CN110173853B - Water pump control method, water pump control circuit and air conditioner - Google Patents

Water pump control method, water pump control circuit and air conditioner Download PDF

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Publication number
CN110173853B
CN110173853B CN201910456174.1A CN201910456174A CN110173853B CN 110173853 B CN110173853 B CN 110173853B CN 201910456174 A CN201910456174 A CN 201910456174A CN 110173853 B CN110173853 B CN 110173853B
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water
water pump
air conditioner
liquid level
current
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CN110173853A (en
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王少男
李洪涛
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GD Midea Air Conditioning Equipment Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F24F13/222—Means for preventing condensation or evacuating condensate for evacuating condensate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise

Abstract

The invention discloses an air conditioner, a water pump control method and a water pump control circuit applied to the air conditioner, wherein the air conditioner comprises a water tank for receiving condensed water, a liquid level sensor for detecting the liquid level of the water tank and a water pump for controlling the drainage of the water tank, and the water pump control method comprises the following steps: acquiring the liquid level of a water tank detected by a liquid level sensor within a preset time; determining the condensed water generation rate of the air conditioner in the current running state according to the acquired liquid level of the water tank detected by the liquid level sensor within the current preset time; and adjusting the rotating speed of the water pump according to the condensed water generating rate of the air conditioner in the current running state so as to control the water pump to work at the lowest rotating speed within the rotating speed range which meets the requirement that the water tank does not overflow. The invention reduces the noise of the water pump during the drainage work.

Description

Water pump control method, water pump control circuit and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a water pump control method, a water pump control circuit and an air conditioner.
Background
In the refrigeration process of the air conditioner, a certain amount of condensed water can be generated on the surface of an evaporator in the air due to condensation of water vapor in the air, in order to ensure the comfort of the air conditioner and prevent the indoor unit from leaking water, the condensed water needs to be discharged outdoors in time, the existing drainage mode mainly comprises a natural drainage mode and a water pump for pumping water and draining water, the natural drainage mode can generate great limitation on the structural design of the air conditioner, and the water pump drainage scheme can enable the structural design of the air conditioner to be more flexible.
The existing water pump drainage control method starts a water pump to start full-speed running for drainage after an air conditioner starts refrigeration to generate condensed water, so that the problem of overlarge noise of the air conditioner during running is caused.
Disclosure of Invention
The invention mainly aims to provide a water pump control method, which aims to reduce the noise when a water pump discharges condensed water so as to reduce the noise when an air conditioner operates.
In order to achieve the above object, the present invention provides a water pump control method, which is applied to an air conditioner including a water tank for receiving condensed water, a liquid level sensor for detecting a liquid level of the water tank, and a water pump for controlling water discharge from the water tank, the water pump control method including:
acquiring the liquid level of a water tank detected by a liquid level sensor within a preset time;
determining the condensed water generation rate of the air conditioner in the current running state according to the acquired liquid level of the water tank detected by the liquid level sensor within the current preset time;
and adjusting the rotating speed of the water pump according to the condensed water generating rate of the air conditioner in the current running state so as to control the water pump to work at the lowest rotating speed within the rotating speed range which meets the requirement that the water tank does not overflow.
In an embodiment, the acquiring the liquid level of the water tank detected by the liquid level sensor within a preset time period includes:
and acquiring the liquid level of the condensed water in the water tank detected by the liquid level sensor at least one historical moment within the current preset time and the preset time, and acquiring a current liquid level value and a historical liquid level value detected at least one historical moment.
In an embodiment, the determining the condensed water generation rate of the air conditioner in the current operation state according to the acquired liquid level of the water tank detected by the liquid level sensor within the current preset time comprises:
determining the liquid level variation of condensed water in the water tank between the current time and at least one historical time according to the current liquid level value and at least one historical liquid level value;
and calculating the condensed water generation rate of the water tank in the preset time according to at least one of the liquid level variation, the preset time, the water tank cross-sectional area and a preset formula.
In an embodiment, when the historical time is one, the first preset formula is V1＝{[(Hn-Hn-1)/tn-1]*SWater (W)In which V1For the rate of condensate water production, S, of the air conditioner within the preset time periodWater (W)Is the sectional area of the water tank, HnTo the current level value, Hn-1For historical level values corresponding to historical moments, tn-1The time length between the current time and the corresponding historical time;
when the historical moments are multiple, the first preset formula is V1＝{[(Hn-H1)/t1+(Hn-H2)/t2+(Hn-H3)/t3+…+(Hn-Hn-1)/tn-1]*SWater (W)V (n-1) }, in which V1For the rate of condensate water production, S, of the air conditioner within the preset time periodWater (W)Is the sectional area of the water tank, HnTo the current level value, H1、H2…Hn-1For historical level values corresponding to a plurality of historical moments, t1、t2…tn-1The time length between the current time and each historical time.
In an embodiment, the determining the condensed water generation rate of the air conditioner in the current operation state according to the acquired liquid level of the water tank detected by the liquid level sensor within the current preset time further includes:
and calculating the condensed water generation rate of the water tank within the preset time according to at least one liquid level variable quantity, the time length between the current time and at least one historical time, the sectional area of the water tank, a preset weight value corresponding to the condensed water generation rate between the current time and at least one historical time and a second preset formula.
In an embodiment, when the historical time is one, the second preset formula is V1＝{{[(Hn-Hn-1)*Sn-1/tn-1]/Sn-1}*SWater (W)Wherein, V1For the rate of condensate water production, S, of the air conditioner within the preset time periodWater (W)Is the sectional area of the water tank, HnTo the current level value, Hn-1For historical level values corresponding to historical moments, tn-1Between the current and corresponding historical timeDuration of (S)n-1A preset weight value of the air conditioner condensate water generation rate between the current time and the corresponding historical time;
when the historical time is multiple, the second preset formula is V1＝{{[(Hn-H1)*S1/t1+(Hn-H2)*S2/t2+(Hn-H3)*S3/t3+…+(Hn-Hn-1)*Sn-1/tn-1]/(S1+S2+…+Sn-1)}*SWater (W)V (n-1) }, wherein, V1For the rate of condensate water production, S, of the air conditioner within the preset time periodWater (W)Is the sectional area of the water tank, HnTo the current level value, H1、H2…Hn-1For historical level values corresponding to a plurality of historical moments, t1、t2…tn-1Is the time length between the current time and each historical time, S1、S2…Sn-1The preset weight value is corresponding to the air conditioner condensed water generating rate between the current time and each historical time.
In one embodiment, the "adjusting the rotation speed of the water pump according to the condensed water generating rate of the air conditioner in the current operation state to control the water pump to operate at the lowest rotation speed within the rotation speed range satisfying the condition that the water tank does not overflow" includes:
and determining a water pump rotating speed gear matched with the condensed water generating rate of the air conditioner in the current running state, wherein the drainage rate of the water pump is equal to the condensed water generating rate of the air conditioner under the water pump rotating speed gear.
In one embodiment, the water pump speed Vr ═ V1-b)/k, where V is1K and b are proportionality coefficients of a water pump for a condensate water generation rate of the air conditioner.
In an embodiment, the water pump control method further includes:
and when the air conditioner does not produce condensed water any more according to the production rate, controlling the water pump to drain water at a preset lowest rotating speed.
In an embodiment, after performing the "controlling the water pump to drain at the preset minimum rotation speed when it is determined that the air conditioner does not produce the condensed water any more according to the production rate", the water pump control method further includes:
and when the condensed water in the water tank is determined to be emptied, the water pump is turned off.
In order to achieve the above object, the present invention further provides a water pump control circuit applied to an air conditioner, the air conditioner includes a water tank for receiving condensed water, a liquid level sensor for detecting a liquid level of the water tank, a sensor group for detecting an environmental parameter, and a water pump for controlling water drainage of the water tank, the sensor group at least includes a temperature sensor, a humidity sensor, or a temperature and humidity sensor, and the water pump control circuit includes:
a controller; the controller comprises a memory, a processor and a water pump control program stored on the memory; the controller is electrically connected with the liquid level sensor and the sensor group respectively;
the input end of the driving circuit is connected with the controller, and the output end of the driving circuit is connected with the water pump;
and the water pump control program is executed by the processor to realize the steps of the water pump control method, wherein the processor is used for outputting PWM modulation signals corresponding to the duty ratio according to the condensed water generation rate of the air conditioner in the current running state so as to control the driving circuit to regulate the rotating speed of the water pump.
In one embodiment, the driving circuit includes:
the power supply input end is used for inputting a direct-current power supply;
the input end of the switching tube is connected with the power supply input end, and the controlled end of the switching tube is connected with the output end of the controller;
one end of the inductor is connected with the switching tube and is used for receiving a pulse width modulation signal of the switching tube and filtering the pulse width modulation signal;
one end of the capacitor is connected with the inductor, and the other end of the capacitor is connected with the water pump and used for filtering the pulse width modulation signal;
and one end of the freewheeling diode is connected with the inductor, the other end of the freewheeling diode is connected with the grounding end, and the freewheeling diode is used for freewheeling on the inductor during the turn-off period of the switching tube.
In addition, the invention also provides an air conditioner comprising the water pump control method or the water pump control circuit, which is specifically referred to above and is not repeated herein.
According to the technical scheme, the liquid level of the water tank detected by the liquid level sensor within the current preset time is obtained; determining the condensed water generation rate of the air conditioner in the current running state according to the acquired liquid level of the water tank detected by the liquid level sensor within the current preset time; and adjusting the rotating speed of the water pump according to the condensed water generating rate of the air conditioner in the current running state so as to control the water pump to work at the lowest rotating speed within the rotating speed range which meets the requirement that the water tank does not overflow. From this, reduced the noise of water pump when satisfying the air conditioner drainage, in addition, can also reduce the wearing and tearing and the energy consumption of water pump.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic view of the principle of liquid level control of a water tank of an air conditioner according to the present invention;
FIG. 2 is a schematic flow chart illustrating a water pump control method according to an embodiment of the present invention;
FIG. 3 is a detailed flowchart of steps S11 and S12 in the water pump control method of the present invention;
FIG. 4 is a schematic diagram of a circuit structure of a water pump control circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of internal functional modules of a controller in the air conditioner according to the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention provides an air conditioner which can be different air conditioner equipment such as a wall-mounted air conditioner, a vertical air conditioner and the like. Referring to fig. 1, in an embodiment, the air conditioner includes a water storage tank 500 for receiving condensed water, a liquid level sensor 100 for detecting a liquid level of the water storage tank, a water pump 400 for controlling a water discharge of the water storage tank 500, a controller 200, and a driving circuit 300 connected to and controlled by the controller 200, in an exemplary technique, the water pump is controlled to discharge water by starting the water pump to operate at full speed when the air conditioner starts to refrigerate to generate condensed water, which may cause excessive noise during operation of the air conditioner, shortened life of the water pump, and waste of electric energy, which may affect an indoor environment, resulting in poor user experience.
In order to solve the above problem, the present invention provides a water pump control method, and referring to fig. 2, the water pump control method includes:
step S11, acquiring the liquid level of the water tank detected by the liquid level sensor within the current preset time;
the liquid level sensor is a sensor instrument for measuring the water level height of the liquid level and the water volume of the water tank, and can be a capacitance sensor, a reed pipe liquid level detection sensor or a floater liquid level detection sensor so as to realize the detection of the liquid level, and can also be other liquid level sensors without limitation. The liquid level sensor can detect the liquid level of the water tank in real time or at regular time, and after the detection, the detected liquid level result is stored by the corresponding controller of the air conditioner electric control device, so that the condensed water generation rate of the water tank within a certain time range can be calculated conveniently. It should be noted that the preset duration is a preset duration set by the system, and may be 2min, 5min, 10min or other durations, and may be configured according to needs or experience.
Step S12, determining the condensed water generating rate of the air conditioner in the current running state according to the acquired liquid level of the water tank detected by the liquid level sensor within the current preset time;
in this embodiment, the calculation may be performed according to the liquid level detected at one current historical time, or may be performed according to the liquid levels detected at a plurality of current historical times. Wherein, the time length from the current preset time length is the time length from the current to the historical time, and the time length from the current historical time can be a plurality of t1、t2... or tnThe liquid level of the water tank detected by the liquid level sensor within the preset time can be H1、H2…HnThe current operation state refers to that the air conditioner operates according to current operation state parameters, and the condensed water generation rate is the condensed water generation rate obtained by calculating the amount of the condensed water generated in the preset time length and the preset time length.
And step S13, adjusting the rotating speed of the water pump according to the condensed water generating rate of the air conditioner in the current running state so as to control the water pump to work at the lowest rotating speed within the rotating speed range which meets the requirement that the water tank does not overflow.
In this embodiment, the method for adjusting the rotation speed of the water pump is not limited, and for example, the rotation speed gears that change step by step may be switched to adjust the speed of the water pump, or the speed that increases or decreases the corresponding magnitude at the initial speed may be increased or decreased at each time to adjust the speed of the water pump, or the fixed speed value may be increased or decreased at each time to adjust the speed of the water pump. Wherein the lowest rotating speed V of the water pump2The lowest rotating speed V of the water pump can be obtained through a program according to the type of the water pump2Rotation speed of water pump and condensate water generation rate V1Positive correlation is carried out, and the rotating speed of the water pump is correspondingly adjusted according to the condensate water generation rate so as to ensure that the rotating speed of the water pump is relatively low under the condition that the water tank does not overflow and reduce noise. Wherein, the rotating speed range of the water tank not overflowing is an interval, in the interval, the water discharge rate of the water pump is larger than or equal to the condensed water generation rate of the air conditioner, wherein, the lowest rotating speed V2The minimum value of the interval is the rotating speed of the water pump corresponding to the drainage rate of the water pump equal to the condensed water generation rate of the air conditioner, and the rotating speed is adopted to control the water pump to drain water, so that the rotating speed of the water pump is the lowest under the condition that the water tank does not overflow, and the water tank is ensured to be not overflowedNoise is reduced as much as possible. Certainly, if the water level of the water tank is lower than the preset low water level value, the water pump can be directly controlled to drain water at the preset lowest rotating speed so as to reduce noise, and when the water level exceeds the preset low water level, the water pump is controlled to be started at the maximum rotating speed to empty condensed water stored in the water tank in a short time, so that the water pump can be ensured to work in a low noise state for a long time under the condition of sacrificing a low noise state for a short part of time.
In this embodiment, when the air conditioner is in operation, condensed water is generated, the condensed water flows into the water storage tank 500 first, the liquid level sensor 100 measures a plurality of liquid levels of the condensed water generated by the air conditioner within one or more preset time periods, the plurality of liquid levels are compared with the current liquid level, so as to determine the liquid level variation, and transmit the liquid level variation data to the controller 200, the controller 200 determines the condensed water generation rate of the air conditioner in the current operation state according to the acquired liquid level of the water tank detected by the liquid level sensor within the current preset time, further regulating the rotating speed of the water pump according to the condensed water generating rate of the air conditioner in the current running state, so as to control the water pump to work at the lowest rotating speed within the rotating speed range which meets the requirement that the water tank does not overflow, so as to carry out drainage treatment, the operating noise of the water pump 400 is reduced while satisfying the drainage of the air conditioner, since the water pump is rotated at the lowest rotation speed V for a long time.2The water pump is used for draining water, so that the noise is reduced, the abrasion of the water pump is low, and the energy consumption in unit time is relatively low.
In an embodiment, the step S11 of acquiring the liquid level of the water tank detected by the liquid level sensor within a preset time period includes:
step S101, acquiring the liquid level of the condensed water in the water tank detected by the liquid level sensor at least at one historical moment at present and within a preset time from the present, and acquiring a present liquid level value and a historical liquid level value detected at least at one historical moment from the present.
In this embodiment, the current liquid level detected by the liquid level sensor is HnThe level of the condensed water in the water tank detected by the level sensor at least one historical moment comprises H1、H2、H3、H4....Hn-1Introduction of said H1、H2、H3、H4....Hn-1The liquid level data of (2) are transmitted into a controller, and the controller stores the liquid level data in a value mode according to the liquid level data.
The controller can acquire the liquid level data detected by the liquid level sensor in real time and store the liquid level data. And the controller controls the water pump according to a preset control period or after each liquid level detection data is obtained. For example, when the currently detected liquid level is acquired, the liquid level detected at one historical time or a plurality of liquid levels detected at a plurality of historical times within a preset time period may be acquired. It should be noted that, when the acquired liquid level is detected at one historical time, the preset time length is correspondingly equal to the time length from the current time to the corresponding historical time, and when the historical time lengths are multiple, the preset time length is the time length from the current longest historical time length. In the embodiment, the liquid level of the condensed water in the water tank, which is detected by the liquid level sensors at a current preset time and at a historical time within a preset time, is adopted to analyze and calculate the condensed water generation rate of the air conditioner in the current running state, and the liquid level data detected at a plurality of historical times are adopted, so that the analysis is more accurate and the precision is higher.
In this embodiment, further, the step S12 of determining the condensed water generating rate of the air conditioner in the current operating state according to the acquired liquid level of the water tank detected by the liquid level sensor within the current preset time period includes:
s102, determining the liquid level variation of the condensed water in the water tank between the current time and at least one historical time according to the current liquid level value and at least one historical liquid level value;
and S103, calculating the condensed water generation rate of the water tank within the preset time according to at least one liquid level variable quantity, the time length between the current time and each historical time, the cross-sectional area of the water tank and a preset formula.
In this embodiment, when the historical time is one, the first preset formula is V1＝{[(Hn-Hn-1)/tn-1]*SWater (W)In which V1For the rate of condensate water production, S, of the air conditioner within the preset time periodWater (W)Is the sectional area of the water tank, HnTo the current level value, Hn-1For historical level values corresponding to historical moments, tn-1Is the time duration between the current and corresponding historical time.
When the historical moments are multiple, the first preset formula is V1＝{[(Hn-H1)/t1+(Hn-H2)/t2+(Hn-H3)/t3+…+(Hn-Hn-1)/tn-1]*SWater (W)V (n-1) }, in which V1For the rate of condensate water production, S, of the air conditioner within the preset time periodWater (W)Is the sectional area of the water tank, HnTo the current level value, H1、H2…Hn-1For historical level values corresponding to a plurality of historical moments, t1、t2…tn-1The time length between the current time and each historical time.
In this embodiment, by using the formula, the liquid level variation, the duration between the current time and at least one historical time, and the sectional area of the water tank are substituted into the formula, so that the condensed water generation rate can be obtained. It should be noted that in the formula, by calculating a ratio of the liquid level variation to the time length between the current time and each historical time, the liquid level variation rate can be calculated, and the liquid level variation rate is multiplied by the sectional area of the water tank to obtain the condensed water generation rate of the condensed water within the preset time length. The condensed water in the water tank is directly analyzed, and the condensed water generation rate of the air conditioner can be relatively accurately calculated.
In an embodiment, the step S12 of determining the condensed water generating rate of the air conditioner in the current operating state according to the acquired liquid level of the water tank detected by the liquid level sensor within the preset time period includes:
and calculating the condensed water generation rate of the water tank in the time length between the current time and each historical time according to at least one liquid level variable quantity, the time length between the current time and each historical time, the sectional area of the water tank, a preset weight value corresponding to the condensed water generation rate between the current time and at least one historical time and a second preset formula.
In practical application, the air conditioner condensate water generation rate has deviation under the same external conditions, for example, a humidity environment, different types of air conditioners are different, so that a preset weight value of the condensate water generation rate is related to a specific air conditioner type, the test and determination are performed according to the condensate water generation rate test of the air conditioners of different types within corresponding time, the test precision can be improved through multiple performance experiments, after the test is completed, corresponding configuration is performed according to the time length, and when the water pump control method is operated, the corresponding weight value is matched according to the current time length and the historical time length. For example, S1Is corresponding to the current and t1Preset weight value of air conditioner condensate water generation rate between moments, S2Is corresponding to the current and t2The preset weight value of the condensed water generating rate of the air conditioner between the moments, and so on, Sn-1To correspond to the current and tn-1The preset weight value of the air conditioner condensate water generation rate between moments.
In this embodiment, when the historical time is one, the second preset formula is V1＝{{[(Hn-Hn-1)*Sn-1/tn-1]/Sn-1}*SWater (W)Wherein, V1For the rate of condensate water production, S, of the air conditioner within the preset time periodWater (W)Is the sectional area of the water tank, HnTo the current level value, Hn-1For historical level values corresponding to historical moments, tn-1Is the time length between the current and the corresponding historical time, Sn-1A preset weight value of the air conditioner condensate water generation rate between the current time and the corresponding historical time;
when the historical time is multiple, the second preset formula is V1＝{{[(Hn-H1)*S1/t1+(Hn-H2)*S2/t2+(Hn-H3)*S3/t3+…+(Hn-Hn-1)*Sn-1/tn-1]/(S1+S2+…+Sn-1)}*SWater (W)V (n-1) }, wherein, among them，V1For the rate of condensate water production, S, of the air conditioner within the preset time periodWater (W)Is the sectional area of the water tank, HnTo the current level value, H1、H2…Hn-1For historical level values corresponding to a plurality of historical moments, t1、t2…tn-1Is the time length between the current time and each historical time, S1、S2…Sn-1The preset weight value is corresponding to the air conditioner condensed water generating rate between the current time and each historical time.
It should be noted that, in the formula, by calculating a ratio of a liquid level variation to a preset time length between the current time and each historical time, a liquid level variation rate can be calculated, and the liquid level variation rate is multiplied by a sectional area of the water tank to obtain a condensed water generation rate of condensed water within a preset time length, and the condensed water generation rate is further calculated according to a preset weight value corresponding to the condensed water generation rate between the current time and at least one historical time to obtain a condensed water generation rate with higher precision.
Further, in an embodiment, the step S13 of adjusting the rotation speed of the water pump according to the condensed water generating rate of the air conditioner in the current operation state, so as to control the water pump to operate at the lowest rotation speed within the rotation speed range that the water tank does not overflow includes:
and determining a water pump rotating speed gear matched with the condensed water generating rate of the air conditioner in the current running state, wherein the drainage rate of the water pump is equal to the condensed water generating rate of the air conditioner under the water pump rotating speed gear.
In the specific implementation process of the embodiment, the controller calculates the condensed water generation rate V of the air conditioner in the current operation state1Then, it is possible to generate the rate V according to the rate1Searching and said V inside the program1The matched water pump rotating speed gear is used for outputting a control instruction so as to control the water pump to operate according to the water pump rotating speed gear, and the water pump rotating speed gear is the lowest rotating speed V required by the water pump while ensuring that the water tank does not overflow2At the lowest speed V of the water pump2When in operation, the water pump has a drainage rate equal to the condensation rate of the air conditionerThe rate of water production is such that the tank level is maintained balanced with minimal noise. Of course, if it is desired to control the water level down, the speed may be slightly increased, i.e. the operation in the previous gear of this gear may be used.
In this embodiment, the pump speed Vr ═ V (V)1-b)/k, wherein V1K and b are proportionality coefficients of a water pump for a condensate water generation rate of the air conditioner. The water pump of every type has different proportionality coefficients, can specifically confirm according to the model of water pump, consequently, in order to guarantee the accuracy that the gear set up, can set up the corresponding water pump rotational speed gear according to the comdenstion water production rate of air conditioner and the proportionality coefficient of water pump, when avoiding the air conditioner to adopt the water pump of different grade type, the problem that the control accuracy is influenced to the water pump rotational speed gear that the air conditioner actually set up and water pump drainage rate are inconsistent.
Further, after the step S13 of determining the condensed water generation rate of the air conditioner in the current operation state according to the acquired liquid level of the water tank detected by the liquid level sensor within the current preset time, the water pump control method further includes:
when the air conditioner does not produce the condensed water any more according to the condensed water producing speed V1 of the air conditioner, the water pump is controlled to rotate at the preset lowest rotating speed V3And draining water.
In the present embodiment, the preset minimum rotation speed V3The minimum rotation speed V2May be the same preset value or less than the minimum rotating speed V2。
Wherein when based on the generation rate V1The condition that the air conditioner does not produce condensed water any more is determined, when the condensed water production rate is infinitely close to or equal to 0, the condition that the air conditioner internal unit does not produce the condensed water any more is determined, and then the water pump is controlled to rotate at the preset lowest rotating speed V3And draining water. Of course, it may also be determined that no condensed water is generated by other methods, for example, when the controller obtains that the current air conditioner operation condition is a heating mode, an air supply mode or the current environment temperature is lower than the evaporator temperature, the controller judges that no condensed water is generated, and controls to drain the water tank at the lowest rotation speed, and if the current air conditioner operation condition is obtained, the controller empties the water tank at the lowest rotation speedAnd when the operation condition is not the condition, judging that the condensed water is continuously generated, detecting the water amount in the water pump within a period of time, and correcting the rotating speed of the water pump. In this embodiment, the preset minimum rotation speed may be set by the user or may be set by default, and in practical application, the minimum rotation speed may be configured according to the working requirement of the water pump, so as to control the water discharge as much as possible by using the minimum rotation speed of the water pump itself, so as to reduce the working noise of the water pump during the water discharge as much as possible.
Further, the step S13 is executed when the generation rate V is based on1When the air conditioner is determined not to generate condensed water any more, the water pump is controlled to rotate at the preset lowest rotating speed V3After the step of draining, the water pump control method further includes:
and when the condensed water in the water tank is determined to be emptied, the water pump is turned off.
In this embodiment, confirm that the evacuation of the comdenstion water in the water tank can be through measuring the water level value of the comdenstion water in the water tank, if the water level value is for being less than predetermined low water level value or for 0, then confirm that the comdenstion water in the water tank has been evacuated, and then the controller control water pump motor is closed to close the water pump in service, so, can prevent that the water pump from taking out and producing very big noise, avoid taking out moreover to make the water pump overheat and damage.
Based on the air conditioner, in order to reduce the problem of the water pump drainage noise, the invention further provides a water pump control circuit, which, in an embodiment, with reference to fig. 4 to 5, includes:
a controller 10; the controller comprises a memory 1000, a processor 2000 and a water pump control program stored on the memory 1000; the input end of the driving circuit 20 is connected with the controller 10, and the output end of the driving circuit 20 is connected with the water pump;
the memory 1000 may be a high-speed RAM memory or a stable memory such as a disk memory. The memory 1000 is communicatively coupled to the processor 2000 via a bus.
The water pump control program is executed by the processor to realize the water pumpThe steps of the control method, the specific implementation and the principle of the steps of the water pump control method refer to the implementation, and the steps have the same effect as the method, and are not repeated herein. Wherein the processor is used for generating a condensed water generating rate V according to the current operation state of the air conditioner1And outputting a PWM modulation signal corresponding to the duty ratio to drive the driving circuit 20 to adjust the rotation speed of the water pump.
In one embodiment, the driving circuit 20 includes:
a power input terminal Vcc for inputting a DC power supply;
a switch tube Q1, wherein the input end of the switch tube Q1 is connected with the power supply input end Vcc, and the controlled end of the switch tube Q1 is connected with the output end of the controller;
one end of the inductor L1, one end of the inductor L1 is connected to the switching tube Q1, and is configured to receive the pulse width modulation signal of the switching tube Q1 and filter the pulse width modulation signal;
one end of the capacitor C1 is connected with the inductor L1, and the other end of the capacitor C1 is connected with the water pump B1 and used for filtering the pulse width modulation signal;
and a freewheeling diode D1, in which one end of the freewheeling diode D1 is connected to the inductor L1, and the other end is connected to the ground GND, and the freewheeling diode D1 is used for freewheeling to the inductor L1 during the off period of the switching tube Q1.
In this embodiment, the controller 10 may be a programmable logic controller, a microprocessor, or a single chip, and the controller outputs a PWM (Pulse Width Modulation) signal, where the Pulse Width Modulation is an analog control manner, and modulates the bias of the transistor base or the MOS transistor gate according to the change of the corresponding load to change the conduction time of the transistor or the MOS transistor, so as to change the output of the switching regulator. In this embodiment, the controller outputs a pulse width modulation signal to the gate of the switching tube Q1 to control the energy of the LC oscillating circuit and the voltages at both ends, thereby controlling the voltages at both ends of the water pump dc motor, and the freewheeling diode D1 connected to the switching tube Q1 freewheels the inductor L1 during the off period of the switching tube Q1, wherein the switching tube Q1 may be a field effect transistor, and the LC oscillating circuit performs a filtering function to smooth the voltages at both ends of the water pump B1 motor. Because the controller 10 outputs the pulse width modulation signal to control the input voltage of the direct current motor, the low-rotation-speed soft start is realized when the water pump B1 is started, and the starting noise is reduced. In the running process of the water pump, the controller 10 can intelligently control the input voltage of the water pump motor according to the required water displacement so as to control the rotating speed and the displacement of the water pump and reduce the running noise and the power consumption required by running.
Specifically, in the operation process, the rotating speed of the motor can be flexibly controlled, the air conditioner operates at full speed when the condensed water is more, and operates at a reduced speed when the condensed water is less, so that the noise and the power consumption are reduced.
In this embodiment, in the control circuit, the voltage Vo across the water pump motor is Vcc D, where D is the duty ratio of the pwm signal wave. The duty ratio refers to the proportion of the electrifying time relative to the total time in a pulse cycle, Vcc is the voltage value at two ends of the controller, and Vo is the voltage at two ends of the water pump.
In this embodiment, the inductor L1 and the capacitor C1 are used for filtering to smooth the voltage across the water pump motor.
In this embodiment, the controller 10 intelligently controls the input voltage across the water pump motor according to the amount of water to be discharged to control the minimum speed of the water pump.
In addition, it should be noted that, since the air conditioner provided by the present invention includes the water pump control method or the water pump control circuit, the air conditioner at least has the same embodiments and technical effects as the water pump control method or the water pump control circuit, and specific reference may be made to the implementation, and details are not described here.

Claims (12)

1. A water pump control method is applied to an air conditioner, the air conditioner comprises a water tank for receiving condensed water, a liquid level sensor for detecting the liquid level of the water tank and a water pump for controlling the water drainage of the water tank, and the water pump control method is characterized by comprising the following steps:
acquiring the liquid level of a water tank detected by a liquid level sensor within a preset time;
determining the condensed water generation rate of the air conditioner in the current running state according to the acquired liquid level of the water tank detected by the liquid level sensor within the current preset time;
adjusting the rotating speed of a water pump according to the condensed water generating rate of the air conditioner in the current running state so as to control the water pump to work at the lowest rotating speed within the rotating speed range which meets the requirement that the water tank does not overflow;
wherein, the adjusting the rotating speed of the water pump according to the condensed water generating rate of the air conditioner in the current running state to control the lowest rotating speed of the water pump in the rotating speed range meeting the requirement that the water tank does not overflow comprises:
and determining a water pump rotating speed gear matched with the condensed water generating rate of the air conditioner in the current running state, wherein the drainage rate of the water pump is equal to the condensed water generating rate of the air conditioner under the water pump rotating speed gear.
2. The water pump control method according to claim 1, wherein the acquiring the liquid level of the water tank detected by the liquid level sensor within a preset time period comprises:
and acquiring the liquid level of the condensed water in the water tank detected by the liquid level sensor at least one historical moment within the current preset time and the preset time, and acquiring a current liquid level value and a historical liquid level value detected at least one historical moment.
3. The water pump control method according to claim 2, wherein the determining of the condensed water generation rate of the air conditioner in the current operation state according to the acquired liquid level of the water tank detected by the liquid level sensor within the current preset time period comprises:
determining the liquid level variation of condensed water in the water tank between the current time and at least one historical time according to the current liquid level value and at least one historical liquid level value;
and calculating the condensed water generation rate of the air conditioner within the preset time according to at least one liquid level variation, the time length between the current time and at least one historical time, the water tank cross-sectional area and a first preset formula.
4. The water pump control method according to claim 3,
when the historical time is one, the first preset formula is V1＝{[(Hn-Hn-1)/tn-1]*SWater (W)In which V1For the rate of condensate water production, S, of the air conditioner within the preset time periodWater (W)Is the sectional area of the water tank, HnTo the current level value, Hn-1For historical level values corresponding to historical moments, tn-1The time length between the current time and the corresponding historical time;
when the historical moments are multiple, the first preset formula is V1＝{[(Hn-H1)/t1+(Hn-H2)/t2+(Hn-H3)/t3+…+(Hn-Hn-1)/tn-1]*SWater (W)V (n-1) }, in which V1For the rate of condensate water production, S, of the air conditioner within the preset time periodWater (W)Is the sectional area of the water tank, HnTo the current level value, H1、H2…Hn-1For historical level values corresponding to a plurality of historical moments, t1、t2…tn-1The time length between the current time and each historical time.
5. The water pump control method according to claim 3, wherein the determining of the condensed water generation rate of the air conditioner in the current operation state according to the acquired liquid level of the water tank detected by the liquid level sensor within the current preset time period comprises:
and calculating the condensed water generation rate of the air conditioner within the preset time according to at least one liquid level variable quantity, the time length between the current time and at least one historical time, the sectional area of the water tank, a preset weight value corresponding to the condensed water generation rate of the air conditioner between the current time and at least one historical time and a second preset formula.
6. The water pump control method according to claim 5,
when the historical time is one, the second preset formula is V1＝{{[(Hn-Hn-1)*Sn-1/tn-1]/Sn-1}*SWater (W)Wherein, V1For the rate of condensate water production, S, of the air conditioner within the preset time periodWater (W)Is the sectional area of the water tank, HnTo the current level value, Hn-1For historical level values corresponding to historical moments, tn-1Is the time length between the current and the corresponding historical time, Sn-1A preset weight value of the air conditioner condensate water generation rate between the current time and the corresponding historical time;
when the historical time is multiple, the second preset formula is V1＝{{[(Hn-H1)*S1/t1+(Hn-H2)*S2/t2+(Hn-H3)*S3/t3+…+(Hn-Hn-1)*Sn-1/tn-1]/(S1+S2+…+Sn-1)}*SWater (W)V (n-1) }, wherein, V1For the rate of condensate water production, S, of the air conditioner within the preset time periodWater (W)Is the sectional area of the water tank, HnTo the current level value, H1、H2…Hn-1For historical level values corresponding to a plurality of historical moments, t1、t2…tn-1Is the time length between the current time and each historical time, S1、S2…Sn-1The preset weight value is corresponding to the air conditioner condensed water generating rate between the current time and each historical time.
7. The water pump control method according to claim 1, wherein the water pump speed Vr ═ V (V)1-b)/k, wherein V1K and b are proportionality coefficients of a water pump for a condensate water generation rate of the air conditioner.
8. The water pump control method according to claim 1, wherein after the step of determining a condensed water generation rate of the air conditioner in the current operation state according to the acquired liquid level of the water tank detected by the liquid level sensor within a current preset time period is performed, the water pump control method further comprises:
and when the air conditioner does not produce the condensed water any more according to the condensed water production rate of the air conditioner, controlling the water pump to drain at the preset lowest rotating speed.
9. The water pump control method according to claim 8, wherein after performing the step of controlling the water pump to drain at a preset minimum rotation speed when it is determined that the air conditioner does not produce condensed water any more according to a condensed water production rate of the air conditioner, the water pump control method further comprises:
and when the condensed water in the water tank is determined to be emptied, the water pump is turned off.
10. The utility model provides a water pump control circuit, is applied to in the air conditioner, this air conditioner including be used for accepting the water tank of comdenstion water, be used for detecting the level sensor of water tank liquid level, be used for detecting environmental parameter's sensor group and right the water tank carries out the water pump of drainage control, sensor group includes temperature sensor, humidity transducer or temperature and humidity sensor at least, its characterized in that, water pump control circuit includes:
a controller; the controller comprises a memory, a processor and a water pump control program stored on the memory; the controller is electrically connected with the liquid level sensor and the sensor group respectively;
the input end of the driving circuit is connected with the controller, and the output end of the driving circuit is connected with the water pump;
the water pump control program is executed by the processor to implement the steps of the water pump control method according to any one of claims 1 to 9, wherein the processor is configured to output a Pulse Width Modulation (PWM) signal corresponding to the duty ratio according to the condensed water generation rate of the air conditioner in the current operation state, so as to control the driving circuit to adjust the rotation speed of the water pump.
11. The water pump control circuit of claim 10, wherein the drive circuit comprises:
the power supply input end is used for inputting a direct-current power supply;
the input end of the switching tube is connected with the power supply input end, and the controlled end of the switching tube is connected with the output end of the controller;
one end of the inductor is connected with the output end of the switch tube;
one end of the capacitor is connected with the other end of the inductor, and the other end of the capacitor is connected with the water pump;
and the cathode of the freewheeling diode is connected with the inductor, and the anode of the freewheeling diode is grounded.
12. An air conditioner characterized by implementing the water pump control method according to any one of claims 1 to 9 or comprising the water pump control circuit according to claim 10 or 11.
CN201910456174.1A 2019-05-28 2019-05-28 Water pump control method, water pump control circuit and air conditioner Active CN110173853B (en)

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