CN107477930B - Air conditioning system, air conditioning device, control method and control device thereof - Google Patents
Air conditioning system, air conditioning device, control method and control device thereof Download PDFInfo
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- CN107477930B CN107477930B CN201710720348.1A CN201710720348A CN107477930B CN 107477930 B CN107477930 B CN 107477930B CN 201710720348 A CN201710720348 A CN 201710720348A CN 107477930 B CN107477930 B CN 107477930B
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- temperature
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- control element
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Classifications
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/05—Compression system with heat exchange between particular parts of the system
- F25B2400/051—Compression system with heat exchange between particular parts of the system between the accumulator and another part of the cycle
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses an air conditioning system, an air conditioning device, a control method and a control device thereof. The air conditioner comprises a compressor and a gas-liquid separator, wherein a heat exchange device is arranged on a pipeline of an outlet of the compressor, a liquid return port of the gas-liquid separator is connected with a first end of the heat exchange device, and a second end of the heat exchange device is connected with an inlet of the compressor. The invention can heat the liquid refrigerant led out of the gas-liquid separator by the high-temperature refrigerant on the exhaust side of the compressor through the heat exchange device to evaporate the liquid refrigerant into a gaseous state, so as to reduce the liquid refrigerant in the gas-liquid separator, reduce or reduce the refrigerant effusion and prevent the liquid return phenomenon, thereby improving the operation reliability of the compressor and prolonging the service life of the compressor.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning system, an air conditioning device, a control method and a control device thereof.
Background
At present, most air conditioner systems are in a low-temperature heating mode, and because of low outdoor working conditions, refrigerants are insufficient in heat exchange in a heat exchanger of an outdoor unit, and liquid refrigerants are stored in a gas-liquid separator. When the unit is in the low-temperature heating operation process for a long time, the liquid accumulation phenomenon is easy to occur in the gas-liquid separator, the liquid return of the system is easy to occur, the operation reliability and the normal operation of the compressor are affected, and the service life of the compressor is shortened.
Disclosure of Invention
The embodiment of the invention provides an air conditioning system, an air conditioning device, a control method and a control device thereof, which are used for solving the problems that in the prior art, in the long-time low-temperature heating operation process, liquid accumulation phenomenon is easy to occur in a gas-liquid separator, system liquid return is easy to cause, and the operation reliability and the service life of a compressor are influenced.
In order to achieve the above object, an embodiment of the present invention provides an air conditioner, including a compressor and a gas-liquid separator, wherein a heat exchange device is disposed on a pipeline of an outlet of the compressor, a liquid return port of the gas-liquid separator is connected with a first end of the heat exchange device, and a second end of the heat exchange device is connected with an inlet of the compressor.
Preferably, the liquid return port of the gas-liquid separator is connected with the first end of the heat exchange device through a liquid return control element.
Preferably, the liquid return control element comprises an electronic expansion valve.
Preferably, the liquid return control element comprises a capillary tube and a solenoid valve arranged in series.
Preferably, the liquid return port is formed in a side wall of the gas-liquid separator.
The invention also provides a control method of the air conditioner, which comprises the following steps: acquiring a first temperature at an inlet pipe of a gas-liquid separator of the air conditioner and a second temperature at an outlet pipe of the gas-liquid separator; and if |T1-T2| > T0, opening the liquid return control element, otherwise, closing the liquid return control element, wherein T1 is the first temperature, T2 is the second temperature, and T0 is the first preset temperature.
Preferably, the method further comprises: acquiring a third temperature at a connecting pipeline between a second end of a heat exchange device of the air conditioner and an inlet of the compressor; and controlling the opening degree of the liquid return control element according to the magnitude relation between the third temperature and the second preset temperature.
Preferably, controlling the opening degree of the liquid return control element according to the magnitude relation between the third temperature and the second predetermined temperature includes: if T3 is less than T, reducing the opening of the liquid return control element by a preset size every preset time; and/or if T3 > T, increasing the opening of the liquid return control element by a predetermined amount every predetermined time; and/or if t3=t, maintaining the opening degree of the liquid return control element unchanged; wherein T3 is the third temperature, and T is the second predetermined temperature.
Preferably, the liquid return control element adopts an electronic expansion valve.
Preferably, the opening degree of the electronic expansion valve is adjusted to be increased or decreased by a predetermined amount by operating the electronic expansion valve by a predetermined number of steps.
Preferably, the liquid return control element comprises a capillary tube and a solenoid valve arranged in series.
The invention also provides a control device of the air conditioner, which comprises: the first temperature acquisition module is used for acquiring a first temperature at an inlet pipe of a gas-liquid separator of the air conditioner and a second temperature at an outlet pipe of the gas-liquid separator; and the control module is used for opening the liquid return control element when the temperature is |T1-T2| > T0, and closing the liquid return control element when the temperature is not |T1-T2| > T0, wherein T1 is the first temperature, T2 is the second temperature, and T0 is the first preset temperature.
Preferably, the method further comprises: a second temperature acquisition module for acquiring a third temperature at a connecting pipeline between a second end of a heat exchange device of the air conditioner and an inlet of the compressor; and the control module controls the opening degree of the liquid return control element according to the magnitude relation between the third temperature and the second preset temperature.
Preferably, the control module includes: the first opening adjusting module is used for reducing the opening of the liquid return control element by a preset size every preset time when T3 is smaller than T; and/or a second opening adjusting module, which is used for increasing the opening of the liquid return control element by a preset size every preset time when T3 is more than T; and/or a third opening adjusting module, configured to keep the opening of the liquid return control element unchanged when t3=t; wherein T3 is the third temperature, and T is the second predetermined temperature.
The invention also provides an air conditioning system which comprises the control device.
The invention can heat the liquid refrigerant led out of the gas-liquid separator by the high-temperature refrigerant on the exhaust side of the compressor through the heat exchange device to evaporate the liquid refrigerant into a gaseous state, so as to reduce the liquid refrigerant in the gas-liquid separator, reduce or reduce the refrigerant effusion and prevent the liquid return phenomenon, thereby improving the operation reliability of the compressor and prolonging the service life of the compressor.
Drawings
FIG. 1 is a schematic view of a first embodiment of the present invention;
fig. 2 is a schematic structural view of a second embodiment of the present invention.
Reference numerals illustrate: 1. a compressor; 2. a gas-liquid separator; 3. a heat exchange device; 4. an electronic expansion valve; 5. a capillary tube; 6. an electromagnetic valve; 7. an indoor unit liquid pipe; 8. an indoor unit air pipe; 9. a first bulb; 10. a second bulb; 11. a third bulb; 12. a high-pressure sensor; 13. a low pressure sensor; 14. an outdoor unit heat exchanger; 15. an outdoor fan; 16. a hot electron expansion valve is manufactured; 17. and a four-way valve.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are not intended to limit the invention thereto.
Referring to fig. 1 and 2, an embodiment of the present invention provides an air conditioner, which includes a compressor 1 and a gas-liquid separator 2, wherein a heat exchange device 3 is disposed on a pipeline at an outlet of the compressor 1, a liquid return port of the gas-liquid separator 2 is connected with a first end of the heat exchange device 3, and a second end of the heat exchange device 3 is connected with an inlet of the compressor 1. Preferably, the liquid return port is formed on a side wall of the gas-liquid separator 2.
In the heating mode, the high-temperature and high-pressure gaseous refrigerant from the compressor 1 passes through the heat exchange device 3, flows through the four-way valve 17, enters the indoor unit through the indoor unit air pipe 8 to emit heat, becomes high-temperature and high-pressure liquid refrigerant, passes through the indoor unit liquid pipe 7, throttles and reduces pressure through the hot electron expansion valve 16, becomes low-pressure liquid refrigerant, returns to the outdoor unit heat exchanger 14 (one side of which is provided with the outdoor fan 15) to absorb heat, enters the gas-liquid separator 2, and then returns to the air suction port of the compressor 1.
If the outdoor ambient temperature is low at this time, the liquid refrigerant in the outdoor heat exchanger 14 is incompletely evaporated, and the liquid refrigerant flows into the gas-liquid separator 2 to generate a liquid product. At this time, the liquid return control element can be opened, so that the accumulated liquid is introduced into the heat exchange device 3 at the high-temperature exhaust side of the compressor 1 and exchanges heat with the heat exchange device, so that the liquid refrigerant flowing back from the gas-liquid separator 2 absorbs heat to become gas, and then enters the air suction port of the compressor 1, thereby avoiding the generation of the accumulated liquid.
Therefore, the high-temperature refrigerant at the exhaust side of the compressor 1 can be used for heating the liquid refrigerant led out of the gas-liquid separator 2 through the heat exchange device 3 to evaporate the liquid refrigerant into a gaseous state, so that the liquid refrigerant in the gas-liquid separator is reduced, the refrigerant liquid accumulation is reduced or reduced, the liquid return phenomenon is prevented, the operation reliability of the compressor is improved, and the service life of the compressor is prolonged.
In the above embodiment, a pipeline may be directly connected to the liquid return port of the gas-liquid separator 2 and the first end of the heat exchange device 3, and the pipeline is kept continuously opened. However, because the compressor is continuously turned on, heat exchange with the high-temperature and high-pressure refrigerant exhausted by the compressor 1 is continuously performed, part of energy of the exhausted refrigerant is lost, the whole heating effect of the system is poor, and the use of a user is affected. For this reason, in a more preferred embodiment, the liquid return port of the gas-liquid separator 2 is connected to the first end of the heat exchange device 3 through a liquid return control element, so that the flow rate of the liquid refrigerant can be precisely controlled to control the refrigerant liquid accumulation in the gas-liquid separator 2, and prevent the liquid return phenomenon.
In one embodiment, when the unit is started under low-temperature effusion, the liquid return control element can be started at the initial stage of starting, so that effusion in the gas-liquid separator 2 is reduced, the amount of circulating gaseous refrigerant in the system is increased, and the running stability of the unit is ensured.
In the embodiment shown in fig. 1, the liquid return control element preferably comprises an electronic expansion valve 4. In the embodiment shown in fig. 2, the liquid return control element preferably comprises a capillary tube 5 and a solenoid valve 6 arranged in series. Compared with the embodiment of fig. 1, in the embodiment of fig. 2, although the adjustability is poor, the operation of the unit cannot be controlled, and the device with higher performance requirements is not applicable, because of adopting a capillary, the device does not need control logic, and has simple structure and low cost.
Therefore, the flow of the liquid refrigerant can be controlled by adopting the electronic expansion valve 4 or the capillary tube 5 and the electromagnetic valve 6, so that the liquid refrigerant is heated and evaporated by the heat exchange device 3 to be changed into a gas state from a liquid state and returned to the suction side of the compressor 1 again, thereby reducing the liquid refrigerant in the gas-liquid separator and ensuring the operation reliability of the compressor.
The invention also provides a control method of the air conditioner, which comprises the following steps:
firstly, acquiring a first temperature at an inlet pipe of a gas-liquid separator 2 of the air conditioner and a second temperature at an outlet pipe of the gas-liquid separator 2;
secondly, if |T1-T2| > T0, the liquid return control element is opened, otherwise, the system can be judged to have no liquid return, and therefore the liquid return control element is directly closed.
Wherein T1 is the first temperature, T2 is the second temperature, and T0 is a first predetermined temperature.
By the above method, it is possible to determine whether or not the liquid accumulation is generated in the gas-liquid separator 2, and to turn on the liquid return control element only when the liquid accumulation is generated. Therefore, when the compressor is continuously started, the heat exchange with the high-temperature and high-pressure refrigerant exhausted by the compressor 1 is continuously performed, part of energy of the exhausted refrigerant is lost, the whole heating effect of the system is poor, the problem of affecting the use of a user is avoided, and the whole heating effect of the system is ensured.
More preferably, the present invention can also control the opening degree of the liquid return control element according to the third temperature at the connecting line between the second end of the heat exchange device 3 and the inlet of the compressor 1, thereby controlling the liquid accumulation amount. Referring to fig. 1 and 2, a first bulb 9 may be used to measure a first temperature, a second bulb 10 may be used to measure a second temperature, and a third bulb 11 may be used to measure a third temperature. A high-pressure sensor 12 is also provided in the line between the compressor 1 and the four-way valve 17, and a low-pressure sensor 13 is provided in the line between the four-way valve 17 and the gas-liquid separator 2.
Specifically, the control method in the invention further comprises the following steps: acquiring a third temperature at a connecting pipeline between a second end of a heat exchange device 3 of the air conditioner and an inlet of the compressor 1; and controlling the opening degree of the liquid return control element according to the magnitude relation between the third temperature and the second preset temperature.
More preferably, when the liquid return control element adopts the electronic expansion valve 4 in the embodiment of fig. 1, the control logic for controlling the opening degree of the liquid return control element according to the magnitude relation between the third temperature and the second predetermined temperature is as follows:
if T3 is less than T, reducing the opening of the liquid return control element by a preset size every preset time; and/or
If T3 is more than T, increasing the opening of the liquid return control element by a preset size every preset time; and/or
If t3=t, the opening degree of the liquid return control element is kept unchanged; wherein T3 is the third temperature, and T is the second predetermined temperature.
For example, the opening degree of the electronic expansion valve 4 may be adjusted to be increased or decreased by a predetermined amount by operating the electronic expansion valve 4 by a predetermined number of steps.
Of course, the liquid return control element can also be the embodiment of fig. 2, i.e. comprising a capillary tube 5 and a solenoid valve 6 arranged in series, in which case the above-mentioned control logic is not needed.
The invention also provides a control device of the air conditioner, which corresponds to the control method, so that the repeated parts of the control method are not repeated here.
Referring to fig. 1 and 2, the control device includes:
the first temperature acquisition module is used for acquiring a first temperature at an inlet pipe of the gas-liquid separator 2 of the air conditioner and a second temperature at an outlet pipe of the gas-liquid separator 2;
and the control module is used for opening the liquid return control element when the temperature is |T1-T2| > T0, and closing the liquid return control element when the temperature is not |T1-T2| > T0, wherein T1 is the first temperature, T2 is the second temperature, and T0 is the first preset temperature.
Preferably, the method further comprises: a second temperature acquisition module for acquiring a third temperature at a connection line between a second end of the heat exchange device 3 of the air conditioner and an inlet of the compressor 1; and the control module controls the opening degree of the liquid return control element according to the magnitude relation between the third temperature and the second preset temperature.
Preferably, the control module includes: the first opening adjusting module is used for reducing the opening of the liquid return control element by a preset size every preset time when T3 is smaller than T; and/or a second opening adjusting module, which is used for increasing the opening of the liquid return control element by a preset size every preset time when T3 is more than T; and/or a third opening adjusting module, configured to keep the opening of the liquid return control element unchanged when t3=t; wherein T3 is the third temperature, and T is the second predetermined temperature.
The invention also provides an air conditioning system which comprises the control device.
Of course, the above is a preferred embodiment of the present invention. It should be noted that it will be apparent to those skilled in the art that several modifications and adaptations can be made without departing from the general principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (14)
1. An air conditioner is characterized by comprising a compressor (1) and a gas-liquid separator (2), wherein a heat exchange device (3) is arranged on a pipeline at the outlet of the compressor (1), a liquid return port of the gas-liquid separator (2) is connected with a first end of the heat exchange device (3), and a second end of the heat exchange device (3) is connected with an inlet of the compressor (1);
the high-temperature refrigerant at the exhaust side of the compressor (1) passes through the heat exchange device (3) to heat the liquid refrigerant led out of the gas-liquid separator (2);
the liquid return port of the gas-liquid separator (2) is connected with the first end of the heat exchange device (3) through a liquid return control element.
2. An air conditioning unit according to claim 1, characterized in that the liquid return control element comprises an electronic expansion valve (4).
3. An air conditioning unit according to claim 1, characterized in that the liquid return control element comprises a capillary tube (5) and a solenoid valve (6) arranged in series.
4. An air conditioning unit according to claim 1, characterized in that the liquid return port is formed in a side wall of the gas-liquid separator (2).
5. A control method of an air conditioner according to claim 1, comprising:
acquiring a first temperature at an inlet pipe of a gas-liquid separator (2) of the air conditioner and a second temperature at an outlet pipe of the gas-liquid separator (2);
and if |T1-T2| > T0, opening the liquid return control element, otherwise, closing the liquid return control element, wherein T1 is the first temperature, T2 is the second temperature, and T0 is the first preset temperature.
6. The control method according to claim 5, characterized by further comprising:
acquiring a third temperature at a connecting pipeline between a second end of a heat exchange device (3) of the air conditioner and an inlet of the compressor (1);
and controlling the opening degree of the liquid return control element according to the magnitude relation between the third temperature and the second preset temperature.
7. The control method according to claim 6, wherein controlling the opening degree of the liquid return control element according to the magnitude relation between the third temperature and the second predetermined temperature includes:
if T3 is less than T, reducing the opening of the liquid return control element by a preset size every preset time; and/or
If T3 is more than T, increasing the opening of the liquid return control element by a preset size every preset time; and/or
If t3=t, the opening degree of the liquid return control element is kept unchanged;
wherein T3 is the third temperature, and T is the second predetermined temperature.
8. The control method according to claim 7, characterized in that the liquid return control element employs an electronic expansion valve (4).
9. The control method according to claim 8, characterized in that the opening degree of the electronic expansion valve (4) is adjusted to be increased or decreased by a predetermined amount by operating the electronic expansion valve (4) by a predetermined number of steps.
10. A control method according to claim 5 or 6, characterized in that the liquid return control element comprises a capillary tube (5) and a solenoid valve (6) arranged in series.
11. A control device of an air conditioner according to claim 1, comprising:
the first temperature acquisition module is used for acquiring a first temperature at an inlet pipe of a gas-liquid separator (2) of the air conditioner and a second temperature at an outlet pipe of the gas-liquid separator (2);
and the control module is used for opening the liquid return control element when the temperature is |T1-T2| > T0, and closing the liquid return control element when the temperature is not |T1-T2| > T0, wherein T1 is the first temperature, T2 is the second temperature, and T0 is the first preset temperature.
12. The control device according to claim 11, characterized by further comprising:
a second temperature acquisition module for acquiring a third temperature at a connection line between a second end of a heat exchange device (3) of the air conditioning device and an inlet of the compressor (1);
and the control module controls the opening degree of the liquid return control element according to the magnitude relation between the third temperature and the second preset temperature.
13. The control device of claim 12, wherein the control module comprises:
the first opening adjusting module is used for reducing the opening of the liquid return control element by a preset size every preset time when T3 is smaller than T; and/or
The second opening adjusting module is used for increasing the opening of the liquid return control element by a preset size every preset time when T3 is more than T; and/or
A third opening adjusting module, configured to keep the opening of the liquid return control element unchanged when t3=t;
wherein T3 is the third temperature, and T is the second predetermined temperature.
14. An air conditioning system comprising the control device according to any one of claims 11 to 13.
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| CN201710720348.1A CN107477930B (en) | 2017-08-21 | 2017-08-21 | Air conditioning system, air conditioning device, control method and control device thereof |
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| CN201710720348.1A CN107477930B (en) | 2017-08-21 | 2017-08-21 | Air conditioning system, air conditioning device, control method and control device thereof |
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| CN107477930B true CN107477930B (en) | 2023-09-08 |
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| CN109405233B (en) * | 2018-10-08 | 2024-01-26 | 珠海格力电器股份有限公司 | Control device and method for air conditioner, air conditioner and storage medium |
| CN111197877B (en) * | 2020-02-26 | 2023-12-19 | 珠海格力电器股份有限公司 | Pressure regulator, outdoor unit, air conditioning system and control method of air conditioning system |
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| CN112629082A (en) * | 2021-01-08 | 2021-04-09 | 珠海格力电器股份有限公司 | Heating control system, multi-split air conditioning system and heating control method |
| CN113339946B (en) * | 2021-05-19 | 2022-08-30 | 广东Tcl智能暖通设备有限公司 | Air conditioner operation control method and device, air conditioner and computer storage medium |
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| CN207197015U (en) * | 2017-08-21 | 2018-04-06 | 珠海格力电器股份有限公司 | Air-conditioning device |
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| CN107477930A (en) | 2017-12-15 |
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