Sealing structure for rotating shaft in powder environment

Abstract

The utility model relates to the field of rotating shaft sealing, and discloses a sealing structure for a rotating shaft in a powder environment, which comprises a dust chamber, an oil seal mounting pad is arranged on the left side of the dust chamber, a fixed seat is fixedly connected to the left side of the oil seal mounting pad, a sealing assembly is arranged on the left side of the fixed seat, and the sealing assembly comprises a mounted bearing. The right side of the mounted bearing is fixedly connected to the left side of the fixing seat, a rotating shaft is arranged on the inner wall of the mounted bearing, and a first oil seal is fixedly connected to the inner wall of the left side of the fixing seat. According to the utility model, through the cooperative use of the fixed seat, the sealing assembly and the dust chamber, when the equipment works, airflow enters the closed cavity formed by the oil seals on the two sides from the air pipe on the rear side, so that a small amount of dust permeating from the oil seal on the right side is continuously blown away; and the blown dust returns to the right dust chamber along the front one-way air pipe joint and the guide pipe, and the process is continuously circulated, so that the purpose of preventing dust leakage is achieved.

Description

Technical Field

[0001] The utility model relates to the field of rotary shaft seals, in particular to a sealing structure for a rotary shaft in a powder environment. Background Art

[0002] In many industrial production fields, such as chemical industry, building materials, food processing, etc., the handling and conveying of powders are common operating links. In these processes, the rotary shaft is widely used as a key power transmission and moving component.

[0003] The rotary seal of dust is different from that of liquid. The rotary seal of liquid is based on the lubrication theory of sliding. The key to maintaining the rotary seal is that as long as the oil film between the oil seal lip and the shaft surface is not damaged due to excessive pressure and too fast shaft rotation speed.

[0004] In a dust environment, dust has the characteristics of continuous accumulation and gradual extrusion on the contact surface, so it will cause the situation of powder leakage from the oil seal due to continuous accumulation and extrusion in a short time. Therefore, a sealing structure for a rotary shaft in a powder environment is proposed to solve the above problems. Summary of the Utility Model

[0005] In order to make up for the above deficiencies, the utility model provides a sealing structure for a rotary shaft in a powder environment, aiming to improve the problem of "powder leakage from the oil seal due to continuous accumulation and extrusion in a short time" in the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: A sealing structure for a rotary shaft in a powder environment, including a dust chamber, an oil seal mounting pad is arranged on the left side of the dust chamber, a fixed seat is fixedly connected to the left side of the oil seal mounting pad, a sealing component is arranged on the left side of the fixed seat, the sealing component includes a pillow block bearing, the right side of the pillow block bearing is fixedly connected to the left side of the fixed seat, a rotary shaft is arranged on the inner wall of the pillow block bearing, an oil seal one is fixedly connected to the left inner wall of the fixed seat, the inner side of the oil seal one rotates on the outer side of the rotary shaft, an oil seal gland one is clamped on the left inner wall of the oil seal one, and the right side of the oil seal gland one is fixedly connected to the left side of the oil seal mounting pad.

[0007] As a further description of the above technical scheme:

[0008] An oil seal two is arranged on the right inner wall of the oil seal mounting pad, the inner side of the oil seal two rotates on the outer side of the rotary shaft, an oil seal gland two is clamped on the right side of the oil seal two, the outer left part of the oil seal gland two is fixedly connected to the right side of the oil seal mounting pad, and a one-way connector is fixedly connected through the rear side of the oil seal mounting pad.

[0009] As a further description of the above technical scheme:

[0010] There are multiple groups of the one-way connectors, which are respectively arranged on the front side of the oil seal mounting pad and the left side of the dust chamber. A trachea is fixedly connected to the rear side of the one-way connector. A conduit is fixedly connected to the front end of one group of one-way connectors on the front side of the oil seal mounting pad, and the right side of the upper end of the conduit is fixedly connected to the left side of one group of one-way connectors on the left side of the dust chamber.

[0011] As a further description of the above technical solution:

[0012] The second oil seal and the first oil seal form a sealed cavity between the inner side of the oil seal mounting pad and the outer side of the rotating shaft.

[0013] As a further description of the above technical solution:

[0014] A protection component is arranged on the left side of the pedestal bearing. The protection component includes a limit ring. The inner side of the limit ring is fixedly connected to the outer side of the left end of the pedestal bearing. A turntable is slidably connected to the outer wall of the limit ring. The right side of the turntable is attached to the left side of the pedestal bearing. A pull rod is slidably connected through the upper inner wall of the turntable.

[0015] As a further description of the above technical solution:

[0016] The right side of the pull rod is rotatably connected to a moving plate. The left side of the moving plate is elastically connected to the turntable through a compression spring. Threaded ridges are arranged on the outer side of the pull rod close to the moving plate.

[0017] As a further description of the above technical solution:

[0018] Threaded grooves are formed in the sliding part of the outer side of the pull rod and the turntable, and the outer wall of the threaded ridges rotates and slides on the inner wall of the threaded grooves.

[0019] As a further description of the above technical solution:

[0020] The outer wall of the moving plate slides in the inner wall of the mounting hole on the pedestal bearing.

[0021] The utility model has the following beneficial effects:

[0022] 1. In the utility model, through the combined use of the fixed seat, the sealing component and the dust chamber, when the equipment is working, air flow enters the sealed cavity formed by the two oil seals on both sides from the rear trachea, continuously blows away a little dust that has penetrated through the right oil seal in the right dust chamber, and the blown-away dust returns to the right dust chamber along the front one-way trachea joint and the conduit, and circulates continuously like this, so as to achieve the purpose of preventing dust leakage.

[0023] 2. In the present utility model, through the combined use of the protection component and the pillow block bearing, after the pillow block bearing is installed, the outer side of the installed pillow block bearing can be protected through the turntable, ensuring the cleanliness of the operating environment of the pillow block bearing, effectively preventing the intrusion of fine dust, thereby extending the service life of the bearing. At the same time, the moving plate is inserted into the installation hole of the pillow block bearing to limit the turntable. Description of the Drawings

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the overall device in the present utility model;

[0025] Figure 2 It is a disassembled three-dimensional structural schematic diagram of the sealing component in the present utility model;

[0026] Figure 3 It is a top-down three-dimensional structural sectional schematic diagram of the sealing component in the present utility model;

[0027] Figure 4 It is a disassembled three-dimensional structural schematic diagram of the limit ring and the turntable in the present utility model;

[0028] Figure 5 It is a disassembled three-dimensional structural schematic diagram of the protection component in the present utility model.

[0029] Legend Explanation:

[0030] 1. Dust chamber; 2. Oil seal installation pad; 3. Fixed seat; 41. Pillow block bearing; 42. Rotating shaft; 43. Oil seal one; 44. Oil seal gland one; 45. Oil seal two; 46. Oil seal gland two; 47. One-way connector; 48. Air pipe; 49. Conduit; 51. Limit ring; 52. Turntable; 53. Pull rod; 54. Moving plate; 55. Compression spring; 56. Threaded rib. Detailed Implementation Manner

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0032] Refer to Figure 1 - Figure 3, an embodiment provided by the present utility model: a sealing structure for a rotating shaft in a powder environment, including a dust chamber 1, which is the space where the powder exists and operates. On the left side of the dust chamber 1, there is an oil seal mounting pad 2, which provides a stable mounting space for two groups of oil seals. On the left side of the oil seal mounting pad 2, there is a fixed seat 3 fixedly connected, which is used to mount the pillow block bearing 41. On the left side of the fixed seat 3, there is a sealing assembly. The sealing assembly includes a pillow block bearing 41, which is used to support the rotating shaft 42 and ensure its stable rotation. This technology is an existing technology, so it will not be elaborated here. The right side of the pillow block bearing 41 is fixedly connected to the left side of the fixed seat 3. The pillow block bearing 41 and the fixed seat 3 are installed by bolts. The inner wall of the pillow block bearing 41 is provided with a rotating shaft 42, which is the rotating component in the device and is used to convey the powder. The left inner wall of the fixed seat 3 is fixedly connected with an oil seal 43 to further enhance the sealing effect. Together with the oil seal 45, a sealed cavity is formed between the inner side of the oil seal mounting pad 2 and the outer side of the rotating shaft 42 to prevent dust from penetrating and affecting the rotating shaft 42. The inner side of the oil seal 43 rotates on the outer side of the rotating shaft 42.

[0033] Furthermore, the left inner wall of the oil seal 43 is clamped with an oil seal gland 44 to fix the position of the oil seal 43 and enhance the sealing effect. The right side of the oil seal gland 44 is fixedly connected to the left side of the oil seal mounting pad 2. The right inner wall of the oil seal mounting pad 2 is provided with an oil seal 45, which cooperates with the rotating shaft 42 to play a preliminary sealing role to prevent dust from entering. The inner side of the oil seal 45 rotates on the outer side of the rotating shaft 42. The right side of the oil seal 45 is clamped with an oil seal gland 46 to fix the position of the oil seal 45. The outer left part of the oil seal gland 46 is fixedly connected to the right side of the oil seal mounting pad 2. The rear side of the oil seal mounting pad 2 is fixedly connected with a one-way connector 47 through which an air pipe 48 is installed.

[0034] Refer to Figure 2 and Figure 3, there are multiple sets of one-way connectors 47, which are respectively arranged on the front side of the oil seal mounting pad 2 and the left side of the dust chamber 1. A trachea 48 is fixedly connected to the rear side of the one-way connector 47. The trachea 48 is used to connect the air pump and the oil seal mounting pad 2, so that gas can be blown into the closed cavity formed by the second oil seal 45 and the first oil seal 43 between the inner side of the oil seal mounting pad 2 and the outer side of the rotating shaft 42. The leakage of powder from the second oil seal 45 is caused by continuous accumulation and extrusion. The leaked powder is blown into the conduit 49. A conduit 49 is fixedly connected to the front end of a set of one-way connectors 47 on the front side of the oil seal mounting pad 2. By connecting the one-way connectors 47 at different positions, the circulation of gas is realized. The right side of the upper end of the conduit 49 is fixedly connected to the left side of a set of one-way connectors 47 on the left side of the dust chamber 1, and the dust penetrating into the closed cavity can be re-transported into the dust chamber 1 for recycling. The second oil seal 45 and the first oil seal 43 form a closed cavity between the inner side of the oil seal mounting pad 2 and the outer side of the rotating shaft 42, enhancing the sealing effect between the rotating shaft 42 and the external environment. At the same time, the dust penetrating into the closed cavity is cleaned by gas, thereby protecting the rotating shaft 42 from the erosion and damage of the powder and improving the stability and reliability of the operation of the rotating shaft 42.

[0035] Refer to Figure 3 - Figure 5 , a protective component is arranged on the left side of the pedestal bearing 41. The protective component includes a limit ring 51 for limiting the turntable 52. The inner side of the limit ring 51 is fixedly connected to the outer side of the left end of the pedestal bearing 41. The outer wall of the limit ring 51 is slidably connected to the turntable 52. The turntable 52 is set in an X shape, which is convenient for disassembling or installing the pedestal bearing 41 after misaligning the turntable 52. The right side of the turntable 52 is attached to the left side of the pedestal bearing 41. By attaching to the outer side of the pedestal bearing 41, the turntable 52 can effectively prevent dust from entering the inside of the pedestal bearing 41, ensuring the cleanliness of the operating environment of the pedestal bearing 41 and effectively preventing the intrusion of fine dust. A pull rod 53 is slidably connected through the upper inner wall of the turntable 52 for pulling the moving plate 54 to move. The right side of the pull rod 53 is rotatably connected to the moving plate 54 for limiting the turntable 52, thereby preventing the turntable 52 from rotating during the operation of the device.

[0036] Further, the outer wall of the moving plate 54 slides on the inner wall of the mounting hole of the pedestal bearing 41. The moving plate 54 can block the mounting hole of the pedestal bearing 41. When the device is in a dusty environment with a large amount of dust, such a blockage can effectively prevent dust from entering the interior of the mounting hole and keep the inner wall clean. The left side of the moving plate 54 is elastically connected to the turntable 52 through a compression spring 55, providing an elastic restoring force for the moving plate 54. There are four sets of the pull rod 53, the moving plate 54, and the compression spring 55, which can simultaneously protect the four sets of mounting holes on the pedestal bearing 41. A threaded rib 56 is provided on the outer side of the pull rod 53 close to the moving plate 54, and a threaded groove is formed in the sliding part of the outer side of the pull rod 53 and the turntable 52. The outer wall of the threaded rib 56 rotates and slides on the inner wall of the threaded groove. By pulling the pull rod 53 outward from the turntable 52 and rotating the pull rod 53, the threaded rib 56 on the pull rod 53 slides on the inner wall of the threaded groove, thereby limiting the pull rod 53 and the moving plate 54. At this time, the turntable 52 can be rotated to disassemble or install the pedestal bearing 41.

[0037] Working principle: When in use, when the device is working in an environment with a large amount of dust, the rotating shaft 42 rotates to drive related components to convey powder materials. When a small amount of dust continuously accumulates and gradually squeezes through the second oil seal 45 at the contact surface between the second oil seal 45 and the rotating shaft 42 and enters the sealed cavity, the air pump connected through the air pipe 48 conveys gas to the one-way connector 47, so that the gas can blow towards the sealed cavity formed between the second oil seal 45 and the first oil seal 43 on the inner side of the oil seal mounting pad 2 and the outer side of the rotating shaft 42. The infiltrated dust is blown through the one-way connector 47 on the front side of the oil seal mounting pad 2 to the conduit 49, and the conduit 49 then conveys the dust back to the dust chamber 1 through the one-way connector 47 on the left side of the dust chamber 1 for recycling.

[0038] When it is necessary to disassemble or install the pedestal bearing 41, pull the pull rod 53 outward from the turntable 52 to squeeze the compression spring 55. At this time, rotate the pull rod 53 so that the threaded rib 56 on the pull rod 53 slides on the inner wall of the threaded groove to limit the pull rod 53 and the moving plate 54. At this time, the turntable 52 can be rotated to complete the operation on the pedestal bearing 41. After the operation is completed, rotate the turntable 52 to align the moving plate 54 with the mounting hole on the pedestal bearing 41, and then rotate the pull rod 53 in the reverse direction. Under the action of the compression spring 55, the moving plate 54 re-blocks the mounting hole, and the turntable 52 returns to its original position to continue the protection.

[0039] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A sealing structure for a rotating shaft in a powder environment, comprising a dust chamber (1), characterized in that: An oil seal mounting pad (2) is arranged on the left side of the dust chamber (1), a fixed seat (3) is fixedly connected to the left side of the oil seal mounting pad (2), a sealing assembly is arranged on the left side of the fixed seat (3), and the sealing assembly comprises a seat bearing (41), the right side of the seat bearing (41) is fixedly connected to the left side of the fixed seat (3), a rotating shaft (42) is arranged on the inner wall of the seat bearing (41), an oil seal 1 (43) is fixedly connected to the inner wall of the left side of the fixed seat (3), the inner side of the oil seal 1 (43) rotates on the outside of the rotating shaft (42), an oil seal pressure cover 1 (44) is clamped on the inner wall of the left side of the oil seal 1 (43), and the right side of the oil seal pressure cover 1 (44) is fixedly connected to the left side of the oil seal mounting pad (2).

2. The sealing structure for a rotating shaft in a powder environment according to claim 1, characterized in that: The right inner wall of the oil seal mounting pad (2) is provided with an oil seal 2 (45), the inner side of the oil seal 2 (45) rotates on the outer side of the rotating shaft (42), the right side of the oil seal 2 (45) is clamped with an oil seal pressure cover 2 (46), the left outer side of the oil seal pressure cover 2 (46) is fixedly connected to the right side of the oil seal mounting pad (2), and a one-way connector (47) is passed through and fixedly connected to the rear side of the oil seal mounting pad (2).

3. The sealing structure for a rotating shaft in a powder environment according to claim 2, characterized in that: The one-way connectors (47) are provided in multiple groups and are respectively provided on the front side of the oil seal mounting pad (2) and on the left side of the dust chamber (1); the rear side of the one-way connector (47) is fixedly connected to an air pipe (48); the front end of a group of one-way connectors (47) on the front side of the oil seal mounting pad (2) is fixedly connected to a conduit (49); the right side of the upper end of the conduit (49) is fixedly connected to the left side of a group of one-way connectors (47) on the left side of the dust chamber (1).

4. The sealing structure for a rotating shaft in a powder environment according to claim 2, characterized in that: The second oil seal (45) and the first oil seal (43) form a closed cavity on the inner side of the oil seal mounting pad (2) and the outer side of the rotating shaft (42).

5. The sealing structure for a rotating shaft in a powder environment according to claim 1, characterized in that: A protective component is arranged on the left side of the seat bearing (41), and the protective component comprises a limit ring (51), the inner side of the limit ring (51) is fixedly connected to the outer side of the left end of the seat bearing (41), the outer wall of the limit ring (51) is slidably connected to a turntable (52), the right side of the turntable (52) is attached to the left side of the seat bearing (41), and a pull rod (53) is slidably connected to the upper inner wall of the turntable (52).

6. The sealing structure for a rotating shaft in a powder environment according to claim 5, characterized in that: The right side of the pull rod (53) is rotatably connected to a moving plate (54), and the left side of the moving plate (54) is elastically connected to the rotating disk (52) via a compression spring (55). A threaded convex strip (56) is provided on the outer side of the pull rod (53) close to the moving plate (54).

7. The sealing structure for a rotating shaft in a powder environment according to claim 6, characterized in that: The outer side of the pull rod (53) and the sliding part of the rotating disk (52) are provided with a thread groove, and the outer wall of the threaded protrusion (56) rotates and slides on the inner wall of the thread groove.

8. The sealing structure for a rotating shaft in a powder environment according to claim 6, characterized in that: The outer wall of the movable plate (54) slides on the inner wall of the mounting hole on the seat bearing (41).

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