JPS59155584A - Temperature control device for compressor - Google Patents

Abstract

PURPOSE:To ensure the operating condition of the device by stopping the driving of the device once when the temperature abnormality of the compressor is detected and re-starting it automatically after the temperature is returned to a normal value. CONSTITUTION:A temperature sensor B, detecting the discharge gas temperature of the compressor, is incorporated integrally into the compressor and the output of the temperature sensor B is inputted into a comparating circuit C comparing the output of the temperature sensor B with a reference voltage while the comparating circuit C outputs a signal putting an output relay E ON or OFF. According to this method, when the temperature of the compressor, normally equipped in a cooling device, is increased abnormally, the driving of the device is stopped once and it may be re-started automatically when the temperature returns to a normal condition, therefore, troublesome operation, such as exchanging of a fuse or the like, will never be requested and the device may be operated surely.

Description

[Detailed Description of the Invention] The present invention detects an abnormality in the temperature of the cooling compressor that is always installed in the air conditioning system of automobiles, etc., stops the device from operating, and automatically restarts after the temperature returns to normal. The present invention relates to a temperature Il control device that can control temperature Il.

Conventional cooling systems commonly used in automobiles use refrigerants such as Freon to perform a refrigeration cycle of gas → liquid → gas, and use the heat of vaporization generated to cool the interior of the passenger compartment. This is well known. The above configuration will be described in more detail.

As shown in FIG.
A condenser 2 that cools and liquefies a high-pressure, high-temperature gaseous refrigerant; an expansion knob 3 that transforms this high-pressure liquid refrigerant into a mist of low-pressure liquid refrigerant by a throttling action and sends it to the evaporator; Evaporator 4 that acts to remove vaporization heat 2 from the surroundings by evaporating
By repeating such a refrigeration cycle, air conditioning is performed inside the Kaijian (1).If we focus on the compressor 1, which is one of the main components of this cooling system, its type is a reciprocating type. type compressor, rotary set compressor as the main power, and other gear pump type compressor.

There are single-cord power compressors, scroll type compressors, etc., and they can be categorized as needed.

- The compressor became overheated due to an unforeseen cause during continuous operation. If the compressor is operated continuously without realizing it, it will cause equipment failure, so avoid such a situation. In order to prevent this, one method is to attach a temperature fuse to one end of the compressor and use the fact that the fuse breaks when it becomes red hot to shut down the device. However, if such a method is used.

Once an abnormal temperature is detected and the fuse is disconnected.

Even after the temperature has returned to the normal range and the cause of the temperature abnormality has been removed, the machine cannot be restarted until then.
In addition, in order to restart the water, it is necessary to replace the fuse and perform a restart operation. 1. The present invention solves the above-mentioned σ) in which VC tends to occur during the continuation of the conventional refrigeration cycle. The purpose of this system is to provide a temperature control device that can automatically restart the compressor when the temperature returns to the normal range. A temperature sensor that detects a change in resistance value, and a change in resistance value ytfM of the temperature sensor.

A resistance-voltage converter that converts into a positive value change, and the resistance =? [
It has a plurality of comparison circuits that compare the output voltage from the pressure converter with a preset reference pressure, and a link drive circuit that applies the voltage to the output compressor drive relay of the comparison circuit, The compressor drive relay is controlled by this relay drive circuit.

It features the ability to start, stop, and restart the compressor. The object of the present invention is to obtain a temperature control device 2 for a compressor.

Detailed explanation 2 of the present invention will be given below based on the drawings.

FIG. 2 is a schematic block diagram showing the configuration of the present invention, and in FIG. 5, A is a temperature sensor, and B is a temperature sensor.

The temperature sensor B is integrated with the compressor and is set to detect the temperature of the gas discharged from the compressor. C is the first comparison circuit, JlItI
The output from the temperature sensor B is compared with the base pressure input from the power source A, and a signal is output that turns the output relay E on or off. , 1711 When the temperature sensor B reaches the set temperature on the high temperature side, it emits a 'Low' signal to turn off the output relay E, and conversely, when the temperature detected by the 1.5 temperature sensor B is low. When the set temperature of width and height is reached, output relay E is turned on! :Rotame's "Hiqh"
'Give a signal. 4. When temperature sensor B is short-circuited,
Lovq "6 signals are emitted. D is the second comparison circuit, and when temperature sensor B is disconnected, K'
It is provided to generate a Lovv' signal. The output section E operates to stop and restart the compressor according to the output signals of the first and second comparators C and D. FIG. 3 shows the circuit configuration 2 and Embodiment 2 is shown, in which RTH is a constant thermistor employed as a temperature sensor, and is incorporated in the compressor 1, and changes in the temperature of the compressor 1 are detected as changes in resistance. It has a detection function. R, IR2, and R are resistance-voltage converters that convert a change in resistance value occurring in the thermistor RTH into a voltage value. Resistor R4 and capacitor C
8 is a protection circuit against high frequency surges, and R3 and R6 are resistors for setting the hysteresis width for the comparison artist.

. There are resistors R,,R on the negative terminal side of this comparative painter.

And the pressure set by capacitor C2 is applied. -The negative terminal side of the comparator (■) receives a signal from one end of the resistor-voltage converter through the resistor R4 and the resistor RCt.-The positive terminal side of this comparator (■) receives the resistor RI31RI4 and the capacitor. A base voltage set by Cs is applied. Note that the resistor R12 and the resistor R+i are resistors that set the hysteresis for the comparator 2, R,.

R7° and R1 are relay/contraction transistors, and Tr is a relay driving transistor, and the output of this transistor is connected to the output relay RyK via a low frequency surge absorbing Zener diode ZD+2. R+6 is sour resistance +-
ZD2 and c4 are Zener diodes and capacitors for source pressure stabilization and high frequency surge suppression, D,
is a protection diode against reverse connection of the power supply.

The following describes the operation of the device according to the present invention having the above-mentioned configuration. 1. When the car cooler is operating based on the cooler cycle mentioned at the beginning, if the compressor becomes overheated due to an unexpected cause. .

The resistance value of the thermistor RTH decreases and the thermistor RTH senses the temperature rise Z1, which causes the output voltage of the resistance-voltage converter consisting of RH + R2 + R3 to decrease, and the voltage to the positive terminal of the comparison artist decreases. The input voltage becomes smaller than the base voltage to the same negative terminal,
The output of this comparator [σ] becomes 'Low', the output section relay Ry is turned off, and the drive of the header L/tube is automatically stopped. Note that even if the thermistor RTH is short-circuited, the output relay RV is turned off by a similar effect, so that the short-circuit of the thermistor can also be immediately detected.

Next, the compressor drive is stopped by the above operation, and when the temperature reaches the preset allowable temperature or lower, the resistance value of the thermistor RTH increases and the input to the positive jul+ terminal of the comparator I increases. voltage.

It becomes larger than the base voltage applied to the minus 9 All terminal, and the output of this comparative painter becomes 'H1gh'.

This output turns on relay/pivoting resistors R, O, transistor TrYg@L, and output relay R7, restarting the compressor.5, resistors R5 and R6 are compared -L! It is a resistance that determines the high temperature and low 7 product setting conditions for 5I, and by selecting it arbitrarily, the desired temperature condition can be determined. .

- What if the thermistor RTH breaks during the first renewal? If you think about it, the resistance value of the thermistor RTH becomes infinite, so the output of the comparator I will be "H1ghl/I/," so the comparator ■ is provided to prevent this rL. INII also has the output 4 of the resistance-voltage converter based on the disconnection of the thermistor RTH, which is input to the negative terminal of the comparator 2 via the resistor R+2.

When the pressure of the resistor R15Y becomes higher than the reference pressure marked 7JO to the positive terminal of the comparator (■), the comparator (■) emits IL2w"18, and immediately the output relay RyY OFF 1C. Therefore, thermistor RT
The disconnection of H can be detected by the comparator ■, and proper measures such as replacing the thermistor can be taken to normalize the #2 installation. Accidents can be prevented.

As can be understood from the above explanation of operation, the comparator I detects that the thermistor RTH deviates from the preset high and low temperature ranges and outputs a signal that immediately returns to the normal state. Short circuit 7a1'
On the other hand, the comparator (2) detects the disconnection of the thermistor RTH and immediately shuts down the compressor. Therefore, the mesh size σ during compressor operation is
〕Not only can it detect abnormalities, but it can also reveal the behavior of the temperature detection thermistor itself.
This provides a perfect mechanism for monitoring the vomiting state of the device.

As explained in detail above, according to the present invention, it is possible to temporarily stop the drive of the device by cooling it down and then restart it automatically after the temperature returns to the old line, so it is possible to replace the fuse, etc. This has the advantage of ensuring reliable operation of the equipment without requiring any tedious operations. Since it is possible to detect IS, etc., it is effective from the point of view of ensuring safety1.Also, when focusing on the circuit configuration, a dipping circuit with a Zener diode, a resistor, and a capacitor is provided for high frequency surges. Since a Zener diode is provided to deal with low frequency surges, the present invention is characterized in that it takes measures against surges peculiar to vehicles and also takes into consideration charging.1 As described above, the present invention The compressor used in the cooling system always maintains the optimum temperature.

This is extremely effective in terms of ensuring the operability and safety of the device.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a commonly used refrigeration cycle, FIG. 2 is a schematic block diagram showing the structure of the present invention, and FIG.
The figure is a circuit diagram showing a detailed embodiment 2 of the present invention. 1...Kombu V-Tsa, 2...Capacitor, 3...
Expansion pulp, 4... Evaporator, A.
・・Power supply section, B・°・Temperature sensor, C... 1st comparison circuit. D...Second comparison circuit, E...Output section relay 4, condolence l Figure 2

Claims (1)

[Scope of Claims] 111 A compressor that compresses refrigerant gas, a condenser that uses the compressor to raise the temperature to high pressure and liquefy the gas, and an expansion device that sends out the high-pressure liquid refrigerant as a mist of low-pressure liquid cooling! In the cooling system, which has a valve and this low-pressure liquid refrigerant fire evaporator evaporator as the main components, a WIF & sensor that detects a change in the opening degree of the compressor as a change in resistance value, and a low resistance value of the stripe-sensitive sensor. Change?Preset the output voltage from the resistor-pressure converter unit and the cough resistor-five-voltage converter unit that changes to the pressure value. The output of the comparison circuit is connected to the relay drive circuit that is connected to the compressor drive ring. This relay ringing circuit controls the compressor drive relay to drive the compressor. Stop and restart. Compressor temperature control device. (2) Comparison 1 is designed to simulate temperature changes in the compressor within a preset temperature range and to detect short circuits using a sensor. A temperature control device for a compressor according to claim 1, which includes a circuit configuration for detecting a disconnection (Z). ], compressor temperature control device.