CN107702390A - A kind of carbon dioxide refrigerant high accuracy filling system and method - Google Patents
A kind of carbon dioxide refrigerant high accuracy filling system and method Download PDFInfo
- Publication number
- CN107702390A CN107702390A CN201711168056.8A CN201711168056A CN107702390A CN 107702390 A CN107702390 A CN 107702390A CN 201711168056 A CN201711168056 A CN 201711168056A CN 107702390 A CN107702390 A CN 107702390A
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- Prior art keywords
- carbon dioxide
- filling
- pressure
- refrigerant
- temperature
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Classifications
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- 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
- F25B45/00—Arrangements for charging or discharging refrigerant
-
- 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
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/001—Charging refrigerant to a cycle
-
- 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
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/007—Details for charging or discharging refrigerants; Service stations therefor characterised by the weighing of refrigerant or oil
Abstract
The invention provides a kind of carbon dioxide refrigerant high accuracy filling system and method, including pressure-reducing valve, cooler, handpiece Water Chilling Units, flowmeter, data acquisition process and control device etc..It is characterized in：The carbon dioxide from steel cylinder is cooled down using handpiece Water Chilling Units, the carbon dioxide refrigerant of system outlet is in liquid phase region all the time by data acquisition process and control device, and calculate the charging amount of carbon dioxide refrigerant.The present invention solves the problems, such as that conventional carbon dioxide coolant injection system causes charging amount metering inaccurate greatly because being operated in supercritical region, variable density；Have the advantages that automaticity is high, refrigerant charging precision is high.
Description
Technical field
The present invention relates to refrigeration technology field, more particularly to a kind of carbon dioxide refrigerant high accuracy filling system and method.
Background technology
With the development of environmental protection refrigerant, carbon dioxide is increasingly used widely as alternative refrigerant.Using two
As refrigerant, the distinguishing feature that its thermodynamic parameter has is carbonoxide：Its critical point temperature (31 DEG C) is far below
The critical point temperature (such as R134a critical point temperature is 101.1 DEG C) of conventional refrigerant, critical-point pressure (73.6bar) are remote high
In the critical-point pressure (such as R134a critical-point pressure is 40.7bar) of conventional refrigerant, as shown in Figure 2.
When environment temperature is higher than 31 DEG C of critical point temperature, the carbon dioxide in high-pressure cylinder is in supercritical region.Super
In critical zone, the variable density of carbon dioxide is very acutely complicated, without rule；And in the condition less than critical point temperature
Under, the variable density of carbon dioxide is slow and regular, as shown in Figure 3.Therefore, easily made using the refrigerant charging method of routine
The problem of into charging amount inaccuracy, the normal performance of refrigeration system is have impact on, particularly with small carbon dioxide refrigeration system
Performance impact is more notable.A kind of it would therefore be desirable to system and method that can accurately control carbon dioxide refrigerant charging amount.
The content of the invention
It is contemplated that overcome drawbacks described above, there is provided a kind of system that can accurately control carbon dioxide refrigerant charging amount and
Method, technology is filled using liquid coolant.
The invention provides a kind of method that carbon dioxide refrigerant fills in high precision, the system for carbon dioxide refrigerating system
Cryogen fills, it is characterised in that：Controlled by filling pressure to carbon dioxide and filling the coordination of temperature, make carbon dioxide all the time
It is maintained at liquid phase region；
Wherein, when filling pressure is higher than critical pressure, control filling temperature is below 31 DEG C；Face when filling pressure is less than
During boundary's pressure, control fills the cold-zone excessively that temperature makes the carbon dioxide of filling be in liquid phase.
Further, the method that a kind of carbon dioxide refrigerant provided by the invention fills in high precision, also have such special
Point：I.e., collection carbon dioxide fills pressure, filling temperature in real time, after calculating filling density in real time, with reference to the stream gathered in real time
Gauge number, calculate accumulative coolant injection amount；
When coolant injection amount reaches setting value, filling is automatically stopped.
In addition, present invention also offers a kind of carbon dioxide refrigerant high accuracy filling system, for carbon dioxide refrigeration system
The refrigerant charging of system, it is characterised in that：Including carbon dioxide pipe subsystems, freezing water subsystem and data collection and control
Subsystem；
Wherein, above-mentioned carbon dioxide pipe subsystems, coolant injection is carried out for providing carbon dioxide；
Above-mentioned freezing water subsystem, for being cooled down to carbon dioxide；
Above-mentioned data acquisition and control subsystem, for carbon dioxide pipe subsystems and freezing water subsystem system
The collection of parameters data is (such as in system：The data such as temperature and pressure of the carbon dioxide before and after each equipment is flowed through), and it is right
Each equipment in system is adjusted and controlled (i.e., according to the regulation scheme of setting, to each plant capacity, frequency, refrigeration
Etc. being adjusted, so as to control temperature and pressure change of the carbon dioxide during filling).
Further, a kind of carbon dioxide refrigerant high accuracy filling system provided by the invention, also has a structure in which
Feature：I.e., including being set in turn in refrigerant pipeline, (refrigerant pipeline is used to convey titanium dioxide above-mentioned carbon dioxide pipe subsystems
Carbon) on carbon dioxide supply arrangement, pressure control mechanism, cooling body and disabling mechanism；
The carbon dioxide supply arrangement, which is generally carbon dioxide steel cylinder etc., can store the container of carbon dioxide, the titanium dioxide
Pressure gauge is generally provided with carbon supply equipment, is used for the equipment of pressure and storage in monitoring device with scale etc.；
The pressure control mechanism is generally adjustable equipment such as pressure-reducing valve, by the regulation to the equipment, can control
The gas or the pressure of liquid or flow flowed through；
The cooling body is generally handpiece Water Chilling Units, and by modes such as chilled waters, the carbon dioxide flowed through is cooled down；
The disabling mechanism is generally the equipment that stop valve or switch etc. make pipeline unimpeded or closed, by the disabling mechanism
Regulation can realize carbon dioxide filling or stop filling.
Above-mentioned freezing water subsystem includes cooling water mechanism, from the freezing liquid or gas of the outflow of cooling water mechanism, stream
Returned to after cooling body in cooling water mechanism.
Further, a kind of carbon dioxide refrigerant high accuracy filling system provided by the invention, also has a structure in which
Feature：I.e., it is additionally provided with dry filter equipment before above-mentioned cooling body and disabling mechanism.Enter for the liquid to flowing through or gas
Deimpurity effect is dried and gone to row.
Further, a kind of carbon dioxide refrigerant high accuracy filling system provided by the invention, also has a structure in which
Feature：I.e., above-mentioned freezing water subsystem also includes liquid transporting body；
The liquid transporting body, which is generally pump etc., can input liquid from an equipment in the device of another equipment；
The in-house freezing of cooling water is conveyed into cooling body by aforesaid liquid conveying mechanism with liquid；
Flowmeter is additionally provided between above-mentioned cooling body and disabling mechanism；
The flowmeter is used to count the parameter such as the flow velocity of liquid and flow in current pipeline；
The entrance of above-mentioned flowmeter is provided with pressure monitoring/sensor and temperature monitoring/sensor.
Further, a kind of carbon dioxide refrigerant high accuracy filling system provided by the invention, also has a structure in which
Feature：I.e., above-mentioned data acquisition and control subsystem and pressure monitoring/sensor and temperature monitoring/sensor, flowmeter,
Pressure control mechanism, disabling mechanism, liquid transporting body electrical connection；
Above-mentioned data acquisition is filled with control subsystem by pressure monitoring/sensor and temperature monitoring/sensor
The pressure and temperature data of carbon dioxide injection, and filling density is obtained according to the data, with reference to the real-time streams obtained from flowmeter
Enumeration data is measured, obtains accumulative charging amount；
When pressure or temperature do not meet setting range, by adjust pressure control mechanism and/or liquid transporting body come
Adjust pressure and temperature scope；
When accumulative charging amount reaches setting value, disabling mechanism is closed automatically.
Further, a kind of carbon dioxide refrigerant high accuracy filling system provided by the invention, also has a structure in which
Feature：I.e., above-mentioned freezing water subsystem is cooled down using natural cold source or artificial cold source to carbon dioxide, such as：Can be with
Carbon dioxide is cooled down using other any low-temperature receivers such as phreatic water, surrounding air, chilled water and the type of cooling.
Further, a kind of carbon dioxide refrigerant high accuracy filling system provided by the invention, also has a structure in which
Feature：I.e., above-mentioned carbon dioxide pipe subsystems also include heater；
Above-mentioned heater is arranged at the outer surface of carbon dioxide supply arrangement, for being carried out to carbon dioxide supply arrangement
Heating.The heater can be the zone of heating for the electrical heating or other mode of heatings being wrapped in outside carbon dioxide supply arrangement,
Filling pressure is improved when coolant quantity is less in the carbon dioxide steel cylinder, the heat that coolant adding evaporation needs.
In addition, a kind of carbon dioxide refrigerant high accuracy filling system provided by the invention, is preferably placed in air-conditioned room,
It is advantageous to improve the stability of system operation and the precision of charging amount.
In addition, in the above method or system, carbon dioxide is replaced by any refrigerant.
The effect of the present invention and effect
The present invention is cooled down using handpiece Water Chilling Units to the carbon dioxide from steel cylinder, at data acquisition
Reason makes the carbon dioxide refrigerant of system outlet be in liquid phase region all the time with control device, and calculates the filling of carbon dioxide refrigerant
Amount.
According to a kind of carbon dioxide refrigerant high accuracy filling system involved in the present invention and method, because cooler sum
According to collection and the effect of control device, either under high temperature summer environment, or pressure carbon dioxide in steel cylinder is in height
In critical pressure again below under critical pressure, making the carbon dioxide of filling be in the liquid phase region of density change.It is logical
Data acquisition and control device is crossed, with reference to the N I ST hot physical property software of refrigerant, realizes the high-precision control to charging amount.Solution
Conventional carbon dioxide coolant injection system of having determined causes charging amount metering inaccurate greatly because being operated in supercritical region, variable density
The problem of；Have the advantages that automaticity is high, refrigerant charging precision is high, the popularization of environmental protection refrigerant carbon dioxide can be promoted
Using.
Brief description of the drawings
A kind of carbon dioxide refrigerant high accuracy filling system and the structural representation of method that accompanying drawing 1, the present embodiment are related to；
Wherein, 1- carbon dioxide steel cylinders；
2- pressure gauges 1；
3- pressure-reducing valves；
4- coolers；
5- devices for drying and filtering；
6- pressure gauges 2；
7- pressure sensors；
8- temperature sensors；
9- flowmeters；
10- stop valves；
11- water pumps；
12- handpiece Water Chilling Units；
13- data acquisition process and control device.
The pressure-enthalpy chart of accompanying drawing 2, carbon dioxide.
Accompanying drawing 3, carbon dioxide density with pressure, temperature change curve.
Specific embodiment
As shown in figure 1, a kind of carbon dioxide refrigerant high accuracy filling system is present embodiments provided, for carbon dioxide system
The refrigerant charging of cooling system, including：Carbon dioxide pipe subsystems, freezing water subsystem and data collection and control subsystem
System.
Wherein, the carbon dioxide pipe subsystems, for providing carbon dioxide filling refrigerant, comprising：For providing high pressure
The carbon dioxide steel cylinder (1) of carbon dioxide refrigerant, carbon dioxide steel cylinder (1) outlet refrigerant pipeline on be sequentially connected pressure gauge 1
(2), pressure-reducing valve (3), cooler (4), device for drying and filtering (5), pressure gauge 2 (6), flowmeter (9), stop valve (10).
The entrance point of the flowmeter (9) is connected with pressure sensor (7) and temperature sensor (8).
The freezing water subsystem, for providing chilled water to cooler, comprising：Handpiece Water Chilling Units (12) and water pump (13), it is cold
The delivery port of water dispenser group (12) is connected with the water inlet of water pump (13), the water inlet of the delivery port of water pump (13) and cooler (4)
Connection, the delivery port of cooler (4) is connected with the water inlet of handpiece Water Chilling Units (12), and during operation, water pump is by chilled water
It is pumped into cooler after being cooled down to the carbon dioxide pipeline that flows through, flows into and circulation loop is formed in handpiece Water Chilling Units.Wherein, should
Water pump (13) can be variable frequency pump, or other water pump types that can control water-carrying capacity.
In addition, the outside of the carbon dioxide steel cylinder is also enclosed with heating mantle, when the coolant quantity in steel cylinder is less by adding
Filling pressure is improved outside hot steel cylinder, the heat that coolant adding evaporation needs.
The data acquisition and control subsystem, data acquisition is carried out to carbon dioxide pipe subsystems and freezing water subsystem
Controlled with operation, and measure coolant injection amount, the data acquisition and control subsystem and pressure sensor (7), temperature sensor
(8), flowmeter (9), pressure-reducing valve (3), stop valve (10), water pump (11) electrical connection.
During operation, the data acquisition and control device collection pressure sensor, temperature sensor and flowmeter
Real-time measuring data, decompression valve opening is then adjusted according to measurement data and controls the filling pressure of carbon dioxide, passes through water
The flow of pump control chilled water carrys out the filling temperature of regulation of carbon dioxide.
Controlled by filling pressure and filling the coordination of temperature, the carbon dioxide of filling is in liquid phase region：When filling is pressed
When power is higher than critical pressure, control filling temperature keeps carbon dioxide in the liquid phase region of supercritical region below 31 DEG C；Work as filling
When pressure is less than critical pressure, control the chilled-water flow of water pump to carry out cooled carbon dioxide, the carbon dioxide of filling is in liquid
Phase crosses cold-zone.It is close that data acquisition and control device by the filling pressure and filling temperature that gather in real time calculate filling in real time
Degree, in conjunction with the real-time flow meter parameter of collection, cumulative calculation coolant injection amount.When coolant injection amount reaches setting value, from
It is dynamic to close stop valve, stop filling.
In addition, in order to improve the precision of the stability of system operation and charging amount, it is preferably that the carbon dioxide refrigerant is high-precision
Degree filling system, which is positioned in air-conditioned room, to be used.
Claims (10)
1. a kind of method that carbon dioxide refrigerant fills in high precision, for the refrigerant charging of carbon dioxide refrigerating system, it is special
Sign is：Controlled by filling pressure to carbon dioxide and filling the coordination of temperature, carbon dioxide is remained at liquid phase region；
Wherein, when filling pressure is higher than critical pressure, control filling temperature is below 31 DEG C of critical point temperature；When filling pressure
During less than critical pressure, control fills the cold-zone excessively that temperature makes the carbon dioxide of filling be in liquid phase.
2. the method that a kind of carbon dioxide refrigerant as claimed in claim 1 fills in high precision, it is characterised in that：Gather titanium dioxide
Carbon fills pressure, filling temperature in real time, after calculating filling density in real time, is counted with reference to the flow gathered in real time, calculates accumulative
Coolant injection amount；
When coolant injection amount reaches setting value, filling is automatically stopped.
A kind of 3. carbon dioxide refrigerant high accuracy filling system, for the refrigerant charging of carbon dioxide refrigerating system, its feature
It is：Including carbon dioxide pipe subsystems, freezing water subsystem and data collection and control subsystem；
Wherein, above-mentioned carbon dioxide pipe subsystems, coolant injection is carried out for providing carbon dioxide；
Above-mentioned freezing water subsystem, for being cooled down to carbon dioxide；
Above-mentioned data acquisition and control subsystem, in carbon dioxide pipe subsystems and freezing water subsystem carry out system
The collection of parameters data, and each equipment in system is adjusted and controlled.
A kind of 4. carbon dioxide refrigerant high accuracy filling system as claimed in claim 3, it is characterised in that：
The carbon dioxide pipe subsystems include carbon dioxide supply arrangement, the Stress control being set in turn on refrigerant pipeline
Mechanism, cooling body and disabling mechanism；
The freezing water subsystem includes chilled water mechanism, from the freezing liquid or gas of the outflow of chilled water mechanism, flows through cold
But returned to after mechanism in chilled water mechanism.
A kind of 5. carbon dioxide refrigerant high accuracy filling system as claimed in claim 4, it is characterised in that：
Dry filter equipment is additionally provided with before the cooling body and disabling mechanism.
A kind of 6. carbon dioxide refrigerant high accuracy filling system as claimed in claim 4, it is characterised in that：
The freezing water subsystem also includes liquid transporting body；
The in-house freezing of chilled water is conveyed into cooling body by the liquid transporting body with liquid；
Flowmeter is additionally provided between the cooling body and disabling mechanism；
The entrance of the flowmeter is provided with pressure monitoring/sensor and temperature monitoring/sensor.
A kind of 7. carbon dioxide refrigerant high accuracy filling system as claimed in claim 3, it is characterised in that：
The data acquisition and control subsystem and pressure monitoring/sensor and temperature monitoring/sensor, flowmeter, pressure
Controlling organization, disabling mechanism, liquid transporting body electrical connection；
The data acquisition obtains filling two with control subsystem by pressure monitoring/sensor and temperature monitoring/sensor
The pressure and temperature data of carbonoxide, and filling density is obtained according to the data, with reference to the real-time flow meter obtained from flowmeter
Number data, obtain accumulative charging amount；
When pressure or temperature do not meet setting range, adjusted by adjusting pressure control mechanism and/or liquid transporting body
Pressure and temperature scope；
When accumulative charging amount reaches setting value, disabling mechanism is closed.
A kind of 8. carbon dioxide refrigerant high accuracy filling system as claimed in claim 4, it is characterised in that：
The freezing water subsystem is cooled down using natural cold source or artificial cold source to carbon dioxide.
A kind of 9. carbon dioxide refrigerant high accuracy filling system as claimed in claim 3, it is characterised in that：
Above-mentioned carbon dioxide pipe subsystems also include heater, and are arranged at the appearance of the carbon dioxide supply arrangement
Face.
10. the carbon dioxide as described in claim 1-9 is any, it is characterised in that：The carbon dioxide is replaced by any system
Cryogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711168056.8A CN107702390A (en) | 2017-11-21 | 2017-11-21 | A kind of carbon dioxide refrigerant high accuracy filling system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711168056.8A CN107702390A (en) | 2017-11-21 | 2017-11-21 | A kind of carbon dioxide refrigerant high accuracy filling system and method |
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| CN107702390A true CN107702390A (en) | 2018-02-16 |
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| CN201711168056.8A Pending CN107702390A (en) | 2017-11-21 | 2017-11-21 | A kind of carbon dioxide refrigerant high accuracy filling system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111981732A (en) * | 2020-07-24 | 2020-11-24 | 中标能效科技（北京）有限公司 | Automatic refrigerant filling device and method |
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| CN111981732A (en) * | 2020-07-24 | 2020-11-24 | 中标能效科技（北京）有限公司 | Automatic refrigerant filling device and method |
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Application publication date: 20180216 |