A three-stage composite sealing device for an extraction tank stirring shaft

Abstract

This utility model relates to the field of extraction stirring shaft sealing technology, and discloses a three-stage composite sealing device for the stirring shaft of an extraction tank. It includes a fixed frame, a power module mounted on the fixed frame, a stirring paddle fixedly connected to the power module, a fixed cylinder fixedly connected to the inner top wall of the fixed frame, a fixed ring bolted to the outer wall of the fixed cylinder, one end of a spring attached to the lower surface of the fixed ring, a moving ring fixedly connected to the other end of the spring, the moving ring bolted to the stirring paddle, a stationary ring attached to the moving ring, and a stationary ring base fixedly connected to the lower surface of the fixed frame. In this utility model, the mechanical seal achieves high-frequency maintenance without manual water replenishment through the spring, moving ring, and stationary ring, eliminating the water replenishment process, shortening the moving ring replacement time, improving work efficiency, reducing labor costs, and allowing continuous operation without any maintenance intervention; it also avoids the instability of manual water replenishment, reducing environmental and safety hazards.

Description

Technical Field

[0001] This utility model relates to the field of extraction stirring shaft sealing technology, and in particular to a three-stage composite sealing device for the stirring shaft of an extraction tank. Background Technology

[0002] In many industrial production fields such as chemical engineering, metallurgy, and pharmaceuticals, extraction is a crucial separation and purification technology. As the core equipment for the extraction process, the performance of the extraction tank directly affects the efficiency, product quality, and production safety of the entire production process. Within the extraction tank, the stirring shaft plays a vital role. By driving the rotation of the stirring blades, it ensures thorough mixing and contact between the two-phase (or three-phase) materials within the extraction tank, thereby promoting mass transfer and improving extraction efficiency.

[0003] However, during operation, the stirring shaft inevitably creates a gap between itself and the extraction tank as it penetrates the tank body. The extraction tank typically processes liquids containing various chemicals, some of which may be corrosive, toxic, or flammable. If this gap is not effectively sealed, the liquid inside the tank will leak out, leading to waste of raw materials, increased production costs, potential environmental pollution, and even safety accidents such as fires, explosions, or poisoning.

[0004] Some water seal structures rely on the liquid level in the tank to form a liquid seal, thus achieving a sealing effect. When the agitator shaft of the extraction tank is running, a certain liquid level is maintained in the tank. Due to the viscosity and surface tension of the liquid, a liquid film forms between the moving water seal and the liquid. However, extraction tanks typically operate under certain temperature conditions, especially in processes requiring heating to promote the extraction reaction. The water in the tank is affected by the ambient temperature and evaporates. With prolonged continuous operation of the agitator shaft, the rate of water evaporation gradually accelerates. The continuous evaporation of water in the tank causes the liquid level to gradually drop. When the liquid level drops to a certain point, an effective liquid seal cannot be formed. Therefore, to ensure the sealing performance of the water seal structure, operators need to periodically replenish water in the tank to maintain the necessary liquid level. Manual water replenishment requires additional manpower, including operator wages and training costs, which further increases the equipment maintenance costs. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a three-stage composite sealing device for the stirring shaft of an extraction tank, which aims to improve the problem that the traditional water seal structure requires additional manpower for manual water replenishment, thus increasing the equipment maintenance cost.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A three-stage composite sealing device for an extraction tank stirring shaft includes a fixed frame, a power module mounted on the fixed frame, a stirring paddle fixedly connected to the power module, a fixed cylinder fixedly connected to the inner top wall of the fixed frame, a fixed ring bolted to the outer wall of the fixed cylinder, one end of a spring attached to the lower surface of the fixed ring, a moving ring fixedly connected to the other end of the spring, the moving ring bolted to the stirring paddle, a stationary ring attached to the moving ring, and a stationary ring base fixedly connected to the lower surface of the fixed frame, the stationary ring being embedded inside the stationary ring base.

[0007] Preferably, the power module includes a direct drive motor or a transmission device, both of which are mounted on a fixed frame.

[0008] Preferably, the device further includes a movable cover plate, which is connected to a secondary sealing structure, and the stationary ring base is connected to a tertiary sealing structure, which is connected to the movable cover plate.

[0009] Preferably, the secondary sealing structure includes an O-ring, which is installed on the inner wall of the movable cover plate.

[0010] Preferably, the secondary sealing structure further includes a sealing element embedded inside the movable cover plate.

[0011] Preferably, the three-stage sealing structure includes a locking nut, which is bolted to the movable cover plate.

[0012] Preferably, a threaded tube is fixedly connected to the lower surface of the stationary ring base, and the threaded tube is threadedly connected to the lock nut.

[0013] Preferably, the agitator passes through the stationary ring base and the movable cover plate.

[0014] This utility model has the following beneficial effects: 1. In this utility model, the mechanical seal achieves high-frequency maintenance without manual water replenishment through springs, a rotating ring, and a stationary ring. This eliminates the water replenishment process, shortens the replacement time of the rotating ring, improves work efficiency, and reduces labor costs. Continuous operation requires no maintenance intervention. It also avoids the instability of manual water replenishment, reducing environmental and safety hazards. Furthermore, it completely avoids and eliminates secondary pollution of the water seal fluid. Mixing the water seal fluid with volatiles can cause odors in the workshop, but the mechanical seal can prevent the mixing of the water seal fluid and volatiles.

[0015] 3. In this utility model, a three-level seal is achieved, namely, the main sealing layer: a single-end mechanical seal with a static ring, a dynamic ring, and a spring; the secondary sealing layer: a static seal formed by the sealing element and the O-ring; and the tertiary protective layer: a physical isolation barrier formed by the threaded pipe and the nut; which can achieve a better sealing effect and simultaneously block the gas / liquid leakage path; and the threaded structure of the threaded pipe can achieve quick installation and maintenance. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the fixing frame structure of this utility model; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This utility model Figure 3 Enlarged view of point A in the middle; Figure 5 This utility model Figure 2 Enlarged view of point B in the middle; Figure 6 This utility model Figure 3 Enlarged view of point C in the middle; Figure 7 This utility model Figure 1 Enlarged diagram of point D in the middle.

[0017] Legend: 1. Fixed frame; 2. Power module; 3. Agitator; 4. Fixed cylinder; 5. Fixed ring; 6. Spring; 7. Moving ring; 8. Stationary ring; 9. Movable cover plate; 10. O-ring; 11. Seal; 12. Stationary ring base; 13. Threaded pipe; 14. Locking nut. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see the appendix Figure 1 -Appendix Figure 7 This utility model provides a three-stage composite sealing device for an extraction tank stirring shaft, including a fixed frame 1, a power module 2 mounted on the fixed frame 1, a stirring paddle 3 fixedly connected to the power module 2, a fixed cylinder 4 fixedly connected to the inner top wall of the fixed frame 1, a fixed ring 5 bolted to the outer wall of the fixed cylinder 4, one end of a spring 6 attached to the lower surface of the fixed ring 5, a moving ring 7 fixedly connected to the other end of the spring 6, the moving ring 7 bolted to the stirring paddle 3, a stationary ring 8 attached to the moving ring 7, a stationary ring base 12 fixedly connected to the lower surface of the fixed frame 1, and the stationary ring 8 embedded inside the stationary ring base 12.

[0020] Specifically, the power module 2 provides power for stirring. Typically, the power module 2 is driven by a direct-drive motor. The transmission device 15 can be connected to an external transmission mechanism, such as driving the stirring paddle 3 to rotate via a belt, pulley, or gear. During stirring, the moving ring 7 rotates with the shaft, while the stationary ring 8 remains stationary. The sealing surfaces of the two are tightly fitted under the action of spring force and medium pressure, and the liquid film forms a dynamic barrier to prevent the medium from leaking through the sealing surface. With long-term operation, the sealing surface may wear slightly. In this application, the spring 6 automatically pushes the moving ring 7 towards the stationary ring 8 to compensate for the wear and maintain the sealing surface fit. This solution uses a mechanical seal, eliminating the need for water addition and the water replenishment process. Continuous operation requires no maintenance intervention, and there is no problem of secondary pollution caused by the mixing of water seal fluid and volatiles. The mechanical seal works stably and reliably.

[0021] Please see the appendix Figure 1 The power module 2 includes a direct drive motor or a transmission device, both of which are mounted on the fixed frame 1.

[0022] Specifically, in one embodiment, the power module 2 is driven by a direct drive motor and rotates in conjunction with bearings. In another embodiment, the drive unit 15 can be connected to an external drive machine, such as driving the agitator 3 to rotate through a belt with pulleys or gears.

[0023] Please see the appendix Figure 1 -Appendix Figure 2 It also includes a movable cover plate 9, which is connected to a secondary sealing structure, and a stationary ring base 12, which is connected to a tertiary sealing structure. The tertiary sealing structure is connected to the movable cover plate 9.

[0024] Specifically, this device is equipped with a secondary sealing structure and a tertiary sealing structure. The secondary sealing structure prevents static leakage, and the tertiary sealing structure achieves physical isolation.

[0025] Please see the appendix Figure 1 and attached Figure 7 The secondary sealing structure includes an O-ring 10, which is installed on the inner wall of the movable cover plate 9; the secondary sealing structure also includes a seal 11, which is embedded inside the movable cover plate 9.

[0026] Specifically, the secondary sealing structure is a static seal composed of the sealing element 11 and the O-ring 10, which can maintain the seal even with ±5mm axial movement during stirring.

[0027] Please see the appendix Figure 1 Appendix Figure 3 Appendix Figure 6 and attached Figure 7The three-stage sealing structure includes a locking nut 14, which is bolted to the movable cover plate 9; a threaded pipe 13 is fixedly connected to the lower surface of the stationary ring base 12, which is threaded to the locking nut 14; and the stirring paddle 3 passes through the stationary ring base 12 and the movable cover plate 9.

[0028] Specifically, the three-level protective layer is a physical isolation barrier formed by the threaded tube 13 extending into the groove and the locking nut 14, and the threaded structure allows for quick installation and maintenance.

[0029] Working principle: The power module 2 consists of a direct drive motor and a bearing housing, providing power to the entire stirring system and driving the stirring paddle 3 to rotate. The inner top wall of the fixed frame 1 is equipped with a fixed cylinder 4, and a fixed ring 5 is bolted to the outer wall of the fixed cylinder 4. One end of the spring 6 is attached to the lower surface of the fixed ring 5, and the other end of the spring 6 is connected to the moving ring 7. The moving ring 7 is fixedly connected to the stirring paddle 3 by bolts. The stationary ring 8 is embedded in the stationary ring base 12. During the stirring process, the moving ring 7 will rotate with the stirring paddle 3, while the stationary ring 8 remains stationary. The sealing surfaces of the moving ring 7 and the stationary ring 8 are tightly fitted under the combined action of the spring force and the medium pressure, thus forming a liquid film dynamic barrier. This liquid film can effectively prevent the medium from leaking through the sealing surface. When the device has been running for a long time and the sealing surface is slightly worn, the spring 6 will play an automatic compensation role, pushing the moving ring 7 to move towards the stationary ring 8 to compensate for the wear in time, ensuring that the sealing surface always remains tightly fitted and maintains a good sealing effect. The movable cover plate 9 is connected to a secondary sealing structure, which mainly consists of an O-ring 10 installed on the inner wall of the movable cover plate 9 and a sealing element 11 embedded inside the movable cover plate 9. The secondary sealing structure achieves a static sealing function through the coordinated cooperation of the sealing element 11 and the O-ring 10. During the mixing operation, even if there is axial movement of the mixing shaft, the secondary sealing structure can still maintain a sealing state, effectively preventing static leakage. The stationary ring base 12 is connected to a three-stage sealing structure, which includes a locking nut 14. The locking nut 14 is bolted to the movable cover plate 9. A threaded pipe 13 is fixedly connected to the lower surface of the stationary ring base 12. The threaded pipe 13 and the locking nut 14 are connected by threads. The agitator 3 passes through the stationary ring base 12 and the movable cover plate 9. The three-stage protective layer is formed by the threaded pipe 13 extending into the groove and the locking nut 14, which together constitute a physical isolation barrier. During tightening, the thread sides can fit together, effectively reducing the possibility of direct leakage of the medium from the thread gap. In addition, the design of the threaded structure enables the three-stage sealing structure to be installed and maintained quickly, improving the efficiency and maintainability of the equipment.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is 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 make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A three-stage composite seal device for an extraction tank stirring shaft, comprising a fixed frame (1), characterized in that, The fixed frame (1) is equipped with a power module (2), the power module (2) is fixedly connected to a stirring paddle (3), the inner top wall of the fixed frame (1) is fixedly connected to a fixed cylinder (4), the outer wall of the fixed cylinder (4) is bolted to a fixed ring (5), the lower surface of the fixed ring (5) is attached to one end of a spring (6), the other end of the spring (6) is fixedly connected to a moving ring (7), the moving ring (7) is bolted to the stirring paddle (3), the moving ring (7) is attached to a stationary ring (8), the lower surface of the fixed frame (1) is fixedly connected to a stationary ring base (12), and the stationary ring (8) is embedded in the interior of the stationary ring base (12).

2. The three-stage composite seal device for the stirring shaft of an extraction tank according to claim 1, characterized in that, The power module (2) includes a direct drive motor or a transmission device, both of which are mounted on a fixed frame (1).

3. The three-stage composite sealing device for the stirring shaft of an extraction tank according to claim 1, characterized in that, It also includes a movable cover plate (9), which is connected to a secondary sealing structure, and the stationary ring base (12) is connected to a tertiary sealing structure, which is connected to the movable cover plate (9).

4. The three-stage composite sealing device for the stirring shaft of an extraction tank according to claim 3, characterized in that, The secondary sealing structure includes an O-ring (10), which is installed on the inner wall of the movable cover plate (9).

5. The three-stage composite seal for an extraction tank stirring shaft according to claim 4, characterized in that, The secondary sealing structure also includes a sealing element (11), which is embedded inside the movable cover plate (9).

6. The three-stage composite sealing device for the stirring shaft of an extraction tank according to claim 3, characterized in that, The three-stage sealing structure includes a locking nut (14), which is bolted to the movable cover plate (9).

7. The three-stage composite sealing device for the stirring shaft of an extraction tank according to claim 6, characterized in that, A threaded tube (13) is fixedly connected to the lower surface of the stationary ring base (12), and the threaded tube (13) is threadedly connected to the locking nut (14).

8. The three-stage composite sealing device for the stirring shaft of an extraction tank according to claim 3, characterized in that, The agitator (3) passes through the stationary ring base (12) and the movable cover plate (9).

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