A rotary dynamic sealing device for a tensile heat setting machine

Abstract

The present invention provides a rotary dynamic sealing device for a tension heat setting machine, comprising a housing, a rotary connecting shaft, a rotary sealing ring, a static sealing ring and a short inner tube; the short inner tube is sleeved in the rotary connecting shaft, the rotary connecting shaft is sleeved in the housing, a shaft rotary sealing ring is arranged between the rear end of the rotary connecting shaft and the housing to realize dynamic sealing, the rotary sealing ring is connected to the rotary connecting shaft through a synchronous limit screw to form synchronous operation, the static sealing ring is connected to the end cover through a limit screw to maintain axial micro-movement, the housing is connected to a stationary pipeline through an external thread at the tail, the front end of the rotary connecting shaft is connected to the tension heat setting machine through a flange, and rotates with the tension heat setting machine. The present invention adopts a structural mode in which the short inner tube, the rotary connecting shaft, the rotary sealing ring and the tension heat setting machine are in synchronous operation, which solves the problem of support ring damage caused by the concentricity problem of the inner tube of the dynamic rotary sealing device under high-speed operation.

Description

Technical Field

[0001] The invention relates to the technical field of rotary joints, in particular to a rotary dynamic sealing device of a tension heat setting machine. Background Art

[0002] At present, there are two types of common rotary joints used in tension heat setting machines on the market. One is a spherical rotary joint, which is suitable for steam media and can adapt to a larger amount of swing. This type of rotary joint is currently the main one in use. Since steam is used more as a medium, the inner pipe connecting the equipment and the rotary joint is also longer, resulting in a larger amount of swing. Therefore, many machinery factories will choose a spherical rotary joint. However, due to the structural reasons of the spherical rotary joint, the operating speed of the rotary joint is relatively low, which leads to a lower operating speed of the equipment and lower production efficiency. If it is forced to be in high-speed production, the seal wear of the rotary joint will greatly increase, shortening the service life of the rotary joint. Under high-speed production conditions, the service life of the spherical rotary joint is generally 1 to 3 months.

[0003] like Figure 1 The spherical rotary joint is shown in the figure. The internal seal adopts the front and rear double spherical seal form. It has strong adaptability to steam medium, and there is no balance support between the rotating shaft and the fixed shell, so it has strong anti-swing performance. That is, because there is no balance support, the running speed of this spherical rotary joint is slow, and the maximum suitable running speed can only be used up to 200 rpm. When it is forced to exceed, it is easy to aggravate the swing of the rotary joint, accelerate the wear of the sealing ring and cause a sharp reduction in life. In addition, the long inner tube connecting the rotary joint and the equipment is more than three meters long. Although the long inner tube will be supported on the equipment, the inner tube will be eccentric due to its excessive length, and this eccentricity will be eccentric in the direction of the fixed roller of the equipment due to the limitation of the internal support of the equipment. When the inner tube cooperates with the rotary joint, the rotating shaft of the rotary joint will swing a lot, which will accelerate the wear of the sealing ring. In severe cases, the sealing surface will be directly detached and leak.

[0004] The other type uses a flat rotary joint, which is suitable for water media and can adapt to higher rotation speeds. Currently, this type of rotary joint is used in equipment with faster production speeds. However, this type of rotary joint has high requirements for the working conditions. First of all, this type of flat rotary joint is supported by bearings, and has high requirements for the concentricity of the rotary joint and equipment installation. Secondly, the length of the inner tube connecting the rotary joint and the equipment is more than three meters, which will cause deflection, especially when it is matched on the shell of the rotary joint. The deflection phenomenon is particularly serious. The rigid extrusion and deflection of the inner tube will greatly shorten the service life of the rotary joint.

[0005] like Figure 2The figure shows a flat rotary joint. The internal seal adopts a flat seal form, which has strong adaptability to water media, and there are double ball bearings between the rotating shaft and the fixed shell as a balance support. Therefore, this flat rotary joint can run at a relatively high speed, and the maximum suitable operation may be up to 800 rpm. However, this rotary joint has high requirements for the working conditions. First of all, this flat rotary joint is supported by bearings, and has high requirements for the concentricity of the installation between the rotary joint, machinery and equipment, and the connecting inner tube. Secondly, the length of the connecting inner tube between the rotary joint and the equipment is more than three meters, which will cause deflection, especially when it is matched on the shell of the rotary joint. The deflection phenomenon is particularly serious. The rigid extrusion of the inner tube can easily cause the sealing plane of the rotary joint to disengage during use, causing leakage. Even if the sealing surface is not disengaged, long-term deflection will also cause a serious burden on the ball bearing, and the balls in the bearing will often fall off and be damaged. In addition, the sealing surface will also be aggravated by wear due to the deflection problem, which will greatly shorten the service life of the rotary joint. Summary of the invention

[0006] In order to solve the above-mentioned deficiencies of the prior art, the object of the present invention is to provide a rotary dynamic sealing device for a tension heat setting machine to overcome the defects in the prior art.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a rotary dynamic sealing device for a tension heat setting machine, the rotary dynamic sealing device for a tension heat setting machine comprises a shell, a rotary connecting shaft, a rotary sealing ring, a static sealing ring, an end cover, a pressure cover and a short inner tube; wherein the short inner tube is sleeved in the rotary connecting shaft, the rotary connecting shaft is sleeved in the shell, a shaft rotary sealing ring is arranged between the rear end outer ring surface of the rotary connecting shaft and the shell to realize dynamic sealing, the rotary sealing ring is sleeved on the front outer ring surface of the rotary connecting shaft, and the rotary sealing ring is connected to the rotary connecting shaft through a synchronous limit screw to form synchronous operation; the static sealing ring is sleeved on the front outer ring surface of the rotary connecting shaft, a sealing surface is formed between the static sealing ring and the rotary sealing ring, and the static sealing ring is sleeved through a limit screw The screw is connected to the end cover to maintain axial micro-movement, the end cover is locked on the shell by bolts, and the pressure cover is locked on the end cover by limit screws; the rear inner wall of the shell and the inner wall of the short inner tube constitute the first direct current channel; the inner cavity of the rotating connecting shaft, the inner cavity of the shell, the outer wall of the rotating sealing ring, the outer wall of the static sealing ring, the inner wall of the end cover, the outer wall of the sealing gasket and the outer wall of the short inner tube constitute the second circulation channel; the shell is connected to the stationary pipeline through the external thread at the rear, and the front end of the rotating connecting shaft is connected to the tension heat setting machine through a flange, and rotates with the tension heat setting machine, so that the short inner tube, the rotating connecting shaft, the rotating sealing ring and the tension heat setting machine are in synchronous operation, and the medium is transmitted from the stationary end to the tension heat setting machine.

[0008] Through the above technical scheme, a structural mode in which a short inner tube, a rotating connecting shaft, a rotating sealing ring and a tension heat setting machine are in synchronous operation is adopted, and the form in which the inner tube of the traditional rotary joint is supported on the shell as a single-side medium channel is cancelled. This solves the problem of the inner tube scratching against the outer surface due to the concentricity problem of the inner tube of the dynamic rotary sealing device under high-speed operation, and the inner tube hitting the sealing ring or the support ring being damaged due to the eccentricity of the inner tube. In addition, the synchronous operation of the inner tube and the rotating shaft facilitates the user's installation of the dynamic rotary sealing device, making the installation more convenient and simple, facilitating customer maintenance, and improving production efficiency.

[0009] As a further explanation of the rotary dynamic sealing device of the tension heat setting machine described in the present invention, preferably, a first disc spring is arranged at the rear of the rotating connecting shaft to serve as the main compensation for seal wear; a second disc spring is arranged between the rotating connecting shaft and the rotating sealing ring to serve as the secondary compensation for seal wear and flatness adjustment; a third disc spring is arranged between the static sealing ring and the end cover to serve as the tertiary compensation for seal wear and flatness adjustment.

[0010] Through the above technical solution, the rotating connecting shaft adopts a large disc spring for sealing compensation, and the rotating sealing ring and the static sealing ring adopt two small disc springs for auxiliary supplementation and plane micro-compensation of the sealing surface, thereby ensuring the sealing reliability of the dynamic sealing device, and realizing the alternating use of steam and hot water as two media, which is convenient for maintenance and replacement.

[0011] As a further description of the rotary dynamic sealing device of the tension heat setting machine described in the present invention, preferably, a high-temperature thrust bearing is provided at the rear of the rotating connecting shaft to serve as a rear dynamic balancing support, and a double deep groove ball bearing is provided at the front of the rotating connecting shaft to serve as a front dynamic balancing support.

[0012] Through the above technical solution, the rear part of the rotating connecting shaft is supported by a high-temperature thrust bearing, and the front part is supported by a double deep groove ball bearing, making the operation smoother.

[0013] As a further explanation of the rotary dynamic sealing device of the tension heat setting machine described in the present invention, preferably, the high-temperature thrust bearing is located between the housing and the first disc spring, the double deep groove ball bearing is located between the end cover and the pressure cover, the double deep groove ball bearings are separated by bearing spacers, and a TC skeleton oil seal is arranged between the pressure cover and the rotating connecting shaft.

[0014] As a further description of the rotary dynamic sealing device of the tension heat setting machine described in the present invention, preferably, a first O-ring is provided between the rotary connecting shaft and the rotary sealing ring as a sliding seal.

[0015] Through the above technical solution, the sealing reliability between the rotating connecting shaft and the rotating sealing ring is increased.

[0016] As a further illustration of the rotary dynamic sealing device of the tension heat setting machine described in the present invention, preferably, a second O-ring is provided between the static sealing ring and the end cover as a sliding seal.

[0017] Through the above technical solution, the sealing reliability between the static sealing ring and the end cover is increased.

[0018] As a further illustration of the rotary dynamic sealing device of the tension heat setting machine of the present invention, preferably, a sealing gasket is provided between the shell and the end cover as a static seal.

[0019] Through the above technical solution, the sealing reliability between the shell and the end cover is increased.

[0020] As a further explanation of the rotary dynamic sealing device of the tension heat setting machine described in the present invention, preferably, one end of the short inner tube is threadedly connected to the inner ring surface of the rear end of the rotating connecting shaft, and the other end of the short inner tube is supported on the inner ring surface of the front end of the rotating connecting shaft and protrudes outside the rotating connecting shaft, and the protruding position is connected to the inner tube of the tension heat setting machine and is sealed by a third O-ring.

[0021] Through the above technical scheme, the short inner tube, the rotating connecting shaft, the third O-ring, the roller of the tension heat setting machine and the long inner tube of the tension heat setting machine are in a synchronous operation state, so whether it is steam medium or hot water medium, it has high sealing reliability and high utilization rate of heat transfer.

[0022] As a further description of the rotary dynamic sealing device of the tension heat setting machine described in the present invention, preferably, a V-shaped labyrinth cavity is provided between the rotary sealing ring and the rotary connecting shaft, and between the static sealing ring and the rotary connecting shaft.

[0023] Through the above technical scheme, due to the design of the sealing structure in the rotary sealing device of the tension heat setting machine, the circulating medium will be above the sealing surface composed of the rotating sealing ring and the static sealing ring. If leakage occurs, the liquid will penetrate to the bottom of the sealing surface. A V-shaped labyrinth cavity is arranged between the rotating sealing ring and the rotating connecting shaft, and a V-shaped labyrinth cavity is also arranged between the static sealing ring and the rotating connecting shaft. When the sealing surface rotates, the leaking medium flows through the labyrinth cavities on the left and right sides. Each labyrinth cavity will reduce the flow rate of the leaking medium and increase the temperature in the cavity. The pressure energy and kinetic energy in the medium are converted into heat energy, which eventually causes the medium to volatilize.

[0024] The beneficial effects of the present invention are as follows: the present invention adopts a structural mode in which a short inner tube, a rotating connecting shaft, a rotating sealing ring and a tension heat setting machine are in synchronous operation, and the form in which the inner tube of the traditional rotary joint is supported on the shell as a single-side medium channel is eliminated. This solves the problem that the inner tube of the dynamic rotary sealing device is scratched against the outer surface due to the concentricity problem of the inner tube in the high-speed operation state, and the inner tube hits the sealing ring or the support ring is damaged due to the eccentricity of the inner tube. In addition, the synchronous operation of the inner tube and the rotating shaft facilitates the user's installation of the dynamic rotary sealing device, making the installation more convenient and simple, facilitating customer maintenance, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a schematic diagram of the structure of a spherical rotary joint installed on a tension heat setting machine in the prior art.

[0026] Figure 2 The present invention is a schematic diagram of the structure of a planar rotary joint installed on a tension heat setting machine in the prior art.

[0027] Figure 3 It is a structural schematic diagram of the rotary dynamic sealing device of the tension heat setting machine of the present invention.

[0028] Figure 4 It is a schematic diagram of the structure of the V-shaped labyrinth cavity between the rotating sealing ring, the static sealing ring and the rotating connecting shaft of the present invention.

[0029] Description of reference numerals:

[0030] Housing 1, shaft rotating seal ring 2, high temperature thrust bearing 3, first disc spring 4, rotating connecting shaft 5, first O-ring 6, second disc spring 7, rotating seal ring 8, synchronous limit screw 9, limit screw 10, static seal ring 11, sealing gasket 12, third disc spring 13, second O-ring 14, end cover 15, bearing spacer 16, double deep groove ball bearing 17, pressure cover 18, TC skeleton oil seal 19, short inner tube 20, third O-ring 21, sealing surface 22 and V-shaped labyrinth cavity 23. DETAILED DESCRIPTION

[0031] In order to further understand the structure, features and other purposes of the present invention, the preferred embodiments are described in detail with reference to the accompanying drawings as follows. The embodiments described in the drawings are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention.

[0032] like Figure 1As shown, a rotary dynamic sealing device of a tension heat setting machine includes a shell 1, a rotary connecting shaft 5, a rotary sealing ring 8, a static sealing ring 11, an end cover 15, a pressure cover 18 and a short inner tube 20; wherein the short inner tube 20 is sleeved in the rotary connecting shaft 5, the rotary connecting shaft 5 is sleeved in the shell 1, a shaft rotary sealing ring 2 is arranged between the rear end outer ring surface of the rotary connecting shaft 5 and the shell 1 to achieve dynamic sealing, the rotary sealing ring 8 is sleeved on the front outer ring surface of the rotary connecting shaft 5, and the rotary sealing ring 8 is connected to the rotary connecting shaft 5 through a synchronous limit screw 9 to form synchronous operation; the static sealing ring 11 is sleeved on the front outer ring surface of the rotary connecting shaft 5, a sealing surface 22 is formed between the static sealing ring 11 and the rotary sealing ring 8, the static sealing ring 11 is connected to the end cover 15 through a limit screw 10 to maintain axial micro-movement, the end cover 15 is locked on the shell 1 by bolts, and the pressure cover 18 is locked on the end cover 15 by a limit screw.

[0033] In the above structure, the rear inner wall of the shell 1 and the inner wall of the short inner tube 20 constitute a first direct current channel; the inner cavity of the rotating connecting shaft 5, the inner cavity of the shell 1, the outer wall of the rotating sealing ring 8, the outer wall of the static sealing ring 11, the inner wall of the end cover 18, the outer wall of the sealing gasket 12 and the outer wall of the short inner tube 20 constitute a second circulation channel, realizing the transmission of the medium from the static end to the tension heat setting machine.

[0034] In the above structure, the shell 1 is connected to the stationary pipe through the external thread at the rear, and the front end of the rotating connecting shaft 5 is connected to the tension heat setting machine through the flange, and rotates with the tension heat setting machine, so that the short inner tube 20, the rotating connecting shaft 5, the rotating sealing ring 8 and the tension heat setting machine are in synchronous operation, and the form in which the inner tube of the traditional rotary joint is supported on the shell as a single-side medium channel is cancelled, and the problem of the inner tube of the dynamic rotary sealing device scratching the outer surface due to the concentricity problem of the inner tube in the high-speed operation state is solved, and the inner tube hits the sealing ring or the support ring is damaged due to the eccentricity of the inner tube. In addition, the synchronous operation of the inner tube and the rotating shaft facilitates the user to install the dynamic rotary sealing device, making the installation more convenient and simple, facilitating customer maintenance, and improving production efficiency.

[0035] Preferably, one end of the short inner tube 20 is threadedly connected to the inner ring surface of the rear end of the rotating connecting shaft 5, and the other end of the short inner tube 20 is supported on the inner ring surface of the front end of the rotating connecting shaft 5 and protrudes from the rotating connecting shaft 5, and the protruding position is connected to the inner tube of the tension heat setting machine and sealed by the third O-ring 21. Since a shaft rotating seal 2 is provided between the outer ring surface of the rear end of the rotating connecting shaft 5 and the housing 1 to achieve dynamic sealing, the short inner tube, the rotating connecting shaft, the third O-ring, the roller of the tension heat setting machine and the long inner tube of the tension heat setting machine are in a synchronous operation state, so whether it is a steam medium or a hot water medium, it has a high sealing reliability and a high utilization rate of heat transfer.

[0036] Preferably, a high-temperature thrust bearing 3 is provided at the rear of the rotary connecting shaft 5 as a rear dynamic balance support, and the high-temperature thrust bearing 3 is located between the housing 1 and the first disc spring 4. A double deep groove ball bearing 17 is provided at the front of the rotary connecting shaft 5 as a front dynamic balance support, and the double deep groove ball bearings 17 are separated by a bearing spacer 16, and the double deep groove ball bearings 17 are located between the end cover 15 and the gland 18, and a TC skeleton oil seal 19 is provided between the gland 18 and the rotary connecting shaft 5. The rear of the rotary connecting shaft is supported by a high-temperature thrust bearing, and the front is supported by a double deep groove ball bearing, so that the operation is smoother.

[0037] Preferably, a first disc spring 4 is provided at the rear of the rotating connecting shaft 5 as the main compensation for seal wear. The first disc spring 4 provides thrust for the main seal wear compensation forward, and can press the high-temperature thrust bearing 3 backward to eliminate the clearance of the high-temperature thrust bearing 3, thereby ensuring the smoothness of rotation. A second disc spring 7 is provided between the rotating connecting shaft 5 and the rotating sealing ring 8 as a secondary compensation for seal wear and flatness adjustment. The second disc spring 7 serves as a second thrust (smaller) for seal wear compensation, and on the other hand, can adjust the plane of the rotating sealing ring 8 and the static sealing ring 11 when they are in contact and friction sealing. A third disc spring 13 is provided between the static sealing ring 11 and the end cover 15 as a tertiary compensation for seal wear and flatness adjustment. The third disc spring 13 serves as a reverse thrust (smaller) for the third thrust for seal wear compensation, and on the other hand, can reversely adjust the plane of the rotating sealing ring 8 and the static sealing ring 11 when they are in contact and friction sealing. The rotating connecting shaft adopts a large disc spring for sealing compensation, and the rotating sealing ring and the static sealing ring adopt two small disc springs for auxiliary supplementation and plane micro-compensation of the sealing surface, which ensures the sealing reliability of the dynamic sealing device, enables the alternating use of steam and hot water as two media, and is easy to maintain and replace.

[0038] In addition, a first O-ring 6 is provided between the rotary connection shaft 5 and the rotary sealing ring 8 as a sliding seal. A second O-ring 14 is provided between the static sealing ring 11 and the end cover 15 as a sliding seal. A sealing gasket 12 is provided between the housing 1 and the end cover 15 as a static seal.

[0039] like Figure 4As shown, a V-shaped labyrinth cavity 23 is provided between the rotary sealing ring 8 and the rotary connecting shaft 5, and between the static sealing ring 11 and the rotary connecting shaft 5. Due to the design of the sealing structure in the rotary sealing device of the tension heat setting machine, the circulating medium will be above the sealing surface composed of the rotary sealing ring and the static sealing ring. If leakage occurs, the liquid will penetrate below the sealing surface, and a V-shaped labyrinth cavity is provided between the rotary sealing ring and the rotary connecting shaft, and a V-shaped labyrinth cavity is also provided between the static sealing ring and the rotary connecting shaft. When the sealing surface rotates, the leaking medium flows through the labyrinth cavities on the left and right sides. Each labyrinth cavity will reduce the flow rate of the leaking medium, increase the temperature in the cavity, and the pressure energy and kinetic energy in the medium are converted into heat energy, which eventually causes the medium to volatilize.

[0040] The use parameters of the rotary dynamic sealing device of the tension heat setting machine of the present invention are:

[0041] ①. Medium: hot water and steam (can be used alternately);

[0042] ②, Maximum speed: 3500 rpm;

[0043] ③. Maximum temperature: 300℃;

[0044] ④. Maximum pressure: 2.0Mpa.

[0045] The invention improves the applicability of the rotary sealing device of the tension heat setting machine to water and steam by changing the internal structure of the rotary sealing device of the tension heat setting machine and replacing the sealing material; on the other hand, the connection mode of the inner tube between the rotary sealing device of the tension heat setting machine and the tension heat setting machine is changed, and the rotary joint is changed to a self-contained short inner tube to be connected with the long inner tube in the tension heat setting machine, so that the relative friction motion between the inner tube and the support ring is converted into a relatively static synchronous rotation motion, thereby extending the service life of the rotary sealing device of the tension heat setting machine, reducing the maintenance cost and improving the economic benefit.

[0046] It should be noted that the above invention content and specific implementation methods are intended to demonstrate the practical application of the technical solution provided by the present invention and should not be interpreted as limiting the scope of protection of the present invention. Those skilled in the art can make various modifications, equivalent substitutions or improvements within the spirit and principles of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

Claims

1. A rotary dynamic sealing device for a tension heat setting machine, characterized in that: The rotary dynamic sealing device of the tension heat setting machine comprises a housing (1), a rotary connecting shaft (5), a rotary sealing ring (8), a static sealing ring (11), an end cover (15), a gland (18) and a short inner tube (20); wherein: The short inner tube (20) is sleeved in the rotary connecting shaft (5), and the rotary connecting shaft (5) is sleeved in the housing (1). A shaft rotary sealing ring (2) is provided between the rear end outer ring surface of the rotary connecting shaft (5) and the housing (1) to achieve dynamic sealing. The rotary sealing ring (8) is sleeved on the front outer ring surface of the rotary connecting shaft (5), and the rotary sealing ring (8) is connected to the rotary connecting shaft (5) through a synchronous limit screw (9) to form synchronous operation; A static sealing ring (11) is sleeved on the front outer ring surface of the rotating connecting shaft (5), a sealing surface (22) is formed between the static sealing ring (11) and the rotating sealing ring (8), the static sealing ring (11) is connected to the end cover (15) via a limit screw (10) to maintain axial micro-movement, the end cover (15) is locked on the housing (1) via bolts, and the pressure cover (18) is locked on the end cover (15) via a limit screw; The rear inner wall of the housing (1) and the inner wall of the short inner tube (20) form a first direct current channel; The inner cavity of the rotating connecting shaft (5), the inner cavity of the housing (1), the outer wall of the rotating sealing ring (8), the outer wall of the static sealing ring (11), the inner wall of the end cover (15), the outer wall of the sealing gasket (12) and the outer wall of the short inner tube (20) form a second circulation channel; The housing (1) is connected to a stationary pipe via an external thread at the rear end, and the front end of the rotary connecting shaft (5) is connected to a tension heat setting machine via a flange and rotates along with the tension heat setting machine, so that the short inner tube (20), the rotary connecting shaft (5), the rotary sealing ring (8) and the tension heat setting machine are in synchronous operation, and the medium is transmitted from the stationary end to the tension heat setting machine.

2. The rotary dynamic sealing device of the tension heat setting machine according to claim 1, characterized in that: A first disc spring (4) is arranged at the rear of the rotating connection shaft (5) to serve as a primary compensation for seal wear; a second disc spring (7) is arranged between the rotating connection shaft (5) and the rotating seal ring (8) to serve as a secondary compensation for seal wear and flatness adjustment; and a third disc spring (13) is arranged between the static seal ring (11) and the end cover (15) to serve as a tertiary compensation for seal wear and flatness adjustment.

3. The rotary dynamic sealing device of the tension heat setting machine according to claim 2, characterized in that: A high-temperature thrust bearing (3) is arranged at the rear of the rotary connection shaft (5) to serve as a rear dynamic balance support, and a double deep groove ball bearing (17) is arranged at the front of the rotary connection shaft (5) to serve as a front dynamic balance support.

4. The rotary dynamic sealing device of the tension heat setting machine as claimed in claim 3, characterized in that: The high-temperature thrust bearing (3) is located between the housing (1) and the first disc spring (4), the double deep groove ball bearing (17) is located between the end cover (15) and the pressure cover (18), the double deep groove ball bearings (17) are separated by a bearing spacer (16), and a TC skeleton oil seal (19) is provided between the pressure cover (18) and the rotating connection shaft (5).

5. The rotary dynamic sealing device of the tension heat setting machine according to claim 1, characterized in that: A first O-type sealing ring (6) is provided between the rotating connection shaft (5) and the rotating sealing ring (8) as a sliding seal.

6. The rotary dynamic sealing device of the tension heat setting machine according to claim 1, characterized in that: A second O-type sealing ring (14) is arranged between the static sealing ring (11) and the end cover (15) as a sliding seal.

7. The rotary dynamic sealing device of the tension heat setting machine according to claim 1, characterized in that: A sealing gasket (12) is provided between the housing (1) and the end cover (15) as a static seal.

8. The rotary dynamic sealing device of the tension heat setting machine according to claim 1, characterized in that: One end of the short inner tube (20) is threadedly connected to the inner ring surface of the rear end of the rotating connecting shaft (5), and the other end of the short inner tube (20) is supported on the inner ring surface of the front end of the rotating connecting shaft (5) and protrudes outside the rotating connecting shaft (5), and the protruding position is connected to the inner tube of the tension heat setting machine and is sealed by a third O-ring (21).

9. The rotary dynamic sealing device of the tension heat setting machine according to claim 1, characterized in that: A V-shaped labyrinth cavity (23) is provided between the rotating sealing ring (8) and the rotating connecting shaft (5), and between the static sealing ring (11) and the rotating connecting shaft (5).

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