CN114923218B - Air conditioner - Google Patents
Air conditioner Download PDFInfo
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- CN114923218B CN114923218B CN202210318896.2A CN202210318896A CN114923218B CN 114923218 B CN114923218 B CN 114923218B CN 202210318896 A CN202210318896 A CN 202210318896A CN 114923218 B CN114923218 B CN 114923218B
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- drain
- control
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- drainage
- controller
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
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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
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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
- F24F11/62—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
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application discloses an air conditioner, which comprises a compressor, an indoor unit, a water receiving disc, a drainage pump, a water level detection mechanism, a controller and a drainage control mechanism, wherein the drainage control mechanism is configured to comprise: a first drain driving control for driving the drain pump to drain according to an instruction for operating the indoor unit executed by the controller or stopping the drain pump according to an instruction for stopping the indoor unit executed by the controller when the water level detecting means stops outputting the trigger signal; and a second drain driving control for driving the drain pump to drain by ignoring the command of the controller for controlling the indoor unit to work or stop working when the water level detecting mechanism outputs the trigger signal. According to the application, the operation of the drainage pump is linked with the operation of the indoor unit and the actual water accumulation condition through the first drainage driving control and the second drainage driving control, intelligent switching is realized, the effective drainage of the indoor unit is ensured, and peculiar smell, corrosion and bacteria breeding caused by water accumulation are avoided.
Description
Technical Field
The application belongs to the technical field of air conditioning equipment, and particularly relates to an air conditioner.
Background
The indoor unit (also referred to as an indoor unit) of the air conditioner is provided inside with a water tray configured to temporarily store condensed water formed on the surface of the indoor heat exchanger and falling down. The water temporarily stored in the water receiving tray is referred to as "drainage". The drain communicates with the outside of the outdoor unit through a pipe, and discharges the temporarily stored water to the outside. If the drainage is not smooth, condensed water stays in the water receiving disc, and peculiar smell, bacteria breeding or rust may be generated. The indoor unit of the traditional split air conditioner is designed through an installation framework, and condensed water is discharged outdoors from high to low under the action of gravity. However, in a new type of air conditioner (for example, a central air conditioner), the total amount of drain water is large, and a drain pump for forcibly discharging the drain water to the outside is generally provided.
On the other hand, the condensation speed and accumulation speed of condensed water formed on the indoor heat exchanger surface and falling are not linear or constant; in the existing air conditioner, a scheme of driving the drain pump in association with the operation of the air conditioner and the current condensate water accumulation amount is not disclosed to avoid the problem of malfunction of the drain pump and the control circuit.
The information disclosed in this background section is only for enhancement of understanding of the background section of the application and therefore it may not form the prior art that is already known to those of ordinary skill in the art.
Disclosure of Invention
The application provides an air conditioner, which links the operation of a drainage pump with the operation of an indoor unit and the actual water accumulation condition through first drainage driving control and second drainage driving control, and realizes intelligent switching, so that the indoor unit is ensured to effectively drain water, and peculiar smell, rust and bacteria caused by water accumulation are avoided.
In some embodiments of the present application, an air conditioner includes: a compressor configured to compress a refrigerant; an indoor unit; a water receiving tray configured to temporarily store condensed water attached to the indoor unit and falling down; a drain pump configured to drain water in the drain pan; a water level detection mechanism configured to detect a water level in the water pan and output a trigger signal if the actual water level is above a set water level and stop outputting the trigger signal if the actual water level is below the set water level; a controller configured to control an operation or a stop of the indoor unit; a drainage control mechanism configured to include: a first drain driving control for driving the drain pump to drain according to an instruction for operating the indoor unit executed by the controller or stopping the drain pump according to an instruction for stopping the indoor unit executed by the controller when the water level detecting means stops outputting the trigger signal; and a second drain driving control for driving the drain pump to drain by ignoring the command of the controller for controlling the indoor unit to work or stop working when the water level detecting mechanism outputs the trigger signal.
By the first drain driving control, the drain pump is stopped by being operated in accordance with the operation of the indoor unit. In the second drain driving control, the drain pump is operated in response to the output of the trigger signal by the water level detecting means, and the output of the trigger signal is stopped, thereby effectively and reliably discharging the drain to the outside.
In some embodiments of the application, the drainage control mechanism comprises: a driving circuit for driving the drain pump; a trigger input section configured to generate a set of level signals based on the water level detection mechanism outputting a trigger signal or stopping outputting the trigger signal; an operation input section configured to generate a set of level signals based on an instruction to operate the indoor unit according to the controller or an instruction to stop operating the indoor unit by the controller; the first gating part is used for conducting the driving circuit to drive the drainage pump to drain when the first gating part outputs a first effective level signal, and the first effective level signal is generated based on the output trigger signal of the water level detection mechanism; and the second gating part is used for conducting the driving circuit to drive the drainage pump to drain when the trigger input part does not output the first effective level signal and the operation input part outputs the second effective level signal, and the second effective level signal is executed based on the controller to enable the indoor heat exchanger to work and generate as an evaporator.
In some embodiments of the present application, the driving circuit includes: one end of a switching path of the first switching element is coupled with the power supply end, and the other end of the switching path of the first switching element is grounded; the first gating portion includes: one end of a switching path of the second switching element is coupled with the water level detection mechanism, and the other end of the switching path of the second switching element is coupled with the control end of the first switching element; the second gating portion includes: one end of a switching path of the third switching element is coupled with the power supply end, the other end of the switching path of the third switching element is coupled with the control end of the first switching element, and the control end of the third switching element is coupled with the controller.
In some embodiments of the present application, the first active level signal is a low level signal; the driving circuit includes: the emitter of the first triode is coupled with the power supply end, one path of the collector is grounded, and the other path of the collector is coupled with the drainage pump; the first gating portion includes: the negative electrode of the first diode is coupled with the water level detection mechanism, and the positive electrode of the first diode is coupled with the base electrode of the first triode through the first resistor; the second gating portion includes: and the collector of the second triode is coupled with the power supply end, the other path of the collector of the second triode is coupled with the base electrode of the first triode through the first resistor, and the base electrode of the second triode is coupled with the controller.
In some embodiments of the present application, the air conditioner further includes a current detection mechanism configured to detect an operating current of the drain pump in a drain state; a current protection control mechanism configured to: when the current detection value of the current detection means is equal to or greater than a predetermined value, the first drain driving control or the second drain driving control is ignored, and the operation of the drain pump is stopped.
In some embodiments of the application, the current protection control is further configured to: when the current detection value of the current detection means is equal to or less than a predetermined value, the first drainage driving control or the second drainage driving control is resumed.
In some embodiments of the application, the drainage control mechanism comprises: the driving circuit comprises at least one switching element, the switching element is turned on, the drainage pump drains water, the switching element is turned off, and the drainage pump stops draining water; the current protection control mechanism comprises a protection thermistor, one end of the protection thermistor is connected with the control end of the switching element, and the other end of the protection thermistor is connected with the drainage pump.
In some embodiments of the application, the temperature parameter of the protection thermistor is configured to: the protection thermistor is selected among thermistors that satisfy a curie temperature having a first set temperature interval higher than the allowable operating temperature of the controller.
In some embodiments of the present application, an air conditioner includes: a compressor configured to compress a refrigerant; an indoor unit; a water receiving tray configured to temporarily store condensed water attached to the indoor unit and falling down; a drain pump configured to drain water in the drain pan; a water level detection mechanism configured to detect a water level in the water pan and output a trigger signal if the actual water level is above a set water level and stop outputting the trigger signal if the actual water level is below the set water level; a controller configured to control an operation or a stop of the indoor unit; a drainage control mechanism configured to include: a first drain driving control for driving the drain pump under a condition that the drain pump operation time is longer than the compressor operation time when the controller executes an instruction to operate the indoor unit and the compressor is in an operation state while the water level detecting mechanism stops outputting the trigger signal; and a second drain driving control for driving the drain pump to drain under a condition that the drain pump operation time is longer than the interval between outputting the trigger signal and stopping outputting the trigger signal by ignoring the command of the controller to control the indoor unit to operate or stop operating when the trigger signal is outputted from the water level detecting means.
In some embodiments of the application, the drainage control mechanism is further configured to include: and a third drain driving control for driving the drain pump to drain under the condition that the drain pump operation time is less than the first drain driving control or the second drain driving control when the controller executes the instruction for operating the indoor unit and the compressor is in the stopped state and the time of the compressor in the stopped state is greater than the set time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a diagram of a refrigeration system according to a first embodiment of the air conditioner provided by the present application;
fig. 2 is a schematic diagram showing the operation relationship of the water level detection mechanism, the indoor unit, and the drain pump when the air conditioner shown in fig. 1 performs the first drain driving control;
fig. 3 is a schematic diagram showing the operation relationship of the water level detection mechanism, the indoor unit, and the drain pump when the air conditioner shown in fig. 1 performs the second drain driving control;
FIG. 4 is a flow chart of the air conditioner shown in FIG. 1;
FIG. 5 is a schematic view showing a first construction of a drainage control mechanism in the air conditioner shown in FIG. 1;
FIG. 6 is a first circuit diagram of the drain control mechanism shown in FIG. 5;
FIG. 7 is a second circuit diagram of the drainage control mechanism shown in FIG. 5;
FIG. 8 is a third circuit diagram of the drain control mechanism shown in FIG. 5;
fig. 9 is a schematic view showing a second construction of the drainage control mechanism in the air conditioner shown in fig. 1;
FIG. 10 is a first circuit diagram of the drain control mechanism shown in FIG. 9;
FIG. 11 is a second circuit diagram of the drain control mechanism shown in FIG. 9;
FIG. 12 is a third circuit diagram of the drain control mechanism shown in FIG. 9;
FIG. 13 is a flow chart of a third embodiment of an air conditioner according to the present application;
FIG. 14 is a partial flow chart of a third embodiment of an air conditioner according to the present application;
fig. 15 is a timing chart when the air conditioner shown in fig. 13 and 14 performs the first drain driving control;
fig. 16 is a timing chart when the air conditioner shown in fig. 13 performs the second drain driving control.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
First embodiment
Next, the structure of the air conditioner according to the present embodiment will be described with reference to fig. 1. Fig. 1 is a refrigeration system diagram of an air conditioner according to the present embodiment.
As shown in fig. 1, an air conditioner 1 of the present embodiment is a central air conditioning system. A central air conditioning system is an air conditioning system that performs processing, transportation, and distribution of air in a concentrated or semi-concentrated manner, such as purification (or purification), cooling (or heating), humidification (or dehumidification), etc., in the same building (group). And the air treatment of each room is carried by a respective unitary air conditioning end (e.g., unit, window, split, etc., air conditioning end), respectively, known as a full dispersion system. The central air conditioner is used for creating an indoor air environment with standard temperature, standard humidity, standard cleanliness and freshness so as to meet the air conditioning requirements of living comfort or production process.
Taking a water chiller as an example, the structure and principle of the central air conditioning system are described.
The chiller operates based on a vapor compression refrigeration cycle, specifically, a vapor compression refrigeration cycle including a series of processes involving compression, condensation, expansion, and evaporation, through a compressor 10, a condenser 11, an expansion valve 12, and an evaporator 13.
The compressor 10 compresses a refrigerant gas having a low temperature and a low pressure into a refrigerant gas having a high temperature and a high pressure, and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser 11. The condenser 11 condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process. This heat is absorbed by the cooling water in the cooling water line near the condenser 11 and is further sent to the outdoor cooling tower via the cooling water, and finally released to the ambient air. After heat exchange with the ambient air, the cooling water with reduced temperature flows out of the cooling tower and is returned to the cooling water pipeline for the next cycle.
The expansion device (for example, the expansion valve 12) expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser 11 into a low-pressure liquid-phase refrigerant.
The evaporator 13 evaporates the refrigerant expanded in the expansion device and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor 10. The evaporator 13 can bring the chilled water to a lower temperature by absorbing heat of the chilled water in the nearby chilled water piping 15 by utilizing latent heat of evaporation of the refrigerant. The low-temperature chilled water is further subjected to heat exchange with indoor air, takes away heat in a room or space, and finally returns to the water return pipeline. The heat exchange between the chilled water and the indoor air is driven by the indoor fan, the indoor fan blows the air through the chilled water pipeline, the indoor air temperature is reduced, and the indoor heat exchange is accelerated.
In the whole cycle, the water chiller can adjust the temperature of the indoor space.
The water chiller may be a screw chiller, a centrifugal chiller, a piston chiller (hot chiller), or the like.
In the present embodiment, the outdoor unit of the air conditioner 1 includes a compressor 10, an outdoor heat exchanger, a cooling water line, and an outdoor fan, and the indoor unit 16 includes a freezing water line 15 and an indoor fan, performing heat exchange with indoor air. Also, in some embodiments of the present application, the indoor unit 16 may be provided in several numbers.
In other embodiments of the present application, the indoor unit 16 may also refer to an indoor heat exchanger (evaporator 13) and an indoor fan. I.e. without a chilled water line, is directly heat exchanged with the air by the evaporator 13 to condition the indoor air.
In some embodiments of the present application, the indoor heat exchanger and the outdoor heat exchanger may also be switched to function as the condenser 11 or the evaporator 13. When the indoor heat exchanger is used as the condenser 11, the air conditioner 1 performs a heating mode (also referred to as a heat pump hot water unit), and when the indoor heat exchanger is used as the evaporator 13, the air conditioner 1 performs a cooling mode.
In the present embodiment, chilled water-indoor air heat exchange is performed in the indoor unit 16 using an end, such as a fan coil.
Since the dew point temperature of the indoor humid air is lower than the surface temperature of the chilled water piping 15, and possibly lower than other areas where the surface temperature is lower, condensed water is formed in the indoor unit 16. A water tray 17 is provided near a position below the fan coil, the water tray 17 being configured to temporarily store condensed water that has adhered to the indoor unit 16 and fallen down. The indoor unit 16 is provided with a drain pump 18, and the drain pump 18 is configured to drain water in the drain pan 17.
In the present embodiment, the drain pump 18 is driven by a dc motor.
The control system of the air conditioner 1 is provided with a control device 19, and the control device 19 is optionally built in an outdoor unit to control the compressor 10, the throttle device, the outdoor fan, and the like. The outdoor unit is optionally provided with an outdoor temperature sensor for measuring the outdoor air temperature, a water temperature sensor for measuring the cooling water inlet temperature and outlet water temperature, a temperature sensor or pressure sensor for detecting the temperature of the refrigerant discharged from the compressor 10, a temperature sensor or pressure sensor for detecting the temperature of the gas refrigerant sucked by the compressor 10, which are communicatively connected to the control device 19, the control device 19 being optionally communicatively connected to a temperature sensor for measuring the chilled water temperature. The control device 19 controls each of the execution means (for example, start/stop of the compressor 10, rotation speed, opening degree of the expansion valve 12, or combination of the compressor 10 and the expansion valve 12) to control deviation of the parameters to be adjusted within a required accuracy range, based on the parameters to be adjusted, for example, comparing an actual value of the chilled water temperature with a target value (given value). The control device 19 includes, for example, a microprocessor and a memory, and can control the compressor 10, the throttle device, and/or the outdoor fan in accordance with a program or the like stored in the memory.
The control system of the air conditioner 1 further includes a controller 20, and the controller 20 is configured to execute an instruction for controlling the operation of the indoor unit 16 or for controlling the operation of the indoor unit 16 to be stopped, for example, to control the start and stop of an indoor fan. The controller 20 is optionally coupled with a temperature sensor for determining the temperature of the indoor air. The controller 20 includes, for example, a microprocessor and a memory, and can control the indoor unit 16 in accordance with a program stored in the memory.
In the present embodiment, the controller 20 is coupled to the control terminal 21. The control terminal 21 optionally has a liquid crystal display device and buttons. The operation interface is used for performing relevant setting and operation by using corresponding operation interfaces such as an operation switch, a temperature setting key, a wind direction setting key, an air quantity setting key and the like. The operation switch is configured to operate the indoor unit 16 to operate or to stop operating. The controller 20 receives a corresponding communication signal and command each time the operation switch is operated, alternately switching between executing a command to control the indoor unit 16 to start operation and executing a command to control the indoor unit 16 to stop operation. The temperature setting key is used for inputting the room temperature desired by the user, the wind direction setting key is used for inputting the wind direction desired by the user when the wind direction setting switch is used for inputting the wind amount desired by the user, and the wind amount setting key is used for inputting the wind amount desired by the user. The control terminal 21 may be a remote control, a line controller or other mobile smart terminal such as a smart phone, a wearable device; the number of available control terminals 21 (with current control authority) is in one-to-one correspondence with the number of indoor units 16, that is, any indoor unit 16 can be independently operated or independently operated and stopped, that is, the start-stop and the rotation speed of the indoor fan can be independently operated.
The water pan 17 is provided with a water level detection mechanism 22, and the water level detection mechanism 22 is configured to detect the water level in the water pan 17 and output a trigger signal when the actual water level is above the set water level and stop outputting the trigger signal when the actual water level is below the set water level. The water level detection mechanism 22 is optionally provided with a buoyant float, and is optionally provided with a detection element (e.g., a proximity sensor) that detects the position of the float. The float can freely move up and down in the condensed water in the water receiving tray 17.
The first drain driving control and the second drain driving control of the drain control mechanism are described below.
Referring to the tables in fig. 2 and 3 and the flowchart provided in fig. 4, the start and end of the first and second drain driving controls will be described, taking one indoor unit as an example.
The drainage control means enters the first drainage driving control or the second drainage driving control depending on whether or not the water level detection means 22 outputs the trigger signal. If the water level detection mechanism 22 stops outputting the trigger signal, the first drain driving control is entered; when a key (button or operation area) for switching an operation switch of the control terminal is pressed, the drain pump 18 is driven to drain according to an instruction for the controller 20 to operate the indoor unit, or the drain pump 18 is stopped according to an instruction for the controller 20 to stop operating the indoor unit. The first drain driving control is terminated when a key (button or operation area) of an operation switch of the switching control terminal is pressed again. After which the next loop determination process is performed.
If the water level detection means 22 outputs a trigger signal, the second drain driving control is entered, and the controller 20 ignores an instruction to control the operation or stop the operation of the indoor unit, thereby driving the drain pump 18 to drain water. When a key (button or operation area) for switching an operation switch of the control terminal is pressed, the controller 20 executes an instruction to operate the indoor unit or an instruction to stop operating the indoor unit; but the drain pump 18 is operated only in the drain state. The second drain driving control is terminated when the water level detection mechanism 22 stops outputting the trigger signal. After which the next loop determination process is performed.
In the first drain driving control, the drain pump 18 is operated with the operation of the indoor unit (e.g., with the indoor fan). In the second drain driving control, the drain pump 18 is operated with the output of the trigger signal by the water level detecting means 22, and the drain can be effectively and reliably discharged to the outside. Particularly, after the central air conditioning system passes through a period of non-use interval in spring or autumn, accumulated water which is not completely dried in the whole system can be accumulated in certain indoor units due to uneven pipeline height in areas with high humidity, in this state, the second water drainage driving control can be automatically executed, the condition that the indoor units are not used but the ceiling air conditioner leaks water is avoided, bacteria breeding in a water receiving disc can be restrained, and obvious peculiar smell appears when air supply is started.
In some embodiments of the present application, the drain control mechanism is preferably implemented by a hardware circuit design. Fig. 5 is a schematic view of a first configuration of the drainage control mechanism. The drain control mechanism includes a drive circuit 27, a trigger input section 23, an operation input section 24, a first gate section 25, and a second gate section 26.
The driving circuit 27 drives the drain pump 18 to operate, specifically, provides a set of logic level signals, sets one of the high level and the low level to drive the direct current motor of the drain pump 18 to operate, and the drain pump 18 drains water; the other one drives the dc motor of the drain pump 18 to stop the operation, and the drain pump 18 stops the drainage. The driving circuit 27 is provided with a first switching element, one end of a switching path of the first switching element is coupled to the power supply terminal, and the other end of the switching path of the first switching element is grounded.
The trigger input section 23 is configured to generate a set of level signals based on the water level detection mechanism 22 outputting a trigger signal or stopping outputting a trigger signal, specifically setting one of the high and low levels to be generated based on the water level detection mechanism 22 outputting a trigger signal, and the other to stop outputting a trigger signal to be generated based on the water level detection mechanism 22. The level signal generated based on the output of the trigger signal by the water level detection mechanism 22 is defined as the first effective level signal.
The operation input section 24 is configured to generate a set of level signals based on an instruction to operate the indoor unit according to the execution of the controller 20 or the execution of the controller 20 to stop operating the indoor unit, and specifically sets one of the high and low levels to be generated based on an instruction to operate the indoor unit according to the execution of the controller 20 and the other to be generated based on an instruction to stop operating the indoor unit according to the execution of the controller 20. The level signal generated based on the instruction to cause the indoor unit according to the execution of the controller 20 is defined as a second active level signal.
The first gate 25 is configured to turn on the driving circuit 27 to drive the drain pump 18 to drain when the trigger input 23 outputs the first active level signal. The first gate portion 25 includes a second switching element, one end of a switching path of the second switching element is coupled to the water level detecting mechanism 22, and the other end is coupled to a control end of the first switching element.
The second gate 26 is configured to turn on the driving circuit 27 to drive the drain pump 18 to drain when the trigger input 23 does not output the first active level signal and when the operation input 24 outputs the second active level signal. The second gating portion 26 includes a third switching element, one of the switching paths of the third switching element is coupled to the power supply terminal, the other is coupled to the control terminal of the first switching element, and the control terminal of the third switching element is coupled to the controller 20.
Fig. 5 shows an alternative circuit design of the drain control mechanism, wherein the first active level signal is a low level signal (OFF active) and the second active level signal is a high level signal (ON active). The driving circuit 27 includes a first triode Q2Q, where the first triode Q2Q is a PNP triode, an emitter of the first triode Q2Q is coupled to a power supply terminal (optionally providing +13v power supply), and a collector of the first triode Q2Q is grounded through a resistor R8Q (optionally setting a resistance to 100K). The first gating portion 25 includes a first diode VD1, a cathode of the first diode VD1 is coupled to the water level detecting mechanism 22, and an anode of the first diode VD1 is coupled to a base of the first transistor Q2Q via a first resistor R7Q (with an optional set resistance of 10K). The second gating portion 26 includes a second triode Q5Q, the second triode Q5Q is an NPN triode, one path of collector of the second triode Q5Q is coupled to a power supply terminal (optionally providing +13v power supply) through a resistor R6Q, the other path is coupled to the base of the first triode Q2Q through a first resistor R7Q, and the base of the second triode Q5Q is coupled to the controller 20. When the first active level signal is received, the first diode VD1 is turned on, the first transistor Q2Q is turned on, the driving circuit 27 is turned on, and the drain pump 18 drains water. When the first active level signal is not received, the first diode VD1 is turned off, and isolation is achieved. If the second active level signal is received, the second transistor Q5Q is turned on, the first transistor Q2Q is turned on, and the driving circuit 27 turns on the drain pump 18 to drain. If the second active level signal is not received, the second transistor Q5Q is turned off, the first transistor Q2Q is turned off, the driving circuit 27 is turned off, and the drain pump 18 stops draining.
Fig. 6 is an alternative circuit design of the drainage control mechanism. Wherein the first diode is replaced by a third triode Q1Q. The third triode is a PNP diode.
Fig. 7 is an alternative circuit design of the drainage control mechanism. The base electrode of NPN triode Q1Q is coupled with water level detection mechanism 22, and the collector electrode is coupled with the power supply end through resistance R2Q on the one hand, and the positive electrode of one diode in the double-row switching diode VD2Q on the other hand. The base electrode of NPN triode Q4Q is coupled with controller 20, the collector electrode is coupled with the base electrode of PNP triode Q3Q, one path of emitter is grounded, and the other path of emitter is connected with the base electrode through resistor R9Q. The emitter of PNP triode Q3Q is coupled to the power supply terminal, one path of collector is grounded through resistor R10Q, and the other path is coupled to the positive electrode of another path of diode in dual-row switching diode VD 2Q. The negative electrodes of the double-row switching diodes VD2Q are connected with the base electrode of an NPN triode Q5Q, the emitter electrode of the NPN triode Q5Q is grounded, one path of collector electrode is coupled with a power supply end through a resistor R6Q, the other path of collector electrode is connected with the base electrode of a PNP triode Q2Q through a resistor R7Q, the emitter electrode of the PNP triode Q2Q is coupled with the power supply end, one path of collector electrode is grounded through a resistor R8Q, and the other path of collector electrode is coupled with a drainage pump 18.
All three circuits ensure that the drive circuit 27 is turned on when the first active level signal is received, the drain pump 18 drains water, and the first active level signal has the highest priority.
During the drain of the drain pump 18, the operating current is below the normal operating current. If an abnormal condition occurs, such as a stall, the drain pump 18 may be irreversibly damaged. To address this problem, the air conditioner is also designed with a current detection mechanism 28. The current detection mechanism 28 is configured to detect an operating current of the drain pump 18 in a drain state. The operation current of the drain pump 18 may be sampled in the form of a direct current value or in the form of a temperature value in a direct current-temperature proportional relationship.
The current protection control means 29 is configured to ignore the first drain driving control or the second drain driving control when the current detection value of the current detection means 28 is equal to or greater than a predetermined value, and stop the operation of the drain pump 18. Meanwhile, when the current detection value of the current detection means 28 is equal to or smaller than the predetermined value, the first drainage driving control or the second drainage driving control is resumed.
The current protection control mechanism 29 is optionally implemented by a switching element. In the present embodiment, it is more preferable to use a protection thermistor PTC1Q. One end of the protection thermistor PTC1Q is connected with the control end of the switching element, and the other end is connected with the drainage pump 18.
As shown in fig. 10 to 12, one end of the protection thermistor PTC1Q is coupled to the drain pump 18, and the other end is coupled to the collector of the first transistor Q2Q. When the current detection value is equal to or higher than the predetermined value, the temperature of the protection thermistor PTC1Q is higher than the curie temperature of the protection thermistor PTC1Q, and the drive circuit 27 is automatically turned off. When the temperature falls below the curie temperature of the protection thermistor PTC1Q, the protection state is exited, and the drive circuit 27 is automatically turned on. If the abnormality or malfunction condition is removed at this time, the drain pump 18 will resume the normal operation of the first drain driving control or the second drain driving control. If the abnormality or failure is not removed, the protection thermistor PTC1Q enters the protection state again, and the driving circuit 27 is automatically cut off.
The circuit constituting the drainage control mechanism and the controller 20 are mounted on one main board at the same time. The temperature parameter of the protection thermistor PTC1Q is configured to select the protection thermistor PTC1Q among thermistors having curie temperatures higher than the first set temperature interval of the allowable operating temperature of the controller 20. On the one hand, the protection thermistor PTC1Q does not operate with a current depending on the local temperature and the diameter of the protection thermistor PTC1Q, and it is preferable to select a thermistor of high curie temperature and small size from the viewpoint of cost, but such a component allows a higher surface temperature, which may have adverse effects on the circuit, the controller 20. For balance reasons, the first set temperature interval is 20-40 ℃, and the curie temperature of the protection thermistor PTC1Q is optionally 80 ℃, 100 ℃ and 120 ℃.
Second embodiment:
the first and second drain driving controls in the drain control mechanism shown in fig. 2 to 4 are also applicable to a general split type air conditioner. The water pan is arranged below the indoor heat exchanger.
In contrast to the above example, in the present embodiment, the first drain driving control of the drain driving control is: when the controller 20 executes a command to operate the indoor heat exchanger as an evaporator, the drain pump 18 is driven to drain water, or when the controller 20 executes a command to stop operating the indoor heat exchanger as an evaporator, the drain pump 18 is driven to stop draining water.
The second drainage driving control is as follows: when the water level detection means 22 outputs a trigger signal, the controller 20 is ignored and the drain pump 18 is driven to drain water by executing an instruction to operate the indoor heat exchanger as an evaporator or an instruction to stop operating the indoor heat exchanger as an evaporator.
Third embodiment:
the third embodiment is different in design from the first and second drain driving controls in comparison with the operations of the first and second embodiments.
Referring to fig. 13, 15 and 16, the start and end of the first and second drain driving controls in the present embodiment will be described.
The drainage control means enters the first drainage driving control or the second drainage driving control depending on whether or not the water level detection means 22 outputs the trigger signal. If the water level detection mechanism 22 stops outputting the trigger signal, the first drain driving control is entered. When a key for switching an operation switch of the control terminal is pressed, an operation state of the compressor is sampled according to an instruction of the controller 20 to operate the indoor unit, and if the compressor enters the operation state, the drain pump 18 is driven to drain water, and the drain pump 18 is stopped when the compressor is in a stopped state and a condition that an operation time t2 of the drain pump 18 is greater than an operation time t1 of the compressor is satisfied. Thereafter, sampling of the operation state of the compressor is performed again, and when the compressor enters the operation state, the drain pump 18 is driven again under the condition that the operation time of the drain pump 18 is longer than the operation time of the compressor, until the first drain driving control is terminated when the key for switching the operation switch of the control terminal is pressed again and the controller 20 executes the instruction for stopping the operation of the indoor unit, and thereafter, the next cycle determination process is performed. The mode can ensure that the water receiving disc is completely emptied in each drainage process, and water accumulation is not easy to occur.
If the water level detection mechanism 22 outputs the trigger signal, the second drain driving control is entered, the command of the controller 20 to control the indoor unit to operate or stop operating is ignored, the drain pump 18 is driven under the condition that the operation time t5 of the drain pump 18 is longer than the interval t6 between the output of the trigger signal and the stop of the output of the trigger signal, the frequent output of the trigger signal by the water level detection mechanism 22 is avoided, the system fluctuation and unnecessary interval noise are caused, and the frequent start and stop of the motor are avoided, at the same time, the extra energy consumption is avoided. The second drain driving control drives the drain pump 18 to drain when the water level detection mechanism 22 outputs the trigger signal, and stops the drain pump 18 on the condition that the operation time t5 of the drain pump 18 is greater than the interval t6 between the output of the trigger signal and the stop of the output of the trigger signal, and the second drain driving control is suspended. After which the next loop determination process is performed.
As shown in fig. 14, in the process of executing the first drain driving control, if the compressor is in the stopped state and the time of the compressor in the stopped state is greater than the set time (for example, the time in the stopped state is for the time period t 3), the drain pump 18 is driven to drain under the condition that the drain pump 18 operation time is less than the first drain driving control or the second drain driving control driving the drain pump 18 operation time. The second drain driving control drives the drain pump 18 to drain when the compressor is in the stopped state for a period of time t3, and stops draining after the drain period of time reaches t4, t4 being smaller than t2 and t5, i.e., completely draining the accumulated water in the indoor unit, and controlling the total energy consumption and the noise level to be optimal.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. An air conditioner, comprising:
a compressor configured to compress a refrigerant;
an indoor unit;
a water receiving tray configured to temporarily store condensed water that is attached to the indoor heat exchanger and falls down;
a drain pump configured to drain water in the water pan;
a water level detection mechanism configured to detect a water level in the water pan and output a trigger signal if an actual water level is above a set water level and stop outputting the trigger signal if the actual water level is below the set water level;
a controller configured to control the operation or stop operation of the indoor unit;
characterized by further comprising:
a drain control mechanism configured to enter the first drain driving control or the second drain driving control according to a condition whether the water level detection mechanism outputs the trigger signal:
a first drain driving control for driving the drain pump under a condition that a drain pump operation time is longer than a compressor operation time when the water level detecting means stops outputting the trigger signal, the controller executing an instruction to operate the indoor unit and the compressor is in an operation state;
and a second drain driving control for driving the drain pump to drain under a condition that the drain pump operation time is longer than the interval between outputting the trigger signal and stopping outputting the trigger signal by ignoring the command of the controller to control the indoor unit to operate or stop operating when the trigger signal is outputted from the water level detecting means.
2. The air conditioner according to claim 1, wherein the drainage control mechanism is further configured to include:
and a third drain driving control for driving the drain pump to drain water under a condition that the drain pump operation time is less than the first drain driving control or the second drain driving control when the controller executes an instruction to operate the indoor unit, the compressor is in a stopped state, and the time of the compressor in the stopped state is greater than a set time.
3. An air conditioner according to claim 1 or 2, wherein,
the drainage control mechanism includes:
a driving circuit for driving the drain pump;
a trigger input section configured to generate a set of level signals based on the water level detection mechanism outputting a trigger signal or stopping outputting a trigger signal;
an operation input section configured to generate a set of level signals based on an instruction to operate the indoor unit according to the controller or an instruction to stop operating the indoor unit by the controller;
the first gating part is used for conducting the driving circuit to drive the drainage pump to drain when the trigger input part outputs a first effective level signal, and the first effective level signal is generated based on the trigger signal output by the water level detection mechanism; and
and the second gating part is used for conducting the driving circuit to drive the drainage pump to drain water when the trigger input part does not output the first effective level signal and the operation input part outputs the second effective level signal, and the second effective level signal is generated by enabling the indoor heat exchanger to work as an evaporator based on the controller.
4. An air conditioner according to claim 3, wherein:
the driving circuit includes: one end of a switching path of the first switching element is coupled with the power supply end, and the other end of the switching path of the first switching element is grounded;
the first gating portion includes: one end of a switching path of the second switching element is coupled with the water level detection mechanism, and the other end of the switching path of the second switching element is coupled with the control end of the first switching element;
the second gating portion includes: and one end of a switching path of the third switching element is coupled with the power supply end, the other end of the switching path of the third switching element is coupled with the control end of the first switching element, and the control end of the third switching element is coupled with the controller.
5. An air conditioner according to claim 3, wherein,
the first effective level signal is a low level signal;
the driving circuit includes: the emitter of the first triode is coupled with the power supply end, one path of the collector is grounded, and the other path of the collector is coupled with the drainage pump;
the first gating portion includes: the negative electrode of the first diode is coupled with the water level detection mechanism, and the positive electrode of the first diode is coupled with the base electrode of the first triode through a first resistor;
the second gating portion includes: and the collector of the second triode is coupled with the power supply end, the other path of the collector of the second triode is coupled with the base electrode of the first triode through the first resistor, and the base electrode of the second triode is coupled with the controller.
6. An air conditioner according to claim 1 or 2, wherein,
further comprises:
a current detection mechanism configured to detect an operating current of the drain pump in a drain state;
a current protection control mechanism configured to: when the current detection value of the current detection means is equal to or greater than a predetermined value, the first drain driving control or the second drain driving control is ignored, and the operation of the drain pump is stopped.
7. The air conditioner according to claim 6, wherein,
the current protection control is further configured to:
and restoring the first drainage driving control or the second drainage driving control when the current detection value of the current detection mechanism is less than or equal to a predetermined value.
8. The air conditioner according to claim 7, wherein,
the drainage control mechanism includes:
a driving circuit including at least one switching element, the switching element being turned on, the drain pump draining water, the switching element being turned off, the drain pump stopping draining water;
the current protection control mechanism comprises a protection thermistor, one end of the protection thermistor is connected with the control end of the switching element, and the other end of the protection thermistor is connected with the drainage pump.
9. The air conditioner according to claim 8, wherein,
the temperature parameter of the protection thermistor is configured to:
the protection thermistor is selected among thermistors that meet a curie temperature having a first set temperature interval above the allowable operating temperature of the controller.
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| CN202210318896.2A CN114923218B (en) | 2022-03-29 | 2022-03-29 | Air conditioner |
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| CN202210318896.2A CN114923218B (en) | 2022-03-29 | 2022-03-29 | Air conditioner |
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