CN110131856B - Air conditioner and control method thereof - Google Patents

Air conditioner and control method thereof Download PDF

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Publication number
CN110131856B
CN110131856B CN201910420106.XA CN201910420106A CN110131856B CN 110131856 B CN110131856 B CN 110131856B CN 201910420106 A CN201910420106 A CN 201910420106A CN 110131856 B CN110131856 B CN 110131856B
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Prior art keywords
control valve
air conditioner
compressor
temperature
air
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CN110131856A (en
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苏仁杰
侯泽飞
卢景斌
王庆仙
游劭磊
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F24F11/67—Switching between heating and cooling modes
    • 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
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioner and a control method thereof, wherein the air conditioner comprises: a compressor having a return air port and an exhaust port; the reversing assembly comprises an exhaust interface, an air return interface, an indoor interface and an outdoor interface; an indoor heat exchanger; an outdoor heat exchanger; the first end of the first control valve and the first end of the second control valve are both connected with the air return interface, and the second end of the first control valve is connected with the air return port; the heating device is used for heating the refrigerant flowing through the heating device; and the controller is respectively and electrically connected with the first temperature detection device, the second temperature detection device, the first control valve and the second control valve so as to control the on-off of the first control valve and the on-off of the second control valve according to the detection results of the first temperature detection device and the second temperature detection device. The air conditioner of the invention can improve the return air superheat degree of the compressor, is beneficial to realizing the high-efficiency and reliable operation of the air conditioner and has low cost.

Description

Air conditioner and control method thereof
Technical Field
The invention relates to the technical field of air conditioning, in particular to an air conditioner and a control method of the air conditioner.
Background
In the related technology, the gas-supplementing type enhanced vapor injection compressor is adopted to improve the low-temperature heating performance of the compressor, the method can enable the refrigerant to enter a cavity of the compressor with liquid, and the compressor sucks air for a long time and operates with liquid, so that the service life of the compressor can be shortened seriously, and the working reliability of the compressor is reduced; in addition, if the two-stage compressor is adopted to enhance the low-temperature heating performance of the compressor, the air conditioner has high cost, large occupied area and difficult control. Therefore, how to improve the energy efficiency of the air conditioner and reduce the cost is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the air conditioner which can improve the return air superheat degree of the compressor, is beneficial to realizing the efficient and reliable operation of the air conditioner and has low cost.
The invention also provides a control method of the air conditioner.
An air conditioner according to an embodiment of the present invention includes: a compressor having a return air port and an exhaust port; the exhaust port is connected with the exhaust port; the first end of the indoor heat exchanger is connected with the indoor interface; the first end of the outdoor heat exchanger is connected with the outdoor interface, and a throttling element is connected in series between the second end of the outdoor heat exchanger and the second end of the indoor heat exchanger; the first end of the first control valve and the first end of the second control valve are both connected with the air return interface, and the second end of the first control valve is connected with the air return port; the heating device is used for heating the refrigerant flowing through the heating device, and comprises a refrigerant inlet and a refrigerant outlet, the refrigerant inlet is connected with the second end of the second control valve, and the refrigerant outlet is connected with the air return port; the temperature control device comprises a first temperature detection device and a second temperature detection device, wherein the first temperature detection device is used for detecting the exhaust temperature of the compressor, and the second temperature detection device is used for detecting the return air temperature of the compressor; and the controller is respectively and electrically connected with the first temperature detection device, the second temperature detection device, the first control valve and the second control valve so as to control the on-off of the first control valve and the on-off of the second control valve according to the detection results of the first temperature detection device and the second temperature detection device.
According to the air conditioner provided by the embodiment of the invention, the controller can control the on-off of the first control valve and the on-off of the second control valve according to the detection results of the first temperature detection device and the second temperature detection device, so that whether a refrigerant flows through the heating device can be controlled to adjust the suction superheat degree of the compressor, the low-temperature heating performance and the high-temperature refrigerating performance of the air conditioner can be ensured, the efficient and reliable operation of the air conditioner can be realized, and meanwhile, the air conditioner is simple in structure, small in occupied area and low in cost.
In some embodiments of the present invention, the heating device is a regenerative heat exchanger, and the heating device is disposed outside a casing of the compressor to exchange heat with the compressor.
In some embodiments of the invention, at least one of the first temperature detection device and the second temperature detection device is a temperature sensor.
In some embodiments of the invention, at least one of the first control valve and the second control valve is a solenoid valve.
In some embodiments of the present invention, the reversing component is a four-way valve.
According to the control method of the air conditioner provided by the embodiment of the invention, the air conditioner is the air conditioner, and the control method comprises the following steps:
judging the current operation mode of the air conditioner, and detecting the outdoor ambient temperature TRing (C)Detecting the discharge temperature T of the compressorpAnd the return air temperature Th；
In the heating mode, at TRing (C)＜T0And TPAnd ThWhen the relation between the first control valve and the second control valve meets at least one of the first condition and the third condition, controlling the first control valve to be closed and controlling the second control valve to be opened;
in the cooling mode, at TRing (C)＞T1And TPAnd ThWhen the relation between the first control valve and the second control valve meets at least one of the first condition and the second condition, the first control valve is controlled to be closed and the second control valve is controlled to be opened, wherein T is1＞T0；
The first condition is as follows: t ishAnd TPSatisfies the following conditions: t isp-Th＞Tmax；
And a second condition: in the cooling mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax1；
And (3) carrying out a third condition: heating mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax2Wherein P ismax1＞Pmax2。
According to the control method of the air conditioner provided by the embodiment of the invention, the outdoor environment temperature T is detectedRing (C)Exhaust temperature T of compressorPAnd the suction temperature T of the compressorhWhether the suction superheat degree of the compressor needs to be improved or not is judged, and when the suction superheat degree of the compressor needs to be improved, the refrigerant is heated by utilizing the heat drawn from the heating device, so that the suction superheat degree of the compressor is increased, efficient and reliable operation of an air conditioner is guaranteed, and meanwhile, the control is simple, and the production cost is reduced.
In some embodiments of the invention, the T0Satisfies the following conditions: t is not less than 0 DEG C0≤4℃。
In some embodiments of the invention, the T1Satisfies the following conditions: t is not less than 33 DEG C1≤36℃。
In some embodiments of the invention, the TmaxSatisfies the following conditions: t is more than or equal to 74 DEG Cmax≤80℃。
In some embodiments of the invention, said Pmax1Satisfies the following conditions: p is more than or equal to 8max1Less than or equal to 10, said Pmax2Satisfies the following conditions: 2 is less than or equal to Pmax2≤5。
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic refrigerant flow diagram of an air conditioner according to an embodiment of the present invention, wherein the air conditioner is in a heating mode;
fig. 2 is a schematic refrigerant flow direction diagram of an air conditioner according to an embodiment of the present invention, wherein the air conditioner is in a cooling mode;
fig. 3 is a flowchart illustrating a control method of an air conditioner according to some embodiments of the present invention;
fig. 4 is a schematic view of a control method of an air conditioner according to some embodiments of the present invention;
fig. 5 is a schematic view of a control method of an air conditioner according to other embodiments of the present invention.
Reference numerals:
an air conditioner 100;
a compressor 1; an exhaust port 11; a return air port 12;
a reversing component 2; an exhaust interface 21; a return air interface 22; an indoor interface 23; an outdoor interface 24;
an indoor heat exchanger 3; an outdoor heat exchanger 4; a throttling element 5;
a heating device 6; a refrigerant inlet 61; a refrigerant outlet 62;
a first control valve 7;
a second control valve 8;
a first temperature detection device 101;
a second temperature detection device 102;
and a third temperature detection device 103.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
An air conditioner 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.
Referring to fig. 1, an air conditioner 100 according to an embodiment of the present invention may include a compressor 1, a reversing assembly 2, an indoor heat exchanger 3, an outdoor heat exchanger 4, a first control valve 7, a second control valve 8, a throttling element 5, a heating device 6, a first temperature detecting device 101, a second temperature detecting device 102, and a controller (not shown).
As shown in fig. 1, the compressor 1 has a return port 12 and an exhaust port 11, and a refrigerant can enter the compressor 1 through the return port 12, be compressed by the compressor 1, and then be discharged through the exhaust port 11.
As shown in fig. 1, the reversing assembly 2 includes an exhaust port 21, a return port 22, an indoor port 23 and an outdoor port 24, the exhaust port 21 is in switching communication with one of the indoor port 23 and the outdoor port 24, the return port 22 is in switching communication with the other of the indoor port 23 and the outdoor port 24, the exhaust port 21 is connected to the exhaust port 11, and the direction of refrigerant flow can be changed by operating the reversing assembly 2, so that the air conditioner 100 can be switched between a cooling function and a heating function.
As shown in fig. 1, a first end of the indoor heat exchanger 3 is connected to the indoor interface 23, a first end of the outdoor heat exchanger 4 is connected to the outdoor interface 24, a throttling element 5 is connected in series between a second end of the outdoor heat exchanger 4 and a second end of the indoor heat exchanger 3, and indoor air can exchange heat with the indoor heat exchanger 3 to adjust the temperature of the indoor environment.
As shown in fig. 1 and 2, the first end of the first control valve 7 and the first end of the second control valve 8 are both connected to the return air port 22, and the second end of the first control valve 7 is connected to the return air port 12.
As shown in fig. 1, the heating device 6 is used for heating the refrigerant flowing through the heating device 6, the heating device 6 includes a refrigerant inlet 61 and a refrigerant outlet 62, the refrigerant inlet 61 is connected to the second end of the second control valve 8, and the refrigerant outlet 62 is connected to the return port 12.
As shown in fig. 1, the first temperature detecting means 101 is used for detecting the discharge temperature of the compressor 1, and the second temperature detecting means 102 is used for detecting the return air temperature of the compressor 1.
Referring to fig. 1 and 2, the controller is electrically connected to the first temperature detecting device 101, the second temperature detecting device 102, the first control valve 7 and the second control valve 8, respectively, to control the on/off of the first control valve 7 and the on/off of the second control valve 8 according to the detection results of the first temperature detecting device 101 and the second temperature detecting device 102. Wherein, the solid arrows in fig. 1 refer to the refrigerant flow direction when the first control valve 7 is closed and the second control valve 8 is opened in the heating mode, and the right-angle arrows in fig. 1 refer to the refrigerant flow direction when the first control valve 7 is opened and the second control valve 8 is closed in the heating mode; the solid arrows in fig. 2 indicate the refrigerant flow direction when the first control valve 7 is closed and the second control valve 8 is opened in the cooling mode, and the right-angled arrows in fig. 2 indicate the refrigerant flow direction when the first control valve 7 is opened and the second control valve 8 is closed in the cooling mode.
Specifically, referring to fig. 2, when the air conditioner 100 is in the cooling mode, the high-temperature and high-pressure refrigerant compressed by the compressor 1 is discharged from the discharge port 11 and flows to the discharge port 21, then flows to the outdoor heat exchanger 4 through the outdoor port 24, then flows to the indoor heat exchanger 3 through the throttling element 5, and then sequentially flows through the indoor port 23 and the return port 22;
if the controller determines that the suction superheat degree of the compressor 1 needs to be increased according to the detection results of the first temperature detection device 101 and the second temperature detection device 102, as shown in fig. 2, the controller controls the first control valve 7 to be closed and controls the second control valve 8 to be opened, so that the refrigerant flowing out of the return air interface 22 flows to the heating device 6 through the second control valve 8, is heated by the heating device 6, and flows to the return air port 12 of the compressor 1, thereby completing the refrigeration cycle. Therefore, the suction superheat degree of the compressor 1 can be improved, the high-temperature refrigeration performance of the air conditioner 100 is guaranteed, and the high-efficiency reliable operation of the air conditioner 100 is guaranteed, so that the air conditioner 100 can operate efficiently and reliably, and meanwhile, the air conditioner 100 is simple in structure, small in occupied area and low in cost.
If the controller determines that the suction superheat degree of the compressor 1 does not need to be increased according to the detection results of the first temperature detection device 101 and the second temperature detection device 102, as shown in fig. 2, the controller controls the first control valve 7 to be opened and controls the second control valve 8 to be closed, so that the refrigerant flowing out of the return air interface 22 directly flows to the return air port 12 of the compressor 1 after passing through the first control valve 7, and the refrigeration cycle is completed.
Referring to fig. 1, when the air conditioner 100 is in the heating mode, a high-temperature and high-pressure refrigerant compressed by the compressor 1 is discharged from the discharge port 11 and flows to the discharge port 21, then flows to the indoor heat exchanger 3 through the indoor port 23, then flows to the outdoor heat exchanger 4 through the throttling element 5, and then sequentially flows through the outdoor port 24 and the return port 22;
if the controller determines that the suction superheat degree of the compressor 1 needs to be increased according to the detection results of the first temperature detection device 101 and the second temperature detection device 102, as shown in fig. 1, the controller controls the first control valve 7 to be closed and controls the second control valve 8 to be opened, so that the refrigerant flowing out of the return air interface 22 flows to the heating device 6 through the second control valve 8, is heated by the heating device 6, and flows to the return air port 12 of the compressor 1, thereby completing the heating cycle. Therefore, the suction superheat degree of the compressor 1 can be improved, the low-temperature heating performance of the air conditioner 100 is guaranteed, and the efficient and reliable operation of the air conditioner 100 is guaranteed, so that the air conditioner 100 can efficiently and reliably operate, and meanwhile, the air conditioner 100 is simple in structure, small in occupied area and low in cost.
If the controller determines that the suction superheat degree of the compressor 1 does not need to be increased according to the detection results of the first temperature detection device 101 and the second temperature detection device 102, as shown in fig. 2, the controller controls the first control valve 7 to be opened and the second control valve 8 to be closed, and the refrigerant flowing out of the return air interface 22 directly flows to the return air port 12 of the compressor 1 after passing through the first control valve 7, thereby completing the refrigeration cycle.
According to the air conditioner 100 of the embodiment of the invention, the controller can control the on-off of the first control valve 7 and the on-off of the second control valve 8 according to the detection results of the first temperature detection device 101 and the second temperature detection device 102, so that whether the refrigerant flows through the heating device 6 can be controlled to adjust the suction superheat degree of the compressor 1, the low-temperature heating performance and the high-temperature refrigerating performance of the air conditioner 100 can be ensured, the air conditioner 100 can operate efficiently and reliably, and meanwhile, the air conditioner 100 is simple in structure, small in floor area and low in cost.
In some embodiments of the present invention, as shown in fig. 1, the heating device 6 is a regenerative heat exchanger, and the heating device 6 is disposed outside the casing of the compressor 1 to exchange heat with the compressor 1. Therefore, the heat accumulating type heat exchanger arranged outside the compressor 1 can fully utilize the waste heat of the compressor 1, improve the energy utilization rate and reduce the operation cost of the air conditioner 100. Of course, the present invention is not limited thereto, and the heating device 6 may be an electric heater.
In some embodiments of the present invention, as shown in fig. 1, at least one of the first temperature detection device 101 and the second temperature detection device 102 is a temperature sensor. For example, one of the first temperature detection device 101 and the second temperature detection device 102 is a temperature sensor; for another example, the first temperature detection device 101 and the second temperature detection device 102 are both temperature sensors. Therefore, the first temperature detection device 101 and the second temperature detection device 102 can be made simple in structure, and production cost can be reduced.
In some examples, the first temperature detection device 101 and the second temperature detection device 102 are both temperature sensing bulbs.
In some embodiments of the present invention, as shown in fig. 1, at least one of the first control valve 7 and the second control valve 8 is a solenoid valve. For example, one of the first control valve 7 and the second control valve 8 is a solenoid valve; as another example, the first control valve 7 and the second control valve 8 are both solenoid valves. Therefore, the first control valve 7 and the second control valve 8 can be made simple in structure, and the production cost can be reduced.
In some embodiments of the present invention, as shown in FIG. 1, the reversing component 2 is a four-way valve. Therefore, the air conditioner 100 is convenient to realize the functions of cooling and heating, has a simple structure, and is beneficial to reducing the production cost.
According to the control method of the air conditioner 100 of the embodiment of the present invention, the air conditioner 100 is the air conditioner 100 according to the above-mentioned embodiment of the present invention, and the control method includes the following steps:
judging the current operation mode of the air conditioner 100, and detecting the outdoor ambient temperature TRing (C)Detecting the discharge temperature T of the compressor 1PAnd the return air temperature Th；
In the heating mode, at TRing (C)＜T0And TPAnd ThWhen the relationship between the first and second control valves satisfies at least one of the first and third conditions, the first control valve 7 is controlled to be closed and the second control valve 8 is controlled to be opened, so that, as shown in fig. 1, the refrigerant flows to the heating device 6 through the second control valve 8, and flows to the return air port 12 of the compressor 1 after being heated by the heating device 6, thereby improving the suction superheat degree of the compressor 1.
Wherein "T" isPAnd ThThe relationship therebetween satisfying at least one of the condition one and the condition three "may be understood as TPAnd ThThe relation between them satisfies one of the conditions one and three, or TPAnd ThThe relationship between them satisfies both the first and third conditions.
In addition, in the heating mode, when TRing (C)≥T0Or TPAnd ThWhen the relation between the first and the third conditions does not satisfy at least one of the first and the third conditions, the first control valve 7 is controlled to be opened and the second control valve 8 is controlled to be closed, and the refrigerant directly flows to the return air port 12 of the compressor 1.
In the cooling mode, at TRing (C)＞T1And TPAnd ThWhen the relationship between the first and second conditions is at least one of the first and second conditions, the first control valve 7 is controlled to be closed and the second control valve 8 is controlled to be opened, so that the refrigerant flows to the heating device 6 through the second control valve 8 and flows to the return air port 12 of the compressor 1 after being heated by the heating device 6, as shown in fig. 2, thereby improving the suction superheat degree of the compressor 1.
In addition, in the cooling mode, when TRing (C)≤T1Or TPAnd ThWhen the relation between the first and second conditions is not satisfied, the first control valve 7 is controlled to be opened and the second control valve 8 is controlled to be closed, and the refrigerant directly flows to the return air port 12 of the compressor 1.
The first condition is as follows: t ishAnd TPSatisfies the following conditions: t isp-Th＞Tmax(ii) a And a second condition: in the cooling mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax1(ii) a And (3) carrying out a third condition: heating mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax2Wherein P ismax1＞Pmax2. It can be understood that T0、T1、Tmax、Pmax1And Pmax2Are all preset values with respect to T0、T1、Tmax、Pmax1And Pmax2The specific value of (A) can be adjusted according to actual needs.
Thereby, by detecting the outdoor ambient temperature TRing (C)Exhaust temperature T of compressor 1PAnd the suction temperature T of the compressor 1hWhether the superheat degree needs to be improved or not is judged, and when the suction superheat degree of the compressor 1 needs to be improved, the refrigerant is heated by using the heat drawn from the heating device 6, so that the suction superheat degree of the compressor 1 is increased, efficient and reliable operation of the air conditioner 100 is guaranteed, and meanwhile, the control is simple, and the production cost is reduced.
The control method of the air conditioner 100 according to the embodiment of the present invention detects the outdoor ambient temperature TRing (C)Exhaust temperature T of compressor 1PAnd the suction temperature T of the compressor 1hWhether the superheat degree needs to be improved or not is judged, and when the suction superheat degree of the compressor 1 needs to be improved, the refrigerant is heated by using the heat drawn from the heating device 6, so that the suction superheat degree of the compressor 1 is increased, efficient and reliable operation of the air conditioner 100 is guaranteed, and meanwhile, the control is simple, and the production cost is reduced.
In some examples, referring to fig. 3, the control method of the air conditioner 100 includes the steps of:
s1: determining a current operation mode of the air conditioner 100;
s2: detecting the outdoor ambient temperature T when the air conditioner 100 is in the heating modeRing (C)For example, as shown in fig. 1, a third temperature detection device 103 may be provided outdoors to detect the outdoor ambient temperature TRing (C)At TRing (C)Satisfies the following conditions: t isRing (C)＜T0Then, step S3 is performed, wherein at TRing (C)Satisfies the following conditions: t isRing (C)≥T0When the first control valve 7 is opened, the controller controls the second control valve 8 to be closed;
detecting the outdoor ambient temperature T when the air conditioner 100 is in the cooling modeRing (C)At TRing (C)Satisfies the following conditions: t isRing (C)＞T1Then, step S3 is executed, wherein T1＞T0In addition, at TRing (C)Satisfies the following conditions: t isRing (C)＜T1When the first control valve 7 is opened, the controller controls the second control valve 8 to be closed;
s3: detecting the discharge temperature T of the compressor 1PAnd the return air temperature ThJudging T in heating modePAnd ThWhen at least one of the first condition and the third condition is satisfied, the first control valve 7 is controlled to be closed and the second control valve 8 is controlled to be opened, and the refrigeration mode judgment TPAnd ThWhen at least one of the conditions one and two is satisfied, the first control valve 7 is controlled to be closed and the second control valve 8 is controlled to be opened, and the condition one: t ishAnd TPSatisfies the following conditions: t isp-Th＞Tmax(ii) a And a second condition: when the air conditioner 100 is in the cooling mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax1(ii) a And (3) carrying out a third condition: when the air conditioner 100 is in the heating mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax2Wherein P ismax1＞Pmax2. Thereby, by detecting the outdoor ambient temperature TRing (C)Exhaust temperature T of compressor 1PAnd the suction temperature T of the compressor 1hWhether the superheat degree needs to be improved or not is judged, and when the suction superheat degree of the compressor 1 needs to be improved, the refrigerant is heated by using the heat drawn from the heating device 6, so that the suction superheat degree of the compressor 1 is increased, efficient and reliable operation of the air conditioner 100 is guaranteed, and meanwhile, the control is simple, and the production cost is reduced.
It is understood that step S3 may be: detecting the discharge temperature T of the compressor 1PAnd the return air temperature ThWhen T ishAnd TPSatisfies the following conditions: t isp-Th＞TmaxWhen the first control valve 7 is closed, the controller controls the second control valve 8 to be opened;
orStep S3 is: detecting the discharge temperature T of the compressor 1PAnd the return air temperature ThWhen the air conditioner 100 is in the cooling mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax1Controlling the first control valve 7 to close and controlling the second control valve 8 to open; when the air conditioner 100 is in the heating mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax2Controlling the first control valve 7 to close and controlling the second control valve 8 to open;
alternatively, step S3 is: detecting the discharge temperature T of the compressor 1PAnd the return air temperature ThWhen the air conditioner 100 is in the cooling mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax1And ThAnd TPSimultaneously, the following requirements are met: t isp-Th＞TmaxControlling the first control valve 7 to close and controlling the second control valve 8 to open; when the air conditioner 100 is in the heating mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax2And ThAnd TPSimultaneously, the following requirements are met: t isp-Th＞TmaxThe controller controls the first control valve 7 to close and the second control valve 8 to open.
In other examples, the control method of the air conditioner 100 includes the steps of:
a1: determines the current operation mode of the air conditioner 100 while detecting the outdoor ambient temperature TRing (C)Detecting the discharge temperature T of the compressor 1PAnd the return air temperature Th；
A2: in the heating mode, at TRing (C)＜T0And TPAnd ThWhen the relation between the first control valve and the second control valve satisfies at least one of the first condition and the third condition, the first control valve 7 is controlled to be closed and the second control valve 8 is controlled to be opened, so that the refrigerant flows to the heating device 6 through the second control valve 8 and flows to the return air port 12 of the compressor 1 after being heated by the heating device 6 as shown in fig. 1, the suction superheat degree of the compressor 1 is improved, and in the heating mode, when T isRing (C)、TPAnd ThWhen the above condition is not satisfied, the first control valve is controlled7 is opened and the second control valve 8 is controlled to be closed, and the refrigerant directly flows to the return air port 12 of the compressor 1.
In the cooling mode, at TRing (C)＞T1And TPAnd ThWhen the relationship between the first and second conditions is at least one of the first and second conditions, the first control valve 7 is controlled to be closed and the second control valve 8 is controlled to be opened, so that the refrigerant flows to the heating device 6 through the second control valve 8 and flows to the return air port 12 of the compressor 1 after being heated by the heating device 6, as shown in fig. 2, thereby improving the suction superheat degree of the compressor 1. In the cooling mode, when TRing (C)、TPAnd ThWhen the conditions are not met, the first control valve 7 is controlled to be opened, the second control valve 8 is controlled to be closed, and the refrigerant directly flows to the return air port 12 of the compressor 1.
In some embodiments of the invention, T is shown with reference to FIG. 50Satisfies the following conditions: t is not less than 0 DEG C0At most 4 ℃. Therefore, when the suction superheat degree of the compressor 1 needs to be improved, the refrigerant can be heated by the heat drawn from the heating device 6, and efficient and reliable operation of the air conditioner 100 can be guaranteed. E.g. T0Can be 0.1 deg.C, 1 deg.C, 2 deg.C, 3 deg.C or 3.9 deg.C, with respect to T0The specific value of (a) may be adjusted and designed according to the specification and model of the air conditioner 100, and the invention is not limited thereto.
In some embodiments of the invention, T is shown with reference to FIG. 51Satisfies the following conditions: t is not less than 33 DEG C1Less than or equal to 36 ℃. Therefore, when the suction superheat degree of the compressor 1 needs to be improved, the refrigerant can be heated by the heat drawn from the heating device 6, and efficient and reliable operation of the air conditioner 100 can be guaranteed. E.g. T1Can be 33.5 deg.C, 34 deg.C, 34.5 deg.C, 35 deg.C, 35.5 deg.C or 35.9 deg.C, with respect to T1The specific value of (a) may be adjusted and designed according to the specification and model of the air conditioner 100, and the invention is not limited thereto.
In some embodiments of the invention, TmaxSatisfies the following conditions: t is more than or equal to 74 DEG CmaxLess than or equal to 80 ℃. This ensures that the refrigerant is heated by the heat extracted from the heating device 6 when the degree of superheat of the intake air of the compressor 1 needs to be improvedWhich is beneficial to ensuring the high-efficiency and reliable operation of the air conditioner 100. E.g. TmaxCan be 74.5 deg.C, 75 deg.C, 76 deg.C, 77 deg.C, 78 deg.C, 79 deg.C or 79.9 deg.C, with respect to TmaxThe specific value of (a) may be adjusted and designed according to the specification and model of the air conditioner 100, and the invention is not limited thereto.
In some embodiments of the invention, Pmax1Satisfies the following conditions: p is more than or equal to 8max1≤10，Pmax2Satisfies the following conditions: 2 is less than or equal to Pmax2Less than or equal to 5. Therefore, when the suction superheat degree of the compressor 1 needs to be improved, the refrigerant can be heated by the heat drawn from the heating device 6, and efficient and reliable operation of the air conditioner 100 can be guaranteed. For example, Pmax1Can be 8.1, 8.5, 9, 9.5 or 9.9, Pmax2May be 2.1, 2.5, 3, 3.5, 4, 4.5 or 4.9 with respect to Pmax1And Pmax2The specific value of (a) may be adjusted and designed according to the specification and model of the air conditioner 100, and the invention is not limited thereto.
The air conditioner 100 and the control method of the air conditioner 100 according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood, of course, that the following description is intended to illustrate the invention and not to limit the invention.
As shown in fig. 1 and 2, an air conditioner 100 according to an embodiment of the present invention may include a compressor 1, a reversing assembly 2, a first control valve 7, a second control valve 8, an indoor heat exchanger 3, an outdoor heat exchanger 4, a throttling element 5, a heating device 6, a first temperature detecting device 101, a second temperature detecting device 102, and a controller, specifically, the heating device 6 is a regenerative heat exchanger, the reversing assembly 2 is a four-way valve, and the first temperature detecting device 101 and the second temperature detecting device 102 are temperature sensors, respectively.
As shown in fig. 1, the compressor 1 has a return port 12 and an exhaust port 11, and a refrigerant can be introduced into the compressor 1 through the return port 12, and a high-temperature and high-pressure refrigerant compressed by the compressor 1 can be discharged through the exhaust port 11.
As shown in fig. 1, the reversing assembly 2 includes an exhaust port 21, a return port 22, an indoor port 23 and an outdoor port 24, the exhaust port 21 is in switching communication with one of the indoor port 23 and the outdoor port 24, the return port 22 is in switching communication with the other of the indoor port 23 and the outdoor port 24, the exhaust port 21 is connected to the exhaust port 11, and the direction of refrigerant flow can be changed by operating the reversing assembly 2, so that the air conditioner 100 can be switched between a cooling function and a heating function.
As shown in fig. 1, a first end of the indoor heat exchanger 3 is connected to the indoor interface 23, a first end of the outdoor heat exchanger 4 is connected to the outdoor interface 24, and a throttling element 5 is connected in series between a second end of the outdoor heat exchanger 4 and a second end of the indoor heat exchanger 3. The indoor air may exchange heat with the indoor heat exchanger 3 to adjust the temperature of the indoor environment.
As shown in fig. 1, a first end of the first control valve 7 and a first end of the second control valve 8 are both connected to the return air port 22, and a second end of the first control valve 7 is connected to the return air port 12.
As shown in fig. 1, the heating device 6 is used for heating the refrigerant flowing through the heating device 6, the heating device 6 includes a refrigerant inlet 61 and a refrigerant outlet 62, the refrigerant inlet 61 is connected to the second end of the second control valve 8, and the refrigerant outlet 62 is connected to the return port 12.
As shown in fig. 1, the first temperature detecting means 101 is used for detecting the discharge temperature of the compressor 1, and the second temperature detecting means 102 is used for detecting the return air temperature of the compressor 1.
As shown in fig. 1, the controller is electrically connected to the first temperature detecting device 101, the second temperature detecting device 102, the first control valve 7 and the second control valve 8, respectively, to control the on/off of the first control valve 7 and the on/off of the second control valve 8 according to the detection results of the first temperature detecting device 101 and the second temperature detecting device 102.
Specifically, as shown in fig. 2, when the air conditioner 100 is in the cooling mode, the high-temperature and high-pressure refrigerant compressed by the compressor 1 is discharged from the discharge port 11 and flows to the discharge port 21, then flows to the outdoor heat exchanger 4 through the outdoor port 24, then flows to the indoor heat exchanger 3 through the throttling element 5, and then sequentially flows through the indoor port 23 and the return port 22;
if the controller determines that the suction superheat degree of the compressor 1 needs to be increased according to the detection results of the first temperature detection device 101 and the second temperature detection device 102, the controller controls the first control valve 7 to be closed and controls the second control valve 8 to be opened, so that the refrigerant flowing out of the return air interface 22 flows to the heating device 6 through the second control valve 8, is heated by the heating device 6, and then flows to the return air port 12 of the compressor 1, and the refrigeration cycle is completed. Therefore, the suction superheat degree of the compressor 1 can be improved, the efficient and reliable operation of the air conditioner 100 can be guaranteed, and meanwhile, the control is simple, and the production cost can be reduced;
if the controller determines that the suction superheat degree of the compressor 1 does not need to be increased according to the detection results of the first temperature detection device 101 and the second temperature detection device 102, the controller controls the first control valve 7 to be opened and controls the second control valve 8 to be closed, so that the refrigerant flowing out of the return air interface 22 directly flows to the return air port 12 of the compressor 1 after passing through the first control valve 7, and the refrigeration cycle is completed.
As shown in fig. 1, when the air conditioner 100 is in the heating mode, the high-temperature and high-pressure refrigerant compressed by the compressor 1 is discharged from the discharge port 11 and flows to the discharge port 21, then flows to the indoor heat exchanger 3 through the indoor port 23, then flows to the outdoor heat exchanger 4 through the throttling element 5, and then sequentially flows through the outdoor port 24 and the return port 22;
if the controller determines that the suction superheat degree of the compressor 1 needs to be increased according to the detection results of the first temperature detection device 101 and the second temperature detection device 102, the controller controls the first control valve 7 to be closed and controls the second control valve 8 to be opened, so that the refrigerant flowing out of the return air interface 22 flows to the heating device 6 through the second control valve 8, is heated by the heating device 6 and flows to the return air port 12 of the compressor 1, and the heating cycle is completed. Therefore, the suction superheat degree of the compressor 1 can be improved, the efficient and reliable operation of the air conditioner 100 can be guaranteed, and meanwhile, the control is simple, and the production cost can be reduced;
if the controller determines that the suction superheat degree of the compressor 1 does not need to be increased according to the detection results of the first temperature detection device 101 and the second temperature detection device 102, as shown in fig. 3, the controller controls the first control valve 7 to be opened and the second control valve 8 to be closed, and the refrigerant flowing out of the return air interface 22 directly flows to the return air port 12 of the compressor 1 after passing through the first control valve 7, thereby completing the refrigeration cycle.
The first embodiment;
as shown in fig. 4, the control method of the air conditioner 100 according to the embodiment of the present invention includes the steps of:
s1: determining a current operation mode of the air conditioner 100;
s2: detecting the outdoor ambient temperature T when the air conditioner 100 is in the heating modeRing (C)At TRing (C)Satisfies the following conditions: t isRing (C)＜T0Then, step S3 is executed. Wherein, when TRing (C)Satisfies the following conditions: t isRing (C)≥T0When the refrigerant flows into the first control valve 7, the controller controls the first control valve 7 to be opened and controls the second control valve 8 to be closed, the refrigerant flowing out of the air return interface 22 directly flows to the air return port 12 of the compressor 1 after passing through the first control valve 7, and at the moment, the refrigerant flowing to the air return port 12 of the compressor 1 is not overheated;
detecting the outdoor ambient temperature T when the air conditioner 100 is in the cooling modeRing (C)At TRing (C)Satisfies the following conditions: t isRing (C)＞T1Then, step S3 is executed. Wherein, when TRing (C)Satisfies the following conditions: t isRing (C)≤T1When the refrigerant flows into the first control valve 7, the controller controls the first control valve 7 to be opened and controls the second control valve 8 to be closed, the refrigerant flowing out of the air return interface 22 directly flows to the air return port 12 of the compressor 1 after passing through the first control valve 7, and at the moment, the refrigerant flowing to the air return port 12 of the compressor 1 is not overheated;
s3: detecting the discharge temperature T of the compressor 1PAnd the return air temperature ThWhen T ishAnd TPSatisfies the following conditions: t isp-Th＞TmaxWhen the compressor is started, the controller controls the first control valve 7 to be closed and controls the second control valve 8 to be opened, the refrigerant flowing out of the air return interface 22 flows to the heating device 6 through the second control valve 8, and flows to the air return port 12 of the compressor 1 after being heated by the heating device 6, so that the suction superheat degree of the compressor 1 can be improved. In addition, when T ishAnd TPSatisfies the following conditions: t isp-Th≤TmaxWhen the refrigerant flows into the compressor, the controller controls the first control valve 7 to be opened and controls the second control valve 8 to be closed, and the refrigerant flowing out of the air return interface 22 directly flows to the compressor after passing through the first control valve 71, the refrigerant flowing to the return port 12 of the compressor 1 is not superheated at this time.
Example two;
as shown in fig. 5, the control method of the air conditioner 100 according to the embodiment of the present invention includes the steps of:
s1: determining a current operation mode of the air conditioner 100;
s2: detecting the outdoor ambient temperature T when the air conditioner 100 is in the heating modeRing (C)At TRing (C)Satisfies the following conditions: t isRing (C)＜T0Then, step S3 is executed. Wherein, when TRing (C)Satisfies the following conditions: t isRing (C)≥T0When the refrigerant flows into the first control valve 7, the controller controls the first control valve 7 to be opened and controls the second control valve 8 to be closed, the refrigerant flowing out of the air return interface 22 directly flows to the air return port 12 of the compressor 1 after passing through the first control valve 7, and at the moment, the refrigerant flowing to the air return port 12 of the compressor 1 is not overheated;
detecting the outdoor ambient temperature T when the air conditioner 100 is in the cooling modeRing (C)At TRing (C)Satisfies the following conditions: t isRing (C)＞T1Then, step S3 is executed. Wherein, at TRing (C)Satisfies the following conditions: t isRing (C)≤T1When the refrigerant flows into the first control valve 7, the controller controls the first control valve 7 to be opened and controls the second control valve 8 to be closed, the refrigerant flowing out of the air return interface 22 directly flows to the air return port 12 of the compressor 1 after passing through the first control valve 7, and at the moment, the refrigerant flowing to the air return port 12 of the compressor 1 is not overheated;
s3: detecting the discharge temperature T of the compressor 1PAnd the return air temperature ThWhen the air conditioner 100 is in the cooling mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax1The first control valve 7 is controlled to be closed and the second control valve 8 is controlled to be opened, at this time, the refrigerant flowing out of the air return interface 22 flows to the heating device 6 through the second control valve 8, and flows to the air return port 12 of the compressor 1 after being heated by the heating device 6, so that the suction superheat degree of the compressor 1 can be improved, and in addition, when T is reachedhAnd TPSatisfies the following conditions: i Tp/Th|＜Pmax1The first control valve 7 is controlled to be opened and the second control valve 8 is controlled to be closed, and the refrigerant flowing out of the air return interface 22 passes through the first control valveThe refrigerant directly flows to the return air port 12 of the compressor 1 after the control valve 7, and the refrigerant flowing to the return air port 12 of the compressor 1 is not overheated at the moment;
when the air conditioner 100 is in the heating mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax2The first control valve 7 is controlled to be closed and the second control valve 8 is controlled to be opened, at this time, the refrigerant flowing out of the air return interface 22 flows to the heating device 6 through the second control valve 8, and flows to the air return port 12 of the compressor 1 after being heated by the heating device 6, so that the suction superheat degree of the compressor 1 can be improved, and in addition, when T is reachedhAnd TPSatisfies the following conditions: i Tp/Th|≤Pmax2The first control valve 7 is controlled to be opened and the second control valve 8 is controlled to be closed, the refrigerant flowing out of the air return interface 22 directly flows to the air return port 12 of the compressor 1 after passing through the first control valve 7, and at the moment, the refrigerant flowing to the air return port 12 of the compressor 1 is not overheated.
Other configurations and operations of the air conditioner 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. An air conditioner, comprising:
a compressor having a return air port and an exhaust port;
the reversing assembly comprises an exhaust interface, an air return interface, an indoor interface and an outdoor interface, and the exhaust interface is connected with the exhaust port;
the first end of the indoor heat exchanger is connected with the indoor interface;
the first end of the outdoor heat exchanger is connected with the outdoor interface, and a throttling element is connected in series between the second end of the outdoor heat exchanger and the second end of the indoor heat exchanger;
the first end of the first control valve and the first end of the second control valve are both connected with the air return interface, and the second end of the first control valve is connected with the air return port;
the heating device is used for heating the refrigerant flowing through the heating device, and comprises a refrigerant inlet and a refrigerant outlet, the refrigerant inlet is connected with the second end of the second control valve, and the refrigerant outlet is connected with the air return port;
the temperature control device comprises a first temperature detection device and a second temperature detection device, wherein the first temperature detection device is used for detecting the exhaust temperature of the compressor, and the second temperature detection device is used for detecting the return air temperature of the compressor;
a controller electrically connected to the first temperature detection device, the second temperature detection device, the first control valve, and the second control valve, respectively, to control on/off of the first control valve and on/off of the second control valve according to detection results of the first temperature detection device and the second temperature detection device, the controller being configured to:
judging the current operation mode of the air conditioner, and detecting the outdoor ambient temperature TRing (C)Detecting the discharge temperature T of the compressorPAnd the return air temperature Th；
In the heating mode, at TRing (C)＜T0And TPAnd ThWhen the relation between the first control valve and the second control valve meets at least one of the first condition and the third condition, controlling the first control valve to be closed and controlling the second control valve to be opened;
in the cooling mode, at TRing (C)＞T1And TPAnd ThWhen the relation between the first control valve and the second control valve meets at least one of the first condition and the second condition, the first control valve is controlled to be closed and the second control valve is controlled to be opened, wherein T1＞T0；
The first condition is as follows: t ishAnd TPSatisfies the following conditions: t isp-Th＞Tmax；
And a second condition: in the cooling mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax1；
And (3) carrying out a third condition: heating mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax2Wherein P ismax1＞Pmax2。
2. The air conditioner according to claim 1, wherein the heating means is a regenerative heat exchanger, and the heating means is provided outside a casing of the compressor to exchange heat with the compressor.
3. The air conditioner according to claim 1, wherein at least one of the first temperature detecting means and the second temperature detecting means is a temperature sensor.
4. The air conditioner according to claim 1, wherein at least one of the first control valve and the second control valve is a solenoid valve.
5. The air conditioner of claim 1, wherein the reversing component is a four-way valve.
6. A control method of an air conditioner according to any one of claims 1 to 5, characterized by comprising the steps of:
judging the current operation mode of the air conditioner, and detecting the outdoor ambient temperature TRing (C)Detecting the discharge temperature T of the compressorPAnd the return air temperature Th；
In the heating mode, at TRing (C)＜T0And TPAnd ThWhen the relation between the first control valve and the second control valve meets at least one of the first condition and the third condition, controlling the first control valve to be closed and controlling the second control valve to be opened;
in the cooling mode, at TRing (C)＞T1And TPAnd ThWhen the relation between the first control valve and the second control valve meets at least one of the first condition and the second condition, the first control valve is controlled to be closed and the second control valve is controlled to be opened, wherein T1＞T0；
The first condition is as follows: t ishAnd TPSatisfies the following conditions: t isp-Th＞Tmax；
And a second condition: in the cooling mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax1；
And (3) carrying out a third condition: heating mode, ThAnd TPSatisfies the following conditions: i Tp/Th|＞Pmax2Wherein P ismax1＞Pmax2。
7. The control method of an air conditioner according to claim 6, wherein the T is0Satisfies the following conditions: t is not less than 0 DEG C0≤4℃。
8. The control method of an air conditioner according to claim 6, wherein the T is1Satisfies the following conditions: t is not less than 33 DEG C1≤36℃。
9. The control method of an air conditioner according to claim 6, wherein the T ismaxSatisfies the following conditions: t is more than or equal to 74 DEG Cmax≤80℃。
10. According to the rightThe method of claim 6, wherein P is selected from the group consisting ofmax1Satisfies the following conditions: p is more than or equal to 8max1Less than or equal to 10, said Pmax2Satisfies the following conditions: 2 is less than or equal to Pmax2≤5。
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CN106247573A (en) * 2016-09-27 2016-12-21 广东美的暖通设备有限公司 Air-conditioner and compressor thereof return liquid determination methods and device

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CN106247573A (en) * 2016-09-27 2016-12-21 广东美的暖通设备有限公司 Air-conditioner and compressor thereof return liquid determination methods and device

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