Balancing frame in solid-liquid two-phase flow carries
The present invention relates to a kind of balancing frame, a kind of balancing frame in solid-liquid two-phase flow carries.
Bascule is typically common in centrifugal pump, and it generally comprises balancing frame and balancing drum.Balancing frame and balancing drum rotate with rotor after being contained in impeller.Wherein balancing frame is in order to balancing axial thrust.The action principle of balancing frame is as follows: from the final stage liquid with pressure out, being adjusted in the cavity before set radial clearance flows into balancing frame, cavity is in high pressure conditions.Having balance pipe to be connected with pump intake after balancing frame, its pressure is approximately inlet pressure.So balancing frame pressure at both sides is unequal, thus the most just creates axial thrust backward, i.e. equilibrant.Equilibrant is contrary with axial force, thus automatically balances the axial thrust of impeller.And balancing frame can carry out experiment of dynamic balancing before installing, traditional method of adjustment is polish its surface or spot welding counterweight, the former is relatively complicated and needs to polish its symmetry direction in the case of the polishing excessively of card somewhere again, card can be caused irregular, particularly for this balancing frame, if being polished in circumference convex surface position, the assymmetric motion of fluid near the irregular place of disk body polishing will be caused under operating condition, and the latter is owing to the weight of used welding rod can make balancing frame counterweight not reach preferable effect at calculation pad more difficult to estimate during spot welding, also difficult realization regulates dynamically balanced effect.
The reason causing balance disk wear includes the following aspects: 1, transport the impact of medium: due to water quality, acid-base value difference, the service life of balancing frame is the most different.Pump for high-speed cruising, particularly in solid-liquid two-phase flow conveying, after the solid particle such as the silt contained in medium enters balancing frame, also will accelerate the abrasion of balancing frame, particularly balancing frame edge is because speed is big, easily contact the abrasion caused, and has a strong impact on the stable operation life-span of pump；2, the impact of cavitation effect near balancing frame: the frequency of impact owing to producing when cavitation erosion occurs is the highest, plastic deformation and differential hardening can be caused, and produce metal fatigue phenomenon, until metal surface forms the mechanical denudations such as cellular hole, these will accelerate the destruction of balancing frame.
Must be replaced when balance disk wear is excessive, otherwise the radial direction amount of unbalance causing rotating shaft is strengthened, cause vibration and the noise of pump group, pump shaft may be damaged time serious, and need when changing balancing frame Beng Fan factory to be dismantled, change parts and reinstall, cycle back and forth of transporting is longer, certainly will impact production efficiency.
Summary of the invention
In order to overcome the deficiency of balancing frame described in background technology, therefore balancing frame is improved, it is an object of the invention to provide a kind of balancing frame in solid-liquid two-phase flow carries, thus realize the relatively simple dynamic balancing completing balancing frame accurately and adjust and extend it and particularly transport containing service life during solid particle medium.
The technical solution used in the present invention is:
The present invention includes: the both sides periphery of balancing frame is respectively work surface and non-working surface, the edge of balancing frame both sides periphery is provided with blade the most uniformly at intervals, it is the groove of the notch between adjacent two blades, the cylindrical side of balancing frame is provided with blind hole uniformly at intervals, equipped with the bolt for adjustment dish counterweight in the blind hole of balancing frame centrosymmetric both sides, spring leaf is installed and for finely tuning the pad of counterweight between bolt and blind hole.
Described blade is equal with the radial width of the annular convex surface of balancing frame work surface side along the length of balancing frame radial direction.
Described blind hole is along balancing frame groove of the notch center alignment axially and between two adjacent blades.
The quantity of described blind hole is the even number between 12～24, and the quantity of described blade is the twice of blind hole quantity.
The shape of described blade is pressed Way out and is used backward bent vane, and the kind of blade uses plain vane.
The width of described blade is the 1/6～1/5 of balancing frame thickness.
The invention has the beneficial effects as follows:
1, the present invention can effectively reduce mechanical wear and the cavitation erosion of balancing frame, extends its service life.
2, the present invention when carrying out dynamic balancing and adjusting to balancing frame, more convenient its aequum that adjusts in the case of not polishing pad surface counterweight or spot welding counterweight with saving time of energy, reduces vibration, noise and the radial imbalance force produced in pump motor process.
3, the present invention can meet the demand of the field pumps such as oil, chemical industry and water conservancy.
Accompanying drawing explanation
Fig. 1 is the work surface schematic diagram of balancing frame of the present invention.
Fig. 2 is the radial direction schematic diagram of balancing frame of the present invention.
Fig. 3 is the non-working surface schematic diagram of balancing frame of the present invention.
Fig. 4 is bolt and pad, the scheme of installation of spring leaf at blind hole.
Fig. 5 is the side view of balancing frame of the present invention.
Fig. 6 is the partial enlarged drawing of region A in Fig. 5.
In figure: 1, blade, 2, the groove of the notch, 3, outer blind hole, 4, interior blind hole, 5, annular convex surface, 6, non-working surface, 7, bolt, 8, spring leaf, 9, pad.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Such as Fig. 1, shown in Fig. 3, the both sides periphery of balancing frame is respectively work surface and non-working surface, balancing frame work surface side is provided with annular convex surface 5, the edge of balancing frame both sides periphery is provided with blade 1 the most uniformly at intervals, both sides blade 1 is all generally aligned in the same plane with both sides periphery, it is the groove of the notch between adjacent two blades 1, such as Fig. 2, shown in Fig. 4, the cylindrical side of balancing frame is provided with blind hole uniformly at intervals, equipped with the bolt 7 for adjustment dish counterweight in the blind hole of balancing frame centrosymmetric both sides, spring leaf 8 is installed and for finely tuning the pad 9 of counterweight between bolt 7 and blind hole 3.
Balancing frame side is work surface, and opposite side is non-working surface, and the periphery of the side of work surface has annular convex surface, and blade 1 is peripheral in annular convex surface uniformly at intervals, and the circumferential edge of the periphery of the side of non-working surface is along being provided with blade 1 uniformly at intervals.
Blade 1 is equal with the radial width of the annular convex surface of balancing frame work surface side along the length of balancing frame radial direction.
As shown in Figure 5, Figure 6, blind hole is along balancing frame groove of the notch center alignment axially and between two adjacent blades 1.
The quantity of blind hole 3 is the even number between 12～24, the twice that quantity is blind hole 3 quantity of described blade 1.
The shape of blade 1 is pressed Way out and is used backward bent vane, and the kind of blade 1 uses plain vane.
The width of blade 1 is the 1/6 of balancing frame thickness, and blade 1 width is the blade 1 length along balancing frame axial direction.
As shown in Figure 4, blind hole is divided into outer blind hole 3 and interior blind hole 4, the size of outer blind hole 3 should be designed according to the head that can be entirely enclosed in bolt, and the size of interior blind hole 4 should be designed according to the thread size of bolt.
Balancing frame side circumferentially has blind hole, its aequum can be adjusted in the case of not polishing pad surface counterweight or spot welding counterweight by bolt tie spacer and spring leaf in more convenient timesaving, and reduce because of cause dynamic balancing to adjust radial imbalance force and the vibration that the rotating part of the pump the most accurately caused produces in motor process of the defect of existing dynamic balance adjusting method.
Blade 1 shape of the present invention uses cylindrical swept-back lobate, backward bent vane bending direction is contrary with impeller direction of rotation, therefore the total head of generation is less in running, runner energy loss is little, efficiency is higher, balancing frame uses this kind of blade and the above-mentioned arrangement can be when pump work, with less resistance, disturbance and noise form a medium protective layer around balancing frame, when solid particle is near balancing frame particularly disk body edge, the export-oriented centrifugal drag effect driving neighbouring fluid to produce will be rotated with dish by blade, reduce the possibility of contact and collision friction disk body；Rotate through blade to neighbouring fluid workmanship supercharging by the induced effect of main shaft with axle simultaneously, also will effectively reduce and produce, owing to pressure is relatively low, the possibility that disk body is damaged by cavitation erosion near disk body；For the running noises of pump, cavitation erosion is also one of reason producing noise in pump operation, that reduces cavitation erosion generation may the most just decrease the possibility herein producing noise, therefore the noise during so design can effectively reduce the mechanical wear of balancing frame and cavitation erosion and pump operation, extend its service life.
Above-mentioned bolt can use multiple bolt to configure, as a example by hexagon socket head cap screw, when dynamic balance weight, can install and tighten hexagon socket head cap screw, pad and spring leaf in non-equilibrium site side and axial symmetry side thereof, other positions need not install, the most unbalanced important by by selecting the pad of different number or Different Weight to offset, it is possible to coordinate the purpose using the spring leaf of Different Weight to reach to offset radial imbalance force.Therefore when it is carried out dynamic balancing adjustment, conveniently can adjust its aequum in the case of not polishing pad surface counterweight or spot welding counterweight by number and the weight of adjustment spring leaf of increase and decrease hexagon socket head cap screw pad, counterweight efficiency and accuracy rate will be effectively improved, and accurate adjustment dynamically balanced to balancing frame will effectively reduce vibration, noise and the radial imbalance force that in pump motor process, rotating part produces.
Above-mentioned detailed description of the invention is used for illustrating the present invention rather than limiting the invention, in the protection domain of spirit and claims of the present invention, and any modifications and changes that the present invention is made, both fall within protection scope of the present invention.