JPH0359320B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an insulation construction method for insulating the outer periphery of a cryogenic fluid pipe through which a cryogenic fluid pipe such as a refrigerant for freezing or cold storage flows. Regarding frame materials used for insulation construction.

(Prior Art) Conventionally, a cryogenic fluid pipe through which a cryogenic fluid such as a refrigerant for freezing or cold storage flows has been provided with a heat insulating means to prevent heat radiation from the outer peripheral surface of the pipe.

As shown in FIG. 5, the general construction method for such a heat insulating means is to attach a two-part heat insulating cover 2 made of expanded polystyrene to the outer periphery of the tube body 1, bind it with iron wire 3, and then attach the cover 2 to the outer circumference of the tube body 1. Waterproof paper 4 is wrapped around the outer periphery and tied with iron wire 5, the outer periphery of the waterproof paper 4 is further covered with cardboard 6 and tied with iron wire 7, and finally waterproof adhesive tape 8 is applied around the outer periphery of the cardboard 6. Finished by wrapping it in a spiral. However, such insulation methods
Since it is very troublesome and time-consuming, it is unavoidable that the cost will increase, and since it is not possible to completely prevent the inflow of air from the outside, the inflowing air comes into contact with the outer peripheral surface of the tube body 1. There was a risk that condensation would occur and corrode the tube body 1. For this reason, conventional insulation methods generally require re-turning within a short period of about one year.

Therefore, instead of such a heat insulation method, a method has been proposed in which a frame body is formed on the outer peripheral surface of the pipe body 1 and a foaming solution such as polyurethane is injected into the pipe body 1 to cause foaming to provide heat insulation. It is disclosed in Publication No. 48-27351 and the like.

(Problems to be Solved by the Invention) However, in the conventional method of foaming by injecting a foaming stock solution into the outer peripheral surface of a tube, air escape from the space partitioned by spacers is improved. Because it is necessary to incline the pipe body, it was not possible to perform insulation lathing after the pipe body was installed inside the building frame. Furthermore, it is necessary to attach a plurality of supporting spacers to support the protective cover on the outer peripheral surface of the tube whose ends are partitioned by two spacers.

This invention eliminates the drawbacks seen in the conventional insulation lathing method, can completely block the flow of air from the outside, and also reliably allows air to escape when the injected foaming stock solution foams. Another object of the present invention is to provide a method for easily and reliably insulating the outer periphery of a tube body, and a frame material for the same.

(Means for Solving the Problems) In order to solve the above problems, the means taken by the first invention is that the inner circumferential ring that contacts the outer circumferential surface of the cryogenic fluid pipe and the inner circumferential surface of the cylindrical cover contact the A frame body made of a foamed heat insulating material is formed by connecting the contacting outer circumferential ring with a rim extending in the radial direction to form a two-part shape, and forming notches at the inner and outer ends of the joint surface of the two halves. A cylindrical cover is attached to the outer circumference of the pipe at appropriate intervals and supported by the outer ring of the frame, and a cylindrical cover is placed outside the cryogenic fluid pipe, and an insulating foaming solution is placed inside the cover. It is characterized in that it is injected and foamed to form a heat insulating foam layer on the outer periphery of the cryogenic fluid pipe and in the notch.

In addition, the means taken by the second invention is to attach a frame body to the outer periphery of the cryogenic fluid pipe at appropriate intervals, and while supporting it with the outer peripheral ring of the frame body, attach the cylindrical cover to the outside of the cryogenic fluid pipe. A frame body for a heat insulation construction method for a cryogenic fluid pipe, in which a heat insulating foaming solution inside the cover is injected and foamed to form a heat insulating foam layer on the outer periphery of the cryogenic fluid pipe. An inner circumferential ring that abuts the outer circumferential surface of the cryogenic fluid pipe and an outer circumferential ring that abuts the inner circumferential surface of the cylindrical cover are connected by a radially extending rim, and a center of the diametrically extending rim It consists of two frame pieces made of foam insulation material that are split into two halves, with cutouts formed at the inner and outer ends of the joint surfaces of the frame pieces, and a protrusion on one of the joint surfaces and a protrusion on the other. A feature is that a groove is formed on the joint surface to fit with the protrusion.

(Function) A cylindrical frame is attached to the outer periphery of the cryogenic fluid pipe at intervals in the longitudinal direction, and a cylindrical cover is disposed on the outer periphery of the pipe while being supported by the frame, and the cover and frame are supported by the cylindrical frame. A foaming stock solution is injected into the space defined by and foamed. The frame is made of foam insulation material and has an outer ring and an inner ring connected by a rim extending in the radial direction, and the space surrounded by the rings and rims prevents air from escaping when the stock solution is injected. The injection is carried out smoothly without any problems, and since the space serves as an injection hole when injecting the stock solution, there is no possibility that the presence of the frame will interfere with the injection of the stock solution. Further, the frame body is divided into two parts at the center of two rims located on a straight line, and a protrusion is fitted on one of the joint surfaces of the divided frame pieces, and the protrusion is fitted on the other joint surface. Since the groove is formed, it is extremely easy to attach the frame to the tube, and the attachment can be ensured. Furthermore, a cutout is formed at the inner and outer ends of the joint surfaces of the divided frame pieces and spans the frame pieces, and a foaming agent is injected into the cutout and foamed to fill the gap between the joints of the frame pieces. Since the inner and outer ends are sealed, there is no risk of air flowing in from the outside through the gap, and since it is a foamed heat insulating material, heat transfer to the outer cover can also be prevented.

(Effects of the Invention) According to the present invention, a foaming stock solution is injected into the outer periphery of a pipe through which a low-temperature fluid such as a refrigerant flows, and the foaming solution is foamed.
In addition to being able to directly form the heat insulating layer, the heat insulating layer can be formed extremely easily, and can be formed even when the pipe is disposed in the building frame. Furthermore, in order to demarcate a space for forming a heat insulating layer around the outer periphery of the pipe, a frame supports a cover arranged at intervals around the outer periphery of the pipe, and this frame connects the outer ring and the inner ring. Since it has a shape in which the surrounding ring is connected by a rim, injection of the stock solution and escape of air accompanying foaming can be performed extremely well, and a high quality and reliable heat insulating foam can be obtained. In addition, since the frame body is divided into two parts, it is easy to attach it to the tube body, and cutouts are provided at the inner and outer ends of the joint surface, so that a foam layer can be formed inside these cutouts as well. Since the joint gap is sealed at the inner and outer ends, there is no risk of air flowing in from the outside through the joint gap of the frame, so air will come into contact with the outer circumferential surface of the tube and condense. This eliminates the risk of corrosion of the pipe body, and allows stable insulation to be maintained over a long period of time.

(Embodiments) Preferred embodiments of the present invention will be described below with reference to the drawings. Referring to Figure 1, 10
Reference numeral 11 indicates a cryogenic fluid pipe through which a low-temperature fluid such as a refrigerant or water to be supplied to a refrigerator, a cold storage, or a home or commercial cooling device flows;
A cryogenic fluid return pipe 12 extending parallel to the cryogenic fluid pipe 10 is provided at an appropriate interval, e.g.
Frame bodies installed at intervals of 500m/m, 13
is a cylindrical cover supported by the frame 12 and disposed at intervals around the outer periphery of the tube 10, and in the foaming space between the cover 13 and the tube 10, a foaming stock solution is placed. The nozzle 15 of the injector 14 is inserted and the foaming stock solution is injected and foamed to form a foamed heat insulating layer around the outer periphery of the tube body 10.

The cover 13 may be made of any material as long as it can withstand the expansion pressure during foaming, but a transparent or translucent plastic cover is preferable because it allows the foaming state to be visually recognized and the foaming state to be confirmed. .

As shown in FIG. 4, the frame body 12 includes an inner circumferential ring 16 that fits on the outer circumferential surface of the tube body 10, and a cover 13.
An outer circumferential ring 17 that fits on the inner circumferential surface of the rim is connected by four rims 18 and 19 extending in the radial direction,
It consists of two frame pieces 12a and 12b divided into left and right halves at the center of two linearly extending rims 18. A protrusion 20 and a groove 21 that fit into each other are formed on the joint surfaces of the divided rim 18, and the rim 18 is attached to the outer periphery of the tubular body 10 by fitting the protrusion 20 and the groove 21 together.
Further, cutout portions 22 and 23 which become notches 27 and 28 at the time of bonding are provided at the inner and outer ends of the joint surfaces of the split rim 18.
is formed. Inner and outer rings 16, 17 and rim 1
A space 24 divided by 8 and 19 is for injection of foaming stock solution,
It serves as an inlet for air to escape during foaming and an inlet for raw solution, and is eventually filled with foam. Reference numeral 25 denotes a semicircular notch recess formed in the outer ring 17, through which the return pipe 11 is inserted.

The frame body 12 is made of a material having the required strength and heat insulation properties,
Preferably, it is made of polystyrene foam, hard urethane foam, or the like.

The two frame pieces 12a and 12b are attached to the outer periphery of the tubular body 10 while fitting the projections 20 and the grooves 21, a cover 13 is disposed and supported on the outer periphery, and a foaming stock solution is injected to form foam. Frame 12 and cover 1 are formed by foaming.
A heat insulating foam layer 26 is formed within the space around the outer periphery of the tube body 10 divided by 3, and the space 2 of the frame 12 is
4 as well as the notches 27, 28 and the notch recess 25 are filled with the foam.

In this way, the bonding surface of the frame 12 is insulated and insulated by the foam inserted into the notches 27 and 28 at the inner and outer ends of the bonding gap, and the return pipe 11
The outer circumferential surface of the notched recess 25 is covered with the foam that has entered into the notched recess 25 and is thermally insulated. Furthermore, the gap between the frame body 12 and the cover 13 is also filled with foam and is thermally insulated.
As a result, the inflow of air from the outside is completely blocked, so there is no possibility of condensation occurring due to contact between air and the outer peripheral surface of the tube body 10.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the insulation construction method according to the present invention, Fig. 2 is a longitudinal sectional view at the frame body position, and Fig. 3
The drawings are a sectional view taken along the line of FIG. 2, FIG. 4 is an exploded perspective view of the frame, and FIG. 5 is a perspective view showing a conventional heat-insulating turning method. 10...Pipe body, 11...Return pipe, 12...Frame body, 13
... Cover, 14 ... Stock solution injection device, 15 ... Nozzle,
16...Inner circumference ring, 17...Outer circumference ring, 18,1
9...Rim, 20...Protrusion, 21...Groove, 22, 23...
Cutout portion, 24... Space, 25... Notch recess, 26... Foam layer, 27, 28... Notch portion.

Claims (1)

[Claims] 1. An inner ring that contacts the outer peripheral surface of the cryogenic fluid pipe and an outer peripheral ring that contacts the inner peripheral surface of the cylindrical cover are connected by a rim extending in the radial direction to form a two-part shape. A frame made of foamed heat insulating material with cutouts formed at the inner and outer ends of the two halves of the joint surface is attached to the outer periphery of the cryogenic fluid pipe at an appropriate interval, and supported by the outer ring of the frame. At the same time, a cylindrical cover is disposed outside the cryogenic fluid pipe, and a heat insulating foaming solution is injected into the cover and foamed, thereby forming a heat insulating foam layer on the outer periphery of the cryogenic fluid pipe and in the notch. 1. A method for insulating a cryogenic fluid pipe, the method comprising: forming a cryogenic fluid pipe; 2. Attach the frame to the outer circumference of the cryogenic fluid pipe at appropriate intervals, and while supporting it with the outer ring of the frame, arrange a cylindrical cover on the outside of the cryogenic fluid pipe, and place a cylindrical cover inside the cover. A frame body for an insulation construction method for a cryogenic fluid pipe in which a heat insulating foaming solution is injected and foamed to form a heat insulating foam layer on the outer periphery of the cryogenic fluid pipe, the outer periphery of the cryogenic fluid pipe being an inner circumferential ring that abuts the surface and an outer circumferential ring that abuts the inner circumferential surface of the cylindrical cover are connected by a rim extending in the radial direction;
It consists of two frame pieces made of foam insulation material that are split in the center of the rim that extends in the diametrical direction.
1. A frame body characterized in that notches are formed at the inner and outer ends of the joint surfaces of the frame pieces, and a protrusion is formed on one of the joint surfaces, and a groove that fits with the projection is formed on the other joint surface.