CN109855322A - A kind of throttling method and unit of the unit improving heat exchange efficiency - Google Patents
A kind of throttling method and unit of the unit improving heat exchange efficiency Download PDFInfo
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- CN109855322A CN109855322A CN201910130064.6A CN201910130064A CN109855322A CN 109855322 A CN109855322 A CN 109855322A CN 201910130064 A CN201910130064 A CN 201910130064A CN 109855322 A CN109855322 A CN 109855322A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The present invention discloses the throttling method and unit of a kind of unit for improving heat exchange efficiency, unit includes: the major cycle refrigerant flow being arranged between the evaporator of unit and condenser, level-one restricting orifice and two-step throttle orifice plate are provided on major cycle refrigerant flow, the throttling of the liquid refrigerants for realizing the first predetermined amount by level-one restricting orifice and two-step throttle orifice plate；Auxiliary circulating refrigerant flow path between evaporator and condenser is set, is provided with electric expansion valve on auxiliary circulating refrigerant flow path, the throttling of the liquid refrigerants for realizing the second predetermined amount by electric expansion valve.Electric expansion valve can effectively adjust the liquid supply rate of evaporator as a result, ensure that the mass dryness fraction of refrigerant after throttling is smaller, can effectively prevent gas throttling, so that the heat exchange area of evaporator is fully used, improve heat exchange efficiency.Electric expansion valve can also adjust the aperture of itself when anti-surge phenomenon occurs in unit, to widen the range of operation of compressor.
Description
Technical field
The present invention relates to unit fields, in particular to the throttling method and machine of a kind of unit for improving heat exchange efficiency
Group.
Background technique
Currently, the efficiency due to flooded evaporator is higher, Two-stage Compression centrifugal refrigerating machines use full-liquid type mostly
Evaporator.But in two-stage throttling, the difficulty for carrying out throttling control using electric expansion valve is larger can not to be precisely controlled evaporator
Liquid supply rate.Especially when liquid supply rate is very few, will lead to the effective heat exchange area reduction of evaporator, and lead to low-voltage variation etc.
Problem.To solve this problem, use orifice plate as throttling set mostly in the related technology, but the aperture of orifice plate be it is fixed,
Cause the performance for adjusting flow poor, so that the effective heat exchange area of evaporator cannot be fully utilized, heat exchange efficiency is lower.
For in the related technology, two-stage throttling is carried out using orifice plate prevent the effective heat exchange area of evaporator is from obtaining merely
To making full use of, the lower problem of heat exchange efficiency, currently no effective solution has been proposed.
Summary of the invention
To solve in the related technology, it is simple two-stage throttling carried out using orifice plate prevent evaporator effective heat exchange area from
It is fully used, heat exchange efficiency lower problem provides a kind of section of unit for improving heat exchange efficiency in the embodiment of the present invention
Stream method and unit.
In a first aspect, the embodiment of the present invention provides a kind of unit, the unit includes: the evaporator that the unit is arranged in
Major cycle refrigerant flow between condenser is provided with level-one restricting orifice and two-step throttle on the major cycle refrigerant flow
Orifice plate, the section of the liquid refrigerants for realizing the first predetermined amount by the level-one restricting orifice and the two-step throttle orifice plate
Stream；
Auxiliary circulating refrigerant flow path between the evaporator and the condenser is set, on the auxiliary circulating refrigerant flow path
It is provided with electric expansion valve, the throttling of the liquid refrigerants for realizing the second predetermined amount by the electric expansion valve；
Wherein, the liquid refrigerants is flowed out from the condenser, and the total amount of the liquid refrigerants is the first predetermined amount and the
The sum of two predetermined amounts.
Further, the unit further include: flash evaporation,
The flash evaporation, between the level-one restricting orifice and the two-step throttle orifice plate, the top of the flash evaporation
Portion channel is connect with the gas supplementing opening of the compressor of the unit, for generating flash gas and being delivered to the compressor；
The compressor is connected between the evaporator and the condenser, for absorbing from the evaporator
Low-pressure gaseous refrigerant is mixed with the flash gas of sucking, will be mixed after the low-pressure gaseous refrigerant is carried out one stage of compression
After refrigerant carries out two-stage compression, it is discharged into the condenser；
The condenser, it is cold to form the liquid for being condensed to the mixing refrigerant after the two-stage compression
Matchmaker.
Further, the unit further include:
Liquid inductance thermometer bulb out is arranged on the export pipeline of the condenser, for determining the reality at the condensator outlet
Border goes out liquid temperature；
Pressure sensor is arranged on the export pipeline of the condenser, for detecting condensing pressure；
The electric expansion valve, for going out liquid temperature according to the reality and the condensing pressure determines liquid degree of supercooling,
The amplitude of itself is adjusted according to the liquid degree of supercooling out.
Further, the liquid degree of supercooling out can be determined by following formula:
T1=T2-T3, T1 are the liquid degree of supercooling out, and T2 is condensation temperature corresponding with the condensing pressure, and T3 is institute
State practical liquid temperature out.
Further, the unit further include: current sensor is arranged in the compressor of the unit, for detecting
Flow through the electric current of the compressor；
The electric expansion valve, for determining whether the compressor is in surge shape according to the fluctuation situation of the electric current
State, if it is, adjusting the amplitude of itself by preset strategy；If it is not, then pressing out the amplitude that liquid degree of supercooling adjusts itself.
Further, the unit is bipolar compression centrifugal refrigerating machines, and the evaporator is flooded evaporator.
Second aspect, the embodiment of the present invention provide a kind of throttling method of unit, and the method is applied to first aspect institute
In the unit stated, which comprises
Whether the compressor for monitoring the unit is in surging condition；
In the case where monitoring that the compressor of the unit is not at the surging condition, that detects the unit goes out liquid
Degree of supercooling；
The amplitude of electric expansion valve is adjusted according to the liquid degree of supercooling out；
Wherein, the electric expansion valve is arranged on auxiliary circulating refrigerant flow path, and the auxiliary circulating refrigerant flow path is connected to institute
It states between the evaporator of unit and the condenser of the unit.
Further, it is determined that the compressor of the unit whether in surging condition include:
Detection flows through the electric current of the compressor；
In the electric current, the difference of the current maxima and current minimum in each cycle period is determined, and determine
Current average in each cycle period；Wherein, the difference is positive value；
The current fluctuation situation in each cycle period is determined according to the difference and the current average；
Determine whether the compressor is in the surging condition according to the current fluctuation situation.
Further, the current fluctuation situation in each cycle period is determined according to the difference and the current average
Include:
Judge whether the difference is greater than the preset percentage of the current average；
If it is, determining that electric current fluctuates.
Further, after determining that fluctuation occurs in electric current, the method also includes:
Current fluctuation number is increased primary.
Further, determine whether the compressor is in the surging condition and includes: according to the current fluctuation situation
In continuous N number of cycle period, current fluctuation number is N-1 times, it is determined that the compressor is in surging condition；
In continuous S cycle period, current fluctuation number is zero, it is determined that the compressor is not at surging condition；
Wherein, the N and S is preset quantity, and the S is greater than or equal to N.
Further, whether the compressor for monitoring the unit is in after surging condition, the method also includes:
When the compressor for monitoring the unit is in surging condition, controls the electric expansion valve and recycled every one
Itself amplitude is increased G% by the period；
Wherein, G% is predetermined amplitude value.
Further, pass through following formula according to the amplitude that the liquid degree of supercooling out adjusts electric expansion valve to realize:
K=a (T1-T0)+b (P1-P2)；
Wherein, K is the amplitude, and a is degree of supercooling drift correction coefficient, T1 is the liquid degree of supercooling out, and T0 is default mesh
Degree of supercooling is marked, b is degree of supercooling change rate correction factor, and P1 is the degree of supercooling deviation in the previous cycle period, and P2 is upper one
Degree of supercooling deviation in the adjacent circulation period, degree of supercooling deviation=T1-T0 in the previous cycle period.
Further, include: according to the amplitude that the liquid degree of supercooling out adjusts electric expansion valve
It controls the amplitude and adjusts K% every a cycle period；
Wherein, when K is greater than 0, the aperture of the electric expansion valve increases, when K is less than 0, the electric expansion valve
Aperture reduces, and as K=0, the aperture that the electric expansion valve keeps current is constant, and the K is less than or equal to amplitude threshold.
It applies the technical scheme of the present invention, unit includes: the major cycle being arranged between the evaporator of unit and condenser
Refrigerant flow is provided with level-one restricting orifice and two-step throttle orifice plate on major cycle refrigerant flow, for passing through level-one throttle orifice
Plate and two-step throttle orifice plate realize the throttling of the liquid refrigerants of the first predetermined amount；Be arranged between evaporator and condenser auxiliary follows
Ring refrigerant flow is provided with electric expansion valve on auxiliary circulating refrigerant flow path, for passing through electric expansion valve the second predetermined amount of realization
Liquid refrigerants throttling；Wherein, liquid refrigerants is flowed out from condenser, and the total amount of liquid refrigerants is that the first predetermined amount and second are pre-
If the sum of amount.Electric expansion valve can effectively adjust the liquid supply rate of evaporator as a result, ensure that throttling after refrigerant mass dryness fraction compared with
It is small, it can be effectively prevent gas throttling, so that the heat exchange area of evaporator is fully used, improve heat exchange efficiency.Electronics is swollen
Swollen valve can also adjust the aperture of itself, can widen the range of operation of compressor when anti-surge phenomenon occurs in unit.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram of unit for improving heat exchange efficiency according to an embodiment of the present invention；
Fig. 2 is a kind of flow chart of the throttling method of unit for improving heat exchange efficiency according to an embodiment of the present invention；
Fig. 3 is a kind of flow chart of the throttling method of unit for improving heat exchange efficiency according to an embodiment of the present invention；
Fig. 4 is a kind of flow chart of the throttling method of unit for improving heat exchange efficiency according to an embodiment of the present invention；
Fig. 5 is a kind of flow chart of the throttling method of unit for improving heat exchange efficiency according to an embodiment of the present invention；
Fig. 6 is a kind of flow chart of the throttling method of unit for improving heat exchange efficiency according to an embodiment of the present invention.
Specific embodiment
Present invention is further described in detail in the following with reference to the drawings and specific embodiments, it should be understood that described herein
Specific embodiment be only used to explain the present invention, be not intended to limit the present invention.
In subsequent description, it is only using the suffix for indicating such as " module ", " component " or " unit " of element
Be conducive to explanation of the invention, itself there is no a specific meaning.Therefore, " module ", " component " or " unit " can mix
Ground uses.
In order to solve to carry out two-stage throttling using orifice plate merely prevent the effective heat exchange area of evaporator is from obtaining sufficiently
It utilizes, the lower problem of heat exchange efficiency, the embodiment of the present invention provides a kind of unit for improving heat exchange efficiency, as shown in Figure 1, unit
Include:
Major cycle refrigerant flow between the evaporator 3 of unit and condenser 1 is set, is arranged on major cycle refrigerant flow
There are level-one restricting orifice 6 and two-step throttle orifice plate 4, for realizing that first is pre- by level-one restricting orifice 6 and two-step throttle orifice plate 4
If the throttling of the liquid refrigerants of amount；
Auxiliary circulating refrigerant flow path between evaporator 3 and condenser 1 is set, is provided with electronics on auxiliary circulating refrigerant flow path
Expansion valve 8, the throttling of the liquid refrigerants for realizing the second predetermined amount by electric expansion valve 8；
Wherein, liquid refrigerants is flowed out from condenser 1, the total amount of liquid refrigerants be the first predetermined amount and the second predetermined amount it
With.
Wherein, unit can be bipolar compression centrifugal refrigerating machines, and evaporator 3 is flooded evaporator 3.Major cycle is cold
The cold medium flux of matchmaker's flow path and auxiliary circulating refrigerant flow path can according to the composite factors such as the declared working condition of unit and range of operation press than
Example is designed, and is verified by many experiments, it is generally the case that the circular flow of auxiliary circulation stream refrigerant accounts for total flow
Ratio is no more than 30%.
Electric expansion valve 8 can effectively adjust the liquid supply rate of evaporator 3 as a result, ensure that throttling after refrigerant mass dryness fraction compared with
It is small, it can be effectively prevent gas throttling, so that the heat exchange area of evaporator 3 is fully used, improve heat exchange efficiency.Electronics is swollen
Swollen valve 8 can also adjust the aperture of itself, can widen the range of operation of compressor 2 when anti-surge phenomenon occurs in unit.
In one possible implementation, as shown in Figure 1, unit further include: flash evaporation 5 is located at level-one restricting orifice 6
Between two-step throttle orifice plate 4, the gas supplementing opening of the compressor 2 of the top passageway and unit of flash evaporation 5 is connected, for generating shwoot
Gas is simultaneously delivered to compressor 2；Compressor 2 is connected between evaporator 3 and condenser 1, carrys out flash-pot 3 for absorbing
Low-pressure gaseous refrigerant mixes after low-pressure gaseous refrigerant is carried out one stage of compression with the flash gas of sucking, and mixing refrigerant is carried out
After two-stage compression, it is discharged into condenser 1；Condenser 1, for being condensed to the mixing refrigerant after two-stage compression, to form liquid
State refrigerant.
In one possible implementation, unit further include: go out liquid inductance thermometer bulb 7, the export pipeline of condenser 1 is set
On, for determining that the reality in 1 exit of condenser goes out liquid temperature；Pressure sensor is arranged on the export pipeline of condenser 1,
For detecting condensing pressure；Electric expansion valve 8, for determining liquid degree of supercooling, root according to practical liquid temperature and condensing pressure out
The amplitude of itself is adjusted according to liquid degree of supercooling out.In one possible implementation, liquid degree of supercooling can be determined by following formula out:
T1=T2-T3, T1 are liquid degree of supercooling, and T2 is condensation temperature corresponding with condensing pressure, and T3 is that reality goes out liquid temperature.
In one possible implementation, unit further include: current sensor is arranged in the compressor 2 of unit, uses
The electric current of compressor 2 is flowed through in detection；Electric expansion valve 8, for determining whether compressor is according to the fluctuation situation of electric current
Surging condition, if it is, adjusting the amplitude of itself by preset strategy；If it is not, then pressing out the width that liquid degree of supercooling adjusts itself
Degree.
It will be appreciated that set structure shown in FIG. 1 is two-stage throttling second vapor injection increasing enthalpy refrigeration cycle structure.Compressor
The 2 inhalable low-pressure steams from flooded evaporator 3, and the flash evaporation after one stage impeller compresses and in flash evaporation 5
Mixing, after compressing using sencond stage impeller, is discharged into condenser 1 and is condensed into liquid refrigerants.Throttle part divides main road and bypass, main
Refrigerant in road enters flash evaporation after the throttling of level-one orifice plate 6, and flash gas is inhaled into compressor 2 at the top of flash evaporation 5
Sencond stage impeller before, liquid refrigerants by second level orifice plate 4 throttling after enter 3 evaporation endothermic of flooded evaporator；Bypass uses electricity
Liquid supply rate of the sub- expansion valve 8 as throttle mechanism control evaporator 3.It will be appreciated that the arrow in Fig. 1 is refrigerant flow direction.
In the present embodiment, unit can be the centrifugal refrigerating machines for using flooded evaporator 3, wherein major cycle stream
Road is throttled using two-stage orifice plate (4 and 6), and bypass is throttled using electric expansion valve 8, and the aperture of the electric expansion valve 8 of bypass can root
It is controlled according to the anti-surge for going out liquid degree of supercooling and centrifugal compressor 2 of condenser 1.Specific Jie can be below specific control method
It continues.Simple asking using the performance difference of adjusting refrigerant circulation flow caused by two-stage restricting orifice is not only solved as a result,
Topic is also solved and is asked in the related technology since the range of operation of compressor caused by the anti-surge of centrifugal compressor is relatively narrow
Topic, so that the reliability and service life of unit can be improved.
Fig. 2 shows a kind of throttling method of unit according to an embodiment of the present invention, method can be applied to machine shown in FIG. 1
In group, method includes:
Step S201, whether the compressor for monitoring unit is in surging condition；
Step S202, in the case where monitoring that the compressor of unit is not at surging condition, that detects unit goes out liquid mistake
Cold degree；
Step S203, according to the amplitude for going out liquid degree of supercooling adjusting electric expansion valve；
Wherein, electric expansion valve is arranged on auxiliary circulating refrigerant flow path, and auxiliary circulating refrigerant flow path is connected to the evaporation of unit
Between device and the condenser of unit.
In one possible implementation, following formula is passed through according to the amplitude that liquid degree of supercooling out adjusts electric expansion valve
It realizes: K=a (T1-T0)+b (P1-P2)；
Wherein, K is amplitude, and a is degree of supercooling drift correction coefficient, T1 is liquid degree of supercooling, and T0 is goal-selling degree of supercooling,
B is degree of supercooling change rate correction factor, and P1 is the degree of supercooling deviation in the previous cycle period, and P2 was a upper adjacent circulation week
Degree of supercooling deviation in phase, degree of supercooling deviation=T1-T0 in the previous cycle period.
As shown in figure 3, step S203, according to go out liquid degree of supercooling adjust electric expansion valve amplitude include: step S2031,
Span of control limit of control adjusts K% every a cycle period；Wherein, when K is greater than 0, the aperture of electric expansion valve increases, when K is less than 0
When, the aperture of electric expansion valve reduces, and as K=0, the aperture that electric expansion valve keeps current is constant, and K is less than or equal to amplitude
Threshold value.It will be appreciated that P2 is a upper adjacent circulation due to the degree of supercooling deviation that P1 is in the previous cycle period in formula
Degree of supercooling deviation in period, then the amplitude of electric expansion valve is to adjust K% every cycle period, rather than each circulation
Period is adjusted.
Electric expansion valve is more flexible to the adjusting of cold medium flux, and the variation that can be exported according to compressor capacity (can be with cold
Condenser goes out liquid degree of supercooling to indicate) automatic adjustment aperture, to be always ensured that before throttling that there are certain degree of supercooling, guarantee throttlings
The mass dryness fraction of refrigerant is smaller afterwards, prevents gas throttling, effectively to adjust the liquid supply rate of evaporator, to can guarantee evaporator
Heat exchange area is fully used.
In one possible implementation, as shown in figure 4, step S201, determining whether the compressor of unit is in asthma
Vibration state includes:
Step S2011, detection flows through the electric current of compressor；
Step S2012, in electric current, the difference of the current maxima and current minimum in each cycle period is determined,
And determine the current average in each cycle period；
Wherein, difference is positive value；
Step S2013, the current fluctuation situation in each cycle period is determined according to difference and current average；
Step S2014, determine whether compressor is in surging condition according to current fluctuation situation.
In one possible implementation, the current wave in each cycle period is determined according to difference and current average
Emotionally condition includes: to judge whether difference is greater than the preset percentage of current average；If it is, determining that electric current fluctuates.
After determining that fluctuation occurs in electric current, method further include: increase current fluctuation number primary.
In one possible implementation, as shown in figure 5, step S2014, according to current fluctuation situation determining compressor
Whether in surging condition include:
Step S20141, in continuous N number of cycle period, current fluctuation number is N-1 times, it is determined that compressor is in asthma
Vibration state；
Step S20142, in continuous S cycle period, current fluctuation number is zero, it is determined that compressor is not at asthma
Vibration state；Wherein, N and S is preset quantity, and S is greater than or equal to N.
In one possible implementation, as shown in fig. 6, whether the compressor in step S201, monitoring unit is in
After surging condition, method further include:
Step S601, when the compressor for monitoring unit is in surging condition, control electric expansion valve is followed every one
Itself amplitude is increased G% by the ring period；Wherein, G% is predetermined amplitude value.
In a specific application scenarios, electric expansion valve by prevent anti-surge carry out aperture regulation when, can be used as
Under type: calculating in each cycle period, the maximum value and minimum value of compressor current, in each cycle period, compressor
(15% is in above-mentioned implementation when the maximum value of electric current and the difference of minimum value are more than 15% of average current in the period
Preset percentage, or other values can be determined according to the model of unit, application scenarios etc.), then compressor current
Fluctuate time number scale 1 time, when continuous three cycle compression machines current fluctuation twice, then it is assumed that centrifugal compressor is in surging condition.
Electric expansion valve is adjusted by the amplitude for opening big G% at interval of a cycle period at this time；G% is predetermined amplitude, when continuous
It detects that compressor current does not fluctuate in six periods, then illustrates that then electric expansion valve is by upper at this time without anti-surge phenomenon
It states and is controlled described in possible implementation according to liquid degree of supercooling out.
Wherein, detected in continuous six periods compressor current do not occur fluctuating avoidable measurement period it is too short caused by
Measurement error also can avoid the erroneous judgement situation caused by current fluctuation, judge anti-surge more accurate.
It will be appreciated that centrifugal compressor, in the slow-speed of revolution, inspiratory flow is small, the effective head that centrifugal impeller provides subtracts
It is small, so that pressure at expulsion can not overcome condensing pressure, centrifugal compressor is caused to be unable to normal exhaust and surge phenomenon occurs.By
This, the minimum speed of centrifugal compressor will receive certain limitation, cause energy-conditioning range small.It is mentioned using the embodiment of the present invention
The technical solution of confession, when surge occurs for centrifugal compressor, electric expansion valve can tune up aperture, to reduce condensing pressure, protect
The pressure head that card compressor provides can overcome condensing pressure, so that the revolving speed of centrifugal compressor is further decreased, by compressor
Energy-conditioning range is widened.That is, preventing the generation of surge phenomenon using pressure release effect, guarantee compressor at low turn
Speed operation reliable and stable down, to widen the range of operation of centrifugal compressor.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in a storage medium
In (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a mobile terminal (can be mobile phone, computer, clothes
Business device, air conditioner or the network equipment etc.) execute method described in each embodiment of the present invention.
The embodiment of the present invention is described above in conjunction with figure, but the invention is not limited to above-mentioned specific realities
Mode is applied, the above mentioned embodiment is only schematical, rather than restrictive, and those skilled in the art exist
Under enlightenment of the invention, without breaking away from the scope protected by the purposes and claims of the present invention, many shapes can be also made
Formula, all of these belong to the protection of the present invention.
Claims (16)
1. a kind of unit, which is characterized in that the unit includes:
Major cycle refrigerant flow between the evaporator and condenser of the unit is set, is set on the major cycle refrigerant flow
It is equipped with level-one restricting orifice and two-step throttle orifice plate, for realizing by the level-one restricting orifice and the two-step throttle orifice plate
The throttling of the liquid refrigerants of first predetermined amount；
Auxiliary circulating refrigerant flow path between the evaporator and the condenser is set, is arranged on the auxiliary circulating refrigerant flow path
There is electric expansion valve, the throttling of the liquid refrigerants for realizing the second predetermined amount by the electric expansion valve；
Wherein, the liquid refrigerants is flowed out from the condenser, and the total amount of the liquid refrigerants is that the first predetermined amount and second are pre-
If the sum of amount.
2. unit according to claim 1, which is characterized in that the unit further include: flash evaporation,
The flash evaporation, between the level-one restricting orifice and the two-step throttle orifice plate, the top of the flash evaporation is logical
Road is connect with the gas supplementing opening of the compressor of the unit, for generating flash gas and being delivered to the compressor；
The compressor is connected between the evaporator and the condenser, for absorbing the low pressure from the evaporator
Gaseous coolant mixes with the flash gas of sucking after the low-pressure gaseous refrigerant is carried out one stage of compression, will mix refrigerant
After carrying out two-stage compression, it is discharged into the condenser；
The condenser, for being condensed to the mixing refrigerant after the two-stage compression, to form the liquid refrigerants.
3. unit according to claim 1, which is characterized in that the unit further include:
Liquid inductance thermometer bulb out is arranged on the export pipeline of the condenser, for determining that the reality at the condensator outlet goes out
Liquid temperature；
Pressure sensor is arranged on the export pipeline of the condenser, for detecting condensing pressure；
The electric expansion valve, for going out liquid temperature according to the reality and the condensing pressure determines liquid degree of supercooling, according to
The liquid degree of supercooling out adjusts the amplitude of itself.
4. unit according to claim 3, which is characterized in that
The liquid degree of supercooling out can be determined by following formula:
T1=T2-T3, T1 are the liquid degree of supercooling out, and T2 is condensation temperature corresponding with the condensing pressure, and T3 is the reality
Border goes out liquid temperature.
5. unit according to claim 1, which is characterized in that the unit further include: current sensor is arranged described
In the compressor of unit, for detecting the electric current for flowing through the compressor；
The electric expansion valve, for determining whether the compressor is in surging condition according to the fluctuation situation of the electric current,
If it is, adjusting the amplitude of itself by preset strategy；If it is not, then pressing out the amplitude that liquid degree of supercooling adjusts itself.
6. unit described in any one of -5 according to claim 1, which is characterized in that
The unit is bipolar compression centrifugal refrigerating machines, and the evaporator is flooded evaporator.
7. a kind of throttling method of unit, which is characterized in that the method is applied to machine described in any one of power 1 to power 6
In group, which comprises
Whether the compressor for monitoring the unit is in surging condition；
In the case where monitoring that the compressor of the unit is not at the surging condition, that detects the unit goes out liquid supercooling
Degree；
The amplitude of electric expansion valve is adjusted according to the liquid degree of supercooling out；
Wherein, the electric expansion valve is arranged on auxiliary circulating refrigerant flow path, and the auxiliary circulating refrigerant flow path is connected to the machine
Between the evaporator of group and the condenser of the unit.
8. the method according to the description of claim 7 is characterized in that determining whether the compressor of the unit is in surging condition
Include:
Detection flows through the electric current of the compressor；
In the electric current, the difference of the current maxima and current minimum in each cycle period is determined, and determine each
Current average in cycle period；Wherein, the difference is positive value；
The current fluctuation situation in each cycle period is determined according to the difference and the current average；
Determine whether the compressor is in the surging condition according to the current fluctuation situation.
9. according to the method described in claim 8, it is characterized in that, being determined according to the difference and the current average each
Current fluctuation situation in cycle period includes:
Judge whether the difference is greater than the preset percentage of the current average；
If it is, determining that electric current fluctuates.
10. according to the method described in claim 9, it is characterized in that, the method is also wrapped after determining that fluctuation occurs in electric current
It includes:
Current fluctuation number is increased primary.
11. according to the method described in claim 10, it is characterized in that, determining the compressor according to the current fluctuation situation
Whether being in the surging condition includes:
In continuous N number of cycle period, current fluctuation number is N-1 times, it is determined that the compressor is in surging condition；
In continuous S cycle period, current fluctuation number is zero, it is determined that the compressor is not at surging condition；
Wherein, the N and S is preset quantity, and the S is greater than or equal to N.
12. the method according to the description of claim 7 is characterized in that whether the compressor for monitoring the unit is in surge shape
After state, the method also includes:
When the compressor for monitoring the unit is in surging condition, the electric expansion valve is controlled every a circulating cycle
Itself amplitude is increased G% by the phase；
Wherein, G% is predetermined amplitude value.
13. the method according to the description of claim 7 is characterized in that adjusting electric expansion valve according to the liquid degree of supercooling out
Amplitude is realized by following formula:
K=a (T1-T0)+b (P1-P2)；
Wherein, K is the amplitude, and a is degree of supercooling drift correction coefficient, T1 is the liquid degree of supercooling out, and T0 is goal-selling mistake
Cold degree, b are degree of supercooling change rate correction factor, and P1 is the degree of supercooling deviation in the previous cycle period, and P2 is upper one adjacent
Degree of supercooling deviation in cycle period, degree of supercooling deviation=T1-T0 in the previous cycle period.
14. according to the method for claim 13, which is characterized in that adjust electric expansion valve according to the liquid degree of supercooling out
Amplitude includes:
It controls the amplitude and adjusts K% every a cycle period；
Wherein, when K is greater than 0, the aperture of the electric expansion valve increases, when K is less than 0, the aperture of the electric expansion valve
Reduce, as K=0, the aperture that the electric expansion valve keeps current is constant, and the K is less than or equal to amplitude threshold.
15. a kind of computer equipment including memory, processor and stores the meter that can be run on a memory and on a processor
Calculation machine program, which is characterized in that the processor is realized as described in any one of claim 7 to 14 when executing described program
Method.
16. a kind of storage medium comprising computer executable instructions, the computer executable instructions are by computer disposal
For executing the method as described in any one of claim 7 to 14 when device executes.
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