CN107314476B - Air conditioning unit and control method thereof - Google Patents
Air conditioning unit and control method thereof Download PDFInfo
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- CN107314476B CN107314476B CN201710391836.2A CN201710391836A CN107314476B CN 107314476 B CN107314476 B CN 107314476B CN 201710391836 A CN201710391836 A CN 201710391836A CN 107314476 B CN107314476 B CN 107314476B
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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
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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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)
- Air Conditioning Control Device (AREA)
Abstract
The application provides an air conditioning unit and a control method of the air conditioning unit. Wherein, air conditioning unit includes the off-premises station and a plurality of indoor set of being connected with the off-premises station, and air conditioning unit still includes: the connecting pipeline is used for connecting the outdoor unit and the plurality of indoor units and comprises a plurality of connecting pipe sections which are arranged in one-to-one correspondence with the plurality of indoor units, and each connecting pipe section is provided with an electronic expansion valve; the auxiliary control device is connected with the electronic expansion valve; when part of indoor units are in a closed state, the auxiliary control device is used for controlling the working state of the electronic expansion valve corresponding to the indoor unit in the closed state. The application can solve a series of problems in the prior art, which are caused by disconnection of part of indoor units and a power supply and affect the reliable operation and the service life of the compressor.
Description
Technical Field
The application relates to the technical field of air conditioners, in particular to an air conditioner unit and a control method of the air conditioner unit.
Background
The multi-split air conditioning system comprises an outdoor unit and a plurality of indoor units which are arranged in parallel, and a refrigerant circulates in a connecting pipeline between the indoor units and the outdoor unit. The electronic expansion valve is arranged on a connecting pipeline between the indoor unit and the outdoor unit, and the opening degree of the electronic expansion valve determines the flow rate of the refrigerant flowing into the indoor unit.
The power supply of the indoor unit and the power supply of the outdoor unit are generally separately powered. Each indoor unit of the multi-split air conditioning system is provided with an independent power supply. According to the use habits of different users, the power supply of the indoor unit may be turned off when the indoor unit is out or not in use. Therefore, in the multi-split air conditioning system, a part of indoor units are in a closed state, and the other part of indoor units are in an operating state.
The electronic expansion valve is connected with the control main board of the indoor unit, when the indoor unit is powered off, the control main board can not control the working state of the electronic expansion valve any more, and the working state of the electronic expansion valve can not be adapted to the running state of the compressor.
If a part of the indoor units are in an operation state and the electronic expansion valves corresponding to the indoor units in a closed state are in an open state, then refrigerant enters the evaporator of the indoor unit disconnected from the power supply. Because the evaporator of the indoor unit in the closed state is not operated at this time, the refrigerant entering the indoor unit cannot be evaporated into a gaseous state, and the refrigerant is still in a liquid state when flowing back to the compressor, so that the liquid returning of the compressor can be caused, and the reliable operation of the compressor is affected.
In addition, during the operation of the indoor unit, the refrigerant takes away a part of the lubricating oil of the compressor. If the electronic expansion valve corresponding to the indoor unit in the closed state is in the closed state, the compressor cannot recover the lubricating oil, and the service life of the compressor is influenced.
Disclosure of Invention
The application mainly aims to provide an air conditioning unit and a control method of the air conditioning unit, which are used for solving a series of problems in the prior art that the reliable operation and the service life of a compressor are influenced due to the fact that part of indoor units are in a closed state.
In order to achieve the above object, according to one aspect of the present application, there is provided an air conditioning unit including an outdoor unit and a plurality of indoor units connected to the outdoor unit, the air conditioning unit further comprising: the connecting pipeline is used for connecting the outdoor unit and the plurality of indoor units and comprises a plurality of connecting pipe sections which are arranged in one-to-one correspondence with the plurality of indoor units, and each connecting pipe section is provided with an electronic expansion valve; the auxiliary control device is connected with the electronic expansion valve; when part of indoor units are in a closed state, the auxiliary control device is used for controlling the working state of the electronic expansion valve corresponding to the indoor unit in the closed state.
Further, the auxiliary control devices are in one-to-one correspondence with the electronic expansion valves; wherein each auxiliary control device includes: the control board is connected with the corresponding electronic expansion valve to control the working state of the electronic expansion valve; the built-in power supply is provided with a first state for supplying power to the control panel and a second state disconnected with the control panel, and when the built-in power supply is in the first state, the control panel controls the working state of the electronic expansion valve.
Further, the built-in power supply is a storage battery, and when the indoor unit is in the running state, the built-in power supply is in the second state, and the power supply circuit of the indoor unit charges the built-in power supply; when the indoor unit is in a closed state, the built-in power supply is in a first state, and the built-in power supply supplies power to the control panel.
Further, the auxiliary control device further comprises a charging loop and a discharging loop, the air conditioning unit further comprises a switching part for enabling the auxiliary control device to switch between the charging loop and the discharging loop, when the indoor unit is in a closed state, the switching part enables the discharging loop to be communicated, and when the indoor unit is in an operating state, the switching part enables the charging loop to be communicated.
Further, the switching section includes: the first static contact is connected with an external power supply; the second fixed contact is connected with the control board; the first end of the moving contact is connected with a built-in power supply, and the second end of the moving contact is selectively connected with one of the first fixed contact and the second fixed contact.
Further, the air conditioning unit further comprises a detection device for detecting whether the compressor of the outdoor unit is in an oil return state, the outdoor unit and the auxiliary control device are both connected with the detection device, and the auxiliary control device controls the working state of the electronic expansion valve according to the detection result of the detection device.
According to another aspect of the present application, there is provided a control method of an air conditioning unit including an outdoor unit, a plurality of indoor units connected to the outdoor unit, and connection pipes for connecting the outdoor unit and the plurality of indoor units, the connection pipes including a plurality of connection pipe sections provided in one-to-one correspondence with the plurality of indoor units, each connection pipe section being provided with an electronic expansion valve, the control method including: detecting whether some indoor units in the plurality of indoor units are in a closed state; when detecting that part of indoor units are in a closed state, the auxiliary control device is used for controlling the working state of the electronic expansion valve corresponding to the indoor units in the closed state.
Further, the air conditioning unit further includes a detection device connected to both the outdoor unit and the auxiliary control device, and the step of controlling the working state of the electronic expansion valve corresponding to the indoor unit in the closed state by using the auxiliary control device includes: detecting whether the compressor of the outdoor unit is in an oil return state by using a detection device; when the compressor of the outdoor unit is detected to be in an oil return state, the electronic expansion valve corresponding to the indoor unit in a closed state is controlled to be opened by a preset oil return angle; when the compressor of the outdoor unit is detected not to be in the oil return state, the electronic expansion valve corresponding to the indoor unit in the closed state is controlled to be in the closed state.
Further, the step of controlling the electronic expansion valve corresponding to the indoor unit in the closed state to open a preset oil return angle comprises the following steps: and after the electronic expansion valve is controlled to open a preset oil return angle and the preset oil return angle lasts for a preset time, the electronic expansion valve is closed.
Further, before the step of detecting whether the compressor of the outdoor unit is in the oil return state by using the detecting device, the control method further includes: detecting whether the detecting device is connected with the outdoor unit; when the detection device is detected to be in disconnection with the outdoor unit, the electronic expansion valve is controlled to be in a closed state.
By applying the technical scheme of the application, when part of indoor units are in a closed state and other indoor units are in an open state, the auxiliary control device can be used for controlling the working state of the electronic expansion valve corresponding to the indoor unit in the closed state so as to enable the working state of the electronic expansion valve to be matched with the running state of the compressor of the outdoor unit, thus not only opening the electronic expansion valve to realize oil return of the compressor, but also closing the electronic expansion valve to avoid liquid return of the compressor, thereby improving the running reliability of the compressor and prolonging the service life of the compressor.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 shows a schematic structural view of an embodiment of a prior art air conditioning unit;
fig. 2 shows a partial schematic structure of an embodiment of an air conditioning unit according to the present application; and
fig. 3 is a schematic diagram illustrating a structure of a switching part in the air conditioning unit of fig. 2.
Wherein the above figures include the following reference numerals:
10. an outdoor unit; 20. an indoor unit; 30. an electronic expansion valve; 40. an auxiliary control device; 41. a control board; 42. a built-in power supply; 43. a switching section; 44. a charge and discharge management chip; 431. a first stationary contact; 432. a second stationary contact; 433. a moving contact; 50. a detection device; 60. an external power source.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
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. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. 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.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
The application provides an air conditioning unit and a control method of the air conditioning unit. Specifically, the air conditioning unit is a multi-split air conditioning unit.
As shown in fig. 1, in the embodiment of the present application, the air conditioning unit includes an outdoor unit 10 and a plurality of indoor units 20 connected to the outdoor unit 10.
In the embodiment of the application, in order to solve a series of problems affecting the reliable operation and the service life of the compressor caused by that part of indoor units are in a closed state in the prior art, the air conditioner unit is improved, and the following specific description is provided:
as shown in fig. 1, in the embodiment of the present application, the air conditioning unit further includes a connection pipe for connecting the outdoor unit 10 and the plurality of indoor units 20. The connecting pipeline comprises a plurality of connecting pipe sections which are arranged in one-to-one correspondence with the indoor units 20, and each connecting pipe section is provided with an electronic expansion valve 30. As shown in fig. 2, the air conditioning unit further includes an auxiliary control device 40, and the auxiliary control device 40 is connected to the electronic expansion valve 30. When a part of indoor units 20 are in the closed state, the auxiliary control device 40 is used for controlling the working state of the electronic expansion valve 30 corresponding to the indoor unit 20 in the closed state. In the embodiment of the present application, the working states of the electronic expansion valve 30 include an open state, a closed state, and an open preset oil return angle.
Through the arrangement, when part of the indoor units 20 are in the closed state and other indoor units 20 are in the open state, the auxiliary control device 40 can be used for controlling the working states of the electronic expansion valves 30 corresponding to the indoor units 20 in the closed state, so that the working states of the electronic expansion valves 30 are matched with the running states of the compressors, the electronic expansion valves 30 can be opened to realize compressor oil return, and the electronic expansion valves 30 can be closed to avoid compressor liquid return, thereby improving the running reliability of the compressors and prolonging the service lives of the compressors.
Specifically, on the one hand, the auxiliary control device 40 can control the electronic expansion valve 30 corresponding to the indoor unit 20 in the closed state to be closed, so that the refrigerant does not enter the indoor unit 20 in the closed state, and the problem that the refrigerant cannot evaporate after entering the indoor unit 20 to cause liquid return of the compressor can be avoided, thereby improving the reliability of operation of the compressor.
Further, the auxiliary control device 40 is used to control the electronic expansion valve 30 corresponding to the indoor unit 20 in the closed state to be closed, so that the problem that the refrigerant flows through the evaporator of the indoor unit 20 in the closed state to cause condensation, frost or water leakage caused by frost cracking of the evaporator can be avoided. In addition, since the electronic expansion valve 30 corresponding to the indoor unit 20 in the closed state is in the closed state, the refrigerant which would enter the indoor unit 20 can be distributed to other indoor units 20 in the running state, so that the refrigerating or heating effect of other indoor units 20 in the running state is improved, and the energy efficiency of the air conditioning unit is further improved.
On the other hand, the auxiliary control device 40 can also control the electronic expansion valve 30 to be opened during oil return of the compressor, so that the compressor can recover the lubricating oil carried away by the refrigerant, thereby prolonging the service life of the compressor. Therefore, when more indoor units 20 are in a closed state in the air conditioning unit, the refrigerant takes away a large amount of lubricating oil, and the electronic expansion valve 30 corresponding to the indoor unit 20 in the closed state is closed, so that the compressor cannot recover the lubricating oil taken away by the refrigerant, and the phenomenon that the compressor lacks lubrication is avoided.
In the embodiment of the present application, the auxiliary control devices 40 are plural, and the plural auxiliary control devices 40 are connected to the plural electronic expansion valves 30 in a one-to-one correspondence. As shown in fig. 2, each auxiliary control device 40 includes a control board 41 and a built-in power supply 42. The control board 41 is connected with the corresponding electronic expansion valve 30 to control the operating state of the electronic expansion valve 30. The built-in power supply 42 has a first state of supplying power to the control board 41 and a second state of being disconnected from the control board 41. When the built-in power supply 42 is in the first state, the control board 41 controls the operating state of the electronic expansion valve 30.
In the above arrangement, the plurality of auxiliary control devices 40 are connected to the plurality of electronic expansion valves 30 in a one-to-one correspondence, and each electronic expansion valve 30 can be controlled by the corresponding auxiliary control device 40 when the corresponding indoor unit 20 is closed, so that the air conditioning unit can be operated efficiently and reliably. Since the auxiliary control device 40 includes the built-in power source 42, the built-in power source 42 can supply power to the control board 41 when the indoor unit 20 is in the off state, so that the control board 41 operates to control the electronic expansion valve 30 corresponding to the indoor unit 20. Thus, when the indoor unit 20 is in the off state, even if the external power supply 60 is not provided, for example, when the user turns off the indoor main power supply, the control board 41 can be supplied with power by the power of the built-in power supply 42, and the control board 41 can be operated normally.
Specifically, when the indoor unit 20 is in the closed state, the built-in power supply 42 in the auxiliary control device 40 connected to the electronic expansion valve 30 corresponding to the indoor unit 20 is in the first state. At this time, the built-in power supply 42 is connected to the control board 41, and supplies power to the control board 41. The control board 41 starts to operate, and controls the operation state of the corresponding electronic expansion valve 30.
When the indoor unit 20 is in the operation state, the control main board of the indoor unit 20 is normally operated, and the built-in power supply 42 in the auxiliary control device 40 connected to the electronic expansion valve 30 corresponding to the indoor unit 20 is in the second state. At this time, the built-in power supply 42 is disconnected from the control board 41, the control board 41 is disconnected, the operation is stopped, and the operation state of the corresponding electronic expansion valve 30 is controlled by the control main board of the indoor unit 20.
Of course, in an alternative embodiment not shown in the drawings, the auxiliary control device 40 may be connected to the external power supply 60 in the environment of use of the user without providing the internal power supply 42.
As shown in fig. 2, in the embodiment of the present application, the control board 41 is connected to the corresponding electronic expansion valve 30 through the control main board of the indoor unit 20.
Of course, in alternative embodiments not shown in the drawings, the control panel 41 may also be directly connected to the corresponding electronic expansion valve 30.
Specifically, in the embodiment of the present application, the control board 41 is a micro control unit (Microcontroller Unit, MCU).
In an embodiment of the present application, the internal power source 42 is a battery. When the indoor unit 20 is in the operation state, the built-in power supply 42 is in the second state, and the power supply circuit of the indoor unit 20 charges the built-in power supply 42. When the indoor unit 20 is in the off state, the built-in power supply 42 is in the first state, and the built-in power supply 42 supplies power to the control board 41.
In the above arrangement, the built-in power supply 42 is set as a storage battery, so that the built-in power supply 42 can be charged and discharged, the use is convenient, and even if the external power supply 60 in the use environment of a user is powered off, the power stored by the built-in power supply 42 can be used for supplying power to the control board 41. The built-in power supply 42 is charged by the power supply circuit of the indoor unit 20 when the indoor unit 20 is in the operation state, and it is ensured that the built-in power supply 42 has sufficient electric power to supply power to the control board 41 when the indoor unit 20 is in the off state.
Of course, in alternative embodiments of the present application, the internal power source 42 may also be configured as a disposable battery.
In an embodiment of the present application, the auxiliary control device 40 further includes a charging circuit and a discharging circuit. As shown in fig. 3, the air conditioning unit further includes a switching unit 43 for switching the auxiliary control device 40 between the charging circuit and the discharging circuit. When the indoor unit 20 is in the off state, the switching section 43 causes the discharge circuit to communicate; when the indoor unit 20 is in the operating state, the switching section 43 causes the charging circuit to communicate.
With the above arrangement, the switching unit 43 facilitates switching the auxiliary control device 40 between the charging circuit and the discharging circuit, and adapts the charging/discharging state of the internal power supply 42 to the operating state of the indoor unit 20.
Specifically, when the indoor unit 20 is in the operation state, the switching unit 43 causes the charging circuit to be on, the discharging circuit to be off, the internal power source 42 to be in the second state, and the auxiliary control device 40 can perform the charging operation on the internal power source 42 using the charging circuit. When the indoor unit 20 is in the off state, the switching unit 43 causes the discharge circuit to be on, the charge circuit to be off, the internal power supply 42 is in the first state, and the auxiliary control device 40 can supply power to the control board 41 by using the discharge circuit.
In addition, when the built-in power supply 42 is charged, the discharging circuit is disconnected, so that the control board 41 does not work, and only one of the auxiliary control device 40 and the control main board of the indoor unit 20 can control the corresponding electronic expansion valve 30 at the same time, thereby improving the reliability of the air conditioning unit.
Specifically, the auxiliary control device 40 further includes a charge/discharge management chip 44 connected to the internal power supply 42, and the charge/discharge management chip 44 is configured to control the internal power supply 42 to charge in the second state and discharge in the first state.
Before charging the built-in power supply 42, the charge and discharge management chip 44 may first detect the amount of power of the built-in power supply 42. When the amount of electricity of the built-in power supply 42 is smaller than the first predetermined value, the switching section 43 controls the charging circuit to communicate.
This makes it possible to charge the internal power supply 42 with a lower power than a predetermined power, that is, when the charging requirement is satisfied.
During the charging process of the built-in power supply 42, the charge/discharge management chip 44 can detect the amount of power of the built-in power supply 42. When it is detected that the electric quantity of the built-in power supply 42 is greater than or equal to the second predetermined value, the switching section 43 controls the charging circuit to be turned off, or the charge-discharge management chip 44 controls the built-in power supply 42 to be neither charged nor discharged until it is detected that the electric quantity of the built-in power supply 42 is less than the first predetermined value, and then the built-in power supply 42 is charged. Wherein the first predetermined value is smaller than the second predetermined value.
This may cause the power of the internal power source 42 to be powered off above a predetermined level or when full.
If the charge and discharge management chip 44 detects that the amount of power of the built-in power supply 42 does not reach the second predetermined value, but the amount of power of the built-in power supply 42 is not increased any more, the switching section 43 controls the charge circuit to be turned off.
In this way, when the charging fails, the battery is disconnected from the external power source 60, avoiding the occurrence of a hazard.
As shown in fig. 3, in the embodiment of the present application, the switching part 43 includes a first fixed contact 431, a second fixed contact 432, and a moving contact 433. The first stationary contact 431 is connected to the external power supply 60. The second stationary contact 432 is connected to the control board 41. The first end of the moving contact 433 is connected to the built-in power source 42, and the second end of the moving contact 433 is selectively connected to one of the first and second fixed contacts 431 and 432.
With the above arrangement, when the second end of the movable contact 433 is sucked with the first fixed contact 431, the built-in power source 42 is connected to the external power source 60, the switching unit 43 connects the charging circuit, and the built-in power source 42 starts charging until full. At this time, the built-in power supply 42 does not supply power to the control board 41. When the second end of the movable contact 433 is attracted to the second fixed contact 432, the built-in power source 42 communicates with the control board 41, and the switching unit 43 communicates with the discharge circuit.
Specifically, in the embodiment of the present application, the switching section 43 is a relay. The input end of the relay is connected with the control main board of the indoor unit 20, when the indoor unit 20 is disconnected with the external power supply 60, the indoor unit 20 is in a closed state, the input end of the relay is powered off, and the second end of the moving contact 433 is attracted with the second fixed contact 432. When the indoor unit 20 is connected to the external power source 60, the indoor unit 20 is in an operating state, the input end of the relay is energized, and the moving contact 433 is attracted to the first static contact 431.
In this way, the relay operation can be automatically controlled by the communication state between the external power supply 60 and the indoor unit 20, so that the charge and discharge states of the internal power supply 42 can be automatically controlled without providing an additional control device.
As shown in fig. 2, in the embodiment of the present application, the air conditioning unit further includes a detecting device 50 for detecting whether the compressor of the outdoor unit 10 is in an oil return state, and the outdoor unit 10 and the auxiliary control device 40 are connected to the detecting device 50. The auxiliary control device 40 controls the operation state of the electronic expansion valve 30 based on the result detected by the detection device 50.
In the above arrangement, the detecting means 50 may detect whether the compressor is in the oil return state, and feed back the detection result to the auxiliary control device 40. In this way, the auxiliary control device 40 can control the operation state of the electronic expansion valve 30 according to the detection result of the detection device 50.
Alternatively, as shown in fig. 2, the detecting device 50 is a communication terminal connected to the control board 41, and the detecting device 50 is connected to the control board of the outdoor unit 10, so that the operation state of the compressor is detected by exchanging data with the control board of the outdoor unit 10.
Alternatively, the detecting device 50 may be directly connected to the compressor to directly detect the operation state of the compressor.
In an embodiment of the application, a control method of an air conditioning unit comprises the following steps: detecting whether some indoor units 20 among the plurality of indoor units 20 are in a closed state; when it is detected that a part of the indoor units 20 are in the closed state, the auxiliary control device 40 is used to control the operation state of the electronic expansion valve 30 corresponding to the indoor unit 20 in the closed state.
With the above arrangement, it is first detected whether or not some of the plurality of indoor units 20 are in the closed state, and when it is detected that some of the indoor units 20 are in the closed state, the operation state of the corresponding electronic expansion valve 30 is controlled by the auxiliary control device 40. Thus, even if part of the indoor units 20 are in the closed state, the working state of the electronic expansion valve 30 corresponding to the indoor units 20 can be matched with the running state of the compressor, the electronic expansion valve 30 can be opened to realize compressor oil return, and the electronic expansion valve 30 can be closed to avoid compressor liquid return, so that the running reliability of the compressor is improved, and the service life of the compressor is prolonged.
Further, when it is detected that the indoor unit 20 in the off state is in communication with the external power supply 60, thereby resuming the operation, the auxiliary control device 40 gives up the control of the electronic expansion valve 30. Thus, it is ensured that only one of the auxiliary control device 40 and the control main board of the indoor unit 20 can control the electronic expansion valve 30 at the same time, thereby improving the reliability of the air conditioning unit.
In the embodiment of the present application, the step of controlling the operation state of the electronic expansion valve 30 corresponding to the indoor unit 20 in the closed state by using the auxiliary control device 40 includes: detecting whether the compressor of the outdoor unit 10 is in an oil return state by using the detecting device 50; when the compressor of the outdoor unit 10 is detected to be in an oil return state, the electronic expansion valve 30 corresponding to the indoor unit 20 in a closed state is controlled to be opened by a preset oil return angle; when it is detected that the compressor of the outdoor unit is not in the oil return state, the electronic expansion valve 30 corresponding to the indoor unit 20 in the closed state is controlled to be in the closed state.
With the above arrangement, the operation state of the compressor of the outdoor unit 10 is first detected by the detecting device 50, and then the operation state of the electronic expansion valve 30 is matched with the operation state of the compressor. When the compressor is detected to be in the oil return state, the electronic expansion valve 30 can be controlled to open a preset oil return angle, so that normal oil return of the compressor is realized. When the compressor is detected not to be in the oil return state, the electronic expansion valve 30 can be controlled to be closed, so that the refrigerant is prevented from entering the indoor unit 20 in the closed state, and the situation that the refrigerant cannot be evaporated after entering the indoor unit 20 to cause the liquid return of the compressor is avoided, so that the operation reliability of the compressor is improved.
In the embodiment of the present application, the step of controlling the electronic expansion valve 30 corresponding to the indoor unit 20 in the closed state to open the preset oil return angle includes: after the electronic expansion valve 30 is controlled to open a preset oil return angle for a preset time, the electronic expansion valve 30 is closed.
In the above-mentioned setting, control electronic expansion valve 30 opens the oil return angle of predetermineeing and last a predetermined time back and close electronic expansion valve 30, can make electronic expansion valve 30's opening time and the time of returning liquid phase match of compressor, can guarantee the compressor and retrieve lubricating oil, can avoid electronic expansion valve 30's opening time overlength to lead to the compressor to return liquid again.
In an embodiment of the present application, before the step of detecting whether the compressor of the outdoor unit 10 is in the oil return state by using the detecting device 50, the control method further includes: detecting whether the detecting device 50 is connected with the outdoor unit 10; when the disconnection of the sensing device 50 from the outdoor unit 10 is sensed, the electronic expansion valve 30 is controlled to be in a closed state.
With the above arrangement, if it is detected that the detecting device 50 is disconnected from the outdoor unit 10 or a fault exists, the electronic expansion valve 30 is controlled to be closed regardless of whether the compressor is in an oil return state, so that the compressor is ensured not to return liquid, and the reliable operation of the compressor is ensured.
After the step of detecting whether the compressor of the outdoor unit 10 is in the oil return state by the detecting device 50, continuing to detect whether the detecting device 50 is connected with the outdoor unit 10; when the disconnection of the sensing device 50 from the outdoor unit 10 is sensed, the electronic expansion valve 30 is controlled to be in a closed state.
That is, the auxiliary control device 40 always detects whether the detecting device 50 is connected to the outdoor unit 10 during the operation state of the electronic expansion valve 30.
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects: when part of indoor units are in a closed state and other indoor units are in an open state, the auxiliary control device can be used for controlling the working states of the electronic expansion valves corresponding to the indoor units in the closed state, so that the working states of the electronic expansion valves are adapted to the running states of the compressors, the electronic expansion valves can be opened to realize oil return of the compressors, and the electronic expansion valves can be closed to avoid liquid return of the compressors, so that the running reliability of the compressors is improved, and the service lives of the compressors are prolonged.
In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. An air conditioning unit comprising an outdoor unit (10) and a plurality of indoor units (20) connected to the outdoor unit (10), characterized in that the air conditioning unit further comprises:
the connecting pipeline is used for connecting the outdoor unit (10) and the plurality of indoor units (20), and comprises a plurality of connecting pipe sections which are arranged in one-to-one correspondence with the plurality of indoor units (20), and each connecting pipe section is provided with an electronic expansion valve (30);
an auxiliary control device (40) connected to the electronic expansion valve (30);
when part of the indoor units (20) are in a closed state, the auxiliary control device (40) is used for controlling the working state of the electronic expansion valve (30) corresponding to the indoor unit (20) in the closed state;
the auxiliary control device (40) includes:
a control board (41), wherein the control board (41) is connected with the corresponding electronic expansion valve (30) to control the working state of the electronic expansion valve (30);
a built-in power supply (42) having a first state for supplying power to the control board (41) and a second state disconnected from the control board (41), the control board (41) controlling an operation state of the electronic expansion valve (30) when the built-in power supply (42) is in the first state;
the auxiliary control device (40) further comprises a charge and discharge management chip (44) connected with the built-in power supply (42), and the charge and discharge management chip (44) is used for controlling the built-in power supply (42) to charge in a second state and discharge in a first state.
2. An air conditioning assembly according to claim 1, wherein,
the auxiliary control devices (40) are a plurality of, and the auxiliary control devices (40) are connected with the electronic expansion valves (30) in a one-to-one correspondence manner.
3. The air conditioning unit according to claim 2, wherein the built-in power supply (42) is a storage battery, the built-in power supply (42) is in the second state when the indoor unit (20) is in the operating state, and a power supply circuit of the indoor unit (20) charges the built-in power supply (42); when the indoor unit (20) is in the off state, the built-in power supply (42) is in the first state, and the built-in power supply (42) supplies power to the control board (41).
4. An air conditioning unit according to claim 3, characterized in that the auxiliary control device (40) further comprises a charging circuit and a discharging circuit, the air conditioning unit further comprising a switching portion (43) for switching the auxiliary control device (40) between the charging circuit and the discharging circuit, the switching portion (43) causing the discharging circuit to communicate when the indoor unit (20) is in the off state, and the switching portion (43) causing the charging circuit to communicate when the indoor unit (20) is in the on state.
5. The air conditioning unit according to claim 4, wherein the switching section (43) includes:
a first stationary contact (431) connected to an external power source (60);
a second stationary contact (432) connected to the control board (41);
and a moving contact (433), wherein a first end of the moving contact (433) is connected with the built-in power supply (42), and a second end of the moving contact (433) is selectively connected with one of the first fixed contact (431) and the second fixed contact (432).
6. Air conditioning unit according to any of claims 1 to 5, further comprising a detection device (50) for detecting whether the compressor of the outdoor unit (10) is in an oil return state, wherein the outdoor unit (10) and the auxiliary control device (40) are both connected to the detection device (50), and the auxiliary control device (40) controls the operation state of the electronic expansion valve (30) according to the result detected by the detection device (50).
7. The control method of an air conditioning unit, characterized in that the air conditioning unit includes an outdoor unit (10), a plurality of indoor units (20) connected with the outdoor unit (10), and a connecting pipeline for connecting the outdoor unit (10) and the plurality of indoor units (20), the connecting pipeline includes a plurality of connecting pipe sections arranged in one-to-one correspondence with the plurality of indoor units (20), and each connecting pipe section is provided with an electronic expansion valve (30), the control method includes:
detecting whether some of the indoor units (20) are in a closed state or not;
when detecting that part of the indoor units (20) are in a closed state, an auxiliary control device (40) is utilized to control the working state of the electronic expansion valve (30) corresponding to the indoor units (20) in the closed state.
8. The control method according to claim 7, wherein the air conditioning unit further includes a detection device (50) connected to both the outdoor unit (10) and the auxiliary control device (40), and the step of controlling the operation state of the electronic expansion valve (30) corresponding to the indoor unit (20) in the closed state by the auxiliary control device (40) includes:
detecting whether the compressor of the outdoor unit (10) is in an oil return state by using the detection device (50);
when the compressor of the outdoor unit (10) is detected to be in an oil return state, the electronic expansion valve (30) corresponding to the indoor unit (20) in a closed state is controlled to be opened by a preset oil return angle; when the compressor of the outdoor unit is detected not to be in an oil return state, the electronic expansion valve (30) corresponding to the indoor unit (20) in the closed state is controlled to be in the closed state.
9. The control method according to claim 8, wherein the step of controlling the electronic expansion valve (30) corresponding to the indoor unit (20) in the closed state to open a preset oil return angle includes:
and controlling the electronic expansion valve (30) to open a preset oil return angle for a preset time, and then closing the electronic expansion valve (30).
10. The control method according to claim 8, characterized in that, before the step of detecting whether the compressor of the outdoor unit (10) is in the oil return state by the detecting means (50), the control method further includes:
detecting whether the detecting device (50) is connected with the outdoor unit (10);
when the detection device (50) is detected to be disconnected from the outdoor unit (10), the electronic expansion valve (30) is controlled to be in a closed state.
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| CN108493923A (en) * | 2018-03-06 | 2018-09-04 | 珠海格力电器股份有限公司 | A kind of method of supplying power to of multi-gang air-conditioner, device, outer machine equipment and interior machine equipment |
| CN110207342B (en) * | 2019-06-24 | 2022-01-11 | 广东美的暖通设备有限公司 | Indoor unit, control circuit and control method of air conditioning unit and readable storage medium |
| CN111023272A (en) * | 2019-12-30 | 2020-04-17 | 宁波奥克斯电气股份有限公司 | Control method and device of multi-split air conditioning system and multi-split air conditioning system |
| CN112762527A (en) * | 2020-12-31 | 2021-05-07 | 青岛海尔空调电子有限公司 | Multi-split air conditioning system and power-off control method thereof |
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