JP3232248U - Overpressure reflow device for fire alarm valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an overpressure reflow device for a fire alarm valve used in a sprinkler. SOLUTION: The fire alarm valve is used for adjusting the hydraulic pressure, and the fire alarm valve has a main valve 14b, a water supply flow path 11b, and a drainage flow path 12b. The overpressure reflow device includes a reflow table 20 installed in the main valve, and in the reflow table, in a reflow hole communicating with the water supply flow path and a drainage flow path communicating with each other. It has a communication hole, and a spring washer and a pressure adjusting ring are housed in the house. A hole is formed in the pressure adjusting ring, and the spring washer is driven by an elastic thrust urged by the spring to press contact with the pressure adjusting ring, and the overpressure liquid in the drainage flow path is brought into the water supply flow path. It is used to control the timing of circulation. The conventional fire alarm valve solves the problem that the valve opening is delayed because the hydraulic pressure in the drainage channel is higher than the hydraulic pressure in the water supply channel. [Selection diagram] Fig. 2

Description

The present invention relates to a fire alarm valve, and more particularly to an overpressure reflow device for a fire alarm valve.

The fire alarm valve is used to control the flow of liquid (fire extinguishing water, foam fire extinguishing agent) in the fire water supply pipe. The fire alarm valve is connected to a sprinkler, and when a fire occurs, the fire alarm valve is opened to open a large amount of liquid. Is continuously supplied to the sprinkler. Sprinklers inject liquid into the fire source to lower the temperature of the fire source, and also isolate the fire source from contact with oxygen to achieve a fire extinguishing effect.

The valve body 10a of the fire alarm valve of FIG. 1 has a main valve 14a, a water supply flow path 11a, and a drainage flow path 12a. The main valve 14a has a drainage flow path 12a in which the liquid in the water supply flow path 11a is discharged. It is used to control the flow in one direction toward the water, and one end of the drainage flow path 12a is connected to a sprinkler (not shown) via a fire water supply pipe 60a. The liquid enters the valve body 10a from the water supply flow path 11a and is drained from the valve body 10a by the drainage flow path 12a. Therefore, the water supply flow path 11a is the water supply end (that is, the primary side), and the drainage flow path 12a is the drainage end (that is, the secondary side).

When the sprinkler is activated (that is, liquid is injected), the liquid in the drainage channel 12a flows toward the sprinkler via the fire-fighting water supply pipe 60a, and the liquid in the drainage channel 12a decreases, causing a step-down phenomenon. Then, a pressure difference is generated between the water supply flow path 11a and the drainage flow path 12a. When the hydraulic pressure in the drainage channel 12a becomes lower than the hydraulic pressure in the water supply channel 11a, the main valve 14a is driven to open, and the liquid in the water supply channel 11a flows into the drainage channel 12a for fire fighting. It flows toward the sprinkler via the water supply pipe 60a.

However, in the above-mentioned conventional technique, the fire-fighting water supply pipe 60a belongs to the pressure discharge end, normally air bubbles are present inside, and under normal conditions (when the pressure is not released by the fire), heat is affected by the weather. Due to expansion and cooling contraction, internal pressure is generated in the drainage channel 12a, and the hydraulic pressure in the drainage channel 12a becomes higher than the hydraulic pressure in the water supply channel 11a. In the event of a fire, the main valve 14a of the fire alarm valve opens quickly to supply a large flow rate of liquid to the sprinkler. At this moment, the hydraulic pressure in the drainage channel 12a becomes higher than the hydraulic pressure in the water supply channel 11a, the main valve 14a does not operate quickly (that is, the valve is opened), and the hydraulic pressure in the drainage channel 12a is supplied with water. The main valve 14a cannot be opened unless the pressure becomes lower than the liquid pressure in the flow path 11a, the valve opening is delayed, the time for the sprinkler to inject the liquid is also delayed, and the fire source cannot be extinguished immediately. The loss from the fire increased.

Therefore, the present inventor considered that the above-mentioned drawbacks could be improved, and as a result of diligent studies, he came up with a proposal of the present invention to effectively improve the above-mentioned problems with a rational design.

The present invention has been developed in view of the above technical problems, and an object of the present invention is to provide an overpressure reflow device for a fire alarm valve. That is, in the conventional fire alarm valve, the hydraulic pressure on the secondary side in the drainage flow path becomes higher than the hydraulic pressure on the secondary side in the water supply flow path due to thermal expansion and cooling contraction, and the opening of the fire alarm valve is delayed. , The problem that the liquid on the primary side in the water supply channel cannot be quickly supplied into the drainage channel is improved.

In order to solve the above problems, the overpressure reflow device of the fire alarm valve of a certain aspect of the present invention is used to adjust the hydraulic pressure in the fire alarm valve, and the main valve and the main valve are contained in the fire alarm valve. It has a water supply flow path and a drainage flow path, and the main valve is used to control the liquid in the water supply flow path so as to flow in one direction toward the drainage flow path, and is used in the drainage flow path. An overpressure reflow device for a fire alarm valve that is driven to open the main valve when the hydraulic pressure is lower than the hydraulic pressure in the water supply flow path.
It is installed in the main valve, and a mounting channel that communicates between the water supply flow path and the drainage flow path is formed inside, and the mounting channel has a reflow hole and a reflow hole that communicates with the water supply flow path. A reflow table formed by communicating with each other the accommodating holes communicating with the drainage flow path, and having a hole diameter smaller than that of the accommodating hole.
A spring is loaded and movably accommodated in the accommodating hole to form a resistance surface and a reflow channel, and the reflow channel and the reflow hole communicate with each other with a spring washer.
A pressure adjusting ring that forms a crimping surface that can be pressure-welded to the resistance surface and a hole located at the center of the crimping surface, and the hole and the accommodating hole communicate with each other.
The pressure adjusting ring is installed in the accommodating hole, and the spring urges an elastic thrust so that the resistance surface of the spring washer comes into pressure contact with the crimping surface of the pressure adjusting ring, resulting in overpressure in the drainage flow path. It is used to control the timing at which the liquid flows through the accommodating hole and the hole in order to the reflow channel, the reflow hole, and the water supply flow path.

In the overpressure reflow device for a fire alarm valve according to the present invention, a neck portion and a pedestal are formed at both ends of the spring washer, a resistance surface is formed on the neck portion, and the diameter of the neck portion is smaller than the pedestal. A cavity is formed between the outer surface of the neck portion and the hole wall of the accommodating hole. The pedestal is formed with an accommodating groove used for loading the spring, and the neck portion is further formed with a cavity and at least one through hole communicating with the accommodating groove. The reflow channel is preferably formed by communicating the cavity, the through hole, and the accommodating groove.

In the overpressure reflow device for a fire alarm valve according to the present invention, the accommodating hole is formed in a screw hole form, the pressure adjusting ring is formed in a bolt form, and the pressure adjusting ring is located at an axial position of the accommodating hole. It is preferable that the equipment is installed in the accommodating hole in such an adjusted manner.

In the overpressure reflow device for the fire alarm valve according to the present invention, a check valve is fixed to the main valve, and the check valve is a valve seat and a valve plug movably installed in the valve seat. I have. The area of the valve hole controlled by the valve plug is smaller than that of the main valve, and the valve plug is used to control the liquid in the water supply flow path to flow in one direction toward the drainage flow path. The reflow table is preferably fixed to the valve seat and mounted on the main valve.

In the overpressure reflow device for the fire alarm valve according to the present invention, the check valve further includes a first flow path communicating with the water supply flow path and a second flow path communicating with the drainage flow path. It is preferable that the one flow path and the second flow path communicate with each other through the valve hole, and the reflow hole communicates with the first flow path.

According to the present invention, there are the following effects.
The overpressure reflow device is used to balance the hydraulic pressure in the water supply and drainage channels at both ends of the main valve (that is, to balance the hydraulic pressures on the secondary and primary sides) and in the drainage channel. Avoids the phenomenon that the liquid pressure on the secondary side becomes higher than the liquid pressure on the primary side in the water supply flow path due to thermal expansion and cooling contraction under the influence of the weather, and communicates with the firefighting water supply pipe in the event of a fire. Immediately lowers the hydraulic pressure on the secondary side in the drainage flow path until it becomes lower than the hydraulic pressure on the primary side in the water supply flow path according to the speed at which the liquid is discharged, and the main valve of the fire alarm valve is immediately activated. Open the valve. The valve opening is not delayed, a large amount of liquid on the primary side in the water supply flow path flows into the drainage flow path quickly and continuously, and the speed at which the liquid is supplied when the fire alarm valve opens increases, and the fire source Can be extinguished at high speed.

The description of the present specification and the drawings will clarify at least the following matters.

It is sectional drawing which shows the conventional fire alarm valve. It is sectional drawing which shows the overpressure reflow apparatus of the fire alarm valve which concerns on this invention which concerns on one Embodiment. It is a partial schematic enlarged view of FIG. It is the schematic which adjusts so that the pressure adjustment ring of FIG. 3 is located in the axial direction of the accommodating hole. It is a schematic view when the liquid in the drainage flow path of FIG. 3 pushes a spring base metal and enters a water supply flow path.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Needless to say, the present invention is not limited to the following examples, and can be arbitrarily changed without departing from the gist of the present invention.

First, FIG. 2 is a cross-sectional view showing an overpressure reflow device for a fire alarm valve according to the present invention according to an embodiment. The overpressure reflow device for the fire alarm valve according to the present invention is used for adjusting the hydraulic pressure in the fire alarm valve, and a water supply flow path 11b and a drainage flow path 12b are opened in the valve body 10b of the fire alarm valve. A valve port 13 is formed between the water supply flow path 11b and the drainage flow path 12b, and the liquid in the water supply flow path 11b flows into the drainage flow path 12b via the valve port 13. A main valve 14b for controlling the opening and closing of the valve port 13 is elastically installed in the valve body 10b so that the liquid in the water supply flow path 11b flows in one direction toward the drainage flow path 12b. It is used to control the valve. When the hydraulic pressure in the drainage flow path 12b is lower than the hydraulic pressure in the water supply flow path 11b, the main valve 14b is driven to open, and the liquid in the water supply flow path 11b passes through the valve port 13 and drains. It flows into the road 12b.

Next, the overpressure reflow apparatus will be described with reference to FIGS. 2 and 3. The overpressure reflow device includes a reflow stand 20, a spring washer 30, and a pressure adjusting ring 40.

The reflow stand 20 is mounted on the main valve 14b, and a mounting channel 21 communicating between the water supply flow path 11b and the drainage flow path 12b is formed in the reflow stand 20, that is, in the drainage flow path 12b. Liquid passes through the mounting channel 21 and circulates in the water supply flow path 11b. The mounting channel 21 is formed by communicating with each other the reflow hole 211 communicating with the water supply flow path 11b and the accommodating hole 212 communicating with the drainage flow path 12b, in other words, the drainage flow path 12b. The liquid inside passes through the accommodating hole 212 and the reflow hole 211 and flows into the water supply flow path 11b. The hole diameter of the reflow hole 211 is smaller than that of the accommodating hole 212.

The spring washer 30 is movably accommodated in the accommodating hole 212, the spring washer 30 is a circular pillar body, neck portions 31 and pedestals 32 are formed at both ends of the spring washer 30, and the pedestal 32 is formed in the reflow hole 211. It is aimed. The diameter of the neck portion 31 is smaller than that of the pedestal 32, a resistance surface 33 is formed on the neck portion 31, and a cavity 341 is formed between the outer surface of the neck portion 31 and the hole wall of the accommodating hole 212. The pedestal 32 is formed with an accommodating groove 342, and the neck portion 31 is further formed with at least one through hole 343 communicating with the cavity 341 and the accommodating groove 342. A reflow channel 34 is formed by communicating between the cavity 341, the through hole 343, and the accommodating groove 342, and the reflow channel 34 and the reflow hole 211 communicate with each other. In other words, after the liquid in the drainage channel 12b flows into the accommodating hole 212, it passes through the reflow channel 34 and flows toward the reflow hole 211, and then flows into the water supply channel 11b via the reflow hole 211. To do. Further, a spring 35 such as a spiral compression spring is loaded in the accommodating groove 342, the cross-sectional area of the accommodating groove 342 is wider than that of the reflow hole 211, and the spring 35 can come into contact with the outer circumference of the reflow hole 211. The elastic thrust is urged against 30.

The pressure adjusting ring 40 is installed in the accommodating hole 212, the spring washer 30 is located between the pressure adjusting ring 40 and the reflow hole 211, and the pressure adjusting ring 40 resists one side toward the spring washer 30. A crimping surface 41 that can be pressure-welded to the surface 33 and a hole 42 located at the center of the crimping surface 41 are formed, and the hole 42 and the accommodating hole 212 communicate with each other. In other words, the liquid in the drainage channel 12b flows into the accommodating hole 212, then passes through the hole 42 and flows into the reflow channel 34.

In a specific embodiment, the spring 35 urges an elastic thrust to bring the resistance surface 33 of the spring washer 30 into pressure contact with the crimping surface 41 of the pressure adjusting ring 40, closes the hole 42, and closes the liquid in the drainage flow path 12b. Is prevented from passing through the hole 42 and flowing into the accommodating hole 212. The laying area of the resistance surface 33 is larger than the diameter area of the hole portion 42 in practice, and the resistance surface 33 surely closes the hole portion 42.

Referring to FIG. 4, the accommodating hole 212 is formed in a screw hole form, the pressure adjusting ring 40 is formed in a bolt form, and the pressure adjusting ring 40 is adjusted so as to be located at an axial position of the accommodating hole 212. It is installed in the accommodation hole 212. Thereby, the elastic thrust of the spring 35 urging the resistance surface 33 of the spring washer 30 is adjusted, but this is not the case.

According to FIG. 5, the hydraulic pressure in the drainage flow path 12b is higher than the hydraulic pressure in the water supply flow path 11b, and the pressure difference between the two is urged on the resistance surface 33 of the spring seat 30. When it becomes larger than the elastic thrust, the spring seat 30 is pushed by the liquid in the drainage flow path 12b, the resistance surface 33 is separated from the crimping surface 41, the closed hole 42 is opened, and the resistance surface 33 is crimped. A gap 36 is formed between the surface and the surface 41, and the liquid in the drainage flow path 12b passes through the accommodating hole 212, the hole 42, and the gap 36 and flows into the cavity 341, and the cavity 341, the through hole 343, and the like. It passes through the reflow channel 34 formed by communicating between the accommodating groove 342 and the accommodating groove 342, flows toward the reflow hole 211, circulates in the water supply flow path 11b via the reflow hole 211, and flows into the drainage flow path 12b. The hydraulic pressure inside and the hydraulic pressure inside the water supply flow path 11b are brought into an equilibrium state.

Further, a check valve 50 provided with a valve seat 51 may be fixedly installed in the main valve 14b, and a first flow path 54 and a drainage flow path communicating with the water supply flow path 11b are provided in the valve seat 51. A second flow path 55 communicating with 12b is opened, and a valve hole 53 is formed between the first flow path 54 and the second flow path 55. The liquid in the first flow path 54 flows into the second flow path 55 via the valve hole 53, and a valve plug 52 for opening and closing the control valve hole 53 is movably installed in the valve seat 51. There is. The valve plug 52 is used to control the liquid in the first flow path 54 to flow in one direction toward the second flow path 55, and the cross-sectional area of the valve hole 53 is narrower than that of the valve port 13. In other words, the flow rate when the liquid passes through the valve hole 53 is smaller than the flow rate when the liquid passes through the valve port 13. In practice, the reflow stand 20 is fixedly fixed in the radial direction of the valve seat 51 and mounted on the main valve 14b, and the reflow hole 211 communicates with the first flow path 51. In other words, the liquid in the drainage flow path 12b passes through the accommodating hole 212, the hole portion 42, the reflow channel 34, the reflow hole 211, and the first flow path 51, and circulates in the water supply flow path 11b.

The above description is for explaining the present invention, and should not be construed as limiting or limiting the scope of the invention described in the claims for utility model registration. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made within the technical scope described in the scope of claims for utility model registration.

10a Valve body 10b Valve body 11a Water supply flow path 11b Water supply flow path 12a Drainage flow path 12b Drainage flow path 13 Valve port 14a Main valve 14b Main valve 20 Reflow stand 21 Mounting channel 211 Reflow hole 212 Storage hole 30 Spring seat 31 Neck portion 32 Pedestal 33 Resistance surface 34 Reflow channel 341 Cavity 342 Accommodation groove 343 Through hole 35 Spring 36 Gap 40 Pressure adjustment ring 41 Crimping surface 42 Hole 50 Check valve 51 Valve seat 52 Valve plug 53 Valve hole 54 First flow path 55 Second flow Road 60a Firefighting water supply pipe 60b Firefighting water supply pipe

Claims (5)

It is used to adjust the hydraulic pressure in the fire alarm valve, and the fire alarm valve has a main valve, a water supply flow path, and a drainage flow path, and the main valve is the liquid in the water supply flow path. Is used to control the flow in one direction toward the drainage channel, and when the hydraulic pressure in the drainage channel is lower than the hydraulic pressure in the water supply channel, the main valve is driven to open. It is an overpressure reflow device for fire alarm valves.
Installed in the main valve, a mounting channel communicating between the water supply flow path and the drainage flow path is formed inside, and the mounting channel has a reflow hole and a reflow hole communicating with the water supply flow path. A reflow table formed by communicating with each other the accommodating holes communicating with the drainage flow path, and the hole diameter of the reflow hole is smaller than that of the accommodating hole.
A spring is loaded and movably accommodated in the accommodating hole to form a resistance surface and a reflow channel, and the reflow channel and the reflow hole communicate with each other with a spring washer.
A pressure adjusting ring that forms a crimping surface that can be pressure-welded to the resistance surface and a hole located at the center of the crimping surface, and the hole and the accommodating hole communicate with each other.
The pressure adjusting ring is installed in the accommodating hole, and the spring urges an elastic thrust so that the resistance surface of the spring washer comes into pressure contact with the crimping surface of the pressure adjusting ring, resulting in overpressure in the drainage flow path. An overpressure reflow device for a fire alarm valve, characterized in that it is used to control the timing at which a liquid flows through the accommodating holes and the holes in order to the reflow channel, the reflow hole, and the water supply flow path. A neck portion and a pedestal are formed at both ends of the spring washer, the resistance surface is formed on the neck portion, the diameter of the neck portion is smaller than that of the pedestal, and the outer surface of the neck portion and the hole of the accommodating hole are formed. A cavity is formed between the wall and the pedestal, an accommodating groove used for loading the spring is formed in the pedestal, and at least one accommodating groove communicating with the cavity and the accommodating groove is formed in the neck portion. The overpressure reflow apparatus for a fire alarm valve according to claim 1, wherein a through hole is further formed, and the reflow channel is formed by communicating the cavity, the through hole, and the accommodating groove. .. The accommodating hole is formed in the form of a screw hole, the pressure adjusting ring is formed in the form of a bolt, and the pressure adjusting ring is installed in the accommodating hole in a form adjusted so as to be located at an axial position of the accommodating hole. The overpressure reflow device for a fire alarm valve according to claim 1, wherein the overpressure reflow device is provided. A check valve is fixed to the main valve, and the check valve is provided with a valve seat and a valve plug movably installed in the valve seat, and the area of the valve hole controlled by the valve plug. Is narrower than the main valve, the valve plug is used to control the liquid in the water supply flow path to flow in one direction toward the drainage flow path, and the reflow table is fixed to the valve seat. The overpressure reflow device for a fire alarm valve according to any one of claims 1 to 3, wherein the main valve is equipped with the overpressure reflow device. The check valve further includes a first flow path communicating with the water supply flow path and a second flow path communicating with the drainage flow path, and the first flow path and the second flow path have the valve hole. The overpressure reflow device for a fire alarm valve according to claim 4, wherein the reflow holes communicate with each other through the first flow path.

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