JPH0342314Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a frame body used when insulating the outer periphery of a cryogenic fluid pipe through which a cryogenic fluid such as a refrigerant for freezing or cold storage flows.

(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.

The general construction method for such insulation means is to wrap a heat insulating cover made of polystyrene foam etc. around the outer circumference of the pipe body, cover it with waterproof paper or cardboard and tie it together, and then wrap waterproof adhesive tape in a spiral shape. I'm finishing it.

However, such insulation means are extremely troublesome, time-consuming, and costly, and cannot prevent air from flowing in from the outside, leading to the risk of condensation forming on the outer circumferential surface of the pipe and corroding the pipe. As a result, re-construction was generally required within a short period of about one year.

In place of such heat insulation means, Japanese Patent Application Laid-Open No. 48-27351
As disclosed in the publication, protective covers are arranged at intervals on the outer peripheral surface of the tube, and a foaming solution such as polyurethane is injected and foamed between the tube and the protective cover to provide insulation. something is proposed. However, when injecting and foaming the foaming stock solution, the tube must be tilted in order to allow air to escape from the foaming space defined by the spacer as the foaming stock solution is injected. It was impossible to insulate the pipes after installing them in the building frame.

Therefore, the inventor of the present invention first constructed a tubular body using a disc-shaped frame made of polystyrene foam or hard urethane foam with a space cut out to allow the flow of the stock solution and the escape of air. attached to the outer periphery, supporting the cylindrical cover with the frame,
We proposed an insulation construction method that involves injecting a foaming solution into the space between the pipe body and the frame to cause foaming.

(Problems to be solved by the invention) The frame body used in the insulation construction method proposed by the present inventor is hollowed out in the middle and made up of an outer ring and an inner ring in order to improve the circulation of the raw solution and the escape of air. It is formed in a shape that connects the peripheral ring with a rim, but since the frame is made of polystyrene foam or hard urethane foam, it is not possible to reduce the wall thickness in consideration of strength, and there is a gap between the inner and outer peripheral rings. It was not possible to make the hollowed out space large enough. For this reason, the passage through which the injected foaming stock solution flows from one space to the other through the frame is narrow, resulting in poor flowability of the stock solution and hindrance to the work of pouring the stock solution. It's here.

(Means for Solving the Problems) This invention aims to solve the above problems, and consists of a frame made of two members joined to each other at appropriate intervals in the longitudinal direction of the cryogenic fluid pipe. A foaming space is provided on the outer periphery of the tube while supporting it by the frame, and a cylindrical cover is provided, and a foaming stock solution is injected into the foaming space and foamed to cover the outer peripheral surface of the tube. A frame for performing heat insulation construction, the frame consisting of two frame pieces joined together, each frame piece having a semicircular outer ring made of a heat insulating hard plastic board and a connecting plate extending in the diametrical direction. A semicircular recess corresponding to the outer periphery of the tube body is formed in the center of the connecting plate, a rectangular recess is formed at the outer end, and the two frame pieces are in contact with each other between the two recesses. It is characterized in that a projection is formed on one of the corresponding contact surfaces and a groove that fits into the projection is formed on the other contact surface.

(Function) Disc-shaped frames are attached to the outer periphery of the tube at intervals in the longitudinal direction, and a cylindrical cover is disposed on the outer periphery of the tube while being supported by the frame, and the cover and the frame are connected. A foaming stock solution is injected into the space defined by , and foaming is caused.
The frame body is made by joining two semicircular frame pieces connected by an outer ring and a connecting plate extending in the radial direction.
Since the area surrounded by the ring and the connecting plate is a space, the air escapes smoothly when pouring the stock solution, and this space also serves as a flow hole when pouring the stock solution. Since it is large, there is no possibility that the presence of the frame will interfere with the injection of the stock solution. In addition, since the frame piece is designed so that the connecting plates extending in the diametrical direction are joined by mutually fitting protrusions and grooves, it is extremely easy to attach the frame body to the pipe body, and the attachment is ensured. I can do it. Furthermore, a cutout recess is formed at the outer end of the joint surface of the connecting plate, and a foaming agent is injected into the cutout recess and foamed to seal the gap at the joint of the connecting plate at the outer end. , there is no risk of air flowing in from the outside through the gap.

(Effects of the invention) According to this 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 foaming is performed.
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, covers arranged at intervals around the outer periphery of the pipe are supported by a frame, and this frame has a semicircular outer periphery. Since it is a joined body of two-piece frame pieces consisting of a ring and a connecting plate, it is possible to inject the stock solution, escape the air associated with foaming, and flow the stock solution very well, ensuring high quality and reliability. A thermally insulating foam can be obtained. or,
Since the frame body is divided into two parts, it is easy to attach it to the pipe body, and a recess is provided at the outer end of the joint surface, and a foam layer is formed within this recess. the bonding gap is sealed at the outer end;
Since there is no risk of air flowing in from the outside through the joint gap of the frame, there is no risk of air coming into contact with the outer circumferential surface of the tube and causing dew condensation and corroding the tube.
It is possible to maintain a stable thermal insulation effect over a long period of time.

(Embodiments) Preferred embodiments of this invention will be described below with reference to the drawings. Referring to FIG. 1, 1 is a low-temperature 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 cooling device for home use, commercial use, etc. flows; A cryogenic fluid return pipe 3 extending parallel to the pipe 1 is arranged at appropriate intervals along the longitudinal direction of the cryogenic fluid pipe 1, e.g.
A frame attached to the outer circumference at intervals of 500m/m,
Reference numeral 4 denotes a cylindrical cover supported by the frame 3 and disposed at intervals around the outer periphery of the tube 1; The nozzle 6 of the stock solution injector 5 is inserted and the foaming stock solution is injected and foamed to form a foam heat insulating layer around the outer periphery of the tube body 1.

The cover 4 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 seen and the foaming state to be confirmed. .

As shown in FIG. 5, the frame body 3 is made up of two frame pieces 3a and 3b that have substantially the same semicircular shape, and each frame piece fits into the inner peripheral surface of the cover 4. It consists of a member made of a hard plastic plate in which a semicircular outer ring 7 supporting the pipe body 1 is connected by a connecting plate 8 extending in the diametrical direction. semicircular recess 9
is formed. Furthermore, first rectangular recesses 10 and 11 are formed continuously to the recess 9. Continuing outward in the radial direction of the first rectangular recesses 10 and 11,
Protrusions 12 and grooves 13 that fit into each other when joined
are formed, the two connecting plates 8 are joined by fitting the protrusions 12 and the grooves 13, and the frame pieces 3a, 3b are made circular and attached to the outer periphery of the tube body 1. Further, second rectangular recesses 16 and 17, which become notch recesses 14 and 15 at the time of joining, are formed at the outer end of the joining surface of the connecting plate 8, that is, on the outside of the protrusion 12 and the groove 13. Outer ring 7
The space 18 defined by the connecting plate 8 serves as a passage for the injected foaming stock solution and an escape passage for air during foaming, and is eventually filled with the foam.

The projections 12 and grooves 13 are fitted to form two connecting plates 8.
By joining, the frame pieces 3a and 3b are joined, and a circular frame 3 is constructed. By joining the connecting plates 8, a circular central hole 19 into which the tube 1 is inserted is created in the semicircular recess 9, and first rectangular recesses 10, 11 are continuous to the circular central hole 19 and radially outward.
Rectangular spaces 20 and 21 are created by
Cutout recesses 14, 15 are created by the rectangular recesses 16, 17. Reference numeral 22 denotes a heat insulating spacer inserted between the central hole 19 and the tubular body 1, and a spacer having an appropriate thickness is prepared according to the outer diameter of the tubular body 1. The rectangular spaces 20, 21 and the notched recesses 14, 15 are used as spaces for accommodating the return pipe 2, as shown in FIG.

The frame body 3 is formed of a thin hard resin plate or the like having the required strength and heat insulation properties.

The two connecting plates are joined by fitting the protrusions 12 and grooves 13, the tube body 1 is inserted into the central hole 19, the cover 4 is disposed and supported around its outer periphery, and a foaming stock solution is injected to foam. By foaming, a heat insulating foam layer is formed in the space around the outer periphery of the pipe body 1 defined by the frame body 3 and the cover 4, and at the same time, a heat insulating foam layer is formed in the space 18 of the frame body 3 and the center hole 1.
9. The rectangular spaces 20, 21 and the cutout recesses 14, 15 are also filled with foam.

In this way, the joint surface of the connecting plate 8 is insulated and insulated by the foam inserted into the central hole 19, the square spaces 20, 21, and the notched recesses 14, 15, and the return pipe 2 is also closed to the square spaces 20, 21 or the square spaces 20, 21. The foam that has entered into the cutout recesses 14 and 15 covers the outer circumferential surface thereof and provides heat insulation. Furthermore, the gap between the frame body 3 and the cover 4 is also filled with foam to provide heat insulation.
As a result, since the inflow of air from the outside is completely blocked, there is no possibility that dew condensation will occur due to contact between air and the outer peripheral surface of the tube body 1.

Furthermore, since the frame body 3 is made of a thin hard plastic plate, the space 18 surrounded by the outer circumferential ring 7 and the connecting plate 8 is sufficiently large, so that there is no risk of hindrance to the flow of the stock solution, and the frame body 3 is made of a thin hard plastic plate. Since the foaming stock solution flows through the body 3 and the stock solution injection efficiency is improved, the injection work is easy and the time can be shortened.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the insulation construction method according to this invention, Fig. 2 is a longitudinal sectional view, and Fig. 3 is Fig. 2-
FIG. 4 is a sectional view taken along the line of FIG. 2, and FIG. 5 is an exploded perspective view of the frame. 1...Pipe body, 2...Return pipe, 3...Frame body, 3
a, 3b... Frame piece, 4... Cover, 5... Stock solution injector, 6... Nozzle, 7... Outer ring, 8...
Connecting plate, 9... semicircular recess, 10, 11... first
Square recess, 12... protrusion, 13... groove, 14, 1
5... Notch recess, 16, 17... Second rectangular recess,
18... Space, 19... Central hole, 20, 21...
square space.

Claims (1)

[Scope of utility model registration request] A frame consisting of two members joined to each other at an appropriate interval in the longitudinal direction of the cryogenic fluid pipe is provided, and while supported by the frame, a foamed space is provided around the outer periphery of the pipe to form a cylindrical shape. A frame body for insulating the outer circumferential surface of a pipe body by disposing a cover and injecting a foaming stock solution into the foaming space to foam, the frame body consisting of two frame pieces joined together. , each frame piece consists of a semicircular outer circumferential ring made of a heat-insulating hard plastic plate and a connecting plate extending in the diametrical direction, with a semicircular recess corresponding to the outer periphery of the tube body formed in the center of the connecting plate, and a semicircular concave part at the outer end. A rectangular recess is formed, a contact surface on which the two frame pieces contact each other is formed between both recesses, a projection is formed on one of the contact surfaces, and a groove is fitted on the other contact surface to fit with the projection. A frame body characterized by forming.