JP4609316B2 - refrigerator - Google Patents

Description

  The present invention relates to condensing means in which a condensing pipe is brought into close contact with an outer box of a refrigerator.

  In recent years, refrigerators using flammable refrigerants that have a small influence on ozone layer destruction and have a small global warming potential have become widespread. In a refrigerator using a flammable refrigerant, it is necessary to reduce the charging amount of the refrigerant from the viewpoint of ensuring safety, and thus the efficiency of the condensing means is increased (for example, see Patent Document 1).

  Hereinafter, the conventional refrigerator will be described with reference to the drawings.

  FIG. 14 is a schematic sectional side view (A) and a rear perspective view (B) of a conventional refrigerator. FIG. 15 is a configuration diagram showing a refrigeration cycle in a conventional refrigerator. FIG. 16 is an enlarged schematic view of a main part showing the configuration of a conventional heat radiating pipe.

  In FIG. 14, the main body 1 is composed of an outer box 2, an inner box 3, a foam heat insulating material 4 filled between the two, and a machine room 8 is provided at the bottom of the main body 1. The compressor 9, the condenser 14 formed of a pipe 14a and a heat radiating plate 14b and folded back several times with an equal width, and the blower 10 for radiating the heat generated from the compressor 9 and the condenser 14 are disposed. is doing.

  In addition, a cooler chamber 5 is provided on the back of the inner box 3, a cooler 6 that generates cool air in the cooler chamber 5, and a blower 7 that forcibly circulates the generated cool air are disposed, and the discharge of the compressor 9 Between the condenser and the inlet of the cooler 6, a condenser 14, a heat radiating pipe 11 also serving as the condenser 14, and a high-pressure side pipe constructed by sequentially connecting capillary tubes in series are connected. Between the outlet and the suction side of the compressor 9, a low-pressure side pipe configured by connecting a suction pipe 13 with a capillary tube 12 connected in series is connected.

  In FIG. 15, a compressor 9, a condenser 14, a heat radiating pipe 11, a capillary tube 12, and a cooler 6 are sequentially connected by a suction pipe 13 to form an annular closed circuit.

  In the above configuration, the refrigerant that has passed through the cooler 6 is compressed by the compressor 9 and becomes a high-temperature, high-pressure gaseous refrigerant. This gaseous refrigerant dissipates heat through the condenser 14 and the heat radiating pipe 11, and becomes a medium-temperature and high-pressure liquid refrigerant. Subsequently, the liquid refrigerant is depressurized by the capillary tube 12 and then evaporated while passing through the cooler 6 to become a low-temperature and low-pressure refrigerant gas, thereby forming a heat exchange function in each compartment. Thereafter, the refrigerant is sucked into the compressor 9 again in a gas state, thereby completing the refrigeration cycle.

In FIG. 13, the pipe interval A on the inlet side of the heat radiating pipe 11 is formed wider (A> B) than the pipe interval B on the outlet side, and the refrigerant is in a high temperature portion on the inlet side of the heat radiating pipe 11 in a gas phase state. The heat dissipation area is widened to improve the heat dissipation efficiency.
JP 59-222631 A

  However, in the conventional configuration, when the heat radiating pipes 11 are arranged on both side walls of the refrigerator, an effect is obtained on the side wall where the heat radiating pipes 11 located upstream in the flow direction of the refrigerant are obtained. In the flow, on the side wall where the heat dissipating pipe 11 located downstream is disposed, the refrigerant flowing through the heat dissipating pipe 11 has a high wettability, the condensing latent heat cannot be effectively used, and the heat dissipating efficiency cannot be improved. In addition, there was a problem that the refrigerant charging amount could not be reduced.

  This invention solves the said conventional subject, and it aims at providing the refrigerator which can reduce a refrigerant | coolant by reducing the total volume of a thermal radiation pipe by the improvement of thermal radiation efficiency.

  Moreover, in the said conventional structure, since the refrigerant | coolant filling amount cannot be reduced, in the refrigerator using a combustible refrigerant | coolant, there existed a subject that the safety | security when a refrigerant | coolant leaked was low.

  This invention solves the said conventional subject, and it aims at providing a highly safe refrigerator by reducing the total volume of a thermal radiation pipe by the improvement of thermal radiation efficiency.

  Moreover, in the said conventional structure, since the condensing latent heat cannot be used effectively and the improvement of heat dissipation efficiency cannot be aimed at, it had the subject that driving | operation efficiency could not be improved.

  This invention solves the said conventional subject, and it aims at providing the refrigerator which can save energy by the improvement of driving efficiency.

In order to solve the above-described conventional problems, a refrigerator according to the present invention includes a refrigerator main body having an inner box, an outer box, a heat insulating material provided between the inner box and the outer box, and the refrigerator main body. A refrigerating cycle having at least a condensing means, the condensing means comprising a portion in which a condensing pipe is in close contact with the heat insulating material side of the outer box, and the condensing means in the flow direction of the refrigerant in the refrigeration cycle At least a part of the pipe has a parallel path, and a flammable refrigerant is sealed in the refrigeration cycle, and the condensation pipe forming the parallel path is made smaller in diameter than the pipes before and after the branch pipe. By disposing the foam heat insulating material at a position where it does not intervene , deformation of the outer surface due to the foaming pressure of the foam heat insulating material is suppressed .

  As a result, the latent heat of condensation can be effectively used in each of a plurality of paths arranged in parallel, and by reducing the total volume of the radiating pipe by improving the radiating efficiency, the number of refrigerants can be reduced.

  The refrigerator of the present invention can provide a refrigerator in which operation efficiency is improved and energy saving is realized by improving heat dissipation efficiency.

The invention according to claim 1 includes a refrigerator body having an inner box, an outer box, a heat insulating material provided between the inner box and the outer box, and at least a condensing unit provided in the refrigerator body. A refrigerating cycle, wherein the condensing means includes a portion in which a condensing pipe is in close contact with the heat insulating material side of the outer box, and at least a part of the condensing means is a parallel path in the flow direction of the refrigerant in the refrigerating cycle. The refrigeration cycle is filled with a flammable refrigerant, and the condensation pipe forming the parallel path is made smaller in diameter than the pipes before and after the branch pipe, and the branch pipe is located at a position where no foam insulation is interposed. By suppressing the deformation of the outer surface due to the foaming pressure of the foam insulation, the pipe diameters of the plurality of paths arranged in parallel can be reduced, and the pipe length can be shortened. Heat dissipation Low refrigerant reduction is possible by reducing the total volume of the flop.

According to a second aspect of the present invention, in the first aspect of the present invention, the condensing means includes a first condensing pipe disposed in close contact with the heat insulating material side of the outer box, and a refrigerant flow direction in the refrigeration cycle. A second condensing pipe configured downstream of the first condensing pipe and in close contact with the heat insulating material side of the outer box, wherein the first condensing pipe or the second condensing pipe respectively flows the refrigerant in the refrigeration cycle. By having parallel paths in the direction, the latent heat of condensation can be effectively used in each of a plurality of paths arranged in parallel, and by reducing the total volume of the condensation pipe by improving the heat dissipation efficiency, it is possible to reduce the refrigerant. .

  In addition to the invention of claim 2, the invention of claim 3 is arranged in close contact with the outer box constituting the side surface or the back surface of the refrigerator main body, in addition to the invention of claim 2, By increasing the effective length of the first condensing pipe, which has high heat dissipation efficiency, it is possible to save energy by improving operating efficiency.

  In addition to the invention described in claim 2, the second condensing pipe is in close contact with the outer box forming the flange portion or the outer box forming the bottom surface on the front surface of the refrigerator body. By being arranged, it is possible to reduce the diameter of the second condensing pipe that exchanges heat by using a liquid layer or a highly wet refrigerant, and reducing the total volume of the second condensing pipe reduces the amount of refrigerant. Can be realized.

  According to a fifth aspect of the present invention, in addition to the second aspect of the invention, the first condensing pipe is disposed in close contact with an outer box constituting a side surface or a rear surface of the refrigerator main body, and the second The condensation pipe is disposed in close contact with the outer box constituting the flange portion or the bottom box constituting the bottom surface on the front surface of the refrigerator, thereby improving the heat dissipation efficiency of the first condensation pipe and the second condensation. By reducing the diameter of the pipe, the total volume of the condensing pipe can be reduced to reduce the refrigerant.

  According to a sixth aspect of the present invention, in addition to the invention according to any one of the first to fifth aspects, the parallel path is configured so that the flow path resistance of each path is substantially uniform. The refrigerant circulation amount becomes equal, and the heat radiation capacity can be maximized.

(Embodiment 1)
1 is a side view of a refrigerator according to Embodiment 1 of the present invention. FIG. 2 is a front view of the refrigerator according to Embodiment 1 of the present invention. FIG. 3 is a configuration diagram showing a refrigeration cycle of the refrigerator in the first embodiment of the present invention. FIG. 4 is a refrigerant flow diagram in the pipe of the condensing pipe of the refrigerator in the first embodiment of the present invention.

  1, 2, and 3, the refrigerator main body 100 has a heat insulating layer 100 b formed inside an outer box 100 a.

  Here, the outer box 100a is composed of a side wall 101, a front flange portion 102, a bottom wall 103, and a ceiling wall 104. A first machine room 104 is located near the upper rear surface of the refrigerator main body 100, and a lower rear surface is located nearby. A second machine chamber 105 is defined in the chamber.

  The compressor 110 is disposed in the first machine room, and a flammable refrigerant is sealed in the refrigeration cycle.

  The dip pipe 111 is laid inside the evaporating dish 111a disposed in the second machine room, and has the effect of evaporating the defrost water stored in the evaporating dish 111a. In the present embodiment, the inner diameter of the immersion pipe 111 is 3 mm.

  The blower 112 is disposed in the second machine room and has an effect of promoting evaporation of defrost water.

  The first condensing pipe 120 includes a heat radiating pipe 121 and a heat radiating pipe 122 which are fixed in close contact with the inside of the left and right walls 101 in a parallel path.

  As the heat radiating pipe 121 and the heat radiating pipe 122, it is desirable to use a copper pipe meandering several times. Here, the heat radiating pipe 121 and the heat radiating pipe 122 have symmetrical shapes, and have the same piping length. In the present embodiment, the inner diameters of the heat radiating pipe 121 and the heat radiating pipe 122 are 2 mm. This is by substantially equalizing the total cross-sectional area of the submerged pipe 111 and other connecting pipe 161 and the total of the cross-sectional areas of the radiating pipe 121 and the radiating pipe 122 after branching, and maintaining the refrigerant flow rate in the pipe. This is designed not to adversely affect the transport of refrigeration oil.

  The second condensing pipe 130 is composed of a heat radiating pipe 131 and a heat radiating pipe 132 fixed in close contact with the inside of the front flange 102, and mainly the outer surface of the front flange 102 due to the effect of the internal temperature of the refrigerator main body 100. It is installed for the purpose of preventing condensation from occurring.

  The heat radiating pipe 131 and the heat radiating pipe 132 are desirably copper pipes meandering so as to divide the front flange 102 into left and right. Here, the heat radiating pipe 131 and the heat radiating pipe 132 have symmetrical shapes and have the same piping length, and the heat radiating pipe 131 is connected to the heat radiating pipe 121 and the heat radiating pipe 132 is connected to the heat radiating pipe 122, respectively. In the present embodiment, the inner diameters of the heat radiating pipe 131 and the heat radiating pipe 132 are 2 mm.

  The decompression means 140 has a decompression effect by reducing the pipe diameter, and is disposed so as to exchange heat by partially joining the suction pipe 164 of the compressor 110.

  The evaporator 150 is disposed in the refrigerator main body 100 and mainly includes an evaporator 151 and a blower 152.

  Here, in the present embodiment, the pipe inner diameter of each part of the connection pipe 161 is 3 mm.

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the combustible refrigerant compressed by the compressor 110 becomes a high-temperature / high-pressure gas and is sent to the immersion pipe 111. Here, the refrigerant that has exchanged heat with the defrost water becomes a medium-temperature / high-pressure saturated gas, and is divided into the heat radiating pipe 121 and the heat radiating pipe 122 via the branch rod 162 arranged in the second machine chamber 105, respectively. After heat exchange with the outside air through the side wall 101, heat exchange with the outside air is performed through the front flange portion 102 by the heat radiating pipe 131 and the heat radiating pipe 132.

  Here, in FIG. 4, the 1st condensing pipe 120 performs heat exchange inside a saturation curve. That is, heat exchange is performed more efficiently by using the latent heat of condensation of the refrigerant.

  At this time, in part A in the drawing, the dryness of the refrigerant is high, and it is considered that the spray flow is generally called, so that the latent heat of condensation of the refrigerant can be effectively used.

  From the A part to the B part, the refrigerant flow is in a state called an annular spray flow, and the heat transfer efficiency gradually decreases due to the influence of the condensed refrigerant formed in an annular shape on the inner wall of the wall, and the weight flow rate flowing through the pipe is constant. As a result of phase change, that is, condensation, the flow velocity in the pipe also decreases as the volume flow rate decreases, and the heat transfer efficiency decreases.

  In the part B, the flow of the refrigerant is in a state of high wetness called slag flow and bubble flow, and the heat transfer efficiency is further lowered due to the influence of the condensed refrigerant and the decrease in the flow velocity in the pipe.

  Since C part is a liquid phase and is heat transfer by a sensible heat change, heat transfer efficiency falls remarkably compared with A part, B part, and C part mentioned above.

  Here, in FIG. 4, since the heat radiating pipe 121 and the heat radiating pipe 122 are mainly located from the A to the B part, the heat radiating pipe 121 and the heat radiating pipe 122 are closer to the A part than when the heat radiating pipe 121 and the heat radiating pipe 122 are arranged in series. By exchanging heat at a position where the heat transfer efficiency is high, it is possible to shorten the piping length necessary to secure the necessary heat dissipation amount.

  Furthermore, since the piping is made thinner, the total internal volume of the heat radiating pipe 121 and the heat radiating pipe 122 can be reduced, and a small refrigerant effect can be obtained.

  Furthermore, since the heat radiating pipe 131 and the heat radiating pipe 132 are mainly located from the B part to the C part, the ratio of the total refrigerant filling amount of the system is large and the pipes are reduced in diameter. The total internal volume of the heat radiating pipe 132 can be reduced, and a small refrigerant effect can be obtained.

  Here, by using parallel paths, the refrigerant flow rate in each path is branched and thus decreased.

  At this time, the necessary heat radiation amount of each path is also reduced according to the branching ratio. For example, when branching in a one-to-one manner, a half heat radiation amount may be ensured. Accordingly, assuming that the heat dissipation amount per unit length is constant, an equivalent heat dissipation amount can be ensured if the parallel path is formed with a length of one half.

  On the other hand, when heat is radiated by piping closely attached to the outer box 101, the heat radiating surface area is remarkably larger than the outer surface area of the piping and becomes a dominant factor. Therefore, the internal volume of the pipe can be reduced with the same capacity, and the refrigerant can be reduced.

  Next, the refrigerant exiting from the second condensing pipe 130 joins at the collecting wall 163 disposed in the first machine chamber 104, and then expands by the decompression means 140 to become a low-frequency / low-pressure saturated gas. The air is exchanged with the air in the refrigerator main body 100 and then sucked into the compressor 110.

  Here, the decompression means 140 has a decompression effect by narrowing the pipe diameter, and is disposed so as to be partly joined to the suction pipe 164 of the compressor 110 to perform heat exchange. The refrigerant sucked is in a medium temperature / low pressure gas state.

  As described above, the refrigerator according to the present embodiment includes the first condensing pipe 120 disposed in close contact with the side wall 101 of the refrigerator main body 100, and the front flange portion that is configured downstream of the first condensing pipe 120 in the refrigerant flow direction. By comprising a condensing means consisting of a second condensing pipe disposed in close contact with 102, the first condensing pipe 120 or the second condensing pipe 130 is constituted by a plurality of paths arranged in parallel, In the first condensing pipe 120, the effect of shortening the pipe length and reducing the pipe diameter by improving the heat transfer efficiency is obtained, and in the second condensing pipe 130, the effect of reducing the pipe diameter is obtained. Refrigerating is possible.

  Furthermore, since the first condensing pipe 120 is composed of a plurality of paths arranged in parallel, the condensing performance is improved at a certain pipe length due to the improved heat transfer efficiency, and an energy saving effect is obtained.

  Further, in the case of a pipe shape meandering up and down like the first condensing pipe 120, the pipe length becomes long, and when the number of turns increases, oil or refrigerant liquid stays in the lower turn part, and when the operation is stopped, the high pressure side and the low pressure It obstructs equal pressure between the sides. In addition, the refrigerant temporarily deficient at the time of start-up and had problems with durability such as an abnormal increase in the discharge temperature of the compressor 110. However, the first condensing pipe 120 has a long pipe length due to improved heat transfer efficiency. Shortening is possible and the reliability of the refrigeration cycle can be increased. In particular, in the specification such as the present embodiment in which the compressor 110 is disposed on the upper part of the refrigerator main body 100, oil return is important for reliability, and how to reduce the oil accumulation factor in the middle of the piping is an important issue. However, the shortening of the piping length can improve the reliability by reducing the number of turns.

  Furthermore, since the piping length of the first condensing pipe 120 can be shortened, the cost can be reduced.

  Furthermore, since the piping length of the first condensing pipe 120 can be shortened, the manufacturing workability of the piping can be improved.

  Further, when the branch rod 162 or the collective rod 163 is disposed in the wall and brought into close contact with the outer box 100a, the pipe is pressed against the outer box 101 by the foaming pressure when foaming urethane, so that the branch rod 162 having a different diameter is used. The collecting rod 163 causes deformation on the outer surface, but the branch rod 162 that branches the first condensing pipe 120 is disposed in the second machine chamber 105, and the collecting rod 163 that connects the second condensing pipe 130 is the first one. Since it is disposed in one machine room 104, deformation of the outer surface can be minimized.

  Further, when the branch rod 162 and the collecting rod 163 are arranged in the wall and brought into close contact with the outer box 100a, the outer surface is deformed, but the branch rod 162 that branches the first condensing pipe 120 is the second machine chamber. 105, and the collecting rod 163 for connecting the second condensing pipe 130 is provided in the first machine chamber 104. Therefore, the brazing operation performed when connecting the pipes is performed in the first machine chamber 104 or the first machine chamber 104, respectively. Since it can be performed in the two machine room 105, workability can be improved.

(Embodiment 2)
FIG. 5 is a side view of the refrigerator according to Embodiment 2 of the present invention. FIG. 6 is a front view of the refrigerator in the second embodiment of the present invention. FIG. 7 is a configuration diagram showing a refrigeration cycle of the refrigerator in the second embodiment of the present invention.

  5, 6, and 7, the freezer compartment 201 is formed at the lowest stage of the refrigerator main body 100 in the present embodiment.

  The second condensing pipe 230 is composed of a heat radiating pipe 231 fixed in close contact with the inside of the front flange 102 and a heat radiating pipe 232 fixed in close contact with the bottom wall 103. It is installed for the purpose of preventing condensation on the outer surface of the front flange 102 due to the temperature and preventing condensation on the bottom wall 103 due to the temperature inside the freezer compartment 201.

  The heat radiating pipe 231 meanders and is fixed tightly inside the front flange 102, and it is desirable to use a copper pipe.

  Next, the heat radiating pipe 232 meanders and is fixed in close contact with the inside of the bottom wall 103, and it is desirable to use a copper pipe.

  Here, the heat radiation pipe 231 and the heat radiation pipe 232 are set to have a pipe shape and a pipe length so that the pressure loss characteristics due to the pipe shape are substantially equal. Further, the heat radiating pipe 231 is connected to the heat radiating pipe 121, and the heat radiating pipe 232 is connected to the heat radiating pipe 122. In the present embodiment, the inner diameters of the heat radiating pipe 231 and the heat radiating pipe 232 are 2 mm.

  The decompression means 140 has a decompression effect by reducing the pipe diameter, and is disposed so as to exchange heat by partially joining the suction pipe 164 of the compressor 110.

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the combustible refrigerant compressed by the compressor 110 becomes a high-temperature / high-pressure gas and is sent to the immersion pipe 111. Here, the refrigerant that has exchanged heat with the defrost water becomes a medium-temperature / high-pressure saturated gas, and is divided into the heat radiating pipe 121 and the heat radiating pipe 122 via the branch rod 162 arranged in the second machine chamber 105, respectively. After exchanging heat with the outside air via the side wall 101, the heat radiating pipe 231 exchanges heat with the outside air via the front flange portion 102 and the heat radiating pipe 232 via the bottom wall 103.

  At this time, since the heat radiating pipe 231 and the heat radiating pipe 232 in FIG. 4 are mainly located from the B part to the C part, the ratio of the total refrigerant charging amount of the system is large, and the pipe is made thinner. The total internal volume of the heat radiating pipe 131 and the heat radiating pipe 132 can be reduced, and the effect of reducing the refrigerant can be obtained.

  Next, the refrigerant exiting from the second condensing pipe 130 joins at the collecting wall 163 disposed in the second machine chamber 105, and then expands by the decompression means 140 to become a low-frequency / low-pressure saturated gas. The air is exchanged with the air in the refrigerator main body 100 and then sucked into the compressor 110.

  Here, the decompression means 140 has a decompression effect by narrowing the pipe diameter, and is disposed so as to be partly joined to the suction pipe 164 of the compressor 110 to perform heat exchange. The refrigerant sucked is in a medium temperature / low pressure gas state.

  As described above, the refrigerator according to the present embodiment includes a front flange portion in a refrigerator in which a bottom wall 103 requires heat dissipating means for preventing condensation, such as a refrigerator in which a freezer compartment 201 is formed at the bottom of the refrigerator main body 100. By disposing the heat radiating pipe 231 on the 102 and the heat radiating pipe 232 on the bottom wall 103 to form a parallel circuit, the second condensing pipe 230 has an effect of reducing the diameter of the pipe. Refrigerating is possible.

(Embodiment 3)
FIG. 8 is a side view of the refrigerator according to Embodiment 3 of the present invention. FIG. 9 is a front view of the refrigerator according to Embodiment 3 of the present invention. FIG. 10 is a configuration diagram showing a refrigeration cycle of the refrigerator in the second embodiment of the present invention.

  8, 9, and 10, the second condensing pipe 330 includes a heat radiating pipe 331 and a bottom wall 103 that are fixed in close contact with the inside of the front flange 102, and is mainly inside the refrigerator main body 100. It is installed for the purpose of preventing condensation on the outer surface of the front flange 102 due to the influence of temperature.

  The heat radiating pipe 331 is meanderingly fixed inside the front flange 102 and is preferably a copper tube. In this embodiment, the inner diameter of the heat radiating pipe 331 is 3 mm.

  At this time, in FIG. 4, since the first condensing pipe 120 is mainly located from the A to the B part, the heat transfer efficiency closer to the A part can be obtained as compared with the case where the radiating pipe 121 and the radiating pipe 122 are arranged in series. By performing heat exchange at a high position, the heat dissipation performance is improved, and an energy saving effect is obtained.

  As described above, the refrigerator according to the present embodiment includes the first condensing pipe 120 disposed in close contact with the side wall 101 and the downstream side of the first condensing pipe 120 in the refrigerant flow direction. The first condensing pipe 120 is formed by a parallel path of the heat radiating pipe 121 and the heat radiating pipe 122, and the first condensing pipe 120 and the second condensing pipe 330 are connected by a serial path. As a result, the heat dissipation performance of the first condensing pipe 120 is improved, and an energy saving effect is obtained.

(Embodiment 4)
FIG. 11 is a side view of the refrigerator according to Embodiment 4 of the present invention. FIG. 12 is a front view of the refrigerator according to Embodiment 4 of the present invention. FIG. 13: is a block diagram which shows the refrigerating cycle of the refrigerator in Embodiment 4 of this invention.

  11, 12, and 13, the first condensing pipe 420 includes a heat radiating pipe 421 and a heat radiating pipe 422 that are fixed in close contact with the inside of the left and right walls 101 in a series path.

  As the heat radiating pipe 421 and the heat radiating pipe 422, it is desirable to use a copper pipe meandering several times. Here, the heat radiating pipe 121 and the heat radiating pipe 122 have symmetrical shapes, and have the same piping length. In the present embodiment, the inner diameters of the heat radiating pipe 121 and the heat radiating pipe 122 are set to φ3 mm.

  The second condensing pipe 430 includes a heat radiating pipe 431 and a heat radiating pipe 432 which are fixed in close contact with the inside of the front flange 102 in a parallel path. The front flange 102 is mainly affected by the temperature inside the refrigerator main body 100. It is installed for the purpose of preventing the condensation on the outer surface of the.

  The heat radiating pipe 431 and the heat radiating pipe 432 are preferably made of copper tubes meandering so that the front flange 102 is divided into left and right. Here, the heat radiating pipe 431 and the heat radiating pipe 432 are symmetrical in shape and have the same piping length. In the present embodiment, the inner diameters of the heat radiating pipe 131 and the heat radiating pipe 132 are 2 mm.

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the combustible refrigerant compressed by the compressor 110 becomes a high-temperature / high-pressure gas and is sent to the immersion pipe 111. Here, the refrigerant that has exchanged heat with the defrost water becomes a medium-temperature / high-pressure saturated gas, flows continuously from the heat radiating pipe 421 to the heat radiating pipe 422, and exchanges heat with the outside air through the side walls 101. Heat is exchanged with the outside air through the front flange portion 102 by the heat radiating pipe 431 and the heat radiating pipe 432 through the branch rod 162 disposed in the second machine chamber 105.

  Here, in FIG. 4, since the heat radiating pipe 431 and the heat radiating pipe 432 are mainly located from the B part to the C part, the ratio of the total refrigerant filling amount of the system is large, and the piping is made smaller in diameter. The total internal volume of the heat radiating pipe 131 and the heat radiating pipe 132 can be reduced, and the effect of reducing the refrigerant can be obtained.

  As described above, the refrigerator according to the present invention can reduce the refrigerant charge amount and improve the condensation capacity in the refrigerator having the condensation pipe closely attached to the outer box, so that it can be used for commercial refrigerators and vending machines. Applicable.

Side view of refrigerator in embodiment 1 of the present invention. Front view of the refrigerator in Embodiment 1 of the present invention The block diagram which shows the refrigerating cycle of the refrigerator in Embodiment 1 of this invention Refrigerant flow diagram in the condenser pipe of the refrigerator in Embodiment 1 of the present invention Side view of refrigerator in embodiment 2 of the present invention. Front view of the refrigerator in Embodiment 2 of the present invention The block diagram which shows the refrigerating cycle of the refrigerator in Embodiment 2 of this invention Side view of the refrigerator in Embodiment 3 of the present invention Front view of the refrigerator in Embodiment 3 of the present invention The block diagram which shows the refrigerating cycle of the refrigerator in Embodiment 3 of this invention. Side view of the refrigerator in Embodiment 4 of the present invention Front view of the refrigerator in Embodiment 4 of the present invention The block diagram which shows the refrigerating cycle of the refrigerator in Embodiment 4 of this invention (A) Schematic side sectional view of a conventional refrigerator (B) Rear perspective view of a conventional refrigerator The block diagram which shows the refrigerating cycle in the conventional refrigerator Main part enlarged schematic diagram showing the form of a conventional heat radiating pipe

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Refrigerator main body 101 Outer box 102 Front flange 103 Bottom face 120 1st condensing pipe 130 2nd condensing pipe 230 2nd condensing pipe 330 2nd condensing pipe 420 1st condensing pipe 430 2nd condensing pipe

Claims (6)

A refrigerator body having an inner box, an outer box, a heat insulating material provided between the inner box and the outer box, and a refrigeration cycle provided in the refrigerator body and provided with at least a condensing means, and the condensation The means includes a portion in which a condensation pipe is in close contact with the heat insulating material side of the outer box, and at least a part of the condensation means has a parallel path in the flow direction of the refrigerant in the refrigeration cycle. Encloses a combustible refrigerant, and the condensing pipes forming the parallel path have a smaller diameter than the pipes before and after the branch pipe, and the branch pipe is disposed at a position where the foam heat insulating material is not interposed. A refrigerator characterized by suppressing deformation of the outer surface due to the foaming pressure of .   The condensing means is configured in close contact with the heat insulating material side of the outer box, and is configured downstream of the first condensing pipe in the flow direction of the refrigerant in the refrigeration cycle and on the heat insulating material side of the outer box 2. The refrigerator according to claim 1, further comprising: a second condensing pipe closely attached to the first condensing pipe, wherein the first condensing pipe or the second condensing pipe has a parallel path in a flow direction of the refrigerant in the refrigeration cycle. .   The refrigerator according to claim 2, wherein the first condensing pipe is disposed in close contact with an outer box constituting a side surface or a back surface of the refrigerator main body.   The refrigerator according to claim 2, wherein the second condensing pipe is disposed in close contact with an outer box that forms a flange portion or an outer box that forms a bottom surface of the refrigerator main body.   The first condensing pipe is disposed in close contact with the outer box constituting the side or back of the refrigerator body, and the second condensing pipe constitutes the outer box or the bottom constituting the flange portion on the front of the refrigerator. The refrigerator according to claim 2 arranged in close contact with the outer box.   The refrigerator according to any one of claims 1 to 5, wherein the parallel path has a substantially uniform flow resistance in each path.

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