JPS59176555A - Preventive device for over-enclosing of refrigerant of cooler cycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigerant overfill prevention device for a cooler cycle that prevents overfilling of refrigerant when filling the cooler cycle in an air conditioner. .

As a conventional cooler cycle, there is a cooler cycle used in an air conditioner of an automobile as shown in FIGS. 1 to 3, for example. 1 in the figure is a cooler cycle, which includes a compressor 3 driven by an engine 2, a condenser 4, a liquid tank 5, an expansion pulp 6, and an evaporator 7.
In the cooler cycle 1, the refrigerant compressed by the compressor 3 is cooled and liquefied by the condenser 4, and sent to the liquid tank 5, where the refrigerant is temporarily filtered and stored. From there, the air is sent to an evaporator 7 via an expansion valve 6, where heat is removed from the surrounding air to vaporize it, and then the air is circulated to the compressor 3. Further, a charge valve 9 for charging refrigerant is provided in the middle of the pipe 8 leading from the evaporator 7 to the compressor 3.

This charge valve 9 is connected to the injection path 1 in the pulp case 10.
The valve body 12 is assembled into the refrigerant filling nozzle 1, and the injection port 13 is sealed with a cap 14. When filling the refrigerant, the cap 14 is removed, and all injection ports 13 (not shown) for refrigerant filling are removed.
By inserting it into the pulp body 12 and suppressing and releasing it,
A refrigerant is sealed in the pipe 8 through the injection path 11, and this refrigerant is mainly stored in the liquid tank 5. And in Liquid Tongue 5, entrance 15 p.
The refrigerant 17 introduced and stored in the tank main tree 16 is passed through the outlet pipe 18
The bubbles of the refrigerant 17 are guided through the sight glass 19 to the outlet 20 through the corresponding position of the sight glass 19.
Refrigerant 1 inside cooler cycle 1 can be seen by looking through the whole
I am trying to make a complete judgment as to whether or not the amount of enclosure No. 7 is appropriate.

However, in such a conventional cooler cycle 1, whether or not the amount of refrigerant 17 sealed in the cooler cycle 1 is appropriate depends on the amount of refrigerant 1 passing through the side glass 19.
Since the situation in No. 7 had no choice but to be determined by visually confirming the entire bubble generation situation, visual confirmation of the appropriate amount of refrigerant 17 had to rely on experience, was lacking in certainty, and The generation state of bubbles 17 is not limited to the amount of refrigerant 17 filled, but also changes depending on the operating condition of the compressor 3 due to the outside temperature and the rotation speed of the engine 2. Therefore, it is difficult to determine the amount of refrigerant 17 filled only by the bubble generation condition. As a result, even if the appropriate amount of refrigerant 17 is charged, if the cooling efficiency decreases due to some influence and the generation of bubbles approaches an insufficient amount, the refrigerant 17 tends to be overfilled, and the cooling efficiency decreases. There are problems in that the compressor 3 may be completely degraded or an excessive load may be placed on the compressor 3, resulting in damage to the compressor 3.

This invention was made by focusing on such conventional problems, and it is possible to automatically detect the appropriate amount of refrigerant and prevent the refrigerant from being filled in more than the appropriate amount. The purpose is to provide a prevention device.

Specifically, the IC for preventing overfilling of refrigerant in a cooler cycle of the present invention detects the liquid level position and sends a signal when the amount of refrigerant filled in the liquid tank in the cooler cycle exceeds an appropriate amount. The above-mentioned conventional problems are solved by providing a sensor and a configuration in which the charge pulp for refrigerant filling is provided with an electric valve that operates in response to a signal from the level sensor and closes the charge pulp injection path. It is something.

The present invention will be explained below based on the drawings.

In addition, in the following, parts common to those of the prior art are given the same reference numerals, and redundant explanations will be omitted.

FIGS. 4 to 6 are diagrams showing one embodiment of the present invention. First, a level sensor 30 is provided in the liquid tank 5 in the cooler cycle 1. This level sensor 30 has a float 34 with a magnet 33 loosely fitted into a cylinder 32 containing a reed switch 31, and this float 34 moves up and down according to the liquid level 35 in the tank body 16. When this liquid level 35 exceeds the appropriate amount position x'l of the refrigerant filling amount, the magnet 33 of the float 34
'Th OIJ and sends a signal.

Further, the reed switch 31 is connected to a battery 38 via a relay 36 and an air conditioner switch 37', and when the reed switch 31 is on, the excitation coil 39 of the relay 36 is energized to turn on the relay 36. It has become. A solenoid pulp 40 as an electric valve connected to the relay 36 and operated in response to a signal from the level sensor 30 is provided in the charge pulp 9 for charging refrigerant.

Specifically, this solenoid valve 40 is disposed substantially perpendicular to the pulp case 10 of the charge pulp 9, and the valve body 41 is normally fully opened by the biasing force of a spring 42 to the injection path 11 of the charge pulp 9. However, when the electromagnetic coil 43 becomes excited, it projects into the injection path 11 and closes the injection path 11.

Next, the action will be explained.

First, if the amount of refrigerant enclosed in the cooler cycle 1 is insufficient and the refrigerant is to be filled, the air conditioner switch 37eoniCI,
However, the liquid level 35 of the refrigerant 17 in the liquid tank 5 has not reached the appropriate amount position X, and the reed switch 31 n of the level sensor 30 is turned OFF.

Since the relay 36 is also OFF, the solenoid valve 40 fully opens the injection path 11 for the charge pulp 9, making it possible to fully fill the refrigerant. Next, refrigerant is charged from the charge pulp 9, and when the amount of refrigerant sealed increases, the liquid level 35 of the refrigerant 17 in the liquid tank 5 rises, and when the liquid level 35 reaches the appropriate amount position X, the lead of the level sensor 30 The switch 31 is turned on, the relay 36 is also turned on, and the battery 38 is turned on.
The current flows through the electromagnetic coil 43 of the solenoid pulp 40, and the valve body 41 of the solenoid pulp 40 operates to close the injection path 11 of the charge pulp 9 and prevent further injection of refrigerant. As a result, overfilling of refrigerant can be reliably prevented.

As explained above, according to the present invention, the configuration includes a level sensor that detects the liquid level position and sends a signal when the amount of refrigerant filled exceeds the appropriate amount in the liquid tank during the cooler cycle. At the same time, we installed an electric valve in the charge pulp for refrigerant filling, which operates in response to the signal from the level sensor and closes the charge pulp injection path, so that the level sensor can reliably detect the correct amount of refrigerant. Since the electric valve is fully activated and the charge pulp injection path is closed to prevent refrigerant injection, it is possible to reliably prevent refrigerant from being overfilled. In addition to being able to seal the refrigerant, it also has the effect of preventing a decline in cooling performance and excessive burden on the compressor due to overfilling of refrigerant, thereby improving the durability of the compressor.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram showing a conventional cooler cycle, Fig. 2 is an enlarged sectional view showing the liquid tank in Fig. 1, Fig. 3 is an enlarged sectional view showing the charge pulp in Fig. 1, and Fig. 4 is an enlarged sectional view showing the liquid tank in Fig. 1. A schematic explanatory diagram showing a cooler cycle fully equipped with the refrigerant overfill prevention device of this invention, FIG. 5 is an enlarged sectional view showing the entire liquid tank of FIG. 4, and FIG. 6 is an enlarged view showing the charge pulp of FIG. 4. FIG. 1...Cooler cycle 5...Liquid tank 9...Charge pulp 11...Injection path 17...Refrigerant 30...Level sensor 35...Liquid level 40...Solenoid pulp X...・Proper amount position 11

Claims (1)

[Claims] The liquid tank during the cooler cycle is equipped with a level sensor that detects the liquid level position and sends a signal when the appropriate amount of refrigerant is filled, and the signal from the level sensor is sent to the charge valve for refrigerant filling. A device for preventing overfilling of refrigerant in a cooler cycle, which is equipped with an electric valve that closes the injection path of a charge valve when activated by the electric current.