CN117663555A - Method and device for controlling air conditioning unit, air conditioning unit and storage medium - Google Patents
Method and device for controlling air conditioning unit, air conditioning unit and storage medium Download PDFInfo
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 50
- 239000007788 liquid Substances 0.000 claims description 17
- 238000012937 correction Methods 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 description 42
- 239000000725 suspension Substances 0.000 description 15
- 239000003507 refrigerant Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 11
- 239000007789 gas Substances 0.000 description 10
- 238000004891 communication Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 241000233866 Fungi Species 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
- 238000012545 processing Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000003434 inspiratory effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The application relates to the technical field of intelligent air conditioners, and discloses a method for controlling an air conditioning unit, wherein the air conditioning unit comprises: a plurality of indoor air coolers; comprising the following steps: controlling the running rotating speed of the compressor according to the running number of the indoor air coolers; correcting the current rotating speed of the compressor according to the relevant parameters of the suction pressure of the compressor; the compressor is controlled to operate at the corrected rotational speed. The method comprises the steps of determining the running rotating speed of the compressor based on the running quantity of the indoor air cooler, and correcting the current rotating speed based on the relevant parameters of the suction pressure of the compressor. Thus, the operation speed of the compressor is in a proper range by combining the operation quantity of the indoor air cooler and the related parameters of the suction pressure when the compressor is operated, so that the possibility of surge of the compressor is reduced. And further improves the running stability of the compressor so as to ensure the normal running of the air conditioning unit. The application also discloses a device for controlling the air conditioning unit, the air conditioning unit and a storage medium.
Description
Technical Field
The present application relates to the technical field of intelligent air conditioning, for example, to a method and apparatus for controlling an air conditioning unit, and a storage medium.
Background
The compressor is the core structure of air conditioning unit, and the normal operating of compressor is the basic guarantee of air conditioning unit normal operating. However, for air-suspension direct expansion air conditioning units, the air-suspension compressor is prone to surge if the environmental load fluctuates or is a lower load.
The related art discloses a control method of a gas suspension compressor, which comprises the following steps: judging the working mode of the air suspension compressor; when the air suspension compressor is in an automatic mode, judging the magnitudes of the air suspension compressor current and the speed limiting current; when the current of the gas suspension compressor is less than the speed limiting current, judging the magnitude of the automatic set rotating speed and the surge critical rotating speed of the gas suspension compressor; when the automatic set rotating speed of the air suspension compressor is larger than the surge critical rotating speed, judging the automatic set rotating speed of the air suspension compressor and the upper limit value of the rotating speed; when the automatic set rotating speed of the air suspension compressor is smaller than the upper limit value of the rotating speed, controlling the actual rotating speed of the air suspension compressor to be the automatic set rotating speed of the air suspension compressor; wherein the surge critical rotation speed is less than the rotation speed upper limit value.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
for some special application environments, such as edible fungi culture environments, an air cooler is arranged in each culture room. That is, the air conditioning unit drives a plurality of indoor air coolers to operate. The risk of compressor surge is greater. The above control method obviously does not take this problem into consideration.
Disclosure of Invention
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, but is intended as a prelude to the more detailed description that follows.
The embodiment of the disclosure provides a method, a device, an air conditioning unit and a storage medium for controlling the air conditioning unit, so that the possibility of surging of a compressor is reduced when the air conditioning unit drives a plurality of indoor air coolers to operate.
In some embodiments, the air conditioning unit includes: a plurality of indoor air coolers; the method comprises the following steps: controlling the running rotating speed of the compressor according to the running number of the indoor air coolers; correcting the current rotating speed of the compressor according to the relevant parameters of the suction pressure of the compressor; the compressor is controlled to operate at the corrected rotational speed.
In some embodiments, the apparatus comprises: comprising a processor and a memory storing program instructions, the processor being configured to perform the aforementioned method for controlling an air conditioning unit when the program instructions are executed.
In some embodiments, the air conditioning unit includes: a plurality of indoor air coolers; further comprises: the apparatus for controlling an air conditioning unit as described above.
In some embodiments, the storage medium stores program instructions that, when executed, perform the aforementioned method for controlling an air conditioning unit.
The method, the device, the air conditioning unit and the storage medium for controlling the air conditioning unit provided by the embodiment of the disclosure can realize the following technical effects:
the running speed of the compressor is first determined based on the running number of the indoor air coolers so that the current output capacity of the compressor is matched with the actual load. And correcting the current rotating speed based on the relevant parameters of the suction pressure of the compressor, so that the corrected rotating speed of the compressor is matched with the current state of the compressor. The compressor is then controlled to operate at the corrected rotational speed. Thus, the operation speed of the compressor is in a proper range by combining the operation quantity of the indoor air cooler and the related parameters of the suction pressure when the compressor is operated, so that the possibility of surge of the compressor is reduced. And further improves the running stability of the compressor so as to ensure the normal running of the air conditioning unit.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:
fig. 1 is a schematic refrigerant cycle diagram of an air conditioning unit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a method for controlling an air conditioning unit provided by an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of suction pressure versus rotational speed increase provided by an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of another method for controlling an air conditioning unit provided by an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of another method for controlling an air conditioning unit provided by an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of an apparatus for controlling an air conditioning unit provided in an embodiment of the present disclosure;
fig. 7 is a schematic view of another apparatus for controlling an air conditioning unit provided by an embodiment of the present disclosure.
Reference numerals:
1. a frequency converter; 2. a compressor; 3. a condenser; 4. a gas-liquid separator; 5. an economizer; 6. a gas supply tank; 7. an indoor air cooler; 8. an exhaust line; 81. a first one-way valve; 9. a main liquid path; 10. an air supply line; 101. a filter; 102. a refrigerant pump; 103. a second one-way valve; 11. an air supplementing pipeline; 12. an air suction line; 13. load balancing pipelines; 131. a load balancing valve; 14. a motor cooling pipeline; 141. cooling the electronic expansion valve; 15. a branch pipe; 16. an electromagnetic valve; 17. a thermal expansion valve.
Detailed Description
So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.
The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The term "plurality" means two or more, unless otherwise indicated.
In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.
The term "corresponding" may refer to an association or binding relationship, and the correspondence between a and B refers to an association or binding relationship between a and B.
Referring to fig. 1, an embodiment of the present disclosure provides an air conditioning unit, including: a frequency converter 1, a compressor 2, a condenser 3, a gas-liquid separator 4, an economizer 5, a gas supply tank 6 and a plurality of indoor air coolers 7.
The inverter 1 is connected to the compressor 2. The output rotating speed of the frequency converter 1 is controlled, so that the running rotating speed of the compressor 2 is controlled, and the purpose of controlling the output capacity of the compressor 2 is achieved.
The discharge port of the compressor 2 communicates with the inlet of the condenser 3 via a discharge line 8. The condenser 3 is a shell-and-tube condenser 3 or an evaporative condenser 3. The compressor 2 discharges the compressed high-temperature and high-pressure gas into the condenser 3 through the first check valve 81.
The first outlet of the condenser 3 is connected to each indoor air cooler 7 via a main liquid path 9. An economizer 5 is provided in the main liquid path 9. Each indoor air cooler 7 is connected in parallel. Each indoor air cooler 7 is communicated with the gas-liquid separator 4 through a main liquid path 9. Typically, there is an indoor air cooler 7 in a room. Of course, a plurality of indoor air coolers 7 may be provided in one room.
The refrigerant liquid from the condenser 3 enters the room through the economizer 5 (if the economizer 5 is not provided, the refrigerant liquid from the condenser 3 directly enters the room). After being split by the branch pipe 15, the refrigerant liquid passes through the electromagnetic valve 16 and then is depressurized by the thermal expansion valve 17, and enters the indoor air cooler 7 in different rooms to cool the indoor. The evaporated gases are collected and enter a gas-liquid separator 4.
The second outlet of the condenser 3 is connected to the air supply port of the compressor 2 through an air supply line 10 to supply air to the bearings of the compressor 2. The air supply pipe 10 is provided with an air supply tank 6.
The third outlet of the condenser 3 communicates with the compressor 2 through a make-up line 11 to make up air to the interior of the compressor 2. The economizer 5 is also provided on the make-up line 11.
The gas-liquid separator 4 communicates with the suction port of the compressor 2 through a suction line 12. The superheated low-temperature low-pressure gas in the gas-liquid separator 4 enters the compressor 2 through the suction line 12.
The condenser 3 is in communication with the gas-liquid separator 4 via a load balancing line 13. The load balancing pipeline 13 is provided with a load balancing valve 131 for reducing the pressure ratio in the system, thereby assisting in starting and stopping the compressor 2.
The fourth outlet of the condenser 3 is connected to the interior of the compressor 2 via a motor cooling line 14. The refrigerant flowing out of the condenser 3 enters a motor cooling pipeline 14 and passes through a cooling electronic expansion valve 141 to enter the inner cavity of the compressor 2 for cooling. The opening of the cooling electronic expansion valve 141 is regulated by PID to ensure that the motor temperature of the compressor 2 is within a reasonable interval.
The fourth outlet of the condenser 3 is also in communication with the air supply port of the compressor 2 via an air supply line 10. The air supply pipe 10 is provided with an air supply tank 6. The air supply tank 6 is provided with an electric heating and liquid level meter, when the air conditioner unit is started, the refrigerant is pumped into the air supply tank 6 through the refrigerant pump 102, and the liquid level of the air supply tank 6 is controlled to be between the upper limit and the lower limit (between 50mm and 150 mm). The pressure in the gas supply tank 6 is controlled by the electric heating switch to be maintained between the upper and lower limits of the gas supply pressure difference (between the pressure difference range 530-580 kPa). The air supply pipeline 10 is provided with a filter 101, a refrigerant pump 102, a refrigerant pump electromagnetic valve (and the refrigerant pump 102 are started and stopped simultaneously) and a second one-way valve 103. Differential air supply = pressure of air supply tank 6-bearing exhaust pressure.
The target pressure of the compressor 2 is set by the touch screen. By controlling the suction pressure, the evaporation pressure of the indoor air cooler 7 is controlled. The energy is regulated according to the suction pressure, so as to achieve the aim of reducing the indoor temperature to the required temperature.
The controller of each indoor air cooler 7 is communicated with and interacted with a host computer of the air conditioning unit. By means of information interaction, it can be determined how many rooms are running the indoor air cooler 7.
As shown in conjunction with fig. 2, an embodiment of the present disclosure provides a method for controlling an air conditioning unit, including:
s201, controlling the running rotating speed of the compressor according to the running number of the indoor air coolers by the air conditioning unit.
S202, the air conditioning unit corrects the current rotating speed of the compressor according to the relevant parameters of the suction pressure of the compressor.
S203, the air conditioning unit controls the compressor to run at the corrected rotation speed.
As can be seen from the foregoing, in some special application environments, such as edible fungi cultivation environments, one or more air coolers are provided in each cultivation room. Therefore, when the air conditioning unit starts to operate, the operation rotating speed of the compressor is determined according to the operation quantity of the indoor air coolers, so that the current output capacity of the compressor is matched with the operation quantity of the indoor air coolers. The determined running rotating speed is the highest rotating speed matched with the number of the air coolers running currently. The compressor is then controlled to operate at the determined operating speed. And in the running process of the air conditioning unit, acquiring the relevant parameters of the suction pressure of the compressor in real time through the sensor. The operating speed of the compressor is modified based on the suction pressure related parameter. The compressor is then controlled to operate at the corrected rotational speed.
In the embodiment of the disclosure, the operation rotation speed of the compressor is first determined based on the operation number of the indoor air coolers so as to match the current output capacity of the compressor with the actual load. And correcting the running rotating speed based on the relevant parameters of the suction pressure of the compressor, so that the corrected rotating speed of the compressor is matched with the current state of the compressor. The compressor is then controlled to operate at the corrected rotational speed. Thus, the operation speed of the compressor is in a proper range by combining the operation quantity of the indoor air cooler and the related parameters of the suction pressure when the compressor is operated, so that the possibility of surge of the compressor is reduced. And further improves the running stability of the compressor so as to ensure the normal running of the air conditioning unit.
Optionally, in step S201, the air conditioning unit controls the operation rotation speed of the compressor according to the operation number of the indoor air coolers, including:
the air conditioning unit obtains the highest rotational speed of the compressor.
The air conditioning unit calculates the duty ratio of the running number of the indoor air cooler.
And the air conditioning unit controls the running rotating speed of the compressor according to the highest rotating speed and the duty ratio of the running number of the indoor air coolers.
The total number N of the indoor air coolers and the maximum allowable rotating speed Vm when the compressors drive the N indoor air coolers to operate are stored in the air conditioning unit in advance. And obtaining the highest rotating speed Vm and the total number N of the indoor air coolers. The running number n of the indoor air coolers can be determined by processing the opening signals of the indoor air coolers. And calculating the ratio of the running number to the total number of the indoor air coolers, and further obtaining the ratio of the running number of the indoor air coolers to N/N which is 100%. And determining the operation rotating speed of the compressor according to the highest rotating speed and the duty ratio of the operation quantity of the indoor air coolers, and controlling the compressor to operate at the determined operation rotating speed.
Specifically, the output speed of the frequency converter is regulated to be in the range of 0-Vm, and the corresponding rotation speed percentage of the compressor is set to be 0-100%, wherein the output speed and the rotation speed are in a linear relation. I.e. 1% of the frequency converter rotation speed, represents 1% of the highest compressor rotation speed Vm. The operation rotation speed Vc of the compressor is related to the number of indoor air coolers (corresponding to the number of operation rooms if one indoor air cooler is provided in one room). Setting: if N indoor air coolers are running, the highest rotating speed to which the compressor is allowed to be loaded is 100% vm. If n indoor air coolers are operated, the highest operation rotating speed of n rooms is as follows: N/N is 100% vm. For example: the full-load operation of the air conditioner set can be carried out with 10 indoor air coolers, but only 5 indoor air coolers are operated at present, and the current highest allowable operation rotating speed of the compressor is 50% vm. The current highest allowable operating speed is determined as the operating speed of the compressor. Therefore, the running rotation speed of the compressor is limited by the running number of the indoor air coolers, and the aim of preliminary surge prevention is achieved.
Optionally, the inhalation pressure-related parameter comprises: suction pressure. Step S202, the air conditioning unit corrects the current rotation speed of the compressor according to the suction pressure related parameter of the compressor, including:
and the air conditioning unit determines the rotation speed increment according to the suction pressure.
And the air conditioning unit corrects the current rotation speed of the compressor once according to the rotation speed increment.
The suction pressure related parameters of the compressor include: suction pressure P Suction pipe . The rotational speed increase is determined from the suction pressure. Specifically, fig. 3 shows the relationship between suction pressure and rotational speed increase. Suction pressure represents the load and unload condition of the compressor. When the suction pressure is within the positive dead zone and the negative dead zone, indicating that the current suction pressure is within the target pressure range, no load shedding is necessary. As long as the suction pressure is not in the positive and negative dead zones, the air conditioning unit can be loaded and unloaded according to the suction pressure. Wherein, add and subtract the load district and include: a fast unload region, a fast load region, and a linear computation region.
If P Suction pipe <And P1, the rotation speed increment is a first increment. The suction pressure is now in the rapid unloading zone, the first increment being negative. Alternatively, the first increment may be-1%.
If P1 is less than or equal to P Suction pipe <P2, the rotation speed increment is proportional to the current suction pressure, i.e. increases with increasing current suction pressure. The suction pressure is now in the linear calculation region.
If P2 is less than or equal to P Suction pipe And the rotation speed increment is 0 if the rotation speed increment is less than or equal to P3. The suction pressure is now in the positive and negative dead zones.
If P3<P Suction pipe And less than or equal to P4, the rotation speed increment is proportional to the current inhalation pressure, namely, increases along with the increase of the current inhalation pressure. The suction pressure is now in the linear calculation region.
If P4<P Suction pipe The rotation speed increment is a second increment. At this point the suction pressure is in the rapid loading zone and the second increment is positive. Optionally, the second increment is 1%.
Wherein P1 is a first pressure threshold and is a negative value. P2 is the second pressure threshold and is negative. P3 is a third pressure threshold, positive. P4 is the fourth pressure threshold and is positive.
Note that, P1, P2, P3, P4, the first increment and the second increment may be adjusted according to actual needs, and the embodiment is not limited specifically.
After the rotation speed increment is determined according to the scheme, the current rotation speed of the compressor is corrected once according to the rotation speed increment.
Specifically, the rotation speed after one correction is calculated by the formula (1):
V′＝V c +X*V c (1)
wherein V' is the rotation speed after one-time correction, X is the rotation speed increment, V c The running rotating speed of the compressor is determined according to the running quantity of the indoor air cooler.
Thus, based on the suction pressure, a rotation speed increment matched with the suction pressure is determined, and then the operation rotation speed V of the compressor is further increased c And (5) performing correction. So that the compressor rotatesThe velocity is matched to the suction pressure.
Optionally, the inhalation pressure-related parameter comprises: inhalation pressure and inhalation pressure rate of change. Step S202, the air conditioning unit corrects the current rotation speed of the compressor according to the suction pressure related parameter of the compressor, including:
and the air conditioning unit determines the rotation speed increment according to the suction pressure.
And the air conditioning unit corrects the current rotation speed of the compressor once according to the rotation speed increment.
The air conditioning unit carries out secondary correction on the basis of primary correction of the current rotating speed according to the change rate of the suction pressure.
First, the rotational speed after one correction is calculated according to the scheme described above. During the course of the suction pressure change, if the suction pressure drops very rapidly or rises very rapidly, a corresponding adjustment of the compressor speed is also required.
Firstly, calculating the change rate of the suction pressure through a formula (2):
ΔP＝P T /ΔT (2)
wherein ΔP is the rate of change of the suction pressure, ΔT is the duration, P T Is the amount of change in inspiratory pressure over a period deltat. Alternatively, deltaT is 1 to 60s, for example a value of 10s.
And then calculating the rotation speed after the secondary correction through a formula (3):
V″＝V c +X*V c (1+N*ΔP) (3)
wherein V' is the rotation speed after the secondary correction, and N is the weight coefficient. Alternatively, N is 0.01 to 2, for example, a value of 0.2.
In this way, the compressor rotation speed is corrected based on the suction pressure, and the compressor rotation speed is further corrected based on the suction pressure change rate. The compressor speed is matched to the suction pressure related parameter to further reduce the likelihood of compressor surge.
As shown in connection with fig. 4, an embodiment of the present disclosure provides another method for controlling an air conditioning unit, including:
s201, controlling the running rotating speed of the compressor according to the running number of the indoor air coolers by the air conditioning unit.
S202, the air conditioning unit corrects the current rotating speed of the compressor according to the relevant parameters of the suction pressure of the compressor.
S203, the air conditioning unit controls the compressor to run at the corrected rotation speed.
S204, under the condition that the air conditioning unit determines that one or more indoor air coolers need to be stopped, determining the target rotating speed of the compressor according to the stopping number of the indoor air coolers.
S205, controlling the rotating speed of the compressor according to the target rotating speed within a preset time period by the air conditioning unit.
S206, after the air conditioning unit is in a preset time period, controlling the corresponding indoor air cooler to stop.
In the running process of the air conditioning unit, when the temperature of a certain room reaches the set temperature of the room, the indoor air cooler of the room needs to be closed. The indoor air cooler sends a signal to a host of the air conditioning unit to inform the host that the indoor air cooler needs to be shut down. The host computer can determine the number of indoor air cooler stalls and which indoor air coolers stall. At the first preset time length T of receiving the stop signal 1 And then, the host controls the corresponding indoor air cooler to stop. That is, when the room temperature reaches the preset temperature, the corresponding indoor air cooler is not immediately controlled to stop. And controlling the corresponding indoor air cooler to stop for a first preset time. This is because the rotational speed of the compressor needs to be changed for an extended first preset period of time to avoid the problem of surge of the compressor caused by sudden shut down of the indoor air cooler. Optionally, the first preset duration is 5-60 s, and the value is generally 10s.
And determining the target rotating speed of the compressor according to the number of the indoor air coolers to stop within a first preset time length of time delay stop. Specifically, the target rotation speed is calculated by the formula (5):
V″′＝[(n-m)/n]*[V c +X*V c (1+N*ΔP)] (5)
wherein V' "is the target rotating speed, n is the running number of the indoor air cooler, and m is the number of the indoor air cooler which is stopped.
For example, the initial number of indoor air cooler runs is 6, and the host receives a signal indicating that 1 indoor air cooler is required to be shut down. Then, within a first preset duration of the delayed shutdown, determining a target rotation speed V' "=5/6 x [ V ] of the compressor c +X*V c (1+N*ΔP)]。
Meanwhile, the rotation speed of the compressor is limited by the minimum rotation speed and the maximum rotation speed, so that the rotation speed of the compressor needs to be further controlled according to the calculated target rotation speed. In this way, the target rotation speed of the compressor is matched with the reduction condition of the indoor air cooler and the capacity of the compressor.
After the indoor air cooler is controlled to stop, the corresponding electromagnetic valve is controlled to be disconnected.
Optionally, in step S205, the air conditioning unit controls the rotation speed of the compressor according to the target rotation speed, including:
and S215, controlling the compressor to run at the target rotating speed under the condition that the target rotating speed is smaller than the current allowable loading maximum rotating speed and is larger than the preset rotating speed.
And S225, controlling the compressor to run at the preset rotating speed under the condition that the target rotating speed of the air conditioning unit is smaller than the preset rotating speed.
When the indoor air cooler is stopped, the current allowable loading maximum rotating speed of the compressor is also reduced. Specifically [ (n-m)/n]*V m 。
And if the target rotating speed is greater than or equal to the current allowable loading maximum rotating speed, controlling the compressor to operate at the current allowable loading maximum rotating speed.
And if the target rotating speed is smaller than the current allowable loading maximum rotating speed and is larger than the preset rotating speed, controlling the compressor to operate at the target rotating speed.
And if the target rotating speed is smaller than the preset rotating speed, controlling the compressor to operate at the preset rotating speed. The preset rotational speed is the allowable minimum rotational speed, and is also the surge rotational speed. If the compressor is operating below a preset rotational speed, the compressor may surge.
In this way, the operating speed of the compressor is controlled based on the target speed, the current allowable loading maximum speed, and the preset speed, so as to avoid surging of the compressor as much as possible.
According to the scheme, the scheme for assigning the rotation speed of the compressor is provided based on the running number of the indoor air cooler, the air suction pressure change rate and the shutdown number of the indoor air cooler. Not only can solve the problem that the air suspension compressor is easy to surge, but also lays a foundation for the air suspension compressor to enter the fields of edible fungus cultivation, refrigeration houses and the like in cooperation with an air cooler refrigeration mode.
As shown in conjunction with fig. 5, an embodiment of the present disclosure provides another method for controlling an air conditioning unit, including:
s201, controlling the running rotating speed of the compressor according to the running number of the indoor air coolers by the air conditioning unit.
S202, the air conditioning unit corrects the current rotating speed of the compressor according to the relevant parameters of the suction pressure of the compressor.
S203, the air conditioning unit controls the compressor to run at the corrected rotation speed.
S204, under the condition that the air conditioning unit determines that one or more indoor air coolers need to be stopped, determining the target rotating speed of the compressor according to the stopping number of the indoor air coolers.
S225, controlling the compressor to run at the preset rotating speed when the air conditioning unit is in the preset time and the target rotating speed is smaller than the preset rotating speed.
S206, after the air conditioning unit is in a preset time period, controlling the corresponding indoor air cooler to stop.
S207, the air conditioning unit controls the load balance valve to be opened.
S208, the air conditioning unit controls the opening degree of the load balancing valve according to the operation parameters of the compressor.
From the foregoing, it can be seen that when the number of indoor air coolers is reduced, the compressor is controlled to operate optimally at the target rotational speed calculated based on the number of stops. But the rotational speed of the compressor cannot be infinitely reduced. Therefore, when the target rotational speed is less than the preset rotational speed, the operation is performed only at the preset rotational speed. In this case, the load balancing valve is controlled to be opened to the initial opening Y, and pressure relief is performed through the load balancing line. Thereby reducing the pressure ratio and supplementing the amount of suction required by the compressor to prevent compressor surge.
For example: there is still 1 indoor air cooler running, and at this time it is desirable to limit the compressor load to 10%. However, since the surge speed may be 30%, the intake of 1 indoor air cooler is obviously less than 30%. The compressor load can no longer be reduced and the compressor will surge. To prevent surge, the load balancing valve needs to be opened. After the load balancing valve is opened, the system pressure ratio may decrease, and the surge speed of the compressor may decrease to 25%. And 15% worse, the load balancing valve will compensate for this required amount of suction. Thus, the compressor can remain operational, but not surge. But the suction pressure will rise after the load balancing valve opens. The compressor speed cannot be calculated using the above formula. Instead, the compressor speed is made equal to a preset speed (surge speed) so that the compressor speed is always the lowest state. The load is then regulated using a load balancing valve.
And controlling the opening degree of the balance load valve according to the operation parameters of the compressor. The current suction pressure P of the compressor is obtained through pressure sensors arranged on a suction pipeline and an exhaust pipeline Suction pipe And exhaust pressure P Row of rows 。
Judging P Suction pipe And P Row of rows Whether a first preset condition is satisfied: p (P) Is provided with ≤P Suction pipe <P Is provided with +ΔP, and P Single sheet <P Row of rows . Wherein P is Single sheet Is the pressure of the refrigerant after flowing through the first one-way valve. If so, the load balancing valve is controlled to maintain the initial opening Y, indicating that the suction pressure and discharge pressure of the compressor are appropriate. If not, further judging P Suction pipe And P Row of rows Whether a second preset condition is satisfied: p (P) Suction pipe <P Is provided with And P is Single sheet <P Row of rows . If so, the opening degree of the load balancing valve is controlled to be increased by C%. If not, the opening degree of the load balancing valve is controlled to be reduced by D%. After the opening degree of the load balancing valve is regulated through the scheme, a second preset time length T is passed 2 Re-judging P Suction pipe And P Row of rows Whether the first preset condition is met or not, and continuing according to the schemeAnd adjusting the opening degree of the load balancing valve. In this way, the opening degree of the load balancing valve is adjusted based on the suction pressure and the discharge pressure to prevent the compressor from surging.
Optionally, Y, delta P, A, B, T is determined from the pressure ratio r 2 Specific values of (2). The pressure ratio and the parameters have an association relation, and the association relation comprises one or more r, Y and delta P, A, B, T 2 Corresponding relation of (3). Specific correspondence can be seen in table 1.
Table 1 r and Y, delta P, C, D, T 2 Is related to the relationship of (a)
Wherein r, X, delta P, A, B, T 2 Positive correlation is established. r is (r) 1 <r 2 <r 3 <…<r n ，Y 1 <Y 2 <Y 3 <…<Y n ，ΔP 1 <ΔP 2 <ΔP 3 <…<ΔP n ，A 1 <A 2 <A 3 <…<A n ，B 1 <B 2 <B 3 <…<B n ，T 21 <T 22 <T 23 <…<T 2n 。
During the time that the load balancing valve is open, the rotational speed of the compressor is still calculated by the above equation (5). And if the calculated rotating speed is greater than the surge rotating speed, closing the load balancing valve. Meanwhile, if the calculated rotation speed is smaller than the maximum rotation speed which is allowed to be loaded currently, the compressor is controlled to operate at the calculated rotation speed. And if the calculated rotating speed is greater than or equal to the maximum rotating speed which is allowed to be loaded currently, controlling the compressor to operate at the maximum rotating speed which is allowed to be loaded currently.
The scheme is not only suitable for the condition that the air conditioning unit is provided with one compressor, but also suitable for the condition that the air conditioning unit is provided with a plurality of compressors.
As shown in connection with fig. 6, an embodiment of the present disclosure provides an apparatus for controlling an air conditioning unit, including: a determination module 61, a correction module 62 and a control module 63. The determining module 61 is configured to control an operation speed of the compressor according to an operation number of the indoor air coolers. The correction module 62 is configured to correct the current rotational speed of the compressor based on the suction pressure related parameter of the compressor. The control module 63 is configured to control the compressor to operate at the corrected rotational speed.
By adopting the device for controlling the air conditioning unit, which is provided by the embodiment of the disclosure, the running rotating speed of the compressor is firstly determined based on the running quantity of the indoor air cooler, so that the current output capacity of the compressor is matched with the actual load. And correcting the current rotating speed based on the relevant parameters of the suction pressure of the compressor, so that the corrected rotating speed of the compressor is matched with the current state of the compressor. The compressor is then controlled to operate at the corrected rotational speed. Thus, the operation speed of the compressor is in a proper range by combining the operation quantity of the indoor air cooler and the related parameters of the suction pressure when the compressor is operated, so that the possibility of surge of the compressor is reduced. And further improves the running stability of the compressor so as to ensure the normal running of the air conditioning unit.
As shown in connection with fig. 7, an embodiment of the present disclosure provides an apparatus for controlling an air conditioning unit, including a processor (processor) 70 and a memory (memory) 71. Optionally, the apparatus may also include a communication interface (Communication Interface) 72 and a bus 73. The processor 70, the communication interface 72 and the memory 71 may communicate with each other via a bus 73. The communication interface 72 may be used for information transfer. The processor 70 may invoke logic instructions in the memory 71 to perform the method for controlling an air conditioning unit of the above-described embodiments.
Further, the logic instructions in the memory 71 described above may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand alone product.
The memory 71 is a computer-readable storage medium that can be used to store a software program, a computer-executable program, and program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 70 performs functional applications and data processing by executing program instructions/modules stored in the memory 71, i.e., implements the method for controlling an air conditioning unit in the above-described embodiment.
The memory 71 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the terminal device, etc. In addition, the memory 71 may include a high-speed random access memory, and may also include a nonvolatile memory.
The embodiment of the disclosure provides an air conditioning unit, which comprises the device for controlling the air conditioning unit.
Embodiments of the present disclosure provide a storage medium storing computer-executable instructions configured to perform the above-described method for controlling an air conditioning unit.
The storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.
The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only 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. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, when used in this application, the terms "comprises," "comprising," and/or "includes," and variations thereof, mean that the stated features, integers, steps, operations, elements, and/or components are present, but that the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.
Those of 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 solution. The skilled artisan may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units may be merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than that disclosed in the description, and sometimes no specific order exists between different operations or steps. For example, two consecutive operations or steps may actually be performed substantially in parallel, they may sometimes be performed in reverse order, which may be dependent on the functions involved. Each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (10)
1. A method for controlling an air conditioning unit, the air conditioning unit comprising: a plurality of indoor air coolers; characterized by comprising the following steps:
controlling the running rotating speed of the compressor according to the running number of the indoor air coolers;
correcting the current rotating speed of the compressor according to the relevant parameters of the suction pressure of the compressor;
the compressor is controlled to operate at the corrected rotational speed.
2. The method of claim 1, wherein controlling the operation speed of the compressor according to the operation number of the indoor air cooler comprises:
obtaining the highest rotating speed of a compressor;
calculating the duty ratio of the running number of the indoor air cooler;
and controlling the running rotating speed of the compressor according to the highest rotating speed and the duty ratio of the running quantity of the indoor air coolers.
3. The method of claim 1, wherein the inhalation pressure-related parameter comprises: suction pressure; the correcting the current rotation speed of the compressor according to the relevant parameters of the suction pressure of the compressor comprises the following steps:
determining a rotation speed increment according to the suction pressure;
and correcting the current rotation speed of the compressor once according to the rotation speed increment.
4. A method according to claim 3, wherein the inhalation pressure-related parameter further comprises: rate of change of suction pressure; the method for correcting the current rotating speed of the compressor according to the relevant parameters of the suction pressure of the compressor further comprises the following steps:
and carrying out secondary correction on the basis of the primary correction of the current rotating speed according to the change rate of the suction pressure.
5. A method according to claim 3, wherein after said correcting the current rotational speed of the compressor in accordance with the suction pressure related parameter of the compressor, the method further comprises:
under the condition that one or more indoor air coolers are required to be stopped, determining the target rotating speed of the compressor according to the number of the indoor air coolers;
controlling the rotation speed of the compressor according to the target rotation speed within a preset time length;
and after the preset time length, controlling the corresponding indoor air cooler to stop.
6. The method of claim 5, wherein controlling the rotational speed of the compressor based on the target rotational speed comprises:
when the target rotating speed is smaller than the current allowable loading maximum rotating speed and is larger than the preset rotating speed, controlling the compressor to operate at the target rotating speed;
and controlling the compressor to run at the preset rotating speed under the condition that the target rotating speed is smaller than the preset rotating speed.
7. The method of claim 6, wherein the air conditioning unit further comprises: the condenser is communicated with the gas-liquid separator through a load balancing pipeline; the load balancing pipeline is provided with a load balancing valve; in the case where the control compressor is operated at a preset rotational speed, the method further includes:
controlling the load balancing valve to be opened;
and controlling the opening degree of the load balancing valve according to the operation parameters of the compressor.
8. An apparatus for controlling an air conditioning unit comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for controlling an air conditioning unit according to any of claims 1 to 7 when the program instructions are run.
9. An air conditioning unit comprising: a plurality of indoor air coolers; characterized by further comprising: the apparatus for controlling an air conditioning unit as set forth in claim 8.
10. A storage medium storing program instructions which, when executed, perform the method for controlling an air conditioning unit according to any one of claims 1 to 7.
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| CN202211032808.9A CN117663555A (en) | 2022-08-26 | 2022-08-26 | Method and device for controlling air conditioning unit, air conditioning unit and storage medium |
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| CN202211032808.9A CN117663555A (en) | 2022-08-26 | 2022-08-26 | Method and device for controlling air conditioning unit, air conditioning unit and storage medium |
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