WO2011016619A2

WO2011016619A2 - Centrifugal pump having an improved impeller

Info

Publication number: WO2011016619A2
Application number: PCT/KR2010/004363
Authority: WO
Inventors: 안병무
Original assignee: (주)안국밸브
Priority date: 2009-08-06
Filing date: 2010-07-05
Publication date: 2011-02-10
Also published as: WO2011016619A3; KR100954345B1

Abstract

The centrifugal pump of the present invention has an impeller of an improved construction. More specifically, the impeller of the present invention has a blade wherein the front surface comprises a sunken recess (124) formed extending in the length direction, and, with respect to the sunken recess (124), the height (Ha) of the blade on the side in the direction of rotation is formed so as to be low while the height (Hb) of the blade on the opposite side to the direction of rotation is formed so as to be high, and wherein the face of the blade (122) on the side in the direction of rotation is formed with a concave part (132) and a convex part (133), such that the blade has a function whereby solid matter which has flowed in can easily be ground up or cut. The centrifugal impeller of the present invention, which is constituted in this way, has the concavo-convex parts (132)(133) formed in the front face of the blade and has a characteristic effect whereby it can effectively grind solid matter, and thus it is particularly useful as a pump for conveying fluids (solids-laden fluids) containing dirty water, sludge, slurry and the like.

Description

Centrifugal pumps with improved impeller

The present invention relates to a centrifugal pump having improved efficiency, and improves the pumping efficiency and performance by improving the shape of an impeller provided in the housing of the centrifugal pump.

Pumps for sucking and transporting fluids are broadly classified according to their principle structure or power source, and are related to centrifugal pumps which are cost-effective pumps by structural classification.

The most common impellers for centrifugal pumps are radial type impellers and mixed type impellers with side plates on the suction side, and semi open impellers for slurry transfer. Impellers with only side plates on the boss side) and open impellers (without suction side plates or with minimal side plates on the boss side).

Hermetic impeller is suitable for the transfer of solids-free water (general fluid), semi-open impeller is turbid sewage, water transfer (turbid fluid) for drainage, open impeller is sewage, sludge, slurry ( Suitable for the transfer of fluids (solid fluids) containing slurries).

Impeller is a configuration that functions to pump the liquid by generating a centrifugal force while rotating inside the casing, the most important part to act as a pump, and also has the greatest impact on the characteristics of the pump. Therefore, depending on the structure of the impeller, its use is different and the effect will be enormous.

A pump with no guide vane on the outer perimeter of the impeller and a vortex chamber directly adjacent to the outer circumference is called a volute pump, which is generally used for low heads.

However, the impeller 20a (hereinafter, referred to as 'prior art 1') provided in the conventional centrifugal pump, as shown in FIG. Depending on the characteristics, liquids containing solids in the form of vanes of one vane body, two or more outer curves or spiral shapes, or more than 10% The liquid is also worn out so that the air outlet 14, which is spaced apart from the impeller 20a, the vane blade 22a and the inner wall of the casing 12a, is blocked, damaged, or entangled, and is fixed to the fixed cavitation. As a result, the suction action becomes impossible and at the same time wears out and eventually damages the impeller 20a. There was a problem in that the casing (12a) to the inner wall is correlated with damage to the suction and discharge of the fluid.

That is, the blade feather (22a) is embossed to be easily worn, there is a problem that the pump efficiency is low, the use is limited only in the case of low lift.

In order to solve this problem, Korean Patent No. 732196 (filed in 2005) (hereinafter referred to as 'Prior Technology 2') solves the problems of the existing centrifugal pumps, such as wear, reduced suction force, low efficiency, and durability of parts. 2 and 3, an impeller 20b for a slurry pump, in which a groove 24b is formed in a lengthwise direction on an upper surface of a radially protruding wing feather 22b. ) Has been disclosed.

Figure 2 shows a cross-sectional view of a centrifugal pump with an impeller 20b, Figure 3 is a perspective view showing an impeller according to the prior art 2.

However, in the case of the related art 2, not only does the head not increase much, but also it takes a long time from the start of the operation of the centrifugal pump to reach the normal rotational speed, and between the blade vane 22b and the inner wall of the casing 12b Its disadvantage is that large power consumption is required for the initial operation due to its large contact area.

In particular, in the case of a centrifugal pump used for transporting a fluid (solid fluid) containing sewage, sludge, slurry, and the like, solids are contained in the vane blades 22b and the wings of the impeller 20b. There are many problems that can be caught between the feather 22b or between the back surface 25b of the wing feather 22b and the casing inner wall 112b, causing a decrease in suction force, and even causing a pump failure.

The present invention has been made to solve the problems of the prior art as described above, impellers particularly suitable for the transport of fluids (solid fluid) containing sewage, sludge, slurry (slurry), etc. It is an object to propose a centrifugal pump having.

In addition, an object of the present invention is to propose a centrifugal pump that can improve the suction force and efficiency compared to the prior art.

In order to achieve the above object, the centrifugal pump according to the present invention is characterized by having an impeller of an improved structure. That is, the impeller wing of the present invention is formed with a concave groove 124 is formed long in the longitudinal direction on the front surface thereof, based on the concave groove 124, the height of the blade feather in the rotational direction (Ha) ) Is formed low, and the wing feather height (Hb) in the opposite direction of rotation is formed high.

In addition, a recess 132 and a protrusion 133 are formed on the side surface in the rotational direction of the vane 122 to easily grind or cut the solids into which the vane is introduced. It is characterized by having.

In addition, specific means for achieving the object of the present invention will be presented in the detailed description of the invention.

The centrifugal pump according to the present invention is a centrifugal pump particularly suitable for transporting fluids (solid fluids) containing sewage, sludge, slurry, etc., with much lower initial starting power than the prior art. It is possible to start the drive, high efficiency, it is possible to obtain the effect of increasing the suction force of the fluid.

In particular, the centrifugal pump according to the present invention has a characteristic effect that can form an

uneven portion

132, 133 on the front side of the wing feather, effectively crush the solid.

1 is a cross-sectional view of the main part showing an embodiment of a conventional centrifugal pump

2 and 3 are a sectional view of the main portion and the impeller of the centrifugal pump disclosed in the prior art (Korean Patent No. 732196)

Figure 4 is a perspective view showing a schematic shape of the centrifugal pump impeller according to the present invention

5 is a cross-sectional view taken along the line A-A in FIG.

6 is a cross-sectional view taken along the line B-B in FIG.

Figure 7 is a perspective view showing the auxiliary feather formed on the back of the impeller according to the present invention

Hereinafter, with reference to the accompanying drawings to describe the present invention in detail.

Figure 4 is a perspective view showing a schematic shape of the centrifugal pump impeller according to the present invention, Figure 5 is a cross-sectional view taken along the line A-A in Figure 4, Figure 6 is a cross-sectional view taken along the line B-B in FIG.

A centrifugal pump according to a preferred embodiment of the present invention includes a housing having a suction port and a discharge port, and an impeller 120 provided inside the housing and rotating by a driving means.

As shown in FIG. 4, the impeller 120 includes a plurality of wing feathers 122 extending radially at the same angle from the center of rotation, and the shaft hole 130 at the center thereof.

Here, the drive shaft is exposed to the inside of the housing, the shaft hole of the impeller is fitted to the drive shaft is coupled. In addition, the housing is an annular half-volute type, and in the low pressure part, the clearance between the inner diameter of the housing and the outer diameter (end feather end surface) of the impeller 120, that is, the vortex casing is Although it is very narrow, it is a semivolute type in which the size of the vortex chamber becomes larger as the inner diameter of the housing gradually increases toward the high pressure part.

In particular, in the present invention, the concave groove 124 is formed in the front surface (surface) of the impeller wing feathers long along the longitudinal direction of the wing feathers. The concave groove 124 is configured to be gradually deeper as it moves away from the center of rotation, so that the fluid introduced through the suction port can be easily transferred to the vortex chamber through the concave groove 124, this concave groove 124 Has a function as an induction furnace.

In the present invention, the blade feather 122 is divided into the front portion 123a and the rear portion 123b by the concave groove 124, and the impeller based on the concave groove 124 in one wing feather. The portion located on the side in which the direction of rotation is referred to as the front portion 123a, and the portion located on the opposite side of the front portion with respect to the concave groove will be referred to as the rear portion 123b.

In the present invention, the height Ha (also referred to as 'thickness') of the front part (the rotational direction) of the vane is formed to be lower than the height of the feather tip Hb of the rear part.

The centrifugal pump according to the present invention configured as described above has a torque at the moment when the pump starts operation as compared with the case where the height of the vane blade of the front part (the rotational direction) and the height of the vane blade of the rear part (the opposite direction) are the same. It can mitigate and lower the starting power required to start a stationary pump, especially when used in high viscosity liquids.

Further, in the present invention, by forming the recess 132 and the protrusion 133 on the side of the front side of the wing blade 122 in the rotational direction (front side), the impeller 120 is formed through the suction port. The solids introduced into the center portion are crushed or cut by the

uneven parts

132 and 133 formed on the front side of the wing feathers while being transferred to the vortex chamber along the wing feathers.

The recess 132 and the protrusion 133 are preferably formed on the side surface of the wing feather front part. If the concave-convex portion is formed on the front side of the wing feather rear part, the fluid may be disturbed by the concave-convex portion while the fluid introduced through the suction port is transferred to the vortex chamber through the concave groove 124. In this case, the suction force may be a cause of deterioration, which is not preferable.

In particular, the protrusion 133 is formed at the end of the blade feather, by using a strong centrifugal force acting on the blade feather tip and the impact force of the protrusion 133, the solids that are not crushed by the recess 132 to strongly The effect of grinding can be obtained.

Furthermore, in the present invention, the auxiliary feather 131 is further provided on the back of the wing feather. In the prior art 2, the back of the impeller is made of a flat plane, so that the contact area with the inner surface of the casing is large, which not only causes a large torque for initial start-up, but also acts as a cause of output loss due to frictional force, resulting in low efficiency. There was no choice but to. The auxiliary collar in the present invention can achieve the effect of increasing the suction force of the fluid while solving the above problems.

As shown in FIG. 7, the auxiliary feather 131 in the present invention, the width and thickness is formed to be constant is provided on the back of each wing feather 122, respectively, the further away from the rotation center, the opposite the rotation It consists of a shape that curves gently toward the direction.

The auxiliary feather 131 having such a configuration can minimize the gap between the impeller and the casing wall, and reduce the friction area with the casing wall. Furthermore, the fluid flowing between the wing feathers and the wing feathers effectively flows into the vortex chamber. It will be pushed out.

The centrifugal pump according to the present invention configured as described above has the characteristic effect of effectively forming the

uneven parts

132 and 133 on the front side of the blade feather, which can effectively crush the solids, and improve the suction force and efficiency compared to the prior art. It is particularly useful as a pump for conveying a fluid (solid fluid) containing sewage, sludge, slurry, and the like.

In the above description of the present invention, the centrifugal pump having an impeller having a specific shape and structure has been described with reference to the accompanying drawings, but the present invention can be variously modified and changed by those skilled in the art. It should be interpreted as falling within the protection scope of the present invention.

Claims

A housing having a suction port and a discharge port;

In the centrifugal pump which is provided in the housing, consisting of a plurality of blade feathers 122 extending radially at the same angle from the center of rotation, comprising an impeller 120 rotated by a driving means,

Concave groove 124 is formed on the surface of the wing feather 122 is formed long along its longitudinal direction,

Based on the concave groove 124, the vane blade height (Ha) in the rotational direction is lower than the vane blade height (Hb) in the opposite direction of rotation is made of a centrifugal pump.
The method of claim 1,

Concave portions 132 and protrusions 133 are formed on the front side of the wing blade 122 in the rotational direction, and the protrusions 133 are provided at the ends of the wing feathers. Centrifugal pump characterized in that.
The method of claim 2,

The auxiliary feather 131 is further provided on the back of the wing feather,

Centrifugal pump is characterized in that the auxiliary feather is gently curved toward the opposite direction of rotation as it moves away from the center of rotation.
The method according to any one of claims 1 to 3,

The concave groove 124 is formed long along the longitudinal direction of the blade feather, the depth of the centrifugal pump characterized in that the deeper the further away from the center of rotation.