Upper tower pressure control device

Abstract

The utility model relates to the technical field of air separation equipment, in particular to an upper tower pressure control device. According to the technical scheme, the upper tower pressure control device comprises a surrounding plate, a guide pipe, a threaded rod and a bottom plate, a flange plate is arranged on the outer surface of the guide pipe, a limiting rod is arranged in the guide pipe, the threaded rod is arranged in the guide pipe, the bottom end of the threaded rod is connected with the bottom plate, and the surrounding plate is arranged on the edge of the bottom plate. A clamping groove is formed between the surrounding plate and the bottom plate, the bottom plate is connected to the bottom end of the guide pipe in a clamped mode through the clamping groove, a limiting groove is formed in the threaded rod in a penetrating mode, the limiting rod of the guide pipe penetrates through the limiting groove, and then the threaded rod is limited in the guide pipe. The device has the advantages of accurate pressure control, adjustability, compact structural design, stability, reliability, simplicity and convenience in operation, corrosion resistance and the like, is suitable for various industrial production occasions, and can effectively improve the production efficiency, reduce the production cost and guarantee the safe and stable operation of industrial production.

Description

Technical Field

[0001] The utility model relates to the technical field of air separation equipment, in particular to an upper tower pressure control device. Background Art

[0002] Air separation equipment is a device used to separate different components such as nitrogen, oxygen, argon, etc. from the air. Tower installation is an important step in these devices, which involves introducing a mixed gas (usually air) from the bottom into a tower (usually a tower-type device), and then separating the different components in the tower through processes such as adsorption, condensation or compression. Air separation equipment includes a distillation tower. Tower pressure control on an air separation distillation tower is a very important part of the air separation process, which directly affects the purity and yield of the product. The tower pressure control on existing air separation equipment is controlled by a flap valve, but it is easy to be damaged when the pressure in the tower is too high, and the user experience is not good. Utility Model Content

[0003] The utility model provides an upper tower pressure control device, which solves the above-mentioned technical problems.

[0004] The utility model solves the above-mentioned technical problems as follows:

[0005] A pressure control device for an upper tower comprises a surrounding plate, a conduit, a threaded rod and a bottom plate, wherein the outer surface of the conduit is provided with a flange, the interior of the conduit is provided with a limiting rod, the conduit is provided with a threaded rod, the bottom end of the threaded rod is connected to the bottom plate, a surrounding plate is provided at the edge of the bottom plate, a slot is provided between the surrounding plate and the bottom plate, the bottom plate is clamped to the bottom end of the conduit through the slot, a limiting slot is penetrated through the threaded rod, the limiting rod of the conduit penetrates the limiting slot, and the threaded rod is limited in the conduit.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Further, the conduit is installed at the pressure relief port of the upper tower of the distillation tower through a flange plate. The beneficial effects of adopting the above further solution are:

[0008] Easy installation: Flange is a common connection method, which makes the installation of the conduit very easy. By installing the conduit at the pressure relief port of the distillation tower through the flange limiter, the installation operation can be carried out quickly and conveniently, reducing the time and labor costs during the installation process.

[0009] Reliable fixation: The flange provides a reliable fixation method to ensure the stability of the conduit in the installation position. This is especially important for industrial equipment such as distillation towers, because high pressure and high temperature may occur during operation, and the conduit needs to be firmly fixed at the pressure relief port to prevent accidental falling off or displacement.

[0010] Easy maintenance and replacement: The flange limit installation design makes it easier to maintain and replace the conduit. When the conduit needs to be repaired or replaced, just unscrew the bolts on the flange to easily remove or replace the conduit without disassembling the entire device or making major adjustments.

[0011] Strong applicability: Flange connection is a universal industrial connection method, suitable for pipes of various diameters and pressure levels. This means that this design is not only applicable in this device, but also can be applied to other similar pressure control devices or industrial equipment, with strong versatility and expansibility.

[0012] Good sealing performance: A properly designed flange connection can provide good sealing performance to prevent gas or liquid from leaking from the connection. This is crucial for pressure control devices, because leakage may lead to pressure loss or process quality problems. The sealing effect can be guaranteed by the limited installation of the flange.

[0013] Reduce the risk of leakage: The conduit is installed at the pressure relief port of the upper tower of the distillation tower through a flange limiter, reducing the risk of leakage caused by interface problems. This design ensures the firmness and sealing of the connection, reduces the possibility of leakage, and improves work safety.

[0014] Furthermore, threads are provided on the outer side of the threaded rod, a synchronous wheel is installed on the threaded rod through thread limiting, the threaded rod is transmission-connected to an external motor through the synchronous wheel and a synchronous belt, and the threaded rod is lifted and lowered through thread engagement.

[0015] The beneficial effects of adopting the above further scheme are:

[0016] Precise lifting and lowering control: The threaded rod design can achieve precise lifting and lowering control through thread engagement. The threaded rod is provided with threads on the outside, and when the threaded rod rotates, the threads will engage with the corresponding nut or nuts, so that the threaded rod can be lifted and lowered along the axis. This design can achieve the precision of lifting and lowering movement, which is conducive to fine adjustment of the upper tower pressure control device.

[0017] Stable motion transmission: The threaded rod is equipped with a synchronous wheel through a thread limiter, and the threaded rod is connected to the external motor through a synchronous wheel and a synchronous belt. This design ensures that the movement of the threaded rod is stable and reliable, avoiding uneven lifting or uncontrolled lifting due to the instability of the transmission system.

[0018] Low noise: The design of the threaded rod connected to the external motor drive through the synchronous wheel and synchronous belt can reduce the noise level of the device. Compared with other transmission methods, such as gear transmission or chain transmission, synchronous belt transmission is usually quieter. This is an advantage for industrial production sites because it can reduce the impact of noise on the working environment and operators.

[0019] Easy maintenance: Synchronous belt drive systems generally have a long service life and require less maintenance. This makes the maintenance of the entire threaded rod lifting system easier, reducing downtime and repair costs.

[0020] High efficiency and energy saving: The transmission efficiency of the synchronous belt drive system is usually high, which can convert the energy of the motor into the lifting and lowering movement of the threaded rod. This means that when achieving the same lifting effect, it may be more energy-efficient than other transmission methods.

[0021] Flexibility: Through the external motor drive connection, the lifting speed and direction of the threaded rod can be flexibly controlled. This flexibility enables the pressure control device to adapt to different process parameters and work requirements, improving the versatility and applicability of the device.

[0022] Furthermore, the sizes of the limiting groove and the limiting rod are matched, and the threaded rod is limited in the catheter by the limiting groove and the limiting rod to be raised and lowered.

[0023] The beneficial effects of adopting the above further scheme are:

[0024] Safe and reliable: The matching design of the limit slot and the limit rod ensures the stability and safety of the threaded rod when it is raised and lowered in the conduit. This design can effectively prevent the threaded rod from tilting, twisting or detaching during movement, ensuring the normal operation of the device.

[0025] Prevent over-limit movement: The function of the limit slot and the limit rod is to limit the lifting range of the threaded rod and prevent it from exceeding the designed range. When the threaded rod reaches the upper or lower limit of the limit slot, the limit rod will stop the threaded rod from moving. This can effectively prevent equipment damage or process loss of control caused by over-limit movement of the threaded rod.

[0026] Protecting the device and process: The matching design of the limit groove and the limit rod not only protects the threaded rod itself, but also protects the entire pressure control device and process. By limiting the lifting range of the threaded rod, wear or damage to the device parts caused by improper movement can be avoided, while also ensuring the stability and continuity of the process.

[0027] Improve the service life of the device: Due to the role of the limit groove and the limit rod, the threaded rod is always kept within the specified range during the movement. This helps to reduce friction and stress concentration when the threaded rod moves, and prolongs the service life of the threaded rod and other related parts.

[0028] Easy operation: The design of the limit slot and limit rod makes the operation of the device easy and intuitive. The operator can easily understand the lifting and lowering status of the threaded rod by observing the position of the limit rod. This helps the operator to monitor and adjust more conveniently, improving the efficiency and accuracy of the operation.

[0029] Strong adaptability: The size of the limit slot and the limit rod are matched and can be adjusted and customized according to the specific pressure control requirements. This design has a certain flexibility and can adapt to pressure control devices of different specifications and working environments, improving the versatility and adaptability of the device.

[0030] Furthermore, a sealing gasket is provided in the card slot.

[0031] The beneficial effects of adopting the above further scheme are:

[0032] Effective sealing performance: The sealing gasket in the slot can provide effective sealing to prevent gas or liquid from leaking from the slot. This is very critical for pressure control devices, because good sealing performance can ensure that there will be no leakage when the device is working, ensuring the safety and stability of the production process.

[0033] Preventing foreign substances from entering: The seal not only prevents internal substances from leaking, but also prevents external dust, impurities or moisture from entering the card slot. This helps protect the internal components of the device from the influence of the external environment and prolongs the service life of the device.

[0034] Corrosion and wear resistance: Gaskets are usually made of corrosion-resistant and wear-resistant materials, such as rubber, polytetrafluoroethylene (PTFE), etc. These materials have good corrosion resistance and can resist the erosion of chemical substances. They also have certain wear resistance, which reduces the replacement frequency of gaskets and reduces maintenance costs.

[0035] Easy to replace and maintain: The gasket is usually detachable, which makes replacement and maintenance very convenient. When the gasket needs to be replaced due to long-term use or wear, just remove the original gasket and install the new one without disassembling the entire slot structure, saving maintenance time and cost.

[0036] Improve the operational stability of the device: A good gasket can ensure the stability and reliability of the device during operation. By preventing leakage and the entry of foreign substances, the operation of the device will not be disturbed by external factors, maintaining the normal working state of the device.

[0037] Comply with environmental protection requirements: The use of sealing gaskets can effectively reduce gas or liquid leakage and reduce the risk of environmental pollution. This meets the requirements of modern industry for environmental protection and sustainable development, and reflects the responsibilities and obligations of pressure control devices in industrial production.

[0038] The beneficial effects of the utility model are:

[0039] Precise pressure control: This device can accurately control the pressure inside the upper tower because it is connected to the conduit through the slots of the coaming and the bottom plate to ensure a sealing effect. When the pressure exceeds the preset value, the coaming and the bottom plate will be firmly connected to prevent gas or liquid leakage, thereby effectively controlling the pressure.

[0040] Adjustability: The threaded rod connected by the external motor drive can be raised and lowered by thread engagement, thereby adjusting the distance between the enclosure and the base plate to meet the working requirements under different pressure conditions. This adjustability enables the device to respond flexibly under different process parameters, improving its applicability and versatility.

[0041] Compact structural design: The device uses threaded rods, limit slots, limit rods and other structures, making the design of the entire device very compact. This compact structural design can save space and is particularly suitable for occasions with limited space, such as tower equipment. At the same time, the compact structure also reduces the weight of the device, making it easier to install and maintain.

[0042] Stable and reliable: Due to the structure of the enclosure and the bottom plate, the limit slot and the limit rod, the device is more stable and reliable when working. The close connection between the enclosure and the bottom plate ensures the stability of the device under high pressure, and the cooperation between the limit slot and the limit rod makes the lifting movement of the device more stable, extending the service life of the device.

[0043] Easy operation: The operation of the device is controlled by an external motor drive, which can realize remote control and automatic operation, reducing the complexity and work intensity of manual operation. This ease of operation improves work efficiency, reduces the labor intensity of operators, and also reduces the possibility of operating errors and improves work safety.

[0044] Corrosion resistance: The device uses corrosion-resistant materials such as sealing gaskets, which can effectively prevent gas or liquid leakage, and has good corrosion resistance, suitable for handling various chemicals and corrosive media. This corrosion resistance can ensure the long-term stable operation of the device, reduce the frequency of maintenance and replacement of parts, and reduce the cost of use.

[0045] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiment of the utility model with the accompanying drawings. The specific implementation method of the utility model is given in detail by the following embodiments and their drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0047] In the attached picture:

[0048] Figure 1 This is a schematic diagram of the main appearance of the utility model;

[0049] Figure 2 This is a schematic diagram of the axial side appearance of the utility model;

[0050] Figure 3 This is a schematic diagram of the axial side half-section structure of the utility model;

[0051] Figure 4 It is a schematic diagram of the main structure of the utility model.

[0052] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0053] 1. Enclosure; 2. Conduit; 3. Flange; 4. Synchronous wheel; 5. Threaded rod; 6. Limiting groove; 7. Clamping groove; 8. Limiting rod; 9. Bottom plate. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0055] See also Figures 1 to 4 As shown, the embodiments provided by the utility model:

[0056] Embodiment 1

[0057] A pressure control device for an upper tower includes a shroud 1, a conduit 2, a threaded rod 5 and a bottom plate 9. A flange 3 is provided on the outer surface of the conduit 2. The conduit 2 is limitedly installed at the pressure relief port of the upper tower of a distillation tower through the flange 3. The flange 3 is a commonly used connection method, which makes the installation of the conduit 2 very simple. By limiting the conduit 2 at the pressure relief port of the distillation tower through the flange 3, the installation operation can be carried out quickly and conveniently, reducing the time and labor costs during the installation process. The flange 3 provides a reliable fixing method to ensure the stability of the conduit 2 at the installation position. This is particularly important for industrial equipment such as distillation towers, because high pressure, high temperature and the like may occur during the working process, and the conduit 2 needs to be firmly fixed at the pressure relief port to prevent accidental falling off or displacement. The design of limiting the installation with the flange 3 makes it more convenient to maintain and replace the conduit 2. When the conduit 2 needs to be repaired or replaced, the conduit 2 can be easily removed or replaced by unscrewing the bolts on the flange 3 without disassembling or significantly adjusting the entire device. The flange 3 connection is a universal industrial connection method, which is suitable for conduits 2 of various diameters and pressure levels. This means that this design is not only applicable in this device, but also can be applied to other similar pressure control devices or industrial equipment, with strong versatility and expansibility. A reasonably designed flange 3 connection can provide good sealing performance to prevent gas or liquid from leaking from the connection. This is crucial for pressure control devices, because leakage may lead to pressure loss or process quality problems. The sealing effect can be guaranteed by the limited installation of the flange 3. The conduit 2 is limitedly installed at the pressure relief port of the upper tower of the distillation tower through the flange 3, reducing the risk of leakage caused by interface problems. This design ensures the firmness and sealing of the connection, reduces the possibility of leakage, and improves work safety. A limit rod 8 is provided inside the conduit 2, a threaded rod 5 is provided inside the conduit 2, and a thread is provided on the outer side of the threaded rod 5. A synchronous wheel 4 is installed on the threaded rod 5 through a threaded limit. The threaded rod 5 is connected to the external motor through the synchronous wheel 4 and the synchronous belt. The threaded rod 5 is lifted and lowered by threaded engagement. The design of the threaded rod 5 can achieve precise lifting control through threaded engagement. The outer side of the threaded rod 5 is provided with a thread. When the threaded rod 5 rotates, the thread will fit with the corresponding nut or nut, so that the threaded rod 5 can be lifted and lowered along the axis. This design can achieve the accuracy of the lifting movement, which is conducive to fine adjustment of the upper tower pressure control device. A synchronous wheel 4 is installed on the threaded rod 5 through a thread limiter, and the threaded rod 5 is connected to the external motor through the synchronous wheel 4 and the synchronous belt. This design ensures that the movement of the threaded rod 5 is stable and reliable, and avoids uneven lifting or uncontrolled lifting due to the instability of the transmission system. The design of the threaded rod 5 being connected to the external motor through the synchronous wheel 4 and the synchronous belt can reduce the noise level of the device. Compared with other transmission methods, such as gear transmission or chain transmission, synchronous belt transmission usually has less noise.This is an advantage for industrial production sites because it can reduce the impact of noise on the working environment and operators. Synchronous belt drive systems usually have a long service life and less maintenance requirements. This makes the maintenance of the entire threaded rod 5 lifting system easier, reducing downtime and maintenance costs. The transmission efficiency of the synchronous belt drive system is usually high, and it can convert the energy of the motor into the lifting movement of the threaded rod 5. This means that it may be more energy-efficient than other transmission methods when achieving the same lifting effect. Through the external motor transmission connection, the lifting speed and direction of the threaded rod 5 can be flexibly controlled. This flexibility enables the pressure control device to adapt to different process parameters and work requirements, improves the versatility and applicability of the device, the limit groove 6 is adapted to the size of the limit rod 8, and the threaded rod 5 is limited to the guide tube 2 by the limit groove 6 and the limit rod 8 for lifting. The limit groove 6 is designed to be adapted to the size of the limit rod 8, which ensures the stability and safety of the threaded rod 5 when it is lifted in the guide tube 2. This design can effectively prevent the threaded rod 5 from tilting, distorting or detaching during the movement, and ensures the normal operation of the device. The function of the limit groove 6 and the limit rod 8 is to limit the lifting range of the threaded rod 5 to prevent it from exceeding the design range. When the threaded rod 5 reaches the upper or lower limit of the limit groove 6, the limit rod 8 will play a blocking role, so that the threaded rod 5 stops moving. In this way, it can effectively avoid equipment damage or process loss of control caused by the over-limit movement of the threaded rod 5. The adaptive design of the limit groove 6 and the limit rod 8 not only protects the threaded rod 5 itself, but also protects the entire pressure control device and process. By limiting the lifting range of the threaded rod 5, it is possible to avoid wear or damage to the device parts caused by improper movement, and at the same time, it also ensures the stability and continuity of the process. Due to the role of the limit groove 6 and the limit rod 8, the threaded rod 5 is always kept within the specified range during the movement. This helps to reduce friction and stress concentration when the threaded rod 5 moves, and prolongs the service life of the threaded rod 5 and other related parts. The design of the limit groove 6 and the limit rod 8 makes the operation of the device simple and intuitive. The operator can easily understand the lifting state of the threaded rod 5 by observing the position of the limit rod 8. This helps operators to monitor and adjust more conveniently, improving the efficiency and accuracy of the operation. The size adaptation design of the limit slot 6 and the limit rod 8 can be adjusted and customized according to the specific pressure control requirements. This design has a certain flexibility and can adapt to pressure control devices of different specifications and working environments, improving the versatility and adaptability of the device. The bottom end of the threaded rod 5 is connected to a base plate 9, and a surrounding plate 1 is provided at the edge of the base plate 9. A card slot 7 is provided between the surrounding plate 1 and the base plate 9. A sealing gasket is provided in the card slot 7. The sealing gasket provided in the card slot 7 can provide an effective seal to prevent gas or liquid from leaking from the card slot 7. This is very critical for the pressure control device, because good sealing performance can ensure that there will be no leakage when the device is working, ensuring the safety and stability of the production process.The sealing gasket can not only prevent the leakage of internal substances, but also prevent external dust, impurities or moisture from entering the card slot 7. This helps to protect the internal parts of the device from the influence of the external environment and prolong the service life of the device. The sealing gasket is usually made of corrosion-resistant and wear-resistant materials, such as rubber, polytetrafluoroethylene (PTFE), etc. These materials have good corrosion resistance and can resist the erosion of chemical substances. They also have certain wear resistance, which reduces the replacement frequency of the sealing gasket and reduces maintenance costs. The sealing gasket is usually detachable, which makes replacement and maintenance very convenient. When the sealing gasket needs to be replaced due to long-term use or wear, it is only necessary to remove the original sealing gasket and then install a new sealing gasket, without disassembling the entire card slot 7 structure, saving maintenance time and cost. A good sealing gasket can ensure the stability and reliability of the device during operation. By preventing leakage and the entry of external substances, the operation of the device will not be disturbed by external factors, and the normal working state of the device is maintained. The use of sealing gaskets can effectively reduce gas or liquid leakage and reduce the risk of environmental pollution. This complies with the requirements of modern industry for environmental protection and sustainable development, and reflects the responsibilities and obligations of pressure control devices in industrial production. The bottom plate 9 is clamped at the bottom end of the conduit 2 through the clamping groove 7. When the pressure in the upper tower is too high, the internal pressure of the upper tower will cause the enclosure 1 and the bottom plate 9 to be tightly clamped at the conduit 2 through the clamping groove 7, thereby ensuring the sealing effect. A limiting groove 6 is penetrated on the threaded rod 5, and the limiting rod 8 of the conduit 2 penetrates the limiting groove 6, thereby limiting the threaded rod 5 in the conduit 2.

[0058] When an upper tower pressure control device based on Example 1 is used:

[0059] Precise pressure control: This device can precisely control the pressure inside the upper tower because it is connected to the conduit 2 through the slots 7 of the coaming 1 and the bottom plate 9 to ensure a sealing effect. When the pressure exceeds the preset value, the coaming 1 and the bottom plate 9 will be firmly connected to prevent gas or liquid leakage, thereby effectively controlling the pressure.

[0060] Adjustability: The threaded rod 5 connected by an external motor can be raised and lowered by threaded engagement, thereby adjusting the distance between the enclosure 1 and the bottom plate 9 to adapt to working requirements under different pressure conditions. This adjustability enables the device to respond flexibly under different process parameters, improving its applicability and versatility.

[0061] Compact structural design: The device adopts the structures of threaded rod 5, limit groove 6, limit rod 8, etc., making the design of the whole device very compact. This compact structural design can save space and is particularly suitable for occasions with limited space, such as tower equipment. At the same time, the compact structure also reduces the weight of the device, which is convenient for installation and maintenance.

[0062] Stable and reliable: Due to the structure of the enclosure 1 and the bottom plate 9, the limit groove 6 and the limit rod 8, the device is more stable and reliable when working. The close connection between the enclosure 1 and the bottom plate 9 ensures the stability of the device under high pressure, and the cooperation between the limit groove 6 and the limit rod 8 makes the lifting movement of the device more stable, extending the service life of the device.

[0063] Easy operation: The operation of the device is controlled by an external motor drive, which can realize remote control and automatic operation, reducing the complexity and work intensity of manual operation. This ease of operation improves work efficiency, reduces the labor intensity of operators, and also reduces the possibility of operating errors and improves work safety.

[0064] Corrosion resistance: The device uses corrosion-resistant materials such as sealing gaskets, which can effectively prevent gas or liquid leakage, and has good corrosion resistance, suitable for handling various chemicals and corrosive media. This corrosion resistance can ensure the long-term stable operation of the device, reduce the frequency of maintenance and replacement of parts, and reduce the cost of use.

[0065] The above description is only a preferred embodiment of the utility model and does not impose any form of limitation on the utility model. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. An upper tower pressure control device, characterized in that: The invention comprises a surrounding plate (1), a conduit (2), a threaded rod (5) and a bottom plate (9); the outer surface of the conduit (2) is provided with a flange (3); the interior of the conduit (2) is provided with a limiting rod (8); the conduit (2) is provided with a threaded rod (5); the bottom end of the threaded rod (5) is connected to the bottom plate (9); a surrounding plate (1) is provided at the edge of the bottom plate (9); a clamping groove (7) is provided between the surrounding plate (1) and the bottom plate (9); the bottom plate (9) is clamped to the bottom end of the conduit (2) through the clamping groove (7); a limiting groove (6) is penetrated through the threaded rod (5); the limiting rod (8) of the conduit (2) penetrates the limiting groove (6), thereby limiting the threaded rod (5) in the conduit (2).

2. The upper tower pressure control device according to claim 1, characterized in that: The conduit (2) is installed at the pressure relief port of the upper tower of the distillation tower by means of a flange (3) to limit the position of the conduit.

3. The upper tower pressure control device according to claim 1, characterized in that: The outer side of the threaded rod (5) is provided with a thread, a synchronous wheel (4) is installed on the threaded rod (5) through a thread limiter, the threaded rod (5) is connected to an external motor through the synchronous wheel (4) and a synchronous belt, and the threaded rod (5) is raised and lowered through thread engagement.

4. The upper tower pressure control device according to claim 1, characterized in that: The size of the limiting groove (6) is matched with that of the limiting rod (8), and the threaded rod (5) is limited in the conduit (2) by the limiting groove (6) and the limiting rod (8) to be raised and lowered.

5. The upper tower pressure control device according to claim 1, characterized in that: A sealing gasket is arranged in the card slot (7).

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