Single-stage axially split pump with guide vane device

Abstract

The invention belongs to the technical field of axially split pumps, particularly relates to a single-stage axially split pump with a guide vane device, and provides the following scheme that the single-stage axially split pump comprises a pump body, a main shaft, a single-suction impeller, two bearing bodies arranged on the two sides of the pump body and two bearing glands detachably mounted on one sides of the bearing bodies; the main shaft penetrates through the two sides of the pump body and is coaxially connected with the single-suction impeller, the two ends of the main shaft are arranged in the two bearing bodies in a sleeved mode respectively, a guide vane assembly is detachably installed in a cavity of the pump body, and the single-suction impeller is coaxially arranged in the guide vane assembly. A fluid kit including the single suction impeller and the guide vane assembly is replaced. The detachable guide vane assembly is introduced and is modularly combined with the single-suction impellers of different specifications to form a series of interchangeable fluid suites, and a user can select and replace the corresponding suites according to actual flow requirements without changing the basic structure of the pump.

Description

Technical Field

[0001] This invention relates to the field of split-case pumps, and more particularly to a single-stage split-case pump with a guide vane device. Background Technology

[0002] Split-case pumps have advantages over ordinary centrifugal pumps, such as longer service life, reasonable structure, and convenient installation and maintenance. In particular, single-stage double-suction split-case pumps have unique advantages such as large flow rate and high cavitation resistance, so their application is quite widespread.

[0003] A search revealed Chinese patent application CN119353138A, which discloses a radially split single-stage double-support hydraulic turbine with variable guide vanes, comprising a housing, a pump cover, an impeller, a main shaft, a bearing housing, and a guide vane assembly. The housing forms an inlet channel; the pump cover is detachably connected to the housing and forms a receiving cavity; the impeller is disposed within the receiving cavity and can rotate within it; the main shaft is coaxially connected to the impeller and passes through the housing and the pump cover; the bearing housing is coaxially fitted at both ends of the main shaft and supports it; the guide vane assembly is disposed within the receiving cavity and detachably connected to the housing, and the guide vane assembly also forms multiple guide vanes concentrically arranged around the impeller, with equal intervals between the guide vanes; the inlet channel is connected to the impeller's inlet through the intervals between adjacent guide vanes.

[0004] When the flow rate of existing single-stage split-case pumps increases to a certain extent during operation, the pump is usually modified to adapt to the large flow rate. This not only greatly increases the user's equipment investment and inventory costs, but also leads to a decrease in the pump's operating efficiency under different operating conditions. Summary of the Invention

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A single-stage split-case pump with a guide vane device includes a pump body, a main shaft, a single-suction impeller, two bearing housings disposed on both sides of the pump body, and two bearing caps detachably installed on one side of the bearing housings. The pump body has an internal chamber. The main shaft passes through both sides of the pump body and is coaxially connected to the single-suction impeller. Both ends of the main shaft are respectively fitted into the two bearing housings. A guide vane assembly is detachably installed within the chamber of the pump body, and the single-suction impeller is coaxially disposed inside the guide vane assembly. The rated flow rate of the pump can be changed by replacing the fluid assembly, including the single-suction impeller and the guide vane assembly. The outer diameter and inlet size of the single-suction impeller in the high-flow-rate assembly are larger than those of the single-suction impeller in the low-flow-rate assembly.

[0006] Preferably, the guide vane assembly includes two guide vane covers and a plurality of guide vanes fixed therebetween, wherein the guide vanes are arc-shaped blades or wavy blades.

[0007] Preferably, a sealing body is further provided in the cavity of the pump body, and a first O-ring is provided between the sealing body and the pump body cavity, and the sealing body is positioned by a second cylindrical pin; the main shaft passes through the sealing body and rotates with it.

[0008] Preferably, a transmission-side bushing is provided between the sealing body and the main shaft; a packing gland is detachably installed on one side of the sealing body, and a packing box bushing, a packing gasket ring, a packing ring, and packing filling between the packing ring and the packing box bushing are sequentially provided on this side, forming a packing seal structure.

[0009] Preferably, the pump body has a pump body sealing ring on the inner wall of the pump body, and a second O-ring is provided between the single-suction impeller and the main shaft; the pump body chamber and the single-suction impeller are connected by a first cylindrical pin for unique circumferential position constraint and torque transmission.

[0010] Preferably, the main shaft is connected to the single-suction impeller via a second connecting key.

[0011] Preferably, a third O-ring is provided between the main shaft and the pump body chamber, and V-rings are provided on both sides of the pump body.

[0012] Preferably, a deep groove ball bearing is provided between the bearing body and the bearing cap, and the main shaft is connected to the deep groove ball bearing by a key; a first washer is provided on one side of the deep groove ball bearing, and a slotted round nut, a locking washer and a disc spring are provided at the end of the main shaft, and axial locking is achieved by the slotted round nut, the locking washer and the disc spring.

[0013] Preferably, the outer wall of the spindle is provided with a first spindle sealing ring and a second spindle sealing ring; the deep groove ball bearing is axially positioned on both sides by elastic retaining rings and second washers.

[0014] The beneficial effects of this invention are as follows: This invention introduces detachable guide vane assemblies and modularly combines them with single-suction impellers of different specifications to form a series of interchangeable fluid kits. Users can select and replace the corresponding kits according to actual flow requirements without modifying the pump's basic structure. This approach greatly expands the application range of a single pump, reduces users' equipment investment and inventory costs, and ensures the pump's operating efficiency and reliability under different working conditions. For example, by changing the kits, the pump's rated flow rate can be flexibly adjusted from 1600 cubic meters per minute to 2800 cubic meters per minute, adapting to more diverse industrial application scenarios. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a single-stage split-case pump with a guide vane device proposed in this invention; Figure 2 for Figure 1The structural diagram at point A is presented in the text; Figure 3 This is a schematic diagram of the guide vane assembly structure of a single-stage split-case pump with a guide vane device proposed in this invention. Figure 4 This is a cross-sectional view of the guide vane assembly in Example 1; Figure 5 This is a cross-sectional view of the guide vane assembly in Example 2.

[0016] In the attached diagram: 1. Bearing body; 2. First gasket; 3. End cover; 4. Locking washer; 5. Slotted round nut; 6. Disc spring; 7. Deep groove ball bearing; 8. Bearing gland; 9. Seal body; 10. First O-ring; 11. Pump body; 12. Pump body sealing ring; 13. Single suction impeller; 14. Guide vane assembly; 15. Second O-ring; 16. Drive side bushing; 17. Packing ring; 18. Packing ring; 19. Packing; 2 0. Stuffing box bushing; 21. Main shaft; 22. First connecting key; 23. Stuffing gland; 24. Second connecting key; 25. First cylindrical pin; 26. Second cylindrical pin; 27. Third O-ring; 28. V-ring; 29. ​​First main shaft seal ring; 30. Elastic retaining ring; 31. Second gasket; 32. Second main shaft seal ring; 33. First guide vane cover; 34. First guide vane; 35. Second guide vane cover; 36. Second guide vane. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, and do not 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 on the scope of protection of the present utility model.

[0018] Example 1, referring to Figures 1-4A single-stage split-case pump with guide vane device includes a pump body 11, a main shaft 21, a single-suction impeller 13, two bearing bodies 1, and two bearing caps 8. The pump body 11 adopts a split-case structure, forming a fluid chamber inside. The main shaft 21 horizontally passes through both sides of the pump body 11, and its two ends are supported by bearing assemblies. Specifically, a bearing body 1 is installed on each side of the pump body 11. The bearing caps 8 are detachably installed on the outside of the bearing body 1 by hexagonal head bolts. The bearing body 1 and the bearing caps 8 together form a mounting cavity, in which a deep groove ball bearing 7 is embedded. The end of the main shaft 21 is connected to the inner ring of the deep groove ball bearing 7 by a key. To ensure precise axial positioning and preload of the bearing, a first washer 2 is provided on one side of the deep groove ball bearing 7. A disc spring 6 and a locking washer 4 are sequentially fitted onto the end of the spindle 21, and finally locked with a slotted round nut 5. The disc spring 6 provides a constant elastic preload force, which can effectively compensate for clearance changes caused by wear and thermal expansion of parts and improve operational stability. Furthermore, a first spindle seal ring 29 and a second spindle seal ring 32 are provided in the section where the spindle 21 mates with the bearing to prevent lubricating grease leakage. The two sides of the deep groove ball bearing 7 are also axially limited by elastic retaining rings 30 and second washer 31.

[0019] Based on the above, the single-suction impeller 13 is installed inside the chamber of the pump body 11 and coaxially connected to the main shaft 21 via the second connecting key 24. It rotates together with the main shaft 21 to perform work on the fluid. In order to seal the gap between the impeller and the shaft, a second O-ring 15 is provided at the mating point between the single-suction impeller 13 and the main shaft 21. A pump body sealing ring 12 is installed on the inner wall of the chamber of the pump body 11, forming a small gap seal with the outer edge of the impeller inlet to reduce internal leakage of high-pressure fluid. A first cylindrical pin 25 is provided between the chamber of the pump body 11 and the single-suction impeller 13. The first cylindrical pin 25 realizes the unique positional constraint of the two in the circumferential direction, ensuring that there will be no misalignment during assembly. More importantly, it provides shear and torsional constraints between the mating surfaces, which can share and transmit part of the torque, reduce the risk of relying solely on the second connecting key 24 for support, reduce fretting wear and loosening caused by torque fluctuations during operation, and significantly improve the rigidity, reliability and vibration resistance of the connection.

[0020] Specifically, a guide vane assembly 14 is detachably installed in the chamber of the pump body 11. The single suction impeller 13 is coaxially arranged inside the guide vane assembly 14. The guide vane assembly 14 is an independent functional module and can be fixed in the pump body 11 by connecting parts such as hexagonal head bolts. In this embodiment, the guide vane assembly 14 consists of two first guide vane covers 33 and a plurality of first guide vanes 34 evenly distributed in a ring. The plurality of first guide vanes 34 are welded or fixed between the two first guide vane covers 33 by other means. The shape of the first guide vanes 34 is an arc shape adapted to a streamlined shape.

[0021] Specifically, in order to effectively seal the high-pressure area where the main shaft 21 passes through the pump body 11, a sealing body 9 is provided in the chamber of the pump body 11 on both sides of the guide vane assembly 14. The sealing body 9 and the chamber of the pump body 11 are statically sealed by a first O-ring 10 and precisely positioned by a second cylindrical pin 26 to prevent circumferential rotation. The main shaft 21 passes through the central hole of the sealing body 9. Inside the sealing body 9, a transmission side bushing 16 is fitted on the main shaft 21 to protect it. On the side of the sealing body 9 facing outward from the pump body 11, a packing sealing mechanism is installed, which includes a removable packing gland 23, a packing box bushing 20, and a packing gasket 17, a packing ring 18, and packing 19 filled therein, arranged sequentially between the sealing body 9 and the main shaft 21. This structure allows the packing to be adjusted or replaced without stopping the machine or during simple maintenance, ensuring the sealing effect.

[0022] In addition, a third O-ring 27 is provided at the junction of the main shaft 21 and the pump body 11 for auxiliary sealing, and V-rings 28 are installed on the end faces of both sides of the pump body 11, which together form multiple sealing lines to ensure no leakage.

[0023] The working principle and modular replacement process of this embodiment are as follows: As a basic model, the pump's single-suction impeller 13 is designed for a rated flow of 1600 cubic meters per minute. When it is necessary to significantly increase the pump's rated flow to 2800 cubic meters per minute while keeping the head at approximately 250 meters, there is no need to replace the entire pump body 11, main shaft 21, bearing housing 1, and other large structural components.

[0024] Install the new fluid kit: Place the new high-flow kit into the pump body chamber 11. The high-flow kit includes a new single-suction impeller 13 with a larger outer diameter and larger suction inlet size, and a new guide vane assembly 14 that is hydraulically matched to it. The new guide vane assembly 14 acts as a "flow diffuser" with a larger flow channel size, which can effectively guide and convert the high-speed fluid flowing out from the large impeller, compensate for the hydraulic difference caused by the increased impeller size, and ensure that the pump efficiency and hydraulic performance remain stable when the flow rate increases significantly, and the head remains at the target value. Since the core structure such as the pump body, main shaft, and bearing housing remains unchanged, only the internal fluid components are replaced. Therefore, the reconfiguration accuracy is high and the versatility is strong. After the replacement, the power of the drive motor needs to be increased accordingly to adapt to the larger flow rate and shaft power.

[0025] Example 2, refer to Figures 1-3 and Figure 5A single-stage split-case pump with guide vane device, compared with Embodiment 1, the guide vane assembly 14 is composed of two second guide vane covers 35 and multiple second guide vanes 36. The multiple second guide vanes 36 are also uniformly fixed in a ring between the two second guide vane covers 35, and their shape is set as wave-shaped. This wave-shaped guide vane design can further optimize the fluid flow state and may be suitable for application scenarios with higher requirements for pressure pulsation, vibration or specific flow-head curves. Like Embodiment 1, the guide vane assembly 14 is also a detachable module and can be combined with single suction impellers 13 of different specifications to form different fluid kit options.

[0026] In summary, this invention introduces a detachable guide vane assembly 14 and modularly combines it with single-suction impellers 13 of different specifications to form a series of interchangeable fluid kits. Users can select and replace the corresponding kits according to actual flow requirements without modifying the pump's basic structure. This approach greatly expands the application range of a single pump, reduces users' equipment investment and inventory costs, and ensures the pump's operating efficiency and reliability under different working conditions. For example, by changing the kits, the pump's rated flow rate can be flexibly adjusted from 1600 cubic meters per minute to 2800 cubic meters per minute, adapting to more diverse industrial application scenarios.

[0027] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A single-stage split-case pump with guide vane device, comprising a pump body (11), a main shaft (21), a single suction impeller (13), two bearing bodies (1) arranged on both sides of the pump body (11), and two bearing pressure covers (8) detachably mounted on one side of the bearing bodies (1), wherein a cavity is arranged in the pump body (11), the main shaft (21) penetrates through both sides of the pump body (11) and is coaxially connected with the single suction impeller (13), and both ends of the main shaft (21) are sleeved in the two bearing bodies (1), characterized in that, The pump body (11) is detachably mounted with a guide vane assembly (14) in the chamber, and the single suction impeller (13) is coaxially arranged in the guide vane assembly (14); the rated flow of the pump is changed by replacing the fluid kit including the single suction impeller (13) and the guide vane assembly (14), wherein the outer diameter and the suction inlet size of the single suction impeller (13) in the large flow kit are larger than those of the single suction impeller (13) in the small flow kit.

2. A single stage, center-primarily based pump with a guide vane device according to claim 1, characterized in that, The guide vane assembly (14) includes two guide vane covers and a plurality of guide vanes fixed therebetween, and the guide vanes are arc-shaped blades or wavy blades.

3. A single stage, center-primarily based pump with a guide vane device according to claim 1, characterized in that, The pump body (11) is further provided with a sealing body (9) in the chamber, a first O-ring (10) is arranged between the sealing body (9) and the chamber of the pump body (11), and the sealing body (9) is positioned by a second cylindrical pin (26); the main shaft (21) penetrates the sealing body (9) and is rotationally matched with the sealing body (9).

4. A single stage, center-primarily based pump with a guide vane device according to claim 3, characterized in that, A transmission side shaft sleeve (16) is arranged between the sealing body (9) and the main shaft (21); a packing gland (23) is detachably mounted on one side of the sealing body (9), and the side is further provided with a packing box bushing (20), a packing gasket (17), a packing ring (18), and a packing (19) filled between the packing ring (18) and the packing box bushing (20) in sequence, thereby forming a packing seal structure.

5. A single stage, center-primarily based pump with a guide vane device according to claim 1, characterized in that, A pump body sealing ring (12) is arranged on the inner wall of the chamber of the pump body (11), and a second O-ring (15) is arranged between the single suction impeller (13) and the main shaft (21); the chamber of the pump body (11) and the single suction impeller (13) are only positionally constrained and torque is transmitted in the circumferential direction by a first cylindrical pin (25).

6. A single stage, center-primarily, pump with a guide vane device according to claim 5, characterized in that, The main shaft (21) is connected with the single suction impeller (13) by a second connecting key (24).

7. A single stage, center-primarily pumping device with a vane apparatus as defined in claim 1, wherein, A third O-ring (27) is arranged between the main shaft (21) and the chamber of the pump body (11), and V-rings (28) are arranged on both sides of the pump body (11).

8. A single stage, center-primarily pumping having a guide vane device according to claim 1, characterized in that, A deep groove ball bearing (7) is arranged between the bearing body (1) and the bearing gland (8), and the main shaft (21) is connected with the deep groove ball bearing (7) by a key; a first gasket (2) is arranged on one side of the deep groove ball bearing (7), and a slotted round nut (5), a locking washer (4), and a disc spring (6) are arranged on the end of the main shaft (21) and axially locked by the slotted round nut (5), the locking washer (4), and the disc spring (6).

9. A single stage, center-primarily pumping having a guide vane device according to claim 1, characterized in that, First and second main shaft sealing rings (29) and (32) are arranged on the outer wall of the main shaft (21); the deep groove ball bearing (7) is axially positioned by elastic retainer rings (30) and a second gasket (31) on both sides.

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