CN108202271B - Low-temperature micro-lubrication device based on supercritical carbon dioxide - Google Patents
Low-temperature micro-lubrication device based on supercritical carbon dioxide Download PDFInfo
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- CN108202271B CN108202271B CN201810212249.7A CN201810212249A CN108202271B CN 108202271 B CN108202271 B CN 108202271B CN 201810212249 A CN201810212249 A CN 201810212249A CN 108202271 B CN108202271 B CN 108202271B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 530
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 265
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 265
- 238000005461 lubrication Methods 0.000 title claims abstract description 29
- 238000003860 storage Methods 0.000 claims abstract description 79
- 239000000314 lubricant Substances 0.000 claims abstract description 71
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 239000012530 fluid Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 41
- 238000005520 cutting process Methods 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000001050 lubricating effect Effects 0.000 abstract description 29
- 238000001816 cooling Methods 0.000 abstract description 14
- 238000012545 processing Methods 0.000 abstract description 13
- 239000003921 oil Substances 0.000 description 68
- 238000000034 method Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 15
- 230000000694 effects Effects 0.000 description 9
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 238000010992 reflux Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000010687 lubricating oil Substances 0.000 description 5
- 239000012535 impurity Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 239000002173 cutting fluid Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 231100000206 health hazard Toxicity 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005802 health problem Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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
- B23Q11/1038—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality
- B23Q11/1061—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality using cutting liquids with specially selected composition or state of aggregation
-
- 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
- B23Q11/1038—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality
-
- 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
- B23Q11/1038—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality
- B23Q11/1046—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality using a minimal quantity of lubricant
-
- 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
- B23Q11/1038—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality
- B23Q11/1053—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality using the cutting liquid at specially selected temperatures
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Nozzles (AREA)
Abstract
The invention discloses a low-temperature micro-lubrication device based on a supercritical carbon dioxide fluid lubricant, which comprises an autoclave with a heating function, a carbon dioxide gas cylinder, a carbon dioxide pressurizing and conveying device and a nozzle, wherein a piston is arranged in the autoclave to divide the inner cavity of the autoclave into a supercritical carbon dioxide storage cavity and a constant-pressure driving cavity, the supercritical carbon dioxide storage cavity is connected with the carbon dioxide pressurizing and conveying device and the nozzle, and the constant-pressure driving cavity is connected with a constant-pressure device capable of introducing a constant-pressure medium into the constant-pressure driving cavity; the supercritical carbon dioxide storage chamber is also connected with a lubricant supply device for feeding in a trace amount of lubricant. In the invention, the pressure in the supercritical carbon dioxide storage cavity is always constant, so that the mixing performance of the supercritical carbon dioxide and the lubricant in the autoclave is always consistent, the cooling and lubricating performances of the autoclave are kept constant, and the instability of the processing quality of a workpiece is not caused.
Description
Technical Field
The invention relates to a lubricating device for cutting and processing a difficult-to-process metal material, in particular to a low-temperature micro lubricating device based on supercritical carbon dioxide.
Background
With the development of science and technology, materials which are difficult to process, such as high-temperature alloy, titanium alloy, austenitic stainless steel, quenched steel and the like, are increasingly widely applied to the fields of aerospace, petrochemical industry, automobiles and the like due to the advantages of high hardness, high melting point, good wear resistance, strong oxidation resistance, strong corrosion resistance and the like; but the characteristics of the materials also lead to large cutting force, high temperature of a cutting area, difficult breakage of chips, poor integrity of a machined surface and short service life of a cutter in the machining process. The low-temperature lubrication technology based on supercritical carbon dioxide is characterized in that supercritical carbon dioxide is used as a transportation carrier of lubricating oil, supercritical carbon dioxide fluid in which the lubricating oil is dissolved is sprayed out from a nozzle, so that the cutting area is cooled at a high efficiency and low temperature, good lubrication is realized, the difficult-to-process material is cut by adopting the technology, the cutting temperature can be effectively reduced, the service life of a cutter and the surface processing quality are improved, and the environmental pollution and even the human health hazard caused by using a large amount of cutting fluid can be reduced. The problem of stable and controllable transportation of supercritical carbon dioxide fluid is a key link for realizing supercritical carbon dioxide low-temperature lubrication technology.
The patent of CN10128415B discloses a method for lubricating metal workpieces during metal working processes in which supercritical carbon dioxide is utilized as a lubricant, coolant, chip-emptying agent and/or carrier for another lubricant or buffer, thereby reducing or eliminating the health problems associated with conventional cutting fluids; in this patent document, there is also proposed a proposal of using supercritical carbon dioxide as a carrier of a lubricant or another lubricant in a metal cutting process, specifically, using supercritical carbon dioxide in a tapping torque process; detailed description of the invention is given in paragraphs 36-38 of the specification and figure 1 of the drawings accompanying the specification; it is explicitly proposed in paragraph 37 of the specification that the computer L receives temperature data from the thermocouple J or pressure data from the pressure sensing means in order to make the pressure inside the container H correspond as much as possible to a predetermined range; at the same time, the heating element I and the pressure transducer K are controlled by the computer L, thereby changing the pressure inside the container H, ensuring correspondence with a predetermined range.
In the above scheme, the pressure control in the container H is unstable and is passively regulated, specifically, after the supercritical carbon dioxide is sprayed out from the nozzle, the pressure in the container H gradually decreases, when the pressure decreases to exceed a preset range, the computer L performs pressure regulation again, and opens the air inlet valve to allow the supercritical carbon dioxide to enter the container H, so that the pressure in the container H increases to the preset range; in the whole process, the pressure in the container H always has certain fluctuation and cannot be continuously maintained in a constant pressure range, so that the sprayed supercritical carbon dioxide or the lubricant taking the supercritical carbon dioxide as a carrier also fluctuates and cannot be uniformly sprayed on a processing station at a constant flow rate and a constant flow velocity, and the lubrication and cooling effects are affected; in addition, the non-constant pressure inside the container H also affects the uniformity of mixing of the other lubricant with the supercritical carbon dioxide, so that the lubrication and cooling effects are also unstable, resulting in a difference in workpiece performance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a low-temperature micro-lubrication device based on supercritical carbon dioxide, which can ensure that supercritical carbon dioxide fluid dissolved with micro-lubricating oil can be sprayed out under constant pressure and uniformly sprayed into a cutting area, thereby playing the roles of optimal micro-lubrication and low-temperature cooling on a cutter and a workpiece.
The aim of the invention is achieved by the following technical scheme:
The low-temperature micro-lubrication device based on the supercritical carbon dioxide fluid lubricant comprises an autoclave with a heating function, a carbon dioxide gas cylinder with carbon dioxide gas, a carbon dioxide pressurizing and conveying device for pressurizing and conveying carbon dioxide in the carbon dioxide gas cylinder into the autoclave, and a nozzle for conveying supercritical carbon dioxide in the autoclave to a cutting station, and is characterized in that a piston is arranged in the autoclave to divide an inner cavity of the autoclave into a supercritical carbon dioxide storage cavity and a constant-pressure driving cavity, wherein the supercritical carbon dioxide storage cavity is connected with the carbon dioxide pressurizing and conveying device and the nozzle, and the constant-pressure driving cavity is connected with a constant-pressure device capable of introducing a constant-pressure medium into the constant-pressure driving cavity; the supercritical carbon dioxide storage chamber is also connected with a lubricant supply device for feeding in a trace amount of lubricant.
The working principle of the low-temperature micro-lubrication device based on the supercritical carbon dioxide fluid lubricant is as follows:
When the lubricant is required to be sprayed in the metal processing process, the carbon dioxide pressurizing and conveying device pressurizes and conveys the carbon dioxide gas in the carbon dioxide gas cylinder to a supercritical carbon dioxide storage cavity in the autoclave, at the moment, a piston in the autoclave continuously moves towards the end part of the constant-pressure driving cavity while inputting the carbon dioxide gas, and when the autoclave is filled with the carbon dioxide gas, the piston moves to the end part of the constant-pressure driving cavity; the supercritical carbon dioxide is gradually formed under the specific pressure and temperature in the autoclave, and meanwhile, the lubricant supply device supplies a trace amount of lubricant into the supercritical carbon dioxide storage cavity, and the trace amount of lubricant is absorbed by the supercritical carbon dioxide under the constant temperature and pressure, and the supercritical carbon dioxide and the lubricant are uniformly mixed together; then, the constant pressure device conveys constant pressure medium to a constant pressure driving cavity in the autoclave, so that the piston moves towards the supercritical carbon dioxide storage cavity under the action of the constant pressure medium, and finally the pressure formed in the constant pressure driving cavity and the supercritical carbon dioxide storage cavity is the same; when the device works, the nozzle is opened, so that supercritical carbon dioxide in the supercritical carbon dioxide storage cavity is sprayed out, and meanwhile, the constant-pressure device continuously and stably conveys constant-pressure medium to the constant-pressure driving cavity, so that the pressure in the constant-pressure driving cavity is kept unchanged; since the pressure in the constant pressure driving chamber is kept unchanged, and the external atmospheric pressure communicated with the nozzle is also kept unchanged, the lubricant can be continuously and uniformly sprayed out through the nozzle under the action of the constant pressure medium and the piston. Through setting up the piston in the autoclave to combine with constant voltage device, just can make supercritical carbon dioxide spray out uniformly, and the pressure in the autoclave keeps unchanged in the injection process, and whole process need not control and manual regulation, convenient operation, simple structure and design benefit improve cutting's cooling and lubrication effect.
According to the invention, the constant-pressure medium in the constant-pressure device is oil, the constant-pressure device comprises an oil tank for storing the oil, an oil pump for conveying the oil in the oil tank to the constant-pressure driving cavity through a pipeline, a controller for controlling the operation of the oil pump and a pressure detector for monitoring the pressure of the supercritical carbon dioxide storage cavity in the autoclave in real time, the pressure detector sends the pressure of the supercritical carbon dioxide storage cavity to the controller in real time, and the controller controls the operation of the oil pump according to the real-time pressure monitored by the pressure detector and the set pressure of the supercritical carbon dioxide storage cavity.
The working principle of the constant pressure device is as follows: the pressure detector detects the pressure in the supercritical carbon dioxide storage cavity in real time and feeds back the pressure to the controller, the controller compares the real-time pressure with a set pressure value, and according to a comparison result, the pressure is adjusted by controlling the oil feeding speed of the oil pump, for example, when the real-time pressure is smaller than the set pressure, the oil feeding speed of the oil pump is increased, and the real-time pressure of the supercritical carbon dioxide storage cavity is always consistent with the set pressure, so that constant-pressure injection of the supercritical carbon dioxide is ensured. Because of the real-time closed-loop control, the pressure of the supercritical carbon dioxide storage cavity can be ensured not to have excessive fluctuation and is always maintained at a constant set pressure.
Preferably, a first pressure gauge is provided between the oil pump and the autoclave, which first pressure gauge is connected to the controller and delivers real-time pressure values to the pressure controller. Because the pressure of the two sides of the piston in the autoclave is equal, the pressure in the supercritical carbon dioxide storage cavity can be reflected by detecting the pressure value in the first pressure gauge in real time, and double feedback and pressure verification can be realized by monitoring the data of the pressure detector and the first pressure gauge in real time, so that the control is more accurate.
Preferably, the constant pressure device further includes a first shut-off valve provided in a pipe line between the autoclave and the oil pump, and a return valve connected in parallel with the oil pump through the pipe line. The first stop valve and the reflux valve are used for carrying out on-off control on the oil liquid, so that the structure is simple; meanwhile, after the lubricant is sprayed or when the spraying is required to be stopped, the pressure in the constant-pressure driving cavity is reduced by opening the reflux valve, so that the lubricant is not sprayed any more, and the carbon dioxide pressurized conveying device can convey the carbon dioxide gas into the autoclave again and smoothly; in addition, the reflux valve is connected with the oil pump in parallel, and oil in the autoclave and the pipeline can be drained into the oil groove to recycle the oil.
Preferably, a first safety valve and a first exhaust valve are arranged at the outlet of the oil pump, and a first check valve is arranged between the first exhaust valve and the first stop valve; the return valve is connected in parallel with the oil pump, the first relief valve, the first exhaust valve, and the first check valve. When the pressure in the pipeline between the oil pump and the autoclave is overlarge, the pressure can be relieved through the action of the first safety valve, so that the medium pressure in the pipeline is prevented from being too high, the medium is discharged to the outside in time, and the safety of workers and the normal operation of the device are both important; the first exhaust valve has the functions of: when the oil is conveyed, the first exhaust valve is opened to discharge gas or other impurity oil in the pipeline, and when the discharged oil is continuous, the first exhaust valve is closed again, so that pure oil is conveyed into the high-pressure kettle, and the constant pressure of the constant-pressure driving cavity is ensured; the medium in the pipeline can be prevented from flowing backwards into the oil pump through the function of the stop valve, and the normal operation of the oil pump is ensured.
The effect of setting up the pre-heater lies in: when the device works, carbon dioxide gas is conveyed into a supercritical carbon dioxide storage cavity under the action of a conveying pump, supercritical carbon dioxide is gradually formed under the constant pressure and temperature environment of the autoclave, preparation is made for processing and cooling of metal, and the formation of the supercritical carbon dioxide is closely related to the pressure and the temperature; carbon dioxide gas can reach the supercritical carbon dioxide storage cavity after being discharged from the carbon dioxide gas cylinder and passes through the pipeline, and the carbon dioxide gas can exchange heat with the outside in the whole conveying process, so that the difference of the outside temperature is large in different seasons and different places, and therefore, the original temperature of the carbon dioxide gas conveyed into the supercritical carbon dioxide storage cavity in different using environments is greatly different, after the carbon dioxide gas enters the autoclave, the temperature for forming the supercritical carbon dioxide can be reached after the carbon dioxide gas enters the autoclave, the time for forming the supercritical carbon dioxide gas in the autoclave is different in different outside temperatures, and adverse effects are caused on the use, for example, the mixing uniformity of the supercritical carbon dioxide and the lubricant is influenced, and when the outside temperature is low, the carbon dioxide gas needs to wait for a long time to be used normally after being conveyed into the autoclave. The preheater is arranged in the carbon dioxide gas conveying pipeline, so that on one hand, the temperature of the carbon dioxide gas passing through the preheater can uniformly reach a set value regardless of the external temperature, for example, the temperature value required by forming supercritical carbon dioxide or the temperature value close to the temperature value can be obtained, the carbon dioxide gas entering the supercritical carbon dioxide storage cavity can form supercritical carbon dioxide immediately or quickly, the forming time can be kept consistent, the control of the autoclave is facilitated, and the formed supercritical carbon dioxide can be quickly and fully mixed with the lubricant; on the other hand, due to the arrangement of the preheater, the carbon dioxide gas entering the supercritical carbon dioxide storage cavity reaches or approaches to the temperature value required by forming the supercritical carbon dioxide, so that the carbon dioxide gas can be quickly converted into the supercritical carbon dioxide after entering the supercritical carbon dioxide storage cavity and can be immediately sprayed out for use, the time for obtaining the supercritical carbon dioxide low-temperature micro-lubricant is shorter, the equipment can be started and used immediately, and the equipment is not required to wait for excessive time in the use process.
Preferably, the carbon dioxide pressurized delivery device further comprises a second stop valve arranged between the carbon dioxide gas cylinder and the delivery pump and a switch valve arranged between the delivery pump and the autoclave; the switch valve comprises a third stop valve and a fourth stop valve; along the conveying direction of the carbon dioxide gas, the third stop valve, the preheater and the fourth stop valve are sequentially arranged on pipelines of the conveying pump and the autoclave.
When the carbon dioxide gas is conveyed, the third stop valve is firstly opened, and then the fourth stop valve is opened after a period of time, so that the carbon dioxide gas can be preheated to a specified temperature and then conveyed into the supercritical carbon dioxide storage cavity, and the temperature consistency is ensured.
Preferably, a first thermometer is arranged in the preheater, a second thermometer is arranged on the autoclave, and the first thermometer and the second thermometer are connected with a controller. The first thermometer and the second thermometer are used for transmitting the real-time temperature to the controller, and the controller controls the corresponding heating elements to work, so that the temperatures of the preheater and the supercritical carbon dioxide storage cavity can be ensured to be at set values.
Preferably, a second safety valve and a second exhaust valve are arranged at the outlet of the delivery pump, and a second check valve is arranged between the second exhaust valve and the third stop valve; a second pressure gauge is arranged in the pipeline between the preheater and the fourth stop valve. The pressure of carbon dioxide gas in the pipeline can be timely known through the second pressure gauge, and timely adjustment of the device by workers is facilitated.
In a preferred embodiment of the present invention, the lubricant supply device includes a liquid storage tank and a liquid charging tank disposed between the liquid storage tank and the supercritical carbon dioxide storage chamber; a fifth stop valve is arranged between the liquid storage tank and the liquid adding tank, and a sixth stop valve is arranged between the liquid adding tank and the supercritical carbon dioxide storage cavity. Through the lubricant supply device, the first liquid adding valve can be opened after carbon dioxide gas is introduced into the autoclave, and a proper amount of lubricating liquid is added, so that the lubricating liquid is fully mixed with the formed supercritical carbon dioxide in the autoclave and then sprayed out; meanwhile, the liquid adding tank and the sixth stop valve are beneficial to the control of the adding amount of the lubricating liquid by workers.
Preferably, a third safety valve and a third exhaust valve are also connected to the supercritical carbon dioxide storage chamber. The third safety valve has the function of preventing the pressure in the autoclave from being excessive and ensuring the safe operation of the device; before the nozzle is opened to spray the lubricant, the third exhaust valve is opened first to discharge the impurity gas which is not completely mixed in the high-pressure kettle, and when the third exhaust valve discharges the continuous pure lubricant, the nozzle is opened again to ensure that the pure lubricant is sprayed out at the cutting station.
In a preferred embodiment of the invention, the line between the nozzle and the autoclave is a metal hose, so that the nozzle can be moved to different positions for spraying lubricant to adapt to different processing equipment and cutting stations.
Preferably, the metal hose comprises a mixing part and connecting parts arranged at two ends of the mixing part, and the inner cavity of the mixing part is larger than the connecting parts. Because the inner cavity of the mixing part is larger than the connecting part, after the lubricant gas reaches the mixing part through the connecting part, the supercritical carbon dioxide and the lubricant are further fully mixed due to volume expansion; and then the lubricating liquid is sprayed out through a nozzle, so that the mixing degree of the lubricating liquid and the supercritical carbon dioxide is improved, and the cooling and lubricating effects are improved.
Preferably, a spiral pipe is connected in front of the nozzle. The function is as follows: the spiral pipe is provided with a spiral channel through which supercritical carbon dioxide and lubricant pass before being sprayed, and the flow direction is continuously changed in the spiral flow process, so that further mixing of the supercritical carbon dioxide and the lubricant is facilitated, and the cooling and lubricating effects are further improved.
Compared with the prior art, the invention has the following beneficial effects:
1. According to the invention, the constant-pressure medium is conveyed into the constant-pressure driving cavity of the autoclave through the constant-pressure device, and the piston is pushed to move, so that the pressure in the autoclave can be kept constant when the nozzle sprays supercritical carbon dioxide, and the nozzle can uniformly spray the supercritical carbon dioxide, so that the optimal cooling and lubricating effects are achieved in the metal processing process.
2. The means for realizing constant pressure in the supercritical carbon dioxide storage cavity is realized by introducing a constant pressure medium into the constant pressure driving cavity, and is not realized by changing the amount of carbon dioxide in the supercritical carbon dioxide storage cavity as in the prior art, namely, in the invention, the introduction of carbon dioxide into the supercritical carbon dioxide storage cavity can be stopped, the constant pressure in the supercritical carbon dioxide storage cavity can be ensured, and thus, the using amount of carbon dioxide can be saved; and when the carbon dioxide in the carbon dioxide gas cylinder is used up and needs to be replaced, the low-temperature micro-lubrication device can still work continuously.
3. In the invention, the pressure in the supercritical carbon dioxide storage cavity is always constant and does not fluctuate, so that the mixing performance of the supercritical carbon dioxide and the lubricant in the autoclave is always consistent, the cooling and lubricating performances of the supercritical carbon dioxide and the lubricant are kept constant, and the instability of the processing quality of a workpiece is not caused.
4. The invention combines the mode of taking supercritical carbon dioxide as a carrier with the mode of micro lubrication, takes the supercritical carbon dioxide as a transportation carrier of lubricating oil, sprays out supercritical carbon dioxide fluid dissolved with micro lubricating oil from a nozzle, realizes strong low-temperature cooling and good micro lubrication on a cutting area, adopts the technology to cut difficult-to-process materials, can effectively reduce the cutting temperature, improve the service life of a cutter and the surface processing quality, and can reduce the environmental pollution and even human health hazard caused by using a large amount of cutting fluid.
Drawings
FIG. 1 is a schematic flow chart of a supercritical carbon dioxide fluid lubricant spraying device according to the present invention.
Fig. 2 is a schematic view of a first embodiment of the hose of fig. 1.
Fig. 3 is a schematic view of a second embodiment of the hose of fig. 1.
Fig. 4 is a schematic view of a third embodiment of the hose of fig. 1.
Detailed Description
The invention is further described below with reference to examples and figures, but embodiments of the invention are not limited thereto.
Referring to fig. 1, a low-temperature micro-lubrication device based on a supercritical carbon dioxide fluid lubricant of the present embodiment includes an autoclave 10, a carbon dioxide gas cylinder 28 storing carbon dioxide gas, a carbon dioxide pressurized conveying device for pressurized conveying of carbon dioxide in the carbon dioxide gas cylinder 28 into the autoclave 10, and a nozzle 18 for conveying supercritical carbon dioxide in the autoclave 10 to a cutting station; a piston is arranged in the autoclave 10 to divide the inner cavity of the autoclave into a supercritical carbon dioxide storage cavity and a constant pressure driving cavity, wherein the supercritical carbon dioxide storage cavity is connected with a carbon dioxide pressurizing and conveying device and a nozzle 18, and the constant pressure driving cavity is connected with a constant pressure device capable of introducing a constant pressure medium into the constant pressure driving cavity; the supercritical carbon dioxide storage chamber is also connected with a lubricant supply device for feeding in a trace amount of lubricant.
Referring to fig. 1, the constant pressure medium in the constant pressure device is oil, the constant pressure device comprises an oil tank 1 for storing the oil, an oil pump 2 for conveying the oil in the oil tank 1 to the constant pressure driving cavity through a pipeline, a controller for controlling the operation of the oil pump 2, and a pressure detector 16 for monitoring the pressure of the supercritical carbon dioxide storage cavity in the autoclave 10 in real time, the pressure detector 16 sends the pressure of the supercritical carbon dioxide storage cavity to the controller in real time, and the controller controls the operation of the oil pump 2 according to the real-time pressure monitored by the pressure detector 16 and the set pressure of the supercritical carbon dioxide storage cavity.
The working principle of the constant pressure device is as follows: the pressure detector 16, the controller and the oil pump 2 form a closed-loop control system, the pressure detector 16 detects the pressure in the supercritical carbon dioxide storage cavity in real time and feeds back the pressure to the controller, the controller compares the real-time pressure with a set pressure value, and according to the comparison result, the pressure adjustment is realized by controlling the oil feeding speed of the oil pump 2, for example, when the real-time pressure is smaller than the set pressure, the oil feeding speed of the oil pump 2 is increased, and the real-time pressure of the supercritical carbon dioxide storage cavity is always kept consistent with the set pressure, so that constant-pressure injection of the supercritical carbon dioxide is ensured. Because of the real-time closed-loop control, the pressure of the supercritical carbon dioxide storage cavity can be ensured not to have excessive fluctuation and is always maintained at a constant set pressure.
Preferably, a first pressure gauge 8 is provided between the oil pump 2 and the autoclave 10, which first pressure gauge 8 is connected to the pressure controller and delivers real-time pressure values to the pressure controller. Because the pressure of the two sides of the piston in the autoclave 10 is equal, the pressure in the supercritical carbon dioxide storage cavity can be reflected by detecting the pressure value in the first pressure gauge 8 in real time, and double feedback and pressure verification can be realized by monitoring the data of the pressure detector 16 and the first pressure gauge 8 in real time, so that the control is more accurate.
Referring to fig. 1, the constant pressure driving apparatus further includes a first shut-off valve 6 provided in a pipe line between the autoclave 10 and the oil pump 2, and a return valve 7 connected in parallel with the oil pump 2 through the pipe line. The first stop valve 6 and the return valve 7 are used for controlling the on-off of the oil liquid delivery, so that the structure is simple; meanwhile, after the lubricant injection is completed or when the injection needs to be stopped, the pressure in the constant-pressure driving chamber is reduced by opening the return valve 7, so that the lubricant is not injected any more, and the carbon dioxide pressurizing and conveying device can smoothly convey the carbon dioxide gas into the autoclave 10 again; the return valve 7 is connected in parallel with the oil pump 2, and the oil in the autoclave 10 and the pipeline can be drained to the oil tank 1 to recover the oil.
Referring to fig. 1, a first relief valve 3 and a first discharge valve 4 are provided at an outlet of the oil pump 2, and a first check valve 5 is provided between the first discharge valve 4 and a first shut-off valve 6; the reflux valve 7 is connected in parallel with the oil pump 2, the first safety valve 3, the first exhaust valve 4 and the first check valve 5; a first pressure gauge 8 is provided in the line between the first shut-off valve 6 and the autoclave 10. When the pressure in the pipeline between the oil pump 2 and the autoclave 10 is overlarge, the pressure can be relieved through the action of the first safety valve 3, so that the medium pressure in the pipeline is prevented from being overhigh, the medium is discharged to the outside in time, and the safety of workers and the normal operation of the device are both important; the first exhaust valve 4 functions in: when the oil is conveyed, the first exhaust valve 4 is opened to discharge gas or other impurity oil in the pipeline, and when the discharged oil is continuous, the first exhaust valve is closed again to ensure that pure oil is conveyed into the autoclave 10, so that the constant pressure of the constant-pressure driving cavity is ensured; the medium in the pipeline can be prevented from flowing backwards into the oil pump 2 through the function of the stop valve, and the normal operation of the oil pump 2 is ensured.
In addition, the constant pressure medium may be a gas, and the constant pressure device includes a gas cylinder for storing the gas, a gas delivery pump 27 for delivering the gas into the constant pressure driving chamber, and a gas switching valve provided in the pipe line to control the gas delivery switch. The gas is selected as the constant pressure medium, so that the cost is low, and the conveying power can be reduced.
Referring to fig. 1, the carbon dioxide pressurizing and transporting device includes a transporting pump 27 that transports carbon dioxide gas in a carbon dioxide gas cylinder 28 into an autoclave 10 through a pipe, a second shut-off valve 29 provided between the carbon dioxide gas cylinder 28 and the transporting pump 27, and an on-off valve provided between the transporting pump 27 and the autoclave 10.
Referring to fig. 1, the carbon dioxide pressurizing and conveying device further comprises a preheater 23, and a first thermometer 21 is arranged on the preheater 23; a second thermometer 9 is arranged on the autoclave 10; the on-off valve comprises a third stop valve 22 and a fourth stop valve 19; the third shut-off valve 22, the preheater 23 and the fourth shut-off valve 19 are provided in this order on the piping of the transfer pump 27 and the autoclave 10 along the transfer direction of the carbon dioxide gas.
The function of the preheater 23 is to: in operation, carbon dioxide gas is conveyed into the supercritical carbon dioxide storage cavity under the action of the conveying pump 27, and supercritical carbon dioxide is gradually formed under the constant pressure and temperature environment of the autoclave 10, so as to prepare for the processing and cooling of metal, and the formation of the supercritical carbon dioxide is closely related to the pressure and the temperature; the carbon dioxide gas is discharged from the carbon dioxide cylinder 28 and then reaches the supercritical carbon dioxide storage cavity after passing through the pipeline, and the carbon dioxide gas exchanges heat with the outside in the whole conveying process, so that the difference of the outside temperature is large in different seasons and different places, and therefore, the original temperature of the carbon dioxide gas conveyed into the supercritical carbon dioxide storage cavity in different using environments is greatly different, after entering the autoclave 10, the temperature for forming the supercritical carbon dioxide can be reached after the carbon dioxide gas is heated for a certain time, and the time for forming the supercritical carbon dioxide gas in the autoclave 10 is different in different outside temperatures, so that adverse effects are caused on the use, for example, the mixing uniformity of the supercritical carbon dioxide and the lubricant is influenced, and when the outside temperature is low, the carbon dioxide gas needs to wait for a long time after being conveyed into the autoclave 10 to be normally used. The preheater 23 is disposed in the carbon dioxide gas delivery line, on the one hand, the temperature of the carbon dioxide gas passing through the preheater 23 can uniformly reach the set value regardless of the external temperature, for example, the temperature value required for forming supercritical carbon dioxide can be obtained, so that the carbon dioxide gas entering the supercritical carbon dioxide storage cavity can form supercritical carbon dioxide immediately or quickly, the forming time of each time can be kept consistent, the control of the autoclave 10 is facilitated, and the formed supercritical carbon dioxide can be quickly and fully mixed with the lubricant; on the other hand, due to the arrangement of the preheater 23, the carbon dioxide gas entering the supercritical carbon dioxide storage cavity reaches or approaches the temperature value required for forming the supercritical carbon dioxide, so that the carbon dioxide gas can be quickly converted into the supercritical carbon dioxide after entering the supercritical carbon dioxide storage cavity and can be immediately sprayed out for use, the time for obtaining the supercritical carbon dioxide low-temperature micro-lubricant is shorter, the device can be used immediately, and the device can be used immediately without waiting for excessive time in the use process.
In addition, when the carbon dioxide gas is conveyed, the third stop valve 22 is opened first, and then the fourth stop valve 19 is opened after a period of time, so that the carbon dioxide gas can be preheated to a specified temperature and then conveyed into the supercritical carbon dioxide storage cavity, and the temperature consistency is ensured. In addition, the first thermometer 21 and the second thermometer 9 transmit the real-time temperature to the controller, and the controller controls the corresponding heating elements to operate, so that the temperatures of the preheater 23 and the supercritical carbon dioxide storage chamber can be ensured to be at the set values.
Referring to fig. 1, a second relief valve 26 and a second exhaust valve 25 are provided at the outlet of the delivery pump 27, and a second check valve 24 is provided between the second exhaust valve 25 and the third check valve 22; a second pressure gauge 20 is arranged in the line between the preheater 23 and the fourth shut-off valve 19. The pressure of the carbon dioxide gas in the pipeline can be known in time through the second pressure gauge 20, and the device can be adjusted in time by workers.
Referring to fig. 1, the lubricant supply device includes a liquid storage tank 15 and a liquid charging tank 13 disposed between the liquid storage tank 15 and the supercritical carbon dioxide storage chamber; a fifth stop valve 14 is arranged between the liquid storage tank 15 and the liquid adding tank 13, and a sixth stop valve 11 is arranged between the liquid adding tank 13 and the supercritical carbon dioxide storage cavity. By the arrangement of the lubricant supply device, the first liquid adding valve can be opened after carbon dioxide gas is introduced into the autoclave 10, and a proper amount of lubricating liquid is added, so that the lubricating liquid is fully mixed with the formed supercritical carbon dioxide in the autoclave 10 and then sprayed out, and the lubrication effect of the lubricating liquid is improved; in the actual working process, the fifth stop valve 14 is firstly opened to convey a certain amount of lubricating liquid into the liquid adding tank 13, then the sixth stop valve 11 is opened to convey the lubricating liquid in the liquid adding tank 13 into the autoclave 10 to be mixed with supercritical carbon dioxide; the conveying of the lubricating liquid is controlled through the two stop valves, so that the conveying precision is improved, and the phenomenon that excessive lubricating liquid cannot be fully mixed with supercritical carbon dioxide to influence the lubricating effect due to the fact that the excessive lubricating liquid is conveyed into the high-pressure kettle 10 is avoided.
Referring to fig. 1, a third relief valve and a third exhaust valve 17 are also connected to the supercritical carbon dioxide storage chamber. The third safety valve has the function of preventing the pressure in the autoclave 10 from being excessive and ensuring the safe operation of the device; before the nozzle 18 is opened to spray the lubricant, the third exhaust valve 17 is opened to discharge the impurity gas which is not completely mixed in the autoclave 10, and when the third exhaust valve 17 discharges the continuous pure lubricant, the nozzle 18 is opened again to ensure that the pure lubricant is sprayed at the cutting station.
Referring to fig. 2, the line between the nozzle 18 and the autoclave 10 is a metal hose 30, which allows the nozzle 18 to be moved to different positions for lubricant injection to accommodate different processing equipment and cutting stations.
Referring to fig. 2, the metal hose 30 includes a mixing portion 31 and two connection portions 32, wherein the two connection portions 32 are disposed at both ends of the mixing portion 31, respectively, and an inner cavity of the mixing portion 31 is larger than the connection portions 32. Since the inner cavity of the mixing part 31 is larger than the connecting part 32, after the lubricant gas reaches the mixing part 31 through the connecting part 32, further full mixing of the supercritical carbon dioxide and the lubricant is realized due to volume expansion; and then sprayed out through the nozzle 18, so that the mixing degree of the lubricating liquid and the supercritical carbon dioxide is improved, and the cooling and lubricating effects are improved.
Referring to fig. 1 and 2, the working principle of the low-temperature micro-lubrication device based on the supercritical carbon dioxide fluid lubricant of the present embodiment is:
When the lubricant is required to be injected in the metal processing process, the reflux valve 7, the second stop valve 29, the second exhaust valve 25 and the third stop valve 22 are opened, the delivery pump 27 works to start pressurizing and delivering the carbon dioxide gas in the carbon dioxide gas cylinder 28, and when the continuous pure carbon dioxide gas is discharged from the second exhaust valve 25, the second exhaust valve 25 is closed; at this time, the carbon dioxide gas stays between the transfer pump 27 and the fourth shut-off valve 19 temporarily, and after a while, the fourth shut-off valve 19 is opened again, so that the preheated carbon dioxide gas is transferred into the supercritical carbon dioxide storage chamber in the autoclave 10, while the carbon dioxide gas is transferred, the piston in the autoclave 10 is continuously moved toward the end of the constant pressure driving chamber while the carbon dioxide gas is being inputted, when the autoclave 10 is filled with the carbon dioxide gas, and when the parameter of the second pressure gauge 20 is raised to 20MPa, the third shut-off valve 22 and the fourth shut-off valve 19 are closed, and the transfer pump 27 stops transferring the carbon dioxide gas; under the action of the carbon dioxide gas in the autoclave 10, namely under the specific pressure and temperature, supercritical carbon dioxide is gradually formed, meanwhile, a lubricant supply device supplies a trace amount of lubricant into a supercritical carbon dioxide storage cavity, and the trace amount of lubricant is absorbed by the supercritical carbon dioxide under the constant temperature and pressure, and the supercritical carbon dioxide and the lubricant are uniformly mixed together; subsequently, the reflux valve 7 is closed, the first exhaust valve 4 is opened, the oil pump 2 is operated, when the first exhaust valve 4 discharges continuous and pure oil, the first exhaust valve 4 is closed, the first stop valve 6 is opened, so that the oil in the oil tank 1 is conveyed into a constant-pressure driving cavity in the autoclave 10, when the parameter in the first pressure gauge 8 rises to 20MPa, the nozzle 18 is opened, so that the supercritical carbon dioxide in the supercritical carbon dioxide storage cavity is sprayed out, and meanwhile, the oil pump 2 continuously and stably conveys the oil into the constant-pressure driving cavity, so that the pressure in the constant-pressure driving cavity is kept unchanged; since the pressure in the constant pressure driving chamber is maintained constant and the external atmospheric pressure communicating with the nozzle 18 is also maintained constant, the lubricant can be continuously and uniformly injected through the nozzle 18 by the oil and the piston.
If another lubricating liquid needs to be added into the autoclave 10, after the carbon dioxide gas is conveyed, opening a fifth stop valve 14, flowing a proper amount of lubricating liquid into a liquid adding groove 13, opening a sixth stop valve 11, and draining a proper amount of lubricating liquid into the autoclave 10; the lubricating fluid is thoroughly mixed with supercritical carbon dioxide in the autoclave 10, and then the oil is continuously fed into the constant-pressure driving chamber through the oil pump 2 for subsequent injection.
Example 2
Referring to fig. 3, this embodiment is different from embodiment 1 in that: the metal hose comprises two mixing parts 31 and three connecting parts 32, wherein the mixing parts 31 and the connecting parts 32 are alternately connected, and the inner cavity of the mixing part 31 is larger than the connecting parts 32, so that supercritical carbon dioxide and lubricating liquid can be more fully mixed together, and lubrication and effects are improved.
Example 3
Referring to fig. 4, this embodiment is different from embodiment 2 in that: a spiral tube 33 is connected in front of the nozzle 18. The function is as follows: the spiral pipe 33 has a spiral passage through which supercritical carbon dioxide and lubricant pass before being ejected, and the flow direction is continuously changed during the spiral flow, so that further mixing of the supercritical carbon dioxide and the lubricant is facilitated, and the cooling and lubrication effects are further improved.
The foregoing is illustrative of the present invention, and is not to be construed as limiting thereof, but rather as various changes, modifications, substitutions, combinations, and simplifications which may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. The low-temperature micro-lubrication device based on the supercritical carbon dioxide fluid lubricant comprises an autoclave with a heating function, a carbon dioxide gas cylinder with carbon dioxide gas, a carbon dioxide pressurizing and conveying device for pressurizing and conveying carbon dioxide in the carbon dioxide gas cylinder into the autoclave, and a nozzle for conveying supercritical carbon dioxide in the autoclave to a cutting station, and is characterized in that a piston is arranged in the autoclave to divide an inner cavity of the autoclave into a supercritical carbon dioxide storage cavity and a constant-pressure driving cavity, wherein the supercritical carbon dioxide storage cavity is connected with the carbon dioxide pressurizing and conveying device and the nozzle, and the constant-pressure driving cavity is connected with a constant-pressure device capable of introducing a constant-pressure medium into the constant-pressure driving cavity; the supercritical carbon dioxide storage cavity is also connected with a lubricant supply device for feeding a trace amount of lubricant;
The constant pressure medium in the constant pressure device is oil, the constant pressure device comprises an oil tank for storing the oil, an oil pump for conveying the oil in the oil tank to the constant pressure driving cavity through a pipeline, a controller for controlling the oil pump to work and a pressure detector for monitoring the pressure of a supercritical carbon dioxide storage cavity in the high-pressure kettle in real time, the pressure detector sends the pressure of the supercritical carbon dioxide storage cavity to the controller in real time, and the controller controls the oil pump to work according to the real-time pressure monitored by the pressure detector and the set pressure of the supercritical carbon dioxide storage cavity;
The carbon dioxide pressurizing and conveying device comprises a conveying pump for conveying carbon dioxide gas in a carbon dioxide gas cylinder into the autoclave through a pipeline and a preheater arranged on the pipeline;
The carbon dioxide pressurizing and conveying device is used for pressurizing and conveying carbon dioxide gas in a carbon dioxide gas cylinder into a supercritical carbon dioxide storage cavity in the high-pressure kettle, a piston in the high-pressure kettle continuously moves towards the end part of the constant-pressure driving cavity while inputting the carbon dioxide gas, and when the high-pressure kettle is filled with the carbon dioxide gas, the piston moves to the end part of the constant-pressure driving cavity; the supercritical carbon dioxide is gradually formed under the specific pressure and temperature in the autoclave, and meanwhile, the lubricant supply device supplies a trace amount of lubricant into the supercritical carbon dioxide storage cavity, and the trace amount of lubricant is absorbed by the supercritical carbon dioxide under the constant temperature and pressure, and the supercritical carbon dioxide and the lubricant are uniformly mixed together; the constant pressure device conveys constant pressure medium to a constant pressure driving cavity in the autoclave, so that the piston moves towards the supercritical carbon dioxide storage cavity under the action of the constant pressure medium, and the pressure formed in the constant pressure driving cavity and the supercritical carbon dioxide storage cavity is the same; the during operation opens the nozzle for the supercritical carbon dioxide that is arranged in supercritical carbon dioxide storage chamber sprays out, simultaneously, constant voltage device constantly carries constant voltage medium to constant voltage drive chamber, guarantees that the pressure in the constant voltage drive chamber remains unchanged.
2. The supercritical carbon dioxide-based low-temperature micro-lubrication device according to claim 1, wherein the constant pressure device further comprises a first shut-off valve provided in a pipeline between the autoclave and the oil pump and a return valve connected in parallel with the oil pump through the pipeline; a first safety valve and a first exhaust valve are arranged at the outlet of the oil pump, and a first check valve is arranged between the first exhaust valve and the first stop valve; the return valve is connected in parallel with the oil pump, the first relief valve, the first exhaust valve, and the first check valve.
3. The supercritical carbon dioxide-based cryogenic micro-lubrication device of claim 1, wherein the carbon dioxide pressurized delivery device further comprises a second shut-off valve disposed between a carbon dioxide cylinder and a delivery pump and a switching valve disposed between the delivery pump and an autoclave; the switch valve comprises a third stop valve and a fourth stop valve; along the conveying direction of the carbon dioxide gas, the third stop valve, the preheater and the fourth stop valve are sequentially arranged on pipelines of the conveying pump and the autoclave.
4. A low temperature micro-lubrication device for supercritical carbon dioxide according to claim 3, wherein a second safety valve and a second exhaust valve are arranged at the outlet of the delivery pump, and a second check valve is arranged between the second exhaust valve and the third stop valve; a second pressure gauge is arranged in the pipeline between the preheater and the fourth stop valve.
5. A cryogenic micro-lubrication system based on supercritical carbon dioxide as claimed in any one of claims 1 to 4, wherein the lubricant supply means comprises a reservoir and a charging tank arranged between the reservoir and the supercritical carbon dioxide storage chamber; a fifth stop valve is arranged between the liquid storage tank and the liquid adding tank, and a sixth stop valve is arranged between the liquid adding tank and the supercritical carbon dioxide storage cavity.
6. A cryogenic micro-lubrication device based on supercritical carbon dioxide according to any of claims 1-4, wherein the conduit between the nozzle and the autoclave is a metal hose.
7. The cryogenic micro-lubrication device based on supercritical carbon dioxide according to claim 6, wherein the metal hose comprises a mixing part and connecting parts arranged at two ends of the mixing part, and an inner cavity of the mixing part is larger than the connecting parts.
8. The low-temperature micro-lubrication device based on supercritical carbon dioxide according to claim 7, wherein a spiral pipe is connected in front of the nozzle.
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| CN109174486B (en) * | 2018-10-09 | 2024-09-24 | 汇专科技集团股份有限公司 | Low-temperature processing nozzle |
| CN109318044A (en) * | 2018-10-29 | 2019-02-12 | 广州汇专工具有限公司 | A kind of supercritical carbon dioxide supply regulator control system |
| CN109520192B (en) * | 2018-12-03 | 2024-03-22 | 汇专科技集团股份有限公司 | Supercritical carbon dioxide cooling system and control method thereof |
| CN110756903B (en) * | 2019-11-04 | 2021-12-31 | 深圳市普林司顿模具塑胶有限公司 | Processing equipment for improving processing precision of injection mold and processing technology thereof |
| CN114473623A (en) * | 2021-12-31 | 2022-05-13 | 安徽天航机电有限公司 | Cooling and lubricating method for high-temperature alloy GH2132 aviation sleeve efficient cutting machining process |
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Address after: 510665 293 Zhongshan Avenue, Tianhe District, Guangzhou, Guangdong. Applicant after: GUANGDONG POLYTECHNIC NORMAL University Address before: 510665 293 Zhongshan Avenue, Tianhe District, Guangzhou, Guangdong. Applicant before: GUANGDONG POLYTECHNIC NORMAL University |
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Application publication date: 20180626 Assignee: HEYUAN LANHAI MIKE MOULD CUTTER Co.,Ltd. Assignor: GUANGDONG POLYTECHNIC NORMAL University Contract record no.: X2024980009113 Denomination of invention: A low-temperature micro lubrication device based on supercritical carbon dioxide Granted publication date: 20240419 License type: Common License Record date: 20240708 |
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