CN113945021B - Method and device for controlling start and stop of water chilling unit and water chilling unit - Google Patents

Method and device for controlling start and stop of water chilling unit and water chilling unit Download PDF

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Publication number
CN113945021B
CN113945021B CN202111271372.4A CN202111271372A CN113945021B CN 113945021 B CN113945021 B CN 113945021B CN 202111271372 A CN202111271372 A CN 202111271372A CN 113945021 B CN113945021 B CN 113945021B
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China
Prior art keywords
air supply
controlling
water
chilling unit
water chilling
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CN202111271372.4A
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CN113945021A (en
Inventor
陈远
张捷
杨明威
王铁伟
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Priority to CN202111271372.4A priority Critical patent/CN113945021B/en
Publication of CN113945021A publication Critical patent/CN113945021A/en
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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
    • 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
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The application relates to the technical field of refrigeration and discloses a method for controlling start and stop of a water chilling unit, which comprises the following steps: acquiring air supply parameters and operation parameters of a water chilling unit; and controlling the start or stop of the water chilling unit according to the acquired air supply parameters and the operation parameters. And controlling the start or stop of the water chilling unit by acquiring the air supply parameter and the operation parameter of the water chilling unit. Therefore, according to the operation parameters of the water chilling unit and by combining the air supply characteristic of the water chilling unit with the air suspension compressor, the start-stop of the water chilling unit is controlled, so that the start-stop protection control process of the water chilling unit can be perfected, the control precision is improved, the frequent start-stop of the water chilling unit can be avoided, and the service life of the water chilling unit is prolonged. The application also discloses a device for controlling the start and stop of the water chilling unit and the water chilling unit.

Description

Method and device for controlling start and stop of water chilling unit and water chilling unit
Technical Field
The application relates to the technical field of refrigeration, for example, to a method and a device for controlling start and stop of a water chilling unit and the water chilling unit.
Background
At present, a gas suspension water chilling unit belongs to a class of centrifugal water chilling units, and the name is obtained because a compressor adopts a gas suspension compressor. Compared with the conventional unit, the air suspension water chilling unit has the advantages of oil-free design, small cold output, high energy efficiency and the like, which are not possessed by the conventional centrifugal unit.
The existing control method for controlling the start and stop of the water chilling unit system comprises the following steps: step 1, judging whether the temperature difference value of the real-time water temperature and the preset water temperature falls into a preset increasing temperature difference value section or a preset decreasing temperature difference value section, and if so, entering a step 2; step 2, judging whether the increasing interval time or the decreasing interval time between the compressors reaches the preset interval time, if so, entering step 3; step 3, judging whether an increasing-starting condition or a decreasing-stopping condition is met, if yes, increasing the compressor or decreasing the compressor; if not, entering a step 4; step 4, judging whether additional conditions of starting up the compressor or stopping the compressor are met, if yes, starting up the compressor or stopping the compressor; if not, returning to the step 1, wherein the additional conditions of starting the compressor or stopping the compressor comprise judging whether the temperature change rate of the water temperature reaches a preset value.
It can be seen that the existing method for controlling the start and stop of the water chiller is generally applicable to the conventional centrifugal water chiller. However, for the air suspension water chiller, because of the air supply characteristic, the air supply is also a factor to be considered in the process of controlling the start and stop of the air suspension water chiller. If the start-stop method suitable for the conventional centrifugal chiller is still used when the start-stop of the air suspension chiller is controlled, the air supply characteristic is not considered, and the control accuracy is affected.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.
The embodiment of the disclosure provides a method and a device for controlling start and stop of a water chilling unit and the water chilling unit, so as to improve the control accuracy of the start and stop of the water chilling unit.
In some embodiments, the method comprises: acquiring air supply parameters and operation parameters of a water chilling unit; and controlling the start or stop of the water chilling unit according to the acquired air supply parameters and the operation parameters.
In some embodiments, the apparatus comprises: the system comprises a processor and a memory storing program instructions, wherein the processor is configured to execute the method for controlling the start and stop of the water chiller when the program instructions are executed.
In some embodiments, the water chiller includes: a refrigerant circulation circuit comprising: a gas suspension compressor, a condenser and an evaporator; a gas supply line comprising: the inlet of the condensation air supply pipeline is communicated with the condenser; the inlet of the evaporation air supply pipeline is communicated with the evaporator; the inlet of the main pipeline is communicated with the outlet of the condensation air supply pipeline and the outlet of the evaporation air supply pipeline through a three-way valve, and the outlet of the main pipeline is communicated with the air supply port of the air suspension compressor; the air supply tank is arranged on the main pipeline; the driving pump is arranged on the main pipeline; the heating device is arranged in the air supply tank; the chilled water pump is communicated with the evaporator; and the device for controlling the start and stop of the water chilling unit.
The method and the device for controlling the start and stop of the water chilling unit and the water chilling unit provided by the embodiment of the disclosure can realize the following technical effects:
and controlling the start or stop of the water chilling unit by acquiring the air supply parameter and the operation parameter of the water chilling unit. Thus, according to the operation parameters of the water chilling unit and by combining the air supply characteristic of the water chilling unit with the air suspension compressor, the start and stop of the water chilling unit are controlled. The start-stop protection control process of the unit can be perfected, and the control precision is improved. And the frequent start and stop of the unit can be avoided, and the service life of the unit is prolonged.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:
FIG. 1 is a schematic diagram of a chiller provided by an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a method for controlling start-stop of a chiller according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a method for controlling start-up and stop of a chiller according to acquired air supply parameters and operation parameters according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a method for controlling a water chiller to start and stop according to an operation parameter in a method for controlling a water chiller according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a method for controlling a chiller to stop according to acquired air supply parameters and operation parameters in a method for controlling a chiller to stop according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a method for controlling a water chiller to stop according to an air supply parameter in a method for controlling a water chiller to stop according to an embodiment of the present disclosure;
FIG. 7 is a schematic illustration of an application of an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of an apparatus for controlling start and stop of a chiller according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram of another device for controlling start-stop of a water chiller provided by an embodiment of the present disclosure.
Reference numerals:
10. a gas suspension compressor; 20. a condenser; 30. an evaporator; 40. an air supply line; 41. a condensing air supply pipeline; 42. an evaporation air supply pipeline; 43. a main pipeline; 44. a three-way valve; 45. a regulating valve; 46. driving a pump; 47. a gas supply tank; 48. a one-way valve; 50. load balancing pipelines; 51. a load balancing valve; 60. a heating device.
Detailed Description
So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.
The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described 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 in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The term "plurality" means two or more, unless otherwise indicated.
In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.
The term "corresponding" may refer to an association or binding relationship, and the correspondence between a and B refers to an association or binding relationship between a and B.
Referring to fig. 1, an embodiment of the present disclosure provides a water chiller, including: a refrigerant circulation circuit and a gas supply line 40. Wherein, refrigerant circulation circuit includes: a gas suspension compressor 10, a condenser 20 and an evaporator 30. The gas suspension compressor 10 has a gas supply port. The air inlet and the air outlet of the air suspension compressor 10 are provided with pressure sensors, which are capable of detecting the pressure P of the air inlet and the pressure P of the air outlet. Compression ratio P ratio=p row/P in of the gas suspension compressor 10. A load balancing line 50 is in communication between the condenser 20 and the evaporator 30. The load balancing line 50 is provided with a load balancing valve 51. Flow detection devices are arranged at the water inlet and outlet of the condenser 20 and the water inlet and outlet of the evaporator 30 to detect the cooling water flow rate at the water inlet and outlet of the condenser 20 and the cooling water flow rate at the water inlet and outlet of the evaporator 30.
The air supply line 40 includes: a condensing air supply line 41, an evaporating air supply line 42 and a main line 43. The inlet of the condensing air supply line 41 communicates with the condenser 20. The inlet of the evaporation air supply line 42 communicates with the evaporator 30. The outlet of the condensing air supply line 41 and the outlet of the evaporating air supply line 42 are connected to the inlet of the main line 43 through a three-way valve 44. The outlet of the main line 43 communicates with the air supply port of the air suspension compressor 10. The condensation air supply line 41 and the evaporation air supply line 42 supply air to the bearings of the air suspension compressor 10 through the main line 43. The condensing air supply line 41 is provided with a check valve 48. The check valve 48 defines the flow direction of the refrigerant in the condensation gas supply line 41 from the condenser 20 to the main line 43. The evaporation air supply line 42 is provided with a regulating valve 45. The opening degree of the regulating valve 45 can be changed to change the flow rate of the refrigerant in the evaporation gas supply line 42. Alternatively, the regulator valve 45 is a solenoid valve. The main pipe 43 is provided with a drive pump 46 and an air supply tank 47. The driving pump 46 and the gas supply tank 47 are disposed in this order along the flow direction of the refrigerant in the main pipe 43. A heating device 60 is provided in the air supply tank 47 for heating the refrigerant in the air supply tank 47 so that the temperature and pressure of the refrigerant meet the requirements of the air suspension compressor 10. The chilled water pipe communicates with the evaporator 30 to exchange heat between chilled water and refrigerant in the evaporator 30. The chilled water pipe is provided with a chilled water pump. The outlet of the chilled water pipe is provided with a temperature sensor for detecting the outlet water temperature of chilled water. The cooling water pipe communicates with the condenser 20 so that the cooling water exchanges heat with the refrigerant in the condenser 20. The cooling water pipe is provided with a cooling water pump. Alternatively, the drive pump 46 is a gear pump.
Referring to fig. 2, an embodiment of the present disclosure provides a method for controlling start-stop of a water chiller, including:
s201, the water chilling unit acquires the air supply parameters and the operation parameters.
S202, controlling the water chilling unit to start or stop according to the acquired air supply parameters and the operation parameters.
For an air-suspension chiller, it is necessary to supply air to the bearings during operation. The air supply parameters of the water chiller may include: the liquid level of the air supply tank, the liquid level of the condenser and other parameters. The liquid level of the air supply tank can be obtained through a liquid level meter arranged in the air supply tank. The condenser liquid level can be obtained by a liquid level meter arranged in the condenser. The operating parameters of the chiller may include: the outlet water temperature of the chilled water, the operation parameters of the air suspension compressor and the like. The outlet water temperature of the chilled water is obtained by a temperature sensor arranged at the chilled water outlet. The operating parameters of the gas suspension compressor may include: the number of faults, the shutdown time interval, the compression ratio and other parameters of the air suspension compressor. And controlling the start or stop of the water chilling unit according to the proper air supply parameters and the proper operation parameters.
In the embodiment of the disclosure, the start or stop of the water chilling unit is controlled by acquiring the air supply parameter and the operation parameter of the water chilling unit. Thus, according to the operation parameters of the water chilling unit and by combining the air supply characteristic of the water chilling unit with the air suspension compressor, the start and stop of the water chilling unit are controlled. The control method not only can perfect the start-stop protection control process of the unit and improve the control precision, but also can avoid frequent start-stop of the unit, thereby prolonging the service life of the unit.
Optionally, referring to fig. 3, the water chiller controls the start of the water chiller according to the acquired air supply parameter and the operation parameter, including:
s301, controlling the pre-start of the water chilling unit according to the air supply parameters.
S302, after the pre-starting of the water chilling unit is completed, the water chilling unit is controlled to be started formally according to the operation parameters.
In the starting process of the water chilling unit, the pre-starting is firstly carried out. And after the pre-starting is finished, controlling the water chilling unit to be formally started. In the pre-start-up process, the bearing is mainly pre-supplied with air. Therefore, at this time, the pre-starting of the water chiller is controlled according to the air supply parameters. When the water chiller is started formally, the air suspension compressor, the chilled water pump and the like are started. Therefore, at this time, the water chiller is controlled to be started formally according to the operation parameters. Thus, the starting process of the water chilling unit is divided into a pre-starting stage and a formal starting stage. The control is performed according to the air supply parameters aiming at the pre-starting stage, so that the air supply parameters can be ensured to meet the requirement of bearing suspension, and the water chilling unit can smoothly enter the formal starting stage. Aiming at the formal starting stage, the control is carried out according to the operation parameters, so that the operation parameters of the water chilling unit can be ensured to meet the requirement of formal starting, and frequent starting is avoided.
Optionally, the water chiller controls the pre-start according to the air supply parameter, including:
and under the condition that the liquid level of the air supply tank is greater than a first liquid level threshold value and the liquid level of the condenser is greater than a second liquid level threshold value, the water chilling unit controls the heating device to be started.
And under the condition that the liquid level of the air supply tank is larger than a first liquid level threshold value and the liquid level of the condenser is smaller than or equal to a second liquid level threshold value, the water chilling unit is controlled to be started after the regulating valve is opened.
The liquid level H of the air supply tank is obtained through a liquid level meter arranged in the air supply tank and a liquid level meter arranged in the condenser Tank And condenser level X Cold water Percent of the total weight of the composition. Setting a first liquid level threshold H of the liquid level of the gas supply tank 1 ，H 1 To ensure a minimum level value for stable air supply. The refrigerant in the gas supply tank comes from the condenser. Setting a second liquid level threshold value X% of the liquid level of the condenser, wherein X% is the lowest liquid level value of the condenser capable of ensuring sufficient refrigerant in the air supply tank. If H Tank ＞H 1 And X is Cold water The concentration of the refrigerant in the air supply tank is higher than X%, so that the condenser can ensure sufficient refrigerant in the air supply tank, and meanwhile, the refrigerant quantity in the air supply tank can ensure continuous and stable air supply. In this case, the chiller is controlled to enter a pre-start. After the air supply tank is started in advance, the heating device is controlled to be started, so that the heating device heats the refrigerant in the air supply tank. Because the pressure values of the evaporator and the condenser are relatively close at the moment, the heating device can rapidly raise the temperature and the pressure of the refrigerant to the state required by the gas suspension compressor. At this time, the air supply tank performs preliminary air supply to the bearing. Duration of pre-air supply T 1 And then controlling the water chilling unit to enter a starting stage. Alternatively T 1 30 s-180 s. If H Tank ＞H 1 And X is Cold water The percentage is less than or equal to X percent, which indicates that the air supply tank has sufficient refrigerant, but the refrigerant quantity in the condenser can not ensure the sufficient refrigerant in the air supply tank in the air supply process. In this case, the regulating valve is opened, and the heating device is controlled to be turned on. If H Tank ≤H 1 And X is Cold water The content of the refrigerant in the condenser is more than X%, so that the refrigerant in the air supply tank can be ensured to be sufficient in the air supply process, but the refrigerant in the air supply tank is insufficient at the moment, and continuous and stable air supply cannot be ensured. In this case, the condensation air supply pipeline is controlled to be communicated with the main pipeline and the flow rate of the refrigerant in the pipeline is increased, so that the condenser supplements the refrigerant in the air supply tank. Up to H Tank ＞H 1 And then controlling the heating device to be started. If H Tank ≤H 1 And X is Cold water The concentration of the refrigerant in the air supply tank and the condenser is not more than X percent. In this case, the control valve is opened, and the condenser and the evaporator are controlled to simultaneously supply refrigerant to the supply tank. Up to H Tank ＞H 1 And then controlling the heating device to be started.
Specifically, as can be seen from the above, the pre-start of the water chiller needs to satisfy the following two conditions, wherein the condition (2) is a judgment supplementary condition of the condition (1):
①H tank ＞H 1 ；
②X Cold water ％＞X％。
Thus, at H Tank ＞H 1 And X is Cold water When the percentage is more than X%, the heating device is controlled to be started, so that the bearing of the air suspension compressor is pre-supplied with air. The air supply device has the advantages that not only can enough refrigerants be ensured to be supplied in the air storage tank, but also the sufficient refrigerants in the condenser can be ensured to supplement the air supply tank under the condition that the refrigerants in the air supply tank are insufficient, so that the continuous and stable air supply can be ensured.
Referring to fig. 4, the water chiller is controlled to be started formally according to operation parameters, including:
s401, controlling the chilled water pump to start by the water chilling unit.
S401, controlling the water chiller to formally start under the condition that the outlet water temperature of chilled water is greater than a first temperature threshold value and lasts for a first preset time period and the operation parameters of the air suspension compressor meet the starting conditions.
After the water chilling unit is started in advance, the water chilling unit enters a formal starting stage. In the formal starting process of the water chiller, the starting signal is controlled to be closed through an HMI (Human-Computer Interaction or Human-Machine Interaction) device of the chiller. First, the chilled water pump is controlled to start. After the chilled water pump is started, chilled water circulates, so that effective heat absorption and heat extraction of the water chilling unit are guaranteed, and the fault that the suction pressure of the water chilling unit is too low is avoided. After the chilled water pump is started, the outlet water temperature of chilled water is obtained through a temperature sensor arranged at the outlet of the chilled water, and meanwhile, the operation parameters of the air suspension compressor are obtained. If the following condition is satisfied: outlet temperature T of chilled water Out of Is greater than a first temperature threshold for a first preset period of time T 2 And if the operation parameters of the air suspension compressor meet the starting conditions, controlling the water chilling unit to be formally started, namely controlling the air suspension compressor to be electrified and started. Otherwise, only controlling the chilled water pump to run until the conditions are met, and then controlling the water chiller to be started formally. Optionally, a first preset time period T 2 30 s-180 s. The first temperature threshold is set target temperature T Is provided with With a start-up temperature difference T r A kind of electronic device. The chiller may have multiple heads. After the conditions are met, the multi-head water chiller is judged sequentially according to the sequence of whether the water chiller is powered on, whether the water chiller is in emergency stop reset, whether the power on and the flow rate are lower than the flow rate threshold value or not through a PLC (Programmable Logic Controller, a programmable logic controller). If the water chilling unit is not electrified, controlling the water chilling unit to be electrified, and enabling the air suspension compressor to be in a standby state. And then under the condition that the water chilling unit does not suddenly stop and reset, controlling the water chilling unit to suddenly stop and reset. And then controlling the PLC to be powered on under the condition that the PLC is not powered on. And then judging whether the cooling water flow rate at the water inlet and outlet of the condenser and the chilled water flow rate at the water inlet and outlet of the evaporator are smaller than the corresponding flow thresholds. If the flow rate is smaller than the flow rate, the flow rates of the chilled water and the cooling water are respectively larger than or equal to the corresponding flow ratesAn amount threshold. After the judgment is carried out according to the sequence, and each judgment condition is met, the water chilling unit is controlled to be started formally. Therefore, only when the outlet temperature of the chilled water and the operation parameters of the air suspension compressor meet the conditions, the water chilling unit is controlled to be started formally, so that the damage of the unit caused by misoperation of the operation parameters is avoided, and the service life of the unit is prolonged.
Optionally, for the multi-head water chiller, after the water chiller is powered on, the first air suspension compressor which is started preferentially is not timed at intervals. When the PLC is powered on, the control program automatically detects the power supply time of the last PLC. If the PLC power failure time exceeds a preset value, for example, 2880 hours, the unit needs a certain time to preheat. After the unit is preheated, the starting-up is started. When the number of the air suspension compressors of the water chilling unit is greater than 1, the control program takes the average accumulated time of all the air suspension compressors as a judgment basis, and the air suspension compressors are started preferentially with short average running time. When the operation is stopped (non-fault stopping, non-manual stopping), the priority stopping with long average operation time is performed.
Optionally, the parameters of the gas suspension compressor meet the start-up conditions, including: the failure number of the air suspension compressors is smaller than the preset number; and the shutdown time interval of the air suspension compressor is larger than the preset time interval.
When the water chiller starts, factors to be considered include the failure number and the shutdown time interval of the air suspension compressor. For a single head chiller, there is only 1 air suspension compressor. Therefore, when the number of faults of the air suspension compressor is smaller than 1 and the shutdown time interval is larger than the preset time interval, the air suspension compressor meets the starting condition. For a multi-head chiller, there are multiple air suspension compressors. Therefore, when the number of faults of the air suspension compressors is smaller than the preset number and the shutdown time interval is larger than the preset time interval, the air suspension compressors meet the starting conditions. At this time, the preset number may be determined according to the actual requirement, and the minimum is 1. The preset time interval may also be determined according to the time requirement.
Specifically, as can be seen from the above, the following three conditions are satisfied at the same time when the water chiller is started formally:
(3) the failure number of the gas suspension compressor is less than 1;
④T out of ＞T Is provided with +T r And duration T 2 ；
(5) The shutdown time interval of the non-operating gas suspension compressor is greater than the preset time interval.
In this way, in the case where there is a gas suspension compressor that has not failed and the downtime interval is greater than the preset interval, it is determined that the operation parameter of the gas suspension compressor satisfies the start-up condition. The air suspension compressor is guaranteed to be started, and the air suspension compressor is guaranteed to be fully at rest, so that the air suspension compressor can normally run after being started.
Optionally, referring to fig. 5, the water chiller controls the water chiller to stop according to the acquired air supply parameter and the operation parameter, including:
s501, controlling the water chilling unit to stop according to the operation parameters.
S502, under the condition that the water chilling unit is stopped, the water chilling unit controls the stop protection of the water chilling unit according to the air supply parameters.
In the process of stopping the water chilling unit, stopping is firstly carried out, and then stopping protection is carried out. It should be noted that, the shutdown protection phase is: and sending a shutdown command to the stage that the rotor of the compressor completely falls onto the aerosuspension hydrostatic bearing. The control of the shutdown of the water chiller is caused by the fact that the running states of the air suspension compressor, the chilled water pump and the like do not meet the condition that the water chiller continues to run. Therefore, the shutdown of the water chiller is controlled according to the operation parameters of the water chiller. The shutdown protection of the water chilling unit mainly refers to the protection of the bearing of the air suspension compressor. The protection of the bearing is related to the air supply parameter, so the shutdown protection of the water chilling unit is controlled according to the air supply parameter. Thus, the shutdown process of the water chilling unit is divided into a shutdown dynamic stage and a shutdown protection stage. Aiming at the shutdown stage, the control is carried out according to the operation parameters, so that the operation parameters of the water chilling unit can be ensured to meet the shutdown requirement, and frequent shutdown is avoided. And the bearing can be protected according to the air supply parameters in the shutdown protection stage, so that the service life of the air suspension compressor is prolonged.
Optionally, the water chiller is controlled to stop according to the operation parameters, including:
the water chilling unit is controlled to stop under the condition that the compression ratio of the air suspension compressor is larger than or equal to a compression ratio threshold value and lasts for a second preset time period and the outlet water temperature of chilled water is smaller than a second temperature threshold value and lasts for a third preset time period; or, under the condition that the failure number of the air suspension compressors is the total number of the compressors of the water chilling unit, the water chilling unit is controlled to stop; or the water chilling unit controls the shutdown of the air suspension compressor under the condition that the compression ratio of the air suspension compressor is smaller than the shutdown compression ratio threshold value.
Setting a compression ratio threshold value P m . Compression ratio P of gas suspension compressor Ratio of Greater than or equal to compression ratio threshold P m And last for a second preset period of time T 3 And when the water chilling unit meets the shutdown condition or meets the head reduction condition. The now running gas suspension compressor enters a minimum capacity retention state. For a second preset time period T 3 After that, all the gas suspension compressors are shut down. A second temperature threshold is set. Outlet temperature T of chilled water Out of Is less than the second temperature threshold value and lasts for a third preset period of time T 4 And when the water chilling unit is stopped due to unloading. At this time, the chilled water pump is kept on, and the cooling water pump is turned off in a delayed manner. Optionally, the second temperature threshold is a set target temperature T Is provided with Temperature difference T from shutdown s Is a difference between (a) and (b). T (T) 3 And T 4 All 30 s-180 s.
If the failure number of the air suspension compressors is equal to the total number of the compressors of the water chilling unit, the air suspension compressors which can normally start to operate are not provided. Under the condition, the water chilling unit cannot continue to normally run, so that the water chilling unit is controlled to stop and the auxiliary equipment is sequentially closed. If a load balance pipeline exists in the water chilling unit, namely a hot gas bypass pipeline exists, synchronously opening a load balance valve on the load balance pipeline when the water chilling unit is controlled to stop. At least a fourth preset time period T when the load balance valve is opened 5 Then, the gas suspension compressor is controlled to stop and simultaneouslyThe load balancing valve is closed. Alternatively T 5 60s.
Setting a shutdown compression ratio threshold P Stop and stop Which is the minimum compression ratio for normal operation of the chiller. If the water chilling unit is to normally operate, the compression ratio P of the air suspension compressor Ratio of Must be greater than or equal to the shutdown compressor ratio threshold P Stop and stop . If the compression ratio P of all the gas suspension compressors Ratio of Are all smaller than the shutdown compression ratio threshold P Stop and stop And the water chilling unit can not continue to normally run. In this case, the corresponding gas suspension compressor is controlled to stop.
Specifically, as can be seen from the above, the water chiller may be stopped under at least one of the following three conditions:
⑥P ratio of ≥P m And duration T 3 The method comprises the steps of carrying out a first treatment on the surface of the And T is Out of ＜T Is provided with -T s And duration T 4 ；
(7) The number of gas suspension compressor faults = the total number of gas suspension compressors of the chiller;
(8) all air-suspension compressors P Ratio of ＜P Stop and stop 。
Thus, the shutdown conditions of the water chilling units are set according to the operation parameters of the water chilling units, and the water chilling units can be controlled to be shutdown as long as any one condition is met. So that the condition for controlling the shutdown of the water chilling unit is finer and more accurate, and the shutdown of the water chilling unit is controlled more accurately.
Optionally, as shown in fig. 6, the water chiller controls shutdown protection according to the air supply parameters, including:
s601, the water chilling unit controls the condensation air supply pipeline to be disconnected.
S602, controlling the evaporation air supply pipeline to be communicated by the water chilling unit under the condition that the air supply tank liquid level value is larger than the third liquid level threshold value and smaller than the fourth liquid level threshold value.
The structure of the water chilling unit is known to be provided with a condensation air supply pipeline and a steam air supply pipeline. Third liquid level threshold H for setting liquid level value of gas supply tank 2 And a fourth liquid level threshold H 3 . H is the same as 2 ＝H 1 。H 2 Representing the minimum level value of the gas supply tank. H 3 Indicating the maximum level value of the gas supply tank. After the water chilling unit is stopped, the check valve on the condensation air supply pipeline is controlled to be closed, so that the condensation air supply pipeline is controlled to be disconnected. At this time, if the liquid level value of the gas supply tank is H 3 ＜H Tank ＜H 4 And controlling the opening of the regulating valve on the evaporation gas supply pipeline so as to make the evaporator supplement the refrigerant to the gas supply tank. The evaporator supplements the refrigerant to the air supply tank and controls the air supply tank to supply air to the bearing of the air suspension compressor. As the liquid level value of the air supply tank is gradually increased, when H Tank ＝H 4 When the refrigerant in the gas supply tank is sufficient. At this time, the refrigerant does not need to be supplemented to the air supply tank, so that the opening degree of the regulating valve on the evaporator pipeline is gradually reduced by controlling, and the flow of the evaporator pipeline is reduced. The opening degree of the regulating valve on the evaporator pipeline is reduced for a period of time T 6 . At a time length T 6 And the opening of the regulating valve is reduced to zero. The heating device and the drive pump are then controlled to stop operating. Alternatively T 6 30 s-180 s.
Specifically, as can be seen from the above description, the shutdown protection of the water chiller can meet the following conditions:
⑨H 3 ＜H tank ＜H 4 。
Therefore, the air supply tank can be ensured to have sufficient refrigerant when the water chilling unit is started next time. When the water chiller is started next time, the time for supplementing the refrigerant to the air supply tank can be saved, so that the air supply water chiller can be started faster.
In practical application, as shown in fig. 7:
s701, acquiring the liquid level H of the gas supply tank Tank And condenser level X Cold water ％；
S702, judging whether conditions (1) and (2) are satisfied; if yes, then S704 is performed; if not, then S703 is performed;
s703, supplementing refrigerant to the air supply tank; then, S702 is performed again;
s704, controlling the heating device to be started; then S705 is performed;
s705, judging whether the conditions (3), (4) and (5) are satisfied; if yes, then execution S707; if not, then S706 is performed;
s706, only controlling the operation of the chilled water pump; then S705 is performed again;
s707, controlling the start of the water chilling unit; then S708 is performed;
s708, judging whether at least one of the conditions (6), (7) and (8) is satisfied; if yes, then execution S709; if not, then S708 is performed again;
s709, controlling the water chilling unit to stop; then S710 is performed;
s710, controlling the disconnection of a condensation air supply pipeline; then S711 is performed;
s711, judging whether the condition (9) is satisfied; if yes, then S712 is performed; if not, S713 is performed;
s712, controlling the communication of an evaporation gas supply pipeline; then S711 is performed again;
s713, controlling the disconnection of the evaporation air supply pipeline; then S714 is performed;
and S714, controlling the heating device and the driving pump to stop running.
Referring to fig. 8, an embodiment of the disclosure provides a device for controlling start-stop of a water chiller, including: an acquisition module 801 and a control module 802. The acquisition module 801 is configured to acquire air supply parameters and operating parameters of the chiller. The control module 802 is configured to control the start-up or shut-down of the chiller based on the obtained air supply parameters and the operating parameters.
By adopting the device for controlling the start and stop of the water chilling unit, which is provided by the embodiment of the disclosure, the start or stop of the water chilling unit is controlled by acquiring the air supply parameter and the operation parameter of the water chilling unit. Thus, according to the operation parameters of the water chilling unit and by combining the air supply characteristic of the water chilling unit with the air suspension compressor, the start and stop of the water chilling unit are controlled. The control method not only can perfect the start-stop protection control process of the unit and improve the control precision, but also can avoid frequent start-stop of the unit, thereby prolonging the service life of the unit.
As shown in conjunction with fig. 9, an embodiment of the present disclosure provides an apparatus for controlling start-stop of a water chiller, including a processor (processor) 900 and a memory (memory) 901. Optionally, the apparatus may also include a communication interface (Communication Interface) 902 and a bus 903. The processor 900, the communication interface 902, and the memory 901 may communicate with each other via the bus 903. The communication interface 902 may be used for information transfer. Processor 900 may invoke logic instructions in memory 901 to perform the method for controlling chiller start and stop of the above-described embodiments.
Further, the logic instructions in the memory 901 may be implemented in the form of a software functional unit and may be stored in a computer readable storage medium when sold or used as a separate product.
The memory 901 is a computer readable storage medium, and may be used to store a software program, a computer executable program, and program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 900 executes the program instructions/modules stored in the memory 901 to perform the functional applications and data processing, i.e. implement the method for controlling start-stop of the chiller in the above embodiment.
The memory 901 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for functions; the storage data area may store data created according to the use of the terminal device, etc. Further, the memory 901 may include a high-speed random access memory, and may also include a nonvolatile memory.
The embodiment of the disclosure provides a water chiller, comprising: the refrigerant circulation loop, the air supply pipeline 40 and the device for controlling the start and stop of the water chilling unit. The refrigerant circulation circuit includes: a gas suspension compressor 10, a condenser 20 and an evaporator 30. The specific implementation process of the air suspension compressor 10, the condenser 20, the evaporator 30 and the air supply line 40 is just described in the above embodiments, and will not be described herein.
The embodiment of the disclosure provides a storage medium storing computer executable instructions configured to perform the above method for controlling start-stop of a chiller.
The storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.
The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, when used in this application, the terms "comprises," "comprising," and/or "includes," and variations thereof, mean that the stated features, integers, steps, operations, elements, and/or components are present, but that the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.
Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. The skilled artisan may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units may be merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present disclosure 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 flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than that disclosed in the description, and sometimes no specific order exists between different operations or steps. For example, two consecutive operations or steps may actually be performed substantially in parallel, they may sometimes be performed in reverse order, which may be dependent on the functions involved. Each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims (9)

1. A method for controlling start-stop of a water chiller, the water chiller comprising: the condenser is communicated with the air supply tank through a condensation air supply pipeline and is configured to supplement refrigerant to the air supply tank; the evaporator is communicated with the air supply tank through an evaporation air supply pipeline; the air supply parameters include: a gas supply tank level and a condenser level; the method comprises the following steps:
acquiring air supply parameters and operation parameters of a water chilling unit;
controlling the start or stop of the water chilling unit according to the acquired air supply parameters and the operation parameters; wherein,,
the control of the start of the water chilling unit comprises: controlling the pre-starting of the water chilling unit according to the air supply parameters;
controlling the pre-starting of the water chilling unit according to the air supply parameter comprises the following steps:
if H Tank ≤H 1 And X is Cold water ％>X, controlling the condenser to supplement refrigerant to the air supply tank;
if H Tank ≤H 1 And X is Cold water The concentration of the refrigerant is less than or equal to X percent, and the condenser and the evaporator are controlled to supplement the refrigerant to the air supply tank at the same time;
if H Tank >H 1 And X is Cold water ％>X, controlling the heating device to be started;
wherein H is Tank For supplying liquid level of gas tank, H 1 For the first liquid level threshold value, X Cold water % is condenser liquid level, x% is second liquid level threshold;
the control of the shutdown of the water chilling unit comprises the following steps: controlling the water chilling unit to stop for protection according to the air supply parameters;
the controlling the shutdown protection of the water chilling unit according to the air supply parameter comprises the following steps:
controlling the condensation air supply pipeline to be disconnected;
controlling the evaporation air supply pipeline to be communicated and controlling the air supply tank to supply air to a bearing of the air suspension compressor under the condition that the air supply tank liquid level value is larger than a third liquid level threshold value and smaller than a fourth liquid level threshold value;
under the condition that the liquid level value of the air supply tank reaches a fourth liquid level threshold value, controlling the flow of the evaporation air supply pipeline to be reduced until the flow is reduced to zero;
and controlling the heating device to stop running.
2. The method of claim 1, wherein controlling the start of the chiller according to the obtained air supply parameters and the operation parameters further comprises:
and after the pre-starting of the water chilling unit is finished, controlling the water chilling unit to be formally started according to the operation parameters.
3. The method of claim 2, wherein the chiller comprises: an air suspension compressor and a chilled water pump; the operating parameters include: the outlet water temperature of the chilled water and the operating parameters of the air suspension compressor; and controlling the formal starting of the water chiller according to the operation parameters, wherein the method comprises the following steps of:
controlling the starting of a chilled water pump;
and controlling the water chiller to formally start under the condition that the outlet water temperature of the chilled water is greater than a first temperature threshold value and lasts for a first preset time period and the operation parameters of the air suspension compressor meet the starting conditions.
4. A method according to claim 3, wherein the operating parameters of the gas suspension compressor meet a start-up condition, comprising:
the failure number of the air suspension compressors is smaller than the preset number; and, a step of, in the first embodiment,
the shutdown time interval of the air suspension compressor is larger than a preset time interval.
5. The method of claim 1, wherein controlling the chiller to shut down based on the obtained air supply parameters and the operating parameters further comprises:
and controlling the water chilling unit to stop according to the operation parameters.
6. The method of claim 5, wherein the operating parameters comprise: the outlet water temperature of the chilled water, the fault number of the air suspension compressor and the compression ratio of the air suspension compressor; and controlling the water chilling unit to stop according to the operation parameters, wherein the method comprises the following steps of:
controlling the water chilling unit to stop under the condition that the compression ratio of the air suspension compressor is larger than or equal to a compression ratio threshold value and lasts for a second preset time period, and the outlet water temperature of the chilled water is smaller than a second temperature threshold value and lasts for a third preset time period; or,
controlling the water chilling unit to stop under the condition that the fault number of the air suspension compressors is the total number of compressors of the water chilling unit; or,
and controlling the water chilling unit to stop under the condition that the compression ratios of all the gas suspension compressors are smaller than a stop compression ratio threshold value.
7. The method of claim 5, wherein the chiller comprises: the air supply tank and the driving pump are arranged on the condensation air supply pipeline.
8. An apparatus for controlling start-stop of a water chiller comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for controlling start-stop of a water chiller as claimed in any one of claims 1 to 7 when the program instructions are executed.
9. A chiller, comprising:
a refrigerant circulation circuit comprising: a gas suspension compressor, a condenser and an evaporator;
a gas supply line comprising:
the inlet of the condensation air supply pipeline is communicated with the condenser;
the inlet of the evaporation air supply pipeline is communicated with the evaporator;
the inlet of the main pipeline is communicated with the outlet of the condensation air supply pipeline and the outlet of the evaporation air supply pipeline through a three-way valve, and the outlet of the main pipeline is communicated with the air supply port of the air suspension compressor;
the air supply tank is arranged on the main pipeline;
the driving pump is arranged on the main pipeline;
the heating device is arranged in the air supply tank;
the chilled water pump is communicated with the evaporator; and, a step of, in the first embodiment,
the apparatus for controlling start-stop of a chiller according to claim 8.
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