A foil end face gas film seal structure with actively controllable foil inclination angle

Abstract

A foil end face gas film seal structure with actively controllable foil inclination angle, comprising a moving ring and a stationary ring of the gas film seal; characterized in that at least one of the moving ring or the stationary ring is a foil end face seal ring; the foil end face seal ring includes a foil end face regulation component, a cam disc, a ring body, an electromagnetic drive component and a bolt group; the foil end face regulation component includes a foil, a foil fixing seat, a foil mounting ring and a spring; the foil is elastically connected to the foil fixing seat, and the foil fixing seats are uniformly arranged circumferentially along the foil mounting ring; a plurality of magnets are uniformly arranged along the circumferential direction on the inner diameter side of the cam disc, and under the action of the magnetic field of the coil, the cam disc is controlled to rotate relative to the ring body, so that the inclination angle of the foil changes along with the change of the cam contact surface.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical end face seal structure design, and particularly relates to a foil end face gas film seal structure with an actively controllable foil inclination angle, which is particularly suitable for the shaft end seal devices of various high-speed rotating machines. Background Art

[0002] End face gas film seal is a new type of mechanical seal used for the shaft end seal of high-speed rotating machines, and has significant performance advantages of low leakage and long life. Currently, the traditional end face gas film seal is a dry gas seal, and the existing dry gas seal technology is prone to instability under high-speed or variable working conditions, resulting in end face deformation and further causing seal failure.

[0003] When the working conditions of the foil end face gas film seal structure change or it is disturbed by the outside world, it can achieve a small range of change in the film thickness and reach dynamic equilibrium. In the prior art, the inclination angle of the foil ramp area is a fixed value, and when facing different working conditions or being disturbed by the outside world, the foil inclination angle cannot be actively adjusted. However, in engineering practice, the working conditions of rotating machines are complex and variable. When the gas film pressure changes greatly, the seal device cannot be self-regulated, the seal performance is poor, and even leakage may occur. Summary of the Invention

[0004] The present invention aims to solve the problems of the above-mentioned traditional dry gas seal and foil end face gas film seal, and provides a foil end face gas film seal structure with an actively controllable foil inclination angle.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A foil end face gas film seal structure with an actively controllable foil inclination angle, including a dynamic ring and a static ring of the gas film seal; characterized in that:

[0007] At least one of the dynamic seal ring or the static seal ring is a foil face seal ring; the foil face seal ring includes a foil face regulating component, a cam disc, a ring body, an electromagnetic driving component and a bolt group; the foil face regulating component includes a foil, a foil fixing seat, a foil mounting ring and a spring; a first spring fixing groove is provided on the foil, a second spring fixing groove and a photoelectric sensor are provided on the foil fixing seat, one end of the spring is fixed in the first spring fixing groove, and the other end is fixed in the second spring fixing groove, so that the foil is elastically connected to the foil fixing seat; the foil fixing seat is connected to the foil mounting ring by mortise and tenon joints, the foil fixing seats are evenly arranged along the circumference of the foil mounting ring, the foils are evenly arranged in the circumferential direction, and a plurality of first threaded holes are evenly provided on the foil mounting ring along the circumferential direction; a plurality of magnets are evenly arranged along the circumferential direction on the inner diameter side of the cam disc, a plurality of limiting notch openings are evenly provided on the cam disc along the circumferential direction, the cam disc is provided with a foil face regulating component mounting groove, and the surface of the foil in contact with the cam disc is set as a cam contact surface; the ring body is provided with a cam disc mounting groove and an electromagnetic driving component mounting groove, a plurality of first through holes and second threaded holes are evenly provided on the ring body along the circumferential direction, and the ring body is provided with a sealing dam; the electromagnetic driving component includes a coil base and coils, and a plurality of coils are evenly arranged along the circumferential direction on the inner diameter side of the coil base, and a plurality of second through holes are evenly provided on the outer diameter side of the coil base along the circumferential direction; the foil mounting ring is placed in the foil face regulating component mounting groove, the cam disc is placed in the cam disc mounting groove, the bolt group includes a plurality of first bolts and a plurality of second bolts, the first bolts connect the foil mounting ring and the ring body through the first through holes, the limiting notch openings and the first threaded holes, and the second bolts fix the electromagnetic driving component in the ring body through the second through holes and the second threaded holes; the foil is tightly attached to the cam contact surface under the pulling force of the spring.

[0008] As a preferred technical solution, the coils control the magnetic field action intensity, time or direction by connecting different magnitudes of voltage or sequentially changing the energization time or direction of adjacent coils; under the magnetic field action of the coils, the magnets control the relative rotation of the cam disc and the ring body, and further cause the inclination angle of the foil to change along the change of the cam contact surface.

[0009] As a preferred technical solution, the foil includes a flat foil and a cylindrical foil, the flat foil is connected to the cylindrical foil by welding, and the cylindrical foils are evenly arranged below the flat foil along the circumferential direction.

[0010] As a preferred technical solution, the cam contact surface includes a plurality of concave curved surfaces and flat surfaces evenly arranged in the circumferential direction. The number of the concave curved surfaces is an integer multiple of the number of the foils. The variation range of the inclination angle of the foils under the rotation of the cam disc is 0-45°.

[0011] As a preferred technical solution, the limiting notch is opened along the direction from the center point of the foil fixing seat to the opposite direction of the spring. The slot length of the limiting notch is the same as the length of the projection of the concave curved surface of the cam contact surface onto the end face.

[0012] After adopting the above technical solution, the present invention has the following advantages:

[0013] A foil end face gas film sealing structure with an actively controllable foil inclination angle of the present invention adopts an electromagnetic control method to realize the function of intelligent closed-loop regulation of the inclination angle of the foils. The upper layer of the foils is a flat foil and the lower layer is a cylindrical foil. The cylindrical foil fits the cam contact surface of the cam disc and acts as a cam roller. Under the pulling force of the spring, the cylindrical foil always fits the cam contact surface, so as to realize the change of the foil inclination angle along with the shape of the cam contact surface. At the same time, the cam disc can provide a rigid support for the foils to ensure the stiffness of the foils. The cylindrical foil can also improve the anti-impact and vibration performance of the foils.

[0014] By applying different voltages to the coil or sequentially changing the energization time or direction of adjacent coils to generate a corresponding magnetic field to control the rotation of the magnet, that is, the rotation of the cam disc. Through the photoelectric sensor on the foil fixing seat, the displacement of the foil at this moment and the foil at the previous moment is measured, and then it is converted into the change amount of the foil inclination angle, and the magnetic field state is feedback-regulated. After being processed by algorithms such as PID, the closed-loop regulation of the foil inclination angle can be realized, so that when the foil changes due to external disturbances, the foil inclination angle can always be maintained at the optimal structural parameters. Secondly, the foil inclination angle can also be actively regulated to adapt to different working conditions, thereby improving the stability and applicability of the seal. Brief Description of the Drawings

[0015] Figure 1 It is an exploded view of a foil end face gas film sealing structure with an actively controllable foil inclination angle;

[0016] Figure 2 It is a structural schematic diagram of a foil end face regulation assembly;

[0017] Figure 3 It is a structural schematic diagram of a single group of foils;

[0018] Figure 4 It is a structural schematic diagram of a cam disc;

[0019] Figure 5 It is a structural schematic diagram of a ring body;

[0020] Figure 6 It is a schematic structural diagram of an electromagnetic drive assembly;

[0021] Figure 7 It is a top view of the air film seal structure at the end face of the foil;

[0022] Figure 8 is Figure 7 a cross-sectional view of the A-A section in

[0023] In the figure:

[0024] 1 - Foil end face adjustment component; 101 - Foil; 1011 - First spring fixing groove; 1012 - Flat foil; 1013 - Cylindrical foil; 102 - Foil mounting ring; 1021 - First threaded hole; 103 - Foil fixing seat; 1031 - Photoelectric sensor; 1032 - Second spring fixing groove; 104 - Spring;

[0025] 2 - Cam disc; 201 - Foil end face adjustment component mounting groove; 202 - Limit notch; 203 - Magnet; 204 - Cam contact surface; 2041 - Flat surface; 2042 - Concave curved surface;

[0026] 3 - Ring body; 301 - Cam disc mounting groove; 302 - Electromagnetic drive assembly mounting groove; 303 - First through hole; 304 - Second threaded hole; 305 - Sealing dam;

[0027] 4 - Electromagnetic drive assembly; 401 - Coil; 402 - Coil base; 403 - Second through hole;

[0028] 5 - Bolt group; 501 - First bolt; 502 - Second bolt. Specific embodiments

[0029] The following further elaborates on the present invention in detail in conjunction with the accompanying drawings and specific embodiments.

[0030] Refer to Figures 1-8 , a foil end face air film seal structure with actively controllable foil inclination angle, including the moving ring and the static ring of the air film seal; it is characterized in that:

[0031] At least one of the moving ring or the stationary ring is a foil face seal ring; the foil face seal ring includes a foil face control assembly 1, a cam disc 2, a ring body 3, an electromagnetic drive assembly 4 and a bolt group 5; the foil face control assembly 1 includes a foil 101, a foil fixing seat 103, a foil mounting ring 102, and a spring 104; a first spring fixing groove 1011 is provided on the foil 101, a second spring fixing groove 1032 and a photoelectric sensor 1031 are provided on the foil fixing seat 103, one end of the spring 104 is fixed in the first spring fixing groove 1011, and the other end is fixed in the second spring fixing groove 1032, so that the foil 101 is elastically connected to the foil fixing seat 103; the foil fixing seat 103 and the foil mounting ring 102 are connected by mortise and tenon joints, the foil fixing seats 103 are evenly arranged along the circumference of the foil mounting ring 102, the foils 101 are evenly arranged in the circumferential direction, and a number of first threaded holes 1021 are evenly provided along the circumference on the foil mounting ring 102; a number of magnets 203 are evenly arranged along the circumference on the inner diameter side of the cam disc 2, a number of limiting notch openings 202 are evenly provided along the circumference on the cam disc 2, the cam disc 2 is provided with a foil face control assembly mounting groove 201, and the surface of the foil 101 in contact with the cam disc 2 is set as a cam contact surface 204; the ring body 3 is provided with a cam disc mounting groove 301 and an electromagnetic drive assembly mounting groove 302, a number of first through holes 303 and second threaded holes 304 are evenly provided along the circumference on the ring body 3, and the ring body 3 is provided with a sealing dam 305; the electromagnetic drive assembly 4 includes a coil base 402 and coils 401, a number of coils 401 are evenly arranged along the circumference on the inner diameter side of the coil base 402, and a number of second through holes 403 are evenly provided along the circumference on the outer diameter side of the coil base 402; the foil mounting ring 102 is placed in the foil face control assembly mounting groove 201, the cam disc 2 is placed in the cam disc mounting groove 301, the bolt group 5 includes a number of first bolts 501 and a number of second bolts 502, the first bolts 501 connect the foil mounting ring 102 and the ring body 3 through the first through holes 303, the limiting notch openings 202 and the first threaded holes 1021, and the second bolts 502 fix the electromagnetic drive assembly 4 in the ring body 3 through the second through holes 403 and the second threaded holes 304; the foil 101 is tightly attached to the cam contact surface 204 under the pulling force of the spring 104.

[0032] The coils 401 control the magnetic field action intensity, time or direction by connecting to different magnitudes of voltage or sequentially changing the energization time or direction of adjacent coils 401; under the magnetic field action of the coils 401, the magnets 203 control the relative rotation of the cam disc 2 and the ring body 3, and further cause the inclination angle of the foil 101 to change along with the change of the cam contact surface 204.

[0033] The foil 101 includes a flat foil 1012 and a cylindrical foil 1013. The flat foil 1012 and the cylindrical foil 1013 are connected by welding, and the cylindrical foils 1013 are uniformly arranged circumferentially below the flat foil 1012.

[0034] The cam contact surface 204 includes a plurality of concave curved surfaces 2042 and flat surfaces 2041 that are uniformly arranged in the circumferential direction. The number of the concave curved surfaces 2042 is an integer multiple of the number of the foils 101, and the inclination angle of the foil 101 varies in the range of 0-45° under the rotation of the cam disc 2.

[0035] The limiting notch 202 is opened along the direction from the center point of the foil fixing seat 103 to the opposite direction of the spring 104, and the arc length of the limiting notch 202 is the same as the arc length of the projection of the concave curved surface 2042 of the cam contact surface 204 onto the end face.

[0036] The above embodiments are illustrative of the present invention, not limiting of the present invention. Any solution obtained by simply transforming the present invention falls within the protection scope of the present invention.

Claims

1. A foil end face gas film sealing structure with actively controllable foil inclination angle, comprising a moving ring and a stationary ring of the gas film seal; characterized in that: At least one of the moving ring or the stationary ring is a foil face seal ring; the foil face seal ring includes a foil face regulating component, a cam disc, a ring body, an electromagnetic driving component and a bolt group; the foil face regulating component includes a foil, a foil fixing seat, a foil mounting ring and a spring; a first spring fixing groove is provided on the foil, a second spring fixing groove and a photoelectric sensor are provided on the foil fixing seat, one end of the spring is fixed in the first spring fixing groove, and the other end is fixed in the second spring fixing groove, so that the foil is elastically connected to the foil fixing seat; the foil fixing seat is connected to the foil mounting ring by mortise and tenon joints, the foil fixing seats are uniformly arranged along the circumference of the foil mounting ring, the foils are uniformly arranged along the circumferential direction, and a plurality of first threaded holes are uniformly provided on the foil mounting ring along the circumferential direction; a plurality of magnets are uniformly arranged along the circumferential direction on the inner diameter side of the cam disc, a plurality of limiting notch openings are uniformly formed in the cam disc along the circumferential direction, the cam disc is provided with a foil face regulating component mounting groove, and the surface of the foil in contact with the cam disc is set as a cam contact surface; the ring body is provided with a cam disc mounting groove and an electromagnetic driving component mounting groove, a plurality of first through holes and second threaded holes are uniformly formed in the ring body along the circumferential direction, and the ring body is provided with a sealing dam; the electromagnetic driving component includes a coil base and coils, and a plurality of coils are uniformly arranged along the circumferential direction on the inner diameter side of the coil base, and a plurality of second through holes are uniformly formed in the coil base along the outer diameter side; the foil mounting ring is placed in the foil face regulating component mounting groove, the cam disc is placed in the cam disc mounting groove, the bolt group includes a plurality of first bolts and a plurality of second bolts, the first bolts connect the foil mounting ring and the ring body through the first through holes, the limiting notch openings and the first threaded holes, and the second bolts fix the electromagnetic driving component in the ring body through the second through holes and the second threaded holes; the foil is tightly attached to the cam contact surface under the pulling force of the spring.

2. The gas film seal structure at the end face of the foil with an actively controllable foil inclination angle as described in claim 1, wherein: The coils control the magnetic field action intensity, time or direction by connecting different magnitudes of voltage or sequentially changing the energization time or direction of adjacent coils; under the magnetic field action of the coils, the magnets control the relative rotation of the cam disc and the ring body, and further change the inclination angle of the foil along the change of the cam contact surface.

3. The gas film seal structure at the end face of the foil with an actively controllable foil inclination angle according to claim 1, characterized in that: The foil includes a flat foil and a cylindrical foil, and the flat foil is connected to the cylindrical foil by welding, and the cylindrical foils are uniformly arranged along the circumferential direction below the flat foil.

4. A foil end face gas film sealing structure with an actively controllable foil inclination angle according to claim 1 or claim 2, characterized in that: The cam contact surface includes a plurality of concave curved surfaces and flat surfaces uniformly arranged along the circumferential direction, the number of the concave curved surfaces is an integer multiple of the number of the foils, and the change range of the inclination angle of the foil under the rotation of the cam disc is 0-45°.

5. The gas film seal structure at the end face of the foil with an actively controllable foil inclination angle as claimed in claim 1, wherein: The limiting notch openings are formed along the direction from the center point of the foil fixing seat to the opposite direction of the spring, and the arc length of the limiting notch openings is the same as the arc length of the projection of the concave curved surface of the cam contact surface onto the end face.

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