JPS58184490A - Heat exchanger - Google Patents

Abstract

PURPOSE:To obtain the heat exchanger which has a small heat conduction resistance and is compact in size and which is manufactured at low cost, by a method wherein a flow regulating member for a heat medium is arranged within an inner cylinder having a number of fins on the inner surface thereof leaving a clearance from the latter so that the clearance serves as a primary side fluid passage and a heat conductive member having a secondary side fluid conduit embedded therein is bonded tightly to the outer circumference of the inner cylinder. CONSTITUTION:The heat medium which is a high temperature gas from a primary side fluid inlet port 5 enters a primary side fluid passage 10 divided into a number of sections, through an inlet chamber 11. In this case, the heat medium radiates heat to the water in a pipe 13 through the inner surface of the inner cylinder, fins 2 and a heat conductive member 16, condenses to become a low temperature liquid which collects in an outlet chamber 12 and flows out from a primary side fluid outlet port 6. At the same time, the water enters the pipe 13 from a secondary side fluid inlet port 14, flows upward along the outer periphery of the inner cylinder in a helical fashion so as to be heated to an elevated temperature by the high temperature heat medium and flows out from a secondary side fluid flow-out port 15 provided at the upper part of the heat exchanger. Thus, as the heat medium flows vertically from the upper part down to the lower part of the heat exchanger, the condensed and liquefied heat medium falls down smoothly to the lower part of the heat exchanger. Accordingly, the liquid film generating on the heat transfer wall of the heat exchanger at the time of condensation of the heat medium become thin so that the increase of thermal resistance due to an increase in the thickness of the liquid film is prevented and the heat transfer efficiency of the heat exchanger is improved.

Description

[Detailed Description of the Invention] The present invention includes the entire configuration of a refrigerator or a heat pump.
This paper relates to a water-cooled heat exchanger.

Conventional water-cooled condensers use double tube heat exchangers No. 3 and 4.
There are shell-and-tube heat exchangers (not shown), double-wall heat exchangers with parallel water tubes and refrigerant pipes (not shown), and the chair-t also uses tubes to construct water passages and refrigerant passages. It is something. Particularly in systems that use hot cooling water for hot water supply, double-tube heat exchangers and shell-and-tube heat exchangers are less reliable in preventing the refrigerant and lubricating oil from mixing with the hot water supply. Since this is not satisfactory, double-walled heat exchangers with parallel water tubes and refrigerant tubes have been mainly used. Furthermore, a triple-tube heat exchanger (Figure 5) with double inner tubes has been proposed as an Anzen Shinsei heat exchanger that prevents the mixing of refrigerant, lubricating oil, and hot water supply. Since the structure of the chair also uses tube materials, it is difficult to make the heat transfer area denser due to the shape and configuration of the tube materials, or to make the heat exchanger itself smaller and more resource-saving. Met.

The present invention completely eliminates the drawbacks of various conventional heat exchangers, and provides a heat exchanger that is reliable in preventing the mixing of refrigerant and lubricating oil with hot water, and is also smaller and lighter to save resources. The overall purpose is to obtain the same at low cost.

In order to achieve this object, the present invention provides a fluid regulator with a bottom at least on the primary 41111 fluid inlet side inside a cylindrical inner cylinder integrally molded with a large number of fins extending inwardly in the axial direction by full extrusion processing. , with both end faces of the inner cylinder sealed and a gap divided by fins between the inner cylinder and the fluid regulator serving as the primary fluid passage, and a spirally wound pipe serving as the secondary fluid passage. A buried annular heat conductor is joined to the outer circumference of the inner cylinder.

With this configuration, the heat transfer area is expanded by providing a large number of fins in the part that comes into contact with the primary fluid. The air gap can be set in a shape that transfers heat most efficiently, and the tube that becomes the secondary fluid passage is thermally in close contact with the inner cylinder that comes in contact with the first-order fluid through a thermal conductor soaked in heat conductivity. Low heat transfer resistance. Therefore, the heat exchanger can be made smaller and more dense.

Further, since the fluids on the negative side and the secondary side are separated by the inner cylinder, the heat conductor, and the heat conductor, it is possible to ensure reliability in preventing mixing of the two fluids.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 of all drawings.

Reference numeral 1 denotes a cylindrical inner cylinder whose inner surface is integrally formed with a large number of fins 2 extending in the axial direction by extrusion processing, and both upper and lower end surfaces of the inner cylinder 1 are sealed from the ends 3 and 4. A primary fluid inlet 6 is provided at the upper end 3 and a primary fluid outlet 6 is provided at the lower end 4.

Reference numeral 7 denotes a cylindrical fluid regulating body provided in the hollow part of the inner cylinder 1, and a bottom part 8 is provided on the downstream side fluid inflow side, so that the primary side fluid flows through the regulating body 7.
This prevents water from flowing through the cavity 9 from top to bottom. ,
In this embodiment, the fluid regulator 7 is held in contact with the tip of the fin 12.

1o is a primary fluid passage divided into many parts by fins 2 between the inner surface of the inner cylinder 1 and the fluid regulator 7, and both ends of the page are formed between the end 3 and the bottom 8. An inflow chamber 11 communicating with the primary side fluid inlet 6 and an end 4 and a flow regulator 7
It is open to an outflow chamber 12 communicating with a primary side fluid outflow port 6 formed between.

Reference numeral 13 denotes a spirally wound pipe serving as a secondary fluid passage, and is arranged so as to surround the outer circumference of the inner cylinder 1. 1
Reference numeral 4 denotes a secondary fluid inlet provided on the lower side of the pipe 13, and 16 represents a secondary fluid outlet provided on the upper side of the pipe 13. 16
is a heat conductor that is bonded to the outer circumference of the inner cylinder 1 in a layered manner, and a tube 13 is embedded inside thereof.

In the above configuration, in the case of a hot water supply heat exchanger that uses a refrigerant (e.g. Freon 22) as the downstream fluid and water as the secondary fluid, the water is heated by the high temperature gas refrigerant discharged from the refrigerant compressor. Explain.

As shown by the arrow in FIG. 1, the refrigerant in the form of a high-temperature gas flows from the primary fluid inlet 5 through the inflow chamber 11 into the primary fluid passage 10 divided into many parts, where the refrigerant flows through the inner surface of the inner cylinder, Fin 2. Heat is radiated to the water flowing through the V page tube 13 through the heat conductor 16, condenses and liquefies, and collects in the lower outlet chamber 12 as a low-temperature liquid through the PL-next fluid outlet 6.
More leakage. On the other hand, as shown by the white arrow, water flows into the secondary fluid inlet 14 provided at the bottom into the pipe 13, ascends spirally around the outer circumference of the inner cylinder, and is successively heated and heated by the high-temperature refrigerant. The water becomes high temperature water and flows out through the upper secondary fluid outlet 15.

In this way, the refrigerant flows vertically from the top to the bottom of the heat exchanger, so the liquid refrigerant condensed and liquefied due to heat radiation smoothly falls to the bottom. Therefore, the liquid film formed on the heat transfer wall during condensation can prevent an increase in thermal resistance due to an increase in the thin liquid film, thereby improving heat transfer performance.

In addition, the inner cylinder 1 can be manufactured by extrusion processing, and instead of being a cheap fin 9, it can be integrally molded with a large number of fine fins, so it has excellent heat conduction and a sufficiently large heat transfer area.
Furthermore, by setting the fin thickness, fin pitch, etc., the void serving as the primary fluid passage can be shaped to provide the most efficient heat transfer.

Furthermore, the pipe through which the secondary fluid flows and the inner cylinder are connected in close thermal contact with a thermal conductor made of a material with good thermal conductivity, so that the heat transfer resistance is reduced. In particular, the inner tube is an extruded product made of highly thermally conductive aluminum thread material, the thermal conductor is a highly thermally conductive cast aluminum alloy, and the cylinder and tube are joined by being cast inside the thermal conductor. Since the interface between the inner cylinder and the heat conductor is metallurgically bonded through a diffusion reaction, heat transfer resistance can be further reduced. In addition, when casting the inner cylinder and tube at the same time, if the v is placed so that it is in contact with the outer peripheral surface of the cylinder, it can be used as a presser for the inner metal tube (to prevent deformation of the tube due to the inflow of high temperature and high pressure molten metal) when casting the heat conductor. It also has the effect of being able to act.

As described above, according to the present invention, a fluid regulator with a bottom at least on the primary fluid inflow side is disposed in a cylinder whose inner surface is integrally formed by extruding a large number of fins, and between the inner cylinder and the fluid regulator. The void divided by the fins is the primary fluid passage,
The following ridged effect can be obtained by closely bonding all of the heat conductors with pipes embedded in the outer periphery of the cylinder that serve as secondary fluid passages.

1) - It is a heat exchanger with a safe structure that can ensure reliability in preventing mixing between the downstream fluid and the secondary side.

2) Enlarge the heat transfer area, optimize the shape of the downstream fluid passage, reduce heat transfer resistance, and use lightweight and highly thermally conductive materials to make it smaller, lighter, and more dense.

3) - The next fluid can flow vertically from top to bottom and has good heat transfer properties even in the case of condensed fluid.

The four inner cylinders are low cost and easily manufactured by extrusion.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a heat exchanger showing an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is an external perspective view of a conventional double-tube heat exchanger. , FIG. 4 is a sectional view taken along line BB in FIG. 3, and FIG. 5 is a sectional view of the triple tube heat exchanger. 1... Inner cylinder, 2... Fin, 7...
...Fluid regulation, 1o...-Next side: 'Fluid passage, 13
...Pipe, 16...Heat conductor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3

Claims (3)

[Claims] (1) A cylindrical inner cylinder whose inner surface is integrally formed with a large number of fins extending in the axial direction by extrusion processing is provided with a flow regulator with a bottom at least on the primary fluid inflow side, and both end faces of the inner cylinder The air gap divided by the fins between the inner cylinder and the fluid regulator is used as the primary fluid passage, and the annular heat conductor in which a spirally wound pipe is embedded is used as the secondary fluid passage. A heat exchanger connected to the outer periphery of the inner cylinder. (2) The heat exchanger according to claim 1, wherein the heat conductor is formed by casting, and the inner cylinder and the tube are joined by being cast inside the heat conductor. (3) The heat exchanger according to claim 1, wherein the inner cylinder is made of an aluminum-based material and the heat conductor is made of an aluminum casting alloy.