JPH0824359A - Spiral paid-off piping for sprinkler - Google Patents

Abstract

PURPOSE:To provide a spiral paid-off piping for sprinkler with which the problem of welding arc to be generated in the case of using a conventional stainless bellows tube or a single copper tube or the problem of the bucking or flattening of a bent part can be solved and the execution of piping is facilitated by reducing flow resistance. CONSTITUTION:Concerning the spiral paid-off piping for sprinkler, a branch pipe for supplying water and a sprinkler head are connected by a flexible pipe. Then, the flexible pipe is composed of an inside soft copper pipe 10 and a metallic flexible pipe 30 armouring the outer periphery of the soft copper pipe, and the soft copper pipe 10 forms a suitable bent part corresponding to a piping position between the branch pipe for supplying water and the sprinkler head so as to air-tightly connected them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unwinding pipe for a fire extinguishing sprinkler provided on the ceiling of a building or the like.

[0002]

2. Description of the Related Art An example of a sprinkler unwinding pipe disclosed in Japanese Patent Laid-Open No. 57-86668 is conventionally shown in FIG.
As shown in FIG. Ceilings 7 in buildings such as hotels and commercial buildings
It is compulsory to install the sprinkler head 9 in the. Since high-pressure water is jetted out to this sprinkler pipe, a main pipe branched from a high-pressure main pipe is generally arranged in the back of the ceiling, the branch pipe 6 is taken out from the main pipe, and the water supply branch pipe 6 to the sprinkler head 9 are connected. The space was guided by a sprinkler unwinding pipe. Here, a stainless steel bellows tube 1 has been proposed as a flexible tube.

In such an unwinding pipe, the installation position and length of the water supply branch pipe 6 and the sprinkler head 9 differ depending on the individual pipe place, and there are short places and long places of 1 m or more, depending on the pipe place. A flexible tube is used. Moreover, since the bellows part of the stainless steel bellows tube 1 expands when high-pressure water is applied, use a stainless steel bellows tube with a blade in which a stainless steel blade is coated on the outer surface of the stainless bellows tube 1 and both ends of the blade are fixed with metal fittings. There is.

[0004]

The above-mentioned conventional stainless steel bellows tube is usually thin with a thickness of about 0.1 to 0.3 mm. Therefore, when the arc is blown to the bellows part due to the welding work on the ceiling, etc., and if it passes through the stainless steel blade and reaches the thin walled bellows pipe 1 inside, there is a possibility of making a hole in the bellows pipe 1 through which water passes. There is a problem. Further, since water passes through the bellows tube 1, the natural flow overresistance becomes large when the bellows shape is formed. If the diameter of the stainless steel bellows tube 1 is increased in order to compensate for the flow-through resistance, there is a problem that the piping cost increases and the piping work becomes difficult.

Therefore, it is possible to use a copper tube instead of the bellows tube 1. Since the copper pipe has a wall thickness of about 0.8 to 1.0 mm, it has sufficient rigidity and strength without being covered with a blade unlike the stainless steel bellows pipe 1, and can sufficiently withstand high-pressure water. However, if the pipe up to the sprinkler head 9 is bent freely without a bender, the bending portion of the copper pipe is buckled and flattened, and the portion where the buckling is flattened narrows the flow path or cracks in the copper pipe. There was a problem of causing.

The present invention solves the problems of the welding arc and the buckling flatness of the bent portion when the above-mentioned stainless steel bellows tube or copper tube is used alone, and has a low flow resistance and easy piping. An object is to provide an unwinding pipe for a sprinkler.

[0007]

The gist of the present invention is to provide a sprinkler unwinding pipe for connecting a water supply branch pipe and a sprinkler head with a flexible pipe, wherein the flexible pipe is a soft copper pipe inside. The flexible copper pipe is attached to the outer circumference of the flexible copper pipe, and the flexible copper pipe is airtightly connected between the branch pipe for water supply and the sprinkler head by forming an appropriate bent portion according to the pipe position. This is a sprinkler unwinding pipe. In addition, both ends of the metal flexible tube are tightly fitted with no gap so as not to be exposed on the outer surface and are not moved so as to be housed in the fitting, or the outer circumference of the end of the metal flexible tube is directly compressed. The diameter can be reduced and pressure-bonded together with the inner soft copper tube for connection. Further, it is desirable to dispose a metal sleeve on the outer circumference of the end of the metal flexible tube, and compress and reduce the diameter of the sleeve so that the metal flexible tube is connected to the soft copper tube by crimping together with the sleeve. .

Among the flexible tubes, the soft copper tube is JIS H33.
It is possible to use C1220 which is a seamless pipe of copper and copper alloy specified in 00. Further, it is desirable that both ends of the soft copper pipe are hermetically connected to the joint fitting by flare seal connection. On the other hand, a flexible metal tube attached to the outer circumference of a soft copper tube is,
A flexible metal conduit tube specified by ISC8309 or a similar nonstandard product can be used. Also,
The larger the inner diameter of the metal flexible tube relative to the outer diameter of the soft copper tube, the easier the mounting. However, in the case of the present invention, it is almost 0 to 2.0 mm.
It is preferably about (a gap on one side). More preferably, it is 0 to 0.6 mm.

[0009]

Since the present invention has a structure in which a flexible metal tube is attached to the outer periphery of a soft copper tube as described above, when forming a bent portion according to the situation of each unwinding pipe, the soft copper tube is Since it is easier to bend than a copper pipe, it is easier to install. At this time, the outer peripheral surface of the soft copper tube is constrained and bent, and since the extreme bending below the minimum bending radius given to the metal flexible tube is not performed, buckling or breakage of the soft copper tube does not occur. Also,
The restraint state of the outer peripheral surface of the soft copper tube is influenced by the gap between the soft copper tube and the flexible metal tube. That is, this gap is 2.
If it is larger than 0 mm, the allowable bending amount approaches the minimum bending radius of the metal flexible tube, and the flatness of the soft copper tube is not regulated along with the bending, and there is a possibility that it will proceed as it is and eventually buckle. On the other hand, when the gap is 0, the metal flexible tube has a large bellows shape and extends a little in the radial direction, so that the flexible tube can be inserted into the soft copper tube by pushing and inserting it. In this case, since the outer peripheral surface of the soft copper tube is constrained by the flexible metal tube and bent together, the flatness of the soft copper tube is constantly regulated, and the soft copper tube is easily bent and does not progress to buckling.

Further, since both ends of the metal flexible tube are pressure-bonded and fixed to the soft copper tube, the metal flexible tube will not be displaced and the above-mentioned gap can be constantly kept constant. Further, since this is pressure bonding to the soft copper pipe, it can be easily performed only by compressing and reducing the diameter of the sleeve with a press or the like, and does not affect the subsequent assembling work or the like. Even if a welding arc is blown during other construction work and adheres to this unwound pipe after further piping, the flexible metal pipe on the outer side blocks the soft copper pipe on the inner side, so it is soft. It does not affect the copper pipe, and there is no problem of damage due to external factors such as scratches and nailing due to rubbing against other objects during piping work.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial sectional view of a sprinkler unwinding pipe showing a first embodiment of the present invention. A joint 21 for connecting to the side of the water supply branch pipe is attached to one end of the soft copper pipe 10, and a mounting pipe 71 for attaching a sprinkler head is attached to the other end of the soft copper pipe 10, and flare portions 11 and 12 at both ends are sandwiched by nuts 20 and 70 to be airtight. Connected to. Although the connection between the joint 21 and the mounting pipe 71 and the soft copper pipe 10 is a flare connection type joint in the illustrated embodiment, it may be a screw type or a union type joint using packing.

The inner soft copper pipe 10 uses C1220 specified in JIS H3300, and has good spreadability, bendability, drawability, weldability, corrosion resistance, and thermal conductivity, and is optimal as a water supply copper pipe. It is something. The nominal diameter of the soft copper tube 10 is 20 (standard outer diameter 22.22 mm).
If this is replaced with a stainless bellows tube, for example, the flow resistance of the bellows tube is large and the pressure loss during use is large. Problem occurs. In that respect, since the soft copper pipe 10 has little pressure loss and good bendability, it can be easily bent by hand according to the piping location without using a bender.

The outer metal flexible tube 30 is a JIS here.
It uses the same product as the metal flexible conduit tube specified in C8309. This is convenient because it has a relatively large minimum bending radius, is rigid, and can be easily and freely bent by hand without flattening. The outer diameter of the soft copper tube 10 is 2
The minimum inner diameter of the flexible metal tube is 22.4 for 2.22 mm.
mm. By using a metal flexible tube having an inner diameter larger than the outer diameter of the inner copper tube by about 0.1 mm (gap on one side), the bending of the soft copper tube while controlling the flatness of the soft copper tube by tight fitting. It has good properties and can prevent damage of the inserted soft copper tube due to external factors. Further, even when a bent portion is formed in the unwinding pipe as needed, the outer periphery of the soft copper pipe 10 is bent in a substantially constrained state, so that the soft copper pipe causes buckling flatness. There is no.

Further, for the metal flexible tube 30, the minimum bending radius given to the metal flexible tube can be selected by selecting the bending shape and the pitch of the folds on both sides of the hoop (steel strip) which is the material thereof. However, since it cannot be bent below its bending radius, the soft copper tube 10 is prevented from being bent excessively, and buckling damage does not occur. Therefore, it can be easily bent by hand according to the situation of piping without using a bender. Further, since the outer peripheral surface of the metal flexible tube 30 is the smooth uniform strip 31, it is excellent in handleability. Both ends 3 of the flexible metal tube 30
Reference numerals 2 and 33 are mounted in the nuts 20 and 70. The nuts 20 and 70 and the metal flexible tube 30 are mounted between the nuts 20 and 70 and the soft copper tube 10 so as to be freely rotatable.
It should be noted that both ends of the flexible metal tube 30 may be fixed to the outer peripheral surface of the soft copper tube 10 with bands or the like, or both outer circumferences of the flexible copper tube 10 may be pressed by a press machine or the like to be compression-reduced together with the soft copper tube and fixed by pressure. Is also good.
Further, depending on the connection type of the joints 21 and 71 at both ends, they may be fixed to this joint portion.

FIG. 2 is a partial sectional view of a sprinkler unwinding pipe showing another embodiment of the present invention. Since the left half is similar to the right half as shown in FIG. 1, it is omitted and the same parts are denoted by the same reference numerals. This embodiment shows an example in which both ends of the flexible metal tube 30 are fixed to the soft copper tube 10. The sleeve 4 has a protrusion 4 that is open at one end and protrudes toward the inner diameter at the other end.
It is a thin-walled cylindrical body made of an iron-based or non-ferrous metal having 0, and is a stopper for crimping and fixing the flexible metal tube 30 to the soft copper tube 10. The connection procedure will be described. First, the metal flexible tube 30 is inserted from one end of the soft copper tube 10 to position the metal flexible tube 30 at a predetermined position from the end of the soft copper tube, and the outer circumference of the end is covered. The sleeve 4 is arranged as shown in the figure, and the outer peripheral surface thereof is pressed by a pressing machine or the like to be compressed and reduced in diameter. Then, the metal flexible tube 30 is pressed against the soft copper tube and the sleeve 4
The protrusion 40 of the bite bites slightly into the soft copper tube and is fixed. After that, the end portion of the soft copper pipe 10 is flared, and the nut 20 and the joint 21 are used to maintain airtightness to complete the connection as shown in the figure.

Next, FIG. 3 is a perspective view showing an example in which the unwinding pipe for a sprinkler of the present invention is installed. Cheese 2 is connected to a branch pipe 6 that is appropriately branched from the main water supply pipe, and branch connection 3 having 5 connection ports (4 at the periphery and 1 at the lower end) is connected to this cheese 2 and the female screw of this connection port is connected. The male thread of the joint 21 of the unwinding pipe is connected to. One of the sprinkler head mounting tubes 71 is fixed to the fixing member 8 by using a fixing fitting 5 set so as to be at a predetermined position with respect to the ceiling surface. The other connection ports are also unwound pipes in the same manner as above, but at least one bent portion 15 is provided to avoid other pipes and beams.

[0017]

As described above, the unwinding pipe for sprinkler of the present invention does not cause bending buckling flatness of the soft copper pipe itself even when bending is performed, and after the pipe is formed, Even if the welding arc flies and adheres during other construction work, it does not affect the soft copper pipe inside, and also prevents damage problems due to external influences such as contact with other objects and nailing during piping work. However, the sprinkler unwinding piping can be easily and easily performed.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an unwinding pipe showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of unwinding pipe showing another embodiment of the present invention.

FIG. 3 is a perspective view showing a construction state of the unwinding pipe according to the present invention.

FIG. 4 is a diagram showing a connection example of a sprinkler pipe according to a conventional technique.

FIG. 5 is a view showing a conventional unwinding pipe for a sprinkler.

[Explanation of symbols]

2: Cheese 3: Branch joint 4: Sleeve 5: Fixing bracket 6: Branch pipe 7: Ceiling plate 8: Fixing material 9: Sprinkler head 1
0: Soft copper tube 11, 12: Flare part 20, 70: Nut 2
1, 71: Joint 30: Metal flexible tube 31: Strip of metal flexible tube 32, 33: Both ends of metal flexible tube 40:
Sleeve protrusion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuaki Morita 2 Daifuku, Kuwana City, Mie Prefecture Hitachi Metals Co., Ltd. Kuwana Factory

Claims (4)

[Claims] 1. A sprinkler unwinding pipe for connecting a water supply branch pipe and a sprinkler head by a flexible pipe, wherein the flexible pipe is an inner soft copper pipe and a metal attached to the outer periphery of the soft copper pipe. A flexible pipe, wherein the soft copper pipe is connected between the branch pipe for water supply and the sprinkler head to form an appropriate curved portion in accordance with the pipe position and is hermetically connected. Unwinding piping. 2. A sprinkler unwinding pipe for connecting a water supply branch pipe and a sprinkler head by a flexible pipe, wherein the flexible pipe is an inner soft copper pipe and a metal attached to the outer periphery of the soft copper pipe. A flexible tube made of metal, and the outer circumference of the end of the flexible tube made of metal is directly compressed and reduced in diameter to connect the flexible tube made of metal to the soft copper tube by crimping. An unwinding pipe for a sprinkler, characterized in that an appropriate bent portion is formed between the pipe and the sprinkler head in accordance with the position of the pipe to be hermetically connected. 3. A sprinkler unwinding pipe for connecting a water supply branch pipe and a sprinkler head by a flexible pipe, wherein the flexible pipe is an inner soft copper pipe and a metal attached to an outer periphery of the soft copper pipe. It consists of a flexible tube made of metal, and a metal sleeve is arranged on the outer circumference of the end of this flexible tube.
By compressing and reducing the diameter of this sleeve, a flexible tube made of metal is crimped and connected to a soft copper tube together with the sleeve, and the soft copper tube is appropriately connected between the branch pipe for water supply and the sprinkler head depending on the pipe position. An unwinding pipe for a sprinkler, which is characterized by forming a bent portion and being airtightly connected. 4. The unwinding pipe for a sprinkler according to claim 1, wherein a radial gap between the soft copper pipe and the metal flexible pipe is 0 to 2.0 mm (one side).