JP5165740B2 - Heat exchange device and cooling chamber using the same - Google Patents

Description

  The present invention relates to a heat exchange device through which a refrigerant passes and a refrigerator such as a refrigerator or a freezer using the heat exchange device.

  Many refrigerators such as refrigerators (freezers) have a compression refrigerator as a cooling device. Some of the vapor compression refrigerators include a capillary tube as a constrictor for reducing the flow rate of the refrigerant compressed by the compressor and liquefied by the condenser. The refrigerant is depressurized and vaporized in the capillary tube and flows into the evaporator. The low-temperature refrigerant exchanges heat with the air around the evaporator and cools the air around the evaporator. The refrigerant exiting the evaporator flows into the compressor through a suction pipe.

  In the compression refrigerator, in order to improve the efficiency of the refrigeration cycle, two capillary tubes having different resistances (inner diameter and / or different length) and a switching valve are provided, and the capillary tube is selected. The one with adjusted refrigeration capacity has been put to practical use. In the compression refrigerator, a joining member for inserting the two capillary tubes into a single pipe is used at a portion where the two capillary tubes join (for example, Japanese Patent No. 3076522). Gazette, utility model 3118033, JP 2009-168196 A, etc.).

  A high-temperature refrigerant flows through the capillary tube and a low-temperature refrigerant flows through the suction pipe, and the efficiency of the refrigeration cycle of the compression refrigerator can be increased by exchanging heat between the refrigerant flowing through the capillary pipe. It is. Moreover, there is also an effect of suppressing frost formation on the suction pipe by increasing the temperature of the refrigerant flowing through the suction pipe. Then, two capillary tubes are brought into contact with one suction pipe (see JP 2002-372319 A).

Japanese Patent No. 3076522 Utility Model No. 3118033 JP 2009-168196 A JP 2002-372319 A

  The capillary tube and the suction pipe need to have a certain contact length in order to enhance the heat exchange effect of the refrigerant flowing through the capillary tube and the suction pipe. Since the internal capacity of the refrigerator is large, it is not possible to make a large installation place for the compression refrigerator. Therefore, the capillary tube and the suction pipe are bent and meandered. Such bending of the capillary tube and the suction pipe is performed after the capillary tube and the suction pipe are fixed in contact with each other.

  In the case where two capillary tubes are in contact with the suction pipe as in the invention described in JP-A-2002-372319, depending on the bending direction of the capillary tube and the suction pipe, the capillary tube may be the suction pipe. The capillaries are easily squeezed and the capillary tube is crushed, making it difficult to process. In order to prevent such a problem from occurring, a method of bending and brazing the capillary tube and the suction pipe separately is conceivable. However, as the number of bending operations increases, the capillary tube and the suction pipe are increased. It is necessary to match the curvature of the bent part with the pipe with high accuracy, and processing takes time and effort.

  In the compression refrigerator, the capillary tube is joined to the inlet side piping of the evaporator and the piping on the suction pipe side. When the two capillary tubes as described above are provided, the two capillary tubes are used by using a confluence member as described in Japanese Patent No. 3076522, Japanese Utility Model No. 3118033, Japanese Patent Laid-Open No. 2009-168196, and the like. The number of parts is increased. Moreover, when using a confluence | merging member, it must braze at least 3 places (joint part of two capillary pipes and piping after a confluence | merging, and a confluence | merging member), and it takes time and effort for manufacture. In addition, it is necessary to provide a space in the cooler in order to attach the junction member, and it may be difficult to confirm the leakage of the refrigerant in the junction member depending on the place where the junction member is disposed.

  Therefore, the present invention is a heat exchange device having a structure in which two capillary tubes are connected to one evaporator, and suppresses an increase in the number of parts and an increase in processing man-hours, and a highly productive heat exchange device and this heat exchange device. It aims at providing the refrigerator using an exchange device.

  In order to achieve the above object, the present invention provides two pipes in which a low-temperature refrigerant flows, a low-temperature pipe bent at least at one place, and a high-temperature refrigerant flows inside, and is fixed in contact with the low-temperature pipe at least at an intermediate portion. The two high temperature pipes are arranged side by side in a direction crossing the bending direction of the low temperature pipe and symmetrical with respect to the low temperature pipe. And

  According to this configuration, when bending the low temperature pipe in a state where the two high temperature pipes are fixed in contact with the low temperature pipe, the curvature at the bent portion of the two high temperature pipes and the low temperature pipe is appropriately set. Since the adjustment can be performed, it is possible to reduce problems that the high-temperature pipe is disconnected, crushed, or embedded in the low-temperature pipe.

  In the above configuration, when the two high-temperature pipes are arranged at least in contact with and fixed in a direction perpendicular to the bending direction of the low-temperature pipe, the two high-temperature pipes and one low-temperature pipe Can be made the same, and the problem that the high-temperature pipe is disconnected, collapsed, or sunk into the low-temperature pipe can be most effectively suppressed.

  In the above configuration, the two high-temperature pipes are pipes having different inner diameters or lengths of the pipes.

  In the above configuration, the low-temperature pipe is a suction pipe that connects the evaporator and the compressor, and the two high-temperature pipes are capillary pipes disposed between the condenser and the evaporator, The two capillary tubes are pipes formed in parallel in the refrigerant circuit, and the two capillary tubes are collectively inserted into the inlet side pipe of the evaporator and fixed by brazing.

  According to this configuration, the two capillary tubes and the inlet-side piping can be brazed together by heating and pouring brazing, so that the time required for processing can be shortened. In addition, since the suction pipe and the capillary pipe are arranged close to each other, the suction pipe and the outlet side pipe, the capillary pipe and the inlet side pipe can be connected continuously, and the manufacturing time accordingly. Can be shortened.

  In the above configuration, both end portions of the two capillary tubes are separated from the suction pipe, and at least the end portions of the two capillary tubes that are inserted and fixed to the inlet side piping of the evaporator are Has been annealed.

  According to this configuration, since the degree of freedom in handling the two capillary tubes to the inlet side piping is increased, work efficiency is improved.

  The said structure WHEREIN: The pipe part of the inlet side piping of the said evaporator has a shape which can insert the said two capillary tubes side by side. According to this, the two capillary tubes can be combined and inserted into the inlet side piping, so that the work efficiency is increased.

  The said structure WHEREIN: The edge part inserted and fixed to the said inlet side piping of the said two capillary tubes is bundled with the fixing member. Examples of the fixing member include ring low, tape, and ribbon. Thus, by bundling the portion of the capillary tube to be inserted into the inlet side pipe and inserting it into the inlet side pipe, the tip is hard to be broken, and the capillary tube can be easily inserted into the inlet side pipe. Become. The ring row may be a circular shape surrounding the two capillary tubes, or a C shape having a part opened.

  The said structure WHEREIN: When the said evaporator is installed in the installation position, the pipe part of the said inlet side piping is a shape which can line up the said 2 capillary tube in a horizontal direction. According to this configuration, since a large gap is formed between the two capillary tubes and the inlet side pipe, it is easy to pour wax into the gap, and it is easy to check the degree of flow of the wax.

  In the upper structure, the opening at the tip of the pipe portion of the inlet side pipe is formed with a taper that opens outward toward the tip. At this time, as the taper, when the evaporator is installed at the installation location, the lower slope length may be longer than the other parts.

  According to the present invention, by connecting two capillary tubes to one evaporator, an increase in the number of parts and an increase in processing man-hours can be suppressed, and a highly productive heat exchange device and a refrigerator using this heat exchange device Can be provided.

It is the schematic of a compression refrigerator provided with the heat exchange apparatus concerning this invention, and a refrigerator. It is a perspective view of an example of an evaporator. It is a perspective view of the heat exchange pipe concerning this invention. It is sectional drawing of the heat exchange pipe shown in FIG. It is an expansion perspective view of V part of the evaporator shown in FIG. It is the perspective view seen from the arrow side of the inlet side piping of the evaporator shown in FIG. It is sectional drawing cut | disconnected in the direction in alignment with the axis | shaft of the inlet side piping shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a compression refrigerator and a refrigerator equipped with an evaporator according to the present invention. As shown in FIG. 1, the refrigerator includes a refrigerating room R1 that is a refrigerating area and a freezing room R2 that is a freezing area inside the heat insulating box. The refrigerator Rf is provided with a compression refrigerator A that cools the inside of the refrigerator compartment R1 and the freezer compartment R2. The compression refrigerator A includes a compressor 1, a condenser 2, a switching valve 3, and a heat exchange device, and is a refrigeration cycle in which a refrigerant is sealed. The heat exchange apparatus according to the present invention includes a first capillary tube 41, a second capillary tube 42, an evaporator 5, and a suction pipe 6.

  In the refrigerator Rf, the refrigerator compartment R1 and the freezer compartment R2 are partitioned by a heat insulator. A duct (not shown) for allowing air to flow between the refrigerator compartment R1 and the freezer compartment R2 is formed in the heat insulator that partitions the refrigerator compartment R1 and the refrigerator compartment R2. As will be described later, the evaporator 5 is disposed only in the freezer compartment R2, and the compression refrigerator A cools the freezer compartment R2. The refrigerator Rf is configured to cool the refrigerator compartment R1 by sending the cold air of the freezer compartment R2 to the refrigerator compartment R1 through a duct. A fan (not shown) for circulating the cold air exchanged with the evaporator 5 inside the freezer compartment R2 and a fan (not shown) for sending the cold air in the freezer compartment R2 to the refrigerator compartment R1 through a duct are attached. ing.

  First, the compression refrigerator A will be described. The compressor 1 is an electric motor that compresses the refrigerant and sends it to the condenser 2. The compressor 1 is arrange | positioned outside the heat insulation box of the refrigerator Rf. The condenser 2 cools and condenses the refrigerant sent from the compressor 1. In the compression refrigeration machine A, the condenser 2 is constituted by a pipe routed outside the heat insulation box of the refrigerator Rf, and discharges the heat of the refrigerant to the outside of the refrigerator Rf when passing through this pipe. To do. In addition, as a structure of the condenser 2, it is not limited to this, The thing using the air cooling type or water cooling type heat exchanger generally used well may be used. Further, the condenser 2 is made of a metal such as copper having a high thermal conductivity in order to increase the heat exchange efficiency. In addition, it is not limited to copper, A metal with high electroconductivity, such as aluminum (alloy), can be employ | adopted.

  The switching valve 3 is an electromagnetic valve for causing the refrigerant from the condenser 2 to flow to one or both of the first capillary tube 41 and the second capillary tube 42. The switching valve 3 is configured to perform a switching operation based on the internal temperature of the refrigerator compartment R1 and / or the freezer compartment R2, the rotational speed of the compressor 1, and the like. Similarly to the condenser 2, the switching valve 3 is also disposed outside the heat insulating box of the refrigerator Rf. The switching valve 3 also has a function of blocking the refrigerant flow to both the first capillary tube 41 and the second capillary tube 42. When the compressor 1 is stopped, the switching valve 3 is operated to suppress the refrigerant outflow from the condenser 2, thereby suppressing the decrease in the refrigerant pressure on the condenser 2 side and saving the compression refrigerator A It can be energized.

  The first capillary tube 41 and the second capillary tube 42 are copper tubes having an inner diameter smaller than the piping from the condenser 2, and are throttlers that reduce the pressure of the refrigerant from the condenser 2. The refrigerant exiting from the first capillary tube 41 or the second capillary tube 42 is diffused and evaporated. The first capillary tube 41 and the second capillary tube 42 have different inner diameters. As described above, the first capillary tube 41 and the second capillary tube 42 have different resistances because the inner diameters of the first capillary tube 41 and the second capillary tube 42 are different. In the compression refrigerator A, the resistance is adjusted by the difference in the inner diameter of the capillary tube. However, the resistance may be adjusted by the length using a tube having the same inner diameter, and the inner diameter and the length may be adjusted. It may be.

  The first capillary tube 41 and the second capillary tube 42 are combined and directly connected to the inlet side piping 51 of the evaporator 5. That is, the first capillary tube 41 and the second capillary tube 42 include the switching valve 3 disposed outside the heat insulation box and the evaporator 5 disposed inside the freezer compartment R2 (inside the heat insulation box). Is a pipe that connects to the heat insulation box. The refrigerant flowing through the first capillary tube 41 or the second capillary tube 42 has a high temperature, so that heat is not transferred to the refrigerator compartment R1 and the freezer compartment R2, and is not heated by the heat from the condenser 2. The portions other than the end connected to the switching valve 3 and the end connected to the evaporator 5 are arranged in a heat insulating portion which is a space formed inside the heat insulating layer of the heat insulating box.

  The evaporator 5 is a heat exchanger in which the refrigerant circulating inside exchanges heat with the outside air and cools the outside air, and is arranged inside the freezer compartment R2. FIG. 2 is a perspective view of an example of the evaporator. As shown in FIG. 2, the evaporator 5 includes a heat exchanging unit 50, an inlet side pipe 51 through which the refrigerant flows into the heat exchanging part 50, and an outlet side pipe 52 through which the refrigerant of the heat exchanging unit 50 is discharged. Yes. The heat exchange unit 50 includes meandering pipes and a plurality of fins that are arranged in parallel to each other and through which the pipes penetrate. In addition, piping has a linear part and a curved part, and the heat exchange part 50 has penetrated the fin in the linear part. The surface area of the heat exchange part 50 is increased by the fins, and the cooling effect by the refrigerant is enhanced.

  A suction pipe 6 is connected to the outlet side pipe 52 of the evaporator 5. The suction pipe 6 is a pipe connecting the evaporator 5 and the compressor 1. Heat exchange is performed between the refrigerant flowing through the suction pipe 6 and the refrigerant flowing through the first capillary tube 41 and the second capillary tube 42. The suction pipe 6 performs heat exchange between the refrigerant flowing in the interior and the refrigerant flowing in the first capillary tube 41 or the second capillary tube 42, so that a metal having high thermal conductivity such as copper and aluminum (here, Copper pipe). The suction pipe 6 is also disposed in a heat insulating portion formed in a heat insulating box like the first capillary tube 41 and the second capillary tube 42. In the part from the heat insulation part of the suction pipe 6 to the compressor 1, it arrange | positions outside the heat insulation layer of a heat insulation box. Since the refrigerant flowing through the suction pipe 6 is heated by exchanging heat with the refrigerant flowing through the first capillary tube 41 or the second capillary tube 42, the suction pipe 6 is also heated and disposed outside the heat insulating layer of the suction pipe 6. It can suppress that frost and dew adhere to the part which is.

  Next, the operation of the compression refrigerator will be described. The refrigerant is compressed by the compressor 1, becomes high-temperature / high-pressure refrigerant gas, and flows into the condenser 2. The high-temperature and high-pressure refrigerant gas is condensed and liquefied by exchanging heat with external air when flowing inside the condenser 2. The condensed and liquefied refrigerant flows into either the first capillary tube 41 or the second capillary tube 42 when the switching valve 3 is switched.

  The refrigerant is decompressed by the first capillary tube 41 or the second capillary tube 42. The first capillary tube 41 and the second capillary tube 42 have different resistances, so that either the first capillary tube 41 or the second capillary tube 42 is selected depending on the number of rotations of the compressor 1. It has become. It is also possible to adjust the evaporation temperature of the refrigerant in the evaporator 5 by selecting the first capillary tube 41 or the second capillary tube 42 without changing the rotational speed of the compressor 1. Further, since the first capillary tube 41 and the second capillary tube 42 are in contact with the suction pipe 6 through which the low-temperature refrigerant flows, the high-temperature refrigerant flowing through the first capillary tube 41 or the second capillary tube 42 is cooled. Thereby, the cooling power in the evaporator 5 can be increased.

  The refrigerant depressurized by the first capillary tube 41 or the second capillary tube 42 flows into the evaporator 5 in a low temperature and low pressure state. The first capillary tube 41 and the second capillary tube 42 are connected to the inlet side pipe 51 of the evaporator 5, and the refrigerant that has passed through either the first capillary pipe 41 or the second capillary pipe 42 is the inlet side pipe 51. To the evaporator 5.

  The refrigerant flowing into the evaporator 5 is vaporized due to an abrupt pressure difference. As the refrigerant evaporates, it flows through the heat exchange section 50 of the evaporator 5 as a low-temperature refrigerant gas. At this time, when circulating through the heat exchanging unit 50, heat is exchanged with the air inside the freezer compartment R2, and the freezer compartment R2 is cooled. The refrigerant flowing through the heat exchanging section 50 increases its temperature by heat exchange and flows into the suction pipe 6 from the outlet side pipe 52. The suction pipe 6 is in contact with the first capillary tube 41 and the second capillary tube 42, and the low-temperature refrigerant flowing through the suction pipe 6 is heated with the high-temperature refrigerant flowing through the first capillary tube 41 or the second capillary tube 42. By exchanging, it is heated and becomes an appropriate refrigerant gas, which is sucked into the compressor 1.

  The suction pipe 6 is a pipe that connects the outlet side pipe 52 of the evaporator 5 arranged inside the freezer compartment R2 (heat insulation box) and the compressor 1 arranged outside the heat insulation box. Cross the thermal insulation layer of the body. As will be described later, heat exchange is performed between the refrigerant flowing through the suction pipe 6 and the refrigerant flowing through the first capillary tube 41 or the second capillary tube 42.

  Therefore, the suction pipe 6 is arrange | positioned so that the 1st capillary tube 41 and the 2nd capillary tube 42 may contact in the inside of a heat insulation part. The first capillary tube 41, the second capillary tube 42, and the suction pipe 6 are bonded and fixed so that heat exchange is possible on the surface, and constitutes a heat exchange pipe Hp. In addition, it is preferable that the suction pipe 6 is formed with metal (here copper pipe) with high heat conductivity, such as copper and aluminum. Further, as a method of fixing the first capillary tube 41 and the second capillary tube 42 and the suction pipe 6, a method of fixing by soldering can be employed. In addition to this, it is possible to widely employ a fixing method that is less harmful to the first capillary tube 41, the second capillary tube 42, and the suction pipe 6.

  Next, the heat exchange pipe which is the principal part of this invention is demonstrated with reference to drawings. 3 is a plan view of the heat exchange pipe according to the present invention, and FIG. 4 is a cross-sectional view of the heat exchange pipe shown in FIG. As shown in FIG. 4, the heat exchange pipe Hp is in contact with the first capillary tube 41 and the second capillary tube 42 and the outer peripheral surface of the suction pipe 6. The first capillary tube 41 and the second capillary tube 42 are tubes having an outer diameter and an inner diameter smaller than that of the suction pipe 6.

  More specifically, the first capillary tube 41 and the second capillary tube 42 have one end connected to the switching valve 3 and the other end connected to the inlet side pipe 51 of the evaporator 5. The suction pipe 6 has one end connected to the compressor 1 and the other end connected to the outlet side pipe 52 of the evaporator 5. For this reason, in the heat exchange pipe Hp, the intermediate part of the first capillary tube 41 and the second capillary tube 42 and the intermediate part of the suction pipe 6 are arranged inside the heat insulating part and are fixed in contact by brazing. ing. In other words, both end portions of the first capillary tube 41 and the second capillary tube 42 are formed separately from the suction pipe 6.

  In the heat exchange pipe Hp, the first capillary pipe 41 and the second capillary pipe 42 and the suction pipe 6 are in contact with each other, and the high-temperature refrigerant and the suction pipe flowing through the first capillary pipe 41 or the second capillary pipe 42 are used. Heat exchange is performed with the low-temperature refrigerant flowing through the refrigerant 6. That is, the refrigerant flowing through the first capillary tube 41 or the second capillary tube 42 is cooled, the evaporation temperature when evaporating in the evaporator 5 is lowered, and the cycle efficiency of the compression refrigerator is increased. Conversely, the low-temperature refrigerant flowing through the suction pipe 6 is heated by exchanging heat with the high-temperature refrigerant flowing through the first capillary tube 41 or the second capillary tube 42, and becomes a refrigerant gas having a temperature suitable for operation. It is sucked into the compressor 1. In addition, the portion of the suction pipe 6 that is close to the connection portion to the compressor 1 is disposed outside the heat insulating portion, but moisture in the air adheres to the surface of the suction pipe 6 as frost because the refrigerant is warmed. Hateful.

  However, if the length of the contact portion between the first capillary tube 41 and the second capillary tube 42 and the suction pipe 6 is short, the amount of heat exchange is small and the above effect is small. Therefore, in the heat exchange pipe Hp, the contact-fixed portions of the first capillary tube 41 and the second capillary tube 42 and the suction pipe 6 meander, and the first capillary tube 41 and the second capillary tube 42 and the suction pipe are meandered. The contact length with 6 is increased.

  In this way, the amount of heat exchange between the refrigerant flowing through the first capillary tube 41 or the second capillary tube 42 and the refrigerant flowing through the suction pipe 6 is increased. By increasing the amount of heat exchange, the above-described effects can be increased. The heat exchange pipe Hp has a shape bent at two places, but is not limited to this, and the number and shape of the bend are appropriately designed according to the installation location of the heat exchange pipe Hp. .

  The heat exchange pipe Hp is manufactured by bending with the suction pipe 6 and the first capillary tube 41 and the second capillary tube 42 fixed. At this time, if the curvatures of the suction pipe 6 and the first capillary tube 41 and the second capillary tube 42 are different from each other, the first capillary tube 41 and / or the second capillary tube 42 may be crushed or the first capillary tube 41 may be crushed. In addition, the second capillary tube 42 may sink into the suction pipe 6, or the first capillary tube 41 and / or the second capillary tube 42 and the suction pipe 6 may be separated. Therefore, as shown in FIG. 4, the heat exchange pipe Hp is a line that intersects with the bending direction of the suction pipe 6, and is symmetric with respect to the center of the suction pipe 6. 42 is attached.

  Thus, when bending is performed with the first capillary tube 41 and the second capillary tube 42 attached to the suction pipe 6, the bent portions of the first capillary tube 41, the second capillary tube 42, and the suction pipe 6 are processed. The curvature is the same or substantially the same. As a result, the first capillary tube 41 and the second capillary tube 42 are unlikely to be displaced due to the bending of the suction pipe 6, and the first capillary tube 41 and the second capillary tube 42 are crushed or incapacitated into the suction pipe 6. Hard to occur. For this reason, the first capillary tube 41 and the second capillary tube 42 are attached to the suction pipe 6 so that their centers are on a line substantially perpendicular to the bending direction of the suction pipe 6.

  In addition, when the curvature of the suction pipe 6 and the 1st capillary tube 41 and the 2nd capillary tube 42 corresponds, a deformation | transformation difference does not generate | occur | produce. For this reason, it is preferable that the first capillary tube 41 and the second capillary tube 42 are arranged so that their centers are located on a line orthogonal to the bending direction of the suction pipe 6. In addition, as a method of bending a tube body in which a plurality of tubes are bonded together, a bending method in which a tube is pushed and bent by a plurality of rollers can be exemplified, but the method is not limited to this, and the tube body is crushed. It is possible to widely adopt a processing method that can be bent so as not to be embedded.

  The first capillary tube 41 and the second capillary tube 42 and the suction pipe 6 are connected to different pipes (inlet side pipe 51 and outlet side pipe 52) at different positions. And the part isolate | separated from the suction pipe 6 of the 1st capillary tube 41 and the 2nd capillary tube 42 is heat-processed (annealing), and can deform | transform.

  Since the tips of the first capillary tube 41 and the second capillary tube 42 can be deformed, they can be gathered at a position away from the suction pipe 6 as necessary. Further, it is possible to route the combined first capillary tube 41 and second capillary tube 42 within a reachable range. On the other hand, the suction pipe 6 is hard and is not easily deformed because it is not heat-treated. Further, the portions of the first capillary tube 41 and the second capillary tube 42 which are in contact with the suction pipe 6 are not heat-treated and are hard.

  Next, attachment of the evaporator 5 to the freezer compartment R2 will be described. In the refrigerator Rf, before the evaporator 5 is attached to the freezer compartment R2, the heat exchange pipe Hp is attached inside the heat insulating portion of the heat insulating box. At this time, the first capillary tube 41 and the second capillary tube 42 and the end of the suction pipe 6 on the evaporator 5 side are drawn into the freezer compartment R2 through an opening (not shown). As described above, the tip portion of the suction pipe 6 is not easily deformed, and the tip portions of the first capillary tube 41 and the second capillary tube 42 are deformable.

  Therefore, the evaporator 5 is arranged in the cooling chamber R2 so that the suction pipe 6 penetrates the outlet side pipe 52. The evaporator 5 is fixed inside the freezer compartment R2 of the refrigerator Rf in a state where the suction pipe 6 is inserted into the outlet side pipe 52. Thereafter, the first capillary tube 41 and the second capillary tube 42 are put together and inserted into the inlet side piping 51 of the evaporator 5. The first capillary tube 41 and the second capillary tube 42 and the inlet side pipe 51 and the suction pipe 6 and the outlet side pipe 52 are fixed by pouring wax into the gap and brazing.

  The brazing of the first capillary tube 41 and the second capillary tube 42 and the inlet side piping 51 will be described with reference to the drawings. FIG. 5 is an enlarged perspective view of the V portion of the evaporator shown in FIG. 2, and FIG. 6 is a perspective view of the inlet side piping of the evaporator shown in FIG.

  The evaporator 5 in which the suction pipe 6 is inserted into the outlet side pipe 52 is fixed inside the cooling chamber R2. Thereafter, the first capillary tube 41 and the second capillary tube 42 are put together and inserted into the inlet-side piping 51 together. When the first capillary tube 41 and the second capillary tube 42 are twisted or pulled when they are routed when inserted into the inlet side tube 51, the tips of the first capillary tube 41 and the second capillary tube 42 are separated. May end up. When the tip is separated, it is difficult to insert into the inlet side pipe 51.

  Therefore, as shown in FIG. 5, the first capillary tube 41 and the second capillary tube 42 are bundled together by the ring row 43 before being inserted into the inlet side pipe 51. By bundling with the ring low 43, it is suppressed that the front-end | tip of the 1st capillary tube 41 and the 2nd capillary tube 42 separates. From this, it is possible to insert the first capillary tube 41 and the second capillary tube 42 exactly into the inlet side piping 51. The ring row 43 may be of a helically twisted configuration as shown in FIG. 5, and is formed by joining the end portions like the ring row 44, and partially like the ring row 45. May be a C-shaped one having an opening. The ring rows 43, 44, and 45 are made of the same copper as the first capillary tube 41 and the second capillary tube 42, but the present invention is not limited to this, and the first capillary tube 41 and the second capillary tube are not limited thereto. The tube 42 may be tightly bundled. Moreover, it may be bundled using a tape or the like instead of ring low.

  Next, the inlet side piping 51 will be described in detail. A first capillary tube 41 and a second capillary tube 42 are inserted into the inlet side pipe 51 together. Therefore, as shown in FIG. 6, the shape of the opening 510 of the inlet side pipe 51 is an ellipse. The oval shape of the opening 510 is large enough to allow the first capillary tube 41 and the second capillary tube 42 to slide on the inner wall of the inlet side tube 51 when the first capillary tube 41 and the second capillary tube 42 are inserted in a bundle. It has thickness and shape.

  As shown in FIGS. 2, 5, 6, and the like, the opening 510 of the inlet side pipe 51 has an oval shape in which the first capillary tube 41 and the second capillary tube 42 are arranged in the left and right (backward direction). ing. In order to smoothly insert the bundled first capillary tube 41 and second capillary tube 42 into the opening 510, a tapered portion 511 that opens outward is formed in the opening 510 of the inlet side pipe 51 as shown in FIG. Has been. By forming the tapered portion 511, the tips of the bundled first capillary tube 41 and second capillary tube 42 are guided to the center of the opening 510 by the taper 511. Thereby, workability | operativity which inserts the bundled 1st capillary tube 41 and the 2nd capillary tube 42 in the inlet side piping 51 becomes high.

  In the refrigerator Rf, the normal low-temperature freezer compartment R2 is formed below the refrigerator compartment R1, and the evaporator 5 is disposed in the freezer compartment R2. When manufacturing such a refrigerator Rf, an operator often accesses the evaporator 5 from information. In this case, the first capillary tube 41 and the second capillary tube 42 bundled by the operator are often inserted into the opening 510 of the inlet side pipe 51 in an angled state from the upper side. Even in this case, since the tapered portion 11 is formed in the opening 510 of the inlet side pipe 51, the bundled first capillary tube 41 and second capillary tube 42 can be easily inserted into the opening 510. , Workability becomes high.

  After the first capillary tube 41 and the second capillary tube 42 are inserted into the inlet tube 51, the inlet tube 51, the first capillary tube 41 and the second capillary tube 42 are heated, and the inlet tube 51 and the first capillary tube are heated. The molten solder is poured into a gap between the first capillary tube 41 and the second capillary tube 42 to braze. The wax flows into the gap between the contact portion of the first capillary tube 41 and the second capillary tube 42 and the inlet-side piping 51. Thereafter, due to capillary action, the inlet side penetrates into the gap between the tube 51 and the first capillary tube 41 and the gap between the second capillary tube 42. Since the tapered portion 511 is formed in the inlet side pipe 51, the melted wax tends to accumulate in the tapered portion, and the brazing operation itself becomes easy.

  Further, since the first capillary tube 41 and the second capillary tube 42 are inserted side by side into the inlet-side piping 51, the first capillary tube 41 and the second capillary tube through which molten wax flows during brazing. The gap between the contact portion 42 and the inlet side pipe 51 is formed vertically, and the molten wax is poured into the gap, so that the operation is easy. Further, the operator confirms that the wax has flowed into the gap between the contact portion of the first capillary tube 41 and the second capillary tube 42 and the inlet tube 51, so that the inlet tube 51 and the first capillary tube 51 are connected to the first capillary tube 41. It is checked whether the capillary tube 41 and the second capillary tube 42 are firmly fixed. Since the gap between the contact portion of the first capillary tube 41 and the second capillary tube 42 and the inlet-side piping 51 is formed vertically, confirmation can be easily performed.

  In the refrigerator Rf, the evaporator 5 is disposed close to the wall portion of the freezer compartment R2. For this reason, it is difficult to use a torch that is easy to uniformly heat the entire inlet side pipe 51, first capillary tube 41, and second capillary tube 42. Therefore, a method of heating using an induction heating device that does not ignite is employed. In the induction heating device, a coil is brought close to the inlet side pipe 51 to perform heating by induction.

  In the above-described embodiment, the tapered portion 511 formed in the opening 510 of the inlet side pipe 51 is formed so as to have an inclined surface having the same length over the entire circumference of the opening 510. However, the present invention is not limited to this, and as shown in FIG. 7, when the evaporator 5 is disposed inside the refrigerator Rf, the tapered portion 512 whose lower slope is longer than the other portions is provided. It may be formed. FIG. 7 is a cross-sectional view of the inlet side pipe used in the heat exchange apparatus according to the present invention. Thus, by forming the lower tapered portion 512 large, the operation of inserting the bundled first capillary tube 41 and the second capillary tube 42 into those having the tapered portion 511 of the same size is performed. It becomes easy. Further, since the lower slope becomes larger, the gap between the contact portion between the first capillary tube 41 and the second capillary tube 42 and the inlet-side piping 51 becomes larger, and the amount of wax accumulated in the tapered portion 512 increases. Thereby, the clearance gap between the 1st capillary tube 41, the 2nd capillary tube 42, and the inlet side piping 51 can be filled reliably.

  According to the heat exchange device of the present invention, the brazing joint between the capillary tube and the inlet side pipe or the suction pipe and the outlet side pipe is performed after the evaporator is disposed in the freezer compartment, so that the brazed portion is placed inside the freezer compartment. Has been placed. Thereby, after the refrigerator is assembled, when the refrigerant is filled and inspected, it is easy to confirm the refrigerant leakage at the joint portion, and the effect of easily correcting the refrigerant leakage is also achieved. Thereby, in the refrigerator of this invention, while being able to raise a yield, repair and a maintenance can also be performed easily.

  In the above description, the joining method called brazing uses silver-free phosphorous copper brazing (BCuP-2: JIS), which has high permeability (fluidity) at the time of melting. In addition, although a suction pipe and two capillary tubes are described as an example as one thick pipe and two thin tubes disposed along the thick pipe, the present invention is not limited to this.

  The heat exchange device according to the present invention can be used as a cooling device for cooling the inside by heat exchange from a condenser to a compressor in a compression refrigeration apparatus.

Claims (8)

Connecting the evaporator and the compressor, a suction pipe through which refrigerant Rutotomoni cold at least one location is bent,
The condenser and the evaporator are connected, arranged in a direction crossing the bending direction of the suction pipe and symmetrically with the low-temperature pipe interposed therebetween, and at least on the surface of the intermediate portion by brazing with the suction pipe And two capillary tubes that are fixed in contact and in which a high-temperature refrigerant flows ,
The pipe part of the inlet side pipe of the evaporator has a shape that allows the two capillary tubes to be inserted horizontally and fixed by brazing,
When the opening at the tip of the pipe part of the inlet side pipe of the evaporator is arranged so that a gap between the contact part of the two capillary pipes and the pipe part is formed vertically, toward the tip A heat exchanging device characterized in that a taper is formed which is open to the outside and has a lower slope length longer than other portions . 2. The heat exchange device according to claim 1, wherein at least a portion where the two capillary tubes are fixed in contact with each other is disposed in a direction orthogonal to a bending direction of the suction pipe . The heat exchange device according to claim 1 or 2, wherein the two capillary tubes are pipes having different inner diameters or lengths of the tubes.   Both ends of the two capillary tubes are separated from the suction pipe,
  4. The heat exchange device according to claim 1, wherein at least an end portion of the two capillary tubes on the side inserted and fixed to the inlet side pipe of the evaporator is annealed. 5. 5. The heat exchange device according to claim 1, wherein ends of the two capillary tubes inserted and fixed in the evaporator are bundled by a fixing member. The heat exchange device according to claim 5, wherein the fixing member is a ring row. A suction pipe connecting the evaporator and the compressor, wherein at least one portion is bent and a low-temperature refrigerant flows;
  The condenser and the evaporator are connected, arranged in a direction crossing the bending direction of the suction pipe and symmetrically with the low-temperature pipe interposed therebetween, and at least on the surface of the intermediate portion by brazing with the suction pipe And two capillary tubes that are fixed in contact and in which a high-temperature refrigerant flows,
  The pipe part of the inlet side pipe of the evaporator has a shape that allows the two capillary tubes to be inserted horizontally and fixed by brazing,
  The ends of the two capillary tubes that are inserted and fixed to the inlet side piping of the evaporator are annealed,
  An end portion of the two capillary tubes inserted and fixed in the evaporator is bundled by a ring row. The refrigerator provided with the heat exchange apparatus in any one of Claims 1-7.

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