A seal for a side entry agitator shaft

Abstract

The utility model relates to side -entry type agitator technical field especially is suitable for side -entry type agitator's stirring shaft sealing device, include: sealing main part, the radial of the stirring shaft is set, and with the stirring shaft does not contact, its one end is closely attached on the lateral wall of stirring body, the material baffle ring is set in the radial of the stirring shaft, and the material baffle ring rotates along with the rotation of stirring shaft, sealing element is located between the cavity inner wall and the stirring shaft, and is adjacent with the material baffle ring, in the utility model, first the material baffle ring fixed setting in the radial of the stirring shaft, utilizes the centrifugal force produced by its rotation, and removes the vast majority of stirring material, and then adds sealing element on the basis of the material baffle ring, and the trace amount of stirring material is completely blocked through the sealing element, prevents the axial seepage of stirring material along the stirring shaft, and ensures that the stirring shaft always keeps the sealed state.

Description

Technical Field

[0001] This utility model relates to the field of side-entry agitator technology, and in particular to a sealing device for the agitator shaft suitable for side-entry agitators. Background Technology

[0002] To improve the combustion efficiency of coal, existing technologies often involve adding appropriate amounts of chemical modifiers (such as metal oxides and alkali metal salts) to the raw coal powder. To improve the uniformity of the raw coal powder and chemical modifiers, the most common mixing method is to use a mixer, such as a vertical mixer or a side-entry mixer, to improve mixing efficiency and reduce labor intensity.

[0003] A side-entry agitator (also known as a side-in mixer or a side-extending mixer) is a high-efficiency and energy-saving mixing device installed on the side wall of the mixing body. It uses a motor to drive a mixing shaft, which in turn rotates the mixing blades. Through the mixing action of the blades, the materials achieve a uniform mixing effect. The emergence of side-entry agitators has replaced vertical agitators in situations where they cannot be used, and has significantly reduced costs.

[0004] Due to the unique installation location of the side-entry mixer (installed on the side wall of the mixing body), the mixing shaft runs through the mixing body, and the mixing material level inside the mixing body is higher than the mixing shaft position. In order to ensure the smooth rotation of the mixing shaft in the long term, the junction between the mixing shaft and the mixing body cannot be 100% sealed during the installation process, and there will be a certain gap between them. Therefore, a sealing device needs to be installed at the junction between the mixing shaft and the side wall of the mixing body to prevent the mixing material from leaking along the axial direction of the mixing shaft.

[0005] Chinese patent publication number CN218871833U discloses a sealing device for a stirring shaft, comprising: a motor, a stirring shaft, and a stirring drum. The motor is positioned above the stirring drum, and the stirring shaft is vertically positioned inside the stirring drum, with its upper end extending upward through the stirring drum and connected to the motor for transmission. The device also includes two support columns, a sealing base, a sealing pressure member, and a sealing element. The two support columns, the sealing base, and the sealing pressure member are all located between the motor and the stirring drum. The sealing base is fixed directly above the stirring drum, the sealing pressure member is located on the sealing base, and the sealing element is located between the sealing pressure member and the sealing base. The stirring shaft passes through the sealing pressure member and the sealing base. The two support columns are located on both sides of the sealing base to connect the motor and the stirring drum. In use, the stirring shaft passes through the sealing base and the sealing pressure member through a shaft through-hole and a stirring shaft groove, placing the sealing element within the sealing groove, i.e., within the annular space formed by the stirring shaft, the sealing base, and the sealing extension. The sealing element expands under the downward pressure of the sealing extension, thus completely and closely fitting the stirring shaft.

[0006] In the aforementioned patent, although the sealing device has a certain sealing effect in the early stages, it is difficult to ensure that the stirring shaft remains sealed by the sealing element alone. This is because as the stirring shaft is used for a long time, a large amount of material being stirred will corrode the sealing element, reducing its sealing effect and causing the material to leak along the axial direction of the stirring shaft. Utility Model Content

[0007] The purpose of this invention is to provide a sealing device for the stirring shaft of a side-entry stirrer, so as to solve the problems mentioned in the background art.

[0008] The technical solution adopted in this utility model is:

[0009] A sealing device for the agitator shaft of a side-entry agitator, comprising:

[0010] A sealing body extends through the front and back to form a cavity. The sealing body is sleeved on the radial side of the stirring shaft and does not contact the stirring shaft. The sealing body extends along the axial side of the stirring shaft, and one end of the sealing body is tightly attached to the side wall of the stirring body.

[0011] The baffle ring is located radially on the stirring shaft, inside the cavity, and does not contact the cavity wall. The baffle ring rotates with the rotation of the stirring shaft, thereby generating centrifugal force and throwing out the stirred material.

[0012] The sealing element is located between the inner peripheral wall of the cavity and the stirring shaft, and is adjacent to the baffle ring.

[0013] Optionally, the sealing body includes:

[0014] A large-radius cylinder with a large cavity inside;

[0015] A small-radius cylinder is coaxial with and integrally formed with the large-radius cylinder. The end face of the small-radius cylinder is in close contact with the stirring body, and a small cavity is formed inside the small-radius cylinder.

[0016] Optional,

[0017] The distance from the wall of the large cavity to the stirring shaft is 150~200mm;

[0018] The distance from the small cavity wall to the stirring shaft is 1-3 mm, and the spacing between the small cavity wall and the stirring shaft constitutes the first flow channel.

[0019] Optional,

[0020] The baffle ring is located inside the large cavity and does not contact the top wall or side wall of the large cavity.

[0021] The distance between the baffle ring and the side wall of the large cavity forms a second flow channel. The second flow channel communicates with the first flow channel, and the width of the second flow channel is much smaller than the width of the first flow channel.

[0022] The distance between the baffle ring and the top wall of the large cavity forms a third flow channel, which is connected to the second flow channel and the first flow channel.

[0023] Optionally, the baffle ring is provided with a plurality of throwing blades at an angle in the radial direction, and a first channel is provided on the large-radius cylinder opposite to the throwing blades. A collection groove is also provided on the large-radius cylinder opposite to the first channel.

[0024] Optionally, the tilt angle of the material-throwing blade is 20°-25°, and the height of the material-throwing blade is 5-8mm.

[0025] Optionally, the seal includes:

[0026] A graphene-silicon carbide (SiC) composite layer is disposed in the inner layer and is in contact with the stirring shaft;

[0027] A graphene-polytetrafluoroethylene (PTFE) composite layer is placed in the middle layer;

[0028] An expanded graphite layer is disposed on the outer layer and connected to the top wall of the large cavity.

[0029] Optionally, the contact surface between the seal and the stirring shaft has a honeycomb microstructure, which stores lubricating grease.

[0030] Optionally, a cooling component may also be included.

[0031] Optionally, the cooling assembly includes:

[0032] Circulation device;

[0033] The second channel is formed on the large-radius cylinder, corresponding to the sealing element;

[0034] An inflow channel is formed on the large-radius cylinder, with one end connected to the circulation device and the other end connected to the second channel;

[0035] An outflow channel is formed on the large-radius cylinder, opposite to the inflow channel, and located above the inflow channel. One end of the outflow channel is connected to the circulation device, and the other end is connected to the second channel.

[0036] Compared with the prior art, the beneficial effects of this utility model are:

[0037] In this invention, a baffle ring is first fixed radially on the stirring shaft. The centrifugal force generated by its rotation removes most of the mixing material. Then, a sealing element is added to the baffle ring to completely block even the smallest amount of mixing material, preventing leakage along the stirring shaft's axial direction and ensuring the shaft remains sealed. Because the baffle ring is constantly rotating, it effectively removes mixing material regardless of the shaft's operating time, preventing the problem of large amounts of mixing material corroding the seal over time and causing seal failure. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the overall structure of this application;

[0040] Figure 2 This is a schematic diagram of the overall structure of the sealing body in this application;

[0041] Figure 3 This is a schematic diagram of the structure of an embodiment of this application;

[0042] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle.

[0043] Figure label:

[0044] 1. Sealing body; 11. Large radius cylinder; 12. Large cavity; 13. Small radius cylinder; 14. Small cavity; 15. First channel; 16. Collection tank;

[0045] 2. Material retaining ring; 21. Material throwing blade;

[0046] 3. Sealing element; 31. Graphene-silicon carbide (SiC) composite layer; 32. Graphene-polytetrafluoroethylene (PTFE) composite layer; 33. Expanded graphite layer;

[0047] 4. Cooling assembly; 41. Second channel; 42. Inflow channel; 43. Outflow channel;

[0048] 5. Sealing gland; 51. Gland section; 52. Locking lug; 53. Bolt;

[0049] 6. Stirring shaft; 7. First flow channel; 8. Second flow channel; 9. Third flow channel; 10. Stirring body. Detailed Implementation

[0050] In the following text, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] Given that current sealing devices are too simple, it is difficult to ensure that the stirring shaft remains sealed by relying solely on sealing components.

[0052] like Figures 1-4 As shown, this utility model embodiment provides a stirring shaft sealing device suitable for side-entry stirrers, including: a sealing body 1, a baffle ring 2, and a sealing element 3, etc.

[0053] The sealing body 1 extends through the front and rear, forming a cavity. The sealing body 1 is fitted radially onto the stirring shaft 6 without contacting the stirring shaft 6, and extends axially along the stirring shaft 6. One end of the sealing body 1 is tightly fitted to the side wall of the stirring body 10.

[0054] The baffle ring 2 is fixedly installed on the radial side of the stirring shaft 6, located inside the cavity, and does not contact the cavity wall. The baffle ring 2 rotates with the rotation of the stirring shaft 6, thereby generating centrifugal force to throw out the stirred material.

[0055] The seal 3 is located between the inner peripheral wall of the cavity and the outer peripheral wall of the stirring shaft 6, adjacent to the baffle ring 2, and there is no contact between the seal 3 and the baffle ring 2. The seal 3 is configured to completely prevent the mixing material from leaking axially along the stirring shaft 6.

[0056] Specifically, such as Figure 2 As shown, the sealing body 1 is roughly in the shape of a stepped cylinder, consisting of two cylinders with different radii (large radius cylinder 11 and small radius cylinder 13) coaxially and integrally formed. The cavity corresponding to the large radius cylinder 11 is called the large cavity 12, and the cavity corresponding to the small radius cylinder 13 is called the small cavity 14. Neither the large cavity 12 nor the small cavity 14 is in contact with the stirring shaft 6. The distance from the wall of the large cavity 12 to the stirring shaft 6 is approximately 150-200 mm. The distance from the wall of the small cavity 14 to the stirring shaft 6 is approximately 1-3 mm, consistent with the distance from the stirring body 10 to the stirring shaft 6. The gap between the wall of the small cavity 14 and the stirring shaft 6, and the gap between the stirring body 10 and the stirring shaft 6, are collectively referred to as the first flow channel 7. The end face of the small radius cylinder 13 is in close contact with the stirring body 10.

[0057] The baffle ring 2 is located inside the large cavity 12 and does not contact the top or side walls of the large cavity 12. The gap between the baffle ring 2 and the side wall of the large cavity 12 is called the second flow channel 8. The second flow channel 8 communicates with the first flow channel 7, and the width of the second flow channel 8 is much smaller than the width of the first flow channel 7. This prevents larger particles of agitated material in the first flow channel 7 from entering, while only allowing very small particles or liquid agitated material to enter the second flow channel 8. The gap between the baffle ring 2 and the top wall of the large cavity 12 is called the third flow channel 9. The third flow channel 9 communicates with the second flow channel 8 and the first flow channel 7, and the width of the third flow channel 9 is approximately the same as the width of the first flow channel 7. This facilitates the rotating baffle ring 2 to throw the agitated material out.

[0058] Furthermore, in order to improve the efficiency of the material-throwing and mixing process of the baffle ring 2, such as... Figures 3-4 As shown, in this embodiment, multiple throwing blades 21 are irregularly arranged radially on the baffle ring 2. These throwing blades 21 are inclined, with an inclination angle of approximately 20°-25° (which can be optimized according to the rotational speed of the stirring shaft 6), and a blade height of approximately 5-8mm. Corresponding to the multiple throwing blades 21, a first channel 15 for the stirred material to pass through is opened on the large-radius cylinder 11, and a collection groove 16 is opened radially on the large-radius cylinder 11 corresponding to the first channel 15. The throwing blades 21 rotate under the drive of the baffle ring 2, thereby generating centrifugal force, which throws the stirred material in the third flow channel 9 and on the baffle ring 2 through the first channel 15 into the collection groove 16.

[0059] Seal 3 consists of three layers. For example... Figure 3 As shown in Figure 4, the inner layer is a graphene-silicon carbide (SiC) composite layer 31, which is attached to the outer peripheral wall of the stirring shaft 6. The high strength of graphene and the wear resistance of SiC can provide the main mechanical support and reduce the wear caused by the rotation of the stirring shaft 6. The middle layer is a graphene-polytetrafluoroethylene (PTFE) composite layer 32, and the lubricating properties of PTFE reduce friction. The outer layer is an expanded graphite layer 33, which is fixedly connected to the top wall of the large cavity 12. The expanded graphite layer 33 expands when it comes into contact with liquid to fill the tiny gaps.

[0060] Furthermore, to improve the wear resistance of the seal 3, in this embodiment, the contact surface between the seal 3 and the stirring shaft 6 is a honeycomb microstructure, which stores lubricating grease, thereby reducing frictional heat.

[0061] Furthermore, to prevent the seal 3 from overheating due to friction with the stirring shaft 6, thereby reducing the service life of the seal 3, the stirring shaft sealing device also includes a cooling assembly 4.

[0062] Specifically, such as Figure 1As shown in Figure 3, the cooling assembly 4 includes several parts such as a second channel 41, an inflow channel 42, an outflow channel 43, and a circulation device (not shown in the figure).

[0063] The second channel 41 is located on the large-radius cylinder 11, corresponding to the seal 3.

[0064] The inflow channel 42 is opened on the large-radius cylinder 11, with one end connected to the circulation device and the other end connected to the second channel 41.

[0065] The outflow channel 43 is opened on the large radius cylinder 11, opposite to the inflow channel 42, and located above the inflow channel 42. One end of it is connected to the circulation device, and the other end is connected to the second channel 41.

[0066] The cooling medium in the circulation device enters the second channel 41 through the lower inflow channel 42. Under the action of its own weight, the cooling medium fills the entire second channel 41 and then flows out through the upper outflow channel 43 back into the circulation device. The cooling medium in the circulation device then enters the second channel 41 again through the inflow channel 42, thereby realizing the circulation of the cooling medium. In this embodiment, the cooling medium enters the second channel 41 through the lower inflow channel 42. Under the action of its own weight, the cooling medium must fill the entire second channel 41 before it can flow out through the upper outflow channel 43. This maximizes the contact area between the cooling medium and the sealing element 3, thereby maximizing the heat exchange area and effectively removing heat from the sealing element 3.

[0067] Furthermore, the stirring shaft sealing device also includes a sealing cap 5, which includes a cap portion 51 and at least two locking lugs 52.

[0068] The pressure cap 51 is slidably disposed within the large cavity 12, with one end fitting against the sealing element 3 and the other end extending outside the large cavity 12. The bottom end of the pressure cap 51 does not contact the stirring shaft 6.

[0069] A locking lug 52 is located at one end of the pressure cap 51 outside the large cavity 12, and has a first internal thread (not shown in the figure). Corresponding to the first internal thread of the locking lug 52, a second internal thread (not shown in the figure) is formed on the large radius cylinder 11. The bolt 53 passes through the first internal thread and the second internal thread in sequence, thereby realizing the connection between the sealing pressure cap 5 and the large radius cylinder 11, preventing the seal 3 from moving or misaligning due to long-term friction with the stirring shaft 6.

[0070] In operation, the stirring shaft 6 rotates under the drive of the motor, thus stirring the material in the stirring body 10. During the stirring process, a very small portion of the material enters the first flow channel 7 along the axial direction of the stirring shaft 6. Then, very small particles or liquid enter the second flow channel 8. Some of the material adheres to the baffle ring 2, while the rest enters the third flow channel 9 through the second flow channel 8. The baffle ring 2 rotates under the drive of the stirring shaft 6. Simultaneously, the throwing blades 21 rotate synchronously under the drive of the baffle ring 2, generating centrifugal force. This force throws the material adhering to the baffle ring 2 and located in the third flow channel 9 through the first channel 15 to the collection tank 16 for centralized processing. The rotating baffle ring 2 and the throwing blades 21 can remove 98% of the material. A very small amount of material is completely blocked by the seal 3, thus ensuring that the stirring shaft 6 remains sealed at all times.

[0071] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the 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 make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sealing device for the stirring shaft of a side-entry agitator, characterized in that, include: A sealing body extends through the front and back to form a cavity. The sealing body is sleeved on the radial side of the stirring shaft and does not contact the stirring shaft. The sealing body extends along the axial side of the stirring shaft, and one end of the sealing body is tightly attached to the side wall of the stirring body. The baffle ring is located radially on the stirring shaft, inside the cavity, and does not contact the cavity wall. The baffle ring rotates with the rotation of the stirring shaft, thereby generating centrifugal force and throwing out the stirred material. The sealing element is located between the inner peripheral wall of the cavity and the stirring shaft, and is adjacent to the baffle ring.

2. The stirring shaft sealing device according to claim 1, characterized in that, The sealing body includes: A large-radius cylinder with a large cavity inside; A small-radius cylinder is coaxial with and integrally formed with the large-radius cylinder. The end face of the small-radius cylinder is in close contact with the stirring body, and a small cavity is formed inside the small-radius cylinder.

3. The stirring shaft sealing device according to claim 2, characterized in that: The distance from the wall of the large cavity to the stirring shaft is 150~200mm; The distance from the small cavity wall to the stirring shaft is 1-3 mm, and the spacing between the small cavity wall and the stirring shaft constitutes the first flow channel.

4. The stirring shaft sealing device according to claim 3, characterized in that: The baffle ring is located inside the large cavity and does not contact the top wall or side wall of the large cavity. The distance between the baffle ring and the side wall of the large cavity forms a second flow channel. The second flow channel communicates with the first flow channel, and the width of the second flow channel is much smaller than the width of the first flow channel. The distance between the baffle ring and the top wall of the large cavity forms a third flow channel, which is connected to the second flow channel and the first flow channel.

5. The stirring shaft sealing device according to claim 2, characterized in that, Multiple material-throwing blades are inclinedly arranged in the radial direction of the baffle ring. A first channel is opened on the large-radius cylinder opposite to the material-throwing blades, and a collection groove is also opened on the large-radius cylinder opposite to the first channel.

6. The stirring shaft sealing device according to claim 5, characterized in that, The tilt angle of the material-throwing blade is 20°-25°, and the height of the material-throwing blade is 5-8mm.

7. The stirring shaft sealing device according to claim 2, characterized in that, The sealing element includes: A graphene-silicon carbide (SiC) composite layer is disposed in the inner layer and is in contact with the stirring shaft; A graphene-polytetrafluoroethylene (PTFE) composite layer is placed in the middle layer; An expanded graphite layer is disposed on the outer layer and connected to the top wall of the large cavity.

8. The stirring shaft sealing device according to claim 1 or 7, characterized in that, The contact surface between the seal and the stirring shaft has a honeycomb microstructure, which stores lubricating grease.

9. The stirring shaft sealing device according to claim 2, characterized in that, It also includes a cooling component.

10. The stirring shaft sealing device according to claim 9, characterized in that, The cooling assembly includes: Circulation device; The second channel is formed on the large-radius cylinder, corresponding to the sealing element; An inflow channel is formed on the large-radius cylinder, with one end connected to the circulation device and the other end connected to the second channel; An outflow channel is formed on the large-radius cylinder, opposite to the inflow channel, and located above the inflow channel. One end of the outflow channel is connected to the circulation device, and the other end is connected to the second channel.

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