CN-115683262-B - Special fixture for measuring air flow of fir-tree turbine blade

Abstract

The utility model provides a measure firtree shape turbine blade air flow special fixture, belongs to firtree shape turbine blade air flow and uses frock technical field, including being used for the gland of being connected with the air flow tester, install the changeover portion in the centre bore of gland, install the sealing block in the centre bore of changeover portion, the apron that is used for compressing tightly turbine blade is installed at changeover portion top, installs the jam at turbine blade's tenon tooth divides chamber tip. The air flow clamp adopting the structure can accurately obtain the air mass flow of the internal cooling channel of the turbine blade under the condition of no air leakage so as to test the casting condition of the inner cavity of the blade and the punching condition of the air film hole and provide basis for selecting the installed blade.

Inventors

• YANG XIANZHI
• ZHANG PING
• ZHANG XIN
• Kan min
• CAO JIAMING

Assignees

• 中国航发沈阳黎明航空发动机有限责任公司

Dates

Publication Date

20260505

Application Date

20221021

Claims (6)

1. 1. The special fixture for measuring the air flow of the fir-tree turbine blade is characterized by comprising a gland which is used for being connected with an air flow tester, wherein the gland is of a disc-shaped structure with a boss at one end, a mounting hole for mounting a transfer section is formed in the center of the gland, the transfer section is of a cylindrical structure with a groove at the center, a long groove is formed in the groove bottom of the groove, a sealing block is mounted in the groove of the transfer section, and a molded surface matched with the molded surface of the tenon of the turbine blade is formed in the center of the sealing block, so that the tenon tooth of the turbine blade is wrapped in the sealing block; The top of the switching section is provided with a cover plate for pressing the turbine blade, and the end part of the tenon tooth cavity of the turbine blade is provided with a plug.
2. 2. The fixture for measuring air flow rate of fir-tree turbine blade according to claim 1, wherein the edge of the upper surface of the base of the gland is provided with a slope surface which prevents air from leaking when entering the gland.
3. 3. The fixture for measuring air flow of fir-tree turbine blades according to claim 1, wherein the upper surface of the gland boss is provided with an annular groove outside the central hole, and an O-shaped ring for sealing the joint of the gland and the adapter section is arranged in the groove.
4. 4. The fixture for measuring the air flow rate of the fir tree turbine blade according to claim 1, wherein the outer circumferential surface of the top of the cylindrical structure of the adapter section is provided with edges, and the edges are provided with connecting holes at equal intervals along the circumferential direction.
5. 5. The fixture for measuring the air flow rate of the fir-tree turbine blade according to claim 1, wherein the cover plate is circular in structure, waist-shaped holes are formed in the edge of the cover plate at equal intervals along the circumferential direction, grooves for being matched with the sealing blocks are formed in the end face of one end of the cover plate, and molded surfaces matched with contact positions of the blade edge plates are formed in the end face of the other end of the cover plate.
6. 6. A special fixture for measuring air flow of fir tree turbine blade according to claim 1, wherein said sealing block is provided with draft angle along the profile so as to be fitted into the adapter section to seal air completely.

Description

Special fixture for measuring air flow of fir-tree turbine blade Technical Field The invention belongs to the technical field of tool structures for measuring air flow of fir-tree turbine blades, and particularly relates to a special fixture for measuring air flow of fir-tree turbine blades. Background The turbine blade has complicated inner chamber structure, and the blade body is spread over the air film hole, receives multiple factor influence, adopts the mode of discharge detection to inspect blade inner chamber casting condition and air film hole condition of punching generally. However, the medium tested after the blade is installed is air, and the water flow detection value cannot truly reflect the installed state of the blade, so that the air flow detection technology becomes an important link for verifying the quality of the blade. Disclosure of Invention The invention aims to provide the special fixture for measuring the air flow of the fir tree-shaped turbine blade, and the air flow fixture adopting the structure can accurately obtain the air mass flow of the internal cooling channel of the turbine blade under the condition of no air leakage so as to test the casting condition of the inner cavity of the blade and the punching condition of the air film hole and provide a basis for selecting the installed blade. The utility model provides a measure fir shape turbine blade air flow special fixture, is including being used for the gland of being connected with air flow tester, installs the changeover portion in the centre bore of gland, installs the sealing block in the centre bore of changeover portion, and the apron that is used for compressing tightly turbine blade is installed at changeover portion top, installs the jam at turbine blade's tenon tooth divides chamber tip. The gland is a disc-shaped structure with a boss at one end, the edge of the upper surface of the base of the gland is provided with a slope surface which can prevent air from leaking when air enters the gland, and the center of the gland is provided with a mounting hole for mounting the adapter section. The upper surface of the gland boss is provided with an annular groove positioned at the outer side of the central hole, and an O-shaped ring used for sealing the joint of the gland and the switching section is arranged in the groove. The switching section is a cylindrical structure with a groove in the center, the outer circular surface of the top of the cylindrical structure is provided with edges, connecting holes are formed in the edges at equal intervals along the circumferential direction, and a long groove is formed in the bottom of the groove. The structure shape of the cover plate is circular, waist-shaped holes are formed in the edge of the cover plate at equal intervals along the circumferential direction, grooves matched with the sealing blocks are formed in the end face of one end of the cover plate, and molded surfaces matched with contact parts of the blade edge plates are formed in the end face of the other end of the cover plate. The sealing block is provided with a draft angle along the shape so as to be arranged in the switching section and can completely seal air, and the center of the sealing block is provided with a molded surface matched with the molded surface of the tenon of the turbine blade. The invention has the technical effects that: The tool structure can be applied to various turbine blade air flow tests, the disc base is suitable for various air flow testers, the sealing blocks made of oil-resistant rubber can effectively seal the surfaces of the blade pressing teeth, and the cover plate can press the blade edge plate along with the shape. The special fixture for measuring the air flow of the turbine blade is designed, and the air mass flow of the blade is accurately measured through a reasonable tool structure and a complete sealing system, so that compared with water flow measurement data, the special fixture can more meet the testing state of the blade after the blade is installed, and meets the requirement of a design department for selecting the blade installation. Drawings FIG. 1 is a three-dimensional view of a fixture for measuring air flow of a fir tree turbine blade in accordance with the present invention; FIG. 2 is a schematic cross-sectional view of a fixture for measuring air flow of a fir tree turbine blade in accordance with the present invention; FIG. 3 is a top plan view of a gland of the fixture of the present invention for measuring air flow rate of fir tree turbine blades; FIG. 4 is a schematic view of the invention in the direction A-A of FIG. 3; FIG. 5 is a top view of an adapter section of the fixture of the present invention for measuring air flow of a fir tree turbine blade; FIG. 6 is a schematic view of the B-B direction of FIG. 5 of the present invention; FIG. 7 is a schematic illustration of a cover plate of the fixture of the present invention for measuring air flow o