CN108679719A

CN108679719A - The control system and control method of the air conditioner indoor unit of small temperature difference air-supply

Info

Publication number: CN108679719A
Application number: CN201810558095.7A
Authority: CN
Inventors: 周鹏飞
Original assignee: Beijing Jing Hai Technology Co Ltd
Current assignee: Beijing Jing Hai Technology Co Ltd
Priority date: 2018-06-01
Filing date: 2018-06-01
Publication date: 2018-10-19
Anticipated expiration: 2038-06-01
Also published as: CN108679719B

Abstract

The application provides a kind of control system and control method of the air conditioner indoor unit of small temperature difference air-supply, and control system includes air conditioner indoor unit, microcontroller and the first Temperature Humidity Sensor and the second Temperature Humidity Sensor being connect with microcontroller of small temperature difference air-supply；Air conditioner indoor unit includes shell, and the lower part of shell is provided with main return air inlet, and the top of shell is provided with air outlet, and the aperture of air outlet is adjustable；The inside of shell is disposed with main air blower, humidifying unit and evaporator from bottom to top；The inside of shell is additionally provided with return air fan；The wind of main air blower blowout passes through evaporator heat exchange, and return air fan goes out the wind blown without evaporator heat exchange；Microcontroller control main air blower and return air fan are sent into indoor by air outlet after being mixed the wind of blowout.The application can improve wind pushing temperature in the case where refrigerating capacity is constant, reduce supply air temperature difference, keep the wind that air conditioner indoor unit is blown out softer.

Description

The control system and control method of the air conditioner indoor unit of small temperature difference air-supply

Technical field

The application belongs to air conditioner controlling technology field, and in particular to a kind of control system of the air conditioner indoor unit of small temperature difference air-supply System and control method.

Background technology

Under normal circumstances, the comfort temperature of people is at 26 DEG C or so, and relative humidity is 60% or so.To obtain this indoors The humiture environment of sample needs air first passing through surface cooler processing to a lower temperature and humidity value, is then re-fed into room, Treated air along heat moisture ratio line absorption room waste heat more than it is wet, be finally reached temperature set by people, humidity value.So And conventional domestic air-conditioning is using simplest dew-point air supply pattern, but because there is the requirement of humidity regulation, wind pushing temperature must It must be at 15 DEG C hereinafter, controlling room by controlling start and stop or the opening angle of frequency conversion and electric expansion valve of compressor Temperature.Wind pushing temperature of traditional domestic air conditioning under summer condition is low, and the difference of the comfort temperature of wind pushing temperature and people is sent Wind-warm syndrome difference is big, and for supply air temperature difference often at 11 DEG C or more, the wind sent out under this big supply air temperature difference pattern can allow people to feel to human body Must be very uncomfortable, it is especially more obvious to the user that some constitutions are weaker.

Invention content

To overcome the problems, such as at least to a certain extent present in the relevant technologies, this application provides a kind of small temperature difference to blow Air conditioner indoor unit control system and control method, the application can be controlled in the case where refrigerating capacity is constant improve air conditioning chamber Interior machine wind pushing temperature reduces supply air temperature difference, keeps the wind that air conditioner indoor unit is blown out softer.

According to the embodiment of the present application in a first aspect, this application provides a kind of controls of the air conditioner indoor unit of small temperature difference air-supply System processed comprising air conditioner indoor unit, microcontroller, the first Temperature Humidity Sensor and the second temperature and humidity sensing of small temperature difference air-supply Device；

The air conditioner indoor unit of the small temperature difference air-supply includes shell, and the lower part of shell is provided with main return air inlet, shell it is upper Portion is provided with air outlet, and the aperture of air outlet is adjustable；The inside of shell is disposed with main air blower, humidification from bottom to top Unit and evaporator；The inside of shell is additionally provided with return air fan；The wind of main air blower blowout passes through evaporator heat exchange, return air fan Go out the wind blown to carry out before sending to air outlet without evaporator heat exchange, the wind of main air blower blowout and the wind of return air fan blowout Mixing, mixed wind are got in by air outlet；

The main air blower, return air fan, the first Temperature Humidity Sensor and the second Temperature Humidity Sensor with the microcontroller Device connects, and first Temperature Humidity Sensor is used to acquire the humiture of the air after evaporator heat exchange, second humiture Sensor is used to acquire the humiture of the room air without evaporator heat exchange.

Further, the microcontroller includes main air blower gear determining module, highest wind pushing temperature determining module, reality Wind pushing temperature determining module and air supply outlet opening adjustment module；

The main air blower gear determining module is used for the difference according to collected indoor temperature and preset indoor temperature value The gear of the required corresponding main air blower of air quantity when value determination is initially powered up, according to the variation of indoor temperature in preset period of time Amount determines that main air blower upshifts or downshifts in current gear；The highest wind pushing temperature determining module is used for according to collected process The temperature and humidity value of sent air after evaporator heat exchange processing, at air conditioner indoor unit return air inlet without evaporator heat exchange processing The temperature and humidity value of room air and the maximum air supply rate of return air fan determine air conditioning chamber when main air blower is run under current gear The highest wind pushing temperature of interior machine；The practical wind pushing temperature determining module is used for according to the wind pushing temperature and main air blower manually set The comparison result of the highest wind pushing temperature of air conditioner indoor unit determines practical wind pushing temperature when being run under current gear；The air-supply Mouth aperture regulation module is used to adjust the aperture of air outlet according to the sum of air output of main air blower and return air fan so that air outlet Wind speed and air supplying distance in the range of setting.

Further, the temperature and humidity value of the air sent after evaporator heat exchange is handled is as first state point The temperature value of temperature and humidity value, the first state point is T1, humidity value RH1；At the return air inlet of the return air fan without Temperature and humidity value of the temperature and humidity value of the room air of pervaporation device heat exchange processing as the second state point, second state point Temperature value is T2, humidity value RH2；The main air blower highest wind pushing temperature determining module specific quilt when being run under current gear It is configured to：

According to the temperature T1 of first state point, humidity RH1, the enthalpy h1 of first state point is obtained by psychrometric chart；According to The temperature T2 of second state point, humidity RH2 obtain the enthalpy h2 of the second state point by psychrometric chart；

According to the air output G1 and return air fan of the enthalpy h1 of first state point, the enthalpy h2 of the second state point, main air blower Air output G2, by formula G1/ (G1+G2)=(h2-h3)/(h2-h1) be calculated main air blower blowout wind and return air fan blow The enthalpy h3 for the third state point that the wind gone out obtains after being mixed before sending to air outlet；

Mixed third state point is obtained on psychrometric chart, the corresponding temperature value of third state point is third after mixing The temperature value T3 of state point；

When the air output G2 of return air fan is maximized, the air conditioner indoor unit in the case where the air output of main air blower is G1 Wind pushing temperature air conditioner indoor unit when being run under current gear as main air blower highest wind pushing temperature.

Further, slip lid and micromotor, the output of the slip lid and micromotor are provided at the air outlet Axis connection, the micromotor are connect with microcontroller；The microcontroller controls the micromotor forward or reverse, described Slip lid described in minitype motor driving opens or closes the air outlet.

Further, the air supply outlet opening adjustment module is specifically configured to：

The air-supply of air outlet is obtained according to the areal calculation of the sum of air output of main air blower and return air fan and air outlet Wind speed, the sum of air output of blow wind speed=main air blower and return air fan/air-supply open area；

The air-supply wind speed of air outlet is judged whether in the air-supply wind speed range of preset air outlet, if air outlet is sent Wind wind speed is less than the air-supply wind speed minimum value of preset air outlet, then controls micromotor reversion, and minitype motor driving slip lid hides Keep off air outlet so that the aperture of air outlet reduces；If the air-supply wind speed of air outlet is more than the air-supply wind speed of preset air outlet Maximum value, control micromotor rotate forward, and minitype motor driving slip lid opens air outlet so that the aperture of air outlet increases.

According to the second aspect of the embodiment of the present application, present invention also provides a kind of air conditioner indoor unit of small temperature difference air-supply Control method comprising following steps：

Indoor temperature is acquired, and is initially powered up according to the determination of the difference of the indoor temperature of acquisition and preset indoor temperature value The gear of the corresponding main air blower of air quantity of Shi Suoxu, different difference sections correspond to the original speed position of different main air blowers；According to The variable quantity of indoor temperature determines that main air blower upshifts or downshifts in current gear in preset period of time；

The acquisition temperature and humidity value of sent air and air conditioner indoor unit return air inlet sections after evaporator heat exchange is handled The temperature and humidity value of interior air, and determine that main air blower is being worked as according to the maximum air supply rate of collected temperature and humidity value and return air fan The highest wind pushing temperature of air conditioner indoor unit when being run under preceding gear；

The highest of air conditioner indoor unit is blown warm when the wind pushing temperature manually set and main air blower are run under current gear Degree is compared, and determines practical wind pushing temperature according to comparison result；

The aperture of air outlet is adjusted according to the sum of air output of main air blower and return air fan, and according to determining practical air-supply Temperature, it is indoor by being sent by air outlet after the wind of evaporator heat exchange is mixed with the wind without evaporator heat exchange.

Further, the variable quantity according to indoor temperature in preset period of time determines main air blower in current gear liter Shelves or downshift include：

In cooling condition, if the difference of the temperature of the temperature and current time of last moment is in preset period of time On the occasion of and more than the first preset value, then main air blower downshifts, until dropping to set lowest gear；If in preset period of time The difference of the temperature of last moment and the temperature at current time is non-positive value or is positive value and is less than the second preset value, then main wind Machine upshifts, until being raised to set highest gear；If the temperature of last moment and current time in preset period of time The difference of temperature is between the second preset value and the first preset value, then main air blower maintains former gear operation；Described first is default Value is more than the second preset value；

In heating condition, if the difference of the temperature of the temperature and last moment at current time is in preset period of time On the occasion of and more than third preset value, then main air blower downshifts, until dropping to set lowest gear；If in preset period of time The difference of the temperature at current time and the temperature of last moment is non-positive value or is positive value and is less than the 4th preset value, then main wind Machine upshifts, until being raised to set highest gear；If the temperature at current time and last moment in preset period of time The difference of temperature is between the 4th preset value and third preset value, then main air blower maintains former gear operation；The third is default Value is more than the 4th preset value.

Further, the detailed process of the highest wind pushing temperature of the determining air conditioner indoor unit is：

Using the temperature and humidity value of collected air sent after evaporator heat exchange is handled as the warm and humid of first state point Angle value, using the temperature and humidity value of room air at the return air inlet of collected return air fan as the humiture of the second state point Value；According to the temperature T1 of first state point, humidity RH1, the enthalpy h1 of first state point is obtained by psychrometric chart；According to the second shape The temperature T2 of state point, humidity RH2 obtain the enthalpy h2 of the second state point by psychrometric chart；

The rotating speed of main air blower and return air fan is acquired, different rotating speeds corresponds to different air outputs；Setting main air blower is sent Air quantity is G1, and the air output of return air fan is G2；

In conjunction with psychrometric chart, the temperature value T3 of third state point, process are after being mixed：First is found on psychrometric chart State point and the second state point, the straight line for connecting first state point and the second state point intersect at a point with h3 lines, which is Third state point, the corresponding temperature value of third state point are the temperature value T3 of third state point after mixing；

When the air output G2 of return air fan is maximized, in the case of main air blower air output is G1, third state point is maximum Temperature value T3_maxThe highest wind pushing temperature of air conditioner indoor unit when being run under current gear as main air blower.

Further, it is described by the wind pushing temperature manually set and main air blower in operation under set gear air conditioner indoor unit Highest wind pushing temperature be compared, and determine that the detailed process of practical wind pushing temperature is according to comparison result：

Judge whether the wind pushing temperature manually set is more than the highest wind pushing temperature that air conditioner indoor unit can be provided, if It is that the air output of return air fan is then adjusted to maximum, using highest wind pushing temperature as practical wind pushing temperature, with highest wind pushing temperature Air-supply；Otherwise, the air output that return air fan is adjusted according to the wind pushing temperature that manually sets, using the wind pushing temperature manually set as Practical wind pushing temperature is blown with the wind pushing temperature manually set.

Further, the specific mistake of the aperture that air outlet is adjusted according to the sum of air output of main air blower and return air fan Cheng Wei：

The air-supply wind speed of air outlet is judged whether in the air-supply wind speed range of preset air outlet, if air outlet is sent Wind wind speed is less than the air-supply wind speed minimum value of preset air outlet, then reduces the aperture of air outlet；If the air-supply wind of air outlet Speed is more than the air-supply wind speed maximum value of preset air outlet, then increases the aperture of air outlet.According to the above-mentioned specific reality of the application Mode is applied it is found that at least having the advantages that：Microcontroller passes through according to collected at evaporator heat exchange in the application The temperature and humidity value of sent air after reason, the temperature and humidity value of room air and return air fan be most at air conditioner indoor unit return air inlet Big air output determines the highest wind pushing temperature of main air blower air conditioner indoor unit when running under setting gear, and will manually set The highest wind pushing temperature of air conditioner indoor unit when being run under setting gear is compared wind pushing temperature with main air blower, is tied according to comparing Fruit determines practical wind pushing temperature；Under determining practical wind pushing temperature, the wind of main air blower blowout passes through evaporator heat exchange, return air wind The wind of machine blowout is re-fed into interior without evaporator heat exchange after the mixing of this two parts wind；The application can be constant in refrigerating capacity In the case of, the wind pushing temperature of air conditioner indoor unit is improved, supply air temperature difference is reduced, keeps the wind that air conditioner indoor unit is blown out softer. The application, can be according to the sum of the air output of main air blower and return air fan also by the way that slip lid and micromotor are arranged at air outlet And the area of air outlet, it is moved by minitype motor driving slip lid, to adjust the aperture of air outlet, can ensure air outlet Wind speed and air supplying distance in the range of setting.

It is to be understood that above-mentioned general description and detailed description below are merely illustrative and illustrative, not The range to be advocated of the application can be limited.

Description of the drawings

Following appended attached drawing is a part for the description of the present application, depicts the example embodiment of the application, institute The principle for describing to be used for illustrating the application together of attached drawing and specification.

Fig. 1 is a kind of knot of the control system of the air conditioner indoor unit for small temperature difference air-supply that the application specific implementation mode provides Structure block diagram.

Fig. 2 is a kind of stream of the control method of the air conditioner indoor unit for small temperature difference air-supply that the application specific implementation mode provides Cheng Tu.

Fig. 3 be a kind of air conditioner indoor unit for small temperature difference air-supply that the application specific implementation mode provides structural schematic diagram it One.

Fig. 4 be a kind of air conditioner indoor unit for small temperature difference air-supply that the application specific implementation mode provides structural schematic diagram it Two.

Fig. 5 be a kind of air conditioner indoor unit for small temperature difference air-supply that the application specific implementation mode provides structural schematic diagram it Three.

Fig. 6 be a kind of air conditioner indoor unit for small temperature difference air-supply that the application specific implementation mode provides structural schematic diagram it Four.

Fig. 7 be a kind of air conditioner indoor unit for small temperature difference air-supply that the application specific implementation mode provides structural schematic diagram it Five.

Fig. 8 is the top partial view diagram of Fig. 7.

Fig. 9 be a kind of air conditioner indoor unit for small temperature difference air-supply that the application specific implementation mode provides structural schematic diagram it Six.

Figure 10 is the top partial view diagram of Fig. 9.

Figure 11 is a kind of structural schematic diagram of the air conditioner indoor unit for small temperature difference air-supply that the application specific implementation mode provides Seven.

Reference sign：

The air conditioner indoor unit of the small temperature difference air-supplies of 100-；200- microcontrollers；The first Temperature Humidity Sensors of 300-；400- second Temperature Humidity Sensor；1- shells；The main return air inlets of 2-；3- air outlets；31- slip lids；4- main air blowers；41- flows case；5- humidifications are single Member；51- water tanks；52- atomization and vaporization components；6- evaporators；7- return air filter elements；71- combines filter element；8- blew Filter unit；9- return air fans；Return air inlets of the 91- with Electric air valve；10- fresh wind ports；11- fresh air filter elements；The second main wind of 12- Machine；Return air inlets of the 121- with airtight valve.

Specific implementation mode

To make the purpose, technical scheme and advantage of the embodiment of the present application be more clearly understood, below will with attached drawing and in detail Narration clearly illustrates that the spirit of content disclosed herein, any skilled artisan are understanding teachings herein After embodiment, when the technology that can be taught by teachings herein, it is changed and modifies, without departing from the essence of teachings herein God and range.

The illustrative embodiments and their description of the application are not intended as the restriction to the application for explaining the application. In addition, in the drawings and embodiments the use of element/component of same or like label is for representing same or like portion Point.

About " first " used herein, " second " ... etc., not especially censure the meaning of order or cis-position, It is non-to limit the application, only for distinguishing the element described with same technique term or operation.

About direction term used herein, such as：Upper and lower, left and right, front or rear etc. are only the sides of refer to the attached drawing To.Therefore, the direction term used is intended to be illustrative and not intended to limit this creation.

It is the term of opening, i.e., about "comprising" used herein, " comprising ", " having ", " containing " etc. Mean including but not limited to.

About it is used herein " and/or ", include the things any or all combinations.

Include " two " and " two or more " about " multiple " herein；Include " two groups " about " multigroup " herein And " more than two ".

About term used herein " substantially ", " about " etc., to modify it is any can be with the quantity or mistake of microvariations Difference, but this slight variations or error can't change its essence.In general, microvariations that such term is modified or error Range in some embodiments can be 20%, in some embodiments can be 10%, can be in some embodiments 5% or its His numerical value.It will be understood by those skilled in the art that the aforementioned numerical value referred to can be adjusted according to actual demand, it is not limited thereto.

It is certain describing the word of the application by lower or discuss in the other places of this specification, to provide art technology Personnel's guiding additional in relation to the description of the present application.

As shown in Figure 1, this application provides a kind of control systems of the air conditioner indoor unit of small temperature difference air-supply comprising small temperature The air conditioner indoor unit 100 of difference air-supply, microcontroller 200, the first Temperature Humidity Sensor 300 and the second Temperature Humidity Sensor 400.

The air conditioner indoor unit 100 of small temperature difference air-supply includes shell, and the lower part of shell is provided with main return air inlet, the top of shell It is provided with air outlet, the aperture of air outlet is adjustable；It is single that the inside of shell is disposed with main air blower, humidification from bottom to top Member and evaporator；The inside of shell is additionally provided with return air fan；The wind of main air blower blowout passes through evaporator heat exchange, and return air fan goes out The wind blown is mixed without evaporator heat exchange, the wind of main air blower blowout and the wind of return air fan blowout before sending to air outlet It closes, mixed wind is got in by air outlet.Main air blower and return air fan are all made of speed-changing draught fan, to meet different operation moulds Requirement of the formula to air quantity.Motor in main air blower and return air fan is all made of EC motors (brush DC variable-frequency motor) or DC motors (direct current variable frequency motor) can carry out stepless speed regulation.

Microcontroller 200 is arranged in the air conditioner indoor unit 100 that the small temperature difference is blown.Main air blower and return air fan are and micro-control Device 200 processed connects.First Temperature Humidity Sensor 300 is arranged after evaporator, is used to acquire the air after evaporator heat exchange Humiture.Second Temperature Humidity Sensor 400 is arranged at the return air inlet of return air fan, is used to acquire without evaporator heat exchange Room air humiture., the first Temperature Humidity Sensor 300 and the second Temperature Humidity Sensor 400 connect with microcontroller 200 It connects.

Specifically, slip lid and micromotor, the output axis connection of slip lid and micromotor, micro electric are provided at air outlet Machine is connect with microcontroller 200.Microcontroller 200 control micromotor forward or reverse, minitype motor driving slip lid open or It closes air outlet and realizes the adjusting of air supply outlet opening so that the aperture of air outlet can change between 0~100%.

Wherein, microcontroller 200 includes main air blower gear determining module, highest wind pushing temperature determining module, practical air-supply Temperature determination module and air supply outlet opening adjustment module.Main air blower gear determining module be used for according to collected indoor temperature and The gear of the required corresponding main air blower of air quantity when the difference determination of preset indoor temperature value is initially powered up, according to preset time The variable quantity of indoor temperature determines that main air blower upshifts or downshifts in current gear in period.Highest wind pushing temperature determining module is used for According at collected temperature and humidity value by evaporator heat exchange treated air, air conditioner indoor unit return air inlet without steaming The temperature and humidity value of room air and the maximum air supply rate of return air fan of hair device heat exchange processing determine main air blower in current gear The highest wind pushing temperature of air conditioner indoor unit when lower operation.Practical wind pushing temperature determining module is used for according to the air-supply temperature manually set The comparison result of the highest wind pushing temperature of air conditioner indoor unit determines practical air-supply temperature when degree is run with main air blower under current gear Degree.Air supply outlet opening adjustment module is used to adjust the aperture of air outlet according to the sum of air output of main air blower and return air fan, makes Air outlet wind speed and air supplying distance in the range of setting, by evaporator heat exchange wind with without evaporator heat exchange The mixed wind of wind is sent into indoor by the air outlet after aperture regulation.

In some embodiments, the temperature and humidity value of the air sent after evaporator heat exchange is handled is as first state point Temperature and humidity value, the temperature value of the first state point is T1, humidity value RH1；At the return air inlet of the return air fan not Temperature and humidity value of the temperature and humidity value of the room air handled by evaporator heat exchange as the second state point, second state point Temperature value be T2, humidity value RH2.

The temperature and humidity value of temperature and humidity value and the second state point based on the first state point determines the main wind to realize The highest wind pushing temperature of machine air conditioner indoor unit when being run under setting gear, the highest wind pushing temperature determining module are specifically configured For：

According to the temperature T1 of first state point, humidity RH1, the enthalpy h1 of first state point is obtained by psychrometric chart；According to The temperature T2 of second state point, humidity RH2 obtain the enthalpy h2 of the second state point by psychrometric chart.

According to the air output G1 and return air fan of the enthalpy h1 of first state point, the enthalpy h2 of the second state point, main air blower Air output G2, by formula G1/ (G1+G2)=(h2-h3)/(h2-h1) be calculated main air blower blowout wind and return air fan blow The enthalpy h3 for the third state point that the wind gone out obtains after being mixed before sending to air outlet.

Mixed third state point is obtained on psychrometric chart, the corresponding temperature value of third state point is third after mixing The temperature value T3 of state point.

In some embodiments, slip lid and micromotor, the output axis connection of slip lid and micromotor are provided at air outlet； To realize that the aperture for adjusting air outlet according to the sum of air output of main air blower and return air fan, the air supply outlet opening adjust mould Block is specifically configured to：

The air-supply of air outlet is obtained according to the areal calculation of the sum of air output of main air blower and return air fan and air outlet Wind speed.Wherein, the sum of air output of air-supply wind speed=main air blower and return air fan/air-supply open area.

The air-supply wind speed of air outlet is judged whether in the air-supply wind speed range of preset air outlet,

If the air-supply wind speed of air outlet is less than the air-supply wind speed minimum value of preset air outlet, it is anti-to control micromotor Turn, minitype motor driving slip lid blocks air outlet so that the aperture of air outlet reduces；If the air-supply wind speed of air outlet is more than pre- If air outlet air-supply wind speed maximum value, control micromotor rotate forward, minitype motor driving slip lid open air outlet so that send The aperture in air port increases.

The control system of the air conditioner indoor unit of the small temperature difference air-supply of the application is used to control the air conditioner indoor unit of small temperature difference air-supply 100, main air blower and return air fan are provided in the shell of the air conditioner indoor unit 100 of small temperature difference air-supply；The wind warp of main air blower blowout Pervaporation device exchanges heat, and return air fan goes out the wind blown without evaporator heat exchange；Microcontroller 200 is according to collected through pervaporation The temperature and humidity value of air after device heat exchange processing, at air conditioner indoor unit return air inlet room air temperature and humidity value and return air fan Maximum air supply rate, determine the highest wind pushing temperature of air conditioner indoor unit when main air blower is run under current gear, and will manually set Fixed wind pushing temperature and main air blower the highest wind pushing temperature of air conditioner indoor unit when being run under setting gear are compared, according to than Relatively result determines practical wind pushing temperature；Under determining practical wind pushing temperature so that by evaporator heat exchange a part of wind with Room, the situation that the application can be constant in refrigerating capacity are re-fed into after being mixed without a part of wind of evaporator heat exchange Under, the wind pushing temperature of air conditioner indoor unit is improved, supply air temperature difference is reduced, keeps the wind that air conditioner indoor unit is blown out softer.The application Also by the way that slip lid and micromotor are arranged at air outlet, according to the sum of air output of main air blower and return air fan and can send The area in air port is moved by minitype motor driving slip lid, to adjust the aperture of air outlet, can ensure the wind speed of air outlet With air supplying distance in the range of setting.

As shown in Fig. 2, this application provides a kind of control methods of the air conditioner indoor unit of small temperature difference air-supply comprising following Step：

S1, acquisition indoor temperature, and determined initially according to the difference of the indoor temperature of acquisition and preset indoor temperature value The gear of the corresponding main air blower of required air quantity when booting, different difference sections correspond to the original speed position of different main air blowers. Determine that main air blower upshifts or downshifts in current gear according to the variable quantity of indoor temperature in preset period of time.

S2, acquisition are after evaporator heat exchange is handled at the temperature and humidity value of sent air and air conditioner indoor unit return air inlet The temperature and humidity value of room air, and determine that main air blower exists according to the maximum air supply rate of collected temperature and humidity value and return air fan The highest wind pushing temperature of air conditioner indoor unit when being run under current gear.

S3, when the wind pushing temperature manually set and main air blower runs under current gear air conditioner indoor unit highest air-supply Temperature is compared, and determines practical wind pushing temperature according to comparison result.

S4, the aperture that air outlet is adjusted according to the sum of air output of main air blower and return air fan, and according to determining reality Wind pushing temperature, by by the wind of evaporator heat exchange with without evaporator heat exchange the mixed wind of wind by adjust aperture after Air outlet is sent into indoor.

In above-mentioned steps S1, determine main air blower in current gear liter according to the variable quantity of indoor temperature in preset period of time Shelves or downshift include：

In cooling condition, if the difference of the temperature of the temperature and current time of last moment is in preset period of time On the occasion of and more than the first preset value, then main air blower downshifts, until dropping to set lowest gear；If in preset period of time The difference of the temperature of last moment and the temperature at current time is non-positive value or is positive value and is less than the second preset value, then main wind Machine upshifts, until being raised to set highest gear；If the temperature of last moment and current time in preset period of time The difference of temperature is between the second preset value and the first preset value, then main air blower maintains former gear operation；Described first is default Value is more than the second preset value.

In above-mentioned steps S2, determine that the detailed process of the highest wind pushing temperature of air conditioner indoor unit is：

Using the temperature and humidity value of collected air sent after evaporator heat exchange is handled as the warm and humid of first state point Angle value, using the temperature and humidity value of room air at the return air inlet of collected return air fan as the humiture of the second state point Value.

According to the temperature T1 of first state point, humidity RH1, the enthalpy h1 of first state point is obtained by psychrometric chart.According to The temperature T2 of second state point, humidity RH2 obtain the enthalpy h2 of the second state point by psychrometric chart.

The rotating speed of main air blower and return air fan is acquired, different rotating speeds corresponds to different air outputs.Wherein, main air blower is sent Air quantity is denoted as the first air output G1, and the air output of return air fan is denoted as the second air output G2.

According to the enthalpy h1 of first state point, the enthalpy h2 of the second state point, the first air output G1 and the second air output G2, The third that the wind of wind and return air fan blowout that main air blower blowout is calculated obtains after being mixed before sending to air outlet The enthalpy h3 of state point, detailed process are：

H3 is calculated by G1/ (G1+G2)=(h2-h3)/(h2-h1).

In conjunction with psychrometric chart, the temperature value T3 of third state point, detailed process are after being mixed：

First state point and the second state point are found on psychrometric chart, connect the straight line of first state point and the second state point It intersects at a point with h3 lines, which is third state point, and the corresponding temperature value of third state point is the third state after mixing The temperature value T3 of point.

When second air output G2 is maximized, main air blower is in the first air output G1, the maximum temperature of third state point Angle value T3_maxThe highest wind pushing temperature of air conditioner indoor unit when being run under current gear as main air blower.

In above-mentioned steps S3, by the wind pushing temperature manually set and main air blower in operation under set gear air conditioner indoor unit Highest wind pushing temperature be compared, and determine that the detailed process of practical wind pushing temperature is according to comparison result：

In a specific embodiment, when air conditioner indoor unit freezes, first state point is cooled down by evaporator, temperature It spends low；Second state point is not cooled down by evaporator, and temperature is high, is approximately equal to indoor temperature.The air-supply temperature manually set Degree is in T1~T3_maxBetween when, the wind pushing temperature that may be implemented is also in T1~T3_maxBetween, corresponding return air fan is from most Small air quantity is to the wind pushing temperature that between maximum quantity of wind, may be implemented in T1~T3_maxBetween.

In above-mentioned steps S4, the specific mistake of the aperture of air outlet is adjusted according to the sum of air output of main air blower and return air fan Cheng Wei：

The air-supply of air outlet is obtained according to the areal calculation of the sum of air output of main air blower and return air fan and air outlet Wind speed.The sum of air output of air-supply wind speed=main air blower and return air fan/air-supply open area.

The air-supply wind speed of air outlet is judged whether in the air-supply wind speed range of preset air outlet, if air outlet is sent Wind wind speed is less than the air-supply wind speed minimum value of preset air outlet, then reduces the aperture of air outlet；If the air-supply wind of air outlet Speed is more than the air-supply wind speed maximum value of preset air outlet, then increases the aperture of air outlet.Using the small temperature difference air-supply of the application The control method of air conditioner indoor unit 100 controls the air conditioner indoor unit 100 of small temperature difference air-supply, is changed by evaporator according to collected The temperature and humidity value of sent air after heat treatment, at air conditioner indoor unit return air inlet room air temperature and humidity value and return air fan Maximum air supply rate, determine the highest wind pushing temperature of air conditioner indoor unit when main air blower is run under current gear, and will manually set The highest wind pushing temperature of air conditioner indoor unit is compared when fixed wind pushing temperature is run with main air blower under current gear, according to than Relatively result determines practical wind pushing temperature, under determining practical wind pushing temperature so that by evaporator heat exchange a part of wind and Room, the situation that the application can be constant in refrigerating capacity are re-fed into after being mixed without a part of wind of evaporator heat exchange Under, wind pushing temperature is improved, supply air temperature difference is reduced, keeps the wind that air conditioner indoor unit is blown out softer.The application can also be according to master The area of the sum of air output of wind turbine and return air fan and air outlet, adjusts the aperture of air outlet, so as to ensure to blow The wind speed and air supplying distance of mouth are constant.

In some specific embodiments, the air conditioner indoor unit 100 of small temperature difference air-supply uses following structure type：

As shown in figure 3, the air conditioner indoor unit 100 of the small temperature difference air-supply shown in the present embodiment includes shell 1, under shell 1 Portion is provided with main return air inlet 2, and the top of shell 1 is provided with air outlet 3.It is provided with slip lid 31 at air outlet 3, slip lid 31 can be It is slided up and down at air outlet 3, so that the aperture of air outlet can change between 0~100%, realizes 3 size of air outlet Adjusting.

The inside of shell 1 is disposed with main air blower 4, humidifying unit 5 and evaporator 6 from bottom to top.It is set at main return air inlet 2 It is equipped with return air filter element 7, powered air-purifying unit 8 is provided at air outlet 3.The top of shell 1 is provided with return air fan 9, 1 top of shell is correspondingly arranged on the return air inlet 91 with Electric air valve with return air fan 9.

Return air filter element 7 is used to carry out first order filtering to the air for entering shell 1 from main return air inlet 2.Powered air-purifying Unit 8 is used to, to carrying out second level filtering to the air before indoor submitting after evaporator 6, can effectively filter out sky The microorganisms such as bacterium that gas carries after evaporator 6 and virus, additionally it is possible to filter out and be carried in the humidification water source of humidifying unit 5 The microorganisms such as bacterium and virus, while the white powder that atomization generates can also be humidified to humidifying unit 5 and carry out effectively intercepting filtering.

The wind that main air blower 4 is blown out is successively by the heat exchange of evaporator 6, after the filtering of powered air-purifying unit 8, in air outlet 3 Space between powered air-purifying unit 8 is mixed with the wind that return air fan 9 is blown out, and mixed wind is entered by air outlet 3 It is indoor.A part is re-fed into room, Neng Gou after the wind of heat exchange is mixed with a part without the wind of heat exchange in this way In the case that refrigerating capacity is constant, wind pushing temperature is improved, reduces supply air temperature difference, keeps the wind that air conditioner indoor unit is blown out softer.

In the present embodiment, it is additionally provided with fresh wind port 10 on the shell 1 of air conditioner indoor unit, fresh air is additionally provided in shell 1 Filter element 11.Fresh wind port 10 is arranged in the lower part of shell 1, is connect with the new wind turbine of outdoor unit, and fresh air filter element 11 is arranged At fresh wind port 10.Fresh air filter element 11 is used to be filtered to entering the fresh air in shell 1, to ensure to enter air conditioning chamber The cleanliness factor of interior machine inner air.Specifically, fresh air filter element 11 uses medium effeciency filter and inferior high efficiency filter.Fresh air exists Outdoor is sent by fresh wind port 10 in air conditioner indoor unit after slightly imitating filtering, by new wind turbine.

In the present embodiment, humidifying unit 5 includes water tank 51 and atomization and vaporization component 52.Wherein, water tank 51 is arranged In the bottom of shell 1, drawing and pulling type structure is used, facilitates user into water tank 51 plus water.The setting of atomization and vaporization component 52 exists One end of evaporator 6.Water tank 51 is connect by pipeline with atomization and vaporization component 52.

In the present embodiment, shell 1 uses rectangular parallelepiped structure, and the cross section of the rectangular parallelepiped structure is rectangle or fillet Square.Return air filter element 7 uses rectangular configuration, the air inlet of air side face main air blower 4, the air outlet of main air blower 4 Positioned at the lower section of evaporator 6 and face evaporator 6.

Return air filter element 7 is using just effect or medium air filtration module.Powered air-purifying unit 8 is using efficient or sub- high efficiency filter Module.Return air filter element 7 is different from the filter efficiency of both powered air-purifying units 8 and resistance, the grain of the particulate matter intercepted Diameter and dust containing capacity are also different, thus under same environment the replacement cycle of the different filters of identical size be different, pass through It is provided separately, the size of return air filter element 7 and powered air-purifying unit 8 can be optimized according to actual conditions, made up to Best matched combined.

In the present embodiment, main air blower 4 using axis into side go out without volute casing centrifugal blower fan, the air inlet of no volute casing centrifugal blower fan Angle between mouth and air outlet is 90 °.

In the present embodiment, powered air-purifying unit 8 uses rectangular parallelepiped structure, is inclined at air outlet 3 and evaporator 6 Between space in, and air outlet 3 is isolated with evaporator 6.

As shown in figure 4, the small temperature difference shown in air conditioner indoor unit 100 and Fig. 3 that the small temperature difference shown in the present embodiment is blown is sent The air conditioner indoor unit 100 of wind is essentially identical, the difference is that：Return air fan 9 is arranged in return air filter element 7 and main air blower 4 Between, and positioned at the lower section of evaporator 6, return air fan 9 is shifted to install with evaporator 6；It is right with return air fan 9 inside shell 1 The return air inlet 91 with Electric air valve should be provided with.The wind that return air fan 9 is blown out exchanges heat without evaporator 6.What main air blower 4 was blown out Wind exchanges heat by evaporator 6.A part is sent again after the wind of heat exchange is mixed with a part without the wind of heat exchange in this way Enter room, wind pushing temperature can be improved in the case where refrigerating capacity is constant, reduce supply air temperature difference, air conditioner indoor unit is made to blow out Wind is softer.

As shown in figure 5, the small temperature difference shown in air conditioner indoor unit 100 and Fig. 3 that the small temperature difference shown in the present embodiment is blown is sent The air conditioner indoor unit 100 of wind is essentially identical, the difference is that：1) it is provided with one at the air outlet of main air blower 4 and flows case 41, Flow rectangular configuration of the case 41 using both ends open.The import of stream case 41 and 4 air outlet of main air blower are equal sized.Flow case 41 Export the projection of face evaporator 6 in the horizontal plane.The area of the outlet of stream case 41 is greater than or equal to evaporator 6 in horizontal plane On projection area.So that sectional wind velocity is low, static pressure is high for such design, and sectional wind velocity is evenly distributed.2) at main return air inlet 2 Return air filter element 7 is not set, powered air-purifying unit 8 is not set at air outlet 3.3) setting combination filtering is single at main return air inlet 2 Member 71, combination filter element 71 is using efficient or sub- efficient combination filter.

As shown in fig. 6, the small temperature difference shown in air conditioner indoor unit 100 and Fig. 4 that the small temperature difference shown in the present embodiment is blown is sent The air conditioner indoor unit 100 of wind is essentially identical, the difference is that：1) it is provided with one at the air outlet of main air blower 4 and flows case 41, Flow rectangular configuration of the case 41 using both ends open.The import of stream case 41 and 4 air outlet of main air blower are equal sized.Flow case 41 Export the projection of face evaporator 6 in the horizontal plane.The area of the outlet of stream case 41 is greater than or equal to evaporator 6 in horizontal plane On projection area.So that sectional wind velocity is low, static pressure is high for such design, and sectional wind velocity is evenly distributed.2) at main return air inlet 2 Return air filter element 7 is not set, powered air-purifying unit 8 is not set at air outlet 3.3) setting combination filtering is single at main return air inlet 2 Member 71, combination filter element 71 is using efficient or sub- efficient combination filter.

As shown in Figure 7 and Figure 8, the small temperature shown in air conditioner indoor unit 100 and Fig. 3 of the small temperature difference air-supply shown in the present embodiment The air conditioner indoor unit 100 of difference air-supply is essentially identical, the difference is that：1) shell 1 uses cylindrical structure.2) main air blower 4 is adopted With axis go out after without volute casing centrifugal blower fan, air inlet and the air outlet of no volute casing centrifugal blower fan are located along the same line, and into Air port is oppositely arranged with air outlet.3) return air filter element 7 uses the first cylinder shape structure.The first cylinder shape structure is from outside to inside Filtering rank increase successively, wherein the outer layer of the first cylinder shape structure use primary filter, internal layer use medium air filtration Device.The middle cavity of the first cylinder shape structure forms the first air duct.Fresh air filter element 10 is arranged in the first cylinder shape structure The bottom of middle cavity.4) powered air-purifying unit 8 uses the second cylinder shape structure, and the second cylinder shape structure is using sub- high efficiency filter Device or high efficiency particulate air filter.The middle cavity of the second cylinder shape structure forms the second air duct.Slip lid 31 can be at air outlet 3 along circle Week sliding.5) there are two the settings of return air fan 9, two return air fans 9 are symmetricly set on along the central axes of 1 top surface of shell and blew It filters in the space between unit 8 and shell 1, the return air inlet with Electric air valve is correspondingly arranged on return air fan 9 on shell 1 91。

The wind that return air fan 9 is blown out exchanges heat without evaporator 6.The wind that main air blower 4 is blown out exchanges heat by evaporator 6.This A sample part by the wind of heat exchange with a part without heat exchange wind mixed after be re-fed into room, can refrigerating capacity not In the case of change, wind pushing temperature is improved, reduces supply air temperature difference, keeps the wind that air conditioner indoor unit is blown out softer.

As shown in Figure 9 and Figure 10, the air conditioner indoor unit 100 of the small temperature difference air-supply shown in the present embodiment is shown with Fig. 7 and Fig. 8 The small temperature difference air-supply air conditioner indoor unit 100 it is essentially identical, the difference is that：1) return air filter element 7 and air-supply are not provided with Filter element 8, setting combination filter element 71 at main return air inlet 2, combination filter element 71 is using efficiently or efficient group sub- Close filter.2) it is provided with the second main air blower 12 and return air fan 9, the second main air blower 12 is arranged in the side of evaporator 6, return air Wind turbine is arranged in the space between the second main air blower 12 and shell 1.3) on shell 1, it is located at the other side of evaporator 6, with Second main air blower 12 is correspondingly arranged on the return air inlet 121 with airtight valve；On shell 1, electrification is correspondingly arranged on return air fan 9 The return air inlet 91 of dynamic air-valve.

The wind that return air fan 9 is blown out exchanges heat without evaporator 6.Main air blower 4 and the wind of the second main air blower 12 blowout pass through Evaporator 6 exchanges heat.A part is re-fed into room after the wind of heat exchange is mixed with a part without the wind of heat exchange in this way, Wind pushing temperature can be improved in the case where refrigerating capacity is constant, reduce supply air temperature difference, keep the wind that air conditioner indoor unit is blown out more soft With.

As shown in figure 11, the small temperature difference shown in air conditioner indoor unit 100 and Fig. 3 of the small temperature difference air-supply shown in the present embodiment is sent The air conditioner indoor unit 100 of wind is essentially identical, the difference is that：1) shell 1 uses cylindrical structure.2) return air filter element 7 Using columnar structured.Columnar structured filtering rank from outside to inside increases successively, wherein columnar structured outer layer uses Primary filter, internal layer use medium effeciency filter.Columnar structured middle cavity forms air duct, and the wind by filtering is thus Air duct enters the air inlet of main air blower 4.3) main air blower 4 using axis go out after without volute casing centrifugal blower fan, no volute casing centrifugal blower fan Air inlet be located along the same line with air outlet, and air inlet is oppositely arranged with air outlet.

The foregoing is merely the schematical specific implementation modes of the application, before the design and principle for not departing from the application It puts, the equivalent variations and modification that any those skilled in the art is made, the range of the application protection should all be belonged to.

Claims

1. a kind of control system of the air conditioner indoor unit of small temperature difference air-supply, which is characterized in that it includes the air-conditioning of small temperature difference air-supply Indoor unit, microcontroller, the first Temperature Humidity Sensor and the second Temperature Humidity Sensor；

The air conditioner indoor unit of the small temperature difference air-supply includes shell, and the lower part of shell is provided with main return air inlet, and the top of shell is set It is equipped with air outlet, the aperture of air outlet is adjustable；The inside of shell is disposed with main air blower, humidifying unit from bottom to top And evaporator；The inside of shell is additionally provided with return air fan；The wind of main air blower blowout passes through evaporator heat exchange, and return air fan goes out to blow Wind without evaporator heat exchange, the wind of main air blower blowout and the wind of return air fan blowout are mixed before sending to air outlet It closes, mixed wind is got in by air outlet；

The main air blower, return air fan, the first Temperature Humidity Sensor and the second Temperature Humidity Sensor connect with the microcontroller It connects, first Temperature Humidity Sensor is used to acquire the humiture of the air after evaporator heat exchange, second temperature and humidity sensing Device is used to acquire the humiture of the room air without evaporator heat exchange.

2. the control system of the air conditioner indoor unit of small temperature difference air-supply as described in claim 1, which is characterized in that the microcontroller Device includes that main air blower gear determining module, highest wind pushing temperature determining module, practical wind pushing temperature determining module and air outlet are opened Spend adjustment module；

The main air blower gear determining module is used for true according to the difference of collected indoor temperature and preset indoor temperature value The gear of the corresponding main air blower of required air quantity, the variable quantity according to indoor temperature in preset period of time are true when being initially powered up surely Determine main air blower to upshift or downshift in current gear；The highest wind pushing temperature determining module is used for according to collected through pervaporation The temperature and humidity value of sent air after device heat exchange processing, at air conditioner indoor unit return air inlet without the interior of evaporator heat exchange processing The temperature and humidity value of air and the maximum air supply rate of return air fan determine air conditioner indoor unit when main air blower is run under current gear Highest wind pushing temperature；The practical wind pushing temperature determining module is used to worked as with main air blower according to the wind pushing temperature manually set The comparison result of the highest wind pushing temperature of air conditioner indoor unit determines practical wind pushing temperature when being run under preceding gear；The air outlet is opened Spend the aperture that adjustment module is used to adjust air outlet according to the sum of air output of main air blower and return air fan so that the wind of air outlet Speed and air supplying distance are in setting range.

3. the control system of the air conditioner indoor unit of small temperature difference air-supply as claimed in claim 2, which is characterized in that described by steaming Send out temperature and humidity value of the temperature and humidity value of sent air after device heat exchange is handled as first state point, the temperature of the first state point Value is T1, humidity value RH1；The temperature of the room air handled without evaporator heat exchange at the return air inlet of the return air fan The temperature value of temperature and humidity value of the humidity value as the second state point, second state point is T2, humidity value RH2；Main air blower The highest wind pushing temperature determining module is specifically configured to when being run under current gear：

According to the temperature T1 of first state point, humidity RH1, the enthalpy h1 of first state point is obtained by psychrometric chart；According to second The temperature T2 of state point, humidity RH2 obtain the enthalpy h2 of the second state point by psychrometric chart；

According to the enthalpy h1 of first state point, the enthalpy h2 of the second state point, the air output G1 of main air blower and sending for return air fan Air quantity G2, by formula G1/ (G1+G2)=(h2-h3)/(h2-h1) be calculated main air blower blowout wind and return air fan blowout The enthalpy h3 for the third state point that wind obtains after being mixed before sending to air outlet；

Mixed third state point is obtained on psychrometric chart, the corresponding temperature value of third state point is the third state after mixing The temperature value T3 of point；

When the air output G2 of return air fan is maximized, in the case where the air output of main air blower is G1, air conditioner indoor unit send The highest wind pushing temperature of air conditioner indoor unit when air temperature is run as main air blower under current gear；The gear of regulating main air machine, It can obtain highest wind pushing temperature of the main air blower under different air outputs.

4. the control system of the air conditioner indoor unit of small temperature difference air-supply as claimed in claim 2, which is characterized in that the air outlet Place is provided with slip lid and micromotor, the output axis connection of the slip lid and micromotor, the micromotor and microcontroller Connection；The microcontroller controls the micromotor forward or reverse, and slip lid plays on or off described in the minitype motor driving Close the air outlet.

5. the control system of the air conditioner indoor unit of small temperature difference air-supply as claimed in claim 4, which is characterized in that the air outlet Aperture regulation module is specifically configured to：

The air-supply wind speed of air outlet is obtained according to the areal calculation of the sum of air output of main air blower and return air fan and air outlet, The sum of air output of air-supply wind speed=main air blower and return air fan/air-supply open area；

Judge that the air-supply wind speed of air outlet is in the air-supply wind speed range of preset air outlet, if the air-supply wind speed of air outlet Less than the air-supply wind speed minimum value of preset air outlet, then micromotor reversion is controlled, minitype motor driving slip lid blocks air-supply Mouthful so that the aperture of air outlet reduces；If the air-supply wind speed of air outlet is more than the air-supply wind speed maximum value of preset air outlet, It controls micromotor to rotate forward, minitype motor driving slip lid opens air outlet so that the aperture of air outlet increases.

6. a kind of control method of the air conditioner indoor unit of small temperature difference air-supply, which is characterized in that include the following steps：

Indoor temperature is acquired, and when institute is initially powered up according to the determination of the difference of the indoor temperature of acquisition and preset indoor temperature value The gear of the corresponding main air blower of air quantity needed, different difference sections corresponds to the original speed position of different main air blowers；According to default The variable quantity of indoor temperature determines that main air blower upshifts or downshifts in current gear in time cycle；

Acquisition is by room air at evaporator heat exchange treated aerial temperature and humidity value and air conditioner indoor unit return air inlet Temperature and humidity value, and determine main air blower under current gear according to the maximum air supply rate of collected temperature and humidity value and return air fan The highest wind pushing temperature of air conditioner indoor unit when operation；

When the wind pushing temperature manually set and main air blower are run under current gear the highest wind pushing temperature of air conditioner indoor unit into Row compares, and determines practical wind pushing temperature according to comparison result；

The aperture of air outlet is adjusted according to the sum of air output of main air blower and return air fan, and according to determining practical air-supply temperature Degree, it is indoor by being sent by air outlet after the wind of evaporator heat exchange is mixed with the wind without evaporator heat exchange.

7. the control method of the air conditioner indoor unit of small temperature difference air-supply as claimed in claim 6, which is characterized in that the basis is pre- If the variable quantity of indoor temperature determines that main air blower upshifts in current gear or downshift includes in the time cycle：

In cooling condition, if the difference of the temperature of the temperature and current time of last moment is positive value in preset period of time And being more than the first preset value, then main air blower downshifts, until dropping to set lowest gear；If upper one in preset period of time The difference of the temperature at moment and the temperature at current time is non-positive value or is positive value and is less than the second preset value, then main air blower liter Shelves, until being raised to set highest gear；If the temperature of the temperature of last moment and current time in preset period of time Difference between the second preset value and the first preset value, then main air blower maintains former gear operation；First preset value is big In the second preset value；

In heating condition, if the difference of the temperature of the temperature and last moment at current time is positive value in preset period of time And being more than third preset value, then main air blower downshifts, until dropping to set lowest gear；If current in preset period of time The difference of the temperature at moment and the temperature of last moment is non-positive value or is positive value and is less than the 4th preset value, then main air blower liter Shelves, until being raised to set highest gear；If the temperature of the temperature at current time and last moment in preset period of time Difference between the 4th preset value and third preset value, then main air blower maintains former gear operation；The third preset value is big In the 4th preset value.

8. the control method of the air conditioner indoor unit of small temperature difference air-supply as claimed in claim 6, which is characterized in that described determining empty The detailed process of highest wind pushing temperature of indoor unit is adjusted to be：

Using the temperature and humidity value of collected air sent after evaporator heat exchange is handled as the temperature and humidity value of first state point, Using the temperature and humidity value of room air at the return air inlet of collected return air fan as the temperature and humidity value of the second state point；According to The temperature T1 of first state point, humidity RH1 obtain the enthalpy h1 of first state point by psychrometric chart；According to the second state point Temperature T2, humidity RH2 obtain the enthalpy h2 of the second state point by psychrometric chart；

The rotating speed of main air blower and return air fan is acquired, different rotating speeds corresponds to different air outputs；Set the air output of main air blower Air output for G1, return air fan is G2；

In conjunction with psychrometric chart, the temperature value T3 of third state point, process are after being mixed：First state is found on psychrometric chart Point and the second state point, the straight line for connecting first state point and the second state point intersect at a point with h3 lines, which is third State point, the corresponding temperature value of third state point are the temperature value T3 of third state point after mixing；

When the air output G2 of return air fan is maximized, in the case of main air blower air output is G1, third state point maximum temperature Value T3_maxThe highest wind pushing temperature of air conditioner indoor unit when being run under current gear as main air blower.

9. the control method of the air conditioner indoor unit of small temperature difference air-supply as claimed in claim 6, which is characterized in that it is described will be artificial The highest wind pushing temperature of air conditioner indoor unit when being run under setting gear is compared the wind pushing temperature of setting with main air blower, and root Determine that the detailed process of practical wind pushing temperature is according to comparison result：

Judge whether the wind pushing temperature manually set is more than what air conditioner indoor unit can be provided under the operation of main air blower current gear Highest wind pushing temperature, if it is, the air output of return air fan is adjusted to maximum, using highest wind pushing temperature as practical air-supply temperature Degree is blown with highest wind pushing temperature；Otherwise, the air output that return air fan is adjusted according to the wind pushing temperature manually set, will be artificial The wind pushing temperature of setting is used as practical wind pushing temperature, is blown with the wind pushing temperature manually set.

10. the control method of the air conditioner indoor unit of small temperature difference air-supply as claimed in claim 6, which is characterized in that the basis The detailed process of aperture that the sum of air output of main air blower and return air fan adjusts air outlet is：

Judge that the air-supply wind speed of air outlet is in the air-supply wind speed range of preset air outlet, if the air-supply wind speed of air outlet Less than the air-supply wind speed minimum value of preset air outlet, then reduce the aperture of air outlet；If the air-supply wind speed of air outlet is more than The air-supply wind speed maximum value of preset air outlet, then increase the aperture of air outlet.