CN218093643U - Inlet filtering device of centrifugal pump - Google Patents

Abstract

The application discloses an inlet filtering device of a centrifugal pump, which comprises a horizontal pipe and a vertical pipe connected to the upper side of the horizontal pipe, wherein a blind flange is installed at a sewage discharge end of the horizontal pipe, a filter cylinder is movably arranged in the horizontal pipe, one end of the filter cylinder, which faces the sewage discharge end, is provided with an end plate, one end of the filter cylinder, which deviates from the sewage discharge end, is in an open shape, and the outer wall of the filter cylinder is abutted against the inner wall of the horizontal pipe; a guide plate and a dirt blocking piece are arranged in the filter cylinder, and the guide plate is positioned on one side of the dirt blocking piece, which is far away from the sewage discharge end; one end of the guide plate is fixed at the top of the filter cylinder, the other end of the guide plate extends towards the sewage discharge end along the downward inclined direction, a distance is reserved between the lower end of the guide plate and the inner wall of the filter cylinder, the sewage blocking part comprises a vertical plate, a horizontal plate and a hook plate which are connected in sequence, and a blocking hole is formed in the vertical plate; a vortex channel is formed between the trash blocking piece and the filter cylinder. Utilize this application, can reduce the solid particle to the jam of cartridge filter, the increase of service cycle reduces the cleaning frequency, reduces corresponding waste water and greasy dirt volume from this.

Description

Inlet filtering device of centrifugal pump

Technical Field

The utility model relates to an entry filter equipment of centrifugal pump.

Background

Petrochemical industry is equipped with a large amount of centrifugal pumps, in the pump that enters into that avoids liquid to carry, damages the impeller, and impurity gets into next process, can set up the filter at the entry of centrifugal pump, for avoiding producing great resistance, generally chooses the basket filter of filter screen structure for use, and liquid is when flowing through the filter, and the solid particle that increases is intercepted in the filter screen, has realized simple solid-liquid separation. The basket filter has the advantages of simple and reliable structure, but in the operation process, a large amount of solid particles can be blocked in the area of the filter screen, which is just opposite to the outlet of the filter, under the driving of liquid, the resistance of the liquid is gradually increased along with the gradual increase of the solid particles, the flow rate is reduced, although a large amount of space still exists in the filter and can contain the solid particles, the filter still needs to be stopped and cleaned, the phenomenon not only increases the stop frequency of the centrifugal pump, but also can be cleaned according to different liquids in the conventional production process. The filters generally need to be cleaned every 20-40 days, and a certain amount of waste water and oil stains are generated during cleaning of the filters each time, so that the workload of waste treatment is increased.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides an inlet filter device of a centrifugal pump, which comprises a horizontal pipe extending along the horizontal direction and a vertical pipe connected to the upper side of the horizontal pipe, wherein the two ends of the horizontal pipe are respectively formed into a liquid inlet end and a sewage discharge end, a blind flange is detachably arranged at the sewage discharge end, a cylindrical filter cartridge is movably arranged in the horizontal pipe, one end of the filter cartridge, which faces the sewage discharge end, is provided with an end plate, the filter cartridge is formed by rolling a filter screen, the filter cartridge extends along the horizontal direction, one end of the filter cartridge, which is far away from the sewage discharge end, is in an open shape, and the outer wall of the filter cartridge is abutted against the inner wall of the horizontal pipe; a guide plate and a dirt blocking piece are fixedly arranged in the filter cylinder, the guide plate and the dirt blocking piece are arranged at intervals along the horizontal direction, and the guide plate is positioned on one side of the dirt blocking piece, which is far away from the sewage discharge end;

one end of the guide plate is fixed at the top of the filter cylinder, the other end of the guide plate extends towards the direction of the sewage discharge end along the downward inclined direction, a distance is reserved between the lower end of the guide plate and the inner wall of the filter cylinder, and in the horizontal direction, the connection point of the guide plate and the filter cylinder is positioned on one side of the vertical pipe facing the liquid inlet end; the trash blocking piece is L-shaped and comprises a vertical plate, a horizontal plate and a hook plate which are sequentially connected, wherein the vertical plate extends along the vertical direction, the upper end of the vertical plate is connected to the filter cylinder, one end of the horizontal plate is connected to the lower end of the vertical plate, the other end of the horizontal plate extends towards the direction of the sewage discharge end, the hook plate is connected to one end of the horizontal plate towards the sewage discharge end and extends upwards, and a space surrounded by the vertical plate, the horizontal plate and the hook plate forms an impurity cavity; the vertical plate is provided with a through hole-shaped interception hole, and the horizontal plate and the hook plate are not provided with a pore channel; form liquid inlet channel between the lower part of horizontal plate and cartridge filter, collude and form the tip passageway between board and the end plate, collude and have between the top of board and the cartridge filter and overflow the passageway, liquid inlet channel, tip passageway and overflow the passageway and form vortex channel jointly.

When the vertical type impurity removing device operates, liquid enters the horizontal pipe and flows from the liquid inlet end to the sewage discharging end, after the liquid enters the filter cylinder, the liquid continues to flow forwards through a space between the guide plate and the bottom of the filter cylinder under the limitation of the guide plate and then enters the vortex channel, the liquid enters the impurity cavity along the vortex channel under the limitation of the horizontal pipe and the end plate, solid particles carried in the liquid are retained in the impurity cavity under the interception of the vertical plate, and the liquid passes through the interception hole, then enters the vertical pipe through the filter cylinder and then is conveyed to a next process through the centrifugal pump.

When the liquid passes through the space between the guide plate and the trash rack, part of the liquid directly flows upwards through the space between the guide plate and the trash rack, so that part of solid particles with larger particle sizes are intercepted in the area of the filter cylinder opposite to the vertical pipe, but the total amount of the solid particles is greatly reduced.

When the fluid resistance in the pipeline is increased to a set value, the blind flange is disassembled, the filter cylinder is drawn out from the horizontal pipe, and is cleaned and restored for use. Because most solid particles can enter the impurity cavity, the blockage of the filter cartridge by the solid particles is reduced, the service cycle of the filter cartridge is prolonged, and the cleaning frequency of the filter is reduced, so that the shutdown frequency of the centrifugal pump is reduced, the amount of wastewater and oil dirt generated by cleaning the filter is reduced, and the corresponding workload of waste treatment is reduced. Through tests, the cleaning time of the filter can be prolonged by 2-3 times by adopting the embodiment to replace the existing basket filter.

Furthermore, the guide plate is provided with a through hole-shaped filtering hole. This design can guarantee the excessive flow of cartridge filter, reduces because the setting of guide plate, and the pipeline resistance increase condition that leads to.

Further, in the horizontal direction, one end of the deflector, which faces the sewage discharge end, is located in the middle of the vertical pipe. When liquid flows through the guide plate, part of the liquid flows upwards from the space between the guide plate and the trash blocking part and enters the vertical pipe after passing through the filter cylinder, and due to the inertia effect, most of solid particle flow intercepted by the guide plate continuously flows backwards along with the liquid through the space between the trash blocking part and the filter cylinder, and then forms vortex under the obstruction of the end plate, so that the solid particles enter the impurity cavity.

Further, in order to ensure the flow area of the fluid and reduce the flow resistance, the trash blocking piece is positioned on one side of the vertical pipe facing the sewage discharge end in the horizontal direction. The design can avoid the obstruction of the trash blocking piece to the inlet of the opposite pipe, and the pipe top of the horizontal pipe has the effect of obstructing water flow, so that liquid entering the trash blocking piece area can form stable vortex, and solid particles can smoothly enter the impurity cavity.

Further, in order to improve the proportion of solid particles entering the impurity cavity, the distance between the trash blocking piece and the bottom of the filter cylinder is 40-50% of the inner diameter of the filter cylinder.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed Description

Referring to fig. 1, an inlet filter of a centrifugal pump includes a horizontal pipe 11 extending in a horizontal direction and a vertical pipe 12 connected to an upper side of the horizontal pipe, both ends of the horizontal pipe 11 are respectively formed as a liquid inlet end 111 and a drain end 112, a pipe flange 14 is welded to the drain end, and a blind flange 15 is detachably mounted on the pipe flange 14 by bolts, that is, a blind flange is detachably mounted at the drain end. The area between the blowdown end of the horizontal pipe to the riser is referred to as the trash section 13. At the top end of the stand pipe is welded a connection flange 122 for connection to the inlet of the centrifugal pump.

A cylindrical filter cartridge 40 is movably arranged in the horizontal pipe, the filter cartridge comprises a filter cartridge body 41 extending along the horizontal direction and an end cover 42 arranged at one end of the filter cartridge body facing the sewage discharge end, and one end of the filter cartridge departing from the sewage discharge end is in an open shape. The outer wall of the filter cartridge abuts against the inner wall of the horizontal pipe. Particularly, in this embodiment, the filtering cylinder is made of steel filtering net by rolling.

A guide plate 22 and a trash rack 21 are fixedly arranged in the filter cylinder, the guide plate 22 and the trash rack 21 are arranged at intervals along the horizontal direction, and the guide plate 22 is positioned on one side of the trash rack 21, which is far away from the sewage discharge end 112.

This guide plate 22's one end is fixed at the top of cartridge filter 40, and the other end of guide plate extends towards blowdown end direction along the direction of downward sloping, has the distance between the lower extreme of guide plate and the inner wall of cartridge filter, and on the horizontal direction, the tie point of guide plate and cartridge filter is located the riser towards the one side of feed liquor end. The guide plate is provided with a through hole-shaped filtering hole 221, and in the embodiment, the guide plate is made of a stainless steel pore plate. In the horizontal direction, the end of the baffle 22 toward the blowdown end 112 is located in the middle of the riser.

This trash rack 21 is L shape, and trash rack is including riser 212, horizontal plate 213 and the board 214 that colludes that connects in order, and wherein riser 212 extends along vertical direction, and its upper end is connected on the cartridge filter, and the lower extreme at the riser is connected to the one end of horizontal plate, and the other end of horizontal plate extends towards the direction of blowdown end, colludes the board and connects on the one end of horizontal plate orientation blowdown end and upwards extend, and the space that is enclosed by riser, horizontal plate and colluding the board forms impurity chamber 216. The vertical plate is provided with a through hole-shaped interception hole 211, and the horizontal plate and the hook plate are not provided with a pore channel. Specifically, in this embodiment, the vertical plate is made of a stainless steel orifice plate.

Form liquid inlet channel between the lower part of horizontal plate and cartridge filter, collude and form the tip passageway between board and the end plate, collude and have the passageway that overflows between the top of board and the cartridge filter, liquid inlet channel, tip passageway and overflow the passageway and form vortex channel 215 jointly.

The trash rack is located in the area of the trash rack section 13, i.e. in the horizontal direction, on the side of the riser towards the discharge end. Riser 212 is located directly below the wall of the riser on the side toward the blowdown end.

The distance H is arranged between the lower end of the dirt blocking part and the inner wall of the filter cylinder, in the embodiment, the distance H is 30% of the inner diameter of the filter cylinder, and the lower end of the guide plate is equal to the lower end of the dirt blocking part in height.

When the embodiment operates, liquid enters the horizontal pipe and flows from the liquid inlet end to the sewage discharging end, after the liquid enters the filter cylinder, part of the liquid continues to flow forwards through a space between the guide plate and the bottom of the filter cylinder under the limitation of the guide plate and then enters the vortex channel 215, the liquid enters the impurity cavity along the vortex channel under the limitation of the horizontal pipe and the end plate, solid particles 31 carried in the liquid are retained in the impurity cavity 216 under the interception of the vertical plate, and the liquid passes through the interception hole, then enters the vertical pipe through the filter cylinder and then is conveyed to a next process through the centrifugal pump.

When liquid passes through the guide plate, part of the liquid can pass through the guide holes on the guide plate and then enters the vertical pipe through the filter cartridge, but solid particles with larger particle sizes carried in the liquid can enter the liquid inlet channel under the interception of the guide plate and the driving of the liquid, then flow along the vortex channel and finally enter the impurity cavity. When the liquid passes through the space between the guide plate and the trash rack, part of the liquid directly flows upwards through the space between the guide plate and the trash rack, so that part of solid particles with larger particle sizes are still intercepted in the area of the filter cylinder opposite to the vertical pipe, but the total amount of the solid particles is greatly reduced.

When the fluid resistance in the pipe increases to a set value, the blind flange 15 is removed, the filter cartridge 40 is drawn out of the horizontal pipe, cleaned, and restored to use. Because most solid particles can enter the impurity cavity, the blockage of the filter cartridge by the solid particles is reduced, the service cycle of the filter cartridge is prolonged, and the cleaning frequency of the filter is reduced, so that the shutdown frequency of the centrifugal pump is reduced, the wastewater and oil stains generated by cleaning the filter are reduced, and the corresponding workload of waste treatment is reduced. Tests show that the cleaning time of the filter can be prolonged from 35 days to 92-110 days by adopting the embodiment to replace the existing basket filter.

Claims (5)

1. An inlet filtering device of a centrifugal pump is characterized by comprising a horizontal pipe extending along the horizontal direction and a vertical pipe connected to the upper side of the horizontal pipe, wherein two ends of the horizontal pipe are respectively formed into a liquid inlet end and a sewage discharge end, a blind flange is detachably arranged at the sewage discharge end, a cylindrical filter cartridge is movably arranged in the horizontal pipe, an end plate is arranged at one end, facing the sewage discharge end, of the filter cartridge, the filter cartridge is formed by rolling a filter screen, the filter cartridge extends along the horizontal direction, one end, facing away from the sewage discharge end, of the filter cartridge is in an open shape, and the outer wall of the filter cartridge abuts against the inner wall of the horizontal pipe; a guide plate and a dirt blocking piece are fixedly arranged in the filter cylinder, the guide plate and the dirt blocking piece are arranged at intervals along the horizontal direction, and the guide plate is positioned on one side of the dirt blocking piece, which is far away from the sewage discharge end;

one end of the guide plate is fixed at the top of the filter cylinder, the other end of the guide plate extends towards the direction of the sewage discharge end along the downward inclined direction, a distance is reserved between the lower end of the guide plate and the inner wall of the filter cylinder, and in the horizontal direction, the connection point of the guide plate and the filter cylinder is positioned on one side of the vertical pipe facing the liquid inlet end; the trash blocking piece is L-shaped and comprises a vertical plate, a horizontal plate and a hook plate which are connected in sequence, wherein the vertical plate extends along the vertical direction, the upper end of the vertical plate is connected to the filter cylinder, one end of the horizontal plate is connected to the lower end of the vertical plate, the other end of the horizontal plate extends towards the direction of the sewage discharge end, the hook plate is connected to one end of the horizontal plate towards the sewage discharge end and extends upwards, and a space surrounded by the vertical plate, the horizontal plate and the hook plate forms an impurity cavity; the vertical plate is provided with through hole-shaped interception holes, and the horizontal plate and the hook plate are not provided with pore channels; form liquid inlet channel between the lower part of horizontal plate and cartridge filter, collude and form the tip passageway between board and the end plate, collude and have between the top of board and the cartridge filter and overflow the passageway, liquid inlet channel, tip passageway and overflow the passageway and form vortex channel jointly.

2. The inlet filter assembly of a centrifugal pump as recited in claim 1, wherein the baffle has filter holes in the form of through holes.

3. The inlet filter assembly of a centrifugal pump according to claim 1, wherein an end of the baffle plate facing the dirt discharge end is located at a middle portion of the stand pipe in a horizontal direction.

4. An inlet filter arrangement for a centrifugal pump according to claim 1, wherein the dirt barrier is located on the side of the stand pipe facing the dirt discharge end in the horizontal direction.

5. An inlet filter arrangement for a centrifugal pump according to claim 1, wherein the distance between the dirt stop and the bottom of the filter cartridge is 40-50% of the internal diameter of the filter cartridge.

Images