CN109882988B - Control method and device for preventing air conditioner refrigerant migration and air conditioner - Google Patents

Control method and device for preventing air conditioner refrigerant migration and air conditioner Download PDF

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Publication number
CN109882988B
CN109882988B CN201910186922.9A CN201910186922A CN109882988B CN 109882988 B CN109882988 B CN 109882988B CN 201910186922 A CN201910186922 A CN 201910186922A CN 109882988 B CN109882988 B CN 109882988B
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air conditioner
temperature
control
indoor
delta
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CN109882988A (en
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汪云霞
曾友坚
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Aux Air Conditioning Co Ltd
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Aux Air Conditioning Co Ltd
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Abstract

A control method for preventing air conditioner refrigerant migration includes: after the air conditioner is shut down, detecting the indoor ambient temperature and the outdoor ambient temperature at intervals of first time; and controlling the opening degree of an electronic expansion valve of the air conditioner according to the indoor environment temperature and the outdoor environment temperature. According to the invention, by comparing the indoor and outdoor temperature difference with the preset temperature, and the temperature difference duration with the preset time, the opening degree of the electronic expansion valve can be adjusted when the air conditioner is not used for a long time, and when the indoor and outdoor temperature difference is large, the condition that the refrigerant migrates to the compressor when the temperature difference between the inner side and the outer side is large is prevented or reduced, the operation reliability of the compressor at the starting stage is protected, and the service life of the air conditioner and the use feeling of a user are prevented from being influenced.

Description

Control method and device for preventing air conditioner refrigerant migration and air conditioner
Technical Field
The invention relates to the field of air conditioner control, in particular to a control method and device for preventing air conditioner refrigerant migration and an air conditioner.
Background
When the air conditioner is not used for a long time, under the condition of large temperature difference between the inside and the outside, for example, the indoor temperature reaches 20 ℃ in winter, the outdoor temperature reaches-20 ℃ and the indoor and outdoor temperature reaches 40 ℃, the inside and outside pressure difference is easy to occur, and the refrigerant in the air conditioning system is often transferred under the action of the inside and outside pressure difference, namely, the refrigerant is moved from the high-pressure side (high temperature) to the low-pressure side (low temperature).
However, after the refrigerant medium is transferred to the compressor for a long time, when the compressor is started again, a large amount of liquid refrigerant collected may damage the compressor, reduce the service life of the air conditioner, and affect the use feeling of users.
Disclosure of Invention
In view of the above, the present invention is directed to a control method, a device, and an air conditioner for preventing refrigerant migration of the air conditioner, after the air conditioner is shut down, the temperature difference between the indoor temperature and the outdoor temperature is determined according to the indoor ambient temperature and the outdoor ambient temperature at an interval of the first time, the temperature difference is compared with a preset temperature, and meanwhile, whether the opening of the electronic expansion valve needs to be adjusted is determined according to the duration of the temperature difference, so that when the air conditioner is not used for a long time and the indoor and outdoor temperature difference is large, the refrigerant migration to the compressor when the temperature difference between the inside and the outside is large can be prevented or suppressed, and the operational reliability of the compressor at the start-up stage is.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a control method for preventing air conditioner refrigerant migration includes:
after the air conditioner is shut down, detecting the indoor ambient temperature and the outdoor ambient temperature at intervals of first time;
and controlling the opening degree of an electronic expansion valve of the air conditioner according to the indoor environment temperature and the outdoor environment temperature.
Further, controlling the opening degree of an electronic expansion valve of the air conditioner according to the indoor ambient temperature and the outdoor ambient temperature, specifically comprising the steps of:
according to the indoor ambient temperature TIndoor useAnd outdoor ambient temperature TOutdoorsDetermining the temperature difference delta T ═ TIndoor use-TOutdoors
And controlling the opening degree of an electronic expansion valve of the air conditioner according to the delta T and the preset temperature.
Further, controlling the opening degree of an electronic expansion valve of the air conditioner according to the delta T and the preset temperature T, specifically comprising the steps of:
judging whether the delta T meets the condition that the delta T is more than or equal to T;
if the time duration A of delta T being more than or equal to T and delta T being more than or equal to T is satisfiedPersistenceSatisfies APersistenceAnd if the opening degree of the electronic expansion valve is more than or equal to A, reducing the opening degree of the electronic expansion valve to be minimum, wherein A is preset time.
Further, the first time range is 100-120 h; and/or
The range of the T is 25-30 ℃; and/or
The range of A is 1-2 h.
A control device for preventing air conditioner refrigerant migration includes:
the temperature detection module is used for detecting the indoor environment temperature and the outdoor environment temperature at intervals of first time after the air conditioner is shut down;
and the control module is used for controlling the opening of an electronic expansion valve of the air conditioner according to the indoor environment temperature and the outdoor environment temperature.
Further, the control module includes:
temperature differenceA determination unit for determining the indoor ambient temperature TIndoor useAnd outdoor ambient temperature TOutdoorsDetermining the temperature difference delta T ═ TIndoor use-TOutdoors
And the opening control unit is used for controlling the opening of an electronic expansion valve of the air conditioner according to the delta T and the preset temperature.
Further, the opening degree control unit includes: a judging unit and a control unit, wherein,
if the judging unit judges that the delta T meets the condition that the delta T is more than or equal to T, the duration of the delta T is more than or equal to T, and the duration A of the delta T is more than or equal to TPersistenceSatisfies APersistenceAnd if the opening degree of the electronic expansion valve is more than or equal to A, the control unit is used for reducing the opening degree of the electronic expansion valve to the minimum, and A is preset time.
Further, the first time range is 100-120 h; and/or
The range of the T is 25-30 ℃; and/or
The range of A is 1-2 h.
An air conditioner comprises the control device for preventing the air conditioner refrigerant from migrating.
Compared with the prior art, the control method and device for preventing the air conditioner refrigerant migration and the air conditioner have the following advantages:
(1) after the air conditioner is shut down, determining the temperature difference of indoor and outdoor temperatures at a first interval according to the indoor ambient temperature and the outdoor ambient temperature, and judging whether the opening of the electronic expansion valve needs to be adjusted or not according to the duration time of the temperature difference; therefore, by comparing the indoor and outdoor temperature difference with the preset temperature and the temperature difference duration with the preset time, the opening of the electronic expansion valve can be adjusted when the air conditioner is not used for a long time and the indoor and outdoor temperature difference is large, so that the condition that the refrigerant is transferred to the compressor due to the large temperature difference between the inner side and the outer side is prevented or reduced, the operation reliability of the compressor in the starting stage is protected, and the service life of the air conditioner and the use feeling of a user are prevented from being influenced;
(2) the user can adjust the specific values of the first time, the preset temperature and the preset time according to the performance parameters of the air conditioner, and the air conditioner has high universality.
Drawings
FIG. 1 is a schematic diagram illustrating steps of a control method for preventing refrigerant migration of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a control method for preventing refrigerant migration of an air conditioner according to an embodiment of the present invention;
fig. 3 is a block diagram of a control device for preventing refrigerant migration of an air conditioner according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In view of the technical problem that the refrigerant is migrated to the compressor in the prior art when the air conditioner is not used for a long time and the indoor and outdoor temperature difference is large, so that the operation reliability of the compressor in the starting stage is affected, the invention provides a control method and device for preventing the refrigerant of the air conditioner from migrating and an air conditioner.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic step diagram of a control method for preventing air conditioner refrigerant migration according to an embodiment of the present invention, and fig. 2 is a schematic flow diagram of the control method for preventing air conditioner refrigerant migration according to the embodiment of the present invention, where as shown in fig. 1 and fig. 2, the control method includes the steps of:
s1, detecting the indoor environment temperature and the outdoor environment temperature at intervals of the first time after the air conditioner is shut down;
and S2, controlling the opening degree of an electronic expansion valve of the air conditioner according to the indoor environment temperature and the outdoor environment temperature.
In step S1, a first time when the air conditioner is stoppedIn time, the indoor environment temperature T is respectively detected by the temperature sensor moduleIndoor useAnd outdoor ambient temperature TOutdoors
In step S2, T detected according to step S1Indoor useAnd TOutdoorsAnd the opening of an electronic expansion valve of the air conditioner is controlled, so that the condition that the refrigerant migrates to the compressor when the temperature difference between the inner side and the outer side is large is prevented or reduced, and the operation reliability of the compressor at the starting stage is further influenced.
Still further, step S2 may include the following sub-steps:
s21, according to the indoor environment temperature TIndoor useAnd outdoor ambient temperature TOutdoorsDetermining the temperature difference delta T ═ TIndoor use-TOutdoors
And S22, controlling the opening degree of an electronic expansion valve of the air conditioner according to the delta T and the preset temperature.
In step S22, the opening degree of the electronic expansion valve is controlled by specifically determining the magnitude of Δ T and the preset temperature, and the magnitude of the duration of the relationship between Δ T and the preset temperature and the preset time, so as to accurately determine whether the current state of the air conditioner satisfies the condition of refrigerant migration, and if so, the opening degree of the electronic expansion valve is controlled to be reduced to the minimum, thereby preventing or reducing refrigerant migration and further ensuring the operational reliability of the compressor; if not, the opening degree of the electronic expansion valve is not required to be changed, and the current state is maintained.
Step S22 specifically includes the steps of:
s221, judging whether the delta T meets the condition that the delta T is larger than or equal to T;
s222, if the condition that the delta T is more than or equal to T and the duration A of the delta T is more than or equal to T is metPersistenceSatisfies APersistenceAnd if the opening degree of the electronic expansion valve is more than or equal to A, the opening degree of the electronic expansion valve is reduced to the minimum.
That is, when Δ T ≧ T and APersistenceWhen A is satisfied at the same time, the air conditioner has the risk of refrigerant migration, and the opening degree of the electronic expansion valve needs to be reduced to the minimum at the moment to prevent the refrigerant migration; when the delta T is less than T, the air conditioner has no risk of refrigerant migration, and the user properly adjusts the electronic expansion according to the specific running state of the air conditionerThe opening degree of the expansion valve is just required.
The performance parameters of the air conditioners are different, so that a user can adjust the specific values of the first time, the preset temperature and the preset time, and the first time range is preferably 100-120 h according to the common air conditioner; the range of T is preferably 25-30 ℃; a preferably ranges from 1 to 2 h.
An embodiment of the present invention further provides a control device for preventing air conditioner refrigerant migration, fig. 3 is a schematic block diagram of the control device for preventing air conditioner refrigerant migration according to the embodiment of the present invention, and as shown in fig. 3, the control device includes: the temperature detection module and the control module. The temperature detection module (generally a temperature sensor module) detects the indoor environment temperature and the outdoor environment temperature at intervals of first time after the air conditioner is shut down; and the control module controls the opening of an electronic expansion valve of the air conditioner according to the indoor environment temperature and the outdoor environment temperature.
Wherein the control module comprises: a temperature difference determination unit for determining the indoor environment temperature TIndoor useAnd outdoor ambient temperature TOutdoorsDetermining the temperature difference delta T ═ TIndoor use-TOutdoors(ii) a And the opening control unit is used for controlling the opening of an electronic expansion valve of the air conditioner according to the delta T and the preset temperature.
The opening control unit controls the opening of the electronic expansion valve by judging the magnitude of the delta T and the preset temperature and the magnitude of the duration time and the preset time of the relation between the delta T and the preset temperature, so that whether the current state of the air conditioner meets the condition of refrigerant migration can be accurately judged, and if the current state of the air conditioner meets the condition of refrigerant migration, the opening of the electronic expansion valve can be reduced to the minimum, thereby preventing or reducing the refrigerant migration and further ensuring the operation reliability of the compressor; if not, the opening degree of the electronic expansion valve is not required to be changed, and the current state is maintained.
Still further, the opening degree control unit includes: a judging unit and a control unit, if the judging unit judges that the delta T meets the condition that the delta T is more than or equal to T, the duration of the delta T is more than or equal to T, and the duration A of the delta T is more than or equal to TPersistenceSatisfies APersistenceIf the value is more than or equal to A, the control unitThe element is used for reducing the opening degree of the electronic expansion valve to the minimum, and A is preset time.
That is, when the judging unit judges that Δ T ≧ T and APersistenceWhen A is satisfied at the same time, the air conditioner has the risk of refrigerant migration, and the control unit needs to minimize the opening of the electronic expansion valve to prevent the refrigerant migration; when the judgment unit judges that the delta T is less than T, the air conditioner has no risk of refrigerant migration, and a user can properly adjust the opening of the electronic expansion valve according to the specific running state of the air conditioner.
In addition, as the performance parameters of the air conditioners are different, a user can adjust specific values of the first time, the preset temperature and the preset time, and the range of the first time is determined to be preferably 100-120 h according to a common air conditioner; the range of T is preferably 25-30 ℃; a preferably ranges from 1 to 2 h.
The embodiment of the invention also provides an air conditioner, which is generally an inverter air conditioner using an electronic expansion valve for throttling, and comprises the control device for preventing the refrigerant of the air conditioner from migrating, so that the refrigerant migration can be prevented or reduced, and the starting operation reliability of a compressor is enhanced.
In summary, according to the control method and device for preventing the refrigerant migration of the air conditioner and the air conditioner, after the air conditioner is shut down, the temperature difference between the indoor temperature and the outdoor temperature is determined according to the indoor environment temperature and the outdoor environment temperature at intervals, and whether the opening of the electronic expansion valve needs to be adjusted or not is judged according to the duration time of the temperature difference; therefore, the air conditioner can be not used for a long time by comparing the indoor and outdoor temperature difference with the preset temperature, and the temperature difference duration and the preset time, and when the indoor and outdoor temperature difference is large, the opening degree of the electronic expansion valve is adjusted, the condition that the refrigerant caused by the large temperature difference between the inner side and the outer side is prevented or reduced from migrating to the compressor is prevented, the operational reliability of the compressor in the starting stage is protected, and the service life of the air conditioner is prevented from being influenced and the use feeling of a user is prevented from being influenced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. A control method for preventing air conditioner refrigerant migration is characterized by comprising the following steps:
after the air conditioner is shut down, detecting the indoor ambient temperature and the outdoor ambient temperature at intervals of first time;
and controlling the opening degree of an electronic expansion valve of the air conditioner according to the indoor environment temperature and the outdoor environment temperature.
Controlling the opening degree of an electronic expansion valve of the air conditioner according to the indoor environment temperature and the outdoor environment temperature, and specifically comprising the following steps:
according to the indoor ambient temperature TIndoor useAnd outdoor ambient temperature TOutdoorsDetermining the temperature difference delta T ═ TIndoor use-TOutdoors
And controlling the opening of an electronic expansion valve of the air conditioner according to the delta T, the preset temperature and the duration time of the temperature difference delta T.
2. The control method for preventing refrigerant migration of an air conditioner as claimed in claim 1, wherein the opening degree of an electronic expansion valve of the air conditioner is controlled according to Δ T and a preset temperature T, and the method comprises the following steps:
judging whether the delta T meets the condition that the delta T is more than or equal to T;
if the time A that the delta T is more than or equal to T and the delta T is more than or equal to T is metPersistenceSatisfies APersistenceAnd if the opening degree of the electronic expansion valve is more than or equal to A, reducing the opening degree of the electronic expansion valve to be minimum, wherein A is preset time.
3. The control method for preventing refrigerant migration of an air conditioner as claimed in claim 2, wherein the first time is within a range of 100-120 hours; and/or
The range of the T is 25-30 ℃; and/or
The range of A is 1-2 h.
4. A control device for preventing refrigerant migration of an air conditioner, the control device being the control method according to any one of claims 1 to 3, the control device comprising:
the temperature detection module is used for detecting the indoor environment temperature and the outdoor environment temperature at intervals of first time after the air conditioner is shut down;
and the control module is used for controlling the opening of an electronic expansion valve of the air conditioner according to the indoor environment temperature and the outdoor environment temperature.
5. The control device for preventing refrigerant migration of an air conditioner as claimed in claim 4, wherein the control module comprises:
a temperature difference determination unit for determining the indoor environment temperature TIndoor useAnd outdoor ambient temperature TOutdoorsDetermining the temperature difference delta T ═ TIndoor use-TOutdoors
And the opening control unit is used for controlling the opening of the electronic expansion valve of the air conditioner according to the delta T and the preset temperature.
6. The apparatus of claim 5, wherein the opening degree control unit comprises: a judging unit and a control unit, wherein,
if the judging unit judges that the Delta T meets the condition that the Delta T is not less than T, the duration time of the Delta T is not less than T and the duration time A of the Delta T is not less than TPersistenceSatisfies APersistenceAnd if the opening degree of the electronic expansion valve is more than or equal to A, the control unit is used for reducing the opening degree of the electronic expansion valve to the minimum, and A is preset time.
7. The control device for preventing refrigerant migration of an air conditioner as claimed in claim 6, wherein the first time is in a range of 100-120 h; and/or
The range of the T is 25-30 ℃; and/or
The range of A is 1-2 h.
8. An air conditioner comprising the control device for preventing the refrigerant of the air conditioner from migrating as claimed in any one of claims 4 to 7.
CN201910186922.9A 2019-03-12 2019-03-12 Control method and device for preventing air conditioner refrigerant migration and air conditioner Active CN109882988B (en)

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CN110398099B (en) * 2019-07-26 2021-05-04 广东美的暖通设备有限公司 Heat pump system, control method thereof and air conditioner
CN111829148A (en) * 2020-06-30 2020-10-27 浙江中广电器股份有限公司 Control method for preventing refrigerant migration after shutdown, processor, air conditioner and air source heat pump system

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JP4269353B2 (en) * 1998-07-08 2009-05-27 ダイキン工業株式会社 Air conditioner
CN105465961B (en) * 2015-12-25 2018-04-17 西安交通大学 There is the air conditioner and control method that control refrigerant migration
CN106369719A (en) * 2016-10-08 2017-02-01 珠海格力电器股份有限公司 Heat pump system, control method of heat pump system and air conditioner
CN106440215A (en) * 2016-10-08 2017-02-22 芜湖美智空调设备有限公司 Air conditioner and control method thereof
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