KR20000014367A - Heat exchanger of stirring machine - Google Patents

Abstract

PURPOSE: A heat exchanger of a stirring machine is provided to easily manufacture and install a heat exchanger as well as to increase the heat exchanging efficiency by improving the heat transfer performance from an inner heat exchanging unit to an outer heat exchanging unit. CONSTITUTION: The a stirring machine includes:a cylinder(21) of which both ends are open installed inside of a body(20); a piston(23) installed on an inner side of the cylinder to be reciprocated by the driving of a linear motor(22); and a displacer(24) installed on the other inner side of the cylinder to be reciprocated with a specific phase difference with the piston by the movement of the piston as well as to partition the inner space of the cylinder.

Description

Heat Exchanger of Sterling Equipment

The present invention relates to a stirling device, and more particularly, to a structure of a heat exchanger that exchanges heat with a working fluid and an external heat transfer medium.

In general, a sterling device is a device that generates a refrigeration output or a heating output using the principle that the temperature rises when the working gas such as helium or hydrogen is compressed and the temperature drops when the working gas is expanded.

Here, the conventional sterling apparatus for generating a refrigeration output, as shown in Figure 1, the piston 3 for reciprocating the inside of the cylinder 2 provided in the main body 1, and the inner space of the cylinder 2 And a displacer 4 which reciprocates with a predetermined phase difference with the piston 3 by the movement of the piston 3. At this time, the displacer 4 is fixed to and supported by a support rod 6 whose one end is fixed to the resonant spring 5 and penetrates the central portion of the piston 3.

In addition, a linear motor 7 for forcibly moving the piston 3 is provided on one side of the outer surface of the cylinder 2, and the left and right spaces of the cylinder 2 partitioned by the displacer 4 are provided on the other side of the cylinder 2. The cylindrical case 9 with one end closed is provided so that the flow path 8 may be communicated with each other.

The case 9 is provided with a low temperature part heat exchanger 10 and a high temperature part heat exchanger 11 so that the working fluid passing through the flow path 8 is heat exchanged, and a regenerator 12 between the two heat exchangers 10 and 11. ) Is installed. In addition, a plurality of flow holes 13 are formed on the outer wall of the cylinder 2 so that the working fluid passing through the hot part heat exchanger 11 can flow into the space between the piston 3 and the displacer 4.

In the conventional sterling device configured as described above, when the piston 3 reciprocates by the driving of the linear motor 7, the displacer 4 reciprocates with a predetermined phase difference and is filled with the inside of the cylinder 2. Compression and expansion takes place. At this time, since the displacer 4 and the piston 3 move with a predetermined phase difference, the space between the piston 3 and the displacer 4 generally has a compression space 14. ), And the space between the displacer 4 and one end of the cylinder 2 generally constitutes the expansion space 15.

That is, the low-temperature working fluid expanded in the expansion space 15 enters the compression space 14 through the low temperature heat exchanger 10, the regenerator 12, and the high temperature heat exchanger 11, thereby performing heat exchange, and then compressing again. The high-pressure working fluid compressed in the space 14 flows in reverse to become a heat exchanger. In other words, when the working fluid is expanded, the Stirling machine absorbs heat around the low temperature part heat exchanger 10 to generate a freezing output around the low temperature part heat exchanger 10.

Meanwhile, as illustrated in FIG. 2, the heat exchangers 10 and 11 of the conventional sterling apparatus include an inner heat exchanger 10a and a case 9 provided inside the case 9 forming the flow path 8. It is composed of an outer heat exchanger (10b) provided on the outside of (). Here, since the low temperature part heat exchanger and the high temperature part heat exchanger have the same structure, the low temperature part heat exchanger will be described.

The inner heat exchange part 10a is located in the space between the inner surface of the case 9 and the outer surface of the cylinder 2, and consists of a corrugated pipe in which a thin plate is alternately bent along the inner surface of the case 2. At this time, the corrugated pipe is formed with a plurality of bones in the flow direction of the fluid to facilitate the flow of the working fluid. And the outer heat exchanger (10b) is fixed to the outer surface of the case (9), the ring-shaped cooling fins (10b) are laminated so as to maintain the spaced apart from each other. The inner heat exchanger 10a and the outer heat exchanger 10b are fixed to the inner and outer surfaces of the case 9 by soldering, brazing, pressing, or the like.

When the heat of the working fluid is transmitted to the inner heat exchanger 10a, the heat exchanger conducts heat to the case 9 and the outer heat exchanger 10b to exchange heat with external air or cooling water, which is a heat exchange medium.

However, since the heat exchangers 10 and 11 of the conventional sterling apparatus configured as described above are constituted by the inner heat exchanger 10a, the case 9, and the outer heat exchanger 10b coupled to each other, heat transfer resistances at their coupling portions. This becomes large and there is a problem that the heat exchange efficiency is lowered.

In addition, since the heat exchanger of the conventional sterling machine is made of the inner heat exchanger 10a and the outer heat exchanger 10b separately and fixed to the inner and outer surfaces of the case 9, not only does it increase the workmanship for assembling them. There was a problem that the installation and fixing of the inner heat exchanger (10a) is difficult.

The present invention is to solve such a problem, an object of the present invention is to improve the structure of the heat exchanger for heat exchange with the working fluid and the heat exchange medium, the heat transfer performance from the inner heat exchanger to the outer heat exchanger to improve the heat exchange efficiency It is to provide a heat exchanger of the Stirling machine not only high but also easy to manufacture and install the heat exchanger.

1 is a cross-sectional view showing a schematic internal structure of a conventional sterling apparatus.

Figure 2 is a perspective view showing a heat exchanger structure of a conventional sterling apparatus.

Figure 3 is a cross-sectional view showing a schematic internal structure of the sterling apparatus according to the present invention.

4a and 4b are perspective views showing the heat exchanger structure of the Stirling machine according to the present invention.

Explanation of symbols on the main parts of the drawings

20: main body, 21: cylinder,

22: linear motor, 23: piston,

24: displacer, 26: support rod,

27: resonant spring, 28: flow path,

30: player, 31: case,

32: compression space, 33: expansion space,

34: distributor, 40: low temperature heat exchanger,

40a: inner heat exchanger, 40b: outer heat exchanger,

41: heat exchange plate, 43, 44: through hole

50: high temperature heat exchanger.

The present invention for achieving the above object is a cylinder having a displacer and a piston for compressing or expanding the working fluid therein is provided a compression space in which the working fluid is compressed and an expansion space in which the working fluid is expanded; The working fluid filled in the cylinder is formed on the outside of the cylinder so as to flow freely into the compression space and the expansion space to exchange heat with the flow path for communicating the two spaces, the working fluid flowing through the flow path and the external heat exchange medium. In a Stirling device comprising a heat exchanger,

One side is located inside the flow path to exchange heat with the working fluid to form an inner heat exchanger and the other side is located outside the flow path to exchange heat with an external heat exchange medium to form an outer heat exchanger in the longitudinal direction of the cylinder It is laminated and provided, and the inner heat exchange part is characterized in that a plurality of through-holes are formed to facilitate the flow of the working fluid.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figure 3 is a cross-sectional view showing a schematic internal structure of the sterling apparatus according to the present invention, Figures 4a and 4b shows the structure of a heat exchanger according to the present invention.

As shown in the present invention, the Stirling apparatus is provided with a cylindrical cylinder 21 having both ends open inside the main body 20, and the linear motor 22 is driven on one side of the cylinder 21. The piston 23 is reciprocated by the installation. In addition, the displacer 24 which partitions the inner space of the cylinder 21 on the other side of the cylinder 21 and reciprocates with a predetermined phase difference with the piston 23 by the movement of the piston 23 is provided. Is installed.

Here, the linear motor 22 is installed in the space portion between the outer surface of the cylinder 21 on the side where the piston 23 is installed and the inner surface of the main body 20, which is fixed to the outside of the cylinder 21, the coil is wound The inner core 22a and the outer core 22b fixed to the inner surface of the main body 20 are installed to be spaced apart from each other, and the magnet 22c is reciprocated by interacting with these spaced spaces. Is installed. At this time, the magnet 22c is supported by the cylindrical support 25, and one end of the support 25 is fixed to the fixing portion 23a extending from the end of the piston. Accordingly, when the linear motor 22 is driven, the piston 23 reciprocates.

In addition, the displacer 24 is fixed to a long supporting rod 26, which is extended long through a hollow formed in the center of the piston 23, the extended end is the main body 20 It is fixed to the resonant spring 27 fixed inside the. That is, the displacer 24 is supported by the support rod 26 and the resonant spring 27.

In addition, on the other outer surface of the cylinder 21, a fluid flow path 28 through which the left and right spaces of the cylinder 21 partitioned by the displacer 24 communicate is formed, and a working fluid passing through the flow path 28 is formed. The low temperature heat exchanger 40 and the high temperature heat exchanger 50 are installed to be spaced apart from each other such that hydrogen (helium, etc.) is heat exchanged, and a regenerator that serves as a heat storage material for storing heat between the two heat exchangers 40 and 50. 30 is installed. A case 31 is installed on the outer surface of the regenerator 30 and the head of the cylinder 21 so as to form a sealed structure in a state where the flow path 28 and the internal spaces 32 and 33 of both sides of the cylinder 21 communicate with each other. do. In addition, a plurality of flow holes 34 are formed at the center of the outer wall of the cylinder 21 so that the working fluid passing through the high temperature part heat exchanger 50 may flow into the space between the piston 23 and the displacer 24. In addition, the outer side of the hot portion heat exchanger 50 is provided with a jacket 35 filled with a cooling water to cool the outer heat exchanger portion of the high temperature portion heat exchanger (50).

On the other hand, the low temperature part heat exchanger 40 and the high temperature part heat exchanger 50 is provided in the same structure, the heat exchanger (40, 50) according to the present invention is an external air and cooling water from the inner heat exchanger to exchange heat with the working fluid The heat transfer performance to the outer heat exchanger to be heat exchanged is improved, and the assembling and manufacturing of the heat exchangers 40 and 50 are facilitated. This structure will be described with reference to FIG. 4A. (Here, since the low temperature part heat exchanger and the high temperature part heat exchanger have the same structure, they will be described based on the low temperature part heat exchanger.)

In the heat exchanger (40, 50) according to the present invention, a ring-shaped heat exchanger plate (41) having a hollow portion having the same size as the outer diameter of the cylinder (21) is formed in the longitudinal direction of the cylinder (21). In addition, a plurality of through holes 43 are radially formed in the inner heat exchange part 40a adjacent to the inner diameter part of each heat exchange plate 41 so that a flow path through which the working fluid passes is formed. In addition, the heat exchange plate 41 includes a heat exchange plate 41b having a small outer diameter and a heat exchange plate 41a having a large outer diameter so that the heat transfer area of the outer heat exchanger 40b adjacent to the outer diameter portion is increased to increase the heat exchange efficiency. And they are alternately stacked. That is, by inserting the heat exchange fin 41b having a small outer diameter between the heat exchanger plate 41a having a large outer diameter, a space is formed between the two heat exchange plates 41a having a large outer diameter and the heat transfer area becomes large.

As such, since the inner heat exchanger 40a and the outer heat exchanger 40b are configured as an integral heat exchanger plate 41, the heat transfer resistance is minimized to increase the heat exchanger efficiency of the heat exchanger 40.

When the heat exchanger 40 is manufactured, a plurality of heat exchanger plates 41 are manufactured through a process such as a press, and then the through holes 43 of the heat exchanger plates 41 are matched to each other through soldering or brazing. It is good to adhere | attach mutually.

4B illustrates another embodiment of the present invention, in which a plurality of through holes 44 are formed in the outer heat exchange part 40b adjacent to the outer diameter part. This is to further increase the heat exchange efficiency by allowing the heat transfer medium such as water or air to flow freely.

The following describes the operation of the sterling apparatus according to the present invention configured as described above.

In the sterling device according to the present invention, when the piston 23 is reciprocated by the driving of the linear motor 22, the hydrogen is filled in the cylinder 21 while the displacer 24 is reciprocated with a predetermined phase difference. , Working fluids such as helium are compressed or expanded. That is, since the displacer 24 and the piston 23 move with a predetermined phase difference, the space between the piston 23 and the displacer 24 generally has a compression space 32. ), And the space between the displacer 24 and one end of the cylinder 21 generally constitutes the expansion space 33.

In more detail, the low-temperature working fluid expanded in the expansion space 33 is introduced into the compression space 32 through the low temperature heat exchanger 40, the regenerator 30, and the high temperature heat exchanger 50, thereby performing heat exchange. In addition, the high-temperature working fluid compressed in the compression space 32 flows in reverse to exchange heat.

That is, the Stirling machine absorbs heat around the low temperature part heat exchanger 40 when the working fluid is expanded, and the air around the low temperature part heat exchanger 40 whose temperature has fallen off exchanges heat with the external heat exchange part of the low temperature part heat exchanger 40. Will create cold air.

On the other hand, when the working fluid absorbed energy in the expansion process in the expansion space 33 is introduced into the compression space 32 through the low temperature heat exchanger 40, the regenerator 30, the high temperature heat exchanger 50, the regenerator The working fluid passing through the 30 is supplied to the compression space 32 in a state where the temperature is raised by receiving the heat accumulated in the regenerator 30. When the compression space 32 is compressed, the working fluid is raised to a high temperature, and the high temperature working fluid passes through the high temperature part heat exchanger 50, the regenerator 30, and the low temperature part heat exchanger 40. It is introduced into and expanded.

At this time, the working fluid coming out of the compression space 32 undergoes heat exchange while passing through the high temperature part heat exchanger 50 to release heat, and heat accumulate the regenerator 30 while passing through the regenerator 30. That is, the working fluid is cooled in the high-temperature part heat exchanger 50 and then flows into the expansion space 33 in a more cooled state while passing through the regenerator 30 to expand.

When expansion occurs in the expansion space 33, the temperature of the working fluid is lowered again to cause an endothermic reaction. That is, as the cycle is repeated, the sterling device generates a freezing output.

On the other hand, during this cycle, the heat exchanger (40, 50) is between the inner heat exchanger 40a for heat exchange with the working fluid and the outer heat exchanger (40b) for heat exchange with a heat transfer medium such as water or air. Heat transfer is achieved. At this time, the heat exchanger according to the present invention is composed of an integral heat exchange plate (40a) and the outer heat exchanger (40b), integrally formed heat exchange plate 41, because they are laminated, heat transfer performance is improved and the heat exchange efficiency is greatly increased.

That is, the conventional heat exchanger 10 has a problem that the heat transfer resistance is increased in these coupling portions because the inner heat exchanger (10a) and the outer heat exchanger (10b) is attached to the case (9), According to the present invention, the heat transfer performance is greatly improved as the outer heat exchanger 40b exposed to the outside and the inner heat exchanger 40a positioned on the flow path through which the working fluid flows are configured as an integral heat exchanger plate 41.

As described above in detail, the heat exchanger of the Stirling machine according to the present invention is configured by stacking a plurality of ring-shaped heat exchanger plate, the flow path through which the working fluid passes is formed in the inner heat exchanger portion adjacent to the inner diameter portion of each metal plate. The heat exchanger plate is alternately stacked with a heat exchanger plate having a large outer diameter and a heat exchanger plate having a small outer diameter so that a space is formed in the outer heat exchanger portion so that the heat transfer area is widened. Therefore, the inner heat exchanger that exchanges heat with the working fluid and the outer heat exchanger that exchanges heat with the external heat exchange medium (water, air, etc.) are integrally formed, thereby minimizing heat transfer resistance, thereby greatly improving the heat exchange efficiency of the heat exchanger. There is an advantage of easy manufacturing and installation of the heat exchanger.

Claims (3)

A cylinder 21 having a displacer 24 and a piston 23 for compressing or expanding a working fluid therein and having a compression space 32 in which the working fluid is compressed and an expansion space 33 in which the working fluid is expanded. And a flow path 28 formed outside the cylinder 21 so that the working fluid filled in the cylinder can flow freely into the compression space 32 and the expansion space 33 and communicate with the two spaces. In the Stirling device comprising a heat exchanger for heat exchange with the working fluid flowing in the flow path, One side is positioned inside the flow path 28 to exchange heat with the working fluid to form an inner heat exchange part 40a, and the other side is positioned outside the flow path 28 to exchange heat with an external heat exchange medium. A plurality of heat exchange plates 41 constituting the 40b are stacked in the longitudinal direction of the cylinder 21, and the plurality of through holes 43 are provided in the inner heat exchange part 40a to smoothly flow the working fluid. Heat exchanger of the sterling apparatus, characterized in that formed. The method of claim 1, Sterling is characterized in that the heat exchange plate 41 is provided with a heat exchange plate 41a having a large outer diameter and a heat exchange plate 41b having a small outer diameter so that the heat transfer area of the outer heat exchanger portion 40b is widened. Heat exchanger of the appliance. The method of claim 2, The outer heat exchanger (40b) of the heat exchange plate (41) heat exchanger of the Stirling machine, characterized in that a plurality of through-holes (44) are formed to facilitate the circulation of the heat exchange medium.