CN-121976858-A - Sealing device based on memory alloy

CN121976858ACN 121976858 ACN121976858 ACN 121976858ACN-121976858-A

Abstract

The embodiment of the invention discloses a sealing device based on a memory alloy, and belongs to the technical field of turbine equipment sealing. The sealing device comprises a memory alloy body, a gap detection part, a first controller, a first driving part and a plurality of sensing parts, wherein an inner ring of the memory alloy body is of a sealing structure for sealing, an outer ring of the memory alloy body is fixedly assembled with a casing, the gap detection part is used for detecting a sealing gap between the sealing structure and a sealing matching part and outputting a digital gap signal, the plurality of sensing parts are used for detecting physical parameters of a preset position of the memory alloy body, the first controller is used for outputting a first control signal according to the digital gap signal and the physical parameters and outputting a second control signal according to the physical parameters, and the first driving part is used for responding to the first control signal or the second control signal and controlling the deformation process of the sealing structure. The invention can improve the adaptability and the service life of the sealing device.

Inventors

GUO CHAOHONG
TIAN JIAHAO
ZHANG NANNAN
JIANG PENG
REN HAIKUN
ZHANG HAISONG
WANG BO
XU XIANG

Assignees

中国科学院工程热物理研究所

Dates

Publication Date: 20260505
Application Date: 20260326

Claims (10)

1. A memory alloy based sealing device for use in turbine equipment seals, said sealing device comprising: The memory alloy comprises a memory alloy body, a sealing matching component, a sealing structure, a casing, a sealing structure and a sealing structure, wherein the memory alloy body wraps the sealing matching component; A gap detection part for detecting a seal gap between the seal structure and the seal mating part and outputting a digital gap signal; The sensing components are used for detecting physical parameters of preset positions of the memory alloy body; the first controller is respectively and electrically connected with the gap detection component and the sensing components, and is used for outputting a first control signal according to the digital gap signal and the physical parameter and outputting a second control signal according to the physical parameter; The first driving component is respectively and electrically connected with the outer ring of the memory alloy body and the first controller, and is used for responding to the first control signal or the second control signal and controlling the deformation process of the sealing structure.
2. The memory alloy-based sealing device according to claim 1, wherein the seal mating member is a rotor, the seal structure is for achieving sealing in an axial direction of the rotor, the seal structure is a bent tooth structure including a plurality of bent tooth members disposed in the axial direction of the rotor; The sealing device further comprises: The adjusting component comprises a first adjusting spring and a second adjusting spring, the first adjusting spring and the second adjusting spring are arranged along the axial direction of the rotor, and the first adjusting spring and the second adjusting spring are mechanically connected with the outer ring of the memory alloy body; and the fixing piece is respectively and mechanically connected with the adjusting part and the casing.
3. The memory alloy-based sealing device according to claim 1, wherein the sealing structure is used for realizing the sealing of the radial direction of a rotor, and the sealing structure is a bent tooth-shaped structure comprising a plurality of bent tooth-shaped parts, and the plurality of bent tooth-shaped parts are arranged along the radial direction of the rotor; The sealing device further comprises: A rotor sleeve disk, wherein the rotor sleeve disk is arranged with the memory alloy body along the axial direction of the rotor and is arranged with the rotor along the radial direction of the rotor; the rotor sleeve disc is mechanically connected with the rotor, and the rotor sleeve disc is arranged on one side of the inner ring of the memory alloy body, wherein the axial direction is perpendicular to the radial direction; the wear-resistant block is mechanically connected with the rotor sleeve disc and arranged on one side of the inner ring close to the memory alloy body, wherein the wear-resistant block is used as the sealing matching part; And the sealing gasket is respectively and mechanically connected with the casing and the outer ring of the memory alloy body.
4. The memory alloy based sealing apparatus according to claim 2 or 3, wherein said sensing means comprises a temperature sensor; The temperature sensor is arranged in the memory alloy body and is electrically connected with the first controller, and the temperature sensor is used for detecting the temperature of a preset position of the memory alloy body and transmitting the temperature to the first controller; the first driving part comprises a first temperature controller; The first temperature controller is respectively and electrically connected with the first controller and the outer ring of the memory alloy body, and is used for controlling the temperature of the memory alloy body according to the first control signal or the second control signal so as to control the deformation process of the sealing structure; the first controller comprises a first main control unit, a first signal processing unit and a first temperature regulating and controlling unit; The first signal processing unit is respectively and electrically connected with the gap detection component, the first main control unit and the temperature sensors, the first temperature regulation and control unit is respectively and electrically connected with the first main control unit and the first temperature controller, or the first temperature regulation and control unit is electrically connected with the first main control unit and is connected with the first temperature controller through a fluid flow heat exchange channel; Or alternatively The sensing component comprises a Hall sensor; The Hall sensor is arranged in the memory alloy body and is electrically connected with the first controller, and the Hall sensor is used for detecting the magnetic field intensity of a preset position of the memory alloy body and transmitting the magnetic field intensity to the first controller; the first driving part includes an electromagnetic coil; The electromagnetic coil is respectively and electrically connected with the first controller and the outer ring of the memory alloy body and is used for controlling the magnetic field intensity of the memory alloy body according to the first control signal or the second control signal so as to control the deformation process of the sealing structure; the first controller comprises a second main control unit, a second signal processing unit and a current driving unit; The second signal processing unit is respectively connected with the gap detection component, the second main control unit and the Hall sensors, and the current driving unit is respectively connected with the second main control unit and the electromagnetic coil.
5. A memory alloy based sealing device according to claim 2 or 3, further comprising: the elastic compensation structure is arranged along the axial direction of the rotor with the memory alloy body and is respectively and mechanically connected with the casing and the outer ring of the memory alloy body; The first controller is also used for outputting a third control signal according to the digital clearance signal, and the second driving component is used for responding to the third control signal and controlling the position of the memory alloy body; Or alternatively The sealing device further comprises: the elastic compensation structure is arranged along the axial direction of the rotor with the memory alloy body and is respectively and mechanically connected with the casing and the outer ring of the memory alloy body; The third driving component is electrically connected with the casing and the second controller respectively, and the second controller is connected with the gap detection component; the second controller is further used for outputting a fourth control signal according to the digital gap signal, and the third driving component is used for responding to the fourth control signal and controlling the position of the memory alloy body.
6. The memory alloy based seal according to claim 5, wherein said elastic compensation structure comprises: the first elastic component is arranged in the first mounting hole of the casing; The second elastic component and the third elastic component are arranged along the radial direction of the rotor and are respectively and mechanically connected with the first elastic component and the outer ring of the memory alloy body; the second driving part comprises a second temperature controller; The second temperature controller is respectively and electrically connected with the first controller and the casing, and is used for controlling the temperature of the casing according to the third control signal so as to control the position of the memory alloy body; the third driving part comprises a third temperature controller; the third temperature controller is respectively and electrically connected with the second controller and the casing, and is used for controlling the temperature of the casing according to the fourth control signal so as to control the position of the memory alloy body; the second controller comprises a third main control unit, a third signal processing unit and a second temperature regulating and controlling unit; The third signal processing unit is respectively and electrically connected with the gap detection part and the third main control unit, the second temperature regulation and control unit is respectively and electrically connected with the third main control unit and the third temperature controller, or the second temperature regulation and control unit is electrically connected with the third main control unit and is connected with the third temperature controller through a fluid flow heat exchange channel.
7. The memory alloy based seal according to claim 6, wherein the structures of the first, second and third elastic members are memory alloy structures or spring structures; When the structures of the first elastic component, the second elastic component and the third elastic component are memory alloy structures, deformation conditions of at least two of the memory alloy body, the first elastic component, the second elastic component and the third elastic component are different.
8. The memory alloy based sealing device according to claim 1, wherein the memory alloy body is provided with a plurality of second mounting holes for mounting a plurality of the sensing members; The memory alloy body is provided with an avoidance groove for mounting the gap detection component.
9. The memory alloy based seal according to claim 1, wherein said gap detection component comprises an eddy current sensor; the eddy current sensor is connected with the first controller.
10. The memory alloy-based sealing device of claim 1, wherein the sealing structure is one of a curved toothed structure, a cylindrical structure, a needle structure, a mesh structure, or a honeycomb structure; the memory alloy is Ni-Ti series shape memory alloy or copper-based shape memory alloy.

Description

Sealing device based on memory alloy Technical Field The invention relates to the technical field of turbine equipment sealing, in particular to a sealing device based on memory alloy. Background The supercritical carbon dioxide (sCO 2) turbine machinery has high operating pressure, usually up to 20MPa, and has high requirements on sealing. At present, dry gas sealing and tabletting type sealing are mainly adopted for the high-pressure turbine shaft sealing technology in the industry, however, when the technology is applied to supercritical carbon dioxide ventilation, the whole control logic of the dry gas sealing is complex, the sealing effect is reduced due to the increase of gaps after the tabletting type sealing is worn, and the adaptability and the service life of a sealing device are affected. Disclosure of Invention The invention provides a sealing device based on a memory alloy, which solves the technical problems of complex operation and control of the existing supercritical carbon dioxide turbine dry gas seal and reduced sealing effect caused by increased clearance after compression seal abrasion, and improves the adaptability and service life of the sealing device. According to an aspect of the present invention, there is provided a memory alloy based sealing device for use in turbine plant sealing, the sealing device comprising: The memory alloy comprises a memory alloy body, a sealing matching component, a sealing structure, a casing, a sealing structure and a sealing structure, wherein the memory alloy body wraps the sealing matching component; A gap detection part for detecting a seal gap between the seal structure and the seal mating part and outputting a digital gap signal; The sensing components are used for detecting physical parameters of preset positions of the memory alloy body; the first controller is respectively and electrically connected with the gap detection component and the sensing components, and is used for outputting a first control signal according to the digital gap signal and the physical parameter and outputting a second control signal according to the physical parameter; The first driving component is respectively and electrically connected with the outer ring of the memory alloy body and the first controller, and is used for responding to the first control signal or the second control signal and controlling the deformation process of the sealing structure. The sealing structure is a bent tooth-shaped structure, and the bent tooth-shaped structure comprises a plurality of bent tooth-shaped parts which are arranged along the axial direction of the rotor; The sealing device further comprises: The adjusting component comprises a first adjusting spring and a second adjusting spring, the first adjusting spring and the second adjusting spring are arranged along the axial direction of the rotor, and the first adjusting spring and the second adjusting spring are mechanically connected with the outer ring of the memory alloy body; and the fixing piece is respectively and mechanically connected with the adjusting part and the casing. The sealing structure is a bent tooth-shaped structure, the bent tooth-shaped structure comprises a plurality of bent tooth-shaped parts, and the bent tooth-shaped parts are arranged along the radial direction of the rotor; The sealing device further comprises: A rotor sleeve disk, wherein the rotor sleeve disk is arranged with the memory alloy body along the axial direction of the rotor and is arranged with the rotor along the radial direction of the rotor; the rotor sleeve disc is mechanically connected with the rotor, and the rotor sleeve disc is arranged on one side of the inner ring of the memory alloy body, wherein the axial direction is perpendicular to the radial direction; the wear-resistant block is mechanically connected with the rotor sleeve disc and arranged on one side of the inner ring close to the memory alloy body, wherein the wear-resistant block is used as the sealing matching part; And the sealing gasket is respectively and mechanically connected with the casing and the outer ring of the memory alloy body. Optionally, the sensing component comprises a temperature sensor; The temperature sensor is arranged in the memory alloy body and is electrically connected with the first controller, and the temperature sensor is used for detecting the temperature of a preset position of the memory alloy body and transmitting the temperature to the first controller; the first driving part comprises a first temperature controller; The first temperature controller is respectively and electrically connected with the first controller and the outer ring of the memory alloy body, and is used for controlling the temperature of the memory alloy body according to the first control signal or the second control signal so as to control the deformation process of the sealing structure; the first controller comprises a first main control unit, a first signal