JPH03225196A - Heat exchanger - Google Patents

Abstract

PURPOSE:To miniaturize the height of a heat exchanger, facilitate the manufacture of the same and reduce the cost of the same by making a passage, through which heat transfer medium flows, so as to have an annular configuration having a long axis and enlarging a ratio of a transversal size to a lateral size. CONSTITUTION:A cylinder 22 is constituted of an inner cylindrical body 27 and an outer cylindrical body 28, a passage 21 is formed around the inner cylindrical body 27 between the inner cylindrical body 27 and the outer cylindrical body 28 and one end of the passage 21 is sealed tightly by a lid 29 connected to the inner cylindrical body 27 and the outer cylindrical body 28 while the other end of the passage 21 is sealed by lids 30, 31 under a condition that the uppermost part and the lowermost part are opened. According to this method, the inner cylindrical body 27 is connected to the outer cylindrical body 28 through the lids 29, 30, 31. An inflow port 32, communicated with the passage 21 and the supplying pipeline 2b of a heat pipe 2 is connected to the inner cylindrical body 27 and the outer cylindrical body 28 at the uppermost part of the passage 21. The cylindrical body 22 is constituted of the combination of the inner and outer cylindrical bodies 27, 28 in such a manner whereby the passage 21 becomes annular. According to this method, the height of a heat exchanger can be reduced without reducing the heat transfer area of the heat exchanger.

Description

DETAILED DESCRIPTION OF THE INVENTION [Structure of the Invention] (Industrial Application Field) The present invention relates to a heat exchanger used in a loop-type heat pipe heat transport system and the like.

(Prior art) Conventionally, this type of heat exchanger is disclosed in Japanese Patent Application Laid-Open No. 1-1070.
The one shown in Japanese Patent No. 95 is known. This is called a vertical multi-tube header type, in which the upper header and lower header are connected by a plurality of straight pipes to form a first passage through which the heat transfer medium flows, and the heat transfer medium flows around this first passage. A second flowing passage was formed, and heat was transferred from the heat transfer medium to the heat transfer medium due to the proximity of the heat transfer medium and the heat transfer medium.

(Problems to be Solved by the Invention) By the way, in order to apply the loop-type heat pipe heat transport system using the heat exchanger described above to a hot water supply system for home or office use, the installation space is required.

For assembly, it is required to reduce the size and thickness, especially the height dimension, from the viewpoints of performance and design.

However, in the above-mentioned heat exchanger, in order to maintain the heat exchange performance required for the hot water supply system, it is important to increase the heat transfer area, that is, the height of the straight pipes extending vertically. It was thought that miniaturization in the height direction would be difficult.

Therefore, the technical object of the present invention is to provide a compact heat exchanger suitable for a hot water supply system that can maintain sufficient heat exchange performance.

[Structure of the invention]

(Means for Solving the Problems) The technical means taken in the present invention to solve the above-mentioned technical problems includes: an inner cylindrical body having a central space; an outer cylindrical body having substantially the same axial length as the inner cylindrical body and forming a first annular space between the inner cylindrical body and the inner cylindrical body;
a first passage into which a heat transfer medium flows, which is formed by closing both ends of the first annular space with a first lid body; and a heat transfer medium inflow pipe installed in communication above the first passage. , said first
A heat transfer medium discharge pipe installed in communication with the lower part of the passage;
a cylindrical body having an axial length exceeding the axial length of the outer cylindrical body, which is disposed so as to surround the outer periphery of the cylindrical body and forms a second annular space between the cylindrical body and the outer cylindrical body; A second passage into which a heat transfer medium flows, which is formed by closing both ends with a second lid body and formed by the second annular space and the central space, is installed in communication with one end of the second passage. The heat transfer medium inlet pipe has a heat transfer medium inflow pipe, and a heat transfer medium discharge pipe installed in communication with the other end of the second passage.

(Operation) The above technical means operates as follows. The first passage through which the heat transfer medium flows has an annular shape with a long axis.

This makes it possible to widen the heat transfer area without using a multi-tube type as in the past, and since the vertical and horizontal dimension ratio is large, it can be installed horizontally, that is, with the axial direction being the horizontal direction, and can be used as a vertical multi-tube header type. The height dimension can be made smaller in comparison. As a result, it is possible to provide a compact heat exchanger that maintains the height dimension while having sufficient heat exchange performance.

(Example) Hereinafter, one example of the present invention will be described based on the accompanying drawings.

As shown in FIG. 1, the hot water supply system 1 includes an evaporation section 1
0 and a condensing section 20 disposed above the evaporating section 10, the evaporating section 10 and the condensing section 20 form a closed loop with a heat vib 2 in which a working fluid, which is a heat transfer medium, is sealed inside. A bypass pipe in which a water supply source 3 of water, which is a heat transfer medium, is circulated through a condensing section 20 through a pipe 4 and connected to an outlet 5, and the water supply source 3 is branched from a supply pipe line 4b of the pipe 4. It is configured to be connected to the discharge pipe line 4a of the pipe 4 via a line 4C. A flow rate control valve 6 is disposed in the exhaust pipe 2a of the heat vibrator 2 to adjust the flow rate of the working fluid from the condensing part 20 to the evaporating part 10 based on the water supply temperature, hot water temperature, steam temperature, etc. At the connection between the discharge pipe 4a and the bypass pipe 4C, there is a thermostatic automatic valve or a thermostatic automatic valve that adjusts the temperature of the hot water based on the flow rate from the condensing section 20 to the tap water outlet 5 and the flow rate from the bypass pipe line 4c to the tap water outlet 5. A mixing valve 7 such as a two-valve manual valve is provided.

With the above configuration, the working fluid whose flow rate is adjusted by the flow rate control valve 6 is vaporized in the evaporator 10 and becomes high-temperature steam, which flows into the condensing unit 20 via the supply pipe line 2b of the heat vibe 2. In the condensing section 20, heat is exchanged with the supply water flowing in through the supply pipe 4b, and the working fluid is condensed and liquefied. Thereafter, the high temperature supply water is guided to the mixing valve 7 via the drain pipe 4a, adjusted to an appropriate temperature by the mixing valve 7, and discharged from the hot water supply port, and the working fluid is evaporated via the drain pipe 2a. We are led to part 10.

Next, the configuration of the evaporation section IO will be explained.

As shown in FIG. 1, a lower header 11 connected to the drain pipe 2a via an inlet 18 and an upper header 12 connected to the supply pipe 2b via an outlet 19 extend in the vertical direction. A vertical multi-tube header type evaporative heat exchanger 14 is constructed by connecting a large number of straight pipes 13. Behind this evaporative heat exchanger 14, there is a metal plate integrally with or in contact with the evaporative heat exchanger 14.

A sensible heat storage body 15 made of ceramic or the like is disposed, and an electric heater 16 that is controlled to be heated by late-night electricity is disposed on this heat storage body 15.

The evaporative heat exchanger 14 and the heat storage body 15 are covered with a heat insulating body 17. In the evaporator 10 configured as described above, the working fluid is converted into high-temperature steam by the heat heated by the electric heater 16 and stored in the heat storage body 15 .

Next, the condensing section 20 will be explained.

As shown in FIGS. 1 to 3, the condensing section 20 is
A body 22 (shown in the fourth figure) that communicates with the heat vibrator 2 and forms a passage 21 through which the working fluid flows; and a cylindrical body 25 (shown in the eighth figure) that communicates with the piping 4 and forms passages 23 and 24 into which water supply flows. The condensing heat exchanger 60 is composed of
This condensing heat exchanger 60 is covered with a heat insulator 26.

As shown in FIGS. 2 to 7, the body 22 includes an inner cylindrical body 27 made of copper alloy or the like with good thermal conductivity, and a heat exchanger disposed so as to enclose the inner cylindrical body 27. The outer cylindrical body 28 is made of a copper alloy or the like having good conductivity. A passage 21 is formed around the inner cylinder 27 between the inner cylinder 27 and the outer cylinder 28, and one end of this passage 21 is sealed by a lid 29 joined to the inner cylinder 27 and the outer cylinder 28. The other end is the top and bottom (5th
It is sealed with a lid 30° 31 in an open state (in the left-right direction in the drawing). As a result, the inner cylindrical body 27 and the outer cylindrical body 28 are joined via the lids 29, 30, 31. At the top of the passage 21, an inlet 32 communicating with the passage 21 and the supply pipe line 2b of the heat vibrator 2 is joined to the inner cylinder 27 and the outer cylinder 28. Further, at the lowest part of the passage 21, there is a discharge pipe 2 that communicates with the passage 21 and of the heat vibrator 2.
A discharge port 33 communicating with a is joined to the inner cylindrical body 27 and the outer cylindrical body 28.

As shown in FIGS. 2, 3, and 8, the cylinder 25
a cylindrical portion 34 disposed to enclose the outer cylindrical body 28 and forming a passage 24 around the outer cylindrical body 28;
The fuselage 2 is disposed at one end of the fuselage 22 and joined to the cylindrical part 34.
2 and a lid part 36 forming a passage 35 communicating with the passage 24. A discharge port 37 that communicates with the passage 35 and the discharge pipe line 4a of the pipe 4 is connected to the upper part of the lid part 36 (upper part in the second figure). A coil 38 is spirally wound around the outer periphery of the outer cylindrical body 28 , and is in contact with the inner circumferential surface of the cylindrical portion 34 to close the passage 24 .
is in a spiral shape.

As shown in FIGS. 2, 3, and 9, the inner cylinder 2
A cylindrical tube 39 is disposed inside the tube 7 , and a passage 23 is formed around the tube 39 between it and the inner cylinder body 27 . A passage 40 is formed in this tube 39, and this passage 40 communicates with the passage 23 through a hole 41 formed at one end of the tube 39, and through an inlet 42 connected to the other end of the tube 39, the passage 40 communicates with the passage 23 through a hole 41 formed at one end of the tube 39. It communicates with the supply pipe line 4b. Further, fins 43 are provided around the outer circumference of the tube 39.
is spirally wound, and contacts the inner circumferential surface of the inner cylinder 27 to form the passage 23 in a spiral shape.

As shown in FIGS. 2 and 7, a lid 44 is disposed at the other end of the body 22 and is connected to the inlet 32, 42 and the outlet 33, and is connected to one end of the body 22. aisle 23
．． A passage 45 communicating with 24 is formed. Also, the second
As shown in the figure and FIG.
．． 46 and 48 are joined together. Also, the cylindrical part 3
Flange portions 49 and 50 are joined to the outer peripheries of 4 and lid body 44, respectively. With this structure, the body 22 has an inner cylindrical body 2
7 is held in the cylinder body 25 by being fitted into the mounting member 46, the tube 39 is held in the cylinder body 25 by being fitted in the mounting member 47, and the lid body 44 is held in the cylinder body 25 by being fitted in the mounting member 47.
The flange portion 49. It is held via the sealing member 52 by being fastened with the bolt 51 at go.

Thereby, the condensing section 20 is configured. In this way, the condensing section 20 is connected to the body 22 . Since it is composed of a combination of the cylindrical body 25 and the tube 39, it is easier to manufacture than the conventional vertical multi-tube header type heat exchanger, and the number of parts and joints are significantly reduced, resulting in low cost. Cost reduction can be achieved. Furthermore, the fuselage 22. The cylinder body 25 and tube 39 are removed by removing the bolt 51 and attaching the mounting member 46.4.
7 can be easily disassembled by simply unfitting the fuselage 22. Inspection, replacement, cleaning, etc. of the inside of the cylinder body 25 and tube 39 can be easily performed.

Next, the operation of the condensing section 20 will be explained in conjunction with the explanation of the operation of the hot water supply system 1.

In FIGS. 1 to 3, the working fluid that has become high-temperature steam flows from the supply pipe line 2b of the heat pipe 2 into the passage 21 via the inlet 32, and the low-temperature supply water flows into the supply pipe line 2b of the pipe 4. flows into the passage 40 via the inlet 42,
It flows from the hole 41 in the order of passage 23°45.24.35.

At this time, the working fluid that has become high-temperature steam condenses and liquefies on the low-temperature heat transfer surfaces (wall surfaces of the inner cylinder 27 and outer cylinder 28), and the feed water receives the latent heat of condensation of the working fluid and rises in temperature, causing operation. Heat exchange occurs between the fluid and the feed water. After this, the working fluid is
, B, it travels along the heat transfer surface and accumulates in the 0 part, is discharged from the discharge port 33, and flows into the discharge conduit 2a of the heat pipe 2.

At this time, since the condensing heat exchanger 60 is inclined 5 degrees to 30 degrees with the discharge port 33 tilting downward as shown in FIG. can improve circulation performance. In addition, the heated supply water is discharged from the discharge port 37 and is discharged from the discharge pipe 4 of the pipe 4.
flows into a. Note that the discharge port 37 is located at the top of the condensing heat exchanger 60, and the above-mentioned mixing valve 7 is provided on the discharge pipe line 4a to have a stop structure. It can have a hot water storage function and improve the initial hot water supply performance. In addition, the flow in the water supply passages 23° and 24 is narrowed by the fins 43 and coils 38, and is restricted in one direction, creating a spiral shape with high flow velocity and turbulence. The flow flows evenly over the entire surface without stagnation. As a result, it is possible to maintain good heat exchange performance, and to remove air mixed in the water supply, dissolved gas separated by heating, etc. to the exhaust port 37.
It can be extruded more quickly, and the heat exchange performance can be prevented from being inhibited by these stagnations. Furthermore, since the heat exchanger 60 is constructed by a combination of the body 22 and the cylinder 25, that is, a combination of cylindrical shapes, it can easily respond to changes in the required heat exchange amount simply by expanding and extending it in the axial direction. Since the internal pressure from the working fluid side and the water supply side is received by the curved surface, the pressure resistance is high.Furthermore, since the body 22 is held only by the mounting member 46 and can slide in the axial direction, the body 22 side and It is possible to absorb the stress due to the difference in thermal expansion with the cylinder 25 side, and it is possible to prevent damage over time.

As described above, the body 22 has an inner cylinder body 27 and an outer cylinder body 28.
Since the passage 21 through which the working fluid flows has an annular shape. Thereby, the height dimension can be reduced without reducing the heat transfer area, sufficient heat exchange performance can be maintained, and the condensing heat exchanger 60 can be downsized. In other words, by downsizing the heat exchanger 60, the height from the outlet 33 of the condensing section 20 to the inlet 18 of the evaporating section 10 can be taken as the maximum source.
The circulation performance of the working fluid can be maintained at a high level.

Although this embodiment has been described in terms of a heat exchanger that involves a relative change in the working fluid from gas to liquid, the present invention can also be applied to a heat exchanger that does not involve a relative change in the working fluid.

〔Effect of the invention〕

The present invention provides an inner cylindrical body having a central space, and a substantially coaxial axis with the inner cylindrical body that is arranged to surround the outer periphery of the inner cylindrical body and forms a first annular space between the inner cylindrical body and the inner cylindrical body. a long outer cylindrical body, a first passage into which a heat transfer medium flows, which is formed by closing both ends of the first annular space with a first lid body, and is installed in communication above the first passage. between the heat transfer medium inflow pipe, the heat transfer medium discharge pipe installed in communication with the lower part of the first passage, and the outer cylindrical body, which is arranged so as to surround the outer periphery of the outer cylindrical body. a cylindrical body whose axial length exceeds the axial length of the outer cylindrical body forming a second annular space; the second annular space formed by closing both ends of the cylindrical body with a second lid body; a second passage into which the heat transfer medium flows, the second passage comprising a central space; a heat transfer medium inflow pipe installed in communication with one end of the second passage;
Since the heat exchanger is configured by having a heat transfer medium discharge pipe installed in communication with the other end of the passage, the first passage can be annular and have a large length-to-width dimension ratio, and can be placed horizontally. As a result, the height dimension can be reduced without reducing the heat transfer area compared to a vertical multi-tube header type heat exchanger. This makes it possible to reduce the height of the heat exchanger while maintaining sufficient heat exchange performance. Also, an inner cylinder body, 5
Since it is composed of a combination of an outer cylinder and a cylindrical body, that is, a combination of cylindrical shapes, it can easily respond to changes in the required heat exchange amount by simply expanding and extending it in the axial direction, and has a high pressure resistance, making it easy to manufacture. Therefore, it is possible to obtain a heat exchanger with reduced cost.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a hot water supply system using a heat exchanger according to the present invention, FIG. 2 is a cross-sectional view of the heat exchanger according to the present invention, FIG. Figure 4 is a sectional view of the fuselage, Figure 5 is a view taken in the direction of arrow V shown in Figure 3, and Figure 6 is a view taken in the direction of arrow V shown in Figure 5.
7 is a partial sectional view of the body with the lid attached, FIG. 8 is a sectional view of the cylindrical body, and FIG. 9 is a plan view of the tube. 21...Aisle (first aisle). 23.24... Passage (second passage). 25... Cylindrical body. 27...Inner cylindrical body. 28...Outer cylindrical body. 29.30.31... Lid (first lid body). 36... Lid (second lid). 44... Lid body (second lid body). 32...Inflow port (heat transfer medium inflow pipe). 33...Discharge port (heat transfer medium discharge pipe). 37...Discharge port (heat transfer medium discharge pipe). 42...Inflow port (heat transfer medium inflow pipe).

Claims (1)

[Claims] an inner cylinder having a central space; and an outer cylinder having approximately the same axial length as the inner cylinder, which is arranged to surround the outer periphery of the inner cylinder and forms a first annular space between the inner cylinder and the inner cylinder. a first passage into which a heat transfer medium flows, which is formed by closing both ends of the first annular space with a first lid body, and a heat transfer medium installed in communication above the first passage. A second heat transfer medium discharge pipe is provided between the inflow pipe, a heat transfer medium discharge pipe installed to communicate with the lower part of the first passage, and the outer cylindrical body and is disposed so as to surround the outer periphery of the outer cylindrical body. A cylindrical body whose axial length exceeds the axial length of the outer cylindrical body forming an annular space, and the second annular space and the central space formed by closing both ends of the cylindrical body with a second lid body. a second passage into which a heat transfer medium flows; a heat transfer medium inlet pipe installed in communication with one end of the second passage; and a heat transfer medium inlet pipe installed in communication with the other end of the second passage; A heat exchanger having a heat medium discharge pipe.