JPH0694948B2 - Heat exchanger - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange device for heating a heated fluid such as a refrigerant with a high temperature fluid such as combustion gas.

2. Description of the Related Art A refrigerant heating / heating machine as shown in FIG. 4 is used for heating by using a refrigerant as a fluid to be heated and heating it by a combustion gas to evaporate a liquid refrigerant to carry heat by latent heat. This is to connect the heat exchange device 1 for combustion gas and the refrigerant to the radiator 2 by the closed pipe line 3 and forcibly circulate the refrigerant by the refrigerant carrier 4 provided in the closed pipe line 3. FIG. 5 shows a conventional example of the heat exchange device 1 (JP-A-59)
-107167), a plurality of fins 5 are provided on a cylindrical inner peripheral surface extending in the horizontal direction, and a pipe holding portion 6 is provided in the axial direction of the outer peripheral surface.
And a pipe 7 through which the refrigerant flows inside. The combustion gas from the burner portion 8 is caused to flow horizontally in the cylindrical inner surface 9 and the inside of the horizontal pipe 7 sent by the refrigerant carrier is passed. It heats the flowing refrigerant.

However, in this heating system, external power is required to transfer the refrigerant, and in order to reduce the running cost during heating operation, it is effective to transfer the heat without power to remove the external power for transferring the refrigerant. Is. When performing refrigerant heating and heating by powerless transportation, the natural circulation force due to the buoyancy of the gas refrigerant generated by heating the liquid refrigerant is important. However, in the configuration such as the conventional heat exchange device 1 shown in FIG. 5, the refrigerant flows through the pipe 7 extending in the horizontal direction, so that the gas component of the heated refrigerant in the gas-liquid two-phase mixed state smoothly exits. Since it does not flow in the opposite direction, stagnation of the refrigerant occurs, causing local abnormal overheating,
There was a problem on the reliability of the device such as thermal decomposition of the refrigerant or abnormal temperature rise of the device.

The present invention solves such a problem, and an object of the present invention is to enable unpowered transfer of a refrigerant, to achieve a smooth flow of the refrigerant, and to improve heat exchange efficiency.

Means for Solving the Problems In order to solve the above problems, the present invention provides a refrigerant passage member having a vertical passage having a large number of irregularities formed on an inner surface thereof, and an inlet connected to the passage and attached to the refrigerant passage member. A header pipe and an outlet header pipe, a heat transfer partition member in close contact with the refrigerant passage member, a heat transfer fin in close contact with the heat transfer partition member, a combustion chamber formed by the heat transfer partition member, and a combustion chamber connected to this combustion chamber. It is composed of a burner part installed.

Action The present invention is configured to sufficiently heat the refrigerant in the passage by the heat transfer fins having high heat exchange efficiency to promote the generation of the bubbles of the refrigerant from the lower position to increase the natural circulation force due to the bubbles rising. It is possible to obtain a highly reliable system in which the powerless transfer is surely performed and the thermal decomposition of the refrigerant does not occur.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 3, reference numeral 10 denotes a heat transfer partition member having a keyhole-shaped cross section, and a cylindrical portion 11 having an end that forms a combustion chamber and lower end portions of the cylindrical portion 11 facing each other face each other. It has a pair of parallel approaching surfaces 12. Reference numeral 13 denotes a refrigerant passage member that is thermally connected to the outer surface of the heat transfer partition member 10, and has a vertical passage 14
Are provided in large numbers. Many irregularities on the inner wall of passage 14
14a is formed (see FIG. 2). Reference numeral 15 is an inlet header pipe provided at the lower end of the refrigerant passage member 13, and 16 is a refrigerant passage member.
Outlet header pipes are provided at the upper end of 13, and a pair of left and right outlet header pipes are provided. The inlet header pipes 15 and the outlet header pipes 16 communicate with each other through vertical passages 14. 17
Is a heat transfer fin provided so as to be in thermal contact with the inside (between) of the pair of parallel approaching surfaces 12. Reference numeral 18 is a combustion heat shield cylinder which is arranged so as to cover the inner surface of the cylindrical portion 11 and forms a combustion chamber 19, which has a notch opening 20 in the lower portion. 21 is a refrigerant inlet pipe connected to the inlet header pipes 15 and 15, 22 is an outlet header pipe 1
It is a refrigerant outlet pipe connected to 6,16. 25 is a heat transfer partition member
A gutter-shaped exhaust lid which is provided so as to cover the lower opening of the parallel approaching surface 12 of 10 and constitutes a combustion exhaust gas passage 24, and is provided with a drain pipe 25. Reference numeral 26 is a burner portion mounted on the heat transfer partition member 10 so as to face the cylindrical portion 11.

In the above configuration, the liquid refrigerant that has passed through the refrigerant inlet pipe 21 and entered the inlet header pipes 15 and 15 is dispersed from the lower portion of the refrigerant passage member 13 into a large number of vertical passages 14. Heat transfer partition member 10
In the parallel approaching surface 12 where the heat transfer fins 17 are provided, the heat absorbed by the combustion exhaust gas passing through the heat transfer fins 17 from the combustion chamber 19 through the combustion heat shield cylinder 18 is absorbed, and the refrigerant is thermally coupled. The refrigerant in the vertical passage 14 of the passage member 13 is sufficiently heated from the lower portion near the inlet header pipe 15. Then, the heated liquid refrigerant starts vaporization and evaporation, and becomes a gas-liquid two-phase state in which bubbles are generated in the liquid. Then, the generated bubbles rise upward from below in the passage 14 provided in the vertical direction due to the buoyancy effect,
A bubble pump action is generated that sends a refrigerant to the upper part of the passage 14 with a strong natural circulation force and the liquid refrigerant that has not yet vaporized. Further, also in the upper part of the passage 14, the cylindrical portion 11
By more efficiently absorbing heat from the hotter exhaust gas immediately after the completion of combustion, the refrigerant in the gas-liquid two-phase state in the passage 14 is further heated to increase the natural circulation force. The refrigerant reaching the upper end of the passage 14 flows into the outlet header pipe 16, and the refrigerant outlet pipe 22
It flows out toward a radiator (not shown).

In this way, by heating from the bottom to the top of the vertical passage 14, not only the natural circulation force is increased, but also the passage is increased.
The natural circulation force is further increased by heating strongly with the unevenness 14a formed on the inner wall surface of the refrigerant 14, and a strong upward flow from the lower side to the upper side and the unevenness 14a of the passage 14 generate a stirring turbulence effect of the flow to generate the refrigerant. By preventing the local abnormal overheating, the reliability can be improved by the thermal decomposition of the refrigerant or the abnormal temperature rise of the device.

Further, the refrigerant passage member 13 is formed of a multi-hole flat tube made of aluminum having a large number of holes inside, and the heat transfer fins 17 are formed by bending a band-shaped aluminum plate in a wave shape, and the heat transfer partition member 10 Is a brazing sheet with a brazing material pre-clad on both sides of the aluminum core,
Assembling by using the heat transfer fins 17 made of aluminum and the refrigerant passage member 13 of a multi-hole flat tube made of aluminum on the inner and outer surfaces of the heat transfer partition member 10 using this material, and thermally coupled by integrally brazing at the same time. By doing so, it is possible to put the heat exchanger, which has no contact heat resistance and is excellent in heat transfer performance, into practical use at a low weight and at a low cost.

EFFECTS OF THE INVENTION As described above, according to the present invention, a refrigerant passage member having a vertical passage having a large number of irregularities formed on the inner surface thereof, and an inlet header pipe and an outlet header which are connected to the passage and are attached to the refrigerant passage member. A tube, a heat transfer partition member in close contact with the refrigerant passage member, and a heat transfer fin in close contact with the heat transfer partition member,
The combustion chamber is formed of a heat transfer partition member, and the burner section connected to the combustion chamber is provided, and the following effects can be expected.

(1) The liquid refrigerant is uniformly heated by the refrigerant passage member having the vertical passage, and a large number of irregularities are formed on the inner surface of the passage so that the heat transfer area can be expanded and the bubble pump action can be remarkably strengthened. Further, the strong rising flow of the generated bubbles exerts a stirring turbulent flow effect on the flow, prevents local heating of the refrigerant and abnormal temperature rise of the heat exchange device, and improves reliability.

(2) The bubble pump action by the rising bubble flow enables non-powered heat transfer, which enables heating at low running cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 3 show an embodiment of the present invention.
FIG. 1 is an external perspective view of a heat exchange device, FIG. 2 is a cross-sectional view of the refrigerant passage member taken along the line A-A in FIG. 1, FIG. 3 is a cross-sectional view of the heat exchange device, and FIG. 4 is a circuit of a conventional refrigerant heating / heating machine. FIG. 5 is an external perspective view of a conventional heat exchange device. 10 ... Heat transfer partition member, 11 ... Cylindrical part, 12 ... Parallel approaching surface, 13 ... Refrigerant passage member, 14 ... Passage, 14a ... Concavity and convexity, 1
5 …… Inlet header tube, 16 …… Outlet header tube, 17 ……
Heat transfer fins, 19 ... Combustion chamber, 2 ... Burner section.

Claims (1)

[Claims] 1. A refrigerant passage member having a vertical passage having a large number of irregularities formed on its inner surface, an inlet header pipe and an outlet header pipe connected to the passage and attached to the refrigerant passage member, and closely adhered to the refrigerant passage member. And a heat transfer fin that is in close contact with the heat transfer partition member, a combustion chamber formed by the heat transfer partition member, and a burner portion that is connected to the combustion chamber.