Flow guide shell and well pump

Abstract

The utility model belongs to the technical field of fluid conveying equipment, concretely relates to a flow guide shell and well pump, and the flow guide shell includes coaxially arranged flow guide shell body and integrally formed rubber insert. The ring plate of flow guide shell body is provided with a fan-shaped through slot, is directly punched and is processed and forms a large-area connection, and the connection strength of the insert and the body is enhanced; the inner side of the through slot is provided with a blade edge, and the second insert part of the insert is provided with a slot. When the impeller is working, the bladeless straight edge inner wall blocks the rotating trend of the insert, avoiding mis-cutting; after the insert is worn, a tool is inserted into the slot to drive the insert to rotate, the blade edge cuts the connecting part to realize quick disassembly, and the body can be repeatedly used. The well pump contains a multi-section impeller string, and is suitable for different head requirements. The utility model has high processing efficiency and stable connection, greatly reduces maintenance difficulty and use cost, prolongs equipment service life, and is suitable for agricultural irrigation, industrial water supply and other scenes.

Description

Technical Field

[0001] This utility model belongs to the field of fluid transport equipment technology, specifically relating to a flow guide shell and a well pump. Background Technology

[0002] In the field of fluid transport equipment, well pumps and other devices are widely used in agricultural irrigation, industrial water supply, and other scenarios. As a key component of well pumps and other such equipment, the performance of the guide shell plays a decisive role in the equipment's working efficiency and service life. To improve the wear resistance of the guide shell, existing technologies typically incorporate inserts as wear-resistant sacrificial layers. However, the current connection method between the insert and the guide shell body has many drawbacks. On the one hand, the connection structure is unstable; during long-term use, factors such as fluid impact and equipment vibration can easily cause the insert to loosen or even fall off. This not only seriously affects the normal operation of the guide shell but may also lead to equipment failure, significantly increasing maintenance costs and difficulty. On the other hand, when the insert wears out and needs replacement, the existing guide shell disassembly process is extremely complex, making it difficult to reuse the guide shell body, resulting in resource waste and increased operating costs. Therefore, developing a guide shell with a stable connection and easy-to-disassemble and replace inserts, and a well pump using this guide shell, has become an urgent technical problem to be solved.

[0003] The methods described in this section are not necessarily methods that had been previously conceived or adopted. Unless otherwise specified, no method described in this section should be assumed to be prior art simply because it is included in this section. Similarly, unless otherwise specified, the issues mentioned in this section should not be considered to be accepted in any prior art. Utility Model Content

[0004] The purpose of this utility model is to provide a flow guide shell and a well pump. Through the innovative design of the flow guide shell structure, it effectively solves the problems of unstable connection between the insert and the flow guide shell body, inconvenient disassembly of the insert, and difficulty in reusing the flow guide shell body in the prior art. It significantly improves the connection strength, service life and disassembly of the flow guide shell, reduces the cost of use, and improves the overall performance and reliability of the fluid transport equipment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A flow guide shell includes a flow guide shell body and an insert; The flow guide shell body includes a cylinder and an annular plate. The annular plate is fixed to the lower end of the cylinder. The through hole on the inner side of the annular plate is a liquid inlet. The annular plate also has a through groove. The inner side of the through groove has a cutting edge. The projection shape of the through groove along the axis of the cylinder is a fan shape that extends around the cylinder. The difference between the inner and outer diameters of the through groove is greater than half of the difference between the inner and outer diameters of the annular plate. The insert covers the inner side of the cylinder corresponding to the impeller area and the upper and lower end faces of the ring plate and fills the through groove. The area where the insert fills the through groove is the connecting part. When the guide shell body rotates relative to the insert, the cutting edge can cut the connecting part.

[0006] Furthermore, the insert includes a first insert portion, a second insert portion, and a third insert portion. The first insert portion covers the inner side of the cylinder corresponding to the impeller area, the second insert portion covers the upper surface of the ring plate and is connected to the first insert portion, and the third insert portion covers the lower surface of the ring plate. The connecting portion fills the through groove and is connected to the second insert portion and the third insert portion.

[0007] Furthermore, the upper end of the second insert has several slots that are circularly distributed around the axis of the cylinder.

[0008] Furthermore, the through groove is formed by an inner arc-shaped edge, a first straight edge, an outer arc-shaped edge, and a second straight edge connected at the first and second ends, and the inner arc-shaped edge and the outer arc-shaped edge are concentric with the ring plate.

[0009] Furthermore, the cutting edge is only located at the first straight edge or the second straight edge.

[0010] Furthermore, both the first straight edge and the second straight edge point to the center of the ring plate.

[0011] Furthermore, the annular plate has multiple through slots, which are spaced apart around the axis of the cylinder.

[0012] Furthermore, the insert is a one-piece molded structure.

[0013] Furthermore, the insert is made of rubber.

[0014] A well pump includes a pump shaft and a plurality of impeller strings disposed on the pump shaft. Each impeller string includes a guide shell and guide vanes and impellers disposed in the upper and lower parts of the inner cavity of the guide shell. The guide shell is any of the guide shells described above.

[0015] This utility model has at least the following beneficial effects: Combining processing efficiency and connection strength: The fan-shaped through-slot design is suitable for direct punching processing, which greatly improves production efficiency compared to traditional complex processing methods. At the same time, the through-slot structure design allows the insert and the guide shell body to form a large-area fit connection on the inside and outside. Combined with the spaced distribution of multiple through slots, the connection strength between the two is significantly enhanced, laying a structural foundation for long-term stable use.

[0016] Outstanding connection stability: The insert is made of rubber and molded in one piece, avoiding the weak points caused by splicing structures. By covering key areas of the guide shell body in multiple parts, combined with the tight engagement of the through groove and the connection part, it effectively resists the risk of loosening caused by fluid impact and equipment vibration. At the same time, the straight-edged inner wall without blades blocks the rotational torque generated during normal operation, avoiding the problem of accidental cutting that may occur during equipment operation, further ensuring the reliability and stability of the connection.

[0017] Easy to maintain and highly efficient in resource utilization: With the slot design on the insert, maintenance personnel can drive the insert to rotate relative to the flow guide shell body by inserting a simple tool into the slot. Combined with the cutting edge on the inside of the through groove, the connection part can be precisely cut. The insert can be quickly disassembled and replaced without complicated tools and cumbersome procedures. The flow guide shell body can be reused, avoiding the waste of resources that the entire part needs to be replaced due to insert wear in traditional structures, and greatly reducing the cost of use and maintenance.

[0018] Significant Practicality and Promotional Value: When this guide shell is applied to a well pump, the rubber material of the insert can effectively withstand fluid impact and friction loss, protecting the guide shell body from damage and significantly improving the working efficiency and service life of the well pump. The number of impeller sections of the well pump can be flexibly adjusted according to the actual head requirements, making it suitable for various fluid transportation scenarios such as agricultural irrigation and industrial water supply. The overall structural design takes into account stability, convenience, and economy, and has broad prospects for promotion and application. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic cross-sectional view of a well pump in one embodiment of the present invention; Figure 2 for Figure 1 Enlarged structural diagram at point A; Figure 3 This is a schematic diagram of the flow guide shell in one embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the flow guide shell body in one embodiment of the present invention; Figure 5 for Figure 4 Enlarged structural diagram at point B; Figure 6 This is a schematic diagram (partial cross-section) of the insert in one embodiment of the present invention.

[0020] The meanings of the labels in the attached diagram are as follows: The components include: a guide shell body 1, a cylinder 11, an annular plate 12, a liquid inlet 121, a through groove 122, an inner arc-shaped edge 122a, a first straight edge 122b, an outer arc-shaped edge 122c, a second straight edge 122d, a cutting edge 123, an insert 2, a first insert part 21, a second insert part 22, a slot 221, a third insert part 23, a connecting part 24, a guide vane 3, an impeller 4, and a pump shaft 5. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Reference Figures 1-6 As shown, in this embodiment, the flow guide shell includes a flow guide shell body 1 and an insert 2. The flow guide shell body 1 is composed of a cylinder 11 and an annular plate 12. The annular plate 12 is fixed to the lower end of the cylinder 11 and the two are coaxially arranged to ensure a stable fluid flow path. The through hole on the inner side of the annular plate 12 is a liquid inlet 121, providing a smooth channel for the fluid. The annular plate 12 is provided with a through groove 122. The projection of the through groove 122 along the axis of the cylinder 11 is a fan shape that extends around the cylinder 11. This fan-shaped structure is suitable for direct punching processing, which significantly improves efficiency compared to complex processing methods. Moreover, the difference between the inner and outer diameters of the through groove 122 is greater than half of the difference between the inner and outer diameters of the annular plate 12, so that the insert 2 and the flow guide shell body 1 form a direct large-area connection on the inner and outer sides, which greatly enhances the connection strength. A cutting edge 123 is provided on the inner side of the through groove 122, which is formed by the inner arc-shaped edge 122a, the first straight edge 122b, the outer arc-shaped edge 122c, and the second straight edge 122d connected end to end. The inner arc-shaped edge 122a and the outer arc-shaped edge 122c are concentric with the ring plate 12, and the first straight edge 122b and the second straight edge 122d both point towards the center of the ring plate 12, ensuring that the through groove 122 is subjected to uniform force and that the insert 2 has a high degree of filling and fitting. In this embodiment, the cutting edge 123 is only provided at the first straight edge 122b, and the second straight edge 122d is a straight edge without a cutting edge; in other embodiments, the cutting edge 123 may be only provided at the second straight edge 122d, and the first straight edge 122b may be a straight edge without a cutting edge. The cutting edge 123 is machined and polished to provide an efficient cutting function for the removal of the insert 2.

[0023] Insert 2 is a one-piece molded structure made of rubber, including a first insert part 21, a second insert part 22, a third insert part 23, and a connecting part 24, avoiding weak points in the splicing and improving the overall strength and wear resistance. The first insert part 21 covers the area inside the cylinder 11 corresponding to the impeller 3, directly bearing the fluid impact and friction when the impeller 4 rotates, protecting the guide shell body 1; the second insert part 22 covers the upper end face of the ring plate 12 and is connected to the first insert part 21, and its upper end is provided with several slots 221 distributed in a circle around the axis of the cylinder 11, providing convenience for the disassembly operation of insert 2; the third insert part 23 covers the lower end face of the ring plate 12; the connecting part 24 fills the through groove 122 and is connected to the second insert part 22 and the third insert part 23. With the help of the large-area fitting structure of the fan-shaped through groove 122, the connection stability between insert 2 and guide shell body 1 is further enhanced. In this embodiment, the ring plate 12 is provided with multiple through slots 122, which are distributed at intervals around the axis of the cylinder 11; in other embodiments, the number of through slots 122 can be adjusted according to actual needs, and the core is to enhance the fixing effect through multiple connection points.

[0024] When the impeller 4 is operating normally, the water it swings in its rotational direction continuously impacts the first insert portion 21, causing the first insert portion 21 to generate a rotational torque. The direction of this torque is the same as the direction in which the insert 2 rotates relative to the guide shell body 1 to cut the connecting portion 24. At this time, this rotational torque is transmitted through the connecting portion 24 to the inner wall of the straight edge without a cutting edge of the through groove 122 (in this embodiment, the inner wall of the second straight edge 122d). This inner wall effectively blocks the rotational tendency of the connecting portion 24, preventing accidental cutting during normal operation of the equipment and ensuring connection stability.

[0025] During assembly, molten rubber is injected into the pre-set mold cavity of the guide shell body 1 through injection molding process, filling the inner side of the cylinder 11, the upper and lower end faces of the ring plate 12, and the entire area of ​​the through groove 122. After cooling and molding, the insert 2 is tightly connected to the guide shell body 1, the connecting part 24 fits into the through groove 122, and the cutting edge 123 is in close contact with the side of the connecting part 24. No additional connecting parts are required, making the operation simple and able to resist the risk of loosening caused by fluid impact and equipment vibration.

[0026] When the insert 2 is worn and needs to be replaced, no complicated tools are required. The maintenance personnel can insert the corresponding tool into the slot 221 and rotate the insert 2 relative to the guide shell body 1 around the axis of the cylinder 11 by turning the tool. The cutting edge 123 simultaneously produces a precise cutting effect on the connecting part 24. After the connecting part 24 is gradually cut off, the insert 2 can be easily removed from the guide shell body 1. After replacing the new insert 2, the guide shell body 1 can be reused to avoid resource waste. The whole operation is simple and quick, greatly reducing the difficulty of maintenance.

[0027] This embodiment also provides a well pump, including a pump shaft 5 with a plurality of impeller strings on the pump shaft 5. Each impeller string includes the aforementioned guide shell and guide vanes 3 and impellers 4 located at the upper and lower parts of the guide shell's inner cavity. During assembly, the guide vanes 3 are positioned and connected to the guide shell via slots 221, and the impellers 4 are fixed to the pump shaft 5 and located within the inner region of the first insert portion 21. During operation, fluid enters the inner cavity of the guide shell through the inlet 121, is pressurized by the impellers 4, and is guided by the guide vanes 3 to the next impeller string. The rubber material of the insert 2 withstands impact and friction, and the straight-edged inner wall without cutting edges and the force-bearing fit with the connecting portion 24 prevents accidental cutting, ensuring stable operation of the well pump. After the insert 2 wears, it can be quickly disassembled and replaced using the slots 221, efficiently restoring the well pump's working performance. In other embodiments, the number of impeller strings can be adjusted according to the head requirements.

[0028] In summary, the guide shell and well pump of this embodiment achieve multiple beneficial effects through optimized structural design: the fan-shaped through groove 122 is suitable for direct punching processing, improving processing efficiency, and the large-area connection structure on the inner and outer sides enhances the connection strength between the insert 2 and the guide shell body 1; the one-piece molded rubber insert 2, combined with multi-part coverage and multi-slot positioning, and the torque blocking effect of the straight inner wall without a cutting edge during normal operation, avoids the problem of easy loosening and falling off of the insert and accidental cutting, ensuring long-term stable operation of the equipment; the coordinated design of the slot 221 and the cutting edge 123 enables quick disassembly of the insert 2 without complicated tools and cumbersome processes, reducing maintenance difficulty, while the guide shell body 1 can be reused, reducing resource waste and usage costs; after the well pump uses this guide shell, the working efficiency and service life are significantly improved, and the convenience of maintenance is greatly optimized. It is suitable for various fluid transportation scenarios such as agricultural irrigation and industrial water supply, and its practicality and promotion value are outstanding.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0033] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A flow guide shell, characterized in that, Includes the flow guide shell body and inserts; The flow guide shell body includes a cylinder and an annular plate. The annular plate is fixed to the lower end of the cylinder. The through hole on the inner side of the annular plate is a liquid inlet. The annular plate also has a through groove. The inner side of the through groove has a cutting edge. The projection shape of the through groove along the axis of the cylinder is a fan shape that extends around the cylinder. The difference between the inner and outer diameters of the through groove is greater than half of the difference between the inner and outer diameters of the annular plate. The insert covers the inner side of the cylinder corresponding to the impeller area and the upper and lower end faces of the ring plate and fills the through groove. The area where the insert fills the through groove is the connecting part. When the guide shell body rotates relative to the insert, the cutting edge can cut the connection part.

2. The flow guide shell according to claim 1, characterized in that: The insert includes a first insert portion, a second insert portion, and a third insert portion. The first insert portion covers the inner side of the cylinder corresponding to the impeller area. The second insert portion covers the upper surface of the ring plate and is connected to the first insert portion. The third insert portion covers the lower surface of the ring plate. The connecting portion fills the through groove and is connected to the second insert portion and the third insert portion.

3. The flow guide shell according to claim 2, characterized in that: The upper end of the second insert has several slots arranged in a circular pattern around the axis of the cylinder.

4. The flow guide shell according to claim 1, characterized in that: The through groove is formed by the inner arc-shaped edge, the first straight edge, the outer arc-shaped edge, and the second straight edge connected at the first and second ends. The inner arc-shaped edge and the outer arc-shaped edge are concentric with the ring plate.

5. The flow guide shell according to claim 4, characterized in that: The cutting edge is located only at the first straight edge or the second straight edge.

6. The flow guide shell according to claim 4, characterized in that: Both the first straight edge and the second straight edge point to the center of the ring plate.

7. The flow guide shell according to claim 1, characterized in that: The ring plate has multiple through slots, which are spaced apart around the axis of the cylinder.

8. The flow guide shell according to claim 1, characterized in that: The insert is a one-piece molded structure.

9. The flow guide shell according to claim 1, characterized in that: The insert is made of rubber.

10. A well pump, comprising a pump shaft, a plurality of impeller strings disposed on the pump shaft, the impeller strings comprising a guide shell and guide vanes and impellers disposed in the upper and lower parts of the inner cavity of the guide shell, characterized in that: The flow guide shell is the flow guide shell according to any one of claims 1-9.

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