CN216855839U - Negative pressure self-suction backwashing device - Google Patents

Abstract

A negative pressure self-absorption backwashing device comprises a filter main body shell, a primary filter cavity, a secondary filter cavity, a backwashing device and a controller, wherein the primary filter cavity and the secondary filter cavity are arranged inside the filter main body shell, a partition plate with a hole is arranged between the primary filter cavity and the secondary filter cavity; the submersible pump, the water inlet pressure sensor and the water outlet pressure sensor are all connected with the controller. The utility model adopts the submersible pump to pump and discharge so as to generate negative pressure in the filter main body and realize the back washing function of the filter of the low-pressure drip irrigation system.

Description

Negative pressure self-suction backwashing device

Technical Field

The utility model relates to a backwashing device, in particular to a negative pressure self-suction backwashing device.

Background

With the development of agriculture, the drip irrigation mode in water-saving irrigation is widely applied, and the requirement on the quality of irrigation water is particularly strict in order to meet the normal operation of a drip irrigation system. Filters have become an indispensable device in irrigation.

At present, the primary filtration of irrigation water in a micro-irrigation system is mainly completed by adopting a screen filter. When the traditional net type filter works, water containing dirt enters the filter through the filter screen from the water inlet, the dirt is intercepted on the filter screen, and the filtered water is discharged from the water outlet. The working pressure of the prior automatic back-flushing net type filter is 30 meters (0.3 MPa), the back-flushing pressure is required to be 20-25 meters (0.2-0.25 MPa), the dirt filtered on a filter screen is flushed cleanly by a blowdown electromagnetic valve by utilizing the difference between atmospheric pressure and tail working pressure, the pressure difference is generally more than 10-15 meters (0.1-0.15 MPa) and is not flushed cleanly by the pressure difference lower than 10 meters (0.1 MPa). Therefore, in order to meet the requirement of automatic back flushing, the head working pressure of the drip irrigation system is 25-30 meters (0.25-0.3 MPa). At present, due to the low carbon and insufficient power supply of a power grid, the water outlet pressure of a water pump at the head part of the drip irrigation is reduced under the condition of low voltage of a regional power grid or underground water level reduction and the like, and when the working pressure is reduced to 15-20 meters (0.15-0.2 MPa), the automatic back flushing function effect is limited or even cannot be realized. Dirt clogging the filter affects drip irrigation system irrigation uniformity and use.

SUMMERY OF THE UTILITY MODEL

The utility model provides a negative pressure self-absorption backwashing device for overcoming the defects of the prior art, which adopts a submersible pump to pump and discharge so as to generate negative pressure in a filter main body and realize the backwashing function of a filter of a low-pressure drip irrigation system.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

a negative pressure is from inhaling back flush device, the device includes filter main body shell, elementary filter chamber, second grade filter chamber, back flush device and controller, filter main body shell both ends shutoff sets up, elementary filter chamber and second grade filter chamber all set up inside the filter main body shell, are provided with foraminiferous baffle between the two, and the coarse strainer sets up in elementary filter chamber, and thin filter screen sets up in the second grade filter chamber, coarse strainer and thin filter screen all with the inner wall of filter main body shell has certain clearance, back flush device includes back flush soil pick-up device and airtight evacuating device, airtight evacuating device includes back flush driving chamber, back flush sewage pipe, sewage seal box, immersible pump and blow off pipe, back flush driving chamber sets up inside the filter main body shell, with separate through the baffle between the second grade filter chamber, the partition plate with the hole and the partition plate are both in sealing connection with the inner wall of the filter main body shell, the backwashing driving chamber is communicated with the sewage sealing box through the backwashing sewage pumping pipe, the submersible pump is arranged in the sewage sealing box, the sewage discharging pipe is connected with a sewage discharging port of the submersible pump, and the backwashing sewage suction device is arranged in the filter main body shell; the primary filter cavity is provided with a water inlet and a water inlet pressure sensor on the outer wall, the secondary filter cavity is provided with a water outlet and a water outlet pressure sensor on the outer wall, and the submersible pump, the water inlet pressure sensor and the water outlet pressure sensor are all connected with the controller.

The negative pressure self-absorption backwashing device comprises a sewage suction rotating shaft, a sewage suction nozzle, a rotary injection pipe and a reciprocating screw rod, wherein the sewage suction rotating shaft is a hollow pipe with two blocked ends, one end of the sewage suction rotating shaft penetrates through the center of the perforated partition plate, the other end of the sewage suction rotating shaft penetrates through the centers of the partition plate and the side wall of one end of the filter main body shell and is connected with the reciprocating screw rod, the sewage suction rotating shaft is respectively connected with the perforated partition plate, the partition plate and one end of the filter main body shell by adopting a linear bearing, the sewage suction rotating shaft and the linear bearing are sealed by adopting a sealing gasket, a driving fixing chamber is arranged outside the end part of the backwashing driving chamber, the reciprocating screw rod is arranged in the driving fixing chamber, a guide plate is fixed on the inner upper wall of the driving fixing chamber close to one end of the filter main body shell, one end of the guide plate slides along the screw port of the reciprocating screw rod, the rotary jet pipe is symmetrically and vertically arranged with the sewage suction rotating shaft, water spray nozzles with opposite outlet water directions are arranged at two ends of the rotary jet pipe, the sewage suction nozzles are axially and circumferentially arranged and are uniformly arranged at intervals on the sewage suction rotating shaft in the secondary filter cavity, and one end of the sewage suction nozzle is close to the fine filter screen.

According to the negative pressure self-absorption backwashing device, the water spray nozzles are arranged in an inverted horn shape, the two water spray nozzles are respectively connected with the two ends of the rotary injection pipe at 90 degrees, and the diameter of the connecting end of the water spray nozzles and the rotary injection pipe is larger than that of the water outlet end.

According to the negative pressure self-suction backwashing device, the end, close to the fine filter screen, of the sewage suction nozzle is arranged to be in an arc shape, and the arc shape is consistent with the arc shape of the fine filter screen.

According to the negative pressure self-absorption backwashing device, the sewage sealing box is of a fully-closed structure, and the top of the sewage sealing box is provided with the detachable sealing cover plate.

In the negative pressure self-priming backwashing device, the reciprocating screw is provided with threads in a crossed manner, and two ends of a screw port between two crossed threads are respectively communicated.

According to the negative pressure self-absorption backwashing device, the discharge pipe is provided with the electromagnetic valve, and the electromagnetic valve is connected with the controller.

According to the negative pressure self-priming backwashing device, the main shell of the filter is cylindrical.

The utility model has the beneficial effects that:

the back washing device of the utility model utilizes the sewage seal box and the submersible pump to vacuumize the interior of the filter main body shell, so that a negative pressure state lower than the atmospheric pressure is formed in the interior of the filter main body shell, the back washing pressure difference is increased, and the automatic back washing can be realized under the working pressure of 10-20 meters (0.10-0.2 MPa) at low pressure. During back flushing, water power is used as power, water spray nozzles at two ends of the rotary injection pipe are reversely arranged, the sewage suction rotating shaft is driven to rotate in the circumferential direction under the action of reverse water spray force, and simultaneously, the sewage suction rotating shaft moves in the left-right axial direction under the action of the reciprocating screw rod and the guide vane, so that the back flushing process is stable in operation, the flushing effect is uniform, the all-directional sewage suction of the fine filter screen is realized, external force driving is not needed in the sewage suction process, and the energy is saved. The water nozzle is arranged in an inverted horn shape, so that when water is sprayed out from the water nozzle, the flow speed is increased, the provided reaction force is increased, and the rotary motion of the backwashing assembly is more stable.

Drawings

FIG. 1 is a schematic structural view of a negative pressure self-priming backwashing device according to the present invention;

FIG. 2 is a schematic structural view of a sealed vacuum-pumping apparatus;

FIG. 3 is a schematic view of a rotary jet tube configuration;

fig. 4 is a schematic view of a reciprocating screw structure.

In the figure: 1. a filter body housing; 2. a primary filtration chamber; 3. a secondary filter chamber; 4. a controller; 5. a perforated partition plate; 6. coarse filtration; 7. a fine filter screen; 8. a backwash driving chamber; 9. backwashing the sewage pumping pipe; 10. a sewage seal box; 10-1, sealing a cover plate; 11. a submersible pump; 12. a blow-off pipe; 13. a partition plate; 14. a water inlet; 15. a water inlet pressure sensor; 16. a water outlet; 17. a water outlet pressure sensor; 18. a dirt suction rotating shaft; 19. a sewage suction nozzle; 20. rotating the injection pipe; 20-1, water spray nozzles; 21. a reciprocating screw; 22. a drive fixing chamber; 23. a guide plate; 24. an electromagnetic valve.

Detailed Description

The utility model will be further explained with reference to the drawings.

Referring to fig. 1 and 4, the utility model relates to a negative pressure self-priming back flushing device, which comprises a filter main body shell 1, a primary filter cavity 2, a secondary filter cavity 3, a back flushing device and a controller 4, wherein the filter main body shell 1 is arranged into a cylindrical barrel shape with two blocked ends, the primary filter cavity 2 and the secondary filter cavity 3 are both arranged inside the filter main body shell 1, a partition plate 5 with holes is arranged between the primary filter cavity 2 and the secondary filter cavity 3, a coarse filter screen 6 is arranged inside the primary filter cavity 2, a fine filter screen 7 is arranged inside the secondary filter cavity 3, a certain gap is formed between the coarse filter screen and the fine filter screen and the inner wall of the filter main body shell, the back flushing device comprises a back flushing dirt suction device and a closed vacuum pumping device, the back flushing dirt suction device is arranged inside the filter main body shell 1 and comprises a dirt suction rotating shaft 18, a dirt suction nozzle 19, a rotating injection pipe 20 and a reciprocating screw 21, the sewage suction rotating shaft 18 is a hollow pipe with two blocked ends, one end of the sewage suction rotating shaft penetrates through the central position of the perforated partition plate 5, the other end of the sewage suction rotating shaft penetrates through the centers of the partition plate 13 and the side wall of one end of the filter main body shell 1 and is connected with the reciprocating screw rod 21, the sewage suction rotating shaft 18 is respectively connected with the perforated partition plate 5, the partition plate 13 and one end of the filter main body shell 1 through linear bearings, and a sealing gasket is adopted between the sewage suction rotating shaft 18 and the linear bearings for sealing, so that the sewage suction rotating shaft can rotate circumferentially and can slide axially and is sealed tightly. The sewage suction rotating shaft can rotate circumferentially and move axially when working, so as to realize the all-dimensional suction of sewage which is backwashed by a fine filter screen, a driving fixed chamber 22 is arranged at the outer side of the end part of the backwashing driving chamber 8, the reciprocating screw 21 is arranged in the driving fixed chamber 22, a guide plate 23 is fixed on the upper wall of the inside of one end of the driving fixed chamber 22 close to the filter main body shell 1, one end of the guide plate 23 slides along the screw mouth of the reciprocating screw 21, the sewage suction rotating shaft 18 which is arranged in the backwashing driving chamber 8 is communicated with the rotary injection pipe 20, the rotary injection pipe 20 is symmetrically and vertically communicated with the sewage suction rotating shaft 18, water nozzles 20-1 with opposite outlet water directions are arranged at the two ends of the rotary injection pipe 20, and the sewage suction rotating shaft rotates axially under the action of reverse water spraying force, drive reciprocal screw rod circumferential direction simultaneously, under the guide vane direction, reciprocal screw rod carries out axial displacement simultaneously, realizes the 18 axial reciprocating motion of soil pick-up rotation axis, soil pick-up mouth 19 is being located along axial and circumference, the even intercommunication setting in interval on the soil pick-up rotation axis 18 of second grade filter chamber 3 inside, soil pick-up mouth 19 one end is close fine filter screen 7, and sets up to the shape unanimous with fine filter screen arc, does benefit to the soil pick-up mouth and presses close to fine filter screen and rotates, absorbs the filth that fine filter screen backwash got off.

Referring to fig. 1 and 2, the closed vacuum pumping device comprises a backwashing drive chamber 8, a backwashing sewage pumping pipe 9, a sewage seal box 10, a submersible pump 11 and a sewage discharge pipe 12, wherein the backwashing drive chamber 8 is arranged inside the filter main body shell 1 and is separated from the secondary filter chamber 3 by a partition plate 13, the partition plate 5 with holes and the partition plate 13 are both connected with the inner wall of the filter main body shell 1 in a sealing way, so that the primary filter chamber, the secondary filter chamber and the backwashing drive chamber are independent sealed chambers, the backwashing drive chamber 8 is communicated with the sewage seal box 10 by the backwashing sewage pumping pipe 9, the submersible pump 11 is arranged inside the sewage seal box 10, the sewage discharge pipe 12 is connected with a sewage discharge outlet of the submersible pump 11, a water inlet 14 and a water inlet pressure sensor 15 are arranged on the outer wall of the primary filter chamber 2, a water outlet 16 and a water outlet pressure sensor 17 are arranged on the outer wall of the secondary filter chamber 3, the submersible pump 11, the water inlet pressure sensor 15 and the water outlet pressure sensor 17 are all connected with the controller 4, the electromagnetic valve 24 is arranged on the sewage discharge pipe 12, the sewage seal box 10) is of a fully-closed structure, the detachable seal cover plate 10-1 is arranged at the top, and the submersible pump is convenient to install.

Referring to fig. 3, the water nozzle 20-1 is configured as an inverted trumpet, two water nozzles 20-1 are respectively connected to two ends of the rotating injection pipe 20 at 90 degrees, and the diameter of the connection end of the water nozzle 20-1 and the rotating injection pipe 20 is larger than that of the water outlet end.

The working process is as follows: irrigation water enters the filter main body shell from the water inlet, is filtered by the coarse filter screen to enter the primary filter cavity, then enters the secondary filter cavity from the limber holes in the partition plate with holes, and is filtered by the fine filter screen, and then clear water flows out from the water outlet to carry out agricultural irrigation. When the pressure difference between the water inlet pressure sensor 15 and the water outlet pressure sensor 17 reaches a set value, it is indicated that more dirt is accumulated on the inner side of the fine filter screen, at this time, the back flushing process is performed, the controller 4 controls the submersible pump 11 and the electromagnetic valve 24 to be opened in a linkage manner, the submersible pump pumps the sewage in the sewage sealing box 10, so that the pressure in the sewage suction rotating shaft 18 is lower than the external atmospheric pressure, negative pressure is generated, the sewage suction nozzle 19 generates sewage suction force on the inner side of the fine filter screen, clean water on the outer side of the fine filter screen flows reversely, the dirt attached to the inner side of the fine filter screen is back flushed, the flushed dirt enters the sewage suction rotating shaft 18 through the sewage suction nozzle 19, and is ejected by the two water nozzles 20-1 on the rotary ejection pipe 20, the reverse acting force generated by the ejected water drives the sewage suction rotating shaft 18, the sewage suction nozzle 19 and the reciprocating screw 21 to circumferentially rotate, and the dirt on the inner side of the fine filter screen 7 is flushed and sucked circumferentially, meanwhile, the reciprocating screw 21 rotates in the circumferential direction, one end of the guide vane 23 is fixed, and the other end of the guide vane slides along the screw port, so that the reciprocating screw 21 moves in the axial direction in a reciprocating manner, the axial backwashing and absorbing process of the fine filter screen 7 is realized, and sewage generated after backwashing is discharged from the sewage discharge port. In the back flushing process, the circumferential and reciprocating axial movement of the sewage suction nozzle 19 covers the whole inner side of the fine filter screen 7, so that the back flushing effect is optimal. When the backwashing time reaches the set time of the controller 4, the controller 4 closes the submersible pump 11 and the electromagnetic valve 24, the device recovers to the normal filtering operation state, and the controller continuously monitors the pressure difference value of the water pressure of the inlet water and the water pressure of the outlet water. In the back washing process, the flow of washing water is small, and the filtering process of the device is not influenced, so that the device can continuously supply water.

Claims (8)

1. A negative pressure self-suction back flushing device is characterized in that: the device comprises a filter main body shell (1), a primary filter cavity (2), a secondary filter cavity (3), a backwashing device and a controller (4), wherein the two ends of the filter main body shell (1) are plugged, the primary filter cavity (2) and the secondary filter cavity (3) are both arranged inside the filter main body shell (1), a perforated partition plate (5) is arranged between the primary filter cavity and the secondary filter cavity, a coarse filter screen (6) is arranged in the primary filter cavity (2), a fine filter screen (7) is arranged in the secondary filter cavity (3), the coarse filter screen and the fine filter screen both have a certain gap with the inner wall of the filter main body shell, the backwashing device comprises a backwashing sewage suction device and an airtight vacuumizing device, the airtight vacuumizing device comprises a backwashing driving chamber (8), a backwashing sewage suction pipe (9), a sewage sealing box (10), a submersible pump (11) and a sewage discharge pipe (12), the backwashing driving chamber (8) is arranged in the filter main body shell (1) and is separated from the secondary filter cavity (3) through a partition plate (13), the partition plate (5) with holes and the partition plate (13) are both in sealing connection with the inner wall of the filter main body shell (1), the backwashing driving chamber (8) is communicated with a sewage sealing box (10) through a backwashing sewage pumping pipe (9), the submersible pump (11) is arranged in the sewage sealing box (10), the sewage discharging pipe (12) is connected with a sewage discharging port of the submersible pump (11), and the backwashing sewage suction device is arranged in the filter main body shell (1); the water inlet (14) and the water inlet pressure sensor (15) are arranged on the outer wall of the primary filter cavity (2), the water outlet (16) and the water outlet pressure sensor (17) are arranged on the outer wall of the secondary filter cavity (3), and the submersible pump (11), the water inlet pressure sensor (15) and the water outlet pressure sensor (17) are all connected with the controller (4).

2. The negative pressure self-priming back flush device of claim 1, wherein: the back flush sewage suction device comprises a sewage suction rotating shaft (18), a sewage suction nozzle (19), a rotary injection pipe (20) and a reciprocating screw rod (21), wherein the sewage suction rotating shaft (18) is provided with a hollow pipe with two blocked ends, one end of the hollow pipe penetrates through the center of the perforated partition plate (5), the other end of the hollow pipe penetrates through the center of the partition plate (13) and the center of the side wall of one end of the filter main body shell (1) and is connected with the reciprocating screw rod (21), the sewage suction rotating shaft (18) is respectively connected with the perforated partition plate (5), the partition plate (13) and one end of the filter main body shell (1) through linear bearings, a sealing gasket is adopted between the sewage suction rotating shaft (18) and the linear bearings for sealing, a driving fixing chamber (22) is arranged on the outer side of the end part of the back flush driving chamber (8), and the reciprocating screw rod (21) is arranged in the driving fixing chamber (22), the sewage suction device is characterized in that a guide vane (23) is fixed on the inner upper wall of one end, close to the filter main body shell (1), of the drive fixing chamber (22), one end of the guide vane (23) slides along a screw hole of the reciprocating screw rod (21), the sewage suction rotating shaft (18) in the back washing drive chamber (8) is provided with the rotary injection pipe (20) in a communicated manner, the rotary injection pipe (20) is symmetrically and vertically communicated with the sewage suction rotating shaft (18), two ends of the rotary injection pipe (20) are provided with water nozzles (20-1) with opposite outlet water directions, the sewage suction nozzles (19) are communicated with the sewage suction rotating shaft (18) in the secondary filter cavity (3) in an axial direction and a circumferential direction at uniform intervals, and one end of the sewage suction nozzle (19) is close to the fine filter screen (7).

3. The negative pressure self-priming backwash device as claimed in claim 2, wherein: the water spray nozzles (20-1) are arranged in an inverted horn shape, the two water spray nozzles (20-1) are respectively connected with the two ends of the rotary injection pipe (20) at 90 degrees, and the diameter of the connecting end of each water spray nozzle (20-1) and the rotary injection pipe (20) is larger than that of the water outlet end.

4. The negative pressure self-priming backwash device as claimed in claim 3, wherein: the sewage suction nozzle (19) is close to one end of the fine filter screen (7) and is arranged to be arc-shaped, and the arc-shaped end of the fine filter screen (7) is consistent with the arc-shaped end of the fine filter screen.

5. The negative pressure self-priming back flush device of claim 4, wherein: the sewage seal box (10) is of a fully-closed structure, and the top of the sewage seal box is provided with a detachable seal cover plate (10-1).

6. The negative pressure self-priming backwash device as claimed in claim 5, wherein: the reciprocating screw (21) is crossed with threads, and two ends of a screw opening between the two crossed threads are respectively communicated.

7. The negative pressure self-priming backwash device as claimed in claim 6, wherein: an electromagnetic valve (24) is arranged on the sewage draining pipe (12), and the electromagnetic valve (24) is connected with the controller (4).

8. The negative pressure self-priming backwash device as claimed in claim 7, wherein: the filter body casing (1) is provided in a cylindrical shape.

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