Air conditioner indoor unit, operation control method and device thereof, and air conditioner unit

Abstract

The present invention discloses an air conditioner indoor unit, an operation control method and device thereof, and an air conditioner unit. The air conditioner indoor unit comprises a body, an air supply fan, an evaporator, a compressor, at least one electric heater, a solid-state relay, and a controller. The body comprises a return air port and an air supply port, and a ventilation duct connecting the return air port and the air supply port is provided inside the body. The evaporator, at least one electric heater, and the air supply fan are located on the ventilation duct, the solid-state relay is electrically connected to the at least one electric heater, the compressor is connected to the outlet of the evaporator, and the controller is connected to the solid-state relay and the compressor signal. The controller is used to: obtain the temperature and humidity of the machine room; and control the working state of the compressor and the output voltage of the solid-state relay according to the temperature and humidity of the machine room. The air conditioner indoor unit can realize stepless regulation of heating capacity, full load regulation of cooling capacity, and reduce the challenges of frequent start and stop and dehumidification and low temperature through reasonable control logic.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning indoor unit, an operation control method and device thereof, and an air conditioning unit. Background Art

[0002] With the promotion and development of the Internet, the market has higher and higher requirements for the number and quality of servers. Therefore, the internal chip integration of the server has gradually increased, resulting in a higher heat density. At the same time, the heat dissipation of other supporting facilities in the data center has also increased. Under such a large heat dissipation and heat dissipation density, the requirements for computer room air conditioners are very high. Computer room air conditioners need to ensure that the temperature and humidity of the entire computer room are stable and uniform during operation under various working conditions throughout the year while ensuring the heat dissipation requirements, and minimize energy consumption and reduce the PUE of the data center.

[0003] The current computer room air conditioners have some challenges in regulating the computer room environment, such as frequent start and stop under low load, too low supply air temperature during dehumidification, and too fast temperature rise for heating alone. Frequent start and stop under low load will occur in the early stage of computer room construction, in winter when outdoor temperature is low, or at night when network demand is low. At this time, only some servers are running, and the cooling demand is much smaller than the minimum cooling capacity of the air conditioner, resulting in the computer room temperature dropping and the air conditioner shutting down. As the cabinet continues to dissipate heat and the air temperature in the computer room rises, the air conditioner will start again. This repeated start and stop process not only cannot meet the demand for precise control of the temperature in the cabinet, but also the frequent start and stop of the compressor is not conducive to the oil return of the compressor. For a long time, the compressor may be damaged due to lack of oil, and repeated start and stop will also increase power consumption. Low dehumidification supply air temperature will occur when the humidity in the computer room is high in spring and summer. The computer room air conditioner starts dehumidification to control the humidity range. If the load is very low at the same time, the supply air temperature may be too low, which is not conducive to the normal operation of the server and will cause the temperature of the computer room to fluctuate. The problem of temperature rise due to heating alone may occur in areas with very low outdoor temperatures, where the natural heat dissipation of the computer room is greater than the heat generated by the server, resulting in the temperature inside the computer room being too low. At this time, electric heating is turned on to make up for the heat gap. Once the electric heater is turned on, the temperature will rise rapidly. Too fast a change in the temperature of the computer room is not conducive to the stable operation of the server, and may trigger the air conditioner to turn on and increase power consumption. At present, some manufacturers will use multiple electric heaters to turn on separately to adjust the heating amount in steps. This method can alleviate the problem, but the temperature of the computer room will still be unstable. Summary of the invention

[0004] The present invention provides an air-conditioning indoor unit, an operation control method and device thereof, and an air-conditioning unit. The air-conditioning indoor unit can achieve stepless adjustment of heating capacity and full-load adjustment of cooling capacity through reasonable control logic, and reduce the challenges of frequent start and stop and low temperature dehumidification.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] An air conditioner indoor unit comprises a body, an air supply fan, an evaporator, a compressor, at least one electric heater, a solid-state relay and a controller; wherein:

[0007] The machine body comprises a return air port and an air supply port, the machine body has a ventilation duct connecting the return air port and the air supply port, the evaporator, at least one electric heater and an air supply fan are located on the ventilation duct, the solid-state relay is electrically connected to the at least one electric heater, the compressor is connected to the outlet of the evaporator, and the controller is signal-connected to the solid-state relay and the compressor;

[0008] The controller is used to:

[0009] Get the temperature and humidity of the computer room;

[0010] The working state of the compressor and the output voltage of the solid-state relay are controlled according to the temperature and humidity of the machine room.

[0011] In the air conditioner indoor unit provided by the embodiment of the present invention, the evaporator, at least one electric heater and the air supply fan are located on the ventilation duct, the solid-state relay is electrically connected to the at least one electric heater, the compressor is connected to the outlet of the evaporator, the controller is connected to the solid-state relay and the compressor signal, the controller is used to obtain the temperature and humidity of the machine room, and according to the temperature and humidity of the machine room, control the working state of the compressor and the output voltage of the solid-state relay, the controller can send a demand signal containing different heating requirements (for example, 0-10V) to the solid-state relay, the solid-state relay can change the output voltage according to the demand signal, the heating amount of the electric heater changes with the change of the working voltage, the demand signal in this process can change between 0-100%, corresponding to the heating amount of the electric heater changing between 0-100%, the air flow is cooled by the evaporator and heated by the electric heater, and finally sent out of the unit by the air supply fan. When the electric heater is running, the heating amount can change smoothly, so that the temperature of the machine room changes smoothly. The above-mentioned air-conditioning indoor unit can achieve stepless adjustment of heating capacity and full-load adjustment of cooling capacity through reasonable control logic, reduce the challenges of frequent start and stop and dehumidification and low temperature, which is conducive to the normal operation of the server in the computer room and reduces the misjudgment of the air conditioner in the computer room.

[0012] Optionally, when controlling the working state of the compressor and the output voltage of the solid-state relay according to the temperature and humidity of the machine room, the controller is specifically used to:

[0013] Calculating the cooling demand of the air conditioner according to the temperature of the computer room and a preset threshold temperature;

[0014] When the cooling demand of the air conditioner is greater than the first preset cooling demand, the compressor is controlled to start to start the air conditioning unit.

[0015] Optionally, when the cooling demand of the air conditioner is greater than the first preset cooling demand, after controlling the compressor to turn on, the controller is specifically used to:

[0016] When the cooling demand of the air conditioner is less than a second preset cooling demand, controlling the compressor to turn off;

[0017] Obtaining the return air temperature at the return air outlet;

[0018] When the return air temperature is lower than the first preset temperature and the temperature of the machine room is lower than the second preset temperature, the solid-state relay is controlled to be turned on, and the output voltage of the solid-state relay is controlled according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater;

[0019] When the return air temperature is greater than a third preset temperature or the temperature of the machine room is greater than a fourth preset temperature, controlling the solid-state relay to turn off so as to turn off the electric heater;

[0020] The second preset cooling demand is smaller than the first preset cooling demand, the third preset temperature is larger than the first preset temperature, and the fourth preset temperature is larger than the second preset temperature.

[0021] Optionally, when the cooling demand of the air conditioner is greater than a first preset cooling demand, when the compressor is controlled to start, the controller is specifically used to:

[0022] Acquire the return air temperature at the return air outlet and the supply air temperature at the supply air outlet;

[0023] When the humidity of the machine room is less than the first preset humidity, the return air temperature is less than the fifth preset temperature, the supply air temperature is less than the sixth preset temperature, and the cooling demand of the air conditioner is less than the third preset cooling demand, the solid-state relay is controlled to turn on, and the output voltage of the solid-state relay is adjusted according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater;

[0024] When the return air temperature is greater than the seventh preset temperature, or the supply air temperature is greater than the eighth preset temperature, or the cooling demand of the air conditioning unit is greater than the fourth preset cooling demand, controlling the solid-state relay to turn off to turn off the electric heater;

[0025] The seventh preset temperature is greater than the fifth preset temperature, the eighth preset temperature is greater than the sixth preset temperature, and the fourth preset cooling demand is greater than the third preset cooling demand and less than the first preset cooling demand.

[0026] Optionally, when the cooling demand of the air conditioner is greater than a first preset cooling demand, when the compressor is controlled to start, the controller is specifically used to:

[0027] When the humidity of the computer room is greater than the first preset humidity and the temperature of the computer room is less than the ninth preset temperature, the solid-state relay is controlled to turn on, and the output voltage of the solid-state relay is adjusted according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater;

[0028] When the humidity of the machine room is lower than the second preset humidity or the temperature of the machine room is higher than the tenth preset temperature, controlling the solid-state relay to turn off so as to turn off the electric heater;

[0029] Wherein, the tenth preset temperature is greater than the ninth preset temperature, and the second preset humidity is less than the first preset humidity.

[0030] Optionally, before controlling the compressor to start, the controller is further configured to:

[0031] Determine whether the air conditioner has a serious alarm;

[0032] If there is no serious alarm, the compressor is controlled to start.

[0033] Optionally, the solid-state relay comprises a single-phase relay, and an output end of the single-phase relay is electrically connected to an input end of the at least one electric heater;

[0034] The input end of the single-phase relay is electrically connected to a live wire, and the output end of each electric heater is electrically connected to a neutral wire, or the input end of the single-phase relay is electrically connected to a live wire, and the output end of each electric heater is electrically connected to another live wire.

[0035] Optionally, the solid-state relay comprises a three-phase relay, and each output terminal of the three-phase relay is electrically connected to an input terminal of at least one of the electric heaters;

[0036] Among them, the three input ends of the three-phase relay are electrically connected to three live wires respectively, and the output end of each electric heater is electrically connected to a neutral wire, or the input ends of the three-phase relay are electrically connected to three live wires respectively, and the output ends of all the electric heaters are electrically connected to three live wires respectively.

[0037] Optionally, the solid-state relay is mounted on a metal plate inside the body.

[0038] Optionally, a heat dissipation mechanism is provided on the solid-state relay.

[0039] Optionally, the evaporator, the electric heater and the air supply fan are arranged in sequence along the direction from the return air outlet to the air outlet on the ventilation duct, or the electric heater, the evaporator and the air supply fan are arranged in sequence.

[0040] The present invention also provides an air-conditioning unit, comprising any one of the air-conditioning indoor units provided in the above technical solutions.

[0041] The present invention further provides an operation control method of an air conditioner indoor unit, which is applied to any one of the air conditioner indoor units provided in the above technical solutions, and the operation control method comprises:

[0042] Get the temperature and humidity of the computer room;

[0043] The working state of the compressor and the output voltage of the solid-state relay are controlled according to the temperature and humidity of the machine room.

[0044] The present invention also provides an operation control device for an air conditioner indoor unit, comprising:

[0045] An acquisition unit, used for acquiring the temperature and humidity of the computer room;

[0046] A control unit is used to control the working state of the compressor and the output voltage of the solid-state relay according to the temperature and humidity of the machine room. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic diagram of the structure of an air-conditioning indoor unit provided by an embodiment of the present invention;

[0048] Figure 2 A schematic diagram of the structure of another air conditioner indoor unit provided by an embodiment of the present invention;

[0049] Figure 3 A control flow chart of a controller in an air conditioner indoor unit provided by an embodiment of the present invention;

[0050] Figure 4 A corresponding relationship diagram between a cooling demand and an electric heating calculation output provided by an embodiment of the present invention;

[0051] Figure 5 Another corresponding relationship diagram between cooling demand and electric heating calculation output provided by an embodiment of the present invention;

[0052] Figure 6 A corresponding relationship diagram between an electric heating calculation output and a control signal provided by an embodiment of the present invention;

[0053] Figure 7 Another corresponding relationship diagram between electric heating calculation output and control signal provided by an embodiment of the present invention;

[0054] Figure 8 A circuit connection diagram of a solid-state relay and an electric heater provided in an embodiment of the present invention;

[0055] Fig. 9 Another circuit connection diagram of a solid-state relay and an electric heater provided in an embodiment of the present invention;

[0056] Fig.10 Another circuit connection diagram of a solid-state relay and an electric heater provided in an embodiment of the present invention;

[0057] Fig.11 Another circuit connection diagram of a solid-state relay and an electric heater provided in an embodiment of the present invention;

[0058] Fig.12 A flow chart of an operation control method of an air conditioner indoor unit provided by an embodiment of the present invention;

[0059] Fig.13 A schematic structural diagram of an operation control device for an air-conditioning indoor unit provided by an embodiment of the present invention.

[0060] icon:

[0061] 1-machine body; 2-air supply fan; 3-evaporator; 4-electric heater; 5-solid-state relay; 6-controller. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] Please refer to Figure 1 and Figure 2 The present invention provides an air conditioner indoor unit, comprising a body 1, an air supply fan 2, an evaporator 3, a compressor, at least one electric heater 4, a solid-state relay 5 and a controller 6; wherein,

[0064] The machine body 1 includes a return air port and an air supply port, and the machine body 1 has a ventilation duct connecting the return air port and the air supply port ( Figure 1 and Figure 2 The direction of the arrow in the middle indicates the flow direction of the airflow in the ventilation duct), the evaporator 3, at least one electric heater 4 and the air supply fan 2 are located on the ventilation duct, the solid-state relay 5 is electrically connected to the at least one electric heater 4, the compressor is connected to the outlet of the evaporator 3, and the controller 6 is connected to the solid-state relay 5 and the compressor signal;

[0065] The controller 6 is used for:

[0066] Get the temperature and humidity of the computer room;

[0067] The working state of the compressor and the output voltage of the solid-state relay 5 are controlled according to the temperature and humidity of the machine room.

[0068] In the air conditioner indoor unit provided by the embodiment of the present invention, the evaporator 3, at least one electric heater 4 and the air supply fan 2 are located on the ventilation duct, the solid-state relay 5 is electrically connected to the at least one electric heater 4, the compressor is connected to the outlet of the evaporator 3, and the controller 6 is connected to the solid-state relay 5 and the compressor signal. The controller 6 is used to obtain the temperature and humidity of the machine room, and control the working state of the compressor and the output voltage of the solid-state relay 5 according to the temperature and humidity of the machine room. The controller 6 can send a demand signal containing different heating requirements (for example, 0-10V) to the solid-state relay 5. The solid-state relay 5 can change the output voltage according to the demand signal. The heating amount of the electric heater 4 changes with the change of the working voltage. The demand signal in this process can change between 0-100%, corresponding to the change of the heating amount of the electric heater between 0-100%. Figure 1 and Figure 2 The direction of the middle arrow indicates the flow direction of the airflow in the ventilation duct. The airflow is cooled by the evaporator 3 and heated by the electric heater, and finally sent out of the unit by the air supply fan 2. When the electric heater 4 is running, the heating amount can change smoothly, so that the temperature of the computer room changes smoothly. The above-mentioned air-conditioning indoor unit can achieve stepless adjustment of heating amount, full load adjustment of cooling amount, and reduce the challenges of frequent start and stop and dehumidification low temperature through reasonable control logic, which is conducive to the normal operation of the server in the computer room and reduces the misjudgment of the computer room air conditioner.

[0069] In the air conditioner indoor unit provided by the above-mentioned embodiment of the invention, the controller can also be connected to the air supply fan signal. When the air conditioner indoor unit is powered on, the controller can control the air supply fan to turn on immediately. After the compressor is turned on, the controller can adjust the cooling capacity of the air conditioner by controlling the speed of the compressor and the speed of the air supply fan.

[0070] In the air conditioner indoor unit provided by the above-mentioned embodiment of the invention, the specific control flow chart of the controller 6 can be as follows: Figure 3 As shown, the electric heater 4 in the air conditioner can be operated in the following three modes: single compensation, low-load compensation and dehumidification low-temperature compensation.

[0071] like Figure 3As shown, in a possible implementation, when controlling the working state of the compressor and the output voltage of the solid-state relay 5 according to the temperature of the computer room and the humidity of the computer room, the controller 6 can be specifically used to: calculate the cooling demand of the air conditioner according to the temperature of the computer room and the preset threshold temperature; when the cooling demand of the air conditioner is greater than the first preset cooling demand A, control the compressor to turn on to start the air-conditioning unit.

[0072] Specifically, the controller 6 can calculate the corresponding cooling demand (CFC) of the air conditioner through the PID algorithm according to the difference between the temperature of the machine room and the preset threshold temperature. When the cooling demand CFC of the air conditioner is greater than the first preset cooling demand A, the controller 6 can control the air conditioner to start, for example, control the compressor to start and other components in the air conditioning refrigeration system to start.

[0073] like Figure 3 In one possible implementation, after the compressor is controlled to turn on when the cooling demand of the air conditioner is greater than the first preset cooling demand A, the controller 6 is specifically used to control the compressor to turn off when the cooling demand of the air conditioner is less than the second preset cooling demand B; obtain the return air temperature Ta at the return air outlet; when the return air temperature Ta is less than the first preset temperature t1 and the temperature Tb of the computer room is less than the second preset temperature t2, control the solid-state relay 5 to turn on, and control the output voltage of the solid-state relay 5 according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater 4; when the return air temperature Ta is greater than the third preset temperature t3 or the temperature Tb of the computer room is greater than the fourth preset temperature t4, control the solid-state relay 5 to turn off to turn off the electric heater 4; wherein the second preset cooling demand B is less than the first preset cooling demand A, the third preset temperature t3 is greater than the first preset temperature t1, and the fourth preset temperature t4 is greater than the second preset temperature t2.

[0074] Specifically, after the air conditioner is started, the machine room is cooled down. When the controller 6 calculates that the cooling demand is less than the second preset cooling demand B, the controller 6 controls the compressor to turn off. When the state of the air conditioner is stable and the compressor is still in the off state, if the return air temperature Ta is less than the first preset temperature t1 and the temperature Tb of the machine room is less than the second preset temperature t2, the electric heater 4 is turned on by a separate heating method. At this time, the air supply fan 2 operates normally. The controller 6 controls the solid-state relay 5 to turn on and controls the output voltage of the solid-state relay according to the air conditioning cooling demand, and then adjusts the working voltage on the electric heater 4 to adjust the heating amount of the electric heater 4 so that the heating amount changes with the change of the cooling demand. The heating amount is accurately controlled to change the temperature in the machine room in real time, which helps the temperature of the machine room to rise quickly and can avoid equipment failure in the machine room caused by too low temperature in the machine room. After being heated by the electric heater 4, when the return air temperature Ta is greater than t3 or the temperature Tb of the machine room is greater than t4, the controller 6 can control the solid-state relay 5 to turn off, and then turn off the separate compensation electric heating function of the electric heater 4.

[0075] like Figure 3 As shown, in a possible implementation manner, when the cooling demand of the air conditioner is greater than the first preset cooling demand A, when the compressor is controlled to be turned on, the controller 6 is specifically used to: obtain the return air temperature Ta at the return air outlet and the supply air temperature Tc at the supply air outlet; when the humidity RHa of the machine room is less than the first preset humidity RH1, the return air temperature Ta is less than the fifth preset temperature t5, the supply air temperature Tc is less than the sixth preset temperature t6, and the cooling demand of the air conditioner is less than the third preset cooling demand C, control the solid-state relay 5 to be turned on, and adjust the output voltage of the solid-state relay 5 according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater 4; when the return air temperature Ta is greater than the seventh preset temperature t7, or the supply air temperature Tc is greater than the eighth preset temperature t8, or the cooling demand of the air-conditioning unit is greater than the fourth preset cooling demand D, control the solid-state relay 5 to be turned off to turn off the electric heater 4; wherein the seventh preset temperature t7 is greater than the fifth preset temperature t5, the eighth preset temperature t8 is greater than the sixth preset temperature t6, and the fourth preset cooling demand D is greater than the third preset cooling demand C and less than the first preset cooling demand A.

[0076] Specifically, when the controller 6 calculates that the cooling demand is greater than the first preset cooling demand A, the condition for the compressor to start is met, and the controller 6 will control the compressor to start, so that the air conditioning refrigeration system is turned on, and the temperature Tb of the machine room is adjusted and controlled. After the compressor is turned on, when the humidity RHa of the machine room is less than RH1, the air conditioning unit does not need to turn on the dehumidification function. In this case, when the return air temperature Ta is less than the fifth preset temperature t5, the supply air temperature Tc is less than the sixth preset temperature t6, and the air conditioning cooling demand is less than the third preset cooling demand C, the air conditioning system has a low-load compensation demand, then the controller 6 controls the solid-state relay 5 to turn on and adjusts the output voltage of the solid-state relay 5 according to the cooling demand of the machine room to adjust the heating amount of the electric heater 4, and the low-load compensation electric heating is turned on. At this time, the air supply fan 2 operates normally, the electric heater 4 is turned on, and the gas in the ventilation duct is heated by the electric heater 4 and then sent out of the air conditioning unit by the air supply fan 2, so that the air temperature in the machine room remains stable, and the compressor and the air supply fan 2 operate normally. This heating method can keep the supply air temperature changing slowly during the heating period, and the air temperature in the computer room fluctuates less, avoiding the compressor from frequently starting and stopping when the computer room is under low load, better protecting the compressor and the server. When the return air temperature Ta is greater than the seventh preset temperature t7 or the supply air temperature is greater than the eighth preset temperature t8 or the cooling demand of the air conditioner is greater than the fourth preset cooling demand D, the controller 6 can control the solid-state relay 5 to turn off, thereby turning off the low-load compensation electric heating function of the electric heater 4.

[0077] like Figure 3 As shown, in one possible implementation, when the cooling demand of the air conditioner is greater than the first preset cooling demand A, when the compressor is controlled to turn on, the controller 6 is specifically used to: when the humidity RHa of the machine room is greater than the first preset humidity RH1 and the temperature Tb of the machine room is less than the ninth preset temperature t9, control the solid-state relay 5 to turn on, and adjust the output voltage of the solid-state relay 5 according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater 4; when the humidity RHa of the machine room is less than the second preset humidity RH2 or the temperature Tb of the machine room is greater than the tenth preset temperature t10, control the solid-state relay 5 to turn off to turn off the electric heater 4; wherein, the tenth preset temperature t10 is greater than the ninth preset temperature t9, and the second preset humidity RH2 is less than the first preset humidity RH1.

[0078] Specifically, when the controller 6 calculates that the cooling demand is greater than the first preset cooling demand A, the condition for the compressor to start is met, and the controller 6 will control the compressor to start, so that the air conditioning refrigeration system is turned on to adjust and control the temperature of the machine room. After the compressor is turned on, when the humidity RHa in the machine room is greater than the first preset humidity RH1, the air conditioning unit needs to turn on the dehumidification function. In this case, when the unit enters the dehumidification mode, the air conditioning refrigeration system will be adjusted to reduce the evaporation temperature of the air, which can easily cause the actual temperature of the machine room to be too low. In order to avoid the phenomenon of too low temperature in the machine room while ensuring that the system has the function of meeting the dehumidification demand, the dehumidification low temperature compensation function can be achieved by heating the electric heater 4. For example, when the humidity RHa of the machine room is greater than the first preset humidity RH1 and the temperature Tb of the machine room is less than the ninth preset temperature t9, the controller 6 controls the relay to turn on and adjusts the output voltage of the solid-state relay 5 according to the cooling demand of the machine room to adjust the heating amount of the electric heater 4, and turns on the electric heater 4 in the form of dehumidification and low-temperature compensation. The electric heater 4 cooperates with the dynamic adjustment of the dehumidification compensation operation to ensure that the temperature and humidity of the machine room are within a reliable range, avoid the compressor shutting down due to the low temperature of the machine room, and maintain dynamic balance. When the humidity of the machine room is less than the second preset humidity or the temperature of the machine room is greater than the tenth preset temperature, the controller 6 can control the solid-state relay 5 to turn off, thereby turning off the dehumidification and low-temperature compensation electric heating function of the electric heater.

[0079] like Figure 3 As shown, in a possible implementation, before controlling the compressor to start, the controller 6 is also used to: determine whether the air conditioner has a serious alarm; if there is no serious alarm, control the compressor to start, so as to ensure the normal operation of the air conditioning system; if there is a serious alarm, the compressor cannot be controlled to start, so as to avoid causing greater damage to the air conditioning unit, and re-acquire the information on whether the system has a serious alarm, until the controller obtains a signal that the system has no serious alarm, and then controls the compressor to start. Among them, the faults of the air conditioning system can be graded according to the degree of the fault of the air conditioning unit, and faults of different levels can be judged by different alarm signals. For example, the fault level alarm of the air conditioning unit can be divided into low-level alarm, medium-level alarm, high-level alarm and serious alarm from low to high. Here, there is no specific restriction on the alarm level corresponding to which air conditioning faults correspond, and the classification can be selected according to the actual situation.

[0080] The superposition of the three operating modes of the electric heater 4 can not only ensure the full range of temperature and humidity adjustment of the computer room air conditioner, but also avoid the frequent start and stop of the air conditioner compressor equipment, thereby extending the service life. Specifically, the electric heater changes the heating amount as the circuit voltage changes, and the control signal can change steplessly between 0-100%, and the heating amount can change steplessly between 0-100%. The heating amount is accurately controlled, so that the room temperature changes smoothly when the heating is turned on, which is conducive to the normal operation of the server and reduces the misjudgment of the computer room air conditioner; and, due to the limitation of the minimum speed of the compressor, the cooling capacity has a minimum value. When the computer room load is lower than the minimum cooling capacity of the air conditioner, the heater is turned on to control the heating amount in real time to supplement the difference between the load and the minimum cooling capacity, and finally the equivalent cooling capacity can be continuously operated within the full cooling range of 0-100%.

[0081] Specifically, in the specific process that the controller 6 controls the relay to turn on and adjusts the output voltage of the solid-state relay 5 according to the cooling demand of the machine room, after the electric heater 4 is turned on, the controller 6 can calculate the cooling demand CFC of the air conditioner according to the algorithm, wherein the calculation method of the cooling demand CFC can be a PID algorithm, or can also be a PI adjustment or a P adjustment, etc. The controller 6 sends a DC voltage control signal in the range of 0-10V to the solid-state relay 5, so that the electric heater 4 can reach a heating amount in the range of 0-100%. Figure 4 As shown, when the cooling demand of the air conditioner is n2, the electric heater 4 is turned on, and the electric heating calculation output is m1; when the cooling demand of the air conditioner is n1, the maximum electric heating calculation output is m2; when the cooling demand of the air conditioner is between n1 and n2, the electric heating calculation output is Figure 4 Linear correspondence; when the cooling demand of the air conditioner is between n2 and n3, the heating demand is small, and the electric heating calculation output maintains m1 until the cooling demand reaches n3, when the electric heating calculation output is 0. Figure 5 As shown, the calculation relationship between the electric heating calculation output and the cooling demand can also be calculated using a step-by-step method or other methods, which are not limited here.

[0082] The number of the electric heater 4 can be one or more, and can be selected according to the maximum heating demand and the space limitation of the air conditioner indoor unit. The electric heater 4 can be in various forms, such as a PTC electric heater 4 or an electric heating tube with constant resistance, which is not limited here.

[0083] Due to the voltage regulation characteristics of the solid-state relay 5 and the power characteristics of the PCT electric heater 4, the applied control signal and the output power are not linearly related, and the power signal fluctuates greatly in the middle section. Therefore, the corresponding relationship between the electric heating calculation output and the control signal issued by the controller 6 is as follows: Figure 6As shown, when the control signal is between Y1 and Y2 in the middle section, the corresponding straight line slope is the smallest, and the adjustable power range is relatively large. During the entire adjustment process, the ambient temperature will change in real time, so the cooling demand is also changing in real time. The controller 6 sends different control signals to provide corresponding power output to achieve a dynamic balance of the heating temperature near the set temperature, realizing stepless adjustment, and the temperature of the computer room changes smoothly during the entire adjustment process.

[0084] When the electric heater 4 is an electric heating tube with constant resistance, the control signal and the motor heat calculation output are linearly related, such as Figure 7 shown.

[0085] It should be noted that the specific values ​​of the first preset temperature t1 to the tenth preset temperature t10, the first preset humidity RH1, the second preset humidity RH2 and the first preset cooling demand A to the fourth preset cooling demand D can be determined according to actual needs and are not limited here.

[0086] The above-mentioned return air temperature, supply air temperature, and temperature of the machine room can be obtained through temperature sensors. For example, the return air temperature is collected by a first temperature sensor arranged at the return air outlet, the supply air temperature is collected by a second temperature sensor arranged at the supply air outlet, and the temperature of the machine room is collected by a third temperature sensor arranged in the machine room. Specifically, the first temperature sensor and the second temperature sensor can be temperature sensors provided by the air conditioner indoor unit itself, or can be temperature sensors independently provided by the air conditioner indoor unit; the temperature of the machine room collected by the third temperature sensor can be the temperature of the air near the return air outlet in the machine room, the temperature of the air near the air outlet in the machine room, or the temperature of the air at a certain place in the machine room far away from the air conditioner indoor unit. The controller 6 obtains the supply air temperature, the return air temperature, and the temperature of the machine room by connecting the signals of the first sensor, the second sensor, and the third sensor.

[0087] The humidity of the above-mentioned machine room can be collected by a humidity sensor, and the humidity of the machine room can be the humidity of the air near the return air outlet in the machine room, the humidity of the air near the air supply outlet in the machine room, or the humidity of the air at a certain place in the machine room far away from the indoor unit of the air conditioner. The controller 6 obtains the humidity of the machine room by connecting with the humidity sensor signal.

[0088] Specifically, the controller 6 may be a main control board in an indoor unit of an air conditioner.

[0089] In the air conditioner indoor unit provided by the embodiment of the present invention, Figure 8 and Fig. 9 As shown, the solid-state relay 5 may be a single-phase relay, and an output end of the single-phase relay is electrically connected to an input end of at least one electric heater 4;

[0090] Specifically, Figure 8 As shown, the input end of the single-phase relay is electrically connected to a live wire L, and the output end of each electric heater 4 is electrically connected to a neutral wire N; or Fig. 9 As shown, the input end of the single-phase relay is electrically connected to a live wire L1, and the output end of each electric heater 4 is electrically connected to another live wire L2.

[0091] In the air conditioner indoor unit provided by the embodiment of the present invention, Fig.10 and Fig.11 As shown, the solid-state relay 5 may also be a three-phase relay, and each output end of the three-phase relay is electrically connected to the input end of at least one electric heater 4;

[0092] Specifically, Fig.10 As shown, the three input terminals of the three-phase relay are electrically connected to the three live wires L1, L2 and L3 respectively, and the output terminal of each electric heater 4 is electrically connected to a neutral wire N; or Fig.11 As shown, the input ends of the three-phase relay are electrically connected to the three live wires L1 , L2 and L3 , respectively, and the output ends of all the electric heaters 4 are electrically connected to the three live wires L1 , L2 and L3 , respectively.

[0093] In the above-mentioned air-conditioning indoor unit, the specific type of solid-state relay 5 can be selected and used according to the number of electric heaters 4 and the installation space, and is not limited here.

[0094] Specifically, the solid-state relay 5 can change the voltage in various ways, such as phase angle control, that is, changing the conduction area of ​​each sine wave; half-wave control, that is, changing the number of complete sine waves conducted per second; or chopping control, that is, changing the number of on-off times of the solid-state relay 5 per second. The controller 6 can send a variety of signals to the solid-state relay 5, such as 4-32V, 4-20mA, etc., which are not limited here and are determined according to actual conditions.

[0095] In the air conditioner indoor unit provided by the embodiment of the present invention, the solid-state relay 5 can be installed on the metal plate inside the body 1, which can save space and utilize the convection of air flow and the heat conduction of the metal plate to dissipate heat.

[0096] Specifically, a heat dissipation mechanism may also be provided on the solid-state relay 5. For example, the heat dissipation mechanism may be a heat dissipation fin added to the rear of the solid-state relay 5, or a heat dissipation fin added to the side of the solid-state relay 5, which can dissipate heat for the solid-state relay 5 when the load is large or the heat dissipation is poor.

[0097] In the indoor unit of the air conditioner provided by the embodiment of the present invention, in the ventilation duct, the direction from the return air outlet to the air outlet is as follows: Figure 1As shown, the evaporator 3, the electric heater 4 and the air supply fan 2 are arranged in sequence, that is, the electric heater 4 is installed on the air outlet side of the air conditioner indoor unit, located between the evaporator 3 and the air supply fan 2; or, Figure 2 As shown, the electric heater 4 , the evaporator 3 and the air supply fan 2 are arranged in sequence, that is, the electric heater 4 is installed on the air inlet side of the air conditioner indoor unit, and is located between the return air outlet and the evaporator 3 .

[0098] Based on the same inventive concept, an embodiment of the present invention further provides an air conditioning unit, including any one of the air conditioning indoor units provided in the above technical solutions. Specifically, the air conditioning unit may include an indoor unit and an outdoor unit, the outdoor unit may include a condenser, a fan corresponding to the condenser, and a throttle valve, etc., the evaporator, the compressor, the condenser, and the throttle valve are connected in a loop in sequence to form a refrigeration system of the air conditioning unit, and the refrigeration capacity can be adjusted by controlling the fan corresponding to the condenser, the compressor, and the air supply fan.

[0099] Based on the same inventive concept, an embodiment of the present invention further provides an operation control method of an air conditioner indoor unit, which is applied to any one of the air conditioner indoor units provided in the above technical solutions. The operation control method, as shown in FIG12 , includes:

[0100] S1201: Acquire the temperature and humidity of the computer room;

[0101] S1201: Control the working state of the compressor and the output voltage of the solid-state relay according to the temperature and humidity of the machine room.

[0102] In the operation control method of the air-conditioning indoor unit provided in the embodiment of the present invention, the temperature and humidity of the machine room are first obtained, and then the working state of the compressor and the output voltage of the solid-state relay are controlled according to the temperature and humidity of the machine room. Through reasonable control logic, the heating amount can be adjusted steplessly, the cooling amount can be adjusted at full load, and the challenges of frequent start and stop and dehumidification and low temperature can be reduced.

[0103] Optionally, controlling the working state of the compressor and the output voltage of the solid-state relay according to the temperature and humidity of the machine room includes:

[0104] Calculating the cooling demand of the air conditioner according to the temperature of the computer room and a preset threshold temperature;

[0105] When the cooling demand of the air conditioner is greater than the first preset cooling demand, the compressor is controlled to start to start the air conditioning unit.

[0106] Optionally, when the cooling demand of the air conditioner is greater than a first preset cooling demand, after controlling the compressor to turn on, the method further comprises:

[0107] When the cooling demand of the air conditioner is less than a second preset cooling demand, controlling the compressor to turn off;

[0108] Obtaining the return air temperature at the return air outlet;

[0109] When the return air temperature is lower than the first preset temperature and the temperature of the machine room is lower than the second preset temperature, the solid-state relay is controlled to be turned on, and the output voltage of the solid-state relay is controlled according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater;

[0110] When the return air temperature is greater than a third preset temperature or the temperature of the machine room is greater than a fourth preset temperature, controlling the solid-state relay to turn off so as to turn off the electric heater;

[0111] The second preset cooling demand is smaller than the first preset cooling demand, the third preset temperature is larger than the first preset temperature, and the fourth preset temperature is larger than the second preset temperature.

[0112] Optionally, when the cooling demand of the air conditioner is greater than a first preset cooling demand, controlling the compressor to turn on includes:

[0113] Acquire the return air temperature at the return air outlet and the supply air temperature at the supply air outlet;

[0114] When the humidity of the machine room is less than the first preset humidity, the return air temperature is less than the fifth preset temperature, the supply air temperature is less than the sixth preset temperature, and the cooling demand of the air conditioner is less than the third preset cooling demand, the solid-state relay is controlled to turn on, and the output voltage of the solid-state relay is adjusted according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater;

[0115] When the return air temperature is greater than the seventh preset temperature, or the supply air temperature is greater than the eighth preset temperature, or the cooling demand of the air conditioning unit is greater than the fourth preset cooling demand, controlling the solid-state relay to turn off to turn off the electric heater;

[0116] The seventh preset temperature is greater than the fifth preset temperature, the eighth preset temperature is greater than the sixth preset temperature, and the fourth preset cooling demand is greater than the third preset cooling demand and less than the first preset cooling demand.

[0117] Optionally, when the cooling demand of the air conditioner is greater than a first preset cooling demand, controlling the compressor to turn on includes:

[0118] When the humidity of the machine room is greater than the first preset humidity and the temperature of the machine room is less than the ninth preset temperature, the solid-state relay is controlled to turn on, and the output voltage of the solid-state relay is adjusted according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater;

[0119] When the humidity of the machine room is lower than the second preset humidity or the temperature of the machine room is higher than the tenth preset temperature, controlling the solid-state relay to turn off so as to turn off the electric heater;

[0120] Wherein, the tenth preset temperature is greater than the ninth preset temperature, and the second preset humidity is less than the first preset humidity.

[0121] Optionally, before the controlling the compressor to start, the method includes:

[0122] Determine whether the air conditioner has a serious alarm;

[0123] If there is no serious alarm, the compressor is controlled to start.

[0124] Based on the same inventive concept, the embodiment of the present invention also provides an operation control device for an air conditioner indoor unit, such as Fig.13 As shown, including:

[0125] An acquisition unit 100 is used to acquire the temperature and humidity of the computer room;

[0126] The control unit 200 is used to control the working state of the compressor and the output voltage of the solid-state relay according to the temperature and humidity of the machine room.

[0127] In the operation control device of the air-conditioning indoor unit provided in the embodiment of the present invention, the acquisition unit 100 is used to obtain the temperature and humidity of the machine room, and the control unit 200 is used to control the working state of the compressor and the output voltage of the solid-state relay according to the temperature and humidity of the machine room. Through reasonable control logic, the heating amount can be adjusted steplessly, the cooling amount can be adjusted at full load, and the challenges of frequent start and stop and dehumidification and low temperature can be reduced.

[0128] Optionally, the operating state of the compressor and the output voltage of the solid-state relay are controlled according to the temperature and humidity of the machine room, and the control unit 200 is specifically used to:

[0129] Calculating the cooling demand of the air conditioner according to the temperature of the computer room and a preset threshold temperature;

[0130] When the cooling demand of the air conditioner is greater than the first preset cooling demand, the compressor is controlled to start to start the air conditioning unit.

[0131] Optionally, when the cooling demand of the air conditioner is greater than a first preset cooling demand, after the compressor is controlled to turn on,

[0132] The control unit 200 is specifically used for:

[0133] When the cooling demand of the air conditioner is less than a second preset cooling demand, controlling the compressor to turn off;

[0134] The acquisition unit 100 is also used to acquire the return air temperature at the return air outlet;

[0135] The control unit 200 is also specifically used for:

[0136] When the return air temperature is lower than the first preset temperature and the temperature of the machine room is lower than the second preset temperature, the solid-state relay is controlled to be turned on, and the output voltage of the solid-state relay is controlled according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater;

[0137] When the return air temperature is greater than a third preset temperature or the temperature of the machine room is greater than a fourth preset temperature, controlling the solid-state relay to turn off so as to turn off the electric heater;

[0138] The second preset cooling demand is smaller than the first preset cooling demand, the third preset temperature is larger than the first preset temperature, and the fourth preset temperature is larger than the second preset temperature.

[0139] Optionally, when the cooling demand of the air conditioner is greater than a first preset cooling demand, the compressor is controlled to start,

[0140] An acquisition unit 100 is used to acquire the return air temperature at the return air outlet and the supply air temperature at the supply air outlet;

[0141] The control unit 200 is specifically used for:

[0142] When the humidity of the machine room is less than the first preset humidity, the return air temperature is less than the fifth preset temperature, the supply air temperature is less than the sixth preset temperature, and the cooling demand of the air conditioner is less than the third preset cooling demand, the solid-state relay is controlled to turn on, and the output voltage of the solid-state relay is adjusted according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater;

[0143] When the return air temperature is greater than the seventh preset temperature, or the supply air temperature is greater than the eighth preset temperature, or the cooling demand of the air conditioning unit is greater than the fourth preset cooling demand, controlling the solid-state relay to turn off to turn off the electric heater;

[0144] The seventh preset temperature is greater than the fifth preset temperature, the eighth preset temperature is greater than the sixth preset temperature, and the fourth preset cooling demand is greater than the third preset cooling demand and less than the first preset cooling demand.

[0145] Optionally, when the cooling demand of the air conditioner is greater than the first preset cooling demand, when the compressor is controlled to turn on, the control unit 200 is specifically used to:

[0146] When the humidity of the machine room is greater than the first preset humidity and the temperature of the machine room is less than the ninth preset temperature, the solid-state relay is controlled to turn on, and the output voltage of the solid-state relay is adjusted according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater;

[0147] When the humidity of the machine room is lower than the second preset humidity or the temperature of the machine room is higher than the tenth preset temperature, controlling the solid-state relay to turn off so as to turn off the electric heater;

[0148] Wherein, the tenth preset temperature is greater than the ninth preset temperature, and the second preset humidity is less than the first preset humidity.

[0149] Optionally, before controlling the compressor to start, the control unit 200 is further configured to:

[0150] Determine whether the air conditioner has a serious alarm;

[0151] If there is no serious alarm, the compressor is controlled to start.

[0152] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An air conditioner indoor unit, characterized in that: It includes a machine body, an air supply fan, an evaporator, a compressor, at least one electric heater, a solid-state relay and a controller; wherein, The machine body comprises a return air port and an air supply port, the machine body has a ventilation duct connecting the return air port and the air supply port, the evaporator, at least one electric heater and an air supply fan are located on the ventilation duct, the solid-state relay is electrically connected to the at least one electric heater, the compressor is connected to the outlet of the evaporator, and the controller is signal-connected to the solid-state relay and the compressor; The controller is used to: Get the temperature and humidity of the computer room; Controlling the working state of the compressor and the output voltage of the solid-state relay according to the temperature and humidity of the machine room; When controlling the working state of the compressor and the output voltage of the solid-state relay according to the temperature and humidity of the machine room, the controller is specifically used for: Calculating the cooling demand of the air conditioner according to the temperature of the computer room and a preset threshold temperature; When the cooling demand of the air conditioner is greater than the first preset cooling demand, controlling the compressor to start, so as to start the air conditioning unit; When the cooling demand of the air conditioner is greater than the first preset cooling demand, when the compressor is controlled to start, the controller is specifically used to: Acquire the return air temperature at the return air outlet and the supply air temperature at the supply air outlet; When the humidity of the machine room is less than the first preset humidity, the return air temperature is less than the fifth preset temperature, the supply air temperature is less than the sixth preset temperature, and the cooling demand of the air conditioner is less than the third preset cooling demand, the solid-state relay is controlled to turn on, and the output voltage of the solid-state relay is adjusted according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater; When the return air temperature is greater than the seventh preset temperature, or the supply air temperature is greater than the eighth preset temperature, or the cooling demand of the air conditioning unit is greater than the fourth preset cooling demand, controlling the solid-state relay to turn off to turn off the electric heater; The seventh preset temperature is greater than the fifth preset temperature, the eighth preset temperature is greater than the sixth preset temperature, and the fourth preset cooling demand is greater than the third preset cooling demand and less than the first preset cooling demand.

2. The air conditioner indoor unit according to claim 1, characterized in that: When the cooling demand of the air conditioner is greater than the first preset cooling demand, after the compressor is controlled to start, the controller is specifically used to: When the cooling demand of the air conditioner is less than a second preset cooling demand, controlling the compressor to turn off; Obtaining the return air temperature at the return air outlet; When the return air temperature is lower than the first preset temperature and the temperature of the machine room is lower than the second preset temperature, the solid-state relay is controlled to be turned on, and the output voltage of the solid-state relay is controlled according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater; When the return air temperature is greater than a third preset temperature or the temperature of the machine room is greater than a fourth preset temperature, controlling the solid-state relay to turn off so as to turn off the electric heater; The second preset cooling demand is smaller than the first preset cooling demand, the third preset temperature is larger than the first preset temperature, and the fourth preset temperature is larger than the second preset temperature.

3. The air conditioner indoor unit according to claim 1, characterized in that: When the cooling demand of the air conditioner is greater than the first preset cooling demand, when the compressor is controlled to start, the controller is specifically used to: When the humidity of the computer room is greater than the first preset humidity and the temperature of the computer room is less than the ninth preset temperature, the solid-state relay is controlled to turn on, and the output voltage of the solid-state relay is adjusted according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater; When the humidity of the machine room is lower than the second preset humidity or the temperature of the machine room is higher than the tenth preset temperature, controlling the solid-state relay to turn off so as to turn off the electric heater; Wherein, the tenth preset temperature is greater than the ninth preset temperature, and the second preset humidity is less than the first preset humidity.

4. The air conditioner indoor unit according to claim 1, characterized in that: Before controlling the compressor to start, the controller is further configured to: Determine whether the air conditioner has a serious alarm; If there is no serious alarm, the compressor is controlled to start.

5. The air conditioner indoor unit according to claim 1, characterized in that: The solid-state relay comprises a single-phase relay, an output end of the single-phase relay being electrically connected to an input end of the at least one electric heater; The input end of the single-phase relay is electrically connected to a live wire, and the output end of each electric heater is electrically connected to a neutral wire, or the input end of the single-phase relay is electrically connected to a live wire, and the output end of each electric heater is electrically connected to another live wire.

6. The air conditioner indoor unit according to claim 1, characterized in that: The solid-state relay comprises a three-phase relay, each output end of the three-phase relay is electrically connected to an input end of at least one of the electric heaters; Among them, the three input ends of the three-phase relay are electrically connected to three live wires respectively, and the output end of each electric heater is electrically connected to a neutral wire, or the input ends of the three-phase relay are electrically connected to three live wires respectively, and the output ends of all the electric heaters are electrically connected to three live wires respectively.

7. The air conditioner indoor unit according to claim 1, characterized in that: The solid-state relay is mounted on a metal plate inside the body.

8. The air conditioner indoor unit according to claim 7, characterized in that: The solid-state relay is provided with a heat dissipation mechanism.

9. The air conditioner indoor unit according to claim 1, characterized in that: The evaporator, the electric heater and the air supply fan are arranged in sequence along the direction from the return air outlet to the air outlet on the ventilation duct, or the electric heater, the evaporator and the air supply fan are arranged in sequence.

10. An air conditioning unit, characterized in that: It comprises an air-conditioning indoor unit as described in any one of claims 1 to 9.

11. An operation control method for an air conditioner indoor unit, characterized in that: Applied to the air conditioner indoor unit according to any one of claims 1 to 9, the operation control method comprises: Get the temperature and humidity of the computer room; Controlling the working state of the compressor and the output voltage of the solid-state relay according to the temperature and humidity of the machine room; The controlling the working state of the compressor and the output voltage of the solid-state relay according to the temperature and humidity of the machine room comprises: Calculating the cooling demand of the air conditioner according to the temperature of the computer room and a preset threshold temperature; When the cooling demand of the air conditioner is greater than the first preset cooling demand, controlling the compressor to start, so as to start the air conditioning unit; When the cooling demand of the air conditioner is greater than the first preset cooling demand, controlling the compressor to start includes: Acquire the return air temperature at the return air outlet and the supply air temperature at the supply air outlet; When the humidity of the machine room is less than the first preset humidity, the return air temperature is less than the fifth preset temperature, the supply air temperature is less than the sixth preset temperature, and the cooling demand of the air conditioner is less than the third preset cooling demand, the solid-state relay is controlled to turn on, and the output voltage of the solid-state relay is adjusted according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater; When the return air temperature is greater than the seventh preset temperature, or the supply air temperature is greater than the eighth preset temperature, or the cooling demand of the air conditioning unit is greater than the fourth preset cooling demand, controlling the solid-state relay to turn off to turn off the electric heater; The seventh preset temperature is greater than the fifth preset temperature, the eighth preset temperature is greater than the sixth preset temperature, and the fourth preset cooling demand is greater than the third preset cooling demand and less than the first preset cooling demand.

12. The operation control method according to claim 11, characterized in that: When the cooling demand of the air conditioner is greater than the first preset cooling demand, after the compressor is controlled to start, the method includes: When the cooling demand of the air conditioner is less than a second preset cooling demand, controlling the compressor to turn off; Obtaining the return air temperature at the return air outlet; When the return air temperature is lower than the first preset temperature and the temperature of the machine room is lower than the second preset temperature, the solid-state relay is controlled to be turned on, and the output voltage of the solid-state relay is controlled according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater; When the return air temperature is greater than a third preset temperature or the temperature of the machine room is greater than a fourth preset temperature, controlling the solid-state relay to turn off so as to turn off the electric heater; The second preset cooling demand is smaller than the first preset cooling demand, the third preset temperature is larger than the first preset temperature, and the fourth preset temperature is larger than the second preset temperature.

13. The operation control method according to claim 11, characterized in that: When the cooling demand of the air conditioner is greater than the first preset cooling demand, controlling the compressor to start includes: When the humidity of the computer room is greater than the first preset humidity and the temperature of the computer room is less than the ninth preset temperature, the solid-state relay is controlled to turn on, and the output voltage of the solid-state relay is adjusted according to the cooling demand of the air conditioner to adjust the heating amount of the electric heater; When the humidity of the machine room is lower than the second preset humidity or the temperature of the machine room is higher than the tenth preset temperature, controlling the solid-state relay to turn off so as to turn off the electric heater; Wherein, the tenth preset temperature is greater than the ninth preset temperature, and the second preset humidity is less than the first preset humidity.

14. The operation control method according to claim 13, characterized in that: Before the compressor is turned on, the control includes: Determine whether the air conditioner has a serious alarm; If there is no serious alarm, the compressor is controlled to start.

15. An operation control device for an air-conditioning indoor unit, applied to the air-conditioning indoor unit according to any one of claims 1 to 9, characterized in that: include: An acquisition unit acquires the temperature and humidity of the computer room; The control unit controls the working state of the compressor and the output voltage of the solid-state relay according to the temperature and humidity of the machine room.

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