JPS59130722A - Car air conditioner - Google Patents

Abstract

PURPOSE:To improve cooling capacity of evaporator by providing a drain pipe to be inserted with high pressure refrigerant piping and cooling the refrigerant with drain flowing through a discharge pipe thereby increasing over-cooling degree of refrigerant. CONSTITUTION:Drain produced through cooling operation of evaporator 10 will flow along the bottom face of cooler case 12 then enter through a drain port 15 into a water pipe 16 and discharged through an opening 18. Since the gap between the drain path 14 or branch 8 and the water pipe 16 is small, approximately saturated cooling liquid from a receiver tank 7 is overcooled by the drain 14 having temperature of 0-10 deg.C to considerable degree when reaching to an expansion valve 9. In such a manner, cooling capacity of evaporator is increased resulting in reduction of size of evaporator or compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automotive air conditioner that can increase cooling capacity.

A conventional automobile air conditioner will be explained using FIG. In FIG. 1, 1 is an automobile engine (hereinafter referred to as the engine), 2 is a refrigerator compressor (hereinafter referred to as the compressor)', and 3 is a compressor for a refrigerator driven by this engine 1 (hereinafter referred to as the compressor).
is the crank pulley, 4 is the console clutch pulley,
5 is a belt. And driving the Ennon 1 above KJ:! ll, the compressor 2 is driven.

The refrigerant gas compressed by the compressor 2 is condensed and liquefied in the condenser 6, passes through the receiver tank 7 and the liquid pipe 8, and reaches the expansion valve 9. Here, after being decompressed and expanded, it is evaporated in the evaporator 10, and the suction pipe 11fK: Passes through and is sucked into compressor 2.

Next, using FIG. 2, the evaporator 10 shown in FIG.
The detailed configuration will be explained below. In FIG. 2, 12 is a cooler case. The evaporator 10 is housed in a cooler case 12, and the moisture in the air condensed on the fin surface of the evaporator 10 falls into a drain 14.
The water flows down the bottom of the cooler case 12 and flows down from the drain hose 13. Here, the condenser 6 is placed behind a radiator grill (not shown) at the forefront of the vehicle body, and the liquid pipe 8 passes through the engine room and reaches an expansion valve 9 and an evaporator 10 inside the vehicle interior. Since the temperature inside the engine room is high, the temperature drop of the refrigerant liquid in the liquid pipe is small.

Next, the drawbacks of the conventional automobile air conditioner will be explained with reference to the Mollier diagram shown in FIG. In the figure, expansion valve 9
The degree of supercooling (difference between the saturation temperature of the refrigerant pressure and the actual refrigerant temperature) Δ'rsc before the refrigerant is usually as small as 0 to 2 degrees. Therefore, the refrigeration effect Δ1 (kc
aJ/kg) is smaller than when the degree of supercooling is large, such as Δ'r4c, and therefore has the disadvantage that the cooling capacity is small.

This invention has been made in view of the above points, and is capable of increasing the cooling effect Δi by increasing the degree of supercooling ΔT8°, increasing the cooling capacity, and reducing the size of the evaporator. The purpose is to provide equipment.

Hereinafter, one embodiment of the present invention will be fully described with reference to the drawings.

FIG. 4(A) is a sectional view of the automobile air conditioner according to the present invention, and FIG. 4(B) is a top view of the same.
In A) and (B), the same numbers as in Figure 2 will be given to the same names.

In Fig. 4, 7 is a cash register/%” tank, 8 is a liquid pipe,
9 is an expansion valve, 10 is Enozu 7"? 12 is a cooler case, 15 is a drain outlet of the cooler case, 16 is a liquid pipe cooling water/move (hereinafter referred to as a water pipe) 1, the liquid pipe 8 is a drain drain of the cooler case 12 Mouth I
5, enters the cooler case 12, and is connected to the expansion valve 9. The liquid pipe 8 and the water pipe 16 have a double pipe structure, and there is a slight gap between the outer diameter of the liquid pipe 8 and the inner diameter of the water pipe 16, through which the drain 14 passes. It flows. One end 17 of the water pipe 16 is connected to the drain outlet 15 of the cooler case 120, and the other end 18 is connected to the liquid pipe 8.
It is opened to the outside near the connection port between the cash register and the cash register 7.

Next, the operation will be explained. In FIG. 4, the drain 14 generated by the cooling action of the evaporator 10 flows along the bottom surface of the cooler case 12 and enters the water pipe 16 through the drain outlet 15. Since the gap between the drain 140 passage, that is, the liquid pipe 8 and the water pipe 16, is small, the drain 14 flows in sufficient contact with the outer surface of the liquid pipe 8, and the refrigerant liquid in the liquid pipe 8 is cooled. be done. And water zoeb 16
The drain 14 that has flowed through the drain 14 flows down from the opening 18 to the outside. Here, the temperature of the refrigerant liquid is usually 50 to 80°C, and at the outlet of the resino tank 7 it is in a nearly saturated liquid state (point a on the Mollier diagram in Figure 3), but the liquid pipe 8 While proceeding, it is supercooled in the drain 14 whose temperature is 0 to 10°C, and when it reaches the expansion valve 9, a large degree of supercooling is achieved. (In the Mollier diagram of FIG. 3, the point is 0, compared to the conventional point b.

Therefore, the refrigerant effect in the evaporator is smaller than the conventional Δi
Δi′ increases with respect to Δi′.

The automotive air conditioner according to the present invention may include a car air conditioner, a truck air conditioner, a air conditioner, etc.

As described in detail above, according to the invention in item I, the degree of supercooling of the refrigerant liquid can be increased, so that the cooling capacity of the evaporator can be increased. Therefore, for the same cooling capacity, the engine/guporator can be made smaller, which is effective in saving space in the vehicle interior. Similarly, the compressor can be made smaller for the same cooling capacity, which saves power and is advantageous in terms of fuel efficiency of the vehicle.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a conventional automotive air conditioning system, Figure 2 is a diagram showing the main parts of a conventional automotive air conditioning system, Figure 3 is a diagram showing a Mollier diagram, and Figure 4 (A> is this diagram). A sectional view of an automobile air conditioner according to an embodiment of the invention, and FIG. 4(B) is a top view thereof. 2. Compressor for refrigerator, 8. Liquid pipe, 10.
...Evaporator, 12...Cooler case, 14...
Drain, 16... Water pipe for liquid pipe cooling.

Claims (1)

[Claims] It is equipped with a cooler case housing an evaporator, a drain discharge pipe connected to a drain outlet of the cooler case, and a high-pressure refrigerant liquid pipe passing through the drain discharge pipe, and flowing into and through the high-pressure refrigerant pipe. An air conditioner for an automobile, characterized in that the refrigerant liquid is cooled by a drain flowing outside the high-pressure refrigerant pipe.