CN115574495A - Capillary tube calibration device system and method for variable working condition and variable flow - Google Patents
Capillary tube calibration device system and method for variable working condition and variable flow Download PDFInfo
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- CN115574495A CN115574495A CN202211442569.4A CN202211442569A CN115574495A CN 115574495 A CN115574495 A CN 115574495A CN 202211442569 A CN202211442569 A CN 202211442569A CN 115574495 A CN115574495 A CN 115574495A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005057 refrigeration Methods 0.000 claims abstract description 59
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000003507 refrigerant Substances 0.000 claims abstract description 31
- 239000007789 gas Substances 0.000 claims abstract description 27
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims description 42
- 238000001704 evaporation Methods 0.000 claims description 21
- 230000008020 evaporation Effects 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 238000009833 condensation Methods 0.000 claims description 7
- 230000005494 condensation Effects 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 4
- 238000000691 measurement method Methods 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/37—Capillary tubes
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention provides a capillary tube calibration device system and a calibration method for variable working condition and variable flow, wherein the device system comprises a refrigeration unit and a calibration unit; the refrigerating unit comprises 1 refrigerating cycle main path and 2 bypass branches, and the 2 bypass branches are respectively and independently connected to the refrigerating cycle main path in parallel; a compressor, a condenser, an electronic expansion valve and an evaporator are sequentially and serially arranged on the refrigeration cycle main path; the calibration unit comprises a nitrogen cylinder, a capillary tube and a gas flowmeter which are sequentially arranged on a calibration pipeline in series; the electronic expansion valve on the main refrigeration cycle path is connected in parallel with the capillary tube on the calibration pipeline. The calibration method comprises the steps of operating the refrigeration unit to obtain the valve steps of the electronic expansion valve under the set refrigeration working condition and the refrigerant flow, and then calibrating the capillary specification under the same flow characteristic by adopting a nitrogen measurement method, so that the calibration of the capillary specification is realized when the refrigeration working condition or the refrigerant flow changes, and the calibration accuracy is improved.
Description
Technical Field
The invention belongs to the technical field of refrigeration, relates to a capillary tube calibration device system, and particularly relates to a capillary tube calibration device system and a calibration method aiming at variable working conditions and variable flow.
Background
A refrigeration system is a system of devices that uses external energy to transfer heat from a lower temperature substance/environment to a higher temperature substance/environment, and mainly includes a compressor, a condenser, a throttling element, and an evaporator. The capillary tube is used as the most common throttling element in the refrigeration system, and is widely applied to small refrigeration devices due to the advantages of simple structure, low price, stability, reliability and the like. However, the capillary tubes with different specifications have different refrigeration performances in the same set of refrigeration device, and in order to meet the refrigeration performance required by customers, manufacturers producing the refrigeration devices often need to calibrate the capillary tubes under different working conditions.
The most popular capillary calibration method in the market at present is a nitrogen calibration method, which calibrates the flow characteristics of capillaries with different specifications, indicates the specific influence of the length, the inner diameter and the pressure drop of the capillary on the flow, and indicates the direction for designing and selecting the specification and the model of the capillary by customers. However, for different refrigerants or refrigeration conditions, what specification of capillary tube should be selected to meet specific refrigeration requirements, and the customer still cannot know the specification.
CN 114440504A discloses a refrigeration system, which includes a compressor, a condenser, a switch assembly, an evaporator and a double-layer liquid separator, which are arranged in series on a main refrigeration path; an exhaust port of the compressor is connected with an inlet of a condenser, and the condenser is used for liquefying first refrigerating gas discharged by the compressor into refrigerating fluid; the inlet of the evaporator is connected with the outlet of the condenser, and the evaporator is used for evaporating the refrigerant liquid into second refrigerant gas; the air inlet of the compressor is connected with the outlet of the evaporator, and the evaporator is used for discharging the second refrigerating gas into the compressor; the switch assembly comprises a first electromagnetic valve and an electronic expansion valve which are arranged in series, and the first electromagnetic valve and the electronic expansion valve are sequentially arranged on a refrigeration main circuit between the outlet of the condenser and the inlet of the evaporator in series; the first electromagnetic valve is used for controlling the flow and the cut-off of the refrigerant liquid, and the electronic expansion valve is used for controlling the flow of the refrigerant liquid; the double-layer liquid separator is arranged on a refrigeration main circuit between the electronic expansion valve and an inlet of the evaporator in series, and comprises a first capillary tube and a second capillary tube. However, the refrigeration system does not involve calibration of the capillary tube, and the specification selection of the capillary tube is difficult to determine when the refrigeration condition or the refrigerant flow changes.
Therefore, how to provide a capillary tube calibration device system and a calibration method aiming at variable working conditions and variable flow, when the refrigerating working conditions or the refrigerant flow are changed, the required specification of the capillary tube is convenient to calibrate, and the capillary tube calibration device system and the capillary tube calibration method become problems which are urgently needed to be solved by technical personnel in the field at present.
Disclosure of Invention
The invention aims to provide a capillary tube calibration device system and a calibration method aiming at variable working condition and variable flow, which realize the calibration of the specification of the capillary tube when the refrigerating working condition or the flow of a refrigerant is changed, improve the calibration accuracy, and have the advantages of simple and easy calibration method and convenience for large-scale popularization and application.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a capillary tube calibration device system for variable working condition and variable flow, which comprises a refrigeration unit and a calibration unit.
The refrigerating unit comprises 1 refrigerating cycle main path and 2 bypass branches, and the 2 bypass branches are respectively and independently connected in parallel on the refrigerating cycle main path.
The refrigeration cycle main path is sequentially provided with a compressor, a condenser, an electronic expansion valve and an evaporator in series.
The calibration unit comprises a nitrogen cylinder, a capillary tube and a gas flowmeter which are sequentially and serially arranged on the calibration pipeline.
The electronic expansion valve on the main refrigeration cycle path is connected in parallel with the capillary tube on the calibration pipeline.
The device system provided by the invention combines the refrigeration unit and the calibration unit, realizes the accurate calibration of the specification of the capillary tube under variable working conditions and variable flow by means of the switching between the electronic expansion valve and the capillary tube which are connected in parallel and the principle that the gas flow is the same under the same pressure difference according to the components with the same resistance characteristic, and further indicates the direction for designing and selecting the specification and the model of the capillary tube by customers.
Preferably, the refrigeration cycle main circuit is sequentially provided with a compressor, a condenser, a liquid storage device, a liquid sight glass, a liquid flow meter, an electronic expansion valve, an evaporator, an evaporation pressure regulating valve and a gas-liquid separator in series, and the gas-liquid separator is connected with the compressor in a return mode.
Preferably, a variable frequency fan is arranged on the condenser.
Preferably, the 2 bypass branches include a first bypass branch and a second bypass branch.
Preferably, one end of the first bypass branch is arranged between the liquid observation mirror and the liquid flowmeter, the other end of the first bypass branch is arranged between the evaporation pressure regulating valve and the gas-liquid separator, and the first solenoid valve and the thermostatic expansion valve are sequentially arranged on the first bypass branch in series.
Preferably, one end of the second bypass branch is arranged between the compressor and the condenser, the other end of the second bypass branch is arranged between the evaporation pressure regulating valve and the gas-liquid separator, and the second bypass branch is sequentially provided with a second electromagnetic valve and a hot gas bypass valve in series.
In the invention, the low-temperature and low-pressure gas-liquid mixed refrigerant in the first bypass branch and the high-temperature and high-pressure refrigerant gas in the second bypass branch are mixed with each other and then mixed with the refrigerant in the main refrigeration cycle path to enter the gas-liquid separator and the compressor in sequence. The 2 bypass branches not only prevent the phenomenon of negative pressure pulling at the air suction port of the compressor when the flow of the main refrigeration cycle path is too small, but also avoid the phenomenon of overhigh return air temperature or liquid carrying of the compressor by adjusting the opening degrees of the thermostatic expansion valve and the hot gas bypass valve.
Preferably, still be provided with the high pressure between condenser and the reservoir and fill the module, just the high pressure fills the module and includes voltage-controlled switch, high-pressure gauge and needle valve.
In the invention, when the high voltage exceeds the set value due to the abnormality of the device system, the voltage-controlled switch can cut off the power supply in time, thereby preventing the compressor from being damaged due to long-term high-voltage operation; the high pressure gauge is used for displaying the condensing pressure so as to be convenient for converting the condensing temperature; the needle valve is used for filling the refrigerant.
Preferably, a low-pressure filling module is further arranged between the gas-liquid separator and the compressor, and the low-pressure filling module comprises a low-pressure meter, a shutoff valve and a needle valve.
In the invention, the low pressure gauge is used for displaying the suction pressure of the compressor; the arrangement of the shut-off valve prevents lubricating oil from entering a low-pressure meter during filling to cause damage to the meter; the needle valve is used for filling the refrigerant and the lubricating oil.
According to the invention, the high-pressure filling module and the low-pressure filling module are arranged to realize smooth filling of the system refrigerant and timely detection of the running state of the compressor.
Preferably, the refrigeration cycle main path is further provided with a temperature sensor, a dry filter, a ball valve, a shut-off valve, a pressure sensor and a check valve.
Preferably, the calibration pipeline is further provided with a pressure reducing valve, a pressure gauge, a shutoff valve, a needle valve and a quick connector.
In the present invention, the specific number and position of the above components are determined by conventional technical means in the field, and the specific number and position are not particularly limited as long as the corresponding function can be realized.
In a second aspect, the present invention provides a method for calibrating a capillary tube using the capillary tube calibration device system according to the first aspect, the method comprising the steps of:
(1) Operating the refrigeration unit, and respectively adjusting the refrigeration working condition and the refrigerant flow to set values to obtain a valve step of the electronic expansion valve; the refrigeration working condition comprises a condensation temperature and an evaporation temperature;
(2) Closing the refrigeration unit, communicating the parallel branch where the electronic expansion valve is located with the calibration pipeline, and closing the parallel branch where the capillary tube is located;
(3) Operating the calibration unit, keeping the valve step of the electronic expansion valve obtained in the step (1) unchanged, and adjusting the pressure of nitrogen on the calibration pipeline to P sv Recording the value of the gas flowmeter as Q;
(4) Communicating the parallel branch where the capillary tube is located with a calibration pipeline, and closing the parallel branch where the electronic expansion valve is located;
(5) Adjusting the capillary tubes with different specifications until the pressure of the nitrogen on the calibration pipeline is P sv And the value of the gas flowmeter is Q, and the capillary at the moment is the capillary which is finally calibrated.
The calibration method provided by the invention firstly obtains the valve step of the electronic expansion valve under the set refrigeration working condition and the refrigerant flow by operating the refrigeration unit, and then calibrates the capillary specification under the same flow characteristic by adopting a nitrogen measurement method, thereby realizing the calibration of the capillary specification when the refrigeration working condition or the refrigerant flow changes, improving the calibration accuracy, being simple and easy to implement, and being convenient for large-scale popularization and application.
Preferably, the condensation temperature in step (1) is adjusted by adjusting a variable frequency fan on the condenser to reach the set condensation temperature.
Preferably, the evaporation temperature in the step (1) is adjusted by adjusting an evaporation pressure adjusting valve so as to reach the set evaporation temperature.
Preferably, the refrigerant flow in step (1) is adjusted by adjusting the valve step of the electronic expansion valve to achieve the set refrigerant flow.
Preferably, the communication and the closing in the step (2) and the step (4) are respectively and independently operated by adjusting corresponding shut-off valves.
Preferably, the nitrogen pressure in step (3) is adjusted by adjusting the opening degree of a pressure reducing valve.
Preferably, the specification of the capillary tube in the step (5) comprises the diameter and/or length of the capillary tube.
Compared with the prior art, the invention has the following beneficial effects:
(1) The device system provided by the invention combines the refrigeration unit and the calibration unit, realizes the accurate calibration of the specification of the capillary tube under variable working conditions and variable flow rates by means of the switching between the electronic expansion valve and the capillary tube which are connected in parallel and the principle that the gas flow rates are the same under the same pressure difference according to the components with the same resistance characteristic, and further indicates the direction for designing and selecting the specification and the model of the capillary tube by customers;
(2) The calibration method provided by the invention firstly obtains the valve step of the electronic expansion valve under the set refrigeration working condition and the refrigerant flow by operating the refrigeration unit, and then calibrates the capillary specification under the same flow characteristic by adopting a nitrogen measurement method, thereby realizing the calibration of the capillary specification when the refrigeration working condition or the refrigerant flow changes, improving the calibration accuracy, being simple and easy to implement, and being convenient for large-scale popularization and application.
Drawings
FIG. 1 is a schematic structural diagram of a capillary tube calibrating device provided in embodiment 1;
fig. 2 is a schematic structural diagram of a capillary calibration device system provided in comparative example 1.
Wherein: 1-nitrogen gas cylinder; 2-a pressure reducing valve; 3-a pressure gauge; 301-high pressure gauge; 302-low pressure gauge; 4-closing the valve; 401-first shutoff valve; 402-a second shut-off valve; 403-third shutoff valve; 404-a fourth shutoff valve; 5-a quick coupling; 6-a capillary tube; 7-an electronic expansion valve; 8-a gas flow meter; 9-a compressor; 10-a temperature sensor; 11-a condenser; 12-a reservoir; 13-drying the filter; 14-liquid sight glass; 15-a liquid flow meter; 16-a first ball valve; 17-needle valves; 18-a second ball valve; 19-an evaporator; 20-a pressure sensor; 21-evaporation pressure regulating valve; 22-a check valve; 23-a gas-liquid separator; 24-a thermostatic expansion valve; 25-a hot gas bypass valve; 26-a first solenoid valve; 27-a second solenoid valve; 28-high pressure filling module; 29-low pressure filling module; 30-voltage controlled switching.
Detailed Description
The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a capillary tube calibration device system for variable working condition and variable flow, which comprises a refrigeration unit and a calibration unit; the refrigerating unit comprises 1 refrigerating cycle main path and 2 bypass branches, and the 2 bypass branches are respectively and independently connected in parallel on the refrigerating cycle main path.
As shown in fig. 1, a compressor 9, a temperature sensor 10, a condenser 11, an accumulator 12, a drying filter 13, a liquid viewing mirror 14, a liquid flow meter 15, a first ball valve 16, an electronic expansion valve 7, a second shut-off valve 402, a second ball valve 18, an evaporator 19, a pressure sensor 20, an evaporation pressure regulating valve 21, a check valve 22 and a gas-liquid separator 23 are sequentially arranged in series on the refrigeration cycle main circuit, and the gas-liquid separator 23 is connected back to the compressor 9; the condenser 11 is provided with a variable frequency fan.
Specifically, the 2 bypass branches include a first bypass branch and a second bypass branch. One end of the first bypass branch is arranged between the liquid observation mirror 14 and the liquid flowmeter 15, the other end of the first bypass branch is arranged between the check valve 22 and the gas-liquid separator 23, and the first solenoid valve 26 and the thermostatic expansion valve 24 are sequentially arranged on the first bypass branch in series; one end of the second bypass branch is arranged between the temperature sensor 10 and the condenser 11, the other end of the second bypass branch is arranged between the check valve 22 and the gas-liquid separator 23, and the second solenoid valve 27 and the hot gas bypass valve 25 are sequentially arranged on the second bypass branch in series.
In addition, a high-pressure filling module 28 is further arranged between the condenser 11 and the liquid reservoir 12, and the high-pressure filling module 28 includes a pressure-controlled switch 30, a high-pressure gauge 301 and a needle valve 17 (see fig. 1 for specific connection); a low-pressure filling module 29 is further arranged between the gas-liquid separator 23 and the compressor 9, and the low-pressure filling module 29 comprises a low-pressure gauge 302, a shut-off valve 4 and a needle valve 17 (see fig. 1 in particular).
In this embodiment, the calibration unit includes a nitrogen cylinder 1, a pressure reducing valve 2, a pressure gauge 3, a third shutoff valve 403, a needle valve 17, a first shutoff valve 401, a capillary tube 6, and quick connectors 5, a fourth shutoff valve 404 and a gas flowmeter 8 at two ends thereof, which are sequentially and serially arranged on the calibration pipeline.
The electronic expansion valve 7 on the main refrigeration cycle path is connected in parallel with the capillary tube 6 on the calibration pipeline, and the accurate calibration of the capillary tube specification under variable working conditions and variable flow can be realized by switching between the electronic expansion valve 7 and the capillary tube 6 which are connected in parallel and according to the principle that components with the same resistance characteristic pass through the same gas flow under the same pressure difference.
Comparative example 1
The comparative example provides a capillary tube calibration device system, as shown in fig. 2, the device system comprises a nitrogen cylinder 1, a pressure reducing valve 2, a pressure gauge 3, a calibration unit and a gas flowmeter 8 which are sequentially arranged on a calibration pipeline in series; the calibration unit comprises an electronic expansion valve 7 and a capillary tube 6 which are connected in parallel, the two ends of the electronic expansion valve 7 and the two ends of the capillary tube 6 are respectively provided with a quick connector 5, and a shut-off valve 4 is arranged on a branch path on one side close to the nitrogen cylinder 1.
Application example 1
The capillary tube calibration device system provided by the application example 1 of the application example calibrates the capillary tube, and the specific calibration method comprises the following steps:
(1) Opening the first ball valve 16, the second ball valve 18 and the second shut-off valve 402, operating the refrigeration unit, and adjusting the condensation temperature, the evaporation temperature and the refrigerant flow to set values respectively to obtain a valve step of the electronic expansion valve 7; the condensation temperature is adjusted by adjusting a variable frequency fan on the condenser 11 to reach a set condensation temperature; the evaporation temperature is adjusted by adjusting an evaporation pressure adjusting valve 21 to reach a set evaporation temperature; the refrigerant flow is adjusted by adjusting the valve step of the electronic expansion valve 7 to reach the set refrigerant flow;
(2) Stopping the operation of the refrigeration unit, closing the first ball valve 16 and the second ball valve 18, opening the third shut-off valve 403, the fourth shut-off valve 404 and the second shut-off valve 402, so that the parallel branch where the electronic expansion valve 7 is located is communicated with the calibration pipeline, and closing the parallel branch where the capillary 5 is located;
(3) Operating a calibration unit, keeping the valve step of the electronic expansion valve 7 obtained in the step (1) unchanged, and adjusting the nitrogen pressure on a calibration pipeline to the indication P of a pressure gauge 3 by adjusting the opening degree of a pressure reducing valve 2 sv Recording the gas flowThe value of the meter 8 is Q;
(4) Closing the second shut-off valve 402, opening the first shut-off valve 401, so that the parallel branch where the capillary tube 5 is located is communicated with the calibration pipeline, and closing the parallel branch where the electronic expansion valve 7 is located;
(5) Capillary tubes 6 with different diameters and lengths are adjusted through a quick connector 5 until the indication number of a pressure gauge 3 on the calibration pipeline is P sv And the value of the gas flowmeter 8 is Q, and the diameter and length corresponding to the capillary 6 at this time are the specifications of the final calibration capillary 6.
Comparative application example 1
The capillary tube calibration device system provided by the comparative example 1 is applied to the comparative application example to calibrate the capillary tube, and the specific calibration method comprises the following steps:
(1) The parallel branch where the electronic expansion valve 7 is located is communicated with the calibration pipeline by adjusting the corresponding shut-off valve 4, and the parallel branch where the capillary 5 is located is closed;
(2) Setting the valve step of the electronic expansion valve 7, adjusting the opening of the pressure reducing valve 2 to calibrate the nitrogen pressure on the pipeline until the reading of the pressure gauge 3 is P sv Recording the value of the gas flow meter 8 as Q;
(3) The parallel branch where the capillary tube 5 is positioned is communicated with the calibration pipeline by adjusting the corresponding shut-off valve 4, and the parallel branch where the electronic expansion valve 7 is positioned is closed;
(4) Capillary tubes 6 with different diameters and lengths are adjusted through a quick connector 5 until the indication number of a pressure gauge 3 on the calibration pipeline is P sv And the value of the gas flowmeter 8 is Q, and the diameter and length corresponding to the capillary 6 at this time are the specifications of the finally calibrated capillary 6.
Compared with the application example 1, the comparative application example can realize the calibration of the capillary tube, but is not suitable for the calibration under variable working conditions and variable flow, and the application scene is single.
Therefore, the device system provided by the invention combines the refrigeration unit and the calibration unit, realizes the accurate calibration of the capillary specification under variable working conditions and variable flow according to the principle that components with the same resistance characteristic pass through the same gas flow under the same pressure difference by means of the switching between the electronic expansion valve and the capillary which are connected in parallel, and further indicates the direction for designing and selecting the specification and the model of the capillary for customers.
In addition, the calibration method provided by the invention firstly obtains the valve step of the electronic expansion valve under the set refrigeration working condition and the refrigerant flow by operating the refrigeration unit, and then calibrates the capillary specification under the same flow characteristic by adopting a nitrogen measurement method, thereby realizing the calibration of the capillary specification when the refrigeration working condition or the refrigerant flow changes, improving the calibration accuracy, being simple and easy to implement, and being convenient for large-scale popularization and application.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. A capillary tube calibration device system aiming at variable working condition and variable flow is characterized by comprising a refrigeration unit and a calibration unit;
the refrigerating unit comprises 1 refrigerating cycle main path and 2 bypass branches, and the 2 bypass branches are respectively and independently connected to the refrigerating cycle main path in parallel;
a compressor, a condenser, an electronic expansion valve and an evaporator are sequentially and serially arranged on the refrigeration cycle main path;
the calibration unit comprises a nitrogen cylinder, a capillary tube and a gas flowmeter which are sequentially arranged on a calibration pipeline in series;
the electronic expansion valve on the main refrigeration cycle path is connected in parallel with the capillary tube on the calibration pipeline.
2. The capillary tube calibration device system according to claim 1, wherein a compressor, a condenser, a liquid reservoir, a liquid sight glass, a liquid flow meter, an electronic expansion valve, an evaporator, an evaporation pressure regulating valve and a gas-liquid separator are sequentially arranged in series on the refrigeration cycle main circuit, and the gas-liquid separator is connected with the compressor in a return manner;
and a variable frequency fan is arranged on the condenser.
3. The capillary tube calibration device system of claim 2, wherein the 2 bypass branches comprise a first bypass branch and a second bypass branch;
one end of the first bypass branch is arranged between the liquid sight glass and the liquid flowmeter, the other end of the first bypass branch is arranged between the evaporation pressure regulating valve and the gas-liquid separator, and the first solenoid valve and the thermostatic expansion valve are sequentially arranged on the first bypass branch in series;
one end of the second bypass branch is arranged between the compressor and the condenser, the other end of the second bypass branch is arranged between the evaporation pressure regulating valve and the gas-liquid separator, and the second electromagnetic valve and the hot gas bypass valve are sequentially arranged on the second bypass branch in series.
4. The capillary tube calibration device system according to claim 2, wherein a high-pressure filling module is further arranged between the condenser and the liquid reservoir, and the high-pressure filling module comprises a pressure-controlled switch, a high-pressure gauge and a needle valve;
still be provided with the low pressure between vapour and liquid separator and the compressor and fill the module, just the module is filled to the low pressure includes low-pressure table, shutoff valve and needle valve.
5. The capillary tube calibration device system as claimed in claim 2, wherein the refrigeration cycle main path is further provided with a temperature sensor, a dry filter, a ball valve, a shutoff valve, a pressure sensor and a check valve;
and the calibration pipeline is also provided with a pressure reducing valve, a pressure gauge, a shut-off valve, a needle valve and a quick connector.
6. A method for calibrating a capillary tube using the capillary tube calibration device system according to any one of claims 1-5, the method comprising the steps of:
(1) Operating the refrigeration unit, and respectively adjusting the refrigeration working condition and the refrigerant flow to set values to obtain a valve step of the electronic expansion valve; the refrigeration working condition comprises a condensation temperature and an evaporation temperature;
(2) Closing the refrigeration unit, communicating the parallel branch where the electronic expansion valve is located with the calibration pipeline, and closing the parallel branch where the capillary tube is located;
(3) Operating the calibration unit, keeping the valve step of the electronic expansion valve obtained in the step (1) unchanged, and adjusting the pressure of nitrogen on the calibration pipeline to P sv Recording the value of the gas flowmeter as Q;
(4) Communicating the parallel branch where the capillary tube is located with a calibration pipeline, and closing the parallel branch where the electronic expansion valve is located;
(5) Adjusting the capillary tubes with different specifications until the pressure of the nitrogen on the calibration pipeline is P sv And the value of the gas flowmeter is Q, and the capillary at the moment is the capillary which is finally calibrated.
7. The method of claim 6, wherein the condensing temperature of step (1) is adjusted by adjusting a variable frequency fan on the condenser to achieve a set condensing temperature;
the evaporation temperature in the step (1) is adjusted by adjusting an evaporation pressure adjusting valve so as to reach a set evaporation temperature;
and (2) adjusting the refrigerant flow in the step (1) by adjusting the valve step of the electronic expansion valve so as to achieve the set refrigerant flow.
8. The method of claim 6, wherein the communicating and closing of step (2) and step (4) are each independently operated by adjusting a corresponding shut-off valve.
9. The method according to claim 6, wherein the nitrogen pressure in step (3) is adjusted by adjusting the opening degree of a pressure reducing valve.
10. The method of claim 6, wherein the capillary gauge of step (5) comprises capillary diameter and/or length.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310478473.1A CN116499148A (en) | 2022-11-18 | 2022-11-18 | Capillary calibration device system and calibration method |
| CN202211442569.4A CN115574495B (en) | 2022-11-18 | 2022-11-18 | Capillary tube calibration device system and calibration method for variable working condition and variable flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211442569.4A CN115574495B (en) | 2022-11-18 | 2022-11-18 | Capillary tube calibration device system and calibration method for variable working condition and variable flow |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310478473.1A Division CN116499148A (en) | 2022-11-18 | 2022-11-18 | Capillary calibration device system and calibration method |
Publications (2)
| Publication Number | Publication Date |
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| CN115574495A true CN115574495A (en) | 2023-01-06 |
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| CN117338399A (en) * | 2023-12-01 | 2024-01-05 | 海杰亚（北京）医疗器械有限公司 | Phase separation control method and system for low-temperature ablation system |
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| CN115574495B (en) | 2023-05-26 |
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