JP2005233543A - Direct cooling type refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain the circulated flow to allow the cold air from a cooler to smoothly flow toward a chilled case and a refrigerating chamber located at a lower position. <P>SOLUTION: This direct cooling type refrigerator comprises the cooler 5 provided with a freezing chamber 13 inside and having a cooling face on its circumferential wall, the chilled case 7 mounted at a lower position of the cooler 5 and also used as a dew receiving pan, and the refrigerating chamber 9 mounted at a lower position of the chilled case 8. A cold air circulation passage 31 is formed at both side parts and a rear part of the chilled case 7 to allow the cold air from the cooler to flow down toward the refrigerating chamber 9, and the smooth flow of the cold air toward the lower refrigerating chamber 9 is secured without accumulating the cold air in an area of the chilled case 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a direct-cooling refrigerator suitable for a chilled case comprising a single door and having a chilled case serving also as a dew tray below the cooler.

  In general, the outline of a direct-cooling refrigerator consists of a box-shaped cooler whose inside is formed in a freezer, a chilled case that is placed under the cooler and also serves as a dew tray, and a refrigerator that is placed under the chilled case. It is possible to take in and out the chilled case, food items in the refrigerator compartment, etc., including the cooler that becomes a freezer compartment by opening one door.

The cool air from the cooler cools the inside of the cabinet by directly cooling the inside of the cabinet, then descending to the chilled case and the refrigerator compartment by natural convection, and returning to the cooler again. ing.
JP-A-8-271131

  The flow of cool air in a direct-cooled refrigerator flows in the order of the chilled case located in the lower part of the cooler and the refrigerator compartment, but the chilled case is located between the cooler and the refrigerator compartment as a blocking wall that inhibits the flow of cool air. Comes to work. For this purpose, the following problems are involved.

  (1) Cold air stays in the chilled case and does not flow downward, leading to insufficient cooling in the refrigerator compartment located at the lower level.

  (2) The inside of the chilled case is too cold, resulting in overcooling due to the overcooling.

  (3) The cooling air flow becomes unstable due to the influence of the cold air retention by the chilled case, so that the frosting unevenness of the cooler that leads to the cooling unevenness occurs. In order to keep this small, the periphery of the cooler has a wide passage width that ensures a smooth flow of cool air. However, the wide passage width causes a problem that the size of the cooler is restricted.

  Therefore, an object of the present invention is to provide a direct-cooling refrigerator that can solve the above problems by ensuring a smooth flow of cool air in the order of a cooler, a chilled case, and a refrigerator compartment.

  In order to achieve the above-mentioned object, in the present invention, a cooler in which the inside is formed in a freezer compartment and the surrounding wall serves as a cooling surface, a chilled case disposed under the cooler and also serving as a dew tray, and a chilled case A refrigeration chamber disposed below the chilled case, and provided with cold air passages for circulating cold air to lower the cold air from the cooler toward the refrigeration chamber on both sides and rear of the chilled case. It is characterized by.

  According to the present invention, the cold air from the cooler that directly cools the inside of the freezer compartment can obtain a smooth flow of cold air toward the lower refrigerator compartment without staying more than necessary in the chilled case by the cold air passage. Can do.

  As a result, the chilled case can be prevented from being overcooled, and the cooling efficiency of the refrigerator compartment located at the lowest level can be increased. Further, since the width of the passage provided around the cooler can be reduced, the internal volume can be increased accordingly. And the frost unevenness of a cooler can be suppressed small.

  First, the rear end of the cooler is brought close to the back wall of the refrigerator body, and the back wall is used as the rear wall of the cooler, while the rear wall of the cooler is spaced from the rear wall of the cooler. The support shelf protruding from the back wall surface is disposed, and the support shelf is provided with a cold air circulation vent vertically passing through the support shelf to ensure a flow of cool air smoothly flowing downward in the rear region. The number of parts is deleted by omitting the back plate.

  Secondly, the cold air circulation vent is provided with a net-like slat or a net shelf for preventing food from falling.

  Hereinafter, embodiments of the present invention will be specifically described with reference to FIGS. 1 to 5.

  FIG. 1 is a schematic front view of a direct cooling refrigerator according to the present invention, and FIG. 2 is a schematic cut side view.

  Inside the refrigerator main body 3 of the direct cooling refrigerator 1, a cooler 5 is provided at the uppermost position, and a chilled case 7 is provided at a lower position, and a lower portion of the chilled case 7 is a refrigerator 9.

  The front of the cooler 5, the chilled case 7, and the refrigerator compartment 9 is a one-door type provided with one door 11, and foods and the like can be taken in and out by opening the door 11.

  In the cooler 5, a peripheral wall composed of an upper surface 5a, a lower surface 5b, and both side surfaces 5c is a planar cooling surface. The cooling surface may be three surfaces excluding the lower surface 5b, or two surfaces of both side surfaces 5c, and the inside surrounded by the cooling surface is a freezer compartment 13 that is directly cooled by the cooling surface.

  Although the cooler 5 is not shown, a compressor, a condenser, and a throttling device constitute a refrigeration cycle, and the front of the cooler 5 is an inlet / outlet 15. The inlet / outlet port 15 can be opened and closed by a cooler door 17.

  The rear end portion of the cooler 5 is disposed close to the back wall surface 19 of the refrigerator body 3, the back wall surface 19 functions as the rear wall of the cooler 5, and the back plate of the cooler 5 is omitted. It has a shape.

  As shown in FIGS. 2 and 3, a support shelf 21 protrudes from the back wall 19 in the gap d between the rear end of the cooler 5 and the back wall 19 of the refrigerator body 3. The support shelf 2 is for preventing the cooler 5 from falling, and has a cold air circulation vent 23 penetrating vertically.

  The larger the size of the cold air circulation vent 23, the smoother the flow of the cold air can be expected. On the other hand, the diameter of the cold air circulation vent 23 is not shown because it is a factor that causes food or the like to fall. It is desirable to have a lattice shape.

  In this case, a net shelf 25 is provided on the upper surface of the cold air circulation vent 23 so that small objects do not fall.

  Note that a net-like slat may be used instead of the net shelf 25.

  The chilled case 7 is supported at both ends so that it can be pulled out by the left and right guide rails 27 without any partition wall between the chilled case 7 and the cooler 5.

  The bottom portion 29 of the chilled case 7 has a shape that also serves as a dew receiving tray that receives water droplets from the upper cooler 5. A cold air passage 31 is provided.

  As shown in FIG. 4, the cold air passages 31 on both sides of the chilled case have a shape of a long hole extending in the front-rear direction provided in the left and right bent stepped portions 33 raised one step from the bottom 29 of the chilled case 7. In this case, the hole shape may be a round hole or a shape that is continuous in the vertical direction.

  The cold air passage 31 at the rear of the chilled case serves as the gap d provided between the refrigerator main body 3 and the back wall surface 19.

  The refrigerator compartment 9 has no partition wall between the chilled case 7 and a shelf board 35 and a vegetable case 37 that can be pulled out.

  According to the direct cooling refrigerator configured as described above, the cold air from the cooler 5 that has directly cooled the inside of the freezer compartment 13 descends by natural convection and enters the lower chilled case 7 or the chilled case. After the inside of the cooling chamber 7 is cooled, the flow flows toward the lower refrigerator compartment 9 through the cold air passage 31.

  The cold air that has reached the inside of the refrigerating chamber 9 and has finished its work rises as heat is taken away and the temperature rises, and the natural air travels from the periphery of the cool air circulation inlet 39 of the cooler 5 and the cooler door 17 to the cooler 5 again. The inside of the chilled case 7 and the inside of the refrigerator compartment 9 are cooled by the convection as well as the inside of the cooler 5.

  During this operation, the cool air from the cooler 5 can be smoothly flown toward the lower refrigerator compartment 9 without staying more than necessary in the chilled case 7 by the cool air passage 31. As a result, the cause of the unstable flow of the cold air is eliminated, the frost formation unevenness of the cooler 5 is suppressed, and the cooler 5 can be fully expanded up to the upper side of the refrigerator compartment body 3 and both side wall surfaces. Thus, the internal volume can be increased. Further, overcooling in the chilled case 7 is eliminated, and the cooling efficiency in the refrigerator compartment 9 located at the lower level is improved. Table 1 shows the experimental results.

Table 1 shows representative examples of various experiments, and shows performance results during continuous operation at room temperature of 30 ° C. and no load (a state in which nothing is in the room).

  According to this, it is understood that the cooler 5 is improved in temperature from the conventional −20.2 ° C. to −18.6 ° C., and a reliable cooling state can be obtained as a freezer.

  In the chilled case 7, a temperature improvement from the conventional -17.8 ° C to -10.8 ° C is recognized, and it can be seen that overcooling is suppressed.

  In the refrigerator compartment 9, a temperature improvement from −2.0 ° C. to −7.0 ° C. is recognized, and the cooling efficiency is improved.

  From the above points, it was confirmed that an excellent performance result was obtained by a smooth flow of cold air.

The outline front view which omitted the door of the direct-cooling type refrigerator concerning this invention. The outline cutting side view of a direct-cooling refrigerator. The outline top view of a support shelf part. The outline top view of a chilled case. AA line sectional view of Drawing 4.

Explanation of symbols

3 ... refrigerator body 5 ... cooler 7 ... chilled case 9 ... refrigerator compartment 19 ... back wall 21 ... support shelf 23 ... cool air circulation vent 25 ... net shelf 31 ... cool air passage

Claims (3)

  A cooler having an inside formed in a freezer compartment and a peripheral wall serving as a cooling surface; a chilled case disposed below the cooler and serving as a dew receiving tray; and a refrigerated chamber disposed below the chilled case; A direct-cooling type refrigerator having cold air circulation passages for lowering the cool air from the cooler toward the refrigerating chamber at both sides and a rear portion of the case.   The rear end of the cooler is brought close to the back wall of the refrigerator body, and the back wall is used as the rear wall of the cooler, while the back wall is disposed in the gap from the rear end of the cooler to the back wall. The direct-cooling refrigerator according to claim 1, wherein a support shelf protruding from the inside is disposed, and a cold-circulation vent hole vertically passing through the support shelf is provided. 3. The direct cooling refrigerator according to claim 2, wherein a net-like slat or a net shelf for preventing food dropping is provided in the cold air circulation vent.

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