JPH0732870A - Refrigerating cycle - Google Patents

Abstract

PURPOSE:To provide a refrigerating cycle having a mechanism to keep the inside of a vehicle room cold uniformly when a vehicle engine is stopped. CONSTITUTION:In a refrigerating cycle having a compressor 6 which is actuated by/connected to an vehicle driving engine and sends a refrigerant forcibly, a capacitor 7 to radiate heat of the refrigerant, an expansion valve 8 to send the refrigerant into an evaporator 4 by expanding it, the evaporator 4 to evaporate the refrigerant and a cold accumulating material 3 cooled by the evaporator 4, the refrigerating cycle has a mechanism to keep cold by radiating accumulated heat of the cold accumulating material 3 refrigerant by a pump 10 driven by battery electric power supply when a vehicle is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold insulation mechanism capable of maintaining a refrigerating or cooling capacity for a cooled portion such as a vehicle compartment even when the engine is stopped.

[0002]

2. Description of the Related Art Conventionally, as a mechanism of this kind, Japanese Patent Laid-Open No.
-128991. In this publication, the cooled portion is cooled when the engine is driven, the regenerator material installed in the cooled portion is also cooled, and the heat of the regenerator material is released when the engine is stopped to prevent the temperature of the cooled portion from rising. Types are known.

[0003]

However, in the above-mentioned conventional structure, the cooling by the regenerator material depends on the emission of cold air from the surface of the regenerator material (hereinafter, this cold air is referred to as heat storage). Therefore, not only the coolness of the vicinity of the cold storage material is better kept, and the cold storage ability becomes worse as the distance from the cold storage material increases, but the cooling ability sharply decreases when the surface temperature of the cold storage material rises, and There was a problem that you couldn't fully use.

The present invention has been made in view of the problems existing in the above-mentioned prior art, and an object thereof is to provide a refrigerating cycle having a mechanism for uniformly and effectively keeping a cooled portion cold when the engine is stopped. To provide.

[0005]

In order to achieve the above object, the present invention is configured as follows. That is, it is operatively connected to a vehicle drive engine, and has a compressor that pressure-feeds the refrigerant, a condenser that radiates heat of the refrigerant, an expansion valve that expands the refrigerant and sends it to the evaporator, and an evaporator that evaporates the refrigerant, and In a refrigeration cycle having a regenerator material cooled by the evaporator, a mechanism is provided for releasing the heat storage of the regenerator material by a secondary refrigerant circulated by a pump.

In addition to the above structure, it is effective to include a control device that operates the pump according to the temperature of the cooled portion. Further, it is effective that the regenerator material is housed in the heat insulating case, and the pipeline of the secondary refrigerant penetrates inside and outside the heat insulating case.

[0007]

In the refrigeration cycle of the present invention constructed as described above, the heat storage of the regenerator material is uniformly released into the vehicle compartment through the secondary refrigerant when the vehicle is stopped. Further, in the case where the control device is provided, the pump is automatically driven and stopped according to the temperature of the cooled portion. Further, in the case where the cold storage material is housed in the heat insulating case, unnecessary storage of heat is not performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a refrigerating cycle of a refrigerating vehicle will be described with reference to FIGS.

First, as shown in FIG. 1, a cold storage material 3 and an evaporator 4 housed in a heat insulating case 2 are installed in a freezer 1 as a cooled portion, and the evaporator 4 is the cold storage material. 3 penetrates the inside and outside of the heat insulating case 2 so that a part thereof is buried inside. The evaporator 4 has radiating fins 5a and 5b on both the inside and outside of the regenerator material 3. The cold storage material 3 is made of salt water, ethylene glycol, or the like. Outside the freezer 1, a compressor 6, a condenser 7, and an expansion valve 8 that are operatively connected to a vehicle driving engine are installed. Refrigerant such as Freon gas is taken into the evaporator 4, and the freezer 1
After being evaporated and absorbed by the heat inside, the compressor 6 pumps it to the condenser 7 where it is radiated, and then the expansion valve 8
Is expanded and taken into the evaporator 4 again.

Further, in the freezer 1, a pipe line 9 penetrating the inside and outside of the cold storage material 3 is laid around a wide area in the freezer 1, and the secondary refrigerant in the pipe line 9 is used for the refrigeration vehicle. It is circulated by a pump 10 that is electrically driven by one battery power source. As the secondary refrigerant, one having the same solution as the regenerator material 3 and a high concentration and a low freezing point is used. Also,
The pipe line 9 has heat absorbing fins 11 inside the regenerator material 3 and heat radiating fins 12 in the entire area outside the regenerator material 3. The operation of driving and stopping the pump 10 is
It is performed by a switch (not shown) provided in the driver's seat.

Next, the operation of the refrigerating cycle thus constructed will be described. When the engine of the refrigeration vehicle is driven, the refrigerant is pressure-fed to the condenser 7 by the compressor 6 operatively connected to the engine, cooled by the outside air in the condenser 7, and fed to the evaporator 4 via the expansion valve 8. In the evaporator 4, the refrigerant is the freezer 1
The room temperature inside and the temperature of the regenerator material 3 are set to the radiation fins 5b, 5
The temperature of the inside of the freezer 1 and the temperature of the regenerator material 3 are lowered by taking away via a. Then, the refrigerant is sent to the compressor 6, and again sent to the condenser 7 by pressure by the compressor 6. By repeating such a cycle of the refrigerant, the inside of the freezer 1 is cooled and the cold storage material 3 stores cold heat. At this time, since the cold storage material 3 is covered by the heat insulating case 2, the cold storage of the cold storage material 3 is effectively performed. At this time, the pump 10 for circulating the secondary refrigerant is stopped.

Since the compressor 6 is stopped when the engine of the refrigerating car is stopped, the freezer 1 by the circulation of the refrigerant is used.
The cooling action inside is also stopped. At this time, when the pump 10 is driven by the operation of the switch provided in the driver's seat, the secondary refrigerant is circulated in the conduit 9 accordingly. This secondary refrigerant absorbs the cold heat of the cold storage material 3 when passing through the inside of the cold storage material 3, and releases the cold heat to the periphery of the pipeline 9 when passing through the inside of the freezer 1 outside the cold storage material 3. To do. The absorption and release of the cold heat are effectively performed by the heat absorption fins 11 and the heat radiation fins 12. Therefore, the inside of the freezer 1 is cooled or the temperature rise is prevented. At this time, the heat insulation case 2 covering the cold storage material 3 does not release the cold heat of the cold storage material 3 to the periphery of the cold storage material 3 by heat conduction. That is, the cold heat of the regenerator material 3 is released only by the secondary refrigerant that is circulated over a wide range in the freezer 1. Then, the pipeline 9 widely laid in the freezer 1
As a result, the inside of the freezer 1 is cooled uniformly at any place or the temperature rise is prevented.

According to this embodiment, the inside of the freezer 1 is kept cold even when the engine of the refrigerating vehicle is stopped due to the driver's lunch, delivery work, etc., so that all the places in the freezer 1 are frozen. There is no problem with the product.

Further, according to this embodiment, the freezer 1
Is kept by the secondary refrigerant releasing the heat stored in the cold storage material 3 into the freezer 1. However, since the pump 10 for circulating the secondary refrigerant does not perform the compression action, the pump 10 has a small capacity and a small size. The power consumption for driving the pump 10 is small and the cost is low.

Further, since the cold storage material 3 is housed in the heat insulating case 2, the heat storage of the cold storage material 3 is not dissipated except when the pump 10 is operating. When the pump 10 is operated, the heat storage of the regenerator material 3 is dissipated by the required amount only from the pipe 9. Therefore, unnecessary dissipation of heat storage can be prevented, and efficient and continuous cold storage can be achieved.

Next, a second embodiment of the present invention will be described with reference to FIG.
Follow the instructions below. In this embodiment, the switching of driving and stopping of the pump 10 is performed by the switch operation of the driver's seat in the above-described embodiment, but is controlled by the control device 13 as shown in FIG. A temperature sensor 14 is installed in the freezer 1, and the control device 13 controls the pump 10 based on the information from the temperature sensor 14.
Controls switching between driving and stopping. That is, when the engine is stopped and when the inside of the freezer 1 reaches a certain set temperature or higher, the control device 13 switches the pump 10 from the stopped state to the driven state, and cools the inside of the freezer 1 by the heat storage of the regenerator material 3. It is something that can be made. In this embodiment, the same effect as that of the above-described embodiment can be obtained, and further, the trouble of driving the pump 10 by the switch operation each time the engine is stopped can be omitted. Further, even when the engine is stopped, the pump 10 is not driven when the temperature inside the freezer 1 is below a certain set temperature, so that the heat storage of the regenerator material 3 can be efficiently used.

The present invention is not limited to the above-mentioned first and second embodiments, and can be carried out by arbitrarily changing the constitution without departing from the spirit of the invention. For example, the present invention may be applied to a cooling device for a passenger compartment of a passenger car as a cooled portion to keep the passenger compartment cool when the engine of the passenger car is stopped. In this case, the pipe line for the secondary refrigerant is arranged in the air ventilation passage adjacent to the pipe line for the refrigerant.

[0018]

As described above in detail, according to the refrigeration cycle of the present invention, there is an excellent effect that the vehicle compartment and the like can be cooled uniformly, effectively and continuously when the engine is stopped. Further, the cooling is performed by circulating the secondary refrigerant with a pump driven by a small amount of electric power, so that it is inexpensive.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a circulation path for a refrigerant and a secondary refrigerant according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a circulation path of a refrigerant and a secondary refrigerant of a second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Freezer as a to-be-cooled part, 2 ... Insulating case, 3 ... Insulating material, 4 ... Evaporator, 10 ... Pump, 13 ... Control device, 14 ... Temperature sensor

Claims (3)

[Claims] 1. A compressor that is operatively connected to a vehicle driving engine and that pumps a refrigerant, a condenser that radiates heat of the refrigerant, an expansion valve that expands the refrigerant and sends it to an evaporator, and an evaporator that evaporates the refrigerant. Further, in the refrigeration cycle having the regenerator material cooled by the evaporator, the refrigerating cycle is provided with a mechanism for releasing the heat storage of the regenerator material by the secondary refrigerant circulated by the pump. 2. The refrigerating cycle according to claim 1, further comprising a control device that operates the pump according to a temperature of a cooled portion. 3. The refrigeration cycle according to claim 1, wherein the regenerator material is housed in a heat insulating case, and a pipeline of the secondary refrigerant penetrates inside and outside the heat insulating case.