Sealing device and wheel probe including the same

Abstract

The present invention discloses a sealing device and a wheel-type probe including the device. A first annular groove is formed on the inner surface of a dynamic ring along the circumferential direction, and a second annular groove is formed on the surface of the dynamic ring facing the stationary ring. The dynamic sealing ring is fixed in the second annular groove by press-fitting, and a second O-ring is installed in the first annular groove. The dynamic sealing ring, the dynamic ring, and the second O-ring constitute a dynamic ring assembly. A third annular groove is formed on the outer surface of the stationary ring along the circumferential direction, and an annular notch is formed on the radial inner surface of the stationary ring. A permanent magnet ring is fixed in the annular notch by press-fitting, and a first O-ring is installed in the third annular groove. The permanent magnet ring, the stationary ring, and the first O-ring constitute a stationary ring assembly. The surface of the dynamic sealing ring facing the stationary ring extends beyond the outer surface of the dynamic ring, and the dynamic ring assembly and the stationary ring assembly are axially attracted and bonded together by magnetic force. The present invention can solve the technical problem that the magnetic force of the magnetic stationary ring of the existing sealing device cannot be maintained for a long time, is prone to magnetic force attenuation, and causes sealing failure.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary sealing, and in particular to a magnetic sealing device for a rail wheel probe and a wheel probe comprising the device. Background Art

[0002] Ultrasonic flaw detection equipment is widely used in multiple technical fields. The principle of ultrasonic flaw detection is that when ultrasonic waves propagate through the material being tested, changes in the acoustic properties and internal structure of the material caused by internal damage will have a certain impact on the propagation of the ultrasonic waves. By detecting the degree and condition of the impact on the ultrasonic waves, the material's performance and structural changes can be understood. To facilitate non-destructive flaw testing on rails, ultrasonic wheel probes are typically installed on the flaw detection vehicle. The ultrasonic wheel probes are equipped with ultrasonic sensors. As the flaw detection vehicle moves on the track, the ultrasonic sensors installed in the ultrasonic wheel probes convert electrical pulses into ultrasonic waves. The ultrasonic waves emitted by each group of ultrasonic sensors pass through the medium and are refracted into the track. By refracting the ultrasonic waves at predetermined angles, damage to predetermined parts of the rail can be detected.

[0003] Mechanical transmission products require sealing assemblies to eliminate leakage caused by pressure differentials between the fluid medium inside and outside the output shaft cavity. Magnetic seals, a commonly used end-face sealing method, utilize the magnetic field of a magnetic material to attract the compensating ring assembly and the non-compensating ring assembly, ensuring a tight fit between the friction surfaces of the compensating and non-compensating rings. For example, Guangdong Shantou Ultrasonic Electronics Co., Ltd. filed a utility model patent application on July 17, 2017, and published on May 5, 2018, with publication number CN207366511U, which discloses a track wheel probe. This wheel probe features sealing devices between the left and right flanges and the left and right shafts. With its unique mechanical sealing performance and compact installation footprint, magnetic seals have effectively replaced felt seals, labyrinth seals, and rubber seals used on rotating shafts in some mechanical equipment. They completely eliminate oil leakage caused by seal wear, significantly improving the operating environment, reducing environmental pollution, and enhancing equipment quality.

[0004] In the prior art, the following technical solutions are mainly related to the present invention:

[0005] This prior art is a Chinese invention application filed by Harbin Dongan Engine (Group) Co., Ltd. on November 21, 2012, and published on March 27, 2013, with publication number CN102996812A. The invention discloses a magnetic sealing device comprising a rotor, a magnetic stationary ring, and a moving ring. The rotor is provided with a magnetic stationary ring and a moving ring in sequence. Graphite is provided at one end of the magnetic stationary ring near the moving ring, and the magnetic stationary ring extends axially to a certain width. The position where the O-ring is installed on the rotor is conical, and this cone allows the O-ring to move toward the contact surface between the magnetic stationary ring and the moving ring. The invention enhances the sealing effect by allowing the magnetic stationary ring to extend axially to a certain width, while also designing the rotor outer diameter to be conical where the O-ring fits. This achieves a better magnetic sealing effect and effectively reduces lubricating oil leakage.

[0006] The above-mentioned existing technology uses the principle of magnetic sealing, which provides magnetic force by magnetizing the static ring and ensures the perfect fit of the sealing end faces through magnetic attraction. However, in actual working conditions, the magnetic force of the magnetic static ring of existing magnetic sealing devices will significantly attenuate under vibration. The combined force of the axial force applied to the dynamic ring by the O-ring assembled on the dynamic ring and the dynamic ring's own inertia may exceed the magnetic force of the magnetic static ring, causing the magnetic static ring to separate from the dynamic ring, resulting in oil leakage and seal failure. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a sealing device and a wheel probe including the device to solve the technical problem that the magnetic force of the magnetic static ring of the existing sealing device cannot be stable for a long time, is prone to magnetic force attenuation, and leads to sealing failure.

[0008] To achieve the aforementioned objectives, the present invention specifically provides a technical implementation of a sealing device. The sealing device is installed between the wheel axle and the flange seat and comprises: a permanent magnet ring, a stationary ring, a first O-ring, a dynamic sealing ring, a dynamic ring, and a second O-ring. The inner surface of the dynamic ring is circumferentially defined by a first annular groove, and the surface of the dynamic ring facing the stationary ring is defined by a second annular groove. The dynamic sealing ring is press-fitted into the second annular groove, and the second O-ring is mounted in the first annular groove. The dynamic sealing ring, the dynamic ring, and the second O-ring constitute a dynamic ring assembly. The outer surface of the stationary ring is circumferentially defined by a third annular groove, and the surface of the stationary ring facing away from the stationary ring is circumferentially defined by an annular notch. The permanent magnet ring is press-fitted into the annular notch, and the first O-ring is mounted in the third annular groove. The permanent magnet ring, the stationary ring, and the first O-ring constitute a stationary ring assembly. The surface of the dynamic sealing ring facing the stationary ring extends beyond the outer surface of the dynamic ring. The dynamic and stationary ring assemblies are axially bonded together by magnetic attraction. When relative rotation occurs between the dynamic ring assembly and the static ring assembly, the dynamic sealing ring rubs against the surface of the static ring to achieve sealing.

[0009] Furthermore, the permanent magnet ring is embedded in the non-installation surface of the static ring and extends a certain depth in the axial direction to provide a constant magnetic force between the static ring and the dynamic sealing ring to ensure the fit of the sealing end faces.

[0010] Furthermore, the annular notch penetrates radially to the inner surface of the stationary ring.

[0011] The present invention also specifically provides a technical implementation of another sealing device, installed between the wheel axle and the flange seat, comprising: a stationary ring, a first O-ring, a dynamic sealing ring, a dynamic ring, and a second O-ring. The inner surface of the dynamic ring is circumferentially defined by a first annular groove, and the surface of the dynamic ring facing the stationary ring is defined by a second annular groove. The dynamic sealing ring is press-fitted into the second annular groove, and the second O-ring is mounted in the first annular groove. The dynamic sealing ring, the dynamic ring, and the second O-ring constitute a dynamic ring assembly. The outer surface of the stationary ring is circumferentially defined by a third annular groove, and the first O-ring is mounted in the third annular groove. The stationary ring and the first O-ring constitute a stationary ring assembly. The stationary ring is made of a magnetic material, and the surface of the dynamic sealing ring facing the stationary ring extends beyond the outer surface of the dynamic ring. The dynamic and stationary ring assemblies are axially attached together by magnetic attraction. When the dynamic and stationary ring assemblies rotate relative to each other, the dynamic sealing ring rubs against the surface of the stationary ring, achieving a seal.

[0012] The present invention also specifically provides a technical implementation scheme for a third sealing device. The sealing device is installed between the wheel axle and the flange seat and includes: a magnetic column, a stationary ring, a first O-ring, a dynamic sealing ring, a dynamic ring, and a second O-ring. The inner surface of the dynamic ring is circumferentially defined by a first annular groove, and the surface of the dynamic ring facing the stationary ring is defined by a second annular groove. The dynamic sealing ring is press-fitted into the second annular groove, and the second O-ring is installed in the first annular groove. The dynamic sealing ring, the dynamic ring, and the second O-ring constitute a dynamic ring assembly. The outer surface of the stationary ring is circumferentially defined by a third annular groove, and the outer surface of the stationary ring facing the stationary ring is circumferentially defined by several mounting holes. The magnetic column is embedded in the mounting holes, and the first O-ring is installed in the third annular groove. The magnetic column, the stationary ring, and the first O-ring constitute a stationary ring assembly. The surface of the dynamic sealing ring facing the stationary ring extends beyond the outer surface of the dynamic ring. The dynamic and stationary ring assemblies are axially attached together by magnetic attraction. When relative rotation occurs between the dynamic ring assembly and the static ring assembly, the dynamic sealing ring rubs against the surface of the static ring to achieve sealing.

[0013] Furthermore, the magnetic columns are evenly distributed along the circumference of the static ring at a set angle and embedded in the mounting hole.

[0014] Furthermore, the magnetic column adopts a small cylindrical structure of a permanent magnet.

[0015] The present invention also specifically provides a technical implementation scheme for a fourth sealing device. The sealing device is installed between the wheel axle and the flange seat and includes: a permanent magnet ring, a stationary ring, a first O-ring, a dynamic sealing ring, a dynamic ring, and a second O-ring. The inner surface of the dynamic ring is circumferentially defined by a first annular groove, and the surface of the dynamic ring facing the stationary ring is circumferentially defined by a second annular groove. The dynamic sealing ring is press-fitted into the second annular groove, and the second O-ring is installed in the first annular groove. The dynamic sealing ring, the dynamic ring, and the second O-ring constitute the dynamic ring assembly. The outer surface of the stationary ring is circumferentially defined by a third annular groove. The stationary ring includes an annular housing (I) and an annular housing (II) disposed axially opposite each other. The contacting surfaces of the annular housings (I) and (II) are respectively defined by interconnected fourth and fifth annular grooves. The permanent magnet ring is embedded in the fourth and fifth annular grooves, and the first O-ring is installed in the third annular groove. The permanent magnet ring, the stationary ring, and the first O-ring constitute the stationary ring assembly. The surface of the dynamic seal ring facing the stationary ring extends beyond the outer surface of the dynamic ring. The dynamic and stationary ring assemblies are axially attracted and affixed together by magnetic force. When the dynamic and stationary ring assemblies rotate relative to each other, the dynamic seal ring rubs against the surface of the stationary ring to achieve a seal.

[0016] Furthermore, the dynamic ring assembly is installed on the coupling medium side that needs to be sealed. When relative rotation occurs between the flange seat and the wheel axle, relative rotation also occurs between the dynamic ring assembly and the static ring assembly accordingly. The sealing between the dynamic ring assembly and the static ring is achieved through the high flatness and roughness of the sealing end surface between the dynamic sealing ring and the static ring.

[0017] Furthermore, the second O-ring can automatically compensate for the wear of the sealing end face through its own elastic torsion and angular floating, and adapt to the movement of the wheel axle.

[0018] Furthermore, when the wheel probe is in operation, a liquid film is maintained between the dynamic sealing ring and the static ring to avoid dry friction between the sealing end faces.

[0019] Furthermore, the dynamic sealing ring is made of graphite material.

[0020] Furthermore, the moving ring is made of martensitic stainless steel.

[0021] The present invention also specifically provides a technical implementation scheme for a wheel probe, which includes: an axle, a flange seat, a pressure ring, a transducer seat, an ultrasonic sensor, a center frame, a bearing, a radiator, a wheel probe membrane, a wheel probe, a bobbin, and the sealing device as described above. The transducer seat and the radiator are mounted on the center frame, and the ultrasonic sensor is mounted on the transducer seat. The axle is mounted on one end of the center frame along the axial direction, and the bobbin is mounted on the other end of the center frame along the axial direction. Two flange seats are respectively mounted on the axle and the bobbin, and the wheel probe membrane is pressed onto the flange seat by the pressure ring, and the wheel probe membrane is filled with wheel probe liquid. The flange seat is mounted on the axle and the bobbin through a bearing, and the sealing device is arranged between the axle and the flange seat.

[0022] Furthermore, the first O-ring is interference fitted with the shaft hole of the flange seat to achieve static sealing, and the second O-ring is interference fitted with the wheel shaft to achieve static sealing.

[0023] By implementing the technical solution of the sealing device and the wheel probe including the same provided by the present invention, the following beneficial effects are achieved:

[0024] (1) The sealing device and the wheel-type probe including the device of the present invention provide magnetic force through the static ring assembly. The magnetic force is uniform and stable and not easy to attenuate. This solves the technical problem that the magnetic force of the magnetic static ring of the existing sealing device cannot be stable for a long time and is prone to magnetic attenuation, resulting in sealing failure, thereby improving the service life of the product.

[0025] (2) The sealing device of the present invention and the wheel-type probe including the same ensure the fit of the sealing end faces by the magnetic attraction between the magnetic static ring and the dynamic sealing ring. The two generate frictional motion and rely on the high flatness and roughness requirements of the sealing end faces to ensure the contact area of ​​the sealing end faces, thereby achieving sealing between the rotor and the stator. The device has good processability and excellent rust resistance.

[0026] (3) In the sealing device of the present invention and the wheel-type probe including the same, torque is transmitted between the dynamic ring and the rotor, and between the magnetic static ring and the housing, through O-shaped rubber rings to achieve secondary sealing. The O-shaped rubber ring between the dynamic sealing ring and the rotating shaft can automatically compensate for the wear of the sealing end face through its own elastic torsion and angular floating, and adapt to the movement of the rotating shaft.

[0027] (4) The sealing device of the present invention and the wheel probe including the same maintain an extremely thin oil film between the sealing end faces during operation, thereby avoiding dry friction between the end faces, effectively reducing the degree of wear of the sealing end faces and extending the service life; at the same time, the sealing device has high working capacity, low leakage rate of the sealed medium, good sealing performance, and low friction power loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be derived from these drawings without inventive effort.

[0029] Figure 1 1 is a schematic diagram of the assembly structure of the sealing device embodiment 1 of the present invention;

[0030] Figure 2 1 is a partial cross-sectional schematic diagram of the installation structure of the sealing device embodiment 1 of the present invention;

[0031] Figure 3 1 is a schematic cross-sectional view of a sealing device according to embodiment 1 of the present invention;

[0032] Figure 4 1 is a schematic diagram of the three-dimensional structure of a sealing device according to embodiment 1 of the present invention;

[0033] Figure 5 1 is a schematic top view of the structure of a sealing device according to embodiment 1 of the present invention;

[0034] Figure 6 2. It is a schematic bottom view of the structure of the sealing device embodiment 1 of the present invention;

[0035] Figure 7 1 is a schematic cross-sectional view of another variant of the sealing device embodiment 1 of the present invention;

[0036] Figure 8 2 is a schematic cross-sectional view of a sealing device according to a second embodiment of the present invention;

[0037] Figure 9 1 is a schematic cross-sectional view of a sealing device according to embodiment 3 of the present invention;

[0038] Figure 10 1 is a schematic diagram of the assembly structure of the sealing device embodiment 3 of the present invention;

[0039] Figure 11 1 is a schematic cross-sectional view of a fourth embodiment of a sealing device according to the present invention;

[0040] Figure 12 This is a schematic diagram of the installation cross-sectional structure of a specific embodiment of the wheel probe of the present invention;

[0041] Figure 13 This is a schematic diagram of the longitudinal cross-section structure of the installation of a specific embodiment of the wheel probe of the present invention;

[0042] In the figure: 1-permanent magnet ring, 2-static ring, 3-first O-ring, 4-dynamic sealing ring, 5-dynamic ring, 6-second O-ring, 7-magnetic column, 8-annular shell one, 9-annular shell two, 10-sealing device, 11-wheel axle, 12-flange seat, 13-pressure ring, 14-transducer seat, 15-ultrasonic sensor, 16-center frame, 17-bearing, 18-radiator, 19-probe wheel membrane, 20-wheel probe, 21-spool, 22-fill / drain valve, 23-first annular groove, 24-second annular groove, 25-third annular groove, 26-annular notch, 27-mounting hole, 28-fourth annular groove, 29-fifth annular groove, 30-axis hole, 31-probe wheel fluid, 32-probe wheel frame, 33-sound barrier, 40-rail. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] As attached Figure 1 To the attached Figure 13 As shown in the figure, a specific embodiment of the sealing device of the present invention and a wheel probe including the same is given. The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0045] Example 1

[0046] As attached Figure 1 To the attached Figure 6 As shown, an embodiment of the sealing device 10 of the present invention is installed between the wheel shaft 11 and the flange seat 12, and specifically includes: a permanent magnet ring 1, a static ring 2, a first O-ring 3, a dynamic sealing ring 4, a dynamic ring 5 and a second O-ring 6. The inner surface of the dynamic ring 5 is provided with a first annular groove 23 along the circumferential direction, and the side surface of the dynamic ring 5 facing the static ring 2 is provided with a second annular groove 24. The dynamic sealing ring 4 is fixed in the second annular groove 24 by press-fitting, and the second O-ring 6 is installed in the first annular groove 23. The dynamic sealing ring 4, the dynamic ring 5 and the second O-ring 6 constitute a dynamic ring assembly. The outer surface of the static ring 2 is provided with a first annular groove 23 along the circumferential direction (as shown in the attached figure). Figure 1 A third annular groove 25 is provided on the surface of the stationary ring 2 away from the dynamic ring 5 along the circumferential direction, and the annular notch 26 is further provided along the radial direction (as shown in the attached Figure 3The permanent magnet ring 1 is fixed in the annular notch 26 by press-fitting, and the first O-ring 3 is installed in the third annular groove 25. The permanent magnet ring 1, the static ring 2 and the first O-ring 3 constitute the static ring assembly. The surface of the dynamic seal ring 4 facing the static ring 2 extends (slightly higher) from the outer surface of the dynamic ring 5. The dynamic ring assembly and the static ring assembly are axially connected (as shown in the attached figure). Figure 3 The two rings (in the direction indicated by B) are magnetically attracted and bonded together. The permanent magnet ring 1 is embedded within the non-mounting surface of the stationary ring 2 and extends axially to a certain depth, providing a constant magnetic force between the stationary ring and the dynamic seal ring 4 to ensure proper seal contact. When the dynamic and stationary ring assemblies rotate relative to each other, the dynamic seal ring 4 rubs against the surface of the stationary ring 2, achieving a seal.

[0047] The first O-ring 3 and the second O-ring 6 can be made of rubber rings, the dynamic sealing ring 4 can be made of graphite, the stationary ring 2 can be made of magnetic material, and the dynamic ring 5 can be made of martensitic stainless steel.

[0048] The first O-ring 3 is interference-fitted with the axial hole 30 of the flange seat 12 to achieve a static seal, while the second O-ring 6 is interference-fitted with the axle 11 to achieve a static seal. The dynamic ring assembly is installed on the coupling medium side to be sealed, and the magnetic attraction between the static ring 2 and the dynamic sealing ring 4 ensures the seal face contact. When the flange seat 12 and the axle 11 undergo relative rotation, the dynamic and static ring assemblies also rotate relative to each other, generating friction between the static ring 2 and the dynamic sealing ring 4. The highly flat and rough sealing faces between the dynamic and static rings 4 and 2 ensure a seal between the dynamic and static ring assemblies. The second O-ring 6, located between the dynamic sealing ring 4 and the rotating shaft (i.e., axle 11), automatically compensates for seal face wear and adapts to movement of the axle 11 (i.e., the rotating shaft) through its elastic torsion and angular float (i.e., rocking rotation at a certain angle to the shaft). When the wheel probe 20 is working, an extremely thin liquid film is maintained between the dynamic sealing ring 4 and the static ring 2 to avoid dry friction between the sealing end faces, which can effectively reduce the wear of the sealing end faces and extend the service life.

[0049] As another variation of this embodiment, different from the embodiment 1, the annular gap 26 is radially (as shown in the attached Figure 3 The direction shown in A in FIG. 1 does not penetrate the inner surface of the stationary ring 2 (in this modified embodiment, the annular gap 26 is a ring groove structure), as shown in FIG. Figure 7 shown.

[0050] The sealing device 10 described in this embodiment can well meet the requirements of maintaining a relatively stable magnetic force for a long time under actual working conditions of liquid solvents, and can achieve a zero-leakage magnetic sealing state. While ensuring the flatness and roughness of the sealing end face, it effectively improves the magnetic attenuation phenomenon of the magnetic static ring in the existing magnetic sealing device, ensures the perfect fit between the static ring and the dynamic sealing ring, and has good processing technology and excellent rust resistance.

[0051] Example 2

[0052] As attached Figure 8 As shown, an embodiment of the sealing device 10 of the present invention is installed between the wheel axle 11 and the flange seat 12, and specifically includes: a static ring 2, a first O-ring 3, a dynamic sealing ring 4, a dynamic ring 5 and a second O-ring 6. The inner surface of the dynamic ring 5 is provided with a first annular groove 23 in the circumferential direction, and the surface of the dynamic ring 5 facing the static ring 2 is provided with a second annular groove 24. The dynamic sealing ring 4 is fixed in the second annular groove 24 by press-fitting, and the second O-ring 6 is installed in the first annular groove 23. The dynamic sealing ring 4, the dynamic ring 5 and the second O-ring 6 constitute a dynamic ring assembly. The outer surface of the static ring 2 is provided with a third annular groove 25 in the circumferential direction, and the first O-ring 3 is installed in the third annular groove 25. The static ring 2 and the first O-ring 3 constitute a static ring assembly. The static ring 2 further adopts an integral magnetic material, and the surface of the dynamic sealing ring 4 facing the static ring 2 extends out of the outer surface of the dynamic ring 5, and the dynamic ring assembly and the static ring assembly are axially connected (as shown in the attached figure). Figure 8 When the dynamic ring assembly and the static ring assembly rotate relative to each other, the dynamic sealing ring 4 rubs against the surface of the static ring 2 to achieve sealing.

[0053] The first O-ring 3 and the second O-ring 6 can be made of rubber rings, the dynamic sealing ring 4 can be made of graphite, the stationary ring 2 can be made of integral magnetic material, and the dynamic ring 5 can be made of martensitic stainless steel.

[0054] The first O-ring 3 is interference-fitted with the axial hole 30 of the flange seat 12 to achieve a static seal, while the second O-ring 6 is interference-fitted with the axle 11 to achieve a static seal. The dynamic ring assembly is installed on the coupling medium side to be sealed, and the magnetic attraction between the static ring 2 and the dynamic sealing ring 4 ensures the sealing end faces are in contact. When the flange seat 12 and the axle 11 rotate relative to each other, the dynamic and static ring assemblies also rotate relative to each other, generating friction between the static ring 2 and the dynamic sealing ring 4. The highly flat and rough sealing end faces between the dynamic and static rings 4 and 2 ensure a seal between the dynamic and static ring assemblies. The second O-ring 6 between the dynamic sealing ring 4 and the rotating shaft automatically compensates for wear on the sealing end faces through its elastic torsion and angular float, and adapts to movement of the axle 11 (i.e., the rotating shaft). When the wheel probe 20 is in operation, a very thin liquid film is maintained between the dynamic sealing ring 4 and the static ring 2 to prevent dry friction between the sealing end faces, effectively reducing wear on the sealing end faces and extending their service life.

[0055] The sealing device 10 described in this embodiment is more streamlined in structure than that in the first embodiment, and has better processability and lower requirements for rust resistance.

[0056] Example 3

[0057] As attached Figure 9 and attached Figure 10 As shown in FIG. 1 , an embodiment of a sealing device 10 of the present invention is installed between a wheel shaft 11 and a flange seat 12, and specifically comprises: a magnetic column 7, a stationary ring 2, a first O-ring 3, a dynamic sealing ring 4, a dynamic ring 5 and a second O-ring 6. The inner surface of the dynamic ring 5 is circumferentially (as shown in FIG. 1 ). Figure 10 A first annular groove 23 is provided on the surface of the dynamic ring 5 facing the static ring 2 (in the direction shown by W in the figure), and a second annular groove 24 is provided on the surface of the dynamic ring 5 facing the static ring 2. The dynamic sealing ring 4 is fixed in the second annular groove 24 by press-fitting, and the second O-ring 6 is installed in the first annular groove 23. The dynamic sealing ring 4, the dynamic ring 5 and the second O-ring 6 constitute a dynamic ring assembly. A third annular groove 25 is provided on the outer surface of the static ring 2 along the circumferential direction, and a plurality of mounting holes 27 are provided on the outer surface of the static ring 2 facing the dynamic ring 5 along the circumferential direction. The magnetic column 7 is embedded in the mounting hole 27, and the first O-ring 3 is installed in the third annular groove 25. The magnetic column 7, the static ring 2 and the first O-ring 3 constitute a static ring assembly. The surface of the dynamic sealing ring 4 facing the static ring 2 extends out from the outer surface of the dynamic ring 5, and the dynamic ring assembly and the static ring assembly are connected axially (as shown in the attached figure). Figure 9 When the dynamic ring assembly and the static ring assembly rotate relative to each other, the dynamic sealing ring 4 rubs against the surface of the static ring 2 to achieve sealing.

[0058] The magnetic columns 7 may further adopt a small cylindrical structure of a permanent magnet, and are evenly distributed along the circumference of the static ring 2 at a set angle and embedded in the mounting hole 27 .

[0059] The first O-ring 3 and the second O-ring 6 can be made of rubber rings, the dynamic sealing ring 4 can be made of graphite, the stationary ring 2 can be made of magnetic material, and the dynamic ring 5 can be made of martensitic stainless steel.

[0060] The first O-ring 3 is interference-fitted with the axial hole 30 of the flange seat 12 to achieve a static seal, while the second O-ring 6 is interference-fitted with the axle 11 to achieve a static seal. The dynamic ring assembly is installed on the coupling medium side to be sealed, and the magnetic attraction between the static ring 2 and the dynamic sealing ring 4 ensures the sealing end faces are in contact. When the flange seat 12 and the axle 11 rotate relative to each other, the dynamic and static ring assemblies also rotate relative to each other, generating friction between the static ring 2 and the dynamic sealing ring 4. The highly flat and rough sealing end faces between the dynamic and static rings 4 and 2 ensure a seal between the dynamic and static ring assemblies. The second O-ring 6 between the dynamic sealing ring 4 and the rotating shaft automatically compensates for wear on the sealing end faces through its elastic torsion and angular float, and adapts to movement of the axle 11 (i.e., the rotating shaft). When the wheel probe 20 is in operation, a very thin liquid film is maintained between the dynamic sealing ring 4 and the static ring 2 to prevent dry friction between the sealing end faces, effectively reducing wear on the sealing end faces and extending their service life.

[0061] The sealing device 10 described in this embodiment has all the advantages of the embodiment 1, and has better uniformity and stability of magnetic force and better anti-rust performance.

[0062] Example 4

[0063] As attached Figure 11As shown, an embodiment of a sealing device 10 according to the present invention is installed between a wheel axle 11 and a flange seat 12. Specifically, it comprises a permanent magnet ring 1, a stationary ring 2, a first O-ring 3, a dynamic sealing ring 4, a dynamic ring 5, and a second O-ring 6. The inner surface of the dynamic ring 5 is circumferentially defined by a first annular groove 23, and the side of the dynamic ring 5 facing the stationary ring 2 is defined by a second annular groove 24. The dynamic sealing ring 4 is press-fitted into the second annular groove 24, and the second O-ring 6 is installed in the first annular groove 23. The dynamic sealing ring 4, the dynamic ring 5, and the second O-ring 6 constitute a dynamic ring assembly. A third annular groove 25 is circumferentially defined on the outer surface of the stationary ring 2. The stationary ring 2 comprises an annular housing 1 8 and an annular housing 2 9, which are axially opposed to each other. The contacting surfaces of the annular housing 1 8 and the annular housing 2 9 are respectively defined by interconnected fourth and fifth annular grooves 28 and 29. The permanent magnet ring 1 is embedded in the fourth annular groove 28 and the fifth annular groove 29, and the first O-ring 3 is installed in the third annular groove 25. The permanent magnet ring 1, the static ring 2 and the first O-ring 3 form a static ring assembly. The surface of the dynamic seal ring 4 facing the static ring 2 extends out of the outer surface of the dynamic ring 5. The dynamic ring assembly and the static ring assembly are connected in the axial direction (as shown in the attached figure). Figure 11 When the dynamic ring assembly and the static ring assembly rotate relative to each other, the dynamic sealing ring 4 rubs against the surface of the static ring 2 to achieve sealing.

[0064] The first O-ring 3 and the second O-ring 6 can be made of rubber rings, the dynamic sealing ring 4 can be made of graphite, the stationary ring 2 can be made of magnetic material, and the dynamic ring 5 can be made of martensitic stainless steel.

[0065] The first O-ring 3 is interference-fitted with the axial hole 30 of the flange seat 12 to achieve a static seal, while the second O-ring 6 is interference-fitted with the axle 11 to achieve a static seal. The dynamic ring assembly is installed on the coupling medium side to be sealed, and the magnetic attraction between the static ring 2 and the dynamic sealing ring 4 ensures the sealing end faces are in contact. When the flange seat 12 and the axle 11 rotate relative to each other, the dynamic and static ring assemblies also rotate relative to each other, generating friction between the static ring 2 and the dynamic sealing ring 4. The highly flat and rough sealing end faces between the dynamic and static rings 4 and 2 ensure a seal between the dynamic and static ring assemblies. The second O-ring 6 between the dynamic sealing ring 4 and the rotating shaft automatically compensates for wear on the sealing end faces through its elastic torsion and angular float, and adapts to movement of the axle 11 (i.e., the rotating shaft). When the wheel probe 20 is in operation, a very thin liquid film is maintained between the dynamic sealing ring 4 and the static ring 2 to prevent dry friction between the sealing end faces, effectively reducing wear on the sealing end faces and extending their service life.

[0066] The sealing device 10 described in this embodiment has all the advantages of embodiment 1 and has the best magnetic uniformity and stability, processability and rust resistance among embodiments 1-4.

[0067] Example 5

[0068] As attached Figure 12 and attached Figure 13 As shown, an embodiment of the wheel probe 20 of the present invention specifically includes: an axle 11, a flange seat 12, a pressure ring 13, a transducer seat 14, an ultrasonic sensor 15, a center frame 16, a bearing 17, a radiator 18, a wheel film 19, a wheel probe 20, a bobbin 21, and the sealing device 10 described in Example 1 (the sealing device 10 described in Examples 2, 3 and 4 can also be used). The transducer seat 14 and the radiator 18 are installed on the center frame 16, and the ultrasonic sensor 15 is installed on the transducer seat 14. The axle 11 is installed at one end of the center frame 16 along the axial direction, and the bobbin 21 is installed at the center frame 16 along the axial direction (as shown in the attached figure). Figure 12 The other end of the wheel shaft (in the direction shown by L in the figure). The two flange seats 12 are respectively mounted on the wheel shaft 11 and the spool 21, and the wheel probe membrane 19 is pressed onto the flange seat 12 through the pressure ring 13. The wheel probe membrane 19 is filled with a wheel probe fluid 31 (i.e., the coupling medium), and the wheel probe fluid 31 can be filled or discharged through the filling / draining valve 22 on one of the flange seats 12. The flange seat 12 is mounted on the wheel shaft 11 and the spool 21 through the bearing 17, and the sealing device 10 is arranged between the wheel shaft 11 and the flange seat 12. The first O-ring 3 is interference fit with the axial hole 30 of the flange seat 12 to achieve static sealing, and the second O-ring 6 is interference fit with the wheel shaft 11 to achieve static sealing.

[0069] The wheel axle 11 is fixed by the wheel probe frame 23, and the end of the shaft is connected to the constant temperature docking tube, and then the whole is fixed on the flaw detection mechanical device. During operation, the electrical cable of the wheel probe 20 is connected to the ultrasonic excitation and receiving single board, and the single board generates a high-voltage pulse to excite the ultrasonic sensor to generate ultrasonic waves, which enter the rail 40 through the wheel probe fluid 31, the wheel membrane 19, and the coupling fluid. A sound barrier 33 is also installed on the transducer seat 14 to play a blocking role to prevent the ultrasonic signal from reflecting everywhere inside the wheel probe. The ultrasonic echo reflected in the rail 40 returns to the wheel probe 20, is received by the ultrasonic sensor 15, and is converted into an electrical signal containing echo information, which is sent to the detection system via the wheel probe cable for subsequent analysis and processing. The wheel probe 20 continues to roll, thereby realizing uninterrupted and rapid detection of internal damage to the rail 50.

[0070] By implementing the technical solution of the sealing device and the wheel probe including the sealing device described in the specific embodiment of the present invention, the following technical effects can be achieved:

[0071] (1) The sealing device and the wheel probe including the device described in the specific embodiment of the present invention provide magnetic force through the static ring assembly. The magnetic force is uniform and stable and not easy to attenuate. This solves the technical problem that the magnetic force of the magnetic static ring of the existing sealing device cannot be stable for a long time and is prone to magnetic attenuation, which leads to sealing failure, thereby improving the service life of the product.

[0072] (2) The sealing device and the wheel-type probe including the device described in the specific embodiment of the present invention ensure the fit of the sealing end faces by the magnetic attraction between the magnetic static ring and the dynamic sealing ring. The two generate frictional motion and rely on the high flatness and roughness requirements of the sealing end faces to ensure the contact area of ​​the sealing end faces, thereby achieving sealing between the rotor and the stator. It has good processability and excellent rust resistance.

[0073] (3) In the sealing device and the wheel probe including the same described in the specific embodiment of the present invention, torque is transmitted between the dynamic ring and the rotor, and between the magnetic static ring and the housing, through O-shaped rubber rings to achieve secondary sealing. The O-shaped rubber ring between the dynamic sealing ring and the rotating shaft can automatically compensate for the wear of the sealing end face through its own elastic torsion and angular floating, and adapt to the movement of the rotating shaft;

[0074] (4) The sealing device described in the specific embodiment of the present invention and the wheel probe including the device can maintain an extremely thin oil film between the sealing end faces during operation to avoid dry friction between the end faces, effectively reduce the degree of wear of the sealing end faces and extend the service life; at the same time, the sealing device has high working capacity, low leakage rate of the sealed medium, good sealing performance, and low friction power loss.

[0075] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0076] The above description is only a preferred embodiment of the present invention and does not constitute any formal limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the spirit and technical solution of the present invention, use the methods and technical contents disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention, still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A sealing device, characterized in that: It is installed between the wheel shaft (11) and the flange seat (12), and comprises: a permanent magnet ring (1), a stationary ring (2), a first O-ring (3), a dynamic sealing ring (4), a dynamic ring (5) and a second O-ring (6); the inner surface of the dynamic ring (5) is provided with a first annular groove (23) along the circumferential direction, and the surface of the dynamic ring (5) facing the stationary ring (2) is provided with a second annular groove (24); the dynamic sealing ring (4) is fixed in the second annular groove (24) by press-fitting, and the second O-ring (6) is installed in the first annular groove (23); the dynamic sealing ring (4), the dynamic ring (5) and the second O-ring (6) constitute a dynamic ring assembly; the outer surface of the stationary ring (2) is provided with a second annular groove (24) along the circumferential direction. The invention relates to a three-annular groove (25), wherein a surface of the stationary ring (2) away from the dynamic ring (5) is provided with an annular notch (26) along the circumferential direction; the permanent magnet ring (1) is fixed in the annular notch (26) by press-fitting, and the first O-ring (3) is installed in the third annular groove (25); the permanent magnet ring (1), the stationary ring (2) and the first O-ring (3) constitute a stationary ring assembly; the surface of the dynamic sealing ring (4) facing the stationary ring (2) extends out of the outer surface of the dynamic ring (5), and the dynamic ring assembly and the stationary ring assembly are attached together along the axial direction by magnetic attraction; when relative rotation occurs between the dynamic ring assembly and the stationary ring assembly, the dynamic sealing ring (4) rubs the surface of the stationary ring (2) to achieve sealing.

2. The sealing device according to claim 1, characterized in that: The permanent magnet ring (1) is embedded in the non-installation surface of the stationary ring (2) and extends to a certain depth in the axial direction, providing a constant magnetic force between the stationary ring and the dynamic sealing ring (4) to ensure the fit of the sealing end faces.

3. The sealing device according to claim 2, characterized in that: The annular notch (26) penetrates radially to the inner surface of the stationary ring (2).

4. A sealing device, characterized in that: It is installed between the wheel shaft (11) and the flange seat (12), and comprises: a stationary ring (2), a first O-ring (3), a dynamic sealing ring (4), a dynamic ring (5) and a second O-ring (6); the inner surface of the dynamic ring (5) is provided with a first annular groove (23) along the circumferential direction, and the surface of the dynamic ring (5) facing the stationary ring (2) is provided with a second annular groove (24); the dynamic sealing ring (4) is fixed in the second annular groove (24) by press-fitting, and the second O-ring (6) is installed in the first annular groove (23). The dynamic sealing ring (4), the dynamic ring (5) and the second O-ring (6) constitute the dynamic ring. The invention relates to a static ring assembly; the outer surface of the static ring (2) is provided with a third annular groove (25) along the circumferential direction, the first O-ring (3) is installed in the third annular groove (25), and the static ring (2) and the first O-ring (3) constitute a static ring assembly; the static ring (2) is made of magnetic material, the surface of the dynamic sealing ring (4) facing the static ring (2) extends out of the outer surface of the dynamic ring (5), and the dynamic ring assembly and the static ring assembly are attached together along the axial direction by magnetic attraction; when relative rotation occurs between the dynamic ring assembly and the static ring assembly, the dynamic sealing ring (4) rubs the surface of the static ring (2) to achieve sealing.

5. A sealing device, characterized in that: It is installed between the wheel shaft (11) and the flange seat (12), and comprises: a magnetic column (7), a static ring (2), a first O-ring (3), a dynamic sealing ring (4), a dynamic ring (5) and a second O-ring (6); the inner surface of the dynamic ring (5) is provided with a first annular groove (23) along the circumferential direction, and the surface of the dynamic ring (5) facing the static ring (2) is provided with a second annular groove (24); the dynamic sealing ring (4) is fixed in the second annular groove (24) by press-fitting, and the second O-ring (6) is installed in the first annular groove (23); the dynamic sealing ring (4), the dynamic ring (5) and the second O-ring (6) constitute a dynamic ring assembly; the outer surface of the static ring (2) is provided with a The third annular groove (25) is provided, and a plurality of mounting holes (27) are provided on the outer surface of the static ring (2) facing the dynamic ring (5) along the circumferential direction; the magnetic column (7) is embedded and mounted in the mounting hole (27), and the first O-ring (3) is mounted in the third annular groove (25); the magnetic column (7), the static ring (2) and the first O-ring (3) constitute a static ring assembly; the surface of the dynamic sealing ring (4) facing the static ring (2) extends out of the outer surface of the dynamic ring (5), and the dynamic ring assembly and the static ring assembly are attached together along the axial direction by magnetic attraction; when relative rotation occurs between the dynamic ring assembly and the static ring assembly, the dynamic sealing ring (4) rubs the surface of the static ring (2) to achieve sealing.

6. The sealing device according to claim 5, characterized in that: The magnetic columns (7) are evenly distributed along the circumference of the static ring (2) at a set angle and embedded in the mounting hole (27).

7. The sealing device according to claim 6, characterized in that: The magnetic column (7) adopts a small cylindrical structure of a permanent magnet.

8. A sealing device, characterized in that: It is installed between the wheel shaft (11) and the flange seat (12), and comprises: a permanent magnet ring (1), a stationary ring (2), a first O-ring (3), a dynamic sealing ring (4), a dynamic ring (5) and a second O-ring (6); the inner surface of the dynamic ring (5) is provided with a first annular groove (23) along the circumferential direction, and the surface of the dynamic ring (5) facing the stationary ring (2) is provided with a second annular groove (24); the dynamic sealing ring (4) is fixed in the second annular groove (24) by press-fitting, and the second O-ring (6) is installed in the first annular groove (23); the dynamic sealing ring (4), the dynamic ring (5) and the second O-ring (6) constitute a dynamic ring assembly; the outer surface of the stationary ring (2) is provided with a third annular groove (25) along the circumferential direction, and the stationary ring (2) comprises an annular housing (2) arranged opposite to each other in the axial direction. 8) and annular shell 2 (9); the surfaces of the annular shell 1 (8) and the annular shell 2 (9) that contact each other are respectively provided with a fourth annular groove (28) and a fifth annular groove (29) that are connected to each other; the permanent magnet ring (1) is embedded and installed in the fourth annular groove (28) and the fifth annular groove (29), and the first O-ring (3) is installed in the third annular groove (25), and the permanent magnet ring (1), the static ring (2) and the first O-ring (3) constitute a static ring assembly; the surface of the dynamic sealing ring (4) facing the static ring (2) extends out of the outer surface of the dynamic ring (5), and the dynamic ring assembly and the static ring assembly are axially attracted and attached together by magnetic force; when relative rotation occurs between the dynamic ring assembly and the static ring assembly, the dynamic sealing ring (4) rubs the surface of the static ring (2) to achieve sealing.

9. The sealing device according to any one of claims 1 to 8, characterized in that: The dynamic ring assembly is installed on the coupling medium side that needs to be sealed. When relative rotation occurs between the flange seat (12) and the wheel shaft (11), relative rotation also occurs between the dynamic ring assembly and the stationary ring assembly. The sealing between the dynamic ring assembly and the stationary ring assembly is achieved through the high flatness and roughness of the sealing end surface between the dynamic sealing ring (4) and the stationary ring (2).

10. The sealing device according to claim 9, characterized in that: The second O-ring (6) can automatically compensate for the wear of the sealing end face through its own elastic torsion and angular floating, and adapt to the movement of the wheel axle (11).

11. The sealing device according to claim 10, characterized in that: When the wheel probe (20) is in operation, a liquid film is maintained between the dynamic sealing ring (4) and the static ring (2) to avoid dry friction between the sealing end faces.

12. A wheel probe, characterized in that: include: A wheel axle (11), a flange seat (12), a pressure ring (13), a transducer seat (14), an ultrasonic sensor (15), a center frame (16), a bearing (17), a radiator (18), a wheel film (19), a wheel probe (20), a bobbin (21), and a sealing device (10) as described in any one of claims 1 to 11; the transducer seat (14) and the radiator (18) are mounted on the center frame (16), and the ultrasonic sensor (15) is mounted on the transducer seat (14); the wheel axle (11) is mounted on one end of the center frame (16) along the axial direction, The bobbin (21) is mounted on the other end of the center frame (16) along the axial direction; two flange seats (12) are respectively sleeved on the wheel shaft (11) and the bobbin (21), and the wheel probe membrane (19) is pressed onto the flange seat (12) through the pressure ring (13), and the wheel probe membrane (19) is filled with wheel probe liquid (31); the flange seat (12) is mounted on the wheel shaft (11) and the bobbin (21) through the bearing (17), and the sealing device (10) is arranged between the wheel shaft (11) and the flange seat (12); the dynamic sealing ring (4) of the sealing device (10) is made of graphite material.

13. The wheel probe according to claim 12, characterized in that: The dynamic ring (5) of the sealing device (10) is made of martensitic stainless steel.

14. The wheel probe according to claim 12 or 13, characterized in that: The first O-ring (3) is interference-fitted with the shaft hole (30) of the flange seat (12) to achieve static sealing, and the second O-ring (6) is interference-fitted with the wheel shaft (11) to achieve static sealing.

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