CN217206706U

CN217206706U - Spiral case of water turbine

Info

Publication number: CN217206706U
Application number: CN202220379010.0U
Authority: CN
Inventors: 王育才; 刘杰; 唐杰天
Original assignee: Chongqing Water Turbine Works Co Ltd
Current assignee: Chongqing Water Turbine Works Co Ltd
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2022-08-16
Anticipated expiration: 2032-02-24

Abstract

The utility model relates to a hydraulic turbine technical field discloses a hydraulic turbine spiral case, including spiral case, spiral case water inlet, seat ring sum top cap, the spiral case is connected with seat ring extension, the top cap is located seat ring upper portion, its characterized in that, spiral case water inlet installation head, set up the pressure testing water inlet on the head, form passageway and intercommunication between seat ring and the top cap the spiral case, and form sealed chamber with the spiral case, can do the pressure testing alone experimental, and what simulate is the pressure-bearing condition of spiral case and stator under true operating condition.

Description

Spiral case of water turbine

Technical Field

The utility model relates to a hydraulic turbine technical field specifically is a hydraulic turbine spiral case.

Background

The volute is one of important components of the water turbine, and is used for guiding water flow, and guiding water flow to the water guiding mechanism in a uniform and symmetrical manner with small head loss, and entering the runner, for example, document CN204212908U discloses a mixed-flow water turbine, which comprises components such as a main runner, a volute component, a main shaft, and the like, wherein the volute component mainly comprises a volute, a volute water inlet, a bottom ring, a top cover and a runner cavity, the top cover and the bottom ring are arranged in the middle of the volute, the runner cavity is arranged between the top cover and the bottom ring, and the main runner is arranged in the runner cavity and forms a closed channel with the volute water inlet in the operation process.

According to the above documents, the volute is bound to bear the pressure of water in the operation process, so that a pressure test needs to be carried out before the volute operates normally, while the conventional high-water-head project volute is subjected to strength pressure test on site, the volute section generates larger expansion deformation under the action of water pressure, and larger acting force is applied to the fixed guide vane, so that the stress value is higher, exceeds the allowable stress value of materials, plastic deformation is easy to generate, and the safety and stability of project construction pressure test and operation are affected, so that the pressure test needs to be carried out in advance before the volute is installed on site, and the volute does not have the pressure test condition.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a hydraulic turbine spiral case to realize the independent pressure testing of spiral case.

In order to achieve the purpose, the utility model provides a water turbine spiral case, including spiral case, spiral case water inlet, seat ring and top cap, the spiral case is connected with seat ring extension, the top cap is located seat ring upper portion, its characterized in that, spiral case water inlet installation head, set up the pressure testing water inlet on the head, form passageway and intercommunication between seat ring and the top cap the spiral case, and form sealed chamber with the spiral case.

Preferably, in order to facilitate pressure test of the volute, the seat ring and the top cover are sealed, a cylinder is arranged between the seat ring and the top cover, and the cylinder seals the channel.

In order to improve the sealing performance of the cylinder, the joint of the cylinder, the seat ring and the top cover is sealed.

Preferably, the real environment is simulated, the structural bearing strength of the multi-component connection in the actual operation process of the water turbine is detected, guide vanes are inserted into the seat ring and the top cover, and the middle parts of the guide vanes are located in the sealing cavities.

In order to guarantee the stability of the guide vane bearing, a bottom ring is arranged on the seat ring, and the guide vane and the cylinder body are simultaneously supported by the bottom ring.

In order to improve the sealing performance between the guide vanes and the bottom ring and the top cover, the joints of the guide vanes and the bottom ring and the top cover are sealed.

Further, form the absolute seal of stator, stator upper portion is equipped with the sleeve, the sleeve upper and lower part sets up the axle sleeve respectively, just the sleeve with the sealed processing of stator junction.

Has the beneficial effects that: the volute of the utility model can be used for carrying out pressure test independently without being mounted on a water turbine, and the pressure-bearing condition of the volute and the guide vane under the real working state is simulated; meanwhile, the sealing and pressure-bearing conditions of the volute, the guide vane, the seat replacement, the bottom ring and the top cover are detected, so that the defects of water leakage, deformation and the like are more intuitively discovered; the top cover and the bottom ring are respectively arranged on the seat ring and fixed, when the volute section pressure test expansion deformation generates larger acting force on the guide vane, the top cover and the bottom ring play a role in restraining the guide vane in opposite directions, and the acting force generated by the volute section pressure test expansion deformation on the guide vane can be well resisted, so that the guide vane can not exceed the allowable stress value of a material due to the volute section expansion stress during strength pressure test, and the safety and the stability during pressure test are ensured.

Drawings

FIG. 1 is a schematic view of the internal structure of a volute of a water turbine;

FIG. 2 is a schematic view of a turbine volute;

FIG. 3 is a schematic view of the seat ring of FIG. 1;

FIG. 4 is a schematic view of the volute of FIG. 1;

FIG. 5 is a schematic structural view of the bottom ring of FIG. 1;

FIG. 6 is a schematic structural view of the guide vane of FIG. 1;

FIG. 7 is a schematic structural view of the cartridge of FIG. 1;

FIG. 8 is a schematic structural view of the top cover of FIG. 1;

fig. 9 is a schematic view of the sleeve of fig. 1.

Reference numerals are as follows: 1. a volute; 2. a volute water inlet; 3. a seat ring; 4. a bottom ring; 5. a top cover; 6. sealing the end; 7. a barrel; 8. a sealing strip; 9. a guide vane; 10. a guide vane lower shaft sleeve; 11. a sleeve; 12. a shaft sleeve; 13. a seal ring; 14. the chamber is sealed.

Detailed Description

The following describes the embodiments of the present invention in further detail with reference to the drawings, but the present invention is not limited to these embodiments, and the modifications made to the present invention are also within the scope of the claims of the present invention without departing from the principles of the present invention.

Example 1

As shown in fig. 1, a water turbine volute comprises a volute 1, a volute water inlet 2, a seat ring 3, a bottom ring 4, a top cover 5, a seal head 6 and a barrel 7, wherein the volute 1 and the seat ring 3 are formed by welding, a seal groove is formed in the seat ring 3, the seal groove is sealed by a seal strip 8, the top cover 5 is arranged on the upper portion of the seat ring 3, the bottom ring 4 and the barrel 7 are located between the seat ring 3 and the top cover 5, the bottom ring 4 is fixedly connected to the seat ring 3 through bolts, the barrel 7 is arranged on the bottom ring 4, the barrel wall of the barrel 7 seals a channel between the seat ring 3 and the top cover 5, so that the volute 1 is sealed, the seal head 6 is installed on the volute water inlet 2, and a pressure test water inlet is formed in the seal head 6, so that a seal cavity 14 is formed between the seat ring 3, the top cover 5 and the volute 1.

And the upper part and the lower part of the cylinder body 7 are simultaneously provided with sealing strips 8, so that the integral sealing performance is ensured.

The socket joint has stator 9 on seat ring 3 and the top cap 5, install axle sleeve 10 under the stator on the end ring 4, stator 9 is sealed to be adorned under the stator on the axle sleeve 10, end ring 4 supports stator 9, stator 9 middle part is located in the sealed chamber 14.

The guide vane 9 is respectively provided with a sealing strip 8 at the joint of the bottom ring 4 and the top cover 5, so that the sealing performance is ensured.

Guide vane 9 upper portion is equipped with sleeve 11, sleeve 11 upper and lower part sets up axle sleeve 12 respectively, just sleeve 11 with the inner wall and the outer wall of guide vane 9 junction all set up sealing washer 13, guide vane 9 forms absolute seal.

Specifically, installation and pressure test:

1) assembling and welding the volute 1 and the seat ring 3 for molding;

2) a sealing groove in the seat ring 3 is filled with a sealing strip 8, then the sealing strip is hung into the bottom ring 4 and is fixed through screws;

3) installing the guide vane lower shaft sleeve 10 into the bottom ring 4;

4) after the guide vanes 9 are sealed, the guide vanes are hung into the bottom ring lower shaft sleeve 12;

5) after the upper part and the lower part of the cylinder 7 are provided with the sealing strips 8, the whole cylinder is hung on the bottom ring 4 and is stably fixed;

6) the top cover 5 penetrates through the guide vane 9 and is hung into the seat ring 3 to be adjusted in position;

7) after the sleeve 11, the shaft sleeve 12 and the sealing strip 8 are assembled, the sleeve, the shaft sleeve and the sealing strip are fixed on the top cover 5 through bolts;

8) fastening the top cover 5 to the seat ring 3 by bolts;

9) welding and fixing the end socket 6 and the volute water inlet 2 to form the sealed cavity 14;

10) and a pressure test pump is connected to the end socket 6, and water is filled and pressurized to complete pressure test of the volute 1.

Claims

1. The utility model provides a hydraulic turbine spiral case, includes spiral case (1), spiral case water inlet (2), seat ring (3) and top cap (5), spiral case (1) is connected with seat ring (3) extension, top cap (5) are located seat ring (3) upper portion, its characterized in that: the volute casing water inlet (2) is provided with a seal head (6), the seal head (6) is provided with a pressure test water inlet, a channel is formed between the seat ring (3) and the top cover (5) and communicated with the volute casing (1), and a sealed cavity (14) is formed between the seat ring and the top cover (5) and communicated with the volute casing (1).

2. The turbine volute of claim 1, wherein: a cylinder (7) is arranged between the seat ring (3) and the top cover (5), and the cylinder (7) seals the channel.

3. The turbine volute of claim 2, wherein: and the joint of the cylinder (7) and the seat ring (3) and the top cover (5) is subjected to sealing treatment.

4. The turbine volute of claim 3, wherein: the guide vane (9) is inserted on the seat ring (3) and the top cover (5), and the middle part of the guide vane (9) is positioned in the sealing cavity (14).

5. The turbine volute of claim 4, wherein: the base ring (3) is provided with a bottom ring (4), and the guide vane (9) and the cylinder body (7) are simultaneously supported by the bottom ring (4).

6. The turbine volute of claim 5, wherein: and sealing the connection part of the guide vane (9) and the bottom ring (4) and the top cover (5).

7. The turbine volute of any of claims 4-6, wherein: guide vane (9) upper portion is equipped with sleeve (11), sleeve (11) upper and lower part sets up axle sleeve (12) respectively, just sleeve (11) with guide vane (9) junction sealing treatment.