Dry-type alarm valve

Abstract

The utility model discloses a dry-type alarm valve, which relates to the technical field of fire fighting equipment, and is characterized in that the outer wall of a system pipe is fixedly connected with a water outlet pipe, the inner wall of the system pipe is provided with an opening, the opening is communicated with the water outlet pipe, a rotating piece rotationally connected with the inner wall of the system pipe is arranged below the opening, and the rotating piece is fixedly connected with the system pipe. The rotating part can cover the opening after being turned upwards and is sealed with the inner wall of the system pipe, the rotating part covers the opening if the water flow pressure is enough, the water outlet pipe is in a water-free state, the rotating part cannot cover the opening if the water flow pressure is not enough, the water outlet pipe is in a water state, and the water outlet pipe is communicated with the outside. The state of the alarm valve can be monitored, quick response can be achieved when air pressure leakage occurs, and the stability of normal use of the alarm valve is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of fire-fighting equipment, and more specifically, to a dry-type alarm valve. Background Art

[0002] A dry alarm valve is a one-way valve that is filled with compressed gas on its outlet side. When the compressed gas level falls below a certain value, water automatically flows into the sprinkler system and an alarm is sounded. It is mainly used in dry fire extinguishing systems to separate the compressed gas in the water distribution network and the pressurized water in the water supply network. In the event of a fire, it automatically opens under the action of the pressure difference to start the system.

[0003] The working principle of a dry alarm valve is as follows: The dry alarm valve divides the system into a water supply side and a system side through the alarm disc. The water supply side is normally connected to firefighting equipment such as fire pumps and high-level fire water tanks. The system side is normally pressurized. In the quasi-operating state, pressurized gas on the system side and pressurized water on the water supply side maintain a balance of force between the alarm disc and the water supply side. When a fire occurs, the sprinklers on the system side burst, the system side begins to vent and decompress, reducing the pressure in the system chamber. The pressure on the water supply side exceeds that in the system chamber, disrupting the balance of the alarm disc and causing it to open. Once the alarm disc opens, water flows into the alarm pipe, causing the delay device to fill with water, triggering the pressure switch and hydraulic alarm, and activating the pressure switch-linked fire pump, providing a continuous supply of water and pressure for firefighting. Once the fire is extinguished, the dry system needs to be reset. The water on the system side pipes is drained, and the dry alarm valve reset mechanism is used to reset the disc. After the reset is complete, the system side is inflated, and a 50mm-100mm thick layer of clean water is injected into the alarm valve chamber to seal it.

[0004] During the actual use of the alarm valve, a system cavity is provided on the system side and is connected to the water injection pipe. The sealing between the system cavity and the water injection pipe may be loose due to material aging or water flow impact. Loose sealing may cause water leakage and insufficient pressure during the use of the alarm valve. The water flow rises slowly, and the insufficient water volume affects fire extinguishing. The problem cannot be discovered in time during maintenance, thereby affecting the fire extinguishing efficiency.

[0005] Therefore, new solutions need to be proposed to solve this problem. Utility Model Content

[0006] In view of the deficiencies in the prior art, the present invention aims to provide a dry type alarm valve.

[0007] The above technical objectives of the present utility model are achieved through the following technical solutions: a dry alarm valve, comprising a water supply pipe, a system cavity and a system pipe, the water supply pipe and the system pipe are respectively connected to the bottom and the top of the system cavity, the outer wall of the system pipe is fixedly connected to a water outlet pipe, the inner wall of the system pipe is provided with an opening, the opening is connected to the water outlet pipe, a rotating part rotatably connected to the inner wall of the system pipe is provided below the opening, the rotating part can cover the opening and form a seal with the inner wall of the system pipe after being flipped upward, if the water flow pressure is sufficient, the rotating part covers the opening, the water outlet pipe is in a waterless state, if the water flow pressure is insufficient, the rotating part cannot cover the opening, the water outlet pipe is in a water-containing state, and the water outlet pipe is connected to the outside world.

[0008] The utility model is further configured as follows: the rated pressure set in the system pipe is 1.2-1.5 MPa, and when the pressure in the system pipe is greater than 1.2 MPa, the rotating part flips upward.

[0009] The present invention is further configured as follows: a support rod is fixedly connected to the inner wall of the system pipe, and an end of the rotating member away from the rotating axis abuts against an end of the support rod away from the system pipe.

[0010] The utility model is further configured as follows: a sealing tube is sleeved on the system tube, the sealing tube is connected to the water outlet pipe, a gap is left between the sealing tube and the system tube, a cavity is provided in the gap, and the opening is connected to the cavity.

[0011] The utility model is further configured as follows: a rubber sleeve is fixedly connected to the surface of the rotating member that contacts the inner wall of the system pipe, and the gravity of the rubber sleeve and the rotating member is greater than the friction between the rubber sleeve and the inner wall of the opening.

[0012] The utility model is further configured as follows: a color-changing sheet is fixedly connected to the opening, and the color-changing sheet changes color when exposed to water.

[0013] The utility model is further configured as follows: a sensor for detecting whether there is water flow is fixedly connected to the outer wall of the water outlet pipe.

[0014] The utility model is further configured as follows: the rotating member, the support rod, and the opening are arranged in a circular array on the inner wall of the system pipe.

[0015] In summary, the present invention has the following beneficial effects: if the connection is well sealed and the pressure is sufficient, the water in the water supply pipe enters the system pipe when the alarm valve is used, and the impact force brought by the water flow can lift the rotating part, and the rotating part forms a seal with the inner wall of the system pipe. At this time, there is no water flow in the outlet pipe. If the sealing is insufficient and the pressure is insufficient, the water in the water supply pipe slowly flows into the system pipe when the alarm valve is used, and the thrust exerted by the water flow on the rotating part is insufficient to cause it to flip over, the opening is not sealed, and the water flows into the outlet pipe from the opening and is discharged to the outside, thereby being discovered, and conveying a signal of insufficient air tightness and insufficient pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 Schematic diagram of the cross-sectional structure of the sealing tube part.

[0018] In the figure: 1. Water supply pipe; 2. System cavity; 3. System pipe; 4. Sealing pipe; 5. Water outlet pipe; 6. Opening; 7. Cavity; 8. Color-changing piece; 9. Rotating part; 10. Support rod. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0020] A dry alarm valve, such as Figure 1-Figure 2 As shown, it includes a water supply pipe 1, a system cavity 2 and a system pipe 3. The water supply pipe 1 and the system pipe 3 are connected to the bottom and the top of the system cavity 2 respectively. The outer wall of the system pipe 3 is fixedly connected to the water outlet pipe 5. The inner wall of the system pipe 3 is provided with an opening 6, and the opening 6 is connected to the water outlet pipe 5. The inner wall of the system pipe 3 is located below the bottom surface of the opening 6. There is a rotating part 9 rotatably connected to the inner wall of the system pipe 3. The rotating part 9 can cover the opening 6 and form a seal with the inner wall of the system pipe 3 after turning upward. The water outlet pipe 5 is connected to the outside world. When the alarm valve is working normally, the pressure in the system pipe 3 is sufficient. After the alarm valve is opened, the water supply pipe 1 flows into the system cavity 2 and then into the system pipe 3. The pressure of the water flow is sufficient to lift the rotating member 9 to cover the opening 6. At this time, the water outlet pipe 5 is in a water-free state. When the alarm valve is not working, if the sealing between the system pipe 3 and the system cavity 2 is insufficient, air leakage and pressure relief will occur, which will cause the valve flap of the alarm valve to open in the non-working state. The insufficient airtightness causes the water flow entering the system pipe 3 to rise slowly. The pressure of the water flow is not sufficient to lift the rotating member 9, and the water flow flows into the water outlet pipe 5. The water outlet pipe 5 guides the water flow to the outside, thereby being discovered by people and conveying a signal of insufficient airtightness and insufficient pressure.

[0021] like Figure 1-Figure 2As shown, the rated pressure set in the system pipe 3 is 1.2~1.5MPa, and the pressure range of the dry alarm valve system will not be lower than 1.2MPa. This pressure value ensures that the system has sufficient pressure to drive the water flow and trigger the alarm under normal working conditions. When the pressure in the system pipe 3 is greater than 1.2MPa, the system side exhausts and releases pressure, and the pressure difference can drive the water to flow into the system pipe 3. The inner wall of the opening 6 is covered with a color-changing piece 8, and the color-changing piece 8 is coated with an indicator, which can change color when it comes into contact with water, and the color-changing piece 8 can allow water to flow through. The force brought by the rapid flow of water drives the rotating part 9 to flip upward and cover the color-changing piece 8. The cross-sectional area of ​​the opening 6 is consistent with the cross-sectional area of ​​the color-changing piece 8. When the rotating part 9 flips upward to cover the color-changing piece 8, it can completely cover the opening 6 and contact the inner wall of the system pipe 3. The side of the rotating part 9 in contact with the inner wall of the system pipe 3 A rubber sleeve is fixedly connected. Under the action of the force brought by the water flow, the rubber sleeve can better fit the inner wall of the system pipe 3 due to its good elasticity, thereby improving the fit between the rubber sleeve and the inner wall of the system pipe 3, thereby making the seal between the rotating part 9 and the inner wall of the system pipe 3 better. At this time, the color-changing piece 8 will not change color when exposed to water, and there is no water in the water outlet pipe 5. When the pressure in the system pipe 3 is less than 1.2MPa, the pressure is not enough to drive a large amount of water flow. The speed at which the water flows into the system pipe 3 will slow down. After slowly rising, the impact force on the rotating part 9 will become smaller, which is not enough to lift the rotating piece and cause it to flip over. The rotating piece will not cover the color-changing piece 8 on the opening 6, so the water can flow through the color-changing piece 8. After the water flows through the color-changing piece 8, the color of the water changes, and part of it flows into the water outlet pipe 5. The setting of the color-changing piece 8 makes the water flowing out of the outside more conspicuous and increases the timeliness of being discovered.

[0022] like Figure 1-Figure 2As shown, a support rod 10 is fixedly connected to the inner wall of the system pipe 3. The support rod 10 supports the rotating member 9 and the inner wall of the system pipe 3 to form an angle toward the water supply pipe 1. When there is no water flow in the system pipe 3, the end of the rotating member 9 away from the rotating axis is against the support rod 10. When there is water flow in the system pipe 3, the end of the rotating member 9 away from the rotating axis leaves the support rod 10. The setting of the support rod 10 causes the rotating member 9 to form a certain angle with the inner wall of the system pipe 3, which helps the impact of the water flow to lift the rotating member 9 and cause it to flip over. The sum of the gravity of the support rod 10 and the rotating member 9 is greater than the friction of the rubber sleeve, which reduces the inability of the rotating member 9 to naturally cover the opening 6 after it is lifted up to form a seal. To prevent the possibility of rotating back to the original position, a sealing tube 4 is sleeved on the system tube 3, and a cavity 7 is provided between the sealing tube 4 and the system tube 3. The cavity 7 is connected to the water outlet pipe 5 and the opening 6 at the same time. The rotating part 9, the opening 6, the support rod 10 and the color-changing piece 8 are all arranged in a circular array on the inner wall of the system tube 3, which can allow water to flow into the cavity 7 faster from the surrounding openings 6 and then merge into the water outlet pipe 5, thereby increasing the speed at which the water flows into the water outlet pipe 5, thereby increasing the water flow rate. The bottom surface of the cavity 7 is higher than the bottom surface of the water outlet pipe 5, which effectively reduces the accumulation of water flow and makes it impossible to merge into the water outlet pipe 5. At the same time, more water passes through the color-changing piece 8 to increase the degree of water color change, which is more likely to attract outside attention and thus improve detection efficiency.

[0023] Working principle: When the airtightness of the system pipe 3 and the system cavity 2 is good, the pressure is greater than 1.2MPa. When the alarm valve is working, the valve disc in the system cavity 2 opens, and the water flows into the system pipe 3 under the drive of pressure. The rotating part 9 is driven by the impact of the water flow to cause the rotating part 9 to flip upward, and then covers the color-changing piece 8 and the opening 6, and forms a seal with the inner wall of the system pipe 3. At this time, there is no water in the water outlet pipe 5, which conveys the signal that the alarm valve is working properly. When the alarm valve stops working, the airtightness of the connection between the system pipe 3 and the system cavity 2 is not enough, the air pressure becomes smaller, and the pressure is less than 1.2MPa, the pressure is insufficient to drive the alarm valve. In the dynamic water flow, the water rises slowly, and the impact force brought by the water flow cannot cause the rotating part 9 to flip over and stick to the inner wall of the system pipe 3, and it is even more impossible to form a seal between the rotating part 9 and the inner wall of the system pipe 3. The water flow eventually rises to the height of the opening 6 and enters the cavity 7 through the color-changing piece 8, and finally merges into the water outlet pipe 5. The water flow changes color when passing through the color-changing piece 8, making it easier to notice the water flow out of the outside world. At the same time, the sensor on the outer wall of the water outlet pipe 5 conveys a signal that there is water. The sealing tube 4 structure is arranged above the connection between the system pipe 3 and the system cavity 2, so that the insufficient pressure caused by the insufficient airtightness of the connection can be identified.

[0024] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A dry alarm valve, comprising a water supply pipe (1), a system chamber (2) and a system pipe (3), wherein the water supply pipe (1) and the system pipe (3) are connected to the bottom and the top of the system chamber (2), respectively, and characterized in that: A water outlet pipe (5) is fixedly connected to the outer wall of the system pipe (3); an opening (6) is provided on the inner wall of the system pipe (3); the opening (6) is connected to the water outlet pipe (5); a rotating member (9) is provided on the inner wall of the system pipe (3) below the bottom surface of the opening (6), and is rotatably connected to the inner wall of the system pipe (3); the rotating member (9) can cover the opening (6) and form a seal with the inner wall of the system pipe (3) after turning upward, and the water outlet pipe (5) is connected to the outside.

2. A dry alarm valve according to claim 1, characterized in that: The rated pressure set by the system in the system pipe (3) is 1.2-1.5 MPa. When the pressure in the system pipe (3) is greater than 1.2 MPa, the rotating part (9) turns upward.

3. A dry alarm valve according to claim 1, characterized in that: A support rod (10) is fixedly connected to the inner wall of the system pipe (3), and the support rod (10) supports the rotating member (9) to form an angle with the inner wall of the system pipe (3) toward the water supply pipe (1).

4. A dry alarm valve according to claim 1, characterized in that: A sealing tube (4) is sleeved on the system tube (3), the sealing tube (4) is connected to the water outlet tube (5), a cavity (7) is provided between the sealing tube (4) and the system tube (3), and the opening (6) is connected to the cavity (7).

5. The dry alarm valve according to claim 1, characterized in that: A rubber sleeve is fixedly connected to the surface of the rotating member (9) that contacts the inner wall of the system pipe (3), and the gravity of the rubber sleeve and the rotating member (9) is greater than the friction between the rubber sleeve and the inner wall of the opening (6).

6. The dry alarm valve according to claim 3, characterized in that: A color-changing sheet (8) is fixedly connected to the opening (6), and the color of the water changes after the water flows through the color-changing sheet (8).

7. The dry alarm valve according to claim 4, characterized in that: The bottom surface of the cavity (7) is higher than the bottom surface of the water outlet pipe (5).

8. The dry alarm valve according to claim 1, characterized in that: The rotating member (9), the supporting rod (10), and the opening (6) are arranged in a circular array on the inner wall of the system pipe (3).

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