JP2012196985A - Heater for heat medium and air conditioner for vehicle with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heater for heat medium which is reduced in size and cost, can enhance heat transfer performance and can efficiently cool thermogenic electric parts on a board to control a PTC heater, by reducing the thermal contact resistance between a flat heat exchanging tube and the PTC heater.SOLUTION: The heater for heat medium includes a plurality of flat heat exchanging tubes 12, the PTC heaters 13, which are assembled between the flat tube parts, a heat exchanging presser 15, which presses and fixes the flat heat exchanging tubes 12 and the PTC heaters 13 from the side of one face of the flat heat exchanging tube 12 against the inner face of a casing 11, and a control board 17, which is arranged on the heat exchanging presser 15 and on the surface of which a control circuit 21, including the thermogenic electric parts 20 for controlling the PTC heater 13, is mounted. The control board 17 is provided with a heat through part which passes through to both sides, corresponding to the mounting position of the thermogenic electric parts 20, and the thermogenic electric parts 20 are mounted to be coolable through the heat through part, using the heat exchanging presser 15 as a heat sink.

Description

  The present invention relates to a heat medium heating device that heats a heat medium using a PTC heater, and a vehicle air conditioner including the heat medium heating device.

  In a vehicle air conditioner applied to an electric vehicle, a hybrid vehicle, or the like, a positive temperature coefficient thermistor element (hereinafter referred to as “Positive Temperature Coefficient”) is used as one of heat medium heating devices that heat a medium to be heated as a heat source for heating. A device using a PTC heater having a heat generating element as a PTC element) is known. The PTC heater has a positive thermistor characteristic, and the resistance value increases as the temperature rises. As a result, the current consumption is controlled and the temperature rises gradually. Reaches the saturation region and stabilizes, and has a self-temperature control characteristic.

  In the heat medium heating apparatus as described above, Patent Document 1 provides a large number of partition walls that divide the inside of the housing into a heating chamber and a heat medium circulation chamber in a housing having an inlet and an outlet for the heat medium. A heating medium heating device is presented in which a PTC heating element is inserted and installed on the side of the heating chamber partitioned by the partition so as to be in contact with the partition, and the heating medium circulated to the circulation chamber through the partition is heated. ing.

  In Patent Document 2, a PTC heater is configured by providing an electrode plate, an insulating layer, and a heat transfer layer on both sides of a PTC element, and an inlet and an outlet for a heat medium are provided on both sides of the PTC heater. A heat medium heating apparatus having a laminated structure in which a pair of heat medium flow boxes communicated with each other is stacked, and a substrate storage box for storing a control substrate and a lid are provided on the outer surface of the heat transfer medium.

JP 2008-7106 A JP 2008-56044 A

  However, the one disclosed in Patent Document 1 has a configuration in which a PTC heating element is inserted and installed in a heating chamber formed by a partition wall. For this reason, it is not easy to insert and install the PTC heating element in close contact between the partition walls serving as the heat transfer surface, and the contact thermal resistance between the partition walls and the PTC heating element increases, resulting in a decrease in heat transfer efficiency. On the other hand, when it was attempted to increase the adhesion by narrowing the interval between the partition walls, there was a problem that the workability of assembly was remarkably lowered and the number of man-hours increased.

  Moreover, the thing of patent document 2 laminated | stacked a pair of heat-medium distribution | circulation boxes which have a radiation fin on both surfaces of a PTC heater, laminated | stacked the board | substrate accommodation box and lid which accommodate a control board on the outer surface, and fastened with the volt | bolt. Since it is set as a structure, a PTC heater and a heat carrier distribution box can be stuck and contact thermal resistance between them can be reduced. However, since it is difficult to arrange multiple layers of PTC heaters, the plane area becomes large, and a heat medium distribution box and a dedicated substrate storage box are required. These are made of aluminum die casting from the viewpoint of heat resistance and heat transfer. Therefore, there is a limit to the reduction in size and weight, and there are problems such as high cost.

  This invention is made | formed in view of such a situation, Comprising: As a structure which laminated | stacked the flat heat exchanger tube and the PTC heater in multiple layers, the contact thermal resistance between them is reduced, and heat-transfer performance is improved. In addition, there is provided a heat medium heating device that is capable of efficiently cooling a heat-generating electrical component on a control board that controls a PTC heater with a flat heat exchange tube, and that is reduced in size and weight, and a vehicle air conditioner including the heat medium heating device. For the purpose.

In order to solve the above-described problems, the heat medium heating device of the present invention and the vehicle air conditioner including the same employ the following means.
That is, the heat medium heating device according to the present invention includes a plurality of flat heat exchange tubes that are flown out of the outlet header portion after the heat medium flowing in from the inlet header portion flows through the flat tube portion, and a plurality of the heat exchanger tubes stacked on each other. A PTC heater incorporated between the flat tube portions of the flat heat exchanger tubes, and a plurality of the flat heat exchanger tubes and the PTC heaters stacked on each other from one surface side of the flat heat exchanger tube to the casing inner surface side. A heat exchanger pressing member that is pressed and brought into close contact; and a control board that is disposed on the heat exchanger pressing member and on which a control circuit including a heat-generating electrical component that controls the PTC heater is surface-mounted, The control board is provided with a heat-penetrating portion made of a high thermal conductive material that is penetrated on both sides corresponding to the mounting position of the heat-generating electrical component, and the heat-generating electrical component is The serial heat exchanger holding member and the heat sink, characterized in that it is coolable implemented through the heat penetration portion.

  According to the present invention, a plurality of flat heat exchanger tubes are laminated, and each flat heat exchanger tube and the PTC heater are pressed by the heat exchanger pressing member in a state where the PTC heater is incorporated between the flat tube portions. A control board on which a control circuit including a heat generating electrical component for controlling the PTC heater is surface-mounted is disposed on the heat exchanger pressing member, and the control board generates heat. A heat-penetrating part made of a highly heat-conductive material that is penetrated on both sides corresponding to the mounting position of the heat-generating electrical component is provided, and the heat-generating electrical component is cooled via the heat-penetrating part with the heat exchanger pressing member as a heat sink Since the PTC heaters are sandwiched between a plurality of flat heat exchanger tubes, they are stacked and pressed by a heat exchanger pressing member, so that they are in close contact with each other. It can be incorporated into Te. Therefore, the contact heat resistance between the flat heat exchanger tube and the PTC heater can be reduced to improve the heat transfer efficiency, the performance of the heat medium heating device can be improved, and the flat heat exchanger tube and the PTC heater can be multilayered. By arranging the layers, the plane area can be reduced, and the heat exchange module, and hence the heat medium heating device, can be made compact. In addition, since the control board is arranged on the heat exchanger pressing member that presses one side of the flat heat exchanger tube, heat-generating electrical components mounted on the control board are passed through the heat exchanger pressing member as a heat sink. Can be efficiently cooled via the unit, thereby ensuring the ease of assembly of the control board and the reliability of heat, and eliminating the dedicated board storage box and large heat medium distribution box, etc. The heating device can be reduced in size and weight, and the cost can be reduced.

  Furthermore, the heat medium heating device of the present invention is characterized in that, in the heat medium heating device, the heat exchanger pressing member is a plate made of an aluminum alloy.

  According to the present invention, since the heat exchanger pressing member is a plate made of an aluminum alloy, the heat from the heat-generating electrical component on the control board passes through the heat penetrating portion and has a good thermal conductivity and is lightweight aluminum. The heat-generating electrical component can be cooled by transferring heat to the heat exchanger presser member, which is an alloy plate, and dissipating heat to the heat exchanger presser member using the flat heat exchanger tube as a cooling source. Therefore, it is possible to improve the cooling performance of the heat-generating electrical components that are surface-mounted on the control board by using the heat exchanger pressing member as a heat sink, improve heat reliability, and maintain weight reduction. it can.

  Furthermore, the heat medium heating device of the present invention is the heat medium heating device according to any one of the above-described ones, wherein a predetermined thickness made of a highly heat conductive material is provided between the heat exchanger pressing member and the heat penetration portion of the control board. The spacer member is interposed.

  According to the present invention, since the spacer member having a predetermined thickness made of a high thermal conductivity material is interposed between the heat exchanger pressing member and the heat penetration portion of the control substrate, the control substrate is placed on the heat exchanger pressing member. Even when it is necessary to secure a certain gap between them, for example, by installing a spacer member of a predetermined thickness made of a high thermal conductivity material such as an aluminum alloy plate material, The member can function as a heat sink, and the heat-generating electrical component surface-mounted on the control board can be reliably cooled. Therefore, even in such a case, it is possible to improve the cooling performance for the control board, ensure the reliability with respect to heat, and maintain the weight reduction.

  Furthermore, the heat medium heating device according to the present invention is the heat medium heating device according to any one of the above, wherein the control board includes a plurality of terminal blocks arranged in parallel on one side of the surface side of the control substrate. A plurality of terminals extending from one end of electrode plates provided on both surfaces of the PTC heater can be directly connected.

  According to the present invention, a plurality of terminal blocks are juxtaposed on one side of the surface side of the control board, and a plurality of terminals extending from one end of the electrode plate provided on both sides of the PTC heater with respect to the terminal block. Can be directly connected to each other, so that a control board on which a control circuit including a heat-generating electrical component for controlling the PTC heater is surface-mounted and an electrode plate provided on both sides of the PTC heater are connected to the control board. Electrical connection can be achieved by directly connecting a terminal extended from one end of the electrode plate on the surface side of the control board to a terminal block arranged in parallel on one side of the surface side. Therefore, the wiring work between the control board and the electrode plate can be facilitated and the assemblability can be improved, and the number of parts can be reduced by eliminating the harness, thereby simplifying the configuration and reducing the cost.

  Furthermore, the heat medium heating device of the present invention is the heat medium heating device according to any one of the above, wherein the flat heat exchanger tube and the PTC heater communicate with the inlet header portion and the outlet header portion in a state of being stacked on each other. It is characterized by being clamped and fixed to the inner bottom surface of the casing provided with the heat medium inlet passage and the heat medium outlet passage, via the heat exchanger pressing member.

  According to the present invention, a casing having a heat medium inlet path and a heat medium outlet path in which a plurality of flat heat exchange tubes and a PTC heater communicate with the inlet header portion and the outlet header portion in a stacked state. Since it is configured to be fastened and fixed to the inner bottom surface via a heat exchanger pressing member, a plurality of flat heat exchanger tubes and PTC heaters stacked on each other are attached to the inner bottom surface of the casing via the heat exchanger pressing member. By tightening and fixing, it is possible to fix them in close contact with each other. Therefore, the flat heat exchanger tube and the PTC heater can be easily and reliably assembled in the assembly process, and the contact heat resistance between the flat heat exchanger tube and the PTC heater is reduced to improve the heat transfer performance. In addition, the assembling property can be improved. In addition, the casing does not necessarily need to be made of an aluminum alloy material having heat resistance or heat conductivity, and the weight can be reduced and the cost can be reduced by using a resin material.

  Furthermore, the vehicle air conditioner according to the present invention is configured such that the heat medium heated by the heat medium heating device can be circulated with respect to the radiator disposed in the air flow path. The heat medium heating device is any one of the above-described heat medium heating devices.

  According to the present invention, since the heat medium heated by any one of the above-described heat medium heating devices can be circulated with respect to the radiator disposed in the air flow path, The heat medium supplied to the radiator disposed in the path can be heated and supplied by the above-described heat medium heating device that is small and light and has high performance. Therefore, it is possible to improve the air conditioning performance, particularly the heating performance, in the vehicle air conditioner, and to improve the mountability of the air conditioner on the vehicle.

  According to the heat medium heating device of the present invention, a PTC heater is sandwiched between a plurality of flat heat exchanger tubes, respectively, and they are assembled by pressing them with a heat exchanger pressing member so that they are brought into close contact with each other. Therefore, it is possible to improve the heat transfer efficiency by reducing the contact heat resistance between the flat heat exchanger tube and the PTC heater, and to improve the performance of the heat medium heating device. In addition, the flat heat exchanger tube and the PTC heater are multi-layered. By laminating and arranging them, the plane area can be reduced, and the heat exchange module and thus the heat medium heating device can be made compact. In addition, since the control board is arranged on the heat exchanger pressing member that presses one side of the flat heat exchanger tube, heat-generating electrical components mounted on the control board are passed through the heat exchanger pressing member as a heat sink. Can be efficiently cooled via the unit, thereby ensuring the ease of assembly of the control board and the reliability of heat, and eliminating the dedicated board storage box and large heat medium distribution box, etc. The heating device can be reduced in size and weight, and the cost can be reduced.

  In addition, according to the vehicle air conditioner of the present invention, the heat medium supplied to the radiator disposed in the air flow path is reduced by the above-described heat medium heating apparatus that is small, light, and high in performance. Since it can heat and supply, while improving the air-conditioning performance in a vehicle air conditioner, especially heating performance, the mounting property of the air-conditioner with respect to a vehicle can be improved.

It is a schematic block diagram of the vehicle air conditioner provided with the heat-medium heating device which concerns on 1st Embodiment of this invention. It is a disassembled perspective view of the heat carrier heating apparatus shown in FIG. It is a top view of the state which removed the upper case of the heat carrier heating apparatus shown in FIG. It is an AA cross-section equivalent view of the heat carrier heating apparatus shown in FIG. It is a front view of the state which assembled | attached the flat heat exchanger tube of the heat carrier heating apparatus shown in FIG. 2, a PTC heater, a metal heat exchanger pressing member, and a control board. It is a right view of the state which abbreviate | omitted a part of member shown in FIG. It is a front view of the state which assembled | attached the flat heat exchanger tube of the heat medium heating apparatus which concerns on 2nd Embodiment of this invention, a PTC heater, a metal heat exchanger pressing member, and a control board. It is a right view of the state which abbreviate | omitted a part of member shown in FIG.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic configuration diagram of a vehicle air conditioner including a heat medium heating device according to the first embodiment of the present invention. The vehicle air conditioner 1 is provided with a casing 3 that forms an air flow passage 2 for taking outside air or vehicle interior air and adjusting the temperature thereof, and then guiding it to the vehicle interior.

  Inside the casing 3, the air or the passenger compartment air is sequentially sucked from the upstream side to the downstream side of the air flow passage 2 to increase the pressure, and the blower 4 pumps it to the downstream side. The flow rate ratio of the cooler 5 that cools the air, the radiator 6 that heats the air that has passed through the cooler 5, and the amount of air that passes through the radiator 6 and the amount of air that bypasses the radiator 6 An air mix damper 7 that adjusts the temperature of the temperature-controlled air by adjusting and air-mixing on the downstream side thereof is installed.

The downstream side of the casing 3 is connected to a plurality of outlets that blow out the temperature-controlled air into the vehicle compartment via an outlet mode switching damper and a duct (not shown).
The cooler 5 constitutes a refrigerant circuit together with a compressor, a condenser, an expansion valve, etc., not shown, and cools the air passing therethrough by evaporating the refrigerant adiabatically expanded by the expansion valve. . The radiator 6 constitutes a heat medium circulation circuit 10 </ b> A together with the tank 8, the pump 9, and the heat medium heating device 10, and a high-temperature heat medium (for example, antifreeze liquid) heated by the heat medium heating device 10 is pump 9. The air passing therethrough is heated by being circulated through the.

2 is an exploded perspective view of the heat medium heating device 10 shown in FIG. 1, FIG. 3 is a plan view of the heat medium heating device 10 with the upper case removed, and FIG. FIG. 3 is a cross-sectional view corresponding to AA in FIG.
As shown in FIG. 2, the heat medium heating device 10 includes a box-shaped casing 11 (however, only the lower case 11A constituting the casing 11 is shown, and the upper case constituting the upper half thereof is not shown. A heat exchange module 14 in which a plurality of (for example, three) flat heat exchange tubes 12 and a plurality of sets of PTC heaters 13 are alternately stacked, and the heat exchange module 14 is a lower case of the casing 11. From a heat exchanger pressing member 15 for pressing and fixing to the inner bottom surface of 11A, and a control board 17 for controlling a PTC heater 13 disposed on the heat exchanger pressing member 15 via a pair of spacer members 16 It is configured.

  The casing 11 has a box-like structure that is divided into an upper half and a lower half, and an upper case (not shown) located in the upper half with respect to the lower case 11A located in the lower half. ) Are screwed and fixed to be integrated. In the internal space of the casing 11, the heat exchange module 14 including the flat heat exchange tube 12 and the PTC heater 13, the heat exchange pressing member 15, the pair of spacer members 16, the control board 17, and the like are accommodated and installed. It has become.

  On the lower surface of the lower case 11A, a heat medium inlet channel 11B for guiding the heat medium introduced into the three laminated flat heat exchanger tubes 12 and a heat medium flowing through the flat heat exchanger tubes 12 are derived. The heat medium outlet passage 11C is integrally formed so as to protrude downward, and the boss portions 11D (four places) for fastening and fixing the heat exchange pressing member 15 are integrally protruded upward. Is formed. The lower case 11A is formed of a resin material (for example, PPS) whose linear expansion coefficient is close to that of the aluminum alloy material forming the flat heat exchanger tube 12 accommodated and installed in the internal space. Note that the upper case is also preferably formed of the same resin material as the lower case 11A.

  Further, a power harness hole and an LV harness hole (both not shown) are formed in the lower surface of the lower case 11A so as to penetrate through the distal end portions of the power harness 18 and the LV harness 19. The power harness 18 is for supplying power to the PTC heater 13 via the control board 17, and has two power harness terminal blocks provided on the control board 17 with the tip portion branched in a bifurcated shape. It can be screwed to 17A via a screw or the like. Further, the LV harness 19 is for transmitting a control signal to the control board 17, and a tip end portion thereof is connectable to the control board 17.

  The control board 17 performs energization control for a plurality of sets of PTC heaters 13 based on a command from the host control unit (ECU), and includes a plurality of power transistors (heat-generating electrical components) 20 made of FETs, IGBTs, or the like. The control circuit 21 including the surface is mounted on the surface, and the energization state of the plurality of sets of PTC heaters 13 can be switched via the control circuit 21. The control board 17 has a heat penetration made of a highly thermally conductive material such as copper or aluminum so as to penetrate through both sides of the board corresponding to a portion where a plurality of power transistors 20 which are heat-generating electrical components are mounted. It is set as the structure by which the part 22 (refer FIG. 4) was provided.

  Then, a plurality of flat heat exchanger tubes 12 are laminated so as to sandwich the plurality of sets of PTC heaters 13 from both sides thereof, and a heat exchange module 14 is configured. The flat heat exchanger tube 12 is formed by stacking tube materials obtained by press-molding aluminum alloy thin plates. As shown in FIGS. 4 to 6, for example, three flat heat exchanger tubes 12 are connected to each other. By laminating them so as to be parallel to each other, PTC heaters 13 are laminated between the flat heat exchanger tubes 12 to constitute a set of heat exchange modules 14.

  Each flat heat exchanger tube 12 includes a flat tube portion 12A having a flat cross-sectional shape with a thickness of about several millimeters, an inlet header portion 12B into which a heat medium is formed at both ends thereof, and an outlet through which the heat medium flows out. It is configured to include a header portion 12C, and corrugated inner fins (not shown) are inserted into the flat tube portion 12A so that a plurality of heat medium flow passages are formed in the tube. It has become.

  The three flat heat exchanger tubes 12 are sequentially laminated in the order of the lower, middle, and upper stages, and the inlet header portion 12B and the outlet header portion 12C at both ends thereof are in close contact with each other via a sealing material such as an O-ring. Communication holes (not shown) provided in the portion 12B and the outlet header portion 12C are communicated with each other. The three flat heat exchanger tubes 12 are assembled in a laminated state or sequentially laminated into the inner bottom surface of the lower case 11A and, as will be described later, heat exchange that is fastened and fixed to the boss portions 11D (four locations) of the lower case 11A. It is configured to be pressed and fixed toward the inner bottom surface of the lower case 11 </ b> A via the pressing member 15.

  Further, a pair of heat exchange modules 14 is configured by sandwiching a PTC heater 13 between the three flat heat exchanger tubes 12. As is well known, the plurality of sets (two sets) of PTC heaters 13 are arranged in such a manner that electrode plates 24 are in contact with the upper and lower surfaces of a PTC element (Positive Temperature Coefficient) 23, respectively, via an insulating sheet or the like. Laminated between the three flat heat exchanger tubes 12. The PTC heater 13 is incorporated into the inner bottom surface of the lower case 11A while being laminated together with the three flat heat exchanger tubes 12 or sequentially laminated, and the inner bottom surface of the lower case 11A via the heat exchanger pressing member 15 as described above. It is designed to be pressed and fixed.

  The electrode plate 24 is for supplying electric power to the PTC element 23, and is made of an aluminum alloy plate material having a rectangular shape in plan view. This electrode plate 24 is disposed on both sides of the PTC element 23 so as to be in contact with the upper surface of the PTC element 23 and one sheet so as to be in contact with the lower surface of the PTC element 23. The PTC element 23 is sandwiched between the upper and lower surfaces by the electrode plate 24.

  Furthermore, the electrode plate 24 disposed on the upper surface side of the PTC element 23 is disposed such that the upper surface thereof is in contact with the lower surface of the flat heat exchanger tube 12, and the electrode plate 24 disposed on the lower surface side of the PTC element 23 is The lower surface is arranged so as to be in contact with the upper surface of the flat heat exchanger tube 12. In the present embodiment, the electrode plate 24 is provided between the lower flat heat exchanger tube 12 and the middle flat heat exchanger tube 12, and between the middle flat heat exchanger tube 12 and the upper flat heat exchanger tube 12. Two sheets, a total of four sheets, are arranged.

  These four electrode plates 24 have substantially the same shape as the flat tube portion 12A of each flat heat exchanger tube 12, and one terminal 24A is integrally provided on each long side. The terminals 24A are arranged along the long sides of the electrode plates 24 so that they do not overlap when the electrode plates 24 are stacked. In other words, the terminals 24A provided on each electrode plate 24 are provided with their positions slightly shifted along their long sides, and are provided so as to be arranged in series when the electrode plates 24 are stacked. ing. Each terminal 24A is provided so as to protrude upward, and is connected to a plurality of sets (four sets) of terminal blocks 17B arranged in parallel on one side of the surface side of the control board 17 via screws or the like. ing.

  The three flat heat exchanger tubes 12 and the two sets of PTC heaters 13 are assembled on the inner bottom surface of the lower case 11A while being laminated or sequentially laminated as described above, and the upper surface of the uppermost flat heat exchanger tube 12 Are pressed in the direction of the inner bottom surface of the lower case 11A via the heat exchanger pressing members 15 that are fastened and fixed to the boss portions 11D (four locations) of the lower case 11A by four screws 25, thereby each flat heat exchanger tube. The upper and lower surfaces of the 12 inlet header portions 12B and the outlet header portion 12C and the flat tube portions 12A of the flat heat exchanger tubes 12 and the upper and lower surfaces of the PTC heater 13 are brought into close contact with each other.

  As a result, the heat exchange module 14 is incorporated into the casing 11, and the heat medium introduced from the heat medium inlet passage 11 </ b> B of the lower case 11 </ b> A flows from the inlet header portion 12 </ b> B of each flat heat exchanger tube 12 into the flat tube portion 12 </ b> A. In the process of being guided and flowing through the flat tube portion 12A, the temperature is raised by the PTC heater 13 and flows out to each outlet header portion 12C, from there through the heat medium outlet passage 11C of the lower case 11A, the heat medium heating device 10 It will be derived to the outside. The heat medium derived from the heat medium heating device 10 is supplied to the radiator 6 via the heat medium circulation circuit 10A (see FIG. 1).

  The heat exchanger pressing member 15 has a function as a heat sink for cooling a plurality of heat-generating electrical components 20 mounted on the surface of the control board 17 through a heat penetration portion 22 made of a highly heat conductive material such as copper or aluminum. It is made of an aluminum alloy plate. The heat exchanger pressing member 15 is sized to cover the upper surface of the flat heat exchanger tube 12, has a longitudinal dimension longer than that of the control board 17, and performs heat exchange including the flat heat exchanger tube 12 and the PTC heater 13. When the module 14 is pressed and fixed, in order to ensure the sealing performance around the inlet header portion 12B and the outlet header portion 12C, it is fastened and fixed to the boss portion 11D of the casing 11 with a screw 25 at a position passing through the center line. It is configured.

  The pair of spacer members 16 are for avoiding interference with the control board 17 disposed on the upper surface side of the heat exchanger pressing member 15 when the position of the screw 25 for stopping the heat exchanger pressing member 15 is restricted to the above position. It is to be intervened. Of the pair of spacer members 16, the spacer member 16 disposed on the side corresponding to at least the exothermic electrical component 20 mounted on the control board 17 and in contact with the heat penetration portion 22 is, for example, It is made of a highly heat conductive material such as an aluminum alloy plate. The other spacer member 16 may be a resin material or the like, and in order to ensure contact with the spacer member 16 at a position corresponding to the pair of spacer members 16 of the heat exchanger pressing member 15, FIG. As shown in FIG. 5, the upward convex surface portion 15A may be formed.

  The control board 17 is fixed to the upper surface side of the heat exchanger pressing member 15 with a plurality of screws 26 via a pair of spacer members 16, and the heat penetration portion 22 is made of a high thermal conductivity material. It arrange | positions so that it may contact. A power harness 18 branched in a bifurcated manner is connected to the terminal block 17A of the control board 17, and an LV harness 19 is connected to the connector. Further, the terminal plate 17B is connected to the electrode plate 24 of the PTC heater 13. By directly connecting the extended terminal 24 </ b> A, the control board 17 is incorporated on the heat exchanger pressing member 15 and accommodated in the casing 11.

  A plurality of exothermic electrical components 20 such as power transistors mounted on the surface of the control board 17 are accommodated and installed in the casing 11 and close to the heat medium inlet path 11B provided in the lower case 11A. That is, the heat penetration part 22 which is arranged corresponding to the inlet header part 12B side of the plurality of flat heat exchange tubes 12 constituting the heat exchange module 14 and penetrates both surfaces of the control board 17, Cooling is performed via a heat exchanger pressing member 15 that is cooled by a heat medium having a relatively low temperature before heating that flows into the inlet header portion 12B, and a spacer member 16 that is made of a high thermal conductivity material.

  The heating medium heating device 10 includes three flat heat exchanger tubes 12 and two sets of PTC heaters 13 on the inner bottom surface of the lower case 11A of the casing 11, and insulating sheets (not shown) on both sides of the PTC heaters 13. While being sandwiched between the two, they are stacked and assembled one by one, and when the heat exchange module 14 is assembled, the upper surface of the heat exchanger pressing member 15 is pressed and fixed to the lower case 11A, or the heat exchange module 14 is fixed. After the replacement module 14 is sub-assembled, it is assembled in the lower case 11A, and the upper surface thereof is pressed and fixed by the heat exchanger pressing member 15, thereby bringing the flat heat exchanger tubes 12 and the PTC heaters 13 into close contact with each other. Can be assembled.

  After that, the control board 17 is screwed and fixed on the heat exchanger pressing member 15 with the spacer member 16 interposed therebetween, the electric system is connected, and the upper case (not shown) is covered with the lower case 11A so as to cover the upper part. The heat medium heating device 10 can be assembled by screwing and fixing to. And this heat medium heating device 10 distribute | circulates the heat medium which flowed in the inlet header part 12B via the heat medium inlet channel 11B in the several flat heat exchanger tube 12, and after heating with the PTC heater 13, it is an exit. By flowing out from the header portion 12C through the heat medium outlet passage 11C, the heat medium circulated in the heat medium circulation circuit 10A is used for heating.

Thus, according to the heat medium heating device 10 and the vehicle air conditioner 1 of the present embodiment, the following operational effects can be obtained.
A plurality of flat heat exchanger tubes 12 are laminated, and each flat heat exchanger tube 12 and the PTC heater 13 are attached to the lower case 11A by the heat exchanger pressing member 15 in a state where the PTC heater 13 is sandwiched between the flat tube portions 12A. On the other hand, it is configured to be pressed and fixed. For this reason, a plurality of flat heat exchanger tubes 12 and a plurality of sets of PTC heaters 13 can be assembled in close contact with each other.

  Therefore, the contact heat resistance between the flat heat exchanger tube 12 and the PTC heater 13 can be reduced to improve the heat transfer efficiency, the performance of the heat medium heating device 10 can be improved, and the flat heat exchanger tube 12 and the PTC By arranging the heaters 13 in multiple layers, the plane area can be reduced, and the heat exchange module 14 and thus the heat medium heating device 10 can be made compact.

Further, a control board 17 on which a control circuit 21 including a heat-generating electrical component 20 such as a power transistor for controlling the PTC heater 13 is mounted on the heat exchange pressing member 15 is disposed. In addition, a heat penetration part 22 made of a high thermal conductivity material that is penetrated on both sides corresponding to the mounting position of the heat-generating electrical component 20 is provided, and the heat-generating electrical component 20 uses the heat exchanger pressing member 15 as a heat sink, It is mounted so as to be cooled via the heat penetration part 22. For this reason, the exothermic electrical component 20 surface-mounted on the control board 17 can be efficiently cooled via the heat penetration part 22 by using the heat exchanger pressing member 15 as a heat sink.
Therefore, it is possible to ensure the ease of assembly of the control board 17 and the reliability with respect to heat, omit the dedicated board storage box, the large heat medium distribution box, and the like, thereby reducing the size and weight of the heat medium heating device 10. Cost can be increased.

  Further, since the heat exchanger pressing member 15 is made of an aluminum alloy plate, the heat from the heat-generating electrical component 20 on the control board 17 passes through the heat penetration part 22 and has good thermal conductivity and is lightweight aluminum. The heat-generating electrical component 20 can be cooled by transferring heat to the heat exchanger pressing member 15 which is an alloy plate material and dissipating heat to the heat exchanger pressing member 15 using the flat heat exchanger tube 12 as a cooling source. Therefore, it is possible to improve the cooling performance of the heat-generating electrical component 20 that is surface-mounted on the control board 17 by using the heat exchanger pressing member 15 as a heat sink, and it is possible to improve heat reliability and maintain weight reduction. can do.

  In the present embodiment, since the spacer member 16 having a predetermined thickness made of a high thermal conductivity material is interposed between the heat exchanger pressing member 15 and the heat penetration portion 22 of the control board 17, the heat exchanger pressing member is provided. Even when it is necessary to secure a certain gap between the control board 17 on the member 15, a spacer member 16 having a predetermined thickness made of a high thermal conductivity material such as an aluminum alloy plate is used. By mounting, the heat exchanger pressing member 15 can function as a heat sink, and the heat-generating electrical component 20 surface-mounted on the control board 17 can be reliably cooled. Therefore, even in such a case, the cooling performance for the control board 17 can be improved, the reliability with respect to heat can be ensured, and the weight reduction can be maintained.

  In particular, on the control board 17, the exothermic electrical component 20 is disposed on the inlet header portion 12B side of the flat heat exchanger tube 12 on the heat medium inflow side of the heat medium heating device 10, and the heat exchanger pressing member 15 and Since the spacer member 16 made of a high thermal conductivity material is used as a heat sink and is cooled by a heat medium having a relatively low temperature before heating, the exothermic electrical component 20 is effectively cooled and the cooling is performed. The performance can be improved.

  Further, in the present embodiment, a plurality of terminal blocks 17B are arranged in parallel on one side of the surface side of the control board 17, and from one end of the electrode plate 24 provided on both surfaces of the PTC heater 13 with respect to the terminal block 17B. Since a plurality of extended terminals 24A can be directly connected, a control board 17 on which a control circuit 21 for controlling the PTC heater 13 is surface-mounted and an electrode plate provided on both sides of the PTC heater 13 24 to the terminal block 17B arranged in parallel on one side of the surface side of the control board 17, and the terminal 24A extended from one end of the electrode plate 24 is directly connected on the surface side of the control board 17 to be electrically connected. Can be connected. Therefore, the wiring work between the control board 17 and the electrode plate 24 can be facilitated and the assemblability can be improved, and the number of parts can be reduced by the harness-less, thereby simplifying the configuration and reducing the cost. .

  In addition, a plurality of flat heat exchanger tubes 12 and two sets of PTC heaters 13 are connected to each other through a heat medium inlet passage 11B and a heat medium outlet passage 11C that are communicated with the inlet header portion 12B and the outlet header portion 12C. Since it is configured to be fastened and fixed to the inner bottom surface of the casing 11 (lower case 11A) provided via the heat exchanger pressing member 15, a plurality of flat heat exchanger tubes 12 and a PTC heater 13 stacked on each other. Are fastened to the inner bottom surface of the casing 11 via the heat exchanger pressing member 15 so that they can be fixed in close contact with each other.

  Therefore, the flat heat exchanger tube 12 and the PTC heater 13 can be easily and reliably assembled in the assembly process, and the contact heat resistance between the flat heat exchanger tube 12 and the PTC heater 13 is reduced and transmitted. The thermal performance can be enhanced and the assemblability can be improved. Moreover, it is not always necessary to make the casing 11 made of an aluminum alloy material having heat resistance or heat conductivity, and it is possible to reduce the weight and cost by using a resin material.

  In particular, since the heat medium inlet path 11B for introducing the heat medium and the heat medium outlet path 11C for extracting the heat medium are integrally formed in the lower case 11A, when the heat medium is supplied to the heat medium heating apparatus 10, The stress applied to the laminated flat heat exchanger tubes 12 can be dispersed, and the load applied to the flat heat exchanger tubes 12 can be reduced.

  In addition, since the heat medium heated by the heat medium heating device 10 that is small and light and has high performance as described above can be supplied to the radiator 6 disposed in the air flow path 2, It is possible to improve the air conditioning performance, particularly the heating performance in the air conditioner 1, and improve the mountability of the air conditioner on the vehicle.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
This embodiment is different from the first embodiment described above in that the spacer member 16 is omitted. Since other points are the same as those in the first embodiment, description thereof will be omitted.
In the present embodiment, the screw 25 that fastens and fixes the heat exchanger pressing member 15 to the boss portion 11D of the lower case 11A does not interfere with the control substrate 17, and the control substrate 17 is disposed directly on the upper surface of the heat exchanger pressing member 15. The configuration is as follows. In addition, an upward convex surface portion 15A is formed at a position corresponding to the heat penetration portion 22 provided on the control board 17 side of the heat exchanger pressing member 15 in order to ensure contact with the heat penetration portion 22. It is desirable.

As described above, when the control board 17 is disposed on the heat exchanger pressing member 15, if there is no concern that the screw 25 for tightening and fixing the heat exchanger pressing member 15 interferes with the control board 17, the pair of spacer members 16 are attached. The control board 17 may be directly screwed on the heat exchanger pressing member 15 via the screw 26, and in this case, the heat penetration part 22 on the control board 17 side is also formed in the convex shape of the heat exchanger pressing member 15. The exothermic electrical component 20 can be efficiently cooled by contacting the surface portion 15A and using the heat exchanger pressing member 15 as a heat sink.
Therefore, also in this embodiment, the same effect as the first embodiment described above can be obtained.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, in the above-described embodiment, the flat heat exchanger tubes 12 are laminated in three layers, and the PTC heater 13 is incorporated between them. However, the present invention is not limited to this, and the flat heat exchanger tubes 12 and the PTC heaters 13 Of course, the number of stacked layers may be increased or decreased. Moreover, in the said embodiment, although the casing 11 is made from resin material, it cannot be overemphasized that this invention is not limited to this.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 6 Radiator 10 Heat carrier heating device 10A Heat carrier circulation circuit 11 Casing 11A Lower case 11B Heat carrier inlet passage 11C Heat carrier outlet passage 12 Flat heat exchanger tube 12A Flat tube portion 12B Inlet header portion 12C Outlet header portion 13 PTC heater 15 Heat exchange pressing member 16 Spacer member 17 Control board 17B Terminal block 20 Heat-generating electrical component (power transistor)
21 Control circuit 22 Thermal penetration part 24 Electrode plate 24A Terminal

Claims (6)

A plurality of flat heat exchanger tubes that flow out from the outlet header part after the heat medium flowing in from the inlet header part flows through the flat tube part,
A PTC heater incorporated between the flat tube portions of the plurality of flat heat exchanger tubes stacked on each other;
A heat exchanger presser member that presses the flat heat exchanger tubes and the PTC heaters stacked on each other from the one surface side of the flat heat exchanger tube toward the inner surface of the casing;
A control board disposed on the heat exchanger pressing member and surface-mounted with a control circuit including a heat-generating electrical component that controls the PTC heater, and
The control board is provided with a heat-penetrating portion made of a highly heat-conductive material that is penetrated on both sides corresponding to the mounting position of the heat-generating electrical component, and the heat-generating electrical component is provided with the heat exchanger pressing member. A heat medium heating device, wherein the heat medium is mounted as a heat sink so as to be cooled through the heat penetration portion.   2. The heat medium heating device according to claim 1, wherein the heat exchanger pressing member is an aluminum alloy plate.   The spacer member having a predetermined thickness made of a high thermal conductivity material is interposed between the heat exchanger pressing member and the heat penetration portion of the control board. Heat medium heating device.   A plurality of terminal blocks are arranged in parallel on one side of the surface side of the control board, and a plurality of terminals extended from one end of an electrode plate provided on both surfaces of the PTC heater with respect to the terminal block. 4. The heat medium heating device according to claim 1, wherein the heat medium heating device is directly connectable.   The flat heat exchanger tube and the PTC heater are disposed on the inner bottom surface of the casing having a heat medium inlet path and a heat medium outlet path communicating with the inlet header section and the outlet header section in a stacked state. The heat medium heating device according to any one of claims 1 to 4, wherein the heat medium holding device is fastened and fixed via the heat exchanger pressing member. In the vehicle air conditioner configured to circulate the heat medium heated by the heat medium heating device with respect to the radiator disposed in the air flow path,
The vehicle air conditioner, wherein the heat medium heating device is the heat medium heating device according to any one of claims 1 to 5.

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