CN110173794B

CN110173794B - Air conditioner and control method and device thereof

Info

Publication number: CN110173794B
Application number: CN201910446563.6A
Authority: CN
Inventors: 刘旭
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2019-05-27
Filing date: 2019-05-27
Publication date: 2021-06-18
Anticipated expiration: 2039-05-27
Also published as: CN110173794A

Abstract

The application provides an air conditioner and a control method and device thereof, wherein the air conditioner comprises a refrigerant liquid storage tank, and the air conditioner comprises the following steps: detecting and identifying the end of defrosting of the air conditioner; and the refrigerant storage tank is controlled to charge refrigerant into the refrigerant loop so as to prevent oil blockage of the air conditioner, avoid burning of the compressor and prolong the service life of the compressor.

Description

Air conditioner and control method and device thereof

Technical Field

The invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method and device thereof.

Background

For combustible refrigerant, engine oil used by a compressor in an air conditioning system is usually mineral oil, the viscosity of common mineral oil can be increased rapidly at low temperature, particularly in a cold-hot frequency converter, when the four-way valve is reversed after defrosting is finished, ultralow-temperature refrigerant and lubricating oil in an evaporator need to enter a condenser through a throttling device, meanwhile, the combustible refrigerant has small system pressure due to small filling amount due to safety consideration, and further causes oil blockage with high viscosity, so that the refrigerant cannot participate in circulation, the compressor idles, the capacity and the power are reduced, and the system is lack of oil and fluorine due to the reduction of the oil level of the compressor, the compressor generates heat excessively after long-time operation, and the service life of the compressor and the system is greatly shortened.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, a first objective of the present invention is to provide a control method for an air conditioner, so as to prevent oil blockage of the air conditioner, avoid burning of the compressor, and prolong the service life of the compressor.

A second object of the present invention is to provide a control device for an air conditioner.

A third object of the present invention is to provide an air conditioner.

A fourth object of the invention is to propose a computer-readable storage medium.

In order to achieve the above object, a first embodiment of the present invention provides a method for controlling an air conditioner, the air conditioner including a refrigerant storage tank, including: detecting and identifying the end of defrosting of the air conditioner; and controlling the refrigerant storage tank to charge the refrigerant into the refrigerant loop.

According to an embodiment of the present invention, the method for controlling an air conditioner further includes: detecting and recognizing that the air conditioner starts defrosting; and controlling a throttle valve at the rear end of the refrigerant liquid storage tank to be closed when the current refrigerant flows.

According to an embodiment of the present invention, after controlling the throttle valve to close, the method further includes: recognizing that the accumulated time for closing the throttle valve reaches a first preset time; and controlling the throttle valve to be opened and controlling the refrigerant liquid storage tank to be closed.

According to an embodiment of the present invention, the method for controlling an air conditioner further includes: detecting and identifying any abnormality of the throttle valve and the refrigerant liquid storage tank; and controlling the air conditioner to stop.

According to one embodiment of the invention, the number of the reversing signals of the four-way valve is detected and identified to be an even number, and the air conditioner is determined to finish defrosting.

According to one embodiment of the invention, the refrigerant reservoir is communicated with a refrigerant pipeline between the indoor unit and the throttling element.

According to the control method of the air conditioner, the refrigerant is charged into the refrigerant loop by controlling the refrigerant storage tank, so that the time for the refrigerant at the rear end of the throttling element to be evacuated is prolonged, and the phenomenon that the throttling element is blocked after the compressor is throttled is effectively prevented.

In order to achieve the above object, a second embodiment of the present invention provides a control device for an air conditioner, including: the detection module is used for detecting and identifying the defrosting end of the air conditioner; and the control module is used for controlling the refrigerant liquid storage tank to charge the refrigerant into the refrigerant loop.

To achieve the above object, an embodiment of a third aspect of the present invention provides an air conditioner, including: a refrigerant storage tank; the control device of the air conditioner.

In order to achieve the above object, a fourth aspect of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the control method of an air conditioner.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a flowchart of a control method of an air conditioner according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;

fig. 3 is a flowchart of a control method of an air conditioner according to an embodiment of the present invention;

fig. 4 is a flowchart of a control method of an air conditioner according to another embodiment of the present invention;

fig. 5 is a flowchart illustrating a method for controlling an air conditioner according to an embodiment of the present invention;

fig. 6 is a block diagram schematically illustrating a control apparatus of an air conditioner according to an embodiment of the present invention;

fig. 7 is a block diagram schematically illustrating an air conditioner according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

An air conditioner and a control method and apparatus thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a flowchart illustrating a control method of an air conditioner according to an embodiment of the present invention. As shown in fig. 1, the method for controlling an air conditioner according to an embodiment of the present invention includes the following steps:

s101: and detecting and identifying the defrosting end of the air conditioner.

S102: and controlling the refrigerant storage tank to charge the refrigerant into the refrigerant loop.

The refrigerant storage tank is communicated with a refrigerant pipeline between the indoor unit and the throttling element, and the throttling element is an electronic expansion valve.

It should be noted that, in the related art, as shown in fig. 2, after defrosting of the air conditioner is finished, the air conditioner returns to the heating mode, the compressor extracts the refrigerant of the outdoor unit and supplies the refrigerant to the indoor unit, a throttling element is disposed between the indoor unit and the outdoor unit, and the refrigerant between the rear end of the throttling element and the outdoor unit is quickly evacuated by the compressor, so that the phenomenon that the throttling element is blocked after the refrigerant is throttled is caused. Therefore, the refrigerant storage tank is arranged between the throttling element and the indoor unit, and the refrigerant is filled into the refrigerant loop through the refrigerant storage tank in a heating state, so that the refrigerant quantity at the rear end of the throttling element is sufficient, the refrigerant in the section of refrigerant pipeline is prevented from being evacuated and deformed (the combustible refrigerant is changed into floccules), the throttling element is further blocked, and the refrigerant discharged to the indoor unit by the compressor is further discharged from the outdoor unit along with the time to form effective refrigerant circulation.

Therefore, after defrosting of the air conditioner is finished, the refrigerant is filled into the refrigerant loop by controlling the refrigerant storage tank, the time for the refrigerant at the rear end of the throttling element to be evacuated is prolonged, and the phenomenon that the throttling element is blocked after the refrigerant is throttled is effectively prevented.

Further, as shown in fig. 3, the method further includes:

s201: the start of defrosting of the air conditioner is detected and recognized.

S202: and controlling the throttle valve at the rear end of the refrigerant liquid storage tank to be closed when the current refrigerant flows.

As shown in fig. 2, a throttle valve is further provided between the refrigerant reservoir and the indoor unit. In the defrosting stage of the air conditioner, the air conditioner is in refrigerating operation, the refrigerant is discharged to the outdoor unit by the compressor and then flows into the indoor unit through the throttling element, the throttling valve is arranged between the throttling element and the indoor unit, the refrigerant can be blocked from flowing to the indoor unit, so that the refrigerant in the section of refrigerant pipeline is accumulated, and the refrigerant enters the liquid storage tank under the pressure (accumulation pressure and/or negative pressure of the refrigerant in the liquid storage tank) because the throttling valve is arranged at the rear end of the refrigerant liquid storage tank in the current refrigerant flowing direction, so that the liquid is filled into the refrigerant liquid storage tank, and the refrigerant liquid storage tank is controlled to fill the refrigerant into the.

Further, as shown in fig. 4, after controlling the throttle valve to close, the method further includes:

s301: recognizing that the accumulated time period for closing the throttle valve reaches a first preset time period.

S302: and controlling the throttle valve to open and controlling the refrigerant liquid storage tank to close.

Wherein, the throttle valve is an electronic stop valve.

That is, during the filling process of the refrigerant liquid storage tank, the refrigerant liquid storage tank is full (and the filling is finished) can be determined according to the time length, that is, the timing is started after the throttle valve is closed to fill the refrigerant liquid storage tank, the refrigerant liquid storage tank is closed when the accumulated filling time reaches the first preset time, the filling of the refrigerant liquid storage tank is stopped, the throttle valve is controlled to be opened, and the circulation of the refrigerant pipeline is recovered.

Therefore, the refrigerant can be charged into the refrigerant pipeline through the refrigerant liquid storage tank in the heating mode of the air conditioner, the phenomenon that the refrigerant at the rear end of the throttling element is quickly pumped out by the compressor to cause oil blockage is avoided, the refrigerant is charged into the refrigerant liquid storage tank in the cooling mode of the air conditioner, the refrigerant is charged in the next heating mode, and the refrigerant forms effective circulation in the system.

According to one embodiment of the invention, the air conditioner is controlled to stop by detecting and identifying the abnormality of any one of the throttle valve and the refrigerant storage tank.

That is, since the refrigerant storage tank is added in the air conditioner, the amount of refrigerant in the air conditioner is increased, when any one of the throttle valve and the refrigerant storage tank is abnormal, the effective circulation of the refrigerant cannot be ensured, and the air conditioner is controlled to stop due to the operation burden of the air conditioner caused by excessive refrigerant.

It should be understood that, under the heating working condition of the air conditioner, the four-way valve is communicated in the first state, when the air conditioner needs defrosting, the four-way valve needs to be controlled to be reversed to be communicated in the second state, after defrosting is completed, the four-way valve needs to be reversed to the first state again, so that the air conditioner can continue heating operation, therefore, when the reversing times of the four-way valve after the air conditioner is started to operate are odd, the air conditioner is in the defrosting state, and when the reversing times of the four-way valve are even, defrosting of the air conditioner is completed. In other words, after the air conditioner operates for a certain period of time, the reversing is performed twice in succession, and it is determined that the defrosting of the air conditioner is completed. Wherein, the starting operation time can be set to 30 minutes, namely, the heating operation of the air conditioner can last for 30 minutes, and two continuous commutations can be detected within 15 minutes, namely, the defrosting time is about 15 minutes.

According to an embodiment of the present invention, as shown in fig. 5, the method comprises the following steps:

s401: the air conditioner is started to operate.

S402: and judging whether the current air conditioner is in a cooling mode.

If yes, returning to the step S401; if not, step S403 is performed.

S403: and judging whether the four-way valve is in a cooling mode (defrosting state in a heating mode) at present.

If yes, go to step S404; if not, step S407 is executed.

S404: the throttle valve is controlled to be closed and the refrigerant storage tank is controlled to be opened.

S405: and judging whether the accumulated time length reaches a first preset time length.

If yes, go to step S406; if not, return to step S405.

S406: and controlling the throttle valve to open and the refrigerant liquid storage tank to close, and returning to the step S403.

S407: and controlling the throttle valve and the refrigerant storage tank to be opened, and returning to the step S403.

In summary, according to the control method of the air conditioner in the embodiment of the invention, the refrigerant storage tank is controlled to charge the refrigerant into the refrigerant loop, so that the time for the refrigerant at the rear end of the throttling element to be evacuated is prolonged, and the phenomenon that the throttling element is blocked after the compressor is throttled is effectively prevented.

In order to implement the above embodiments, the present invention further provides a control device of an air conditioner.

Fig. 6 is a block diagram illustrating a control apparatus of an air conditioner according to an embodiment of the present invention. As shown in fig. 6, the control device 100 of the air conditioner includes: a detection module 10 and a control module 20.

The detection module 10 is used for detecting and identifying the end of defrosting of the air conditioner; the control module 20 is used for controlling the refrigerant storage tank to charge the refrigerant into the refrigerant loop.

Further, the detection module 10 is further configured to: detecting and identifying the start of defrosting of the air conditioner; the control module 20 is further configured to: and controlling the throttle valve at the rear end of the refrigerant liquid storage tank to be closed when the current refrigerant flows.

Further, after controlling the throttle to close, the control module 20 is further configured to: recognizing that the accumulated time for closing the throttle valve reaches a first preset time; and controlling the throttle valve to open and controlling the refrigerant liquid storage tank to close.

Further, the detection module 10 is further configured to detect and identify an abnormality in any one of the throttle valve and the refrigerant reservoir: the control module 20 is further configured to: and controlling the air conditioner to stop.

Further, the detection module 10 is further configured to: and detecting and identifying that the number of the obtained reversing signals of the four-way valve is an even number, and determining that the air conditioner completes defrosting.

Furthermore, the refrigerant storage tank is communicated with a refrigerant pipeline between the indoor unit and the throttling element.

It should be noted that the foregoing explanation of the embodiment of the control method of the air conditioner is also applicable to the control device of the air conditioner of this embodiment, and details are not repeated here.

In order to implement the above embodiments, the present invention further provides an air conditioner, as shown in fig. 7, the air conditioner 200 includes a refrigerant storage tank 201 and a control device 100 of the air conditioner.

Further, the refrigerant storage tank 201 is communicated with a refrigerant pipeline between the indoor unit and the throttling element.

In order to implement the above embodiments, the present invention also proposes a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the aforementioned control method of an air conditioner.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.

The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. The control method of the air conditioner is characterized in that the air conditioner comprises a refrigerant liquid storage tank, the refrigerant liquid storage tank is positioned between an indoor unit and a throttling element, and the control method comprises the following steps:

detecting and recognizing that the air conditioner starts defrosting;

controlling a throttle valve at the rear end of the refrigerant liquid storage tank to be closed when the current refrigerant flows;

recognizing that the accumulated time for closing the throttle valve reaches a first preset time;

controlling the throttle valve to be opened and controlling the refrigerant liquid storage tank to be closed;

detecting and identifying the end of defrosting of the air conditioner;

and controlling the refrigerant storage tank to charge the refrigerant into the refrigerant loop.

2. The control method of an air conditioner according to claim 1, further comprising:

detecting and identifying any abnormality of the throttle valve and the refrigerant liquid storage tank;

and controlling the air conditioner to stop.

3. The control method of an air conditioner according to claim 1, further comprising:

and detecting and identifying that the number of the obtained reversing signals of the four-way valve is an even number, and determining that the air conditioner completes defrosting.

4. The method as claimed in claim 1, wherein the refrigerant reservoir is in communication with a refrigerant line between the indoor unit and the throttling element.

5. The utility model provides a controlling means of air conditioner which characterized in that, the air conditioner includes the refrigerant liquid storage pot, includes:

the detection module is used for detecting and identifying the defrosting end of the air conditioner;

a control module for controlling the refrigerant storage tank to charge the refrigerant loop with the refrigerant, the control module being controlled according to the control method of the air conditioner as claimed in any one of claims 1 to 4.

6. An air conditioner, comprising:

a refrigerant storage tank;

the control device of an air conditioner according to claim 5.

7. The air conditioner according to claim 6, wherein the refrigerant reservoir communicates with a refrigerant pipe between the indoor unit and the throttling element.

8. A computer-readable storage medium on which a computer program is stored, characterized in that the program, when executed by a processor, implements the control method of an air conditioner according to any one of claims 1 to 4.