Mechanical seal device for rotating shafts

Abstract

The application relates to a rotating shaft mechanical sealing device, which comprises a rotating shaft, a shell with a containing cavity in the inside, the rotating shaft extending into the containing cavity, a sealing element comprising a fixed block, a movable ring, a compression ring and a static ring which are sequentially sleeved on the outer periphery of the rotating shaft, the static ring and the fixed block being arranged at both ends in the shell to seal the containing cavity, an elastic element being arranged between the movable ring and the fixed block, a first sealing groove being arranged on the side of the movable ring facing the static ring, a first sealing ring being arranged in the first sealing groove, the compression ring being partially contained in the first sealing groove, and the two ends of the compression ring being respectively abutted with the static ring and the first sealing ring. The first sealing ring is tightly attached to the inner wall of the first sealing groove of the movable ring and the outer wall of the non-through shaft, so that the gap and the protrusion caused by the tolerance or the process defect during the manufacturing of the rotating shaft or the sealing ring can be avoided, and the sealing failure can be avoided. The application with the sealed containing cavity can be adjusted according to the pressure in the containing cavity to adapt to different working scenes with different pressures.

Description

Technical Field

[0001] This invention relates to the field of sealing device technology, and in particular to a mechanical seal device for rotating shafts. Background Technology

[0002] Mechanical seals are a common type of shaft end seal in rotating machinery. Existing mechanical seal devices are typically used for sealing rotating shafts and pump cavities, often operating in atmospheric pressure air or vacuum environments to prevent internal liquid leakage. However, technology for waterproof sealing of internal cavities in high-pressure environments, such as high-pressure gas or liquid environments, is currently lacking. Furthermore, existing sealing devices cannot eliminate gaps or protrusions caused by manufacturing tolerances. This can lead to seal failure or damage to the rigid rotating shaft during use, resulting in internal equipment damage. Summary of the Invention

[0003] Therefore, it is necessary to provide a shaft mechanical seal device to address the problems that existing mechanical seal devices cannot be applied to high-pressure environments such as high-pressure gases or liquids, and the problems that gaps or protrusions caused by tolerances during manufacturing can lead to seal failure or damage to rigid shafts.

[0004] A rotating shaft mechanical seal device, comprising:

[0005] Shaft;

[0006] A housing having an internal cavity into which the rotating shaft extends;

[0007] A sealing element includes a fixed block, a rotating ring, a pressure ring, and a stationary ring sequentially fitted around the outer periphery of the rotating shaft. The stationary ring and the fixed block are disposed at both ends within the housing to seal the receiving cavity. An elastic element is provided between the rotating ring and the fixed block, and the rotating ring is axially slidably fitted around the outer periphery of the rotating shaft. A first sealing groove is provided on the side of the rotating ring facing the stationary ring, and a first sealing ring is provided in the sealing groove. The pressure ring is partially accommodated in the first sealing groove, and both ends of the pressure ring abut against the stationary ring and the first sealing ring, respectively. The first sealing ring undergoes radial deformation under the action of spring elastic force to tightly adhere to the rotating ring and the rotating shaft.

[0008] In one embodiment, the seal further includes an adjusting knob disposed on the side of the stationary ring away from the rotating ring and abutting against the stationary ring. The adjusting knob is disposed within an adjusting port of the housing and is screwed into the adjusting port. The adjusting knob is axially movable within the adjusting port.

[0009] In one embodiment, the stationary ring has a third sealing groove on its outer edge near the adjusting knob, and a third sealing ring is provided in the third sealing groove. The two end faces of the third sealing ring abut against the adjusting knob and the third sealing groove, respectively, and the outer edge and inner edge of the third sealing ring abut against the adjusting port and the third sealing groove, respectively.

[0010] In one embodiment, the adjusting knob is a columnar structure, and a fourth sealing ring is provided between the adjusting knob and the rotating shaft. The two end faces of the fourth sealing ring abut against the adjusting knob and the rotating shaft respectively, and the outer edge of the fourth sealing ring abuts against the stationary ring.

[0011] In one embodiment, the adjusting knob is a ring structure, and the adjusting knob is sleeved on the outer periphery of the rotating shaft.

[0012] In one embodiment, the inner edge of the housing near the fixed block is provided with a threaded groove, and a threaded top block adapted to the threaded groove is provided in the threaded groove, the threaded top block abutting against the fixed block.

[0013] In one embodiment, the outer edge of the fixed block away from the moving ring is provided with a second sealing groove, and a second sealing ring is provided in the second sealing groove. The outer edge and inner edge of the second sealing ring abut against the threaded top block and the second sealing groove, respectively.

[0014] In one embodiment, the fixed block is a sleeve, which is fitted around the outer periphery of the moving ring, and the moving ring portion is accommodated within the sleeve. The elastic element is a spring, and the diameter of the spring is adapted to the inner diameter of the sleeve.

[0015] In one embodiment, the sleeve has a first spring groove on the side facing the moving ring, and the moving ring has a second spring groove on the side facing the sleeve, with the two ends of the spring respectively accommodated in the first spring groove and the second spring groove.

[0016] In one embodiment, a pressure gauge is fixed to the side of the moving ring facing the fixed block, and the pressure gauge extends toward and through the fixed block.

[0017] The aforementioned mechanical seal device for rotating shafts uses elastic force transmitted by an elastic element to cause the first sealing ring to deform and tightly adhere to the inner wall of the first sealing groove of the rotating ring and the outer wall of the rotating shaft. This avoids the seal failure caused by gaps or protrusions due to tolerances or process defects during the manufacturing of the rotating shaft or sealing ring, which can lead to serious damage to the sealing device and the sealed shaft. This application, with its sealing cavity, allows for adjustment of the pressure within the cavity to adapt to different working scenarios with varying pressures. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of a rotating shaft mechanical seal device applicable to a non-through shaft according to an embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional view of a rotating shaft mechanical seal device suitable for a through shaft according to another embodiment of the present invention;

[0020] In the diagram: 1-Non-through shaft; 2-Through shaft; 10-Housing; 11-Mounting ring; 12-Threaded top block; 20-Sleeve; 21-First spring groove; 30-Moving ring; 31-Second spring groove; 32-Spring; 40-Stationary ring; 41-Pressure ring; 50-Adjusting knob; 61-First sealing ring; 62-Second sealing ring; 63-Third sealing ring; 64-Fourth sealing ring. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, the terms "second" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "second" or "third" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the third feature can mean that the second and third features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the third feature can mean that the second feature is directly above or diagonally above the third feature, or simply that the second feature is at a higher horizontal level than the third feature. "Below," "below," and "beneath" of the third feature can mean that the second feature is directly below or diagonally below the third feature, or simply that the second feature is at a lower horizontal level than the third feature.

[0026] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0027] See Figure 1 , Figure 1A cross-sectional view of a mechanical seal device for a non-penetrating shaft according to an embodiment of the present invention is shown. In this embodiment, the shaft to be sealed is a non-penetrating shaft 1. The left end of the non-penetrating shaft 1 is the sealing end, and the right end is the fixed end. A sleeve 20, a rotating ring 30, and a stationary ring 40 are sequentially fitted around the outer periphery of the non-penetrating shaft 1 from right to left. The sleeve 20, rotating ring 30, and stationary ring 40 are all housed within a cylindrical housing 10 having a cylindrical receiving cavity. The housing 10 is coaxially arranged with the non-penetrating shaft 1. The side of the housing 10 facing the fixed end of the non-penetrating shaft 1 has an installation port through which the non-penetrating shaft 1 penetrates the housing 10. An adjustment port is provided at the center of the other end of the housing 10 away from the installation port. The adjustment port has a circular radial cross-section, and the inner wall of the portion of the adjustment port near the sealing end has an internal thread. An adjustment knob 50, which engages with the internal thread, is provided inside the adjustment port. The adjusting knob 50, facing the fixed end, abuts against the stationary ring 40. The stationary ring 40 is an annular structure, partly sleeved on the outer circumference of the non-penetrating shaft 1, and partly accommodated within the adjusting port. The outer diameter of the stationary ring 40 matches the inner diameter of the adjusting port, and the stationary ring 40 abuts against the unthreaded inner wall of the adjusting port, allowing axial sliding within the adjusting port. The non-penetrating shaft 1 passes through the stationary ring 40 and abuts against the adjusting knob 50. The position of the non-penetrating shaft 1 and the stationary ring 40 within the housing 10 can be adjusted by adjusting the adjusting knob. Furthermore, the side of the housing 10 near the fixed end is a mounting base surface, from which an mounting ring 11 extends axially. The mounting ring 11 has several countersunk screw holes to match the mounting holes on the mounting surface, allowing the present application to be mounted on the mounting surface. Pressurizing the sealed accommodating cavity allows the mechanical seal device of the present application to adapt to different pressure scenarios. Furthermore, the non-penetrating shaft 1 is a rigid non-metallic or metallic columnar structure. Specifically, this application applies to sealing applications in environments with pressures of 4 atmospheres or less.

[0028] Continue reading Figure 1A pressure ring 41 is also provided between the moving ring 30 and the stationary ring 40. At the second end of the moving ring 30 facing the sealing end, a first sealing groove is provided on the inner edge of the moving ring 30 near the non-penetrating shaft 1. A portion of the pressure ring 41 is accommodated within the first sealing groove. The pressure ring 41 has an annular structure and is fitted around the outer circumference of the non-penetrating shaft 1. At the bottom of the first sealing groove, i.e., on the side of the pressure ring 41 near the moving ring 30, a first sealing ring 62 is also provided. Both ends of the first sealing ring 62 abut against the pressure ring 41 and the bottom of the first sealing groove, respectively. The end of the pressure ring 41 extending out of the first sealing groove abuts against the stationary ring 40. The moving ring 30 transmits pressure sequentially to the first sealing ring 62, the pressure ring 41, and the stationary ring 40 via the elastic force of the spring 32. The pressure ring 41, under pressure, generates a reaction force on the first sealing ring 62, causing the elastic first sealing ring 62 to undergo radial deformation. The outer and inner edges of the first sealing ring 62 are respectively tightly pressed against the inner wall of the first sealing groove of the moving ring 30 and the outer wall of the non-penetrating shaft 1, thus achieving a sealing effect. Furthermore, the pressure transmitted by the spring 32 within this application causes the first sealing ring 62 to tightly press against the inner wall of the first sealing groove of the moving ring 30 and the outer wall of the non-penetrating shaft 1, which avoids the sealing failure caused by gaps or protrusions due to tolerances or process defects during the manufacturing of the sealing ring or the sealed shaft, which in existing sealing devices can lead to sealing failure, and in severe cases, even damage to the sealing device and the sealed shaft.

[0029] like Figure 1As shown, the sleeve 20 is a hollow sleeve structure with an opening facing the sealing end of the non-penetrating shaft 1. The outer diameter of the sleeve 20 is adapted to the inner diameter of the receiving cavity of the housing 10, and the sleeve 20 can slide axially along the non-penetrating shaft 1 within the receiving cavity. An annular threaded top block 12 is provided at the mounting opening of the housing 10. The outer circumference of the threaded top block 12 has external threads, and the inner edge of the opening has an annular threaded groove. The inner wall of the threaded groove has internal threads adapted to the threaded top block 12, and the threaded top block 12 is screwed into the threaded groove. The inner diameter of the threaded top block 12 is smaller than the outer diameter of the sleeve 20 to limit the movement of the sleeve 20 within the receiving cavity. The threaded top block 12 restricts the sleeve 20 to slide axially only within the receiving cavity, preventing the sleeve 20 from dislodging from the receiving cavity. The sleeve 20 has an annular second sealing groove on its outer edge facing the fixed end. This second sealing groove has axial and radial open surfaces. A second sealing ring 61 is provided within the second sealing groove. The two end faces of the second sealing ring 61 abut against the bottom of the groove and the mounting surface, respectively. The outer and inner edges of the second sealing ring 61 abut against the inner wall of the threaded top block 12 and the groove wall of the second sealing groove, respectively. The thickness of the second sealing ring 61 is slightly greater than the depth of the second sealing groove. The second sealing ring 61 ensures a seal between the housing 10 and the sleeve 20. When the mechanical seal device of this application is installed on the mounting surface, because the thickness of the second sealing ring 61 is slightly greater than the depth of the second sealing groove, the elastic second sealing ring 61 undergoes radial deformation, causing its outer and inner edges to tightly adhere to the inner wall of the threaded top block 12 and the groove wall of the second sealing groove, respectively, thus achieving a sealing effect.

[0030] The moving ring 30 is a ring-shaped structure with a central opening. The moving ring 30 is sleeved around the outer circumference of the non-penetrating shaft 1. The outer diameter of the moving ring 30 is matched with the inner diameter of the sleeve 20. The moving ring 30 can slide axially along the non-penetrating shaft 1 within the sleeve 20. A spring 32 is provided between the moving ring 30 and the bottom of the sleeve 20. The spring 32 is sleeved around the outer circumference of the non-penetrating shaft 1, and its two ends abut against the bottom of the moving ring 30 and the sleeve 20, respectively. Furthermore, the diameter of the spring 32 is matched with the inner diameter of the sleeve 20, and the outer edge of the spring 32 abuts against the inner wall of the sleeve 20 to prevent radial movement of the spring 32 during compression. Furthermore, the bottom of the sleeve 20 is provided with a first spring groove 21 that matches the spring 32. The first spring groove 21 is an annular groove structure, and the end portion of the spring 32 that abuts against the bottom of the sleeve 20 is accommodated in the first spring groove 21. The end face of the moving ring 30 facing the sleeve 20 is provided with a second spring groove 31 that matches the first spring groove 21. The second spring groove 31 is an annular groove structure, and the end portion of the spring 32 that abuts against the moving ring 30 is accommodated in the second spring groove 31. The diameters of the first spring groove 21 and the second spring groove 31 are equal. The two ends of the spring 32 are respectively partially accommodated in the first spring groove 21 and the second spring groove 31, further preventing the spring 32 from radially shifting.

[0031] The stationary ring 40 has an annular third sealing groove on its outer edge near the adjusting knob 50. An annular third sealing ring is located within this groove. The two ends of the third sealing ring abut against the adjusting knob 50 and the bottom of the groove, respectively. The outer and inner edges of the third sealing ring abut against the inner wall of the adjusting port and the wall of the third sealing groove, respectively. The thickness of the third sealing ring is slightly greater than the depth of the third sealing groove. When the stationary ring 40 is subjected to pressure from the moving ring 30, it compresses the third sealing ring 63. The elastic third sealing groove undergoes radial deformation, tightly adhering to the inner wall of the adjusting port on its outer edge and the wall of the third sealing groove on its inner edge, thus achieving a sealing effect.

[0032] A fourth sealing ring 64 is also provided at the sealing end of the non-penetrating shaft 1. The fourth sealing ring 64 has an annular structure, and its two end faces abut against the adjusting knob 50 and the end face of the non-penetrating shaft 1, respectively. The outer edge of the fourth sealing ring 64 abuts against the inner ring wall of the stationary ring 40. The fourth sealing ring 64 is used to ensure the sealing of the end of the non-penetrating shaft 1. In this embodiment, the fourth sealing ring 64 is annular at the sealing end of the non-penetrating shaft 1. However, the fourth sealing ring 64 can also be designed as a circular plate structure according to actual needs, which is not limited here. By adjusting the position of the adjusting knob 50 in the adjusting port, the pressure on the fourth sealing ring 64 can be adjusted. When the pressure on the fourth sealing ring 64 increases, radial deformation will occur, and the outer edge of the fourth sealing ring 64 will be in close contact with the inner ring wall of the stationary ring 40, further improving the sealing effect.

[0033] Specifically, adjusting the position of the adjusting knob 50 in the adjusting port allows adjustment of the elastic force on the moving ring 30 and the internal pressure within the receiving cavity of this application. This allows for adjustment of the internal pressure within the receiving cavity according to different pressure environments, enabling the rotating shaft mechanical seal device of this application to adapt to various pressure conditions. In a stable pressure environment, adjusting the position of the adjusting knob 50 in the adjusting port further compresses the spring 32—increasing the elastic force of the spring 32—to increase the pressure on the second sealing ring 61, the first sealing ring 62, the third sealing ring 63, and the fourth sealing ring 64, thereby further improving the sealing effect. This application, with its sealing receiving cavity, can adapt to different working scenarios with varying pressures by adjusting the pressure within the receiving cavity. The second sealing ring 61 and the third sealing ring 63 at both ends ensure the sealing effect within the sealing cavity, and the pressure within the receiving cavity can be further finely adjusted by adjusting the adjusting knob 50.

[0034] Furthermore, a pressure gauge is provided inside the sleeve 20, which axially penetrates the sleeve 20. One end of the pressure gauge near the sealing end extends into the receiving cavity and is fixedly connected to the rotating ring 30. By measuring the length of the pressure gauge extending out of the mounting opening, the position of the rotating ring 30 in the receiving cavity can be confirmed, and the internal pressure in the receiving cavity can be determined. Furthermore, the surface of the pressure gauge has several graduations, each graduation corresponding to the pressure value in the receiving cavity, allowing the user to directly determine the pressure value in the receiving cavity by observing the pressure gauge graduations relative to the mounting opening.

[0035] See Figure 2 , Figure 2 A cross-sectional view of a mechanical seal device for a through-shaft 2 according to another embodiment of the present invention is shown. In this embodiment, the mechanical seal device for a through-shaft 2 needs to seal the outer circumference of the shaft to be sealed. The shaft is a through-shaft 2. In the figure, the left end of the through-shaft 2 is the through end, and the right end is the fixed end. A sleeve 20, a moving ring 30, a stationary ring 40, and an adjusting knob 50 are sequentially fitted onto the outer circumference of the through-shaft 2 from right to left. The through-shaft 2 penetrates the housing 10, entering through the mounting port on the right side of the housing 10 and exiting through the adjusting port on the left side. The sleeve 20, the moving ring 30, and the stationary ring 40 are all disposed within the cylindrical housing 10, which has a cylindrical receiving cavity. The adjusting port has a circular radial cross-section, and the inner wall of the adjusting port near the through end is provided with an internal thread. An adjusting knob 50, which engages with the internal thread, is provided inside the adjusting port. The adjusting knob 50 has a ring structure. The adjusting knob 50, facing the fixed end, abuts against the stationary ring 40. The stationary ring 40 is an annular structure that fits around the outer circumference of the through shaft 2. A portion of the stationary ring 40 is accommodated within the adjusting port, and the outer diameter of the stationary ring 40 matches the inner diameter of the adjusting port. The stationary ring 40 can slide axially within the adjusting port. The position of the stationary ring 40 within the housing 10 can be adjusted by adjusting the adjusting knob 50. Furthermore, the side of the housing 10 facing the fixed end serves as a mounting base surface, from which an axially extending mounting ring 11 extends. The mounting ring 11 has several countersunk screw holes to mate with mounting holes on the mounting surface, allowing this application to be mounted on the mounting surface.

[0036] Furthermore, the through shaft 2 is a rigid non-metallic or metallic column structure. The through shaft 2 can also be a taut cable structure, which is not limited here.

[0037] The stationary ring 40 has an annular third sealing groove on its outer edge near the adjusting knob 50. An annular third sealing ring is located within this groove. The two ends of the third sealing ring abut against the adjusting knob 50 and the bottom of the groove, respectively. The outer and inner edges of the third sealing ring abut against the inner wall of the adjusting port and the wall of the third sealing groove, respectively. The thickness of the third sealing ring is slightly greater than the depth of the third sealing groove. When the stationary ring 40 is subjected to pressure from the moving ring 30, it compresses the third sealing ring 63. The elastic third sealing groove undergoes radial deformation, tightly adhering to the inner wall of the adjusting port on its outer edge and the wall of the third sealing groove on its inner edge, thus achieving a sealing effect.

[0038] Specifically, adjusting the position of the adjusting knob 50 in the adjusting port allows adjustment of the elastic force on the moving ring 30 and the internal pressure within the receiving cavity of this application. This allows the internal pressure within the receiving cavity to be adjusted according to different pressure environments, enabling the rotating shaft mechanical seal device of this application to adapt to various pressure conditions. In a stable pressure environment, adjusting the position of the adjusting knob 50 in the adjusting port further compresses the spring 32—increasing the elastic force of the spring 32—to increase the pressure on the second sealing ring 61, the first sealing ring 62, and the third sealing ring 63, thereby further improving the sealing effect.

[0039] The technical features of the above-described embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A mechanical seal device for a rotating shaft, characterized in that, The rotating shaft mechanical seal device includes: Shaft; A housing having an internal cavity into which the rotating shaft extends; A sealing element includes a fixed block, a rotating ring, a pressure ring, and a stationary ring sequentially fitted around the outer periphery of the rotating shaft. The stationary ring and the fixed block are disposed at both ends within the housing to seal the receiving cavity. An elastic element is provided between the rotating ring and the fixed block. The rotating ring is axially slidably fitted around the outer periphery of the rotating shaft. A first sealing groove is provided on the side of the rotating ring facing the stationary ring. A first sealing ring is provided in the sealing groove. The pressure ring is partially accommodated in the first sealing groove, and both ends of the pressure ring abut against the stationary ring and the first sealing ring, respectively. The first sealing ring undergoes radial deformation under the action of the elastic element to tightly adhere to the rotating ring and the rotating shaft. The inner edge of the housing near the fixed block is provided with a threaded groove, and a threaded top block adapted to the threaded groove is provided in the threaded groove, and the threaded top block abuts against the fixed block; The fixed block has a second sealing groove at its outer edge away from the moving ring. A second sealing ring is provided in the second sealing groove. The outer edge and inner edge of the second sealing ring abut against the threaded top block and the second sealing groove, respectively.

2. The mechanical seal device for a rotating shaft according to claim 1, characterized in that, The sealing element further includes: an adjusting knob, which is disposed on the side of the stationary ring away from the rotating ring and abuts against the stationary ring; the adjusting knob is disposed in the adjusting port of the housing; the adjusting knob is screwed into the adjusting port; and the adjusting knob can move axially within the adjusting port.

3. The mechanical seal device for a rotating shaft according to claim 2, characterized in that, The stationary ring has a third sealing groove on its outer edge near the adjustment knob. A third sealing ring is provided in the third sealing groove. The two end faces of the third sealing ring abut against the adjustment knob and the third sealing groove, respectively. The outer edge and inner edge of the third sealing ring abut against the adjustment port and the third sealing groove, respectively.

4. The mechanical seal device for a rotating shaft according to claim 2, characterized in that, The adjusting knob has a columnar structure, and a fourth sealing ring is provided between the adjusting knob and the rotating shaft. The two end faces of the fourth sealing ring abut against the adjusting knob and the rotating shaft respectively, and the outer edge of the fourth sealing ring abuts against the stationary ring.

5. The mechanical seal device for a rotating shaft according to claim 2, characterized in that, The adjusting knob has a ring structure and is sleeved on the outer circumference of the rotating shaft.

6. The mechanical seal device for a rotating shaft according to claim 1, characterized in that, The fixed block is a sleeve, which is fitted around the outer circumference of the moving ring. The moving ring portion is accommodated within the sleeve. The elastic element is a spring, and the diameter of the spring is adapted to the inner diameter of the sleeve.

7. The mechanical seal device for a rotating shaft according to claim 6, characterized in that, The sleeve has a first spring groove on the side facing the moving ring, and the moving ring has a second spring groove on the side facing the sleeve. The two ends of the spring are respectively accommodated in the first spring groove and the second spring groove.

8. The mechanical seal device for a rotating shaft according to claim 1, characterized in that, A pressure gauge is fixed to the side of the moving ring facing the fixed block. The pressure gauge extends toward the fixed block and passes through the fixed block. The pressure gauge is marked with graduations.

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