CN114893921B - Magnetic suspension water chilling unit - Google Patents
Magnetic suspension water chilling unit Download PDFInfo
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- CN114893921B CN114893921B CN202210569323.7A CN202210569323A CN114893921B CN 114893921 B CN114893921 B CN 114893921B CN 202210569323 A CN202210569323 A CN 202210569323A CN 114893921 B CN114893921 B CN 114893921B
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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
- 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
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line 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
- 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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- 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 water chilling unit, which comprises a magnetic suspension centrifugal compressor and a control module; the control module comprises a main controller and a power-down timing module; the main controller is respectively connected with the power-down timing module and the magnetic suspension centrifugal compressor; the power-down timing module is used for power-down timing and transmitting the timing time to the main controller when power is on; the main controller is provided with a preset power-off time length, is configured to receive the timing time length when the unit is electrified, compares the timing time length with the preset power-off time length, and controls the unit according to a comparison result; when the main controller judges that the timing time length reaches the preset power-off time length, the unit is controlled to stand by; otherwise, the unit is controlled to enter a quick start control flow after being electrified. The invention enables the machine set to be quickly started to reach the running state before power failure, ensures the running of equipment in the temperature adjusting space or the quality of articles in the temperature adjusting space, and maintains the benefits of customers.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to a magnetic suspension water chilling unit.
Background
The magnetic suspension water chilling unit is characterized in that the compressor of the centrifugal water chilling unit is a magnetic suspension centrifugal compressor, and a magnetic suspension technology is adopted, so that the mechanical loss is reduced, and the refrigerating operation is more efficient and energy-saving.
The magnetic levitation centrifugal compressor includes a magnetic levitation bearing that levitates a rotor using a magnetic field so that mechanical contact is not generated during rotation and mechanical friction is not generated, thereby eliminating the need for mechanical bearings and a lubrication system necessary for the mechanical bearings.
In the magnetic suspension water chilling unit, the compressor adopts the magnetic suspension bearing technology. The magnetic suspension compressor does not need a traditional refrigeration oil lubrication system, so that an oil way and an oil pump are reduced; the refrigerating system has no frozen oil, so that the influence of an oil film on the heat exchange tube is reduced, the heat exchange resistance is reduced, and the heat exchange efficiency is improved. In addition, the magnetic suspension water chilling unit does not need preheating of a conventional chiller, and the quick start of the magnetic suspension water chilling unit can be realized.
The centrifugal chiller is widely applied to civil buildings, industrial environments, process requirements and data centers. In particular, the process requirement and the data center are strict, and if the temperature of the process is greatly fluctuated during cooling, the product is possibly disqualified or even scrapped; the data center generates great heat and needs to be refrigerated all the year round. For example, if a short power outage occurs in a data center, causing a chiller to not start up or to start up slowly, resulting in a rise in data center temperature and even a downtime of the server, a significant economic loss may result.
Because the magnetic suspension water chilling unit does not need to be stopped regularly to change oil like a common centrifuge and does not need to be preheated in advance, the magnetic suspension water chilling unit is gradually used by a process cooling and data center; because the process cooling and data are uninterrupted throughout the year and the temperature requirements are strict, the requirements for restarting the magnetic suspension water chilling unit after power failure are also strict.
The above information disclosed in this background section is only for enhancement of understanding of the background section of the application and therefore it may not form the prior art that is already known to those of ordinary skill in the art.
Disclosure of Invention
Aiming at the problems of uninterrupted refrigeration and strict temperature requirements of a process cooling and data center and the like pointed out in the background art, the starting efficiency and the refrigeration effect are ensured by setting a power-off quick restart flow for the magnetic suspension water chilling unit, so that the economic loss caused by the inadequacy of temperature control is avoided.
In order to achieve the aim of the invention, the invention is realized by adopting the following technical scheme:
in some embodiments of the present application, a magnetic suspension water chilling unit is provided, including a magnetic suspension centrifugal compressor and a control module;
the control module comprises a main controller and a power-down timing module; the main controller is respectively connected with the power-down timing module and the magnetic suspension centrifugal compressor; the power-down timing module is used for power-down timing, and the timing time is transmitted to the main controller when the power-down timing module is powered on;
the main controller is provided with a preset power-off time length and is configured to receive the timing time length when the unit is electrified, compare the timing time length with the preset power-off time length and control the unit according to a comparison result; when the timing duration reaches the preset power-off duration, the main controller controls the unit to be electrified for standby; and when the timing time does not reach the preset power-off time, the main controller controls the unit to enter a quick start control flow after being electrified.
In some embodiments of the present application, the main controller is configured with the fast start control procedure, which includes:
judging the state of the unit before power failure; if the unit is in a starting state before power failure, continuing the quick start control flow; and if the unit is in a standby state before power failure, ending the quick start control flow and controlling the unit to enter the standby state.
In some embodiments of the present application, the fast start control procedure further includes:
when the unit before power failure is judged to be in a starting state, judging whether a fault alarm exists currently or not;
if the fault alarm exists, the main controller controls the main controller to reset and eliminate the fault alarm; if the fault alarm is eliminated, continuing the quick start control flow; if the fault alarm cannot be eliminated, ending the quick start control flow, and controlling the unit to enter a standby state;
and if the fault alarm is not generated, the main controller continues to execute the quick start control flow.
In some embodiments of the present application, the master controller is configured with an autonomous reset function; when the unit has the fault alarm, the main controller controls the unit to perform autonomous reset to eliminate the fault alarm.
In some embodiments of the present application, the control module includes a reset circuit, which is connected to the main controller; when the unit has the fault alarm, the main controller controls the reset circuit to operate so as to reset the unit and eliminate the fault alarm.
In some embodiments of the present application, a water system is further included, which includes a plurality of water flow sensors, a plurality of water pumps; each water flow sensor is connected with the main controller and is used for detecting water flow of the water system, generating a water flow signal and transmitting the water flow signal to the main controller; the water pump is connected with the main controller and controlled by the main controller;
the quick start control flow further comprises:
when the main controller judges that the fault alarm is not generated or the fault alarm is eliminated, judging the water flow signal; if the main controller judges that the water flow signal meets the starting condition, the unit is controlled to start; and if the main controller judges that the water flow signal does not meet the starting condition, continuously receiving and judging the water flow signal after waiting or continuously receiving and judging the water flow signal after controlling the water pump to start and wait.
In some embodiments of the present application, the water system comprises a chilled water system, a cooling water system; the water flow sensors comprise two water flow signals which are respectively arranged in the chilled water system and the cooling water system and are used for detecting the water flow signals of the chilled water system and the cooling water system.
In some embodiments of the present application, the water pump includes two water pumps, which are respectively disposed in the chilled water system and the cooling water system, and are used for starting circulation of the chilled water system and the cooling water system.
In some embodiments of the present application, the main controller is further provided with a waiting duration and a judgment limit number; when the main controller judges that the water flow signal does not meet the starting condition, the main controller continuously receives and judges the water flow signal after waiting for the waiting time period or continuously receives and judges the water flow signal after controlling the water pump to start and wait for the waiting time period;
if the judging times of the water flow signals reach the judging limit times, the starting condition is met, and the main controller controls the unit to start;
and if the judging times of the water flow signals reach the judging limit times and still do not meet the starting conditions, the main controller ends the quick starting control flow and controls the unit to stand by.
In some embodiments of the present application, the system further includes a plurality of execution elements and a memory, which are respectively connected with the main controller; the main controller controls the memory to store the operation parameters of each executive component when power is off; the magnetic suspension centrifugal compressor comprises a magnetic suspension bearing which is connected with the main controller;
the main controller controlling the unit to start comprises:
controlling the magnetic suspension bearing to start;
and controlling each execution element to start according to the operation parameters.
In some embodiments of the present application, the memory is integrally provided with the main controller.
In some embodiments of the present application, the memory is the host controller register or an on-chip memory.
In some embodiments of the present application, the memory is an off-chip memory of the host controller, and is communicatively connected to the host controller.
In some embodiments of the present application, during operation of the unit, the main controller periodically stores the operation parameters in the memory.
In some embodiments of the present application, the system further includes a plurality of sensors, which are disposed in the system of the unit, connected to the main controller, and detect system parameters of the unit, and transmit the system parameters to the main controller; the operation parameters are the predicted change parameters of the execution elements calculated by the main controller according to the system parameters and are stored in the memory.
Compared with the prior art, the invention has the advantages and positive effects that:
the magnetic suspension water chilling unit judges whether the unit is powered off for a short time or a long time by comparing the timing time length when the unit is powered off with the preset power-off time length; and if the machine set is powered off in a short time, executing a quick start control flow, enabling the machine set to be quickly started to reach an operation state before power off, ensuring that the temperature of the temperature space to be regulated does not have larger temperature reduction or temperature rise, ensuring the operation of equipment in the temperature space to be regulated or the quality of articles in the temperature space to be regulated, and maintaining the economic benefits of customers using the magnetic suspension water chilling unit. If the unit is powered off for a long time, the unit is controlled to be powered on for standby, and energy is saved.
Other features and advantages of the present invention will become apparent upon review of the detailed description of the invention in conjunction with the drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of a unit control system and refrigerant system connection according to an embodiment;
FIG. 2 is a schematic diagram of an in-unit sensor connection according to an embodiment;
FIG. 3 is a schematic diagram of a quick start control flow according to an embodiment;
FIG. 4 is a schematic diagram of a unit power-up control flow according to an embodiment;
FIG. 5 is a schematic diagram of a unit start control flow according to an embodiment;
fig. 6 is a schematic diagram of a unit start control flow according to an embodiment.
Reference numerals:
1. a main controller; 2. an evaporator; 3. a condenser; 4. a compressor; 41. an exhaust port; 5. a chilled water system; 51. a first water pump; 6. a cooling water system; 61. a second water pump; 7. a bearing controller; 8. a frequency converter; 9. a throttle device; 10. a bypass valve; 20. a non-return valve; 301. a first temperature sensor; 302. a second temperature sensor; 303. a third temperature sensor; 304. a fourth temperature sensor; 305. a fifth temperature sensor; 306. a sixth temperature sensor; 401. a first pressure sensor; 402. a second pressure sensor; 501. a first flow sensor; 502. a second flow sensor.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.
The magnetic suspension cooling water unit in this application includes evaporimeter 2, condenser 3, magnetic suspension centrifugal compressor 4, water system and throttling arrangement 9, carries out the circulation through water system heat dissipation and for the cooling of water system and then for the environment cooling through using magnetic suspension centrifugal compressor 4, condenser 3, throttling arrangement 9 and evaporimeter 2. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and performs cooling or heating of a space to be temperature-regulated.
Specifically, the low-temperature low-pressure refrigerant enters the compressor 4, and the compressor 4 compresses the refrigerant gas into a high-temperature high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser 3. The condenser 3 radiates heat through the water system, condenses the high-temperature and high-pressure refrigerant gas into a liquid phase, and releases heat to the water system through the condensation process, and radiates heat through the water system.
The throttling device 9 is provided on a line through which the condenser 3 and the evaporator 2 communicate, and expands the high-temperature high-pressure refrigerant liquid-phase refrigerant condensed into a liquid phase by the condenser 3 into a low-pressure liquid-phase refrigerant. The low-pressure liquid-phase refrigerant absorbs heat through the evaporation of the evaporator 2 and exchanges heat with a water system passing through the evaporator 2 so as to carry cold energy to carry out temperature regulation on a space to be regulated; the low-pressure liquid-phase refrigerant evaporates into a refrigerant gas in a low-temperature low-pressure state, and returns to the compressor 4. The evaporator 2 achieves a refrigerating effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. In the whole circulation, the magnetic suspension water chilling unit carries heat or cools through a water system to regulate the temperature of a space to be regulated.
The magnetic suspension water chilling unit is applied to process requirements and data centers, strictly reduces the temperature for the process requirements or the data centers and the like, and ensures the quality of articles in the process centers and the normal operation of equipment in the data centers. The process requirement and the temperature requirement of a data center are strict; if the temperature of the process is greatly fluctuated during cooling, the product is possibly disqualified or even scrapped; the data center generates great heat, and interruption of refrigeration can cause the data exchange speed to be reduced or downtime to cause great economic loss. Therefore, the refrigeration requirement of the magnetic suspension water chilling unit applied to the process requirement and the data center is more strict.
The magnetic suspension water chilling unit also comprises a control module which comprises a main controller 1 and a power-down timing module; the main controller 1 is respectively connected with a power-down timing module and the magnetic suspension centrifugal compressor 4. The power-down timing module is used for transmitting the timing duration to the main controller 1 when the power-down timer is powered on.
The main controller 1 is provided with a preset power-off time length, and is configured to receive the timing time length sent by the power-off timing module when the unit is powered on, compare the timing time length with the preset power-off time length, and control the unit according to the comparison result.
When the main controller 1 compares the timing time length with the preset power-off time length to obtain a result that the timing time length reaches the preset power-off time length, the machine set is considered to be stopped for a long time, and the machine set is started quickly without power-on recovery; the main controller 1 controls the unit to be electrified for standby; when the main controller 1 compares the timing time length with the preset power-off time length to obtain a result that the timing time length does not reach the preset power-off time length, the control unit enters a quick start control flow after power-on, and if the start condition is met, the control unit is quickly started, and the temperature state of the temperature-regulating space before power-off is maintained.
The magnetic suspension water chilling unit judges whether the unit is powered off for a short time or a long time by comparing the timing time length when the unit is powered off with the preset power-off time length; and if the machine set is powered off in a short time, executing a quick start control flow, enabling the machine set to be quickly started to reach an operation state before power off, ensuring that the temperature of the temperature space to be regulated does not have larger temperature reduction or temperature rise, ensuring the operation of equipment in the temperature space to be regulated or the quality of articles in the temperature space to be regulated, and maintaining the economic benefits of customers using the magnetic suspension water chilling unit. If the unit is powered off for a long time, the unit is controlled to be powered on for standby, and energy is saved.
According to some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, 6, a quick start control procedure is configured in the main controller 1, which includes the following steps.
Firstly, judging the state of the unit before power failure. If the state of the unit before power failure is the starting state, continuing to rapidly start the control flow; if the state of the unit before power failure is a standby state, ending the quick start control flow and controlling the unit to enter the standby state.
The magnetic suspension water chilling unit confirms the state before power failure of the unit through judging the state before power failure, and controls the unit according to the confirmation result; when the magnetic suspension water chilling unit is in a standby state before power-off, the unit is in normal control standby, and the temperature adjustment space does not need strict temperature control, so that a quick start control flow does not need to be executed. At this time, the quick start control flow is ended, the control unit is in a standby state after being electrified, and energy sources are saved. And if the unit is in an operating state before power failure, the unit is controlled to continuously execute a quick start control flow when power is recovered, the purpose of quick temperature adjustment when power is supplied is achieved, and the strict requirement of a temperature adjustment space on temperature is met.
According to some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, and 6, the rapid start control flow further includes the following steps.
And when judging that the state of the unit before power failure is the running state, judging whether a fault alarm exists currently. If there is a fault alarm, the main controller 1 controls the main controller to carry out reset fault elimination alarm. Then, whether the fault alarm exists or not is continuously judged, and if the fault alarm is eliminated, namely, no fault alarm exists, the main controller 1 continues to perform the quick start control flow. If the fault alarm can not be eliminated after the reset, the main controller 1 executes the ending quick start control flow, and controls the unit to enter a standby state.
If the judgment of whether the fault alarm exists or not is a fault alarm after the unit state before the power failure is judged to be the running state, the main controller 1 controls to continuously execute the quick start control flow.
The magnetic suspension water chilling unit of the embodiment carries out the reset fault alarm removal process or directly continues to execute the quick start control process according to the judging result of whether fault alarm exists, and after the reset fault alarm removal, continues to judge whether the fault alarm exists for standby or continues to execute the control of the quick start control process, so that the quick start is ensured when the unit does not have fault alarm, namely the quick start is ensured under the normal condition of the unit, and the safety and the reliability of the quick start of the unit are ensured.
According to some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, 6, the troubleshooting of the master controller 1 may be achieved by autonomous reset or by setting a reset circuit controlled by the master controller 1.
That is, when the main controller 1 determines that the unit is in an operation state before power failure and has fault alarm, the main controller controls the reset circuit to perform reset autonomously or to perform reset, so as to achieve the purpose of eliminating false fault alarm or fault alarm capable of recovering automatically.
Autonomous reset of the master controller 1 may be achieved by writing specific instructions to the respective registers.
The reset circuit is arranged in the control module and connected with the reset pin and the control pin of the main controller 1, and the reset circuit is reset by the control of the main controller 1.
According to some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, and 6, a water system included in a magnetic levitation water chilling unit includes a cooling water system 6 and a chilled water system 5; the cooling water system 6 is used for radiating heat for the condenser 3; the chilled water system 5 is used for exchanging heat with the evaporator 2 during evaporation, and carrying cold energy is used for cooling the temperature-adjusting space.
The water system also comprises a plurality of water flow sensors and a plurality of water pumps; each water flow sensor is respectively arranged in the cooling water system 6 and the chilled water system 5, is connected with the main controller 1, and is used for detecting the water flow of the cooling water system 6 and the chilled water system 5, generating water flow signals and transmitting the water flow signals to the main controller 1; each water pump is connected with the main controller 1, and the main controller 1 controls the operation or stops the operation.
And the main controller 1 judges whether the water system meets the starting condition of the unit according to the received water flow signal after judging that the unit has no fault alarm, and controls the unit according to the judging result.
When the main controller 1 judges that the water flow signal meets the unit starting condition, the unit is controlled to start. When the main controller 1 judges that the water flow signal does not meet the starting condition of the unit, the water pump is controlled to start and the water flow signal transmitted by the water flow sensor is continuously received for judgment after waiting, and the unit is controlled to start or the water flow signal transmitted by the water flow sensor is continuously received for judgment according to the judging result.
The water system in the quick start control flow is set to judge and ensure that the water system meets the start condition, so that the water system can normally operate when the machine set is quickly started, and the purpose of quick temperature control when the machine set is quickly started is achieved.
According to some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, 6, the water pump may be controlled by an external controller; when the water pump is controlled by the external controller, if the water flow signal is judged not to meet the starting condition, the water flow signal transmitted by the water flow sensor is continuously received after waiting, and the unit system is controlled to start or the water flow signal transmitted by the water flow sensor is continuously received after waiting according to the judging result to judge.
According to some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, and 6, the main controller 1 is provided with a waiting period, a judgment limit number; when the main controller 1 judges that the water flow signal does not meet the starting condition, the water flow signal is continuously received and judged after the time delay waiting time length, or the water flow signal is continuously received and judged whether the starting condition is met or not after the water pump is controlled to start.
When the number of times of judging the water flow signal reaches the limit number of times, the starting condition is met, and the main controller 1 controls the unit to start. When the number of times of judging the water flow signal reaches the judgment limit number of times and still does not meet the starting condition, the main controller 1 ends the quick starting control flow and controls the unit to stand by.
The magnetic suspension water chilling unit of the embodiment ensures the accuracy and reliability of water flow signal judgment through the judgment of multiple water flow signals, and improves the reliability and safety of quick start of the unit.
According to some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, and 6, the magnetic levitation water chiller further includes a plurality of execution elements and memories, which are respectively connected with the main controller 1.
When the power is off, the main controller 1 controls the memory to store the operation parameters of each executive component; the magnetic suspension centrifugal compressor 4 comprises a magnetic suspension bearing, which is connected with the main controller 1.
The main controller 1 controls the set start-up to include the following.
Controlling the magnetic suspension bearing to start;
and controlling each execution element to start according to the operation parameters stored and read in the memory.
The magnetic suspension water chilling unit of this embodiment starts with the running state before the outage when recovering the power on after the outage when quick start, guarantees that the magnetic suspension water chilling unit reaches the refrigerating capacity before the outage fast when quick start, guarantees the temperature in temperature adjustment space, reaches the purpose of quick start of unit.
According to some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, and 6, the magnetic levitation bearing control device further comprises a bearing controller 7, which is respectively connected with the main controller 1 and the magnetic levitation bearing, and controls the magnetic levitation bearing to start and control the magnetic levitation bearing to operate when receiving an instruction of starting the magnetic levitation bearing from the main controller 1; the actuator comprises a frequency converter 8 and a throttling device 9. The frequency converter 8 is connected with the main controller 1 and the magnetic suspension centrifugal compressor 4. The throttle device 9 is an electronic expansion valve and is connected with the main controller 1.
The main controller 1 controls the frequency converter 8 to start according to the operating frequency stored in the memory, so that the magnetic suspension centrifugal compressor 4 starts according to the frequency; the control throttle 9 is activated in accordance with the opening degree stored in the memory.
According to some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, and 6, the actuator further includes a bypass valve 10 and a check valve 20, which are respectively connected to the main controller 1, and are controlled to open, open or close by the main controller 1, and are respectively disposed on a bypass path where the evaporator 2 is connected to the condenser 3, and a path where the exhaust port 41 of the compressor 4 is communicated with the condenser 3, so as to control a bypass path of the evaporator 2 and the condenser 3 and prevent a refrigerant in the condenser 3 from flowing backward to the compressor 4, thereby ensuring the safety and reliability of the system operation.
According to some embodiments of the present application, the memory is provided integrally with the host controller 1, and may be a register or an on-chip memory of the host controller 1. Has the advantage of high reading and writing speed and effect.
Of course, the memory may also be off-chip memory separate from the host controller 1, which is communicatively coupled to the host controller 1.
According to some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, and 6, during operation of the unit, the main controller 1 periodically stores the operation parameters in the memory.
The embodiment prevents the quick start failure when the outage storage failure does not have the operation parameter storage and influences the temperature control of the temperature adjusting space.
According to some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, and 6, a plurality of sensors are further included, which are disposed in the crew system and connected to the main controller 1, and system parameters of the detection crew are transmitted to the main controller 1; the main controller 1 calculates the changing parameters of each preset executive component according to the existing operation parameters and system parameters, and is used for adjusting the operation parameters of each executive component in the next step; and the set is used as a preset operation parameter to be stored in a memory and used as the operation parameter for starting the unit in the quick start control flow.
The magnetic suspension water chilling unit of the embodiment prejudges and stores the parameters of the next step of each executive component through the system parameters, and prepares for quick starting in advance after power failure again, so that the refrigerating capacity of the unit reaches the expected effect in advance.
Specifically, if the compressor is powered off during the frequency raising process, the refrigeration speed will be reduced if the compressor is started again at the frequency before the power off, resulting in delay of temperature control. According to the pre-judgment, a number value is added to the frequency before power failure as the frequency for restarting the power supply, so that temperature regulation lag is prevented. Accordingly, if the frequency increases, the opening of the corresponding valve (e.g., throttle valve, bypass valve 10, etc.) is also increased by an appropriate opening to prevent low pressure warning; and vice versa. In addition, if the frequency is not changed before the power failure, but the valve opening is in an increasing process, the valve opening is increased by a value compared with the opening before the power failure to achieve the expected effect when the power failure is started again.
According to some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, 6, the sensors include one or more of a first temperature sensor 301, a second temperature sensor 302, a third temperature sensor 303, a fourth temperature sensor 304, a fifth temperature sensor 305, a sixth temperature sensor 306 for detecting a chilled water inlet temperature, a chilled water outlet temperature, an evaporation temperature, a condensation temperature, respectively.
The sensor further comprises a first pressure sensor 401, a second pressure sensor 402 for detecting the evaporating pressure, the condensing pressure, respectively.
The water flow sensor is a flow sensor, and includes a first flow sensor 501 and a second flow sensor 502, which are respectively used for detecting a flow signal of the chilled water system 5 and a flow signal of the cooling water system 6, and are used as water flow signals.
According to some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, and 6, the water pumps include two water pumps, namely, a first water pump 51 and a second water pump 61, which are connected to the main controller 1, controlled by the main controller or an external system controller, and respectively disposed in the chilled water system 5 and the cooling water system 6.
In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (5)
1. The magnetic suspension water chilling unit comprises a magnetic suspension centrifugal compressor and is characterized by also comprising a control module;
the control module comprises a main controller and a power-down timing module; the main controller is respectively connected with the power-down timing module and the magnetic suspension centrifugal compressor; the power-down timing module is used for power-down timing, and the timing time is transmitted to the main controller when the power-down timing module is powered on;
the main controller is provided with a preset power-off time length and is configured to receive the timing time length when the unit is electrified, compare the timing time length with the preset power-off time length and control the unit according to a comparison result; when the timing duration reaches the preset power-off duration, the main controller controls the unit to be electrified for standby; when the timing time does not reach the preset power-off time, the main controller controls the unit to enter a quick start control flow after being electrified;
the main controller is configured with the quick start control flow, which includes:
judging the state of the unit before power failure; if the unit is in a starting state before power failure, continuing the quick start control flow; if the unit is in a standby state before power failure, ending the quick start control flow, and controlling the unit to enter the standby state;
the quick start control flow further comprises:
when the unit before power failure is judged to be in a starting state, judging whether a fault alarm exists currently or not;
if the fault alarm exists, the main controller controls the main controller to reset and eliminate the fault alarm; if the fault alarm is eliminated, continuing the quick start control flow; if the fault alarm cannot be eliminated, ending the quick start control flow, and controlling the unit to enter a standby state;
if the fault alarm is not given, the main controller continues to execute the quick start control flow;
the system also comprises a water system, wherein the water system comprises a plurality of water flow sensors and a plurality of water pumps; each water flow sensor is connected with the main controller and is used for detecting water flow of the water system, generating a water flow signal and transmitting the water flow signal to the main controller; the water pump is connected with the main controller and controlled by the main controller;
the quick start control flow further comprises:
when the main controller judges that the fault alarm is not generated or the fault alarm is eliminated, judging the water flow signal; if the main controller judges that the water flow signal meets the starting condition, the unit is controlled to start; if the main controller judges that the water flow signal does not meet the starting condition, the main controller continuously receives and judges the water flow signal after waiting or continuously receives and judges the water flow signal after controlling the water pump to start and wait;
the main controller is also provided with waiting time and judging limiting times; when the main controller judges that the water flow signal does not meet the starting condition, the main controller continuously receives and judges the water flow signal after waiting for the waiting time period or continuously receives and judges the water flow signal after controlling the water pump to start and wait for the waiting time period;
if the judging times of the water flow signals reach the judging limit times, the starting condition is met, and the main controller controls the unit to start;
if the judging times of the water flow signals reach the judging limit times and still do not meet the starting conditions, the main controller ends the quick starting control flow and controls the unit to stand by;
the system also comprises a plurality of execution elements and a memory, wherein the execution elements and the memory are respectively connected with the main controller; the main controller controls the memory to store the operation parameters of each executive component when power is off; the magnetic suspension centrifugal compressor comprises a magnetic suspension bearing which is connected with the main controller;
the main controller controlling the unit to start comprises:
controlling the magnetic suspension bearing to start;
and controlling each execution element to start according to the operation parameters.
2. The magnetic levitation water chilling unit according to claim 1, wherein the main controller is configured with an autonomous reset function; when the unit has the fault alarm, the main controller controls the unit to perform autonomous reset to eliminate the fault alarm.
3. The magnetic levitation water chilling unit of claim 1, wherein the memory is integrally provided with the main controller.
4. A magnetic levitation water chilling unit according to any of claims 1-3, wherein the main controller periodically stores the operating parameters into the memory during operation of the unit.
5. The magnetic levitation water chilling unit according to claim 4, further comprising a plurality of sensors disposed in a system of the unit, connected with the main controller, detecting a system parameter of the unit and transmitting to the main controller; the operation parameters are the predicted change parameters of the execution elements calculated by the main controller according to the system parameters and are stored in the memory.
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| CN202210569323.7A CN114893921B (en) | 2022-05-24 | 2022-05-24 | Magnetic suspension water chilling unit |
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| CN202210569323.7A CN114893921B (en) | 2022-05-24 | 2022-05-24 | Magnetic suspension water chilling unit |
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