Mechanical sealing structure of stirrer

Abstract

The utility model discloses a mechanical seal structure of a stirrer, and particularly relates to the technical field of mechanical seals, the mechanical seal structure comprises a main shaft, a movable ring, a static ring and a rubber ring seat, lip rings on two sides are arranged on the inner ring wall of the static ring, the lip rings are contacted with the movable ring to form a sealing interface, and meanwhile, oil filled in an oil seal cavity forms a liquid film to effectively prevent leakage, so that the service life of the stirrer is prolonged. Reinforcing ribs are arranged in the static ring, the structural strength of the static ring is enhanced so as to bear a high-pressure environment, the concentricity of the static ring can be kept through the arrangement of a rubber ring seat, the rubber ring seat can be fixed to a stirrer support, and therefore the radial load and axial deviation during shaft operation are relieved; according to the mechanical seal, axial movement of the movable ring is avoided, the rubber ring seat flexible connection between the static ring and the reaction kettle effectively buffers the load in operation, the radial load and the axial deviation of the mechanical seal are reduced, and the structure can keep excellent sealing performance under the conditions of high corrosivity and complex operation.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, and specifically relates to a mechanical seal structure of a stirrer. Background Technique

[0002] A stirrer is an important mechanical device that forces the convection and uniform mixing of liquid and gas media. It is extremely common in fields such as petrochemical, biopharmaceutical, food processing, textile printing and dyeing, and environmental protection engineering.

[0003] Function of the stirrer mechanical seal: The mechanical seal is a sealing element between the stirrer shaft and the reaction kettle. During operation, the closing force caused by the sealing fluid pressure and the elastic force of the elastic element makes the end faces of the dynamic ring and the static ring fit together, and a very thin liquid film is maintained in the extremely small gap between the two end faces to achieve sealing. When the dynamic and static rings are worn and the gap increases, the seal between the stirrer and the reaction kettle fails, and material leakage causes the equipment to stop running due to a fault, affecting production. The reasons include the following aspects:

[0004] 1. Medium: The main media in the reaction kettle are high-boiling substances and washed silicon powder. When the stirrer rotates, it transfers mechanical energy to the fluid, forming a highly turbulent and fully mixed area near the stirrer, and generating a high-speed jet to push the liquid to circulate in the stirring container. Some particulate matter is thrown out from the ends of the blades and enters the mechanical seal chamber, causing wear of the end faces of the dynamic and static rings and the sealing ring, and equipment damage after seal failure.

[0005] 2. Concentricity: The fixed bracket of the reaction kettle and the stirrer is a split structure. The static ring of the mechanical seal is fixed to the reaction kettle, and the dynamic ring is fixed to the stirrer shaft. During operation, the shaft swings. Due to the excessive perpendicularity deviation between the sealing end faces of the dynamic and static rings and the axis center line of the shaft, the sealing end faces do not fit tightly, resulting in non-concentricity of the mechanical seal and causing leakage.

[0006] 3. Axial movement of the shaft: The materials of the reaction kettle and the bracket are different. When the temperature (operating temperature - ambient temperature) changes, the shaft clamping of the mechanical seal slips due to different thermal expansion coefficients, resulting in an increase in the axial movement amount of the shaft. The components related to the seal do not cooperate well, and the dynamic and static rings are separated, causing leakage.

[0007] Previously, for this maintenance work, new mechanical seals were purchased, which had a high cost and a long procurement cycle; when replacing the mechanical seal, since the static ring of the mechanical seal is located under the bracket and connected to the reaction kettle, maintenance personnel need to bend down and drill in for operation, which is extremely dangerous, difficult to escape in case of emergencies, and affects the operation accuracy at the same time; finding concentricity requires welding and correcting the bracket to carry out, with a large construction difficulty and a long maintenance cycle. The above reasons result in the inability to quickly resume production within a short time after the equipment stops, and the direct economic loss caused by replacing new parts is relatively heavy. Therefore, we propose a mechanical seal structure of a stirrer to solve the above problems. Content of the Utility Model

[0008] The present utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0009] For this reason, the technical solution adopted by the present utility model is as follows:

[0010] A mechanical seal structure of a stirrer, including a main shaft, a moving ring is sleeved on the surface of the main shaft, a static ring is sleeved on the surface of the moving ring, a shaft holding clamp for preventing the moving ring from axially moving is arranged at the top of the moving ring, the shaft holding clamp is sleeved on the surface of the main shaft, the bottom of the shaft holding clamp contacts the moving ring, a rubber ring seat for keeping the static ring concentric with the main shaft is sleeved on the surface of the static ring, reinforcing ribs for enhancing the structural strength of the static ring itself are filled inside the static ring, lip rings for contacting the moving ring are fixedly connected to the upper and lower sides of the inner ring wall of the static ring, an oil seal chamber for filling oil is provided between the two lip rings, an assembly chamber is opened inside the static ring, a spring ring for driving the lip ring to closely adhere to the moving ring is arranged inside the assembly chamber, the spring ring is sleeved inside the static ring through the assembly chamber, the shaft holding clamp includes two assembly cylinders, the two assembly cylinders contact each other and are sleeved on the surface of the main shaft, threaded holes penetrating through the assembly cylinders are opened on the surface of the assembly cylinders, set screws are arranged inside the threaded holes, one end of the set screw located inside the assembly cylinder contacts the main shaft, a rubber ring seat is sleeved on the outer ring wall of the static ring, the inner ring wall of the rubber ring seat is fixedly connected to the static ring, and the outer ring wall of the rubber ring seat contacts and is fixedly connected to the stirrer support.

[0011] Preferably, the axes of the main shaft, the moving ring, the static ring and the rubber ring seat coincide.

[0012] Preferably, multiple reinforcing ribs are evenly distributed around the axis of the static ring, and the assembly chamber is arranged at the outer ring of the lip ring.

[0013] Preferably, the two lip rings are symmetrically distributed along the middle of the static ring.

[0014] Preferably, the inner ring wall of the lip ring contacts the moving ring, and the outer ring wall of the moving ring is rotatably connected to the lip ring.

[0015] Preferably, the bottom of the assembly cylinder contacts the moving ring, and connecting plates are fixedly connected to both sides of the two assembly cylinders.

[0016] Preferably, the two connecting plates are symmetrically distributed along the axis of the assembly cylinder, and fixing holes for installing bolts are opened on the surface of the connecting plates.

[0017] Preferably, multiple threaded holes are evenly distributed around the axis of the main shaft, and the set screw is threadedly connected to the assembly cylinder through the threaded hole.

[0018] By adopting the above technical solution, the beneficial effects obtained by the present utility model are as follows:

[0019] The main components of the mechanical seal of the present utility model include a main shaft, a dynamic ring, a static ring, and a rubber ring seat. The dynamic ring is sleeved on the surface of the main shaft, and the static ring is sleeved on the dynamic ring. Two side lip rings are provided on the inner wall of the inner ring of the static ring, and these lip rings contact the dynamic ring to form a sealing interface. At the same time, the oil liquid filled in the oil seal chamber forms a liquid film, effectively preventing leakage. Reinforcing ribs are provided inside the static ring to enhance its structural strength to withstand high-pressure environments. The rubber ring seat can not only maintain the concentricity of the static ring but also be fixed to the agitator support, thereby alleviating the radial load and axial deviation during shaft operation. The design of the shaft holding clamp, through the structure of two assembly cylinders and a connecting plate, and in cooperation with the adjustment of the setscrew, ensures that the dynamic ring will not axially move and can quickly restore the performance of the mechanical seal. The shaft holding clamp also makes the main shaft and the dynamic ring fit tightly to prevent the sealing performance from decreasing. The soft connection of the rubber ring seat between the static ring and the reactor effectively buffers the load during operation, reduces the radial load and axial deviation on the mechanical seal, and the design's adjustability and optimized design greatly simplify the operation, especially during cleaning and adjustment. The flange is cleaned with alcohol or acetone to remove the corrosion layer, and then treated with fine-grit sandpaper to ensure metallic luster. These steps ensure the reliability of the seal. The corrosion resistance and elasticity of the rubber enable it to effectively cope with the challenges in the industrial environment. In addition, the use of a metal flange pressing disc ensures the stability of the connection, and the selection of the rubber texture enables the device to maintain good performance under harsh conditions. The device not only improves the reliability and service life of the equipment but also makes the maintenance process safer and more efficient. Through precise design and high-quality material selection, this structure can maintain excellent sealing performance under highly corrosive and complex operating conditions, thus providing strong support for industrial applications. Brief Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the whole of the present utility model.

[0021] Figure 2 It is a schematic structural diagram of the assembly of the dynamic ring and the shaft holding clamp of the present utility model.

[0022] Figure 3 It is a schematic internal structural diagram of the whole of the present utility model.

[0023] Figure 4 For the present utility model Figure 3 The enlarged structural diagram at position A.

[0024] Figure 5 It is a schematic structural diagram of the assembly of the dynamic ring and the rubber ring of the present utility model.

[0025] In the figure: 1, main shaft; 2, moving ring; 3, stationary ring; 301, reinforcing rib; 302, lip ring; 303, assembly chamber; 304, spring coil; 305, oil seal chamber; 4, shaft holding clamp; 401, assembly cylinder; 402, connecting plate; 403, fixing hole; 404, threaded hole; 405, setscrew; 5, rubber ring seat. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment: As Figures 1-5 shown, the present invention provides a mechanical seal structure for a stirrer, including a main shaft 1. A moving ring 2 is sleeved on the surface of the main shaft 1, and a stationary ring 3 is sleeved on the surface of the moving ring 2. A shaft holding clamp 4 for preventing the moving ring 2 from axially moving is arranged at the top of the moving ring 2. The shaft holding clamp 4 is sleeved on the surface of the main shaft 1, and the bottom of the shaft holding clamp 4 contacts the moving ring 2. A rubber ring seat 5 for keeping the stationary ring 3 concentric with the main shaft 1 is sleeved on the surface of the stationary ring 3. The axes of the main shaft 1, the moving ring 2, the stationary ring 3, and the rubber ring seat 5 coincide, achieving effective sealing and improving the service life of the equipment. The sealing device ensures the stability of the sealing performance through the reinforcing ribs 301 and the spring coil 304 inside the stationary ring 3, as well as the liquid film in the oil seal chamber 305. At the same time, the design of the rubber ring seat 5 and the shaft holding clamp 4 optimizes the concentricity between the stationary ring 3 and the main shaft 1, thereby reducing the axial and radial deviations, and reducing the maintenance difficulty and operation risk.

[0028] Among them, reinforcing ribs 301 for enhancing the structural strength of the stationary ring 3 itself are filled inside the stationary ring 3. A plurality of reinforcing ribs 301 are evenly distributed around the axis of the stationary ring 3. Lip rings 302 for contacting the moving ring 2 are fixedly connected to the upper and lower sides of the inner ring wall of the stationary ring 3. The two lip rings 302 are symmetrically distributed along the middle of the stationary ring 3. The inner ring wall of the lip ring 302 contacts the moving ring 2, and the outer ring wall of the moving ring 2 is rotatably connected to the lip ring 302. An oil seal chamber 305 for filling oil is provided between the two lip rings 302. An assembly chamber 303 is opened inside the stationary ring 3. The assembly chamber 303 is arranged at the outer ring of the lip ring 302. A spring coil 304 for driving the lip ring 302 to closely adhere to the moving ring 2 is arranged inside the assembly chamber 303. The spring coil 304 is sleeved inside the stationary ring 3 through the assembly chamber 303. The spring coil 304 drives the stationary ring 3 to fit with the moving ring 2. The closing force caused by the sealing fluid pressure and the elastic force of the elastic element maintains an extremely thin liquid film in the oil chamber between the two lip rings 302 to achieve sealing.

[0029] At the same time, a bearing housing clamp 4 is provided, which includes two assembly cylinders 401. The two assembly cylinders 401 are in contact with each other and sleeved on the surface of the main shaft 1. The bottom of the assembly cylinder 401 is in contact with the moving ring 2. Connecting plates 402 are fixedly connected to both sides of the two assembly cylinders 401. The connecting plates 402 on both sides are symmetrically distributed along the axis of the assembly cylinder 401. Fixing holes 403 for installing bolts are formed on the surface of the connecting plate 402. Threaded holes 404 penetrating through the assembly cylinder 401 are formed on the surface of the assembly cylinder 401. A plurality of threaded holes 404 are evenly distributed around the axis of the main shaft 1. Set screws 405 are arranged in the threaded holes 404. The set screws 405 are threadedly connected to the assembly cylinder 401 through the threaded holes 404. One end of the set screw 405 located inside the assembly cylinder 401 is in contact with the main shaft 1. The new bearing housing clamp 4 has multiple additional set screws 405 radially, so that it fits tightly with the shaft, preventing the moving ring 2 seat from moving upward, and can quickly and efficiently repair the mechanical seal performance of the agitator, resume production, and extend the service life of the mechanical seal.

[0030] Furthermore, a rubber ring seat 5 is sleeved on the outer wall of the stationary ring 3. The inner wall of the rubber ring seat 5 is fixedly connected to the stationary ring 3. The outer wall of the rubber ring seat 5 is in contact with and fixedly connected to the agitator support. A flexible connection of the rubber ring seat 5 that can swing with the shaft is added between the stationary ring 3 and the reaction kettle, raising the position of the stationary ring 3 so that the stationary ring 3 can be fixed to the support. The connection effectively buffers the radial load and axial deviation caused by the shaft operation to the mechanical seal, avoids the misalignment of the mechanical seal, and after improving the working surface, the particulate matter in the reaction kettle is not easily introduced into the mechanical seal chamber. There is no need to use fire to correct the support for concentricity, and the maintenance personnel do not need to drill under the support, making it easier to handle emergencies and reducing the operation risk.

[0031] Working principle: When using this device, remove the mechanical seal to be repaired, clean the flange of the reaction kettle with alcohol or acetone solution, and use fine-grit sandpaper to completely remove the corrosion layer until the metallic luster is exposed. Determine the size of the flange of the reaction kettle, measure the distance from the flange of the reaction kettle to the stirrer support, and a position for installing the mechanical seal needs to be reserved. When the stirrer shaft is running, the radial load and axial deviation are relatively large, and the internal medium of the reaction kettle is corrosive. Therefore, the connecting material is selected as rubber. Rubber has good wear resistance, acid and alkali resistance, high elasticity, tear strength and elongation rate, and can better buffer the load during the operation of the stirrer. It is a very important corrosion-resistant non-metallic material in the industrial field. Measure the diameter of the stirrer shaft, and determine the thickness, outer diameter of the shaft-holding clamp 4, and the size and quantity of the setscrews 405 so that it can fit tightly with the stirrer shaft and be fixed appropriately. Considering the service environment of the shaft-holding clamp 4, it should have a certain degree of corrosion resistance. Since the shaft-holding clamp 4 also needs to bear a certain axial load, it should have a certain tensile strength and hardness. Therefore, stainless steel is selected. The rubber texture is relatively soft, and the flange connected by bolts is likely to come off after being pressed. Therefore, a metal flange pressing plate with DN250 is selected for pressing. To ensure the connection perpendicularity, the same torque should be used when tightening the flange and the cross-tightening method should be adopted. After the transformation, the dynamic and static rings 3 of the mechanical seal are fixed to the stirrer support. At the same time, the lower end of the mechanical seal is fixed to the connection through the flange pressing plate with bolts. Before installation, each contact surface should be cleaned with alcohol or acetone solution, and keep it clean during the installation process. A small amount of lubricating silicone grease can be applied to the end faces of the dynamic and static rings 3. When manufacturing, the shaft-holding clamp 4 should be divided into two semi-circles with an inner diameter of 73.8 mm for easy installation. The two semi-circles are connected with screws with a diameter of M6. Two threaded holes 404 with a diameter of M6 are drilled axially and radially on each semi-circle. The setscrew 405 is used to limit the displacement of the mechanical seal and can also play a role in adjusting the compression amount of the mechanical seal. Before installation, check the roughness of the contact surface of the shaft-holding clamp 4, clean the burrs and clean it with alcohol or acetone solution. Measure the total compression amount of the mechanical seal, and reasonably adjust the compression amount of the mechanical seal through the setscrew 405 on the shaft-holding clamp 4 in the axial direction. After adjustment, tighten the locknut on the setscrew 405 to fix the setscrew 405.

[0032] Obviously, those skilled in the art can make various modifications and variations to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model is also intended to include these modifications and variations.

Claims

1. A mechanical sealing structure of an agitator, characterized in that: The invention comprises a main shaft (1), a moving ring (2) is sleeved on the surface of the main shaft (1), a stationary ring (3) is sleeved on the surface of the moving ring (2), a shaft clamp (4) is arranged on the top of the moving ring (2) for preventing the moving ring from axial movement, the shaft clamp (4) is sleeved on the surface of the main shaft (1), the bottom of the shaft clamp (4) is in contact with the moving ring (2), a rubber ring seat (5) is sleeved on the surface of the stationary ring (3) for keeping the moving ring and the main shaft (1) concentric, the interior of the stationary ring (3) is filled with reinforcing ribs (301) for enhancing the structural strength, lip rings (302) for contacting the moving ring (2) are fixedly connected on the upper and lower sides of the inner ring wall of the stationary ring (3), an oil seal chamber (305) for filling oil is provided between the two lip rings (302), an assembly chamber (303) is provided inside the stationary ring (3), and the The assembly chamber (303) contains a spring ring (304) for driving the lip ring (302) to be in close contact with the dynamic ring (2); the spring ring (304) is sleeved inside the static ring (3) through the assembly chamber (303); the shaft clamp (4) comprises two assembly cylinders (401); the two assembly cylinders (401) are in contact with each other and sleeved on the surface of the main shaft (1); the surface of the assembly cylinder (401) is provided with a threaded hole (404) penetrating through the assembly cylinder; the threaded hole (404) contains a top screw (405); one end of the top screw (405) located inside the assembly cylinder (401) contacts the main shaft (1); the outer ring wall of the static ring (3) is sleeved with a rubber ring seat (5); the inner ring wall of the rubber ring seat (5) is fixedly connected to the static ring (3); the outer ring wall of the rubber ring seat (5) contacts and is fixedly connected to the agitator support.

2. The mechanical seal structure of a stirrer according to claim 1, characterized in that: The axes of the main shaft (1), the dynamic ring (2), the static ring (3) and the rubber ring seat (5) coincide with each other.

3. The mechanical seal structure of a stirrer according to claim 1, characterized in that: The plurality of reinforcing ribs (301) are evenly distributed around the axis of the stationary ring (3), and the assembly chamber (303) is arranged at the outer ring of the lip ring (302).

4. The mechanical seal structure of a stirrer according to claim 1, characterized in that: The lip rings (302) on both sides are symmetrically distributed along the middle of the stationary ring (3).

5. The mechanical seal structure of a stirrer according to claim 1, characterized in that: The inner ring wall of the lip ring (302) is in contact with the moving ring (2), and the outer ring wall of the moving ring (2) is rotatably connected to the lip ring (302).

6. The mechanical seal structure of a stirrer according to claim 1, characterized in that: The bottom of the assembly cylinder (401) is in contact with the moving ring (2), and connecting plates (402) are fixedly connected to both sides of the two assembly cylinders (401).

7. The mechanical seal structure of a stirrer according to claim 6, characterized in that: The connecting plates (402) on both sides are symmetrically distributed along the axis of the assembly tube (401), and fixing holes (403) for installing bolts are provided on the surfaces of the connecting plates (402).

8. The mechanical seal structure of a stirrer according to claim 1, characterized in that: The plurality of threaded holes (404) are evenly distributed around the axis of the main shaft (1), and the top screw (405) is threadedly connected to the assembly cylinder (401) via the threaded holes (404).

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