JP2005069571A - Laminate type heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminate type heat exchanger capable of reducing flowing resistance while securing corrosion resistance in a fluid passage. <P>SOLUTION: In this laminate type heat exchanger, a first planar member 121 having a first opening 121a, and a second planar member 122 having a second opening 122a are mixedly laminated, and the first opening 121a, and the second opening 122a are communicated with each other, so as to form a fluid passage 120A flowing the fluid. At least one respective face of the first and second planar members 121, 122 is provided with a sacrifice material. The second opening 122a has an opening shape approximately equal to that of the first opening 121a, and is formed at a displaced position. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a laminated heat exchanger suitable for application to a boiling cooler that cools a heating element such as a semiconductor element by boiling heat transfer of a refrigerant.

  As a conventional stacked heat exchanger, as shown in Patent Document 1, a plurality of metal plates having passage holes are stacked, and a continuous fluid passage is formed by the passage holes in the stacking direction. .

  Here, when the passage wall of the fluid passage is exposed to a corrosive environment, a protrusion is provided by projecting a part of the plurality of metal plates from the passage wall into the fluid passage. The part is designed to be lower in potential than other parts.

Thereby, in the passage wall of a fluid passage, pitting corrosion advances only to a projection part, and corrosion prevention of the passage wall of other fluid passages is enabled.
JP-A-8-5279

  However, since the cross-sectional area of the fluid passage is reduced by the protrusion provided in the fluid passage, there is a problem that the flow resistance is increased accordingly. Note that when the flow resistance increases, the flow rate of the internal fluid decreases, and the heat exchange performance as a stacked heat exchanger decreases.

  In view of the above problems, an object of the present invention is to provide a stacked heat exchanger that can reduce flow resistance while ensuring corrosion resistance in a fluid flow path.

  In order to achieve the above object, the present invention employs the following technical means.

  In the first aspect of the invention, the first plate member (121) having the first opening (121a) and the second plate member (122) having the second opening (122a) are mixed and laminated. In the stacked heat exchanger in which the first opening (121a) and the second opening (122a) communicate with each other to form a fluid channel (120A) through which the fluid flows, the first and second plate-like members are formed. At least one surface of each of (121, 122) is provided with a sacrificial material, and the second opening (122a) has substantially the same opening shape with respect to the first opening (121a) and is displaced. It is characterized by being formed in a different position.

  As a result, the end of the second opening (122a) of the second plate member (122) is located between the projection (122e) protruding into the fluid flow channel (120A) and the first plate member (121). The recessed part (122f) to enter will be formed. And the edge part of the 1st opening part (121a) corresponding to this recessed part (122f) will form the protrusion part (121e) which protrudes relatively in a fluid flow path (120A), and a fluid flow path ( When 120A) is exposed to a corrosive environment by a fluid, the sacrificial material in the protrusions (122e) and the protrusions (121e) is preferentially corroded, and the corrosion resistance of the fluid flow path (120A) can be improved.

  Here, when the convex part (122e) is formed, the concave part (122f) is also formed at the same time, and this concave part (122f) can increase the flow path cross-sectional area of the fluid flow path (120A), so that the flow resistance is reduced. Can be reduced.

  In addition, since the surface area in the fluid flow path (120A) can be increased by the incidental convex part (122e) and the concave part (122f), the heat exchange performance as the stacked heat exchanger (100) is improved. be able to.

  In the invention according to claim 2, the fluid flows in the direction in which the surfaces of the first and second plate-like members (121, 122) expand in the fluid flow path (120A) and the second opening (122a). It is characterized by flowing in a direction that intersects with the direction of deviation.

  As a result, the flow resistance can be reduced regardless of the amount of displacement of the position of the second opening (122a).

  Moreover, in invention of Claim 3, while forming in one side of the lamination direction of a 1st, 2nd plate-shaped member (121,122) by several plate-shaped members (111-113), inside, A refrigerant tank (110) in which the refrigerant is stored and the heating element (10) is attached to the outer surface is provided, and the third opening (121d) and the second provided in the first plate-like member (121) are provided. The fourth opening (122d) provided in the plate member (122) communicates with each other to form the refrigerant channel (120B), and the refrigerant channel (120B) communicates with the refrigerant tank (110). It is characterized by that.

  Thus, the present stacked heat exchanger (100) is a boiling cooler that guides the refrigerant boiled by the heating element (10) to the refrigerant flow path (120B) and exchanges heat with the fluid in the fluid flow path (120A). (100).

  According to a fourth aspect of the present invention, the fourth opening (122d) has substantially the same opening shape as the third opening (121d) and is formed at a shifted position.

  Thereby, the surface area in a refrigerant flow path (120B) can be increased, and the heat exchange performance with the fluid flow path (120A) side can be improved.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment description mentioned later.

(First embodiment)
Next, 1st Embodiment of the laminated heat exchanger of this invention is described based on FIGS. In the present embodiment, the laminated heat exchanger is applied to the boiling cooler 100. In the boiling cooler 100, for example, the refrigerant enclosed inside is boiled by heat of the heating element 10 such as a semiconductor element (IGBT), and the vaporized refrigerant is cooled by cooling water (corresponding to the fluid of the present invention) supplied from the outside. It is a heat exchanger that cools the heating element 10 by releasing the latent heat of condensation to cooling water when condensing into liquid.

  1 is a front view of the boiling cooler 100, FIG. 2 is a plan view of the boiling cooler 100, FIGS. 3 and 4 are plan views of the plates 111 to 113, 121, and 122, and FIG. FIG. 6 is a partial cross-sectional view taken along the line AA in FIG. 2, and FIG. 6 is a plan view of each of the plates 131-133.

  As shown in FIG. 1 and FIG. 2, the boiling cooler 100 is configured by laminating plates 111 to 113, 121, 122, and 131 to 133 in order from the lower side to the upper side, the refrigerant tank unit 110, and the heat exchange unit. 120, a refrigerant diffusion part 130 is formed. An inlet pipe 140, an outlet pipe 150, and a refrigerant sealing pipe 160 are provided on the upper surface (upper plate 133) of the refrigerant diffusion portion 130. Each of the above members is made of aluminum or aluminum alloy having excellent heat conductivity, and the boiling cooler 100 is formed by brazing these members together.

  The refrigerant tank portion 110 is a portion in which the refrigerant is stored, and includes a lower plate 111 and intermediate plates 112 and 113 as shown in FIG. Each plate (corresponding to a plurality of plate-like members of the present invention) 111 to 113 has a rectangular shape, and the intermediate plate 112 leaves a predetermined region on the end in the vertical direction in FIG. A plurality of refrigerant openings 112a extending in the left-right direction are provided, and the intermediate plate 113 is provided with a plurality of refrigerant openings 113a extending in the vertical direction leaving a predetermined region similar to the above in FIG. Yes. Refrigerant openings 112a and 113a communicate with each other at crossing portions to form a space for storing the refrigerant. In FIG. 1, the intermediate plates 112 and 113 are shown as being arranged one by one. However, the present invention is not limited to this, and a plurality of sets of intermediate plates 112 and 113 may be used depending on the amount of refrigerant stored.

  And the heat generating body 10 is arrange | positioned at the lower surface (lower plate 111) of the refrigerant tank part 110 (FIG. 1, FIG. 2), and is being fixed by clamping | tightening the volt | bolt etc. which are not shown in figure. In order to reduce the contact thermal resistance between the heating element 10 and the refrigerant tank 110, a thermal grease may be interposed therebetween.

  The heat exchanging part 120 is a characteristic part of the present invention. As shown in FIGS. 1, 4, and 5, the intermediate plate (corresponding to the first plate member of the present invention) 121 and the intermediate plate (the present invention). (Corresponding to the second plate-like member) 122) are laminated so as to coexist. Specifically, the intermediate plates 121 and the intermediate plates 122 are alternately stacked here.

  A sacrificial material (not shown) is provided on at least one surface of the intermediate plates 121 and 122. As is well known, the sacrificial material acts as an anode of the metal electrode with respect to the intermediate plates 121 and 122, and is consumed (sacrificial corrosion) by an electrochemical reaction, so that the corrosion resistance life of the counterpart intermediate plates 121 and 122 is increased. It is to extend. The sacrificial material is an aluminum material containing a predetermined amount of zinc so that the potential is lower than that of the aluminum material forming the intermediate plates 121 and 122.

  As shown in FIG. 4, the intermediate plates 121 and 122 each have a rectangular shape having the same outer shape as each of the plates 111 to 113 of the refrigerant tank 110, and each includes a plurality of refrigerant openings 121 d and 122 d and cooling water. Openings 121A and 122A are provided.

  As shown in FIG. 4A, the refrigerant opening (corresponding to the third opening of the present invention) 121d of the intermediate plate 121 is the same as the refrigerant opening 113a provided in the intermediate plate 113. It is provided with the size.

  The cooling water opening 121A includes an intermediate opening 121a that extends in the vertical direction in FIG. 4A, and an inlet-side opening 121b and an outlet-side opening that extend in the horizontal direction in FIG. 121c. The intermediate opening (corresponding to the first opening of the present invention) 121a is disposed so as to be sandwiched between the refrigerant openings 121d in the left-right direction in FIG. Further, portions corresponding to the comb teeth of the inlet side opening 121b and the outlet side opening 121c correspond to the position of the intermediate opening 121a.

  On the other hand, as shown in FIG. 4B, the refrigerant opening 122d and the cooling water opening 122A (the intermediate opening 122a, the inlet side opening 122b, and the outlet side opening 122c) of the intermediate plate 122 It is formed similarly to those of 121.

  However, as a characteristic part of the present invention, the refrigerant opening (corresponding to the fourth opening of the present invention) 122d and the intermediate opening (corresponding to the second opening of the present invention) 122a are the refrigerant opening 121d, intermediate The opening 121a is provided at a position shifted in the left-right direction in FIG. 4B within a range communicating with the stacking direction. Here, specifically, the refrigerant opening 122d and the intermediate opening 122a are shifted to the left side with respect to the positions assuming the refrigerant opening 121d and the intermediate opening 121a indicated by a two-dot chain line in FIG. 4B. Is set.

  The lengths of the portions corresponding to the comb teeth of the inlet-side openings 121b and 122b and the outlet-side openings 121c and 122c are different from each other, and when the intermediate plates 121 and 122 are stacked, the cooling water openings The entire parts 121A and 122A communicate with each other.

  In the heat exchange section 120, as shown in FIG. 5, the intermediate openings 121a and 122a communicate with each other in the stacking direction, thereby forming a cooling water flow path (corresponding to the fluid flow path of the present invention) 120A. Here, since the intermediate opening 122a is provided at a position shifted to the left in FIG. 5 with respect to the intermediate opening 121a, a convex part 122e protruding into the cooling water flow path 120A by the end of the intermediate opening 122a. And the recessed part 122f which penetrates between the intermediate plates 121 is formed. And the protrusion part 121e which protrudes relatively in the cooling water flow path 120A is formed by the edge part of the refrigerant | coolant opening part 121a corresponding to this recessed part 122f.

  In addition, the refrigerant passages 120B are formed by the refrigerant openings 121d and 122d communicating in the stacking direction. Also in this refrigerant flow path 120B, since the refrigerant opening 122d is provided at a position shifted from the refrigerant opening 121d, the convex part 122e, the concave part 122f, and the protruding part are provided in the same manner as the cooling water flow path 120A. 121e is formed. Note that the refrigerant flow path 120B communicates with the internal spaces of the refrigerant tank part 110 and a refrigerant diffusion part 130 described later.

  As with the refrigerant tank portion 110, the refrigerant diffusion portion 130 is formed by laminating a plurality of plates 131 to 133 as shown in FIGS. That is, the intermediate plate 131 and the intermediate plate 132 are alternately stacked, and the upper plate 133 is further disposed on the upper side.

  The intermediate plates 131 and 132 have a rectangular shape having the same outer shape as the plates 111 to 113 of the refrigerant layer portion 110. Similarly to the intermediate plates 112 and 113 of the refrigerant tank 110, the intermediate plates 131 and 132 are provided with a plurality of refrigerant openings 131a and 132a extending in the vertical direction or the horizontal direction in FIG. And the refrigerant | coolant opening part 131a is provided so that it may become the same position as the refrigerant | coolant opening part 122d of the heat exchange part 120, and the same magnitude | size.

  Further, the intermediate plates 131 and 132 and the upper plate 133 are provided with an inlet pipe hole 130a at the lower left in FIG. 6 and an outlet pipe hole 130b at the upper right, respectively. The inlet side opening portions 121b and 122b communicate with each other, and the outlet pipe hole 130b communicates with the outlet side opening portions 121c and 122c of the intermediate plates 121 and 122. An inlet pipe 140 and an outlet pipe 150 are joined to the pipe holes 130a and 130b of the upper plate 133 as shown in FIGS.

  Also, a refrigerant pipe hole 133a communicating with the refrigerant opening 132a is provided on the upper right side of the upper plate 133 in FIG. 6C. As shown in FIGS. 1 and 2, a refrigerant pipe 160 is joined to the refrigerant pipe hole 133a.

  In the refrigerant diffusion part 130, the refrigerant openings 131 a and 132 a communicate with each other at an intersecting portion to form an internal space, and the internal space communicates with the refrigerant pipe 160. In FIG. 1, the intermediate plates 131 and 132 are shown as being arranged one by one (two in total). However, the present invention is not limited to this, and in order to adjust the size of the internal space of the refrigerant diffusion portion 130. A combination of three or more sheets may be used.

  In addition, each opening part 112a, 113a, 121a-121d, 122a-122d, 131a, 132a of each plate 111-113, 121, 122, 131-133 and each pipe hole 130a, 130b, 133a are cut and pressed. It is formed by processing, etching processing or the like.

  Then, a predetermined amount of refrigerant is injected from the refrigerant sealing pipe 160, and the refrigerant passes through the refrigerant flow path 120 </ b> B of the heat exchange unit 120 from the refrigerant diffusion unit 130 and is stored so as to mainly fill the refrigerant tank unit 110. Here, chlorofluorocarbon (HFC134a) is used as the refrigerant. As other refrigerants, water, alcohol, fluorocarbon, or the like may be used. Note that the opening side of the refrigerant sealing pipe 160 is sealed by welding or the like after the refrigerant is injected.

  Next, the operation and effect of this embodiment will be described. The refrigerant in the refrigerant tank part 110 receives the heat of the heating element 10 to evaporate, rises to the refrigerant flow path 120B side, flows into the refrigerant diffusion part 130, and diffuses. When the diffused refrigerant descends again in the refrigerant flow path 120B, it is cooled by the cooling water flowing through the cooling water flow path 120A to be condensed and liquefied, and is returned to the refrigerant tank 110 by its own weight. Thus, the boiling cooler 100 transports the heat of the heating element 10 by boiling vaporization, and cools the heating element 10 by releasing the latent heat of condensation at the time of condensing into a cooling water.

  In the boiling cooler 100, the cooling water flows in from the inlet pipe 140, passes through the inlet-side openings 121b and 122b, extends in the direction in which the surfaces of the intermediate plates 121 and 122 expand through the cooling water channel 120A, and It flows in the direction intersecting the direction in which the intermediate opening 122a is displaced, that is, from the front side to the back side of the paper surface in FIG. And the cooling water which distribute | circulated the cooling water flow path 120A flows out from the exit pipe 150 through the exit side opening parts 121c and 122c.

  In the present invention, the cooling water flow path 120A is exposed to the corrosive environment by the cooling water, but the sacrificial material in the protrusions 122e and the protrusion 121e protruding into the cooling water flow path 120A is preferentially corroded, and the cooling water flow The corrosion resistance of the path 120A can be improved.

  Here, in the cooling water flow path 120A, when the convex part 122e is formed, the concave part 122f is also formed at the same time, and the flow path cross-sectional area of the cooling water flow path 120A can be increased by the concave part 122f. Resistance can be reduced.

  Further, as described above, the flow direction of the cooling water in the cooling water flow path 120A is perpendicular to the paper surface in FIG. 5 (from the front side to the back side). Distribution resistance can be reduced regardless of the size.

  In addition, since the surface area in the cooling water flow path 120A can be increased by the incidental convex part 122e and the concave part 122f, the heat exchange performance as the boiling cooler 100 can be improved.

  Also, in the coolant channel 120B, similar to the coolant channel 120A, the convex portion 122e and the protruding portion 121e are formed. Therefore, the surface area in the coolant channel 120B is increased to increase the coolant channel 120A. The heat exchange performance with the side can be improved.

(Other embodiments)
In the first embodiment, the present invention has been described as being applied to the boiling cooler 100. However, the present invention is not limited to this, and a fluid is caused to flow in a flow path corresponding to the cooling water flow path 120A. For example, it can be widely applied as a heat exchanger (specifically, a radiator, a heater core, an oil cooler, a heat sink, etc.) for exchanging heat with air), an external heating material, or the like.

  Moreover, the flow direction of the cooling water flowing through the cooling water flow path 120A may be the stacking direction of the intermediate plates 121 and 122 with respect to the first embodiment.

It is a front view which shows the external appearance of the boiling cooler in 1st Embodiment. It is a top view which shows the boiling cooler in FIG. It is a top view which shows each plate which forms a refrigerant tank part. It is a top view which shows each plate which forms a heat exchange part. It is a fragmentary sectional view which shows the AA part in FIG. It is a top view which shows each plate which forms a refrigerant | coolant diffusion part.

Explanation of symbols

10 Heating element 100 Boiling cooler (stacked heat exchanger)
110 Refrigerant tank portion 111 Lower plate (plural plate members)
112 Intermediate plate (plural plate members)
113 Intermediate plate (plural plate members)
120A Cooling water channel (fluid channel)
120B Refrigerant flow path 121 Intermediate plate (first plate-like member)
121a Intermediate opening (first opening)
121d Refrigerant opening (third opening)
122 Intermediate plate (second plate member)
122a Intermediate opening (second opening)
122d Refrigerant opening (fourth opening)

Claims (4)

A first plate member (121) having a first opening (121a) and a second plate member (122) having a second opening (122a) are laminated together to form the first opening (121a). In the stacked heat exchanger in which the second opening (122a) communicates with each other to form a fluid flow path (120A) through which fluid flows,
A sacrificial material is provided on at least one surface of each of the first and second plate-like members (121, 122),
The stacked heat exchanger according to claim 1, wherein the second opening (122a) has substantially the same opening shape as the first opening (121a) and is formed at a shifted position.   The fluid is in a direction in which the surfaces of the first and second plate-like members (121, 122) expand in the fluid flow path (120A) and the direction in which the second opening (122a) is displaced. The stacked heat exchanger according to claim 1, wherein the stacked heat exchanger flows in an intersecting direction. One of the first and second plate-like members (121, 122) in the stacking direction is formed by a plurality of plate-like members (111 to 113), a refrigerant is stored inside, and a heating element is formed on the external surface. A refrigerant tank part (110) to which (10) is attached is provided;
The third opening (121d) provided in the first plate-like member (121) and the fourth opening (122d) provided in the second plate-like member (122) communicate with each other, whereby the refrigerant flow path. (120B) is formed,
The stacked heat exchanger according to any one of claims 1 and 2, wherein the refrigerant flow path (120B) communicates with the refrigerant tank section (110).   The stacked type according to claim 3, wherein the fourth opening (122d) has substantially the same opening shape as the third opening (121d) and is formed at a shifted position. Heat exchanger.

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