ES2256581T3 - REGENERATOR AND REGENERATIVE HEAT SYSTEM FOR FLUIDIZED GAS USED BY THE REGENERATOR. - Google Patents

Abstract

Regenerator (1) composed of a resin film (2) in the form of a strip rolled in a cylindrical shape, in which the resin film (2) has a multilayer structure (2, 3, 4), at least in a part thereof, which occupies a predetermined width from an edge thereof.

Description

Regenerator and heat regenerative system for fluidized gas used by the regenerator.

Technical field

The present invention relates to a regenerator for use in a Stirling cycle refrigerator or similar and it also refers to a gas heat regeneration system of flow that employs such a regenerator.

Prior art

As shown in Figure 8, a type of Conventional regenerator 1 for use in a cycle refrigerator of Stirling is composed of, for example, a movie 2 of resin, which has 2nd fine projections formed on the surface of the same, rolled in a cylindrical shape with a hollow space left inside her.

Figure 9 is a cross-sectional view of An example of a piston-type Stirling cycle refrigerator free that incorporates regenerator 1. First, it will be described How this Stirling cycle refrigerator works. Such as shown in figure 9, the Stirling cycle refrigerator Free piston type includes a cylinder 8 that has inside a working gas such as helium sealed inside it, a displacer 7 and a piston 5 arranged to divide the space inside of cylinder 8 in an expansion space 10 and a space 9 of compression, a linear motor 6 to drive the piston 5 so that it alternately move, a heat absorber 14 provided in the side of the expansion space 10 to absorb heat from the outside  and a heat expeller 13 disposed on the side of space 9 of compression to expel heat to the outside.

In Figure 9, reference numbers 11 and 12 they represent flat springs that support displacer 7 and the piston 5, respectively, and allow them to move alternately by elasticity. Reference number 15 represents a heat exchanger heat exchanger, and reference number 16 represents a heat exchanger heat exchanger. These heat exchangers cause heat exchange between the inside and outside of the refrigerator. Between exchanger 15 Heat expeller heat and heat exchanger 16 Heat absorber is arranged a regenerator 1.

In this structure, when the linear motor 6 is actuates, the piston 5 rises inside the cylinder 8 compressing the gas working in compression space 9. As the gas from work is compressed, its temperature rises, but, simultaneously, the Work gas is cooled by exchanging heat with the outside air through the heat expeller 13 through the heat exchanger 15 heat expeller. Therefore, it is achieved  an isothermal compression. The compressed work gas in the Compression space 9 by the piston 5 flows, under pressure, to the inside the regenerator 1 and then inside the space 10 of expansion. Meanwhile, the heat of the working gas is stored in the resin film 2 constituting the regenerator 1, and by Therefore, the working gas temperature drops.

The working gas that has flowed into the expansion space 10 is under high pressure and it expands when displacer 7, which moves alternately with a predetermined phase difference maintained in relation to the piston 5, lower. Meanwhile, the working gas temperature low, but the working gas is heated by absorbing heat from outside by heat absorber 14 through heat exchanger 16 heat absorber. Therefore, it Get an isothermal expansion. From then on, the displacer 7 begins to rise, and therefore, the working gas in the expansion space 10 flows through the regenerator 1 back inside the compression space 9. Meanwhile, the gas of work receives the heat stored in regenerator 1, and therefore, the working gas temperature rises. This sequence of operations, called the Stirling cycle, is repeated by the alternative movement of the driven components, with the result that the heat absorber 14 absorbs heat from the air outside and gradually cools.

In this way, the heat energy of the gas from work is regenerated by regenerator 1 between space 9 of compression and expansion space 10. Here, increase the amount of heat stored in regenerator 1 results in a greater efficiency of heat energy regeneration. This makes it possible to achieve an ideal Stirling cycle and thus improve the refrigeration performance of the cycle refrigerator Stirling.

However, in the structure of the regenerator 1 conventional described above, regenerator 1 itself said is made up of a resin film 2, which generally has Low thermal conductivity This results in low driving of heat from the working gas to the resin film 2. Therefore the regenerator 1 cannot store a sufficient amount of heat, which results in a regeneration efficiency of unsatisfactory heat energy. This reduces the performance of Stirling cycle refrigerator cooling. In addition, the regenerator edges are prone to deformation, causing variations in regeneration performance and resulting in a unstable regeneration performance. Therefore, an object of the present invention is to provide a regenerator that offers excellent heat energy regeneration efficiency and a stable regeneration performance.

Document DE 3240598 describes a device rotating heat recovery that has a matrix made of plastic. The dimensions of the matrix are adapted to some specific dimensional parameters, and the matrix strip is equipped with transverse protuberances that have a length that is less than the width of the strip, in order to allow that a winding tension acts on the strip without influencing the dimensions of the bumps. The dimensional parameters allowed by the use of plastic allow the production of discs of matrix that have a minimum thickness that reduces losses circumferential for leaks.

Description of the invention

According to one aspect of the present invention, provides a regenerator composed of a resin film with strip form rolled in a cylindrical shape, the film of resin has a multilayer structure, at least in one part of it, which occupies a predetermined width from a edge of it. This helps increase the resistance of regenerator edges to make them less likely to deform and therefore helps stabilize the regenerator performance.

When hot work gas flows to inside the regenerator at one end thereof, the heat of the gas Working is stored in the resin film. Here, the layer that It has a high thermal conductivity formed in the film Resin improves heat conduction in the regenerator. So, more heat is stored in the resin film. When the gas from cold work flows into the regenerator at the other end thereof, the working gas receives the heat stored in the resin film Here, the layer that has a high conductivity thermal formed in the resin film improves the conduction of heat in regenerator 1 and provides greater capacity calorific Therefore, more heat is expelled to the working gas. From In this way, it is possible to achieve a high regeneration efficiency of heat energy.

The resin film may have a plurality of fine protrusions formed on the surface thereof. This leaves spaces between the different turns of the resin film placed on top of each other and therefore allows the gas from work circulate through these spaces from the end to high temperature to the extreme at low temperature and vice versa at Cylinder shaft length.

Preferably, in the regenerator composed of a strip-shaped resin film rolled in a shape cylindrical, the resin film is composed of two films of strip-shaped resin that have a layer with a higher thermal conductivity than the two laminated resin films between the two resin films. This avoids leaving exposed to outer layer that has a high thermal conductivity.

In particular, form the layer that has a high thermal conductivity on the resin film to occupy a default width from a regenerator edge helps reduce the surface, and therefore the material and other costs, of the layer that has a high thermal conductivity compared with a case in which the layer that has a high conductivity Thermal is formed throughout the resin film. The layer you have high thermal conductivity can be easily formed printing on the resin film as resin ink that It contains an ingredient that has a high thermal conductivity. In that case, as an ingredient that has a high thermal conductivity fine particles of at least one of gold, silver are suitable, Copper, aluminum and carbon.

By having the regenerator present invention in a donut-shaped space that serves as a step of flow for an alternative gas, it is possible to produce a versatile flow gas heat regeneration system that It offers great efficiency of heat energy regeneration. In in particular, when applying the present invention to a refrigerator of Stirling cycle of free piston type, it is possible to get a Excellent cooling performance.

In order that the present invention be understood more easily, specific embodiments of the same with reference to the attached drawings.

Brief description of the drawings

Figure 1 is a perspective view that shows the structure of the regenerator of a first embodiment of the invention.

Figure 2 is an enlarged sectional view of the regenerator.

Figure 3 is a perspective view that shows the structure of the regenerator of a second embodiment of the invention.

Figure 4 is a perspective view that shows the structure of the regenerator of a third embodiment of the invention.

Figure 5 is a perspective view that shows the structure of the regenerator of a fourth embodiment of the invention.

Figure 6 is a perspective view that shows the structure of the regenerator of a fifth embodiment of the invention.

Figure 7 is an enlarged sectional view that shows the regenerator of a sixth embodiment of the invention.

Figure 8 is a perspective view that shows the structure of an example of a regenerator conventional.

Figure 9 is a side sectional view that shows an example of a type Stirling cycle refrigerator free piston

Best way to carry out the invention

With reference to the drawings, a First embodiment of the invention. Figure 1 is a view in perspective showing the regenerator structure of the first embodiment of the invention, and Figure 2 is a sectional view Extended regenerator. As shown in Figure 1, the regenerator 1 consists of a resin film 2 shaped rolled strip in a cylindrical shape. The resin film 2 is made of a material that has a specific high heat, a low thermal conductivity, high heat resistance, low moisture absorption and other desirable properties, including appropriate examples polyethylene terephthalate (PET) and the polyimide

The resin film 2 has a plurality of 2nd protrusions formed regularly on a whole surface Of the same. These projections 2a can be formed, for example, by printing, engraving or thermoforming. As shown in the Figure 2, the projections 2a allow spaces to remain between the different turns of the resin film 2 placed on others. Therefore, as shown in Figure 1, the gas from work flows through these spaces from the 1H end to high temperature to end 1C at low temperature, as indicated by an arrow A, and vice versa along the axis of the cylinder (indicated the direction by a line B of stripes and points).

On both surfaces of film 2 of resin, like thin films, forms 3 layers of resin that contain an ingredient that has a higher conductivity thermal than resin film 2. As an ingredient that has a high thermal conductivity are fine fine particles of at least one of gold, silver, copper, aluminum, carbon or similar used separately or as a mixture of two or more of them. The fine particles are mixed with a resin material such as the polyethylene, and the mixture is then printed, as ink, on both resin film 2 surfaces to cover it with layers 3 of resin.

Next, it will be described how the heat regeneration in a Stirling cycle refrigerator that employs this regenerator 1. When a compressed work gas, and therefore heated, it flows into the regenerator 1 through the 1H high temperature end thereof, the heat energy of the Work gas is stored in resin film 2. Here put that the resin layers 3 on the resin film 2 have a thermal conductivity high enough, heat energy circulates first along the resin layers 3 and then it Stores throughout the resin film 2. Therefore, a sufficient amount of heat. Moreover, when the gas from expanded work, and therefore cooled, flows into regenerator 1 at the low temperature end 1C thereof, the Stored heat is ejected. Here, heat energy circulates to along the resin layers 3 and ejected from the entire film 2 from resin to working gas. Therefore, an amount is ejected Enough of heat. In this way, the regenerator 1 works with a Improved energy regeneration efficiency.

With reference to the drawings, a second embodiment of the invention. Figure 3 is a view in perspective showing the structure of the regenerator of the second embodiment of the invention. As shown in Figure 3, the Resin film 2 has a plurality of fine 2nd protrusions formed regularly on a whole surface of it. These 2nd protrusions allow spaces between the different turns of the resin film 2 placed on top of each other. By therefore, the working gas flows through these spaces from the end 1H at high temperature to end 1C at low temperature, such as indicated by an arrow A, and vice versa along the cylinder axis (indicated by a line B of stripes and points).

As shown in figure 3, on both Resin film 2 surfaces are formed, in the form of strips arranged at regular intervals along the axis of the cylinder, 3 layers of resin that contain an ingredient that It has a higher thermal conductivity than resin film 2. In the parts on the surfaces of the resin film 2 in those that are not formed layers 3 of resin, are placed beforehand some masks in the form of strips arranged at intervals regular. Then, the coating is carried out exactly Same as the first embodiment. Finally, the masks are removed and remove to obtain 3 layers of resin. The strips of the layers 3 of resin can be arranged at irregular intervals.

Next, it will be described how a heat regeneration in a Stirling cycle refrigerator that employs this regenerator 1. When a compressed work gas, and therefore heated, it flows into the regenerator 1 through the 1H high temperature end thereof, the heat energy of the Work gas is stored in resin film 2. Here put that the resin layers 3 on the resin film 2 have a thermal conductivity high enough, heat energy first circulate to the individual strips of layers 3 of resin and then stored from individual strips to film 2  of resin. Therefore, a sufficient amount of heat is stored. On the other hand, when the work gas expanded, and therefore cooled, flows into regenerator 1 through end 1C to low temperature of the same, the stored heat is expelled. Here, the heat energy circulates from the resin film 2 at individual strips of resin layers 3 and then ejected to working gas Therefore, a sufficient amount of hot. In this way, the regenerator 1 works with an efficiency of Enhanced energy regeneration.

In this embodiment, the resin layers 3 on the resin film 2 is formed in the form of strips arranged to intervals. This helps reduce heat loss during heat conduction through the layers 3 of resin from the 1H end at high temperature to 1C end at low temperature. In addition, the resin layers 3 have a surface smaller than when they are formed in the entire resin film 2. This helps reduce the amount of high ingredient thermal conductivity used and therefore helps reduce costs. Although the parts where resin layers 3 are not formed they have a relatively low thermal conductivity, since the 3 layers of resin are formed in the form of strips, by means of determination of the widths and the intervals of the strips of the 3 layers of resin for the working gas to make such a contact small as possible with those parts of low conductivity thermal, it is possible to minimize the reduction of the efficiency of heat energy regeneration.

With reference to the drawings, a third embodiment of the invention. Figure 4 is a view in perspective showing the structure of the third regenerator embodiment of the invention. As shown in Figure 4, the Resin film 2 has a plurality of fine 2nd protrusions formed regularly on a whole surface of it. These 2nd protrusions allow spaces between the different turns of the resin film 2 placed on top of each other. By therefore, the working gas flows through these spaces from the end 1H at high temperature to end 1C at low temperature, such as indicated by an arrow A, and vice versa along the cylinder axis (indicated by a line B of stripes and points). Here, the parts of regenerator 1 around end 1H at high temperature and end 1C at low temperature contribute to the regeneration of heat energy to a degree particularly high.

As shown in Figure 4, on both surfaces of the resin film 2 are formed, by the same process that in the second embodiment, layers 3 of resin that contain an ingredient that has a higher thermal conductivity that the resin film 2 to occupy a width default from each edge of the regenerator 1.

In this embodiment, the resin layers 3 on the resin film 2 is formed to occupy a width predetermined from each edge of regenerator 1 and therefore have a smaller surface than when they form throughout the movie. Therefore, this helps reduce the amount of High thermal conductivity ingredient used and therefore It helps reduce costs. Also, since these parts of the regenerator 1 contribute to the regeneration of heat energy to a high degree, there is hardly any reduction in performance in the results of the regenerator 1.

With reference to the drawings, a fourth embodiment of the invention. Figure 5 is a view in perspective showing the structure of the regenerator of the fourth embodiment of the invention.

As shown in figure 5, on both Resin film 2 surfaces are formed, in the form of strips arranged at regular intervals along the axis of the cylinder, 3 layers of resin that contain an ingredient that has a higher thermal conductivity than resin film 2 so that occupy a predetermined width from each edge of the regenerator one.

In this embodiment, the resin layers 3 on the resin film 2 is formed at intervals to occupy a default width from each edge of regenerator 1 and by both have a smaller surface than when they form in the whole movie. Therefore, this helps reduce the amount of the high thermal conductivity ingredient used and therefore it helps reduce costs. Also, since these parts of regenerator 1 contribute to energy regeneration calorific to a high degree, there is hardly any reduction in performance on regenerator results 1.

In the embodiments described so far, the resin film 2 is described as having resin layers 3 formed on both surfaces of it. However, also it is possible to form a resin layer only on a surface of The resin film. In that case, less ink is required and only It is necessary to perform the coating once. This greatly reduces the costs.

With reference to the drawings, a fifth embodiment of the invention. Figure 6 is a view in perspective showing the structure of the fifth regenerator embodiment of the invention.

As shown in Figure 6, on both surfaces of the resin film 2 coatings are formed  4 of polyethylene resin or the like to occupy a width default from each edge of the regenerator 1. In the parts central on the surfaces of the resin film 2 in the that it is not necessary to form the resin coatings 4, put some masks in advance. Then a material of resin is printed as ink on both surfaces of the film 2 resin to obtain a coating. Finally, the masks are removed and removed to obtain the coatings 4 of resin.

In this embodiment, when the resin coatings 4, resin film parts 2 that occupy a predetermined width from each edge of it, that is, the parts that contribute to energy regeneration calorific to a high degree, they get thicker. This not only helps increase heat storage capacity and to thus improve the efficiency of heat energy regeneration, it also helps make resin film 2 less prone to wrinkles when rolled.

In this embodiment, the resin film 2 is describes how having the resin coatings 4 formed on both surfaces of it. It is also possible to form a resin coating only on a film surface of resin. In that case, less ink is required and only necessary Perform the coating once. This greatly reduces the costs

With reference to the drawings, a sixth embodiment of the invention. Figure 7 is a view in enlarged cut showing the regenerator of the sixth embodiment of the invention. As shown in Figure 7, the regenerator 1 it consists of a composite resin film 20 rolled in a cylindrical. The composite resin film 20 is composed of two films 21 and 22 of strip-shaped resin having a resin layer 3, described later, laminated between them. A Resin film 21 has a plurality of 2nd fine projections formed regularly on a whole surface of it. Such as shown in figure 7, these projections 2a allow there are spaces between the different turns of movie 20 of Composite resin placed on top of each other. Therefore, as is shown in figure 1, the working gas flows through these spaces from end 1H at high temperature to end 1C at low temperature, as indicated by an arrow A, and vice versa at along the axis of the cylinder.

On a surface of the resin film 22 it forms, like a thin film, a layer 3 of resin that has higher thermal conductivity than resin film 22. The two resin films 21 and 22 are placed together so that the surface of the resin film 22 on which the layer is formed 3 resin keep in immediate contact with the surface of the resin film 21 in which the protrusions are not formed 2nd. In this way, the composite resin film 20 is produced which It has layer 3 of resin laminated inside it.

In this embodiment, the resin layer 3 is not left exposed to the outside and therefore never falls. This greatly improves the durability. In this case, the laminated resin layer 3 can form in strips arranged at predetermined intervals at length of the cylinder shaft, as shown in figure 3, or can be formed to occupy a predetermined width from each edge of regenerator 1, as shown in figure 4, or it can be formed in strips arranged at predetermined intervals at cylinder axis length to occupy a predetermined width from each edge of the regenerator 1, as shown in the figure 5.

In all the described embodiments above, layer 3 or resin layers are described as being Printed as ink. However, they can be formed by any other method, such as painting, vapor deposition, electrodeposition or application of a film tape thin.

By arranging a structured regenerator 1 such as described above in a space shaped donut to constitute a system in which a gas is made flow through said space alternately, it is possible produce a versatile gas heat regeneration system of flow as exemplified by a Stirling cycle refrigerator of type of free piston.

Industrial applicability

As described above, according to the present invention, in a regenerator composed of a film of strip-shaped resin rolled in a cylindrical shape, on the surface of the resin film, a layer is formed that has a higher thermal conductivity than the resin film or, alternatively, a resin coating is formed so that occupy a predetermined width from a regenerator edge. This increases the heat conduction in the regenerator and stabilizes the performance of it. In a heat regeneration system of flow gas that has this regenerator arranged in a space with donut shape, when a hot working gas flows to the inside the regenerator at one end thereof, the heat of the gas Working is stored in the resin film. Here, the layer that It has high thermal conductivity or resin coating formed on the resin film improve heat conduction in the regenerator. Therefore, the resin film is stored more heat. When cold working gas flows into the regenerator at the other end of it, the heat stored in the Resin film is ejected to the working gas. Here, the layer that It has high thermal conductivity or resin coating formed on the resin film improve heat conduction in the regenerator and increase its heat capacity. By therefore, more heat is expelled to the working gas. In this way, it is possible to achieve high energy regeneration efficiency calorific

In particular, when the regenerator of the The present invention is applied to a Stirling cycle refrigerator Free piston type, it is possible to get excellent cooling performance

Claims (6)

1. Regenerator (1) composed of a film (2) of strip-shaped resin rolled in a cylindrical shape, in which the resin film (2) has a structure (2, 3, 4) of multiple layers, at least in a part of it, which occupies a default width from one edge of it. 2. Regenerator (1) according to claim 1, in which the resin film has a plurality of projections (2a) fines formed on a surface thereof. 3. Regenerator (1) according to claim 1, in which one layer (3, 4) used to form the structure of multiple layers have a higher thermal conductivity than the resin film (2). 4. Regenerator (1) according to claim 3, in the one that the layer (3, 4) that has a higher thermal conductivity is a layer (2) of resin that contains an ingredient that has a high thermal conductivity, and the ingredient that has a high thermal conductivity is fine particles of at least one of Gold, silver, copper, aluminum and carbon. 5. Regenerator according to claim 1 and composed of a resin film (20) in the form of a rolled strip  in a cylindrical shape, the resin film (20) being composed of two films (21, 22) of strip-shaped resin having a layer (3) with a higher thermal conductivity than the two laminated resin films (21, 22) between the two films of resin. 6. Gas heat regeneration system flow comprising a regenerator (1) according to one of the claims 1 to 5 arranged in a flow path of a gas alternative.