JP2010169343A - Reciprocating heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein in a reciprocating heat exchanger using a conventional technology, complicated component shapes make it difficult to enhance productivity, increased dead volume which is not involved in operation makes it difficult to reduce the size and it is difficult to prevent thermal coupling of working fluid between the inflow side and the outflow side. <P>SOLUTION: This reciprocating heat exchanger includes: a housing 10 having a distribution space 11 connected to the inflow port 10a and the outflow port 10b of working fluid; a plurality of heat transfer pipes 30 having one ends closed and the other ends connected to the housing 10; and partition plates 20 for dividing the inside of the heat transfer pipes 30 into going routes and return routes. Base bottom parts of the adjacent partition plates 20 are interconnected by a partition wall 21 formed of a continuous face approximately in parallel with the central axis of the heat transfer pipe 30, and the partition wall 21 divides the distribution space 11 into an inflow space 11 and an outflow space 11b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reciprocating heat exchanger using a plurality of heat transfer tubes whose ends are closed, and more particularly to a structure for easily realizing an increase in heat exchange area and improvement in productivity and maintainability.

In heat exchangers that transfer heat between the working fluid inside the heat transfer tube and the outside, the challenge is how to reduce the flow rate with a small flow resistance while increasing the heat exchange area related to heat transfer. Therefore, it is common to arrange and connect a large number of thin tubes in series or in parallel.
Also, it may be necessary to bring the working fluid forward and return paths on the same surface for reasons of layout, etc., so that many heat transfer tubes can be connected to the folded space or a U-shaped bent heat transfer tube can be used. The structure used is known. However, the heat exchanger of this structure is difficult to process, and is liable to adhere to foreign matter, and the maintainability such as cleaning when adhering is extremely low.

In order to improve the maintainability, a double pipe structure is formed so as to form a reciprocating path inside the heat transfer tube as a free end with one end of the heat transfer tube closed, or a partition plate 20 is provided as illustrated in FIG. A reciprocating heat exchanger that forms a reciprocating path has been proposed.

  However, in the prior art illustrated in FIG. 7, the heat transfer tube 30 is partially cut out, and the tube plate 81 requires a special half-moon-shaped hole shown in the arrow view of FIG. Even during assembly, the relative positions and directions of the respective parts must be strictly matched, and it is difficult to increase productivity.

  In addition, since the inflow space 11a and the outflow space 11b are stacked, this hinders miniaturization. In addition, the tube plate 81 has to have a large area, and therefore, between the working fluid on the inflow side and the outflow side. It was difficult to reduce the thermal coupling that is undesirable in terms of heat exchange efficiency.

Japanese Utility Model Publication No. 6-84170

  As described above, in the reciprocating heat exchanger according to the prior art, the shape of the parts is complicated, it is difficult to increase productivity, the dead volume regardless of the operation is increased, and the miniaturization is difficult. It is a problem to be solved by the present invention that it is difficult to prevent undesirable thermal coupling.

  In order to solve the above problems, a housing having a distribution space connected to an inlet and an outlet of a working fluid, a plurality of heat transfer tubes having one end closed and the other end connected to the housing, and a forward path through the heat transfer tube In the reciprocating heat exchanger having a partition plate that is divided into a return path, the base portion of the adjacent partition plate is connected by a partition wall formed of a continuous surface substantially parallel to the central axis of the heat transfer tube, and the partition wall portion is the distribution space. Is characterized in that it is divided into an inflow space and an outflow space.

  Further, the means for connecting the base portions of the adjacent partition plates is configured to include a movable portion that allows a small change in the relative position between the partition plates, thereby reducing the required accuracy of each component and expanding due to temperature changes. It is also possible to prevent the generation of excessive stress due to.

  Since the heat exchanger of the present invention is configured as described above, it is possible to configure a reciprocating heat exchanger with only parts having a very simple shape, and it is easy to manufacture and assemble parts in addition to the above maintainability. Productivity can be increased.

FIG. 1 is an explanatory diagram of Embodiment 1 in which the present invention is applied to a Stirling engine. FIG. 2 is an exploded view for explaining the assembly structure of the first embodiment. FIG. 3 is a cross-sectional view showing the AA cross section shown in FIG. FIG. 4 is an explanatory view of a second embodiment in which the present invention is applied to an exhaust heat recovery apparatus. FIG. 5 is an explanatory diagram viewed from the back side with the back cover of Example 2 removed. FIG. 6 is an explanatory view showing still another structural example in the second embodiment. FIG. 7 is an explanatory view showing a conventional example.

A reciprocating heat exchanger can be configured with only simple shaped parts, and in addition to the above maintainability, a heat exchanger has been realized that can be easily manufactured and assembled to improve productivity.

  FIG. 1 is an explanatory diagram of Embodiment 1 in which the present invention is applied to a Stirling engine.

  A cylinder 51 having an opening 51a serving as a working fluid passage is fixed substantially at the center of the cylinder block 50 that also serves as a radiator. The displacer 60 that changes the volume ratio of the expansion space 52 and the contraction space 53 is fixed to the cylinder 51. In addition, a power piston 61 for taking out an output by a pressure change in both spaces is provided and is configured to be driven by a crank device 70 with a predetermined phase difference from each other.

  The housing 10 is fixed to one end of the cylinder block 50. In the present embodiment, twelve heat transfer tubes 30 are installed in the housing 10, and a space connecting the expansion space 52 and the contraction space 53 is, for example, a spring. A regenerator 40 which is a heat storage heat exchanger filled with a mesh or the like is provided.

The heat transfer tube 30 is formed in a circular tube with one end closed, the multi-end is connected to the housing 10, and a folding space is secured at one end to divide the heat transfer tube 30 into an outward path 30a and a return path 30b. 20 is inserted.

As shown in the exploded view of FIG. 2, the base portion of the partition plate 20 is connected in a comb shape by a partition wall portion 21.

For the partition plate 20, an arbitrary processing method can be selected, such as cutting a cylindrical material, or forming a flat material in a comb shape in advance and performing a post-curling process.

The partition plate 20 partitions the heat transfer tube 30 into an outward path 30a and a return path 30b, and partitions the distribution space 11 in the housing 10 into an inflow space 11a and an outflow space 11b by a partition wall 21 as shown in FIG. .

Next, the operation of the heat exchanger configured as described above will be briefly described.

  The working fluid in the expansion space 52 pushed out by the displacer 60 flows through the inflow port 10a and the inflow space 11a to the outflow space 11b via the forward path 30a and the return path 30b of the heat transfer pipe 30, and at this time, the heat transfer pipe 30 Heat exchange is performed between the outside and the working fluid.

Further, the working fluid passes through the regenerator 40 and deposits its heat into the regenerator 40 and is cooled by the cylinder block 50 to reach the contracted space 53.

On the other hand, in the reverse stroke, the working fluid from the contraction space 53 receives heat from the regenerator 40 and is further heated from outside while passing through the return path 30b and the forward path 30a, and flows into the expansion space 52 at a high temperature.

As a result, a temperature difference is given between the contraction space 53 and the expansion space 52, and the heat engine provided with the expansion space and the contraction space communicating with each other and the means for changing the respective volumes with a predetermined phase difference is Stirling. It is widely known as a cycle device. For this reason, although the operation of each stroke is not described in detail, heat energy such as combustion gas given to the outside of the heat transfer tube 30 can be taken out as power of the crank device 70.

4 and 5 or 6 show an example in which the present invention is applied particularly to an exhaust pipe waste heat utilization device. FIG. 4 is a sectional view of the center thereof, and FIG. FIG.

In the present embodiment, the free ends of 15 heat transfer tubes 30 face the inside of the exhaust pipe 80, and the other ends are connected to the housing 10.

In the housing 10, a plurality of partition walls 21 divide the distribution space 11 into an inflow space 11a and an outflow space 11b, an intermediate portion is partitioned so that one outflow space corresponds to the other inflow space, and the heat transfer tube 30 Three heat transfer tube groups connected in parallel are connected in series.

Here, the partition wall portion 21 includes a flexible portion 21a. Thereby, the relative position of the adjacent partition plates 20 can allow a minute amount of change.

Exhaust gas having exhaust heat flows through the exhaust pipe 80 from the left to the right in FIG. 5, and the heat transfer pipe 30 receives heat therefrom. On the other hand, the working fluid flowing in from the inlet 10a on the right side of the figure passes through the forward path 30a and the return path 30b of each heat transfer tube 30 by the partition wall 21 and reaches the outlet 10b three times. Heat exchange takes place between them.

Here, the means for connecting the base portions of the adjacent partition plates 20 with the partition walls is not limited to an integrally molded structure. As shown in FIG. 6, the tongue-shaped partition plates 20 corresponding to the respective heat transfer tubes 30 may be connected by a connecting portion 10 c provided substantially parallel to the central axis of the heat transfer tubes.

Further, in this embodiment, a gap 21b is provided between the connecting portion 10c and the side edge of the partition wall portion 21 so that the relative position of the adjacent partition plate 20 can be moved by a minute amount, thereby reducing the required accuracy of each component. .

  It is possible to provide a heat exchanger with easy assembly and maintainability with simple parts that are easy to manufacture. Especially, a large number of heat transfer tubes can be arranged in series or in parallel according to the characteristics of the application and working fluid. Therefore, it can be applied not only to the heat exchanger of Stirling engine but also to various uses.

  Although not shown in the embodiment for simplicity, it is also possible to combine fins for increasing the heat transfer area outside the heat transfer tube. In this case, since the heat transfer tube has a free end, it is very easy to process and manufacture, and can be applied to various radiators that dissipate heat into the atmosphere.

10 housing, 10a inflow port, 10b outflow port, 10c connecting part 11 distribution space, 11a inflow space, 11b outflow space 20 partition plate,
21 partition part, 21a flexible part, 21b clearance 30 heat transfer tube 40 regenerator 50 cylinder block 51 cylinder 52 expansion space, 53 contraction space, 54 flange 60 displacer, 61 power piston 70 crank device 80 exhaust pipe 81 tube plate, 82 back lid

Claims (2)

  A housing having a distribution space connected to the inlet and outlet of the working fluid, a plurality of heat transfer tubes having one end closed and the other end connected to the housing, and a partition plate that divides the inside of the heat transfer tube into an outward path and a return path The base part of the adjacent partition plate is connected by a partition part made of a continuous surface substantially parallel to the central axis of the heat transfer tube, and the partition part passes through the distribution space through the inflow space and the outflow space. A heat exchanger configured to be partitioned into a space.   2. The heat exchanger according to claim 1, wherein the means for connecting the base portions of the adjacent partition plates is provided with a movable portion that allows a small change in the relative position between the partition plates.