CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on and claims the benefit of priority from Chinese Patent Application No. 2020101001613, filed on Feb. 18, 2020, the entirety of which is incorporated by reference herein.

TECHNICAL FIELD

The present disclosure relates to the field of refrigeration device technologies, and specifically, to a compressor control system and an air conditioner for wide-range temperature adjustment.

BACKGROUND

An air conditioner complies with the following principle: A compressor compresses a gas refrigerant into a high-temperature and high-pressure gas refrigerant, and transfers the gas refrigerant to a condenser of an air conditioner outdoor unit to become a liquid refrigerant. The liquid refrigerant enters an evaporator through a capillary tube to absorb heat in indoor air and is then vaporized into the gas refrigerant. The gas refrigerant is transferred back to the compressor for further compression, thereby continually performing cyclic refrigeration.

An existing air conditioner can implement a freezing function after being improved, that is, enable a lowest refrigeration temperature to be less than 0° C. However, as shown inFIG. 1, a compressor of the existing air conditioner is electrically connected to a main board, and the main board is electrically connected to an indoor ambient temperature-based negative temperature coefficient (NTC) thermistor. The indoor ambient temperature-based NTC thermistor transmits, based on a specified operating state, a resistance that varies with a detected indoor ambient temperature, so as to automatically start or stop, or convert a frequency. When an indoor ambient temperature is less than 15° C., a resistance of the indoor ambient temperature-based NTC thermistor used on the existing air conditioner increases. Consequently, a low-level signal is transmitted to the main board, and the compressor is controlled to stop working. In other words, the compressor does not perform refrigeration at an ambient temperature lower than 15° C., and cannot meet a demand of implementing the freezing function by transforming a common household air conditioner to perform refrigeration in a small confined space to reach a subzero temperature.

SUMMARY

The present disclosure is to resolve at least one of the technical problems in related technologies to some extent. For this, the present disclosure provides a compressor control system and an air conditioner for wide-range temperature adjustment, so that a compressor can operate normally at an indoor temperature less than 0° C., and a common air conditioner can be transformed to have a freezing function.

According to embodiments of a first aspect of the present disclosure, a compressor control system includes a power supply, configured to generate a power input voltage; a compressor, where a power voltage input circuit is disposed between the compressor and the power supply; a main board, electrically connected to the power voltage input circuit, where during operation, the main board is configured to control connection and disconnection of the power voltage input circuit; and a first temperature sensor, configured to detect an indoor temperature, where the first temperature sensor is electrically connected to the main board and transmits an electrical signal to the main board, and the first temperature sensor is electrically connected to a first fixed-value resistor.

The compressor control system according to the embodiments of the present disclosure has at least the following technical effect: The first temperature sensor is electrically connected to the first fixed-value resistor, and a resistance of the first fixed-value resistor is a constant. Relative to a characteristic that a resistance of an existing indoor ambient temperature-based NTC thermistor decreases with a temperature rise and increases with a temperature drop, the resistance of the first fixed-value resistor corresponding to the first temperature sensor does not change with a temperature rise or drop, so that the electrical signal transmitted by the first temperature sensor to the main board is always a high-level signal, and after the indoor temperature falls below 15° C., the main board does not control the power voltage input circuit to be disconnected. It is ensured that when the indoor temperature is lower than 0° C., the main board can still control the power voltage input circuit to be connected, so that the compressor can operate normally at an indoor temperature lower than 0° C., thereby providing a condition for transforming a common air conditioner into an air conditioner with the freezing function.

According to some embodiments of the present disclosure, a first temperature sensing probe is disposed at one end of the first temperature sensor, the first fixed-value resistor is disposed in the first temperature sensing probe, and a first male connector is disposed at an end of the first temperature sensor that is away from the first temperature sensing probe; and a first female connector that matches the first male connector is disposed on the main board.

According to some embodiments of the present disclosure, a resistance of the first fixed-value resistor is equal to a resistance of an indoor ambient temperature-based NTC thermistor at 25° C.

According to some embodiments of the present disclosure, a first relay is disposed in the power voltage input circuit, the first relay is electrically connected between the main board and the compressor, and upon power-on, the main board controls the first relay to close, so that the compressor accesses the power supply through the power voltage input circuit.

According to some embodiments of the present disclosure, an intelligent temperature controlled switch is serially connected on a circuit between the power supply and the first temperature sensor, and when an indoor temperature reaches a specified refrigeration temperature, the intelligent temperature controlled switch controls the compressor to stop operation.

According to some embodiments of the present disclosure, the compressor control system further includes a coil temperature sensor for detecting a tube wall temperature of at least one of an evaporator and a condenser, where a second fixed-value resistor is disposed in the coil temperature sensor, and the coil temperature sensor is electrically connected to the main board and transmits an electrical signal to the main board.

According to some embodiments of the present disclosure, the compressor control system further includes a third temperature sensor for detecting an aluminum fin temperature of the evaporator and/or the condenser, where the third temperature sensor is electrically connected to a third fixed-value resistor, and the third temperature sensor is electrically connected to the main board and transmits an electrical signal to the main board.

According to some embodiments of the present disclosure, a coil temperature sensing probe is disposed at one end of the coil temperature sensor, the second fixed-value resistor is disposed in the coil temperature sensing probe, the other end of the coil temperature sensor is connected to a second male connector, and a second female connector that matches the second male connector is disposed on the main board; and a third temperature sensing probe is disposed at one end of the third temperature sensor, the third fixed-value resistor is disposed in the third temperature sensing probe, and the other end of the third temperature sensor is electrically connected to the second male connector.

According to some embodiments of the present disclosure, a resistance of the second fixed-value resistor is equal to a resistance of a coil temperature-based NTC thermistor at 25° C.; and a resistance of the third fixed-value resistor is equal to the resistance of the coil temperature-based NTC thermistor at 25° C.

According to embodiments of a second aspect of the present disclosure, an air conditioner for wide-range temperature adjustment includes a compressor, an evaporator, and a condenser that are sequentially connected through a duct to form a circulation loop, where an expansion valve is disposed between the evaporator and the condenser, and the compressor is controlled by any one of the foregoing control systems.

The air conditioner for wide-range temperature adjustment according to the embodiments of the present disclosure has at least the following technical effect: The first temperature sensor is electrically connected to the first fixed-value resistor, and the resistance of the first fixed-value resistor is a constant. Relative to a characteristic that a resistance of an existing indoor ambient temperature-based NTC thermistor decreases with a temperature rise and increases with a temperature drop, the resistance of the first fixed-value resistor corresponding to the first temperature sensor does not change with a temperature rise or drop, so that the electrical signal transmitted by the first temperature sensor to the main board is always a high-level signal, and after the indoor temperature falls below 15° C., the main board does not control the power voltage input circuit to be disconnected. It is ensured that when the indoor temperature is lower than 0° C., the main board can still control the power voltage input circuit to be connected, so that the compressor can operate normally at an indoor temperature lower than 0° C. Further, in this way, the air conditioner in the embodiments of the present disclosure can perform refrigeration for the indoor temperature to fall below 0° C., featuring a wide temperature adjustment range. Compared with an existing common household air conditioner, the air conditioner in the embodiments of the present disclosure can not only implement a common refrigeration function but also be used as a freezer to perform refrigeration in a small confined space to reach −20° C.

Some additional aspects and advantages of the present disclosure are provided in the following descriptions, are clear in the following descriptions, or are understandable through practice of the present disclosure.

