Water inlet expansion joint structure of vertical mixed-flow pump

Abstract

A water inlet expansion joint structure of a vertical mixed-flow pump comprises a concrete water inlet flow channel, an expansion joint embedded seat is arranged on the concrete water inlet flow channel, an expansion joint inner pipe is arranged on the expansion joint embedded seat, an impeller chamber and a guide vane body are sequentially connected to the upper portion of the expansion joint inner pipe, an impeller component and a pump shaft are arranged in the impeller chamber, and the impeller component is installed on the pump shaft. A lower connecting flange is machined at the bottom of the telescopic joint inner pipe, first connecting holes and second connecting holes are evenly distributed in the periphery of the lower connecting flange, ejection bolts are arranged in the first connecting holes, draw-in bolts are arranged in the second connecting holes, a telescopic joint outer ring is arranged on an outer ring of the lower connecting flange, the telescopic joint outer ring is connected with a telescopic joint embedded base, and the telescopic joint embedded base is connected with the telescopic joint inner pipe. A sealing groove is formed between the expansion joint outer ring and the lower connecting flange, sealing filler is arranged in the sealing groove, a sealing pressing ring is arranged above the sealing groove, and the sealing filler is pressed by the sealing pressing ring. The telescopic joint inner pipe can be integrally moved out, and maintenance of impeller parts is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of water pump technology, specifically to a vertical mixed-flow pump inlet expansion joint structure. Background Technology

[0002] like Figure 4 The diagram shows the structure of an existing vertical mixed-flow pump where the inlet side connects to the expansion joint. It includes an expansion joint embedded seat 100, sealing filler 200, sealing pressure ring 300, sealing set bolt 400, expansion joint inner tube 500, impeller chamber 600, concrete inlet channel 700, expansion joint impeller chamber connecting bolt 800, impeller assembly 900, guide vane body 1000, pump shaft impeller assembly connecting bolt 1100, and pump shaft 1200. The expansion joint embedded seat 100 is embedded in the concrete inlet channel 700. Tightening the sealing set bolt 400 causes the sealing pressure ring 300 to press the sealing filler 200 against the outer diameter φD of the expansion joint inner tube 500, thus achieving a seal between the expansion joint and the inlet channel.

[0003] During pump installation, the inner tube 500 of the expansion joint and the impeller chamber 600 are lowered by H1 and placed on the sealing set bolt 400. The pump shaft and impeller assembly connecting bolt 1100 is tightened. Then, the pump shaft 1200 and the impeller assembly 900 are moved upward to the designed position. The inner tube 500 of the expansion joint and the impeller chamber 600 are then moved upward by H1 and fixed to the guide vane body 1000 with bolts. During pump disassembly, the inner tube 500 of the expansion joint and the impeller chamber 600 are lowered by H1 and placed on the sealing set bolt 400. The impeller chamber 600 is removed. The impeller assembly 900 is lowered, the pump shaft and impeller assembly connecting bolt 1100 is loosened, and the impeller assembly 900 is removed.

[0004] However, the existing vertical mixed-flow pump's inlet side connection to the expansion joint has the following defects: 1. The inner tube 500 of the expansion joint lacks supporting ribs, and the outer circle φD is prone to deformation, affecting installation and sealing; 2. The inner tube 500, impeller chamber 600, and guide vane 1000 of the expansion joint are in a suspended state, and the pump inlet end is not rigidly fixed to the concrete foundation, which will aggravate pump casing swaying and vibration; 3. As cement and sand accumulate in the pump inlet, the suction conditions deteriorate. In order to submerge the impeller component 900 as deeply as possible in the water, improve the pump's cavitation performance, and reduce the amount of excavation for the pumping station, the downward displacement H1 of the inner tube 500 of the expansion joint will be smaller than the downward displacement H2 of the impeller component, resulting in no space for the pump shaft impeller component connecting bolt 1100 to be installed; 4. If the height H1 is much smaller than H2, the impeller component 900 will be unable to be removed, making maintenance difficult. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a vertical mixed flow pump inlet expansion joint structure to address the shortcomings of the prior art.

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

[0007] A vertical mixed-flow pump inlet expansion joint structure includes a concrete inlet channel, an expansion joint pre-embedded seat on the concrete inlet channel, an expansion joint inner tube on the expansion joint pre-embedded seat, an impeller chamber and a guide vane body connected sequentially above the expansion joint inner tube, an impeller component and a pump shaft installed in the impeller chamber, the impeller component mounted on the pump shaft, a lower connecting flange machined at the bottom of the expansion joint inner tube, a first connecting hole and a second connecting hole evenly distributed around the periphery of the lower connecting flange, a push-opening bolt installed in the first connecting hole and a tensioning bolt installed in the second connecting hole, an expansion joint outer ring installed on the outer ring of the lower connecting flange, the expansion joint outer ring connected to the expansion joint pre-embedded seat, a sealing groove provided between the expansion joint outer ring and the lower connecting flange, a sealing filler provided in the sealing groove, a sealing pressure ring provided above the sealing groove, and the periphery of the sealing pressure ring fixed on the expansion joint outer ring to press down the sealing filler.

[0008] Furthermore, the first connecting hole is a threaded hole, and the jacking bolt is screwed into the first connecting hole. The expansion joint pre-embedded seat is machined with a jacking groove, and the threaded end of the jacking bolt is stuck in the jacking groove.

[0009] Furthermore, the second connecting hole is a through hole, and the expansion joint pre-embedded seat is machined with a threaded mounting hole, through which the threaded end of the tension bolt passes and connects with the threaded mounting hole.

[0010] Furthermore, both the jacking bolt and the tensioning bolt are equipped with locking nuts and washers.

[0011] Furthermore, the upper end of the inner tube of the expansion joint is machined with an upper connecting flange, which is connected to the impeller chamber, and several reinforcing ribs are connected between the upper connecting flange and the lower connecting flange.

[0012] Compared with the prior art, the vertical mixed-flow pump inlet expansion joint structure of this utility model has the following beneficial effects:

[0013] 1. The inner tube, outer ring, and pressure ring of the expansion joint can be moved to the designated position after the water pump is installed. The inner tube of the expansion joint is suspended and spaced 5mm to 10mm from the pre-embedded seat of the expansion joint, which is convenient for installation. In addition, this structure provides sufficient space for the installation of the impeller components.

[0014] 2. The inner tube of the expansion joint is changed to a structure with flanges on the top and bottom, and stiffening plates are used to reinforce the flanges. The inner tube of the expansion joint has sufficient rigidity and small deformation, ensuring reliable sealing of the sealing filler.

[0015] 3. Tighten the bolt group and open the bolt group to rigidly connect the inner tube of the expansion joint to the pre-embedded seat of the expansion joint, ensuring that the water pump inlet end is rigidly connected to the concrete water inlet channel, preventing the water pump from swaying during operation and reducing pump head vibration. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3 yes Figure 2 Enlarged view of point B in the middle;

[0019] Figure 4 This is a schematic diagram of the original expansion joint inner tube installation structure;

[0020] The components are as follows: 1. Concrete inlet channel; 2. Expansion joint embedded seat; 3. Expansion joint inner tube; 4. Impeller chamber; 5. Guide vane body; 6. Impeller assembly; 7. Pump shaft; 8. Pump shaft impeller assembly connecting bolts; 9. Lower connecting flange; 10. Top opening bolt; 11. Tension bolt; 12. Top opening groove; 13. Locking nut; 14. Gasket; 15. Expansion joint outer ring; 16. Bolt; 17. Sealing ring; 18. Sealing filler; 19. Sealing pressure ring; 20. Sealing set bolt; 21. Upper connecting flange; 22. Reinforcing rib plate. Detailed Implementation

[0021] The technical solutions in the embodiments of this utility model will be clearly and completely described below.

[0022] like Figures 1-3As shown, a vertical mixed-flow pump inlet expansion joint structure includes a concrete inlet channel 1, an expansion joint pre-embedded seat 2 embedded in the concrete inlet channel 1, an expansion joint inner tube 3 installed on the expansion joint pre-embedded seat 2, an impeller chamber 4 and a guide vane body 5 connected sequentially above the expansion joint inner tube 3, an impeller component 6 and a pump shaft 7 installed inside the impeller chamber 4, the impeller component 6 being installed on the pump shaft 7 via pump shaft impeller component connecting bolts 8, a lower connecting flange 9 machined at the bottom of the expansion joint inner tube 3, and connecting holes one and two evenly distributed around the perimeter of the lower connecting flange 9, with a push-opening bolt installed in the first connecting hole. 10. A tensioning bolt 11 is provided in the second connecting hole. In this embodiment, the first connecting hole is a threaded hole. The opening bolt 10 is screwed into the first connecting hole. The expansion joint pre-embedded seat 2 is machined with an opening groove 12. The threaded end of the opening bolt 10 is stuck in the opening groove 12, so that the inner tube 3 of the expansion joint is suspended and there is a gap between it and the expansion joint pre-embedded seat 2. The second connecting hole is a through hole. The expansion joint pre-embedded seat 2 is machined with a threaded mounting hole. The threaded end of the tensioning bolt 11 passes through the second connecting hole and connects with the threaded mounting hole, so that the inner tube 3 of the expansion joint and the expansion joint pre-embedded seat 2 are rigidly connected.

[0023] Both the jacking bolt 10 and the tensioning bolt 11 are equipped with locking nuts 13 and washers 14. The jacking bolt 10 and the tensioning bolt 11 are locked by the locking nuts 13 after being turned.

[0024] An expansion joint outer ring 15 is provided on the outer ring of the lower connecting flange 9. The expansion joint outer ring 15 is connected to the expansion joint pre-embedded seat 2 by bolts 16. A sealing ring 17 is provided between the expansion joint outer ring 15 and the expansion joint pre-embedded seat 2. A sealing groove is provided between the expansion joint outer ring 15 and the lower connecting flange 9. A sealing filler 18 is provided in the sealing groove. A sealing pressure ring 19 is provided above the sealing groove. The periphery of the sealing pressure ring 19 is fixed to the expansion joint outer ring 15 by sealing set bolts 20 to press down the sealing filler 18.

[0025] The upper end of the inner tube 3 of the expansion joint is machined with an upper connecting flange 21. The impeller chamber 4 and the guide vane body 5 are also machined with flanges at both ends. The upper connecting flange 21 is connected to the flange of the impeller chamber 4. The flange at the upper end of the impeller chamber is connected to the flange at the lower end of the guide vane body. Several reinforcing ribs 22 are connected between the upper connecting flange 21 and the lower connecting flange 9. The reinforcing ribs 22 improve the rigidity of the inner tube 3 of the expansion joint.

[0026] During the installation of the water pump, connect the impeller assembly 6 to the pump and pull it up to the designated position. Connect the impeller chamber 4 to the guide vane body 5 with bolts. Assemble the expansion joint outer ring 15, bolts 16, sealing filler 18, sealing pressure ring 19, sealing set bolt 20, and expansion joint inner tube 3 as a whole and move them in. Tighten the connecting bolts, bolts 16, jacking bolts 10, tensioning bolts 11, and sealing set bolts 20 between the expansion joint inner tube 3 and the impeller chamber 4.

[0027] Tightening the jacking bolt 10 ensures that the inner tube 3 of the expansion joint is suspended and the gap between it and the pre-embedded seat 2 of the expansion joint is controlled at 5mm to 10mm. This keeps the inner tube 3, impeller chamber 4, and guide vane body 5 in a compressed state to counteract the tensile deformation of the parts caused by gravity. Tightening the tension bolt 11 rigidly connects the inner tube 3 of the expansion joint to the pre-embedded seat 2 of the expansion joint. Tightening the sealing set bolt 20 compresses the sealing filler 18 with the sealing ring 19 and holds it on the outer circle of the flange of the inner tube 3 of the expansion joint, thus achieving the sealing between the expansion joint and the water inlet channel, as well as the rigid connection between the pump head and the water inlet channel.

[0028] During the disassembly of the water pump, loosen the connecting bolts between the inner tube 3 of the expansion joint and the impeller chamber 4, the tension bolt 11, the jacking bolt 10, and the bolt 16. Remove the outer ring 15 of the expansion joint, the bolt 16, the sealing filler 20, the sealing pressure ring 19, the sealing set bolt 20, and the inner tube 3 of the expansion joint as a whole. Remove the impeller chamber 4, loosen the connecting bolts of the pump shaft and impeller components, and remove the impeller component 6.

[0029] This utility model is not limited to the embodiments described. Those skilled in the art can still make some modifications or changes without departing from the spirit and scope of this utility model. Therefore, the scope of protection of this utility model shall be determined by the scope defined in the claims.

Claims

1. A vertical mixed-flow pump inlet expansion joint structure, comprising a concrete inlet channel, an expansion joint pre-embedded seat provided on the concrete inlet channel, an expansion joint inner pipe provided on the expansion joint pre-embedded seat, an impeller chamber and a guide vane body sequentially connected above the expansion joint inner pipe, an impeller assembly and a pump shaft provided in the impeller chamber, the impeller assembly being mounted on the pump shaft, characterized in that: The bottom of the inner tube of the expansion joint is machined with a lower connecting flange. The lower connecting flange has two connecting holes evenly distributed around its perimeter. A jacking bolt is installed in the first connecting hole, and a tensioning bolt is installed in the second connecting hole. An expansion joint outer ring is installed on the outer ring of the lower connecting flange. The expansion joint outer ring is connected to the expansion joint embedded seat. A sealing groove is provided between the expansion joint outer ring and the lower connecting flange. A sealing filler is provided in the sealing groove. A sealing pressure ring is provided above the sealing groove. The periphery of the sealing pressure ring is fixed on the expansion joint outer ring to press down the sealing filler.

2. The vertical mixed-flow pump inlet expansion joint structure according to claim 1, characterized in that: The first connecting hole is a threaded hole, and the jacking bolt is screwed into the first connecting hole. The expansion joint pre-embedded seat has a jacking groove, and the threaded end of the jacking bolt is stuck in the jacking groove.

3. The vertical mixed-flow pump inlet expansion joint structure according to claim 1, characterized in that: The second connecting hole is a through hole, and the expansion joint pre-embedded seat is machined with a threaded mounting hole. The threaded end of the tension bolt passes through the second connecting hole and connects with the threaded mounting hole.

4. The vertical mixed-flow pump inlet expansion joint structure according to claim 1, characterized in that: Both the jacking bolt and the tensioning bolt are equipped with locking nuts and washers.

5. The structure of the inlet expansion joint of a vertical mixed-flow pump according to claim 1, characterized in that: The upper end of the inner tube of the expansion joint is machined with an upper connecting flange, which is connected to the impeller chamber. Several reinforcing ribs are connected between the upper connecting flange and the lower connecting flange.

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