Rotor body structure of self-balancing horizontal split multi-stage pump

Abstract

A self-balancing horizontal type split multistage pump rotor body structure comprises a pump shaft, two first-stage impellers and a last-stage impeller are arranged on the pump shaft, inter-stage shaft sleeves are arranged between the first-stage impellers and the last-stage impeller, and a driving end locking nut and a non-driving end locking nut are arranged on the two sides of the pump shaft. A shaft sleeve is arranged between the driving end locking nut and the first-stage impeller and between the non-driving end locking nut and the first-stage impeller, a sealing ring groove is machined in one end of the shaft sleeve, a first sealing ring is arranged in the sealing ring groove, pressing spigots are machined in the end of the driving end locking nut and the end of the non-driving end locking nut, and the pressing spigots press the first sealing ring. The shaft sleeve, the first-stage impeller, the inter-stage shaft sleeve and the last-stage impeller are connected with one another through positioning spigots, and second sealing rings are arranged at the positioning spigots. According to the utility model, the spacer-sleeve-free axial sealing is realized, meanwhile, the abrasion caused by fine sand entering the surface of the pump shaft is avoided, and the anti-cavitation performance of the pump is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pump technical field, concretely points to a kind of self-balancing horizontal middle open multistage pump rotor body structure. BACKGROUND

[0002] As Figure 6 As shown in figure, it is the existing self-balancing horizontal middle open multistage pump rotor structure with shaft sheath, it includes pump shaft 100, pump shaft 100 outside connection drive end lock nut 200, baffle 300, "O" ring 400, shaft sleeve 500, first-stage impeller one 600, interstage shaft sleeve 700, last-stage impeller 800, first-stage impeller two 900, non-drive end lock nut 100, and there is the following insufficient place to adopt this structure, 1, baffle and pump shaft have no transmission key fixed and drive, and it is easy to produce loosening in running process, and relative motion is generated with pump shaft, leading to "O" ring failure of axial seal and drive end lock nut and non-drive end lock nut loosening;2, shaft sleeve, first-stage impeller one, interstage shaft sleeve, last-stage impeller and first-stage impeller two are connected with the way of pressing end face between each other, leading to fine sand in medium permeate to pump shaft surface through the gap of pressing end face, under the action of alternating stress, leading to pump shaft wear, fracture, difficult to disassemble;3, shaft sleeve, first-stage impeller one, interstage shaft sleeve, last-stage impeller and first-stage impeller two are disconnected between each other, and their respective gravity is respectively acted on corresponding pump shaft section, leading to pump shaft disturbance increase, rotor first critical speed reduces, possibly leading to resonance, if thickening pump shaft is used, will cause impeller inlet flow velocity increase, and water pump anti-cavitation performance is poor. CONTENT OF UTILITY MODEL

[0003] The utility model solves the technical problem in the above-mentioned prior art and provides a self-balancing horizontal middle open multistage pump rotor body structure.

[0004] To solve the above technical problems, the utility model adopts the technical scheme of:

[0005] The utility model provides a kind of self-balancing horizontal middle open multistage pump rotor body structure, including pump shaft, first stage impeller one, last stage impeller and first stage impeller two are provided on pump shaft, and first stage impeller one and first stage impeller two are provided with interstage shaft sleeve between last stage impeller, driving end lock nut and non-driving end lock nut are provided with on the both sides of pump shaft, and driving end lock nut and first stage impeller one between and non-driving end lock nut and first stage impeller two between are provided with shaft sleeve, and one end of the shaft sleeve is processed with sealing ring groove, and sealing ring one is provided in sealing ring groove, and driving end lock nut and non-driving end lock nut end are processed with pressing stop, and pressing stop is pressed into sealing ring groove and presses sealing ring one, and positioning stop is processed between the shaft sleeve, first stage impeller one, interstage shaft sleeve, last stage impeller and first stage impeller two, and the shaft sleeve, first stage impeller one, interstage shaft sleeve, last stage impeller and first stage impeller two are connected by positioning stop each other, and sealing ring two is provided at positioning stop.

[0006] Further, positioning concave stop is processed at the both ends of the interstage shaft sleeve and the other end of the shaft sleeve, and positioning convex stop is processed at the both sides of the hub of the first stage impeller one, last stage impeller and first stage impeller two, and positioning convex stop is clamped in positioning concave stop.

[0007] Further, mounting groove is processed on the positioning convex stop, and sealing ring two is connected in mounting groove.

[0008] Further, the first stage impeller one, last stage impeller and first stage impeller two are installed on pump shaft through key block.

[0009] Compared with prior art, the self-balancing horizontal middle open multistage pump rotor body structure has the following beneficial effects:

[0010] 1, the pressing stop of driving end lock nut and non-driving end lock nut is pressed in the sealing ring groove of shaft sleeve, which avoids the axial locking failure caused by the rotation of the retaining sleeve, and realizes the axial sealing without retaining sleeve.

[0011] 2, the first stage impeller one, last stage impeller, first stage impeller two, shaft sleeve and interstage shaft sleeve are sealed by sealing ring, which prevents the penetration of fine sand through the end face of each part to the surface of pump shaft, thereby preventing the wear, fracture and difficult disassembly of pump shaft.

[0012] 3, the first stage impeller one, last stage impeller, first stage impeller two, shaft sleeve and interstage shaft sleeve are connected by positioning stop, which connects each part into a rigid cylinder, and the cylinder and pump shaft are locked by driving end lock nut and non-driving end lock nut and bear the gravity and external load together, thereby reducing the disturbance of pump shaft, improving the first critical speed, and effectively improving the anti-cavitation performance of pump without changing the size of impeller inlet and the diameter of pump shaft. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1It is the structural schematic diagram of the utility model;

[0014] Figure 2 It is the structural schematic diagram of the utility model shaft sleeve;

[0015] Figure 3 It is the structural schematic diagram of the utility model drive end lock nut;

[0016] Figure 4 It is the structural schematic diagram of the utility model interstage shaft sleeve;

[0017] Figure 5 It is the structural schematic diagram of the utility model first stage impeller one;

[0018] Figure 6 It is the original pump rotor structure;

[0019] Among them, 1, pump shaft, 2, first stage impeller one, 3, last stage impeller, 4, first stage impeller two, 5, interstage shaft sleeve, 6, drive end lock nut, 7, non-drive end lock nut, 8, shaft sleeve, 9, support crossbeam, 10, sealing ring one, 11, sealing ring two, 12, positioning concave stop, 13, positioning convex stop, 14, mounting groove. DETAILED DESCRIPTION

[0020] The technical scheme in the utility model embodiment will be described clearly and completely below.

[0021] As Figures 1-5 shown, a self-balancing horizontal split multistage pump rotor body structure, including pump shaft 1, pump shaft 1 is provided with first stage impeller one 2, last stage impeller 3 and first stage impeller two 4, first stage impeller one 2, last stage impeller 3 and first stage impeller two 4 are all installed on pump shaft 1 through key block, and first stage impeller one 2 and first stage impeller two 4 are provided with interstage shaft sleeve 5 between last stage impeller 3, and pump shaft 1 both sides are provided with drive end lock nut 6 and non-drive end lock nut 7, and drive end lock nut 6 and first stage impeller one 2 between and non-drive end lock nut 7 and first stage impeller two 4 between are all provided with shaft sleeve 8, one end of shaft sleeve 8 is processed with sealing ring groove 9, and sealing ring one 10 is arranged in sealing ring groove 9, and the end of drive end lock nut 6 and non-drive end lock nut 7 is processed with compression stop 11, and compression stop 11 is inserted into sealing ring groove 9 and compresses sealing ring one 10, to realize the axial sealing of no baffle sleeve.

[0022] The positioning stop is processed between shaft sleeve 8, first stage impeller one 2, interstage shaft sleeve 5, last stage impeller 3 and first stage impeller two 4, and shaft sleeve 8, first stage impeller one 2, interstage shaft sleeve 5, last stage impeller 3 and first stage impeller two 4 are connected with each other through the positioning stop, and each part is connected in series as a rigid cylinder by adopting the mode of connecting with each other through the positioning stop.

[0023] In the embodiment, positioning recessed notches 12 are formed at both ends of the inter-stage shaft sleeve 5 and the other end of the shaft sleeve 8, positioning protruded notches 13 are formed at both sides of the hub of the first-stage impeller one 2, the last-stage impeller 3 and the first-stage impeller two 4, and the positioning protruded notches 13 are clamped in the positioning recessed notches 12.

[0024] A sealing ring two 11 is arranged at the positioning notches, which prevents fine sand from entering and reduces the surface wear of the pump shaft. In the embodiment, installation grooves 14 are formed on the positioning protruded notches 13, and the sealing ring two 11 is connected in the installation grooves 14. The sealing ring one 10 and the sealing ring two 11 are both "O" rings.

[0025] The utility model is not limited to the embodiment, and the person skilled in the art can still make some corrections or changes without departing from the spirit of the utility model, i.e. the disclosure range, so the protection scope of the utility model is limited to the range defined in the claims.

Claims

1. A self-balancing horizontal split-case multistage pump rotor structure, comprising a pump shaft, on which a first-stage impeller, a last-stage impeller, and a second-stage impeller are mounted, wherein interstage bushings are provided between the first-stage impeller and the last-stage impeller, and drive-end locking nuts and non-drive-end locking nuts are provided on both sides of the pump shaft, wherein bushings are provided between the drive-end locking nut and the first-stage impeller and between the non-drive-end locking nut and the second-stage impeller, characterized in that: One end of the bushing is machined with a sealing ring groove, and a sealing ring 1 is provided in the sealing ring groove. The ends of the driving end locking nut and the non-driving end locking nut are machined with a pressing stop, which extends into the sealing ring groove to press the sealing ring 1. The bushing, the first stage impeller 1, the interstage bushing, the last stage impeller and the second stage impeller are machined with a positioning stop. The bushing, the first stage impeller 1, the interstage bushing, the last stage impeller and the second stage impeller are connected to each other through the positioning stop. A sealing ring 2 is provided at the positioning stop.

2. The rotor body structure of a self-balancing horizontal split-case multistage pump according to claim 1, characterized in that: The two ends of the interstage bushing and the other end of the bushing are machined with positioning recesses, and the hubs of the first stage impeller, the last stage impeller and the second stage impeller are machined with positioning protrusions, which are locked in the positioning recesses.

3. The rotor body structure of a self-balancing horizontal split-case multistage pump according to claim 2, characterized in that: The positioning protrusion has a mounting groove, and the second sealing ring is connected in the mounting groove.

4. The rotor body structure of a self-balancing horizontal split-case multistage pump according to claim 1, characterized in that: The first stage impeller, the last stage impeller, and the second stage impeller are mounted on the pump shaft via key blocks.

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