Automatic regulation and control device for water injection

Abstract

The utility model discloses an automatic water injection regulation and control device which comprises an automatic water injection regulation and control device body. The water injection automatic regulation and control device body comprises a regulation and control box, a pressurization cabin arranged on the regulation and control box, a connector fixedly communicated with the left side of the pressurization cabin, a water tank arranged on the right side of the regulation and control box and a water pump fixedly connected to the bottom of the water tank and fixedly communicated with the right side of the pressurization cabin. According to the utility model, a series of structures are arranged, so that solid residue impurities can be filtered out by water pretreatment when the water pump pumps and utilizes water, the phenomena of blockage and aggravated abrasion and damage caused by the fact that a large amount of impurities directly enter the water pump and subsequent structures are prevented, and the use effect is improved; when the flow velocity value is reduced to be lower than a preset value, the filter screen can be automatically turned and subjected to back flushing, cleaning, dredging and deslagging, continuous stable and smooth filtering work is guaranteed, solid slag can be independently discharged in a back flushing, cleaning, dredging and deslagging mode, the phenomena of water waste and serious external moisture caused by integrated discharging of a large amount of water are avoided, and the service life of the filter screen is prolonged. The use effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of oilfield water injection, specifically to an automatic control device for water injection. BACKGROUND

[0002] Oilfield water injection uses water injection wells to inject water into oil layers to supplement and maintain the pressure of oil layers. After an oilfield is put into development, the energy of the oil layer will be consumed continuously as the development time increases, resulting in a continuous decrease in the pressure of the oil layer, a large amount of degassing of underground crude oil, an increase in viscosity, a significant reduction in the production of oil wells, and even a stop of blowing and production, causing a large amount of dead oil to remain underground and not be extracted. In order to make up for the underground depletion caused by the extraction of crude oil, maintain or improve the pressure of the oil layer, achieve high and stable production of the oilfield, and obtain a high recovery rate, it is necessary to inject water into the oilfield. With the further development of water flooding in the oilfield, the injection pressure increases year by year, and the under-injection wells increase year by year, which cannot achieve the planned water injection. Therefore, a booster water injection pump is installed on the well site to facilitate the secondary injection of high-pressure water from the water injection station to the water injection well. However, the booster device used for general oilfield water injection is not convenient for adjusting the pressure, which affects the use, and the filter screen in the water injection pipeline is prone to blockage, affecting the normal operation of the water injection work.

[0003] To this end, according to the search report of the novelty search agency, the publication number CN217925834U discloses an automatic control device for high-pressure water injection of a single well in an oilfield, which comprises a control box, a control system, a water pump, and a water tank. The water tank is connected to the water pump through a water inlet pipe. The inside of the control box is provided with a pressurizing cabin, and the left end of the pressurizing cabin is connected with a double-tube connector. The automatic control device for high-pressure water injection of a single well in an oilfield provided by the disclosure can adjust the pressure by setting a water pressure gauge inside the control device, and can control the propeller in real time according to the water pressure in the pressurizing cabin, so as to adjust the pressure. At the same time, under the control of the control device, the propeller can rotate in the opposite direction, and the filter screen can be back-flushed by the cooperation between the valves, solving the problem of water pressure reduction caused by filter screen blockage. The connection head can be lengthened by splicing, so that multiple groups of water injection pipes can be connected at one time, improving the practicability of the device. The water injection pipes can be fixed by the fixing bolts, which facilitates the disassembly of the subsequent water injection pipes.

[0004] The automatic control device for high-pressure water injection of a single well in an oilfield disclosed by the above-mentioned technology can adjust the pressure by setting a water pressure gauge inside the control device, and can control the propeller in real time according to the water pressure in the pressurizing cabin, so as to adjust the pressure. At the same time, under the control of the control device, the propeller can rotate in the opposite direction, and the filter screen can be back-flushed by the cooperation between the valves, solving the problem of water pressure reduction caused by filter screen blockage. The connection head can be lengthened by splicing, so that multiple groups of water injection pipes can be connected at one time, improving the practicability of the device. The water injection pipes can be fixed by the fixing bolts, which facilitates the disassembly of the subsequent water injection pipes.

[0005] 1. The filter screen is arranged in the water pump after the working process, cannot pre-filter and intercept the solid residue particles impurities in the water when pumping, which leads to the solid residue particles impurities directly entering and jamming in the water pump, aggravating the wear and damage phenomenon, and reducing the use effect; 2. Using the backflushing cleaning method, a large amount of water is easily contained in the solid residue and discharged together, which leads to water waste and serious external moisture phenomenon; In view of this, in view of the above shortcomings, we propose an automatic water injection control device to solve the above problems. Content of the utility model

[0006] The utility model discloses a kind of automatic water injection control devices, to solve the problems proposed in the above background technology.

[0007] To achieve the above object, the utility model provides the following technical scheme: an automatic water injection control device, including the automatic water injection control device body, the automatic water injection control device body includes control box, is set on control box and is fixedly connected with the left side of pressurized cabin Connection head, water tank is set in the right side of control box and is fixedly connected with the right side of pressurized cabin and is fixed in water tank bottom Water pump, propeller is installed in pressurized cabin;Wherein the other specific component structure of automatic water injection control device body, and the principle of pressure regulating and controlling water injection are prior art, in addition this component and technology have been disclosed in the above prior art CN217925834U, same with it, this is not described additionally again;

[0008] The water inlet of the water pump is communicated with the right bottom of the water tank and is fixed with a self-cleaning residue discharging type pre-filter mechanism; the self-cleaning residue discharging type pre-filter mechanism comprises a ball sleeve, a ball is movably sleeved in the ball sleeve, an L-shaped channel is formed in the left side and the bottom of the ball, a water pipe that is communicated with the left side of the L-shaped channel is fixed between the left side of the ball sleeve and the right bottom of the water tank, a liquid flow rate sensor that is communicated with the bottom of the L-shaped channel is fixed between the bottom of the ball sleeve and the water inlet of the water pump, a filter screen is fixedly sleeved in the L-shaped channel, an L-shaped residue discharging pipe is fixedly communicated with the right side of the ball sleeve, a U-shaped plate is fixedly connected to the top of the ball sleeve, a ventilation back blowing dredging assembly for back blowing and cleaning and discharging residue of the filter screen is rotatably embedded in the top of the ball sleeve, the ball is fixedly sleeved on the ventilation back blowing dredging assembly, a rotary driving assembly for driving the ventilation back blowing dredging assembly to rotate is fixedly installed on the inner wall of the top of the U-shaped plate, a PLC controller is fixedly installed on the left top of the U-shaped plate, and the water pump, the liquid flow rate sensor, the ventilation back blowing dredging assembly and the rotary driving assembly are electrically connected with the PLC controller; the water pump is arranged to sequentially draw water in the water tank through the liquid flow rate sensor, the L-shaped channel and the water pipe when starting, and supply the water into the pressurizing cabin to perform pressurizing work, the filter screen is arranged to filter and intercept solid residue impurities in the water when the water passes through the L-shaped channel, so that the effect of pre-treating and filtering impurities is realized, and the phenomenon of blockage and damage caused by a large amount of impurities directly entering the water pump and subsequent structures is prevented, the liquid flow rate sensor is arranged to detect the flow rate of the filtered water in real time and transmit the flow rate value to the PLC controller, the rotary driving assembly is arranged to drive the ball to rotate a half turn through the ventilation back blowing dredging assembly when the flow rate value is lower than a preset value under the control of the PLC controller, and the left side of the L-shaped channel is driven to rotate to the right and align with the L-shaped residue discharging pipe by the ball rotating a half turn, and the PLC controller is arranged to control the water pump to be temporarily closed when the flow rate value is lower than the preset value, and the ventilation back blowing dredging assembly is arranged to back blow, clean and dredge the residue of the filter screen that rotates to the right under the control of the PLC controller.

[0009] Preferably, the ventilation back blowing dredging assembly comprises a rotating pipe rotatably embedded in the top of the ball sleeve, the bottom end of the rotating pipe extends into the L-shaped channel and is fixedly communicated with a fixed box, a plurality of back blowing pipe heads are fixedly communicated with the left side of the fixed box and are located on the right side of the filter screen, the ball is fixedly sleeved on the rotating pipe, the top end of the rotating pipe is fixedly communicated with a one-way valve with an outlet at the bottom, a gas pump electrically connected with the PLC controller is fixedly installed on the top of the U-shaped plate, and the top of the one-way valve is rotatably sleeved outside the gas outlet of the gas pump.

[0010] Preferably, the rotary driving assembly comprises two gears that are engaged with each other, the gear on the right side is fixedly sleeved on the rotating pipe, a servo motor with an output shaft fixedly connected with the top of the gear on the left side is fixedly installed on the inner wall of the top of the U-shaped plate, and the servo motor is electrically connected with the PLC controller.

[0011] Preferably, the ball sleeve is formed by two half spherical shells fixed oppositely, the outer side of the ball is coated with a sealing rubber skin in movable contact with the inner side of the ball sleeve, and the left side and the bottom of the sealing rubber skin are provided with communication holes communicated with the L-shaped channel.

[0012] Preferably, the top of the PLC controller is fixedly and electrically connected with an audible and visual prompt lamp, and the audible and visual prompt lamp is arranged to be turned on during cleaning under the control of the PLC controller to clearly remind personnel that the cleaning state.

[0013] Preferably, the top of the ball sleeve is provided with a circular perforation, two first bearings are fixedly sleeved in the circular perforation, and the inner rings of the first bearings are fixedly sleeved with the outer side of the rotating pipe.

[0014] Preferably, the top inner side of the one-way valve is fixedly sleeved with two sealing bearings, and the inner rings of the sealing bearings are fixedly sleeved with the outer side of the air outlet of the air pump.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] 1. The water pipe, the water pump, the liquid flow sensor, the ball, the ball sleeve, the L-shaped channel and the filter screen are matched, can filter solid impurities when the water pump is used to pump water, prevent the impurities from directly entering the water pump and subsequent structures to cause blockage and aggravate wear and damage, and improve the use effect.

[0017] 2. The ball, the ball sleeve, the L-shaped channel, the filter screen, the PLC controller, the audible and visual prompt lamp, the L-shaped residue discharging pipe, the air blowing and dredging assembly and the rotating driving assembly are matched, can detect the flow rate in real time, automatically turn the filter screen and blow and clean the filter screen when the flow rate value is lower than the preset value, ensure the stable and smooth filtering work, separately discharge the solid residue by the blowing and cleaning dredging mode, avoid the waste of water and the serious external moisture phenomenon caused by the water and the residue being discharged together, improve the use effect, and clearly remind personnel that the cleaning state.

[0018] The utility model discloses a series of structures are set up, can filter solid impurities when the water pump is used to pump water, prevent the impurities from directly entering the water pump and subsequent structures to cause blockage and aggravate wear and damage, and improve the use effect, automatically turn the filter screen and blow and clean the filter screen when the flow rate value is lower than the preset value, ensure the stable and smooth filtering work, separately discharge the solid residue by the blowing and cleaning dredging mode, avoid the waste of water and the serious external moisture phenomenon caused by the water and the residue being discharged together, and improve the use effect. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1A structure schematic view of an automatic water injection regulating device is provided in the utility model.

[0020] Figure 2 A self-cleaning and slag-discharging type pre-filter mechanism three-dimensional structure schematic view of the automatic water injection regulating device is provided in the utility model.

[0021] Figure 3 For Figure 1 A part of the enlarged sectional structure schematic view in the utility model.

[0022] Figure 4 For Figure 3 A part of the enlarged structure schematic view in the utility model.

[0023] In the figure: 100, water tank; 101, water pump; 102, regulating box; 103, pressurizing cabin; 104, connecting head; 1, ball sleeve; 2, ball; 3, L-shaped channel; 4, water pipe; 5, liquid flow rate sensor; 6, filter screen; 7, rotating pipe; 8, fixed box; 9, back flushing pipe head; 10, air pump; 11, PLC controller; 12, audible and visual prompt lamp; 13, gear; 14, servo motor; 15, U-shaped plate; 16, L-shaped slag discharge pipe; 17, one-way valve. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0025] As Figures 1 to 4 shown, the automatic water injection regulating device provided in the embodiment includes an automatic water injection regulating device body, the automatic water injection regulating device body includes a regulating box 102, a pressurizing cabin 103 arranged on the regulating box 102, a connecting head 104 fixedly communicated with the left side of the pressurizing cabin 103, a water tank 100 arranged on the right side of the regulating box 102, and a water pump 101 fixedly connected at the bottom of the water tank 100 and communicated with the right side of the pressurizing cabin 103, and a propeller is installed in the pressurizing cabin 103.

[0026] The other specific component structures of the automatic water injection regulating device body and the pressurization and regulation water injection principle are prior art, and the component and technology have been disclosed in the above prior art CN217925834U, which is the same as this, and will not be described any further.

[0027] The water inlet of the water pump 101 is communicated and fixed with the right bottom of the water tank 100, and a self-cleaning residue discharging type pre-filter mechanism is arranged between the water inlet of the water pump 101 and the right bottom of the water tank 100; the self-cleaning residue discharging type pre-filter mechanism comprises a ball sleeve 1, a ball 2 is movably sleeved in the ball sleeve 1, an L-shaped channel 3 is arranged on the left side and the bottom of the ball 2, the ball sleeve 1 is formed by oppositely fixing two half-spherical shells, the outer side of the ball 2 is bonded and covered with a sealing rubber skin which movably contacts the inner side of the ball sleeve 1, the left side and the bottom of the sealing rubber skin are both provided with a communication hole which is communicated with the L-shaped channel 3, the sealing rubber skin is arranged to achieve the effect of movable sealing between the outer side of the ball 2 and the inner side of the ball sleeve 1, a water pipe 4 which is communicated with the left side of the L-shaped channel 3 is fixedly arranged between the left side of the ball sleeve 1 and the right bottom of the water tank 100, a liquid flow rate sensor 5 which is communicated with the bottom of the L-shaped channel 3 is fixedly arranged between the bottom of the ball sleeve 1 and the water inlet of the water pump 101, a filter screen 6 is fixedly sleeved in the L-shaped channel 3, an L-shaped residue discharging pipe 16 is fixedly arranged on the right side of the ball sleeve 1, a U-shaped plate 15 is fixedly connected to the top of the ball sleeve 1, an air blowing and dredging assembly for blowing and cleaning the filter screen 6 is rotatably arranged on the top of the ball sleeve 1, the ball 2 is fixedly sleeved on the air blowing and dredging assembly, a rotation driving assembly for driving the air blowing and dredging assembly to rotate is fixedly arranged on the inner wall of the top of the U-shaped plate 15, a PLC controller 11 is fixedly arranged on the left top of the U-shaped plate 15, the water pump 101, the liquid flow rate sensor 5, the air blowing and dredging assembly and the rotation driving assembly are electrically connected with the PLC controller 11, and a sound and light prompt lamp 12 is fixedly arranged on the top of the PLC controller 11 and electrically connected with the PLC controller 11.

[0028] The water pump 101 is arranged to sequentially draw the water in the water tank 100 through the liquid flow rate sensor 5, the L-shaped channel 3 and the water pipe 4 when starting, and supply the water into the pressurizing cabin 103 to perform pressurizing work, the filter screen 6 is arranged to filter and intercept the solid residue impurities in the water when the water passes through the L-shaped channel 3, so as to achieve the effect of pre-treating and filtering the impurities, prevent the impurities from directly entering the water pump 101 and the subsequent structure in a large amount to cause blockage and damage, the liquid flow rate sensor 5 is arranged to detect the flow rate of the filtered water in real time and transmit the flow rate value to the PLC controller 11, the rotation driving assembly is arranged to drive the ball 2 to rotate a half circle through the air blowing and dredging assembly when the flow rate value is lower than a preset value under the control of the PLC controller 11, and the left side of the L-shaped channel 3 is driven to rotate to the right and align with the L-shaped residue discharging pipe 16 by the ball rotating a half circle, the PLC controller 11 is arranged to control the water pump 101 to be temporarily closed when the flow rate value is lower than the preset value, the air blowing and dredging assembly is arranged to blow and clean the filter screen 6 which rotates to the right when the flow rate value is lower than the preset value under the control of the PLC controller 11, and the sound and light prompt lamp 12 is arranged to be turned on during the cleaning process under the control of the PLC controller 11, so as to clearly remind the personnel that the cleaning state is in progress.

[0029] Specifically, the air blowing and unblocking assembly comprises a rotating pipe 7 rotatably embedded on the top of the ball sleeve 1, wherein the top of the ball sleeve 1 is provided with a circular through hole, two first bearings are fixedly sleeved in the circular through hole, the inner ring of the first bearing is fixedly sleeved with the outer side of the rotating pipe 7, thereby achieving the effect of rotatably mounting the rotating pipe 7, the bottom end of the rotating pipe 7 extends into the L-shaped channel 3 and is fixedly connected with the fixed box 8, the left side of the fixed box 8 is fixedly connected with a plurality of blowing pipe heads 9 which are located on the right side of the filter screen 6, the ball 2 is fixedly sleeved on the rotating pipe 7, the top end of the rotating pipe 7 is fixedly connected with a one-way valve 17 with an outlet at the bottom, the top of the U-shaped plate 15 is fixedly installed with an air pump 10 electrically connected with the PLC controller 11, the top of the one-way valve 17 is sealingly rotatably sleeved on the outer side of the air outlet of the air pump 10, wherein the inner side of the top of the one-way valve 17 is fixedly sleeved with two sealing bearings, the inner ring of the sealing bearing is fixedly sleeved with the outer side of the air outlet of the air pump 10, thereby achieving the effect of sealingly rotatably mounting the one-way valve 17 on the inner side and providing the rotatable condition for the one-way valve 17; the rotating pipe 7, the fixed box 8, the blowing pipe heads 9, the one-way valve 17 and the air pump 10 are cooperated, the flow rate value of starting the air pump 10 is pre-set by the PLC controller 11, the time interval from starting to closing after the pre-set value is fifteen seconds, when the right side of the L-shaped channel 3 is rotated to the right side by the ball 2 and the flow rate value received by the PLC controller 11 is lower than the pre-set value, the air pump 10 is started by the PLC controller 11, the air pump 10 supplies air into the fixed box 8 through the one-way valve 17 and the rotating pipe 7 in sequence, the air is blown out to the right through the blowing pipe heads 9, thereby unblocking and cleaning the filter screen 6 which is rotated to the right side, the solid impurities are blown out through the L-shaped residue discharging pipe 16 by the blowing air, after fifteen seconds, the air pump 10 is automatically closed by the PLC controller 11.

[0030] Further, the rotating driving assembly comprises two gears 13 which are engaged with each other, the gear 13 located on the right side is fixedly sleeved on the rotating pipe 7, the top inner wall of the U-shaped plate 15 is fixedly installed with a servo motor 14 whose output shaft is fixedly connected with the top of the gear 13 located on the left side, the servo motor 14 is electrically connected with the PLC controller 11; the servo motor 14 and the two gears 13 are cooperated, the flow rate value of starting the servo motor 14 is pre-set by the PLC controller 11, the servo motor 14 is set to rotate half a circle each time, the pre-set value is reset after fifteen seconds after starting, when the flow rate value received by the PLC controller 11 is lower than the pre-set value, the servo motor 14 is started by the PLC controller 11 to drive the gear 13 located on the left side to rotate half a circle, the gear 13 located on the left side drives the rotating pipe 7 to rotate half a circle through the gear 13 located on the right side, the rotating pipe 7 drives the ball 2 to rotate half a circle, thereby achieving the effect of automatically controlling the ball 2 to rotate half a circle when the flow rate is lower than the pre-set value due to the blockage of the filter screen 6, the left side of the L-shaped channel 3 is rotated to the right side by the ball 2 rotating half a circle, the L-shaped residue discharging pipe 16 is aligned, the filter screen 6 is rotated to the right side, and the rotating pipe 7 is also integrally driven the blowing pipe heads 9 to rotate to the right side by the fixed box 8 when the rotating pipe 7 rotates half a circle, thereby providing the condition of blowing to the right.

[0031] The use method of the embodiment is that when the water injection automatic regulation and control device is used, the water pump 101 is turned on to sequentially draw water in the water tank 100 through the liquid flow rate sensor 5, the L-shaped channel 3 and the water supply pipe 4, and supply the water into the pressurizing cabin 103 to perform pressurizing work. The other specific component structures of the water injection automatic regulation and control device body and the pressurizing regulation and control water injection principle are prior art, and the component and the technology have been disclosed in the prior art CN217925834U. The same as the prior art, the same is not described again.

[0032] The filter screen 6 filters and intercepts the solid impurities in the water when the water passes through the L-shaped channel 3, achieving the effect of pre-treating and filtering impurities, preventing impurities from directly entering the water pump 101 and subsequent structures in large quantities, causing blockage and aggravating wear and damage, improving the use effect, and the liquid flow sensor 5 detects the flow rate of the filtered water in real time and transmits the flow rate value to the PLC controller 11. The PLC controller 11 pre-sets the flow rate value for starting the air pump 10, the audible and light prompt lamp 12 and the servo motor 14, and pre-sets the time interval for the air pump 10 and the audible and light prompt lamp 12 to start and close as fifteen seconds, and pre-sets the servo motor 14 to rotate half a circle each time and reset after fifteen seconds of starting. When the flow rate value received by the PLC controller 11 is lower than the pre-set value, the PLC controller 11 controls the servo motor 14, the audible and light prompt lamp 12 and the air pump 10 to start, and controls the water pump 101 to temporarily close. When the servo motor 14 starts, it drives the left gear 13 to rotate half a circle, and the left gear 13 drives the rotating pipe 7 to rotate half a circle through the right gear 13, and the rotating pipe 7 drives the ball 2 to rotate half a circle, achieving the effect of automatically controlling the ball 2 to rotate half a circle when the flow rate is lower than the pre-set value due to the blockage of the filter screen 6. The ball 2 rotates half a circle to drive the left side of the L-shaped channel 3 to rotate to the right and align with the L-shaped residue discharge pipe 16, and drives the filter screen 6 to rotate to the right. When the rotating pipe 7 rotates half a circle, it also integrally drives the blowpipe head 9 to rotate to the right to provide the condition for blowing to the right. When the air pump 10 starts, it supplies air to the fixed box 8 through the one-way valve 17 and the rotating pipe 7 in sequence. The gas is blown out to the right through the multiple blowpipe heads 9, and the filter screen 6 rotated to the right is blown and cleaned to dredge, and the solid impurities are blown out through the L-shaped residue discharge pipe 16. After fifteen seconds, the PLC controller 11 controls the air pump 10 and the audible and light prompt lamp 12 to automatically close, controls the servo motor 14 to reverse and start to drive the ball 2 to reset, and controls the water pump 101 to start to continue working, achieving the effect of automatically turning the filter screen 6 and blowing and cleaning it to dredge and discharge residues when the flow rate value decreases to below the pre-set value, ensuring that it continues to work stably and smoothly, and using the blowing and cleaning dredging and discharging residues method can discharge the solid residues alone, avoiding the waste of water and the phenomenon of external moisture, improving the use effect, and the audible and light prompt lamp 12 controlled by the PLC controller 11 is turned on during cleaning, which can clearly remind the person that it is in the cleaning state.

[0033] Among them, the PLC controller 11, the liquid flow rate sensor 5, the air pump 10, the audible and visual prompt lamp 12 and the servo motor 14 in the utility model are well known to those skilled in the art, belong to conventional means or common general knowledge, and those skilled in the art can make any selection according to their needs or convenience. In addition, the PLC controller 11 receives the flow rate value transmitted by the liquid flow rate sensor 5 and controls the air pump 10, the audible and visual prompt lamp 12 and the servo motor 14 to open when the preset value is reached, and controls them to close or reset when the set interval time is reached. The basic parameter setting control mode known to those skilled in the art belongs to the conventional means or common general knowledge of programming numerical control, and will not be described here.

[0034] Finally, it should be pointed out that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical scheme recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An automatic water injection control device, comprising an automatic water injection control device body, the automatic water injection control device body comprising a control box (102), a pressurization chamber (103) disposed on the control box (102), a connector (104) fixedly connected to the left side of the pressurization chamber (103), a water tank (100) disposed on the right side of the control box (102), and a water pump (101) fixedly connected to the bottom of the water tank (100) and fixedly connected to the right side of the pressurization chamber (103), wherein a propeller is installed inside the pressurization chamber (103), characterized in that: The water inlet of the water pump (101) is communicated with the right bottom of the water tank (100) and fixed with a self-cleaning residue discharging type pre-filter mechanism; The self-cleaning residue discharging type pre-filter mechanism comprises a ball sleeve (1), a ball (2) is movably sleeved in the ball sleeve (1), an L-shaped channel (3) is formed in the left side and the bottom of the ball (2), a water pipe (4) is communicated with the left side of the L-shaped channel (3) and fixed between the left side of the ball sleeve (1) and the right bottom of the water tank (100), a liquid flow rate sensor (5) is communicated with the bottom of the L-shaped channel (3) and fixed between the bottom of the ball sleeve (1) and the water inlet of the water pump (101), a filter screen (6) is fixedly sleeved in the L-shaped channel (3), an L-shaped residue discharging pipe (16) is communicated and fixed with the right side of the ball sleeve (1), a U-shaped plate (15) is fixedly connected with the top of the ball sleeve (1), a ventilation back flushing and dredging assembly for back flushing and cleaning residue of the filter screen (6) is rotatably embedded in the top of the ball sleeve (1), the ball (2) is fixedly sleeved on the ventilation back flushing and dredging assembly, a rotation driving assembly for driving the ventilation back flushing and dredging assembly to rotate is fixedly installed on the inner wall of the top of the U-shaped plate (15), a PLC controller (11) is fixedly installed on the top left side of the U-shaped plate (15), and the water pump (101), the liquid flow rate sensor (5), the ventilation back flushing and dredging assembly and the rotation driving assembly are electrically connected with the PLC controller (11).

2. The automatic injection control device of claim 1, wherein: The ventilation back flushing and dredging assembly comprises a rotating pipe (7) rotatably embedded in the top of the ball sleeve (1), the bottom end of the rotating pipe (7) extends into the L-shaped channel (3) and is communicated and fixed with a fixed box (8), a plurality of back flushing pipe heads (9) are communicated and fixed with the left side of the fixed box (8) and located on the right side of the filter screen (6), the ball (2) is fixedly sleeved on the rotating pipe (7), a one-way valve (17) with an outlet at the bottom is communicated and fixed with the top end of the rotating pipe (7), a gas pump (10) electrically connected with the PLC controller (11) is fixedly installed on the top of the U-shaped plate (15), and the top of the one-way valve (17) is rotatably sleeved outside the gas outlet of the gas pump (10).

3. The automatic injection control device of claim 2, wherein: The rotation driving assembly comprises two gears (13) meshing with each other, the gear (13) on the right side is fixedly sleeved on the rotating pipe (7), a servo motor (14) with an output shaft fixedly connected with the top of the gear (13) on the left side is fixedly installed on the inner wall of the top of the U-shaped plate (15), and the servo motor (14) is electrically connected with the PLC controller (11).

4. The automatic injection device of claim 1, wherein: The ball sleeve (1) is formed by two half-spherical shells fixedly connected with each other, the outer side of the ball (2) is bonded and covered with a sealing rubber skin in movable contact with the inner side of the ball sleeve (1), and the left side and the bottom of the sealing rubber skin are both provided with a communication hole communicated with the L-shaped channel (3).

5. The automatic injection device of claim 1, wherein: The top of the PLC controller (11) is fixedly connected with an audible and visual prompt lamp (12).

6. The automatic injection device of claim 2, wherein: The top of the ball sleeve (1) is provided with a circular perforation, two first bearings are fixedly sleeved in the circular perforation, and the inner ring of the first bearing is fixedly sleeved with the outer side of the rotating pipe (7).

7. The automatic injection device of claim 2, wherein: The top inner side of the one-way valve (17) is fixed with two sealing bearings, and the inner ring of the sealing bearings is fixed with the outer side of the air outlet of the air pump (10).

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