CN109357453B - Method and device for judging variable capacity switching of variable capacity compressor and control device - Google Patents
Method and device for judging variable capacity switching of variable capacity compressor and control device Download PDFInfo
- Publication number
- CN109357453B CN109357453B CN201811219728.8A CN201811219728A CN109357453B CN 109357453 B CN109357453 B CN 109357453B CN 201811219728 A CN201811219728 A CN 201811219728A CN 109357453 B CN109357453 B CN 109357453B
- Authority
- CN
- China
- Prior art keywords
- flow rate
- refrigerant flow
- refrigerant
- change rate
- switching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000003507 refrigerant Substances 0.000 claims abstract description 374
- 230000008859 change Effects 0.000 claims abstract description 156
- 230000006835 compression Effects 0.000 claims abstract description 90
- 238000007906 compression Methods 0.000 claims abstract description 90
- 230000007246 mechanism Effects 0.000 claims abstract description 79
- 230000009471 action Effects 0.000 claims abstract description 71
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 238000004378 air conditioning Methods 0.000 claims abstract description 9
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention provides a method and a device for judging variable capacity switching of a variable capacity compressor, a control device, the variable capacity compressor, an air conditioning unit and a storage medium, and relates to the technical field of compressors, wherein the method comprises the following steps: acquiring a first refrigerant flow rate change rate based on a first refrigerant flow rate and a second refrigerant flow rate which are acquired before and after the switching mechanism executes the switching action of the compression cylinder by a refrigerant flow rate detection device arranged on a refrigerant pipeline; and judging whether the switching mechanism successfully executes the compression cylinder switching action or not according to a preset switching success judgment rule and the first refrigerant flow speed change rate. The method, the device, the control device, the variable volume compressor, the air conditioning unit and the storage medium can accurately judge whether the switching mechanism successfully executes the compression cylinder switching action, can effectively control the operation of a single cylinder, multiple cylinders and the like of the variable volume compressor, enables the variable volume compressor to operate in an optimal state, and can improve the competitiveness of products and the use sensitivity of customers.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a method and a device for judging variable capacity switching of a variable capacity compressor, a control device, the variable capacity compressor, an air conditioning unit and a storage medium.
Background
The variable capacity compressor can increase the compressor capacity when the load is large, and can reduce the compressor capacity under the low load condition. When the variable-capacity compressor operates in a single cylinder, the rotor rotates in an eccentric way, so that the compressor has the advantages of large vibration, large noise, short service life and low reliability; when the variable-capacity compressor operates in double cylinders, if the variable-capacity compressor is a large-cylinder compressor and a small-cylinder compressor, the compressor shakes greatly. The variable-capacity large-cylinder and small-cylinder compressors run in a single cylinder or a double cylinder, the displacement of the compressors and the efficiency of the motors are different, the lubrication system is controlled to be different, the single cylinder and the double cylinder need to be controlled to run respectively so as to achieve the optimal use mode of the compressor, and therefore whether the variable-capacity compressor executes the compression cylinder switching action is successful needs to be determined, but the technical scheme that whether the compression cylinder switching action is successful is not judged at present.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method and an apparatus for determining variable capacity switching of a variable capacity compressor, a control apparatus, a variable capacity compressor, an air conditioning unit, and a storage medium, which are capable of obtaining a refrigerant flow rate change rate based on refrigerant flow rates collected before and after a switching mechanism performs a compression cylinder switching operation, and determining whether the compression cylinder switching operation is successfully performed according to the refrigerant flow rate change rate.
According to an aspect of the present invention, there is provided a method for determining a capacity change of a variable capacity compressor, including: the method comprises the steps that a first refrigerant flow rate collected by a refrigerant flow rate detection device arranged on a refrigerant pipeline before a compression cylinder switching action is executed by a switching mechanism and a second refrigerant flow rate collected after the compression cylinder switching action is executed by the switching mechanism are obtained; obtaining a first refrigerant flow rate change rate based on the first refrigerant flow rate and the second refrigerant flow rate; and judging whether the switching mechanism successfully executes the switching action of the compression cylinder or not according to a preset switching success judgment rule and the first refrigerant flow speed change rate.
Optionally, the determining, according to a preset switching success determination rule and the first refrigerant flow rate change rate, whether the switching mechanism successfully performs the compression cylinder switching operation includes: obtaining a first rate of change threshold; and comparing the first refrigerant flow rate change rate with the first change rate threshold, and judging whether the switching mechanism successfully executes the compression cylinder switching action or not based on the comparison result.
Optionally, the determining, based on the comparison result, whether the switching mechanism successfully performs the compression cylinder switching action includes: if the change rate of the first refrigerant flow velocity is greater than or equal to the first change rate threshold value, determining that the switching mechanism successfully executes the compression cylinder switching action; and if the change rate of the first refrigerant flow rate is smaller than the first change rate threshold value, determining that the switching mechanism fails to execute the compression cylinder switching action.
Optionally, the obtaining a first refrigerant flow rate collected by the refrigerant flow rate detection device disposed on the refrigerant pipeline before the switching mechanism performs the compression cylinder switching operation, and a second refrigerant flow rate collected after the switching mechanism performs the compression cylinder switching operation includes: when the switching mechanism is determined to need to execute the compression cylinder switching action, judging whether the refrigerant flow rate in the refrigerant pipeline is stable, and if so, obtaining the first refrigerant flow rate; and after the switching mechanism executes the switching action of the compression cylinder, obtaining the second refrigerant flow rate after a preset first time.
Optionally, the determining whether the flow rate of the refrigerant in the refrigerant pipeline is stable includes: acquiring a third refrigerant flow rate and a fourth refrigerant flow rate acquired by the refrigerant flow rate detection device at a preset interval for a second time; obtaining a second refrigerant flow rate change rate based on the third refrigerant flow rate and the fourth refrigerant flow rate; and judging whether the flow rate of the refrigerant in the refrigerant pipeline is stable or not according to a preset flow rate stability judgment rule and the second refrigerant flow rate change rate.
Optionally, the determining whether the refrigerant flow rate in the refrigerant pipeline is stable according to a preset flow rate stability determination rule and the second refrigerant flow rate change rate includes: obtaining a second rate of change threshold; and comparing the second refrigerant flow rate change rate with the second change rate threshold, and judging whether the refrigerant flow rate in the refrigerant pipeline is stable or not based on the comparison result.
Optionally, the determining whether the flow rate of the refrigerant in the refrigerant pipeline is stable based on the comparison result includes: if the second refrigerant flow rate change rate is larger than the second change rate threshold value, determining that the refrigerant flow rate in the refrigerant pipeline is unstable; and if the second refrigerant flow rate change rate is smaller than or equal to the second change rate threshold value, determining that the refrigerant flow rate in the refrigerant pipeline is stable.
Optionally, the obtaining a second refrigerant flow rate change rate based on the third refrigerant flow rate and the fourth refrigerant flow rate includes: and obtaining an absolute value of the difference between the fourth refrigerant flow rate and the third refrigerant flow rate, and taking the ratio of the absolute value to the second time length as the second refrigerant flow rate change rate.
Optionally, if it is determined that the refrigerant flow rate in the refrigerant pipeline is not stable, an alarm message is sent.
Optionally, the refrigerant pipeline includes: the inlet pipeline of the variable volume compressor and the outlet pipeline of the variable volume compressor.
Optionally, the obtaining a first refrigerant flow rate change rate based on the first refrigerant flow rate and the second refrigerant flow rate includes: and obtaining an absolute value of the difference between the first refrigerant flow velocity and the second refrigerant flow velocity, and taking the ratio of the absolute value to the first time length as the first refrigerant flow velocity change rate.
According to another aspect of the present invention, there is provided a device for determining a capacity change of a variable capacity compressor, comprising: the refrigerant flow rate acquisition module is used for acquiring a first refrigerant flow rate acquired by a refrigerant flow rate detection device arranged on a refrigerant pipeline before the switching mechanism executes the compression cylinder switching action and a second refrigerant flow rate acquired after the switching mechanism executes the compression cylinder switching action; the change rate obtaining module is used for obtaining a first refrigerant flow rate change rate based on the first refrigerant flow rate and the second refrigerant flow rate; and the switching operation judging module is used for judging whether the switching mechanism successfully executes the switching action of the compression cylinder according to a preset switching success judging rule and the first refrigerant flow rate change rate.
Optionally, the switching operation determining module is configured to obtain a first change rate threshold; and comparing the first refrigerant flow rate change rate with the first change rate threshold, and judging whether the switching mechanism successfully executes the compression cylinder switching action or not based on the comparison result.
Optionally, the switching operation determining module is configured to determine that the switching mechanism successfully performs the compression cylinder switching action if the first refrigerant flow rate change rate is greater than or equal to the first change rate threshold; and if the change rate of the first refrigerant flow rate is smaller than the first change rate threshold value, determining that the switching mechanism fails to execute the compression cylinder switching action.
Optionally, the refrigerant flow rate obtaining module includes: the state judgment unit is used for judging whether the flow rate of the refrigerant in the refrigerant pipeline is stable or not when the switching mechanism needs to execute the switching action of the compression cylinder; the flow rate obtaining unit is used for obtaining the first refrigerant flow rate if the refrigerant flow rate in the refrigerant pipeline is stable; and after the switching mechanism executes the switching action of the compression cylinder, obtaining the second refrigerant flow rate after a preset first time.
Optionally, the state determination unit is configured to obtain a third refrigerant flow rate and a fourth refrigerant flow rate, which are acquired by the refrigerant flow rate detection device at a preset interval for a second time period; obtaining a second refrigerant flow rate change rate based on the third refrigerant flow rate and the fourth refrigerant flow rate; and judging whether the flow rate of the refrigerant in the refrigerant pipeline is stable or not according to a preset flow rate stability judgment rule and the second refrigerant flow rate change rate.
Optionally, the state determining unit is configured to obtain a second change rate threshold; and comparing the second refrigerant flow rate change rate with the second change rate threshold, and judging whether the refrigerant flow rate in the refrigerant pipeline is stable or not based on the comparison result.
Optionally, the state determination unit is further configured to determine that the refrigerant flow rate in the refrigerant pipeline is unstable if the second refrigerant flow rate change rate is greater than the second change rate threshold; and if the second refrigerant flow rate change rate is smaller than or equal to the second change rate threshold value, determining that the refrigerant flow rate in the refrigerant pipeline is stable.
Optionally, the state determination unit is configured to obtain an absolute value of a difference between the fourth refrigerant flow rate and the third refrigerant flow rate, and use a ratio of the absolute value to the second time period as the second refrigerant flow rate change rate.
Optionally, the refrigerant flow rate obtaining module includes: and the alarm unit is used for sending an alarm message if the flow rate of the refrigerant in the refrigerant pipeline is determined to be unstable.
Optionally, the change rate obtaining module is configured to obtain an absolute value of a difference between the first refrigerant flow rate and the second refrigerant flow rate, and use a ratio of the absolute value to the first time period as the first refrigerant flow rate change rate.
Optionally, the refrigerant pipeline includes: the inlet pipeline of the variable volume compressor and the outlet pipeline of the variable volume compressor.
According to another aspect of the present invention, there is provided a device for determining a capacity change of a variable capacity compressor, comprising: a memory; and a processor coupled to the memory, the processor configured to perform the method as described above based on instructions stored in the memory.
According to still another aspect of the present invention, there is provided a control apparatus comprising: the device for judging the variable capacity switching of the variable capacity compressor is described above.
According to still another aspect of the present invention, there is provided a variable capacity compressor comprising: the control device as described above.
According to still another aspect of the present invention, there is provided an air conditioning unit comprising: a variable capacity compressor as described above.
According to yet another aspect of the present invention, there is provided a computer readable storage medium having stored thereon computer instructions for execution by a processor to perform the method as described above.
The invention relates to a method and a device for judging variable capacity switching of a variable capacity compressor, a control device, the variable capacity compressor, an air conditioning unit and a storage medium, wherein the method and the device are used for obtaining the change rate of the flow rate of a refrigerant based on the flow rate of the refrigerant collected before and after a switching mechanism executes the switching action of a compression cylinder; whether the switching mechanism executes the compression cylinder switching action or not can be accurately judged, the operation of a single cylinder, multiple cylinders and the like of the variable-capacity compressor can be effectively controlled, the variable-capacity compressor can operate in the optimal state, the service life and the use comfort of the variable-capacity compressor can be improved, the product competitiveness can be improved, and the use sensitivity of customers can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of an embodiment of a method for determining a variable capacity switching of a variable capacity compressor according to the present invention;
FIG. 2 is a schematic diagram of a switching mechanism of the variable capacity compressor;
FIG. 3 is a schematic flow chart of the method for determining the capacity-variable switching of the variable capacity compressor according to the present invention;
fig. 4 is a schematic flow chart illustrating a process of obtaining a first refrigerant flow rate change rate in an embodiment of a method for determining a variable capacity switching of a variable capacity compressor according to the present invention;
fig. 5 is a schematic flow chart illustrating a method for determining whether a flow rate of a refrigerant is stable according to an embodiment of the method for determining a variable capacity switching of a variable capacity compressor of the present invention;
fig. 6 is a block diagram illustrating an embodiment of the apparatus for determining the variable capacity switching of the variable capacity compressor according to the present invention;
fig. 7 is a schematic block diagram of a refrigerant flow rate obtaining module in an embodiment of the device for determining variable capacity switching of a variable capacity compressor according to the present invention;
fig. 8 is a block diagram illustrating another embodiment of the apparatus for determining the variable capacity switching of the variable capacity compressor according to the present invention.
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The technical solution of the present invention is described in various aspects below with reference to various figures and embodiments.
Hereinafter, "first", "second", etc. are only descriptive differences and have no other special meanings.
Fig. 1 is a schematic flow chart of an embodiment of a method for determining the variable capacity switching of the variable capacity compressor according to the present invention, as shown in fig. 1:
The variable-capacity compressor can be a variable-capacity double-cylinder compressor, can also be a variable-capacity compressor with three or more cylinders, and the like, and each compression cylinder of the variable-capacity compressor can be an equal-capacity cylinder and also can be a large cylinder and a small cylinder. The variable capacity compressor may be a variable capacity variable frequency variable capacity compressor.
And 103, judging whether the compression cylinder switching action executed by the switching mechanism is successful or not according to a preset switching success judgment rule and the first refrigerant flow rate change rate. The first refrigerant flow rate change rate is a positive value (usually not 0), and the compression cylinder switching action can be a plurality of actions such as switching double cylinders to small cylinders, switching the small cylinders to the double cylinders and the like.
When the compression cylinder switching action is executed, the air displacement of the compressor is suddenly changed, the system refrigerant is greatly changed under the condition that the running frequency of the compressor is not changed, and whether the compression cylinder switching action is successfully executed can be judged through the flow rate of the refrigerant before and after the compression cylinder switching action is executed. For example, for a variable-capacity large-cylinder and small-cylinder compressor, when a switching action of a single-cylinder and double-cylinder compression cylinder is performed, the displacement of the compressor is suddenly increased, the flow of refrigerant on an air suction pipe (an exhaust pipe) is suddenly increased, and the flow rate of the refrigerant is increased in proportion under the condition that the sectional area of a copper pipe is not changed; when the compression cylinder switching action of double-cylinder switching single cylinder is executed, the refrigerant flow rate is reduced in the same proportion. Assuming that the displacement of the single-cylinder operation of the variable-capacity compressor under the frequency A is x, and the displacement of the double-cylinder operation is 2x, when the switching action of the compression cylinder of the double-cylinder single-cylinder switching is executed, the displacement of the variable-capacity compressor is suddenly changed into x from 2x, and the flow (namely the displacement) is halved according to the calculation of the flow rate which is equal to the flow rate/the sectional area, and then the flow rate is also halved under the same pipeline.
The jar principle of cutting of varactor compressor is different, and the switching mechanism that then uses corresponds differently, has different switching mechanisms to different varactor compressors. As shown in fig. 2, the switching mechanism of the variable displacement compressor includes the pipes 11 and 12, the solenoid valve A, B, and the like. The switching mechanism executes the switching action of the compression cylinder of single-cylinder and double-cylinder switching by changing the pressure of the variable capacity port. For example, when the electromagnetic valve A is opened and the electromagnetic valve B is closed, the variable-capacity port is introduced with high pressure, and the variable-capacity compressor operates in double cylinders; and when the electromagnetic valve A is closed and the electromagnetic valve B is opened, the variable volume port is introduced with low pressure, and the variable volume compressor operates in a single cylinder.
The refrigerant flow velocity detection device can adopt the existing various refrigerant flow velocity detection devices and is used for detecting the flow velocity of the refrigerant in the refrigerant pipeline. The refrigerant flow velocity detection device may be disposed in a plurality of refrigerant pipelines, and preferably, the refrigerant pipeline disposed in the refrigerant flow velocity detection device is an inlet pipeline of the variable displacement compressor, an outlet pipeline of the variable displacement compressor, and the like, for example, as shown in fig. 2, a pipeline from the compressor to the four-way valve, a pipeline from the vapor-liquid separator to the compressor, and the like.
In one embodiment, the switching success determination rule for determining whether the switching action of the compression cylinder is successful may employ a variety of rules. Fig. 3 is a schematic flow chart of the method for determining the variable capacity switching of the variable capacity compressor according to the embodiment of the present invention, and is illustrated in fig. 3:
in step 301, a first rate of change threshold is obtained. The specific value of the first change rate threshold is related to factors such as the type of the variable displacement compressor, a refrigerant pipeline arranged on the refrigerant flow rate detection device, and the type of the refrigerant, and can be determined through experiments and the like, for example, 20kpa is used.
If the switching mechanism is determined to be successful in executing the compression cylinder switching action, an execution success message can be sent to the control device, and if the switching mechanism is determined to be failed in executing the compression cylinder switching action, an execution failure message can be sent to the control device, so that the control device can perform corresponding processing according to the execution result of the compression cylinder switching action.
Fig. 4 is a schematic flow chart of obtaining a first refrigerant flow rate change rate in an embodiment of the method for determining variable capacity switching of a variable capacity compressor according to the present invention, as shown in fig. 4:
In step 402, a first refrigerant flow rate is obtained if yes.
In step 403, after the switching mechanism performs the switching operation of the compression cylinder, a second refrigerant flow rate is obtained after a preset first time period. The first time period is related to factors such as the type of the variable-capacity compressor, a refrigerant pipeline arranged on the refrigerant flow rate detection device, the type of the refrigerant and the like, and can be determined through experiments and the like, for example, the first time period is 2-10 minutes and the like.
In step 404, an absolute value of a difference between the first refrigerant flow rate and the second refrigerant flow rate is obtained, and a ratio of the absolute value to the first time period is used as the first refrigerant flow rate change rate.
Various methods can be used to determine whether the flow rate of the refrigerant in the refrigerant pipeline is stable. Fig. 5 is a schematic flow chart of determining whether the flow rate of the refrigerant is stable according to an embodiment of the method for determining the variable capacity switching of the variable capacity compressor of the present invention, as shown in fig. 5:
The absolute value of the difference between the fourth refrigerant flow rate and the third refrigerant flow rate can be obtained, and the ratio of the absolute value to the second time duration is used as the second refrigerant flow rate change rate. The flow velocity stability judgment rule may adopt various judgment rules. For example, a second rate of change threshold is obtained; the specific value of the second variation rate threshold is related to factors such as the type of the variable displacement compressor, a refrigerant pipeline set by the refrigerant flow rate detection device, and the type of the refrigerant, and can be determined through experiments and the like, for example, 2kpa and the like.
And comparing the second refrigerant flow rate change rate with a second change rate threshold value, and judging whether the refrigerant flow rate in the refrigerant pipeline is stable or not based on the comparison result. For example, if the change rate of the second refrigerant flow rate is greater than the second change rate threshold, it is determined that the refrigerant flow rate in the refrigerant pipeline is unstable; and if the change rate of the second refrigerant flow rate is less than or equal to the second change rate threshold value, determining that the refrigerant flow rate in the refrigerant pipeline is stable.
If the flow rate of the refrigerant in the refrigerant pipeline is determined to be stable, a flow rate stability message can be sent to the control device. The value of the first refrigerant flow rate may be a value of a fourth refrigerant flow rate, or the refrigerant flow rate acquired by the refrigerant flow rate detection device may be obtained after the refrigerant flow rate is determined to be stable and before the switching mechanism performs the switching operation of the compression cylinder, and the refrigerant flow rate may be used as the first refrigerant flow rate. If the flow rate of the refrigerant in the refrigerant pipeline is determined to be unstable, an alarm message can be sent to the control device. And after receiving the flow velocity stabilization message, the control device can control the switching mechanism to execute the switching action of the compression cylinder. After the control device receives the alarm message, the compression cylinder switching action can be executed temporarily, and the compression cylinder switching action is executed again after the flow rate of the refrigerant is determined to be stable.
In one embodiment, when it is determined that the switching mechanism needs to perform the compression cylinder switching operation, a third refrigerant flow rate S1 and a fourth refrigerant flow rate S2 collected by the refrigerant flow rate detection device at a preset second time interval T1 are obtained, a second refrigerant flow rate change rate △ S1 ═ S2-S1|/T1 is calculated, and if △ S is less than or equal to a second change rate threshold a, the refrigerant flow rate is determined to be stable, the first refrigerant flow rate may be set to S2, or after the refrigerant flow rate is determined to be stable and before the switching mechanism performs the compression cylinder switching operation, the refrigerant flow rate S4 collected by the refrigerant flow rate detection device is obtained, and the first refrigerant flow rate is set to S4.
The switching mechanism executes a compression cylinder switching action, a second refrigerant flow speed S3 is obtained after a first time length T2, a first refrigerant flow speed change rate △ S2 is | -S3-S2 |/T2 is calculated, if △ S2 is not less than a first change rate threshold b, the switching mechanism executes the compression cylinder switching action successfully, if △ S2 < b, the cylinder switching failure is considered, a, b, T1 and T2 are preset, and specific numerical values can be obtained through experimental data.
In one embodiment, as shown in fig. 6, the present invention provides a device 60 for determining the variable capacity switching of a variable capacity compressor, comprising: a refrigerant flow rate obtaining module 61, a change rate obtaining module 62 and a switching operation judging module 63. The refrigerant flow rate obtaining module 61 obtains a first refrigerant flow rate collected by the refrigerant flow rate detection device arranged on the refrigerant pipeline before the switching mechanism performs the compression cylinder switching action and a second refrigerant flow rate collected after the switching mechanism performs the compression cylinder switching action. The refrigerant pipeline comprises an inlet pipeline of the variable capacity compressor, an outlet pipeline of the variable capacity compressor and the like.
The change rate obtaining module 62 obtains a first refrigerant flow rate change rate based on the first refrigerant flow rate and the second refrigerant flow rate. The switching operation determining module 63 determines whether the switching action of the compression cylinder performed by the switching mechanism is successful according to a preset switching success determining rule and the first refrigerant flow rate change rate.
In one embodiment, the switching operation determining module 63 obtains a first change rate threshold, compares the first refrigerant flow rate change rate with the first change rate threshold, and determines whether the switching mechanism performs the compression cylinder switching operation successfully based on the comparison result. For example, if the first refrigerant flow rate change rate is greater than or equal to the first change rate threshold, the switching operation determining module 63 determines that the switching mechanism performs the compression cylinder switching operation successfully; if the first refrigerant flow rate change rate is less than the first change rate threshold, the switching operation determination module 63 determines that the switching mechanism fails to perform the compression cylinder switching operation.
In one embodiment, as shown in fig. 7, the refrigerant flow rate obtaining module 61 includes: a state judgment unit 611, a flow rate obtaining unit 612, and an alarm unit 613. The state determination unit 611 determines whether the refrigerant flow rate in the refrigerant pipeline is stable when it is determined that the switching mechanism needs to perform the compression cylinder switching operation. If the refrigerant flow rate in the refrigerant pipeline is stable, the flow rate obtaining unit 612 obtains a first refrigerant flow rate, and obtains a second refrigerant flow rate after the switching mechanism performs the switching operation of the compression cylinder for a preset first time. The change rate obtaining module 62 obtains an absolute value of a difference between the first refrigerant flow rate and the second refrigerant flow rate, and uses a ratio of the absolute value to the first time period as the first refrigerant flow rate change rate.
The state determination unit 611 obtains a third refrigerant flow rate and a fourth refrigerant flow rate, which are acquired by the refrigerant flow rate detection device at a preset interval for a second time, and obtains a second refrigerant flow rate change rate based on the third refrigerant flow rate and the fourth refrigerant flow rate. The state determination unit 611 determines whether the flow rate of the refrigerant in the refrigerant pipeline is stable according to a preset flow rate stability determination rule and a second refrigerant flow rate change rate. The state determination unit 611 obtains an absolute value of a difference between the fourth refrigerant flow rate and the third refrigerant flow rate, and uses a ratio of the absolute value to the second time period as the second refrigerant flow rate change rate.
The state determination unit 611 obtains a second change rate threshold, compares the second refrigerant flow rate change rate with the second change rate threshold, and determines whether the refrigerant flow rate in the refrigerant pipeline is stable based on the comparison result. For example, if the second refrigerant flow rate change rate is greater than the second change rate threshold, the state determination unit 611 determines that the refrigerant flow rate in the refrigerant pipeline is unstable; if the second refrigerant flow rate change rate is less than or equal to the second change rate threshold, the state determination unit 611 determines that the refrigerant flow rate in the refrigerant pipeline is stable. If it is determined that the flow rate of the refrigerant in the refrigerant line is not stable, the alarm unit 613 sends an alarm message.
Fig. 8 is a block diagram illustrating another embodiment of the apparatus for determining the variable capacity switching of the variable capacity compressor according to the present invention. As shown in fig. 8, the apparatus may include a memory 81, a processor 82, a communication interface 83, and a bus 84. The memory 81 is used for storing instructions, the processor 82 is coupled to the memory 81, and the processor 82 is configured to execute the determination method for implementing the above-mentioned variable capacity switching of the variable capacity compressor based on the instructions stored in the memory 81.
The memory 81 may be a high-speed RAM memory, a non-volatile memory (non-volatile memory), or the like, and the memory 81 may be a memory array. The storage 81 may also be partitioned and the blocks may be combined into virtual volumes according to certain rules. The processor 82 may be a central processing unit CPU, or an application specific integrated circuit asic, or one or more integrated circuits configured to implement the method for determining the variable capacitance switching of the variable capacitance compressor of the present invention.
In one embodiment, the present invention provides a control apparatus comprising: the device for judging the variable capacity switching of the variable capacity compressor in any one of the above embodiments.
In one embodiment, the present invention provides a variable capacity compressor comprising a control apparatus as in any of the above embodiments.
In one embodiment, the invention provides an air conditioning unit comprising a variable capacity compressor as in any one of the embodiments above.
In one embodiment, the present invention provides a computer readable storage medium storing computer instructions, which when executed by a processor, implement the method for determining the variable capacitance switching of the variable capacitance compressor as in any one of the above embodiments.
In the method and the device for judging the variable capacity switching of the variable capacity compressor, the control device, the variable capacity compressor, the air conditioning unit and the storage medium in the embodiment, the first refrigerant flow rate change rate is obtained based on the first refrigerant flow rate acquired by the refrigerant flow rate detection device before the compression cylinder switching action is executed by the switching mechanism and the second refrigerant flow rate acquired after the compression cylinder switching action is executed by the switching mechanism, and whether the compression cylinder switching action is executed by the switching mechanism is successful is judged according to the switching success judgment rule and the first refrigerant flow rate change rate; whether the switching mechanism executes the compression cylinder switching action or not can be accurately judged, the operation of a single cylinder, multiple cylinders and the like of the variable-capacity compressor can be effectively controlled, the variable-capacity compressor is enabled to operate in the optimal state, the service life and the use comfort of the variable-capacity compressor can be improved, the product competitiveness is improved, and the use sensitivity of customers can be improved.
The method and system of the present invention may be implemented in a number of ways. For example, the methods and systems of the present invention may be implemented in software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically indicated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (27)
1. A method for judging the variable capacity switching of a variable capacity compressor is characterized by comprising the following steps:
the method comprises the steps that a first refrigerant flow rate collected by a refrigerant flow rate detection device arranged on a refrigerant pipeline before a compression cylinder switching action is executed by a switching mechanism and a second refrigerant flow rate collected after the compression cylinder switching action is executed by the switching mechanism are obtained; when the switching mechanism is determined to need to execute the compression cylinder switching action, judging whether the flow rate of the refrigerant in the refrigerant pipeline is stable, and if so, obtaining the first refrigerant flow rate;
obtaining a first refrigerant flow rate change rate based on the first refrigerant flow rate and the second refrigerant flow rate;
and judging whether the switching mechanism successfully executes the switching action of the compression cylinder or not according to a preset switching success judgment rule and the first refrigerant flow speed change rate.
2. The method as claimed in claim 1, wherein said determining whether the switching mechanism successfully performs the switching operation of the compression cylinder according to a predetermined switching success determination rule and the first refrigerant flow rate change rate comprises:
and obtaining a first change rate threshold, comparing the first refrigerant flow speed change rate with the first change rate threshold, and judging whether the switching mechanism successfully executes the compression cylinder switching action or not based on the comparison result.
3. The method of claim 2, wherein said determining whether the switching mechanism successfully performs the compression cylinder switching action based on the comparison comprises:
if the change rate of the first refrigerant flow velocity is greater than or equal to the first change rate threshold value, determining that the switching mechanism successfully executes the compression cylinder switching action;
and if the change rate of the first refrigerant flow rate is smaller than the first change rate threshold value, determining that the switching mechanism fails to execute the compression cylinder switching action.
4. The method as claimed in claim 1, wherein the obtaining a first refrigerant flow rate collected by a refrigerant flow rate detector disposed on a refrigerant line before a switching mechanism performs a compression cylinder switching operation and a second refrigerant flow rate collected after the switching mechanism performs the compression cylinder switching operation further comprises:
and after the switching mechanism executes the switching action of the compression cylinder, obtaining the second refrigerant flow rate after a preset first time.
5. The method of claim 4, wherein the determining whether the flow rate of the refrigerant in the refrigerant pipeline is stable comprises:
acquiring a third refrigerant flow rate and a fourth refrigerant flow rate acquired by the refrigerant flow rate detection device at a preset interval for a second time;
obtaining a second refrigerant flow rate change rate based on the third refrigerant flow rate and the fourth refrigerant flow rate;
and judging whether the flow rate of the refrigerant in the refrigerant pipeline is stable or not according to a preset flow rate stability judgment rule and the second refrigerant flow rate change rate.
6. The method of claim 5, wherein the determining whether the refrigerant flow rate in the refrigerant pipeline is stable according to a preset flow rate stability determination rule and the second refrigerant flow rate change rate comprises:
and obtaining a second change rate threshold, comparing the second refrigerant flow rate change rate with the second change rate threshold, and judging whether the refrigerant flow rate in the refrigerant pipeline is stable or not based on the comparison result.
7. The method of claim 6, wherein the determining whether the flow rate of the refrigerant in the refrigerant pipeline is stable based on the comparison comprises:
if the second refrigerant flow rate change rate is larger than the second change rate threshold value, determining that the refrigerant flow rate in the refrigerant pipeline is unstable;
and if the second refrigerant flow rate change rate is smaller than or equal to the second change rate threshold value, determining that the refrigerant flow rate in the refrigerant pipeline is stable.
8. The method of claim 5, wherein obtaining a second refrigerant flow rate change rate based on the third refrigerant flow rate and the fourth refrigerant flow rate comprises:
and obtaining an absolute value of the difference between the fourth refrigerant flow rate and the third refrigerant flow rate, and taking the ratio of the absolute value to the second time length as the second refrigerant flow rate change rate.
9. The method of claim 4, further comprising:
and if the flow rate of the refrigerant in the refrigerant pipeline is determined to be unstable, sending an alarm message.
10. The method of claim 4, wherein obtaining a first refrigerant flow rate change rate based on the first refrigerant flow rate and the second refrigerant flow rate comprises:
and obtaining an absolute value of the difference between the first refrigerant flow velocity and the second refrigerant flow velocity, and taking the ratio of the absolute value to the first time length as the first refrigerant flow velocity change rate.
11. The method of claim 1, wherein,
the refrigerant pipeline includes: the inlet pipeline of the variable volume compressor and the outlet pipeline of the variable volume compressor.
12. A judgment device for variable capacity switching of a variable capacity compressor is characterized by comprising:
the refrigerant flow rate acquisition module is used for acquiring a first refrigerant flow rate acquired by a refrigerant flow rate detection device arranged on a refrigerant pipeline before the switching mechanism executes the compression cylinder switching action and a second refrigerant flow rate acquired after the switching mechanism executes the compression cylinder switching action;
wherein, refrigerant velocity of flow obtains the module, includes: the state judgment unit is used for judging whether the flow rate of the refrigerant in the refrigerant pipeline is stable or not when the switching mechanism needs to execute the switching action of the compression cylinder;
the flow rate obtaining unit is used for obtaining the first refrigerant flow rate if the refrigerant flow rate in the refrigerant pipeline is stable;
the change rate obtaining module is used for obtaining a first refrigerant flow rate change rate based on the first refrigerant flow rate and the second refrigerant flow rate;
and the switching operation judging module is used for judging whether the switching mechanism successfully executes the switching action of the compression cylinder according to a preset switching success judging rule and the first refrigerant flow rate change rate.
13. The apparatus of claim 12, wherein,
the switching operation judging module is used for obtaining a first change rate threshold value; and comparing the first refrigerant flow rate change rate with the first change rate threshold, and judging whether the switching mechanism successfully executes the compression cylinder switching action or not based on the comparison result.
14. The apparatus of claim 13, wherein,
the switching operation judging module is used for determining that the switching mechanism successfully executes the switching action of the compression cylinder if the change rate of the first refrigerant flow speed is greater than or equal to the first change rate threshold value; and if the change rate of the first refrigerant flow rate is smaller than the first change rate threshold value, determining that the switching mechanism fails to execute the compression cylinder switching action.
15. The apparatus of claim 12, wherein,
the flow rate obtaining unit is further configured to obtain the second refrigerant flow rate after the switching mechanism performs the compression cylinder switching operation for a preset first time period.
16. The apparatus of claim 15, wherein,
the state judgment unit is used for acquiring a third refrigerant flow rate and a fourth refrigerant flow rate which are acquired by the refrigerant flow rate detection device at a preset interval for a second time; obtaining a second refrigerant flow rate change rate based on the third refrigerant flow rate and the fourth refrigerant flow rate; and judging whether the flow rate of the refrigerant in the refrigerant pipeline is stable or not according to a preset flow rate stability judgment rule and the second refrigerant flow rate change rate.
17. The apparatus of claim 16, wherein,
the state judgment unit is used for obtaining a second change rate threshold value; and comparing the second refrigerant flow rate change rate with the second change rate threshold, and judging whether the refrigerant flow rate in the refrigerant pipeline is stable or not based on the comparison result.
18. The apparatus of claim 17, wherein,
the state judgment unit is further configured to determine that the flow rate of the refrigerant in the refrigerant pipeline is unstable if the second refrigerant flow rate change rate is greater than the second change rate threshold; and if the second refrigerant flow rate change rate is smaller than or equal to the second change rate threshold value, determining that the refrigerant flow rate in the refrigerant pipeline is stable.
19. The apparatus of claim 16, wherein,
the state judgment unit is configured to obtain an absolute value of a difference between the fourth refrigerant flow rate and the third refrigerant flow rate, and use a ratio of the absolute value to the second time period as the second refrigerant flow rate change rate.
20. The apparatus of claim 15, wherein,
the refrigerant flow velocity obtaining module includes:
and the alarm unit is used for sending an alarm message if the flow rate of the refrigerant in the refrigerant pipeline is determined to be unstable.
21. The apparatus of claim 15, wherein,
the change rate obtaining module is configured to obtain an absolute value of a difference between the first refrigerant flow rate and the second refrigerant flow rate, and use a ratio of the absolute value to the first duration as the first refrigerant flow rate change rate.
22. The apparatus of claim 12, wherein,
the refrigerant pipeline includes: the inlet pipeline of the variable volume compressor and the outlet pipeline of the variable volume compressor.
23. A device for determining a capacity change switching of a variable capacity compressor, comprising:
a memory; and a processor coupled to the memory, the processor configured to perform the method of any of claims 1-11 based on instructions stored in the memory.
24. A control device, comprising:
a device for determining a capacity change of a variable capacity compressor according to any one of claims 12 to 23.
25. A variable capacity compressor, comprising:
the control device of claim 24.
26. An air conditioning assembly, comprising:
the variable capacity compressor of claim 25.
27. A computer-readable storage medium having stored thereon computer instructions for execution by a processor to perform the method of any one of claims 1 to 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811219728.8A CN109357453B (en) | 2018-10-19 | 2018-10-19 | Method and device for judging variable capacity switching of variable capacity compressor and control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811219728.8A CN109357453B (en) | 2018-10-19 | 2018-10-19 | Method and device for judging variable capacity switching of variable capacity compressor and control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109357453A CN109357453A (en) | 2019-02-19 |
| CN109357453B true CN109357453B (en) | 2020-05-22 |
Family
ID=65345925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811219728.8A Active CN109357453B (en) | 2018-10-19 | 2018-10-19 | Method and device for judging variable capacity switching of variable capacity compressor and control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109357453B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110940114A (en) * | 2019-10-28 | 2020-03-31 | 珠海格力电器股份有限公司 | Control method for reducing oil shortage and liquid impact faults during operation of air conditioner and air conditioner |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02290715A (en) * | 1989-04-29 | 1990-11-30 | Nissan Motor Co Ltd | Air conditioner for vehicle |
| CN1296129A (en) * | 1999-08-04 | 2001-05-23 | 株式会社丰田自动织机制作所 | Valve for controlling air condition system and control method thereof |
| CN1302992A (en) * | 1999-11-25 | 2001-07-11 | 株式会社丰田自动织机制作所 | Air regulator and controlling valve of varator type compressor |
| US7287395B2 (en) * | 2004-03-15 | 2007-10-30 | Emerson Climate Technologies, Inc. | Distributed cooling system |
| JP2008106953A (en) * | 2006-10-23 | 2008-05-08 | Daikin Ind Ltd | Refrigerating device |
| CN104654516A (en) * | 2013-11-21 | 2015-05-27 | 珠海格力电器股份有限公司 | Control method and system of variable-frequency variable-capacity compressor |
| CN105466060A (en) * | 2015-12-28 | 2016-04-06 | 珠海格力电器股份有限公司 | Variable-capacity two-stage compression system and control method thereof |
-
2018
- 2018-10-19 CN CN201811219728.8A patent/CN109357453B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02290715A (en) * | 1989-04-29 | 1990-11-30 | Nissan Motor Co Ltd | Air conditioner for vehicle |
| CN1296129A (en) * | 1999-08-04 | 2001-05-23 | 株式会社丰田自动织机制作所 | Valve for controlling air condition system and control method thereof |
| CN1302992A (en) * | 1999-11-25 | 2001-07-11 | 株式会社丰田自动织机制作所 | Air regulator and controlling valve of varator type compressor |
| US7287395B2 (en) * | 2004-03-15 | 2007-10-30 | Emerson Climate Technologies, Inc. | Distributed cooling system |
| JP2008106953A (en) * | 2006-10-23 | 2008-05-08 | Daikin Ind Ltd | Refrigerating device |
| CN104654516A (en) * | 2013-11-21 | 2015-05-27 | 珠海格力电器股份有限公司 | Control method and system of variable-frequency variable-capacity compressor |
| CN105466060A (en) * | 2015-12-28 | 2016-04-06 | 珠海格力电器股份有限公司 | Variable-capacity two-stage compression system and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109357453A (en) | 2019-02-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2017187030A (en) | Methods and systems for detecting and preventing compressor surge | |
| CN105674479A (en) | Operation control method and device for multi-split air conditioner | |
| CN109357453B (en) | Method and device for judging variable capacity switching of variable capacity compressor and control device | |
| CN110500825B (en) | Electronic expansion valve fault diagnosis method and device, air conditioner and storage medium | |
| CN103256767A (en) | Method for controlling evaporation temperature of water side heat exchanger of air conditioner and air conditioner | |
| CN112212464A (en) | Control system, method and device of data center air conditioning unit and storage medium | |
| CN114109860B (en) | Air compressor, air compressor control method and device, electronic equipment and storage medium | |
| US11808261B2 (en) | Variable capacity compressor operation mode determination method and device, variable capacity compressor, and air conditioner | |
| CN108131859B (en) | Air conditioning system of variable capacity compressor, control method of air conditioning system, storage medium and processor | |
| CN113865001A (en) | Air conditioning unit control method and device and air conditioning unit | |
| CN109237711B (en) | Air-cooled water chilling unit refrigerating system and starting control method thereof | |
| CN115127194B (en) | Method, equipment and medium for detecting faults of central air conditioner water chilling unit | |
| CN110319650A (en) | A kind of control method, device and the computer equipment of compressor car refrigerator | |
| CN109357452B (en) | Compressor cylinder body switching detection method and device and air conditioner | |
| KR20140008680A (en) | Air conditioner and method for controlling the same | |
| CN110107492B (en) | Compressor cylinder cutting detection method and device, air conditioner and storage medium | |
| CN114904665B (en) | Anti-surge control method and device for magnetic suspension centrifuge and storage medium | |
| KR101356312B1 (en) | Air conditioner and method for controlling the same | |
| WO2020052234A1 (en) | Compressor oil return control method and apparatus | |
| JP2006170575A (en) | Compressor control system | |
| JP7423922B2 (en) | Anomaly detection device, anomaly detection system and control program | |
| CN117553442A (en) | Water chilling unit, control method and device thereof, storage medium and electronic equipment | |
| CN117469867A (en) | Air conditioning unit, control method and device for air conditioning unit and computer readable storage medium | |
| CN112728821B (en) | Compressor ultralow-temperature safe operation control method, device, equipment and storage medium | |
| CN113847702B (en) | Air conditioner refrigerant leakage monitoring method and air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |