JP2584047B2 - Heat exchanger - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger that heats a refrigerant with a high-temperature gas such as a combustion gas and uses the refrigerant in a cooling and heating device.

2. Description of the Related Art There is a refrigerant heating / heating machine as shown in FIG. 4 which uses a refrigerant as a fluid to be heated, heats it with a combustion gas, evaporates and evaporates a liquid refrigerant, carries heat by latent heat, and performs heating. .

In this method, a heat exchanger 1 for combustion gas and a refrigerant and a radiator 2 are connected by a closed conduit 3 and the refrigerant is forcibly circulated by a refrigerant carrier 4 provided in the closed conduit 3.

FIG. 5 shows a conventional example of the heat exchanger 1 (JP-A-59-107167), in which a plurality of fins 5 are provided on a cylindrical inner peripheral surface extending in the horizontal direction, and a plurality of fins 5 are provided on the outer peripheral surface in the axial direction. A pipe holding section 6 and a pipe 7 through which a refrigerant flows are provided. The combustion gas from the burner 8 flows horizontally and horizontally to the cylindrical inner surface 9, and the combustion gas from the burner 8 flows in the horizontal and horizontal directions. This is for heating the refrigerant flowing through the pipe 7.

However, in this heating system, external power is required for transporting the refrigerant, and it is desired to reduce running costs during the heating operation.

SUMMARY OF THE INVENTION Problems to be Solved by the Invention It is effective to eliminate the external power for refrigerant transport and to carry out heat transfer without power to reduce the running cost during heating operation. The natural circulating force due to the buoyancy of the gaseous refrigerant generated by heating is important.

Conventionally, this type of heating device has a configuration similar to a refrigerant heating heat exchanger 1 as shown in FIG. 5, in which the refrigerant flows through a pipe 7 extending in a horizontal direction, so that the refrigerant is heated and gas-liquid two-phase mixed. Since the gas component of the refrigerant in the state does not flow smoothly toward the outlet, stagnation of the refrigerant occurs, causing local abnormal overheating, and since the combustion chamber and the heat exchange unit are integrated, the heat exchange amount depends on the combustion state Due to the non-uniformity, there has been a problem in the reliability performance of equipment such as local overheating and thermal decomposition of refrigerant or abnormal rise in temperature of equipment.

The present invention solves the conventional problem described above, and the natural circulation cycle of the refrigerant heater heated by a burner or the like is smoothly circulated by increasing the natural circulation force due to the rise of bubbles, and `` aluminum made of aluminum having a large heat conductivity is used. By brazing the members, heat is transferred more efficiently and the thermal efficiency is improved.This ensures reliable non-powered heat transfer and does not cause thermal decomposition of the refrigerant. It is an object of the present invention to provide a highly reliable system without causing thermal decomposition of the refrigerant by maintaining the uniform circulation of the refrigerant.

Means for Solving the Problems The present invention provides a plate-shaped aluminum heat transfer partition member, brazes an aluminum refrigerant passage member on one surface, and forms a combustion chamber at a frame-shaped mounting annular edge on the other surface. An end plate is fixed, a high-temperature gas passage is formed between the heat transfer partition member and a combustion chamber end plate, and a combustion chamber housing having a burner burned in a fuel supply device is fixed to a central portion of the combustion chamber end plate. A heat insulating material is provided on the entire inner surface wall of the combustion chamber housing, a combustion gas outlet hole is provided in the combustion chamber end plate, and at least an upper portion of the heat transfer partition member at a position corresponding to the combustion gas outlet hole. A heat transfer fin formed with a large number of aluminum fin pieces is brazed, and an aluminum header tube is brazed vertically to the refrigerant passage member.

According to the present invention, the combustion gas passes through the natural gas circulation cycle of the refrigerant heater heated by the burner or the like through the combustion gas outlet hole provided in communication with the combustion chamber having the adiabatic configuration. Since it is composed of a heat transfer partition member having a heat transfer fin formed with a large number of fin pieces in close contact with the high-temperature gas passage and a refrigerant passage member having a multi-hole tube structure having a vertical passage, the temperature and flow of combustion gas Therefore, each part of the refrigerant passage member can be uniformly heated, the refrigerant can be circulated smoothly, and the refrigerant can be transported without power locally without overheating locally, so that thermal decomposition of the refrigerant does not occur.

"The heat transfer partition member, the refrigerant passage member, the heat transfer fin, and the header tube are made of aluminum having a high thermal conductivity, so that the heat resistance from the heat transfer fin to the refrigerant passage member through the heat transfer partition member is reduced. And the heat generated by combustion in the combustion chamber is transferred to the refrigerant passage member with high heat exchange efficiency through the heat transfer fins and the heat transfer partition members, so that the efficiency can be increased and the equipment can be made more compact. By brazing the heat transfer partition member, refrigerant passage member and heat transfer fin, heat resistance does not occur due to the formation of an air layer, etc., and the heat resistance can be maintained stably small, increasing efficiency and maintaining high efficiency and stability. After assembly, the components can be simply configured by integral brazing, and the cost can be reduced, the airtightness can be reliably maintained, the refrigerant gas does not leak, and the safety and durability are high. " The inner wall of the high-temperature gas passage is constituted by the combustion chamber, and the heat transfer partition member constituting the outer wall and the double wall structure constituted by the refrigerant passage member which is in close contact with the heat transfer partition member. Heat transfer efficiency increases due to heat transfer to the passage, and refrigerant is prevented from leaking to the combustion gas portion by a double wall structure composed of a multi-hole tube-structured refrigerant passage member, and the high-temperature combustion chamber and refrigerant passage are connected by a high-temperature gas passage. Because it is completely separated, there is no thermal decomposition or deterioration of the refrigerant due to local overheating,
It is a highly reliable system.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a sectional view of an embodiment of the heat exchanger of the present invention, and FIG.
FIG. 3 is a sectional view of the refrigerant passage member of the present invention, and FIG. 3 is an exploded perspective view of the heat exchanger of FIG.

1 to 3, reference numeral 10 denotes a combustion chamber provided in communication with a burner 8 connected to a fuel supply device, 10A denotes a combustion chamber housing, and 11 denotes a plate-shaped aluminum heat transfer partition member. , 12A is a box-shaped combustion chamber end plate having a frame-shaped mounting annular edge portion 12B. The mounting annular edge portion 12B is fixed to the heat transfer partition member 11 in close contact with the combustion chamber end plate 12A and the heat transfer partition member. A high-temperature gas passage 12 is formed between 11. A combustion gas outlet hole 13 is formed in the center of the combustion chamber end plate 12A, and an exhaust passage 14 is provided in the high temperature gas passage 12. Reference numeral 15 denotes an aluminum refrigerant passage member brazed to the outer surface of the heat transfer partition member 11, and a number of vertical passages 16 are provided. Reference numeral 17 denotes an aluminum inlet header pipe brazed to the lower end of the refrigerant passage member 15, and 18 denotes an aluminum outlet header pipe brazed to the upper end of the refrigerant passage member 15, and the inlet pipe 19 and the outlet pipe, respectively. Pipes 20 are connected to each other and connected to the refrigerant circuit. The other end of the inlet header pipe 17 is provided with an oil drain pipe 21 which is bent downward. The inlet header pipe 17 and the outlet header pipe 18 communicate with each other by a vertical passage 16.

Reference numerals 22A and 22B denote aluminum heat transfer fins provided by brazing so as to be in thermal contact with the inside of the heat transfer partition member 11, which are bent in a wave shape to form a large number of fin pieces. The remaining inner wall of the combustion chamber 10 which is not in contact with the hot gas passage 12 is provided with a heat insulating material 23 covering the entire surface.

 The operation of the heat exchanger of the present invention will be described.

In the above configuration, the fuel supplied by the fuel supply device is burned by the burner 8, and the high-temperature gas generated in the combustion chamber 10 passes through the combustion gas outlet 13, and the heat transfer fins 22 of the high-temperature gas passage 12 are formed.
The air passes between A and 22B and is exhausted from the exhaust passage 14.

The liquid refrigerant that has entered the inlet header pipe 17 through the refrigerant inlet pipe 19 diverges through a number of vertical passages 16 from the lower portion of the refrigerant passage member 15, and the heat transfer fins 22A and 22B cause the combustion gas in the hot gas passage 12 to flow therethrough. The heat is transferred to the refrigerant passage member 15 which is thermally connected at the central portion, and the longitudinal passage 16 of the refrigerant passage member 15 is
The inside refrigerant is sufficiently heated from the lower portion near the inlet header 17. Then, the heated liquid refrigerant starts vaporizing and evaporating, and enters a gas-liquid two-phase state in which bubbles are generated in the liquid. The generated bubbles rise upward from below in the passage 16 provided in the vertical direction by the buoyancy effect, and particularly, the combustion gas is covered with the heat insulating material 23 so that the entire inner surface is covered with the combustion chamber.
After exiting the combustion gas outlet hole 13 from 10, the heat is transferred to the refrigerant in the high-temperature gas passage 12, so that the combustion gas temperature and flow can be made uniform, and each part of the refrigerant passage member can be uniformly heated, and the refrigerant can be smoothly and uniformly evaporated. In addition, the non-powered heat transfer is reliably performed without locally heating the refrigerant, so that the refrigerant is not thermally decomposed.

Uniform heating also increases the generation of bubbles by reducing the flow resistance in the passage 16, increasing the bubble rising force, increasing the natural circulation force, and moving to the top of the passage 16 with the liquid refrigerant that has not been vaporized yet. A bubble pump action for sending the refrigerant occurs.

Further, the entire surface of the heat transfer partition member 11 other than the heat transfer fins 22A and 22B provided in the upper and lower portions of the passage 16 also serves as a heat transfer area and efficiently absorbs heat from the heating fluid flowing through the high-temperature gas passage 12 to allow the gas-liquid The refrigerant in the phase is further heated to further increase the natural circulation force. The refrigerant that has reached the upper end of the passage 16 flows into the outlet header tube 18 and flows out of the refrigerant outlet tube 20 toward a radiator (not shown).

In this way, not only the natural circulation is enhanced by heating from the lower portion to the upper portion of the vertical direction 16, but also the natural circulation force is further increased by heating the lower portion 16 with the heat transfer fins 22B.

Further, the inner wall of the high-temperature gas passage 12 is constituted by the combustion chamber end plate 12A of the combustion chamber 10, and the heat transfer partition member 11 constituting the outer wall and the refrigerant passage member 15 which is in close contact with the heat transfer partition member 11 are formed. Due to the double wall configuration, heat is transferred from the combustion chamber end plate 12A, which is the inner wall, to the refrigerant passage 16 through the heat transfer fins 22A and 22B, thereby increasing heat transfer efficiency. The double wall structure prevents the refrigerant from leaking into the combustion gas section and safely separates the high-temperature combustion chamber 10 and refrigerant passage 16 by the high-temperature gas passage 12, so that thermal decomposition and deterioration of the refrigerant due to local overheating do not occur, or equipment abnormality This is a highly reliable system that prevents temperature rise.

Remaining housing 10A not in contact with hot gas passage 12 of combustion chamber 10
It is covered with a heat insulating material 23 on the inner wall surface to prevent heat radiation.

"The heat transfer partition member 11, the refrigerant passage member 15, the heat transfer fins 22A and 22B, and the header tubes 17 and 18 are made of aluminum having a large heat conductivity, so that the heat transfer partition members are separated from the heat transfer fins 22A and 22B. The heat generated by the combustion in the combustion chamber 10 is reduced through the heat transfer fins 22A and 22B and the heat transfer partition member 11 so that the heat resistance of the refrigerant passage member 15 is reduced.
The heat transfer efficiency is high and the heat transfer efficiency is high, and the efficiency and the size of the machine and vessel can be reduced. Further, the heat transfer partition member 11, the refrigerant passage member 15, and the heat transfer fins 22A and 22B are brazed to form the heat transfer partition member 11, the refrigerant passage member 15, and the heat transfer fins.
There is no thermal resistance caused by an air layer or the like between the parts of 22A, 22B, and the thermal resistance from the heat transfer fins 22A, 22B to the refrigerant passage member 15 via the heat transfer partition member 11 can be stably maintained low, Heat exchange efficiency can be increased and efficiency can be maintained stably.
Further, the heat transfer partition member 11, the refrigerant passage member 15, and the heat transfer fins are provided.
By brazing 22A, 22B and header tubes 17, 18, each member can be made simple structure by integrated brazing after assembly, cost reduction is possible, and it is sure to braze all connecting parts Airtightness can be maintained, refrigerant does not leak, and safety and durability are high. And
As a specific example of the configuration, the refrigerant passage member 15 is an aluminum multi-hole flat extruded tube having a large number of holes therein, and the heat transfer fins 22A and 22B are formed by bending a strip-shaped aluminum plate into a wave shape. And, the heat transfer partition member 11 is made of aluminum as a brazing sheet in which a brazing material is pre-clad on the front and back of an aluminum core material. Assembled using the refrigerant passage member 15 of the multi-hole flat extruded tube, and can be thermally connected by simultaneously brazing integrally,
A heat exchanger having no contact heat resistance and excellent in heat transfer performance can be put to practical use at a light weight and at a low cost.

Further, the inner wall of the high-temperature gas passage 12 is constituted by a combustion chamber end plate 12A, and the heat transfer partition member 11 serving as the outer wall of the combustion chamber 10 is used as a brazing sheet in which a brazing material is clad in advance on one side of an aluminum core material. The heat from the combustion chamber 10 is transferred to the refrigerant passage 16 through the heat transfer fins 22A and 22B by forming the heat transfer fins 22A and 22B integrally with the heat transfer fins 22A and 22B by integral brazing.
In addition, heat is transferred with high heat exchange efficiency, which makes it possible to increase efficiency and downsize equipment. When the outer wall of the high-pressure gas passage 12 is made of aluminum and brazed integrally with the heat transfer partition member 11, the airtightness can be maintained with a simple structure, and the exhaust gas does not leak and the safety is high.

In addition, a passage communicating with the passage 16 of the refrigerant passage member 15 on the outer periphery of the heat insulating material 23 covering the remaining outer surface not in contact with the high-temperature gas passage 12 of the combustion chamber 10 (for example, a pipe connecting the closed conduit 3 to the radiator 3). Are closely connected to each other, the heat radiated from the heat insulating material 23 to the outside is transferred to the refrigerant circuit, and a more efficient system is obtained.
The oil of the compressor is always dissolved in the refrigerant, and when the refrigerant is vaporized by the heater, the oil gradually accumulates. If a large amount of oil accumulates, it hinders the vaporization and circulation of the refrigerant due to its viscosity and heat conduction. Refrigerant passage of refrigerant passage member 15
The bottom of 16 is connected to the inlet header 17 at the bottom and bent downward to provide an oil drain pipe 21.When oil accumulates in the heater, the oil is discharged together with the refrigerant from the oil drain pipe, and the oil is reliably removed from the heater. By maintaining the uniform circulation of the refrigerant, the system is highly reliable without causing thermal decomposition of the refrigerant due to local overheating.

Effect of the Invention As described above, according to the present invention, "a plate-shaped aluminum heat transfer partition member is provided, an aluminum refrigerant passage member is brazed on one surface, and a combustion chamber is formed on the other surface at a frame-shaped mounting annular edge. An end plate is fixed, a high-temperature gas passage is formed between the heat transfer partition member and the combustion chamber end plate, and a combustion chamber housing having a burner connected to a fuel supply device is fixed to a central portion of the combustion chamber end plate. A heat insulating material is provided on the entire inner surface wall of the combustion chamber housing, a combustion gas outlet hole is provided in the combustion chamber end plate, and at least an upper portion of the heat transfer partition member at a position corresponding to the combustion gas outlet hole. According to a heat exchanger in which a heat transfer fin formed with a large number of aluminum fin pieces is brazed and an aluminum header tube is brazed vertically to the refrigerant passage member. ”(1) Heat transfer partition member , Refrigerant passage member, heat transfer fin and header Is made of aluminum having high thermal conductivity, the thermal resistance from the heat transfer fin to the refrigerant passage member via the heat transfer partition member is reduced, and the heat generated by combustion in the combustion chamber is transferred to the heat transfer fin, Heat is transferred to the refrigerant passage member with high heat exchange efficiency through the heat partition member, so that the efficiency can be increased and the equipment can be downsized.

(2) The heat transfer partition member, the refrigerant passage member, and the heat transfer fin
By brazing, heat resistance such as an air layer does not occur between the heat transfer partition member, the refrigerant passage member, and the components of the heat transfer fin, and heat from the heat transfer fin to the refrigerant passage member via the heat transfer partition member does not occur. Resistance can be maintained stably and small, and efficiency can be increased and high efficiency can be maintained stably. (3) In addition, the heat transfer partition member, the refrigerant passage member, the heat transfer fin, and the header tube are assembled by brazing. After the brazing, the components can be simplified and the cost can be reduced by brazing, and the airtightness can be reliably maintained by brazing all the connecting parts, so that the refrigerant does not leak and the safety and durability are high. Things.

(4) An outer peripheral heat transfer partition member and an outer peripheral heat transfer partition that constitute a part of the high-temperature gas passage through which the combustion gas passes through a combustion gas outlet provided in communication with a combustion chamber having an adiabatic configuration. By passing a heat transfer fin formed with a large number of fin pieces in close contact with the member, a refrigerant passage member having a multi-hole tube structure having a vertical passage is formed in close contact with the outer peripheral heat partition portion, so that the combustion gas The temperature and flow can be made uniform, each part of the refrigerant passage member can be uniformly heated, the refrigerant can be circulated smoothly, and the refrigerant can be reliably heated without power overheating locally without causing thermal decomposition of the refrigerant. Uniform heating also increases the generation of bubbles by reducing the flow resistance in the passage 16, increases the bubble rising power, strengthens the natural circulation force, increases the heat exchange efficiency, and makes it possible to make the equipment compact. Abnormal temperature It is possible to improve the reliability by increasing prevented.

(5) The non-powered heat transfer becomes possible by the bubble pump action by the rising bubble flow, and the heating with low running cost can be performed.

(6) The refrigerant wall member 15 is integrally formed with the outer peripheral heat transfer partition to prevent the refrigerant from leaking into the combustion gas portion by the double wall configuration, and to completely separate the high temperature combustion chamber and the refrigerant passage by the high temperature gas passage to locally overheat. The system does not cause thermal decomposition and deterioration of the refrigerant due to, or is a highly reliable system by preventing abnormal temperature rise of equipment.Simple structure and airtightness can be maintained, exhaust gas does not leak, and even if refrigerant leaks, flames will also occur. High safety without direct contact of the refrigerant gas.

(7) Combustion by forming the outer wall of the combustion chamber constituting the inner wall of the high-temperature gas passage as a brazing sheet in which a brazing material is clad in advance on one side of an aluminum core material and integrally forming the heat transfer fins by integral brazing. Heat from the chamber is transferred to the refrigerant passage with high efficiency heat exchange efficiency through the heat transfer fins, which makes it possible to increase the efficiency and make the equipment more compact. Is high and the safety is high.

(8) A passage (for example, a pipe to a radiator of a closed conduit) communicating with the passage of the refrigerant passage member is closely formed around the outer periphery of the heat insulating material covering the remaining outer surface not in contact with the high-temperature gas passage of the combustion chamber. Then, the heat radiated from the heat insulating material to the outside is transferred to the refrigerant circuit, and a more efficient system can be configured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of the heat exchanger of the present invention, FIG. 2 is a cross-sectional view of a refrigerant passage member of the present invention, FIG. 3 is an exploded perspective view of FIG. 1, and FIG. Is a circuit configuration diagram of a conventional refrigerant heater, and FIG. 5 is an external perspective view of a conventional refrigerant heater. 8: Burner, 10: Combustion chamber, 11: Heat transfer partition member, 12: High temperature gas passage, 12A: Combustion chamber end plate, 13: Combustion gas outlet hole, 14: Exhaust part, 15: Refrigerant passage member, 16: Passage , 17: inlet header pipe, 18: outlet header pipe, 19, 20: inlet pipe, outlet pipe, 21: oil drain pipe, 22A, 22B: heat transfer fin.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Tatsunori Sakuratake 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Koichiro Yamaguchi 1006 Kadoma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. In company

Claims (1)

(57) [Claims] 1. A plate-shaped aluminum heat transfer partition member is provided, an aluminum refrigerant passage member is brazed to one surface, and a combustion chamber end plate is fixed to the other surface at a frame-shaped mounting annular edge. Forming a high-temperature gas passage between the heat transfer partition member and the end plate of the combustion chamber, and fixing a combustion chamber housing having a burner burned to a fuel supply device to a central portion of the combustion chamber end plate; A heat insulating material is provided on the entire inner wall of the body, a combustion gas outlet hole is provided in the combustion chamber end plate, and a plurality of aluminum fins are provided at least above the heat transfer partition member at a position corresponding to the combustion gas outlet hole. A heat exchanger in which a heat transfer fin in which a piece is formed is brazed, and an aluminum header tube is brazed vertically to the refrigerant passage member.