High-pressure carbon dioxide cooling and lubrication system based on high-pressure graded utilization

Abstract

The present invention provides a high-pressure carbon dioxide cooling and lubrication system based on high-pressure staged utilization. The present invention includes a carbon dioxide gas cylinder, a temperature controller, a mixer, a sealed cutting fluid container connected to the mixer, and a buffer unit connected and disposed between the carbon dioxide gas cylinder and the mixer. The sealed cutting fluid container is used to inject cutting fluid into the mixer, the carbon dioxide gas cylinder is used to inject carbon dioxide into the mixer, the mixer sprays lubricating medium through a nozzle, and the temperature controller is used to heat the buffer unit and the mixer respectively. The lubricating medium includes cutting fluid and / or carbon dioxide, thereby providing a cooling and lubrication system that does not use a high-pressure pump, is easy to maintain, and has low energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide minimal lubrication, and in particular to a high-pressure carbon dioxide cooling and lubrication system based on high-pressure graded utilization. Background Art

[0002] Minimum quantity lubrication (MQL) technology combines the advantages of both dry cutting and traditional wet cutting: on the one hand, MQL reduces the amount of cutting fluid to a trace level, which not only significantly reduces the cost of cutting fluid use, but also greatly reduces the harm of cutting fluid to the environment and human body by using highly naturally degradable synthetic esters as lubricants; on the other hand, compared with dry cutting, MQL introduces a cooling lubricating medium, which greatly improves the cooling and lubrication conditions of the cutting process, significantly reduces the wear between the tool, workpiece and chips, helps to reduce cutting forces, cutting temperatures and tool wear, and improves processing quality. This cutting technology, also known as semi-dry cutting or oil-gas mixed lubrication, has great prospects under the influence of the green and environmental protection theme in the 21st century.

[0003] CO2 minimal lubrication uses a very small amount of cutting fluid, which is mixed with CO2 and vaporized to form a mist containing micron-sized oil droplets, O2 dry ice particles, and gaseous CO2. This is then sprayed through a nozzle at high speed onto the cutting area, enhancing the cooling and lubrication effect. Because CO2 pressure is adjustable, supercritical CO2 minimal lubrication can be achieved when it reaches a supercritical state. Currently, domestic research on CO2 minimal lubrication is in its infancy, requiring the use of high-pressure pumps to raise the medium pressure to a high pressure state. However, the use of high-pressure pumps can lead to increased costs, increased energy consumption, and subsequent maintenance issues. Summary of the Invention

[0004] In view of this, the present invention aims to propose a high-pressure carbon dioxide cooling and lubrication system based on high-pressure graded utilization, so as to provide a cooling and lubrication system that does not use a high-pressure pump, is easy to maintain, and has low energy consumption.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A high-pressure carbon dioxide cooling and lubrication system based on high-pressure graded utilization, comprising a carbon dioxide cylinder, a temperature controller, a mixer, a closed cutting fluid container connected to the mixer, and a buffer unit connected and arranged between the carbon dioxide cylinder and the mixer; the closed cutting fluid container is used to inject cutting fluid into the mixer, the carbon dioxide cylinder is used to inject carbon dioxide into the mixer, the mixer sprays lubricating medium through a nozzle, and the temperature controller is used to heat the buffer unit and the mixer respectively; the lubricating medium includes the cutting fluid and / or the carbon dioxide.

[0007] Furthermore, the buffer unit includes a fifth pressure device, a first valve, a fourth pressure device, a self-cooling buffer tank, a second valve, a secondary buffer tank, a first pressure device and a third valve, which are sequentially connected in series between the output end of the carbon dioxide cylinder and the mixer through a pipeline.

[0008] Furthermore, a precooler and a cooler are sequentially provided along the flow direction from the first valve to the fourth pressure vessel.

[0009] Furthermore, it also includes a cooling pipeline, a recovery pipeline, a tenth valve installed on the cooling pipeline, and an eleventh valve installed on the recovery pipeline. One end of the cooling pipeline is connected to the precooler, and the other end is connected to the interior of the self-cooling buffer tank. One end of the recovery pipeline is connected to the pipeline connecting the tenth valve and the self-cooling buffer tank, and the other end is connected to the interlayer of the self-cooling buffer tank.

[0010] Furthermore, the cutting fluid sealed container is connected to the secondary buffer tank through a pipeline, and a fourth valve is installed on the pipeline connecting the cutting fluid sealed container and the secondary buffer tank.

[0011] Furthermore, the mixer includes a vessel for holding the lubricating medium, a second pressure device with a detection end installed inside the vessel, and an electromagnetic stirrer with a stirrer arranged at the bottom of the vessel. The cutting fluid closed container is connected to the vessel through a pipeline, and a fifth valve is installed on the pipeline.

[0012] Furthermore, the nozzle is connected to the interior of the vessel through an ejection pipeline, the ejection pipeline is Y-shaped, a ninth valve is installed on the merging section of the ejection pipeline, and the bifurcated section of the ejection pipeline is divided into a carbon dioxide pipeline installed with a seventh valve, and a cutting fluid pipeline installed with an eighth valve. The carbon dioxide pipeline extends into the upper part of the vessel near the end of the vessel, and the cutting fluid pipeline extends into the bottom of the vessel near the end of the vessel.

[0013] Furthermore, a first thermometer is installed between the self-cooling buffer tank and the second valve, and a second thermometer is installed between the secondary buffer tank and the third valve.

[0014] Furthermore, the mixer further comprises a third thermometer with a detection end arranged inside the vessel.

[0015] Furthermore, it also includes a third pressure device and a liquid inlet pipe installed with a sixth valve. The third pressure device is installed between the cutting fluid closed container and the secondary buffer tank, and the liquid inlet pipe is connected to the cutting fluid closed container.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The present invention is a cooling and lubrication system that does not use a high-pressure pump for pressurization. Compared with the cost, energy consumption and maintenance of the high-pressure pump, the present invention is based on the principle that the pressure of carbon dioxide can be increased by heating carbon dioxide gas in a confined space. A temperature controller is used to heat the self-cooling buffer tank, the secondary buffer tank and the mixer to achieve the pressure difference among the three. The system as a whole uses pressure changes to make the lubricating medium reach the required pressure and spray it through the nozzle. Compared with the use of a high-pressure pump, the cost is lower, the energy consumption is low, and the maintenance is convenient.

[0018] Secondly, the lubricating medium sprayed through the nozzle can be freely selected, and three different lubricating media can be provided according to actual conditions. The first is a lubricating medium rich in carbon dioxide, the second is a lubricating medium rich in cutting fluid, and the third is a lubricating medium mixed with carbon dioxide and cutting fluid.

[0019] Furthermore, the secondary buffer tank and the self-cooling buffer tank can realize graded utilization of carbon dioxide pressure, and the self-cooling buffer tank can realize rapid cooling after the carbon dioxide gas temperature is too high. Carbon dioxide gas can be quickly filled into the self-cooling buffer tank to maintain the continuous supply of high-pressure system pressure.

[0020] Finally, a precooler and a cooler are provided to cool the carbon dioxide gas charged into the system so that the carbon dioxide gas maintains a normal pressure when entering the system. By connecting the self-cooling buffer tank with the precooler, the self-cooling buffer tank can also be quickly cooled by the precooler and the cooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention. Terms such as front and back, top and bottom, etc., used therein are intended only to indicate relative positional relationships and do not constitute undue limitations on the present invention. In the accompanying drawings:

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Description of reference numerals:

[0024] 1. Carbon dioxide cylinder; 2. Temperature controller; 3. Cutting fluid sealed container; 4. Nozzle; 5. Fifth pressure gauge; 6. First valve; 7. Fourth pressure gauge; 8. Self-cooling buffer tank; 9. Second valve; 10. Secondary buffer tank; 11. First pressure gauge; 12. Third valve; 13. Precooler; 14. Cooler; 15. Cooling pipeline; 16. Recovery pipeline; 17. Tenth valve; 18. Eleventh valve; 19. Fourth valve; 20. Vessel; 21. Second pressure gauge; 22. Stirring bar; 23. Electromagnetic stirrer; 24. Fifth valve; 25. Merging section; 26. Ninth valve; 27. Seventh valve; 28. Carbon dioxide pipeline; 29. ​​Eighth valve; 30. Cutting fluid pipeline; 31. First temperature gauge; 32. Second temperature gauge; 33. Third temperature gauge; 34. Third pressure gauge; 35. Sixth valve. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0026] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", and "back" appear to indicate orientation or positional relationships, they are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; if terms such as "first" and "second" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] Furthermore, in the description of the present invention, unless otherwise expressly defined, the terms "mounted," "connected," "connect," and "connector" should be interpreted broadly. For example, a connection can be a fixed connection, a removable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0029] This embodiment relates to a high-pressure carbon dioxide cooling and lubrication system based on high-pressure graded utilization, providing a cooling and lubrication system that does not use a high-pressure pump, is easy to maintain, and has low energy consumption; an exemplary structure thereof is as follows Figure 1 shown.

[0030] In general, the high-pressure carbon dioxide cooling and lubrication system based on high-pressure graded utilization includes a carbon dioxide cylinder 1, a temperature controller 2, a mixer, a cutting fluid sealed container 3 connected to the mixer, and a buffer unit connected and arranged between the carbon dioxide cylinder 1 and the mixer; the cutting fluid sealed container 3 is used to inject cutting fluid into the mixer, the carbon dioxide cylinder 1 is used to inject carbon dioxide into the mixer, the mixer sprays the lubricating medium through the nozzle 4, and the temperature controller 2 is used to heat the buffer unit and the mixer respectively; the lubricating medium includes cutting fluid and / or carbon dioxide.

[0031] Cutting fluid is injected into the mixer through the cutting fluid sealed container 3, and the carbon dioxide cylinder 1 releases the carbon dioxide gas into the buffer unit, which is then injected into the mixer through the buffer unit. The temperature controller 2 is used to heat the buffer unit and the mixer respectively. Since carbon dioxide gas is injected into both the buffer unit and the mixer, the pressure inside the buffer unit and the mixer will increase during heating. At the same time, the pressure inside the buffer unit will be higher than the pressure inside the mixer during heating using the temperature controller 2. At this time, due to the pressure difference between the buffer unit and the mixer, the lubricating medium inside the mixer will be pressurized and sprayed out through the nozzle 4.

[0032] The lubricating medium sprayed out by the nozzle 4 can be divided into three types: the first type is a lubricating medium rich in carbon dioxide, the second type is a lubricating medium rich in cutting fluid, and the third type is a lubricating medium mixed with carbon dioxide gas and cutting fluid.

[0033] Specifically, the buffer unit includes a fifth pressure device 5, a first valve 6, a fourth pressure device 7, a self-cooling buffer tank 8, a second valve 9, a secondary buffer tank 10, a first pressure device 11 and a third valve 12, which are arranged in series between the output end of the carbon dioxide cylinder 1 and the mixer through a pipeline.

[0034] The mixer includes a vessel 20 for holding a lubricating medium, a second pressure device 21 with a detection end installed inside the vessel 20, and an electromagnetic stirrer 23 with a stirring rod 22 arranged at the bottom of the vessel 20. The cutting fluid sealed container 3 is connected to the vessel 20 through a pipeline, and a fifth valve 24 is installed on the pipeline.

[0035] In combination with the structure of the above-mentioned buffer unit and mixer, when using the carbon dioxide cylinder 1 to fill the buffer unit with carbon dioxide gas, the first valve 6, the second valve 9 and the third valve 12 are opened. After the carbon dioxide gas is filled into the buffer unit and the mixer, the pressure at each point in the buffer unit and the mixer is the same. Then, the self-cooling buffer tank 8, the secondary buffer tank 10 and the vessel 20 are heated respectively through the temperature controller 2, so that the value on the fourth pressure gauge 7 is greater than the value at the first pressure gauge 11, and the value at the first pressure gauge 11 is greater than the value at the second pressure gauge 21, thereby forming a pressure difference, and finally causing the lubricating medium inside the vessel 20 to be sprayed out through the nozzle 4.

[0036] There may be multiple secondary buffer tanks 10 arranged in series.

[0037] It should be noted that the essence of the temperature controller 2 heating the mixer and the buffer unit respectively is that the temperature controller 2 heats the vessel 20, the secondary buffer tank 10 and the self-cooling buffer tank 8 respectively, and wraps the outer walls of the vessel 20, the self-cooling buffer tank 8 and the secondary buffer tank 10 with a heating belt. The temperature controller 2 heats the heating belt, thereby heating the vessel 20, the self-cooling buffer tank 8 and the secondary buffer tank 10 respectively. The temperature controller 2 adopts the existing conventional technology.

[0038] In order to enable the nozzle 4 to spray three different lubricating media, a spray pipeline is set between the nozzle 4 and the inside of the vessel 20. The spray pipeline is Y-shaped. A ninth valve 26 is installed on the merging section 25 of the spray pipeline. The bifurcated section of the spray pipeline is divided into a carbon dioxide pipeline 28 installed with a seventh valve 27, and a cutting fluid pipeline 30 installed with an eighth valve 29. The carbon dioxide pipeline 28 extends into the upper part of the vessel 20 near the end of the vessel 20, and the cutting fluid pipeline 30 extends into the bottom of the vessel 20 near the end of the vessel 20.

[0039] It should be noted that the bifurcated section of the ejection pipeline is the upper half of the Y-shape, and the merging section 25 of the ejection pipeline is the lower half of the Y-shape.

[0040] First, open the fifth valve 24, and the cutting fluid sealed container 3 injects cutting fluid into the vessel 20 through the pipeline. After the cutting fluid enters the vessel 20, it will sink to the bottom of the vessel 20. Then, the carbon dioxide cylinder 1 is used to fill the vessel 20 with carbon dioxide gas through the pressure difference. The carbon dioxide gas will be filled above the liquid level of the cutting fluid. In the process of spraying the lubricating medium through the nozzle 4, the pressure inside the vessel 20 is the lowest and is always under pressure.

[0041] When the seventh valve 27 is opened alone, the carbon dioxide gas inside the container 20 will enter the merging section 25 of the ejection pipeline through the carbon dioxide pipeline 28, and then the ninth valve 26 is opened, and the carbon dioxide gas in the merging section 25 of the ejection pipeline will be ejected through the nozzle 4.

[0042] If the eighth valve 29 is opened alone, the cutting fluid at the bottom of the vessel 20 will enter the merging section 25 of the ejection pipeline through the cutting fluid pipeline 30, and then the ninth valve 26 will be opened, and the cutting fluid in the merging section 25 of the ejection pipeline will be ejected through the nozzle 4. A part of the carbon dioxide gas will be dissolved in the rich cutting fluid, and the stirring rod 22 of the electromagnetic stirrer 23 can be used to stir the bottom of the vessel 20 to add dissolved carbon dioxide gas.

[0043] At the same time, the seventh valve 27 and the eighth valve 29 are opened, and the carbon dioxide gas and cutting fluid in the vessel 20 will enter the merging section 25 of the ejection pipeline at the same time. Then the ninth valve 26 is opened, and the carbon dioxide gas and cutting fluid in the merging section 25 of the ejection pipeline will be ejected through the nozzle 4.

[0044] In order to better inject cutting fluid into the vessel 20 through the cutting fluid closed container 3, the cutting fluid closed container 3 is connected to the secondary buffer tank 10 through a pipeline, and a fourth valve 19 is installed on the pipeline connecting the cutting fluid closed container 3 and the secondary buffer tank 10.

[0045] Since the pressure at the secondary buffer tank 10 is greater than the pressure in the vessel 20, when the fifth valve 24 is opened, the fourth valve 19 needs to be opened at the same time. The carbon dioxide gas will enter the cutting fluid sealed container 3 through the fourth valve 19, making the pressure in the cutting fluid sealed container 3 equal to that in the vessel 20. The cutting fluid in the cutting fluid sealed container 3 is injected into the vessel 20 according to gravity.

[0046] Alternatively, close the third valve 12 and then open the fourth valve 19 and the fifth valve 24. At this time, the carbon dioxide gas at the secondary buffer tank 10 will enter the cutting fluid sealed container 3. At this time, the pressure in the cutting fluid sealed container 3 will be greater than the pressure in the vessel 20, thereby accelerating the speed of injecting the cutting fluid into the vessel 20.

[0047] Install a third pressure gauge 34 between the cutting fluid sealed container 3 and the secondary buffer tank 10, observe the readings on the third pressure gauge 34 and the second pressure gauge 21, and when the reading of the third pressure gauge 34 is greater than the reading of the second pressure gauge 21, open the fifth valve 24. At this time, it can be proved that the pressure in the cutting fluid sealed container 3 is greater than the pressure in the vessel 20, which facilitates the injection of cutting fluid into the vessel 20.

[0048] The cutting fluid sealed container 3 is also connected to a liquid inlet pipe, which is opened / closed by a sixth valve 35 and is used to inject cutting fluid into the cutting fluid sealed container 3 .

[0049] As for the precooler 13 and the cooler 14 , the precooler 13 and the cooler 14 are sequentially arranged along the flow direction from the first valve 6 to the fourth pressure vessel 7 .

[0050] The carbon dioxide gas coming out of the carbon dioxide cylinder 1 will first be cooled by the precooler 13 and then cooled by the cooler 14, so that the carbon dioxide entering the self-cooling buffer tank 8 maintains a normal pressure.

[0051] A cooling pipeline 15, a recovery pipeline 16, a tenth valve 17 installed on the cooling pipeline 15, and an eleventh valve 18 installed on the recovery pipeline 16 are provided, one end of the cooling pipeline 15 is connected to the precooler 13, and the other end is connected to the interior of the self-cooling buffer tank 8, one end of the recovery pipeline 16 is connected to the pipeline connecting the tenth valve 17 and the self-cooling buffer tank 8, and the other end is connected to the interlayer of the self-cooling buffer tank 8.

[0052] The above setting is adopted because after the self-cooling buffer tank 8 is heated by the thermostat 2 for a period of time, the pressure in the self-cooling buffer tank 8 will be greater than the pressure at the output end of the carbon dioxide cylinder 1, which will cause the carbon dioxide in the carbon dioxide cylinder 1 to be unable to be filled into the self-cooling buffer tank 8. Therefore, at this time, it is necessary to close the first valve 6 and the second valve 9, and then open the eleventh valve 18. A part of the carbon dioxide in the self-cooling buffer tank 8 will be discharged, and the carbon dioxide in the self-cooling buffer tank 8 will pass through the eleventh valve 18 into the interlayer of the self-cooling buffer tank 8, and then be discharged through the interlayer gap. At the same time, it can take away part of the heat of the self-cooling buffer tank 8 itself, helping the self-cooling buffer tank 8 to reduce the pressure. The discharged carbon dioxide can be recovered by installing pipelines or other containers to discharge the self-cooling buffer tank. After part of the carbon dioxide in the buffer tank 8 is discharged, a certain pressure of the self-cooling buffer tank 8 will be released, and then the eleventh valve 18 will be closed and the tenth valve 17 will be opened. The carbon dioxide in the self-cooling buffer tank 8 will enter the precooler 13 through the tenth valve 17, and then circulate to the self-cooling buffer tank 8 through the cooler 14. The carbon dioxide in the self-cooling buffer tank 8 will be cooled by the precooler 13 and the cooler 14, and the pressure in the self-cooling buffer tank 8 will be reduced. The values ​​of the fifth pressure gauge 5 and the fourth pressure gauge 7 will be observed. When the pressure of the self-cooling buffer tank 8 is equal to or less than the pressure at the carbon dioxide cylinder 1, the first valve 6 will be opened to fill the carbon dioxide in the carbon dioxide cylinder 1 into the self-cooling buffer tank 8, and then the self-cooling buffer tank 8 will be heated by the thermostat 2 to form a pressure difference.

[0053] A first thermometer 31 is installed between the self-cooling buffer tank 8 and the second valve 9 , a second thermometer 32 is installed between the secondary buffer tank 10 and the third valve 12 , and a third thermometer 33 with a detection end arranged inside the vessel 20 is installed in the mixer.

[0054] The temperature between the self-cooling buffer tank 8 and the second valve 9 can be visually seen through the first thermometer 31, the temperature between the secondary buffer tank 10 and the third valve 12 can be visually seen through the second thermometer 32, and the temperature inside the vessel 20 can be visually seen through the third thermometer 33, which makes it convenient for the staff to adjust the temperatures of the self-cooling buffer tank 8, the secondary buffer tank 10 and the vessel 20 in time.

[0055] In the above structure, multiple one-way valves are also provided. A one-way valve is installed between the cooler 14 and the self-cooling buffer tank 8 along the flow direction from the cooler 14 to the self-cooling buffer tank 8. A one-way valve is installed between the self-cooling buffer tank 8 and the secondary buffer tank 10 along the flow direction from the self-cooling buffer tank 8 to the secondary buffer tank 10. A one-way valve is installed on the merging section 25 of the discharge pipeline along the discharge direction of the lubricating medium.

[0056] The working process of the lubrication system is as follows:

[0057] Under normal conditions of the lubrication system, all valves are in a closed state. When the lubrication system needs to work, the first valve 6, the second valve 9, and the third valve 12 are opened, and the carbon dioxide in the carbon dioxide cylinder 1 will be filled into the self-cooling buffer tank 8, the secondary buffer tank 10, and the vessel 20. After a period of time, the carbon dioxide will fill the self-cooling buffer tank 8, and then the first valve 6 is closed. Then the readings on the fourth pressure gauge 7, the first pressure gauge 11, and the second pressure gauge 21 are observed. After the pressures of the three are equal, the self-cooling buffer tank 8, the secondary buffer tank 10, and the vessel 20 are heated respectively through the temperature controller 2. The pressure of the internal carbon dioxide is changed by heating. When the value on the fourth pressure gauge 7 is greater than the value on the first pressure gauge 11, and the value on the first pressure gauge 11 is greater than the value on the second pressure gauge 21, a pressure difference is formed between the self-cooling buffer tank 8, the secondary buffer tank 10, and the vessel 20.

[0058] Close the third valve 12, open the fourth valve 19 and the fifth valve 24, and the carbon dioxide in the secondary buffer tank 10 will enter the cutting fluid sealed container 3. When the value of the third pressure gauge 34 is greater than the value of the second pressure gauge 21, it proves that the pressure in the cutting fluid sealed container 3 is greater than the pressure in the vessel 20. Therefore, the cutting fluid in the cutting fluid sealed container 3 is injected into the vessel 20 due to the effect of the carbon dioxide pressure, and the cutting fluid entering the vessel 20 will fall to the bottom of the vessel 20.

[0059] When the nozzle 4 is required to spray a lubricating medium rich in carbon dioxide, the seventh valve 27 and the ninth valve 26 are opened in sequence, and the carbon dioxide in the upper part of the vessel 20 passes through the carbon dioxide pipeline 28 and the spray pipeline merging section 25 in sequence and is sprayed out through the nozzle 4.

[0060] When the nozzle 4 is required to spray a lubricating medium rich in cutting fluid, the eighth valve 29 and the ninth valve 26 are opened in sequence, and the cutting fluid in the lower part of the vessel 20 passes through the cutting fluid pipeline 30 and the spray pipeline merging section 25 and is sprayed out through the nozzle 4.

[0061] When the nozzle 4 is required to spray a lubricating medium mixed with carbon dioxide and cutting fluid, the seventh valve 27 and the eighth valve 29 are opened at the same time, and then the ninth valve 26 is opened. The carbon dioxide and cutting fluid will enter the spray pipeline merging section 25 through their respective pipelines and be sprayed through the nozzle 4.

[0062] When the carbon dioxide reserves in the self-cooling buffer tank 8 are insufficient, close the first valve 6 and the second valve 9, open the eleventh valve 18 to release the pressure and recover part of the carbon dioxide in the self-cooling buffer tank 8, then close the eleventh valve 18, open the tenth valve 17, and the carbon dioxide gas in the self-cooling buffer tank 8 circulates to the self-cooling buffer tank 8 through the precooler 13 and the cooler 14. The carbon dioxide in the self-cooling buffer tank 8 is cooled and the pressure is reduced by the precooler 13 and the cooler 14. Check the values ​​of the fifth pressure gauge 5 and the fourth pressure gauge 7. After the value of the fourth pressure gauge 7 is less than or equal to the value of the fifth pressure gauge 5, open the first valve 6 to fill the self-cooling buffer tank 8 through the carbon dioxide cylinder 1, and then heat the self-cooling buffer tank 8 through the temperature controller 2, and finally form a pressure difference so that the nozzle 4 can spray the lubricating medium.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-pressure carbon dioxide cooling and lubrication system based on high-pressure graded utilization, characterized by: The invention comprises a carbon dioxide gas cylinder (1), a temperature controller (2), a mixer, a cutting fluid sealed container (3) connected to the mixer, and a buffer unit connected and arranged between the carbon dioxide gas cylinder (1) and the mixer; The cutting fluid sealed container (3) is used to inject cutting fluid into the mixer, the carbon dioxide gas cylinder (1) is used to inject carbon dioxide into the mixer, the mixer sprays lubricating medium through the nozzle (4), and the temperature controller (2) is used to heat the buffer unit and the mixer respectively, and when the temperature controller is heated, the pressure in the buffer unit is higher than the pressure in the mixer; The lubricating medium includes the cutting fluid and / or the carbon dioxide; The mixer comprises a container (20) for containing the lubricating medium, the nozzle (4) is connected to the interior of the container (20) through a spraying pipeline, the spraying pipeline is Y-shaped, and the bifurcated section of the spraying pipeline is divided into a carbon dioxide pipeline (28) installed with a seventh valve (27), and a cutting fluid pipeline (30) installed with an eighth valve (29), and the cutting fluid pipeline (30) extends into the bottom of the container (20) at the end close to the container (20).

2. The high-pressure carbon dioxide cooling and lubrication system based on high-pressure staged utilization according to claim 1 is characterized in that: The buffer unit comprises a fifth pressure device (5), a first valve (6), a fourth pressure device (7), a self-cooling buffer tank (8), a second valve (9), a secondary buffer tank (10), a first pressure device (11), and a third valve (12) which are sequentially connected in series between the output end of the carbon dioxide cylinder (1) and the mixer through a pipeline.

3. The high-pressure carbon dioxide cooling and lubrication system based on high-pressure staged utilization according to claim 2, characterized in that: A precooler (13) and a cooler (14) are sequentially arranged along the flow direction from the first valve (6) to the fourth pressure device (7).

4. The high-pressure carbon dioxide cooling and lubrication system based on high-pressure staged utilization according to claim 3 is characterized in that: The invention also includes a cooling pipeline (15), a recovery pipeline (16), a tenth valve (17) installed on the cooling pipeline (15), and an eleventh valve (18) installed on the recovery pipeline (16); one end of the cooling pipeline (15) is connected to the precooler (13), and the other end is connected to the interior of the self-cooling buffer tank (8); one end of the recovery pipeline (16) is connected to the pipeline connecting the tenth valve (17) and the self-cooling buffer tank (8), and the other end is connected to the interlayer of the self-cooling buffer tank (8).

5. The high-pressure carbon dioxide cooling and lubrication system based on high-pressure staged utilization according to claim 2 or 3, characterized in that: The cutting fluid sealed container (3) is in communication with the secondary buffer tank (10) via a pipeline, and a fourth valve (19) is installed on the pipeline connecting the cutting fluid sealed container (3) and the secondary buffer tank (10).

6. The high-pressure carbon dioxide cooling and lubrication system based on high-pressure staged utilization according to claim 1 is characterized in that: The mixer comprises a second pressure device (21) with a detection end installed inside the vessel (20), and an electromagnetic stirrer (23) with a stirring rod (22) arranged at the bottom of the vessel (20). The cutting fluid sealed container (3) is connected to the vessel (20) through a pipeline, and a fifth valve (24) is installed on the pipeline.

7. The high-pressure carbon dioxide cooling and lubrication system based on high-pressure staged utilization according to claim 6, characterized in that: A ninth valve (26) is installed on the merging section (25) of the ejection pipeline, and the carbon dioxide pipeline (28) extends into the upper inner portion of the vessel (20) at the end close to the vessel (20).

8. The high-pressure carbon dioxide cooling and lubrication system based on high-pressure staged utilization according to claim 2, characterized in that: A first thermostat (31) is installed between the self-cooling buffer tank (8) and the second valve (9), and a second thermostat (32) is installed between the secondary buffer tank (10) and the third valve (12).

9. The high-pressure carbon dioxide cooling and lubrication system based on high-pressure staged utilization according to claim 6, characterized in that: The mixer further comprises a third thermometer (33) whose detection end is arranged inside the vessel (20).

10. The high-pressure carbon dioxide cooling and lubrication system based on high-pressure staged utilization according to claim 5, characterized in that: It also includes a third pressure device (34) and a liquid inlet pipe equipped with a sixth valve (35), wherein the third pressure device (34) is installed between the cutting fluid sealed container (3) and the secondary buffer tank (10), and the liquid inlet pipe is connected to the cutting fluid sealed container (3).

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