JPH02171549A - Heat exchanger device - Google Patents

Abstract

PURPOSE:To perform a uniform heating of liquid refrigerant, expand a heat conducting area and further prevent a local heating of the refrigerant and an abnormal temperature rising of the heat exchanger by a method wherein a refrigerant passage member having a longitudinal passage provided with several corrugations at its inner surface is provided. CONSTITUTION:Liquid refrigerant passed through a refrigerant inlet pipe 21 and entered inlet header pipes 15 and 15 is dispersed from a lower part of a refrigerant passage member 13 into several longitudinal passages 14. A thermal spaced-apart wall member 10 may absorb heat of the combustion discharged gas passing through the heat conducting fins 17 and then the refrigerant in the longitudinal passage 14 of the refrigerant passage member 13 thermally connected is sufficiently heated from a lower part near the inlet header pipe 15. A part from the lower part of the longitudinal passage 14 to its upper part is heated to improve a natural circulating force, an intensive heating with the corrugations 14a formed at an inner wall surface of the passage 14 is further increased and a strong rising flow directed from a lower part to an upper part may generate an effect of agitating turburance flow with the corrugations 14a of the passage 14 and then the local abnormal over-heating of the refrigerant is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat exchange device that heats a fluid to be heated, such as a refrigerant, with a high-temperature fluid such as combustion gas.

Conventional Technology 1111J A refrigerant heating/heating machine as shown in FIG. 4 uses a refrigerant as the fluid to be heated, heats it with combustion gas, vaporizes the liquid refrigerant, and transports heat by latent heat to perform heating. In this system, a heat exchange device 1 for combustion gas and refrigerant and a radiator 2 are connected through a sealed pipe 3, and the refrigerant is forcibly circulated by a refrigerant conveyor 4 provided in the sealed pipe 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 the cylindrical inner circumferential surface extending in the horizontal direction, and a pipe holding portion 6 and a pipe 7 through which the refrigerant flows are provided on the outer circumferential surface in the axial direction. The combustion gas from the burner section 8 is caused to flow horizontally and laterally through the cylindrical inner surface 9 to heat the refrigerant flowing in the horizontally and laterally pipe 7 that is sent by the refrigerant conveyor.

The problem Hikoma is trying to solve However, this heating system requires external power to transport the refrigerant, and in order to reduce running costs during heating operation, it is possible to eliminate the external power for transporting the refrigerant and transport heat without power. It is valid. When performing refrigerant heating and heating by non-powered conveyance, the natural circulation force due to the buoyancy of the gaseous refrigerant generated when the liquid refrigerant is heated and blown out is essential. However, in the conventional heat exchange device 1 shown in FIG. 5, the refrigerant flows through the horizontally extending pipes 7, so that the gas component of the heated refrigerant in a gas-liquid two-phase mixture state smoothly exits. Because the refrigerant does not flow toward the refrigerant, the refrigerant stagnates, leading to abnormal local overheating, leading to thermal decomposition of the refrigerant and abnormal equipment temperature rises, which pose problems in terms of equipment reliability.

The present invention is intended to solve these problems, and aims to enable non-powered transport of refrigerant, ensure smooth flow of refrigerant, and improve heat exchange efficiency.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a refrigerant passage member having a vertical passage having a large number of irregularities formed on its inner surface, and an inlet communicating with the passage and attached to the refrigerant passage member. A header pipe, an outlet header pipe, a heat transfer partition member in close contact with the refrigerant passage portion l, 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 in the combustion chamber. It consists of a continuous burner section.

Effect of the present invention With the above-described configuration, the refrigerant in the passage is sufficiently heated by the heat transfer fins with high heat exchange efficiency, and the generation of bubbles in the refrigerant is promoted from the lower position, thereby increasing the natural circulation force due to the rise of the bubbles. It is possible to obtain a highly reliable system that reliably performs non-powered transport and does not cause thermal decomposition of the refrigerant.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. In FIGS. 1 to 3, 10 is a heat transfer partition member having a keyhole-shaped cross section, and a cylindrical portion 11 at the right end forming a combustion chamber;
The cylindrical portion 11 has a pair of parallel approach surfaces 12 facing each other at the lower portions of both right ends. A refrigerant passage member 13 is thermally connected to the outer surface of the heat transfer partition member 10, and is provided with a large number of vertical passages 14. A large number of depressions and depressions 14a are formed on the inner wall surface of the passage 14 (see FIG. 2). Reference numeral 15 indicates an inlet header pipe provided at the lower end of the refrigerant passage member 13, and reference numeral 16 indicates an outlet header pipe provided at the upper end of the refrigerant passage member 13.They are provided in pairs on the left and right, respectively, and the inlet header pipe 15 and the outlet header pipe 16 are They are communicated by a longitudinal passage 14, respectively. Reference numeral 17 denotes a heat transfer fin provided so as to be in thermal contact with the inside (between) the pair of parallel approach surfaces 12 . Reference numeral 18 denotes a combustion heat shield cylinder which is disposed to cover the inner surface of the cylindrical part 11 and forms a combustion chamber 19, and has a notch opening 20 in its lower part. 21 is inlet header pipe 1
5.15 is a refrigerant inlet pipe connected to it, 22 is a refrigerant outlet pipe connected to an outlet header pipe 16.16. Reference numeral 23 denotes a gutter-shaped exhaust lid that is provided to cover the lower opening of the parallel approach surface 12 of the heat transfer partition member 10 and constitutes the combustion exhaust gas passage 24, and is equipped with a drain vibe 25. 26 is a burner section mounted on the heat transfer partition member 10 so as to face the cylindrical section 11.

In the above configuration, the liquid refrigerant entering the inlet header pipe 15.15 through the refrigerant inlet @21 is transferred to the refrigerant passage member 1.
3 are distributed into a number of longitudinal passages 14 from the bottom. The heat transfer partition member 10 absorbs the heat of the combustion exhaust gas passing through the heat transfer fins 17 from the combustion chamber 19 via the combustion heat shield tube 18 on the parallel approach surface 12 provided with the heat transfer fins 17, and thermally The refrigerant in the vertical passage 14 of the refrigerant passage member 13 connected to the refrigerant passage member 13 is sufficiently heated from the lower part near the inlet header pipe 15. The heated liquid refrigerant then begins to evaporate and enters a gas-liquid two-phase state, producing bubbles in the liquid. The generated bubbles rise from below to above within the vertically provided passage 14 due to the buoyancy effect, creating a strong natural circulation force and carrying with them the liquid refrigerant that has not yet vaporized into the passage 14.
A bubble pumping action occurs that sends the refrigerant to the top of the tank. Further, in the upper part of the passage 14, the cylindrical part 11 efficiently absorbs heat from the even higher temperature exhaust gas immediately after combustion is completed, thereby further heating the gas-liquid two-phase refrigerant in the passage 14 and increasing the natural circulation force.

The refrigerant that has reached the upper end of the passage 14 flows into the outlet header pipe 16 and flows out through the refrigerant outlet pipe 22 toward a radiator (not shown).

In this way, by heating from the bottom to the top of the vertical passage 14, the natural circulation force is not only increased, but also by strongly heating the unevenness 14a formed on the inner wall surface of the passage 14, the natural circulation force is further enhanced. As the temperature increases, the strong upward flow from the bottom to the top and the irregularities 14a of the passage 14 generate a stirring turbulent flow effect to prevent local abnormal overheating of the refrigerant, thereby preventing thermal decomposition of the refrigerant or abnormal temperature rise of the equipment. It is possible to improve reliability by

Further, the refrigerant passage member 13 is made of a multi-hole flat tube made of aluminum having a large number of holes inside, and the heat transfer fins 11 are made of a band-shaped aluminum plate bent into a wave shape.
The heat transfer partition member 10 is a plating sheet in which the front and back sides of an aluminum core material are clad with brazing material in advance, and heat transfer fins made of aluminum are provided on the inner and outer surfaces of the heat transfer partition member 10 using this material. 17 and a refrigerant passage member 73 made of a multi-hole flat tube made of aluminum, and are thermally connected by integral plating at the same time, a lightweight heat exchanger with excellent heat transfer performance and no contact thermal resistance can be created. Moreover, it can be put to practical use at low cost.

Effects of the Invention As described above, according to the present invention, there is provided a refrigerant passage member having a vertical passage having a plurality of irregularities formed on its inner surface, and an inlet header pipe and an outlet header connected to the passage and 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;
It consists of a combustion chamber formed by a heat transfer partition member and a burner section connected to the combustion chamber, and the following effects can be expected.

The liquid refrigerant is uniformly heated by the refrigerant passage member having passages in the 11 direction, and by forming a large number of unevenness on the inner surface of the passage, the heat transfer area can be expanded and the bubble pump action can be significantly strengthened. The strong upward flow of the generated bubbles produces a stirring turbulence effect on the flow, which prevents local heating of the refrigerant and abnormal temperature rise of the heat exchange device, thereby improving reliability.

(2) Non-powered heat transfer is possible due to the bubble pump action caused by the rising bubble flow, creating @cells with low running costs.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention.
The figure is a perspective view of the external appearance of the heat exchange device, FIG. 2 is a sectional view taken along the line AA in FIG. 1 of the refrigerant passage member, FIG. 3 is a sectional view of the heat exchange device, and FIG. The configuration diagram and FIG. 5 are external perspective views of a conventional heat exchange device. 10... Heat transfer partition member, 11... Cylindrical part, 12...
・Parallel approach surface, 13... Refrigerant passage member, 14... Passage, 14a... Unevenness, 15... Inlet header pipe, 1
6... Outlet header pipe, 17... Heat transfer fin, 19
...All combustion, 26...Burner section. Agent Yoshihiro Morimoto IQ, -Yunran Butsukyo! Q Chitose 13-°-Reisho passage elevation 15゛・Tsu to the entrance-" Fig. 1 Fig. 2 Fig. 4a 14-through f each 14f-/Unevenness 3rd Fig.!!-Cylinder 9I5 tz-if line side the other side

Claims (1)

[Claims] 1. A refrigerant passage member having a vertical passage with many irregularities formed on the inner surface, an inlet header pipe and an outlet header pipe connected to the passage and attached to the refrigerant passage member, and a heat transfer member in close contact with the refrigerant passage member. A heat exchange device comprising a partition wall member, heat transfer fins in close contact with the heat transfer partition member, a combustion chamber formed by the heat transfer partition member, and a burner portion connected to the combustion chamber.