CN107702268B - Valve body control method of multi-connected air conditioner and multi-connected air conditioner - Google Patents
Valve body control method of multi-connected air conditioner and multi-connected air conditioner Download PDFInfo
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- CN107702268B CN107702268B CN201710805201.2A CN201710805201A CN107702268B CN 107702268 B CN107702268 B CN 107702268B CN 201710805201 A CN201710805201 A CN 201710805201A CN 107702268 B CN107702268 B CN 107702268B
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Abstract
The invention discloses a valve body control method of a multi-connected air conditioner, which comprises the following steps: continuously acquiring a difference value A between a compressor discharge temperature value T of a single outdoor unit and an average value Ta of compressor discharge temperatures of all the outdoor units according to a preset time interval; comparing the value of the difference A0 obtained currently with the value of the difference A1 obtained previously; and when the value of the difference A0 is greater than or equal to the value of the difference A1, correcting the opening of the electronic expansion valve body of the outdoor unit of the air conditioner. The invention also provides a multi-connected air conditioner. The invention solves the problem that the opening of the electronic expansion valve body of the existing air conditioner is easy to excessively adjust.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a valve body control method of a multi-connected air conditioner and the multi-connected air conditioner.
Background
The multi-connected air conditioner is favored by the majority of users in recent years, and compared with the traditional air conditioner, the multi-connected air conditioner has obvious advantages in the aspects of energy-saving control, multi-dragging technology and the like, and has more outstanding effects on comfort and convenience. When a plurality of outdoor units of the multi-connected air conditioner are connected in parallel to form a system, the quantity of refrigerants returning to different outdoor units is slightly more or slightly less due to the conditions that the parallel pipe diameters of the outdoor units are not optimized and the pressure loss inside the outdoor units of different models is inconsistent, so that the reliability of the operation of a compressor is reduced, and the service life of the compressor is influenced. In order to solve the problem of refrigerant flow bias when different outdoor units are connected in parallel, the currently adopted method is to correct the opening degree of a valve body of an electronic expansion valve of the outdoor unit so as to achieve the purpose of controlling the refrigerant flow, but the electronic expansion valve is easy to excessively adjust due to the hysteresis of a period of time generated by the opening degree of the valve body.
Disclosure of Invention
The invention mainly aims to provide a valve body control method of a multi-connected air conditioner and the multi-connected air conditioner, and aims to solve the technical problem that the electronic expansion valve is easy to adjust excessively due to the fact that the effect generated by the opening degree of a valve body of the electronic expansion valve has hysteresis for a period of time.
In order to achieve the above object, the present invention provides a valve body control method for a multi-connected air conditioner, comprising the steps of:
continuously acquiring a difference value A between a compressor discharge temperature value T of a single outdoor unit and an average value Ta of compressor discharge temperatures of all the outdoor units according to a preset time interval;
comparing the value of the difference A0 obtained currently with the value of the difference A1 obtained previously;
and when the value of the difference A0 is greater than or equal to the value of the difference A1, correcting the opening of the electronic expansion valve body of the outdoor unit of the air conditioner.
Optionally, the step of correcting the opening of the electronic expansion valve body of the outdoor unit of the air conditioner includes:
judging whether the value of the currently acquired difference value A0 is 0 or not;
when the currently acquired numerical value of the difference value A0 is 0, ending the valve body control method of the multi-connected air conditioner;
when the currently acquired numerical value of the difference value A0 is not 0, judging whether the difference value A0 meets a preset condition, and adjusting the opening degree of a valve body of the electronic expansion valve when the difference value A0 meets the preset condition.
Optionally, the step of determining whether the difference a0 satisfies a preset condition, and adjusting the opening degree of the electronic expansion valve body when the difference a0 satisfies the preset condition includes:
and judging whether the difference A0 belongs to a preset interval range, and adjusting the opening degree of the electronic expansion valve body when the numerical value of the difference A0 belongs to the preset interval range.
Optionally, the preset interval range includes a first preset interval range and a second preset interval range;
when the value of the difference value A0 belongs to a preset interval range, the step of adjusting the opening degree of the electronic expansion valve body comprises the following steps:
when the difference A0 belongs to a first preset interval range, increasing the opening degree of the electronic expansion valve body;
and when the difference A0 belongs to a second preset interval range, reducing the opening degree of the electronic expansion valve body.
Optionally, when the difference a0 belongs to a first preset interval range, the step of increasing the opening degree of the valve body of the electronic expansion valve includes:
when the difference value A0 belongs to a first preset interval range, judging whether the opening of the valve body of the electronic expansion valve is smaller than the maximum opening of the valve body;
and when the opening of the valve body of the electronic expansion valve is smaller than the maximum opening of the valve body, increasing the opening of the valve body of the electronic expansion valve.
Optionally, when the difference a0 falls within a second preset interval range, the step of decreasing the opening degree of the electronic expansion valve body comprises:
when the difference value A0 belongs to a second preset interval range, judging whether the opening degree of the valve body of the electronic expansion valve is larger than the minimum opening degree of the valve body;
and when the opening of the valve body of the electronic expansion valve is larger than the minimum opening of the valve body, reducing the opening of the valve body of the electronic expansion valve.
Optionally, the step of comparing the magnitude of the currently obtained difference value a0 with the magnitude of the previously obtained difference value a1 is followed by:
and when the difference A0 is smaller than the difference A1, returning to the step of continuously acquiring the difference A between the compressor discharge temperature value T of the single outdoor unit and the average value Ta of the compressor discharge temperatures of all the outdoor units according to the preset time interval.
Optionally, the method further comprises:
acquiring the starting time of the multi-connected air conditioner;
and when the starting time is longer than or equal to the preset time, executing the step of continuously acquiring the difference A between the compressor exhaust temperature value T of the single outdoor unit and the average value Ta of the compressor exhaust temperatures of all the outdoor units according to the preset time interval.
In addition, in order to achieve the above object, the present invention further provides a multi-connected air conditioner, which includes a compressor and an electronic expansion valve, and further includes a memory, a processor, and an electronic expansion valve control program stored in the memory and operable on the processor, wherein the electronic expansion valve control program, when executed by the processor, implements the steps of the valve body control method of the multi-connected air conditioner as described above.
Optionally, the multi-connected air conditioner has a plurality of outdoor units, and the plurality of outdoor units are connected in parallel.
According to the valve body control method of the multi-connected air conditioner and the multi-connected air conditioner, the difference value A between the compressor exhaust temperature value T of a single outdoor unit and the average value Ta of the compressor exhaust temperatures of all the outdoor units is continuously obtained according to the preset time interval; comparing the value of the difference A0 obtained currently with the value of the difference A1 obtained previously; and when the value of the difference A0 is greater than or equal to the value of the difference A1, correcting the opening of the electronic expansion valve body of the outdoor unit of the air conditioner. Therefore, the opening of the electronic expansion valve body is corrected when the current opening correction of the electronic expansion valve body has no effect, and the problem of excessive opening adjustment of the electronic expansion valve body is further avoided.
Drawings
FIG. 1 is a schematic flow chart of a valve body control method of a multi-connected air conditioner according to a first embodiment of the present invention;
fig. 2 is a detailed flowchart of step S30 in the second embodiment of the valve body control method of the multi-connected air conditioner according to the present invention;
fig. 3 is a detailed flowchart of step S33 in the third embodiment of the valve body control method of a multi-connected air conditioner according to the present invention;
fig. 4 is a detailed flowchart of step S331 in a fourth embodiment of the valve body control method of a multi-connected air conditioner according to the present invention;
fig. 5 is a detailed flowchart of step S332 in the fourth embodiment of the valve body control method of the multi-split air conditioner according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, in a first embodiment of a valve body control method of a multi-connected air conditioner of the present invention, the valve body control method of the multi-connected air conditioner includes the steps of:
step S10, continuously acquiring a difference value A between a compressor discharge temperature value T of a single outdoor unit and an average value Ta of compressor discharge temperatures of all outdoor units according to a preset time interval;
the embodiment of the invention is suitable for the field of control of multi-connected air conditioners. At present, when a multi-connected air conditioning system or a multi-connected heat pump system with a plurality of outdoor units connected in parallel is used for correcting the opening of a valve body of an electronic expansion valve, the effect of the opening of the valve body is delayed for a while, and the electronic expansion valve is easy to be excessively adjusted. Therefore, the effect of the opening correction of the electronic expansion valve body on the refrigerant flow control can be tested according to the preset time interval, and when a certain condition is reached, the opening correction of the electronic expansion valve body is carried out again.
The electronic expansion valve may be a main electronic expansion valve of a multi-split air conditioner. Alternatively, a specific technical means for testing the effect of the opening correction of the electronic expansion valve body on the refrigerant flow control may be to obtain a difference a between a compressor discharge temperature value T of a single outdoor unit and an average value Ta of compressor discharge temperatures of all the outdoor units. In addition, the preset time interval may also be specifically set according to the models and equipment parameters of different multi-split air conditioners, for example, the preset time interval is 2 minutes.
Step S20, comparing the value of the difference A0 obtained currently with the value of the difference A1 obtained last time;
by comparing the value of the difference value A0 obtained currently with the value of the difference value A1 obtained previously, whether the opening adjustment of the valve body of the electronic expansion valve at the latest time is effective can be known according to the effects of the opening adjustment of the valve body at the previous time and the next time.
And step S30, correcting the opening degree of the electronic expansion valve body of the air conditioner outdoor unit when the value of the difference A0 is larger than or equal to the value of the difference A1.
If the value of the currently acquired difference A0 is greater than or equal to the value of the previously acquired difference A1, it indicates that the last correction of the opening degree of the electronic expansion valve body has no effect, and the opening degree of the electronic expansion valve body needs to be adjusted again. If the value of the currently obtained difference value a0 is smaller than the value of the previously obtained difference value a1, indicating that the most recent electronic expansion valve body opening correction is still effective, the process may continue to step S10.
The correction of the opening degree of the valve body can comprise increasing the opening degree of the valve body of the electronic expansion valve, reducing the opening degree of the valve body of the electronic expansion valve, and exiting the valve body opening degree control step when the current opening degree of the valve body of the electronic expansion valve is adjusted to be saturated.
According to the embodiment of the invention, the difference value A between the compressor discharge temperature value T of a single outdoor unit and the average value Ta of the compressor discharge temperatures of all the outdoor units is continuously obtained according to a preset time interval; comparing the value of the difference A0 obtained currently with the value of the difference A1 obtained previously; when the value of the difference value a0 is greater than or equal to the value of the difference value a1, the opening degree of the electronic expansion valve body of the air conditioner outdoor unit is corrected, so that the effect of the correction of the opening degree of the electronic expansion valve body on the refrigerant flow control before and after a preset time interval can be obtained, whether the current correction result of the opening degree of the valve body is still valid or not is obtained through comparison, and only when the current electronic expansion valve is invalid on the refrigerant flow control, the opening degree of the valve body is adjusted again, so that the electronic expansion valve can be prevented from being excessively adjusted.
In addition, in order to accurately control the opening of the valve body, the execution time of the control scheme of the valve body of the multi-connected air conditioner can be set, and the starting time of the multi-connected air conditioner can be obtained specifically; and when the power-on duration is equal to or greater than the preset duration, executing step S10.
In other embodiments, the step of the valve body control method of the multi-split air conditioner may also be ended after a predetermined time for defrosting and oil returning of the air conditioner is completed, for example, the valve body control step may be skipped 10 minutes after defrosting and oil returning.
Further, referring to fig. 2, a second embodiment of the valve body control method of the multi-connected air conditioner of the present invention is proposed based on the first embodiment of the valve body control method of the multi-connected air conditioner of the present invention, and in this embodiment, the step S30 includes:
step S31, judging whether the value of the difference A0 obtained currently is 0; if yes, go to step S32; if not, go to step S33;
step S32, ending the valve body control method of the multi-connected air conditioner;
and step S33, judging whether the difference A0 meets a preset condition, and adjusting the opening degree of the electronic expansion valve body when the difference A0 meets the preset condition.
In this embodiment, step S30 is further detailed, whether the current outdoor unit refrigerant quantity is appropriate can be known by determining whether the currently obtained value of the difference a0 is 0, and if the currently obtained value of the difference a0 is 0, it indicates that the current air conditioner refrigerant quantity is appropriate, and the opening of the electronic expansion valve body does not need to be corrected; if the currently obtained numerical value of the difference value a0 is not 0, it indicates that the current amount of refrigerant of the outdoor unit of the air conditioner is too much or too little, or that the current opening degree of the valve body of the electronic expansion valve is too large or not enough, and the valve body of the electronic expansion valve needs to be corrected, and the opening degree of the valve body of the electronic expansion valve can be adjusted by setting a preset condition and when the difference value a0 meets the preset condition. By judging whether the numerical value of the difference value A0 is 0 or not and executing the control step according to the result, whether the opening degree of the valve body of the outdoor unit is proper or not is helped to be known in time, and whether the refrigerant quantity of the outdoor unit of the air conditioner is proper or not is further judged.
Further, a third embodiment of the multiple air conditioner valve body control method according to the present invention is proposed based on the second embodiment of the multiple air conditioner valve body control method according to the present invention, and in this embodiment, the step S33 includes: and judging whether the difference A0 belongs to a preset interval range, and adjusting the opening degree of the electronic expansion valve body when the numerical value of the difference A0 belongs to the preset interval range. Further, the preset interval range comprises a first preset interval range and a second preset interval range; referring to fig. 3, the step S33 may include:
step S331, when the difference value A0 belongs to a first preset interval range, increasing the opening degree of the electronic expansion valve body;
and step S332, when the difference value A0 belongs to a second preset interval range, reducing the opening degree of the electronic expansion valve body.
It is understood that the opening degree of the valve body of the electronic expansion valve is insufficient or excessive, and the opening degree of the valve body needs to be increased or decreased correspondingly. The first preset interval range may be a positive preset interval range, and the second preset interval range may be a negative preset period interval range, for example, the opening degree of the electronic expansion valve body may be corrected when the value of a0 belongs to (1, 2), and specifically, the opening degree of the electronic expansion valve body may be decreased by 10 steps when a0 belongs to (-2, -1). That is, the discharge temperature T of the compressor of a single outdoor unit is lower than the average discharge temperature Ta of the compressor of the outdoor unit, and the amount of refrigerant in the current outdoor unit is too large, and the opening of the main electronic expansion valve needs to be reduced to reduce the amount of refrigerant entering the outdoor unit. When A0 belongs to (1, 2), the opening of the main electronic expansion valve is increased by 10 steps. That is, the discharge temperature T of the compressor of the outdoor unit is higher than the average discharge temperature Ta, and the amount of refrigerant entering the outdoor unit is increased by increasing the opening of the electronic expansion valve body. In the embodiment, through further refining the control of the opening of the valve body of the electronic expansion valve, a solution is provided for the outdoor unit of the air conditioner to have more or less refrigerant quantity, the purpose of controlling the refrigerant flow is achieved, the running reliability of the compressor is improved, and the service life of the machine is prolonged.
Further, referring to fig. 4, a fourth embodiment of the valve body control method of the multiple air conditioner of the present invention is proposed based on the third embodiment of the valve body control method of the multiple air conditioner of the present invention, and in this embodiment, the step S331 includes:
step S333, when the difference value A0 belongs to a first preset interval range, judging whether the opening degree of the valve body of the electronic expansion valve is smaller than the maximum opening degree of the valve body;
and step 334, when the opening degree of the valve body of the electronic expansion valve is smaller than the maximum opening degree of the valve body, increasing the opening degree of the valve body of the electronic expansion valve.
It can be understood that the adjustment of the opening degree of the valve body of the electronic expansion valve is limited, the maximum opening degree of the valve body can be set, and the opening degree of the valve body is increased if and only if the current opening degree of the valve body of the electronic expansion valve is smaller than the maximum opening degree of the valve body; and if the opening of the valve body of the current electronic expansion valve is larger than or equal to the maximum opening of the valve body, quitting the valve body control.
In addition, referring to fig. 5, correspondingly, a minimum opening degree of the valve body may also be set, and a specific use process is further detailing step S332, and includes:
step S335, when the difference value A0 belongs to a second preset interval range, judging whether the opening degree of the valve body of the electronic expansion valve is larger than the minimum opening degree of the valve body;
and step S336, when the opening degree of the valve body of the electronic expansion valve is larger than the minimum opening degree of the valve body, reducing the opening degree of the valve body of the electronic expansion valve.
If and only when the opening degree of the valve body of the current electronic expansion valve is larger than the minimum opening degree of the valve body, the opening degree of the valve body is increased; and if the opening of the valve body of the current electronic expansion valve is larger than or equal to the maximum opening of the valve body, quitting the valve body control. The electronic expansion valve body opening degree can be prevented from being excessively adjusted by setting the maximum opening degree and/or the minimum opening degree of the electronic expansion valve body, and the service life of the electronic expansion valve of the multi-connected air conditioner is prolonged.
The invention also provides a multi-connected air conditioner, which is provided with a plurality of outdoor units, and the outdoor units are connected in parallel. The multi-connected air conditioner comprises a compressor and an electronic expansion valve, and in one embodiment, the multi-connected air conditioner further comprises a memory and a processor, wherein the processor is connected with the memory, and an electronic expansion valve control program is stored in the memory. When executed by the processor, the electronic expansion valve control program implements the steps of the valve body control method of the multi-split air conditioner in any of the embodiments, and specifically includes:
continuously acquiring a difference value A between a compressor discharge temperature value T of a single outdoor unit and an average value Ta of compressor discharge temperatures of all the outdoor units according to a preset time interval;
comparing the value of the difference A0 obtained currently with the value of the difference A1 obtained previously;
and when the value of the difference A0 is greater than or equal to the value of the difference A1, correcting the opening of the electronic expansion valve body of the outdoor unit of the air conditioner.
Further, the electronic expansion valve control program when executed by the processor further performs the steps of:
judging whether the value of the currently acquired difference value A0 is 0 or not;
when the currently acquired numerical value of the difference value A0 is 0, ending the valve body control method of the multi-connected air conditioner;
when the currently acquired numerical value of the difference value A0 is not 0, judging whether the difference value A0 meets a preset condition, and adjusting the opening degree of a valve body of the electronic expansion valve when the difference value A0 meets the preset condition.
Further, the electronic expansion valve control program when executed by the processor further performs the steps of:
and judging whether the difference A0 belongs to a preset interval range, and adjusting the opening degree of the electronic expansion valve body when the numerical value of the difference A0 belongs to the preset interval range.
Further, the electronic expansion valve control program when executed by the processor further performs the steps of:
when the difference A0 belongs to a first preset interval range, increasing the opening degree of the electronic expansion valve body;
and when the difference A0 belongs to a second preset interval range, reducing the opening degree of the electronic expansion valve body.
Further, the electronic expansion valve control program when executed by the processor further performs the steps of:
when the difference value A0 belongs to a first preset interval range, judging whether the opening of the valve body of the electronic expansion valve is smaller than the maximum opening of the valve body;
and when the opening of the valve body of the electronic expansion valve is smaller than the maximum opening of the valve body, increasing the opening of the valve body of the electronic expansion valve.
Further, the electronic expansion valve control program when executed by the processor further performs the steps of:
when the difference value A0 belongs to a second preset interval range, judging whether the opening degree of the valve body of the electronic expansion valve is larger than the minimum opening degree of the valve body;
and when the opening of the valve body of the electronic expansion valve is larger than the minimum opening of the valve body, reducing the opening of the valve body of the electronic expansion valve.
Further, the electronic expansion valve control program when executed by the processor further performs the steps of:
and when the difference A0 is smaller than the difference A1, returning to the step of continuously acquiring the difference A between the compressor discharge temperature value T of the single outdoor unit and the average value Ta of the compressor discharge temperatures of all the outdoor units according to the preset time interval.
Further, the electronic expansion valve control program when executed by the processor further performs the steps of:
acquiring the starting time of the multi-connected air conditioner;
and when the starting time is longer than or equal to the preset time, executing the step of continuously acquiring the difference A between the compressor exhaust temperature value T of the single outdoor unit and the average value Ta of the compressor exhaust temperatures of all the outdoor units according to the preset time interval.
The present invention also provides a computer readable storage medium having stored thereon an electronic expansion valve control program, which when executed by a processor, implements all the steps of the valve body control method of the multi-connected air conditioner as described above.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a multi-connected air conditioner (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to perform the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A valve body control method of a multi-connected air conditioner is characterized by comprising the following steps:
continuously acquiring a difference value A between a compressor discharge temperature value T of a single outdoor unit and an average value Ta of compressor discharge temperatures of all the outdoor units according to a preset time interval;
comparing the value of the difference A0 obtained currently with the value of the difference A1 obtained previously;
when the value of the difference value A0 is greater than or equal to the value of the difference value A1, correcting the opening of the electronic expansion valve body of the air conditioner outdoor unit to realize that the opening of the electronic expansion valve body is corrected only when the current correction of the opening of the electronic expansion valve body has no effect, thereby avoiding the problem of excessive adjustment of the opening of the electronic expansion valve body;
the step of comparing the magnitude of the currently obtained difference value a0 with the magnitude of the previously obtained difference value a1 further comprises:
and when the difference A0 is smaller than the difference A1, returning to the step of continuously acquiring the difference A between the compressor discharge temperature value T of the single outdoor unit and the average value Ta of the compressor discharge temperatures of all the outdoor units according to the preset time interval.
2. The valve control method of a multi-type air conditioner according to claim 1, wherein the step of correcting the opening degree of the electronic expansion valve body of the outdoor unit of the air conditioner comprises:
judging whether the value of the currently acquired difference value A0 is 0 or not;
when the currently acquired numerical value of the difference value A0 is 0, ending the valve body control method of the multi-connected air conditioner;
when the currently acquired numerical value of the difference value A0 is not 0, judging whether the difference value A0 meets a preset condition, and adjusting the opening degree of a valve body of the electronic expansion valve when the difference value A0 meets the preset condition.
3. The valve body control method of the multi-connected air conditioner according to claim 2, wherein the step of determining whether the difference value a0 satisfies a preset condition and adjusting the opening degree of the valve body of the electronic expansion valve when the difference value a0 satisfies the preset condition comprises:
and judging whether the difference A0 belongs to a preset interval range, and adjusting the opening degree of the electronic expansion valve body when the numerical value of the difference A0 belongs to the preset interval range.
4. The valve body control method of a multi-connected air conditioner according to claim 3, wherein the preset interval range includes a first preset interval range and a second preset interval range;
when the value of the difference value A0 belongs to a preset interval range, the step of adjusting the opening degree of the electronic expansion valve body comprises the following steps:
when the difference A0 belongs to a first preset interval range, increasing the opening degree of the electronic expansion valve body;
and when the difference A0 belongs to a second preset interval range, reducing the opening degree of the electronic expansion valve body.
5. The valve body control method of the multi-connected air conditioner according to claim 4, wherein when the difference value A0 falls within a first preset interval range, the step of increasing the opening degree of the valve body of the electronic expansion valve comprises:
when the difference value A0 belongs to a first preset interval range, judging whether the opening of the valve body of the electronic expansion valve is smaller than the maximum opening of the valve body;
and when the opening of the valve body of the electronic expansion valve is smaller than the maximum opening of the valve body, increasing the opening of the valve body of the electronic expansion valve.
6. The valve body control method of the multi-type air conditioner according to claim 4, wherein the step of decreasing the opening degree of the valve body of the electronic expansion valve when the difference value A0 falls within a second preset interval range comprises:
when the difference value A0 belongs to a second preset interval range, judging whether the opening degree of the valve body of the electronic expansion valve is larger than the minimum opening degree of the valve body;
and when the opening of the valve body of the electronic expansion valve is larger than the minimum opening of the valve body, reducing the opening of the valve body of the electronic expansion valve.
7. The valve body control method of a multi-type air conditioner according to any one of claims 1 to 6, further comprising:
acquiring the starting time of the multi-connected air conditioner;
and when the starting time is longer than or equal to the preset time, executing the step of continuously acquiring the difference A between the compressor exhaust temperature value T of the single outdoor unit and the average value Ta of the compressor exhaust temperatures of all the outdoor units according to the preset time interval.
8. A multi-connected air conditioner comprising a compressor and an electronic expansion valve, further comprising a memory, a processor and an electronic expansion valve control program stored on the memory and operable on the processor, wherein the electronic expansion valve control program when executed by the processor implements the steps of the valve body control method of the multi-connected air conditioner as claimed in any one of claims 1 to 7.
9. The multi-type air conditioner according to claim 8, wherein the multi-type air conditioner has a plurality of outdoor units, and the plurality of outdoor units are connected in parallel.
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| CN109708271A (en) * | 2018-12-29 | 2019-05-03 | 广东美的暖通设备有限公司 | The control method and its device of outer machine system in parallel |
| CN109506328B (en) * | 2019-01-22 | 2021-03-19 | 广东美的制冷设备有限公司 | Control method of air conditioner electronic expansion valve and air conditioner |
| CN111397176B (en) * | 2020-03-17 | 2021-03-12 | 珠海格力电器股份有限公司 | High-temperature refrigeration control method and device and air conditioning equipment |
| CN113531783B (en) * | 2021-07-21 | 2022-06-28 | 四川虹美智能科技有限公司 | Refrigeration anti-freezing control method and device of multi-connected air conditioning system |
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| KR100667167B1 (en) * | 2005-05-13 | 2007-01-12 | 삼성전자주식회사 | Method for controlling operation of a multi air conditioner system |
| JP5352512B2 (en) * | 2010-03-31 | 2013-11-27 | 日立アプライアンス株式会社 | Air conditioner |
| CN102353121B (en) * | 2011-09-13 | 2013-08-28 | Tcl空调器(中山)有限公司 | Control method of refrigerant flow of multi-connected unit |
| CN103512153B (en) * | 2013-07-16 | 2016-08-31 | 广东美芝制冷设备有限公司 | Air-conditioning system with enthalpy increased through vapor injection and control method thereof |
| CN103776131B (en) * | 2014-01-17 | 2016-05-25 | 苏州海特温控技术有限公司 | The control method of electric expansion valve when a kind of air conditioner refrigerating |
| CN104566823B (en) * | 2014-12-29 | 2018-03-16 | 广东美的暖通设备有限公司 | The refrigerant control method of multi-connected machine in parallel |
| CN104776659A (en) * | 2015-04-14 | 2015-07-15 | 四川长虹空调有限公司 | Multi-split air conditioner refrigerant balancing control method and air conditioning system for achieving same |
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