JPH0611281A - Heat exchanger and heat transfer pipe - Google Patents

Abstract

PURPOSE:To enhance the productivity of heat transfer pipes, improve machining accuracy and reduce the number of the parts by providing a circular pipe body having the splits extending circumferentially in the opposite directions and the connecting pipes arranged near the splits in connection therewith and extending axially in the opposite directions. CONSTITUTION:A circular pipe body 12 is formed by simple bending of heat transfer units 11A, 11B and 11C into a circular shape and connecting pipes 14 are formed extending parallel to one another in the axial directions by bending axially in the opposite directions from the splits 13 of the circular pipe body 12. The pipe length of each of the heat transfer units 11A, 11B and 11C is determined by gaps between the splits 13 and the length of the connecting pipe 14. In other words, a generally circular pipe material is cut off from the split 13 and bent to form two connecting pipes 14 extending in the opposite directions. This permits the use of the supporting member, etc., having the same specifications in the heat transfer unit to reduce the number of parts.

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 its heat transfer tube.

[0002]

2. Description of the Related Art As one type of nuclear reactor, there is a high temperature gas reactor which uses helium as a heat medium. FIG. 7 shows a structural example of an intermediate heat exchanger used in a high temperature gas furnace. Figure 7
1, reference numeral 1 is a container body, 2 is a high temperature fluid inlet, 3 is a high temperature fluid outlet, 4 is a low temperature fluid inlet, 5 is a heat transfer tube, 5a is a helical coil section, 5b is a curved tube section, and 6 is a fluid collecting cylinder (inner (Cylinder), 7 is a low temperature fluid outlet, 8 is a heat insulating material, 9 is a header, 1
0 is a closure lid.

Then, a high-temperature fluid (high-temperature helium gas) generated in the high-temperature gas furnace is guided from the high-temperature fluid inlet 2 to the inside of the container 1 as shown by a dashed arrow in FIG. Heat exchange is performed by bringing the low temperature fluid out of the container 1 through the high temperature fluid outlet 3, and one of the low temperature fluids (helium gas in the low temperature state) is cooled by the low temperature fluid as shown by the solid line arrow in FIG. From the inlet 4, it is guided into a large number of heat transfer tubes 5, and the helical coil portion 5a and the curved pipe portion 5b
Through the fluid collecting cylinder 6 and the low temperature fluid outlet 7
I try to let it leak out.

[0004]

However, the helical coil portion 5a of the heat transfer tube 5 requires a highly accurate forming process in which the helical shape is set while controlling the diameter, the arc curvature, the spiral pitch, and the like. However, the difficulty of the molding processing technology is high, and when a plurality of heat transfer tubes 5 are connected in parallel in the axial direction and the radial direction, the management of manufacturing errors and the labor for correcting the coil shape become great. .

The present invention has been made in view of these circumstances, and it is an object of the present invention to improve the manufacturability of a heat transfer tube, improve the processing accuracy, and reduce the number of parts.

[0006]

In order to solve the above problems, the present invention adopts the following means. In the heat exchanger tube unit for a heat exchanger according to claim 1, an annular pipe body having a cut that separates in the circumferential direction,
A connecting pipe is provided in the vicinity of the break of the annular pipe body in a connected state and extends in a direction away from each other along the axial direction. In the heat exchanger tube assembly for the heat exchanger according to the second aspect, a plurality of heat exchanger tube units of the same type according to the first aspect are connected in series at the connecting pipe portion and assembled into a helical coil. In the heat exchanger tube assembly for heat exchangers according to claim 3, several heat exchanger tube units of the same type according to claim 1 are superposed in several layers in the axial direction, and are connected in series at the portions of each connecting tube to be in a parallel state. It is constructed by assembling in a helical coil shape. In the heat exchanger tube assembly for the heat exchanger according to the fourth aspect, the heat exchanger tube units having different diameters are assembled into helical coils and arranged concentrically. In the heat exchanger according to claim 5,
The heat transfer chamber in the container body contains the heat transfer tube assembly according to claim 2, 3 or 4.

[0007]

In the heat transfer tube unit for a heat exchanger according to claim 1, an annular pipe body is provided by forming a pipe material into an annular shape, and a connecting pipe is erected from near the cut along the axial direction. By raising it, it can be used for connection with the same type of heat transfer tube unit and other piping. In the heat exchanger tube assembly for a heat exchanger according to claim 2, a plurality of heat exchanger tube units of the same type are prepared, and the lengths of the heat exchanger tubes are set by connecting in series at the connecting tube portion. , Assembled into a helical coil as a whole. In the heat exchanger tube assembly for heat exchangers according to claim 3, a plurality of heat exchanger tube units of the same type are stacked in a plurality of layers in the axial direction so that the plurality of heat exchanger tube units are in a parallel state, and the plurality of heat exchanger tube units are connected to each other. When connected in series, the heat transfer tubes are assembled into a parallel helical coil. In the heat exchanger tube assembly for the heat exchanger according to the fourth aspect, a plurality of kinds of heat exchanger tube units having different diameters are assembled into a helical coil shape and combined to form a concentric arrangement. In the heat exchanger according to claim 5, the heat transfer tube assembly according to claim 2, 3 or 4 is housed in the heat exchange chamber in the container body, whereby a desired heat transfer tube having a substantially cylindrical shape is formed. Heat exchange is performed by.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the heat exchanger and its heat transfer tube according to the present invention will be described below with reference to FIGS.

1 to 4, reference characters A, B and C
Is a heat transfer tube assembly for heat exchanger (heat transfer tube assembly), 11A,
11B and 11C are heat transfer tube units for heat exchangers (heat transfer tube units), 12 is an annular pipe body, 13 is a cut, 14 is a connecting tube, 15 is a welded joint, 16 is a heat exchange chamber, 17 is an upper connecting tube, and 18 is It is a lower connecting pipe.

Heat transfer tube units 11A, 11B, 11C
Is formed by simply bending the pipe material into an annular shape to form a portion of the annular pipe body 12.
By bending in a direction away from the cut 13 along the axial direction (hereinafter, the central axis direction is referred to as an annular direction with respect to the annular shape), the connecting pipe 14 in a state of being extended parallel to the axial direction is obtained. It is formed.

Each heat transfer tube unit 11A, 11B, 11C
The length of the pipe is set by the distance L between the cuts 13 and the length T of the connecting pipe 14. In the example shown in FIGS. 1 to 3, the heat transfer tube units 11A, 11B and 11C of the same type are
Since the four pipes are arranged in the axial direction in a parallel state (stacked state), the interval L between the cuts 13 is approximately 2 of the length T of the connecting pipe 14.
Has doubled. In other words, by cutting the pipe material that is roughly annular from the cut 13 and bending it, two connecting pipes 14 having a length T that are separated from each other are formed.
Is formed.

The heat transfer tube units 11A, 11B, 11C
Usually, as shown in FIGS. 1 and 3, by stacking the same types along a cylindrical surface and forming a welded joint 15 by welding the abutting portions of the connecting pipes 14 in the circumferential direction, They are connected in series and assembled into a shape similar to a helical coil.

Heat transfer tube units 11A, 11B, 11C
Can be connected in parallel for the same type to flow a fluid. That is, as shown in the development view of FIG. 4, the annular pipe bodies 12 of the heat transfer tube unit 11A of the same type are stacked in axial layers at, for example, four layers, and the connecting pipe 14 is formed.
In the state that the part of is shifted in the circumferential direction, each connecting pipe 1
By connecting 4 in series, the parallel-helical-coil heat exchanger tube assembly A for heat exchangers is formed.

Further, the heat exchanger tube assemblies A, B and C for heat exchangers of different types (different diameters) can be arranged concentrically. As shown in FIG. 2, the heat transfer tube assemblies A, B, and C for a heat exchanger assembled in a substantially cylindrical shape are combined with each other to be arranged in a concentric shape.

Such heat transfer tube units 11A, 11
For B and 11C, many of the same model have been manufactured,
As the heat transfer tube assemblies A, B, and C in which a plurality of series, parallel, and concentric circle arrangement states are combined by forming the welded joint 15, the heat transfer tube specifications are made to correspond to the target heat transfer tube specifications, and as shown in FIG. 1 into the heat exchange chamber 16 inside,
By connecting each connection pipe 14 located at the top to the header 9 via the upper connection pipe 17, and connecting each connection pipe 14 located at the bottom to the fluid collecting cylinder 6 via the lower connection pipe 18, As a heat exchanger, it exhibits the same function as that of the above-mentioned intermediate heat exchanger.

Explaining the heat exchanging action, the high temperature fluid is introduced from the high temperature fluid inlet 2 into the inside of the container body 1 as shown by the broken line arrow in FIG.
Heat exchange is performed by contacting C with the hot fluid outlet 3 to flow out of the container main body 1. One of the cold fluids is supplied to the header 9 of the cold fluid inlet 4 as shown by a solid arrow in FIG. From a large number of heat transfer tube units 11A, 11B,
It is introduced into 11C, merged in the fluid collecting cylinder 6, and discharged from the low temperature fluid outlet 7.

In this case, each heat transfer tube unit 11
In A, 11B and 11C, the annular pipe body 12 and the connecting pipe 1
Although there is a tendency that the resistance is slightly increased by changing the flow path at the bent portion with 4, the heat transfer tube units 1
The supporting structures such as the steady rests of 1A, 11B, and 11C can be simplified and shared by the annular pipe body 12 having an arc shape.

On the other hand, FIG. 5 shows each heat transfer tube unit 11A,
It shows another example of the joint portion of the connecting pipe 14 in 11B and 11C, and is connected by a socket 19 and a welded joint 15.

Further, FIG. 6 shows each heat transfer tube unit 11A,
11B shows another example of connection of 11C and 11C.
Is bent in the outer radial direction and the axial direction to make the connection.

[0020]

According to the heat transfer tube unit for a heat exchanger of the first aspect of the present invention, since the annular pipe body is formed by the bending process of bending the pipe material in an annular shape, compared with the case where the pipe material is bent in a spiral shape. The manufacturability can be improved and the processing accuracy can be improved. According to the heat transfer tube assembly for a heat exchanger of claim 2, since a plurality of heat transfer tube units of the same type are manufactured and these are connected in series to assemble the whole, the heat transfer tube has a cylindrical shape. The heat transfer tube length can be freely set by series connection, and the shape of the heat transfer tube unit is simple on the same plane. It is possible to reduce the number of parts by making the support and the like have the same specifications. According to the heat exchanger tube assembly for a heat exchanger according to claim 3, since the heat exchanger tube units are arranged in parallel in a plurality of layers and are connected in series, variations in the shapes and intervals of the heat exchanger tube units between the plurality of layers are reduced,
The thermal efficiency can be made uniform. Also in this case, it becomes possible to easily support the heat transfer tube units of a plurality of layers by the support having the same specifications. According to the heat transfer tube assembly for heat exchangers of the fourth aspect, since each heat transfer tube unit has a cylindrical inner and outer surface having the same diameter, axial combination and attachment / detachment workability are improved, and a plurality of heat transfer tube units are attached. A heat exchanger in which heat transfer tubes are connected in parallel can be easily manufactured. According to the heat exchanger of the fifth aspect, the heat exchange chamber in the container body has the heat transfer tube assembly of the second, third or fourth aspect accommodated therein. The desired characteristics can be obtained by assembling the heat transfer tube assembly corresponding to the above. Moreover, the number of manufacturing steps of the heat exchanger can be remarkably reduced as compared with the conventional complicated helical coil-shaped heat transfer tube.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of a heat exchanger and a heat transfer tube thereof according to the present invention.

FIG. 2 is a partially sectional plan view showing an embodiment of the heat exchanger and the heat transfer tube thereof according to the present invention.

FIG. 3 is a front view showing a connection state of the heat transfer tube unit for the heat exchanger according to the present invention.

FIG. 4 is a development view of the heat transfer tube assembly for the heat exchanger shown in FIG.

FIG. 5 is a partially sectional front view showing another example of the joint of the heat exchanger tube unit for heat exchanger according to the present invention.

FIG. 6 is a partially omitted perspective view showing another connection example of the heat exchanger tube unit for the heat exchanger according to the present invention.

FIG. 7 is a front cross-sectional view showing a structural example of an intermediate heat exchanger used in a high temperature gas furnace.

[Explanation of symbols]

1 Container (Container Main Body) 2 High Temperature Fluid Inlet 3 High Temperature Fluid Outlet 4 Low Temperature Fluid Inlet 6 Fluid Collecting Cylinder 7 Low Temperature Fluid Outlet 9 Header A, B, C Heat Exchanger Tube Heat Exchanger Assembly (Heat Transfer Tube Assembly) 11A, 11B, 11C Heat Transfer Tube Unit for Heat Exchanger (Heat Transfer Tube Unit) 12 Annular Pipe Body 13 Break 14 Connection Pipe 15 Weld Joint 16 Heat Exchange Chamber 17 Upper Connection Pipe 18 Lower Connection Pipe 19 Socket

Claims (5)

[Claims] 1. An annular pipe body having a circumferentially-separated cut, and a connecting pipe disposed in a connected state in the vicinity of the cut of the annular pipe body and extending in a direction away from each other along the axial direction. A heat transfer tube unit for a heat exchanger, which is characterized in that 2. A heat transfer tube assembly for a heat exchanger, characterized in that a plurality of heat transfer tube units of the same type according to claim 1 are connected in series at a connecting tube portion and assembled into a helical coil shape. 3. A plurality of heat transfer tube units of the same type according to claim 1, which are stacked in several layers in the axial direction, are connected in series at the portions of each connecting tube, and are assembled in a helical coil shape in a parallel state. A heat transfer tube assembly for a heat exchanger. 4. The heat transfer tube assembly for a heat exchanger according to claim 2, wherein the heat transfer tube units having different diameters are assembled into a helical coil shape and arranged concentrically. 5. The heat exchange chamber in the container body is provided with the heat exchanger according to claim 2,
Alternatively, a heat exchanger comprising the heat transfer tube assembly described in 4.