CN112050381A - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
CN112050381A
CN112050381A CN202010486736.XA CN202010486736A CN112050381A CN 112050381 A CN112050381 A CN 112050381A CN 202010486736 A CN202010486736 A CN 202010486736A CN 112050381 A CN112050381 A CN 112050381A
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CN
China
Prior art keywords
compressor
sleep state
air conditioner
rotation speed
temperature
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Pending
Application number
CN202010486736.XA
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Chinese (zh)
Inventor
上野圆
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Sharp Corp
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Sharp Corp
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Publication date
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Publication of CN112050381A publication Critical patent/CN112050381A/en
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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
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • 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
    • F24F11/56—Remote control
    • F24F11/58—Remote control using Internet communication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • 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

Abstract

An air conditioner of the present invention determines whether a compressor is in a sleep state at the start of a heating operation, and when it is determined that the compressor is not in the sleep state, an indoor fan is raised to a target rotation speed at a first change rate (R1), and when it is determined that the compressor is in the sleep state, the indoor fan is started to the target rotation speed at a second change rate (R2), wherein the second change rate (R2) is slower than the first change rate (R1).

Description

Air conditioner
Technical Field
The present invention relates to an air conditioner.
Background
An air conditioner using a refrigeration cycle (heat pump cycle) operates a compressor to circulate a refrigerant in the cycle. In the compressor, lubricating oil is injected to improve the operation of the working parts.
During operation of the compressor, a portion of the oil is dissolved in the refrigerant and flows out to the outside of the compressor together with the refrigerant. The oil flowing out to the outside of the compressor returns to the compressor again after circulation, but the time until the oil returns is not short. Therefore, if the amount of oil that is dissolved in the refrigerant and flows out of the compressor is large, the oil may run short in the compressor.
The amount of oil dissolved in the refrigerant depends to a large extent on the temperature, the lower the temperature the more oil is dissolved in the refrigerant. That is, if the temperature of the compressor is sufficiently high, the amount of oil dissolved in the refrigerant is small, and the amount of oil flowing out from the compressor also becomes small. On the other hand, when the compressor is in a sleep state, the amount of oil that is dissolved in the refrigerant and flows out of the compressor becomes large. Further, the sleep state of the compressor means a state in which the compressor does not heat up immediately after starting or the like, and the temperature of the compressor is low.
Japanese patent laid-open publication No. 2009-92337 discloses the following techniques: in an air conditioner having an aperture mechanism for branching in an indoor heat exchanger, the oil shortage of a compressor generated in a sleep state is prevented. Further, in jp 2009-92337 a, when the heating operation is started, the refrigerant is liquefied and accumulated in the indoor heat exchanger, and accordingly, the oil is also accumulated in the indoor heat exchanger, and therefore, the oil shortage of the compressor occurs.
In the air conditioner disclosed in jp 2009-92337 a, temperature sensors are disposed in the central portion and the outlet portion of the indoor heat exchanger, respectively, and the rotation speed of the indoor fan is determined so that the temperature difference between the temperature sensors is within a predetermined temperature range when the heating operation is started. The flow combiner of the indoor heat exchanger is disposed so as to be located below the refrigerant inlet pipe at the lowermost portion of the inlet portion of the indoor heat exchanger. This prevents the liquefied refrigerant from staying in the indoor heat exchanger and prevents the compressor from being oil-starved.
Disclosure of Invention
Technical problem to be solved by the invention
In japanese patent laid-open publication No. 2009-92337, the cause of the oil shortage of the compressor is the stagnation in the indoor heat exchanger, but according to the study of the inventors of the present application, the cause of the oil shortage of the compressor is not only that. Specifically, at the start-up from the sleep state of the compressor, if the rotation speed of the fan with respect to the condenser becomes large, the heat exchange amount in the condenser becomes large and the condensing pressure drops sharply. As a result, a large amount of oil is sucked from the compressor into the condenser together with the refrigerant, and an oil shortage occurs in the compressor.
In the air conditioner, when the air volume is set by the user, it is preferable to increase the air volume to the set air volume as quickly as possible from the viewpoint of comfort. However, as described above, if the air volume is too large at the time of starting in the sleep state, oil shortage may occur. In the air conditioner disclosed in japanese patent application laid-open No. 2009-92337, when the heating operation is started from the sleep state, the indoor fan is considered to be stopped or rotated at a low speed at the lowest rotation speed until it is determined that the sleep state is released. Therefore, the time for which the indoor fan is stopped or rotated at a low speed becomes long, which causes discomfort to the user.
An aspect of the present invention is made in view of the above problems, and an object of the present invention is to provide an air conditioner capable of improving user comfort while maintaining reliability of a compressor.
Means for solving the problems
In order to solve the above problem, an air conditioner according to a first aspect of the present invention includes a determination unit that determines whether or not a compressor is in a sleep state at a start of a heating operation, wherein when the determination unit determines that the compressor is not in the sleep state, an indoor fan is increased to a target rotation speed at a first change rate, and when the determination unit determines that the compressor is in the sleep state, an indoor fan is increased to the target rotation speed at a second change rate, which is slower than the first change rate.
According to the above configuration, in the case where the compressor is in the sleep state, the rate of change of the indoor fan is slower than in the case where the compressor is not in the sleep state. Therefore, even when the air volume set by the user is large, the time required to achieve the air volume becomes longer than that in the case where the user is not in a sleep state. That is, the temperature of the compressor can be raised to release the sleep state before the air volume of the indoor fan becomes large (the rotation speed becomes large), and the oil shortage in the compressor can be prevented even when the heating operation is started from the sleep state of the compressor.
In the above start-up control, the rotation speed of the indoor fan is increased at the second rate of change even while the compressor is in the sleep state, and therefore, even in a stage before the sleep state of the compressor is released, the air volume of the indoor fan can be increased to such an extent that the oil shortage in the compressor does not occur, and the comfort of the air conditioner can be improved.
In order to solve the above problem, an air conditioner according to a second aspect of the present invention includes a determination unit that determines whether or not a compressor is in a sleep state at the start of a heating operation, and limits a maximum rotation speed of an indoor fan to a first rotation speed when the determination unit determines that the compressor is not in the sleep state, and limits the maximum rotation speed of the indoor fan to a second rotation speed that is smaller than the first rotation speed when the determination unit determines that the compressor is in the sleep state.
According to the above configuration, when the compressor is in the sleep state, the maximum rotation speed of the indoor fan is limited to a smaller rotation speed than when not in the sleep state. Therefore, even when the air volume set by the user is large, the air volume is restricted to be small until the sleep state is released, and the oil shortage in the compressor can be prevented even when the heating operation is started from the sleep state of the compressor.
In the above start-up control, the rotation speed of the indoor fan is increased to the second rotation speed even while the compressor is in the sleep state, and therefore, even in a stage before the sleep state of the compressor is released, the air volume of the indoor fan can be increased to such an extent that the oil shortage in the compressor does not occur, and the comfort of the air conditioner can be improved.
Further, the following configuration is possible: in the air conditioner, the determination unit determines that the air conditioner is in the sleep state when the temperature of the outdoor heat exchanger < the outside air temperature + Δ T1 is satisfied with respect to a predetermined temperature threshold Δ T1.
Further, the following configuration is possible: in the air conditioner, the determination unit determines that the air conditioner is in the sleep state when the discharge temperature of the compressor < the outside air temperature + Δ T2 is satisfied with respect to the predetermined temperature threshold Δ T2.
Further, the following configuration is possible: in the air conditioner, the determination unit may compare an elapsed time from a previous operation end time to a current start time with a first threshold time, and determine that the air conditioner is in the sleep state if the elapsed time is equal to or longer than the first threshold time.
Further, the following configuration is possible: in the air conditioner, the determination unit determines that the indoor unit is in the sleep state if the power supply from the indoor unit to the outdoor unit is switched during the current startup.
Further, the following configuration is possible: in the air conditioner, the determination unit may determine that the air conditioner is in a sleep state if the discharge temperature of the compressor is lower than a room temperature.
Further, the following configuration is possible: the air conditioner may be configured to limit the maximum rotation speed of the indoor fan to a first rotation speed when the determination unit determines that the compressor is not in the sleep state, and to limit the maximum rotation speed of the indoor fan to a second rotation speed smaller than the first rotation speed during a period from a current start to a lapse of a second threshold time, the second threshold time being a time elapsed from the start to a release of the sleep state when the compressor is started from the sleep state before the current start, and the stored elapsed time being the second threshold time at the current start.
Further, the following configuration is possible: the above-mentioned air conditioner is connected to a server via the internet, the server stores, as data, the first threshold time corresponding to a state parameter of the air conditioner, and when the air conditioner is started, the first threshold time corresponding to the state parameter at the time of start is read and set from the server.
Further, the following configuration is possible: in the air conditioner, the determination unit may determine that the indoor unit is in the sleep state when the temperature of the electric component in the indoor unit is lower than a reference value.
Effects of the invention
An air conditioner according to an aspect of the present invention can prevent oil shortage in a compressor even when a heating operation is started from a sleep state of the compressor by reducing a rate of change of an indoor fan (or limiting a maximum rotation speed of the indoor fan to a small rotation speed) when the compressor is in the sleep state as compared with a case where the compressor is not in the sleep state. Further, even in the stage before the sleep state of the compressor is released, the air volume of the indoor fan can be increased to such an extent that the shortage of the oil in the compressor does not occur, and thus the comfort of the air conditioner can be improved.
Drawings
Fig. 1 is a schematic configuration diagram of an air conditioner according to a first embodiment.
Fig. 2 is a flowchart showing the start-up control of the air conditioner according to the first embodiment.
Fig. 3 is a diagram illustrating the control of the rotation speed of the indoor fan in the start-up control of fig. 2.
Fig. 4 is a flowchart showing a modification of the start-up control of the air conditioner according to the first embodiment.
Fig. 5 is a flowchart showing another modification of the start-up control of the air conditioner according to the first embodiment.
Fig. 6 is a schematic configuration diagram of an air conditioner according to a second embodiment.
Fig. 7 is a diagram illustrating the control of the rotation speed of the indoor fan in the start-up control of fig. 6.
Fig. 8 is a flowchart showing the start-up control of the air conditioner according to the third embodiment.
Fig. 9 is a flowchart showing a modification of the start-up control of the air conditioner according to the third embodiment.
Fig. 10 is a flowchart showing the start-up control of the air conditioner according to the fourth embodiment.
Fig. 11 is a flowchart showing the start-up control of the air conditioner according to the fifth embodiment.
Detailed Description
[ first embodiment ]
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a schematic configuration diagram of an air conditioner 10 according to a first embodiment, and shows a refrigeration cycle applied to the air conditioner 10.
The air conditioner 10 includes an indoor unit (indoor unit) 100 and an outdoor unit (outdoor unit) 110. In the path of the refrigeration cycle in the air conditioner 10, the indoor unit 100 side is provided with an indoor heat exchanger 101, and the outdoor unit 110 side is provided with a compressor 111, an outdoor heat exchanger 112, a four-way valve 113, and an expansion valve 114. The indoor unit 100 includes an indoor fan 102 for sending the air heat-exchanged by the indoor heat exchanger 101 to the indoor, and the outdoor unit 110 includes an outdoor fan 115 for sending the air to the outdoor heat exchanger 112. Although not shown in detail in fig. 1, the air conditioner 10 is suitably provided with a temperature sensor that detects the temperature of each part in the refrigeration cycle as needed.
The four-way valve 113 switches the refrigerant circulation direction in accordance with the heating/cooling operation of the air conditioner 10 (fig. 1 shows a state during the heating operation). In the heating operation, the refrigerant circulates through the compressor 111, the four-way valve 113, the indoor heat exchanger 101, the expansion valve 114, the outdoor heat exchanger 112, the four-way valve 113, and the compressor 111 in this order. That is, during the heating operation, the indoor heat exchanger 101 functions as a condenser, and the outdoor heat exchanger 112 functions as an evaporator. On the other hand, in the cooling operation, the refrigerant circulates through the compressor 111, the four-way valve 113, the outdoor heat exchanger 112, the expansion valve 114, the indoor heat exchanger 101, the four-way valve 113, and the compressor 111 in this order. That is, in the cooling operation, the outdoor heat exchanger 112 functions as a condenser, and the indoor heat exchanger 101 functions as an evaporator.
Fig. 2 is a flowchart illustrating the start-up control at the start of the operation of the air conditioner 10 according to the first embodiment. The operation of the air conditioner 10 at this time is a heating operation.
When the air conditioner 10 starts to operate, in the start-up control of the first embodiment, first, the control unit (corresponding to the determination unit of the claims, not shown) of the air conditioner 10 determines whether or not the compressor 111 is in the sleep state (S1). At this time, the temperature of the outdoor heat exchanger 112 (outdoor heat exchanger temperature) is compared with the outside air temperature, and if the outdoor heat exchanger temperature is close to the outside air temperature, it is determined that the sleep state is established. As a specific example, when the following equation is satisfied for a predetermined temperature threshold Δ T1 set in advance, it is determined that the sleep state is present.
Outdoor heat exchanger temperature < outside air temperature + Δ T1
In addition, the value of the temperature threshold Δ T1 at this time is preferably a variable value rather than a fixed value. As a specific example, it is assumed that the value of the temperature threshold Δ T1 varies depending on the outside air temperature, and the value of the temperature threshold Δ T1 is small when the outside air temperature is low, and the value of the temperature threshold Δ T1 is large when the outside air temperature is high. The correspondence relationship between the outside air temperature and the temperature threshold value Δ T1 may be tabulated in advance and stored in a storage unit (not shown) of the air conditioner 10.
When the compressor 111 is not in the sleep state (no in S1), the start operation of the air conditioner 10 includes the start of the compressor 111 (S2) and the start of the indoor fan 102 (S3). Then, with respect to the start of the indoor fan 102 in S3, the rotation speed of the indoor fan 102 is controlled to increase to the target rotation speed at the first rate of change R1.
Here, the rotational speed control of the indoor fan 102 is described with reference to fig. 3. When the indoor fan 102 is raised to the target rotation speed, normally, the rotation speed of the indoor fan 102 does not rise all at once to the target rotation speed, but changes at a predetermined rate of change. In the example shown in fig. 3, the rotation speed of the indoor fan 102 may be controlled at a plurality of levels, and can be increased stepwise so that the rotation speed is increased one step at a time. Here, as shown in the solid line graph in fig. 3, the first rate of change R1 is set to a rate of change that increases the rotation speed by one step per unit time Δ t 1. The target rotation speed here is a rotation speed corresponding to the set air volume when the air volume is set by the user, and a rotation speed corresponding to the air volume automatically set in the air conditioner 10 when the air volume is set to the automatic air volume.
When the compressor 111 is in the sleep state (yes in S1), the start operation of the air conditioner 10 includes the start of the compressor 111 (S4) and the start of the indoor fan 102 (S5). The start-up of the compressor 111 in S4 may be the same as the start-up of the compressor 111 in S2. Then, with respect to the start of the indoor fan 102 in S5, the rotation speed of the indoor fan 102 is controlled to increase to the target rotation speed at the second rate of change R2, which is slower than the first rate of change R1. Here, as shown in the broken line diagram in fig. 3, the second rate of change R2 is a rate of change that increases the rotation speed by one step per unit time Δ t2, and is set to Δ t2 > Δ t 1.
As described above, if the rotation speed of the indoor fan 102 is increased when the heating operation is started from the sleep state of the compressor 111, a large amount of oil is sucked from the compressor 111 to the indoor heat exchanger 101 together with the refrigerant, and thus the oil shortage in the compressor 111 is likely to occur.
In contrast, in the start-up control according to the first embodiment, when the compressor 111 is in the sleep state, the rate of change of the indoor fan 102 is slower than when it is not in the sleep state. Therefore, even when the air volume set by the user is large, the time required to achieve the air volume becomes longer than that in the case where the user is not in a sleep state. That is, before the air volume of the indoor fan 102 becomes large (the rotation speed becomes large), the temperature of the compressor 111 may be raised to release the sleep state. Thus, even when the heating operation is started from the sleep state of the compressor 111, the oil shortage in the compressor 111 can be prevented.
In the start-up control according to the first embodiment, the rotation speed of the indoor fan 102 is increased at the second rate of change R2 even while the compressor 111 is in the sleep state. That is, even in the stage before the sleep state of the compressor 111 is released, the air volume of the indoor fan 102 is increased to such an extent that the oil shortage in the compressor 111 does not occur, and therefore, the heating capability is improved and the comfort of the air conditioner 10 can be improved as compared with the conventional start control.
Fig. 4 is a flowchart showing a modification of the start-up control at the start of operation of the air conditioner 10 according to the first embodiment. The start control shown in fig. 4 is control in which the step of S1 of the start control shown in fig. 2 is replaced with the step of S1'.
In step S1' of the start control shown in fig. 4, the determination as to whether the compressor 111 is in the sleep state is made based on the discharge temperature of the compressor 111 instead of the outdoor heat exchanger temperature. That is, the discharge temperature of the compressor 111 is compared with the outside air temperature, and if the discharge temperature is close to the outside air temperature, it is determined that the sleep state is established. As a specific example, when the following equation is satisfied for a predetermined temperature threshold Δ T2 set in advance, it is determined that the sleep state is present.
Discharge temperature < outside air temperature + Δ T2
The value of the temperature threshold Δ T2 at this time is preferably a variable value rather than a fixed value, as in the case of the temperature threshold Δ T1. As a specific example, it is assumed that the value of the temperature threshold Δ T2 varies depending on the outside air temperature, and that the value of the temperature threshold Δ T2 is large when the outside air temperature is low, and the value of the temperature threshold Δ T2 is small when the outside air temperature is high.
Fig. 5 is a flowchart showing another modification of the start-up control at the start of the operation of the air conditioner 10 according to the first embodiment. The start-up control shown in fig. 5 is control including steps of both S1 of the start-up control shown in fig. 2 and S1' of the start-up control shown in fig. 4.
That is, in the start-up control shown in FIG. 5, the start-up control is executed
Outdoor heat exchanger temperature < outside air temperature + Δ T1, an
Discharge temperature < outside air temperature + Δ T2
If both are true (yes in S1 and S1'), it is determined that the sleep state is present. However, the present invention is not limited thereto.
At an outdoor heat exchanger temperature < outside air temperature + Δ T1, an
If any one of the discharge temperatures < outside air temperature + Δ T2 is satisfied (yes in S1 or S1'), it may be determined that the vehicle is in the sleep state.
[ second embodiment ]
Fig. 6 is a flowchart illustrating the start-up control at the start of the operation of the air conditioner 10 according to the second embodiment. In the start control according to the second embodiment, the same steps as those in the start control according to the first embodiment are assigned the same step numbers, and detailed description thereof is omitted.
When the air conditioner 10 starts to operate, in the start control of the second embodiment, it is first determined whether or not the compressor 111 is in the sleep state (S1). This determination is made as the step of S1 in the start-up control of fig. 2, but may be made as the step of S1 'in the start-up control of fig. 4, or may be made by using two steps S1 and S1' as in the start-up control of fig. 5. This is also the same as the step of S16 described later.
When the compressor 111 is not in the sleep state (no in S1), the start operation of the air conditioner 10 includes the start of the compressor 111 (S2) and the start of the indoor fan 102 (S13). In the operation control of the indoor fan 102, the maximum rotation speed is set to the rotation speed of the indoor fan 102, and the indoor fan 102 is controlled so as not to exceed the maximum rotation speed. When the indoor fan 102 is activated in step S13, the maximum rotation speed of the indoor fan 102 is set to the first rotation speed N1 corresponding to the maximum air volume of the air conditioner 10.
That is, as shown in the solid line graph in fig. 7, when the indoor fan 102 is activated while the compressor 111 is not in the sleep state, for example, if the set air volume set by the user is the maximum air volume, the rotation speed of the indoor fan 102 may be increased to the first rotation speed N1 at the first rate of change R1.
When the compressor 111 is in the sleep state (yes in S1), the start operation of the air conditioner 10 includes the start of the compressor 111 (S4) and the start of the indoor fan 102 (S15). In the case where the indoor fan 102 is activated in the step of S15, the maximum rotation speed of the indoor fan 102 is set to the second rotation speed N2 that is less than the first rotation speed N1.
That is, as shown in the broken line diagram in fig. 7, when the indoor fan 102 is started while the compressor 111 is in the sleep state, for example, even if the set air volume set by the user is the maximum air volume, the rotation speed of the indoor fan 102 can only be increased to the second rotation speed N2 while the compressor 111 is in the sleep state.
After the indoor fan 102 is activated in the step of S15, the air conditioner 10 also continues to determine whether the compressor 111 is in the sleep state (S16). The judgment in S16 may be the same judgment method as S1. Here, if it is determined that the sleep state has been released (no in S16), the maximum rotation speed of the indoor fan 102 is changed to the first rotation speed N1 (S17). While the sleep state is not released (yes in S16), the maximum rotation speed of the indoor fan 102 is maintained at the second rotation speed N2 (S18). In the broken line diagram of fig. 7, time t3 represents a time point at which the sleep state is released.
In the start-up control according to the second embodiment, when the compressor 111 is in the sleep state, the maximum rotation speed of the indoor fan 102 is limited to a smaller rotation speed than when it is not in the sleep state. Therefore, even when the air volume set by the user is large, the air volume is restricted to be small until the sleep state is released. Thus, even when the heating operation is started from the sleep state of the compressor 111, the oil shortage in the compressor 111 can be prevented.
In the start-up control according to the second embodiment, the rotation speed of the indoor fan 102 may be increased to the second rotation speed N2 even while the compressor 111 is in the sleep state. That is, even in the stage before the sleep state of the compressor 111 is released, the air volume of the indoor fan 102 can be increased to such an extent that the oil shortage in the compressor 111 does not occur, and therefore, the comfort of the air conditioner 10 can be improved as compared with the conventional start-up control.
In the above start-up control described with reference to fig. 6 and 7, the rate of change of the indoor fan 102 is set to the first rate of change R1 even when the compressor 111 is started up while in the sleep state (S15). However, as in the first embodiment, in the case where the compressor 111 is in the sleep state, the rate of change of the indoor fan 102 may also be the second rate of change R2.
[ third embodiment ]
In the first and second embodiments, the sleep state of the compressor 111 is determined based on the outdoor heat exchanger temperature and the discharge temperature, but such determination requires a temperature sensor. In recent years, air conditioners have also been developed in which the number of temperature sensors used is reduced as much as possible, and it is considered effective if a sleep state can be determined without using a temperature sensor in such air conditioners.
Fig. 8 is a flowchart illustrating the start-up control at the start of the operation of the air conditioner 10 according to the third embodiment. In the start control according to the third embodiment, the same steps as those in the start control according to the first and second embodiments are assigned the same step numbers, and detailed description thereof is omitted.
When the air conditioner 10 starts to operate, in the start control of the second embodiment, it is first determined whether or not the compressor 111 is in the sleep state (S21). In this determination, the elapsed time tes from the previous operation end time to the current start time is compared with a threshold time (first threshold time) t4, and if the elapsed time tes is equal to or greater than the threshold time t4 (tes ≧ t4), it is determined that the sleep state is present. The air conditioner 10 includes a timer unit (timer or the like) for identifying the operation end time and the start time, and the previous operation end time is stored in the storage unit of the air conditioner 10.
At the time point when the air conditioner 1 finishes operating, it can be inferred that the temperature of the compressor 111 becomes high and is not in the sleep state. Further, although the temperature of the compressor 111 decreases after the operation of the air conditioner 10 is completed, it usually takes about half a day to one day until the compressor 111 comes to a sleep state. Therefore, if the threshold time t4 is set to a time (for example, 24 hours) required until the compressor 111 is in the sleep state, it can be considered that the compressor 111 is in the sleep state when tes ≧ t 4.
As described above, in the start-up control according to embodiment 3, it is possible to determine (estimate) whether or not the compressor 111 is in the sleep state without using the temperature sensor. This can be applied to a case where a temperature sensor for measuring the temperature of the outdoor heat exchanger or the discharge temperature is not provided.
When the compressor 111 is not in the sleep state (no in S1), the start operation of the air conditioner 10 includes the start of the compressor 111 (S2) and the start of the indoor fan 102 (S3). When the compressor 111 is in the sleep state (yes in S1), the start operation of the air conditioner 10 includes the start of the compressor 111 (S4) and the start of the indoor fan 102 (S5). That is, in the activation control of fig. 8, the operation after the sleep determination is the same as that of the first embodiment.
Fig. 9 is a flowchart showing a modification of the start-up control at the start of operation of the air conditioner 10 according to the third embodiment, and the operation after the sleep determination is the same as that of the second embodiment. Of course, the first and second embodiments may be combined in the operation after the sleep determination.
The start control shown in fig. 9 is a control in which the step of S1 of the start control shown in fig. 6 is replaced with the step of S21, and the step of S16 is replaced with the step of S26. In the step of S26, if the elapsed time ts from the current startup has not reached the threshold time t5 (e.g., 10 minutes) (ts < t5), it is determined that the sleep state has not been released. In the activation control of the third embodiment, since the determination of the sleep state is not performed using the temperature sensor, when the elapsed time ts from the start reaches the threshold time t5, it is regarded that the sleep state has been released.
[ fourth embodiment ]
Fig. 10 is a flowchart illustrating the start-up control at the start of the operation of the air conditioner 10 according to the fourth embodiment. In the startup control according to the fourth embodiment, the same steps as those in the startup control according to the first to third embodiments are assigned the same step numbers, and detailed description thereof is omitted.
When the air conditioner 10 starts to operate, in the start control of the second embodiment, it is first determined whether or not the compressor 111 is in the sleep state (S31). In this determination, it is determined whether there is a switching of power supply from the indoor unit 100 to the outdoor unit 110 (from relay off to relay on) in this startup, and if there is a switching of power supply, it is determined to be in a sleep state.
In the air conditioner 10, the supply of power from the indoor unit 100 to the outdoor unit 110 is not immediately terminated at the time when the user performs the operation stop operation using the remote controller or the like. Even if the operation of the air conditioner 10 is stopped by an operation instruction from the user, the power supply from the indoor unit 100 to the outdoor unit 110 is performed for a certain period of time, and then the power supply from the indoor unit 100 to the outdoor unit 110 is stopped (from the relay on to the relay off) after a predetermined period of time has elapsed.
That is, if the power supply from the indoor unit 100 to the outdoor unit 110 is not switched in the determination of S31, it is regarded that a short time has elapsed since the previous operation stop and the sleep state has not been established. On the other hand, if the power supply from the indoor unit 100 to the outdoor unit 110 is switched in the determination of S31, it may be considered that the compressor 111 is in the sleep state because a long time may have elapsed since the previous operation stop.
In the start control shown in fig. 10, the operation after the sleep determination is the same as the start control shown in fig. 8, and the operation after the sleep determination is the same as the first embodiment, but the operation after the sleep determination may be the same as the second embodiment. The start control in this case is a control in which the step of S21 of the start control shown in fig. 9 is replaced with the step of 31 of fig. 10. Of course, the first and second embodiments may be combined in the operation after the sleep determination.
As described above, in the start-up control according to the fourth embodiment, it is also possible to determine (estimate) whether or not the compressor 111 is in the sleep state without using the temperature sensor. This configuration can be applied to the air conditioner 10 not having a temperature sensor for measuring the temperature of the outdoor heat exchanger or the discharge temperature. In addition, when the operation after the sleep determination is the same as that in the first embodiment, the timer means such as a timer may be omitted as compared with the start control in the third embodiment.
[ fifth embodiment ]
Fig. 11 is a flowchart illustrating the start-up control at the start of the operation of the air conditioner 10 according to the fifth embodiment. In the start-up control according to the fifth embodiment, the same steps as those in the start-up control according to the first to fourth embodiments are assigned the same step numbers, and detailed description thereof is omitted.
When the operation of the air conditioner 10 is started, in the start-up control of the fifth embodiment, first, the compressor 111 is started without determining whether or not the compressor 111 is in the sleep state (S41). The start-up of the compressor 111 in S41 may be the same as the start-up of the compressor 111 in S2 and S4 of fig. 2. Then, it is determined whether the discharge temperature of the compressor 111 is lower than the indoor temperature (room temperature) (S42).
If the discharge temperature is lower than the indoor temperature (yes in S42), it is further determined whether the elapsed time ts from the start of startup has reached the threshold time (second threshold time) t6 (e.g., 3 minutes) (S43). If yes in both steps S42 and S43, the indoor fan 102 is started with the compressor 111 in the sleep state (S5). On the other hand, if no in both steps S42 and S43, the indoor fan 102 is started without the compressor 111 being in the sleep state (S5).
In the activation control shown in fig. 11, the operation after the sleep determination is the same as in the first embodiment, but the operation after the sleep determination may be the same as in the third and fourth embodiments, or the operation in which the first and second embodiments are combined may be performed.
The threshold time t6 may be a variable value instead of a fixed value. For example, the determination condition in S42 is satisfied, that is, before the current start, the discharge temperature < the indoor temperature
When the activation is performed in the established state (the activation from the sleep state), the elapsed time from the activation to the determination that the condition is not established and the sleep state is considered to be released may be stored, and the stored elapsed time may be set as the threshold time t6 in the present activation control. In this case, the sleep state can be judged with higher accuracy, and the oil shortage of the compressor 111 can be prevented more reliably.
In the activation control shown in fig. 11, it is basically determined that the discharge temperature is lower than the indoor temperature, but if no in S43, the process proceeds to S3, and the indoor fan 102 is activated if not in the sleep state. That is, a point of time at which the sleep state has not been completely released may be shifted to S3. This is because, if the elapsed time ts reaches the threshold time t6, even if the sleep state has not been completely released at this point in time, it is in a state close to the release, and the rotation speed of the indoor fan 102 does not reach the maximum rotation speed immediately after the transition to S3. That is, even if the determination proceeds from "no" at S43 to S3, it is considered that the sleep state has been released before the rotation speed of the indoor fan 102 reaches the maximum rotation speed.
However, the step of S43 in fig. 11 is not essential, and may be omitted. In this case, the process proceeds to S5 when it is determined to be yes in S42, and proceeds to S3 when it is determined to be no in S42.
[ sixth embodiment ]
The air conditioner 10 according to the sixth embodiment is connected to a server of a manufacturer via the internet, and is capable of storing (cloud saving) various data related to startup control in the server. In this case, the cloud may be combined with the start-up control of the first to fifth embodiments described above to perform higher-level start-up control.
For example, in the case where a cloud is combined in the activation control of the third embodiment, the cloud may be used to set the threshold time t 4. Specifically, the server stores, as data, threshold time t4 corresponding to various state parameters such as the season, time zone, and installation situation of the air conditioner 10, and when the air conditioner 10 performs the start-up control of the third embodiment, the threshold time t4 corresponding to these state parameters may be read from the server and set. Thereby, the sleep state can be determined with higher accuracy, and the oil shortage of the compressor 111 can be prevented more reliably.
Further, for example, in the case where a cloud is combined into the activation control of the seventh embodiment, the cloud may be used to set the threshold time t 6. Specifically, a plurality of elapsed times from startup until the sleep state is deemed to have been released are stored in the server in association with a temperature condition (for example, outside air temperature at startup), and the threshold time t6 at the next startup may be an elapsed time of stored data close to the temperature condition. Thereby, the sleep state can be determined with higher accuracy, and the oil shortage of the compressor 111 can be prevented more reliably.
[ seventh embodiment ]
In the first and second embodiments, the sleep state is determined using the cycle temperature such as the outdoor heat exchanger temperature and the discharge temperature. However, it is also conceivable to use the temperatures of the electrical components in the indoor unit 100 (electrical component temperatures) instead of these cycle temperatures to make the determination of the sleep state. The electric components included in the electric circuit of the air conditioner 10 also include components that monitor temperature for circuit protection (e.g., IPM (Intelligent Power Module)).
In this case, if the electric component temperature is lower than a certain reference value, it is also possible to determine that the load on the compressor 111 is low and in the sleep state.
Thus, if the temperature of the electric component is used, the determination of the sleep state can be performed without using the cycle temperature having a large temperature change, and the determination of the sleep state can be performed with higher accuracy. In the same manner as the start-up control of the third embodiment, the present invention may be applied to an air conditioner 10 that does not include a temperature sensor for measuring the temperature of the outdoor heat exchanger or the discharge temperature.
The embodiments disclosed herein are illustrative in all respects and should not be construed as limiting. Therefore, the technical scope of the present invention is defined not by the description of the above embodiments but by the claims. Further, the scope of the present invention includes all modifications within the meaning and range equivalent to the claims.

Claims (10)

1. An air conditioner is characterized in that,
includes a determination unit for determining whether the compressor is in a sleep state when the heating operation is started,
when the judging part judges that the compressor is not in the sleep state, the indoor fan is increased to the target rotating speed at a first change rate,
and when the judging part judges that the compressor is in the sleep state, the indoor fan is started to the target rotating speed at a second change rate, wherein the second change rate is slower than the first change rate.
2. An air conditioner is characterized in that,
includes a determination unit for determining whether the compressor is in a sleep state when the heating operation is started,
limiting the maximum rotation speed of the indoor fan to a first rotation speed when the judging part judges that the compressor is not in the sleep state,
and limiting the maximum rotation speed of the indoor fan to a second rotation speed smaller than the first rotation speed when the judging part judges that the compressor is in the sleep state.
3. The air conditioner according to claim 1 or 2,
the determination unit determines, for a predetermined temperature threshold value Δ T1,
when the temperature of the outdoor heat exchanger < the outside air temperature + Δ T1 is satisfied, it is determined that the sleep state is present.
4. The air conditioner according to claim 1 or 2,
the determination unit determines, for a predetermined temperature threshold value Δ T2,
when the discharge temperature of the compressor < the outside air temperature + Δ T2 is satisfied, it is determined that the compressor is in the sleep state.
5. The air conditioner according to claim 1 or 2,
the determination unit compares an elapsed time from a previous operation end time to a current start time with a first threshold time, and determines that the device is in a sleep state if the elapsed time is equal to or longer than the first threshold time.
6. The air conditioner according to claim 1 or 2,
the determination unit determines that the indoor unit is in the sleep state if the power supply from the indoor unit to the outdoor unit is switched during the current startup.
7. The air conditioner according to claim 1 or 2,
the determination unit determines that the compressor is in a sleep state if the discharge temperature of the compressor is lower than a room temperature.
8. The air conditioner according to claim 7,
limiting the maximum rotation speed of the indoor fan to a first rotation speed when the judging part judges that the compressor is not in the sleep state,
limiting the maximum rotation speed of the indoor fan to a second rotation speed less than the first rotation speed during a period from the current start to the elapse of a second threshold time when the determination unit determines that the compressor is in the sleep state,
the second threshold time is a time elapsed from the start to the release of the sleep state, when the start is started from the sleep state before the current start, and the stored time elapsed is set as the second threshold time at the current start.
9. The air conditioner according to claim 5,
the air conditioner is connected to the server via the internet,
the server stores, as data, the first threshold time corresponding to a state parameter of an air conditioner, and when the air conditioner is started, reads and sets the first threshold time corresponding to the state parameter at the time of start from the server.
10. The air conditioner according to claim 1 or 2,
the determination unit determines that the indoor unit is in the sleep state when the temperature of the electrical component in the indoor unit is lower than a reference value.
CN202010486736.XA 2019-06-06 2020-06-01 Air conditioner Pending CN112050381A (en)

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Application publication date: 20201208