CN211739588U - Air conditioner capable of improving heat exchange performance - Google Patents
Air conditioner capable of improving heat exchange performance Download PDFInfo
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- CN211739588U CN211739588U CN202020213405.4U CN202020213405U CN211739588U CN 211739588 U CN211739588 U CN 211739588U CN 202020213405 U CN202020213405 U CN 202020213405U CN 211739588 U CN211739588 U CN 211739588U
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- F25B31/00—Compressor arrangements
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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
- F25B41/00—Fluid-circulation arrangements
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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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The utility model discloses an air conditioner capable of improving heat exchange performance. Wherein, this air conditioner includes: compressor, indoor heat exchanger and outdoor heat exchanger still include: a first heat exchanger, the first heat exchanger comprising: a first heat exchange pipeline and a second heat exchange pipeline; one end of the first heat exchange pipeline is connected to the exhaust side of the compressor, and the other end of the first heat exchange pipeline is connected to a first port of the indoor heat exchanger; the second heat exchange pipeline is used for circulating a medium which exchanges heat with the refrigerant in the first heat exchange pipeline. The utility model discloses the utilization is located the first heat exchanger between compressor and the indoor heat exchanger, becomes the liquid refrigerant of high temperature high pressure with compressor exhaust high temperature high pressure gaseous state refrigerant condensation under the heating mode for get into the indoor heat exchanger during heating and carry out the exothermic refrigerant of condensation and be the liquid refrigerant of high temperature high pressure, because the heat transfer coefficient of the contact surface of liquid and inside pipe wall is big, thereby can make full use of the liquid refrigerant in the indoor heat exchanger and the difference in temperature of indoor environment, improve heat transfer performance.
Description
Technical Field
The utility model relates to an air conditioner technical field particularly, relates to an air conditioner that can improve heat transfer performance.
Background
In a traditional air conditioning system, during heating, high-temperature and high-pressure gaseous refrigerant from a compressor directly enters an indoor condenser for heat exchange, for a radiation type indoor heat exchanger, the heat exchange coefficient of a contact surface between gas and the inner wall of a pipe is small, the temperature difference between the refrigerant in the pipe and the indoor environment cannot be fully utilized, and the heat exchange performance is poor.
Aiming at the problem that the indoor heat exchanger in the prior art is poor in heat exchange performance during heating, an effective solution is not provided at present.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a can improve heat transfer performance's air conditioner to solve among the prior art relatively poor problem of heat transfer performance when heating of indoor heat exchanger.
In order to solve the technical problem, the embodiment of the utility model provides an air conditioner is provided, including compressor, indoor heat exchanger and outdoor heat exchanger, the air conditioner still includes: a first heat exchanger; the first heat exchanger includes: a first heat exchange pipeline and a second heat exchange pipeline; one end of the first heat exchange pipeline is connected to the exhaust side of the compressor, and the other end of the first heat exchange pipeline is connected to a first port of the indoor heat exchanger; and the second heat exchange pipeline is used for circulating a medium for exchanging heat with the refrigerant in the first heat exchange pipeline.
Optionally, one end of the second heat exchange pipeline is connected to the second port of the indoor heat exchanger, and the other end of the second heat exchange pipeline is connected to the air inlet side of the compressor.
Optionally, the air conditioner further includes: and the first throttling device is connected between the second port of the indoor heat exchanger and the second heat exchange pipeline.
Optionally, a first valve is arranged on a connection pipeline between the second heat exchange pipeline and the air inlet side of the compressor, and is used for controlling the second heat exchange pipeline to be opened or closed according to an operation mode.
Optionally, an inlet of the second heat exchange pipeline is connected to the first medium pipeline, an outlet of the second heat exchange pipeline is connected to the second medium pipeline, and the temperature of the medium in the first medium pipeline is lower than the temperature of the refrigerant in the first heat exchange pipeline.
Optionally, the air conditioner further includes: the defrosting branch is connected with the exhaust side of the compressor at one end and the outdoor heat exchanger at the other end and used for bypassing a first flow of refrigerant discharged by the compressor to the outdoor heat exchanger for defrosting in a defrosting mode; a second valve is arranged on the defrosting branch; the first heat exchanger is further configured to: and in the defrosting mode, the refrigerant with the second flow discharged by the compressor is subjected to heat exchange and then is conveyed to the indoor heat exchanger for condensation.
Optionally, the indoor heat exchanger is a radiant heat exchanger.
Use the technical scheme of the utility model, the utilization is located the first heat exchanger between compressor and the indoor heat exchanger, become high temperature high pressure liquid refrigerant with compressor exhaust high temperature high pressure gaseous state refrigerant condensation under the heating mode, it is high temperature high pressure liquid refrigerant to make to get into the exothermic refrigerant of indoor heat exchanger condensation during heating, to radiant heat exchanger, under the same outside of tubes environment, if liquid is when the same temperature with intraductal gas in the pipe, the heat transfer coefficient of the contact surface of liquid and inside pipe wall is big than the contact surface heat transfer coefficient of gas and inside pipe wall, be promptly in the intraductal outside the pipe under the condition that has the difference in temperature, the temperature of intraductal liquid can more be close to the temperature of outside of tubes wall, consequently, the heat transfer that utilizes first heat exchanger can make full use of the difference in the temperature of refrigerant and the indoor environment in.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioner according to a first embodiment of the present invention;
fig. 2 is another schematic structural diagram of an air conditioner according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of an air conditioner according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of an air conditioner provided in the third embodiment of the present invention;
fig. 5 is a flowchart of an air conditioner control method according to a fourth embodiment of the present invention;
description of reference numerals:
1, a compressor; 2, indoor heat exchanger; 3, an outdoor heat exchanger; 4 first heat exchanger (i.e. the heat exchanger before radiation); 41 a first heat exchange line; 42 a second heat exchange line; 43 a first valve; 5 a first throttling means (i.e. an auxiliary throttling means); 6 defrosting branch circuit; 61 a second valve; 7, a four-way valve; 8 second throttling means (i.e. primary throttling means); 9 oil component; 10 a supercooling means; 11 gas minutes; 12 a first electric heating device; 13 a second electric heating device; 14 silencer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Considering that when a traditional air conditioning system heats, high-temperature and high-pressure gaseous refrigerant coming out of a compressor can directly enter a radiation type indoor heat exchanger for condensation, and the gaseous refrigerant is arranged in an indoor heat exchanger pipe, so that the temperature difference between the refrigerant and the indoor environment cannot be fully utilized, and the heat exchange performance is poor. Therefore, the embodiment of the utility model provides a can improve the scheme of radiant indoor heat exchanger heat transfer performance. The following description will be made in conjunction with various embodiments.
Example one
The embodiment provides an air conditioner, which includes: a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, and a first heat exchanger 4. Wherein, the indoor heat exchanger 2 is a radiation type heat exchanger, and the outdoor heat exchanger 3 is an air-cooled type heat exchanger.
The first heat exchanger 4 is connected between the compressor 1 and the indoor heat exchanger 2, and is used for exchanging heat for a gaseous refrigerant discharged from the compressor 1 in a heating mode to obtain a liquid refrigerant, and conveying the liquid refrigerant to the indoor heat exchanger 2 for condensation. In the heating mode, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor firstly enters the first heat exchanger to be condensed into the high-temperature and high-pressure liquid refrigerant, and then the high-temperature and high-pressure liquid refrigerant enters the indoor heat exchanger to be condensed, so that heating is realized.
The air conditioner of the embodiment utilizes the first heat exchanger positioned between the compressor and the indoor heat exchanger to condense high-temperature high-pressure gaseous refrigerant discharged by the compressor into high-temperature high-pressure liquid refrigerant in the heating mode, so that the refrigerant entering the indoor heat exchanger for condensation and heat release is the high-temperature high-pressure liquid refrigerant, for the radiant heat exchanger, under the same outside environment, if the temperature of liquid in the pipe and the temperature of gas in the pipe are the same, the heat exchange coefficient of the contact surface of the liquid and the inner wall of the pipe is larger than that of the contact surface of the gas and the inner wall of the pipe, namely, under the condition that the temperature difference exists between the inside and the outside of the pipe, the temperature of the outer wall of the pipe can be closer to the temperature of the liquid in the pipe, and therefore, the temperature difference between the refrigerant in the indoor heat exchanger and.
The first heat exchanger may be installed in an indoor unit or an outdoor unit.
Referring to fig. 1 and 2, the first heat exchanger 4 includes: a first heat exchange line 41 and a second heat exchange line 42.
One end of the first heat exchange pipeline 41 is connected to the exhaust side of the compressor 1 (specifically, the first heat exchange pipeline can be connected to the exhaust side of the compressor through the four-way valve), and the other end of the first heat exchange pipeline is connected to the first port of the indoor heat exchanger 2, and is used for introducing gaseous refrigerant discharged from the compressor 1 and medium in the second heat exchange pipeline 42 to exchange heat in the heating mode, and conveying liquid refrigerant obtained through heat exchange to the indoor heat exchanger 2.
The second heat exchange pipeline 42 is used for circulating a medium for exchanging heat with the refrigerant in the first heat exchange pipeline 41. The medium circulating in the second heat exchange pipeline may be a refrigerant in the operation of the unit, or may be a medium (for example, water) for which a user has a heating requirement.
Through the first heat exchange pipeline and the second heat exchange pipeline in the first heat exchanger, the high-temperature high-pressure gaseous refrigerant discharged by the compressor can be subjected to heat exchange to form a high-temperature high-pressure liquid refrigerant, and then the high-temperature high-pressure liquid refrigerant enters the indoor heat exchanger to be condensed, so that the heat exchange performance of the indoor heat exchanger is improved.
Two embodiments of the first heat exchanger will be described with reference to fig. 1 and 2, in which the second heat exchange line is mainly different.
In an alternative embodiment, one end of the second heat exchange line 42 is connected to the second port of the indoor heat exchanger 2, and the other end is connected to the intake side of the compressor 1. In the heating mode, the second heat exchange pipeline introduces the refrigerant flowing out of the indoor heat exchanger to exchange heat with the refrigerant in the first heat exchange pipeline, and the refrigerant after heat exchange is conveyed to the air inlet side of the compressor. In order to improve the heat exchange effect, a first throttling device 5 may be connected between the second port of the indoor heat exchanger 2 and the second heat exchange pipeline 42, and the first throttling device is used for throttling the refrigerant flowing out of the second port of the indoor heat exchanger.
Referring to fig. 1, one end of the second heat exchange pipeline 42 is connected to the second port of the indoor heat exchanger 2 through the first throttling device 5, and the other end is connected to the air inlet side of the compressor 1, and is configured to introduce the refrigerant throttled by the first throttling device 5 flowing out of the indoor heat exchanger 2 in the heating mode to perform heat exchange, and deliver the refrigerant subjected to heat exchange to the air inlet side of the compressor 1.
This embodiment sets up first throttling arrangement 5 in one side of indoor heat exchanger 2, this first throttling arrangement 5 throttles the refrigerant that indoor heat exchanger 2 flows out under the heating mode, the liquid refrigerant of low temperature low pressure after the throttle gets into the second heat transfer pipeline in the first heat exchanger, with the high temperature high pressure gaseous refrigerant in the first heat transfer pipeline carry out the heat transfer, become low temperature low pressure gaseous refrigerant and get back to the compressor side of admitting air, the heat transfer of the high temperature high pressure gaseous refrigerant of first heat exchanger to compressor discharge has been realized to simple mode, and can not influence unit normal operating.
Further, a first valve 43 is disposed on a connection pipeline between the second heat exchange pipeline 42 and the air inlet side of the compressor 1, and is used for controlling the opening and closing of the second heat exchange pipeline 42 according to the operation mode. Specifically, in the heating mode, the first valve is opened to improve the heat exchange performance of the indoor heat exchanger by using the first heat exchanger; and in the refrigeration mode, closing the first valve to ensure that the first heat exchanger does not exchange heat in the refrigeration mode.
In the heating mode, the first valve 43 is opened, and the high-temperature and high-pressure gaseous refrigerant coming out of the compressor 1 enters the first heat exchanger 4 through the four-way valve 7 to exchange heat, becomes a high-temperature and high-pressure liquid refrigerant, and enters the indoor heat exchanger 2. The refrigerant is condensed and released heat through the indoor heat exchanger 2, high-temperature and high-pressure liquid refrigerant is changed into medium-temperature and high-pressure liquid refrigerant, then one part of the refrigerant is throttled by the first throttling device 5 to be changed into low-temperature and low-pressure liquid refrigerant, the refrigerant enters the first heat exchanger 4 to exchange heat with high-temperature and high-pressure gaseous refrigerant, the refrigerant is changed into low-temperature and low-pressure gaseous refrigerant and returns to the air inlet side of the compressor, the other part of the refrigerant is throttled by the second throttling device 8 to be changed into low-temperature and low-pressure liquid refrigerant and enters the outdoor heat exchanger 3, at the moment, the outdoor heat exchanger absorbs heat as an evaporator, the refrigerant.
Under the refrigeration mode, the first valve 43 is closed, the high-temperature high-pressure gaseous refrigerant coming out of the compressor 1 enters the outdoor heat exchanger 3 through the four-way valve 7 to be condensed and released heat, then is throttled by the second throttling device 8 to be low-temperature low-pressure liquid refrigerant, enters the indoor heat exchanger 2 to absorb heat and evaporate to become low-temperature low-pressure gaseous refrigerant, and returns to the air inlet side of the compressor through the first heat exchange pipeline of the first heat exchanger 4 (at the moment, the second heat exchange pipeline is closed, the first heat exchanger does not exchange heat), and the four-way valve 7 circulates according to the.
Referring to fig. 2, in another alternative embodiment, the inlet a of the second heat exchange line 42 is connected to the first medium line, and the outlet B is connected to the second medium line, and the temperature of the medium in the first medium line is lower than the temperature of the refrigerant in the first heat exchange line. In the heating mode, a second heat exchange pipeline introduces a medium from the first medium pipeline to exchange heat with a refrigerant in the first heat exchange pipeline and outputs the medium after heat exchange to the second medium pipeline, wherein the temperature of the medium in the first medium pipeline is lower than that of the medium in the second medium pipeline. Therefore, by utilizing the heat exchange of the first heat exchanger, the refrigerant liquefaction in front of the indoor heat exchanger is realized, the heat exchange performance of the indoor heat exchanger is improved, and a medium with a target temperature can be prepared.
The medium in the second heat exchange pipeline is heated by the heat exchange of the first heat exchanger in the heating mode, so that the medium with the target temperature can be provided for users to use. The medium in this embodiment may be water or another medium that the user has a need for heating. The temperature of the medium flowing through the first medium line is lower than the temperature of the medium flowing through the second medium line. In an exemplary mode, the refrigerant in the first heat exchange pipeline is condensed to release heat, the released heat is absorbed by the cold water in the second heat exchange pipeline, and the hot water after heat exchange can be used by a user, such as heating water or domestic hot water. Therefore, the embodiment not only makes the refrigerant entering the indoor heat exchanger be a high-temperature high-pressure liquid refrigerant in the heating mode, makes full use of the temperature difference between the refrigerant and the indoor environment, improves the heat exchange performance of the indoor heat exchanger, but also can provide the heat medium required by a user, and realizes multiple functions.
In the heating mode, a high-temperature high-pressure gaseous refrigerant from the compressor 1 enters the first heat exchanger 4 through the four-way valve 7 to exchange heat with a medium in the second heat exchange pipeline, becomes a high-temperature high-pressure liquid refrigerant, and enters the indoor heat exchanger 2. The refrigerant is condensed by the indoor heat exchanger 2 to release heat, the high-temperature high-pressure liquid refrigerant is changed into a medium-temperature high-pressure liquid refrigerant, then the refrigerant is throttled by the second throttling device 8 to be changed into a low-temperature low-pressure liquid refrigerant, the low-temperature low-pressure liquid refrigerant enters the outdoor heat exchanger 3, the outdoor heat exchanger is used as an evaporator to absorb heat at the moment, the refrigerant absorbs heat to evaporate, the low-temperature low-pressure liquid refrigerant is changed into a low-temperature low-pressure gaseous. Meanwhile, after heat exchange, the temperature of the medium in the second heat exchange pipeline rises to reach the target temperature, and the medium is output to a user side.
Under the refrigeration mode, high-temperature and high-pressure gaseous refrigerant coming out of the compressor 1 enters the outdoor heat exchanger 3 through the four-way valve 7 to be condensed and released, then is throttled by the second throttling device 8 to be low-temperature and low-pressure liquid refrigerant, enters the indoor heat exchanger 2 to absorb heat and evaporate to become low-temperature and low-pressure gaseous refrigerant, returns to the air inlet side of the compressor through the first heat exchange pipeline of the first heat exchanger 4 (at the moment, the low-temperature gaseous refrigerant in the first heat exchange pipeline cannot exchange heat with low-temperature media in the second heat exchange pipeline), and circulates according to the above steps, so that refrigeration is.
As an alternative embodiment, referring to fig. 1 and 2, the air conditioner may further include: and a defrosting branch 6, having one end connected to the exhaust side of the compressor 1 and the other end connected to the outdoor heat exchanger 3, for bypassing the gaseous refrigerant discharged from the compressor 1 at the first flow rate to the outdoor heat exchanger 3 for defrosting in the defrosting mode. Correspondingly, the first heat exchanger 4 is also used for: and in the defrosting mode, the gaseous refrigerant with the second flow rate discharged by the compressor 1 is subjected to heat exchange to obtain a liquid refrigerant, and the liquid refrigerant is conveyed to the indoor heat exchanger 2 to be condensed. A second valve 61 may be disposed in the defrost branch 6 for controlling the opening and closing of the defrost branch.
This embodiment is under the defrosting mode, compressor exhaust high temperature high pressure gaseous state refrigerant, partly get into outdoor heat exchanger through the defrosting branch road and carry out the condensation heat dissipation, in order to realize outdoor heat exchanger's the frost that changes, another part gets into indoor heat exchanger after the heat transfer of first heat exchanger and realizes heating, from this at defrosting in-process indoor set can continuously heat, guarantee that the indoor environment temperature is stable, avoid bringing uncomfortable experience for the user, and can make full use of refrigerant and indoor environment's the difference in temperature through first heat exchanger under the defrosting mode, improve indoor heat exchanger's heat transfer performance.
If a defrosting branch is provided, a gas-liquid separator (gas separator for short, not shown in fig. 1 and 2) may be provided at the air inlet side of the compressor to perform gas-liquid separation to prevent liquid refrigerant from entering the compressor.
Referring to fig. 1, if the defrosting branch and the second valve are provided, when heating is not defrosting, the first valve 43 is opened, the second valve 61 is closed, and the flow direction of the refrigerant is the same as that described above and will not be described again. When cooling, the first valve 43 and the second valve 61 are both closed, and the refrigerant flow direction is the same as that described above and will not be described again. When heating and defrosting are carried out, the first valve 43 and the second valve 61 are both opened, part of high-temperature and high-pressure gaseous refrigerant from the compressor 1 is bypassed to the outdoor heat exchanger 3 through the defrosting branch 6 to be defrosted to be changed into low-temperature and low-pressure liquid refrigerant, and then enters the gas-liquid separator through the four-way valve 7, and at the moment, the low-temperature and low-pressure liquid refrigerant can be heated by the heating device at the gas-liquid separator to be changed into low-temperature and low-pressure gaseous refrigerant to return to the compressor; the other part of the high-temperature high-pressure gaseous refrigerant enters the first heat exchanger 4 through the four-way valve 7 to exchange heat and is changed into a high-temperature high-pressure liquid refrigerant, the high-temperature high-pressure gaseous refrigerant enters the indoor heat exchanger 2 to be condensed and release heat, the high-temperature high-pressure liquid refrigerant is changed into a medium-temperature high-pressure liquid refrigerant, then, the refrigerant is divided into two paths, one path of refrigerant is throttled by a first throttling device 5 to become low-temperature low-pressure liquid refrigerant, enters a first heat exchanger 4 to exchange heat with high-temperature high-pressure gaseous refrigerant, becomes low-temperature low-pressure gaseous refrigerant and returns to the air inlet side of the compressor, the other path of refrigerant is throttled by a second throttling device 8 to become low-temperature low-pressure liquid refrigerant and enters an outdoor heat exchanger 3, the outdoor heat exchanger is used as an evaporator to absorb heat, the refrigerant absorbs heat and evaporates, becomes low-temperature low-pressure gaseous refrigerant, returns to the air inlet side of the compressor through a four-way valve 7 and a gas-liquid separator, and the refrigerant is.
Referring to fig. 2, if the defrosting branch and the second valve are provided, when heating is not defrosting, the second valve 61 is closed, and the flow direction of the refrigerant is the same as the above and is not described again. When cooling, the second valve 61 is closed, and the refrigerant flow direction is the same as that described above and will not be described again. When heating and defrosting are carried out, the second valve 61 is opened, a part of high-temperature and high-pressure gaseous refrigerant from the compressor 1 is bypassed to the outdoor heat exchanger 3 through the defrosting branch 6 to be defrosted to be changed into low-temperature and low-pressure liquid refrigerant, and then the low-temperature and low-pressure liquid refrigerant enters the gas-liquid separator through the four-way valve 7, and at the moment, the low-temperature and low-pressure liquid refrigerant can be heated by the heating device at the gas-liquid separator to be changed into low-temperature and low-pressure; the other part of high-temperature and high-pressure gaseous refrigerant enters the first heat exchanger 4 through the four-way valve 7 to exchange heat with a medium in the second heat exchange pipeline, the high-temperature and high-pressure gaseous refrigerant is changed into a high-temperature and high-pressure liquid refrigerant, the high-temperature and high-pressure liquid refrigerant enters the indoor heat exchanger 2 to be condensed and released heat, the high-temperature and high-pressure liquid refrigerant is changed into a medium-temperature and high-pressure liquid refrigerant, the medium-temperature and high-pressure liquid refrigerant is throttled by the second throttling device 8 to be changed into a low-temperature and low-pressure liquid refrigerant, the low-temperature and low-pressure liquid refrigerant enters the outdoor heat exchanger 3, the outdoor heat exchanger is used as an evaporator to absorb heat, the refrigerant.
Example two
This embodiment is based on the first embodiment and is described with reference to fig. 3, wherein a specific implementation of the indoor heat exchanger capable of improving heat exchange performance is described. The same or corresponding terms as those of the above-described embodiments are explained, and the description of the present embodiment is omitted. It should be noted, however, that the specific examples are only for better illustration of the present application and should not be construed as unduly limiting the present application.
Referring to fig. 3, when heating is not to be defrosted, the first valve 43 is opened and the second valve 61 is closed. The high-temperature high-pressure gaseous refrigerant from the compressor 1 passes through the oil component 9 and the four-way valve 7, then is subjected to heat exchange through the first heat exchanger 4 to become high-temperature high-pressure liquid refrigerant, and enters the indoor heat exchanger 2. The indoor heat exchanger 2 is a radiation type indoor heat exchanger, and exchanges heat with indoor air through natural convection and exchanges heat with walls, human bodies and other objects through radiation. The high-temperature high-pressure liquid refrigerant is changed into a medium-temperature high-pressure liquid refrigerant through the indoor heat exchanger 2, the medium-temperature high-pressure liquid refrigerant is supercooled through the supercooling device 10, the low-temperature low-pressure liquid refrigerant is throttled through the second throttling device 8 and then enters the outdoor heat exchanger 3, the outdoor heat exchanger is used as an evaporator to absorb heat at the moment, the refrigerant absorbs heat and evaporates, the refrigerant is changed into a low-temperature low-pressure gas refrigerant, and the gas refrigerant goes to the gas branch 11. After gas-liquid separation, the low-temperature and low-pressure gaseous refrigerant enters the air suction port of the compressor 1 to be compressed, and the circulation is performed, so that heating is realized.
A part of the refrigerant flowing out of the indoor heat exchanger 2 directly enters the pipeline a of the supercooling device 10, and enters the outdoor heat exchanger 3 through the second throttling device 8 after being supercooled. The other part of the refrigerant is throttled by the first throttling device 5 and then changed into a low-temperature and low-pressure liquid refrigerant and divided into two paths, one path of the refrigerant enters the pipeline b of the supercooling device 10, the refrigerant in the pipelines a and b can be supercooled in the supercooling device 10, and the refrigerant in the pipeline b is supercooled and then returns to the air inlet side of the compressor through the air branch 11; the other path enters a second heat exchange pipeline 42 of the first heat exchanger 4 to exchange heat with the high-temperature high-pressure gaseous refrigerant in the first heat exchange pipeline 41, so as to be changed into a low-temperature low-pressure gaseous refrigerant, and the low-temperature low-pressure gaseous refrigerant returns to the compressor.
During heating and defrosting, the first valve 43 is opened, the second valve 61 is opened, a part of high-temperature and high-pressure gaseous refrigerant coming out of the compressor 1 is bypassed to the outdoor heat exchanger 3 through the oil component 9 and the defrosting branch 6 to be defrosted to become low-temperature and low-pressure liquid refrigerant, and enters the gas branch 11 through the four-way valve 7, the first heating device 12 heats the liquid refrigerant separated from the gas branch 11 (specifically, the liquid refrigerant separated from the gas branch 11 can be introduced into the accommodating part of the first heating device 12 through a pipeline, the liquid refrigerant in the accommodating part is heated by the heating part, and then the heated gaseous refrigerant is conveyed to the compressor through the pipeline), and the heated low-temperature and low-pressure gaseous refrigerant flows into the compressor. The other part of the high-temperature high-pressure gaseous refrigerant passes through the oil component 9 and the four-way valve 7, then is subjected to heat exchange through the first heat exchanger 4 to become a high-temperature high-pressure liquid refrigerant, and enters the indoor heat exchanger 2. The indoor heat exchanger 2 is a radiation type indoor heat exchanger, and exchanges heat with indoor air through natural convection and exchanges heat with walls, human bodies and other objects through radiation. After passing through the indoor heat exchanger 2, the refrigerant is changed into a liquid refrigerant with medium temperature and high pressure, one part of the refrigerant directly enters the pipeline a of the supercooling device 10, the other part of the refrigerant is changed into a liquid refrigerant with low temperature and low pressure after being throttled by the first throttling device 5, the liquid refrigerant with low temperature and low pressure is divided into two paths, one path of the refrigerant enters the pipeline b of the supercooling device 10 to complete supercooling, then enters the gas branch 11, is heated and evaporated by the first electric heating device 12 at the gas branch 11 to be changed into a gas refrigerant with low temperature and low pressure, and the other path of the refrigerant enters the second heat exchange pipeline of the first heat exchanger 4 to exchange heat and be heated and evaporated. And (3) enabling one part of the low-temperature and low-pressure gaseous refrigerant to enter the compressor for enthalpy injection, and enabling the other part of the low-temperature and low-pressure gaseous refrigerant to be sucked and compressed by the low-pressure side of the compressor, circulating the processes until the defrosting of the outdoor heat exchanger is finished, and switching back to the heating defrosting-free mode.
During cooling, the first valve 43 and the second valve 61 are closed. The high-temperature high-pressure gaseous refrigerant from the compressor 1 passes through the oil component 9 and the four-way valve 7 and enters the outdoor heat exchanger 3, the outdoor heat exchanger is used as a condenser to release heat, then the refrigerant is subcooled through the second throttling device 8 and the subcooling device 10, then the refrigerant is divided into two paths, one path of the refrigerant is throttled by the first throttling device 5 and then changed into a low-temperature low-pressure liquid refrigerant, the refrigerant returns to the pipeline b in the subcooling device 10 to be subcooled, then the refrigerant enters the air branch 11 and is changed into a low-temperature low-pressure gaseous refrigerant through heating, the refrigerant returns to the compressor, the other path of the refrigerant flows through the indoor heat exchanger 2, the indoor heat exchanger is used as an evaporator to absorb heat, the low-temperature low-pressure gaseous refrigerant from the evaporator enters the air branch 11 through the first.
In the embodiment, under the heating defrosting mode or the heating defrosting mode, the refrigerant entering the indoor heat exchanger is a high-temperature high-pressure liquid refrigerant, the temperature difference between the refrigerant and the indoor environment can be fully utilized, and the heat exchange performance of the indoor heat exchanger is improved.
EXAMPLE III
This embodiment is based on the first embodiment, and is described with reference to fig. 4, wherein another specific embodiment capable of improving the heat exchange performance of the indoor heat exchanger is described. The same or corresponding terms as those of the above-described embodiments are explained, and the description of the present embodiment is omitted. It should be noted, however, that the specific examples are only for better illustration of the present application and should not be construed as unduly limiting the present application.
Referring to fig. 4, when heating is not defrosting, the second valve 61 is closed. The high-temperature high-pressure gaseous refrigerant from the compressor 1 passes through the oil component 9 and the four-way valve 7, then passes through the first heat exchanger 4 to exchange heat with the medium in the second heat exchange pipeline, becomes a high-temperature high-pressure liquid refrigerant, and enters the indoor heat exchanger 2. The indoor heat exchanger 2 is a radiation type indoor heat exchanger, and exchanges heat with indoor air through natural convection and exchanges heat with walls, human bodies and other objects through radiation. The high-temperature high-pressure liquid refrigerant is changed into a medium-temperature high-pressure liquid refrigerant through the indoor heat exchanger 2, the medium-temperature high-pressure liquid refrigerant is supercooled through the supercooling device 10, the low-temperature low-pressure liquid refrigerant is throttled through the second throttling device 8 and then enters the outdoor heat exchanger 3, the outdoor heat exchanger is used as an evaporator to absorb heat at the moment, the refrigerant absorbs heat and evaporates, the refrigerant is changed into a low-temperature low-pressure gas refrigerant, and the gas refrigerant goes to the gas branch 11. After gas-liquid separation, the low-temperature and low-pressure gaseous refrigerant enters the air suction port of the compressor 1 to be compressed, and the circulation is performed, so that heating is realized.
A part of the refrigerant flowing out of the indoor heat exchanger 2 directly enters the pipeline a of the supercooling device 10, and enters the outdoor heat exchanger 3 through the second throttling device 8 after being supercooled. The other part of the refrigerant is throttled by the first throttling device 5 and then changed into a low-temperature and low-pressure liquid refrigerant and divided into two paths, one path of the refrigerant enters the pipeline b of the supercooling device 10, the refrigerant in the pipelines a and b can be supercooled in the supercooling device 10, and the refrigerant in the pipeline b is supercooled and then returns to the air inlet side of the compressor through the air branch 11; the other path is heated by a second heating device 13 to become a low-temperature low-pressure gaseous refrigerant and returns to the compressor.
When heating and defrosting are performed, the second valve 61 is opened, a part of high-temperature and high-pressure gaseous refrigerant from the compressor 1 is bypassed to the outdoor heat exchanger 3 through the oil component 9 and the defrosting branch 6 to be defrosted, and is changed into low-temperature and low-pressure liquid refrigerant, and the low-temperature and low-pressure liquid refrigerant enters the gas branch 11 through the four-way valve 7, and the first heating device 12 heats the liquid refrigerant separated from the gas branch 11, and the low-temperature and low-pressure gaseous refrigerant obtained by heating flows into the compressor. The other part of the high-temperature high-pressure gaseous refrigerant passes through the oil component 9 and the four-way valve 7, then exchanges heat with the medium in the second heat exchange pipeline through the first heat exchanger 4, becomes a high-temperature high-pressure liquid refrigerant, and enters the indoor heat exchanger 2. The indoor heat exchanger 2 is a radiation type indoor heat exchanger, and exchanges heat with indoor air through natural convection and exchanges heat with walls, human bodies and other objects through radiation. After passing through the indoor heat exchanger 2, the refrigerant is changed into a liquid refrigerant of medium temperature and high pressure, one part of the refrigerant directly enters the pipeline a of the supercooling device 10, the other part of the refrigerant is changed into a liquid refrigerant of low temperature and low pressure after being throttled by the first throttling device 5, the liquid refrigerant of low temperature and low pressure is divided into two paths, one path of the refrigerant enters the pipeline b of the supercooling device 10 to complete supercooling, then enters the gas branch 11, is heated and evaporated by the first electric heating device 12 at the gas branch 11 to be changed into a gas refrigerant of low temperature and low pressure, and the other path of the refrigerant is heated and evaporated by the second heating device 13 to be. And (3) enabling one part of the low-temperature and low-pressure gaseous refrigerant to enter the compressor for enthalpy injection, and enabling the other part of the low-temperature and low-pressure gaseous refrigerant to be sucked and compressed by the low-pressure side of the compressor, circulating the processes until the defrosting of the outdoor heat exchanger is finished, and switching back to the heating defrosting-free mode.
During cooling, the second valve 61 is closed. The high-temperature high-pressure gaseous refrigerant from the compressor 1 passes through the oil component 9 and the four-way valve 7 and enters the outdoor heat exchanger 3, the outdoor heat exchanger is used as a condenser to release heat, then the refrigerant is subcooled through the second throttling device 8 and the subcooling device 10, then the refrigerant is divided into two paths, one path of the refrigerant is throttled by the first throttling device 5 and then changed into a low-temperature low-pressure liquid refrigerant, the refrigerant returns to the pipeline b in the subcooling device 10 to be subcooled, then the refrigerant enters the air branch 11 and is changed into a low-temperature low-pressure gaseous refrigerant through heating, the refrigerant returns to the compressor, the other path of the refrigerant flows through the indoor heat exchanger 2, the indoor heat exchanger is used as an evaporator to absorb heat, the low-temperature low-pressure gaseous refrigerant from the evaporator enters the air branch 11 through the first.
The refrigerant cycle process of this embodiment is similar to that of the second embodiment, and a second heating device 13 is provided to heat the refrigerant instead of the refrigerant in the second heat exchange pipeline in the first heat exchanger in the second embodiment.
This embodiment is under the defrosting mode of heating or heating for the refrigerant that gets into indoor heat exchanger is high temperature high pressure liquid refrigerant, can make full use of refrigerant and indoor environment's the difference in temperature, improves indoor heat exchanger's heat transfer performance, can also provide the required hot medium of user simultaneously, realizes the multi-functionalization.
Example four
The embodiment provides an air conditioner control method, which is applied to the air conditioner described in the above embodiments. The same or corresponding terms as those of the above-described embodiments are explained, and the description of the present embodiment is omitted. Fig. 5 is a flowchart of an air conditioner control method according to a fourth embodiment of the present invention, and as shown in fig. 5, the method includes the following steps:
and S501, judging the current operation mode of the air conditioner.
And S502, if the current operation mode is a heating mode, controlling the refrigerant discharged by the compressor to enter the first heat exchanger, exchanging heat through the first heat exchanger, and then conveying the refrigerant to the indoor heat exchanger for condensation.
In this embodiment, a high-temperature and high-pressure gaseous refrigerant discharged from a compressor is condensed into a high-temperature and high-pressure liquid refrigerant in a heating mode by using a first heat exchanger located between the compressor and an indoor heat exchanger, so that the refrigerant entering the indoor heat exchanger for condensation and heat release is the high-temperature and high-pressure liquid refrigerant.
As an optional implementation manner, controlling a refrigerant discharged by a compressor to enter a first heat exchanger, exchanging heat by the first heat exchanger, and then conveying the refrigerant to an indoor heat exchanger for condensation, includes: and opening a first valve on a second heat exchange pipeline of the first heat exchanger and a connecting pipeline on the air inlet side of the compressor. The gaseous refrigerant discharged by the compressor is controlled to enter a first heat exchange pipeline in the first heat exchanger, and the gaseous refrigerant exchanges heat with the refrigerant flowing out of the indoor heat exchanger in the second heat exchange pipeline and throttled by the first throttling device and then is changed into a liquid refrigerant. The embodiment corresponds to the air conditioner shown in fig. 1 or fig. 3, and realizes the heat exchange of the high-temperature and high-pressure gaseous refrigerant discharged by the compressor by the first heat exchanger in a simple manner, and the normal operation of the unit is not influenced.
And if the current operation mode is the refrigeration mode, closing a first valve on a second heat exchange pipeline of the first heat exchanger and a connecting pipeline on the air inlet side of the compressor. Whether the first heat exchanger carries out heat exchange can be controlled according to the operation mode by utilizing the first valve, and the influence on the refrigeration operation of the air conditioner is avoided.
And if the current operation mode is the defrosting mode, opening a first valve on a second heat exchange pipeline of the first heat exchanger and a connecting pipeline on the air inlet side of the compressor and a second valve on a defrosting branch, wherein the defrosting branch is connected between the air outlet side of the compressor and the outdoor heat exchanger. The gaseous refrigerant with the first flow rate discharged by the compressor is controlled to bypass the outdoor heat exchanger through the defrosting branch circuit to defrost, the gaseous refrigerant with the second flow rate discharged by the compressor is controlled to enter the first heat exchanger to exchange heat to form liquid refrigerant, and the liquid refrigerant is conveyed to the indoor heat exchanger to be condensed. This embodiment mode can continuously heat at defrosting in-process internal unit, guarantees that indoor environment temperature is stable, avoids bringing uncomfortable experience for the user to can make full use of refrigerant and indoor environment's the difference in temperature through first heat exchanger under the defrosting mode, improve indoor heat exchanger's heat transfer performance.
Corresponding to the air conditioner shown in fig. 2 or fig. 4, the second heat exchange pipeline is communicated with the first medium pipeline and the second medium pipeline, the opening and closing of the second heat exchange pipeline are not required to be controlled, the first heat exchanger can automatically utilize the temperature difference to exchange heat in the heating mode and the defrosting mode, and does not exchange heat in the cooling mode.
Specifically, in the heating mode, gaseous refrigerant discharged from the compressor enters a first heat exchange pipeline in the first heat exchanger, the gaseous refrigerant is changed into liquid refrigerant after exchanging heat with a medium at a first temperature in the second heat exchange pipeline in the first heat exchange pipeline, and the medium at the first temperature in the second heat exchange pipeline is changed into a medium at a second temperature after absorbing heat and is output. The second temperature is the target temperature. Therefore, the refrigerant entering the indoor heat exchanger is a high-temperature high-pressure liquid refrigerant in the heating mode, the temperature difference between the refrigerant and the indoor environment is fully utilized, the heat exchange performance of the indoor heat exchanger is improved, a heat medium required by a user can be provided, and the multifunction is realized.
In a refrigeration mode, the indoor heat exchanger absorbs heat as an evaporator, and low-temperature and low-pressure gaseous refrigerant coming out of the evaporator cannot exchange heat with low-temperature media in the second heat exchange pipeline through the first heat exchange pipeline of the first heat exchanger, namely the first heat exchanger only plays a role in circulation and does not exchange heat.
And in the defrosting mode, a second valve on the defrosting branch is opened, so that continuous heating can be realized during defrosting, the heat exchange performance of the indoor heat exchanger is improved by utilizing the heat exchange of the first heat exchanger, and a medium with a target temperature can be prepared.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (7)
1. An air conditioner includes a compressor, an indoor heat exchanger and an outdoor heat exchanger, and is characterized in that the air conditioner further includes: a first heat exchanger;
the first heat exchanger includes: a first heat exchange pipeline and a second heat exchange pipeline;
one end of the first heat exchange pipeline is connected to the exhaust side of the compressor, and the other end of the first heat exchange pipeline is connected to a first port of the indoor heat exchanger;
and the second heat exchange pipeline is used for circulating a medium for exchanging heat with the refrigerant in the first heat exchange pipeline.
2. The air conditioner of claim 1, wherein one end of the second heat exchange line is connected to the second port of the indoor heat exchanger, and the other end is connected to an air intake side of the compressor.
3. The air conditioner according to claim 2, further comprising: and the first throttling device is connected between the second port of the indoor heat exchanger and the second heat exchange pipeline.
4. The air conditioner as claimed in claim 2, wherein a first valve is provided on a connection line between the second heat exchange line and the air inlet side of the compressor for controlling the opening and closing of the second heat exchange line according to an operation mode.
5. The air conditioner of claim 1, wherein the inlet of the second heat exchange line is connected to a first medium line, the outlet of the second heat exchange line is connected to a second medium line, and the temperature of the medium in the first medium line is lower than the temperature of the refrigerant in the first heat exchange line.
6. The air conditioner according to claim 1, further comprising:
the defrosting branch is connected with the exhaust side of the compressor at one end and the outdoor heat exchanger at the other end and used for bypassing a first flow of refrigerant discharged by the compressor to the outdoor heat exchanger for defrosting in a defrosting mode; a second valve is arranged on the defrosting branch;
the first heat exchanger is further configured to: and in the defrosting mode, the refrigerant with the second flow discharged by the compressor is subjected to heat exchange and then is conveyed to the indoor heat exchanger for condensation.
7. The air conditioner according to any one of claims 1 to 6, wherein the indoor heat exchanger is a radiant heat exchanger.
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| CN201911013492.7A CN110645745A (en) | 2019-10-23 | 2019-10-23 | Air conditioner capable of continuously heating and control method thereof |
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| CN202010120896.2A Pending CN111121353A (en) | 2019-10-23 | 2020-02-26 | Air conditioner capable of improving heat exchange performance and control method thereof |
| CN202020213405.4U Active CN211739588U (en) | 2019-10-23 | 2020-02-26 | Air conditioner capable of improving heat exchange performance |
| CN202010120879.9A Pending CN111102771A (en) | 2019-10-23 | 2020-02-26 | Air conditioning system and control method thereof |
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| CN202010121467.7A Active CN111102772B (en) | 2019-10-23 | 2020-02-26 | Oil return system for low-temperature continuous heating, oil return control method and air conditioning equipment |
| CN202010121492.5A Withdrawn CN111102773A (en) | 2019-10-23 | 2020-02-26 | Circulating system capable of continuously heating, control method thereof and air conditioner |
| CN202010121494.4A Active CN111102774B (en) | 2019-10-23 | 2020-02-26 | Uninterrupted heating air conditioning system, control method thereof and air conditioning equipment |
| CN202020214741.0U Active CN211739591U (en) | 2019-10-23 | 2020-02-26 | Air conditioning system and air conditioning equipment that incessant heats |
| CN202020214004.0U Active CN211739590U (en) | 2019-10-23 | 2020-02-26 | Oil return system for low-temperature continuous heating and air conditioning equipment |
| CN202020214742.5U Active CN211876449U (en) | 2019-10-23 | 2020-02-26 | Circulating system capable of continuously heating and air conditioner |
| CN202010120876.5A Pending CN111102770A (en) | 2019-10-23 | 2020-02-26 | Air conditioning system capable of continuously heating |
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| CN202010121467.7A Active CN111102772B (en) | 2019-10-23 | 2020-02-26 | Oil return system for low-temperature continuous heating, oil return control method and air conditioning equipment |
| CN202010121492.5A Withdrawn CN111102773A (en) | 2019-10-23 | 2020-02-26 | Circulating system capable of continuously heating, control method thereof and air conditioner |
| CN202010121494.4A Active CN111102774B (en) | 2019-10-23 | 2020-02-26 | Uninterrupted heating air conditioning system, control method thereof and air conditioning equipment |
| CN202020214741.0U Active CN211739591U (en) | 2019-10-23 | 2020-02-26 | Air conditioning system and air conditioning equipment that incessant heats |
| CN202020214004.0U Active CN211739590U (en) | 2019-10-23 | 2020-02-26 | Oil return system for low-temperature continuous heating and air conditioning equipment |
| CN202020214742.5U Active CN211876449U (en) | 2019-10-23 | 2020-02-26 | Circulating system capable of continuously heating and air conditioner |
| CN202010120876.5A Pending CN111102770A (en) | 2019-10-23 | 2020-02-26 | Air conditioning system capable of continuously heating |
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| CN202010318282.5A Pending CN111288694A (en) | 2019-10-23 | 2020-04-21 | Air conditioner capable of continuously heating and control method thereof |
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2019
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111121353A (en) * | 2019-10-23 | 2020-05-08 | 珠海格力电器股份有限公司 | Air conditioner capable of improving heat exchange performance and control method thereof |
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| Publication number | Publication date |
|---|---|
| CN111102774A (en) | 2020-05-05 |
| CN111102771A (en) | 2020-05-05 |
| CN211739592U (en) | 2020-10-23 |
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| CN111102773A (en) | 2020-05-05 |
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| CN111102772A (en) | 2020-05-05 |
| WO2021169539A1 (en) | 2021-09-02 |
| CN211739591U (en) | 2020-10-23 |
| CN111121353A (en) | 2020-05-08 |
| CN110645745A (en) | 2020-01-03 |
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