Chemical vacuum pump unit with compound filtering protection

Abstract

The utility model discloses a chemical vacuum pump unit with compound filtering protection, which comprises a water ring vacuum pump, an air inlet pipe, an air outlet pipe, a filter screen, a filter screen and an air outlet pipe, wherein the input end of the water ring vacuum pump is connected with the air inlet pipe; the steam-water separator is connected with the exhaust pipe; the compound filter is arranged at the head end of the air inlet pipe; the duplex filter comprises a shell, a first filter screen and a second filter screen, flange plates are arranged at the two ends of the shell, the shell is in sealed connection with the head end of the air inlet pipe through the flange plates, and the first filter screen and the second filter screen are fixedly arranged in the shell and are perpendicular to the airflow flowing direction. The first filter screen is located on the front side of the second filter screen, and the mesh number of the second filter screen is larger than that of the first filter screen; according to the utility model, the filtering efficiency is obviously improved, the blocking frequency of the filter screen is greatly relieved, and the abrasion and corrosion of the vacuum pump caused by particulate matters and corrosive substances are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pump units, in particular to a chemical vacuum pump unit with compound filtering protection. Background Art

[0002] In the chemical production process, vacuum pump units, as key equipment, undertake important tasks such as gas suction, compression and discharge, and play a vital role in ensuring the stability of the production process and product quality. However, in practical applications, vacuum pump units face many challenges, especially the problem of air intake filtration is particularly prominent.

[0003] The vacuum pump unit inhales corrosive exhaust gas during operation, which usually contains chemical byproducts. In particular, some acidic solid particles will flow with the exhaust gas and adhere to the valves and internal parts of the vacuum pump, which will affect the service life of the vacuum pump unit to a certain extent, and in severe cases will cause immeasurable safety accidents.

[0004] Traditional vacuum pump units are often only equipped with simple filters at the air inlet. Some of these filters are not suitable for the working environment of chemical phosphoric acid manufacturing. Because the filter mesh is too large, it cannot meet the requirements for filtering fine particles. Moreover, the filter mesh is too fine, and coarse particles can easily clog the filter. Therefore, a single filter greatly affects the normal operation of the vacuum pump unit.

[0005] How to ensure that the vacuum pump unit can maintain normal operation under harsh working conditions, especially to meet the special requirements in the production of chemical phosphoric acid, is an urgent problem to be solved. Utility Model Content

[0006] The purpose of the utility model is to provide a chemical vacuum pump unit with double filtration protection to solve the problems existing in the prior art, which significantly improves the filtration efficiency, greatly alleviates the frequency of filter blockage, and reduces the wear and corrosion of the vacuum pump caused by particulate matter and corrosive substances.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A chemical vacuum pump unit with duplex filtering protection comprises: a water ring vacuum pump, the input end of which is connected to an air inlet pipe, and the output end of which is connected to an exhaust pipe, for inhaling, compressing and discharging gas; a gas-water separator, connected to the exhaust pipe, for separating gas and water; a duplex filter, arranged at the head end of the air inlet pipe, for filtering coarse particles and corrosive substances in the incoming gas; the duplex filter comprises a shell, a first filter screen and a second filter screen, the shell (6) is sealed and connected to the head end of the air inlet pipe through a flange, the first filter screen and the second filter screen are fixedly arranged inside the shell and perpendicular to the air flow direction, the first filter screen is located in front of the second filter screen, and the mesh number of the second filter screen is greater than the mesh number of the first filter screen.

[0009] The inner wall of the shell is provided with a first slot and a second slot, which are respectively used to insert and limit the peripheral edges of the first filter screen and the second filter screen; the shell is provided with a first slit and a second slit, which are respectively used to insert and remove the first filter screen and the second filter screen.

[0010] The peripheral edge of the first filter screen extends out of the first slit and abuts against the first pressure plate, and the first pressure plate is fixed to the outer wall of the shell by bolts; the peripheral edge of the second filter screen extends out of the second slit and abuts against the second pressure plate, and the second pressure plate is fixed to the outer wall of the shell by bolts.

[0011] A first sealing gasket is provided between the first filter screen and the first slit; and a second sealing gasket is provided between the second filter screen and the second slit.

[0012] A differential pressure gauge is provided outside the shell, and the differential pressure gauge is connected to a first air duct and a second air duct. The first air duct is connected to an air chamber in the shell located in front of the first filter, and the second air duct is connected to an air chamber in the shell located behind the second filter.

[0013] The vacuum pump unit comprises an electric motor, and the output shaft of the electric motor is connected to the driving shaft of the water ring vacuum pump through an elastic coupling.

[0014] The vacuum pump unit comprises a plate heat exchanger, which is connected to the water ring vacuum pump through a pipeline. The plate heat exchanger is used to send the working water in the water ring vacuum pump back to the water ring vacuum pump after heat exchange to cool the working water.

[0015] The steam-water separator is connected with a water supply pipe and a liquid discharge pipe. The water supply pipe is used to supply the separated water to the water ring vacuum pump to maintain the stable operation of the water ring, and the liquid discharge pipe is used to discharge the separated waste water.

[0016] The air inlet pipe is provided with an inlet butterfly valve and a check valve. The inlet butterfly valve is used to open or close the pipeline by rotating the butterfly plate to adjust the gas flow rate, and the check valve is used to prevent the gas from flowing back in the pipeline.

[0017] The outer wall of the steam-water separator is connected to a magnetic flap level gauge for monitoring the water level in the steam-water separator; the magnetic flap level gauge is provided with a level switch for sending a signal when the water level reaches preset upper and lower limits, thereby realizing early warning protection for the unit.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The design of the duplex filter ensures that the gas is fully purified before entering the vacuum pump. The graded filtration method significantly improves the filtration efficiency, reduces the wear and corrosion of the vacuum pump caused by particulate matter and corrosive substances, and extends the service life of the vacuum pump.

[0020] The duplex filter adopts a two-stage filtering structure. The first filter at the front end is used to block larger impurities, which reduces the clogging pressure of the second filter at the rear end to a certain extent. The second filter at the rear end reduces the frequency of cleaning while ensuring normal operation. The two are connected, which greatly reduces the frequency of filter clogging and plays a role in ensuring safe production.

[0021] The slot design allows the filter to be stably fixed in the housing and will not move or deform due to the impact of airflow, thus ensuring the stability of the filtering effect. The slit design makes it very convenient to insert and remove the filter, allowing operators to easily replace or clean the filter, reducing the difficulty and time cost of maintenance work.

[0022] The filter is firmly clamped between the shell and the pressure plate by the tightening action of the pressure plate and the bolts, ensuring that the filter will not move or fall off when the gas flows and the pressure changes. At the same time, it also makes the replacement and cleaning of the filter more convenient, because you only need to loosen the bolts to take out the pressure plate and the filter together. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a structural schematic diagram of a vacuum pump unit in one embodiment of the present application;

[0025] Figure 2A cross-sectional view of a duplex filter in one embodiment of the present application;

[0026] In the figure: 1. water ring vacuum pump; 2. air inlet pipe; 3. exhaust pipe; 4. steam-water separator; 5. duplex filter; 6. housing; 7. first filter screen; 8. second filter screen; 9. first pressure plate; 10. second pressure plate; 11. differential pressure gauge; 12. first air duct; 13. second air duct; 14. electric motor; 15. elastic coupling; 16. plate heat exchanger; 17. water supply pipe; 18. drain pipe; 19. inlet butterfly valve; 20. check valve; 21. magnetic flap level gauge. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] like Figure 1 and Figure 2As shown, a chemical vacuum pump unit with duplex filtration protection comprises: a water ring vacuum pump 1, whose input end is connected to an air inlet pipe 2, and whose output end is connected to an exhaust pipe 3, for gas suction, compression and discharge; a gas-water separator 4, connected to the exhaust pipe 3, for separating gas and water; a duplex filter 5, arranged at the head end of the air inlet pipe 2, for filtering coarse particles and corrosive substances in the incoming gas; the duplex filter 5 comprises a shell 6, a first filter screen 7 and a second filter screen 8, the shell 6 is sealed and connected to the head end of the air inlet pipe 2 through a flange, the first filter screen 7 and the second filter screen 8 are fixedly arranged inside the shell 6 and perpendicular to the air flow direction, the first filter screen 7 is located in front of the second filter screen 8, and the mesh number of the second filter screen 8 is greater than the mesh number of the first filter screen 7.

[0032] Specifically, the water ring vacuum pump 1 rotates in the pump chamber through the eccentric rotor to form a volume change, thereby realizing the suction, compression and discharge of gas. During the suction process, the volume of the pump chamber increases, forming a vacuum, and sucking in external gas; during the compression process, the volume of the pump chamber decreases, and the gas is compressed and discharged; the steam-water separator connected to the exhaust pipe 3 is used to separate the discharged gas and water, and the gas continues to be discharged from the system, while the water is recovered or discharged through a specific structure; the duplex filter is set at the head end of the intake pipe 2, which is used to pre-filter the gas entering the vacuum pump. The gas first passes through the first filter 7, which has a smaller mesh number and can filter out larger coarse particles. Subsequently, the gas passes through the second filter 8 with a larger mesh number to further filter out smaller particles and corrosive substances.

[0033] The design of the duplex filter ensures that the gas is fully purified before entering the vacuum pump. The graded filtration method significantly improves the filtration efficiency, reduces the wear and corrosion of the vacuum pump caused by particulate matter and corrosive substances, and extends the service life of the vacuum pump.

[0034] The duplex filter adopts a two-stage filtering structure. The first filter screen 7 at the front end is used to block larger impurities, which reduces the clogging pressure of the second filter screen 8 at the rear end to a certain extent. The second filter screen 8 at the rear end reduces the frequency of cleaning while ensuring normal operation. The two are connected, which greatly reduces the frequency of filter clogging and plays a role in ensuring safe production.

[0035] Preferably, the mesh number of the first filter screen 7 is 10 meshes or 20 meshes, and the mesh number of the second filter screen 8 is 100 meshes.

[0036] In some embodiments, the inner wall of the housing 6 is provided with a first slot and a second slot, which are respectively used to insert and limit the peripheral edges of the first filter screen 7 and the second filter screen 8; the housing 6 is provided with a first slit and a second slit, which are respectively used to insert and remove the first filter screen 7 and the second filter screen 8. Through the slot design, the filter screen can be stably fixed in the housing and will not move or deform due to the impact of the airflow, thereby ensuring the stability of the filtering effect; the slit design makes it very convenient to insert and remove the filter screen, and the operator can easily replace or clean the filter screen, reducing the difficulty and time cost of maintenance work.

[0037] In some embodiments, a first slit is extended from the peripheral edge of the first filter screen 7 and abuts against the first pressing plate 9, which is fixed to the outer wall of the housing 6 by bolts; a second slit is extended from the peripheral edge of the second filter screen 8 and abuts against the second pressing plate 10, which is fixed to the outer wall of the housing 6 by bolts. The filter screen is firmly clamped between the housing and the pressing plate by the tightening action of the pressing plate and the bolts, ensuring that the filter screen will not move or fall off when the gas flows and the pressure changes. At the same time, it also makes it more convenient to replace and clean the filter screen, because only the bolts need to be loosened to take out the pressing plate and the filter screen together.

[0038] In some embodiments, a first sealing gasket is provided between the first filter screen 7 and the first slit; a second sealing gasket is provided between the second filter screen 8 and the second slit. When the filter screen is inserted into the corresponding slit, the sealing gasket will be compressed between the filter screen and the slit to form a sealing layer, which can prevent the gas from bypassing the filter screen and flowing out directly from the slit, ensuring that all gas must be filtered by the filter screen before entering the vacuum pump. At the same time, the sealing gasket can also play a buffering role, reducing the vibration and wear of the filter screen under the impact of airflow, thereby extending the service life of the filter screen.

[0039] In some embodiments, a differential pressure gauge 11 is provided on the outside of the housing 6, and the differential pressure gauge is connected to the first air duct 12 and the second air duct 13. The first air duct 12 is connected to the air chamber in the housing 6 located in front of the first filter screen 7, and the second air duct 13 is connected to the air chamber in the housing 6 located in the rear of the second filter screen 8. When the duplex filter is working normally, the first filter screen 7 will block most of the coarse particles, and the second filter screen 8 will further remove the corrosive substances. With the accumulation of particles on the filter screen, the filter screen will gradually be blocked, resulting in an increase in the upper and rear side air pressure difference. By observing the reading of the differential pressure gauge 11, the operator can judge the degree of blockage of the filter screen, and replace or clean the filter screen in time to ensure the continuous and effective operation of the duplex filter.

[0040] In some embodiments, the vacuum pump unit includes a motor 14, and the output shaft of the motor 14 is connected to the drive shaft of the water ring vacuum pump 1 through an elastic coupling 15. The motor 14 serves as a power source, and the elastic coupling 15 transmits the torque generated by the motor 14 to the drive shaft of the water ring vacuum pump 1, which can absorb and buffer shock and vibration, and reduce the vibration of the motor 14 and the water ring vacuum pump 1 during operation.

[0041] In some embodiments, the vacuum pump unit includes a plate heat exchanger 16, which is connected to the water ring vacuum pump 1 through a pipeline. The plate heat exchanger 16 is used to send the working water in the water ring vacuum pump 1 back to the water ring vacuum pump 1 after heat exchange, so as to cool the working water. The plate heat exchanger 16 uses its own heat exchange surface to transfer the heat in the working water to the external cooling medium, thereby achieving the cooling of the working water. The cooled working water is then sent back to the water ring vacuum pump 1 through a pipeline to continue to participate in the compression and discharge process of the gas.

[0042] In some embodiments, the steam-water separator 4 is connected to a water supply pipe 17 and a liquid discharge pipe 18. The water supply pipe 17 is used to supply the separated water to the water ring vacuum pump 1 to maintain the stable operation of the water ring, and the liquid discharge pipe 18 is used to discharge the separated waste water. The main function of the water supply pipe 17 is to supply the clean water separated from the steam-water separator 4 back to the water ring vacuum pump 1. During the operation of the water ring vacuum pump 1, part of the working water will evaporate due to the heat generated by the gas compression, resulting in a reduction in the amount of water in the water ring. The water supply of the water supply pipe 17 can ensure the stable operation of the water ring and avoid the performance degradation or damage of the equipment due to insufficient water. The liquid discharge pipe 18 is responsible for discharging the waste water separated from the steam-water separator 4 out of the system.

[0043] In some embodiments, the air inlet pipe 2 is provided with an inlet butterfly valve 19 and a check valve 20. The inlet butterfly valve 19 is used to open or close the pipeline by rotating the butterfly plate to adjust the gas flow, and the check valve 20 is used to prevent the gas from flowing back in the pipeline. When the gas flow needs to be increased, the butterfly plate can be rotated to form a certain angle with the pipeline axis to allow more gas to pass; when the gas flow needs to be reduced or the pipeline needs to be completely closed, the butterfly plate can be rotated to a position perpendicular to the pipeline axis to block the flow of gas; during the operation of the vacuum pump unit, if it suddenly stops or pressure fluctuations occur in the pipeline, it may cause gas backflow and damage the equipment. The check valve 20 can automatically sense the flow direction of the gas through its internal valve disc and spring mechanism, and quickly close when the gas attempts to flow back, thereby protecting the equipment from damage.

[0044] In some embodiments, the outer wall of the steam-water separator 4 is connected to a magnetic flap level gauge 21 for monitoring the water level in the steam-water separator 4; the magnetic flap level gauge 21 is provided with a level switch for sending a signal when the water level reaches the preset upper and lower limits, thereby realizing early warning protection for the unit. The working principle of the magnetic flap level gauge 21 is based on the principles of magnetic coupling and buoyancy. When the water level in the steam-water separator 4 changes, the float will float up and down accordingly, and drive the magnetic flap to flip through the magnetic coupling, thereby indicating the current water level; in addition, the magnetic flap level gauge 21 is also provided with a level switch. When the water level reaches the preset upper and lower limits, the level switch will send a signal to realize early warning protection for the unit.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A chemical vacuum pump unit with double filtration protection, characterized in that: include: A water ring vacuum pump (1), whose input end is connected to an air inlet pipe (2) and whose output end is connected to an exhaust pipe (3), is used for inhaling, compressing and exhausting gas; A steam-water separator (4), connected to the exhaust pipe (3), for separating gas and water; A duplex filter (5) is arranged at the head end of the air inlet pipe (2) and is used to filter coarse particles and corrosive substances in the incoming gas; The duplex filter (5) comprises a housing (6), a first filter screen (7) and a second filter screen (8); the housing (6) is sealedly connected to the head end of the intake pipe (2) via a flange; the first filter screen (7) and the second filter screen (8) are fixedly arranged inside the housing (6) perpendicular to the air flow direction; the first filter screen (7) is located in front of the second filter screen (8); and the mesh number of the second filter screen (8) is greater than the mesh number of the first filter screen (7).

2. A chemical vacuum pump unit with double filtration protection according to claim 1, characterized in that: The inner wall of the housing (6) is provided with a first slot and a second slot, which are respectively used to insert and limit the peripheral edges of the first filter screen (7) and the second filter screen (8); The housing (6) is provided with a first slit and a second slit, which are used for inserting and removing the first filter screen (7) and the second filter screen (8), respectively.

3. A chemical vacuum pump unit with double filtration protection according to claim 2, characterized in that: The peripheral edge of the first filter screen (7) extends out of the first slit and abuts against the first pressing plate (9), and the first pressing plate (9) is fixed to the outer wall of the shell (6) by bolts; The peripheral edge of the second filter screen (8) extends out of the second slit and abuts against the second pressing plate (10); the second pressing plate (10) is fixed to the outer wall of the shell (6) by bolts.

4. A chemical vacuum pump unit with double filtration protection according to claim 3, characterized in that: A first sealing gasket is provided between the first filter screen (7) and the first slit; and a second sealing gasket is provided between the second filter screen (8) and the second slit.

5. A chemical vacuum pump unit with double filtration protection according to claim 1, characterized in that: A differential pressure gauge (11) is provided outside the shell (6), the differential pressure gauge (11) being connected to a first air duct (12) and a second air duct (13), the first air duct (12) being connected to an air chamber located in front of the first filter screen (7) in the shell (6), and the second air duct (13) being connected to an air chamber located in rear of the second filter screen (8) in the shell (6).

6. A chemical vacuum pump unit with double filtration protection according to claim 1, characterized in that: It comprises an electric motor (14), the output shaft of the electric motor (14) being connected to the driving shaft of the water ring vacuum pump (1) via an elastic coupling (15).

7. A chemical vacuum pump unit with double filtration protection according to claim 1, characterized in that: It comprises a plate heat exchanger (16), which is connected to the water ring vacuum pump (1) through a pipeline and is used to send the working water in the water ring vacuum pump (1) back after heat exchange, so as to cool the working water.

8. A chemical vacuum pump unit with double filtration protection according to claim 1, characterized in that: The steam-water separator (4) is connected to a water supply pipe (17) and a liquid discharge pipe (18). The water supply pipe (17) is used to replenish the separated water into the water ring vacuum pump (1) to maintain the stable operation of the water ring, and the liquid discharge pipe (18) is used to discharge the separated waste water.

9. A chemical vacuum pump unit with double filtration protection according to claim 1, characterized in that: The air inlet pipe (2) is provided with an inlet butterfly valve (19) and a check valve (20). The inlet butterfly valve (19) is used to open or close the pipeline by rotating the butterfly plate to adjust the gas flow rate, and the check valve (20) is used to prevent the gas from flowing back in the pipeline.

10. A chemical vacuum pump unit with double filtration protection according to claim 1, characterized in that: The outer wall of the steam-water separator (4) is connected to a magnetic flap level gauge (21) for monitoring the water level in the steam-water separator (4); The magnetic flap liquid level gauge (21) is provided with a liquid level switch, which is used to send out a signal when the water level reaches preset upper and lower limits, thereby realizing early warning protection for the unit.

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