JPS5924128A - Casing roll for heat pump and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a casing roll for a heat pump air conditioner and a method for manufacturing the same.

In general, the casing roll of a heat pump air conditioner uses forced convection such as a cross-flow fan to transfer heat.
causes heat (capacity) leakage due to radiation. Especially in the case of the casing roll, which is the boundary between the indoor and outdoor sides of a heat pump air conditioner for windows, there is a large difference in the strength of forced convection on each side depending on the indoor and outdoor temperatures and heat exchange by the heat exchanger. becomes. In addition, in machines equipped with a heater, the heater becomes a radiation source, so the heat leakage is large, and it is necessary to consider the effects of heater heat such as thermal deformation and combustion. The structure is constructed by assembling several complex-shaped sheet metal parts, and then applying insulation treatment by painting the surface and attaching several complex-shaped insulation materials to prevent heat leakage. It had the disadvantage that it was complicated and the production cost was high.

The present invention was made in view of the above, and aims to provide a casing roll with a simple structure and less heat leakage, and a method for manufacturing the same.

The casing roll of the present invention is made by integrally molding a foam insulation material with a low thermal conductivity that prevents heat transfer by forced convection, and has a reflectance that prevents the incidence of energy due to radiation on the surface of the foam insulation material that is in contact with the high temperature side of the heat pump. It is characterized by being equipped with a large metal membrane body. Furthermore, the first manufacturing method according to the present invention is characterized in that, in manufacturing the casing roll as described above, a film body having at least one side of metal is tightly attached to one side of the mold for forming the foam insulation material. After that, the mold is filled with a foamed insulation material raw material and molded, and a metal film covering a predetermined surface of the foamed insulation material is substantially integrally molded. The feature of the method is that, in forming the metal film on the surface of the foam insulation material, a metal is vapor-deposited on a predetermined surface of the foam insulation material that has been formed by -1.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is an external perspective view of a casing roll according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line A-A.

Main body 1 integrally molded with foam insulation material such as styrofoam
The side and surface which should be in contact with the high temperature side of the heat pump are covered with a metal film body 2 over the entire area. This metal film body 2 is
It can be formed by integrally molding the main body 1 and then depositing metal on the surface of the main body 1 to be covered using a vacuum deposition method or the like.

Next, we will discuss the effect. FIG. 3 is a partially enlarged view of FIG. 2 described above. The left side in Figure 3 is the high temperature 1111 of the heat pump.
, the right side is also the low-temperature side, and if the @houses on each side are θ1 and θ2, the amount of heat transferred from the high-temperature side to the low-temperature side via this casing roll is equal to 1 unit for the heat passing heavy metal. When the area of the single roll is A, it is expressed as Q=-A・(θ1-02), and the heat transfer coefficient is α1 and α2% for the high temperature side and low side heat transfer coefficients, respectively. When the thermal conductivity of the heat insulating material 1 is λ and λ2, and the thicknesses of the metal film 2 and the foamed heat insulating material 1 are al and δ2, it is expressed as follows. Therefore, it can be seen that the heat transfer amount Q has a large heat transfer prevention effect even if the thickness δ1+δ2 is reduced by using a foamed heat insulating material with a low thermal conductivity.

In addition, for the energy input by radiation from heaters, etc., the heat flow density is ψR1, the Stefan-Polzmann constant is σ, the emissivity of the metal film body 2 is ε, the view factor is F1, and the supply temperature on the high wind side and the low wind side is Ta2, respectively. Assuming the trigram and Te3, it is expressed as ψR=σεF(Ta14-Ta24). Therefore, if the surface on the high temperature side is covered with a metal with low emissivity (high reflectance), the high temperature due to radiation (1
It can be seen that the energy incident on the low temperature side from 111 is small.

As described above, if configured as in the present invention, heat transfer due to forced convection is prevented by a foam insulation material such as heat conductive gloves, and energy input due to radiation is prevented by a metal film with a low emissivity. Heat leakage can be reasonably reduced, and the structure is made of film, so the manufacturing cost is also low.

In addition, in the above-mentioned example, as a method of forming a metal film on the surface of the foam insulation material, the case where metal is directly coated on the insulation material by vacuum evaporation etc. is described, but the method of forming the metal film is For example, the metal foil is used in -(f1
The metal foil may be brought into close contact with the surface using a cuum or the like, and then styrene beads treated with a foaming agent are filled into the mold, foamed by heating or the like, and molded integrally with the metal foil.

In this case, the metal foil is provided with a bent portion 21a as shown in FIG. 4(a), which is a perspective view of the main part of the metal foil 2'.
Drill an appropriate hole 2/b in this, and insert this bent part 27.
, is a sectional view of the main part of the casing roll in Fig. 4(b)! As shown in FIG. 1, if it is configured to be embedded inside the foamed heat insulating material 1, it is substantially integrally molded and the dense layer strength increases.

Furthermore, as another method for manufacturing the casing roll of the present invention,
One side of a sheet material made of a thermoplastic resin such as ABS resin or styrene may be coated with metal, and this may be integrally molded with the foam heat insulating material as described above. An example of this molding method will be explained based on a cross-sectional view of a mold for molding a foamed heat insulating material shown in FIG. Movable side and fixed side mold 11A
A plurality of protrusions 12.1 are provided at both ends or the peripheral edge of the movable side mold 11A of the mold for molding foam insulation material consisting of
2 is provided, and a thermoplastic resin sheet 14 coated with metal 13 on one side is fitted onto this protrusion 12.12. At this time, the length or area of the sheet 14 between the protrusions 12 is made to match the surface area of the gauging roll to be molded, that is, the surface area of the movable mold 11A. Next, move the movable mold 11A and combine it with the fixed mold 11B.
The peripheral edge portion 14A of the frame is suppressed and supported. Next, the movable side mold 11A
The sheet material 1 is suctioned by a vacuum device 15 provided in the
4 is brought into close contact with the side surface of the movable mold 11A. At this time,
If the sheet material 14 is heated continuously by the heating device 16 provided on the movable mold 11A, the sheet material 14 will become soft (thus, making it easier to adhere to the sheet material 14. As shown in FIG. 5, after the sheet material 14 has come into close contact, the foam material is The styrene beads containing Kl are filled into the mold through the filling port 17, and the styrene beads Kl are filled with appropriate steam pressure and heating.
Make it foam. By doing so, the foamed heat insulating material is fused to the sheet material 14, and substantially integrally formed. In addition, when this sheet material 14 is molded into only a part of the foamed heat insulating material, a metal film is formed on a predetermined part of the movable mold 11A, as shown in Fig. 6, which shows a part of the mold. A concave portion b corresponding to the area to be molded has a convex portion 19 on the outer periphery of the area, and a groove 20 into which the sheet material 14 can be inserted is provided in the convex portion to hold the sheet material 14. Then, mold it as described below.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a casing roll according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A, Fig. 3 is a partial enlarged view for explaining the operation, and Figs. 4(a) and (b). ) is an explanatory diagram showing an example of the method for manufacturing a casing roll of the present invention, No. 5
6 and 6 are explanatory diagrams showing an example of the H@ method according to the present invention. 1...Foam insulation material (main body) 2...Metal film body Patent applicant Sharp Corporation representative Patent attorney Nishi 1) Shin

Claims (1)

[Scope of Claims] (1) An integrally molded foam insulation material, a metal film covering at least a part of the surface of the foam insulation material that is in contact with the high temperature side of the heat pump, a polyacid film, and heat transfer by forced convection of the heat pump. 2) At least one side of the mold for molding the foam insulation material is placed on one side of the mold for molding the foam insulation material. 2. A casing roll for a heat pump in which a metal film is brought into close contact with the metal film body, and then a foamed insulation material raw material is filled into the mold and molded, and a metal film covering a predetermined surface of the foamed insulation material is substantially integrally molded. manufacturing method. (3) The method for manufacturing a casing roll for a heat pump according to claim 2, wherein the membrane is a metal foil. (4) The method for manufacturing a casing roll for a heat pump according to claim 2, wherein the membrane is a thermoplastic resin sheet coated with metal on one side. (5) A method for producing a casing roll for a heat pump, which comprises integrally molding a foamed heat insulating material and depositing metal on at least a portion of the surface thereof to form a metal film covering a portion of the surface of the foamed heat insulating material.