Low-temperature minimal quantity lubrication system

Abstract

The invention discloses a low-temperature minimal quantity lubrication system, and relates to the technical field of mixers, the low-temperature minimal quantity lubrication system comprises an oil box, a cooling medium nozzle and an atomization oil nozzle, one end of the oil box is used for being communicated with an oil mist source, the other end of the oil box is communicated with the atomization oil nozzle, and the atomization oil nozzle can spray oil mist all around. The cooling medium nozzle is arranged around the atomization oil nozzle, spraying holes of the cooling medium nozzle face the atomization oil nozzle, the cooling medium nozzle is used for spraying a cooling medium to cool the surrounding environment, and oil mist sprayed out of the atomization oil nozzle can be mixed with the cooling medium sprayed out of the cooling medium nozzle. A cooling medium is sprayed out around the atomizing oil nozzle through the cooling medium nozzle, oil mist and the cooling medium are fully mixed, the mixing efficiency and uniformity of the oil mist and the cooling medium are effectively improved, and the cutting process effect of a cutter and a workpiece is enhanced; meanwhile, the temperature of mixed components is reduced, oil mist can be prevented from deteriorating due to high temperature, and the cooling and lubricating process effect is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mixers, in particular to a low-temperature minimal lubrication system. Background Art

[0002] Minimal Quantity Lubrication (MQL) is a popular quasi-dry cutting method. It uses a small amount of pollution-free oil mist mixed into compressed gas to cool, lubricate, and remove chips at the cutting point, replacing the need for large amounts of lubricants. A cryogenic cutting system (using liquid nitrogen, cold air, or a cooling medium) delivers a cooling medium to the cutting zone, significantly reducing the temperature and inducing low-temperature brittleness in the material being machined, making the cutting process easier. Currently, MQL cutting fully utilizes the lubricating properties of the lubricant, but it cannot effectively reduce the temperature in the cutting zone. This is especially true when cutting difficult-to-machine materials at high speeds, causing the cutting zone temperature to rise rapidly, resulting in a sharp drop in the lubricant's lubricity and deteriorating machining performance. Cryogenic media only reduce the cutting zone temperature, but their lubrication performance is significantly inferior to that of specific lubricants. Therefore, combining cryogenic cutting with MQL is the most effective cooling and lubrication method for cutting processes today. The effective implementation of this hybrid technology can significantly improve product quality and optimize production processes.

[0003] In traditional technology, a simple pipeline mixing method is often used to achieve mixing of cooling medium and oil mist. That is, the cooling medium and oil mist are introduced into the same mixing space through their respective pipelines, and the mixing is achieved by natural diffusion of the two. However, the traditional mixing, filtration and transportation control methods have obvious shortcomings. The simple pipeline mixing method leads to low mixing efficiency of the cooling medium and oil mist, making it difficult to fully exert the synergistic effect of the two, which in turn affects the subsequent process effects, makes it difficult to meet the requirements for oil mist mixing supply, and cannot adapt to complex and changing working scenarios. Summary of the Invention

[0004] The purpose of the present invention is to provide a low-temperature minimal lubrication system to solve the problems existing in the above-mentioned prior art, so that the mixing operation of the cooling medium and the oil mist is convenient and the mixing efficiency and uniformity are improved.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a low-temperature minimal lubrication system, comprising an oil box, a cooling medium nozzle and an atomizing oil nozzle, wherein one end of the oil box is used to be connected to an oil mist source, and the other end of the oil box is connected to the atomizing oil nozzle, and the atomizing oil nozzle can spray oil mist in all directions, the cooling medium nozzle is arranged around the atomizing oil nozzle, and the spray holes of the cooling medium nozzle are all facing the atomizing oil nozzle, the cooling medium nozzle is used to spray cooling medium to cool the surrounding environment, and can mix the oil mist sprayed by the atomizing oil nozzle with the cooling medium sprayed by the cooling medium nozzle.

[0007] Preferably, an oil tank is provided at one end of the oil box and an oil mist channel is provided at the other end. One end of the oil box is used to communicate with the oil mist source, the other end of the oil tank is connected to one end of the oil mist channel, and the other end of the oil mist channel is connected to the atomizing oil nozzle.

[0008] Preferably, the oil box and the oil mist channel are both arranged in the oil box, and the atomizing oil nozzle is fixedly connected to the oil mist channel through an oil pipe thread.

[0009] Preferably, the oil tank is connected to the oil mist source through an oil inlet pipe, a valve is provided on the oil inlet pipe, the oil inlet pipe is connected to the oil mist collector, and the oil mist collector is used to provide the oil mist source; the oil mist collector is provided with an air inlet pipe connected to the air and a liquid inlet pipe connected to the oil, the air inlet pipe is provided with an air flow regulating valve, and the liquid inlet pipe is provided with an oil inlet regulating valve; the valve is an electromagnetic valve or an electric valve.

[0010] Preferably, at least one set of filter screen components is provided in the oil box along the oil mist flow path.

[0011] Preferably, the filter assembly comprises a rectangular filter box, one side of the rectangular filter box is a flow port, and the other side is provided with a filter screen, the flow port and the filter screen are arranged opposite to each other and are located on the oil mist flow path.

[0012] Preferably, the filter screen assembly is provided in three groups in sequence, the flow ports of adjacent rectangular filter boxes are connected to the side panels with the filter screens, and the width of the rectangular filter boxes gradually decreases from the inlet to the outlet of the oil mist, and the shape of the oil tank matches the shape of the filter screen assembly.

[0013] Preferably, the size and mesh size of the filter screen on the rectangular filter box gradually decrease along the direction from the inlet to the outlet of the oil mist.

[0014] Preferably, the top of the rectangular filter box is open and flush with the top surface of the oil bin, the side walls of the rectangular filter box are fixed in the oil bin by bolts, and the oil bin is sealed with a bin cover by bolts.

[0015] Preferably, the cooling medium nozzle includes an air supply pipe and an annular nozzle, one end of the air supply pipe is fixedly connected to the oil box, and the other end is connected to the annular nozzle, the annular nozzle is sleeved outside the atomizing fuel nozzle, and a hollow annular cavity is provided inside the annular nozzle, the annular cavity is connected to the air supply pipe, and a plurality of spray holes are evenly distributed on the inner side wall of the annular cavity, and the spray holes are evenly distributed along the circumference of the atomizing fuel nozzle.

[0016] Preferably, there are two air supply pipes and they are symmetrically arranged on both sides of the annular nozzle. The air supply pipes are metal hard pipes. The ends of the air supply pipes are connected to the cooling medium, and the cooling medium is liquefied carbon dioxide. The cooling medium is connected to the air supply pipes through a pressurized liquefaction device. The pressurized liquefaction device includes a booster pump, a cooling medium tank and a pressure gauge. The booster pump is provided with a cooling medium inlet, a cooling medium outlet and a compressed air inlet. The cooling medium inlet is connected to the cooling medium tank, and the cooling medium inlet and outlet and the compressed air inlet are respectively connected to the two cavities of the booster pump. A pressure gauge and a flow meter are provided on the cooling medium outlet, and a control switch is provided on the booster pump.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] The present invention allows the cooling medium to be sprayed around the atomizing oil nozzle through the cooling medium nozzle, and the gas flows and forms a local low-pressure area nearby. According to the Bernoulli principle, the oil mist is sucked into the low-pressure area and fully mixed with the cooling medium, which effectively improves the mixing efficiency and uniformity of the two, and helps to enhance the cutting process effect of the tool and the workpiece; the mixing of the cooling medium and the oil mist reduces the temperature of the mixed components, prevents the oil mist from deteriorating due to high temperature, ensures the quality of the oil mist, and effectively improves the cooling and lubrication process effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 The structure of the low-temperature minimal lubrication system in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0021] Figure 2 The structure of the low-temperature minimal lubrication system in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0022] Figure 3The structure of the low-temperature minimal lubrication system in the embodiment of the present invention is shown in FIG. Figure 3 ;

[0023] Figure 4 Schematic diagram of the internal structure of a rectangular filter box in an embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the structure of the lubricator in an embodiment of the present invention;

[0025] Figure 6 This is a schematic structural diagram of a pressurized liquefaction device according to an embodiment of the present invention;

[0026] In the figure: 1- oil box, 2- atomizing fuel nozzle, 3- oil tank, 4- oil inlet pipe, 5- valve, 6- rectangular parallelepiped filter box, 7- tank cover, 8- bolt hole, 9- bolt, 10- filter screen, 11- annular nozzle, 12- air supply pipe, 13- pressurized liquefaction equipment, 14- oil mist collector, 15- air inlet pipe, 16- liquid inlet pipe, 17- oil mist outlet, 18- air flow regulating valve, 19- oil inlet regulating valve, 20- compressed air inlet, 21- boost pump, 22- cooling medium inlet, 23- cooling medium outlet, 24- control switch, 25- pressure gauge, 26- flow meter, 27- oil pipeline. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] It should be noted that, in the description of the present invention, the terms "upper", "lower", "left", "right", "inside", "outside", "front", "back", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0029] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0030] The purpose of the present invention is to provide a low-temperature minimal lubrication system to solve the problems existing in the prior art, making the mixing operation of the cooling medium and the oil mist convenient and improving the mixing efficiency and uniformity.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Example 1

[0033] like Figures 1 to 6 As shown, this embodiment provides a low-temperature minimal lubrication system, including an oil box 1, a cooling medium nozzle and an atomizing oil nozzle 2. One end of the oil box 1 is used to connect to the oil mist source, and the other end of the oil box 1 is connected to the atomizing oil nozzle 2. The atomizing oil nozzle 2 can spray oil mist in all directions. The cooling medium nozzle is arranged around the atomizing oil nozzle 2, and the nozzle holes of the cooling medium nozzle are all facing the atomizing oil nozzle. The cooling medium nozzle is used to spray cooling medium to cool the surrounding environment and can mix the oil mist sprayed by the atomizing oil nozzle 2 with the cooling medium sprayed by the cooling medium nozzle. The cooling medium sprayed by the cooling medium nozzle can be a phase change liquid, a liquid below -20°C or a gas. The cooling medium nozzle surrounds the atomizing oil nozzle and sprays the cooling medium. The cooling medium is fully mixed with the cooling medium, which effectively improves the mixing efficiency and uniformity of the two, and helps to enhance the cutting process effect of the tool and the workpiece; the mixing of the cooling medium and the oil mist reduces the temperature of the mixed components, which can prevent the oil mist from deteriorating due to high temperature, ensure the quality of the oil mist, and effectively improve the cooling and lubrication process effect.

[0034] As an optional solution, in this embodiment, an oil tank 3 is fixedly provided at one end of the oil box 1 and an oil mist channel is fixedly provided at the other end. One end of the oil tank 3 is used to connect with the oil mist source, the other end of the oil tank 3 is connected with one end of the oil mist channel, and the other end of the oil mist channel is connected with the atomizing fuel injector 2, thereby fixing the position of the atomizing fuel injector 2.

[0035] As an optional solution, in this embodiment, both the oil reservoir 3 and the oil mist channel are located within the oil box 1. The oil box is a solid cube with the oil reservoir 3 located in the center and the oil mist channel located at the end of the solid cube, communicating with the oil reservoir 3. The atomizing nozzle 2 is threadedly fixed to the oil mist channel via an oil delivery pipe 27, thereby securing the position of the atomizing nozzle 2. The atomizing nozzle 2 atomizes the oil in the oil box 1, converting it into tiny droplets, forming an oil mist. The atomizing nozzle 2 can be a common commercially available atomizing nozzle. The atomizing nozzle is threadedly connected to the oil delivery pipe 27, which in turn is threadedly connected to the oil mist channel.

[0036] As an optional solution, in this embodiment, the oil reservoir 3 is connected to the oil mist source via an oil inlet pipe 4. This pipe is equipped with a valve 5, which connects to the oil mist generator 14, which provides the oil mist source. Valve 5 is a solenoid valve or an electric valve. A solenoid valve installed on the outer wall of the oil pipeline precisely controls the discharge of oil from the atomizing nozzle 2. When closed, the solenoid valve immediately stops oil flow from the external pipeline; when open, it allows for smooth oil delivery, ensuring flexible and controllable oil supply to meet the needs of diverse work scenarios. Among them, the oil inlet pipe is connected to the oil mist collector 14; the oil mist collector 14 is provided with an air inlet pipe 15 connected to the air and a liquid inlet pipe 16 connected to the oil, the air inlet pipe 15 is provided with an air flow regulating valve 18, and the liquid inlet pipe 16 is provided with an oil inlet regulating valve 19. The oil intake and air pressure can be adjusted according to experimental requirements. The air intake can be increased by adjusting the air flow regulating valve 18 to adjust the air pressure; the ends of the air inlet pipe 15 and the liquid inlet pipe 16 are connected to form a pipeline, so that the oil and gas are mixed to form oil mist, and finally discharged to the oil inlet pipe 4 through the oil mist outlet 17.

[0037] As an optional solution, in this embodiment, at least one set of filter mesh components is provided along the oil mist flow path in the oil box 1 to filter the oil mist.

[0038] As an optional solution, the filter assembly in this embodiment includes a rectangular filter box 6 with an open upper end. One side of the rectangular filter box 6 is a flow port and the other side is provided with a filter screen 10. The flow port and the filter screen 10 are arranged opposite to each other and are located on the oil mist flow path, which is convenient for stacking multiple rectangular filter boxes 6.

[0039] As an optional solution, this embodiment comprises three sets of filter screen assemblies. The flow openings of adjacent rectangular filter cartridges 6 are connected to the side panels with filter screens 10. The width of the rectangular filter cartridges 6 gradually decreases from the oil mist inlet to the outlet, forming a tower-like stack. The shape of the oil reservoir 3 matches that of the filter screen assemblies. According to Bernoulli's principle, a reduction in cross-sectional area increases flow rate, while also achieving gradual pressure reduction, preventing sudden pressure changes from impacting the system and reducing energy loss.

[0040] As an optional solution, in this embodiment, the size and mesh size of the filter 10 on the rectangular filter box 6 gradually decrease from the inlet to the outlet of the oil mist. Among them, the aperture of the first-stage filter is 100 microns, which mainly filters metal particles or larger suspended solids; the aperture of the second-stage filter is 50 microns, which mainly filters smaller particles such as fine sand; the aperture of the third-stage filter is 30 microns, which mainly filters colloidal sediments produced by the oxidation of lubricating oil. The oil tank 3 at the bottom of the oil box 1 and the rectangular filter box 6, the oil box 1 and the cover plate, and the cover plate and the rectangular filter box 6 are all detachable and connected. This allows the rectangular filter box 6 to be easily disassembled and assembled, and is easy to clean. The user can regularly remove the cover plate, pull out the rectangular filter box 6 for cleaning, and clean the impurities collected on it to prevent impurities in the oil from clogging the internal channels of the oil mist bin, ensuring normal oil discharge from the atomizing nozzle 2. At the same time, the first-stage filter, the second-stage filter and the third-stage filter are arranged in sequence in the rectangular filter box 6, and the hole diameters thereof gradually become smaller, which can filter the oil three times, purify the oil solution sprayed from the atomizing nozzle 2, prevent small particles of impurities in the oil from clogging the atomizing channel, extend the service life of the equipment and reduce maintenance costs.

[0041] As an optional solution, the top of the rectangular filter cartridge 6 in this embodiment is open and flush with the top surface of the oil tank 3 to ensure the sealing of each rectangular filter cartridge 6. The side walls of the rectangular filter cartridge 6 are fixed to the oil tank 3 via bolts 9, and a tank cover 7 is sealed to the oil tank 3 via bolts 9. The rectangular filter cartridge 6 is shaped like a drawer, and the rectangular filter cartridge 6 and the tank cover 7 are connected to the oil box 1 via bolts 9. Corresponding bolt holes 8 are provided in the rectangular filter cartridge 6 and the tank cover 7.

[0042] As an optional solution, the cooling medium nozzle in this embodiment includes an air supply pipe 12 and an annular nozzle 11. One end of the air supply pipe 12 is fixedly connected to the oil box 1, and the other end is connected to the annular nozzle 11. The annular nozzle 11 is sleeved on the outside of the atomizing fuel nozzle 2. A hollow annular cavity is provided inside the annular nozzle 11, and the annular cavity is connected to the air supply pipe 12. A number of spray holes are evenly distributed on the inner wall of the annular cavity, and the spray holes are evenly distributed along the circumference of the atomizing fuel nozzle 2. The annular nozzle 11 is concentrically positioned with the atomizing nozzle 2, allowing the spray paths of the oil mist and the cooling medium to intersect, allowing for thorough mixing and cooling of the oil mist. Furthermore, the special design of the inner wall of the annular nozzle 11, which faces the opening of the atomizing nozzle 2, allows the cooling medium to be ejected at a flow rate of up to 2 L / min, resulting in a high-speed jet. The fluid flow forms a localized low-pressure region near the opening of the atomizing nozzle 2. According to Bernoulli's principle, the oil mist is drawn into this low-pressure region and thoroughly mixed with the cooling medium, effectively improving the mixing efficiency and uniformity of the two. This lays a good foundation for their combined effect in subsequent processes and helps enhance the overall cutting process. Furthermore, the cooling medium lowers the temperature of the mixed gas, preventing the oil mist from deteriorating due to high temperatures and ensuring its quality.

[0043] As an optional solution, in this embodiment, there are two air supply pipes 12 and they are symmetrically arranged on both sides of the annular nozzle 11. The air supply pipe 12 is a metal hard pipe, which has a certain supporting effect on the annular nozzle 11. The end of the air supply pipe 12 is connected to the cooling medium, which is liquefied carbon dioxide; the cooling medium is connected to the air supply pipe 12 through a pressurized liquefaction device 13. The pressurized liquefaction device 13 includes a booster pump 21, a cooling medium tank and a pressure gauge 25. The booster pump 21 is provided with a cooling medium inlet 22, a cooling medium outlet 23 and a compressed air inlet 20. The cooling medium inlet 22 is connected to the cooling medium tank, and the cooling medium inlet and outlet 23 and the compressed air inlet 20 are respectively connected to the two cavities of the booster pump 21. The booster pump 21 is provided with two piston-like chambers, one chamber is used to accommodate compressed air, and the other chamber is used to accommodate cooling medium. The cooling medium is pressurized by compressed air. A pressure gauge 25 is provided on the cooling medium outlet 23, and a control switch is provided on the booster pump 21 to control the start and close of the booster pump 21. Specifically, the cooling medium is liquefied CO2, which can come from a CO2 pressurized liquefaction device 13. The CO2 gas tank is connected to the CO2 pressurized liquefaction device 13. The flow meter 26 can be set on the air inlet pipe extending from the oil box 1 to make the flow rate of CO2 reach a set value (which can be 2L / min). If the flow rate of CO2 does not reach the set value, the booster pump needs to continue to increase the pressure to ensure the injection speed of CO2. A control switch 24 is provided on the booster pump 21. When the set air pressure is reached, the boosting pump boosting function can be turned off to maintain the pressure. Finally, the air outlet of the booster pump 21 is connected to the cooling medium nozzle through the air supply pipe 12 on the oil box 1. Usually, there is liquid CO2 in the CO2 tank. After the CO2 tank releases the CO2 gas flow, it is pressurized to 5.5MPa by the booster pump 21 to form a high-pressure and high-speed injection. The high pressure is used to keep the CO2 in a liquid state during the transportation process to prevent it from gasifying prematurely in the pipeline. Due to the large air pressure and flow rate, the CO2 injection flow rate can reach 70m / s. When the high-pressure liquid CO2 is ejected through the nozzle, the injection pressure instantly expands to normal pressure. The liquid CO2 can absorb a large amount of heat at the moment of rapid gasification. The liquid CO2 gasifies instantly and then cools the oil mist and the surrounding environment. The temperature of liquid carbon dioxide will drop sharply to about -78.5℃ at the moment of gasification. The temperature is neither too low nor too high. It can effectively cool the workpiece and the tool without affecting the performance of the tool and the workpiece, thereby improving the lubrication effect of the low-temperature oil mist on the tool after mixing.

[0044] The working principle of the low-temperature minimal lubrication system in this embodiment is as follows:

[0045] The oil solution transported from the oil tank 3 is easily filtered by providing a removable cover 7 and a rectangular filter cartridge 6. Impurities collected in the rectangular filter cartridge 6 can be removed and cleaned periodically by the user by removing the cover 7, extracting the rectangular filter cartridge 6 from the oil tank 3, and preventing impurities in the oil from clogging the internal passages of the oil tank 3 and affecting the normal discharge of the atomizing nozzle 2. Furthermore, the first-stage filter, second-stage filter, and third-stage filter, each with a gradually decreasing filter hole diameter, on the rectangular filter cartridge 6 filter the oil transported from the outside to the oil tank 3 three times, purifying the oil solution sprayed from the atomizing nozzle 2 and preventing small particles of impurities in the oil from clogging the atomizing passages of the atomizing nozzle 2. Two sets of air supply pipes 12 transport the cooling medium to the annular nozzle 11. Since the inner wall of the annular nozzle 11 is provided with a circle of nozzles facing the open end of the atomizing nozzle 2, the cooling medium is sprayed out of these nozzles at high speed. The cooling medium sprayed out at high speed forms an airflow, which will form a local low-pressure area near the open end of the atomizing nozzle 2. According to Bernoulli's principle, the pressure is low where the fluid flow rate is high, so the oil mist will be sucked into this low-pressure area and then fully mixed with the cooling medium. The outlet of the nozzle is slightly behind the outlet of the annular nozzle 11, and the cooling medium impacts the oil mist to achieve full mixing before spraying it out. At the same time, the low-temperature characteristics of the cooling medium can also reduce the temperature of the mixed gas, preventing the oil mist from deteriorating or undergoing other adverse changes due to excessive temperature. Through the special design of the annular nozzle 11 and the low-pressure area formed by the cooling medium fluid, the oil mist sprayed from the atomizing nozzle 2 can be effectively sucked in and fully mixed with the cooling medium, achieving efficient mixing of the two substances, making the mixing and cooling more uniform, and helping to improve the effect of the low-temperature lubrication of the oil mist and the cooling medium in the subsequent process.

[0046] Throughout this specification, references to terms such as "one embodiment," "certain embodiments," "illustrative embodiments," "this embodiment," "specific examples," or "some examples" indicate that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0047] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A low-temperature minimal lubrication system, characterized by: It includes an oil box, a cooling medium nozzle and an atomizing oil nozzle. One end of the oil box is used to communicate with an oil mist source, and the other end of the oil box is connected to the atomizing oil nozzle. The atomizing oil nozzle can spray oil mist in all directions. The cooling medium nozzle is arranged around the atomizing oil nozzle, and the spray holes of the cooling medium nozzle are all facing the atomizing oil nozzle. The cooling medium nozzle is used to spray cooling medium to cool the surrounding environment and can mix the oil mist sprayed from the atomizing oil nozzle with the cooling medium sprayed from the cooling medium nozzle.

2. The low-temperature minimal lubrication system according to claim 1, characterized in that: An oil tank is fixedly provided at one end of the oil box, and an oil mist channel is fixedly provided at the other end. One end of the oil box is used to communicate with an oil mist source, the other end of the oil tank is communicated with one end of the oil mist channel, and the other end of the oil mist channel is communicated with the atomizing oil nozzle.

3. The low-temperature minimal lubrication system according to claim 2, characterized in that: The oil tank and the oil mist channel are both arranged in the oil box, and the atomizing oil nozzle is fixedly connected to the oil mist channel through an oil delivery pipe.

4. The low-temperature minimal lubrication system according to claim 2, characterized in that: The oil tank is connected to the oil mist source through an oil inlet pipe, a valve is provided on the oil inlet pipe, the oil inlet pipe is connected to the oil mist collector, and the oil mist collector is used to provide the oil mist source; the oil mist collector is provided with an air inlet pipe connected to air and a liquid inlet pipe connected to oil, the air inlet pipe is provided with an air flow regulating valve, and the liquid inlet pipe is provided with an oil inlet regulating valve; the valve is an electromagnetic valve or an electric valve.

5. The low-temperature minimal lubrication system according to claim 2, characterized in that: At least one set of filter screen components is arranged inside the oil box along the oil mist flow path; the filter screen component includes a rectangular filter box, one side of the rectangular filter box is a flow port, and the other side is provided with a filter screen, the flow port is arranged opposite to the filter screen and is located on the oil mist flow path.

6. The low-temperature minimal lubrication system according to claim 5, characterized in that: The filter screen assembly is arranged in three groups in sequence, the flow ports of adjacent rectangular filter boxes are connected to the side panels with the filter screens, and the width of the rectangular filter boxes gradually decreases from the inlet to the outlet of the oil mist, and the shape of the oil tank matches the shape of the filter screen assembly.

7. The low-temperature minimal lubrication system according to claim 6, characterized in that: The size and mesh size of the filter screen on the rectangular filter box gradually decrease from the inlet to the outlet of the oil mist.

8. The low-temperature minimal lubrication system according to claim 6, characterized in that: The top of the rectangular filter box is open and flush with the top surface of the oil bin. The side walls of the rectangular filter box are fixed in the oil bin by bolts. The oil bin is sealed with a bin cover by bolts.

9. The low-temperature minimal lubrication system according to claim 1, characterized in that: The cooling medium nozzle includes an air supply pipe and an annular nozzle, one end of the air supply pipe is fixedly connected to the oil box, and the other end is connected to the annular nozzle, the annular nozzle is sleeved outside the atomizing fuel nozzle, and a hollow annular cavity is provided inside the annular nozzle, the annular cavity is connected to the air supply pipe, and a plurality of spray holes are evenly distributed on the inner side wall of the annular cavity, and the spray holes are evenly distributed along the circumference of the atomizing fuel nozzle.

10. The low-temperature minimal lubrication system according to claim 9, characterized in that: There are two air supply pipes and they are symmetrically arranged on both sides of the annular nozzle. The air supply pipes are metal hard pipes. The ends of the air supply pipes are connected to the cooling medium, and the cooling medium is liquefied carbon dioxide. The cooling medium is connected to the air supply pipes through a pressurized liquefaction device. The pressurized liquefaction device includes a booster pump, a cooling medium tank and a pressure gauge. The booster pump is provided with a cooling medium inlet, a cooling medium outlet and a compressed air inlet. The cooling medium inlet is connected to the cooling medium tank, and the cooling medium inlet and outlet and the compressed air inlet are respectively connected to the two cavities of the booster pump. The cooling medium outlet is provided with a pressure gauge and a flow meter, and the booster pump is provided with a control switch.

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