Device for sealing bottom of reaction kettle by using reaction liquid in cooperation with gas

Abstract

The utility model relates to the technical field of sealing of reaction kettles for liquid phase reaction, in particular to a device for sealing the bottom of a reaction kettle by utilizing reaction liquid and gas, which is characterized in that an isolation cover is arranged on a rotating shaft, an isolation cup is arranged at the bottom of the reaction kettle, and the isolation cover can be inversely buckled on the isolation cup; a liquid level adjusting space is formed between the inner wall of the isolation cover and the outer wall of the isolation cup, a gas phase space is formed between the rotating shaft and the isolation cup, and a shaft bearing box is combined, so that liquid at the bottom end of the shaft can be sealed; and meanwhile, a gas through hole is formed between the top of the isolation cup and the isolation cover, and a liquid through hole is formed between the isolation cover and the bottom of the reaction kettle. The liquid level adjusting space is arranged between the isolation hood and the isolation cup, so that reaction liquid in the reaction kettle can enter the liquid level adjusting space through the liquid through hole, and the air inlet pipe is arranged between the isolation hood and the isolation cup, so that the liquid level in the liquid level adjusting space is adjusted by inflating air through the air inlet pipe, and the purposes of supporting the rotating shaft and sealing are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing a reaction kettle using liquid phase reaction, in particular to a device for sealing the bottom of a reaction kettle by utilizing reaction liquid in coordination with gas. Background Art

[0002] Vertical containers widely used in chemical production, biopharmaceuticals and other fields involve the need to stir the reaction materials during the material mixing stage and the material reaction stage to achieve sufficient contact mixing and improve the reaction efficiency. Therefore, it is necessary to set a stirring shaft in the vertical container, and then set stirring blades on the stirring shaft. However, when setting the stirring shaft, most of them adopt the top drive method; when setting the top drive, the stirring shaft needs to be extended from the top of the container to the bottom of the container, and in order to avoid the defect that the stirring shaft swings in the container due to the bottom end of the stirring shaft not being fixed, which affects the service life, it is usually necessary to set a support assembly at the bottom end of the stirring shaft, and use a sealing treatment between the support assembly and the stirring shaft to prevent the reaction materials in the container from entering the support assembly (that is, the end of the bottom end of the stirring shaft) to damage the bearings in the support assembly, which helps to extend the service life.

[0003] At present, the supporting components provided in the prior art are mainly concentrated in the following aspects: Figure 1 He Ru Figure 2 The two methods shown are:

[0004] like Figure 1 As shown, the stirring shaft is passed through the bottom of the reactor, and then a mechanical seal is used to seal the stirring shaft and the bottom of the reactor to prevent the liquid in the reactor from leaking. Then a bearing and a bearing support box (support cover) are arranged at the bottom of the stirring shaft to support and seal the stirring shaft and the bottom of the reactor. However, this method has high requirements on the concentricity of the stirring shaft, the through hole at the bottom of the reactor through which the stirring shaft passes, and the through hole for the mechanical seal to pass through the stirring shaft, resulting in a high cost for the support and sealing treatment, and a poor sealing effect. The sealing packing (axial O-ring and / or radial O-ring, etc.) used in the mechanical seal is easily damaged by the reaction liquid and has a poor service life.

[0005] like Figure 2As shown, a support cover for supporting the stirring shaft is provided at the bottom of the reactor, a bearing is provided in the support cover, the stirring shaft is connected to the bearing, and then a sealing filler (axial O-ring and / or radial O-ring, etc.) and other sealing structures are used to seal the upper end of the bearing, so that the entire support sealing structure is located in the bottom of the reactor. This design not only has high requirements on the concentricity between the hole for setting the bearing in the support cover and the stirring shaft, but also the bearing is sealed in the support cover, so that the sealing cover and other structures need to be removed before they can be lubricated (for example, adding lubricating oil, etc.), which makes the seals, bearings, etc. very easy to be damaged, resulting in high maintenance costs.

[0006] Based on this, the research team learned through the retrieval and analysis of the existing technical literature that there are many measures for the sealing treatment between the stirring shaft and the reactor in the prior art, for example, the mechanical seal device for the top-driven kettle and its front isolation protection system disclosed in the patent application No. 201911204778.3 solves the problem that the medium in the reactor is not full or full, and a small part of the top of the stirring tank is odd, which causes the gas in the tank to react chemically due to the change of pressure or temperature during the operation of the equipment, causing the O-ring on the medium side of the mechanical seal to form solid or colloidal substances at the sliding diameter, resulting in the failure of the O-ring and the technical problem of sealing failure. At the same time, it avoids the defect of continuous filling of the isolation protection liquid into the reactor, which leads to the inability to effectively protect the O-ring on the medium side of the mechanical seal. Therefore, a baffle sleeve and a liquid level monitoring subsystem are disclosed. The baffle sleeve is installed on the chassis of the mechanical seal for the top-driven kettle. A liquid storage tank is formed between the baffle sleeve and the mechanical seal for the top-driven kettle. The liquid level height of the liquid storage tank is higher than the O-ring on the medium side at the diameter, effectively forming a liquid seal. Another example: Patent application No. 202310129041.X discloses a double-end mechanical seal structure for top stirring of gas phase crystallization, in which an isolation sleeve is provided at the lower part of the rotating shaft, and the bottom of the isolation sleeve is sealed with an O-ring and a first pressure cover, a sleeve is sleeved on the rotating shaft above the isolation sleeve, and a drive ring is sleeved on the rotating shaft above the sleeve, and a second pressure cover is matched with a clamping plate above the first pressure cover, and the second pressure cover is sleeved on the atmospheric side sealing assembly, and the atmospheric side sealing assembly cooperates with the clamping plate on the upper part of the sleeve, and the lower part of the sleeve cooperates with the dynamic O-ring on the medium side and the medium compensation ring clamping plate, etc., to solve the problem that the medium in the agitator is easily vaporized to form a gaseous medium under changes in temperature and pressure, and these gaseous media are easy to precipitate crystal particles at the contact part of the mechanical seal at the top of the agitator, which will damage the O-ring after accumulation, resulting in seal failure. It can be seen that in the prior art, a lot of research has been carried out on the sealing between the agitator shaft and the container for top-driven containers such as agitators and reactors, but there is relatively little research on the support and sealing of the agitator shaft at the bottom of the container, and it mainly focuses on such as Figure 1 He Ru Figure 2 Two support and sealing treatments are shown.

[0007] In view of this, this research team conducted research on the defects in the existing technology regarding the support and sealing treatment of the bottom end of the stirring shaft when using containers (such as stirring mixers, reactors, etc.) for reactions of liquid phase, slurry and other reaction materials. The reaction liquid (reaction slurry) was used in conjunction with the gas sealing treatment, and the support and sealing structural parts at the bottom of the reactor were improved, providing a new structure for supporting the stirring shaft and sealing the bottom of the reactor. Utility Model Content

[0008] Based on the above technical problems, the present invention provides a device for sealing the bottom of the reactor by utilizing reaction liquid and gas, so that the stirring shaft can be freely removed before starting the machine, so that after a gap is separated between the isolation cover and the isolation cup, lubricant is filled into the isolation cup to achieve lubrication of the bearing supporting the bottom of the stirring shaft, which simplifies the sealing structure, ensures the stability of the support system, helps to extend the service life of the support and sealing system structure at the bottom of the stirring shaft, and reduces maintenance costs.

[0009] The specific technical solution is:

[0010] A device for sealing the bottom of a reactor by utilizing reaction liquid and gas, comprises a reactor and a rotating shaft, wherein a through hole is provided at the bottom of the reactor for the rotating shaft to pass through; an isolation cup is provided at the bottom of the reactor, and the through hole is located in the isolation cup; an isolation cover is provided on the rotating shaft, and after the rotating shaft is in an installed state, the isolation cover can be buckled on the isolation cup, and the isolation cup is located inside the reactor; a shaft support box is provided at the bottom of the reactor, a bearing is provided in the shaft support box, and the rotating shaft passes through the through hole and is connected to the bearing; a liquid port is formed between the isolation cover and the bottom of the reactor, a gas port is formed between the isolation cover and the top of the isolation cup, an air inlet pipe is provided between the isolation cover and the isolation cup, and the top of the air inlet pipe is flush with the top of the isolation cup.

[0011] An isolation cover is provided on the rotating shaft, and an isolation cup is provided at the bottom of the reactor. The isolation cover can be turned upside down on the isolation cup, so that a liquid level adjustment space is formed between the inner wall of the isolation cover and the outer wall of the isolation cup, and a gas phase space is formed between the rotating shaft and the isolation cup. Combined with the shaft bearing box arrangement, the liquid at the bottom end of the shaft can be sealed. At the same time, an air port is formed between the top of the isolation cup and the isolation cover, and a liquid port is formed between the isolation cover and the bottom of the reactor, so that the reaction liquid (reaction slurry) in the reactor can enter the liquid level adjustment space through the liquid port. Combined with the air inlet pipe arranged between the isolation cover and the isolation cup (in the liquid level adjustment space), gas is filled in through the air inlet pipe to adjust the liquid level in the liquid level adjustment space, thereby achieving the purpose of supporting the rotating shaft and sealing.

[0012] In order to avoid leakage caused by filling gas and affecting the sealing effect, preferably, the isolation cover is sealed to the rotating shaft; the isolation cup is sealed to the reactor; and the shaft support box is sealed to the reactor. More preferably, the isolation cover and the rotating shaft adopt a seal including but not limited to one-piece molding, welding seal, O-ring axial seal, O-ring radial seal or packing seal; and / or the isolation cup and the reactor adopt a seal including but not limited to one-piece molding, welding seal, O-ring axial seal, O-ring radial seal or packing seal; and / or the shaft support box and the reactor adopt a seal including but not limited to one-piece molding, welding seal, O-ring axial seal, O-ring radial seal or packing seal.

[0013] In order to avoid the defect of leakage of liquid or slurry from the contact position between the air inlet pipe and the reactor, preferably, the air inlet pipe extends from the bottom of the reactor, and the air inlet pipe and the reactor are sealed.

[0014] In order to monitor the height change of the gas-liquid interface between the gas phase space and the liquid level adjustment space at any time, preferably, a liquid level sensor is provided between the isolation cover and the isolation cup, and the top of the liquid level sensor is lower than the top of the isolation cup.

[0015] In order to prevent the liquid or slurry from leaking at the connection position between the liquid level sensor and the reactor, preferably, the liquid level sensor extends from the bottom of the reactor, and the liquid level sensor and the reactor are sealed.

[0016] In order to facilitate the replacement and installation of the shaft support box and ensure that the shaft support box can be sealed and installed at the bottom of the reactor, preferably, a detachable connecting ring is provided in the shaft support box, the bearing is arranged in the connecting ring, and the connecting ring is integrally formed with the bottom of the reactor; a sealing assembly is provided between the connecting ring and the shaft support box.

[0017] Preferably, the detachable connection is a threaded connection or a snap-on connection; when a threaded connection is adopted, an external thread is provided on the connecting ring, and an internal thread matching the external thread is provided on the shaft support box, and the sealing assembly is formed by the external thread and the internal thread; when a snap-on connection is adopted, a sealing rubber layer is provided between the connecting ring and the shaft support box.

[0018] In order to enhance the sealing effect, preferably, a sealing rubber layer is coated on the external thread, and after the internal thread is matched and connected with the external thread, the sealing rubber layer is clamped between the connecting ring and the shaft support box.

[0019] In order to avoid overheating in the shaft support box and damage to the bearing, preferably, the outer wall of the shaft support box is provided with a plurality of heat-conducting fins.

[0020] Compared with the prior art, the technical effects created by the present invention are embodied in:

[0021] The invention has a simple structure and low manufacturing cost, is convenient for lubricating the bearings supporting the rotating shaft, and reduces maintenance costs.

[0022] The invention utilizes the air inlet pipe to inflate and adjust the pressure between the reaction liquid (reaction slurry) in the reactor and the gas contact interface in the gas phase space, and achieves the liquid level height in the liquid level adjustment space to prevent the liquid in the reactor from entering the isolation cup, so that the rotating shaft located in the isolation cover will not be corroded by the reaction liquid (reaction slurry) in the reactor, and the reaction liquid (reaction slurry) is prevented from infiltrating the bearings supporting the rotating shaft, which helps to extend the service life of the bearings, simplifies the maintenance treatment of adding lubricants to the bearings, reduces maintenance costs, and improves the sealing effect of the rotating shaft support sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to facilitate those skilled in the art to fully understand the technical solution of the present invention, the present invention is now combined with the content of the technical solution and the provided drawings, and the following description is made for the provided drawings. The directional words described in the present invention, such as: up, down, front, back, left, right, inside, outside, etc., are all descriptions made in combination with and facing the following drawings for easy understanding, and are not a limitation of the technical solution of the present invention.

[0024] Figure 1 The present invention is a schematic diagram of a supporting shaft structure installed at the bottom of a reactor in the prior art.

[0025] Figure 2 The present invention is a schematic diagram of a supporting shaft structure installed at the bottom of a reactor in the prior art.

[0026] Figure 3 The present invention is a schematic diagram of the structure of the supporting shaft installed at the bottom of the reactor.

[0027] Figure 4 for Figure 3 Another schematic diagram of the structure of the embodiment.

[0028] Figure 5 for Figure 4 Another schematic diagram of the structure of the embodiment.

[0029] Figure 6 A schematic diagram of the height structure inside the isolation cover is created for the present invention.

[0030] 1-reactor 2-reaction liquid 3-rotating shaft 4-shaft hole 5-mechanical seal 6-support cover 7-bearing 8-sealing layer 9-support cover 10-sealing ring 11-isolating cup 12-isolating cover 13-liquid level sensor 14-shaft support box 15-intake pipe 16-connecting ring 17-heat conducting fin. DETAILED DESCRIPTION

[0031] In order to facilitate those skilled in the art to correctly understand the present invention and enable those skilled in the art to fully understand the technical content of the present invention, the technical solution of the present invention is further explained below in conjunction with specific implementation methods and drawings. However, this explanation does not limit the scope of protection required for the present invention. The scope of protection of the present invention by those skilled in the art cannot be limited to the following explanations. Any equivalent substitutions or changes made by any those skilled in the art or persons familiar with the technology in the art based on the present invention and the technical solution and inventive concept thereof should be covered within the scope of protection of the present invention.

[0032] When setting a stirring assembly in the reactor 1, the prior art usually requires setting a rotating shaft 3, and the reaction liquid in the reactor 1 is driven to rotate by the rotation of the rotating shaft 3 to achieve the purpose of stirring and mixing the liquid. However, when setting the rotating shaft 3, it is usually necessary to set a supporting assembly of the rotating shaft 3 at the bottom of the reactor 1 to achieve the purpose of stabilizing the rotating shaft 3, thereby preventing the entire stirring assembly from swinging in the reactor 1 due to the unfixed bottom of the rotating shaft 3, affecting the stability of the top connection of the stirring assembly, and even causing the stirring assembly to collide with the inner wall of the reactor 1 due to the swinging in the reactor 1, causing the collision with the inner wall of the reactor 1 and damaging the reactor 1. At present, there are many ways to support the rotating shaft 3, but they can be summarized as follows: Figure 1 He Ru Figure 2 Two fixing methods.

[0033] like Figure 1 As shown, an axial hole 4 (marked as a through hole in the invention) is opened at the bottom of the reactor 1, and the rotating shaft 3 is extended from the bottom of the reactor 1 through the axial hole 4, and then a mechanical seal 5 is arranged at the bottom of the reactor 1 close to the axial hole 4 to prevent the liquid in the reactor 1 from leaking out of the axial hole 4; then a support cover 6 is arranged at the bottom of the reactor 1, and the support cover 6 covers the mechanical seal 5 inside, and a bearing 7 is arranged in the support cover 6, and the bearing 7 is connected to the rotating shaft 3, so as to support the rotating shaft 3 and seal the bottom of the reactor 1 to prevent the reaction liquid 2 from leaking into the bearing 7; however, the mechanical sealing cost of this method is high, the concentricity requirements of the rotating shaft and the axial hole 4 and the center hole of the mechanical seal 5 are high, and the processing cost is high.

[0034] like Figure 2As shown, a support cover 9 is provided at the bottom of the reactor 1, a bearing 7 is provided in the support cover 9, a sealing layer 8 is provided on the top of the support cover, and the rotating shaft 3 is connected to the bearing 7 (for example, a ceramic or composite bearing) after passing through the sealing layer 8 and the support cover 9, so as to achieve the purpose of support, and a sealing ring 10 (for example, an O-ring radial, an O-ring axial, a packing seal, a lip seal, etc.) is provided between the support cover 9 and the rotating shaft 3 to prevent the reaction liquid 2 in the reactor 1 from entering the bearing 7. However, this method causes the bearing 7 to be sealed in the support cover 9, the sealing ring 10 is easy to wear, and the bearing 7 cannot be added with lubricating oil to increase the lubrication performance (even if it is added, the disassembly and assembly costs are high), resulting in the bearing 7 being easily damaged and the maintenance cost being high.

[0035] In view of the above prior art (such as Figure 1 and Figure 2 ) The shaft support structure of the reactor 1 and the sealing structure of the bearing 7 are used in the reactor 1. The bearing support and sealing in the reactor 1 are studied and improved, and the following improvement measures are proposed:

[0036] like Figure 3-6 As shown, in some embodiments, a device for sealing the bottom of a reactor by using reaction liquid and gas to seal the bottom of the reactor comprises a reactor 1 and a rotating shaft 3, wherein a through hole is provided at the bottom of the reactor 1 for the rotating shaft 3 to pass through; an isolation cup 11 is provided at the bottom of the reactor 1, and the through hole is located in the isolation cup 11; an isolation cover 12 is provided on the rotating shaft 3, and after the rotating shaft 3 is in an installed state, the isolation cover 12 can be inverted on the isolation cup 11, and the isolation cup 11 is located inside the reactor 1; a shaft support box 14 is provided at the bottom of the reactor 1, a bearing 7 is provided in the shaft support box 14, and the rotating shaft 3 passes through the through hole and is connected to the bearing 7; a liquid port is formed between the isolation cover 12 and the bottom of the reactor 1, a gas port is formed between the isolation cover 12 and the top of the isolation cup 11, an air inlet pipe 15 is provided between the isolation cover 12 and the isolation cup 11, and the top of the air inlet pipe 15 is flush with the top of the isolation cup 11. The isolation cover 12 is sealedly connected to the rotating shaft 3 ; the isolation cup 11 is sealedly connected to the reactor 1 ; and the shaft support box 14 is sealedly connected to the reactor 1 .

[0037] During installation: after setting a through hole at the bottom of the reactor 1 and installing the isolation cup 11, set the isolation cover 12 on the rotating shaft 3, and then pass the bottom end of the rotating shaft 3 through the through hole so that the isolation cover 12 is upside down on the isolation cup 11; install the shaft support box 14 with the bearing 7 at the bottom of the reactor 1, and at the same time, install the bearing 7 at the bottom of the rotating shaft 3 so that the bearing 7 forms a supporting force on the rotating shaft 3, and then install the air inlet pipe 15 between the isolation cover 12 and the isolation cup 11 to complete the installation. During use: add reaction liquid 2 (reaction slurry) into the reactor 1 so that the reaction liquid 2 submerges the liquid port, then open the air inlet pipe 15 so that the air inlet pipe 15 continuously blows gas thereinto, so that when the gas and liquid port positions reach a gas-liquid pressure balance, continue to add reaction liquid 2 into the reactor 1, and at the same time, ensure that the gas-liquid interface between the isolation cover 12 and the isolation cup 11 is in a balanced state, and the liquid interface is lower than the top of the isolation cup 11, until the reaction liquid 2 is added to the required amount of liquid, when the addition of the reaction liquid 2 is stopped, stop blowing in the gas (or continue to blow in the gas while maintaining the liquid level balance between the isolation cover 12 and the isolation cup 11), so as to complete the support of the rotating shaft 3 and realize the bottom sealing of the reactor 1 with a through hole, and simplify the support structure and the sealing structure, so as to facilitate the lubrication of the bearing 7 after subsequent disassembly. Specifically, when lubricating the bearing 7, the rotating shaft 3 can be lifted upward when the machine is stopped, so that the isolation cup 11 is separated from the isolation cover 12, and then the lubricant or lubricating oil is directly poured into the isolation cup, so that it can flow into or penetrate into the bearing 7, thereby achieving lubrication of the bearing 7, reducing the traditional seal (such as Figure 1 and / or Figure 2 The need to disassemble the sealing structure makes maintenance difficult and reduces maintenance costs.

[0038] In some embodiments, the isolation cover 12 and the rotating shaft 3 can be sealed by integral molding, welding, O-ring axial sealing, O-ring radial sealing or packing sealing, etc.; as long as the contact connection between the isolation cover 12 and the rotating shaft 3 can prevent the gas and the liquid in the reactor 1 from leaking into the gas phase space formed by the isolation cup 11 and the rotating shaft 3. In a more excellent embodiment, the isolation cover 12 and the rotating shaft 3 are integrally molded at the contact connection position between the isolation cover 12 and the rotating shaft 3, so that the sealing performance is better. In some embodiments, the isolation cup 11 and the reactor 1 can be sealed by integral molding, welding, O-ring axial sealing, O-ring radial sealing or packing sealing, etc., as long as the contact connection position between the bottom of the isolation cup 11 and the reactor 1 can prevent gas leakage or the liquid in the reactor 1 from leaking into the gas phase space formed by the isolation cup 11 and the rotating shaft 3. In some embodiments, the shaft support box 14 and the reactor 1 use an integral molding seal, welding seal, O-ring axial seal, O-ring radial seal or packing seal.

[0039] like Figure 3-6 As shown, in some embodiments, the air inlet pipe 15 extends from the bottom of the reactor 1, and the air inlet pipe 15 is sealed and connected to the reactor 1. It improves convenience, ensures airtightness, and prevents liquid leakage. In some embodiments, the air inlet pipe 15 can be extended from the top of the reactor 1 and then extended between the isolation cover 12 and the isolation cup 11 through the liquid port. In some embodiments, the top of the air inlet pipe 15 is flush with the top of the isolation cup 11.

[0040] like Figure 3-6 As shown, in some embodiments, a liquid level sensor 13 is provided between the isolation cover 12 and the isolation cup 11, and the top of the liquid level sensor 13 is lower than the top of the isolation cup 11. The liquid level height in the liquid level adjustment space between the isolation cup 11 and the isolation cover 12 can be known at any time through the action of the liquid level sensor 13, and then it can be determined whether the liquid in the reactor 1 has entered the isolation cup 11. Combined with the fact that the top of the liquid level sensor 13 is lower than the top of the isolation cup 11, it can effectively prevent the reaction liquid 2 from entering the gas phase space formed between the isolation cup 11 and the rotating shaft 3, thereby improving the sealing effect between the reaction liquid 2 and the gas phase space. In some embodiments, after extending from the top of the reactor 1, the liquid level sensor 13 enters through the liquid port and is installed in the liquid level adjustment space between the isolation cup 11 and the isolation cover 12. As shown in FIG. Figure 3-6 As shown, in some embodiments, the liquid level sensor 13 extends from the bottom of the reactor 1, and the liquid level sensor 13 is sealed and connected to the reactor 1. The liquid level sensor 13 and the air inlet pipe 15 used in the invention can be controlled through the PLC control panel, and the liquid level sensor 13 is connected to the PLC control panel, and the valve that controls whether the air inlet pipe 15 is inlet is connected to the PLC control panel, so that when the liquid interface between the isolation cover 12 and the isolation cup 11 is close to the top of the isolation cup 11, the air inlet pipe 15 can be opened to inlet air, so as to avoid the reaction liquid 2 from entering the isolation cup 11 and improve the sealing effect. When the liquid interface between the isolation cover 12 and the isolation cup 11 is much lower than the top of the isolation cup 11, the air inlet pipe 15 is closed to inlet air, so as to avoid excessive filling of gas, which causes the liquid interface between the isolation cover 12 and the isolation cup 11 to be lower than the liquid port, resulting in gas waste.

[0041] In the invention, if a gas-liquid reaction is used, the above-mentioned sealing effect can be achieved by filling the air inlet pipe 15 with an excess of reaction gas. If gas is not required to participate in the reaction, it is better to use inert gas. In order to save costs, a compressor is usually used to blow air, which helps to reduce the cost of gas application and ensure the sealing effect.

[0042] like Figure 4-6As shown, in some embodiments, a connecting ring 16 is detachably provided in the shaft support box 14, the bearing 7 is provided in the connecting ring 16, and the connecting ring 16 is integrally formed with the bottom of the reactor 1; a sealing assembly is provided between the connecting ring 16 and the shaft support box 14. The detachable connection is a threaded connection, the connecting ring 16 is provided with an external thread, the shaft support box 14 is provided with an internal thread matching the external thread, and the external thread and the internal thread constitute the sealing assembly (not shown in the figure); the shaft support box 14 is sealed and connected to the bottom of the reactor 1, ensuring that the gas phase space formed by the isolation cup 11 and the rotating shaft 3 can be sealed, facilitating the installation, replacement and maintenance of the shaft support box 14, and also facilitating the replacement, maintenance and maintenance of the bearing 7 in the shaft support box 14. In some embodiments, a sealing layer is coated on the external thread, and the sealing layer is clamped between the connecting ring 16 and the shaft support box 14 after the internal thread matches and connects with the external thread. Ensure the sealing after the internal thread and external thread are connected, avoid air leakage and improve air tightness.

[0043] like Figure 4-6 As shown, in some embodiments, a connecting ring 16 is detachably provided in the shaft support box 14, the bearing 7 is provided in the connecting ring 16, and the connecting ring 16 is integrally formed with the bottom of the reactor 1; a sealing component is provided between the connecting ring 16 and the shaft support box 14. The detachable connection is a snap-on connection; a sealing rubber layer (not shown in the figure) is provided between the connecting ring 16 and the shaft support box 14 to improve its sealing performance.

[0044] like Figure 6 As shown, in some embodiments, the outer wall of the shaft support box 14 is provided with a plurality of heat-conducting fins 17. This helps to accelerate the heat dissipation in the shaft support box 14 and reduce the probability of heat damage to the bearing 7.

[0045] Other matters not covered by the present invention may be realized by conventional technical means with reference to the prior art or common knowledge known to those skilled in the art, for example, how to set the heat conducting fins 17, how to connect the rotating shaft 3 with the bearing 7, how to apply sealant between the external thread and the internal thread, and how to connect the rotating shaft 3 with the bearing 7. Figure 6 As shown, in certain embodiments, according to conventional technical means and known attempts, the height of the liquid port is set to L2, the height of the effective space in the isolation cover 12 is set to L1, and the effective height of the isolation cup 11 is set to be equal to the height of the effective space of the isolation cover 12, so as to ensure that the heights of the liquid port and the gas port are consistent.

Claims

1. A device for sealing the bottom of a reactor by using reaction liquid and gas, characterized in that: The invention comprises a reaction kettle (1) and a rotating shaft (3); the bottom of the reaction kettle (1) is provided with a through hole for the rotating shaft (3) to pass through; the bottom of the reaction kettle (1) is provided with an isolation cup (11), and the through hole is located in the isolation cup (11); the rotating shaft (3) is provided with an isolation cover (12), and when the rotating shaft (3) is in an installed state, the isolation cover (12) can be buckled on the isolation cup (11), and the isolation cup (11) is located inside the reaction kettle (1); the bottom of the reaction kettle (1) is provided with an isolation cup (11), and the isolation cup (11) is located in the reaction kettle (1). A shaft support box (14) is provided at the bottom of the reactor (1), a bearing (7) is provided in the shaft support box (14), and the rotating shaft (3) passes through the through hole and is connected to the bearing (7); a liquid passage is formed between the isolation cover (12) and the bottom of the reactor (1), and a gas passage is formed between the isolation cover (12) and the top of the isolation cup (11); an air inlet pipe (15) is provided between the isolation cover (12) and the isolation cup (11), and the top of the air inlet pipe (15) is flush with the top of the isolation cup (11).

2. The device for sealing the bottom of a reactor by using reaction liquid and gas as claimed in claim 1, characterized in that: The isolation cover (12) is sealedly connected to the rotating shaft (3); the isolation cup (11) is sealedly connected to the reaction kettle (1); and the shaft support box (14) is sealedly connected to the reaction kettle (1).

3. The device for sealing the bottom of a reactor by using reaction liquid and gas as claimed in claim 1, characterized in that: The isolation cover (12) and the rotating shaft (3) are sealed by an integral molding, a welded seal, an O-ring axial seal, an O-ring radial seal or a packing seal; and / or the isolation cup (11) and the reactor (1) are sealed by an integral molding, a welded seal, an O-ring axial seal, an O-ring radial seal or a packing seal; and / or the shaft support box (14) and the reactor (1) are sealed by an integral molding, a welded seal, an O-ring axial seal, an O-ring radial seal or a packing seal.

4. The device for sealing the bottom of a reactor by using reaction liquid and gas as claimed in claim 1, characterized in that: The air inlet pipe (15) extends from the bottom of the reaction kettle (1), and the air inlet pipe (15) is sealedly connected to the reaction kettle (1).

5. The device for sealing the bottom of a reactor by using reaction liquid and gas as claimed in claim 1, characterized in that: A liquid level sensor (13) is provided between the isolation cover (12) and the isolation cup (11), and the top of the liquid level sensor (13) is lower than the top of the isolation cup (11).

6. The device for sealing the bottom of a reactor by using reaction liquid and gas as claimed in claim 5, characterized in that: The liquid level sensor (13) extends from the bottom of the reaction kettle (1), and the liquid level sensor (13) is sealedly connected to the reaction kettle (1).

7. The device for sealing the bottom of a reactor by using reaction liquid and gas as claimed in claim 1, 2 or 3, characterized in that: A connecting ring (16) is detachably provided in the shaft support box (14), the bearing (7) is arranged in the connecting ring (16), and the connecting ring (16) is integrally formed with the bottom of the reaction kettle (1); a sealing component is provided between the connecting ring (16) and the shaft support box (14).

8. The device for sealing the bottom of a reactor by using reaction liquid and gas as claimed in claim 7, characterized in that: The detachable connection is a threaded connection or a snap-on connection; when a threaded connection is adopted, an external thread is provided on the connecting ring (16), and an internal thread matching the external thread is provided on the shaft support box (14), and the sealing assembly is formed by the external thread and the internal thread; when a snap-on connection is adopted, a sealing rubber layer is provided between the connecting ring (16) and the shaft support box (14).

9. The device for sealing the bottom of a reactor by using reaction liquid and gas as claimed in claim 8, characterized in that: A sealing rubber layer is coated on the external thread, and after the internal thread and the external thread are matched and connected, the sealing rubber layer is clamped between the connecting ring (16) and the shaft support box (14).

10. The device for sealing the bottom of a reactor by using reaction liquid and gas as claimed in claim 1, 2, 3, 8 or 9, characterized in that: The outer wall of the shaft support box (14) is provided with a plurality of heat conducting fins.

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