CN103322711B - Turbine refrigerator and control method thereof - Google Patents

Turbine refrigerator and control method thereof Download PDF

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Publication number
CN103322711B
CN103322711B CN201310087471.6A CN201310087471A CN103322711B CN 103322711 B CN103322711 B CN 103322711B CN 201310087471 A CN201310087471 A CN 201310087471A CN 103322711 B CN103322711 B CN 103322711B
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China
Prior art keywords
control
aperture
determining
rate
turborefrigerator
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CN201310087471.6A
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Chinese (zh)
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CN103322711A (en
Inventor
远藤哲也
入江毅
入江毅一
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荏原冷热系统株式会社
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Priority to JP2012-063316 priority Critical
Priority to JP2012063316A priority patent/JP5981180B2/en
Application filed by 荏原冷热系统株式会社 filed Critical 荏原冷热系统株式会社
Publication of CN103322711A publication Critical patent/CN103322711A/en
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Publication of CN103322711B publication Critical patent/CN103322711B/en

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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

Turborefrigerator and its control method

Technical field

The present invention relates to possess the turborefrigerator of energy-saving appliance, more particularly to using the whirlpool of multi-stage compression economizer cycle Wheel refrigeration machine and its control method.

Background technology

In the past, the turborefrigerator for utilizing in refrigerating air conditioning device etc., is made up of the closed system for being sealed with cold-producing medium, will From cold water(Cooled fluid)Capture heat and make cold-producing medium evaporate so as to play refrigeration vaporizer, will be by above-mentioned evaporation Device vaporized refrigerant gas compression so as to become the compressor of the refrigerant gas of high pressure, by cooling water(Cooling stream Body)The refrigerant gas of high pressure are cooled down and is made the condenser of its condensation, above-mentioned condensed cold-producing medium is reduced pressure And make the expansion valve of its expansion(Expansion mechanism)Linked by refrigerant piping and constituted.And, using by multi-stage impeller In the case that the compound compressor that refrigerant gas carry out multi-stage compression is used as into compressor, enter to be about to by being arranged on condenser The refrigerant gas that the intercooler in refrigerant piping that is, energy-saving appliance between vaporizer is produced are directed into compressor Intergrade(The mid portion of multi-stage impeller)Action(For example, patent documentation 1).

Patent documentation 1:Japanese Unexamined Patent Publication 2009-236430 publications

In turborefrigerator, sometimes require that and make its refrigeration capacity according to operating conditions(Refrigerating capacity)It is reduced to zero attached Closely.However, conventional turborefrigerator cannot but be such that refrigeration capacity is reduced near zero, thus such requirement cannot be met.

The content of the invention

The present invention is above-mentioned conventional made in order to solve the problems, such as, its object is to offer can make refrigeration capacity without Limit ground drops to the turborefrigerator and its control method near zero.

For achieving the above object, the 1st aspect of the present invention, is a kind of turborefrigerator, is possessed:Vaporizer, it is from cold But fluid captures heat and cold-producing medium is evaporated so as to play refrigeration;Multistage turbocompressor, it will by multi-stage impeller Refrigerant compression;Condenser, the refrigerant gas after compression are cooled down using cooling fluid for it so that its condensation;It is middle cold But device that is, energy-saving appliance, it makes the part evaporation of condensed refrigerant liquid and the refrigerant gas after evaporation is supplied to institute The mid portion of the multi-stage compression level of multistage turbocompressor is stated, the turborefrigerator is characterised by possessing:Control valve, It is arranged in the stream for connecting the energy-saving appliance with the mid portion of the multi-stage compression level of the multistage turbocompressor, right The stream is opened and closed;Hot-gas bypass stream, its make the refrigerant gas that compressed by the energy-saving appliance but The vaporizer is returned from the condenser;Hot gas bypass valve, it is arranged at the hot-gas bypass stream;Control device, it is extremely Lack the temperature according to the cold water flowed in the vaporizer to calculate the refrigeration capacity of the turborefrigerator, the multistage whirlpool Wheel compression equipment is standby:Compressor motor, it rotates the multi-stage impeller;Inverter, it drives the compressor motor;Aperture Variable blade, it adjusts the inhalation flow of the refrigerant gas to multi-stage impeller suction, and the control device is with institute State the reduction of refrigeration capacity and perform the first~the 4th rate-determining steps in the following sequence:First rate-determining steps, via the inversion Device and reduce the rotary speed of the multistage turbocompressor;Second rate-determining steps, reduce the aperture of the blade;3rd control Step processed, closes the control valve;4th rate-determining steps, open the hot gas bypass valve.

The 2nd aspect of the present invention, is a kind of turborefrigerator, is possessed:Vaporizer, it captures heat from cooled fluid And cold-producing medium is evaporated so as to play refrigeration;Multistage turbocompressor, it passes through multi-stage impeller by refrigerant compression;Condensation Device, the refrigerant gas after compression are cooled down using cooling fluid for it so that its condensation;Intercooler that is, energy-saving appliance, It makes the part evaporation of condensed refrigerant liquid and the refrigerant gas after evaporation is supplied to multistage turbine compression The mid portion of the multi-stage compression level of machine, the turborefrigerator is characterised by possessing:Control valve, it is arranged on will be described In the stream that energy-saving appliance is connected with the mid portion of the multi-stage compression level of the multistage turbocompressor, the stream is opened Close;Hot-gas bypass stream, it makes the refrigerant gas for being compressed not by the energy-saving appliance but returns from the condenser Return the vaporizer;Hot gas bypass valve, it is arranged at the hot-gas bypass stream;Control device, it is according at least in the steaming Send out the temperature of the cold water flowed in device to calculate the refrigeration capacity of the turborefrigerator, the multistage turbocompressor possesses: Compressor motor, it rotates the multi-stage impeller;The variable blade of aperture, it adjusts the refrigeration to multi-stage impeller suction The inhalation flow of agent gas, the control device performs in the following sequence the first~the 3rd with the reduction of the refrigeration capacity Rate-determining steps:First rate-determining steps, reduce the aperture of the blade;Second rate-determining steps, close the control valve;3rd control Step, opens the hot gas bypass valve.

The other modes of the present invention, are a kind of control methods of turborefrigerator, and the turborefrigerator possesses:Vaporizer, It captures heat and cold-producing medium is evaporated so as to play refrigeration from cooled fluid;Multistage turbocompressor, it passes through many Level impeller is by refrigerant compression;Condenser, the refrigerant gas after compression are cooled down using cooling fluid for it so that its is cold It is solidifying;Intercooler that is, energy-saving appliance, it makes the part evaporation of condensed refrigerant liquid and by the cold-producing medium gas after evaporation Body is supplied to the mid portion of the multi-stage compression level of the multistage turbocompressor;Control valve, it is arranged on the energy-saving appliance In the stream connected with the mid portion of the multi-stage compression level of the multistage turbocompressor, the stream is opened and closed;Heat Gas bypass flow path, it makes the refrigerant gas for being compressed not by the energy-saving appliance but described from condenser return Vaporizer;Hot gas bypass valve, it is arranged at the hot-gas bypass stream;Control device, it is according at least in the vaporizer The temperature of the cold water of flowing is calculating the refrigeration capacity of the turborefrigerator, the feature of the control method of the turborefrigerator It is to perform the first~the 4th rate-determining steps in the following sequence with the reduction of the refrigeration capacity:First rate-determining steps, Jing The rotary speed of the multistage turbocompressor is made by inverter to be reduced, wherein the inverter is multistage with described for driving The compressor motor that impeller links;Second rate-determining steps, reduce the aperture of blade, wherein the blade is adjusted to the multistage leaf The inhalation flow of the refrigerant gas of wheel suction;3rd rate-determining steps, close the control valve;4th rate-determining steps, open institute State hot gas bypass valve.

The still another way of the present invention, is a kind of control method of turborefrigerator, and the turborefrigerator possesses:Vaporizer, It captures heat and cold-producing medium is evaporated so as to play refrigeration from cooled fluid;Multistage turbocompressor, it passes through many Level impeller is by refrigerant compression;Condenser, the refrigerant gas after compression are cooled down using cooling fluid for it so that its is cold It is solidifying;Intercooler that is, energy-saving appliance, it makes the part evaporation of condensed refrigerant liquid and by the cold-producing medium gas after evaporation Body is supplied to the mid portion of the multi-stage compression level of the multistage turbocompressor;Control valve, it is arranged on the energy-saving appliance In the stream connected with the mid portion of the multi-stage compression level of the multistage turbocompressor, the stream is opened and closed;Heat Gas bypass flow path, it makes the refrigerant gas for being compressed not by the energy-saving appliance but described from condenser return Vaporizer;Hot gas bypass valve, it is arranged at the hot-gas bypass stream;Control device, it is according at least in the vaporizer The temperature of the cold water of flowing is calculating the refrigeration capacity of the turborefrigerator, the feature of the control method of the turborefrigerator It is to perform the first~the 3rd rate-determining steps in the following sequence with the reduction of the refrigeration capacity:First rate-determining steps, subtract The aperture of vanelets, wherein the blade adjusts the inhalation flow of the refrigerant gas to multi-stage impeller suction;Second control Step processed, closes the control valve;3rd rate-determining steps, open the hot gas bypass valve.

First method of the invention, by the control in following 4 stages, can make refrigeration capacity drop to zero attached Closely, i.e.,:(1)The rotary speed control of the multistage turbocompressor carried out by inverter,(2)The aperture control of blade,(3)Section The stopping of energy device circulation,(4)Hot-gas bypass.Therefore the low load operation of turborefrigerator is possibly realized.

Second method of the invention, even if in the turborefrigerator for not possessing inverter, it is also possible to hold refrigeration Amount is dropped near zero.That is, by the control in following 3 stages, refrigeration capacity can be made to drop near zero,(1)Blade Aperture is controlled,(2)The stopping of economizer cycle,(3)Hot-gas bypass.Therefore the low load operation of turborefrigerator is possibly realized.

Description of the drawings

Fig. 1 is the schematic diagram of an embodiment of the turborefrigerator for representing the present invention.

Fig. 2 is to represent the control according to 4 stages, and the operation range of turborefrigerator is divided into the curve of the situation of four Figure.

Fig. 3 is that the situation for reducing to being made refrigeration capacity by closing control valve in the 3rd rate-determining steps is said Bright mollier diagram.

Fig. 4 is the schematic diagram of the other embodiment of the turborefrigerator for representing the present invention.

The explanation of reference:1 ... first order impeller;2 ... second level impellers;3 ... compressor motors;4 ... condensers; 5 ... vaporizers;6 ... energy-saving appliances;7 ... control valves;8 ... expansion mechanisms;9th, 10,11 ... stream;14 ... inverters;15 ... blades; 20 ... control devices;25 ... hot-gas bypass streams;26 ... hot gas bypass valves;LV ... liquid level meter;S1, S2 ... temperature sensor; FM ... effusion meters;TC ... multistage turbocompressors.

Specific embodiment

Hereinafter, referring to the drawings to the present invention turborefrigerator and its embodiment of control method is illustrated.In Fig. 1 Into Fig. 4, for element identically or comparably, simultaneously the repetitive description thereof will be omitted for mark identical reference.

Fig. 1 is the schematic diagram of an embodiment of the turborefrigerator for representing the present invention.In the embodiment shown in Fig. 1 In, to being illustrated using the turborefrigerator of two-stage compression single-stage economizer cycle.As shown in figure 1, turborefrigerator tool It is standby:The multistage turbocompressor TC of compression refrigerant;Using cooling water(Cooling fluid)Refrigerant gas after compression are carried out Cooling is so that the condenser 4 of its condensation;From cold water(Cooled fluid)Capture heat and cold-producing medium is evaporated so as to play refrigeration The vaporizer 5 of effect;The intercooler being configured between condenser 4 and vaporizer 5 that is, energy-saving appliance 6;It is arranged on energy-saving appliance 6 Before and after and to condensating refrigerant decompression so that its expansion expansion mechanism 8,8, by above-mentioned each equipment by supplying refrigerant cycle Refrigerant piping 9 link and constitute turborefrigerator.

In the embodiment shown in Fig. 1, multistage turbocompressor TC by two-stage turbine compression mechanism into, be configured to bag Include:First order impeller 1, second level impeller 2, the compressor motor 3 for driving above-mentioned impeller 1,2 and driving compressor motor 3 Inverter 14.The rotary speed of compressor motor 3 and the impeller 1,2 linked with it can carry out speed change by inverter 14. In addition inverter 14 is connected with control device 20, the rotary speed of compressor motor 3 and impeller 1,2 via inverter 14 by Control device 20 is controlled.

The blade of the inhalation flow that adjustment refrigerant gas are sucked to impeller 1,2 is provided with the suction side of first order impeller 1 (vane)15.The blade 15 is radially configured, each blade 15 centered on the axle center of itself, be mutually in step and only rotation regulation Angle, thus change blade 15 aperture.In order to prevent the vibration of multistage turbocompressor TC(surging), blade 15 Minimum aperture is not 0 °, i.e., completely close blade 15.For example, the minimum aperture of blade 15 is 10 °.The aperture of blade 15 by Control device 20 is controlled.

The discharge side of first order impeller 1 and the suction side of second level impeller 2 are connected by stream 10.In multistage turbine pressure In contracting machine TC, the refrigerant gas of first order impeller 1 are fed to from vaporizer 5, first order pressure is carried out by first order impeller 1 Contracting, then passes through the refrigerant gas that stream 10 is fed to second level impeller 2, and by second level impeller 2 second level compression is carried out, Afterwards, it is sent to condenser 4.

Energy-saving appliance 6 and above-mentioned stream 10 are connected by stream 11, by the detached refrigerant gas of energy-saving appliance 6, are imported into To the multi-stage compression level of multistage turbocompressor TC(It is two-stage in the example)Mid portion(It is the first order and the second level in the example Between part).Liquid level in energy-saving appliance 6 is measured using liquid level meter LV, and its measured value is sent to control device 20.Even DYN dynamic control valve 7 is provided with the stream 11 for meeting energy-saving appliance 6 and multistage turbocompressor TC, the control valve 7 can be to system Refrigerant gas are controlled from energy-saving appliance 6 to the supply and supply stopping of the compression stage of multistage turbocompressor TC.Control valve 7 Being configured to its aperture can adjust, such as using the variable electrodynamic valve of aperture as control valve 7.The aperture of control valve 7 is by controlling Device 20 is controlled.

In the kind of refrigeration cycle of the turborefrigerator for constituting as shown in Figure 1, cold-producing medium is in multistage turbocompressor TC, condensation Circulate in device 4, vaporizer 5 and energy-saving appliance 6, cold water and relative with load is manufactured using the Cooling and Heat Source obtained by vaporizer 5 Should, the heat for carrying out flash-pot 5 that is taken in kind of refrigeration cycle and compress with multistage turbine supply from compressor motor 3 The heat that the work(of machine TC is suitable is released to the cooling water supplied to condenser 4.On the other hand, separated by energy-saving appliance 6 Refrigerant gas be directed to multistage turbocompressor TC multi-stage compression level mid portion, and from first order compressor Simultaneously compressed by high stage compressor 2 at 1 refrigerant gas interflow.Using two stages of compression single-stage economizer cycle, due to being attached with The refrigeration part that energy-saving appliance 6 is realized, therefore partial response ground can increase refrigeration, and is not provided with energy-saving appliance 6 Situation compare, by increasing capacitance it is possible to increase refrigeration.

As shown in figure 1, turborefrigerator possesses:Refrigerant gas are guided from condenser 4 to the hot-gas bypass of vaporizer 5 Stream 25;For being opened and closed the hot gas bypass valve 26 of the hot-gas bypass stream 25.Hot gas bypass valve 26 is configured to its aperture can be adjusted It is whole, for example it is made up of the variable electrodynamic valve of aperture.In common cooling operation, hot gas bypass valve 26 is closed.If opening steam Bypass valve 26, the then refrigerant gas for being compressed by multistage turbocompressor TC are sent without energy-saving appliance 6 but from condenser 4 To vaporizer 5.

Turborefrigerator is also equipped with:The first temperature measuring device of the temperature of the cold water of vaporizer 5 is flowed into as measure Temperature sensor S1;As the temperature sensor S2 of the second temperature determinator of the temperature for determining the cold water flowed out from vaporizer 5; The effusion meter FM that the flow of the cold water to flowing in vaporizer 5 is measured.Temperature sensor S1, S2 and effusion meter FM and control Device processed 20 connects, and the output valve of temperature sensor S1, S2 and effusion meter FM is sent to control device 20.

Control device 20, according to the cold water inlet temperature T1 and cold water outlet temperature that are obtained by temperature sensor S1, S2 The flow of the difference Δ T of T2 and the cold water obtained by effusion meter FM is calculating the current refrigeration capacity of refrigeration machine.More specifically For, current cooling load can be obtained according to the accumulating for flow of temperature difference Δ T and cold water.Or, control device 20 The current refrigeration capacity of refrigeration machine can be calculated according only to cold water inlet temperature T1.In this case, it is also possible to omit flow Meter FM.

The control inverter 14 of control device 20, blade 15, control valve 7 and hot gas bypass valve 26, so that cooling water outlet temperature Degree T2 is maintained the target temperature of regulation.The flow of cold water of vaporizer 5 is being flow through under conditions of constant, turborefrigerator Refrigeration capacity(Cooling load)Depending on cold water inlet temperature T1.That is, if cold water inlet temperature T1 step-downs, need to reduce turbine The refrigeration capacity of refrigeration machine.In recent years, there is the situation that the refrigeration capacity of turborefrigerator is decreased below 20% for requirement.This Bright refrigeration machine, by 4 stage controls of following explanation, can make its refrigeration capacity continuously(I.e. successfully)It is reduced to zero Near.

That is, control device 20 reduces refrigeration capacity by following 4 stages:

(1)The rotary speed control of the multistage turbocompressor TC carried out by inverter 14,

(2)The aperture control of blade 15,

(3)The stopping of the economizer cycle realized by closing control valve 7,

(4)Hot-gas bypass.

In the first rate-determining steps, as the refrigeration capacity for calculating is reduced, control device 20 controls the defeated of inverter 14 Go out frequency and reduce the rotary speed of impeller 1,2.If refrigeration capacity is further reduced and reaches the value of regulation, used as second Rate-determining steps, control device 20 reduces the aperture of blade 15.The aperture of blade 15 reduces with the reduction of refrigeration capacity.

If refrigeration capacity is further reduced and blade 15 is closed to its minimum aperture, as the 3rd rate-determining steps, control Device 20 reduces the aperture of control valve 7.The aperture of control valve 7 reduces with the reduction of refrigeration capacity.If refrigeration capacity enters one Step reduces and controls valve 7 and completely close, then as the 4th rate-determining steps, control device 20 opens hot gas bypass valve 26.It is concrete and Speech, after control valve 7 is completely closed, make the aperture of hot gas bypass valve 26 increases with the reduction of refrigeration capacity.

So, according to the refrigeration capacity obtained by computing, perform in the following sequence:By inverter control(First control Step processed), blade control(Second rate-determining steps), by controlling the control of economizer cycle that valve 7 is carried out(3rd control step Suddenly)And hot gas bypass valve control(4th rate-determining steps), thus enable that the refrigeration capacity of turborefrigerator(Cooling load) It is reduced near 0% from 100%.

Fig. 2 is to represent the control according to above-mentioned 4 stages, and the operation range of turborefrigerator is divided into the situation of four Curve chart.Vibrational line shown in Fig. 2, be if operating head relative to multistage turbocompressor TC inhalation flow it is too high if cause and shake Dynamic line.Therefore turborefrigerator may operate in the operating less than the vibrational line in upper limit line area below.Such as Fig. 2 institutes Show, the operation range of turborefrigerator is divided into four regions:Inverter control region, blade control area, energy-saving appliance are followed Ring control area and hot gas bypass valve control area.Because turborefrigerator so operates according to four rate-determining steps, therefore The refrigeration capacity of turborefrigerator can be made(Refrigerating capacity)Successfully reduce.In particular according to the present invention, hold can refrigeration Amount is successfully(Continuously)It is reduced near 0% from 100%.

Fig. 3 is that the situation for reducing to being made refrigeration capacity by closing control valve 7 in the 3rd rate-determining steps is carried out The mollier diagram of explanation.The refrigeration that control valve 7 is realized when opening by energy-saving appliance 6, is represented with the oblique line portion shown in Fig. 3. If closing control valve 7, the refrigeration realized by energy-saving appliance 6 is disappeared, therefore, it is possible to not reduce to multistage turbocompressor TC suction cold-producing medium inhalation flow and reduce refrigeration capacity, be prevented from significantly decreasing efficiency during low load operation. For example, under the temperature conditionss that cold water inlet temperature T1 is 32 DEG C, cold water outlet temperature T2 is 7 DEG C, by the energy of closing control valve 7 It is enough that refrigeration capacity is reduced into about 15%.The aperture of the control valve 7, can be adjusted in 0~100% scope, therefore the 3rd In rate-determining steps refrigeration capacity can successfully reduced.

As other embodiment, the valve for being only opened and closed action can also be used(I.e., it is impossible to carry out aperture adjustment Valve)As control valve 7.In this case, in the 3rd rate-determining steps, the result of closing control valve 7 is that refrigeration capacity is drastically reduced. In order to avoid the reduction of such refrigeration capacity drastically, preferably in the 3rd rate-determining steps while closing control valve 7, increase The aperture of big blade 15.Now the aperture of blade is the aperture in order to be maintained cold water outlet temperature T2 needed for target temperature, Change depending on operating condition now.The opportunity of open blade 15, it is also possible to while closing with control valve 7, but After firm closing control valve 7.

The aperture of the blade 15 after open blade 15, is controlled according to the current refrigeration capacity obtained by computing System.Afterwards, when refrigeration capacity is further reduced and blade 15 is closed to minimum aperture, above-mentioned 4th control step is next performed Suddenly.That is, as described above, opening hot gas bypass valve 26 according to current refrigeration capacity.

Using present embodiment, by the aperture for increasing blade 15 at once while closing control valve 7 or afterwards, thus Drastically reducing for refrigeration capacity can be avoided, and successfully reduces refrigeration capacity.In addition, can be using only merely flow path 11 The valve of the simple construction being opened and closed is used as control valve 7.Therefore the existing turborefrigerator of the valve of such construction is used Also present embodiment can be suitable for.

As a further embodiment, the valve for being only opened and closed action can also be used(I.e., it is impossible to carry out aperture adjustment Valve)As hot gas bypass valve 26.In this case, in the 4th rate-determining steps, the result for opening hot gas bypass valve 26 is that refrigeration is held Amount is drastically reduced.It is preferably same with above-mentioned embodiment in order to avoid the reduction of such refrigeration capacity drastically, in the 4th control Increase the aperture of blade 15 in step processed at once while hot gas bypass valve 26 are opened or afterwards.The now aperture of blade, be For the aperture being maintained cold water outlet temperature T2 needed for target temperature, change depending on operating condition now.Hereafter, The aperture of blade 15 is controlled according to the current refrigeration capacity obtained by computing.

Present embodiment is illustrated in more detail.In the situation for opening hot gas bypass valve 26 in the 4th rate-determining steps Under, while hot gas bypass valve 26 are opened or afterwards, the aperture of blade 15 is increased at once.The aperture of blade now, is to use In the aperture being maintained cold water outlet temperature T2 needed for target temperature.Hereafter, as refrigeration capacity is reduced, opening for blade 15 is made Degree reduces.

So, by while hot gas bypass valve 26 are opened or afterwards, the aperture of blade 15 being increased at once, thus, it is possible to The reduction drastically of refrigeration capacity is avoided, refrigeration capacity can be made successfully to decline.It additionally is able to using only merely to steam The valve of the simple construction that bypass flow path 25 is opened and closed is used as hot gas bypass valve 26.Therefore, for using such construction The existing turborefrigerator of valve can also be suitable for present embodiment.

Above-mentioned turborefrigerator is the type for possessing inverter, but as shown in figure 4, there is also the class for not possessing inverter The turborefrigerator of type.In the turborefrigerator of the type, by 3 following stage controls, its refrigeration capacity can be made Continuously(I.e. successfully)It is reduced near zero.

(1)The aperture control of blade(First rate-determining steps)

(2)The stopping of the economizer cycle realized by closing control valve 7(Second rate-determining steps)

(3)Hot-gas bypass(3rd rate-determining steps)

Above-mentioned first~the 3rd rate-determining steps, perform identically with the above-mentioned second~the 4th rate-determining steps.Therefore such The turborefrigerator of type can also be such that its refrigeration capacity is continuously reduced near zero.

So far, embodiments of the present invention are illustrated, but the self-evident present invention be not limited to it is above-mentioned Embodiment, but can in a variety of ways implement in the range of its technological thought.

Claims (8)

1. a kind of turborefrigerator, possesses:Vaporizer, it captures heat and cold-producing medium is evaporated so as to play from cooled fluid Refrigeration;Multistage turbocompressor, it passes through multi-stage impeller by refrigerant compression;Condenser, it utilizes cooling fluid to pressure Refrigerant gas after contracting are cooled down so that its condensation;Intercooler that is, energy-saving appliance, it makes condensed refrigerant liquid A part evaporation and the refrigerant gas after evaporation are supplied to the centre of the multi-stage compression level of the multistage turbocompressor Part, the turborefrigerator is characterised by possessing:
Control valve, it is arranged on and connects the energy-saving appliance with the mid portion of the multi-stage compression level of the multistage turbocompressor Stream in, the stream is opened and closed;
Hot-gas bypass stream, it makes the refrigerant gas for being compressed not by the energy-saving appliance but returns from the condenser Return the vaporizer;
Hot gas bypass valve, it is arranged at the hot-gas bypass stream;
Control device, it calculates the system of the turborefrigerator according at least to the temperature of the cold water flowed in the vaporizer Cold capacity,
The multistage turbocompressor possesses:Compressor motor, it rotates the multi-stage impeller;Inverter, it drives described Compressor motor;The variable blade of aperture, it adjusts the inhalation flow of the refrigerant gas to multi-stage impeller suction,
The control device performs in the following sequence the first~the 4th rate-determining steps with the reduction of the refrigeration capacity:
First rate-determining steps, via the inverter rotary speed of the multistage turbocompressor is reduced;
Second rate-determining steps, reduce the aperture of the blade;
3rd rate-determining steps, close the control valve;
4th rate-determining steps, open the hot gas bypass valve,
In the 3rd rate-determining steps, the control device increases at once institute while the control valve is closed or afterwards State the aperture of blade.
2. turborefrigerator as claimed in claim 1, it is characterised in that
The control valve is configured to its aperture can be changed,
In the 3rd rate-determining steps, the control device makes the aperture of the control valve with the reduction of the refrigeration capacity And reduce.
3. turborefrigerator as claimed in claim 1, it is characterised in that
The control valve is configured to its aperture can be changed,
In the 4th rate-determining steps, the control device makes the aperture of the hot gas bypass valve with the refrigeration capacity Reduce and increase.
4. turborefrigerator as claimed in claim 1, it is characterised in that
In the 4th rate-determining steps, the control device increases at once while the hot gas bypass valve is opened or afterwards The aperture of the big blade.
5. a kind of turborefrigerator, possesses:Vaporizer, it captures heat and cold-producing medium is evaporated so as to play from cooled fluid Refrigeration;Multistage turbocompressor, it passes through multi-stage impeller by refrigerant compression;Condenser, it utilizes cooling fluid to pressure Refrigerant gas after contracting are cooled down so that its condensation;Intercooler that is, energy-saving appliance, it makes condensed refrigerant liquid A part evaporation and the refrigerant gas after evaporation are supplied to the centre of the multi-stage compression level of the multistage turbocompressor Part, the turborefrigerator is characterised by possessing:
Control valve, it is arranged on and connects the energy-saving appliance with the mid portion of the multi-stage compression level of the multistage turbocompressor Stream in, the stream is opened and closed;
Hot-gas bypass stream, it makes the refrigerant gas for being compressed not by the energy-saving appliance but returns from the condenser Return the vaporizer;
Hot gas bypass valve, it is arranged at the hot-gas bypass stream;
Control device, it calculates the system of the turborefrigerator according at least to the temperature of the cold water flowed in the vaporizer Cold capacity,
The multistage turbocompressor possesses:Compressor motor, it rotates the multi-stage impeller;The variable blade of aperture, its The inhalation flow of the refrigerant gas to multi-stage impeller suction is adjusted,
The control device performs in the following sequence the first~the 3rd rate-determining steps with the reduction of the refrigeration capacity:
First rate-determining steps, reduce the aperture of the blade;
Second rate-determining steps, close the control valve;
3rd rate-determining steps, open the hot gas bypass valve,
In second rate-determining steps, the control device increases at once institute while the control valve is closed or afterwards State the aperture of blade.
6. turborefrigerator as claimed in claim 5, it is characterised in that
The control valve is configured to its aperture can be changed,
In second rate-determining steps, the control device makes the aperture of the control valve with the reduction of the refrigeration capacity And reduce.
7. turborefrigerator as claimed in claim 5, it is characterised in that
The control valve is configured to its aperture can be changed,
In the 3rd rate-determining steps, the control device makes the aperture of the hot gas bypass valve with the refrigeration capacity Reduce and reduce.
8. turborefrigerator as claimed in claim 5, it is characterised in that
In the 3rd rate-determining steps, the control device increases at once while the hot gas bypass valve is opened or afterwards The aperture of the big blade.
CN201310087471.6A 2012-03-21 2013-03-19 Turbine refrigerator and control method thereof CN103322711B (en)

Priority Applications (2)

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CN108662799A (en) * 2017-03-31 2018-10-16 开利公司 Multistage refrigerating plant and its control method
CN106958957A (en) * 2017-03-31 2017-07-18 丁金虎 The centrifugal frequency-changeable compressor group of three-level and control method
JP2019078429A (en) * 2017-10-20 2019-05-23 三菱重工サーマルシステムズ株式会社 Control device for refrigeration cycle, heat source device and control method for the same
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