JPH0648288Y2 - Appropriate refrigerant filling system for automotive air conditioners - Google Patents

Description

[Detailed description of the device]

[Industrial applications]

The present invention relates to a system for appropriately charging a refrigerant when charging a vehicle air conditioner with the refrigerant.

[Prior art]

Conventionally, in order to properly fill this type of refrigerant, a sight glass is provided on the high-pressure side of the cooling device or in the receiver dryer,
By visually checking the presence or absence of air bubbles in this sight glass,
It was determined whether the refrigerant was properly filled. On the other hand, for example, Japanese Examined Patent Publication No. 61-14430 and Japanese Utility Model Publication No. 63-10366.
In the publication, a thermistor which self-heats by passing a small current through a refrigerant passage from a condenser to a throttle device is provided, and the thermistor detects a gas-liquid mixture ratio of the refrigerant to detect a shortage of the refrigerant. It is disclosed.

[Problems to be solved by the device]

In the determination of the proper refrigerant filling amount using the sight glass, the worker makes a judgment by looking at the presence or absence of bubbles in the refrigerant passage through the sight glass, and therefore the worker varies the filling amount of the refrigerant. Then, sometimes the refrigerant is overfilled. On the other hand, the thermistors disclosed in Japanese Examined Patent Publication No. 61-14430 and Japanese Utility Model Laid-Open No. 63-10366 are for detecting a shortage of the refrigerant, and are not for properly filling the refrigerant. An object of the present invention is to provide a system capable of appropriately filling a refrigerant.

[Means for Solving the Problems]

A refrigerant proper filling system for an automobile air conditioner according to the present invention is driven by an automobile engine, a compressor for compressing the refrigerant, a condenser for condensing the refrigerant compressed by the compressor, and an expansion for the refrigerant condensed by the condenser. When filling the vehicle air-conditioning system including the expansion device for cooling medium, a device for determining the proper filling amount of the cooling medium, provided in the refrigerant pipe from the concentrator to the expansion device, Detecting means for detecting the gas-liquid mixing ratio of the refrigerant passing through the pipe, and the gas-liquid mixing ratio detected by the detecting means indicates that the refrigerant changes from the gas-liquid mixed state to the liquid state, Stop means for stopping the operation of the compressor.

[Action]

The detection means is provided in the refrigerant pipe extending from the condenser to the expansion device, and detects the gas-liquid mixing ratio of the refrigerant passing through the refrigerant pipe. When the refrigerant is filled, the refrigerant in the refrigerant pipe changes from the gas-liquid mixed state to the liquid state. Therefore, when the detection means detects that the refrigerant changes from the gas-liquid mixed state to the liquid state, the stop means stops the operation of the compressor.

【Example】

Hereinafter, the present invention will be described with reference to the drawings. Referring to FIG. 1, a refrigerant proper filling system according to an embodiment of the present invention is applied to a vehicle air conditioner described below. The air conditioner for an automobile is driven by an engine (not shown) of the automobile and has a compressor 11 for compressing the refrigerant and a condenser 12 for condensing the refrigerant compressed by the compressor 11.
A receiver 13 for separating the refrigerant condensed in the condenser 12 into a gas-phase refrigerant and a liquid-phase refrigerant; a throttle device 14 for expanding the liquid-phase refrigerant separated by the receiver 13; and an expansion device 14 for expanding the refrigerant. And the evaporator 15 for evaporating the refrigerant, and the refrigerant evaporated by the evaporator 15 is supplied to the compressor 11. During the operation of the automobile air conditioner, the air conditioner controller 16
Is controlled as described below. A sensor 17 for detecting the gas-liquid mixing ratio of the refrigerant passing through the passage is attached to the outlet passage of the receiver 13. The sensor 17 has
For example, a self-heating type thermistor that utilizes the difference in thermal conductivity between the gas and liquid of the refrigerant or an optical sensor that detects the mixing ratio of the gas and liquid of the refrigerant by the amount of light transmission is used. Sensor 17
The gas-liquid mixture ratio of the refrigerant detected in step 3 is supplied to the cooling device controller 16 via the switching terminal 17a. Cooling device control device
16 is a compressor driving clutch 1 via a switching terminal 18a
It is connected to the exciting coil 18 of 1a. Air conditioner controller 16
Is, based on the gas-liquid mixture ratio of the refrigerant detected by the sensor 17, determines whether the vehicle cooling device is operating normally or in an abnormal state, when the abnormal state, to stop the operation of the compressor 11 At the same time, the lamp 19 is turned on. The refrigerant proper filling system of the present embodiment is a filling device described later.
The purpose of this is to determine an appropriate filling amount of the refrigerant when the refrigerant is filled in the vehicle cooling device by 20. The filling device 20 includes a refrigerant tank 21, a valve 22, and a refrigerant tank 21.
It has a refrigerant charging terminal 20a for charging the refrigerant therein into a vehicle cooling device via a valve 22, and a charging checker device 23 connected to the switching terminals 17b and 18b. When filling the vehicle air conditioner with the refrigerant, first, the sensor
17 is connected to the switching terminal 17b and the exciting coil 18 is connected to the switching terminal 18b.
And connect the refrigerant charging terminal 20a of the charging device to the compressor 1
It is connected to the refrigerant pipe between 1 and the evaporator 15. After that, the filling checker device 23 operates the compressor 11.
As a result, the refrigerant is filled in the vehicle cooling device. During this filling, the filling checker device 23 monitors the gas-liquid mixing ratio of the refrigerant detected by the sensor 17 via the switching terminal 17b.
When the sensor 17 detects that the refrigerant changes from the gas-liquid mixed state to the liquid state, the filling checker device 23 stops the operation of the compressor 11. Thus, in the refrigerant pipe from the condenser 12 to the expansion device 14, the sensor 17 for detecting the gas-liquid mixture ratio of the refrigerant passing through the medium pipe is provided, and the gas-liquid mixture ratio detected by the sensor 17 is the refrigerant. When the change from the gas-liquid mixed state to the liquid state is shown, the filling checker device 23 stops the operation of the compressor 11, so that the refrigerant can be filled appropriately. Although the filling checker device 23 and the cooling device control device 16 are configured as separate units in the above description, it goes without saying that the cooling checker device 23 may be included in the cooling device control device 16.

[Effect of device]

As is apparent from the above description, according to the present invention, the refrigerant pipe extending from the condenser to the expansion device is provided with the detection means for detecting the gas-liquid mixture ratio of the refrigerant passing through the refrigerant pipe, and the detection means detects the gas-liquid mixture ratio. When the gas-liquid mixture ratio indicated indicates that the refrigerant changes from the gas-liquid mixed state to the liquid state, the stop means stops the operation of the compressor, so that the refrigerant can be appropriately charged. effective.

[Brief description of drawings]

FIG. 1 is a view showing a refrigerant proper filling system for an automobile air conditioner according to the present invention. 11 …… Compressor, 12 …… Condenser, 13 …… Receiver, 14 …… Throttle device, 17 …… Sensor, 23 …… Filling checker device.

Claims (1)

[Scope of utility model registration request] 1. A vehicle including a compressor driven by an engine of an automobile to compress the refrigerant, a condenser for condensing the refrigerant compressed by the compressor, and a throttle device for expanding the refrigerant condensed by the condenser. In the system for appropriately filling the refrigerant in the cooling device for cooling, the system is provided in the refrigerant pipe from the condenser to the expansion device, and the gas-liquid mixing ratio of the refrigerant passing through the refrigerant pipe is Detecting means for detecting, and stop means for stopping the operation of the compressor when the gas-liquid mixing ratio detected by the detecting means indicates that the refrigerant changes from the gas-liquid mixed state to the liquid state. A refrigerant suitable filling system for an automobile air conditioner having the same.