WO2011036870A1

WO2011036870A1 - Refrigerator

Info

Publication number: WO2011036870A1
Application number: PCT/JP2010/005728
Authority: WO
Inventors: 克則堀井; 好正堀尾; 愼一堀井; 正昭田中; 雅司湯浅
Original assignee: パナソニック株式会社
Priority date: 2009-09-24
Filing date: 2010-09-22
Publication date: 2011-03-31
Also published as: BR112012006383A2; BR112012006383B1; CN102510986B; CN102510986A

Abstract

A refrigerator is provided with a heat insulation box, a heat insulation door which opens and closes the front face of the opening of the heat insulation box, a storage compartment which is provided with the heat insulation box and the heat insulation door, a heat insulation partition wall which partitions the storage compartment into compartments, and a machine compartment which contains a compressor and is provided below the heat insulation box. The thickness of the heat insulation partition wall is set to be greater than the thickness of the heat insulation wall provided between the storage compartment and the machine compartment, and this provides an overall reduction in the entry of heat through the heat insulation wall and in the entry of heat from the opening. As a result, the cooling efficiency is improved to reduce the consumption of electricity by the refrigerator.

Description

refrigerator

The present invention relates to a refrigerator with high energy saving effect.

It is well known that the power consumption of refrigerators occupies the top rank among electric devices in general households. This is because the refrigerator is normally energized continuously for 24 hours unlike other electric devices. Therefore, in order to save power (energy saving) in ordinary households, it is required to save power in the refrigerator.

One of the factors that greatly consumes power in the refrigerator is that the temperature inside the cabinet rises due to the intrusion of heat from the outside air through the heat insulating wall of the cabinet (hereinafter referred to as intrusion heat), and the compressor is operated for a long time. It is conceivable to drive at a high frequency. Therefore, the higher the heat insulation performance of the cabinet, the smaller the intrusion heat from the outside air, so that the temperature rise in the cabinet can be suppressed, the compressor operation time can be shortened, or the compressor can be driven at a low frequency. Can be achieved.

Generally, a cabinet has a structure in which a heat insulating material such as urethane foam is foam-filled between an inner box and an outer box. It is well known that the heat insulating performance increases as the thickness of the heat insulating material (heat insulating wall thickness) simply increases, and the heat insulating wall thickness is increased in order to reduce intrusion heat. In particular, the greater the difference between the temperature around the cabinet and the temperature in the storage room, the greater the heat insulation wall thickness, the greater the effect of reducing intrusion heat, and the power can be saved.

On the other hand, since the size of the kitchen itself and the size of kitchen equipment in ordinary houses are standardized to some extent, the size of the installation space for installing the refrigerator is also limited to some extent.

Furthermore, the storage capacity of general household refrigerators tends to increase due to an increase in refrigerated / frozen foods due to recent food changes and an increase in working housewives.

Therefore, to simply save power, increasing the insulation wall thickness is against the customer's needs, and does not increase the external dimensions of the refrigerator. It is necessary.

FIG. 13 is a longitudinal sectional view of a basic structure of a storage room adjacent to a machine room of a conventional refrigerator. Insulating doors are omitted.

As shown in FIG. 13, the heat insulating box 2 is partitioned into a plurality of storage rooms by the heat insulating partition wall 1, and a storage case 3 for storing food is provided in each storage room.

In addition, a machine room 5 for arranging devices such as the compressor 4 is configured on the back surface of the lower part of the heat insulation box 2, and the compressor 4 and the like generate heat during operation. It becomes hotter than other parts outside the body 2. Therefore, the heat insulation wall thickness 6 of the heat insulation wall thickness 6 covering the machine room 5 where the temperature difference from the storage room becomes large is set to be the largest. On the other hand, since the temperature difference between the adjacent storage chambers becomes smaller than the temperature difference from the outside of the heat insulation box 2, the heat insulation wall thickness of the heat insulation partition wall 1 is set to be the smallest.

In general, as described above, on the premise of maintaining the external dimensions and storage volume of the refrigerator, the heat insulation wall thickness of the heat insulation box is distributed by the temperature difference between the outside and the storage room, and the intrusion heat is efficiently reduced. Thus, power saving is achieved (see, for example, Patent Document 1).

However, in general, cold air is exposed between the front opening formed by the heat insulating partition wall that insulates between adjacent storage chambers, the side heat insulating wall and the bottom heat insulating wall of the storage chamber, and the heat insulating door. A door gasket is provided to prevent leakage. Since the metal receiving member for tightly attaching the door gasket crosses the outside of the storage chamber on the front surface of the heat insulating partition wall forming these openings, the heat of the outside air is stored by the heat conduction of the metal receiving member. Enter the room directly. Therefore, if the wall thickness of the heat insulating partition wall is small, the heat transfer coefficient between the metal receiving member and the cold air increases because the main flow of the cold air circulating in the storage chamber reaches the vicinity of the high temperature metal receiving member. Heat increases and consumes a lot of power.

Therefore, on the premise of maintaining the external dimensions and storage volume of the refrigerator, not only the heat intrusion through the heat insulating wall, that is, not only the temperature difference from the outside air, but also the intrusion heat from the opening is considered and comprehensively saved. It is necessary to distribute the insulation wall thickness so that power can be achieved.

JP 2006-200774 A

The refrigerator of the present invention includes a heat insulation box, a heat insulation door that opens and closes the front surface of the opening of the heat insulation box, a storage room having a heat insulation box and a heat insulation door, and a heat insulation partition that partitions the storage room into a plurality of storage rooms. A wall and a machine room provided at a lower portion of the heat insulating box for storing the compressor; And the wall thickness of a heat insulation partition wall is made larger than the wall thickness of the heat insulation wall provided between the store room and the machine room. Thus, on the premise of maintaining the external dimensions and the storage volume of the refrigerator, the intrusion heat from the outside air is reduced, the cooling efficiency is improved, and the power-saving refrigerator is provided.

FIG. 1 is a longitudinal sectional view of the refrigerator according to Embodiment 1 of the present invention. FIG. 2 is a vertical cross-sectional view of the basic structure of the storage room adjacent to the machine room of the refrigerator according to Embodiment 1 of the present invention. FIG. 3 is an enlarged cross-sectional view of the upper part of the heat insulating door of the storage room adjacent to the machine room of the refrigerator according to Embodiment 1 of the present invention. FIG. 4 is a diagram showing the relationship between the general amount of intrusion heat and the heat insulation wall thickness. FIG. 5 is a diagram showing the relationship between the amount of heat entering the storage room of the refrigerator and the heat insulation wall thickness ratio according to Embodiment 1 of the present invention. FIG. 6 is an enlarged cross-sectional view of the upper part of the heat insulation door of the storage room adjacent to the machine room of the refrigerator in the second embodiment of the present invention. FIG. 7 is a longitudinal cross-sectional view of the basic structure of a storage room adjacent to the machine room of the refrigerator in Embodiment 3 of the present invention. FIG. 8 is an enlarged cross-sectional view of the lower part of the heat insulation door of the storage room adjacent to the machine room of the refrigerator according to Embodiment 3 of the present invention. FIG. 9 is a diagram showing the relationship between the amount of heat entering the storage room of the refrigerator and the heat insulation wall thickness ratio according to Embodiment 3 of the present invention. FIG. 10 is a plan sectional view of a basic structure of a storage room adjacent to the machine room of the refrigerator according to Embodiment 4 of the present invention. FIG. 11 is an enlarged cross-sectional view of a heat insulating door side part of a storage room adjacent to the machine room of the refrigerator according to Embodiment 4 of the present invention. FIG. 12 is a diagram showing the relationship between the amount of heat entering the storage room of the refrigerator and the heat insulation wall thickness ratio according to Embodiment 4 of the present invention. FIG. 13 is a longitudinal sectional view of a basic structure of a storage room adjacent to a machine room of a conventional refrigerator.

Hereinafter, the present embodiment will be described with reference to the drawings, but the same reference numerals are given to the same configurations as those of the conventional example or the previously described embodiment, and the detailed description thereof will be omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of the refrigerator according to Embodiment 1 of the present invention.

As shown in FIG. 1, the refrigerator 100 is a machine that houses a heat insulating box body 101,

heat insulating doors

117, 118, 119,

storage chambers

104, 105, 106, heat

insulating partition walls

120, 121, and a compressor 108. Chamber 107.

The heat insulating box 101 is provided with an outer box 102 mainly using a steel plate and an inner box 103 molded with a resin such as ABS. And the inside of the heat insulation box 101 is filled with foam heat insulating materials, such as hard foaming urethane, for example, and is thermally insulated with the circumference | surroundings. Further, the plurality of

storage chambers

104, 105, 106 are partitioned by heat insulating

partition walls

120, 121. The front opening of each storage chamber is closed by

heat insulating doors

117, 118, and 119 that are rotatably supported by the refrigerator body. For example, assuming that the

storage rooms

104, 105, and 106 are a refrigerated room, a vegetable room, and a freezer room, respectively, the temperature at which the refrigerated room 104 does not freeze for refrigerated storage is normally set to 1 ° C. to 5 ° C. The vegetable room 105 has a temperature setting of 2 ° C. to 7 ° C., which is the same as or slightly higher than that of the refrigerator room. The freezer compartment 106 is set in a freezing temperature zone and is usually set at −22 ° C. to −15 ° C. for frozen storage, but for example, −30 ° C. or −25 ° C. to improve the frozen storage state. It may be set at a low temperature. The machine room 107 is formed in the back area of the lowermost storage room 106 of the heat insulation box 101 and houses components constituting the refrigeration cycle such as the compressor 108 and a dryer (not shown) for removing moisture. To do.

FIG. 2 is a longitudinal sectional view of a basic structure of a storage room adjacent to the machine room of the refrigerator according to Embodiment 1 of the present invention.

As shown in FIG. 2, a cooling chamber 109 that generates cold air is provided on the back surface of the storage chamber 106. A back partition wall 110 is formed between the storage chamber 106 and the cooling chamber 109. The rear partition wall 110 has heat insulation properties, and insulates the storage chamber 106 and the cooling chamber 109. A cooler 111 is disposed in the cooling chamber 109. In the space above the cooler 111, a cooling fan 112 is provided for blowing the cool air cooled by the cooler 111 by the forced convection method, for example, to the

storage chambers

104, 105, and 106 shown in FIG. . The space below the cooler 111 is provided with a radiant heater 113 made of glass tube for defrosting the frost and ice adhering to the cooler 111 and its periphery during cooling. A drain pan 114 for receiving defrost water generated at the time of defrosting and draining it outside the warehouse is formed in the through passage 115 at the lower part of the radiant heater 113, and an evaporating dish 116 is provided outside the warehouse on the downstream side of the through passage 115. It is configured.

The rear partition wall 110 is provided with a cold air outlet 124 and a cold air inlet 125. The cool air generated by the cooler 111 is supplied from the cool air discharge port 124 to the storage chamber 106 by the cooling fan 112. The cold air inlet 125 is provided below the cold air outlet 124, and the cold air circulated in the storage chamber 106 is returned to the cooler 111 from the cold air inlet 125.

In addition, a storage case is provided in the storage chamber 106. The storage case is held and pulled out by a drawer mechanism such as a rail, and stores foods. In the present embodiment, three storage cases are provided in the storage chamber 106. Specifically, the upper storage case 126, the middle storage case 127, and the lower storage case 128.

The dimension a is the dimension of the wall thickness of the heat insulating wall provided between the storage chamber 106 and the machine chamber 107. The dimension a is the dimension of the largest portion of the heat insulating wall that covers the machine room 107. The dimension a is the dimension of the wall thickness of the heat insulating wall where the storage chamber 106 and the machine chamber 107 face each other in the front-rear direction. The dimension a is the dimension of the wall thickness of the heat insulating wall that does not have the through passage 115 in the heat insulating wall covering the storage chamber 106 and the machine room 107. The dimension a is the dimension of the wall thickness of the heat insulating wall where the storage chamber 106 and the machine chamber 107 face each other. The dimension b is the dimension of the wall thickness of the heat insulating partition wall 121. A detailed description of the dimension b will be given with reference to FIG.

FIG. 3 is an enlarged cross-sectional view of the upper part of the heat insulation door of the storage room adjacent to the refrigerator machine room in Embodiment 1 of the present invention.

As shown in FIG. 3, a door gasket 122 is provided on the inner edge of the heat insulating door 119 over the entire circumference (the same applies to the storage chamber 104 and the storage chamber 105). A U-shaped metal receiving member 123 is provided on the front surface of the heat insulating partition wall 121 whose outer periphery is formed of a resin portion so as to extend inside and outside the storage chamber 106, and the metal receiving member 123 is in close contact with the door gasket 122. This prevents the cold air from leaking outside. The metal receiving member 123 is a U-shaped (Greek-shaped saddle shape) having a horizontal portion and a vertical portion, so that the horizontal portion is appropriately supported by the front portion of the heat insulating material 121 and the vertical portion is the door gasket 122. To maintain a close contact state. Thereby, the heat intrusion to the storage chamber 105 or the storage chamber 106 is suppressed.

Moreover, heat penetration can be further suppressed by providing a heat exchange suppressing portion between the metal receiving member 123 and the storage chamber 106.

Specifically, the heat insulating member 130 is provided directly below the metal receiving member 123. The horizontal portion of the metal receiving member 123 is positioned above the heat insulating member 130 and is sandwiched between the front surface portion of the heat insulating partition wall 121 and the heat insulating material 130. Thereby, the heat dissipation from the horizontal part of the metal receiving member 123 can be suppressed appropriately. The heat insulating member 130 is held by a resin portion that forms the outer periphery of the heat insulating partition wall 121.

Furthermore, the metal receiving member 123 is provided with a heat radiating pipe 131 as a heating unit so as to be in close contact with the side surface of the metal receiving member 123 in order to prevent condensation on the outer side surface of the storage chamber 106. The heat radiating pipe 131 uses a high-temperature refrigerant pipe in a refrigeration cycle (not shown), and the metal receiving member 123 is heated by the heat.

Next, the b dimension will be described. As described above with reference to FIG. 2, the dimension b is the dimension of the wall thickness of the heat insulating partition wall 121. The b1 dimension is a height dimension including the metal receiving member 123 and the holding part of the metal receiving member 123, and the b2 dimension is a height dimension including the heat insulating member 130 and the holding part. The b1 dimension is fixed.

In the present embodiment, for example, the b dimension (= b1 + b2) is made larger than the a dimension shown in FIG. Specifically, in the present embodiment, the dimension a which is the wall thickness of the heat insulating wall between the storage chamber 106 and the machine room 107 is 60 mm, and the dimension b which is the wall thickness of the heat insulating partition wall 121 is 70 mm (the dimension b1 is 49 mm, b2 dimension is 21 mm).

Here, the positional relationship between the door gasket 122 and the heat insulating member 130 will be described in detail. Specifically, the door gasket 122 is disposed above the lower surface of the heat insulating member 130 (C position in FIG. 3). Thereby, the cold air in the freezer compartment 106 is less likely to flow in the direction of the door gasket 122, the flow of cold air to the door gasket 122, which is a member that crosses the inside and outside of the warehouse, can be reduced, and heat exchange is further suppressed. it can.

Furthermore, heat exchange between the metal receiving member 123 and cold air cools the metal receiving member 123, and prevents condensation on the surface of the metal receiving member 123 in contact with the outside due to a rapid temperature difference between inside and outside. it can.

Next, the positional relationship between the metal receiving member 123 and the heat insulating member 130 will be described.

The metal receiving member 123 heated by the heat radiating pipe 131 has a lower flange 123a. Specifically, the lower flange 123a only needs to be covered with the heat insulating member 130, and the length between the length of the lower flange 123a (dimension A in FIG. 3) and the lateral length of the heat insulating member 130 (dimension B). The relationship is A <B. Thereby, the lower flange 123a which becomes high temperature is covered with the heat insulating member 130, the temperature rise of the surface in contact with the cold air can be prevented, and heat exchange can be suppressed. With the above configuration, it is possible to suppress the warming of the cold air, improve the cooling efficiency, and as a result, reduce the power consumption.

The operation and action of the refrigerator configured as described above will be described below with reference to FIG.

First, the flow of cold air in the storage chamber 106 will be described. The cool air cooled by the cooler 111 is forcibly blown from the discharge port 124 to the upper, middle, and lower stages in the storage chamber 106 as indicated by arrows A by the cooling fan 112 that rotates as the motor rotates. The blown-out cool air blows on the

storage cases

126, 127, and 128 to cool the food stored.

Next, as shown by arrow B, the cold air that has cooled the food is stored between the storage case 126 and the heat insulating partition wall 121 in the upper stage, between the storage case 126 and the storage case 127 in the middle stage, and stored in the storage case 127 in the lower stage. Each case 128 passes through. The cool air that has come out of each

storage case

126, 127, 128 joins between each

storage case

126, 127, 128 and the inner wall surface in the storage chamber 106. The merged cold air passes through the gap between the storage case 128 and the bottom wall of the inner box 103 as indicated by the arrow C, and is sucked from the suction port 125 as indicated by the arrow D, and returns to the cooler 111. At this time, the surface of the compressor 108 becomes hot due to heat conduction from the refrigerant that is increased in pressure and heat becomes high, motor loss, mechanical loss, etc., and as a result, the temperature of the machine room 107 is an average compared to the ambient outside air. Increases by about 10 ° C.

As described above, when the cold air circulates in the storage chamber 106, it is heated by exchanging heat with the surface of the storage chamber. Therefore, power can be saved by reducing the intrusion heat and preventing the temperature rise on the surface of the storage chamber.

Next, I will describe the intrusion heat.

Generally, intrusion heat Q (W) is expressed by the following equation.

Q = K * A * ΔT
K = 1 / (1 / αo + L / λ + 1 / αi)
Here, K is the heat transfer rate (W / m ² K), A is the heat transfer area (m ² ), ΔT is the temperature difference (K) outside the storage chamber, and αo is the convective heat transfer rate (W / m) outside the storage chamber. ² K), αi is the convective heat transfer coefficient (W / m ² K) in the storage chamber, L is the heat insulation distance (m), and λ is the heat conductivity (W / mK) of the heat insulation part. As can be seen from this equation, it is understood that the intrusion heat Q can be reduced by increasing the heat insulation distance L.

Particularly, the heat that enters from the opening is due to the outside air entering the storage chamber 106 due to the heat conduction of the metal receiving member 123. However, since the temperature of the metal receiving member 123 reaches almost the same as that of the outside air up to the part extending into the storage chamber 106, it can be seen that the contribution of the heat insulation distance L, that is, the dimension b2 in FIG. Is ignored). It can be seen that there is a large amount of intrusion heat when there is no heat insulating member 130 and the b2 dimension is only the thickness of the resin component constituting the outer periphery of the heat insulating partition wall 121 as in the prior art.

Next, the relationship between the intrusion heat quantity and the heat insulation wall thickness will be described below.

FIG. 4 is a diagram showing the relationship between a general amount of intrusion heat and a heat insulation wall thickness. FIG. 5 is a relationship diagram between the amount of heat entering the refrigerator storage room and the heat insulation wall thickness ratio (value obtained by dividing the b dimension by the a dimension) according to Embodiment 1 of the present invention. The region I indicates a region where a dimension <b dimension.

As shown in FIG. 5, when the b dimension (b2 dimension) is increased, that is, when the heat insulation wall thickness (m) of the heat insulation partition wall 121 is increased, the intrusion heat quantity (W) decreases, but it is a certain value. It has increased again from the bottom point. This is based on the premise that the external dimensions and storage volume of the refrigerator are appropriately maintained when the volume efficiency indicating the volume ratio of the storage space to the external shape is 30% to 70%. This is because when the thickness is increased, the thickness of the other heat insulating wall is decreased. That is, as shown in FIG. 4, when the heat insulation wall thickness ratio exceeds a certain value, the intrusion heat ΔQ2 from the opening that can be reduced by increasing the b2 dimension and the penetration through the heat insulating wall that increases by decreasing the a dimension. This is because the relationship with the heat quantity ΔQ1 is ΔQ1> ΔQ2. From the above, there is a heat insulation wall thickness ratio that minimizes the amount of intrusion heat under the preconditions of maintaining the external dimensions and storage volume of the refrigerator. At that time, a dimension <b dimension is established.

Therefore, as in this embodiment, by increasing the dimension b, which is the wall thickness of the heat insulating partition wall 121, from the dimension a, which is the wall thickness of the heat insulating wall provided between the storage chamber 106 and the machine room 107, It is possible to comprehensively reduce the intrusion heat through the heat insulating wall and the intrusion heat from the opening.

Also, since the intrusion heat can be reduced to prevent the temperature rise in the surface of the storage room, the cool air circulates at a low temperature. As a result, the temperature distribution in the entire storage chamber 106 can be kept uniform.

Further, the wall thickness of the heat insulating partition wall 121 is not necessarily constant with respect to the depth direction of the storage chamber 106. In other words, the same effect can be obtained even when the wall thickness of the heat insulating partition wall 121 is made thicker than the dimension a only in the vicinity of the metal receiving member 123 in the vicinity of the opening, and the other parts are made thinner.

In addition, the dimension of the heat insulation wall thickness shown by this Embodiment is an example, and this invention is not restricted to this dimension.

(Embodiment 2)
FIG. 6 is an enlarged cross-sectional view of the upper part of the heat insulation door of the storage room adjacent to the machine room showing the configuration of the refrigerator in the second embodiment of the present invention. 6 differs from Embodiment 1 in that a convex portion 150 is provided on the surface of the partition wall 122 in contact with the storage chamber 106, and the convex portion 150 and the upper storage case 126 are brought into contact with each other. It is a point.

For example, when the cold air blown into the freezing chamber 106 from the discharge port 124 shown in FIG. 2 circulates, the wall surface of the partition wall 122 that contacts the freezing chamber 106 is made convex 150 and brought into contact with the storage case 126. The flow of cold air toward the metal receiving member 123 heated by the heat radiating pipe 131 is shielded. As a result, heat exchange between the metal receiving member 123 and the cold air can be suppressed without increasing the cost due to the addition of parts and without increasing the number of assembly steps, thereby improving the cooling efficiency and consequently reducing the power consumption. can do.

Further, for example, due to deformation of the storage case 126 due to use over time, the contact of the partition wall 122 with the convex shape 150 of the wall surface in contact with the freezer compartment 106 may be eliminated, and cold air may leak to the metal receiving member 123 side. Even in such a case, by providing the heat insulating member 130 directly below the metal receiving member 123, the heat transfer from the heat radiating pipe 131 to the surface in contact with the cold air is reduced, and the temperature rise of the surface in contact with the cold air is prevented. Suppresses heat exchange.

Moreover, since the cold air circulates at a low temperature by suppressing the warming of the cold air, the temperature distribution throughout the freezer compartment 106 can be kept uniform.

Further, the metal receiving member 123 is cooled by heat exchange between the metal receiving member 123 and cold air, and condensation on the surface of the metal receiving member 123 in contact with the outside due to a rapid temperature difference between the inside and outside is prevented.

As described above, in the present embodiment, the heat exchange suppressing portion has a structure in which a convex portion is provided on the lower surface of the partition wall and the convex portion and the storage case are brought into contact with each other. As a result, the convex portion provided on the partition wall and the storage case are sealed, and the flow of cold air to the heated metal receiving member side is reduced, and with a simple configuration, the warming of the cold air can be suppressed and the cooling efficiency can be improved. A refrigerator with improved power consumption can be provided. Also, by providing a heat insulating member directly below the metal receiving member, for example, even if cold air leaks to the metal receiving member side, heat transfer from the heat radiating pipe to the surface in contact with the cold air passes through the heat insulating member having low thermal conductivity. Reduced, prevents temperature rise on the surface in contact with cold air, and suppresses heat exchange. Thereby, warming of cold air can be suppressed more, cooling efficiency can be improved, and as a result, power consumption can be reduced more.

In this embodiment, the heat insulating member 130 is provided directly below the metal receiving member 123, but the heat insulating member 130 may not be provided.

In the present embodiment, the convex shape 150 is configured integrally with the partition wall 122, but may be configured separately.

(Embodiment 3)
FIG. 7 is a longitudinal cross-sectional view of the basic structure of a storage room adjacent to the machine room of the refrigerator in Embodiment 3 of the present invention. FIG. 8 is an enlarged cross-sectional view of the lower part of the heat insulation door of the storage room adjacent to the machine room of the refrigerator according to Embodiment 3 of the present invention. In addition, about the thing which makes the structure similar to Embodiment 1, it attaches | subjects and demonstrates the same code | symbol, and abbreviate | omits detailed description.

As shown in FIG. 7, the dimension c is the dimension of the insulation wall thickness of the bottom insulation wall 133 of the storage chamber 106. As shown in FIG. 8, a metal receiving member 131 is provided on the front surface of the bottom heat insulating wall 133 so as to extend outside the storage chamber, and a door gasket 122 is provided at an end of the inner surface of the heat insulating door 119. The metal receiving member 131 is in close contact with the door gasket 122 to prevent cold air from leaking to the outside.

Further, the folded flange portion of the metal receiving member 131 is embedded in the bottom heat insulating wall 133.

Here, the c1 dimension is the height dimension from the bottom surface of the outer box 102 to the folded tip of the metal receiving member 131, and the c2 dimension is the height dimension from the folded flange end of the metal receiving member 131 to the storage chamber 106, that is, the heat insulation distance. It is. The c1 dimension is fixed.

In the present embodiment, for example, the b dimension (= b1 + b2) is larger than the a dimension shown in FIG. 2, and the c dimension (= c1 + c2) is larger. Specifically, in the present embodiment, the dimension a which is the wall thickness of the heat insulating wall between the storage chamber 106 and the machine room 107 is 60 mm, and the dimension b which is the wall thickness of the heat insulating partition wall 121 is 70 mm (the dimension b1 is 49 mm, b2 dimension is 21 mm), and c dimension which is the wall thickness of the bottom heat insulating wall 133 is 71 mm (c1 dimension is 41 mm, c2 dimension is 30 mm).

Although the outside air penetrates into the storage chamber 106 due to the heat conduction of the metal receiving member 131, the temperature is almost equal to that of the outside air up to the end of the folded flange of the metal receiving member 131. Therefore, the contribution of the heat insulation distance, that is, the dimension c2 in FIG. Is very high. It can be seen that the c2 dimension is small in the wall thickness of the bottom heat insulating wall 133 that is set only by the temperature difference between the outside and the inside of the storage chamber as in the prior art, that is, the heat insulating distance is small, and the amount of intrusion heat is very large.

FIG. 9 is a relationship diagram of the amount of heat entering the refrigerator storage room and the heat insulation wall thickness ratio (the value obtained by dividing the average value of the b dimension and the c dimension by the a dimension) in the third embodiment of the present invention. Region I indicates a region where a dimension <b dimension and a dimension <c dimension.

As shown in FIG. 9, when the heat insulation wall thickness ratio is increased, the amount of heat penetration decreases, but increases again with the lowest point being a certain value as a boundary. In other words, when the volumetric efficiency indicating the volume ratio of the storage space to the external shape is 30% to 70%, the heat insulation wall thickness that minimizes the amount of intrusion heat under the precondition that the external dimensions and storage volume of the refrigerator are properly maintained. A ratio exists. At that time, a dimension <b dimension and a dimension <c dimension are established.

Therefore, as in this embodiment, the dimension b, which is the wall thickness of the heat insulating partition wall 121, is larger than the dimension a, which is the wall thickness of the heat insulating wall provided between the storage chamber 106 and the machine room 107, and is stored. The dimension c, which is the wall thickness of the bottom heat insulating wall 133, is made larger than the dimension a, which is the wall thickness of the heat insulating wall provided between the chamber 106 and the machine room 107. Thereby, the penetration | invasion heat through a heat insulation wall and the penetration | invasion heat from an opening part can be reduced comprehensively.

Also, since the intrusion heat can be reduced to prevent the temperature rise on the surface of the storage chamber, the cold air circulates at a low temperature, so that the temperature distribution in the entire storage chamber 106 can be kept uniform.

Further, the wall thickness of the heat insulating partition wall 121 is not necessarily constant with respect to the depth direction of the storage chamber 106. That is, the same effect can be obtained even when the wall thickness of the heat insulating partition wall 121 is made thicker than, for example, the dimension a shown in FIG. Obtainable.

(Embodiment 4)
FIG. 10 is a plan sectional view of a basic structure of a storage room adjacent to the machine room of the refrigerator according to Embodiment 4 of the present invention. FIG. 11 is an enlarged cross-sectional view of a heat insulating door side part of a storage room adjacent to the machine room of the refrigerator according to Embodiment 4 of the present invention. In addition, about the thing which makes the structure similar to Embodiment 1, it attaches | subjects and demonstrates the same code | symbol, and abbreviate | omits detailed description.

As shown in FIG. 10, the dimension d is the insulation wall thickness dimension of the side insulation wall 134 of the storage chamber 106. As shown in FIG. 11, a metal receiving member 132 is provided on the front surface of the side heat insulating wall 134 so as to extend outside the storage chamber, and a door gasket 122 is provided at the end of the inner surface of the outer box 102. The metal receiving member 132 is formed integrally with the outer box 102 and prevents the cold air from leaking to the outside by bringing the door gasket 122 into close contact.

Further, the metal receiving member 132 is embedded in the side wall heat insulating wall 134 of the folded flange portion.

Here, the dimension d1 is a width dimension from the side surface of the outer box 102 to the end of the folded funnel of the metal receiving member 132, and the dimension d2 is a width dimension from the end of the folded funger of the metal receiving member 132 to the storage chamber 106, that is, the heat insulation distance. . The d1 dimension is fixed.

In the present embodiment, for example, the dimension b (= b1 + b2) is larger than the dimension a shown in FIG. 2, and the dimension c (= c1 + c2) is larger than the dimension a shown in FIG. 2, for example, as shown in FIG. The heat insulation wall thickness dimension d (= d1 + d2) of the side heat insulation wall 134 is made larger than the dimension a. Specifically, in the present embodiment, the dimension a which is the wall thickness of the heat insulating wall between the storage chamber 106 and the machine room 107 is 60 mm, and the dimension b which is the wall thickness of the heat insulating partition wall 121 is 70 mm (the dimension b1 is 49 mm, b2 dimension is 21 mm), c dimension which is the wall thickness of the bottom heat insulating wall 133 is 71 mm (c1 dimension is 41 mm, c2 dimension is 30 mm), d dimension which is the wall thickness of the side heat insulating wall 134 is 65 mm (d1 dimension is 20 mm, d2 dimension is 45 mm).

About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. Note that description of operations and actions similar to those in

Embodiment

1 or 2 is omitted.

Although the outside air enters into the storage chamber 106 due to the heat conduction of the metal receiving member 132, the temperature is almost equal to that of the outside air up to the end of the folded flange of the metal receiving member 132. Therefore, the contribution of the heat insulation distance, that is, the d2 dimension in FIG. Is very high. It can be seen that, as in the prior art, the wall thickness of the side heat insulating wall 134 set only by the temperature difference between the inside and outside of the storage chamber has a smaller d2 dimension, that is, a smaller heat insulating distance and a very large amount of intrusion heat.

FIG. 12 shows the relationship between the amount of heat entering the storage room of the refrigerator and the heat insulation wall thickness ratio (the value obtained by dividing the average value of b dimension, c dimension, and d dimension by a dimension) in Embodiment 4 of the present invention. It is a thing. The region I indicates a region where a dimension <b dimension, a dimension <c dimension, and a dimension <d dimension.

As shown in FIG. 12, when the heat insulation wall thickness ratio is increased, the heat penetration amount decreases, but increases again with the lowest point being a certain value as a boundary. In other words, when the volumetric efficiency indicating the volume ratio of the storage space to the external shape is 30% to 70%, the heat insulation wall thickness that minimizes the amount of intrusion heat under the precondition that the external dimensions and storage volume of the refrigerator are properly maintained. A ratio exists. At that time, a dimension <b dimension, a dimension <c dimension, and a dimension <d dimension are established.

Therefore, as in the present embodiment, the dimension b, which is the wall thickness of the heat insulating partition wall 121, is larger than the dimension a, which is the wall thickness of the heat insulating wall provided between the storage chamber 106 and the machine room 107, and the storage chamber. Insulation provided between the storage chamber 106 and the machine room 107, and the c dimension, which is the wall thickness of the bottom heat insulation wall 133, is larger than the dimension a, which is the wall thickness of the insulation wall provided between the machine room 107 and the machine room 107. The dimension d which is the wall thickness of the side heat insulating wall 134 is made larger than the dimension a which is the wall thickness. Thereby, the penetration | invasion heat through a heat insulation wall and the penetration | invasion heat from an opening part can be reduced comprehensively.

Also, the wall thickness of the side heat insulating wall 134 is not necessarily constant with respect to the depth direction of the storage chamber 106. That is, the same effect can be obtained even if the wall thickness of the side heat insulating wall 134 is made larger only in the vicinity of contact with the metal receiving member 132 in the vicinity of the opening, for example, the dimension a shown in FIG.

The refrigerator of the present invention is useful for household or commercial refrigerators or vegetable storages.

100 refrigerator 101 heat insulation box 102 outer box 103 inner box 104 storage room (refrigeration room)
105 Storage room (vegetable room)
106 Storage room (freezer room)
107 Machine room 108 Compressor 109 Cooling room 110 Back surface partition wall 111 Cooler 112 Cooling fan 113 Radiant heater 114 Drain pan 115 Passage path 116 Evaporating

tray

117, 118, 119

Thermal insulation door

120, 121 Thermal insulation partition wall 122

Door gasket

123, 132 Metal receiving member 124 Cold air outlet 125

Cold air inlet

126, 127, 128 Storage case 130 Heat insulating member 131 Heat radiating pipe 133 Bottom heat insulating wall 134 Side heat insulating wall 150 Convex portion

Claims

An insulated box,
A heat insulating door for opening and closing the front surface of the opening of the heat insulating box;
A storage room having the heat insulation box and the heat insulation door;
A heat insulating partition wall that divides the storage chamber into a plurality of storage chambers;
A machine room provided in a lower part of the heat insulating box for storing the compressor,
The refrigerator which made the wall thickness of the said heat insulation partition wall larger than the wall thickness of the heat insulation wall provided between the said store room and the said machine room.
The wall thickness of the heat insulating wall provided between the storage room and the machine room is:
The refrigerator according to claim 1, wherein the refrigerator is the largest portion in the heat insulating wall covering the machine room.
The heat insulating wall provided between the storage room and the machine room is
The refrigerator according to claim 1, wherein the refrigerator is a heat insulating wall facing in the front-rear direction of the machine room.
The heat insulating wall provided between the storage room and the machine room is
The refrigerator according to claim 1, wherein the refrigerator is a heat insulating wall that does not have a through passage in a heat insulating wall that covers the machine room.
The heat insulating wall provided between the storage room and the machine room is
The refrigerator according to claim 1, wherein the refrigerator is a heat insulating wall facing the storage room side of the machine room.
The wall thickness of the bottom heat insulating wall forming the storage chamber,
The refrigerator according to any one of claims 1 to 5, wherein the refrigerator is larger than a wall thickness of a heat insulating wall provided between the storage room and the machine room.
The wall thickness of the side heat insulating wall forming the storage room,
The refrigerator according to any one of claims 1 to 5, wherein the refrigerator is larger than a wall thickness of a heat insulating wall provided between the storage room and the machine room.
A metal receiving member provided in front of the heat insulating partition wall;
A heating unit arranged so as to be in close contact with the side surface of the storage chamber of the metal receiving member,
The refrigerator according to claim 1, further comprising a heat exchange suppression unit that suppresses heat exchange between the cold air in the storage chamber and the metal receiving member between the metal receiving member and the storage chamber.
The refrigerator according to any one of claims 1 to 8, wherein the storage room is a freezing room.
The refrigerator according to any one of claims 1 to 8, further comprising a storage case that can be pulled out into the storage chamber.
The wall thickness of the heat insulating partition wall is made thicker than the wall thickness of the heat insulating wall provided between the storage chamber and the machine room only in the vicinity of contact with the metal receiving member, and other portions are made thinner than the wall thickness. Item 9. The refrigerator according to Item 8.
The refrigerator according to claim 8, wherein the heat exchange suppression unit is configured by providing a heat insulating member between the metal receiving member and the storage chamber.
The refrigerator according to claim 8, wherein the heat exchange suppression unit is provided with a convex portion on a lower surface of the heat insulating partition wall, and the convex portion and the storage case are brought into contact with each other.