JP2004128013A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger which can heat exchange a large amount of heat at a small amount of air. <P>SOLUTION: The heat exchanger 1 heat exchanges by moving a medium and includes a first route 2 for moving the medium, and a second route 3 connected to the first route for locally moving the medium. Further, the exchanger includes one medium moving means 4 for moving the medium, circulates the medium in the second route by the moving means, and moves the medium in the first route. The exchanger may include two or more medium moving means for moving the medium in such a manner that the medium moving means 5 for moving the medium in the second route and the medium moving means for moving the medium in the first route are respectively made of another medium moving means. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heat exchanger, and more particularly to a heat exchanger capable of exchanging a large amount of heat with a low air flow.
[0002]
[Prior art]
Although the present invention can be applied to various heat exchangers, cooling of electronic components will be described as an example.
Electronic components such as semiconductor elements mounted on electric and electronic devices such as personal computer CPUs, laser light emitting diodes, and power transistors are inevitable to generate a certain amount of heat due to their use. It is an important technical issue.
[0003]
The above-mentioned electric / electronic device is usually housed in a housing, and cool air taken in from the air intake of the housing is passed between the above-mentioned electric / electronic devices, and the heated air is exhausted from the housing. It is discharged from the outlet to cool the inside of the housing.
[0004]
For example, Japanese Patent Laying-Open No. 2001-57492 discloses a device and a method for cooling a housing for housing a heating element. That is, as shown in FIG. 4, the housing 121 is provided with an outside air intake 129, the exhaust fan 122 is provided on the side of the housing facing the outside air intake, and heat is dissipated near the exhaust fan. A finned heat sink 126 is provided. A heating element 128 is provided inside the housing, and heat of the heating element is transferred to the heat sink by the heat pipe 127.
[0005]
When the exhaust fan is operated, the outside air taken in from the outside air intake passes through the inside of the housing, and hits a heat sink arranged near the exhaust fan to cool the radiation fins. Thus, the heating element is moved to the heat sink, and the heat sink is cooled.
Japanese Patent Application Laid-Open No. 2001-57492 further discloses that a heat sink provided with a radiating fin is arranged near an outside air intake, heat of a heating element is moved to a position of the heat sink by a heat pipe, and the coolest outside air is transferred to the radiating fin. A cooling device that cools a heat generating element by discharging air that has been blown to the outside of the housing and exhausting the heated air to the outside of the housing by a fan from an exhaust port provided on the side of the housing that faces the outside air intake port.
[0006]
FIG. 5 is a diagram illustrating the cooling principle of the above-described conventional cooling device. FIG. 5A is a diagram illustrating a comb heat sink. FIG. 5B is a diagram illustrating a cooling state in the housing. As shown in FIG. 5B, for example, the outside air taken in from the inlet 103 moves toward the outlet 104 between the radiating fins 102 of the comb-shaped heat sink 101 to cool the radiating fins.
According to the above-described conventional cooling device, when the amount of heat generated by the heating element increases, the amount of air taken in from the air intake and discharged from the exhaust port increases. That is, as much outside air as possible is blown to the radiating fins, and the heat of the heating elements is released. Accordingly, there is a concern that noise of the exhaust fan increases.
[0007]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2001-57492
[Problems to be solved by the invention]
As described above, when heat exchange with a larger amount of heat is performed, a method of increasing the amount of air is required, and accordingly, noise increases. Therefore, there is a problem that the above-described cooling device cannot be used in a quiet environment where silence is required.
Therefore, an object of the present invention is to provide a heat exchanger capable of exchanging heat with a large amount of heat at a low air flow.
[0009]
[Means for Solving the Problems]
The inventor has diligently studied to solve the above-mentioned conventional problems. As a result, if the heat exchanger is provided with a first path for circulating the medium over the entire inside thereof and a second path connected to the first path to locally circulate the medium, a low air flow rate can be obtained. It has been found that a larger heat exchange is possible. That is, in the conventional cooling device, the air taken in from the air inlet is discharged from the outlet only by passing through the heat exchanger once (that is, one pass).
[0010]
Therefore, the efficiency of heat exchange per fixed displacement is poor, and the air whose temperature has not risen so much is discharged from the discharge port. In order to increase the efficiency of heat exchange, the outside air taken into the housing is locally recirculated at a predetermined position and then recirculated to the entire inside of the housing, thereby reducing the air volume and thereby exchanging a larger heat exchange. It turns out that you can.
[0011]
The present invention has been made based on the above research results, and a first aspect of the heat exchanger of the present invention is a heat exchanger that performs heat exchange by moving a medium, in which the medium is moved. A heat exchanger including a first path and a second path connected to the first path to locally move a medium.
[0012]
A second aspect of the heat exchanger of the present invention includes one medium moving means for moving the medium, wherein the medium moving means recirculates the medium in the second path, and A heat exchanger for moving the medium in a path.
[0013]
A third aspect of the heat exchanger according to the present invention includes two or more medium moving means for moving the medium, a medium moving means for moving the medium in the second path, and a medium moving means for moving the medium in the second path. Wherein the medium moving means for moving the medium comprises different medium moving means.
[0014]
According to a fourth aspect of the heat exchanger of the present invention, at least a part of the medium moving in the first path is taken in the second path, and the medium is refluxed in the second path. A heat exchanger for moving the refluxed medium in the first path.
[0015]
A fifth aspect of the heat exchanger according to the present invention is the heat exchanger, wherein a flow rate of the medium in the second path is larger than a flow rate of the medium in the first path.
[0016]
A sixth aspect of the heat exchanger according to the present invention is a heat exchanger provided with a shielding plate along the second path.
[0017]
A seventh aspect of the heat exchanger according to the present invention is a heat exchanger, wherein the heat exchanger comprises a heat sink.
[0018]
An eighth aspect of the heat exchanger according to the present invention is a heat exchanger, wherein the heat exchanger comprises an air conditioner.
[0019]
A ninth aspect of the heat exchanger of the present invention is a heat exchanger, wherein the heat exchanger comprises a refrigerator.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
The heat exchanger of the present invention will be described in detail with reference to the drawings.
One aspect of the heat exchanger of the present invention is a heat exchanger that performs heat exchange by moving a medium, the medium including a first path that moves the medium, and a medium that is connected to the first path to locally transfer the medium. And a second path for moving the heat exchanger. That is, when the medium is passed through the housing and heat exchange is performed, a second path for locally returning a main part of the medium is provided, and the temperature in the second path is increased to a predetermined temperature, or Lower and move to the first path. That is, the medium is moved at a low air flow, and heat exchange is performed efficiently.
[0021]
The heat exchanger according to the present invention includes one medium moving means for moving the medium, and the medium moving means moves the medium in the second path and moves the medium in the first path. The apparatus further comprises two or more medium moving means for moving the medium, wherein the medium moving means for moving the medium in the second path and the medium moving means for moving the medium in the first path are different mediums. It may consist of transportation means.
[0022]
FIG. 1 is a diagram illustrating one embodiment of the heat exchanger of the present invention. As shown in FIG. 1, a heat exchanger 1 according to the present invention has a first path 2 for moving a medium over the entire inside thereof, and a second path connected to the first path to locally return the medium. And medium moving means 4 for moving the medium in the second path 3 and medium moving means 4 for moving the medium in the second path 3. The means 5 and the medium 5 are different medium moving means.
[0023]
In the heat exchanger of this embodiment, for example, outside air is taken into the heat exchanger as shown by the arrow 6 by the medium moving means 5, and a major part thereof is taken into the second path as shown by the arrow 8, The rest moves in the first route. The outside air taken into the second path is returned to the outside of the heat exchanger by the medium moving means 5 as shown by an arrow 9 after being returned in the second path by the medium moving means 4.
[0024]
In the heat exchanger of the present invention, the outside air is taken into the heat exchanger by the medium moving means and moved inside the heat exchanger, and is not taken out of the heat exchanger as in the conventional heat exchanger, but is taken into the heat exchanger. A major part of the outside air is taken into a second path for locally returning the air, and is returned in the second path to discharge the heated outside air (medium) to the first path for movement. Therefore, the amount of outside air taken into the heat exchanger may be small. As a result, noise can be reduced while satisfying a predetermined cooling effect.
[0025]
That is, in a so-called one-pass type conventional heat exchanger in which outside air is taken into the heat exchanger by the medium moving means, moved inside the heat exchanger, and discharged outside the heat exchanger, for example, 25 ° C. outside air is introduced into the heat exchanger. Since the temperature at the place where the heat-generating components are located is set at about 40 ° C., the temperature is raised to about 40 ° C., and the heated air at about 40 ° C. is discharged out of the heat exchanger. In this case, a large amount of outside air is taken in and discharged in order to keep the temperature at the place where the heat-generating component is located at about 40 ° C. Therefore, the air volume is extremely large, and the noise increases. Furthermore, since the temperature is suppressed to about 40 ° C., cooling is performed more than necessary, which is a so-called supercooling state, and the cooling efficiency is poor.
[0026]
However, in the heat exchanger of the present invention, for example, the local temperature rise is set to about 60 ° C., the outside air at 25 ° C. is taken into the heat exchanger, and a major part of the taken outside air is locally used in the second path. Then, the air is heated to a temperature of 60 ° C., and the air heated to a temperature of 60 ° C. is discharged out of the heat exchanger through the first path. Therefore, since cooling is performed using a small amount of air efficiently, noise can be reduced. Moreover, since the local temperature rise is about 60 ° C., the cooling efficiency is excellent without excessive cooling.
[0027]
As described above, in the heat exchanger of the present invention, at least a part of the medium (outside air) moving in the first path is taken in the second path, refluxed in the second path, and returned in the second path. The refluxed medium is moved in the first path. When the flow rate of the medium in the second path is higher than the flow rate of the medium in the first path, heat can be exchanged more efficiently.
[0028]
The first path may be formed so as to flow through the entire housing, and the second path may be formed by dividing a predetermined region in the housing with a predetermined material. It is preferable to use a material having excellent thermal conductivity as the material to be divided. Further, the second path may be composed entirely of a heat sink. For example, a closed space having an air inlet for taking in air and an air outlet for discharging air may be formed, and a heat sink with a radiating fin may be provided therein. In this case, the air taken in from the air intake recirculates between the radiating fins, and after the temperature rises to a predetermined temperature, is discharged from the air outlet to the first path, and the heated air is discharged to the first path. It moves along the route and is discharged out of the housing.
[0029]
In the heat exchanger of the embodiment shown in FIG. 1, the medium moving means for circulating the medium in the second path and the medium moving means for moving the medium in the first path are respectively different medium moving means. However, the medium may be moved in the first path and the medium may be returned in the second path by one medium moving means. As the medium moving means, for example, a fan can be used. When the medium is moved in the first path by one medium moving means and the medium is recirculated in the second path, for example, about 80% of the outside air taken in is taken in the second path. , The remaining 20% may move along the first route. That is, about 80% of the taken-in outside air is taken into the second path and recirculates in the second path, rises to a predetermined temperature, and the remaining 20% moves on the first path as it is.
[0030]
The embodiment shown in FIG. 1 can be used as, for example, a cooler in addition to the above. In this case, since the heat exchanger disposed in the room has a path for circulating the air, the heat can be sufficiently exchanged even when the indoor side has a low wind speed. Therefore, not only can noise be reduced, but also cooling and heating do not feel uncomfortable due to strong wind, and sufficient cooling or heating capacity can be exhibited. Further, this technique can be used as an outdoor unit.
[0031]
FIG. 2 is a diagram illustrating another embodiment of the heat exchanger of the present invention. As shown in FIG. 2, the heat exchanger 10 of the present invention includes a first path 12 for moving a medium over the entire inside thereof, and a second path for connecting the first path and moving the medium locally. 13, further comprising two medium moving means for moving the medium, the medium moving means 14 for moving the medium in the second path 13, and the medium moving for moving the medium in the first path 12 The means 15 and the medium 15 are different from each other.
[0032]
In the heat exchanger of this aspect, for example, a major part of the air in the housing is taken into the second path as shown by an arrow 19, and the rest moves in the first path. The air taken into the second path is returned to the outside of the second path by the medium moving means 15 as shown by an arrow 12 after being returned in the second path by the medium moving means 14.
[0033]
In the heat exchanger of the present invention, the second path for locally moving a major part of the air in the heat exchanger, instead of moving the air in the heat exchanger by the medium moving means as in the conventional heat exchanger. And the air is refluxed in the second path, and the cooled air is discharged and moved to the first path. Therefore, the amount of air flowing through the heat exchanger may be small. As a result, noise can be reduced while satisfying a predetermined cooling effect.
[0034]
That is, in the so-called one-pass type conventional heat exchanger in which air is moved in the heat exchanger by the medium moving means, for example, in order to reduce the temperature in the heat exchanger to a predetermined temperature, it is necessary to increase the air volume, Therefore, the wind speed increases and noise increases. Further, the cooling efficiency is reduced because the whole is only moved by the one-pass method. However, in the heat exchanger of the present invention, for example, a major part of the air is locally moved in the second path, so that the temperature of the local part can be lowered. Therefore, the air having a locally reduced temperature in the second path can be moved to the first path, so that the cooling is performed using a small amount of air efficiently, so that the noise can be reduced. In addition, since the local temperature is efficiently reduced, the cooling efficiency is excellent.
[0035]
The heat exchanger of the embodiment shown in FIG. 2 can be used as a refrigerator. Refrigerators are characterized by high pressure loss inside the refrigerator. By using the heat exchanger of the embodiment shown in FIG. 2, it is possible to reduce the wind speed, and reduce the wind speed inside the refrigerator while maintaining sufficient cooling capacity. Can be.
Also in the heat exchanger of the embodiment shown in FIG. 2, the medium moving means for moving the medium in the second path and the medium moving means for moving the medium in the first path are respectively different medium moving means. However, one medium moving means may move the medium in the first path and move the medium in the second path. As the medium moving means, for example, a fan can be used.
[0036]
When the medium is moved in the first path and the medium is returned in the second path by one medium moving means, for example, about 80% of the air is taken into the second path, and the remaining 20% may be set to move on the first route. That is, about 80% of the air at the predetermined temperature is taken into the second path and recirculates in the second path, lowers to the predetermined temperature, and the remaining 20% moves on the first path as it is.
The first path may be formed so as to flow through the entire housing, and the second path may be formed by dividing a predetermined region in the housing with a predetermined material. It is preferable to use a material having excellent thermal conductivity as the material to be divided.
[0037]
FIG. 3 is a diagram illustrating another embodiment of the heat exchanger of the present invention. As shown in FIG. 3, the heat exchanger 30 of the present invention includes a first path 32 for moving the medium over the entire inside thereof, and a second path for connecting the first path and moving the medium locally. 33, further comprising two medium moving means for moving the medium, a medium moving means for moving the medium in the second path 33, and a medium moving means for moving the medium in the first path 32 The means 35 and the medium 35 are different medium moving means.
[0038]
In the heat exchanger of this embodiment, for example, outside air is taken into the heat exchanger as shown by the arrow 36 by the medium moving means 35, and a major part thereof is taken into the second path 33 as shown by the arrow 38. The rest move in the first path 32. The outside air taken into the second path 33 is returned to the outside of the heat exchanger by the medium moving means 35 as shown by an arrow 39 after being returned in the second path 33 by the medium moving means 34.
[0039]
In the heat exchanger of this embodiment, the outside air is taken into the heat exchanger by the medium moving means as in a conventional heat exchanger, and is moved in the heat exchanger by a so-called one-pass method, instead of being discharged to the outside of the heat exchanger. A major part of the outside air taken into the heat exchanger is taken into a second path for locally moving, and refluxed in the second path, and the heated outside air (medium) is discharged and moved to the first path. Let it. Therefore, the amount of outside air taken into the heat exchanger may be small. As a result, noise can be reduced while satisfying a predetermined cooling effect.
[0040]
That is, in a so-called one-pass type conventional heat exchanger in which outside air is taken into the heat exchanger by the medium moving means, moved inside the heat exchanger, and discharged outside the heat exchanger, for example, 25 ° C. outside air is introduced into the heat exchanger. Since the temperature at the place where the heat-generating components are located is set at about 40 ° C., the temperature is raised to about 40 ° C., and the heated air at about 40 ° C. is discharged out of the heat exchanger. In this case, a large amount of outside air is taken in and discharged in order to keep the temperature at the place where the heat-generating component is located at about 40 ° C. Therefore, the air volume is extremely large, and the noise increases. Furthermore, since the temperature is suppressed to about 40 ° C., cooling is performed more than necessary, which is a so-called supercooling state, and the cooling efficiency is poor.
[0041]
However, in the heat exchanger of the present invention, for example, the local temperature rise is set to about 60 ° C., the outside air at 25 ° C. is taken into the heat exchanger, and a major part of the taken outside air is locally used in the second path. Then, the air is heated to a temperature of 60 ° C., and the air heated to a temperature of 60 ° C. is discharged out of the heat exchanger through the first path. Therefore, since cooling is performed using a small amount of air efficiently, noise can be reduced. Moreover, since the local temperature rise is about 60 ° C., the cooling efficiency is excellent without excessive cooling.
[0042]
As described above, in the heat exchanger of the present invention, at least a part of the medium (outside air) moving in the first path is taken in the second path, and the medium is refluxed in the second path. The refluxed medium is moved in the first path. When the flow rate of the medium in the second path is higher than the flow rate of the medium in the first path, heat can be exchanged more efficiently.
[0043]
The first path may be formed so as to flow through the entire housing, and the second path may be formed by dividing a predetermined region in the housing with a predetermined material. It is preferable to use a material having excellent thermal conductivity as the material to be divided. Further, as shown in FIG. 3, a second path may be provided in a direction orthogonal to the first path. Further, the second path may be composed entirely of a heat sink. For example, a closed space having an air inlet for taking in air and an air outlet for discharging air may be formed, and a heat sink with a radiating fin may be provided therein. In this case, the air taken in from the air intake recirculates between the radiating fins, and after the temperature rises to a predetermined temperature, is discharged from the air outlet to the first path, and the heated air is discharged to the first path. It moves along the route and is discharged out of the housing.
[0044]
In the heat exchanger of the embodiment shown in FIG. 3, the medium moving means for moving the medium in the second path and the medium moving means for moving the medium in the first path are respectively different medium moving means. However, one medium moving means may move the medium in the first path and move the medium in the second path. As the medium moving means, for example, a fan can be used. When the medium is moved in the first path and the medium is moved in the second path by one medium moving means, for example, about 80% of the taken in outside air is taken in the second path. , The remaining 20% may move along the first route. That is, about 80% of the taken-in outside air is taken into the second path and recirculates in the second path, rises to a predetermined temperature, and the remaining 20% moves on the first path as it is.
[0045]
The embodiment shown in FIG. 1 can be used, for example, as a housing for an electronic device. According to the heat exchanger of the present invention, the wind speed can be reduced to 1/3 of the conventional one with the same cooling capacity as the conventional one, and the noise can be reduced from 38 dB to 26 dB to reduce the noise. The fan as the medium moving means may be driven by an external motor via a mechanical component such as a shaft or a belt.
As described above, the heat exchanger of the present invention takes at least a part of the medium moving in the first path into the second path, refluxes the medium in the second path, and refluxes the medium in the second path. Media in the first route, not only personal computers, but also printers, projectors, servers, PDP TVs, copiers, home game machines, industrial computers, medical computers, circulators for clean rooms, It can be widely used in fields such as industrial heat exchangers.
[0046]
【The invention's effect】
According to the present invention, the taken-in medium is not moved in the housing by a so-called one-pass method, but is connected to the first path for moving the medium over the entire inside thereof and the first path, and the medium is locally moved. Since it has the second path for moving, the medium can be moved at a low speed and heat exchange can be performed efficiently, so that unlike the conventional idea, the heat can be exchanged with a small amount of air and a large amount of heat can be exchanged. An exchange can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating one embodiment of the heat exchanger of the present invention.
FIG. 2 is a diagram illustrating another embodiment of the heat exchanger of the present invention.
FIG. 3 is a diagram illustrating another embodiment of the heat exchanger of the present invention.
FIG. 4 is a diagram illustrating a conventional cooling device for a housing that houses a heating element.
FIG. 5 is a diagram illustrating the cooling principle of the above-described conventional cooling device.
[Explanation of symbols]
1. Heat exchanger 2. First path 3. Second path 4. Medium moving means 5. Medium moving means 6. 6. Media flow Media flow 8. Media flow 9. Medium flow10. Heat exchanger 12. First path 13. Second path 14. Medium moving means 15. Medium moving means 17. Media flow 19. Media flow 30. Heat exchanger 32. First path 33. Second path 34. Medium moving means 35. Medium moving means 36. Media flow 37. Media flow 38. Media flow 39. Media flow

Claims (9)

A heat exchanger that performs heat exchange by moving a medium, the heat exchanger including a first path that moves a medium, and a second path that is connected to the first path and moves the medium locally. Heat exchanger. 2. A medium moving means for moving the medium, wherein the medium moving means circulates the medium in the second path and moves the medium in the first path. The heat exchanger according to item 1. A medium moving means for moving the medium in the second path, and a medium moving means for moving the medium in the first path, comprising two or more medium moving means for moving the medium; 2. The heat exchanger according to claim 1, wherein the heat exchanger comprises another medium moving means. At least a part of the medium that moves in the first path is taken into the second path, and the medium that has returned in the second path is returned to the first path in the first path. The heat exchanger according to claim 2 or 3, wherein the heat exchanger is moved. The heat exchanger according to claim 1, wherein a flow rate of the medium in the second path is higher than a flow rate of the medium in the first path. The heat exchanger according to claim 2, wherein a shield plate is provided along the second path. The heat exchanger according to claim 1, wherein the heat exchanger comprises a heat sink. The heat exchanger according to claim 1, wherein the heat exchanger comprises an air conditioner. The heat exchanger according to claim 1, wherein the heat exchanger comprises a refrigerator.

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