CN103322711A - Turbine refrigerator and control method thereof - Google Patents
Turbine refrigerator and control method thereof Download PDFInfo
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- CN103322711A CN103322711A CN2013100874716A CN201310087471A CN103322711A CN 103322711 A CN103322711 A CN 103322711A CN 2013100874716 A CN2013100874716 A CN 2013100874716A CN 201310087471 A CN201310087471 A CN 201310087471A CN 103322711 A CN103322711 A CN 103322711A
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Abstract
The invention provides a turbine refrigerator and a control method thereof. The turbine refrigerator can make the refrigeration capacity infinitely lowered to approximately zero. The turbine refrigerator comprises a control device (20) calculating the refrigeration capacity of the turbine refrigerator at least according to the temperature of cold water flowing inside an evaporator (5). With the decrease in the refrigeration capacity, the control device (20) performs a first control step to a fourth control step in the following order. In the first control step, the rotating speed of a multi-stage turbine compressor (TC) is lowered through an inverter (14). In the second control step, the opening degree of a blade (15) is reduced. In the third control step, a control valve (7) is closed. The control valve (7) is arranged on a flow path (11) making an energy saver (6) communicated with a multi-stage turbine compressor (TC). In the fourth control step, a hot air bypass valve (26) is opened.
Description
Technical field
The present invention relates to possess the turborefrigerator of energy-saving appliance, particularly relate to turborefrigerator and the control method thereof of using the multi-stage compression economizer cycle.
Background technology
In the past, the turborefrigerator that utilizes in the refrigerating air conditioning device etc., there is the closed system of cold-producing medium to consist of by inclosure, will be from cold water (fluid is cooled) thus capture heat and make the evaporimeter of cold-producing medium evaporation performance refrigeration, will be by above-mentioned evaporator evaporation the refrigerant gas compression, make it become the compressor of the refrigerant gas of high pressure, by cooling water (cooling fluid) refrigerant gas of high pressure is cooled off and make the condenser of its condensation, above-mentioned condensed cold-producing medium is reduced pressure and the expansion valve (expansion mechanism) that makes its expansion links by refrigerant piping and consists of.And, the compound compressor that refrigerant gas carries out multi-stage compression is used as in the situation of compressor by multi-stage impeller in use, carry out to be directed into the action (for example, patent documentation 1) of the intergrade (mid portion of multi-stage impeller) of compressor by the refrigerant gas that the intercooler in the refrigerant piping that is arranged between condenser and the evaporimeter that is energy-saving appliance produce.
Patent documentation 1: TOHKEMY 2009-236430 communique
In turborefrigerator, sometimes require according to the running environment its refrigeration capacity (refrigerating capacity) to be reduced near zero.Yet turborefrigerator in the past but can't make refrigeration capacity be reduced near zero, thereby can't satisfy such requirement.
Summary of the invention
The present invention makes in order to solve above-mentioned problem in the past, and its purpose is to provide and can makes refrigeration capacity ad infinitum drop near zero turborefrigerator and control method thereof.
For achieving the above object, the first mode of the present invention is a kind of turborefrigerator, possesses: evaporimeter, thus it is captured heat and refrigeration is brought into play in the cold-producing medium evaporation from the fluid that is cooled; Multistage turbocompressor, its by multi-stage impeller with refrigerant compression; Condenser, the refrigerant gas after it utilizes cooling fluid to compression cools off so that its condensation; Intercooler that is energy-saving appliance, its make the part evaporation of condensed refrigerant liquid and will evaporate after refrigerant gas be supplied to the mid portion of the multi-stage compression level of described multistage turbocompressor, described turborefrigerator is characterised in that, possess: control valve, it is arranged in described energy-saving appliance and the stream that the mid portion of the multi-stage compression level of described multistage turbocompressor is communicated with, and described stream is opened and closed; The hot-gas bypass stream, it makes compressed described refrigerant gas not by described energy-saving appliance but returns described evaporimeter from described condenser; Hot gas bypass valve, it is arranged at described hot-gas bypass stream; Control device, it calculates the refrigeration capacity of described turborefrigerator at least according to the temperature of the cold water that flows in described evaporimeter, and described multistage turbocompressor possesses: compressor motor, it makes described multi-stage impeller rotation; Inverter, it drives described compressor motor; The blade that aperture is variable, it is adjusted to the inhalation flow of the refrigerant gas of described multi-stage impeller suction, described control device is carried out the first～the 4th control step in the following sequence along with the reduction of described refrigeration capacity: the first control step makes the rotary speed of described multistage turbocompressor reduce via described inverter; Second controls step, reduces the aperture of described blade; The 3rd control step is closed described control valve; The 4th control step is opened described hot gas bypass valve.
The second mode of the present invention is a kind of turborefrigerator, possesses: evaporimeter, thus it is captured heat and refrigeration is brought into play in the cold-producing medium evaporation from the fluid that is cooled; Multistage turbocompressor, its by multi-stage impeller with refrigerant compression; Condenser, the refrigerant gas after it utilizes cooling fluid to compression cools off so that its condensation; Intercooler that is energy-saving appliance, its make the part evaporation of condensed refrigerant liquid and will evaporate after refrigerant gas be supplied to the mid portion of the multi-stage compression level of described multistage turbocompressor, described turborefrigerator is characterised in that, possess: control valve, it is arranged in described energy-saving appliance and the stream that the mid portion of the multi-stage compression level of described multistage turbocompressor is communicated with, and described stream is opened and closed; The hot-gas bypass stream, it makes compressed described refrigerant gas not by described energy-saving appliance but returns described evaporimeter from described condenser; Hot gas bypass valve, it is arranged at described hot-gas bypass stream; Control device, it calculates the refrigeration capacity of described turborefrigerator at least according to the temperature of the cold water that flows in described evaporimeter, and described multistage turbocompressor possesses: compressor motor, it makes described multi-stage impeller rotation; The blade that aperture is variable, it is adjusted to the inhalation flow of the refrigerant gas of described multi-stage impeller suction, described control device is along with the reduction of described refrigeration capacity, and carry out in the following sequence the first～the 3rd control step: first controls step, reduces the aperture of described blade; The second control step is closed described control valve; The 3rd control step is opened described hot gas bypass valve.
Other modes of the present invention are control methods of a kind of turborefrigerator, and this turborefrigerator possesses: evaporimeter, thus it is captured heat and refrigeration is brought into play in the cold-producing medium evaporation from the fluid that is cooled; Multistage turbocompressor, its by multi-stage impeller with refrigerant compression; Condenser, the refrigerant gas after it utilizes cooling fluid to compression cools off so that its condensation; Intercooler that is energy-saving appliance, its make the part evaporation of condensed refrigerant liquid and will evaporate after refrigerant gas be supplied to the mid portion of the multi-stage compression level of described multistage turbocompressor; Control valve, it is arranged in described energy-saving appliance and the stream that the mid portion of the multi-stage compression level of described multistage turbocompressor is communicated with, and described stream is opened and closed; The hot-gas bypass stream, it makes compressed described refrigerant gas not by described energy-saving appliance but returns described evaporimeter from described condenser; Hot gas bypass valve, it is arranged at described hot-gas bypass stream; Control device, it calculates the refrigeration capacity of described turborefrigerator at least according to the temperature of the cold water that flows in described evaporimeter, the control method of described turborefrigerator is characterised in that, carry out in the following sequence the first～the 4th control step along with the reduction of described refrigeration capacity: the first control step, the rotary speed of described multistage turbocompressor is reduced, and wherein said inverter is used for driving the compressor motor that links with described multi-stage impeller; Second controls step, reduces the aperture of blade, and wherein said blade adjustment is to the inhalation flow of the refrigerant gas of described multi-stage impeller suction; The 3rd control step is closed described control valve; The 4th control step is opened described hot gas bypass valve.
An again mode of the present invention is a kind of control method of turborefrigerator, and this turborefrigerator possesses: evaporimeter, thus it is captured heat and refrigeration is brought into play in the cold-producing medium evaporation from the fluid that is cooled; Multistage turbocompressor, its by multi-stage impeller with refrigerant compression; Condenser, the refrigerant gas after it utilizes cooling fluid to compression cools off so that its condensation; Intercooler that is energy-saving appliance, its make the part evaporation of condensed refrigerant liquid and will evaporate after refrigerant gas be supplied to the mid portion of the multi-stage compression level of described multistage turbocompressor; Control valve, it is arranged in described energy-saving appliance and the stream that the mid portion of the multi-stage compression level of described multistage turbocompressor is communicated with, and described stream is opened and closed; The hot-gas bypass stream, it makes compressed described refrigerant gas not by described energy-saving appliance but returns described evaporimeter from described condenser; Hot gas bypass valve, it is arranged at described hot-gas bypass stream; Control device, it calculates the refrigeration capacity of described turborefrigerator at least according to the temperature of the cold water that flows in described evaporimeter, the control method of described turborefrigerator is characterised in that, carry out in the following sequence the first～the 3rd control step along with the reduction of described refrigeration capacity: the first control step, reduce the aperture of blade, wherein said blade adjustment is to the inhalation flow of the refrigerant gas of described multi-stage impeller suction; The second control step is closed described control valve; The 3rd control step is opened described hot gas bypass valve.
According to the first mode of the present invention, control by following 4 stages, refrigeration capacity is dropped near zero, that is: the rotary speed control of (1) multistage turbocompressor of being undertaken by inverter, (2) aperture of blade control, (3) stopping of economizer cycle, (4) hot-gas bypass.Therefore the low load operation of turborefrigerator becomes possibility.
According to the second mode of the present invention, even in the turborefrigerator that does not possess inverter, refrigeration capacity is dropped near zero.That is, by the control in following 3 stages, refrigeration capacity is dropped near zero, the control of the aperture of (1) blade, (2) economizer cycle stop (3) hot-gas bypass.Therefore the low load operation of turborefrigerator becomes possibility.
Description of drawings
Fig. 1 is the schematic diagram of an embodiment of expression turborefrigerator of the present invention.
Fig. 2 is the control that represents according to 4 stages, the operation range of turborefrigerator is divided into the curve map of four situation.
Fig. 3 is the mollier diagram that describes for to the situation that by closed control valve refrigeration capacity is reduced in the 3rd control step.
Fig. 4 is the schematic diagram of other embodiments of expression turborefrigerator of the present invention.
The explanation of Reference numeral: 1 ... first order impeller; 2 ... second level impeller; 3 ... compressor motor; 4 ... condenser; 5 ... evaporimeter; 6 ... energy-saving appliance; 7 ... control valve; 8 ... expansion mechanism; 9,10,11 ... stream; 14 ... inverter; 15 ... blade; 20 ... control device; 25 ... the hot-gas bypass stream; 26 ... hot gas bypass valve; LV ... liquid level meter; S1, S2 ... temperature sensor; FM ... flowmeter; TC ... multistage turbocompressor.
The specific embodiment
Below, describe with reference to the embodiment of accompanying drawing to turborefrigerator of the present invention and control method thereof.In Fig. 1 to Fig. 4, for identical or suitable inscape, also the repetitive description thereof will be omitted to mark identical Reference numeral.
Fig. 1 is the schematic diagram of an embodiment of expression turborefrigerator of the present invention.In embodiment shown in Figure 1, the turborefrigerator that has used two-stage compression single-stage economizer cycle is described.As shown in Figure 1, turborefrigerator possesses: the multistage turbocompressor TC of compressed refrigerant; Refrigerant gas after utilizing cooling water (cooling fluid) to compression cools off so that the condenser 4 of its condensation; From cold water (fluid is cooled) thus capture heat and with the evaporimeter 5 of cold-producing medium evaporation performance refrigeration; Be configured in intercooler that is energy-saving appliance 6 between condenser 4 and the evaporimeter 5; Be arranged on the front and back of energy-saving appliance 6 and to condensating refrigerant decompression so that the expansion mechanism 8,8 of its expansion, above-mentioned each equipment linked by the refrigerant piping 9 for refrigerant circulation consist of turborefrigerator.
In embodiment shown in Figure 1, multistage turbocompressor TC is made of the two-stage turbine compressor, constitutes to comprise: first order impeller 1, second level impeller 2, drive above-mentioned impeller 1,2 compressor motor 3 and the inverter 14 of drive compression machine motor 3.Compressor motor 3 and can carry out speed change by inverter 14 with the impeller 1 of its link, 2 rotary speed.Inverter 14 is connected with control device 20 in addition, and compressor motor 3 and impeller 1,2 rotary speed are controlled by control device 20 via inverter 14.
Be provided with the adjustment refrigerant gas in the suction side of first order impeller 1 to the blade (vane) 15 of impeller 1,2 inhalation flows that suck.This blade 15 configures radially, each blade 15 centered by the axle center of self, phase mutually synchronization and the angle of rotation regulation only, change thus the aperture of blade 15.For the vibration (surging) that prevents multistage turbocompressor TC, the minimum aperture of blade 15 is not 0 °, and blade 15 is closed fully.For example, the minimum aperture of blade 15 is 10 °.The aperture of blade 15 is controlled by control device 20.
The suction side that the discharge side of first order impeller 1 is connected with second level impeller connects by stream 10.In multistage turbocompressor TC, be fed to the refrigerant gas of first order impeller 1 from evaporimeter 5, carry out first order compression by first order impeller 1, then be fed to the refrigerant gas of second level impeller 2 by stream 10, carry out second level compression by second level impeller 2, afterwards, be sent to condenser 4.
Energy-saving appliance 6 be connected stream 10 and connect by stream 11, by the refrigerant gas that energy-saving appliance 6 separates, be fed to the mid portion (being the part between the first order and the second level in this example) of the multi-stage compression level (being two-stage in this example) of multistage turbocompressor TC.Liquid level in the energy-saving appliance 6 utilizes liquid level meter LV to measure, and its measured value is sent to control device 20.Be provided with DYN dynamic control valve 7 at the stream 11 that connects energy-saving appliance 6 and multistage turbocompressor TC, this control valve 7 can stop to control to supply and the supply of the compression stage of refrigerant gas from energy-saving appliance 6 to multistage turbocompressor TC.Control valve 7 constitutes its aperture and can adjust, and for example uses the variable motor-driven valve of aperture as control valve 7.The aperture of control valve 7 is controlled by control device 20.
In the kind of refrigeration cycle of the turborefrigerator that consists of as shown in Figure 1, cold-producing medium circulates in multistage turbocompressor TC, condenser 4, evaporimeter 5 and energy-saving appliance 6, the Cooling and Heat Source that utilization is obtained by evaporimeter 5 is made cold water and corresponding with load, is taken into the heat that comes flash-pot 5 in the kind of refrigeration cycle and the heat suitable with the merit of the multistage turbocompressor TC that supplies with from compressor motor 3 and is released to the cooling water that is supplied to condenser 4.On the other hand, separated refrigerant gas is directed to the mid portion of the multi-stage compression level of multistage turbocompressor TC by energy-saving appliance 6, and compresses from the refrigerant gas of first order compressor 1 interflow and by high stage compressor 2.Adopt two stages of compression single-stage economizer cycle, owing to being attached with the refrigeration part that energy-saving appliance 6 is realized, so this partial response ground can increase refrigeration, compares with the situation that energy-saving appliance 6 is not set, and can increase refrigeration.
As shown in Figure 1, turborefrigerator possesses: the hot-gas bypass stream 25 that refrigerant gas is guided to evaporimeter 5 from condenser 4; Be used for opening and closing the hot gas bypass valve 26 of this hot-gas bypass stream 25.Hot gas bypass valve 26 constitutes its aperture and can adjust, and for example is made of the variable motor-driven valve of aperture.In common cooling operation, hot gas bypass valve 26 is closed.If open hot gas bypass valve 26, the refrigerant gas that is then compressed by multistage turbocompressor TC is without energy-saving appliance 6 but be sent to evaporimeter 5 from condenser 4.
Turborefrigerator also possesses: the temperature sensor S1 of the first temperature measuring device of temperature that flow into the cold water of evaporimeter 5 as mensuration; As the temperature sensor S2 of mensuration from the second temperature measuring device of the temperature of the cold water of evaporimeter 5 outflows; The flowmeter FM that the flow of the cold water that flows at evaporimeter 5 is measured.Temperature sensor S1, S2 and flowmeter FM are connected with control device 20, and the output valve of temperature sensor S1, S2 and flowmeter FM is sent to control device 20.
Control device 20, the flow of the cold water of obtaining according to the difference Δ T of the cold water inlet temperature T 1 that is obtained by temperature sensor S1, S2 and cold water outlet temperature T2 and by flowmeter FM calculates the current refrigeration capacity of refrigeration machine.More specifically, can obtain current cooling load according to the amassing of flow of temperature difference Δ T and cold water.Perhaps, control device 20 also can only calculate the current refrigeration capacity of refrigeration machine according to cold water inlet temperature T 1.In this situation, also can omit flowmeter FM.
Control device 20 control inverters 14, blade 15, control valve 7 and hot gas bypass valve 26 are so that cold water outlet temperature T2 is maintained the target temperature of regulation.Under the flow of the cold water that flows through evaporimeter 5 was constant condition, the refrigeration capacity of turborefrigerator (cooling load) depended on cold water inlet temperature T 1.That is, if cold water inlet temperature T 1 step-down then needs to reduce the refrigeration capacity of turborefrigerator.In recent years, exist to require refrigeration capacity with turborefrigerator to be reduced to situation less than 20%.Refrigeration machine of the present invention, by 4 stage controls of following explanation, can make its refrigeration capacity continuously (successfully namely) be reduced near zero.
That is, control device 20 reduces refrigeration capacity by following 4 stages:
(1) the rotary speed control of the multistage turbocompressor TC that is undertaken by inverter 14,
(2) aperture of blade 15 control,
(3) stopping of the economizer cycle that realizes by closed control valve 7,
(4) hot-gas bypass.
In the first control step, along with the refrigeration capacity that calculates reduces, the output frequency of control device 20 control inverters 14 and impeller 1,2 rotary speed are reduced.If refrigeration capacity further reduces and reach the value of regulation, then as the second control step, control device 20 reduces the aperture of blade 15.The aperture of blade 15 reduces along with the reduction of refrigeration capacity.
Blade 15 is closed to its minimum aperture if refrigeration capacity further reduces, and then as the 3rd control step, control device 20 reduces the aperture of control valve 7.The aperture of control valve 7 reduces along with the reduction of refrigeration capacity.Control valve 7 is closed fully if refrigeration capacity further reduces, and then as the 4th control step, control device 20 is opened hot gas bypass valve 26.Particularly, after control valve 7 is closed fully, the aperture of hot gas bypass valve 26 is increased along with the reduction of refrigeration capacity.
Like this, according to the refrigeration capacity of obtaining by computing, carry out in the following sequence: control (the 3rd control step) and the hot gas bypass valve control (the 4th control step) of the economizer cycle of carrying out with inverter control (the first control step), blade control (the second control step), by control valve 7 can make the refrigeration capacity (cooling load) of turborefrigerator be reduced near 0% from 100% thus.
Fig. 2 is the control that represents according to above-mentioned 4 stages, the operation range of turborefrigerator is divided into the curve map of four situation.Vibrational line shown in Figure 2 is if be that the running head is with respect to the too high line that then causes vibration of the inhalation flow of multistage turbocompressor TC.Therefore turborefrigerator may turn round in the zone below the upper limit line in the running that is lower than this vibrational line.As shown in Figure 2, the operation range of turborefrigerator is split into four zones: inverter control zone, blade control area, economizer cycle control area and hot gas bypass valve control area.Because turborefrigerator according to the running of four control steps, therefore can make the refrigeration capacity (refrigerating capacity) of turborefrigerator successfully reduce like this.Particularly according to the present invention, can make refrigeration capacity successfully (continuously) be reduced near 0% from 100%.
Fig. 3 is the mollier diagram that describes for to the situation that by closed control valve 7 refrigeration capacity is reduced in the 3rd control step.The refrigeration that realizes by energy-saving appliance 6 when control valve 7 is opened represents with oblique line section shown in Figure 3.If closed control valve 7 then disappears by the refrigeration that energy-saving appliance 6 is realized, therefore can not reduce the inhalation flow of the cold-producing medium that sucks to multistage turbocompressor TC and refrigeration capacity is reduced, lower efficiency significantly in the time of can preventing low load operation.For example, be that 32 ℃, cold water outlet temperature T2 are under 7 ℃ the temperature conditions in cold water inlet temperature T 1, refrigeration capacity can be reduced approximately 15% by closed control valve 7.The aperture of this control valve 7 can be adjusted in 0～100% scope, therefore in the 3rd control step refrigeration capacity is successfully reduced.
As other embodiments, can also use the valve (that is, can't carry out the valve that aperture is adjusted) that only carries out on-off action as control valve 7.In this situation, in the 3rd control step, the result of closed control valve 7 is that refrigeration capacity sharply reduces.For fear of the reduction of so rapid refrigeration capacity, preferably in the 3rd control step in closed control valve 7, increase the aperture of blade 15.This moment, the aperture of blade was for cold water outlet temperature T2 being maintained the required aperture of target temperature, depended on the operating condition of this moment and changed.The opportunity of open blade 15, when also can not close with control valve 7, but after firm closed control valve 7.
The aperture of the blade 15 behind the open blade 15 is controlled according to the current refrigeration capacity of obtaining by computing.Afterwards, when refrigeration capacity further reduces and blade 15 when being closed to minimum aperture, next carry out above-mentioned the 4th control step.That is, as mentioned above, open hot gas bypass valve 26 according to current refrigeration capacity.
Adopt present embodiment, by in closed control valve 7 or increase at once afterwards the aperture of blade 15, can avoid thus the rapid reduction of refrigeration capacity, and successfully reduce refrigeration capacity.In addition, only can use the valve of the simple structure that flow path 11 merely opens and closes as control valve 7.Therefore use the existing turborefrigerator of the valve of such structure also can be suitable for present embodiment.
As an embodiment again, can also use the valve (that is, can't carry out the valve that aperture is adjusted) that only carries out on-off action as hot gas bypass valve 26.In this situation, in the 4th control step, the result who opens hot gas bypass valve 26 is that refrigeration capacity sharply reduces.For fear of the reduction of so rapid refrigeration capacity, preferably same with above-mentioned embodiment, when the 4th control is being opened hot gas bypass valve 26 in the step or increase at once afterwards the aperture of blade 15.This moment blade aperture, be for cold water outlet temperature T2 being maintained the required aperture of target temperature, depend on the operating condition of this moment and change.After this, the aperture of blade 15 is controlled according to the current refrigeration capacity of obtaining by computing.
In more detail present embodiment is described.In the situation that the 4th control is being opened hot gas bypass valve 26 in the step, when opening hot gas bypass valve 26 or afterwards, increase at once the aperture of blade 15.The aperture of the blade of this moment is for cold water outlet temperature T2 being maintained the required aperture of target temperature.After this, along with refrigeration capacity reduces, the aperture of blade 15 is reduced.
Like this, by when opening hot gas bypass valve 26 or afterwards, increase at once the aperture of blade 15, can avoid thus the rapid reduction of refrigeration capacity, refrigeration capacity is successfully descended.Only can use in addition merely the valve of the simple structure that hot-gas bypass stream 25 is opened and closed as hot gas bypass valve 26.Therefore, the existing turborefrigerator for the valve that uses such structure also can be suitable for present embodiment.
Above-mentioned turborefrigerator is the type that possesses inverter, but as shown in Figure 4, also has the turborefrigerator of the type that does not possess inverter.In the turborefrigerator of the type, by 3 following stage controls, can make its refrigeration capacity continuously (successfully namely) be reduced near zero.
(1) aperture of blade control (the first control step)
(2) the stopping of the economizer cycle that realizes by closed control valve 7 (the second control step)
(3) hot-gas bypass (the 3rd control step)
Above-mentioned the first～the 3rd control step is carried out in the same manner with the second～the 4th above-mentioned control step.Therefore the turborefrigerator of the type also can make its refrigeration capacity be reduced to continuously near zero.
Hereto, embodiments of the present invention are illustrated, but self-evident the present invention is not limited to above-mentioned embodiment, but can in the scope of its technological thought, implements in a variety of ways.
Claims (12)
1. turborefrigerator possesses: evaporimeter, thus it captures heat and with cold-producing medium evaporation performance refrigeration from the fluid that is cooled; Multistage turbocompressor, its by multi-stage impeller with refrigerant compression; Condenser, the refrigerant gas after it utilizes cooling fluid to compression cools off so that its condensation; Intercooler that is energy-saving appliance, its make the part evaporation of condensed refrigerant liquid and will evaporate after refrigerant gas be supplied to the mid portion of the multi-stage compression level of described multistage turbocompressor, described turborefrigerator is characterised in that to possess:
Control valve, it is arranged in described energy-saving appliance and the stream that the mid portion of the multi-stage compression level of described multistage turbocompressor is communicated with, and described stream is opened and closed;
The hot-gas bypass stream, it makes compressed described refrigerant gas not by described energy-saving appliance but returns described evaporimeter from described condenser;
Hot gas bypass valve, it is arranged at described hot-gas bypass stream;
Control device, it calculates the refrigeration capacity of described turborefrigerator at least according to the temperature of the cold water that flows in described evaporimeter,
Described multistage turbocompressor possesses: compressor motor, and it makes described multi-stage impeller rotation; Inverter, it drives described compressor motor; The blade that aperture is variable, it is adjusted to the inhalation flow of the refrigerant gas of described multi-stage impeller suction,
Described control device is carried out the first～the 4th control step in the following sequence along with the reduction of described refrigeration capacity:
The first control step makes the rotary speed of described multistage turbocompressor reduce via described inverter;
Second controls step, reduces the aperture of described blade;
The 3rd control step is closed described control valve;
The 4th control step is opened described hot gas bypass valve.
2. turborefrigerator as claimed in claim 1 is characterized in that,
Described control valve constitutes its aperture and can change,
In described the 3rd control step, described control device makes the aperture of described control valve reduce along with the reduction of described refrigeration capacity.
3. turborefrigerator as claimed in claim 1 is characterized in that,
In described the 3rd control step, described control device when cutting out described control valve or afterwards increases the aperture of described blade at once.
4. turborefrigerator as claimed in claim 1 is characterized in that,
Described control valve constitutes its aperture and can change,
In described the 4th control step, described control device makes the aperture of described hot gas bypass valve reduce along with the reduction of described refrigeration capacity.
5. turborefrigerator as claimed in claim 1 is characterized in that,
In described the 4th control step, described control device when opening described hot gas bypass valve or afterwards increases the aperture of described blade at once.
6. turborefrigerator possesses: evaporimeter, thus it captures heat and with cold-producing medium evaporation performance refrigeration from the fluid that is cooled; Multistage turbocompressor, its by multi-stage impeller with refrigerant compression; Condenser, the refrigerant gas after it utilizes cooling fluid to compression cools off so that its condensation; Intercooler that is energy-saving appliance, its make the part evaporation of condensed refrigerant liquid and will evaporate after refrigerant gas be supplied to the mid portion of the multi-stage compression level of described multistage turbocompressor, described turborefrigerator is characterised in that to possess:
Control valve, it is arranged in described energy-saving appliance and the stream that the mid portion of the multi-stage compression level of described multistage turbocompressor is communicated with, and described stream is opened and closed;
The hot-gas bypass stream, it makes compressed described refrigerant gas not by described energy-saving appliance but returns described evaporimeter from described condenser;
Hot gas bypass valve, it is arranged at described hot-gas bypass stream;
Control device, it calculates the refrigeration capacity of described turborefrigerator at least according to the temperature of the cold water that flows in described evaporimeter,
Described multistage turbocompressor possesses: compressor motor, and it makes described multi-stage impeller rotation; The blade that aperture is variable, it is adjusted to the inhalation flow of the refrigerant gas of described multi-stage impeller suction,
Described control device is carried out the first～the 3rd control step in the following sequence along with the reduction of described refrigeration capacity:
First controls step, reduces the aperture of described blade;
The second control step is closed described control valve;
The 3rd control step is opened described hot gas bypass valve.
7. turborefrigerator as claimed in claim 6 is characterized in that,
Described control valve constitutes its aperture and can change,
In described the second control step, described control device makes the aperture of described control valve reduce along with the reduction of described refrigeration capacity.
8. turborefrigerator as claimed in claim 6 is characterized in that,
In described the second control step, described control device when cutting out described control valve or afterwards increases the aperture of described blade at once.
9. turborefrigerator as claimed in claim 6 is characterized in that,
Described control valve constitutes its aperture and can change,
In described the 3rd control step, described control device makes the aperture of described hot gas bypass valve reduce along with the reduction of described refrigeration capacity.
10. turborefrigerator as claimed in claim 6 is characterized in that,
In described the 3rd control step, described control device when opening described hot gas bypass valve or afterwards increases the aperture of described blade at once.
11. the control method of a turborefrigerator, this turborefrigerator possesses: evaporimeter, thus it is captured heat and refrigeration is brought into play in the cold-producing medium evaporation from the fluid that is cooled; Multistage turbocompressor, its by multi-stage impeller with refrigerant compression; Condenser, the refrigerant gas after it utilizes cooling fluid to compression cools off so that its condensation; Intercooler that is energy-saving appliance, its make the part evaporation of condensed refrigerant liquid and will evaporate after refrigerant gas be supplied to the mid portion of the multi-stage compression level of described multistage turbocompressor; Control valve, it is arranged in described energy-saving appliance and the stream that the mid portion of the multi-stage compression level of described multistage turbocompressor is communicated with, and described stream is opened and closed; The hot-gas bypass stream, it makes compressed described refrigerant gas not by described energy-saving appliance but returns described evaporimeter from described condenser; Hot gas bypass valve, it is arranged at described hot-gas bypass stream; Control device, it calculates the refrigeration capacity of described turborefrigerator at least according to the temperature of the cold water that flows in described evaporimeter, and the control method of described turborefrigerator is characterised in that,
Carry out in the following sequence the first～the 4th control step along with the reduction of described refrigeration capacity:
The first control step makes the rotary speed of described multistage turbocompressor reduce via inverter, wherein said inverter is used for driving the compressor motor that links with described multi-stage impeller;
Second controls step, reduces the aperture of blade, and wherein said blade adjustment is to the inhalation flow of the refrigerant gas of described multi-stage impeller suction;
The 3rd control step is closed described control valve;
The 4th control step is opened described hot gas bypass valve.
12. the control method of a turborefrigerator, this turborefrigerator possesses: evaporimeter, thus it is captured heat and refrigeration is brought into play in the cold-producing medium evaporation from the fluid that is cooled; Multistage turbocompressor, its by multi-stage impeller with refrigerant compression; Condenser, the refrigerant gas after it utilizes cooling fluid to compression cools off so that its condensation; Intercooler that is energy-saving appliance, its make the part evaporation of condensed refrigerant liquid and will evaporate after refrigerant gas be supplied to the mid portion of the multi-stage compression level of described multistage turbocompressor; Control valve, it is arranged in described energy-saving appliance and the stream that the mid portion of the multi-stage compression level of described multistage turbocompressor is communicated with, and described stream is opened and closed; The hot-gas bypass stream, it makes compressed described refrigerant gas not by described energy-saving appliance but returns described evaporimeter from described condenser; Hot gas bypass valve, it is arranged at described hot-gas bypass stream; Control device, it calculates the refrigeration capacity of described turborefrigerator at least according to the temperature of the cold water that flows in described evaporimeter, and the control method of described turborefrigerator is characterised in that,
Carry out in the following sequence the first～the 3rd control step along with the reduction of described refrigeration capacity:
First controls step, reduces the aperture of blade, and wherein said blade adjustment is to the inhalation flow of the refrigerant gas of described multi-stage impeller suction;
The second control step is closed described control valve;
The 3rd control step is opened described hot gas bypass valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012063316A JP5981180B2 (en) | 2012-03-21 | 2012-03-21 | Turbo refrigerator and control method thereof |
| JP2012-063316 | 2012-03-21 |
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| CN103322711A true CN103322711A (en) | 2013-09-25 |
| CN103322711B CN103322711B (en) | 2017-04-26 |
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| CN201320124662.0U Expired - Lifetime CN203240833U (en) | 2012-03-21 | 2013-03-19 | Turbine refrigerating machine |
| CN201310087471.6A Active CN103322711B (en) | 2012-03-21 | 2013-03-19 | Turbine refrigerator and control method thereof |
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| CN201320124662.0U Expired - Lifetime CN203240833U (en) | 2012-03-21 | 2013-03-19 | Turbine refrigerating machine |
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| JP (1) | JP5981180B2 (en) |
| CN (2) | CN203240833U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104864620A (en) * | 2014-02-26 | 2015-08-26 | 荏原冷热系统株式会社 | Centrifugal refrigerator |
| CN106958957A (en) * | 2017-03-31 | 2017-07-18 | 丁金虎 | The centrifugal frequency-changeable compressor group of three-level and control method |
| CN108662799A (en) * | 2017-03-31 | 2018-10-16 | 开利公司 | Multistage refrigerating plant and its control method |
| CN110637202A (en) * | 2017-10-20 | 2019-12-31 | 三菱重工制冷空调系统株式会社 | Control device for refrigeration cycle, heat source device, and control method for heat source device |
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| JP6069179B2 (en) * | 2013-12-04 | 2017-02-01 | 荏原冷熱システム株式会社 | Turbo refrigerator |
| JP6295105B2 (en) * | 2014-03-07 | 2018-03-14 | 荏原冷熱システム株式会社 | Turbo refrigerator |
| JP2015194300A (en) * | 2014-03-31 | 2015-11-05 | 荏原冷熱システム株式会社 | turbo refrigerator |
| JP6826959B2 (en) * | 2017-07-12 | 2021-02-10 | 荏原冷熱システム株式会社 | Compressed refrigerator |
| CN107990496B (en) * | 2017-11-06 | 2019-09-20 | 珠海格力电器股份有限公司 | The control method of air-conditioning between a kind of frozen water type column |
| CN114413548B (en) * | 2021-12-21 | 2022-11-11 | 珠海格力电器股份有限公司 | Variable-frequency centrifugal water chilling unit and control method and storage medium thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103322711B (en) | 2017-04-26 |
| JP5981180B2 (en) | 2016-08-31 |
| CN203240833U (en) | 2013-10-16 |
| JP2013194999A (en) | 2013-09-30 |
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