JP2005077078A - Cooling chamber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a freezing chamber capable of enhancing working efficiency in assembling by simplifying piping work, and capable of cooling efficiently an inner container. <P>SOLUTION: This cooling chamber is provided with a casing 1 having the heat-conductive inner container 3, a heat sink 13 provided as a heat absorbing part in an inside of the inner container 3, a Stirling cycle refrigerator 7 arranged outside the inner container 3, a condenser 19 fixed to a cooling part 7a of the Stirling cycle refrigerator 7, and a heat pipe 20 connected between the heat sink 13 and the condenser 19 and sealed with a refrigerant in its inside. One end of the heat pipe 20 is formed into a leading-up part 22 for contacting with the heat sink 13 and the inner container 3, and a bently curved part 23 is formed to contact with the condenser 19 from an upper end of the leading-up part 22 toward the cooling part 7a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention mainly relates to a refrigerator that cools stored items such as foods and beverages, and particularly relates to a refrigerator that cools an inner container by condensing a refrigerant.

Conventionally, as this type of refrigerator, a condensing unit connected to a cooling unit of a refrigeration apparatus, a liquid pipe connected to the condensing unit, and an inner container of the refrigerator connected thermally to the liquid pipe There is known a thermosiphon in which a working fluid is sealed in a closed path composed of an evaporation pipe provided so as to be in contact with and a gas pipe connected to the evaporation pipe and returning to the condensation section. In this thermosiphon, the working fluid is deprived of condensation heat and condensed in the condensing part attached to the refrigerator, and the condensed working fluid flows down the liquid pipe by gravity and reaches the evaporation pipe. And in this evaporation part, the working fluid takes vaporization latent heat from the inner container and vaporizes, and this vaporized working fluid rises up the gas pipe and reaches the condensing part. (See Patent Document 1)
JP 2002-139285 A

  However, in the thermosyphon, the liquid pipe for enclosing the working fluid and the evaporation pipe are constituted by a copper pipe having a circular cross section, and this is routed into the cabinet, so that the piping work is troublesome. That is, the evaporation tube must be bent along the inner container so as to be in thermal contact with the inner container, and the operation of bending the copper tube so as to conform to the shape of the inner container is not only complicated and inefficient, but also has a cross section. Since the evaporation pipe made of a circular copper tube has a small contact area with the inner container, the cooling efficiency of the inner container is also poor. For this reason, in order to increase the cooling efficiency, the copper tube must be bent along the entire circumference of the inner container to increase the contact area with the inner container. Due to the deterioration of work efficiency associated with the pipe bending work, the assembly work efficiency is further deteriorated.

  Therefore, in view of the above-described problems of the prior art, the present invention aims to provide a freezer capable of simplifying piping work to increase assembly work efficiency and efficiently cooling an inner container. And

  In order to achieve the above object, a refrigerator according to the present invention includes a housing having a thermally conductive inner container, a heat absorption part provided inside the inner container, and a Stirling cycle refrigeration disposed outside the inner container. And a condenser fixed to a cooling part of the Stirling cycle refrigerator, and a heat pipe connected to the heat absorbing part and the condenser and having a refrigerant enclosed therein, and one end of the heat pipe is connected to the heat absorbing part And a rising portion to be brought into contact with the inner container, and a bent portion connected to the condenser is formed from the upper end portion of the rising portion toward the cooling portion.

  According to the refrigerator according to the present invention configured as described above, when the Stirling cycle refrigerator is operated, heat is absorbed by the cooling unit of the Stirling cycle refrigerator, and the heat is passed through the condenser connected to the cooling unit. The pipe will be cooled. Thereby, the refrigerant sealed in the heat pipe is a gas immediately after flowing from the rising part into the bent part, but condenses inside the bent part connected to the condenser and becomes a liquid to become the rising part. To flow down. The refrigerant that has flowed into the rising portion takes heat from the inner container and the heat absorbing portion that are in contact with the rising portion, evaporates, then rises in the rising portion, returns to the bent portion, and is again deprived of heat and condensed. By repeating the above operation, the inner container is cooled. And by bringing the rising part of the heat pipe into thermal contact with the inner container and the heat absorbing part, not only the heat is taken from the inner container and the inner container is directly cooled, but also the air around the heat absorbing part is cooled. Thus, the inside of the inner container can be efficiently cooled. In addition, since the heat pipe only needs to be disposed between the inner container and the heat absorbing portion, the piping operation of the heat pipe can be simplified. Furthermore, it is possible to arrange the Stirling cycle refrigerator upright so that the piston built in the Stirling cycle refrigerator is oriented in the vertical direction, and it is possible to make a rational arrangement that does not apply load to the piston part that is a movable part It becomes.

  Here, the rising portion may be sandwiched between the heat absorbing portion and the inner container.

  When comprised in this way, a rising part can be reliably connected with a wide contact area between a heat absorption part and an inner container, and, thereby, cooling efficiency can be improved.

  Furthermore, while the said bending part has an inclined part inclined so that it may become high toward the said condenser, the receiving part of the same inclination as the said inclined part may be provided in the said condenser.

  When comprised in this way, the refrigerant | coolant which became the liquid by condensing in the inclination part can be forced to flow down to a standing part. Thereby, a refrigerant | coolant does not accumulate in the middle of a circulation circuit, and even if a device is started, circulation is not prevented. Furthermore, it is possible to connect the heat pipe in a state where the Stirling cycle refrigerator is in an upright state, and the heat pipe is securely in contact with the condenser. It becomes possible to make it a typical arrangement.

  Further, the heat pipe may be formed in a flat plate shape.

  When comprised in this way, it can connect in the state which made the surface contact the heat pipe, the heat absorption part, and the inner container. Thereby, the contact area with the heat absorption part and an inner container can be taken widely, and the cooling efficiency of a refrigerator can be improved.

  According to the refrigerator according to claim 1 of the present invention, a housing having a thermally conductive inner container, a heat absorption part provided inside the inner container, and a Stirling cycle refrigeration disposed outside the inner container. And a condenser fixed to a cooling part of the Stirling cycle refrigerator, and a heat pipe connected to the heat absorbing part and the condenser and having a refrigerant sealed therein, and one end of the heat pipe is connected to the heat absorbing part And a rising portion to be brought into contact with the inner container, and a bent portion connected to the condenser is formed from the upper end portion of the rising portion toward the cooling portion, so that heat is taken from the inner container and the heat sink. In addition to cooling the inner container directly, the air around the heat absorbing part can be cooled to cool the inner container efficiently, and a heat pipe is arranged between the inner container and the heat absorbing part. Set up Dealt with in only, it is possible to simplify the tedious plumbing.

  Moreover, according to the refrigerator of Claim 2, in the said Claim 1, since the said rising part is pinched | interposed by the heat absorption part and the said inner container, a rising part is made between a heat absorption part and an inner container. Thus, it is possible to reliably connect with a wide contact area, thereby improving the cooling efficiency.

  Moreover, according to the refrigerator of Claim 3, in the said Claim 1, while the said bending part has an inclination part inclined so that it may become high toward the said condenser, the said inclination part is provided in the said condenser. Since the refrigerant that has condensed and formed a liquid in the inclined part is forced to flow down to the rising part, the refrigerant is prevented from accumulating in the middle of the circulation circuit. Not only can the circulation of the refrigerant be prevented, but also the heat pipe can be connected in a state in which it is in reliable contact with the condenser while the Stirling cycle refrigerator is kept upright.

  Moreover, according to the refrigerator of Claim 4, since the said heat pipe is formed in flat form in any one of the said Claim 1 thru | or 3, the contact area of a heat pipe, a thermal absorption part, and an inner container The cooling efficiency of the refrigerator can be increased.

  As shown in FIG. 1, it is desirable that the bent portion is an inclined portion as a whole so as not to disturb the flow of the refrigerant sealed inside. Further, in FIGS. 1 and 2, for the sake of simplification of the drawings, the Stirling cycle engine cooling part, the bending part, and the condenser are described in a state exposed in the storage chamber, but these are covered with a heat insulating material. It is desirable that

  A preferred embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 1 denotes a casing. The casing 1 includes an outer shell 2, an inner container 3 made of a heat conductive material such as aluminum, and the outer shell 2 and the inner container 3. It is comprised with the heat insulating material 4 provided. An opening 1a is formed on the front surface of the housing 1, and a lid 5 having a heat insulating material 4a inside is attached to the opening 1a so as to be freely opened and closed.

  A housing chamber 6 is formed in the rear wall portion of the housing 1, and a Stirling cycle refrigerator 7 for cooling the inner container 3 is housed in the housing chamber 6. This Stirling cycle refrigerator 7 is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-337725, etc., and a piston that can reciprocate in a cylinder (not shown), a drive device that reciprocates the piston in the axial direction, and the piston And a displacer that reciprocates in the axial direction. The Stirling cycle refrigerator 7 is fixed to a plurality of mounting bosses 8 provided in the storage chamber 6 through vibration-proof rubbers 9. In addition, the said Stirling cycle refrigerator 7 is standingly arranged so that the said piston and a displacer may become perpendicular | vertical, and the said inner container 3 is arranged in parallel.

  A partition chamber 12 partitioned by a partition plate 11 having a plurality of vent holes 10 is formed at the rear of the inner container 3, and a heat sink 13 serving as a heat absorbing portion is provided inside the partition chamber 12. The heat sink 13 is made of a highly heat conductive material such as aluminum, and includes a flat substrate portion 14 and a large number of fins 15 formed in parallel on the surface side of the substrate portion 14. The cooling unit 7a formed at the tip of the Stirling cycle refrigerator 7 is provided with a heat conduction block 16 made of a good heat conductive material such as aluminum. The heat conduction block 16 attached to the cooling unit 7a and the heat sink 13 in the inner container 3 are connected by a heat pipe 20. The heat pipe 20 is formed in a flat plate shape as a whole by forming a plurality of parallel cavity portions (not shown) for circulating the refrigerant in the inside thereof, and provided at both ends of the heat pipe 20. A refrigerant is sealed in the heat pipe 20 by the sealing member 21. One end portion of the heat pipe 20 is a rising portion 22 that rises vertically so as to be in close contact with the rear wall portion 3 a of the inner container 3, and the other end portion of the heat pipe 20 is the rising portion 22. The bent portion 23 is bent from the upper end toward the Stirling cycle refrigerator 7 and is in thermal contact with the heat conduction block 16. The bent portion 23 is configured by an inclined portion 24 that is inclined so as to become higher from the rising portion 22 toward the Stirling cycle refrigerator 7. In order to mechanically and thermally transfer the tip of the inclined portion 24 to the heat conduction block 16, the heat conduction block 16 includes a lower block 17 fixed to the cooling portion 7a, The upper block 18 is fixed to the lower block 17. The receiving portions 17a and 18a having the same inclination as the inclined portion 24 are formed on the opposing surfaces of the lower block 17 and the upper block 18, and the receiving portions 17a, The lower block 17 and the upper block 18 are sandwiched and fixed in a state where the inclined portion 24 of the heat pipe 20 is in close contact with 18a. In this way, by connecting the inclined portion 24 to the heat conduction block 16 in a heat transfer manner, the inclined portion 24 and the heat conduction block 16 constitute a condenser 19. 1 and 2, reference numeral 30 denotes a circulation fan fixed to the partition plate 11 so as to face the heat sink 13, and in FIG. 2, reference numeral 31 denotes an intake fan fixed to the lower portion of the storage chamber 6. 32 are exhaust fans fixed to the upper part of the storage chamber 6.

  The effect | action is demonstrated about the said structure. When the Stirling cycle refrigerator 7 is operated, heat is absorbed by the cooling unit 7a of the Stirling cycle refrigerator 7, and the heat pipe 20 passes through the lower block 17 of the heat conduction block 16 connected to the cooling unit 7a. The inclined portion 24, that is, the condenser 19 is cooled. As a result, the refrigerant sealed in the heat pipe 20 is condensed by being deprived of heat in the inclined portion 24 constituting the condenser 19, and flows down the inclined portion 24 as a liquid. At this time, since the inclined portion 24 is inclined so as to descend toward the inner container 2, the condensed refrigerant flows through the inclined portion 24 toward the rising portion 22, and then flows through the rising portion 22. Flow down. The refrigerant that has flowed into the rising portion 22 is vaporized by removing heat from the inner container 3 and the heat sink 13 that are in contact with and sandwiching the rising portion 22, and then rises up the rising portion 22 to the inclined portion 24. Return to. Then, the refrigerant that has returned to the inclined portion 24 is deprived of heat again in the inclined portion 24 and condensed by the condenser 19 that constitutes a part of the inclined portion 24. By repeating the above operation, heat is transferred from the inner container 3 and the heat sink 13 to the cooling unit 7a of the Stirling cycle refrigerator 7 through the heat pipe 20 and the heat conduction block 16 constituting the condenser 19. By continuing, the inside of the inner container 3 is cooled.

  As described above, the rising portion 22 of the heat pipe 20 is sandwiched between the inner container 3 and the heat sink 13, and the inner container 3 and the heat sink 13 are brought into thermal contact with each other. In addition to cooling the inner container 3 directly, the air around the heat sink 13 can be cooled to cool the compartment 12 partitioned by the partition plate 11. Thus, the cool air in the compartment 12 cooled by the heat sink 13 is blown into the inner container 3 by the circulation fan 30 attached to the partition plate 11, so that the inside of the inner container 3 can be efficiently performed. Can be cooled to. Further, since the heat pipe 20 is formed in a flat plate shape and is connected to the inner container 3 and the heat sink 13 in a surface contact state, the contact area between the inner container 3 and the heat sink 13 is increased. Therefore, the inner container 3 and the heat sink 13 can be efficiently cooled. Further, since the heat pipe 20 only needs to be disposed between the heat sink 13 and the heat conduction block 16, piping work is extremely easy. Further, since the heat pipe 20 only bends the inclined portion 24 from the rising portion 22, there is no need for troublesome piping work such as rolling the copper tube over almost the entire circumference of the inner container 3 as in the prior art. Therefore, assembly work efficiency can be improved.

  Further, since the bent portion 23 bent from the rising portion 22 is constituted by the inclined portion 24 which becomes higher toward the Stirling cycle refrigerator 7, the liquid condensed in the inclined portion 24 constituting the condenser 19 Can be forced to flow down to the rising portion 22 by gravity. That is, when the bent portion 23 is bent horizontally, the bent portion 23 collides with other assembled parts or the like during assembly, or an assembly error between the Stirling cycle refrigerator 7 and the heat pipe 20 occurs. However, the bent portion 23 is inclined so as to descend toward the cooling portion 7a, and the liquid refrigerant condensed in the bent portion 23 may flow backward. As described above, the bent portion 23 of the heat pipe 20 is configured by the inclined portion 24 that is inclined so as to become higher toward the cooling portion 7a of the Stirling cycle refrigerator 7, thereby configuring the condenser 19. Thus, it is possible to prevent the liquid refrigerant condensed in the inclined portion 24 from flowing back, and to reliably flow the refrigerant down to the rising portion 22. Thus, the refrigerant does not accumulate in the heat pipe 20.

  Further, when the Stirling cycle refrigerator 7 is connected to the heat pipe 20, the cylinder, piston and displacer in the Stirling cycle refrigerator 7 are inclined so that the piston and displacer are in the center of the cylinder. This is not preferable because gravity is applied in a direction deviating from the axis, but in this embodiment, the receiving portions 17a and 18a having the same inclination as the inclination of the inclined portion 24 are attached to the cooling portion 7a of the Stirling cycle refrigerator 7. Formed in the lower block 17 and the upper block 18 constituting the conduction block 16, and by fixing the inclined portion 24 therebetween, the Stirling cycle refrigerator 7 is erected so that the piston and the displacer are vertical. The heat pipe 20 and the heat conduction block 16 can be reliably connected in a heat transfer manner. It can be a rational arrangement not adversely affected by gravity. In addition, by arranging the Stirling cycle refrigerator 7 in an upright state, the storage chamber 6 of the Stirling cycle refrigerator 7 can be thinned, and thus the entire housing 1 can be downsized. .

  As mentioned above, although the Example of the refrigerator of this invention was explained in full detail, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the scope of the summary of this invention. For example, in the above embodiment, a flat plate having a large contact area is shown as the heat pipe. However, the heat pipe is not limited to a flat plate, and even if it is formed of a conventional copper tube, it covers the entire circumference of the inner container. Therefore, piping work can be simplified. Moreover, what is necessary is just to select suitably the shape, structure, etc. of the heat conductive block fixed to the cooling part of the Stirling cycle refrigerator.

It is sectional drawing of the vertical direction of the refrigerator which concerns on this invention. It is sectional drawing of the horizontal direction of the refrigerator which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 3 Inner container 7 Stirling cycle refrigerator 7a Cooling part
13 Heat sink (heat absorption part)
17a, 18a receiving part
19 Condenser
20 Heat pipe
22 Rising section
23 Folding part
24 Slope

Claims (4)

  A housing having a heat conductive inner container, a heat absorption part provided inside the inner container, a Stirling cycle refrigerator disposed outside the inner container, and a cooling part of the Stirling cycle refrigerator. A condenser, a heat pipe connected to the heat absorber and the condenser, and having a refrigerant sealed therein; and a rising part that makes one end of the heat pipe contact the heat absorber and the inner container. A refrigeration box characterized in that a bent portion connected to the condenser is formed from the upper end portion toward the cooling portion.   The refrigerator according to claim 1, wherein the rising portion is sandwiched between the heat absorbing portion and the inner container. 2. The cooling according to claim 1, wherein the bent portion has an inclined portion inclined so as to become higher toward the condenser, and the condenser is provided with a receiving portion having the same inclination as the inclined portion. Warehouse. The refrigerator according to any one of claims 1 to 3, wherein the heat pipe is formed in a flat plate shape.

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