CN110529730A - It is a kind of to supply to give regulation device towards the cooling free-standing liquid nitrogen processed of ultralow temperature - Google Patents

It is a kind of to supply to give regulation device towards the cooling free-standing liquid nitrogen processed of ultralow temperature Download PDF

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Publication number
CN110529730A
CN110529730A CN201910800798.0A CN201910800798A CN110529730A CN 110529730 A CN110529730 A CN 110529730A CN 201910800798 A CN201910800798 A CN 201910800798A CN 110529730 A CN110529730 A CN 110529730A
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China
Prior art keywords
liquid nitrogen
pressure
valve
temperature
hard tube
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Withdrawn
Application number
CN201910800798.0A
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Chinese (zh)
Inventor
王永青
韩灵生
刘阔
孔繁泽
刘海波
刘树源
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Dalian University of Technology
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Dalian University of Technology
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Priority to CN201910800798.0A priority Critical patent/CN110529730A/en
Priority to PCT/CN2019/105935 priority patent/WO2021035824A1/en
Publication of CN110529730A publication Critical patent/CN110529730A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/10—Arrangements for cooling or lubricating tools or work
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/08—Mounting arrangements for vessels
    • F17C13/084—Mounting arrangements for vessels for small-sized storage vessels, e.g. compressed gas cylinders or bottles, disposable gas vessels, vessels adapted for automotive use
    • F17C13/085—Mounting arrangements for vessels for small-sized storage vessels, e.g. compressed gas cylinders or bottles, disposable gas vessels, vessels adapted for automotive use on wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0325—Aerogel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0329—Foam
    • F17C2203/0333—Polyurethane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0153—Details of mounting arrangements
    • F17C2205/0157—Details of mounting arrangements for transport
    • F17C2205/0161—Details of mounting arrangements for transport with wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0332—Safety valves or pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0146—Two-phase
    • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/043—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0439—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0443—Flow or movement of content
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/05—Applications for industrial use

Abstract

The invention belongs to low temperature processing techniques fields, a kind of free-standing liquid nitrogen towards the cooling processing of ultralow temperature is provided for giving regulation device, including liquid nitrogen supply transmission unit, sensing execution unit and control unit, the stable regulation of liquid nitrogen pressure, flow, temperature in the cooling processing of ultralow temperature is realized.Regulation device arrival end installs pressure reducing valve, realizes the stability contorting of liquid nitrogen transmission pressure；Using the coriolis force flowmeter of resistance to ultralow temperature, liquid nitrogen mass flow and hybrid density are accurately measured, realizes the real time discriminating of gas phase ratio and monitoring in pipeline；Pass through the detection units such as flowmeter, liquidometer, pressure sensor, temperature sensor, the execution units such as regulating valve, pressure reducing valve, and the control units such as industrial plate, data collecting card, realize that liquid nitrogen pressure, flow, temperature, density, the real-time monitoring of the states such as reserves and pressure, flow, temperature jointly control；The removable design of stand-alone device provides support for the cooling processing of ultralow temperature of machine tool.

Description

It is a kind of to supply to give regulation device towards the cooling free-standing liquid nitrogen processed of ultralow temperature
Technical field
The invention belongs to low temperature processing techniques fields, and in particular to a kind of free-standing liquid nitrogen towards the cooling processing of ultralow temperature For giving regulation device.
Background technique
Take liquid nitrogen (- 196 DEG C of saturation temperature) as the ultralow warm working of cooling medium, cutting temperature can be greatly reduced, mentioning The processing quality and processing efficiency of high difficult-to-machine material part extend cutter life etc. with unique advantage.In recent years, liquid The sustainable supply of the cooling mediums such as nitrogen, stable transmission are received significant attention with reliable control technique.
The confession of cooling medium gives the premise and guarantee that reliable regulation is the cooling processing and implementation of ultralow temperature.Due to being processed zero The material and structure of part have diversity, therefore it is required that ultralow temperature medium has multivariable, a wide range of, quantitative ability of regulation and control. For example, design feature of the Milling Process of narrow slot due to its big depth-to-width ratio, needs higher jet pressure just and can guarantee that liquid nitrogen is suitable Benefit enters cutting zone, implements effectively cooling；The materials such as stainless steel can lead to Surface hardened layer after subzero treatment, so ultralow Control liquid nitrogen flow is required when temperature cooling processing, avoids the hardness for increasing green surface, thus aggravate tool wear, same to time control Liquid nitrogen flow processed can also improve the utilization rate of cooling medium, avoid wasting.But liquid nitrogen is since saturation temperature is low, gasification latent heat It is small, it is influenced, is easily vaporized, vaporization phenomenon can seriously destroy liquid nitrogen by ambient temperature with transmission process in storage The stability of transmission, to increase the regulation difficulty of pressure, flow and temperature.The above problem is to liquid nitrogen for giving regulation dress The real-time monitoring of heat-insulating capability, transmission stability, sensor lower temperature resistance and the status information set and control etc. propose very high Requirement.
Currently, mechanism is for the ultralow temperature cooling medium such as liquid nitrogen both at home and abroad, research and development various flow rate regulator control system With device.2017, Dalian University of Technology disclosed that " a kind of liquid nitrogen injection state is steady in patent of invention 201710535356.9 The regulation method of constant flow ", this method is heat-insulated using vacuum line, by flowmeter real-time monitoring liquid nitrogen flow, is calculated using PID Method realizes that flow is adjusted, but is not directed to the regulation of liquid nitrogen pressure.2017, the Central China University of Science and Technology was in patent of invention " a kind of difficult-to-machine material deep cooling system of processing for automating liquid nitrogen flow control ", the system are disclosed in 201710099659.0 The automation flow control of liquid nitrogen is realized by ullage atmospheric pressure value in gas-liquid phase separator is actively adjusted, but not to liquid nitrogen Output pressure and temperature regulated and controled, and system is complex.2018, University Of Ji'nan was in patent of invention " a kind of liquid nitrogen flow intelligent control cooling system suitable for sub-zero machining " is disclosed in 201811181076.3, which adopts With the forward and backward knife face temperature of infrared radiation thermometer on-line checking and processor is fed back to, by flowmeter and regulating valve to liquid nitrogen flow It is controlled, is finally reached set temperature, but be not directed to stablizing for liquid nitrogen pressure and regulate and control.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, it is cooling towards ultralow temperature that the invention proposes one kind by the present invention The free-standing liquid nitrogen of processing realizes that liquid nitrogen pressure, flow, stablizing for temperature are adjusted in the cooling processing of ultralow temperature for giving regulation device Control.The device includes liquid nitrogen storage tank and regulation device, realizes that the confession of liquid nitrogen gives regulation；Using vacuum line and cold insulation measure, Weaken liquid nitrogen gasification caused by pipeline leakage heat to the maximum extent；Regulation device arrival end installs pressure reducing valve, realizes liquid nitrogen transmission pressure The stability contorting of power；Using the coriolis force flowmeter of resistance to ultralow temperature, liquid nitrogen mass flow and hybrid density are accurately measured, realizes pipe The real time discriminating of gas phase ratio and monitoring in road；Pass through the detections list such as flowmeter, liquidometer, pressure sensor, temperature sensor Member, the control units such as the execution units such as regulating valve, pressure reducing valve, and industrial plate, data collecting card, realizes liquid nitrogen multimode (pressure, flow, temperature, density, reserves) real-time monitoring and pressure, flow, temperature control；It is dynamic that the design of the device meets fluid The requirement of mechanics scheduling theory, compact-sized, connection and reasonable arrangement is small as stand-alone system occupied area, conveniently moving.
Technical solution of the present invention:
A kind of free-standing liquid nitrogen towards the cooling processing of ultralow temperature is for giving regulation device, including liquid nitrogen supply transmission is single Member, sensing execution unit and control unit, wherein liquid nitrogen supply transmission unit includes liquid nitrogen source and transfer conduit；Sensing executes list Member includes various kinds of sensors and valve element, is responsible for liquid nitrogen state-detection and adjusts；Control unit is mainly by controller and data Transmission module composition, the acquisition and operation of responsible data and status information show and transmit with order；
The liquid nitrogen supply transmission unit includes trolley 1.1, liquid nitrogen storage tank 1.2, shut-off valve 1.3, arrival end vacuum Hose 1.6, vacuum hard tube 1.7, hard tube 1, hard tube 2 1.9, hard tube 3 1.10, outlet end vacuum hose 1.11 and nozzle 1.12；Liquid nitrogen storage tank 1.2 is placed on trolley 1.1, is moved easily；Control liquid nitrogen liquid in-out is equipped at the top of liquid nitrogen storage tank 1.2 Shut-off valve 1.3 and detection liquid nitrogen reserves liquidometer 1.4；Liquid nitrogen storage tank 1.2 passes through connector 1.5 and arrival end vacuum hose 1.6 connections, arrival end vacuum hose 1.6 are connect with vacuum hard tube 1.7 by one 1.a of flange, wherein 1.7 other end of vacuum hard tube Inside control cabinet 2.1, apart from 1/3 that bottom of cabinet is cabinet height on vertical direction；Inside control cabinet 2.1, vacuum hard tube 1.7 are connect with pressure reducing valve 2.2 by two 1.b of flange, guarantee that pressure reducing valve 2.2 is vertically-mounted；2.2 other end of pressure reducing valve and hard tube one 1.8, by three 1.c connection of flange, drill at one 1.8 middle part of hard tube and the measurement end of inlet pressure transducer 2.3 are protruded into pipe It is interior, then hole is shut；One 1.8 other end of hard tube is connect by four 1.d of flange with flowmeter 2.4, guarantees that flowmeter 2.4 is vertical Installation；2.4 other end of flowmeter is connect with hard tube 2 1.9 by five 1.e of flange, is drilled on hard tube 2 1.9 and is installed safety Valve 2.5；2.6 one end of electric control valve is connect by six 1.f of flange with hard tube 2 1.9, and the other end passes through seven 1.g of flange and hard tube 3 1.10 connections, electric control valve 2.6 is vertically-mounted and is fixed on control cabinet 2.1 by two bolt 1.i；In hard tube 3 1.10 On drill two holes at a certain distance, successively the measurement end of temperature sensor 2.7 and outlet pressure sensor 2.8 is protruded into pipe, Then hole is shut；Hard tube 3 1.10 is connect by eight 1.h of flange with outlet end vacuum hose 1.11；Outlet end vacuum hose 1.11 ends nozzle 1.12 is installed using thread connecting mode；All pipeline guarantees are horizontally mounted in addition to hose, among flange Faying face all uses teflon gasket to seal；Heat-insulated processing is made to the horizontal pipeline in control cabinet 2.1, forms Cold-keeping Layer 2.9, to reduce the gasification in liquid nitrogen transmission process and guarantee the stability of pressure, flow and temperature；Cold-keeping Layer 2.9 is bilayer Structure, first layer are that the airsetting rubber mat covered is twined outside pipeline, and the second layer is filled between the shell and airsetting rubber mat of Cold-keeping Layer 2.9 Polyurethane foam；
The sensing execution unit includes liquidometer 1.4, flowmeter 2.4, safety valve 2.5, inlet pressure transducer 2.3, outlet pressure sensor 2.8, temperature sensor 2.7, pressure reducing valve 2.2 and electric control valve 2.6；
The control unit is adopted including industrial plate 3.1,24V power supply 3.2, relay 3.3, A/D capture card 3.4, D/A Truck 3.5, start button 3.6 and close key 3.7；Control unit is mounted on the upper right side region of control cabinet 2.1, in control unit It is connected between portion, control unit and sensing execution unit using conducting wire；Start button 3.6 and close key 3.7 respectively with relay 3.3 Connection controls the on-off of 220V circuit；Relay 3.3 connects with industrial plate 3.1,24V power supply 3.2, electric control valve 2.6 respectively It connects, provides 220V power supply for it；24V power supply 3.2 and liquidometer 1.4, flowmeter 2.4, temperature sensor 2.7, inlet pressure pass Sensor 2.3, outlet pressure sensor 2.8, pressure reducing valve 2.2, A/D capture card 3.4 and D/A capture card 3.5 connect, and supply for it Electricity；Industrial plate 3.1 is connect with A/D capture card 3.4 and D/A capture card 3.5；Liquidometer 1.4 is by the liquid nitrogen in liquid nitrogen storage tank 1.2 Reserves are converted into analog signals in real time, are converted into digital quantity signal by A/D capture card 3.4 and are transmitted to industrial plate 3.1；It is logical Cross identical mode, flowmeter 2.4 is by liquid nitrogen flow and hybrid density real-time Transmission to industrial plate 3.1, temperature sensor 2.7 Liquid nitrogen real time temperature is transmitted to industrial plate 3.1, the real-time input pressure of liquid nitrogen is transmitted to industry by inlet pressure transducer 2.3 The real-time output pressure of liquid nitrogen is transmitted to industrial plate 3.1 by plate 3.1, outlet pressure sensor 2.8；Industrial plate 3.1 is realized The real-time processing of data and the real-time display of numerical value and change curve, while setting entrance can be inputted in industrial plate 3.1 Pressure value and valve port opening value are converted into analog quantity by D/A capture card 3.5, and analog quantity are transmitted to pressure reducing valve 2.2 and electricity Dynamic regulating valve 2.6, realizes the adjusting of liquid nitrogen pressure, flow and temperature；Pressure reducing valve 2.2 is in addition to adjusting liquid nitrogen pressure, moreover it is possible to play The effect of steady pressure；The relationship of the valve port opening value h and liquid nitrogen flow q of electric control valve 2.6 are as follows:
In formula, KvsFor regulating valve rated flow coefficient, S is the density ratio of liquid nitrogen and water, and Δ P is pressure before and after regulating valve Difference；
Implement liquid nitrogen for pressing start button 3.6 first, it is ensured that regulation device works on power, then will be electric when giving regulation The valve port opening value of dynamic regulating valve 2.6 is transferred to maximum, guarantees to reduce pipeline pre-coo time while transfer conduit is unimpeded, twist later The shut-off valve 1.3 on liquid nitrogen storage tank 1.2 is opened, liquid nitrogen is sprayed from nozzle 1.12 by pipeline；Observe the reality in industrial plate 3.1 When monitoring data, wait liquid nitrogen temperature be reduced to -170 DEG C or less and it is basicly stable after, control pressure reducing valve 2.2 and electric control valve 2.6, realize that the adjusting of liquid nitrogen pressure and flow, the at this time regulation of liquid nitrogen temperature can be realized by adjusting flow；Ultra-low temperature cold But after processing is completed, it is first shut off shut-off valve 1.3, then presses close key 3.7, it is ensured that is electric under regulation device.
The beneficial effects of the invention are as follows transfer conduits to use the compound cold insulation knot of the gentle gel mat-polyurethane foam of vacuum structure Structure prevents ambient temperature heat transfer from causing liquid nitrogen gasification, guarantees the low mass dryness fraction of liquid nitrogen, high stable transmission；Liquid nitrogen storage tank and regulation Pressure reducing valve is installed between device, solves the problems, such as pressure transient when liquid nitrogen is exported out of storage tank, transmits pressure for liquid nitrogen Stability contorting lays the foundation；Using the coriolis force flowmeter of resistance to ultralow temperature, solves liquid nitrogen because gasification causes flow measurement inaccurate The problem of, while realizing the real-time monitoring of liquid nitrogen gasification ratio in pipeline, for pressure, flow or heat insulation structural adjustment provide according to According to；Monitoring interface can show that liquid nitrogen temperature, flow, inlet pressure, outlet pressure, reserves is real-time in hybrid density and tank simultaneously Numerical value and temperature, flow, outlet pressure real-time change curve, realize liquid nitrogen for give transmission state comprehensive monitoring with Regulation；The device has the advantages that compact-sized, connection and reasonable arrangement, occupied area be small, conveniently moving.
Detailed description of the invention
Fig. 1 is that liquid nitrogen supplies to give the structural schematic diagram of regulation device；
Fig. 2 is the circuit connection diagram for sensing execution unit and control unit；
Fig. 3 is regulation software interface schematic diagram；
Fig. 4 is liquid nitrogen temperature real-time change curve；
Fig. 5 is liquid nitrogen outlet pressure real-time change curve；
Fig. 6 is liquid nitrogen flow real-time change curve.
In figure: 1.1- trolley；1.2- liquid nitrogen storage tank；1.3- shut-off valve；1.4- liquidometer；1.5- connector；1.6- entrance Hold vacuum hose；1.7- vacuum hard tube；1.8- hard tube one；1.9- hard tube two；1.10- hard tube three；The outlet end 1.11- vacuum is soft Pipe；1.12- nozzle；1.a- flange one；1.b- flange two；1.c- flange three；1.d- flange four；1.e- flange five；1.f- flange Six；1.g- flange seven；1.h- flange eight；1.i- bolt；2.1- control cabinet；2.2- pressure reducing valve；2.3- inlet pressure transducer； 2.4- flowmeter；2.5- safety valve；2.6- electric control valve；2.7- temperature sensor；2.8- outlet pressure sensor；2.9- protecting Cooling layer；3.1- industry plate；3.2-24V power supply；3.3- relay；3.4-A/D capture card；3.5-D/A capture card；3.6- opening Key；3.7- close key.
Specific embodiment
With reference to the accompanying drawing and technical solution, the specific embodiment that the present invention will be described in detail.
In the present embodiment, liquid nitrogen storage tank 1.2 is DPL high pressure series Dewar tank, nominal pressure 2.3MPa, maximum filling liquid Quality is 133kg (dischargeable capacity 165L), outer dimension isThe liquid nitrogen exported in liquid nitrogen storage tank 1.2 Temperature is -196 DEG C；The maximum load of trolley 1.1 is 300kg；The display range of liquidometer 1.4 is 0~165L；Arrival end is true The internal diameter of empty hose 1.6 and outlet end vacuum hose 1.11 is 5mm, outer diameter 40mm；Vacuum hard tube 1.7 and hard tube 1 etc. The inside and outside diameter of hard tube is 5mm and 35mm, and material is 304 stainless steels；1.12 internal diameter of nozzle is 2mm；The length, width and height of control cabinet 2.1 For 1100 × 570 × 1280mm；The working range of pressure reducing valve 2.2 is 0.1~1.6MPa；The pressure release threshold value of safety valve 2.5 is 1.8MPa；The range of flowmeter 2.4 is 0~81kg/h, and measurement accuracy is ± 0.1%FS, medium temperature range -200~350 ℃；The range of inlet pressure transducer 2.3 and outlet pressure sensor 2.8 is 0~1.6MPa, and measurement accuracy is ± 0.5%FS； The range of temperature sensor 2.7 is -200~50 DEG C；The adjustable range of electric control valve 2.6 is 0~100kg/h, metered flow COEFFICIENT KvsIt is 0.12；The sensor output is 4~20mA signal with actuator input；2.9 shell of Cold-keeping Layer is stainless steel Material, radius 100mm, aeroge mat thickness are 10mm, and thermal coefficient is 0.009W/ (mK), and polyurethane foam is thermally conductive Coefficient is 0.02W/ (mK)；Industrial 3.1 model IPPC-6172A of plate；A/D capture card 3.4 is the input of 16 tunnels, D/A acquisition Card 3.5 exports for 8 tunnels.
Free-standing liquid nitrogen is as follows for giving regulation device installation process: as shown in Figure 1, 2, the first step will be filled with liquid nitrogen Liquid nitrogen storage tank 1.2 is placed on trolley 1.1, with connector 1.5 by 1.2 liquid in-out mouth of liquid nitrogen storage tank and arrival end vacuum hose 1.6 end of thread connection, and sealed with unsintered tape；
Second step, inside control cabinet 2.1 by from the sequence turned left of the right side successively install vacuum hard tube 1.7, pressure reducing valve 2.2, Hard tube 1, flowmeter 2.4, hard tube 2 1.9, electric control valve 2.6 and hard tube 3 1.10, wherein vacuum hard tube 1.7 and hard tube 3 1.10 free end is stretched out outside control cabinet 2.1, and pressure reducing valve 2.2 and electric control valve 2.6 guarantee vertically-mounted；Between any two Connection type is flanged joint, be followed successively by two 1.b of flange, three 1.c of flange, four 1.d of flange, five 1.e of flange, six 1.f of flange and Seven 1.g of flange is sealed using teflon gasket among flange, and guarantees pipeline level, then will using two bolt 1.i Electric control valve 2.6 and control cabinet 2.1 are fixed；Finally by one 1.a of flange by the flange end of arrival end vacuum hose 1.6 and very The outer end of empty hard tube 1.7 is connected, by eight 1.h of flange by the flange of the outer end of hard tube 3 1.10 and outlet end vacuum hose 1.11 End is connected, and nozzle 1.12 is mounted on to the end of outlet end vacuum hose 1.11 using thread connecting mode；
Third step protrudes into the measurement end of inlet pressure transducer 2.3 in the pre-drilled hole of hard tube 1, then will It shuts in hole；Equally, safety valve 2.5 is mounted in the outer cinclides of hard tube 2 1.9, is turned left sequentially from the right side by 2.7 He of temperature sensor The measurement end of outlet pressure sensor 2.8 protrudes into the hole of hard tube 3 1.10, then shuts hole；Pipeline and sensing execute member After part is installed and ensures No leakage, the gas for covering 10mm thickness is twined in hard tube 1, hard tube 2 1.9 and 3 1.10 outer wall of hard tube Then the shell of Cold-keeping Layer 2.9 is mounted at pipeline by gel mat, and past internal filled polyurethane foam；
4th step, in 2.1 upper right comer region of control cabinet fixed in certain sequence industrial plate 3.1,24V power supply 3.2, relay Device 3.3, A/D capture card 3.4, D/A capture card 3.5, start button 3.6 and close key 3.7；And according to the circuit connection in attached drawing 2 Schematic diagram, using conducting wire connection control unit and sensing execution unit, and the installation regulation software in industrial plate 3.1；
Liquid nitrogen is as follows for giving regulation implementation process: as shown in figure 3, the first step, presses start button 3.6, it is regulation device It powers on, open industrial plate 3.1 and starts regulation software；The valve port opening value of electric control valve 2.6 is transferred to 100%, is guaranteed Pipeline pre-coo time is reduced while transfer conduit is unimpeded；The shut-off valve 1.3 on liquid nitrogen storage tank 1.2 is unscrewed, liquid nitrogen passes through pipeline It is sprayed from nozzle 1.12；Pressure reducing valve 2.2 is adjusted to 0.6MPa in regulation software, the inlet pressure as liquid nitrogen；About 25min Afterwards, liquid nitrogen temperature be reduced to -170 DEG C hereinafter, and amplitude of variation be gradually reduced, at this time liquid nitrogen transmission it is basicly stable, pre-cooling complete；
Second step sets 39% for the valve port opening value h of electric control valve 2.6, and the state in observation regulation software is real Duration, liquid nitrogen outlet pressure is 0.45MPa at this time, and liquid nitrogen temperature is -182 DEG C, and liquid nitrogen hybrid density is 780kg/m3, so liquid The density ratio S=0.78 of nitrogen and water, regulating valve front and back pressure differential deltap P=0.15MPa, can be calculated liquid nitrogen stream according to formula (1) Q=32.4kg/h is measured, the real-time change curve of liquid nitrogen temperature, outlet pressure and flow is as shown in attached drawing 4,5 and 6；It is mixed by liquid nitrogen Close density 780kg/m3It is found that the void fraction in liquid nitrogen is 3.8% at this time, belong to bubble flow；
Third step is implemented the cooling processing of ultralow temperature using above-mentioned liquid nitrogen temperature, pressure, flow as cooling parameter, is completed the process Afterwards, it is first shut off shut-off valve 1.3, industrial plate 3.1 is then shut off, finally presses close key 3.7, it is ensured that is electric under regulation device.
The present invention effectively passes through the pressure stabilization function of cold insulation measure and pressure reducing valve, ensure that liquid nitrogen transmission in pressure, flow, The stability of the states such as temperature；By a series of sensors and control element is adjusted, realizes the real-time of the more transmission states of liquid nitrogen Monitoring and control；Free-standing, the removable design of device provides support for the cooling processing of ultralow temperature of machine tool.

Claims (2)

1. a kind of free-standing liquid nitrogen towards the cooling processing of ultralow temperature is for giving regulation device, which is characterized in that the stand alone type liquid Nitrogen includes liquid nitrogen supply transmission unit, sensing execution unit and control unit, wherein liquid nitrogen supply transmission for giving regulation device Unit includes liquid nitrogen source and transfer conduit；Sensing execution unit includes various kinds of sensors and valve element, is responsible for the inspection of liquid nitrogen state It surveys and adjusts；Control unit is mainly made of controller and data transmission module, the acquisition and operation of responsible data and state Information is shown to be transmitted with order；
The described liquid nitrogen supply transmission unit includes that trolley (1.1), liquid nitrogen storage tank (1.2), shut-off valve (1.3), arrival end are true Empty hose (1.6), vacuum hard tube (1.7), hard tube one (1.8), hard tube two (1.9), hard tube three (1.10), outlet end vacuum hose (1.11) and nozzle (1.12)；Liquid nitrogen storage tank (1.2) is placed on trolley (1.1), is moved easily；Liquid nitrogen storage tank (1.2) top Portion is equipped with the shut-off valve (1.3) of control liquid nitrogen liquid in-out and the liquidometer (1.4) of detection liquid nitrogen reserves；Liquid nitrogen storage tank (1.2) is logical It crosses connector (1.5) to connect with arrival end vacuum hose (1.6), arrival end vacuum hose (1.6) and vacuum hard tube (1.7) pass through method Orchid one (1.a) connection, wherein vacuum hard tube (1.7) other end is located inside control cabinet (2.1), is apart from bottom of cabinet on vertical direction The 1/3 of cabinet height；Internal in control cabinet (2.1), vacuum hard tube (1.7) and pressure reducing valve (2.2) are connected by flange two (1.b) It connects, guarantees that pressure reducing valve (2.2) are vertically-mounted；Pressure reducing valve (2.2) other end is connect with hard tube one (1.8) by flange three (1.c), It drills in the middle part of hard tube one (1.8) and protrudes into the measurement end of inlet pressure transducer (2.3) in pipe, then shut hole；Firmly Pipe one (1.8) other end is connect by flange four (1.d) with flowmeter (2.4), guarantees that flowmeter (2.4) are vertically-mounted；Flow Meter (2.4) other end is connect with hard tube two (1.9) by flange five (1.e), is drilled on hard tube two (1.9) and is installed safety valve (2.5)；Electric control valve (2.6) one end is connect by flange six (1.f) with hard tube two (1.9), and the other end passes through flange seven (1.g) is connect with hard tube three (1.10), and electric control valve (2.6) is vertically-mounted and is fixed on control by two bolts (1.i) Cabinet (2.1)；The drill two holes at a certain distance on hard tube three (1.10) successively pass temperature sensor (2.7) and outlet pressure The measurement end of sensor (2.8) protrudes into pipe, then shuts hole；Hard tube three (1.10) is true by flange eight (1.h) and outlet end Empty hose (1.11) connection；Vacuum hose (1.11) end in outlet end is using thread connecting mode installation nozzle (1.12)；Except soft The outer all pipeline guarantees of pipe are horizontally mounted, and the faying face among flange all uses teflon gasket to seal；To control cabinet (2.1) horizontal pipeline in makees heat-insulated processing, is formed Cold-keeping Layer (2.9), to reduce the gasification in liquid nitrogen transmission process and guarantor Demonstrate,prove pressure, the stability of flow and temperature；
The sensing execution unit includes liquidometer (1.4), flowmeter (2.4), safety valve (2.5), inlet pressure transducer (2.3), outlet pressure sensor (2.8), temperature sensor (2.7), pressure reducing valve (2.2) and electric control valve (2.6)；
The control unit include industrial plate (3.1), 24V power supply (3.2), relay (3.3), A/D capture card (3.4), D/A capture card (3.5), start button (3.6) and close key (3.7)；Control unit is mounted on the upper right side area of control cabinet (2.1) Domain is connected inside control unit, between control unit and sensing execution unit using conducting wire；Start button (3.6) and close key (3.7) it is connect respectively with relay (3.3), controls the on-off of 220V circuit；Relay (3.3) respectively with industrial plate (3.1), 24V power supply (3.2), electric control valve (2.6) connection, provide 220V power supply for it；24V power supply (3.2) and liquidometer (1.4), Flowmeter (2.4), temperature sensor (2.7), inlet pressure transducer (2.3), outlet pressure sensor (2.8), pressure reducing valve (2.2), A/D capture card (3.4) and D/A capture card (3.5) connection, and power for it；Industrial plate (3.1) and A/D capture card (3.4) it is connected with D/A capture card (3.5)；Liquid nitrogen reserves in liquid nitrogen storage tank (1.2) are converted into mould by liquidometer (1.4) in real time Analog quantity signal is converted into digital quantity signal by A/D capture card (3.4) and is transmitted to industrial plate (3.1)；Pass through identical side Formula, flowmeter (2.4) is by liquid nitrogen flow and hybrid density real-time Transmission to industrial plate (3.1), and temperature sensor (2.7) is by liquid Nitrogen real time temperature is transmitted to industrial plate (3.1), and the real-time input pressure of liquid nitrogen is transmitted to industry by inlet pressure transducer (2.3) The real-time output pressure of liquid nitrogen is transmitted to industrial plate (3.1) by plate (3.1), outlet pressure sensor (2.8)；Industrial plate (3.1) the real-time processing and the real-time display of numerical value and change curve of data are realized, while can be defeated in industrial plate (3.1) Enter to set inlet pressure level and valve port opening value, analog quantity is converted by D/A capture card (3.5), and analog quantity is transmitted to Pressure reducing valve (2.2) and electric control valve (2.6) realize the adjusting of liquid nitrogen pressure, flow and temperature；Pressure reducing valve (2.2) is except adjusting Outside liquid nitrogen pressure, moreover it is possible to play the role of steady pressure；The pass of the valve port opening value h and liquid nitrogen flow q of electric control valve (2.6) System are as follows:
In formula, KvsFor regulating valve rated flow coefficient, S is the density ratio of liquid nitrogen and water, and Δ P is pressure difference before and after regulating valve；
Implement liquid nitrogen for pressing start button (3.6) first, it is ensured that regulation device works on power, then will be electronic when giving regulation The valve port opening value of regulating valve (2.6) is transferred to maximum, guarantees to reduce pipeline pre-coo time while transfer conduit is unimpeded, twist later The shut-off valve (1.3) on liquid nitrogen storage tank (1.2) is opened, liquid nitrogen is sprayed from nozzle (1.12) by pipeline；Observe industrial plate (3.1) Real-time Monitoring Data in, wait liquid nitrogen temperature be reduced to -170 DEG C or less and it is basicly stable after, control pressure reducing valve (2.2) with electric control valve (2.6), the adjusting of liquid nitrogen pressure and flow is realized, the regulation of liquid nitrogen temperature can pass through adjusting at this time Flow is realized；Ultralow temperature is cooling after processing is completed, is first shut off shut-off valve (1.3), then presses close key (3.7), it is ensured that It is electric under regulation device.
2. the free-standing liquid nitrogen according to claim 1 towards the cooling processing of ultralow temperature is for giving regulation device, feature It is, the Cold-keeping Layer (2.9) is double-layer structure, and first layer is to twine the airsetting rubber mat covered outside pipeline, and the second layer is cold insulation The polyurethane foam filled between the shell and airsetting rubber mat of layer (2.9).
CN201910800798.0A 2019-08-28 2019-08-28 It is a kind of to supply to give regulation device towards the cooling free-standing liquid nitrogen processed of ultralow temperature Withdrawn CN110529730A (en)

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PCT/CN2019/105935 WO2021035824A1 (en) 2019-08-28 2019-09-16 Independent liquid nitrogen supply and regulation device for ultralow-temperature cooling machining

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112264835A (en) * 2020-10-20 2021-01-26 中国兵器装备集团自动化研究所 Cryogenic cooling energetic material cutting method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205065177U (en) * 2015-10-14 2016-03-02 浙江振申绝热科技股份有限公司 Hot heat preservation system of pipeline
CN107388032A (en) * 2017-07-04 2017-11-24 大连理工大学 A kind of regulation and control method of the in stable condition flow of liquid nitrogen injection
CN108506279A (en) * 2018-03-26 2018-09-07 华中科技大学 A kind of high-pressure pneumatic servo valve mass flow characteristic detecting apparatus and method
CN207964269U (en) * 2018-03-19 2018-10-12 陕西航天机电环境工程设计院有限责任公司 Mobile low-temperature valve detection repairs experimental rig
US20180320823A1 (en) * 2012-01-31 2018-11-08 J-W Power Company CNG Fueling System

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000018494A (en) * 1998-06-26 2000-01-18 Taiyo Toyo Sanso Co Ltd Liquid nitrogen feeder
CN101209528A (en) * 2006-12-26 2008-07-02 浙江工业大学 Cooling device for cutting process
CN202561440U (en) * 2012-03-31 2012-11-28 中国科学院上海应用物理研究所 Control device for liquid nitrogen transport system
CN107388042B (en) * 2017-08-14 2020-05-12 上海航天设备制造总厂 Liquid nitrogen continuous supply device and method for ultralow temperature cutting
WO2019070556A1 (en) * 2017-10-02 2019-04-11 Romanos John L Systems and methods for management of cryogenic storage vessels
CN108406430B (en) * 2018-02-12 2019-09-27 大连理工大学 A kind of ultralow temperature medium internal combustion numerically-controlled machine tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180320823A1 (en) * 2012-01-31 2018-11-08 J-W Power Company CNG Fueling System
CN205065177U (en) * 2015-10-14 2016-03-02 浙江振申绝热科技股份有限公司 Hot heat preservation system of pipeline
CN107388032A (en) * 2017-07-04 2017-11-24 大连理工大学 A kind of regulation and control method of the in stable condition flow of liquid nitrogen injection
CN207964269U (en) * 2018-03-19 2018-10-12 陕西航天机电环境工程设计院有限责任公司 Mobile low-temperature valve detection repairs experimental rig
CN108506279A (en) * 2018-03-26 2018-09-07 华中科技大学 A kind of high-pressure pneumatic servo valve mass flow characteristic detecting apparatus and method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
袁凯: "超低温加工用液氮传输调控系统研制", 《中国优秀硕士学位论文全文数据库（电子期刊）》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112264835A (en) * 2020-10-20 2021-01-26 中国兵器装备集团自动化研究所 Cryogenic cooling energetic material cutting method

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