JP2008032292A - Heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating device capable of efficiently heating fluid. <P>SOLUTION: This heating device comprises a hollow case 3, first and second ports 4, 5 disposed on one end portion 3a of the case 3, a coiled sheath heater 6 extending between one end portion 3a and the other end portion 3b of the case 3 inside of the case 3, and a pipe 7 disposed inside of the case 3 in a state of being inserted into the sheath heater 6. One end portion 7a of the pipe 7 is connected to the first port 4, and the other end portion 7b of the pipe 7 communicates with the second port 5 through the inside of the case 3 opened at the other end portion 3b of the case 3. Accordingly, the fluid flowing to the inside of the case 3 from one of the ports 4, 5 is reciprocated inside and outside of the pipe 7 (pipe inner flow channel 11 and pipe outer flow channel 12) inside of the case 3, and the fluid can be heated by the sheath heater 6 in the going way and the returning way. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heating device including a sheathed heater.

  2. Description of the Related Art Conventionally, for example, a heating device having a configuration in which a coiled sheathed heater is disposed in a case has been used as a heat source for a heating device of an electric vehicle (see, for example, Patent Document 1).

As such a heating apparatus, there is known a configuration in which a sheathed heater is provided in a case and a pair of ports facing each other are provided in the case. In this heating device, the fluid supplied to the case from one port is heated by a sheathed heater, and the heated fluid is discharged from the other port.
Japanese Patent Laid-Open No. 11-245655

  However, in the case of such a heating device, since fluid flows linearly from one port to the other, fluid stagnation occurs around the linear flow, and the fluid is heated by the sheathed heater. There is a problem of inefficiency.

  Then, an object of this invention is to provide the heating apparatus which can heat a fluid efficiently.

  The heating device of the present invention includes a hollow case for receiving fluid, first and second ports provided at one end of the case and communicating with the inside and outside of the case, and the one end of the case inside the case. A coiled sheathed heater that heats the fluid in the case and is inserted into the sheathed heater, and is disposed inside the case, and has one end portion that is And a pipe having the other end opened at the other end of the case and communicated with the second port through the inside of the case. Features.

  According to the present invention, the fluid that has flowed into the case from one port is reciprocated inside and outside the pipe inside and outside the pipe (flow path inside the pipe, flow path outside the pipe), and the fluid is seeded between the forward path and the return path. Since it can heat with a heater, a fluid can be heated efficiently.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal side view showing the heating device of the present embodiment. In addition, the arrow in drawing shows the flow of the fluid roughly.

  As shown in FIG. 1, the heating device 1 includes two heating units 2 that are stacked one above the other. In general, the heating device 1 is configured such that after the fluid flowing into the lower heating unit 2 is heated by the lower heating unit 2, the fluid is further heated by the upper heating unit 2 and then the upper heating unit 2. It is what is discharged from. The heating device 1 is provided as a heat source, for example, in an automotive heating device.

  Here, the heating device of the automobile supplies the fluid heated by the heating device 1 to a heater core (none of which is shown) by the operation of the pump, warms the air by the heat of the fluid in the heater core, and the heated air It is a thing of the structure supplied to. The fluid after warming the air is supplied again to the heating device 1 by the operation of the pump. As the fluid, a liquid such as LLC (Long Life Coolant) is used. Such a heating device is used, for example, for main heating of an electric vehicle or auxiliary heating for a diesel engine vehicle.

  Next, each part of the heating apparatus 1 will be described in detail. Since the pair of upper and lower heating units 2 have the same configuration, the lower heating unit 2 of the two heating units 2 will be described here. The heating unit 2 includes a hollow case 3 that receives a fluid, first and second ports 4 and 5 provided in the case 3, a sheathed heater 6 and a pipe 7 disposed in the case 3, and the like. Has been.

  The case 3 includes a cylindrical portion 8 and a pair of closed walls 9 that close both ends of the cylindrical portion 8. Here, the case 3 of the upper heating unit 2 and the case 3 of the lower heating unit 2 are integrated.

  The first port 4 is formed in a pipe shape, and is provided through the closing wall 9 at one end 3 a of the case 3.

  The second port 5 is configured by a hole formed through the upper portion of the cylindrical portion 8 in the one end portion 3 a of the case 3. The second port 5 of the lower heating unit 2 and the second port 5 of the upper heating unit 2 communicate with each other.

  The sheathed heater 6 extends between the one end 3 a and the other end 3 b of the case 3 inside the case 3 and heats the fluid in the case 3. The sheathed heater 6 is formed in a coil shape, and lead terminals 10 are connected to both ends thereof. The lead terminal 10 passes through the cylindrical portion 8 of the case 3. Specifically, the sheathed heater 6 has a configuration in which a heating element such as a coiled nichrome wire is inserted into the protective tube, and a heat-resistant insulator is filled between the heating element and the protective tube. Yes. In the sheathed heater 6, the heating element generates heat by electric power supplied from a vehicle power source (not shown) via the lead terminal 10.

  The pipe 7 is made of metal and is formed in a cylindrical shape, and is disposed inside the case 3 in a state of being inserted into the sheathed heater 6. One end 7 a of the pipe 7 is connected to the first port 4. Specifically, the pipe 7 is integrally formed with the first port 4. On the other hand, the other end 7 b of the pipe 7 is opened in a state of facing the inner surface of the closing wall 9 of the other end 3 b of the case 3 and communicates with the second port 5 through the inside of the case 3. . The diameter of the pipe 7 increases as it goes from the one end 3a of the case 3 to the other end 3b. By this pipe 7, a pipe internal flow path 11 inside the pipe 7 and a pipe external flow path 12 outside the pipe 7 are formed inside the case 3.

  The flow of the fluid in the heating apparatus 1 having such a configuration will be described. First, the flow of fluid in the lower heating unit 2 will be described. The fluid supplied to the first port 4 of the lower heating unit 2 by a pump (not shown) flows from the one end 3 a of the case 3 to the other end 3 b along the pipe flow path 11, and the other end of the pipe 7. It flows out from the part 7b. Then, the fluid is changed in the flow direction at the other end 3 b of the case 3, and flows along the pipe outer flow path 12 from the other end 3 b of the case 3 to the one end 3 a. Then, the fluid flows out from the second port 5 to the second 5 of the upper case 3 at the one end 3 a of the case 3.

  Next, in the upper heating unit 2, the fluid flows into the case 3 from the second port 5 and flows along the pipe outer flow path 12 from the one end 3 a to the other end 3 b of the case 3. Then, the fluid is changed in the flow direction in the opposite direction at the other end 3 b of the case 3 and flows into the pipe 7. Then, the fluid flows from the other end 3 b of the case 3 to the one end 3 a along the in-pipe flow path 11 and flows out from the first port 4.

  Thus, the fluid flowing inside each case 3 is heated by the energized sheathed heater 6 in the in-pipe flow path 11 and the pipe external flow path 12. At this time, particularly in the pipe outer flow path 12, since the sheathed heater 6 exists in the flow path 12, the fluid flows while touching the outer surface of the sheathed heater 6.

  As described above, in the present embodiment, in the case 3, the fluid is reciprocated along the sheathed heater 6 inside and outside the pipe 7 (in-pipe channel 11, pipe-external channel 12), and the forward path and the return path thereof. Thus, the fluid can be heated by the sheathed heater 6. Therefore, it is possible to suppress the occurrence of stagnation of the fluid inside the case 3, and it is possible to efficiently heat the fluid. In particular, in the pipe external flow path 12 located outside the pipe 7, the sheathed heater 6 exists in the flow path 12 and the fluid flows while touching the outer surface of the sheathed heater 6. It can be transmitted efficiently. Therefore, the fluid can be efficiently heated by the sheathed heater 6.

  Further, in the present embodiment, it is possible to suppress the occurrence of fluid stagnation inside the case 3 as described above, that is, the fluid can be smoothly moved inside the case 3. The occurrence of local boiling inside can be suppressed, and as a result, the durability of the heating device 1 can be improved.

  Moreover, in this embodiment, the pipe 7 can suppress the fluid flow from being disturbed because the diameter of the pipe 7 increases from the one end 3 a to the other end 3 b of the case 3.

  Moreover, in this embodiment, since the two heating parts 2 are provided, the energization to the two sheathed heaters 6 can be independently controlled for each sheathed heater 6 by a control circuit (not shown). Therefore, by driving the sheathed heater 6 according to the amount of heat necessary for heating, wasteful energy consumption can be suppressed.

  The present invention is not limited to the above-described embodiment, and various other embodiments can be adopted without departing from the gist of the present invention. For example, in the above-described embodiment, an example in which two heating units 2 are provided has been described, but one heating unit 2 may be provided.

It is a vertical side view which shows the heating apparatus of one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating device 2 Heating part 3 Case 3a One end part of case 3b Other end part of case 4 1st port 5 2nd port 6 Seeds heater 7 Pipe 7a One end part of pipe 7b The other end part of a pipe

Claims (3)

A hollow case (3) for receiving fluid;
First and second ports (4, 5) provided at one end (3a) of the case (3) and communicating between the inside and outside of the case (3);
A coiled sheath that extends between the one end (3a) and the other end (3b) of the case (3) and heats the fluid in the case (3) inside the case (3). A heater (6);
The sheath (6) is inserted into the case (3) while being inserted into the case heater (6). One end (7a) is connected to the first port (4), while the other end (7b). A pipe (7) that is opened at the other end (3b) of the case (3) and communicates with the second port (5) through the inside of the case (3);
A heating device comprising:   The heating device according to claim 1, wherein the pipe (7) has a diameter that increases from the one end (3a) to the other end (3b) of the case (3). The case (3), the first port (4), the second port (5), the sheathed heater (6) and the pipe (7) constitute a heating unit (2),
Two heating units (2) are provided,
These heating parts (2) are heating devices according to claim 1 or 2 with which said 2nd ports (5) communicate.

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