JPS6255588B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigeration cycle for an air conditioner.

The refrigeration cycle of a conventional air conditioner will be explained with reference to FIGS. 1 and 2. 1 is a rotary compressor, 2
3 is a condensing heat exchanger, 3 is an evaporation heat exchanger, 4 is a decompression capillary tube, and 5 is a suction tank. The high-temperature, high-pressure gaseous refrigerant compressed by the rotary compressor 1 radiates heat and condenses in a condensing heat exchanger (hereinafter referred to as a condenser) 2, is depressurized in a capillary tube 4, and is transferred to an evaporation heat exchanger. (hereinafter referred to as evaporator) 3 absorbs heat and evaporates to perform cooling operation. A suction tank 5 having the structure shown in FIG. 2 is provided in front of the refrigerant suction side of the compressor 1. The first purpose of the suction tank is to muffle the noise generated by the compressor, and the second purpose is to prevent liquid from returning to the compressor.
That is, during cooling operation, the suction tank temporarily stores surplus liquefied refrigerant 7 in the tank body 5'.
It is intended to return only the gaseous refrigerant to the compressor 1 and to return the refrigerating machine oil 8 accumulated in the refrigerant through the small hole 12 formed in the refrigerant discharge pipe 11. However, in conventional refrigeration cycles, the liquid refrigerant accumulated in the suction tank during operation and the liquid refrigerant accumulated in the evaporator, which flows in from the condenser 2 through the capillary tube when operation is stopped and increased in amount, are transferred during operation. At the time of starting (hereinafter referred to as "starting time"), the compressor 1 sucks and extrudes liquid through the small hole 12 at the same time, so an excessive load is placed on the compressor to compress the liquid, so the compressor must be rotated with a large torque. I couldn't start it.
Therefore, there were drawbacks such as the need for a high-output prime mover to rotate the compressor or a prime mover accessory device that outputs high output only during startup. Furthermore, increasing the starting torque also increases the input power to the prime mover, resulting in undesirable results in terms of energy conservation. SUMMARY OF THE INVENTION An object of the present invention is to provide a refrigerant cycle with low starting torque that eliminates the above-mentioned drawbacks. For this purpose, the present invention utilizes the refrigerant vapor flow in the suction tank and inertially separates it into a vapor flow and a liquid flow at high speed, thereby performing the functions of a suction tank and an accumulator simultaneously in one tank. It is something you can do.

The present invention will be explained in detail below with reference to Examples.
FIG. 3 shows an embodiment of the invention. As shown in FIG. 3, the suction tank is provided with a small hole 12' at the lower end of a pipe 19 which is attached to the buttful plate 13 so as to be offset from the flow direction of the refrigerant flowing out from the refrigerant inlet pipe 10. Tank body 5″
It is oriented in the circumferential direction. A baffle plate 13 and a thread 9 are disposed above the tank body 5'', and a refrigerant inlet pipe 10 connected to the refrigerant discharge port of the evaporator 3 is provided at the top of the tank.The refrigerant discharge pipe 11 is connected to the tank body 5''. It is connected to the refrigerant suction port of the compressor 1 from the lower part of the main body 5''. Immediately when the compressor 1 starts, the liquid refrigerant in the evaporator 3 is sucked and reaches the tank body 5'', but unlike the conventional method, it flows into the pipe 19 attached to the buttful plate 13 hanging downward from the tank body 5'', and flows into the tank. The refrigerant jet 16 turns upward at the bottom of the main body 5'' and becomes a high-speed refrigerant jet 16 (approximately 10 m/s) at the discharge port located above the tank main body 5'' and is ejected in the circumferential direction of the tank body 5''. Steam in the refrigerant jet 16 Since the flow 17 has a low specific gravity, it smoothly changes its flow direction and flows into the refrigerant discharge pipe 11, but the liquid flow 18, which has a high specific gravity, directly collides with the wall of the tank body 5'' due to centrifugal force, and after being urged by gravity. The vapor flow 17 then passes through the refrigerant discharge pipe 11 and reaches the compressor 1.
Note that fine droplets also float in the vapor flow 17, and these also reach the compressor 1 together with the vapor flow 17. This effect ensures that the refrigerating machine oil is recovered to the compressor. A small hole 12' is provided at the bottom of the pipe 19, and the liquid refrigerant 7 and refrigerating machine oil 8 remaining in the tank body 5'' always flow into the pipe 19 through the small hole 12' and are collected in the compressor as fine droplets. By doing this, it is possible to prevent a temporary excessive return of liquid and to always guarantee a constant return of oil.

FIG. 4 shows the results carried out according to the present invention.
A is a conventional example, and B is according to the present invention. According to the present invention, the peak of the liquid return amount immediately after the compressor is started is reduced, and a steady liquid return amount is ensured after time has elapsed.

5 and 6 show cross-sectional views of the tank structure shown in FIG. 3. In FIG. 5, the pipe 19 is placed along the inner wall of the tank, and in FIG. The figure shows the case when cut to .

FIG. 7 shows another embodiment of the present invention,
The tip of the pipe 19 is made perpendicular to the vertical plate 13. At this time as well, inertial separation is possible due to the difference in specific weight between gas and liquid. Also, Figures 8 and 9
The figure shows an example of the shape of the suction port of the refrigerant discharge pipe 11.
The tip of the pipe is bent diagonally to the side opposite to 9, and the separation effect is even more remarkable.

In order not to lose its effectiveness as a silencer, it was necessary to maintain the internal volume and aspect ratio of the tank body 5'' within the size range required by the rotary compressor, but this was not possible in the experiment. According to the results, it was confirmed that the starting torque was reduced by 22% while maintaining the same noise reduction effect as the conventional one.
In addition to the suction tank shown in FIG. 7, the same applies to suction tanks that utilize the inertial force of fluid, and the present invention is not limited to what is shown above.

As explained above, in the present invention, the suction tank 5 has the structure shown in FIG. 1 does not sud- denly draw in a large amount, so the rotational load on the compressor is small and cooling operation can now be performed using a low-output prime mover.

According to this embodiment, the structure of the suction tank 5 (FIG. 3) can be manufactured by slightly modifying the conventional structure (FIG. 2), and there is almost no difference in price.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of the refrigeration cycle of a conventional air conditioner, Figure 2 is a structural diagram of a conventional suction tank,
3 and 5 to 9 are structural diagrams of a suction tank according to an embodiment of the present invention, and FIG. 4 is a diagram showing the performance of an embodiment of the present invention. 1...Rotary compressor, 2...Condensing heat exchanger,
3... Evaporation heat exchanger, 4... Capillary tube, 5... Suction tank, 5', 5''... Tank body, 7... Liquid refrigerant, 8... Refrigerating machine oil, 9...
... Net, 10 ... Refrigerant inlet pipe, 11 ... Refrigerant discharge pipe, 12, 12' ... Refrigerating machine oil passage small hole, 13 ... Full plate, 16 ... Refrigerant jet, 1
7...vapor flow, 18...liquid flow, 19...pipe, → indicates the direction in which the refrigerant flows.

Claims (1)

[Claims] 1. In the refrigeration cycle of an air conditioner having a suction tank between the refrigerant discharge port of the evaporative heat exchanger and the refrigerant suction port of the compressor, the suction tank has a tank body, an upper end of the tank body, a refrigerant inlet pipe connected to the refrigerant discharge port;
A buttful plate is installed horizontally above the tank body, and is attached to the buttfull plate and hangs downwardly within the tank body, and is bent below the tank body to position its discharge port above the tank body. and a refrigerant discharge pipe connected to the lower part of the tank body and the refrigerant suction port, with the suction port located above the tank body, and the pipe has a mounting position on the butt-full plate. A refrigeration cycle for an air conditioner, characterized in that the refrigerant inlet pipe is deviated from the flow direction of the refrigerant flowing out from the refrigerant inlet pipe, and a small hole is formed in a lower bent portion.