CN111336130A - A swirl pump impeller with groove structure - Google Patents

Abstract

The present invention provides a swirl pump impeller with a groove structure. The impeller includes impeller blades, a rear cover plate, a hub and a back blade. The impeller blades are located on one side of the rear cover plate, and the back blades are located at On the other side of the rear cover plate, a groove is formed on the rear cover plate, the groove is arranged in the middle of the blade flow channel between the impeller blades, and the groove is consistent with the shape of the blade. The impeller of the swirl pump of the invention has good hydraulic performance, and the addition of grooves on the rear cover plate enhances the confinement of the impeller on the fluid and reduces losses.

Description

A swirl pump impeller with groove structure

technical field

The invention relates to the field of impellers, in particular to a swirl pump impeller with a groove structure.

Background technique

The swirl pump is a non-clogging pump, which is a multiphase flow pump named for the rotating vortex motion in the internal flow, and is mostly used for pumping complex media. The non-clogging characteristics of cyclone pumps make them widely used in sewage treatment, papermaking, chemical and pharmaceutical industries. The impeller of the swirl pump is open or semi-open. The impeller is biased to the side of the pump cavity or completely retracted to the back cavity of the pump casing. The two different impeller arrangements form two design concepts of the swirl pump. The arrangement is the result of a trade-off between pumping performance and non-clogging performance. When the swirl pump is working, a through flow is generated at the outlet of the impeller due to centrifugal force, and the medium is exchanged with the bladeless cavity in the middle of the impeller to form a circulating flow. After the impeller moves directly in the bladeless cavity, it is discharged through the outlet, so as to achieve the purpose of conveying complex and non-clogging.

The cyclone pump is a non-clogging pump suitable for conveying mixed media, but the traditional cyclone pump also has certain shortcomings. Due to the existence of the circulating flow in the pump, it causes a lot of hydraulic loss, so the lift and efficiency of the cyclone pump are not high. high.

After searching, the patent of application number CN201610856829 "A swirl pump impeller with a spiral structure at the front end and its design method", the invention is provided with a spiral blade in the front section of the impeller, the inner diameter of the spiral blade is fixed with the peripheral side of the hub, and the outer diameter of the spiral blade faces The hub extends far away, and the invention aims to reduce internal circulation flow and energy loss through the helical structure at the front end, thereby improving work efficiency. After searching, the patent with the application number CN201410481963 “A Design Method for a Non-clogging Swirl Pump Impeller with Long and Short Hemmed Blades”, the blades of the impeller include long blades and short blades with different lengths, and the long blades and the short blades are both. With a folded edge extending in the opposite direction to the rotation direction of the impeller, the invention reduces the hydraulic loss in the pump chamber by restricting the circulating flow, thereby improving the pump efficiency. It can be seen from the existing patents that the improvement of the impeller of the swirl pump reduces the structure of the circulating flow intensity, that is, the non-blocking property of the swirl pump is weakened to a certain extent. The flow state in the vaneless cavity is slotted through the back cover, which has a binding force on the liquid medium, reduces losses, and has a cutting function for solid fibers, which not only improves the work efficiency, but also improves the non-clogging of the swirl pump. performance.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention discloses a swirl pump impeller with a groove structure. The impeller includes impeller blades, a rear cover plate, a hub and a back blade, and the impeller blades are located at one of the rear cover plates. side, the back blade is located on the other side of the rear cover plate, the rear cover plate is provided with a groove, the groove is arranged in the middle of the blade flow channel between the impeller blades, the groove Consistent with the shape of the blade.

Optionally, the geometrical parameters of the groove and the geometrical parameters of the impeller satisfy the following relationship:

b ₂ =(0.15～0.2)D ₂ (3)

d _g =(0.250～0.365)δ _x (4)

β ₁ =25°～65° (5)

β ₂ =30°～50° (6)

where:

D _{g1 ——the} diameter of the groove inlet, m;

D _g2 —— diameter of groove outlet, m;

D ₁ ——the diameter of the impeller inlet, m;

D ₂ — the diameter of the impeller outlet, m;

d _g — groove depth, mm;

δ _x — thickness of rear cover, mm;

Q——flow, m ³ /s;

n——the rotational speed of the swirl pump, r/min;

h——design head of pump, m;

g——gravitational acceleration, m/s ² ;

b ₂ ——the width of the impeller outlet, m;

β ₁ ——the placement angle of the impeller inlet;

β ₂ ——the placement angle of the impeller outlet;

β _g1 — groove inlet angle;

β _g2 — groove outlet angle;

Z - the number of leaves.

Optionally, the number of the impeller blades is 8-10, and the impeller blades are evenly arranged on the cover plate.

Optionally, the number of the grooves is the same as that of the impeller blades.

Optionally, the inlet angle of the groove is the same as the inlet angle of the impeller blade, and the outlet angle of the groove is the same as the outlet angle of the impeller blade.

Optionally, the groove on the rear cover plate has a sharp edge and corner structure after being flattened by a milling cutter.

Optionally, the number of the back vanes is 6-8, and the back vanes are used to balance the axial force.

Adopt above-mentioned technical scheme, the present invention has following beneficial effect:

The invention is improved based on the open design of the swirl pump, the impeller itself has better hydraulic performance and passability, the groove structure in the flow channel can better constrain the fluid, make the flow velocity distribution in the flow channel more stable, and reduce A small part of hydraulic loss; the groove design is consistent with the shape of the impeller, which will not cause work interference in the flow channel, resulting in flow disorder, which can directly enhance the pumping capacity of the cyclone pump and improve the performance of the pump; this kind of groove structure can improve the performance. At the same time, it will reduce the pump inlet pressure and increase the risk of pump cavitation, but due to its special structure, the cyclone pump has better anti-cavitation performance, so the cyclone pump is more suitable for this improvement.

The impeller of the swirl pump provided by the present invention can not only improve the efficiency of the swirl pump, but also improve the passability and no-overload performance of the pump. When the pump rotates at high speed, the fibrous and granular solids can be cut and broken, which can effectively prevent the entanglement of solid impurities and reduce the risk of blockage of the flow channel; at the same time, the groove structure also helps to reduce the weight of the impeller and reduce the shaft. power.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

Fig. 1 is the front schematic diagram of the impeller structure of slotted cyclone pump;

Fig. 2 is the schematic diagram of the back of the impeller structure of the slotted cyclone pump;

Figure 3 is a front view of a slotted cyclone pump impeller;

4 is a schematic diagram of a single flow channel of a slotted cyclone pump impeller;

The following supplementary descriptions are provided for the accompanying drawings:

1. Blade, 2. Back cover, 3. Keyway, 4. Groove, 5. Hub, 6. Back blade.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure, or characteristic that may be included in at least one implementation of the present invention.

Example:

1 to 4 , an embodiment of the present invention discloses a swirling pump impeller with a groove structure, the impeller includes an impeller blade 1 , a rear cover plate 2 , a hub 5 and a back blade 6 , the impeller blade 1 Located on one side of the rear cover plate 2, the back blade 6 is located on the other side of the rear cover plate 2, the rear cover plate 2 is provided with a groove, and the groove is arranged on the impeller blade In the middle of the vane flow channel between, the groove is consistent with the shape of the vane. The hub 5 is located at the center of the rear cover 2 , and the side wall of the hub has a keyway 3 .

In this embodiment, the shape of the groove is consistent with the shape of the blade, and is located in the middle of the impeller flow channel. This structure can strengthen the impeller's ability to restrain the fluid and improve the pumping ability.

In some embodiments, the geometrical parameters of the groove and the geometrical parameters of the impeller satisfy the following relationship:

b ₂ =(0.15～0.2)D ₂ (3)

d _g =(0.250～0.365)δ _x (4)

β ₁ =25°～65° (5)

β ₂ =30°～50° (6)

where:

D _{g1 ——the} diameter of the groove inlet, m;

D _g2 —— diameter of groove outlet, m;

D ₁ ——the diameter of the impeller inlet, m;

D ₂ — the diameter of the impeller outlet, m;

d _g — groove depth, mm;

δ _x — thickness of rear cover, mm;

Q——flow, m ³ /s;

n——the rotational speed of the swirl pump, r/min;

h——design head of pump, m;

g——gravitational acceleration, m/s ² ;

b ₂ ——the width of the impeller outlet, m;

β ₁ ——the placement angle of the impeller inlet;

β ₂ ——the placement angle of the impeller outlet;

β _g1 — groove inlet angle;

β _g2 — groove outlet angle;

Z - the number of leaves.

The inlet diameter of the impeller blade is D ₁ , the outlet diameter of the impeller blade is D ₂ , the outlet width of the impeller blade is b ₂ , the blade inlet angle β ₁ , the blade outlet angle β ₂ , the number of impellers is Z, and the impeller rear cover Plate thickness δ _x , groove depth d _g .

In some embodiments, the number of the impeller blades is 8-10, and the impeller blades are evenly arranged on the cover plate.

In some embodiments, the number of grooves is the same as the number of impeller blades.

In some embodiments, the groove inlet angle coincides with the impeller blade inlet angle, and the groove outlet angle coincides with the impeller blade outlet angle.

In some embodiments, the groove on the rear cover plate has a sharp angular structure after being milled by a milling cutter, and the structure has a cutting function.

In some embodiments, the number of the back vanes is 6-8, and the back vanes are used to balance the axial force.

Figures 1, 3 and 4 together define the shape and size of the slotted cyclone pump impeller.

Specifically, in order to enhance the non-clogging of the swirl pump and reduce the difficulty of casting, cylindrical blades are used, and 10 blades are selected to ensure the pumping capacity of the swirl pump. In order to have a more stable velocity distribution in the blade flow channel, micro-grooves are selected in the middle of each flow channel, the groove shape is consistent with the shape of the cylindrical blade, and the groove depth is 1.5mm, that is, d _g =1.5mm.

Compared with the impeller of the swirl pump without groove structure, the impeller has been preliminarily optimized, and its performance is superior in similar products; the efficiency without groove is 50.2%, and the efficiency with groove is 52.0%. The head of the cyclone pump with groove structure is basically unchanged, indicating that the flow state in the pump is basically unchanged, that is, it will not affect the original solid-phase conveying capacity, and the efficiency is nearly 2% higher. The groove structure effectively improves the internal flow of the impeller, and the physical properties of the groove structure also improve the anti-clogging performance, which comprehensively improves the working efficiency of the swirl pump.

The impeller of the swirl pump of the present invention can be used in multiphase flow conditions, and can be used for conveying medium containing long fibers (such as straw, pulp, rope, poultry feathers, etc.) and solid particles (such as wood blocks, grains, etc.) in the pump. It is more suitable for the impeller arrangement to be on one side of the pump chamber rather than fully set back to the back side of the pump chamber.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (7)

1. A swirl pump impeller with groove structure, it is characterized in that: described impeller comprises impeller blade (1), rear cover plate (2), hub (5) and back blade (6), described impeller blade (1) Located on one side of the rear cover plate (2), the back blade (6) is located on the other side of the rear cover plate (2), and the rear cover plate (2) is provided with a groove , the groove is arranged in the middle of the blade flow channel between the impeller blades, and the groove is consistent with the shape of the blade. 2. The swirling pump impeller with groove structure according to claim 1, is characterized in that: the geometrical parameter of described groove and the geometrical parameter of described impeller satisfy following relation:

b ₂ =(0.15～0.2)D ₂ d _{g =} (0.250～0.365)δx β ₁ =25°～65° β ₂ =30°～50° where: D _{g1 ——the} diameter of the groove inlet, m; D _g2 —— diameter of groove outlet, m; D ₁ ——the diameter of the impeller inlet, m; D ₂ — the diameter of the impeller outlet, m; d _g — groove depth, mm; δ _x — thickness of rear cover, mm; Q——flow, m ³ /s; n——the rotational speed of the swirl pump, r/min; h——design head of pump, m; g——gravitational acceleration, m/s ² ; b ₂ ——the width of the impeller outlet, m; β ₁ ——the placement angle of the impeller inlet; β ₂ ——the placement angle of the impeller outlet; β _g1 — groove inlet angle; β _g2 — groove outlet angle; Z - the number of leaves. 3 . The swirling pump impeller with groove structure according to claim 1 , wherein the number of the impeller blades is 8-10 pieces, and the impeller blades are evenly arranged on the cover plate. 4 . 4 . The swirling pump impeller with groove structure according to claim 1 , wherein the grooves and the impeller blades have the same number. 5 . 5 . The swirling pump impeller with groove structure according to claim 2 , wherein the inlet angle of the groove is consistent with the inlet angle of the impeller blade, and the outlet angle of the groove is the same as the outlet angle of the impeller blade. 6 . Angles are the same. 6 . The swirling pump impeller with groove structure according to claim 1 , wherein the groove on the rear cover plate has a sharp angular structure after being flattened by a milling cutter. 7 . 7 . The swirling pump impeller with groove structure according to claim 1 , wherein the number of the back vanes is 6-8, and the back vanes are used to balance the axial force. 8 .

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