JP2008008352A - Flowing water detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flowing water detecting device for preventing the wear of the intake of the flowing water detecting device and damage thereto by using a float valve element in the intake for opening/closing the intake while utilizing the buoyancy of water supplied to a secondary side. <P>SOLUTION: The flowing water detecting device is used in a dry or pre-actuated sprinkler installation which is opened/closed at its primary side 3 and at its secondary side 4 with a control valve 1, for detecting the flow of water in a pipe with water pressure introduced from the intake 11 in the opened condition of the control valve 1. The control valve 1 is a butterfly valve, and the intake 11 is opened in a valve chest on the secondary side 4 upward in the vertical direction. A float valve element 10 is provided in the intake 11. The float valve element 10 is moved up with the buoyancy during opening the control valve 1 to open the intake 11 and moved down with the dead weight during closing it to close the intake 11. The float valve element 10 opens/closes the intake 11 with the buoyancy of water supplied to the secondary side 4, therefore eliminating the need for a valve element 2 of the control valve 1 to abut on the intake 11. This prevents the wear of the valve element 2 around the intake 11 in contact therewith and damage thereto and less restricts the installation position of the intake 11 to simplify the construction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flowing water detection device used in a fire extinguishing sprinkler facility.

  In general, the water flow detection device used for fire extinguishing sprinkler equipment is installed in the middle of a pipe leading to the sprinkler head installed on the ceiling of the building, and the sprinkler equipment is activated by detecting the water flowing in the pipe. The purpose is to send a predetermined alarm indicating that the user is doing.

For example, Patent Document 1 discloses a technique of a flowing water detection device used in a sprinkler facility called a dry type.
In dry sprinkler equipment, a gas such as pressurized air is filled on the secondary side and water is filled on the primary side across a valve device provided in the middle of the pipe leading to the sprinkler head. Further, the sprinkler head is provided with a heat sensitive part and is sealed at room temperature.
When a fire occurs and the heat sensitive part melts with heat, the sealed part is opened and the secondary air is released. Due to the decrease of the atmospheric pressure on the secondary side, the valve device provided in the middle of the pipe opens, and water is supplied from the primary side to the secondary side, and water discharge is started.
At this time, the flow path of the flowing water detection device closed by the valve body of the valve device is opened, and the water pressure acts on the alarm device through the flow channel. When the water pressure acts on the alarm device, a predetermined alarm indicating that running water is generated in the pipe is issued.
JP 2003-305137 A

The flowing water detection device is also used in a sprinkler facility called a pre-actuated type.
In the pre-actuated sprinkler equipment, a gas such as pressurized air is filled on the secondary side and water is filled on the primary side across the control valve. The sprinkler head is similarly provided with a heat sensitive part.
When a sensor provided separately from the sprinkler head detects the occurrence of a fire, the control valve is opened, the heat sensitive part of the sprinkler head is melted, the seal is opened, and water discharge is started.
Thus, water discharge is started by simultaneously opening the control valve and opening the seal of the heat sensitive part, and prevents erroneous water discharge due to malfunction of the device (for example, Patent Document 2, (See Patent Document 3).
JP-A-6-79014 Japanese Utility Model Publication No. 2-35760

In the dry sprinkler facility and the pre-actuated sprinkler facility, the water intake of the water flow detection device is provided to open to the valve seat of the control valve. The intake port is closed when the valve body of the control valve comes into contact with the valve seat, and the intake port is opened when the valve body of the control valve is separated from the valve seat.
For this reason, when a valve body and a valve seat repeat contact and separation, the valve seat around the water intake may be worn out or damaged. If the valve seat or the valve body around the water intake is worn or damaged, the water intake cannot be closed in a watertight manner, and this causes a malfunction of the water flow detector.

  Then, this invention makes it a subject to prevent abrasion and damage of the water intake of a flowing water detection apparatus.

  In order to solve the above problems, the present invention is used in a dry or pre-actuated sprinkler facility in which a primary side and a secondary side of a pipe are opened and closed by a control valve, and the inside of the pipe is opened when the control valve is open. In the water flow detection device for detecting the flow of water in the pipe by the water pressure introduced from the water intake opening in the pipe, the water intake port is opened vertically upward in the valve chamber on the secondary side, and a float valve body is formed in the water intake port. The float valve body is lifted by buoyancy from the water charged to the secondary side when the control valve is opened to open the intake port, and is lowered by its own weight when the control valve is closed. A structure that closes the intake is adopted.

  Since the float valve body is provided at the intake port of the water flow detection device opened upward in the valve chamber on the secondary side, when the control valve is opened and water is supplied from the primary side to the secondary side, the float valve body Rises due to the buoyancy received from the water supplied to the secondary side and opens the water intake. When the control valve is closed and there is no water on the secondary side, the float valve body is lowered by its own weight and closes the water intake.

By adopting the float valve element, the intake port is opened and closed by utilizing the buoyancy of the water supplied to the secondary side, so there is no need to bring the valve element of the control valve into contact with the water inlet. For this reason, wear and damage around the intake port due to contact with the valve body can be prevented.
Further, since there is no need to bring the valve body of the control valve into contact with the water inlet, the water inlet may be provided at a position away from the valve body of the control valve and the valve seat. Thus, since the restriction of the installation position of the intake port is reduced, the structure of the control valve can be simplified.

  Furthermore, by adopting the float valve body, it is possible to open and close the water intake port of the water flow detector regardless of the configuration of the valve body of the control valve. For this reason, it becomes possible to employ a butterfly valve as a control valve of a dry or pre-actuated sprinkler facility. The butterfly valve is advantageous because it is more compact than a swing valve or a ball valve.

In general, a butterfly valve has a large area where the valve body and the valve seat do not come into surface contact like a swing valve or a ball valve. For example, as shown in FIG. The seat ring 8 and the valve seat 7 provided around the valve hole are annularly contacted in a region w having a narrow width (width in the tube axis direction), and the primary side and the secondary side are contacted by the contact in the narrow region w. Watertightness is maintained. Since the width of the contact region w between the seat ring 8 and the valve seat 7 is narrow, even if the intake port is opened in the valve seat 7 in the region w, the intake port is closed or opened as the valve body 2 opens and closes. It is difficult to do. This is because the width of the contact area w is close to or smaller than the inner diameter of the water intake port.
Therefore, by adopting the float valve body, it is possible to open and close the intake port of the water flow detection device regardless of the configuration of the valve body of the control valve, so that a more compact butterfly valve can be employed. .

This invention employs a float valve body at the intake port of the water flow detection device and uses the buoyancy of water supplied to the secondary side to open and close the intake port, so the valve body of the control valve is used as the water intake port. There is no need to abut. For this reason, wear and damage around the intake port due to contact with the valve body can be prevented.
Further, since it is not necessary to bring the valve body of the control valve into contact with the water inlet, restrictions on the installation position of the water inlet are reduced. For this reason, the structure of the control valve can be simplified.

An embodiment will be described with reference to the drawings. The flowing water detection device of this embodiment is employed in a pre-acting fire extinguishing sprinkler facility.
The configuration is such that a butterfly valve type control valve 1 is provided in the middle of a pipe leading to a sprinkler head installed on a ceiling or the like in a building. Pressurized air is supplied to the secondary side 4 across the control valve 1 and water is supplied to the primary side 3 at a predetermined water pressure. Further, the sprinkler head is provided with a heat sensitive part that melts at a predetermined temperature, and the heat sensitive part hermetically seals the inside of the pipe on the secondary side 4 at room temperature.

  In addition to the sprinkler head, a sensor is also installed on the ceiling or the like. When this sensor detects the occurrence of a fire, the valve body 2 of the control valve 1 is opened. Also, in the event of a fire, the heat sensitive part of the sprinkler head melts at the same time and the seal is opened, so that the water that has flowed into the secondary side 4 by the opening of the control valve 1 is used as the air filled in the secondary side 4. As it is pushed out, water discharge begins.

  In the flowing water detection device, when the control valve 1 is opened and water flows from the primary side 3 to the secondary side 4 of the pipe, the flowing water generated in the pipe is shown in FIGS. 3 (a) and 3 (b). The alarm pressure switch 30 is detected, and a predetermined alarm indicating that the sprinkler facility is operating is transmitted.

  A water intake pipe 31 leading to the alarm pressure switch 30 is connected to a water intake pipe 15 communicating with the valve chamber on the secondary side 4 in the valve box 5. The intake pipe 15 communicates with the valve chamber 12 for the float valve body 10 provided in the valve chamber on the secondary side 4 at the intake port 11 at the upper end. The water intake 11 opens vertically upward in the valve chamber 12.

The float valve body 10 is accommodated in the valve chamber 12, and when there is no water in the valve chamber of the secondary side 4, the float valve body 10 comes into contact with the entire periphery of the water intake 11 by its own weight and closes the water intake 11. (See FIG. 3 (a)). Further, when water is supplied into the valve chamber of the secondary side 4, the float valve body 10 is lifted by the buoyancy received from the water and is separated from the water intake 11 to open the water intake 11 (FIG. 3B). )reference). In addition, as shown in FIG. 2, if the float presser 12a is provided in the opening part to the valve chamber side of the secondary side 4 of the valve chamber 12, the fall of the float valve body 10 can be prevented. The float retainer 12a can be easily attached and detached if it can be screwed into the valve box 5 and fixed.
Thus, since the water intake 11 is opened in the pipe only when the control valve 1 is open, water pressure is introduced into the alarm pressure switch 30 only when the sprinkler facility is operated.

The detection of the flowing water by the alarm pressure switch 30 is based on the water pressure introduced from the intake port 11 through the intake pipes 15, 31 and the branch pipe 33, in a state where there is no flowing water in the pipe and in a state where the flowing water is generated. The presence or absence of the flowing water can be detected based on the difference from the water pressure.
In the figure, "32" is an orifice for ensuring the action of water pressure on the alarm pressure switch 30, "38" is a discharge port for discharging water that has passed through the orifice, and "33a" is a signal stop. It is a valve. “34” is a pressure gauge intake pipe leading to the secondary pressure gauge 34b, and “34a” is a gauge valve. Further, reference numeral “36” is a pressure gauge intake pipe leading to the primary pressure gauge 37, “36a” is a gauge valve, “35” is a communication pipe, and “35a” is a test valve.

  Further, the control valve 1 includes a pressure switch 40 for depressurizing alarm that operates based on the water pressure on the primary side 3 and the water pressure on the secondary side 4. As shown in FIG. 3, the pressure reducing alarm intake pipes 41 and 42 drawn from the primary side 3 and the secondary side 4 through the on-off valves 41a and 42a are connected by a communication pipe 44, respectively. One of the communication pipes 44 communicates with the pressure reducing alarm pressure switch 40 via the branch pipe 43 and the signal stop valve 43a, and the other communicates with the discharge port 46 via the discharge pipe 45 and the discharge valve 45a.

As shown in FIG. 7B, the butterfly valve is closed in a state (solid line state) slightly before the surface direction of the valve body 2 is perpendicular to the pipe axis direction of the pipe (chain line state). Operation may stop. For this reason, when a water intake as shown in the figure is provided, in the state shown by the solid line, the water intake of the water flow detection device is not blocked even though the valve hole of the control valve is closed, There may be situations where the alarm device does not operate normally.
However, by adopting a float valve body that opens the intake port 11 vertically upward in the valve chamber of the secondary side 4 and that can open and close the intake port 11, the position of the valve body 2 is in the chain line state and the solid line state. In any case, the water intake 11 can be reliably closed if water is not supplied to the secondary side 4.
Further, by closing the intake port 11 by the float valve body 10, the gas pressure such as air filled in the secondary side 4 does not act on the pressure switch 30 (intake pipe 15), and only the atmospheric pressure can always be worked, and In addition, leakage of gas on the secondary side 4 and air inflow from the outside can be prevented.

  In the embodiment shown in FIG. 4, a water intake pipe unit 16 having a water intake 11 and a valve chamber 12 for housing the float valve body 10 is provided in a portion facing the valve chamber on the secondary side 4 of the valve box 5. It is inserted into the through hole 17 in the tube diameter direction and joined. The valve chamber 12 formed by the intake pipe unit 16 communicates with the valve chamber on the secondary side 4 and is integrated, and the intake port 11 is integrated with the valve chamber on the secondary side 4. It opens vertically upward. The intake pipe 15 is connected to the intake port 11 of the intake pipe unit 16.

In addition, although the said embodiment applies the flowing water detection apparatus of this invention to the pre-operation type sprinkler equipment, it is applicable also to a dry-type sprinkler equipment.
When the flowing water detector of the present invention is applied to a dry sprinkler facility that is not pre-actuated, the pressure change on the secondary side 4 due to the opening of the sprinkler head is detected, and the power of the spring spring is detected by the detection signal, for example The structure etc. which open | release and operate the valve body 2 in the valve opening direction can be considered.

  Yet another embodiment is shown in FIGS. FIG. 5 shows a control valve 1 using a swing valve that employs the flowing water detection device having the above-described configuration. FIG. 6 employs a flowing water detection device having the above-described configuration for the control valve 1 using a ball valve. Since the operation and effect are the same as those of the above embodiments except for the opening / closing mechanism of the valve body, description thereof will be omitted.

1 shows an embodiment, (a) is a front view, (b) is an xx cross-sectional view of (a). Enlarged view of the main part of FIG. Explanatory drawing which shows the effect | action of a flowing water detection apparatus The principal part enlarged view which shows other embodiment. Front view showing still another embodiment Front view showing still another embodiment Main part enlarged view of the conventional example

Explanation of symbols

1 Control valve 2 Valve body 3 Primary side (primary side valve chamber)
4 Secondary side (secondary valve chamber)
5 Valve box 6 Valve shaft 7 Valve seat 8 Seat ring 9 Stopper 10 Float valve body 11 Water intake port 12 Valve chamber 15 Water intake pipe 16 Water intake pipe unit 17 Through hole 30 Alarm pressure switch 31 Water intake pipe 32 Orifice 33, 43 Branch pipe 33a , 43a Signal stop valve 34, 36 Pressure gauge intake pipe 34a, 36a Gauge valve 34b Secondary side pressure gauge 35 Communication pipe 35a Test valve 37 Primary side pressure gauge 38 Discharge port
40 Pressure switch for pressure reduction alarm 41, 42 Water intake pipe for pressure reduction alarm 41a, 42a Open / close valve 44 Communication pipe 45 Drain pipe 45a Drain valve 46 Drain

Claims (2)

Used in a dry or pre-actuated sprinkler facility that opens and closes the primary side 3 and the secondary side 4 of the pipe by the control valve 1, and is introduced from a water intake 11 that opens into the pipe when the control valve 1 is open. In the flowing water detection device that detects the flow of water in the pipe by the water pressure
The intake port 11 is opened vertically upward in the valve chamber of the secondary side 4, and a float valve body 10 is provided in the intake port 11, and the float valve body 10 is connected to the secondary side 4 when the control valve 1 is opened. The water flow detection device is characterized in that the water intake 11 is lifted by buoyancy from the water filled in the water and the water intake 11 is opened, and the water intake 11 is lowered by its own weight when the control valve 1 is closed.   The water flow detection device according to claim 1, wherein the control valve 1 is a butterfly valve.

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