RU190999U1 - WORKING WHEEL CENTRIFUGAL PUMP - Google Patents

Abstract

The invention relates to pump engineering, in particular, to the design of centrifugal wheels for pumps for liquids and can be used to create centrifugal wheels of a closed type in pumps for various purposes in chemical, petroleum and other industries. The centrifugal pump impeller contains the main disk 1, which is integral with blades 2, for example, performed by milling on a machine with numerical control (CNC). The blades and the disk form the interscapular channels 3, available for polishing surfaces in order to improve the efficiency of the wheel and, consequently, the pump. To exclude the flow of the working medium through the tops of the blades to the tops of the blades, a funnel-shaped covering disk 4 is installed in the form of a separate part that has surfaces available for polishing. Installing the cover disk allows you to further improve the efficiency of the wheel, but this disk should be fixed on the blades. The grooves are made rectilinear with the help of a disk cutter installed at an angle to the tangent drawn to the circumference of the disk - this is the simplest technology option requiring a universal milling machine. The grooves, if necessary, can be curvilinear - in the form of a circular arc, and they can be performed with a “finger” cutter on a copier or on a CNC machine. After the welds are completed, the material protrusions of the welds are cut off by machining. grooves and welding in these grooves additional plates 7 (blades 8) is to remove restrictions on the width "B" of the wheel on the outer diameter - where welding may be unavailable due to the small distances between the discs.4 h. P. f-ly, 2 ill.

Description

The utility model relates to pump engineering, in particular, to the design of centrifugal wheels of pumps for liquids and can be used to create centrifugal wheels of a closed type in pumps for various purposes in the chemical, petroleum and other industries.

A centrifugal wheel of a closed type is known, which contains a hub with a main disk on which there are blades and a driven (top) disk that prevents the working medium (for example, liquid) from flowing from one side of the blade to the other (see, for example, utility model patent No. 93899, F04D 1/00)

The closed-type impeller has a higher efficiency than the open-type impeller - without a driven (cover) disk.

However, the cover disk greatly complicates the manufacture of channels between the blades, in the manufacture of casting the impeller during milling, which forces the blades to thicken. Closed channels are difficult for thin blades, difficult to process in order to reduce the roughness of the surfaces forming interscapular channels.

Known impeller composite (team) design, in which the hub, the main disk and the blades are made at the same time whole - for example, by milling, and the covering disk is performed as a separate part.

At the same time, the blades are welded to the covering disk, and the welds are made on the convex part of the blades in the form of fillets connecting the part of the blade with the covering disk and located between the output edges of the blades (see the decision on issuing a patent for a useful model on application No. 2014134374 (056517 ), the filing date of the application is September 27, 201)

A disadvantage of the known technical solution is the inaccessibility of the place to perform the weld at small (less than 15 mm) distances between the main and top disk, as well as the difficulty of quality control of the alloying of the blade and the disc with blade thicknesses of 2.5 ... 3 mm and the difficulty of removing the unevenness of the weld in interscapular channel.

FIG. 1 shows a longitudinal (along the wheel axis) section of the impeller, and FIG. 2 views of the grooves in the disks rectilinear and curvilinear, where:

1 - main disk

2 - blades

3 - interscapular channels

4 - top disk

5, 6 - through grooves in the disks

7 - plates

8 - additional blades

9 - curved plates

10 - curved additional blades

11, 12 - the ends of the plate

13, 15 - weld material

14 - chamfer on the edge of the groove

16 - chamfer on the end of the plate

β ₂ - the angle at the exit of the impeller

β is the width of the wheel on the outer diameter.

The impeller of the centrifugal pump contains the main disk 1, made integral with the blades 2, for example, performed by milling on a machine with numerical control (CNC). The blades and the disc form interscapular channels 3, available for polishing surfaces in order to improve the efficiency of the wheel and, consequently, the pump. To prevent overflowing of the working medium through the tops of the blades, a funnel-shaped covering disk 4 is installed on the tops of the blades in the form of a separate part, which has surfaces available for polishing. Installing the cover disk allows you to further improve the efficiency of the wheel, but this disk should be fixed on the blades.

For the purpose of fastening the disks 1 and 4, the through grooves 5 starting from the outer diameter of both disks are made in the covering disk 4 and the grooves 6 in the main disk. The grooves are made straight with a disk cutter mounted at an angle β ₂ to the tangent drawn to the disk circumference - this is the simplest version of the technology that requires a universal milling machine. The grooves, if necessary, can be curvilinear - in the form of an arc of a circle, and they can be performed with a “finger” cutter on a copier or on a CNC machine.

In the manufacture of grooves 5 and 6 are flat plates 7, forming additional blades 8 or curved 9 of the sheet material additional blades 10.

Additional blades in some cases may be flat for the reason that the curvature of the profile of the blade when approaching the outer diameter of the wheel is often absent.

The ends 11 and 12 of the plate 7 of the additional blades 8 are placed in the through grooves 5 and 6 of the disks 1 and 4 are welded to the disks by filling the grooves with the material of the welds. To improve the reliability of the edges of the grooves on the outer side of the discs, with respect to the interscapular channels, chamfers 14 are made, filled with material of welds 13 and 15. If the additional blades are made with a thickness of about 5-6 mm, then chamfer 16 is more expedient to perform at the ends 11 12 plates - it is easier and it can be done on a grinding machine.

After performing the welds, the protrusions of the material of the welds are cut off by machining.

The positive effect of making the grooves and welding in these grooves additional plates 7 (blades 8) is to remove restrictions on the width "B" of the wheel on the outer diameter - where welding may not be available due to the small distances between the discs.

Another positive effect is the convenience of monitoring the welding places, especially for thin additional blades 7, 8 made of 1.5 ... 2.5 mm thick sheet, when it is easier to control the fusion of the plate with the disk from the outside of the disk and the probability of the welded material to fall is reduced. a seam (in the form of a pro-melt) into the interscapular channels.

Claims (5)

1. The impeller of the centrifugal pump containing the main disk, integral with the blades, forming interblade channels and a funnel-shaped covering disk as a separate part in contact with the tips of the blades, characterized in that in the main and covering disks between the blades of the main disk the through grooves beginning from the outer diameter of both disks, in which additional blades of sheet material are placed, the ends of each of these blades are welded to both the main and pok yvnym disk, wherein the welds are located on the outside with respect to the interblade channels of each disc. 2. The impeller of the centrifugal pump under item 1, characterized in that the additional blades are made flat, and the grooves are made in the form of straight slots. 3. The impeller of the centrifugal pump under item 1, characterized in that the chamfers filled with the material of welds are made on the ends of the plates placed in the disc grooves. 4. The impeller of the centrifugal pump under item 1, characterized in that the additional blades are made curvilinear, and the grooves are made in the form of an arc of a circle. 5. The impeller of the centrifugal pump under item 1, characterized in that chamfers filled with material of welds are made on the edges of the grooves on the outside of the discs, in relation to the interscapular channels.

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