JP2014234835A - Orifice containing joint and sprinkler fire-fighting facility employing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily construct pressure reduction means.SOLUTION: In a sprinkler fire-fighting facility, a branch pipe which is branched from a water supply pipe to each floor of a building comprises a plurality of sprinkler heads and fire-fighting water is supplied to a sprinkler head which is operated by a pressurized water feeding device. The sprinkler head is connected to the branch pipe via an orifice containing joint 10. The orifice containing joint 10 is a joint including connections 15 and 16 in both end portions of a cylinder body 12 and formed annularly on an inner wall 12a of the cylinder body 12. An end portion 20 is chamfered and an orifice including a tapered surface is provided.

Description

  The present invention relates to an orifice-containing joint used for fire extinguishing equipment and the like and a sprinkler fire extinguishing equipment using the same.

  In the conventional sprinkler fire extinguishing equipment, a branch pipe branched from the water supply main pipe is disposed on each floor of the building, and a plurality of sprinkler heads are provided on the branch pipe. In the event of a fire, fire extinguishing water is pumped to the branch pipe by driving a pressurized water pump, and the fire extinguishing water is jetted from the sprinkler head toward the fire source.

In the sprinkler fire extinguishing equipment, when the water discharge pressure of the fire water from the sprinkler head is set to 0.5 to 4.5 kgf / cm ² (hereinafter referred to as a reference water discharge pressure), the water droplet diameter is 1.5 mm to 2.0 mm. Thus, it has been found that the fire extinguishing efficiency is good (for example, see Patent Document 1).

  In the case of a multi-story building, the water discharge pressure of the sprinkler head on the higher floor side is lower than that of the sprinkler head on the lower floor side. Therefore, the pressurized water pump is set so that the water discharge pressure of the sprinkler head on the upper floor side becomes the above-mentioned reference water discharge pressure. Since the water discharge pressure is exceeded, there is a problem in that the amount of ineffective water due to high pressure increases at the same time as the water discharge amount becomes excessive. Therefore, on the lower floor side, the above problem is solved by reducing the pressure near the sprinkler head.

  As the depressurization method, the space between the branch pipe and the sprinkler head is connected by a long flexible pipe having a length that reduces the pressure so as to become the reference water discharge pressure, or a space in which the flexible pipe is installed. Where there is no plate orifice is used.

JP-A-5-337214

  The flexible tube of the conventional example cannot be used when the space behind the ceiling is narrow or the ceiling does not exist on the skeleton ceiling. Moreover, in the said flexible pipe, it is necessary to bend so that it may not interfere with other piping, or to adjust the length so that it may become the said reference | standard water discharge pressure, and construction is troublesome. In addition, the plate orifice has a complicated operation such as connecting a pipe while suppressing the plate orifice, and there is a possibility that the attachment may be forgotten or dropped.

  In view of the above circumstances, an object of the present invention is to enable easy construction of a decompression unit.

  The present invention is a joint in which connection portions are provided at both ends of a cylinder main body, and an orifice formed in an annular shape on the inner wall of the cylinder main body and having a tapered surface with its end chamfered is provided. And

  The tapered surface of the present invention is formed by casting, forging, injection molding, or sintering with a tapered die. The orifice according to the present invention is characterized in that it is provided at an end of the cylinder body or between both ends.

  The present invention provides a sprinkler fire extinguishing facility in which a plurality of sprinkler heads are provided on branch pipes branched from water supply mains on each floor of a building, and supplies fire-extinguishing water to a sprinkler head operated by a pressurized water supply device. And is connected to the branch pipe via the orifice-containing joint.

  In the present invention, since the orifice is formed in the joint, it has a pressure reducing function and may be connected to each member, and the construction is easy. In addition, since it can be confirmed that the joint is connected from the outside, it is possible to easily check forgetting to mount. Further, by forming the tapered surface at the end of the orifice, the pressure regulation performance is not affected. Furthermore, since the tapered surface at the end of the orifice is formed by casting, forging, injection molding, or sintering with a tapered die, burrs are generated upstream of the orifice by machining the tapered surface. There is no effect on the pressure regulation performance.

It is a top view which shows 1st Embodiment of this invention. It is a longitudinal cross-sectional view. It is a bottom view. It is a longitudinal cross-sectional view which shows a part of sprinkler fire extinguishing equipment provided with the orifice inclusion joint. It is the schematic of a sprinkler fire extinguishing equipment. It is a longitudinal cross-sectional view which shows 2nd Embodiment of this invention, and is a figure equivalent to FIG.

  A first embodiment of the present invention will be described with reference to FIGS. A sprinkler fire extinguishing facility for a multi-story building is provided with a water supply main pipe 1, and the water supply main pipe 1 is provided with a pressurized water supply device (pump) 3. A branch pipe 5 is branched from the water supply main pipe 1, and the branch pipe 5 is disposed on the back side of the ceiling F of each floor. A plurality of sprinkler heads 7 are connected to the branch pipe 5 at a predetermined interval, and the sprinkler heads 7 are exposed from the ceiling F.

  The sprinkler head 7 is a closed type sprinkler head that is opened by repelling the sealing member (not shown) by fire heat. The branch pipe 5 and the sprinkler head 7 are connected via a joint 10 (orifice inclusion joint). The joint 10 is connected to the branch pipe 5 through the connecting pipe 24 as necessary. In the first embodiment, the branch pipe 5 side of the joint 10 will be described as upstream, and the sprinkler head 7 side will be described as downstream.

  The joint 10 is an orifice-containing joint in which a cylinder body 12 and an orifice 14 are integrally formed. Connection portions 15 and 16 are formed at both ends of the cylinder body 12. The connection portion 15 is formed with a male screw, and the connection portion 16 is formed with a female screw. A hexagonal spanner engaging portion 18 projects from the outer periphery of the cylinder body 12, and the spanner engaging portion 18 is disposed at a position sandwiched between the connecting portions 15 and 16. .

  The orifice 14 is formed in an annular shape on the inner wall 12a near the upper end on the upstream side of the cylinder body 12, and the upper surface 20a and the lower surface 20b of the end 20 are chamfered to form a tapered surface. The inclination angles of the upper surface 20a and the lower surface 20b are appropriately selected as necessary. When the orifice 14 is manufactured, a tapered surface is formed by casting, forging, injection molding, sintering, or the like using a tapered die. By forming the orifice 14 in this way, no burr is generated in the orifice 14.

  If necessary, the end portion 20 is cut and formed so that the orifice inner diameter φ becomes a predetermined size by machining (for example, cutting using a drill) from the upstream side toward the downstream side. The reason why the orifice 14 is formed in this way is that if cutting is performed from the downstream side to the upstream side and the orifice inner diameter φ is cut to a predetermined size, burrs may be generated on the upstream side of the orifice. Because there is.

  If a burr occurs on the upstream side of the orifice 14, the flow of fire-extinguishing water to the orifice 14 is hindered and the designed performance (decompression performance) is not achieved. However, even if a burr occurs on the downstream side, the burr is extinguished. There is no change in performance because it does not hinder the inflow of water and the tapered surface on the downstream side has little influence on the flowing water of the fire extinguishing water.

  Here, the effect of forming tapered surfaces at both ends of the orifice 14 will be described. If the orifice 14 has no tapered surface and the upper end and the lower end of the end 20 are 90 degrees square, the corners may be slightly cut when the orifice inner diameter is increased or burrs are removed. If it becomes tapered and rounded, inflow of fire-extinguishing water into the orifice 14 becomes extremely easy, and the pressure reduction performance by the orifice 14 changes greatly.

  On the other hand, when the tapered surface is formed in advance on the orifice 14, since the tapered surface of the orifice 14 is greatly involved in the inflow of the fire-extinguishing water, any one of the corner portions 20c, 20d, 20e, and 20f of the orifice 14 is used. Even if the angle changes slightly, the effect on the inflow of fire extinguishing water is small and the performance does not change.

  Due to the effect of providing the tapered surface as described above, when machining is performed from the downstream side to the upstream side to make the orifice inner diameter φ a predetermined size, burrs are temporarily generated on the upstream side of the orifice 14. Even if the burr is removed and the corner portion 20c or 20d is rounded, the performance does not change.

  Further, when the upper surface 20a is formed by machining without using a mold, it may cause burrs on the upstream side or the end portion 20 of the orifice 14. When the burr occurs, the orifice inner diameter φ does not become a predetermined size, or the inflow of the fire-extinguishing water is hindered, and machining is required again to remove the burr, resulting in an increase in processes and cost. It becomes.

  The downstream side of the orifice 14 is a rectifying unit 22 that adjusts the flow of turbulent fire extinguishing water ejected from the orifice 14 to make a laminar flow state. The rectifying part 22 is formed by forming the orifice 14 in the vicinity of the upper end part of the joint 10. When the flow speed of the fire-extinguishing water flowing into the orifice is 1.5 m / s to 2.5 m / s, which is a general flow regulating section, about 5 times the diameter of the flow path is a standard. However, when the flow velocity is higher or when fire extinguishing water that has already become turbulent flows, a longer distance is required, and about 20 times the maximum is required.

  The joint 10 is configured so that the fire-extinguishing water passes through the orifice 14 so as to become a predetermined pressure or less, and functions as a so-called limiter. In the present embodiment, since the joint 10 is a bush-type joint, the length of the cylinder body 12 can be shortened.

  Next, the operation of this embodiment will be described. A fire detector (not shown) detects a fire and sends a fire signal to the control panel. When the control panel receives the fire signal, it opens a pre-actuating valve (not shown) provided on the proximal end side of the branch pipe 5. When the sprinkler head 7 is opened due to a fire, the water filled from the sprinkler head 7 is discharged, whereby the inside of the branch pipe is decompressed. When this pressure drop is detected by a pressure switch of a pressure air tank (not shown), a pressure drop signal is sent to the control panel to activate the pressurized water supply device 3. Then, the pressurized water supply device 3 pressure-feeds the fire extinguishing water from the water source 25 to the branch pipes 5 on each floor through the water supply main pipe 1.

  The fire-extinguishing water pumped to the branch pipe 5 is directed to each sprinkler head 7 and ejected from the sprinkler head 7 which is opened by being repelled by fire heat. At this time, the fire-extinguishing water that has flowed into the joint 10 from the branch pipe 5 through the connecting pipe 24 is squeezed while being restricted by the orifice 14 and then suddenly released to become a turbulent flow. In this state, the sprinkler head 7 is entered. Therefore, the fire extinguishing water ejected from the sprinkler head 7 is sprinkled with a water discharge pattern according to the design.

  A second embodiment of the present invention will be described with reference to FIG. 6. The same reference numerals as those in FIGS. 1 to 5 have the same names and functions. The difference between this embodiment and the first embodiment is that in the first embodiment, the screw of the connecting portion 16 is a female screw, whereas in this embodiment, the connecting portion 26 is a male screw. is there. This joint 10A is a hexagonal nipple type joint.

The embodiment of the present invention is not limited to the above, and may be as follows, for example.
(1) The arrangement of the orifice-containing joint is reversed from that of the above embodiment, the orifice side is set to the downstream side, and the rectifying unit side is set to the upstream side. For example, in the vicinity of the upstream side of the foam aqueous solution mixer, the orifice 14 of the joint is disposed on the outlet side (downstream side) so that turbulent fire extinguishing water enters the mixer, It is possible to improve the mixing of the foam aqueous solution. In addition, when arranged on the upstream side of the foam head, the effect of miniaturizing the foam due to turbulent flow is obtained, and the aqueous foam solution contacts the net part of the head while diffusing, so that it passes through the net in a liquid state. The solution decreases and foams efficiently.

(2) Although the closed sprinkler head has been described in the above embodiment, the present invention can also be applied to an open sprinkler head. In addition to the sprinkler head, for example, it can be used to connect a nozzle.
(3) In the said embodiment, although the screw was illustrated as a connection part of a coupling, it is not limited to this.

  (4) In the above-described embodiment, the case where there is one orifice has been described. However, a plurality of orifices may be arranged at intervals (multistage type). Further, the position of the orifice can be changed, and the end (upper end, lower end) of the cylinder body, or between both ends, for example, the center of the cylinder body (1/2 of the axial length). It may be arranged at the position).

(5) When the piping of the fire extinguishing equipment is made narrow, the water supply pressure of the pressurized water supply device must be increased, but by using the joint 10 of the present invention, the water discharge pressure at each level can be maintained below a predetermined level. it can. That is, by using the joint 10 of the present invention for the fire extinguishing equipment, it is possible to reduce the cost of the fire extinguishing equipment by narrowing the piping.
(6) When the present invention is used, since the sprinkler heads at each level only have a water discharge pressure equal to or lower than a predetermined pressure, a common sprinkler head that can withstand the water discharge pressure can be used.

DESCRIPTION OF SYMBOLS 1 Water supply main pipe 3 Pressurized water supply apparatus 5 Branch pipe 10 Joint 12 Cylinder main body 12a Inner wall 14 Orifice 15 Connection part 16 Connection part 20 End part 20a Upper surface 20b Lower surface 22 Current adjustment part

Claims (4)

A joint provided with connecting portions at both ends of the cylinder body,
An orifice-containing joint characterized in that an orifice having an annular shape and a chamfered end and a tapered surface is provided on the inner wall of the cylinder body.   3. The orifice-containing joint according to claim 2, wherein the tapered surface is formed by casting, forging, injection molding, or sintering using a tapered mold.   The orifice-containing joint according to claim 1 or 2, wherein the orifice is provided between an end of the cylinder body or between both ends. In the sprinkler fire extinguishing equipment, in which a plurality of sprinkler heads are provided on the branch pipes branched from the water supply mains on each floor of the building, and the fire water is supplied to the sprinkler heads operated by the pressurized water supply device.
The sprinkler fire extinguishing equipment, wherein the sprinkler head is connected to the branch pipe via the orifice-containing joint according to claim 1, 2 or 3.

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