CN218326208U - Rotary shaft sealing structure and sealing device - Google Patents

Abstract

The present disclosure provides a rotary shaft sealing structure and a sealing device, the rotary shaft sealing structure includes: the sealing ring is connected with the rotation shaft in a rotating mode, the sealing ring is arranged between the rotation shaft and the sealing body, a sealing cavity used for placing the sealing ring is formed in the sealing body, the sealing ring is placed behind the sealing cavity, the inner wall of the sealing ring supports against the rotation shaft, the outer wall of the sealing ring supports against the sealing body, an annular cavity is formed in the peripheral wall of the sealing ring, a supporting ring is arranged in the annular cavity, and the supporting ring is limited in the annular cavity by the sealing body. This openly can rely on the contact degree of regulation and control pressure regulation sealing ring and rotation axis, change the contact pressure of contact terminal surface, and then realize the effective regulation and control to sealing performance, possess intelligent regulation and control's characteristics, can improve equipment operating efficiency, guarantee equipment is in high-efficient running state.

Description

Rotary shaft sealing structure and sealing device

Technical Field

The utility model relates to a dynamic seal technical field especially relates to a rotation axis seal structure and sealing device.

Background

At present, the rotary equipment mostly adopts common sealing structures such as mechanical seal, floating ring seal, packing seal and the like, and the complicated sealing working condition brings severe problems of reduced sealing reliability, shortened service life and the like.

SUMMERY OF THE UTILITY MODEL

A primary object of the present disclosure is to provide a sealing structure and a sealing device for a rotating shaft, which at least solve the above technical problems in the prior art.

In order to achieve the above object, a first aspect of the present disclosure provides a rotary shaft sealing structure including: the sealing ring is connected with the rotation shaft in a rotating mode, the sealing ring is arranged between the rotation shaft and the sealing body, a sealing cavity for placing the sealing ring is formed in the sealing body, the sealing ring is placed behind the sealing cavity, the inner wall of the sealing ring is tightly abutted to the rotation shaft, the outer wall of the sealing ring is tightly abutted to the sealing body, an annular cavity is formed in the peripheral wall of the sealing ring, a supporting ring is arranged in the annular cavity, and the supporting ring is limited in the annular cavity by the sealing body.

In an embodiment, at least two annular mounting grooves are provided in an outer peripheral wall of the sealing ring abutting against the sealing body, O-rings are provided in the annular mounting grooves, and the annular mounting grooves are provided on both sides of the annular cavity, respectively.

In an implementation mode, a first pressurizing lip, a second pressurizing lip and a third pressurizing lip are sequentially arranged on the inner side of the sealing ring close to the side wall of the rotating shaft along the axial direction, and the width of the second pressurizing lip is larger than that of the first pressurizing lip and that of the third pressurizing lip.

In an embodiment, the radial thickness of the first, second and third pressure lip is between 4mm and 5 mm.

In an embodiment, a pressurizing opening is radially opened on the sealing body, and the pressurizing opening extends from the outer wall of the sealing body to the sealing cavity.

In an implementation mode, the inner wall of the support ring is provided with a pressure regulating groove, the pressure regulating through hole is radially formed in the support ring, the sealing ring is integrated with the support ring to form an integrated sealing piece, the integrated sealing piece is placed in the sealing cavity, and the pressure regulating groove is communicated with the pressurization port through the pressure regulating through hole.

In an embodiment, a leakage detection port is formed in the bottom of the sealing body in an upward direction, and the leakage detection port extends from the outer wall of the sealing body to the inner wall close to the rotating shaft.

In one embodiment, the seal ring is provided in plurality in series along the axial direction of the rotary shaft.

In a second aspect of the present disclosure, a sealing device is provided, which includes the rotary shaft sealing structure of the first aspect of the present disclosure and a sealing auxiliary device, where the sealing auxiliary device is respectively communicated with the leak detection port and the pressure boost port, so as to detect the degree of sealing leakage through the leak detection port, and according to the degree of sealing leakage, the degree of sealing of the sealing ring is changed by adjusting and controlling the pressure of the input liquid through the pressure boost port.

In an implementation mode, but sealed auxiliary assembly includes relief pressure valve, high-pressure liquid storage pot, high-pressure gas cylinder, controller, electrical control valve, pressure sensor, flowmeter and flow sensor, high-pressure liquid storage pot passes through with high-pressure gas cylinder the parallelly connected back of relief pressure valve is connected to the output of controller, the liquid outlet of high-pressure liquid storage pot is connected to the pressure boost mouth high-pressure liquid storage pot is connected to be provided with electrical control valve and pressure sensor on the pipeline of pressure boost mouth leak hunting mouthful series connection flowmeter and flow sensor, pressure sensor and flow sensor all are connected with the input communication of controller.

This disclosed rotation axis seal structure, its sealed principle rely on fluid pressure inflation or compress tightly the sealed form on the rotation axis face position, rely on the degree of contact of regulation and control pressure regulation sealing ring lip and rotation axis, change the contact pressure of contact surface, and then realize possessing the characteristics of intelligent regulation and control to sealing performance, can improve equipment operating efficiency, ensure that equipment is in high-efficient running state.

It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present disclosure, nor do they limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:

in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

FIG. 1 is a cross-sectional structural schematic view of a single-stage sealed rotary shaft seal arrangement according to an embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view of a seal ring according to an embodiment of the present disclosure;

FIG. 3 is a cross-sectional front view of a seal ring according to an embodiment of the present disclosure;

FIG. 4 is a cross-sectional structural schematic view of a rotary shaft seal arrangement of a secondary seal according to one embodiment of the present disclosure;

FIG. 5 is a schematic view of a seal according to an embodiment of the present disclosure;

fig. 6 is a schematic view of a rotary shaft sealing structure and a sealing auxiliary device connecting structure of a secondary seal according to an embodiment of the present disclosure.

Wherein the figures include the following reference numerals:

1. sealing the body; 11. sealing the cavity; 12. a pressurizing port; 13. detecting a leakage opening; 2. a seal ring; 21. a first pressure lip; 22. a second pumping lip; 23. a third pumping lip; 24. an annular mounting groove; 25. an annular cavity; 3. a support ring; 31. a pressure regulating groove; 32. a pressure regulating through hole; 4. an O-shaped ring; 5. a rotating shaft; 6. sealing the auxiliary equipment; 601. a safety valve; 602. a pressure reducing valve; 603. a high-pressure liquid storage tank; 604. a high pressure gas cylinder; 605. a manual ball valve; 606. a controller; 607. a first electric control valve; 608. a second electric control valve; 609. a first pressure sensor; 610. a second pressure sensor; 611. a first flow meter; 612. a second flow meter; 613. a first flow sensor; 614. a second flow sensor.

Detailed Description

In order to make the objects, features and advantages of the present disclosure more obvious and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The present disclosure provides a sealing device including a rotary shaft sealing structure and a sealing assistance apparatus.

Referring to fig. 1, in an embodiment of the present disclosure, a rotary shaft sealing structure includes: the seal body 1, the rotary shaft 5 and the seal ring 2 are configured such that the seal ring 2 seals the rotary shaft 5 and the seal body 1, while the rotary shaft 5 and the seal body 1 are rotatably connected to each other.

Referring to fig. 1 to 3, specifically, a sealing cavity 11 for placing the sealing ring 2 is formed in the sealing body 1, after the sealing ring 2 is placed in the sealing cavity 11, the inner wall of the sealing ring 2 can abut against the rotating shaft 5, and the outer wall of the sealing ring 2 abuts against the sealing body 1. An annular cavity 25 is formed in the peripheral wall of the sealing ring 2, a supporting ring 3 is arranged in the annular cavity 25, the supporting ring 3 is limited in the annular cavity 25 by the sealing body 1, and the sealing ring 2 can be prevented from excessively deforming outwards in the opposite direction.

Referring to fig. 1 to 3, in the embodiment of the present disclosure, at least two annular mounting grooves 24 are provided on the outer circumferential wall of the sealing body 1, which abuts against the sealing ring 2, the annular mounting grooves 24 are axially provided on both sides of the annular cavity 25, and the O-rings 4 are provided in the annular mounting grooves 24, so as to perform a static sealing function on the connection between the sealing body 1 and the sealing ring 2.

In the embodiment of the present disclosure, the sealing ring 2, the support ring 3 and the O-ring 4 are integrated to form an integrated sealing member, the integrated sealing member is integrally installed in the sealing cavity 11, the integrated sealing member is coaxial with the sealing cavity 11, and the rotating shaft 5 passes through a through hole in the middle of the sealing ring 2.

Referring to fig. 1 to 3, in the embodiment of the present disclosure, a first pressure boost lip 21, a second pressure boost lip 22, and a third pressure boost lip 23 are sequentially arranged along an axial direction on a side wall close to the rotating shaft 5 inside the seal ring 2, a width of the second pressure boost lip 22 is larger than that of the first pressure boost lip 21 and the third pressure boost lip 23, and a leakage medium buffer groove is formed between the first pressure boost lip 21 and the second pressure boost lip 22, and between the second pressure boost lip 22 and the third pressure boost lip 23. The radial thicknesses of the first pressurizing lip 21, the second pressurizing lip 22 and the third pressurizing lip 23 are too thin, which may cause the strength of the sealing ring 2 to be reduced, and affect the service life, and if the radial thicknesses are too large, the deformability of the sealing ring 2 may be reduced, and the use effect may be affected.

Preferably, the axial widths of the first pressurizing lip 21, the second pressurizing lip 22 and the third pressurizing lip 23 are respectively 3.6mm, 7.4mm and 3.6mm; the depth of the leakage medium buffer groove is 4.5mm; the radial thickness of the first, second and third pressurizing lips 21, 22 and 23 is between 4mm and 5 mm.

In this disclosed embodiment, the tetrafluoro material that has good self-lubricating effect is selected for use to the bulk material of sealing ring 2, has less coefficient of friction when can ensure it and rotation axis 5 contact, reduces frictional resistance. However, the material of the sealing ring 2 is not limited to this, and a better material may be selected according to practical situations, which is not limited by the embodiment of the present disclosure.

Referring to fig. 1, in the embodiment of the present disclosure, a pressurization port 12 is radially opened in the sealing body 1, the pressurization port 12 extends from the outer wall of the sealing body 1 to the sealing cavity 11, and the pressurization port 12 may be disposed above or below the rotating shaft 5 as needed. The inner wall of the support ring 3 is provided with a pressure regulating groove 31, and a pressure regulating through hole 32 is formed along the radial direction of the support ring 3, and after the integrated sealing member is placed in the seal cavity 11, the pressure regulating groove 31 is communicated with the pressurization port 12 through the pressure regulating through hole 32.

Referring to fig. 1, in the embodiment of the present disclosure, a leakage detecting port 13 is formed in the bottom of the sealing body 1 in an upward direction, the leakage detecting port 13 extends from the outer wall of the sealing body 1 to the inner wall close to the rotating shaft 5, and the leakage detecting port 13 is disposed right below the sealing body 1, so as to facilitate collection of leakage liquid.

In the embodiment of the disclosure, the sealing structure of the rotating shaft belongs to a bag type contact seal, and has the advantage of interchangeability, and the sealing grade can adopt the form of single-stage sealing or multi-stage series sealing according to the working requirement.

Referring to fig. 4-6, in the embodiment of the present disclosure, the sealing auxiliary device 6 works on the principle of using a gas cap liquid, and the output of the hydraulic pressure is adjustable and controllable for the sealing device. The sealing auxiliary equipment 6 comprises a pressure reducing valve 602, a high-pressure liquid storage tank 603, a high-pressure gas cylinder 604, an electric regulating valve, a pressure sensor, a flowmeter, a flow sensor and a controller 606, wherein a built-in program of the controller 606 comprises a control module, a pressure regulating module, a leakage monitoring module and the like.

Referring to fig. 1 and 5, for a single-stage seal, in the seal auxiliary device 6, a leak detection port 13 is communicated through a flowmeter and a flow sensor to collect data of the leakage amount; the pressure is adjusted by introducing high-pressure liquid into the pressurizing port 12 and by an electric adjusting valve and a pressure sensor. Initial regulation and control hydraulic pressure is introduced into the pressurization port 12, the sealing leakage amount is detected at the leakage detection port 13 and fed back to the controller 606 to change the regulation and control pressure, so that the sealing regulation and control are realized.

Referring to fig. 1, 5 and 6, specifically, the output gas of the high-pressure gas cylinder 604 is quantitatively reduced by the pressure reducing valve 602 and then enters the upper gas phase space of the high-pressure liquid storage tank 603, so as to pressurize the liquid in the high-pressure liquid storage tank 603, the outlet valve of the high-pressure liquid storage tank 603 is manually opened, the output high-pressure liquid enters the pressurization port 12 through the electric regulating valve and the pressure sensor, and the initial regulating pressure P1 is applied to the sealing ring 2. Meanwhile, the medium leaked from the gap between the first pressure lip 21, the second pressure lip 22 and the third pressure lip 23 and the rotating shaft 5 is connected to the flowmeter, the flow sensor and other devices of the sealing auxiliary device 6 through the leakage detecting port 13 to acquire the leakage data, the sealing leakage rate Q1 is obtained and fed back to the controller 606, the controller 606 compares the built-in data table to judge whether the sealing leakage rate is still within the expected leakage rate, if the sealing leakage rate meets the requirement, it is shown that the initial regulation and control pressure P1 meets the requirement at the moment, regulation and control actions are not needed, and the monitoring is continued. If the sealing leakage rate exceeds the expected leakage rate range, the sealing regulation pressure P1 cannot meet the requirement at the moment, the regulation pressure needs to be increased, the outlet pressure reducing valve 602 of the high-pressure gas cylinder 604 is controlled at the moment, the higher regulation pressure P2 is output, the sealing leakage rate Q2 is acquired, at the moment, whether the sealing leakage rate is still within the expected leakage rate is judged again, if the sealing leakage rate returns to the expected range, the regulation is effective, and the monitoring can be continued. If the control action can not return the leakage rate to the preset expected range, the abrasion loss of the sealing ring 2 is considered to be too large, the leakage rate can not be reduced by regulating and controlling the pressure change, and the sealing structure of the rotating shaft should be maintained.

The sealing series stages can be two stages, three stages, four stages, five stages and the like according to the use requirement, and are not listed. A plurality of multistage seals, i.e., seal rings 2, are arranged in series along the axial direction of the rotary shaft 5.

Referring to fig. 1, 4-6, in an embodiment of the present disclosure, a two-stage tandem seal deployment is specifically described as follows:

the seal assisting apparatus 6 used in the two-stage tandem seal includes a relief valve 601, a pressure reducing valve 602, a high-pressure liquid storage tank 603, a high-pressure gas cylinder 604, a manual ball valve 605, a controller 606, a first electric regulator valve 607, a second electric regulator valve 608, a first pressure sensor 609, a second pressure sensor 610, a first flow meter 611, a second flow meter 612, a first flow sensor 613, and a second flow sensor 614.

Specifically, after being connected in parallel through a pressure reducing valve 602, a high-pressure liquid storage tank 603 and a high-pressure gas cylinder 604 are connected to the output end of a controller 606, one end of the high-pressure liquid storage tank 603 connected with the pressure reducing valve 602 is further connected with a safety valve 601, liquid outlets of the high-pressure liquid storage tank 603 are respectively connected to a pressurization port 12 at a first-stage seal and a second-stage seal, a manual ball valve 605 is arranged on a pipeline close to the liquid outlet of the high-pressure liquid storage tank 603 to control whether liquid is discharged or not, and a first electric regulating valve 607 and a first pressure sensor 609 are arranged on a liquid outlet pipeline of the manual ball valve 605 connected to the pressurization port 12 at the first-stage seal; a second electric regulating valve 608 and a second pressure sensor 610 are arranged on a liquid outlet pipeline of the pressurization port 12 where the manual ball valve 605 is connected to the second-stage seal; meanwhile, the first-stage sealing position leakage detecting port 13 is connected in series with the first flowmeter 611 and the first flow sensor 613, the second-stage sealing position leakage detecting port 13 is connected in series with the second flowmeter 612 and the second flow sensor 614, and the first pressure sensor 609, the second pressure sensor 610, the first flow sensor 613 and the second flow sensor 614 are all connected with the input end of the controller 606 in a communication mode.

The output gas of the high-pressure gas bottle 604 is quantitatively reduced by the pressure reducing valve 602 and then enters the upper gas phase space of the high-pressure liquid storage tank 603, the liquid of the high-pressure liquid storage tank 603 is pressurized, the manual valve at the outlet of the high-pressure liquid storage tank 603 is opened, and the output high-pressure liquid enters the pressurization port 12 at the first-stage sealing position through the first electric regulating valve 607 and the first pressure sensor 609; or through the second electrically actuated regulator valve 608 and the second pressure sensor 610 into the boost port 12 at the second stage seal. At the first-stage sealing position, high-pressure liquid is introduced into the pressurization port 12 to apply initial regulation pressure P1 to the sealing ring 2, meanwhile, leaked media in gaps where the first pressurization lip 21, the second pressurization lip 22 and the third pressurization lip 23 are in contact with the rotating shaft 5 are connected to the first flowmeter 611, the first flowmeter sensor 613 and other devices of the sealing auxiliary device 6 through the leakage detection port 13 to perform data acquisition on the leakage amount, a sealing leakage rate Q1 is obtained and fed back to the controller 606, the controller 606 compares the built-in data table to judge whether the leakage rate of the sealing at the moment is still within an expected leakage rate, if the sealing leakage rate meets the requirement, the initial regulation pressure P1 meets the requirement at the moment, regulation and control actions do not need to be performed, and monitoring can be performed continuously. If the sealing leakage rate exceeds the expected leakage rate range, the sealing regulation pressure P1 cannot meet the requirement at the moment, the regulation pressure needs to be increased, the outlet pressure reducing valve 602 of the high-pressure gas cylinder 604 is controlled at the moment, the higher regulation pressure P2 is output, the sealing leakage rate Q2 is acquired, at the moment, whether the sealing leakage rate is still within the expected leakage rate is judged again, if the sealing leakage rate returns to the expected range, the regulation is effective, and the monitoring can be continued. If the control action can not return the leakage rate to the preset expected range, the abrasion loss of the sealing ring 2 is considered to be too large at the moment, the leakage rate can not be reduced by regulating and controlling the pressure change, the second-stage sealing is actively opened at the moment, namely, the second electric regulating valve 608 is opened, and the information that the first-stage sealing part needs to be overhauled is reported.

After the second electric regulating valve 608 is opened, the step of detecting by using the sealing auxiliary device 6 is repeated, specifically, at the second-stage sealing position, the high-pressure liquid is introduced into the pressure increasing port 12 to apply an initial regulating pressure P1' to the sealing ring 2, and meanwhile, the medium leaked from the gap where the first pressure increasing lip 21, the second pressure increasing lip 22, and the third pressure increasing lip 23 contact with the rotating shaft 5 is connected to the second flowmeter 612, the second flowmeter 614, and the like of the sealing auxiliary device 6 through the leak detecting port 13 to perform data acquisition of the leakage amount, so that a sealing leakage rate Q1' is obtained and fed back to the controller 606, and the controller 606 compares the built-in data table to determine whether the sealing leakage rate is still within the expected leakage rate, if the sealing leakage rate meets the requirement, it is indicated that the initial regulating pressure P1' meets the requirement at this time, it is not necessary to perform a regulating action, and the monitoring is continued. If the sealing leakage rate exceeds the expected leakage rate range, the sealing regulation pressure P1' cannot meet the requirement at the moment, the regulation pressure needs to be increased, the pressure reducing valve 602 at the outlet of the high-pressure gas cylinder 604 is controlled at the moment, the higher regulation pressure P2' is output, the sealing leakage rate Q2' is acquired, at the moment, whether the sealing leakage rate is still within the expected leakage rate is judged again, if the sealing leakage rate returns to the expected range, the regulation is effective, and the monitoring can be continued. If the control action can not return the leakage rate to the preset expected range, the abrasion loss of the sealing ring 2 is considered to be too large, the leakage rate can not be reduced by regulating and controlling the pressure change, and the sealing structure of the rotating shaft at the second-stage sealing position needs to be maintained. If the subsequent multi-stage sealing mechanism exists, the detection is carried out by analogy in the above method.

It should be noted that, the tightness of the sealing structure of the rotating shaft is adjusted by the pressure of the gas introduced by the sealing auxiliary device 6, so that the degree of compression of the sealing ring 2 is accurately adjusted by a gas pressure control manner, thereby ensuring the sealing between the sealing ring 2 and the rotating shaft 5. The reaction of atmospheric pressure control mode is sensitive quick, does not have the delay, and it can realize the self-tightening effect, even take place wearing and tearing, sealing ring 2 also can carry out automatic compensation, compares with the condition that must rely on operating personnel periodic maintenance among the prior art, and this disclosed embodiment can play better sealed effect, and sealed life is longer.

In the embodiment of the present disclosure, for the adjustment of the sealing performance of the rotary shaft sealing structure by using the sealing auxiliary device 6, a temperature sensor and a pressure sensor may be further added in the rotary shaft sealing structure, the acquired data is dynamically monitored by the sealing auxiliary device 6, the acquired data is compared with a data table preset by the system, a corresponding control instruction is generated, and the output control signal is a corresponding action of the electric control valve.

When the control action can not return the leakage rate to the preset expected range, the current abrasion loss of the sealing ring 2 is determined to be too large, the sealing leakage rate can not be reduced by regulating and controlling the pressurization of the electric regulating valve, the next stage of sealing is actively opened, and the information of the detected sealing stage which needs to be overhauled is reported.

It should be understood that various forms of the flows shown above, reordering, adding or deleting steps, may be used. For example, the steps described in the present disclosure may be executed in parallel, sequentially or in different orders, and are not limited herein as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Directional terms referring to "first direction", "second direction", and the like refer to a straight line direction unless otherwise specifically limited. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.

The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims (10)

1. A rotary shaft seal structure characterized by comprising: seal (1) and setting of rotating the connection with rotation axis (5) are in sealing ring (2) between rotation axis (5) and seal (1), offer on seal (1) and be used for placing sealing ring (2) seal chamber (11), sealing ring (2) place in behind seal chamber (11), the inner wall of sealing ring (2) support tightly in rotation axis (5), the outer wall of sealing ring (2) support tightly in seal (1), annular chamber (25) have been seted up on the periphery wall of sealing ring (2), be provided with support ring (3) in annular chamber (25), support ring (3) quilt seal (1) spacing in annular chamber (25).

2. The rotary shaft sealing structure according to claim 1, wherein at least two annular mounting grooves (24) are provided on an outer peripheral wall of the seal ring (2) abutting against the seal body (1), an O-ring (4) is provided in the annular mounting grooves (24), and the annular mounting grooves (24) are provided on both sides of the annular cavity (25), respectively.

3. The rotary shaft sealing structure according to claim 1, wherein a first pressure lip (21), a second pressure lip (22), and a third pressure lip (23) are arranged in an axial direction in this order on the side wall inside the seal ring (2) close to the rotary shaft (5), and the width of the second pressure lip (22) is larger than the first pressure lip (21) and the third pressure lip (23).

4. The rotary shaft sealing structure according to claim 3, wherein the radial thicknesses of the first pressure lip (21), the second pressure lip (22), and the third pressure lip (23) are between 4mm and 5 mm.

5. The rotary shaft sealing structure according to claim 2, wherein a pressurizing port (12) is formed in the sealing body (1) in a radial direction, and the pressurizing port (12) extends from an outer wall of the sealing body (1) to the seal cavity (11).

6. The rotary shaft sealing structure according to claim 5, wherein a pressure regulating groove (31) is formed in an inner wall of the support ring (3), a pressure regulating through hole (32) is formed in a radial direction of the support ring (3), the sealing ring (2), the support ring (3) and the O-ring (4) are integrated to form an integrated sealing member, and when the integrated sealing member is placed in the sealing cavity (11), the pressure regulating groove (31) is communicated with the pressurization port (12) through the pressure regulating through hole (32).

7. The rotary shaft sealing structure according to claim 1, wherein a leakage detecting opening (13) is formed in a bottom of the sealing body (1) in an upward direction in the radial direction, and the leakage detecting opening (13) extends from an outer wall of the sealing body (1) to a position close to an inner wall of the rotary shaft (5).

8. The rotary shaft sealing structure according to claim 1, wherein the seal ring (2) is provided in plurality in series along an axial direction of the rotary shaft (5).

9. A sealing device, comprising the rotary shaft sealing structure of any one of the preceding claims and a sealing auxiliary device (6), wherein the sealing auxiliary device (6) is respectively communicated with a leakage detecting port (13) and a pressurizing port (12) so as to detect the degree of sealing leakage through the leakage detecting port (13), and change the sealing degree of the sealing ring (2) by regulating the pressure of the input liquid to the pressurizing port (12) according to the degree of sealing leakage.

10. The sealing device according to claim 9, wherein the sealing auxiliary equipment (6) comprises a pressure reducing valve (602), a high-pressure liquid storage tank (603), a high-pressure gas cylinder (604), a controller (606), an electric control valve, a pressure sensor, a flow meter and a flow sensor, the high-pressure liquid storage tank (603) and the high-pressure gas cylinder (604) are connected in parallel through the pressure reducing valve (602) and then connected to an output end of the controller (606), a liquid outlet of the high-pressure liquid storage tank (603) is connected to the pressure boosting port (12), the electric control valve and the pressure sensor are arranged on a pipeline of the high-pressure liquid storage tank (603) connected to the pressure boosting port (12), the flow meter and the flow sensor are connected in series to the leakage detecting port (13), and the pressure sensor and the flow sensor are both connected with an input end of the controller (606) in a communication manner.

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