JPH0611286A - Waste heat recovery heat accumulator - Google Patents

Abstract

PURPOSE:To efficiently accumulate heat by a method wherein a heating member provided inside an axle is at least partially embedded in or enclosed closely by the wall of a heat accumulator formed of the heat accumulating material remaining undissolved even at a temperature in excess of the fusing point. CONSTITUTION:The heat accumulator 12 is formed of the latent heat accumulating material remaining undissolved even at a temperature in excess of the fusing point. Spherical heat accumulating capsules 16 are immersed and sealed in a brine 14 and accumulate heat at a prescribed temperature. The heat accumulating energy density of such capsules 16 is greater than that of the heat accumulator 12. An inverter element 18 for use as a heating member is partially embedded in a wall part 12A of the heat accumulator 12. When the inverter element 18 is heated, therefore, the heat thus produced is directly transmitted to the wall part 12A of the heat accumulator 12 and accumulated in the heat accumulating capsules 16 via the brine 14 for use in heating a room space 28. This inverter element 18 is also used in controlling the operation of a motor of an electric car.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust heat utilization type heat accumulator for accumulating and effectively utilizing exhaust heat released from a heat generating member disposed inside a vehicle.

[0002]

2. Description of the Related Art In general, various heat generating members (for example, inverters and motors) are incorporated as functional parts inside vehicles, especially electric vehicles. For example, WO 91 /
Taking the electric vehicle disclosed in Japanese Patent No. 17902 as an example, motors are used as drive sources for front wheels and rear wheels, and these motors generate heat when driven. Therefore, in the structure disclosed in this publication, the refrigerant pipe in the cooling cycle for indoor air conditioning is connected to each motor in order to cool the motor that has generated heat, thereby cooling each motor that has generated heat.

However, in the case of this configuration, the heat generated by the motor is basically not used because the purpose is to maintain the performance of the motor by cooling the motor that generates heat. Further, in the case of this structure, since the refrigerant originally used for indoor air conditioning is used, the cooling efficiency in the room is significantly reduced.

However, recently, there are vehicles equipped with a heat accumulator that stores the exhaust heat of a heat generating member (engine or the like). In this type of vehicle, a heat generating member and a heat accumulator are connected by a refrigerant pipe, and heat is stored from a refrigerant flowing through the refrigerant pipe.

[0005]

However, in the case of such a heat storage structure, heat escapes from the surface of the refrigerant pipe before it absorbs the heat generated from the heat generating member and sends it to the heat storage device by the refrigerant pipe and the refrigerant. I will end up. Therefore, the heat storage structure described above has a problem that the heat storage efficiency is reduced.

In consideration of the above facts, an object of the present invention is to obtain an exhaust heat utilization type heat storage device capable of efficiently storing heat.

[0007]

According to the present invention of claim 1, there is provided a heat accumulator main body comprising a heat accumulating material which does not melt at least a part of a heat generating member disposed inside a vehicle even if the heat generating member exceeds a melting point. It is characterized in that it is embedded in the wall or surrounded by the wall of the main body of the heat storage unit in a substantially close manner.

According to a second aspect of the present invention, in the first aspect of the present invention, a heat storage body set to a predetermined heat storage temperature is enclosed in the heat storage body via a heat transfer medium. There is.

[0009]

According to the exhaust heat utilization type heat accumulator according to the present invention as set forth in claim 1, at least a part of the heat generating member disposed inside the vehicle is embedded in the wall of the heat accumulator main body or the heat accumulator main body. Is substantially tightly surrounded by the wall, the heat generated by the heat generating member is directly stored in the wall of the heat accumulator body. Since the heat accumulator body is made of a heat storage material that does not melt even if it exceeds the melting point, latent heat is stored.

From the above, heat can be efficiently stored without loss in the heat storage process, and the amount of heat storage is significantly increased because of latent heat storage.

According to the exhaust heat utilization type heat accumulator according to the present invention as set forth in claim 2, in the present invention as set forth in claim 1, the heat accumulating body set in the heat accumulator body at a predetermined heat storage temperature is used as the heat transfer medium. Since it is enclosed via the heat storage device, heat is transferred in the order of the heat accumulator body, the heat transfer medium, and the heat storage body to store heat. Here, the heat storage body is
Since the predetermined heat storage temperature is set, the heat generated by the heat generating member is stored at the predetermined heat storage temperature. Therefore, it is possible to dramatically increase the heat storage amount depending on how the heat storage temperature of the heat storage body is set.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment to which the present invention is applied will be described below with reference to FIG.

FIG. 1 is a schematic block diagram of an exhaust heat utilization system using a heat storage device 10 as an exhaust heat utilization type heat storage device according to the present invention. In this embodiment, this exhaust heat utilization system is applied to an electric vehicle (not shown).

The regenerator 10 comprises a hollow rectangular parallelepiped regenerator body 12, a brine 14 as a heat conducting medium enclosed therein, and a plurality of regenerators enclosed in the brine 14 in a dipped state. Heat storage capsule 16 as
It consists of

The heat storage body 12 is made of a latent heat storage material which does not melt even if its melting point is exceeded. The melting point of the heat accumulator body 12 is lower than the allowable temperature of the inverter element 18 described later, and the dropping point is higher than the allowable temperature of the inverter element 18.

Further, the heat storage capsule 16 enclosed in the brine 14 while being immersed therein has a spherical shape and is set to a predetermined heat storage temperature. Therefore, the heat storage capsule 16
Stores heat at a set temperature. In addition, heat storage capsule 1
The heat storage energy density of 6 (density of energy capable of storing heat per unit weight) is larger than that of the heat storage body 12.

Further, a part of the inverter element 18 (including the fin 18A) as a heat generating member is embedded in the one wall portion 12A of the heat accumulator body 12. Therefore, when the inverter element 18 generates heat, the heat at that time is directly transmitted to the one wall portion 12A of the heat accumulator body 12. The inverter element 18 is used for drive control of the electric vehicle motor.

A pipe line 20 is introduced into the heat storage body 12 described above.
Through one end and the other end, thereby forming one closed loop. A water pump 22 is arranged in the middle of the pipeline 20, and if necessary, the brine 1
4 is fed in the direction of arrow A in FIG. 1 and is circulated. In addition, an indoor heat exchanger 24 is arranged in the middle of the pipeline 20, downstream of the brine 14 in the feeding direction. A fan 26 is arranged at a position adjacent to the indoor heat exchanger 24,
Air-conditioned air is supplied to the indoor space 28 as needed.

Further, another heat storage device heat exchanger 30 is arranged in the heat storage device body 12. This internal heat exchanger 30 has an outdoor heat exchanger 32, a four-way valve 34, and a compressor 36.
Is connected via a refrigerant pipe 38 to form a heat pump cycle.

The operation of this embodiment will be described below separately for heating and cooling. When a motor of an electric vehicle (not shown) is driven and the inverter element 18 generates heat, the heat at this time is first directly transmitted to the heat storage body 12 and stored therein.
Next, heat is stored in the heat storage capsule 16 at a predetermined heat storage temperature via the brine 14.

In this state, the water pump 22 is driven and the warmed brine 14 is fed in the direction of arrow A in FIG. Therefore, the air near the indoor heat exchanger 24 is warmed and the warm air is sent to the indoor space 28 by the fan 26.

During this heating, the flow of refrigerant in the heat pump cycle is changed to the direction of arrow B in FIG. 1 by switching the four-way valve 34. As a result, the refrigerant flows into the compressor 3
6, the heat exchanger 30 in the regenerator flows in the order of the heat exchanger 30 and the outdoor heat exchanger 32, so that the heat exchanger 30 in the regenerator functions as a condenser and radiates heat. That is, the heat exchanger 30 in the heat accumulator in this case functions as a heat generating member similarly to the inverter element 18. Therefore, the amount of heat generated is increased as compared with the case where only the inverter element 18 is used, and the heat storage efficiency is improved.

On the other hand, during cooling, the flow of refrigerant in the heat pump cycle is changed to the direction of arrow C in FIG. 1 by switching the four-way valve 34. As a result, the refrigerant flows in the order of the compressor 36, the outdoor heat exchanger 32, and the internal heat storage heat exchanger 30, so that the internal heat storage heat exchanger 30 functions as an evaporator.
Has an endothermic effect. That is, the heat exchanger 30 in the heat storage device in this case functions as a cooling member, contrary to the inverter element 18. Therefore, the heat storage device 10 has a cold storage function. In this state, the water pump 22 is driven and the cooled brine 14 is fed in the direction of arrow A in FIG. Therefore, the air around the indoor heat exchanger 24 is cooled and the cool air is sent to the indoor space 28 by the fan 26. This allows
The vehicle interior is cooled.

During this cooling, since the heat storage device 10 stores the heat, the wall portion 12A of the heat storage device main body 12 is also cooled. Therefore, the inverter element 18 is also cooled sufficiently.

As described above, in this embodiment, since the inverter element 18 is embedded in the wall portion 12A of the regenerator body 12, the heat generated from the inverter element 18 is directly transferred to the wall portion 12A of the regenerator body 12, Since the heat is stored, there is no heat energy loss as compared with the case of indirectly storing the heat as described in the section of the prior art. Therefore, all the heat generated from the inverter element 18 can be efficiently used for heating. Further, the heat storage body 12
Since the inverter element 18 is embedded in the wall 12A of the device, the size of the device can be reduced.

Further, in this embodiment, a plurality of heat storage capsules 16 set at a predetermined heat storage temperature in the heat storage body 12 are provided.
The heat storage efficiency can be remarkably improved as compared with the case where this is not included.

Further, in this embodiment, since the heat pump cycle is also used in addition to the heat storage cycle, the amount of heat generation can be increased in combination with the inverter element 18 during heating, and the heat storage device 10 performs a cold storage operation during cooling. Inverter element 18 can be cooled sufficiently.

Further, when the inverter element 18 generates heat unsteadily, such as when traveling uphill, the regenerator body 12 functions as a heat interference material, so that the temperature of the inverter element 18 rapidly rises. Can be prevented.

Further, in the present embodiment, the inverter element 18
Since it is configured to heat using the exhaust heat of, the electric power is compared with a configuration in which the heat is stored in the heat storage device 10 by using a heater or the like, that is, a configuration in which a heat source for storing the heat is separately provided instead of using the exhaust heat. Can be reduced. This leads to an effect that it contributes to an increase in mileage when it is applied to an electric vehicle.

In this embodiment, the inverter element 18
However, the configuration is not limited to this, and a configuration that uses the exhaust heat of the motor may be used. When the exhaust heat of the motor is used, the shape of the heat accumulator body may be changed so that the wall of the heat accumulator body substantially surrounds the motor.

Further, in this embodiment, a system in which a heat pump cycle is used in addition to the heat storage cycle by the heat storage device 10 has been described as an example, but only the heat storage cycle may be used. In this case, a cooling system may be separately provided.

Further, although the present embodiment is applied to an electric vehicle, it can be applied to a normal vehicle.

[0033]

The exhaust heat utilization type heat accumulator according to the present invention as set forth in claim 1 is made of a heat storage material which does not melt at least a part of the heat generating member disposed inside the vehicle even if the melting point exceeds the melting point. Since it is embedded in the wall of the regenerator body or surrounded by the wall of the regenerator body in a substantially close manner, when the heat-generating member generates heat, the heat at this time can be directly stored in the wall of the regenerator body, efficiently. It has an excellent effect of being able to store heat.

According to a second aspect of the present invention, there is provided the exhaust heat utilization type heat accumulator according to the first aspect of the present invention, in which a heat storage body set to a predetermined heat storage temperature is provided in a heat storage body via a heat transfer medium. Since it has been enclosed by the above, it has an excellent effect that heat can be stored at a predetermined heat storage temperature, and the amount of heat storage can be dramatically increased depending on the set temperature.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an exhaust heat utilization system including a heat storage device according to an embodiment.

[Explanation of symbols]

 10 heat storage device (heat storage device using exhaust heat) 12 heat storage device body 14 brine (heat transfer medium) 16 heat storage capsule (heat storage body) 18 inverter element (heating member)

Claims (2)

[Claims] 1. At least a part of a heat-generating member disposed inside a vehicle is embedded in a wall of a heat storage body made of a heat storage material that does not melt even if its melting point is exceeded, or is substantially formed by a wall of the heat storage body. A waste heat utilization type heat accumulator characterized by being tightly enclosed. 2. An exhaust heat utilization type heat storage device according to claim 1, wherein a heat storage body set to a predetermined heat storage temperature is enclosed in the heat storage device body via a heat transfer medium.