CN103244456B - A kind of centrifugal pump impeller - Google Patents

Abstract

The invention discloses a centrifugal pump impeller. It includes a disc-shaped cover plate that constitutes the impeller of the centrifugal pump. The cover plate has an installation opposite surface corresponding to the pump body, pump cover or guide body of the centrifugal pump. The opposite surface of the cover plate has a plurality of grooves, and the grooves surround The opposite surfaces are arranged symmetrically and uniformly, the groove opens outward in the radial direction of the cover plate, and the groove forms a tooth-shaped cavity with the pump body, pump cover or guide body of the centrifugal pump. The impeller of the present invention transmits energy to the fluid flowing out of the main channel of the impeller through the tooth-shaped cavity outside the impeller cover plate. This energy transfer process through three-dimensional flow kinetic energy exchange can be repeated many times in the entire circumferential toothed flow channel, so it has a high lift that cannot be achieved by conventional vane pumps. The invention improves the head of the existing centrifugal pump under the premise of keeping the geometric size and the flow rate unchanged.

Description

A centrifugal pump impeller

technical field

The invention belongs to the field of mechanical design and manufacture, in particular to the field of design and manufacture of centrifugal pumps, in particular to the technology of design and manufacture of impellers of single-stage and multi-stage centrifugal pumps.

Background technique

Improving the head of centrifugal pump is the key to centrifugal pump technology. The main method of increasing the lift of the existing common vane pump, especially the lift at the dead point, is to increase the speed of the pump and increase the outer diameter of the impeller. These methods will increase the manufacturing cost and the volume of the product.

Contents of the invention

According to the deficiency of the prior art, the invention discloses a centrifugal pump impeller. The invention adopts a new type of compound impeller and forms a reasonable cooperation with the pump body, and forms a series working model of two types of impellers under the premise that the pump speed and the size of the impeller remain unchanged, thereby effectively improving the lift of the centrifugal pump.

The present invention is realized through the following technical solutions:

The centrifugal pump impeller includes a disc-shaped cover plate that constitutes the impeller of the centrifugal pump. The cover plate has an installation opposite surface corresponding to the pump body, pump cover or guide body of the centrifugal pump. It is characterized in that: the opposite surface of the cover plate There are multiple grooves on the surface, and the grooves are arranged symmetrically and evenly around the opposite surface. The grooves open outward in the radial direction of the cover plate. The grooves form a tooth-shaped cavity with the pump body, pump cover or guide body of the centrifugal pump.

The grooves are arranged on the circumference of the opposite surface of the disc-shaped cover plate, and the number is 24 to 60. The selection of the number of grooves should also consider the diameter of the impeller and the manufacturing method. Usually, the groove teeth between two adjacent grooves The ratio of the maximum circumferential thickness to the axial height of the groove is 0.6-1.5.

The setting of the groove is mainly considered from the perspective of structure and strength. The axial height of the groove is 0.4-0.6 times the thickness of the impeller cover plate, and the radial length of the groove is about 1.1-2 times the axial height.

When the present invention is applied to a single-stage centrifugal pump, the impeller has two oppositely arranged cover plates, and each cover plate has grooves arranged on opposite surfaces.

When the present invention is applied to a multistage centrifugal pump, the impeller has a cover plate, and the cover plate has grooves arranged on the opposite surface.

The core of the present invention is the grooved impeller and the tooth-shaped cavity formed by the matching pump body, pump cover or deflector. The tooth-shaped cavity structure repeatedly performs work on the fluid, which improves the head of the ordinary vane centrifugal pump. The flow channel inside the impeller cover plate is of the common vane pump impeller type, and the opposite surface of the cover plate has a flow channel similar to the impeller of the vortex pump, and forms a structure similar to the vortex pump by cooperating with the pump chamber and the pump cover. The high-pressure fluid at the outlet of the impeller obtains higher pressure after repeated work by the tooth-shaped cavity outside the cover plate.

The energy of the ordinary vane-type centrifugal pump fluid only comes from the main channel of the impeller, but in the present invention, the high-pressure fluid flowing out of the main channel of the impeller will flow into the pump cavity of the composite vane outside the impeller again, passing through the toothed small blades for many times. Repeated work to obtain higher pressure, thereby increasing the head of the centrifugal pump.

The impeller of the present invention transmits energy to the fluid flowing out of the main channel of the impeller through the tooth-shaped cavity outside the impeller cover plate. This process of transferring energy through three-dimensional kinetic energy exchange can be repeated many times in the entire circumferential toothed flow channel, so it has a high head that cannot be achieved by conventional vane pumps. The invention improves the head of the existing centrifugal pump under the premise of keeping the geometric size and the flow rate unchanged.

Description of drawings

Fig. 1 is a schematic diagram of the planar structure of the impeller of the single-stage centrifugal pump of the present invention;

Fig. 2 is a radial sectional view of a single-stage centrifugal pump impeller of the present invention;

Fig. 3 is a three-dimensional schematic view of the impeller of the single-stage centrifugal pump of the present invention;

Fig. 4 is a structural sectional view of a single-stage centrifugal pump of the present invention;

Fig. 5 is an enlarged schematic diagram of the structure of the tooth-shaped cavity of the single-stage centrifugal pump of the present invention, that is, a partially enlarged schematic diagram of Fig. 4;

Fig. 6 is a schematic diagram of the planar structure of the impeller of the multistage centrifugal pump of the present invention;

Fig. 7 is a radial sectional view of the impeller of the multistage centrifugal pump of the present invention;

Fig. 8 is a three-dimensional schematic view of the impeller of the multistage centrifugal pump of the present invention;

Fig. 9 is a schematic cross-sectional view of the impeller installation structure of the multistage centrifugal pump of the present invention;

Fig. 10 is an enlarged schematic diagram of the structure of the tooth-shaped cavity of the multistage centrifugal pump of the present invention, that is, a partially enlarged schematic diagram of Fig. 9 .

In the figure, 1 is the impeller, 1a is the groove tooth, 1b is the groove, 1c is the opposite surface, 2 is the pump body, 3 is the tooth-shaped cavity, 4 is the pump cover, and 5 is the guide body.

detailed description

The present invention is further described by the following examples. This example is only used to further illustrate the present invention, but it cannot be interpreted as limiting the protection scope of the present invention. Essential improvements and adjustments belong to the protection scope of the present invention.

Example 1

Combining Figures 1 to 5.

This example is a single-stage centrifugal pump. As shown in the figure, the impeller 1 of the centrifugal pump includes a disc-shaped cover plate that constitutes the impeller 1 of the centrifugal pump. The impeller 1 of the single-stage centrifugal pump has two opposite cover plates. The pump body 2 and the pump cover 4 of the pump are installed on the opposite surface 1c. There are multiple grooves 1b on the surface of the opposite surface 1c on the cover plate. The grooves 1b are arranged symmetrically and uniformly around the opposite surface 1c. The outward opening in the direction forms a tooth-shaped cavity 3 with the pump body 2 and the pump cover 4 of the centrifugal pump.

Grooves 1b are arranged on the circumference of the opposite surface 1c of the disc-shaped cover plate, and the number is 24-60.

The ratio of the maximum circumferential thickness of the groove tooth 1a between two adjacent grooves 1b to the axial height of the groove 1b is 0.6-1.5, and the axial height of each groove 1b is 0.4-0.6 times the thickness of the cover plate of the impeller 1, The radial length of the groove 1b is about 1.1 to 2 times the axial height.

The single-stage centrifugal pump impeller 1 is composed of two opposite cover plates. The main water channel is between the cover plates. Usually, under the rotating centrifugal pressure, water enters the pressurized water chamber from the main water channel. The two cover plates are respectively connected to the pump body 2 or the pump cover. 4. There is an opposite surface 1c that rotates and fits, as shown in Figure 4; on the edge of the opposite surface 1c of the two cover plates, the present invention is provided with a groove 1b, and the so-called groove 1b is a shape similar to a drawer with an outer end opening, as shown in Figure 1, As shown in Fig. 2 and Fig. 3, the grooves 1b are evenly spaced on the peripheral edge of the opposite surface 1c of the cover plate, and the openings are outward; the grooves 1b can be cubes or other shapes.

A tooth-shaped groove 1b is processed on the front and rear cover plates of the impeller 1 or only on the outer edge of the single-side cover plate, and the tooth-shaped cavity 3 opening toward the pressure water chamber is formed by cooperating with the pump body 2 and the pump cover 4 . The high-pressure fluid flowing out of the main channel of the impeller 1 flows into the tooth-shaped cavity 3 again and passes through the tooth-shaped groove 1b to perform work to obtain a higher pressure, thereby increasing the head of the centrifugal pump.

The shape of the part of the pump body 2 and the pump cover 4 that cooperates with the tooth-shaped cavity 3 is not limited to a plane, and can be processed into an arc-shaped surface to form a cavity with a larger space when matched with the tooth-shaped groove 1b.

Example 2

Combining Figure 6 to Figure 10.

This example is a multi-stage centrifugal pump. As shown in the figure, the impeller 1 of the centrifugal pump includes a disc-shaped cover plate that constitutes the impeller 1 of the centrifugal pump. Corresponding to the installation of the opposite surface 1c, the surface of the opposite surface 1c on the cover plate has a plurality of grooves 1b, the grooves 1b are arranged symmetrically and evenly around the opposite surface 1c, and the grooves 1b open outward in the radial direction of the cover plate and are connected to the centrifugal pump. The guide body 5 forms the tooth-shaped cavity 3 .

Grooves 1b are arranged on the circumference of the opposite surface 1c of the disc-shaped cover plate, and the number is 24-60.

The ratio of the maximum circumferential thickness of the groove tooth 1a between two adjacent grooves 1b to the axial height of the groove 1b is 0.6-1.5, and the axial height of each groove 1b is 0.4-0.6 times the thickness of the cover plate of the impeller 1, The radial length of the groove 1b is about 1.1 to 2 times the axial height.

There are multiple sets of impellers 1 in multi-stage centrifugal pumps, and each set of impellers 1 has a back cover that rotates with the deflector 5. Usually, under the centrifugal pressure of multiple sets of impellers 1, the water is repeatedly pressurized. The opposite surface 1c of the guide body 5 rotates, as shown in Figure 9; on the edge of the opposite surface 1c of the cover plate, the present invention is provided with a groove 1b, the so-called groove 1b is a shape similar to a drawer with an outer end opening, as shown in Figure 6, As shown in Fig. 7 and Fig. 10, the grooves 1b are evenly spaced on the peripheral edge of the opposite surface 1c of the cover plate, and the openings are outward; the grooves 1b can be cubes or other shapes.

In this example, the flow channels on the inside of the front and rear cover plates of the impeller 1 are common vane pump impeller types, and a tooth-shaped groove 1b is processed on the outside of the rear cover plate, and a tooth-shaped cavity 3 with an opening facing the pressurized water chamber is formed by cooperating with the guide body 5 . The high-pressure fluid flowing out of the main channel of the impeller 1 flows into the tooth-shaped cavity 3 again and passes through the tooth-shaped groove 1b to perform work to obtain a higher pressure, thereby increasing the head of the centrifugal pump.

The shape of the portion of the guide body 5 that cooperates with the tooth-shaped cavity 3 is not limited to a plane, and can be processed into an arc-shaped surface to form a cavity with a larger space when it cooperates with the tooth-shaped groove 1b.

Claims (4)

1. a centrifugal pump impeller, comprise the wheel dish type cover plate forming centrifugal pump impeller (1), cover plate has the installation opposing side (1c) corresponding with the pump housing of centrifugal pump, pump cover or deflector, it is characterized in that:

On described cover plate, there is multiple groove (1b) on the surface of opposing side (1c), groove (1b) is arranged symmetrically and evenly around opposing side (1c), groove (1b) is at the outside opening of cover plate radial direction, and the pump housing of groove (1b) and centrifugal pump, pump cover or deflector form profile of tooth cavity (3);

Groove tooth (1a) maximum circumferential thickness between two adjacent grooves (1b) and the ratio of groove (1b) axial height are 0.6 ~ 1.5,0.4 ~ 0.6 times that each groove (1b) axial height is impeller (1) cover sheet thickness, groove (1b) radial length is axial height 1.1 ~ 2 times.

2. centrifugal pump impeller according to claim 1, is characterized in that: described groove (1b) is arranged on wheel dish type cover plate opposing side (1c) circumferentially, and quantity is 24 ~ 60.

3. centrifugal pump impeller according to claim 1 and 2, it is characterized in that: described centrifugal pump is single stage centrifugal pump, impeller (1) has two pieces of cover plates be oppositely arranged, and every block cover plate has the groove (1b) be arranged on opposing side (1c) respectively.

4. centrifugal pump impeller according to claim 1 and 2, is characterized in that: described centrifugal pump is multistage centrifugal pump, and impeller (1) has one piece of cover plate, and cover plate has the groove (1b) be arranged on opposing side (1c).