Double-end-face mechanical seal and stirring equipment made of double-end-face mechanical seal

Abstract

The invention provides a double-end-face mechanical seal and stirring equipment manufactured by the same, the mechanical seal comprises a mounting seat, a shaft sleeve, a static ring, a moving ring, a pressure spring and a clamp spring, the shaft sleeve is sleeved on a stirring shaft, a first side of the mounting seat extends to form a bearing part, a second side of the mounting seat extends to form a bearing wall, a third side of the mounting seat is provided with a connecting table, and the bearing part and the bearing wall have a fall. A pipeline is arranged in the mounting seat, an inner opening and an outer opening of the pipeline are arranged on a bearing portion and a connecting table of the mounting seat respectively, the static rings are arranged on the upper side and the lower side of the connecting table respectively and connected with the connecting table through compression springs, the static rings are attached to the bearing wall, the top faces of the static rings are higher than the bearing wall, and the movable ring is sleeved outside the shaft sleeve and connected with the shaft sleeve in a matched mode through a clamping spring so as to limit the movable ring. And a sealing cavity is defined among the mounting seat, the shaft sleeve, the static ring and the moving ring, so that sealing liquid is filled in the sealing cavity through a pipeline of the mounting seat. Therefore, the mechanical sealing structure is miniaturized and does not need to be fixed by a fixed disc, and the problem that the sealing surface structure is low-lying is solved.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical seals, and in particular to a double-end-face mechanical seal and a stirring device made of the same. Background Art

[0002] During the preparation of sodium-ion battery slurry, the battery slurry in the equipment needs to be continuously stirred and maintained at a temperature of about 70°C. Therefore, in order to maintain the sealing of the stirring shaft and prevent the battery slurry from leaking during rotation, a mechanical seal needs to be installed on the stirring shaft of such equipment.

[0003] Conventional mechanical seals currently on the market, such as the structure of the "Agitator Mechanical Seal with Positioning Bearing" provided by Chinese Patent Publication No. CN201062663Y, are generally large in size due to the need to fix the rotating body components through a fixed disk in its design. In addition, the sealing surface of the mechanical seals of the existing technology is generally lower than the lowest liquid level when the slurry is discharged due to poor considerations during design. Therefore, when such mechanical seals are installed horizontally or at the bottom, it is easy to form a low-lying area at the sealing surface, so that the slurry remains there and cannot be discharged, which in turn causes the remaining battery slurry to dry and agglomerate, destroying the sealing surface of the mechanical seal, causing seal failure, and even fire in severe cases. Summary of the invention

[0004] To this end, the main purpose of the present invention is to provide a double-end mechanical seal and a stirring device made thereof, so as to miniaturize the mechanical seal structure and solve the problem of low-lying sealing surface structure without relying on a fixed plate for fixation.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a double-end mechanical seal is provided, which is sleeved on a stirring shaft and comprises: a mounting seat, a sleeve, a static ring, a dynamic ring, a clamping spring and a retaining spring. The sleeve is sleeved on the stirring shaft, a bearing portion is extended from a first side of the mounting seat, a bearing wall is extended from a second side, and a connecting platform is provided on a third side. The bearing portion and the bearing wall have a drop. A pipeline is provided in the mounting seat, and the inner and outer ports of the pipeline are respectively arranged on the bearing portion and the connecting platform of the mounting seat. The static ring is respectively arranged on the upper and lower sides of the connecting platform and is connected to the connecting platform via a clamping spring. The static ring is in contact with the bearing wall, and the top surface of the static ring is higher than the bearing wall. The dynamic ring is sleeved outside the sleeve and matched with the sleeve via a retaining spring to limit the dynamic ring, so that it abuts against the static ring to form a friction pair, and a sealing cavity is defined between the mounting seat, the sleeve, the static ring and the dynamic ring to be filled with sealing liquid through the mounting seat pipeline.

[0006] In a possible preferred embodiment, the double-end mechanical seal further includes: a first stop pin, wherein connecting holes are arranged at intervals on the stationary ring and the connecting platform, the first stop pin and the clamping spring are respectively connected to the stationary ring and the connecting platform through the connecting holes, and the first stop pin and the clamping spring are staggered.

[0007] In a possible preferred embodiment, the double-end mechanical seal also includes: a second stop pin, wherein an abutment platform extends outward from the first side of the movable ring, a first stop opening is provided on one side of the abutment platform, a bearing platform is provided on the outer side of the sleeve, and a second stop opening is provided on the bearing platform, and the movable ring is limited by a retaining spring and rests against the side of the bearing platform, so that the first stop opening on the abutment platform and the second stop opening on the bearing platform are combined into a stop pin hole for the second stop pin to be inserted into the positioning movable ring.

[0008] In a possible preferred embodiment, the stationary ring is in a stepped ring shape, wherein the ring body at the top of the stationary ring is thinner than the bottom ring body, and the thickness of the bottom ring body of the stationary ring is substantially flush with the connecting platform.

[0009] In a possible preferred embodiment, the double-end mechanical seal also includes: a first sealing ring, a second sealing ring, and a third sealing ring, wherein a first sealing groove is provided on the bearing wall where it abuts against the static ring, and the first sealing ring is embedded in the first sealing groove; a second sealing groove is provided at the outer side of the sleeve where it abuts against the dynamic ring, and the second sealing ring is embedded in the second sealing groove; a third sealing groove is provided at the interface between the inner side of the sleeve and the stirring sleeve, and the third sealing ring is embedded in the third sealing groove.

[0010] In a possible preferred embodiment, the double-end mechanical seal further includes: a temperature sensor, which is arranged on the mounting seat, and the detection end of the temperature sensor is in contact with the sealing liquid.

[0011] In a possible preferred embodiment, the double-end mechanical seal further includes: a fixing piece, wherein the sleeve is positioned and connected to the stirring shaft via the fixing piece.

[0012] In a possible preferred embodiment, the intersection of the top surface and the side surface of the dynamic ring is in an arc transition shape.

[0013] In order to achieve the above-mentioned purpose, according to another aspect of the present invention, a stirring device is also provided, which includes: a hopper, a stirring shaft, a driver, and a mechanical seal, wherein the stirring shaft is connected to the driver, and the mechanical seal is sleeved on the outside of the stirring shaft, wherein the hopper is connected to the mechanical seal, and the mechanical seal adopts the structure of a double-end mechanical seal as described in any of the above, wherein an interface ring is provided at the bottom opening of the hopper, the interface ring is sleeved on the outside of the bearing wall of the mounting seat, and is bolted to its bearing part, and a discharge pipe is opened laterally at the bottom of the hopper, and the bottom of the discharge pipe is basically flush with the interface ring and the top of the bearing wall.

[0014] In a possible preferred embodiment, the stirring device further includes: a fourth sealing ring, wherein a fourth sealing groove is provided on the bearing wall where it abuts against the interface ring, and the fourth sealing ring is embedded in the fourth sealing groove.

[0015] Through the double-end mechanical seal provided by the present invention and the stirring equipment made of it, a mechanical seal with a compact structure is cleverly designed, and a sealing cavity is defined in the compact space between the mounting seat, the sleeve, the static ring, and the dynamic ring, so that the sealing surface of the elastic friction pair established between the static and dynamic rings and the compression spring can be closely fitted while the internal pressure and heat dissipation effect are formed by pouring the sealing liquid, ensuring that there will be no liquid outflow and leakage when the static and dynamic rings slide relative to each other. At the same time, because the dynamic ring can contact the slurry on the outside, the slurry can be thrown off by centrifugal force during the rotation process to prevent the slurry from directly penetrating into the sealing surface, thereby ensuring the reliability of the mechanical seal.

[0016] In addition, due to the compact structural design of the mechanical seal in this case, the sleeve can be directly fixed on the agitator shaft and no longer relies on connections such as fixed plates, which greatly reduces the size and space requirements. It also allows the hopper to be directly mounted on the mounting seat and make the sealing surface slightly higher than the bottom of the discharge pipe, as well as the top of the interface ring and the bearing wall, so that the slurry will not be retained on the sealing surface, eliminating the hidden danger of the slurry drying and affecting the sealing surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 to Figure 2 It is a schematic diagram of the cross-sectional structure of the double-end mechanical seal of the present invention at different angles;

[0019] Figure 3 It is a schematic diagram of the top view of the double-end mechanical seal structure of the present invention;

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the stirring device of the present invention.

[0021] Description of Reference Numerals

[0022] Mounting seat 1, sleeve 2, static ring 3, dynamic ring 4, compression spring 5, retaining ring 6, hopper 7, fastener 8, stirring shaft 9, mechanical seal 10, bearing part 11, bearing wall 12, connecting platform 13, pipeline 14, inner port 15, outer port 16, sealing chamber 17, temperature sensor 18, bearing platform 21, second stop port 22, third sealing ring 23, first stop pin 31, first sealing ring 32, second stop pin 41, abutment platform 42, first stop port 43, second sealing ring 44, interface ring 91, discharge pipe 92, fourth sealing ring 93. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. The terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0027] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly stipulated and limited, the terms "set", "layout", "installation", "connection" and "connection" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances and in combination with the prior art. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other unless there is a conflict. And one or more of the components in the diagram may be necessary or non-essential, and the relative position relationship between the components in the above diagram can be adjusted according to actual needs.

[0029] In order to achieve the miniaturization of the mechanical seal structure, and to solve the problem of low-lying sealing surface structure without relying on the fixed plate for fixing. Figures 1 to 3 As shown, the present invention provides a double-end mechanical seal, an example of which mainly includes: a mounting seat 1, a sleeve 2, a stationary ring 3, a dynamic ring 4, a compression spring 5, and a retaining spring 6.

[0030] Among them Figure 1 As shown, the sleeve 2 is sleeved on the stirring shaft 9, wherein in order to improve the reliability of the sleeve fixation, in an optional example, the sleeve 2 is positioned and connected to the stirring shaft 9 via a fastener 8 (such as a set screw); the mounting seat 1 is installed as a whole at the corresponding flange of the equipment, and a bearing portion 11 extends from the first side of the mounting seat 1, i.e., the left side of the mounting seat 1, a bearing wall 12 extends from the second side, i.e., the middle side of the mounting seat 1, and a connecting platform 13 is provided on the third side, i.e., the right side of the mounting seat 1. A pipe 14 is provided in the mounting seat 1, and the inner and outer ports 15 and 16 of the pipe 14 are respectively arranged on the bearing portion 11 and the connecting platform 13 of the mounting seat 1, wherein the bearing portion 11 and the bearing wall 12 have a drop to define a bearing area at the drop to provide structural support for the bearing hopper 7.

[0031] The static ring 3 is arranged on the upper and lower sides of the connecting platform 13, and is connected to the connecting platform 13 via a compression spring 5. The static ring 3 is in contact with the bearing wall 12 to elastically expand and contract along the bearing wall 12, and the top surface of the static ring 3 is always higher than the bearing wall 12. The dynamic ring 4 is sleeved on the outside of the shaft sleeve 2, and is matched with the shaft sleeve 2 via a retaining spring 6 to limit the dynamic ring 4, so that it is pressed against the top surface of the static ring 3 to form a friction pair, and a compact sealing cavity 17 is defined between the mounting seat 1, the shaft sleeve 2, the static ring 3, and the dynamic ring 4 to be filled with sealing liquid through the pipe 14 of the mounting seat 1.

[0032] In addition, Figure 2 As shown, in this example, in order to enhance the heat dissipation of the stationary ring 3 , inner openings 15 of the pipe 14 may be arranged on the upper and lower sides of the connecting platform 13 of the mounting seat 1 , so that the sealing liquid contacts the stationary ring 3 first when entering the sealing cavity 17 .

[0033] With this setting, if Figure 2 As shown, the sealing liquid can enter the pipeline 14 from the LBI outer port 16 on one side of the mounting seat 1 to be poured into the sealing cavity 17. After that, the sealing liquid is diverted through the inner port 15 and discharged from the LBO outer port 16 on the other side of the mounting seat 1. In this way, the sealing cavity 17 and the contact surfaces of the components in the cavity are cooled and lubricated to protect the sealing structure. At the same time, the sealing cavity 17 is poured with the sealing liquid, and internal pressure is also generated to apply pressure to the sealing surfaces of the static and dynamic rings 3 and 4. With the help of the compression spring 5, the sealing surfaces can be tightly fitted to avoid leakage.

[0034] In addition, in order to be able to monitor the temperature in the sealing chamber 17 in real time, in an optional example, the double-end mechanical seal also includes: a temperature sensor 18, which is arranged on the mounting seat 1, and the detection end of the temperature sensor 18 is in contact with the sealing liquid, so as to detect the temperature in the sealing chamber 17 in real time to provide an early warning to prevent damage to the seal caused by excessive temperature.

[0035] Furthermore, in order to stabilize the friction between the stationary ring 3 and the dynamic ring 4 at the sealing surface, in an optional example, as Figure 1 As shown, the double-end mechanical seal also includes: a first stop pin 31, wherein the stationary ring 3 and the connecting platform 13 are provided with connecting holes at intervals, the first stop pin 31 and the clamping spring 5 are respectively connected to the stationary ring 3 and the connecting platform 13 through the connecting holes, and the first stop pin 31 and the clamping spring 5 are staggered, so as to limit the lateral displacement of the stationary ring 3 and position it, so that the stationary ring 3 can reliably cling to the bearing wall 12 of the mounting seat 1, and the clamping spring 5 pushes the contact surface of the dynamic ring 4 to pressurize it, ensuring that the contact surfaces of the stationary ring 3 and the dynamic ring 4, and the stationary ring 3 and the bearing wall 12 always remain tightly sealed.

[0036] Furthermore, in order to prevent the relative rotation of the moving ring 4 and the stirring shaft 9 to generate friction, in an optional embodiment, the double-end mechanical seal also includes: a second stop pin 41, wherein in order to improve the heat dissipation effect of the moving ring 4 and ensure that the second stop pin 41 has sufficient supporting strength, the structure of the contact surface area between the moving ring 4 and the stationary ring 3 cannot be designed to be too thick, so that it is conducive to heat dissipation and the heat of the contact surface can be quickly dissipated. Therefore, in this example, the first side of the moving ring 4 is cleverly designed to extend outward in a slope shaped abutment platform 42, one side of the abutment platform 42 is provided with a first stop opening 43, the outer side of the sleeve 2 is provided with a bearing platform 21, the bearing platform 21 is provided with a second stop opening 22, the movable ring 4 is limited by the retaining spring 6 and leans against the side of the bearing platform 21, so that the first stop opening 43 on the abutment platform 42 and the second stop opening 22 of the bearing platform 21 are combined into a stop pin hole, so that the second stop pin 41 can be inserted into the positioning movable ring 4, thereby cleverly fixing the movable ring 4 in a compact structural design and improving the heat dissipation effect of the movable ring 4.

[0037] Corresponding to the above example of the dynamic ring 4, in order to improve the heat dissipation effect of the static ring 3, in an optional embodiment, as Figure 1 As shown, the stationary ring 3 can be designed to be a stepped ring, wherein the ring body at the top of the stationary ring 3 is thinner than the bottom ring body, and the thickness of the bottom ring body of the stationary ring 3 is substantially flush with the connecting platform 13 .

[0038] Through this design, in the compact sealing cavity 17, on the one hand, the thickness of the contact area between the static ring 3 and the dynamic ring 4 can be thinned to improve the heat dissipation effect thereof; on the other hand, through the stepped structure of the static ring 3, a space is reserved in the sealing cavity 17 to guide the sealing liquid to the contact surface between the static ring 3 and the dynamic ring 4, thereby greatly improving the heat dissipation efficiency here, and the internal pressure effect formed by the sealing liquid here will also more directly repel the external slurry from penetrating through the sealing surface, thereby stabilizing the sealing effect.

[0039] In fact, it can be seen from the sealing structure design of the above example that the dynamic ring 4 is always exposed to the atmosphere or slurry, and there is a step-like transition between the dynamic ring 4 and the bearing wall 12 of the mounting seat 1, and the static ring 3 is designed to be only slightly higher than the bearing wall 12, so that the sealing surface is actually located at the stepped corner of the bearing wall 12 and the dynamic ring 4. At this point, the dynamic ring 4 will generate centrifugal force as the stirring shaft 9 rotates, thereby throwing off the slurry and splashing it parabolically toward the bearing wall 12 away from the stepped corner. Therefore, the structural design makes it difficult for the slurry to remain on the sealing surface. Even if there is a small amount of slurry remaining here, it will be squeezed out by the internal pressure of the sealing liquid and the pressure of the compression spring 5, thereby avoiding slurry immersion or retention, thereby ensuring the reliability of the mechanical seal.

[0040] In addition, in an optional example, in order to better guide the flow of slurry on the dynamic ring 4, the intersection of the top surface and the side surface of the dynamic ring 4 is in an arc transition shape, so that the slurry remaining here can be better thrown away by centrifugal force and away from the sealing surface.

[0041] Furthermore, in order to enhance the sealing effect of the mechanical seal, in an optional embodiment, the double-end mechanical seal further includes: a first sealing ring 32, a second sealing ring 44, and a third sealing ring 23, wherein a first sealing groove is provided on the bearing wall 12 at the position where it abuts against the static ring 3, and the first sealing ring 32 is embedded in the first sealing groove; a second sealing groove is provided at the position where the outer side of the sleeve 2 abuts against the dynamic ring 4, and the second sealing ring 44 is embedded in the second sealing groove; a third sealing groove is provided at the joint surface between the inner side of the sleeve 2 and the stirring shaft 9, and the third sealing ring 23 is embedded in the third sealing groove.

[0042] On the other hand, corresponding to the above-mentioned double-end mechanical seal example, the present invention also provides a stirring device, such as Figure 4 As shown, it includes: a hopper 7, a stirring shaft 9, a driver, and a mechanical seal 10, wherein the mechanical seal 10 is a double-end mechanical seal structure as in any of the above examples, wherein the stirring shaft 9 is connected to the driver, the mechanical seal 10 is sleeved on the outside of the stirring shaft 9, and the hopper 7 is connected to the mechanical seal 10, wherein an interface ring 91 is provided at the bottom opening of the hopper 7, the interface ring 91 is sleeved on the outside of the bearing wall 12 of the mounting seat 1, and is bolted to the bearing portion 11 of the mounting seat 1 so that the interface ring 91 is fixed at the bearing area, and a discharge pipe 92 is opened laterally at the bottom of the hopper 7, and the bottom of the discharge pipe 92 is substantially flush with the interface ring 91 and the top of the bearing wall 12.

[0043] With this arrangement, not only can the hopper 7 be supported by the mechanical seal 10, but there will also be no low-lying area between the sealing surface of the mechanical seal 10 and the discharge pipe 92. When the slurry in the hopper 7 is discharged along the discharge pipe 92, it will no longer be retained at the sealing surface, thereby ensuring the reliability of the mechanical seal 10.

[0044] In addition, in order to ensure the sealing performance between the hopper 7 and the mechanical seal 10, in an optional embodiment, the stirring device further includes: a fourth sealing ring 93, wherein a fourth sealing groove is provided on the bearing wall 12 where the interface ring 91 abuts, and the fourth sealing ring 93 is embedded in the fourth sealing groove. This can further improve the sealing performance between the interface ring 91 and the bearing wall 12 to prevent slurry leakage.

[0045] In summary, through the double-end mechanical seal provided by the present invention and the stirring equipment made of it, a mechanical seal with a compact structure is cleverly designed, and a sealing chamber 17 is defined in the compact space between the mounting seat 1, the sleeve 2, the static ring 3, and the dynamic ring 4, so that the sealing surface of the elastic friction pair established between the static and dynamic rings 3, 4 and the clamping spring 5 can be tightly fitted while the sealing liquid is poured to form the internal pressure and heat dissipation effect, ensuring that there will be no liquid outflow and leakage when the static and dynamic rings 3, 4 slide relative to each other. At the same time, because the dynamic ring 4 can contact the slurry on the outside, the slurry can be thrown off by centrifugal force during the rotation process to prevent the slurry from directly penetrating into the sealing surface, thereby ensuring the reliability of the mechanical seal.

[0046] In addition, due to the compact structural design of the mechanical seal in this case, the sleeve 2 can be directly fixed on the agitator shaft 9, and no longer relies on connections through a fixed plate, etc., which greatly reduces the size and space requirements. At the same time, it also allows the hopper 7 to be directly mounted on the mounting seat 1, and the sealing surface is made slightly higher than the bottom of the discharge pipe 92, and the top of the interface ring 91 and the bearing wall 12, so that the slurry will not be retained on the sealing surface, eliminating the hidden danger of the slurry drying and affecting the sealing surface.

[0047] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is only limited by the claims and their full scope and equivalents. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0048] In addition, various implementation modes of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed by the embodiments of the present invention.

Claims

1. A double-end mechanical seal, which is sleeved on the stirring shaft, characterized in that include: A mounting seat, a sleeve, a static ring, a dynamic ring, a compression spring, and a retaining spring. The sleeve is sleeved on the stirring shaft. A bearing portion is extended from the first side of the mounting seat, a bearing wall is extended from the second side, and a connecting platform is provided on the third side. The bearing portion and the bearing wall have a height difference. A pipeline is provided in the mounting seat. The inner and outer openings of the pipeline are respectively arranged on the bearing portion and the connecting platform of the mounting seat. The static ring is respectively arranged on the upper and lower sides of the connecting platform and is connected to the connecting platform through a compression spring. The static ring is in contact with the bearing wall, and the top surface of the static ring is higher than the bearing wall. The dynamic ring is sleeved on the outside of the sleeve and is matched with the sleeve through a retaining spring to limit the dynamic ring, so that it is pressed against the static ring to form a friction pair, and a sealing cavity is defined between the mounting seat, the sleeve, the static ring, and the dynamic ring to be filled with sealing liquid through the pipe of the mounting seat.

2. The double-end mechanical seal according to claim 1, characterized in that: Also includes: The first stop pin, wherein the stationary ring and the connecting platform are provided with connecting holes at intervals, the first stop pin and the clamping spring are respectively connected to the stationary ring and the connecting platform through the connecting holes, and the first stop pin and the clamping spring are staggered.

3. The double-end mechanical seal according to claim 1, characterized in that: Also includes: The second stop pin, wherein a docking platform is extended outward from the first side of the movable ring, a first stop opening is provided on one side of the docking platform, a bearing platform is provided on the outer side of the sleeve, and a second stop opening is provided on the bearing platform. The movable ring is limited by a retaining spring and leans against the side of the bearing platform so that the first stop opening on the docking platform and the second stop opening on the bearing platform are combined into a stop pin hole for the second stop pin to be inserted into the positioning movable ring.

4. The double-end mechanical seal according to claim 3, characterized in that: The stationary ring is in a stepped ring shape, wherein the thickness of the ring body at the top of the stationary ring is smaller than that of the bottom ring body, and the thickness of the bottom ring body of the stationary ring is substantially flush with the connecting platform.

5. The double-end mechanical seal according to claim 1, characterized in that: Also includes: A first sealing ring, a second sealing ring, and a third sealing ring, wherein a first sealing groove is provided on the bearing wall where it abuts against the static ring, and the first sealing ring is embedded in the first sealing groove; a second sealing groove is provided on the outer side of the sleeve where it abuts against the dynamic ring, and the second sealing ring is embedded in the second sealing groove; a third sealing groove is provided at the interface between the inner side of the sleeve and the stirring sleeve, and the third sealing ring is embedded in the third sealing groove.

6. The double-end mechanical seal according to claim 1, characterized in that: Also includes: The temperature sensor is arranged on the mounting seat, and the detection end of the temperature sensor is in contact with the sealing liquid.

7. The double-end mechanical seal according to claim 1, characterized in that: Also includes: A fixing member, wherein the shaft sleeve is positioned and connected to the stirring shaft via the fixing member.

8. The double-end mechanical seal according to claim 1, characterized in that: The intersection of the top surface and the side surface of the dynamic ring is in an arc transition shape.

9. A stirring device comprising: A hopper, a stirring shaft, a driver, and a mechanical seal, wherein the stirring shaft is connected to the driver, and the mechanical seal is sleeved on the outside of the stirring shaft. It is characterized in that the hopper is connected to the mechanical seal, and the mechanical seal adopts the structure of a double-end mechanical seal as described in any one of claims 1 to 8, wherein an interface ring is provided at the bottom opening of the hopper, the interface ring is sleeved on the outside of the bearing wall of the mounting seat and is bolted to its bearing part, and a discharge pipe is opened laterally at the bottom of the hopper, and the bottom of the discharge pipe is basically flush with the interface ring and the top of the bearing wall.

10. The stirring device according to claim 9, characterized in that: Also includes: A fourth sealing ring, wherein a fourth sealing groove is provided on the bearing wall where it abuts against the interface ring, and the fourth sealing ring is embedded in the fourth sealing groove.

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