Flow adjusting device

Abstract

The utility model provides a flow adjusting device which comprises a driving device, a transmission device, a speed reducing device, a water nozzle structure and a water outlet connector. The transmission device comprises a connecting sleeve, a nonmagnetic isolation sleeve and a transmission shaft; wherein the top of the connecting sleeve is connected with the output end of the driving device, the top of the transmission shaft is connected to the bottom of the connecting sleeve in a sleeving mode through a non-magnetic isolation sleeve, an internal magnetic sheet is arranged on the inner side wall of the bottom of the connecting sleeve, an external magnetic sheet is arranged on the outer side wall of the top of the transmission shaft, and the internal magnetic sheet is matched with the external magnetic sheet. The upper part of the non-magnetic isolation sleeve is positioned between the internal magnetic sheet and the external magnetic sheet, and the lower part of the non-magnetic isolation sleeve is provided with a sealing connecting piece; the input end of the speed reducer is connected with the bottom of the transmission shaft, the output end of the speed reducer is connected with the top of the water nozzle structure, and the bottom of the water nozzle structure is connected with a water outlet connector. The flow adjusting device can be applied to the water distributor, and flow adjustment during water injection of all oil layers is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of downhole engineering, and particularly to a downhole flow regulating device. Background Art

[0002] In order to solve the interlayer contradiction in the process of oilfield development, the stratified water injection technology is usually adopted to make up for the underground void caused by the production of crude oil, so as to maintain or increase the pressure of the reservoir layer and achieve high and stable production of the oilfield.

[0003] Stratified water injection means that a packer is lowered into an injection well to separate oil layers with large differences, and then a water distributor is used for stratified water distribution, so that the water injection volume of high-permeability layers is controlled, and the water injection of medium and low-permeability oil layers is strengthened, so that various oil layers can play their roles.

[0004] In the prior art, when using a water distributor for stratified water injection, it is often impossible to control and adjust the water injection volume well, so that it is impossible to carry out on-demand water injection according to the actual situation of each oil layer. In addition, most of the water distributors in the prior art adopt a dynamic seal form, and the dynamic seal makes the seal parts extremely easy to wear, thus affecting the sealing effect. And because the water distributor needs to work underground, it is difficult to detect in time, which causes seal failure, and then causes water to enter the sealed part (such as a circuit module, etc.) and be damaged.

[0005] In summary, due to the above-mentioned disadvantages of the water distributor in the prior art, it is an urgent problem to be solved in the field how to propose a flow regulating device that can be used in the water distributor, so as to achieve better flow regulation. Utility Model Content

[0006] In view of this, the present utility model provides a flow regulating device, so that the flow regulating device can be applied to a water distributor to realize the flow regulation during the water injection of each oil layer, and further realize the on-demand water injection of each oil layer.

[0007] The technical solution of the present utility model is specifically realized as follows:

[0008] A flow regulating device includes: a driving device, a transmission device, a reduction device, a nozzle structure and a water outlet joint;

[0009] The transmission device includes a connecting sleeve, a non-magnetic isolation sleeve and a transmission shaft; wherein, the top of the connecting sleeve is connected to the output end of the driving device, the top of the transmission shaft is sleeved on the bottom of the connecting sleeve through the non-magnetic isolation sleeve, and an internal magnetic sheet is arranged on the inner side wall of the bottom of the connecting sleeve, and an external magnetic sheet is arranged on the outer side wall of the top of the transmission shaft. The internal magnetic sheet and the external magnetic sheet are matched, the upper part of the non-magnetic isolation sleeve is located between the internal magnetic sheet and the external magnetic sheet, and a sealing connector is arranged at its lower part;

[0010] The input end of the speed reduction device is connected to the bottom of the transmission shaft, and its output end is connected to the top of the water nozzle structure. An outlet joint is connected to the bottom of the water nozzle structure.

[0011] Preferably, a seal is externally and sealingly connected to the outside of the seal connecting member at the bottom of the non-magnetic isolation sleeve.

[0012] Preferably, both the built-in magnetic sheet and the external magnetic sheet include a plurality of N-pole magnetic sheets and a plurality of S-pole magnetic sheets. The N-pole magnetic sheets and the plurality of S-pole magnetic sheets are arranged alternately, and the N-pole magnetic sheets of the external magnetic sheet are correspondingly arranged with the S-pole magnetic sheets of the built-in magnetic sheet, and the S-pole magnetic sheets of the external magnetic sheet are correspondingly arranged with the N-pole magnetic sheets of the built-in magnetic sheet.

[0013] Preferably, the water nozzle structure includes: a housing and a water nozzle assembly; at least one water inlet hole is provided on the housing; the water nozzle assembly is arranged inside the housing and is located below the water inlet hole. The top of the water nozzle assembly is connected to the output end of the speed reduction device, and an outlet joint is connected to its bottom.

[0014] Preferably, the water nozzle assembly includes: a first moving structure and a first fixed structure;

[0015] The top of the first moving structure is connected to the output end of the speed reduction device, and at least one convex block is provided at its bottom. A notch is formed at the position where the convex block is not provided. The bottom surface of the convex block abuts against the top surface of the first fixed structure;

[0016] The first fixed structure is fixed on the flow regulating device. It has a plurality of water flow holes equal in number to the convex blocks in the middle. The water flow holes are communicated with the outlet joint, and the bottom areas of both the convex block and the notch are not less than the orifice area of the water flow holes.

[0017] Preferably, the water nozzle assembly includes: a second moving structure and a second fixed structure;

[0018] Both the second moving structure and the second fixed structure are sleeve structures. The second moving structure is sleeved inside the second fixed structure, and the second fixed structure is fixed on the flow regulating device; the top of the second moving structure is connected to the output end of the speed reduction device, and its low end is connected to the outlet joint;

[0019] At least one corresponding through hole is respectively provided on the side walls of the second moving structure and the second fixed structure, and the side wall area between the edges of the through holes of the second fixed structure is not less than the orifice area of the through holes on the second moving structure.

[0020] Preferably, the water nozzle assembly includes a third moving structure and a third fixed structure;

[0021] The third moving structure includes: a driving shaft, a trapezoidal nut, an output shaft and a moving valve;

[0022] The top of the drive shaft is connected to the output end of the reduction gear, and its bottom is fixedly connected to the trapezoidal nut;

[0023] The top of the output shaft is a trapezoidal screw, which is threadedly connected to the trapezoidal nut. A limiting device for preventing the output shaft from rotating is provided in the middle of the output shaft, and a conical movable valve is provided at the bottom of the output shaft;

[0024] The third fixed structure is fixed on the flow regulating device, and a through hole communicating with the water outlet joint is provided in the middle thereof, and the movable valve corresponds to and matches the through hole.

[0025] Preferably, the third moving structure further includes a mounting shell. The top of the mounting shell is connected to the reduction gear, and the bottom is fixed on the third fixed structure through a mounting bracket.

[0026] Preferably, a thrust combination bearing is provided on the drive shaft.

[0027] Preferably, the limiting device includes a pin and a keyway provided on the output shaft; the pin is fixed on the third fixed structure, and its lower end is arranged in the keyway of the output shaft.

[0028] As can be seen above, a flow regulating device provided by the present invention can, by reasonably designing the internal water nozzle assembly thereof, control and regulate the water injection flow rate of each oil layer corresponding to each flow regulating device during downhole stratified water injection operations, and each flow regulating device works independently, thereby realizing water injection on demand for each oil layer. Further, in the technical solution of the present invention, the transmission device is designed in the form of magnetic transmission, which can keep the non-magnetic isolation sleeve and the seal always stationary, realizing static sealing, thereby preventing the non-magnetic isolation sleeve and the seal from being worn and ensuring the sealing effect. Brief Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the flow regulating device in the embodiment of the present invention.

[0030] Figure 2 It is a schematic structural diagram of the transmission device in the embodiment of the present invention.

[0031] Figure 3 It is an installation schematic diagram of the water nozzle structure in the embodiment of the present invention.

[0032] Figure 4 It is a schematic diagram of the first moving structure in the first embodiment of the water nozzle assembly of the present invention.

[0033] Figure 5 It is a schematic diagram of the first fixed structure in the first embodiment of the water nozzle assembly of the present invention.

[0034] Figure 6It is an assembly schematic diagram of the first embodiment of the water nozzle assembly of the present utility model.

[0035] Figure 7 It is a structural schematic diagram of the second embodiment of the water nozzle assembly of the present utility model.

[0036] Figure 8 It is an assembly schematic diagram of the second embodiment of the water nozzle assembly of the present utility model.

[0037] Figure 9 It is an assembly schematic diagram of the third embodiment of the water nozzle assembly of the present utility model.

[0038] Figure 10 It is an internal structural schematic diagram of the third moving structure in the third embodiment of the present utility model. Detailed implementation manners

[0039] To make the technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] As Figures 1 to 10 shown, the present utility model provides a flow regulating device, including: a driving device 1, a transmission device 2, a reduction device 3, a water nozzle structure 4 and a water outlet joint 5;

[0041] The transmission device 2 includes a connecting sleeve 21, a non-magnetic isolation sleeve 22 and a transmission shaft 23; wherein, the top of the connecting sleeve 21 is connected to the output end of the driving device 1, the top of the transmission shaft 23 is sleeved on the bottom of the connecting sleeve 21 through the non-magnetic isolation sleeve 22, and an internal magnetic sheet 211 is provided on the inner side wall of the bottom of the connecting sleeve 21, and an external magnetic sheet 231 is provided on the outer side wall of the top of the transmission shaft 23. The internal magnetic sheet 211 matches the external magnetic sheet 231. The upper part of the non-magnetic isolation sleeve 22 is located between the internal magnetic sheet 211 and the external magnetic sheet 231, and a sealing connector 221 is provided at its lower part;

[0042] The input end of the reduction device 3 is connected to the bottom of the transmission shaft 23, and its output end is connected to the top of the water nozzle structure 4. A water outlet joint 5 is connected to the bottom of the water nozzle structure 4.

[0043] A flow regulating device provided by the utility model can be used on a water distributor for downhole layered water injection and is placed inside the housing of the water distributor. The number of flow regulating devices built into the water distributor is determined according to the number of layers of layered water injection. Each flow regulating device correspondingly controls and regulates the water injection volume of one oil layer. For example, when it is necessary to simultaneously carry out layered water injection into three underground oil layers, three flow regulating devices can be arranged inside a water distributor, so that each flow regulating device can correspondingly control the water injection flow rate of each layer, and each flow regulating device works independently. The water nozzle structure 4 on each flow regulating device is used to accurately regulate the water injection flow rate of each oil layer, thereby realizing the on-demand water injection for each oil layer.

[0044] Furthermore, in the technical solution of the utility model, the driving device 1 can be utilized to drive the connecting sleeve 21 to rotate. A plurality of built-in magnetic pieces 211 are arranged on the inner side wall of the bottom of the connecting sleeve 21, and a plurality of external magnetic pieces 231 are arranged on the outer side wall of the top of the transmission shaft 23. When the connecting sleeve 21 rotates, it drives the built-in magnetic pieces 211 to rotate. Under the action of magnetic force, the built-in magnetic pieces 211 drive the external magnetic pieces 231 to rotate, that is, drive the transmission shaft 23 to rotate. At this time, since the non-magnetic isolation sleeve 22 does not have magnetism, it will not rotate under the action of magnetic force. Therefore, when the driving device 1 works, the non-magnetic isolation sleeve 22 can always remain stationary, so that when the sealing connection member 221 at the bottom of the non-magnetic isolation sleeve 22 is connected to the seal 24, it is always a static seal, and the non-magnetic isolation sleeve and the seal will not rotate. Compared with the dynamic seal adopted in the prior art, it can prevent the seal 24 from being worn and ensure the sealing effect.

[0045] In the technical solution of the utility model, various implementation methods can be used to implement the above-mentioned flow regulating device. The following will take several implementation methods as examples to introduce the technical solution of the utility model in detail.

[0046] For example, preferably, in a specific embodiment of the utility model, when the water distributor works underground, the inside of its housing is filled with water, and the transmission device 2 and the following parts of the above-mentioned flow regulating device placed inside the housing of the water distributor are all immersed in the water body. Refer to Figure 1 , taking a water distributor with one flow regulating device as an example, the external of the sealing connection member 221 at the bottom of the non-magnetic isolation sleeve 22 is hermetically connected with a seal 24 for sealing between the transmission device 2 and the inner wall of the water distributor housing (not shown in the figure). Thus, the driving device 1 located above can be isolated by the seal 24 to prevent water from entering above the seal 24 and causing damage to the driving device 1 and the circuit module thereon. And during the working process, since neither the seal 24 nor the non-magnetic isolation sleeve 22 rotates and always maintains a static seal, the sealing effect is improved, and the service life of the seal and the driving device above is prolonged.

[0047] In another specific embodiment of the present utility model, if there are multiple flow regulating devices provided in one water distributor, the multiple flow regulating devices can be arranged side by side vertically inside the water distributor housing. The transmission devices 2 of the multiple flow regulating devices can be horizontally aligned and simultaneously sealed and connected to the same seal, so that the driving devices 1 of the multiple flow regulating devices can be simultaneously isolated by using one seal.

[0048] In addition, as an example, in a preferred specific embodiment of the present utility model, as Figure 2 shown, both the built-in magnetic sheet 211 and the external magnetic sheet 231 include multiple N-pole magnetic sheets and multiple S-pole magnetic sheets. The N-pole magnetic sheets and the multiple S-pole magnetic sheets are arranged alternately, and the N-pole magnetic sheets of the external magnetic sheet 231 are correspondingly arranged with the S-pole magnetic sheets of the built-in magnetic sheet 211, and the S-pole magnetic sheets of the external magnetic sheet 231 are correspondingly arranged with the N-pole magnetic sheets of the built-in magnetic sheet 211. By using the magnetic attraction force between the N-pole magnetic sheet and the S-pole magnetic sheet, the rotational transmission between the connecting sleeve 21 and the transmission shaft 23 can be realized.

[0049] Preferably, as an example, the non-magnetic isolation sleeve 22 can be made of stainless steel material, so that the non-magnetic isolation sleeve can be prevented from rotating by using the non-magnetic property of the stainless steel material, and thus static sealing can be realized.

[0050] In addition, as an example, in a preferred specific embodiment of the present utility model, as Figure 1 shown, the water nozzle structure 4 can include: a housing 401 and a water nozzle assembly; the housing 401 has at least one water inlet hole 402; the water nozzle assembly is arranged inside the housing and is located below the water inlet hole 402. The top of the water nozzle assembly is connected to the output end of the speed reduction device 3, and its bottom is connected with a water outlet joint 5.

[0051] In the technical solution of the present utility model, the driving device 1 drives the transmission device 2 to rotate, and after the speed is reduced by the speed reduction device 3, the opening and closing control of the water nozzle assembly is realized. Since during the operation underground, the flow regulating devices below the seal 24 are all immersed in the water body, by providing the water inlet hole 402 on the housing 401 of the water nozzle structure, the water body can enter the inside of the housing from the water inlet hole 402, and by controlling the opening and closing or the opening and closing degree of the water nozzle assembly inside the housing, the flow or non-flow of the water body and the size of the water body flow can be controlled. For example, when the water nozzle assembly inside the housing is in a fully open state, the water body can flow into the housing from the water inlet hole 402, flow through the internal water nozzle assembly and then flow out from the water outlet joint 5. Further, the bottom of the water outlet joint 5 can be connected to a pipeline leading to the corresponding oil layer, so that during water injection, the water flow rate of the oil layer can be controlled and adjusted by using this flow regulating device, and thus water injection on demand for the oil layer can be realized.

[0052] In the technical solution of the present utility model, a variety of implementation methods can be used to implement the above-mentioned water nozzle assembly. The following will take several of the implementation methods as examples to introduce the technical solution of the present utility model in detail.

[0053] For example, preferably, in a specific embodiment of the present utility model, as Figures 3 to 6 shown, the water nozzle assembly may include: a first moving structure 41 and a first fixed structure 42;

[0054] The top of the first moving structure 41 is connected to the output end of the deceleration device 3, and at least one convex block 411 is provided at its bottom, and a notch 412 is formed at the position where the convex block is not provided. The bottom surface of the convex block 411 abuts against the top surface of the first fixed structure 42;

[0055] The first fixed structure 42 is fixed on the flow rate adjusting device, and has a number of water flow holes 421 equal to the number of convex blocks 411 in the middle. The water flow holes 421 are communicated with the water outlet joint 5, and the bottom areas of both the convex block 411 and the notch 412 are not less than the orifice area of the water flow hole.

[0056] In the above embodiment of the present utility model, the output end of the deceleration device 3 can drive the first moving structure 41 to rotate. When the convex block 411 at the bottom of the first moving structure 41 rotates to directly above the water flow hole 421 of the first fixed structure 42 and completely covers the water flow hole 421, the water nozzle assembly is in a completely closed state, referring to Figure 6 ; when the convex block 411 continues to rotate to completely expose the water flow hole 421 and the notch 412 is directly opposite to the water flow hole 421, the water nozzle assembly is in a completely open state; when the convex block covers a part of the water flow hole, the water flow rate of the water nozzle assembly at this time is less than its water flow rate in the completely open state. Therefore, the area of the water flow hole 421 blocked by the convex block 411 can be controlled by controlling the rotation of the first moving structure 41, so as to achieve precise control and adjustment of the water flow rate.

[0057] For another example, preferably, in another specific embodiment of the present utility model, as Figures 7 to 8 shown, the water nozzle assembly may also include: a second moving structure 43 and a second fixed structure 44;

[0058] Both the second moving structure 43 and the second fixed structure 44 may be sleeve structures. The second moving structure 43 is sleeved inside the second fixed structure 44, and the second fixed structure 44 is fixed on the flow rate adjusting device; the top of the second moving structure 43 is connected to the output end of the deceleration device 3, and its low end is connected to the water outlet joint 5;

[0059] At least one corresponding through hole is respectively provided on the side walls of the second moving structure 43 and the second fixed structure 44, and the side wall area between the edges of the through holes of the second fixed structure 44 is not less than the orifice area of the through holes on the second moving structure 43.

[0060] In the above-mentioned embodiment of the present utility model, the output end of the speed reduction device 3 can drive the second moving structure 43 to rotate. When the through hole 431 on the second moving structure 43 is completely aligned with the through hole 432 on the second fixed structure 44, water can flow into the interior of the second moving structure 43 through the through hole 432 and the through hole 431 and flow downward into the water outlet joint 5. At this time, the water nozzle assembly is in a fully open state; when the through hole 431 on the second moving structure 43 is completely aligned with the side wall of the second fixed structure 44, water cannot flow into the interior of the second moving structure 43 at this time, and the water nozzle assembly is in a fully closed state; when the through hole 431 on the second moving structure 43 is partially aligned with the through hole 432 on the second fixed structure 44, the water flow rate of the water nozzle assembly at this time is less than its water flow rate in the fully open state. Therefore, the shielding area of the through hole can be controlled by controlling the rotation of the second moving structure 43, so as to achieve precise control and adjustment of the water flow rate.

[0061] In addition, as an example, in another preferred specific embodiment of the present utility model, as Figure 9 and Figure 10 shown, the water nozzle assembly may also include a third moving structure 45 and a third fixed structure 46;

[0062] The third moving structure 45 includes: a driving shaft 451, a trapezoidal nut 454, an output shaft 455 and a moving valve 458;

[0063] The top of the driving shaft 451 is connected to the output end of the speed reduction device 3, and its bottom is fixedly connected to the trapezoidal nut 454;

[0064] The top of the output shaft 455 is a trapezoidal screw, which is threadedly connected to the trapezoidal nut 454. A limiting device for preventing the output shaft 455 from rotating is provided in the middle of the output shaft, and a conical moving valve 458 is provided at the bottom of the output shaft;

[0065] The third fixed structure 46 is fixed on the flow rate regulating device, and a through hole 461 communicating with the water outlet joint 5 is provided in the middle thereof, and the moving valve 458 is correspondingly matched with the through hole 461.

[0066] In the above-mentioned embodiment of the present utility model, the output end of the speed reduction device 3 drives the driving shaft 451 to rotate, and at the same time drives the trapezoidal nut 454 to rotate. Since a limiting device for preventing the output shaft 455 from rotating is provided on the output shaft, the trapezoidal nut 454 is in threaded transmission with the trapezoidal screw rod at the top of the output shaft 455, driving the output shaft 455 to move up and down without being able to rotate. Thus, the rotational movement of the trapezoidal nut 454 is converted into the up and down movement of the output shaft, so that the moving valve 458 at the bottom of the output shaft can block the through hole on the third fixed structure 46. By setting the moving valve 458 in a conical shape, when the tip at the bottom of the moving valve is far from the through hole 461, the water nozzle assembly is in a fully open state; as the tip of the moving valve moves down into the through hole, the water flow rate passing through begins to decrease until the moving valve completely blocks the through hole, and at this time the water nozzle assembly is in a fully closed state. Therefore, by using the transmission of the trapezoidal nut and the trapezoidal screw rod, the rotational movement can be converted into the up and down movement of the moving valve 458. By setting the moving valve in a conical shape and using its up and down movement to control the blocking area of the through hole 461, precise control and adjustment of the water flow rate can be achieved.

[0067] Preferably, as an example, in a specific embodiment of the present utility model, as Figure 10 shown, the third moving structure 45 may further include a mounting shell 453. The top of the mounting shell 453 is connected to the speed reduction device 3, and the bottom is fixed to the third fixed structure 46 through a mounting bracket 459, thereby ensuring the stability of the water nozzle assembly.

[0068] Preferably, as an example, a thrust combined bearing 452 may also be provided on the driving shaft 451, which can support and assist the rotation of the driving shaft 451.

[0069] In addition, as an example, in a preferred embodiment of the present utility model, as Figure 10 shown, the limiting device may include a pin 457 and a keyway 456 provided on the output shaft; the pin is fixed to the third fixed structure 46, and its lower end is arranged in the keyway 456 of the output shaft, so that the rotation of the output shaft can be restricted by the pin, and the output shaft 455 cannot rotate but can only move up and down.

[0070] Preferably, as an example, in a specific embodiment of the present utility model, the driving device 1 may be a motor.

[0071] Preferably, as an example, in a specific embodiment of the present utility model, the speed reduction device 3 may be a speed reducer.

[0072] In summary, in the technical solution of the present utility model, by designing a flow regulating device and reasonably designing the water nozzle assembly inside it, when performing downhole layered water injection operations, each flow regulating device can correspondingly control and regulate the water injection flow rate of each oil layer, and each flow regulating device works independently, thereby enabling water injection as needed for each oil layer. Further, in the technical solution of the present utility model, the transmission device is designed in the form of magnetic drive, which can keep the non-magnetic isolation sleeve and the seal always stationary, achieving static sealing, thereby preventing wear of the non-magnetic isolation sleeve and the seal and ensuring the sealing effect.

[0073] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the scope of protection of the present utility model.

Claims

1. A flow regulating device, characterized in that, Comprising: A driving device, a transmission device, a reduction device, a water nozzle structure and a water outlet joint; The transmission device includes a connecting sleeve, a non-magnetic isolation sleeve and a transmission shaft; wherein, the top of the connecting sleeve is connected to the output end of the driving device, the top of the transmission shaft is sleeved on the bottom of the connecting sleeve through the non-magnetic isolation sleeve, and an internal magnetic sheet is arranged on the inner side wall of the bottom of the connecting sleeve, and an external magnetic sheet is arranged on the outer side wall of the top of the transmission shaft. The internal magnetic sheet and the external magnetic sheet are matched with each other. The upper part of the non-magnetic isolation sleeve is located between the internal magnetic sheet and the external magnetic sheet, and a sealing connector is arranged at its lower part; The input end of the reduction device is connected to the bottom of the transmission shaft, and its output end is connected to the top of the water nozzle structure. The bottom of the water nozzle structure is connected with a water outlet joint.

2. The flow rate regulating device according to claim 1, characterized in that, A sealing member is externally and sealingly connected to the sealing connector at the bottom of the non-magnetic isolation sleeve.

3. The flow rate adjusting device according to claim 1, characterized in that Both the internal magnetic sheet and the external magnetic sheet include a plurality of N-pole magnetic sheets and a plurality of S-pole magnetic sheets. The N-pole magnetic sheets and the plurality of S-pole magnetic sheets are arranged alternately, and the N-pole magnetic sheets of the external magnetic sheet are correspondingly arranged with the S-pole magnetic sheets of the internal magnetic sheet, and the S-pole magnetic sheets of the external magnetic sheet are correspondingly arranged with the N-pole magnetic sheets of the internal magnetic sheet.

4. The flow rate regulating device according to claim 1, characterized in that The water nozzle structure includes: a housing and a water nozzle assembly; at least one water inlet hole is provided on the housing; the water nozzle assembly is arranged inside the housing and is located below the water inlet hole. The top of the water nozzle assembly is connected to the output end of the reduction device, and its bottom is connected with a water outlet joint.

5. The flow rate regulating device according to claim 4, wherein The water nozzle assembly includes: a first moving structure and a first fixed structure; The top of the first moving structure is connected to the output end of the reduction device, and at least one convex block is arranged at its bottom. A notch is formed at the position where the convex block is not arranged. The bottom surface of the convex block abuts against the top surface of the first fixed structure; The first fixed structure is fixed on the flow regulating device, and a plurality of water flow holes equal in number to the convex blocks are provided in the middle thereof. The water flow holes are communicated with the water outlet joint, and the bottom areas of both the convex block and the notch are not less than the orifice area of the water flow holes.

6. The flow rate regulating device according to claim 4, characterized in that The water nozzle assembly includes: a second moving structure and a second fixed structure; Both the second moving structure and the second fixed structure are sleeve structures. The second moving structure is sleeved inside the second fixed structure, and the second fixed structure is fixed on the flow regulating device; the top of the second moving structure is connected to the output end of the reduction device, and its low end is connected to the water outlet joint; At least one corresponding through hole is respectively arranged on the side walls of the second moving structure and the second fixed structure, and the side wall area between the edges of the through holes of the second fixed structure is not less than the orifice area of the through holes on the second moving structure.

7. The flow rate regulating device according to claim 4, characterized in that The water nozzle assembly includes a third moving structure and a third fixed structure; The third moving structure includes: a driving shaft, a trapezoidal nut, an output shaft and a moving valve; The top of the driving shaft is connected to the output end of the reduction device, and its bottom is fixedly connected to the trapezoidal nut; The top of the output shaft is a trapezoidal screw rod, which is threadedly connected to the trapezoidal nut. A limiting device for preventing the output shaft from rotating is arranged in the middle of the output shaft, and a conical moving valve is arranged at the bottom of the output shaft; The third fixed structure is fixed on the flow regulating device, and a through hole communicated with the water outlet joint is provided in the middle thereof, and the moving valve is correspondingly matched with the through hole.

8. The flow rate regulating device according to claim 7, characterized in that, The third moving structure further includes a mounting housing, the top of the mounting housing is connected to the deceleration device, and the bottom is fixed to the third fixed structure through a mounting bracket.

9. The flow rate regulating device according to claim 7, characterized in that A thrust combined bearing is arranged on the driving shaft.

10. The flow rate regulating device according to claim 7, characterized in that, The limiting device includes a pin and a keyway arranged on the output shaft; the pin is fixed to the third fixed structure, and its lower end is arranged in the keyway of the output shaft.

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