Heating device and electric vehicle

Abstract

The present application relates to a heating device and an electric vehicle, and provides a technology capable of uniformly heating a heat medium. The heating device includes: a plurality of heaters each extending along a first direction, and the plurality of heaters being arranged along a second direction orthogonal to the first direction; a housing portion housing the plurality of heaters; a supply flow path extending along the first direction above the housing portion, and the supply flow path being for a flow of the heat medium supplied to the housing portion; and a supply port communicating the supply flow path with the housing portion, and the supply port extending along the first direction. The supply flow path can include a contraction portion extending from an inlet side to a downstream side thereof. The contraction portion can have a flow path area that decreases from the inlet side of the supply flow path toward the downstream side.

Description

Technical Field

[0001] The technologies disclosed in this specification relate to heating devices and electric vehicles. Background Technology

[0002] Patent Document 1 discloses a heating device. The heating device of Patent Document 1 includes a PTC heater, a housing for housing the PTC heater, and a supply flow path for the flow of a heat medium supplied to the housing.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-218117 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] In heating apparatuses that heat a heat medium using heaters, multiple heaters are sometimes used, extending in the same direction (a first direction) and arranged in a direction orthogonal to that direction (a second direction). Furthermore, in this case, the heat medium is sometimes supplied in a manner that causes it to flow along the direction in which the multiple heaters are arranged (the second direction). In this case, the heat medium may not be heated uniformly. For example, when the heat medium is supplied from a supply path to a housing containing the heaters, the heat medium may not be supplied smoothly from the supply path to the housing near the inlet of the supply path. Consequently, near the inlet of the supply path, the heaters may overheat, resulting in the inability to heat the heat medium uniformly. This specification provides a technique for uniformly heating a heat medium.

[0008] Solution for solving the problem

[0009] In a first technical solution of this invention, the heating device includes: a plurality of heaters, each extending along a first direction, and the plurality of heaters arranged along a second direction orthogonal to the first direction; a receiving portion that receives the plurality of heaters; a supply flow path extending above the receiving portion along the first direction, and the supply flow path being used for the flow of a heat medium supplied to the receiving portion; and a supply port communicating the supply flow path with the receiving portion, and the supply port extending along the first direction. Alternatively, the supply flow path may have a constriction extending downstream from its inlet side. Alternatively, the flow area of ​​the constriction may decrease as it moves downstream from the inlet side of the supply flow path.

[0010] According to this structure, the supply flow path has a constriction section, which increases the pressure of the heat medium and allows for smooth supply of the heat medium from the supply flow path to the receiving section near the inlet of the supply flow path. This suppresses overheating of the heater near the inlet of the supply flow path and enables uniform heating of the heat medium.

[0011] In the second technical solution, based on the first technical solution described above, the flow area of ​​the contraction section can also be reduced by reducing the width of the supply flow path in the second direction.

[0012] According to this structure, since the heat medium flows smoothly in the second direction, the heat medium can be smoothly supplied to the containment section.

[0013] In the third technical solution, according to the first or second technical solution described above, the flow path area of ​​the contraction section can also be reduced by reducing the width of the supply flow path in a third direction orthogonal to the first direction and the second direction.

[0014] According to this structure, since the heat medium flows smoothly to a third direction, the heat medium can be smoothly supplied to the containment section.

[0015] In the fourth technical solution, the electric vehicle may also have a heating device from any of the first to third technical solutions mentioned above. Attached Figure Description

[0016] Figure 1 This is a top view of the heating device in the embodiment.

[0017] Figure 2 This is a side view of the heating device in the embodiment.

[0018] Figure 3 yes Figure 1 Sectional view III-III.

[0019] Figure 4 This is a top view of a modified heating device.

[0020] Figure 5 This is a side view of the heating device in a modified example.

[0021] Figure 6 This is a top view of another variation of the heating device.

[0022] Figure 7 This is a side view of a heating device in another variation.

[0023] Explanation of reference numerals in the attached figures

[0024] 2. Heating device; 10. Heater; 12. Terminal; 14. General heater; 16. Specific heater; 16a. First specific heater; 20. Housing; 22. Main body; 22a. Heating flow path; 24. Supply section; 24a. Supply flow path; 26. Discharge section; 26a. Discharge flow path; 28. Receiving section; 32. Upper surface; 33. Front surface; 34. Lower surface; 35. Rear surface; 36. Side; 38. Supply port; 40. Discharge 42. Exit; 44. Upper surface; 46. Inner surface; 50. Outer surface; 52. Second part; 54. Third part; 58. Inlet; 60. Outlet; 70. Inlet pipe; 72. Outlet pipe; 90. First part; 92. Second part; 102. Heating element; 104. Cylinder; 106. Insulator; 142. Upper surface; 144. Inner surface; 146. Outer surface; 150. First part; 152. Second part. Detailed Implementation

[0025] The heating device 2 of the embodiment will be described with reference to the accompanying drawings. Figures 1 to 3 As shown, the heating device 2 of this embodiment includes a housing 20 and a plurality of heaters 10 disposed within the housing 20. The heating device 2 is an apparatus for heating a liquid or gaseous heat medium using the plurality of heaters 10. For example, the heating device 2 heats a heat medium (e.g., water or coolant) in a heating system installed in an electric vehicle. Furthermore, in the following description, the X direction in the figures will be designated as the first direction D1, the Y direction as the second direction D2, and the Z direction as the third direction D3. The first direction D1, the second direction D2, and the third direction D3 are mutually orthogonal directions.

[0026] The housing 20 of the heating device 2 includes a main body 22, a supply section 24 connected to the main body 22, and a discharge section 26 connected to the main body 22 on the side opposite to the supply section 24. The supply section 24 and the discharge section 26 are opposite to each other in the second direction D2.

[0027] The main body 22 is a generally flat container that extends along a first direction D1 and a second direction D2. The main body 22 forms a housing section 28 that houses a plurality of heaters 10. The housing section 28 forms a heating flow path 22a for the flow of the heat medium heated by the plurality of heaters 10.

[0028] The main body 22 includes an upper surface 32, a lower surface 34, a front surface 33, a rear surface 35, and a pair of side surfaces 36. In addition, the main body 22 includes a supply port 38 provided on the supply section 24 side and a discharge port 40 provided on the discharge section 26 side.

[0029] The upper surface portion 32 and the lower surface portion 34 of the main body portion 22 extend along a first direction D1 and a second direction D2, respectively. A plurality of heaters 10 are disposed between the upper surface portion 32 and the lower surface portion 34. A heating flow path 22a is formed between the upper surface portion 32 and the lower surface portion 34.

[0030] The front surface portion 33 and the rear surface portion 35 of the main body portion 22 extend along the second direction D2 and the third direction D3, respectively. A pair of side portions 36 of the main body portion 22 extend along the first direction D1 and the third direction D3, respectively. A plurality of heaters 10 are disposed between the pair of side portions 36.

[0031] The supply port 38 and the discharge port 40 of the main body 22 are respectively provided on the upper surface portion 32 of the main body 22 and open upwards. The supply port 38 and the discharge port 40 extend elongatedly along the first direction D1. The supply port 38 is located upstream of the plurality of heaters 10 in the flow direction of the heat medium, and the discharge port 40 is located downstream of the plurality of heaters 10 in the flow direction of the heat medium.

[0032] A plurality of heaters 10 are housed in a housing portion 28 of the main body 22. The plurality of heaters 10 are arranged in a row along a heating flow path 22a of the main body 22. Each of the plurality of heaters 10 extends along a first direction D1. The plurality of heaters 10 are arranged at intervals along a second direction D2 orthogonal to the first direction D1. The plurality of heaters 10 are arranged along the flow direction of the heat medium. The plurality of heaters 10 heat the heat medium flowing in the heating flow path 22a.

[0033] Multiple heaters 10 are, for example, sheathed heaters. Figure 3 As shown in the enlarged view, the heater 10 includes a heating element 102 made of nickel-chromium alloy wire, a cylindrical body 104 housing the heating element 102, and a powdered insulator 106 filled between the heating element 102 and the cylindrical body 104. The heater 10 is generally cylindrical. Furthermore, since the structure of the sheathed heater is already known, detailed descriptions are omitted.

[0034] The heater 10 has terminals 12, 12 at both ends along its length (first direction D1). One end of the heater 10 along its length is fixed to the front surface 33 of the main body 22 of the housing 20, penetrating the front surface 33. The other end of the heater 10 along its length is fixed to the rear surface 35 of the main body 22 of the housing 20, penetrating the rear surface 35. The terminals 12, 12 of the heater 10 are located outside the housing 20 and are electrically connected to an external power source. The heater 10 generates heat by electricity supplied from the external power source via the terminals 12, 12. The heater 10 generates heat by current flowing through the heating element 102.

[0035] Multiple heaters 10 can also be electrically connected in parallel. Alternatively, multiple heaters 10 can be electrically connected in series. In this embodiment, several (e.g., four) of the multiple heaters 10 are electrically connected in series. In addition, groups of multiple (e.g., four) heaters 10 connected in series are electrically connected in parallel.

[0036] Next, the supply section 24 of the housing 20 will be described. The supply section 24 of the housing 20 is fixed to the upper surface 32 of the main body 22. The supply section 24 is connected to the supply port 38 provided on the upper surface 32 of the main body 22. The supply section 24 is located upstream of the main body 22 in the flow direction of the heat medium. The supply section 24 forms a supply flow path 24a for supplying heat medium to the receiving section 28 (heating flow path 22a) of the main body 22. The supply section 24 supplies heat medium to the receiving section 28 (heating flow path 22a) of the main body 22 through the supply port 38 of the main body 22. The supply port 38 connects the supply flow path 24a with the receiving section 28 (heating flow path 22a). The supply flow path 24a is located above the receiving section 28 (heating flow path 22a).

[0037] The supply section 24 extends along a first direction D1. The supply section 24 includes an upper surface portion 42, an inner surface portion 44, and an outer surface portion 46. The upper surface portion 42 extends along the first direction D1 and a second direction D2. The inner surface portion 44 and the outer surface portion 46 extend along the first direction D1 and a third direction D3, respectively. The inner surface portion 44 is positioned in the second direction D2 at a position closer to the outer surface portion 46 than the outer surface portion 46 (towards the discharge section 26). The outer surface portion 46 is positioned in the second direction D2 at a position further outward than the inner surface portion 44 (on the side opposite to the discharge section 26). A supply flow path 24a is formed between the inner surface portion 44 and the outer surface portion 46.

[0038] The supply section 24 includes a first part 50, a second part 52, and a third part 54. The first part 50, the second part 52, and the third part 54 are arranged in a first direction D1. The first part 50, the second part 52, and the third part 54 are arranged sequentially from the upstream side to the downstream side in the flow direction of the heat medium.

[0039] The first section 50 of the supply unit 24 has an inlet 58 for a heat medium. The inlet 58 of the first section 50 opens in a first direction D1. An inlet pipe 70 is connected to the inlet 58 of the first section 50. The upstream end of the inlet pipe 70 is connected to a heat medium supply source, and the downstream end is connected to the inlet 58 of the supply unit 24. The inlet pipe 70 supplies heat medium to the supply flow path 24a of the supply unit 24 through the inlet 58 of the supply unit 24. Heat medium is supplied from the inlet pipe 70 to the first section 50 of the supply unit 24.

[0040] The upper surface portion 42 of the first portion 50 of the supply section 24 is inclined relative to the first direction D1. The upper surface portion 42 of the first portion 50 descends from the upstream side (i.e., the inlet 58 side of the supply flow path 24a) towards the downstream side in the flow direction of the heat medium. As the upper surface portion 42 of the first portion 50 moves from the upstream side to the downstream side in the flow direction of the heat medium, it approaches the supply port 38 of the heating flow path 22a of the main body 22. The flow path area of ​​the supply flow path 24a in the first portion 50 decreases (contracts) as it moves from the upstream side to the downstream side in the flow direction of the heat medium. The flow path area of ​​the supply flow path 24a in the first portion 50 decreases due to the narrowing of the width of the supply flow path 24a in the third direction D3. Furthermore, the flow path area of ​​the supply flow path 24a is the cross-sectional area of ​​the section of the supply flow path 24a orthogonal to the first direction D1.

[0041] The upper surface portion 42 of the second part 52 of the supply section 24 is inclined relative to the first direction D1. The upper surface portion 42 of the second part 52 descends from the upstream side to the downstream side in the flow direction of the heat medium. As the upper surface portion 42 of the second part 52 moves from the upstream side to the downstream side in the flow direction of the heat medium, it approaches the supply port 38 of the heating flow path 22a of the main body 22.

[0042] The outer surface portion 46 of the second part 52 is inclined relative to the first direction D1. The outer surface portion 46 of the second part 52 approaches the inner surface portion 44 as it moves from the upstream side to the downstream side in the flow direction of the hot medium. The flow area of ​​the supply flow path 24a in the second part 52 decreases (contracts) as it moves from the upstream side to the downstream side in the flow direction of the hot medium. The flow area of ​​the supply flow path 24a in the second part 52 decreases due to the narrowing of the width of the supply flow path 24a in the second direction D2 and the third direction D3. The flow area of ​​the supply flow path 24a in the second part 52 is smaller than the flow area of ​​the supply flow path 24a in the first part 50.

[0043] The upper surface 42 of the third portion 54 of the supply section 24 is inclined relative to the first direction D1. The upper surface 42 of the third portion 54 descends from the upstream side to the downstream side in the flow direction of the heat medium. As the upper surface 42 of the third portion 54 moves from the upstream side to the downstream side in the flow direction of the heat medium, it approaches the supply port 38 of the heating flow path 22a of the main body 22. The flow path area of ​​the supply flow path 24a in the third portion 54 decreases (contracts) as it moves from the upstream side to the downstream side in the flow direction of the heat medium. The flow path area of ​​the supply flow path 24a in the third portion 54 decreases due to the narrowing of the width of the supply flow path 24a in the third direction D3. The flow path area of ​​the supply flow path 24a in the third portion 54 is smaller than the flow path area of ​​the supply flow path 24a in the second portion 52.

[0044] Next, the discharge portion 26 of the housing 20 will be described. The discharge portion 26 of the housing 20 is fixed to the upper surface portion 32 of the main body portion 22. The discharge portion 26 is connected to the outlet 40 provided on the upper surface portion 32 of the main body portion 22. The discharge portion 26 is located downstream of the main body portion 22 in the flow direction of the heat medium. The discharge portion 26 forms a discharge flow path 26a for the heat medium discharged from the receiving portion 28 (heating flow path 22a) of the main body portion 22. The heat medium is discharged from the heating flow path 22a through the outlet 40 into the discharge flow path 26a. The outlet 40 connects the receiving portion 28 (heating flow path 22a) and the discharge flow path 26a. The discharge flow path 26a is located above the receiving portion 28 (heating flow path 22a). The discharge portion 26 discharges the heat medium discharged from the main body portion 22 to the outside.

[0045] The discharge section 26 extends along a first direction D1. The discharge section 26 includes an upper surface portion 142, an inner surface portion 144, and an outer surface portion 146. The upper surface portion 142 extends along the first direction D1 and a second direction D2. The inner surface portion 144 and the outer surface portion 146 extend along the first direction D1 and a third direction D3, respectively. The inner surface portion 144 is positioned in the second direction D2 at a position closer to the outer surface portion 146 (on the supply section 24 side). The outer surface portion 146 is positioned in the second direction D2 at a position further to the outside of the inner surface portion 144 (on the side opposite to the supply section 24). A discharge flow path 26a is formed between the inner surface portion 144 and the outer surface portion 146.

[0046] The discharge section 26 has an outlet 60 for the hot medium. The outlet 60 of the discharge section 26 opens in a first direction D1. The outlet 60 of the discharge section 26 faces the same direction as the inlet 58 of the supply section 24. Figure 1 The outlet 26 has an opening on its right side. An outlet pipe 72 is connected to the outlet 60 of the discharge section 26. The upstream end of the outlet pipe 72 is connected to the outlet 60 of the discharge section 26, and the downstream end is connected to the destination of the hot medium discharge. The hot medium is discharged from the discharge flow path 26a of the discharge section 26 through the outlet 60 of the discharge section 26 to the outlet pipe 72. The outlet pipe 72 discharges the hot medium discharged from the discharge section 26 to the external discharge destination.

[0047] In the heating device 2 described above, a heat medium is supplied from the inlet pipe 70 to the supply section 24 of the housing 20. The heat medium is supplied from the inlet 58 of the first section 50 of the supply section 24 to the supply flow path 24a. The heat medium supplied to the supply flow path 24a of the first section 50 flows downstream in the supply flow path 24a, thereby supplying the second section 52 and the third section 54 of the supply section 24.

[0048] Additionally, a portion of the heat medium supplied to the first part 50 is supplied from the supply flow path 24a of the first part 50 to the heating flow path 22a of the main body 22. A portion of the heat medium supplied to the second part 52 is supplied from the supply flow path 24a of the second part 52 to the heating flow path 22a of the main body 22. The heat medium supplied to the third part 54 is supplied from the supply flow path 24a of the third part 54 to the heating flow path 22a of the main body 22. The heat medium flowing in the supply flow path 24a is supplied to the heating flow path 22a through the supply port 38 of the main body 22.

[0049] The heat medium supplied to the heating flow path 22a of the main body 22 flows downstream in the heating flow path 22a and is heated by the plurality of heaters 10 disposed in the heating flow path 22a. The heat medium heated by the plurality of heaters 10 flows downstream in the heating flow path 22a and is discharged to the discharge section 26. The heat medium flowing in the heating flow path 22a is discharged through the discharge outlet 40 of the main body 22 to the discharge flow path 26a of the discharge section 26. The heat medium discharged to the discharge section 26 is discharged from the outlet 60 of the discharge section 26 to the outlet pipe 72.

[0050] (Effect)

[0051] The heating device 2 of the embodiment has been described above. As can be seen from the above description, the heating device 2 includes: a plurality of heaters 10, each extending along a first direction D1 and arranged along a second direction D2; and a receiving portion 28 that receives the plurality of heaters 10. Furthermore, the heating device 2 includes: a supply flow path 24a extending above the receiving portion 28 along the first direction D1, and the supply flow path 24a is used for the flow of a heat medium supplied to the receiving portion 28; and a supply port 38 communicating with the receiving portion 28, and the supply port 38 extending along the first direction D1. The supply portion 24a includes a first portion 50 extending downstream from its inlet 58 side. The flow area of ​​the first portion 50 decreases as it extends downstream from the inlet 58 side of the supply flow path 24a.

[0052] According to this structure, by having a first portion 50 with a reduced flow path area, the pressure of the heat medium can be increased in the first portion 50, and the heat medium can be smoothly supplied from the supply flow path 24a to the receiving portion 28 at a position near the inlet 58 of the supply flow path 24a. As a result, overheating of the heater 10 at the position near the inlet 58 of the supply flow path 24a can be suppressed, and the heat medium can be heated uniformly.

[0053] The flow area of ​​the first part 50 is reduced by narrowing the width of the third direction D3 of the supply flow path 24a. According to this structure, the hot medium can be squeezed to flow downward, and the hot medium can be smoothly supplied to the receiving part 28.

[0054] Furthermore, the supply section 24 includes a second portion 52, the flow area of ​​which decreases as it moves downstream from the inlet 58 side of the supply flow path 24a. The flow area of ​​the second portion 52 decreases as the width of the supply flow path 24a in the second direction D2 decreases. With this structure, the heat medium can be compressed laterally, and the heat medium can be smoothly supplied to the receiving section 28.

[0055] (Correspondence)

[0056] The first part 50 of the supply section 24 of the housing 20 is an example of a "contraction section". The second part 52 of the supply section 24 of the housing 20 is another example of a "contraction section".

[0057] (Modified example)

[0058] (1) The outer surface 46 of the first portion 50 of the supply section 24 of the housing 20 may also be inclined relative to the first direction D1. The outer surface 46 of the first portion 50 may also move closer to the inner surface 44 as it moves from the upstream side to the downstream side in the flow direction of the heat medium. The flow area of ​​the supply flow path 24a at the first portion 50 may also be reduced by reducing the width of the supply flow path 24a in the second direction D2.

[0059] (2) The outer surface 46 of the third part 54 of the supply section 24 of the housing 20 may also be inclined relative to the first direction D1. The outer surface 46 of the third part 54 may also move closer to the inner surface 44 as it moves from the upstream side to the downstream side in the flow direction of the heat medium. The flow area of ​​the supply flow path 24a at the third part 54 may also be reduced by reducing the width of the supply flow path 24a in the second direction D2.

[0060] (3) The outer surface 46 of the second part 52 of the supply section 24 of the housing 20 may not be inclined relative to the first direction D1.

[0061] (4) The length of the first direction D1 of the first part 50 of the supply section 24 is not particularly limited. The length of the first direction D1 of the first part 50 of the supply section 24 may be, for example, less than 1 / 2, 1 / 3 or 1 / 4 of the length of the first direction D1 of the supply section 24.

[0062] (5) The length of the first direction D1 of the second part 52 of the supply section 24 is not particularly limited. The length of the first direction D1 of the second part 52 of the supply section 24 may be, for example, less than 1 / 2, 1 / 3 or 1 / 4 of the length of the first direction D1 of the supply section 24.

[0063] (6) The length of the first direction D1 of the third part 54 of the supply section 24 is not particularly limited. The length of the first direction D1 of the third part 54 of the supply section 24 may be, for example, less than 1 / 2, 1 / 3 or 1 / 4 of the length of the first direction D1 of the supply section 24.

[0064] (7) In the above embodiments, the supply section 24 of the housing 20 includes a first portion 50, a second portion 52, and a third portion 54, but is not limited to this structure. In variations, such as Figure 4 and Figure 5 As shown, it can also be structured as follows: the supply section 24 of the housing 20 has a first part 150 and a second part 152, but does not have a third part.

[0065] In a modified example, the upper surface portion 42 of the first portion 150 of the supply section 24 is inclined relative to the first direction D1. The upper surface portion 42 of the first portion 150 descends from the upstream side (i.e., the inlet 58 side of the supply flow path 24a) towards the downstream side in the flow direction of the hot medium. As the upper surface portion 42 of the first portion 150 moves from the upstream side to the downstream side in the flow direction of the hot medium, it approaches the supply port 38 of the heating flow path 22a of the main body 22. The flow path area of ​​the supply flow path 24a at the first portion 150 decreases (contracts) as it moves from the upstream side to the downstream side in the flow direction of the hot medium. The flow path area of ​​the supply flow path 24a at the first portion 150 decreases due to the narrowing of the width of the supply flow path 24a in the third direction D3. The first portion 150 of the supply section 24 is another example of a "contraction portion". Furthermore, the flow area of ​​the supply flow path 24a at the second part 152 can either decrease as it flows from the upstream side to the downstream side in the direction of the flow of the heat medium, or it can remain unchanged (it can either shrink or not shrink).

[0066] (8) such as Figure 6 As shown, the plurality of heaters 10 may also include a plurality of general heaters 14 and a plurality of specific heaters 16. The plurality of general heaters 14 are positioned downstream of the plurality of specific heaters 16 in the flow direction of the heat medium. The plurality of general heaters 14 are positioned closer to the discharge flow path 26a than the plurality of specific heaters 16. The plurality of specific heaters 16 are positioned upstream of the plurality of general heaters 14 in the flow direction of the heat medium. The plurality of specific heaters 16 are positioned closer to the supply flow path 24a than the plurality of general heaters 14.

[0067] like Figure 6 and Figure 7As shown, the specific heater 16 includes a first portion 90 and a second portion 92. The first portion 90 and the second portion 92 are arranged along a first direction D1. The first portion 90 is located on the side closer to the front surface portion 33 of the main body portion 22 than the second portion 92. The first portion 90 is located on the side closer to the inlet 58 of the supply flow path 24a than the second portion 92. The second portion 92 is located on the side closer to the rear surface portion 35 of the main body portion 22 than the first portion 90. The second portion 92 is located on the side farther from the inlet 58 of the supply flow path 24a than the first portion 90.

[0068] The resistance per unit length of the heating element 102 at the first portion 90 of the specific heater 16 is smaller than the resistance per unit length of the heating element 102 at the second portion 92. Therefore, the heat generated per unit length of the heating element 102 at the first portion 90 of the specific heater 16 is smaller than the heat generated per unit length of the heating element 102 at the second portion 92. Furthermore, in a modified embodiment, the specific heater 16 may not have a heating element 102 at the first portion 90. The first portion 90 of the specific heater 16 may also not generate heat.

[0069] Each of the plurality of specific heaters 16 includes a first specific heater 16a. The first specific heater 16a is the heater 10 among the plurality of heaters 10 that is located closest to the supply flow path 24a. The first specific heater 16a is the outermost heater 10 among the plurality of heaters 10 arranged in the second direction D2 that is located on the side of the supply flow path 24a.

[0070] Typically, heater 14 has a different structure from specific heater 16, and does not have the first and second parts like specific heater 16. Typically, heater 14 has the same heat output per unit length in the longitudinal direction (first direction D1). Typically, the resistance of the heating element 102 of heater 14 is the same per unit length from one end in the longitudinal direction (first direction D1) to the other end, and the heat output per unit length is the same.

[0071] Furthermore, in the above-described modifications, the plurality of heaters 10 have a plurality of specific heaters 16, but this structure is not limited to this. In the modifications, there may not be a plurality of specific heaters 16. Alternatively, the plurality of heaters 10 may have only one specific heater 16 (the first specific heater 16a).

[0072] The specific examples of the present invention have been described in detail above, but these are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes techniques derived from various modifications and alterations of the specific examples described above. The technical elements illustrated in this specification or drawings are technically useful individually or in various combinations, and are not limited to the combinations described in the claims at the time of application. Furthermore, the technology illustrated in this specification or drawings can achieve multiple objectives simultaneously, and achieving even one objective is itself technically useful.

Claims

1. A heating device, wherein, The heating device has the following features: A plurality of heaters, each extending along a first direction, and the plurality of said heaters arranged along a second direction orthogonal to the first direction; A housing section that houses multiple of the aforementioned heaters; A supply flow path extends above the receiving portion along the first direction, and the supply flow path is for the flow of a heat medium supplied to the receiving portion; as well as A supply port that connects the supply flow path to the receiving section, and the supply port extends along the first direction. The supply flow path has a constriction section extending from its inlet side to its downstream side. The flow area of ​​the contraction section decreases as it moves from the inlet side of the supply flow path toward the downstream side.

2. The heating device according to claim 1, wherein, The flow area of ​​the contraction section is reduced by the reduction in the width of the supply flow path in the second direction.

3. The heating device according to claim 1 or 2, wherein, The flow area of ​​the contraction section is reduced by narrowing the width of the supply flow path in a third direction orthogonal to the first and second directions.

4. An electric vehicle, wherein, The electric vehicle is equipped with the heating device as described in claim 1 or 2.

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