JPH1182764A - Emergency flow passage switching valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accuracy, to allow direct installation to an aseismic water tank, and to reduce a loss factor by actuating the switching valve by simplifying and compactifying a switching valve and a simple linear motion. SOLUTION: An inlet port 2 of a valve casing 1, a first opening 3 normally connected to an aseismic water tank, a second opening 6 normally connected from the aseismic water tank to a discharge port 7, and a third opening 8 arranged concentrically with the first opening 3 and the second opening 6 so as to connect the inflow part 2 to the discharge port 8, are formed, and in the central part of each opening, a linear shaft body 9, to which a first valve element 11 opening the first opening 3, a second valve element 12 opening the second opening 6, and a third valve body 13 closing the third opening 8 are fixed, is arranged. In case of emergency, an internal pressure is detected, and the third opening 8 is opened while the first opening 3 and the second opening 6 are closed. The internal pressure is detectred by means of pilot valves 24, 25, while energizing force is applied to the rod body 9 by means of a coil spring 17 for maintaining the emergency time condition. Alternatively, the internal pressure is detected by means of a pressure sensor, and on the basis of an input signal from the pressure sensor, a motor is driven so as to actuate the rod body 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency flow path switching valve, and more particularly to an emergency flow path switching valve, which is connected to an earthquake-resistant water storage tank so that the water flow is always performed as a part of a water flow path, for example, when an earthquake occurs. The present invention relates to an emergency flow path switching valve capable of securing a certain amount of water by stopping water distribution and distribution to an earthquake-resistant water tank when a pipe rupture or the like occurs in an emergency.

[0002]

2. Description of the Related Art Conventionally, in order to construct the above-mentioned system, an inflow pipe and an exhaust pipe are connected to a seismic tank, and the inflow pipe and the discharge pipe are connected by a bypass pipe. Valves that are always open are provided for the inflow pipe and discharge pipe, and valves that are always closed are provided for the bypass pipe, so that water is normally passed into the seismic storage tank. By closing the valve of the discharge pipe and opening the valve of the bypass pipe, water flow to the seismic storage tank is stopped to secure a certain amount of water.

[0003]

However, the above-mentioned conventional system requires three valves,
Expenses including installation and maintenance are high, installation space is required, and adjustment work between valves is troublesome.

Focusing on this point, the applicant has developed and disclosed a rotary type switching valve in which the necessary flow path switching can be completed by an integral valve (Japanese Patent Application No. 8-157).
520).

[0005]

The object of the present invention is to make the above-mentioned switching valve simpler and more compact, and to operate it in a simple linear motion, thereby improving the precision, enabling direct attachment to an earthquake-resistant water tank, and a loss coefficient. It is an object of the present invention to provide an emergency flow path switching valve that can also reduce the size.

[0006]

In order to achieve this object, an emergency flow switching valve according to the present invention comprises an inlet of a valve box, a first opening communicating with an always seismic storage tank, A second opening communicating from the water storage tank to the outlet, and a third opening concentrically arranged with the first opening and the second opening and communicating the inlet and the outlet are formed, and a central portion of each opening described above. A linear valve body is provided, a first valve body that always opens the first opening, a second valve body that opens the second opening, and a third valve body that closes the third opening. In the event of an emergency, the internal pressure is detected, the third opening is opened, and the first and second openings are closed.The internal pressure is detected by a pilot valve, and the shaft is It is characterized in that a biasing force is given by a coil spring to maintain the time state, Knowledge is carried out by the pressure sensor,
The motor is driven by the input signal from the pressure sensor to operate the shaft.

[0007]

With the above construction, the inflow port, the discharge port and the first to third openings (flow ports) do not move, and each valve body is synchronized by one shaft. Only a simple linear movement is required, so the whole can be made smaller and can be directly attached to an earthquake-resistant water tank, making it a more sophisticated, malfunction-free, and economically advantageous product. You can.

[0008]

Next, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an emergency flow path switching valve embodying the present invention, FIG. 2 is a view showing a first pilot valve, FIG. 3 is a view showing a second pilot valve, and FIG. It is sectional drawing which shows the motor-driven emergency flow path switching valve as an Example.

In these figures, reference numeral 1 denotes a valve box. The valve box 1 is provided with an inlet 2 for water to which piping is connected, and the inlet 2 is always open. The first opening 3 communicates with the inlet 4 to an earthquake-resistant water storage tank (not shown).

In the figure, reference numeral 5 denotes an outlet for water from the above-mentioned seismic water storage tank. The outlet 5 is communicated with a second opening 6 which is always open, and is connected to a drain. It is connected to Exit 7.

The first opening 3 and the second opening 6 have the same diameter and are arranged linearly. At the intermediate position, a third opening 8 which is also arranged linearly with both, and is always in a closed state is provided. The first opening 3 and the second opening 6 are formed with a receiving taper 3a, 6a at the lower edge of the opening, and receive the action of a valve element described below from below, and the third opening 8 has a receiving taper 8a at the upper edge of the opening. It is formed and receives the action of the valve element described below from above.

On the other hand, reference numeral 9 in the figure denotes a shaft inserted through the centers of the first, second and third openings 3, 6, 8 described above. It is fitted into the provided receiving hole 10a to prevent swinging.

A first valve body 11 corresponding to the first opening 3 and a second valve body 12 corresponding to the second opening 6 are fixed to the shaft body 9 at the same distance from the openings 3 and 6, respectively. , This first valve body 1
1. When the second valve body 12 is in a position to stabilize the first opening 3 and the second opening 6 in the open state, the second valve body 12 is also coaxially fixed to the shaft body 9 and the first valve body 11 and the second valve body A third valve body 13 at an intermediate position of 12 closes the third opening 8 and forms a flow path interposing the above-mentioned seismic storage tank.

The shaft 9 extends through a housing 14 provided on an upper portion of the valve box 1 through a bearing 15. A coil spring 17 is resiliently provided in the housing 14 around the shaft 9 between the flange 15a of the bearing 15 and the seat 16 attached to the shaft 9. That is, the third opening 8 is opened, and the first opening 3 and the second opening 6 are opened.
It is biased in the closing direction.

Further, the receiving seat 16 is applied with pressure from above by an adjusting nut 18 screwed to a screw portion 9a formed on the shaft body 9 so that the urging force of the coil spring 17 can be adjusted.

On the housing 14, a cylinder chamber 19 is provided.
The upper end of the shaft 9 is inserted into the shaft 9, and a piston 20 is mounted on the upper portion of the shaft 9.

On the other hand, in the figure, reference numeral 21 denotes a first three-way valve for obtaining the water pressure at the inflow port 2 and the discharge port 7.
Provides water pressure to the upper and lower portions of the piston 20 in the cylinder chamber 19 through the second three-way valve 22 and the third three-way valve 23. Further, the first and second pilot valves 24, 25, it is assumed that water pressure is applied above and below the piston 20 in the present embodiment.

The first pilot valve 24 applies water pressure to the piston 20 by opening the valve port 24a when the water pressure (internal pressure), in particular, the water pressure at the inflow port 2 is larger than a set value, that is, at all times. By pushing down the body 9 against the urging force of the coil spring 17, its constant state is maintained. Then, in an emergency, when the water pressure falls below the set value, the valve port 24a is closed, the valve port 24b is opened, and the piston 2
This eliminates the application of pressure on zero. To adjust the set value for detecting an emergency, a force is applied from above by the adjusting nut 33 of the pilot valve 24 and the pressure adjusting spring 32
Adjust with.

The second pilot valve 25 acts symmetrically with the first pilot valve 24, and the operation can be achieved only by the first pilot valve 24. By operating the pilot valve 25 in an auxiliary manner, a more accurate operation can be achieved.

Further, in the figure, reference numeral 26 denotes a nut for restraining the piston 20. The nut 26 is attached to the lower end of the pin 27 and is always in contact with the center of the upper surface of the piston 20. The pin 27 protrudes upward from the cylinder chamber 19, and after sealing the water in the positioned packing box 29, moves the indicator 28 up and down.

The emergency flow path switching valve according to this embodiment is configured as described above. Here, the operation will be described. When the water pressure is higher than the set value, as shown in FIG. 1, the water is also circulating in the seismic water tank as a part of the flow path. Here, when an emergency such as a pipe rupture occurs due to the occurrence of an earthquake or the like, the water pressure decreases. When this drop in water pressure falls below a set value, the pilot valves 24 and 25 operate to stop supplying water pressure for holding down the piston 20. Then, the coil spring 17 acts to push the shaft body 9 upward, and the first opening 3 is closed by the first valve body 11 and the second opening 6 is closed by the second valve body 12, and at the same time, the third opening 8 is closed. The third valve body 13 that has been opened will open the third opening 8, and the flow path will be communicated directly from the inflow port 2 at the discharge port 7. Therefore, the supply of water to the seismic reservoir,
The discharge is stopped and a certain amount of water can be secured in the seismic reservoir.

FIG. 4 shows a second embodiment of the present invention. In this case, an electric type equipped with a motor M is used. Therefore, automatic reaction members such as a three-way valve, a pilot valve and a coil spring are used. Has been eliminated. In the figure, reference numeral 30 denotes a valve opening meter.

[0023]

The emergency flow switching valve according to the present invention is constructed and operates as described above. Therefore, first, the whole can be further reduced in size, and the stroke of the valve element can be reduced. Therefore, it is possible to use a small pipe and attach it directly to the seismic storage tank. In addition, the movement is simple, the pressure balance of the valve body is good, and the accuracy is high without being affected by external force. Further, the installation direction and form can be freely set, the structure is strong against foreign matters such as sand and small stones, and the loss coefficient can be small. Further, when the coil spring is used, the tightening force of the third valve body is increased, and the closed state can be maintained even if the pressure at the inflow and outflow ports is lost.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an emergency flow path switching valve embodying the present invention.

FIG. 2 is a diagram showing a first pilot valve.

FIG. 3 is a view showing a second pilot valve.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 2 Inlet 3 First opening 4 Inlet 5 Outlet 6 Second opening 7 Outlet 8 Third opening 9 Shaft 10 Lower cover 11 First valve 12 Second valve 13 Third valve 14 Housing DESCRIPTION OF SYMBOLS 15 Bearing 16 Receiving seat 17 Coil spring 18 Adjustment nut 19 Cylinder chamber 20 Piston 21 First three-way valve 22 Second three-way valve 23 Third three-way valve 24 First pilot valve 25 Second pilot valve 26 Suppression nut 27 Pin 28 Indicator 29 Packing box 30 Valve opening meter M Motor 31 Water pressure meter 32 Pressure adjustment spring 33 Adjustment nut

Claims (3)

[Claims] 1. An inflow port of a valve box, a first opening constantly communicating with a seismic reservoir, a second opening constantly communicating from the seismic reservoir to an outlet, and the first and second openings described above. Forming a third opening which is concentrically arranged and communicates the inflow port and the discharge port, and provides a linear shaft at the center of each of the above-mentioned openings,
A first valve body, which always opens the first opening, a second valve body, which opens the second opening, and a third valve body, which closes the third opening, are fixed to the shaft body. An emergency flow path switching valve that detects, opens a third opening, and closes a first opening and a second opening. 2. The emergency flow path switching according to claim 1, wherein the internal pressure is detected by a pilot valve, and an urging force is applied to the shaft by a coil spring to maintain an emergency state. valve. 3. The emergency flow path switching valve according to claim 1, wherein the internal pressure is detected by a pressure sensor, and an input signal from the pressure sensor drives a motor to operate a shaft body.