JP3340918B2 - Bayonet heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, and more particularly to a heat exchanger in which a supply / discharge pipe for a first fluid is disposed inside an inner pipe having a closed end, and an outer pipe surrounding the inner pipe is provided. ,
An annular gap between the first fluid supply / discharge pipe and the inner pipe,
The first fluid is an inner heat exchange path for the first fluid that passes in the direction of the core of the inner tube along the inner surface of the inner tube as a heat transfer surface, and an annular gap between the inner tube and the outer tube is provided. The second fluid flows along the outer surface of the inner tube and the inner surface of the outer tube as a heat transfer surface.
The present invention relates to a bayonet-type heat exchanger that forms a heat exchange path for a second fluid passing in the direction of the core of the pipe, and additionally forms an external heat exchange path for the first fluid outside the outer pipe.

[0002]

2. Description of the Related Art Conventionally, in this type of bayonet heat exchanger, as shown in Japanese Patent Application Laid-Open No. 58-158499 (see FIG. 4 ), a first fluid supply / discharge pipe 4 and an inner pipe 5 are connected. A plurality of three-tube assemblies with the outer tube 6 are arranged side by side in the container Y in a parallel posture, and the three-tube assemblies are distributed to opposing portions on the container wall in a posture along the tube core direction of the three-tube assembly. and outlet B and the inlet port a of the fluid W is provided, thereby, the inside of the container Y
Through the inlet A through the entire area between the outer tubes 6
The first fluid W passes toward the outlet B (in other words, three fluids W).
The first fluid W passes in a direction orthogonal to the tube core direction of the tube assembly
The outer heat exchange path r3 for the first fluid with respect to the outer tube 6 is formed as a whole in the container .

[0003]

However, in the above-mentioned conventional structure, however, the second fluid heat exchange path r2 between the first fluid inner heat exchange path r1 and the second fluid heat exchange path r2 having the inner tube 5 as a heat transfer wall is provided. Heat exchange between the first fluid W and the second fluid G (hereinafter abbreviated as inside heat exchange);
The first fluid W between the second fluid heat exchange path r2 having the outer tube 6 as a heat transfer wall and the first fluid outer heat exchange path r3 inside the container.
When heat exchange with the second fluid G is compared (hereinafter, abbreviated as outer heat exchange), the heat exchange efficiency in the outer heat exchange is considerably lower than the heat exchange efficiency in the inner heat exchange. However, there is a problem that the heat exchange efficiency is limited low.

[0004] In view of the above circumstances, a main object of the present invention is to effectively improve the heat exchange efficiency of this type of bayonet heat exchanger by rationally improving the flow path structure.

[0005]

According to the first aspect of the present invention, the first fluid supply / discharge pipe is inserted into an insertion hole formed in the enclosure member.
And a three-tube assembly consisting of an inner tube and an outer tube
As an outer heat exchange path for the first fluid to the annular gap between the inner and the outer tube of the insertion hole, in the annular gap, the tubes of the outer tube and along the outer tube outer surface of the first fluid as a heat transfer surface Since it passes in the core direction, the flow rate of the first fluid in the outer heat exchange path for the first fluid is increased as compared with the conventional heat exchanger as described above,
Heat transfer on the outer surface of the outer tube as a heat transfer surface can be promoted, and the first fluid can be prevented from passing without effectively contributing to heat transfer on the outer surface of the outer tube. As for the outer heat exchange, the same high heat exchange efficiency as the inner heat exchange can be secured, and the overall heat exchange efficiency can be effectively improved.

[0006] Further , an inner heat exchange passage for the first fluid and a second flow are provided.
Triple path of heat exchange path for body and outer heat exchange path for first fluid
Group, a plurality of outer heat exchange paths for the first fluid
Series communication that connects the annular gap with their ends
Connected in series, and thus, this series connection path
Supply of the first fluid from one end and discharge of the first fluid from the other end
The first fluid in each of the plurality of annular gaps
While passing through in the direction of the tube core,
Since the first fluid passes through the annular gap in series, the first fluid
The first for the same number of annular gaps as the outer heat exchange path for fluid
External heat exchange for the first fluid compared to passing fluids in parallel
Increase the flow velocity of the first fluid in each of the annular gaps as channels.
The heat on the outer surface of the outer tube as a heat transfer surface
Transfer can be more effectively promoted, and in this regard, heat exchange efficiency is improved.
This is effective when the upper part is particularly important.

[0007] In the above-mentioned triple road group, the first fluid
In a configuration in which annular gaps as outer heat exchange paths are arranged in parallel
When three or more of these annular gaps are connected in series,
One end of the annular gap as the outer heat exchange path for the first fluid
Between the serial communication passage on one end and the other end.
This is an alternate connection with the series communication path on the
Three or more annular gaps as outer heat exchange paths for the first fluid
Are connected in series to shorten the overall length of the serial communication passage.
This also makes it possible to simplify the structure.
You.

[2] According to the second aspect of the present invention, in order to secure a large heat exchange capacity by equipping a plurality of three-tube assemblies, three pipes are formed in each of the plurality of insertion holes formed in the block body as the enclosing member. Just by inserting and disposing the assembly, an annular gap as the first fluid outer heat exchange path can be formed between the inner surface of the insertion hole and the outer tube for each of the plurality of three-tube assemblies, Thereby, the assembly structure of the heat exchanger can be simplified, the production can be facilitated, and the apparatus cost can be reduced.

[0009]

FIG. 1 shows a reverse Stirling cycle.
Reference numeral 1 denotes a cylinder section in the refrigerator, 1 is a cylinder chamber which periodically repeats discharge and suction of a working gas G (for example, helium gas or hydrogen gas) with the reciprocating operation of the piston 2, and 3 is located on the head side of the cylinder chamber 1. The heat exchanger for heat absorption or heat radiation is provided continuously, and in the heat exchanger 3, heat is exchanged between the working gas G and the heat medium W (for example, water) in the cycle operation.

As shown in FIGS. 1 to 3, the heat exchanger 3 has a heat medium supply / discharge tube 4 (first fluid supply / discharge tube) having a distal end opening.
A concentric three-pipe assembly of an inner pipe 5 having a closed end with the heat medium supply / discharge pipe 4 inserted and disposed therein, and an outer pipe 6 with both ends open surrounding the inner pipe 5 is formed by a bayonet type And a bridging-shaped block body 9 having a plurality of insertion holes 8 formed inside a cylindrical case 7 connected to the head side of the cylinder chamber 1. The above-mentioned three-tube assembly is inserted and arranged, whereby, for each three-tube assembly, an annular gap between the heat medium supply / discharge tube 4 and the inner tube 5 is formed.
The heat medium W flows along the inner surface of the inner tube 5 as a heat transfer surface.
An inner heat exchange path r1 for the heat medium passing in the direction (inner heat exchange path for the first fluid), and an annular gap between the inner pipe 5 and the outer pipe 6 is formed by the working gas G as a heat transfer surface. A heat exchange path r2 (a second fluid heat exchange path) for working gas that passes along the outer surface of the tube and the inner surface of the outer tube in the direction of the cores of the inner tube 5 and the outer tube 6 is inserted into the outer tube 6. The annular space between the inner surface of the hole 8 and the heat medium W is formed by the heat medium W along the outer surface of the outer tube 6 as a heat transfer surface .
This is an outer heat exchange path r3 (first fluid outer heat exchange path) for the heat medium passing in the tube core direction . In other words, this structure
The inner heat exchange path r1 for the heat medium and the working gas
A heat exchange path r2 for heat transfer and an external heat exchange path r3 for heat medium.
A plurality of heavy paths are provided in a parallel arrangement.

As for a more specific structure, one end side outer tube support plate 1 for closing one end side of outer tube 6 between outer tubes 6 is provided.
0 is a closing member for one end side opening (opening opposite to the cylinder chamber) of the cylindrical case 7, and the one end side opening of each outer pipe 6 inserted through the insertion hole 8 by the one end side outer pipe support plate 10. The other end outer tube support plate that closes one end opening of the cylindrical case 7 and closes the outer tube 6 between the outer tubes 6 at the other end of the outer tube 6 in a state where it faces the outside of the cylindrical case 7. 11
To the other end of the cylindrical case 7 (opening on the cylinder chamber side)
With the other end side outer tube support plate 11, the other end side opening of each outer tube 6 inserted through the insertion hole 8 faces the inside of the cylinder chamber 1, and the other end of the cylindrical case 7 is closed. The end opening is closed.

When the inner tube 5 is inserted into the outer tube 6 in response to the closing of the case by the outer tube supporting plates 10 and 11, the inner tube 5 closes between the inner tubes 5 at the base end side of the inner tube 5. By attaching the support plate 12 to one end of the cylindrical case 7 in a state where the support plate 12 overlaps the one end side outer tube support plate 10,
Between this inner tube support plate 12 and one end side outer tube support plate 10,
A working gas header chamber 13 that opens one end side opening of each of the working gas heat exchange paths r2 is formed, and the working gas header chamber 13 is connected to a discharge / suction path 14 of the working gas G to the cylinder chamber 1.

That is, with this structure, the working gas
The heat exchange path r2 (the heat exchange path for the second fluid) will be described later.
Discharge from the cylinder chamber 1 to the working gas discharge suction passage 14
The working gas G to be discharged and the working gas discharge suction passage 14
The working gas G sucked into the cylinder chamber 1 is supplied to the inner pipe 5 and the outer pipe 6.
The working gas heat exchange path r formed by the annular gap between
2 pass in the direction of the cores of the inner pipe 5 and the outer pipe 6 (in other words,
If so, the inner tube 5 and the outer tube 6 are directed from one end to the other end or other
From the end to one end).

When the heat medium supply / discharge pipe 4 is inserted into the inner pipe 5, a supply / discharge pipe support for closing the heat medium supply / discharge pipes 4 at the base end side of the heat medium supply / discharge pipe 4 is provided. The plate 15 is connected to the inner tube support plate 1.
2 and attached to one end of the cylindrical case 7 to open the base opening of each of the heat medium inner heat exchange passages r1 between the supply / discharge tube support plate 15 and the inner tube support plate 12. A heat medium discharge side header chamber 16 to be formed is formed, and a cover plate 17 is attached to one end of the cylindrical case 7 so as to overlap the supply / discharge tube support plate 15 so that the cover plate 17 and the supply / discharge tube support plate 15 are attached. A heat medium supply side header chamber 18 for opening the base end opening of each of the heat medium supply / discharge pipes 4 is formed.

That is, with this structure, the inside of the heat medium
Regarding the heat exchange path r1 (the inner heat exchange path for the first fluid),
As will be described later, the heat medium supply to the heat medium supply side header 18 and the heat medium
With the discharge of the heat medium from the discharge side header chamber 16,
Heat medium formed by an annular gap between supply / discharge pipe 4 and inner pipe 5
The heat medium W in each of the inner heat exchange paths r1 in the direction of the core of the inner pipe 5.
(In other words, discharged from the end of the heat medium supply / discharge pipe 4)
Passing through the heat medium W from the distal end of the inner tube 5 toward the proximal end.
Let

On the other hand, inside the cylindrical case 7, one end opening and the other end opening of each annular gap as the heat exchange passage r3 for the heat medium are connected to the one end outer tube support plate 10 and the other end outside. Closed at the tube support plate 11 (Details at one end as described below)
Opening portions for the serial communication passages 19a and 19b on the other end side
To be closed) , while FIG. 2 and FIG.
As shown in FIG. 3, one end side serial communication passage 19a formed at one end side of the block body 9 so as to communicate one end of two adjacent annular gaps as the heat medium outer heat exchange path r3.
And the other end side serial communication passage 19b formed in the other end side of the block body 9 so that the other end portions of two adjacent annular gaps as the heat medium outer heat exchange path r3 communicate with each other. Thus, all of the annular gaps serving as the heat medium outer heat exchange path r3 are sequentially connected in series.

That is, in the triple road group, the outer tube
One outer tube supporting one end of the outer tube 6 to close between the outer tubes 6
By attaching the holding plate 10, the first fluid outer heat exchange path r
3. Connect one end of the adjacent annular gap as 3
One end side serial communication passage 19a is formed, and
The other end side outer tube support plate 1 that closes between the outer tubes 6 at the end side
With the attachment of No. 1, the first fluid outside heat exchange path r3
The other end that connects the other ends of all adjacent annular gaps
A serial communication passage 19b is formed, and the one end side serial communication
Alternate connection by the path 19a and the other end side serial communication path 19b)
A plurality of annular gaps as the first fluid outer heat exchange path r3
Are connected in series.

An annular gap is formed as an external heat exchange path r3 for the heat medium positioned at one end on the series connection path, through the one end side external communication path 20a formed at one end side of the block body 9 through the cylindrical case. External piping connection port 2 for heat medium formed in 7
1 and an annular gap as the heat medium outer heat exchange path r3 located at the other end on the series connection path via the other end side external communication path 20b formed at the other end side of the block body 9. , External piping connection port 2 for heat medium formed in cylindrical case 7
In this configuration, an external pipe 23 for supplying a heat medium is connected to one of the external pipe connection ports 21 and 22 for the heat medium and to each of the header chambers 18 on the heat medium supply side. The external pipe 2 for discharging the heat medium is connected to the other of the external pipe connection ports 21 and 22 for the medium and the heat medium discharge side header chamber 16 respectively.
4 are connected.

That is, with this structure, the outside for the heat medium
The heat exchange passage r3 (first fluid outside the heat exchange 換路)
As described later, to one of the external piping connection ports 21 and 22 for the heat medium.
With the supply of the heat medium and the discharge of the heat medium from the other,
For a heat medium formed by an annular gap between the inner surface of the insertion hole 8
Each of the outer heat exchange paths r3 (that is, one end side serial communication path 1)
9a and the other end side serial communication path 19b alternately connected in series.
The heat medium W is passed through the connected heat medium outer heat exchange paths r3).
Pass in the direction of the core of the outer tube 6 (in other words, one end of the outer tube 6
From the other end or from the other end to one end)
Let it.

In the figure, reference numeral 25 denotes a case inner region between the inner surface of the cylindrical case 7 and the outer surface of the block body 9 on the one end side external communication passage 20a side and the other end side external communication passage. An annular seal member for sealing between the inside of the case on the side of 20b.

That is, in the heat exchanger 3, the supply of the heat medium to the heat medium supply side header chamber 18 and the discharge of the heat medium from the heat medium discharge side header chamber 16 are performed by the heat medium supply / discharge pipe 4 and the inner pipe. 5, the heat medium W is passed in the tube core direction in each of the heat medium inner heat exchange paths r1, and the heat medium is supplied to one of the heat medium external pipe connection ports 21 and 22 and the heat medium is supplied from the other. With the heat medium discharge, the heat medium outer heat exchange path r3 between the outer tube 6 and the inner surface of the insertion hole 8.
The working gas G discharged from the cylinder chamber 1 to the working gas discharge / suction passage 14 and the working gas G sucked from the working gas discharge / suction passage 14 to the cylinder chamber 1 while allowing the heat medium W to pass in the tube core direction in each of the above. Is passed in the pipe core direction in each of the working gas heat exchange paths r2 between the inner pipe 5 and the outer pipe 6, whereby the working gas G passing through the working gas heat exchange path r2 is
With both the tube wall of the inner tube 5 and the tube wall of the outer tube 6 as heat transfer walls, the heat passing through the heat medium W through the inner heat exchange path r1 and the heat passing through the heat medium outer heat exchange path r3. Heat is exchanged with each of the media W.

[Another Embodiment] Next, another embodiment will be described. The present invention is not limited to heat exchangers for heat absorption and heat dissipation in reverse Stirling cycle refrigerators, and heat exchangers for heating and heat dissipation in Stirling cycle engines and heat exchange for various other uses. 1st heat exchanger
As the fluid and the second fluid, various fluids other than the heat medium W and the working gas G shown in the above-described embodiment can be adopted.

All the annular gaps serving as the outer heat exchange path r3 for the first fluid (the outer heat exchange path for the heat medium) are replaced with the above-described form in which all the annular gaps are connected in series.
Alternatively , a combination of a series connection and a parallel connection by the other end side serial communication path 19b may be adopted .

The first fluid supply / discharge pipe 4 (heat medium supply / discharge pipe) arranged inside the inner pipe 5 is a pipe on the side for supplying the first fluid to the inside of the inner pipe 5, or conversely, First from inside the inner tube 5
It may be any of the tubes on the fluid discharge side.

In the above-described embodiment, a block member 9 having a plurality of through holes 8 in a parallel posture is provided as a surrounding member surrounding the outer tube 6, and a first member is provided in each of the through holes 8.
By arranging the three-tube assembly of the fluid supply / discharge tube 4, the inner tube 5, and the outer tube 6, each of these three-tube assemblies is disposed between the inner surface of the insertion hole 8 and the outer tube 6. Although the structure in which the annular gap is formed as the one-fluid outer heat exchange path r3 has been described, a tubular enclosure member that individually surrounds the outer tube 6 in the three-tube assembly is provided. An annular gap may be formed between the outer pipe 6 and the outer pipe 6 as a first fluid outer heat exchange path r3 that allows the first fluid W to pass in the pipe core direction along the outer pipe outer surface.

Incidentally, reference numerals are written in the section of "Claims" for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment.

FIG. 2 is an end view of a block body showing the embodiment.

FIG. 3 is a partially cutaway side view of the block body showing the embodiment.

FIG. 4 is a longitudinal sectional view showing a conventional example.

[Explanation of symbols]

Reference Signs List 5 inner pipe 4 first fluid supply / discharge pipe 6 outer pipe W first fluid r1 first fluid inner heat exchange path G second fluid r2 second fluid heat exchange path r3 first fluid outer heat exchange path 9 enclosure Member, block body 8 Insertion hole 10 One end side outer tube support plate 11 One end side outer tube support plate 19a One end side series communication passage 19b Other end side series communication passage

Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F28D 7/10

Claims (2)

(57) [Claims] A first fluid supply / discharge pipe (4) is disposed inside an inner pipe (5) having a closed end, and an outer pipe (6) surrounding the inner pipe (5) is provided. An annular gap between the first fluid supply / discharge pipe (4) and the inner pipe (5) is formed by the first fluid (W) along the inner pipe inner surface as a heat transfer surface . An inner heat exchange passage (r1) for the first fluid passing in the tube core direction, wherein an annular gap between the inner tube (5) and the outer tube (6) is
A second fluid heat exchange path (G) through which the second fluid (G) passes along the outer surface of the inner tube and the inner surface of the outer tube as heat transfer surfaces in the tube core direction of the inner tube (5) and the outer tube (6). r2) In addition, a bayonet heat exchanger that forms an outer heat exchange path (r3) for the first fluid outside the outer pipe (6) is formed on the enclosure member (9). The first fluid is inserted into the insertion hole (8).
Between the supply / discharge pipe (4), the inner pipe (5) and the outer pipe (6).
The three-tube assembly is inserted and arranged, and the inner surface and front of the insertion hole (8)
The first fluid (W) is transmitted through the annular gap between the outer pipe (6) and the outer pipe (6).
Along the outer surface of the outer tube as the heating surface, in the direction of the core of the outer tube (6)
An outer heat exchange path (r3) for the first fluid passing therethrough, and an inner heat exchange path (r1) for the first fluid and the second fluid
Heat exchange path (r2) for the first fluid and an outer heat exchange path for the first fluid
A plurality of triple paths with (r3), and in this triple path group, an outer pipe is provided at one end of the outer pipe (6).
(6) One end side outer tube support plate (10) for closing the gap between the two
Is attached to the first fluid outer heat exchange path (r
3) Connect one end of adjacent annular gaps as
One end side serial communication path (19a) is formed, and
The other end of the outer tube (6) is closed between the outer tubes (6).
By attaching the other end side outer tube support plate (11), the first
Of the adjacent annular gap as the outer heat exchange path (r3) for fluid
The other end side serial communication passage (19b) for communicating the other ends.
Are formed, and the one end side serial communication passage (19a) and the other end side serial communication passage are formed.
(19b) the first fluid outer heat exchange by alternate connection
A plurality of annular gap is serially connected as換路(r3)
Bayonet heat exchanger with a structure . 2. The method according to claim 1, wherein the enclosing member includes a plurality of parallel postures.
The insertion hole block body formed of (8) (9) the set only with
Bayonet type heat exchanger of a claim 1, wherein.