JP2013075617A - Heating medium heating device and vehicular air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating medium heating device capable of reducing a pressure loss in a heating medium to improving performance, and a vehicular air conditioner.SOLUTION: The heating medium heating device 10 includes a plurality of flat heat exchange tubes 17 in each of which a heating medium introduced from an inlet header flows to be led out from an outlet header 22, a PTC heater 18 sandwiched in the laminated two flat heat exchange tubes 17, a casing 11 for storing the flat heat exchange tubes 17 and the PTC heater 18, a heating medium outlet passage 11d integrally formed with a lower case 11a of the casing 11 having a bending part 11h of bending in one direction from a connecting part with the lower case 11a and leading the heating medium to the outside from the outlet header 22, and a sealant 26cex installed in the connecting part between the lower case 11a and the heating medium outlet passage 11d and imparting a bending surface to the bending inside of the bending part 11h.

Description

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

The heat medium heating device is used, for example, in a vehicle air conditioner mounted on an electric vehicle or a hybrid vehicle, and heats a heat medium such as water using a PTC (Positive Temperature Coefficient) semiconductor. PTC semiconductors have the characteristic that the resistance value increases as the temperature rises, and when the temperature rises above a certain level, the resistance value suddenly changes and current can be limited. Can be constant.
Patent Documents 1 and 2 disclose techniques related to a heat medium heating device using a PTC element applicable to a vehicle air conditioner as a heating element.

JP 2008-7106 A JP 2008-56044 A

  A flow path through which the heat medium flows and a PTC semiconductor that heats the heat medium are stacked in the casing of the heat medium heating device, and a heat medium inlet path for introducing the heat medium into the flow path and a heat A heat medium outlet path for discharging the medium from the flow path to the outside is formed.

  The heat medium flowing through the flow path of the heat medium heating device and the heat medium inlet and outlet channels can circulate the heat medium more efficiently as the pressure loss is smaller. It is desirable to reduce as much as possible. On the other hand, when the casing of the heat medium heating device is made of a synthetic resin, a part that increases pressure loss may be generated inside the circulation path due to restrictions during molding such as a mold drawing direction.

  This invention is made in view of such a situation, Comprising: It aims at providing the heat medium heating apparatus and vehicle air conditioner which can reduce the pressure loss of a heat medium and can improve performance. And

In order to solve the above problems, the heat medium heating device and the vehicle air conditioner of the present invention employ the following means.
That is, the heat medium heating device according to the present invention includes a plurality of flat heat exchange tubes in which the heat medium introduced from the inlet header portion flows and led out from the outlet header portion, and two laminated heat exchange tubes. A PTC heater sandwiched between the casing, a casing for housing the heat exchanger tube and the PTC heater, a bent portion formed integrally with the casing and bent in one direction from a connection portion with the casing, and from the outlet header portion to the heat medium And a curved surface member that is attached to a connecting portion between the casing and the heat medium outlet channel, and that provides a curved surface on the bent inner side of the bent portion.

  According to the present invention, the heat medium flowing through the heat exchanger tube is heated by the PTC heater, led out from the outlet header portion, and then led out of the casing through the heat medium outlet passage. The heat medium outlet path is formed integrally with the casing and has a bent portion that is bent in one direction from a connection portion with the casing. And since the curved surface member is attached at the connecting portion between the casing and the heat medium outlet passage, and the curved surface is given to the inner side of the bent portion, the separation and disturbance of the flow of the heat medium from the tube wall are reduced. The pressure loss of the heat medium can be reduced.

  In the above invention, the curved surface member is installed so as to surround an opening formed at a connection portion between the casing and the heat medium outlet path, and is integrated with an annular sealing portion sandwiched between the heat exchange tube and the casing, and the sealing portion. And a curved portion including a curved cross section having a larger radius of curvature than the inside of the bent portion formed by the casing cross section.

  According to this invention, the sealing part can prevent the leakage of the heat medium from between the heat exchanger tube and the casing, and the curved part reduces the separation and turbulence of the flow of the heat medium from the tube wall, thereby reducing the heat. The pressure loss of the medium can be reduced. Since the sealing part and the bending part are integrally formed, the pressure loss can be reduced while ensuring the sealing performance without increasing the number of parts and without increasing the mounting effort. .

  In the above invention, the heat medium outlet channel may have an axial direction parallel to the bottom surface of the casing, and the bottom surface of the casing and the heat medium outlet channel may be formed of a common member.

  According to this invention, since the heat medium outlet passage extends in a direction parallel to the bottom surface of the casing and the bottom surface of the casing and the heat medium outlet passage are common, the height of the casing is suppressed. Further, the bent inner side of the bent portion is located on a member having a common bottom surface of the casing and the heat medium outlet path. Therefore, the flow direction of the heat medium led out from the outlet header portion in the casing is rapidly bent in the heat medium outlet path. With this configuration, the pressure loss of the heat medium can be reduced by providing the curved surface member.

  In addition, 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. In the heat medium heating device, the PTC sandwiched between a plurality of flat heat exchange tubes that are led out from the outlet header portion through which the heat medium introduced from the inlet header portion circulates and the two heat exchange tubes that are stacked. A heater, a casing that accommodates the heat exchanger tube and the PTC heater, and a bent portion that is formed integrally with the casing and is bent in one direction from a connection portion with the casing, and leads out the heat medium from the outlet header portion And a curved surface member that is attached to a connecting portion between the casing and the heat medium outlet channel and that gives a curved surface to the inside of the bent portion.

  According to the present invention, the heat medium circulated to the radiator disposed in the air flow path can be heated and circulated by the heat medium heating device having a small size and high performance. It is possible to improve the air conditioning performance, particularly the heating performance of the air conditioning apparatus for a vehicle, and to improve the mountability of the air conditioning apparatus on the vehicle.

  According to the present invention, the pressure loss of the heat medium can be reduced and the performance can be improved.

It is a schematic block diagram which shows the vehicle air conditioner provided with the heat medium heating apparatus which concerns on one Embodiment of this invention. It is a disassembled perspective view which shows the heat medium heating apparatus which concerns on the same embodiment. It is the longitudinal cross-sectional view cut | disconnected along the heat-medium inlet path of the heat-medium heating apparatus shown in FIG. It is the longitudinal cross-sectional view cut | disconnected along the heat-medium exit path of the heat-medium heating apparatus shown in FIG. FIG. 5 is a perspective view of only the lower case of the heat medium heating device shown in FIG. 4. FIG. 5 is a partially enlarged longitudinal sectional view showing a bent portion of the heat medium heating device shown in FIG. 4. It is a partial expansion perspective view which shows the bending part of the heat carrier heating apparatus shown in FIG. It is a perspective view which shows O-ring of the heat medium heating apparatus which concerns on the same embodiment.

Hereinafter, a heating medium heating device 10 according to an embodiment of the present invention will be described with reference to the drawings.
The vehicle air conditioner 1 is mounted on, for example, an electric vehicle or a hybrid vehicle, takes in outside air or air in the vehicle interior, adjusts the temperature, and then guides the temperature-controlled air to the vehicle interior. The vehicle air conditioner 1 includes a casing 3 that forms an air flow passage 2 as shown in FIG.
Inside the casing 3, a blower 4 that sucks and pressurizes outside air or vehicle interior air sequentially from the upstream side to the downstream side of the air flow passage 2, and pumps it to the downstream side, and is pumped by the blower 4. 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 through which the temperature-controlled air is blown out into the passenger compartment through a blowing 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. . Further, the radiator 6 constitutes a heat medium circulation circuit 10A together with the tank 8, the pump 9, and the heat medium heating device 10, and a heat medium (for example, antifreeze liquid, hot water, etc.) heated to a high temperature by the heat medium heating device 10 is used. By circulating through the pump 9, the air passing therethrough is heated.

2 to 4, the heat medium heating device 10 includes a control board 13, a plurality of electrode plates 14, and a plurality of semiconductor switching elements 12 such as IGBTs disposed on the control board 13. The heat exchanger pressing member 16, a plurality of (for example, three) flat heat exchanger tubes 17, a plurality of sets of PTC elements 18a, the control board 13, the electrode plate 14, the semiconductor switching element 12, and the flat heat exchanger A tube 17, a heat exchanger pressing member 16, a casing 11 that accommodates the PTC element 18 a and the like are provided.
A PTC heater 18 is constituted by the electrode plate 14, the PTC element 18a, an insulating member (not shown), and the like.

  The casing 11 is divided into an upper half and a lower half, and includes an upper case (not shown) that constitutes the upper half and a lower case 11a that constitutes the lower half. Inside the upper case and the lower case 11a, the upper case is placed on the opening 11b of the lower case 11a from above the lower case 11a, so that the control board 13, the semiconductor switching element 12, the electrode plate 14, and the heat exchanger pressing member are arranged. 16, a space for accommodating a plurality of flat heat exchanger tubes 17 and a plurality of sets of PTC heaters 18 is formed.

  On the bottom surface of the lower case 11a, a heat medium inlet channel 11c for guiding the heat medium introduced into the three laminated flat heat exchanger tubes 17 and a heat medium flowing through the flat heat exchanger tubes 17 are derived. The heat medium outlet passage 11d is integrally formed. The heat medium inlet path 11c and the heat medium outlet path 11d extend in parallel to each other in the same horizontal direction from the bottom surface of the lower case 11a, and project laterally from one end of the lower case 11a. The upper case and the lower case 11a are formed of a resin material (for example, PPS) having a linear expansion close to that of the aluminum alloy material constituting the flat heat exchanger tube 17 accommodated in the internal space. Thus, weight reduction can be attained by comprising the casing 11 with a resin material.

  In addition, the lower surface of the lower case 11a is provided with a power harness hole and an LV harness hole (both not shown) for penetrating the front end portions of the power harness and the LV harness. The power harness supplies power to the PTC heater 18 via the control board 13 and the semiconductor switching element 12. Further, the LV harness transmits a control signal to the control board 13.

  The semiconductor switching element 12 and the control board 13 constitute a control system that performs energization control for a plurality of sets of PTC heaters 18 based on a command from a host control device (ECU), and a plurality of semiconductor switching devices such as IGBTs. The energization state for the plurality of sets of PTC heaters 18 can be switched via the element 12. A plurality of flat heat exchanger tubes 17 are laminated so as to sandwich the plurality of sets of PTC heaters 18 from both sides.

  The flat heat exchanger tube 17 is a tube made of an aluminum alloy material. As shown in FIGS. 2 to 4, the flat heat exchanger tubes 17 in the lower, middle, and upper stages are arranged so that the three flat heat exchanger tubes 17 are parallel to each other. The heat exchange tubes 17c, 17b, and 17a are stacked in this order. As shown in FIGS. 2 to 4, these flat heat exchanger tubes 17 have an inlet header portion 21 and an outlet header portion 22 arranged in parallel at one end portion of the flat tube portion 20, and a heat medium flow at the other end portion. A U-turn channel 23 for U-turning is formed, and a U-turn flow path 24 is formed in the flat tube portion 20 from the inlet header portion 21 through the U-turn portion 23 to the outlet header portion 22.

  The flat heat exchanger tube 17 is formed by superposing a pair of thin molded plate members 25a and 25b made of an aluminum alloy material in which the flat tube portion 20, the inlet header portion 21, and the outlet header portion 22 are integrally formed, and brazed and joined. is there. The thickness direction dimension of the inlet header part 21 and the outlet header part 22 is made thicker than the thickness direction dimension of the flat tube part 20 which forms the U-turn flow path 24, and the three flat heat exchanger tubes 17a. , 17b, 17c, a gap having a predetermined dimension is formed between the flat tube portions 20. The PTC heater 18 sandwiched between the upper and lower electrode plates 14 and an insulator (not shown) is sandwiched in the gap, so that the three flat heat exchanger tubes 17 and the two sets of PTC heaters 18 are laminated in multiple layers. The

  Moreover, when each flat heat exchanger tube 17 is laminated | stacked, as FIG.3 and FIG.4 shows, inlet header parts 21 or outlet header parts 22 mutually adhere | attach each other, and inlet header part 21 and outlet header The communication holes 21a, 22a provided in the portion 22 are communicated with each other. At this time, each of the communication holes 21a and 22a is sealed by a sealing material 26 (in this example, an O-ring is used) such as an O-ring, a gasket, and a liquid gasket disposed around the communication holes 21a and 22a.

  The sealing material (O-ring) 26 is a synthetic resin member having elasticity, and is formed between the flat heat exchanger tube 17a and the inlet / outlet header portions 21 and 22 of the flat heat exchanger tube 17b, and between the flat heat exchanger tube 17b and the flat heat exchanger tube 17c. Between the inlet / outlet header portions 21 and 22 and between the inlet / outlet header portions 21 and 22 of the flat heat exchanger tube 17c and the inner bottom surface of the lower case 11a, the communication holes 21a on the side of the forming plate member 25b constituting the flat heat exchanger tubes 17b and 17c, It is installed in the area where the sealing material 26 is formed around 22a and on the inner bottom surface of the lower case 11a.

  Of the sealing material (O-ring) 26c, the sealing material (O-ring) 26cex on the outlet header portion 22 side is integrally provided with a curved portion 26d as shown in FIGS. 5 and 6, and is attached to the lower case 11a. The edge part 11f formed in the opening part 11e of the provided heat-medium exit channel | path 11d is made into a smooth curved surface.

  As shown in FIG. 8, the sealing material 26cex includes a sealing portion 26e and a curved portion 26d. By installing the seal member 26cex in the opening 11e of the lower case 11a, a curved surface (R surface) is given to the bent portion 11h of the heat medium outlet passage 11d and the edge portion 11f shown in FIGS.

An opening 11e for leading the heat medium from the outlet header portion 22 to the outside is formed on the bottom surface of the lower case 11a, and a heat medium outlet passage 11d is connected to the opening 11e of the lower case 11a. As a result, the heat medium is led out from the outlet header portion 22 via the opening 11e and the heat medium outlet passage 11d.
The opening 11e has a circular shape in accordance with the inner peripheral shape of the communication hole 22a of the outlet header 22.

  The heat medium outlet path 11d is divided into a tube portion 11g and a bent portion 11h, and the tube axis direction of the tube portion 11g is parallel to the bottom surface of the lower case 11a. The tube wall of the tube portion 11g and the bottom plate of the lower case 11a are shared from the edge portion 11f to the side wall of the lower case 11a. Thereby, the height of the casing 11 is suppressed. Further, the bent inner side of the bent portion 11h is located on a member where the bottom surface of the lower case 11a and the tube wall of the tube portion 11g are common. Therefore, the flow direction of the heat medium led out from the outlet header portion 22 in the casing 11 rapidly bends in the heat medium outlet path 11d. The bent portion 11h is a conduit that connects the opening 11e of the lower case 11a and the heat medium outlet passage 11d. In the present embodiment, the conduit of the bent portion 11h is bent by about 90 °.

  When forming a synthetic resin molded product in which the lower case 11a and the heat medium outlet path 11d are integrated, the molded product has a curved surface (on the edge portion 11f on the bent side of the bent portion 11h, taking into account the direction in which the mold is removed. R plane) cannot be formed. As a result, as shown in the cross-sectional views of FIGS. 4 and 6, the edge portion 11f on the bent side of the bent portion 11h must have an angle of about 90 ° (pin angle). Therefore, when the heat medium is circulated in this shape, the flow of the heat medium is peeled off or disturbed in the vicinity of the inner wall surface of the pipe part 11g from the edge part 11f toward the outlet due to the influence of the edge part 11f.

  The sealing portion 26e of the sealing material 26cex has a ring shape as a whole, and a longitudinal section thereof is, for example, a circular shape. The sealing portion 26e is installed around the opening 11e of the lower case 11a, and is fixed by being sandwiched between the bottom surface of the lower case 11a and the flat heat exchanger tube 17c. When the sealing material 26cex is installed in the opening 11e of the lower case 11a, the curved portion 26d is attached to the pipe portion 11g side.

  The curved portion 26d is a plate member formed integrally with the sealing portion 26e along the circumferential direction in a part of the sealing portion 26e, and has a curved surface that is curved from the inner peripheral side to the outer peripheral side of the sealing portion 26e. ing. The curved portion 26d is formed so that the radius of curvature of the arc portion obtained in the longitudinal section is larger than the radius of curvature of the corner portion of the edge portion 11f that is the inside of the bent portion 11h. The curved portion 26d is formed so that the central portion A is located on the sealing portion 26e side and the both end portions B are located away from the sealing portion 26e. The cross section including the line connecting the one end B, the center A and the other end B of the bending portion 26d has a curved shape along the circular shape of the tube portion 11g cross section.

As described above, since the curved portion 26d has a curved surface that is curved from the inner peripheral side toward the outer peripheral side, the pressure loss at the corner portion of the edge portion 11f when the heat medium passes through the heat medium outlet passage 11d. Can be reduced.
That is, in the bent portion 11h of the heat medium outlet passage 11d, if the edge portion 11f inside the bent portion has no curved surface and is a corner portion, or if the radius of curvature of the edge portion 11f is small, the edge portion 11f In the vicinity of the inner wall surface of the pipe portion 11g toward the outlet, the flow of the heat medium is peeled off or disturbed, resulting in a pressure loss of the heat medium. On the other hand, since the curved portion 26d is formed as in the present embodiment, the radius of curvature inside the bend increases, so that peeling that occurs near the inner wall surface of the tube portion 11g can be reduced, and the pressure of the heat medium Loss can also be reduced.

  In addition, the cross section including the line connecting the one end B, the center A, and the other end B of the curved portion 26d has a curved shape along the circular shape of the cross section of the tube portion 11g, so that the tube portion 11g A wide opening area can be secured. Therefore, it is possible to reduce the influence of pressure loss due to the installation of the sealing material 26cex.

  In addition, the inventors have a case where the sealing material 26cex having the curved portion 26d of the present embodiment is attached to the heat medium heating device 10, and a case where the sealing material 26 without the curved portion 26d is attached to the heat medium heating device 10. Then, the flow of the heat medium was numerically analyzed and simulated. As a result, when the sealing material 26cex having the curved portion 26d is installed, it seems that a pressure loss occurs because the pipeline is narrow at first glance, but compared to the case where the sealing material 26 without the curved portion 26d is installed, It was confirmed that the separation and turbulence of the flow of the heat medium can be reduced and the pressure loss is also reduced.

  Moreover, since the sealing part 26cex of this embodiment is integrally molded with the sealing part 26e and the curved part 26d, it can reduce pressure loss, without increasing the number of parts. In addition, the pressure loss can be reduced while maintaining the function of preventing leakage without increasing the labor for mounting the components.

Further, between the flat tube portions 20 of the three flat heat exchanger tubes 17, a plurality of sets of PTC heaters 18 are interposed via the electrode plate 14, an insulating sheet (not shown), etc., with respect to the gap between the tubes. Incorporated as described below.
As shown in FIGS. 3 and 4, the electrode plate 14 is for supplying power to the PTC element 18 a and is a plate made of aluminum alloy having a rectangular shape in plan view. One electrode plate 14 is laminated on both sides of the PTC element 18a so as to be in contact with the upper surface of the PTC element 18a and one electrode plate is in contact with the lower surface of the PTC element 18a. By these two electrode plates 14, the upper surface and the lower surface of the PTC element 18a are sandwiched from above and below.

  And the electrode plate 14 arrange | positioned at the upper surface side of the PTC element 18a is arrange | positioned so that the upper surface may contact the lower surface of the flat heat exchanger tube 17 via an insulating member, and the electrode arrange | positioned at the lower surface side of the PTC element 18a The plate 14 is disposed such that its lower surface is in contact with the upper surface of the flat heat exchanger tube 17 via an insulating member. In the present embodiment, the electrode plate 14 is provided between the lower flat heat exchanger tube 17c and the middle flat heat exchanger tube 17b, and between the middle flat heat exchanger tube 17b and the upper flat heat exchanger tube 17a. Two sheets, a total of four sheets, are disposed, and the PTC heaters 18 are stacked between the flat tube portions 20 of the three flat heat exchanger tubes 17 in a state of being sandwiched between these electrode plates 14.

  The substrate subassembly 15 is obtained by integrating the control substrate 13 and the heat exchanger pressing member 16 with an insulating sheet or the like interposed therebetween. The semiconductor switching element 12 such as an IGBT provided on the control board 13 is a heat generating component, and the heat generation is a heat penetration provided in the control board 13 corresponding to the installation portion of the semiconductor switching element 12. The heat is radiated to the heat exchanger pressing member 16 side through the section, and is cooled by the heat medium flowing through the flat heat exchanger tube 17.

  The heat exchanger pressing member 16 constituting the substrate subassembly 15 is a flat aluminum alloy plate material in plan view. As described above, the control board 13 is disposed on the upper surface of the heat exchanger pressing member 16. The heat exchanger pressing member 16 has a size capable of covering the flat tube portion 20 of each flat heat exchanger tube 17 and the upper surfaces of the inlet / outlet header portions 21 and 22.

  The substrate subassembly 15 is placed on the upper surface of the stacked upper flat heat exchanger tube 17a, and the lower surface of the heat exchanger pressing member 16 is connected to the flat tube portion 20 and the inlet / outlet header portions 21 and 22 of the upper flat heat exchanger tube 17a. It is arrange | positioned so that the upper surface of may be touched. The board subassembly 15 is formed by fixing the heat exchanger pressing member 16 to the lower case 11a with screws, thereby flattened heat exchanger tubes 17a stacked between the lower surface of the heat exchanger pressing member 16 and the inner bottom surface of the lower case 11a. , 17b and 17c and the two PTC heaters 18 sandwiched between them are pressed and brought into close contact with each other, and provided at the inlet / outlet headers 21 and 22 of the flat heat exchanger tubes 17, respectively. The sealing material (in this example, an O-ring) 26 disposed around the communicating holes 21a and 22a can be tightened and fixed.

  As a result, the heat medium flowing in from the heat medium inlet channel 11 c is introduced from the inlet header portion 21 of each flat heat exchanger tube 17 into the flat tube portion 20, and passes through the U-turn flow path 24 of the flat tube portion 20. While flowing, the PTC heater 18 heats and raises the temperature to reach the outlet header portion 22, and flows through the flow path from the outlet header portion 22 to the outside through the heat medium outlet passage 11 d. The heat medium flowing out 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 16 constituting the substrate subassembly 15 is made of an aluminum alloy material having good thermal conductivity, and its lower surface is in contact with the upper surface of the uppermost flat heat exchanger tube 17a. Thereby, the heat exchanger pressing member 16 uses the heat medium flowing in the flat heat exchanger tube 17 as a cold heat source as described above, and cools the semiconductor switching element 12 such as an IGBT installed on the control board 13. It also functions as a heat sink.

  As described above, 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.

  Each flat heat exchanger tube 17 is provided with an inlet header portion 21 and an outlet header portion 22 side by side on one end side, and the heat medium flowing in from the inlet header portion 21 is turned back at the U-turn portion 23 on the other end side. The flat heat exchanger tube 17 is provided with a U-turn flow path 24 that flows out of the air. For this reason, the tube length of the flat heat exchanger tube 17 can be shortened compared with the one using the flat heat exchanger tube of the both end tank structure which provided the inlet header part and the outlet header part at the both ends of the flat heat exchanger tube. Thus, the heat medium heating device 10 can be reduced in size and cost.

  Further, the sealing material 26cex provided in the opening 11e of the lower case 11a is formed with a curved portion 26d so that the radius of curvature on the inner side of the bend is increased, so that peeling that occurs in the vicinity of the inner wall surface of the tube portion 11g is reduced. The pressure loss of the heat medium can also be reduced. And since the sealing part 26cex of this embodiment is integrally molded with the sealing part 26e and the curved part 26d, it can reduce pressure loss, without increasing a number of parts. In addition, the pressure loss can be reduced while maintaining the function of preventing leakage without increasing the labor for mounting the components.

  Furthermore, by arranging the inlet header portion 21 and the outlet header portion 22 in parallel on one end side, the tube length can be shortened as described above, but the U-turn flow passage 24 is formed, resulting in a large flow pressure loss. However, it is possible to reduce flow path pressure loss at the outflow portion of the heat medium from the outlet header portion 22 and to reduce flow path pressure loss in the flat heat exchanger tube 17 as much as possible. Therefore, the heat medium heating device 10 can be miniaturized by making the most of the features of the flat heat exchanger tube 17 having the U-turn flow path 24, and the heat medium heating device can be reduced by reducing the pressure loss of the heat medium. 10 can be improved in performance.

  Further, since the heat medium inlet passage 11c and the heat medium outlet passage 11d are configured to extend from the casing 11 in the same direction, the heat medium circulation circuit 10A is connected to the heat medium heating device 10 from the same direction. Can be connected. Therefore, the routing of the heat medium circulation circuit 11A can be simplified and facilitated, and the mounting property of the heat medium heating device 10 on the vehicle can be improved.

  Further, according to the vehicle air conditioner 1 of the present embodiment, the heat medium circulated to the radiator 6 disposed in the air flow path 2 is reduced from the PTC heater 18 by reducing the pressure loss. By increasing the heat transfer efficiency to the heat exchanger, it can be heated and circulated by the heat medium heating device 10 which is reduced in size and performance. For this reason, while improving the air-conditioning performance in the vehicle air conditioner 1, especially heating performance, the mounting property of the air-conditioner 1 with respect to a vehicle can be improved.

  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 17 are stacked in three layers, and the PTC heater 18 is incorporated between them. However, the present invention is not limited to this, and the flat heat exchanger tubes 17 and the PTC heaters 18 Of course, the number of stacked layers may be increased or decreased. Moreover, although the example which used the casing 11 as the resin molded product was demonstrated, this invention is not limited to this, It is good also as metal products, such as an aluminum alloy.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 6 Radiator 10 Heat medium heating apparatus 10A Heat medium circulation circuit 11 Casing 11a Lower case 11b Opening part 11c Heat medium inlet path 11d Heat medium outlet path 11e Opening part 11f Edge part 11g Pipe part 11h Bending part 17, 17a , 17b, 17c Flat heat exchanger tube (heat exchanger tube)
18 PTC heater 21 Inlet header part 21a Communication hole 22 Outlet header part 22a Communication hole 23 U-turn part 24 U-turn flow path 26, 26a, 26b, 26c Sealing material 26cex Sealing material (curved surface member)
26d Bending part 26e Sealing part

Claims (4)

A plurality of flat heat exchanger tubes through which the heat medium introduced from the inlet header portion flows and is led out from the outlet header portion;
A PTC heater sandwiched between two laminated heat exchanger tubes;
A casing for housing the heat exchanger tube and the PTC heater;
A heat medium outlet passage formed integrally with the casing, having a bent portion bent in one direction from a connection portion with the casing, and leading the heat medium out from the outlet header portion;
A curved surface member attached to a connection portion between the casing and the heat medium outlet path, and providing a curved surface on the bent inner side of the bent portion;
A heating medium heating device comprising: The curved member is
An annular sealing portion that is installed so as to surround an opening formed in a connection portion between the casing and the heat medium outlet passage, and is sandwiched between the heat exchange tube and the casing;
A curved portion including a curved cross section formed integrally with the sealing portion and having a radius of curvature larger than the bent inner side of the bent portion formed by the casing cross section;
The heat medium heating device according to claim 1, wherein: The heat medium outlet path has an axial direction parallel to the bottom surface of the casing,
The heat medium heating device according to claim 1, wherein the bottom surface of the casing and the heat medium outlet passage are configured by a common 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 heat medium heating device includes:
A plurality of flat heat exchanger tubes through which the heat medium introduced from the inlet header portion flows and is led out from the outlet header portion;
A PTC heater sandwiched between two laminated heat exchanger tubes;
A casing for housing the heat exchanger tube and the PTC heater;
A heat medium outlet passage formed integrally with the casing, having a bent portion bent in one direction from a connection portion with the casing, and leading the heat medium out from the outlet header portion;
A curved surface member attached to a connection portion between the casing and the heat medium outlet path, and providing a curved surface on the bent inner side of the bent portion;
A vehicle air conditioner.

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