Feeding pump of rectification purification tower

Abstract

The utility model relates to the technical field of feed pumps, in particular to a rectification purification tower feed pump which comprises a driving device, a pump shell and a discharge pipe, the pump shell is arranged on the outer side of the driving device, the discharge pipe is fixedly connected to the upper end of the outer side of the pump shell, a feed assembly is fixedly connected to the outer side of the pump shell and comprises a feed pipe, and an inner fixing ring is fixedly connected to the inner side of the feed pipe. The inner ring side of the inner fixing ring is fixedly connected with a limiting ring, the side, away from the driving device, of the limiting ring is tightly attached to the first sealing gasket, a clamping groove is formed in the inner side of the inner fixing ring, and a connecting assembly is arranged on the inner side of the feeding pipe and comprises a connecting pipe, a guide ring is fixedly connected to the outer side of the connecting pipe, and the outer side of the connecting pipe is sleeved with a sealing rubber ring. According to the VCM connecting structure, the sealing problem caused by uneven bolt fastening in traditional flange connection is effectively solved, the sealing reliability of the connecting position is remarkably improved, the leakage risk of a VCM single body is reduced, and safe and stable operation of production equipment is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of feed pump technology, specifically a feed pump for a distillation purification tower. Background Technology

[0002] A feed pump is an industrial device used to transport various liquid or semi-solid substances from one location to another. Its main function is to transport various liquid and semi-solid materials from one device to another, thereby realizing a continuous production process.

[0003] A feed pump for a distillation purification column is a pump specifically designed to transport materials into the distillation column. Its function is to ensure that materials can enter the distillation column stably and continuously for separation and purification. The separation effect of the distillation column largely depends on the stability and continuity of the feed. The feed pump can deliver materials into the column at a constant flow rate, ensuring the smooth operation of the distillation process. By adjusting the speed of the feed pump or the valve opening, the feed rate can be precisely controlled to meet the needs of the distillation column under different operating conditions. In the application of the distillation column, the feed pump needs to overcome the pressure inside the column and deliver the material to the designated feed plate position.

[0004] In the production of polyvinyl chloride (PVC), a distillation purification column is used. A feed pump draws and transports the raw materials for PVC production—VCM monomer and dichloroethane—into the column so that they can work together to produce qualified PVC. Dichloroethane is primarily generated through the reaction of ethylene and chlorine, and then through thermal cracking to produce VCM monomer. However, VCM monomer is only slightly soluble in water but soluble in ethanol and ether. It is toxic, and long-term inhalation or contact can cause liver cancer. It also readily forms explosive mixtures with air. The connection between the feed pump and the VCM monomer delivery pipe relies on flanges with sealing gaskets and multiple bolts. The tightness of the connection between the two flanges depends entirely on the bolt tightening performance. However, with a large number of bolts on the flanges, it is difficult to control the uniformity of bolt tightening, which can easily lead to uneven stress on the sealing gaskets, causing them to crack. This can result in leakage of the VCM monomer delivered by the feed pump, creating a significant safety hazard.

[0005] In view of this, we propose a feed pump for a distillation purification tower. Utility Model Content

[0006] The purpose of this invention is to provide a feed pump for a distillation and purification tower to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A feed pump for a distillation and purification column includes a drive unit, a pump casing, and a discharge pipe. The pump casing is located outside the drive unit. The discharge pipe is fixedly connected to the upper end of the outer side of the pump casing. A feed assembly is fixedly connected to the outer side of the pump casing. The feed assembly includes a feed pipe. An inner fixing ring is fixedly connected to the inner side of the feed pipe. A limit ring is fixedly connected to the inner ring. The side of the limit ring away from the drive unit is in close contact with a first sealing gasket. A groove is formed on the inner side of the inner fixing ring. A connecting assembly is located inside the feed pipe. The connecting assembly includes a connecting pipe. A guide ring is fixedly connected to the outer side of the connecting pipe. A sealing rubber ring is sleeved on the outer side of the connecting pipe. An outer fixing ring is fixedly connected to the outer side of the connecting pipe. The side of the outer fixing ring closest to the center of the feed pipe is in close contact with a second sealing gasket. A pressure ring is fixedly connected to the outer side of the outer fixing ring. A locking block is fixedly connected to the outer side of the pressure ring.

[0009] As a further improvement to this technical solution, the structure of the discharge pipe is exactly the same as that of the feeding assembly. The same component as that in the feeding assembly is installed inside the discharge pipe. The connecting pipe between the discharge pipe and the feeding assembly is inserted inside the external connecting pipe of the feeding pump. The sealing rubber ring between the discharge pipe and the feeding assembly is in close contact with the inner wall of the external connecting pipe of the feeding pump.

[0010] As a further improvement to this technical solution, the outer diameter of the first sealing gasket is the same as the outer diameter of the limiting ring and the outer diameter of the pressure ring, the inner diameter of the limiting ring is the same as the inner diameter of the pressure ring, the first sealing gasket has elastic deformation, the outer side of the first sealing gasket is in close contact with the outer side of the pressure ring, and the side of the pressure ring near the first sealing gasket is on the same vertical plane as one end of the connecting pipe.

[0011] As a further improvement to this technical solution, the number of slots and the number of blocks are both four. The slots are evenly distributed with the inner fixed ring axis as the center, and the blocks are evenly distributed with the pressure ring axis as the center. The blocks slide and engage inside the slots.

[0012] As a further improvement to this technical solution, the end of the connecting pipe away from the feed pipe is flared, and a number of guide rings are evenly distributed on the outer side of the connecting pipe. The cross-section of the guide ring is a right triangle, and the inclined surface of the guide ring faces away from the feed pipe. The number of sealing rubber rings is one less than the number of guide rings. Each sealing rubber ring is disposed between two adjacent guide rings. The guide rings are disposed on the side of the outer fixing ring away from the second sealing gasket.

[0013] As a further improvement to this technical solution, the outer diameter of the outer fixing ring is the same as the inner diameter of the feed pipe. The side of the outer fixing ring away from the second sealing gasket and the end of the feed pipe near the center of the connecting pipe are on the same vertical plane. The outer fixing ring slides inside the feed pipe. The axis of the outer fixing ring and the axis of the pressure ring are both on the axis of the connecting pipe.

[0014] As a further improvement to this technical solution, the second sealing gasket is sleeved on the outside of the connecting pipe. The inner diameter of the second sealing gasket is the same as the outer diameter of the connecting pipe. The second sealing gasket slides on the outside of the connecting pipe. The side of the second sealing gasket away from the outer fixing ring is in close contact with the outside of the inner fixing ring. The second sealing gasket has elastic deformation. The outer ring side of the second sealing gasket is in close contact with the inner wall of the feed pipe.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention addresses the safety hazard of leakage caused by uneven stress on the sealing gasket at the connection between the feed pump of the distillation purification tower and the VCM monomer delivery pipe, by incorporating an inner fixing ring, a first sealing gasket, a groove, a connecting pipe, and a locking block. A multi-dimensional sealing protection system is constructed through the use of an inner fixing ring with a limiting ring and a groove, combined with a pressure ring, a locking block, and multiple layers of sealing gaskets. When connecting to the external pipeline, the cooperation of the locking block and groove ensures the connection assembly is securely installed inside the feed pipe, while the first sealing gasket deforms under pressure to achieve initial sealing. The outer fixing ring and the second sealing gasket further enhance the sealing effect. The guide ring and sealing rubber ring on the outside of the connecting pipe provide multiple sealing barriers when inserted into the external pipeline. This structure effectively solves the sealing problem caused by uneven bolt tightening in traditional flange connections, significantly improves the sealing reliability at the connection, reduces the risk of VCM monomer leakage, and ensures the safe and stable operation of production equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the feeding assembly structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of the feed pipe of this utility model;

[0020] Figure 4 This utility model Figure 3 Schematic diagram of the structure at point A in the middle;

[0021] Figure 5 This is a schematic diagram of the feed pipe structure of this utility model;

[0022] Figure 6This is a schematic diagram of the exploded structure of the connecting pipe of this utility model;

[0023] Figure 7 This is a schematic diagram of the inner fixing ring structure of this utility model.

[0024] In the diagram: 1. Drive unit; 2. Pump casing; 3. Discharge pipe;

[0025] 4. Feeding assembly; 41. Feeding pipe; 42. Inner fixing ring; 43. Limiting ring; 44. First sealing gasket; 45. Slot;

[0026] 46. ​​Connecting assembly; 461. Connecting pipe; 462. Guide ring; 463. Sealing rubber ring; 464. Outer fixing ring; 465. Second sealing gasket; 466. Pressure ring; 467. Locking block. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] The connection between the feed pump of the distillation purification tower and the delivery pipe of the VCM monomer mainly relies on the installation of sealing gaskets between the flanges and the fixing of them together with multiple bolts. The tightness of the connection between the two flanges depends entirely on the tightening performance of the bolts. However, there are many bolts on the flanges, making it difficult to control the uniformity of bolt tightening. This can easily lead to deviation in the force on the sealing gaskets, causing uneven stress and breakage of the sealing gaskets. This results in leakage of the VCM monomer delivered by the feed pump of the distillation purification tower, creating a significant safety hazard.

[0030] like Figure 1-7As shown, this embodiment provides a feed pump for a distillation purification tower, including a drive unit 1, a pump casing 2, and a discharge pipe 3. The pump casing 2 is located outside the drive unit 1, and the discharge pipe 3 is fixedly connected to the upper end of the outer side of the pump casing 2. A feed assembly 4 is fixedly connected to the outer side of the pump casing 2. The feed assembly 4 includes a feed pipe 41, an inner fixing ring 42 is fixedly connected to the inner side of the feed pipe 41, and a limit ring 43 is fixedly connected to the inner ring side of the inner fixing ring 42. The side of the limit ring 43 away from the drive unit 1 is in close contact with a first sealing gasket 44. A groove 45 is provided on the inner side of the inner fixing ring 42. A connecting assembly 46 is provided inside the feed pipe 41. The connecting assembly 46 includes a connecting pipe 461, a guide ring 462 is fixedly connected to the outer side of the connecting pipe 461, a sealing rubber ring 463 is sleeved on the outer side of the connecting pipe 461, and an outer fixing ring 464 is fixedly connected to the outer side of the connecting pipe 461. The outer fixing ring 464 is close to the center of the feed pipe 41. One side of the outer fixed ring 464 is in close contact with the second sealing gasket 465. A pressure ring 466 is fixedly connected to the outer side of the outer fixed ring 464. A locking block 467 is fixedly connected to the outer side of the pressure ring 466. The locking block 467 is installed and locked into the slot 45 in the inner fixed ring 42 fixedly connected to the inner side of the feed pipe 41. The pressure ring 466 presses the first sealing gasket 44 in the inner ring of the inner fixed ring 42 to ensure the connection sealing between one end of the pressure ring 466 and the feed pipe 41. At the same time, the outer fixed ring 464 entering the feed pipe 41 presses the second sealing gasket 465 between it and the inner fixed ring 42, thereby further improving the connection sealing between the connecting pipe 461 and the feed pipe 41. Thus, when the feed pump is connected to the external connecting pipe, the connecting pipe 461 can be inserted into the inner side of the external connecting pipe, and the sealing of the external connecting pipe connected to the feed pump through the flange is improved.

[0031] like Figure 1 As shown, the structure of the discharge pipe 3 is exactly the same as that of the feeding assembly 4. The discharge pipe 3 has the same components as those in the feeding assembly 4. The connecting pipe 461 of the discharge pipe 3 and the feeding assembly 4 is inserted into the external connecting pipe of the feeding pump. The sealing rubber ring 463 of the discharge pipe 3 and the feeding assembly 4 are tightly attached to the inner wall of the external connecting pipe of the feeding pump. After the connecting pipe 461 installed on the inner side of the feeding assembly 4 is inserted into the external connecting pipe of the feeding pump, the external connecting pipe of the feeding pump can be connected to the flange on the outer side of the feeding pipe 41 of the feeding pump through the combination of its outer flange and bolts and nuts, so that raw materials can be input from the feeding pipe 41. The multiple sealing rubber rings 463 sleeved on the outer side of the connecting pipe 461 inserted into the external connecting pipe of the feeding pump can play a multi-layer sealing and protection role on the inner side of the external connecting pipe of the feeding pump. Since the inner side of the discharge pipe 3 has the same structure as the inner side of the feeding assembly 4, its connection with another external connecting pipe of the feeding pump also has a sealing and protection role.

[0032] like Figure 3-5As shown, the outer diameter of the first sealing gasket 44 is the same as the outer diameter of the limiting ring 43 and the outer diameter of the pressure ring 466. The inner diameter of the limiting ring 43 is the same as the inner diameter of the pressure ring 466. The first sealing gasket 44 has elastic deformation. The outer side of the first sealing gasket 44 is in close contact with the outer side of the pressure ring 466. The side of the pressure ring 466 near the first sealing gasket 44 is on the same vertical plane as one end of the connecting pipe 461. During the process of the connecting assembly 46 being installed inside the inner fixing ring 42, the first sealing gasket 44 is fixedly connected to the pressure ring 466 by the locking block 467 in the slot 45. The pressure from the inner sliding causes the first sealing gasket 44 to undergo a certain degree of elastic compression deformation under the pressure of the pressure ring 466, thereby allowing the locking block 467 to slide and engage inside the slot 45, ensuring the overall stability of the connecting assembly 46 inside the feed pipe 41. At this time, the connecting pipe 461 is inside the feed pipe 41, and the pressure ring 466 fixedly connected to the outside of the connecting pipe 461 is tightly attached to the limiting ring 43 through the first sealing gasket 44, thus playing a second sealing protection role between the connecting pipe 461 and the feed pipe 41.

[0033] like Figure 3-7 As shown, there are four slots 45 and four blocks 467. The slots 45 are evenly distributed around the axis of the inner fixing ring 42, and the blocks 467 are evenly distributed around the axis of the pressure ring 466. The blocks 467 slide and engage inside the slots 45. When the connecting assembly 46 is installed inside the feed pipe 41, the four blocks 467 fixedly connected to the outside of the pressure ring 466 can correspond one-to-one with the slots 45 opened inside the inner fixing ring 42. The connecting assembly 46 is moved deeper into the feed pipe 41, and the blocks 467 are moved to the maximum extent inside the inner fixing ring 42 until the blocks 467 can no longer move. Then the connecting assembly 46 is rotated so that the blocks 467 can be inserted into the slots 45 opened inside the inner fixing ring 42. In this way, the connecting assembly 46 can be stably fixed and restricted inside the feed pipe 41.

[0034] like Figure 2 , 3As shown in Figure 5, the end of the connecting pipe 461 away from the feed pipe 41 is flared. Several guide rings 462 are evenly distributed at equal intervals on the outer side of the connecting pipe 461. The cross-section of each guide ring 462 is a right-angled triangle, and the inclined surface of the guide ring 462 faces away from the feed pipe 41. The number of sealing rubber rings 463 is one less than the number of guide rings 462. Each sealing rubber ring 463 is positioned between two adjacent guide rings 462. The guide rings 462 are positioned on the side of the outer fixing ring 464 away from the second sealing gasket 465. The connecting pipe 461 serves as... The connector inserted into the inner side of the feed pump external connection pipe is flared so that the material flowing inside the connector 461 can be transported or output with minimal resistance. The guide ring 462 on the outer side of the connector 461 can improve the smoothness of the connector 461 when it is installed into the feed pump external connection pipe, while increasing the resistance of the connector 461 when it is removed from the feed pump external connection pipe, ensuring the stability of the sealing rubber ring 463 between two adjacent guide rings 462, and improving the sealing performance between the connector 461 and the feed pump external connection pipe.

[0035] like Figure 3 and 4 As shown, the outer diameter of the outer retaining ring 464 is the same as the inner diameter of the feed pipe 41. The side of the outer retaining ring 464 away from the second sealing gasket 465 is on the same vertical plane as the end of the feed pipe 41 near the center of the connecting pipe 461. The outer retaining ring 464 slides inside the feed pipe 41. The axis of the outer retaining ring 464 and the axis of the pressure ring 466 are both on the axis of the connecting pipe 461. When the connecting pipe 461 is installed inside the feed pipe 41, the outer retaining ring 464 slides into the inside of the feed pipe 41, and the pressure ring 466... While the first sealing gasket 44 is being pressed, the second sealing gasket 465, which is tightly attached to one side of the outer fixing ring 464, is pressed between the outer fixing ring 464 and the inner fixing ring 42 as the outer fixing ring 464 moves closer to the inner fixing ring 42. Thus, after the locking block 467 is engaged inside the locking groove 45, the second sealing gasket 465, which is located between the outer fixing ring 464 and the inner fixing ring 42, can play the role of a third sealing protection, ensuring that the connecting component 46 and the feed pipe 41 have a good sealing protection effect.

[0036] like Figure 4 and 6As shown, the second sealing gasket 465 is sleeved on the outside of the connecting pipe 461. The inner diameter of the second sealing gasket 465 is the same as the outer diameter of the connecting pipe 461. The second sealing gasket 465 slides on the outside of the connecting pipe 461. The side of the second sealing gasket 465 away from the outer fixing ring 464 is in close contact with the outer side of the inner fixing ring 42. The second sealing gasket 465 has elastic deformation. The outer ring side of the second sealing gasket 465 is in close contact with the inner wall of the feed pipe 41. The second sealing gasket 465 is installed on the feed pipe by the connecting assembly 46. After the inner side of 41, the second sealing gasket 465 is simultaneously located inside the feed pipe 41. Under the engaging connection between the locking block 467 and the locking groove 45 in the inner fixing ring 42, the second sealing gasket 465 is pressed between the outer fixing ring 464 and the inner fixing ring 42. In this way, the second sealing gasket 465 can enhance the stability of the connecting pipe 461 installed inside the feed pipe 41, and further improve the sealing performance of the connection between the connecting pipe 461 and the feed pipe 41, preventing leakage of the conveyed material inside.

[0037] In summary, the working principle of this scheme is as follows: During the use of the feed pump of the distillation purification tower, the discharge pipe 3 and feed pipe 41 of the feed pump need to be connected to corresponding external connecting pipes. Before connecting the feed pipe 41, the locking block 467 on the pressure ring 466 fixedly connected to the outside of the connecting pipe 461 can be aligned with the four slots 45 opened in the inner fixing ring 42 fixedly connected to the inside of the feed pipe 41. This allows the connecting pipe 461 to drive the pressure ring 466 to move towards the inner fixing ring 42 inside the feed pipe 41, while the locking block 467 fixedly connected to the outside of the pressure ring 466 gradually penetrates into the slots 45 inside the inner fixing ring 42 until the locking block 467 can no longer penetrate. Then, the connecting pipe 461 is rotated to allow the connection to proceed. The pressure ring 466 drives the locking block 467 to rotate, which allows the locking block 467 to engage inside the slot 45, thus ensuring the stable installation of the connecting component 46 inside the feed pipe 41. As the locking block 467 moves inside the slot 45, the pressure ring 466 gradually approaches the limiting ring 43, which is fixedly connected to the inner ring of the inner fixed ring 42, and compresses the first sealing gasket 44 on one side of the limiting ring 43. This causes the first sealing gasket 44 to undergo a certain amount of elastic compression, allowing the locking block 467 to engage in the slot 45 during subsequent rotation. After the locking block 467 engages in the slot 45, the first sealing gasket 44 exerts a certain amount of restorative elasticity on the pressure ring 466, thus ensuring the locking block 46 is fixedly connected to the outer side of the pressure ring 466. 7 is also subject to elastic repulsion, thus ensuring that the locking block 467 is stably fixed and engaged inside the slot 45. During the movement of the locking block 467 inside the slot 45, the outer fixing ring 464 and the sleeved second sealing gasket 465 of the connecting pipe 461 gradually enter the inner side of the feed pipe 41 and approach the inner fixing ring 42. Simultaneously, after the second sealing gasket 465 is pressed against the inner fixing ring 42, it continues to be subjected to pressure from the outer fixing ring 464, thus generating a certain amount of elastic compression deformation. After the locking block 467 is engaged in the slot 45, the second sealing gasket 465 is still pressed between the outer fixing ring 464 and the inner fixing ring 42. The second sealing gasket 465 can then provide a good seal between the feed pipe 41 and the connecting pipe 461. The elastic restoring force of the sealing gasket 465 also allows the locking block 467 to be stably engaged inside the slot 45. Similarly, the installation principle inside the discharge pipe 3 is the same as that inside the feed assembly 4. Thus, when connecting the external connecting pipe, the connecting pipe 461 with the sealing rubber ring 463 is inserted into the external connecting pipe. Then, the external connecting pipe can be connected to the feed pump in the same way as before, using a combination of flange, bolts, and nuts. The sealing rubber ring 463 between the numerous guide rings 462 on the outside of the connecting pipe 461 is in close contact with the inner wall of the external connecting pipe, further improving the sealing and protection of the connection between the external connecting pipe of the feed pump and the feed pump. This effectively avoids the risk of leakage of VCM monomers transported by the feed pump of the distillation purification tower and reduces safety hazards.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A feed pump for a distillation purification tower, characterized in that: The device includes a drive unit (1), a pump housing (2) and a discharge pipe (3), characterized in that: the drive unit (1) is provided with a pump housing (2) on the outside, the upper end of the pump housing (2) is fixedly connected to the discharge pipe (3), and the pump housing (2) is fixedly connected to the outside of the feed assembly (4); The feeding assembly (4) includes a feeding pipe (41), an inner fixing ring (42) is fixedly connected to the inner side of the feeding pipe (41), a limit ring (43) is fixedly connected to the inner ring side of the inner fixing ring (42), the side of the limit ring (43) away from the driving device (1) is in close contact with the first sealing gasket (44), a slot (45) is opened on the inner side of the inner fixing ring (42), and a connecting assembly (46) is provided on the inner side of the feeding pipe (41). The connecting assembly (46) includes a connecting pipe (461), a guide ring (462) is fixedly connected to the outside of the connecting pipe (461), a sealing rubber ring (463) is sleeved on the outside of the connecting pipe (461), an outer fixing ring (464) is fixedly connected to the outside of the connecting pipe (461), the side of the outer fixing ring (464) near the center of the feed pipe (41) is in close contact with the second sealing gasket (465), a pressure ring (466) is fixedly connected to the outside of the outer fixing ring (464), and a locking block (467) is fixedly connected to the outside of the pressure ring (466).

2. The feed pump for a distillation purification tower according to claim 1, characterized in that: The structure of the discharge pipe (3) is exactly the same as that of the feeding assembly (4). The same component as that in the feeding assembly (4) is installed inside the discharge pipe (3). The connecting pipe (461) of the discharge pipe (3) and the feeding assembly (4) is inserted inside the external connecting pipe of the feeding pump. The sealing rubber ring (463) of the discharge pipe (3) and the feeding assembly (4) is tightly attached to the inner wall of the external connecting pipe of the feeding pump.

3. The feed pump for a distillation purification tower according to claim 1, characterized in that: The outer diameter of the first sealing gasket (44) is the same as the outer diameter of the limiting ring (43) and the outer diameter of the pressure ring (466). The inner diameter of the limiting ring (43) is the same as the inner diameter of the pressure ring (466). The first sealing gasket (44) has elastic deformation. The outer side of the first sealing gasket (44) is in close contact with the outer side of the pressure ring (466). The side of the pressure ring (466) near the first sealing gasket (44) is on the same vertical plane as one end of the connecting pipe (461).

4. The feed pump for a distillation purification tower according to claim 1, characterized in that: The number of slots (45) and the number of blocks (467) are both four. The slots (45) are evenly distributed with the inner fixing ring (42) as the center. The blocks (467) are evenly distributed with the pressure ring (466) as the center. The blocks (467) slide and engage inside the slots (45).

5. The feed pump for a distillation purification tower according to claim 1, characterized in that: The end of the connecting pipe (461) away from the feed pipe (41) is flared. Several guide rings (462) are evenly distributed on the outer side of the connecting pipe (461). The cross-section of the guide ring (462) is a right triangle. The inclined surface of the guide ring (462) faces away from the feed pipe (41). The number of sealing rubber rings (463) is one less than the number of guide rings (462). Each sealing rubber ring (463) is set between two adjacent guide rings (462). The guide rings (462) are set on the side of the outer fixing ring (464) away from the second sealing gasket (465).

6. The feed pump for a distillation purification tower according to claim 1, characterized in that: The outer diameter of the outer fixing ring (464) is the same as the inner diameter of the feed pipe (41). The side of the outer fixing ring (464) away from the second sealing gasket (465) is on the same vertical plane as the end of the feed pipe (41) near the center of the connecting pipe (461). The outer fixing ring (464) slides inside the feed pipe (41). The axis of the outer fixing ring (464) and the axis of the pressure ring (466) are both on the axis of the connecting pipe (461).

7. The feed pump for a distillation purification tower according to claim 1, characterized in that: The second sealing gasket (465) is fitted on the outside of the connecting pipe (461). The inner diameter of the second sealing gasket (465) is the same as the outer diameter of the connecting pipe (461). The second sealing gasket (465) slides on the outside of the connecting pipe (461). The side of the second sealing gasket (465) away from the outer fixing ring (464) is in close contact with the outside of the inner fixing ring (42). The second sealing gasket (465) has elastic deformation. The outer ring side of the second sealing gasket (465) is in close contact with the inner wall of the feed pipe (41).

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