JPH0672061U - Flow detector - Google Patents

Abstract

(57) [Abstract] [Purpose] In a water flow detection device in which the valve seat consists of an inner valve seat and an outer valve seat, the inner valve seat and the outer valve seat are not on the same plane, or the valve body is mounted parallel to the valve seat. Water or air does not leak from the valve seat even if it is not closed. [Structure] A cylindrical inner valve seat 4 is slidably installed on an inner wall 9 on the primary side, and the inner valve seat 4 is pushed up by pressure water on the primary side to move the inner valve seat 4 to the position of the valve body 2. The structure is adapted to.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a running water detection device which detects an alarm or other signal when water that has been stopped during normal times flows.

[0002]

[Prior art]

 Generally, the running water detection device is used for dry sprinkler fire extinguishing equipment. A dry sprinkler fire extinguishing system is a sprinkler head installed at a fire location where water is not filled in the pipe where the sprinkler head is installed in normal times and water is made to flow only when a fire occurs. Is to spray water from.

Dry sprinkler fire extinguishing equipment is often used in cold regions. This is because, in wet sprinkler fire extinguishing equipment, when the pipe is always filled with water, the water in the pipe freezes and expands in cold regions in winter, and the pipe and sprinkler head are destroyed. .

In this dry type sprinkler fire extinguishing equipment, water is filled from the water source to the primary side of the running water detection device, and compressed air is introduced into the pipe where the sprinkler head is attached from the secondary side of the running water detection device. It is to be filled.

Therefore, when a fire occurs in a building where dry sprinkler fire extinguishing equipment is installed, first, a sprinkler head mounted near the place where the fire occurs operates to let out compressed air in the pipe from the sprinkler head. Then, the valve body in the flowing water detection device, which had closed the valve seat due to the strong pressure of the compressed air on the secondary side, has flowed out of the compressed air and reduced the pressure on the secondary side. It becomes higher and opens.

When water enters from the primary side to the secondary side, the air on the secondary side is pushed to activate a pressure switch connected to a water flow detection device to give an alarm, or to activate a pump of a water source to generate a large amount of water. The water is sent from the water source into the pipe and is sprinkled vigorously from the activated sprinkler head.

In general, the valve seat of the water flow detection device is formed with an annular groove (in which atmospheric pressure air is present) connected to an accelerator that adjusts the sensitivity of opening and closing the valve body. It has a double structure consisting of an outer side and an inner side, and in normal times these two valve seats were closed by a single valve body. In other words, in the water flow detection device, the outer valve seat prevents secondary air from entering the annular groove, and the inner valve seat prevents primary water from entering the annular groove. There is.

In the conventional flowing water detection device, the outer valve seat and the inner valve seat are on the same plane, and they are fixed.

[0009]

[Problems to be solved by the device]

 By the way, in the conventional water flow detection device, water on the primary side may enter the annular groove and air on the secondary side may enter the annular groove even when no fire has occurred in normal times. If this water or air enters the annular groove and reaches the accelerator, the function of the accelerator will be impaired and the opening / closing of the valve element of the water flow detection device will be delayed, or it will become too fast and normal water will flow from the sprinkler head. Will not be able to be sprayed.

Further, when the water on the primary side leaks from the valve body and the water pressure on the primary side decreases, the pump of the water source starts to increase the water pressure. Then, after the water pressure on the primary side rises to the specified pressure and the pump stops, and when water leaks from between the valve body and valve seat, the pump restarts. When the water leaks little by little like this, the pump has been repeatedly turned on and off all year round, which consumes unnecessary electricity and shortens the life of the pump.

The cause of the water leakage occurs when the outer valve seat and the inner valve seat are not completely in the same plane and cannot be closed by the valve body.

Even if the outer valve seat and the inner valve seat are on the same plane, the O-ring of the valve body that seals them is not installed on the same plane, or the valve body is mounted parallel to the valve seat. Water leakage may occur due to lack of time.

In order to prevent the leakage of water and air, the outer and inner valve seats must be completely flush with each other, or the valve body must be attached so as to be in complete contact with the valve seat. However, it is not only a great deal of work to precisely machine the outer and inner valve seats so that they are completely in the same plane, and to attach the valve bodies so as to be in close contact with these valve seats. Even if these could be satisfied, the valve seat and the valve element could be deformed by pressure and water or air could invade after a long time.

It is an object of the present invention to provide a flowing water detection device in which water on the primary side and air on the secondary side do not enter the annular groove without performing precision processing or mounting.

[0015]

[Means for Solving the Problems]

 The present inventor has found that in a water flow detection device having two valve seats, even if one valve seat is fixed, if the other valve seat has a degree of freedom, the valve body and the valve seat are always kept sealed. The present invention has been completed, focusing on the fact that

In the present invention, the valve seat has a double annular shape of an inner valve seat and an outer valve seat, and these valve seats are closed by a valve body to divide the inside of the main body into a primary side and a secondary side, In a flowing water detection device in which the primary side is filled with water and the secondary side is filled with air, the inner valve seat is made cylindrical, and the inner valve seat is slidably installed on the inner wall of the primary side, and It is a flowing water detection device characterized by having a structure in which the valve seat is pushed up by water pressure on the primary side.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A water flow detecting device of the present invention will be described below with reference to the drawings. 1 is a front sectional view of a flowing water detecting device of the present invention, FIG. 2 is an enlarged sectional view of a valve body and a valve seat of the flowing water detecting device of the present invention, and FIGS. 3 and 4 are inner valve seats of the flowing water detecting device of the present invention. FIG. 7 is an enlarged cross-sectional view of a main part for explaining a change in position.

The main body 1 of the water flow detection device is divided into a primary side A and a secondary side B by a valve body 2. The primary side A is filled with water under pressure, and the secondary side B is Is filled with compressed air.

The valve body 2 is designed to open in the direction of the arrow X, and in a normal state, it has two valve seats formed by sandwiching an annular groove 3 in the lower part of the main body 1, that is, an inner valve seat 4 and an outer valve seat 5. Is sealed. The valve body 2 is provided with an inner O-ring 6 and an outer O-ring 7 in order to improve the sealing condition with these valve seats.

The outer valve seat 5 is fixed, but the inner valve seat 4 can be moved slightly upward and downward in accordance with the state of the valve body 2.

Here, the structure of the inner valve seat will be described. The inner valve seat 4 has a cylindrical shape with a smooth seat surface on the upper side and an inner flange 8 on the lower side.

The inner valve seat 4 is slidably installed on a primary side inner wall 9 formed in the lower portion of the main body 1, and even if it slides between the inner valve seat 4 and the inner wall 9, it is watertight. An O-ring 10 is installed to improve the sex.

Inside the inner valve seat 4, a cylindrical stopper 11 having upper and lower outer flanges is installed. The lower flange 12 of the stopper 11 is connected to the lower portion of the main body 1, and the upper flange 13 is located above the inner flange 8 of the inner valve seat 4. The stopper 11 is provided with a plurality of holes 14 at substantially the same position as the space formed by the lower surface of the inner wall 9 and the lower surface of the inner valve seat 4.

Next, the movement of the inner valve seat in the water flow detection device of the present invention will be described. The outer O-ring 7 of the valve body 2 and the outer valve seat 5 are always in close contact with each other when they are not related to the inner valve seat. However, the outer O-ring 7 and the inner O-ring 6 of the valve body 2 may not be in the same plane unless the working state of the mounting portion of the O-ring or the mounting state of the valve body is accurate.

For example, when the inner O-ring 6 is at a higher level than the outer O-ring 7 as shown in FIG. 3, the inner valve seat 4 is lifted upward while being in close contact with the inner O-ring 6. (Arrow Y). The inner valve seat 4 is lifted by the pressure water on the primary side from the hole 14 formed in the stopper 10 to enter the space formed by the lower surface of the inner valve seat 4 and the lower surface of the inner wall 9 and apply pressure upward. Because.

Further, as shown in FIG. 4, when the inner O-ring 6 is mounted below the outer O-ring 7, the inner O-ring 6 prevents the inner valve seat 4 from being pushed up from below. Then, the inner valve seat 4 is pushed down below the outer O-ring installation level (arrow Z). Also at this time, since the inner valve seat 4 is pushed upward by the pressurized water on the secondary side, the upper surface of the inner valve seat and the inner O-ring are kept in close contact with each other, and the water on the primary side is allowed to flow out into the annular groove. There is no such thing.

[0027]

[Effect of device]

 The water flow detection device of the present invention is designed so that the outer valve seat and the inner valve seat and the inner valve seat that closely adheres to these valve seats are not exactly on the same plane, and the inner valve seat follows the closely contacted part of the valve body to move up and down. Since it is movable, it does not require accurate machining and mounting of the valve seat and valve body, so the machining cost and mounting cost are low, and it is economically advantageous. Since it can adapt to the deformation of the valve body mounting part, it has excellent reliability that water on the primary side never leaks.

[Brief description of drawings]

FIG. 1 is a front sectional view of a water flow detection device of the present invention.

FIG. 2 is an enlarged sectional view of a valve body and a valve seat of the water flow detection device of the present invention.

FIG. 3 is an enlarged cross-sectional view illustrating a state where the inner valve seat is raised in the water flow detection device of the present invention.

FIG. 4 is an enlarged cross-sectional view illustrating a state where the inner valve seat is lowered in the water flow detection device of the present invention.

[Explanation of symbols]

 1 Main body of water flow detection device 2 Valve body 3 Annular groove 4 Inner valve seat 5 Outer valve seat 6 Inner O-ring 9 Inner wall 11 Stopper 14 Hole

Claims (1)

[Scope of utility model registration request] 1. A valve seat has a double annular shape of an inner valve seat 4 and an outer valve seat 5, and these valve seats are closed by a valve body 2 to make the inside of the main body a primary side A and a secondary side B. In the flowing water detection device in which the primary side is filled with water and the secondary side is filled with air, the inner valve seat 4 is made cylindrical and the inner valve seat is slidable on the inner wall 9 on the primary side. A flowing water detection device that is installed and has a structure that pushes up the inner valve seat with water pressure on the primary side.