Mechanical sealing structure for shaft
By setting up a compression spring in the mechanical sealing structure for shafts, the sealing problem caused by wear of the dynamic and static rings is solved, ensuring the sealing of the mechanical equipment and the service life of the compression spring.
Patent Information
- Application Number
- CN202422120365.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-30
AI Technical Summary
During the long-term use of existing mechanical sealing devices, gaps appear due to wear of the end face of the dynamic ring and the end face of the static ring, and it is impossible to ensure that the end face of the static ring and the end face of the static ring are always in place, resulting in poor sealing.
By providing a compression spring in the shaft mechanical sealing structure, the moving and static rings are ensured to always maintain fit. A compression spring is provided between the pressure gland and the static ring so that the static ring always moves in the axial direction close to the static ring, thereby maintaining the fitting state between the static ring and the static ring.
It effectively solves the gap problem caused by wear of the moving ring and the static ring, ensures the sealing of the mechanical equipment, extends the service life of the compression spring, and improves the connection tightness between the static ring and the static ring.
Smart Images
Figure CN222910768U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical seals, in particular to a mechanical seal structure for a shaft. Background Art
[0002] A mechanical seal refers to a device that prevents fluid leakage, in which at least one end face perpendicular to the axis of the rotating shaft remains in contact and relatively slides under the action of fluid pressure and the elastic force of a compensation mechanism, as well as with the cooperation of auxiliary seals. For example, in equipment such as centrifugal pumps, centrifuges, reactors, and compressors, since the rotating shaft penetrates inside and outside the aforementioned equipment, there will be a circumferential gap between the rotating shaft and the equipment. When the rotating shaft rotates relative to the equipment, the medium inside the equipment will leak out through this circumferential gap. If the pressure inside the equipment is lower than the atmospheric pressure, air will flow into the equipment, so there must be a sealing device to prevent leakage.
[0003] In existing sealing devices, most of them have a stationary ring connected to the equipment and a rotating ring connected to the rotating shaft, and the rotating ring can rotate relative to the stationary ring. Then, during long-term use, the end faces of the rotating ring and the stationary ring will wear and cause gaps. That is to say, existing mechanical seals cannot ensure that the end faces of the rotating ring and the stationary ring always remain in contact when the rotating shaft rotates. Summary of the Utility Model
[0004] (I) Technical Problems to be Solved
[0005] The technical problem to be solved by the utility model is to provide a mechanical seal structure for a shaft, which can make the rotating ring and the stationary ring always remain in contact through the arrangement of a compression spring, ensuring the sealing performance of mechanical equipment.
[0006] (II) Technical Solutions
[0007] The solution adopted by the utility model to solve the above technical problems is a mechanical seal structure for a shaft, including
[0008] A shaft sleeve, which is installed on the rotating shaft and can move synchronously with the rotating shaft;
[0009] A rotating ring, which is installed on the shaft sleeve and can move synchronously with the shaft sleeve;
[0010] A gland, which is installed on the shaft sleeve and fixedly installed on the mechanical equipment, so that the gland is stationary relative to the shaft sleeve;
[0011] A stationary ring, which is installed on the shaft sleeve and connected to the gland, so that the stationary ring is stationary relative to the shaft sleeve;
[0012] Among them, the gland, the moving ring and the static ring are arranged in sequence along the axial direction of the shaft sleeve, and the ends of the moving ring and the static ring close to each other are in contact; a compression spring is arranged between the gland and the static ring, and the compression spring gives the static ring a tendency to always move in the axial direction of the shaft sleeve towards the direction close to the moving ring, so that the moving ring and the static ring are always in contact.
[0013] In some embodiments, a shaft sleeve sealing ring is arranged inside the shaft sleeve to ensure the sealing between the shaft sleeve and the rotating shaft and prevent the medium from flowing in.
[0014] Adopting the above scheme, through the arrangement of the compression spring, the moving ring and the static ring can always be kept in contact, ensuring the sealing of the mechanical equipment.
[0015] In some embodiments, the gland includes a first gland shaft portion installed on the shaft sleeve. One end of the first gland shaft portion close to the static ring is recessed inward to form an installation groove, and a part of the compression spring is placed in the installation groove; and, one end of the compression spring extending out of the installation groove abuts against one end of the static ring close to the first gland shaft portion.
[0016] In some embodiments, the compression springs are arranged at equal intervals along the circumference of the static ring, so that the force on the static ring in the axial direction is uniform, thereby improving the smoothness of the contact between the static ring and the moving ring and preventing deviation.
[0017] Adopting the above scheme, the setting of the installation groove ensures the stability of the compression spring.
[0018] In some embodiments, a plurality of static ring anti-rotation pins are connected between the first gland shaft portion and the static ring to limit the rotation between the static ring and the gland; the plurality of static ring anti-rotation pins are arranged at equal intervals along the circumference of the static ring;
[0019] The cross-section of the static ring anti-rotation pin is T-shaped. The static ring anti-rotation pin includes a first static ring fitting portion and a second static ring fitting portion, and the first static ring fitting portion is the part with a larger size; and, one end of the static ring close to the first gland shaft portion is recessed inward to form a first static ring limiting groove; one end of the first gland shaft portion close to the static ring is recessed inward to form a second static ring limiting groove. The first static ring limiting groove and the second static ring limiting groove are arranged oppositely. The first static ring fitting portion is fitted in the first static ring limiting groove, and the second static ring fitting portion is fitted in the second static ring limiting groove; improving the reliability of use of the static ring anti-rotation pin.
[0020] In some embodiments, the stationary ring includes a first stationary ring portion and a second stationary ring portion arranged in sequence along the axial direction of the shaft sleeve. The first stationary ring portion is connected to the first gland shaft portion, the second stationary ring portion abuts against the moving ring, and the size of the second stationary ring portion in the radial direction is greater than that of the first stationary ring portion in the radial direction; the gland includes a first gland shaft portion, a second gland shaft portion, and a third gland shaft portion arranged along the axial direction; the second gland shaft portion is sleeved on the first stationary ring portion, and the second gland shaft portion is sleeved on the second stationary ring portion; moreover, one end of the second gland shaft portion close to the first stationary ring portion is recessed inward to form a first gland annular groove, and a stationary ring sealing ring is installed in the first gland annular groove.
[0021] With the above solution, the setting of the stationary ring sealing ring can prevent the medium of the mechanical equipment from entering the gland and the stationary ring, ensure the use environment of the compression spring, and extend the service life of the compression spring; the second gland shaft portion is sleeved on the first stationary ring portion, which can limit the radial movement of the stationary ring to ensure the stability of the stationary ring and further improve the connection tightness between the stationary ring and the moving ring.
[0022] In some embodiments, a part of the third gland shaft portion is sleeved on the moving ring; moreover, one end of the third gland shaft portion away from the first gland shaft portion forms an installation end surface for installing with the mechanical equipment; the installation end surface is recessed inward to form a second gland annular groove, and a gland sealing ring is installed in the second gland annular groove.
[0023] With the above solution, the sealing performance between the gland and the mechanical equipment is improved, and medium leakage is prevented.
[0024] In some embodiments, one end of the shaft sleeve close to the moving ring along the axial direction extends radially outward to form a first wall, and the first wall extends along the axial direction towards the other end of the shaft sleeve to form a second wall; there is a space between the second wall and the outer wall of the shaft sleeve and a moving ring receiving cavity for receiving the moving ring is formed; a part of the moving ring is received in the moving ring receiving cavity.
[0025] With the above solution, the installation stability between the moving ring and the shaft sleeve is improved. At the same time, the radial movement of the moving ring can also be restricted to ensure the stability of the moving ring and further improve the connection tightness between the stationary ring and the moving ring.
[0026] In some embodiments, the moving ring includes a first moving ring portion adapted to be received in the moving ring receiving cavity. A plurality of moving ring anti-rotation pins are connected between the first moving ring portion and the first wall to limit the rotation between the moving ring and the shaft sleeve; the plurality of moving ring anti-rotation pins are arranged at equal intervals along the circumferential direction of the moving ring;
[0027] The cross-section of the moving ring anti-rotation pin is T-shaped. The moving ring anti-rotation pin includes a first moving ring mating part and a second moving ring mating part, and the first moving ring mating part is the part with a larger size. Moreover, one end of the moving ring close to the first wall is recessed inward to form a first moving ring limiting groove. One end of the first wall close to the moving ring is recessed inward to form a second moving ring limiting groove. The first moving ring limiting groove and the second moving ring limiting groove are arranged oppositely. The first moving ring mating part is adapted to be within the first moving ring limiting groove, and the second moving ring mating part is adapted to be within the second moving ring limiting groove, which improves the reliability of use of the moving ring anti-rotation pin.
[0028] In some embodiments, the moving ring includes a first moving ring part, a second moving ring part, and a third moving ring part arranged in sequence along the axial direction. The radial dimensions of the first moving ring part, the second moving ring part, and the third moving ring part gradually increase. The third moving ring part abuts against the static ring, and its radial dimension is larger than that of the static ring in the radial direction. The second moving ring part is partially adapted to be within the moving ring receiving cavity. One end of the second wall at the opening end of the moving ring receiving cavity is recessed inward to form an annular recess. An annular receiving cavity is formed by the cooperation between the annular recess, the first moving ring part, and the second moving ring part. A moving ring seal ring is installed within the annular receiving cavity.
[0029] With the above scheme, the setting of the moving ring seal ring can prevent the medium of the mechanical equipment from entering between the moving ring and the shaft sleeve, and has good sealing performance.
[0030] In some embodiments, a driving ring is installed at one end of the shaft sleeve away from the static ring and away from the gland. A gap is formed by the spaced arrangement of the driving ring and the gland. Moreover, a plurality of first mounting holes are arranged at intervals along the circumferential direction of the driving ring. A plurality of second mounting holes are provided directly below the plurality of first mounting holes on the shaft sleeve. Screws are installed within the first mounting holes and the second mounting holes. Some of the screws can extend out of the second mounting holes to lock the driving ring and the shaft sleeve onto the rotating shaft. The remaining screws do not extend out of the second mounting holes to lock the driving ring and the shaft sleeve together.
[0031] Specifically, an annular groove is provided at the gland near the gap. A plurality of positioning blocks are detachably connected to the driving ring. The plurality of positioning blocks are arranged at intervals along the circumferential direction of the driving ring, and the positioning blocks are locked to the driving ring by screws. Both ends of the positioning block are clamped between the outer wall of the driving ring and the annular groove of the gland. There is also a positioning portion between the two ends of the positioning block. The positioning portion is clamped within the gap, and the size of the gap is limited by the thickness of the positioning portion. Furthermore, the distance between the gland and the static ring can be adjusted, so as to ensure the compression amount of the compression spring, and thus ensure its elastic compensation for the static ring.
[0032] With the above solution, since only part of the screw is locked with the rotating shaft, the setting of the driving ring increases the torque of the screw, thereby increasing the locking force between the shaft sleeve and the rotating shaft; moreover, the setting of the driving ring can also prevent the shaft sleeve from having radial displacement, ensuring stability.
[0033] In some embodiments, the moving ring and the static ring are made of any one of silicon carbide, ceramic, graphite, 304 stainless steel, 316 stainless steel, duplex stainless steel, titanium alloy, and Hastelloy.
[0034] (III) Beneficial effects
[0035] Compared with the prior art, the present utility model designs a shaft mechanical seal structure.
[0036] (1) Through the setting of the compression spring, the present utility model can make the moving ring and the static ring always keep in contact, ensuring the sealing performance of the mechanical equipment.
[0037] (2) By setting the installation groove on the gland, the present utility model ensures the stability of the compression spring.
[0038] (3) Through the setting of the static ring sealing ring, the present utility model can prevent the medium of the mechanical equipment from entering the gland and the static ring, ensuring the use environment of the compression spring and prolonging the service life of the compression spring; the second gland shaft part is sleeved on the first static ring part, which can limit the radial displacement of the static ring to ensure the stability of the static ring and further improve the connection tightness between the static ring and the moving ring.
[0039] (4) By designing that part of the moving ring is received in the moving ring receiving cavity, the present utility model improves the installation stability between the moving ring and the shaft sleeve. At the same time, it can also limit the radial displacement of the moving ring to ensure the stability of the moving ring and further improve the connection tightness between the static ring and the moving ring.
[0040] (5) Through the setting of the moving ring sealing ring, the present utility model can prevent the medium of the mechanical equipment from entering the moving ring and the shaft sleeve, with good sealing performance.
[0041] (6) The present utility model limits the size of the gap by the thickness of the positioning part; furthermore, the distance between the gland and the static ring can be adjusted, so as to ensure the compression amount of the compression spring and ensure its elastic compensation for the static ring. Description of the drawings
[0042] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.
[0043] Figure 1 It is a first-angle cross-sectional view of a shaft mechanical seal structure of the present utility model;
[0044] Figure 2 It is Figure 1 an enlarged schematic view of part A in
[0045] Figure 3 It is a second-angle cross-sectional view of a shaft mechanical seal structure of the present utility model;
[0046] Figure 4 It is Figure 3 an enlarged schematic view of part B in
[0047] Figure 5 It is Figure 3 an enlarged schematic view of part C in
[0048] Figure 6 It is Figure 3 an enlarged schematic view of part D in
[0049] Figure 7 It is a structural schematic view of a shaft mechanical seal structure of the present utility model;
[0050] Figure 8 It is Figure 7 an enlarged schematic view of part E in
[0051] The component names corresponding to the respective reference numerals in the figures are: 100, bushing; 101, first wall; 1011, second moving ring limiting groove; 102, second wall; 1021, annular recess; 103, moving ring receiving cavity; 104, annular receiving cavity; 105, second mounting hole; 106, bushing seal ring; 200, moving ring; 201, first moving ring part; 2011, first moving ring limiting groove; 202, second moving ring part; 203, third moving ring part; 204, moving ring seal ring; 300, gland; 301, first gland shaft part; 3011, mounting groove; 3012, second stationary ring limiting groove; 302, second gland shaft part; 3021, first gland annular groove; 303, third gland shaft part; 3031, mounting end face; 3031a, second gland annular groove; 304, gland seal ring; 305, annular groove; 400, stationary ring; 401, first stationary ring limiting groove; 402, first stationary ring part; 403, second stationary ring part; 404, stationary ring seal ring; 500, compression spring; 600, stationary ring anti-rotation pin; 601, first stationary ring mating part; 602, second stationary ring mating part; 700, moving ring anti-rotation pin; 701, first moving ring mating part; 702, second moving ring mating part; 800, drive ring; 801, first mounting hole; 900, gap; 100a, screw; 100b, positioning block; 100b1, positioning part. Detailed implementation manners
[0052] The following will, with reference to the accompanying drawings and embodiments, further describe in detail the specific implementation manners of the present utility model. The following embodiments are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.
[0053] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0054] The following describes the implementation manners of the present application through specific specific examples. Those skilled in the art can easily understand the other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope protected by the present application.
[0055] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present application, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects described herein can be used to implement the device and / or practice the method. Additionally, this device and / or this method can be implemented using other structures and / or functions in addition to one or more of the aspects described herein.
[0056] It should also be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application schematically. The components shown in the drawings only show the components related to the present application and are not drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in its actual implementation can be arbitrarily changed, and the component layout type may also be more complex.
[0057] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the examples can be practiced without these specific details.
[0058] The following describes the technical solutions provided by each embodiment of the present application in conjunction with the accompanying drawings.
[0059] As Figures 1 - 8As shown in the figure, an embodiment of the present utility model provides a shaft mechanical seal structure, including a shaft sleeve 100, which is installed on the rotating shaft and can move synchronously with the rotating shaft; a dynamic ring 200, which is installed on the shaft sleeve 100 and can move synchronously with the shaft sleeve 100; a gland 300, which is installed on the shaft sleeve 100 and fixedly installed on the mechanical equipment, so that the gland 300 is stationary relative to the shaft sleeve 100; a static ring 400, which is installed on the shaft sleeve 100 and connected to the gland 300, so that the static ring 400 is stationary relative to the shaft sleeve 100; wherein, the gland 300, the dynamic ring 200 and the static ring 400 are arranged in sequence along the axial direction of the shaft sleeve 100, and the ends of the dynamic ring 200 and the static ring 400 close to each other are in contact; twelve compression springs 500 are arranged between the gland 300 and the static ring 400, and the compression springs 500 give the static ring 400 a tendency to always move in the axial direction of the shaft sleeve 100 towards the direction close to the dynamic ring 200, so that the dynamic ring 200 and the static ring 400 are always in contact. The twelve compression springs 500 are arranged at equal intervals along the circumferential direction of the static ring 400. In some embodiments, a shaft sleeve seal ring 106 is arranged inside the shaft sleeve 100 to ensure the sealing performance between the shaft sleeve 100 and the rotating shaft and prevent the medium from flowing in. With the above scheme, through the arrangement of the compression springs 500, the dynamic ring 200 and the static ring 400 can always be in contact, ensuring the sealing performance of the mechanical equipment. In some embodiments, the gland 300 includes a first gland shaft portion 301 installed on the shaft sleeve 100, and an installation groove 3011 is formed by inward depression at one end of the first gland shaft portion 301 close to the static ring 400, and a part of the compression spring 500 is placed in the installation groove 3011; and, one end of the compression spring 500 extending out of the installation groove 3011 is in contact with one end of the static ring 400 close to the first gland shaft portion 301. In some embodiments, the compression springs 500 are arranged at equal intervals along the circumferential direction of the static ring 400, so that the force on the static ring 400 in the axial direction is uniform, thereby improving the smoothness of the contact between the static ring 400 and the dynamic ring 200 and preventing deviation. With the above scheme, the arrangement of the installation groove 3011 ensures the stability of the compression spring 500.
[0060] In some embodiments, two stationary ring anti-rotation pins 600 are connected between the first gland shaft portion 301 and the stationary ring 400 to limit the rotation between the stationary ring 400 and the gland 300; the two stationary ring anti-rotation pins 600 are arranged at equal intervals along the circumferential direction of the stationary ring 400; the cross-section of the stationary ring anti-rotation pin 600 is T-shaped, and the stationary ring anti-rotation pin 600 includes a first stationary ring mating portion 601 and a second stationary ring mating portion 602, and the first stationary ring mating portion 601 is the part with a larger size; and, one end of the stationary ring 400 close to the first gland shaft portion 301 is recessed inward to form a first stationary ring limiting groove 401; one end of the first gland shaft portion 301 close to the stationary ring 400 is recessed inward to form a second stationary ring limiting groove 3012, the first stationary ring limiting groove 401 and the second stationary ring limiting groove 3012 are arranged opposite to each other, the first stationary ring mating portion 601 is fitted in the first stationary ring limiting groove 401, and the second stationary ring mating portion 602 is fitted in the second stationary ring limiting groove 3012; the use reliability of the stationary ring anti-rotation pin 600 is improved. In some embodiments, the stationary ring 400 includes a first stationary ring portion 402 and a second stationary ring portion 403 arranged in sequence along the axial direction of the shaft sleeve 100, the first stationary ring portion 402 is connected to the first gland shaft portion 301, the second stationary ring portion 403 abuts against the moving ring 200, and the size of the second stationary ring portion 403 in the radial direction is larger than the size of the first stationary ring portion 402 in the radial direction; the gland 300 includes a first gland shaft portion 301, a second gland shaft portion 302 and a third gland shaft portion 303 arranged along the axial direction; the second gland shaft portion 302 is sleeved on the first stationary ring portion 402, and the second gland shaft portion 302 is sleeved on the second stationary ring portion 403; and, one end of the second gland shaft portion 302 close to the first stationary ring portion 402 is recessed inward to form a first gland annular groove 3021, and a stationary ring sealing ring 404 is installed in the first gland annular groove 3021. With the above scheme, the setting of the stationary ring sealing ring 404 can prevent the medium of the mechanical equipment from entering the gland 300 and the stationary ring 400, ensure the use environment of the compression spring 500, and extend the service life of the compression spring 500; the second gland shaft portion 302 is sleeved on the first stationary ring portion 402, which can limit the radial movement of the stationary ring 400 to ensure the stability of the stationary ring 400 and further improve the connection tightness between the stationary ring 400 and the moving ring 200. In some embodiments, a part of the third gland shaft portion 303 is sleeved on the moving ring 200; and, one end of the third gland shaft portion 303 away from the first gland shaft portion 301 forms an installation end face 3031 for installing with the mechanical equipment; the installation end face 3031 is recessed inward to form a second gland annular groove 3031a, and a gland sealing ring 304 is installed in the second gland annular groove 3031a.With the above solution, the sealing performance between the gland 300 and the mechanical equipment is improved, preventing medium leakage.
[0061] In some embodiments, one end of the bushing 100 close to the moving ring 200 along the axial direction extends radially outward to form a first wall 101, and the first wall 101 extends along the axial direction towards the other end of the bushing 100 to form a second wall 102; a space is arranged between the second wall 102 and the outer wall of the bushing 100 to form a moving ring receiving cavity 103 for receiving the moving ring 200; a part of the moving ring 200 is received in the moving ring receiving cavity 103. With the above scheme, the installation stability between the moving ring 200 and the bushing 100 is improved. At the same time, the radial movement of the moving ring 200 can also be restricted to ensure the stability of the moving ring 200, and further improve the connection tightness between the stationary ring 400 and the moving ring 200. In some embodiments, the moving ring 200 includes a first moving ring part 201 adapted in the moving ring receiving cavity 103, and two moving ring anti-rotation pins 700 are connected between the first moving ring part 201 and the first wall 101 to restrict the rotation between the moving ring 200 and the bushing 100; the two moving ring anti-rotation pins 700 are arranged at equal intervals along the circumferential direction of the moving ring 200; the cross-section of the moving ring anti-rotation pin 700 is T-shaped, and the moving ring anti-rotation pin 700 includes a first moving ring mating part 701 and a second moving ring mating part 702, and the first moving ring mating part 701 is the part with a larger size; moreover, one end of the moving ring 200 close to the first wall 101 is recessed inward to form a first moving ring limiting groove 2011; one end of the first wall 101 close to the moving ring 200 is recessed inward to form a second moving ring limiting groove 1011, the first moving ring limiting groove 2011 and the second moving ring limiting groove 1011 are arranged oppositely, the first moving ring mating part 701 is adapted in the first moving ring limiting groove 2011, and the second moving ring mating part 702 is adapted in the second moving ring limiting groove 1011; the use reliability of the moving ring anti-rotation pin 700 is improved. In some embodiments, the moving ring 200 includes a first moving ring part 201, a second moving ring part 202 and a third moving ring part 203 arranged in sequence along the axial direction, and the radial dimensions of the first moving ring part 201, the second moving ring part 202 and the third moving ring part 203 gradually increase; the third moving ring part 203 abuts against the stationary ring 400, and the radial dimension is larger than the radial dimension of the stationary ring 400; a part of the second moving ring part 202 is adapted in the moving ring receiving cavity 103, and a part of the second wall 102 at the opening end of the moving ring receiving cavity 103 is recessed inward to form an annular recess 1021, and an annular receiving cavity 104 is formed by the cooperation between the annular recess 1021, the first moving ring part 201 and the second moving ring part 202, and a moving ring seal ring 204 is installed in the annular receiving cavity 104. With the above scheme, the setting of the moving ring seal ring 204 can prevent the medium of the mechanical equipment from entering the moving ring 200 and the bushing 100, and the sealing performance is good.
[0062] In some embodiments, a driving ring 800 is installed at one end of the bushing 100 away from the stationary ring 400 and towards the gland 300; a gap 900 is formed between the driving ring 800 and the gland 300 and is arranged at intervals; and, ten first mounting holes 801 are arranged at intervals along the circumference of the driving ring 800, and ten second mounting holes 105 are provided directly below the multiple first mounting holes 801 on the bushing 100; screws 100a are installed in the first mounting holes 801 and the second mounting holes 105, and six of the screws 100a can extend out of the second mounting holes 105 to lock the driving ring 800 and the bushing 100 to the rotating shaft; four of the screws 100a do not extend out of the second mounting holes 105 to lock the driving ring 800 and the bushing 100 together. Specifically, an annular groove 305 is provided at the gland 300 near the gap 900, and four positioning blocks 100b are detachably connected to the driving ring 800. The four positioning blocks 100b are arranged at intervals along the circumference of the driving ring 800, and the positioning blocks 100b are locked to the driving ring 800 by screws 100a; both ends of the positioning blocks 100b are clamped between the outer wall of the driving ring 800 and the annular groove 305 of the gland 300; a positioning portion 100b1 is further provided between the two ends of the positioning blocks 100b, and the positioning portion 100b1 is clamped in the gap 900, and the size of the gap 900 is limited by the thickness of the positioning portion 100b1; furthermore, the distance between the gland 300 and the stationary ring 400 can be adjusted, so as to ensure the compression amount of the compression spring 500, so as to ensure its elastic compensation for the stationary ring 400. With the above solution, since only part of the screw 100a is locked to the rotating shaft, the setting of the driving ring 800 increases the torque of the screw 100a, and further increases the locking force between the bushing 100 and the rotating shaft; and, the setting of the driving ring 800 can also prevent the bushing 100 from moving radially, ensuring stability.
[0063] For the same and similar parts among the various embodiments in this specification, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.
[0064] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A mechanical seal structure for a shaft, characterized in that: include A shaft sleeve (100) is mounted on the rotating shaft and is capable of moving synchronously with the rotating shaft; A moving ring (200) is mounted on the shaft sleeve (100) and is capable of performing synchronous movement with the shaft sleeve (100); A gland (300) is mounted on the shaft sleeve (100) and fixedly mounted on a mechanical device so that the gland (300) is stationary relative to the shaft sleeve (100); a stationary ring (400) mounted on the shaft sleeve (100) and connected to the gland (300) so that the stationary ring (400) is stationary relative to the shaft sleeve (100); The pressure cover (300), the dynamic ring (200) and the static ring (400) are arranged in sequence along the axial direction of the sleeve (100), and the ends of the dynamic ring (200) and the static ring (400) that are close to each other abut against each other; a compression spring (500) is arranged between the pressure cover (300) and the static ring (400), and the compression spring (500) gives the static ring (400) a tendency to always move in the direction close to the dynamic ring (200) in the axial direction of the sleeve (100), so that the dynamic ring (200) and the static ring (400) are always in close contact.
2. The shaft mechanical seal structure according to claim 1, characterized in that: The pressure cover (300) includes a first pressure cover shaft portion (301) installed on the sleeve (100), and one end of the first pressure cover shaft portion (301) close to the stationary ring (400) is recessed inward to form a mounting groove (3011), and the compression spring (500) is partially placed in the mounting groove (3011); and one end of the compression spring (500) extending out of the mounting groove (3011) abuts against one end of the stationary ring (400) close to the first pressure cover shaft portion (301).
3. The shaft mechanical seal structure according to claim 2, characterized in that: A plurality of stationary ring anti-rotation pins (600) are connected between the first gland shaft portion (301) and the stationary ring (400) to limit the rotation between the stationary ring (400) and the gland (300); the plurality of stationary ring anti-rotation pins (600) are arranged at equal intervals along the circumference of the stationary ring (400); The cross-section of the stationary ring anti-rotation pin (600) is T-shaped. The stationary ring anti-rotation pin (600) includes a first stationary ring matching portion (601) and a second stationary ring matching portion (602), and the first stationary ring matching portion (601) is a larger portion; and one end of the stationary ring (400) close to the first pressure cover shaft portion (301) is recessed inward to form a first stationary ring limiting groove (401); one end of the first pressure cover shaft portion (301) close to the stationary ring (400) is recessed inward to form a second stationary ring limiting groove (3012), the first stationary ring limiting groove (401) and the second stationary ring limiting groove (3012) are arranged opposite to each other, the first stationary ring matching portion (601) is adapted in the first stationary ring limiting groove (401), and the second stationary ring matching portion (602) is adapted in the second stationary ring limiting groove (3012).
4. The shaft mechanical seal structure according to claim 2, characterized in that: The stationary ring (400) comprises a first stationary ring portion (402) and a second stationary ring portion (403) which are sequentially arranged along the axial direction of the shaft sleeve (100); the first stationary ring portion (402) is connected to the first gland shaft portion (301); the second stationary ring portion (403) is abutted against the moving ring (200); the radial dimension of the second stationary ring portion (403) is greater than the radial dimension of the first stationary ring portion (402); the gland (300) comprises a first gland shaft portion (301) which is sequentially arranged along the axial direction of the shaft sleeve (100); 01), a second gland shaft portion (302) and a third gland shaft portion (303); the second gland shaft portion (302) is sleeved on the first stationary ring portion (402), and the second gland shaft portion (302) is sleeved on the second stationary ring portion (403); and, one end of the second gland shaft portion (302) close to the first stationary ring portion (402) is recessed inward to form a first gland annular groove (3021), and a stationary ring sealing ring (404) is installed in the first gland annular groove (3021).
5. The shaft mechanical seal structure according to claim 4, characterized in that: The third gland shaft portion (303) is partially sleeved on the dynamic ring (200); and, an end of the third gland shaft portion (303) away from the first gland shaft portion (301) is formed with a mounting end surface (3031) for mounting with mechanical equipment; the mounting end surface (3031) is recessed inward to form a second gland annular groove (3031a), and a gland sealing ring (304) is installed in the second gland annular groove (3031a).
6. The shaft mechanical seal structure according to claim 1, characterized in that: The end of the sleeve (100) axially close to the movable ring (200) extends radially outward to form a first wall (101), and the first wall (101) extends axially toward the other end of the sleeve (100) to form a second wall (102); the second wall (102) and the outer wall of the sleeve (100) are arranged at intervals to form a movable ring receiving cavity (103) for receiving the movable ring (200); the movable ring (200) is partially received in the movable ring receiving cavity (103).
7. The shaft mechanical seal structure according to claim 6, characterized in that: The movable ring (200) comprises a first movable ring portion (201) adapted to be inside the movable ring receiving cavity (103); a plurality of movable ring anti-rotation pins (700) are connected between the first movable ring portion (201) and the first wall (101) to limit the rotation between the movable ring (200) and the shaft sleeve (100); the plurality of movable ring anti-rotation pins (700) are arranged at equal intervals along the circumference of the movable ring (200); The cross-section of the movable ring anti-rotation pin (700) is T-shaped. The movable ring anti-rotation pin (700) comprises a first movable ring matching portion (701) and a second movable ring matching portion (702), and the first movable ring matching portion (701) is a larger portion; and one end of the movable ring (200) close to the first wall (101) is recessed inward to form a first movable ring limiting groove (2011); one end of the first wall (101) close to the movable ring (200) is recessed inward to form a second movable ring limiting groove (1011), the first movable ring limiting groove (2011) and the second movable ring limiting groove (1011) are arranged opposite to each other, the first movable ring matching portion (701) is adapted to be fitted in the first movable ring limiting groove (2011), and the second movable ring matching portion (702) is adapted to be fitted in the second movable ring limiting groove (1011).
8. The shaft mechanical seal structure according to claim 7, characterized in that: The movable ring (200) comprises a first movable ring portion (201), a second movable ring portion (202) and a third movable ring portion (203) which are arranged in sequence along the axial direction, wherein the radial dimensions of the first movable ring portion (201), the second movable ring portion (202) and the third movable ring portion (203) gradually increase; the third movable ring portion (203) abuts against the stationary ring (400), and the radial dimension of the third movable ring portion (203) is greater than the radial dimension of the stationary ring (400); the second movable ring portion (201) and the second movable ring portion (202) are arranged in sequence along the axial direction, wherein the radial dimensions of the first movable ring portion (201), the second movable ring portion (202) and the third movable ring portion (203) gradually increase; the third movable ring portion (203) abuts against the stationary ring (400), and the radial dimension of the third movable ring portion (203) is greater than The ring portion (202) is partially adapted in the dynamic ring receiving cavity (103); the second wall (102) is located at the opening end of the dynamic ring receiving cavity (103) and is partially recessed inward to form an annular recess (1021); the annular recess (1021), the first dynamic ring portion (201) and the second dynamic ring portion (202) cooperate to form an annular receiving cavity (104); a dynamic ring sealing ring (204) is installed in the annular receiving cavity (104).
9. The shaft mechanical seal structure according to claim 1, characterized in that: The shaft sleeve (100) is provided with a drive ring (800) at one end of the pressure cover (300) away from the stationary ring (400); the drive ring (800) and the pressure cover (300) are arranged at intervals to form a gap (900); and the drive ring (800) is provided with a plurality of first mounting holes (801) arranged at intervals along the circumferential direction, and the shaft sleeve (100) is provided with a plurality of second mounting holes (105) directly below the plurality of first mounting holes (801); screws (100a) are installed in the first mounting holes (801) and the second mounting holes (105), wherein a portion of the screws (100a) can extend out of the second mounting holes (105) to lock the drive ring (800) and the shaft sleeve (100) on the rotating shaft; and the remaining screws (100a) do not extend out of the second mounting holes (105) to lock the drive ring (800) and the shaft sleeve (100) together.
10. The shaft mechanical seal structure according to claim 1, characterized in that: The dynamic ring (200) and the static ring (400) are made of any one of silicon carbide, ceramic, graphite, 304 stainless steel, 316 stainless steel, duplex stainless steel, titanium alloy, and Hastelloy alloy.