Energy-saving piston vacuum pump

Abstract

The application discloses an energy-saving piston vacuum pump, which comprises a pump body and a barrel body provided with two barrel covers, the pump body is provided with an air inlet and an air outlet, the barrel cover is communicated with an exhaust pipe provided with a gas-liquid separation structure, two cylinders and a partition plate located between the outer sides of the cylinders are connected to the upper end of the barrel body, the upper end of the partition plate is provided with a flow splitter on both sides, a flow distribution channel is formed between the flow splitter and the outer side of the cylinder, the upper end of the barrel body is provided with an air inlet pipe communicated with the two flow distribution channels and the air outlet pipe, an oil filter plate is arranged between the air inlet pipe and the flow splitter, a plurality of installation holes provided with first oil separation cores are uniformly arranged at the bottom of the cylinder, a pressing plate provided with a vent is arranged between the top end of the cylinder and the bottom of the barrel cover, the pressing plate is provided with a water collecting box located directly below the exhaust pipe and a water filter ring located between the top end of the water collecting box and the outer side of the exhaust pipe, and a drain pipe is communicated between the bottom of the water collecting box and one side of the barrel body; the whole has the advantages of good filtering effect, compact structure, convenient replacement of filter cores and energy saving and environmental protection.

Description

Technical Field

[0001] This invention belongs to the field of vacuum pump technology, and more specifically, it relates to an energy-saving piston vacuum pump. Background Technology

[0002] A vacuum pump is a device or equipment that uses mechanical, physical, chemical, or physicochemical methods to evacuate a container and create a vacuum. In simpler terms, a vacuum pump is a device that improves, generates, and maintains a vacuum in a closed space using various methods. A piston-type diaphragm vacuum pump is one type of vacuum pump. Existing piston-type vacuum pumps generally discharge air containing oil mist. To avoid direct discharge of oil-mist-laden air into the environment and causing air pollution, piston-type vacuum pumps are typically equipped with an oil mist separation structure. Under the action of the driving force, the oil-gas mixture on one side passes through the filter paper and cotton of the vacuum pump's oil-gas separator, while the oil is trapped, thus achieving the separation of gas and oil. The discharged gas is oil-free, achieving a pollution-free and clean effect.

[0003] Existing piston vacuum pumps typically use a single, large-volume filter element in a single-bucket configuration for oil-gas separation. Different gas volumes require different filter elements, and since piston vacuum pump units come in many specifications, a wide variety of filter element sizes and specifications are needed, leading to incomplete oil-gas separation and low efficiency. To ensure oil-gas separation efficiency, the bulk of the pump casing is usually increased, resulting in a large overall footprint and inconvenient filter element replacement. Furthermore, existing piston vacuum pumps produce high-temperature, high-humidity gases. After oil filtration, the high temperature of the filtered gas during exhaust creates a significant temperature difference with the ambient environment. Water vapor in the gas near the exhaust port or discharged through the exhaust pipe is easily liquefied to form condensate. This condensate not only falls to the ground and forms puddles or freezes when it gets cold, posing a safety hazard, but also, when the piston vacuum pump stops, the condensate in the exhaust pipe can flow back into the oil-gas separator, preventing the lubricant after separation from being recycled. This affects the oil-gas separation effect and environmental protection and energy saving, and causes the vacuum pump to malfunction. In addition, the existing filter element is only fixed at the bottom and has no limit at the top, making it very easy for the filter element to loosen due to the vibration of the whole machine, affecting the oil filtration effect. Overall, it has the problems of poor oil-gas separation effect, large space occupation, and difficulty in replacing the filter element. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide an energy-saving piston vacuum pump that uses a dual-cylinder design to simultaneously perform oil filtration and water collection functions within the same cylinder. This improves the stability of the filter element installation, ensures thorough separation of gas and oil, guarantees energy conservation and environmental protection, and maintains overall filtration effectiveness. Furthermore, the pump features a compact overall structure, significantly saves space, and facilitates filter element replacement. It boasts advantages such as excellent separation performance, compact structure, and easy filter element replacement.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An energy-saving piston vacuum pump includes a pump body with an inlet and an outlet, a barrel, and two lids connected to the barrel lids via exhaust pipes. The upper end of the barrel body is connected to two cylindrical bodies and a partition plate located between the outer sides of the cylindrical bodies. Diverter plates are installed on both sides of the upper end of the partition plate, forming diverter channels between the diverter plates and the outer sides of the cylindrical bodies. An inlet pipe communicating with the two diverter channels is located at the upper end of the barrel body, and an oil filter plate is installed between the inlet pipe and the diverter plates. The air outlet pipe is connected to the air inlet pipe; several mounting holes are evenly opened at the bottom of the cylinder, and the first oil separator core is detachably installed in the mounting holes; a pressure plate for pressing down the top of the first oil separator core is pressed between the top of the cylinder and the bottom of the barrel cover; the pressure plate is provided with an air vent; a gas-liquid separation structure is provided inside the exhaust pipe; a water collection box located directly below the exhaust pipe and a water filter ring located between the top outer side of the water collection box and the exhaust pipe are installed on the pressure plate; a drain pipe is connected between the bottom of the water collection box and one side of the barrel.

[0007] Further configuration: The bottom of the first oil separator core is threadedly connected to the mounting hole; a retaining ring is provided radially outward at the lower outer side of the first oil separator core, abutting against the bottom of the inner cylinder; a first sealing ring is provided between the bottom of the retaining ring and the bottom of the inner cylinder; the bottom of the pressure plate is provided with several limiting rings for placing the top of the first oil separator core; several arc-shaped limiting plates are provided inside the limiting rings; several limiting grooves are evenly opened on the inner side of the limiting rings; the limiting plates are located between the limiting rings and the first oil separator core; a shock-absorbing spring is connected between the bottom of the limiting groove and the limiting plate.

[0008] Further configuration: The pressure plate includes an upper plate and a lower plate. A set of screws is evenly arranged at the upper end of the lower plate. The screws are threaded with nuts, and their top ends abut against the bottom end face of the bucket lid. The upper plate has a through hole for the screws to pass through. Both the upper and lower plates are provided with vents. The water collection box is installed on the upper plate. The limiting ring is installed at the bottom of the lower plate. The lower plate has a clearance hole for the water collection box to pass through. The edge of the upper plate extends upward and is provided with an inverted L-shaped mounting part. The horizontal end of the mounting part presses between the bottom end of the bucket lid and the top end of the cylinder.

[0009] Further configuration: The oil filter plate is a perforated arc-shaped plate. The side of the arc-shaped plate near the air intake pipe has several convex strips arranged in a wavy cross-section. The partition plate has an oil outlet hole located below the air intake pipe. The oil outlet hole is located outside the diversion channel. The partition plate has an oil guide groove that is inclined downward toward the oil outlet hole. One side of the oil guide groove is located below the arc-shaped plate, and the other side communicates with the oil outlet hole.

[0010] Further configuration: An oil-gas separator is detachably installed below the cylinder. The oil-gas separator includes a connecting plate, several second oil separator cores, several guide rods, and several spiral blades that are retractable along the length of the guide rods. The connecting plate has several through slots, and a connecting ring is rotatably connected to each through slot. A guide sleeve that slides on the guide rod is connected to the inner side of each spiral blade. The connecting ring is connected to the bottom end of the guide rod. The bottom of each second oil separator core is threaded to the inner side of the connecting ring. A pressure ring for pressing the top of the second oil separator core is connected to the top of the guide rod. The top of the spiral blade is fixedly connected to the bottom end of the pressure ring. A ring-shaped connecting part extends from the bottom of the cylinder, and the inner side of the connecting part is detachably connected to the outer side of the connecting plate. An annular baffle is installed on the connecting ring and fits around the spiral blades. An oil drain hole is provided at the bottom of the annular baffle. The outer surface of the spiral blade slides down and up to the inner side of the annular baffle.

[0011] Further configuration: The second oil separator core and the spiral blade are arranged in an alternating manner with the first oil separator core. The connecting plate is provided with an interconnected oil return groove and several annular grooves. The outer side of the barrel is provided with an oil return port connected to the pump body pipeline. The oil return port is connected to the bottom of the oil return groove by an oil return pipe. The outer side of the upper end of the connecting ring is provided with an oil guide part that is inclined downward toward the outside of the connecting ring. The annular groove is located directly below the oil guide part.

[0012] Further configuration: An oil-gas separator is detachably installed below the cylinder. The oil-gas separator includes a connecting plate, several steel wire rods, and several retractable spiral blades. The connecting plate has several through slots, and a connecting ring is rotatably connected to each through slot. A guide sleeve is connected to the inner side of each spiral blade. An installation ring for placing the steel wire rods is detachably connected to the inner side of the connecting ring. A support net is detachably connected to both the top and bottom of the installation ring. The top of the spiral blade is fixedly connected to the installation ring. A set of guide rods for the guide sleeve to slide up and down is connected to the outer side of the installation ring. An annular connecting part extends from the bottom of the cylinder, and the inner side of the connecting part is detachably connected to the outer side of the connecting plate. An annular baffle is installed on the connecting ring, which is fitted over the spiral blades. An oil drain hole is provided at the bottom of the annular baffle. The outer surface of the spiral blade slides up and down and is connected to the inner side of the annular baffle.

[0013] Further configuration: The connecting plate has several large holes, and the connecting plate has interconnected oil return grooves and several annular grooves. The outer side of the barrel has an oil return port connected to the pump body pipeline. The oil return port is connected to the bottom of the oil return groove by an oil return pipe. The outer side of the upper end of the connecting ring is provided with an oil guide part. The oil guide part is inclined downward towards the outside of the connecting ring. The annular groove is located directly below the oil guide part.

[0014] Further configuration: The filter ring includes an annular plate and a cooling pipe. The annular plate has several air holes on its side. The cooling pipe is spirally arranged around the outer side of the annular plate. Both ends of the cooling pipe pass through the outside of the barrel and are connected to a cooling water tank and a circulating water pump. The drain pipe is connected to the cooling water tank. A second sealing ring is provided between the bottom of the barrel lid and the top of the annular plate.

[0015] Further configuration: The gas-liquid separation structure includes a breathable plate and a waterproof and breathable membrane for preventing liquid from being discharged outward. The waterproof and breathable membrane is detachably connected to the upper end face of the breathable plate, and the breathable plate is detachably installed inside the exhaust pipe.

[0016] In summary, this invention, by employing a design that combines two cylinders into a single cylinder, multiple separate oil separator elements, and multiple oil-gas and gas-liquid separation processes, improves the stability of the filter element installation, fully utilizes the internal space of the cylinder, and features a reasonable and compact structure. It allows the oil-gas mixture to enter the two cylinders simultaneously for oil filtration and the filtered oil to be recycled back to the pump for reuse, thus improving filtration efficiency. The use of multiple detachable separate small oil separator elements makes replacement easier and more convenient compared to replacing a single, larger filter element of different specifications. The multiple independent small oil separator elements also make replacement more convenient. It is convenient and more versatile, suitable for use with vacuum pumps of different gas volume specifications, saving the production and maintenance costs of oil separator elements. At the same time, through multiple oil-gas separation and gas-liquid separation, it ensures that air, oil and condensate are fully separated, preventing condensate from flowing back to the bottom of the tank and affecting the recycling of the separated oil. This further improves the separation effect, separation efficiency and ensures energy saving and environmental protection. Under the same separation effect, this design greatly saves the space occupied by the tank. Overall, it has the advantages of good separation effect, compact structure, easy replacement of filter elements and energy saving and environmental protection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0018] Figure 2 This is a partial top sectional view of an embodiment of the present invention with two types of oil filter plates;

[0019] Figure 3 This is a partial sectional view of Embodiment 1 of the present invention;

[0020] Figure 4 for Figure 3 A magnified view of part A;

[0021] Figure 5 for Figure 3 A magnified view of part B;

[0022] Figure 6This is a schematic diagram of the pressure plate structure in Embodiment 1 of the present invention;

[0023] Figure 7 This is a schematic diagram of the partition structure in Embodiment 1 of the present invention;

[0024] Figure 8 A schematic diagram of the rear structure of the barrel in Embodiment 1 of the present invention;

[0025] Figure 9 This is a partial cross-sectional view of Embodiment 2 of the present invention;

[0026] Figure 10 This is a schematic diagram of the pressure plate structure in Embodiment 2 of the present invention;

[0027] Figure 11 This is a schematic diagram of the oil-gas separator in Embodiment 3 of the present invention;

[0028] Figure 12 This is a partial structural schematic diagram of Embodiment 4 of the present invention;

[0029] Figure 13 This is a partial cross-sectional view of the filter plate in Embodiment 4 of the present invention;

[0030] Figure 14 This is a schematic diagram of the structure of Embodiment 5 of the present invention;

[0031] Figure 15 This is a partial cross-sectional view of Embodiment Six of the present invention.

[0032] In the diagram: 1. Barrel body; 2. Pump body; 3. Exhaust pipe; 4. Cylinder body; 5. Baffle plate; 6. Diverter plate; 7. Diverter channel; 8. Inlet pipe; 9. Mounting hole; 10. First oil separator core; 11. Pressure plate; 12. Vent; 13. Water collection box; 14. Drain pipe; 15. Retaining ring; 16. First sealing ring; 17. Limiting ring; 18. Limiting plate; 19. Limiting groove; 20. Shock-absorbing spring; 21. Upper plate; 22. Lower plate; 23. Screw; 24. Through hole; 25. Nut; 26. Mounting part; 27. Arc plate; 28. Protruding part; 29. ​​Oil outlet; 30. Oil guide groove; 31. Connecting plate; 32. Second oil separator. 33. Core splitter; 34. Spiral blade; 35. Through groove; 36. Connecting ring; 37. Guide sleeve; 38. Guide rod; 39. Pressure ring; 40. Connecting part; 41. Oil return groove; 42. Oil return port; 43. Steel wire column; 44. Mounting ring; 45. Support mesh; 46. Annular plate; 47. Breathable and waterproof layer; 48. Groove; 49. Second sealing ring; 50. Breathable plate; 51. Waterproof and breathable membrane; 52. Annular groove; 53. Oil guide part; 54. Cooling water tank; 55. Cooling pipe; 56. Annular baffle; 57. Oil drain hole; 58. Circulating water pump; 59. Metal mesh; 60. Air inlet; 61. Air outlet. Detailed Implementation

[0033] To explain the technical content, objectives, and effects of this invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings. It should be noted that the terms "above" and "below" used in the following description refer to the attached drawings. Figure 13 The direction in the middle, the words "bottom" and "top" refer to the attached Figure 1 and Figure 3 The direction towards the geometric center of a specific component.

[0034] Please refer to Figures 1 to 8 As shown, the first embodiment provided by the present invention is as follows:

[0035] An energy-saving piston vacuum pump includes a pump body 2, which has an inlet 60 and an outlet 61. It also includes a barrel 1 with two lids connected to it, and an exhaust pipe 3. The upper part of the barrel 1 is connected to two cylinders 4 and a partition 5 located between the outer sides of the cylinders 4. Diverter plates 6 are installed on both sides of the upper end of the partition 5, forming a diversion channel 7 between the diverter plates 6 and the outer sides of the cylinders 4. An inlet pipe 8 communicating with the two diversion channels 7 is located at the upper end of the barrel 1. An oil filter is installed between the inlet pipe 8 and the diverter plates 6. The bottom of the cylinder 4 is evenly provided with several mounting holes 9, and the first oil separator core 10 is detachably installed in the mounting holes 9. A pressure plate 11 for pressing down the top of the first oil separator core 10 is pressed between the top of the cylinder 4 and the bottom of the barrel cover. The pressure plate 11 is provided with a vent 12. The exhaust pipe 3 is provided with a gas-liquid separation structure. The pressure plate 11 is provided with a water collection box 13 located directly below the exhaust pipe 3 and a water filter ring located between the top outer side of the water collection box 13 and the exhaust pipe 3. A drain pipe 14 is connected between the bottom of the water collection box 13 and one side of the barrel 1.

[0036] As described above, the oil-containing gas mixture in pump body 2 is drawn into the inlet pipe 8 through outlet 61. After entering the inner cavity of barrel 1 through inlet pipe 8, the oil-gas mixture ejected from inlet pipe 8 first impacts the oil filter plate. Some of the larger oil droplets in the oil-gas mixture are separated by the impact and fall onto baffle 5, and then fall to the bottom of barrel 1 through baffle 5, which serves as a preliminary oil filtration function for the oil-gas mixture. Then, the oil-gas mixture impacts the outer wall of barrel 4 at a certain speed and angle, and the larger oil droplets are separated after the collision. The oil droplets fall to the bottom of the barrel 1, serving as a secondary filter for the oil-gas mixture. Then, through the diversion plate 6 and the diversion channel 7, the oil-gas mixture after secondary filtration is diverted by the diversion plate 6 and guided by the two diversion channels 7, and enters from the oil-gas separator at the bottom of the barrel 4, and is evenly distributed into the two barrels 4. The filtered mixture continues to rise and enters the first oil separator core 10 for a second filtration. The separated oil droplets gather and condense into larger oil droplets in the first oil separator core 10, and fall to the bottom of the barrel 1 under the action of gravity.

[0037] After multiple oil-gas separations, the lighter gas enters the water filter ring through the vent 12 for initial gas-liquid separation. Then, the gas enters the exhaust pipe 3, where a secondary gas-liquid separation is performed through the gas-liquid separation structure. This prevents liquid from being discharged outside the tank 1 along with the gas through the exhaust pipe 3, avoiding the safety hazard caused by condensate falling to the ground. Simultaneously, the liquid after the two separations falls into the water collection box 13 under gravity for storage. When the liquid in the water collection box 13 reaches a certain level, it is discharged through the drain pipe 14. This drainage method can also be achieved through… The system is equipped with a solenoid valve and timer to discharge water periodically or manually open the valve to drain water. It is not limited to the above discharge methods. The water collection box 13 and the drain pipe 14 prevent the oil after separation from being recycled due to the backflow of condensate into the barrel 1, which would affect the oil-gas separation effect and the environmental protection and energy saving. In addition, the pressure plate 11 presses the first oil separator core 10 tightly against the bottom of the barrel 4, ensuring that the bottom of the first oil separator core 10 is closely attached to the bottom of the barrel 4. This prevents gaps from appearing between the first oil separator core 10 and the bottom of the barrel 4 due to vibration, which would affect the oil-gas separation effect.

[0038] Furthermore, the bottom of the first oil separator core 10 is threadedly connected to the mounting hole 9; a retaining ring 15 is provided on the outer side of the lower end of the first oil separator core 10, which extends radially outward and abuts against the bottom of the inner cylinder 4; a first sealing ring 16 is provided between the bottom of the retaining ring 15 and the bottom of the inner cylinder 4; the bottom of the pressure plate 11 is provided with several limiting rings 17 for the top of the first oil separator core 10 to be placed; several limiting plates 18 are provided inside the limiting rings 17 in an arc shape; several limiting grooves 19 are evenly opened on the inner side of the limiting rings 17; the limiting plates 18 are located between the limiting rings 17 and the first oil separator core 10; and a shock-absorbing spring 20 is connected between the bottom of the limiting groove 19 and the limiting plate 18.

[0039] As can be seen from the above description, by setting the bottom of the first oil separator core 10 to be threadedly connected to the mounting hole 9, it is easy to disassemble and replace the first oil separator core 10. Under the downward pressure of the pressure plate 11, the bottom end face of the retaining ring 15 is in close contact with the bottom end face inside the cylinder 4. Through the first sealing ring 16, the sealing between the bottom of the first oil separator core 10 and the bottom of the cylinder 4 is guaranteed, preventing the mixed gas at the bottom of the cylinder 4 from entering the cylinder 4 from the gap between the bottom of the first oil separator core 10 and the outer side of the bottom of the cylinder 4, thus ensuring the overall gas-liquid separation effect. Through the limiting ring 17, the limiting plate 18 and the shock-absorbing spring 20, when the whole operation generates vibration, the top of the first oil separator core 10 is limited, while the limiting plate 18 and the shock-absorbing spring 20 reduce the impact of the vibration of the first oil separator core 10 on the vibration of the whole device, further ensuring the tight contact between the first oil separator core 10 and the bottom of the cylinder 4, and ensuring the gas-liquid mixing effect.

[0040] Furthermore, the oil filter plate is a perforated arc-shaped plate 27. The side of the arc-shaped plate 27 near the intake pipe 8 has several convex strips 28 arranged in a wavy cross-section. The partition plate 5 has an oil outlet 29 located below the intake pipe 8, outside the diversion channel 7. The partition plate 5 has an oil guide groove 30 inclined downwards towards the oil outlet 29; one side of the oil guide groove 30 is located below the arc-shaped plate 27, and the other side communicates with the oil outlet 29. Another embodiment of the oil filter plate is as follows... Figure 2 The non-perforated arc plate 27 shown in (b) is shown.

[0041] As described above, the oil-gas mixture ejected from the intake pipe 8 impacts the arc-shaped plate 27. Several protruding sections 28 separate some of the larger oil droplets in the oil-gas mixture. The mixture after preliminary oil filtration enters the diversion channel 7 through the holes of the arc-shaped plate 27. The filtered oil droplets fall onto the partition plate 5 and flow through the oil guide groove 30 to the oil outlet 29. They fall to the bottom of the barrel 1 through the oil outlet 29, thus performing preliminary oil-gas separation. The oil outlet 29 is positioned outside the diversion channel 7 to prevent oil droplets from falling into contact with the diversion channel 7 or the mixture below the diversion channel 7.

[0042] Furthermore, an oil-gas separator is detachably installed below the cylinder 4. The oil-gas separator includes a connecting plate 31, several second oil separator cores 32, several guide rods 37, and several spiral blades 33 that are retractable along the length of the guide rods 37. The connecting plate 31 has several through slots 34, and connecting rings 35 are rotatably connected to the through slots 34. Guide sleeves 36 that slide on the guide rods 37 are connected to the inner side of the spiral blades 33. The connecting rings 35 are connected to the bottom end of the guide rods 37. The bottom of the second oil separator cores 32 is threadedly connected to the inner side of the connecting rings 35. The top of 37 is connected to a pressure ring 38 for pressing the top of the second oil separator core 32. The top of the spiral blade 33 is fixedly connected to the bottom of the pressure ring 38. The bottom of the cylinder 4 extends with a ring-shaped connecting part 39. The inner side of the connecting part 39 is detachably connected to the outer side of the connecting plate 31. In order to ensure that the airflow drives the spiral blade 33 to extend and retract, an annular baffle 56 is installed on the connecting ring 35 and sleeved on the spiral blade 33. The bottom of the annular baffle 56 is provided with an oil drain hole 57. The outer side of the spiral blade 33 slides down and connects to the inner side of the annular baffle 56.

[0043] Furthermore, the second oil separator core 32 and the spiral blade 33 are arranged in an alternating pattern with the first oil separator core 10. The connecting plate 31 is provided with an interconnected oil return groove 40 and several annular grooves 52. The outer side of the barrel 1 is provided with an oil return port 41 that is connected to the pump body 2. The oil return port 41 is connected to the bottom of the oil return groove 40 by an oil return pipe 42. The outer side of the upper end of the connecting ring 35 is provided with an oil guide part 53 that is inclined downward towards the outside of the connecting ring 35. The annular groove 52 is located directly below the oil guide part 53. In this embodiment, in order to ensure that the spiral blade 33 is retractable, the spiral blade 33 is made of a thin and flexible material (such as metal steel). It is not limited to this material. Other structures or material compositions, such as multi-segment composition or one flexible half and one rigid half, are acceptable as long as they can enable the spiral blade 33 to retract under compressed air impact.

[0044] As described above, when the oil-gas mixture compressed gas, after being diverted through the diversion channel 7, enters the oil-gas separator for three stages of oil-gas separation, the mixed gas first enters the second oil separator core 32. After being filtered by the second oil separator core 32, larger oil droplets are blocked within the second oil separator core 32. The filtered oil droplets gather and condense into larger oil droplets within the second oil separator core 32, and fall to the bottom of the tank 1 under gravity. The gas after preliminary oil filtration passes through the side of the second oil separator core 32 and is blocked and impacted by the spiral blades 33, undergoing a second oil-gas separation. The filtered oil droplets accumulate on the surface of the spiral blades 33, forming larger oil droplets. The accumulated large oil droplets first fall onto the connecting plate 31, then are guided by the oil guide section 53 to the annular groove 52, then flow through the annular groove 52 to the return oil groove 40, and finally through the return oil pipe 42, the filtered and collected oil droplets are sucked back into the pump body 2. The filtered gas is discharged from the gap between the top of the annular baffle 56 and the pressure ring 38, further ensuring energy conservation and environmental protection. Through the guide sleeve 36 and the guide rod 37, the spiral blade 33 is set to be retractable along the length of the guide rod 37. Under the push of the airflow, it continuously expands and contracts, aggravating the instability of the mixed gas flow and ensuring the gas-liquid separation effect. In addition, the oil droplets filtered by the first oil separator 10 will also fall onto the connecting plate 31 and then be recovered through the return oil tank 40 and the return oil pipe 42. The second oil separator 32 and the spiral blade 33 are both arranged in a staggered manner with the first oil separator 10 to avoid the oil droplets filtered by the first oil separator 10 falling onto the second oil separator 32 and the spiral blade 33, thereby affecting the separation effect and efficiency. In addition, when it is necessary to replace and clean the oil-gas separator, the cylinder 4 can be removed and the connecting plate 31 can be disassembled from the connecting part 39 at the bottom of the cylinder 4.

[0045] Furthermore, the filter ring includes an annular plate 46 and a cooling pipe 55. Several air holes are opened on the side of the annular plate 46. The cooling pipe 55 is spirally arranged around the outside of the annular plate 46. Both ends of the cooling pipe 55 pass through the outside of the barrel 1 and are connected to the cooling water tank 54 and the circulating water pump 58. The drain pipe 14 is connected to the cooling water tank 54. A second sealing ring 49 is provided between the bottom of the barrel cover and the top of the annular plate 46.

[0046] As described above, when the gas after oil filtration by the first oil separator 10 rises to near the exhaust pipe 3, the water vapor in the gas first condenses into condensate through heat exchange in the cooling pipe 55. Then, the pores of the annular plate 46 perform preliminary filtration of the condensate originally carried in the gas and the condensate formed thereafter, achieving initial gas-liquid separation. The filtered liquid gathers in the water filter ring and flows into the water collection box 13 through the gap between the side of the bottom of the annular plate 46 and the inner wall of the water collection box 13, reducing the amount of condensate formed in the exhaust pipe 3. The water in the water collection box 13 enters the cooling water tank 54 outside the barrel 1 through the drain pipe 14 for cooling. The circulating water pump 58 circulates and draws the water in the cooling water tank 54 into the cooling pipe 55, which can be used as cooling water to enter the cooling pipe 55, further ensuring the energy-saving and environmental protection effect.

[0047] Furthermore, the gas-liquid separation structure includes a breathable plate 50 and a waterproof and breathable membrane 51 for preventing liquid from being discharged outward. The waterproof and breathable membrane 51 is detachably connected to the upper end face of the breathable plate 50, and the breathable plate 50 is detachably installed inside the exhaust pipe 3. In this embodiment, the waterproof and breathable membrane 51 can be a PTEE membrane or a Wers fluorine-free waterproof and breathable membrane 51, and is not limited to the above two material layers. Any other material that can be breathable and waterproof can be used.

[0048] As can be seen from the above description, the gas after preliminary gas-liquid separation is blocked by the breathable plate 50 and the waterproof and breathable membrane 51 to prevent condensate from being discharged out of the tank 1 along with the gas. The blocked condensate falls into the water collection box 13 for collection under the action of gravity.

[0049] like Figure 8 As shown, the lower outer side of the barrel 1 is provided with a filling port a, a sight port b, a drain port and an oil outlet connected to the return oil pipe 42. The filling port a is provided with a sealing cap d, the sight port b is provided with a sight glass, and the top of the barrel 1 is also provided with a detection port for detecting the pressure inside the barrel 1. These ports are all provided in the existing barrel 4 and are conventional settings, so they will not be described in detail here.

[0050] Example 2 differs from Example 1 in that, as Figure 9 and Figure 10As shown, the pressure plate 11 includes an upper plate 21 and a lower plate 22. A set of screws 23 are evenly arranged at the upper end of the lower plate 22. The screws 23 are threadedly connected to nuts 25, and their top ends abut against the bottom end face of the bucket lid. The upper plate 21 has a through hole 24 for the screws 23 to pass through. Both the upper plate 21 and the lower plate 22 are provided with vents 12. The water collection box 13 is installed on the upper plate 21. The limiting ring 17 is installed at the bottom of the lower plate 22. The lower plate 22 has a clearance hole for the water collection box 13 to pass through. The edge of the upper plate 21 extends upward and is provided with an inverted L-shaped mounting part 26. The horizontal end of the mounting part 26 presses between the bottom end of the bucket lid and the top end of the cylinder 4.

[0051] As described above, after the cylinder 4 is detachably installed inside the upper end of the cylinder 1, and the first oil separator core 10 is detachably installed at the bottom of the cylinder 4, the multiple limiting rings 17 of the lower plate 22 are first sequentially fitted onto the outer circumferential surface of the top end of the first oil separator core 10, and then the upper plate 21 is installed. The through hole 24 of the upper plate 21 corresponds to the screw 23. The horizontal end of the mounting part 26 of the upper plate 21 is placed on the top surface of the cylinder 4. The screw 23 passes through the through hole 24. The hand passes through the vent 12 of the upper plate 21 to press the lower plate 22, and the nut 25 is tightened downwards until the first oil separator core 10 is pressed between the limiting plate 18 and the bottom of the cylinder 4. 5. After tightly fitting the bottom end of the cylinder 4, the barrel cover is detachably installed on the barrel 1. The bottom edge of the barrel cover is used to press the horizontal end of the mounting part 26 against the top surface of the cylinder 4, and the top surface of the screw 23 abuts against the bottom surface of the barrel cover. This completes the installation of the pressure plate 11, further ensuring the sealing between the bottom of the first oil separator core 10 and the bottom of the cylinder 4, thereby further ensuring the separation effect and the connection stability of the first oil separator core 10. In addition, to ensure the stability of the lifting and lowering of the lower plate 22 or the upper plate 21, guide rods and guide holes can be provided on the upper plate 21 or the lower plate 22 respectively (not shown in the figure, the same throughout the text).

[0052] Example 3 differs from Example 1 in that, as follows: Figure 11 As shown, the oil-gas separator includes a connecting plate 31, several steel wire rods 43, and several retractable spiral blades 33. The connecting plate 31 has several through slots 34, and a connecting ring 35 is rotatably connected to the through slots 34. A guide sleeve 36 is connected to the inner side of the spiral blades 33. An installation ring 44 for placing the steel wire rods 43 is detachably connected to the inner side of the connecting ring 35. A support net 45 is detachably connected to the top and bottom of the installation ring 44. The top of the spiral blades 33 is fixedly connected to the installation ring 44. A set of guide rods 37 for the guide sleeves 36 to slide up and down is connected to the outer side of the installation ring 44. An annular connecting part 39 extends from the bottom of the cylinder 4. The inner side of the connecting part 39 is detachably connected to the outer side of the connecting plate 31. An annular baffle 56 is installed on the connecting ring 35 and fits around the spiral blades 33. An oil drain hole 57 is provided at the bottom of the annular baffle 56. The outer surface of the spiral blades 33 slides up and down and is connected to the inner side of the annular baffle 56.

[0053] Furthermore, the connecting plate 31 has several large holes, and the connecting plate 31 has an interconnected oil return groove 40 and several annular grooves 52. The outer side of the barrel 1 has an oil return port 41 that is connected to the pump body 2. The oil return port 41 is connected to the bottom of the oil return groove 40 by an oil return pipe 42. The outer side of the upper end of the connecting ring 35 is provided with an oil guide part 53 that is inclined downward towards the outside of the connecting ring 35. The annular groove 52 is located directly below the oil guide part 53.

[0054] As described above, when the split oil-gas mixture enters from the bottom of the connecting plate 31, a portion of the mixture enters the bottom of the spiral blade 33 through the large hole, colliding with the spiral blade 33 to separate the oil and gas. The other portion passes through the support net 45 at the bottom of the mounting ring 44. This support net 45 serves to limit and support the steel wire column 45, allowing gas and oil droplets to pass through while separating from only a few large oil droplets that collide with the net. The remaining gas then passes through the steel wire column 43. In this embodiment, the steel wire column 43 refers to a bundle of steel wire stacked in a columnar shape, which separates smaller oil droplets. The oil droplets accumulate on the steel wire column 43 and fall to the bottom of the barrel 1 through the holes of the support mesh 45. The recovery of a portion of the large oil droplets accumulated on the surface of the spiral blade 33, the disassembly and assembly of the connecting plate 31, and the recovery of oil droplets from the first oil separator core 10 are the same as in Embodiment 1, and will not be described again here. Another small portion flows to the bottom of the barrel 1 through the air inlet hole. The large-diameter hole is used to prevent air intake blockage. The spiral blade 33 is designed to be retractable along the length of the guide rod 37. It continuously extends and retracts under the push of the airflow, which intensifies the instability of the mixed gas flow and ensures the gas-liquid separation effect.

[0055] Example 4 differs from Example 1 in that, as Figure 12 and 13 As shown, the filter ring includes an annular plate 46 and a high-temperature resistant, breathable, and waterproof layer 47. The upper end face of the annular plate 46 has a groove 48 for placing the high-temperature resistant, breathable, and waterproof layer 47. The annular plate 46 has several air holes. A second sealing ring 49 is provided between the bottom of the bucket lid and the top of the annular plate 46. There is no cooling pipe 55. In this embodiment, the high-temperature resistant, breathable, and waterproof layer 47 can be a PTEE membrane layer or a Wers fluorine-free waterproof and breathable membrane layer. It is not limited to the above two material layers. Any other material that is high-temperature resistant and breathable and waterproof can be used.

[0056] As can be seen from the above description, when the gas after oil-gas separation in the first oil separator 10 rises to near the exhaust pipe 3, the gas first passes through the air holes of the annular plate 46, and then is blocked by the high-temperature resistant, breathable and waterproof layer 47. The gas carries condensate water for separation, realizing the initial gas-liquid separation. The separated liquid gathers in the water filter ring and flows into the water collection box 13.

[0057] Example 5 differs from Example 1 in that, as Figure 14 As shown, the annular plate 46 in the water filter ring is a frame plate without pores. The frame plate contains multiple layers of metal filter screens 59, and the cooling pipes 55 are still installed on the outer side of the annular plate 46.

[0058] Example 6 differs from Example 1 in that, as Figure 15 As shown, there is no oil-gas separator below cylinder 4.

[0059] In summary, compared with the prior art, this invention combines the functions of filtration, oil recovery, and water collection in a single cylinder, improving the stability of the filter element installation, ensuring sufficient separation of gas and oil, guaranteeing energy conservation, environmental protection, and overall filtration effect. The overall structure is compact, greatly saving space and facilitating filter element replacement. It has the advantages of good separation effect, compact structure, and easy filter element replacement. Its working process is as follows: the oil-gas mixture enters the inlet pipe 8 from the outlet 61 of the pump body 2. After entering the inlet pipe 8, it first impacts the oil filter plate, separating some larger oil droplets, which fall onto the oil guide groove 30 on the partition plate 5, and then fall to the bottom of the cylinder 1 through the oil outlet 29, achieving preliminary oil filtration. The mixture then impacts the outer wall of the cylinder 4 at a certain speed and angle, separating larger oil droplets after the collision and falling to the bottom of the cylinder 1, achieving secondary oil filtration. Finally, the oil-gas mixture is diverted... After being guided, the gas enters from the bottom of the oil-gas separators at the bottom of the two cylinders 4. The mixed gas undergoes three oil filtrations in the oil-gas separators, and then enters the first oil separator core 10 for a fourth oil-gas filtration. After the third and fourth filtrations, some oil droplets are recovered to the vacuum pump via the return oil groove 40 and return oil pipe 42 of the connecting plate 31, while the other oil droplets fall to the bottom of the cylinder 1. After the oil-gas separation is completed, the gas undergoes two gas-liquid separations, first through the water filter ring and then through the gas-liquid separation structure, to prevent liquid from being discharged with the gas. The water collection box 13 and the drain pipe 14 prevent the backflow of condensate into the cylinder 1, which would prevent the separated oil from being recycled and affect the oil-gas separation effect. The pressure plate 11 ensures that the bottom of the first oil separator core 10 is tightly attached to the bottom of the cylinder 4, preventing gaps from appearing between the first oil separator core 10 and the bottom of the cylinder 4 due to vibration, which would affect the oil-gas separation effect.

[0060] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An energy-efficient piston vacuum pump comprising a pump body, characterized in that: The pump body is provided with an air inlet and an air outlet, further comprising a barrel body, two barrel covers are arranged on the barrel body, an exhaust pipe is communicated with the barrel covers, two cylinder bodies and a partition plate between the outer sides of the cylinder bodies are connected to the upper end of the barrel body, a flow distribution plate is arranged on the upper end of the partition plate, a flow distribution channel is formed between the flow distribution plate and the outer side of the cylinder body, an air inlet pipe is arranged on the upper end of the barrel body and communicated with the two flow distribution channels, an oil filter plate is arranged between the air inlet pipe and the flow distribution plate, the air outlet is communicated with the air inlet pipe, a plurality of mounting holes are uniformly arranged on the bottom of the cylinder body, a first oil separation core is detachably mounted in the mounting hole, a pressing plate is arranged between the top end of the cylinder body and the bottom of the barrel cover and used for pressing the top of the first oil separation core, the pressing plate is provided with an air vent, a gas-liquid separation structure is arranged in the exhaust pipe, a water collecting box is arranged below the exhaust pipe and connected to the bottom of the pressing plate, and a water filter ring is arranged between the top end of the water collecting box and the outer side of the exhaust pipe. A gas-oil separator is detachably mounted below the cylinder body, the bottom of the cylinder body is extended to form a connecting portion in the shape of a ring, the gas-oil separator comprises a connecting plate and a plurality of telescopic spiral blades, a plurality of through grooves are arranged in the connecting plate, a connecting ring is rotatably connected to the through grooves, a guide sleeve is connected to the inner side of the spiral blade, and the inner side of the connecting portion is detachably connected to the outer side of the connecting plate; an annular baffle is arranged on the connecting ring and sleeved on the outer side of the spiral blade, an oil discharge hole is arranged at the bottom of the annular baffle, and the outer side of the spiral blade is slidably connected to the inner side of the annular baffle. The gas-oil separator further comprises a plurality of second oil separation cores and a plurality of guide rods for the upward and downward sliding of the guide sleeves, the bottom of the second oil separation core is threadedly connected to the inner side of the connecting ring, the bottom end of the guide rod is connected to the connecting ring, and the top end of the guide rod is connected to a pressing ring used for pressing the top of the second oil separation core, and the bottom end of the pressing ring is fixedly connected to the top of the spiral blade. Or the gas-oil separator further comprises a plurality of steel wire columns, the inner side of the connecting ring is detachably connected to a mounting ring for placing the steel wire columns, the top and bottom of the mounting ring are detachably connected to supporting nets, the top end of the spiral blade is fixedly connected to the mounting ring, and the outer side of the mounting ring is connected to a group of guide rods.

2. An energy-efficient piston vacuum pump according to claim 1, characterized in that: The bottom of the first oil separation core is threadedly connected to the mounting hole, the lower end of the first oil separation core extends radially outward to form a stop ring abutting against the inner bottom of the cylinder body, a first sealing ring is arranged between the bottom of the stop ring and the inner bottom of the cylinder body, a plurality of limiting rings are arranged on the bottom of the pressing plate and used for placing the top end of the first oil separation core, a plurality of arc-shaped limiting plates are arranged in the limiting rings, a plurality of limiting grooves are uniformly arranged on the inner side of the limiting ring, the limiting plates are arranged between the limiting ring and the first oil separation core, and damping springs are arranged between the groove bottoms of the limiting grooves and the limiting plates.

3. An energy-efficient piston vacuum pump according to claim 2, characterized in that: The pressing plate comprises an upper plate and a lower plate, the upper end of the lower plate is uniformly provided with a group of screw rods, the screw rods are threadedly connected with nuts, and the top end abuts against the bottom end surface of the barrel cover, the upper plate is provided with through holes for the screw rods to pass through, the upper plate and the lower plate are both provided with the air vents, the water collecting box is installed on the upper plate, the limiting ring is installed on the bottom of the lower plate, the lower plate is provided with a gap hole for the water collecting box to pass through, the edge of the upper plate is upwardly extended and provided with an installation portion in inverted L-shaped arrangement, and the horizontal end of the installation portion is pressed between the bottom end of the barrel cover and the top end of the cylinder.

4. An energy-efficient piston vacuum pump according to claim 1, characterized in that: The oil filter plate is a perforated arc-shaped plate, one side of the arc-shaped plate close to the air inlet pipe is provided with a plurality of convex strip portions arranged in wave-shaped cross section, the baffle is provided with an oil outlet hole below the air inlet pipe, the oil outlet hole is located outside the shunt channel, and the baffle is provided with an oil guide groove which is downwardly inclined towards the oil outlet hole; one side of the oil guide groove is located below the arc-shaped plate, and the other side is communicated with the oil outlet hole.

5. An energy-efficient piston vacuum pump according to claim 1, characterized in that: The second oil separation core and the spiral blade are both arranged in interlaced manner with the first oil separation core, the connecting plate is provided with an oil return groove and a plurality of annular grooves which are communicated with each other, the outer side of the barrel body is provided with an oil return port which is communicated with the pipeline of the pump body, the oil return port is communicated with the bottom of the oil return groove through an oil return pipe, the outer side surface of the upper end of the connecting ring is provided with an oil guide portion which is downwardly inclined towards the outside of the connecting ring, and the annular groove is located directly below the oil guide portion.

6. An energy-efficient piston vacuum pump according to claim 1, characterized in that: The connecting plate is provided with an oil return groove and a plurality of annular grooves which are communicated with each other, the outer side of the barrel body is provided with an oil return port which is communicated with the pipeline of the pump body, the oil return port is communicated with the bottom of the oil return groove through an oil return pipe, the outer side surface of the upper end of the connecting ring is provided with an oil guide portion which is downwardly inclined towards the outside of the connecting ring, and the annular groove is located directly below the oil guide portion.

7. An energy-efficient piston vacuum pump according to claim 1, characterized in that: The water filter ring comprises an annular plate and a cooling pipe, a plurality of air holes are formed in the side surface of the annular plate, the cooling pipe is spirally arranged around the outer side of the annular plate, the cooling pipe passes through the barrel body at both ends and is connected in pipeline with a cooling water tank and a circulating water pump, the drain pipe is connected in pipeline with the cooling water tank, and a second sealing ring is arranged between the bottom of the barrel cover and the top end of the annular plate.

8. An energy-efficient piston vacuum pump according to claim 1, characterized in that: The gas-liquid separation structure comprises a gas permeable plate and a waterproof gas permeable film for blocking liquid from being discharged outwardly, the waterproof gas permeable film is detachably connected to the upper end surface of the gas permeable plate, and the gas permeable plate is detachably installed in the air outlet pipe.

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