CN102338444A - Ice-storage control method for supercooled water direct-current frequency conversion ice-storage multi-connected air conditioner - Google Patents
Ice-storage control method for supercooled water direct-current frequency conversion ice-storage multi-connected air conditioner Download PDFInfo
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Abstract
The invention provides an ice-storage control method for a supercooled water direct-current frequency conversion ice-storage multi-connected air conditioner. The method comprises the following steps of: A, controlling a starting condition; B, controlling a starting process of a unit; C, controlling an ice-making process; and D, controlling ice storage termination. In the ice-storage control method for the supercooled water direct-current frequency conversion ice-storage multi-connected air conditioner, a compressor motor is high in efficiency and stability, and the ice-storage efficiency is high and can reach 80 to 90 percent.
Description
Technical field:
The present invention relates to air-conditioning equipment control technology field, specifically, is a kind of ice-reserving control method of subcooled water formula DC frequency-changing ice cold-storage combined air conditioners device.
Background technology:
The ice cold-storage has obtained very big development in recent years as a kind of means of effective peak load shifting.On August 30th, 2006, disclosed application number was that 200610034853.2 patent has proposed a kind of Overcold ice-storage air-conditioning unit; This Overcold ice cold-storage unit comprises ice storage unit, closed circulation pipeline and three outer contacts; This closed circulation pipeline is through this ice storage unit; One electric expansion valve and three magnetic valves are arranged, electric expansion valve and one of them magnetic valve parallel connection, two other magnetic valve parallel connection on the closed circulation pipeline; Wherein the first outer contact is positioned at electric expansion valve one side, and the second outer contact is connected to a magnetic valve between the magnetic valve and the above-mentioned second outer contact between magnetic valve and ice storage unit, and the other end of magnetic valve is the 3rd outer contact.Control through to the various magnetic valves in this Overcold ice cold-storage unit can realize the switching of ice-reserving, ice-melt refrigeration, conventional refrigeration, heat pump, accumulation of heat and six kinds of operational modes of heat release.Adopt the weak point of this Overcold ice-storage air-conditioning unit and control mode thereof to be: the first, this ice-storage air-conditioning unit adopts digital vortex formula compressor; On this compressor essence; Remain invariable frequency compressor, have the not high defective of electric efficiency; The second, this ice-reserving control method belongs to static ice-reserving, promptly forms ice sheet on the surface of ice making coil pipe, in static ice-reserving process; Growth along with ice sheet; Thermal resistance between water and cold-producing medium or the catalyst carrier constantly increases, and system increases with energy consumption, and system effectiveness sharply descends; The ice making rate has only about 50%, and ice making efficient is low.
Summary of the invention:
The technical problem that the present invention will solve is, overcomes existing technological deficiency, and the ice-reserving control method of the high subcooled water formula DC frequency-changing ice cold-storage combined air conditioners device of a kind of electric efficiency height and ice making efficient is provided.
Technical solution of the present invention is, a kind of ice-reserving control method of subcooled water formula DC frequency-changing ice cold-storage combined air conditioners device is provided, and it may further comprise the steps:
A, entry condition control:
(1), receives when opening the ice-make mode signal through remote controller or line control machine or central controller or building control system when aircondition; Ice making control system passes to the off-premises station electric-control system with starting-up signal through connection, and the off-premises station electric-control system sends start-up command;
(2), detect the water level in the Ice Storage Tank this moment, if the Ice Storage Tank middle water level is in full-water level, unit begins to start, if when the Ice Storage Tank middle water level is not enough, then opens water supply electromagnetic valve water filling in Ice Storage Tank, is in full-water level until the Ice Storage Tank middle water level;
B: the unit starting process control when unit satisfies entry condition, gets into start-up course:
(3), at first, first closed electromagnetic valve, second magnetic valve and the 3rd closed electromagnetic valve, the 4th magnetic valve is opened, and the 5th magnetic valve is opened, and the 6th magnetic valve is opened, and the supercooled water water circulating pump is opened;
(4), the aperture of first electric expansion valve opens to 250～350 pulses of benchmark aperture, the aperture of second electric expansion valve is opened to 120～150 pulses, and makes the electric expansion valves that join indoor sets all be in closed condition more; The blower motors that join indoor set all are in closed condition more; The electric expansion valve that heats of off-premises station is opened to 450 pulses, gas bypass unloading magnetic valve is opened the four-way change-over valve power down again; The liquid bypass solenoid valve is closed, the low tension switch shielding;
(5), gas bypass unloading magnetic valve opens time-delay after 20 seconds, DC frequency-changeable compressor begins to start, when the DC frequency-changeable compressor running frequency rises to 30Hz; Move 60 seconds, rise to 64Hz from 30Hz again and continue operation, first invariable frequency compressor is after DC frequency-changeable compressor starts 10 seconds; Begin to start, second invariable frequency compressor begins to start after DC frequency-changeable compressor starts 20 seconds; Gas bypass unloading magnetic valve starts operation after 50 seconds at DC frequency-changeable compressor, closes, and the outdoor fan motor starts operation after 45 seconds at DC frequency-changeable compressor; Start, and control automatically according to outdoor coil pipe used middle part temperature and outdoor environment temperature;
(6), when DC frequency-changeable compressor in the operation of the running frequency of 64Hz after 100 seconds, start-up course finishes, and gets into ice-making process;
C, ice-making process control:
(7), the control of compressor: DC frequency-changeable compressor is after withdrawing from start-up course; Running frequency rises to 90Hz, and DC frequency-changeable compressor is downconverted to 70Hz operation 10min behind 90Hz continuous service 60min; Return to 90Hz behind the 10min again and continue operation; In the control procedure of compressor, detect the delivery temperature of compressor in real time
When the DC frequency-changeable compressor delivery temperature is higher than 90 ℃, and when being lower than 95 ℃, DC frequency-changeable compressor (1) is raising frequency at a slow speed, raising frequency speed 1Hz/10s,
When the DC frequency-changeable compressor delivery temperature is higher than 95 ℃, and when being lower than 103 ℃, DC frequency-changeable compressor (1) keeps current frequency operation,
When the DC frequency-changeable compressor delivery temperature is higher than 103 ℃, and when being lower than 105 ℃, DC frequency-changeable compressor (1) frequency reducing at a slow speed, frequency reducing speed 1Hz/10s,
When the DC frequency-changeable compressor delivery temperature is higher than 105 ℃, and when being lower than 110 ℃, DC frequency-changeable compressor (1) frequency reducing fast, frequency reducing speed 1Hz/s,
When the DC frequency-changeable compressor delivery temperature is higher than 110 ℃, and when being lower than 115 ℃, DC frequency-changeable compressor (1) frequency reducing fast, frequency reducing speed 2Hz/s,
When the DC frequency-changeable compressor delivery temperature is higher than 115 ℃, and when continuing 10 seconds, whole air-conditioning compressor emergency shutdown; Behind the 3min, the air-conditioning unit restarts and the ice-make mode operation, if in 60min; DC frequency-changeable compressor delivery temperature protectiveness is shut down 3 times; Then whole air-conditioning compressor emergency shutdown is until manual start
When the invariable frequency compressor delivery temperature is higher than 120 ℃, and continue 10 seconds, then stop invariable frequency compressor immediately, when the invariable frequency compressor delivery temperature was lower than 90 ℃, invariable frequency compressor restarted;
(8), the control of subcooler; At first; Setup parameter: the datum target evaporating temperature of subcooler evaporimeter inner refrigerant is set at-15 ℃～-10 ℃, and the datum target degree of superheat of subcooler evaporimeter inner refrigerant is 1 ℃～2 ℃, and the accent valve cycle of second electric expansion valve of control subcooler is 10～20 seconds; Detect the delivery temperature of DC frequency-changeable compressor; The aperture of regulating second electric expansion valve is that benchmark aperture+degree of superheat is transferred the valve step number, and it is the electronic expansion valve opening according to the target degree of superheat and the adjustment of degree of superheat variable quantity that the degree of superheat is transferred the valve step number, the target degree of superheat=datum target degree of superheat+delivery temperature degree of superheat regulated quantity; The degree of superheat=evaporator outlet temperature-evaporator temperature; Degree of superheat variable quantity=current the degree of superheat-previous moment degree of superheat, the benchmark aperture of said second electric expansion valve is 120～150 pulses
When delivery temperature has ascendant trend, and during delivery temperature≤70 ℃, make delivery temperature degree of superheat regulated quantity=0 ℃,
When delivery temperature has ascendant trend, and during delivery temperature＞100 ℃, make delivery temperature degree of superheat regulated quantity=1 ℃～2 ℃,
When delivery temperature has downward trend, and during delivery temperature >=75 ℃, make delivery temperature degree of superheat regulated quantity=0 ℃,
When delivery temperature has downward trend, and during delivery temperature＜65 ℃, make delivery temperature degree of superheat regulated quantity=-1 ℃～-2 ℃;
(9), ice crystal is eliminated the control of heat exchanger; The target evaporating temperature that ice crystal is eliminated heat exchanger evaporimeter inner refrigerant is set at 10 ℃～20 ℃; The target degree of superheat that ice crystal is eliminated heat exchanger evaporimeter inner refrigerant is 1 ℃～2 ℃; Ice crystal is eliminated first electric expansion valve of heat exchanger and is transferred 10～20 seconds valve cycles; The aperture of first electric expansion valve=benchmark aperture+degree of superheat is transferred the valve step number, and the benchmark aperture of first electric expansion valve is 250～350 pulses, and the said degree of superheat transfers the valve step number to select according to the different intervals of the degree of superheat and degree of superheat variable quantity;
D, ice-reserving finish: when ice-reserving reaches ice-reserving time of setting in the program or the water level in the Ice Storage Tank running time and reaches the water level that ice-reserving requires, withdraw from the ice-reserving process:
(10), the liquid supply electromagnetic valve on total feed pipe is closed;
(11), DC frequency-changeable compressor is downconverted to 30Hz operation, after 10 seconds, first invariable frequency compressor and second invariable frequency compressor are shut down, the 5th magnetic valve, the 6th closed electromagnetic valve, first electric expansion valve and second electric expansion valve are closed; When low tension switch was experienced the minimum pressure value, DC frequency-changeable compressor was shut down;
(12), all compressor shutdown is after 60 seconds, the supercooled water water circulating pump cuts out.
After adopting said method, the present invention has the following advantages:
In start-up course control with in the ice-reserving process control, adopt DC frequency-changeable compressor and invariable frequency compressor to use as the compressor of off-premises station simultaneously in the ice-reserving control method of off-premises station subcooled water formula DC frequency-changing ice cold-storage combined air conditioners device of the present invention, compressor electric motor efficient is higher.
And the present invention controls the refrigerant flow in the subcooler through the aperture of controlling second electric expansion valve in ice-making process, and then the temperature of the supercooled water in the control subcooler; Control the flow that ice crystal is eliminated the cold-producing medium in the heat exchanger through the aperture of controlling first electric expansion valve, and then the control ice crystal is eliminated the temperature of mixture of ice and water in the heat exchanger, the elimination ice crystal; This method adopts the continuous ice-reserving of subcooled water formula, and water is cooled in subcooler, becomes the supercooling state at cooler outlet; The supercooled water temperature is at-2 ℃～-4 ℃, and afterwards, supercooled water is got on the supercooled water cancellation element; Through the collision produce power supercooled water being eliminated gradually is the mixture of ice and water about 0 ℃, and ice is stayed in the Ice Storage Tank, and water is separated; Ice crystal during process ice crystal elimination heat exchanger goes out to anhydrate is fully accomplished the ice making circulation thereby get into once more in the subcooler, this mode ice sheet is not grown at heat exchange surface; With the carrying out and change of ice-reserving process, therefore, subcooled water ice-reserving procedures system stability is not high for thermal resistance between water and cold-producing medium or the catalyst carrier; Ice-reserving efficient is high, and ice-reserving efficient can reach 80%～90%.
Description of drawings:
Accompanying drawing 1 is the system architecture sketch map that the ice-reserving control method of subcooled water formula DC frequency-changing of the present invention ice cold-storage combined air conditioners device is just wanted the subcooled water formula DC frequency-changing ice cold-storage combined air conditioners device of your pipe.
Accompanying drawing 2 is enlarged diagrams of a portion among Fig. 1.
Accompanying drawing 3 is enlarged diagrams of b portion among Fig. 1.
Accompanying drawing 4 is enlarged diagrams of c portion among Fig. 1.
As shown in the figure: 1, frequency-changeable compressor; 2, first invariable frequency compressor; 3, second invariable frequency compressor; 4.1, the first oil return capillary; 4.2, the second oil return capillary; 4.3, the 3rd oil return capillary; 5.1, the first compressor air-discharging check valve, 5.2, the second compressor air-discharging check valve; 5.3, the 3rd compressor air-discharging check valve; 6.1, downtake pipe compiles threeway; 6.2, second exhaust pipe compiles threeway; 7, gs-oil separator; 8, gs-oil separator outlet check valve; 9, high-voltage switch gear; 10, gas bypass unloading magnetic valve; 11, four-way change-over valve; 12, outdoor heat exchanger; 13, outdoor fan motor; 14, Y-type three way type; 15, heat electric expansion valve; 16, bypass check valve; 17, high pressure reservoir; 18, liquid bypass solenoid valve; 19, liquid bypass capillary; 20, the 4th magnetic valve; 21, total return-air stop valve; 22, total feed flow stop valve; 23, liquid pipe branch pipe; 24, tracheorrhaphy manifold; 25, first electric expansion valve; 26, the 5th magnetic valve; 27, the 6th magnetic valve; 28, second electric expansion valve; 29, first check valve; 30, Ice Storage Tank; 31, water supply electromagnetic valve; 32.1, first ball-cock assembly; 32.2, second ball-cock assembly; 33, sub-cooling coil; 34, ice crystal combination of filters; 35, subcooler; 36, ice crystal is eliminated heat exchanger; 37, supercooled water water circulating pump; 38, indoor set; 39, indoor electric expansion valve; 40, indoor set system; 41.1, first branch pipe; 41.2, second branch pipe; 41.3, the 3rd branch pipe; 41.4, the 4th branch pipe; 42, gas-liquid separator; 43, low tension switch; 44, subcooled water cancellation element; 45, second check valve; 46, the 3rd check valve; 47, first magnetic valve; 48.1, a T type threeway; 48.2, the 2nd T type threeway, 49, subsidiary water tank; 50, stop valve; 51, second magnetic valve; 52, the 3rd magnetic valve; 53, temperature sensor.
The specific embodiment:
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed explanation.
As shown in the figure: a kind of subcooled water formula DC frequency-changing ice cold-storage combined air conditioners device that the present invention relates to, by at least one group of off-premises station module, an ice storage system and organize indoor apparatus of air conditioner more and form.
Off-premises station is made up of primary module and submodule, and submodule can not have, and submodule can have only one, and submodule also can have many, can reach 4 estrade modules at most, but a primary module must be arranged.
Each off-premises station module mainly comprises: DC frequency-changeable compressor 1; First invariable frequency compressor 2; Second invariable frequency compressor 3; The first oil return capillary 4.1; The second oil return capillary 4.2; The 3rd oil return capillary 4.3; The first compressor air-discharging check valve 5.1; The second compressor air-discharging check valve 5.2; The 3rd compressor air-discharging check valve 5.3; Downtake pipe compiles threeway 6.1; Second exhaust pipe compiles threeway 6.2; Gs-oil separator 7; Gs-oil separator outlet check valve 8; High-voltage switch gear 9; Gas bypass unloading magnetic valve 10; Four-way change-over valve 11; Outdoor heat exchanger 12; Outdoor fan motor 13; First Y-type three way type 14.1; Second Y-type three way type 14.2; Heat electric expansion valve 15; Bypass check valve 16; High pressure reservoir 17; Liquid bypass solenoid valve 18; Liquid bypass capillary 19; The 4th magnetic valve 20; Total return-air stop valve 21; Total feed flow stop valve 22; Liquid pipe branch pipe 23; Tracheorrhaphy manifold 24; Gas-liquid separator 42; Low tension switch 43 etc.
Ice storage system comprises: first electric expansion valve 25; The 5th magnetic valve 26; The 6th magnetic valve 27; Electric expansion valve 28; First check valve 29; Ice Storage Tank 30; Water supply electromagnetic valve 31; First ball-cock assembly 32.1; Second ball-cock assembly 32.2; Sub-cooling coil 33; Ice crystal combination of filters 34; Subcooler 35; Ice crystal is eliminated heat exchanger 36; Supercooled water water circulating pump 37; First branch pipe 41.1; Second branch pipe 41.2; The 3rd branch pipe 41.3; The 4th branch pipe 41.4; Subcooled water cancellation element 44; Second check valve 45; The 3rd check valve 46; First magnetic valve 47; The one T type threeway 48.1; The 2nd T type threeway 48.2; Subsidiary water tank 49; Stop valve 50; Second magnetic valve 51; The 3rd magnetic valve 52; Temperature sensor 53 etc.
Indoor set 40 comprises: indoor set 38, indoor electric expansion valve 39 etc.The ability size and the quantity of described indoor set 38 decide according to air-conditioned room load character and air-conditioning area.
The connected mode of described off-premises station module is a parallel connection type, and promptly the total feed pipe of all module off-premises stations is connected by branch pipe 23, and total muffler is connected by branch pipe 24.
The described DC frequency-changeable compressor 1 and first invariable frequency compressor 2 and second invariable frequency compressor 3 are connected in parallel, and mainly are that blast pipe is connected in parallel, and muffler is connected in parallel.According to off-premises station ability size, the parallel connection of 2 compressors can be arranged, the parallel connection of three compressors also can be arranged.
Described gas bypass unloading magnetic valve 10 is connected between gs-oil separator 7 outlets and gas-liquid separator 42 inlet tubes, and it mainly acts on and is, the pressure of balance high-pressure side and low-pressure side when unit is started shooting preceding and shutdown; When compressor exhaust temperature was too high, opens solenoid valve 10 was to reduce compressor exhaust temperature; When the compressor air suction hypotony, opens solenoid valve 10 is to improve compressor return air pressure.
Described liquid bypass solenoid valve 18 and liquid bypass capillary 19 are connected between high pressure reservoir 12 outlets and gas-liquid separator 42 inlet tubes.It mainly acts on, and when compressor exhaust temperature is too high, opens liquid bypass solenoid valve 18, to reduce compressor exhaust temperature; When the compressor air suction hypotony, open liquid bypass solenoid valve 18, to improve compressor return air pressure.
Described oil return capillary 4.1,4.2,4.3 is connected between gs-oil separator 7 bottoms and the associated compressors muffler.It mainly acts on, and isolated lubricating oil in the gs-oil separator 7 is drawn back the compressor muffler, avoids the compressor oil starvation.
Described the 4th magnetic valve 20 is installed on total feed pipe, and its effect is when this module is shut down, to close, and prevents that the high-pressure refrigerant of the off-premises station module of other operation from flowing backwards in this module off-premises station.
Describedly heat electric expansion valve 15 and 16 parallel connections of bypass check valve, during the refrigeration mode operation, the high pressure, high temperature refrigerant of outdoor heat exchanger 12 condensations gets in the high pressure reservoirs 12 with bypass check valve 16 through heating electric expansion valve 15; When heating mode moved, the liquid refrigerant that is come out by high pressure reservoir 12 can only still can not pass through bypass check valve 16 through heating electric expansion valve 15 throttling cooling and step-downs.
Described high-voltage switch gear 9 is installed on the outlet of gs-oil separator 7, and its effect is a control unit high pressure, prevents that the pipe-line system internal pressure is too high and the danger of booster takes place.
Described low tension switch 43 is installed on the muffler of compressor 1, and its effect is to prevent system pipeline mesolow side, and particularly compressor return air pipe place low pressure is low excessively.
From refrigeration principle, all as the indoor heat exchanger of off-premises station, the three is the parallel connection relation to indoor set 38 in described subcooler 35 and ice crystal elimination heat exchanger 36 and the indoor set system 40.
The effect of described ice crystal combination of filters 34 is the ice crystals that filter in the chilled water of supercooled water water circulating pump 37, prevents that ice crystal from getting in the supercooling system.
The effect that described ice crystal is eliminated heat exchanger 36 is; Through the chilled water before the heating entering subcooler 35; The not filtrable tiny ice crystal of ice crystal combination of filters 34 is melted, prevent that tiny ice crystal from getting into subcooler 35, freezes and obstruction subcooled water circulation line in heat exchanger tube.
The effect of described subcooler 35 is, utilize cold-producing medium directly the effect of evaporation will manage interior chilled water and cross and be chilled to-2 ℃～-4 ℃.
The effect of described subcooled water cancellation element 44 is, when the subcooled water that forms through subcooler 35 is ejected into 44 last times of subcooled water cancellation element, because subcooled water collides and the rising water temperature with it, eliminates degree of supercooling, and temperature rises to 0 ℃, and at this moment, chilled water begins to freeze.Because the percussion of chilled water flow, the ice on subcooled water cancellation element 44 slips in the Ice Storage Tank 30, forms mixture of ice and water.
The effect of described the 5th magnetic valve 26 is that in the ice-reserving running, the 5th magnetic valve 26 is opened; , the ice-reserving running closes when finishing.
The effect of described the 6th magnetic valve 27 is that in the ice-reserving running, the 6th magnetic valve 27 is opened; , the ice-reserving running closes when finishing.
Described first check valve 29 is installed in subcooler 35 refrigerant outlet places, and its effect is to prevent that the cold-producing medium of ice crystal elimination heat exchanger 36 exit elevated pressures from flowing backward in the subcooler 35.
Described first ball-cock assembly 32.1 is installed in the water surface elevation places that set in the Ice Storage Tank 30, and its effect is to keep water level in the Ice Storage Tank 30 at desired location.When the water surface in the Ice Storage Tank 30 descends, inspire 32.1 actions of first ball-cock assembly, and signal is issued water supply electromagnetic valve 31, impel water supply electromagnetic valve 31 to open, water filling in Ice Storage Tank 30 reaches designated water level until water level.
Height of water level place when described second ball-cock assembly 32.2 is installed in the ice making rate that Ice Storage Tank sets, the ice making rate that obtains in the ice-reserving process meets the demands, and when reaching designated water level, 32.2 actions of second ball-cock assembly stop the ice-reserving running.
The effect of described second check valve 45 and the 3rd check valve 46 is that when kind of refrigeration cycle was moved, cold-producing medium can flow through check valve, formed the circulatory system of sealing; When heating circular flow, prevent to get into ice storage system and increase friction loss at the liquid cold-producing medium of the condensed HTHP of indoor pusher side.
The effect of described first magnetic valve 47 is, when system during in the refrigerating operaton pattern, first magnetic valve 47 cuts out; When system during in the heating operation pattern, first magnetic valve 47 is opened, and with the liquid refrigerant bypass of the condensed HTHP of indoor pusher side, and needn't pass through the pipeline of ice storage system, thereby reduce friction loss.
The effect of described subsidiary water tank 49 is, when the chilled water quantity not sufficient in the Ice Storage Tank 30, opens water supply electromagnetic valve 31, and the water in the subsidiary water tank 49 are replenished into Ice Storage Tank 30.
The effect of described second magnetic valve 51 and the 3rd magnetic valve 52 is, when unit operation during at the ice-reserving running, second magnetic valve 51 and the 3rd magnetic valve 52 are closed; When at air conditioner refrigerating and heating process, second magnetic valve 51 and the 3rd magnetic valve 52 are opened.
The effect of described temperature sensor 53 is that the control ice crystal is eliminated heat exchanger 36 leaving water temperatures, through regulating the aperture of first electric expansion valve 25, guarantees that ice crystal elimination heat exchanger 36 leaving water temperatures are at 0.5 ℃.
The present invention is based on above-mentioned subcooled water formula DC frequency-changing ice cold-storage combined air conditioners device, a kind of ice-reserving control method of subcooled water formula DC frequency-changing ice cold-storage combined air conditioners device is provided, it may further comprise the steps:
A, entry condition control:
(1), receives when opening the ice-make mode signal through remote controller or line control machine or central controller or building control system when aircondition; Ice making control system passes to the off-premises station electric-control system with starting-up signal through connection, and the off-premises station electric-control system sends start-up command;
(2), detect the water level in the Ice Storage Tank this moment, if the Ice Storage Tank middle water level is in full-water level, unit begins to start, if when the Ice Storage Tank middle water level is not enough, then opens water supply electromagnetic valve water filling in Ice Storage Tank, is in full-water level until the Ice Storage Tank middle water level;
B: the unit starting process control when unit satisfies entry condition, gets into start-up course:
(3), at first, first closed electromagnetic valve, second magnetic valve and the 3rd closed electromagnetic valve, the 4th magnetic valve is opened, and the 5th magnetic valve is opened, and the 6th magnetic valve is opened, and the supercooled water water circulating pump is opened;
(4), the aperture of first electric expansion valve opens to 250～350 pulses of benchmark aperture, the aperture of second electric expansion valve is opened to 120～150 pulses, and makes the electric expansion valves that join indoor sets all be in closed condition more; The blower motors that join indoor set all are in closed condition more; The electric expansion valve that heats of off-premises station is opened to 450 pulses, gas bypass unloading magnetic valve is opened the four-way change-over valve power down again; The liquid bypass solenoid valve is closed, the low tension switch shielding;
(5), gas bypass unloading magnetic valve opens time-delay after 20 seconds, DC frequency-changeable compressor begins to start, when the DC frequency-changeable compressor running frequency rises to 30Hz; Move 60 seconds, rise to 64Hz from 30Hz again and continue operation, first invariable frequency compressor is after DC frequency-changeable compressor starts 10 seconds; Begin to start, second invariable frequency compressor begins to start after DC frequency-changeable compressor starts 20 seconds; Gas bypass unloading magnetic valve starts operation after 50 seconds at DC frequency-changeable compressor, closes, and the outdoor fan motor starts operation after 45 seconds at DC frequency-changeable compressor; Start, and control automatically according to outdoor coil pipe used middle part temperature and outdoor environment temperature;
(6), when DC frequency-changeable compressor in the operation of the running frequency of 64Hz after 100 seconds, start-up course finishes, and gets into ice-making process;
C, ice-making process control:
(7), the control of compressor: DC frequency-changeable compressor is after withdrawing from start-up course; Running frequency rises to 90Hz, and DC frequency-changeable compressor is downconverted to 70Hz operation 10min behind 90Hz continuous service 60min; Return to 90Hz behind the 10min again and continue operation; In the control procedure of compressor, detect the delivery temperature of compressor in real time
When the DC frequency-changeable compressor delivery temperature is higher than 90 ℃, and when being lower than 95 ℃, DC frequency-changeable compressor (1) is raising frequency at a slow speed, raising frequency speed 1Hz/10s,
When the DC frequency-changeable compressor delivery temperature is higher than 95 ℃, and when being lower than 103 ℃, DC frequency-changeable compressor (1) keeps current frequency operation,
When the DC frequency-changeable compressor delivery temperature is higher than 103 ℃, and when being lower than 105 ℃, DC frequency-changeable compressor (1) frequency reducing at a slow speed, frequency reducing speed 1Hz/10s,
When the DC frequency-changeable compressor delivery temperature is higher than 105 ℃, and when being lower than 110 ℃, DC frequency-changeable compressor (1) frequency reducing fast, frequency reducing speed 1Hz/s,
When the DC frequency-changeable compressor delivery temperature is higher than 110 ℃, and when being lower than 115 ℃, DC frequency-changeable compressor (1) frequency reducing fast, frequency reducing speed 2Hz/s,
When the DC frequency-changeable compressor delivery temperature is higher than 115 ℃, and when continuing 10 seconds, whole air-conditioning compressor emergency shutdown; Behind the 3min, the air-conditioning unit restarts and the ice-make mode operation, if in 60min; DC frequency-changeable compressor delivery temperature protectiveness is shut down 3 times; Then whole air-conditioning compressor emergency shutdown is until manual start
When the invariable frequency compressor delivery temperature is higher than 120 ℃, and continue 10 seconds, then stop invariable frequency compressor immediately, when the invariable frequency compressor delivery temperature was lower than 90 ℃, invariable frequency compressor restarted.
(8), the control of subcooler; At first; Setup parameter: the datum target evaporating temperature of subcooler evaporimeter inner refrigerant is set at-15 ℃～-10 ℃, and the datum target degree of superheat of subcooler evaporimeter inner refrigerant is 1 ℃～2 ℃, and the accent valve cycle of second electric expansion valve of control subcooler is 10～20 seconds; Detect the delivery temperature of DC frequency-changeable compressor; The aperture of regulating second electric expansion valve is that benchmark aperture+degree of superheat is transferred the valve step number, and it is the electronic expansion valve opening according to the target degree of superheat and the adjustment of degree of superheat variable quantity that the degree of superheat is transferred the valve step number, the target degree of superheat=datum target degree of superheat+delivery temperature degree of superheat regulated quantity; The degree of superheat=evaporator outlet temperature-evaporator temperature; Degree of superheat variable quantity=current the degree of superheat-previous moment degree of superheat, the benchmark aperture of said second electric expansion valve is 120～150 pulses
When delivery temperature has ascendant trend, and during delivery temperature≤70 ℃, make delivery temperature degree of superheat regulated quantity=0 ℃,
When delivery temperature has ascendant trend, and during delivery temperature＞100 ℃, make delivery temperature degree of superheat regulated quantity=1 ℃～2 ℃,
When delivery temperature has downward trend, and during delivery temperature >=75 ℃, make delivery temperature degree of superheat regulated quantity=0 ℃,
When delivery temperature has downward trend, and during delivery temperature＜65 ℃, make delivery temperature degree of superheat regulated quantity=-1 ℃～-2 ℃;
The said degree of superheat transfers the valve step number for to select according to the different intervals of the degree of superheat and degree of superheat variable quantity, shown in the table specific as follows:
(9), ice crystal is eliminated the control of heat exchanger; The target evaporating temperature that ice crystal is eliminated heat exchanger evaporimeter inner refrigerant is set at 10 ℃～20 ℃; The target degree of superheat that ice crystal is eliminated heat exchanger evaporimeter inner refrigerant is 1 ℃～2 ℃; Ice crystal is eliminated the-electric expansion valve of heat exchanger and is transferred 10～20 seconds valve cycles, and the aperture of first electric expansion valve=benchmark aperture+degree of superheat is transferred the valve step number, and the benchmark aperture of first electric expansion valve is 250～350 pulses; The said degree of superheat transfers the valve step number to select according to the different intervals of the degree of superheat and degree of superheat variable quantity, shown in the table specific as follows:
D, ice-reserving finish: when ice-reserving reaches ice-reserving time of setting in the program or the water level in the Ice Storage Tank running time and reaches the water level that ice-reserving requires, withdraw from the ice-reserving process:
(10), the liquid supply electromagnetic valve on total feed pipe is closed;
(11), DC frequency-changeable compressor is downconverted to 30Hz operation, after 10 seconds, first invariable frequency compressor and second invariable frequency compressor are shut down, the 5th magnetic valve, the 6th closed electromagnetic valve, first electric expansion valve and second electric expansion valve are closed; When low tension switch was experienced the minimum pressure value, DC frequency-changeable compressor was shut down;
(12), all compressor shutdown is after 60 seconds, the supercooled water water circulating pump cuts out.
Claims (1)
1. the ice-reserving control method of subcooled water formula DC frequency-changing ice cold-storage combined air conditioners device, it is characterized in that: it may further comprise the steps:
A, entry condition control:
(1), receives when opening the ice-make mode signal through remote controller or line control machine or central controller or building control system when aircondition; Ice making control system passes to the off-premises station electric-control system with starting-up signal through connection, and the off-premises station electric-control system sends start-up command;
(2), detect the water level in the Ice Storage Tank (30) this moment; If Ice Storage Tank (30) middle water level is in full-water level, unit begins to start, when not enough as if Ice Storage Tank (30) middle water level; Then open water supply electromagnetic valve (31) water filling in Ice Storage Tank (30), be in full-water level until Ice Storage Tank (30) middle water level;
B: the unit starting process control when unit satisfies entry condition, gets into start-up course:
(3), at first, first magnetic valve (47) cuts out, and second magnetic valve (51) and the 3rd magnetic valve (52) are closed, and the 4th magnetic valve (20) is opened, and the 5th magnetic valve (26) is opened, and the 6th magnetic valve (27) is opened, and supercooled water water circulating pump (37) is opened;
(4), the aperture of first electric expansion valve (25) opens to 250～350 pulses of benchmark aperture, the aperture of second electric expansion valve (28) is opened to 120～150 pulses, and makes the electric expansion valves that join indoor sets all be in closed condition more; The blower motors that join indoor set all are in closed condition more; The electric expansion valve that heats of off-premises station is opened to 450 pulses, gas bypass unloading magnetic valve (10) is opened, four-way change-over valve (11) power down again; Liquid bypass solenoid valve (18) is closed, low tension switch (43) shielding;
(5), gas bypass unloading magnetic valve (10) opens time-delay after 20 seconds, DC frequency-changeable compressor (1) begins to start, when DC frequency-changeable compressor (1) when running frequency rises to 30Hz; Move 60 seconds, rise to 64Hz from 30Hz again and continue operation, first invariable frequency compressor (2) is after DC frequency-changeable compressor (1) starts 10 seconds; Begin to start; Second invariable frequency compressor (3) begins to start after DC frequency-changeable compressor (1) starts 20 seconds, and gas bypass unloading magnetic valve (10) starts operation after 50 seconds at DC frequency-changeable compressor (1); Close; Outdoor fan motor (13) starts operation after 45 seconds at DC frequency-changeable compressor (1), starts, and controls automatically according to outdoor coil pipe used middle part temperature and outdoor environment temperature;
(6), when DC frequency-changeable compressor (1) in the operation of the running frequency of 64Hz after 100 seconds, start-up course finishes, and gets into ice-making process;
C, ice-making process control:
(7), the control of compressor: DC frequency-changeable compressor (1) is after withdrawing from start-up course; Running frequency rises to 90Hz, and DC frequency-changeable compressor (1) is downconverted to 70Hz operation 10min behind 90Hz continuous service 60min; Return to 90Hz behind the 10min again and continue operation; In the control procedure of compressor, detect the delivery temperature of compressor in real time
When DC frequency-changeable compressor (1) delivery temperature is higher than 90 ℃, and when being lower than 95 ℃, DC frequency-changeable compressor (1) is raising frequency at a slow speed, raising frequency speed 1Hz/10s,
When DC frequency-changeable compressor (1) delivery temperature is higher than 95 ℃, and when being lower than 103 ℃, DC frequency-changeable compressor (1) keeps current frequency operation,
When DC frequency-changeable compressor (1) delivery temperature is higher than 103 ℃, and when being lower than 105 ℃, DC frequency-changeable compressor (1) frequency reducing at a slow speed, frequency reducing speed 1Hz/10s,
When DC frequency-changeable compressor (1) delivery temperature is higher than 105 ℃, and when being lower than 110 ℃, DC frequency-changeable compressor (1) frequency reducing fast, frequency reducing speed 1Hz/s,
When DC frequency-changeable compressor (1) delivery temperature is higher than 110 ℃, and when being lower than 115 ℃, DC frequency-changeable compressor (1) frequency reducing fast, frequency reducing speed 2Hz/s,
When DC frequency-changeable compressor (1) delivery temperature is higher than 115 ℃, and when continuing 10 seconds, whole air-conditioning compressor emergency shutdown; Behind the 3min, the air-conditioning unit restarts and the ice-make mode operation, if in 60min; DC frequency-changeable compressor (1) delivery temperature protectiveness is shut down 3 times; Then whole air-conditioning compressor emergency shutdown is until manual start
When the invariable frequency compressor delivery temperature is higher than 120 ℃, and continue 10 seconds, then stop invariable frequency compressor immediately, when the invariable frequency compressor delivery temperature was lower than 90 ℃, invariable frequency compressor restarted;
(8), the control of subcooler; At first; Setup parameter: the datum target evaporating temperature of subcooler (35) evaporimeter inner refrigerant is set at-15 ℃～-10 ℃, and the datum target degree of superheat of subcooler (35) evaporimeter inner refrigerant is 1 ℃～2 ℃, and the accent valve cycle of second electric expansion valve (28) of control subcooler (35) is 10～20 seconds; Detect the delivery temperature of DC frequency-changeable compressor (1); The aperture of regulating second electric expansion valve (28) is that benchmark aperture+degree of superheat is transferred the valve step number, and it is the electronic expansion valve opening according to the target degree of superheat and the adjustment of degree of superheat variable quantity that the degree of superheat is transferred the valve step number, the target degree of superheat=datum target degree of superheat+delivery temperature degree of superheat regulated quantity; The degree of superheat=evaporator outlet temperature-evaporator temperature; Degree of superheat variable quantity=current the degree of superheat-previous moment degree of superheat, the benchmark aperture of said second electric expansion valve (28) is 120～150 pulses
When delivery temperature has ascendant trend, and during delivery temperature≤70 ℃, make delivery temperature degree of superheat regulated quantity=0 ℃,
When delivery temperature has ascendant trend, and during delivery temperature＞100 ℃, make delivery temperature degree of superheat regulated quantity=1 ℃～2 ℃,
When delivery temperature has downward trend, and during delivery temperature >=75 ℃, make delivery temperature degree of superheat regulated quantity=0 ℃,
When delivery temperature has downward trend, and during delivery temperature＜65 ℃, make delivery temperature degree of superheat regulated quantity=-1 ℃～-2 ℃;
(9), ice crystal is eliminated the control of heat exchanger; The target evaporating temperature that ice crystal is eliminated heat exchanger (36) evaporimeter inner refrigerant is set at 10 ℃～20 ℃; The target degree of superheat that ice crystal is eliminated heat exchanger (36) evaporimeter inner refrigerant is 1 ℃～2 ℃; Ice crystal is eliminated first electric expansion valve (25) of heat exchanger (36) and is transferred 10～20 seconds valve cycles; The aperture of first electric expansion valve (25)=benchmark aperture+degree of superheat is transferred the valve step number, and the benchmark aperture of first electric expansion valve (25) is 250～350 pulses, and the said degree of superheat transfers the valve step number to select according to the different intervals of the degree of superheat and degree of superheat variable quantity;
D, ice-reserving finish: when ice-reserving reaches ice-reserving time of setting in the program or the water level in the Ice Storage Tank (30) running time and reaches the water level that ice-reserving requires, withdraw from the ice-reserving process:
(10), the liquid supply electromagnetic valve (20) on total feed pipe is closed;
(11), DC frequency-changeable compressor (1) is downconverted to the 30Hz operation; After 10 seconds; First invariable frequency compressor (2) and second invariable frequency compressor (3) are shut down, and the 5th magnetic valve (26), the 6th magnetic valve (27) are closed, and first electric expansion valve (25) and second electric expansion valve (28) are closed; When low tension switch (43) was experienced the minimum pressure value, DC frequency-changeable compressor (1) was shut down;
(12), all compressor shutdown is after 60 seconds, supercooled water water circulating pump (37) cuts out.
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Address after: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee after: NINGBO AUX ELECTRIC CO., LTD. Address before: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee before: Ningbo AUX Electric Co., Ltd. |