CN110440411A - Improve the refrigerant traffic organising method, apparatus and unit of unit reliability - Google Patents
Improve the refrigerant traffic organising method, apparatus and unit of unit reliability Download PDFInfo
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- CN110440411A CN110440411A CN201910731583.8A CN201910731583A CN110440411A CN 110440411 A CN110440411 A CN 110440411A CN 201910731583 A CN201910731583 A CN 201910731583A CN 110440411 A CN110440411 A CN 110440411A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- Chemical & Material Sciences (AREA)
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- Mathematical Physics (AREA)
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- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The present invention discloses a kind of refrigerant traffic organising method, apparatus and unit for improving unit reliability.Wherein, this method comprises: the return water temperature value of the supply water temperature value of detection evaporator and evaporator；According to the supply water temperature value, the return water temperature value and fiducial temperature value, the flow direction of the refrigerant of compressor discharge is controlled.Through the invention, the supply backwater temperature difference of air-cooled screw unit, improving air-cooled screw unit reliability can guarantee when package bursting by freezing does not occur while air-cooled screw unit water-supply shortages, provides cooling capacity to the maximum extent.
Description
Technical field
The present invention relates to machine set technology fields, in particular to a kind of refrigerant traffic organising for improving unit reliability
Method, apparatus and unit.
Background technique
Air-cooled screw unit is now widely used in the places such as office, megastore, hospital.Firstly because pacifying outside unit room
Dress, engineering water system are exposed to outdoor mostly, engineering water system are caused to be likely to occur impurity, influence engineering water flow direction；Secondly by
In equipment management reason, it is equally possible to occur engineering water supply flow to it is relatively low, far below the specified water flow of unit to the case where.
When encountering these situations, unit is run also according to original state, causes the first difference of evaporator big, gently then machine
The too low failure of group low pressure is shut down, and even will appear the serious consequences such as package bursting by freezing when serious.
When flowing to insufficient for engineering water in the prior art, the supply backwater temperature difference value of evaporator is excessive, and event easily occurs in equipment
The problem of barrier, currently no effective solution has been proposed.
Summary of the invention
A kind of refrigerant traffic organising method, apparatus and unit improving unit reliability is provided in the embodiment of the present invention, with
The problem of when solving engineering water underfed in the prior art, the supply backwater temperature difference value of evaporator is excessive, leads to unit failure.
In order to solve the above technical problems, the present invention provides it is a kind of improve unit reliability refrigerant traffic organising method and
Device, wherein this method comprises:
Detect the supply water temperature value of evaporator and the return water temperature value of evaporator；
According to the supply water temperature value, the return water temperature value and fiducial temperature value, the refrigerant of compressor discharge is controlled
Flow direction.
Further, the supply water temperature value of evaporator and the return water temperature value of evaporator are detected, comprising:
The supply water temperature value of evaporator is detected by the first temperature sensor；
The return water temperature value of evaporator is detected by second temperature sensor；
Wherein, the outlet of the evaporator, the second temperature sensor setting is arranged in first temperature sensor
In the entrance of the evaporator.
Further, according to the supply water temperature value, the return water temperature value and fiducial temperature value, compressor discharge is controlled
Refrigerant flow direction, comprising:
It is poor to be made according to the supply water temperature value and the return water temperature value, obtains the first difference；
The difference for calculating first difference Yu the fiducial temperature value, obtains the second difference,
The first valve opening is controlled according to second difference or is remained turned-off, to control the refrigerant stream of compressor discharge
Enter bypass line or condenser；
Wherein, the bypass line is arranged between compressor air-discharging pipeline and evaporator pipeline, first valve
Door is arranged on bypass line.
Further, the first valve opening is controlled according to second difference or remained turned-off, comprising:
If second the first preset threshold of difference <, the first valve of control is remained turned-off；
If the second difference >=the first preset threshold, the first valve opening is controlled.
Further, after controlling the first valve opening, the method also includes:
Current supply water temperature value and return water temperature value are detected, with the second difference described in real-time update；
According to second difference, the aperture of the second valve is adjusted, to adjust the refrigerant flow rate in the bypass line；
Wherein, second valve is arranged on the bypass line.
Further, according to second difference, the aperture of the second valve is adjusted, comprising:
If second difference >=the first preset threshold, second valve opening is adjusted to initial set value；Its
In, the initial set value is definite value；
If second the first preset threshold of difference <, increases opening for second valve described in the second preset threshold <
Degree；
If third predetermined threshold value≤second difference≤second preset threshold, keeps second valve currently to open
Degree；
If the second difference < third predetermined threshold value described in the 4th preset threshold <, reduces opening for second valve
Degree；
Wherein, first pre- described in the second preset threshold < described in third predetermined threshold value < described in the 4th preset threshold <
If threshold value.
Further, the method also includes:
When the second difference≤four preset threshold, controls first valve and close.
Further, the method also includes:
If second difference >=first preset threshold, sounds an alarm.
The present invention also provides a kind of refrigerant flow control devices for improving unit reliability, wherein the device includes:
The outlet of the evaporator is arranged in first temperature sensor, for detecting the supply water temperature value of evaporator；
The entrance of the evaporator is arranged in second temperature sensor, for detecting the return water temperature value of evaporator；
The controller, for according to the supply water temperature value, the return water temperature value and fiducial temperature value, control first
Valve is closed and is opened.
First valve is arranged on bypass line, for making refrigerant flow to bypass line when opening, is closing
When make refrigerant flow to condenser；
Bypass line is arranged between compressor air-discharging pipeline and evaporator pipeline, for what compressor was discharged
Refrigerant imports evaporator pipeline.
Further, the controller is also used to according to the supply water temperature value and the return water
It is poor that temperature value is made, and obtains the first difference；Calculate first difference and the fiducial temperature
The difference of value obtains the second difference, controls first valve according to second difference and opens
It opens or remains turned-off.
Further, the controller is also used to after controlling first valve opening, and second is poor described in real-time update
Value, to adjust the aperture of the second valve.
Second valve is arranged on the bypass line, for adjusting the refrigerant flow rate in the bypass line.
Further, described device further include:
Pressure maintains element, and the compressor air-discharging pipeline, the input end of condenser and the bypass line is arranged in
Junction, for keeping the import end pressure of condenser.
Further, described device further include:
Alarm unit connects the controller, for being sounded an alarm according to second difference.
The present invention also provides a kind of air-cooled screw units, including above-mentioned refrigerant flow control device.
It applies the technical scheme of the present invention, in air-cooled screw unit when engineering water underfed, by detecting evaporator
Supply water temperature value and evaporator return water temperature value, according to the supply water temperature value, the return water temperature value and fiducial temperature
The flow direction of value, the refrigerant of control compressor discharge controls bypass pipe when evaporator supply water temperature and excessive return water temperature difference
Road conducting mixes with the low temperature refrigerant after throttling by the coolant distribution of compressor discharge to bypass line, is lifted into evaporator
Refrigerant temperature, reduce air-cooled screw unit supply backwater temperature difference, improve air-cooled screw unit reliability, can guarantee package not
In the case of there is bursting by freezing, cooling capacity is provided to the maximum extent.
Detailed description of the invention
Fig. 1 is the flow chart of refrigerant traffic organising method according to an embodiment of the present invention；
Fig. 2 is the structural block diagram of refrigerant flow control device according to an embodiment of the present invention；
Fig. 3 is the structural block diagram of refrigerant flow control device according to an embodiment of the present invention；
Fig. 4 is the structural block diagram of refrigerant flow control device according to an embodiment of the present invention；
Fig. 5 is refrigerant traffic organising schematic diagram according to an embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
The term used in embodiments of the present invention is only to be not intended to be limiting merely for for the purpose of describing particular embodiments
The present invention.In the embodiment of the present invention and the "an" of singular used in the attached claims, " described " and "the"
It is also intended to including most forms, unless the context clearly indicates other meaning, " a variety of " generally comprise at least two.
It should be appreciated that term "and/or" used herein is only a kind of incidence relation for describing affiliated partner, indicate
There may be three kinds of relationships, for example, A and/or B, can indicate: individualism A, exist simultaneously A and B, individualism B these three
Situation.In addition, character "/" herein, typicallys represent the relationship that forward-backward correlation object is a kind of "or".
It will be appreciated that though temperature sensor may be described using term first, second etc. in embodiments of the present invention,
But these temperature sensors should not necessarily be limited by these terms.These terms are only used to distinguish different temperature sensors.For example,
In the case where not departing from range of embodiment of the invention, the first temperature sensor can also be referred to as second temperature sensor, class
As, second temperature sensor can also be referred to as the first temperature sensor.
Depending on context, word as used in this " if ", " if " can be construed to " ... when " or
" when ... " or " in response to determination " or " in response to detection ".Similarly, context is depended on, phrase " if it is determined that " or " such as
Fruit detection (condition or event of statement) " can be construed to " when determining " or " in response to determination " or " when detection (statement
Condition or event) when " or " in response to detection (condition or event of statement) ".
It should also be noted that, the terms "include", "comprise" or its any other variant are intended to nonexcludability
Include, so that commodity or device including a series of elements not only include those elements, but also including not clear
The other element listed, or further include for this commodity or the intrinsic element of device.In the feelings not limited more
Under condition, the element that is limited by sentence "including a ...", it is not excluded that in the commodity or device for including the element also
There are other identical elements.
The alternative embodiment that the invention will now be described in detail with reference to the accompanying drawings.
Embodiment 1
Fig. 1 is the flow chart of refrigerant traffic organising method according to an embodiment of the present invention, as shown in Figure 1, this method comprises:
Step S101 detects the supply water temperature value of evaporator and the return water temperature value of evaporator；
Step S102 controls compressor discharge according to the supply water temperature value, the return water temperature value and fiducial temperature value
Refrigerant flow direction；
Wherein, fiducial temperature value is definite value, can be related according to the self-characteristic or the art of air-cooled screw unit
Standard determine, those skilled in the art can its specific value determines according to actual conditions, in the present invention, to fiducial temperature value
It is not especially limited.
By detecting the supply water temperature value of evaporator and the return water temperature value of evaporator, according to the supply water temperature value, institute
Return water temperature value and fiducial temperature value, the flow direction of the refrigerant of control compressor discharge are stated, and then controls the range of supply backwater temperature difference,
Improve air-cooled screw unit reliability.
In the present embodiment, the specific implementation of the supply water temperature value of evaporator and the return water temperature value of evaporator is detected
Are as follows:
The first temperature sensor is set in the outlet of the evaporator, the entrance setting second temperature of the evaporator senses
Device,
The supply water temperature value of evaporator is detected by the first temperature sensor；
The return water temperature value of evaporator is detected by second temperature sensor.
First temperature sensor and second temperature sensor specifically can be temperature sensing package, and the temperature-sensitive includes a set
Pipe, casing go deep into inside water pipe, and thermal bulb insert is placed in casing, it is ensured that the temperature value detected is channel interior water flow
Temperature, do not influenced by ambient temperature.
It, can in real time accurately by the way that a temperature sensor is respectively arranged in the outlet port of evaporator and entrance location
Obtain supply water temperature value and return water temperature value.
In the present embodiment, according to the supply water temperature value, the return water temperature value and fiducial temperature value, compressor is controlled
The flow direction of the refrigerant of discharge, specifically:
Bypass line is set between compressor air-discharging pipeline and evaporator pipeline, is arranged on the bypass line
One valve,
It is poor to be made according to the supply water temperature value and the return water temperature value, obtains the first difference；
The difference for calculating first difference Yu the fiducial temperature value, obtains the second difference,
The first valve opening is controlled according to second difference, the refrigerant that compressor is discharged directly is flowed by the first valve
Enter bypass line, and then returns to evaporator；
Or remain turned-off, the refrigerant that compressor is discharged is followed by condenser, device for drying and filtering, energy-saving appliance, finally
Return to evaporator.
The fiducial temperature that every cold Screw chiller of typhoon has it to fix, i.e., when engineering configures the specified water flow of unit, and master
Under machine oepration at full load state, the ideal value of the supply backwater temperature difference of air-cooled screw unit passes through the supply water temperature value that will be measured
It is poor to make with return water temperature value, obtains the first difference, the i.e. measured value of supply backwater temperature difference, then by the measured value and wind of supply backwater temperature difference
It is poor that the ideal value of the supply backwater temperature difference of cold Screw chiller is made, and obtains the second difference, i.e. the measured value of supply backwater temperature difference and for return water
The departure of the ideal value of the temperature difference is controlled by flow direction of the departure to the refrigerant that compressor is discharged, and then partially by this
Residual quantity is controlled in certain range, and the departure of the ideal value of the measured value of supply backwater temperature difference and supply backwater temperature difference is converted
To control signal, the supply backwater temperature difference measured value of the air-cooled screw unit according to variation is realized, the reality of the flow direction of refrigerant is carried out
When control.
It, will be low after the coolant distribution to bypass line, with throttling of compressor discharge by controlling the conducting of bypass line
Warm refrigerant mixing, is lifted into the refrigerant temperature of evaporator, by the distribution of the flow inside control air-cooled screw unit, effectively
The supply backwater temperature difference for controlling air-cooled screw unit keeps in a certain range, not needing to add external device (ED), also not needing to increase
External water supply, is particularly suitable in the insufficient situation of engineering water, controls supply backwater temperature difference.
In the present embodiment, the first valve opening is controlled according to second difference or remained turned-off, specifically included:
If second the first preset threshold of difference <, the first valve of control is remained turned-off；
If the second difference >=the first preset threshold, the first valve opening is controlled.
For example, fiducial temperature value is 5 DEG C, the first preset threshold is 5 DEG C,
If the supply water temperature value detected is 12 DEG C, return water temperature value is 2 DEG C, at this time the first difference=supply water temperature
Value-return water temperature value=10 DEG C, the fiducial temperature value be 5 DEG C, at this time the second difference=the first difference-fiducial temperature value=
5 DEG C, reach the first preset threshold, then control the first valve opening, the refrigerant that compressor is discharged directly is flowed by the first valve
Enter bypass line, and then returns to evaporator；
If the supply water temperature value detected is 12 DEG C, return water temperature value is higher than 2 DEG C, and the second difference=the first is poor at this time
Value -5 DEG C of fiducial temperature value <, then control the first valve and remain off, and the refrigerant that compressor is discharged is followed by condensation
Device, device for drying and filtering, energy-saving appliance, are eventually returned to evaporator.
By the open and close of the first valve, the flow direction of the refrigerant of compressor discharge is controlled, control method is simple, is easy
It realizes.
In the present embodiment, after controlling the first valve opening, further includes:
Current supply water temperature value and return water temperature value are detected, with the second difference described in real-time update；
Wherein, the second difference interval preset time is updated twice, that is, detects one group of supply water temperature value and return water temperature value
Detection time is spaced preset time with the detection time for detecting upper one group of supply water temperature value and return water temperature value.That is, periodically
Execute the detection operation of supply water temperature value and return water temperature value.The period can be the fixed cycle, i.e., above-mentioned preset time setting
For certain value, such as 10s.The period is also possible to the on-fixed period, and those skilled in the art can be adjusted according to actual needs
The length of the preset time.
According to second difference, the aperture of the second valve is adjusted, to adjust the refrigerant flow rate in the bypass line；
Wherein, second valve is arranged on the bypass line.
In the present embodiment, the specific adjusting method of refrigerant flow rate are as follows:
If second difference >=the first preset threshold, second valve opening is adjusted to initial set value, i.e.,
When the second difference >=first preset threshold, first valve opening is controlled, and the second valve opening is adjusted to just
Beginning setting value；
Wherein, the initial set value is definite value, the i.e. initial step number of the second valve；
If second the first preset threshold of difference <, increases opening for second valve described in the second preset threshold <
Degree；
Due to updating the second difference interval preset time twice, during this period of time, due to opening the first valve,
Theoretically the second difference can reduce, and continue to judge whether updated second difference meets described in the second preset threshold < at this time
Two the first preset thresholds of difference < increase the refrigerant flow rate in bypass line if it is satisfied, then increasing the aperture of the second valve,
Reduce the second difference at faster speed, more rapidly approaches fiducial temperature value；
If third predetermined threshold value≤second difference≤second preset threshold, keeps second valve currently to open
Degree；
Increase the refrigerant flow rate in bypass line by previous step, after the second difference reduces at faster speed, if
It is maintained in a stable region, meets third predetermined threshold value≤second difference≤second preset threshold, then can keep
Current aperture is constant；
If the second difference < third predetermined threshold value described in the 4th preset threshold <, reduces opening for second valve
Degree；
First difference, by being higher than fiducial temperature value, is gradually decrease to and fiducial temperature after the adjusting by certain time
It is worth equal, is further continued for being decreased to less than fiducial temperature value, and be gradually distance from preset value, at this point, to guarantee the first difference and pre-
If the bias of temperature difference, i.e. the second difference in a certain range, then needs to slow down the refrigerant flow rate in bypass line, that is, reduces
The aperture of second valve；
In the present embodiment, the second preset threshold < institute described in third predetermined threshold value < described in the 4th preset threshold <
State the first preset threshold, and first preset threshold, second preset threshold are positive value, the third predetermined threshold value with
4th preset threshold is negative value.
In the present embodiment, it when the second difference≤four preset threshold, controls first valve and closes, second
When difference≤four preset threshold, illustrate the detected value of supply backwater temperature difference with respect to the ideal value for being much smaller than supply backwater temperature difference,
It has at this time been not in that supply backwater temperature difference is excessive and caused a series of problems, it is therefore not necessary to again to compressor discharge
Refrigerant is shunted, also, the temperature regulation effect in order to guarantee air-cooled screw unit, at this point, the first valve need to be closed, makes to press
The refrigerant of contracting machine discharge is eventually returned to evaporator followed by condenser, device for drying and filtering, energy-saving appliance, that is, restores to operate normally
State.
The refrigerant traffic organising method of the present embodiment further include:
If second difference >=first preset threshold, sounds an alarm.
Control method through this embodiment, when can alleviate engineering water underfed, evaporator supply backwater temperature difference value mistake
Big problem, but a kind of emergency means can only be used as, it can not fundamentally solve the problems, such as insufficient water, therefore, also need
It takes timely measure, supplement supplies water, by sounding an alarm, with such in second difference >=first preset threshold
Mode causes relevant staff's note that water supply is replenished in time, and avoids equipment from running under water shortage state for a long time, energy
It is enough effectively to extend unit service life.
Embodiment 2
Fig. 2 is the structural block diagram of refrigerant flow control device according to an embodiment of the present invention, as shown in Fig. 2, the device packet
It includes:
First temperature sensor 10, is arranged in the outlet of the evaporator, for detecting the supply water temperature value of evaporator；
The entrance of the evaporator is arranged in second temperature sensor 20, for detecting the return water temperature value of evaporator；
Controller 30 connects first temperature sensor 10, second temperature sensor 20 and the first valve 40, is used for root
According to the supply water temperature value, the return water temperature value and fiducial temperature value, controls the first valve and close and open.
First valve 40 is arranged on bypass line, for making refrigerant flow to bypass line when opening, when closed
So that refrigerant flows to condenser；
Bypass line (not shown) is arranged between compressor air-discharging pipeline and evaporator pipeline, and being used for will
The refrigerant of compressor discharge imports evaporator pipeline.
In the present embodiment, the controller 30 is also used to be made according to the supply water temperature value and the return water temperature value
Difference obtains the first difference；The difference for calculating first difference Yu the fiducial temperature value, obtains the second difference, according to described
Two differences control first valve opening or remain turned-off；
In the present embodiment, as shown in figure 3, the volume control device further includes the second valve 50, it is arranged in the bypass
On pipeline, for adjusting the refrigerant flow rate in the bypass line；
The controller connects the second valve 50, is also used to after controlling first valve 40 and opening, real-time update institute
The second difference is stated, to adjust the aperture of the second valve 50.
In the present embodiment, which further includes that pressure maintains element (not shown), is arranged described
The junction of compressor air-discharging pipeline, the input end of condenser and the bypass line, for keeping the import side pressure of condenser
Power guarantees unit condensing pressure.
In the present embodiment, as shown in figure 4, the volume control device further include:
Alarm unit 60 connects the controller 30, in the supply water temperature value, the return water temperature value and fiducial temperature
Value, sounds an alarm.
Specifically, controller 30 is made poor according to the supply water temperature value and the return water temperature value, obtains the first difference；
The difference for calculating first difference Yu the fiducial temperature value, obtains the second difference；
Second difference >=first preset threshold, controller 30 controls alarm unit 60 and sounds an alarm, with such
Mode causes relevant staff's note that water supply is replenished in time, and avoids equipment from running under water shortage state for a long time, energy
It is enough effectively to extend unit service life.
Embodiment 3
The present embodiment provides a kind of air-cooled screw unit, which includes the refrigerant traffic organising dress in above-described embodiment 2
It sets, the low temperature refrigerant after the coolant distribution to bypass line, with throttling that compressor is discharged by the refrigerant flow control device
Mixing is lifted into the refrigerant temperature of evaporator, the supply backwater temperature difference of air-cooled screw unit is reduced, for realizing in engineering water supply
When amount is insufficient, unit supply backwater temperature difference is controlled, guarantees entire air-cooled screw unit reliability of operation.
Embodiment 4
Below by taking air-cooled screw unit as an example, the alternative embodiment that the present invention will be described in detail.
Fig. 5 is refrigerant traffic organising schematic diagram according to an embodiment of the present invention, as shown in figure 5, the present embodiment passes through bypass
Solenoid valve 10 (the first valve 40 i.e. in embodiment 2) and bypass electric expansion valve 11 (the second valve 50 i.e. in embodiment 2)
A part of high temperature refrigerant is bypassed, is mixed with the low temperature refrigerant after throttling, (the steaming i.e. in embodiment 2 of shell-tube evaporator 9 is lifted into
Send out device) refrigerant temperature, pass through chilled water water supply temperature sensing package 8a (the first temperature sensor 10), chilled water return water temperature sensing package 8b
The supply and return water temperature difference of (second temperature sensor 20 i.e. in embodiment 2) detection adjusts bypass electric expansion valve 11, pressure
It maintains valve 2 to guarantee unit condensing pressure, guarantees that package when there is not bursting by freezing, provides user's cooling capacity to greatest extent.Simultaneously
" flow is too low " alarm is issued to user, before user does not carry out project treatment, unit still is able to reliable and stable operation.
Specifically, the bypass initial step number of electric expansion valve 11 is B1, poor according to every 10s supply and return water temperature of detection, and
It is adjusted, adjusts Bx step in current aperture every time, wherein the supply water temperature value that chilled water water supply temperature sensing package 8a is detected is
T1, the return water temperature value that chilled water return water temperature sensing package 8b is detected are T2,
Then, water temperature difference Tx=T2-T1；
Each unit has design water temperature difference (the fiducial temperature value i.e. in embodiment 1), it is assumed that and design water temperature difference is A DEG C,
When the engineering configuration specified water flow of unit, when host oepration at full load, Tx=A, when actual water temperature difference Tx reaches than designing water
Temperature difference A is 5 DEG C big, i.e. when Tx >=A+5, is defaulted as engineering water flow and relatively low phenomenon occur, long-play may cause evaporation
Device water temperature is lower, icing phenomenon occurs；
Specifically adjustment process is as follows:
As Tx >=A+5, control bypass solenoid valve 10 is opened, and is bypassed electric expansion valve 11 and opened to initial step number B1,
Bypass electric expansion valve 11 is controlled according to water temperature difference Tx and design water temperature difference A, while complete machine issues " flow by mainboard
It is too low " alarm, prompt user to verify engineering water flow as early as possible:
Further,
1) as 1 < Tx-A < 5, bypass electric expansion valve 11 increases stride Bx on the basis of current step number；
As -1≤Tx-A≤1, bypass electric expansion valve 11 keeps current step number；
As Tx-A < -1, bypass electric expansion valve 11 reduces stride Bx on the basis of current step number；
2) as -2 < Tx-A < 5, control bypass solenoid valve 10 is kept it turned on；
3) as Tx-≤- 2, control bypass solenoid valve 10 is closed.
Wherein, the variable quantity of bypass solenoid valve 10 is two states, can only be opened or closed, bypass electric expansion valve 11
Variable quantity is analog quantity, can continuously adjust aperture according to actual needs.
By the above method, when engineering water flow is relatively low, unit inner damping member load, so that shell-tube evaporator 9
Heat exchange amount reduces, and guarantees package supply backwater temperature difference value, guarantees the reliable fortune that unit can continue before user handles water flow
Row will not lead to unit unreliable operation for a long time because of checking not in time, and then serious damage occurs, through this embodiment
Method can guarantee whole aircraft reliability, and can effectively extend unit service life.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
It realizes by means of software and necessary general hardware platform, naturally it is also possible to pass through hardware.Based on this understanding, on
Stating technical solution, substantially the part that contributes to existing technology can be embodied in the form of software products in other words, should
Computer software product may be stored in a computer readable storage medium, such as ROM/RAM, magnetic disk, CD, including several fingers
It enables and using so that a computer equipment (can be personal computer, server or the network equipment etc.) executes each implementation
Method described in certain parts of example or embodiment.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (14)
1. a kind of refrigerant traffic organising method characterized by comprising
Detect the supply water temperature value of evaporator and the return water temperature value of evaporator；
According to the supply water temperature value, the return water temperature value and fiducial temperature value, the flow direction of the refrigerant of compressor discharge is controlled.
2. the method according to claim 1, wherein the supply water temperature value of detection evaporator and the return water of evaporator
Temperature value, comprising:
The supply water temperature value of evaporator is detected by the first temperature sensor；
The return water temperature value of evaporator is detected by second temperature sensor；
Wherein, the outlet of the evaporator is arranged in first temperature sensor, and the second temperature sensor is arranged in institute
State the entrance of evaporator.
3. the method according to claim 1, wherein according to the supply water temperature value, the return water temperature value and
Fiducial temperature value, the flow direction of the refrigerant of control compressor discharge, comprising:
It is poor to be made according to the supply water temperature value and the return water temperature value, obtains the first difference；
The difference for calculating first difference Yu the fiducial temperature value, obtains the second difference,
The first valve opening is controlled according to second difference or is remained turned-off, and flows into side to control the refrigerant of compressor discharge
Siphunculus road or condenser；
Wherein, the bypass line is arranged between compressor air-discharging pipeline and evaporator pipeline, and first valve is set
It sets on bypass line.
4. according to the method described in claim 3, it is characterized in that, according to second difference control the first valve opening or
It remains turned-off, comprising:
If second the first preset threshold of difference <, the first valve of control is remained turned-off；
If the second difference >=the first preset threshold, the first valve opening is controlled.
5. according to right want 4 described in method, which is characterized in that control the first valve opening after, the method also includes:
Current supply water temperature value and return water temperature value are detected, with the second difference described in real-time update；
According to second difference, the aperture of the second valve is adjusted, to adjust the refrigerant flow rate in the bypass line；
Wherein, second valve is arranged on the bypass line.
6. according to right want 5 described in method, which is characterized in that according to second difference, adjust the aperture of the second valve, packet
It includes:
If second difference >=the first preset threshold, second valve opening is adjusted to initial set value；Wherein, institute
Stating initial set value is definite value；
If second the first preset threshold of difference < described in the second preset threshold <, increases the aperture of second valve；
If third predetermined threshold value≤second difference≤second preset threshold keeps the current aperture of the second valve；
If the second difference < third predetermined threshold value described in the 4th preset threshold < reduces the aperture of second valve；
Wherein, the first default threshold described in the second preset threshold < described in third predetermined threshold value < described in the 4th preset threshold <
Value.
7. according to the method described in claim 6, it is characterized in that, the method also includes:
When the second difference≤four preset threshold, controls first valve and close.
8. according to the method described in claim 4, it is characterized in that, the method also includes:
If second difference >=first preset threshold, sounds an alarm.
9. a kind of refrigerant flow control device characterized by comprising
The outlet of the evaporator is arranged in first temperature sensor, for detecting the supply water temperature value of evaporator；
The entrance of the evaporator is arranged in second temperature sensor, for detecting the return water temperature value of evaporator；
Controller, for controlling the first valve and closing according to the supply water temperature value, the return water temperature value and fiducial temperature value
And unlatching.
First valve is arranged on bypass line, for making refrigerant flow to bypass line when opening, makes when closed
It obtains refrigerant and flows to condenser；
The bypass line is arranged between compressor air-discharging pipeline and evaporator pipeline, for what compressor was discharged
Refrigerant imports evaporator pipeline.
10. device according to claim 9, which is characterized in that
The controller, it is poor to be also used to be made according to the supply water temperature value and the return water temperature value, obtains the first difference；It calculates
The difference of first difference and the fiducial temperature value, obtains the second difference, controls first valve according to second difference
Door is opened or is remained turned-off.
11. device according to claim 10, which is characterized in that
The controller is also used to after controlling first valve opening, the second difference described in real-time update, to adjust second
The aperture of valve.
Second valve is arranged on the bypass line, for adjusting the refrigerant flow rate in the bypass line.
12. device according to claim 9, which is characterized in that described device further include:
Pressure maintains element, and the connection of the compressor air-discharging pipeline, the input end of condenser and the bypass line is arranged in
Place, for keeping the import end pressure of condenser.
13. device according to claim 10, which is characterized in that described device further include:
Alarm unit connects the controller, for being sounded an alarm according to second difference.
14. a kind of air-cooled screw unit, which is characterized in that flow to and control including refrigerant described in any one of claim 9 to 13
Device processed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113834246A (en) * | 2021-09-16 | 2021-12-24 | 珠海格力电器股份有限公司 | Control method and device of bypass valve, controller and refrigeration equipment |
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Application publication date: 20191112 |