Pump body structure of double-suction axially split centrifugal pump

Abstract

The pump body structure comprises a machine shell, a shaft body and an impeller assembly, the impeller assembly comprises a supporting plate and first blades, the supporting plate is arranged on the shaft body in a sleeved mode, the supporting plate is provided with a through groove, the two sides of the through groove are communicated with a liquid inlet cavity and a liquid feeding cavity respectively, the supporting plate is connected with the shaft body in a clamped mode in the circumferential direction, and the first blades are arranged on the supporting plate. Each first blade is provided with a first bent section, a plane section and a second bent section, the end, close to the shaft body, of each first blade inclines in the forward direction, the first bent sections are bent in the forward direction, and the bending direction of the second bent sections is opposite to the bending direction of the first bent sections. The utility model has the beneficial effects that the driving force for driving the liquid to flow towards the liquid feeding cavity is increased, the conveying flow is improved, and the working performance is better. And the damaged first blade and the damaged second blade can be independently replaced, and the impeller assembly can be conveniently maintained.

Description

Technical Field

[0001] This utility model relates to the technical field of pump body structure, specifically to a pump body structure for a double-suction split-case centrifugal pump. Background Technology

[0002] The impeller of the double-suction split-case centrifugal pump is installed inside the pump casing and fastened to the pump shaft. The pump shaft is directly driven by the motor, causing the impeller to rotate inside the pump casing. The liquid at the impeller rotates with the liquid and tends to flow out of the impeller under centrifugal force, thereby driving the liquid flow and realizing the function of pumping liquid.

[0003] Chinese utility model patent CN204900265U discloses a single-stage double-suction split-case centrifugal pump. The pump body has a centrally symmetrical shape with a pump cover on its upper part. Symmetrical impellers are mounted on the center line of the pump body. Symmetrically arranged double-suction sealing rings are installed between the impellers and the pump body and pump cover. Shaft sleeves are symmetrically mounted on both sides of the impeller shaft. The left shaft sleeve is fixed by a shaft sleeve nut. Mechanical seal positioning rings are installed on both sides of the impeller shaft sleeves. Bearing body B is located at the left end of the shaft, and the two are rotatably connected by bearings. Bearing body A is installed on the right side of the shaft, and the two are rotatably connected by bearings. The pump operates stably, greatly reducing the impact of the medium on the mechanical seal force and extending the mechanical seal's service life. Furthermore, the pump body is integrally cast, providing good rigidity, and the intermediate support structure is stably connected.

[0004] With technological advancements, the performance requirements for centrifugal pumps are constantly increasing. Existing double-suction split-case centrifugal pumps, however, rely solely on the impeller's circumferential rotation of the liquid, utilizing only the liquid's centrifugal force to induce radial flow. This results in limited driving force for radial flow and a relatively small flow rate. Therefore, existing double-suction split-case centrifugal pumps suffer from poor performance. Utility Model Content

[0005] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a pump body structure for a double-suction split-case centrifugal pump, which includes a casing, a shaft, and an impeller assembly. This pump body structure of the double-suction split-case centrifugal pump has the advantage of better working performance.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0007] A pump body structure for a double-suction split-case centrifugal pump includes a casing, a shaft, and an impeller assembly. The shaft passes through the casing, and the impeller assembly is mounted on the shaft. The casing has an inlet chamber and a delivery chamber. The impeller assembly includes a support plate and a first blade. The support plate is sleeved on the shaft and has a through groove. The two sides of the through groove communicate with the inlet chamber and the delivery chamber, respectively. The support plate is circumferentially engaged with the shaft. Two support plates are provided, and each of the two support plates is engaged with both ends of the first blade. The two support plates are symmetrically arranged with the first blade as the center. The first blade has a first curved section, a flat section, and a second curved section. The first curved section is located at the end of the first blade near the shaft, in the positive direction of the shaft's rotation. The end of the first blade near the shaft is inclined in the positive direction. The first curved section is bent in the positive direction. The second curved section bends in the opposite direction to the first curved section. The two ends of the flat section smoothly transition with the first and second curved sections, respectively. The flat section extends radially along the shaft.

[0008] With this configuration, as the first blade rotates with the shaft, the end of the first curved section closest to the shaft tilts in the positive direction. This allows the liquid to flow away from the shaft along the tilt direction of the first curved section during the liquid movement, thereby promoting the liquid to flow away from the shaft, increasing the driving force for the liquid to flow into the delivery chamber, improving the delivery flow rate, and achieving better working performance.

[0009] Preferably, the impeller assembly further includes a second blade, and the two support plates are respectively engaged with the two ends of the second blade.

[0010] This setting enhances the effect of centrifugal force driving movement away from the axis.

[0011] Preferably, the second blade is tilted in the opposite direction to the first blade.

[0012] This design increases the driving force that propels the liquid to flow into the delivery chamber.

[0013] Preferably, multiple first blades and multiple second blades are provided, and the multiple first blades and multiple second blades are evenly distributed around the circumference of the shaft, with the multiple first blades and multiple second blades spaced apart.

[0014] This setting reduces vibration and noise during operation.

[0015] Preferably, the support plate is provided with a second slot that mates with the second blade.

[0016] This configuration allows the support plate to stably drive the second blade to rotate.

[0017] Preferably, the support plate is equipped with a second sealing strip located in the second slot, the second sealing strip abutting against the second blade, and the second blade is located on the positive side of the second sealing sleeve.

[0018] This setup ensures that the liquid can be propelled by the second blade and moved away from the axis.

[0019] Preferably, the support plate is provided with a first slot that mates with the first blade.

[0020] This configuration allows the support plate to stably drive the first blade to rotate.

[0021] Preferably, the support plate is equipped with a first sealing strip located in the first slot, the first sealing strip abutting against the first blade, and the first blade is located on the positive side of the first sealing sleeve.

[0022] This setup ensures that the liquid can be propelled by the first blade and moved away from the axis.

[0023] Preferably, multiple through grooves are provided, and the multiple through grooves are evenly distributed around the shaft as the center. Each of the multiple through grooves corresponds to a multiple first blade. The through grooves are provided with an inclined surface. The first blade is located between the first sealing strip and the inclined surface. The end of the inclined surface near the liquid inlet chamber is inclined in the positive direction.

[0024] This design facilitates the flow of liquid from the inlet chamber to the delivery chamber.

[0025] Preferably, the support plate is fixedly connected to a support sleeve, the support sleeve is sleeved on the shaft, the shaft is equipped with a connecting key, and the end of the support sleeve near the first blade is provided with a keyway that mates with the connecting key.

[0026] This design improves the structural stability between the shaft and the support plate.

[0027] Compared with the prior art, this utility model has achieved beneficial technical effects:

[0028] 1. During the rotation of the first blade with the shaft, the end of the first curved section closest to the shaft is inclined in the positive direction. As the first curved section pushes the liquid to move, the liquid can flow away from the shaft along the inclined direction of the first curved section. This promotes the flow of liquid away from the shaft, increases the driving force for the liquid to flow into the delivery chamber, improves the delivery flow rate, and achieves the advantage of better working performance.

[0029] 2. The pump body structure of this double-suction split-case centrifugal pump allows a support plate to slide off the shaft and loosen the first and second blades when a single blade is damaged. The damaged first and second blades can then be replaced, thus facilitating the maintenance of the impeller assembly. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the pump body structure of a double-suction split-case centrifugal pump according to an embodiment of this utility model;

[0031] Figure 2 This is a schematic diagram of the impeller assembly in an embodiment of the present invention;

[0032] Figure 3 This is an exploded view of the impeller assembly according to an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the casing structure of an embodiment of this utility model.

[0034] The technical features referred to by the various reference numerals in the accompanying drawings are as follows:

[0035] 11. Housing; 12. Liquid inlet chamber; 13. Liquid delivery chamber; 14. Liquid inlet; 15. Liquid delivery port; 21. Shaft; 22. Support sleeve; 23. Connector; 24. Keyway; 31. Support plate; 32. Through groove; 33. Inclined surface; 34. First slot; 35. First sealing strip; 36. Second slot; 37. Second sealing strip; 41. First blade; 42. First curved section; 43. Flat section; 44. Second curved section; 45. Second blade. Detailed Implementation

[0036] To make the objectives, technical solutions and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments. However, the scope of protection of this utility model is not limited to the specific embodiments described below.

[0037] refer to Figure 1-4 A pump body structure for a double-suction split-case centrifugal pump includes a casing 11, a shaft 21, and an impeller assembly.

[0038] A shaft 21 is inserted through a housing 11, and an impeller assembly is mounted on the shaft 21. The housing 11 has a liquid inlet chamber 12 and a liquid delivery chamber 13. The housing 11 has a liquid inlet 14 and a liquid delivery port 15, which are respectively connected to the liquid inlet chamber 12 and the liquid delivery chamber 13. The liquid inlet 14 is connected to an external liquid pipe, thereby enabling liquid to be delivered to the liquid inlet chamber 12.

[0039] The impeller assembly includes a support plate 31, a first blade 41, and a second blade 45. The support plate 31 is sleeved on the shaft 21 and has a through groove 32. The two sides of the through groove 32 are connected to the liquid inlet chamber 12 and the liquid delivery chamber 13, respectively. The support plate 31 is circumferentially engaged with the shaft 21. There are two support plates 31 in total, and each of the two support plates 31 is engaged with both ends of the first blade 41. The two support plates 31 are symmetrically arranged with the first blade 41 as the center. There are multiple through grooves 32, which are evenly distributed circumferentially with the shaft 21 as the center. Each through groove 32 corresponds to a different first blade 41. The through groove 32 has an inclined surface 33. The first blade 41 is located between the first sealing strip 35 and the inclined surface 33. The end of the inclined surface 33 closest to the liquid inlet chamber 12 is inclined in the positive direction. During rotation, the liquid in the channel 32 is pushed by the inclined surface 33 and moves towards the first blade 41 along the inclined direction of the inclined surface 33, thus promoting the flow of liquid from the inlet chamber 12 to the delivery chamber 13. A support sleeve 22 is fixedly connected to the support plate 31 and is fitted onto the shaft 21. The shaft 21 is equipped with a connecting key, and the end of the support sleeve 22 near the first blade 41 has a keyway 24 that mates with the connecting key. The support sleeve 22, fitted onto the shaft 21, enhances the structural stability between the shaft 21 and the support plate 31.

[0040] The support plate 31 is provided with a first groove 34 that mates with the first blade 41. The first groove 34 engages with the first blade 41, allowing the support plate 31 to stably drive the first blade 41 to rotate. A first sealing strip 35 is installed on the support plate 31 within the first groove 34. The first sealing strip 35 abuts against the first blade 41, which is located on the positive side of the first sealing sleeve. The first sealing strip 35 blocks the gap between the first blade 41 and the support plate 31, reducing the amount of liquid flowing through this gap and ensuring that the liquid can be pushed by the first blade 41 and move away from the shaft 21. The first blade 41 is provided with a first curved section 42, a flat section 43, and a second curved section 44. The first curved section 42 is located at the end of the first blade 41 closest to the shaft 21, in the positive direction of the shaft 21's rotation. Figure 2 The first blade 41 is inclined in a clockwise direction at one end near the shaft 21. The first curved section 42 is bent in a positive direction. The second curved section 44 is bent in the opposite direction to the first curved section 42. The two ends of the planar section 43 are smoothly transitioned to the first curved section 42 and the second curved section 44, respectively. The planar section 43 extends radially along the shaft 21.

[0041] Two support plates 31 are respectively engaged with both ends of the second blade 45. The second blade 45 further pushes the liquid to rotate around the shaft 21, increasing the speed of liquid rotation and enhancing the centrifugal force driving the liquid to move away from the shaft 21. The second blade 45 is tilted in the opposite direction to the first blade 41, further pushing the liquid away from the shaft 21 and increasing the driving force for the liquid to flow into the delivery chamber 13. The support plate 31 is provided with a second groove 36 that mates with the second blade 45. The engagement of the second groove 36 with the second blade 45 allows the support plate 31 to stably drive the second blade 45 to rotate. The support plate 31 is equipped with a second sealing strip 37 located in the second groove 36. The second sealing strip 37 abuts against the second blade 45, which is located on the positive side of the second sealing sleeve. By blocking the gap between the second blade 45 and the support plate 31 with the second sealing strip 37, the liquid flowing through the gap between the second blade 45 and the support plate 31 is reduced, ensuring that the liquid can be pushed by the second blade 45 and move away from the shaft 21.

[0042] Multiple first blades 41 and second blades 45 are provided, and the multiple first blades 41 and multiple second blades 45 are evenly distributed around the central circumference of the shaft 21, with the multiple first blades 41 and multiple second blades 45 spaced apart. The spaced arrangement of the first blades 41 and multiple second blades 45 allows the multiple first blades 41 and multiple second blades 45 to push the liquid movement at different positions more evenly, making the impeller assembly drive the liquid movement more smoothly and reducing vibration and noise during operation.

[0043] Specific work process:

[0044] The motor drives the shaft 21 to rotate in the forward direction. The shaft 21 drives the support plate 31 to rotate through the connecting key and keyway 24. The support plate 31 drives the first blade 41 and the second blade 45 to rotate, so that the liquid between the two support plates 31 rotates around the shaft 21 with the first blade 41 and the second blade 45. Thus, through centrifugal force, the liquid flows away from the shaft 21 into the liquid delivery chamber 13. The liquid in the liquid delivery chamber 13 is discharged from the housing 11 through the liquid delivery port 15, thus realizing the function of liquid delivery.

[0045] This embodiment has the following advantages:

[0046] As the first blade 41 rotates with the shaft 21, the end of the first curved section 42 closest to the shaft 21 tilts in the positive direction. This allows the liquid to flow away from the shaft 21 along the tilting direction of the first curved section 42 during the liquid movement. This promotes the liquid to flow away from the shaft 21, increases the driving force for the liquid to flow into the delivery chamber 13, improves the delivery flow rate, and achieves better working performance.

[0047] The first curved segment 42 bends in the forward direction, and the second curved segment 44 bends in the opposite direction to the first curved segment 42, so that the end of the first curved segment 42 near the shaft 21 bends in the opposite direction to the end of the second curved segment 44 away from the shaft 21. The linear velocity of the end of the first curved segment 42 near the shaft 21 is relatively small, and the resistance encountered by the first curved segment 42 in the liquid is small. Therefore, by bending in the forward direction, the first curved segment 42 can contact the liquid at a slower speed, which can effectively drive the liquid away from the shaft 21 while preventing the first blade 41 from having excessive resistance.

[0048] The planar segment 43 is perpendicular to the shaft 21, so that the planar segment 43 pushes the liquid shaft when it rotates, ensuring the speed of liquid rotation and improving the effect of centrifugal force to drive the liquid to move away from the shaft 21.

[0049] The second curved section 44 is located at the edge of the blade, and its linear velocity is relatively high during rotation. Therefore, the end of the second curved section 44 away from the shaft 21 is bent in the opposite direction to reduce the resistance encountered by the second curved section 44 when moving in the liquid. At the same time, the second curved section 44 can further push the liquid to flow away from the shaft 21. Promoting the flow of liquid away from the shaft 21 increases the driving force for the liquid to flow into the delivery chamber 13, improves the delivery flow rate, and achieves the advantage of better working performance.

[0050] During prolonged use, impurities and cavitation in the liquid can damage parts of the impeller in centrifugal pumps. Existing double-suction split-case centrifugal pumps use an integrated impeller; when some blades need replacement, the entire impeller must be replaced, resulting in high maintenance costs. This new double-suction split-case centrifugal pump's pump body structure allows a support plate 31 to slide off the shaft 21 and release the first and second blades 41 and 45 when a single blade is damaged. This allows for easy replacement of the damaged first and second blades 41 and 45, facilitating convenient maintenance of the impeller assembly.

[0051] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the utility model.

Claims

1. A pump body structure for a double-suction split-case centrifugal pump, characterized in that: The assembly includes a housing (11), a shaft (21), and an impeller assembly. The shaft (21) passes through the housing (11), and the impeller assembly is mounted on the shaft (21). The housing (11) has an inlet chamber (12) and a delivery chamber (13). The impeller assembly includes a support plate (31) and a first blade (41). The support plate (31) is sleeved on the shaft (21). The support plate (31) has a through groove (32), and the two sides of the through groove (32) are respectively connected to the inlet chamber (12) and the delivery chamber (13). The support plate (31) is circumferentially engaged with the shaft (21). There are two support plates (31), and the two support plates (31) are respectively engaged with the two ends of the first blade (41). 31) Symmetrically arranged with the first blade (41) as the center, the first blade (41) is provided with a first curved section (42), a planar section (43) and a second curved section (44). The first curved section (42) is located at the end of the first blade (41) near the shaft (21). The shaft (21) rotates in the positive direction. The end of the first blade (41) near the shaft (21) is inclined in the positive direction. The first curved section (42) bends in the positive direction. The second curved section (44) bends in the opposite direction to the first curved section (42). The two ends of the planar section (43) smoothly transition with the first curved section (42) and the second curved section (44) respectively. The planar section (43) extends radially along the shaft (21).

2. The pump body structure of the double-suction split-case centrifugal pump according to claim 1, characterized in that: The impeller assembly also includes a second blade (45), and the two support plates (31) are respectively engaged with the two ends of the second blade (45).

3. The pump body structure of the double-suction split-case centrifugal pump according to claim 2, characterized in that: The second blade (45) is tilted in the opposite direction to the first blade (41).

4. The pump body structure of the double-suction split-case centrifugal pump according to claim 3, characterized in that: Multiple first blades (41) and multiple second blades (45) are provided. Multiple first blades (41) and multiple second blades (45) are evenly distributed around the shaft (21) as the center. Multiple first blades (41) and multiple second blades (45) are arranged at intervals.

5. The pump body structure of the double-suction split-case centrifugal pump according to claim 3, characterized in that: The support plate (31) is provided with a second slot (36) that mates with the second blade (45).

6. The pump body structure of the double-suction split-case centrifugal pump according to claim 5, characterized in that: The support plate (31) is equipped with a second sealing strip (37) located in the second slot (36). The second sealing strip (37) abuts against the second blade (45), and the second blade (45) is located on the positive side of the second sealing sleeve.

7. The pump body structure of the double-suction split-case centrifugal pump according to claim 1, characterized in that: The support plate (31) is provided with a first slot (34) that mates with the first blade (41).

8. The pump body structure of the double-suction split-case centrifugal pump according to claim 7, characterized in that: The support plate (31) is equipped with a first sealing strip (35) located in the first slot (34), the first sealing strip (35) abuts against the first blade (41), and the first blade (41) is located on the positive side of the first sealing sleeve.

9. The pump body structure of the double-suction split-case centrifugal pump according to claim 8, characterized in that: Multiple through grooves (32) are provided. The multiple through grooves (32) are evenly distributed around the shaft (21) as the center. The multiple through grooves (32) correspond one-to-one with multiple first blades (41). The through grooves (32) are provided with inclined surfaces (33). The first blades (41) are located between the first sealing strip (35) and the inclined surfaces (33). The inclined surfaces (33) are inclined in the positive direction at the end near the liquid inlet chamber (12).

10. The pump body structure of the double-suction split-case centrifugal pump according to claim 1, characterized in that: The support plate (31) is fixedly connected to a support sleeve (22), which is sleeved on the shaft (21). The shaft (21) is equipped with a connecting key, and the end of the support sleeve (22) near the first blade (41) is provided with a keyway (24) that cooperates with the connecting key.

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