Anti-rotation flow guide shell and well pump

Abstract

The invention belongs to the technical field of fluid conveying equipment, and particularly relates to an anti-rotation flow guide shell and a well pump. A protrusion is arranged at the upper end of a cylinder of the flow guide shell body, and a through hole with a cutting edge is formed in a bottom plate. The insert comprises a first insert part made of a flexible material, a ring groove at the lower end of the first insert part sleeves the upper end of the barrel and completely covers the bulge to form a barrier for preventing silt from invading, and the first insert part radially deforms when being extruded to enhance friction with the barrel and the guide vane flow guide part to stop rotation; the second insert part, the third insert part and the fourth insert part cover the surface of the runner; and the connecting part penetrates through the through hole. The insert serves as a wear-resistant sacrificial layer protection body, and the flow guide shell body is forced to rotate relative to the insert, so that the cutting edge cutting connecting part realizes convenient replacement of the insert and cyclic utilization of the body. The bottom plate is arranged on the abutting groove of the through hole opposite to the rotating side of the impeller, working torque can be blocked, mistaken cutting can be prevented, and the connecting strength is improved through the multiple circles of circumferential staggered through holes. The problems that rotation fails due to silt, the abrasion-resistant layer is difficult to disassemble, and resources are wasted are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid conveying equipment, and particularly relates to an anti-rotation guide shell and a well pump. Background Art

[0002] In the field of fluid conveying equipment, well pumps and other equipment are widely used in scenarios such as agricultural irrigation and industrial water supply. As a key component of well pumps and other equipment, the performance of the guide shell plays a decisive role in the working efficiency and service life of the equipment. Multi-stage pumps are a common type of well pump. In multi-stage pumps, adjacent guide shells and guide vanes are usually pressed together to prevent rotation. The deformation of the fitting part between the guide vanes and the guide shell is the key to maintaining the anti-rotation. However, when the pump is running at high speed or high head, the guide vanes are easily deformed by force, resulting in a change in the compression deformation of the fitting part. At this time, the guide shell will rotate under the action of hydraulic centrifugal force, causing the pump to fail.

[0003] In the prior art, one would consider providing axial cams on the upper end of the guide shell to press into the corresponding position of the guide vanes, thereby increasing the compression deformation and the anti-rotation friction area. The cams can clamp the guide vanes, thereby improving the anti-rotation capability. However, in actual outdoor or complex environments, before the guide shell is assembled, impurities such as mud and sand can easily enter the gaps between the cams. This mud and sand that enters the gaps can hinder the normal assembly of the guide shell, making it difficult or even impossible to assemble it properly, seriously reducing assembly efficiency and quality, and thus increasing assembly and maintenance costs.

[0004] The approaches described in this section are not necessarily approaches that have been previously conceived or employed. Unless otherwise indicated, it should not be assumed that any approach described in this section is prior art simply by virtue of its inclusion in this section. Similarly, unless otherwise indicated, the issues raised in this section should not be considered as having been recognized in any prior art. Summary of the Invention

[0005] The present invention aims to provide an anti-rotation guide shell and a well pump containing the same. Through innovative structural design, the problem of mud and sand entering the raised gap before assembly of the existing guide shell and affecting assembly is solved. At the same time, the anti-rotation ability of the guide shell is enhanced, the service life of the guide shell is improved, the insert and the guide shell body are conveniently disassembled, and the use cost is reduced.

[0006] To achieve the above object, a technical solution adopted by the present invention is:

[0007] An anti-rotation guide shell includes an insert body and an insert;

[0008] The guide shell body includes:

[0009] A cylinder, wherein the upper end of the cylinder has a plurality of protrusions distributed around the axis of the cylinder;

[0010] A bottom plate, the bottom plate is fixed to the lower end of the cylinder, and the bottom plate has a liquid inlet;

[0011] The insert comprises:

[0012] The first insert is made of a flexible material and has an annular groove at its lower end. It is positioned at the upper end of the cylinder and completely covers each of the protrusions through the annular groove. By installing the first insert made of a flexible material at the upper end of the cylinder of the guide housing body, its annular groove covers the protrusions, forming a physical protective barrier that effectively prevents impurities such as mud and sand from entering the gaps between the protrusions. This resolves the problem of impurity interference before assembly, ensures smooth assembly of the guide housing, and lays the foundation for the subsequent anti-rotation structure.

[0013] Furthermore, the first insert portion includes an outer tube portion, an inner tube portion located inside the outer tube portion, and a ring body connected to the outer tube portion and the upper end of the inner tube portion. The inner wall of the outer tube portion, the outer wall of the inner tube portion, and the bottom wall of the ring body together form the annular groove. The above structure specifically discloses the specific structural composition of the first insert portion. The outer tube portion, inner tube portion, and ring body together form the annular groove. This structural design makes the annular groove regular in shape, more compatible with the protrusion, ensures a tight fit, and provides reasonable structural support for the mating installation with the tube body.

[0014] Furthermore, the outer and inner sides of the upper end of the barrel have outer and inner receiving grooves, respectively, for accommodating the outer and inner barrel portions. The outer and inner receiving grooves on the barrel form a precise nesting fit with the outer and inner barrel portions of the first insert, facilitating positioning and assembly during installation. After installation, they enhance the stability of the connection between the insert and the barrel, improving anti-rotation capabilities.

[0015] Furthermore, the bottom plate has a through hole, the inner side of the through hole has a cutting edge, and the position of the bottom plate corresponding to the cylinder is a plane;

[0016] The insert further comprises:

[0017] a second insert portion, the second insert portion covering the inner side surface of the cylinder and connected to the first insert portion;

[0018] a third insert portion, the third insert portion covering the upper end surface of the bottom plate and connected to the second insert portion;

[0019] a fourth insert portion, the fourth insert portion covering the lower end surface of the bottom plate;

[0020] a connecting portion, the connecting portion passing through the through hole and connected to the third insert portion and the fourth insert portion;

[0021] As the guide housing rotates relative to the insert, the cutting edge cuts the connection. The design of the baseplate through-holes and the connection between the cutting edge and the various insert components ensures that the insert fully covers the guide housing, acting as a wear-resistant layer to protect the insert. When the insert wears, the relative rotation of the guide housing and insert allows the cutting edge to cut the connection, allowing for easy removal of the insert, replacement, and recycling of the insert.

[0022] Furthermore, the projection shape of the through hole along the axis of the cylinder is an arc shape extending around the cylinder;

[0023] The bottom plate features an abutment groove extending through the cutting edge, located at the end of the through-hole facing away from the impeller's rotation direction. The groove is connected to the through-hole and has a diameter that is equal to or smaller than the width between the radial inner and outer walls of the through-hole. The arc-shaped projection of the through-hole and the placement of the abutment groove optimize the trajectory and effectiveness of the cutting edge's connection. Furthermore, the abutment groove prevents rotation of the connection caused by impeller water flow during normal operation, preventing accidental cutting and ensuring connection stability.

[0024] Furthermore, the bottom plate has a plurality of through holes distributed around the axis of the cylinder;

[0025] Multiple through-holes at the same radius, distributed around the cylinder axis, form a circle. Multiple circles of through-holes are radially distributed around the cylinder, with adjacent circles of through-holes spaced circumferentially. These multiple, circumferentially spaced through-holes on the baseplate strengthen the connection between the insert and the guide housing both circumferentially and radially, distributing force more evenly and improving overall structural reliability. They also allow for simultaneous cutting of multiple locations during disassembly, enhancing both efficiency and smoothness.

[0026] Furthermore, the outer diameter of the outer cylinder portion matches the outer diameter of the cylinder, and the inner diameter of the inner cylinder portion matches the inner diameter of the cylinder. The matching dimensions of the outer and inner cylinder portions and the cylinder ensure that the first insert fits tightly against the cylinder after installation, ensuring assembly accuracy and smoothness during installation. Once installed, the insert can fully enhance abutment strength when subjected to extrusion and deformation, further improving anti-rotation performance.

[0027] Furthermore, the cross-sectional shape of the protrusion gradually increases from top to bottom. The cross-sectional shape of the protrusion is small at the top and large at the bottom. During assembly, the small end facilitates insertion into the mating component, while the large end forms an inverted wedge-like effect, tightening with increasing force, enhancing the connection stability with other components, preventing axial loosening, and improving the overall anti-rotation effect when mated with the insert.

[0028] Furthermore, the insert is made of rubber. The insert utilizes the flexibility of rubber to closely fit the surface of the guide housing body and the protrusions, forming a good seal and protection. Thanks to the wear resistance of rubber, it effectively acts as a wear-resistant sacrificial layer, extending the service life of the guide housing. The elastic deformation properties of the rubber material also help enhance the anti-rotation connection strength.

[0029] The present invention also proposes a well pump, comprising a pump shaft, a plurality of impeller strings arranged on the pump shaft, the impeller string comprising a guide shell and guide vanes and impellers arranged at the upper and lower parts of the inner cavity of the guide shell, the guide shell being any of the guide shells described above, the guide vanes having a ring connection portion and a guide portion, the ring connection portion being fixedly connected to the upper end of the guide portion, and having an outer diameter larger than the outer diameter of the guide portion, and when the guide vanes are assembled on the guide shell, the guide portion will extend into the interior of the guide shell until the lower end of the ring connection portion abuts against the upper end of the guide shell. Applying the above-mentioned anti-rotation guide shell to the well pump ensures that the guide shell, guide vanes and impellers are stably assembled during the operation of the well pump, effectively preventing the guide shell from rotating, ensuring the coordinated and stable operation of the various components of the well pump, improving the working efficiency, reliability and service life of the well pump, and being applicable to a variety of complex working conditions.

[0030] The anti-rotation guide shell and well pump of the present invention have many significant beneficial effects:

[0031] Guaranteed assembly efficiency and quality: The flexible first insert and its annular groove completely cover the protrusion on the upper end of the cylinder before assembly, forming an effective protective barrier that prevents impurities such as mud and sand from entering the gap between the protrusions, avoiding assembly difficulties caused by impurity accumulation and significantly improving assembly efficiency and quality. The first insert has a simple structure and is easy to clean, making it more efficient than directly cleaning the concave and convex structures of the cylinder.

[0032] Enhanced anti-rotation performance: After the first insert is installed in place, the ring body is squeezed to produce radial deformation, squeezing the inner wall of the cylinder on the one hand and the outer wall of the guide part on the other hand, greatly enhancing the radial abutment strength. Combined with the friction force generated by the squeezing of the protrusion and the guide vane ring connection, reliable anti-rotation is achieved, effectively improving the anti-rotation ability of the guide shell and ensuring the stability of equipment operation.

[0033] Improve wear resistance and reduce costs: The insert serves as a wear-resistant sacrificial layer. The second, third, and fourth insert parts fully cover the flow channel surface of the guide shell body, concentrating the wear on the insert and protecting the body structure. When the insert is worn, the connection part is cut using the inner edge of the bottom plate through-hole for easy disassembly. Only the insert needs to be replaced, making the guide shell body recyclable and reducing resource waste and usage costs.

[0034] Optimized disassembly and connection stability: The disassembly process does not require additional tools and can be completed only by relying on the structure of the guide shell itself. It is easy to operate and suitable for a variety of scenarios. The abutment groove design of the bottom plate effectively prevents unnecessary cutting caused by fluid impact during normal operation of the equipment, ensuring connection stability. Multiple circles of circumferentially spaced through holes enhance the connection strength in all directions from the circumferential and radial directions, ensuring a stable connection between the insert and the guide shell body. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0036] Figure 1 This is a schematic structural diagram of an anti-rotation guide shell according to an embodiment of the present invention;

[0037] Figure 2 This is a schematic cross-sectional view of an embodiment of a well pump according to the present invention;

[0038] Figure 3 for Figure 2 A schematic diagram of the structure at center A;

[0039] Figure 4 for Figure 3 A magnified schematic diagram of the structure at B in the middle;

[0040] Figure 5 This is a schematic structural diagram of the guide housing body in an embodiment of the anti-rotation guide housing of the present invention;

[0041] Figure 6 for Figure 5 A magnified schematic diagram of the structure at C in the middle;

[0042] Figure 7 for Figure 5 A magnified schematic diagram of the structure at D in the middle;

[0043] Figure 8 Schematic diagram of the structure of the insert in one embodiment of the anti-rotation guide shell of the present invention (partially cut away);

[0044] Figure 9 for Figure 8 A magnified schematic diagram of the structure at E in the middle;

[0045] Figure 10 This is a schematic structural diagram of the guide vanes in an embodiment of the anti-rotation guide shell of the present invention;

[0046] Figure 11 This is a schematic diagram of the operation of removing the insert of the guide shell in an embodiment of the anti-rotation guide shell of the present invention.

[0047] The meanings of the reference numerals in the accompanying drawings are:

[0048] The guide shell body 1, the cylinder 11, the outer accommodating groove 11a, the inner accommodating groove 11b, the protrusion 111, the bottom plate 12, the liquid inlet 121, the through hole 122, the cutting edge 1221, the abutment groove 1222, the insert 2, the first insert part 21, the annular groove 21a, the outer cylinder part 211, the inner cylinder part 212, the ring body 213, the second insert part 22, the third insert part 23, the fourth insert part 24, the connecting part 25, the guide vane 3, the ring connecting part 31, the guide part 32, the impeller 4, the pump shaft 5, and the fixing surface 6. DETAILED DESCRIPTION

[0049] The present invention will be further described below with reference to the accompanying drawings.

[0050] Reference Figures 1-11 As shown, an anti-rotation deflector housing according to this embodiment comprises a deflector housing body 1 and an insert 2. The deflector housing body 1, serving as the base structure, comprises a cylindrical body 11 and a base plate 12. The upper end of the cylindrical body 11 is provided with a number of protrusions 111 distributed around its axis. These protrusions 111 are key components for assembling the deflector housing with other components. The base plate 12 is fixed to the lower end of the cylindrical body 11 and has a liquid inlet 121 for fluid entry.

[0051] The guide vane 3 assembled on the guide shell of this embodiment has a ring connecting portion 31 and a guide portion 32. The ring connecting portion 31 is fixedly connected to the upper end of the guide portion 32, and its outer diameter is larger than the outer diameter of the guide portion 32. When the guide vane 3 is assembled on the guide shell, the guide portion 32 will extend into the interior of the guide shell, and the lower end of the ring connecting portion 31 will abut against the upper end of the guide shell.

[0052] The insert 2 is a key innovation of the present invention. Its first insert portion 21 is made of a flexible material and has an annular groove 21a at its lower end. During assembly, the first insert portion 21 is fitted over the upper end of the barrel 11, completely covering each protrusion 111 through the annular groove 21a. In this state, the first insert portion 21 forms a protective barrier around each protrusion 111, effectively preventing impurities such as mud and sand from entering the gaps between the protrusions 111 before assembly, thereby ensuring smooth subsequent assembly. Because the first insert portion 21 lacks a complex concave-convex structure, even some mud and sand can be easily wiped off, making it more convenient and efficient than directly cleaning the concave-convex structure on the upper end of the barrel 11. Due to its flexible nature, the first insert portion 21 deforms when squeezed, allowing it to cooperate with the protrusion 111 to squeeze the annular connection portion 31 of the guide vane 3. The friction generated by this squeezing creates a non-rotating fit.

[0053] Furthermore, the first insert 21 features a sophisticated structural design, comprising an outer cylindrical portion 211, an inner cylindrical portion 212 positioned within the outer cylindrical portion 211, and an annular body 213 connecting the upper ends of the two. The inner wall of the outer cylindrical portion 211, the outer wall of the inner cylindrical portion 212, and the bottom wall of the annular body 213 collectively form an annular groove 21a. Furthermore, an outer accommodating groove 11a and an inner accommodating groove 11b are provided on the outer and inner sides of the upper end of the cylindrical body 11, respectively, to accommodate the outer cylindrical portion 211 and the inner cylindrical portion 212. The outer diameter of the outer cylindrical portion 211 matches that of the cylindrical body 11, while the inner diameter of the inner cylindrical portion 212 matches that of the cylindrical body 11. During the installation process, this precise dimensional fit enables the first insert portion 21 to be smoothly installed on the cylinder 11; when installed in place, the ring body 213 is squeezed and deformed along the radial direction of the cylinder, which on the one hand squeezes the inner wall of the cylinder 11 and on the other hand squeezes the outer wall of the guide portion 32, thereby further improving the anti-rotation ability of the guide shell by enhancing the radial abutment strength.

[0054] In order to improve the wear resistance of the guide shell, the existing technology usually sets a wear-resistant sacrificial layer on the guide shell. However, the current connection method between the wear-resistant sacrificial layer and the guide shell body has many disadvantages. On the one hand, the connection structure is unstable. During long-term use, it is affected by factors such as fluid impact and mechanical vibration, and the wear-resistant sacrificial layer is very easy to loosen or even fall off. This not only seriously affects the normal operation of the guide shell, but may also cause equipment failure, thereby significantly increasing the repair cost and maintenance difficulty; on the other hand, when the wear-resistant sacrificial layer is worn and needs to be replaced, the existing guide shell disassembly process is extremely complicated, and it is difficult to reuse the guide shell body, resulting in a waste of resources, and also increasing the cost of use. Therefore, in response to these problems, this implementation has made the following improvements.

[0055] In this embodiment, the bottom plate 12 is provided with a through hole 122, the inner side of which has a cutting edge 1221, and the position of the bottom plate 12 corresponding to the cylinder 11 is flat. The insert 2 also includes a second insert portion 22, a third insert portion 23, a fourth insert portion 24, and a connecting portion 25. The second insert portion 22 covers the inner side surface of the cylinder 11 and is connected to the first insert portion 21; the third insert portion 23 covers the upper end surface of the bottom plate 12 and is connected to the second insert portion 22; the fourth insert portion 24 covers the lower end surface of the bottom plate 12; and the connecting portion 25 passes through the through hole 122 and is connected to the third insert portion 23 and the fourth insert portion 24. This design allows the insert 2 to directly bear the impact and wear of the fluid, rather than the deflector body 1, thereby concentrating the wear on the insert 2 and protecting the body structure.

[0056] In this embodiment, the insert 2 is made of rubber, and the guide housing body 1 is made of stainless steel. The second insert portion 22, the third insert portion 23, the fourth insert portion 24, and the connecting portion 25 can be directly molded onto the guide housing body 1, forming a stable connection via the connecting portion 25. The first insert portion 21 can be connected to the second insert portion 22 by bonding or welding. After actual assembly, the first insert portion 21 at the top of the insert 2 is clamped between the protrusion 111 and the upper ring connecting portion 31, while the edge of the fourth insert portion 24 at the bottom of the insert 2 is clamped between the bottom plate 12 (lower end surface) and the upper end surface of the ring connecting portion 31 of the guide vane 3 located below it. This ensures the overall structural strength of the insert, ensuring that it remains firmly connected to the body despite long-term exposure to external forces such as fluid impact and equipment vibration.

[0057] When the insert 2 is worn, it can be easily disassembled using the cutting edge 1221 on the inside of the through hole 122 of the bottom plate 12. The disassembly operation is to rotate the deflector shell body 1 relative to the insert 2. During this process, the cutting edge 1221 will cut the connecting portion 25 that passes through the through hole 122, separating the insert 2 into an upper and lower part, so that it can be separated from the body. Since only the insert 2 needs to be replaced instead of the entire deflector shell, the deflector shell body 1 can be recycled, avoiding the entire deflector shell from being scrapped due to failure of the wear-resistant layer. This not only extends the actual service life of the deflector shell, but also reduces the cost of use through component replacement, solving the problems of unstable connection and complex disassembly of the wear-resistant sacrificial layer in the prior art.

[0058] When removing insert 2, please refer to Figure 11As shown, two guide shells can be disassembled using the following disassembly method. Specifically, the first insert portion 21 of the insert 2 of one guide shell is removed from covering the protrusions 111 (due to its elasticity, the first insert portion 21 can be directly removed and then stored in the guide shell). The protrusion 111 at the upper end of the guide shell is then brought into contact with the fourth insert portion 24 of the guide shell to be disassembled. The guide shell to be disassembled is then placed on the lower side and the other guide shell is placed on the upper side, so that the first insert portion 21 of the guide shell to be disassembled is brought into contact with a fixing surface 6. Then, one hand presses down and rotates the upper guide shell at the same time (the direction of rotation is the direction in which the cutting edge 1221 can achieve cutting). Pressing will cause the disassembled guide shell to form a large friction force with the fixed surface 6, making it difficult for the lower guide shell to rotate relative to the fixed surface 6, that is, to keep the two fixed (the other hand can be used to assist in fixing). Pressing will also press the protrusion 111 of the upper guide shell into the fourth insert portion 24 of the guide shell to be disassembled, so that the protrusion 111 of the upper guide shell and the fourth insert portion 24 of the lower guide shell remain relatively fixed. The rotation will cause the protrusion 111 of the upper guide shell to drive the fourth insert part 24 to rotate relative to the bottom plate 12 of the upper guide shell (since the contact position between the fourth insert part 24 and the bottom plate 12 is a plane and the friction is minimal, the contact position between the two becomes the place where the relative rotation of the two guide shells occurs). At this time, the cutting edge 1221 on the inner side of the through hole 122 of the bottom plate 12 of the lower guide shell will cut the connecting part 25, thereby separating the insert 2 from the guide shell body 1, so that the insert 2 can be replaced and the guide shell body 1 can be recycled. This disassembly process relies entirely on the structure of the guide shell itself, and there is no need to use special disassembly tools such as wrenches and pliers, which reduces the requirements for operating equipment. On-site staff can complete the disassembly work with just their hands, which greatly improves the convenience of disassembly. It is especially suitable for scenes where tools are inconvenient to carry, such as in the field and at construction sites.

[0059] In this embodiment, the base plate 12 is provided with an abutment groove 1222 extending through the cutting edge 1221 at the end of the through-hole 122 facing away from the direction of rotation of the impeller 4. This abutment groove 1222 is connected to the through-hole 122 and has a diameter that is less than or equal to the width between the radial inner and outer walls of the through-hole 122. During normal operation of the impeller 4, water spun in the direction of its rotation impinges on the second insert portion 22, generating a rotational torque in the same direction as the impeller 4's rotation. This torque is also in the same direction as the rotation of the guide housing body 1 relative to the insert 2, which cuts the connection portion 25. At this point, the rotational torque exerted on the second insert portion 22 is transmitted through the connection portion 25 to the inner wall of the abutment groove 1222. This abutment groove 1222 effectively blocks the rotation of the connection portion 25, preventing unnecessary cutting during normal operation and ensuring a stable connection. For example, when the guide housing body 1 rotates clockwise (as viewed from above) relative to the insert 2, the cutting edge 1221 cuts the connecting portion 25. The abutment groove 1222 is located counterclockwise of the through-hole 122. During normal operation of the impeller 4, when the impeller 4 rotates clockwise, the swirling water strikes the second insert 22, generating a rotational torque that causes the second insert 22 to rotate clockwise. This force exerts a clockwise force on the connecting portion 25, and the inner wall of the abutment groove 1222 tightly abuts the connecting portion 25, creating a barrier and counteracting the clockwise rotation of the connecting portion 25.

[0060] When the diameter of the abutment groove 1222 is equal to the width between the radial inner and outer walls of the through hole 122, under the premise that the connecting portion 25 can be completely cut, this design maximizes the contact area between the connecting portion 25 and the abutment groove 1222, and at the same time, the cross-sectional area of ​​the connecting portion 25 is also maximized, thereby significantly enhancing the connection strength between the connecting portion 25 and the third insert portion 23 and the fourth insert portion 24, and further improving the overall connection stability between the insert 2 and the guide shell body 1.

[0061] In this embodiment, the base plate 12 has multiple through-holes 122 distributed around the axis of the cylinder 11. Multiple through-holes 122 at the same radial position form a circle. Multiple circles of through-holes 122 are radially distributed around the cylinder 11, and the through-holes 122 in two adjacent circles are circumferentially spaced. This multi-circle, spaced-apart design of through-holes 122 improves the connection strength in both the circumferential and radial dimensions. Circumferentially, the multiple through-holes 122 form an annular connection structure, evenly distributing force. In the radial direction, the multiple circles of through-holes 122 further enhance the stability and reliability of the connection, ensuring a tight connection between the insert 2 and the guide shell body 1.

[0062] In this embodiment, the cross-sectional shape of the protrusion 111 gradually increases from top to bottom, and the longitudinal cross-sectional shape is approximately an isosceles triangle. This shape design helps to better cooperate with other components during assembly and enhances the connection stability.

[0063] This embodiment also provides a well pump, comprising a pump shaft 5, a plurality of impeller trains disposed on the pump shaft 5, the impeller train comprising a guide housing, guide vanes 3 disposed at the upper and lower portions of the inner cavity of the guide housing, and impellers 4, wherein the guide housing is any of the guide housings described above. The guide vanes 3 have an annular connection portion 31 and a guide portion 32, the annular connection portion 31 being fixedly connected to the upper end of the guide portion 32 and having an outer diameter greater than that of the guide portion 32. When the guide vanes 3 are assembled on the guide housing, the guide portion 32 extends into the interior of the guide housing, while the lower end of the annular connection portion 31 abuts against the upper end of the guide housing, thereby achieving stable assembly and coordinated operation of the various components of the well pump.

[0064] In summary, the present invention provides an anti-rotation guide shell and a well pump including the same, wherein the flexible material insert 2, especially the annular groove 21a of the first insert part 21 thereof, completely covers the upper end protrusion 111 of the cylinder 11 to form a protective barrier to prevent mud and sand from invading the protrusion gap to ensure assembly, and utilizes the first insert part 21 to be squeezed and radially deformed to enhance the friction contact strength with the cylinder 11 and the guide part 32 to achieve reliable anti-rotation; at the same time, the insert 2 serves as a wear-resistant sacrificial layer to fully cover the flow channel surface of the guide shell body 1; the second insert part 22 covers the inner side of the cylinder; the third insert part 23 and the fourth insert part 24 cover the upper and lower end surfaces of the bottom plate to protect the body from wear, and it passes through the bottom plate through hole 1 through the connecting part 25 22 and the molding method realize stable connection, and the design of the inner edge 1221 of the through hole 122 allows the core advantage of the guide shell body 1 to be recycled by replacing only the insert 2 by forcing the guide shell body 1 to rotate relative to the insert 2 and cutting the connection part 25, wherein the abutment groove 1222 provided on the bottom plate 12 can effectively prevent the wrong cutting caused by the fluid impact when the impeller 4 is working to maintain the operation stability, and the through holes 122 with multiple circles of circumferential staggered distribution significantly enhance the connection strength and the convenience of disassembly. Finally, the system solves the problems of waste of resources and high maintenance cost caused by rotation failure caused by mud and sand, severe wear and difficulty in disassembling the wear-resistant layer in the prior art, and is particularly suitable for harsh working conditions such as multi-stage well pumps.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0067] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0068] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature. In the present invention, the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and integrate the different embodiments or examples, and features of different embodiments or examples, described in this specification, without conflict.

[0069] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. An anti-rotation guide shell, characterized in that: including an insert body and an insert; The guide shell body includes: A cylinder, the upper end of which has a plurality of protrusions distributed around the axis of the cylinder; a bottom plate, which is fixed to the lower end of the cylinder and has a liquid inlet; The insert comprises: The first insert part is made of a flexible material and has an annular groove at its lower end. The first insert part is arranged at the upper end of the cylinder and completely covers each of the protrusions through the annular groove.

2. The anti-rotation guide shell according to claim 1, characterized in that: The first insert part includes an outer tube part, an inner tube part located inside the outer tube part, and a ring body connected to the outer tube part and the upper end of the inner tube part. The inner wall of the outer tube part, the outer wall of the inner tube part and the bottom wall of the ring body together form the annular groove.

3. The anti-rotation guide shell according to claim 2, characterized in that: An outer accommodating groove and an inner accommodating groove for accommodating the outer cylindrical portion and the inner cylindrical portion are respectively provided on the outer side and the inner side of the upper end of the cylindrical body.

4. The anti-rotation guide shell according to claim 3, characterized in that: The bottom plate has a through hole, the inner side of the through hole has a cutting edge, and the bottom plate is flat at a position corresponding to the cylinder; The insert further comprises: a second insert portion, which covers the inner side surface of the cylinder and is connected to the first insert portion; a third insert portion, which covers the upper end surface of the bottom plate and is connected to the second insert portion; a fourth insert portion, which covers the lower end surface of the bottom plate; a connecting portion, which passes through the through hole and is connected to the third insert portion and the fourth insert portion; When the guide shell body rotates relative to the insert, the cutting edge can cut the connecting portion.

5. The anti-rotation guide shell according to claim 4, characterized in that: The projection shape of the through hole along the axis of the cylinder is an arc shape extending around the cylinder; The bottom plate is provided with an abutment groove penetrating the cutting edge at one end of the through hole away from the impeller rotation direction. The abutment groove is communicated with the through hole, and the diameter thereof is less than or equal to the width between the radial inner and outer walls of the through hole.

6. The anti-rotation guide shell according to claim 5, characterized in that: The bottom plate is provided with a plurality of through holes distributed around the axis of the cylinder; The plurality of through holes at the same radial position distributed around the axis of the cylinder form a circle. The through holes are distributed in multiple circles radially around the cylinder, and the through holes in two adjacent circles are circumferentially spaced apart.

7. The anti-rotation guide shell according to claim 3, characterized in that: The outer diameter of the outer cylinder portion matches the outer diameter of the cylinder, and the inner diameter of the inner cylinder portion matches the inner diameter of the cylinder.

8. The anti-rotation guide shell according to claim 1, characterized in that: The cross-sectional shape of the protrusion gradually increases from top to bottom.

9. The anti-rotation guide shell according to claim 1, characterized in that: The insert is made of rubber material.

10. A well pump comprising a pump shaft and a plurality of impeller trains arranged on the pump shaft, wherein the impeller train comprises a guide housing and guide vanes and impellers arranged at the upper and lower parts of an inner cavity of the guide housing, characterized in that: The guide shell is the guide shell according to any one of claims 1 to 9, the guide vane has a ring connecting portion and a guide portion, the ring connecting portion is fixedly connected to the upper end of the guide portion, and the outer diameter is larger than the outer diameter of the guide portion. When the guide vane is assembled on the guide shell, the guide portion will extend into the interior of the guide shell until the lower end of the ring connecting portion abuts against the upper end of the guide shell.

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