CN113776243B - Compressor control method, compressor unit, electronic equipment and storage medium - Google Patents
Compressor control method, compressor unit, electronic equipment and storage medium Download PDFInfo
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- CN113776243B CN113776243B CN202110976156.3A CN202110976156A CN113776243B CN 113776243 B CN113776243 B CN 113776243B CN 202110976156 A CN202110976156 A CN 202110976156A CN 113776243 B CN113776243 B CN 113776243B
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- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000006835 compression Effects 0.000 claims abstract description 355
- 238000007906 compression Methods 0.000 claims abstract description 355
- 239000013589 supplement Substances 0.000 claims description 34
- 230000001502 supplementing effect Effects 0.000 claims description 14
- 238000004590 computer program Methods 0.000 claims description 11
- 239000003507 refrigerant Substances 0.000 description 24
- 239000003921 oil Substances 0.000 description 18
- 238000001816 cooling Methods 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 9
- 230000006698 induction Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
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- 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
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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 invention discloses a compressor control method, a compressor unit, electronic equipment and a storage medium. Wherein, the compressor includes at least two stages of compression units that connect gradually, and the method includes: acquiring the outdoor environment temperature; and if the outdoor environment temperature is less than or equal to a first preset temperature, controlling the compressor to perform single-stage compression in the unit starting stage. Under the low-temperature working condition, the compressor operates according to the single-stage compression mode in the unit starting stage, the exhaust temperature of single-stage compression is higher than that of multi-stage compression, so that the speed of establishing the superheat degree is accelerated, the superheat degree can be quickly established, and the condition that the compressor is lack of oil due to slow establishment of the superheat degree is avoided.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a compressor control method, a compressor unit, electronic equipment and a storage medium.
Background
At present, a single-stage compressor or a single-stage air supply compressor is generally used in the unit, and the double-stage compressor has a remarkable improvement effect on low-temperature heating capacity, particularly the effect is more obvious when the ambient temperature is lower, and even the ultralow-temperature heating at-20 ℃ is not attenuated, so that the double-stage compressor can be used in some units.
However, when the compressor is started in a cold state under an ultralow temperature working condition, the exhaust superheat degree of the two-stage compressor is established very slowly, the refrigerant discharged by the compressor is easy to be condensed into liquid and returns to the compressor, the capacity of the liquid refrigerant carrying lubricating oil is enhanced, the oil return of the compressor is influenced, and even long-time oil shortage is caused to influence the reliability of the compressor.
Disclosure of Invention
The embodiment of the invention provides a compressor control method, a unit, electronic equipment and a storage medium, which at least solve the problem of oil shortage when a compressor is started under a low-temperature working condition in the prior art.
In order to solve the above technical problem, an embodiment of the present invention provides a method for controlling a compressor, where the compressor includes at least two stages of compression units connected in sequence, and the method for controlling the compressor includes:
acquiring the outdoor environment temperature;
and if the outdoor environment temperature is less than or equal to a first preset temperature, controlling the compressor to perform single-stage compression in the unit starting stage.
Optionally, in a starting stage of the unit, the compressor is controlled to perform single-stage compression, including: controlling a bypass pipeline connected with the appointed compression unit to be in a communicated state;
the appointed compression unit is used for single-stage compression in at least two stages of compression units, a suction port of the appointed compression unit is connected to a suction port of the first stage compression unit through a first bypass pipeline, and/or an exhaust port of the appointed compression unit is connected to an exhaust port of the last stage compression unit through a second bypass pipeline.
Optionally, the compressor includes at least one air supplement port, and the at least one air supplement port is connected to an air supplement device through an air supplement pipeline respectively;
at the unit start-up stage, control the compressor carries out single-stage compression, still include: and controlling all the air supplement pipelines to be in a disconnected state.
Optionally, after controlling the compressor to perform single-stage compression, the method further includes: and when the superheat degree parameter meets the preset requirement, controlling the compressor to be switched from single-stage compression to multi-stage compression.
Optionally, controlling the compressor to switch from single-stage compression to multi-stage compression comprises: controlling a bypass pipeline connected with the appointed compression unit to be in a disconnected state;
the appointed compression unit is used for single-stage compression in at least two stages of compression units, a suction port of the appointed compression unit is connected to a suction port of the first stage compression unit through a first bypass pipeline, and/or an exhaust port of the appointed compression unit is connected to an exhaust port of the last stage compression unit through a second bypass pipeline.
Optionally, the superheat parameter meets a preset requirement, including: the exhaust superheat degree is greater than or equal to a second preset temperature, and/or the oil temperature superheat degree is greater than or equal to a third preset temperature.
Optionally, after obtaining the outdoor ambient temperature, the method further includes: and if the outdoor environment temperature is higher than the first preset temperature, controlling the compressor to perform multi-stage compression in the unit starting stage.
Optionally, in a starting stage of the unit, the compressor is controlled to perform multi-stage compression, including: controlling a bypass pipeline connected with the appointed compression unit to be in a disconnected state;
the appointed compression unit is used for single-stage compression in at least two stages of compression units, a suction port of the appointed compression unit is connected to a suction port of the first stage compression unit through a first bypass pipeline, and/or an exhaust port of the appointed compression unit is connected to an exhaust port of the last stage compression unit through a second bypass pipeline.
Optionally, the first bypass pipeline and the second bypass pipeline are both provided with a first on-off control element.
Optionally, each of the air supply lines is provided with a second on-off control element.
The embodiment of the invention also provides a unit, which comprises a compressor, wherein the compressor comprises at least two stages of compression units which are sequentially connected, the compression unit which is used for single-stage compression in the at least two stages of compression units is marked as a designated compression unit, an air suction port of the designated compression unit is connected to an air suction port of a first stage of compression unit through a first bypass pipeline, and/or an air exhaust port of the designated compression unit is connected to an air exhaust port of a last stage of compression unit through a second bypass pipeline;
if the bypass pipeline connected with the specified compression unit is in a communicated state, the compressor performs single-stage compression;
and if the bypass pipeline connected with the specified compression unit is in a disconnected state, the compressor performs multi-stage compression.
Optionally, the first bypass pipeline and the second bypass pipeline are both provided with a first on-off control element.
Optionally, a connecting pipeline between adjacent compression units is provided with an air supplement port, and each air supplement port is connected to an air supplement device through an air supplement pipeline.
Optionally, each of the air supply lines is provided with a second on-off control element.
An embodiment of the present invention further provides an electronic device, including: the device comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the method of the embodiment of the invention.
Embodiments of the present invention further provide a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of the method according to the embodiments of the present invention.
By applying the technical scheme of the invention, the outdoor environment temperature is obtained; and if the outdoor environment temperature is less than or equal to the first preset temperature, controlling the compressor to perform single-stage compression in the unit starting stage. Under the low temperature operating mode, the unit start-up stage makes the compressor operate according to the single-stage compression mode, and the exhaust temperature of single-stage compression is higher than the exhaust temperature of multistage compression, therefore the speed of establishing the superheat degree can accelerate, can establish the superheat degree fast, avoids leading to the compressor lack of oil because of the superheat degree is established slowly.
Drawings
Fig. 1 is a flowchart of a compressor control method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a single cooling unit (utilizing flash evaporator for air supplement) according to a second embodiment of the present invention;
FIG. 3 is a schematic view of a heat pump unit (utilizing flash evaporator to supplement air) according to a second embodiment of the present invention;
FIG. 4 is a schematic view of a single cooling unit (utilizing a plate heat exchanger for air supplement) according to a second embodiment of the present invention;
FIG. 5 is a schematic view of a heat pump unit (utilizing a plate heat exchanger to supplement air) according to a second embodiment of the present invention;
FIG. 6 is a flowchart of a compressor control method according to a second embodiment of the present invention;
fig. 7 is a block diagram showing a configuration of a compressor control device according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Example one
The present embodiment provides a method for controlling a compressor, where the compressor includes at least two stages of compression units connected in sequence, that is, the compressor can compress a refrigerant stage by stage.
Fig. 1 is a flowchart of a compressor control method according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
s101, acquiring the outdoor environment temperature.
And S102, if the outdoor environment temperature is less than or equal to the first preset temperature, controlling the compressor to perform single-stage compression in the unit starting stage.
The outdoor environment temperature can be obtained when a unit starting instruction is received, and the working mode of the compressor at the unit starting stage is determined according to the outdoor environment temperature. The operation modes of the compressor include: the single-stage compression mode refers to the mode that a first-stage compression unit is used for processing the refrigerant, and the multi-stage compression mode refers to the mode that at least two-stage compression units are used for processing the refrigerant. It can be understood that, in the multi-stage compression mode, part or all of the compression units may be used to process the refrigerant according to actual requirements.
The first preset temperature is a temperature threshold used for measuring whether the unit is in a low-temperature working condition, and the first preset temperature can be determined empirically or experimentally, for example, the first preset temperature is set to-5 ℃. And the outdoor environment temperature is less than or equal to the first preset temperature, which indicates that the unit is in a low-temperature working condition. When the compressor operates under the low-temperature working condition, the exhaust temperature of the single-stage compression is higher than that of the multi-stage compression, so that the speed of building the superheat degree is accelerated.
The compressor control method of the embodiment acquires the outdoor environment temperature; and if the outdoor environment temperature is less than or equal to the first preset temperature, controlling the compressor to perform single-stage compression in the unit starting stage. Under the low temperature operating mode, the unit makes the compressor operate according to single-stage compression mode in the start-up stage, and the exhaust temperature of single-stage compression is higher than the exhaust temperature of multistage compression, therefore the speed of establishing the superheat degree can accelerate, can establish the superheat degree fast, avoids leading to the compressor lack of oil because of the superheat degree is established slowly.
In one embodiment, after controlling the compressor to perform single-stage compression, the method further comprises: and when the superheat degree parameter meets the preset requirement, controlling the compressor to be switched from single-stage compression to multi-stage compression. At the starting stage of the unit, the superheat degree parameter changes along with the operation of the unit, if the superheat degree parameter meets the preset requirement, the superheat degree is established, at the moment, the compressor is switched into a multi-stage compression mode, the capacity requirement of the unit can be met, and the capacity of the unit is guaranteed not to be attenuated. Through the accurate switching control of the single-stage compression mode and the multi-stage compression mode of the compressor, the superheat degree can be quickly established through the single-stage compression mode, the phenomenon that the compressor is lack of oil due to the fact that the superheat degree is established slowly is avoided, the multi-stage compression mode can be switched after the superheat degree is established, and the requirement of unit capacity is met.
In one embodiment, the superheat parameter meets a preset requirement, including: the exhaust superheat degree is greater than or equal to a second preset temperature, and/or the oil temperature superheat degree is greater than or equal to a third preset temperature. The exhaust superheat degree can be calculated according to parameters such as exhaust temperature and condensation pressure collected by a unit, and the oil temperature superheat degree can be collected by a temperature collecting device. The second preset temperature is a value of the superheat of the exhaust gas required for normal operation of the unit, and for example, the second preset temperature may be set to 15 ℃. The third preset threshold is a value of superheat of oil temperature required by normal operation of the unit, for example, the third preset temperature may be set to 10 ℃. The exhaust superheat degree is larger than or equal to a second preset temperature, and/or the oil temperature superheat degree is larger than or equal to a third preset temperature, which indicates that the superheat degree is established, and the problem that the compressor is lack of oil due to the fact that liquid refrigerant is used for diluting lubricating oil does not exist.
In one embodiment, after obtaining the outdoor ambient temperature, the method further comprises: and if the outdoor environment temperature is higher than the first preset temperature, controlling the compressor to perform multi-stage compression in the unit starting stage. The outdoor environment temperature is higher than the first preset temperature, the unit is not in the low-temperature working condition, the problem of oil shortage caused by slow establishment of the exhaust superheat degree when the compressor is started under the low-temperature working condition does not exist, and at the starting stage of the unit, the compressor can be directly controlled to perform multi-stage compression, so that the unit capacity is not attenuated.
Switching between the single and dual compression modes of the compressor may be accomplished by related piping arrangements and controls, as will be described below.
The compressor comprises at least two stages of compression units which are connected in sequence, wherein the air suction port of the first stage of compression unit is used as the air suction port of the whole compressor, the air exhaust port of each stage of compression unit is connected to the air suction port of the next stage of compression unit, and the air exhaust port of the last stage of compression unit is used as the air exhaust port of the whole compressor.
The compression unit for performing single-stage compression in at least two stages of compression units of the compressor is referred to as a designated compression unit, and the designated compression unit may be any compression unit in the compressor. The specified compression unit can determine and install the related pipeline when the unit is produced, certainly, the related pipeline can be installed on part or all of the compression units when the unit is produced, so that the related pipeline is qualified as the specified compression unit, specifically, the priority can be set for all the compression units which are installed with the related pipeline and are qualified as the specified compression units, the compression unit with the highest priority is used as the default specified compression unit, and if the current default specified compression unit fails, the compression unit with the next priority is used as the new default specified compression unit, so that the situation that the unit cannot be normally started due to the failure of the fixed specified compression unit under the low-temperature working condition can be avoided.
The suction port of the designated compression unit is connected to the suction port of the first-stage compression unit through a first bypass line, and/or the discharge port of the designated compression unit is connected to the discharge port of the last-stage compression unit through a second bypass line.
The method comprises the following specific steps:
(1) if the designated compression unit is the first-stage compression unit, the exhaust port of the designated compression unit is connected to the exhaust port of the last-stage compression unit through the second bypass line. Under the single-stage compression mode, the refrigerant enters the first-stage compression unit through a suction port of the first-stage compression unit (namely, the suction port of the whole compressor), and then flows to a discharge port of the last-stage compression unit (namely, the discharge port of the whole compressor) through the second bypass pipeline to be discharged out of the compressor, so that the refrigerant is processed by the first-stage compression unit.
(2) If the designated compression unit is the last stage compression unit, the air suction port of the designated compression unit is connected to the air suction port of the first stage compression unit through a first bypass pipeline. Under the single-stage compression mode, the refrigerant enters the air suction port of the last-stage compression unit through the air suction port of the first-stage compression unit (namely, the air suction port of the whole compressor) and the first bypass pipeline and then is discharged out of the compressor through the air discharge port of the last-stage compression unit (namely, the air discharge port of the whole compressor), so that the refrigerant is processed by the last-stage compression unit.
(3) If the designated compression unit is an intermediate-stage compression unit (i.e., other compression units except the first-stage compression unit and the last-stage compression unit), the suction port of the designated compression unit is connected to the suction port of the first-stage compression unit through a first bypass line, and the discharge port of the designated compression unit is connected to the discharge port of the last-stage compression unit through a second bypass line. Under the single-stage compression mode, the refrigerant enters the air suction port of the appointed compression unit through the air suction port of the first-stage compression unit (namely, the air suction port of the whole compressor) and the first bypass pipeline, and then flows to the air exhaust port of the last-stage compression unit (namely, the air exhaust port of the whole compressor) through the air exhaust port of the appointed compression unit and the second bypass pipeline to be exhausted out of the compressor, so that the refrigerant is processed by the middle-stage compression unit.
In one embodiment, during the start-up phase of the train, the compressor is controlled to perform a single stage compression comprising: and controlling a bypass pipeline connected with the appointed compression unit to be in a communicated state.
If the designated compression unit is the first-stage compression unit, the bypass pipeline connected with the designated compression unit is the second bypass pipeline. If the designated compression unit is the last stage of compression unit, the bypass pipeline connected with the designated compression unit is the first bypass pipeline. If the designated compression unit is an intermediate-stage compression unit, the bypass pipeline connected with the designated compression unit is the first bypass pipeline and the second bypass pipeline.
The present embodiment enables the non-designated compression unit to be bypassed by controlling the bypass line to which the designated compression unit is connected to be in a communicated state, so as to achieve single-stage compression using the designated compression unit.
In one embodiment, controlling the compressor to switch from single stage compression to multi-stage compression comprises: and controlling a bypass pipeline connected with the appointed compression unit to be in a disconnected state. For the bypass line to which the designated compression unit is connected, reference is made to the previous description, and details are not repeated here.
The bypass pipeline connected with the appointed compression unit is controlled to be in a disconnected state, and no compression unit is bypassed, so that all compression units in the compressor can participate in refrigerant processing according to requirements, and multi-stage compression is realized.
In one embodiment, during the start-up phase of the unit, the compressor is controlled to perform multi-stage compression, including: and controlling a bypass pipeline connected with the appointed compression unit to be in a disconnected state. For the bypass line to which the designated compression unit is connected, reference is made to the previous description, and details are not repeated here.
The bypass pipeline connected with the appointed compression unit is controlled to be in a disconnected state, and no compression unit is bypassed, so that all compression units in the compressor can participate in refrigerant processing according to requirements, and multi-stage compression is realized.
Be provided with the tonifying qi mouth on the connecting line between the adjacent compression unit, the compressor includes at least one tonifying qi mouth promptly, and each tonifying qi mouth is connected to air supplement unit through tonifying qi pipeline respectively. The air supply device can supply air by using a flash evaporator or a plate heat exchanger. The ports are connected to different locations of the charge air device, taking into account the different refrigerant pressures required by the ports.
In one embodiment, during the start-up phase of the train, the compressor is controlled to perform a single stage compression comprising: and controlling the bypass pipeline connected with the appointed compression unit to be in a connected state, and controlling all the gas supplementing pipelines to be in a disconnected state. In the embodiment, the bypass pipeline connected with the appointed compression unit is controlled to be in a communicated state, so that the non-appointed compression unit is bypassed, the appointed compression unit is used for realizing single-stage compression, and all air supplement pipelines are controlled to be in a disconnected state under the single-stage compression mode, and the phenomenon that the refrigerant circulation quantity of the unit is influenced by meaningless air supplement operation is avoided.
In one embodiment, the compressor is controlled to switch from single-stage compression to multi-stage compression, or the compressor is controlled to perform multi-stage compression in a starting stage of the unit, and the method comprises the following steps: and controlling a bypass pipeline connected with the appointed compression unit to be in a disconnected state, and controlling the on-off of each air supplement pipeline according to the air supplement requirement. The bypass pipeline connected with the appointed compression unit is controlled to be in a disconnected state, no compression unit is bypassed, all compression units in the compressor can participate in refrigerant treatment according to requirements, multistage compression is achieved, on-off of each air supplementing pipeline is controlled according to air supplementing requirements under the multistage compression mode, and unit performance can be improved through air supplementing.
In one embodiment, the first bypass pipeline and the second bypass pipeline are respectively provided with a first on-off control element, the first on-off control element is used for controlling the on-off of the bypass pipeline, and the working mode of the compressor can be switched through the first on-off control element. In the embodiment, the on-off control element is arranged on the bypass pipeline, so that the on-off of the bypass pipeline can be simply and reliably controlled.
In one embodiment, each of the air supply pipelines is provided with a second on-off control element, and the second on-off control element is used for controlling the on-off of the air supply pipeline. Through second on-off control element, can control whether to supply air to the tonifying qi mouth that corresponds. The on-off control element is arranged on the air supply pipeline, so that the on-off of the air supply pipeline can be simply and reliably controlled.
The first on-off control element and the second on-off control element can be valves with on-off control functions, such as electromagnetic valves, electronic expansion valves and the like.
Example two
The present embodiment describes the above-mentioned compressor control method with reference to a specific example, however, it should be noted that this specific example is only for better describing the present application and should not be construed as a limitation to the present application. The same or corresponding terms as those of the above-described embodiments are explained, and the description of the present embodiment is omitted.
The present embodiment is described by taking an example that the compressor includes two compression units connected in sequence, and accordingly, the multi-stage compression mode of the compressor is specifically a two-stage compression mode. It can be understood that the compressor comprises three or more stages of compression units connected in sequence, the principle of the compressor is the same as that of the compressor comprising two stages of compression units, and details are not described again.
As shown in fig. 2, a schematic diagram of a single cooling unit (using flash evaporator for air supplement) is shown, the single cooling unit comprising: the air conditioner comprises a compressor 10, an outdoor heat exchanger 20, an indoor heat exchanger 30, a gas-liquid separator 40 and an air supplementing device. The compressor 10 is a two-stage compressor, and includes two-stage compression unit that connects gradually, first stage compression unit 11 and second stage compression unit 12 promptly, the induction port of first stage compression unit 11 is as the induction port of compressor 10, the gas vent of first stage compression unit 11 is connected with the induction port of second stage compression unit 12, the gas vent of second stage compression unit 12 is as the gas vent of compressor 10, be provided with the tonifying qi mouth on the connecting pipeline between the induction port of first stage compression unit 11 and second stage compression unit 12.
In this embodiment, the compression unit is designated as a first-stage compression unit 11, an exhaust port of the first-stage compression unit 11 is connected to an exhaust port of a second-stage compression unit 12 through a second bypass line, and a first control valve 60 (which is equivalent to the above-mentioned first on-off control element and may be an electromagnetic valve) is disposed on the second bypass line.
The air supplement unit includes: a first throttling element 51, a flash evaporator 52, a second throttling element 53, and a second control valve 54 (corresponding to the second on/off control element described above, and may be a solenoid valve). The first throttling element 51 performs primary throttling, the second throttling element 53 performs secondary throttling, and the first throttling element 51 and the second throttling element 52 may be elements having a throttling function such as an electronic expansion valve.
A first port of the flash evaporator 52 is connected to one port of the outdoor heat exchanger 20 through a first throttling element 51, a second port of the flash evaporator 52 is connected to one port of the indoor heat exchanger 30 through a second throttling element 53, and a third port of the flash evaporator 52 is connected to the supplementary air port of the compressor 10 through a second control valve 54.
The single cooling unit shown in FIG. 2 is set if the outdoor ambient temperature T Outer ring T1 ≦ T (for example, T1 ≦ 5 ℃), at the starting stage of the unit, the second control valve 54 is closed, the first control valve 60 is opened, single-stage compression operation is realized, at this time, the refrigerant directly bypasses the first control valve 60 after passing through the first-stage compression unit 11 to the exhaust port of the second-stage compression unit 12 to be discharged, the second-stage compression unit 12 is equivalent to a short circuit, and only the first-stage compression unit 11 operates. After the operation is performed for a period of time, when the exhaust superheat degree T is detected to be equal to or greater than T2 (for example, T2 is equal to 15 ℃), the first control valve 60 is closed, the compressor is switched from single-stage compression to double-stage compression, the opening and closing of the second control valve 54 are controlled according to the actual air supply requirement, and at the moment, the refrigerant is compressed by the first-stage compression unit 11 and then mixed with air supply to enter the second-stage compression unit 12 for secondary compression. Therefore, the purpose of controllable switching between single-stage compression and double-stage compression is achieved, and the problem of oil shortage caused by slow establishment of the superheat degree of the compressor during low-temperature starting is solved. Furthermore, if the outdoor ambient temperature T Outer ring And when the pressure is higher than T1, in the starting stage of the unit, the first control valve 60 is closed, the compressor 10 is enabled to operate according to double-stage compression, and the opening and closing of the second control valve 54 are controlled according to the actual air replenishing requirement.
As shown in fig. 3, which is a schematic view of a heat pump unit (using a flash evaporator to supplement air), compared with the single-cooling unit shown in fig. 2, the heat pump unit is further provided with a four-way valve 70 for switching the flow direction of the refrigerant between a cooling mode and a heating mode, in the cooling mode, a port C of the four-way valve is communicated with a port D, and a port S of the four-way valve is communicated with a port E; and in the heating mode, the port D of the four-way valve is communicated with the port E, and the port C is communicated with the port S. The control of the compressor 10 is the same as that of the chiller-only unit shown in fig. 2 and will not be described again here.
As shown in fig. 4, which is a schematic view of a single cooling unit (air make-up using a plate heat exchanger), the single cooling unit includes: the air conditioner comprises a compressor 10, an outdoor heat exchanger 20, an indoor heat exchanger 30, a gas-liquid separator 40 and an air supplementing device. The compressor 10 is a two-stage compressor, and includes two-stage compression unit that connects gradually, first stage compression unit 11 and second stage compression unit 12 promptly, the induction port of first stage compression unit 11 is as the induction port of compressor 10, the gas vent of first stage compression unit 11 is connected with the induction port of second stage compression unit 12, the gas vent of second stage compression unit 12 is as the gas vent of compressor 10, be provided with the tonifying qi mouth on the connecting pipeline between the induction port of first stage compression unit 11 and second stage compression unit 12.
In this embodiment, the compression unit is designated as a first-stage compression unit 11, an exhaust port of the first-stage compression unit 11 is connected to an exhaust port of a second-stage compression unit 12 through a second bypass line, and a first control valve 60 (which is equivalent to the above-mentioned first on-off control element and may be an electromagnetic valve) is disposed on the second bypass line.
The air supplement unit includes: a plate heat exchanger 55, a second control valve 54 (corresponding to the second on/off control element, which may be an electronic expansion valve) and a third throttling element 56. The third throttling element 56 may be an element having a throttling function such as an electronic expansion valve.
The plate heat exchanger 55 comprises four ports, a first port of the plate heat exchanger 55 is communicated with a second port of the plate heat exchanger 55, and a third port of the plate heat exchanger 55 is communicated with a fourth port of the plate heat exchanger 55. Specifically, a first port of the plate heat exchanger 55 is connected to one port of the outdoor heat exchanger 20, a second port of the plate heat exchanger 55 is connected to one port of the indoor heat exchanger 30 through a third throttling element 56, the first port of the plate heat exchanger 55 is further connected to a third port of the plate heat exchanger 55 through a second control valve 54, and a fourth port of the plate heat exchanger 55 is connected to the air supplement port of the compressor 10.
The single cooling unit shown in FIG. 4 is set if the outdoor ambient temperature T Outer ring T1 ≤ (such as T1 ═ 5 deg.C), at the start stage of the unit, the second control valve 54 is closed, the first control valve 60 is opened, single-stage compression operation is realized, and refrigerant is compressed by the first stageThe unit 11 is directly bypassed to the exhaust port of the second stage compression unit 12 through the first control valve 60 and exhausted, the second stage compression unit 12 is equivalent to a short circuit, and only the first stage compression unit 11 operates. After the operation is performed for a period of time, when the detected discharge superheat degree T is greater than or equal to T2 (for example, T2 is 15 ℃), the first control valve 60 is closed, the compressor is switched from single-stage compression to double-stage compression, and the opening and closing of the second control valve 54 are controlled according to the actual gas supplementing requirement, at this time, the refrigerant is compressed by the first-stage compression unit 11, mixed with the gas supplementing, and enters the second-stage compression unit 12 for second-stage compression. Therefore, the purpose of controllable switching between single-stage compression and double-stage compression is achieved, and the problem of oil shortage caused by slow establishment of the superheat degree of the compressor during low-temperature starting is solved. Furthermore, if the outdoor ambient temperature T Outer ring And when the pressure is higher than T1, in the starting stage of the unit, the first control valve 60 is closed, the compressor 10 is enabled to operate according to double-stage compression, and the opening and closing of the second control valve 54 are controlled according to the actual air replenishing requirement.
As shown in fig. 5, which is a schematic diagram of a heat pump unit (utilizing a plate heat exchanger for air supplement), compared with the single-cold-unit of fig. 4, the heat pump unit is further provided with a four-way valve 70 and a fourth throttling element 57. The four-way valve 70 is used for switching the refrigerant flow direction of a refrigeration mode and a heating mode, and in the refrigeration mode, a port C of the four-way valve is communicated with a port D, and a port S of the four-way valve is communicated with a port E; and in the heating mode, the port D of the four-way valve is communicated with the port E, and the port C is communicated with the port S. The fourth throttling element 57 may be an element having a throttling function such as an electronic expansion valve. For the heat pump unit, the third throttling element 56 is used as a refrigeration throttling element, that is, the third throttling element 56 performs throttling in the refrigeration mode; the fourth throttling element 57 functions as a heating throttling element, i.e., the fourth throttling element 57 throttles in the heating mode. The control of the compressor 10 is the same as that of the chiller unit shown in fig. 4 and will not be described again here.
As shown in fig. 6, the compressor controlling method includes the steps of:
s601, detecting the outdoor environment temperature T Outer ring 。
S602, if T Outer ring T1 ≦ T (e.g., T1 ≦ -5 ℃), during the start-up phase of the unit, the second control valve 54 is closed and the first control valve 60 is opened.
And S603, after the compressor runs for a period of time, when the superheat degree T of the exhaust gas is detected to be more than or equal to T2 (for example, T2 is 15 ℃), the first control valve 60 is closed, the compressor is switched from single-stage compression to double-stage compression, and the second control valve 54 is controlled to be opened and closed according to the actual gas supplementing requirement.
S604, if T Outer ring And when the pressure is higher than T1, in the starting stage of the unit, the first control valve 60 is closed, the compressor 10 is enabled to operate according to double-stage compression, and the opening and closing of the second control valve 54 are controlled according to the actual air replenishing requirement.
The embodiment provides a scheme capable of switching a single-stage compression mode and a multi-stage compression mode of a compressor, and the single-stage compression operation is carried out at the starting stage of a unit under the low-temperature working condition through the accurate switching control of the single-stage compression and the multi-stage compression, so that the superheat degree can be quickly established, and the oil shortage caused by slow establishment of the superheat degree is avoided; after the superheat degree is established, switching can be performed to multi-stage compression, the capacity requirement of the unit is met, and for example, the ultralow-temperature heating capacity is guaranteed not to be attenuated.
EXAMPLE III
The embodiment provides a unit, which includes a compressor, the compressor includes at least two stages of compression units connected in sequence, the compression unit for single-stage compression in the at least two stages of compression units is marked as a designated compression unit, the suction port of the designated compression unit is connected to the suction port of the first stage of compression unit through a first bypass pipeline, and/or the exhaust port of the designated compression unit is connected to the exhaust port of the last stage of compression unit through a second bypass pipeline.
If the bypass pipeline connected with the appointed compression unit is in a communicated state, the compressor performs single-stage compression; if the bypass pipeline connected with the appointed compression unit is in a disconnected state, the compressor performs multi-stage compression. That is, the first bypass line and the second bypass line are used to switch the compressor to perform single-stage compression or multi-stage compression.
In the embodiment, the bypass pipeline connected with the compression unit is appointed, so that the single-stage compression mode and the multi-stage compression mode of the compressor can be accurately switched and controlled, the compressor can operate according to the single-stage compression mode in the starting stage of the unit under the low-temperature working condition, the exhaust temperature of the single-stage compression is higher than that of the multi-stage compression, the speed for establishing the superheat degree is accelerated, the superheat degree can be quickly established, and the condition that the compressor is lack of oil due to slow establishment of the superheat degree is avoided; after the superheat degree is established, the compressor can be switched to a multi-stage compression mode to operate, and the capacity requirement of the unit is met.
Optionally, the first bypass pipeline and the second bypass pipeline are both provided with a first on-off control element.
Optionally, a connecting pipeline between adjacent compression units is provided with an air supplement port, and each air supplement port is connected to the air supplement device through an air supplement pipeline.
Optionally, each air supply pipeline is provided with a second on-off control element.
For details of the technology not described in detail in this embodiment, reference may be made to the description of the first embodiment of the present invention.
Example four
Based on the same inventive concept, the present embodiment provides a compressor control apparatus, which can be used to implement the compressor control method described in the above embodiments. The compressor control device, which may be implemented by software and/or hardware, may typically be integrated into the control unit of the unit. The compressor of the present embodiment includes at least two stages of compression units connected in series.
Fig. 7 is a block diagram showing a configuration of a compressor control apparatus according to a fourth embodiment of the present invention, and as shown in fig. 7, the compressor control apparatus includes:
an obtaining module 71, configured to obtain an outdoor ambient temperature;
the first control module 72 is configured to control the compressor to perform single-stage compression in a unit start-up stage if the outdoor ambient temperature is less than or equal to a first preset temperature.
Optionally, the first control module 72 is specifically configured to: controlling a bypass pipeline connected with the appointed compression unit to be in a communicated state; the appointed compression unit is used for single-stage compression in at least two stages of compression units, a suction port of the appointed compression unit is connected to a suction port of the first stage compression unit through a first bypass pipeline, and/or an exhaust port of the appointed compression unit is connected to an exhaust port of the last stage compression unit through a second bypass pipeline.
Optionally, the compressor includes at least one air supplement port, at least one the air supplement port is connected to air supplement device through the air supplement pipeline respectively. The first control module 72 is further configured to: and controlling all the air supplement pipelines to be in a disconnected state.
Optionally, the compressor control device further comprises: and the second control module is used for controlling the compressor to be switched from single-stage compression to multi-stage compression when the superheat degree parameter meets the preset requirement after the compressor is controlled to carry out single-stage compression.
Optionally, the second control module is specifically configured to: controlling a bypass pipeline connected with the appointed compression unit to be in a disconnected state; the appointed compression unit is used for single-stage compression in at least two stages of compression units, a suction port of the appointed compression unit is connected to a suction port of the first stage compression unit through a first bypass pipeline, and/or an exhaust port of the appointed compression unit is connected to an exhaust port of the last stage compression unit through a second bypass pipeline.
Optionally, the second control module is specifically configured to: and determining that the superheat degree parameter meets the preset requirement under the condition that the exhaust superheat degree is greater than or equal to a second preset temperature and/or the oil temperature superheat degree is greater than or equal to a third preset temperature.
Optionally, the compressor control device further includes: and the third control module is used for controlling the compressor to perform multi-stage compression in the unit starting stage if the outdoor environment temperature is higher than the first preset temperature after the outdoor environment temperature is acquired.
Optionally, the third control module is specifically configured to: controlling a bypass pipeline connected with the appointed compression unit to be in a disconnected state; the appointed compression unit is used for single-stage compression in at least two stages of compression units, a suction port of the appointed compression unit is connected to a suction port of the first stage compression unit through a first bypass pipeline, and/or an exhaust port of the appointed compression unit is connected to an exhaust port of the last stage compression unit through a second bypass pipeline.
Optionally, the first bypass pipeline and the second bypass pipeline are both provided with a first on-off control element.
Optionally, each of the air supply pipelines is provided with a second on-off control element.
The compressor control device can execute the compressor control method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. For details of the compressor control method provided in the embodiment of the present invention, reference may be made to the technical details that are not described in detail in the embodiment.
This embodiment still provides a unit, includes: the compressor control device is provided.
EXAMPLE five
The present embodiment provides an electronic device, including: the system comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the method of the embodiment.
EXAMPLE six
The present embodiment provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of the above-described embodiment.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (14)
1. A compressor control method, the compressor including at least two stages of compression units connected in series, the compressor control method comprising:
acquiring the outdoor environment temperature;
if the outdoor environment temperature is less than or equal to a first preset temperature, controlling the compressor to perform single-stage compression in a unit starting stage;
the compressor comprises at least one air supplementing port, and the at least one air supplementing port is connected to an air supplementing device through an air supplementing pipeline respectively;
in the starting stage of the unit, the compressor is controlled to perform single-stage compression, and the method comprises the following steps:
and controlling all the air supplement pipelines to be in a disconnected state.
2. The compressor control method according to claim 1, wherein the compressor is controlled to perform single-stage compression at a start-up stage of the train, including:
controlling a bypass pipeline connected with the appointed compression unit to be in a communicated state;
the appointed compression unit is used for single-stage compression in at least two stages of compression units, a suction port of the appointed compression unit is connected to a suction port of the first stage compression unit through a first bypass pipeline, and/or an exhaust port of the appointed compression unit is connected to an exhaust port of the last stage compression unit through a second bypass pipeline.
3. The compressor control method according to claim 1, further comprising, after controlling the compressor to perform single-stage compression:
and when the superheat degree parameter meets the preset requirement, controlling the compressor to be switched from single-stage compression to multi-stage compression.
4. The compressor control method according to claim 3, wherein controlling the compressor to switch from single-stage compression to multi-stage compression comprises:
controlling a bypass pipeline connected with the appointed compression unit to be in a disconnected state;
the appointed compression unit is used for single-stage compression in at least two stages of compression units, a suction port of the appointed compression unit is connected to a suction port of the first stage compression unit through a first bypass pipeline, and/or an exhaust port of the appointed compression unit is connected to an exhaust port of the last stage compression unit through a second bypass pipeline.
5. A compressor control method as set forth in claim 3, characterized in that the superheat degree parameter satisfies a preset requirement, including:
the exhaust superheat degree is greater than or equal to a second preset temperature, and/or the oil temperature superheat degree is greater than or equal to a third preset temperature.
6. The compressor control method according to claim 1, further comprising, after acquiring the outdoor ambient temperature:
and if the outdoor environment temperature is higher than the first preset temperature, controlling the compressor to perform multi-stage compression in the unit starting stage.
7. The compressor control method according to claim 6, wherein the compressor is controlled to perform multi-stage compression in a starting stage of the unit, including:
controlling a bypass pipeline connected with the appointed compression unit to be in a disconnected state;
the appointed compression unit is used for single-stage compression in at least two stages of compression units, a suction port of the appointed compression unit is connected to a suction port of the first stage compression unit through a first bypass pipeline, and/or an exhaust port of the appointed compression unit is connected to an exhaust port of the last stage compression unit through a second bypass pipeline.
8. The compressor control method according to any one of claims 2, 4, and 7, wherein a first on-off control element is provided on each of the first bypass line and the second bypass line.
9. The compressor control method according to claim 1, wherein a second on-off control element is provided on each of the air supply lines.
10. A unit comprising a compressor comprising at least two stages of compression units connected in series, characterized in that,
the compression unit used for single-stage compression in at least two stages of compression units is marked as a designated compression unit, the air suction port of the designated compression unit is connected to the air suction port of the first stage compression unit through a first bypass pipeline, and/or the air exhaust port of the designated compression unit is connected to the air exhaust port of the last stage compression unit through a second bypass pipeline;
if the bypass pipeline connected with the specified compression unit is in a communicated state, the compressor performs single-stage compression;
if the bypass pipeline connected with the specified compression unit is in a disconnected state, the compressor performs multi-stage compression;
the compressor is used for compressing the air in a single stage, and the air supplementing pipelines are all in a disconnected state.
11. The aggregate according to claim 10, characterized in that a first on-off control element is provided on each of said first bypass line and said second bypass line.
12. The assembly according to claim 10, characterized in that each of said air-supply lines is provided with a second on-off control element.
13. An electronic device, comprising: memory, processor and computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 9 when executing the computer program.
14. A non-transitory computer readable storage medium, having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method of any of claims 1 to 9.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06337174A (en) * | 1993-05-28 | 1994-12-06 | Daikin Ind Ltd | Operation controller for air-conditioner |
| CN2884061Y (en) * | 2005-12-23 | 2007-03-28 | 中国科学院理化技术研究所 | Parallel compressor low-temperature air source heat pump device capable of realizing two-stage compression |
| JP2007178120A (en) * | 2007-03-29 | 2007-07-12 | Mitsubishi Electric Corp | Refrigerator-freezer |
| CN109185094A (en) * | 2018-08-17 | 2019-01-11 | 珠海格力电器股份有限公司 | Method and device for controlling cylinder cutting of compressor, unit and air conditioning system |
| WO2019094483A1 (en) * | 2017-11-08 | 2019-05-16 | Emerson Climate Technologies, Inc. | Control mechanism for climate control unit with multiple stages |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100531296B1 (en) * | 2003-08-01 | 2005-11-28 | 엘지전자 주식회사 | method for controlling system in air conditioner |
-
2021
- 2021-08-24 CN CN202110976156.3A patent/CN113776243B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06337174A (en) * | 1993-05-28 | 1994-12-06 | Daikin Ind Ltd | Operation controller for air-conditioner |
| CN2884061Y (en) * | 2005-12-23 | 2007-03-28 | 中国科学院理化技术研究所 | Parallel compressor low-temperature air source heat pump device capable of realizing two-stage compression |
| JP2007178120A (en) * | 2007-03-29 | 2007-07-12 | Mitsubishi Electric Corp | Refrigerator-freezer |
| WO2019094483A1 (en) * | 2017-11-08 | 2019-05-16 | Emerson Climate Technologies, Inc. | Control mechanism for climate control unit with multiple stages |
| CN109185094A (en) * | 2018-08-17 | 2019-01-11 | 珠海格力电器股份有限公司 | Method and device for controlling cylinder cutting of compressor, unit and air conditioning system |
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