JPS60171372A - Alarm device for over-encapsulation of refrigerant - 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 Field of the Invention The present invention relates to a refrigerant overfill warning device suitable for use in various types of cooling devices including automobile cooling devices.

Conventional automotive cooling systems are assembled into finished vehicles afterward, so
After the various functional parts that make up the cooling system are mounted on the vehicle, refrigerant is charged into the refrigeration system while the engine is running in idle mode. Determination is supplementary and depends solely on the operator's intuition (currently, the refrigerant is sealed. Therefore, the state of overfilling of refrigerant can be determined by actually driving the vehicle and operating the cooling system for the required time. Although it is often discovered, the average driver has no way of knowing that refrigerant is overfilled.For this reason, if refrigerant is overfilled, liquid phase refrigerant may overflow from the liquid tank in the refrigeration cycle. If the condensate escapes and accumulates inside the condenser, the normal heat dissipation function of the condenser is inhibited, and the temperature at the cold edge does not drop much, reducing the refrigerating capacity of the entire cycle and reducing the effectiveness of the air conditioner. First, there was a problem where liquid bank could build up in the compressor and damage the compressor.

Purpose of the Invention In view of the above-mentioned conventional situation, an object of the present invention is to provide a refrigerant overfill warning device that can easily detect overfilling of refrigerant and prevent damage to cooling equipment. It is something to do.

To achieve the above object, the present invention includes a sensor for detecting the degree of supercooling of the refrigerant, which is disposed in the refrigerant passage between the condenser and the expansion valve, and is based on the detection action of this sensor. All works of notification means! I try to soak it for 1 hour.

Example Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

8 in Figure 1, 1 is a compressor, 2 is a capacitor,
3 is a liquid tank, 4 is an expansion valve, and 5 is an evaporator. Gaseous refrigerant compressed by a compressor 1 is cooled by a condenser 2, liquefied, and collected in a liquid tank 3. The liquid phase refrigerant in this liquid tank 3 is expanded by an expansion valve 4 and sent to an evaporator 5, where it exchanges heat with the indoor air and then sent to a compressor and tube 1, where a refrigeration cycle is formed. do. A refrigerant passage 6 between the condenser 2 and the expansion valve 4, for example, between the liquid tank 3 and the expansion valve 4, is provided with a sensor 10 for detecting the full degree of subcooling of the refrigerant flowing through the passage 6. The detection function of the sensor 10 lights up a notification means, for example, an alarm lamp 11.

Overfilling of refrigerant is manifested as the amount of subcooling, that is, the degree of supercooling, due to the operation of the refrigeration cycle. Overfilling can be easily determined. The sensor 10 that detects the degree of cooling is located at 2F.
As shown in Figure z1, a temperature sensing section 15 filled with a gas 16 that expands and contracts with temperature changes, and a tire flannel 17 that operates by the expansion and contraction of the gas,
The town identified in Diafurano 17! 1lII contact 18
a, a fixed contact 181 provided opposite to the removable b contact 18a;
), and the temperature sensing part 15 is arranged to protrude into the refrigerant passage 6. This sensor 10 detects that the refrigerant flowing through the refrigerant passage 6 is a saturated liquid.
When the refrigerant is cooled further below the saturated liquid temperature (cooling beyond the saturated liquid line in the Mollier diagram), the expansion of the filled gas 16 causes the switch part 1B to be in the on state. The switch section 18 is turned off to detect the degree of supercooling, that is, whether or not the refrigerant is overfilled. 1st
In the figure, reference numeral 12 indicates a relay that turns the switch section 18 of the sensor lO off (or on), 13 indicates an air conditioner switch, and 14 indicates a battery.

Next, the operation of the above embodiment apparatus will be explained.

If the amount of refrigerant charged in the refrigeration cycle is appropriate, the degree of supercooling will be 0.
Therefore, with such an appropriate amount of filling, the sensor 10
The switch section 18 is in the on state and the alarm lamp 11 remains off.

If the younger sister is overfilled, the refrigerant becomes even lower than the saturated liquid temperature and the degree of supercooling appears, so the sensor 10
The temperature sensing part 15 is cooled and the sealed gas 16 contracts, sucking the diaphragm 17 and turning off the switch part 18.

When the switch section 18 is turned off, the relay 12 is turned on and the warning lamp 11 is turned on to notify the driver that the refrigerant is overfilled.

It goes without saying that the present invention is not limited to cooling devices for automobiles, but can be applied to various types of cooling devices as required.

Effects of the Invention As described above, according to the present invention, overfilling of refrigerant in a refrigeration-ν-cycle can be easily prevented by cooperation of a subcooling degree sensor and a notification means such as an alarm rung. This has a great practical effect in that when refrigerant is overfilled, the refrigeration cycle is stopped and the refrigerant is drained to the appropriate amount, thereby preventing deterioration of the cooling effect and furthermore preventing damage to the compressor due to liquid back. has.

[Brief explanation of drawings]

FIG. 1 is a refrigeration system diagram of a cooling device employing an embodiment of the present invention, and FIG. 2 is a sectional view showing an example of a sensor. 1... Compressor, 2... Capacitor, 3...
Liquid tank, 4... Expansion valve, 5... Evaporator, 6... Refrigerant passage, 10... Sensor, 11...
Notification means. 2 people outside

Claims (1)

[Claims] (1) 1' between the content and the expansion valve? A refrigerant overfill warning device includes a sensor disposed in a T passage and detects the degree of subcooling t+A of the refrigerant in the passage, and a notification means activated based on the detection action of this sensor.