JP2005042949A - Heat exchange system and stirling refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchange system having excellent refrigerating efficiency, and to provide a stirling refrigerator having a high coefficient of performance. <P>SOLUTION: A natural circulation type circuit includes an evaporator 3 provided in the periphery of a heat radiating part of the stirling refrigerator to absorb the heat from the heat radiating part with evaporation of refrigerant, a condenser arranged at a position higher than the evaporator 3, a conduit 8 for leading the refrigerant from the evaporator 3 to the condenser, and a return pipe 9 for returning the liquid refrigerant from the condenser to the evaporator 3. Inside the evaporator 3 of this circuit, a distance between an opening part 9A of the return pipe 9 and the inner peripheral surface 11A of the evaporator 3 is formed smaller than a distance between an opening part 8A of the conduit 8 and the inner peripheral surface 11A. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchange system and a Stirling cooler, and more particularly, to a heat exchange system by circulation of a refrigerant, which includes an evaporator and a condenser, and a Stirling cooler including the heat exchange system.
[0002]
[Prior art]
As a heat exchange system of a heat radiating part (high temperature part) such as a conventional Stirling refrigerator, for example, one described in Japanese Patent Application Laid-Open No. 2003-50073 (conventional example 1) can be cited.
[0003]
Conventional example 1 includes a high temperature side evaporator and a high temperature side condenser connected by piping, and the high temperature side condenser is provided at a position higher than the high temperature side evaporator, and a natural refrigerant such as water or hydrocarbon is enclosed. In addition, a high temperature side heat exchange cycle in a Stirling refrigerator that conveys and releases heat according to the thermosyphon principle is disclosed.
[0004]
Here, when the operation of the Stirling refrigerator is started, the temperature of the high temperature portion rises, the heat transfer medium is heated and evaporated by the high temperature side evaporator, and flows into the high temperature side condenser through the piping. At the same time, by the rotation of the heat dissipating fan, the air outside the chamber is sucked into the air duct from the suction port, and after passing between the fins of the high-temperature side condenser, is blown out from the outlet. At that time, the heat transfer medium is cooled and condensed by the high-temperature side condenser. The condensed heat transfer medium flows down through the piping and returns to the high temperature side evaporator again. Thus, the natural circulation of the heat transfer medium is performed, and the heat of the high temperature part of the Stirling refrigerator is dissipated outside the chamber.
[0005]
[Patent Document 1]
JP 2003-50073 A
[0006]
[Problems to be solved by the invention]
However, the above heat exchange system has the following problems.
[0007]
The high temperature side evaporator is connected to a first pipe for guiding the gasified refrigerant from the evaporator to the condenser and a second pipe for returning the condensed refrigerant from the condenser to the evaporator.
[0008]
Here, the speed when the refrigerant gasified in the evaporator flows into the first pipe is very high, and the flow rate when the condensed refrigerant flows into the evaporator is relatively small. The inflowing refrigerant may flow into the first pipe in the liquid state together with the gas having a large flow rate.
[0009]
Due to the above inflow, the liquid refrigerant in the evaporator is reduced and the liquid level is lowered. Here, since the cooling function of the evaporator is mainly exerted by the evaporation of the liquid refrigerant, as a result, the cooling function of the heat exchange system is deteriorated.
[0010]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a heat exchange system with good cooling efficiency and a Stirling refrigerator equipped with the heat exchange system.
[0011]
[Means for Solving the Problems]
In one aspect, the heat exchange system according to the present invention is provided around the heat dissipating unit, evaporates an internal refrigerant, a condenser that condenses the refrigerant, and guides the refrigerant from the evaporator to the condenser. A heat exchange system comprising a conduit and a return pipe for returning the refrigerant condensed in the condenser from the condenser to the evaporator, wherein in the evaporator, an opening of the return pipe and an inner peripheral surface of the evaporator Is less than the distance between the opening of the conduit and the inner peripheral surface.
[0012]
In another aspect, the heat exchange system according to the present invention is provided around the heat dissipating unit, evaporates an internal refrigerant, divided into a plurality of evaporators, a condenser that condenses the refrigerant, and a plurality of refrigerants. A heat exchange system comprising a conduit that leads from each divided evaporator to a condenser and a return pipe that returns refrigerant condensed in the condenser from the condenser to each evaporator, the return pipe being a conduit Are connected to the circumferential end face side closer to the conduit of each evaporator.
[0013]
This makes it difficult for the condensed refrigerant flowing into the evaporator from the return pipe to be entrained in the gas flow flowing from the evaporator to the conduit. As a result, it is possible to prevent the cooling function of the heat exchange system from being deteriorated.
[0014]
In yet another aspect, the heat exchange system according to the present invention is divided into a plurality of evaporators, a condenser that condenses the refrigerant, and a conduit that leads the refrigerant from each of the divided evaporators to the condenser. A return pipe for returning the refrigerant condensed in the condenser from the condenser to each evaporator, and a connecting pipe for connecting the plurality of evaporators and allowing the liquid refrigerant to flow between the plurality of evaporators. .
[0015]
Thereby, since the liquid level imbalance of the liquid refrigerant in the plurality of evaporators can be adjusted, an extreme decrease in the liquid level of each evaporator is buffered, resulting in a decrease in the cooling effect of the evaporator. Can be prevented.
[0016]
Here, in one aspect, it is preferable that the conduit and the return pipe are connected to the outer peripheral surface of the evaporator, and the return pipe protrudes closer to the inner peripheral surface of the evaporator than the conduit.
[0017]
At this time, it is preferable that the return pipe bends inside the evaporator and extends in a direction intersecting with the axial end face of the evaporator inside the evaporator.
[0018]
In another aspect, the conduit is preferably connected to the outer peripheral surface of the evaporator, and the return pipe is connected to the axial end surface of the evaporator.
[0019]
At this time, it is preferable that the return pipe extends inside the evaporator in a direction intersecting with the axial end face of the evaporator.
[0020]
Thereby, in any aspect, the condensed refrigerant can be caused to flow into an arbitrary place in the evaporator. Therefore, the effect of preventing the refrigerant from flowing back into the conduit can be enhanced.
[0021]
In addition, as described above, a plurality of variations can be selected for the conduit and the return pipe corresponding to the structural constraints. As a result, the cooling effect of the evaporator can be enhanced without being restricted by the structural restrictions of the device to which the heat exchange system is applied.
[0022]
Moreover, it is preferable that a return pipe is connected to the said axial direction end surface on the opposite side with respect to the heat absorption part of a refrigerator.
[0023]
Thereby, it can prevent that the temperature of this low temperature part rises by the heat conduction from the refrigerant | coolant which is comparatively high temperature.
[0024]
The return pipe preferably has a plurality of openings inside the evaporator.
Thereby, the condensed refrigerant can be dispersed in the axial direction and allowed to flow into the evaporator. Therefore, the cooling effect of the evaporator can be enhanced.
[0025]
Further, it is preferable that the diameter of the opening of the return pipe is increased from the upstream side to the downstream side of the return pipe.
[0026]
Thereby, a refrigerant | coolant can be more uniformly disperse | distributed and it can flow in in an evaporator.
[0027]
In yet another aspect, the heat exchange system according to the present invention is provided around the heat dissipating unit, evaporates an internal refrigerant, a condenser that condenses the refrigerant, and the refrigerant from the evaporator to the condenser. A conduit for guiding, a return pipe for returning the refrigerant condensed in the condenser from the condenser to the evaporator, and a refrigerant inflow preventing portion for preventing liquid refrigerant from flowing into the conduit in the evaporator.
[0028]
Thereby, it can suppress that the refrigerant | coolant in an evaporator flows in into a conduit | pipe from an evaporator with a liquid state.
[0029]
In yet another aspect, the heat exchange system according to the present invention is provided around the heat dissipating unit, evaporates an internal refrigerant, a condenser that condenses the refrigerant, and the refrigerant from the evaporator to the condenser. A heat exchange system comprising first and second conduits leading to and a return pipe for returning refrigerant condensed in the condenser from the condenser to the evaporator, the first and second conduits being connected to the evaporator The evaporator and the return pipe are connected between the connection positions.
[0030]
This makes it difficult for the condensed refrigerant flowing from the return pipe to the evaporator to be caught in the gas flow flowing from the evaporator to the conduit.
[0031]
In any aspect, the liquid level in the evaporator is prevented from lowering due to the backflow of the liquid refrigerant to the conduit, and as a result, the cooling function of the heat exchange system can be prevented from being lowered.
[0032]
Moreover, said heat exchange system can be used for cooling of the thermal radiation part of a Stirling refrigerator.
[0033]
In the Stirling refrigerator according to the present invention, the heat exchange system described above is mounted on the heat dissipating part of the Stirling refrigerator, and the heat dissipating part is cooled by the system.
[0034]
Thereby, the Stirling refrigerator provided in the refrigerator has a heat exchange system having a high cooling function. As a result, the coefficient of performance (COP; Coefficient of Performance) of the refrigerator is improved.
[0035]
DETAILED DESCRIPTION OF THE INVENTION
Below, the heat exchange system based on this invention and embodiment of the refrigerator provided with this system are described.
[0036]
As an example of the heat exchange system according to the present embodiment, there is a system for cooling a high temperature part (worm head) as a heat radiating part of the Stirling refrigerator 1 as shown in FIG. This heat exchange system includes an evaporator 3 and a condenser 4.
[0037]
The Stirling refrigerator 1 is supported by a support base 2. Moreover, the support stand 2 can support the Stirling refrigerator 1 by the support portion 2 </ b> A, and can fix the Stirling refrigerator 1 to an arbitrary location of a refrigerator such as a refrigerator using the Stirling refrigerator. Further, the evaporator 3 and the condenser 4 are included in a heat dissipation cycle of a high temperature portion generated by the operation of the Stirling refrigerator 1.
[0038]
Below, the structure of the Stirling refrigerator 1 will be described.
The Stirling refrigerator 1 includes a pressure vessel 5, a cylinder in the pressure vessel 5, a piston that reciprocates in the cylinder, a linear motor that drives the piston, a displacer that faces the piston in the cylinder, a piston and a displacer, Between the compression space, the expansion space on the opposite side of the piston with respect to the displacer, the back space on the opposite side of the displacer with respect to the piston, and the heat absorption part (low temperature part) on the opposite side of the displacer with respect to the expansion space And a worm head 7 as a heat radiating part (high temperature part) at the communicating part of the compression space and the expansion space.
[0039]
Here, the piston and the displacer are arranged coaxially, and the rod forming one end of the displacer passes through a sliding hole provided in the center of the piston. The piston and the displacer are elastically supported by the pressure vessel 5 on the back space side through springs.
[0040]
In the compression container 5 (compression space, expansion space and back space), an inert gas such as high-pressure helium gas is filled as a working medium. Further, the compression space and the expansion space are connected via a regenerator.
[0041]
Actually, when the Stirling refrigerator is operated, the piston is driven by the linear motor and reciprocates at a predetermined cycle. Thereby, the working medium is compressed / expanded in the working space (compression space and expansion space). The displacer reciprocates linearly by the pressure change accompanying the compression / expansion of the working medium. At this time, the piston and the displacer reciprocate at the same period with a predetermined phase difference.
[0042]
As a result of the above-described reciprocating motion, effects such as generation of cold in the cold head 6 can be obtained. At this time, heat generated by the compression is radiated to the outside of the Stirling refrigerator 1 through the worm head 7. Note that the reverse Stirling thermal cycle such as the principle of generating cold is generally well known, and the description thereof is omitted here.
[0043]
Below, the heat exchange cycle (heat dissipation cycle) of a high temperature part including the evaporator 3 and the condenser 4 is demonstrated.
[0044]
As shown in FIG. 1, this cycle is provided around the worm head 7, the evaporator 3 that absorbs the heat of the worm head 7 by evaporation of the refrigerant, and is disposed at a higher position than the evaporator 3. A natural circulation type including a condenser 4 for condensing the refrigerant in the state, a conduit 8 for leading the refrigerant from the evaporator 3 to the condenser 4, and a return pipe 9 for returning the liquid refrigerant from the condenser 4 to the evaporator 3. Circuit. Note that a refrigerant such as water (including an aqueous solution) or hydrocarbon is sealed in the circuit.
[0045]
In FIG. 1, the evaporator 3 includes evaporators 3 </ b> A and 3 </ b> B having a shape obtained by dividing an annular shape into a plurality of (two) parts.
[0046]
Here, the number of ring-shaped divisions is not limited to two. The ring shape of the evaporator 3 is not limited to the ring shape, and any ring shape (for example, a square ring shape) can be applied in accordance with the shape of the worm head.
[0047]
Moreover, the condenser 4 is provided with the bending pipe | tube 4A, the fin 4B, the conduit | pipe side header pipe 4C, and the return pipe | tube side header pipe 4D, as shown in FIG. Here, the bending pipe 4A connects the header pipes 4C and 4D, and the fin 4B is attached to the bending pipe 4A. The header pipes 4C and 4D are connected to a conduit 8 and a return tube 9, respectively.
[0048]
Next, the operation of the heat exchange cycle will be described.
The heat generated in the worm head 7 is transmitted from the worm head 7 to the evaporator 3 to evaporate the liquid refrigerant accumulated in the evaporator 3. The vapor | steam of the evaporated refrigerant | coolant flows in into the conduit | pipe 8 from the evaporator 3, raises this conduit | pipe 8, and flows in into the condenser 4 installed in the position higher than the evaporator 3. FIG. Thereafter, the gas refrigerant exchanges heat with the outside in the condenser 4, and most of the gas refrigerant is condensed.
[0049]
The refrigerant condensed in the condenser 4 (including the gas refrigerant that has not been condensed) moves down the return pipe 9. The condensed liquid refrigerant returns to the evaporator 3 and is evaporated again by the heat of the worm head 7 to exchange heat.
[0050]
By the way, the conventional heat dissipation system of the Stirling refrigerator is configured to cool the high temperature portion and promote heat dissipation by flowing water to the high temperature portion or blowing air.
[0051]
However, heat exchange using sensible heat of water and air as described above has a small amount of heat conduction, and power consumption is increased by driving external power for forced circulation of water and air. The heat exchange efficiency is reduced.
[0052]
In contrast, in the heat exchange system according to the present embodiment, by performing heat exchange using latent heat due to evaporation / condensation of the refrigerant, compared to heat exchange such as water cooling / air cooling using sensible heat, A heat transfer amount that is several tens of times larger can be obtained, and the heat exchange efficiency can be greatly improved.
[0053]
Further, in the above cycle, natural circulation utilizing the difference in height between the upper and lower arrangements of the evaporator 3 and the condenser 4 and the specific gravity difference between the gas (gas refrigerant) and the liquid (liquid refrigerant) can be obtained. . Therefore, external power such as a pump becomes unnecessary, and an energy saving effect can be obtained.
[0054]
By the way, when the above heat exchange cycle is operated in a sub-freezing environment, there may be problems such as breakage of piping due to freezing of the refrigerant. On the other hand, freezing can be made difficult to occur by lowering the freezing point using a refrigerant in which an additive containing, for example, ethanol or ethylene glycol is mixed in water. In this case, in consideration of dangerous factors such as flammability due to the additive, the proportion of ethanol or ethylene glycol in the refrigerant after the additive is mixed is preferably about 20 wt% or less.
[0055]
Next, the structure of the evaporator 3 and the attachment method to the Stirling refrigerator 1 will be described.
[0056]
The evaporator 3 is divided into two semi-circular evaporators 3A and 3B and combined with each other, as shown in FIG. 1, so that the evaporator 3 can be easily attached to the cylindrical worm head 7. A substantially annular shape corresponding to the cross-sectional shape of the high temperature part is formed. Further, a conduit 8 and a return pipe 9 are connected to each of the evaporators 3A and 3B.
[0057]
When actually attaching, first, the pair of semicircular evaporators 3A and 3B are closely attached to the periphery of the worm head 7 so as to form an annular shape. Then, one or a plurality of bands 10 are used to tighten from the periphery. Thereby, the annular evaporator 3 can be adhered and fixed to the worm head 7 without using screwing or caulking.
[0058]
Here, it is preferable to use heat transfer grease in order to improve the heat exchange efficiency of the heat dissipation cycle by bringing the worm head 7 and the evaporator 3 into closer contact.
[0059]
The liquid refrigerant condensed in the condenser 4 flows into the evaporator 3 via the return pipe 9 and exchanges heat with the worm head 7 when evaporating again in the evaporator 3 (heat is transferred from the worm head 7). Absorb).
[0060]
Here, the conduit 8 and the return pipe 9 are connected to a position where the refrigerant guided from the return pipe 9 contacts the upper portion (gas refrigerant region) of the inner peripheral surface of the evaporator 3. Since the liquid refrigerant dropped from the return pipe 9 above the evaporator is relatively low in temperature with respect to the liquid refrigerant in the evaporator, the cooling capacity is large. Since the gas refrigerant region is not filled with the liquid refrigerant, the gas refrigerant region has a higher temperature than the liquid refrigerant region. By cooling the high temperature portion with the liquid refrigerant dropped from the return pipe 9 having a large cooling capacity, the heat dissipation cycle is achieved. The cooling capacity can be improved.
[0061]
Here, the speed at which the refrigerant gasified in the evaporator 3 flows into the conduit 8 (as an example of the flow velocity, for example, about 30 m / s) is very large, and the condensed liquid refrigerant is returned from the return pipe 9 to the evaporator 3. The flow rate when dropping into the inside (for example, about 9 cc / min as an example of the flow rate) is relatively small. As a result, the liquid refrigerant flowing into the evaporator 3 may flow into the conduit 8 in the liquid state together with the gas refrigerant having a large flow rate. At this time, since sufficient liquid refrigerant is not supplied into the evaporator 3, the liquid level of the evaporator 3 is lowered, and the liquid refrigerant from the return pipe 9 enters the gas refrigerant region on the inner peripheral surface of the evaporator 3. Since it does not contact, a cooling function may fall.
[0062]
On the other hand, in the heat exchange system according to the present embodiment, for example, as shown in FIG. 2 or FIG. 3, in the evaporator 3, the opening 9A of the return pipe 9 and the inner peripheral surface 11A of the evaporator 3 are connected. The distance between them is smaller than the distance between the opening 8A of the conduit 8 and the inner peripheral surface 11A. Here, the above-mentioned distance means a linear distance obtained by connecting the openings 8A and 9A and the inner peripheral surface 11A with a straight line.
[0063]
Heat exchange in the evaporator 3 is most actively performed in the vicinity of the contact portion between the evaporator 3 and the worm head 7, that is, in the vicinity of the inner peripheral surface of the evaporator 3. As described above, by bringing the opening of the return pipe 9 closer to the inner peripheral surface 11A of the evaporator 3, the liquid refrigerant flowing into the evaporator 3 easily reaches the inner peripheral surface of the evaporator 3, The cooling function is prevented from being lowered due to the refrigerant flowing into the conduit 8 in a liquid state.
[0064]
Hereinafter, the structures of the conduit 8 and the return pipe 9 will be described in more detail.
[0065]
As an example of the structure of the conduit 8 and the return pipe 9 described above, as shown in FIG. 2, the conduit 8 and the return pipe 9 are connected to the outer peripheral surface 11 of the evaporator 3, and the return pipe 9 evaporates more than the conduit 8. The structure which protrudes in the inner peripheral surface 11A side of the container 3 is mentioned. At this time, it is preferable that the tip of the return pipe 9 is separated from the inner peripheral surface 11A of the evaporator 3 by about 3 mm. If the distance between the tip and the inner peripheral surface 11A is too close, the flow resistance becomes a problem.
[0066]
As another example, as shown in FIG. 3, the conduit 8 may be connected to the outer peripheral surface 11 of the evaporator 3, and the return pipe 9 may be connected to the axial end surface 12 of the evaporator 3. .
[0067]
Thus, in the heat exchange system according to the present embodiment, a plurality of variations can be selected for the structure of the conduit 8 and the return pipe 9 connected to the evaporator 3 with respect to the structural limitations of the entire device. is there.
[0068]
When the return pipe 9 is connected to the axial end face 12 of the evaporator 3, the return pipe 9 is connected to the end face 12 on the opposite side in the axial direction with respect to the cold head 6 arrangement side as the heat absorbing portion of the evaporator 3. It is preferable that it is (refer FIG. 1).
[0069]
Thereby, it is possible to prevent the temperature of the cold head 6 from rising due to heat transfer from the refrigerant having a relatively high temperature with respect to the cold head 6, and to improve the heat exchange efficiency of the Stirling refrigerator.
[0070]
When the above Stirling refrigerator and the heat exchange system are operated, as shown in FIGS. 2 and 3, the liquid refrigerant region 13 is evaporated in the lower portion of the evaporator 3 and the upper portion is evaporated with the liquid surface 13A as a boundary. The gas refrigerant region 14 thus formed is formed. Here, the return pipe 9 is a circumferential end face 15 (a circumferential end face closer to the conduit 8) of the gas refrigerant region 14 than the conduit 8. In FIGS. 2 and 3, the circumferential end face is illustrated. It is preferably not connected and is connected to the evaporator 3 on the side.
[0071]
This makes it difficult for the liquid refrigerant flowing into the evaporator 3 from the return pipe 9 to be caught in the gas flow flowing from the evaporator 3 into the conduit 8. Therefore, it is possible to prevent the supply of the liquid refrigerant to the evaporator 3 from being insufficient and the cooling function of the heat dissipation cycle from being lowered.
[0072]
Further, as shown in FIG. 4, the return pipe 9 is connected to the outer peripheral surface 11, bent inside the evaporator 3, and in a direction intersecting the axial end surface 12 of the evaporator 3 inside the evaporator 3. As shown in FIG. 5, the structure may extend, bend outside the evaporator 3, be connected to the axial end face 12, and be connected to the axial end face 12, and the axial end face 12 of the evaporator 3 inside the evaporator 3. The structure may extend in a direction intersecting with.
[0073]
4 and 5, the return pipe 9 extends over substantially the entire axial direction in the evaporator 3, but this may be a partial extension.
[0074]
As described above, by extending the return pipe 9 in a direction crossing the axial end face 12 of the evaporator 3, the outside of the evaporator 3 has the same structure as that shown in FIGS. An opening 9A of the return pipe 9 can be provided at an arbitrary axial position. Therefore, the liquid refrigerant can be easily dropped at a position where it is more difficult to be caught by the gas flow flowing into the conduit 8, and the effect of preventing the liquid refrigerant from flowing back to the conduit 8 can be enhanced.
[0075]
In this case, the return pipe 9 preferably has a plurality of openings 9 </ b> A inside the evaporator 3 as shown in FIGS. 4 and 5.
[0076]
Thereby, the condensed liquid refrigerant can be dispersed and dropped in the axial direction of the evaporator 3. Therefore, the liquid refrigerant can be brought into wide contact with the inner peripheral surface 11A, and the cooling effect of the heat dissipation cycle can be enhanced.
[0077]
Furthermore, it is preferable to increase the diameter of the plurality of openings 9A from the upstream side of the return pipe 9 toward the downstream side. Thereby, the liquid refrigerant is likely to be dripped also on the downstream side of the return pipe 9 having a large flow path resistance. Therefore, it is possible to disperse the dropping amount from each opening 9A in a balanced manner.
[0078]
As a modification of the evaporator 3, as shown in FIG. 6, a liquid refrigerant that prevents the liquid refrigerant from flowing into the conduit 8 below the opening 8 </ b> A of the conduit 8 in the evaporator 3. A structure including an inflow preventing plate 16 as an inflow preventing portion is conceivable.
[0079]
This may result in very large bubbles when the refrigerant evaporates in the evaporator 3. At that time, the liquid refrigerant in the liquid refrigerant region is lifted as the bubbles rise, and a part of the scattered liquid refrigerant may flow into the conduit 8 in a liquid state. When such a phenomenon occurs, the amount of liquid refrigerant in the evaporator 3 decreases, so that the cooling capacity decreases. According to this modification, the above phenomenon can be prevented by the action of the inflow preventing plate 16. Therefore, it is possible to prevent the cooling function from being lowered.
[0080]
Further, as another modification of the evaporator 3, as shown in FIG. 7, separately from the return pipe 9, it is connected to a plurality of parts of the evaporator 3, and a plurality of parts of the evaporator 3 are connected. And the structure provided with the connection pipe | tube 17 which accept | permits the flow of the liquid refrigerant between these several parts can be considered.
[0081]
Thereby, since the liquid level imbalance of the refrigerant of the plurality of evaporators 3 (two in FIG. 7) can be adjusted, the lowering of the liquid level of each evaporator 3 is buffered, resulting in a heat release cycle. It is possible to suppress a decrease in the cooling function.
[0082]
In the heat exchange system according to the present embodiment, the evaporator 3 is not limited to one divided into a plurality of parts, and may have an annular shape as shown in FIG. In this case, the first and second conduits 8B and 8C connected to the evaporator 3 are provided, and the evaporator 3 is connected between the connection positions of the conduits 8B and 8C and the evaporator 3 as shown in FIG. It is preferable to connect the return pipe 9.
[0083]
Thereby, the condensed liquid refrigerant (broken arrow in FIG. 8) dropped from the return pipe 9 to the evaporator 3 flows when the gas refrigerant evaporated from the liquid surface 13A flows into the conduit 8 (in FIG. 8). The solid line arrow) is less likely to be involved, and the lowering of the liquid level in the evaporator 3 due to the backflow of the refrigerant to the conduit 8 is suppressed, and as a result, the cooling function of the heat dissipation cycle can be prevented from being lowered. .
[0084]
FIG. 9 shows an example of a Stirling refrigerator equipped with a Stirling refrigerator having the heat exchange system described above.
[0085]
The refrigerator 18 shown in FIG. 9 includes at least one of a refrigerated space and a refrigerated space as a cooling space. Further, the refrigerator 18 includes the above-described heat exchange system (broken line in FIG. 9) as a high temperature side heat transfer cycle (heat dissipation system) for cooling the worm head of the Stirling refrigerator, and further, the inside of the refrigerator and the Stirling are provided. It has a low-temperature side heat transfer cycle (heat absorption system) that exchanges heat with the cold head of the refrigerator.
[0086]
The low temperature side heat transfer cycle is connected to the low temperature side condenser 19 by a low temperature side condenser 19 attached in contact with the periphery of the cold head 6 (see FIG. 1), a low temperature side return pipe 20 and a low temperature side pipe 21. It is the circulation circuit comprised from the low temperature side evaporator 22 made. In this circuit, carbon dioxide, hydrocarbons, and the like are sealed as a refrigerant. Here, the low-temperature side evaporator 22 is disposed below the low-temperature side condenser 19 so that the cold heat generated in the cold head 6 can be transmitted using natural circulation caused by the evaporation and condensation of the refrigerant. Yes.
[0087]
As shown in FIG. 9, the Stirling refrigerator is arranged at the upper part of the back surface of the refrigerator 18. Further, the heat absorption system is disposed on the back side of the refrigerator 18, and the heat dissipation system is disposed on the upper side of the refrigerator 18. The low-temperature side evaporator 22 is installed in a cool air duct 23 provided in the back portion of the cooler 18, and the condenser 4 is installed in a duct 24 provided in the upper part of the cooler 18.
[0088]
When the Stirling refrigerator 1 is operated, heat generated by the worm head 7 (see FIG. 1) is exchanged with air in the duct 24 via the condenser 4. At this time, warm air in the duct 24 is discharged outside the cooler 18 by the blower fan 25, and air outside the cooler 18 is taken in to promote heat exchange.
[0089]
On the other hand, the cold generated in the cold head 6 is heat-exchanged with the air current (arrow in FIG. 9) in the cold air duct 23 via the low temperature side evaporator 22. At this time, the cold air cooled by the low-temperature side evaporator 22 is sent to the freezing space 28 and the refrigerating space 29 by the refrigerating space side fan 26 and the refrigerating space side fan 27, respectively. The warmed airflow from the cooling spaces 28 and 29 is sent again to the low temperature side evaporator 22 through the cold air duct 23 and repeatedly cooled.
[0090]
The Stirling refrigerator provided in the refrigerator 18 has a heat dissipation cycle with a high cooling function due to the above-described configuration, and as a result, the coefficient of performance of the refrigerator can be improved.
[0091]
The device to which the heat exchange system according to the present embodiment can be applied is not limited to the above Stirling refrigerator, and can be applied to any device having a heat source having a similar shape. Specifically, cooling of a thyristor used in a train or the like, cooling of a mold, etc. can be considered.
[0092]
In the heat exchange system described above, it is planned from the beginning to obtain a combined effect by combining the above-described respective characteristic portions.
[0093]
Although the embodiments of the present invention have been described above, the embodiments disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[0094]
【The invention's effect】
According to the present invention, since it is possible to suppress a decrease in the liquid level of the refrigerant in the evaporator, it is possible to provide a heat exchange system with high cooling efficiency and a Stirling refrigerator with a high coefficient of performance.
[Brief description of the drawings]
FIG. 1 is a perspective view of a Stirling refrigerator equipped with a heat exchange system according to one embodiment of the present invention.
FIG. 2 is a perspective cross-sectional view of an evaporator in a heat exchange system according to one embodiment of the present invention.
FIG. 3 is a perspective sectional view of a modified example of the evaporator in the heat exchange system according to one embodiment of the present invention.
FIG. 4 is a perspective cross-sectional view of an evaporator in which a return pipe extends in a direction intersecting an axial end face in a heat exchange system according to one embodiment of the present invention.
FIG. 5 is a perspective cross-sectional view of a modified example of an evaporator in which a return pipe extends in a direction intersecting an axial end surface in the heat exchange system according to one embodiment of the present invention.
FIG. 6 is a perspective sectional view of an evaporator having a liquid refrigerant inflow prevention plate in the heat exchange system according to one embodiment of the present invention.
FIG. 7 is a perspective view of a heat exchange system with an evaporator having a connecting tube, according to one embodiment of the present invention.
FIG. 8 is a schematic view of another modification of the evaporator in the heat exchange system according to one embodiment of the present invention.
FIG. 9 is a side cross-sectional view of a Stirling refrigerator equipped with a heat exchange system according to one embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stirling refrigerator, 2 support stand, 2A support part, 3,3A, 3B evaporator, 4 condenser, 4A bending pipe, 4B fin, 4C conduit side header pipe, 4D return pipe side header pipe, 5 pressure vessel, 6 Cold head, 7 worm head, 8 conduit, 8A opening (conduit), 8B first conduit, 8C second conduit, 9 return tube, 9A opening (return tube), 10 band, 11 outer peripheral surface, 11A Circumferential surface, 12 axial end surfaces, 13 liquid refrigerant region, 13A liquid surface, 14 gas refrigerant region, 15 circumferential end surface, 16 inflow prevention plate, 17 connecting pipe, 18 cooler, 19 low temperature side condenser, 20 low temperature side return Pipe, 21 Low temperature side conduit, 22 Low temperature side evaporator, 23 Cold air duct, 24 duct, 25 Blower fan, 26 Refrigerating space side fan, 27 Refrigerating space side fan, 28 Refrigerating space, 29 Refrigerating space.

Claims (11)

An evaporator provided around the heat dissipating unit and evaporating the refrigerant inside;
A condenser for condensing the refrigerant;
A conduit for leading the refrigerant from the evaporator to the condenser;
A heat exchange system comprising a return pipe for returning the refrigerant condensed in the condenser from the condenser to the evaporator,
In the evaporator, the distance between the opening of the return pipe and the inner peripheral surface of the evaporator is a heat exchange system smaller than the distance between the opening of the conduit and the inner peripheral surface. An evaporator that is provided around the heat dissipating unit and that evaporates an internal refrigerant;
A condenser for condensing the refrigerant;
A conduit for leading the refrigerant from each of the divided evaporators to the condenser;
A heat exchange system comprising a return pipe for returning the refrigerant condensed in the condenser from the condenser to each evaporator,
The return pipe is a heat exchange system connected to a circumferential end face side of each evaporator closer to the conduit than the conduit. An evaporator divided into a plurality of parts;
A condenser that condenses the refrigerant,
A conduit for leading the refrigerant from each of the divided evaporators to the condenser;
A return pipe for returning the refrigerant condensed in the condenser from the condenser to each evaporator;
A heat exchange system comprising: a plurality of evaporators connected to each other, and a connecting pipe that allows liquid refrigerant to flow between the evaporators. The conduit and the return pipe are connected to an outer peripheral surface of the evaporator;
The heat exchange system according to any one of claims 1 to 3, wherein the return pipe protrudes toward the inner peripheral surface side of the evaporator from the conduit. The heat exchange system according to any one of claims 1 to 3, wherein the conduit is connected to an outer peripheral surface of the evaporator, and the return pipe is connected to an axial end surface of the evaporator. The heat exchange system according to claim 5, wherein the return pipe is connected to the axial end surface opposite to the heat absorption part of the refrigerator. The heat exchange system according to claim 5, wherein the return pipe extends in a direction intersecting an axial end surface of the evaporator inside the evaporator. The heat exchange system according to claim 4, wherein the return pipe has a plurality of openings inside the evaporator. An evaporator provided around the heat dissipating unit and evaporating the refrigerant inside;
A condenser for condensing the refrigerant;
A conduit for leading the refrigerant from the evaporator to the condenser;
A return pipe for returning the refrigerant condensed in the condenser from the condenser to the evaporator;
A heat exchange system comprising a refrigerant inflow prevention unit for preventing liquid refrigerant from flowing into the conduit in the evaporator. An evaporator provided around the heat dissipating unit and evaporating the refrigerant inside;
A condenser for condensing the refrigerant;
First and second conduits leading the refrigerant from the evaporator to the condenser;
A heat exchange system comprising a return pipe for returning the refrigerant condensed in the condenser from the condenser to the evaporator,
A heat exchange system in which the evaporator and the return pipe are connected between connection positions of the first and second conduits with the evaporator. The Stirling cooler which mounts the evaporator of the heat exchange system in any one of Claims 1-10 on the thermal radiation part of a Stirling refrigerator, and cools the said thermal radiation part with this system.

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