Water pump with sealed wear structure

Abstract

The utility model relates to a water pump with sealing wear -resisting structure, solve the existing guide vane cover and guide vane easy wear, poor sealing performance etc.

Description

Technical Field

[0001] This utility model relates to the field of water pumps, and in particular to a water pump with a sealed and wear-resistant structure. Background Technology

[0002] Existing deep well pumps are typically assembled from multiple stages of guide vanes, impellers, and guide vane covers. The sealing between adjacent guide vanes and the clamping guide vane covers, as well as between the guide vanes and adjacent positioning components and guide vane covers, all rely on pressing the mating end faces between the guide vanes and guide vane covers during assembly, or the guide vanes and positioning components pressing the mating end faces between the guide vane covers to achieve sealing.

[0003] However, due to the injection molding of the guide vanes, the end faces are uneven, and the compression of the impeller string is insufficient during assembly, resulting in the inability to achieve a complete seal.

[0004] Furthermore, when the pump operates in conditions containing silt, the silt can easily wear down the guide vane cover, increasing the gap between the guide vane cover and the impeller wear ring, thus increasing the possibility of fluid leakage. On the one hand, leaked fluid carrying silt into the gap between the guide vane and the pump casing can easily cause the impeller assembly to seize, increasing the likelihood of maintenance and the difficulty of disassembly during maintenance. On the other hand, driven by the rotating impeller, the leaking fluid continuously washes and rubs against the guide vane and guide vane cover, widening the gap between the guide vane and guide vane cover, and between the positioning component and the guide vane cover, resulting in reduced sealing reliability, causing greater fluid leakage, and affecting the hydraulic performance and normal operation of the pump. Summary of the Invention

[0005] The purpose of this utility model is to solve the above-mentioned problems existing in the prior art by providing a water pump with a sealed and wear-resistant structure. The sealed and wear-resistant structure has the functions of a guide vane cover plate, a sealing element, and wear resistance. It can ensure a suitable gap between the impeller and the sealed and wear-resistant structure, which facilitates impeller rotation and helps control the amount of fluid leakage through the gap, avoiding large-scale fluid leakage. This helps ensure the hydraulic performance of the water pump, reduces the possibility of wear on the sealed and wear-resistant structure, guide vanes, and positioning parts, thereby improving service life, reducing the probability of maintenance and replacement, and also reducing the possibility of impeller assembly jamming.

[0006] The above-mentioned technical objective of this utility model is mainly achieved through the following technical solution: a water pump with a sealed wear-resistant structure, comprising a pump casing, several sets of impeller assemblies arranged sequentially on a pump shaft within the pump casing, and positioning members arranged at both ends of the pump casing, characterized in that each set of impeller assemblies includes a guide vane, an impeller disposed in the inner cavity of the guide vane, and a sealed wear-resistant structure that cooperates with the water inlet end of the impeller, the sealed wear-resistant structure being annular, the inner edge of the sealed wear-resistant structure being a wear-resistant part, the wear-resistant part being axially press-fitted with the inlet ring of the water inlet end of the impeller, and the outer edge of the sealed wear-resistant structure sealing the gap between two adjacent guide vanes or the gap between adjacent guide vanes and the positioning member.

[0007] The difference between this technical solution and the existing technology is that it uses a sealed and wear-resistant structure to replace the conventional guide vane cover.

[0008] The sealed and wear-resistant structure functions as both a guide vane cover and a seal, while also being wear-resistant. This ensures a suitable gap between the impeller and the sealed and wear-resistant structure, facilitating impeller rotation and controlling fluid leakage through the gap. This prevents excessive fluid leakage, ensuring the pump's hydraulic performance and reducing wear on the sealed and wear-resistant structure, guide vanes, and positioning components. Consequently, it extends service life, reduces the likelihood of maintenance and replacement, and minimizes the possibility of impeller assembly jamming.

[0009] As a further improvement and supplement to the above technical solution, the present invention adopts the following technical measures: Preferably, the sealing and wear-resistant structure is provided with at least one reflux annular groove, the opening of which is axially oriented and faces the outlet of the impeller. The reflux annular groove helps to collect sediment around the sealing and wear-resistant structure, preventing it from continuously eroding and rubbing the guide vanes and / or positioning components under the influence of water flow. This improves the service life of the guide vanes and / or positioning components and ensures sealing reliability. Furthermore, the reflux annular groove is located on the outer edge of the sealing and wear-resistant structure, below the impeller outlet, i.e., near the inner wall of the guide vanes (the downwardly extending cylindrical portion). When the impeller is working, the main water flow from the previous impeller flows towards the next impeller (upward). A small portion of the water flows downward, separating from the main flow (this portion is called the diverted flow). The downward-flowing diverted flow impacts the sealing and wear-resistant structure and is blocked by the sealing and wear-resistant structure, causing it to bend back upward. During the backflow process, it carries away the silt accumulated in the return annular groove and merges into the main flow into the next impeller assembly. This helps to prevent the silt overflowing from the return annular groove from wearing down the inner walls of the guide vanes and / or positioning components, thereby improving the service life of the guide vanes and / or positioning components.

[0010] Preferably, the width of the return annular groove is 1 mm to 5 mm, and the depth is 1 mm to 3 mm. Limiting the specifications of the return annular groove helps to collect sediment and ensures that the collected sediment remains within the groove when not subjected to external forces. Simultaneously, the sediment can be re-entered into the next stage impeller assembly under the influence of the water flow, preventing sediment from accumulating and overflowing the return annular groove. Ultimately, this minimizes the scouring and frictional effects of sediment on the parts where the guide vanes and / or positioning components mate with the sealing and wear-resistant structure.

[0011] Preferably, the distance from the top of the reflux annular groove to the corresponding end cap on the impeller is greater than or equal to 2 mm. This is beneficial for temporarily retaining sediment and also allows the water flow to promptly carry away the retained sediment, preventing sediment from overflowing from the reflux annular groove.

[0012] Preferably, the sealing and wear-resistant structure includes a hard wear-resistant ring and an elastic sealing ring bonded to the wear-resistant ring. The inner diameter of the sealing ring is larger than the inner diameter of the wear-resistant ring, and adjacent guide vanes clamp the outer edge of the sealing ring to form a sealing fit. The fit between the wear-resistant ring and the impeller improves wear resistance, prevents or reduces the possibility of increased frictional clearance between the wear-resistant ring and the impeller, prevents or reduces the possibility of water leakage, and helps ensure hydraulic performance.

[0013] Preferably, the inner diameter of the wear-resistant ring is greater than or equal to the inner diameter of the inlet ring, and the inner edge of the wear-resistant ring and the inlet ring are axially press-fitted. That is, the inner diameter of the wear-resistant ring is not less than the inner diameter of the inlet ring, which prevents the wear-resistant ring from extending to the impeller inlet and helps to ensure that the impeller has a sufficiently effective water inlet area to ensure the hydraulic performance and hydraulic efficiency of the water pump.

[0014] Preferably, the sealing ring includes at least a first sealing ring portion, which is disposed on the surface of the wear-resistant ring facing the water inlet end of the impeller. A return flow groove is disposed on the outer edge of the sealing wear-resistant structure at the outer edge of the first sealing ring portion. The first sealing ring is laminated on at least one side of the wear-resistant ring facing the impeller to achieve a sealing purpose.

[0015] Preferably, to further improve sealing performance, the sealing ring further includes a second sealing ring portion and a side ring portion. The second sealing ring portion is disposed on the surface of the wear-resistant ring facing away from the impeller at the water inlet end, and the side ring portion is disposed on the outer ring surface of the wear-resistant ring. The first sealing ring portion, the second sealing ring portion, and the side ring portion are an integral structure. The sealing ring and the wear-resistant ring can be two independent components, with the sealing ring inserted into the wear-resistant ring. Alternatively, the sealing ring can be directly composite-formed onto the wear-resistant ring, making the sealing and wear-resistant structure a single component.

[0016] Preferably, the outer diameter of the wear-resistant ring is larger than the outer diameter of the reflux ring groove, so that there is a certain gap between the reflux ring groove and the guide vane and / or positioning element, so that the mud and sand can avoid the guide vane and / or positioning element as much as possible and accumulate in the reflux ring groove, preventing the mud and sand from causing wear on the guide vane and / or positioning element.

[0017] Preferably, the wear-resistant ring is made of stainless steel, ceramic, or a hard material with a wear-resistant coating, and the sealing ring is made of rubber.

[0018] The beneficial effects of this utility model are as follows: 1. The sealed and wear-resistant structure functions as both a guide vane cover and a sealing element, while also possessing wear resistance. This ensures a suitable gap between the impeller and the sealed and wear-resistant structure, facilitating impeller rotation and controlling fluid leakage through the gap. This prevents excessive fluid leakage, ensuring the hydraulic performance of the pump and reducing the likelihood of wear on the sealed and wear-resistant structure, guide vanes, and positioning components. Consequently, it extends service life, reduces the need for maintenance and replacement, and minimizes the possibility of impeller assembly jamming. 2. The sealed and wear-resistant structure is composed of a hard wear-resistant ring and an elastic sealing ring. Replacing the conventional guide vane cover with this structure not only does not increase the number of parts or affect assembly, but also enhances wear resistance and sealing performance, significantly improving the pump's hydraulic performance and service life. 3. The design of the reflux ring groove helps to collect the mud and sand around the sealing and wear-resistant structure, allowing the mud and sand to remain in the reflux ring groove. This prevents the mud and sand from continuously scouring and rubbing against the guide vanes and / or positioning components under the influence of water flow, which helps to improve the service life of the guide vanes and / or positioning components and also helps to ensure the reliability of the seal. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 yes Figure 1 A magnified schematic diagram of a portion of the structure.

[0021] Figure 3 yes Figure 2 Enlarged structural diagram of section A in the middle.

[0022] Figure 4 This is an exploded structural diagram of the guide vane, impeller, and sealing wear-resistant structure involved in this utility model.

[0023] Figure 5 yes Figure 4 A structural diagram from another perspective.

[0024] Figure 6 This is a partial structural diagram of a sealing and wear-resistant structure involved in this utility model.

[0025] In the figure: 1. Pump casing; 2. Positioning component; 3. Guide vane; 4. Impeller; 5. Sealing wear-resistant structure; 6. Return ring groove; 7. Wear-resistant ring; 8. Sealing ring; 9. First sealing ring part; 10. Second sealing ring part; 11. Side ring part; 12. Assembly stop; 13. Assembly insert ring. Detailed Implementation

[0026] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0027] Example: Figures 1-6 As shown, a water pump with a sealed and wear-resistant structure includes a pump casing 1, several sets of impeller 4 assemblies arranged in series on the pump shaft inside the pump casing 1, and positioning parts 2 arranged at both ends of the pump casing 1. The positioning parts 2 are parts used to limit the position of the impeller 4 assemblies at the outermost end, such as inlet sections, bearing seats, etc.

[0028] The difference between this technical solution and the prior art is that each impeller 4 assembly includes a guide vane 3, an impeller 4 disposed in the inner cavity of the guide vane 3, and a sealing and wear-resistant structure 5 that cooperates with the water inlet end of the impeller 4. The sealing and wear-resistant structure 5 is annular, and the inner edge of the sealing and wear-resistant structure 5 is a wear-resistant part. The wear-resistant part is axially pressed against the inlet ring of the water inlet end of the impeller 4. The outer edge of the sealing and wear-resistant structure 5 seals the gap between two adjacent guide vanes 3 or the gap between adjacent guide vanes 3 and the positioning member 2.

[0029] In this technical solution, a sealed and wear-resistant structure 5 is used to replace the conventional guide vane 3 cover plate.

[0030] In this technical solution, the sealing and wear-resistant structure 5 functions as both the guide vane 3 cover plate and a sealing element, and also has wear resistance. It ensures a suitable gap between the impeller 4 and the sealing and wear-resistant structure 5, facilitating the rotation of the impeller 4 and helping to control the amount of fluid leakage through the gap, avoiding large-scale fluid leakage, which helps to ensure the hydraulic performance of the water pump. It also helps to reduce the possibility of wear on the sealing and wear-resistant structure 5, the guide vane 3, and the positioning element 2, thereby improving service life, reducing the probability of maintenance and replacement, and also reducing the possibility of impeller 4 assembly jamming.

[0031] Next, the above technical solution will be further explained: In practical applications, the sealing and wear-resistant structure 5 is provided with at least one return annular groove 6. The opening of the return annular groove 6 is axially arranged and faces the outlet of the impeller 4. There can be one, two, or more return annular grooves 6, and adjacent return annular grooves 6 can be spaced apart or placed close together. The return annular groove 6 can be located near the outer edge of the sealing and wear-resistant structure 5, and can be set at a relatively suitable position on the sealing and wear-resistant structure 5, so as to both deposit silt and facilitate the diversion of water flow to carry away the deposited silt.

[0032] In this technical solution, the setting of the reflux ring groove 6 is conducive to the collection of mud and sand around the sealing wear-resistant structure 5, so that the mud and sand stay in the reflux ring groove 6, avoiding the mud and sand from continuously scouring and rubbing the guide vane 3 and / or positioning component 2 under the drive of water flow, which is conducive to improving the service life of the guide vane 3 and / or positioning component 2, and also conducive to ensuring the reliability of sealing.

[0033] Furthermore, the return annular groove 6 is located on the outer edge of the sealing and wear-resistant structure 5, and is situated below the outlet of the impeller 4, near the inner wall of the guide vane 3 (the downwardly extending cylindrical portion). When the impeller 4 is operating, the main water flow from the previous impeller 4 flows towards the next impeller 4 (upwards). A small portion of this water flow deviates from the main flow and flows downwards (this portion is the diverted flow). This downward-flowing diverted flow impacts the sealing and wear-resistant structure 5 and is blocked by it, causing it to bend back upwards. During this reversal, the sediment accumulated in the return annular groove 6 is carried away and merges into the main flow, entering the next impeller 4 assembly. This helps prevent sediment overflowing from the return annular groove 6 from causing wear on the inner wall of the guide vane 3 and / or the positioning element 2, thereby improving the service life of the guide vane 3 and / or the positioning element 2.

[0034] In practical applications, the width of the reflux ring groove 6 is 1 mm to 5 mm, and the depth of the reflux ring groove 6 is 1 mm to 3 mm.

[0035] In this technical solution, limiting the specifications of the return annular groove 6 is beneficial for the collection of silt in the return annular groove 6, and ensures that the collected silt can remain in the return annular groove 6 when not subjected to external forces. At the same time, the silt can be driven by the diverted water flow to re-enter the next stage impeller 4 assembly, which can prevent the silt from accumulating and overflowing from the return annular groove 6. Ultimately, the parts where the guide vane 3 and / or positioning element 2 mate with the sealing and wear-resistant structure 5 are minimally subjected to the scouring and friction effects of silt.

[0036] In practical applications, the distance from the top of the reflux annular groove 6 to the corresponding end cap on the impeller 4 is greater than or equal to 2 mm.

[0037] In this technical solution, the location of the return annular groove 6 is not only conducive to temporarily retaining sediment, but also facilitates the diversion flow to carry away the retained sediment in a timely manner, preventing sediment from overflowing from the return annular groove 6.

[0038] In this technical solution, in order to save material and reduce the thickness of the sealing ring 8, the return ring groove 6 is formed by locally thickening the sealing ring 8. The locally thickened part is an integral structure with the sealing ring 8.

[0039] In practical applications, the sealing and wear-resistant structure 5 includes a hard wear-resistant ring 7 and an elastic sealing ring 8 composite on the wear-resistant ring 7. The inner diameter of the sealing ring 8 is larger than the inner diameter of the wear-resistant ring 7, and the outer edge of the sealing ring 8 is clamped by adjacent guide vanes 3 to form a sealing fit.

[0040] In this technical solution, the wear-resistant ring 7 and the impeller 4 work together to improve wear resistance, prevent or reduce the possibility of increased friction gap between the wear-resistant ring 7 and the impeller 4, prevent or reduce the possibility of water leakage, and help ensure hydraulic performance.

[0041] In practical applications, the inner diameter of the wear-resistant ring 7 is greater than or equal to the inner diameter of the mouth ring, and the inner edge of the wear-resistant ring 7 and the mouth ring are axially pressed together.

[0042] In this technical solution, the inner diameter of the wear-resistant ring 7 is not less than the inner diameter of the inlet ring, so as to prevent the wear-resistant ring 7 from extending to the water inlet of the impeller 4. This helps to ensure that the impeller 4 has a sufficiently effective water inlet area to ensure the hydraulic performance and hydraulic efficiency of the water pump.

[0043] In practical applications, the sealing ring 8 includes at least a first sealing ring portion 9, which is disposed on the surface of the wear-resistant ring 7 facing the water inlet end of the impeller 4, and the return ring groove 6 disposed on the outer edge of the sealing wear-resistant structure 5 is disposed on the outer edge of the first sealing ring portion 9.

[0044] In other words, at least on the side of the wear-resistant ring 7 facing the impeller 4, the first sealing ring 9 is composited to achieve the purpose of sealing.

[0045] In practical applications, in order to further improve the sealing performance, the sealing ring also includes a second sealing ring portion 10 and a side ring portion 11. The second sealing ring portion 10 is disposed on the surface of the wear-resistant ring 7 facing away from the water inlet end of the impeller 4, and the side ring portion 11 is disposed on the outer ring surface of the wear-resistant ring 7. The first sealing ring portion 9, the second sealing ring portion 10 and the side ring portion 11 are an integral structure.

[0046] In this technical solution, the sealing ring 8 and the wear-resistant ring 7 can be two independent components, with the sealing ring 8 inserted into the wear-resistant ring 7. Alternatively, the sealing ring 8 can be directly composite-formed onto the wear-resistant ring 7, making the sealing and wear-resistant structure 5 a single component.

[0047] Of course, it is also feasible to have the sealing ring 8 consisting only of the first sealing ring portion 9 and the second sealing ring portion 10, with the first sealing ring portion 9 and the second sealing ring portion 10 respectively disposed on the two surfaces of the wear-resistant ring 7.

[0048] In practical applications, the outer diameter of the wear-resistant ring 7 is larger than the outer diameter of the return ring groove 6, so that there is a certain gap between the return ring groove 6 and the guide vane 3 and / or the positioning element 2, so that the mud and sand avoid the guide vane 3 and / or the positioning element 2 as much as possible and accumulate in the return ring groove 6, preventing the mud and sand from causing wear on the guide vane 3 and / or the positioning element 2.

[0049] In practical applications, the wear-resistant ring 7 is made of stainless steel, ceramic, or a hard material with a wear-resistant coating on its surface, and the sealing ring 8 is made of rubber.

[0050] In practical applications, the guide vane 3 is provided with an assembly stop 12 and an assembly ring 13, and the positioning part 2 is also provided with an assembly stop 12. The assembly stop 12 faces the end of the water inlet of the impeller 4, and the assembly ring 13 faces the water outlet of the impeller 4.

[0051] During assembly, the outer edge of the sealing and wear-resistant structure 5 rests in the assembly stop 12 (which is an annular groove) on the guide vane 3 (or positioning member 2). The assembly ring 13 on the adjacent guide vane 3 is inserted into the assembly stop 12 and presses against the outer edge of the sealing and wear-resistant structure 5, so that the guide vane 3 (or positioning member 2), the sealing and wear-resistant structure 5 and the adjacent guide vane 3 form a sealed fit.

[0052] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Various modifications and variations can be made to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A water pump with a sealed and wear-resistant structure, comprising a pump casing (1), a plurality of impeller (4) assemblies arranged in series on a pump shaft within the pump casing (1), and positioning members (2) disposed at both ends of the pump casing (1), characterized in that... Each impeller (4) assembly includes a guide vane (3), an impeller (4) disposed in the inner cavity of the guide vane (3), and a sealing and wear-resistant structure (5) that cooperates with the water inlet end of the impeller (4). The sealing and wear-resistant structure (5) is annular, and the inner edge of the sealing and wear-resistant structure (5) is a wear-resistant part. The wear-resistant part is axially pressed against the inlet ring of the water inlet end of the impeller (4). The outer edge of the sealing and wear-resistant structure (5) seals the gap between two adjacent guide vanes (3) or the gap between adjacent guide vanes (3) and the positioning member (2).

2. The water pump with a sealed and wear-resistant structure according to claim 1, characterized in that... The sealing and wear-resistant structure (5) is provided with at least one return ring groove (6), the opening of the return ring groove (6) is axially arranged and faces the outlet of the impeller (4).

3. The water pump with a sealed and wear-resistant structure according to claim 2, characterized in that... The width of the reflux ring groove (6) is 1 mm to 5 mm, and the depth of the reflux ring groove (6) is 1 mm to 3 mm.

4. The water pump with a sealed and wear-resistant structure according to claim 2, characterized in that... The distance from the top of the reflux annular groove (6) to the corresponding end cap on the impeller (4) is greater than or equal to 2 mm.

5. The water pump with a sealed wear-resistant structure according to any one of claims 1-4, characterized in that... The sealing and wear-resistant structure (5) includes a hard wear-resistant ring (7) and an elastic sealing ring (8) composite on the wear-resistant ring (7). The inner diameter of the sealing ring (8) is larger than the inner diameter of the wear-resistant ring (7). The adjacent guide vanes (3) clamp the outer edge of the sealing ring (8) to form a sealing fit.

6. The water pump with a sealed and wear-resistant structure according to claim 5, characterized in that... The inner diameter of the wear-resistant ring (7) is greater than or equal to the inner diameter of the mouth ring, and the inner edge of the wear-resistant ring (7) and the mouth ring are axially pressed together.

7. The water pump with a sealed and wear-resistant structure according to claim 5, characterized in that... The sealing ring (8) includes at least a first sealing ring portion (9), which is disposed on the surface of the wear-resistant ring (7) facing the water inlet end of the impeller (4). The return ring groove (6) disposed on the outer edge of the sealing wear-resistant structure (5) is disposed on the outer edge of the first sealing ring portion (9).

8. The water pump with a sealed and wear-resistant structure according to claim 7, characterized in that... The sealing ring (8) further includes a second sealing ring portion (10) and a side ring portion (11). The second sealing ring portion (10) is disposed on the surface of the wear-resistant ring (7) facing away from the water inlet end of the impeller (4). The side ring portion (11) is disposed on the outer ring surface of the wear-resistant ring (7). The first sealing ring portion (9), the second sealing ring portion (10) and the side ring portion (11) are an integral structure.

9. The water pump with a sealed and wear-resistant structure according to claim 8, characterized in that... The outer diameter of the wear-resistant ring (7) is larger than the outer diameter of the return ring groove (6).

10. The water pump with a sealed and wear-resistant structure according to claim 5, characterized in that... The wear-resistant ring (7) is a ring made of stainless steel, ceramic, or a hard material with a wear-resistant coating on its surface.

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