet pipe (2) and the water outlet pipe (3) are both fixedly connected to flanges (5). The inner side of the water outlet pipe (3) is fixedly connected to a connecting frame (6). The inner side of the connecting frame (6) is rotatably connected to a rotating column (7). The outer surface of the rotating column (7) is fixedly connected to a fixing column (8). The outer surface of the fixing column (8) is fixedly connected to a torsion spring (9). The outer surface of the torsion spring (9) is fixedly connected to a connecting plate (10). The outer surface of the connecting frame (6) is fixedly connected to a limiting plate (11).

2. A fire valve for preventing backflow according to claim 1, characterized in that: A slide groove (12) is provided on the inner side of the flange (5), a spring (13) is fixedly connected to the inner side of the slide groove (12), an insertion rod (14) is fixedly connected to the lower surface of the spring (13), a mounting ring (15) is plugged into the lower surface of the insertion rod (14), and a sealing gasket (16) is fixedly connected to the outer surface of the mounting ring (15).

3. The fire valve for preventing backflow according to claim 1, characterized in that: The connecting frame (6) is in the shape of a circular ring, and cylindrical grooves are provided on both sides of the inner side of the connecting frame (6), and the rotating column (7) is rotatably connected to the inner side of the groove.

4. A fire valve for preventing backflow according to claim 3, characterized in that: The rotating column (7) is cylindrical in shape, the connecting plate (10) is semicircular in shape, a cylindrical groove is provided on the inner side of the connecting plate (10), the torsion spring (9) is spiral in shape, one end of the torsion spring (9) is fixedly connected to the connecting plate (10), and the other end of the torsion spring (9) is fixedly connected to the rotating column (7).

5. A fire valve for preventing backflow according to claim 4, characterized in that: The limiting plate (11) is in the shape of a circular ring and is fixedly connected to one side of the reconnecting frame (6). The connecting frame (6), the rotating column (7), the fixing column (8), the torsion spring (9), the connecting plate (10) and the limiting plate (11) are arranged in two groups and are respectively connected to the inner sides of the reconnecting water inlet pipe (2) and the water outlet pipe (3).

6. The fire valve for preventing backflow according to claim 2, characterized in that: The slide groove (12) is cylindrical in shape, and the slide groove (12) is formed into two groups and opened at the upper and lower ends of the inner side of the flange (5). The spring (13) is spiral in shape, and the spring (13) is fixedly connected between the inner side of the slide groove (12) and the insertion rod (14). The insertion rod (14) is cylindrical in shape, and the bottom of the insertion rod (14) is hemispherical in shape.

7. A fire valve for preventing backflow according to claim 6, characterized in that: The mounting ring (15) is in the shape of a circular ring, the outer surface of the flange (5) is provided with a groove matched with the mounting ring (15), the sealing gasket (16) is in the shape of a circular ring, and the sealing gasket (16) is movably connected to the outer surface of the flange (5).

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