CN108131859B - Air conditioning system of variable capacity compressor, control method of air conditioning system, storage medium and processor - Google Patents
Air conditioning system of variable capacity compressor, control method of air conditioning system, storage medium and processor Download PDFInfo
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- CN108131859B CN108131859B CN201711421446.1A CN201711421446A CN108131859B CN 108131859 B CN108131859 B CN 108131859B CN 201711421446 A CN201711421446 A CN 201711421446A CN 108131859 B CN108131859 B CN 108131859B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004378 air conditioning Methods 0.000 title claims abstract description 34
- 238000006073 displacement reaction Methods 0.000 claims abstract description 54
- 238000004891 communication Methods 0.000 claims abstract description 13
- 230000002159 abnormal effect Effects 0.000 abstract description 15
- 239000010687 lubricating oil Substances 0.000 description 19
- 239000003507 refrigerant Substances 0.000 description 13
- 239000007788 liquid Substances 0.000 description 7
- 239000010726 refrigerant oil Substances 0.000 description 7
- 230000001502 supplementing effect Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000007774 longterm 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
Classifications
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B31/00—Compressor 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
-
- 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
- F25B2600/25—Control of valves
- F25B2600/2519—On-off valves
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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
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)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
The application discloses an air conditioning system of a variable capacity compressor, a control method thereof, a storage medium and a processor. Wherein, this positive displacement compressor's air conditioning system includes: a compressor; the variable capacity cavity is connected with the compressor; the first end of the first switch control valve is connected with the high-pressure exhaust channel, and the second end of the first switch control valve is connected with the suction inlet of the variable-volume cavity and used for controlling the communication and disconnection of the variable-volume cavity and the high-pressure exhaust channel; the first end of the second switch control valve is connected with the low-pressure air suction channel, the second end of the second switch control valve is connected with the suction inlet of the variable-volume cavity and used for controlling the communication and the disconnection of the variable-volume cavity and the low-pressure air suction channel, and the variable-volume cavity is kept to be simultaneously communicated with the high-pressure air discharge channel and the low-pressure air suction channel before the displacement of the compressor is switched. The application solves the technical problem that the displacement of the variable-capacity compressor is abnormal when being switched.
Description
Technical Field
The application relates to the field of air conditioners, in particular to an air conditioning system of a variable-capacity compressor, a control method of the air conditioning system, a storage medium and a processor.
Background
The variable-volume cavity is a necessary component for realizing displacement switching of the variable-volume compressor, the compressor is in a large-displacement mode operation when the pressure in the variable-volume cavity is high pressure, and the compressor is in a small-displacement mode operation when the pressure in the variable-volume cavity is low pressure. The variable-volume cavity of the variable-volume compressor accumulates lubricating oil and liquid refrigerant, which can cause abnormal displacement switching, namely switching failure or abnormal noise, and long-term occurrence can cause abrasion of parts of the compressor, thereby affecting the reliability of the compressor.
The main reasons for the variable volume cavity to collect lubricating oil and liquid refrigerant are as follows:
(1) The reason for the oil accumulation in the variable volume cavity in the two-cylinder operation stage is as follows: the compressor runs in a two-cylinder mode with small displacement, and the variable-volume channel is communicated with the air suction channel and is in a system low-pressure state. The compressor chamber is in a high pressure state, and the lubricating oil and the refrigerant in the compressor chamber can migrate to the variable capacity channel due to pressure difference.
(2) The reason for the oil accumulation in the variable volume cavity in the shutdown stage is as follows: the compressor is arranged on the outer side of the room, and when the outdoor working condition is lower than the indoor working condition, the refrigerant in the air conditioning system can migrate to the outer side, so that the variable volume cavity and the connecting pipe thereof accumulate the refrigerant and the lubricating oil.
The two cylinders are cut into the three cylinders at the moment of large discharge capacity due to the large quantity of the refrigerant and the lubricating oil in the variable-volume cavity, so that the reliability problems of unsuccessful switching, abnormal noise generation and the like are caused.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the application provides an air conditioning system of a variable-capacity compressor, a control method thereof, a storage medium and a processor, which are used for at least solving the technical problem that the variable-capacity compressor is abnormal when the displacement of the variable-capacity compressor is switched.
According to an aspect of an embodiment of the present application, there is provided an air conditioning system of a variable capacity compressor, including: a compressor; the variable capacity cavity is connected with the compressor; the first end of the first switch control valve is connected with a high-pressure exhaust channel, and the second end of the first switch control valve is connected with a suction inlet of the variable-volume cavity and used for controlling the communication and disconnection of the variable-volume cavity and the high-pressure exhaust channel; the first end of the second switch control valve is connected with the low-pressure air suction channel, and the second end of the second switch control valve is connected with the suction inlet of the variable-volume cavity and used for controlling the communication and the disconnection of the variable-volume cavity and the low-pressure air suction channel, wherein before the displacement of the compressor is switched, the variable-volume cavity is kept to be simultaneously communicated with the high-pressure air discharge channel and the low-pressure air suction channel.
Further, the distance between the suction inlet and the connecting point is smaller than or equal to 50mm, wherein the connecting point is a point where the second end of the second switch control valve is connected with the variable-volume cavity.
Further, the first switch control valve is a high-pressure electromagnetic two-way valve, and the second switch control valve is a low-pressure electromagnetic two-way valve.
Further, before the compressor performs displacement switching, the second switch control valve and the first switch control valve are controlled to be in an open state, wherein when the second switch control valve and the first switch control valve are in an open state, the variable volume cavity is connected with the low pressure suction channel and the high pressure discharge channel.
Further, before the compressor performs displacement switching, the second switch control valve is kept in a conducting state, the first switch control valve is kept in a closing state, and after a period of time, the first switch control valve is opened.
Further, after the first switching control valve is opened for a period of time, the second switching control valve is closed.
Further, after the compressor is stopped, the second switch control valve is in a closed state and the first switch control valve is in an open state, wherein when the second switch control valve is in the closed state, the variable volume cavity and the low-pressure air suction channel are in a disconnected state, and when the first switch control valve is in the open state, the variable volume cavity and the high-pressure air discharge channel are in a communicated state.
According to another aspect of the embodiment of the present application, there is also provided a control method of an air conditioning system of a variable capacity compressor, including: detecting whether the variable-capacity compressor meets a switching condition for switching from a small-displacement operation mode to a large-displacement operation mode; when the variable-capacity compressor meets the switching condition, the variable-capacity cavity of the variable-capacity compressor is controlled to be communicated with the low-pressure air suction channel, and the variable-capacity cavity is controlled to be communicated with the high-pressure air discharge channel.
Further, controlling the variable-volume chamber of the variable-volume compressor to communicate with the low-pressure suction channel, and controlling the variable-volume chamber to communicate with the high-pressure discharge channel includes: and after the variable-volume cavity of the variable-volume compressor is controlled to be communicated with the low-pressure air suction channel for a first time period, the variable-volume cavity is controlled to be communicated with the high-pressure air discharge channel.
Further, after controlling the variable volume chamber to communicate with the high-pressure exhaust passage, the control method further includes: and after the variable volume cavity is communicated with the high-pressure exhaust channel for a second time period, the variable volume cavity is controlled to be disconnected with the low-pressure air suction channel, wherein in the second time period, the refrigerant and lubricating oil stored in the variable volume cavity and the connecting pipeline thereof are completely discharged to the air suction channel.
Further, after the switching condition that the variable-capacity compressor is switched from the small-displacement operation mode to the large-displacement operation mode, the method further includes: and after the variable-volume compressor is stopped, controlling the variable-volume cavity to be disconnected with the low-pressure air suction channel, and keeping the variable-volume cavity to be communicated with the high-pressure air discharge channel.
Further, after maintaining the variable volume chamber in communication with the high pressure exhaust passage, the control method further includes: and after a period of time, controlling the variable volume cavity and the high-pressure exhaust channel to be closed.
According to another aspect of the embodiments of the present application, there is also provided a storage medium including a stored program, wherein the program executes the control method of the air conditioning system of the variable capacity compressor described above.
According to another aspect of the embodiment of the present application, there is also provided a processor, configured to run a program, where the program runs to execute the control method of the air conditioning system of the variable capacity compressor.
In the embodiment of the application, before the displacement switching is performed, the first switch control valve A and the second switch control valve B are in a conducting state, so that the variable-volume cavity is communicated with the high-pressure exhaust channel and the low-pressure suction channel, lubricating oil and liquid refrigerant accumulated in the variable-volume cavity and the connecting channel thereof are discharged to the suction side of the compressor by utilizing high-low pressure difference, and then the displacement switching of the compressor is performed, thereby ensuring the smooth completion of the displacement switching, avoiding abnormal noise in the switching process and achieving the technical problem of avoiding abnormal displacement switching.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
fig. 1 is a schematic view of an air conditioning system of a variable capacity compressor according to an embodiment of the present application;
fig. 2 is a schematic view of an air conditioning system of a variable capacity compressor according to a preferred embodiment of the present application;
fig. 3 is a flowchart of a control method of an air conditioning system of a variable capacity compressor according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise 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.
The embodiment of the application provides an air conditioning system of a variable-capacity compressor. Fig. 1 is a schematic view of an air conditioning system of a variable capacity compressor according to an embodiment of the present application.
As shown in fig. 1, the air conditioning system of the variable capacity compressor includes:
a compressor 1;
the variable volume cavity 2 is connected with the compressor 1;
the first end of the first switch control valve A is connected with the high-pressure exhaust channel 3, and the second end of the first switch control valve A is connected with the suction inlet of the variable volume cavity 2 and used for controlling the communication and disconnection of the variable volume cavity 2 and the high-pressure exhaust channel 3;
a second switch control valve B, a first end of the second switch control valve B is connected with the low-pressure air suction channel 4, a second end of the second switch control valve B is connected with the suction inlet of the variable volume cavity 2 and is used for controlling the communication and the disconnection of the variable volume cavity 2 and the low-pressure air suction channel 4,
wherein the holding capacity variable cavity 2 communicates with both the high pressure discharge passage 3 and the low pressure suction passage 4 before the displacement switching of the compressor 1.
The first switch control valve A can control the communication and the disconnection of the variable capacitance cavity 2 and the high-pressure exhaust channel 3; when the first switch control valve A is opened, the variable volume cavity 2 is communicated with the high-pressure exhaust channel 3; when the first switch control valve A is closed, the variable volume cavity 2 is disconnected from the high-pressure exhaust channel 3.
The second switch control valve B can control the communication and the disconnection of the variable volume cavity 2 and the low-pressure air suction channel 4; when the second switch control valve B is opened, the variable volume cavity 2 and the low-pressure air suction channel 4; when the second switch control valve B is closed, the variable volume cavity 2 is disconnected from the low-pressure air suction channel 4. The distance between the suction inlet and the connecting point is smaller than or equal to 50mm, wherein the connecting point is a point at which the second end of the second switch control valve is connected with the variable-volume cavity. Because the distance between the connecting point and the suction inlet is small, the lubricating oil and the refrigerant between the connecting point and the suction inlet can be avoided.
In order to avoid the problems that liquid refrigerant and lubricating oil stored in a variable-volume cavity cause unsuccessful switching or abnormal noise is generated when the compressor performs displacement switching, before the displacement switching is performed, a first switch control valve A and a second switch control valve B are in a conducting state, so that the variable-volume cavity is communicated with a high-pressure exhaust channel and is communicated with a low-pressure air suction channel, the lubricating oil and the liquid refrigerant accumulated in the variable-volume cavity and a connecting channel thereof are discharged to the air suction side of the compressor by utilizing high-low pressure difference, the displacement switching of the compressor is performed, smooth completion of the displacement switching is ensured, abnormal noise is generated in the switching process is avoided, and the technical problem of abnormal displacement switching is solved.
Optionally, the first switch control valve a is a high-pressure electromagnetic two-way valve. The second switch control valve B is a low-pressure electromagnetic two-way valve. That is, before the displacement switching of the compressor 1, both the low-pressure electromagnetic two-way valve B and the high-pressure electromagnetic two-way valve a are controlled to be in an open state, wherein the variable volume chamber 2 connects the low-pressure suction passage 4 and the high-pressure discharge passage 3 when the low-pressure electromagnetic two-way valve B and the high-pressure electromagnetic two-way valve a are in an open state.
Optionally, before the displacement of the compressor 1 is switched, the low-pressure electromagnetic two-way valve is kept in a conducting state, and the high-pressure electromagnetic two-way valve is kept in a closing state, and after a period of time, the high-pressure electromagnetic two-way valve A is opened. After the high-pressure electromagnetic two-way valve is opened for a period of time, the high-pressure electromagnetic two-way valve is in a closed state.
When the compressor is judged to meet the condition that the small-displacement mode is switched to the large-displacement mode, the low-pressure electromagnetic two-way valve B is maintained in an electrified state to keep the low-pressure electromagnetic two-way valve on, and the purpose is to enable one side of the variable-volume cavity 2 to be communicated with low pressure. After the time T1, the high-pressure electromagnetic two-way valve A is electrified to conduct the high-pressure electromagnetic two-way valve, so that the variable capacitance cavity 2 is communicated with high pressure. The variable volume chamber 2 is connected with the high pressure at the exhaust side and the low pressure at the suction side of the compressor, and the difference between the high pressure and the low pressure enables the refrigerant and lubricating oil stored in the variable volume chamber and the connecting pipeline thereof to be discharged to the suction channel. After the high-pressure electromagnetic two-way valve A is electrified for T2 time, the high-pressure electromagnetic two-way valve A is closed, and the T2 time is the time required by discharging the refrigerant and lubricating oil stored in the variable-volume cavity 2 and a connecting pipeline thereof to an air suction channel.
Optionally, after the compressor 1 is stopped, the second switch control valve B is in a closed state and the first switch control valve a is in an open state, where when the second switch control valve B is in the closed state, the variable volume chamber 2 and the low pressure suction channel 4 are in the closed state, and when the first switch control valve a is in the open state, the variable volume chamber 2 and the high pressure discharge channel 3 are in the communicating state.
After the compressor is shut down, the low-pressure electromagnetic two-way valve is powered off to cut off the connection between the variable-volume cavity and the low-pressure air suction channel, and meanwhile, the high-pressure electromagnetic two-way valve is powered on to enable the variable-volume cavity to be communicated with the high-pressure air discharge channel, so that the purpose of communicating the high-pressure air discharge channel with the variable-volume cavity 2 is achieved, the pressure in the variable-volume cavity and the pressure in the compressor cavity are balanced, and lubricating oil and refrigerant in the compressor cavity are prevented from migrating to the variable-volume cavity channel after the compressor is shut down. After a period of time, the high-voltage electromagnetic two-way valve A is powered off.
The application can solve the problems of displacement switching failure and abnormal noise generation of the variable-capacity compressor and improve the reliability of the compressor.
Fig. 2 is a schematic view of an air conditioning system of a variable capacity compressor according to a preferred embodiment of the present application. As shown in fig. 2, the air conditioning system of the variable capacity compressor further includes:
the gas-liquid separator 5, the compressor 1 is connected to the low-pressure suction passage through the gas-liquid separator 5, and is not connected through the second on-off control valve B. The compressor 1 is also connected to a make-up air channel 6. The four-way valve 7 connects the low-pressure suction passage 4 and the high-pressure discharge passage 3, and also connects the indoor side heat exchanger 8, and the outdoor side heat exchanger 11. The air supplementing channel 6 is also connected with an air supplementing electromagnetic two-way valve 10, one side of the air supplementing channel 6 is connected with the compressor 1, the other side is connected with the flash evaporator 9, the flash evaporator 9 is also connected with the indoor side heat exchanger 8 through the electronic expansion valve C, and the flash evaporator 9 is connected with the outdoor side heat exchanger 11 through the electronic expansion valve D.
Fig. 3 is a control method of an air conditioning system of a variable capacity compressor according to an embodiment of the present application, as shown in fig. 3, the method including the steps of:
step S302, detecting whether the variable-capacity compressor meets a switching condition for switching from a small-displacement operation mode to a large-displacement operation mode;
and step S304, when the variable-capacity compressor meets the switching condition, controlling the variable-capacity cavity of the variable-capacity compressor to be communicated with the low-pressure air suction channel and controlling the variable-capacity cavity to be communicated with the high-pressure air discharge channel.
In order to avoid the problems that when the compressor performs displacement switching, the refrigerant and the lubricating oil stored in the variable-volume cavity cause switching failure or abnormal noise is generated, and the like, before the displacement switching is performed, the first switch control valve A and the second switch control valve B are in a conducting state, so that the variable-volume cavity is communicated with a high-pressure exhaust channel and is communicated with a low-pressure air suction channel, the lubricating oil and the refrigerant accumulated in the variable-volume cavity and a connecting channel thereof are discharged to the air suction side of the compressor by utilizing high-low pressure difference, the displacement switching of the compressor is performed, the smooth completion of the displacement switching is ensured, abnormal noise is generated in the switching process is avoided, and the technical problem of abnormal displacement switching is solved.
Optionally, controlling the variable-volume chamber of the variable-volume compressor to communicate with the low-pressure suction channel, and controlling the variable-volume chamber to communicate with the high-pressure discharge channel includes: the variable-volume cavity of the variable-volume compressor is controlled to be communicated with the low-pressure air suction channel for a first time period, and then the variable-volume cavity is controlled to be communicated with the high-pressure air discharge channel. The variable volume cavity 2 is connected with a low-pressure air suction channel, and then the variable volume cavity 2 is connected with a high-pressure air discharge channel, at the moment, the variable volume cavity is simultaneously communicated with high pressure at the air discharge side and low pressure at the air suction side of the compressor, and the high-low pressure difference enables the refrigerant and lubricating oil stored in the variable volume cavity and a connecting pipeline thereof to be discharged to the air suction channel.
Optionally, after the control variable volume chamber is communicated with the high-pressure exhaust passage, the control method further comprises: and after the variable volume cavity is communicated with the high-pressure exhaust channel for a second time period, the variable volume cavity is controlled to be disconnected with the low-pressure air suction channel. In the second time period, the refrigerant and lubricating oil stored in the variable volume cavity and the connecting pipeline thereof are discharged to the low-pressure air suction channel.
After the refrigerant and lubricating oil in the variable-volume cavity are discharged to the suction channel, the displacement of the variable-volume cavity can be switched. The compressor is in a large-displacement mode when the pressure in the variable-volume cavity is high, and is in a small-displacement mode when the pressure in the variable-volume cavity is low. In order to switch the displacement, the connection between the variable-volume cavity and the low-pressure air suction channel is required to be disconnected, the intra-cavity pressure of the variable-volume cavity 2 is increased, so that the pressure of the variable-volume cavity 2 is high, and the compressor is switched to a large-displacement operation mode.
Optionally, after the switching condition that the variable-capacity compressor switches from the small-displacement operation mode to the large-displacement operation mode, the method further includes: after the variable-volume compressor is stopped, the variable-volume cavity is controlled to be disconnected with the low-pressure air suction channel, and the variable-volume cavity is kept to be communicated with the high-pressure air discharge channel. After the variable volume cavity is kept communicated with the high-pressure exhaust channel, the variable volume cavity and the high-pressure exhaust channel are controlled to be shut off after a period of time.
After the compressor 1 is shut down, the second switch control valve B is powered off to cut off the variable volume cavity 2 and the low-pressure air suction channel 4, meanwhile, the first switch control valve A is powered on to enable the variable volume cavity 2 to be communicated with the high-pressure air discharge channel 3, the purpose is to enable the variable volume cavity 2 to be communicated with the high-pressure air discharge channel 3, the pressure in the variable volume cavity 2 and the pressure in the cavity of the compressor 1 are balanced, and lubricating oil and refrigerant in the cavity of the compressor are prevented from migrating to the variable volume cavity channel after the compressor is shut down. After the pressure in the variable volume cavity 2 and the pressure in the cavity of the compressor 1 reach balance for a period of time, the first switch control valve A is powered off and closed.
The application can solve the problems of displacement switching failure and abnormal noise generation of the variable-capacity compressor and improve the reliability of the compressor.
The embodiment of the application also provides a storage medium, which comprises a stored program, wherein the program executes the control method of the air conditioning system of the variable-capacity compressor.
The embodiment of the application also provides a processor, which is used for running a program, wherein the control method of the air conditioning system of the variable-capacity compressor is executed when the program runs.
In the several embodiments provided in the present application, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
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 units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.
Claims (12)
1. An air conditioning system of a variable capacity compressor, comprising:
a compressor;
the variable capacity cavity is connected with the compressor;
the first end of the first switch control valve is connected with a high-pressure exhaust channel, and the second end of the first switch control valve is connected with a suction inlet of the variable-volume cavity and used for controlling the communication and disconnection of the variable-volume cavity and the high-pressure exhaust channel;
a second switch control valve, the first end of the second switch control valve is connected with a low-pressure air suction channel, the second end of the second switch control valve is connected with the suction inlet of the variable-volume cavity and used for controlling the communication and the disconnection of the variable-volume cavity and the low-pressure air suction channel,
before the displacement of the compressor is switched, the variable-volume cavity is kept to be communicated with the high-pressure exhaust channel and the low-pressure suction channel simultaneously;
after the compressor is stopped, the second switch control valve is in a closed state and the first switch control valve is in an open state, wherein when the second switch control valve is in the closed state, the variable volume cavity and the low-pressure air suction channel are in a disconnected state, and when the first switch control valve is in the open state, the variable volume cavity and the high-pressure air discharge channel are in a communicated state.
2. The air conditioning system of claim 1, wherein the suction inlet is less than or equal to 50mm from a connection point, wherein the connection point is a point where the second end of the second switching control valve is connected to the variable volume chamber.
3. The air conditioning system according to claim 1, wherein the first and second on-off control valves are both controlled to be in an open state before the displacement switching of the compressor, wherein the variable volume chamber connects the low pressure suction passage and the high pressure discharge passage when the second and first on-off control valves are in an open state.
4. The air conditioning system according to claim 3, wherein the second switching control valve is maintained in an on state and the first switching control valve is maintained in an off state before the displacement switching of the compressor, and the first switching control valve is opened after a lapse of a period of time.
5. The air conditioning system of claim 4, wherein the second on-off control valve is closed after the first on-off control valve is opened for a period of time.
6. The air conditioning system of claim 1, wherein the first on-off control valve is closed after the first on-off control valve is opened for a period of time.
7. A control method of an air conditioning system of a variable capacity compressor, comprising:
detecting whether the variable-capacity compressor meets a switching condition for switching from a small-displacement operation mode to a large-displacement operation mode;
when the variable-capacity compressor meets the switching condition, controlling a variable-capacity cavity of the variable-capacity compressor to be communicated with a low-pressure air suction channel and controlling the variable-capacity cavity to be communicated with a high-pressure air discharge channel;
after a switching condition that the variable-displacement compressor is switched from the small-displacement operation mode to the large-displacement operation mode, the method further includes: and after the variable-volume compressor is stopped, controlling the variable-volume cavity to be disconnected with the low-pressure air suction channel, and keeping the variable-volume cavity to be communicated with the high-pressure air discharge channel.
8. The control method of claim 7, wherein controlling the variable volume chamber of the variable volume compressor to communicate with a low pressure suction passage, and controlling the variable volume chamber to communicate with a high pressure discharge passage comprises:
and after the variable-volume cavity of the variable-volume compressor is controlled to be communicated with the low-pressure air suction channel for the first time, the variable-volume cavity is controlled to be communicated with the high-pressure air discharge channel.
9. The control method according to claim 8, characterized in that after controlling the variable volume chamber to communicate with the high-pressure exhaust passage, the control method further comprises:
and after the variable volume cavity is communicated with the high-pressure exhaust channel for a second time, the variable volume cavity is controlled to be disconnected with the low-pressure air suction channel.
10. The control method according to claim 7, characterized in that after maintaining the variable volume chamber in communication with the high-pressure exhaust passage, the control method further comprises:
and after a period of time, controlling the variable volume cavity and the high-pressure exhaust channel to be closed.
11. A storage medium comprising a stored program, wherein the program performs the control method of the air conditioning system of the variable capacity compressor of any one of claims 7 to 10.
12. A processor for running a program, wherein the program runs to execute the control method of the air conditioning system of the variable capacity compressor according to any one of claims 7 to 10.
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| CN108869287B (en) * | 2018-07-10 | 2024-03-29 | 珠海凌达压缩机有限公司 | Variable-volume compression mechanism, compressor and air conditioner |
| CN109059211B (en) * | 2018-07-24 | 2021-05-07 | 苏州艾尔智科变频科技有限公司 | Shutdown control method and controller for variable frequency system with enhanced vapor injection |
| CN111102768B (en) * | 2019-12-26 | 2021-04-16 | 珠海格力电器股份有限公司 | Control method and device of multi-split air conditioning unit and air conditioning equipment |
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