JPS602009Y2 - Automotive air conditioner - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air conditioner for an automobile that can detect refrigerant leakage in a vehicle interior.

Conventionally, there has been no simple means to detect refrigerant leaks, even though automotive air conditioners are prone to refrigerant leaks due to their structure.

For this reason, the user operates the automobile air conditioner in a state where the refrigerant is insufficient, depending on the intuitive judgment of the degree of cooling, etc., which has the disadvantage of adversely affecting the compressor.

This invention has been developed in consideration of the above points, and an object of the present invention is to provide an air conditioner for a vehicle that allows the driver to easily detect refrigerant leaks in the vehicle interior.

Hereinafter, one embodiment of the automotive air conditioner of this invention will be described based on the drawings.

The figure is a circuit diagram showing the configuration of one embodiment.

1 in the figure is a pressure sensing contact, and a sensing element (not shown)
Built-in.

The pressure sensing contact 1 and the relay coil 2 are connected in series to form a series circuit.

Both ends of this series circuit are connected to a power supply.

The relay coil 2 controls the opening and closing of the normally closed point 5, and this contact 5 and the compressor clutch coil 3 are connected in series to form a compressor clutch circuit 6.

Both ends of this compressor clutch circuit 6 are connected to a power source (not shown).

On the other hand, 7 is a controller.

A resistor element 8 such as a thermistor that sends a signal to the controller 7 is connected to the controller 7, and a plurality of light emitting diodes 4 as display means are also connected.

This light emitting diode 4 is for displaying the temperature sensed by the resistive element 8 to the driver.

Further, the controller 7 receives a signal from between the pressure sensing element 1 and the relay coil 2 described above.

Next, the operation of the automotive cooling system of this invention constructed as described above will be explained.

The pressure of the refrigeration cycle is sensed by a sensing element, and the detected output is compared with a predetermined pressure such as the refrigeration cycle volume and the specified amount of refrigerant, and if it is determined that there is a refrigerant leak, the pressure sensing contact 1 closes. , a current flows through the relay coil 2, a potential is applied to the controller 7, and several light emitting diodes 4 blink.

Then, the contact point 5 on the clutch side of the compressor is opened, and the clutch is disconnected from the compressor (none of which is shown).

As a result, if the refrigerant leak warning display is displayed when the electric circuit is closed when the car is started, the refrigeration cycle has stopped, which not only makes it easier to detect refrigerant leaks, but also makes it easier to operate the car's air conditioner. The advantage is that a warning of refrigerant leakage can be displayed before the refrigerant leakage occurs.

As described above, according to the automotive air conditioner of this invention, the warning display for detecting a refrigerant leak in the refrigeration cycle can be easily seen from the driver's seat, and the automotive air conditioner can be operated without refrigerant. In addition to being able to detect a lack of refrigerant even when the compressor is not operating, it has the excellent effect of giving a warning to the operator and turning off the compressor's electrical circuit. It is.

[Brief explanation of the drawing]

The figure is a circuit diagram of an embodiment of the automobile air conditioner of this invention. 1...Pressure sensing contact, 2...Relay coil, 3...Compressor clutch coil, 4...
...Light-emitting diode, 5...Contact, 6...
. . . Compressor clutch circuit, 7 . . . Controller, 8 . . . Resistance element.

Claims (1)

[Scope of utility model registration request] In a compressor-type air conditioner driven by the main motor of an automobile, the pressure of the refrigerant in the refrigeration cycle is detected by a sensing element, and the detected output is compared with a preset pressure and shuts down if it is determined that there is a refrigerant leak. a pressure-sensing contact that forms a compressor clutch circuit together with a compressor clutch coil, and is energized when the pressure-sensing contact is closed, causing the contact to open and deenergizing the compressor clutch coil. relay coil that disconnects the clutch from the compressor.
An air conditioner for an automobile, comprising: a controller which, when the pressure sensing contact is closed, causes a voltage to rise and activates a plurality of light emitting diode display means to indicate a refrigerant leak.