CN111895673A - Magnetic suspension centrifugal unit, starting control method and device thereof, medium and air conditioner - Google Patents

Magnetic suspension centrifugal unit, starting control method and device thereof, medium and air conditioner Download PDF

Info

Publication number
CN111895673A
CN111895673A CN202010589654.8A CN202010589654A CN111895673A CN 111895673 A CN111895673 A CN 111895673A CN 202010589654 A CN202010589654 A CN 202010589654A CN 111895673 A CN111895673 A CN 111895673A
Authority
CN
China
Prior art keywords
magnetic suspension
suspension centrifugal
bypass pipeline
pipeline
centrifugal compressor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010589654.8A
Other languages
Chinese (zh)
Other versions
CN111895673B (en
Inventor
梁相之
何林
黄童毅
罗建飞
李明
刘廷亮
彭金成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
Original Assignee
Gree Electric Appliances Inc of Zhuhai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Publication of CN111895673A publication Critical patent/CN111895673A/en
Application granted granted Critical
Publication of CN111895673B publication Critical patent/CN111895673B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
    • F25B1/053—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of turbine type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/10—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/12—Sound
    • 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

Abstract

The invention discloses a magnetic suspension centrifugal unit and a starting control method and device thereof, a storage medium and an air conditioner, wherein the magnetic suspension centrifugal unit comprises a circulation main pipeline communicated with a magnetic suspension centrifugal compressor, a condenser and an evaporator, an air suction and exhaust bypass pipeline is arranged between an air outlet and an air inlet of the magnetic suspension centrifugal compressor, a hot gas bypass pipeline for shunting high-temperature gas entering the condenser to the evaporator is also arranged between the condenser and the evaporator, and the air suction and exhaust bypass pipeline and/or the hot gas bypass pipeline are/is provided with a noise reduction structure. The noise reduction structure is arranged on the air suction and exhaust bypass pipeline and/or the hot air bypass pipeline, so that the noise of the magnetic suspension centrifugal unit during shutdown and/or startup can be reduced.

Description

Magnetic suspension centrifugal unit, starting control method and device thereof, medium and air conditioner
Technical Field
The invention relates to the technical field of compressors, in particular to a magnetic suspension centrifugal unit, a starting control method and device thereof, a storage medium and an air conditioner.
Background
The magnetic suspension centrifugal compressor eliminates the original oil circuit lubrication system, adopts electromagnetic force to suspend the rotor for friction-free rotation, and reduces energy consumption and noise caused by friction. Since an oil supply system is not required and the cost can be reduced, the magnetic levitation centrifugal compressor is widely used in various places such as an air conditioning system. When the magnetic suspension centrifugal compressor is applied to an air conditioning system, the core technology of the magnetic suspension centrifugal compressor is to control the floating of a rotor and adapt to the reliability of the rotor under various working conditions. In an air conditioning system, in order to ensure that the system always moves under a given return air pressure state, a hot gas bypass pipeline is usually arranged to bypass a high-temperature gaseous refrigerant at a high-pressure end to a low-pressure end of the system, and usually the high-temperature high-pressure gas inlet end of a condenser is bypassed to an inlet of an evaporator; in addition, in order to prevent the magnetic suspension centrifugal compressor from generating exhaust backflow to impact the suspended rotor at the closing moment of the check valve when the exhaust pressure is gradually reduced during shutdown, an exhaust and intake bypass pipeline is additionally arranged on the air suction side and the air exhaust side of the compressor. Both the exhaust and intake bypass line and the hot gas bypass line are prone to produce whistling noise.
Disclosure of Invention
Aiming at the defect that the magnetic suspension centrifugal unit of the existing air conditioning system is easy to generate noise when the air conditioning system is started or shut down, the invention provides the magnetic suspension centrifugal unit which adopts a noise reduction structure and can reduce the generation of noise.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a magnetic suspension centrifugal unit, its includes the circulation main line of intercommunication magnetic suspension centrifugal compressor, condenser, evaporimeter be equipped with between magnetic suspension centrifugal compressor's the gas vent and the air inlet and inhale the exhaust bypass pipeline the condenser with still be equipped with the hot gas bypass pipeline that shunts the high-temperature gas who gets into the condenser to the evaporimeter between the evaporimeter, inhale the exhaust bypass pipeline and/or hot gas bypass pipeline is equipped with the structure of making an uproar of falling.
Through more repeated use, the magnetic suspension centrifugal unit often produces noise when shutting down. The inventor finds that the noise generated during shutdown is caused by the fact that when a magnetic suspension centrifugal unit stops working, the rotating speed of an impeller in the magnetic suspension centrifugal compressor is gradually reduced in the shutdown process of the magnetic suspension centrifugal compressor, at the moment, the exhaust pressure of the magnetic suspension centrifugal compressor is gradually reduced, when the exhaust pressure is reduced to a certain degree, a refrigerant sucked by the magnetic suspension centrifugal compressor is balanced by the suction and exhaust bypass pipe, and the noise is generated at the moment when the refrigerant enters the suction and exhaust bypass pipe from a circulation main pipe of an exhaust port of the magnetic suspension centrifugal compressor, so that the noise can be effectively reduced due to the fact that the noise reduction structure is arranged on the suction and exhaust bypass pipe.
When the magnetic suspension centrifugal compressor is started, the hot gas bypass pipeline which plays a role in anti-surge control can generate noise, so that the noise reduction structure is arranged on the hot gas bypass pipeline, and the noise can be effectively reduced.
Furthermore, the noise reduction structure is arranged at the air inlet of the air suction and exhaust bypass pipeline and/or the air outlet of the air suction and exhaust bypass pipeline.
Furthermore, the air inlet of the hot gas bypass pipeline and/or the air outlet of the hot gas bypass pipeline are/is provided with the noise reduction structure
Furthermore, the noise reduction structure comprises a flow guide pipe, the flow guide pipe is provided with a main pipeline connecting port and a bypass pipeline connecting port, and the pipe diameter of the flow guide pipe is gradually reduced from the main pipeline connecting port to the bypass pipeline connecting port.
Furthermore, the main pipeline connecting port is connected with the circulation main pipeline, and the bypass pipeline connecting port is connected with the exhaust bypass pipeline or the hot gas bypass pipeline.
Furthermore, the suction and exhaust bypass pipeline is provided with a first electromagnetic valve, and the hot gas bypass pipeline is provided with a second electromagnetic valve.
Furthermore, a one-way check valve is arranged on a pipe section of the circulation main pipeline, which is communicated with the exhaust port of the magnetic suspension centrifugal compressor and the air inlet of the condenser, and the air inlet of the air suction and exhaust bypass pipeline is arranged on the pipe section between the exhaust port of the magnetic suspension centrifugal compressor and the one-way check valve.
Further, the diameter of the pipeline of the suction and exhaust bypass pipeline and the diameter of the pipeline of the hot gas bypass pipeline are both smaller than the diameter of the pipeline of the circulation main pipeline.
Another object of the present invention is to provide a power-on control method for the magnetic suspension centrifugal machine set, which includes:
when an instruction for starting the magnetic suspension centrifugal compressor is received, detecting current starting parameters of the magnetic suspension centrifugal unit; the current starting parameters comprise the condensing pressure of the condenser and the evaporating pressure of the evaporator; and calculating the difference value between the condensing pressure and the evaporating pressure, opening the hot gas bypass pipeline when the difference value is larger than a preset starting pressure difference, and then starting the magnetic suspension centrifugal compressor.
Further, the preset starting pressure difference value is set according to the rotor balance pressure value of the magnetic suspension centrifugal compressor.
The invention also provides another starting control method of the magnetic suspension centrifugal unit, which comprises the following steps:
when an instruction for starting the magnetic suspension centrifugal compressor is received, detecting current starting parameters of the magnetic suspension centrifugal unit; the current starting parameters comprise the cooling water temperature of cooling water for exchanging heat with a refrigerant at the condenser and the freezing water temperature of freezing water for exchanging heat with the refrigerant at the evaporator; and calculating the difference value between the cooling water temperature and the freezing water temperature, opening the hot gas bypass pipeline when the difference value is larger than the preset starting temperature difference, and then starting the magnetic suspension centrifugal compressor.
The invention also provides a starting control device of the magnetic suspension centrifugal unit, which comprises:
a detection unit: the magnetic suspension centrifugal compressor is used for detecting the current starting parameters of the magnetic suspension centrifugal unit when receiving an instruction for starting the magnetic suspension centrifugal compressor; the current starting parameters comprise the condensing pressure of the condenser and the evaporating pressure of the evaporator; or the current starting parameters comprise a cooling water temperature of cooling water for exchanging heat with a refrigerant at the condenser and a freezing water temperature of freezing water for exchanging heat with the refrigerant at the evaporator;
a control unit: and the magnetic suspension centrifugal compressor is used for opening the hot gas bypass pipeline and then starting the magnetic suspension centrifugal compressor when the difference value between the condensing pressure and the evaporating pressure is greater than a preset starting-up pressure difference or the difference value between the cooling water temperature and the freezing water temperature is greater than a preset starting-up temperature difference.
The invention also provides a storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of any of the methods described above.
The invention also provides an air conditioner which comprises the magnetic suspension centrifugal unit.
The invention also provides an air conditioner which comprises the starting control device of the magnetic suspension centrifugal unit.
The present invention also provides an air conditioner, comprising:
a processor for executing a plurality of instructions;
a memory to store a plurality of instructions;
the plurality of instructions are stored in the memory, and are loaded by the processor and execute the starting control method.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the noise reduction structure is arranged on the air suction and exhaust bypass pipeline and/or the hot air bypass pipeline, so that the noise of the magnetic suspension centrifugal unit during shutdown and/or startup can be reduced;
2. the starting control method comprises the steps of detecting the current starting parameters of the unit, controlling the magnetic suspension centrifugal compressor to be not required to open the hot gas bypass pipeline before starting according to the starting parameters, and directly avoiding the generation of noise without opening the hot gas bypass pipeline if the current starting parameters can meet the preset starting requirements; if the current starting parameters cannot meet the preset starting requirement, the hot gas bypass pipeline is opened, and the noise can be reduced due to the fact that the hot gas bypass pipeline is provided with the noise reduction structure; therefore, the noise reduction structure and the control method can enable the unit to start in a balanced mode and reduce noise.
Drawings
FIG. 1 is a schematic structural diagram of a magnetic levitation centrifugal unit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a startup control method of a magnetic suspension centrifugal unit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a startup control method of a magnetic suspension centrifugal unit according to another embodiment of the present invention;
fig. 4 is a schematic diagram of a control device of a magnetic suspension centrifugal unit according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of the present invention.
Example 1
Referring to fig. 1, a magnetic suspension centrifugal unit includes a magnetic suspension centrifugal compressor 10, a condenser 20, and an evaporator 30, the magnetic suspension centrifugal compressor 10, the condenser 20, and the evaporator 30 are communicated through a main circulation pipeline 40, and a refrigerant circulates among the centrifugal compressor 10, the condenser 20, and the evaporator 30 through the main circulation pipeline. The main circulation pipeline 40 is provided with a one-way check valve 41 on a pipeline between the exhaust port of the magnetically levitated centrifugal compressor 10 and the intake port of the condenser 20. During shutdown of the magnetic suspension centrifugal compressor 10, the rotation speed of the impeller is reduced, the exhaust pressure is gradually reduced, and when the exhaust pressure is reduced to a certain degree, high-pressure gas in the condenser 20 flows back into the magnetic suspension centrifugal compressor 10 due to pressure difference in the main circulation pipeline 40, and impacts a rotor to cause faults such as shaft collision of the rotor during shutdown. Therefore, a one-way check valve 41 is added to a pipeline section from the exhaust port of the magnetic suspension centrifugal compressor 10 of the circulation main pipeline 40 to the air inlet port of the condenser 20, so as to prevent the backflow impact of the high-pressure gaseous refrigerant in the condenser 20. While the one-way check valve 41 prevents backflow impact, when the discharge pressure is gradually less than the minimum opening pressure, the check valve closes to cause backflow of the discharge gas to impact the suspended rotor. Therefore, a suction and exhaust bypass pipeline 50 is added on the suction side and the exhaust side (the front end of the one-way check valve 41) of the magnetic suspension centrifugal compressor 10 to solve the problem that the exhaust pressure is not enough to support the check valve when the one-way check valve 41 is closed, and the backflow impacts the rotor.
The exhaust and suction bypass pipeline 50 is provided with a first electromagnetic valve 51 for opening the exhaust and suction bypass pipeline 50 when the engine is stopped. However, during use, every time the first electromagnetic valve 51 is opened, a loud noise may occur in the process of the suction/exhaust bypass line 50 balancing the returned exhaust gas pressure. It is found that the noise is generated because the diameter of the main circulation pipeline 40 is large, and the diameter of the bypass suction and exhaust pipeline 50 is small, so that the cross-sectional area of the gas suddenly enters the small pipeline from the large pipeline, the flow velocity is relatively large, and the noise similar to a whistle is generated. Therefore, a noise reduction structure 52 is added to the intake/exhaust bypass line 50. The noise reduction structure 52 includes a flow guide tube having a main pipe connection port 52a and a bypass pipe connection port 52b, and the diameter of the flow guide tube is gradually reduced from the main pipe connection port 52a to the bypass pipe connection port 52 b. In order to further improve the noise reduction effect, the noise reduction structure is arranged at the air inlet of the air intake and exhaust bypass pipeline 50 and the air outlet of the air intake and exhaust bypass pipeline 50.
Further, a hot gas bypass line 60 for bypassing the high-temperature gas entering the condenser 20 to the evaporator 30 is provided between the condenser 20 and the evaporator 30. The hot gas bypass line 60 is provided with a second solenoid valve 61 for opening or closing the hot gas bypass line 60. The hot gas bypass line 60 can play a role in preventing surge of the magnetic levitation centrifugal compressor 10. When a plurality of magnetic suspension centrifugal units are connected in parallel to share a water system, only a small number of units can be used when the user load is relatively low, and the rest units are in a standby state. When the load of a user is increased, the standby unit is started, but the standby unit is started at the water temperature with large temperature difference, namely, the temperature difference between the cooling water temperature of the cooling water exchanging heat with the refrigerant at the condenser and the freezing water temperature of the freezing water exchanging heat with the refrigerant at the evaporator is larger. Therefore, the second electromagnetic valve 61 is opened during starting, so that the phenomenon that the impact on the bearing of the magnetic suspension centrifugal compressor 10 during starting is too large due to too large temperature difference, and the bearing displacement fault is caused is prevented. Similarly, when the diameter of the main circulation line 40 is larger and the diameter of the hot gas bypass line 60 is smaller, the gas suddenly enters the small line from the large line, the cross-sectional area is reduced, the flow rate is relatively increased, and thus, noise like whistle noise occurs. Therefore, a noise reduction structure 62 is added to the hot gas bypass line 60. Specifically, the noise reduction structure 62 includes a flow guide tube having a main pipeline connection port 62a and a bypass pipeline connection port 62b, and the diameter of the flow guide tube is gradually reduced from the main pipeline connection port 62a to the bypass pipeline connection port 62 b. In order to further improve the noise reduction effect, the air inlet of the hot gas bypass pipeline 60 and the air outlet of the hot gas bypass pipeline 60 are provided with the noise reduction structure.
Example 2
Referring to fig. 2, a startup control method of a magnetic suspension centrifugal unit is used for controlling the magnetic suspension centrifugal unit according to the embodiment. The starting-up control method comprises the following steps:
and S10, detecting the current starting parameters of the magnetic suspension centrifugal machine set when receiving the instruction of starting the magnetic suspension centrifugal compressor. The current startup parameters include a condensing pressure of the condenser and an evaporating pressure of the evaporator. And calculating a difference between the condensing pressure and the evaporating pressure.
And S20, when the difference value is larger than the preset starting pressure difference, opening the hot gas bypass pipeline, namely opening the second electromagnetic valve 61, and then starting the magnetic suspension centrifugal compressor. When the difference is smaller than a preset startup pressure difference, the hot gas bypass line, that is, the second solenoid valve 61, is closed. The noise reduction structure is added in the hot gas bypass pipeline 60, and the starting control of large pressure difference is realized, so that the stable starting and the noise reduction can be realized.
Further, the preset starting pressure difference value is set according to the rotor balance pressure value of the magnetic suspension centrifugal compressor 10. When the rotor of the magnetic levitation centrifugal compressor 10 can still maintain balance under high pressure impact, the preset starting pressure difference value can be increased, so that the second electromagnetic valve 61 still does not need to be opened when the difference value between the condensing pressure and the evaporating pressure is large, the hot bypass gas bypass pipeline 60 does not need to be opened, and noise is not generated under the condition that the rotor balance capacity of the magnetic levitation centrifugal compressor 10 is improved.
Example 3
Referring to fig. 3, a startup control method of a magnetic suspension centrifugal unit is used for controlling the magnetic suspension centrifugal unit according to the embodiment. The starting-up control method comprises the following steps:
and S10, detecting the current starting parameters of the magnetic suspension centrifugal machine set when receiving the instruction of starting the magnetic suspension centrifugal compressor. The current start-up parameter includes a cooling water temperature of cooling water for exchanging heat with a refrigerant at the condenser 20, and a freezing water temperature of freezing water for exchanging heat with a refrigerant at the evaporator 30. And calculating a difference between the cooling water temperature and the freezing water temperature.
And S20, when the difference value is larger than the preset starting temperature difference, opening the hot gas bypass pipeline, namely opening the second electromagnetic valve 61, and then starting the magnetic suspension centrifugal compressor. When the difference is smaller than the preset startup temperature difference, the hot gas bypass line, that is, the second electromagnetic valve 61, is closed. The noise reduction structure is added in the hot gas bypass pipeline 60, and the starting control of large temperature difference can not only realize stable starting but also reduce noise.
Example 4
A power-on control device of a magnetic suspension centrifugal machine assembly, which is used for the magnetic suspension centrifugal machine assembly in embodiment 1, and comprises:
the detection unit 70: and the controller is used for detecting the current starting parameters of the magnetic suspension centrifugal unit when receiving an instruction for starting the magnetic suspension centrifugal compressor. In one embodiment, the current start-up parameter includes a condensing pressure of the condenser and an evaporating pressure of the evaporator, and a difference between the condensing pressure and the evaporating pressure is calculated. In another embodiment, the current start-up parameter includes a cooling water temperature of cooling water for exchanging heat with a refrigerant at the condenser and a freezing water temperature of freezing water for exchanging heat with a refrigerant at the evaporator, and the difference between the cooling water temperature and the freezing water temperature is calculated.
The control unit 80: and controlling the opening and closing of the hot gas bypass pipeline according to the difference value and the preset starting-up value. In one embodiment, the hot gas bypass line is opened when the difference between the condensing pressure and the evaporating pressure is greater than a preset starting pressure difference, and then the magnetic suspension centrifugal compressor is started. In another embodiment, when the difference between the cooling water temperature and the freezing water temperature is greater than a preset starting temperature difference, the hot gas bypass pipeline is opened, and then the magnetic suspension centrifugal compressor is started.
Example 5
A storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the method as claimed in embodiment 2 and/or embodiment 3.
Example 6
An air conditioner comprising a magnetically levitated centrifugal machine assembly as described in embodiment 1.
Example 7
An air conditioner, which comprises the starting control device of the magnetic suspension centrifugal unit according to the embodiment 4.
Example 8
An air conditioner, comprising:
a processor for executing a plurality of instructions;
a memory to store a plurality of instructions;
the instructions are stored in the memory, and loaded by the processor and execute the boot control method according to embodiment 2 or embodiment 3.
The above description is only for the preferred embodiment of the present invention, but the present invention should not be limited to the embodiment and the disclosure of the drawings, and therefore, all equivalent or modifications that do not depart from the spirit of the present invention are intended to fall within the scope of the present invention.

Claims (16)

1. A magnetic suspension centrifugal unit is characterized in that: including the circulation main line of intercommunication magnetic suspension centrifugal compressor, condenser, evaporimeter be equipped with between magnetic suspension centrifugal compressor's the gas vent and the air inlet and inhale the exhaust bypass line the condenser with still be equipped with the hot gas bypass line that shunts the high-temperature gas who gets into the condenser to the evaporimeter between the evaporimeter, inhale exhaust bypass line and/or hot gas bypass line is equipped with and falls the structure of making an uproar.
2. The magnetic levitation centrifuge assembly of claim 1, wherein: the noise reduction structure is arranged at the air inlet of the air suction and exhaust bypass pipeline and/or the air outlet of the air suction and exhaust bypass pipeline.
3. The magnetic levitation centrifuge assembly of claim 1, wherein: the air inlet of the hot gas bypass pipeline and/or the air outlet of the hot gas bypass pipeline are/is provided with the noise reduction structure.
4. The magnetic levitation centrifuge assembly of claim 1, wherein: the noise reduction structure comprises a flow guide pipe, the flow guide pipe is provided with a main pipeline connecting port and a bypass pipeline connecting port, and the pipe diameter of the flow guide pipe is gradually reduced from the main pipeline connecting port to the bypass pipeline connecting port.
5. The magnetic levitation centrifuge set of claim 4, wherein: the main pipeline connecting port is connected with the circulating main pipeline, and the bypass pipeline connecting port is connected with the exhaust bypass pipeline or the hot gas bypass pipeline.
6. The magnetic levitation centrifuge assembly of claim 1, wherein: the suction and exhaust bypass pipeline is provided with a first electromagnetic valve, and the hot gas bypass pipeline is provided with a second electromagnetic valve.
7. The magnetic levitation centrifuge assembly of claim 1, wherein: the circulating main pipeline is provided with a one-way check valve in a pipe section which communicates the exhaust port of the magnetic suspension centrifugal compressor with the air inlet of the condenser, and the air inlet of the air suction and exhaust bypass pipeline is provided with a pipe section between the exhaust port of the magnetic suspension centrifugal compressor and the one-way check valve.
8. The magnetic levitation centrifuge assembly of claim 1, wherein: the diameter of the pipeline of the suction and exhaust bypass pipeline and the diameter of the pipeline of the hot gas bypass pipeline are both smaller than the diameter of the pipeline of the circulation main pipeline.
9. A method for controlling the start-up of a magnetic levitation centrifuge set as claimed in claim 1, comprising:
when an instruction for starting the magnetic suspension centrifugal compressor is received, detecting current starting parameters of the magnetic suspension centrifugal unit; the current starting parameters comprise the condensing pressure of the condenser and the evaporating pressure of the evaporator; and calculating the difference value between the condensing pressure and the evaporating pressure, opening the hot gas bypass pipeline when the difference value is larger than a preset starting pressure difference, and then starting the magnetic suspension centrifugal compressor.
10. The startup control method of the magnetic suspension centrifugal unit according to claim 9, characterized in that: and setting the preset starting pressure difference value according to the rotor balance pressure value of the magnetic suspension centrifugal compressor.
11. A method for controlling the start-up of a magnetic levitation centrifuge set as claimed in claim 1, comprising:
when an instruction for starting the magnetic suspension centrifugal compressor is received, detecting current starting parameters of the magnetic suspension centrifugal unit; the current starting parameters comprise the cooling water temperature of cooling water for exchanging heat with a refrigerant at the condenser and the freezing water temperature of freezing water for exchanging heat with the refrigerant at the evaporator; and calculating the difference value between the cooling water temperature and the freezing water temperature, opening the hot gas bypass pipeline when the difference value is larger than the preset starting temperature difference, and then starting the magnetic suspension centrifugal compressor.
12. A power-on control device for a magnetic levitation centrifuge set as recited in claim 1, comprising:
a detection unit: the magnetic suspension centrifugal compressor is used for detecting the current starting parameters of the magnetic suspension centrifugal unit when receiving an instruction for starting the magnetic suspension centrifugal compressor; the current starting parameters comprise the condensing pressure of the condenser and the evaporating pressure of the evaporator; or the current starting parameters comprise a cooling water temperature of cooling water for exchanging heat with a refrigerant at the condenser and a freezing water temperature of freezing water for exchanging heat with the refrigerant at the evaporator;
a control unit: and the magnetic suspension centrifugal compressor is used for opening the hot gas bypass pipeline and then starting the magnetic suspension centrifugal compressor when the difference value between the condensing pressure and the evaporating pressure is greater than a preset starting-up pressure difference or the difference value between the cooling water temperature and the freezing water temperature is greater than a preset starting-up temperature difference.
13. A storage medium, characterized by: stored thereon, a computer program which, when being executed by a processor, carries out the steps of the method of any one of claims 9 to 10.
14. An air conditioner, characterized in that: comprising a magnetic levitation centrifugal machine assembly as claimed in any one of claims 1 to 8.
15. An air conditioner, characterized in that: a power-on control device comprising the magnetic levitation centrifuge set of claim 12.
16. An air conditioner, comprising:
a processor for executing a plurality of instructions;
a memory to store a plurality of instructions;
wherein the instructions are stored in the memory, loaded by the processor and used for executing the power-on control method according to any one of claims 9 to 10.
CN202010589654.8A 2020-05-12 2020-06-24 Magnetic suspension centrifugal unit, start-up control method and device thereof, medium and air conditioner Active CN111895673B (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN2020103964165 2020-05-12
CN202010396416 2020-05-12
CN202020783422 2020-05-12
CN2020207834221 2020-05-12

Publications (2)

Publication Number Publication Date
CN111895673A true CN111895673A (en) 2020-11-06
CN111895673B CN111895673B (en) 2024-01-23

Family

ID=73207024

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010589654.8A Active CN111895673B (en) 2020-05-12 2020-06-24 Magnetic suspension centrifugal unit, start-up control method and device thereof, medium and air conditioner

Country Status (1)

Country Link
CN (1) CN111895673B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112556251A (en) * 2020-12-10 2021-03-26 珠海格力电器股份有限公司 Water chilling unit and control method thereof

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08261572A (en) * 1995-03-20 1996-10-11 Daikin Ind Ltd Freezing device
KR20070034041A (en) * 2007-03-14 2007-03-27 엘지전자 주식회사 Compress/condensor unit for air - conditioner
JP2011220127A (en) * 2010-04-05 2011-11-04 Denso Corp Exhaust gas circulation device
JP2013155889A (en) * 2012-01-27 2013-08-15 Mitsubishi Electric Corp Device, refrigerator
CN205174912U (en) * 2015-10-27 2016-04-20 广东美的暖通设备有限公司 Air -conditioner
CN208968100U (en) * 2018-08-03 2019-06-11 广州恒星制冷设备集团有限公司 A kind of noise reduction device of magnetcisuspension floating centrifugal unit
CN110411045A (en) * 2019-07-31 2019-11-05 珠海格力电器股份有限公司 Centrifugal chiller and air-conditioning system
CN110455002A (en) * 2019-09-09 2019-11-15 合肥天鹅制冷科技有限公司 A kind of magnetic suspension centrifugal refrigerating machines electromotor cooling system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08261572A (en) * 1995-03-20 1996-10-11 Daikin Ind Ltd Freezing device
KR20070034041A (en) * 2007-03-14 2007-03-27 엘지전자 주식회사 Compress/condensor unit for air - conditioner
JP2011220127A (en) * 2010-04-05 2011-11-04 Denso Corp Exhaust gas circulation device
JP2013155889A (en) * 2012-01-27 2013-08-15 Mitsubishi Electric Corp Device, refrigerator
CN205174912U (en) * 2015-10-27 2016-04-20 广东美的暖通设备有限公司 Air -conditioner
CN208968100U (en) * 2018-08-03 2019-06-11 广州恒星制冷设备集团有限公司 A kind of noise reduction device of magnetcisuspension floating centrifugal unit
CN110411045A (en) * 2019-07-31 2019-11-05 珠海格力电器股份有限公司 Centrifugal chiller and air-conditioning system
CN110455002A (en) * 2019-09-09 2019-11-15 合肥天鹅制冷科技有限公司 A kind of magnetic suspension centrifugal refrigerating machines electromotor cooling system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112556251A (en) * 2020-12-10 2021-03-26 珠海格力电器股份有限公司 Water chilling unit and control method thereof
CN112556251B (en) * 2020-12-10 2024-03-15 珠海格力电器股份有限公司 Water chilling unit and control method thereof

Also Published As

Publication number Publication date
CN111895673B (en) 2024-01-23

Similar Documents

Publication Publication Date Title
CN111520925B (en) Compressor air supply system and compressor air supply control method
US9976565B2 (en) Compressor surge detection
CN110425176B (en) Gas bearing supported centrifugal compressor gas supply system
JP6736357B2 (en) Turbo refrigerator and start control method thereof
CN111365909B (en) Refrigerant circulation system, air conditioning equipment and control method of refrigerant circulation system
CN112303745B (en) Air conditioner and anti-surge control method
CN109855338B (en) Air-cooled magnetic suspension centrifugal unit and shutdown control method thereof
WO2022012568A1 (en) Control method for compressor, control device, and heat exchange system
KR20110127176A (en) Sequencing of variable speed compressors in a chilled liquid cooling system for improved energy efficiency
CN107062550A (en) A kind of water chilling unit control method
CN111895673B (en) Magnetic suspension centrifugal unit, start-up control method and device thereof, medium and air conditioner
CN213066611U (en) Magnetic suspension centrifugal unit and air conditioner
CN218376997U (en) Series centrifugal compressor unit and air conditioning equipment
CN112460859A (en) Water chilling unit and control method thereof
CN216814659U (en) Refrigeration system
CN115492787A (en) Anti-surge control method of series centrifugal compressor unit and air conditioning equipment
CN112628895B (en) Direct expansion type air conditioning unit and control method thereof
CN113137710A (en) Control method of evaporative condenser unit
CN210951938U (en) Water chilling unit
CN112413860A (en) Control method and system for air conditioning system of machine room
CN113864974A (en) Air conditioning unit, control method and device thereof, storage medium and processor
CN112728794A (en) Centrifugal compressor and refrigerating system of refrigerant liquid lubrication bearing
TWI307398B (en) Flooded chiller and control method thereof
CN117638322A (en) Control method of energy storage thermal management system of centrifugal compressor
CN218936697U (en) Water chilling unit and central air conditioner

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant