JP3292424B2 - Fire extinguisher with automatic alarm valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with an automatic alarm valve which is fixedly installed in a building or a parking lot, etc., which automatically sprays a fire extinguishing solution from a fire extinguishing head and issues a fire alarm issuing signal when a fire occurs. Fire extinguishing equipment.

[0002]

2. Description of the Related Art Generally, a fire extinguishing system of this type is provided with a structure shown in FIGS.
An automatic alarm valve A as shown in FIG. 8 is incorporated. In this automatic alarm valve A, a short cylindrical valve seat sleeve 12 having an annular upper end surface as a valve seat 20 of the check valve 2 is fitted in a casing main body 1 provided with pipe connection portions 11a and 11b at upper and lower ends. At the same time, the disc-shaped valve body 21 is fitted to the valve seat 20 from above by the swing lever 22 pivotally connected to the inner surface of the casing body 1 via the pin 22a via the pin 22a so that the valve can be closed. The casing main body 1 is held so as to be able to move up and down and is divided into a lower primary side chamber 1a and an upper secondary side chamber 1b with the check valve 2 as a boundary. Further, a drain valve case 11c is integrally formed on one side of the casing body 1, and a drain valve 3 including a valve seat 30 formed on an inner periphery thereof and a valve body 31 that is opened and closed by a handle 32 is provided. The secondary chamber 1b communicates with a drain pipe 13 connected to a lower part of the drain valve case 11c. Reference numeral 14 denotes a cover that closes the front opening of the casing body 11.

On the other hand, an annular flow path 15 is formed between the outer peripheral portion of the valve seat sleeve 12 and the casing body 1 and communicates with the annular flow path 15 on the annular surface of the valve seat 20 of the check valve 2. A number of small holes 16 are opened, and these small holes 16 are set so as to be closed by the valve element 21 when the valve is closed.
The annular flow path 15 is connected to a lower end of the retarding chamber 4a of the alarm pressure switch 4 by a liquid passage 17 inserted through a signal stop valve 17a.
A more branched drain pipe 18 communicates with the outlet side space of the drain valve case 11c, and a liquid leak device 19 made of an auto drip or an orifice is inserted into the drain pipe 18.

[0004] Further, as shown in FIG.
On the side opposite to the side having the drain valve case 11c, the pressure gauges 5a, 5b are respectively connected to the primary chamber 1a and the secondary chamber 1b via pipes 7a, 7b interposed with the on-off valves 6a, 6b, respectively.
Are connected to each other.

[0005] As shown in Fig. 9, a conventional general sprinkler type fire extinguishing system has a secondary pipe L2 provided for each spraying section at a primary pipe L1 extending from a pressurized liquid feed pump P. ... (only one is shown and the others are omitted) are connected in a branched manner through the automatic alarm valve A having the above configuration, and each of the secondary pipes L2 is sealed with a thermal fuse that is melted by heat. Required number of sprinkler heads H
Are connected in a branched manner, and the branched secondary pipes L2 are joined at the terminal side, and the discharge pipe L3 inserted through the terminal test valve Vt.
It is connected to the. Further, a detection pipe line L4 communicating from the primary side pipe L1 to the pressure air tank T is branched, and the pressure air tank T has a pump start pressure switch S and a pressure gauge G0.
Is attached. V is an on-off valve that is inserted in a piping location and is always kept open, and Vd is a discharge valve of the pressurized air tank T.

In such a fire-extinguishing facility, when filling the facility piping, the drain valve 3 of the automatic alarm valve A is closed, and the pressurized liquid sending pump P is started up with the terminal test valve Vt opened. Fire extinguishing water is supplied from the primary pipe L1 to the secondary pipe L2 ...
When the fire extinguishing water flows out of the discharge pipe L3, the terminal test valve Vt is closed. At the same time, the valve body 21 of the automatic alarm valve A closes due to the water hammer associated with the closing, and the pressure on the secondary side also increases. Is enclosed. Accordingly, the pressure in the equipment pipe is higher on the secondary side than on the primary side, and the pressure difference causes the valve body 21 to press tightly against the valve seat 20, thereby causing the valve seat 2.
The small holes 16 opened on the 0 plane are also closed, and the inside of the annular flow path 15 and the liquid passage 17 is kept empty by the drainage from the drain pipe 18.

When a fire occurs in any of the spraying sections, the sprinkler heads H in the section are opened by heat, and the pressure on the secondary side is increased due to the spraying of fire-extinguishing water sealed in a pressurized state. , The valve body 21 of the automatic alarm valve A is opened, and the pressure in the pressure air tank T decreases due to the water flowing from the primary pipe L1 to the secondary pipe L2. Is activated to start water supply from the pressurized water supply pump P, and at the automatic alarm valve A, water flows into the retarding chamber 4a from the small holes 16 through the annular flow path 15 and the liquid passage pipe 17. Charge,
The alarm pressure switch 4 is actuated by the internal pressure rise accompanying this, and the fire alarm is automatically issued based on the signal.

However, in such a fire extinguishing system, when the temperature of the surrounding atmosphere increases, the pressures on the primary side and the secondary side also increase. However, since the automatic alarm valve A is a check valve mechanism, Even if the pressure rise on the primary side is absorbed by the pressurized air tank T, the pressure rise on the secondary side is not absorbed, so that the abnormal pressure rise on the secondary side causes the sprinkler heads H ... and the secondary pipes L2 ... Leakage from seams, etc.
In some cases, the secondary side pipe L2... Or each component may be damaged.

In the fire extinguishing system of the foam fire extinguishing system, a foam head is branched and connected to the secondary pipe L2 in FIG. 9 instead of the sprinkler heads H, and the upstream side of the secondary pipe L2 for each spraying area. And a mixer for mixing water sent from the pressurized liquid feed pump P and the fire extinguishing solution is interposed in the middle of the primary pipe L1, and a fire extinguishing solution obtained by mixing the water and the fire extinguishing solution is interposed. Are filled in the secondary pipes L2 ... from the automatic alarm valve A to the simultaneous release valves, there is a problem of liquid leakage or breakage due to pressure increase on the secondary side due to temperature rise similar to the sprinkler method.

Therefore, as shown in FIG. 10, means for providing a bypass passage Lb with an orifice O interposed between the primary pipe L1 and the secondary pipe L2.
717 has been proposed. According to this means,
If the secondary side pressure is higher than the primary side, the secondary side liquid corresponding to the differential pressure is returned to the primary side through the orifice O, so that the secondary side excessive pressure rise is avoided, and the pressure rise The water leakage and breakage caused by the above can be prevented.

[0011]

However, according to the proposed means, when the bypass flow path Lb is provided for an existing fire extinguishing system with an automatic alarm valve, the primary side pipe L1
After the fire extinguishing liquid filled in the secondary side pipes L2 is extracted, the piping at the connection part is cut or the fittings are attached to connect the bypass flow path Lb. Since the primary pipe L1 and the secondary pipe L2 are filled and adjustment of each mechanism is performed, there is a problem that the installation work is extremely troublesome and takes a long time.
The fire extinguishing solution is water in the sprinkler system, whereas the foam fire extinguishing system uses an expensive fire extinguishing solution together with water. There was also a drawback that the fire extinguishing stock solution that was not available and was disposed of was replenished in proportion to the disposal, and the cost burden for this was large.

In view of the above situation, the present invention provides a fire extinguishing system equipped with an automatic alarm valve that sprays water or fire extinguishing liquid from a fire extinguishing head such as a sprinkler head or a foam head when a fire occurs and issues a fire alarm issuing signal. Excessive rise in the secondary pressure due to the rise can be avoided, and it can be applied to existing fire extinguishing equipment by adding a simple pipe. In this application, the fire extinguishing liquid in the piping is not wasted, and It is an object of the present invention to provide a road mounting work that can be performed extremely easily in a short time.

[0013]

In order to achieve the above object, the invention of claim 1 is directed to a secondary method in which a flow of a fire extinguishing liquid is connected to a fire extinguishing head from a primary side connected to a pressurized liquid sending pump and a pressure air tank. A check valve that regulates in one direction to the side and closes at normal times, and provided on the valve seat surface when the check valve opens due to a pressure drop on the secondary side due to the opening of the fire extinguishing head in the event of a fire. An automatic alarm valve having a pressure switch that detects a pressure rise due to liquid flow from the small hole and issues a fire alarm command signal is provided, and the respective pressures are displayed on the respective primary and secondary flow paths. In a fire extinguishing system with an automatic alarm valve, a pressure gauge to be connected is connected by a pipe inserted through an on-off valve,
Has a bypass passage that connects between the flow path of the primary side and the secondary side without passing through the check valve, in the bypass flow path, the secondary-side pressure
Opens when the pressure becomes higher than the primary pressure by more than a predetermined value.
A differential pressure valve is interposed, and both ends of the bypass flow passage are connected to the pipelines of the two pressure gauges via a T-shaped joint.

[0014]

According to the first aspect of the present invention, when the secondary pressure becomes higher than the primary pressure, the secondary liquid is returned to the primary through the bypass flow path. Pressure build-up is avoided. Also, when the pressure on the secondary side drops due to the opening of the fire extinguishing head when a fire occurs, the liquid does not suddenly flow from the primary side to the secondary side through the bypass channel, so the check valve of the automatic alarm valve is opened. There is no problem in operation. Since this bypass passage has a structure in which it is connected to the passage on both sides by using a pipe line with an on-off valve that connects the primary side and the secondary side pressure gauges, the bypass passage is connected to the existing fire extinguishing equipment. When a new flow path is installed, the on-off valves of the two pipes are closed, the pressure gauge is removed, and the pressure gauge and the end of the pipe of the bypass flow path are connected to the position via a T-shaped joint. It is not necessary to extract the fire extinguishing liquid filled in the primary and secondary pipes.

Further, the differential pressure regulating valve of the bypass passage, since the secondary pressure is maintained at all times higher than the primary pressure, the check valve of the automatic alarm valve valve element of the secondary side and the primary side Due to the pressure difference, the valve is tightly pressed against the valve seat to maintain a reliable closed state, and the small hole on the valve seat surface that leads to the alarm pressure switch is completely closed, so that the entire equipment piping due to liquid leakage into the small hole The pressure drop over time is prevented.

[0016]

FIG. 1 is an explanatory view of a sprinkler type fire extinguishing system according to a first embodiment of the present invention. In the fire extinguishing equipment of FIG. 1, compared with the general fire extinguishing equipment of FIG. 9 described above,
The bypass passage Lb inserted through the differential pressure valve 8 is connected to the automatic alarm valve A.
Are connected between the mounting pipes 7a, 7b of the primary and secondary pressure gauges 5a, 5b, but all other components are common. The same reference numerals are given and the detailed description is omitted. The automatic alarm valve A also has the same configuration as that described above with reference to FIGS. 6 to 8 except that the bypass flow path Lb is connected.

That is, the conventional automatic alarm valve A shown in FIG.
Then, the pressure gauges 5a and 5b on the primary side and the secondary side are directly connected to the pipelines 7a and 7b with the on-off valves 6a and 6b which are connected to the primary side chamber 1a and the secondary side chamber 1b (see FIG. 7), respectively. Have been. On the other hand, in the first embodiment of the present invention, as shown in FIG.
The T-shaped joint 9a is connected to a primary-side pressure gauge 5a and a primary passage Lb of a bypass flow path Lb.
1, and a secondary pressure gauge 5b and a secondary pipe line Lb2 of the bypass flow path Lb are connected to the T-shaped pipe joint 9b.

Differential pressure valve 8 inserted in bypass flow path Lb
As shown in FIG. 5, female threads 81a, 8
A valve box 80 is composed of a cylindrical shaft-shaped case main body 81 on which 1b is engraved, and a cover body 82 which is externally screwed to one end of the case main body 81.
A short-axis valve element 83 is axially movably mounted in the valve chamber 8a, and is pressed against an O-ring valve seat 85 by the urging of a coil spring 84. There is a gap t between the surface and the outer peripheral surface of the valve element 83. The other end of the case body 81 is provided with an inlet hole 8b communicating with the valve chamber 8a, and is screwed to the secondary pipe Lb2 of the bypass passage Lb via the female screw 81b. Further, the cover body 82 has an outlet hole 8c communicating with the valve chamber 8a, and a female screw 82a is engraved on an outer peripheral surface of an end portion opposite to a connection side with the case main body 81,
The female screw 82a is threadedly connected to the primary pipe Lb1 of the bypass flow path Lb.

In the fire extinguishing equipment of the first embodiment, when water is supplied into the equipment piping, the drain valve 3 of the automatic alarm valve A is closed and the pressurized liquid is sent under the open state of the terminal test valve Vt, as in the prior art. By starting the pump P, the fire extinguishing water is supplied to the primary side pipe L1.
When the fire extinguishing water flows out of the discharge pipe L3, the terminal test valve Vt is closed. The water hammer accompanying this closing causes the valve 21 of the automatic alarm valve A (FIG. 6). , 7) is closed and at the same time the pressure on the secondary side is sealed. Therefore, the pressure in the equipment pipe is higher on the secondary side than on the primary side, and as shown in FIGS. 6 and 7, this pressure difference causes the valve body 21 to be pressed tightly against the valve seat 20, and the valve seat The small holes 16 opened on the surface 20 are also closed, and the inside of the annular flow path 15 and the liquid passage 17 is kept empty by the drainage from the drain pipe 18. At this time, the valve element 83 of the differential pressure valve 8 causes the valve seat 85
, And the pressure difference between the secondary side and the primary side is maintained because the bypass flow path Lb is closed.

FIG. 2 is an explanatory view of a fire extinguishing system of a foam extinguishing system according to a second embodiment of the present invention. In the fire extinguishing equipment of FIG. 2, mixers 10a, 10a are interposed in the middle of the primary side pipe L1, and the water sent from the pressurized liquid sending pump P by the mixers 10a, 10a and the inside of the fire extinguishing solution tank 10b. The fire extinguishing solution is automatically mixed and distributed and supplied to the secondary pipes L2 through the automatic alarm valve A as a foaming fire extinguishing solution. Although not shown in the drawing, a foam head is branched and connected to the end of each of the secondary pipes L2 instead of the sprinkler heads H in FIG. A simultaneous release valve is interposed on the upstream side, and the fire extinguishing liquid fills the pipes from the automatic alarm valve A to the respective simultaneous release valves in the secondary pipes L2.
The other components are the same as those in the first embodiment, and are provided between the mounting pipes 7a and 7b of the primary and secondary pressure gauges 5a and 5b attached to the automatic alarm valve A. , Differential pressure valve 8
Is connected to the bypass passage Lb.

In the constructions of the first and second embodiments described above, when the temperature of the surrounding atmosphere increases, the pressures on the primary side and the secondary side also increase. When the pressure is absorbed by T and the pressure difference between the secondary side and the primary side becomes larger than the urging force of the coil spring 84 pressing the valve body 83 of the differential pressure valve 8, the valve body 83 is moved to the valve seat 8.
4, the fire extinguishing liquid (water in the first embodiment) in the secondary pipes L2... Is returned to the primary pipe L1 through the bypass flow path Lb. It is absorbed by the air tank T. Then, when the pressure difference between the secondary side and the primary side becomes smaller than the urging force of the coil spring 84 due to the return of the liquid to some extent, the differential pressure valve 8 is closed by the valve body 83 being pressed against the valve seat 84. Therefore, in normal times,
Excessive pressure increase on the secondary side may cause leakage (water leakage) from the sprinkler head H or the seam of the foam head or the secondary side pipe L2, or damage to the secondary side pipe L2 and components. There is no fear of inviting.

When the existing general fire extinguishing equipment is used, a new bypass flow path Lb is installed. In this installation, the pressure gauges 5a and 5b of the automatic alarm valve A shown in FIG. Pipes 7a, 7 with
b, closing the open valves 6a and 6b, removing the pressure gauges 5a and 5b, and connecting the T-shaped fittings 9a and 9b instead.
The pressure gauges 5a and 5b and the primary and secondary pipelines Lb1 and Lb2 may be connected to the U-shaped joints 9a and 9b. Therefore, the primary and secondary pipes L1,
The fire extinguishing liquid filled in L2 does not need to be extracted and can be used as it is without waste. Especially in the case of the foam fire extinguishing method, it is not necessary to replenish expensive fire extinguishing liquid, so that the cost burden is small, and the primary and There is no need to cut the pipe as in the case where the bypass flow path Lb is directly connected to the pipes L1 and L2 on the secondary side, and it is not necessary to perform the liquid filling operation after the bypass flow path Lb is installed and to adjust each part. The installation work can be completed in a very short time and in a very short time.

[0023] Since the above Symbol first and second embodiment uses the differential pressure valve 8 as the liquid flow control means for interposed in the bypass passage Lb, always maintained at a state higher than the pressure of the secondary side primary Due to this pressure difference, the valve body 21 of the automatic alarm valve A is pressed tightly against the valve seat 20, and the small holes 16 on the surface of the valve seat 20 are securely kept closed, and the small holes 16. Since the liquid does not flow in and is not discharged to the outside through the liquid leaking device 19 of the drain pipe 18, the pressure of the entire equipment pipe does not drop over time, and the pressure drop is determined by the pump start pressure switch S.
Is detected, and the pressurized liquid feed pump P is started, and the alarm pressure switch 4 is activated by the opening of the valve element 21 due to the water hammer at the time of the start, thereby causing a problem that a false alarm of a fire alarm is issued. There is an advantage.

In the above embodiment, the pipe lines 7a and 7b for mounting the primary and secondary pressure gauges 5a and 5b are connected to the primary chamber 1a and the secondary chamber 1 of the automatic alarm valve A, respectively. The pipes 7a and 7b may be connected to the primary and secondary pipes L1 and L2, respectively. Further, the fire extinguishing equipment with an automatic alarm valve of the present invention can be variously modified in design other than the embodiment, such as the shape and structure of each part of the automatic alarm valve A, the flow path configuration, the detailed structure of the differential pressure valve 8, and the like. .

[0025]

According to the fire extinguishing system with an automatic alarm valve according to the first aspect of the present invention, even if the pressure on the secondary side rises due to an increase in the ambient temperature, the liquid on the secondary side flows through the bypass flow path. Since it is returned to the primary side, leakage from the fire extinguishing head and the joint of the secondary side pipe due to excessive rise in the secondary side pressure, and damage to the secondary side pipe and components are reliably avoided. ,
The existing general fire extinguishing equipment can be used simply by adding a bypass flow path, and it is necessary to drain the fire extinguishing liquid filled in the primary and secondary pipes when installing the bypass flow path In particular, the foam fire extinguishing method does not require replenishment of expensive fire extinguishing solution, which reduces the cost burden, does not require cutting of the primary and secondary pipes, performs charging after installation, and No adjustment is required, and the mounting operation can be completed very easily and in a short time.

Further, an automatic alarm valve with fire extinguishing systems described above, since the pressure of the normal time in the secondary side is maintained at all times higher than the primary side, the automatic alarm valve holds a reliable closed state, There is provided an apparatus which does not cause a pressure drop over time of the entire equipment piping and can prevent a malfunction such as a start of a pressurized liquid supply pump due to the pressure drop or a false alarm of a fire alarm caused by the start.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a fire extinguisher with an automatic alarm valve according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a fire extinguisher with an automatic alarm valve according to the second embodiment.

FIG. 3 is an explanatory diagram of a fire extinguisher with an automatic alarm valve according to the third embodiment.

FIG. 4 is a front view of an automatic alarm valve portion in the fire extinguishing equipment of FIGS. 1 and 2.

FIG. 5 is a vertical sectional side view of a differential pressure valve inserted into a bypass passage in the fire extinguishing equipment.

FIG. 6 is a cross-sectional plan view of the automatic alarm valve in the fire extinguishing equipment of FIGS.

FIG. 7 is a vertical side view of the automatic alarm valve.

FIG. 8 is a front view of an automatic alarm valve in a conventional fire extinguishing system.

FIG. 9 is an explanatory diagram showing a configuration example of a conventional fire extinguisher with an automatic alarm valve.

FIG. 10 is an explanatory diagram showing a configuration example of a fire extinguishing system with an automatic alarm valve proposed in the past.

[Explanation of symbols]

 A Automatic alarm valve H Sprinkler head (fire extinguishing head) L1 Primary piping L2 Secondary piping P Pressurized liquid pump T Air pressure tank 2 Check valve 4 Pressure switch 5a Primary pressure gauge 5b Secondary pressure gauge 6a Primary side open / close valve 6b Secondary side open / close valve 7a Primary side pipeline 7b Secondary side pipeline 8 Differential pressure valve (liquid flow control means) 9a Primary side T-shaped pipe joint 9b Secondary side T-shaped pipe Joint 16 Small hole 20 Valve seat 21 Valve

Continuation of the front page (56) References JP-A-7-265456 (JP, A) JP-A-60-129059 (JP, A) JP-A 54-25698 (JP, U) JP-A 64-20870 (JP , U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A62C 27/00-39/00

Claims (1)

(57) [Claims] 1. A check valve for restricting the flow of a fire extinguishing liquid in one direction from a primary side connected to a pressurized liquid sending pump and a pressurized air tank to a secondary side connected to a fire extinguishing head, and closing the check valve at normal times; When the check valve opens due to the pressure drop on the secondary side due to the opening of the fire extinguishing head at the time, the pressure rise due to the flow of liquid from the small hole provided on the valve seat surface is detected and a fire alarm signal is issued. And an automatic alarm valve having a pressure switch for generating a pressure, and a pressure gauge for displaying respective pressures connected to each of the primary and secondary flow paths by a pipe inserted through an on-off valve. in fire fighting equipment attached has a bypass passage that connects between the flow path of the primary side without passing through the check valve and the secondary side, in the bypass flow path, the secondary-side pressure
Opens when the pressure becomes higher than the primary pressure by more than a predetermined value.
A fire extinguishing system with an automatic alarm valve, characterized in that a differential pressure valve is inserted and both ends of the bypass flow path are connected to the pipes of the two pressure gauges via T-shaped joints.