air conditioner

Abstract

The present application proposes an air conditioner, which includes an ambient temperature detection device for detecting the return air temperature and a coil temperature detection device for detecting the coil temperature. When the outlet air temperature meets the preset compensation condition, it is judged that temperature stratification has occurred in the room and the measured indoor ambient temperature needs to be compensated. During the temperature compensation process, the current coil compensation coefficient is determined according to the outlet air temperature, the angle compensation coefficient is determined according to the position or working state of the air guide plate, and the wind speed compensation coefficient is determined according to the working gear of the indoor fan. The above compensation coefficients are subjected to a first logical operation to obtain a compensated temperature value, and the compensated indoor ambient temperature is obtained 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; an indoor fan, which is provided on 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; 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; 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; 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; Calculate the compensated temperature value: T 补 =K_Fan*T_Tc+K_Angle Among them, T 补 is the compensation temperature value, K_Fan is the wind speed compensation coefficient, T_Tc is the coil compensation coefficient, and K_Angle is the angle compensation coefficient. The relationship between the coil compensation coefficient and the wind speed compensation coefficient in temperature compensation is a product relationship, and the effect of the angle compensation coefficient on temperature compensation is an addition and subtraction relationship. 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 detect the coil temperature and perform a second logical operation on the coil temperature to obtain a corrected coil temperature to correct for a temperature drop caused by rising hot air due to a density difference between the outlet airflow and the return airflow, and determine a coil compensation coefficient based on the corrected coil temperature, wherein the second logical operation is: Tc′=Tc-(Ts-k) Where Tc′ is the corrected coil temperature after compensation, Tc is the coil temperature, Ts is the set temperature, and k is the reference set temperature.

3. The air conditioner according to claim 1, characterized in that The controller is configured to operate the compressor at a certain frequency when the working gear of the indoor fan remains unchanged and two consecutive changes in the indoor ambient temperature are within a first temperature range; Get the coil temperature T of the last detection cycle c (0); The coil temperature is detected at a certain interval. When the detected coil temperature is equal to T c When the difference between the values ​​of (0) and (1) reaches the preset threshold, it is determined that the coil temperature has changed significantly at this time, and the detection time of the coil temperature that meets the condition and T c The difference in the detection time of (0) is defined as the variable detection period, and the new compensation temperature value is calculated; The coil temperature that meets the conditions is taken as the new T c (0); The above detection intervals are the same or different.

4. 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.

5. 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 reaches a lower limit of the 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.

6. 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 compressor stop period after the second temperature difference reaches a lower limit of a preset shutdown range.

7. The air conditioner according to any one of claims 1 to 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.

8. The air conditioner according to any one of claims 1 to 6, characterized in that: The indoor fan is provided with multiple gears, and a range value of the wind speed compensation coefficient is set. The highest gear of the indoor fan is set to correspond to the upper limit value of the above range value, and the lowest gear of the indoor fan is set to correspond to the lower limit value of the above range value. The other gears of the indoor fan are determined by interpolation method to determine the corresponding wind speed compensation coefficient.

9. 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; an indoor fan, which is provided on 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; 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; 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; 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 angular position of the air deflector; Determine the wind speed compensation coefficient according to the working gear of the indoor fan; Calculate the compensated temperature value: T 补 =K_Fan*T_Tc Among them, T 补 is the compensation temperature value, K_Fan is the wind speed compensation coefficient, and T_Tc is the coil compensation coefficient; The compensation temperature value is proportional to the product of the coil compensation coefficient and the wind speed compensation coefficient; 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.

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