CN109114749B - Control method and device for air conditioning system - Google Patents
Control method and device for air conditioning system Download PDFInfo
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- CN109114749B CN109114749B CN201810724385.4A CN201810724385A CN109114749B CN 109114749 B CN109114749 B CN 109114749B CN 201810724385 A CN201810724385 A CN 201810724385A CN 109114749 B CN109114749 B CN 109114749B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 46
- 239000003507 refrigerant Substances 0.000 claims abstract description 338
- 238000011084 recovery Methods 0.000 claims description 82
- 238000002347 injection Methods 0.000 claims description 68
- 239000007924 injection Substances 0.000 claims description 68
- 101100277863 Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd) dksA gene Proteins 0.000 claims description 12
- 230000008569 process Effects 0.000 abstract description 16
- 230000008859 change Effects 0.000 abstract description 12
- 239000007788 liquid Substances 0.000 description 26
- 238000012937 correction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000009491 slugging Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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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
- F24F11/46—Improving electric energy efficiency or saving
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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Abstract
The invention discloses a control method for an air conditioning system, and belongs to the technical field of air conditioning control. The air conditioning system comprises a refrigerant storage device arranged between an evaporator and a condenser; the method comprises the following steps: determining a difference Dsh obtained by subtracting a set superheat Th from a current superheat Ts of the air-conditioning system; and controlling the refrigerant storage device to adjust the refrigerant quantity in the refrigerant circulation pipeline according to the difference Dsh so as to adjust the superheat degree of the air-conditioning system and control the air-conditioning system to be in the optimal running state. The air conditioning system is additionally provided with the refrigerant storage device between the evaporator and the condenser, the refrigerant storage device is controlled to change the amount of the refrigerant in the refrigerant circulation pipeline according to the difference value obtained by subtracting the set superheat degree from the superheat degree of the air conditioner so as to adjust the superheat degree of the air conditioning system and control the air conditioning system to be in the optimal running state, the control process is simple, the speed of adjusting the state of the air conditioning system is improved, and the safety and the user experience of the air conditioning system are improved. The invention also discloses a control device for the air conditioning system.
Description
Technical Field
The invention relates to the technical field of air conditioner control, in particular to a control method and device for an air conditioner system.
Background
The test of the household air conditioner adopts a standard working condition, and the air conditioner can be in a better working state under the standard working condition. In the practical application process of a user, the indoor temperature and the outdoor temperature have great difference with the standard working condition, so that the air conditioner cannot work in the best state, and the energy efficiency is low. The optimal working state of the air conditioner is usually judged by the superheat degree, the superheat degree is the difference value between the temperature of a coil pipe at the middle position of an evaporator and a condenser and the temperature of a return pipe of a compressor, and when the superheat degree is zero, the air conditioner works in the optimal state. Under normal conditions, when the superheat degree is not zero, the air conditioning system can adjust the working state by adjusting the frequency of a compressor, the running speed of a fan or the opening degree of an expansion valve so as to ensure the optimal working state of the air conditioner. When the outdoor environment is severe, the self regulation of the air conditioning system is difficult to ensure that the air conditioner works in the optimal state.
Taking refrigeration as an example, in spring and early autumn, the indoor and outdoor temperature is lower than the standard working condition, the refrigerant at the air return pipe of the compressor is far from being completely vaporized, so that the liquid return phenomenon is caused, the capacity of the air conditioning system is not fully exerted, and the risk of liquid impact caused by the liquid refrigerant flowing into the compressor exists; in the summer season, the indoor and outdoor ambient temperatures are higher than the standard working condition, the refrigerant is completely volatilized in the evaporator, and the refrigerant flows to the compressor and is superheated gas, so that the refrigeration effect is poor, the power consumption is increased, and the energy efficiency of the air conditioner is poor. At this time, the air conditioner has a complicated adjusting process of adjusting the operating state of the air conditioner by adjusting the frequency of the compressor, the operating speed of the fan, or the opening degree of the expansion valve, and it is difficult to adjust the state of the air conditioner to an optimal operating state.
Disclosure of Invention
The embodiment of the invention provides a control method and a control device for an air conditioning system, and aims to solve the problems that in the prior art, the process of adjusting the superheat degree of an air conditioner by adjusting the frequency of a compressor, the running speed of a fan or the opening degree of an expansion valve is complex, and the air conditioning state is difficult to adjust to the optimal working state. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of embodiments of the present invention, there is provided a control method for an air conditioning system, the air conditioning system including a refrigerant storage device disposed between an evaporator and a condenser; the method comprises the following steps: determining a difference Dsh obtained by subtracting a set superheat Th from a current superheat Ts of the air-conditioning system; and controlling the refrigerant storage device to adjust the refrigerant quantity in the refrigerant circulation pipeline according to the difference Dsh so as to adjust the superheat degree of the air-conditioning system and control the air-conditioning system to be in the optimal running state.
Optionally, in order to avoid damage to the air conditioning system when the change of the superheat degree is not found timely, the difference Dsh between the current superheat degree Ts of the air conditioning system and the set superheat degree Th is determined at set time intervals.
Optionally, the controlling the refrigerant storage device to adjust the amount of the refrigerant in the refrigerant circulation pipeline according to the difference Dsh includes: when the difference Dsh is smaller than a first set value, controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulating pipeline; when the difference Dsh is larger than a second set value, controlling the refrigerant storage device to inject a refrigerant into the refrigerant circulating pipeline; wherein the first set value is less than or equal to the second set value.
Optionally, when the difference Dsh is smaller than a first set value, controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline includes: when the difference value Dsh is greater than or equal to a third set value and less than the first set value, controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline at a first recovery speed Vs 1; when the difference value Dsh is smaller than the third set value, controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline at a second recovery speed Vs 2; wherein the second recovery speed Vs2 is greater than the first recovery speed Vs 1.
Optionally, when the difference Dsh is greater than a second set value, controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline includes: when the difference value Dsh is greater than the second set value and less than or equal to a fourth set value, controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline at a first injection speed Vp 1; when the difference value Dsh is larger than the fourth set value, controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline at a second injection speed Vp 2; wherein the second injection velocity Vp2 is greater than the first injection velocity Vp 1.
Optionally, the controlling the refrigerant storage device to adjust the amount of the refrigerant in the refrigerant circulation pipeline according to the difference Dsh includes: when the difference Dsh is smaller than a fifth set value, determining a target recovery speed according to a difference delta Dsh1 obtained by subtracting the fifth set value from the difference Dsh; controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline according to the target recovery speed; when the difference Dsh is larger than a sixth set value, determining a target injection speed according to a difference delta Dsh2 obtained by subtracting the sixth set value from the difference Dsh; and controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline according to the target recovery speed.
Optionally, the target recovery rate is determined according to the following formula:
Vs3＝-(a*△Dsh1+b)
wherein Vs3 is the target recovery speed, a is an adjustment coefficient of the target recovery speed, and b is a correction coefficient of the target recovery speed.
Optionally, the target injection rate is determined according to the following formula:
Vp4＝c*△Dsh1+d
wherein Vp4 is the target injection velocity, a is an adjustment coefficient of the target injection velocity, and b is a correction coefficient of the target injection velocity.
According to a second aspect of the embodiments of the present invention, there is provided a control device for an air conditioning system, the air conditioning system including a refrigerant storage device disposed between an evaporator and a condenser; the device comprises: the determining unit is used for determining a difference Dsh obtained by subtracting a set superheat Th from the current superheat Ts of the air-conditioning system; and the adjusting unit is used for controlling the refrigerant storage device to adjust the refrigerant quantity in the refrigerant circulating pipeline according to the difference Dsh so as to adjust the superheat degree of the air-conditioning system and control the air-conditioning system to be in the optimal running state.
Optionally, in order to avoid damage to the air conditioning system when the change of the superheat degree is not found timely, the difference Dsh between the current superheat degree Ts of the air conditioning system and the set superheat degree Th is determined at set time intervals.
Optionally, the adjusting unit includes: the recovery unit is used for controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulating pipeline when the difference Dsh is smaller than a first set value; the injection unit is used for controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulating pipeline when the difference Dsh is larger than a second set value; wherein the first set value is less than or equal to the second set value.
Optionally, the recycling unit includes: a first recovery subunit, configured to control the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline at a first recovery speed Vs1 when the difference Dsh is greater than or equal to a third setting value and smaller than the first setting value; the second recovery subunit is configured to, when the difference Dsh is smaller than the third set value, control the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline at a second recovery speed Vs 2; wherein the second recovery speed Vs2 is greater than the first recovery speed Vs 1.
Optionally, the injection unit includes: the first injection subunit is used for controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline at a first injection speed Vp1 when the difference Dsh is greater than the second set value and less than or equal to a fourth set value; the second injection subunit is used for controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulating pipeline at a second injection speed Vp2 when the difference value Dsh is greater than the fourth set value; wherein the second injection velocity Vp2 is greater than the first injection velocity Vp 1.
Optionally, the adjusting unit includes: the first calculating unit is used for determining a target recovery speed according to a difference value delta Dsh1 obtained by subtracting a fifth set value from the difference value Dsh when the difference value Dsh is smaller than the fifth set value; the third recovery subunit is used for controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline according to the target recovery speed; the second calculating unit is used for determining the target injection speed according to the difference value Dsh2 obtained by subtracting the sixth set value from the difference value Dsh when the difference value Dsh is larger than the sixth set value; and the third injection subunit controls the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline according to the target recovery speed.
Optionally, the target recovery rate is determined according to the following formula:
Vs3＝-(a*△Dsh1+b)
wherein Vs3 is the target recovery speed, a is an adjustment coefficient of the target recovery speed, and b is a correction coefficient of the target recovery speed.
Optionally, the target injection rate is determined according to the following formula:
Vp4＝c*△Dsh1+d
wherein Vp4 is the target injection velocity, a is an adjustment coefficient of the target injection velocity, and b is a correction coefficient of the target injection velocity.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the air conditioning system in the embodiment of the invention is additionally provided with the refrigerant storage device between the evaporator and the condenser, and the refrigerant storage device is controlled to change the amount of the refrigerant in the refrigerant circulation pipeline according to the difference value obtained by subtracting the set superheat degree from the superheat degree of the air conditioner so as to adjust the superheat degree of the air conditioning system and control the air conditioning system to be in the optimal running state.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a flow diagram illustrating a control method for an air conditioning system according to an exemplary embodiment;
fig. 2 is a block diagram illustrating a structure of a control apparatus for an air conditioning system according to an exemplary embodiment;
fig. 3 is a block diagram illustrating a structure of a control apparatus for an air conditioning system according to an exemplary embodiment;
fig. 4 is a block diagram illustrating a structure of a control apparatus for an air conditioning system according to an exemplary embodiment;
fig. 5 is a block diagram illustrating a structure of a control apparatus for an air conditioning system according to an exemplary embodiment.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus 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, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the methods, products and the like disclosed by the embodiments, the description is simple because the methods correspond to the method parts disclosed by the embodiments, and the related parts can be referred to the method parts for description.
In the embodiment of the invention, the superheat degree is the difference value between the temperature of the coil pipe at the middle position of the evaporator and the condenser and the temperature of the return pipe of the compressor.
The superheat degree reflects the running state of the air conditioning system, and the value of the superheat degree is positive or negative along with the fact that the temperature of a coil pipe at the middle position of an evaporator and a condenser is higher or lower than the temperature of a return air pipe of a compressor. The prior art discloses a plurality of methods for adjusting the superheat degree of an air conditioning system by adjusting the frequency of a compressor, the running speed of a fan or the opening degree of an expansion valve, but the factor angle needs to be considered, the refrigeration effect of the air conditioning system needs to be considered in the process of adjusting the superheat degree, discomfort brought to a user is avoided, and the user experience is reduced. When the environment of the air conditioning system is severe, the control method in the prior art has the risk of liquid slugging caused by liquid refrigerant flowing into the compressor due to slow superheat degree speed adjustment. The present invention provides a new air conditioning system and a control method thereof, wherein a refrigerant storage device is additionally arranged between an evaporator and a condenser, and is used for recovering a refrigerant from a refrigerant circulation pipeline or injecting the refrigerant into the refrigerant circulation pipeline, so that an adjustment speed is increased.
Fig. 1 shows a control method for an air conditioning system according to an embodiment of the present invention, including:
and step S101, determining a difference Dsh obtained by subtracting a set superheat Th from the current superheat Ts of the air-conditioning system.
And step S102, controlling the refrigerant storage device to adjust the refrigerant quantity in the refrigerant circulation pipeline according to the difference Dsh.
The air conditioner is in an optimal state when the superheat degree is zero theoretically, and the superheat degree keeps fluctuating near the set superheat degree Th in the operation process of the air conditioning system under the standard working condition through multiple tests. The set superheat Th is preset in the air conditioning system, and in the process of adjusting the air conditioning system, whether the current superheat Ts of the air conditioning system meets the operation standard or not is determined by taking the set superheat Th as a reference value, namely whether the air conditioning system operates in the optimal working state or not is determined.
In step S101, the difference Dsh is the difference between the current superheat Ts and the set superheat Th. According to the change of the current superheat degree Ts, the difference Dsh can be positive or negative, and the situation that the current superheat degree Ts is equal to the set superheat degree Th can also exist. When the difference Dsh is zero, the refrigerant storage device does not need to be adjusted.
In step S102, the refrigerant storage device adjusts the amount of refrigerant in the refrigerant circulation pipeline, so as to change the heat exchange efficiency between the refrigerant and the surrounding environment, increase the adjusting speed of the superheat degree, and shorten the time for the air conditioner to recover to the optimal operation state. In the process, the working frequency of the compressor of the air conditioning system, the rotating speed of the indoor fan and the opening degree of the expansion valve cannot be changed, the air outlet state of the air conditioner is maintained in a stable state, and discomfort to a human body cannot be caused, so that the user experience is improved. Meanwhile, liquid impact caused by liquid refrigerant flowing into the compressor in the refrigerant circulating pipeline is avoided, and the safety of the air conditioning system is improved.
The air conditioning system in the embodiment of the invention is additionally provided with the refrigerant storage device between the evaporator and the condenser, and the refrigerant storage device is controlled to change the amount of the refrigerant in the refrigerant circulation pipeline according to the difference value obtained by subtracting the set superheat degree from the superheat degree of the air conditioner so as to adjust the superheat degree of the air conditioning system and control the air conditioning system to be in the optimal running state.
In the foregoing embodiment, in step S102, the refrigerant storage device is controlled to adjust the refrigerant amount in the refrigerant circulation pipeline according to the difference Dsh.
In some optional embodiments, the step S102 of controlling the refrigerant storage device to adjust the refrigerant volume in the refrigerant circulation pipeline according to the difference Dsh includes:
when the difference Dsh is smaller than a first set value, controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulating pipeline; when the difference Dsh is larger than a second set value, controlling the refrigerant storage device to inject a refrigerant into the refrigerant circulating pipeline; wherein the first set value is less than or equal to the second set value.
When the difference value Dsh is smaller than a first set value, the refrigerant at the muffler of the compressor is not completely vaporized under the current state, and the liquid return phenomenon is caused. In order to avoid liquid impact caused by liquid refrigerant flowing into the compressor and ensure that the refrigerant is completely vaporized when finally flowing out of the evaporator, the amount of the refrigerant flowing into the evaporator needs to be reduced, and at the moment, the refrigerant storage device is controlled and controlled to recover part of the refrigerant from the refrigerant circulation pipeline.
Similarly, when the difference Dsh is greater than the second set value, it indicates that the refrigerant has completely volatilized in the evaporator in the current state, and the refrigerant has been superheated gas flowing to the compressor, and the refrigerant needs to be injected into the refrigerant circulation pipeline to reduce the superheat degree.
In some alternative embodiments, the first set point and the second set point are equal, and the first set point and the second set point are zero. In some alternative embodiments, the absolute values of the first and second set points are equal. The first set value is less than zero and the second set value is greater than zero. Along with the operation of the air conditioner, the superheat degree can be changed continuously, the difference Dsh is in the range from the first set value to the second set value, although a liquid return phenomenon exists, the risk of liquid impact caused by liquid refrigerant flowing into the compressor is very small and can be ignored.
When the difference value Dsh is smaller than the first set value, the risk of liquid slugging caused by the liquid refrigerant flowing into the compressor is increased along with the increase of the difference value between the difference value Dsh and the first set value, and when the difference value Dsh is larger than the second set value, the risk of liquid slugging caused by the liquid refrigerant flowing into the compressor is increased along with the increase of the difference value between the difference value Dsh and the second set value. In order to accelerate the adjusting speed, the adjusting speed of the refrigerant quantity in the refrigerant circulating pipeline is changed according to the difference value Dsh and the first set value or the second set value.
Optionally, when the difference Dsh is smaller than a first set value, controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline includes:
when the difference value Dsh is greater than or equal to a third set value and less than the first set value, controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline at a first recovery speed Vs 1; when the difference value Dsh is smaller than the third set value, controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline at a second recovery speed Vs 2; wherein the second recovery speed Vs2 is greater than the first recovery speed Vs 1.
Optionally, when the difference Dsh is greater than a second set value, controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline includes:
when the difference value Dsh is greater than the second set value and less than or equal to a fourth set value, controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline at a first injection speed Vp 1;
when the difference value Dsh is larger than the fourth set value, controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline at a second injection speed Vp 2; wherein the second injection velocity Vp2 is greater than the first injection velocity Vp 1.
Optionally, the refrigerant storage device includes a compressor, and is configured to recover the refrigerant from the refrigerant circulation pipeline or inject the refrigerant into the refrigerant circulation pipeline. And adjusting the working frequency of a compressor of the refrigerant storage device when the refrigerant storage device is controlled to recover the refrigerant from the refrigerant circulation pipeline at different speeds, wherein the higher the working frequency of the compressor of the refrigerant storage device is, the faster the recovery speed is. For example: when the refrigerant storage device is controlled to recover the refrigerant from the refrigerant circulation pipeline at a first recovery speed Vs1, the working frequency of a compressor of the refrigerant storage device is controlled to be 20hz, and when the refrigerant storage device is controlled to recover the refrigerant from the refrigerant circulation pipeline at a second recovery speed Vs2, the working frequency of the compressor of the refrigerant storage device is increased, and the working frequency of the compressor of the refrigerant storage device is adjusted to be 40 hz. Similarly, the working frequency of the compressor of the refrigerant storage device is adjusted when the refrigerant storage device is controlled to inject the refrigerant into the refrigerant circulation pipeline at different speeds, and the higher the working frequency of the compressor of the refrigerant storage device is, the faster the injection speed is.
Optionally, the refrigerant storage device includes a refrigerant recovery port and a refrigerant injection port, the opening degrees of the refrigerant recovery port and the refrigerant injection port are adjustable, the opening degree of the refrigerant recovery port is adjusted when the refrigerant storage device is controlled to recover the refrigerant from the refrigerant circulation pipeline at different speeds, and the recovery speed is faster as the opening degree of the refrigerant recovery port is larger. Similarly, the opening degree of the refrigerant injection port is adjusted when the refrigerant storage device is controlled to inject the refrigerant into the refrigerant circulation pipeline at different speeds, and the injection speed is faster as the opening degree of the refrigerant injection port is larger.
In some optional embodiments, to further increase the speed of adjusting the operation state of the air conditioner and effectively avoid the refrigerant from damaging the compressor of the air conditioning system, the step S102 of controlling the refrigerant storage device to adjust the amount of the refrigerant in the refrigerant circulation pipeline according to the difference Dsh includes:
when the difference Dsh is smaller than a fifth set value, determining a target recovery speed according to a difference delta Dsh1 obtained by subtracting the fifth set value from the difference Dsh; controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline according to the target recovery speed;
when the difference Dsh is larger than a sixth set value, determining a target injection speed according to a difference delta Dsh2 obtained by subtracting the sixth set value from the difference Dsh; and controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline according to the target recovery speed.
Specifically, the target recovery rate is determined according to the following formula (1):
vs3 ═ - (a × Δ Dsh1+ b) formula (1)
Wherein Vs3 is the target recovery speed, a is an adjustment coefficient of the target recovery speed, and b is a correction coefficient of the target recovery speed.
The target implant rate is determined according to the following equation (2):
vp4 ═ c × Δ Dsh1+ d formula (2)
Wherein Vp4 is the target injection velocity, a is an adjustment coefficient of the target injection velocity, and b is a correction coefficient of the target injection velocity.
In the foregoing embodiment, in order to avoid damage to the air conditioning system when the change in the degree of superheat is not found in time, the current degree of superheat Ts of the air conditioning system is obtained at set intervals. Wherein the set time is 10 min-40 min. Optionally, the set time is 10min, 15min, 20min, 25min, 30min, 35min or 40 min.
The following are embodiments of the apparatus provided by the present invention for performing the above-described method.
As shown in fig. 2, a control apparatus for an air conditioning system according to an embodiment of the present invention includes: a determination unit 201 and an adjustment unit 201.
The determining unit 201 is used for determining the difference Dsh between the current superheat Ts minus the set superheat Th of the air conditioning system.
And the adjusting unit 202 is configured to control the refrigerant storage device to adjust the amount of refrigerant in the refrigerant circulation pipeline according to the difference Dsh, so as to adjust the superheat degree of the air conditioning system and control the air conditioning system to be in an optimal operating state.
The preset superheat degree Th is preset in the air conditioning system, and in the process of adjusting the air conditioning system, whether the current superheat degree Ts of the air conditioning system meets an operation standard or not is determined by taking the preset superheat degree Th as a reference value, namely whether the air conditioning system operates in an optimal working state or not is determined.
The difference Dsh is the difference of the current superheat Ts minus the set superheat Th. According to the change of the current superheat degree Ts, the difference Dsh can be positive or negative, and the situation that the current superheat degree Ts is equal to the set superheat degree Th can also exist. When the difference Dsh is zero, the refrigerant storage device does not need to be adjusted.
The adjusting unit 202 is configured to adjust the amount of refrigerant in the refrigerant circulation pipeline through the refrigerant storage device, so as to change the heat exchange efficiency between the refrigerant and the surrounding environment, accelerate the adjusting speed of the superheat degree, and shorten the time for the air conditioner to return to the optimal operating state. In the process, the working frequency of the compressor of the air conditioning system, the rotating speed of the indoor fan and the opening degree of the expansion valve cannot be changed, the air outlet state of the air conditioner is maintained in a stable state, and discomfort to a human body cannot be caused, so that the user experience is improved. Meanwhile, liquid impact caused by liquid refrigerant flowing into the compressor in the refrigerant circulating pipeline is avoided, and the safety of the air conditioning system is improved.
The air conditioning system in the embodiment of the invention is additionally provided with the refrigerant storage device between the evaporator and the condenser, and the refrigerant storage device is controlled to change the amount of the refrigerant in the refrigerant circulation pipeline according to the difference value obtained by subtracting the set superheat degree from the superheat degree of the air conditioner so as to adjust the superheat degree of the air conditioning system and control the air conditioning system to be in the optimal running state.
In the foregoing embodiments, the adjusting unit 202 controls the refrigerant storage device to adjust the refrigerant amount in the refrigerant circulation pipeline according to the difference Dsh.
In some alternative embodiments, as shown in fig. 3, the adjusting unit 202 includes: a recovery unit 301 and an injection unit 302.
The recycling unit 301 is configured to control the refrigerant storage device to recycle the refrigerant from the refrigerant circulation pipeline when the difference Dsh is smaller than a first set value.
An injection unit 302, configured to control the refrigerant storage device to inject a refrigerant into the refrigerant circulation pipeline when the difference Dsh is greater than a second predetermined value; wherein the first set value is less than or equal to the second set value.
In some alternative embodiments, the first set point and the second set point are equal, and the first set point and the second set point are zero. In some alternative embodiments, the absolute values of the first and second set points are equal. The first set value is less than zero and the second set value is greater than zero. Along with the operation of the air conditioner, the superheat degree can be changed continuously, the difference Dsh is in the range from the first set value to the second set value, although a liquid return phenomenon exists, the risk of liquid impact caused by liquid refrigerant flowing into the compressor is very small and can be ignored.
When the difference value Dsh is smaller than the first set value, the risk of liquid slugging caused by the liquid refrigerant flowing into the compressor is increased along with the increase of the difference value between the difference value Dsh and the first set value, and when the difference value Dsh is larger than the second set value, the risk of liquid slugging caused by the liquid refrigerant flowing into the compressor is increased along with the increase of the difference value between the difference value Dsh and the second set value. In order to accelerate the adjusting speed, the adjusting speed of the refrigerant quantity in the refrigerant circulating pipeline is changed according to the difference value Dsh and the first set value or the second set value.
In some alternative embodiments, as shown in fig. 4, the recycling unit 301 includes: a first recovery subunit 3011 and a second recovery subunit 3012.
The first recovery subunit 3011 is configured to, when the difference Dsh is greater than or equal to a third set value and smaller than the first set value, control the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline at a first recovery speed Vs 1.
A second recovery subunit 3012, configured to, when the difference Dsh is smaller than the third set value, control the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline at a second recovery speed Vs 2; wherein the second recovery speed Vs2 is greater than the first recovery speed Vs 1.
Optionally, the injection unit 302 includes: a first injection subunit 3021 and a second injection subunit 3022.
The first injection subunit 3021 is configured to control the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline at a first injection speed Vp1 when the difference Dsh is greater than the second predetermined value and less than or equal to a fourth predetermined value.
A second injection subunit 3022, configured to control the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline at a second injection speed Vp2 when the difference Dsh is greater than the fourth set value; wherein the second injection velocity Vp2 is greater than the first injection velocity Vp 1.
Optionally, the refrigerant storage device includes a compressor, and is configured to recover the refrigerant from the refrigerant circulation pipeline or inject the refrigerant into the refrigerant circulation pipeline. And adjusting the working frequency of a compressor of the refrigerant storage device when the refrigerant storage device is controlled to recover the refrigerant from the refrigerant circulation pipeline at different speeds, wherein the higher the working frequency of the compressor of the refrigerant storage device is, the faster the recovery speed is. For example: when the refrigerant storage device is controlled to recover the refrigerant from the refrigerant circulation pipeline at a first recovery speed Vs1, the working frequency of a compressor of the refrigerant storage device is controlled to be 20hz, and when the refrigerant storage device is controlled to recover the refrigerant from the refrigerant circulation pipeline at a second recovery speed Vs2, the working frequency of the compressor of the refrigerant storage device is increased, and the working frequency of the compressor of the refrigerant storage device is adjusted to be 40 hz. Similarly, the working frequency of the compressor of the refrigerant storage device is adjusted when the refrigerant storage device is controlled to inject the refrigerant into the refrigerant circulation pipeline at different speeds, and the higher the working frequency of the compressor of the refrigerant storage device is, the faster the injection speed is.
In some optional embodiments, to further increase the speed of adjusting the operation state of the air conditioner and effectively prevent the refrigerant from damaging the compressor of the air conditioning system, the adjusting unit 202 includes: a first calculation unit 5011, a third recovery subunit 5012, a second calculation unit 5021 and a third injection subunit 5022.
The first calculating unit 5011 is configured to determine a target recovery speed according to a difference Δ Dsh1 obtained by subtracting a fifth set value from the difference Dsh when the difference Dsh is smaller than the fifth set value.
The third recovery subunit 5012 is configured to control the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline according to the target recovery speed.
A second calculating unit 5021, configured to determine a target injection velocity according to a difference Δ Dsh2 obtained by subtracting a sixth set value from the difference Dsh when the difference Dsh is greater than the sixth set value.
The third injection subunit 5022 controls the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline according to the target recovery speed.
Specifically, the target recovery rate is determined according to formula (1) provided in the foregoing method embodiment, and the target injection rate is determined according to formula (2) provided in the foregoing method embodiment.
In the foregoing embodiment, in order to avoid damage to the air conditioning system when the change in the degree of superheat is not found in time, the current degree of superheat Ts of the air conditioning system is obtained at set intervals. Wherein the set time is 10 min-40 min. Optionally, the set time is 10min, 15min, 20min, 25min, 30min, 35min or 40 min.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention. It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, it should be understood that the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (6)
1. A control method for an air conditioning system is characterized in that the air conditioning system comprises a refrigerant storage device arranged between an evaporator and a condenser; the method comprises the following steps:
determining a difference Dsh obtained by subtracting a set superheat Th from a current superheat Ts of the air-conditioning system;
controlling the refrigerant storage device to adjust the amount of the refrigerant in the refrigerant circulation pipeline according to the difference Dsh so as to adjust the superheat degree of the air-conditioning system and control the air-conditioning system to be in the optimal running state;
the controlling the refrigerant storage device to adjust the refrigerant quantity in the refrigerant circulation pipeline according to the difference value Dsh comprises:
when the difference Dsh is smaller than a first set value, controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulating pipeline;
when the difference Dsh is larger than a second set value, controlling the refrigerant storage device to inject a refrigerant into the refrigerant circulating pipeline; wherein the first set value is less than or equal to the second set value;
when the difference value Dsh is smaller than a first set value, controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline includes:
when the difference value Dsh is greater than or equal to a third set value and less than the first set value, controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline at a first recovery speed Vs 1;
when the difference value Dsh is smaller than the third set value, controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline at a second recovery speed Vs 2; wherein the second recovery speed Vs2 is greater than the first recovery speed Vs 1.
2. The method as claimed in claim 1, wherein the controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulation line when the difference Dsh is greater than a second set value comprises:
when the difference value Dsh is greater than the second set value and less than or equal to a fourth set value, controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline at a first injection speed Vp 1;
when the difference value Dsh is larger than the fourth set value, controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline at a second injection speed Vp 2; wherein the second injection velocity Vp2 is greater than the first injection velocity Vp 1.
3. The method as claimed in claim 1, wherein the controlling the refrigerant storage device to adjust the amount of refrigerant in the refrigerant circulation pipeline according to the difference Dsh comprises:
when the difference Dsh is smaller than a fifth set value, determining a target recovery speed according to a difference delta Dsh1 obtained by subtracting the fifth set value from the difference Dsh;
controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline according to the target recovery speed;
when the difference Dsh is larger than a sixth set value, determining a target injection speed according to a difference delta Dsh2 obtained by subtracting the sixth set value from the difference Dsh;
and controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline according to the target recovery speed.
4. A control device for an air conditioning system is characterized in that the air conditioning system comprises a refrigerant storage device arranged between an evaporator and a condenser; the device comprises:
the determining unit is used for determining a difference Dsh obtained by subtracting a set superheat Th from the current superheat Ts of the air-conditioning system;
the adjusting unit is used for controlling the refrigerant storage device to adjust the amount of the refrigerant in the refrigerant circulating pipeline according to the difference Dsh so as to adjust the superheat degree of the air-conditioning system and control the air-conditioning system to be in the optimal running state;
the adjusting unit includes:
the recovery unit is used for controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulating pipeline when the difference Dsh is smaller than a first set value;
the injection unit is used for controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulating pipeline when the difference Dsh is larger than a second set value; wherein the first set value is less than or equal to the second set value;
the recovery unit includes:
a first recovery subunit, configured to control the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline at a first recovery speed Vs1 when the difference Dsh is greater than or equal to a third setting value and smaller than the first setting value;
the second recovery subunit is configured to, when the difference Dsh is smaller than the third set value, control the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline at a second recovery speed Vs 2; wherein the second recovery speed Vs2 is greater than the first recovery speed Vs 1.
5. The control device according to claim 4, wherein the injection unit includes:
the first injection subunit is used for controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline at a first injection speed Vp1 when the difference Dsh is greater than the second set value and less than or equal to a fourth set value;
the second injection subunit is used for controlling the refrigerant storage device to inject the refrigerant into the refrigerant circulating pipeline at a second injection speed Vp2 when the difference value Dsh is greater than the fourth set value; wherein the second injection velocity Vp2 is greater than the first injection velocity Vp 1.
6. The control device according to claim 4, wherein the adjusting unit includes:
the first calculating unit is used for determining a target recovery speed according to a difference value delta Dsh1 obtained by subtracting a fifth set value from the difference value Dsh when the difference value Dsh is smaller than the fifth set value;
the third recovery subunit is used for controlling the refrigerant storage device to recover the refrigerant from the refrigerant circulation pipeline according to the target recovery speed;
the second calculating unit is used for determining the target injection speed according to the difference value Dsh2 obtained by subtracting the sixth set value from the difference value Dsh when the difference value Dsh is larger than the sixth set value;
and the third injection subunit controls the refrigerant storage device to inject the refrigerant into the refrigerant circulation pipeline according to the target recovery speed.
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Effective date of registration: 20210514 Address after: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao Applicant after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Applicant after: Haier Smart Home Co., Ltd. Address before: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao Applicant before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. |