JP2002261217A - Boiling cooler and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boiling cooler whose rigidity is high as a whole, whose heat resistance is superior, in which cracks and refrigerant leakages due to the thermal stress or a pressure change are less likely to be generated and which is manufactured easily. SOLUTION: The boiling cooler is provided with a plurality of tank segments 10, which comprise through-formed refrigerant passages 14 used to house a liquid-phase refrigerant and which are connected to a heating element on the outside, a frame body 20 forming the outline of a flat space 20a which houses the liquid-phase refrigerant evaporated by the heat of the heating element and partition plates 30 which are composed of brazing sheets with the formed brazing material layers on both faces of a metal plate, which comprise openings 34 for the liquid-phase refrigerant, and communicating with the refrigerant passages 14 in the lower part and which are installed on both sides of the frame body 20. The tank segments 10 are brazed to and integrated with the lower parts of the partition plats 30, in a laminated state with the refrigerant passages 14 being made to communicate with the openings 34 for the liquid- phase refrigerant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a boiling cooler comprising a laminated structure and a method for manufacturing the same. This boiling cooler is suitable for cooling a relatively large heating element, for example, a main power control element (IGBT) of a railway vehicle, but the application is not limited to this.

[0002]

2. Description of the Related Art A liquid-phase refrigerant (also referred to as a working fluid) such as ethanol is boiled and evaporated by the heat of a heating element, and the gas-phase refrigerant is cooled, condensed and lowered using fins or the like, and circulated. A device that cools a heating element by using a heat pipe is known as a heat pipe (a gas-phase refrigerant storage chamber has a pipe shape) or a boiling cooler (a gas-phase refrigerant storage chamber has a shape other than a pipe). In this way, heat pipes or boiling coolers utilizing the two-phase change of the refrigerant do not require a forced refrigerant circulating device, and have a higher heat transport performance than fin coolers simply made of a metal plate. It has been widely used for cooling heating elements from small electronic devices to large power supply devices.

FIG. 11 shows an example of a boiling cooler in which a gas-phase refrigerant accommodating chamber and cooling fins are formed in a laminated structure. The boiling cooler 101 has a tank 103 which is attached to a heating element (not shown) located below and receives heat transfer from the heating element, and a flat gas-phase refrigerant accommodating chamber and cooling fins are alternately laminated. A condenser 102 is provided and arranged inside the tank 103 so as to be able to circulate fluid. The tank 103 is made of an extruded material and has a plurality of coolant accommodating grooves 1 for accommodating a liquid-phase coolant (for example, ethanol).
Reference numeral 06 is formed so as to extend in the longitudinal direction of the evaporative cooler 101. Both ends of these grooves are sealed
Is sealed by welding to the tank 103. The upper surface of the tank 103 includes a plurality of coolant accommodating grooves 1.
06, an opening for accommodating the capacitor 102 is formed. After being fitted into the opening, the capacitor 102 is fixed to the tank 103 by welding a fillet portion connected to the tank 103 over the entire circumference.

[0004]

Generally, the temperature of a heating element fluctuates. When the heating element is, for example, a main power control element of a railway car that is operated every day, a large temperature change from a completely cold state to a high temperature state occurs at least once a day,
In addition, a number of relatively small temperature changes occur during operation.
Such a change in temperature of the heating element is transmitted to the cooler, and a thermal stress cycle occurs in each part of the cooler, or a stress cycle occurs due to a change in vapor pressure of the refrigerant. In the boiling cooler 101 as described above, the tank 103 and the condenser 10
2, since the tank 103 and the sealing member 104 are welded together by the linear welding bead 105, these stresses are concentrated near the welding bead 105, and cracks are generated from metal fatigue due to repeated stress fluctuations. However, there is a problem that the refrigerant may leak. Further, the boiling cooler 101 is not suitable for high-pressure applications because the rigidity of the lower part of the condenser 102 to which the highest pressure is applied is low.

[0005] Further, in the above-mentioned boiling cooler 101, at the time of its manufacture, formation of the capacitor 102 by lamination / vacuum brazing, formation of the base material of the tank 103 by extrusion, formation of an opening on the upper surface of the tank 103, And various operations such as welding between the tank 103 and the sealing member 104 are required, and there is also a problem that the production takes a long time and the production cost increases accordingly. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of a conventional boiling cooler, and has as its object the purpose of having high overall rigidity, excellent pressure resistance, and thermal stress or pressure fluctuation. An object of the present invention is to provide a boiling cooler in which cracks and refrigerant leakage hardly occur and which is easy to manufacture. Another object of the present invention is to provide a method for manufacturing such a boiling cooler.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a boiling cooler provided by the present invention has a coolant passage formed therethrough for accommodating a liquid-phase coolant, and is provided with an external heating element. A plurality of tank segments to be connected, a frame body that forms the contour of a flat space that houses the liquid-phase refrigerant at the bottom and houses a gas-phase refrigerant evaporated by the heat of the heating element at the top,
A partition plate provided on both sides of the frame body, comprising a brazing sheet having a brazing material layer formed on both surfaces of a metal plate and having a liquid-phase refrigerant opening portion communicating with the refrigerant passage at a lower portion,
Wherein the tank segment is brazed and integrated below the partition plate in a laminated state in which the refrigerant passage and the liquid-phase refrigerant opening communicate with each other.

[0008] According to this structure, all the joints between the constituent members are surface joints, so that the overall rigidity is high, the pressure resistance is excellent, and the thermal stress or the stress accompanying the pressure fluctuation is suitably dispersed. Refrigerant leakage hardly occurs. The connection with the heating element is integrated into the overall structure through surface bonding,
Advantageously works to prevent cracks. Further, after each component is laminated, heating is performed only once in a vacuum, so that the brazing material is melted and integrated as a whole, so that production is extremely easy.

It is preferable that the tank segment has a plurality of the refrigerant passages and a communication groove for communicating the plurality of refrigerant passages with each other. Further, the upper end of the communication groove is disposed below a refrigerant liquid level that can be filled up to 40 to 90% of the maximum height of the refrigerant passage, and the vertical interval of the communication groove is the maximum height × 0. .13 or more. In this case, the upper part 1 to 6 of the refrigerant passage
The space is secured as a space for facilitating the flow of the steam to the condensing section.

[0010] The liquid level height of the liquid-phase refrigerant in each refrigerant passage may differ due to unevenness in the amount of heat transmitted from the heating element, inclination of the heating element, centrifugal force, and the like. ,
In the worst case, liquid drying may occur. However, with the above configuration, such a problem does not occur because the liquid-phase refrigerant flows through the communication groove and the liquid level height of the liquid-phase refrigerant in each refrigerant passage becomes uniform. In addition, as described above, it is preferable that the communication groove is provided below the liquid surface of the refrigerant because the movement of the liquid-phase refrigerant is easy. Function is not impaired.

It is more preferable that the frame is formed so as to hold an inner fin for promoting heat dissipation in the flat space.

According to this structure, the heat of the refrigerant is more easily transmitted to the partition plate and the outer fins, so that the cooling effect as the cooler is further improved.

[0013] The present invention provides a method of manufacturing a boiling cooler, comprising: a plurality of tank segments having a coolant passage formed therethrough for containing a liquid-phase coolant and including a connection portion to an external heating element; A brazing body in which a lower portion contains the liquid-phase refrigerant and an upper portion forms a contour of a flat space in which a gas-phase refrigerant evaporated by the heat of the heating element is stored, and a brazing material layer is formed on both surfaces of a metal plate Preparing a partition plate made of a sheet and having a liquid-phase refrigerant opening portion communicating with the refrigerant passage at a lower portion, and provided on both sides of the frame body; and the partition plate, the frame body, and the tank. And a step of assembling a laminate by stacking the segments with the refrigerant passage and the liquid-phase refrigerant opening communicating with each other, and integrating the laminate by heating and brazing. Features.

According to this manufacturing method, the brazing material is melted and integrated as a whole by heating once in a vacuum after laminating the constituent members, so that the overall rigidity is high and the pressure resistance is high. Thus, a boiling cooler that is less likely to cause cracks and refrigerant leakage can be manufactured very easily.

The partition plate, the frame and the tank segment have alignment holes at corresponding positions, respectively.
More preferably, the step of assembling the laminate includes the step of inserting an alignment pin into the alignment hole.

If the positioning pins are used, the positioning of the components becomes easy and accurate, and the positioning pins also serve as reinforcing members penetrating the entire cooler. is there.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the accompanying drawings showing a preferred embodiment of a boiling cooler according to the present invention.

First, referring to FIG. 1, FIG. 2, and FIG. 3, an overall configuration of an embodiment of a boiling cooler 1 according to the present invention will be described. FIG. 1 is a perspective view showing an embodiment of a boiling cooler 1 according to the present invention in a completed state, FIG. 2 is an exploded perspective view showing a part of the boiling cooler 1 disassembled into respective constituent members, and FIG. FIG. 3 is a plan view of the boiling cooler 1 in which the condenser portion 2 is removed and only the tank portion 3 is viewed from above (the inner fin 7 described later).
0 is omitted). The boiling cooler 1 of the present embodiment has a shape in which two rectangular parallelepipeds are piled up when viewed broadly. More specifically, the boiling cooler 1 includes a substantially rectangular parallelepiped condenser portion 2, a substantially rectangular parallelepiped tank portion 3 disposed below the condenser portion 2, and a front-rear direction indicated by a double-headed arrow A from the tank portion 3. And a substantially rectangular parallelepiped lateral overhanging portion 5 extending from the tank portion 3 in the left-right direction as shown by a double-headed arrow B.

The capacitor section 2 includes a plurality of partition plates 30, a combination of fins 40 and headers 50, a plurality of partition plates 30, a frame 20, and a plurality of partition plates 30 in this order in the front-rear direction indicated by the double-headed arrow A. It is configured by laminating and joining, and furthermore, an end plate 31 is joined to an end portion in the front-rear direction (however, this forming mode is described for convenience of explanation of the structure, The actual method of manufacturing the cooler 1 will be described in detail later. Thus, the capacitor section 2 includes a large number of flat spaces 20a and fins 40 formed by the frame body 20 and the two partition plates 30, 30 sandwiching the frame body 20. The fins 40 are sandwiched between the two partition plates 30, 30 in order to enhance the heat radiation effect. The upper end has a plurality of gas-phase refrigerant passages 55.
5 and a plurality of gas-phase refrigerant openings 35 of the partition plate 30
.. 35 and a plurality of flat spaces 20a... 20a form a plurality of passages through which the gas-phase refrigerant flows.

The tank section 3 includes a partition plate 30, a tank segment 10, a partition plate 30, a frame 20, a partition plate 30,
In this order, a large number of the refrigerant passages 14 of the tank segment 10 and the liquid-phase refrigerant openings 34 of the partition plate 30 communicate with each other so as to communicate with each other in the front-rear direction indicated by the double-headed arrow A. The end plate 31 is formed by joining the end plates 31 at the front and rear ends (however, this formation mode is also described for convenience of explanation of the configuration, and the boiling cooler 1
The actual manufacturing method will be described in detail later.)
In this manner, a plurality of liquid-phase refrigerant storage sections 3 that partially open upward to store the liquid-phase refrigerant are provided in the tank section 3.
3a are formed (FIG. 3). A heating element 80 (only shown in FIG. 4) is connected to the lower surface of the tank unit 3.

The front and rear overhangs 4 are end segments 11 and 2
And is mainly used for mounting the evaporative cooler 1. In the illustrated embodiment, the end segment 11 has a plurality of passages 11a.
11a, the corner segment 13 has a passage 13a formed by cutting the end segment 11 and the tank segment 10 from a common extruded base material, and forming the corner segment 13 and the side segment 12a. (Described later) are formed by cutting out from a common extruded base material, and these passages 11a and 13a are not for accommodating the refrigerant.
However, having these passages 11a... 11a, 13a is preferable from the viewpoint of weight reduction.

The side projecting portion 5 includes a partition plate 30, a side segment 12, a partition plate 30, a frame 20, and a partition plate 30.
Are laminated and joined in this order in the front-rear direction indicated by the double-headed arrow A, and an end plate 31 is joined to an end in the front-rear direction. Like the front and rear overhangs 4, the side overhangs 5 are mainly used for mounting the evaporative cooler 1.
In the embodiment shown, the lateral overhang 5 also has a through passage, but not for accommodating a coolant, the main purpose being to reduce the weight.

Next, the cooling operation of the boiling cooler 1 will be described. A typical liquid-phase refrigerant used here is ethanol, but other liquids have the same cooling function.

A suitable amount of liquid-phase refrigerant is injected into the completed evaporative cooler 1 from an injection port (not shown), and then sealed. In this state, the boiling cooler 1 has the tank 3
It is fixed so as to contact 0. When the temperature of the heating element 80 rises, the tank segment 10, the frame 20, the partition plate 3
0 is heated, the temperature of the refrigerant stored in the liquid-phase refrigerant storage units 3a... 3a rises, and boiling starts soon. The vapor evaporated from the boiling refrigerant rises and enters a large number of flat spaces 20a... 20a formed in the condenser 2 through a plurality of openings formed in the upper part of the tank 3. The vapor touches the partition plate 30 and the inner fin 70 suitably cooled by the fins 40, deprives of heat and condenses to become a liquid-phase refrigerant. Reflux to 3a. Liquid phase refrigerant storage section 3a
... The refrigerant returned to 3a boils and evaporates again and repeats the above process. Thus, the heat of the heating element 80 is suitably radiated to the outside of the evaporative cooler 1 through the phase change of the refrigerant.

In the illustrated embodiment having the header 50 having the gaseous-phase refrigerant passages 55... 55, a part of the vapor of the boiling refrigerant further rises and the vapor-phase refrigerant passages 55.
Flow into 5. Thus, the gas-phase refrigerant is supplied to the condenser 2
20a can freely flow through a plurality of passages formed at the upper end of the heating element 80, so that the temperature distribution of the heating element 80 is not uniform and a difference occurs in the vapor pressure in each of the flat spaces 20a. Even if possible, the vapor pressure is equalized.

Hereinafter, each component will be described in detail.

FIG. 4 is a front view showing details of the tank segment 10. The tank segment 10 is formed by cutting an extruded material of aluminum or an aluminum-based alloy in a direction perpendicular to the extrusion direction, and has a plurality (eight in the illustrated embodiment) of refrigerant passages 14.
4 and a plurality of alignment holes 16, 16 (2 in the illustrated form).
). When the boiling cooler 1 is completed, the refrigerant passages 14...
4... 24 and liquid-phase refrigerant openings 34.
And liquid-phase refrigerant storage portions 3a. The alignment holes 16, 16 have a function of coordinating with the alignment pins 60 (see FIG. 2) to accurately align the relative positions of the constituent members in the stacking stage. When the tank segment 10 is relatively small, a single refrigerant passage 14
May be used.

A plurality of tank segments 10 are used, and at least one of them has a plurality of refrigerant passages 1.
Communication grooves 15... 15 are formed to connect 4. The liquid level height of the liquid-phase refrigerant in each of the refrigerant passages 14.
When the amount of heat transmitted from the heating element 80 is not uniform,
When the heating element 80 is inclined in the left-right direction (that is, when the railway vehicle or the like holding the heating element 80 is inclined), or when a centrifugal force is applied, they may be different from each other. Drying can also occur. In such a case, the communication grooves 15.
The liquid phase refrigerant has a function of flowing the liquid refrigerant between the refrigerant passages 14 so as to equalize the liquid level of the liquid refrigerant in each of the refrigerant passages 14.

It is preferable that the liquid level position of the refrigerant is determined as follows. That is, the refrigerant is introduced into 40 to 90% of the maximum height H of the refrigerant passages 14..., And 10 to 60% of the maximum height H of the refrigerant passages 14. This secures a space in which the vapor of the refrigerant can move, so that the vapor easily rises to the condenser section 2 side even if the refrigerant boils in sequence, and the liquid-phase refrigerant is always ensured to prevent liquid depletion. For example, in the illustrated preferred embodiment, the liquid level position of the refrigerant is set to a position which is ／ of the maximum height H of the refrigerant passages 14.

The positions and sizes of the communication grooves 15 are preferably determined as follows. That is, the communication grooves 15 ...
The position of 15 is determined such that its upper end is disposed below the refrigerant liquid level, and its width (upper / lower interval W) is determined by the refrigerant passages 14.
It is preferable to set the maximum height of H.times. For example, in the illustrated preferred embodiment, the refrigerant passage 1
The maximum height H of 4 ... 14 is 50 mm, the liquid level of the refrigerant in the communication groove is 33 mm from the bottom of the refrigerant passages 14 ... 14, and the center C of the communication groove is 5 to 15 mm below the liquid level of the communication groove. Is set to 10 mm. In addition, the communication groove 15
.. 15 may be provided on both the front and rear surfaces of the tank segment 10 as shown in a cross section in FIG.

Further, at least one tank segment 10 has a connecting portion 10 a for connecting to the heating element 80.
.. 10a are provided. Connection 1 in the illustrated embodiment
Reference numeral 0a denotes a surplus portion 10b that has escaped the refrigerant passage 14 and a screw hole 10c, which are provided at six locations. The number of the connection portions 10a can be arbitrarily selected according to the size and shape of the heating element 80. In addition, surplus part 10
What is the shape of b, in other words, the refrigerant passage 1
The shape of the cross section of No. 4 can be arbitrarily selected. Since the tank segment 10 is formed from an extruded material, a complicated shape can be easily realized. In this manner, by providing the connection portions 10a to 10a in the tank segment 10, the heating element 80 (or the heating element 80) is provided.
Input from the tank segment 10 to other members via the surface joint by brazing, so that the endurance of the ebullient cooler 1 can be improved. This is advantageous from the viewpoint of sex.

FIG. 6 is a front view showing the details of the frame 20. The frame body 20 is made of aluminum or an aluminum-based alloy, and a plurality of coolant accommodating grooves 24.
It has. The coolant accommodating grooves 24 have a shape partially corresponding to the plurality of coolant passages 14 of the tank segment 10, and are open upward. When the refrigerant accommodating grooves 24 are stacked, they form the liquid-phase refrigerant accommodating portions 3a 3a together with the refrigerant passages 14 of the tank segment 10 and the liquid-phase refrigerant openings 34 of the partition plate 30. The upper part of the frame 20 forms the outline of the flat space 20a that stores the gas-phase refrigerant evaporated by the heat of the heating element 80, and the uppermost part is the header 50 and the gas-phase refrigerant passages 55 thereof in the present embodiment. It has a shape partially corresponding to 55. The outermost peripheral contour of the frame body 20 has a shape including all of the capacitor part 2, the tank part 3, and the side protrusion parts 5, 5 shown in FIG. Further, the frame 20 is provided with a plurality of (six in the illustrated embodiment) alignment holes 26. When the frame 20 is relatively small, the coolant accommodating groove 24 may be a single groove.

The frame body 20 shown in FIG. 6 has a plurality of fin holding portions 21... 21 and 21a... 2 so as to hold the inner fin 70 for promoting heat dissipation in the flat space 20a.
1a. According to this configuration, the inner fin 70 is held at a predetermined position during assembly, and when used as a cooler, the heat of the gas-phase refrigerant is more easily transmitted to the partition plate 30 and the fin 40, so that the inner fin 70 boils. Cooler 1
Cooling performance is further improved. Various fins such as an offset fin can be used as the inner fin 70.

In the present embodiment, the fin holding portions 21a at the upper ends of the coolant accommodating grooves 24 are formed with the refrigerant passages 14 of the tank segment 10 and the liquid-phase refrigerant opening 34 of the partition plate 30. 34 are arranged at a position slightly higher than the upper end position. This is because the inner fin 70 has the liquid-phase refrigerant storage portion 3
This is in order not to block a 3a.

FIG. 7 is a front view showing details of the partition plate 30. The partition plate 30 is a brazing sheet in which a brazing material layer is formed on both surfaces of a metal plate such as aluminum or an aluminum alloy (usually a brazing material layer formed by cladding).
Is formed from. When the boiling cooler 1 is made of aluminum, the brazing material is preferably an aluminum-silicon-based brazing material or an aluminum-silicon-magnesium-based brazing material, but is not limited thereto. The brazing material is melted and solidified by vacuum brazing, and the partition plate 30
Functions like an adhesive bonding the members.

The partition plate 30 has a plurality of liquid-phase refrigerant openings 34... 34 corresponding to the plurality of refrigerant passages 14. Shape. In addition, the partition plate 3
0 is a gas phase refrigerant passage 55.
Openings 3 for gas-phase refrigerant formed in a shape corresponding to
5 ... 35. When the partition plates 30 are stacked, they are combined with the frame body 20 to form a flat space 20a for accommodating a gas-phase refrigerant. The liquid-phase refrigerant openings 34.
The refrigerant passages 14... 14 of the tank segment 10 and the frame 2
And the liquid-phase refrigerant accommodating portions 3a along with the 0 refrigerant-accommodating grooves 24 ... 24.
3a. The outermost peripheral contour of the partition plate 30 has a shape including all of the capacitor part 2, the tank part 3, and the side protrusion parts 5, 5 shown in FIG. Further, a plurality of (six in the illustrated embodiment) alignment holes 36.
6 are provided. When the partition plate 30 is relatively small, the liquid-phase refrigerant opening 34 may be a single opening.

The partition plate 30 shown in FIG.
7. These are the fins 40 during the laminating operation.
, And then bent as shown in FIG.
0 is held at a predetermined position until fusion bonding is performed.

The fins 40 are preferably formed by bending a thin metal plate to have a large number of air passages, and are sandwiched between two partition plates 30 in the front-rear direction as shown in FIG. In the direction, it is arranged so as to be sandwiched between the tank segment 10 and the header 50. The thickness of the fin 40 in the front-rear direction depends on the tank segment 10 and the header 5.
0, so that the two partition plates 30, 30 are in close contact with each other in the stacked state, and the brazing material of the partition plates 30, 30 is melted to form two partition plates. To the plates 30, 30 so that the partition plate 3
It acts to efficiently remove heat from 0,30 and dissipate it. The fins 40 may be straight fins or wavy fins.

As shown in FIG. 2, the header 50 has a plurality (five in the illustrated embodiment) of gas-phase refrigerant passages 55... And two (2) alignment holes 56 and are formed to have the same thickness as the tank segment 10. The gas-phase refrigerant passages 55... 55 have a shape corresponding to the shape of the gas-phase refrigerant openings 35 formed in the partition plate 30.
The header 50 includes two partition plates 30 in a stacked state.
When the brazing material of the partition plate 30 is melted, it is joined to the two partition plates 30. Therefore, the header 50 not only allows the gas-phase refrigerant to flow freely, but also has the effect of increasing the overall rigidity of the boiling cooler 1.

Two end plates 31, 31 (see FIGS. 1 and 2)
Is formed from a plate material (not including brazing material) of aluminum or an aluminum-based alloy thicker than the partition plate 30, has the same outer contour as the partition plate 30, and has an alignment hole 31a. The end plates 31, 31 are joined to secure rigidity of both ends in the front-rear direction of the capacitor portion 2 in particular. Further, the two joining plates 32, 32 (see FIG. 2) are formed of a brazing sheet similarly to the partition plate 30, and include an end plate 31, an end segment 11, and a corner segment 13.
It is sandwiched for surface joining.

Next, a procedure for manufacturing the evaporative cooler 1 according to the method of the present invention will be described.

First, the tank segment 10, the end segment 11, the side segment 12, the corner segment 13, the frame 20, the partition plate 30, the end plate 31,
A required number of each of the joining plate 32, the fins 40, the header 50, and the inner fins 70 are prepared.

Next, the positioning pins 60 are inserted into the positioning holes 16, 26, 31a, 36, 56 formed in the respective constituent members.
Through the end segments 11 and 2 (see FIG. 2).
Combination with three corner segments 13, 13, joint plate 3
2, end plate 31, partition plate 30, combination of tank segment 10 and fin 40, two side segments 12, 12 and header 50, partition plate 30, combination of frame 20 and inner fin 70, partition plate 30, tank segment 10
, The combination of the fins 40, the two side segments 12, 12 and the header 50, the partition plate 30, the combination of the frame body 20 and the inner fin 70, the partition plate 30,... (Omitted), the partition plate 30, the end Plate 31, joining plate 32, end segment 11
And a combination of the two corner segments 13 and 13 are all superposed in this order to form a non-bonded laminated body 1a (FIG. 2 shows only a part thereof). Then, it is appropriately pressed and held in the front-rear direction indicated by the double arrow A.

Next, the non-bonded laminated body 1a fixed and held
Is stored in an electric heating furnace or the like, and the inside of the furnace is evacuated, and then the temperature is increased until the melting point of the brazing material of the partition plate 30 is exceeded. After holding at high temperature for a predetermined time, lower the furnace temperature,
With the temperature lowered sufficiently, the boiling cooler 1 is taken out of the furnace.

In the boiling cooler 1 after the above heat treatment, the brazing material of the partition plate 30 and the joining plate 32 is melted, and all the constituent members are integrated. As described above, when an aluminum-silicon-based brazing material or an aluminum-silicon-magnesium-based brazing material is used, a suitable temperature for melting the brazing material is about 650 ° C.
It is.

Next, some modifications of the present invention will be described.

The front and rear overhang portions 4 are mainly used for mounting the boiling cooler 1 in the above embodiment, but may be used for absorbing heat by contacting the heating element 80.
In this case, for example, the end plates 31 and the joining plate 32 are provided with openings similar to the liquid-phase refrigerant openings 34...
11a is communicated with the refrigerant storage portions 3a... 3a, and
The other end face of the front and rear overhang portion 4 is additionally joined with another joining plate 32 (surface joining is performed by vacuum brazing together with other members).
Seal. In this case, since the end segment 11 and the corner segment 13 are connected at the end face of the front and rear overhang portion 4,
There is also an effect that the rigidity is further increased. Therefore, even when the passages 11a... 11a are not communicated with the refrigerant accommodating portions 3a.

In the above-described embodiment, the side projecting portion 5 is mainly used for attaching the boiling cooler 1, but may be used for absorbing heat by contacting the heating element 80.
In this case, for example, the tank segment 10 and the side segment 12 are integrally formed without being divided, and the refrigerant passage 14 and the side segment 12
And the coolant accommodating groove 24 of the frame 20 and the passage 22 are communicated.

In a form in which one of the front and rear overhang portions 4 and the side overhang portions 5 is eliminated, or a form in which both are eliminated,
The basic operation and effect according to the present invention can be obtained. But,
The provision of the front and rear overhang portions 4 or the side overhang portions 5 is preferable because the degree of freedom in mounting the evaporative cooler 1 is increased.

In the illustrated embodiment, the frame body 20 holds the inner fin 70, but the inner fin 70 can be omitted. However, in this case, the cooling performance is slightly inferior.

Further, regardless of the presence or absence of the inner fin 70, the side walls 24a... 24a forming the coolant accommodating grooves 24.
The inner fin 70 may extend further upward.
However, the vertical width of the inner fin 70 becomes smaller when the fin exists.) This is preferable because the support rigidity of the partition plate 30 by the frame body 20 is increased, and the pressure resistance and the durability are further improved.

FIG. 8 shows a modified embodiment of the refrigerant passage of the tank segment 10. The outline of the refrigerant passage 14 ′ in this modified embodiment has a large number of ridges 14 a and concave grooves 14 b extending in the front-rear direction (extrusion direction of the extrusion base material) of the boiling cooler 1.
And is formed from By doing so, the refrigerant passage 1
The contour surface area of 4 'is increased, and the starting point of nucleate boiling is increased. Therefore, the vaporization of the liquid-phase refrigerant becomes more active, and the amount of heat taken out by the vaporization increases, so that the cooling performance as a cooler can be improved. In the illustrated embodiment, the concavo-convex shape is substantially rectangular, but this is merely an example, and may be a shape other than a rectangle such as a triangular shape or a curved shape such as a sine wave, and the size of each concavo-convex may be freely selected. can do. Although only the refrigerant passage 14 'of the tank segment 10 is shown here, the outlines of the refrigerant accommodating grooves 24 ... 24 of the frame 20 and the liquid-phase refrigerant openings 34 ... 34 of the partition plate 30 are similar. It may be formed to have an uneven shape.

In the illustrated embodiment, the shape of the lower portion of the coolant accommodating grooves 24... 24 of the frame body 20 is a shape corresponding to the coolant passages 14. If it is configured so as to be located above the bottom surface of the passages 14..., The frame 20 serves as a wall, and the coolant accommodating portions 3a. According to such a configuration, even when tilted in the front-rear direction or when subjected to the action of centrifugal force in the front-rear direction,
Since a certain amount of the liquid-phase refrigerant remains in each section, it is possible to prevent the liquid-phase refrigerant from being extremely biased in one direction, and thus to avoid the danger of liquid drying.

In the illustrated embodiment, the boiling cooler 1 is provided with the header 50. However, even if the boiling cooler 1 does not include the header 50, the basic operation and effect according to the present invention can be obtained. In this case, the gas phase refrigerant opening 3 in the partition plate 30
5 ... 35 are omitted, and the upper end of the fin 40 is
It is preferable to match with the upper end of.

FIG. 9 shows a tank segment 10 'provided with a communication groove 15' which is a modification of the communication groove 15 in FIG.
FIG. 10 shows a cross section taken along line XX in FIG. This communication groove 15 ′ is formed in the tank segment 10 ′.
The rib has a shape in which a part of the rib is cut off so as to penetrate in the thickness (front-back) direction. Since the tank segment 10 'is formed by cutting an extruded aluminum material, the communication groove 15' is formed.
Can be formed simultaneously with the extrusion of the base material. Therefore, complicated post-processing required in the case of the communication groove 15 is unnecessary, and the production of the boiling cooler becomes easier. If such a tank segment 10 ′ is used at, for example, two places at both ends of the tank portion 3, the same operation as the embodiment using the above-described tank segment 10 can be obtained.

In the above description, ethanol is mentioned as a typical example of the refrigerant used. However, the refrigerant can be appropriately selected according to the temperature of the heating element, the outside temperature of the use environment, and the like. As an example of another suitable refrigerant having no fear of ozone depletion, perfluorocarbon can be given.

[0057]

As described in detail above, according to the present invention, the overall rigidity is high, the pressure resistance is excellent, cracks and refrigerant leakage due to thermal stress or pressure fluctuation are unlikely to occur, and the production is easy. A boiling cooler is provided. Furthermore, according to the invention, such a boiling cooler can be produced very easily by vacuum brazing.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a boiling cooler according to the present invention in a completed state.

FIG. 2 is an exploded perspective view showing a part of the boiling cooler of FIG.

FIG. 3 is a plan view of the boiling cooler of FIG. 1 in which a condenser portion is removed and only a tank portion is viewed from above.

FIG. 4 is a front view showing a tank segment constituting the boiling cooler of FIG. 1;

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a front view of a frame forming an outline of a flat space of the boiling cooler of FIG. 1;

FIG. 7 is a front view of a partition plate forming a wall surface of a flat space of the boiling cooler of FIG. 1;

FIG. 8 is a front view showing a modified embodiment of the refrigerant passage in the tank segment.

FIG. 9 is a front view showing a tank segment provided with another type of communication groove.

FIG. 10 is a sectional view taken along line XX in FIG. 9;

FIG. 11 is a perspective view showing an example of a conventional boiling cooler in a completed state.

[Explanation of symbols]

1. Boiling cooler; 1a Non-joined laminated body (laminated body);
10, 10 ': tank segment; 10a: connecting portion;
14, 14 '... refrigerant passage; 15, 15' ... communication groove;
16, 26, 31a, 36, 56 ... alignment holes; 2
0: Frame body; 24: Refrigerant accommodating groove; 30: Partition plate;
4 ... opening for liquid-phase refrigerant (opening); 35 ... opening for gas-phase refrigerant; 40 ... fin; 50 ... header;
Gas phase refrigerant passage; 60: alignment pin; 70: inner fin; 80: heating element; C: center of communication groove;
... Maximum height of the refrigerant passage; W: Vertical spacing of the communication groove

Claims (6)

[Claims] 1. A plurality of tank segments each having a coolant passage formed therethrough for accommodating a liquid-phase refrigerant and connected to an external heating element, and a lower part for accommodating the liquid-phase refrigerant and an upper part of the heating element. A frame forming an outline of a flat space for accommodating a vapor-phase refrigerant evaporated by heat of the heat, and a brazing sheet having a brazing material layer formed on both surfaces of a metal plate, and an opening for a liquid-phase refrigerant communicating with the refrigerant passage. Having a lower part and provided on both sides of the frame body,
The boiling cooler is characterized in that the tank segment is integrated by brazing below the partition plate in a laminated state in which the refrigerant passage and the liquid-phase refrigerant opening communicate with each other. 2. The boiling cooler according to claim 1, wherein the tank segment includes a plurality of the refrigerant passages and has a communication groove for communicating the plurality of refrigerant passages with each other. 3. An upper end portion of the communication groove is disposed below a refrigerant liquid level set to a maximum height of the refrigerant passage × [0.4 to 0.9], and an upper and lower portion of the communication groove. 3. The boiling cooler according to claim 2, wherein the interval is equal to or more than the maximum height × 0.13. 4. The frame according to claim 1, wherein the frame is formed so as to hold an inner fin for promoting heat dissipation in the flat space. A boiling cooler as described. 5. A plurality of tank segments each having a refrigerant passage formed therethrough for containing a liquid-phase refrigerant and including a connection portion with an external heating element, and a lower part containing the liquid-phase refrigerant, A liquid-phase refrigerant comprising a frame forming a contour of a flat space accommodating a vapor-phase refrigerant evaporated by the heat of the heating element, and a brazing sheet having a brazing material layer formed on both surfaces of a metal plate and communicating with the refrigerant passage. Preparing a partition plate having an opening portion at a lower portion and provided on both sides of the frame body, and separating the partition plate, the frame body and the tank segment with the refrigerant passage and the liquid-phase refrigerant. A method for manufacturing a boiling cooler, comprising: a step of assembling a laminated body by laminating the laminated body in a state in which the laminated body is communicated with the opening; and a step of integrating the laminated body by heating brazing. 6. The partition plate, the frame, and the tank segment each have an alignment hole at a corresponding position, and in the step of assembling the laminate, an alignment pin is inserted into the alignment hole. The method according to claim 5, comprising a step.