JPH0663174A - Sprinkler connecting joint - Google Patents

Abstract

PURPOSE:To provide a sprinkler connecting joint with which a sprinkler can readily be connected to a water supply pipe in a home in general, and which can prevent water from being trapped in the vicinity of a sprinkler head not only when water flows through the water supply pipe incorporating the sprinkler but also when water is drained from the water supply pipe, so as to eliminate the necessity of an electrical heating wire for keeping warm in a cold district. CONSTITUTION:A check valve 30 including a valve element 31 for preventing fluid from counterflowing from a conduit 40 connected thereto with a sprinkler head 50, into a joint pipe 20 constituting a sprinkler connecting joint 10, is provided in a part connecting between the joint pipe 20 and the conduit 40. The valve element 31 in the check valve 30 is adapted to block water from flowing into the conduit 40 by the fluid pressure of flame-resistant gas charged in the interior space 41 of the conduit 40, overcoming the pressure of water in the joint pipe 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a joint pipe, which is inserted in the middle of a water pipe, and a body pipe for mounting a sprinkler head, which normally has a water spray hole closed and opens in a fire to spray water. Regarding sprinkler connection fittings.

[0002]

2. Description of the Related Art As a conventional sprinkler connecting joint of this type, there is one corresponding to Utility Model Registration No. 1417489.

That is, a guide rib is provided on the inner wall of the downward water passage connected to the sprinkler head so that accumulated water (dead water) will not be generated even if the sprinkler head is directly attached to the water pipe of a general household. The water flowing into the water passage of the sprinkler connection joint is guided by the guide ribs near the end of the downward water passage where stagnant water (dead water) is likely to occur, so the water flow does not generate stagnant water. Runs out of the waterway.

[0004]

However, in such a conventional sprinkler connection joint, even if it is necessary to temporarily drain water from the water pipe to prevent freezing at night in cold regions, the downward direction of the sprinkler connection joint. Water will remain near the end of the canal. In such a cold area, if residual water freezes, the sprinkler connection joint may be damaged due to its volume expansion.Therefore, it is necessary to install a heating wire for heat insulation to prevent residual water from freezing, and the number of man-hours for installing the sprinkler is reduced. There is a problem that it becomes complicated and the equipment cost increases.

The present invention has been made by paying attention to such a conventional problem. Even if the water is drained from the water pipe, the water does not remain in the vicinity of the sprinkler head and the heating wire for keeping heat for preventing freezing. Since it is not necessary to install the sprinkler, it is possible to easily install a sprinkler on general water pipes even in cold regions.
It is an object of the present invention to provide a sprinkler connection joint that can reduce equipment costs.

[0006]

[Means for Solving the Problems] The gist of achieving the above-mentioned object is as follows: (1) a joint pipe inserted in the middle of a water supply pipe and a sprinkler which normally sprinkles water by opening a water spray hole and sprinkling water during a fire. In a sprinkler connection joint formed by connecting a head pipe and a body pipe, one end of the body pipe is connected between a water inlet and a water outlet of the joint pipe, and the body is connected to the joint portion. A check valve having a valve body for preventing the reverse flow of the fluid from the inside of the pipe to the inside of the joint pipe is provided, and the valve body of the check valve is provided in the body pipe between the valve body and the sprinkler head attached to the other end of the body pipe. A sprinkler connection joint, which is provided so as to block the intrusion of water into the body tube against the water pressure in the joint tube by the fluid pressure of the enclosed non-combustible gas.

2. At least one pair of sensor electrodes are provided so as to project from the outside to the inside of the body tube so that the water that enters the body tube is splashed, and the sensor electrodes are arranged in close proximity so that the invading water is continuous. The sprinkler connection joint according to item 1 exists.

[0008]

[Function] To install the sprinkler, the sprinkler connection joint pipe is inserted in the middle of the water pipe, while the sprinkler head is attached to the other end of the trunk pipe. Can be installed.

A check valve provided at a connection point between the joint pipe and one end of the body pipe and a sprinkler head attached to the other end of the body pipe closes the body pipe to a pressure sufficient to withstand water pressure in the joint pipe. Fill non-combustible gas with. The sprinkler head sprinkler holes are normally closed.

The fluid pressure of the non-combustible gas sealed in the body pipe urges the valve body of the check valve, which prevents backflow of fluid from the body pipe into the joint pipe, in a direction to close the water from the joint pipe into the body pipe. Is blocked. The check pipe and the joint pipe of the sprinkler connection joint are connected to the water pipe by a check valve so that there is no downward depression.

In a state where water is flowing from the water inlet to the water outlet of the joint pipe inserted in the middle of the water pipe, water does not enter the joint pipe from the joint pipe, and the water does not stagnate in the pipe. No accumulated water (dead water) is generated in the sprinkler connection joint.

In cold regions, especially in the nighttime, the water in the water pipe freezes, the expansion of the volume may damage the water pipe, or the water may become unusable due to freezing of the water.
Although it is necessary to temporarily drain water from the water pipe with the sprinkler installed when sleeping, etc., the water will not enter into the body pipe from the joint pipe side. You can drain water from it.

Accordingly, it is not necessary to dispose a heating wire for heat retention for preventing freezing of residual water in the vicinity of the sprinkler connection joint, and the sprinkler can be easily installed in a water pipe of a general household even in cold regions.

When a fire occurs while the water supply pipe is filled with water, the sprinkler head sprinkler holes open, and the non-combustible gas sealed in the body pipe escapes from the sprinkler head. Thereby, the valve body of the check valve is opened, the water in the joint pipe passes through the check valve and enters the body pipe, and water is sprinkled from the sprinkler head sprinkling holes.

Such a sprinkler connecting joint can be easily installed in water pipes of general households other than the cold district where it is necessary to temporarily drain water from the water pipe in which the sprinkler is installed to prevent freezing.

In the case where the sensor electrodes projecting from the outside to the inside of the body tube are provided, when water that has entered the body tube through the check valve from the joint tube is applied to at least a pair of sensor electrodes, the water will pass through the water. At least a pair of sensor electrodes conduct,
Thereby, watering can be detected.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention. As shown in FIG. 3, a water pipe 1 is arranged along a ceiling A1 of a room A, and a water tap 2 is provided at an end of the water pipe 1. A sprinkler connection joint 10 is interposed in a portion of the water pipe 1 along the ceiling A1, and a sprinkler head 50 is attached to the sprinkler connection joint 10.

As shown in FIG. 1, the sprinkler connecting joint 10 is formed by connecting a joint pipe 20 provided in the middle of a water pipe 1 to a body pipe 40 on which a sprinkler head 50 is mounted. It is what constitutes.

A water inlet 22 and a water outlet 23 connected to the water pipe 1 are opened at both ends of the joint pipe 20, and the water inlet 2
A slip nut 24 for connecting to the water pipe 1 is fixed to each end of the water discharge port 2 and the water outlet 23.

Between the water inlet 22 and the water outlet 23 of the joint pipe 20, one end 40a of the body pipe 40 is integrally connected so as to open to the inner wall of the water passage 21 of the joint pipe 20. The joint pipe 20 and the body pipe 40 are integrally cast.

A check valve 30 inserted into the internal space 41 through the opening of the other end 40b of the body tube 40 is fixed at a connection point between the joint tube 20 and the one end 40a of the body tube 40 via a locking screw 44. Has been done. A hexagonal hole 45 through which water can pass is bored at substantially the center of the locking screw 44. The hexagonal hole 45 is a hole into which a hexagonal wrench is fitted.

A connecting pipe portion 51 of the sprinkler head 50 is attached to the opening of the other end 40b of the body pipe 40. An air supply port 42 and a sensor mounting port 43 are provided near the center of the body tube 40 so as to face each other.

As shown in FIG. 2, the joint pipe 20 and the body pipe 40
The check valve 30 internally provided at the connecting portion of the one end 40 a of the ring member 38 has a substantially cylindrical frame 35 and a ring member 38 fitted to the outer periphery of a valve seat portion 36 provided on one end side of the frame 35. A valve body 31 formed by projecting a valve rod 32 on a disc-shaped lid portion 33, and a coil spring 39 for urging the lid portion 33 of the valve body 31 toward the valve seat portion 36 of the frame 35. ing.

In the valve body 31, the lid 33 of the valve body 31 is a frame 35.
The valve rod 32 is axially passed through the insertion hole 37 on the other end side of the frame 35 so as to be engaged with and disengaged from the valve seat portion 36 on the one end side. The ring member 38 is molded from soft synthetic resin.

Normally, as shown in FIG. 1, the valve body 31 of the check valve 30 is framed by the urging force of the coil spring 39 and the fluid pressure of the nonflammable gas sealed in the inner space 41 of the body tube 40. It engages with the valve seat portion 36 of the pipe 35 to block the entry of water from the water passage 21 of the joint pipe 20 into the internal space 41 of the body pipe 40.

As shown in FIG. 1, the sprinkler head 50 comprises a base 50a having a connecting pipe portion 51 for connecting to the sprinkler connecting joint 10 and a cover member 50b attached to the base member 50a from below. Hole 55,
55 ... has been opened. Inside the cover member 50b, a valve body 53 is arranged so as to close the water passage port 52 of the base 50a, and a retaining plate 54 fixed to the valve body 53 is engaged with a locking lever 56. The support plate 57 and the set screw 58 urge the valve body 53 in the closing direction. The tip of the set screw 58 is engaged with the low melting point alloy 59, and the low melting point alloy 59 is in contact with the heat collecting plate 59a.

A vent pipe 70, to which a sealing valve 80 is attached, is attached to the air supply port 42 of the body pipe 40. Sealing valve 8
1, the exhaust port 81 side of the main pipe 80a is connected to the ventilation pipe 70, and the valve body 84 is the valve seat portion 83 on the air supply port 82 side by the coil spring 86 arranged inside the main pipe 80a. Is configured to engage with. The enclosing valve 80 allows the valve body 84 to be disengaged from the valve seat portion 83 against the biasing force of the coil spring 86, and encloses the noncombustible gas from the air supply port 82 into the internal space 41 of the body tube 40. It is possible.

A holding base 60 having a pair of sensor electrodes 61, 61 is attached to the sensor attachment port 43 of the body tube 40. The holding base 60 is formed of a synthetic resin having insulating properties and heat resistance. The sensor electrodes 61, 61 have a screw thread shape, are screwed into the screw holes formed in the holding base 60, and the inner space 41 side of the body tube 40 is exposed so that water entering the inner space 41 of the body tube 40 is splashed. Overhangs.
As shown in FIG. 3, the sensor electrodes 61, 61 are connected to an electric wire C extending from an alarm unit B having a buzzer B1.

Next, the operation will be described. As shown in FIG.
The sprinkler head 50 can be directly attached to the water pipe 1 of a general household by the sprinkler connection joint 10. That is, in the water pipe 1 arranged along the ceiling A1 of the room A, the water inlet 22 and the water outlet 23 at both ends of the joint pipe 20 are provided.
Are connected by a slip nut 24, and the sprinkler head 50 is attached to the opening of the other end 40b of the body tube 40.
Before and after, attaching the ventilation pipe 70 with the sealing valve 80 attached to the air supply port 42 of the body pipe 40, and attaching the holding base 60 having the pair of sensor electrodes 61, 61 to the sensor attachment port 43, Installation of the sprinkler is complete.

A ventilation pipe 7 attached to the air supply port 42 of the body pipe 40
From the sealing valve 80 of 0, the non-combustible gas such as carbon dioxide and nitrogen is sealed in the closed inner space 41 of the body tube 40 at a pressure sufficient to withstand the water pressure flowing through the water passage 21 of the joint tube 20. . When non-combustible gas is injected from the air supply port 82 of the enclosed valve 80 against the biasing force of the coil spring 86 that engages the valve body 84 with the valve seat portion 83, the valve body 84 separates from the valve seat portion 83, The incombustible gas flows from the air supply port 82 to the exhaust port 81, passes through the ventilation pipe 70, and is enclosed in the internal space 41 of the body pipe 40.

Due to the biasing force of the coil spring 86 and the fluid pressure of the non-combustible gas sealed in the inner space 41 of the body tube 40 and the ventilation tube 70, the valve body 84 of the sealing valve 80 is engaged with the valve seat portion 83. The non-combustible gas does not flow out of the sealed valve 80.

As shown in FIG. 1, the inner space 4 of the body tube 40
Due to the fluid pressure of the nonflammable gas sealed in 1, the check valve 30 that prevents the reverse flow of the fluid from the internal space 41 of the body pipe 40 to the water passage 21 of the joint pipe 20 is closed. More specifically,
A valve element provided inside the frame 35 forming the check valve 30 by the biasing force of the coil spring 39 forming the check valve 30 and the fluid pressure of the noncombustible gas sealed in the inner space 41 of the body tube 40. In the reference numeral 31, the valve rod 32 is axially inserted into the insertion hole 37 on the other end side of the frame 35, and the lid portion 33 is connected to the frame 3
5 is engaged with the valve seat portion 36 on one end side.

The check valve 30 allows the joint pipe 20 to be normally operated.
Since the invasion of water from the water passage 21 into the internal space 41 of the body pipe 40 is blocked, water flows from the water inlet 22 of the joint pipe 20 interposed in the middle of the water pipe 1 to the water outlet 23. Even in the state, water does not collect in the internal space 41 of the body tube 40,
No accumulated water (dead water) is generated in the sprinkler connection joint 10.

A portion of one end 40a of the body pipe 40 at the connecting portion of the joint pipe 20 and the body pipe 40 opening to the inner wall of the water passage 21 of the joint pipe 20 is closed by a lid 33 of the check valve 30. In the state, since the upper surface of the lid 33 smoothly continues to the inner wall of the water passage 21, a downward dent does not occur. In this way, since no dents are likely to accumulate in the joint between the joint pipe 20 and the body pipe 40, no water remains near the joint even when draining water from the water pipe 1.

In cold regions and the like, the water in the water pipe 1 freezes at night, the water pipe 1 may burst due to the expansion of the volume, and the faucet 2 may become unusable due to freezing of the water. Water pipe 1 with sprinkler
It is necessary to temporarily drain water from.

In this case, if water remains inside the sprinkler connection joint 10, expansion of the residual water due to freezing may damage the sprinkler connection joint 10. Therefore, in the conventional technique, the vicinity of the sprinkler connection joint is affected. It was necessary to dispose a heating wire for keeping heat, but since water does not remain inside the sprinkler connection joint 10, it is unnecessary to dispose the heating wire.

When a fire occurs while the water supply pipe 1 is filled with water, the heat collecting plate 59a becomes hot,
The low-melting-point alloy 59 that abuts the heat collecting plate 59a is melted, and the support plate 57 and the set screw 58 are attached to the cover member 50.
leave b. Thereby, the water passage 5 of the base 50a
The locking lever 56 that urges the valve body 35 so as to close 2
Is also released from the cover member 50b, and the valve body 53 is moved by the fluid pressure of the nonflammable gas in the body tube 40 to the water inlet 52 of the base 50a.
The water spray holes 55, 55 ... Open.

When the incombustible gas sealed in the body pipe 40 escapes from the open water spray holes 55, 55, the water pressure in the water passage 21 of the joint pipe 20 causes the coil spring 39 of the check valve 30.
Against this, the valve body 31 is disengaged from the valve seat portion 36 of the frame 35, and water in the water passage 21 of the joint pipe 20 passes through the inside of the check valve 30 and the hexagonal hole 45 of the locking screw 44, The water penetrates into the internal space 41 of the pipe 40, and water sprinkling from the water sprinkling holes 55 of the sprinkler head 50 starts.

When water that has entered the inner space 41 of the body tube 40 is splashed on the pair of sensor electrodes 61, 61 projecting into the inner space 41 of the body tube 40, the pair of sensor electrodes 6 is inserted through the water.
1, 61 become conductive. By this conduction, water sprinkling from the sprinkler head 50 due to the fire occurrence is transmitted to the alarm unit B at a place separated from the sprinkler connection joint 10, and the buzzer B1 as an alarm of the alarm unit B sounds to notify the occurrence of the fire. It is possible to quickly respond to evacuation and fire extinguishing.

FIG. 4 shows a second embodiment of the present invention.
In the present embodiment, one end 90a of the body pipe 90 is integrally connected so as to open to the side of the inner wall of the water passage 81 of the joint pipe 80, and the check valve 30 includes the valve rod 32 of the valve rod 31 thereof. Is internally provided at a connecting portion between the joint pipe 80 and the body pipe 90 so that the pipe is substantially perpendicular to the joint pipe 80 and the body pipe 90. A working port 63 for inserting the check valve 30 into the connection part is provided at a position of the one end 90a of the body pipe 90 facing the connection part between the joint pipe 80 and the body pipe 90.
A cap 64 is fitted to the unit 3.

As a result, the joint pipe 8 through which water flows to the end
The lid body 3 of the valve body 31 constituting the check valve 30 is provided on the side of the inner wall of the water passage 81 located above the lower side of the water passage 81 of 0.
3 appears. Therefore, even when water is temporarily drained from the water pipe 1 provided with the sprinkler connection joint 70 in a cold region, water is unlikely to remain in the slight gap between the inner wall of the water passage 81 and the lid 33.

The sprinkler connection joint 10 according to the above-described embodiment is used for general household water supply regardless of whether it is a cold region where water needs to be temporarily drained from the water pipe 1 or other regions. The sprinkler can be easily installed in the pipe 1.

[0043]

According to the sprinkler connection joint of the present invention, a check valve having a valve body for preventing the reverse flow of fluid from the inside of the body pipe to the inside of the joint pipe is provided at the connecting portion of the joint pipe and the body pipe, and the check valve is provided. Due to the fluid pressure of the non-combustible gas that seals the valve body of the valve in the body pipe between the valve body and the sprinkler head attached to the end of the body pipe, the water pressure in the body pipe is increased against the water pressure in the joint pipe. Since it is designed to block the intrusion, accumulated water does not occur near the sprinkler head when water is flowing in the water pipe, and no water remains near the sprinkler head when draining water from the water pipe. The sprinkler can be easily installed in the water pipes of ordinary households in cold regions.

[Brief description of drawings]

FIG. 1 is a sectional view of a sprinkler connection joint showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the check valve of the present invention.

FIG. 3 is an operation explanatory view showing a state in which the sprinkler connection joint showing the first embodiment of the present invention is connected to a water pipe arranged along a ceiling of a room of a general household.

FIG. 4 is a cross-sectional view of essential parts of a sprinkler connection joint showing a second embodiment of the present invention.

[Explanation of symbols]

 10, 70 ... Sprinkler connection joint 20, 80 ... Joint pipe 30 ... Check valve 31 ... Valve body 40, 90 ... Body pipe 50 ... Sprinkler head 61 ... Sensor electrode

Claims (2)

[Claims] 1. A sprinkler connection joint comprising a joint pipe inserted in the middle of a water pipe and a body pipe equipped with a sprinkler head that normally sprinkles water when a water hole is closed and opens in the event of a fire. Between the water inlet and the water outlet of the joint pipe, one end of the body pipe is connected, and a check valve having a valve body for preventing the reverse flow of the fluid from the inside of the body pipe into the joint pipe is provided at the connection point. Provided, the valve body of the check valve, against the water pressure in the joint pipe by the fluid pressure of the non-combustible gas sealed in the body pipe between the valve body and the sprinkler head mounted on the other end of the body pipe. A sprinkler connection joint, which is provided so as to block the entry of water into the body tube. 2. In order to prevent water from entering the body tube,
The sprinkler connection joint according to claim 1, further comprising at least a pair of sensor electrodes which are arranged in proximity to each other so as to connect the invading water so as to be continuous with each other.