JP2004108673A - Cooling system of heat generation body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently cool a second heat generation body when heat generation amount of a first heat generation body is reduced while suppressing increase in manufacturing cost of a cooling system. <P>SOLUTION: Heat medium cooled by outside air in an outdoor heat exchanger 8 is circulated in an auxiliary cooling device 17 to assist cooling of the second heat generation body 3 when performing normal operation. When an abnormality occurs in a refrigerator 4, valves 14b, 14d are operated, and heat medium heated in a first heat collection device 2a is directly led into the outdoor heat exchanger 8 through a bypass circuit 16 to cool the first heat generation body 2. Consequently, even if heat generation amount of the first heat generation body 2 is reduced and refrigeration capacity generated in the refrigerator 4 is reduced, it is possible to cool the second heat generation body 3 without providing a new cooling means and exposing the second heat generation body 3 to outside air containing much dust directly. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cooling system that cools a plurality of heating elements in a system having a plurality of heating elements, and is used for cooling electronic devices, electric devices, electric converters, batteries, and the like in a mobile phone base station. It is valid.
[0002]
[Prior art]
In a conventional heating element cooling system, heat is absorbed from a first heating element, and the second heating element is cooled by an adsorption refrigerator operated by the absorbed heat (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-100891
[Problems to be solved by the invention]
However, when the calorific value of the first heating element decreases, the refrigerating capacity generated in the adsorption refrigerator decreases. Therefore, in the above invention, when the calorific value of the first heating element decreases, the second heating element is sufficiently cooled. May not be possible.
[0005]
For this purpose, for example, means for directly cooling the second heating element with the outside air by introducing the outside air can be considered, but generally, the heating element such as an electronic device or an electric device has low dust resistance. Therefore, it is not necessary to directly expose electronic devices and electric devices to the outside air containing a large amount of dust.
[0006]
However, if a dedicated cooling means is separately provided in preparation for a decrease in the amount of heat generated by the first heating element, the manufacturing cost of the cooling system will increase.
[0007]
Further, in the case where there is a third heating element having a different heat resistance temperature from the first and second heating elements, if a cooling means only for cooling the third heating element is separately provided, the manufacturing cost of the cooling system will increase. .
[0008]
In view of the above, the present invention provides, firstly, a new cooling system different from the conventional one, and secondly, the heat generation amount of the first heating element is reduced while suppressing an increase in the manufacturing cost of the cooling system. The third object is to sufficiently cool the second heating element when performing the cooling operation, and thirdly, to cool the third heating element while suppressing an increase in the manufacturing cost of the cooling system.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, heat is absorbed from the first heating element (2) and the second cooling means (4) is operated by the absorbed heat. A heating element having a second cooling means (8, 14b, 14d, 16) for cooling the first heating element (2) when the first cooling means (4) fails while cooling the body (3). In the cooling system, when the first cooling means (4) is operating normally, the second heating element (3) can be cooled by the second cooling means (8, 14b, 14d, 16). It is characterized by comprising.
[0010]
Accordingly, a large amount of dust can be generated without providing a new cooling unit, even when the heat generation amount of the first heating element (2) is reduced and the refrigerating capacity generated in the first cooling unit (4) is reduced. The second heat generating element (3) can be cooled without directly exposing the second heat generating element (3) to the outside air included in (1).
[0011]
According to the second aspect of the present invention, a cooling system for a heating element that absorbs heat from the first heating element (2) and cools the second heating element (3) by the first cooling means (4) operated by the absorbed heat. , A second cooling means (8, 14b, 14d, 16) for cooling the third heating element (19), and when the first cooling means (4) fails, the first heating element (2) is removed. It is characterized by cooling by the second cooling means (8, 14b, 14d, 16).
[0012]
Thereby, the third heating element (19) can be cooled without providing a new cooling means while increasing the reliability of the cooling system.
[0013]
According to the third aspect of the present invention, the second cooling means (8, 14b, 14d, 16) transfers the absorbed heat to the outside of the space in which the first and second heating elements (2, 3) are housed via the heat medium. Characterized in that it is released to the public.
[0014]
In the invention described in claim 4, the first cooling means (4) has an adsorbent that adsorbs the evaporated gas-phase refrigerant and desorbs the adsorbed refrigerant when heated. And an adsorber (5) filled with an adsorbent is housed in a space.
[0015]
Incidentally, the reference numerals in parentheses of the respective means are examples showing the correspondence with specific means described in the embodiments described later.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
In the present embodiment, the cooling system according to the present invention is applied to cooling of an electronic device in a mobile phone base station (hereinafter, abbreviated as a base station) 1.
[0017]
In the base station 1, a first heating element 2 including a radio wave output amplifier, a radio wave output control panel, a rectifier, an electronic device, an electric device, an electric converter, and the like, which generates a relatively large amount of heat and has a high temperature; A second heating element 3 including a circuit control panel, a battery, an electronic device, an electric device, an electric converter, a modem, and the like that need to be cooled at a lower temperature than the first heating element 2, and a refrigeration unit that cools both the heating elements 2, 3 Machine 4 (portion surrounded by a dashed line). The two heating elements 2 and 3 do not operate independently, but both operate in conjunction with each other.
[0018]
Here, the refrigerator 4 serving as the first cooling means is an adsorption refrigerator which operates by absorbing heat from the first heating element 2 and heating the adsorbent by the absorbed heat. (Refrigerator 4) will be described.
[0019]
The adsorbent adsorbs the refrigerant (in the present embodiment, water) and desorbs the adsorbed refrigerant by being heated. In the present embodiment, the adsorbent is a solid adsorbent such as silica gel or zeolite. Is adopted.
[0020]
The adsorber 5 is a container in which a refrigerant is sealed in a state where the inside of the adsorber is kept substantially in a vacuum. The adsorber 5 includes a first heat exchanger 6 for exchanging heat between the adsorbent and the heat medium. And a second heat exchanger 7 for exchanging heat between the heat medium and the refrigerant sealed in the adsorber 5.
[0021]
Incidentally, in the present embodiment, water mixed with an ethylene glycol-based antifreeze is employed as the heat medium.
[0022]
The refrigerator 4 according to the present embodiment includes a plurality of adsorbers 5a and 5b, and a right adsorber 5a (hereinafter, referred to as a first adsorber 5a) and a left adsorber on the paper. 5b (hereinafter, referred to as a second adsorber 5b) has the same configuration. Therefore, when both are collectively referred to, they are referred to as an adsorber 5.
[0023]
The subscripts a of the heat exchangers 6 and 7 indicate that they are heat exchangers in the first adsorber 5a, and b indicates that they are heat exchangers in the second adsorber 5b. The adsorber 5a is hereinafter referred to as a first adsorber 5a, and the adsorber 5b on the left side of the drawing is hereinafter referred to as a second adsorber 5b.
[0024]
The outdoor heat exchanger 8 is provided outside the building of the mobile phone base station 1 to exchange heat between a heat medium and outdoor air (a heat radiation target). The outdoor heat exchanger 8 includes a radiator 8a and a cooling device. The first radiator 8a is provided upstream of the second radiator 8b with respect to the flow of cooling air.
[0025]
The first heat collector 2a collects heat generated in the first heating element 2 and exchanges the collected heat with a heat medium. The second heat collector, that is, the cooler 3a is a refrigerator 4a. The heat exchanger cools the cooling air by exchanging heat with the cooling medium blown to the second heating element 3.
[0026]
The valves 9a to 9e are rotary valves for switching the heat medium flow, and the pumps 10a to 10d circulate the heat medium.
[0027]
When the refrigerator 4 fails, the bypass circuit 16 directs the heat medium heated by the first heat collector 2a to the outdoor heat exchanger 8 by bypassing the valves 9a to 9d and directly to the outdoor heat exchanger 8. The valves 14b and 14d are three-way valves for switching between a case where the heat medium is circulated in the bypass circuit 16 and a case where the heat medium is not circulated, and the reserve tank 15 supplies the heat medium amount in the cooling system or supplies the surplus heat medium. This is a heat medium tank for storing heat.
[0028]
The auxiliary cooler 17 is a heat exchanger connected to the bypass circuit 16 via the medium circuit 17a. In the present embodiment, the auxiliary heat exchanger 17 is operated by the outdoor heat exchanger 8 when the refrigerator 4 is operating normally without any failure. The heat medium cooled by the outside air is guided to the auxiliary cooler 17 to assist the cooling of the second heating element 3.
[0029]
Specifically, as shown in FIG. 2, a cooler 3 a is arranged below the second heating element 3, an auxiliary cooler 17 and a blower 18 are arranged above the second heating element 3, and (2) The high-temperature air immediately after passing through the heating element 3 is cooled by the auxiliary cooling device 17, and the air cooled by the auxiliary cooling device 17 is further cooled by the cooling device 3 a and supplied to the second heating element 3. Thereby, the cooling of the second heating element 3 is assisted.
[0030]
In the present embodiment, the cooler 3a, the auxiliary cooler 17, and the rack 3b constituting a wall member that covers the second heating element 3 prevent the cooling air from flowing around the second heating element 3. Thus, the second heating element 3 is surely cooled.
[0031]
Next, the characteristic operation of the cooling system according to the present embodiment and the effects thereof will be described.
[0032]
Note that the basic operation of the cooling system according to the present embodiment is the same as that of the invention described in JP-A-2002-100891, and the description of the basic operation will be omitted.
[0033]
1. During normal operation, the heat medium cooled by the outside air in the outdoor heat exchanger 8 is circulated to the auxiliary cooler 17 to assist the cooling of the second heating element 3.
[0034]
Accordingly, even if the amount of heat generated by the first heating element 2 is reduced and the refrigerating capacity generated in the refrigerator 4 is reduced without providing a new cooling means, the first heating element 2 is not allowed to be exposed to the outside air containing a large amount of dust. The second heating element 3 can be cooled without directly exposing the second heating element 3.
[0035]
2. When an abnormality occurs in the refrigerator 4 and an abnormality occurs in the valves 9a to 9e due to some reason, for example, an abnormality occurs in the refrigerator 4, the valves 14b and 14d are operated to operate the first heat collector 2a. The heat medium heated by the heater is guided directly to the outdoor heat exchanger 8 via the bypass circuit 16 to cool the first heating element 2.
[0036]
As is apparent from the description of the operation, in the present embodiment, the bypass circuit 16, the outdoor heat exchanger 8, and the valves 14b and 14d constitute the second cooling means described in the claims. .
[0037]
By the way, when a malfunction occurs in the equipment in the cooling system, the communication system such as a telephone line is configured to automatically inform the management company or the like managing the cooling system that the malfunction has occurred. When a malfunction occurs, a service person repairs the cooling system in which the malfunction has occurred.
[0038]
This allows the first heating element 2 to be cooled when a malfunction occurs in the refrigerator 4, thereby improving the reliability of the cooling system.
[0039]
In this embodiment, when an abnormality has occurred in the refrigerator 4, the heat medium is circulated only between the first heat collector 2a and the outdoor heat exchanger 8, but the first heat collector 2a and the auxiliary heat medium are circulated. Needless to say, the heat medium may be circulated between the cooler 17 and the outdoor heat exchanger 8.
[0040]
(2nd Embodiment)
In the first embodiment, the cooling of the second heating element 3 is assisted by the bypass circuit 16 and the outdoor heat exchanger 8 forming the second cooling means. However, in the present embodiment, as shown in FIG. During normal operation, the third heating element 19 is cooled by the second cooling means including the bypass circuit 16 and the outdoor heat exchanger 8 and the like, and when an abnormality occurs in the refrigerator 4, it is heated by the first heat collector 2 a. The heated heat medium is led directly to the outdoor heat exchanger 8 via the bypass circuit 16 to cool the first heat generating element 2.
[0041]
The third heating element 19 has a higher heat-resistant temperature than the second heating element 3 and generates less heat than the first heating element 2. Specifically, the first heating element 2 is a power transistor or the like. The third heating element 19 is an electronic device having a lower heat-resistant temperature than a power transistor such as a DC-DC converter or an electrolytic capacitor.
[0042]
Incidentally, FIG. 4 is a view showing a heat collector for the first heating element 2 and the third heating element 19, and the heat collecting block 20 made of a metal having a high thermal conductivity such as aluminum or copper includes the first heating element. A passage through which the heat medium circulates while being pressed against the first and third heating elements 2 and 19 via a heat conductive grease such as silicon grease for quickly transmitting the heat generated by the second and third heating elements 19. Are formed inside.
[0043]
Further, between the portion of the heat collecting block 20 to which the first heating element 2 is pressed and the portion of the heat collecting block 20 to which the third heating element 19 is pressed, a groove 20a and a hole which form a gap for reducing the heat conduction sectional area. 20b are provided.
[0044]
In addition, as shown in FIG. 5, also in the present embodiment, the rack 3b is provided to prevent the cooling air from flowing around the second heating element 3.
[0045]
Therefore, in the present embodiment, the third heating element 19 can be cooled without providing a new cooling unit while improving the reliability of the cooling system.
[0046]
In this embodiment, when an abnormality has occurred in the refrigerator 4, the heat medium is circulated only between the first heat collector 2a and the outdoor heat exchanger 8, but the first heat collector 2a and the It goes without saying that the heat medium may be circulated between the three heating elements 19 and the outdoor heat exchanger 8.
[0047]
(Third embodiment)
In the above-described embodiment, the refrigerator 4 and the heating elements 2, 3 and the like are arranged in different spaces. However, in the present embodiment, the refrigerator 4 (the outdoor heat exchanger) as shown in FIGS. 8 is excluded) and the heating elements 2, 3 and the like are arranged in the same space, that is, in the base station.
[0048]
Thus, the piping for the heat medium can be shortened, so that the cooling capacity can be improved and the manufacturing cost can be reduced by reducing the heat loss.
[0049]
FIG. 6 shows an example in which the present embodiment is implemented with respect to the first embodiment, and FIG. 7 shows an example in which the present embodiment is implemented with respect to the second embodiment.
[0050]
(Other embodiments)
In the above-described embodiment, the blower 18 is arranged on the upper side, but the present invention is not limited to this. For example, the blower 18 may be arranged on the lower side.
[0051]
Further, although the rack 3b is provided in the above-described embodiment, the present invention is not limited to this, and the rack 3b may be omitted.
[0052]
Further, in the above-described embodiment, an adsorption type (absorption type) refrigerator is used as the refrigerator 4, but the present invention is not limited to this. For example, superheated steam is generated by waste heat, and the superheated steam is generated. A refrigerator that evaporates a refrigerant by operating an ejector pump with steam may be used.
[0053]
Further, the heat medium is not limited only to those shown in the above-described embodiment, for example, natural refrigerants such as water and ammonia, fluorocarbon-based refrigerants such as Fluorinert, chlorofluorocarbon-based refrigerants such as HCFC123 and HFC134a, Alcohol-based refrigerants such as methanol and ethanol, and ketone-based refrigerants such as acetone are conceivable.
[0054]
Further, in the above-described embodiment, the present invention has been described by taking the mobile phone base station as an example. However, the present invention is not limited to this, and the space such as a building, a basement, a factory, a warehouse, a house, a garage, and a vehicle is used. It can be applied to cooling of a plurality of types of heating elements (for example, a gas turbine engine, a gas engine, a diesel engine, a gasoline engine, a fuel cell, an electronic device, an electric device, an electric converter, a storage battery, and the like) disposed therein. it can.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a cooling system according to a first embodiment of the present invention.
FIG. 2 is an enlarged view of the cooling system according to the first embodiment of the present invention.
FIG. 3 is a schematic diagram of a cooling system according to a second embodiment of the present invention.
FIG. 4 is a two side view of a heat collector according to a second embodiment of the present invention.
FIG. 5 is an enlarged view of a cooling system according to a second embodiment of the present invention.
FIG. 6 is an enlarged view of a cooling system according to another embodiment of the present invention.
FIG. 7 is an enlarged view of a cooling system according to another embodiment of the present invention.
[Explanation of symbols]
1 ... mobile phone base station, 2 ... first heating element, 3 ... second heating element,
4 ... Adsorption refrigerator, 5 ... Adsorber, 8 ... Outdoor heat exchanger,
16: bypass circuit, 17: auxiliary cooler.

Claims (4)

When the first cooling means (4) absorbs heat from the first heating element (2) and cools the second heating element (3) by the first cooling means (4) operated by the absorbed heat, and the first cooling means (4) breaks down. A heating element cooling system having second cooling means (8, 14b, 14d, 16) for cooling the first heating element (2);
When the first cooling means (4) is operating normally, the second cooling means (8, 14b, 14d, 16) can cool the second heating element (3). A cooling system for a heating element, which is characterized in that: In a heating element cooling system in which heat is absorbed from the first heating element (2) and the second heating element (3) is cooled by first cooling means (4) operated by the absorbed heat,
A second cooling unit (8, 14b, 14d, 16) for cooling the third heating element (19);
When the first cooling means (4) fails, the first heating element (2) is cooled by the second cooling means (8, 14b, 14d, 16). system. The second cooling means (8, 14b, 14d, 16) discharges the absorbed heat to a space outside the first and second heating elements (2, 3) through a heat medium. The heating element cooling system according to claim 1. The first cooling means (4) is an adsorption refrigerator including an adsorbent that adsorbs the evaporated gas-phase refrigerant and desorbs the adsorbed refrigerant when heated. ,
The cooling system for a heating element according to claim 3, wherein the adsorber (5) in which the adsorbent is sealed is housed in the space.

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