Vacuum pumping system and hydraulic station

Abstract

The utility model discloses a kind of vacuum pumping system and hydraulic station, vacuum pumping system includes vacuum generating device, pipeline assembly, filter device and gas-liquid separation device.The vacuum generating device includes air inlet end, vacuum end and air outlet end, the air inlet end is used to pass into compressed gas;The pipeline assembly includes vacuum suction pipe;One end of the filter device is connected with the vacuum suction pipe, another end of the filter device is connected with the vacuum end;The gas-liquid separation device is connected with the air outlet end.The vacuum pumping system and hydraulic station of the application can at least solve the problem of poor safety of the existing hydraulic station.

Description

Technical Field

[0001] This utility model relates to the field of precision machine tools, and more specifically, to a vacuum system and a hydraulic station. Background Technology

[0002] In related technologies, when a vacuum device creates negative pressure in a hydraulic station, it can easily extract and release oil mist from inside the station into the factory building. As hydraulic oil from the mist settles on the factory floor, it makes the floor slippery, increasing the risk of falls and posing a safety hazard. Furthermore, over time, the concentration of oil mist in the factory air increases. When the concentration reaches a certain level, it can easily explode if exposed to a source of ignition, endangering people's safety. Therefore, existing hydraulic stations pose significant safety hazards. Utility Model Content

[0003] The main purpose of this invention is to provide a vacuum system and hydraulic station, which at least solves the problem of poor safety of existing hydraulic stations.

[0004] According to one aspect of the present invention, a vacuum pumping system is provided, comprising:

[0005] A vacuum generating device, comprising an inlet end, a vacuum end, and an outlet end, wherein the inlet end is used to introduce compressed gas.

[0006] Piping assembly, the piping assembly including a vacuum suction tube;

[0007] A filtration device, one end of which is connected to the vacuum suction tube, and the other end of which is connected to the vacuum end;

[0008] A gas-liquid separation device, wherein the gas-liquid separation device is connected to the gas outlet end.

[0009] Furthermore, the vacuum generating device includes a multi-stage vacuum generator.

[0010] Furthermore, the filtration device includes a vacuum filter, which includes an air inlet, a filtrate outlet, and an air outlet; the piping assembly also includes a first piping.

[0011] The air inlet is connected to the vacuum suction pipe, the air outlet is connected to the vacuum end through the first pipe, and the filtrate outlet is used to discharge the filtrate filtered by the vacuum filter.

[0012] Furthermore, the vacuum system also includes a first control valve, and the piping assembly also includes a second pipe. The first control valve is connected to the filtrate outlet through the second pipe, and the first control valve includes an on state and a off state.

[0013] The first control valve is configured such that when the vacuum system is performing vacuuming, the first control valve is in the off state, and when the vacuum system is not performing vacuuming and the filtrate filtered by the vacuum filter needs to be discharged, the first control valve is in the on state.

[0014] Furthermore, the gas-liquid separation device includes an oil mist separator, which includes an air inlet, an exhaust outlet, and a liquid outlet. The air inlet is connected to the air outlet, the exhaust outlet is connected to the outside, and the liquid outlet is used to discharge the filtrate filtered by the oil mist separator.

[0015] Furthermore, the vacuum system also includes a second control valve, and the piping assembly also includes a third pipe. The second control valve is connected to the drain port through the third pipe, and the second control valve includes an open state and a closed state.

[0016] The second control valve is configured such that when the vacuum system is performing vacuuming, the second control valve is in a closed state, and when the vacuum system is not performing vacuuming and the filtrate separated by the oil mist separator needs to be discharged, the second control valve is in a conducting state.

[0017] Furthermore, the vacuum system also includes a pressure reducing valve, which is connected to the air inlet of the vacuum generator, and the pressure reducing valve is used at least to control the flow rate of the compressed gas flowing into the air inlet.

[0018] Furthermore, the vacuum system also includes a first pressure sensor, which is disposed at the vacuum end of the vacuum generating device, and the first pressure sensor is used at least to detect the vacuum level at the vacuum end.

[0019] On the other hand, this application also provides a hydraulic station, which is at least used to supply hydraulic oil to a predetermined machine tool. The hydraulic station includes the aforementioned vacuum system. The hydraulic station includes an oil tank, an oil supply component, and a return oil pipe. The vacuum suction pipe is connected to the oil tank to at least draw negative pressure into the oil tank. The filter outlet and drain port of the vacuum system are both connected to the oil tank to at least guide the hydraulic oil in the vacuum system to the oil tank. The oil supply component is connected between the oil tank and the predetermined machine tool to supply hydraulic oil to the predetermined machine tool. The return oil pipe is disposed between the oil tank and the predetermined machine tool to transport the hydraulic oil of the predetermined machine tool to the oil tank.

[0020] Furthermore, the hydraulic station also includes a controller;

[0021] The controller is electrically connected to both the first pressure sensor of the vacuum system and the oil supply assembly. When the first pressure sensor detects that the vacuum level at the vacuum end of the vacuum generator is less than a predetermined value, the first pressure sensor sends a signal to the controller. The controller then controls the oil supply assembly to stop supplying hydraulic oil to the predetermined machine tool based on the signal from the first pressure sensor; and / or,

[0022] The controller is electrically connected to both the first and second control valves of the vacuum system: when the vacuum system is evacuating the oil tank, the controller controls the first control valve to be in the off state and the controller controls the second control valve to be in the closed state; when the vacuum system is not evacuating the oil tank and it is necessary to discharge the hydraulic oil filtered by the vacuum system, the controller controls the first control valve to be in the on state and the controller controls the second control valve to be in the open state.

[0023] In this invention, the vacuum system achieves vacuuming functionality through the coordinated operation of a vacuum generator, piping assembly, filtration device, and gas-liquid separator. During operation, the vacuum generator uses compressed gas to create a vacuum, providing power to the entire system. The vacuum suction pipe of the piping assembly connects the space requiring vacuuming to the system, enabling it to evacuate the target space. During this process, the filtration device performs preliminary filtration of the gas in the target space. This not only prevents impurities, dust, and liquids from entering the vacuum generator and damaging it, thus extending its lifespan, but also ensures the purity of the extracted gas, improving the system's operational stability. Furthermore, because the gas-liquid separator is connected to the outlet, it can separate the gas discharged from the vacuum generator. During vacuuming, some liquid in the air within the target space is extracted along with the gas; the gas-liquid separator separates the gas and liquid, preventing the liquid from affecting subsequent equipment or the working environment of the vacuum system. If the vacuum system of this application is applied to a hydraulic station, it can prevent the hydraulic oil in the hydraulic station from being directly discharged into the air and causing an explosion, while also recovering the hydraulic oil and improving resource utilization.

[0024] In other words, compared with existing vacuum pumping devices, the vacuum pumping system of this application has a more reasonable structural design and higher safety. After the vacuum pumping system is installed in the hydraulic station, the safety of the hydraulic station can be improved, as well as the stability and reliability of the hydraulic station. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0026] Figure 1 This is a circuit diagram of the vacuum system and hydraulic station disclosed in an embodiment of the present utility model;

[0027] Figure 2 This is a structural diagram of the vacuum system and hydraulic station disclosed in the embodiments of this utility model from a first-view perspective;

[0028] Figure 3 This is a structural diagram of the vacuum system and hydraulic station disclosed in the embodiments of this utility model from a second perspective;

[0029] Figure 4 This is a structural diagram of the vacuum system and hydraulic station disclosed in the embodiments of this utility model from a third-person perspective;

[0030] Figure 5 This is a structural diagram of the vacuum system and hydraulic station disclosed in the embodiments of this utility model from a fourth-person perspective;

[0031] Figure 6 Performance curves of existing single-stage vacuum generators;

[0032] Figure 7 The diagram shows the performance curves of the multi-stage vacuum generator disclosed in this embodiment of the present invention.

[0033] The above figures include the following reference numerals:

[0034] 100. Vacuum system; 10. Vacuum generator; 11. Multi-stage vacuum generator; 111. Inlet; 112. Vacuum end; 113. Outlet; 20. Piping assembly; 21. Vacuum suction pipe; 22. First pipe; 23. Second pipe; 24. Third pipe; 30. Filtering device; 31. Vacuum filter; 311. Inlet; 312. Filtrate outlet; 313. Outlet; 40. Gas-liquid separator; 41. Oil mist separator; 411. Inlet; 412. Outlet; 413. Drain; 50. First control valve; 60. Second control valve; 70. Pressure reducing valve; 80. First pressure sensor; 200. Pre-set machine tool; 210. Oil return tank; 300. Compressor; 900. Hydraulic station ; 91. Oil tank; 911. Filler port; 912. Liquid level sensor; 913. Second shut-off valve; 914. Oil return port; 92. Oil supply assembly; 921. Oil supply pump; 9211. Motor; 9212. First pump body; 9213. Second pump body; 9214. Return pipe; 922. Filter element; 923. First check valve; 924. Second check valve; 925. Heat exchange module; 9251. First oil filter; 9252. Heat exchanger; 9253. Third check valve; 926. Oil supply module; 9261. Second oil filter; 9262. Accumulator; 9263. Second pressure sensor; 9264. First shut-off valve; 9265. Safety valve; 9266. Temperature sensor; 93. Oil return pipe; 94. Controller. Detailed Implementation

[0035] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0038] As mentioned in the background section, in related technologies, when a vacuum device applies negative pressure to a hydraulic station, it easily extracts and discharges oil mist from inside the hydraulic station into the factory building. As hydraulic oil in the oil mist deposits on the factory floor, the floor becomes slippery, increasing the risk of falls and posing a safety hazard. Furthermore, over time, the concentration of oil mist in the factory air increases. When the oil mist concentration reaches a certain level, it can easily explode upon contact with a source of ignition, endangering people's safety. Therefore, existing hydraulic stations pose significant safety hazards. To address this, this application provides a vacuum system with high safety features. Applying this system to a hydraulic station can improve its overall safety.

[0039] See Figures 1 to 7 As shown, this application provides a vacuum system 100, which includes a vacuum generator 10, a pipeline assembly 20, a filter 30, and a gas-liquid separator 40.

[0040] The vacuum generating device 10 includes an inlet end 111, a vacuum end 112, and an outlet end 113. The inlet end 111 is used to introduce compressed gas. The pipeline assembly 20 includes a vacuum suction pipe 21. One end of the filter device 30 is connected to the vacuum suction pipe 21, and the other end of the filter device 30 is connected to the vacuum end 112. The gas-liquid separation device 40 is connected to the outlet end 113.

[0041] In this application, the vacuum system 100 achieves the function of vacuuming through the coordinated operation of the vacuum generator 10, the pipeline assembly 20, the filter device 30, and the gas-liquid separator 40. In actual operation, the vacuum generator 10 uses compressed gas to create a vacuum, providing power to the entire vacuum system 100. The vacuum suction pipe 21 of the pipeline assembly 20 connects the space requiring vacuuming to the vacuum system 100, enabling the vacuum system 100 to perform evacuation operations on the target space. During this process, the filter device 30 performs preliminary filtration of the gas in the target space. This not only prevents impurities, dust, and liquids from entering the vacuum generator 10 and damaging it, thus extending its service life, but also ensures the purity of the extracted gas and improves the operational stability of the vacuum system 100. Furthermore, since the gas-liquid separator 40 is connected to the gas outlet 113, it can separate the gas discharged from the vacuum generator 10. Because some liquid is extracted along with the air in the target space during the vacuuming process, the gas-liquid separator 40 can separate the gas and liquid, preventing the liquid from affecting subsequent equipment or the working environment of the vacuum system 100. If the vacuum system 100 of this application is applied to a hydraulic station, it can prevent the hydraulic oil in the hydraulic station from being directly discharged into the air and causing an explosion, while also recovering the hydraulic oil and improving resource utilization.

[0042] In other words, compared with existing vacuum devices, the vacuum system 100 of this application has a more reasonable structural design and higher safety. After the vacuum system 100 is installed in the hydraulic station, the safety of the hydraulic station can be improved, as well as the stability and reliability of the hydraulic station.

[0043] Further, see Figures 1 to 5 , Figure 7As shown, the vacuum generating device 10 includes a multi-stage vacuum generator 11. Specifically, during actual operation, compressed gas can be introduced into the multi-stage vacuum generator 11 through the inlet 111. The compressed gas can be provided by a device such as a compressor 300; this application does not impose specific limitations. The multi-stage vacuum generator 11 can effectively improve the final achievable vacuum level by generating vacuum stage by stage. Each stage of the vacuum generator compresses and discharges gas during its operation. After multiple stages are connected in series, the vacuum level can be raised to a level that is difficult for a single-stage vacuum generator to achieve, meeting the application scenarios that require high vacuum levels. The multi-stage vacuum generator 11 can increase the pumping speed of the vacuum system 100, improve the efficiency of vacuum pumping, and reduce pumping time. By injecting compressed gas stage by stage, the multi-stage vacuum generator 11 can effectively improve the ultimate vacuum level compared to a conventional vacuum generator (i.e., a single-stage vacuum generator), thereby enabling the vacuum system 100 to meet the scenarios requiring high vacuum levels (such as precision chuck handling and semiconductor wafer picking). In other words, when the same pressure and the same airflow are introduced into the inlet 111 of the multi-stage vacuum generator 11, the multi-stage vacuum generator 11 can generate a lower pumping flow rate compared to a single-stage vacuum generator.

[0044] See Figure 6 and Figure 7It can be seen that under the same supply pressure, the multi-stage vacuum generator 11 can achieve a higher vacuum pressure. For example, when the supply pressure is 0.4 MPa, the vacuum pressure of a single-stage vacuum generator is approximately -80 kPa, while the multi-stage vacuum generator 11 can approach -90 kPa or even higher. This means that the multi-stage vacuum generator 11 can generate stronger adsorption force when adsorbing workpieces (such as semiconductor chips). For some heavy workpieces that require firm adsorption or precision operations with high vacuum requirements (such as semiconductor chip handling), the multi-stage vacuum generator 11 has a greater advantage. As the supply pressure changes, the suction flow rate of a single-stage vacuum generator increases slowly or even decreases after reaching a certain vacuum level. However, the multi-stage vacuum generator 11 not only has a higher suction flow rate over a wider supply pressure range, but also maintains relative stability. Taking an increase in supply pressure from 0.3 MPa to 0.5 MPa as an example, the suction flow rate of the multi-stage vacuum generator 11 changes little, while the suction flow rate of the single-stage vacuum generator increases only slightly or even fluctuates. This indicates that the multi-stage vacuum generator 11 performs more stably when handling large-volume air extraction needs, can quickly establish and maintain a vacuum environment, improves work efficiency, and is suitable for applications requiring rapid air evacuation, such as automated production processes like rapid material handling and sorting. Looking at the air consumption curves, the multi-stage vacuum generator 11 consumes less air when achieving similar vacuum pressures and flow rates. For example, when the vacuum pressure reaches -60 kPa, the air consumption of a single-stage vacuum generator is higher, while the air consumption of the multi-stage vacuum generator 11 is significantly lower. This means that the multi-stage vacuum generator 11 is more energy-efficient during operation, effectively reducing operating costs for enterprises, especially in automated production lines operating continuously for extended periods, where its energy-saving advantages are more pronounced. While the performance indicators of a single-stage vacuum generator fluctuate significantly with changes in supply pressure, the multi-stage vacuum generator 11 maintains relatively stable and good performance indicators such as vacuum pressure, flow rate, and air consumption within a supply pressure range of 0.2 MPa to 0.6 MPa. This indicates that the multi-stage vacuum generator 11 is more adaptable to the supply pressure and can work more stably under different gas source conditions. It does not require overly fine adjustments to the gas source, reducing the requirements for the gas supply system and improving the versatility and reliability of the equipment.

[0045] In this embodiment, a vacuum system equipped with a single-stage vacuum generator and a vacuum system 100 equipped with a multi-stage vacuum generator 11 are used to vacuum the same oil tank (not shown in the figure). In order to achieve the purpose of vacuuming, the suction flow rate from the oil tank is about 150L / min (an assumed value, mainly for subsequent comparison). The supply pressure required by the single-stage vacuum generator is about 0.4MPa, and the air consumption of the single-stage vacuum generator is about 180L / min. According to V = Q / A (where V represents the airflow velocity, Q represents the airflow rate, and A represents the flow area), at this time, the airflow velocity in the pipe connected to the air inlet of the single-stage vacuum generator (taking an 8mm air pipe with an inner diameter of 5mm as an example) is V = (180×106÷60)÷(52×3.14÷4)÷1000≈153m / s. When the suction flow rate is 150 L / min, and the supply pressure of the multi-stage vacuum generator 11 is 0.2 MPa, its suction flow rate from the oil tank reaches approximately 230 L / min. The air consumption of the multi-stage vacuum generator 11 is only 100 L / min. At this time, the airflow velocity in the pipe connected to the inlet 111 of the multi-stage vacuum generator 11 (taking an 8mm pipe with an inner diameter of 5mm as an example) is V = (100 × 10⁶ ÷ 60) ÷ (5² × 3.1⁴ ÷ 4) ÷ 1000 ≈ 85 m / s. Compared with a single-stage vacuum generator, the airflow velocity at the inlet 111 of the multi-stage vacuum generator 11 is reduced by nearly 50%, and the air consumption is reduced by nearly 45%. In pneumatic systems, the faster the airflow velocity, the louder the noise, and vice versa. The vacuum system 100 of this application uses a multi-stage vacuum generator 11 to reduce the airflow velocity by at least 50%, thereby achieving low noise. Simultaneously, the use of the multi-stage vacuum generator 11 reduces air consumption, thus lowering the energy consumption of the vacuum system 100. In actual use, if the air pressure supplied to the multi-stage vacuum generator 11 is adjusted to 0.1 MPa or even lower, the vacuum system 100 is sufficient to meet the vacuuming requirements. At this point, the airflow noise of the multi-stage vacuum generator 11 is almost inaudible, and air consumption is significantly reduced, giving the vacuum system 100 the advantages of low noise and low energy consumption.

[0046] Further, see Figures 1 to 5 As shown, the filtration device 30 includes a vacuum filter 31, which includes an air inlet 311, a filtrate outlet 312, and an air outlet 313. The pipeline assembly 20 also includes a first pipeline 22. The air inlet 311 is connected to the vacuum suction pipe 21, and the air outlet 313 is connected to the vacuum end 112 through the first pipeline 22. The filtrate outlet 312 is used to discharge the filtrate filtered by the vacuum filter 31.

[0047] Specifically, the air inlet 311 is connected to the vacuum suction pipe 21, ensuring that the mixed medium to be filtered (such as gas or gas-liquid mixture containing impurities) can smoothly enter the vacuum filter 31. The air outlet 313 is connected to the vacuum end 112 of the multi-stage vacuum generator 11 through the first pipe 22, allowing the filtered clean gas to flow smoothly to the vacuum end 112 and then enter the multi-stage vacuum generator 11. This allows for preliminary filtration of the gas entering the multi-stage vacuum generator 11, ensuring that the vacuum system 100 can work effectively and maintaining the vacuum environment of devices connected to the vacuum system 100 (such as hydraulic stations). The filtrate outlet 312 is used at least to discharge the filtrate filtered by the vacuum filter 31. Over time, the filtrate filtered from the gas by the vacuum filter 31 will accumulate in the vacuum filter 31. The filtrate outlet 312 allows the filtrate in the vacuum filter 31 to flow out to the outside of the vacuum filter 31 through the filtrate outlet 312, so that the filtrate in the vacuum filter 31 can be discharged in time, avoiding the accumulation of filtrate in the vacuum filter 31, preventing the vacuum filter 31 from being blocked due to excessive filtrate, and affecting the filtration effect of the vacuum filter 31 and the normal operation of the vacuum system 100.

[0048] Further, see Figures 1 to 5 As shown, the vacuum system 100 also includes a first control valve 50, and the pipeline assembly 20 also includes a second pipeline 23. The first control valve 50 is connected to the filtrate outlet 312 through the second pipeline 23, and the first control valve 50 includes an on state and a off state. The first control valve 50 is configured such that when the vacuum system 100 is performing vacuuming, the first control valve 50 is in the off state, and when the vacuum system 100 is not performing vacuuming and the filtrate filtered by the vacuum filter 31 needs to be discharged, the first control valve 50 is in the on state.

[0049] Specifically, this application includes a first control valve 50 in the vacuum system 100, connected to the filtrate outlet 312 of the vacuum filter 31 via a second pipe 23. The first control valve 50 has two states: an on state and a off state. When the vacuum system 100 is evacuating, the first control valve 50 is in the off state, effectively preventing air leakage from the filtrate outlet 312 and affecting the vacuuming effect of the vacuum system 100. Simultaneously, the first control valve 50 also prevents the filtrate from accidentally flowing out of the filtrate outlet 312 due to pressure changes or other factors during the vacuuming process, thus preventing interference with the vacuuming effect. When the vacuum system 100 is not evacuating and the filtrate filtered by the vacuum filter 31 needs to be discharged, the first control valve 50 is in the on state. In this case, the on state of the first control valve 50 does not affect the vacuuming effect of the vacuum system 100, allowing the vacuum filter 31 to discharge the filtrate smoothly at the appropriate time, meeting the needs of regular maintenance and cleaning of the vacuum system 100. For example, during the process of vacuuming the hydraulic station's oil tank using the vacuum system 100 to create negative pressure, a certain amount of hydraulic oil accumulates in the vacuum filter 31 after a period of filtration. If the vacuum system 100 continues to operate, it may affect its vacuuming effect. In this case, simply pausing the vacuuming process and opening the first control valve 50 allows the hydraulic oil to be easily discharged, ensuring that the vacuum filter 31 maintains its good filtration performance. The first control valve 50 allows the vacuum system 100 to flexibly respond to different working scenarios and needs. Whether it's continuous vacuuming for extended periods or periodic filtrate drainage for equipment maintenance, the vacuum system 100 operates smoothly. This flexibility enhances the adaptability of the vacuum system 100, enabling it to meet the diverse production process requirements of different industries such as food processing, pharmaceuticals, and chemicals.

[0050] Further, see Figures 1 to 5 As shown, the gas-liquid separation device 40 includes an oil mist separator 41. The oil mist separator 41 includes an air inlet 411, an exhaust port 412, and a liquid outlet 413. The air inlet 411 is connected to the air outlet 113, the exhaust port 412 is connected to the outside, and the liquid outlet 413 is used to discharge the filtrate filtered by the oil mist separator 41.

[0051] Specifically, the air inlet 411 is connected to the air outlet 113, ensuring that when the vacuum system 100 applies negative pressure to structures such as the oil tank of the hydraulic station, the gas exiting from the air outlet 113 of the multi-stage vacuum generator 11 can smoothly enter the oil mist separator 41. Through the internal filtration and separation mechanism of the oil mist separator 41, the oil mist can be separated from the gas, instead of being directly discharged into the atmosphere as before. This would affect both the external working environment of the vacuum system 100 and the safety of the operators, because if air containing oil mist is directly discharged into the atmosphere, there is a risk of explosion when the concentration of oil mist reaches a certain level, which is extremely dangerous. Therefore, after the initial filtration by the vacuum filter 31, the oil mist separator 41 installed here can perform secondary filtration on the air in the vacuum system 100, preventing flammable substances such as oil mist from being directly discharged into the atmosphere and affecting the safety of the operators. The exhaust port 412 is connected to the outside, allowing the clean gas treated by the oil mist separator 41 to be discharged into the external environment. This is crucial for improving the air quality in the working environment and reducing health hazards to operators. The drain port 413 is used to drain the filtrate filtered by the oil mist separator 41, thus providing a reasonable discharge path for the separated hydraulic oil, allowing it to be discharged in a timely manner and preventing it from accumulating in the oil mist separator 41, which would affect the separation effect of the oil mist separator 41 and the normal operation of the vacuum system 100.

[0052] Further, see Figures 1 to 5 As shown, the vacuum system 100 also includes a second control valve 60, and the piping assembly 20 also includes a third pipe 24. The second control valve 60 is connected to the drain port 413 through the third pipe 24. The second control valve 60 includes an open state and a closed state. The second control valve 60 is configured such that when the vacuum system 100 is performing vacuuming, the second control valve 60 is in the closed state, and when the vacuum system 100 is not performing vacuuming and the filtrate separated by the oil mist separator 41 needs to be discharged, the second control valve 60 is in the open state.

[0053] Specifically, the vacuum system 100 is equipped with a second control valve 60, which is connected to the drain port 413 of the oil mist separator 41 via a third pipe 24. This valve has two states: open and closed. When the vacuum system 100 is in vacuuming mode, the second control valve 60 is closed, which effectively prevents the filtrate separated from the oil mist separator 41 from being accidentally discharged due to factors such as pressure changes within the system during vacuuming. When the vacuum system 100 stops vacuuming and needs to discharge the filtrate separated from the oil mist separator 41, the second control valve 60 is in the open state. This setting allows operators to discharge the filtrate at appropriate times, meeting the needs of regular maintenance of the vacuum system 100. For example, during the vacuuming process of the vacuum system 100 evacuating the oil tank of the hydraulic station, after the oil mist separator 41 has been processing air containing hydraulic oil for a long time, a certain amount of hydraulic oil will accumulate inside. At this time, pausing the vacuuming process of the vacuum system 100 and opening the second control valve 60 can easily discharge the hydraulic oil, ensuring the continuous and efficient operation of the oil mist separator 41. This can greatly reduce the possibility of safety accidents caused by directly discharging air containing hydraulic oil mist into the air, thereby improving the stability, reliability and safety of the vacuum system 100.

[0054] Further, see Figures 1 to 5 As shown, the vacuum system 100 also includes a pressure reducing valve 70, which is connected to the air inlet 111 of the vacuum generator 10, and the pressure reducing valve 70 is used at least to control the flow rate of the compressed gas flowing into the air inlet 111.

[0055] Specifically, the vacuum system 100 is equipped with a pressure reducing valve 70, which is connected to the inlet 111 of the vacuum generator 10. This effectively controls the flow rate of compressed gas into the inlet 111, allowing for precise regulation of the amount of compressed gas entering the vacuum generator 10. For example, in experimental environments requiring extremely high vacuum stability, precise adjustment of the compressed gas flow rate ensures that the vacuum generator 10 stably generates the required vacuum level, preventing vacuum fluctuations due to unstable inlet flow and thus guaranteeing the accuracy of experimental results. Simultaneously, proper control of the compressed gas flow rate into the inlet 111 helps protect the vacuum generator 10. Excessive compressed gas flow may cause excessive pressure shocks to the internal components of the vacuum generator 10, accelerating wear and even causing damage. The pressure reducing valve 70 controls the flow rate within a suitable range, reducing such excessive pressure shocks and extending the service life of the vacuum generator 10, thereby reducing the maintenance costs of the vacuum system 100 to some extent. Different working scenarios have different requirements for vacuum level and pumping speed. By adjusting the flow rate of compressed gas flowing into the inlet 111 through the pressure reducing valve 70, the vacuum system 100 can adapt to various working conditions. The pressure reducing valve 70 can precisely control the flow rate of compressed gas according to actual needs, avoiding unnecessary energy waste. When a large amount of compressed gas is not needed to generate a vacuum, appropriately reducing the flow rate can meet the system's working requirements while reducing energy consumption. For example, in some intermittently operating vacuum equipment, by reasonably adjusting the pressure reducing valve 70, energy utilization can be optimized at different stages of equipment operation, reducing long-term operating costs for enterprises.

[0056] Further, see Figures 1 to 5 As shown, the vacuum system 100 also includes a first pressure sensor 80, which is disposed at the vacuum end 112 of the vacuum generating device 10, and the first pressure sensor 80 is used at least to detect the vacuum degree of the vacuum end 112.

[0057] Specifically, the vacuum system 100 is equipped with a first pressure sensor 80 at the vacuum end 112 of the vacuum generator 10, which can detect the vacuum level of the vacuum end 112 in real time. For example, when using the vacuum system 100 to evacuate a hydraulic station, real-time acquisition of vacuum level data is crucial. Through the first pressure sensor 80, operators can promptly understand whether the vacuum end 112 has reached and maintained the required vacuum level of the hydraulic station, thereby ensuring the performance of the entire vacuum system 100 and ensuring the smooth operation of the process. The vacuum level data detected by the first pressure sensor 80 provides key feedback for system control. Based on the data detected by the first pressure sensor 80, operators can make precise adjustments to relevant components of the system. For example, if the vacuum level in the oil tank of the hydraulic station does not reach the set value, the flow rate of compressed gas entering the inlet 111 of the vacuum generator 10 can be controlled by adjusting the pressure reducing valve 70, or the normal operation of components such as the filter device 30 and the gas-liquid separator 40 can be checked to increase the vacuum level, which helps to improve the operating efficiency and stability of the vacuum system 100. Continuous monitoring of the vacuum level of the vacuum end 112 helps to detect potential system faults in a timely manner. If the vacuum level fluctuates abnormally or deviates from the normal range, it may indicate problems such as leaks or component damage in the vacuum system 100. For example, a sudden drop in vacuum level may indicate a leak in the piping assembly 20. Using data detected by the first pressure sensor 80, operators can promptly detect these anomalies and take preventative measures, such as troubleshooting and equipment repair, thereby preventing more serious system failures, reducing the risk of production interruptions, and ensuring production continuity and product quality.

[0058] On the other hand, see Figures 1 to 5 As shown, this application also mentions a hydraulic station 900, which is at least used to supply hydraulic oil to a predetermined machine tool 200. The hydraulic station 900 includes the aforementioned vacuum system 100. At the same time, the hydraulic station 900 also includes an oil tank 91, an oil supply component 92, and a return oil pipe 93. The vacuum suction pipe 21 is connected to the oil tank 91 to at least draw negative pressure into the oil tank 91. The filter outlet 312 and the drain outlet 413 of the vacuum system 100 are both connected to the oil tank 91 to at least guide the hydraulic oil in the vacuum system 100 to the oil tank 91. The oil supply component 92 is connected between the oil tank 91 and the predetermined machine tool 200 to supply hydraulic oil to the predetermined machine tool 200. The return oil pipe 93 is provided between the oil tank 91 and the predetermined machine tool 200 to transport the hydraulic oil of the predetermined machine tool 200 to the oil tank 91.

[0059] Specifically, the machine tool 200 includes an oil return tank 210, which is connected to an oil tank 91 via an oil return pipe 93. The oil tank 91 has an oil return port 914. The vacuum system 100 in the hydraulic station 900 is connected to the oil return port 914 of the oil tank 91 via a vacuum suction pipe 21, creating a negative pressure in the oil tank 91. This allows the hydraulic oil in the oil return tank 210 to be drawn back into the oil tank 91 under vacuum. The filter outlet 312 and drain outlet 413 of the vacuum system 100 are both connected to the oil tank 91, guiding the hydraulic oil separated in the vacuum system 100 back to the oil tank 91. During the filtration and separation process, some hydraulic oil inevitably gets trapped in the vacuum system 100. This recycling design effectively avoids hydraulic oil waste and improves resource utilization. Especially for some expensive special hydraulic oils, recycling and reuse can significantly reduce production costs. The oil supply assembly 92 is connected between the oil tank 91 and the predetermined machine tool 200, responsible for supplying hydraulic oil to the predetermined machine tool 200. A stable and reliable oil supply assembly 92 can precisely control the flow and pressure of the hydraulic oil according to the working requirements of the predetermined machine tool 200, ensuring that all components of the predetermined machine tool 200 receive sufficient and stable power during processing. For example, in the predetermined machine tool 200 for large-scale machining, a stable hydraulic oil supply is crucial for ensuring the feed accuracy of the cutting tool and the stability of the cutting force, contributing to improved product quality and precision. The return oil pipe 93 is located between the oil tank 91 and the predetermined machine tool 200, returning the hydraulic oil used by the predetermined machine tool 200 to the oil tank 91, forming a complete hydraulic oil circulation system. The vacuum system 100 is integrated into the hydraulic station 900, along with the oil tank 91, oil supply assembly 92, and return oil pipe 93, forming a fully functional integrated system. This design reduces the complexity of connections between system components, improves system compactness, and reduces the risk of leakage. The components work collaboratively and cooperate with each other, improving the overall reliability of the hydraulic station 900. For example, in industrial production workshops, the compact and reliable hydraulic station 900 occupies little space, is easy to maintain, and can better adapt to complex production environments, providing stable hydraulic support for the predetermined machine tool 200. Compared with conventional vacuum devices, the vacuum system 100 of this application allows the hydraulic oil in the return oil groove 210 to flow back into the oil tank 91 by evacuating the oil tank 91, which can greatly reduce the height difference requirement between the oil tank 91 and the return oil groove 210, and at the same time optimize the structure of the bed, crossbeam, and return oil groove 210 of the predetermined machine tool 200. Moreover, the vacuum system 100 of this application can also optimize the pipeline layout of the hydraulic system composed of the vacuum system 100, the predetermined machine tool 200, and the hydraulic station 900, reducing the limitations of the pipeline layout.

[0060] Further, see Figures 1 to 5As shown, the top of the oil tank 91 is equipped with a filler port 911 that communicates with the interior of the oil tank 91. Operators can add hydraulic oil to the oil tank 91 through the filler port 911, ensuring that the hydraulic station 900 can continuously supply hydraulic oil to the machine tool 200. To ensure that the vacuum system 100 can effectively evacuate the oil tank 91, the filler port 911 is normally sealed and is only allowed to be opened when hydraulic oil needs to be added to the oil tank 91. Furthermore, the oil tank 91 is equipped with a level sensor 912 and a second shut-off valve 913. The level sensor 912 helps operators effectively determine the hydraulic oil level inside the oil tank 91, allowing operators to add hydraulic oil to the oil tank 91 through the filler port 911 when the hydraulic oil level is low. The second shut-off valve 913 is generally located near the bottom of the oil tank 91. Through the second shut-off valve 913, the operator can drain the hydraulic oil in the oil tank 91 to facilitate the replacement of the hydraulic oil inside the oil tank 91. In order to ensure that the vacuum system 100 can effectively evacuate the oil tank 91, the second shut-off valve 913 is usually in the shut-off state. The second shut-off valve 913 is only allowed to be opened when it is necessary to replenish the hydraulic oil inside the oil tank 91.

[0061] Further, see Figures 1 to 5 As shown, the oil supply assembly 92 includes an oil supply pump 921, which consists of a motor 9211, a first pump body 9212, and a second pump body 9213. To ensure the purity of the hydraulic oil entering the oil supply pump 921, a filter element 922 is also provided at the oil inlet of the oil supply pump 921. The filter element 922 can effectively filter out impurities in the hydraulic oil entering the oil supply pump 921, thereby reducing damage to the oil supply assembly 92 and the predetermined machine tool 200. The first pump body 9212 and the second pump body 9213 can be powered by different motors 9211, or they can be powered by a single motor 9211 to form a tandem pump. This embodiment shows the case where the first pump body 9212 and the second pump body 9213 are powered by a single motor 9211 to form a tandem pump. To ensure that the hydraulic oil flowing from the outlet of the first pump body 9212 and the outlet of the second pump body 9213 does not return to the oil supply pump 921, this application provides a first check valve 923 at the outlet of the first pump body 9212 and a second check valve 924 at the outlet of the second pump body 9213. Furthermore, the oil supply pump 921 is also equipped with a return pipe 9214. When the oil supply pump 921 draws too much hydraulic oil from the oil tank 91 (i.e., exceeds the predetermined amount of hydraulic oil required by the machine tool 200), a portion of the hydraulic oil can return to the oil tank 91 through the return pipe 9214.

[0062] Further, see Figures 1 to 5As shown, the oil supply assembly 92 also includes a heat exchange module 925, which consists of a first oil filter 9251, a heat exchanger 9252, and a third check valve 9253. The inlet end of the first oil filter 9251 is connected to the end of the first check valve 923 away from the first pump body 9212, and the outlet end of the first oil filter 9251 is connected to the inlet end of the heat exchanger 9252. The outlet end of the heat exchanger 9252 is connected to the oil tank 91 through the third check valve 9253. In actual operation, a portion of the hydraulic oil in the oil supply pump 921 flows into the first oil filter 9251 through the first check valve 923. After being filtered by the first oil filter 9251, this portion of hydraulic oil enters the heat exchanger 9252, where it dissipates heat. The cooled hydraulic oil is then guided to the oil tank 91 through the third check valve 9253, thus cooling the hydraulic oil in the tank and ensuring the continuous and effective operation of the hydraulic station 900. Furthermore, the return pipe 9214 and the outlet of the heat exchanger 9252 are connected to the inlet of the third check valve 9253. This prevents hydraulic oil from flowing back into the oil supply pump 921 and the heat exchanger 9252, and also saves on component costs.

[0063] Further, see Figures 1 to 5As shown, the oil supply assembly 92 also includes an oil supply module 926, which consists of a second oil filter 9261, an accumulator 9262, a first shut-off valve 9264, and a safety valve 9265. The inlet end of the second oil filter 9261 is connected to the outlet end of the oil supply pump 921, and the outlet end of the second oil filter 9261 is connected to the predetermined machine tool 200. In this way, the hydraulic oil entering the predetermined machine tool 200 can be filtered to prevent impurities from entering the predetermined machine tool 200 and damaging the oil circuit of the predetermined machine tool 200. Accumulator 9262 is connected to the outlet end of second oil filter 9261. Accumulator 9262 has the functions of storing and releasing pressure. When the pressure of hydraulic oil in oil supply module 926 is too high, accumulator 9262 can store the pressure; when the pressure of hydraulic oil in oil supply module 926 is insufficient, accumulator 9262 can release the stored pressure, thereby supplementing the hydraulic oil pressure and ensuring that the machine tool 200 can work stably. At the same time, accumulator 9262 also has the functions of buffering and shock absorption, which can maintain the pressure stability in oil supply module 926 and prevent excessive pressure fluctuations from affecting the operation of machine tool 200. Both the first shut-off valve 9264 and the safety valve 9265 are connected to the outlet end of the second oil filter 9261, which can protect the oil supply module 926 and prevent excessive hydraulic oil from damaging the oil supply module 926. At the same time, when the machine tool 200 has a problem and needs to be stopped, the operator can also use the safety valve 9265 to guide the hydraulic oil in the oil supply module 926 back to the oil tank 91, preventing the oil supply module 926 from continuously supplying oil to the machine tool 200 and causing the problem of the machine tool 200 to worsen.

[0064] Further, see Figures 1 to 5 As shown, the oil supply module 926 also includes a second pressure sensor 9263 and a temperature sensor 9266. The second pressure sensor 9263 is located in the accumulator 9262 to monitor the internal pressure of the accumulator 9262 in real time, preventing excessive internal pressure from damaging the accumulator 9262 or causing a safety accident. The temperature sensor is located at the outlet end of the second oil filter 9261 to monitor the temperature of the hydraulic oil in the oil supply module 926 in real time, preventing the hydraulic oil temperature from being too high or too low and affecting the normal operation of the predetermined machine tool 200. The placement of the second pressure sensor 9263 and the temperature sensor 9266 allows the operator to understand the pressure and temperature of the hydraulic oil in the oil supply module 926 in real time. This enables the operator to make timely adjustments to the relevant components of the hydraulic station 900 (such as the oil supply pump 921 and the heat exchanger 9252) when the pressure and temperature of the hydraulic oil are abnormal, thereby ensuring that the system consisting of the vacuum system 100, the predetermined machine tool 200, and the hydraulic station 900 can operate continuously and stably.

[0065] Further, see Figures 1 to 5 As shown, the hydraulic station 900 also includes a controller 94. The controller 94 is electrically connected to the first pressure sensor 80 and the oil supply component 92 of the vacuum system 100. When the first pressure sensor 80 detects that the vacuum degree of the vacuum end 112 of the vacuum generator 10 is less than a predetermined value, the first pressure sensor 80 sends a signal to the controller 94. The controller 94 controls the oil supply component 92 to stop supplying hydraulic oil to the predetermined machine tool 200 according to the signal from the first pressure sensor 80.

[0066] Specifically, the hydraulic station 900 is equipped with a controller 94, which is electrically connected to the first pressure sensor 80 and the oil supply component 92 of the vacuum system 100. When the first pressure sensor 80 detects that the vacuum level at the vacuum end 112 of the vacuum generator 10 is less than a predetermined value, it means that the vacuum environment has not met the requirements. At this time, if hydraulic oil continues to be supplied to the machine tool 200, the insufficient vacuum may cause excessive gas to mix into the hydraulic oil, leading to problems such as cavitation and damage to hydraulic components. The controller 94 controls the oil supply component 92 to stop supplying oil based on the signal from the first pressure sensor 80, which can effectively avoid problems such as cavitation and ensure the safe operation of the hydraulic system. By monitoring the vacuum level in real time and controlling the oil supply component 92 accordingly, the matching between the hydraulic oil supply and the vacuum environment is ensured. A stable vacuum level is crucial for maintaining the good performance of hydraulic oil. Stopping the oil supply when the vacuum level is abnormal avoids pressure fluctuations and unstable flow in the hydraulic system caused by vacuum problems. The electrical connection between the controller 94, the first pressure sensor 80, and the oil supply component 92 realizes intelligent automatic control. The system automatically responds to the actual vacuum level without requiring constant manual monitoring and operation of the oil supply component 92. This not only reduces manual intervention and the possibility of human error but also increases the automation level of the production process. In modern industrial production workshops, this intelligent control method meets the needs of efficient and precise production, significantly improving production efficiency. Stopping the supply of hydraulic oil to the designated machine tool 200 when the vacuum level is insufficient effectively protects it. Inappropriate vacuum levels can degrade the quality of the hydraulic oil entering the machine tool, affecting the lubrication and transmission of various machine tool components. Long-term use may lead to accelerated wear and reduced precision. By promptly stopping the oil supply, damage to the designated machine tool 200 caused by hydraulic oil problems can be avoided, extending the machine tool's service life and reducing maintenance costs. This vacuum-feedback-based oil supply control mechanism optimizes the overall performance of the hydraulic station 900. It tightly integrates the vacuum system 100 with the oil supply process, improving the coordination between different parts of the system. By rationally controlling the vacuum level and oil supply, the reliability and stability of the entire hydraulic system are improved, meeting the performance requirements of the hydraulic station 900 under different working conditions, enhancing the system's adaptability and practicality, and enabling it to better serve the intended working needs of the machine tool 200.

[0067] Optionally, the controller 94 is electrically connected to both the first control valve 50 and the second control valve 60 of the vacuum system 100:

[0068] When the vacuum system 100 is evacuating the oil tank 91, the controller 94 controls the first control valve 50 to be in the off state and the controller 94 controls the second control valve 60 to be in the closed state; when the vacuum system 100 is not evacuating the oil tank 91 and it is necessary to discharge the hydraulic oil filtered by the vacuum system 100, the controller 94 controls the first control valve 50 to be in the on state and the controller 94 controls the second control valve 60 to be in the open state.

[0069] Specifically, both the first control valve 50 and the second control valve 60 can be solenoid valves. The controller 94 is electrically connected to both the first control valve 50 and the second control valve 60 of the vacuum system 100. When the vacuum system 100 evacuates the oil tank 91, the controller 94 controls the first control valve 50 to be in the off state and the second control valve 60 to be in the closed state. This precise control can effectively prevent the hydraulic oil from the filter outlet 312 and the drain port 413 from accidentally flowing out during the vacuuming process. It can also prevent the filter outlet 312 and the drain port 413 from being vented by air, thus affecting the working effect of the vacuum system 100. When the vacuum system 100 is not evacuating the oil tank 91 and it is necessary to discharge the hydraulic oil filtered by the vacuum system 100, the controller 94 controls the first control valve 50 to be in the on state and the second control valve 60 to be in the open state. At this time, the filter fluid filtered by the vacuum filter 31 and the hydraulic oil separated by the oil mist separator 41 can be discharged back to the oil tank 91 in an orderly manner. This facilitates maintenance and management of the entire hydraulic system by operators, such as periodically cleaning the hydraulic oil accumulated in the filter device 30 and the gas-liquid separator 40, ensuring that these devices maintain good working performance and thus guaranteeing the overall operating efficiency of the vacuum system 100. The automatic control of the first control valve 50 and the second control valve 60 by the controller 94 greatly enhances the automation level of the vacuum system 100. Manual operation of the valves (i.e., the first control valve 50 and the second control valve 60) is eliminated, reducing the risk of valve errors due to human negligence or misoperation. In industrial production environments, operators may make operational errors due to high workload or lack of concentration; automated control effectively avoids such problems, ensuring the system operates safely and stably according to the preset process. The flexible control of the first control valve 50 and the second control valve 60 by the controller 94 allows the vacuum system 100 to better adapt to different working scenarios and needs. Whether it's a long-term continuous vacuuming operation or a system maintenance requiring periodic filtration of hydraulic oil, the hydraulic power unit 900 can quickly and accurately switch to the corresponding working mode through the control of the controller 94, thus enabling the hydraulic power unit 900 to meet the work requirements.

[0070] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0071] (1) It greatly reduces the noise generated by the vacuum generator, and can be reduced to almost inaudible to the human ear during actual operation;

[0072] (2) It greatly reduces the air consumption of the vacuum generator and reduces energy consumption. Through calculation and comparison, it can be seen that it can reduce energy consumption by at least 45%, and in actual use it can reduce energy consumption by nearly 60%.

[0073] (3) The vacuum system filters the air in the oil tank through a filter device and a gas-liquid separator, which can filter more than 99% of the hydraulic oil in the air, prevent hydraulic oil mist from polluting the atmosphere, and reduce hydraulic oil loss.

[0074] (4) The structure and layout of the hydraulic system consisting of the vacuum system, the predetermined machine tool and the hydraulic station can be optimized, such as reducing the bed and crossbeam of the predetermined machine tool and optimizing the design requirements of the hydraulic station and pipeline layout.

[0075] (5) The vacuum system has high versatility and can meet the needs of various types of machine tools and hydraulic stations;

[0076] (6) The vacuum system is connected to the controller of the predetermined machine tool, which can monitor the operating status of the vacuum system in real time and avoid the problem of hydraulic oil overflowing from the return oil tank due to the inability to return oil.

[0077] (7) The hydraulic oil filtered by the vacuum system can be recycled to the oil tank for reuse, which can reduce costs to a certain extent.

[0078] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0079] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0080] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A vacuum pumping system, characterized in that, include: A vacuum generating device (10) includes an inlet end (111), a vacuum end (112) and an outlet end (113), wherein the inlet end (111) is used to introduce compressed gas; Piping assembly (20), the piping assembly (20) includes a vacuum suction tube (21); A filter device (30), one end of which is connected to the vacuum suction tube (21), and the other end of which is connected to the vacuum end (112); A gas-liquid separation device (40) is connected to the gas outlet (113); The vacuum system (100) further includes a first control valve (50), and the pipeline assembly (20) further includes a second pipeline (23). The first control valve (50) is connected to the filtrate outlet (312) through the second pipeline (23), and the first control valve (50) includes an on state and an off state. The first control valve (50) is configured such that when the vacuum system (100) is performing vacuuming, the first control valve (50) is in the off state, and when the vacuum system (100) is not performing vacuuming and the filtrate filtered by the vacuum filter (31) needs to be discharged, the first control valve (50) is in the on state. The vacuum system (100) further includes a second control valve (60), and the pipeline assembly (20) further includes a third pipeline (24). The second control valve (60) is connected to the drain port (413) through the third pipeline (24). The second control valve (60) includes an open state and a closed state. The second control valve (60) is configured such that when the vacuum system (100) is performing vacuuming, the second control valve (60) is in the closed state, and when the vacuum system (100) is not performing vacuuming and the filtrate separated by the oil mist separator (41) needs to be discharged, the second control valve (60) is in the open state.

2. The evacuation system of claim 1, wherein, The vacuum generating device (10) includes a multi-stage vacuum generator (11).

3. The evacuation system of claim 1, wherein, The filtration device (30) includes a vacuum filter (31), which includes an air inlet (311), a filtrate outlet (312), and an air outlet (313). The pipeline assembly (20) also includes a first pipeline (22). The air inlet (311) is connected to the vacuum suction pipe (21), the air outlet (313) is connected to the vacuum end (112) through the first pipe (22), and the filtrate outlet (312) is used at least to discharge the filtrate filtered by the vacuum filter (31).

4. The evacuation system of claim 1, wherein, The gas-liquid separation device (40) includes an oil mist separator (41), which includes an air inlet (411), an exhaust port (412), and a liquid outlet (413). The air inlet (411) is connected to the air outlet (113), the exhaust port (412) is connected to the outside, and the liquid outlet (413) is used to discharge the filtrate filtered by the oil mist separator (41).

5. The evacuation system according to any one of claims 1 to 4, characterized in that The vacuum system (100) also includes a pressure reducing valve (70), which is connected to the air inlet (111) of the vacuum generator (10), and the pressure reducing valve (70) is used at least to control the flow rate of the compressed gas flowing into the air inlet (111).

6. The evacuation system of claim 5, wherein, The vacuum system (100) further includes a first pressure sensor (80), which is disposed at the vacuum end (112) of the vacuum generating device (10) and is used at least to detect the vacuum degree of the vacuum end (112).

7. A hydraulic station, which hydraulic station (900) is at least used for supplying a predetermined machine tool (200) with hydraulic oil, characterized in that, The hydraulic station (900) includes a vacuum system (100) according to any one of claims 1 to 6. The hydraulic station (900) includes an oil tank (91), an oil supply component (92), and a return oil pipe (93). The vacuum suction pipe (21) is connected to the oil tank (91) to at least draw negative pressure into the oil tank (91). The filtrate outlet (312) and the drain outlet (413) of the vacuum system (100) are both connected to the oil tank (91) to at least guide the hydraulic oil in the vacuum system (100) to the oil tank (91). The oil supply component (92) is connected between the oil tank (91) and the predetermined machine tool (200) to supply hydraulic oil to the predetermined machine tool (200). The return oil pipe (93) is disposed between the oil tank (91) and the predetermined machine tool (200) to supply the hydraulic oil of the predetermined machine tool (200) to the oil tank (91).

8. The hydraulic station according to claim 7, characterized in that The hydraulic station (900) also includes a controller (94); The controller (94) is electrically connected to both the first pressure sensor (80) of the vacuum system (100) and the oil supply assembly (92). When the first pressure sensor (80) detects that the vacuum level at the vacuum end (112) of the vacuum generator (10) is less than a predetermined value, the first pressure sensor (80) sends a signal to the controller (94). The controller (94) then controls the oil supply assembly (92) to stop supplying hydraulic oil to the predetermined machine tool (200) based on the signal from the first pressure sensor (80); and / or, The controller (94) is electrically connected to the first control valve (50) and the second control valve (60) of the vacuum system (100): when the vacuum system (100) is evacuating the oil tank (91), the controller (94) controls the first control valve (50) to be in the off state and the controller (94) controls the second control valve (60) to be in the closed state; when the vacuum system (100) is not evacuating the oil tank (91) and it is necessary to discharge the hydraulic oil filtered by the vacuum system (100), the controller (94) controls the first control valve (50) to be in the on state and the controller (94) controls the second control valve (60) to be in the open state.

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