Combined sealing device for rotating shaft

Abstract

The utility model relates to a rotating shaft combined sealing device which is installed on a rotating shaft of a stirring device, the sealing device comprises a rolling bearing, a sealing ring, an outer ring and an inner ring, the rotating shaft is rotatably installed on a shell of the stirring device through the rolling bearing, the sealing ring is arranged on the rotating shaft in a sleeving mode, the inner ring is fixedly arranged on the rotating shaft in a sleeving mode, and the outer ring and the inner ring are arranged in a sleeving mode. The inner ring is sleeved with the outer ring, the outer ring and the sealing ring are installed between the inner ring and the rolling bearing, a sealing component is arranged on the inner side wall of the sealing ring, protruding lines are arranged on the portion, on the inner side of the sealing component, of the rotating shaft, and a gap for airflow to pass through is formed between the sealing component and the protruding lines. An annular space is formed between the outer ring and the inner ring, and a through hole is formed in the outer ring and communicated with the annular space. According to the sealing device, the rotating shaft is sealed in a combined mode through the annular body composed of the inner ring and the outer ring and the sealing ring, and the sealing effect is good.

Description

Technical Field

[0001] The present application relates to the technology of rotating shaft sealing, and particularly to a combined sealing device for a rotating shaft. Background Art

[0002] A stirring device is a common rotating machine. Its structural form is to pivot a transmission mechanism on a reaction tank to drive a stirring shaft, and then drive stirring blades to stir the liquid fluid raw materials in a containing tank. During the stirring process, there is also a reaction pressure inside, and usually a shaft seal device is provided to seal the pivoting part of the stirring shaft to prevent the fluid or gas pressure in the reaction tank from leaking out from the pivoting part.

[0003] Mechanical seal is a common sealing method with good tightness. However, when the stirring device is running, the shaft component will generate high-frequency vibration in the radial direction. The load imposed on the mechanical seal structure by this vibration is inevitable. In the prior art, a buffer element is added to reduce the actual pressure borne by the mechanical seal. However, because the mechanical seal structure needs to directly contact the shaft component, wear cannot be completely eliminated and will exist for a long time. This makes regular maintenance of the mechanical seal necessary. During regular maintenance, generally, the entire component needs to be removed to replace the dynamic ring and / or static ring. It is necessary to shut down the equipment and use special tools to successively disassemble each part of the shaft end seal, replace the failed parts, and then successively install the parts of the shaft end seal. If a too complex mechanical seal is used, it is not convenient for disassembly and replacement, and a large amount of additional replacement time is required. The long maintenance cycle and the large installation difficulty result in poor production efficiency. Summary of the Utility Model

[0004] In order to overcome the above defects, the present application provides a combined sealing device for a rotating shaft. In this sealing device, a ring body composed of an inner ring and an outer ring and a sealing ring are used to perform combined sealing on the rotating shaft, with good sealing effect, easy installation and disassembly, shortened maintenance time, improved production efficiency, and reduced production cost.

[0005] The technical solution adopted by the present application to solve its technical problems is:

[0006] A combined rotating shaft sealing device is installed on the rotating shaft of a stirring device. The sealing device includes a rolling bearing, a sealing ring, an outer ring, and an inner ring. The rotating shaft is rotatably installed on the housing of the stirring device through the rolling bearing. The sealing ring is sleeved on the rotating shaft. The inner ring is fixedly sleeved on the rotating shaft. The outer ring is sleeved on the inner ring. The outer ring and the sealing ring are installed between the inner ring and the rolling bearing. A sealing member is provided on the inner side wall of the sealing ring. A protruding texture is provided on the rotating shaft inside the sealing member. A gap for air flow to pass through is formed between the sealing member and the protruding texture. An annular space is provided between the outer ring and the inner ring. A through hole is provided on the outer ring, and the through hole communicates with the annular space.

[0007] Optionally, the inner ring is fixedly screwed to the rotating shaft. The outer ring includes a bottom plate and a side plate fixedly connected to the bottom plate. The inner ring abuts against the bottom plate. The bottom plate abuts against the first end of the sealing ring. The second end of the sealing ring abuts against the rolling bearing.

[0008] Optionally, a central hole is provided on the bottom plate. The rotating shaft passes through the central hole. The through hole is provided on the side plate.

[0009] Optionally, the inner ring includes a first cylinder and a second cylinder. The second cylinder is fixedly screwed to the rotating shaft. The first cylinder is fixedly sleeved on the second cylinder. The outer ring is located outside the first cylinder. An annular space is formed between the outer ring and the first cylinder.

[0010] Optionally, both the first cylinder and the second cylinder are of a cylindrical structure. The outer diameter of the first cylinder is greater than the outer diameter of the second cylinder. The outer radius of the first cylinder is R1, and the inner radius of the outer ring is R2, where R2 > R1.

[0011] Optionally, the sealing member includes a plurality of comb teeth arranged at intervals. An arc-shaped flow channel is provided between adjacent two comb teeth.

[0012] Optionally, the width of the comb teeth is H, and H is 0.3 - 0.8 mm.

[0013] Optionally, the protruding texture is in a wavy structure. A gap is provided between the protruding texture and the comb teeth.

[0014] Optionally, the sealing ring is a sealing ring made of a metal material.

[0015] The beneficial effects of this application are:

[0016] (1) In the present application, the sealing ring, the sealing component of the sealing ring and the protruding patterns on the rotating shaft can effectively prevent the leakage of fine droplets or powder particles that are not completely wetted in the stirring device, and the gap between the sealing component and the protruding patterns is used to enhance the vortex flow and promote mass exchange, thereby achieving a better sealing effect.

[0017] (2) When a large temperature difference is formed between the inside of the stirring device and the room temperature or when the temperature and humidity outside the stirring device reach certain conditions, liquid droplets such as water droplets may be generated. When water droplets and other foreign objects accidentally invade the annular space between the inner ring and the outer ring along the outer circumferential surface of the shaft component, the inner ring rotates with the rotating shaft and the centrifugal force generated by the inner ring causes the foreign objects to be detached from the rotating shaft and discharged through the through holes on the outer ring, thereby avoiding contamination by liquid droplets and foreign objects.

[0018] (3) Since the inner ring can be removed from the rotating shaft, the outer ring can be easily removed from the rotating shaft, so the inner ring and the outer ring are easy to install and disassemble, and the structure is simple and the maintenance cost is low.

[0019] (4) In the present application, a ring-shaped body composed of an inner ring and an outer ring and a sealing ring are used to perform a combined seal on the rotating shaft. A preliminary airtight effect is achieved through a labyrinth seal formed by a sealing component and protruding patterns to prevent leakage of materials inside the stirring device. At the same time, a good mechanical seal is achieved through a mechanical sealing mechanism composed of an inner ring and an outer ring, which effectively prevents the invasion of external foreign matter. The mechanical sealing mechanism has a simple structure and is easy to disassemble and install, which shortens maintenance time, improves production efficiency, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the sealing device in this application;

[0021] Figure 2 A top view of the sealing device in this application;

[0022] Figure 3 It is a partial structural diagram of the sealing device in this application;

[0023] Figure 4 This is a schematic diagram of the structure of the outer ring in this application;

[0024] In the figure: 10-rolling bearing, 20-sealing ring, 21-sealing member, 22-comb teeth, 23-flow channel, 24-gap, 30-outer ring, 31-bottom plate, 32-side plate, 33-through hole, 34-annular space, 35-center hole, 40-inner ring, 41-first cylinder, 42-second cylinder, 50-housing, 60-rotating shaft, 61-protruding texture. DETAILED DESCRIPTION

[0025] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the objects so used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] For the sake of description, spatial relative terms such as "above...", "on top of...", "on the upper surface of...", "above" and the like can be used here to describe the spatial position relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation shown in the figures. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "on top of other devices or structures" will then be positioned as "below other devices or structures" or "beneath other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0028] Embodiment: As Figures 1-4As shown in the figure, a combined seal device for a rotating shaft is installed on the rotating shaft 60 of a stirring device. The seal device includes a rolling bearing 10, a sealing ring 20, an outer ring 30 and an inner ring 40. The rotating shaft 60 is rotatably installed on the housing 50 of the stirring device through the rolling bearing 10. The sealing ring 20 is sleeved on the rotating shaft 60. The inner ring 40 is fixedly sleeved on the rotating shaft 60. The outer ring 30 is sleeved on the inner ring 40. The outer ring 30 and the sealing ring 20 are installed between the inner ring 40 and the rolling bearing 10. That is, when the inner ring 40 is fixed to the rotating shaft 60, the outer ring 30 and the sealing ring 20 are clamped between the inner ring 40 and the rolling bearing 10, so that the outer ring 30 and the sealing ring 20 are axially fixedly installed on the rotating shaft 60. A sealing member 21 is provided on the inner side wall of the sealing ring 20. A raised texture 61 is provided on the rotating shaft 60 inside the sealing member 21. A gap 24 for air flow is formed between the sealing member 21 and the raised texture 61. An annular space 34 is provided between the outer ring 30 and the inner ring 40. A through hole 33 is provided on the outer ring 30. The through hole 33 communicates with the annular space 34.

[0029] In this application, the sealing ring 20, the sealing member 21 of the sealing ring 20 and the raised texture 61 on the rotating shaft 60 can effectively prevent the leakage of fine liquid droplets or incompletely wetted powder particles in the stirring device. And by using the gap 24 between the sealing member 21 and the raised texture 61, the vortex flow is strengthened and the mass exchange is promoted, so as to achieve a better sealing effect. When there is a large temperature difference between the inside of the stirring device and the room temperature or when the temperature and humidity outside the stirring device reach certain conditions, liquid droplet foreign matters such as water droplets may be generated. In the case where foreign matters such as water droplets accidentally invade the annular space 34 between the inner ring 40 and the outer ring 30 along the outer peripheral surface of the shaft component, the inner ring 40 rotates with the rotating shaft 60 and the centrifugal force generated by it causes the foreign matters to break away from the rotating shaft 60 and be discharged through the through hole 33 on the outer ring 30, thus avoiding the pollution of liquid droplet foreign matters. Since the inner ring 40 can be disassembled from the rotating shaft 60 and the outer ring 30 can be easily removed from the rotating shaft 60, the inner ring and the outer ring are easy to install and disassemble, and have a simple structure and low maintenance cost.

[0030] In this application, a combined seal for the rotating shaft is formed by using the annular body composed of the inner ring and the outer ring and the sealing ring. The labyrinth seal formed by the sealing member and the raised texture is used to achieve a preliminary airtight effect to prevent the leakage of the internal materials of the stirring device. At the same time, a good mechanical seal is achieved through the mechanical seal mechanism composed of the inner ring and the outer ring, effectively preventing the invasion of external foreign matters. And the mechanical seal mechanism has a simple structure, is easy to disassemble and install, shortens the maintenance time, improves the production efficiency and reduces the production cost.

[0031] As Figure 1 andFigure 4 As shown, the inner ring 40 is screwed and fixed on the rotating shaft 60. The outer ring 30 includes a bottom plate 31 and a side plate 32 fixedly connected to the bottom plate 31. The inner ring 40 abuts against the bottom plate 31. The bottom plate 31 abuts against the first end of the sealing ring 20. The second end of the sealing ring 20 abuts against the rolling bearing 10. The inner side wall of the inner ring 40 is provided with an internal thread, and a section of external thread is provided on the rotating shaft 60. The inner ring 40 is screwed onto the rotating shaft 60 through the internal thread and the external thread, and the axial position of the inner ring 40 on the rotating shaft 60 can be adjusted through the internal thread and the external thread to loosen and lock the outer ring 30 and the sealing ring 20.

[0032] As Figure 1 shown, taking the housing 50 as a reference, from near to far are the rolling bearing 10, the sealing ring 20, the outer ring 30 and the inner ring 40 in sequence. The lower end of the inner ring 40 abuts against the outer ring 30. The lower end of the outer ring 30 abuts against the sealing ring 20. The lower end of the sealing ring 20 abuts against the rolling bearing 10.

[0033] As Figure 1 and Figure 4 shown, a central hole 35 is provided on the bottom plate 31. The rotating shaft 60 passes through the central hole 35, and through holes 33 are provided on the side plate 32. Optionally, the distances between adjacent through holes 33 are equal. In this embodiment, the side plate 32 encloses a cylindrical structure with upper and lower openings and a hollow interior. The lower opening end of the side plate 32 is connected to the bottom plate 31, that is, the outer ring 30 is integrally in a cylindrical structure. After assembly, the bottom plate 31 abuts against the sealing ring 20.

[0034] As Figure 1 shown, the inner ring 40 includes a first cylinder 41 and a second cylinder 42. The second cylinder 42 is screwed and fixed on the rotating shaft 60. The first cylinder 41 is fixedly sleeved on the second cylinder 42. The outer ring 30 is located outside the first cylinder 41, and an annular space 34 is formed between the outer ring 30 and the first cylinder 41.

[0035] As Figure 1 and Figure 2As shown, the first cylinder 41 and the second cylinder 42 are both cylindrical structures, the outer diameter of the first cylinder 41 is greater than the outer diameter of the second cylinder 42, the outer radius of the first cylinder 41 is R1, and the inner radius of the outer ring 30 is R2, wherein R2>R1. That is, an annular space 34 is formed between the outer ring 30 and the first cylinder 41. When foreign matter such as water droplets accidentally intrudes into the annular space 34 along the outer circumferential surface of the shaft component, the inner ring 40 rotates with the rotating shaft 60 and the foreign matter is separated from the rotating shaft 60 by the centrifugal force generated by the inner ring 40, and discharged through the multiple through holes 33 on the outer ring 30. The through holes 33 shear and discharge the foreign matter, preventing a large amount of foreign matter from accumulating in the annular space 34, and avoiding the contamination of droplets and foreign matter.

[0036] like Figure 1 and Figure 3 As shown, the sealing member 21 includes a plurality of comb teeth 22 arranged at intervals, and an arc-shaped flow channel 23 is provided between two adjacent comb teeth 22. A plurality of tightly arranged sealing members 21 are provided in the circumferential direction of the sealing ring 20, and each sealing member 21 is arranged along the axial direction of the sealing ring 20. Each sealing member 21 includes a plurality of comb teeth 22 and a flow channel 23 between the comb teeth 22, and a gap 24 is provided between the end of the comb teeth 22 and the protruding lines 61. Figure 3 The arrows in the figure indicate the direction of gas flow.

[0037] The sealing components 21 are closely arranged, ensuring a certain amount of air leakage while preventing material leakage. When the stirring device is running, the gas passes through the toothed sealing components 21, the air flow speed is accelerated, and a pressure drop is generated to balance the pressure difference before and after the seal to achieve the sealing purpose. The arc-shaped inter-tooth flow channel 23 forms a reflux flow area, which strengthens the vortex flow and promotes mass exchange, thereby achieving a better sealing effect.

[0038] like Figure 3 As shown, the width of the comb teeth 22 is H, and H is 0.3-0.8mm. The protruding lines 61 are in a wavy structure, and there is a gap 24 between the protruding lines 61 and the comb teeth 22. In order to ensure a certain amount of air leakage without losing air tightness, the sealing member 21 in the sealing ring 20 can be arranged in multiple layers, and the area between the tooth gaps of the sealing member 21 is controlled within a certain range, thereby achieving a good sealing effect. Optionally, the sealing member 21 is evenly distributed on the circumferential surface inside the sealing ring 20, and the width H of the comb teeth 22 in the axial direction of the rotating shaft 60 is 0.3-0.8mm. In a possible embodiment, H is 0.4mm, and the protruding lines 61 on the rotating shaft 60 correspond to the position of the sealing member 21, and the gap 24 formed by the two close to each other constitutes a tortuous flow channel. The tortuous gas flow channel can prevent the material in the stirring device from causing a large amount of dust to rush out of the device due to the reduction of the shaft end pressure.

[0039] The sealing ring 20 is a sealing ring made of metal material. The wear of the non-contact sealing method is negligible. Therefore, there is no need to consider the material loss problem that may be caused by using a metal sealing ring, and using a metal sealing ring can avoid the deformation problem of the sealing ring caused by thermal expansion, increasing the service life.

[0040] Optionally, when the stirring device starts to operate, to ensure that the temperature in the reaction kettle reaches the reaction requirements and remains stable, the temperature in the housing 50 of the stirring device is kept constant through the temperature control jacket and the hollow temperature control medium channel in the rotating shaft 60. At this time, because there is a large temperature difference from the room temperature or when the humidity and temperature outside the device reach certain conditions due to external factors, condensate droplets may form on the rotating shaft 60. If such foreign objects enter the inside of the stirring device, it is not conducive to the formation of a solvent-based pigment dispersion, which will directly affect the dispersibility and other properties of the product.

[0041] In the case where foreign objects such as condensate droplets accidentally invade the annular space 34 between the inner ring 40 and the outer ring 30 along the outer peripheral surface of the shaft member, the inner ring 40 rotates with the rotating shaft 60 and uses the centrifugal force generated by it to separate the foreign objects from the rotating shaft 60, and discharges them through the through holes 33 on the outer ring 30. An oil-based substance can be used between the sealing ring 20 and the outer ring 30 to achieve the effect of separating oil and water, further preventing the possibility of droplets entering the device interior. The outer ring 30 can also be removed from the rotating shaft 60 by disassembling the inner ring 40. When the sealing device has reached a certain operating time, the sealing components need to be replaced. The outer ring 30 and the inner ring 40 are easy to install and disassemble, and have a simple structure, with low maintenance costs.

[0042] It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several deformations and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application shall be subject to the appended claims.

Claims

1. A combined rotary shaft sealing device is installed on the rotary shaft (60) of a stirring device, and is characterized in that: The sealing device includes a rolling bearing (10), a sealing ring (20), an outer ring (30) and an inner ring (40). The rotating shaft (60) is rotatably mounted on the housing (50) of the stirring device through the rolling bearing (10). The sealing ring (20) is sleeved on the rotating shaft (60). The inner ring (40) is fixedly sleeved on the rotating shaft (60). The outer ring (30) is sleeved on the inner ring (40). The outer ring (30) and the sealing ring (20) are installed between the inner ring (40) and the rolling bearing (10). A sealing member (21) is provided on the inner side wall of the sealing ring (20). A protruding texture (61) is provided on the rotating shaft (60) inside the sealing member (21). A gap (24) for air flow to pass through is formed between the sealing member (21) and the protruding texture (61). An annular space (34) is provided between the outer ring (30) and the inner ring (40). A through hole (33) is provided on the outer ring (30), and the through hole (33) communicates with the annular space (34).

2. The rotating shaft combined sealing device according to claim 1, characterized in that: The inner ring (40) is fixedly screwed to the rotating shaft (60). The outer ring (30) includes a bottom plate (31) and a side plate (32) fixedly connected to the bottom plate (31). The inner ring (40) abuts against the bottom plate (31). The bottom plate (31) abuts against the first end of the sealing ring (20). The second end of the sealing ring (20) abuts against the rolling bearing (10).

3. The rotating shaft combined sealing device according to claim 2, characterized in that: A central hole (35) is provided on the bottom plate (31). The rotating shaft (60) passes through the central hole (35). The through hole (33) is provided on the side plate (32).

4. The rotating shaft combined sealing device according to claim 1, wherein: The inner ring (40) includes a first cylinder (41) and a second cylinder (42). The second cylinder (42) is fixedly screwed to the rotating shaft (60). The first cylinder (41) is fixedly sleeved on the second cylinder (42). The outer ring (30) is located outside the first cylinder (41). The annular space (34) is formed between the outer ring (30) and the first cylinder (41).

5. The rotating shaft combined sealing device according to claim 4, characterized in that: Both the first cylinder (41) and the second cylinder (42) are of a cylindrical structure. The outer diameter of the first cylinder (41) is greater than the outer diameter of the second cylinder (42). The outer radius of the first cylinder (41) is R1, and the inner radius of the outer ring (30) is R2. Wherein, R2 > R1.

6. The combined rotating shaft sealing device according to claim 1, characterized in that: The sealing member (21) includes a plurality of comb teeth (22) arranged at intervals. An arc-shaped flow channel (23) is provided between two adjacent comb teeth (22).

7. The rotating shaft combined sealing device according to claim 6, characterized in that: The width of the comb teeth (22) is H, and H is 0.3 - 0.8 mm.

8. The rotating shaft combined sealing device according to claim 6, wherein: The protruding texture (61) is of a wavy structure. A gap (24) is provided between the protruding texture (61) and the comb teeth (22).

9. The combined seal device for a rotating shaft according to claim 1, characterized in that: The sealing ring (20) is a sealing ring made of a metal material.

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