JP2014213052A - Fire-extinguishing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately and economically perform water freezing prevention control.SOLUTION: Water feed fire-extinguishing equipment includes a secondary-side pipe 3 with a fire-extinguishing head S communicatively connected to the downstream side of a primary-side pipe 1. The secondary-side pipe 3 is configured as a loop pipe R including a main pipe R1 and a communication pipe R2 communicatively connected from the tip end side to the base end side of the main pipe R1, and includes a water temperature sensor 7 that freely detects a temperature of fire-extinguishing water w in the loop pipe R, and water circulation means 8 that circulates the fire-extinguishing water w in the loop pie R when a detection temperature of the fire-extinguishing water w by a water temperature sensor 7 becomes a set freezing caution temperature or less.

Description

  The present invention relates to a fire extinguishing facility in which a secondary side pipe provided with a fire extinguishing head is connected to a downstream side of a primary side pipe.

  Conventionally, as this type of fire extinguishing equipment, the secondary side pipe is configured with a circulation path, provided with a temperature sensor that detects the temperature of the area where the fire extinguishing head is installed, and when the detected value of the temperature sensor falls below a predetermined temperature There is a water circulation means that circulates water in the circulation path, and water can be circulated by the water circulation means before the water in the secondary side pipe freezes to prevent freezing (for example, see Patent Document 1). .

JP 2010-158286 A (FIG. 1)

According to the above-described conventional fire extinguishing equipment, the temperature of the installation area of the fire extinguishing head (detected value of the temperature sensor) is configured to control the operation of the water circulation means when the temperature falls to, for example, −5 ° C. That is, the operation control of the water circulation means is performed based on, for example, the temperature in the installation area of the fire extinguishing head.
However, even if the detected temperature is −5 ° C., considering that the specific heat of air and water is different and that it takes time until the temperature and water temperature are in equilibrium, It is not always the case when the temperature and water temperature show similar changes.
That is, as an example, when the temperature suddenly drops and the temperature becomes a value lower than −5 ° C. (for example, −10 ° C.), the water in the secondary side pipe is not necessarily 0 ° C. or lower. It may not freeze, and it may not freeze if it does not reach equilibrium with temperature.
As described above, according to the conventional fire extinguishing equipment, there is a possibility that the control accuracy of the water circulation means for preventing the water from freezing is lowered.
In order to solve this problem and control the water circulation means to ensure prevention of freezing, the safety factor in the temperature control is considered high, and as a result, the water in the circulation path is considerably before freezing. It is necessary to operate the water circulation means from the point of time.
As a result, the operation time of the water circulation means becomes longer, the wear of the equipment becomes severe, and in addition, a wasteful power cost is required, resulting in a problem of low economic efficiency.

  Accordingly, an object of the present invention is to provide a fire extinguishing facility that can solve the above-mentioned problems and can perform water freeze prevention control with high accuracy and economically.

  A first characteristic configuration of the present invention is a fire extinguishing facility in which a secondary side pipe provided with a fire extinguishing head is connected to the downstream side of the primary side pipe, and the secondary side pipe includes a main pipe portion, It is configured as a loop pipe provided with a communication pipe part that communicates and communicates from the distal end side to the base end side of the main pipe part, a water temperature sensor that can detect the temperature of fire-extinguishing water in the loop pipe, and the water temperature sensor A water circulation means for circulating the fire-extinguishing water in the loop pipe when the detected temperature of the fire-extinguishing water is equal to or lower than a set freezing warning temperature is provided.

According to the first characteristic configuration of the present invention, the anti-freezing operation for operating the water circulation means can be performed based on the detected temperature of the fire-extinguishing water in the loop pipe detected by the water temperature sensor. This can be reflected in the freeze prevention control, and the fire-extinguishing water can be circulated at a more preferable timing.
Therefore, the control accuracy of the water circulation means is improved, and the freezing prevention operation with less waste can surely and economically prevent the water in the secondary side pipe from freezing.

  According to a second characteristic configuration of the present invention, the water circulation means is provided across a check valve provided in the loop pipe, and an upstream part and a downstream part across the installation part of the check valve in the loop pipe. A bypass pipe and a circulation pump provided in the bypass pipe are provided.

According to the second characteristic configuration of the present invention, in the anti-freezing operation, the fire-extinguishing water is circulated along the predetermined flow direction in the loop pipe only by driving the circulation pump of the bypass pipe. However, in the fire fighting operation in which fire water is sent from the primary side piping to the fire extinguishing head in the event of a fire, the flow is not hindered by the bypass piping and circulation pump, and the fire extinguishing operation can be carried out smoothly. .
Further, the bypass pipe, the circulation pump, and the check valve can be unitized, and in that case, it can be easily incorporated into the fire extinguishing equipment, and good workability can be obtained.

  According to a third characteristic configuration of the present invention, a water pressure limiting means for limiting a working water pressure to the circulation pump is provided in the bypass pipe as the fire water is supplied to the fire head. .

According to the 3rd characteristic structure of this invention, even if the water pressure of secondary side piping rises with the said fire extinguishing operation, it can prevent that a high pressure acts on the circulation pump by a water pressure limiting means.
Accordingly, it is possible to prevent malfunction of the circulation pump due to high pressure, water leakage of the circulation pump, and the like.

  According to a fourth characteristic configuration of the present invention, a running water detection device is interposed between the primary side piping and the secondary side piping, and the water circulation means is disposed in the vicinity of the downstream side of the running water detection device. There is where it is.

Because of the necessity of maintenance, the flowing water detector is often installed at a place where maintenance work is easily performed, such as a shaft portion of a building.
Therefore, according to the fourth characteristic configuration of the present invention, since the water circulation means is arranged in the vicinity of the downstream side of the water flow detection device, the maintenance work for the water circulation means is also performed in the same manner as the water flow detection device. It becomes easy.
As a result, it is possible to improve the maintainability of the water circulation means.

Schematic diagram showing the installation status of fire extinguishing equipment Schematic showing fire extinguishing equipment of another embodiment Schematic showing fire extinguishing equipment of another embodiment

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an embodiment of a fire extinguishing equipment according to the present invention. In this embodiment, the fire extinguishing equipment F is described by taking a “closed wet sprinkler equipment” as an example, and is installed in a building. A plurality of sprinkler heads (an example of a fire extinguishing head) S is provided in each of a plurality of set fire extinguishing regions K, and water (an example of fire extinguishing water) w is sprinkled from the sprinkler head S corresponding to a fire. ing.
In addition, the fire extinguishing area | region K is each provided for every hierarchy in the said embodiment. In addition, a plurality of fire extinguishing areas K may be provided on the same level.

  The fire extinguishing equipment F is configured by connecting a flowing water detection device 2 and a secondary side pipe 3 including the plurality of sprinkler heads S in series in a downstream state of the primary side pipe 1.

  The primary side pipe 1 is installed from the water storage tank 4 to each secondary side pipe 3, and the water w of the water storage tank 4 can be supplied to each secondary side pipe 3 by the water supply pump P <b> 1 provided in the pipe path. It is configured as follows.

The flowing water detection device 2 can detect the flow of water in the pipe accompanying the operation of the sprinkler head S due to a fire or the like, and transmits the detection result as an electric signal to a water pump control device (not shown). It is configured.
The water pump control device is configured to drive the water pump P <b> 1 and continue watering from the sprinkler head S when receiving an electrical signal from the flowing water detection device 2. In addition, an alarm signal may be issued.

The secondary side pipe 3 is configured as a loop pipe R including a main pipe portion R1 and a communication pipe portion R2 that is connected in communication from the distal end side to the proximal end side of the main pipe portion R1, and a plurality of the secondary pipes 3 are provided in the main pipe portion R1. Sprinkler heads S are respectively attached to the tips of the branch pipes 6.
In addition, the branch pipe 6 is coat | covered in the state which wraps the outer peripheral part with the heat insulating material h, and it is comprised so that the water w can be prevented from freezing in the branch pipe 6. FIG.

  On the other hand, the loop pipe R is configured to prevent freezing by circulating the water w in the loop pipe R, and a water temperature sensor 7 capable of detecting the temperature of the water w in the loop pipe R and the water temperature A water circulation means 8 for circulating the water w in the loop pipe R when the temperature detected by the sensor 7 is equal to or lower than the set freezing warning temperature is provided.

Although the water temperature sensor 7 may be provided at any position in the loop pipe R, in the present embodiment, the water temperature sensor 7 is provided at the main pipe portion R1.
The detection result of the water temperature sensor 7 is transmitted to the circulation pump control device 5 as an electric signal.

The unit Y of the water circulation means 8 is attached to a part of the base end side portion of the main pipe portion R1.
The unit Y is configured by an annular piping member that includes a main body portion 8A that is a part of the main pipe portion R1 and a bypass piping 8B that is connected in parallel to the main body portion 8A. Further, the unit Y is arranged in the vicinity of the downstream side of the flowing water detection device 2. For example, the unit Y can be provided together with the flowing water detection device 2 in a shaft portion or a pipe space of a building, and work such as maintenance is performed. Can be implemented efficiently.

A check valve 9 that allows a flow from the proximal end side to the distal end side of the main pipe portion R1 and prevents a flow on the opposite side is attached to the main body portion 8A. A similar check valve 11 is also installed in the communication pipe portion R2.
The bypass pipe 8B is provided with a circulation pump P2 in the middle of the path. Further, a constant flow valve (an example of a water pressure limiting means) 10 is provided on the bypass pipe 8B on the upstream side of the circulation pump P2.

The circulation pump P2 is controlled by the circulation pump control device 5 so as to start driving when the temperature detected by the water temperature sensor 7 is equal to or lower than a set freezing warning temperature (for example, 1 ° C.). Accordingly, the bypass pipe 8B provided with the circulation pump P2 passes through the main pipe portion R1 and passes through the communication pipe portion R2 from the distal end portion of the main pipe portion R1 to the base end portion of the main pipe portion R1 and the bypass pipe 8B. Water can be circulated in the return circulation path to prevent freezing (see arrows in FIG. 1).
During the circulation operation, the flow of water is restricted in one direction by the check valve 9 of the main body 8A and the check valve 11 of the communication pipe portion R2. In other words, the check valve 9 prevents the water w sent by the circulation pump P2 from short-circuiting between the bypass pipe 8B and the main body 8A, thereby circulating through the main pipe R1 and the communication pipe R2. Can be made.

  Further, since the flow rate during the circulation operation by the circulation pump P2 is merely moved to prevent freezing of the water, a small amount is sufficient, and the flow rate during the circulation operation is obtained by the action of the constant flow valve 10. Can be set to a low flow rate.

According to the fire extinguishing equipment F, the anti-freezing operation in which the water circulation means 8 is operated based on the detected temperature of the water in the loop pipe R can be performed, so that the control accuracy of the water circulation means 8 is improved and the anti-freezing prevention with less waste. By the operation, it is possible to reliably and economically prevent the water in the secondary side pipe 3 from freezing.
Moreover, at the time of fire extinguishing operation by water supply from the water pump P, the bypass pipe 8B and the circulation pump P2 do not impede the flow, and the fire extinguishing operation can be smoothly performed.
Moreover, since the water circulation means 8 is unitized and is provided in the vicinity of the downstream side of the flowing water detection device 2, the maintenance work can be performed efficiently, and the maintenance management performance of the fire extinguishing equipment F can be improved. it can.

[Another embodiment]
Other embodiments will be described below.

<1> The installation target of the fire extinguishing equipment F is not limited to a building having a plurality of layers described in the previous embodiment, and may be, for example, a single-layer building or a single layer in a single layer. In addition to those provided with the fire extinguishing area K, a plurality of fire extinguishing areas K may be provided.

<2> The water circulation means 8 is not limited to the one configured as the unit Y described in the previous embodiment, and each component may be formed by being incorporated in the loop pipe R.
Further, the configuration of the water circulation means 8 is not limited to being provided in the main pipe portion R1, but may be provided in the communication pipe portion R2 (see FIG. 2).
Further, the circulation pump P2 is directly provided in the communication pipe portion R2 of the loop pipe R as shown in FIG. 2 instead of the configuration provided in the bypass pipe 8B parallel to the loop pipe R. May be.
In addition, the check valves 9 and 11 may employ either or neither of them.

<3> The water pressure limiting means 10 is not limited to being provided only on the upstream side of the circulation pump P2 described in the previous embodiment, but may be provided on the downstream side as shown in FIG. Even when a large amount of water is sent to the sprinkler head S by the pump P1, it is possible to prevent a high pressure from acting on the circulation pump P2, and a malfunction of the circulation pump due to the high pressure can be prevented. It is possible to prevent water leakage of the pump.

<4> The water temperature sensor 7 is not limited to the one provided in the main pipe portion R1 described in the previous embodiment. For example, the water temperature sensor 7 may be provided at a position different from the main pipe portion R1 in the loop pipe R. In short, any position where the temperature of the water in the loop pipe R can be detected may be used.
In the loop pipe R, when a location where the water temperature is likely to decrease can be specified in advance, it is preferable to install the water temperature sensor 7 at that location.

<5> The fire extinguishing head S is not limited to the sprinkler head described in the previous embodiment, and may be a foam head, for example.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Primary side piping 2 Flowing water detection apparatus 3 Secondary side piping 7 Water temperature sensor 8 Water circulation means 8B Bypass piping 9 Check valve 10 Constant flow valve (an example of water pressure limiting means)
P2 Circulation pump R Loop piping R1 Main pipe section R2 Communication pipe section S Sprinkler head (an example of a fire extinguishing head)
w Water (an example of fire-fighting water)

Claims (4)

A fire extinguishing facility in which a secondary side pipe having a fire extinguishing head is connected to the downstream side of the primary side pipe,
The secondary side pipe is configured as a loop pipe having a main pipe portion and a communication pipe portion that is connected in communication from the distal end side to the proximal end side of the main pipe portion,
A water temperature sensor that can detect the temperature of the fire-extinguishing water in the loop piping,
A fire extinguishing facility provided with water circulation means for circulating the fire-extinguishing water in the loop pipe when the temperature detected by the water temperature sensor is equal to or lower than a preset freezing warning temperature.   The water circulation means is provided in a check valve provided in the loop pipe, a bypass pipe provided between an upstream part and a downstream part across the installation part of the check valve in the loop pipe, and the bypass pipe. The fire extinguishing equipment according to claim 1, further comprising a circulation pump.   The fire extinguishing equipment according to claim 2, wherein a water pressure limiting means for limiting a working water pressure to the circulation pump is provided in the bypass pipe as the fire water is supplied to the fire extinguishing head.   The flowing water detection device is interposed between the primary side piping and the secondary side piping, and the water circulation means is disposed in the vicinity of the downstream side of the flowing water detection device. Fire extinguishing equipment according to item 1.

Images