JP2008206620A - Water spray type fire extinguishing facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water spray type fire extinguishing facility, with less friction loss resistance, in which hydraulic computation is easy, and prefabrication is possible. <P>SOLUTION: The water spray type fire extinguishing facility is provided with piping and water spray nozzles to spray flowing water fed from the piping, where ends of the piping adjoining or in parallel to each other are connected to each other to compose a plurality of loops. Each piece of the piping is divided at a specified position to be a module for enabling prefabrication. Branch parts of the nozzles and bent parts of conduits are joined with each other by welding. Straight tubes are joined with each other by flange coupling and/or mechanical coupling. The branch parts are formed by burring, and the bent parts are formed by bending straight tube parts. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fire extinguishing equipment installed in a building or a dangerous article, and particularly relates to a water spray fire extinguishing equipment such as an indoor sprinkler equipment or a water spray fire extinguishing equipment such as a garage.

  Conventionally, sprinkler equipment is installed indoors or on the ceiling of a building, and is composed of a water source, a pressurized water supply device, piping, a flowing water detection device, a sprinkler head, a terminal test valve, a sprinkler dedicated water supply port, and the like. And the piping from the pressurized water feeding device to the sprinkler head is always pressurized and filled with the pressure of the pressurized water feeding device, and when the head is opened by heat, it is a device that starts watering immediately. The equipment is an automatic fire extinguishing system that can extinguish the fire completely before it grows.

  The piping of this type of equipment is equipped with a large number of heads, water distribution small pipes consisting of a single pipe closed at the end are arranged in parallel, they are arranged according to the indoor shape, and the other end is connected to the water distribution main pipe. A tree-shaped piping system was adopted. This method has been used easily because the hydraulic calculation is simple, but if a failure occurs in the middle of the pipe, the downstream of the pipe not only shuts down or diminishes, but also in the loss head of each branch pipe. There were also problems such as variations. In addition, since the pipe material is usually an iron pipe, the pipe lumen corroded and a rust was formed. In addition, if the connection of the head mounting branch is screw fitting, the thickness of the portion becomes thin at the threaded portion, which necessitates the use of a pipe with a large thickness. The weight has increased and the installation work has become inconvenient.

  In addition, in the invention described in Patent Document 1, it is disclosed that the separation pipe is piped in a non-flexible paddy shape. According to the sprinkling fire extinguishing equipment piped in the shape of a rice field, it is possible to mass-produce the U-shaped separation pipe at the factory, and it is only necessary to connect it to the liquid supply pipe at the site, making it easy to install the fire extinguishing equipment. It can be done. Furthermore, since an inflexible straight pipe is used and the flexible pipe is connected to the head at a short distance, there is an effect that pressure loss is reduced.

Japanese Patent No. 2754131

  However, in the invention described in Patent Document 1, it is disclosed that a multi-joint joint and an elbow are used for connecting straight pipes, and that the water supply pipe is flange-coupled at the center. As described above, when a multi-joint joint and an elbow are used for connecting straight pipes, there is a problem that pressure is lost. In addition, in the invention described in Patent Document 1, although it is described that the straight pipe is cut in the middle and connected by a flange that is integrally fixed to the cut end portion, Elbows must be used, causing pressure loss.

  Moreover, in invention of patent document 1, since water is supplied downward from the center part of a rice field-shaped installation, height is required. However, the present invention does not require much height because water flows in the horizontal direction.

  Accordingly, an object of the present invention is to provide a sprinkling fire extinguishing facility with a small pressure loss in order to solve the above problems.

  (1) In a sprinkling fire extinguishing system comprising a pipe and a water spray nozzle for sprinkling the flowing water sent from the pipe, a plurality of loops are formed by interconnecting the ends of the pipe with adjacent or parallel pipes. The said subject is solved by providing the sprinkling fire extinguishing equipment characterized by having performed. That is, a multiple loop is constituted by piping so that running water is circulated and branched.

  (2) By configuring the pipe of the above (1) with a stainless steel pipe, it is possible to provide a more effective sprinkling fire extinguishing facility.

  (3) The sprinkling fire extinguishing equipment according to (1) or (2), wherein the piping is modularized by dividing it at a predetermined position, and these can be prefabricated by a flange joint or a mechanical joint connection. This solves the problem.

  (4) A pipe line is formed by welding connection at the branch part and the bent part of the pipe according to (1) to (3), and the pipe line is configured by flange connection and / or mechanical connection at the straight pipe part. The said subject is solved by providing the sprinkling fire extinguishing equipment characterized.

  (5) The nozzle branch part is formed by burring the straight pipe part, and the bent part is formed by bendering the straight pipe part. The problem is solved by providing a sprinkling fire extinguishing facility.

  (1) Since the pipes are arranged in multiple loops so that running water circulates and branches, even if a failure occurs in the middle of the pipe, water is not cut off or water is reduced, and water is supplied to the watering point. it can. Moreover, since the loss head is almost constant everywhere, hydraulic calculation is easy.

  (2) By using a stainless steel pipe, it is possible to prevent clogging due to corrosion and rust, and to reduce the weight of the material. Furthermore, since the inner surface of the tube is smooth, the flow rate can be secured even if the tube diameter is small. As a result, even when a desired flow rate is ensured, the pipe diameter can be reduced as compared with pipes made of materials having other rough flat surfaces, thereby further reducing the weight of the material, It is advantageous for assembly.

  (3) Moreover, since the piping is divided and configured at a predetermined position, it can be modularized, can be prefabricated, and can be easily assembled. Since each module can be mass-produced, further cost reduction can be expected.

  (4) Friction loss resistance is low because the welded joint is formed at the nozzle branch and the bent part of the pipe and the pipe is formed by the flange joint and / or the mechanical joint at the straight pipe portion. Furthermore, since the thickness of the tube can be reduced, the friction loss resistance can be further reduced.

  (5) The nozzle branch is formed by burring the straight pipe part, and the bent part is formed by bendering the straight pipe part, so that the thickness can be reduced and the friction loss resistance can be reduced. it can.

  The present invention will be described with reference to the drawings. FIG. 1 is a piping diagram of the watering fire extinguishing equipment of the present invention. FIG. 2 is a plan view of the bending module. FIG. 3 is a plan view of a straight pipe module of piping. FIG. 4 is an enlarged view of the watering nozzle branching portion. FIG. 5 is a diagram of flange coupling.

  The pipe 1 of the present invention includes a straight pipe module 11, a bending module 12, and a watering nozzle 15. The straight pipe module 11 and the bending module 12 are combined to form a multiple loop as shown in FIG. At this time, it is desirable to lay the pipe parallel to the water supply direction. This is to reduce friction loss resistance due to bending. The coupling is performed by flange coupling or mechanical coupling shown in FIG. Of course, both bonds may be mixed on the same multiple loop. In the case of mechanical coupling, grooves are provided at both ends of the outer edge of the pipe, and the pipes are joined by a method of sandwiching the grooves with a joint and jointing the pipe. According to these couplings, no obstacles such as irregularities are brought into the pipe, so that friction loss can be reduced.

  The water supply may flow into the pipe from any direction, but in order to reduce the friction loss resistance, it is desirable to flow in from the same direction as the pipe direction.

  As shown in FIG. 2, the bending module 12 has a branch portion 14, and a flange 15 is provided at the end of the branch portion 14, so that the straight pipe module 11 can be connected to the flange. In this way, a plurality of parallel pipes can be laid. When connecting to a straight pipe, it is desirable to use a pipe having the same diameter.

  Further, the bending module 12 is obtained by bender processing of the straight pipe 11 and can reduce the friction loss resistance as compared with the case where the elbow or the multi-joint joint is used.

  As shown in FIG. 3, burring is performed on a predetermined portion of the straight pipe module 11. A flange portion formed by burring processing and the socket 13 are joined by welding, and a water spray nozzle 16 is attached to the end thereof. Of course, the socket 13 and the watering nozzle 16 may be appropriately connected by a single pipe or the like. The socket 13 is preferably smaller than the diameter of the straight pipe.

  The pipe is preferably made of stainless steel, but is not limited thereto, and may be a smooth surface. The smoothness is represented by a roughness coefficient. For example, a material having a high constant C (hereinafter referred to as flow velocity coefficient C) defined by the Hazen William formula shown in Table 1 (C = 120 or more). If so, it can be substituted. The flow rate coefficient C is 140 to 150 for material pipes with extremely smooth inner walls, 130 for new steel pipes, 100 for old steel pipes, and 60 to 80 for old steel pipes, and varies depending on the material. It is.

  The flow rate Q in the pipe can be obtained, for example, according to the following Hezen William formula.

Here, d is a circular diameter, and I is a hydraulic gradient. As is apparent from this equation, the flow rate is proportional to the flow velocity coefficient C, and if the flow velocity coefficient is high, that is, if the plane is smooth, the flow rate increases. Therefore, conversely, depending on the material of the pipe, the desired flow rate and flow velocity cannot be obtained even with the same pipe diameter. If the roughness coefficient is made large, the object can be achieved at the flow rate / flow velocity even if the pipe diameter is reduced.

For example, in a pipe made of C = 150 material, if the flow rate Q when the pipe diameter d = 200 mm and the hydraulic gradient I = 0.00219 is calculated, Q = 0.022 m ³ / s. If a material of C = 100 is used under the same conditions, the flow rate is 0.015 m ³ / s, and it can be seen that the difference in flow rate is caused by the difference in material.

  In the present invention, as shown in FIGS. 2 and 4, the friction loss resistance is reduced without using an elbow or a multi-joint joint by welding the nozzle branch portion and the bent portion of the pipe line. Furthermore, a loss head can be reduced by comprising a pipe line by flange connection and / or mechanical connection in a straight pipe part. Further, as shown in FIG. 2, the nozzle branch portion is formed by burring the straight pipe portion, and the friction loss resistance can be similarly reduced by bending the straight pipe portion with the bending portion.

  Next, a flow rate calculation method will be described. What influences the flow rate and flow rate in the pipe is the above-mentioned flow velocity coefficient that changes the pipe diameter to the smoothness of the inner surface, the pipe diameter, and the friction loss head of the pipe inner wall. Since the friction loss head greatly varies depending on the shape and smoothness of the branch portion of the pipe, it is necessary to consider the shape resistance of the nozzle branch portion when a large number of nozzles are mounted.

  The head loss of the straight line due to frictional resistance is determined by the Darcy Weissbach equation.

Here, R: head loss (kpa), d: pipe inner diameter (m), fs: friction loss coefficient, V = flow velocity of fluid in pipe (m / sec), l: pipe length (m), γ: fluid Specific gravity (in the case of water 0.98). The friction loss coefficient fs is a function of the Reynolds number Re and the tube wall roughness. The desired flow rate can be secured by using the one with the least loss head.

Table 2 shows the friction loss coefficient when the flow rate is constant and the same pipe diameter and hydrodynamic gradient. Table 2 shows data when the friction loss is calculated with Q = 900 m ³ / s as the desired flow rate.

Further, Table 3 shows data when the friction loss is calculated with Q = 1080 m ³ / s as a desired flow rate.

Comparing the amount of water flow depending on the wall thickness of the pipe, comparing the friction loss between the thickness of 3.5 mm and 1.2 mm in the pipe with a flow rate of 900 m ³ / s and the nominal diameter of 32, 44% of the friction loss head in the pipe Can be reduced. In addition, when comparing the friction loss between the thickness of 3.5 mm and 1.2 mm in the pipe having a nominal diameter of 40 mm, there is a reduction of 40%. Further, in the pipe having the nominal diameter of 50, the wall thickness is 3.8 mm and 1.2 mm. When comparing the friction losses, there is a reduction of 46%. A similar tendency can be seen when Q = 1080 m ³ / s shown in Table 3. From this, it is understood that the same amount of water can be secured even if the pipe diameter is small by using a thin pipe material.

  As in the present invention, the straight pipe module and the bending module are coupled by flange coupling and / or mechanical coupling, and further, the branch portion of the watering nozzle is provided by welding coupling and burring, thereby reducing the wall thickness of the pipe. And the friction loss resistance can be reduced.

  The value of the flow velocity coefficient of the buried pipe varies depending on the roughness of the pipe inner surface and the number of bends and branches in the pipe and the number of years of water flow. Generally, in the design using a new pipe, C = 110 for the entire pipeline including loss, etc., 130 is appropriate for the case of only the straight portion.

  As described above, the present invention can suppress the function and the manufacturing cost by a synergistic effect by using the pipe material having a high roughness coefficient and using the pipe material having a small thickness.

  As shown in FIG. 6, the friction loss resistance due to bending increases, but depending on the structure of the building, it is also possible to configure a multiple loop in which parallel pipes are made into mesh-like pipes that are orthogonal to each other. Even in this case, the friction loss resistance can be reduced by connecting the straight pipes by flange connection and / or mechanical connection, and connecting the nozzle branch portion by burring and welding.

  In this embodiment, a straight pipe module 11 is provided with a branch portion, and a flange is connected to another straight pipe module 11 or a bending module 12 by a cross straight pipe module 17 having a cross structure by providing a flange at the end thereof. It is desirable to do so.

It is the figure which showed the piping network of the watering fire extinguishing equipment which concerns on this invention. It is a figure of the direct part which constitutes the sprinkling fire extinguishing equipment concerning the present invention. It is a figure of the bent part which constitutes the sprinkling fire extinguishing equipment concerning the present invention. It is a figure of the branch part of the watering fire extinguishing equipment concerning the present invention. Diagram showing flange connection FIG. 3 is a diagram illustrating Example 1;

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sprinkling fire extinguishing equipment 11 Straight pipe module 12 Bending module 13 Socket 14 Branch part 15 Flange 16 Sprinkling nozzle 17 Cross straight pipe module

Claims (5)

In sprinkling fire extinguishing equipment comprising a pipe and a watering nozzle for sprinkling running water sent from the pipe, a plurality of loops are formed by interconnecting the ends of the pipes with adjacent or parallel pipes. Sprinkling fire extinguishing equipment. The sprinkling fire extinguishing equipment according to claim 1, wherein the pipe is made of a stainless steel pipe. The sprinkling fire extinguishing equipment according to claim 1 or 2, wherein the pipes are modularized by dividing them at predetermined positions, and they can be prefabricated by flange joints or mechanical joint joints. 4. A pipe line is formed by welding connection at a branching portion and a bent portion of a pipe, and the pipe line is formed by flange connection and / or mechanical connection at a straight pipe portion. Watering fire extinguishing equipment. The sprinkling fire extinguishing equipment according to any one of claims 1 to 4, wherein the straight pipe part is formed by burring to form a nozzle branch part, and the bent part is formed by bendering the straight pipe part. .

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