CN116263610A - Liquid nitrogen and dry ice mixed temperature regulation control system and method for ultralow temperature processing - Google Patents
Liquid nitrogen and dry ice mixed temperature regulation control system and method for ultralow temperature processing Download PDFInfo
- Publication number
- CN116263610A CN116263610A CN202111516647.6A CN202111516647A CN116263610A CN 116263610 A CN116263610 A CN 116263610A CN 202111516647 A CN202111516647 A CN 202111516647A CN 116263610 A CN116263610 A CN 116263610A
- Authority
- CN
- China
- Prior art keywords
- temperature
- liquid nitrogen
- dry ice
- heat
- ball valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 116
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 58
- 239000007788 liquid Substances 0.000 title claims abstract description 57
- 235000011089 carbon dioxide Nutrition 0.000 title claims abstract description 56
- 238000012545 processing Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000007921 spray Substances 0.000 claims abstract description 10
- 238000009413 insulation Methods 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000008859 change Effects 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 238000005507 spraying Methods 0.000 claims 1
- 238000005520 cutting process Methods 0.000 abstract description 13
- 238000013461 design Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 9
- 238000001816 cooling Methods 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002173 cutting fluid Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
Abstract
The invention designs a liquid nitrogen and dry ice mixed temperature control system and method for ultralow temperature processing. The system comprises: the device comprises a liquid nitrogen pump, a liquid nitrogen tank, a dry ice pump, an adiabatic pipeline, a three-way mixing adiabatic chamber, an air storage chamber, a temperature measuring device, a spray head, a temperature control ball valve, a common ball valve, a check valve and a safety valve; according to the method, the opening and closing degree of the temperature control ball valve is controlled and changed by setting the target temperature according to an algorithm program, so that dry ice and liquid nitrogen are mixed at a specific flow to obtain a cold air flow with the target temperature, and finally the cold air flows through a spray head to be sprayed onto an ultralow-temperature cutting workpiece. According to the invention, the temperature is set by an algorithm program to control the opening and closing of the ball valve, so that cold air flow with accurate temperature is obtained, and accurate low-temperature processing in the ultralow-temperature cutting process is realized.
Description
Technical Field
The invention relates to a liquid nitrogen and dry ice mixed temperature regulation control system and method for ultralow temperature processing, which are used for achieving the purpose of obtaining cold air flow with set temperature by setting specific flow of liquid nitrogen and dry ice according to specific temperature.
Background
The ultra-low temperature cutting processing technology has become a very important technical means of the modern metal processing technology, and has more remarkable advantages than the traditional processing method in the aspect of processing difficult-to-process materials such as titanium alloy, high-temperature alloy and the like. The ultra-low temperature cutting technology can reduce abrasion by controlling the temperature of a cutting area, greatly prolong the service life of a cutter and improve the surface quality of a workpiece, and therefore, the technology has become one of the most favorable methods in the cutting processing of materials.
In practical application of ultra-low temperature processing technology, a liquid nitrogen cooling technology is most common, in future development of ultra-low temperature cutting technology, influences of a low temperature cooling environment on dynamic characteristics of a cutting area tool and a workpiece are studied in depth, and a cutting area dynamic characteristic change model is built so as to coordinate cooling parameters and optimal cutting parameters, so that the method is a problem to be solved urgently.
At present, research work on ultralow temperature cutting is still in an exploratory research stage, the technology of ultralow temperature cutting difficult-to-process materials is not perfect, and particularly, the research on the processing performance of gas jet flow in a low temperature range (-196 ℃ to-50 ℃) is still insufficient, and systematic research on ultralow temperature cooling cutting technology is still lacking, and the research on ultralow temperature control is still not deep enough. Therefore, a systematic and intensive study of ultra-low temperature process temperature control is necessary.
Disclosure of Invention
In order to solve the problems, the invention provides a liquid nitrogen and dry ice mixed temperature control system and method for ultra-low temperature processing.
The invention relates to a liquid nitrogen and dry ice mixed temperature regulation control system for ultralow temperature processing, which comprises a liquid nitrogen pump, a liquid nitrogen tank, a dry ice pump, an adiabatic pipeline, a three-way mixed adiabatic chamber, an air storage chamber, a spray head, a temperature measuring device, a temperature control ball valve, a common ball valve, a check valve and a safety valve; wherein: the liquid nitrogen pump pumps out liquid nitrogen from the tank body; a liquid nitrogen tank for storing and outputting liquid nitrogen at-196 ℃; a dry ice pump for pumping dry ice particles out of the tank; a dry ice tank for storing and transporting dry ice particles at-75 ℃; the three-channel mixed heat-insulating chamber and the heat-insulating container mixed by liquid nitrogen and dry ice are communicated with the outside through three pipelines, and a filter screen is arranged in the heat-insulating container, so that dry ice particles are prevented from entering the heat-insulating pipeline to be adhered and become large to block the pipeline; the air storage chamber is connected with the three-channel mixed heat-insulating chamber and used for storing and conveying mixed cold air flow; a spray head for releasing the cold air flow; the temperature measuring device is used for measuring and displaying the temperature of the three-channel mixed heat-insulating chamber and the temperature of the air storage chamber in real time; the temperature control ball valve is input to control the opening and closing of the ball valve, and the flow of liquid nitrogen and dry ice is changed; a common ball valve controls the transmission speed of cold air flow into the air storage chamber; a check valve controlling one-way transfer of the air flow; the heat-insulating pipeline ensures the heat-insulating conveying environment; the safety valve ensures that the air pressure of the three-channel mixed heat-insulating chamber and the air storage chamber is lower than the maximum air pressure value. The heat insulation pipeline is connected with the inlet of the three-channel mixing heat insulation chamber by adopting a flange. The temperature control ball valve is provided with a control panel, and the input temperature can obtain corresponding flow data and control the opening and closing of the temperature control ball valve.
The invention relates to a liquid nitrogen and dry ice mixed temperature regulation control method for ultralow temperature processing, which adopts a design algorithm program, inputs a set temperature, controls the opening and closing of a temperature control ball valve to control the flow rate when liquid nitrogen and dry ice are mixed, ensures that the temperature of cold air flow reaches the input temperature after mixing, and finally sprays cold air from a spray head after flowing through a conveying pipeline. The temperature control algorithm program establishes a functional relation between the temperature and the flow rate and effectively controls the temperature of the cold air flow; the temperature control algorithm program is as follows:
wherein,,
gamma is the latent heat of vaporization of liquid nitrogen: 217 kJ/kg;
ρ 1 is the density of nitrogen;
c 1 is the specific heat capacity of nitrogen;
t is the target temperature;
c 2 specific heat capacity of dry ice particles;
m2 is the mass of dry ice particles.
The innovative principle of the invention is that liquid nitrogen is used as a cooling medium, dry ice is used as a temperature regulating medium, the flow rates of the liquid nitrogen and the dry ice are controlled to control the temperature of cold air flow, and the temperature regulating range of the liquid nitrogen is enlarged, so that cooling liquids with different temperatures are used for different materials.
The invention has the following advantages:
(1) The invention adopts the mode of controlling the mixed flow by the temperature control ball valve to control the temperature of the cold air flow, can realize multi-gradient flexible temperature adjustment, and simultaneously establishes a numerical relation between the liquid nitrogen flow and the dry ice flow, thereby ensuring the accuracy of controlling the temperature and realizing accurate control.
(2) The cooling medium of the invention is dry ice (solid carbon dioxide), liquid nitrogen and air which are nontoxic gases at normal temperature, so that pollution is not needed to be considered, and the invention is beneficial to environmental protection.
(3) The invention considers the problem that dry ice particles block the pipeline when encountering cold, and ensures the system rigor.
(4) The invention adopts the adiabatic environment, so that the temperature of the box body is not influenced by the external environment, and the stability of the temperature is ensured.
(5) The invention adopts temperature setting input and real-time monitoring of temperature measurement, and has good man-machine interaction.
Drawings
In order to more clearly illustrate the technical solutions of the examples or the prior art of the present application, the following description of the examples or the prior art of the present application refers to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a liquid nitrogen and dry ice mixed temperature control system for ultra-low temperature processing.
FIG. 2 is a flow chart of the present invention for ultra-low temperature process attemperation.
FIG. 3 is a schematic diagram of a liquid nitrogen end, dry ice end temperature control ball valve control panel.
Fig. 4 is a schematic diagram of a three-way hybrid thermal insulation chamber.
Detailed Description
The specific construction and method of operation of the present invention will be described in detail with reference to the accompanying drawings.
A liquid nitrogen and dry ice mixed temperature regulation control system for ultra-low temperature processing is shown in fig. 1, and comprises: the device comprises a liquid nitrogen pump 1, a liquid nitrogen tank 2, a dry ice pump 3, a dry ice tank 4, a 5 heat insulation pipeline, a 6 temperature control ball valve a, a 7 check valve a, an 8-three-way mixed heat insulation chamber, a 9 safety valve a, a 10 check valve b, an 11 temperature control ball valve b, a 12 temperature measuring device a, a 13 temperature measuring device b, a 14 check valve c, a 15 common ball valve, a 16 safety valve b, a 17 air storage chamber and an 18 spray head.
Bonding ofThe invention is described in the specific case where the model of the liquid nitrogen pump is MDZ-10 and the flow regulation and control range is 15-80 m 3 /h; the model of the liquid nitrogen tank is YDZ-110, the empty weight is 68kg, the nominal volume is 110L, and the actual volume is 100L; the dry ice pump is MEF40-3, and the flow range is 1-120 m 3 /h; the model of the dry ice tank is YDZ-110, the empty weight is 68kg, the nominal volume is 110L, and the actual volume is 100L; the volume of the three-channel mixed heat-insulating chamber is 30L, the length and width are 300 multiplied by 200 multiplied by 500, and the three extended pipelines are connected with the heat-insulating pipeline through flanges; the specific size of the air storage chamber is the same as that of the three-way mixed heat-insulating chamber; the heat insulation pipeline adopts a Clay static vacuum heat insulation hose which is connected with an inlet of the three-way mixed heat insulation chamber by a flange.
The liquid nitrogen and dry ice mixed temperature regulation control system for ultra-low temperature processing specifically comprises the following operation processes: when the set temperature is minus 150 ℃, firstly inputting minus 150 ℃ into two temperature control ball valve control panels, starting a liquid nitrogen pump and a dry ice pump, and opening all valves, wherein the flow of the control panels is 0.05m of liquid nitrogen flow 3 And (3) pre-cooling the whole system at the dry ice flow rate of 68.48kg/h, closing a liquid nitrogen pump and a dry ice pump when the temperatures of the three-channel mixed heat-insulating chamber and the air storage chamber are consistent, closing a common ball valve and a check valve c when the cold air flow is completely output, and finishing pre-cooling. And (3) opening a liquid nitrogen pump and a dry ice pump, keeping the temperature input of a temperature control ball valve control panel at-150 ℃, continuously pumping liquid nitrogen and dry ice into a three-way mixed heat-insulating chamber for the panel flow number, opening a common ball valve and a check valve c after the temperature measuring device stably displays the temperature of-150 ℃, and controlling the air flow jet speed of a spray head according to the processing requirement when cold air flows into the air storage chamber.
In summary, according to the liquid nitrogen and dry ice mixed temperature regulation control system for ultralow temperature processing, through a design algorithm program, a set temperature is input, the opening and closing of the temperature control ball valve are controlled to control the flow rate when liquid nitrogen and dry ice are mixed, and finally, the cold air flow is output at the set temperature, so that the temperature of the liquid nitrogen and dry ice cold air flow is accurately controlled, and the stability of the cutting fluid temperature is ensured.
It will be understood that the invention has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (4)
1. The liquid nitrogen and dry ice mixed temperature regulation control system for ultralow temperature processing is characterized by comprising the following components: liquid nitrogen supply device, dry ice supply device, three-way mixing heat insulation room, gas receiver, shower nozzle, temperature measuring device, control by temperature change ball valve, check valve, ordinary ball valve, relief valve, adiabatic pipeline, wherein: the liquid nitrogen pump pumps out liquid nitrogen from the tank body; a liquid nitrogen tank for storing and outputting liquid nitrogen at-196 ℃; a dry ice pump for pumping dry ice particles out of the tank; a dry ice tank for storing and transporting dry ice particles at-75 ℃; the three-channel mixed heat-insulating chamber and the heat-insulating container mixed by liquid nitrogen and dry ice are communicated with the outside through three pipelines, and a filter screen is arranged in the heat-insulating container, so that dry ice particles are prevented from entering the heat-insulating pipeline to be adhered and become large to block the pipeline; the air storage chamber is connected with the three-channel mixed heat-insulating chamber and used for storing and conveying mixed cold air flow; a spray head for releasing the cold air flow; the temperature measuring device is used for measuring and displaying the temperature of the three-channel mixed heat-insulating chamber and the temperature of the air storage chamber in real time; the temperature control ball valve is provided with a control panel, corresponding flow data can be obtained by inputting temperature, the opening and closing of the temperature control ball valve are controlled, and the flow of liquid nitrogen and dry ice is changed; a check valve controlling one-way transfer of the air flow; a common ball valve controls the transmission speed of cold air flow into the air storage chamber; the safety valve ensures that the air pressure of the three-channel mixed heat-insulating chamber and the air storage chamber is lower than the maximum air pressure value; the heat insulation pipeline ensures the heat insulation conveying environment, and the inlets of the three-channel mixing heat insulation chamber are connected by adopting flanges.
2. The ultra-low temperature processing liquid nitrogen and dry ice mixing temperature control system according to claim 1, wherein: the inlet of the first channel of the three-channel mixed heat-insulating chamber is connected with the outlet of the liquid nitrogen supply device through a heat-insulating pipeline, the inlet of the second channel of the three-channel mixed heat-insulating chamber is connected with the outlet of the dry ice supply device, the outlet of the third channel of the three-channel mixed heat-insulating chamber is connected with the inlet of the first channel of the air storage chamber through a heat-insulating pipeline, and check valves are arranged on all the channels to ensure the unidirectional flow of cold air flow.
3. A method for controlling the temp regulation of the mixture of liquid nitrogen and dry ice includes such steps as inputting a set temp, controlling the opening and closing of temp-controlled ball valve to control the flow rate of liquid nitrogen and dry ice, ensuring the temp of cold air to reach the input temp, and spraying the cold air from spray head.
4. The method for controlling the mixed temperature of liquid nitrogen and dry ice for ultralow temperature processing according to claim 3, wherein the temperature control algorithm program is used for establishing a functional relation between temperature and flow rate and effectively controlling the temperature of cold air flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111516647.6A CN116263610A (en) | 2021-12-13 | 2021-12-13 | Liquid nitrogen and dry ice mixed temperature regulation control system and method for ultralow temperature processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111516647.6A CN116263610A (en) | 2021-12-13 | 2021-12-13 | Liquid nitrogen and dry ice mixed temperature regulation control system and method for ultralow temperature processing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116263610A true CN116263610A (en) | 2023-06-16 |
Family
ID=86723263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111516647.6A Pending CN116263610A (en) | 2021-12-13 | 2021-12-13 | Liquid nitrogen and dry ice mixed temperature regulation control system and method for ultralow temperature processing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116263610A (en) |
-
2021
- 2021-12-13 CN CN202111516647.6A patent/CN116263610A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106425887B (en) | A kind of forward and backward hybrid ice pellets gas jet device and method | |
| CN108568700A (en) | A kind of metal cutting process low-temperature carbon dioxide cooling and lubricating system | |
| CN213936113U (en) | Gas supply system of plasma processing device | |
| CN112129136A (en) | Low-temperature cold air generating device capable of stabilizing temperature and pressure and control method | |
| CN207081255U (en) | Cryogenic treatment device | |
| CN116263610A (en) | Liquid nitrogen and dry ice mixed temperature regulation control system and method for ultralow temperature processing | |
| JP2006062024A (en) | Mist generation device | |
| JP5184300B2 (en) | Dry ice manufacturing apparatus and dry ice manufacturing method | |
| CN103983067B (en) | Intelligence liquid nitrogen freezers and control method | |
| CN100462652C (en) | Ice crystal granule gas generation device | |
| CN105823282A (en) | Discharge pressure control method used for optimized operation of carbon dioxide heat pump system | |
| CN107388032A (en) | A kind of regulation and control method of the in stable condition flow of liquid nitrogen injection | |
| CN105583689A (en) | Double-sprayer type liquid nitrogen cooling system suitable for Inconel 718 cutting machining | |
| CN107388882A (en) | The multi fan of cooling tower sprays collaboration fuzzy control method more | |
| CN101632974A (en) | Long-size spray painting pipeline pressure stabilization device without voltage stabilizer | |
| CN203785306U (en) | Special water cooler for carbon dioxide laser | |
| CN107345729A (en) | Cryogenic treatment device | |
| CN208681138U (en) | A kind of metal cutting process low-temperature carbon dioxide cooling and lubricating system | |
| CN108240318A (en) | Cryogenic jet pump platform | |
| CN109333144B (en) | Supercritical carbon dioxide transmission process | |
| CN211992091U (en) | Numerical control lathe cutter cooling device | |
| EP3127433A1 (en) | Apparatus and method for providing liquid-gas entrained cryogen mixture | |
| CN207081256U (en) | Cryogenic treatment device | |
| CN107345730A (en) | Cryogenic treatment device | |
| CN203928543U (en) | Intelligence liquid nitrogen frozen machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |