air conditioner

Abstract

The present application proposes an air conditioner, which includes an ambient temperature detection device, a coil temperature detection device and an indoor fan with multiple working gears that can be steplessly adjusted. When the outlet air temperature meets the preset compensation condition, it is judged that temperature stratification has occurred indoors and temperature compensation is required. During the temperature compensation process, a first logical operation is performed based on the coil compensation coefficient, the angle compensation coefficient and the wind speed compensation coefficient to obtain a compensated temperature value, and the compensated indoor ambient temperature is obtained accordingly. The gear of the indoor fan is determined according to the difference between the compensated indoor ambient temperature and the set temperature, and the indoor ambient temperature is adjusted accordingly. The frequency of the compressor is adjusted according to a second temperature difference between the compensated indoor ambient temperature and the set temperature, and the compressor is turned off when the second temperature difference meets the preset shutdown range.

Claims

1. An air conditioner, characterized in that: include: An indoor unit is installed at the top or upper part of the room, and includes a return air inlet and an air outlet communicating with the room; the return air inlet and the air outlet are arranged above the user activity area; A refrigerant circulation loop, wherein the refrigerant circulates in a loop consisting of a compressor, a condenser, an expansion valve, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; An ambient temperature detection device, which is provided at the return air outlet, is used to detect the return air temperature and define the return air temperature as the measured indoor ambient temperature to provide a base for subsequent temperature compensation; a coil temperature detection device, which is provided on the indoor heat exchanger, for detecting the coil temperature of the indoor heat exchanger, defining the coil temperature as the air outlet temperature, and performing temperature compensation accordingly; an indoor fan, which is provided at the indoor heat exchanger near the return air port or the air outlet, and is used to deliver the heat-exchanged air into the room, the indoor fan having a plurality of operating gears, and the operating gear of the indoor fan is adjusted according to the difference between the indoor ambient temperature before or after compensation and the set temperature, so as to perform stepless regulation; an air guide plate disposed at the air outlet, the air guide plate adjusting the outflow direction of the air flowing through the air outlet by changing the relative rotation angle between the air guide plate and the air outlet; The controller is configured to: after receiving a heating signal, when the outlet air temperature is within a set range [Tcmin, Tcmax], determine that the indoor temperature is stratified at this time, and perform temperature compensation on the measured indoor ambient temperature; Determining a current coil compensation coefficient based on the outlet air temperature; dividing the preset compensation conditions into n gears, and setting a range value of the coil compensation coefficient; wherein the effect of the coil temperature of the indoor heat exchanger on temperature compensation is converted into the coil compensation coefficient T_Tc; the range value of the coil compensation coefficient is [T_Tc-L, T_Tc-H], Tcmin corresponds to the coil compensation temperature value T_Tc-L, and Tcmax corresponds to the coil compensation temperature value T_Tc-H. The coil compensation coefficient T_Tc for coil temperatures between Tcmin and Tcmax is obtained using an interpolation method; wherein Tcmin is set based on the temperature limit when the room is stratified, and Tcmax is based on the reliability and cooling performance constraints of the refrigeration system; Determine the angle compensation coefficient according to the angle of the air deflector; Determine the wind speed compensation coefficient according to the working gear of the indoor fan; performing a first logical operation based on the coil compensation coefficient, the angle compensation coefficient, and the wind speed compensation coefficient to obtain a compensated temperature value, and compensating the measured indoor ambient temperature accordingly to obtain a compensated indoor ambient temperature; The first operation logic is: in, To compensate for the temperature value, is the wind speed compensation coefficient, is the coil compensation coefficient, is the angle compensation coefficient; in the first logical operation, the relationship between the coil compensation coefficient and the wind speed compensation coefficient in temperature compensation is a product relationship, and the influence of the angle compensation coefficient on temperature compensation is an addition and subtraction relationship; During the temperature compensation period, the compensated indoor ambient temperature is obtained at a certain period, and the working gear of the indoor fan is steplessly adjusted according to the difference between the compensated indoor ambient temperature and the set temperature; Determining a new wind speed compensation coefficient according to the adjusted working gear, and recalculating a new compensation temperature value to obtain a new compensated indoor ambient temperature; The frequency of the compressor is adjusted according to a second temperature difference between the compensated indoor ambient temperature and the set temperature, and the compressor is turned off when the second temperature difference meets a preset shutdown range.

2. The air conditioner according to claim 1, characterized in that The controller is configured to prohibit the indoor fan from reducing its operating gear when the coil temperature reaches the difference between the overload protection value and the first preset threshold and / or the exhaust temperature reaches the difference between the exhaust temperature protection value and the third preset threshold during stepless speed regulation of the indoor fan.

3. The air conditioner according to claim 2, characterized in that The controller is configured to: when the coil temperature does not reach the difference between the overload protection value and the first preset threshold and the exhaust temperature does not reach the difference between the exhaust temperature protection value and the third preset threshold, perform stepless adjustment of the working gear of the indoor fan normally.

4. The air conditioner according to claim 1, characterized in that The controller is configured to: when the air conditioner is operating in a cooling mode and the indoor fan is being steplessly regulated, prohibit downshifting the working gear of the indoor fan when the coil temperature does not exceed the sum of the freezing protection value and a second preset threshold; Otherwise, the indoor fan's working gear is adjusted steplessly normally.

5. The air conditioner according to any one of claims 2 to 4, characterized in that: During the stepless speed regulation of the indoor fan, when the difference between the calculated new working gear and the current working gear is greater than a preset range, the number of single adjustment gears of the indoor fan cannot exceed the set number of gears.

6. The air conditioner according to claim 1, characterized in that The controller is configured to calculate the current new compensation temperature value when the working gear of the indoor fan and / or the angle of the air guide plate changes, and periodically increase or decrease the previous compensation temperature value to switch the compensation temperature value to the new compensation temperature value, thereby adjusting the compensated indoor ambient temperature so that the change range of the indoor ambient temperature is within a third temperature range.

7. The air conditioner according to claim 1, characterized in that The controller is configured to: upon receiving a heating signal, adjust the operating frequency of the compressor so that the compensated indoor ambient temperature gradually approaches or exceeds a set temperature, and control the compressor to shut down when a second temperature difference between the compensated indoor ambient temperature and the set temperature meets a lower limit of a preset shutdown range; Before the compressor stops, the working gear of the indoor fan and the angle of the air guide plate remain unchanged; When the compressor is stopped, the indoor fan operates at a certain speed, and the air guide plate rotates so that the air blown out of the air outlet does not blow towards the user activity area.

8. The air conditioner according to claim 5, characterized in that The controller is configured to continue temperature compensation according to the compensation temperature value before the compressor is stopped during the period when the compressor is stopped after the second temperature difference satisfies a preset shutdown range.

9. The air conditioner according to any one of claims 1 to 4 or 6, characterized in that: The controller is configured to: during the shutdown period of the compressor, when the shutdown time of the compressor reaches a certain time and the compressor is still not started, adjust the indoor ambient temperature to offset the first set temperature downward; Thereafter, the compensated indoor ambient temperature is biased downward once at a certain interval until the compressor is started again, wherein each interval time is the same or different, and each downward biased temperature is the same or different.

10. An air conditioner, characterized in that: include: An indoor unit is installed at the top or upper part of the room, and includes a return air inlet and an air outlet communicating with the room, wherein the return air inlet and the air outlet are arranged above the user activity area; A refrigerant circulation loop, wherein the refrigerant circulates in a loop consisting of a compressor, a condenser, an expansion valve, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; An ambient temperature detection device, which is provided at the return air outlet, is used to detect the return air temperature and define the return air temperature as the measured indoor ambient temperature to provide a base for subsequent temperature compensation; a coil temperature detection device, which is provided on the indoor heat exchanger, for detecting the coil temperature of the indoor heat exchanger, defining the coil temperature as the air outlet temperature, and performing temperature compensation accordingly; an indoor fan, which is provided at the indoor heat exchanger near the return air port or the air outlet, and is used to deliver the heat-exchanged air into the room, the indoor fan having a plurality of operating gears, and the operating gear of the indoor fan is adjusted according to the difference between the indoor ambient temperature before or after compensation and the set temperature, so as to perform stepless regulation; The controller is configured to: after receiving a heating signal, when the outlet air temperature is within a set range [Tcmin, Tcmax], determine that the indoor temperature is stratified at this time, and perform temperature compensation on the measured indoor ambient temperature; Determining a current coil compensation coefficient based on the outlet air temperature; dividing the preset compensation conditions into n gears, and setting a range value of the coil compensation coefficient; wherein the effect of the coil temperature of the indoor heat exchanger on temperature compensation is converted into the coil compensation coefficient T_Tc; the range value of the coil compensation coefficient is [T_Tc-L, T_Tc-H], where Tcmin corresponds to the coil compensation temperature value T_Tc-L, and Tcmax corresponds to the coil compensation temperature value T_Tc-H. The coil compensation coefficient T_Tc for coil temperatures between Tcmin and Tcmax is obtained using an interpolation method; Among them, Tcmin is set according to the temperature limit when the room is stratified, and Tcmax is based on the reliability and cooling performance constraints of the cooling system; Determine the wind speed compensation coefficient according to the working gear of the indoor fan; performing a second logical operation based on the coil compensation coefficient and the wind speed compensation coefficient to obtain a compensated temperature value, and compensating the measured indoor ambient temperature accordingly to obtain a compensated indoor ambient temperature; The second logical operation is: in, To compensate for the temperature value, is the wind speed compensation coefficient, is the coil compensation coefficient; in the second logical operation, the compensation temperature value is proportional to the product of the coil compensation coefficient and the wind speed compensation coefficient; During the temperature compensation period, the compensated indoor ambient temperature is obtained at a certain period, and the working gear of the indoor fan is steplessly adjusted according to the difference between the compensated indoor ambient temperature and the set temperature; Determining a new wind speed compensation coefficient according to the adjusted working gear, and recalculating a new compensation temperature value to obtain a new compensated indoor ambient temperature; The frequency of the compressor is adjusted according to a second temperature difference between the compensated indoor ambient temperature and the set temperature, and the compressor is turned off when the second temperature difference meets a preset shutdown range.

Images