CN114060909A - Air conditioner and control method thereof - Google Patents
Air conditioner and control method thereof Download PDFInfo
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- CN114060909A CN114060909A CN202111265933.XA CN202111265933A CN114060909A CN 114060909 A CN114060909 A CN 114060909A CN 202111265933 A CN202111265933 A CN 202111265933A CN 114060909 A CN114060909 A CN 114060909A
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000010257 thawing Methods 0.000 claims abstract description 128
- 239000003507 refrigerant Substances 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 7
- 230000000670 limiting effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 125000003003 spiro group Chemical group 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor 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
- F24F11/62—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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
- F24F2110/22—Humidity of the outside air
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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)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of air conditioners, and particularly provides an air conditioner and a control method thereof. The defrosting device aims to solve the problems that the defrosting mode of the existing air conditioner is not good, the defrosting effect is easily influenced, and even the indoor unit cannot normally heat. Therefore, the outdoor unit of the air conditioner comprises an outdoor heat exchange branch and a defrosting branch connected with the outdoor heat exchange branch, wherein the outdoor heat exchange branch is provided with a compressor and an outdoor heat exchanger, one end of the defrosting branch is connected to the exhaust end of the compressor, the other end of the defrosting branch is connected to the air inlet end of the compressor, and at least one part of the defrosting branch is arranged on the surface of the outdoor heat exchanger, so that the defrosting branch can bring the heat in high-temperature and high-pressure gaseous refrigerant generated by the compressor to the outdoor heat exchanger.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly provides an air conditioner and a control method thereof.
Background
The air conditioner comprises an indoor unit, an outdoor unit and a refrigerant circulation loop connected between the indoor unit and the outdoor unit, wherein the refrigerant continuously exchanges heat between the outdoor unit and the indoor unit through the refrigerant circulation loop, so that the effect of changing the room temperature is achieved. Taking the air conditioner to operate and heating the working condition as an example, because the coil pipe of the outdoor unit is always in the low temperature state, and the outdoor temperature at this moment is usually lower, if the outdoor humidity is also higher at this moment, the coil pipe of the outdoor unit is easy to produce the frosting phenomenon, and along with the continuous progress of frosting, the heat exchange efficiency of the outdoor unit can also be sharply reduced, and then the heating capacity of the whole air conditioner is continuously attenuated. Therefore, in the heating condition, it is very important to ensure that the coil of the outdoor unit does not frost, so that the heat exchange efficiency of the whole air conditioner is improved.
In recent years, in order to effectively solve the problem of frost formation, those skilled in the art have proposed many solutions which can achieve the defrosting effect, but each of them has some problems. Taking a mode of controlling the refrigerant reverse circulation to achieve defrosting as an example, the mode can directly cause that the indoor unit cannot normally heat, so that the normal heating experience of a user is influenced; further, taking a way of providing a heating member to achieve defrosting as an example, this way not only requires a large amount of energy consumption, but also has problems of low heating efficiency and low defrosting efficiency.
Accordingly, there is a need in the art for a new air conditioner and a method for controlling the same to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to solve the technical problems, namely, the problems that the defrosting effect is easily influenced and even the indoor unit cannot normally heat due to poor defrosting mode of the existing air conditioner are solved.
In a first aspect, the present invention provides a method for controlling an air conditioner, an outdoor unit of the air conditioner includes an outdoor heat exchange branch and a defrost branch connected to the outdoor heat exchange branch,
the outdoor heat exchange branch is provided with a compressor and an outdoor heat exchanger,
one end of the defrosting branch is connected to the exhaust end of the compressor, the other end of the defrosting branch is connected to the air inlet end of the compressor, and at least one part of the defrosting branch is arranged on the surface of the outdoor heat exchanger;
the control method comprises the following steps:
acquiring humidity near the outdoor heat exchanger;
and controlling the on-off state of the defrosting branch according to the humidity near the outdoor heat exchanger.
In a preferred technical solution of the above control method, the step of "acquiring the humidity near the outdoor heat exchanger" specifically includes:
acquiring humidity at a plurality of reference points on the outdoor heat exchanger;
calculating the average value of the humidity at a plurality of reference points on the outdoor heat exchanger, and recording the average value as the humidity near the outdoor heat exchanger;
the step of controlling the on-off state of the defrosting branch according to the humidity near the outdoor heat exchanger specifically comprises the following steps:
and controlling the on-off state of the defrosting branch according to the average value of the humidity at a plurality of reference points on the outdoor heat exchanger.
In a preferred embodiment of the above control method, a part of the plurality of reference points is located near the defrost branch.
In a preferred technical solution of the above control method, the step of "controlling the on-off state of the defrosting branch according to an average value of the humidity at a plurality of reference points on the outdoor heat exchanger" specifically includes:
and if the average value of the humidity at a plurality of reference points on the outdoor heat exchanger is greater than a first preset humidity, controlling the defrosting branch to be communicated.
In a preferable embodiment of the above control method, the first preset humidity is 67%.
In a preferred embodiment of the above control method, the control method further includes:
under the condition that the defrosting branch is communicated, acquiring the humidity near the outdoor heat exchanger again;
and selectively controlling the defrosting branch to be cut off according to the obtained humidity near the outdoor heat exchanger.
In a preferred technical solution of the above control method, the step of "selectively controlling the defrosting branch to be turned off according to the re-acquired humidity near the outdoor heat exchanger" specifically includes:
and if the humidity near the outdoor heat exchanger obtained again is smaller than a second preset humidity, controlling the defrosting branch to be cut off.
In a preferred technical solution of the above control method, the step of controlling the defrosting branch to be cut off if the humidity near the outdoor heat exchanger obtained again is smaller than a second preset humidity specifically includes:
and if the humidity near the outdoor heat exchanger obtained again is smaller than a second preset humidity, controlling the defrosting branch to be cut off after a preset time.
In a preferable technical scheme of the control method, the preset time period is 5 minutes.
In another aspect, the present invention further provides an air conditioner, which includes a controller, wherein the controller is capable of executing the control method in any one of the above-mentioned preferred technical solutions.
Under the condition of adopting the technical scheme, the outdoor unit of the air conditioner comprises an outdoor heat exchange branch and a defrosting branch connected with the outdoor heat exchange branch, wherein a compressor and an outdoor heat exchanger are arranged on the outdoor heat exchange branch, one end of the defrosting branch is connected to the exhaust end of the compressor, the other end of the defrosting branch is connected to the air inlet end of the compressor, and at least one part of the defrosting branch is arranged on the surface of the outdoor heat exchanger. Based on the structure arrangement, the invention can bring the heat in the high-temperature and high-pressure gaseous refrigerant generated by the compressor to the outdoor heat exchanger through the defrosting branch, can effectively prevent the frost phenomenon when the outdoor heat exchanger is not frosted, can also effectively remove the frost under the condition of ensuring that the indoor heat exchanger can normally heat when the outdoor heat exchanger is frosted, has high defrosting efficiency and low energy consumption in the defrosting mode, can furthest prevent the outdoor heat exchanger from being frosted, and further effectively ensures the heat exchange efficiency of the outdoor heat exchanger. In addition, the control method of the present invention includes: and acquiring the humidity near the outdoor heat exchanger, and controlling the on-off state of the defrosting branch according to the humidity near the outdoor heat exchanger so that the air conditioner can accurately judge the defrosting time, thereby effectively avoiding the frost phenomenon and further ensuring the heat exchange efficiency to the maximum extent.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
fig. 1 is a partial schematic view illustrating an internal structure of an outdoor unit of an air conditioner according to the present invention;
FIG. 2 is a flow chart of the main steps of the control method of the present invention;
FIG. 3 is a flow chart of the specific steps of a preferred embodiment of the control method of the present invention;
reference numerals:
11. an outdoor heat exchange branch; 111. an outdoor heat exchanger; 112. a compressor; 113. a gas-liquid separator;
12. a defrosting branch; 121. a first defrost stage; 122. a second defrost stage; 123. a one-way valve;
13. a base;
101. a humidity sensor.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications. For example, the air conditioner of the present invention may be a multi-split air conditioner, or may be a one-to-one air conditioner; the indoor unit of the air conditioner can be a wall-mounted indoor unit or a cabinet indoor unit. Such changes in the specific type of air conditioner do not depart from the basic principle of the present invention and fall within the protection scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring first to fig. 1, a partial schematic view of an internal structure of an outdoor unit of an air conditioner according to the present invention is shown. Specifically, the air conditioner of the present invention includes an indoor unit and an outdoor unit, wherein a refrigerant circulation loop is disposed between the indoor unit and the outdoor unit, and a refrigerant for exchanging heat indoors and outdoors flows through the refrigerant circulation loop, and includes two parts, namely an indoor heat exchange branch and an outdoor heat exchange branch 11. Further, an indoor heat exchanger, a compressor 112, a four-way valve, an outdoor heat exchanger 111 and an electronic expansion valve are arranged on the refrigerant circulation loop; the indoor heat exchanger is located on the indoor heat exchange branch, the compressor 112 and the outdoor heat exchanger 111 are located on the outdoor heat exchange branch 11, a refrigerant passes through the refrigerant circulation loop and continuously circulates between the indoor heat exchanger and the outdoor heat exchanger to realize heat exchange, and the reverse circulation of the refrigerant in the refrigerant circulation loop can be controlled when the four-way valve is reversed, so that the air conditioner is switched between a refrigerating working condition and a heating working condition. It should be noted that, the invention does not limit the specific structure of the air conditioner, and the technicians can set the structure according to the actual use requirements; for example, the specific structures and the number of the indoor units and the outdoor units, the specific types and the number of the indoor heat exchangers and the outdoor heat exchangers 111, and other heat exchange elements are further disposed on the refrigerant circulation loop.
Further, the outdoor unit of the air conditioner of the present invention further includes a defrosting branch 12 connected to the outdoor heat exchanging branch 11, one end of the defrosting branch 12 is connected to the discharge end of the compressor 112, the other end of the defrosting branch 12 is connected to the intake end of the compressor 112, and at least a portion of the defrosting branch 12 is disposed on the surface of the outdoor heat exchanger 111. It should be noted that, the specific shape of the defrosting branch 12 and the connection position of the two ends thereof are not limited in the present invention, and a technician can set the defrosting branch according to actual use requirements, as long as the defrosting branch 12 can guide the high-temperature and high-pressure gaseous refrigerant discharged from the discharge end of the compressor 112 to the surface of the outdoor heat exchanger 111 to achieve defrosting, and then the refrigerant is sent back to the outdoor heat exchange branch 11 through the intake end of the compressor 112.
Referring to fig. 1, as shown in fig. 1, in the preferred embodiment, the outdoor heat exchanging branch 11 is further provided with a gas-liquid separator 113, wherein the gas-liquid separator 113 is disposed at an air inlet end of the compressor 112, that is, the refrigerant enters the compressor 112 after flowing through the gas-liquid separator 113, so as to effectively avoid liquid impact and better protect the use safety of the compressor 112. Of course, this is not a restrictive arrangement, and the outdoor heat exchange branch 11 may not be provided with the gas-liquid separator 113; in addition, the present invention does not limit the specific type of the gas-liquid separator 113, and the skilled person can set the type according to the actual use requirement.
Based on the arrangement of the gas-liquid separator 113, as a preferable connection manner, the other end of the defrosting branch 12 is preferably connected to the inlet end of the gas-liquid separator 113, so as to avoid the liquid impact phenomenon to the maximum extent; of course, this is only a preferred arrangement, and the other end of the defrosting branch 12 can also be directly connected to the air inlet end of the compressor 112, which is not restrictive, and the technician can set the arrangement according to the actual use requirement.
As a preferable arrangement, the defrosting branch 12 is of a capillary structure, that is, the defrosting branch 12 is composed of capillaries, so that pressure balance can be effectively ensured while the defrosting effect is ensured; of course, the invention does not limit the specific type and pipe diameter of the capillary structure, and the technician can set the capillary structure according to the actual use requirement.
Further preferably, the defrosting branch 12 is further provided with a check valve 123, in the preferred embodiment, the check valve 123 is disposed near an exhaust port of the compressor 112, and the check valve 123 can not only control the on-off state of the defrosting branch 12, but also can effectively control the flow direction of the refrigerant in the defrosting branch 12. It should be noted that, although the control valve is the check valve 123 in the preferred embodiment, this is not restrictive, and other types of valves may be used as long as the on/off state of the defrosting branch 12 can be controlled.
Further, in the preferred embodiment, the outdoor unit of the air conditioner of the present invention includes a casing in which heat exchange elements of the outdoor unit are disposed, and the casing includes a base 13 and a cover (not shown) covering the base 13, wherein the base 13 has a rectangular plate-like structure, and the cover has a rectangular box-like structure, and the outdoor heat exchanger 111 and the compressor 112 are disposed on the base 13, and the cover can be connected to the base 13 so as to effectively protect the heat exchange elements therein. It should be noted that the present invention does not limit the specific structure and the specific shape of the base 13 and the housing, and the skilled person can set the structure and the shape according to the actual use requirement as long as the outdoor heat exchanger 111 and the compressor 112 can be arranged on the base 13.
As a preferable connection manner, both the outdoor heat exchanger 111 and the compressor 112 are connected to the base 13 by means of screw connection. On one hand, the screw connection mode has higher connection strength, and can effectively ensure the connection reliability; on the other hand, the spiro union's mode more does benefit to heat conduction to further promote the defrosting effect. Of course, it is understood that this connection is only a preferred connection, but not limiting, and the technician can set it according to the actual use requirement; for example, welding, snapping, etc. are also possible. Changes in the specific connection mode are not made to the basic principle of the invention and belong to the protection scope of the invention.
With continued reference to fig. 1, as shown in fig. 1, in the present preferred embodiment, at least another portion of the defrosting branch 12 is disposed on the base 13, i.e., both the surface of the outdoor heat exchanger 111 and the surface of the base 13 are disposed with the defrosting branch 12. Specifically, the defrosting branch 12 includes a first defrosting section 121 and a second defrosting section 122, wherein the first defrosting section 121 is a portion where the defrosting branch 12 is disposed on the surface of the outdoor heat exchanger 111, and the second defrosting section 122 is a portion where the defrosting branch 12 is disposed on the surface of the base 13. It should be noted that the present invention does not limit the specific structure and connection manner of the first defrosting section 121 and the second defrosting section 122, and the skilled person can set the defrosting operation according to the actual use requirement.
As a preferred setting, the first defrosting section 121 and the second defrosting section 122 are arranged in parallel, so that the defrosting branch 12 can selectively communicate the first defrosting section 121 and the second defrosting section 122 according to actual use requirements, and further effectively adapt to different defrosting situations. Of course, the connection mode is not restrictive, and technicians can set the connection mode according to actual use requirements; for example, the first defrosting section 121 and the second defrosting section 122 may be arranged in series, which is not restrictive.
Further, in the present preferred embodiment, the outdoor heat exchanger 111 is an "L" shaped plate-shaped heat exchanger, and as a preferred arrangement of the first defrosting section 121, the first defrosting section 121 is arranged on the surface of the outdoor heat exchanger 111 in a back and forth bending manner, and is preferably arranged on the inner side surface of the outdoor heat exchanger 111, so as to effectively avoid unnecessary waste of heat conveyed in the first defrosting section 121 caused by outdoor temperature, and improve defrosting efficiency. It is further preferable that the first defrosting section 121 is bent back and forth along the length direction of the outdoor heat exchanger 111 to achieve a better defrosting effect. The above-mentioned setting method is only a preferable setting method, but is not a restrictive setting method, and a technician may adjust the setting method according to actual use requirements. Such changes in the specific arrangement do not depart from the basic principle of the present invention, and it is within the scope of the present invention that the first defrosting section 121 can bring heat to the outdoor heat exchanger 111 to achieve defrosting.
Furthermore, as a preferable arrangement manner of the second defrosting section 122, the second defrosting section 122 is disposed on the base 13 in a manner of being bent and surrounded, and is preferably disposed on the inner side of the base 13, so as to effectively avoid unnecessary waste of the outdoor temperature to the heat transported in the second defrosting section 122, and improve the defrosting efficiency. The above-mentioned setting method is only a preferable setting method, but is not a restrictive setting method, and a technician may adjust the setting method according to actual use requirements. Such changes in the specific arrangement do not depart from the basic principle of the present invention, and it is within the scope of the present invention that the second defrosting section 122 can bring heat to the base 13 to defrost.
Further, the air conditioner of the present invention further includes humidity sensors 101, six humidity sensors 101 each being provided on the outdoor heat exchanger 111, and three of the humidity sensors 101 being located near the first defrosting section 121, and a controller capable of acquiring detection data of the six humidity sensors 101, and also capable of controlling an operation state of the air conditioner, such as controlling an open/close state of the check valve 123. It can be understood by those skilled in the art that the present invention does not limit the specific structure and model of the controller, and the controller may be the original controller of the air conditioner, or may be a controller separately configured to execute the control method of the present invention, and the structure and model of the controller may be set by a technician according to actual use requirements.
Referring next to fig. 2, a flow chart of the main steps of the control method of the present invention is shown. As shown in fig. 2, based on the air conditioner described in the above embodiment, the control method of the present invention mainly includes the following steps:
s1: acquiring humidity near an outdoor heat exchanger;
s2: and controlling the on-off state of the defrosting branch according to the humidity near the outdoor heat exchanger.
In step S1, the controller can obtain the humidity near the outdoor heat exchanger 111, and the humidity here may be a single-point humidity or an average value of multiple-point humidities, which is not limited and can be set by a technician according to actual use requirements.
Next, in step S2, the controller can control the on/off state of the defrost branch 12 according to the humidity near the outdoor heat exchanger 111. It should be noted that, the present invention does not limit any specific control manner for controlling the on-off state of the defrosting branch 12 according to the humidity near the outdoor heat exchanger 111, and a technician can set the on-off state according to actual use requirements; for example, the defrosting branch 12 may be controlled to be communicated when the humidity near the outdoor heat exchanger 111 satisfies a preset formula, or the defrosting branch 12 may be controlled to be communicated when the humidity near the outdoor heat exchanger 111 satisfies a preset numerical range; for another example, the first defrosting stage 121 and the second defrosting stage 122 may be controlled to communicate with each other, or the first defrosting stage 121 and the second defrosting stage 122 may be controlled to communicate with each other at the same time.
Reference is now made to fig. 3, which is a detailed step flow diagram of a preferred embodiment of the control method of the present invention. As shown in fig. 3, based on the air conditioner described in the above preferred embodiment, the preferred embodiment of the control method of the present invention specifically includes the following steps:
s101: acquiring humidity at six reference points on the outdoor heat exchanger;
s102: calculating the average value of the humidity at six reference points on the outdoor heat exchanger, and recording the average value as the humidity near the outdoor heat exchanger;
s103: if the average value of the humidity at the six reference points on the outdoor heat exchanger is greater than a first preset humidity, controlling the defrosting branch to be communicated;
s104: under the condition that the defrosting branch is communicated, the humidity near the outdoor heat exchanger is obtained again;
s105: and if the humidity near the outdoor heat exchanger obtained again is smaller than the second preset humidity, controlling the defrosting branch to be cut off after a preset time.
In step S101, the controller can acquire the humidity at six reference points through six humidity sensors 101 disposed on the outdoor heat exchanger 111, and of course, the specific setting position and the specific setting number of the reference points are not limited, and a technician can set the reference points according to actual use requirements; preferably, a part of the reference point is disposed near the first defrosting section 121, so as to effectively improve the accuracy of the detection result.
Next, in step S102, an average value of the humidity at the six reference points on the outdoor heat exchanger 111 is calculated, and is recorded as the humidity near the outdoor heat exchanger 111, so as to control the on-off state of the defrosting branch 12, i.e., the on-off state of the check valve 123 accordingly. In the preferred embodiment, the defrosting branch 12 can be connected by controlling the opening of the check valve 123, and when the defrosting branch 12 is connected, the refrigerant flows through both the first defrosting section 121 and the second defrosting section 122.
Further, in step S103, if the average value of the humidity at the six reference points on the outdoor heat exchanger 111 is greater than the first preset humidity, the defrosting branch 12 is controlled to be connected, that is, the check valve 123 is controlled to be opened; otherwise, the defrost branch 12 continues to be kept in the shut-off state, i.e. the check valve 123 remains closed. It should be noted that, the specific value of the first preset humidity is not limited in any way, and a technician can set the value according to actual use requirements; preferably, the first preset humidity is set to 67%, so that the accuracy of judgment can be improved to the greatest extent.
Further, in step S104, in the case where the defrosting branch 12 is communicated, the humidity near the outdoor heat exchanger 111 is acquired again, so that the controller can selectively control the defrosting branch 12 to be turned off according to the acquired humidity near the outdoor heat exchanger 111. It should be noted that the humidity described herein may be the humidity of a single reference point, or may be the average value of the humidities of a plurality of reference points, which is not limiting, and the technician may set the humidity according to the actual use requirement.
Finally, in step S105, if the humidity near the outdoor heat exchanger 111 obtained again is smaller than the second preset humidity, after the preset time period, the check valve 123 is controlled to be closed, that is, the defrosting branch 12 is controlled to be cut off. Of course, although the preferred embodiment controls the defrosting branch 12 to be cut off after the preset time period, this is only a preferred control method to further reduce the humidity, and thus effectively reduce the risk of frost formation. It should be noted that, the specific values of the second preset humidity and the preset time period are not limited, and a technician can set the values according to actual use requirements; as a preferable setting, the second preset humidity is smaller than the first preset humidity, and the preset time period is set to 5 minutes.
Further, it is further preferable that, in step S104, the controller is capable of acquiring the humidity at a plurality of reference points on the outdoor heat exchanger 111, and selecting the humidity corresponding to the reference point at which the humidity is highest as the humidity near the outdoor heat exchanger 111. Next, in step S105, if the humidity corresponding to the reference point with the highest humidity is less than the second preset humidity, after the preset time period, the check valve 123 is controlled to be closed, that is, the defrosting branch 12 is controlled to be cut off, so as to reduce the risk of frost to the maximum extent.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method of an air conditioner is characterized in that an outdoor unit of the air conditioner comprises an outdoor heat exchange branch and a defrosting branch connected with the outdoor heat exchange branch,
the outdoor heat exchange branch is provided with a compressor and an outdoor heat exchanger,
one end of the defrosting branch is connected to the exhaust end of the compressor, the other end of the defrosting branch is connected to the air inlet end of the compressor, and at least one part of the defrosting branch is arranged on the surface of the outdoor heat exchanger;
the control method comprises the following steps:
acquiring humidity near the outdoor heat exchanger;
and controlling the on-off state of the defrosting branch according to the humidity near the outdoor heat exchanger.
2. The control method according to claim 1, wherein the step of "acquiring the humidity in the vicinity of the outdoor heat exchanger" specifically includes:
acquiring humidity at a plurality of reference points on the outdoor heat exchanger;
calculating the average value of the humidity at a plurality of reference points on the outdoor heat exchanger, and recording the average value as the humidity near the outdoor heat exchanger;
the step of controlling the on-off state of the defrosting branch according to the humidity near the outdoor heat exchanger specifically comprises the following steps:
and controlling the on-off state of the defrosting branch according to the average value of the humidity at a plurality of reference points on the outdoor heat exchanger.
3. The control method of claim 2, wherein a portion of the plurality of reference points are located near the defrost branch.
4. The control method according to claim 2, wherein the step of controlling the on-off state of the defrosting branch according to the average value of the humidity at the plurality of reference points on the outdoor heat exchanger specifically comprises:
and if the average value of the humidity at a plurality of reference points on the outdoor heat exchanger is greater than a first preset humidity, controlling the defrosting branch to be communicated.
5. The control method according to claim 4, characterized in that the first preset humidity is 67%.
6. The control method according to any one of claims 1 to 5, characterized by further comprising:
under the condition that the defrosting branch is communicated, acquiring the humidity near the outdoor heat exchanger again;
and selectively controlling the defrosting branch to be cut off according to the obtained humidity near the outdoor heat exchanger.
7. The control method according to claim 6, wherein the step of selectively controlling the defrosting branch to be turned off according to the retrieved humidity in the vicinity of the outdoor heat exchanger specifically includes:
and if the humidity near the outdoor heat exchanger obtained again is smaller than a second preset humidity, controlling the defrosting branch to be cut off.
8. The control method according to claim 7, wherein the step of controlling the defrosting branch to be turned off if the reacquired humidity near the outdoor heat exchanger is less than a second preset humidity specifically comprises:
and if the humidity near the outdoor heat exchanger obtained again is smaller than a second preset humidity, controlling the defrosting branch to be cut off after a preset time.
9. The control method according to claim 8, wherein the preset time period is 5 minutes.
10. An air conditioner characterized by comprising a controller capable of executing the control method of any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111265933.XA CN114060909A (en) | 2021-10-28 | 2021-10-28 | Air conditioner and control method thereof |
| PCT/CN2022/099078 WO2023071227A1 (en) | 2021-10-28 | 2022-06-16 | Air conditioner and control method therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111265933.XA CN114060909A (en) | 2021-10-28 | 2021-10-28 | Air conditioner and control method thereof |
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| WO (1) | WO2023071227A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023071227A1 (en) * | 2021-10-28 | 2023-05-04 | 青岛海尔空调器有限总公司 | Air conditioner and control method therefor |
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| JP5974968B2 (en) * | 2013-04-26 | 2016-08-23 | 三菱電機株式会社 | Air conditioner outdoor unit |
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| CN108800436A (en) * | 2018-04-25 | 2018-11-13 | 广东美的制冷设备有限公司 | Air conditioner, Defrost method and computer readable storage medium |
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