Mechanical sealing device and material pumping system

Abstract

The utility model provides a mechanical sealing device and a material pumping system, and the mechanical sealing device comprises a moving ring assembly which is provided with a first sealing end; the static ring assembly is provided with a second sealing end, and the second sealing end abuts against the first sealing end; the pressing assembly comprises a pressing part, a flange part and a first sealing ring, the pressing part abuts against the end, away from the movable ring assembly, of the static ring assembly, the flange part is arranged on the static ring assembly in a sleeving mode, and the first sealing ring is arranged between the static ring assembly and the flange part; the shielding assembly sleeves the static ring assembly, and the two ends of the shielding assembly are connected to the end, close to the movable ring assembly, of the flange part and the static ring assembly correspondingly; the shielding assembly is suitable for stretching out and drawing back in the arrangement direction of the movable ring assembly and the static ring assembly. According to the mechanical sealing device, the shielding assembly can be used for shielding the matching gap between the flange part of the pressing assembly and the static ring assembly, abrasion of materials to the first sealing ring located between the static ring assembly and the flange part is reduced, and the service life of the first sealing ring can be prolonged.

Description

Technical Field

[0001] The present disclosure relates to the technical field of material conveying, and in particular to a mechanical sealing device and a material pumping system. Background Art

[0002] When transporting organic solutions or slurries, pumping systems are often used to provide power and flow channels for material transfer. To ensure the tightness of the pumps, pumping systems are often equipped with mechanical seals. However, in practice, mechanical seals suffer from severe wear and tear on their auxiliary seal rings, resulting in a short service life and a high risk of seal failure. This increases the risk of pumping system failure and hinders continuous production. Utility Model Content

[0003] The present disclosure aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, a first aspect of the present disclosure provides a mechanical sealing device.

[0005] A second aspect of the present disclosure provides a material pumping system.

[0006] In view of this, according to a first aspect of an embodiment of the present disclosure, a mechanical sealing device is proposed, comprising:

[0007] A dynamic ring assembly having a first sealing end;

[0008] The stationary ring assembly has a second sealing end, the second sealing end abutting against the first sealing end;

[0009] The clamping assembly includes a clamping portion, a flange portion, and a first sealing ring. The clamping portion abuts against one end of the stationary ring assembly away from the dynamic ring assembly. The flange portion is sleeved on the stationary ring assembly. The first sealing ring is disposed between the stationary ring assembly and the flange portion.

[0010] The shielding assembly is sleeved on the static ring assembly, and the two ends of the shielding assembly are respectively connected to one end of the flange portion close to the dynamic ring assembly and the static ring assembly;

[0011] The shielding assembly is suitable for extending and retracting along the arrangement direction of the dynamic ring assembly and the static ring assembly.

[0012] In one possible embodiment, the shielding assembly includes:

[0013] The shielding sleeve is sleeved on the static ring assembly. The shielding sleeve is made of flexible material. The first connecting end of the shielding sleeve is fixedly connected to the static ring assembly, and the second connecting end of the shielding sleeve is fixedly connected to one end of the flange part close to the dynamic ring assembly.

[0014] In a feasible embodiment, the shielding assembly further includes:

[0015] A clamp is sleeved on the shielding sleeve and arranged close to the first connecting end, and the clamp is provided with a first connecting hole;

[0016] The first fastener passes through the first connecting hole and is connected to the stationary ring assembly.

[0017] In a feasible embodiment, the shielding assembly further includes:

[0018] A pressing plate is provided on the shielding sleeve, the second connecting end is located between the pressing plate and the flange portion, and the pressing plate is provided with a second connecting hole;

[0019] The second fastener passes through the second connecting hole and is connected to the flange portion.

[0020] In a possible embodiment, the shielding sleeve is made of rubber material.

[0021] In a feasible implementation manner, an accommodating cavity is formed between the shielding sleeve, the flange portion and the stationary ring assembly, and the accommodating cavity is used to accommodate grease.

[0022] In a feasible embodiment, the mechanical sealing device further includes:

[0023] The second sealing ring is sleeved on the flange portion.

[0024] In a feasible embodiment, the mechanical sealing device further includes:

[0025] The third sealing ring is arranged at one end of the dynamic ring assembly away from the static ring assembly.

[0026] In a feasible embodiment, the pressing portion includes:

[0027] a first limiting member;

[0028] A second limiting member abuts against one end of the stationary ring assembly away from the dynamic ring assembly, and the flange portion is fixedly connected to the first limiting member;

[0029] The elastic member is connected between the first limiting member and the second limiting member.

[0030] According to a second aspect of an embodiment of the present disclosure, a material pumping system is provided, comprising:

[0031] A mechanical sealing device as proposed in any one of the first aspects above.

[0032] Compared with the prior art, the present disclosure includes at least the following beneficial effects: the mechanical sealing device provided in the embodiment of the present disclosure includes a dynamic ring assembly, a static ring assembly, a clamping assembly and a shielding assembly. In actual applications, the mechanical sealing device can use the shielding assembly to block the fitting gap between the flange portion of the clamping assembly and the static ring assembly, thereby reducing the risk of material infiltration into the fitting gap between the flange portion and the static ring assembly during material conveying, thereby reducing the wear of the material on the first sealing ring located between the static ring assembly and the flange portion, extending the service life of the first sealing ring, and reducing the probability of sealing failure in the mechanical sealing device, which is conducive to ensuring the stable operation of the material pumping system and providing protection for the continuous production. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the exemplary embodiments below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present disclosure. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0034] Figure 1 A schematic structural diagram of a mechanical sealing device according to an embodiment of the present disclosure;

[0035] Figure 2 A schematic structural diagram of a shielding sleeve according to an embodiment of the present disclosure.

[0036] in, Figure 1 and Figure 2 The corresponding relationship between the reference numerals and component names is as follows:

[0037] 10 dynamic ring assembly; 11 dynamic ring body; 12 dynamic ring seat; 13 dynamic ring sealing ring; 14 dynamic ring snap ring; 15 dynamic ring transmission pin;

[0038] 20 static ring assembly; 21 static ring body; 22 static ring seat;

[0039] 30 clamping assembly; 31 clamping portion; 311 first position-limiting member; 312 second position-limiting member; 313 elastic member; 32 flange portion; 33 first sealing ring; 34 first anti-rotation pin; 35 first screw; 36 second screw; 37 flange positioning plate; 38 second anti-rotation pin;

[0040] 40 shielding assembly; 41 shielding sleeve; 42 clamp; 43 first fastener; 44 pressure plate; 45 second fastener; 401 accommodating cavity;

[0041] 50 bushings;

[0042] 60 second sealing ring;

[0043] 70 third sealing ring. DETAILED DESCRIPTION

[0044] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0045] like Figure 1 and Figure 2 As shown, according to the first aspect of an embodiment of the present disclosure, a mechanical sealing device is proposed, including: a dynamic ring assembly 10, having a first sealing end; a stationary ring assembly 20, having a second sealing end, the second sealing end abutting the first sealing end; a clamping assembly 30, including a clamping portion 31, a flange portion 32 and a first sealing ring 33, the clamping portion 31 abuts against one end of the stationary ring assembly 20 away from the dynamic ring assembly 10, the flange portion 32 is sleeved on the stationary ring assembly 20, and the first sealing ring 33 is arranged between the stationary ring assembly 20 and the flange portion 32; a shielding assembly 40, sleeved on the stationary ring assembly 20, the two ends of the shielding assembly 40 are respectively connected to one end of the flange portion 32 close to the dynamic ring assembly 10 and the stationary ring assembly 20; wherein, the shielding assembly 40 is suitable for telescoping along the arrangement direction of the dynamic ring assembly 10 and the stationary ring assembly 20.

[0046] The mechanical seal device provided by the embodiments of the present disclosure comprises a rotating ring assembly 10, a stationary ring assembly 20, a pressing assembly 30 and a shielding assembly 40. The rotating ring assembly 10 and the stationary ring assembly 20 can be used to be sleeved on the rotating shaft of the conveying pump, and the rotating ring assembly 10 and the stationary ring assembly 20 respectively have a first sealing end and a second sealing end, which abut against each other to form a sealing interface. The pressing assembly 30 comprises a pressing part 31, a flange part 32 and a first sealing ring 33. The pressing part 31 abuts against one end of the stationary ring assembly 20 away from the rotating ring assembly 10, and can be used to apply a force to the stationary ring assembly 20 towards the rotating ring assembly 10, thereby facilitating the close contact between the first sealing end and the second sealing end during the conveying of the material, and further ensuring the sealing effect. The flange part 32 is sleeved on the stationary ring assembly 20, and the first sealing ring 33 is arranged between the flange part 32 and the stationary ring assembly 20, thereby sealing the fit gap between the flange part 32 and the stationary ring assembly 20, avoiding the penetration of the material through the fit gap towards the pressing assembly 30, and facilitating the stable operation of the conveying pump. In actual application, the outer circumferential side of the flange part 32 can be used to be sealingly connected with the inner side of the casing of the conveying pump, thereby further preventing the penetration of the material towards the pressing assembly 30, and facilitating the stability of the flange part 32 and the stationary ring assembly 20. The shielding assembly 40 is sleeved on the stationary ring assembly 20 and connected with one end of the flange part 32 close to the rotating ring assembly 10 and the stationary ring assembly 20, respectively. Therefore, the shielding assembly 40 can be located between the first sealing end and one end of the flange part 32 close to the rotating ring assembly 10, and shield the fit gap between the flange part 32 and the stationary ring assembly 20. During the conveying of the material, the risk of the material penetrating into the fit gap between the flange part 32 and the stationary ring assembly 20 can be reduced, the wear of the first sealing ring 33 can be reduced, the service life of the first sealing ring 33 can be prolonged, the probability of the sealing failure of the mechanical seal device and the maintenance and replacement cost can be reduced, the stable operation of the material pumping system can be ensured, the continuous production can be ensured, and the shielding assembly 40 can be extended or shortened along the arrangement direction of the rotating ring assembly 10 and the stationary ring assembly 20. Therefore, if the stationary ring assembly 20 moves along the arrangement direction relative to the flange part 32 during use, the shielding assembly 40 can adapt to the movement by being extended or shortened, thereby facilitating the close contact between the stationary ring assembly 20 and the rotating ring assembly 10 under the action of the pressing assembly 30, and enabling the mechanical seal device to protect the first sealing ring 33 by using the shielding assembly 40, while reducing the influence of the arrangement of the shielding assembly 40 on the cooperation between the rotating ring assembly 10, the stationary ring assembly 20 and the pressing assembly 30.

[0047] It can be understood that, in actual application, the arrangement direction of the rotating ring assembly 10 and the stationary ring assembly 20 is the axial direction of the rotating shaft of the conveying pump.

[0048] Based on this, the mechanical sealing device provided in the first aspect of the present disclosure can use the shielding assembly 40 to cover the fitting gap between the flange portion 32 of the clamping assembly 30 and the static ring assembly 20, thereby reducing the risk of material infiltration into the fitting gap between the flange portion 32 and the static ring assembly 20 during the material conveying process, and further reducing the wear of the material on the first sealing ring 33 located between the static ring assembly 20 and the flange portion 32, thereby extending the service life of the first sealing ring 33 and reducing the probability of sealing failure in the mechanical sealing device, which is conducive to ensuring the stable operation of the material pumping system and providing protection for the continuous production.

[0049] like Figure 1 As shown, in some feasible examples, the dynamic ring assembly 10 may include a dynamic ring body 11, a dynamic ring seat 12, a dynamic ring sealing ring 13, a dynamic ring retaining ring 14 and a dynamic ring transmission pin 15, wherein the dynamic ring seat 12 can be used to be sleeved on the rotating shaft of the aforementioned conveying pump, the dynamic ring body 11 is formed with the aforementioned first sealing end and is arranged on the dynamic ring seat 12, the dynamic ring retaining ring 14 is used to limit the position between the dynamic ring seat 12 and the dynamic ring body 11, the dynamic ring sealing ring 13 is used to seal the fitting gap between the dynamic ring seat 12 and the dynamic ring body 11, and the dynamic ring transmission pin 15 is connected between the dynamic ring body 11 and the dynamic ring seat 12.

[0050] like Figure 1 As shown, in some feasible examples, the mechanical seal device may further include a sleeve 50, and the stationary ring assembly 20 may include a stationary ring body 21 and a stationary ring seat 22, wherein the sleeve 50 is used to be sleeved on the rotating shaft of the delivery pump, the stationary ring seat 22 is sleeved on the sleeve 50, the stationary ring body 21 is formed with the aforementioned second sealing end and is disposed on the stationary ring seat 22; the aforementioned flange portion 32 is sleeved on the stationary ring seat 22, and the first sealing ring 33 is sleeved between the stationary ring seat 22 and the flange portion 32. Accordingly, the shielding assembly 40 may be connected to the stationary ring seat 22.

[0051] like Figure 1 and Figure 2 As shown, in some examples, the shielding assembly 40 includes: a shielding sleeve 41, which is mounted on the stationary ring assembly 20, the shielding sleeve 41 is made of a flexible material, the first connection end of the shielding sleeve 41 is fixedly connected to the stationary ring assembly 20, and the second connection end of the shielding sleeve 41 is fixedly connected to the flange portion 32 close to one end of the dynamic ring assembly 10.

[0052] In this technical solution, the shielding assembly 40 may include the aforementioned shielding sleeve 41, which may be located between the first sealing end and the end of the flange portion 32 close to the dynamic ring assembly 10, and shield the matching gap between the flange portion 32 and the static ring assembly 20. During the material conveying process, the risk of material infiltration into the matching gap between the flange portion 32 and the static ring assembly 20 can be reduced, the wear of the first sealing ring 33 can be reduced, the service life of the first sealing ring 33 can be extended, and the probability of sealing failure of the mechanical sealing device can be reduced; and the shielding sleeve 41 may be made of a flexible material. This makes it easier for the shielding sleeve 41 to deform during use. By fixing the two ends of the shielding sleeve 41 to the stationary ring assembly 20 and the flange portion 32 respectively, the shielding sleeve 41 can produce telescopic deformation in the corresponding direction when it moves between the stationary ring assembly 20 and the flange portion 32 along the arrangement direction of the dynamic ring assembly 10 and the stationary ring assembly 20. This enables the mechanical sealing device to use the shielding assembly 40 to protect the first sealing ring 33 while reducing the influence of the setting of the shielding assembly 40 on the coordination between the dynamic ring assembly 10, the stationary ring assembly 20 and the clamping assembly 30.

[0053] like Figure 1 As shown, in some examples, the shielding assembly 40 further includes: a clamp 42, which is sleeved on the shielding sleeve 41 and arranged close to the first connection end, and the clamp 42 has a first connection hole; and a first fastener 43, which passes through the first connection hole and is connected to the stationary ring assembly 20.

[0054] In this technical solution, one end of the shielding sleeve 41 connected to the static ring assembly 20 can be fixed by the aforementioned clamp 42 and the first fastener 43, thereby reducing the risk of the shielding sleeve 41 detaching from the static ring assembly 20 and facilitating improving the sealing performance of the connection between the shielding sleeve 41 and the static ring assembly 20.

[0055] It is understandable that the aforementioned first fastener 43 can be, but is not limited to, fasteners such as bolts, screws, and rivets.

[0056] It can be understood that the first connecting end can be interference fit with the static ring assembly 20; and the clamp 42 can be interference fit with the shielding sleeve 41.

[0057] like Figure 1 As shown, in some examples, the shielding assembly 40 also includes: a pressure plate 44, which is arranged on the shielding sleeve 41, the second connection end is located between the pressure plate 44 and the flange portion 32, and the pressure plate 44 has a second connection hole; a second fastener 45, which passes through the second connection hole and is connected to the flange portion 32.

[0058] In this technical solution, one end of the shielding sleeve 41 connected to the flange part 32 can be fixed by the aforementioned pressure plate 44 and the second fastener 45, thereby reducing the risk of the shielding sleeve 41 detaching from the flange part 32 and facilitating improving the sealing performance of the connection between the shielding sleeve 41 and the flange part 32.

[0059] It is understood that the second fastener 45 may be, but is not limited to, a bolt, a screw, a rivet, or other fasteners. For example, the second fastener 45 may be a countersunk screw.

[0060] In some examples, the shielding sleeve 41 is made of a rubber material.

[0061] In this technical solution, the aforementioned shielding sleeve 41 can be made of rubber material, so that while ensuring the shielding sleeve 41 has good flexibility, the shielding sleeve 41 also has good corrosion resistance and wear resistance, which is conducive to extending the service life of the shielding sleeve 41.

[0062] For example, the shielding sleeve 41 may be made of, but not limited to, fluororubber, silicone rubber, or nitrile rubber. It is understood that in practical applications, the rubber material for the shielding sleeve 41 may be selected based on the type of material being pumped by the material pumping system. The specific material of the shielding sleeve 41 is not specifically limited herein.

[0063] In some examples, a receiving cavity 401 is formed between the shielding sleeve 41 , the flange portion 32 and the stationary ring assembly 20 , and the receiving cavity 401 is used to accommodate grease.

[0064] In this technical solution, a accommodating cavity 401 for accommodating grease can be formed between the shielding sleeve 41, the flange portion 32 and the stationary ring assembly 20. It can be understood that the aforementioned grease can be injected during the assembly of the mechanical sealing device; based on this, on the one hand, it can further facilitate the deformation of the shielding sleeve 41, and then adapt to the movement between the flange portion 32 and the stationary ring assembly 20; on the other hand, it can also facilitate the use of grease to lubricate the stationary ring assembly 20, the flange portion 32 and the first sealing ring 33, reduce the wear of the corresponding components, and provide further protection for the sealing effect and service life of the mechanical sealing device.

[0065] It is understood that the type of the aforementioned grease can be selected in accordance with actual needs and is not limited here. For example, the aforementioned grease can be a high temperature resistant grease.

[0066] like Figure 1 As shown, in some examples, the mechanical sealing device further includes: a second sealing ring 60 sleeved on the flange portion 32 .

[0067] In this technical solution, the mechanical sealing device also includes a second sealing ring 60 mounted on the flange portion 32. In actual application, the outer peripheral side of the flange portion 32 can be sealed and connected to the mechanical inner side of the conveying pump through the second sealing ring 60, thereby further preventing the material from penetrating toward the clamping assembly 30 and helping to improve the stability of the flange portion 32 and the static ring assembly 20.

[0068] In some examples, the mechanical sealing device further includes: a third sealing ring 70 disposed at an end of the dynamic ring assembly 10 away from the static ring assembly 20 .

[0069] In this technical solution, the mechanical sealing device also includes a third sealing ring 70 arranged on the dynamic ring assembly 10, and the third sealing ring 70 is located at one end of the dynamic ring assembly 10 away from the static ring assembly 20. In actual application, the dynamic ring assembly 10 can be sealed and connected to the impeller of the conveying pump through the third sealing ring 70, thereby improving the sealing between the dynamic ring assembly 10 and the impeller, providing further guarantee for the smooth operation of the conveying pump.

[0070] like Figure 1 As shown, in some examples, the clamping portion 31 includes: a first limit member 311; a second limit member 312, which abuts against one end of the stationary ring assembly 20 away from the dynamic ring assembly 10, and the flange portion 32 is fixedly connected to the first limit member 311; and an elastic member 313, which is connected between the first limit member 311 and the second limit member 312.

[0071] In this technical solution, the clamping part 31 can contact the aforementioned stationary ring assembly 20 through the second limiting member 312, and can use the elastic force generated by the elastic member 313 to provide the stationary ring assembly 20 with a force toward the dynamic ring assembly 10, thereby ensuring the tightness of the fit between the first sealing end and the second sealing end, and ensuring the sealing effect of the mechanical sealing device; at the same time, by setting the flange part 32 fixedly connected to the first limiting member 311, the structural constraint between the flange part 32 and the clamping part 31 can be enhanced, and the positional stability and reliability of the flange part 32 and the clamping part 31 can be improved, providing a more reliable guarantee for the sealing effect, and facilitating the second limiting member 312 to apply a force toward the dynamic ring assembly 10 to the stationary ring assembly 20.

[0072] like Figure 1As shown, in some feasible examples, the clamping assembly 30 may also include a first anti-rotation pin 34, a first screw 35, a second screw 36, a flange positioning plate 37 and a second anti-rotation pin 38; wherein the first anti-rotation pin 34 is arranged on the flange portion 32 and is used to limit the rotation of the flange portion 32 relative to the housing of the delivery pump; the flange positioning plate 37 is arranged at the end of the flange portion 32 away from the dynamic ring assembly 10 and is used to clamp the housing of the delivery pump, and the first screw 35 passes through the flange positioning plate 37 to be connected to the flange portion 32; the second screw 36 is passed through the first limiting member 311 and connected to the flange portion 32, so that the flange portion 32 can be fixedly connected to the first limiting member 311 by the second screw 36; the second anti-rotation pin 38 is passed through the second limiting member 312, the flange portion 32 and the stationary ring assembly 20, thereby limiting the relative rotation between the second limiting member 312, the flange portion 32 and the stationary ring assembly 20; based on this, the position stability and positioning accuracy of the flange portion 32, the clamping portion 31 and the stationary ring assembly can be further improved.

[0073] Exemplarily, the first screw 35 may be a hexagon socket head screw.

[0074] According to a second aspect of an embodiment of the present disclosure, a material pumping system is proposed, comprising: a mechanical sealing device as proposed in any one of the first aspects above.

[0075] It can be understood that the material pumping system provided by the embodiment of the present disclosure may further include a delivery pump, and the aforementioned mechanical sealing device may be arranged on the positioning shaft of the aforementioned delivery pump.

[0076] In addition, since the material pumping system provided by the embodiment of the present disclosure includes the mechanical sealing device proposed in any one of the first aspects above, it has all the beneficial effects of the mechanical sealing device, which will not be described in detail here.

[0077] In the present disclosure, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0078] In the description of the present disclosure, it is to be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, cannot be understood as a limitation on the present disclosure.

[0079] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0080] The above are merely preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations of the present disclosure are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. A mechanical sealing device, characterized in that: include: A dynamic ring assembly having a first sealing end; a stationary ring assembly having a second sealing end, the second sealing end abutting against the first sealing end; A clamping assembly, comprising a clamping portion, a flange portion, and a first sealing ring, wherein the clamping portion abuts against an end of the stationary ring assembly away from the dynamic ring assembly, the flange portion is sleeved on the stationary ring assembly, and the first sealing ring is disposed between the stationary ring assembly and the flange portion; a shielding assembly, sleeved on the static ring assembly, with two ends of the shielding assembly respectively connected to one end of the flange portion close to the dynamic ring assembly and the static ring assembly; Wherein, the shielding assembly is suitable for extending and retracting along the arrangement direction of the dynamic ring assembly and the static ring assembly.

2. The mechanical sealing device according to claim 1, characterized in that: The shielding assembly comprises: A shielding sleeve is mounted on the stationary ring assembly. The shielding sleeve is made of a flexible material. A first connecting end of the shielding sleeve is fixedly connected to the stationary ring assembly. A second connecting end of the shielding sleeve is fixedly connected to an end of the flange portion close to the dynamic ring assembly.

3. The mechanical sealing device according to claim 2, characterized in that: The shielding assembly further comprises: a clamp, sleeved on the shielding sleeve and arranged close to the first connecting end, the clamp having a first connecting hole; A first fastener passes through the first connecting hole and is connected to the stationary ring assembly.

4. The mechanical sealing device according to claim 2, characterized in that: The shielding assembly further comprises: A pressing plate is provided on the shielding sleeve, the second connecting end is located between the pressing plate and the flange portion, and the pressing plate is provided with a second connecting hole; A second fastener passes through the second connecting hole and is connected to the flange portion.

5. The mechanical sealing device according to claim 2, characterized in that: The shielding sleeve is made of rubber material.

6. The mechanical sealing device according to any one of claims 1 to 5, characterized in that: An accommodating cavity is formed between the shielding sleeve, the flange portion and the stationary ring assembly, and the accommodating cavity is used to accommodate grease.

7. The mechanical sealing device according to any one of claims 1 to 5, characterized in that: Also includes: The second sealing ring is sleeved on the flange portion.

8. The mechanical sealing device according to any one of claims 1 to 5, characterized in that: Also includes: The third sealing ring is arranged at one end of the dynamic ring assembly away from the static ring assembly.

9. The mechanical sealing device according to any one of claims 1 to 5, characterized in that: The pressing portion includes: a first limiting member; a second limiting member abutting against one end of the stationary ring assembly away from the dynamic ring assembly, and the flange portion being fixedly connected to the first limiting member; An elastic member is connected between the first limiting member and the second limiting member.

10. A material pumping system, characterized in that: include: The mechanical seal device according to any one of claims 1 to 9.

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