Air treatment device and control method thereof

Abstract

The invention discloses an air treatment device and a control method, and belongs to the technical field of air treatment. The air treatment device comprises a fresh air duct and an exhaust air duct. A heat exchanger; the water pan is arranged below the heat exchanger and is used for collecting condensate water generated by the heat exchanger; the float switch is arranged in the water pan, and the float switch is turned on when the water level in the water pan reaches a preset trigger water level and turned off when the water level is lower than the preset trigger water level; the drainage pump is connected with the water pan and used for pumping condensate water; wherein the air humidity of the windward side of the heat exchanger in the fresh air duct is the target humidity; the control method comprises the steps that the humidity interval where the target humidity is located is determined according to the target humidity and a plurality of preset humidity intervals; the condensate water generation amount of the heat exchanger is calculated according to the upper limit value of the humidity interval where the target humidity is located; calculating the running time of the drainage pump according to the condensate water generation amount. The air treatment device reduces the use frequency of the water pump and prolongs the service life of the water pump.

Description

Technical Field

[0001] The present application relates to the field of air treatment technology, and in particular to an air treatment device and a control method thereof. Background Art

[0002] In air handling units, heat exchangers are often used. The condensed water generated by the heat exchanger is discharged by a drain pump. During cooling operation, the drain pump is always in the open state to ensure the smooth discharge of condensed water.

[0003] However, if there is less moisture in the ambient air, the drainage pump may idle for a long time, which not only affects the noise of the whole machine and the life of the drainage pump itself, but also increases the energy consumption of the device. Summary of the Invention

[0004] The present application provides an air treatment device and a control method thereof, which reduces the use frequency of a water pump and increases the service life of the water pump.

[0005] The air handling device includes: a housing; a fan, disposed within the housing, for driving air flow; a heat exchanger, for exchanging heat with the air passing therethrough; a water collection pan, disposed below the heat exchanger, for collecting condensed water generated by the heat exchanger; a float switch, disposed within the water collection pan, which opens when the water level in the water collection pan reaches a preset trigger level and closes when the water level falls below the preset trigger level; and a drain pump, connected to the water collection pan, for pumping out the condensed water.

[0006] The air supplied to the room by the air handling device is the target air, and the target air humidity on the windward side of the heat exchanger is the target humidity;

[0007] The control method includes: obtaining target humidity; determining the humidity interval in which the target humidity is located based on the target humidity and multiple preset humidity intervals; calculating the amount of condensed water generated by the heat exchanger based on the upper limit value of the humidity interval in which the target humidity is located; and calculating the operating time of the drainage pump based on the amount of condensed water generated.

[0008] In some embodiments, when the target humidity is greater than a first preset humidity value and not greater than a second preset humidity value, the drain pump is controlled to operate when the float switch is turned on.

[0009] In some embodiments, when the target humidity is not greater than a first preset humidity value, a safe time for water to continue to be stored after the float switch is triggered is calculated based on the first preset humidity value and a preset safe water storage volume;

[0010] When the float switch is turned on, the drainage pump is controlled not to be turned on. When the float switch is turned on, the drainage pump is controlled to be turned on after a safety time.

[0011] In some embodiments, when the float switch changes from on to off, the time for which the drain pump needs to continue running is calculated based on the upper limit value of the humidity range in which the target humidity is located.

[0012] In some embodiments, when the target humidity is greater than a second preset humidity value, the fan is controlled to slow down and the drainage pump is started when the float switch is turned on.

[0013] In some embodiments, the drainage pump has N gear values ​​corresponding to power and drainage parameters;

[0014] When the amount of condensed water generated is less than the drainage parameter of the first gear, the power of the drainage pump is determined to be the power of the first gear;

[0015] When the amount of condensed water generated is not less than the drainage parameter of the first gear and is less than the drainage parameter of the second gear, the power of the drainage pump is determined to be the power of the second gear; and so on, when the amount of condensed water generated is not less than the drainage parameter of the N-1th gear and is less than the drainage parameter of the Nth gear, the power of the drainage pump is determined to be the power of the Nth gear.

[0016] In some embodiments, when the float switch is on for no less than a first preset time, the power of the drainage pump is increased and the fan speed is reduced; when the float switch is on for no less than a second preset time, the drainage pump is determined to be abnormal, an alarm signal is sent, and the pump is shut down; wherein the second preset time is greater than the first preset time.

[0017] In some embodiments, the housing includes a fresh air duct and an exhaust air duct; the heat exchanger includes a first heat exchanger provided in the fresh air duct and a second heat exchanger provided in the exhaust air duct;

[0018] The air treatment device further includes: an adsorption module, including a first adsorption module provided on the air outlet side of the first heat exchanger, and a second adsorption module provided on the air outlet side of the second heat exchanger;

[0019] The humidity of the air inlet of the fresh air duct is the target humidity;

[0020] The controller is used to calculate the amount of condensed water generated based on the humidity of the air outlets at both ends of the fresh air duct and the humidity of the air outlets at both ends of the exhaust duct, wherein the target humidity is replaced by the upper limit value of the humidity range in which the target humidity is located.

[0021] In some embodiments, the invention further comprises: an external water pump connected to the drainage pump via an external drainage pipe;

[0022] The controller is used to: when the machine is shut down or the power is off, if there is an abnormal alarm of the float switch, control the external water pump to run for a third preset time; if there is no alarm, control the running time of the external water pump to be less than the third preset time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 shows a schematic diagram of an air handling device according to some embodiments;

[0024] Figure 2 A schematic diagram illustrating a flow path of an air treatment device in a first state according to some embodiments;

[0025] Figure 3 A schematic diagram illustrating a flow path of an air treatment device in a second state according to some embodiments;

[0026] Figure 4 shows a control flow chart of an air handling device according to some embodiments;

[0027] Figure 5 A schematic diagram illustrating a drainage scenario of an air handling device according to some embodiments;

[0028] Figure 6 A schematic diagram illustrating another drainage scenario of an air handling device according to some embodiments;

[0029] In the above figures, 110, shell; 111, first air processing chamber; 112, second air processing chamber; 113, machine chamber; 210, supply fan; 220, exhaust fan; 310, first adsorption module; 320, second adsorption module; 400, air valve switching device; 13, first heat exchanger; 14, second heat exchanger; 21, water collecting pan; 22, drain pump; 23, external drain pipe; 24, external water pump. DETAILED DESCRIPTION

[0030] In order to make the purpose and implementation of this application clearer, the exemplary implementation of this application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only part of the embodiments of this application, not all of the embodiments.

[0031] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0034] Air handling devices, such as fresh air humidifiers and air conditioners, all use refrigerant systems. The refrigerant system includes a compressor, condenser, expansion valve, and evaporator.

[0035] The air handling device in this application performs a refrigeration cycle by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

[0036] The compressor compresses low-temperature, low-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0037] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves cooling by utilizing the latent heat of evaporation to exchange heat with the material being cooled.

[0038] The following is an introduction using the fresh air humidifier as an example:

[0039] Fresh air humidifiers usually include adsorption materials, which absorb water through the adsorption action of the adsorption material, thereby drying the air and achieving the purpose of dehumidification; through the regeneration action of the adsorption material, water is evaporated from the adsorbent, thereby humidifying the air and achieving the purpose of humidification.

[0040] The evaporator and condenser of the refrigerant system are used to adjust the air temperature on the windward side of the adsorption material. During dehumidification, the evaporator cools the air temperature at the adsorption material inlet, allowing the moisture in the air to be better adsorbed by the adsorption material; during humidification, the condenser heats the air temperature at the adsorption material inlet, causing the adsorption material to be heated and regenerated.

[0041] There are usually three forms of implementation of adsorption materials: the first is to make the adsorption material into an adsorption wheel; the second is to coat the adsorption material on the evaporator and condenser; the third is to make the adsorption material into two adsorption modules.

[0042] In the embodiment of the adsorption wheel, the adsorption wheel has a first adsorption module corresponding to the fresh air duct and a second adsorption module corresponding to the exhaust air duct, and one of the first adsorption module and the second adsorption module is used as an adsorption zone and the other is used as a regeneration zone.

[0043] When the humidifier dehumidifies outdoor air, outdoor air is introduced into the fresh air duct, so that the outdoor air is cooled when passing through the evaporator, and then moisture is removed by passing through the adsorption area of ​​the adsorption wheel before being supplied to the room; indoor air is introduced into the exhaust duct, and the condenser first heats the indoor air, and then when the indoor air passes through the regeneration area of ​​the adsorption wheel, the moisture absorbed by the adsorption wheel in the adsorption area is released into the indoor air, thereby regenerating the adsorption material.

[0044] That is, the adsorption area of ​​the adsorption wheel absorbs moisture from the outdoor air. As the adsorption wheel rotates, the adsorption area rotates to the exhaust duct and becomes a regeneration area. The absorbed moisture is then discharged to the outside along with the indoor air.

[0045] Similarly, when a humidifier is humidifying, the adsorption wheel absorbs moisture from the indoor air in the exhaust duct and supplies it to the outdoor air in the fresh air duct, humidifying the outdoor air. The rotation of the adsorption wheel transfers moisture between the indoor and outdoor air.

[0046] In the embodiment where the adsorption material is coated on two heat exchangers, the two heat exchangers to which the adsorption material is attached constitute the first humidity conditioning component and the second humidity conditioning component, respectively.

[0047] In the embodiment where the adsorption material is made into two adsorption modules, one set of heat exchangers and adsorption modules constitutes a first humidity control component, and the other set of heat exchangers and adsorption modules constitutes a second humidity control component.

[0048] The four-way valve of the refrigerant system is switched according to a preset cycle or preset conditions, and the first humidity control component and the second humidity control component alternately function as a dehumidifier and a humidifier, thereby repeatedly absorbing and discharging water.

[0049] Both embodiments also require a damper switching device. This device switches the air flow between the first and second humidity control components. The damper switching device determines whether outdoor air flows through the dehumidifier or humidifier, while indoor air flows through the other. For example, when dehumidifying fresh air, the damper switching device ensures that outdoor air always flows through the dehumidifier and indoor air always flows through the humidifier. When humidifying fresh air, the damper switching device ensures that outdoor air always flows through the humidifier and indoor air always flows through the dehumidifier.

[0050] Reference Figure 1 The humidity control machine according to the embodiment of the present application includes a housing 110, an adsorption module, a damper switching device 400 and a refrigerant system.

[0051] The housing 110 is provided with four air vents, namely, a fresh air inlet OA, a fresh air supply vent SA, an indoor return air vent RA, and an indoor exhaust vent EA. The fresh air inlet OA and the fresh air supply vent SA are connected to form a fresh air duct, and the indoor return air vent RA and the indoor exhaust vent EA are connected to form an exhaust duct.

[0052] In actual application scenarios, the indoor return air outlet RA and the fresh air supply outlet SA are extended to the target room through external air ducts, and the indoor exhaust outlet EA and the fresh air inlet OA are extended to the outdoors through external air ducts.

[0053] An air processing chamber is provided within the housing 110, which is used to dehumidify or humidify fresh air. The air processing chamber includes a first air processing chamber 111 and a second air processing chamber 112. The first air processing chamber 111 houses a first heat exchanger 13 and a first adsorption module 310, while the second air processing chamber 112 houses a second heat exchanger 14 and a second adsorption module 320. The first heat exchanger 13 is located on the windward side of the first adsorption module 310, while the second heat exchanger 14 is located on the windward side of the second adsorption module 320.

[0054] The air handling chamber is located in the middle of the housing 110. The front and rear ends of the air handling chamber are provided with a damper switching device 400, which can switch between a first state and a second state. Figure 1 and Figure 2 In the first state, the first air processing chamber 111 is connected to the fresh air inlet OA and the fresh air supply outlet SA, and the second air processing chamber 112 is connected to the indoor return air outlet RA and the indoor exhaust air outlet EA, that is, the first air processing chamber 111 is connected to the fresh air duct, and the second air processing chamber 112 is connected to the exhaust duct; refer to Figure 1 and Figure 3In the second state, the first air processing chamber 111 is connected to the indoor return air outlet RA and the indoor exhaust air outlet EA, and the second air processing chamber 112 is connected to the fresh air inlet OA and the fresh air supply outlet SA, that is, the first air processing chamber 111 is connected to the exhaust air duct, and the second air processing chamber 112 is connected to the fresh air duct.

[0055] The fresh air humidifier also includes a blower 210 and an exhaust fan 220. The blower 210 is provided corresponding to the fresh air supply outlet SA for driving the flow of outdoor air; the exhaust fan 220 is provided corresponding to the indoor exhaust outlet EA for driving the flow of indoor air.

[0056] The four-way valve of the refrigerant system is switched to any one of a first switching state and a second switching state. In the first switching state, the first heat exchanger acts as an evaporator and the second heat exchanger acts as a condenser; in the second switching state, the first heat exchanger acts as a condenser and the second heat exchanger acts as an evaporator.

[0057] The four-way valve switches periodically between the first switching state and the second switching state according to preset conditions; at the same time, the air valve switching device switches periodically between the first state and the second state to ensure the continuous operation of the adsorption material.

[0058] In cooling mode, moisture carried by the outdoor fresh air must first pass through the evaporator to generate condensed water, which is then absorbed by the adsorption material. The water in the adsorption material is then removed by the indoor exhaust air, thereby preventing the moisture carried by the outdoor fresh air from entering the room. However, in the case of severe southerly weather, the humidity in the air is high, and the exhaust fan 220 alone cannot completely remove the moisture from the adsorption material out of the device. Some condensed water will drip from the evaporator and adsorption module into the water receiving tray 21, requiring the assistance of the drain pump 22 for drainage.

[0059] Therefore, the fresh air humidifier in this application also includes a water receiving tray 21 and a drainage pump 22. The water receiving tray 21 is provided below the heat exchanger to collect the condensed water flowing down the heat exchanger; the drainage pump 22 discharges the condensed water by pumping.

[0060] In some embodiments, the area occupied by the fresh air duct and the exhaust air duct within the housing 110 is referred to as the duct cavity. The housing 111 also includes a machine cavity 113, which is located below the duct cavity. The machine cavity 113 can accommodate the refrigerant system's compressor, four-way valve, and other components.

[0061] A drainage hole 210 is provided at the lowest point of the water receiving tray 21 , and the drainage pump 22 is connected to the drainage hole 210 via a connecting pipe.

[0062] The drainage pump 22 is installed in the machine cavity 113, and the drainage hole 210 is located above the drainage pump 22, so that the condensed water can also be discharged by natural downward flow when the device is not in operation.

[0063] The float switch 23 is provided in the water receiving tray 21 . When the water level in the water receiving tray 21 reaches the triggering water level of the float switch 23 , the float switch 23 is turned on. When the water level in the water receiving tray 21 is lower than the triggering water level, the float switch 24 is turned off.

[0064] In the related art, in cooling mode, to prevent excessive condensation, the drain pump 22 remains in a constantly open state. In heating mode, the drain pump 22 is linked to a float switch 23, and operates when the water level reaches the trigger height of the float switch 23. It stops when the water level drops below zero. In this control mode, in cooling mode, if the air in the northern inland environment is low in moisture, the drain pump 22 may idle for a long time, which not only affects the noise level of the entire unit and the life of the drain pump 22 itself, but also increases the energy consumption of the device. In heating mode, if the water level drops below the float switch 24 and the drain pump 22 stops operating, some water may remain in the water tray 21, which can easily form scale and breed bacteria.

[0065] The present application adjusts the operating time of the drainage pump 22 by judging the air humidity value, reduces the use frequency of the drainage pump 22 while meeting the drainage requirements, increases the service life of the drainage pump 22, and reduces the energy consumption of the device.

[0066] Hereinafter, signal flows between components included in the fresh air humidifier will be described.

[0067] The humidifier includes a controller, a memory and a humidity sensor.

[0068] The memory stores humidity statistics for different regions and seasons. The method for obtaining this data is applicable to existing technologies. The present application further divides the humidity statistics into multiple humidity intervals, which are stored in the memory. Furthermore, the memory may also store performance parameters of a drainage pump.

[0069] The outdoor air humidity sensor is used to detect the humidity of the outdoor air. The outdoor air humidity sensor can be set at the fresh air inlet OA.

[0070] The fresh air supply humidity sensor is used to detect the humidity of the fresh air supply. The fresh air supply humidity sensor can be set at the fresh air supply outlet SA.

[0071] The indoor air humidity sensor is used to detect the humidity of the indoor air. The indoor air humidity sensor can be set at the indoor return air outlet EA.

[0072] The indoor exhaust humidity sensor is used to detect the humidity of the indoor exhaust air. The indoor exhaust humidity sensor can be set at the indoor exhaust outlet RA.

[0073] The controller 600 is used to adjust the working state of the drainage pump 22 according to the humidity value detected by the temperature sensor and the signal of the float switch.

[0074] The specific control process of the drainage pump 22 in this application is introduced below.

[0075] First of all, it should be noted that the fresh air humidifier mainly adjusts the temperature and humidity of the outdoor air and then sends it into the room. Therefore, in this embodiment, the outdoor air is referred to as the target air, and the target air humidity on the windward side of the heat exchanger will affect the amount of condensed water generated by the heat exchanger. Therefore, the target air humidity on the windward side of the heat exchanger is also referred to as the target humidity.

[0076] The target humidity can be used to calculate the amount of condensed water generated by the heat exchanger. Specifically, the target humidity can be the humidity at the fresh air inlet OA. Based on the outdoor air humidity and the humidity of the other three air outlets, the humidity difference S (g / kg) = OA-SA + RA-EA can be calculated. The amount of condensed water generated by the heat exchanger P (kg / h) = humidity difference S (g / kg) × air volume (m 3 / h)×air density (kg / m 3 )÷1000.

[0077] According to the target humidity H and the preset multiple humidity intervals, the humidity interval in which the target humidity is located is determined; the upper limit value H of the humidity interval to which the target humidity H belongs is used. X Calculate the amount of condensate generated by the heat exchanger; calculate the operating time of the drain pump based on the amount of condensate generated.

[0078] Specifically, the target humidity H of the outdoor air can be obtained according to the outdoor air humidity sensor, and the humidity range in which the target humidity H is located can be determined by comparing the target humidity H with a preset humidity range.

[0079] For example, the minimum value of the humidity statistics is H min , the maximum value is H max , the humidity statistics data is divided into n+1 intervals by n humidity values, that is, [H min , Hn1], (Hn1, Hn2]...(Hn n , H max ].

[0080] When the target humidity H is detected, the interval to which the target humidity H belongs can be determined by sequential comparison, that is, whether H≤Hn1 is established. If so, then H∈[Hm in , Hn1] interval, H X=Hn1; if not, then continue to judge whether H≤Hn2 is true. If so, then H∈(Hn1, Hn2], H X =Hn2; if not, continue to judge whether H≤Hn3 is true, and so on.

[0081] When H≤Hn1, Hn1 is used to replace H to calculate the amount of condensed water produced. When Hn1≤H≤Hn2, Hn2 is used to replace H to calculate the amount of condensed water produced. When H>Hn n When H max Substitute H to calculate the amount of condensed water produced.

[0082] In this application, the upper limit of the humidity range H X To calculate the amount of condensed water instead of the target humidity H, if the target humidity H does not reach the maximum H X The generation rate of condensed water is relatively slow, and there will still be a short period of idling. However, compared with the existing control method of keeping the drain pump always on, this application has reduced the long running time of the drain pump, greatly reduced the frequency of use of the drain pump, increased its service life, and reduced energy consumption.

[0083] When the humidity value difference is very small, the running time difference of the drainage pump is also very small, and can even be ignored. Therefore, this application uses the upper limit value H of the humidity range as the reference value. X Calculation is more reasonable.

[0084] In some embodiments of the present application, the operating power of the drain pump under the current target humidity H can be obtained based on the condensate generation P of the heat exchanger and the performance parameters of the drain pump. The performance parameters of the drain pump include a one-to-one correspondence between power and drainage parameter A.

[0085] After calculating the condensate generation amount P, compare the condensate generation amount P with the drainage volume A of the drainage pump to obtain a numerical range of the drainage volume A that is greater than the condensate generation amount P, and control the drainage pump to operate at a power corresponding to the minimum value in the numerical range.

[0086] For example, the drainage pump has three gears, each corresponding to a power and displacement parameter A. In the low gear, the power value W1 is the lowest and the displacement A1 is the smallest; in the medium gear, the power value W2 is the lowest and the displacement A2 is the smallest; in the high gear, the power value W3 is the highest and the displacement A3 is the largest.

[0087] Compare the sizes of P and A1. If A1 is greater than P, control the drainage pump to run at low-speed power W1; if A1≤P<A2, control the drainage pump to run at medium-speed power W2; if P≥A2, control the drainage pump to run at high-speed power W3.

[0088] In the above embodiment, a three-speed adjustable drainage pump is used as an example for description. However, the present application is also applicable to drainage pumps with more adjustable gears and even stepless variable frequency water pumps. For stepless variable frequency water pumps, the drainage volume A of the drainage pump = P + preset threshold.

[0089] Determining the operating power of the drain pump according to the condensate generation amount P can make the drainage speed of the drain pump greater than the condensate generation speed, thereby ensuring that the drain pump can drain the condensate.

[0090] In other embodiments, since the larger the target humidity value, the larger the condensate generated P, and the greater the required drainage pump power, the present application can also directly preset the correspondence between the humidity range and the drainage pump power in the storage.

[0091] The preset humidity ranges include: [H min , Hn1], (Hn1, Hn2]……(Hn n , H max ], first calculate the corresponding condensed water generation amount Pn with the upper limit value of each humidity interval, and then obtain the drainage pump power corresponding to each humidity interval by comparing Pn and the drainage parameter A; finally, store the corresponding relationship between the humidity interval and the drainage pump in the storage.

[0092] Specifically, when the target humidity is less than the third humidity value, the drainage pump is adjusted to the first gear D1 when operating; when the target humidity is not less than the third humidity value and less than the fourth humidity value, the drainage pump is adjusted to the second gear D2 when operating; and so on.

[0093] When the target humidity is relatively low, the rate of condensation water generation will be very slow. When the water level reaches the trigger position of the float switch, there will be no risk of condensation water overflowing the water tray even after a period of time. Therefore, in this embodiment, the safety water volume L is set. s , in order to ensure safety, L s Specifically, it can be the maximum water storage capacity of the water tray L max 80% of.

[0094] Therefore, in some embodiments of the present application, reference Figure 4 When the target humidity is H≤H1, when the float switch is turned on, the float switch opening time T is started. on Timing is performed, and the drainage pump does not work until the float switch opens for time T on ≥T s When the drain pump is turned on, the water level in the water tray will drop as the condensed water is discharged. When the water level drops below the trigger level L0 of the float switch, the float switch changes from on to off. After the float switch is off, the drain pump is controlled to continue running for T1 time.

[0095] Among them, T s According to H x and safe water volume L s The calculated safe time for water to remain after the float switch is triggered; T1 is based on H X The drain pump continues running time calculated based on the trigger water level L0.

[0096] Specifically, T s =(L s -L0)÷P1; T1=L0÷(A1-P1); according to H x The humidity difference S1 can be obtained, and the condensed water generation amount P1 of the heat exchanger can be further calculated based on the humidity difference S1; A1 represents the drainage parameter of the drainage pump under the current operating power.

[0097] In this application, when the target humidity is low, after the float switch is turned on, the drain pump does not work immediately, but continues to store water in the water tray. s It can be restarted after a certain time, which reduces the operating cycle of the drain pump while ensuring that the condensate does not overflow.

[0098] In some embodiments of the present application, when the target humidity H is greater than the first preset humidity value H1 and not greater than the second preset humidity value H2, that is, H1<H≤H2, the drainage pump is controlled to start and run for T2 time after the float switch is activated. Wherein, T2 is the upper limit value H of the humidity range to which H belongs. x And the running time of the drainage pump calculated based on the trigger water level L0.

[0099] Specifically, T2=L0÷(A2-P2); according to H x The humidity difference S2 can be obtained, and the condensed water generation amount P2 of the heat exchanger can be further calculated based on the humidity difference S2; A2 represents the drainage parameter under the current operating power of the drainage pump.

[0100] In some embodiments of the present application, when the target humidity H is greater than the second preset humidity value H2, that is, when H>H2, the fan speed is reduced after the float switch is activated, and the drainage pump is controlled to start and run for T3 time. T3 is the upper limit value H of the humidity range to which H belongs. x And the running time of the drainage pump calculated based on the trigger water level L0.

[0101] Specifically, T3 = L0 ÷ (A3 - P max ); according to H x The humidity difference S3 can be obtained, and the condensed water generation amount P3 of the heat exchanger can be further calculated based on the humidity difference S3; A3 represents the drainage capacity parameter under the current operating power of the drainage pump.

[0102] When the target humidity is relatively high, condensate will be generated very quickly. Due to the operation of the fresh air fan and the exhaust fan in the device, the negative pressure inside the device is relatively large, which will affect the discharge of condensate. The load and power consumption of the drainage pump may increase. Therefore, when H>H2 is detected, the fan speed can be reduced first to reduce the negative pressure in the device.

[0103] In this application, when the humidity is relatively high, the float switch is triggered to reduce the speed of the fan, thereby reducing the impact of the negative pressure inside the machine on the discharge of condensed water and reducing the load and power consumption of the water pump.

[0104] In the related art, if the float switch is triggered and does not disconnect for a period of time, it means that the water level in the water receiving tray has not dropped to the trigger water level L0 of the float switch. At this time, it will be determined that the drainage pump is abnormal and an alarm will be shut down. However, in this application, if the negative pressure in the machine increases, it will also cause drainage difficulties. In addition, in the control of this application, when the target air humidity H is low, the float switch will be triggered within the safety time T. s Then turn on the drainage pump, therefore, this alarm mode is not applicable to this application.

[0105] In some embodiments of the present application, when the float opening time T is greater than the first preset time T k , that is, T>T k When the float opening time T is greater than the second preset time T max When the drain pump is judged to be abnormal, an alarm signal is issued and the pump is shut down.

[0106] It should be noted that when the float switch turns on T k 、T max Within a certain period of time, under different humidity ranges, the condensed water will not overflow the water tray.

[0107] When the float switch is turned on, T is greater than T k When the drain pump is running at high power, the operating power of the drain pump is increased and the speed of the fan is reduced. In this way, if the drainage abnormality is caused by the negative pressure inside the machine, the condensed water will be discharged smoothly when the fan speed is reduced and the drain pump is running at high power. As a result, the float switch will be disconnected when the condensed water in the water receiving tray drops to the trigger water level L0; however, if the float opening time T is greater than the second preset time T max When the float switch is still not disconnected, it means that the drainage difficulty is not caused by the negative pressure inside the machine. It is determined that the drainage pump is abnormal and the alarm is shut down.

[0108] If the device shuts down automatically or unexpectedly due to an alarm, power outage, etc., a certain amount of water will remain in the water tray and cannot be discharged from the device. To solve this problem, this application also discloses a control method to prevent water accumulation during shutdown.

[0109] In one application scenario, refer to Figure 5The external drain pipe at the outlet of the drain pump belongs to the downward drainage mode. When the device is shut down, the drain pump automatically adjusts to the passage mode, that is, directly opens the internal flow path, so that the water in the water receiving tray will be naturally discharged along the external drain pipe 23.

[0110] In another application scenario, refer to Figure 6 The external drain pipe 23 at the outlet of the drain pump 22 is connected to the ceiling to drain water. In this case, the water cannot be drained naturally. In this scenario, a rechargeable external water pump 24 is connected to the external drain pipe 23. When the device shuts down, it determines whether it is shut down due to the alarm of the float switch, or due to manual shutdown or power outage due to external factors. If the shutdown is due to the alarm, it means that there is a large amount of water in the water tray and the external water pump needs to be operated. m Time, T m = Maximum water storage capacity of the water tray / flow rate of the external water pump;

[0111] If it is due to active shutdown or external power failure, it means that the water volume in the water tray has not reached the alarm limit, and the external water pump is running. n That's it, T n = Maximum water volume that can trigger the drainage pump to start running / external water pump flow rate.

[0112] Specifically, when the device is shut down, it is determined whether an external water pump is connected. If not, the drainage pump is controlled to be adjusted to the passage mode.

[0113] If there is an external water pump and the float switch alarms when the machine is shut down, the external water pump will run for the preset time T m .

[0114] If there is an external water pump and there is no alarm when the machine is shut down, the external water pump will start running when the target humidity H meets the following conditions: H≤H1. n1 When the target humidity is H>H1, the external water pump runs for T n2 Duration.

[0115] Among them, T n1 =L s / A 外 , T n2 =L0 / A 外 , A 外 The flow rate of the external water pump.

[0116] In another embodiment, the air handling device is an air conditioner, and the air passing through the heat exchanger is indoor air. Therefore, in this embodiment, unlike the above-mentioned fresh air humidifier, the humidity of the indoor air at the air inlet of the air conditioner is the target humidity; the humidity difference S can be calculated by the upper limit value of the humidity range of the target humidity and the air humidity at the air supply point of the air conditioner, and then the condensation water generation amount P can be obtained.

[0117] In this application, the condensation water situation in the device is judged by the air humidity to calculate the operating time of the drainage pump, which reduces the frequency of use of the drainage pump while meeting the drainage requirements, increases the service life of the drainage pump, and reduces the energy consumption of the device.

[0118] In this application, the upper limit value of the humidity range is used instead of the target humidity H to calculate the amount of condensed water. If the target humidity H does not reach the highest, the generation rate of condensed water is relatively slow, and short-term idling will still occur. However, compared with the existing control method of keeping the drainage pump always open, this application has reduced the drainage pump's long running time; when the humidity value difference is very small, the running time of the drainage pump is also very small, and can even be ignored. Therefore, this application is more reasonable to calculate based on the upper limit value of the humidity range.

[0119] In this application, when the target humidity is low (H≤H1), after the float switch is turned on, the drainage pump does not work immediately, but continues to store water in the water tray. s It can be restarted after a certain period of time, which reduces the operating cycle of the water pump while ensuring that the condensate does not overflow.

[0120] In this application, when the humidity is relatively high, the fan speed is reduced after the float switch is triggered, which can reduce the impact of the negative pressure inside the machine on the discharge of condensate, ensure the smooth discharge of condensate, and reduce the load and power consumption of the drainage pump.

[0121] In this application, when the float switch opening time is abnormal, the fan speed is first reduced to discharge the drainage difficulty caused by the internal negative pressure, and then the alarm is stopped to avoid the occurrence of false alarms and shutdowns.

[0122] In the present application, an external water pump connected to the drainage pump is provided, so that when the device is shut down, the water stored in the water receiving tray can be drained by the external water pump.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0124] For ease of explanation, the above description has been presented in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments have been selected and described to better explain the principles and practical applications, thereby enabling those skilled in the art to better utilize the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A control method for an air treatment device, characterized in that: The air treatment device comprises: case; A fan, disposed in the housing, for driving air flow; a heat exchanger for exchanging heat with the air passing therethrough; A water receiving tray, arranged below the heat exchanger, for collecting condensed water generated by the heat exchanger; A float switch is disposed in the water receiving tray, the float switch is turned on when the water level in the water receiving tray reaches a preset trigger water level, and is turned off when the water level is lower than the preset trigger water level; A drainage pump connected to the water receiving pan and used to pump condensed water; The air delivered to the room by the air handling device is taken as the target air, and the target air humidity on the windward side of the heat exchanger is taken as the target humidity; The control method comprises: Get target humidity; The humidity interval of the target humidity is determined according to the target humidity and multiple preset humidity intervals; the condensate generation of the heat exchanger is calculated according to the upper limit value of the humidity interval of the target humidity; and the operation time of the drain pump is calculated according to the condensate generation.

2. The control method of the air treatment device according to claim 1, characterized in that: When the target humidity is greater than the first preset humidity value and not greater than the second preset humidity value, the drain pump is controlled to operate when the float switch is turned on.

3. The control method of the air treatment device according to claim 1, characterized in that: When the target humidity is not greater than the first preset humidity value, the safe time for the water to continue to be stored after the float switch is turned on is calculated according to the amount of condensed water generated and the preset safe water storage amount; When the float switch is turned on, the drainage pump will not be turned on; when the float switch is turned on, the drainage pump will be controlled to turn on after a safety time.

4. The control method of the air treatment device according to claim 3, characterized in that: Calculate the time T1 that the drain pump continues to run after the float switch is disconnected based on the amount of condensed water generated and the preset trigger water level; When the float switch changes from on to off, the drainage pump is controlled to continue running for T1 time.

5. The control method of the air treatment device according to claim 1, characterized in that: When the target humidity is greater than the second preset humidity value, the fan is controlled to slow down and the drainage pump is started when the float switch is turned on.

6. The control method of the air treatment device according to claim 1, characterized in that: The drainage pump has N gear values ​​corresponding to power and drainage parameters; When the amount of condensed water generated is less than the drainage parameter of the first gear, the power of the drainage pump is determined to be the power of the first gear; When the amount of condensed water generated is not less than the drainage parameter of the first gear and is less than the drainage parameter of the second gear, the power of the drainage pump is determined to be the power of the second gear; and so on, when the amount of condensed water generated is not less than the drainage parameter of the N-1th gear and is less than the drainage parameter of the Nth gear, the power of the drainage pump is determined to be the power of the Nth gear.

7. The control method of the air treatment device according to claim 1, characterized in that: When the float switch is turned on for not less than the first preset time, the power of the drainage pump is increased and the fan speed is reduced; when the float switch is turned on for not less than the second preset time, the drainage pump is determined to be abnormal, an alarm signal is sent and the pump is shut down; wherein the second preset time is greater than the first preset time.

8. An air treatment device, characterized in that: include: case; A fan, disposed in the housing, for driving air flow; a heat exchanger for exchanging heat with the air passing therethrough; A water receiving tray, arranged below the heat exchanger, for collecting condensed water generated by the heat exchanger; A float switch is disposed in the water receiving tray, the float switch is turned on when the water level in the water receiving tray reaches a preset trigger water level, and is turned off when the water level is lower than the preset trigger water level; A drainage pump connected to the water receiving pan and used to pump condensed water; The air delivered to the room by the air handling device is taken as the target air, and the target air humidity on the windward side of the heat exchanger is taken as the target humidity; Also includes: a humidity sensor for detecting the humidity of the target air on the windward side of the heat exchanger; The controller is used to determine the humidity interval of the target humidity based on the target humidity and multiple preset humidity intervals; calculate the condensate generated by the heat exchanger based on the upper limit value of the humidity interval where the target humidity is located; and calculate the operating time of the drainage pump based on the condensate generated.

9. The air treatment device according to claim 8, characterized in that: The housing includes a fresh air duct and an exhaust air duct; The heat exchanger includes a first heat exchanger provided in the fresh air duct and a second heat exchanger provided in the exhaust air duct; The air treatment device further comprises: An adsorption module, comprising a first adsorption module arranged at an air outlet side of the first heat exchanger, and a second adsorption module arranged at an air outlet side of the second heat exchanger; The humidity at the air inlet of the fresh air duct is the target humidity; The controller is used to calculate the amount of condensed water generated based on the humidity of the air outlets at both ends of the fresh air duct and the humidity of the air outlets at both ends of the exhaust air duct, wherein the target humidity is replaced by the upper limit value of the humidity range in which the target humidity is located.

10. The air treatment device according to claim 8, characterized in that: Also includes: an external water pump connected to the drainage pump via an external drainage pipe; The controller is used to: when shutting down or powering off, if there is an abnormal alarm of the float switch, control the external water pump to run for a third preset time; if there is no alarm, control the running time of the external water pump to be less than the third preset time.

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