RU2433361C2 - Household appliance housing and pressure equalisation valve therefor - Google Patents

Abstract

FIELD: machine building. ^ SUBSTANCE: proposed housing with layer of isolation material arranged between rigid outer jacket and inner lining has pressure equalisation valve arranged in tube. Said tube passes through insulation material layer tightly adjoins outer jacket and inner lining. Tube comprises two telescoping sleeves, one being tightly secured to outer jacket and another one secured to inner lining. Note here that outer sleeve envelopes inner sleeve with clearance there between on at least a portion of outer sleeve length, while ring-like collar envelopes inner sleeve at said section to adjoin outer sleeve. Pressure equalisation valve for refrigerator incorporates aforesaid sleeved that form passage that may be shut off. Outer sleeve envelopes inner sleeve with clearance there between on at least a portion of outer sleeve length, while ring-like collar envelopes inner sleeve at said section to adjoin outer sleeve. Outer sleeve has tapered inlet section wherein inner sleeve telescopes. ^ EFFECT: ease of mounting of pressure equalisation valve. ^ 10 cl

Description

Technical field

This invention relates to a housing of a household appliance, in particular a refrigerating apparatus, and to a pressure equalization valve used in such a housing.

State of the art

Each time the refrigerator door is opened, warm air enters it, which, after closing the door, cools there and creates a vacuum. The sparseness leads to the fact that the door is difficult to open again until the pressure between the inner space and the environment is again equalized. In order to easily open the door each time, it was proposed to install a pressure equalization valve in the wall of the casing of such an apparatus, which, in the presence of rarefaction in the internal space, lets air in from the outside in and closes as soon as the pressure between the environment and the internal space is equalized, so uncontrolled heat and humidity entering the interior are eliminated.

In currently common refrigeration units, where the space between the rigid outer skin and the rigid inner skin is filled with expandable synthetic insulating material, the installation of such a pressure equalization valve is costly. To install the valve before filling the cavity with foam, it is necessary to cut openings in the outer and inner linings in which the valve is placed, and it is also necessary to ensure that the valve is firmly adjacent to the inner and outer linings to prevent foam from protruding when filling the space with foam. If you install the valve after filling the space with foam, it is also necessary to cut holes in the outer and inner casing after filling the space with foam, which is difficult to do without damaging the layer of insulating foam.

Everything is further complicated by the fact that the dimensions of the valve must correspond to the thickness of the walls into which it is placed. Therefore, for models of devices with different wall thicknesses, different valve designs are required, and deviations in the wall thickness that can occur during production, for example, as a result of various conditions when filling the space with foam, also complicate the subsequent installation of the valve.

Disclosure of invention

The objective of the invention is, firstly, the development of a housing for a household appliance with a pressure balancing valve that can be installed simply and without high costs.

This problem according to the invention is solved by a housing with a layer of insulating material enclosed between the rigid outer skin and the rigid inner skin, and with a pressure equalization valve placed in the tube, which passes through the layer of insulating material and is adjacent to the outer and inner sheaths, and the tube includes there are two bushings entering one another, one of which is tightly attached to the outer skin, and the other to the inner skin. The bushings, one in the other, due to the possibility of their extension along the length, can adapt to different, or changing, wall thicknesses of the case. Each of the bushings is tightly attached to the outer and inner skins, even if the distance between them varies.

The outer of the two bushings preferably has a conically-expanding inlet portion protruding into the layer of insulating material. This inlet section simplifies valve mounting, making bushings easier to fit into each other. This is especially important when assembling the wall into which the valve is placed. If the bushings are first attached to the outer and inner wall cladding, then their ends facing each other should be inserted into each other before connecting the outer and inner cladding to each other. This alignment is simplified thanks to the extended section.

If the outer of the two bushings covers at least one portion of its length an inner sleeve with a clearance, then to seal the bushings between themselves, the inner sleeve in this section preferably surrounds the first ring-shaped cuff adjacent to the outer sleeve.

This cuff preferably has a concave shape on the side of the layer of insulating material, so that under the pressure of the expanding insulating material it is pressed against the outer sleeve, which contributes to the snug fit of the cuff to the outer sleeve.

The bushings are fixed on the inner or outer sheathing due to the fact that the sleeve passing through the corresponding hole has protrusions adjacent to the outer or inner sheathing on their outer side and a second annular cuff adjacent to the outer or inner sheathing on their inner side, on the side layer of insulating material. Thus, the outer or inner sheathing is clamped between the protrusion and the sleeve envelope of the sleeve, and the sleeve simultaneously prevents the insulating material from accessing the edges of the hole and protruding outward.

The valve preferably includes a curved flexible sheet included in the inner sleeve with edges adjacent to the inner side of the sleeve.

To hold the sheet in the sleeve, it is provided that a strip extends along the inner sleeve along its diameter, and the sheet fits onto the strip. In addition, to hold the sheet, a cap piece is fixed at one end of the sleeve, which limits the free sectional area of the sleeve so that the sheet does not slip.

In addition, the object of the invention is to provide a pressure equalization valve that is easily and reliably tightly installed in the wall of the apparatus body and allows to compensate for wall thickness deviations.

This problem is solved by means of a pressure equalization valve with two bushings entering one another, forming a closed passage, the outer sleeve covering at least one section of its length enclosing the inner one with a gap, and the first ring-shaped cuff surrounding the outer one sleeve, as well as a pressure equalization valve with two bushings entering one another, forming a closed passage, and the outer sleeve has a conically expanding inlet section into which The inner sleeve is inserted.

Brief commentary on the drawings

Further features and advantages of the invention follow from the following description of embodiments with reference to the accompanying figures. They show the following:

figure 1 - view of the refrigeration apparatus according to the invention;

figure 2 - used in the refrigerating apparatus of figure 1, the pressure equalization valve, partially in section and partially in axonometric image; and

figure 3 is an enlarged fragment of figure 1.

The implementation of the invention

Figure 1 shows the housing of the refrigeration unit with the actual housing 1 and the door 2, hung on the housing 1, shown here in a half-open position. The door 2 on its reverse side, hidden from the observer, has a magnetic seal not shown here, which in the closed position is sufficiently tightly adjacent to the front side 3 of the housing, so that when the air in the interior 4 of the apparatus is cooled, a reduced pressure arises in it door 2 with great force to the front side 3, if no measures are taken to equalize the pressure between the inner space 4 and the environment.

To perform such pressure equalization, a pressure equalization valve 5 is provided. In the design of FIG. 1, a pressure equalization valve 5 passes through door 2; it can be located on another wall of the housing 1.

In Fig.2, the pressure equalization valve 5 and its surroundings are shown partially in section, partially in a perspective view. Part of the metal outer door trim is indicated by the number 6. The inner skin is formed by a plastic shell formed by deep drawing, tightly connected at the edges (not shown) with the outer skin. A fragment of the inner chamber is indicated by the number 7.

In the bottom of the recess 8 formed in the inner chamber, an opening 9 is cut out having the shape of a circle reduced by two segments from opposite sides. Before connecting the inner chamber 7 with the outer casing 6, the first sleeve 10 is inserted into the hole 9 from the side hidden from the observer and fixed there. At the end facing the observer, the sleeve 10 is provided with a flange 11, which, like the hole 9, has the shape of a circle with truncated side segments and therefore, in a position rotated 90 ° relative to the image, passes through the hole 9 and is fixed in it in the shown position .

The wall of the inner chamber 7 in the shown configuration is clamped between the flange 11 and the annular flange 12, elastically pressing the inner chamber 7 from the side of the outer skin. The outer diameter of the annular flange 12 exceeds the diameter of the hole 9, so that the insulation material not shown in FIG. 2, filling the space between the outer skin 6 and the inner chamber 7, does not enter the hole 9.

A second ring-shaped flange 13 of a diameter smaller than the first ring-shaped flange 12 is formed on the sleeve 10 closer to its end from the side of the outer skin 6. This ring-shaped flange 13 is elastically adjacent to the inner side of the conically expanding portion 14 of the second sleeve 15. The sleeve 15 is attached in the same manner as the sleeve 10, to the outer skin 6, clamping the latter between the flange 16 adjacent to the skin 6 from the outside, and an elastic annular flange 17 adjacent to the inside. The elasticity of the annular flange 13 allows you to shift two bushings 10, 15 relative to each other during assembly, thereby compensating for the variable thickness of the door.

The sleeve 15 is also attached to the outer skin 6 before it is connected to the inner chamber 7. When the outer skin 6 is connected to the inner chamber 7, the expanding section 14 facilitates the penetration of the sleeve 10 into the sleeve 15.

Adjacent to section 14 is a short cylindrical segment 18 of sleeve 15, in which sleeve 10 is held with a geometric closure.

The free end of the sleeve 10 reaches the cup-shaped expansion 19 of the sleeve 15, which is adjacent to the cylindrical section 18 and contains a flange 16 and an annular flange 17.

As a result of advancing into the conical portion 14, the annular flange 13 of the sleeve 10 is elastically bent so that the surface of the annular flange 13 from the side of the insulating material becomes concave. Thus, when pressure arises when filling the space between the outer skin 6 and the inner chamber 7, the annular flange 13 is pressed against the conical portion 14, which improves the sealing effect of the annular flange 13.

The inner volume of the sleeve 10 is divided by the diameter of the longitudinal partition 20. On the longitudinal partition 20 is put on an elastic sheet 21 of plastic. The sheet 21 has a substantially elliptical shape, so that its edges along the entire length fit snugly against the sleeve 10. In the case of reduced pressure in the inner space 4, the edges of the sheet 21 are pushed in the direction of the longitudinal partition 20, and air flows from the outside to the inside. In the case of increased pressure in the inner space 4, it acts on the entire surface of the sheet 21 and presses it outward, or to the sleeve 10. The sleeve piece 22, mounted on the free end of the sleeve 10 with a bayonet lock not shown, prevents the sheet 21 from being pulled out of the sleeve 10 under the action of increased internal pressure, firstly, because the cap piece 22 narrows the free opening of the sleeve 10, and secondly due to the transverse jumper 23, which extends in diameter through the central hole 24 of the cap piece 22.

In the view of the valve shown in FIG. 2, the extension 19 of the sleeve 15 with the flange 16 adjacent to the outside of the outer skin 6 is shown, the part of the hole of the outer skin 25 into which the sleeve 15 is inserted, as well as the cap piece 22 inside the extension 19.

Claims (10)

1. Housing of a household appliance with a layer of insulating material enclosed between the rigid outer skin (6) and the rigid inner skin (7), and with a pressure equalization valve (5) placed in the tube that passes through the layer of insulating material and is adjacent to the outer and inner casing, characterized in that the tube includes two bushings (10, 15) entering one another, one of which is tightly attached to the outer casing (6), and the other to the inner casing (7), and the outer (15 ) of two bushings (10, 15) on at least one section (14) of its length covers the inner sleeve (10) with a gap, and that the inner sleeve (10) in this section bends around the first annular cuff (13) adjacent to the outer sleeve (15). 2. The housing according to claim 1, characterized in that the outer (15) of the two bushings (10, 15) has a conically expanding inlet section (14) protruding into the layer of insulating material into which the inner sleeve (10) is inserted. 3. The housing according to claim 1, characterized in that on the side that faces the layer of insulating material, the cuff (13) has a concave shape. 4. The housing according to one of claims 1 to 3, characterized in that at least one of the bushings (15, 10) passes through the hole (25, 9) in the outer skin (6) or in the inner skin (7) on which this sleeve (15, 10) is fixed, and that the sleeve (15, 10) has protrusions (16, 11) adjacent to this outer skin (6) or inner skin (7) on their outer side, and the second ring-shaped a cuff (17, 12) adjacent to the outer skin (6) or the inner skin (7) on their inner side facing the layer of insulating material. 5. The housing according to one of claims 1 to 3, characterized in that the valve (5) includes a curved flexible sheet (21) included in the inner sleeve (10) with edges adjacent to the inner side of the sleeve (10). 6. The housing according to claim 5, characterized in that the strip (20) passes through the inner sleeve (10) along its diameter and that the sheet (21) fits onto the strip. 7. The housing according to claim 5, characterized in that the sheet (21) is held in the inner sleeve (10) by means of a cap piece (22) fixed at one end of the sleeve (10), which limits the free cross-sectional area of the sleeve (10). 8. The pressure equalization valve for the refrigeration apparatus with two bushings (15, 10) entering one another, forming a closed passage, the outer (15) of two bushings (10, 15), in at least one section (14) of it the length covers the inner sleeve (10) with a gap and that the inner sleeve (10) in this section (14) is enveloped by the first annular cuff (13) adjacent to the outer sleeve (15). 9. The pressure equalization valve according to claim 8, characterized in that the cuff (13) has a concave shape from the side facing outward. 10. The pressure equalization valve for the refrigeration apparatus with two bushings (15, 10) entering one another, forming a closed passage, the outer (15) of two bushings (10, 15) having a conically expanding inlet section (14) into which inner sleeve (10).

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