CN109386982B - Air conditioner and control method thereof - Google Patents

Air conditioner and control method thereof Download PDF

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Publication number
CN109386982B
CN109386982B CN201811134141.7A CN201811134141A CN109386982B CN 109386982 B CN109386982 B CN 109386982B CN 201811134141 A CN201811134141 A CN 201811134141A CN 109386982 B CN109386982 B CN 109386982B
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air conditioner
control valve
heat exchanger
controlling
valve
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CN109386982A (en
Inventor
董明珠
谭建明
夏光辉
梁博
陈姣
冯青龙
何振健
秦晓柯
刘雷明
林金煌
邹云辉
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Gree Electric Appliances Inc of Zhuhai
Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides an air conditioner and a control method thereof. The air conditioner comprises a compressor (1), an indoor heat exchanger (2), a throttling device (3), a first bypass pipeline (4) and an outdoor heat exchanger (5), wherein the throttling device (3) is arranged on a pipeline between the indoor heat exchanger (2) and the outdoor heat exchanger (5), the first end of the first bypass pipeline (4) is connected to the outdoor heat exchanger (5) and used for conveying a high-temperature refrigerant to the outdoor heat exchanger (5), and a first control valve (6) for controlling the first bypass pipeline (4) to be switched on and off is arranged on the first bypass pipeline (4). According to the air conditioner provided by the invention, the defrosting period of the air conditioner can be prolonged, the defrosting time of the air conditioner is shortened, and the indoor comfort is improved.

Description

Air conditioner and control method thereof
Technical Field
The invention belongs to the technical field of air conditioning, and particularly relates to an air conditioner and a control method thereof.
Background
When the heat pump air conditioner heats at low temperature, the influence of frosting and defrosting can cause the problems of large indoor temperature fluctuation and poor comfort. Therefore, various means are adopted in the prior art to reduce the influence of defrosting on the indoor temperature.
In the chinese invention patent with application number 201210311278.1, an air conditioner is disclosed, in which an indoor heat exchanger is divided into two parts (a first indoor heat exchanger and a second indoor heat exchanger), and when defrosting is required on the outdoor side, the four-way valve performs reversing defrosting. After passing through the outdoor heat exchanger, the high-temperature refrigerant firstly flows through the second indoor heat exchanger, then flows through the expansion valve and then flows through the first indoor heat exchanger, so that heat is provided for the indoor side while defrosting is carried out.
This kind of mode, the heat transfer area (indoor side) of evaporimeter when having reduced the defrosting in other words, because indoor heat exchanger partly has acted as the condenser, supplies indoor heat, then supplies with outdoor heat exchanger's defrosting heat will be not enough, can lead to that the defrosting time is long, and the defrosting is not clean.
Disclosure of Invention
Therefore, an object of the present invention is to provide an air conditioner and a control method thereof, which can prolong a defrosting cycle of the air conditioner, shorten a defrosting time of the air conditioner, and improve indoor comfort.
In order to solve the above problems, the present invention provides an air conditioner, which includes a compressor, an indoor heat exchanger, a throttling device, a first bypass pipeline and an outdoor heat exchanger, wherein the throttling device is disposed on a pipeline between the indoor heat exchanger and the outdoor heat exchanger, a first end of the first bypass pipeline is connected to the outdoor heat exchanger and is used for conveying a high temperature refrigerant to the outdoor heat exchanger, and a first control valve for controlling the on-off of the first bypass pipeline is disposed on the first bypass pipeline.
Preferably, the air conditioner further comprises a gas-liquid separator disposed at a gas return end of the compressor.
Preferably, the air conditioner further comprises a four-way valve, and four interfaces of the four-way valve are respectively connected to the indoor heat exchanger, the outdoor heat exchanger, and the exhaust end and the air return end of the compressor.
Preferably, the outdoor heat exchanger includes the multirow heat exchange tube, and the multirow heat exchange tube includes the outer calandria that is close to the air inlet side and keeps away from the interior calandria of air inlet side, and the multirow heat exchange tube divide into the nest of tubes that the multiunit set up in parallel, lies in the interior calandria of same nest of tubes and arranges the calandria and pass through the connecting pipe series connection outward, and first bypass circuit is connected to the.
Preferably, the second end of the first bypass line is connected to one end of the indoor heat exchanger close to the throttling device.
Preferably, the air conditioner further comprises a second bypass pipeline, a first end of the second bypass pipeline is connected to the outdoor heat exchanger, a second end of the second bypass pipeline is connected to one end, close to the throttling device, of the indoor heat exchanger, and a second control valve for controlling the second bypass pipeline to be switched on and off is arranged on the second bypass pipeline.
Preferably, the second end of the first bypass line is connected to an end of the indoor heat exchanger remote from the throttling device.
Preferably, the air conditioner further comprises a second bypass pipeline, a first end of the second bypass pipeline is connected to the outdoor heat exchanger, a second end of the second bypass pipeline is connected to one end, away from the throttling device, of the indoor heat exchanger, and a second control valve for controlling the second bypass pipeline to be switched on and off is arranged on the second bypass pipeline.
Preferably, the first end of the first bypass pipeline is provided with a plurality of branches, and the branches are connected with the connecting pipes in a one-to-one correspondence manner.
Preferably, the outdoor heat exchanger further comprises a supercooling pipe, and the throttling device is connected with the pipe group through the supercooling pipe.
Preferably, the first control valve and the second control valve are solenoid valves, and the throttling device is an electronic expansion valve.
According to another aspect of the present invention, there is provided a control method of the air conditioner described above, including:
acquiring the current running state of the air conditioner;
the first control valve is controlled according to a current operation state of the air conditioner.
Preferably, the step of acquiring the current operation state of the air conditioner includes:
acquiring the operating condition of the air conditioner, and when the air conditioner is in a heating condition,
obtaining outdoor ambient temperature TOuter ring；
Obtaining the temperature T of the intermediate coil of the outdoor heat exchangerOuter tube。
Preferably, the step of controlling the first control valve by the current operation state of the air conditioner includes:
if T is detectedOuter ring≤TaAnd T is detected for a time T1Outer tube≤Tb，
Controlling the electronic expansion valve to keep the current state;
the first control valve is controlled to be connected for time t2, then the first control valve is controlled to be disconnected for time t3, and the steps are repeatedly executed.
Preferably, when the air conditioner further includes a second bypass line, the step of controlling the first control valve by the current operation state of the air conditioner includes:
if T is detectedOuter ring≤TaAnd T is detected for a time T1Outer tube≤Tb，
Controlling the electronic expansion valve to keep the current state;
the first control valve and the second control valve are controlled to be simultaneously connected for t2 time, then the first control valve and the second control valve are controlled to be simultaneously disconnected for t3 time, and the steps are repeatedly executed.
Preferably, when the air conditioner further includes a second bypass line, the step of controlling the first control valve by the current operation state of the air conditioner includes:
if T is detectedOuter ring≤TaAnd T is detected for a time T1Outer tube≤Tb；
Controlling the second control valve to keep disconnected;
and controlling the first control valve to be connected for t2 time, controlling the electronic expansion valve to be opened to the maximum opening degree, then controlling the first control valve to be disconnected for t3 time, controlling the electronic expansion valve to be opened to the original opening degree, and repeatedly executing the steps.
Preferably, the control method further includes:
and when the condition that the air conditioner reaches the defrosting condition is detected, defrosting control is carried out on the air conditioner.
Preferably, the step of acquiring the current operation state of the air conditioner includes:
acquiring the operation condition of the air conditioner, and when the air conditioner is in a defrosting operation state;
the controlling the first control valve by the current operation state of the air conditioner includes:
and controlling the first control valve to be communicated and controlling the opening of the electronic expansion valve to be maximum.
Preferably, the control method further includes:
and when defrosting is finished, controlling the first control valve to be disconnected, and controlling the opening degree of the electronic expansion valve to be opened to the initial opening degree.
Preferably, when the air conditioner further includes a second bypass line, the step of acquiring the current operation state of the air conditioner includes:
acquiring the operation condition of the air conditioner, and when the air conditioner is in a defrosting operation state;
the controlling the first control valve by the current operation state of the air conditioner includes:
and controlling the first control valve and the second control valve to be communicated simultaneously, and controlling the opening degree of the electronic expansion valve to be minimum.
Preferably, the control method further includes:
and when defrosting is finished, controlling the first control valve and the second control valve to be disconnected simultaneously, and controlling the opening degree of the electronic expansion valve to be opened to the initial opening degree.
Preferably, TaThe value range is 0-5 ℃, TbThe value range is-15-0 ℃, the value range of t1 is 0-5 min, the value range of t2 is 0-30 min, and the value range of t3 is 0-30 s.
The invention provides an air conditioner which comprises a compressor, an indoor heat exchanger, a throttling device, a first bypass pipeline and an outdoor heat exchanger, wherein the throttling device is arranged on a pipeline between the indoor heat exchanger and the outdoor heat exchanger, the first end of the first bypass pipeline is connected to the outdoor heat exchanger and used for conveying a high-temperature refrigerant to the outdoor heat exchanger, and a first control valve for controlling the on-off of the first bypass pipeline is arranged on the first bypass pipeline. This air conditioner can carry the high temperature refrigerant to outdoor heat exchanger through first bypass circuit of first control valve control under the operating mode is heated to low temperature, can disturb outdoor heat exchanger's the condition of frosting, when guaranteeing normal heat supply, the cycle of the defrosting of extension frosting, and can shorten the time of defrosting, promote the travelling comfort that the low temperature heated.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioner according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an air conditioner according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of an air conditioner according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of an air conditioner according to a fourth embodiment of the present invention;
FIG. 5 is a control schematic diagram of an air conditioner according to an embodiment of the present invention;
fig. 6 is a flowchart of a control method of an air conditioner according to a first embodiment of the present invention;
fig. 7 is a flowchart of a control method of an air conditioner according to a second embodiment of the present invention;
fig. 8 is a flowchart illustrating a defrosting control of an air conditioner according to an embodiment of the present invention.
The reference numerals are represented as:
1. a compressor; 2. an indoor heat exchanger; 3. a throttling device; 4. a first bypass line; 5. an outdoor heat exchanger; 6. a first control valve; 7. a gas-liquid separator; 8. a four-way valve; 9. an inner calandria; 10. an outer discharge pipe; 11. a connecting pipe; 12. a second bypass line; 13. a second control valve; 14. branching; 15. and a supercooling pipe.
Detailed Description
The direction of the arrows in the figure is the air flow direction.
Referring to fig. 1 to 4 in combination, according to an embodiment of the present invention, the air conditioner includes a compressor 1, an indoor heat exchanger 2, a throttling device 3, a first bypass line 4 and an outdoor heat exchanger 5, the throttling device 3 is disposed on a line between the indoor heat exchanger 2 and the outdoor heat exchanger 5, a first end of the first bypass line 4 is connected to the outdoor heat exchanger 5 and is used for conveying a high-temperature refrigerant to the outdoor heat exchanger 5, and a first control valve 6 for controlling on and off of the first bypass line 4 is disposed on the first bypass line 4.
This air conditioner can carry the high temperature refrigerant to outdoor heat exchanger 5 through first bypass pipeline 4 of first control valve 6 control under the operating mode of heating at low temperature, can disturb outdoor heat exchanger 5's frosting condition, when guaranteeing normal heat supply, the cycle of extension frosting defrosting, and can shorten the time of defrosting, promote the travelling comfort that the low temperature heated. The high-temperature refrigerant herein refers to a refrigerant having a temperature higher than that of a refrigerant in the exterior heat exchanger 5 in a heating condition with respect to the exterior heat exchanger 5, and in the present embodiment, the high-temperature refrigerant flows out from an exhaust port of the compressor 1 or an outlet end of the interior heat exchanger 2.
After adopting the air conditioner of this application, for traditional air conditioner, the defrosting cycle that frosts can prolong 3 times, and the defrosting time can shorten 5%, makes indoor travelling comfort obtain promoting by a wide margin.
The first control valve 6 is used for controlling the on-off of the first bypass pipeline 4, so that part of high-temperature refrigerant can be directly led to the outdoor heat exchanger 5 periodically or irregularly, the pipe temperature of the outdoor heat exchanger is increased, and the frosting temperature condition is disturbed.
The air conditioner also comprises a gas-liquid separator 7, and the gas-liquid separator 7 is arranged at the gas return end of the compressor 1. When the first bypass pipeline 4 is controlled to be communicated through the first control valve 6, the high-temperature refrigerant can directly enter the outdoor heat exchanger 5 without throttling, the outdoor heat exchanger is defrosted, more liquid refrigerants possibly exist in the defrosted refrigerant, and the gas-liquid separator 7 is arranged to separate gas and liquid of the refrigerant flowing back to the compressor 1, so that the liquid refrigerant is prevented from entering the gas return end of the compressor and causing liquid impact.
The air conditioner also comprises a four-way valve 8, and four interfaces of the four-way valve 8 are respectively connected to the indoor heat exchanger 2, the outdoor heat exchanger 5 and the exhaust end and the air return end of the compressor 1.
The outdoor heat exchanger 5 comprises a plurality of rows of heat exchange tubes, each row of heat exchange tubes comprises an outer row of tubes 10 close to the air inlet side and an inner row of tubes 9 far away from the air inlet side, each row of heat exchange tubes is divided into a plurality of groups of tube groups which are arranged in parallel, the inner row of tubes 9 and the outer row of tubes 10 which are positioned on the same tube group are connected in series through connecting tubes 11, and the first bypass pipeline 4 is connected to the connecting tubes 11. In this embodiment, the outdoor heat exchanger 5 includes two rows of heat exchangers, one row of inner tubes 9 and one row of outer tubes 10, where the inner tubes 9 and the outer tubes 10 are equally divided into four tube groups, and each tube group includes the same or similar number of inner tubes 9 and outer tubes 10, so as to form four heat exchange tube groups connected in parallel. The first bypass pipeline 4 is connected to a connecting pipe 11 at the connecting position of the inner discharge pipe 9 and the outer discharge pipe 10, and when the first bypass pipeline 4 is communicated, a high-temperature refrigerant is respectively communicated to the inner discharge pipe 9 and the outer discharge pipe 10, so that the inner discharge pipe 9 and the outer discharge pipe 10 are defrosted simultaneously, the utilization efficiency of the high-temperature refrigerant is improved, and the purpose of shortening defrosting time is achieved.
The outdoor heat exchanger 5 further comprises a supercooling pipe 15, and the throttling device 3 is connected with the pipe group through the supercooling pipe 15. The supercooling pipe 15 can supercool the heat exchange pipe set, thereby improving the heat exchange efficiency of the outdoor heat exchanger 5.
The first control valve 6 and the second control valve 13 are solenoid valves, and the throttle device 3 is an electronic expansion valve.
Referring to fig. 1 in combination, according to the first embodiment of the present invention, the second end of the first bypass line 4 is connected to one end of the indoor heat exchanger 2 near the throttling device 3. In this embodiment, only one first bypass pipeline 4 and one first control valve 6 are added to the original system, wherein the first control valve 6 is connected in parallel with the throttling device 3, one end of the first control valve is connected with the indoor heat exchanger 2, the other end of the first control valve is divided into four branches 14, and the branches 14 are correspondingly connected with the corner connecting pipes 11 of the original branch through three-way pipes.
Referring to fig. 2 in combination, the second embodiment of the present invention is substantially the same as the first embodiment, except that in this embodiment, the air conditioner further includes a second bypass line 12, a first end of the second bypass line 12 is connected to the outdoor heat exchanger 5, a second end of the second bypass line 12 is connected to one end of the indoor heat exchanger 2 close to the throttling device 3, and a second control valve 13 for controlling on/off of the second bypass line 12 is disposed on the second bypass line 12. In the present embodiment, for convenience of description, the first control valve 6 is set as the solenoid valve a, and the second control valve 13 is set as the solenoid valve B.
In this embodiment, two electromagnetic valves and a shunt pipeline are additionally arranged on the original system. When the electromagnetic valve A and the electromagnetic valve B are both in a power-off state during heating operation, a refrigerant is compressed by the compressor 1 to do work, then flows through the indoor heat exchanger 2 for heat exchange through the exhaust port, then flows through the electronic expansion valve for throttling and cooling, then flows through the outdoor heat exchanger 5 for heat exchange, and finally is sucked by the air suction port of the compressor 1 to enter the next circulation flow. When the electromagnetic valve A and the electromagnetic valve B are both in a power-on state, the refrigerant is compressed by the compressor 1 to do work, and flows through the indoor heat exchanger 2 through the exhaust port to exchange heat, and then a part of the refrigerant passes through the electromagnetic valve A, and a part of the refrigerant with higher temperature is directly supplemented into the inner discharge pipe 9 through the shunt pipeline. A part of the refrigerant is shunted to an outer discharge pipe 10 of the outdoor heat exchanger 5 through an electromagnetic valve B and an electronic expansion valve. After heat exchange is completed at the outdoor heat exchanger 5, the refrigerant is sucked from the suction port by the compressor 1 and flows in the next cycle.
The electromagnetic valve A and the electromagnetic valve B are both connected with the electronic expansion valve in parallel, one end of the electromagnetic valve A is connected with one end of the indoor heat exchanger 2 close to the electronic expansion valve (at the outlet of the indoor heat exchanger 2 during heating), one end of the electromagnetic valve A is divided into four branches 14, and each branch 14 is connected with the turning position of the original branch through a three-way pipe. One end of the electromagnetic valve B is connected with one end of the indoor heat exchanger 2 (the outlet of the indoor heat exchanger during heating), one end of the electromagnetic valve B is divided into four paths, and the flow direction of the electromagnetic valve B is consistent with that of the refrigerant passing through the electronic expansion valve during power failure of the electromagnetic valve. The air conditioner is not limited to a single-stage compression heat pump system, but is also applicable to a two-stage compression heat pump system and a variable-capacity compression heat pump system. The flow path of the heat pump system is not limited to the flow path shown in fig. 2, and may be flexibly adjusted according to the performance of the heat pump air conditioner.
Referring to fig. 3 in combination, according to the third embodiment of the present invention, the second end of the first bypass line 4 is connected to the end of the indoor heat exchanger 2 away from the throttling device 3.
In this embodiment, only one first control valve 6 is added to the original system. The first control valve 6 is connected with the electronic expansion valve in parallel, one end of the first control valve 6 is connected with one end of the indoor heat exchanger 2 (when heating, the inlet of the indoor heat exchanger 2), one end is divided into four branches 14, and each branch 14 is connected with the turning position of the original branch through a three-way pipe.
Referring to fig. 4 in combination, the fourth embodiment of the present invention is substantially the same as the third embodiment, except that in this embodiment, the air conditioner further includes a second bypass line 12, a first end of the second bypass line 12 is connected to the outdoor heat exchanger 5, a second end of the second bypass line 12 is connected to an end of the indoor heat exchanger 2 away from the throttling device 3, and a second control valve 13 for controlling on/off of the second bypass line 12 is disposed on the second bypass line 12. In the present embodiment, for convenience of description, the first control valve 6 is set as the solenoid valve a, and the second control valve 13 is set as the solenoid valve B.
In this embodiment, the electromagnetic valve a and the electromagnetic valve B are both connected in parallel with the electronic expansion valve, one end of the electromagnetic valve a is connected to one end of the indoor heat exchanger 2 away from the electronic expansion valve (at the inlet of the indoor heat exchanger 2 during heating), and the other end is divided into four branches 14, and each branch 14 is connected to the elbow of the original branch through a three-way pipe. One end of the electromagnetic valve B is connected with one end of the indoor heat exchanger 2 (at the inlet of the indoor heat exchanger 2 during heating), and the other end of the electromagnetic valve B is divided into four paths, and the flow direction of the four paths is consistent with that of the refrigerant passing through the electronic expansion valve when the electromagnetic valve is powered off.
In an embodiment not shown in the drawings, it is substantially the same as the fourth embodiment, except that in this embodiment, the second end of the second bypass line 12 is connected to the end of the indoor heat exchanger near the throttling device 3.
Referring to fig. 5 to 8 in combination, according to an embodiment of the present invention, a control method of the air conditioner includes: acquiring the current running state of the air conditioner; the first control valve 6 is controlled according to the current operation state of the air conditioner.
The step of acquiring the current operation state of the air conditioner includes: acquiring the operation condition of the air conditioner, and acquiring the outdoor environment temperature T when the air conditioner is in the heating conditionOuter ring(ii) a Obtaining the temperature T of the intermediate coil of the outdoor heat exchanger 5Outer tube。
The step of controlling the first control valve 6 by the current operation state of the air conditioner includes: if T is detectedOuter ring≤TaAnd T is detected for a time T1Outer tube≤TbControlling the electronic expansion valve to keep the current state; the first control valve 6 is controlled to be connected for time t2, then the first control valve 6 is controlled to be disconnected for time t3, and the steps are repeatedly executed.
When the air conditioner further includes the second bypass line 12, the step of controlling the first control valve 6 by the current operation state of the air conditioner includes: if T is detectedOuter ring≤TaAnd T is detected for a time T1Outer tube≤TbControlling the electronic expansion valve to keep the current state; the first control valve 6 and the second control valve 13 are controlled to be simultaneously connected for a time t2, and then the first control valve 6 and the second control valve 13 are controlled to be simultaneously disconnected for a time t3, and the steps are repeatedly executed.
When the air conditioner further includes the second bypass line 12, the step of controlling the first control valve 6 by the current operation state of the air conditioner includes: if T is detectedOuter ring≤TaAnd T is detected for a time T1Outer tube≤Tb(ii) a Controlling the second control valve 13 to remain open; and controlling the first control valve 6 to be communicated for t2 time, controlling the electronic expansion valve to be opened to the maximum opening degree, then controlling the first control valve 6 to be disconnected for t3 time, controlling the electronic expansion valve to be opened to the original opening degree, and repeatedly executing the steps.
The control method further comprises the following steps: and when the condition that the air conditioner reaches the defrosting condition is detected, defrosting control is carried out on the air conditioner. The step of acquiring the current operation state of the air conditioner includes: acquiring the operation condition of the air conditioner, and when the air conditioner is in a defrosting operation state; the step of controlling the first control valve 6 by the current operation state of the air conditioner includes: and controlling the first control valve 6 to be communicated and controlling the opening of the electronic expansion valve to be maximum.
The control method further comprises the following steps: when defrosting is finished, the first control valve 6 is controlled to be disconnected, and the opening degree of the electronic expansion valve is controlled to be opened to the initial opening degree.
When the air conditioner further includes the second bypass line 12, the step of acquiring the current operation state of the air conditioner includes: acquiring the operation condition of the air conditioner, and when the air conditioner is in a defrosting operation state; the step of controlling the first control valve 6 by the current operation state of the air conditioner includes: and controlling the first control valve 6 and the second control valve 13 to be communicated simultaneously, and controlling the opening degree of the electronic expansion valve to be minimum.
The control method further comprises the following steps: when defrosting is finished, the first control valve 6 and the second control valve 13 are controlled to be disconnected simultaneously, and the opening degree of the electronic expansion valve is controlled to be opened to the initial opening degree.
TaThe value range is 0-5 ℃, TbThe value range is-15-0 ℃, the value range of t1 is 0-5 min, the value range of t2 is 0-30 min, and the value range of t3 is 0-30 s.
Referring to fig. 1 and 3 in combination, when the air conditioners of the first and third embodiments are used, during heating operation, when the air conditioner is turned on, if the outdoor ambient temperature T is detectedOuter ring≤TaAnd T is detected for a time T1Outer tube≤TbAnd then the electromagnetic valve A is electrified for t2 time, then is powered off for t3 time, and then is powered on for t2 time, when the electromagnetic valve A is electrified, the electronic expansion valve is opened to the maximum, when the electromagnetic valve A is powered off, the electronic expansion valve is opened to the original opening, and the operation is repeated. The rest loads keep the original running state or the original control mode. And if the system is detected to reach the defrosting condition during the on-off control of the electromagnetic valve A, carrying out defrosting control.
When the air conditioner is detected to enter defrosting control, the electromagnetic valve A is controlled to be electrified, and the opening degree of the electronic expansion valve is opened to the maximum. After defrosting is finished, the electronic expansion valve is opened to the initial opening degree, and the electromagnetic valve A is powered off.
Referring to fig. 2, 4 and 6, if the outdoor environment temperature T is detected during the heating operation and the start-up of the air conditioner according to the second and fourth embodimentsOuter ring≤TaAnd T is detected for a time T1Outer tube≤TbThen solenoid A and solenoid B are energized simultaneously and continue for t2Then simultaneously powering off for t3 time, then simultaneously powering on for t2 time, and so on. The opening of the electronic expansion valve is controlled according to the original heating logic. The rest loads keep the original running state or the original control mode. And if the condition that the air conditioner enters the defrosting condition is detected during the on-off control of the electromagnetic valve, carrying out defrosting control.
When the electromagnetic valve A and the electromagnetic valve B are powered on, a part of high-temperature refrigerant flows through the outdoor heat exchanger 5 through the original flow path, and a part of high-temperature refrigerant flows through the residual heat exchange tubes after being converged with the flow of the original flow path through the three-way pipe, and the temperature of the refrigerant flowing through the heat exchange tubes is higher than that of the refrigerant when the electromagnetic valve A and the electromagnetic valve B are powered off. At this time, the intermediate temperature of the coil of the outdoor heat exchanger 5 can be properly raised, the frosting condition is disturbed, and the purposes of inhibiting frosting and delaying the frosting and defrosting period are achieved.
When the air conditioner is detected to enter defrosting control, the electromagnetic valve A and the electromagnetic valve B are electrified simultaneously, and the opening degree of the electronic expansion valve is opened to the minimum. After defrosting is finished, the electronic expansion valve is opened to the initial opening, and the electromagnetic valve A and the electromagnetic valve B are powered off simultaneously.
When the electromagnetic valve A and the electromagnetic valve B are electrified, the temperature of the refrigerant of the inner side flow path is higher than that of the original defrosting flow path, so that the defrosting of the outdoor heat exchanger 5 is more facilitated, the defrosting efficiency of the outdoor heat exchanger 5 is improved, and the defrosting time is shortened.
Referring to fig. 2, 4 and 7 in combination, in another embodiment, during heating operation, if the outdoor environment temperature T is detected during heating operationOuter ring≤TaAnd T is detected for a time T1Outer tube≤TbIf the electromagnetic valve A is electrified and lasts for t2 time, the electronic expansion valve is opened to the maximum opening; then the electromagnetic valve A is powered off and lasts for t3 time, and the electronic expansion valve is opened to the original opening; then the electromagnetic valve A is electrified and lasts for t2 time, and the electronic expansion valve is opened to the maximum opening; the operation is repeated in this way. The electromagnetic valve B is always in a power-off state. The rest loads keep the original running state or the original control mode. And if the system is detected to reach the defrosting condition during the on-off control of the electromagnetic valve, carrying out defrosting control.
When the air conditioner is detected to enter defrosting control, the electromagnetic valve A and the electromagnetic valve B are electrified simultaneously, and the opening degree of the electronic expansion valve is opened to the minimum. After defrosting is finished, the electronic expansion valve is opened to the initial opening, and the electromagnetic valve A and the electromagnetic valve B are powered off simultaneously.
When the electromagnetic valve A and the electromagnetic valve B are electrified, the temperature of the refrigerant of the inner side flow path is higher than that of the original defrosting flow path, so that the defrosting of the outdoor heat exchanger 5 is more facilitated, the defrosting efficiency of the outdoor heat exchanger 5 is improved, and the defrosting time is shortened.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (21)

1. An air conditioner is characterized by comprising a compressor (1), an indoor heat exchanger (2), a throttling device (3), a first bypass pipeline (4) and an outdoor heat exchanger (5), wherein the throttling device (3) is arranged on a pipeline between the indoor heat exchanger (2) and the outdoor heat exchanger (5), the first end of the first bypass pipeline (4) is connected to the outdoor heat exchanger (5) and used for conveying a high-temperature refrigerant to the outdoor heat exchanger (5), and a first control valve (6) for controlling the first bypass pipeline (4) to be switched on and off is arranged on the first bypass pipeline (4); outdoor heat exchanger (5) include the multirow heat exchange tube, the multirow heat exchange tube is including outer calandria (10) that are close to the air inlet side and keep away from interior calandria (9) of air inlet side, the multirow heat exchange tube divide into the parallelly connected nest of tubes that sets up of multiunit, is located same nest of tubes interior calandria (9) with outer calandria (10) establish ties through connecting pipe (11), first bypass pipeline (4) are connected to connecting pipe (11).
2. The air conditioner according to claim 1, further comprising a gas-liquid separator (7), wherein the gas-liquid separator (7) is disposed at a gas return end of the compressor (1).
3. The air conditioner according to claim 1, further comprising a four-way valve (8), wherein four ports of the four-way valve (8) are respectively connected to the indoor heat exchanger (2), the outdoor heat exchanger (5), and a discharge end and a return end of the compressor (1).
4. Air conditioner according to claim 1, characterized in that the second end of the first bypass line (4) is connected to the end of the indoor heat exchanger (2) close to the throttle device (3).
5. The air conditioner according to claim 4, characterized in that the air conditioner further comprises a second bypass pipeline (12), a first end of the second bypass pipeline (12) is connected to the outdoor heat exchanger (5), a second end of the second bypass pipeline (12) is connected to one end of the indoor heat exchanger (2) close to the throttling device (3), and a second control valve (13) for controlling the second bypass pipeline (12) to be opened and closed is arranged on the second bypass pipeline (12).
6. Air conditioner according to claim 1, characterized in that the second end of the first bypass line (4) is connected to the end of the indoor heat exchanger (2) remote from the throttling device (3).
7. The air conditioner according to claim 6, characterized in that the air conditioner further comprises a second bypass pipeline (12), a first end of the second bypass pipeline (12) is connected to the outdoor heat exchanger (5), a second end of the second bypass pipeline (12) is connected to one end of the indoor heat exchanger (2) far away from the throttling device (3), and a second control valve (13) for controlling the second bypass pipeline (12) to be opened and closed is arranged on the second bypass pipeline (12).
8. The air conditioner according to claim 1, wherein the first end of the first bypass line (4) is provided with a plurality of branches (14), and the branches (14) are connected with the connecting pipes (11) in a one-to-one correspondence.
9. The air conditioner according to claim 1, wherein the outdoor heat exchanger (5) further comprises a supercooling pipe (15), and the throttle device (3) is connected to the tube group through the supercooling pipe (15).
10. Air conditioner according to claim 5, characterized in that the first control valve (6) and the second control valve (13) are solenoid valves and the throttling device (3) is an electronic expansion valve.
11. A control method of an air conditioner according to any one of claims 1 to 10, comprising:
acquiring the current running state of the air conditioner;
the first control valve (6) is controlled according to the current operating state of the air conditioner.
12. The control method according to claim 11, wherein the step of acquiring the current operation state of the air conditioner includes:
acquiring the operating condition of the air conditioner, and when the air conditioner is in a heating condition,
obtaining outdoor ambient temperature TOuter ring；
Obtaining the temperature T of the intermediate coil of the outdoor heat exchanger (5)Outer tube。
13. The control method according to claim 12, wherein the step of controlling the first control valve (6) by the current operation state of the air conditioner includes:
if T is detectedOuter ring≤TaAnd T is detected for a time T1Outer tube≤Tb，
Controlling the electronic expansion valve to keep the current state;
the first control valve (6) is controlled to be connected for t2 time, then the first control valve (6) is controlled to be disconnected for t3 time, and the steps are repeatedly executed.
14. The control method according to claim 12, wherein when the air conditioner further includes the second bypass line (12), the step of controlling the first control valve (6) by the current operation state of the air conditioner includes:
if T is detectedOuter ring≤TaAnd T is detected for a time T1Outer tube≤Tb，
Controlling the electronic expansion valve to keep the current state;
the first control valve (6) and the second control valve (13) are controlled to be simultaneously connected for t2 time, then the first control valve (6) and the second control valve (13) are controlled to be simultaneously disconnected for t3 time, and the steps are repeatedly executed.
15. The control method according to claim 12, wherein when the air conditioner further includes the second bypass line (12), the step of controlling the first control valve (6) by the current operation state of the air conditioner includes:
if T is detectedOuter ring≤TaAnd T is detected for a time T1Outer tube≤Tb；
Controlling the second control valve (13) to remain open;
and controlling the first control valve (6) to be communicated for t2 time, controlling the electronic expansion valve to be opened to the maximum opening degree, then controlling the first control valve (6) to be disconnected for t3 time, controlling the electronic expansion valve to be opened to the original opening degree, and repeatedly executing the steps.
16. The control method according to any one of claims 13 to 15, characterized by further comprising:
and when the condition that the air conditioner reaches the defrosting condition is detected, defrosting control is carried out on the air conditioner.
17. The control method according to claim 11, wherein the step of acquiring the current operation state of the air conditioner includes:
acquiring the operation condition of the air conditioner, and when the air conditioner is in a defrosting operation state;
the step of controlling the first control valve (6) by the current operation state of the air conditioner includes:
and controlling the first control valve (6) to be communicated and controlling the opening of the electronic expansion valve to be maximum.
18. The control method according to claim 17, characterized by further comprising:
when defrosting is finished, the first control valve (6) is controlled to be disconnected, and the opening degree of the electronic expansion valve is controlled to be opened to the initial opening degree.
19. The control method according to claim 11, wherein when the air conditioner further includes a second bypass line (12), the step of acquiring the current operation state of the air conditioner includes:
acquiring the operation condition of the air conditioner, and when the air conditioner is in a defrosting operation state;
the step of controlling the first control valve (6) by the current operation state of the air conditioner includes:
and controlling the first control valve (6) and the second control valve (13) to be communicated simultaneously, and controlling the opening degree of the electronic expansion valve to be minimum.
20. The control method according to claim 19, characterized by further comprising:
when defrosting is finished, the first control valve (6) and the second control valve (13) are controlled to be disconnected simultaneously, and the opening degree of the electronic expansion valve is controlled to be opened to the initial opening degree.
21. Control method according to any of claims 13 to 15, characterized in that T is TaThe value range is 0-5 ℃, TbThe value range is-15-0 ℃, the value range of t1 is 0-5 min, the value range of t2 is 0-30 min, and the value range of t3 is 0-30 s.
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