WO2021162069A1 - Heat medium heating device and vehicle air conditioning device - Google Patents

Heat medium heating device and vehicle air conditioning device Download PDF

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Publication number
WO2021162069A1
WO2021162069A1 PCT/JP2021/005145 JP2021005145W WO2021162069A1 WO 2021162069 A1 WO2021162069 A1 WO 2021162069A1 JP 2021005145 W JP2021005145 W JP 2021005145W WO 2021162069 A1 WO2021162069 A1 WO 2021162069A1
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WO
WIPO (PCT)
Prior art keywords
heating element
recess
heat medium
electrode
heating device
Prior art date
Application number
PCT/JP2021/005145
Other languages
French (fr)
Japanese (ja)
Inventor
足立　知康
Original Assignee
三菱重工サーマルシステムズ株式会社
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Filing date
Publication date
Application filed by 三菱重工サーマルシステムズ株式会社 filed Critical 三菱重工サーマルシステムズ株式会社
Publication of WO2021162069A1 publication Critical patent/WO2021162069A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic

Definitions

  • the present disclosure relates to a heat medium heating device and a vehicle air conditioner.
  • a positive characteristic thermistor element is used as a heat generating element as one of the heat medium heating devices for heating a heated medium which is a heat source for heating in a vehicle air conditioner applied to an electric vehicle or a hybrid vehicle.
  • a PTC heater is known (for example, Patent Document 1).
  • the PTC heater has a positive thermistor characteristic, and the resistance value rises as the temperature rises, thereby controlling the current consumption and slowing the temperature rise, and then the current consumption and the temperature of the heat generating part. Reaches the saturation region and stabilizes, and has self-temperature control characteristics.
  • Patent Document 1 describes an electric heating device having a heating element arranged in a recess provided in a housing.
  • the outside of the heating element is formed of ceramic plates, and the PTC heating element is arranged between these ceramic plates.
  • a contact plate made of a conductive material is arranged between these PTC heating elements and a ceramic plate, and an extension portion is integrally formed on these contact plates. Extensions of the contact plates facing each other are arranged on both sides in the diagonal direction. Therefore, the extensions are not only separated from each other by the thickness of the PTC heating element, but also substantially separated from each other by the width of the heating element.
  • contact plates for guiding electricity to the PTC heating element are arranged on both sides of the PTC heating element.
  • the distance between the contact plates arranged on either surface and the recesses becomes relatively short. Therefore, for example, when the concave portion (housing forming the concave portion) is formed of a conductive member, the insulation distance between the contact plate and the concave portion becomes short, so that there is a possibility of electric leakage from the contact plate to the concave portion. there were.
  • the present disclosure has been made in view of such circumstances, and provides a heat medium heating device and a vehicle air conditioner capable of improving insulation and suppressing electric leakage from an electrode portion.
  • the purpose is.
  • the heat medium heating device has a plate-shaped heating element and a recess for accommodating the heating element so that the plate surface and the side wall surface of the heating element face each other.
  • a heat radiating part that radiates heat to a heat medium and a pair of electrode parts fixed to the heating element are provided, and the heating element is unidirectional with reference to a central axis extending along the depth direction of the recess.
  • a pair of electrode portions are fixed to the plate surface of the heating element which is arranged on the side and is close to the central axis.
  • the insulating property can be improved and the electric leakage from the electrode portion can be suppressed.
  • FIG. 5 is a cross-sectional view showing a cross section taken along the line VV of FIG.
  • FIG. 5 is an enlarged cross-sectional view of a main part of FIG.
  • FIG. 5 is a perspective view which shows the heating apparatus provided in the heat medium heating apparatus of FIG.
  • FIG. 5 is a perspective view which shows the heating apparatus provided in the heat medium heating apparatus of FIG.
  • FIG. 5 is a top view which shows the heating apparatus provided in the heat medium heating apparatus of FIG.
  • the vehicle air conditioner 1 is a casing 3 that forms an air flow path 2 for taking in outside air or vehicle interior air, adjusting the temperature, and blowing it out into the vehicle interior. It has.
  • a blower 4 that sucks outside air or vehicle interior air in sequence from the upstream side to the downstream side of the air flow path 2 to boost the pressure and pumps it to the downstream side, and air pumped by the blower 4.
  • a cooler 5 that cools the flow
  • a radiator 6 that flows through the cooler 5 and heats the cooled air flow
  • an air flow rate that flows through the radiator 6 and air that flows by bypassing the radiator 6.
  • An air mix damper 7 for adjusting the ratio with the flow rate and adjusting the temperature of the air flow mixed on the downstream side thereof is installed.
  • the cooler 5 constitutes a refrigerant circuit together with a compressor, a condenser, and an expansion valve (not shown), and cools the air flowing thereby by evaporating the refrigerant adiabatically expanded by the expansion valve.
  • the radiator 6 constitutes a heat medium circulation circuit 11 together with a tank 8, a pump 9, and a heat medium heating device 10, and a heat medium (for example, water) heated by the heat medium heating device 10 is circulated via the pump 9. By doing so, the air circulating there is heated.
  • the longitudinal direction of the heat medium heating device 10 is the X-axis direction
  • the lateral direction of the heat medium heating device 10 is the Y-axis direction
  • the X-axis direction and the direction orthogonal to the Y-axis direction are the Z-axis.
  • the Z-axis direction may be referred to as the vertical direction.
  • the term "longitudinal direction” means the longitudinal direction of the heat medium heating device 10
  • the term “short direction” means the short direction of the heat medium heating device 10.
  • the heat medium heating device 10 is a device for heating a heat medium (for example, water).
  • the heat medium heating device 10 includes a first casing 20 in which various devices such as a control substrate 23 and a heating device 40 are housed, and a second casing 30 provided below the first casing 20 and through which a heat medium flows.
  • the heating device 40 for heating the heat medium is provided.
  • the first casing 20 integrally integrates a control board accommodating portion 21 in which the control substrate 23 is accommodated and a heat radiating portion 22 projecting downward from the bottom surface of the control substrate accommodating portion 21. Be prepared for.
  • the first casing 20 is a die-cast product integrally molded by die-casting using a metal material having high thermal conductivity such as an aluminum alloy.
  • the control board accommodating portion 21 is a box-shaped body with an open upper part, and a space for accommodating the control substrate 23 is formed inside. Further, a high-voltage connector 24 to which a high-voltage power cable (not shown) is connected is provided at one end of the control board accommodating portion 21 in the longitudinal direction (X-axis direction). Further, a low-voltage connector 25 to which a low-voltage power cable (not shown) is connected is provided at the other end of the control board accommodating portion 21 in the longitudinal direction. An opening extending in the longitudinal direction is formed on the bottom surface of the control board accommodating portion 21. The opening communicates with the recess 26 of the heat radiating portion 22, which will be described later.
  • the control board accommodating portion 21 may be closed above by providing a lid (not shown) or the like.
  • the control board 23 is for controlling the energization of the PTC heater (heating element) described later, and is fixedly installed in the control board accommodating portion 21 via a screw or the like.
  • the control board 23 is electrically connected to a high-voltage power cable (not shown) connected to the high-voltage connector 24 and a low-voltage cable (not shown) connected to the low-voltage connector 25. Further, the control board 23 is electrically connected to the PTC heater via an electrode plate 42 (electrode portion) described later.
  • the heat radiating portion 22 projects downward from the substantially central region of the bottom surface of the control board accommodating portion 21 in the lateral direction.
  • the heat radiating portion 22 integrally includes a recess 26 that is recessed downward from the bottom surface of the control board accommodating portion 21, and a plurality of heat radiating fins 27 that project substantially horizontally from the outer peripheral surface.
  • the recess 26 extends in the longitudinal direction of the heat medium heating device 10. As shown in FIG. 4, the recess 26 is provided with three partition walls 28 that divide the space inside the recess 26 in the longitudinal direction. That is, the recess 26 is divided into four by the partition wall 28. In the following description, the term "recess 26" simply means a divided recess 26.
  • the heating device 40 is housed in the space formed inside each recess 26. Note that, in FIG. 4, the control board 23 is omitted for the sake of illustration.
  • the recess 26 includes an inlet opening 26a that communicates with the internal space of the control board accommodating portion 21, and a side wall surface 26b that defines both ends of the space formed inside the recess 26 in the lateral direction. It has a bottom surface 26c that defines the lower end of the space formed inside the recess 26.
  • the first casing 20 is a die-cast product
  • a draft is formed on the side wall surface 26b of the recess 26. That is, the side wall surface 26b is inclined so as to form a predetermined angle with respect to the vertical surface. Specifically, each side wall surface 26b is inclined so that the side wall surfaces 26b come closer to each other from the entrance opening 26a toward the bottom surface 26c.
  • Each heat radiation fin 27 has a plate shape extending in the horizontal direction, and is formed over substantially the entire length direction.
  • the plurality of heat radiation fins 27 are arranged side by side at predetermined intervals in the vertical direction (Z-axis direction).
  • the second casing 30 integrally includes a flow path portion 31 that forms a flow path through which the heat medium flows, and a flange portion 32 that is fixed to the first casing 20. Further, as shown in FIGS. 2 and 3, the second casing 30 integrally integrates an inlet portion 33 for supplying the heat medium to the flow path portion 31 and an outlet portion 34 for discharging the heat medium from the flow path portion 31. Prepared for.
  • the flow path portion 31 extends in the longitudinal direction (X-axis direction). Inside the flow path portion 31, a flow path formed so as to be recessed downward is provided. The flow path extends in the longitudinal direction, and the heat medium flows through the flow path. Further, a heat radiating unit 22 is arranged in the flow path. The heat radiating portion 22 is arranged so as not to come into contact with the flow path portion 31. That is, the heat medium circulates in the space between the flow path portion 31 and the heat radiating portion 22. The heat medium is heated by exchanging heat with the heat radiating unit 22.
  • the flange portion 32 extends in the lateral direction from the upper end of the flow path portion 31.
  • the control board accommodating portion 21 of the second casing 30 is placed on the upper surface of the flange portion 32.
  • the flange portion 32 and the control board accommodating portion 21 are fixed.
  • An inlet portion 33 is provided at one end of the flow path portion 31 in the longitudinal direction (X-axis direction).
  • the inlet portion 33 is a cylindrical member.
  • a heat medium circulates inside the inlet 33.
  • the upper end of the inlet portion 33 is connected to the lower end of the flow path portion 31.
  • the heat medium flows into the flow path through the inlet 33.
  • An outlet portion 34 is provided at the other end of the flow path portion 31 in the longitudinal direction (X-axis direction).
  • the outlet portion 34 is a cylindrical member.
  • a heat medium circulates inside the outlet portion 34.
  • the upper end of the outlet portion 34 is connected to the lower end of the flow path portion 31. The heat medium that has passed through the flow path and has completed heat exchange is discharged to the outside of the heat medium heating device 10 via the outlet portion 34.
  • the heating device 40 is housed in the recess 26 of the heat radiating unit 22.
  • the resin frame 47 of the heating device 40 is omitted.
  • the heating device 40 includes a flat plate-shaped PTC element (heating element) 41, a pair of electrode plates (electrode portions) 42 fixed to the plate surface of the PTC element 41, and a PTC element.
  • the first insulator 43 and the second insulator 44 fixed to the plate surface of 41, the spacer 45 fixed to the first insulator 43, the leaf spring 46 fixed to the spacer 45, and the PTC element 41 are fixed. It is provided with a resin frame 47 and a resin frame 47.
  • the resin frame 47 is omitted for the sake of illustration. Further, in FIG. 12, only the PTC element 41 and the electrode plate 42 constituting the heating device 40 are shown.
  • the PTC element 41 is a member having a substantially quadrangular outer shape and a flat plate shape (see also FIG. 12). That is, the PTC element 41 has a plate surface on one side (hereinafter, referred to as "one surface 41a") and a plate surface on the other side (hereinafter, referred to as "other surface 41b"). Further, the PTC element 41 has a side surface 41c that connects one surface 41a and the other surface 41b.
  • high-voltage power supplied via the control board 23 is applied via the electrode plate 42.
  • the PTC element 41 is controlled on and off via a control board 23 and is configured to generate heat.
  • the pair of electrode plates 42 are fixed to one surface 41a of the PTC element 41. That is, each of the electrode plates 42 constituting the pair of electrode plates 42 is fixed to both ends of the PTC element 41 in the X-axis direction. Further, each electrode plate 42 is fixed to the same plate surface of the PTC element 41 (see also FIG. 12). That is, one of the pair of electrode plates 42 is provided at one end of one surface 41a of the PTC element 41, and the other of the pair of electrode plates 42 is provided at the other end of one surface 41a of the PTC element 41. Has been done.
  • Each electrode plate 42 is a plate-shaped member made of a conductive metal material. As shown in FIG. 12, each electrode plate 42 integrally has a fixing portion 42a fixed to one surface 41a of the PTC element 41 and a connecting portion 42b protruding upward from the fixing portion 42a.
  • the fixing portion 42a is in surface contact with one surface 41a of the PTC element 41.
  • the fixing portion 42a and the PTC element 41 are in surface contact with each other at the end portion of the PTC element 41 in the X-axis direction over substantially the entire area of the PTC element 41 in the Z-axis direction.
  • the fixing portion 42a and the PTC element 41 are fixed with a conductive adhesive at the contact portion.
  • the connecting portion 42b extends upward from the upper end of the fixing portion 42a.
  • the length of the connecting portion 42b in the X-axis direction is longer than the length of the fixing portion 42a in the X-axis direction.
  • the upper end of the connecting portion 42b is located above the inlet opening 26a of the recess 26 of the heat radiating portion 22. Further, the upper end of the connecting portion 42b penetrates the control board 23 located above the recess 26. At this penetration point, the connecting portion 42b and the control board 23 are electrically connected.
  • the first insulator 43 is a plate-shaped member made of a material having an insulating property (for example, aluminum oxide). As shown in FIGS. 9 and 11, the first insulator 43 has an element fixing portion 43a fixed to the PTC element 41 and an electrode fixing portion extending in the X-axis direction from both ends of the fixing portion 42a in the X-axis direction. It has a portion 43b integrally. That is, the element fixing portions 43a are provided in the central region of the first insulator 43 in the X-axis direction, and the electrode fixing portions 43b are provided at both ends of the first insulator 43 in the X-axis direction. The vertical length of the first insulator 43 is longer than the vertical length of the PTC element 41.
  • the element fixing portion 43a is formed so as to project from the electrode fixing portion 43b toward the PTC element 41 side.
  • the element fixing portion 43a is in surface contact with one surface 41a of the PTC element 41. Specifically, it is in contact with the central region of one surface 41a of the PTC element 41. Specifically, of the one surface 41a of the PTC element 41, the pair of electrode plates 42 are in contact with substantially the entire area where they are not fixed.
  • the first insulator 43 and the PTC element 41 are fixed with an adhesive having an insulating property at a contact portion.
  • the electrode fixing portion 43b is in surface contact with the fixing portion 42a of each electrode plate 42. Specifically, it is in surface contact with the surface of the electrode plate 42 that is not fixed to the PTC element 41.
  • the first insulator 43 and the electrode plate 42 are fixed with an adhesive having an insulating property at a contact portion.
  • the electrode fixing portion 43b is formed so as to be recessed from the element fixing portion 43a.
  • the length of the electrode fixing portion 43b in the X-axis direction is longer than the length of the electrode fixing portion 43b in the Y-axis direction.
  • the element fixing portion 43a On the surface of the first insulator 43 on the PTC element 41 side, the element fixing portion 43a is located on the PTC element 41 side by a predetermined distance from the electrode fixing portion 43b. This predetermined distance is substantially the same as or slightly longer than the thickness of the electrode plate 42.
  • the surface of the first insulator 43 opposite to the PTC element 41 side (hereinafter, referred to as “one surface”) is a flat surface over the entire area.
  • the second insulator 44 is made of an insulating material (for example, aluminum oxide) like the first insulator 43.
  • the second insulator 44 is a flat plate-shaped member.
  • the second insulator 44 is in surface contact with substantially the entire other surface 41b of the PTC element 41.
  • the second insulator 44 and the PTC element 41 are fixed with an adhesive having an insulating property at a contact portion.
  • the vertical length of the second insulator 44 is longer than the vertical length of the PTC element 41.
  • the spacer 45 is made of an insulating metal material (for example, an aluminum alloy). As shown in FIG. 10, the spacer 45 is a plate-shaped member formed so that the length in the Y-axis direction becomes shorter from the upper end to the lower end.
  • the spacer 45 has a substantially trapezoidal shape in a cross section cut at a surface intersecting the X-axis direction. As shown in FIG. 10, the spacer 45 is in surface contact with each other over substantially the entire surface of one surface of the first insulator 43.
  • the spacer 45 and the first insulator 43 are fixed with an adhesive having an insulating property at a contact portion.
  • facing surface 45a faces the side wall surface 26b of the recess 26.
  • the facing surface 45a is formed so that the angle formed by the facing surface 45a and the side wall surface 26b is smaller than the angle formed by the one surface 41a of the PTC element 41 and the side wall surface 26b of the recess 26. In other words, the facing surface is closer to parallel than the one surface 41a of the PTC element 41 with reference to the side wall surface 26b of the recess 26.
  • the spacer 45 is arranged so that the facing surface 45a is separated from the side wall surface 26b.
  • the leaf spring 46 is made of a metal material (for example, an aluminum alloy).
  • the leaf spring 46 is fixed to the facing surface of the spacer 45.
  • the leaf spring 46 has a main body portion 46a fixed to the spacer 45 and a plurality of plate-shaped spring portions 46b protruding from the main body portion 46a (six in this embodiment as an example).
  • the main body 46a is a plate-shaped member having a constant thickness, and is in surface contact with the facing surface of the spacer 45.
  • the leaf spring 46 and the spacer 45 are fixed with an adhesive having an insulating property at the contact portion.
  • the tip of the spring portion 46b is in contact with the side wall surface 26b of the recess 26.
  • the leaf spring 46 urges the spacer 45 toward the PTC element 41.
  • the leaf spring 46 urges the PTC element 41 or the like via the spacer 45 toward one direction (see FIG. 5) of the recess 26.
  • the resin frame 47 is made of an insulating resin.
  • the resin frame 47 is a rectangular frame-shaped member.
  • the resin frame 47 has a frame body portion 47a that forms a space inside, and a support portion 47b that extends from the frame body portion 47a in the Y-axis direction.
  • the PTC element 41 is arranged on the inner circumference of the frame body portion 47a. That is, the PTC element 41 is arranged in the space formed inside the frame body portion 47a.
  • the support portion 47b is arranged on the side surface of the first insulator 43, the second insulator 44, and the spacer 45.
  • the first insulator 43 and the second insulator 44 are fixed to the inner peripheral portion of the frame body portion 47a with an insulating adhesive.
  • the entire circumference of the first insulator 43 and the second insulator 44 is fixed to the frame body portion 47a.
  • the entire circumference of the first insulator 43 and the second insulator 44 may not be fixed to the frame portion 47a.
  • the upper surfaces of the first insulator 43 and the second insulator 44 may not be fixed to the frame portion 47a.
  • the heating device 40 As shown in FIG. 5, in the heating device 40, one surface 41a and the other surface 41b of the PTC element 41 are housed in the recess 26 so as to face the side wall surface 26b of the recess 26. Further, the heating device 40 is arranged in the recess 26 so as to be closer to one direction with respect to the central axis C extending along the depth direction (Z-axis direction) of the recess 26. Specifically, the heating device 40 is arranged so as to be in contact with the side wall surface 26b on the one-way side of the recess 26 and away from the side wall surface 26b on the other direction side of the recess 26 (see FIG. 6). By arranging the heating device 40 in this way, the PTC element 41 is arranged so that the one surface 41a to which the electrode plate 42 is fixed is closer to the central axis than the other surface 41b.
  • the separation distance between the heating device 40 and the recess 26 becomes wider toward the lower side. That is, the distance between the main body portion 46a of the leaf spring 46 and the side wall surface 26b of the recess 26 is larger than the distance (L1 in FIG. 6) of the recess 26 on the inlet opening 26a side (upper side in this embodiment) of the recess 26. The distance (L2 in FIG. 6) on the bottom surface 26c side (lower side in this embodiment) is longer.
  • the plate thickness of the main body portion 46a is constant, so in other words, the distance between the facing surface 45a of the spacer 45 and the side wall surface 26b of the recess 26 is greater than the distance between the inlet opening 26a side of the recess 26 and the bottom surface of the recess 26.
  • the 26c side is longer.
  • a potting agent (filler) 48 is filled between the heating device 40 and the side wall surface 26b of the recess 26. Specifically, the potting agent 48 is filled between the leaf spring 46 and the side wall surface 26b.
  • the potting agent 48 is, for example, a silicone-based resin material having a higher thermal conductivity than air.
  • the silicone-based resin material is an example, and other materials may be used as the potting agent 48.
  • a material that is a low-viscosity liquid at room temperature and becomes an elastic body having a predetermined elasticity by heating is used.
  • a silicone rubber whose curing method is classified as two-component addition can be used.
  • the potting agent 48 may be filled by accommodating the heating device 40 in the recess 26 and then injecting the potting agent 48 between the heating device 40 and the recess 26. Further, the potting agent 48 may be filled by injecting the filler into the recess 26 and then accommodating the heating device 40 in the recess 26.
  • grease may be applied to the surface in contact with the recess 26 (the plate surface of the second insulator 44). By applying grease, the friction between the heating device 40 and the recess 26 is reduced, and the heating device 40 can be easily accommodated in the recess 26. Further, the potting agent 48 is heated after filling to become an elastic body.
  • the main body 46a of the leaf spring 46 of the heating device 40 and the recess 26 are separated from each other. As a result, when the heating device 40 is housed in the recess 26, the load acting on the PTC element 41 from the recess 26 is suppressed. Therefore, damage to the PTC element 41 can be suppressed.
  • a potting agent 48 having a higher thermal conductivity than air is filled between the heating device 40 and the side wall surface 26b of the recess 26.
  • the potting agent 48 is filled between the heating device 40 and the side wall surface 26b of the recess 26. Further, the potting agent 48 is heated after filling to form an elastic body.
  • an elastic body is provided between the heating device 40 and the recess 26. For example, when the heating device 40 and the recess 26 are in contact with each other on substantially the entire surface of non-elastic solids, thermal stress may occur and the heating device 40 may be damaged.
  • an elastic body is provided between the heating device 40 and the recess 26. Therefore, damage to the heating device 40 can be suppressed.
  • the spacer 45 has a facing surface 45a facing the side wall surface 26b, and is formed so that the angle formed by the facing surface 45a and the side wall surface 26b is smaller than the angle formed by the plate surface and the side wall surface 26b.
  • the facing surface 45a of the spacer 45 is closer to parallel than the plate surface of the PTC element 41 with reference to the side wall surface 26b of the recess 26. Therefore, the distance between the facing surface 45a and the side wall surface 26b is made uniform in the depth direction (Z-axis direction) of the recess 26.
  • the thickness (length in the Y-axis direction) of the filler filled between the facing surface 45a and the side wall surface 26b is also made uniform. Therefore, the amount of heat transferred from the PTC element 41 to the heat radiating portion 22 can be made uniform in the depth direction of the recess 26.
  • the heating device 40 is arranged closer to one direction in the recess 26 by the leaf spring 46.
  • the distance between the heating device 40 and the side wall surface 26b of the recess 26 can be increased as compared with the case where the heating device 40 is arranged at the center of the recess 26. Therefore, the potting agent 48 can be easily filled.
  • the PTC element 41, the electrode plate 42, the first insulator 43, the second insulator 44, and the spacer 45 are fixed with an adhesive. Further, the first insulator 43 and the second insulator 44 are fixed to the resin frame 47. As a result, the PTC element 41, the spacer 45, and the resin frame 47 can be easily accommodated in the recess 26 as compared with the case where the PTC element 41, the spacer 45, and the resin frame 47 are not integrated. Further, the PTC element 41 is surrounded by a resin frame 47 formed of an insulating member. As a result, the electrode plate 42 and the heat radiating portion 22 can be insulated by the resin frame 47.
  • the insulating property can be improved and the electric leakage from the electrode plate 42 can be suppressed. Further, the entire circumference of the first insulator 43 and the second insulator 44 is fixed to the resin frame 47 with an insulating adhesive. As a result, it is possible to prevent the potting agent 48 from adhering to the side surface 41c of the PTC element 41, and the potting agent 48 having a low heat resistant temperature can be used.
  • both of the pair of electrode plates 42 are fixed to one surface 41a, which is the plate surface of the PTC element 41 on the side closer to the central axis C.
  • the electrode plate 42 can be provided at a position close to the central axis C of the recess 26.
  • the electrode plate 42 can be provided at a position far from the side wall surface 26b of the recess 26. Therefore, the insulation distance between the electrode plate 42 and the heat radiating portion 22 can be increased as compared with the case where the electrode plate 42 is fixed to the plate surface (other surface 41b) far from the central axis C. Therefore, the insulating property can be improved and the electric leakage from the electrode plate 42 can be suppressed.
  • the central axis C means a line passing through the center of the recess 26 when viewed in the YZ plane.
  • the electrode plate 42 is arranged at one end of one surface 41a of the PTC element 41 and the other end of the PTC element 41. As a result, the distance between the electrode plates 42 can be increased. That is, the insulation distance between the electrode plates 42 can be increased. Thereby, the withstand voltage can be improved.
  • one electrode of the pair of electrode plates 42 is provided on one surface 41a of the PTC element 41, the other electrode plate 42 is provided on the other surface 41b of the PTC element 41, and one electrode plate 42 and the other electrode plate 42 are provided. It is also conceivable to provide and at positions that are both ends when the plate surface is viewed in a plan view. That is, it is conceivable that one electrode plate 42 and the other electrode plate 42 are provided so as to be diagonal to the PTC element 41 with the PTC element 41 interposed therebetween. In this embodiment, the conductor is conducted by a pair of electrode plates 42 provided at both ends of one surface 41a of the PTC element 41.
  • the insulation distance between one electrode plate 42 and the other electrode plate 42 becomes long, so that the withstand voltage can be improved.
  • the electrode plates 42 may not conduct with each other and the PTC element 41 may not generate heat.
  • damage to the PTC element 41 is suppressed, so that both improvement in electric resistance and improvement in reliability of the PTC element 41 can be achieved at the same time.
  • the distance between the facing surface 45a of the spacer 45 and the side wall surface 26b of the recess 26 is longer on the bottom surface 26c side of the recess 26 than on the inlet opening 26a side of the recess 26.
  • the potting agent 48 can be preferably filled. Even when the heating device 40 is housed in the recess 26 and then filled with the potting agent 48, or when the potting agent 48 is injected into the recess 26 and then the heating device 40 is housed in the recess 26. , Air can be suitably discharged from the inlet opening 26a. Therefore, the potting agent 48 can be suitably filled.
  • the first insulator 43 and the second insulator 44 are provided between the electrode plate 42 and the side wall surface 26b of the recess 26.
  • the electrode plate 42 and the heat radiating portion 22 can be insulated by the first insulator 43 and the second insulator 44. Therefore, it is possible to suppress electric leakage from the electrode plate 42.
  • the PTC element 41 and the electrode plate 42 are fixed with an adhesive.
  • electricity can be suitably applied between the electrode and the PTC element 41.
  • the first insulator 43, the electrode plate 42, and the PTC element 41 are fixed with an insulating adhesive.
  • the electrode plate 42 or the PTC element 41 and the insulator can be fixed with an adhesive. Therefore, a short circuit between the electrode plates 42 can be suppressed.
  • the PTC element 41, the electrode plate 42, the first insulator 43, the second insulator 44, and the spacer 45 constituting the heating device 40 are fixed with an adhesive. This makes it possible to eliminate air between the members. Therefore, since the thermal resistance between the members is reduced, heat can be suitably transferred from the PTC element 41 to the heat radiating unit 22.
  • the present disclosure is not limited to the above embodiment, and can be appropriately modified without departing from the gist thereof.
  • a pair of electrode plates 42 are provided on one surface 41a of the PTC element 41
  • the present disclosure is not limited to this.
  • one of the pair of electrode plates 42 is provided on one side surface 41c of the PTC element 41 in the X-axis direction
  • the other of the pair of electrode plates 42 is provided on the other side surface 41c of the PTC element 41 in the X-axis direction. It may be provided.
  • the insulation distance between the electrode plate 42 and the heat radiating portion 22 is longer than in the case where the electrode plate 42 is fixed to the plate surface (other surface 41b) far from the central axis C. Can be done. Therefore, the insulating property can be improved and the electric leakage from the electrode plate 42 can be suppressed.
  • the heating device 40 may be configured by omitting the leaf spring 46.
  • the heating device 40 when the heating device 40 is housed in the recess 26, it is housed so as to be closer to one direction of the recess 26.
  • the insulation distance between the electrode plate 42 and the heat radiating portion 22 is longer than in the case where the electrode plate 42 is fixed to the plate surface (other surface 41b) far from the central axis C. Can be done. Therefore, the insulating property can be improved and the electric leakage from the electrode plate 42 can be suppressed.
  • the electrode plate 42 may be fixed to the plate surface of the PTC element 41 opposite to the plate surface on which the spacer 45 is provided. By doing so, the electrode plate 42 can be kept away from the conductive member. Therefore, the insulating property can be improved and the electric leakage from the electrode plate 42 can be suppressed.
  • the heating device 40 may be arranged so that both sides of the heating device 40 are separated from the side wall surface 26b of the recess 26, and the potting agent 48 may be filled on both sides of the heating device 40.
  • the low voltage cable may be a low voltage connector.
  • the high-voltage connector and the low-voltage connector may be provided at the same end in the longitudinal direction.
  • the electrode plate may have the same length in the Y-axis direction of the fixing portion 42a and the electrode fixing portion 43b.
  • the first insulator 43 may be separated at a step position in the Y-axis direction. That is, the flat plate-shaped spacer-side insulator fixed to the spacer 45 and the flat-plate-shaped PTC element-side insulator fixed to the PTC element 41 are configured as separate bodies, and the center of the plate surface of the spacer-side insulator is formed.
  • the plate surface of the insulator on the PTC element side may be fixed to the portion. At that time, the insulator on the spacer side and the insulator on the PTC element side may be fixed with an insulating adhesive.
  • a leaf spring may be provided between the first insulator 43 and the spacer 45.
  • the leaf spring may be fixed to the first insulator 43 with an adhesive having an insulating property.
  • the tip of the spring portion of the leaf spring is in contact with the spacer 45, and the leaf spring urges the first insulator 43 toward the PTC element 41.
  • the potting agent may be filled between the spacer 45 and the leaf spring.
  • a leaf spring may be provided between the second insulator 44 and the side wall surface 26b of the recess 26.
  • the leaf spring may be fixed to the second insulator 44 with an adhesive having an insulating property.
  • the tip of the spring portion of the leaf spring is in contact with the side wall surface 26b of the recess 26.
  • a spacer may be provided between the leaf spring and the side wall surface 26b, and when the spacer is provided, the tip of the spring portion of the leaf spring is in contact with the spacer.
  • the leaf spring urges the second insulator 44 in the direction of the PTC element 41.
  • the potting agent 48 may be filled between the leaf spring 46 and the side wall surface 26b or the spacer.
  • the heating medium heating device accommodates the heating element so that the plate-shaped heating element (41) and the plate surface (41a) and the side wall surface (26b) of the heating element face each other.
  • the heating element is provided with a heat radiating portion (22) that has a recess (26) to dissipate heat from the heating element to a heating medium, and a pair of electrode portions (42) fixed to the heating element.
  • a pair of the electrode portions are fixed to the plate surface of the heating element which is arranged in one direction with reference to the central axis (C) extending along the depth direction of the recess and is closer to the central axis. Has been done.
  • both of the pair of electrode portions are fixed to the plate surface of the heating element on the side closer to the central axis.
  • the electrode portion can be provided at a position close to the central axis of the recess.
  • the electrode portion can be provided at a position far from the side wall surface of the recess. Therefore, for example, even if the heat radiating portion is a conductive member, the insulation distance between the electrode portion and the heat radiating portion can be lengthened as compared with the case where the electrode portion is fixed to the plate surface on the side far from the central axis. can. Therefore, the insulating property can be improved and the electric leakage from the electrode portion can be suppressed.
  • the central axis means a line passing through the center of the recess when viewed on the YZ plane.
  • one of the pair of the electrode portions is provided at one end of the plate surface of the heating element, and the other of the pair of the electrode portions is provided. , Is provided at the other end of the plate surface of the heating element.
  • the electrode portions are arranged at one end of the plate surface of the heating element and the other end. As a result, the distance between the electrode portions can be increased. That is, the distance between the electrode portions can be increased. Thereby, the withstand voltage can be improved.
  • the heating element (41) and the heating element such that the plate surface (41a) and the side wall surface (26b) of the heating element face each other.
  • a heat radiating portion (22) that has a recess (26) for accommodating the heating element and radiates heat of the heating element to a heating medium, and a pair of electrode portions (42) fixed to the heating element.
  • the body is arranged unidirectionally with reference to a central axis extending along the depth direction of the recess, and one of the pair of electrode portions is provided on one side surface (26c) of the heating element.
  • the other side of the pair of electrode portions is provided on the other side surface (26c) of the heating element.
  • the heating element is arranged in one direction with respect to the central axis. That is, the plate surface of the heating element includes a surface on the side close to the central axis and a surface on the side far from the central axis. Further, in the above configuration, both of the pair of electrode portions are fixed to the side surface of the heating element. As a result, the electrode portion can be provided at a position closer to the central axis of the recess as compared with the case where the electrode portion is fixed to the plate surface on the side far from the central axis. In other words, the electrode portion can be provided at a position far from the side wall surface of the recess.
  • the insulation distance between the electrode portion and the heat radiating portion can be lengthened as compared with the case where the electrode portion is fixed to the plate surface on the side far from the central axis. can. Therefore, the insulating property can be improved and the electric leakage from the electrode portion can be suppressed.
  • the electrode portions are arranged on the side surface of the plate surface of the heating element and the side surface on the other side. As a result, the distance between the electrode portions can be increased. That is, the distance between the electrode portions can be increased. Thereby, the withstand voltage can be improved.
  • the heating element and the electrode portion are fixed with a conductive adhesive.
  • the heating element and the electrode are fixed with an adhesive.
  • electricity can be suitably applied between the electrode and the heating element.
  • the heat medium heating device includes an insulator provided between the electrode portion and the side wall surface and fixed to at least one of the electrode portion or the heating element.
  • the electrode portion or the heating element and the insulator are fixed with an insulating adhesive.
  • an insulator is provided between the electrode portion and the side wall surface.
  • the electrode portion and the heat radiating portion can be insulated by an insulator. Therefore, it is possible to suppress electric leakage from the electrode portion.
  • the electrode portion or the heating element and the insulator are fixed with an insulating adhesive. This makes it possible to suppress electric leakage from the electrode portion.
  • an adhesive is provided between the electrode portion or the heating element and the insulator. This makes it possible to eliminate air between the heating element and the electrodes. Therefore, the thermal resistance between the members is reduced. Therefore, heat can be suitably transferred from the heating element to the heat radiating portion via the insulator.
  • the vehicle air conditioner includes the heat medium heating device (10), the air flow path (2), and the outside air or the vehicle interior air in the air flow path according to any one of the above.
  • a vehicle air conditioner including a blower (4) for circulation, a cooler (5) provided on the downstream side of the blower, and a radiator (6) provided on the downstream side of the cooler.
  • the heat medium heated by the heat medium heating device is configured to be circulatory.
  • Heat medium heating device 11 Heat medium circulation circuit 20: 1st casing 21: Control board accommodating part 22: Heat dissipation part 23: Control board 24: High pressure connector 25: Low pressure connector 26: Recess 26a: Inlet opening 26b: Side wall surface 26c: Bottom surface 27: Heat dissipation fin 28: Partition 30: Second Casing 31: Flow path 32: Flange 33: Inlet 34: Outlet 40: Heating device 41: PTC element (heating element) 41a: One surface 41b: Other surface 41c: Side surface 42: Electrode plate (electrode portion) 42a: Fixing part 42b: Connecting part 43: First insulator 43a: Element fixing part 43b: Electrode fixing part 44: Second insulator 45: Spacer 45a: Facing surface 46: Leaf spring 46a: Main body part 46b: Spring part 47 : Resin frame

Abstract

The purpose of the present invention is to improve insulation quality and prevent electric leakage from an electrode part. A heat medium heating device (10) includes: a plate-shaped PTC element (41); a heat dissipation part (22) that has a recess (26) storing the PTC element (41) such that one surface of the PTC element (41) and a side wall surface (26b) face each other, and that dissipates heat of the PTC element (41) to a heat medium; and a pair of electrodes plates (42) fixed to the PTC element (41). The PTC element (41) is disposed on one direction side with respect to a central axis (C) extending along a depth direction of the recess (26). The pair of electrode plates (42) are fixed to one surface of the PTC element (41) on a side nearer to the central axis (C).

Description

熱媒体加熱装置及び車両用空調装置Heat medium heating device and vehicle air conditioner
　本開示は、熱媒体加熱装置及び車両用空調装置に関するものである。 The present disclosure relates to a heat medium heating device and a vehicle air conditioner.
　電気自動車やハイブリッド車等に適用される車両用空調装置にあって、暖房用の熱源となる被加熱媒体を加熱する熱媒体加熱装置の１つとして、正特性サーミスタ素子（ＰＴＣ素子）を発熱要素とするＰＴＣヒータを用いたものが知られている（例えば、特許文献１）。
　ＰＴＣヒータは、正特性のサーミスタ特性を有しており、温度の上昇と共に抵抗値が上昇し、これによって消費電流が制御されるとともに温度上昇が緩やかになり、その後、消費電流および発熱部の温度が飽和領域に達して安定するものであり、自己温度制御特性を備えている。 A positive characteristic thermistor element (PTC element) is used as a heat generating element as one of the heat medium heating devices for heating a heated medium which is a heat source for heating in a vehicle air conditioner applied to an electric vehicle or a hybrid vehicle. A PTC heater is known (for example, Patent Document 1).
The PTC heater has a positive thermistor characteristic, and the resistance value rises as the temperature rises, thereby controlling the current consumption and slowing the temperature rise, and then the current consumption and the temperature of the heat generating part. Reaches the saturation region and stabilizes, and has self-temperature control characteristics.
　特許文献１には、ハウジングに設けられた凹部内に配置される加熱素子を有する電気加熱装置が記載されている。この加熱素子の外側はセラミック板により形成され、ＰＴＣ加熱素子がこれらのセラミック板の間に配列されている。また、導電性材料で作られた接触板がこれらのＰＴＣ加熱素子とセラミック板の間に配置され、延長部がこれらの接触板の上に一体的に形成される。互いに対向する接触板の延長部は、対角方向の両側に配置されている。したがって、延長部は、ＰＴＣ加熱素子の厚さにより互いに離間されるだけでなく、さらに実質的に加熱素子の幅だけ互いに離間されている。 Patent Document 1 describes an electric heating device having a heating element arranged in a recess provided in a housing. The outside of the heating element is formed of ceramic plates, and the PTC heating element is arranged between these ceramic plates. Further, a contact plate made of a conductive material is arranged between these PTC heating elements and a ceramic plate, and an extension portion is integrally formed on these contact plates. Extensions of the contact plates facing each other are arranged on both sides in the diagonal direction. Therefore, the extensions are not only separated from each other by the thickness of the PTC heating element, but also substantially separated from each other by the width of the heating element.
特開２００８－７１０６号公報Japanese Unexamined Patent Publication No. 2008-7106
　しかしながら、特許文献１に記載の装置では、ＰＴＣ加熱素子に電気を導くための接触板が、ＰＴＣ加熱素子の両面に配置されている。このように、ＰＴＣ加熱素子の両面に接触板を配置すると、いずれかの面に配置された接触板は、凹部との距離が比較的短くなる。したがって、例えば、凹部（凹部を形成するハウジング）が導電性の部材で形成されている場合には、接触板と凹部との絶縁距離が短くなるため、接触板からの凹部へ漏電する可能性があった。 However, in the apparatus described in Patent Document 1, contact plates for guiding electricity to the PTC heating element are arranged on both sides of the PTC heating element. When the contact plates are arranged on both sides of the PTC heating element in this way, the distance between the contact plates arranged on either surface and the recesses becomes relatively short. Therefore, for example, when the concave portion (housing forming the concave portion) is formed of a conductive member, the insulation distance between the contact plate and the concave portion becomes short, so that there is a possibility of electric leakage from the contact plate to the concave portion. there were.
　本開示は、このような事情に鑑みてなされたものであって、絶縁性を向上させることができ、電極部からの漏電を抑制することができる熱媒体加熱装置及び車両用空調装置を提供することを目的とする。 The present disclosure has been made in view of such circumstances, and provides a heat medium heating device and a vehicle air conditioner capable of improving insulation and suppressing electric leakage from an electrode portion. The purpose is.
　上記課題を解決するために、本開示の熱媒体加熱装置及び車両用空調装置は以下の手段を採用する。
　本開示の一態様に係る熱媒体加熱装置は、板状の発熱体と、前記発熱体の板面と側壁面とが対向するように前記発熱体を収容する凹部を有し、前記発熱体の熱を熱媒体へ放熱する放熱部と、前記発熱体に固定される一対の電極部と、を備え、前記発熱体は、前記凹部の深さ方向に沿って延びる中心軸線を基準として、一方向側に配置され、前記中心軸線に近い側の前記発熱体の板面には、一対の電極部が固定されていている。 In order to solve the above problems, the heat medium heating device and the vehicle air conditioner of the present disclosure employ the following means.
The heat medium heating device according to one aspect of the present disclosure has a plate-shaped heating element and a recess for accommodating the heating element so that the plate surface and the side wall surface of the heating element face each other. A heat radiating part that radiates heat to a heat medium and a pair of electrode parts fixed to the heating element are provided, and the heating element is unidirectional with reference to a central axis extending along the depth direction of the recess. A pair of electrode portions are fixed to the plate surface of the heating element which is arranged on the side and is close to the central axis.
　本開示によれば、絶縁性を向上させることができ、電極部からの漏電を抑制することができる。 According to the present disclosure, the insulating property can be improved and the electric leakage from the electrode portion can be suppressed.
本開示の実施形態に係る車両用空調装置の全体構成図である。It is an overall block diagram of the vehicle air conditioner which concerns on embodiment of this disclosure. 本開示の実施形態に係る熱媒体加熱装置を示す斜視図である。It is a perspective view which shows the heat medium heating apparatus which concerns on embodiment of this disclosure. 図２の熱媒体加熱装置を示す側面図である。It is a side view which shows the heat medium heating apparatus of FIG. 図２の熱媒体加熱装置を示す平面図である。It is a top view which shows the heat medium heating apparatus of FIG. 図２のＶ－Ｖ矢視断面を示す断面図である。FIG. 5 is a cross-sectional view showing a cross section taken along the line VV of FIG. 図５の要部を拡大した断面図である。FIG. 5 is an enlarged cross-sectional view of a main part of FIG. 図２の熱媒体加熱装置に設けられる加熱装置を示す斜視図である。It is a perspective view which shows the heating apparatus provided in the heat medium heating apparatus of FIG. 図２の熱媒体加熱装置に設けられる加熱装置を示す斜視図である。It is a perspective view which shows the heating apparatus provided in the heat medium heating apparatus of FIG. 図２の熱媒体加熱装置に設けられる加熱装置を示す平面図である。It is a top view which shows the heating apparatus provided in the heat medium heating apparatus of FIG. 図２の熱媒体加熱装置に設けられる加熱装置の要部を示す側面図である。It is a side view which shows the main part of the heating apparatus provided in the heat medium heating apparatus of FIG. 図２の熱媒体加熱装置に設けられる加熱装置の要部を示す平面図である。It is a top view which shows the main part of the heating apparatus provided in the heat medium heating apparatus of FIG. 図２の熱媒体加熱装置に設けられる加熱装置の要部を示す斜視図である。It is a perspective view which shows the main part of the heating apparatus provided in the heat medium heating apparatus of FIG.
　以下に、本開示に係る熱媒体加熱装置及び車両用空調装置の一実施形態について、図面を参照して説明する。 Hereinafter, an embodiment of the heat medium heating device and the vehicle air conditioner according to the present disclosure will be described with reference to the drawings.
　本実施形態に係る車両用空調装置１は、図１に示すように、外気または車室内空気を取り込んで温調し、それを車室内へと吹出すための空気流路２を形成するケーシング３を備えている。 As shown in FIG. 1, the vehicle air conditioner 1 according to the present embodiment is a casing 3 that forms an air flow path 2 for taking in outside air or vehicle interior air, adjusting the temperature, and blowing it out into the vehicle interior. It has.
　ケーシング３の内部には、空気流路２の上流側から下流側にかけて順次、外気または車室内空気を吸い込んで昇圧し、それを下流側へと圧送するブロア４と、ブロア４により圧送される空気流を冷却する冷却器５と、冷却器５を流通して冷却された空気流を加熱する放熱器６と、放熱器６に流通される空気流量と放熱器６をバイパスして流通される空気流量との割合を調整し、その下流側で混合される空気流の温度を調節するエアミックスダンパ７と、が設置されている。 Inside the casing 3, a blower 4 that sucks outside air or vehicle interior air in sequence from the upstream side to the downstream side of the air flow path 2 to boost the pressure and pumps it to the downstream side, and air pumped by the blower 4. A cooler 5 that cools the flow, a radiator 6 that flows through the cooler 5 and heats the cooled air flow, and an air flow rate that flows through the radiator 6 and air that flows by bypassing the radiator 6. An air mix damper 7 for adjusting the ratio with the flow rate and adjusting the temperature of the air flow mixed on the downstream side thereof is installed.
　ケーシング３の下流側には、図示省略の複数の空気吹出し流路と、該空気吹出し流路を選択的に開閉し、任意の空気吹出し流路を介して空調風を車室内へと吹出す複数の吹出しモード切替えダンパとが設けられている。
　冷却器５は、図示省略の圧縮機、凝縮器、膨張弁と共に冷媒回路を構成し、膨張弁で断熱膨張された冷媒を蒸発させることにより、そこを流通する空気を冷却するものである。
　放熱器６は、タンク８、ポンプ９および熱媒体加熱装置１０と共に熱媒体循環回路１１を構成し、熱媒体加熱装置１０により加熱された熱媒体（例えば、水）がポンプ９を介して循環されることにより、そこを流通する空気を加温するものである。 On the downstream side of the casing 3, a plurality of air blowing channels (not shown) and a plurality of air blowing channels that are selectively opened and closed to blow air conditioning air into the vehicle interior via an arbitrary air blowing flow path. A blowout mode switching damper is provided.
The cooler 5 constitutes a refrigerant circuit together with a compressor, a condenser, and an expansion valve (not shown), and cools the air flowing thereby by evaporating the refrigerant adiabatically expanded by the expansion valve.
The radiator 6 constitutes a heat medium circulation circuit 11 together with a tank 8, a pump 9, and a heat medium heating device 10, and a heat medium (for example, water) heated by the heat medium heating device 10 is circulated via the pump 9. By doing so, the air circulating there is heated.
　次に、本実施形態に係る熱媒体加熱装置１０について、図２から図１２を用いて説明する。なお、以下の説明において、熱媒体加熱装置１０の長手方向をＸ軸方向とし、熱媒体加熱装置１０の短手方向をＹ軸方向とし、Ｘ軸方向及びＹ軸方向と直交する方向をＺ軸方向として説明する。なお、本実施形態では、Ｚ軸方向が上下方向とされている例について説明するため、Ｚ軸方向を上下方向という場合もある。また、単に長手方向といった場合には熱媒体加熱装置１０の長手方向を意味し、短手方向といった場合には熱媒体加熱装置１０の短手方向を意味している。 Next, the heat medium heating device 10 according to the present embodiment will be described with reference to FIGS. 2 to 12. In the following description, the longitudinal direction of the heat medium heating device 10 is the X-axis direction, the lateral direction of the heat medium heating device 10 is the Y-axis direction, and the X-axis direction and the direction orthogonal to the Y-axis direction are the Z-axis. Explained as a direction. In this embodiment, in order to explain an example in which the Z-axis direction is the vertical direction, the Z-axis direction may be referred to as the vertical direction. Further, the term "longitudinal direction" means the longitudinal direction of the heat medium heating device 10, and the term "short direction" means the short direction of the heat medium heating device 10.
　熱媒体加熱装置１０は、熱媒体（例えば、水）を加熱するための装置である。熱媒体加熱装置１０は、制御基板２３や加熱装置４０等の各種装置が収容される第１ケーシング２０と、第１ケーシング２０の下方に設けられて内部に熱媒体が流通する第２ケーシング３０と、熱媒体を加熱する加熱装置４０と、を備えている。 The heat medium heating device 10 is a device for heating a heat medium (for example, water). The heat medium heating device 10 includes a first casing 20 in which various devices such as a control substrate 23 and a heating device 40 are housed, and a second casing 30 provided below the first casing 20 and through which a heat medium flows. The heating device 40 for heating the heat medium is provided.
　第１ケーシング２０は、図２及び図３に示すように、制御基板２３が収容される制御基板収容部２１と、制御基板収容部２１の底面から下方へ突出する放熱部２２と、を一体的に備えている。第１ケーシング２０は、アルミニウム合金等の熱伝導率が高い金属材料を用いてダイカストにより一体に成形されたダイカスト製品とされている。 As shown in FIGS. 2 and 3, the first casing 20 integrally integrates a control board accommodating portion 21 in which the control substrate 23 is accommodated and a heat radiating portion 22 projecting downward from the bottom surface of the control substrate accommodating portion 21. Be prepared for. The first casing 20 is a die-cast product integrally molded by die-casting using a metal material having high thermal conductivity such as an aluminum alloy.
　制御基板収容部２１は、上方が開放状態の箱状体であって、内部に制御基板２３が収容される空間が形成されている。また、制御基板収容部２１の長手方向（Ｘ軸方向）の一端には、高電圧電源ケーブル（図示省略）が接続される高圧コネクタ２４が設けられている。また、制御基板収容部２１の長手方向の他端には、低電圧電源ケーブル（図示省略）が接続される低圧コネクタ２５が設けられている。制御基板収容部２１の底面には、長手方向に伸びる開口が形成されている。開口は、後述する放熱部２２の凹部２６と連通している。なお、制御基板収容部２１は、蓋体（図示省略）等を設けて、上方を閉鎖してもよい。 The control board accommodating portion 21 is a box-shaped body with an open upper part, and a space for accommodating the control substrate 23 is formed inside. Further, a high-voltage connector 24 to which a high-voltage power cable (not shown) is connected is provided at one end of the control board accommodating portion 21 in the longitudinal direction (X-axis direction). Further, a low-voltage connector 25 to which a low-voltage power cable (not shown) is connected is provided at the other end of the control board accommodating portion 21 in the longitudinal direction. An opening extending in the longitudinal direction is formed on the bottom surface of the control board accommodating portion 21. The opening communicates with the recess 26 of the heat radiating portion 22, which will be described later. The control board accommodating portion 21 may be closed above by providing a lid (not shown) or the like.
　制御基板２３は、後述するＰＴＣヒータ（発熱体）に対する通電を制御するためのもので、制御基板収容部２１内にビス等を介して固定設置されている。制御基板２３は、高圧コネクタ２４に接続される高電圧電源ケーブル（図示省略）及び低圧コネクタ２５に接続される低電圧ケーブル（図示省略）と電気的に接続されている。また、制御基板２３は、後述する電極板４２（電極部）を介してＰＴＣヒータと電気的に接続されている。 The control board 23 is for controlling the energization of the PTC heater (heating element) described later, and is fixedly installed in the control board accommodating portion 21 via a screw or the like. The control board 23 is electrically connected to a high-voltage power cable (not shown) connected to the high-voltage connector 24 and a low-voltage cable (not shown) connected to the low-voltage connector 25. Further, the control board 23 is electrically connected to the PTC heater via an electrode plate 42 (electrode portion) described later.
　放熱部２２は、図５に示すように、制御基板収容部２１の底面の短手方向の略中央領域から下方に突出している。放熱部２２は、制御基板収容部２１の底面から下方へ凹む凹部２６と、外周面から略水平に突出する複数の放熱フィン２７と、を一体的に有している。 As shown in FIG. 5, the heat radiating portion 22 projects downward from the substantially central region of the bottom surface of the control board accommodating portion 21 in the lateral direction. The heat radiating portion 22 integrally includes a recess 26 that is recessed downward from the bottom surface of the control board accommodating portion 21, and a plurality of heat radiating fins 27 that project substantially horizontally from the outer peripheral surface.
　凹部２６は、熱媒体加熱装置１０の長手方向に延在している。凹部２６には、図４に示すように、凹部２６の内部の空間を長手方向に分割する３つの隔壁２８が設けられている。すなわち、隔壁２８によって、凹部２６は４つに分割されている。以下の説明では、単に「凹部２６」といった場合には、分割された凹部２６を意味する。各凹部２６の内部に形成された空間には、加熱装置４０が収容されている。なお、図４では、図示の関係上、制御基板２３を省略して図示している。 The recess 26 extends in the longitudinal direction of the heat medium heating device 10. As shown in FIG. 4, the recess 26 is provided with three partition walls 28 that divide the space inside the recess 26 in the longitudinal direction. That is, the recess 26 is divided into four by the partition wall 28. In the following description, the term "recess 26" simply means a divided recess 26. The heating device 40 is housed in the space formed inside each recess 26. Note that, in FIG. 4, the control board 23 is omitted for the sake of illustration.
　凹部２６は、図５に示すように、制御基板収容部２１の内部空間と連通する入口開口２６ａと、凹部２６の内部に形成される空間の短手方向の両端部を規定する側壁面２６ｂと、凹部２６の内部に形成される空間の下端を規定する底面２６ｃとを有している。 As shown in FIG. 5, the recess 26 includes an inlet opening 26a that communicates with the internal space of the control board accommodating portion 21, and a side wall surface 26b that defines both ends of the space formed inside the recess 26 in the lateral direction. It has a bottom surface 26c that defines the lower end of the space formed inside the recess 26.
　第１ケーシング２０は、ダイカスト製品なので、凹部２６の側壁面２６ｂには抜き勾配が形成されている。すなわち、側壁面２６ｂは、鉛直面に対して所定の角度を為すように傾斜している。詳細には、各側壁面２６ｂは、入口開口２６ａから底面２６ｃに向かうにしたがって、側壁面２６ｂ同士が近付くように傾斜している。 Since the first casing 20 is a die-cast product, a draft is formed on the side wall surface 26b of the recess 26. That is, the side wall surface 26b is inclined so as to form a predetermined angle with respect to the vertical surface. Specifically, each side wall surface 26b is inclined so that the side wall surfaces 26b come closer to each other from the entrance opening 26a toward the bottom surface 26c.
　各放熱フィン２７は、水平方向に延在する板状であって、長手方向の略全域に亘って形成されている。複数の放熱フィン２７は、上下方向（Ｚ軸方向）に所定の間隔で並んで配置されている。 Each heat radiation fin 27 has a plate shape extending in the horizontal direction, and is formed over substantially the entire length direction. The plurality of heat radiation fins 27 are arranged side by side at predetermined intervals in the vertical direction (Z-axis direction).
　第２ケーシング３０は、図５に示すように、熱媒体が流通する流路を形成する流路部３１と、第１ケーシング２０と固定されるフランジ部３２と、を一体的に備えている。また、第２ケーシング３０は、図２及び図３に示すように、流路部３１へ熱媒体を供給する入口部３３と、流路部３１から熱媒体を排出する出口部３４と、を一体的に備えている。 As shown in FIG. 5, the second casing 30 integrally includes a flow path portion 31 that forms a flow path through which the heat medium flows, and a flange portion 32 that is fixed to the first casing 20. Further, as shown in FIGS. 2 and 3, the second casing 30 integrally integrates an inlet portion 33 for supplying the heat medium to the flow path portion 31 and an outlet portion 34 for discharging the heat medium from the flow path portion 31. Prepared for.
　流路部３１は、長手方向（Ｘ軸方向）に延在している。流路部３１の内部には、下方に凹むように形成された流路が設けられている。流路は、長手方向に延在していて、流路を熱媒体が流通する。また、流路には、放熱部２２が配置されている。放熱部２２は、流路部３１と接触しないように、配置されている。すなわち、熱媒体は、流路部３１と放熱部２２との間の空間を流通する。熱媒体は、放熱部２２と熱交換することで、加熱される。 The flow path portion 31 extends in the longitudinal direction (X-axis direction). Inside the flow path portion 31, a flow path formed so as to be recessed downward is provided. The flow path extends in the longitudinal direction, and the heat medium flows through the flow path. Further, a heat radiating unit 22 is arranged in the flow path. The heat radiating portion 22 is arranged so as not to come into contact with the flow path portion 31. That is, the heat medium circulates in the space between the flow path portion 31 and the heat radiating portion 22. The heat medium is heated by exchanging heat with the heat radiating unit 22.
　フランジ部３２は、流路部３１の上端から短手方向に延在している。フランジ部３２の上面に第２ケーシング３０の制御基板収容部２１が載置される。フランジ部３２と制御基板収容部２１とは、固定されている。 The flange portion 32 extends in the lateral direction from the upper end of the flow path portion 31. The control board accommodating portion 21 of the second casing 30 is placed on the upper surface of the flange portion 32. The flange portion 32 and the control board accommodating portion 21 are fixed.
　流路部３１の長手方向（Ｘ軸方向）の一端には、入口部３３が設けられている。入口部３３は、円筒状の部材である。入口部３３の内部には、熱媒体が流通する。入口部３３は、上端が流路部３１の下端に接続されている。熱媒体は、入口部３３を介して流路に流入する。
　流路部３１の長手方向（Ｘ軸方向）の他端には、出口部３４が設けられている。出口部３４は、円筒状の部材である。出口部３４の内部には、熱媒体が流通する。出口部３４は、上端が流路部３１の下端に接続されている。流路を流通して熱交換を終えた熱媒体は、出口部３４を介して熱媒体加熱装置１０の外部へ排出される。 An inlet portion 33 is provided at one end of the flow path portion 31 in the longitudinal direction (X-axis direction). The inlet portion 33 is a cylindrical member. A heat medium circulates inside the inlet 33. The upper end of the inlet portion 33 is connected to the lower end of the flow path portion 31. The heat medium flows into the flow path through the inlet 33.
An outlet portion 34 is provided at the other end of the flow path portion 31 in the longitudinal direction (X-axis direction). The outlet portion 34 is a cylindrical member. A heat medium circulates inside the outlet portion 34. The upper end of the outlet portion 34 is connected to the lower end of the flow path portion 31. The heat medium that has passed through the flow path and has completed heat exchange is discharged to the outside of the heat medium heating device 10 via the outlet portion 34.
　加熱装置４０は、図５に示すように、放熱部２２の凹部２６に収容されている。なお、図５では、図示の関係上、加熱装置４０の樹脂枠４７を省略して図示している。 As shown in FIG. 5, the heating device 40 is housed in the recess 26 of the heat radiating unit 22. In FIG. 5, for the sake of illustration, the resin frame 47 of the heating device 40 is omitted.
　加熱装置４０は、図７から図１２に示すように、平板状のＰＴＣ素子（発熱体）４１と、ＰＴＣ素子４１の板面に固定される一対の電極板（電極部）４２と、ＰＴＣ素子４１の板面に固定される第１絶縁体４３及び第２絶縁体４４と、第１絶縁体４３に固定されるスペーサ４５と、スペーサ４５に固定される板バネ４６と、ＰＴＣ素子４１を固定する樹脂枠４７と、を備えている。なお、図１０及び図１１では、図示の関係上、樹脂枠４７を省略して図示している。また、図１２では、加熱装置４０を構成するＰＴＣ素子４１及び電極板４２のみを図示している。 As shown in FIGS. 7 to 12, the heating device 40 includes a flat plate-shaped PTC element (heating element) 41, a pair of electrode plates (electrode portions) 42 fixed to the plate surface of the PTC element 41, and a PTC element. The first insulator 43 and the second insulator 44 fixed to the plate surface of 41, the spacer 45 fixed to the first insulator 43, the leaf spring 46 fixed to the spacer 45, and the PTC element 41 are fixed. It is provided with a resin frame 47 and a resin frame 47. In addition, in FIG. 10 and FIG. 11, the resin frame 47 is omitted for the sake of illustration. Further, in FIG. 12, only the PTC element 41 and the electrode plate 42 constituting the heating device 40 are shown.
　ＰＴＣ素子４１は、外形が略四角形状であって、平板状の部材である（図１２も参照）。すなわち、ＰＴＣ素子４１は、一側の板面（以下、「一面４１ａ」と称する）と他側の板面（以下、「他面４１ｂ」と称する）とを有している。また、ＰＴＣ素子４１は、一面４１ａと他面４１ｂとを接続する側面４１ｃを有している。
　ＰＴＣ素子４１は、制御基板２３を介して供給される高電圧の電力が電極板４２を経て印加されるようになっている。ＰＴＣ素子４１は、制御基板２３を介してオンオフ制御され、発熱するように構成されている。 The PTC element 41 is a member having a substantially quadrangular outer shape and a flat plate shape (see also FIG. 12). That is, the PTC element 41 has a plate surface on one side (hereinafter, referred to as "one surface 41a") and a plate surface on the other side (hereinafter, referred to as "other surface 41b"). Further, the PTC element 41 has a side surface 41c that connects one surface 41a and the other surface 41b.
In the PTC element 41, high-voltage power supplied via the control board 23 is applied via the electrode plate 42. The PTC element 41 is controlled on and off via a control board 23 and is configured to generate heat.
　一対の電極板４２は、ＰＴＣ素子４１の一面４１ａに固定されている。すなわち、一対の電極板４２を構成するいずれの電極板４２も、ＰＴＣ素子４１のＸ軸方向の両端に１つずつ固定されている。また、各電極板４２は、ＰＴＣ素子４１の同じ板面に固定されている（図１２も参照）。すなわち、一対の電極板４２の一方は、ＰＴＣ素子４１の一面４１ａの一側の端部に設けられ、一対の電極板４２の他方は、ＰＴＣ素子４１の一面４１ａの他側の端部に設けられている。 The pair of electrode plates 42 are fixed to one surface 41a of the PTC element 41. That is, each of the electrode plates 42 constituting the pair of electrode plates 42 is fixed to both ends of the PTC element 41 in the X-axis direction. Further, each electrode plate 42 is fixed to the same plate surface of the PTC element 41 (see also FIG. 12). That is, one of the pair of electrode plates 42 is provided at one end of one surface 41a of the PTC element 41, and the other of the pair of electrode plates 42 is provided at the other end of one surface 41a of the PTC element 41. Has been done.
　各電極板４２は、導電性の金属材料で形成された板状の部材である。各電極板４２は、図１２に示すように、ＰＴＣ素子４１の一面４１ａに固定される固定部４２ａと、固定部４２ａから上方へ突出する接続部４２ｂと、を一体的に有している。 Each electrode plate 42 is a plate-shaped member made of a conductive metal material. As shown in FIG. 12, each electrode plate 42 integrally has a fixing portion 42a fixed to one surface 41a of the PTC element 41 and a connecting portion 42b protruding upward from the fixing portion 42a.
　固定部４２ａは、ＰＴＣ素子４１の一面４１ａと面接触している。固定部４２ａとＰＴＣ素子４１とは、ＰＴＣ素子４１のＸ軸方向の端部において、ＰＴＣ素子４１のＺ軸方向の略全域に亘って面接触している。固定部４２ａとＰＴＣ素子４１とは、接触部分において導電性の接着剤で固定されている。
　接続部４２ｂは、固定部４２ａの上端から上方に延在している。接続部４２ｂのＸ軸方向の長さは、固定部４２ａのＸ軸方向の長さよりも長くなっている。接続部４２ｂの上端は、図５に示すように、放熱部２２の凹部２６の入口開口２６ａよりも上方に位置している。また、接続部４２ｂの上端は、凹部２６の上方に位置している制御基板２３を貫通している。この貫通箇所において、接続部４２ｂと制御基板２３とは電気的に接続されている。 The fixing portion 42a is in surface contact with one surface 41a of the PTC element 41. The fixing portion 42a and the PTC element 41 are in surface contact with each other at the end portion of the PTC element 41 in the X-axis direction over substantially the entire area of the PTC element 41 in the Z-axis direction. The fixing portion 42a and the PTC element 41 are fixed with a conductive adhesive at the contact portion.
The connecting portion 42b extends upward from the upper end of the fixing portion 42a. The length of the connecting portion 42b in the X-axis direction is longer than the length of the fixing portion 42a in the X-axis direction. As shown in FIG. 5, the upper end of the connecting portion 42b is located above the inlet opening 26a of the recess 26 of the heat radiating portion 22. Further, the upper end of the connecting portion 42b penetrates the control board 23 located above the recess 26. At this penetration point, the connecting portion 42b and the control board 23 are electrically connected.
　第１絶縁体４３は、絶縁性を有する材料（例えば、酸化アルミニウム）で形成された板状の部材である。第１絶縁体４３は、図９及び図１１に示すように、ＰＴＣ素子４１と固定される素子固定部４３ａと、固定部４２ａのＸ軸方向の両端部からＸ軸方向に延在する電極固定部４３ｂと、を一体的に有している。すなわち、素子固定部４３ａは、第１絶縁体４３のＸ軸方向の中央領域に設けられ、電極固定部４３ｂは、第１絶縁体４３のＸ軸方向の両端部に設けられている。第１絶縁体４３の上下方向の長さは、ＰＴＣ素子４１の上下方向の長さよりも長い。 The first insulator 43 is a plate-shaped member made of a material having an insulating property (for example, aluminum oxide). As shown in FIGS. 9 and 11, the first insulator 43 has an element fixing portion 43a fixed to the PTC element 41 and an electrode fixing portion extending in the X-axis direction from both ends of the fixing portion 42a in the X-axis direction. It has a portion 43b integrally. That is, the element fixing portions 43a are provided in the central region of the first insulator 43 in the X-axis direction, and the electrode fixing portions 43b are provided at both ends of the first insulator 43 in the X-axis direction. The vertical length of the first insulator 43 is longer than the vertical length of the PTC element 41.
　素子固定部４３ａは、電極固定部４３ｂからＰＴＣ素子４１側へ突出するように形成されている。素子固定部４３ａは、ＰＴＣ素子４１の一面４１ａと面接触している。詳細には、ＰＴＣ素子４１の一面４１ａの中央領域と接触している。具体的には、ＰＴＣ素子４１の一面４１ａのうち、一対の電極板４２が固定されていない領域の略全域と接触している。第１絶縁体４３とＰＴＣ素子４１とは、接触部分において絶縁性を有する接着剤で固定されている。 The element fixing portion 43a is formed so as to project from the electrode fixing portion 43b toward the PTC element 41 side. The element fixing portion 43a is in surface contact with one surface 41a of the PTC element 41. Specifically, it is in contact with the central region of one surface 41a of the PTC element 41. Specifically, of the one surface 41a of the PTC element 41, the pair of electrode plates 42 are in contact with substantially the entire area where they are not fixed. The first insulator 43 and the PTC element 41 are fixed with an adhesive having an insulating property at a contact portion.
　電極固定部４３ｂは、各電極板４２の固定部４２ａと面接触している。詳細には、電極板４２の板面のうち、ＰＴＣ素子４１と固定されていない側の面と面接触している。第１絶縁体４３と電極板４２とは、接触部分において絶縁性を有する接着剤で固定されている。電極固定部４３ｂは、素子固定部４３ａから凹むように形成されている。電極固定部４３ｂのＸ軸方向の長さは、電極固定部４３ｂのＹ軸方向の長さよりも長い。 The electrode fixing portion 43b is in surface contact with the fixing portion 42a of each electrode plate 42. Specifically, it is in surface contact with the surface of the electrode plate 42 that is not fixed to the PTC element 41. The first insulator 43 and the electrode plate 42 are fixed with an adhesive having an insulating property at a contact portion. The electrode fixing portion 43b is formed so as to be recessed from the element fixing portion 43a. The length of the electrode fixing portion 43b in the X-axis direction is longer than the length of the electrode fixing portion 43b in the Y-axis direction.
　第１絶縁体４３のＰＴＣ素子４１側の面は、素子固定部４３ａが電極固定部４３ｂよりも所定距離だけＰＴＣ素子４１側に位置している。この所定距離は、電極板４２の厚さと略同一、または、わずかに長い距離となっている。第１絶縁体４３のＰＴＣ素子４１側と反対側の面（以下、「一面」と称する）は、全域において平面とされている。 On the surface of the first insulator 43 on the PTC element 41 side, the element fixing portion 43a is located on the PTC element 41 side by a predetermined distance from the electrode fixing portion 43b. This predetermined distance is substantially the same as or slightly longer than the thickness of the electrode plate 42. The surface of the first insulator 43 opposite to the PTC element 41 side (hereinafter, referred to as “one surface”) is a flat surface over the entire area.
　第２絶縁体４４は、第１絶縁体４３と同様に、絶縁性を有する材料（例えば、酸化アルミニウム）で形成されている。第２絶縁体４４は、平板状の部材である。第２絶縁体４４は、ＰＴＣ素子４１の他面４１ｂの略全域と面接触している。第２絶縁体４４とＰＴＣ素子４１とは、接触部分において絶縁性を有する接着剤で固定されている。第２絶縁体４４の上下方向の長さは、ＰＴＣ素子４１の上下方向の長さよりも長い。 The second insulator 44 is made of an insulating material (for example, aluminum oxide) like the first insulator 43. The second insulator 44 is a flat plate-shaped member. The second insulator 44 is in surface contact with substantially the entire other surface 41b of the PTC element 41. The second insulator 44 and the PTC element 41 are fixed with an adhesive having an insulating property at a contact portion. The vertical length of the second insulator 44 is longer than the vertical length of the PTC element 41.
　スペーサ４５は、絶縁性を有する金属材料（例えば、アルミニウム合金）で形成されている。スペーサ４５は、図１０に示すように、上端から下端に向かうにしたがって、Ｙ軸方向の長さが短くなるように形成された板状の部材である。スペーサ４５は、Ｘ軸方向と交差する面で切断した断面において、略台形状をしている。スペーサ４５は、図１０に示すように、第１絶縁体４３の一面の略全域において面接触している。スペーサ４５と第１絶縁体４３とは、接触部分において絶縁性を有する接着剤で固定されている。 The spacer 45 is made of an insulating metal material (for example, an aluminum alloy). As shown in FIG. 10, the spacer 45 is a plate-shaped member formed so that the length in the Y-axis direction becomes shorter from the upper end to the lower end. The spacer 45 has a substantially trapezoidal shape in a cross section cut at a surface intersecting the X-axis direction. As shown in FIG. 10, the spacer 45 is in surface contact with each other over substantially the entire surface of one surface of the first insulator 43. The spacer 45 and the first insulator 43 are fixed with an adhesive having an insulating property at a contact portion.
　また、スペーサ４５は、第１絶縁体４３に固定される面とは反対側の面（以下、「対向面４５ａ」と称する）が鉛直面に対して傾斜している。対向面４５ａは、凹部２６の側壁面２６ｂと対向している。対向面４５ａは、ＰＴＣ素子４１の一面４１ａと凹部２６の側壁面２６ｂとが為す角度よりも、対向面４５ａと側壁面２６ｂとが為す角度の方が小さくなるように形成されている。換言すれば、凹部２６の側壁面２６ｂを基準として、対向面の方がＰＴＣ素子４１の一面４１ａよりも平行に近い。
　また、スペーサ４５は、図５及び図６に示すように、対向面４５ａが側壁面２６ｂから離間するように配置されている。 Further, the surface of the spacer 45 opposite to the surface fixed to the first insulator 43 (hereinafter, referred to as “opposing surface 45a”) is inclined with respect to the vertical surface. The facing surface 45a faces the side wall surface 26b of the recess 26. The facing surface 45a is formed so that the angle formed by the facing surface 45a and the side wall surface 26b is smaller than the angle formed by the one surface 41a of the PTC element 41 and the side wall surface 26b of the recess 26. In other words, the facing surface is closer to parallel than the one surface 41a of the PTC element 41 with reference to the side wall surface 26b of the recess 26.
Further, as shown in FIGS. 5 and 6, the spacer 45 is arranged so that the facing surface 45a is separated from the side wall surface 26b.
　板バネ４６は、金属材料（例えば、アルミニウム合金）で形成されている。板バネ４６は、スペーサ４５の対向面に固定されている。板バネ４６は、スペーサ４５に固定される本体部４６ａと、本体部４６ａから突出する複数（本実施形態では、一例として６つ）の板状のバネ部４６ｂを有している。本体部４６ａは、厚さが一定の板状の部材であって、スペーサ４５の対向面と面接触している。板バネ４６とスペーサ４５とは、接触部分において絶縁性を有する接着剤で固定されている。バネ部４６ｂは、図５及び図６に示すように、先端が凹部２６の側壁面２６ｂに接触している。これにより、板バネ４６は、スペーサ４５をＰＴＣ素子４１方向へ付勢している。換言すれば、板バネ４６は、スペーサ４５を介してＰＴＣ素子４１等を凹部２６の一方向側（図５参照）へ付勢している。 The leaf spring 46 is made of a metal material (for example, an aluminum alloy). The leaf spring 46 is fixed to the facing surface of the spacer 45. The leaf spring 46 has a main body portion 46a fixed to the spacer 45 and a plurality of plate-shaped spring portions 46b protruding from the main body portion 46a (six in this embodiment as an example). The main body 46a is a plate-shaped member having a constant thickness, and is in surface contact with the facing surface of the spacer 45. The leaf spring 46 and the spacer 45 are fixed with an adhesive having an insulating property at the contact portion. As shown in FIGS. 5 and 6, the tip of the spring portion 46b is in contact with the side wall surface 26b of the recess 26. As a result, the leaf spring 46 urges the spacer 45 toward the PTC element 41. In other words, the leaf spring 46 urges the PTC element 41 or the like via the spacer 45 toward one direction (see FIG. 5) of the recess 26.
　樹脂枠４７は、絶縁性を有する樹脂で形成されている。また、樹脂枠４７は、矩形枠状の部材である。樹脂枠４７は、内部に空間を形成する枠体部４７ａと、枠体部４７ａからＹ軸方向に延在する支持部４７ｂと、を有している。枠体部４７ａは、内周にＰＴＣ素子４１が配置されている。すなわち、ＰＴＣ素子４１は、枠体部４７ａの内部に形成された空間に配置されている。支持部４７ｂは、第１絶縁体４３、第２絶縁体４４及びスペーサ４５の側面に配置されている。枠体部４７ａの内周部には、第１絶縁体４３及び第２絶縁体４４が絶縁性の接着剤で固定されている。第１絶縁体４３及び第２絶縁体４４の全周が枠体部４７ａに固定されている。なお、第１絶縁体４３及び第２絶縁体４４の全周が枠体部４７ａに固定されていなくてもよい。例えば、第１絶縁体４３及び第２絶縁体４４の上面が枠体部４７ａに固定されていなくてもよい。 The resin frame 47 is made of an insulating resin. The resin frame 47 is a rectangular frame-shaped member. The resin frame 47 has a frame body portion 47a that forms a space inside, and a support portion 47b that extends from the frame body portion 47a in the Y-axis direction. The PTC element 41 is arranged on the inner circumference of the frame body portion 47a. That is, the PTC element 41 is arranged in the space formed inside the frame body portion 47a. The support portion 47b is arranged on the side surface of the first insulator 43, the second insulator 44, and the spacer 45. The first insulator 43 and the second insulator 44 are fixed to the inner peripheral portion of the frame body portion 47a with an insulating adhesive. The entire circumference of the first insulator 43 and the second insulator 44 is fixed to the frame body portion 47a. The entire circumference of the first insulator 43 and the second insulator 44 may not be fixed to the frame portion 47a. For example, the upper surfaces of the first insulator 43 and the second insulator 44 may not be fixed to the frame portion 47a.
　加熱装置４０は、図５に示すように、凹部２６において、ＰＴＣ素子４１の一面４１ａ及び他面４１ｂが、凹部２６の側壁面２６ｂと対向するように収容されている。
　また、加熱装置４０は、凹部２６において、凹部２６の深さ方向（Ｚ軸方向）に沿って延びる中心軸線Ｃを基準として、一方向側に寄るように配置されている。具体的には、加熱装置４０は、凹部２６の一方向側の側壁面２６ｂと接触するとともに、凹部２６の他方向側の側壁面２６ｂと離間するように配置されている（図６参照）。このように加熱装置４０を配置することで、ＰＴＣ素子４１は、電極板４２が固定される一面４１ａの方が、他面４１ｂよりも中心軸線に近い位置となるように配置されている。 As shown in FIG. 5, in the heating device 40, one surface 41a and the other surface 41b of the PTC element 41 are housed in the recess 26 so as to face the side wall surface 26b of the recess 26.
Further, the heating device 40 is arranged in the recess 26 so as to be closer to one direction with respect to the central axis C extending along the depth direction (Z-axis direction) of the recess 26. Specifically, the heating device 40 is arranged so as to be in contact with the side wall surface 26b on the one-way side of the recess 26 and away from the side wall surface 26b on the other direction side of the recess 26 (see FIG. 6). By arranging the heating device 40 in this way, the PTC element 41 is arranged so that the one surface 41a to which the electrode plate 42 is fixed is closer to the central axis than the other surface 41b.
　また、図６に示すように、加熱装置４０と凹部２６との離間距離は、下方に向かうほど広くなっている。すなわち、板バネ４６の本体部４６ａと凹部２６の側壁面２６ｂとの距離が、凹部２６の入口開口２６ａ側（本実施形態では上方側）の距離（図６のＬ１）よりも、凹部２６の底面２６ｃ側（本実施形態では下方側）の距離（図６のＬ２）の方が長くなっている。本実施形態では本体部４６ａの板厚は一定なので、換言すれば、スペーサ４５の対向面４５ａと凹部２６の側壁面２６ｂとの距離は、凹部２６の入口開口２６ａ側よりも、凹部２６の底面２６ｃ側の方が長くなっている。 Further, as shown in FIG. 6, the separation distance between the heating device 40 and the recess 26 becomes wider toward the lower side. That is, the distance between the main body portion 46a of the leaf spring 46 and the side wall surface 26b of the recess 26 is larger than the distance (L1 in FIG. 6) of the recess 26 on the inlet opening 26a side (upper side in this embodiment) of the recess 26. The distance (L2 in FIG. 6) on the bottom surface 26c side (lower side in this embodiment) is longer. In the present embodiment, the plate thickness of the main body portion 46a is constant, so in other words, the distance between the facing surface 45a of the spacer 45 and the side wall surface 26b of the recess 26 is greater than the distance between the inlet opening 26a side of the recess 26 and the bottom surface of the recess 26. The 26c side is longer.
　加熱装置４０と凹部２６の側壁面２６ｂとの間には、ポッティング剤（充填材）４８が充填されている。詳細には、板バネ４６と側壁面２６ｂとの間には、ポッティング剤４８が充填されている。
　ポッティング剤４８は、例えば、空気よりも熱伝導率が高いシリコーン系の樹脂材である。なお、シリコーン系の樹脂材は一例であり、ポッティング剤４８として他のものを用いてもよい。
　また、ポッティング剤４８には、常温の状態では低粘度の液状であって、加熱することで所定の弾性を有する弾性体となる材料が用いられる。例えば、本実施形態のポッティング剤４８として、硬化方式が二液付加に分類されるシリコーンゴムを利用することができる。 A potting agent (filler) 48 is filled between the heating device 40 and the side wall surface 26b of the recess 26. Specifically, the potting agent 48 is filled between the leaf spring 46 and the side wall surface 26b.
The potting agent 48 is, for example, a silicone-based resin material having a higher thermal conductivity than air. The silicone-based resin material is an example, and other materials may be used as the potting agent 48.
Further, as the potting agent 48, a material that is a low-viscosity liquid at room temperature and becomes an elastic body having a predetermined elasticity by heating is used. For example, as the potting agent 48 of the present embodiment, a silicone rubber whose curing method is classified as two-component addition can be used.
　ポッティング剤４８は、加熱装置４０を凹部２６に収容してから加熱装置４０と凹部２６との間にポッティング剤４８を注入することで充填されてもよい。また、凹部２６に充填剤を注入してから加熱装置４０を凹部２６に収容することでポッティング剤４８を充填されてもよい。なお、加熱装置４０を凹部２６へ収容する際に、凹部２６と接触する面（第２絶縁体４４の板面）にグリースを塗布してもよい。グリースを塗布することで、加熱装置４０と凹部２６との摩擦が低減され、凹部２６へ加熱装置４０を収容し易くすることができる。また、ポッティング剤４８は、充填後に加熱され弾性体とされる。 The potting agent 48 may be filled by accommodating the heating device 40 in the recess 26 and then injecting the potting agent 48 between the heating device 40 and the recess 26. Further, the potting agent 48 may be filled by injecting the filler into the recess 26 and then accommodating the heating device 40 in the recess 26. When the heating device 40 is housed in the recess 26, grease may be applied to the surface in contact with the recess 26 (the plate surface of the second insulator 44). By applying grease, the friction between the heating device 40 and the recess 26 is reduced, and the heating device 40 can be easily accommodated in the recess 26. Further, the potting agent 48 is heated after filling to become an elastic body.
　本実施形態によれば、以下の作用効果を奏する。
　本実施形態では、加熱装置４０の板バネ４６の本体部４６ａと凹部２６とが離間している。これにより、加熱装置４０を凹部２６内に収容する際に、凹部２６からＰＴＣ素子４１に作用する荷重が抑制される。したがって、ＰＴＣ素子４１の損傷を抑制することができる。 According to this embodiment, the following effects are exhibited.
In the present embodiment, the main body 46a of the leaf spring 46 of the heating device 40 and the recess 26 are separated from each other. As a result, when the heating device 40 is housed in the recess 26, the load acting on the PTC element 41 from the recess 26 is suppressed. Therefore, damage to the PTC element 41 can be suppressed.
　また、加熱装置４０と凹部２６の側壁面２６ｂとの間に、空気よりも熱伝導率が高いポッティング剤４８が充填されている。これにより、加熱装置４０と凹部２６との間に空気が存在する場合と比較して、ＰＴＣ素子４１から放熱部２２へ効率的に熱を伝達することができる。したがって、熱媒体加熱装置１０の放熱性を向上させ、性能を向上させることができる。 Further, a potting agent 48 having a higher thermal conductivity than air is filled between the heating device 40 and the side wall surface 26b of the recess 26. As a result, heat can be efficiently transferred from the PTC element 41 to the heat radiating unit 22 as compared with the case where air exists between the heating device 40 and the recess 26. Therefore, the heat dissipation property of the heat medium heating device 10 can be improved and the performance can be improved.
　また、本実施形態では、加熱装置４０と凹部２６の側壁面２６ｂとの間に、ポッティング剤４８が充填されている。また、ポッティング剤４８は、充填後に加熱され弾性体とされている。これにより、熱媒体加熱装置１０を使用する際には、加熱装置４０と凹部２６との間に、弾性体が設けられている。例えば、加熱装置４０と凹部２６とが弾性を有さない固体同士で略全面で接触している場合には、熱応力が生じて加熱装置４０が損傷する可能性がある。本実施形態では、上述のように、加熱装置４０と凹部２６との間に弾性体が設けられている。したがって、加熱装置４０の損傷を抑制することができる。 Further, in the present embodiment, the potting agent 48 is filled between the heating device 40 and the side wall surface 26b of the recess 26. Further, the potting agent 48 is heated after filling to form an elastic body. As a result, when using the heat medium heating device 10, an elastic body is provided between the heating device 40 and the recess 26. For example, when the heating device 40 and the recess 26 are in contact with each other on substantially the entire surface of non-elastic solids, thermal stress may occur and the heating device 40 may be damaged. In the present embodiment, as described above, an elastic body is provided between the heating device 40 and the recess 26. Therefore, damage to the heating device 40 can be suppressed.
　また、スペーサ４５は、側壁面２６ｂと対向する対向面４５ａを有し、板面と側壁面２６ｂとが為す角度よりも対向面４５ａと側壁面２６ｂとが為す角度が小さくなるように形成されている。換言すれば、凹部２６の側壁面２６ｂを基準として、スペーサ４５の対向面４５ａの方がＰＴＣ素子４１の板面よりも平行に近い。よって、凹部２６の深さ方向（Ｚ軸方向）において、対向面４５ａと側壁面２６ｂとの距離が均一化される。これにより、対向面４５ａと側壁面２６ｂとの間に充填される充填剤の厚さ（Ｙ軸方向の長さ）も均一化される。したがって、ＰＴＣ素子４１から放熱部２２への熱の伝達量を、凹部２６の深さ方向において均一化することができる。 Further, the spacer 45 has a facing surface 45a facing the side wall surface 26b, and is formed so that the angle formed by the facing surface 45a and the side wall surface 26b is smaller than the angle formed by the plate surface and the side wall surface 26b. There is. In other words, the facing surface 45a of the spacer 45 is closer to parallel than the plate surface of the PTC element 41 with reference to the side wall surface 26b of the recess 26. Therefore, the distance between the facing surface 45a and the side wall surface 26b is made uniform in the depth direction (Z-axis direction) of the recess 26. As a result, the thickness (length in the Y-axis direction) of the filler filled between the facing surface 45a and the side wall surface 26b is also made uniform. Therefore, the amount of heat transferred from the PTC element 41 to the heat radiating portion 22 can be made uniform in the depth direction of the recess 26.
　本実施形態では、板バネ４６によって加熱装置４０が凹部２６内の一方向側に寄せて配置されている。これにより、加熱装置４０を凹部２６の中心に配置する場合と比較して、加熱装置４０と凹部２６の側壁面２６ｂとが離間する距離を長くすることができる。よって、ポッティング剤４８を充填し易くすることができる。 In the present embodiment, the heating device 40 is arranged closer to one direction in the recess 26 by the leaf spring 46. As a result, the distance between the heating device 40 and the side wall surface 26b of the recess 26 can be increased as compared with the case where the heating device 40 is arranged at the center of the recess 26. Therefore, the potting agent 48 can be easily filled.
　本実施形態では、ＰＴＣ素子４１、電極板４２、第１絶縁体４３、第２絶縁体４４及びスペーサ４５が接着剤で固定されている。また、樹脂枠４７に第１絶縁体４３及び第２絶縁体４４が固定されている。これにより、ＰＴＣ素子４１とスペーサ４５と樹脂枠４７が一体化されていない場合と比較して、容易にＰＴＣ素子４１、スペーサ４５及び樹脂枠４７を凹部２６に収容することができる。
　また、ＰＴＣ素子４１が絶縁部材で形成される樹脂枠４７によって囲われている。これにより、電極板４２と放熱部２２とを樹脂枠４７によって絶縁することができる。よって、絶縁性を向上させることができ、電極板４２からの漏電を抑制することができる。
　また、樹脂枠４７に対して、第１絶縁体４３及び第２絶縁体４４の全周を絶縁性接着剤で固定されている。これにより、ポッティング剤４８をＰＴＣ素子４１の側面４１ｃに付着することを抑制することができ、耐熱温度の低いポッティング剤４８を使用することができる。 In the present embodiment, the PTC element 41, the electrode plate 42, the first insulator 43, the second insulator 44, and the spacer 45 are fixed with an adhesive. Further, the first insulator 43 and the second insulator 44 are fixed to the resin frame 47. As a result, the PTC element 41, the spacer 45, and the resin frame 47 can be easily accommodated in the recess 26 as compared with the case where the PTC element 41, the spacer 45, and the resin frame 47 are not integrated.
Further, the PTC element 41 is surrounded by a resin frame 47 formed of an insulating member. As a result, the electrode plate 42 and the heat radiating portion 22 can be insulated by the resin frame 47. Therefore, the insulating property can be improved and the electric leakage from the electrode plate 42 can be suppressed.
Further, the entire circumference of the first insulator 43 and the second insulator 44 is fixed to the resin frame 47 with an insulating adhesive. As a result, it is possible to prevent the potting agent 48 from adhering to the side surface 41c of the PTC element 41, and the potting agent 48 having a low heat resistant temperature can be used.
　本実施形態では、ＰＴＣ素子４１の板面のうち、中心軸線Ｃに近い側の板面である一面４１ａに、一対の電極板４２の両方が固定されていている。これにより、電極板４２を凹部２６の中心軸線Ｃに近い位置に設けることができる。換言すれば、電極板４２を凹部２６の側壁面２６ｂから遠い位置に設けることができる。したがって、電極板４２を中心軸線Ｃから遠い側の板面（他面４１ｂ）に固定する場合と比較して、電極板４２と放熱部２２との絶縁距離を長くすることができる。よって、絶縁性を向上させることができ、電極板４２からの漏電を抑制することができる。
　なお、中心軸線Ｃとは、ＹＺ平面で見た際に、凹部２６の中心を通る線を意味している。 In the present embodiment, both of the pair of electrode plates 42 are fixed to one surface 41a, which is the plate surface of the PTC element 41 on the side closer to the central axis C. As a result, the electrode plate 42 can be provided at a position close to the central axis C of the recess 26. In other words, the electrode plate 42 can be provided at a position far from the side wall surface 26b of the recess 26. Therefore, the insulation distance between the electrode plate 42 and the heat radiating portion 22 can be increased as compared with the case where the electrode plate 42 is fixed to the plate surface (other surface 41b) far from the central axis C. Therefore, the insulating property can be improved and the electric leakage from the electrode plate 42 can be suppressed.
The central axis C means a line passing through the center of the recess 26 when viewed in the YZ plane.
　また、本実施形態では、電極板４２は、ＰＴＣ素子４１の一面４１ａの一側の端部と他側の端部とに配置されている。これにより、電極板４２同士が離間する距離を長くすることができる。すなわち、電極板４２同士の絶縁距離を長くすることができる。これにより、耐電圧を向上させることができる。 Further, in the present embodiment, the electrode plate 42 is arranged at one end of one surface 41a of the PTC element 41 and the other end of the PTC element 41. As a result, the distance between the electrode plates 42 can be increased. That is, the insulation distance between the electrode plates 42 can be increased. Thereby, the withstand voltage can be improved.
　例えば、一対の電極板４２のうちの一方の電極をＰＴＣ素子４１の一面４１ａに設け、他方の電極板４２をＰＴＣ素子４１の他面４１ｂに設け、一方の電極板４２と他方の電極板４２とを、板面を平面視した際に両端となる位置に設けることも考えられる。すなわち、一方の電極板４２と他方の電極板４２とがＰＴＣ素子４１を挟んでＰＴＣ素子４１の対角となるように設けることが考えられる。
　本実施形態では、ＰＴＣ素子４１の一面４１ａの両端に設けた一対の電極板４２によって導電している。これにより、上述したように、一方の電極板４２と他方の電極板４２との絶縁距離が長くなるため、耐電圧を向上させることができる。一方で、ＰＴＣ素子４１が損傷すると、電極板４２同士が導電しなくなりＰＴＣ素子４１が発熱しなくなってしまう可能性があった。しかしながら、本実施形態では、上述のように、ＰＴＣ素子４１の損傷が抑制されるので、耐電性の向上と、ＰＴＣ素子４１の信頼性の向上を両立することができる。 For example, one electrode of the pair of electrode plates 42 is provided on one surface 41a of the PTC element 41, the other electrode plate 42 is provided on the other surface 41b of the PTC element 41, and one electrode plate 42 and the other electrode plate 42 are provided. It is also conceivable to provide and at positions that are both ends when the plate surface is viewed in a plan view. That is, it is conceivable that one electrode plate 42 and the other electrode plate 42 are provided so as to be diagonal to the PTC element 41 with the PTC element 41 interposed therebetween.
In this embodiment, the conductor is conducted by a pair of electrode plates 42 provided at both ends of one surface 41a of the PTC element 41. As a result, as described above, the insulation distance between one electrode plate 42 and the other electrode plate 42 becomes long, so that the withstand voltage can be improved. On the other hand, if the PTC element 41 is damaged, the electrode plates 42 may not conduct with each other and the PTC element 41 may not generate heat. However, in the present embodiment, as described above, damage to the PTC element 41 is suppressed, so that both improvement in electric resistance and improvement in reliability of the PTC element 41 can be achieved at the same time.
　本実施形態では、スペーサ４５の対向面４５ａと凹部２６の側壁面２６ｂとの距離は、凹部２６の入口開口２６ａ側よりも、凹部２６の底面２６ｃ側の方が長い。これにより、ポッティング剤４８を充填する際に、空気が入口開口２６ａから抜け易い。したがって、好適にポッティング剤４８を充填することができる。
　なお、加熱装置４０を凹部２６に収容してからポッティング剤４８を充填する場合であっても、凹部２６にポッティング剤４８を注入してから加熱装置４０を凹部２６に収容する場合であっても、入口開口２６ａから空気を好適に排出することができる。よって、好適にポッティング剤４８を充填することができる。 In the present embodiment, the distance between the facing surface 45a of the spacer 45 and the side wall surface 26b of the recess 26 is longer on the bottom surface 26c side of the recess 26 than on the inlet opening 26a side of the recess 26. As a result, when the potting agent 48 is filled, air can easily escape from the inlet opening 26a. Therefore, the potting agent 48 can be preferably filled.
Even when the heating device 40 is housed in the recess 26 and then filled with the potting agent 48, or when the potting agent 48 is injected into the recess 26 and then the heating device 40 is housed in the recess 26. , Air can be suitably discharged from the inlet opening 26a. Therefore, the potting agent 48 can be suitably filled.
　本実施形態では、電極板４２と凹部２６の側壁面２６ｂとの間に第１絶縁体４３及び第２絶縁体４４が設けられている。これにより、電極板４２と放熱部２２とを第１絶縁体４３及び第２絶縁体４４によって絶縁することができる。したがって、電極板４２からの漏電を抑制することができる。 In the present embodiment, the first insulator 43 and the second insulator 44 are provided between the electrode plate 42 and the side wall surface 26b of the recess 26. As a result, the electrode plate 42 and the heat radiating portion 22 can be insulated by the first insulator 43 and the second insulator 44. Therefore, it is possible to suppress electric leakage from the electrode plate 42.
　本実施形態では、ＰＴＣ素子４１と電極板４２とが接着剤で固定されている。これにより、電極とＰＴＣ素子４１との間で好適に通電させることができる。 In this embodiment, the PTC element 41 and the electrode plate 42 are fixed with an adhesive. As a result, electricity can be suitably applied between the electrode and the PTC element 41.
　また、本実施形態では、第１絶縁体４３と、電極板４２及びＰＴＣ素子４１とは、絶縁性の接着剤で固定されている。これにより、電極板４２またはＰＴＣ素子４１と絶縁体とを接着剤により固定することができる。したがって、電極板４２間の短絡を抑制することができる。 Further, in the present embodiment, the first insulator 43, the electrode plate 42, and the PTC element 41 are fixed with an insulating adhesive. As a result, the electrode plate 42 or the PTC element 41 and the insulator can be fixed with an adhesive. Therefore, a short circuit between the electrode plates 42 can be suppressed.
　また、本実施形態では、加熱装置４０を構成するＰＴＣ素子４１、電極板４２、第１絶縁体４３、第２絶縁体４４及びスペーサ４５が接着剤で固定されている。これにより、各部材の間の空気を排除することができる。したがって、各部材間での熱抵抗が低減されるので、ＰＴＣ素子４１から放熱部２２へ好適に熱を伝えることができる。 Further, in the present embodiment, the PTC element 41, the electrode plate 42, the first insulator 43, the second insulator 44, and the spacer 45 constituting the heating device 40 are fixed with an adhesive. This makes it possible to eliminate air between the members. Therefore, since the thermal resistance between the members is reduced, heat can be suitably transferred from the PTC element 41 to the heat radiating unit 22.
　なお、本開示は、上記実施形態に限定されるものではなく、その要旨を逸脱しない範囲において、適宜変形が可能である。
　例えば、上記実施形態では、一対の電極板４２をＰＴＣ素子４１の一面４１ａに設ける例について説明したが、本開示はこれに限定されない。例えば、一対の電極板４２の一方を、ＰＴＣ素子４１のＸ軸方向の一側の側面４１ｃに設け、一対の電極板４２の他方を、ＰＴＣ素子４１のＸ軸方向の他側の側面４１ｃに設けてもよい。
　このように構成した場合でも、電極板４２を中心軸線Ｃから遠い側の板面（他面４１ｂ）に固定する場合と比較して、電極板４２と放熱部２２との絶縁距離を長くすることができる。よって、絶縁性を向上させることができ、電極板４２からの漏電を抑制することができる。 The present disclosure is not limited to the above embodiment, and can be appropriately modified without departing from the gist thereof.
For example, in the above embodiment, an example in which a pair of electrode plates 42 are provided on one surface 41a of the PTC element 41 has been described, but the present disclosure is not limited to this. For example, one of the pair of electrode plates 42 is provided on one side surface 41c of the PTC element 41 in the X-axis direction, and the other of the pair of electrode plates 42 is provided on the other side surface 41c of the PTC element 41 in the X-axis direction. It may be provided.
Even in this configuration, the insulation distance between the electrode plate 42 and the heat radiating portion 22 is longer than in the case where the electrode plate 42 is fixed to the plate surface (other surface 41b) far from the central axis C. Can be done. Therefore, the insulating property can be improved and the electric leakage from the electrode plate 42 can be suppressed.
　また、加熱装置４０は、板バネ４６を省略して構成してもよい。その場合には、凹部２６に加熱装置４０を収容する際に、凹部２６の一方向側に寄るように収容する。このように構成した場合でも、電極板４２を中心軸線Ｃから遠い側の板面（他面４１ｂ）に固定する場合と比較して、電極板４２と放熱部２２との絶縁距離を長くすることができる。よって、絶縁性を向上させることができ、電極板４２からの漏電を抑制することができる。 Further, the heating device 40 may be configured by omitting the leaf spring 46. In that case, when the heating device 40 is housed in the recess 26, it is housed so as to be closer to one direction of the recess 26. Even in this configuration, the insulation distance between the electrode plate 42 and the heat radiating portion 22 is longer than in the case where the electrode plate 42 is fixed to the plate surface (other surface 41b) far from the central axis C. Can be done. Therefore, the insulating property can be improved and the electric leakage from the electrode plate 42 can be suppressed.
　また、例えば、スペーサ４５が導電性を有する場合には、電極板４２をＰＴＣ素子４１の板面のうち、スペーサ４５が設けられる板面とは反対側の板面に固定してもよい。このようにすることで、導電性を有する部材から電極板４２を遠ざけることができる。したがって、絶縁性を向上させることができ、電極板４２からの漏電を抑制することができる。 Further, for example, when the spacer 45 has conductivity, the electrode plate 42 may be fixed to the plate surface of the PTC element 41 opposite to the plate surface on which the spacer 45 is provided. By doing so, the electrode plate 42 can be kept away from the conductive member. Therefore, the insulating property can be improved and the electric leakage from the electrode plate 42 can be suppressed.
　また、例えば、加熱装置４０の両側が凹部２６の側壁面２６ｂから離間するように加熱装置４０を配置し、ポッティング剤４８を加熱装置４０の両側に充填してもよい。 Further, for example, the heating device 40 may be arranged so that both sides of the heating device 40 are separated from the side wall surface 26b of the recess 26, and the potting agent 48 may be filled on both sides of the heating device 40.
　また、低電圧ケーブルは低圧コネクタでもよい。
　また、高圧コネクタと低圧コネクタは長手方向の同一端に設けられてもよい。
　また、電極板は固定部４２ａと電極固定部４３ｂのＹ軸方向の長さが等しくてもよい。 Further, the low voltage cable may be a low voltage connector.
Further, the high-voltage connector and the low-voltage connector may be provided at the same end in the longitudinal direction.
Further, the electrode plate may have the same length in the Y-axis direction of the fixing portion 42a and the electrode fixing portion 43b.
　また、第１絶縁体４３はＹ軸方向の段差位置にて別体としてもよい。すなわち、スペーサ４５に固定される平板状のスペーサ側絶縁体と、ＰＴＣ素子４１に固定される平板状のＰＴＣ素子側絶縁体と、を別体として構成し、スペーサ側絶縁体の板面の中央部にＰＴＣ素子側絶縁体の板面を固定してもよい。その際、スペーサ側絶縁体とＰＴＣ素子側の絶縁体とは、絶縁性接着剤にて固定されてもよい。 Further, the first insulator 43 may be separated at a step position in the Y-axis direction. That is, the flat plate-shaped spacer-side insulator fixed to the spacer 45 and the flat-plate-shaped PTC element-side insulator fixed to the PTC element 41 are configured as separate bodies, and the center of the plate surface of the spacer-side insulator is formed. The plate surface of the insulator on the PTC element side may be fixed to the portion. At that time, the insulator on the spacer side and the insulator on the PTC element side may be fixed with an insulating adhesive.
　また、上記実施形態で説明した板バネ４６の代わりに、第１絶縁体４３とスペーサ４５との間に板バネを設けてもよい。この場合には、板バネは、第１絶縁体４３に絶縁性を有する接着剤で固定されてもよい。また、この場合には、板バネのバネ部の先端がスペーサ４５に接触していて、板バネが、第１絶縁体４３をＰＴＣ素子４１方向に付勢している。また、この場合には、ポッティング剤が、スペーサ４５と板バネとの間に充填されてもよい。 Further, instead of the leaf spring 46 described in the above embodiment, a leaf spring may be provided between the first insulator 43 and the spacer 45. In this case, the leaf spring may be fixed to the first insulator 43 with an adhesive having an insulating property. Further, in this case, the tip of the spring portion of the leaf spring is in contact with the spacer 45, and the leaf spring urges the first insulator 43 toward the PTC element 41. Further, in this case, the potting agent may be filled between the spacer 45 and the leaf spring.
　また、第２絶縁体４４と凹部２６の側壁面２６ｂとの間に板バネを設けてもよい。この場合には、板バネは、第２絶縁体４４に絶縁性を有する接着剤で固定されてもよい。また、この場合には、板バネのバネ部は、先端が凹部２６の側壁面２６ｂに接触している。なお、板バネと側壁面２６ｂとの間にスペーサを設けてもよく、スペーサを設けた場合には、板バネのバネ部の先端は、スペーサに接触している。これにより、板バネは、第２絶縁体４４をＰＴＣ素子４１方向に付勢している。また、この場合には、ポッティング剤４８が、板バネ４６と側壁面２６ｂもしくはスペーサとの間に充填されてもよい。 Further, a leaf spring may be provided between the second insulator 44 and the side wall surface 26b of the recess 26. In this case, the leaf spring may be fixed to the second insulator 44 with an adhesive having an insulating property. Further, in this case, the tip of the spring portion of the leaf spring is in contact with the side wall surface 26b of the recess 26. A spacer may be provided between the leaf spring and the side wall surface 26b, and when the spacer is provided, the tip of the spring portion of the leaf spring is in contact with the spacer. As a result, the leaf spring urges the second insulator 44 in the direction of the PTC element 41. Further, in this case, the potting agent 48 may be filled between the leaf spring 46 and the side wall surface 26b or the spacer.
　以上説明した各実施形態に記載の熱媒体加熱装置及び車両用空調装置は例えば以下のように把握される。 The heat medium heating device and the vehicle air conditioner described in each of the above-described embodiments are grasped as follows, for example.
　本開示の一実施形態に係る熱媒体加熱装置は、板状の発熱体（４１）と、前記発熱体の板面（４１ａ）と側壁面（２６ｂ）とが対向するように前記発熱体を収容する凹部（２６）を有し、前記発熱体の熱を熱媒体へ放熱する放熱部（２２）と、前記発熱体に固定される一対の電極部（４２）と、を備え、前記発熱体は、前記凹部の深さ方向に沿って延びる中心軸線（Ｃ）を基準として、一方向側に配置され、前記中心軸線に近い側の前記発熱体の板面には、一対の前記電極部が固定されていている。 The heating medium heating device according to the embodiment of the present disclosure accommodates the heating element so that the plate-shaped heating element (41) and the plate surface (41a) and the side wall surface (26b) of the heating element face each other. The heating element is provided with a heat radiating portion (22) that has a recess (26) to dissipate heat from the heating element to a heating medium, and a pair of electrode portions (42) fixed to the heating element. A pair of the electrode portions are fixed to the plate surface of the heating element which is arranged in one direction with reference to the central axis (C) extending along the depth direction of the recess and is closer to the central axis. Has been done.
　上記構成では、発熱体の板面のうち中心軸線に近い側の板面に、一対の電極部の両方が固定されている。これにより、電極部を凹部の中心軸線に近い位置に設けることができる。換言すれば、電極部を凹部の側壁面から遠い位置に設けることができる。したがって、例えば、放熱部が導電性の部材であっても、電極部を中心軸線から遠い側の板面に固定する場合と比較して、電極部と放熱部との絶縁距離を長くすることができる。よって、絶縁性を向上させることができ、電極部からの漏電を抑制することができる。
　なお、中心軸線とは、ＹＺ平面で見た際に、凹部の中心を通る線を意味している。 In the above configuration, both of the pair of electrode portions are fixed to the plate surface of the heating element on the side closer to the central axis. As a result, the electrode portion can be provided at a position close to the central axis of the recess. In other words, the electrode portion can be provided at a position far from the side wall surface of the recess. Therefore, for example, even if the heat radiating portion is a conductive member, the insulation distance between the electrode portion and the heat radiating portion can be lengthened as compared with the case where the electrode portion is fixed to the plate surface on the side far from the central axis. can. Therefore, the insulating property can be improved and the electric leakage from the electrode portion can be suppressed.
The central axis means a line passing through the center of the recess when viewed on the YZ plane.
　また、本開示の一実施形態に係る熱媒体加熱装置は、一対の前記電極部の一方は、前記発熱体の前記板面の一側の端部に設けられ、一対の前記電極部の他方は、前記発熱体の前記板面の他側の端部に設けられている。 Further, in the heat medium heating device according to the embodiment of the present disclosure, one of the pair of the electrode portions is provided at one end of the plate surface of the heating element, and the other of the pair of the electrode portions is provided. , Is provided at the other end of the plate surface of the heating element.
　上記構成では、電極部は、発熱体の板面の一側の端部と他側の端部とに配置されている。これにより、電極部同士の距離を長くすることができる。すなわち、電極部同士の距離を長くすることができる。これにより、耐電圧を向上させることができる。 In the above configuration, the electrode portions are arranged at one end of the plate surface of the heating element and the other end. As a result, the distance between the electrode portions can be increased. That is, the distance between the electrode portions can be increased. Thereby, the withstand voltage can be improved.
　また、本開示の一実施形態に係る熱媒体加熱装置は、板状の発熱体（４１）と、前記発熱体の板面（４１ａ）と側壁面（２６ｂ）とが対向するように前記発熱体を収容する凹部（２６）を有し、前記発熱体の熱を熱媒体へ放熱する放熱部（２２）と、前記発熱体に固定される一対の電極部（４２）と、を備え、前記発熱体は、前記凹部の深さ方向に沿って延びる中心軸線を基準として、一方向側に配置され、一対の前記電極部の一方は、前記発熱体の一側の側面（２６ｃ）に設けられ、一対の前記電極部の他方は、前記発熱体の他側の側面（２６ｃ）に設けられている。 Further, in the heating medium heating device according to the embodiment of the present disclosure, the heating element (41) and the heating element such that the plate surface (41a) and the side wall surface (26b) of the heating element face each other. A heat radiating portion (22) that has a recess (26) for accommodating the heating element and radiates heat of the heating element to a heating medium, and a pair of electrode portions (42) fixed to the heating element. The body is arranged unidirectionally with reference to a central axis extending along the depth direction of the recess, and one of the pair of electrode portions is provided on one side surface (26c) of the heating element. The other side of the pair of electrode portions is provided on the other side surface (26c) of the heating element.
　上記構成では、発熱体が中心軸線を基準として一方向側に配置されている。すなわち、発熱体の板面には、中心軸線に近い側の面と中心軸線から遠い側の面とが存在する。また、上記構成では、発熱体の側面に、一対の電極部の両方が固定されている。これにより、電極部を中心軸線から遠い側の板面に固定する場合と比較して、電極部を凹部の中心軸線に近い位置に設けることができる。換言すれば、電極部を凹部の側壁面から遠い位置に設けることができる。したがって、例えば、放熱部が導電性の部材であっても、電極部を中心軸線から遠い側の板面に固定する場合と比較して、電極部と放熱部との絶縁距離を長くすることができる。よって、絶縁性を向上させることができ、電極部からの漏電を抑制することができる。
　また、上記構成では、電極部は、発熱体の板面の側面と他側の側面とに配置されている。これにより、電極部同士の距離を長くすることができる。すなわち、電極部同士の距離を長くすることができる。これにより、耐電圧を向上させることができる。 In the above configuration, the heating element is arranged in one direction with respect to the central axis. That is, the plate surface of the heating element includes a surface on the side close to the central axis and a surface on the side far from the central axis. Further, in the above configuration, both of the pair of electrode portions are fixed to the side surface of the heating element. As a result, the electrode portion can be provided at a position closer to the central axis of the recess as compared with the case where the electrode portion is fixed to the plate surface on the side far from the central axis. In other words, the electrode portion can be provided at a position far from the side wall surface of the recess. Therefore, for example, even if the heat radiating portion is a conductive member, the insulation distance between the electrode portion and the heat radiating portion can be lengthened as compared with the case where the electrode portion is fixed to the plate surface on the side far from the central axis. can. Therefore, the insulating property can be improved and the electric leakage from the electrode portion can be suppressed.
Further, in the above configuration, the electrode portions are arranged on the side surface of the plate surface of the heating element and the side surface on the other side. As a result, the distance between the electrode portions can be increased. That is, the distance between the electrode portions can be increased. Thereby, the withstand voltage can be improved.
　また、本開示の一実施形態に係る熱媒体加熱装置は、前記発熱体と前記電極部とは、導電性の接着剤で固定されている。 Further, in the heat medium heating device according to the embodiment of the present disclosure, the heating element and the electrode portion are fixed with a conductive adhesive.
　上記構成では、発熱体と電極とが接着剤で固定されている。これにより、電極と発熱体との間で好適に通電させることができる。 In the above configuration, the heating element and the electrode are fixed with an adhesive. As a result, electricity can be suitably applied between the electrode and the heating element.
　また、本開示の一実施形態に係る熱媒体加熱装置は、前記電極部と前記側壁面との間に設けられ、前記電極部または前記発熱体の少なくとも１つに固定される絶縁体を備え、前記電極部または前記発熱体と前記絶縁体とは、絶縁性の接着剤で固定されている。 Further, the heat medium heating device according to the embodiment of the present disclosure includes an insulator provided between the electrode portion and the side wall surface and fixed to at least one of the electrode portion or the heating element. The electrode portion or the heating element and the insulator are fixed with an insulating adhesive.
　上記構成では、電極部と側壁面との間に絶縁体が設けられている。これにより、例えば、放熱部が導電性の部材であっても、電極部と放熱部とを絶縁体によって絶縁することができる。したがって、電極部からの漏電を抑制することができる。
　また、電極部または発熱体と絶縁体とは、絶縁性の接着剤で固定されている。これにより、電極部からの漏電を抑制することができる。
　また、電極部または発熱体と絶縁体との間に接着剤が設けられている。これにより、発熱体と電極との間の空気を排除することができる。したがって、各部材間での熱抵抗が低減される。したがって、発熱体から絶縁体を介して放熱部へ好適に熱を伝えることができる。 In the above configuration, an insulator is provided between the electrode portion and the side wall surface. Thereby, for example, even if the heat radiating portion is a conductive member, the electrode portion and the heat radiating portion can be insulated by an insulator. Therefore, it is possible to suppress electric leakage from the electrode portion.
Further, the electrode portion or the heating element and the insulator are fixed with an insulating adhesive. This makes it possible to suppress electric leakage from the electrode portion.
Further, an adhesive is provided between the electrode portion or the heating element and the insulator. This makes it possible to eliminate air between the heating element and the electrodes. Therefore, the thermal resistance between the members is reduced. Therefore, heat can be suitably transferred from the heating element to the heat radiating portion via the insulator.
　また、本開示の一実施形態に係る車両用空調装置は、上記いずれかに記載の熱媒体加熱装置（１０）と、空気流路（２）と、該空気流路に外気または車室内空気を循環させるブロア（４）と、該ブロアの下流側に設けられている冷却器（５）と、該冷却器の下流側に設けられている放熱器（６）と、を備えた車両用空調装置において、前記放熱器には、前記熱媒体加熱装置により加熱された熱媒体が循環可能に構成されている。 Further, the vehicle air conditioner according to the embodiment of the present disclosure includes the heat medium heating device (10), the air flow path (2), and the outside air or the vehicle interior air in the air flow path according to any one of the above. A vehicle air conditioner including a blower (4) for circulation, a cooler (5) provided on the downstream side of the blower, and a radiator (6) provided on the downstream side of the cooler. In the radiator, the heat medium heated by the heat medium heating device is configured to be circulatory.
１　　　：車両用空調装置
２　　　：空気流路
３　　　：ケーシング
４　　　：ブロア
５　　　：冷却器
６　　　：放熱器
７　　　：エアミックスダンパ
８　　　：タンク
９　　　：ポンプ
１０　　：熱媒体加熱装置
１１　　：熱媒体循環回路
２０　　：第１ケーシング
２１　　：制御基板収容部
２２　　：放熱部
２３　　：制御基板
２４　　：高圧コネクタ
２５　　：低圧コネクタ
２６　　：凹部
２６ａ　：入口開口
２６ｂ　：側壁面
２６ｃ　：底面
２７　　：放熱フィン
２８　　：隔壁
３０　　：第２ケーシング
３１　　：流路部
３２　　：フランジ部
３３　　：入口部
３４　　：出口部
４０　　：加熱装置
４１　　：ＰＴＣ素子（発熱体）
４１ａ　：一面
４１ｂ　：他面
４１ｃ　：側面
４２　　：電極板（電極部）
４２ａ　：固定部
４２ｂ　：接続部
４３　　：第１絶縁体
４３ａ　：素子固定部
４３ｂ　：電極固定部
４４　　：第２絶縁体
４５　　：スペーサ
４５ａ　：対向面
４６　　：板バネ
４６ａ　：本体部
４６ｂ　：バネ部
４７　　：樹脂枠
４７ａ　：枠体部
４７ｂ　：支持部
４８　　：ポッティング剤
Ｃ　　　：中心軸線 1: Vehicle air conditioner 2: Air flow path 3: Casing 4: Blower 5: Cooler 6: Heater 7: Air mix damper 8: Tank 9: Pump 10: Heat medium heating device 11: Heat medium circulation circuit 20: 1st casing 21: Control board accommodating part 22: Heat dissipation part 23: Control board 24: High pressure connector 25: Low pressure connector 26: Recess 26a: Inlet opening 26b: Side wall surface 26c: Bottom surface 27: Heat dissipation fin 28: Partition 30: Second Casing 31: Flow path 32: Flange 33: Inlet 34: Outlet 40: Heating device 41: PTC element (heating element)
41a: One surface 41b: Other surface 41c: Side surface 42: Electrode plate (electrode portion)
42a: Fixing part 42b: Connecting part 43: First insulator 43a: Element fixing part 43b: Electrode fixing part 44: Second insulator 45: Spacer 45a: Facing surface 46: Leaf spring 46a: Main body part 46b: Spring part 47 : Resin frame 47a: Frame body 47b: Support 48: Potting agent C: Central axis

Claims (6)

  1. 　板状の発熱体と、
    　前記発熱体の板面と側壁面とが対向するように前記発熱体を収容する凹部を有し、前記発熱体の熱を熱媒体へ放熱する放熱部と、
    　前記発熱体に固定される一対の電極部と、を備え、
    　前記発熱体は、前記凹部の深さ方向に沿って延びる中心軸線を基準として、一方向側に配置され、
    　前記中心軸線に近い側の前記発熱体の板面には、一対の前記電極部が固定されている熱媒体加熱装置。     A plate-shaped heating element and
    A heat radiating portion that has a recess for accommodating the heating element so that the plate surface and the side wall surface of the heating element face each other and dissipates heat of the heating element to a heat medium.
    A pair of electrode portions fixed to the heating element are provided.
    The heating element is arranged in one direction with respect to the central axis extending along the depth direction of the recess.
    A heat medium heating device in which a pair of electrode portions are fixed to a plate surface of the heating element on the side close to the central axis.
  2. 　一対の前記電極部の一方は、前記発熱体の前記板面の一側の端部に設けられ、
    　一対の前記電極部の他方は、前記発熱体の前記板面の他側の端部に設けられている請求項１に記載の熱媒体加熱装置。     One of the pair of electrode portions is provided at one end of the plate surface of the heating element.
    The heat medium heating device according to claim 1, wherein the other of the pair of electrode portions is provided at the other end of the plate surface of the heating element.
  3. 　板状の発熱体と、
    　前記発熱体の板面と側壁面とが対向するように前記発熱体を収容する凹部を有し、前記発熱体の熱を熱媒体へ放熱する放熱部と、
    　前記発熱体に固定される一対の電極部と、を備え、
    　前記発熱体は、前記凹部の深さ方向に沿って延びる中心軸線を基準として、一方向側に配置され、
    　一対の前記電極部の一方は、前記発熱体の一側の側面に設けられ、
    　一対の前記電極部の他方は、前記発熱体の他側の側面に設けられている熱媒体加熱装置。     A plate-shaped heating element and
    A heat radiating portion that has a recess for accommodating the heating element so that the plate surface and the side wall surface of the heating element face each other and dissipates heat of the heating element to a heat medium.
    A pair of electrode portions fixed to the heating element are provided.
    The heating element is arranged in one direction with respect to the central axis extending along the depth direction of the recess.
    One of the pair of electrode portions is provided on one side surface of the heating element.
    The other side of the pair of electrode portions is a heat medium heating device provided on the other side surface of the heating element.
  4. 　前記発熱体と前記電極部とは、導電性の接着剤で固定されている請求項１から請求項３のいずれかに記載の熱媒体加熱装置。 The heat medium heating device according to any one of claims 1 to 3, wherein the heating element and the electrode portion are fixed with a conductive adhesive.
  5. 　前記電極部と前記側壁面との間に設けられ、前記電極部または前記発熱体の少なくとも１つに固定される絶縁体を備え、
    　前記電極部または前記発熱体と前記絶縁体とは、絶縁性の接着剤で固定されている請求項１から請求項４のいずれかに記載の熱媒体加熱装置。     An insulator provided between the electrode portion and the side wall surface and fixed to at least one of the electrode portion or the heating element is provided.
    The heat medium heating device according to any one of claims 1 to 4, wherein the electrode portion or the heating element and the insulator are fixed with an insulating adhesive.
  6. 　請求項１から請求項５のいずれかに記載の熱媒体加熱装置と、
    　空気流路と、
    　該空気流路に外気または車室内空気を循環させるブロアと、
    　該ブロアの下流側に設けられている冷却器と、
    　該冷却器の下流側に設けられている放熱器と、を備えた車両用空調装置において、
    　前記放熱器には、前記熱媒体加熱装置により加熱された熱媒体が循環可能に構成されている車両用空調装置。     The heat medium heating device according to any one of claims 1 to 5.
    With the air flow path
    A blower that circulates outside air or vehicle interior air through the air flow path,
    A cooler provided on the downstream side of the blower and
    In a vehicle air conditioner provided with a radiator provided on the downstream side of the cooler.
    A vehicle air conditioner in which a heat medium heated by the heat medium heating device can be circulated in the radiator.
PCT/JP2021/005145 2020-02-13 2021-02-12 Heat medium heating device and vehicle air conditioning device WO2021162069A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0545987U (en) * 1991-11-15 1993-06-18 株式会社小糸製作所 Sheet heating element
JP2008109137A (en) * 2006-10-25 2008-05-08 Catem Gmbh & Co Kg Heat-generating element for electric heating device and method for manufacture of the same
JP2009196385A (en) * 2008-02-19 2009-09-03 Denso Corp Electric heater
JP2018131148A (en) * 2017-02-17 2018-08-23 三菱重工オートモーティブサーマルシステムズ株式会社 Heat medium heating device and air conditioner for vehicle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0545987U (en) * 1991-11-15 1993-06-18 株式会社小糸製作所 Sheet heating element
JP2008109137A (en) * 2006-10-25 2008-05-08 Catem Gmbh & Co Kg Heat-generating element for electric heating device and method for manufacture of the same
JP2009196385A (en) * 2008-02-19 2009-09-03 Denso Corp Electric heater
JP2018131148A (en) * 2017-02-17 2018-08-23 三菱重工オートモーティブサーマルシステムズ株式会社 Heat medium heating device and air conditioner for vehicle

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