JPS59974Y2 - cleaning unit case - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a cooling unit case for an air conditioner for an automobile or the like.

In general, this type of cooling unit 1, as shown in FIG. 1, includes a case outer body 2 made of synthetic resin, and a foamed heat insulating material 3 made of foamed polystyrene injection molded product fitted inside the outer body 2. A heat exchanger 5 is provided inside the foamed heat insulating material 3, and air is circulated through a window 6 formed in the casing 4.
A refrigerant is introduced into the heat exchanger 5 through the pipe 7 to cool the air.

By the way, when configuring such a casing 4,
A vacuum forming method is used as a method for making the foamed heat insulating material 3.

In this vacuum forming method, a foamed polystyrene sheet, etc. placed in a mold is heated and vacuum suctioned, but with the box-shaped foamed insulation material mentioned above, the sheet does not fully reach the bottom or corners. However, this part often becomes thin or torn.

For this reason, the assembly operation is complicated and damage may occur at thin parts.

In addition, not only is there insufficient thickness for insulation in thin parts, but the number of air bubbles is reduced and the thermal conductivity per unit thickness is also high, so the insulation properties of the product are insufficient. Ta.

Furthermore, in order to provide a drain passage 13 in the lower part of the case outer body, if a vertical piece 14 is provided on the inner surface of the lower part of the case outer body 2 and the lower inner surface is made into an uneven shape as shown in FIG. It is difficult to mold the manufactured foam insulation material 3 to match its uneven shape, and as shown in Fig. 3, a gap is created between the foam insulation material 3 and the outer body of the case, and drain water does not flow properly. This has caused problems such as damage to the insulation material due to the load on the heat exchanger.

Therefore, the present invention was devised to eliminate such defects by injecting polystyrene pre-mixed with a foaming agent and other chemicals into the gap between the male and female molds, and removing the inside of this gap. By heating and pressurizing and foaming after airing,
It is an object of the present invention to provide a cooling unit case having a foamed heat insulating material that has a uniform wall thickness and is in close contact with the outer body of the case without creating a gap.

Hereinafter, the cooling unit case according to the present invention will be explained with reference to the drawings.

FIG. 2 is a perspective view of essential parts showing one embodiment of the cooling unit case 10. This case 10 has a plastic case outer body 11 in the outermost shell, and the case outer body 11 is made of foam. A heat insulating material 12 is fitted.

In particular, in the present invention, when forming this foamed heat insulating material 12,
Do it as follows.

That is, polystyrene mixed with a foaming agent and other chemicals is injected into the space between the male mold and the female mold, and after the space is degassed, the polystyrene in the mold is heated and pressurized to foam.

In this way, injection molding can be performed while applying pressure at the same time as vacuum forming, and even if there are thin and small parts, the polystyrene is sufficiently drawn in, making it possible to perform precise molding.

Therefore, as shown in FIG.
Even when the foamed heat insulating material 12 is provided to cover the foamed heat insulating material 12, there will be no damage to the foamed heat insulating material 12.

In addition, the case outer body 11 has an uneven shape due to the vertical pieces 14.
Since the foamed heat insulating material 12 covers the lower inner surface without gaps along the uneven surface as shown in FIG. 4, the drain passage is not narrowed and the flow of drain water is not impaired.

According to experiments, it has been found that the thickness of the foam insulation material 12 in an automobile air conditioner is approximately 2 to 5 mm (preferably approximately 3 mm), and the thickness is optimal for forming such a thin material. It can be called a foam insulation material.

After forming the foamed heat insulating material 12, the ring unit case 10 is completed by fitting it into the case outer body 11 previously formed by injection molding.

As is clear from the above explanation, according to the present invention, the foamed insulation material of the cooling unit case of an automobile air conditioner etc. can be formed by using a combination of vacuum forming and injection molding. As a result, the foamed polystyrene is sufficiently distributed even in thin or narrow parts, making it possible to obtain a product with no damaged parts.In particular, since it is possible to make the wall thickness almost uniform, there is no heat inside. There is no looseness when storing the exchanger,
Also, since the restoring force is extremely large, it will not break and return to its original state even if the required deformation is applied.

For this reason, the adhesive to the case should be 1 to 2
One place is enough.

However, in the manufacturing process of foamed heat insulating materials, work can be performed reliably, yields are high, and product costs can be reduced to a distant degree, resulting in extremely excellent effects.

[Brief explanation of drawings]

Fig. 1 is a schematic vertical cross-sectional view of a cooling unit in an automotive air conditioner, Fig. 2 is a schematic perspective view of the main parts of a cooling unit case according to the present invention, and Fig. 3 is a drain passage in a conventional cooling unit case. FIG. 4 is a schematic cross-sectional view of the cooling unit case shown in FIG. 2. DESCRIPTION OF SYMBOLS 10... Cooling unit case, 11... Case outer body, 12... Foam insulation material.

Claims (1)

[Scope of utility model registration request] A 2 to 5 mm thick foam molded in the gap between a female mold having a mold surface that is almost the same as the uneven shape of the inner surface of the outer body of the case, and a male mold that is placed opposite the mold surface of the female mold at a certain distance. A cooling unit case in which a foamed heat insulating material having a substantially uniform wall thickness is fitted onto the inner surface of the outer body of the case without any gaps.