JPH07237230A - Refrigerator - Google Patents

Abstract

PURPOSE:To ensure that no leakage occurs even when a foamed heat insulating material whose start of foaming is quicker than a conventional are is used by providing an injection aperture seal so that the foam heat insulating material does not leak from the injection aperture through which the heat insulating material is injected into a refrigerator at the time of injection. CONSTITUTION:An injection aperture seal 13 is bonded around all the entire periphery of an injection aperture 9. In addition, a cross slit 15 is formed in the center of the injection aperture. A contact area with an injection head 11 is larger than that with a tongue-shaped injection aperture seal which is used conventionally and installed in a cantilever state. Consequently, a clearance around the injection head 11 is small. Further, a layer of a material with a low modulus of elasticity is provided on the rear of the injection aperture seal 13 and therefore, the contact area can be made larger. In addition, the injection aperture seal 13 is prevented from becoming swollen due to the pressure of the foamed heat insulating material, so that a plate material with a high modulus of elasticity is provided on the rear of the injection aperture seal 13 in a cantilever state to reinforce the injection aperture 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an inlet for injecting a foam insulating material between an inner box and an outer box of a refrigerator.

[0002]

2. Description of the Related Art A conventional operation of injecting a foamed insulating material between an inner box and an outer box of a refrigerator will be described with reference to FIGS. As is well known, the foam insulation 3 is used for the refrigerator 1. The foamed heat insulating material 3 is injected between the inner box 5 and the outer box 7 which form the refrigerator 1. As shown in FIG. 8, this pouring operation is performed by inserting the pouring head 11 into the pouring port 9 formed on the back side with the back side of the refrigerator 1 facing upward.

As shown in FIG. 9, an inlet seal 13 is provided inside the inlet 9. The injection port seal 13 is a resin sheet formed in a tongue shape, and is provided in a cantilever state in which only one side is bonded. When injecting the foamed heat insulating material 3, the injection head 11 is inserted so as to push down the injection port seal 13. The foamed heat insulating material 3 is liquid at the time of injection, and then foams and rises. The pressure at the time of foaming pushed up the injection port seal 13 to close the injection port 9 and prevent the foam heat insulating material 3 from leaking to the outside.

[0004]

However, in recent years,
Specified CFC HCFC in comparison with current R-11 foam insulation
-142b / 22 There is a need to use foam insulation. If this latter foam insulation is used, it will evaporate at room temperature (23.5 ° C) because it has a boiling point of 0 ° C or less. Done. Therefore, during the injection, the foam heat insulating material 3 splashes from the injection port 9 (FIG. 9), and the foam heat insulating material 3
May leak (FIG. 10), and thus the foam heat insulating material 3 may adhere to the outside of the injection head 11 and the injection port 9.
If such adhesion occurs, there is a risk that it will be difficult to perform the next injection work into the refrigerator using the same injection head 11 or the refrigerator 1 will be defective as a product. This invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a refrigerator in which foamed insulation does not easily adhere to the outside of the injection head and the injection port of the refrigerator.

[0005]

The present invention has been made to achieve the above object, and the invention of claim 1 provides a foamed heat insulating material between an inner box and an outer box constituting a refrigerator. An injection port for injection is formed, and an elastic injection port seal that closes the injection port is provided by being adhered to the entire circumference of the injection port, and the injection head for performing the injection is inserted in the center of the injection port seal. It is characterized in that a notch for cutting is formed.

The invention according to claim 2 is further characterized in that a layer made of a material having a smaller elastic coefficient than that of the inlet seal is provided on the surface of the inlet seal on the side in contact with the foamed heat insulating material.
According to the invention of claim 3, a tongue-shaped plate material having a larger elastic coefficient than that of the inlet seal is provided on the surface of the inlet seal on the side in contact with the foamed heat insulating material in a cantilever state so as to close the notch. Characterize.

[0007]

According to the first aspect of the present invention, both sides of the notch can contact the injecting head when the injecting head is inserted into the notch of the inlet seal. By this contact, the injection head,
A gap is less likely to occur between the inlet seals, and splashing or leakage of the foam insulating material is less likely to occur. Further, when the injection head is wiped off, the injection head retreats while making contact with the notch, and this contact causes the foamed heat insulating material to be scraped off the surface of the injection head.

According to the second aspect of the invention, when the injection head is pulled out, the layer having a small elastic coefficient has a large portion in contact with the injection head, and the foamed heat insulating material can be scraped off in a wide range on the surface of the injection head. In the invention of claim 3, the plate material having a large elastic coefficient has a large force to straighten,
It is possible to prevent the inlet seal from expanding outward due to the pressure of the foamed heat insulating material. As a result, the elastic coefficient of the injection port seal itself can be made smaller, the portion in contact with the inserted injection head can be made larger, and the foamed heat insulating material can be scraped off in a large area.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. The inlet 9 in the refrigerator 1
The position and the insertion direction of the injection head 11 are shown in FIG.
Same as. The specific CFC HCFC-142b / 22 foam insulation 3 injected in this embodiment is the refrigerator 1
It is performed by inserting a rod-shaped injection head 11 between the inner box 5 and the outer box 7. The injection port 9 into which the injection head 11 is inserted has a circular shape, and an injection port seal 13 is provided on the back side of the injection port 9, that is, inside the outer box 7. The inlet seal 13 is made of foamed polyethylene having elasticity and is bonded to the entire circumference of the inlet 9. A notch 15 for inserting the injection head 11 is formed in the center of the injection port seal 13. The notch 15 has a cross shape in this embodiment. The size of the notch 15 is such that the contact of the inlet seal 13 with the injection head 11 at the notch 15 is appropriate when the insertion is performed. That is,
If the notch 15 is too small and the contact force is too large, it may be difficult to insert the injection head 11 and the injection port may be damaged. If the cut 15 is too large and the contact force is small, a minute gap is likely to be formed between the cut 15 and the injection head 11.

The operation of this embodiment will be described below. When injecting the foamed heat insulating material 3, as shown in FIG. 8, the back surface of the refrigerator 1 faces upward, and the rod-shaped injection head 1 is inserted into the injection port 9 formed in the back surface from above as shown in FIG.
Insert 1. After the insertion, the foaming heat insulating material 3 is injected from the injection head 11, and the specific CFC HCF of this embodiment is injected.
Since the boiling point of the C-142b / 22 foamed heat insulating material 3 is 0 ° C. or less, it vaporizes at room temperature (23.5 ° C.), so that foaming rises quickly and is injected in the form of foam. Therefore, pressure is generated due to foaming with the injection head 11 inserted. However, the injection port seal 13 having elasticity is in contact with the injection head 11 from the four sides at the cross-shaped cut 15, and it is difficult to form a gap between the injection head 11 and the injection port seal 13. Therefore, it is possible to prevent the foamed heat insulating material 3 from splashing or leaking from the gap. In contrast,
In the conventional example (FIG. 9), the injection port seal 13 comes into contact with the injection head 11 only from one side, and there is no contact on the opposite side, so that a gap is unavoidably formed at the edges of the injection head 11 and the injection port 9. Occurs. The foamed heat insulating material 3 is easily splashed or leaked from this gap. Therefore, according to this embodiment, it can be said that even if the foam heat insulating material 3 having a rapid rise of foaming is used, the occurrence of leakage can be prevented.

Now, after the injection is completed, the injection head 11
When the injection head 11 is removed, the injection head 11
It retreats in the state of being contacted from all sides by 3. As a result, the foamed heat insulating material 3 attached to the surface of the injection head 11
Is scraped off by the contact of the inlet seal 13.
At this time, since the inlet seal 13 has sufficient elasticity,
This contact portion is sufficiently large that the foamed heat insulating material 3 hardly remains on the surface of the injection head 11. In this way, a sufficient cleaning effect by scraping off is obtained. Therefore, it is possible to prevent the foamed heat insulating material 3 from remaining adhered to the surface of the injection head 11 after being removed, and the injection head 1 is not removed when the next injection operation into the refrigerator 1 is performed due to the adhesion.
It is possible to prevent that 1 is difficult to insert into the injection port 9, or it is possible to prevent an accident that the foamed heat insulating material 3 attached to the injection head 11 drops and attaches to the back surface of the refrigerator 1.

A second embodiment of the present invention will be described with reference to FIGS.
Will be explained. In this embodiment, the injection port seal 13 made of expanded polyethylene is the same as that in the first embodiment. However, in this embodiment the inlet seal 1
A maltopline layer 17 is provided on the back side surface of 3, that is, the surface that is in contact with the foamed heat insulating material 3. The layer 17 of maltoprene has a smaller elastic modulus than foamed polyethylene. The cross-shaped notch 19 formed in the maltopline layer 17 is smaller than the notch 15 formed in the inlet seal 13.

From these facts, the portion of the moltopline layer 17 that is in contact with the inserted injection head 11 is larger than that of the injection port seal 13. By thus increasing the contact portion, it is possible to further prevent a gap from being formed around the inserted injection head 11. Also, when the injection head 11 is pulled out, the injection head 1
The area where the foam heat insulating material 3 is scraped off the surface of 1 can be made wider, and the foam heat insulating material 3 can be scraped off more completely.

That is, although the material itself having a small elastic coefficient such as maltoprene cannot be used as the material for the injection seal 13 because it is not stiff, it is provided in combination with the injection port seal 13 such as the foamed polyethylene 3.
As described above, excellent effects can be obtained. Also,
Since the contact portion of the maltoplane to the injection head 11 is large, it is not necessary to make the contact portion of the injection port seal 13 itself too large, and the elastic coefficient of the injection port seal 13 can be made larger, and the injection head 11 can be made stronger. It is possible to prevent the inlet seal 13 from bulging to the outside due to the pressure of the foamed heat insulating material 3 after being completely removed. The two cross-shaped cuts 15 and 19 may have the same cut direction or may be rotated by a predetermined angle to be displaced. For example, when shifted by 45 degrees, the contact between the injection seal 13 and the layer 17 of the moltopline to the injection head 11 is made from eight directions, and the gap around the injection head 11 is made smaller, and the foamed insulating material 3 attached thereto is adhered. The effect of scraping off can be increased.

Further, a small round hole may be formed in the layer 17 of the maltoprene instead of the cross-shaped notch 19. The diameter of this round hole is made sufficiently smaller than the diameter of the cylindrical injection head 11. Thereby, when the injection head 11 is inserted into the round hole of the layer 17 of the maltoprene, the diameter of this round hole is enlarged. Then, when the injection head 11 is pulled out, the round hole is reduced. In this way, the layer 17 of maltoprene can contact the entire circumference of the injection head 11. Therefore, the gap around the injection head 11 can be completely eliminated, and the foamed heat insulating material 3 can be scraped off from the entire periphery.

A third embodiment of the present invention will be described with reference to FIGS. As described above, if the elastic coefficient of the injection port seal 13 is made too small in order to increase the contact portion with the injection head 11, the injection port seal 13 will bulge outward due to the pressure of the foamed heat insulating material 3 after injection ( (Fig. 5) There is a fear. To prevent this, this third
In the embodiment, the tongue-shaped plate member 21 is provided on the back side surface of the inlet seal 13, that is, the surface on the side in contact with the foam heat insulating material 3.
The tongue-shaped plate member 21 is made of a material having a larger elastic coefficient than that of the inlet seal 13 and is provided in a cantilever state so as to close the cross-shaped cut 15 (FIG. 6). Then, for example, a resin sheet or a thin iron plate is used.

In this third embodiment, the inlet seal 1
The effect of 3 itself, that is, it is difficult to form a gap around the injection head 11 and the foamed heat insulating material 3 can be scraped off when the injection head 11 is pulled out, is the same as in the above embodiment. Further, in this embodiment, when the pressure of the foamed heat insulating material 3 is applied to the inlet seal 13 after the injection head 11 is completely removed,
It is possible to prevent the inlet seal 13 from being pushed by this pressure and expanding outward (FIG. 7).

That is, a tongue-shaped plate member 21 having a large elastic coefficient
However, since the notch 15 of the inlet seal 13 is covered, the notch 15 is reinforced so to speak, and the pressure of the foam heat insulating material 3 is first received by this plate member 21. Since the plate member 21 has a large elastic coefficient, it is difficult to bend and the received force can be dispersed and transmitted to the inlet seal 13. Therefore, in order for the pressure of the foamed heat insulating material 3 to swell the injection port seal 13 to the outside, it is necessary to have such a large pressure as to bend not only the plate material 21 but also the injection port seal 13 to the outside. Therefore, the injection port seal 13 does not bulge outward, the finished state is good, and the appearance is improved.

[0019]

As described above, according to the first aspect of the present invention, the injection head inserted into the notch of the inlet seal is contacted from both sides of the notch. Unlike the injection port seal, the contact is not on only one side, and it is difficult to form a gap around the injection head. Therefore, the foam heat insulating material does not splash or leak from the gap, and it is possible to prevent the foam heat insulating material from adhering to the outside of the inlet of the refrigerator as a product. Also, when the injection head is removed after the injection is completed, the injection port seals contacting from both sides of the injection head scrape off the foam seal from the injection head, leaving the foam insulation attached to the injection head. Can be prevented. According to the invention of claim 2, since the layer having a small elastic coefficient can contact the injection head at a larger contact portion, the foamed heat insulating material on the surface of the injection head can be scraped off more effectively, and the injection head can be removed. It is possible to prevent the foamed heat insulating material from remaining attached.

According to the third aspect of the present invention, the tongue-shaped seal having a large elastic coefficient is used even if the elastic coefficient of the inlet seal is reduced in order to increase the portion of the inlet seal that contacts the injection head in the cut. The plate material reinforces the inlet, so to speak, keeps the inlet straight even against the pressure of the foamed heat insulating material, and prevents it from expanding outward as in the conventional case.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing the inlet seal of FIG.

FIG. 3 is a sectional view showing a second embodiment of the present invention.

FIG. 4A is an enlarged perspective view showing the inlet seal of FIG. (B) is a plan view of (A). (C) is a side view of (A). (D) is a rear view of (A).

5 is a sectional view illustrating a problem that may occur in the embodiment of FIG.

6 is a third embodiment of the present invention for solving the problem of FIG.
It is sectional drawing which shows an Example.

FIG. 7 is a diagram showing a state after the work of injecting the foam insulation material of FIG. 6;

FIG. 8 is a perspective view of the entire refrigerator showing the work of injecting the foam insulation material.

9 is a cross-sectional view of a conventional example showing a main part of FIG.

FIG. 10 is a diagram illustrating a problem of FIG.

[Explanation of symbols]

1 Refrigerator 3 Foam Insulation 5 Inner Box 7 Outer Box 9 Injection Port 11 Injection Head 13 Injection Port Seal 15, 19 Notch 17 Moltoprene Layer 21 Tongue-shaped Plate

Front page continuation (72) Inventor Hajimoto Hajime 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Minoru Kurihara 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Etsuo Fukushima 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Inventor Takayuki Fujio 2-5 Keihan Hondori, Moriguchi City, Osaka Prefecture No. 5 Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. An injection port for injecting a foamed heat insulating material is formed between an inner box and an outer box constituting a refrigerator, and an elastic injection port seal for closing the injection port is provided all around the injection port. A refrigerator provided with an adhesive and having a notch for inserting an injection head for performing the injection in the center of the injection port seal. 2. The refrigerator according to claim 1, wherein a layer made of a material having a smaller elastic coefficient than that of the inlet seal is provided on a surface of the inlet seal which is in contact with the foamed heat insulating material. 3. A tongue-shaped plate material having a larger elastic coefficient than that of the inlet seal is provided on the surface of the inlet seal on the side in contact with the foamed heat insulating material.
The refrigerator according to claim 1, which is provided in a cantilever state so as to close the cut.