CN114811053A

CN114811053A - High-temperature-resistant mechanical sealing element

Info

Publication number: CN114811053A
Application number: CN202210271052.7A
Authority: CN
Inventors: 肖婷
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-07-29

Abstract

The invention discloses a high-temperature-resistant mechanical sealing element, and particularly relates to the technical field of sealing elements. The invention ensures that the joint end surfaces of the static ring and the dynamic ring are always jointed together by the acting force generated by the secondary deformation of the first spring and the second spring from the initial compression state, and prevents the leakage between the fluid driven ring and the static ring by matching with the annular diaphragm between the dynamic ring and the static ring.

Description

High-temperature-resistant mechanical sealing element

Technical Field

The invention relates to the technical field of sealing elements, in particular to a high-temperature-resistant mechanical sealing element.

Background

The mechanical seal is a device for preventing fluid leakage, which is formed by at least one pair of end faces perpendicular to a rotation axis, and the end faces are kept in fit and relatively slide under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism and the matching of auxiliary seal, and is commonly used for rotary fluid machines such as pumps, compressors, reaction stirring kettles and the like, and also used for seals of gearboxes, ship tail shafts and the like. The mechanical sealing element mainly comprises four parts, namely a main sealing element (a movable ring and a static ring), an auxiliary sealing element (a sealing ring), a pressing element (a spring and a push ring) and a transmission element (a spring seat and a key or a fixing screw). At present, mechanical seal is connected with quiet ring through being connected with on the equipment mostly, is connected with the rotating ring in the pivot, is provided with the spring in order to guarantee the laminating of rotating ring terminal surface and quiet ring terminal surface at rotating ring and quiet ring in the axial to the rotating ring can rotate for quiet ring.

Although the mechanical sealing element in the prior art has the characteristic of high temperature resistance, under the condition that the rotating shaft rotates, because the dynamic ring axially jumps relative to the static ring, an instant axial gap is generated between the end surface of the dynamic ring and the end surface of the static ring, so that the end surface of the dynamic ring and the end surface of the static ring cannot be always in a joint state, and the mechanical sealing element is easy to leak fluid.

The above information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.

Disclosure of Invention

In order to overcome the above-mentioned drawbacks of the prior art, embodiments of the present invention provide a high temperature resistant mechanical seal, which is configured to enable the joint end surfaces of the stationary ring and the moving ring to be always jointed together by an acting force generated by re-deforming the first spring and the second spring from an initial compression state, and to prevent leakage from occurring between the fluid driven ring and the stationary ring by matching with the annular diaphragm between the moving ring and the stationary ring, so as to solve the above-mentioned problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: a high-temperature-resistant mechanical sealing element comprises a rotating shaft and a shaft sleeve arranged on the rotating shaft, wherein a rotating ring installation seat is sleeved at one end outside the shaft sleeve, a first sinking groove is formed in the inner circumferential surface of the bottom end of the rotating ring installation seat, a rotating ring is sleeved at the position, located at the first sinking groove, of the outer circumferential surface of the shaft sleeve, a transmission assembly and a first sealing ring are arranged between the rotating ring installation seat and the rotating ring, a static ring is sleeved at the bottom, located at the rotating ring, of the outer circumferential surface of the shaft sleeve, an annular membrane is arranged between the rotating ring and the static ring, a positioning ring is sleeved at one end, located away from the rotating ring installation seat, of the outer circumferential surface of the shaft sleeve, a second spring is movably sleeved at the part, located between the static ring and the positioning ring, and a ring plate is fixedly sleeved at the bottom end of the outer circumferential surface of the positioning ring;

the transmission assembly comprises a first counter bore arranged on the top end face of the inner cavity of the first counter bore and a second counter bore arranged on the top end face of the movable ring and corresponding to the first counter bore, a first spring is fixedly connected inside the first counter bore, a transmission pin is fixedly connected to the bottom end of the first spring, the top end of the transmission pin is movably inserted into the first counter bore, and the bottom end of the transmission pin is movably inserted into the second counter bore.

The beneficial effect of adopting the further scheme is that: in the rotating shaft rotating process, the movable ring is utilized to generate axial jumping relative to the static ring, the first spring is enabled to be reset while continuing to compress the second spring, the first spring pushes the movable ring to be close to the static ring, meanwhile, the second spring generates a larger reverse acting force to push the static ring to be close to the movable ring, the static ring and the movable ring are always attached together in the moment that the movable ring generates axial jumping relative to the static ring, and the annular membrane between the movable ring and the static ring is matched to stop leakage at the position between the fluid driven ring and the static ring.

In a preferred embodiment, the first sealing ring is arranged in an inverted step-shaped structure, a second sinking groove is formed in the inner circumferential surface of the top end of the movable ring, and the bottom end of the first sealing ring is inserted into the second sinking groove.

The beneficial effect of adopting the further scheme is that: and multi-stage sealing between the movable ring and the movable ring mounting seat is realized through the first sealing ring with the stepped structure.

In a preferred embodiment, the inner circumferential surface of the annular diaphragm is fixedly connected with the outer circumferential surface of the sleeve.

The beneficial effect of adopting the further scheme is that: the displacement of the annular diaphragm is ensured when the dynamic ring and the static ring synchronously move axially.

In a preferred embodiment, the outer peripheral surface of the rotating ring mounting seat is provided with a plurality of first mounting holes uniformly distributed in an annular shape, and the rotating ring mounting seat is mounted on the outer peripheral surface of the shaft sleeve by passing a locking bolt through the first mounting holes.

The beneficial effect of adopting the further scheme is that: the installation points can be uniformly stressed, and the stability of connection between the movable ring installation seat and the shaft sleeve is improved.

In a preferred embodiment, a plurality of second mounting holes which are annularly arranged are vertically formed in the outer edge position of the top end face of the ring plate in a penetrating mode.

The beneficial effect of adopting the further scheme is that: the positioning ring is used for fixing the positioning ring, so that the abutting position of the static ring is more stable.

In a preferred embodiment, the bottom end surface of the driving pin and the bottom end surface of the inner cavity of the second counter bore are both arranged in an arc shape.

The beneficial effect of adopting the further scheme is that: the alignment time between the transmission pin and the second counter bore when the movable ring is assembled inside the movable ring mounting seat can be reduced.

In a preferred embodiment, the opposite sides of the stationary ring and the positioning ring are both provided with annular grooves, two ends of the second spring respectively extend into the annular grooves at corresponding positions, and the spiral direction of the second spring is the same as the rotation direction of the rotating shaft.

The beneficial effect of adopting the further scheme is that: the two ends of the second spring are accommodated through the two annular grooves, the stability of the second spring in the use process is improved, in addition, the spiral direction of the second spring is the same as the rotating direction of the rotating shaft, and the torsional resistance of the second spring when the moving ring axially jumps relative to the static ring can be greatly reduced.

The invention has the technical effects and advantages that:

1. the movable ring is axially jumped relative to the static ring, so that the first spring is reset and the second spring is continuously compressed, the first spring pushes the movable ring to approach the static ring, and the second spring generates a larger reverse acting force to push the static ring to approach the movable ring, so that the joint end surfaces of the static ring and the movable ring are always attached together at the moment when the movable ring axially jumped relative to the static ring, and the leakage between the fluid driven ring and the static ring is avoided by matching with the annular membrane between the movable ring and the static ring;

2. the mounting hole I on the outer peripheral surface of the movable ring mounting seat is additionally provided with the lantern ring for blocking, so that sundries are prevented from falling into the mounting hole I in the use process of the mechanical sealing element, and the inconvenience in later-period disassembly and assembly of the movable ring mounting seat is further caused.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of the movable ring mounting base of the present invention.

Fig. 3 is a schematic view of the structure of the rotating ring of the present invention.

Fig. 4 is an enlarged view of a portion a of fig. 1 according to the present invention.

Fig. 5 is a schematic view of the overall structure of embodiment 2 of the present invention.

Fig. 6 is a schematic view of the structure of the collar of the present invention.

Fig. 7 is a schematic structural diagram of embodiment 3 of the present invention.

Fig. 8 is a schematic structural view of a second collar of the present invention.

The reference signs are: 1. a rotating shaft; 2. a shaft sleeve; 3. a movable ring mounting seat; 31. sinking a first groove; 32. a first counter bore; 33. a first spring; 34. a drive pin; 4. a moving ring; 41. sinking a second tank; 42. a second counter bore; 5. a first mounting hole; 6. a first sealing ring; 7. a stationary ring; 8. an annular diaphragm; 9. a positioning ring; 10. an annular groove; 11. a second spring; 12. a ring plate; 13. a lantern ring I; 14. a groove; 15. a second lantern ring; 16. a second sealing ring; 17. and a second mounting hole.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more example embodiments. In the following description, numerous specific details are provided to give a thorough understanding of example embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, steps, and so forth. In other instances, well-known structures, methods, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.

Example 1

Referring to the attached drawings 1-4 in the specification, the high-temperature-resistant mechanical sealing element of one embodiment of the invention comprises a rotating shaft 1 and a shaft sleeve 2 arranged on the rotating shaft 1, wherein one end of the outer part of the shaft sleeve 2 is sleeved with a movable ring installation seat 3, the outer peripheral surface of the movable ring installation seat 3 is provided with a plurality of installation holes 5 which are uniformly distributed in an annular shape, the movable ring installation seat 3 is arranged on the outer peripheral surface of the shaft sleeve 2 by penetrating through the installation holes 5 through locking bolts, the inner peripheral surface of the bottom end of the movable ring installation seat 3 is provided with a first sunken groove 31, the outer peripheral surface of the shaft sleeve 2 is sleeved with a movable ring 4 at the position of the first sunken groove 31, a transmission assembly and a first sealing ring 6 are arranged between the movable ring installation seat 3 and the movable ring 4, the first sealing ring 6 is arranged in an inverted ladder-shaped structure, the inner peripheral surface of the top end of the movable ring 4 is provided with a second sunken groove 41, the bottom end of the first sealing ring 6 is inserted into the second sunken groove 41, the outer peripheral surface of the shaft sleeve 2 is arranged at the bottom of the movable ring 4 and is sleeved with a static ring 7, be provided with annular diaphragm 8 between rotating ring 4 and the quiet ring 7, 8 inner peripheral surfaces of annular diaphragm and 2 outer peripheral faces of axle sleeve fixed connection, the pot head that the rotating ring mount pad 3 was kept away from to 2 outer peripheral faces of axle sleeve is equipped with holding ring 9, the partial movable sleeve that 2 outer peripheral faces of axle sleeve are located between quiet ring 7 and holding ring 9 is equipped with two 11 springs, the fixed cover of holding ring 9 periphery bottom end is equipped with crown plate 12, the vertical mounting hole two 17 of seting up a plurality of annular settings that are that run through of crown plate 12 top face outward flange position department.

Furthermore, the transmission assembly comprises a first counter bore 32 arranged on the top end face of the inner cavity of the first counter bore 31 and a second counter bore 42 arranged on the top end face of the movable ring 4 corresponding to the position of the first counter bore 32, a first spring 33 is fixedly connected inside the first counter bore 32, a transmission pin 34 is fixedly connected to the bottom end of the first spring 33, the bottom end face of the transmission pin 34 and the bottom end face of the inner cavity of the second counter bore 42 are both arranged in an arc shape, the top end of the transmission pin 34 is movably inserted into the first counter bore 32, and the bottom end of the transmission pin 34 is movably inserted into the second counter bore 42.

Furthermore, the opposite sides of the stationary ring 7 and the positioning ring 9 are both provided with an annular groove 10, two ends of the second spring 11 respectively extend into the annular grooves 10 at the corresponding positions, and the spiral direction of the second spring 11 is the same as the rotation direction of the rotating shaft 1.

It should be noted that, the moving ring 4 is disposed at one end of the shaft sleeve 2 close to the inside of the mechanical device (that is, the end of the rotating shaft 1 contacting with the fluid medium inside the mechanical device), the stationary ring 7 is disposed at one end of the shaft sleeve 2 far from the inside of the mechanical device, and the ring plate 12 fixed by the bolt stably supports against the stationary ring, the annular diaphragm 8 and the first seal ring 6 are both made of elastic materials, such as nitrile rubber, butadiene rubber, polyurethane rubber, etc. in rubber, which have strong elastic deformability, and can provide a certain deformation amount for the moving ring 4 when moving axially relative to the stationary ring 7 and the moving ring 4 relative to the moving ring mounting seat 3, and after the high temperature resistant mechanical seal is assembled, the initial states of the first spring 33 and the second spring 11 are compressed states, wherein, after the high temperature resistant mechanical seal is assembled on a designated mechanical device, the rotating shaft 1 is driven to rotate, because one end of the transmission pin 34, which is far away from the first counter bore 32, is inserted into the second counter bore 42 at the corresponding position under the restoring force action of the first spring 33 in a pressed state during assembly, synchronous movement of the movable ring 4 and the movable ring mounting seat 3 relative to the stationary ring 7 can be ensured, and because the bottom end face of the transmission pin 34 and the bottom end face of the inner cavity of the second counter bore 42 are both arranged in an arc shape, the alignment time between the transmission pin 34 and the second counter bore 42 when the movable ring 4 is assembled into the movable ring mounting seat 3 can be reduced, during the rotation process of the rotating shaft 1, the moment when the movable ring 4 axially jumps relative to the stationary ring 7 is generated, and the displacement amount generated at the moment when the movable ring 4 axially jumps relative to the stationary ring 7 is utilized, so that the first spring 33 continues to compress the second spring 11 while being reset, the first spring 33 pushes the movable ring 4 to approach the stationary ring 7, and simultaneously, the second spring 11 generates a larger reverse acting force to push the stationary ring 7 to approach the movable ring 4 at the second spring, the realization takes place the axial runout in the twinkling of an eye for quiet ring 7 at rotating ring 4, quiet ring 7 is in the same place with the laminating terminal surface of rotating ring 4 all the time in the laminating, take place to leak in order to avoid the inside fluid medium of mechanical equipment, and further, 8 inner peripheral surfaces of annular diaphragm and axle sleeve 2 fixed mounting that will be located between rotating ring 4 and the quiet ring 7, when making rotating ring 4 and quiet ring 7 take place synchronous axial displacement, utilize annular diaphragm 8's elastic deformation ability to satisfy rotating ring 4 and the required deflection of quiet ring 7 emergence synchronous axial displacement, take place deformation once more by initial compression state with cooperation spring 33 and spring two 11 and further stop the department between fluid driven ring 4 and the quiet ring 7 to take place to leak.

Example 2

Referring to the accompanying

drawings

5 and 6 in the specification, the high-temperature-resistant mechanical seal according to an embodiment of the present invention includes, in addition to the related structures described in embodiment 1, a first collar 13 sleeved outside the moving ring mounting seat 3, and a plurality of annular uniformly distributed grooves 14 are formed in the outer peripheral surface of the first collar 13, so that the first collar 13 is used to block the mounting hole 5 in the outer peripheral surface of the moving ring mounting seat 3, and the first collar 13 can be more conveniently taken and placed by the grooves 14 in the outer peripheral surface of the first collar 13.

It should be noted that the inner peripheral surface of the first collar 13 is tapped with an internal thread, the outer peripheral surface of the movable ring mounting seat 3 is tapped with an external thread adapted to the internal thread, and in addition, an anti-slip stop strip is additionally arranged inside each groove 14, wherein, after the high temperature resistant mechanical seal is assembled on a specified mechanical device, the first collar 13 is screwed onto the movable ring mounting seat 3, and the relative fixation between the first collar 13 and the movable ring mounting seat 3 is realized by using the adapted internal and external threads, so as to prevent impurities from falling into the first mounting hole 5 during the use of the mechanical seal, thereby causing inconvenience in later-stage movable ring seal assembly and disassembly, and during the assembly, one end of the transmission pin 34, which is far away from the first counter bore 32, is inserted into the second counter bore 42 at a corresponding position under the restoring force of the first spring 33 under the compression state, so as to ensure that the movable ring 4 and the movable ring mounting seat 3 synchronously move relative to the stationary ring 7, in the process of driving the rotating shaft 1 to rotate, the moment that the movable ring 4 axially jumps relative to the stationary ring 7, and the first spring 33 continues to compress the second spring 11 while being reset by utilizing the displacement generated at the moment when the movable ring 4 axially jumps relative to the static ring 7, so that the first spring 33 pushes the movable ring 4 to approach the static ring 7, meanwhile, the second spring 11 can generate a larger reverse acting force to push the static ring 7 to approach the dynamic ring 4 when being pressed for the second time, so that the joint end surfaces of the static ring 7 and the dynamic ring 4 are always jointed together at the moment that the dynamic ring 4 axially jumps relative to the static ring 7, so as to avoid the leakage of fluid medium in the mechanical equipment, and further, the elastic deformation capacity of the annular diaphragm 8 is utilized to meet the deformation required by the synchronous axial movement of the movable ring 4 and the static ring 7, so as to further prevent the leakage between the fluid driven ring 4 and the static ring 7 by cooperating with the first spring 33 and the second spring 11 to deform again from the initial compression state.

Example 3

Referring to the accompanying

drawings

7 and 8 in the specification, the high-temperature-resistant mechanical seal according to an embodiment of the present invention includes, in addition to the related structures described in the embodiments 1 and 2, a second collar 15, the second collar 15 is fixedly mounted on the top end surface of the positioning ring 9 through a locking bolt, the top end of the second collar 15 extends to the middle of the outer peripheral surface of the stationary ring 7, a second seal ring 16 is disposed between the inner peripheral surface of the top end of the second collar 15 and the outer peripheral surface of the stationary ring 7, the second seal ring 16 is fixedly mounted on the second collar 15, and the inner peripheral surface of the second seal ring 16 is attached to the outer peripheral surface of the stationary ring 7.

It should be noted that the second sealing ring 16 is made of an elastic material, such as nitrile rubber, butadiene rubber, polyurethane rubber, etc., which are contained in rubber, and the elastic deformability of the rubber is strong, and the inner circumferential surface of the second sealing ring 16 is closely attached to the outer circumferential surface of the stationary ring 7, wherein, when the high temperature resistant mechanical sealing element is assembled on a specified mechanical device, the first sleeve ring 13 is screwed onto the movable ring mounting seat 3, and the relative fixation between the first sleeve ring 13 and the movable ring mounting seat 3 is realized by using the adapted internal and external threads, so as to prevent impurities from falling into the first mounting hole 5 during the use of the mechanical sealing element, which further causes the inconvenience of the later-stage movable ring sealing seat disassembly and assembly, meanwhile, the second sleeve ring 15 is fixedly mounted on the top end surface of the positioning ring 9 by using a locking bolt, and the inner circumferential surface of the second sealing ring 16 is closely attached to the outer circumferential surface of the stationary ring 7, the second spring 11 can be blocked, and in the using process of the mechanical sealing element, sundries are prevented from falling into the second lantern ring 15 and being attached to the surface of the second spring 11, so that the problem of inconvenience in later cleaning is further solved, in the assembling process, one end, far away from the first counter bore 32, of the transmission pin 34 is inserted into the second counter bore 42 in the corresponding position under the restoring force action of the first spring 33 in a pressed state, so that the synchronous movement of the movable ring 4 and the movable ring mounting seat 3 relative to the stationary ring 7 can be ensured, in the rotation process of the driving rotating shaft 1, the moment of axial jumping of the movable ring 4 relative to the stationary ring 7 is generated, and the displacement generated in the moment of axial jumping of the movable ring 4 relative to the stationary ring 7 is utilized, so that the first spring 33 continues to compress the second spring 11 while being reset, the first spring 33 pushes the movable ring 4 to approach the stationary ring 7, and simultaneously, the second spring 11 generates a larger reverse acting force to push the stationary ring 7 to approach the movable ring 4 when being pressed for the second time, the realization takes place the axial runout for quiet ring 7 in the twinkling of an eye at rotating ring 4, and quiet ring 7 is in the same place with the laminating terminal surface of rotating ring 4 all the time in order to avoid the inside fluid medium of mechanical equipment to take place to leak, and further, utilize the elastic deformation ability of annular diaphragm 8 to satisfy rotating ring 4 and quiet ring 7 and take place the required deflection of synchronous axial displacement, take place deformation once more by initial compression state with cooperation spring 33 and spring two 11 and further stop the fluid from taking place to leak between rotating ring 4 and the quiet ring 7.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.

The points to be finally explained are: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed;

secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the invention, only the structures related to the disclosed embodiments are referred to, other structures can refer to common designs, and the same embodiment and different embodiments of the invention can be combined with each other without conflict;

and finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.

Claims

1. The utility model provides a high temperature resistant mechanical seal, includes pivot (1) and installs axle sleeve (2) on pivot (1), its characterized in that: a moving ring mounting seat (3) is sleeved at one end of the outer part of the shaft sleeve (2), a first sinking groove (31) is formed in the inner peripheral surface of the bottom end of the moving ring mounting seat (3), a movable ring (4) is sleeved on the outer peripheral surface of the shaft sleeve (2) at the position of the first sinking groove (31), a transmission assembly and a first sealing ring (6) are arranged between the movable ring mounting seat (3) and the movable ring (4), a static ring (7) is sleeved on the outer peripheral surface of the shaft sleeve (2) at the bottom of the dynamic ring (4), an annular diaphragm (8) is arranged between the dynamic ring (4) and the static ring (7), a positioning ring (9) is sleeved at one end of the peripheral surface of the shaft sleeve (2) far away from the movable ring mounting seat (3), a second spring (11) is movably sleeved on the part of the outer peripheral surface of the shaft sleeve (2) between the static ring (7) and the positioning ring (9), the bottom end of the peripheral surface of the positioning ring (9) is fixedly sleeved with a ring plate (12);

the transmission assembly comprises a first counter bore (32) arranged on the top end face of a first counter bore (31) inner cavity and a second counter bore (42) arranged on the top end face of the movable ring (4) corresponding to the position of the first counter bore (32), a first spring (33) is fixedly connected inside the first counter bore (32), a first transmission pin (34) is fixedly connected to the bottom end of the first spring (33), the top end of the transmission pin (34) is movably inserted into the first counter bore (32), and the bottom end of the transmission pin (34) is movably inserted into the second counter bore (42).

2. A high temperature resistant mechanical seal according to claim 1, wherein: the first sealing ring (6) is of an inverted step-shaped structure, a second sinking groove (41) is formed in the inner peripheral surface of the top end of the movable ring (4), and the bottom end of the first sealing ring (6) is inserted into the second sinking groove (41).

3. A high temperature resistant mechanical seal according to claim 1, wherein: the inner circumferential surface of the annular diaphragm (8) is fixedly connected with the outer circumferential surface of the shaft sleeve (2).

4. A high temperature resistant mechanical seal according to claim 1, wherein: a plurality of mounting holes I (5) which are uniformly distributed in an annular shape are formed in the outer peripheral surface of the movable ring mounting seat (3), and the movable ring mounting seat (3) penetrates through the mounting holes I (5) through a locking bolt to be mounted on the outer peripheral surface of the shaft sleeve (2).

5. A high temperature resistant mechanical seal according to claim 1, wherein: and a plurality of second mounting holes (17) which are annularly arranged are vertically arranged at the outer edge of the top end face of the ring plate (12) in a penetrating manner.

6. A high temperature resistant mechanical seal according to claim 1, wherein: the bottom end face of the transmission pin (34) and the bottom end face of the inner cavity of the counter bore II (42) are both arranged in an arc shape.

7. A high temperature resistant mechanical seal according to claim 1, wherein: and annular grooves (10) are formed in the opposite sides of the static ring (7) and the positioning ring (9), two ends of the second spring (11) extend into the annular grooves (10) in the corresponding positions respectively, and the spiral direction of the second spring (11) is the same as the rotating direction of the rotating shaft (1).