CN113606155B

CN113606155B - Deep well pump with filter

Info

Publication number: CN113606155B
Application number: CN202110939069.0A
Authority: CN
Inventors: 陈宜文; 吴培祥; 熊坤亮
Original assignee: Zhejiang Taifu Pump Co Ltd
Current assignee: Zhejiang Taifu Pump Co Ltd
Priority date: 2021-08-16
Filing date: 2021-08-16
Publication date: 2023-05-23
Anticipated expiration: 2041-08-16
Also published as: CN113606155A

Abstract

The invention discloses a deep-well pump with a filtering device, which solves the problem that the existing deep-well pump has poor protection effect on particles falling into water from the outside in the actual application process, and adopts the following technical scheme: a deep well pump with a filtering device comprises a controller, a motor and a water lifting device, wherein the motor is connected with the controller in a transmission way, the motor is arranged in a machine barrel, and a supporting device for supporting a motor rotor is arranged at the lower end side of the machine barrel; the water lifting device is arranged in the upper cylinder, the upper cylinder and the machine barrel are coaxially connected and fixed through the connecting frame, and the upper cylinder is provided with a water inlet facing the connecting frame. The filtering device comprises a circular sand prevention barrel, the sand prevention barrel is sleeved on the periphery of a deep well pump in a gap manner, a sealing structure is arranged between the upper end of the sand prevention barrel and the upper barrel, a water inlet is positioned in the axial length range of the sand prevention barrel, the lower end of the sand prevention barrel extends downwards to at least the position of the barrel, the inner diameter of the sand prevention barrel is larger than the outer diameter of the barrel, and a gap between the sand prevention barrel and the barrel is communicated with the water inlet.

Description

Deep well pump with filter

Technical Field

The invention relates to a deep-well pump, in particular to a deep-well pump with a filtering device, which can block particles sinking from the water surface in a water source area.

Background

Deep well pumps are used to lift water up in relatively deep water sources, particularly deep wells. The deep-well pump is normally suspended by the lifting rope under the working state and is semi-suspended below the water surface, and the deep-well pump cannot be contacted with the bottom of the water body, so that the deep-well pump is generally used without considering the sand prevention requirement of the bottom of the water body. However, in the water source area, due to the environmental changes, particles such as sand and stone often fall to the water source area. When the deep-well pump works, stronger liquid flow in the approximately horizontal direction can be formed at the water inlet of the deep-well pump, when particles sink, the particles falling down can be carried to the filter screen by the liquid flow and blocked by the filter screen, so that smooth water inflow of the deep-well pump can be influenced, and the working efficiency of the deep-well pump can be further influenced.

Chinese patent document (publication No. CN 208778264U) discloses a submerged motor pump with axial-flow sand-proof structure, which comprises a motor, a water pump and a rotating shaft driven by the motor, an upper bearing seat is arranged between the motor and the water pump, a water inlet node is fixed on the upper bearing seat, an upper bearing seat, a mechanical seal, an axial-flow impeller, a shaft sleeve and an electric pump impeller are sequentially sleeved on the rotating shaft, a flow guiding sleeve is fixed on the upper bearing seat, the flow guiding sleeve comprises an annular outer shell and an annular inner shell which are coaxially arranged, the inner shell is lower than the outer shell, the outer shell is sleeved outside the axial-flow impeller, the inner shell is sleeved outside the joint surface of the mechanical seal dynamic-static ring, the flow guiding sleeve and the axial-flow impeller form an axial-flow pump, a gap between the outer shell at the lower end of the flow guiding sleeve and the inner shell is a water inlet, and the upper end of the flow guiding sleeve is a water outlet. Compared with the traditional sand throwing sleeve, the axial flow sand prevention structure of the submersible electric pump has better sand prevention effect, improves the service life of mechanical seal, and further prolongs the service life of the submersible electric pump.

In the electric pump with the axial-flow sand-proof structure, an inner cylinder and an outer cylinder which are coaxially arranged are arranged at the inner side of a water inlet section. When the electric pump is used, if external particles fall to a water source and sink, if the travelling path is close to the water inlet of the water inlet section, the external particles are easily brought into the water inlet section by water flow to be collected, so that the effect of preventing external sand particles of the electric pump is not ideal.

Disclosure of Invention

The invention aims to solve the technical problems that: the deep-well pump with the filtering device is capable of well protecting particles falling below the water surface from the outside and convenient to clean.

The technical scheme adopted for solving the technical problems is as follows: a deep well pump with a filtering device comprises a controller, a motor and a water lifting device, wherein the motor is connected with the controller in a transmission way, the motor is arranged in a machine barrel, and a supporting device for supporting a motor rotor is arranged at the lower end side of the machine barrel; the water lifting device is arranged in the upper cylinder, the upper cylinder and the machine barrel are coaxially connected and fixed through the connecting frame, the upper cylinder is provided with a water inlet facing the connecting frame, and the water lifting device is characterized in that the filtering device is used for blocking particles in the sinking process from the water surface, the filtering device comprises a sand prevention cylinder sleeved on the outer peripheral surface of the upper cylinder, a sealing structure is arranged between the upper end of the sand prevention cylinder and the upper cylinder, the lower end of the sand prevention cylinder extends downwards and is sleeved on the periphery of the machine barrel, the inner diameter of the sand prevention cylinder is larger than the outer diameter of the machine barrel, and a gap between the sand prevention cylinder and the machine barrel is communicated with the water inlet.

The water lifting device can be of a screw rod structure or a plurality of staggered blade structures, and the screw rod or the blades rotate to lift water under the drive of the motor. The water inlet is generally positioned on the lower end surface of the upper cylinder, and after the water lifting device works, water enters the upper cylinder from the water inlet and is lifted by the water lifting device. The sand prevention cylinder is a cylinder-shaped object which is additionally arranged on the periphery of the existing deep well pump, and the lower end of the sand prevention cylinder is positioned at the lower side of the water inlet on the upper cylinder.

Further, the upper end part of the upper cylinder is coaxially provided with a water outlet pipe which is communicated with the inside of the upper cylinder, and the sealing structure is fixedly connected to the water outlet pipe. The sealing structure is connected and fixed on the water outlet pipe, thereby facilitating the arrangement of the sand prevention cylinder.

Further, the sealing structure comprises a rubber pad, a through hole is formed in the rubber pad along the axial direction of the upper cylinder, a screw cap is embedded in the rubber pad, and a screw penetrates through the wall body of the sand prevention cylinder to be in threaded connection with the screw cap. The sand prevention cylinder is connected to the rubber pad through the screw, so that the sand prevention cylinder is conveniently connected and fixed, and the sand prevention cylinder is conveniently detached, so that adhered particles are conveniently cleaned.

Further, two rubber pads are arranged oppositely, semi-cylindrical grooves are respectively formed in the opposite side surfaces of the two rubber pads, and the two side surfaces are attached together so that the two grooves form the through holes. The rubber pads are arranged into two blocks, so that the rubber pads are conveniently connected and fixed with the deep-well pump.

Further, the outer peripheral surface of the rubber pad is provided with a ring groove, a hoop is arranged in the ring groove, the wall body of the hoop protrudes outwards to form a U-shaped structure, and when the two rubber pads are bonded and fixed, the clamp is used for clamping the U-shaped structure to tighten the hoop. The two rubber pads can be connected and fixed together through bolts, the two rubber pads are tightly held by the anchor ear through the arrangement of the anchor ear and the operation of the clamp on the anchor ear, and the connection of the two rubber pads is very convenient.

Further, the sand control device also comprises an external induction head, the induction head is electrically connected with the controller through a wire, the wire penetrates through the sealing structure and extends out of the sand control cylinder, and the induction head corresponds to the upper cylinder in position under the suspension of the wire; the upper cylinder is electrically connected with the controller. The induction head is arranged, when the water level of the water source area is lowered, the controller cuts off the working power supply of the motor through the isolation of the passage between the induction head and the upper cylinder, so that the deep well pump stops working, and the deep well pump is prevented from being damaged due to water shortage.

Further, the sand prevention barrel is electrically connected with the controller, a sheath is sleeved on the periphery of the induction head, a plurality of through holes are formed in the sheath, and the sheath achieves blocking between the induction head and the sand prevention barrel. The sand prevention cylinder is made of stainless steel and is electrically connected with the water outlet pipe through a screw cap. The outer periphery of the induction head is sleeved with the sheath, the sheath is made of insulating materials, and the sheath achieves physical separation between the induction head and the sand prevention barrel, so that false touch between the induction head and the sand prevention barrel is avoided, the working power supply of the motor can be cut off in time after the water level drops by a certain amplitude, and the working safety of the deep well pump is guaranteed.

Further, the supporting device comprises a cylindrical supporting sleeve, a blocking structure arranged on the machine barrel axially blocks the closed end of the supporting sleeve, an opening end of the supporting sleeve supports the supporting structure, and a bearing sleeved on the rotor shaft is arranged on the supporting structure; the outer peripheral surface of the supporting sleeve is attached to the inner peripheral surface of the machine barrel, and the oil passing structure is communicated with the two ends of the supporting sleeve. The blocking structure may be a plug disposed within the barrel, which may be a tight fit, or threaded connection, between the plug and the barrel. The blocking structure can also be a reducing ring formed by reducing the inner diameter of the cylinder wall body, and the reducing ring provides blocking support for the supporting sleeve. The supporting sleeve has certain axial dimension, and the outer peripheral face of supporting sleeve is laminated with the inner peripheral face of barrel to make the supporting sleeve have good radial stability in the barrel, the supporting sleeve can provide good axial support for the rotor shaft. The existence of the supporting sleeve also makes the requirement on the thickness of the wall body of the machine barrel low, and the supporting sleeve can provide radial support for the machine barrel, so that the strength of the machine barrel can be improved. The oil passing structure can be the oil groove, and also can be the oil hole arranged at the closed end of the supporting sleeve, and the flow of lubricating oil is realized by arranging the oil passing structure, so that the working requirement of the deep well pump is met.

Further, the support structure comprises a cylindrical support cylinder, the bearing is arranged on the inner bottom surface of the support cylinder, and the rotor shaft is inserted into the support cylinder from the opening end of the support cylinder. The cylindrical support cylinder can well adapt to the support requirement of the support sleeve, the radial stability of the support cylinder in the machine barrel is good, and good support effect can be provided for the rotor shaft through the cooperation of the support sleeve and the support cylinder.

Further, a plurality of notches are arranged on the wall body at the opening end of the supporting sleeve, and an oil groove is arranged on the outer peripheral surface of the supporting sleeve along the axial direction of the supporting sleeve corresponding to the positions of the notches. Through the combination of breach and oil groove, and constitute oil-through structure, simple structure can satisfy oil-through effect well.

Compared with the prior art, the invention has the advantages that: the sand prevention cylinder is sleeved on the periphery of the deep well pump, and the lower end of the sand prevention cylinder stretches into the position of the machine barrel. When the deep-well pump works, water flow outside the deep-well pump cannot directly enter the water inlet due to the limitation of the sand prevention barrel, general strong water flow is formed outside the pump, water is dispersed into the sand prevention barrel from the periphery of the lower end part of the sand prevention barrel due to the dispersion effect of the sand prevention barrel, and water flow needs to be reversed after entering the sand prevention barrel, so that particles in the sedimentation process outside the pump are not easy to inhale into the sand prevention barrel, and the sand prevention effect is ensured. In addition, even if a small amount of particles are attracted by water flow, the particles are easily blocked at the gap between the outer cylinder and the inner cylinder, and the sand prevention cylinder is loosened for the particles blocked at the gap, so that the particles are easy to clean. Due to the good sand prevention effect, water can be smoothly fed when the deep well pump works, and the service life of the water lifting device is ensured. Through being provided with the inductive head for when the water level descends below safe water level, can in time cut off the working power supply of motor, improved deep well pump's operational safety. Be used for carrying out axial support's strutting arrangement to motor rotor, laminating mutually through the interior wall surface of support sleeve and barrel that is provided with the cylinder, this strutting arrangement can provide good axial support effect for motor rotor to can provide good radial support to the barrel, it is low to the wall thickness requirement of barrel, can effectively guarantee the intensity of barrel.

Drawings

Fig. 1 is a structural view of the deep well pump in a cut-away state of a sand control cylinder.

Fig. 2 is a structural diagram of the deep well pump after the sand prevention barrel is removed.

Fig. 3 is a longitudinal cross-sectional view of fig. 2.

Fig. 4 is a perspective view of a rubber mat of a single block.

Fig. 5 is a perspective view of the sheath in one direction.

Fig. 6 is a perspective view of the sheath in another direction.

Fig. 7 is a schematic view of the fit between the support sleeve and the support cylinder.

Fig. 8 is a perspective view of the support sleeve.

Fig. 9 is a perspective view of one embodiment of a support cylinder.

In the figure: 1. a sand prevention cylinder; 2. a connecting frame; 3. a screw; 4. a rubber pad; 41. a groove; 42. a through groove; 43. a ring groove; 5. a screw cap; 6. a water outlet pipe; 7. a cylinder is arranged; 8. a barrel; 81. a diameter-reducing ring; 9. a hanging rope; 10. an induction head; 11. a wire; 12. a sheath; 121. penetrating the mouth; 122. a notch is formed; 123. a blocking portion; 13. a screw; 14. a support cylinder; 141. a support base; 142. a through hole; 143. a groove; 144. reinforcing ribs; 145. a columnar body; 15. a support sleeve; 151. a notch; 152. an oil groove; 16. a bearing; 17. a rotor shaft.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

In the deep-well pump with the filtering device, the filtering device is used for realizing the filtering blocking of particles in a water body, in particular to blocking of particles in the sinking process from the water surface. The deep-well pump is suspended at the half-depth position of the water source by the lifting rope 9 when in use, and the deep-well pump is not contacted with the bottom of the water source.

In fig. 1, the deep-well pump comprises a motor and a water lifting device, wherein the motor is in transmission connection with the water lifting device, and the water lifting device is a screw 13. The motor is arranged in the machine barrel 8, the screw 13 is arranged in the upper barrel 7, the upper barrel 7 and the machine barrel 8 are coaxially connected and fixed through the frame-type connecting frame 2, and the power output shaft of the motor penetrates through the inside of the connecting frame 2 and is connected with the screw 17, so that the screw 17 is driven to circumferentially rotate through the motor, and the water is lifted. The upper cylinder 7 is provided with a water inlet facing the connecting frame 2, the water inlet is positioned on the lower end surface of the upper cylinder 7, the water inlet is communicated with the inside of the upper cylinder 7, and an annular filter screen is arranged at the position of the connecting frame 2. The stator of the motor is fixed to the inner peripheral surface of the cylinder, and the rotor of the motor is rotatably supported on a support means provided in the cylinder 8. The operation of the motor is controlled by a controller arranged on the lower side of the machine barrel 8, and the controller receives an instruction to start the motor to operate or cut off the power supply of the motor.

The structure of the filtering device comprises a sand prevention cylinder 1 sleeved on the outer peripheral surface of an upper cylinder 7, a sealing structure is arranged between the upper end of the sand prevention cylinder 1 and the upper cylinder 7, and the lower end part of the sand prevention cylinder 1 extends to the lower side of the lower end surface of a machine barrel 8. The sand preventing cylinder 1 is cylindrical, and correspondingly, the upper cylinder 7 and the machine cylinder 8 are both cylindrical, and the connecting frame 2 is positioned in the radial range of the upper cylinder 7 and the machine cylinder 8. The outer diameters of the upper cylinder 7 and the cylinder 8 are the same, the inner diameter of the sand prevention cylinder 1 is slightly larger than the outer diameter of the cylinder 8, and the difference between the inner diameter of the sand prevention cylinder 1 and the outer diameter of the cylinder 8 is generally within five millimeters. A gap is formed between the sand preventing cylinder 1 and the cylinder 8 so that external water can enter the water inlet from the lower end of the sand preventing cylinder 1 through the gap.

The sand control cylinder 1 is generally made of stainless steel, the upper end of the sand control cylinder 1 is connected to the upper cylinder 7 through a sealing structure, and the sealing structure realizes the fixation of the sand control cylinder 1 relative to the cylinder 8, and the sand control cylinder 1 and the cylinder 8 are coaxially arranged. The upper cylinder 7 is provided with a water outlet pipe 6, the water outlet pipe 6 is communicated with the inside of the upper cylinder 7, the water outlet pipe 6 is coaxially arranged at the upper side of the upper cylinder 7, the sealing structure is directly sleeved and fixed on the water outlet pipe 6, and the water outlet pipe 6 extends to the upper side of the sealing structure.

The sealing structure is typically a block of non-metallic material, which is not required to achieve a liquid seal, but is typically required to block some macroscopic particles. In practical application, the sealing structure is usually a rubber pad 4, a through hole is arranged in the rubber pad 4 along the axial direction of the upper cylinder 7, and the water outlet pipe 6 is connected in the through hole in a penetrating way. A screw cap 5 is buried in the rubber pad 4, and the screw 3 penetrates through the wall body of the sand prevention barrel 1 to be in threaded connection with the screw cap 5, so that the sand prevention barrel 1 is fixed on the rubber pad 4. The screw cap 5 is contacted with the water outlet pipe 6 through the rubber pad 4, and the water outlet pipe 6 is electrically connected with the sand prevention cylinder 1 through the screw cap 5 and the screw 3.

In fig. 4, two rubber pads 4 are shown, and the two rubber pads 4 are oppositely combined to form a revolving body. Semi-cylindrical grooves 41 are respectively arranged on opposite sides of the two rubber pads 4, and the two sides are attached together so that the two grooves 41 form the through holes. When the connection is realized, the two rubber pads 4 are surrounded on the periphery of the water outlet pipe 6. The peripheral surface of the rubber pad 4 is provided with a ring groove 43, and the anchor ear is arranged in the ring groove 43 so that the two rubber pads 4 are attached together. The wall body of the anchor ear protrudes outwards to form a pair of U-shaped structures, after two rubber pads 4 are configured in place, the U-shaped structures are clamped by the clamp, so that the wall bodies on two sides of the U-shaped structures on the anchor ear are pulled inwards, the anchor ear tightly holds the two rubber pads 4, and connection and fixation between the two rubber pads 4 and the water outlet pipe 6 are realized.

A through groove 42 extending along the axial direction of the upper cylinder 7 is arranged on the bottom surface of the groove 41, and a lifting rope 9 for lifting the deep-well pump is embedded in the through groove 42 and extends out from the upper side of the rubber pad 4. The through slot 42 may also be embedded with other wires 11 to enable an external structure to be electrically connected to a controller in the deep well pump.

In order to realize the control of the working state of the deep-well pump, the deep-well pump stops working under the condition of too low water level. The outside of deep-well pump still is provided with external inductive head 10, and inductive head 10 is the capsule shape, and inductive head 10 passes through wire 11 and is connected with the controller electricity, and wire 11 is the patchcord, and inductive head 10 electricity is connected at the lower tip of wire 11. The lead wire 11 is fitted into the above-described penetration groove 42 and extends from the upper end side of the sand control cylinder 1 to the outside of the sand control cylinder 1. Under the suspension of the wire 11, the induction head 10 corresponds to the position of the upper cylinder 7, i.e. the induction head 10 extends into the height range of the upper cylinder 7 in vertical height. The outer periphery of the induction head 10 is wrapped with a stainless steel shell, and the lead 11 is electrically connected with the shell of the induction head 10. The upper cylinder 7 is made of metal, and the upper cylinder 7 is electrically connected with the controller through the connecting frame 2 and the machine barrel 8. The sand control cylinder 1 can be electrically connected to the controller in the same way due to the presence of the screw 3 and the nut 5.

After the deep-well pump is placed in the water body, a passage is formed between the induction head 10 and the sand prevention barrel 1 due to the existence of water, which is a precondition for the controller to start the motor to work. If water is lacking, a passage is not formed between the induction head 10 and the sand prevention barrel 1, the precondition that the controller starts the motor to work is lost, and the motor does not work, so that the deep well pump is well protected under the condition of water shortage.

In order to form absolute separation between the induction head 10 and the sand prevention cylinder 1, a sheath 12 made of an insulating material is sleeved on the periphery of the induction head 10, a plurality of through holes 121 are formed in the sheath 12, and the through holes 121 enable the shell of the induction head 10 to be exposed. The wall of the sheath 12 has a certain thickness, and in the use state, the sheath 12 leans against the outer circumferential surface of the sand control cylinder 1, so that the induction head 10 is separated from the sand control cylinder 1.

The sheath 12 is formed by integral injection molding of plastic or rubber, the sheath 12 is provided with a notch 122 along the length direction thereof, the notch 122 extends along the whole length direction of the sheath 12, and two ends of the notch 122 are respectively positioned at two ends of the sheath 12 in the length direction. Blocking portions 123 are formed at both ends of the fitting opening 122, the blocking portions 123 extend along an inner wall surface of the fitting opening 122, and the blocking portions 123 are U-shaped or C-shaped. After the induction head 10 is inserted into the sheath 12 from the position of the insertion opening 122, the two blocking portions 123 respectively abut against the two ends of the induction head 10, and the induction head 10 can be stably held in the sheath 12.

A support means is provided in the barrel 8 for supporting a rotor shaft 17 on the motor rotor. A supporting structure is arranged in the machine barrel 8, a bearing 16 sleeved on a rotor shaft 17 is arranged in the supporting structure, and the rotor shaft 17 is supported by the bearing 16 to realize axial fixation and circumferential rotation.

A cylindrical supporting sleeve 15 is arranged in the machine barrel 8, one end of the supporting sleeve 15 is open, the other end is closed, the supporting sleeve is provided with a bottom connected into a whole, and the thickness of the wall body of the supporting sleeve 15 gradually increases from one end to the other end. After the supporting sleeve 15 is arranged in the machine barrel 8, the outer peripheral surface of the supporting sleeve 15 is attached to the inner peripheral surface of the machine barrel 8, an oil through structure is formed on the supporting sleeve 15, and the oil through structure is communicated with the two axial ends of the supporting sleeve 15.

A blocking structure is provided on the barrel 8 at the underside of the support sleeve 15, one end of the support sleeve 15 supporting said supporting structure, the other end of the support sleeve 15 bearing on the blocking structure. In fig. 3, the blocking structure is shown as a reduced diameter ring 81 formed on the barrel 8, the reduced diameter ring 81 being formed by the inward shrinkage of the wall of the barrel 8.

Referring to fig. 7 and 8, a plurality of notches 151 are formed at one end of the supporting sleeve 15, and the oil passing structure is an oil groove 152 disposed on the outer peripheral surface of the supporting sleeve 15, where the oil groove 152 is disposed corresponding to the positions of the notches 151. Lubricating oil can flow between the gap 151 and the bottom side of the support sleeve 15 through the oil groove 152.

Referring to fig. 3, the support structure includes a cylindrical support cylinder 14, one end of the support cylinder 14 is open, the other end is closed, the closed end of the support cylinder 14 faces one end of the support sleeve 15, and the closed end of the support cylinder 14 is in contact with one end of the support sleeve 15. The bearing 16 is provided on the inner bottom surface of the support cylinder 14, and the rotor shaft 17 is inserted into the support cylinder 14 from the open end of the support cylinder 14.

As an example, a plurality of grooves 143 are provided on the outer circumferential surface of the support cylinder 14 in the axial direction thereof, and both ends of the grooves 143 are located at both end positions of the support cylinder 14, respectively, and lubricating oil can flow between the rotor and the support sleeve 16 through the grooves 143. In order to ensure the strength of the lower end of the support cylinder 14, a plurality of protruding and strip-shaped reinforcing ribs 144 are integrally formed on the outer bottom surface of the support cylinder 14, the reinforcing ribs 144 are arranged in a crossing manner in the radial direction of the outer bottom surface of the support cylinder 13, and the crossing points of the reinforcing ribs 144 are positioned at the center of the lower bottom surface of the support cylinder 14. In this embodiment, the rotor shaft 17 is supported by the bottom of the support cylinder 14, two protruding columns 145 are integrally formed on the outer bottom surface of the support cylinder 14, a threaded hole is provided on the inner bottom surface of the support cylinder 14 at the position of the columns 145, and the corresponding support structure can be fixed to the inner bottom surface of the support cylinder 13 by screwing in the threaded hole through a bolt, so as to realize the axial support fixation of the rotor shaft 17.

As another embodiment, as shown in fig. 7, a protruding support seat 141 is integrally formed on the inner bottom surface of the support cylinder 14, the support seat 141 is in a circular ring shape, and a through hole 142 is provided on the inner bottom surface of the support cylinder 14 at the position of the support seat 141. The bearing 16 is inserted into the support seat 141, and the through hole 142 allows the lubricant to flow therethrough.

Claims

1. A deep well pump with a filtering device comprises a controller, a motor and a water lifting device, wherein the motor is connected with the controller in a transmission way, the motor is arranged in a machine barrel, and a supporting device for supporting a motor rotor is arranged at the lower end side of the machine barrel; the water lifting device is arranged in the upper cylinder, the upper cylinder and the machine barrel are coaxially connected and fixed through the connecting frame, the upper cylinder is provided with a water inlet facing the connecting frame, and the water lifting device is characterized in that the filtering device is used for blocking particles in the sinking process from the water surface and comprises a circular sand prevention cylinder, the sand prevention cylinder is sleeved on the periphery of the deep well pump in a clearance way, a sealing structure is arranged between the upper end of the sand prevention cylinder and the upper cylinder, the water inlet is positioned in the axial length range of the sand prevention cylinder, the lower end of the sand prevention cylinder extends downwards to at least the machine barrel position, the inner diameter of the sand prevention cylinder is larger than the outer diameter of the machine barrel, and a clearance between the sand prevention cylinder and the machine barrel is communicated with the water inlet;

the supporting device comprises a cylindrical supporting sleeve, a blocking structure arranged on the machine barrel axially blocks the closed end of the supporting sleeve, an opening end of the supporting sleeve supports the supporting structure, and a bearing sleeved on the rotor shaft is arranged on the supporting structure; the outer peripheral surface of the supporting sleeve is attached to the inner peripheral surface of the machine barrel, and the oil passing structure is communicated with the two ends of the supporting sleeve; the supporting structure comprises a cylindrical supporting cylinder, a bearing is arranged on the inner bottom surface of the supporting cylinder, and the rotor shaft is inserted into the supporting cylinder from the opening end of the supporting cylinder; the wall body at the opening end of the supporting sleeve is provided with a plurality of notches, and an oil groove is arranged on the outer peripheral surface of the supporting sleeve along the axial direction of the supporting sleeve corresponding to the positions of the notches.

2. The deep-well pump of claim 1, wherein the upper end of the upper barrel is coaxially provided with a water outlet pipe which is communicated with the interior of the upper barrel, and the sealing structure is fixedly connected to the water outlet pipe.

3. The deep-well pump of claim 2, wherein the sealing structure comprises a rubber pad, a through hole is arranged in the rubber pad along the axial direction of the upper cylinder, a screw cap is embedded in the rubber pad, and a screw penetrates through the wall body of the sand-preventing cylinder to be in threaded connection with the screw cap.

4. A deep well pump according to claim 3, wherein the number of rubber pads is two, the two rubber pads are opposite, semi-cylindrical grooves are respectively arranged on opposite sides of the two rubber pads, and the two sides are attached together so that the two grooves form the through holes.

5. The deep-well pump according to claim 4, wherein the rubber pad is provided with a ring groove on the outer circumferential surface, a hoop is arranged in the ring groove, the wall body of the hoop protrudes outwards to form a U-shaped structure, and when the two rubber pads are attached and fixed, the clamp is used for clamping the U-shaped structure to tighten the hoop.

6. The deep-well pump of claim 1, further comprising an external induction head electrically connected to the controller by a wire, the wire extending outside the sand control cylinder through the sealing structure, the induction head corresponding to the upper cylinder in position under suspension of the wire; the upper cylinder is electrically connected with the controller.

7. The deep-well pump of claim 6, wherein the sand prevention barrel is electrically connected with the controller, a sheath is sleeved on the periphery of the induction head, a plurality of through holes are formed in the sheath, and the sheath achieves blocking between the induction head and the sand prevention barrel.