An online replacement device for dynamic sealing mechanism of tank

Abstract

The present invention discloses an online replacement device for a dynamic sealing mechanism of a tank body, which solves the technical problem that the prior art requires stopping production to replace the dynamic sealing mechanism, causing the entire production line of the enterprise to stop, thereby causing downtime losses. The present invention includes a sealing seat, a stirring shaft clearance hole is provided in the sealing seat, a sealing cavity is provided on the upper part of the stirring shaft clearance hole, a stirring shaft sealing plate located in the sealing cavity is provided on the stirring shaft, a shaft clamp for limiting the stirring shaft sealing plate is provided in the sealing cavity, and an O-type sealing ring is provided on the bottom surface of the sealing cavity to cooperate with the stirring shaft sealing plate to seal the stirring shaft clearance hole. The present invention can replace the dynamic sealing mechanism on the stirring tank (kettle) equipment under online working conditions, which can effectively prevent the replacement of the dynamic sealing mechanism under the production suspension condition as in the traditional way from causing production suspension losses to the enterprise, improve the replacement efficiency of the dynamic sealing mechanism, and at the same time eliminate the safety hazards caused by insufficient replacement of the medium in the tank when replacing the dynamic sealing mechanism as in the traditional way.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical industry, light industry and smelting machinery, and in particular relates to an online replacement device for a dynamic sealing mechanism of a tank body. Background Art

[0002] Mixing tank (kettle) equipment is widely used in modern industries such as chemical industry, light industry, smelting, medicine and other industries. Since the mixing tank equipment has a tank body and a stirring mechanism, when any of the pressure, temperature and medium characteristics reach a dangerous value under most working conditions, it is necessary to design a dynamic sealing mechanism between the tank body and the stirring shaft system. The dynamic sealing mechanism is divided into packing seal, mechanical seal, magnetic seal, magnetic flow seal and other methods. The main function of the seal is to overcome the following defects during the transmission of the stirring shaft:

[0003] (1) Prevent pressurized, high-temperature, highly toxic, and flammable gases in the tank from entering the atmosphere and causing harm;

[0004] (2) Prevent air from entering the tank and reacting with the medium in the tank, causing medium failure, explosion and other hazards.

[0005] Based on the role of the dynamic sealing mechanism, the dynamic sealing mechanism is generally a wearing part in the design of the mixing tank. Depending on the working conditions, the degree of advancement of the design, the precision control of processing and assembly, etc., the service life of the dynamic sealing mechanism usually ranges from one to five years. Therefore, the dynamic seal of the mixing tank (kettle) equipment is usually replaced every one to five years during operation. When replacing the dynamic sealing mechanism of the mixing tank (kettle) equipment in the traditional way, the mixing tank (kettle) equipment must be stopped, the pressure is relieved, the material is discharged, and the gas in the tank is replaced before the dynamic sealing mechanism of the mixing tank (kettle) equipment can be replaced. This method has the following defects:

[0006] (1) The shutdown of the mixing tank (kettle) equipment will cause the entire production line to shut down in many industries, causing huge losses to the company;

[0007] (2) The time and cost of replacing the dynamic seal mechanism are increased during the parking, pressure control, material discharge and replacement of the mixing tank (kettle) equipment. The efficiency of dynamic seal replacement is low, which affects the production progress.

[0008] (3) If the medium in the mixing tank (kettle) equipment is not fully replaced, it may cause a safety accident and pose a safety hazard.

[0009] Therefore, an online replacement device for the dynamic sealing mechanism of the tank body is designed to replace the dynamic sealing mechanism on the mixing tank (kettle) equipment under online conditions, so as to prevent the replacement of the dynamic sealing mechanism under shutdown conditions as in the traditional way, which will cause production losses to the enterprise, improve the replacement efficiency of the dynamic sealing mechanism, and at the same time eliminate the safety hazards caused by insufficient replacement of the medium in the tank when replacing the dynamic sealing mechanism in the traditional way. This has become a technical problem that needs to be urgently solved by technicians in the relevant technical field. Summary of the invention

[0010] The technical problem to be solved by the present invention is to provide an online replacement device for a dynamic sealing mechanism of a tank body, so as to solve the technical problem that the prior art requires production suspension to replace the dynamic sealing mechanism, resulting in shutdown of the entire production line of the enterprise and causing shutdown losses.

[0011] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0012] An online replacement device for a dynamic sealing mechanism of a tank body comprises a sealing seat, the sealing seat is sealingly installed on the tank body, and a dynamic sealing mechanism for sealing the tank body and a stirring shaft, a stirring shaft clearance hole is provided in the sealing seat, the stirring shaft is inserted into the stirring shaft clearance hole, a sealing cavity is provided on the upper part of the stirring shaft clearance hole, a stirring shaft sealing plate located in the sealing cavity is provided on the stirring shaft, a shaft clamp for limiting the stirring shaft sealing plate is provided in the sealing cavity, and an O-type sealing ring is provided on the bottom surface of the sealing cavity for cooperating with the stirring shaft sealing plate to seal the stirring shaft clearance hole.

[0013] Furthermore, a sealing ring clamping groove matching the O-ring is provided on the bottom surface of the sealing cavity, and the O-ring is clamped in the sealing ring clamping groove.

[0014] Furthermore, the bottom of the sealing ring mounting groove is connected to a static sealing power channel for injecting a high-pressure sealing liquid medium into the sealing ring mounting groove.

[0015] Furthermore, the sealing cavity is connected to a cleaning liquid injection channel for injecting cleaning liquid into the sealing cavity.

[0016] Furthermore, a heat exchange medium cavity for injecting a heat exchange medium to perform heat exchange with the O-ring is provided in the sealing seat, and the heat exchange medium cavity is distributed close to the O-ring.

[0017] Furthermore, the heat exchange medium cavity is connected to a heat exchange medium injection channel.

[0018] Furthermore, the stirring shaft sealing plate is annular, and at least two limiting protrusions are evenly distributed on its outer edge, and the shaft clamp is provided with a shaft clamp yielding groove that matches the limiting protrusions.

[0019] Furthermore, the sealing seat and the tank body are an integrated structure, and the dynamic sealing mechanism and the sealing seat are detachably connected by bolts.

[0020] Furthermore, the sealed cavity is connected to a pressure detection device, and the pressure detection device includes a pipeline communicating with the sealed cavity and a barometer arranged on the pipeline.

[0021] Furthermore, the pipeline is connected with a pressure detection tube and a pressure relief tube through a tee, the pressure detection tube is provided with a stop valve and a pressure gauge along the airflow direction, the pressure relief tube is provided with a pressure relief valve and a flange along the airflow direction, and the flange is matched with a flange blind plate.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention has a simple structure, a scientific and reasonable design, and is easy to use. It can replace the dynamic sealing mechanism on the mixing tank (kettle) equipment under online conditions, and can effectively prevent the replacement of the dynamic sealing mechanism under shutdown conditions as in the traditional way from causing production stoppage losses to the enterprise, thereby improving the replacement efficiency of the dynamic sealing mechanism and eliminating the potential safety hazards caused by insufficient replacement of the medium in the tank when replacing the dynamic sealing mechanism as in the traditional way.

[0024] The present invention comprises a sealing seat which is mainly sealed and installed between a tank body and a dynamic sealing mechanism, a stirring shaft yielding hole is arranged in the sealing seat, the stirring shaft is passed through the stirring shaft yielding hole, a sealing cavity is arranged on the upper part of the stirring shaft yielding hole, a stirring shaft sealing plate is arranged on the stirring shaft, the stirring shaft and the stirring shaft sealing plate are an integrated structure, or the stirring shaft sealing plate is sealed and fixed on the stirring shaft in an interference fit manner, a shaft clamp is arranged in the sealing cavity, at least two limiting protrusions are equidistantly distributed on the outer periphery of the stirring shaft sealing plate, a shaft clamp yielding groove which matches with the limiting protrusion is arranged on the shaft clamp, a sealing ring clamping groove is arranged on the bottom surface of the sealing cavity, an O-ring is sealed and clamped in the sealing ring clamping groove, the top surface of the O-ring is a plane, and is installed in the sealing ring clamping groove in a horizontal manner, the bottom of the O-ring is an inverted V-shaped structure which is concave inwards, and when the dynamic sealing mechanism is normal, the shaft clamp is located in the stirring shaft Between the mixing shaft sealing plate and the O-ring, when the dynamic sealing mechanism needs to be replaced, the staff uses external force to move the mixing shaft into the tank body. At this time, the limiting protrusion on the mixing shaft sealing plate is aligned with the shaft clamp clearance groove on the shaft clamp, and the limiting protrusion passes through the shaft clamp clearance groove. The mixing shaft sealing plate sinks with the mixing shaft to between the shaft clamp and the O-ring, and then the mixing shaft is rotated by a certain angle (for example: 30°, 45°, or 60°) to make the limiting protrusion on the mixing shaft sealing plate misaligned with the shaft clamp clearance groove, so that the shaft clamp can limit the mixing shaft sealing plate between the shaft clamp and the O-ring. At this time, the bottom surface of the mixing shaft sealing plate fits with the top surface of the O-ring, and the mixing shaft sealing plate and the O-ring cooperate to form a seal on the mixing shaft clearance hole. At this time, the bolts can be removed to replace the pressure detection device. When the replacement is completed, rotate the agitator shaft to align the limit protrusion with the shaft clamp's clearance groove. The staff uses external force to move the agitator shaft outward so that the agitator shaft sealing plate moves to the outside of the shaft clamp. At this time, the newly replaced dynamic sealing mechanism performs the sealing function.

[0025] Compared with the traditional shutdown method to replace the dynamic sealing mechanism, the device of the present invention can be used to replace the dynamic sealing mechanism online without stopping production, thus avoiding production stoppage losses and having high replacement efficiency. At the same time, there is no need to control pressure, discharge materials and replace the medium in the mixing tank (kettle), which can effectively eliminate the safety hazards formed during the control pressure, discharge materials and medium replacement process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention.

[0027] Figure 2 for Figure 1 AA cross-section diagram in.

[0028] Figure 3 This is a state diagram when the stirring shaft clearance hole of the present invention is sealed.

[0029] Figure 4 for Figure 3 BB cross-section diagram.

[0030] Figure 5 It is a schematic diagram of the structure of the pressure detection device of the present invention.

[0031] Figure 6 It is a cross-sectional schematic diagram of the O-type sealing ring of the present invention.

[0032] Figure 7 Schematic diagram of the stirring shaft of the present invention.

[0033] Figure 8 It is a partial enlarged view of the present invention.

[0034] The names corresponding to the reference numerals are:

[0035] 1-sealing seat, 2-pressure detection device, 3-stirring shaft sealing plate, 4-stirring shaft, 5-static sealing power channel, 6-heat exchange medium injection channel, 7-heat exchange medium cavity, 8-cleaning liquid injection channel, 9-bolt, 10-dynamic sealing mechanism, 11-tank body, 12-stirring shaft clearance hole, 13-sealing cavity, 14-shaft clamp, 15-O-type sealing ring, 16-sealing ring clamping groove, 17-limiting protrusion, 18-shaft clamp clearance groove, 19-pipeline, 20-barometer, 21-pressure detection tube, 22-pressure relief tube, 23-stop valve, 24-pressure relief valve, 25-flange, 26-flange blind plate, 27-heat exchange medium discharge channel. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore they cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; of course, it can also be a mechanical connection or an electrical connection; in addition, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] like Figure 1-8 As shown, the present invention provides an online replacement device for the dynamic sealing mechanism of a tank body, which has a simple structure, scientific and reasonable design, and is easy to use. The dynamic sealing mechanism on the stirring tank (kettle) equipment can be replaced under online conditions, which can effectively prevent the replacement of the dynamic sealing mechanism under shutdown conditions like the traditional method from causing production losses to the enterprise, improve the replacement efficiency of the dynamic sealing mechanism, and at the same time eliminate the safety hazards caused by insufficient replacement of the medium in the tank when replacing the dynamic sealing mechanism like the traditional method. The present invention includes a sealing seat 1, which is sealingly installed between a tank body 11 and a dynamic sealing mechanism 10 for sealing the tank body 11 and a stirring shaft 4. A stirring shaft clearance hole 12 is provided in the sealing seat 1, and the stirring shaft 4 is inserted into the stirring shaft clearance hole 12. A sealing cavity 13 is provided on the upper part of the stirring shaft clearance hole 12. A stirring shaft sealing plate 3 located in the sealing cavity 13 is provided on the stirring shaft 4. A shaft clamp 14 for limiting the stirring shaft sealing plate 3 is provided in the sealing cavity 13. An O-type sealing ring 15 is provided on the bottom surface of the sealing cavity 13 to cooperate with the stirring shaft sealing plate 3 to seal the stirring shaft clearance hole 12. A sealing ring clamping groove 16 matching the O-type sealing ring 15 is provided on the bottom surface of the sealing cavity 13, and the O-type sealing ring 15 is clamped in the sealing ring clamping groove 16. The stirring shaft sealing plate 3 is annular, and at least two limiting protrusions 17 are evenly distributed on its outer edge, and the shaft clamp 14 is provided with a shaft clamp clearance groove 18 that matches the limiting protrusions 17. The sealing seat 1 and the tank body 11 are an integrated structure, and the dynamic sealing mechanism 10 is detachably connected to the sealing seat 1 by bolts 9.

[0040] The present invention comprises a sealing seat which is mainly sealed and installed between a tank body and a dynamic sealing mechanism, a stirring shaft yielding hole is arranged in the sealing seat, the stirring shaft is passed through the stirring shaft yielding hole, a sealing cavity is arranged on the upper part of the stirring shaft yielding hole, a stirring shaft sealing plate is arranged on the stirring shaft, the stirring shaft and the stirring shaft sealing plate are an integrated structure, or the stirring shaft sealing plate is sealed and fixed on the stirring shaft in an interference fit manner, a shaft clamp is arranged in the sealing cavity, at least two limiting protrusions are equidistantly distributed on the outer periphery of the stirring shaft sealing plate, a shaft clamp yielding groove which matches with the limiting protrusion is arranged on the shaft clamp, a sealing ring clamping groove is arranged on the bottom surface of the sealing cavity, an O-ring is sealed and clamped in the sealing ring clamping groove, the top surface of the O-ring is a plane, and is installed in the sealing ring clamping groove in a horizontal manner, the bottom of the O-ring is an inverted V-shaped structure which is concave inwards, and when the dynamic sealing mechanism is normal, the shaft clamp is located in the stirring shaft Between the mixing shaft sealing plate and the O-ring, when the dynamic sealing mechanism needs to be replaced, the staff uses external force to move the mixing shaft into the tank body. At this time, the limiting protrusion on the mixing shaft sealing plate is aligned with the shaft clamp clearance groove on the shaft clamp, and the limiting protrusion passes through the shaft clamp clearance groove. The mixing shaft sealing plate sinks with the mixing shaft to between the shaft clamp and the O-ring, and then the mixing shaft is rotated by a certain angle (for example: 30°, 45°, or 60°) to make the limiting protrusion on the mixing shaft sealing plate misaligned with the shaft clamp clearance groove, so that the shaft clamp can limit the mixing shaft sealing plate between the shaft clamp and the O-ring. At this time, the bottom surface of the mixing shaft sealing plate fits with the top surface of the O-ring, and the mixing shaft sealing plate and the O-ring cooperate to form a seal on the mixing shaft clearance hole. At this time, the bolts can be removed to replace the pressure detection device. When the replacement is completed, rotate the agitator shaft to align the limit protrusion with the shaft clamp's clearance groove. The staff uses external force to move the agitator shaft outward so that the agitator shaft sealing plate moves to the outside of the shaft clamp. At this time, the newly replaced dynamic sealing mechanism performs the sealing function.

[0041] Compared with the traditional shutdown method to replace the dynamic sealing mechanism, the device of the present invention can be used to replace the dynamic sealing mechanism online without stopping production, thus avoiding production stoppage losses and having high replacement efficiency. At the same time, there is no need to control pressure, discharge materials and replace the medium in the mixing tank (kettle), which can effectively eliminate the safety hazards formed during the control pressure, discharge materials and medium replacement process.

[0042] The sealing cavity 13 of the present invention is connected with a cleaning liquid injection channel 8 for injecting cleaning liquid into the sealing cavity 13. Before the staff moves the stirring shaft to make the stirring shaft sealing plate and the O-type sealing ring fit and seal, they first inject cleaning liquid into the sealing cavity 13 through the cleaning liquid injection channel 8 to clean the cavity wall of the sealing cavity, especially the bottom surface of the sealing cavity and the top surface of the O-type sealing ring, so that the sealing performance is better when the stirring shaft sealing plate and the O-type sealing ring fit. The cleaning liquid injection channel 8 is connected to the outside world, and is sealed by a seal under normal circumstances. It is opened only when it is necessary to inject cleaning liquid into the sealing cavity 13.

[0043] The bottom of the sealing ring mounting groove 16 of the present invention is connected with a static sealing power channel 5 for injecting a high-pressure sealing liquid medium into the sealing ring mounting groove 16. When the worker moves the agitator shaft to make the agitator shaft sealing plate and the O-ring fit and seal, the high-pressure sealing liquid medium is injected into the sealing ring mounting groove through the static sealing power channel 5. The high-pressure sealing liquid medium can push against the O-ring to make it more closely fit the agitator shaft sealing plate, which can effectively enhance the sealing performance between the agitator shaft sealing plate and the O-ring.

[0044] The sealing seat 1 of the present invention is provided with a heat exchange medium cavity 7 for injecting heat exchange medium to exchange heat with the O-type sealing ring 15, and the heat exchange medium cavity 7 is distributed close to the O-type sealing ring 15. The heat exchange medium cavity 7 is connected with a heat exchange medium injection channel 6. The medium in the tank produced by most enterprises has a certain temperature. In order to eliminate the influence of temperature on the sealing performance of the O-type sealing ring, the heat exchange medium is injected into the heat exchange medium cavity 7 through the heat exchange medium injection channel 6, and heat exchange is formed between the heat exchange medium and the O-type sealing ring, so that the sealing performance of the O-type sealing ring is maintained in the best state, which can effectively enhance the sealing performance between the stirring shaft sealing plate and the O-type sealing ring. The heat exchange medium cavity 7 is distributed around the sealing ring clamping groove, one side of which is connected with the heat exchange medium injection channel 6, and the other side is connected with the heat exchange medium discharge channel 27. The heat exchange medium circulates in the heat exchange medium cavity 7, which can effectively improve the heat exchange between the heat exchange medium and the O-type sealing ring.

[0045] The sealed cavity 13 of the present invention is connected with a pressure detection device 2, and the pressure detection device 2 includes a pipeline 19 connected to the sealed cavity 13, and a barometer 20 arranged on the pipeline 19. The pipeline 19 is connected with a pressure detection pipe 21 and a pressure relief pipe 22 through a tee, and a stop valve 23 and a barometer 20 are arranged on the pressure detection pipe 21 along the airflow direction, and a pressure relief valve 24 and a flange 25 are arranged on the pressure relief pipe 22 along the airflow direction, and a flange blind plate 26 is matched on the flange 25. The pressure detection device 2 can effectively detect whether the sealing between the stirring shaft sealing plate and the O-ring is completed. When the dynamic sealing mechanism is in normal use, the pressure detection device 2 is used to detect the pressure in the sealing chamber 13; when the dynamic sealing mechanism is replaced online, after the agitator shaft sealing plate and the O-ring form a seal, the pressure detection device 2 detects the air pressure in the sealing chamber 13. When the detected air pressure is normal pressure, the agitator shaft sealing plate and the O-ring form a good seal, and the dynamic sealing mechanism can be replaced. If the air pressure in the sealing chamber 13 is detected to be higher than normal pressure, it can be determined that the seal between the agitator shaft sealing plate and the O-ring is not tight, resulting in the pressure leakage in the tank body. At this time, the sealing performance of the device of the present invention needs to be inspected. The pressure detection device is provided with a pressure relief pipe, a pressure relief valve, and mutually matching flanges and flange blind plates, which are used to relieve the pressure of the sealing chamber through the flange external pressure relief equipment.

[0046] The shaft clamp of the present invention is used to limit the sealing plate of the stirring shaft to prevent the stirring shaft from rushing out due to excessive pressure in the tank body.

[0047] When the dynamic sealing mechanism of the present invention is used normally, due to the pressure inside the tank body, the O-type sealing ring is in the sealing cavity 13 and returns to the sealing ring clamping groove under the action of the pressure inside the tank body.

[0048] When the dynamic sealing mechanism is replaced, the device of the present invention can block the passage between the tank body and the outside world, so that when the dynamic sealing mechanism of the tank body is replaced, the material in the tank body does not need to be discharged, the pressure in the tank body does not need to be released, and the temperature in the tank body does not need to be lowered. The safety risk when the dynamic sealing mechanism of the tank body is replaced is reduced, the replacement efficiency of the dynamic sealing mechanism is improved, the parking time caused by replacing the dynamic sealing mechanism is shortened, and the production is indirectly increased and the benefits are improved.

[0049] When the tank body of the present invention works normally, the agitator shaft sealing plate is located at the upper part of the sealing cavity, and the medium characteristics (including pressure, temperature, and corrosion performance) in the tank body are in direct contact with the dynamic sealing mechanism. The dynamic sealing mechanism plays a normal sealing role. At this time, the O-ring moves down and returns to the sealing ring mounting groove under the action of the medium pressure in the tank body. When the dynamic sealing mechanism needs to be replaced, first, the cleaning liquid injection channel is opened, and the cleaning liquid enters the sealing cavity to clean the materials accumulated on the sealing surface of the bottom surface of the sealing cavity; then, the maintenance personnel move the agitator shaft into the tank body from the outside of the tank body, so that the agitator shaft sealing plate passes through the shaft clamp and fits with the O-ring to form a seal, and then the static sealing power channel is opened, and the sealing liquid enters the sealing ring mounting groove, prompting the O-ring to move up to support the agitator shaft sealing plate to ensure a good sealing effect. According to the medium pressure in the tank body, the width of the O-ring is adjusted.

[0050] The invention has a simple structure, a scientific and reasonable design, and is easy to use. The dynamic sealing mechanism on the stirring tank (kettle) equipment can be replaced online. The invention has strong practicability and is suitable for vigorous promotion and application in the technical field.

[0051] Finally, it should be noted that the above embodiments are only preferred embodiments of the present invention to illustrate the technical solutions of the present invention, rather than limiting them, and certainly not limiting the patent scope of the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. In other words, any changes or modifications made to the main design concept and spirit of the present invention that have no substantive significance, and the technical problems they solve are still consistent with the present invention, should be included in the protection scope of the present invention. In addition, the direct or indirect application of the technical solutions of the present invention in other related technical fields is also included in the patent protection scope of the present invention.

Claims

1. An online replacement device for a tank dynamic sealing mechanism, characterized in that: The invention comprises a sealing seat (1), the sealing seat (1) being sealingly mounted between a tank body (11) and a dynamic sealing mechanism (10) for sealing the tank body (11) and a stirring shaft (4); a stirring shaft clearance hole (12) being arranged in the sealing seat (1); the stirring shaft (4) being inserted into the stirring shaft clearance hole (12); a sealing cavity (13) being arranged above the stirring shaft clearance hole (12); a stirring shaft sealing plate (3) being arranged on the stirring shaft (4) and being arranged in the sealing cavity (13); a shaft clamp (14) being arranged in the sealing cavity (13) for limiting the position of the stirring shaft sealing plate (3); and a shaft clamp (14) being arranged on the bottom surface of the sealing cavity (13) and cooperating with the stirring shaft sealing plate (3) for limiting the position of the stirring shaft clearance hole (12). The agitator shaft sealing plate (3) is annular, and at least two limiting protrusions (17) are evenly distributed on its outer edge, and the shaft clamp (14) is provided with a shaft clamp clearance groove (18) that matches the limiting protrusions (17); the bottom surface of the sealing cavity (13) is provided with a sealing ring clamping groove (16) that matches the O-ring (15), and the O-ring (15) is clamped in the sealing ring clamping groove (16); the sealing cavity (13) is connected to a pressure detection device (2), and the pressure detection device (2) includes a pipeline (19) connected to the sealing cavity (13), and a barometer (20) arranged on the pipeline (19).

2. The online replacement device for the dynamic sealing mechanism of a tank according to claim 1 is characterized in that: The bottom of the sealing ring mounting groove (16) is connected to a static sealing power channel (5) for injecting a high-pressure sealing liquid medium into the sealing ring mounting groove (16).

3. The online replacement device for the dynamic sealing mechanism of a tank according to claim 1 is characterized in that: The sealing cavity (13) is connected to a cleaning liquid injection channel (8) for injecting cleaning liquid into the sealing cavity (13).

4. The online replacement device for the dynamic sealing mechanism of a tank according to claim 1 is characterized in that: A heat exchange medium cavity (7) for injecting a heat exchange medium to perform heat exchange with the O-ring (15) is provided in the sealing seat (1), and the heat exchange medium cavity (7) is distributed close to the O-ring (15).

5. The online replacement device for the dynamic sealing mechanism of a tank body according to claim 4 is characterized in that: The heat exchange medium cavity (7) is connected to a heat exchange medium injection channel (6).

6. The online replacement device for the dynamic sealing mechanism of a tank body according to claim 1, characterized in that: The sealing seat (1) and the tank body (11) are an integrated structure, and the dynamic sealing mechanism (10) and the sealing seat (1) are detachably connected via bolts (9).

7. The online replacement device for the dynamic sealing mechanism of a tank body according to claim 1 is characterized in that: The pipeline (19) is connected to a pressure detection pipe (21) and a pressure relief pipe (22) through a tee. A stop valve (23) and a barometer (20) are provided on the pressure detection pipe (21) along the airflow direction. A pressure relief valve (24) and a flange (25) are provided on the pressure relief pipe (22) along the airflow direction. A flange blind plate (26) is matched on the flange (25).

Images