TW542892B - Heat exchanger and refrigerator provided therewith - Google Patents

Abstract

A heat exchanger with high heat exchange efficiency and a refrigerator employing such a heat exchanger are provided. The refrigerator has a Stirling cycle refrigerator (6) and a heat exchanger (10) kept in contact with the cold head (62) thereof. This heat exchanger has a base (101), a fin (102) formed to protrude from the base, and a heat pipe (13) fitted on the surface of the base. The heat of the portion of the base other than the contact portion in which it is kept in contact with the cold portion is conducted through the heat pipe to the contact portion. The base may have a hollow portion formed therein, with the hollow portion filled with a refrigerant, so that the base itself functions as the heat pipe.

Description

542892 A7 B7

5. Description of the invention (1) TECHNICAL FIELD The present invention relates to a cooling system for cooling air produced by a similar Stirling cycle freezer, and to a refrigerator having a similar heat exchanger. BACKGROUND OF THE INVENTION / Stomach

Traditionally, cooling devices used in refrigerators and similar products have utilized the cooling cycle of gasification compression. Similar to ice-cooling devices, chlorofluorocarbons (CFCs) or chlorochlorocarbons substitutes are commonly used. In any case, similar refrigerants are known to have destructive effects on the global environment, such as damaging the ozone layer and causing the global greenhouse effect. Therefore, the use of delta devices has been banned for this reason. For this reason, technology must be used to replace the gasification compression cooling cycle. Research and development in the Stirling cycle refrigerator, _ a kind of cooling device uses the reversible Stirling cycle. Stirling cycle freezers use inert gas like gas or nitrogen as the working medium, which produces low temperatures without harming the global environment. In particular, it uses a closed cycle, and the working medium in the cylinder is the piston and the heat rejection block. It repeatedly compresses and expands through the action of external force, so it achieves the functions of heat exhaustion and heat absorption. In a refrigerator using a Stirling cycle freezer, the low-temperature part (cold end) of the Stirling cycle cooler is absorbed by the air inside the freezer as a result of the working medium expanding through a low-temperature side heat exchanger. , To achieve cooling inside the cold room. At the same time, the high-temperature part (hot end) of the 'Stirling cycle cold camera' is exhausted to the air on the outside of the freezer through the compression of the working medium through a high-temperature side heat exchanger. In any case, the Stirling cycle refrigerator has the following disadvantages. In contrast to the cooling cycle of the traditional cooling unit which uses gasification compression, the Stirling cycle cold roller does not use the heat storage of the working medium. Therefore, the heat conduction area of the cold and hot ends-4 542 892 A7 B7 Five invention description (: To achieve the refrigeration performance of the hundreds of watts required by the refrigerator is too small, which makes it unavoidable to increase the Stirling In order to overcome this problem, Japanese Patent Laid-Open Application No. H7-18〇921 discloses a structure that helps increase the efficiency of absorbing heat at the cold end. In particular, as shown in Figure 7 In the Stirling cycle refrigerator 6, the reference numeral indicates a cylinder, and the reference numeral 21 indicates a power piston. The reference numeral 22 indicates a row of heat block pistons, and the reference numeral 23 indicates a reciprocating mechanism for generating reciprocating movement of the piston 21 and the piston 22 under a predetermined phase difference. The reciprocating mechanism 23 is composed of a rotating element 231 and is driven by The motor (not shown in the figure) and the piston circles 232 and 233 are driven to rotate. Inside the cylinder 20, the composition of the compression space 20a and the expansion space 20b can be used for cold air storage. Each of the units 24 communicates with each other, thus forming a closed circuit. The working space inside the closed circuit is filled with a working medium like helium or krypton nitrogen. The function of the compression space 20a at the end of the side of the cylinder 2o It has the same function as the hot end 6 1 'cylinder 20 side side end expansion space 20b. It has the same function as the cold end 62. At the hot end 61, it has a high-temperature side heat exchanger 7. The cooling effect on the indoor side is as follows: The method is completed. The low-temperature side hot-fork converter heat transfer tube 13 is configured to extend from the cold end 62 into the freezing chamber. The heat transfer tube 13 is placed in the cold air duct 9 and has fins 102. At the cold end 62 The generated cold air is transmitted to the inside of the freezing room through the refrigerant filled with the heat transfer pipe 13, and is supplied to the air inside the cold room through the finned heat exchanger. Inside the cold air duct 9, a cold air fan u This paper size is applicable to China National Standard (CNS) A4 (21〇X 297mm)

Binding

Line 542892 A7 B7 V. Description of the invention (3) The circulation of air flow is generated inside the freezer compartment, so the supplied cold air will cool the inside of the freezer compartment and drop to a predetermined temperature. It should be noted that in the existing characteristics, cold air represents negative heat, which is done after absorbing its heat. In any case, in the structure disclosed in the aforementioned Japanese Patent Laid-Open Application No. H7-180921, all the amount of chilled air extracted by the cold end 62 can reach several hundreds of watts, which needs to be transmitted through the heat pipe 13. Therefore, a necessary temperature difference is required between the low temperature portion (that is, the tail end of the upstream side of the heat transfer tube 13) and the high temperature portion (that is, the tail end of the downstream side of the heat transfer tube 13). In any case, this will lead to temperature loss. To compensate for this, the cold end 62 needs to be kept at a lower temperature than that required inside the freezer. This will reduce the overall efficiency of the refrigeration system. In addition, it is necessary not only to provide a fin 102 for exchanging heat with the flowing air inside the cold air duct 9 at the high temperature end of the heat transfer tube 13 but also to provide another one at the low temperature end of the heat transfer tube 13 for the cold end. 62 heat exchanger for extracting cold air (not shown in the figure). These two types of heat exchangers cause improper structural complexity. SUMMARY OF THE INVENTION An object of the present invention is to provide a heat exchanger that can efficiently extract cold air without having a simple structure, and to provide a refrigerator having a similar heat exchanger. An object according to the present invention will complete the above object. A heat exchanger has a plate-shaped base and fins attached to the surface of the base. Some of the bases are applied in the same manner as the cooled part cooled from the outside and at least part of the fins Shape sheet-6- This paper size is in accordance with Chinese National Standard (CNS) A4 (210X297mm) 542892 A7 ____ B7 V. Description of the invention (4) ~ " 'It is located outside the cooled part of the base and has a built-in medium The heat transfer mechanism changes between gaseous and liquid depending on the temperature. This heat transfer mechanism uses the gasification and condensation cycles of the medium to move the heat outside the cooled part of the base toward the cooled part. Here The heat exchanger is located on the outside of the cooled base of the base, and the heat is transferred toward the cooled part (that is, the cold air is transmitted in the reverse direction), not only through simple heat transfer (depending on the temperature gradient), but also by using Latent heat completes the phase change of the medium. This allows the base to be effectively cooled in addition to the part being cooled (directly cooled from the outside), so it can be used. The chip is effectively cooled as a whole. Here, the heat transfer mechanism may be a pipe diameter, which has a sealing medium therein and is connected to the base. This pipe diameter functions like a so-called heat pipe, and it is simply connected to heat conduction. The tube (which is a separate component) can complete the heat exchanger as described above. In this way, the base may have a groove formed therein, so the pipe diameter is arranged in the groove formed on the surface of the base. The structure can make the contact area between the heat pipe and the base larger, and also make the distance between the surface of the base (the fins are fitted here) and the heat pipe shorter, which helps the fins The shaped piece has a high cooling efficiency. In another embodiment, the base may have a hollow portion formed therein to fill the inside of the base, so the base itself acts as a heat transfer mechanism. This structure can make the medium and the base Keep the contact in a large area, and in addition, the distance between the surface of the base (the fin is fitted here) and the inner surface of the base (the medium keeps contacting here) can be shortened, which helps the fins The chip has a Chinese standard (CNS) A4 specification (210X 297 mm) 542892 A7 B7 which is larger than the paper size. 5. Description of the invention (5) High cooling efficiency. In actual use, the preferred configuration is as described above. The heat exchanger, so the base part that transfers heat to the cooled part by the heat transfer mechanism is kept at a lower position than the cooled part. The heat exchanger in this way can make the medium condense at a higher position and lower The gasification of the position helps to promote the circulation of the medium. According to another aspect of the present invention, a cooling system has a storage chamber for storing objects, air flows back from the storage chamber side to the inside of the storage chamber via a circulation path, and A cooling device has a heat exchanger as described above for cooling the air flowing through the circulation path. Therefore, the heat exchanger has fins arranged in the circulation path, and the cooling device is kept in contact with the part to be cooled, so it is used for Cool the cooled part. In this cooling system, the air is effectively cooled after passing through the circulation path, so the storage chamber is effectively cooled. The storage compartment can be used like a refrigerated compartment, and the temperature can be kept to prevent water from freezing, and the same freezing compartment can be kept from the temperature to cause water to freeze. According to another aspect of the present invention, a heat exchanger has a contact portion that keeps contact with the cold end of a Stirling cycle refrigerator, and a fin configuration, which can promote heat exchange at a point away from the contact portion. A heat pipe arranged between the contact portion and the fin. Therefore, the cold air generated at the cold end is dissipated and guided to the fins by the heat pipe. In this heat exchanger, the contact part may be positioned higher than the heat pipe. This can cause the refrigerant to condense on the upper part of the heat pipe and vaporize on the lower part of the heat pipe. Like heat pipes, several pipe diameters may be arranged upright. This allows refrigerants to be used in accordance with Chinese National Standards (CNS) A4 specifications (210 X 297 mm).

Line 542892 A7 B7 V. Description of the invention (6) The upper part of the heat pipe is condensed and naturally flows down to the lower part of the heat pipe through the action of gravity, which is where the refrigerant gasifies. According to another aspect of the present invention, a heat exchanger has a contact portion that keeps contact with the cold end of a Stirling cycle refrigerator, and a fin configuration, which can promote heat exchange at a point away from the contact portion. The hollow part between the contact part and the fin. The hollow part will be filled with refrigerant. When the Stirling cycle freezer is in operation, the refrigerant is liquid at the temperature of the contact side part of the hollow part, and gaseous at the temperature of the side part of the fins located at the hollow part. This allows cold air to be generated at the cold end, which diffuses and directs the refrigerant to the fins in a non-directional manner. In this heat exchanger, the contact portion may be arranged higher than the hollow portion. The position higher than the hollow part is located near the cold end, thus causing it to easily cause the refrigerant to condense. The condensed refrigerant is circulated by gravity to below the hollow part. As for the refrigerant, natural refrigerants such as carbon dioxide and hydrocarbons such as propane, butane, pentane or ammonia are used. According to another embodiment of the present invention, a refrigerator using the above-mentioned heat exchanger Stirling cycle refrigerator is provided. The heat exchanger is disposed inside the cold air duct, and air is circulated through the interior of the freezer chamber. Therefore, the air inside the freezer chamber flows between the fins. This allows the cold air generated at the cold end of the Stirling cycle freezer to be supplied to the air inside the cold rolling chamber through the heat exchanger. Brief description of the drawings: The above and other objects and characteristics of the present invention will be clear from the following description. -9- This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm). Binding

In the preferred specific examples of the line " slaves, reference should be made to the relevant drawings for explanation: 'Fig. 1. Vertical sectional view of the structure of the refrigerator embodied by the present invention; Fig. 2 · A first specific aspect of the present invention A perspective view of the structure of an example heat exchanger; a horizontal cross-sectional view of the structure of a second specific example of the heat exchanger of the present invention; A perspective view of another example of the structure of the fins of the converter; θ is a perspective view of another example of the structure of the fins of the heat-parent converter of the present invention; DETAILED DESCRIPTION OF THE INVENTION The invention is described below. Specific examples will be described with reference to the drawings. It should be noted that, if it has the same name as the prior art example shown in FIG. 7, it will be marked with the same number. First, the refrigerator embodying the present invention will be described. Figure 1 shows the section of the refrigerator: Figure 2 refers to the reference numeral 1 for the body, reference numeral 2 for the heat exchanger, reference and Shufu 3 table panels, and reference numeral 4 for the partition to separate the inside S of the refrigerator into a refrigerated partition. Room 1 a, zinc 荽 wood ^ room 1 b, and frozen compartment 1 c are kept at different temperatures according to their use functions. Reference numeral 5 denotes a machine room installed in the upper part of the main body 1, and therefore communicates with the outside of the refrigerator, and reference numeral 6 denotes a Stirling cycle cold beam machine disposed in the machine room 5. For the hot end of Stirling cycle refrigerator 6, mating • 10- 542892 A7 ___ — — ___B7 V. Description of the invention (8) There is a high-temperature side heat exchanger X 7. The heat generated at the hot end 61 is forced out of the refrigerator via the heat radiation fan 8. The cold end 62 located at the upper end of the cold 2 air duct 9 is arranged along the back surface of the body 1, and the top end of the cold end 62 is connected to the low-temperature side heat exchanger 10. Through the circulation of the air inside the refrigerator through the cold air duct 9 ′, the cold air generated at the cold end 6 2 is supplied to the flowing air, as a result of heat exchange through the low-temperature side heat exchanger 10. Next, the low-temperature side heat exchanger 10 of the first specific example will be described, which is installed in the above-mentioned refrigerator. Figure 2 shows a perspective view of this specific example. The low-temperature side heat exchanger 10 includes a base 101 ′ made of a material with high thermal conductivity similar to aluminum or copper sheet, and several fins 丨 02 attached to the base 101. Inside the cold air duct 9 (as shown in FIG. 1), the base 10 is located in the upright position in the figure. For the contact part 10lf fixed on the other surface of the base 101 (its position is higher than its center point), the cold end 62 of the Stirling cycle freezer (shown in FIG. I) is made of screws or similar objects (not on It is shown in the drawing, although it is shown in the drawings that the threaded holes 101a ', 10la', and 62a) provide sufficient pressure to hold them in close contact and fix them there. The contact surface is filled with high thermal conductivity grease or flake stone glue (filled with the contact element 1 2 in the figure), thus helping to enhance the adhesion. This allows the cold air generated at the cold end 62 to be effectively guided to the base 101. In addition, the number of grooves 10lb is configured to extend from the contact portion 101f to the lower end of the base 101, and to Enter these grooves 101b tightly in a mating manner to mating, and the inside of the heat pipe 13 will be filled with refrigerant. Pressing the heat pipe 13 into the groove 10lb tightly helps to complete the contact between the filling materials. -11-This paper size applies to China National Standard (CNS) A4 (210X297 mm) 542892 A7 _____B7 V. Description of the invention (9) " ~ " It results in a relatively south thermal conductivity and thus can improve heat exchange efficiency. As for the refrigerant, it is preferable to use an operating temperature range from 0. 〇 to -40. 〇 Refrigerant, that is, suitable for refrigerator use, does not damage the ozone layer and does not cause a greenhouse effect on the global environment. Preferred examples include carbor compound gases such as propane, butane, or ammonium. Inside the heat pipe 1 3, the refrigerant is condensed at the tail end of the upper layer near the cold end 62, and flows naturally downward by the action of gravity. The refrigerant then vaporizes and returns upward at the lower end of the heat pipe. As a result of the circulation of the refrigerant in this manner, the cold air spreads throughout the base 101 and is guided to the fins 102. Because the heat transfer tubes 13 are arranged in a direct mutual arrangement, the refrigerant circulates at high speed under the influence of gravity acceleration, and each heat conduction officer 13 can increase the amount of heat transfer. Therefore, the cold air at the base ιo is efficiently transmitted from the cold end 62 upward to the tail end farther away. This helps to increase the temperature uniformity of the base 10i. In addition, as described above, at one surface of the base 101, the fins 102 are welded with copper alloy or similarly firmly fixed. The fins 102 are all arranged upright in the same manner as the heat conducting officer 13. The path between the fins ιo2t is the path, and it is indicated by the arrow A from the top to the bottom in the drawing, and it is the air flowing through the cold air duct 9 (as shown in Fig. 1). Here, when the air flows downward between the fins 102, it receives cold air generated by the heat exchange through the fins 102, and its density becomes higher. This results in uneven air density and natural convection. Therefore, even if the cold air fan 11 (shown in FIG. 1) is driven by a lower power, the air can flow smoothly. k helps to reduce the power consumption of the cold air fan. Next ’For the first specific example described above, the low-temperature side heat exchanger 1-10 -12-

542892 V. Invention 10) ^ ------- State-item example 'will be described as follows. First of all, the position of the surface of the-plate is the base 101, which has several grooves ioib. In addition, if the heat-conducting pipe 13 ′ counts the tube with the same outer boundary, diameter, and diameter as the groove and the refrigerant sealed here, these tube diameters are tightly fitted into the tank 10 lb. That is, in this way, the heat pipe 12 is simply tightly fitted under a sufficient pressure (that is, no need to use screws or similar objects) to enter it, keeping it in close contact with the groove 1011). On the other side, the fins 102 are made of a thin-shell aluminum plate, and are located at a predetermined position of the pedestal 101, on which a copper-zinc alloy welding material is placed. Next, the copper-zinc alloy welding material is melted in the furnace and then hardened, so the fins 102 can be firmly connected to the base 101. Next, the low-temperature side heat exchanger 10 of the second specific example of the present invention will be described. As shown in FIG. 3, a horizontal sectional view of the low-temperature side heat exchanger i 0 for this specific example, and FIG. 4 is a vertical sectional view thereof. The low-temperature side heat exchanger 10 is similar to the first specific example shown in FIG. 2, and is composed of a base and several flat-shaped fins 102, which are arranged upright on one surface of the base 101 and the cold end 62 is fixed. The other surface contact portion 10 If fixed on the base 101 at a position higher than the center thereof is kept in close contact with it under sufficient pressure. The base 101 is arranged inside the cold air duct 9 (as shown in Fig. 1) and is located in the upright position of the drawing. In this specific example, the base 101 has a hollow portion 101c formed on the inside, such as the same heat pipe, and the refrigerant is sealed within the hollow portion 10lc through the refrigerant inlet 101d at the top of the hollow portion 101c. As for the use of the refrigerant, The first specific example generally uses carbon like propane, butane, pentane or ammonia.

Binding

Thread This paper is suitable for financial standards @ 家 标准 (CNS) Α4 size (210X297mm) 542892 A7 _______B7 V. Description of the invention (11 ~) '' '^ --- Hydrogen compounds. Inside the hollow portion 101c, there are several horizontally extending beams 10le. Depending on the type of refrigerant used and the temperature conditions, the static pressure inside the hollow part can be lower or lower than the atmospheric pressure, and the pressure difference generated by the cross beam 1016. Only these inspection beams 101e have openings, and screws 14 can be placed to connect the cold end 62 and the base 101 together. Inside the base 101, the refrigerant is condensed near the surface of the base 101 that is in close contact with the cold end 62, and vaporizes near the surface of the fins 102 that are attached to the base 101. In addition, because the base 101 is arranged in an upright position, the refrigerant is circulated in the vertical direction under the acceleration of gravity. Therefore, the cold air can be efficiently diffused throughout the base 101. In addition, in this specific example, the diffusion of the cold air is the result of the entire circulation of the refrigerant in the base 101. This results in a higher heat exchange efficiency than in the first specific example, and the cold air is diffused along the heat pipe 13 (as shown in Fig. 2). Next, an example describing the manufacturing process of the low-temperature side heat exchanger 10 as the second specific example above will be described as follows. First, two aluminum plates are used as the base 101, and the first thin-shell aluminum plate is formed by die-casting and has a substantially box shape. Next, a second thin-shell aluminum plate was placed thereon and welded with a copper-zinc alloy along the periphery of the box shape, and the refrigerant was sealed inside the hollow portion 10lc thus formed. On the other hand, the fin 102 is composed of a thin-shell aluminum plate at the same time, and a copper-zinc alloy welding material is placed on the base 101 at a predetermined position. Next, the copper-zinc alloy welding material is melted in the furnace and then hardened, so the fins 102 can be firmly attached to the base 101. The low-temperature side heat exchanger 1 in the first and second specific examples described above, 10, fin -14- this paper size Jia Pi (CNS) A4 ^ (21GX297 public love) 542892 A7 B7 5 invention description (12) shaped sheet 102 It can be constructed in any other form than the above, as long as they can provide high thermal conductivity. For example, in the low-temperature side heat exchanger 10 shown in FIG. 5, the fins 102 have a grid-shaped structure. In the low-temperature side heat exchanger 10 shown in Fig. 6, the fins 102 have a creped structure. These fins 102 shown in Figs. 5 and 6 have a larger area than the fins 102 of the first and second embodiments, and thus contribute to higher heat exchange efficiency. Like the structure described above, the refrigerator of the present invention has a simple structure in which only the low-temperature side heat exchanger needs to be fitted to the cold end of the Stirling cycle refrigerator. In addition, because the heat exchanger provides high heat exchanger efficiency, the refrigerator consumes less electrical power. Obviously, the present invention can produce several modifications and variations through the above contents. It should be understood that they are all within the scope of the patent application of the present invention, and the present invention may adopt other methods than those described above. Industrial application A specific heat exchanger of the present invention can be applied not only to the refrigerator described above, but also to a variety of devices, including gas cooling. -15- This paper size applies to China National Standard (CNS) A4 (210X297 mm)

Claims (1)

542892 AB c D VI. Application # Patent scope 1. A heat exchanger having a plate-shaped base and a fin attached to the surface of the base, part of which is used as a cooled part cooled by the outside , At least part of the fin is located outside the cooled part of the base, and includes a heat transfer mechanism that contains a medium, which changes between gaseous and liquid depending on the temperature. The heat transfer mechanism uses the medium The gasification and condensation cycle move, and the heat of the outer part of the cooled part of the base is transmitted to the cooled part. 2. The heat exchanger according to item 1 of the scope of patent application, wherein the heat exchange is a structure, a tube, a sealed medium therein, and is connected to the base. 3. The heat exchanger according to item 2 of the patent application, wherein the base has a groove formed in one of the grooves, so the tube is arranged in the groove formed on the surface of the base. 4. For example, the heat exchanger of the scope of patent application, wherein the base has a hollow portion formed on the inner side, and the medium is filled on the inner side of the base, so that the base itself functions as a heat transfer mechanism. 5. For example, the heat exchanger of item 1 of the patent application range, wherein the heat exchanger is configured so that the base part that transmits heat to the cooled part by the heat transfer mechanism is kept at a lower level than the cooled part. position. 6. A cooling system having a storage chamber for placing an object's gas from the inside of the storage chamber to the inside of the storage chamber via a circulation path, and a cooling device for cooling the air flowing through the circulation path, Including: -16- This paper size applies to China National Standard (CNS) A4 (210X297 mm) 542892 AB c D 6. The scope of patent application is the heat exchanger of item 1 of the scope of patent application, wherein the heat exchanger has fins arranged in the circulation path, and the cooling device is kept in contact with the part to be cooled for cooling. The part being cooled. 7. A heat exchanger having a contact portion that is kept in contact with a cold end of a Stirling cycle freezer and a fin-like arrangement that can promote heat exchange at a point away from the contact portion, including ： A heat pipe placed between the contact part and the fin. 8. The heat exchanger of item 7 in the scope of patent application, wherein the contact portion is arranged at a higher position than the heat pipe. 9. For example, the heat exchanger for item 7 of the scope of patent application, in which several pipe diameters are arranged upright, like heat pipes. 10. A refrigerator comprising a Stirling cycle freezer using a heat exchanger such as the item 7 of the patent application. 11. A heat exchanger having a contact portion that is kept in contact with a cold end of a Stirling cycle refrigerator and a fin-like arrangement that promotes heat exchange at a point away from the contact portion, wherein The heat exchanger has a hollow portion between the contact portion and the fin, and the hollow portion is filled with refrigerant. When the Stirling cycle refrigerator is in operation, the refrigerant is on the contact side of the hollow portion. It is liquid at a part of the temperature, and gaseous at a part of the side of the fins located in the hollow part. 12. The heat exchanger according to item 11 of the scope of patent application, wherein the configuration of the contact portion is higher than the hollow portion. -17- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) 8 8 8 8 AB c D 542892 6. Application for patent scope 1 3. For the heat exchanger of item 11 of the patent scope, where the refrigerant is carbon dioxide gas, hydrocarbon or ammonia-〇1 4. A refrigerator It includes a Stirling cycle refrigerator using a heat exchanger such as the one in the scope of patent application No. 11. -18- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)