CN211975262U

CN211975262U - Embedded impulse turbine runner

Info

Publication number: CN211975262U
Application number: CN202020591296.XU
Authority: CN
Inventors: 梁权伟; 谢可为; 万兵; 胡江艺; 汪刚; 周恒特; 付封旗
Original assignee: Dongfang Electric Machinery Co Ltd DEC
Current assignee: Dongfang Electric Machinery Co Ltd DEC
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2020-11-20
Anticipated expiration: 2030-04-20

Abstract

The utility model discloses an embedded impulse turbine runner, belonging to the technical field of hydraulic mechanical equipment, comprising a wheel disc and a bucket group uniformly distributed around the wheel disc, wherein the root of each bucket of the bucket group is provided with a connecting block, the periphery of the wheel disc is provided with a clamping groove corresponding to each connecting block, and the inner diameter of the bottom of the clamping groove is larger than that of the outer port of the clamping groove; the connecting block is integrally embedded into the clamping groove, the root of the connecting block is in contact with the wheel disc, and the positioning connecting piece is arranged on the inner side of the wheel disc and radially fixes the connecting block. The runner passes through the negative angle connecting block of rim plate draw-in groove and bucket root, and the rethread bolt is fixed a position, inlays the bucket, improves the root atress condition of impulse turbine runner at operation in-process bucket to the realization is optimized the bucket root atress.

Description

Embedded impulse turbine runner

Technical Field

The utility model relates to an impact runner, concretely relates to inlay type impulse turbine runner.

Background

The characteristics of the stress condition of the runner of the impulse turbine are key factors related to the stable operation and the service life of the impulse turbine. The existing impulse turbine runner is composed of a wheel disc and a bucket, and the structure of the existing impulse turbine runner mainly has three forms:

an integral runner which is simplest in structure, has high strength, safe and reliable operation and light weight, but has the problems of extremely complicated casting process, high requirement on casting technology level, high manufacturing cost, difficult surface processing of water buckets due to dense arrangement of the water buckets, and the fact that the whole runner must be replaced when one water bucket is damaged or broken.

The combined runner, its water bucket and wheel disk are made separately, then connected together by bolt, it has the characteristics of simplifying casting process and low requirement for casting equipment, but it is not as firm and reliable as the whole cast runner, for example, the Chinese patent publication with publication No. CN107091263A, named as "water bucket runner" in the prior art discloses a water bucket runner related to the bucket runner with wheel disk and separately made scoop (2), its technical scheme is: the scoop (2) can be cast or made of a solid block material and is removably fixed to the wheel disc (1) by means of at least one screw (5) or at least one bolt fastening; each scoop is engaged to the wheel disk in a form-locking connection by at least one shear bush aligned in the radial direction with the rotational axis of the wheel disk and/or by further shear pins aligned in the radial direction with the rotational axis. This patent closes the bucket on the rim plate through the bolt, and the tangential force of water jet is born by shearing round pin or bush, but the centrifugal force of runner rotation in-process is born by the screw, and when the connecting piece is defective, can take place the connecting piece fracture under fluidic frequent impact, leads to the serious accident of disconnected fill then, threatens personal and equipment safety.

The water bucket and the wheel disc of the cast-weld type runner are respectively cast and then welded together, the cast-weld type runner has the advantages of a combined runner, the defect that the combined structure of the combined runner weakens the strength of the root is avoided, the strength is not worse than that of a whole cast structure, but the welding technical requirement is high.

Due to the fact that the working conditions are severe, the impact type rotating wheel with the three structural formulas can have a serious accident that the water bucket of the rotating wheel is broken. At present, the technical means commonly adopted on the problem of bucket breakage prevention of the impulse turbine runner in China is as follows: the good manufacturing process is adopted, casting defects are avoided, and machining and welding residual stress is eliminated; product detection is enhanced, and manufacturing defects are found in advance; the fatigue crack is found in advance by regular detection in use, and the fracture is avoided. However, these techniques result in low material utilization, high processing cost and long manufacturing cycle.

Disclosure of Invention

The utility model discloses aim at solving the above-mentioned problem that the impacted style runner exists among the prior art, provide an inlay type impacted style hydraulic turbine runner, this runner passes through the negative angle connecting block of rim plate draw-in groove and bucket root, fixes a position through the bolt to this improves impacted style hydraulic turbine runner at the operation in-process, bucket root atress condition, thereby realizes optimizing bucket root atress.

In order to achieve the above purpose, the technical solution of the present invention is as follows:

the utility model provides a inlay type impulse turbine runner, includes rim plate and evenly distributed bucket group around the rim plate, its characterized in that: the root of each water bucket of the water bucket group is provided with a connecting block, the periphery of the wheel disc is provided with a clamping groove corresponding to each connecting block, and the inner diameter of the bottom of each clamping groove is larger than that of the outer port of each clamping groove; the connecting block is integrally embedded into the clamping groove, the root of the connecting block is in contact with the wheel disc, and the positioning connecting piece is arranged on the inner side of the wheel disc and radially fixes the connecting block.

Furthermore, the clamping grooves penetrate through two end faces of the wheel disc, so that the periphery of the wheel disc is in a gear shape; the included angle alpha between the two clamping surfaces of each clamping groove and the plane where the groove bottom is located is smaller than 90 degrees.

Further, the connecting block is fixedly connected with the water bucket in an integrated mode.

Furthermore, the positioning connecting piece is a positioning bolt, and the positioning bolt is screwed in from the inner side of the wheel disc in the radial direction to fix and lock the connecting block and the wheel disc.

The utility model has the advantages that:

1. the runner, through the negative angle connecting block of rim plate draw-in groove and bucket root, the rethread bolt is fixed a position, inlays the bucket, improves the root atress condition of impulse turbine runner at operation in-process bucket to the realization is optimized the bucket root atress.

2. Runner, its geometric characteristics can be handled by the rim plate in all introducing the rim plate with radial centrifugal force and tangential force when moving, make the unit atress more even at operation in-process, avoided root high stress area, reduced the fracture risk of bucket.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic structural view of the wheel disc of the present invention;

fig. 3 is a schematic structural view of the bucket of the present invention;

wherein,

1. rim plate, 2, hopper, 3, draw-in groove, 4, positioning bolt, 5, connecting block, 6, bolt hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "vertical", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the utility model is usually placed when using, or the orientation or positional relationship that a person skilled in the art usually understands, only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

This embodiment is the most basic embodiment.

The embodiment provides a mosaic type impulse turbine runner as shown in fig. 1, which comprises a wheel disc 1 and water bucket 2 groups uniformly distributed around the wheel disc 1, wherein the root of each water bucket 2 of the water bucket 2 groups is provided with a connecting block 5, the periphery of the wheel disc 1 is provided with a clamping groove 3 corresponding to each connecting block 5, and the inner diameter of the bottom of each clamping groove 3 is larger than the inner diameter of the outer port of each clamping groove 3; the whole connecting block 5 is embedded into the clamping groove 3, the root of the connecting block 5 is in contact with the wheel disc 1, and the inner side of the wheel disc 1 is provided with a positioning connecting piece for radially fixing the connecting block 5.

Example 2

The embodiment provides a mosaic type impulse turbine runner as shown in fig. 1, which comprises a wheel disc 1 and water bucket 2 groups uniformly distributed around the wheel disc 1, wherein the roots of the water buckets 2 of the water bucket 2 groups are respectively provided with a connecting block 5, the periphery of the wheel disc 1 is respectively provided with a clamping groove 3 corresponding to each connecting block 5, as shown in fig. 2, the clamping grooves 3 penetrate through two end faces of the wheel disc 1, so that the periphery of the wheel disc 1 is in a gear shape, the included angle alpha between two clamping faces of each clamping groove 3 and the plane where the groove bottom is located is smaller than 90 degrees, preferably, the angle of the two clamping faces, which is deviated from the direction perpendicular to the groove bottom, is 2-10 degrees, and more preferably 2-5 degrees; in 5 whole embedding draw-in grooves 3 of connecting block, the root of connecting block 5 contacted with rim plate 1, all was equipped with corresponding bolt hole 6 on rim plate 1 and the connecting block 5, positioning bolt 4 radially twists with connecting block 5 and rim plate 1 fixed locking from 1 inboard of rim plate.

Further, as shown in fig. 3, the connecting block 5 and the water bucket 2 are of an integrally formed structure.

This embodiment the runner passes through 1 draw-in groove 3 of rim plate and 2 root negative angle connecting block 5 of bucket, and the rethread bolt is fixed a position, inlays bucket 2, and this geometric characteristics can all introduce rim plate 1 with radial centrifugal force and tangential force when the runner moves in, is handled by rim plate 1, has improved impulse turbine runner at the root atress condition of operation in-process bucket 2, has optimized 2 root atress of bucket, has reduced the fracture risk of bucket 2.

Claims

1. The utility model provides a inlay type impulse turbine runner, includes rim plate (1) and evenly distributed bucket (2) group around rim plate (1), its characterized in that: the root parts of the water hoppers (2) of the water hopper (2) group are provided with connecting blocks (5), the periphery of the wheel disc (1) is provided with a clamping groove (3) corresponding to each connecting block (5), and the inner diameter of the bottom of each clamping groove (3) is larger than that of the outer port of each clamping groove (3); the connecting block (5) is integrally embedded into the clamping groove (3), the root of the connecting block (5) is in contact with the wheel disc (1), and the inner side of the wheel disc (1) is provided with a positioning connecting piece for radially fixing the connecting block (5).

2. The runner for a mosaic impulse turbine as defined in claim 1, wherein: the clamping grooves (3) penetrate through two end faces of the wheel disc (1), so that the periphery of the wheel disc (1) is in a gear shape; the included angle alpha between the two clamping surfaces of each clamping groove (3) and the plane where the groove bottom is located is smaller than 90 degrees.

3. A mosaic impulse turbine runner according to claim 1 or 2, wherein: the connecting block (5) is fixedly connected with the water bucket (2) in an integrated manner.

4. A mosaic impulse turbine runner according to claim 3, wherein: the positioning connecting piece is a positioning bolt (4), and the positioning bolt (4) is screwed in from the inner side of the wheel disc (1) in the radial direction to fix and lock the connecting block (5) and the wheel disc (1).