JPH10147138A - Heating device for electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accomplish heating without any fluctuation in heating ability, due to an outside air temperature by means of an inexpensive device by constructing a heater circuit of a hot water heater connected to a power source, a circulating pump, a heat exchanger provided in a heater unit arranged in the vehicle interior. SOLUTION: When a switch 13 is turned on for operating a heating device, electric power is fed from a power source 12 to an electric heating wire 9 in a hot water heater 6, and circulating water is heated by means of the heat generated by the electric heating wire 9. In this process, the heated circulating water is circulated between the hot water heater 6 and a heat exchanger 3 via pipes 10, 11 when a circulating pump 7 is driven by means of a motor 8, so that the inside of the heat exchanger 3 is also filled with the hot circulating water. when a blower motor 4 is operated in this condition, air sucked by the blower motor 4 is heated by means of the heat exchanger 3 inside the heater unit 2 and discharge from a duct 5 into the interior so as to heat it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device for an electric vehicle.

[0002]

2. Description of the Related Art As a heating device for an electric vehicle, a system using a PTC heater as a heat source as shown in FIG. 4 or a heat pump type heating device as shown in FIG. 5 or JP-A-4-46818 is used. ing. In a heating device using a PTC heater, a PTC heater 15 is provided in a heater unit 14. During heating, the power supply (not shown)
Electric power is supplied to the TC heater 15 to cause the PTC heater 15 to generate heat. As a result, the air sucked by the blower motor 16 passes through the heated PTC heater 15 and is then heated and released into the vehicle interior as heating air, so that a heating effect can be obtained. However, the P
In a heating device using a TC heater, the PTC heater 1
5 requires a power supply to generate heat, so that the PTC heater 15 built in the heater unit 14 in the vehicle interior is used.
And a power supply provided outside the cabin must be connected by wiring. For this reason, panels that separate the interior and exterior of the vehicle
It is necessary to make a hole for passing the wiring, which is not preferable for maintaining waterproofness or soundproofness in the vehicle interior. The heat pump type heating device is a system including a heater unit 18 having a built-in heat exchanger 17, a compressor 19, a four-way switching valve 20, an outdoor heat exchanger and a decompressor (not shown), and a pipe 21 connecting these. In addition, a heating effect is obtained by heat exchange between a refrigerant circulating in the system and air.
In the case of using the heat pump type heating device, the components of the system are complicated and large in number, so in a hood having a large number of other mounting devices such as an electric motor and a controller, without deteriorating the performance of the heating device. It is quite difficult to install. There is also a problem that when the outside air temperature is low, the heating performance is reduced.

[0003]

DISCLOSURE OF THE INVENTION The present invention is concerned with the problem of lowering the waterproofness and soundproofing of the vehicle interior due to the perforation of a hole through which wiring is passed through a panel that separates the interior and exterior of the vehicle interior, and the layout problem. The present invention provides a heating system having a high heating performance with a simple system without lowering the heating performance.

[0004]

To achieve the above object, the present invention provides a hot water heater connected to a power supply, a circulation pump, and a heat exchanger provided in a heater unit installed in a vehicle compartment. And a heater circuit constituted by a heater.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a conceptual perspective view showing a mounting position of a part of a heating device of an electric vehicle using the present invention, FIG. 2 is a perspective view showing a part of the heating device, and FIG. 3 is a heating device. FIG.

The heating device of the electric vehicle 1 includes a heater unit 2 having a built-in heat exchanger (heater core) 3, a blower motor 4, a duct 5 connecting the heater unit 2 and the blower motor 4, a circulation pump 7 and the pump. A hot water heater 6 containing a drive motor 8 and a heating wire 9 for warming circulating water, two pipes 10 and 11 connecting the hot water heater 6 and the heat exchanger 3, and a power supply for the heating wire 9 12, the power supply 1
2 comprises a switch 13 for turning on and off the supply of power. The circulating water is injected into a heater circuit including the hot water heater 6, the heater unit 2, and the pipes 10 and 11. The heater unit 2 and the blower motor 4 are provided in a vehicle interior similarly to a general automobile. The hot water heater 6 is installed in a hood at the front of the vehicle compartment, and the power supply 12 is installed at an arbitrary place in the vehicle, not shown. As the circulating water, the same antifreeze as that of a general gasoline engine vehicle is used.

[0007] The operating principle of the heating device configured as described above will be described as follows. First, when the switch 13 is turned on, electric power is supplied from the power supply 12 to the heating wire 9 and the heating wire 9 is warmed. Thereby, the circulating water is warmed, and the circulating pump 7 is driven by the motor 8 so that the warmed circulating water flows between the hot water heater 6 and the heat exchanger 3 through the piping. The heat exchanger 3 is circulated through 10 and 11
The inside will be filled with warm circulating water. When the blower motor 4 is operated in this state, the air sucked by the blower motor 4 is discharged from a duct (not shown) into the vehicle compartment after being heated by the heat exchanger 3 in the heater unit 2. Therefore, the cabin will be warmed.

[0008]

The heating effect is obtained by warming the circulating water with the hot water heater, so that the heating capacity is not affected by the outside temperature unlike the heat pump type heating device. Since the main components for heating need only be a hot water heater and a power supply in addition to the heater unit and the blower motor, the system is simpler, the cost is lower, and the reliability is higher than that of a heat pump type heating device. Since the hot water heater has no restrictions on mounting in the hood, it is easy to coexist with many devices mounted in the hood such as an electric motor for driving a vehicle, a controller, and a suspension. In addition, once the entire inside of the heater circuit is warmed, the refrigerant in the circuit always keeps the liquid, so it is difficult to cool, and even if the supply of electric power to the heating wire is stopped, there is no immediate heating air in the vehicle interior. There is no.

[Brief description of the drawings]

FIG. 1 is a conceptual perspective view showing a mounting position of a part of a heating device of an electric vehicle using the present invention.

FIG. 2 is a perspective view illustrating a part of a heating device according to the present invention.

FIG. 3 is a system diagram of the heating device of the present invention.

FIG. 4 is a conventional example of a heating device using a PTC heater.

FIG. 5 shows another conventional example, which is a heat pump type heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric vehicle 2 Heater unit 3 Heat exchanger 4 Blower motor 5 Duct 6 Hot water heater 7 Circulation pump 8 Pump drive motor 9 Heating wire 10 Piping 11 Piping 12 Power supply 13 Switch

Claims (2)

[Claims] 1. A heating device for an electric vehicle, comprising: a heater circuit including a hot water heater connected to a power supply, a circulation pump, and a heat exchanger provided in a heater unit installed in the passenger compartment. A heating device for an electric vehicle. 2. The heater, the circulation pump, and the heat exchanger are connected by a pipe, and a liquid is passed through the pipe.
The heating device for an electric vehicle according to claim 1, wherein the liquid is circulated in the heater circuit by the pump.