Energy storage positive and negative pressure air supply system with water ring vacuum pump

Abstract

This invention relates to the field of vacuum pump gas source equipment technology, specifically to a storage-type positive and negative pressure gas source supply system with a water ring vacuum pump, including a water ring pump body and a blower. The water ring pump body is externally equipped with a pre-purification mechanism, a pre-separation mechanism, and a cooling mechanism. The invention features a pre-purification mechanism at the inlet end, where gas enters tangentially and forms a centrifugal airflow along a spiral structure. Dust and large droplets are separated by a two-stage guide plate. The spiral guide plate has a built-in cooling pipe, where fine water mist condenses on the low-temperature pipe wall, achieving dual purification through centrifugal separation and low-temperature condensation. Impurities and water mist waste liquid are sent to a filter assembly, where the filter screen traps solid residues, and the clean liquid flows back to the pre-purification pipe for secondary purification. This structure significantly reduces the amount of dust and water mist entering the pump cavity, avoids pipe blockage, slows down the dilution rate of the working water, extends the service life of the vacuum pump, and reduces the cost of media replacement and maintenance consumables.

Description

Technical Field

[0001] This invention relates to the field of vacuum pump gas source equipment technology, specifically to a storage-type positive and negative pressure gas source supply system with a water ring vacuum pump. Background Technology

[0002] Printing gas supply solutions often adopt energy storage-type positive and negative pressure gas supply systems to replace the original integrated suction and blowing vacuum pump sets. Specifically, there are negative pressure subsystems and positive pressure subsystems. The negative pressure subsystem consists of two suction pump sets, two main vacuum negative pressure storage tanks, and one backup negative pressure tank. It is responsible for generating negative pressure and replacing the core adsorption function of the original integrated suction and blowing vacuum pump set. It relies on the energy storage of the tank to realize the intermittent start and stop of the pump, without the need for 24-hour continuous operation. The positive pressure subsystem is an independent high-pressure blower unit, a blower unit that provides positive pressure airflow to realize the blowing of paper, separation of paper stacks, and blowing of paper scraps in the printing press. The suction pump set is mainly a water ring vacuum pump.

[0003] The inventors have discovered at least the following problems in the prior art: In existing energy storage positive and negative pressure air supply systems, the water ring vacuum pumps have their air inlets directly connected to the vacuum station. Dust-laden and high-water-mist gases enter the pump chamber directly without pretreatment. Solid dust continuously washes over the impeller and pump casing, causing impeller wear and pump corrosion over long-term operation, significantly shortening the overall service life of the machine. A large amount of water mist mixes into the working water inside the pump, continuously diluting the working medium and causing the ultimate vacuum of the equipment to decline. Frequent drainage and replacement of the working water are required, resulting in high maintenance consumable and labor costs. Long-term accumulation of impurities can also easily clog the pump's internal flow channels, causing cavitation, abnormal noise, and reduced pumping efficiency. Furthermore, the high-temperature water-gas mixture discharged from the exhaust pipe of the water ring vacuum pump is not pre-separated. On the one hand, a large amount of recyclable working water is directly transported to the downstream equipment in the exhaust. The downstream water-gas separator has a very high processing load and its separation efficiency is limited. A large amount of liquid medium is discharged with the exhaust gas, resulting in a continuous waste of water resources. On the other hand, the high-temperature saturated water vapor is not condensed in advance. The high-temperature gas entering the pump body circulation will aggravate the heating of the whole machine and further deteriorate the vacuum performance.

[0004] Therefore, this solution provides a storage-type positive and negative pressure gas supply system with a water ring vacuum pump to solve the above problems. Summary of the Invention

[0005] To address the problems of dust and water mist during air intake and high load on water-air separation equipment during exhaust in existing technologies, this invention provides a water ring vacuum pump to solve the above problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A storage-type positive and negative pressure air supply system with a water ring vacuum pump includes a water ring pump body and a blower. The water ring pump body is externally equipped with a pre-purification mechanism, a pre-separation mechanism, and a cooling mechanism. The output end of the blower is connected to two parallel air storage tanks, and the output end of each air storage tank is connected to a spare tank. A water storage tank is externally equipped on the water ring pump body. The water ring pump body includes a motor and a pump casing mounted on the motor end. A pump cover is installed on one side of the pump casing. An air inlet pipe and an air outlet pipe are fixed inside the pump cover. A liquid replenishment pipe head and a cavitation protection pipe head are provided on the outer end of the pump cover. The liquid replenishment pipe head is connected to the water storage tank via a flexible hose. The pre-purification mechanism includes a pre-purification pipe, a spiral guide plate, a spiral waste guide plate, and a filter assembly. The spiral guide plate and the spiral waste guide plate are located inside the pre-purification pipe, and the pre-purification mechanism is located above the air inlet pipe. The pre-separation mechanism includes a separation pipe and a base plate fixedly connected vertically, and also includes spiral guide vanes inside the separation pipe. The pre-separation mechanism is located above the air outlet pipe. The cooling mechanism includes a water tank and a water pump installed above it.

[0007] Preferably, the inner wall of the exhaust pipe is provided with a liquid guiding groove, the bottom plate is provided with a connecting port, a flow guiding groove is provided on one side of the connecting port, the flow guiding groove is connected to the liquid guiding groove, the connecting port is connected to the interior of the exhaust pipe, and the bottom of the bottom plate is installed above the exhaust pipe.

[0008] Preferably, an air inlet head and a backflow head are provided at the chamfered corners on both sides of the upper end of the pre-purification pipe. The bottom end of the pre-purification pipe is installed above the air inlet pipe. The outer periphery of the spiral waste guide plate is fixedly connected to the inner wall of the pre-purification pipe. An inner slot is opened on the inner side of the spiral waste guide plate. A waste guide groove is opened inside the spiral waste guide plate. A discharge connecting pipe is fixedly connected to one end of the spiral waste guide plate. The discharge connecting pipe passes through the pre-purification pipe.

[0009] Preferably, the outer periphery of the spiral guide plate is fixedly connected to the inside of the inner slot, and the upper part of the spiral guide plate is fixedly connected to the secondary guide plates that are evenly distributed. The spiral guide plate is provided with a cooling pipe, one end of which is a liquid inlet pipe and the other end of which is a liquid outlet pipe. Both the liquid inlet pipe and the liquid outlet pipe are located inside the discharge connecting pipe.

[0010] Preferably, the filter assembly includes a filter box and a filter insert plate inserted inside the filter box. One side of the filter box is connected to a discharge connection pipe, and the other side of the filter box is provided with a backflow conduit. One end of the backflow conduit is connected to a backflow pipe head. A top rod is installed on the top of the filter box, and the filter insert plate passes through the top rod.

[0011] Preferably, the spiral guide plate is fixedly connected to the inside of the separation tube, and an inverted conical tube is fixedly connected to the inside of the separation tube, with the inverted conical tube located above the spiral guide plate.

[0012] Preferably, the spiral guide plate has a flow guiding spiral groove on its upper part, the bottom end of the spiral guide plate passes through the separation tube, the bottom part of the spiral guide plate is located above the connection port, and the end of the spiral guide plate outside the separation tube is connected to the liquid inlet connector and the liquid outlet connector.

[0013] Preferably, the water pump has an inlet connector pipe installed at its input end and an outlet connector pipe installed at its output end. The outlet connector pipe passes through the inside of the water tank, and the other end of the inlet connector pipe is connected to the liquid outlet connector, while the other end of the outlet connector pipe is connected to the liquid inlet pipe.

[0014] Preferably, the lower end of the outlet pipe is connected to a reverse inlet pipe, the reverse inlet pipe passes through the inside of the water tank and is connected to a circulation pipe, and the other end of the circulation pipe is connected to the inlet connector.

[0015] Preferably, an impeller is provided inside the pump casing, the impeller is mounted on the output shaft of the motor, and a disc is installed on the inner side of the pump cover.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention features an independent pre-purification mechanism above the intake pipe. The gas to be pumped enters tangentially from the pre-purification pipe's angled intake head, forming a downward spiral centrifugal airflow along the spiral waste guide plate and the spiral guide plate. This, combined with a wave-shaped inclined secondary guide plate, completes two-stage centrifugal separation. Solid dust and large water droplets in the airflow are thrown into the waste guide trough under centrifugal force. The spiral guide plate integrates a cooling pipe, with circulating low-temperature coolant continuously reducing the pipe wall temperature. As the airflow passes through the pipe wall, the fine water droplets inside quickly condense and precipitate, achieving dual purification through centrifugal separation and low-temperature condensation. This structure significantly reduces the dust and water droplet content entering the pump cavity, reducing dust wear and corrosion on the impeller and pump casing, and preventing pump cavity blockage and cavitation failures. The working water dilution rate is reduced, eliminating the need for frequent medium replacement, effectively extending the overall service life of the machine, and reducing daily maintenance consumables and labor costs.

[0017] In this invention, impurities and water mist waste liquid separated in the pre-purification mechanism are sent into the filter assembly through the discharge connection pipe. The multi-layer wire mesh filter plate intercepts all solid residues. The purified clean liquid phase medium is returned to the pre-purification tube through the reflux conduit and reflux head, and participates in the intake cooling and purification process for a second time.

[0018] This invention employs a pre-separation mechanism above the exhaust pipe. The water-gas mixture discharged from the pump enters the separation pipe through the bottom plate connection. A spiral guide vane guides the airflow upwards, generating centrifugal force. Inside the spiral guide vane is a spiral cooling pipe connected to a cooling circuit. The low-temperature pipe wall rapidly cools the high-temperature airflow, causing residual water mist within the airflow to condense into liquid water. This liquid water collects along the spiral guide vane's guide grooves, flows back to the pump casing via the bottom plate guide grooves and the inner wall of the exhaust pipe, and is reused. An inverted cone at the top of the separation pipe blocks the upward airflow, capturing suspended fine droplets and completing secondary water-gas separation. This pre-separation at the exhaust end recovers most of the recyclable working water in advance, avoiding direct discharge of liquid media and the resulting water waste. It significantly reduces the water-gas content in the intake air of large downstream water-gas separation equipment, reducing the processing load on downstream equipment and improving the overall water-gas separation efficiency of the vacuum system. Simultaneously, it lowers the exhaust temperature in advance, suppressing overall temperature rise and ensuring stable vacuum levels during long-term operation.

[0019] This invention uses a cooling mechanism to continuously cool the two core components, intake pre-purification and exhaust pre-separation, eliminating the need for separate water cooling devices for each mechanism and simplifying the equipment piping layout. The coolant circulates in a closed loop with no direct discharge loss, significantly reducing cooling water consumption and saving water resources compared to traditional open water cooling structures. The continuous low-temperature operation enhances the intake condensation and demisting effect and the exhaust water-gas separation effect, while suppressing pump body temperature rise and ensuring the ultimate vacuum performance of the equipment for long-term continuous operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall system of the present invention; Figure 2 For the present invention Figure 1 Partial structural diagram; Figure 3 This is a schematic diagram of the disassembled structure of the water ring pump body of the present invention; Figure 4 This is a schematic diagram of the internal structure of the pump cover of the present invention; Figure 5 This is a schematic diagram of the internal structure of the pre-purification mechanism of the present invention; Figure 6 This is a schematic diagram of the pre-purification tube of the present invention; Figure 7 This is a schematic diagram of the spiral guide plate of the present invention; Figure 8 This is a schematic diagram of the spiral waste guide plate of the present invention; Figure 9 This is a schematic diagram of the disassembled structure of the filtering component of the present invention; Figure 10 This is a schematic diagram of the internal structure of the pre-separation mechanism of the present invention; Figure 11 This is a schematic diagram of the internal structure of the spiral guide plate of the present invention; Figure 12 This is a schematic diagram of the cooling mechanism of the present invention.

[0021] In the picture: 1. Water ring pump body; 11. Motor; 12. Pump casing; 13. Impeller; 14. Disc; 15. Pump cover; 16. Air inlet pipe; 17. Exhaust pipe; 171. Liquid guide groove; 18. Liquid replenishment pipe head; 19. Cavitation protection pipe head; 2. Pre-purification mechanism; 21. Pre-purification pipe; 211. Air inlet pipe head; 212. Reverse flow pipe head; 22. Spiral guide plate; 23. Secondary guide plate; 24. Cooling pipe; 241. Liquid inlet pipe; 242. Liquid outlet pipe; 25. Spiral waste guide plate; 251. Internal mounting slot; 252. Waste guide trough; 26. Discharge connection pipe; 27. Filter assembly; 271. Filter box; 272. Backflow duct; 273. Top rod; 274. Filter insert plate; 3. Pre-separation mechanism; 31. Separation tube; 32. Inverted cone tube; 33. Base plate; 331. Connection port; 332. Guide groove; 34. Spiral guide plate; 341. Guide spiral groove; 35. Liquid inlet connector; 36. Liquid outlet connector; 4. Cooling mechanism; 41. Water tank; 42. Water pump; 43. Inlet connecting pipe; 44. Outlet connecting pipe; 45. Reverse inlet pipe; 46. Circulation pipe.

[0022] 5. Blower; 6. Air tank; 7. Spare tank; 8. Water tank; Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] Example: Please refer to Figures 1-12 The above describes a storage-type positive and negative pressure air supply system with a water ring vacuum pump, including a water ring pump body 1 and a blower 5. The water ring pump body 1 is equipped with a pre-purification mechanism 2, a pre-separation mechanism 3 and a cooling mechanism 4. The output end of the blower 5 is connected to two parallel air storage tanks 6. The output end of the air storage tanks 6 is connected to a spare tank 7. The water ring pump body 1 is equipped with a water storage tank 8. The main body 1 of the water ring pump includes a motor 11 and a pump casing 12 installed at the end of the motor 11. A pump cover 15 is installed on one side of the pump casing 12. An air inlet pipe 16 and an exhaust pipe 17 are fixed inside the pump cover 15. A liquid replenishment pipe head 18 and a cavitation protection pipe head 19 are provided at the outer end of the pump cover 15. The liquid replenishment pipe head 18 is connected to the water storage tank 8 through a hose. The pre-purification mechanism 2 includes a pre-purification pipe 21, a spiral guide plate 22, a spiral waste guide plate 25, and a filter assembly 27. The spiral guide plate 22 and the spiral waste guide plate 25 are located inside the pre-purification pipe 21, and the pre-purification mechanism 2 is located above the air inlet pipe 16. The pre-separation mechanism 3 includes a separation pipe 31 and a base plate 33 that are fixedly connected at the top and bottom, and also includes a spiral guide plate 34 inside the separation pipe 31. The pre-separation mechanism 3 is located above the exhaust pipe 17. Cooling mechanism 4 includes a water tank 41 and a water pump 42 installed above it; The existing energy storage positive and negative pressure air supply system consists of a water ring pump body 1, a blower 5, an air storage tank 6, a spare tank 7, and a water tank 8. It includes a negative pressure generating energy storage unit (water ring pump body 1), a positive pressure blower unit (blower 5), a PLC automatic control unit, and a printing equipment air terminal. The negative pressure generating energy storage unit is the core of this system, comprising two sets of parallel-connected water ring pump bodies (i.e., suction pump sets), two parallel-connected main vacuum air storage tanks, and one independent spare vacuum tank. The blower unit constitutes an independent positive pressure blower unit. Each tank and pump body is connected via… The negative pressure pipeline with control valve and vacuum pressure sensor is connected, and the blower has a separate positive pressure gas supply branch. The function of the backup tank 7 is to automatically open the solenoid valve during peak gas consumption. The backup tank 7 is connected in parallel with the two main gas storage tanks 6 to expand the capacity and stabilize the pipeline vacuum. When a single main gas storage tank 6 is being drained or under maintenance, the solenoid valve switches to the backup tank 7 to supply gas to the production line alone, and the production line does not need to be stopped. The water storage tank 8 is connected to the replenishment pipe head 18 of the two water ring pump bodies 1 through the replenishment pipe hose to continuously replenish the circulating working water of the water ring pump, balance the liquid level in the pump, and suppress cavitation. The water ring pump body 1 and its components constitute the water ring vacuum pump in the prior art; one side of the pre-purification mechanism 2 is connected to the external part that needs to be evacuated through a pipe, while the top of the pre-separation mechanism 3 is connected to the external large water-gas separation equipment through a pipe; the pre-separation mechanism 3 is used for pre-water-gas separation; the pre-purification mechanism 2 is used to purify the incoming airflow.

[0025] In this embodiment, a liquid guiding groove 171 is provided on the inner wall of the exhaust pipe 17, a connecting port 331 is provided on the bottom plate 33, a flow guiding groove 332 is provided on one side of the connecting port 331, the flow guiding groove 332 is connected to the liquid guiding groove 171, the connecting port 331 is connected to the interior of the exhaust pipe 17, and the bottom of the bottom plate 33 is installed above the exhaust pipe 17. The liquid guide groove 171 is used to cooperate with the connection port 331 and the flow guide spiral groove 341 to guide the separated water back into the pump casing 12.

[0026] In this embodiment, an air inlet head 211 and a backflow head 212 are provided at the chamfered corners on both sides of the upper end of the pre-purification pipe 21. The bottom end of the pre-purification pipe 21 is installed above the air inlet pipe 16. The outer periphery of the spiral waste guide plate 25 is fixedly connected to the inner wall of the pre-purification pipe 21. An inner slot 251 is provided on the inner side of the spiral waste guide plate 25. A waste guide groove 252 is provided inside the spiral waste guide plate 25. A discharge connecting pipe 26 is fixedly connected to one end of the spiral waste guide plate 25. The discharge connecting pipe 26 penetrates the pre-purification pipe 21. Among them, the airflow entering from the intake pipe head 211 can form a spiral downward airflow along the tangential direction and guided by the spiral guide plate 22, while the re-entry pipe head 212 makes the re-entering airflow overlap with the spiral downward airflow of the pre-purification pipe 21. The spiral waste guide plate 25 is used to guide the separated impurities and water, and introduce them into the interior of the filter box 271 through the discharge connection pipe 26.

[0027] In this embodiment, the outer periphery of the spiral guide plate 22 is fixedly connected to the inside of the inner mounting slot 251, and the upper part of the spiral guide plate 22 is fixedly connected to the secondary guide plates 23 distributed at equal intervals. The spiral guide plate 22 is provided with a cooling pipe 24. One end of the cooling pipe 24 is a liquid inlet pipe 241, and the other end of the cooling pipe 24 is a liquid outlet pipe 242. Both the liquid inlet pipe 241 and the liquid outlet pipe 242 are located inside the discharge connecting pipe 26. The top view of the secondary guide plate 23 is wavy, and it is tilted at 45 degrees, thereby guiding the airflow in a secondary manner and separating impurities in the airflow.

[0028] In this embodiment, the filter assembly 27 includes a filter box 271 and a filter insert plate 274 inserted inside the filter box 271. One side of the filter box 271 is connected to the discharge connection pipe 26, and the other side of the filter box 271 is provided with a backflow conduit 272. One end of the backflow conduit 272 is connected to the backflow pipe head 212. A top rod 273 is installed on the top of the filter box 271, and the filter insert plate 274 passes through the top rod 273. The top rod 273 is bolted to the top of the filter box 271 and can be disassembled to clean the impurities and liquid collected in the filter box 271; the filter plate 274 is a multi-layer wire mesh for further capturing water mist.

[0029] In this embodiment, the spiral guide plate 34 is fixedly connected to the inside of the separation tube 31, and the inside of the separation tube 31 is fixedly connected to the inverted tapered tube 32, which is located above the spiral guide plate 34. Among them, the inverted cone pipe 32 is an inverted cone-shaped pipe. After the spiral guide plate 34 guides the airflow spirally upward, some of the airflow can be blocked, and then it will be discharged from the top of the separation pipe 31.

[0030] In this embodiment, a flow-guiding spiral groove 341 is provided above the spiral guide plate 34, the bottom end of the spiral guide plate 34 penetrates the separation tube 31, the bottom part of the spiral guide plate 34 is located above the connection port 331, and the end of the spiral guide plate 34 located outside the separation tube 31 is connected to the liquid inlet connector 35 and the liquid outlet connector 36. The guide spiral groove 341 is used to guide the falling liquid; the spiral guide plate 34 also has a copper tube inside, the two ends of which are the liquid inlet connector 35 and the liquid outlet connector 36. The shape of the copper tube is the same as that of the spiral guide plate 34, both being spirals.

[0031] In this embodiment, the input end of the water pump 42 is equipped with an inlet connector 43, and the output end of the water pump 42 is equipped with an outlet connector 44. The outlet connector 44 passes through the inside of the water tank 41. The other end of the inlet connector 43 is connected to the liquid outlet connector 36, and the other end of the outlet connector 44 is connected to the liquid inlet pipe 241. The water pump 42, after being operated, drives the liquid in the inlet connecting pipe 43 to enter the outlet connecting pipe 44, cooling pipe 24, reverse inlet pipe 45, circulation pipe 46, liquid inlet connector 35 and liquid outlet connector 36 in sequence, and then re-enters the inlet connecting pipe 43, continuously circulating.

[0032] In this embodiment, the lower end of the outlet pipe 242 is connected to the reverse inlet pipe 45, the reverse inlet pipe 45 passes through the inside of the water tank 41 and is connected to the circulation pipe 46, and the other end of the circulation pipe 46 is connected to the inlet connector 35. The water tank 41 contains liquid for heat exchange with the outlet connecting pipe 44, the reverse inlet pipe 45 and the circulation pipe 46 to cool it down; the part of the outlet connecting pipe 44 located in the water tank 41 and the part of the reverse inlet pipe 45 located in the water tank 41 are both "S" shaped.

[0033] In this embodiment, an impeller 13 is provided inside the pump casing 12, the impeller 13 is mounted on the output shaft of the motor 11, and a disc 14 is mounted on the inner side of the pump cover 15. The output shaft of the motor 11 is eccentric to the center of the pump casing 12, so the impeller 13 is also located at the eccentric part of the pump casing 12; holes are provided on both sides of the disc 14 to facilitate the airflow in and out.

[0034] The working principle of this invention is as follows: Air circuit connection structure: The air inlets of the two water ring pumps converge into the main negative pressure pipeline, which is then split into two parallel lines connected to the two main air storage tanks. The outlets of the two main air storage tanks merge and split into two lines: one line connects to the negative pressure air terminal of the printing workshop, specifically the paper suction and board suction stations of the printing machine; the other line connects to the backup tank via a switching valve. The backup tank serves as a redundant energy storage structure, expanding capacity in parallel with the two main tanks during peak air usage. When the main tanks are under maintenance or being drained, it independently provides negative pressure for the entire production line. The blower unit outputs an independent positive pressure pipeline, which is separately connected to the paper separating and paper dust blowing stations of the printing machine. The positive and negative pressure air sources are completely physically separated and do not interfere with each other. Air Supply Process: During initial equipment startup, the PLC controls two water ring pumps to start simultaneously, continuously drawing air from the dual main air storage tanks, causing the vacuum level inside the tanks to rise continuously. When the sensor detects that the vacuum level inside the tanks reaches the preset upper limit threshold, the PLC automatically cuts off the power to the two water ring pump motors, stopping the vacuum pumps. The vacuum pumps then rely on the negative pressure suction stored inside the air storage tanks to continuously supply air to the printing station. As the printing station continuously consumes the negative pressure, the vacuum level inside the tanks gradually decreases. When the vacuum sensor reading falls below the set lower limit threshold, the PLC automatically restarts the water ring pumps to replenish the air in the tanks. The system continuously replenishes air until it reaches its limit again and shuts down, repeating the cycle. The vacuum pump operates 24 hours a day without cooling pipes, significantly reducing idle energy consumption. During peak air consumption conditions, when multiple printing machines are running simultaneously and the negative pressure consumption rate is fast, and the negative pressure drop rate of the two main tanks exceeds the air replenishment capacity of a single pump, the two water ring pumps operate synchronously to quickly replenish the pressure. When a single water ring pump fails for maintenance, the other pump can independently replenish the tank. When any main air storage tank needs to be drained or repaired, the PLC-controlled pipeline solenoid valve switches to the standby tank for separate air supply, and the production line does not need to be shut down. Independent control of positive pressure blower unit: The blower unit and negative pressure water ring pump have no linkage logic. It can be started and stopped and the air pressure can be adjusted independently according to the printing and paper separation blowing requirements. It does not need to run synchronously with the vacuum pump, further reducing ineffective energy consumption. The negative pressure generation carrier of the above-mentioned system is the main body of two modified water ring pumps. In order to adapt to the harsh air intake conditions of printing workshops containing paper dust and water mist, the present invention adds a pre-purification mechanism, a pre-separation mechanism, a cooling mechanism and a water storage tank to each water ring pump. Through spiral centrifugal filtration and closed-loop water circulation cooling, dust and water vapor in the intake airflow are removed, the pump body operating temperature is stabilized, the whole system is guaranteed to output constant negative pressure for a long time, and the service life of the vacuum pump is extended.

[0035] The following section provides a detailed description of the main body of the water ring pump and its supporting purification and cooling improvement structures; When in use, the external controller can make the motor 11 operate, thereby causing the impeller 13 to rotate eccentrically inside the pump casing 12. This causes the liquid inside the pump casing 12 to form a water ring. The water ring is eccentric with the rotating shaft of the motor 11, which in turn creates a negative pressure at the air inlet pipe 16 to draw in external airflow, which is then discharged from the exhaust pipe 17. In addition, the controller also controls the operation of the water pump 42, thereby causing the liquid in the annular connecting pipe 44, the inlet pipe 241, the outlet pipe 242, the reverse inlet pipe 45, the circulation pipe 46, the inlet connector 35, the outlet connector 36, and the inlet connecting pipe 43 to circulate. The liquid is cooled as it passes through the inside of the water tank 41, thereby cooling the spiral guide plate 22 and the spiral guide vane 34 after the water pump 42 is operating. Before the external airflow enters the intake pipe 16, it first enters through the pipe from the beveled intake pipe head 211, and then enters the intake pipe 16 from the bottom of the pre-purification pipe 21. The incoming airflow is guided by the spiral guide plate 22, generating a downward spiral airflow. This airflow generates centrifugal force, causing water vapor and other particles in the airflow to be thrown into the waste guide trough 252. Impurities in the airflow are also guided into the waste guide trough 252 by the secondary guide plate 23 fixed above the spiral guide plate 22. Water vapor and impurities in the waste guide trough 252 are driven by the spiral airflow through the discharge connecting pipe 26 into the filter box 271, where they are filtered by the filter insert plate 274 and then re-enter the pre-purification pipe 212 through the backflow conduit 272 for further processing. In addition, the operation of the water pump 42 at this time will lower the temperature of the spiral guide plate 22, allowing the airflow to be cooled by heat exchange as it passes through the spiral guide plate 22, causing the liquid it contains to condense. When the airflow is discharged from the exhaust pipe 17, it first enters the interior of the separator pipe 31 through the connector 331. Due to the obstruction below the spiral guide plate 34, the discharged airflow can also rise in a spiral manner, thereby generating centrifugal force. In conjunction with the operation of the water pump 42, the temperature of the spiral guide plate 34 decreases, thereby cooling the airflow containing water vapor, which then falls into the guide spiral groove 341 above the spiral guide plate 34. At the same time, part of the airflow moves upward and is blocked and gathered by the inverted cone pipe 32, thereby causing another part of the water vapor to condense again and fall into the guide spiral groove 341, thus performing gas-liquid separation on the discharged gas. The liquid entering the guide spiral groove 341 will fall into the interior of the guide groove 332 and return to the pump casing 12 along the liquid guide groove 171.

[0036] The blower 5, air tank 6, spare tank 7, water tank 8, motor 11 and water pump 42 used in this invention are all existing known electrical equipment, and can all be purchased and used directly on the market. Their structure, circuit and control principle are all existing known technologies. Therefore, the structure, circuit and control principle of the blower 5, air tank 6, spare tank 7, water tank 8, motor 11 and water pump 42 will not be described in detail here.

[0037] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art and are also general components, which are common knowledge in this field.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A storage-type positive and negative pressure air supply system with a water ring vacuum pump, comprising a water ring pump body (1) and a blower (5), characterized in that: The water ring pump body (1) is provided with a pre-purification mechanism (2), a pre-separation mechanism (3) and a cooling mechanism (4) on the outside. The output end of the blower (5) is connected to two parallel air storage tanks (6). The output end of the air storage tank (6) is connected to a spare tank (7). The water ring pump body (1) is provided with a water storage tank (8). The main body (1) of the water ring pump includes a motor (11) and a pump casing (12) installed at the end of the motor (11). A pump cover (15) is installed on one side of the pump casing (12). An air inlet pipe (16) and an exhaust pipe (17) are fixed inside the pump cover (15). A liquid replenishment pipe head (18) and a cavitation protection pipe head (19) are provided at the outer end of the pump cover (15). The liquid replenishment pipe head (18) is connected to the water storage tank (8) through a hose. The pre-purification mechanism (2) includes a pre-purification pipe (21), a spiral guide plate (22), a spiral waste guide plate (25), and a filter assembly (27). The spiral guide plate (22) and the spiral waste guide plate (25) are located inside the pre-purification pipe (21), and the pre-purification mechanism (2) is located above the air inlet pipe (16). The pre-separation mechanism (3) includes a separation pipe (31) and a base plate (33) fixedly connected at the top and bottom, and also includes a spiral guide plate (34) inside the separation pipe (31). The pre-separation mechanism (3) is located above the exhaust pipe (17). The cooling mechanism (4) includes a water tank (41) and a water pump (42) installed above it.

2. The energy storage type positive and negative pressure gas supply system with a water ring vacuum pump according to claim 1, characterized in that: The inner wall of the exhaust pipe (17) is provided with a liquid guiding groove (171), the bottom plate (33) is provided with a connecting port (331), a flow guiding groove (332) is provided on one side of the connecting port (331), the flow guiding groove (332) is connected to the liquid guiding groove (171), the connecting port (331) is connected to the interior of the exhaust pipe (17), and the bottom of the bottom plate (33) is installed above the exhaust pipe (17).

3. The energy storage type positive and negative pressure gas supply system with a water ring vacuum pump according to claim 1, characterized in that: An air inlet head (211) and a reflux head (212) are provided at the chamfered corners on both sides of the upper end of the pre-purification pipe (21). The bottom end of the pre-purification pipe (21) is installed above the air inlet pipe (16). The outer periphery of the spiral waste guide plate (25) is fixedly connected to the inner wall of the pre-purification pipe (21). An inner slot (251) is opened on the inner side of the spiral waste guide plate (25). A waste guide groove (252) is opened inside the spiral waste guide plate (25). A discharge connecting pipe (26) is fixedly connected to one end of the spiral waste guide plate (25). The discharge connecting pipe (26) passes through the pre-purification pipe (21).

4. The energy storage type positive and negative pressure gas supply system with a water ring vacuum pump according to claim 1, characterized in that: The outer periphery of the spiral guide plate (22) is fixedly connected to the inside of the inner slot (251). The upper part of the spiral guide plate (22) is fixedly connected to the secondary guide plates (23) that are evenly distributed. The spiral guide plate (22) is provided with a cooling pipe (24). One end of the cooling pipe (24) is the liquid inlet pipe (241), and the other end of the cooling pipe (24) is the liquid outlet pipe (242). The liquid inlet pipe (241) and the liquid outlet pipe (242) are both located inside the discharge connecting pipe (26).

5. A storage-type positive and negative pressure gas supply system with a water ring vacuum pump according to claim 1, characterized in that: The filter assembly (27) includes a filter box (271) and a filter insert plate (274) inserted inside the filter box (271). One side of the filter box (271) is connected to the discharge connection pipe (26), and the other side of the filter box (271) is provided with a backflow conduit (272). One end of the backflow conduit (272) is connected to the backflow pipe head (212). A top rod (273) is installed above the filter box (271), and the filter insert plate (274) passes through the top rod (273).

6. The energy storage type positive and negative pressure gas supply system with a water ring vacuum pump according to claim 1, characterized in that: The spiral guide plate (34) is fixedly connected to the inside of the separation tube (31), and the inside of the separation tube (31) is fixedly connected to the inverted cone tube (32), which is located above the spiral guide plate (34).

7. A storage-type positive and negative pressure gas supply system with a water ring vacuum pump according to claim 1, characterized in that: The spiral guide plate (34) has a flow-guiding spiral groove (341) on its upper part. The bottom end of the spiral guide plate (34) passes through the separation tube (31). The bottom part of the spiral guide plate (34) is located above the connection port (331). The end of the spiral guide plate (34) outside the separation tube (31) is connected to the liquid inlet connector (35) and the liquid outlet connector (36).

8. A storage-type positive and negative pressure gas supply system with a water ring vacuum pump according to claim 1, characterized in that: The water pump (42) is equipped with an inlet connector (43) at its input end and an outlet connector (44) at its output end. The outlet connector (44) passes through the interior of the water tank (41). The other end of the inlet connector (43) is connected to the outlet connector (36), and the other end of the outlet connector (44) is connected to the inlet pipe (241).

9. A storage-type positive and negative pressure gas supply system with a water ring vacuum pump according to claim 4, characterized in that: The lower end of the outlet pipe (242) is connected to the inlet pipe (45), the inlet pipe (45) passes through the inside of the water tank (41) and is connected to the circulation pipe (46), and the other end of the circulation pipe (46) is connected to the inlet connector (35).

10. A storage-type positive and negative pressure gas supply system with a water ring vacuum pump according to claim 1, characterized in that: An impeller (13) is provided inside the pump casing (12), and the impeller (13) is installed on the output shaft of the motor (11). A disc (14) is installed on the inner side of the pump cover (15).

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