JP5645617B2 - Heating medium heating device - Google Patents

Description

  The present invention relates to a heat medium heating device suitable for being mounted on an electric vehicle (for example, an electric bus) using electric energy as a power source.

  In an electric vehicle using electric energy as a power source, the interior of the vehicle cannot be heated using engine cooling water. For example, a plurality of PTC (Positive Temperature Coefficient) heaters disclosed in Patent Document 1 are used. The interior of the vehicle is heated using a heat medium heating device.

JP 2008-56044 A

  However, in the heat medium heating apparatus using a plurality of PTC heaters, outlet temperature sensors for measuring the temperature of (warm) water flowing out of the PTC heater are provided at the outlets of the PTC heaters. An inlet temperature sensor for measuring the temperature of (warm) water flowing into the PTC heater is provided at each inlet of the PTC heater. Therefore, the number of electric wires that transmit the measured values measured by the outlet temperature sensor and the inlet sensor to the heater controller, and the number of terminals (connection points) to which these electric wires are connected (connected) become very large, and the heat medium There was a problem that the heating device would be enlarged.

  This invention is made | formed in view of such a situation, Comprising: It aims at providing the heat medium heating apparatus which can aim at simplification, size reduction, and weight reduction of an electric wire and a terminal.

The present invention employs the following means in order to solve the above problems.
The heating medium heating device according to the present invention includes an outlet temperature sensor that measures the temperature of water flowing out,
A heating medium heating device comprising a plurality of electric heaters equipped with an inlet temperature sensor for measuring the temperature of incoming water, wherein the outlet electric wire transmits the measured value to all of the outlet temperature sensors. Is connected, and only one of the inlet temperature sensors is connected to an inlet wire that transmits a measured value, and the other end of the outlet wire and the other end of the inlet wire are connected to the heater controller, respectively. Is done .

According to the heat medium heating device of the present invention, among the plurality of inlet temperature sensors, an electric wire that transmits a measured value to only one inlet temperature sensor is connected, and the other inlet temperature sensors have a measurement. The electric wire that transmits the measured value is not connected.
Thereby, simplification of an electric wire and a terminal can be achieved, and size reduction and weight reduction can be achieved.

  The heating device for an electric vehicle according to the present invention includes the above-described heating medium heating device.

The electric vehicle heating device according to the present invention includes the heat medium heating device in which the electric wires and terminals are simplified, downsized, and lightened.
Thereby, size reduction and weight reduction of the said heating apparatus for electric vehicles can be achieved.

  An electric vehicle according to the present invention includes the above-described heating device for an electric vehicle.

The electric vehicle according to the present invention includes the electric vehicle heating device that is reduced in size and weight.
As a result, the electric vehicle can be reduced in size and weight.

  According to the heat medium heating device of the present invention, there is an effect that the electric wire and the terminal can be simplified, reduced in size, and reduced in weight.

1 is a schematic overall perspective view of an electric vehicle equipped with an electric vehicle heating device according to an embodiment of the present invention. It is a schematic block diagram of the heating apparatus for electric vehicles which concerns on one Embodiment of this invention. It is a circuit diagram of the heating device for electric vehicles concerning one embodiment of the present invention.

Hereinafter, one embodiment of a heating device for an electric vehicle according to the present invention will be described with reference to FIGS. 1 to 3.
1 is a schematic overall perspective view of an electric vehicle equipped with a heating device for an electric vehicle according to the present embodiment, FIG. 2 is a schematic configuration diagram of the heating device for an electric vehicle according to the present embodiment, and FIG. 3 is according to the present embodiment. It is a circuit diagram of the heating apparatus for electric vehicles.

As shown in FIG. 1, a vehicle air conditioner 2 that can be mounted on an electric vehicle (hereinafter referred to as “electric bus”) 1 includes an electric vehicle cooling device (hereinafter referred to as “cooling device”) 3, and And an electric vehicle heating device (hereinafter referred to as a “heating device”) 4.
The cooling device 3 includes a compressor (compressor) 11, an indoor unit 12, and an outdoor unit 13.
In FIG. 1, reference numeral 1 a is a windshield, reference numeral 14 is a control panel arranged on the right side of the driver's seat, reference numeral 21 is arranged below the center floor of the electric bus 1, and heat medium heating constituting the heating device 4 Reference numerals 15 and 16 denote a cooling inverter (cooler) and a relay box (controller) arranged in a space formed on the back surface of the rear seat.

  The compressor 11 compresses a low-temperature / low-pressure gaseous refrigerant to form a high-temperature / high-pressure gaseous refrigerant, and is driven by an electric motor (not shown).

  The indoor unit 12 includes an evaporator (indoor heat exchanger: first heat exchanger) 17 installed on the roof R located on the front left side of the electric bus 1, an evaporator fan (indoor fan) (not shown), An expansion valve (not shown), an evaporator (indoor heat exchanger: first heat exchanger) 18 installed on the roof R located on the right front side of the electric bus 1, an evaporator fan (indoor fan) (not shown), And an expansion valve (not shown).

The evaporators 17 and 18 are flat box-shaped (rectangular) structures having a function of evaporating and evaporating the low-temperature and low-pressure liquid refrigerant that has passed through the expansion valve during cooling operation to take heat away from the air (inside air) in the vehicle. It is.
The evaporator fan is for increasing the amount of air sucked into the evaporators 17 and 18, and the evaporation of the gaseous refrigerant in the evaporators 17 and 18 is further promoted by the operation of the evaporator fan.
The expansion valve is a valve that decompresses and expands the refrigerant that passes through the expansion valve to form a low-temperature and low-pressure refrigerant.

The outdoor unit 13 is housed in a mounting space (accommodating space) (not shown) provided in the rear overhang of the electric bus 1, and includes a condenser (outdoor heat exchanger: second heat exchanger) (not shown), And a condenser fan (not shown).
The condenser is a flat box-like (rectangular) structure having a function of condensing and liquefying high-temperature and high-pressure gaseous refrigerant discharged from the compressor 11 during the cooling operation and radiating heat to the air outside the vehicle (outside air).
The condenser fan is for increasing the amount of air sucked into the condenser, and the operation of the condenser fan further promotes the liquefaction of the gaseous refrigerant in the condenser.

  The compressor 11 and the condenser are connected via a (first) refrigerant pipe (not shown), and the condenser and the evaporators 17 and 18 are provided with a receiver (not shown), a dryer (not shown), and the above-described expansion valve. The evaporators 17 and 18 and the compressor 11 are connected via a (second) refrigerant pipe (not shown) connected in order from the condenser side, and the (third) refrigerant pipe (not shown). Connected through.

  On the other hand, as shown in FIG. 2, the heating device 4 includes a heat medium heating device 21 including a plurality (four in this embodiment) of PTC heaters (electric heaters) 21 a, 21 b, 21 c, 21 d, and a preheater 22. A front heater 23, a (first) rear heater (middle heater) 24, a second rear heater (rear heater) 25, a water valve 26, a water pump 27, the heat medium heating device 21, and the preheater 22. A front heater 23, a rear heater 24, a rear heater 25, a water valve 26, and a water pump 27 are connected in order to form a (warm) water circulation path (flow path) and a (warm) water pipe 28.

  In addition, outlet temperature sensors 29a, 29b, 29c, and 29d that measure the temperature of (warm) water flowing out from the PTC heaters 21a, 21b, 21c, and 21d, respectively, at the outlets of the PTC heaters 21a, 21b, 21c, and 21d. And inlet temperature sensors 30a and 30b that measure the temperature of the (hot) water flowing into the PTC heaters 21a, 21b, 21c, and 21d, respectively, at the inlets of the PTC heaters 21a, 21b, 21c, and 21d. , 30c, 30d.

In addition, the PTC heater 21a, the outlet temperature sensor 29a, and the inlet temperature sensor 30a are manufactured as a single body, and the PTC heater 21b, the outlet temperature sensor 29b, and the inlet temperature sensor 30b are manufactured as a single body, The PTC heater 21c, the outlet temperature sensor 29c, and the inlet temperature sensor 30c are manufactured as a single body, and the PTC heater 21d, the outlet temperature sensor 29d, and the inlet temperature sensor 30d are manufactured as a single body.
Moreover, the solid line arrow in FIG. 2 has shown the direction through which (warm) water flows.

As shown in FIG. 3, the terminals of the number 8 of the PTC heaters 21a, 21b, 21c, and 21d and the terminal of the heater controller 31 (lower terminal in FIG. 3, the third terminal from the right) are the outlet temperatures. The measurement values measured by the sensors 29a, 29b, 29c, and 29d are connected (connected) via the electric wires 32a, 32b, 32c, and 32d that transmit the measured values to the heater controller 31, respectively.
In addition, the “7” terminal of the PTC heater 21a and the terminal of the heater controller 31 (lower terminal in FIG. 3, second terminal from the right) give the measured value measured by the inlet temperature sensor 30a to the heater controller 31. It is connected (connected) via the electric wire 33 to transmit. In other words, the “7” terminal of the PTC heaters 21b, 21c, and 21d and the terminal of the heater controller 31 (lower terminal in FIG. 3, second terminal from the right) are not connected.

The PTC heaters 21a, 21b, 21c, and 21d are respectively connected to the "1" terminals by electric wires 34 that supply power to the PTC heaters 21a, 21b, 21c, and 21d, and the PTC heaters 21a, 21b, and 21c. , 21d supply power to the outlet temperature sensor 29a and the inlet temperature sensor 30 of the PTC heater 21a, and supply power to the outlet temperature sensors 29b, 29c, and 29d of the PTC heaters 21b, 21c, and 21d. The electric wire 35 to be supplied is connected.
The PTC heaters 21a, 21b, 21c, and 21d have terminals “2”, “3”, “4”, and “5”, respectively. Electric wires 36, 37, 38, and 39 that switch (control) the number of capacity stages 21c and 21d (four stages in this embodiment) are connected.

According to the heat medium heating device 21 according to the present embodiment, the electric wire 33 that transmits the measured value to only one inlet temperature sensor 30a among the plurality of inlet temperature sensors 30a, 30b, 30c, and 30d is connected. Thus, the other inlet temperature sensors 30b, 30c, and 30d are not connected to the electric wires that transmit the measured values.
Thereby, simplification of an electric wire and a terminal can be achieved, and size reduction and weight reduction can be achieved.

  According to the heating device 4 including the heat medium heating device 21 according to the present embodiment, the heat medium heating device 21 in which simplification, miniaturization, and weight reduction of the electric wires and terminals are achieved. Therefore, the heating device 4 can be reduced in size and weight.

  According to the electric bus 1 provided with the heating device 4 according to the present embodiment, the heating device 4 is reduced in size and weight, so that the electric bus 1 is reduced in size and weight. Can be achieved.

  Note that the present invention is not limited to the above-described embodiment, and can be modified and changed as necessary.

1 Electric bus (electric car)
4 Heating device (electric vehicle heating device)
21 Heat medium heating device 21a PTC heater (electric heater)
21b PTC heater (electric heater)
21c PTC heater (electric heater)
21d PTC heater (electric heater)
29a Outlet temperature sensor 29b Outlet temperature sensor 29c Outlet temperature sensor 29d Outlet temperature sensor 30a Inlet temperature sensor 30b Inlet temperature sensor 30c Inlet temperature sensor 30d Inlet temperature sensor 32a Wire 32b Wire 32c Wire 32d Wire 33 Wire

Claims (3)

A heating medium heating device including a plurality of electric heaters including an outlet temperature sensor that measures the temperature of flowing water and an inlet temperature sensor that measures the temperature of flowing water,
All of the outlet temperature sensors are connected to an outlet wire that transmits a measured value, and only one of the inlet temperature sensors is connected to an inlet wire that transmits a measured value ,
The other end of the outlet electric wire and the other end of the inlet electric wire are connected to a heater controller, respectively .   A heating device for an electric vehicle, comprising the heat medium heating device according to claim 1.   An electric vehicle comprising the electric vehicle heating device according to claim 2.

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