Mechanical sealing mechanism

Abstract

The utility model discloses a mechanical sealing mechanism. The mechanical sealing mechanism comprises a shaft body, a shell arranged on the shaft body in a sleeving mode and a sealing assembly. The sealing assembly comprises a first mounting sleeve, a second mounting sleeve, a static ring, an elastic piece, a movable ring and an adjusting piece; the first mounting sleeve and the second mounting sleeve are sequentially arranged on the shaft body in a sleeving mode in the radial direction of the shaft body and jointly define a mounting groove, the static ring is mounted on the adjusting part, the static ring, the movable ring and the elastic parts are arranged in the mounting groove and sequentially abut against the shaft body in the axial direction of the shaft body, and the multiple elastic parts are arranged in the circumferential direction of the shaft body at intervals; the elastic piece is clamped between the movable ring and the inner wall of the mounting groove, and the adjusting piece is in threaded connection with the inner wall of the mounting groove; the shaft body is provided with a first channel, the second mounting sleeve is provided with a second channel, the first mounting sleeve is provided with a third channel, and the shell is provided with a fourth channel; the first channel, the second channel, the mounting groove, the third channel and the fourth channel are sequentially communicated. The mechanical sealing mechanism can adapt to variable medium pressure.

Description

Technical Field

[0001] This utility model relates to the technical field of mechanical sealing equipment, and in particular to a mechanical sealing mechanism. Background Technology

[0002] Mechanical seals, as an important component of rotary motion equipment, are widely used in the rotating joints of rotary tables, robotic arms, robots, rotary processing equipment, and other similar devices. They also function as electrical components, responsible for connecting and transmitting signals and current to rotating objects. Therefore, the primary function of mechanical seals is to ensure uninterrupted supply of air pressure, liquid circulation, vacuum, power, and signals during continuous 360-degree rotation of the equipment.

[0003] Existing mechanical seal mechanisms mostly use sealing rings or oil seals for slip rings, which suffer from heat generation, severe wear, and insufficient lifespan during rotational motion. Furthermore, current mechanical seal mechanisms are mostly shaft-end mechanical seals, designed to prevent leakage of the medium within rotating equipment. These types of mechanical seal mechanisms use an elastic element to compensate for the wear of the rotating and stationary rings and to balance the opening forces of the stationary and rotating rings. This elastic element is often a spring, bellows, or wave spring. Since different media pressures result in varying opening forces, significant changes in the inlet pressure of the medium will lead to large variations in the opening force. Existing elastic elements cannot adapt to different and variable media pressures, thus preventing the mechanical seal mechanism from adapting to large-scale changes in the inlet pressure of the medium. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a mechanical sealing mechanism that can adapt to varying medium pressures by adjusting the compression of the elastic element.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A mechanical seal mechanism, comprising:

[0007] Shaft body;

[0008] A housing is fitted onto the shaft; a receiving groove is formed between the housing and the shaft;

[0009] The sealing assembly includes a first mounting sleeve, a second mounting sleeve, a stationary ring, an elastic element, a rotating ring, and an adjusting element;

[0010] Both the first mounting sleeve and the second mounting sleeve are disposed within the receiving groove. The first mounting sleeve and the second mounting sleeve are sequentially fitted onto the shaft along the radial direction of the shaft. The first mounting sleeve and the second mounting sleeve together enclose and form a mounting groove. The stationary ring is mounted on the adjusting member. The stationary ring, the moving ring, and the elastic member are all disposed within the mounting groove and sequentially abut against each other along the axial direction of the shaft. There are multiple elastic members, which are spaced apart along the circumferential direction of the shaft. Each elastic member is clamped between the moving ring and the inner wall of the mounting groove. The adjusting member is threadedly connected to the inner wall of the mounting groove to adjust the compression amount of each elastic member.

[0011] The shaft body is provided with a first channel, the second mounting sleeve is provided with a second channel, the first mounting sleeve is provided with a third channel, and the outer shell is provided with a fourth channel; the first channel, the second channel, the mounting groove, the third channel, and the fourth channel are connected in sequence.

[0012] Optionally, the sealing assembly further includes a sealing ring installed in the mounting groove; the sealing ring has a first ring portion and a second ring portion, the first ring portion extending circumferentially along the shaft and abutting against the second mounting sleeve, and the second ring portion being held between the moving ring and the elastic member.

[0013] Optionally, the sealing assembly further includes an elastic ring installed in the mounting groove; the first ring portion, the elastic ring, and the elastic element are arranged sequentially along the radial direction of the shaft and away from the shaft, and the elastic ring is arranged around the first ring portion of the sealing ring and applies elastic force so that the first ring portion abuts against the second mounting sleeve in a direction close to the shaft.

[0014] Optionally, a limiting platform is formed on the second mounting sleeve within the mounting groove. The limiting platform extends in a direction away from the shaft and divides the mounting groove into a first space and a second space. The stationary ring, the elastic element, the moving ring, the adjusting element, the sealing ring, and the elastic ring are installed in both the first space and the second space. The stationary ring, the elastic element, the moving ring, the adjusting element, the sealing ring, and the elastic ring in the first space and the stationary ring, the elastic element, the moving ring, the adjusting element, the sealing ring, and the elastic ring in the second space are symmetrically distributed around the limiting platform. The elastic element is clamped between the second ring portion of the limiting platform and the sealing ring. The second channel is located on the limiting platform, and both the first space and the second space are connected to the second channel.

[0015] Optionally, the limiting platform is provided with a first slot and a second slot, the first slot and the second slot are arranged radially at intervals along the shaft, one end of the elastic member is engaged in the first slot, and the first ring portion of the sealing ring is engaged in the second slot.

[0016] Optionally, the first mounting collar is provided with a fine-tooth internal thread, and the upper ring of the adjusting member is provided with a fine-tooth external thread. The adjusting member is threadedly connected to the first mounting collar through the cooperation of the fine-tooth external thread and the fine-tooth internal thread.

[0017] Optionally, the rotating ring has a sealing surface that abuts against the stationary ring, and the sealing surface is provided with a Rayleigh step.

[0018] Optionally, the mechanical seal mechanism further includes a first sealing ring and a second sealing ring; the first sealing ring is clamped between the housing and the first mounting sleeve of the sealing assembly, and the second sealing ring is clamped between the shaft and the second mounting sleeve of the sealing assembly.

[0019] Optionally, the mechanical seal mechanism further includes a first bearing, a second bearing, a first baffle, a cover plate, a second baffle, and a rear cover; the first baffle, the outer casing, the cover plate, and the rear cover are arranged sequentially along the axial direction of the shaft.

[0020] The outer circumferential side of the shaft is provided with a first shoulder and a second shoulder. The inner wall of the receiving groove of the housing is provided with a limiting shoulder. The first baffle and the cover are both installed on the housing by threaded fasteners. The housing is rotatably connected to the shaft by the first bearing. The shaft is rotatably connected to the cover by the second bearing. At least a portion of the first bearing is located between the limiting shoulder and the first shoulder. At least a portion of the first bearing is located between the limiting shoulder and the first baffle. The sealing assembly is located between the limiting shoulder and the cover. The second baffle is installed on the end of the shaft by threaded fasteners. The rear cover is installed on the housing by threaded fasteners. At least a portion of the second bearing is located between the second baffle and the second shoulder. At least a portion of the second bearing is located between the cover and the rear cover.

[0021] Optionally, there are multiple sealing components arranged sequentially along the axial direction of the shaft. All the sealing components are clamped between the limiting shoulder and the cover plate. There are multiple first channels, and each of the multiple first channels corresponds one-to-one with the second channel on the second mounting sleeve of the multiple sealing components.

[0022] The beneficial effects of this utility model are as follows: This mechanical seal mechanism achieves medium sealing through a sealing assembly, and avoids problems such as heat generation and wear during shaft rotation by injecting medium into the sealing assembly. The adjusting component of the sealing assembly is rotatable and slidably installed. When the mechanical seal mechanism experiences different opening forces due to different injected media, the compression of each elastic element can be adjusted simultaneously by rotating the adjusting component. This allows the sealing assembly to both compensate for the wear and tear of the rotating and stationary rings using the elastic elements and balance the opening forces of the stationary and rotating rings, and also adapt to the opening forces of different media by adjusting the compression of the elastic elements. Attached Figure Description

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the mechanical seal mechanism;

[0025] Figure 2 A half-sectional view of the mechanical seal mechanism from one perspective;

[0026] Figure 3 A half-sectional view of the mechanical seal mechanism from another perspective;

[0027] Figure 4 This is a half-sectional view of the sealing assembly;

[0028] Figure 5 This is a partial half-sectional view of the sealing assembly;

[0029] Figure 6 A half-sectional view illustrating the installation of multiple sealing components;

[0030] Figure 7 This is a schematic diagram of the sealing assembly. The first mounting sleeve, a stationary ring, a rotating ring, and an adjusting component are omitted from the diagram.

[0031] Figure 8 This is the front view of the moving ring.

[0032] Explanation of reference numerals in the attached figures:

[0033] 11. Shaft body; 12. Housing; 13. Sealing assembly; 14. First sealing ring; 15. Second sealing ring; 16. First bearing; 17. Second bearing; 18. First baffle; 19. Cover plate; 20. Second baffle; 21. Rear cover;

[0034] 1101, First Passage;

[0035] 1201, Fourth Channel;

[0036] 1301. First mounting sleeve; 1302. Second mounting sleeve; 1303. Stationary ring; 1304. Elastic element; 1305. Moving ring; 1306. Adjusting element; 1307. Sealing ring; 1308. Elastic ring; 1309. First space; 1310. Second space; 1311. Second channel; 1312. Third channel; 1313. Second ring portion; 1314. First ring portion; 1315. Limiting platform; 1316. Sealing surface; 1317. Raleigh step; 1318. Mounting groove. Detailed Implementation

[0037] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "fixed," "linked," "communicated," "abutting," "clamping," 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description herein, it should be understood that the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationships shown in the accompanying drawings, and are used only for ease of description and simplification of operation. They 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are merely used for distinction in description and have no special meaning.

[0041] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0043] Unless otherwise stated or defined, the term "and / or" as used in this invention includes any and all combinations of one or more of the associated listed items.

[0044] like Figures 1 to 6 As shown, this embodiment provides a mechanical seal mechanism, including a shaft 11, a housing 12, and a sealing assembly 13. The housing 12 has a rotary structure and is provided with a sleeve groove, which is fitted onto the shaft 11. A receiving groove is formed between the housing 12 and the shaft 11, and a receiving groove is formed between the inner wall of the sleeve groove and the outer circumferential side surface of the shaft 11. The sealing assembly 13 has a rotary structure.

[0045] The sealing assembly 13 includes a first mounting sleeve 1301, a second mounting sleeve 1302, a stationary ring 1303, an elastic element 1304, a rotating ring 1305, and an adjusting element 1306. The first mounting sleeve 1301, the second mounting sleeve 1302, the stationary ring 1303, the elastic element 1304, the rotating ring 1305, and the adjusting element 1306 are all rotary structures and can be arranged around the shaft 11. The elastic element 1304 is a spring.

[0046] The first mounting sleeve 1301 and the second mounting sleeve 1302 are both disposed within the receiving groove. The first mounting sleeve 1301 and the second mounting sleeve 1302 are sequentially fitted onto the shaft 11 along the radial direction of the shaft 11. The first mounting sleeve 1301 and the second mounting sleeve 1302 together enclose the mounting groove 1318 to form the mounting groove 1318. The second mounting sleeve 1302 is first fitted onto the shaft 11 and abuts against the outer circumferential side of the shaft 11. The first mounting sleeve 1301 is fitted onto the second mounting sleeve 1302, thus forming a groove between the first mounting sleeve 1301 and the second mounting sleeve 1302. The adjusting member 1306 is provided with a fitting groove, and the stationary ring 1303 is installed in the fitting groove of the adjusting member 1306. The stationary ring 1303, the moving ring 1305, and the elastic member 1304 are all disposed within the mounting groove 1318 and abut against the shaft 11 sequentially along the axial direction. There are multiple elastic members 1304, which are spaced apart along the circumferential direction of the shaft 11. The elastic element 1304 can extend and retract along the axial direction of the shaft 11. The elastic element 1304 is used to compensate for the wear of the rotating ring 1305 and the stationary ring 1303 and to balance the opening force of the stationary ring 1303 and the rotating ring 1305. Each elastic element 1304 is clamped between the rotating ring 1305 and the inner wall of the mounting groove 1318. The inner wall of the mounting groove 1318 can be located on the first mounting sleeve 1301, or on the second mounting sleeve 1302, or partly on the first mounting sleeve 1301 and partly on the second mounting sleeve 1302. The adjusting member 1306 is threadedly connected to the inner wall of the mounting groove 1318 to adjust the compression of each elastic element 1304. Specifically, the first mounting sleeve 1301 and / or the second mounting sleeve 1302 are threadedly connected to the adjusting member 1306. When the adjusting member 1306 is rotated, it slides and pushes the elastic elements 1304, thereby simultaneously changing the compression of each elastic element 1304. The specific number of elastic elements 1304 needs to be calculated based on the stiffness of each elastic element 1304 and the opening force between the stationary ring 1303 and the moving ring 1305.

[0047] The shaft 11 has a first channel 1101, the second mounting sleeve 1302 has a second channel 1311, the first mounting sleeve 1301 has a third channel 1312, and the outer shell 12 has a fourth channel 1201. The first channel 1101, the second channel 1311, the mounting groove 1318, the third channel 1312, and the fourth channel 1201 are connected in sequence. One end of the first channel 1101 is on the end face of the shaft 11 and communicates with the outside of the shaft 11. The other end of the first channel 1101 extends first along the axial direction of the shaft 11 and then along the radial direction of the shaft 11. The second channel 1311 extends along the radial direction of the shaft 11 and communicates with the first channel 1101. The third channel 1312 extends along the radial direction of the shaft 11. The two ends of the third channel 1312 are respectively connected to the second channel 1311 and the fourth channel 1201. The fourth channel 1201 extends along the radial direction of the shaft 11. One end of the fourth channel 1201 is connected to the third channel 1312, and the other end of the fourth channel 1201 is connected to the outside of the outer casing 12. In this way, by injecting a medium into the first channel 1101 or the fourth channel 1201, the medium can circulate. The medium can prevent the shaft 11 from overheating and suffering from severe wear during rotation, which can lead to insufficient lifespan.

[0048] Because the opening force of a mechanical seal varies depending on the pressure of the medium injected, a large change in the inlet pressure of the medium will result in a large change in the opening force. The existing elastic element 1304 cannot adapt to different and variable medium pressures, especially when the inlet pressure of the medium changes over a wide range, the elastic element 1304 cannot balance the opening forces of the stationary ring 1303 and the rotating ring 1305. This application allows the compression of the elastic element 1304 to be adjusted by rotating the adjusting element 1306 according to the inlet pressure of the medium before injection, thereby enabling the sealing assembly 13 to adapt to varying medium pressures and improving the sealing performance of the mechanical seal mechanism.

[0049] Optional, see reference Figures 4 to 6The sealing assembly 13 also includes a sealing ring 1307 installed in the mounting groove 1318. The sealing ring 1307 has a first ring portion 1314 and a second ring portion 1313 connected together. Both the first ring portion 1314 and the second ring portion 1313 are L-shaped and encircle the shaft 11. The first ring portion 1314 extends circumferentially along the shaft 11 and abuts against the second mounting sleeve 1302, abutting against the outer circumferential side surface of the second mounting sleeve 1302. The second ring portion 1313 is held between the moving ring 1305 and the elastic member 1304. Traditional sealing components 13 use O-rings to achieve the sealing ring. In this application, the sealing ring 1307 is a non-circular sealing ring. The non-circular sealing ring replaces the O-ring at the elastic element 1304 that affects the axial movement of the rotating ring 1305 along the shaft 11. This makes the axial movement of the rotating ring 1305 along the shaft 11 smoother and eliminates the influence of the elastic force of the O-ring caused by compression on the elastic force of the elastic element 1304. It also eliminates the obstruction of the axial movement of the rotating ring 1305 by the O-ring and avoids the O-ring affecting the axial movement of the rotating ring 1305.

[0050] Furthermore, the sealing assembly 13 also includes an elastic ring 1308 installed within the mounting groove 1318. The first ring portion 1314, the elastic ring 1308, and the elastic element 1304 are arranged sequentially along the radial direction of the shaft 11 and away from the shaft 11. The elastic ring 1308 encircles the first ring portion 1314 of the sealing ring 1307 and applies elastic force to cause the first ring portion 1314 to abut against the outer circumferential side surface of the second mounting sleeve 1302 in a direction close to the shaft 11. The elastic ring 1308 is a circular wire spring coil, which can apply elastic force to the first ring portion 1314, causing the first ring portion 1314 to fit tightly against the outer circumferential side surface of the second mounting sleeve 1302 to achieve a better seal and prevent the medium from flowing out.

[0051] Optionally, a limiting platform 1315 is formed on the second mounting sleeve 1302 within the mounting groove 1318. The limiting platform 1315 extends in a direction away from the shaft 11 and divides the mounting groove 1318 into a first space 1309 and a second space 1310. The first space 1309 and the second space 1310 are arranged sequentially along the axial direction of the shaft 11 and are connected. A stationary ring 1303, an elastic element 1304, a moving ring 1305, an adjusting element 1306, a sealing ring 1307, and an elastic ring 1308 are installed in both the first space 1309 and the second space 1310. The stationary ring 1303, elastic element 1304, moving ring 1305, adjusting element 1306, sealing ring 1307, and elastic ring 1308 in the first space 1309 and the stationary ring 1303, elastic element 1304, moving ring 1305, adjusting element 1306, sealing ring 1307, and elastic ring 1308 in the second space 1310 are symmetrically distributed around the limiting platform 1315. The elastic element 1304 is clamped between the limiting platform 1315 and the second ring portion 1313 of the sealing ring 1307. The second channel 1311 is located on the limiting platform 1315, and both the first space 1309 and the second space 1310 are connected to the second channel 1311. In this embodiment, a second channel 1311 is provided in the middle of the limiting platform 1315, and the structure of the entire sealing assembly 13 is a completely mirror-symmetrical structure with the limiting platform 1315 as the center. The moving ring 1305 is bonded to the sealing ring 1307, one end of the elastic member 1304 is fixed to the limiting platform 1315, and the other end of the elastic member 1304 abuts against the sealing ring 1307. The elastic member 1304 is always in a compressed state, pressing against the sealing ring 1307 and the moving ring 1305, so that there is a certain pressure between the moving ring 1305 and the stationary ring 1303.

[0052] In one embodiment, the limiting platform 1315 is provided with a first slot and a second slot, which are arranged radially at intervals along the shaft 11. One end of the elastic element 1304 is engaged in the first slot, and the first ring portion 1314 of the sealing ring 1307 is engaged in the second slot. The first slot and the second slot are circular holes. One end of the elastic element 1304 is fixed in the circular hole of the limiting platform 1315, and a portion of the sealing ring 1307 is engaged in the second slot of the limiting platform 1315, thereby realizing the installation of the elastic element 1304 and the sealing ring 1307.

[0053] Optionally, the first mounting sleeve 1301 has a fine-tooth internal thread on its upper ring, and the adjusting member 1306 has a fine-tooth external thread on its upper ring. The adjusting member 1306 is threadedly connected to the first mounting sleeve 1301 through the cooperation of the fine-tooth external thread and the fine-tooth internal thread.

[0054] The outer ring of the adjusting component 1306 has fine external threads, and both ends of the first mounting sleeve 1301 are provided with fine internal threads. The adjusting component 1306 is installed at both ends of the first mounting sleeve 1301. The sealing performance at the connection between the adjusting component 1306 and the first mounting sleeve 1301 can be improved by the cooperation of the fine external threads and the fine internal threads.

[0055] refer to Figure 5 and Figure 8 Furthermore, the rotating ring 1305 has a sealing surface 1316 that abuts against the stationary ring 1303, and a Rayleigh step 1317 is provided on the sealing surface 1316. The Rayleigh step 1317 is also known as an inverted Rayleigh step. The Rayleigh step 1317 utilizes the step structure to guide the lubricating medium to form a high-pressure oil film, significantly reducing friction and wear and improving sealing performance. At the same time, by adjusting parameters such as the step height and length, the pressure distribution can be precisely controlled, enhancing system stability and lifespan, especially suitable for high-speed and high-load conditions. Therefore, designing the Rayleigh step 1317 on the rotating ring 1305 allows the rotating ring 1305 to form a non-contact seal at a certain rotational speed, reducing wear caused by direct contact between the rotating ring 1305 and the stationary ring 1303, and also reducing heat generation problems caused by wear.

[0056] In this application, the number of elastic elements 1304 can be matched according to the rigidity of the elastic elements 1304 and the opening force of the Raleigh step 1317 in actual use. By appropriately increasing or decreasing the number of elastic elements 1304, the thickness of the liquid film is ensured to be at the minimum leakage point while maintaining the opening force. Based on this, the compression of the elastic elements 1304 is adjusted by rotating the adjusting element 1306, thereby enabling the mechanical seal mechanism to better adapt to varying media pressures.

[0057] During operation, the mechanical seal mechanism of this application allows the medium to flow within it. The medium enters from the fourth channel 1201 into the third channel 1312, and then into the first space 1309 and the second space 1310 inside the entire sealing assembly 13. There are three leakage points within the first space 1309 and the second space 1310. The first is between the first mounting sleeve 1301 and the adjusting member 1306, where a fine-pitch thread and sealant are used for sealing. The second is the contact surface between the rotating ring 1305 and the stationary ring 1303, where a Rayleigh step 1317 is used to achieve a non-contact seal. The Rayleigh step 1317 generates a dynamic pressure effect during the rotation of the rotating ring 1305, which serves both as a seal and reduces wear. The third is the contact portion between the sealing ring 1307 and the limiting platform 1315 of the second mounting sleeve 1302, where an elastic ring 1308 is used to press the sealing ring 1307 together, thus achieving a sealing effect. The medium inside the entire sealing assembly 13 enters from the second channel 1311 on the second mounting sleeve 1302 into the annular groove on the outer circumferential side of the shaft 11, then enters the first channel 1101 of the shaft 11, and then enters the rotating device connected to the shaft 11.

[0058] In one embodiment, reference Figures 1 to 5 The mechanical seal mechanism also includes a first sealing ring 14 and a second sealing ring 15. The first sealing ring 14 is clamped between the outer shell 12 and the first mounting sleeve 1301 of the sealing assembly 13, and the second sealing ring 15 is clamped between the shaft 11 and the second mounting sleeve 1302 of the sealing assembly 13. The first sealing ring 14 and the second sealing ring 15 are O-rings. In existing mechanical seal mechanisms, the presence of the sealing rings causes significant obstruction to the pressure compensation of the stationary ring 1303 and the moving ring 1305 by the elastic element 1304, resulting in uneven axial movement of the stationary ring 1303. This application adjusts the compression of the elastic element 1304 to ensure that there is no relative displacement after using the O-rings, reducing the wear of the O-rings. The first sealing ring 14 seals the medium at the contact portion between the outer shell 12 and the sealing assembly 13, and the second sealing ring 15 seals the medium at the contact portion between the shaft 11 and the sealing assembly 13.

[0059] Optional, see reference Figures 1 to 3 The mechanical seal mechanism also includes a first bearing 16, a second bearing 17, a first baffle 18, a cover plate 19, a second baffle 20, and a rear cover 21. The first baffle 18, the outer shell 12, the cover plate 19, and the rear cover 21 are arranged sequentially along the axial direction of the shaft 11.

[0060] The outer circumferential side of the shaft 11 is provided with a first shoulder and a second shoulder, which are the places where the diameter of the shaft 11 changes. The inner wall of the receiving groove of the housing 12 is provided with a limiting shoulder, and the receiving groove of the housing 12 is a circular hole, with the limiting shoulder being the place where the inner diameter of the circular hole changes. The first baffle 18 and the cover plate 19 are both installed on the housing 12 by threaded fasteners. The housing 12 is rotatably connected to the shaft 11 by a first bearing 16, and the shaft 11 is rotatably connected to the cover plate 19 by a second bearing 17. At least a portion of the first bearing 16 is located between the limiting shoulder and the first shoulder, and at least a portion of the first bearing 16 is located between the limiting shoulder and the first baffle 18, thus realizing the installation of the first bearing 16. The sealing assembly 13 is located between the limiting hole shoulder and the cover plate 19. The second baffle 20 is installed on the end of the shaft 11 by threaded fasteners. The rear cover 21 is installed on the outer shell 12 by threaded fasteners. At least a portion of the second bearing 17 is located between the second baffle 20 and the second shaft shoulder. At least a portion of the second bearing 17 is located between the cover plate 19 and the rear cover 21, thereby realizing the installation of the second bearing 17.

[0061] The inner rings of the first bearing 16 and the second bearing 17 are both mounted on the shaft 11 with an interference fit. The outer ring of the first bearing 16 contacts the outer casing 12. The first baffle 18 fixes the first bearing 16 to the outer casing 12, restricting its axial displacement. The first baffle 18 is mounted on the outer casing 12 with screws. At least one sealing assembly 13 is provided, and multiple sealing assemblies 13 are sequentially mounted between the outer casing 12 and the shaft 11 along the axial direction of the shaft 11. A cover plate 19 is mounted on the outer casing 12 and presses the sealing assemblies 13 between the outer casing 12 and the shaft 11. A second baffle 20 is connected to the shaft 11 with screws and fixes the second bearing 17 to the shaft 11. A rear cover 21 is fixed to the cover plate 19 with screws and seals the entire shaft end of the shaft 11, preventing leakage of the medium inside the rotating equipment.

[0062] In one embodiment, reference Figure 2 , Figure 3 , Figure 6Multiple sealing assemblies 13 are arranged sequentially along the axial direction of the shaft 11. All sealing assemblies 13 are clamped between the limiting shoulder and the cover plate 19. Multiple first channels 1101 are provided, each corresponding to a second channel 1311 on the second mounting sleeve 1302 of the multiple sealing assemblies 13. Multiple second channels 1311 and multiple third channels 1312 are also provided. Multiple second channels 1311 are spaced apart circumferentially along the shaft 11, and multiple third channels 1312 are spaced apart circumferentially along the shaft 11. The number of sealing assemblies 13 corresponds to the number of first channels 1101, and the number of sealing assemblies 13 corresponds to the number of fourth channels 1201. Multiple sealing assemblies 13 form a modular integrated structure, facilitating assembly and disassembly. This application uses three sealing assemblies 13 as an example to form a three-channel media transport system. In practice, the number of sealing assemblies 13 can be increased or decreased to create multiple channels.

[0063] The mechanical seal mechanism of this application is installed on a rotating device. The components that rotate with the output end of the rotating device include a shaft 11, a first bearing 16, a second bearing 17, a second baffle 20, a second mounting sleeve 1302, an elastic ring 1308, an elastic element 1304, a sealing ring 1307, and a rotating ring 1305. The rotating ring 1305 has relative displacement to the stationary ring 1303 and serves as the main sealing surface 1316 of the mechanical seal. The mechanical seal mechanism can adjust the number of elastic elements 1304 according to different usage scenarios, and the compression of the elastic elements 1304 can also be adjusted via an adjusting element 1306 to match the changes in the opening force of the Rayleigh step 1317 caused by different medium pressures.

[0064] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A mechanical seal mechanism characterized by, The utility model relates to a kind of seal assembly, including: Shaft body (11); Shell (12), sleeve is set in the shaft body (11);The shell (12) is formed with the shaft body (11) between accommodating groove; Sealing assembly (13), including first mounting sleeve (1301), second mounting sleeve (1302), static ring (1303), elastic member (1304), moving ring (1305) and adjusting member (1306); The first mounting sleeve (1301) and the second mounting sleeve (1302) are both arranged in the accommodating groove, the first mounting sleeve (1301) and the second mounting sleeve (1302) are sequentially sleeved on the shaft body (11) along the radial direction of the shaft body (11), the first mounting sleeve (1301) and the second mounting sleeve (1302) jointly enclose and form mounting groove (1318), the static ring (1303) is installed on the adjusting member (1306), the static ring (1303), the moving ring (1305), the elastic member (1304) are all arranged in the mounting groove (1318) and sequentially abut along the axial direction of the shaft body (11), the elastic member (1304) has multiple and is spaced apart along the circumferential direction of the shaft body (11), each elastic member (1304) is clamped between the moving ring (1305) and the inner wall of the mounting groove (1318), the adjusting member (1306) is threadedly connected with the inner wall of the mounting groove (1318) to adjust the compression amount of each elastic member (1304); The shaft body (11) is provided with a first channel (1101), the second mounting sleeve (1302) is provided with a second channel (1311), the first mounting sleeve (1301) is provided with a third channel (1312), and the shell (12) is provided with a fourth channel (1201);The first channel (1101), the second channel (1311), the mounting groove (1318), the third channel (1312) and the fourth channel (1201) are sequentially communicated.

2. The mechanical seal mechanism of claim 1, wherein The sealing assembly (13) further includes a sealing ring (1307) installed in the mounting groove (1318);The sealing ring (1307) has a first ring portion (1314) and a second ring portion (1313), the first ring portion (1314) extends along the circumferential direction of the shaft body (11) and abuts against the second mounting sleeve (1302), and the second ring portion (1313) is clamped between the moving ring (1305) and the elastic member (1304).

3. The mechanical seal mechanism of claim 2, wherein The sealing assembly (13) further includes an elastic ring (1308) installed in the mounting groove (1318);The first ring portion (1314), the elastic ring (1308) and the elastic member (1304) are sequentially arranged along the radial direction of the shaft body (11) and in the direction away from the shaft body (11), and the elastic ring (1308) is annularly arranged on the first ring portion (1314) of the sealing ring (1307) and exerts elastic force to make the first ring portion (1314) abut against the second mounting sleeve (1302) in the direction close to the shaft body (11).

4. The mechanical seal mechanism of claim 3, wherein The second mounting sleeve (1302) is provided with a limiting table (1315) located in the mounting groove (1318), the limiting table (1315) extends away from the shaft body (11) and separates the mounting groove (1318) into a first space (1309) and a second space (1310), the static ring (1303), the elastic member (1304), the movable ring (1305), the adjusting member (1306), the sealing ring (1307) and the elastic ring (1308) are installed in the first space (1309) and the second space (1310), the static ring (1303), the elastic member (1304), the movable ring (1305), the adjusting member (1306), the sealing ring (1307) and the elastic ring (1308) in the first space (1309) and the second space (1310) are symmetrically distributed with the limiting table (1315) as the center, the elastic member (1304) is clamped between the limiting table (1315) and the second ring part (1313) of the sealing ring (1307), the second channel (1311) is located on the limiting table (1315), and the first space (1309) and the second space (1310) are in communication with the second channel (1311).

5. The mechanical seal mechanism of claim 4, wherein The limiting table (1315) is provided with a first clamping groove and a second clamping groove, the first clamping groove and the second clamping groove are arranged at intervals along the radial direction of the shaft body (11), one end of the elastic member (1304) is clamped in the first clamping groove, and the first ring part (1314) of the sealing ring (1307) is clamped in the second clamping groove.

6. The mechanical seal mechanism according to any one of claims 1 to 5, characterized by The first mounting sleeve (1301) is provided with a fine internal thread, the adjusting member (1306) is provided with a fine external thread, and the adjusting member (1306) is threadedly connected with the first mounting sleeve (1301) through cooperation of the fine external thread and the fine internal thread.

7. The mechanical seal mechanism according to any one of claims 1 to 5, characterized by The movable ring (1305) has a sealing surface (1316) abutting against the static ring (1303), and the sealing surface (1316) is provided with a Rayleigh step (1317).

8. The mechanical seal mechanism according to any one of claims 1 to 5, characterized by Further comprising a first sealing ring (14) and a second sealing ring (15), the first sealing ring (14) is clamped between the shell (12) and the first mounting sleeve (1301) of the sealing assembly (13), and the second sealing ring (15) is clamped between the shaft body (11) and the second mounting sleeve (1302) of the sealing assembly (13).

9. The mechanical seal mechanism according to any one of claims 1 to 5, characterized by Also included are a first bearing (16), a second bearing (17), a first baffle (18), a cover plate (19), a second baffle (20), and a rear cover (21); the first baffle (18), the housing (12), the cover plate (19), and the rear cover (21) are sequentially arranged along the axial direction of the shaft body (11); The outer circumferential side of the shaft body (11) is provided with a first shaft shoulder and a second shaft shoulder, the inner wall of the accommodating groove of the housing (12) is provided with a limiting hole shoulder, the first baffle (18) and the cover plate (19) are both installed on the housing (12) through threaded fasteners, the housing (12) is rotationally connected with the shaft body (11) through the first bearing (16), the shaft body (11) is rotationally connected with the cover plate (19) through the second bearing (17), at least part of the first bearing (16) is located between the limiting hole shoulder and the first shaft shoulder, at least part of the first bearing (16) is located between the limiting hole shoulder and the first baffle (18), the sealing assembly (13) is arranged between the limiting hole shoulder and the cover plate (19), the second baffle (20) is installed on the end of the shaft body (11) through threaded fasteners, the rear cover (21) is installed on the housing (12) through threaded fasteners, at least part of the second bearing (17) is located between the second baffle (20) and the second shaft shoulder, and at least part of the second bearing (17) is located between the cover plate (19) and the rear cover (21).

10. The mechanical seal mechanism of claim 9, wherein, The sealing assembly (13) has a plurality of and is sequentially arranged along the axial direction of the shaft body (11), all the sealing assemblies (13) are clamped between the limiting hole shoulder and the cover plate (19), the first channel (1101) has a plurality of, and a plurality of the first channels (1101) correspond one-to-one with the second channels (1311) on the second mounting sleeve (1302) of the plurality of sealing assemblies (13).

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