JPS6340758Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an air conditioning and refrigeration system for automobiles, which includes an air conditioning system (cooling system) and a refrigeration system (refrigerator).

In recent years, not only air conditioning (cooling equipment) but also refrigeration equipment has been installed, but since the equipment has the drawback of becoming larger and more expensive, it is not recommended to install the air conditioning equipment and refrigeration equipment separately. Instead of things,
BACKGROUND ART Devices have been used that utilize an air conditioner to provide a refrigerator with a refrigerating evaporator downstream of an air conditioning evaporator.

However, the refrigeration evaporator located downstream of the air conditioning evaporator is supplied with high temperature refrigerant flowing out from the air conditioning evaporator.
Not only is it unable to perform a sufficient function as a refrigeration unit, but the temperature of the refrigeration evaporator rises rapidly every time the air conditioning compressor stops due to temperature control or defrosting of the air conditioning evaporator, and the average temperature further increases. It was expensive and had drawbacks in practical terms.

Furthermore, even when only refrigeration is required, the air conditioning compressor has to be operated, which has many disadvantages in practical terms, such as being extremely uneconomical in terms of both power and fuel consumption.

Therefore, the object of this invention is to provide an air conditioning/refrigeration system for automobiles that can function satisfactorily as a refrigeration system (refrigerator).

However, the gist is that air conditioning compressors,
A cooling cycle is constituted by an air conditioning condenser and an air conditioning evaporator, and a refrigeration evaporator is arranged in parallel with the air conditioning evaporator, and the outlet side piping of the refrigeration evaporator is a confluence point with the outlet side piping of the cooling evaporator. A refrigeration compressor driven by an electric motor is provided in series with the air conditioning compressor, and a self-holding relay is installed between the air conditioning compressor and the refrigeration unit, which is operated by the switching output of the air conditioning thermostat that turns on and off the air conditioning compressor. This is installed in the refrigeration compressor drive circuit of the refrigeration compressor so that the refrigeration compressor starts after the air conditioning thermostat is activated for the first time.

Therefore, by driving the refrigeration compressor, the air conditioning compressor can be operated when necessary, regardless of whether the air conditioning compressor is being driven.
This makes it possible to send enough low-temperature refrigerant to the refrigerator evaporator to sufficiently cool the refrigerator, and when the temperature inside the vehicle is high, the refrigerant is first supplied only to the air conditioning evaporator. After the interior of the vehicle is cooled down, the refrigerating compressor is activated, giving priority to the air conditioner, and achieving the above-mentioned objective.

Examples of this invention will be described below with reference to the drawings.

In the figure, an air conditioning compressor 1, an air conditioning condenser 6, an air conditioning evaporator 8, etc. are connected via piping to form a cooling cycle, and the air conditioning compressor 1 receives driving force from a vehicle engine (not shown). It is reported that the electromagnetic clutch 2
Its drive is controlled by turning ON and OFF. The drive control of the air conditioning compressor 1 is performed by closing the air conditioning switch 3, and the following air conditioning evaporator 8 is activated.
This is done by a thermo switch 4 that senses the surface temperature of the. 5 is a temperature sensing part of the thermo switch 4.

The air conditioning condenser 6 is provided at the front of the vehicle, and receives pressurized refrigerant from the air conditioning compressor 1 and the refrigeration compressor 19 described below, and cools the pressurized refrigerant to condense and liquefy it. be.

The liquid receiver tank 7 temporarily stores the liquid refrigerant sent from the condenser 6. The air conditioning evaporator 8 is located inside the air conditioning case (not shown) and has the function of cooling the air sent by a blower (not shown), and the thermal load on the air conditioning evaporator 8 changes the opening degree of the expansion valve 9. Ability is controlled by controlling. The temperature-sensitive cylinder 10 of the expansion valve 9 is provided in the outlet-side pipe 11b of the air-conditioning evaporator 8 downstream from the confluence B with the outlet-side pipe 15b of the refrigeration evaporator 13, which will be described below. detects the combined heating degree of the air conditioning evaporator 8 and the refrigeration evaporator 13. Therefore, the expansion valve 9 is opened wide depending on the degree of heating of the refrigerating evaporator 13, thereby improving the cooling capacity. In addition, when the expansion valve 9 is an external pressure equalization type, it is possible to improve the capacity of the air conditioning evaporator 8 by connecting the external pressure equalization pipe so as to introduce pressure from downstream of the confluence point B. It is. Reference numeral 12 denotes a one-way valve for preventing backflow, which is provided between the branch point A and the expansion valve 9 on the downstream side.

The refrigeration evaporator 13 is for cooling the refrigerator installed in the vehicle, and is provided in parallel with the air conditioning evaporator 8. It is connected to the inlet pipe 11a of the air conditioning evaporator 8 between the liquid receiver tank 7 and the air conditioning evaporator 8, and the refrigerant flows from the branch point A through the one-way valve 16 and the reservoir 17 to the fixed expansion valve. Capillary tube 18
It flows into the refrigeration evaporator 13 via the outlet pipe 15b, and then merges into the outlet pipe 11b of the air conditioning evaporator 8 at the confluence point B via the outlet pipe 15b.

The refrigeration compressor 19 is provided on the outlet side piping 15b of the refrigeration evaporator 13, and functions to guide the refrigerant into the refrigeration evaporator 13.The refrigeration compressor 19 is rotated by an electric motor. It is configured to work by closing the refrigeration switch 20, but in this embodiment, in order to give priority to the air conditioner, the heat load inside the vehicle is reduced and the drive of the air conditioning compressor 1 is cut off for the first time. The structure is such that no current flows through the refrigerating compressor drive circuit until the thermo switch 4 is closed. Its configuration consists of a thermoswitch 4 for controlling the air conditioning compressor 1.
A self-holding circuit consisting of a self-holding relay 21 connected to the fixed contact 4b on the OFF side is provided, and a contact 21a opened and closed by the relay 21 is provided in the refrigerating compressor drive circuit.

A thermoswitch 22 controls the refrigerating compressor 19, and a pressure switch 23 detects the refrigerant pressure and turns off the refrigerating compressor 19, both of which are provided in the refrigerating compressor drive circuit.

In the above-mentioned configuration, the time of air conditioning operation, the time of air conditioning/refrigeration operation, and the time of refrigeration operation will be explained separately.

To perform air conditioning operation, when the air conditioning switch 3 is closed, the electromagnetic clutch 2 is connected to the air conditioning compressor 1.
When turned ON, driving force is transmitted and rotated, and refrigerant compression begins. The refrigerant is condensed and liquefied in the condenser 6, flows mostly from the branch point A into the air conditioning evaporator 8, evaporates inside the evaporator 8, cools the air passing through the evaporator 8, and exits the outlet pipe 11b.
The air is sucked into the air conditioning compressor 1, and compressed again by the air conditioning compressor 1, repeating the above-mentioned action. In addition, even in this case, although most of the refrigerant flows to the air conditioning evaporator 8, a small amount flows to the refrigeration evaporator 13, so there is a cooling effect, although the capacity is small.

To perform both air conditioning operation and refrigeration operation, the air conditioning switch 3 is closed, and the refrigeration switch 20 is also closed.

As a result, the air conditioning compressor 1 is rotated to start cooling operation, but the refrigeration compressor 19 is not operated until the interior of the vehicle is cooled down.
is not rotated. When the vehicle interior is cooled down, the heat load on the air conditioning evaporator 8 is reduced, so the movable contact of the thermoswitch 4 is
Switches to the OFF side fixed contact 4b side, relay 2
1 is excited and its contact 21a is closed, so the refrigerating compressor drive circuit is closed and the refrigerating compressor 19 is rotated.

Therefore, a part of the refrigerant flows from the diversion point A to the one-way valve 1.
6. The superheated refrigerant is led to the refrigeration evaporator 13 via the reservoir 17 and the capillary tube 18, and evaporates therein to cool the inside of the refrigerator. The air flows into the outlet pipe 11b of the air conditioning evaporator 8.

The air conditioning compressor 1 and the refrigeration compressor 19 are independently controlled and temperature-controlled by respective thermoswitches 4 and 22.

When the heat load on the air conditioning evaporator 8 decreases, the thermoswitch 4 turns off, the air conditioning compressor 1 stops driving, and only the refrigeration compressor 19 is driven, the refrigerant is transferred from the refrigeration compressor 19 to the air conditioning Pass through compressor 1 for
A circuit returns to the refrigeration compressor 19 via the air conditioning condenser 6, liquid receiver tank 7, branch point A, one-way valve 16, reservoir 17, and refrigeration evaporator 13. At that time, the air conditioning compressor 1 is not driven, but since the leads of the suction valve and discharge valve are a type of one-way valve, the refrigerant can flow, and this does not interfere with the refrigeration operation. Although the fan of the air conditioning condenser 6 is not rotated due to the inactivity of the cycle, the natural heat dissipation of the air conditioning condenser 6 is sufficient since the refrigeration load is small.

In order to perform the refrigeration operation independently, the electric circuit of this embodiment cannot operate, but the relay 2
If a circuit is provided to bypass the first contact 21a and the air conditioning switch 3 to supply power to the refrigerating compressor 19, independent operation is also possible. The example of operation in this case is the same as the state where air conditioning compressor 1 is not driven by thermo switch 4 described above.

As described above, according to this invention, the refrigerating evaporator pressurizes the refrigerant with a dedicated refrigerating compressor, so it can be operated regardless of whether the air conditioner is being driven or not, so it can provide sufficient cooling effect in the refrigerator. It has the advantage of being able to obtain

The refrigeration compressor of the refrigeration system has a small refrigeration load, so a small compressor can be used, and its use does not significantly increase power consumption, and it can be operated even when the vehicle engine is stopped. It is. If necessary, refrigeration can also be performed using an external power source. Furthermore, since the refrigeration compressor becomes operational only after the interior of the vehicle has cooled down, priority can be given to air conditioning.

Furthermore, while the air conditioner is in operation, a small amount of refrigerant also flows into the refrigerating evaporator, so it has the effect of cooling the inside of the refrigerator, although the temperature is not very low.

Furthermore, since the same refrigerant is used in the air conditioner and the refrigerator, it has the advantage that the amount of refrigerant can be checked and refilled only once.

[Brief explanation of the drawing]

The figure is a configuration diagram of an embodiment of this invention. 1... Air conditioning compressor, 6... Air conditioning condenser, 8... Air conditioning evaporator, 13... Refrigeration evaporator, 15b... Outlet side piping, 19
...Refrigerated compressor.

Claims (1)

[Scope of utility model registration request] The cooling cycle consists of an air conditioning compressor, an air conditioning condenser, and an air conditioning evaporator.
A refrigeration evaporator is arranged in parallel with the air conditioning evaporator, and is driven by an electric motor in series with the air conditioning compressor between the outlet side piping of the refrigeration evaporator and the confluence with the outlet side piping of the cooling evaporator. A refrigeration compressor is provided in the refrigeration compressor drive circuit of the refrigeration compressor, and a self-holding relay is provided in the refrigeration compressor drive circuit of the refrigeration compressor, which is operated by the switching output of the air conditioning thermostat that turns on and off the air conditioning compressor. An air conditioning/refrigeration system for an automobile, characterized in that the refrigerating compressor starts up after the thermostat is activated for the first time.