WO2011086909A1

WO2011086909A1 - Heating device

Info

Publication number: WO2011086909A1
Application number: PCT/JP2011/000109
Authority: WO
Inventors: 和昌高田; 政人坪井; 公塚本
Original assignee: サンデン株式会社
Priority date: 2010-01-13
Filing date: 2011-01-13
Publication date: 2011-07-21
Also published as: JP2011143780A

Abstract

Provided are heating devices such that under a simple configuration, production costs can be reduced, and heat transfer efficiency and reliability can be increased. Each of the heating devices (1, 44, 50) is provided with a first housing (4) and a second housing (8), said first housing (4) containing heating elements (2) and having a holed end section (30) on the side where the heating elements (2) are contained, said second housing (8) containing the first housing (4) and having a flow path (6) formed between the second housing (8) and the first housing (4), and said flow path (6) serving as a flow passage for heating media of the heating elements (2). Each of the heating elements (2) has, at one end thereof, an end section (16) for establishing an external connection for the purpose of causing said each of the heating elements (2) to generate heat. A plurality of heating elements (2) are contained in the first housing (4). Said each of the heating elements (2) is contained in the first housing (4), with said end section (16) positioned on the side where the holed end section (30) is located.

Description

Heating device

The present invention relates to a heating device in which a heat medium of a heating element circulates.

In this type of heating device, a flat pipe is formed by embedding a flow pipe through which hot water as a heat medium flows and a heating wire heater (heating element) arranged in parallel with the flow pipe in a heat transfer metal. A heat transfer body is formed, a plurality of the heat transfer bodies are integrated, and circulation pipes are connected in series to constitute a heat source device (see, for example, Patent Document 1).

JP 2003-048422 A

Recently, the development and popularization of hybrid vehicles and electric vehicles has been promoted, and in the future, the waste heat of the engine cannot be fully utilized. Therefore, a heating device using the heating wire heater as described above is mounted on the vehicle. In the case of hybrid vehicles, as an auxiliary heat source that can supply heat so as to supplement the waste heat of the engine, in the case of electric vehicles, as an alternative heat source that can supply heat instead of the engine, the refrigeration circuit of the vehicle air conditioner It is expected to be used for heating the refrigerant circulating through

By the way, a heating wire heater inserts a coiled heating wire such as a nichrome wire into a bottomed cylindrical metal pipe, and pressurizes and fills the metal pipe with a heat-resistant insulating material having high electrical insulation and thermal conductivity. Then, it is formed by enclosing a heating wire. A terminal portion is provided at the opening of the metal pipe, and the terminal portion is connected to the heating wire and has a terminal protruding from the heating wire heater. Each terminal of each heating wire heater is electrically connected to an external power supply device, and constitutes an energization circuit for energizing the heating wire.

Here, in the above-described heating device of the prior art, no special consideration is given to connecting the terminals of each terminal portion of the heating wire heater to the energization circuit. Specifically, the heating wire heater is bent in a U-shape with a distribution pipe to form one heat transfer body, and a plurality of the heat transfer members are integrated. Each terminal of each heating wire heater is separated. Since it is not easy to connect each terminal to the energization circuit, there is a concern that the assembling property of the heating device may be deteriorated and the manufacturing cost may be increased.

In addition, since it is necessary to provide a heat insulating material that covers the heat transfer body between the case and the case provided outside the heat transfer body, the configuration of the heating device is spurred and the direct heating from the heat generating body to the case The heat transfer cannot be completely interrupted, and there is a risk of deteriorating the heat transfer efficiency of the heating device.
Furthermore, since it is necessary to connect the flow pipes in series, the heating device is further complicated, and the presence of a plurality of connection points in the heating device increases the risk of heat medium leakage, and the heating device There is also a problem that reliability may be impaired.

The present invention has been made based on the above-described circumstances, and an object of the present invention is to provide a heating device that can reduce the manufacturing cost with a simple configuration and can improve the heat transfer efficiency and the reliability.

In order to achieve the above object, a heating device of the present invention includes a first housing that houses a heating element, has an open end on the side where the heating element is housed, a first housing, And a second casing that forms a flow path through which the heat medium of the heating element flows between the casing and the heating element. A plurality of heating elements are accommodated in one casing, and each heating element is accommodated in the first casing with all ends positioned on the opening end side (claim 1).

Specifically, each end is fixed to the open end (claim 2).
Further, at least one of the outer surface of the first housing and the inner surface of the second housing is provided with a guide for guiding and flowing the heat medium in the flow path (Claim 3), and the guide is the second facing the guide. It is not in contact with the inner surface of the housing or the outer surface of the first housing. Specifically, a plurality of guides are provided by alternately shifting the height in a direction perpendicular to the longitudinal direction of the heating element (Claim 5), or the guides are continuously spiraled along the longitudinal direction of the heating element. (Claim 6).

Furthermore, a plurality of protrusions are provided on at least one of the outer surface of the first housing and the inner surface of the second housing, and each protrusion has an inner surface of the second housing facing the first housing or the first housing. The second casing has a heat medium inlet portion and an outlet portion in the vicinity of each apex that forms a diagonal in the longitudinal direction of the side surface thereof (non-contact with the outer surface of the casing) (Claim 7). Claim 8).
Furthermore, the end portion is a terminal portion that is energized to generate heat from the heating element, and the second housing has a heat medium inlet portion on the terminal portion side. Moreover, the control means which controls electricity supply with respect to each or several groups of terminal parts among several heat generating bodies is provided (Claim 10).

More specifically, the heating element is a heating wire heater (Claim 11), the heat medium is cooling water that circulates in a cooling water circuit to cool the heat source (Claim 12), and the heat source is This is a vehicle engine, and this cooling water circuit is provided in an air conditioner of the vehicle. Furthermore, the heat medium is a refrigerant circulating in the refrigeration circuit (Claim 14), and this refrigeration circuit is provided in an air conditioner of the vehicle (Claim 15). The heat medium is an antifreeze that circulates in the heating circuit.

According to the heating device of the first aspect of the present invention, the first casing is accommodated, the first casing having the opening end on the side where the heating element is accommodated and the heating element is accommodated. And a second casing that forms a flow path through which the heat medium of the heating element flows. The heating element has an end portion for external connection to heat the heating element at one end. A plurality of heating elements are accommodated in the casing, and each heating element is accommodated in the first casing with each end located on the opening end side. Thereby, in the heating device constituted by two units of the first and second housings, the end portions of the respective heating elements connected externally can be integrated and positioned at the opening end portions of the first housing. The external connection of each end can be easily performed collectively, and the assembly of the heating device can be improved and the manufacturing cost can be reduced.

Further, a flow path of the heat medium is formed between the two units, and direct heat transfer from the heating element to the second housing can be almost completely cut off, and the heat transfer efficiency of the heating device can be improved. .
Furthermore, since the flow path of the heat medium is formed between the two units, the number of connection portions of the flow path can be greatly reduced as compared with the case where the flow path is formed by a pipe or the like. The risk of leakage of the heat medium in can be reduced, and the reliability of the heating device can be improved.

According to the second aspect of the present invention, each end portion is fixed to the opening end portion, so that each end portion can be reliably integrated and positioned on the opening end portion of the first housing. The external connection can be made even more easily.

According to the third aspect of the present invention, at least one of the outer surface of the first housing and the inner surface of the second housing is provided with a guide for guiding and flowing the heat medium in the flow channel. In this case, the heat medium can flow smoothly and the heat transfer efficiency of the heating device can be increased.
According to the fourth aspect of the present invention, the guide is not in contact with the inner surface of the opposing second housing or the outer surface of the first housing, whereby direct heat from the heating element to the second housing is achieved. Transmission can be completely interrupted, and the heat transfer efficiency of the heating device can be increased.

According to the fifth aspect of the present invention, a plurality of guides are provided with the height being alternately shifted in the vertical direction with respect to the longitudinal direction of the heating element, so that the heat medium is directed along the guide in the longitudinal direction of the heating element. Since the flow path can be circulated while meandering and the substantial length of the flow path can be increased, it is possible to effectively increase the heat transfer time of the heat medium with respect to the first casing and, consequently, the heating element. Further, when the guide is formed in the first housing, the heat transfer area of the heat medium with respect to the first housing can be increased, so that the heat transfer efficiency of the heating device can be further increased.

According to the sixth aspect of the present invention, the guide is continuously provided in a spiral along the longitudinal direction of the heating element, so that the heat medium swirls spirally along the guide in the longitudinal direction of the heating element. However, since the substantial length of the flow path can be increased while flowing through the flow path, it is possible to effectively increase the heat transfer time of the heat medium with respect to the first casing and, consequently, the heating element. In addition, since the guide is formed in the first housing, the heat transfer area of the heat medium with respect to the first housing can be increased, so that the heat transfer efficiency of the heating device can be further increased.

According to the seventh aspect of the present invention, a plurality of protrusions are provided on at least one of the outer surface of the first housing and the inner surface of the second housing, and each protrusion is configured to face the second housing. Since the heat medium can be made to flow in a turbulent manner in the flow path and the substantial length of the flow path can be increased by not contacting the inner surface of the first housing or the outer surface of the first housing. It is possible to effectively increase the heat transfer time of the heat medium with respect to the housing and thus the heating element. Further, when the protrusion is formed on the first housing, the heat transfer area of the heat medium with respect to the first housing can also be increased, so that the heat transfer efficiency of the heating device can be further increased.

According to the eighth aspect of the present invention, the second casing has the inlet portion and the outlet portion of the heat medium in the vicinity of each apex that forms a diagonal in the longitudinal direction of the side surface thereof, so that the heat medium is the first heat medium. Since it flows smoothly over every corner in 2 housing | casings and the retention of the heat medium in a flow path can be prevented, the heat-transfer efficiency of a heating apparatus can further be improved.
According to the ninth aspect of the present invention, the end portion is a terminal portion that is energized to cause the heat generating element to generate heat, and the second casing has the inlet portion of the heat medium on the terminal portion side. The terminal portion can be cooled by a heat medium having a relatively low temperature before being heated by heat transfer from the heat transfer medium. Accordingly, since the heat resistance temperature of the terminal portion is generally lower than that of the heating element body, it is possible to prevent the terminal portion from reaching a temperature that the heating element emits, so that the durability of the heating element and the reliability of the heating device can be reduced. Can increase the sex.

According to the tenth aspect of the present invention, by providing control means for controlling energization of each of the plurality of heating elements or a plurality of terminal portions, the energization circuit of the heating device is made into a plurality of circuits and individually energized. Therefore, even if one energization line is disconnected, the heating device can be operated by another energization circuit. In addition, since the inrush current to the heating device can be reduced by energizing a plurality of terminals in stages when the heating device is started, and the overload trip of the heating device can be prevented, the reliability of the heating device is improved. Can do.

Specifically, the heating element is a heating wire heater, and the manufacturing cost of the heating device can be further reduced by using an inexpensive general-purpose heating wire heater. Since the heating wire heater is generally widely spread and has high reliability, the reliability of the heating device can be further improved.

Specifically, according to the invention described in claim 12, the heat medium is cooling water that circulates in a cooling water circuit to cool the heat source, and according to the invention described in claim 13, the heat source is a vehicle. This cooling water circuit is provided in the vehicle air conditioner. According to the invention described in claim 14, the heat medium is a refrigerant circulating in the refrigeration circuit. According to the invention described in claim 15, the refrigeration circuit is provided in the air conditioner of the vehicle. Furthermore, according to the invention described in claim 16, the heat medium is an antifreeze liquid circulating in the heating circuit. As described above, when the heating device is used as an auxiliary heat source or an alternative heat source for the engine, the cooling water circuit, the refrigeration circuit, and the air conditioner in which these circuits are provided, and the assembly of the vehicle in which the air conditioner is mounted is further improved. It is preferable because improvement and reduction in manufacturing cost can be achieved.

It is the perspective view which sees through and showed the side surface of the outer side case of the heating apparatus of 1st Example. It is a perspective longitudinal cross-sectional view of the heating wire heater of FIG. 1, and a figure which shows the external connection. It is a perspective view of the heat-transfer block of FIG. It is a longitudinal cross-sectional view of the outer case of FIG. It is a perspective view of the outer case of FIG. It is a longitudinal cross-sectional view of the outer case of FIG. It is the figure which showed the flow of the heat medium in the heating apparatus of FIG. It is the figure which showed the flow of the heat carrier in the heating apparatus of 2nd Example by making only the outer side case into the longitudinal cross-section. It is the figure which showed the flow of the heat medium in the heating apparatus of 3rd Example by making only the outer side case into a longitudinal cross-section.

1 to 7 show the heating apparatus of the first embodiment.
As shown in FIG. 1, the heating device 1 includes a heat transfer block (first housing) 4 in which four heating wire heaters (heating elements) 2 are accommodated, and a heat transfer block 4. And an outer case (second housing) 8 that forms a flow path 6 through which the heat medium of the heating wire heater 2 flows.

In the case of an electric vehicle, the heating device 1 is mounted on a vehicle such as a hybrid vehicle or an electric vehicle. In the case of a hybrid vehicle, the heating device 1 is used as an auxiliary heat source for supplying heat so as to compensate for waste heat that the engine (heat source) is insufficient. Is used as an alternative heat source for supplying heat in place of a non-existing engine for heating a refrigerant circulating in a refrigeration circuit of a vehicle air conditioner.
Specifically, in the case of a hybrid vehicle, LLC (cooling water, antifreeze liquid) circulating in the cooling water circuit to cool the engine in the flow path 6 flows as a heat medium and is heated by the heating wire heater 2. This cooling water circuit is provided in the vehicle air conditioner, and the heat of the LLC heated by the engine and the heating device 1 is used to heat the refrigerant circulating in the refrigeration circuit provided in the air conditioner. It becomes possible.

On the other hand, in the case of an electric vehicle, the refrigerant circulating in the refrigeration circuit flows through the flow path 6 as a heat medium and is heated by the heating wire heater 2. This refrigeration circuit is provided in the vehicle air conditioner in the same manner as described above, and the interior and exterior of the vehicle compartment can be cooled and heated by the heat of the refrigerant heated by the heating device 1. Further, water as a heat medium is circulated through the flow path 6, the water is heated by the heating wire heater 2, and the refrigerant circulating through the heating circuit of the vehicle air conditioner is heated using this hot water as an alternative heat source for the engine. It can also be used as a heat source for this purpose.
Furthermore, in both cases of a hybrid vehicle and an electric vehicle, the heating circuit 1 is provided with a heater core (not shown) in the heating circuit in which the antifreeze liquid circulates, and the heating device 1 is used as one of the heat sources of the antifreeze liquid and is heated by the heater core. It is also conceivable to blow air.

As shown in FIG. 2, in the heating wire heater 2, a coiled heating wire 12 such as a nichrome wire is inserted into a bottomed cylindrical metal pipe 10, and high electrical insulation and heat conduction are inserted into the metal pipe 10. It is formed by pressurizing and filling the heat-resistant insulating material 14 having a property and enclosing the heating wire 12. The heat-resistant insulating material 14 is, for example, magnesium oxide, and the main body of the heating wire heater 2 including the heat-resistant insulating material 14 and the metal pipe 10 has a heat-resistant temperature of about 1100 ° C.

The opening part of the metal pipe 10 is provided with a terminal part (end part) 16, and the terminal part 16 has a terminal 18 that is connected to the heating wire 12 and protrudes from the heating wire heater 2. Each terminal 18 of each heating wire heater 2 is electrically connected to an external power supply device 20 and constitutes an energization circuit 22 for energizing the heating wire 12. The terminal portion 16 is formed by casting and molding silicon, glass or the like in the opening of the metal pipe 10, and the terminal portion 16 has a heat resistant temperature of about 200 ° C. to 300 ° C. Instead of the terminal 18, a lead wire connected to the heating wire 12 may be drawn out from the terminal portion 16.

Further, the heating wire 12 of each heating wire heater 2 is provided with a thermal fuse (not shown) to protect each energizing circuit 22 from a large current exceeding the rating flowing through the heating wire 12, Prevents ignition. Further, a temperature sensor 24 such as a thermistor for detecting the temperature in the metal pipe 10 is drawn out from each terminal portion 18 of each heating wire heater 2.

Each temperature sensor 24 is electrically connected to an external electronic control unit (ECU) 26 that comprehensively controls the vehicle, and the power supply device 20 is also electrically connected to the ECU 26. The ECU 26 is individually connected to each of the four heating wire heaters 2 or a plurality of terminal portions 16 according to the temperature in each metal pipe 10 detected by each temperature sensor 24 via the power supply device 20. Energization control for energizing is performed (control means).

By performing this energization control, it becomes possible to energize the heating device 1 by making a plurality of energization circuits 22 individually. For example, even if one energization line 22 is disconnected, the other energization circuit 22 is energized and heated. The device 1 can be activated. Further, by energizing each terminal portion 16 stepwise when the heating device 1 is started, it is possible to reduce the inrush current to the heating device 1 and prevent the overload trip of the heating device 1.

3 and 4, the heat transfer block 4 is integrally formed as one unit by casting, for example, a metal having high heat resistance and heat conductivity. In the end surface 4a of the heat transfer block 4, four insertion holes 28 in which the heating wire heaters 2 are accommodated are opened at the end surface 4a so as to be gathered at substantially equal intervals, and a block opening end portion (first opening end portion) 30 is formed. Forming. The side surface (outer surface) 4 b of the heat transfer block 4 has a shape that is reduced to a strength range in which the insertion hole 28 can be formed in accordance with the shape of the metal pipe 10. The block opening end 30 may be formed separately from the main body of the heat transfer block 4, and these may be joined later to form a unit.

Here, each heating wire heater 2 inserted in each insertion hole 28 is joined and fixed to the block opening end portion 30 with an adhesive having high heat resistance and insulation at the terminal portion 16, which is apparent from FIG. 1. As described above, the end surface 16a of the terminal portion 16 and the end surface 30a of the block opening end portion 30 are flush with each other.
Moreover, the flange part 4c of the flange shape is formed in the block opening end part 30 over the perimeter, and the bolt insertion hole 32 penetrates and is formed in the four corners of the flange part 4c.

Furthermore, on the side surface 4 b of the heat transfer block 4, convex guides 34 are formed integrally with the heat transfer block 4 so as to guide and flow the heat medium from an inlet 40 to an outlet 42 described later. The guide 34 has a protruding height that does not contact the inner surface 8a of the outer case 8 with a gap of about 0.5 mm from the inner surface 8a of the outer case 8 in a state where the heat transfer block 4 is accommodated in the outer case 8. In this embodiment, two guides 34 are provided with their heights alternately shifted in the direction perpendicular to the longitudinal direction of the heating wire heater 2.

Further, each insertion hole 28 has a hole diameter that is approximately the same as or slightly larger than the outer diameter of the metal pipe 10 and is formed in a circular deep hole shape so that the terminal portion 16 is positioned at the block opening end 30. Thus, when each metal pipe 10 is inserted into the insertion hole 28, the metal pipe 10 is appropriately brought into contact with the insertion hole 28, and the heat generated by the heating wire heater 2 is smoothly transmitted to the heat transfer block 4.
On the other hand, as shown in FIGS. 5 and 6, the outer case 8 is integrally formed as one unit by casting metal, for example, and can accommodate the heat transfer block 4, and the side surface of the heat transfer block 4. 4b and the inner surface 8a of the outer case 8 have a volume capable of forming a clearance constituting the heat medium flow path 6. A case opening end portion (second opening end portion) 36 having an opening hole 8e for inserting the heat transfer block 4 is formed on the end surface 8b of the outer case 8 on the side where the heat transfer block 4 is accommodated. ing.

The case opening end portion 36 is formed in a size that allows the heat transfer block 4 to be inserted into the outer case 8, and the back surface 4 d of the flange portion 4 c covers the entire circumference in a state where the heat transfer block 4 is accommodated in the outer case 8. And has a shape that comes into contact with the case opening end 36. Bolt holes 38 are formed at the four corners of the case opening end 36 at positions that match the bolt insertion holes 32 in a state where the heat transfer block 4 is accommodated in the outer case 8. That is, the flange portion 4c is bolted and joined to the case opening end portion 36 so that the heat transfer block 4 and the outer case 8 are joined only at the respective opening

end portions

30 and 36, in other words, heat transfer. The block 4 is fixed to the outer case 8 in a non-contact state except for the case opening end portion 36.

Further, when the side surface 8c of the outer case 8 is on the case opening end 36 side, that is, when the heat transfer block 4 is accommodated in the outer case 8, the heat medium inlet 40 is formed in a pipe shape at the end on the terminal 16 side. It is projecting. On the other hand, at the end of the side surface 8c of the outer case 8 opposite to the case opening end portion 36, on the side of the bottom portion 8d, the outlet portion 42 of the heat medium projects in a pipe shape substantially diagonally to the inlet portion 40 of the side surface 8c. It is installed. That is, the inlet part 40 and the outlet part 42 are provided in the vicinity of each apex that forms a diagonal in the longitudinal direction of the side surface 8c.

As shown in FIG. 7, in the heating apparatus 1 of the first embodiment, two guides 34 are provided with their heights alternately shifted in the vertical direction with respect to the longitudinal direction of the heating wire heater 2. In FIG. 7, the height of the guide 34 on the front side is lowered when the height of the guide 34 on the back side opposite to the front side is higher than the height of the guide 34 on one back side. When the height of the guide 34 on the back side is lower than the height of the one guide 34 on the back side, the height is increased. As a result, as shown by solid line arrows and broken line arrows in FIG. 7 (the flow of the heat medium on the back side of the heat transfer block 4 is indicated by broken line arrows), the heat medium flows along the guides 34 of the heating wire heater 2. It flows through the flow path 6 while meandering in the longitudinal direction, that is, from the inlet 40 toward the outlet 42.

The heating device 1 of the first embodiment described above is composed of two units of the heat transfer block 4 and the outer case 8, and each terminal portion 16 of each heating wire heater 2 connected to the energization circuit 22 is connected to the end portion of the block opening. 30 can be integrated and positioned, the connection of each terminal portion 16 to the energization circuit 22 can be easily performed collectively, and the assembly of the heating device 1 can be improved and the manufacturing cost can be reduced. Can be realized.

Further, the terminal portion 16 is fixed to the block opening end portion 30, and the end surfaces 16 a and 30 a of each terminal portion 16 and the block opening end portion 30 are flush with each other, so that each terminal portion 16 becomes the block opening end portion 30. The terminals can be reliably integrated and positioned, and the connection of the terminal portions 16 to the energization circuit 22 can be further easily performed.

Furthermore, the flow path 6 for the heat medium is formed between the two

units

4 and 8, so that the number of connection points of the flow path 6 is significantly reduced as compared with the case where the flow path 6 is formed of a pipe or the like. be able to. Specifically, the heat transfer block 4 and the outer case 6 are joined only by the opening

end portions

30 and 36 with a simple configuration in which the flange portion 4c is provided at the block opening end portion 30 of the heat transfer block 4. Therefore, the assembling property of the heating device 1 can be further improved, and the manufacturing cost can be reduced.

Furthermore, the heat medium flow path 6 is formed between the two

units

4 and 8, and the direct heat transfer from the heating wire heater 2 to the outer case 8 is almost completely cut off without the need for a heat insulating material. Since the heat of the heating wire heater 2 can be transmitted to the heat medium, the heat transfer efficiency of the heating device 1 can be increased.
Moreover, since the flow path 6 can be formed by joining one place of each

opening end part

30 and 36 of the said two

units

4 and 8 via sealing materials, such as a metal gasket material of a double-sided rubber coating, The risk of heat medium leakage in the heating device 1 can be reduced, and the reliability of the heating device 1 can be increased.

Furthermore, by providing the heat transfer block 4 with a guide 34 that is not in contact with the inner surface 8a of the outer case 8, direct heat transfer from the heat transfer block 4 to the outer case 8 is completely blocked, and the heat medium is removed. It is possible to smoothly flow from the inlet 40 to the outlet 42 of the flow path 6. Specifically, the heat medium flows along the guide 34 in a spiral direction from the longitudinal direction of the heating wire heater 2, that is, from the inlet portion 40 toward the outlet portion 42, so that the substantial length of the passage 6 is increased. Since the length can be increased, the heat transfer time of the heat medium to the heat transfer block 4 and, consequently, the heating wire heater 2 can be effectively increased. Moreover, since the guide 34 is formed in the heat transfer block 4, the heat transfer area of the heat medium with respect to the heat transfer block 4 can also be increased, so that the heat transfer efficiency of the heating device 1 can be increased.

In addition, since the inlet portion 40 and the outlet portion 42 are respectively provided in the vicinity of the tops that are diagonal to the longitudinal direction of the side surface 8 c of the outer case 8, the heat medium is smoothly spread over the corners of the outer case 8. Therefore, the heat transfer efficiency of the heating device 1 can be further increased.

Furthermore, by providing the heat medium inlet 40 on the case opening end 36 side of the outer case 8, that is, on the terminal 16 side, the temperature becomes relatively low before being heated by heat transfer from the heating wire heater 2. The terminal portion 16 can be cooled with a heat medium. Therefore, as described above, since the terminal portion 16 has a lower heat-resistant temperature than the main body of the heating wire heater 2, it is possible to prevent the terminal portion 16 from reaching a temperature generated by the heating wire 12. As a result, the reliability of the heating device 1 can be improved.

In addition, by accommodating a plurality of heating wire heaters 2 in the heat transfer block 4, it is possible to more effectively increase the heat transfer time and heat transfer area of the heat medium to the heat transfer block 4, and consequently the heating wire heater 2. The heat transfer efficiency of the heating device 1 can be further increased.
Furthermore, by performing energization control for controlling whether or not the plurality of heating wire heaters 2 are energized, the energization circuit 22 of the heating device 1 can be made into a plurality of circuits and individually energized. Even if it does, the heating apparatus 1 can be operated with the other electricity supply circuit 22. FIG. Furthermore, since the inrush current with respect to the heating device 1 can be reduced by energizing the plurality of terminal portions 16 in stages when the heating device 1 is started, an overload trip of the heating device 1 can be prevented. Reliability can be further increased.

FIG. 8 shows the heating device 44 of the second embodiment.
The heat transfer block 46 constituting the heating device 44 of the second embodiment is integrally formed with a convex guide 48 having a protruding height similar to that of the guide 34 of the first embodiment on the side surface 4b. The guide 48 of the present embodiment is continuously provided in a spiral shape along the longitudinal direction of the heating wire heater 2, and as shown by a solid line arrow and a broken line arrow in FIG. 8 (on the back side of the heat transfer block 46). The heat medium flows in the flow path 6 while spirally turning along the guide 48 along the guide 48 in the longitudinal direction of the heating wire heater 2, that is, from the inlet 40 to the outlet 42. To do.

In the case of the second embodiment, since the substantial length of the flow path 6 can be further increased as compared with the guide 34 of the first embodiment, the heat transfer block 46, and consequently the heating wire heater 2 The heat transfer time of the heat medium can be increased more effectively. Moreover, since the guide 48 is formed in the heat transfer block 46, the heat transfer area of the heat medium with respect to the heat transfer block 46 can also be increased, so that the heat transfer efficiency of the heating device 1 can be further increased.

FIG. 9 shows the heating device 50 of the third embodiment. In the heat transfer block 52 constituting the heating device 50 of the third embodiment, in addition to the guide 34 of the first embodiment, a plurality of protrusions 54 having a projection height similar to the guide 34 are arranged in a non-linear manner. It is integrally formed with.

In the case of this third embodiment, as shown by the solid line arrow in FIG. 9 (the flow of the heat medium on the back side of the heat transfer block 52 is the same as that on the front side and is omitted), the projection 54 is Compared to the case where only the guide 34 of the first embodiment is provided by circulating the heat medium in the flow path 6 in a turbulent manner, the substantial length of the flow path 6 can be further increased. The heat transfer time of the heat medium with respect to the block 52, and by extension, the heating wire heater 2, can be further increased effectively.

Further, by forming the protrusion 54 on the heat transfer block 52, the heat transfer area of the heat medium to the heat transfer block 52 can be further increased as compared with the case where only the guide 34 of the first embodiment is provided. Therefore, the heat transfer efficiency of the heating device 1 can be further increased. It should be noted that the same effect can be obtained by providing a similar protrusion 54 on the heat transfer block 46 of the second embodiment.

The present invention is not limited to the above-described embodiments, and various modifications can be made.
Specifically, in the

heating devices

1, 44, and 50 of the present invention, the four heating wire heaters 2 are accommodated in the heat transfer blocks 4, 46, and 52. The energization control for the heater 2 is possible. Further, the numbers and shapes of the

guides

34 and 48 and the protrusions 54 are not limited to those of the above embodiment.

In addition, the

guides

34 and 48 and the protrusion 54 are provided on the outer surfaces of the heat transfer blocks 4, 46 and 52, respectively, but are not limited thereto, and may be provided on the inner surface 8 a of the outer case 8. In this case, direct heat transfer from the heat transfer block 4 to the outer case 8 is completely achieved by disengaging the

guides

34, 48 and the protrusions 54 from the outer surfaces of the heat transfer blocks 4, 46, 52. The heat medium can be smoothly flowed from the inlet 40 to the outlet 42 of the flow path 6 while being blocked, and the heat transfer efficiency of the heating device 1 can be increased.
However, if the

guides

34, 48 and the protrusions 54 are provided on the outer surfaces of the heat transfer blocks 4, 46, 52, respectively, the processing accuracy when the

guides

34, 48 and the protrusions 54 are manufactured by casting can be increased. It is advantageous.

In addition, a heating element other than the heating wire heater 2 can be applied to the

heating devices

1, 44, and 50 of the present invention, or a fluid other than water may be used as a heat medium. However, the manufacturing cost of the

heating devices

1, 44, 50 can be reduced by using an inexpensive general-purpose heating wire heater 2, and the general-purpose heating wire heater 2 is generally widely spread and highly reliable. The reliability of the

heating devices

1, 44, 50 can be improved, which is preferable.

Furthermore, by incorporating the

heating device

1, 44, 50 of the present invention into a vehicle air conditioner for a hybrid vehicle or an electric vehicle, a cooling water circuit, a refrigeration circuit, and thus an air conditioner provided with these circuits, and thus this air conditioner It is preferable because the assembling property of the vehicle to be mounted can be improved and the manufacturing cost can be reduced. Of course, the

heating devices

1, 44, 50 can be used not only in the vehicle air conditioner but also as a heat source for other purposes.

1,44,50 Heating device 2 Heating wire heater (heating element)
4 Heat transfer block (first housing)
4b Side (outside)
6 Flow path 8 Outer case (second housing)

8a Inner surface

8c Side surface 16 Terminal (end)
16a End face 26 ECU (control means)
30 Block opening end (first opening end)

30a End face

34, 48 Guide 36 Case opening end (second opening end)
40 Inlet part 42 Outlet part 54 Projection part

Claims

A first housing containing a heating element and having an open end on a side where the heating element is housed;
A second housing that houses the first housing and forms a flow path through which a heat medium of the heating element flows between the first housing and the first housing;
The heating element has at one end an end for externally connecting the heating element to generate heat,
A plurality of the heating elements are accommodated in the first casing, and each of the heating elements is accommodated in the first casing with all the end portions positioned on the opening end side. Heating device.
The heating device according to claim 1, wherein each end is fixed to the opening end.
The guide according to claim 1 or 2, wherein at least one of an outer surface of the first housing and an inner surface of the second housing is provided to guide and flow the heat medium in the flow path. The heating device described.
The heating apparatus according to claim 3, wherein the guide is not in contact with the inner surface of the second housing or the outer surface of the first housing which faces the guide.
The heating apparatus according to claim 4, wherein a plurality of the guides are provided by alternately shifting the height in a direction perpendicular to the longitudinal direction of the heating element.
The heating device according to claim 4, wherein the guide is continuously provided in a spiral shape along a longitudinal direction of the heating element.
A plurality of protrusions are provided on at least one of the outer surface of the first housing and the inner surface of the second housing, and each protrusion has an inner surface of the opposing second housing or the first housing. The heating device according to any one of claims 1 to 6, wherein the heating device is not in contact with an outer surface of one housing.
The said second housing has an inlet portion and an outlet portion for the heat medium, respectively, in the vicinity of each apex that forms a diagonal in the longitudinal direction of the side surface thereof. Heating device.
The end portion is a terminal portion that is energized to heat the heating element,
The heating apparatus according to any one of claims 1 to 8, wherein the second casing has an inlet portion for the heat medium on the terminal portion side.
The heating apparatus according to claim 9, further comprising a control unit that controls energization of each of the plurality of heating elements or a plurality of the terminal portions.
The heating device according to any one of claims 1 to 10, wherein the heating element is a heating wire heater.
The heating apparatus according to any one of claims 1 to 11, wherein the heat medium is cooling water circulating in a cooling water circuit to cool the heat source.
The heating device according to claim 12, wherein the heat source is an engine of a vehicle, and the cooling water circuit is provided in an air conditioner of the vehicle.
The heating apparatus according to any one of claims 1 to 11, wherein the heat medium is a refrigerant circulating in a refrigeration circuit.
The heating apparatus according to claim 14, wherein the refrigeration circuit is provided in an air conditioner of a vehicle.
12. The heating apparatus according to claim 1, wherein the heat medium is an antifreeze liquid circulating in a heating circuit.