Mechanical sealing structure and sand mill comprising same

Abstract

The utility model discloses a mechanical sealing structure and a sand mill comprising the mechanical sealing structure, which belong to the technical field of mechanical sealing, and comprise a rotating part and a static part, the rotating part is provided with a moving ring, the static part is provided with a static ring, and the static ring is in running fit with the moving ring; a groove is formed in the face, corresponding to the static ring, of the static piece, and a first sealing ring and a wave spring which extrudes the first sealing ring towards the material side are installed in the groove. According to the utility model, the problem of sealing failure caused by damage of a mechanical sealing structure in the sand mill under a high-viscosity working condition can be effectively solved, so that the leakage of sealing materials can be effectively avoided, the continuous operation time of equipment is prolonged, the maintenance and replacement periods of the equipment are prolonged, and the operation cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical seal technology, specifically, it relates to a mechanical seal structure and a sand mill including the mechanical seal structure. Background Technology

[0002] Sand mills are widely used in mixing and grinding operations in industries such as food, petrochemicals, emulsification, and paint. Their traditional seals are packing, single-end face, or double-end face spring-type mechanical seals. The sand mill industry is developing rapidly, particularly in the field of nanomaterials for new energy.

[0003] In the rotary shaft seal system of lithium-ion battery new energy sand mills, common sealing materials are micro powder, nano powder abrasives, and zirconium beads. These materials are viscous pastes with poor flowability. During operation, the mechanical seal structure on existing sand mills suffers from material buildup and scaling on the sealing side because the material cannot be agitated. Furthermore, material accumulates in the gaps between the floating stationary ring and the sealing seat, O-ring, and groove, ultimately causing the floating stationary ring and sealing seat to jam and malfunction.

[0004] Meanwhile, when existing O-rings are first installed, they are not subjected to operating pressure. As a result, after being subjected to the mechanical pressure of the grooves, although the O-ring closes the fluid passage, its cross-section is no longer circular. Under subsequent operating pressure, the O-ring is forced to squeeze (but not into) the narrow gap between the mating surfaces, thereby obtaining a larger contact area and sealing stress. When the pressure on the O-ring reaches its pressure limit, a small portion of the sealing material is squeezed into the groove gap. When the operating pressure is further increased, the surface tension of the seal is no longer sufficient to stop the "flow," and the material is squeezed out into the open channel or gap, causing the O-ring to fail due to extrusion. Utility Model Content

[0005] The purpose of this utility model is to provide a mechanical seal structure and a sand mill containing the mechanical seal structure, which can effectively solve the problem of sealing failure caused by damage to the mechanical seal structure in the sand mill under high viscosity conditions, thereby effectively avoiding leakage of the sealing material, extending the continuous operation time of the equipment, extending the maintenance and replacement cycle of the equipment, and reducing operating costs.

[0006] To achieve the purpose of this utility model, the technical solution adopted is as follows: a mechanical seal structure, including a rotating part and a stationary part, wherein a rotating ring is installed on the rotating part, and a stationary ring is installed on the stationary part, and the stationary ring and the rotating ring are rotatably engaged; a groove is formed on the side of the stationary part corresponding to the stationary ring, and a first sealing ring and a wave spring that squeezes the first sealing ring toward the material side are installed in the groove.

[0007] Furthermore, a flat washer is also installed in the groove, and the flat washer is located between the first sealing ring and the wave spring.

[0008] Furthermore, the groove opening on the stationary component has a smooth transition with the material side of the stationary component.

[0009] Furthermore, a bushing and a support are fixedly installed on the rotating component. The support is located at the end of the bushing, and the rotating ring is fixed on the side of the support near the stationary component.

[0010] Furthermore, the bushing also has a limiting step to restrict the moving ring, with the limiting step and the support seat located on both sides of the moving ring, respectively.

[0011] Furthermore, second sealing rings are installed between the bushing and the rotating component, between the support base and the rotating ring, and between the bushing and the rotating ring.

[0012] Furthermore, there are two support seats, two rotating rings, and two stationary rings. The two support seats are located at both ends of the bushing, the two rotating rings are installed on the two support seats, and the two stationary rings are located on both sides of the stationary part and cooperate with the two rotating rings respectively.

[0013] Furthermore, a spring is also installed on the stationary component to push the stationary ring against the moving ring.

[0014] Furthermore, the stationary component, stationary ring, rotating ring, and bushing together form a sealed cavity, and the stationary component has an inlet hole that can communicate with the sealed cavity, and a detachable sealing component is installed in the inlet hole.

[0015] A sand mill, comprising the mechanical seal structure described above.

[0016] The beneficial effects of this utility model are:

[0017] 1. In this utility model, the wave spring applies a thrust greater than the medium pressure of the equipment cavity, causing the first sealing ring to deform during installation and tightly adhere to the groove opening, thereby preventing material from entering the groove and preventing the accumulation of particulate material in the groove. This ensures the excellent follow-up compensation performance of the static ring and effectively extends the service life of the seal.

[0018] 2. By setting a second sealing ring between the support seat and the rotating ring, the material is effectively prevented from entering the tiny gap between the end face of the rotating ring and the support seat, avoiding jamming between the rotating ring and the support seat, and preventing sealing failure caused by the rotating ring losing its follow-up property. Attached Figure Description

[0019] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.

[0020] Figure 1 This is a schematic diagram of the mechanical seal structure provided by this utility model;

[0021] Figure 2 This is a structural diagram of a flat washer;

[0022] Figure 3 This is a structural diagram of a wave spring;

[0023] Figure 4 This is a side view of a wave spring.

[0024] The attached diagram shows the markings and corresponding component names:

[0025] 1. Rotating component, 2. Stationary component, 3. Bushing, 4. Limiting step, 5. Support seat, 6. Moving ring, 7. Stationary ring, 8. Groove, 9. Wave spring, 10. Flat washer, 11. First sealing ring, 12. Smooth transition, 13. Spring, 14. Sealing cavity, 15. Liquid inlet, 16. Second sealing ring. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.

[0027] It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] like Figures 1 to 4As shown, the mechanical seal structure provided by this utility model includes a rotating component 1 and a stationary component 2. The rotating component 1 is a rotating shaft, and the stationary component 2 is a flange or equipment housing, etc., mounted on the equipment housing. A bushing 3 is fixedly mounted on the rotating component 1, with one end of the bushing 3 extending into the equipment and the other end of the bushing 3 approaching or extending to the outside of the stationary component 2. A support base 5 is also mounted on the rotating component 1, located at the end of the bushing 3 near the equipment interior. A rotating ring 6 is fixedly mounted on the end of the support base 5 near the equipment exterior. The rotating ring 6 and the support base 5 are... A second sealing ring 15 is also installed in the middle. The second sealing ring 15 is an O-ring and is located on the side of the support 5 away from the rotating shaft. A stationary ring 7 is also installed on the stationary part 2. The stationary ring 7 and the rotating ring 6 are in sliding sealing cooperation. A groove 8 is opened on the side of the stationary part 2 that cooperates with the stationary ring 7. The groove 8 is located on the end of the stationary part 2 that is close to the inside of the equipment. A first sealing ring 11 is installed in the groove 8. The first sealing ring 11 is also an O-ring. A wave spring 9 is also installed in the groove 8. The wave spring 9 is located on the side of the groove 8 away from the inside of the equipment.

[0029] When the wave spring 9 and the first sealing ring 11 are installed together in the groove 8, the wave spring 9 uses its own elastic force to squeeze the first sealing ring 11 towards the inside of the groove 8, thereby deforming the first sealing ring 11 and making it tightly adhere to the inside of the groove 8. This seals the mating surface between the stationary part 2 and the stationary ring 7, effectively preventing material from entering the groove 8 and preventing the accumulation of particulate material in the groove 8. This ensures the excellent follow-up compensation performance of the stationary ring and effectively extends the service life of the seal.

[0030] Because there is a tiny gap between the end face of the rotating ring 6 and the support seat 5, particulate material is prone to accumulate in this gap during equipment operation, causing jamming between the rotating ring 6 and the support seat 5, resulting in loss of the rotating ring 6's follow-up function and sealing failure. In this utility model, by installing a second sealing ring 15 between the support seat 5 and the rotating ring 6, the material is effectively prevented from entering the tiny gap between the end face of the rotating ring 6 and the support seat 5, avoiding jamming between the rotating ring 6 and the support seat 5, and preventing sealing failure caused by loss of the rotating ring 6's follow-up function.

[0031] In this invention, a flat washer 10 is also installed in the groove 8. The flat washer 10 is located between the wave spring 9 and the first sealing ring 11, preventing direct contact between the wave spring 9 and the first sealing ring 11. This ensures that the elastic force of the wave spring 9 first acts on the flat washer 10, and then the flat washer 10 evenly acts on the first sealing ring 11, preventing localized deformation of the first sealing ring 11 and ensuring more uniform compression, thus guaranteeing the sealing effect of the groove 8. The thrust applied by the wave spring 9 to the flat washer 10 is greater than the pressure of the internal medium, preventing excessive internal medium pressure from affecting the deformation of the first sealing ring 11, ensuring the deformation of the first sealing ring 11, and thus guaranteeing the sealing effect of the groove 8.

[0032] In this invention, on the side of the stationary member 2 that mates with the stationary ring 7, an arc transition is made from the end face of the stationary member 2 near the inside of the equipment to the groove opening of the groove 8. This allows the first sealing ring 11 to expand as much as possible at the groove opening of the groove 8 when it is deformed by compression, preventing the first sealing ring 11 from entering between the mating surfaces of the stationary member 2 and the stationary ring 7 and being damaged when compressed. This not only ensures the service life of the first sealing ring 11, but also effectively prevents material from entering the groove 8 due to the failure of the first sealing ring 11.

[0033] In this utility model, in order to ensure that the installation of the moving ring 6 is more stable, the bushing 3 also has a limiting step 4. When the moving ring 6 is installed, one side of the moving ring 6 is pressed against the limiting step 4, and the other side of the moving ring 6 is pressed against and fixed on the support seat 5, so that both sides of the moving ring 6 are restricted by the limiting step 4 and the support seat 5 respectively, thereby making the installation of the moving ring 6 more stable.

[0034] In this invention, to prevent material from entering the gap between the bushing 3 and the rotating part 1, a second sealing ring 15 is also installed between the end of the bushing 3 and the rotating part 1. Simultaneously, to prevent material from entering the gap between the support base 5 and the rotating part 1 and between the support base 5 and the moving ring 6, a second sealing ring 15 is also installed between the moving ring 6 and the bushing 3. Alternatively, the moving ring 6, the bushing 3, and the support base 5 can all be fitted with the second sealing ring 15. In this case, a flange is provided on the side of the support base 5 near the moving ring 6, so that the moving ring 6 and the flange cooperate to form a sealing ring mounting groove. The second sealing ring 15 is installed in this sealing groove, and the surface of the moving ring 6 near the rotating part 1 and the surface of the flange near the rotating part 1 cooperate with the surface of the bushing 3.

[0035] To ensure the fit between the stationary ring 7 and the rotating ring 6, a spring 13 extending towards the rotating ring 6 is also installed on the stationary part 2. The spring 13 pushes the stationary ring 7 against the rotating ring 6 with its own elastic force, so that the rotating ring 6 and the stationary ring 7 achieve a sliding seal fit.

[0036] In another embodiment, based on the above, two support seats 5, a moving ring 6, and a stationary ring 7 can be provided simultaneously. In this case, the two support seats 5 are located at both ends of the bushing 3, the two moving rings 6 are respectively installed on the opposite surfaces of the two support seats 5, and the two stationary rings 7 are respectively installed on both sides of the stationary member 2. Two springs 13 extending towards the stationary rings 7 are respectively installed on the stationary member 2. The two springs 13 respectively press the two stationary rings 7 against the two moving rings 6, so that the two moving rings 6 and the two stationary rings 7 respectively achieve a sliding sealing fit.

[0037] It should be noted that when there are two support bases 5, two rotating rings 6, and two stationary rings 7, the sealing method between the stationary ring 7, which is away from the equipment, and the stationary component 2 can be the same as the sealing method between the stationary ring 7, which is close to the equipment, and the stationary component 2. Alternatively, a first sealing ring 11 can be directly set between the stationary ring 7, which is away from the equipment, and the groove 8 opening at the end of the stationary component 2 away from the equipment can be a rounded transition. Alternatively, a plane transition can be directly set between the end face of the stationary component 2, which is away from the equipment, and the groove 8 opening at the end of the stationary component 2 away from the equipment.

[0038] In addition, when there are two support bases 5, two rotating rings 6, and two stationary rings 7, the end of the bushing 3 away from the inside of the equipment is also sealed with the rotating part 1 using the second sealing ring 15. The stationary ring 7 away from the inside of the equipment, the rotating ring 6 away from the inside of the equipment, and the end of the bushing 3 away from the inside of the equipment can also be sealed with the second sealing ring 15.

[0039] With two support bases 5, two rotating rings 6, and two stationary rings 7, the stationary component 2, the two stationary rings 7, the two rotating rings 6, and the bushing 3 together form a sealing cavity 14. The stationary component 2 has an inlet hole 15 that can connect to the sealing cavity 14. After the mechanical seal structure is installed on the equipment, the isolation fluid can be injected into the sealing cavity 14 through the inlet hole 15. Then, the inlet hole 15 is sealed with a sealing component. When the equipment is running, the isolation fluid in the sealing cavity 14 can seal the friction pair and provide lubrication and cooling, ensuring that the mechanical seal structure can operate for a long time.

[0040] In another embodiment, the present invention also provides a sand mill that includes the mechanical seal structure described above.

[0041] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] Those skilled in the art should understand that the above embodiments are merely for clearly illustrating the present invention and are not intended to limit the scope of the present invention. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A mechanical seal structure, characterized in that, It includes a rotating part (1) and a stationary part (2). A rotating ring (6) is installed on the rotating part (1), and a stationary ring (7) is installed on the stationary part (2). The stationary ring (7) and the rotating ring (6) are rotatably engaged. A groove (8) is provided on the side of the stationary part (2) corresponding to the stationary ring (7). A first sealing ring (11) and a wave spring (9) that squeezes the first sealing ring (11) toward the material side are installed in the groove (8).

2. The mechanical seal structure according to claim 1, characterized in that, A flat washer (10) is also installed in the groove (8), and the flat washer (10) is located between the first sealing ring (11) and the wave spring (9).

3. The mechanical seal structure according to claim 1, characterized in that, The groove (8) on the stationary part (2) has a smooth transition (12) with the material side of the stationary part (2).

4. The mechanical seal structure according to claim 1, characterized in that, The rotating part (1) is also fixedly mounted with a bushing (3) and a support seat (5). The support seat (5) is located at the end of the bushing (3), and the moving ring (6) is fixed on the side of the support seat (5) near the stationary part (2).

5. The mechanical seal structure according to claim 4, characterized in that, The bushing (3) also has a limiting step (4) for restricting the moving ring (6), and the limiting step (4) and the support seat (5) are located on both sides of the moving ring (6).

6. The mechanical seal structure according to claim 4, characterized in that, A second sealing ring (16) is installed between the bushing (3) and the rotating part (1), between the support base (5) and the moving ring (6), and between the bushing (3) and the moving ring (6).

7. The mechanical seal structure according to claim 1, characterized in that, The stationary part (2) is also equipped with a spring (13) that pushes the stationary ring (7) against the moving ring (6).

8. The mechanical seal structure according to any one of claims 1 to 7, characterized in that, There are two support seats (5), two moving rings (6), and two stationary rings (7). The two support seats (5) are located at both ends of the bushing (3), the two moving rings (6) are installed on the two support seats (5), and the two stationary rings (7) are located on both sides of the stationary part (2) and cooperate with the two moving rings (6).

9. The mechanical seal structure according to claim 8, characterized in that, The stationary component (2), stationary ring (7), moving ring (6), and bushing (3) together form a sealing cavity (14). The stationary component (2) has an inlet hole (15) that can connect to the sealing cavity (14), and a detachable sealing component is installed in the inlet hole (15).

10. A sand mill, characterized in that, Includes the mechanical seal structure as described in any one of claims 1 to 9.

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