JP4405782B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchange device having a novel joining structure made of an aluminum nitride sintered body. Specifically, the heat exchange device has a structure capable of precisely forming a heat medium flow path for supplying a heat medium.

  Conventionally, an aluminum nitride sintered body has been used as a heat conductive material instead of a metal because it has high thermal conductivity and electrical insulation. That is, there is a heat exchange device as an application for heat conduction in which a material such as metal cannot be used due to the influence of conductivity or the like.

  Generally, a heat exchange device is made of a metal, which is a heat conductive material having a heat medium flow path through which a heat medium passes, and has a heat exchange surface on the surface thereof. In some cases, there is a structure in which a hole is provided in the interior while avoiding the heat medium flow path, and heat exchange is performed by passing a heat exchange fluid through the hole.

  However, when an aluminum nitride sintered body is used as the material for the heat exchange device, it is possible to manufacture a structure having a hollow interior, particularly a structure having a winding space like a heat medium flow path, as an integrally molded product. Have difficulty. Temporarily, when it is going to manufacture by integral molding, first, the method of obtaining the lump which has the same external shape which consists of an aluminum nitride sintered compact, and carving out the inside can be considered, but this method is, There are problems that the production efficiency is low, the yield is low, and the manufacturing cost is high.

  Therefore, in order to configure the heat medium flow path, the heat exchange device is divided by a plane passing through the central portion of the heat medium flow path, and each member is molded into a shape that can be integrally molded. A method has been proposed in which a heat exchanging device having a heat medium flow path is formed by joining together in the vertical direction (see Patent Document 1).

  However, as the diameter of the heat medium flow path is reduced or complicated, it becomes difficult to align the flow path patterns formed on the divided molded body on a plane, and the flow path is not completely formed. There are concerns about problems such as cutting and cutting. Further, when it is intended to arrange the heat medium flow path not only in the horizontal direction but also in the vertical direction, it is necessary to perform the above division at a plurality of locations, and the manufacturing process becomes extremely complicated.

Japanese Patent Laid-Open No. 10-107194

  Accordingly, an object of the present invention is to provide a heat exchanging device which is made of an aluminum nitride sintered body and has a structure that can very easily form a heat medium flow path therein.

  In order to achieve the above object, the present inventors have conducted intensive research. As a result, the heat exchanging device is divided into a main body portion where the straight pipe portion of the heat medium flow path exists and both end portions thereof, and is integrally formed, and the main body member has a through-hole serving as the straight pipe portion. It is found that the heat medium flow path can be formed very accurately by forming a groove portion connecting the end portions of the through-holes at the joint portion, and by joining the holes to the joining portion. It came to complete.

That is, according to the present invention, there is provided a heat exchange device made of an aluminum nitride sintered body, wherein (a) a main body member having a plurality of through-holes opened in the end face, and (b) both end faces of the main body member. And a heat medium flow path is formed by providing a groove portion connecting the opening of the through hole in the main body member and / or the end member at the joint portion. Both ends are opened to form a heat medium supply port and a heat medium discharge port, and further, in the main body member, a flow path for the heat exchange fluid is formed at a position not intersecting the heat medium flow path. A featured heat exchange device is provided.

  According to the present invention, a heat exchange device composed of an aluminum nitride sintered body is formed with a body member formed with a heat medium flow path of a heat exchanger as a through-hole and a structure that connects the through-holes. Compared to a conventional heat exchange device with a structure in which the heat medium flow path is cut horizontally, by dividing it into members and joining them, it is extremely precise and complicated. It is possible to accurately form the heat medium flow path, and it is possible to perform high-level temperature control on the heat exchange surface mainly composed of the main body member.

  In addition, it is possible to realize a heat exchange device in which the heat medium flow path is three-dimensionally substantially impossible with conventional devices.

  Hereinafter, the present invention will be described more specifically with reference to the accompanying drawings. However, the present invention is not limited to these accompanying drawings.

  FIG. 1 is a schematic view showing the structure of a typical embodiment of the heat exchange apparatus of the present invention, and FIG. 2 is a plan perspective view of the structure.

  The heat exchange device 1 of the present invention is made of an aluminum nitride sintered body, and (a) a main body member 2 having a plurality of through-holes 5 opened on the end face and (b) bonded to both end faces of the main body member 2, respectively. In the joint portions 6 and 7, the main body member 2 and / or the end members 3 and 4 are provided with groove portions 8 that connect the opening portions of the through holes to form a heat medium flow path. The both ends of the heat medium flow path are formed to form a heat medium supply port 9 and a heat medium discharge port 10.

  In the present invention, a known material is used for the aluminum nitride sintered body without any particular limitation. In particular, the thermal conductivity is 70 W / m · K or more, particularly 180 to 250 W / m · K. It is preferable for exhibiting high performance as a heat exchange device. In consideration of durability during handling or use of the apparatus, the strength bending strength is 200 MPa or more, preferably 300 to 600 MPa.

  In the heat exchange device of the present invention, the main body member 2 has a plurality of through-holes 5 opened in the end face. The shape of the main body member is not particularly limited, but is a shape having a thickness that allows the through-hole 5 to be formed therein. The upper limit of the thickness is not particularly limited, and may be appropriately determined according to the application. In addition, the planar shape may be appropriately determined according to the shape of the attachment location, but a rectangular shape, an ellipse, a circle, a polygon, and the like shown in FIG. 1 are not particularly limited and are employed. However, it is preferable to planarize the structure of the joint surface with the end member 3 in order to easily design each member and to perform the joining reliably. In the case where the planar shape is a circle, if a preferred embodiment is specifically shown, the embodiment shown in FIG. 6 which is a plan view (cross section) showing the position embodiment of the heat exchange device of the present invention can be mentioned.

  The through hole 5 is for forming a heat medium flow path. The through hole 5 is preferably a straight pipe as shown in FIG. Moreover, what is necessary is just to determine the diameter of the through-hole 5, a number, etc. suitably according to the magnitude | size of a heat exchange apparatus, and a use.

  For example, in the case of a heat exchange device having a size of 150 mm × 50 mm × 10 mm, the diameter of the through hole 5 serving as a flow path is generally 1 to 8 mm, and the number of the through holes 5 is generally 2 to 25. .

  Further, the through holes 5 can be formed in a plurality of rows as shown in FIG. 4 showing a cross-sectional view in addition to a mode in which one row is provided in the plane direction as shown in FIG.

  Furthermore, the through-hole serving as the end of the heat medium flow path is generally opened at the joint surface as shown in FIG. 1 and further communicated with the heat medium supply port 9 and the discharge port 10. You may open in the side surface of the main body member 2, and may form the supply port and discharge port of a heat carrier (not shown).

  In the heat exchanging device of the present invention, the heat medium flow path is formed by providing the body member 2 with the above-described through-holes. Therefore, even if the diameter is small and the number is large, the heat medium flow path is accurately defined. Can be formed.

  In the present invention, the end member 4 is joined to the main body member 2 to seal the opening of the through-hole 5, and the end portion is communicated with the groove portion 8 at a necessary location to continuously heat the medium. It is for forming a flow path.

  As shown in FIG. 1, the embodiment in which the opening at the end of the communication hole 5 is communicated to form the heat medium flow path is an embodiment in which the groove portion 8 connecting the opening of the through hole is provided in the main body member 2, and the end member. A mode in which the groove portion 8 connecting the opening portions of the through holes to 3 and 4 is provided, or a mode in which both the main body member and the end member are provided.

  However, in order to reduce the labor for matching the groove 8 and the through-hole 5 in joining and form the groove easily and accurately, as shown in FIG. 1, the end of each communication hole 5 is formed on the body member 2 side. It is most preferable that the groove portion 8 connecting the opening portions is provided and the joining surfaces of the end members 3 and 4 are flat.

  In the embodiment shown in FIG. 1, the heat medium supply port 9 and the discharge port 10 for the heat medium flow path are respectively opened in the end members 3 and 4.

  The supply port 9 and the discharge port 10 for the heat medium may be provided with a structure for connecting to a connected pipe, for example, a flange, a screw, or the like, if necessary.

  In the present invention, the main body member 2 and the end members 3 and 4 are joined to constitute a heat exchange device. The manner of joining is not particularly limited, but the joining is preferably performed so that the bending strength of the joined portion is 80% or more of the unjoined portion.

  Other aspects in the heat exchange apparatus of the present invention are not particularly limited. If a suitable aspect is illustrated, the heat exchange apparatus 1 of this invention will provide the through-hole 11 which does not cross | intersect the through-hole 5, and forms the flow path of a to-be-heat-exchanged fluid, as shown in FIG. Heat exchange can also be performed in the interior. Although not shown, it is also possible to increase the surface area by providing irregularities or fins on the surface of the main body member.

  In the manufacturing method of the heat exchange device of the present invention, a mode in which the main body member and the end member are manufactured and joined together is employed without any particular limitation.

  As a method for obtaining the main body member and the end member base, aluminum nitride powder is mixed with a known sintering aid, a binder, a solvent, etc., if necessary, and then known as press molding, casting molding, or the like. Although the method of shape | molding by this method is mentioned, It is not restrict | limited to these methods.

  Further, in the base body of the main body member, a through-hole is drilled at a required location by a drill or the like, and a groove is formed at the required location of the opening. Further, in the base member of the end member, a supply port and a discharge port for the heat medium are generally provided by drilling at a portion that becomes an end portion of the heat medium flow path formed in the main body member.

  After that, in the state in which the processed base is press-contacted at each joint surface, if necessary, organic substances such as binder used at the time of molding are degreased, and then sintered to be a main body member And an end member can be obtained.

  As the degreasing and sintering conditions, known conditions are employed without particular limitation. For example, degreasing is performed at 400 to 650 ° C. for 1 to 10 hours in a reducing, neutral or oxidizing atmosphere. Sintering is performed at 1650 to 1950 ° C. for 3 to 20 hours in a reducing or neutral atmosphere. In this case, in order to further improve the thermal conductivity, it is preferable to perform sintering in a reducing atmosphere and sintering in a neutral atmosphere in multiple stages.

  Moreover, in the case of the said joining, a stronger joining can be implement | achieved by performing the said operation after apply | coating the paste of aluminum nitride and / or a sintering auxiliary agent on a joining surface, and it is preferable.

  Further, as another joining method, after the above processed mother bodies are degreased and sintered, respectively, a paste of a sintering aid is applied to the joining surface, and heat treatment is performed at a temperature of 1650 to 1950 ° C. in a pressed state. Can also be adopted.

  In the present invention, in order to increase the water resistance of the obtained heat exchange device, it is preferable to form an oxide layer on the surface thereof. The thickness of the oxide layer is preferably about 0.2 to 1 μm, and a known method is employed without particular limitation as the formation method.

  The heat exchange apparatus of the present invention can be used effectively in a field where a heat exchange apparatus using a metal as a constituent material cannot be used. For example, it is suitable for applications in which a heat exchange fluid is heated or cooled in a state where a microwave, millimeter wave, or the like is applied, in which a metal member cannot be used.

  EXAMPLES Hereinafter, examples will be shown to describe the present invention more specifically, but the present invention is not limited to such examples.

  In the examples, the thermal conductivity of the aluminum nitride sintered body was measured by LF / TCM FA8510B (Rigaku Corporation) using a one-dimensional laser flash method. The three-point bending strength was measured according to JIS R1601. The surface temperature was measured using an infrared thermography method using Neothermo TVS-700 (Nippon Avionics Co., Ltd.).

Example 1
A heat exchange device having a structure of 150 × 50 × 10 mm and a channel diameter of 3 mm shown in FIG. 1 was manufactured by the following method.

  100 parts by weight of aluminum nitride powder (H grade made by Tokuyama Co., Ltd.), 5 parts by weight of fine yttrium oxide powder as sintering aid, 4 parts by weight of methyl acrylate ester as organic binder, and 100 parts by weight of ethanol in a ball mill A slurry was prepared by mixing for 24 hours. This slurry was granulated at 100 ° C. with a spray dryer to obtain granules having an average particle size of 80 μm. The granule was hydraulically pressed at a pressure of 100 MPa to obtain a molded body of □ 200 × t12 mm. Next, by processing this single molded body, there are three 156 × 60 × 12 mm main body members having a φ3.6 mm flow path and groove portions connecting the respective flow paths, and a φ3.6 opening 12. Six end members of × 60 × 12 mm were obtained.

  On the other hand, the bonding paste was prepared by mixing 100 parts by weight of aluminum nitride powder, 5 parts by weight of yttrium oxide as a sintering aid, 3 parts by weight of ethyl cellulose (grade 4 centipoise) as an organic binder, and 50 parts by weight of terpineol as a vehicle. did.

  The paste obtained by the above method was applied to the joining surface of one main body member and two end members and joined.

  The molded body thus adhered was dried at room temperature all day and night, degreased in the atmosphere at 600 ° C., and fired in a nitrogen atmosphere at 1830 ° C. to obtain an aluminum nitride heat exchanger.

  The obtained aluminum nitride was measured for thermal conductivity by a one-dimensional method. The size of the sample for measurement is φ10 × t4 mm, and this sample is cut out from the aluminum nitride heat exchange device obtained by the above method so that the joint is at the center of the thickness of the sample. It was.

  Moreover, the sample of the same size which consists of a base material part which does not contain this junction part was also created, and the heat conductivity was measured. Moreover, the bending strength measurement of a junction part was performed by the 3 point | piece bending method, creating a sample so that a junction part might come to the center. The results are shown in Table 1.

  The thermal conductivity of the joint portion was 176 W / m · K in the base material portion, whereas it showed 100% thermal conductivity. The bending strength was 337 MPa in the base material portion, whereas it was 99 % Strength.

  Further, the temperature distribution on the surface of the heat exchanger when 80 ° C. warm water was passed through the flow path of the heat exchanger at 1 cm / sec was measured by infrared thermography. As a result, the temperature distribution difference on the surface of the main body member was 4 deg or less, and it was confirmed that the heat medium flow path was in perfect communication. In addition, there was no leakage of the heat medium.

The perspective view which shows the typical aspect of the heat exchange apparatus of this invention The top view which shows the structure of the flow path of the heat exchange apparatus of FIG. The top view which shows the one aspect | mode which provided the groove part in the end member in the heat exchange apparatus of this invention. Sectional drawing which shows the one aspect | mode which provided the communication hole in the multistage in the main-body member in the heat exchange apparatus of this invention Sectional drawing which shows the one aspect | mode which provided the flow path of the heat exchange fluid in the main-body member in the heat exchange apparatus of this invention. The heat exchange apparatus of this invention WHEREIN: The top view which shows one aspect | mode when a planar shape is a circle | round | yen

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchange apparatus 2 Main body member 3, 4 End member 5 Through-hole 6, 7 Joint part 8 Groove part 9 Heat medium supply port 10 Heat medium discharge port 11 Flow path of heat exchange fluid

Claims (2)

A heat exchange device made of an aluminum nitride sintered body, comprising: (a) a main body member having a plurality of through-holes opened in the end face; and (b) end members joined respectively to both end faces of the main body member. The heat medium flow path is formed by providing the main body member and / or the end member with a groove portion that connects the opening portion of the through hole, and both ends of the heat medium flow path are opened to A heat exchange apparatus comprising a medium supply port and a heat medium discharge port, and further, a heat exchange fluid channel formed in a position not intersecting the heat medium channel in the main body member . The heat exchange device according to claim 1, wherein the main body member is provided with a groove portion that connects the opening portion of the through hole to form a heat medium flow path.

Images