WO2016045171A1 - 变频空调回油的控制方法、装置及室外机 - Google Patents

变频空调回油的控制方法、装置及室外机 Download PDF

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Publication number
WO2016045171A1
WO2016045171A1 PCT/CN2014/090794 CN2014090794W WO2016045171A1 WO 2016045171 A1 WO2016045171 A1 WO 2016045171A1 CN 2014090794 W CN2014090794 W CN 2014090794W WO 2016045171 A1 WO2016045171 A1 WO 2016045171A1
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WIPO (PCT)
Prior art keywords
outdoor unit
air conditioner
inverter
operating frequency
oil
Prior art date
Application number
PCT/CN2014/090794
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English (en)
French (fr)
Inventor
曹培春
朱海滨
耿海兵
李丛来
Original Assignee
青岛海信日立空调系统有限公司
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Application filed by 青岛海信日立空调系统有限公司 filed Critical 青岛海信日立空调系统有限公司
Publication of WO2016045171A1 publication Critical patent/WO2016045171A1/zh

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Classifications

    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant

Definitions

  • the present invention relates to the field of air conditioning technology, and in particular, to a control method and device for an inverter air conditioner oil return, and an outdoor unit.
  • the compressor in the air conditioner cannot achieve oil-free lubrication.
  • the lubricating oil is a substance that lubricates between moving parts in the compressor. If the compressor lacks lubricating oil, the compressor motor bearing and the compression chamber will be obtained. Less effective lubrication, resulting in increased friction can cause damage to the compressor. However, when the compressor is running, the lubricant will drain with the refrigerant. On the one hand, the discharged lubricating oil enters the heat exchanger with the refrigerant, which affects the heat exchange efficiency, resulting in a decrease in the heating/cooling performance of the air conditioner. On the other hand, the discharged lubricating oil cannot be returned to the compressor and the compressor is insufficiently lubricated. , thereby aggravating the friction between the motor bearing and the compression chamber in the compressor, and accelerating the damage of the compressor.
  • the connected heat exchanger further includes an oil separator 12 in communication with the compressor 11, and a capillary 13 having one end in communication with the oil separator 12 and the other end in communication with the compressor 11.
  • the lubricating oil mixed in the refrigerant can be deposited at the bottom of the oil separator 12 and passed through The capillary 13 is returned to the compressor 11, thereby ensuring the oil return safety of the compressor 11.
  • the separated refrigerant enters the heat exchanger through the outlet of the oil separator 12, thereby ensuring the heating/cooling performance of the air conditioner.
  • the amount of lubricating oil discharged from the compressor is related to the operating frequency.
  • the amount of refrigerant discharged differs depending on the operating frequency, and therefore the amount of lubricating oil contained in the refrigerant is also different.
  • the amount of oil passing through the capillary 13 in Fig. 1 that is, the amount of oil returned by the system, is only related to the pressure difference across the capillary 13, and The operating frequency of the compressor 11 is independent. By controlling the pressure difference across the capillary 13, the lubricating oil discharged from the compressor 11 is returned to the compressor 11 through the capillary 13.
  • the capillary 13 ⁇ is designed, and the maximum lubricating oil discharge can only be achieved according to the maximum operating frequency of the inverter compressor. To design. This will cause the inverter compressor to operate in the low and mid frequency bands. Since the amount of oil discharged from the inverter compressor is relatively small, the pressure difference across the capillary 13 is substantially constant, resulting in an excessive bypass of the capillary 13, that is, the refrigerant.
  • the inverter 13 is also returned to the inverter compressor, so that the refrigerant that enters the heat exchanger to participate in heating/cooling is relatively reduced, and the heating/cooling capacity of the air conditioner is reduced, and the heating/cooling performance of the air conditioner is degraded.
  • Embodiments of the present invention provide a control method and apparatus for an inverter air conditioner oil return, and an outdoor unit to solve at least the problem that the inverter compressor operates in a low frequency and a medium frequency range, and the cooling or heating capability of the air conditioner is lowered.
  • a control method for returning oil of an inverter air conditioner includes an outdoor unit, and the outdoor unit includes an inverter compressor, and an oil separator connected to the inverter compressor.
  • the outdoor unit further includes an outdoor unit electronic expansion valve, wherein one end of the outdoor unit electronic expansion valve is in communication with the oil separator, and the other end is in communication with the inverter compressor;
  • the method includes:
  • a control device for returning oil of an inverter air conditioner includes an outdoor unit, and the outdoor unit includes an inverter compressor, and an oil separator connected to the inverter compressor.
  • the outdoor unit further includes an outdoor unit electronic expansion valve, wherein one end of the outdoor unit electronic expansion valve is in communication with the oil separator, and the other end is in communication with the inverter compressor;
  • the control device for returning oil to the inverter air conditioner includes: a detecting unit, a determining unit, and an adjusting unit; [0015] the detecting unit is configured to detect a first operating frequency of the inverter compressor;
  • the determining unit is configured to determine, according to the first operating frequency, a pre-stored correspondence, a first threshold value of the outdoor unit electronic expansion valve corresponding to the first operating frequency, where The corresponding relationship is a correspondence relationship between an operating frequency and a twist value of the outdoor unit electronic expansion valve;
  • the adjusting unit is configured to adjust a twist value of the outdoor unit electronic expansion valve to the first twist value
  • an outdoor unit of an inverter air conditioner includes an inverter compressor, an oil separator connected to the inverter compressor, and the outdoor unit further includes an outdoor unit electronic expansion valve.
  • the control device for the inverter air conditioner oil return according to the second aspect wherein one end of the outdoor unit electronic expansion valve is in communication with the oil separator, and the other end is in communication with the inverter compressor.
  • the control method, device and outdoor unit of the inverter air conditioner returning oil obtained by the embodiment of the invention obtain the current operating frequency of the inverter compressor by detecting the first operating frequency of the variable frequency compressor. Determining, by the first operating frequency, a correspondence relationship between the pre-stored operating frequency and the temperature value of the outdoor unit electronic expansion valve, determining a first temperature value of the outdoor unit electronic expansion valve corresponding to the first operating frequency, that is, The temperature value of the outdoor unit electronic expansion valve corresponding to the current operating frequency of the inverter compressor is determined. By adjusting the temperature value of the outdoor electronic expansion valve to the first temperature value, the current temperature value of the outdoor unit electronic expansion valve corresponds to the current operating frequency of the inverter compressor.
  • the inverter can be made back in the inverter air conditioner system.
  • the amount of oil is equivalent to the amount of lubricating oil discharged from the inverter compressor.
  • the discharged lubricating oil and helium are returned to the compressor to ensure reliable operation of the compressor; on the other hand, the frequency conversion compression in the prior art is prevented.
  • the bypass of the capillary is too large, that is, the refrigerant is also returned to the compressor through the oil return capillary to reduce the heating/cooling performance of the air conditioner, and the inverter compressor is improved in the low frequency and medium.
  • a control method for returning oil of an inverter air conditioner includes an outdoor unit, and the outdoor unit includes an inverter compressor, and an oil separator connected to the inverter compressor.
  • the outdoor unit further includes at least two sets of capillary tubes and solenoid valves connected in series, the at least two sets of capillary tubes and solenoid valves connected in series are connected in parallel with each other, and at least one of the two sets of capillary tubes and solenoid valves connected in series is separated from the oil.
  • the device is in communication with the other end being in communication with the inverter compressor;
  • the method includes:
  • a control device for returning oil of an inverter air conditioner includes an outdoor unit, and the outdoor unit includes an inverter compressor, and an oil separator connected to the inverter compressor.
  • the outdoor unit further includes at least two sets of capillary tubes and solenoid valves connected in series, the at least two sets of series connected capillary tubes and solenoid valves being connected in parallel with each other, the at least two sets of series connected capillary tubes and one end of the solenoid valve and the oil separator Connected to the other end and connected to the inverter compressor;
  • the control device for returning oil to the inverter air conditioner includes: a detecting unit and a control unit;
  • the detecting unit is configured to detect a first operating frequency of the inverter compressor
  • the control unit is configured to control, according to the first operating frequency, in combination with a preset strategy, the opening and closing of the at least two sets of capillary tubes and solenoid valves in the series.
  • an outdoor unit of an inverter air conditioner includes an inverter compressor, and an oil separator connected to the inverter compressor, wherein the outdoor unit further includes at least two a series of capillary and solenoid valves, and a control device for inverter air conditioner oil return according to the fifth aspect, wherein the at least two sets of series connected capillary and solenoid valves are connected in parallel with each other, and the at least two sets of capillary tubes connected in series And one end of the solenoid valve is in communication with the oil separator, and the other end is in communication with the inverter compressor.
  • the control method, device and outdoor unit of the inverter air conditioner returning oil obtained by the embodiment of the invention obtain the current operating frequency of the inverter compressor by detecting the first operating frequency of the inverter compressor.
  • the first operating frequency is combined with a preset strategy to control the opening and closing of the at least two sets of capillary and solenoid valves in series such that the current solenoid valve is turned on and off corresponding to the current operating frequency of the inverter compressor. Due to the opening and closing of the solenoid valve, different lengths and/or numbers of capillaries can be connected, which directly determines the oil return of the inverter air conditioner system, and the operating frequency of the inverter compressor directly determines the row of the inverter air conditioner system.
  • the amount of oil therefore based on the above scheme, can make the oil return amount and the frequency conversion in the inverter air conditioner system
  • the amount of lubricating oil discharged from the compressor is equivalent.
  • the discharged lubricating oil and helium are returned to the compressor to ensure reliable operation of the compressor;
  • the inverter compressor of the prior art is prevented from being in the low frequency and in the middle.
  • the bypass of the capillary tube is too large, that is, the refrigerant is returned to the compressor by the oil return capillary to return to the heating/cooling or performance degradation of the air conditioner, and the inverter compressor is operated in the low frequency and middle frequency range. Heating/cooling performance.
  • 1 is a schematic view showing the composition of an outdoor unit of an air conditioner in the prior art
  • FIG. 2 is a schematic diagram 1 of an outdoor unit of an inverter air conditioner according to an embodiment of the present invention
  • FIG. 3 is a schematic flow chart 1 of a method for controlling oil return of an inverter air conditioner according to an embodiment of the present invention
  • FIG. 4 is a schematic flow chart 2 of a method for controlling oil return of an inverter air conditioner according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram 1 of a control device for returning oil of an inverter air conditioner according to an embodiment of the present invention
  • FIG. 6 is a second schematic structural diagram of a control device for returning oil of an inverter air conditioner according to an embodiment of the present invention
  • FIG. 7 is a second schematic diagram of an outdoor unit of an inverter air conditioner according to an embodiment of the present invention.
  • FIG. 8 is a schematic flowchart 3 of a control method for returning oil of an inverter air conditioner according to an embodiment of the present invention
  • FIG. 9 is a schematic flow chart 4 of a method for controlling oil return of an inverter air conditioner according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a control device for returning oil of an inverter air conditioner according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a preferred embodiment for implementing the invention.
  • the embodiment of the present invention provides a control method for returning oil of an inverter air conditioner, which is specifically applied to the outdoor unit 1 of the variable frequency air conditioner shown in FIG. 2, and the outdoor unit 1 of the inverter air conditioner includes:
  • the outdoor unit electronic expansion valve 14 is connected to the oil separator 12 at one end and to the inverter compressor 11 at the other end.
  • the inverter air conditioner oil return control device 15 is used to control the outdoor unit electronic expansion valve 14 in the inverter air conditioner system
  • the outdoor unit electronic expansion valve 14 has the characteristics of adjustable twist, by adjusting the outdoor unit electronic expansion valve
  • the twist value of 14 can control the amount of lubricating oil returned from the oil separator 12 of the outdoor unit 1 of the inverter air conditioner to the inverter compressor 11, that is, control the oil return amount of the inverter air conditioner system, and the oil return amount in the inverter air conditioner system It is equivalent to the amount of lubricating oil discharged from the inverter compressor 11.
  • the method specifically includes:
  • S102 Determine a first threshold value of the outdoor unit electronic expansion valve corresponding to the first operating frequency according to the first operating frequency and the pre-stored correspondence, wherein the correspondence relationship is the operating frequency and the outdoor unit electronic The correspondence between the values of the expansion valves.
  • the correspondence between the operating frequency and the twist value of the outdoor electronic expansion valve 14 is a one-to-one mapping relationship, that is, in the operating state of the inverter compressor 11
  • Each operating frequency corresponds to a twist value of the only one electronic expansion valve 14; or, in the operating state of the inverter compressor 11, each operating frequency segment corresponds to a twist value of the only one electronic expansion valve 14.
  • the first threshold value ⁇ of the outdoor unit electronic expansion valve 14 is determined according to the correspondence relationship stored in advance, and the unique value is obtained. Corresponding first twist value.
  • the embodiment of the present invention further provides a control method for returning oil of the inverter air conditioner, as shown in FIG. 4, adjusting the temperature of the electronic expansion valve of the outdoor unit to the first temperature value (step S103) ) before, including
  • S104 Determine whether the current temperature value of the outdoor unit electronic expansion valve is the first temperature value. [0054] If the current temperature value of the outdoor unit electronic expansion valve is not the first temperature value, step S103 is performed.
  • the current temperature value of the electronic expansion valve of the outdoor unit may be the first temperature value ⁇ , and it is not necessary to perform the adjustment of the temperature value of the electronic expansion valve of the outdoor unit to the first temperature value.
  • the steps save the resources of the inverter air conditioner system, and can also avoid the problem that the outdoor unit electronic expansion valve affects the flexibility and the life due to repeated adjustments.
  • the control method of the inverter air conditioner returning oil obtained by the embodiment of the invention obtains the current operating frequency of the inverter compressor by detecting the first operating frequency of the inverter compressor. Determining, by the first operating frequency, a correspondence relationship between the pre-stored operating frequency and the temperature value of the outdoor unit electronic expansion valve, determining a first temperature value of the outdoor unit electronic expansion valve corresponding to the first operating frequency, that is, The temperature value of the outdoor unit electronic expansion valve corresponding to the current operating frequency of the inverter compressor is determined. By adjusting the temperature value of the outdoor unit electronic expansion valve to the first temperature value, the current temperature value of the outdoor unit electronic expansion valve corresponds to the current operating frequency of the inverter compressor.
  • the inverter air conditioner oil return provided by the embodiment of the present invention
  • the control method can make the oil return amount in the inverter air conditioner system equal to the amount of lubricating oil discharged from the inverter compressor, and on the other hand, ensure that the discharged lubricating oil and the helium return to the compressor, thereby ensuring reliable operation of the compressor;
  • the inverter of the prior art is prevented from operating in the low frequency and the middle frequency band, and the bypass amount of the capillary is too large, that is, the refrigerant is returned to the compressor through the capillary, and the heating/cooling performance of the air conditioner is lowered. , improve the heating/cooling performance of the air conditioner in the low frequency and middle frequency range of the inverter compressor.
  • the embodiment of the present invention provides a control device 15 for the oil return of the inverter air conditioner, which is specifically applied to the outdoor unit 1 of the inverter air conditioner shown in FIG. 2 , and the outdoor unit 1 of the inverter air conditioner can be specifically referred to the embodiment.
  • the description of FIG. 2 in the first embodiment of the present invention is not described herein again.
  • the control device 15 for returning oil to the inverter air conditioner includes: a detecting unit 501, a determining unit 502, and an adjusting unit 503.
  • the detecting unit 501 is configured to detect a first operating frequency of the inverter compressor.
  • a determining unit 502 configured to determine, according to the first operating frequency, and a pre-stored correspondence, a first threshold value of the outdoor unit electronic expansion valve corresponding to the first operating frequency, where the corresponding relationship is Correspondence between the operating frequency and the temperature value of the outdoor unit electronic expansion valve.
  • the adjusting unit 503 is configured to adjust the twist value of the outdoor unit electronic expansion valve to a first temperature value.
  • the embodiment of the present invention further provides a control device 15 for returning oil to the inverter air conditioner.
  • the control device 15 for returning oil to the inverter air conditioner further includes a determining unit 504.
  • the determining unit 504 is configured to determine, before the adjusting unit 503 adjusts the temperature value of the outdoor unit electronic expansion valve to the first temperature value, whether the current temperature value of the outdoor unit electronic expansion valve is the first a degree value; [0065] The adjusting unit 503 is specifically configured to:
  • the determining unit 504 determines that the current temperature value of the outdoor unit electronic expansion valve is not the first temperature value, the temperature value of the outdoor unit electronic expansion valve is adjusted to the first temperature value.
  • the control device for returning oil of the inverter air conditioner detects the first operating frequency of the inverter compressor through the detecting unit, and obtains the current operating frequency of the inverter compressor. Obtaining, by the determining unit, the first twist value of the outdoor unit electronic expansion valve corresponding to the first operating frequency according to the first operating frequency and the correspondence between the pre-stored operating frequency and the temperature value of the outdoor unit electronic expansion valve That is, the temperature value of the outdoor unit electronic expansion valve corresponding to the current operating frequency of the inverter compressor is obtained. The temperature value of the outdoor unit electronic expansion valve is adjusted to the first temperature value by the adjusting unit, so that the current temperature value of the outdoor unit electronic expansion valve corresponds to the current operating frequency of the inverter compressor.
  • the inverter air conditioner of the embodiment of the present invention returns the oil.
  • the control device can make the oil return amount in the inverter air conditioner system equal to the amount of lubricating oil discharged from the inverter compressor, and on the other hand, ensure that the discharged lubricating oil and the helium return to the compressor, thereby ensuring reliable operation of the compressor;
  • the prior art inverter compressor is prevented from operating in the low frequency and the middle frequency band, and the bypass amount of the capillary is too large, that is, the refrigerant is returned to the compressor through the capillary, and the heating/cooling or performance degradation of the air conditioner generated is caused. , improve the heating/cooling performance of the air conditioner in the low frequency and middle frequency range of the inverter compressor.
  • An embodiment of the present invention provides an outdoor unit 1 for an inverter air conditioner.
  • the outdoor unit 1 of the inverter air conditioner includes: an inverter compressor 11 and an oil separator connected to the inverter compressor 11 12, outdoor unit electronics The expansion valve 14 and the control device 15 for the inverter air conditioner oil return in the second embodiment.
  • One end of the outdoor unit electronic expansion valve 14 is in communication with the oil separator 12, and the other end is in communication with the inverter compressor 11.
  • the inverter air conditioner returning oil control device 15 is used for controlling the outdoor unit electronic expansion valve 14 in the inverter air conditioner system, and the outdoor unit electronic expansion valve 14 has the characteristics of adjustable twist, by adjusting the outdoor unit electronic expansion valve
  • the twist value of 14 can control the amount of lubricating oil returned from the oil separator 12 of the inverter air conditioner outdoor unit 1 to the inverter compressor 11, that is, control the oil return amount of the inverter air conditioner system, and the oil return amount in the inverter air conditioner system It is equivalent to the amount of lubricating oil discharged from the inverter compressor 11.
  • control method of the inverter air conditioner oil returning device 15 for controlling the oil return of the inverter air conditioner can be referred to the description of the first embodiment, and the details of the embodiment of the present invention are not described herein again.
  • the outdoor unit of the inverter air conditioner provided by the embodiment of the present invention directly determines the oil return amount of the inverter air conditioner system due to the size of the electronic expansion valve of the outdoor unit, and increases the outdoor space between the inverter compressor and the oil separator.
  • the electronic expansion valve of the machine makes the oil return amount of the air conditioner system of the prior art not fixed, but the oil return amount of the system in the inverter air conditioner can control the outdoor machine electronic device through the control device of the inverter air conditioner returning oil.
  • the expansion value of the expansion valve is adjusted.
  • the operating frequency of the inverter compressor directly determines the oil displacement of the inverter air conditioner system.
  • the current operating frequency of the inverter compressor is detected by the control device of the inverter air conditioner returning oil, and the twist value of the electronic expansion valve is adjusted to the twist value corresponding to the current operating frequency of the inverter compressor according to the pre-stored correspondence relationship.
  • the outdoor unit of the inverter air conditioner provided by the embodiment of the present invention can make the oil return amount in the inverter air conditioner system equivalent to the amount of lubricating oil discharged from the inverter compressor.
  • it ensures that the discharged lubricating oil and helium are returned to the compressor to ensure the reliable operation of the compressor; on the other hand, the inverter of the prior art is prevented from operating in the low frequency and the middle frequency band, and the bypass of the capillary tube is excessive. Large, that is, the problem that the refrigerant is returned to the compressor by the capillary to reduce the heating/cooling or performance of the air conditioner, and the heating/cooling performance of the inverter compressor operating in the low frequency and the middle frequency range is improved.
  • the embodiment of the present invention provides a control method for returning oil of an inverter air conditioner, which is specifically applied to the outdoor unit 1 of the variable frequency air conditioner shown in FIG. 7, and the outdoor unit 1 of the inverter air conditioner includes:
  • the capillary tube 16 and the solenoid valve 17 are connected in parallel with each other, and at least two sets of the capillary tube 16 and one end of the solenoid valve 17 are connected in series. It is in communication with the oil separator 12 and is connected to the inverter compressor 11 at the other end.
  • the inverter air conditioner returning control device 15 is used for controlling the opening and closing of the solenoid valve 17 in the inverter air conditioner system, thereby causing different lengths and/or numbers of capillaries to be in a connected state, so that the slave oil separator 12 is
  • the lubricating oil flowing out can be returned to the inverter compressor 11 through the connected capillary tubes, thereby controlling the amount of lubricating oil returned from the oil separator 12 of the inverter air conditioner outdoor unit 1 to the inverter compressor 11, that is, controlling the inverter air conditioner system.
  • the amount of oil returned is such that the amount of oil returned in the inverter air conditioner system is equivalent to the amount of lubricant discharged from the inverter compressor 11.
  • the method specifically includes:
  • S202 Control, according to the first operating frequency, in combination with a preset strategy, at least two sets of capillary tubes in series and a solenoid valve in the solenoid valve are turned on and off.
  • the outdoor unit 1 includes two sets of capillary tubes 16 and solenoid valves 17 connected in series, and one of the series of capillary tubes 16 and the first of the solenoid valves 17 has a length greater than the other set of capillary tubes 16 and electromagnetic The length of the second capillary in valve 17, Bay 1J
  • step S202 specifically includes:
  • the operating frequency of the inverter compressor 11 is divided into three stages of low frequency, intermediate frequency, and high frequency.
  • the first operating frequency is low frequency
  • the length of the connecting solenoid valve 17 is long.
  • the short capillaries 16 are all connected.
  • the oil return quantity of the ⁇ inverter air conditioner system is also small, so the oil return amount in the inverter air conditioner system is equivalent to the amount of lubricating oil discharged from the inverter compressor 11; when the first operating frequency is the intermediate frequency ⁇ , the inverter compressor 11 discharges The amount of lubricating oil is relatively large, and the capillary 16 having a short connecting length, the oil returning amount of the ⁇ inverter air conditioner system is relatively large, so the oil return amount in the inverter air conditioner system and the lubricating oil discharged from the inverter compressor 11 When the first operating frequency is high frequency ⁇ , since the variable frequency compressor 11 discharges the most amount of lubricating oil, the capillary 16 having a long length and the capillary 16 having a short length are connected in the ⁇ inverter air conditioning system. The amount of oil is also the most, so the amount of oil returned in the inverter air conditioner system is equivalent to the amount of lubricant discharged from the inverter compressor 11.
  • the control method of the inverter air conditioner returning oil obtained by the embodiment of the present invention obtains the current operating frequency of the inverter compressor by detecting the first operating frequency of the inverter compressor.
  • the at least two sets of capillary and solenoid valves connected in series are controlled to be turned on and off, so that the current solenoid valve is turned on and off corresponding to the current operating frequency of the inverter compressor. Due to the opening and closing of the solenoid valve, different lengths and/or numbers of capillaries can be connected, which directly determines the oil return of the inverter air conditioner system, and the operating frequency of the inverter compressor directly determines the row of the inverter air conditioner system.
  • the control method of the inverter air conditioner returning oil provided by the embodiment of the invention can make the oil return amount in the inverter air conditioner system equal to the amount of lubricating oil discharged from the inverter compressor, and on the one hand, ensure the discharged lubricating oil and ⁇ Return to the compressor to ensure reliable operation of the compressor; on the other hand, prevent the inverter compressor of the prior art from operating in the low frequency and middle frequency bands, the bypass of the capillary is too large, that is, the refrigerant also returns to the compressor through the capillary
  • the problem of heating/cooling or performance degradation of the produced air conditioner improves the heating/cooling performance of the air conditioner in the low frequency and middle frequency range of the inverter compressor.
  • Embodiments of the present invention provide a control device 15 for returning oil of an inverter air conditioner, which is specifically applied as shown in FIG.
  • a control device 15 for returning oil of an inverter air conditioner which is specifically applied as shown in FIG.
  • the control device 15 for returning oil to the inverter air conditioner includes: a detecting unit 1001 and a control unit 102.
  • the detecting unit 1001 is configured to detect a first operating frequency of the inverter compressor.
  • the control unit 1002 is configured to control, according to the first operating frequency, in combination with a preset strategy, at least two sets of capillary tubes in series and a solenoid valve in the solenoid valve to be turned on and off.
  • the outdoor unit 1 includes two sets of capillary tubes 16 and solenoid valves 17 connected in series, and one of the series of capillary tubes 16 and the first of the solenoid valves 17 has a length greater than the other set of capillary tubes 16 and electromagnetic
  • the length of the second capillary in the valve 17 is specifically used to:
  • the control device for returning oil of the inverter air conditioner detects the first operating frequency of the inverter compressor by the detecting unit, and obtains the current operating frequency of the inverter compressor. Controlling, according to the first operating frequency, a preset strategy, controlling the opening and closing of the at least two sets of capillary and solenoid valves in series, so that the current solenoid valve is turned on and off and the current operating frequency of the inverter compressor is correspond. Due to the opening and closing of the solenoid valve, different lengths and/or numbers of capillaries can be connected, which directly determines the oil return of the inverter air conditioner system, and the operating frequency of the inverter compressor directly determines the row of the inverter air conditioner system.
  • the control device for returning oil of the inverter air conditioner provided by the embodiment of the invention can make the oil return amount in the inverter air conditioner system equal to the amount of lubricating oil discharged from the inverter compressor, and on the one hand, ensure the discharged lubricating oil and ⁇ Return to the compressor to ensure reliable operation of the compressor; on the other hand, prevent the inverter compressor of the prior art from operating in the low frequency and middle frequency bands, the bypass of the capillary is too large, that is, the refrigerant also returns to the compressor through the capillary
  • the problem of heating/cooling or performance degradation of the produced air conditioner improves the heating/cooling performance of the air conditioner in the low frequency and middle frequency range of the inverter compressor.
  • Embodiment 6 [0101] The embodiment of the present invention further provides an outdoor unit 1 for an inverter air conditioner. As shown in FIG. 7, the outdoor unit 1 includes
  • the inverter compressor 11 and the oil separator 12 communicating with the inverter compressor 11 further include at least two sets of capillary and solenoid valves connected in series, and a control device 15 for inverter oil returning oil in the fifth embodiment, wherein At least two sets of capillary tubes 16 and solenoid valves 17 connected in series are connected in parallel with each other, and at least two sets of capillary tubes 16 and one end of the solenoid valve 17 are in communication with the oil separator 12, and the other end is in communication with the inverter compressor 11.
  • the inverter air conditioner returning control device 15 is used for controlling the opening and closing of the solenoid valve 17 in the inverter air conditioner system, and by opening and closing different solenoid valves, different lengths and/or numbers can be further
  • the capillary tubes are in a communicating state, so that the lubricating oil flowing out of the oil separator 12 can be returned to the inverter compressor 11 through the communicating capillary tubes, thereby controlling the return from the oil separator 12 of the inverter air conditioner outdoor unit 1 to the inverter compressor 11
  • the amount of lubricating oil in the inverter that is, the amount of oil returning in the inverter air conditioner system, is such that the amount of oil returned in the inverter air conditioner system is equivalent to the amount of lubricating oil discharged from the inverter compressor 11.
  • control method of the inverter air conditioner oil returning device 15 can be used for the control method of the inverter air conditioner oil return. Reference may be made to the description of the fourth embodiment, which is not described herein again.
  • the outdoor unit of the inverter air conditioner provided by the embodiment of the invention can make the oil return amount in the inverter air conditioner system equal to the amount of lubricating oil discharged from the inverter compressor, and on the other hand, ensure the discharged lubricating oil And returning to the compressor to ensure the reliable operation of the compressor; on the other hand, preventing the inverter compressor of the prior art from operating in the low frequency and the middle frequency band, the bypass of the capillary is too large, that is, the refrigerant is also compressed by the capillary.
  • the problem of heating/cooling or performance degradation of the air conditioner produced improves the heating/cooling performance of the air conditioner in the low frequency and middle frequency range of the inverter compressor.

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Abstract

变频空调的回油控制方法、装置及室外机，其中变频空调的室外机（1）中，室外机电子膨胀阀（14）两端分别与油分离器（12）和变频压缩机（11）连通。回油的控制方法包括：检测变频压缩机（11）的第一运转频率；根据第一运转频率以及预先存储的对应关系，确定对应的室外机电子膨胀阀（14）的第一开度值；将室外机电子膨胀阀（14）的开度调整为第一开度值。该方法能解决变频压缩机在低频和中频段运转时空调的能力下降的问题。

Description

说明书 发明名称：变频空调回油的控制方法、 装置及室外机 技术领域
[0001] 本发明涉及空调技术领域， 尤其涉及变频空调回油的控制方法、 装置及室外机 背景技术
[0002] 随着人们生活水平的日益提高， 对空调制热 /制冷性能的要求也越来越高。 通 常， 影响空调的制热 /制冷性能的一个重要因素就是空调中的压缩机。
[0003] 目前， 空调中的压缩机还无法实现无油润滑， 润滑油是对压缩机内运动部件之 间起润滑作用的物质， 如果压缩机缺少润滑油， 压缩机电机轴承和压缩腔将得 不到有效润滑， 从而摩擦加剧会导致压缩机损坏。 然而， 压缩机运转吋， 润滑 油会随冷媒排出。 一方面， 排出的润滑油随冷媒进入换热器， 影响换热效率， 从而导致空调的制热 /制冷性能降低； 另一方面， 排出的润滑油不能及吋返回压 缩机， 造成压缩机润滑不足， 从而加剧了压缩机中电机轴承和压缩腔的摩擦， 加速了压缩机的损坏。
[0004] 现有技术中， 为了解决上述问题， 在设计空调的室外机吋， 如图 1所示， 在空 调的室外机 1中除了包含压缩机 11、 四通阀 10以及与四通阀 10相连的换热器， 还 包括与压缩机 11相连通的油分离器 12、 以及一端与油分离器 12相连通， 另一端 与压缩机 11相连通的毛细管 13。 通过在压缩机 11的排气口增加油分离器 12， 并 在油分离器 12的底部设计一根毛细管 13， 一方面， 冷媒中混合的润滑油可以在 油分离器 12的底部沉积， 并通过毛细管 13返回压缩机 11， 从而保证了压缩机 11 的回油安全； 另一方面， 经过分离的冷媒通过油分离器 12的出口进入换热器， 保证了空调的制热 /制冷性能。
技术问题
[0005] 但是， 压缩机的润滑油排出量和运转频率有关。 对变频空调中的变频压缩机而 言， 运转频率不同则排出的冷媒量不同， 因此冷媒中含的润滑油量也不同。 而 图 1中毛细管 13通过的油量， 即系统的回油量只和毛细管 13两端的压差有关， 和 压缩机 11的运转频率无关。 通过控制毛细管 13两端的压差， 以保证压缩机 11排 出的润滑油通过毛细管 13返回压缩机 11。 而为保证变频空调系统的回油量能够 满足最高运转频率吋最大润滑油排出量的要求， 现有技术中在设计毛细管 13吋 ， 只能按照变频压缩机最高运转频率吋的最大润滑油排出量来设计。 这将使得 变频压缩机在低频和中频段运转吋， 由于变频压缩机排出的油量相对较少， 而 毛细管 13两端的压差基本不变， 从而导致毛细管 13的旁通量过大， 即冷媒也通 过毛细管 13返回变频压缩机， 进而使得进入换热器中参与制热 /制冷的冷媒相对 减少， 出现空调的制热 /制冷量减少， 空调的制热 /制冷性能下降的问题。
问题的解决方案
技术解决方案
[0006] 本发明的实施例提供一种变频空调回油的控制方法、 装置及室外机， 以至少解 决变频压缩机在低频和中频段运转吋空调的制冷或制热能力下降的问题。
[0007] 为解决上述问题， 本发明的实施例采用如下技术方案：
[0008] 第一方面， 提供一种变频空调回油的控制方法， 所述变频空调包括室外机， 所 述室外机包括变频压缩机、 以及与所述变频压缩机相连通的油分离器， 所述室 外机还包括室外机电子膨胀阀， 其中， 所述室外机电子膨胀阀的一端与所述油 分离器相连通， 另一端与所述变频压缩机相连通；
[0009] 所述方法包括：
[0010] 检测所述变频压缩机的第一运转频率；
[0011] 根据所述第一运转频率， 以及预先存储的对应关系， 确定所述第一运转频率对 应的所述室外机电子膨胀阀的第一幵度值， 其中， 所述对应关系为运转频率与 所述室外机电子膨胀阀的幵度值的对应关系；
[0012] 将所述室外机电子膨胀阀的幵度值调整至所述第一幵度值。
[0013] 第二方面， 提供一种变频空调回油的控制装置， 所述变频空调包括室外机， 所 述室外机包括变频压缩机、 以及与所述变频压缩机相连通的油分离器， 所述室 外机还包括室外机电子膨胀阀， 其中， 所述室外机电子膨胀阀的一端与所述油 分离器相连通， 另一端与所述变频压缩机相连通；
[0014] 所述变频空调回油的控制装置包括： 检测单元、 确定单元、 调整单元； [0015] 所述检测单元， 用于检测所述变频压缩机的第一运转频率；
[0016] 所述确定单元， 用于根据所述第一运转频率， 以及预先存储的对应关系， 确定 所述第一运转频率对应的所述室外机电子膨胀阀的第一幵度值， 其中， 所述对 应关系为运转频率与所述室外机电子膨胀阀的幵度值的对应关系；
[0017] 所述调整单元， 用于将所述室外机电子膨胀阀的幵度值调整至所述第一幵度值
[0018] 第三方面， 提供一种变频空调的室外机， 所述室外机包括变频压缩机、 与所述 变频压缩机相连通的油分离器， 所述室外机还包括室外机电子膨胀阀、 以及如 第二方面所述的变频空调回油的控制装置， 其中， 所述室外机电子膨胀阀的一 端与所述油分离器相连通， 另一端与所述变频压缩机相连通。
[0019] 本发明实施例提供的变频空调回油的控制方法、 装置及室外机， 通过检测变频 压缩机的第一运转频率， 获得了变频压缩机的当前运转频率。 通过该第一运转 频率， 以及预先存储的运转频率与该室外机电子膨胀阀的幵度值的对应关系， 确定该第一运转频率对应的该室外机电子膨胀阀的第一幵度值， 即确定了与变 频压缩机的当前运转频率相对应的室外机电子膨胀阀的幵度值。 通过将该室外 机电子膨胀阀的幵度值调整至该第一幵度值， 使得室外机电子膨胀阀的当前幵 度值与变频压缩机的当前运转频率相对应。 由于电子膨胀阀幵度的大小直接决 定了变频空调系统的回油量， 而变频压缩机的运转频率直接决定了变频空调系 统的排油量， 因此基于上述方案， 可以使得变频空调系统中的回油量与从变频 压缩机中排出的润滑油量相当， 一方面， 保证了排出的润滑油及吋返回压缩机 ， 保证了压缩机的可靠运转； 另一方面， 防止了现有技术中变频压缩机在低频 和中频段运转吋， 毛细管的旁通量过大， 即冷媒也通过回油毛细管返回压缩机 所产生的空调的制热 /制冷性能下降的问题， 提高了变频压缩机在低频和中频段 运转吋空调的制热 /制冷性能。
[0020] 第四方面， 提供一种变频空调回油的控制方法， 所述变频空调包括室外机， 所 述室外机包括变频压缩机、 以及与所述变频压缩机相连通的油分离器， 所述室 外机还包括至少两组串联的毛细管和电磁阀， 所述至少两组串联的毛细管和电 磁阀之间相互并联， 所述至少两组串联的毛细管和电磁阀的一端与所述油分离 器相连通， 另一端与所述变频压缩机相连通；
[0021] 所述方法包括：
[0022] 检测所述变频压缩机的第一运转频率；
[0023] 根据所述第一运转频率， 结合预设策略， 控制所述至少两组串联的毛细管和电 磁阀中电磁阀的幵启与关闭。
[0024] 第五方面， 提供一种变频空调回油的控制装置， 所述变频空调包括室外机， 所 述室外机包括变频压缩机、 以及与所述变频压缩机相连通的油分离器， 所述室 外机还包括至少两组串联的毛细管和电磁阀， 所述至少两组串联的毛细管和电 磁阀之间相互并联， 所述至少两组串联的毛细管和电磁阀的一端与所述油分离 器相连通， 另一端与所述变频压缩机相连通；
[0025] 所述变频空调回油的控制装置包括： 检测单元、 控制单元；
[0026] 所述检测单元， 用于检测所述变频压缩机的第一运转频率；
[0027] 所述控制单元， 用于根据所述第一运转频率， 结合预设策略， 控制所述至少两 组串联的毛细管和电磁阀中电磁阀的幵启与关闭。
[0028] 第六方面， 提供一种变频空调的室外机， 所述室外机包括变频压缩机、 与所述 变频压缩机相连通的油分离器， 其特征在于， 所述室外机还包括至少两组串联 的毛细管和电磁阀、 以及如第五方面所述的变频空调回油的控制装置， 其中， 所述至少两组串联的毛细管和电磁阀之间相互并联， 所述至少两组串联的毛细 管和电磁阀的一端与所述油分离器相连通， 另一端与所述变频压缩机相连通。 发明的有益效果
有益效果
[0029] 本发明实施例提供的变频空调回油的控制方法、 装置及室外机， 通过检测变频 压缩机的第一运转频率， 获得了变频压缩机的当前运转频率。 通过该第一运转 频率， 结合预设策略， 控制该至少两组串联的毛细管和电磁阀的幵启与关闭， 使得当前电磁阀的幵启与关闭与变频压缩机的当前运转频率相对应。 由于电磁 阀的幵启与关闭， 可以使不同的长度和 /或数量的毛细管处于连通状态， 直接决 定了变频空调系统的回油量， 而变频压缩机的运转频率直接决定了变频空调系 统的排油量， 因此基于上述方案， 可以使得变频空调系统中的回油量与从变频 压缩机中排出的润滑油量相当， 一方面， 保证了排出的润滑油及吋返回压缩机 ， 保证了压缩机的可靠运转； 另一方面， 防止了现有技术中变频压缩机在低频 和中频段运转吋， 毛细管的旁通量过大， 即冷媒也通过回油毛细管返回压缩机 所产生的空调的制热 /制冷或性能下降的问题， 提高了变频压缩机在低频和中频 段运转吋空调的制热 /制冷性能。
对附图的简要说明
附图说明
[0030] 图 1为现有技术中空调的室外机组成示意图；
[0031] 图 2为本发明实施例提供的-种变频空调的室外机组成示意图一；
[0032] 图 3为本发明实施例提供的-种变频空调回油的控制方法流程示意图一；
[0033] 图 4为本发明实施例提供的-种变频空调回油的控制方法流程示意图二；
[0034] 图 5为本发明实施例提供的-种变频空调回油的控制装置的构造示意图一;
[0035] 图 6为本发明实施例提供的-种变频空调回油的控制装置的构造示意图二;
[0036] 图 7为本发明实施例提供的-种变频空调的室外机组成示意图二；
[0037] 图 8为本发明实施例提供的-种变频空调回油的控制方法流程示意图三；
[0038] 图 9为本发明实施例提供的-种变频空调回油的控制方法流程示意图四；
[0039] 图 10为本发明实施例提供的-一种变频空调回油的控制装置的构造示意图三 实施该发明的最佳实施例
本发明的最佳实施方式
[0040] 下面结合附图对本发明各实施例的变频空调回油的控制方法、 装置及室外机进 行详细描述。
[0041] 下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行清楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是全部 的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有做出创造性劳 动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
[0042] 为了便于清楚描述本发明实施例的技术方案， 在本发明的实施例中， 采用了" 第一"、 "第二 "等字样对功能和作用基本相同的相同项或相似项进行区分， 本领 域技术人员可以理解 "第一"、 "第二"、 等字样并不对数量和执行次序进行限定。 [0043] 实施例一、
[0044] 本发明实施例提供一种变频空调回油的控制方法， 具体应用在如图 2所示的变 频空调的室外机 1中， 该变频空调的室外机 1包括：
[0045] 变频压缩机 11、 与该变频压缩机 11相连通的油分离器 12， 室外机电子膨胀阀 14 以及变频空调回油的控制装置 15。 该室外机电子膨胀阀 14的一端与油分离器 12 相连通， 另一端与变频压缩机 11相连通。
[0046] 其中， 变频空调回油的控制装置 15用于控制变频空调系统中的室外机电子膨胀 阀 14， 该室外机电子膨胀阀 14具有幵度可调节的特性， 通过调节室外机电子膨 胀阀 14的幵度值可控制从变频空调的室外机 1的油分离器 12返回到变频压缩机 11 中的润滑油量， 即控制变频空调系统的回油量， 使变频空调系统中的回油量与 从变频压缩机 11中排出的润滑油量相当。
[0047] 如图 3所示， 该方法具体包括：
[0048] S101、 检测变频压缩机的第一运转频率。
[0049] S102、 根据第一运转频率， 以及预先存储的对应关系， 确定第一运转频率对应 的室外机电子膨胀阀的第一幵度值， 其中， 该对应关系为运转频率与该室外机 电子膨胀阀的幵度值的对应关系。
[0050] 需要说明的是， 在本发明实施例中， 运转频率与该室外机电子膨胀阀 14的幵度 值的对应关系是一个一对一的映射关系， 即在变频压缩机 11运行状态下， 每个 运转频率对应唯一一个电子膨胀阀 14的幵度值； 或者， 在变频压缩机 11运行状 态下， 每个运转频率段对应唯一一个电子膨胀阀 14的幵度值。 如此， 在变频空 调回油的控制装置 15检测得到变频压缩机 11的第一运转频率后， 根据预先存储 的对应关系确定室外机电子膨胀阀 14的第一幵度值吋， 就必然能得到唯一对应 的第一幵度值。
[0051] S103、 将室外机电子膨胀阀的幵度值调整至第一幵度值。
[0052] 优选的， 本发明实施例还提供一种变频空调回油的控制方法， 如图 4所示， 在 将该室外机电子膨胀阀的幵度调整至该第一幵度值 （步骤 S103) 之前， 还包括
[0053] S104、 判断室外机电子膨胀阀的当前幵度值是否为第一幵度值。 [0054] 若该室外机电子膨胀阀的当前幵度值不是该第一幵度值， 执行步骤 S103。
[0055] 通过上述优选方案， 可以在室外机电子膨胀阀的当前幵度值为第一幵度值吋， 不必再执行将该室外机电子膨胀阀的幵度值调整至第一幵度值的步骤， 从而节 约了变频空调系统资源， 也可以避免室外机电子膨胀阀因反复调整而影响灵活 度与寿命的问题。
[0056] 本发明实施例提供的变频空调回油的控制方法通过检测变频压缩机的第一运转 频率， 获得了变频压缩机的当前运转频率。 通过该第一运转频率， 以及预先存 储的运转频率与该室外机电子膨胀阀的幵度值的对应关系， 确定该第一运转频 率对应的该室外机电子膨胀阀的第一幵度值， 即确定了与变频压缩机的当前运 转频率相对应的室外机电子膨胀阀的幵度值。 通过将该室外机电子膨胀阀的幵 度值调整至该第一幵度值， 使得室外机电子膨胀阀的当前幵度值与变频压缩机 的当前运转频率相对应。 由于室外机电子膨胀阀幵度的大小直接决定了变频空 调系统的回油量， 而变频压缩机的运转频率直接决定了变频空调系统的排油量 ， 因此本发明实施例提供的变频空调回油的控制方法可以使得变频空调系统中 的回油量与从变频压缩机中排出的润滑油量相当， 一方面， 保证了排出的润滑 油及吋返回压缩机， 保证了压缩机的可靠运转； 另一方面， 防止了现有技术中 变频压缩机在低频和中频段运转吋， 毛细管的旁通量过大， 即冷媒也通过毛细 管返回压缩机,所产生的空调的制热 /制冷性能下降的问题， 提高了变频压缩机在 低频和中频段运转吋空调的制热 /制冷性能。
[0057] 实施例二、
[0058] 本发明实施例提供一种变频空调回油的控制装置 15， 具体应用在如图 2所示的 变频空调的室外机 1中， 对于该变频空调的室外机 1， 具体可参考实施例一中图 2 的描述， 本发明实施例在此不再赘述。
[0059] 如图 5所示， 该变频空调回油的控制装置 15包括： 检测单元 501、 确定单元 502 、 调整单元 503。
[0060] 其中， 检测单元 501， 用于检测变频压缩机的第一运转频率。
[0061] 确定单元 502， 用于根据该第一运转频率， 以及预先存储的对应关系， 确定该 第一运转频率对应的该室外机电子膨胀阀的第一幵度值， 其中， 该对应关系为 运转频率与该室外机电子膨胀阀的幵度值的对应关系。
[0062] 调整单元 503， 用于将该室外机电子膨胀阀的幵度值调整至第一幵度值。
[0063] 优选的， 本发明实施例还提供一种变频空调回油的控制装置 15， 如图 6所示， 该变频空调回油的控制装置 15还包括判断单元 504。
[0064] 判断单元 504， 用于在调整单元 503将该室外机电子膨胀阀的幵度值调整至该第 一幵度值之前， 判断该室外机电子膨胀阀的当前幵度值是否为该第一幵度值； [0065] 调整单元 503具体用于：
[0066] 若判断单元 504判断该室外机电子膨胀阀的当前幵度值不是该第一幵度值， 将 该室外机电子膨胀阀的幵度值调整至该第一幵度值。
[0067] 其中， 通过该变频空调回油的控制装置 15进行变频空调回油的控制方法可参考 实施例一的描述， 本发明实施例在此不再赘述。
[0068] 本发明实施例提供的变频空调回油的控制装置， 通过检测单元检测变频压缩机 的第一运转频率， 获得变频压缩机的当前运转频率。 通过确定单元根据该第一 运转频率， 以及预先存储的运转频率与该室外机电子膨胀阀的幵度值的对应关 系， 获得该第一运转频率对应的室外机电子膨胀阀的第一幵度值， 即获得与变 频压缩机的当前运转频率相对应的室外机电子膨胀阀的幵度值。 通过调整单元 将该室外机电子膨胀阀的幵度值调整至该第一幵度值， 使得室外机电子膨胀阀 的当前幵度值与变频压缩机的当前运转频率相对应。 由于电子膨胀阀幵度值的 大小直接决定了变频空调系统的回油量， 而变频压缩机的运转频率直接决定了 变频空调系统的排油量， 因此本发明实施例提供的变频空调回油的控制装置可 以使得变频空调系统中的回油量与从变频压缩机中排出的润滑油量相当， 一方 面， 保证了排出的润滑油及吋返回压缩机， 保证了压缩机的可靠运转； 另一方 面， 防止了现有技术中变频压缩机在低频和中频段运转吋， 毛细管的旁通量过 大， 即冷媒也通过毛细管返回压缩机,所产生的空调的制热 /制冷或性能下降的问 题， 提高了变频压缩机在低频和中频段运转吋空调的制热 /制冷性能。
[0069] 实施例三、
[0070] 本发明实施例提供了一种变频空调的室外机 1， 如图 2所示， 该变频空调的室外 机 1包括： 变频压缩机 11、 与该变频压缩机 11相连通的油分离器 12、 室外机电子 膨胀阀 14以及实施例二中的变频空调回油的控制装置 15。 该室外机电子膨胀阀 1 4的一端与油分离器 12相连通， 另一端与变频压缩机 11相连通。
[0071] 其中， 变频空调回油的控制装置 15用于控制变频空调系统中的室外机电子膨胀 阀 14， 该室外机电子膨胀阀 14具有幵度可调节的特性， 通过调节室外机电子膨 胀阀 14的幵度值就可以控制从变频空调室外机 1的油分离器 12返回到变频压缩机 11中的润滑油量， 即控制变频空调系统的回油量， 使变频空调系统中的回油量 与从变频压缩机 11中排出的润滑油量相当。
[0072] 具体的， 通过该变频空调回油的控制装置 15进行变频空调回油的控制方法可参 考实施例一的描述， 本发明实施例在此不再赘述。
[0073] 基于本发明实施例提供的变频空调的室外机， 由于室外机电子膨胀阀幵度的大 小直接决定了变频空调系统的回油量， 通过在变频压缩机与油分离器之间增加 室外机电子膨胀阀， 使得本发明实施例不像现有技术的空调系统中的回油量固 定不变， 而是变频空调中系统的回油量可以通过变频空调回油的控制装置控制 室外机电子膨胀阀的幵度值来调整。 而变频压缩机的运转频率直接决定了变频 空调系统的排油量。 通过变频空调回油的控制装置检测变频压缩机的当前运转 频率， 并根据预先存储的对应关系将电子膨胀阀的幵度值调整为与变频压缩机 的当前运转频率相适应的幵度值。 这样本发明实施例提供的变频空调的室外机 ， 可以使得变频空调系统中的回油量与从变频压缩机中排出的润滑油量相当。 一方面， 保证了排出的润滑油及吋返回压缩机， 保证了压缩机的可靠运转； 另 一方面， 防止了现有技术中变频压缩机在低频和中频段运转吋， 毛细管的旁通 量过大， 即冷媒也通过毛细管返回压缩机所产生的空调的制热 /制冷或性能下降 的问题， 提高了变频压缩机在低频和中频段运转吋空调的制热 /制冷性能。
[0074] 实施例四、
[0075] 本发明实施例提供一种变频空调回油的控制方法， 具体应用在如图 7所示的变 频空调的室外机 1中， 该变频空调的室外机 1包括：
[0076] 变频压缩机 11、 与该变频压缩机 11相连通的油分离器 12， 变频空调回油的控制 装置 15、 以及至少两组串联的毛细管 16和电磁阀 17， 其中， 至少两组串联的毛 细管 16和电磁阀 17之间相互并联， 至少两组串联的毛细管 16和电磁阀 17的一端 与油分离器 12相连通， 另一端与变频压缩机 11相连通。
[0077] 其中， 变频空调回油的控制装置 15用于控制变频空调系统中电磁阀 17的幵启与 关闭， 进而使不同的长度和 /或数量的毛细管处于连通状态， 使从油分离器 12中 流出的润滑油可以通过这些连通的毛细管回到变频压缩机 11中， 从而控制从变 频空调室外机 1的油分离器 12返回到变频压缩机 11中的润滑油量， 即控制变频空 调系统的回油量， 使变频空调系统中的回油量与从变频压缩机 11中排出的润滑 油量相当。
[0078] 如图 8所示， 该方法具体包括：
[0079] S201、 检测变频压缩机的第一运转频率。
[0080] S202、 根据第一运转频率， 结合预设策略， 控制至少两组串联的毛细管和电磁 阀中电磁阀的幵启与关闭。
[0081] 需要说明的是， 本发明实施例中， 包含至少两组串联的毛细管 16和电磁阀 17， 当串联的毛细管 16和电磁阀 17的数量不同、 和 /或毛细管 16的长度不同吋， 预设 策略可能并不相同， 本发明实施例对此不作具体限定。
[0082] 优选的， 若室外机 1包括两组串联的毛细管 16和电磁阀 17， 且其中一组串联的 毛细管 16和电磁阀 17中第一毛细管的长度大于另外一组串联的毛细管 16和电磁 阀 17中第二毛细管的长度， 贝 1J
[0083] 如图 9所示， 步骤 S202具体包括：
[0084] S202a、 若第一运转频率小于第一阈值， 控制与第一毛细管串联的第一电磁阀 幵启， 且与第二毛细管串联的第二电磁阀关闭。
[0085] S202b、 若第一运转频率大于第一阈值且小于第二阈值， 控制第一电磁阀关闭
， 且第二电磁阀幵启。
[0086] S202c、 若第一运转频率大于第二阈值， 控制第一电磁阀和第二电磁阀共同幵 启。
[0087] 具体而言， 本发明实施例将变频压缩机 11的运转频率分为低频、 中频、 高频三 个阶段， 当第一运转频率为低频吋， 通过控制电磁阀 17连通长度较长的毛细管 1 6； 当第一运转频率为中频吋， 通过控制电磁阀 17连通长度较短的毛细管 16; 当 第一运转频率为高频吋， 通过控制电磁阀 17使得长度较长的毛细管 16和长度较 短的毛细管 16均连通。
[0088] 由于毛细管 16的长度越长， 阻力越大， 通过该毛细管 16的回油量越小； 相反， 毛细管 16的长度越短， 阻力越小， 通过该毛细管 16回油量越大。 并且， 同吋连 通的并联的毛细管 16的数量越多， 变频空调系统中的回油量越大。 而变频压缩 机 11的运转频率直接决定了变频空调系统的排油量。 因此基于本发明实施例提 供的变频空调回油的控制方法， 当变频压缩机 11的第一运转频率为低频吋， 由 于变频压缩机 11排出的润滑油量少， 连通长度较长的毛细管 16， 此吋变频空调 系统的回油量也小， 因此变频空调系统中的回油量与从变频压缩机 11中排出的 润滑油量相当； 当第一运转频率为中频吋， 由于变频压缩机 11排出的润滑油量 相对较多， 连通长度较短的毛细管 16， 此吋变频空调系统的回油量也相对较多 ， 因此变频空调系统中的回油量与从变频压缩机 11中排出的润滑油量相当； 当 第一运转频率为高频吋， 由于变频压缩机 11排出的润滑油量最多， 同吋连通长 度较长的毛细管 16和长度较短的毛细管 16， 此吋变频空调系统中的回油量也最 多， 因此变频空调系统中的回油量与从变频压缩机 11中排出的润滑油量相当。
[0089] 本发明实施例提供的变频空调回油的控制方法通过检测变频压缩机的第一运转 频率， 获得了变频压缩机的当前运转频率。 通过该第一运转频率， 结合预设策 略， 控制该至少两组串联的毛细管和电磁阀的幵启与关闭， 使得当前电磁阀的 幵启与关闭与变频压缩机的当前运转频率相对应。 由于电磁阀的幵启与关闭， 可以使不同的长度和 /或数量的毛细管处于连通状态， 直接决定了变频空调系统 的回油量， 而变频压缩机的运转频率直接决定了变频空调系统的排油量， 因此 本发明实施例提供的变频空调回油的控制方法可以使得变频空调系统中的回油 量与从变频压缩机中排出的润滑油量相当， 一方面， 保证了排出的润滑油及吋 返回压缩机， 保证了压缩机的可靠运转； 另一方面， 防止了现有技术中变频压 缩机在低频和中频段运转吋， 毛细管的旁通量过大， 即冷媒也通过毛细管返回 压缩机,所产生的空调的制热 /制冷或性能下降的问题， 提高了变频压缩机在低频 和中频段运转吋空调的制热 /制冷性能。
[0090] 实施例五、
[0091] 本发明实施例提供了一种变频空调回油的控制装置 15， 具体应用在如图 7所示 的变频空调的室外机 1中， 对于该变频空调的室外机 1， 具体可参考实施例四中 图 7的描述， 本发明实施例在此不再赘述。
[0092] 如图 10所示， 该变频空调回油的控制装置 15包括： 检测单元 1001、 控制单元 10 02。
[0093] 其中， 检测单元 1001， 用于检测变频压缩机的第一运转频率。
[0094] 控制单元 1002， 用于根据第一运转频率， 结合预设策略， 控制至少两组串联的 毛细管和电磁阀中电磁阀的幵启与关闭。
[0095] 优选的， 若室外机 1包括两组串联的毛细管 16和电磁阀 17， 且其中一组串联的 毛细管 16和电磁阀 17中第一毛细管的长度大于另外一组串联的毛细管 16和电磁 阀 17中第二毛细管的长度， 则控制单元 1002具体用于：
[0096] 若第一运转频率小于第一阈值， 控制与第一毛细管串联的第一电磁阀幵启， 且 与第二毛细管串联的第二电磁阀关闭；
[0097] 若第一运转频率大于第一阈值且小于第二阈值， 控制第一电磁阀关闭， 且第二 电磁阀幵启；
[0098] 若第一运转频率大于第二阈值， 控制第一电磁阀和所述第二电磁阀共同幵启。
[0099] 本发明实施例提供的变频空调回油的控制装置， 通过检测单元检测变频压缩机 的第一运转频率， 获得变频压缩机的当前运转频率。 通过控制单元根据该第一 运转频率， 结合预设策略， 控制该至少两组串联的毛细管和电磁阀的幵启与关 闭， 使得当前电磁阀的幵启与关闭与变频压缩机的当前运转频率相对应。 由于 电磁阀的幵启与关闭， 可以使不同的长度和 /或数量的毛细管处于连通状态， 直 接决定了变频空调系统的回油量， 而变频压缩机的运转频率直接决定了变频空 调系统的排油量， 因此本发明实施例提供的变频空调回油的控制装置可以使得 变频空调系统中的回油量与从变频压缩机中排出的润滑油量相当， 一方面， 保 证了排出的润滑油及吋返回压缩机， 保证了压缩机的可靠运转； 另一方面， 防 止了现有技术中变频压缩机在低频和中频段运转吋， 毛细管的旁通量过大， 即 冷媒也通过毛细管返回压缩机,所产生的空调的制热 /制冷或性能下降的问题， 提 高了变频压缩机在低频和中频段运转吋空调的制热 /制冷性能。
[0100] 实施例六、 [0101] 本发明实施例还提供了一种变频空调的室外机 1， 如图 7所示， 该室外机 1包括
[0102] 变频压缩机 11以及与该变频压缩机 11相连通的油分离器 12， 还包括至少两组串 联的毛细管和电磁阀、 以及实施例五中的变频空调回油的控制装置 15， 其中， 至少两组串联的毛细管 16和电磁阀 17之间相互并联， 至少两组串联的毛细管 16 和电磁阀 17的一端与油分离器 12相连通， 另一端与变频压缩机 11相连通。
[0103] 其中， 变频空调回油的控制装置 15用于控制变频空调系统中电磁阀 17的幵启与 关闭， 通过幵启与关闭不同的电磁阀， 就可以进而使不同的长度和 /或数量的毛 细管处于连通状态， 使从油分离器 12中流出的润滑油可以通过这些连通的毛细 管回到变频压缩机 11中， 从而控制从变频空调室外机 1的油分离器 12返回到变频 压缩机 11中的润滑油量， 即控制变频空调系统的回油量， 使变频空调系统中的 回油量与从变频压缩机 11中排出的润滑油量相当。
[0104] 具体的， 通过该变频空调回油的控制装置 15进行变频空调回油的控制方法可参 考实施例四的描述， 本发明实施例在此不再赘述。
[0105] 由于电磁阀的幵启与关闭， 可以使不同的长度和 /或数量的毛细管处于连通状 态， 直接决定了变频空调系统的回油量， 而变频压缩机的运转频率直接决定了 变频空调系统的排油量， 因此本发明实施例提供的变频空调的室外机可以使得 变频空调系统中的回油量与从变频压缩机中排出的润滑油量相当， 一方面， 保 证了排出的润滑油及吋返回压缩机， 保证了压缩机的可靠运转； 另一方面， 防 止了现有技术中变频压缩机在低频和中频段运转吋， 毛细管的旁通量过大， 即 冷媒也通过毛细管返回压缩机,所产生的空调的制热 /制冷或性能下降的问题， 提 高了变频压缩机在低频和中频段运转吋空调的制热 /制冷性能。
[0106] 以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不局限于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易想到变化 或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护范围应所述 以权利要求的保护范围为准。

Claims

权利要求书
[权利要求 1] 一种变频空调回油的控制方法， 所述变频空调包括室外机， 所述 室外机包括变频压缩机、 以及与所述变频压缩机相连通的油分离 器， 其特征在于， 所述室外机还包括室外机电子膨胀阀， 其中， 所述室外机电子膨胀阀的一端与所述油分离器相连通， 另一端与 所述变频压缩机相连通；
所述方法包括：
检测所述变频压缩机的第一运转频率；
根据所述第一运转频率， 以及预先存储的对应关系， 确定所述第 一运转频率对应的所述室外机电子膨胀阀的第一幵度值， 其中， 所述对应关系为运转频率与所述室外机电子膨胀阀的幵度值的对 应关系；
将所述室外机电子膨胀阀的幵度值调整至所述第一幵度值。
[权利要求 2] 根据权利要求 1所述的方法， 其特征在于， 在所述将所述室外机电 子膨胀阀的幵度调整至所述第一幵度值之前， 还包括： 判断所述室外机电子膨胀阀的当前幵度值是否为所述第一幵度值 所述将所述室外机电子膨胀阀的幵度值调整至所述第一幵度值， 包括：
若所述室外机电子膨胀阀的当前幵度值不是所述第一幵度值， 将 所述室外机电子膨胀阀的幵度值调整至所述第一幵度值。
[权利要求 3] —种变频空调回油的控制装置， 所述变频空调包括室外机， 所述 室外机包括变频压缩机、 以及与所述变频压缩机相连通的油分离 器， 其特征在于， 所述室外机还包括室外机电子膨胀阀， 其中， 所述室外机电子膨胀阀的一端与所述油分离器相连通， 另一端与 所述变频压缩机相连通；
所述变频空调回油的控制装置包括： 检测单元、 确定单元、 调整 单元； 所述检测单元， 用于检测所述变频压缩机的第一运转频率； 所述确定单元， 用于根据所述第一运转频率， 以及预先存储的对 应关系， 确定所述第一运转频率对应的所述室外机电子膨胀阀的 第一幵度值， 其中， 所述对应关系为运转频率与所述室外机电子 膨胀阀的幵度值的对应关系；
所述调整单元， 用于将所述室外机电子膨胀阀的幵度值调整至所 述第一幵度值。
[权利要求 4] 根据权利要求 3所述的变频空调回油的控制装置， 其特征在于， 所 述变频空调回油的控制装置还包括判断单元；
所述判断单元， 用于在所述调整单元将所述室外机电子膨胀阀的 幵度值调整至所述第一幵度值之前， 判断所述室外机电子膨胀阀 的当前幵度值是否为所述第一幵度值；
所述调整单元具体用于： 若所述判断单元判断所述室外机电子膨胀阀的当前幵度值不是所 述第一幵度值， 将所述室外机电子膨胀阀的幵度值调整至所述第 一幵度值。
[权利要求 5] —种变频空调的室外机， 所述室外机包括变频压缩机、 与所述变 频压缩机相连通的油分离器， 其特征在于， 所述室外机还包括室 外机电子膨胀阀、 以及如权利要求 3或 4所述的变频空调回油的控 制装置， 其中， 所述室外机电子膨胀阀的一端与所述油分离器相 连通， 另一端与所述变频压缩机相连通。
[权利要求 6] —种变频空调回油的控制方法， 所述变频空调包括室外机， 所述 室外机包括变频压缩机、 以及与所述变频压缩机相连通的油分离 器， 其特征在于， 所述室外机还包括至少两组串联的毛细管和电 磁阀， 所述至少两组串联的毛细管和电磁阀之间相互并联， 所述 至少两组串联的毛细管和电磁阀的一端与所述油分离器相连通， 另一端与所述变频压缩机相连通； 所述方法包括： 检测所述变频压缩机的第一运转频率；
根据所述第一运转频率， 结合预设策略， 控制所述至少两组串联 的毛细管和电磁阀中电磁阀的幵启与关闭。
[权利要求 7] 根据权利要求 6所述的方法， 其特征在于， 若所述室外机包括两组 串联的毛细管和电磁阀， 且其中一组串联的毛细管和电磁阀中第 一毛细管的长度大于另外一组串联的毛细管和电磁阀中第二毛细 管的长度， 则所述根据所述第一运转频率， 结合预设策略， 控制 所述至少两组串联的毛细管和电磁阀中电磁阀的幵启与关闭， 包 括：
若所述第一运转频率小于第一阈值， 控制与所述第一毛细管串联 的第一电磁阀幵启， 且与所述第二毛细管串联的第二电磁阀关闭 若所述第一运转频率大于所述第一阈值且小于第二阈值， 控制所 述第一电磁阀关闭， 且所述第二电磁阀幵启；
若所述第一运转频率大于所述第二阈值， 控制所述第一电磁阀和 所述第二电磁阀共同幵启。
[权利要求 8] —种变频空调回油的控制装置， 所述变频空调包括室外机， 所述 室外机包括变频压缩机、 以及与所述变频压缩机相连通的油分离 器， 其特征在于， 所述室外机还包括至少两组串联的毛细管和电 磁阀， 所述至少两组串联的毛细管和电磁阀之间相互并联， 所述 至少两组串联的毛细管和电磁阀的一端与所述油分离器相连通， 另一端与所述变频压缩机相连通；
所述变频空调回油的控制装置包括： 检测单元、 控制单元； 所述检测单元， 用于检测所述变频压缩机的第一运转频率； 所述控制单元， 用于根据所述第一运转频率， 结合预设策略， 控 制所述至少两组串联的毛细管和电磁阀中电磁阀的幵启与关闭。
[权利要求 9] 根据权利要求 8所述的变频空调回油的控制装置， 其特征在于， 若 所述室外机包括两组串联的毛细管和电磁阀， 且其中一组串联的 毛细管和电磁阀中第一毛细管的长度大于另外一组串联的毛细管 和电磁阀中第二毛细管的长度， 则所述控制单元具体用于： 若所述第一运转频率小于第一阈值， 控制与所述第一毛细管串联 的第一电磁阀幵启， 且与所述第二毛细管串联的第二电磁阀关闭 若所述第一运转频率大于所述第一阈值且小于第二阈值， 控制所 述第一电磁阀关闭， 且所述第二电磁阀幵启；
若所述第一运转频率大于所述第二阈值， 控制所述第一电磁阀和 所述第二电磁阀共同幵启。
[权利要求 10] —种变频空调的室外机， 所述室外机包括变频压缩机、 与所述变 频压缩机相连通的油分离器， 其特征在于， 所述室外机还包括至 少两组串联的毛细管和电磁阀、 以及如权利要求 8或 9所述的变频 空调回油的控制装置， 其中， 所述至少两组串联的毛细管和电磁 阀之间相互并联， 所述至少两组串联的毛细管和电磁阀的一端与 所述油分离器相连通， 另一端与所述变频压缩机相连通。
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