A mechanically sealed vacuum distillation vessel

Abstract

This utility model belongs to the field of vacuum distillation kettle technology, specifically disclosing a mechanically sealed vacuum distillation kettle, including: a hollow kettle body, a controller, a hollow thermally conductive jacket, a hot fluid interface, an upper connecting part, a top cover, and a rotating shaft. The hollow thermally conductive jacket is disposed on the side wall of the hollow kettle body, and the hot fluid interface is connected to the upper and lower sides of the outer wall of the hollow thermally conductive jacket. This solution, based on some existing vacuum distillation kettles without a stirring structure, adds a drive motor, a rotating shaft, a stirring rod, and a mechanical seal structure, which can agitate the material inside the vacuum distillation kettle, making the material heated evenly and avoiding problems such as uneven separation and low efficiency. The mechanical seal structure effectively seals the connection between the rotating shaft and the upper convex connecting platform, preventing air leakage and ensuring a vacuum state inside the vacuum distillation kettle.

Description

Technical Field

[0001] This utility model relates to the field of vacuum distillation kettle technology, specifically a mechanically sealed vacuum distillation kettle. Background Technology

[0002] A vacuum distillation kettle is a device that combines a vacuum environment and distillation technology. It is mainly used to distill and separate materials under reduced pressure. It is widely used in chemical, pharmaceutical, food, and petroleum industries, and is especially suitable for processing high-boiling-point, heat-sensitive, or easily oxidized substances.

[0003] For example, in the separation of resin monomers, the core principle of separating resin monomers through a vacuum distillation kettle is to utilize the difference in boiling points of different resin monomers under reduced pressure to achieve stepwise separation of volatilization and condensation at a lower temperature, which is especially suitable for heat-sensitive resin monomers (avoiding decomposition or polymerization at high temperatures).

[0004] Generally, vacuum distillation kettles separate resin monomers at a specific temperature by controlling the temperature. However, uneven temperatures of the resin monomers inside the kettle can lead to low separation efficiency. Even with the addition of stirring structures, poor sealing at the shaft connection can still affect the vacuum effect of the kettle. Utility Model Content

[0005] The purpose of this invention is to provide a mechanically sealed vacuum distillation vessel to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a mechanically sealed vacuum distillation vessel, comprising:

[0007] Hollow reactor body, controller, hollow thermally conductive jacket, hot fluid interface, upper connection part, top cover and rotating shaft;

[0008] The hollow thermally conductive jacket is disposed on the side wall of the hollow vessel body, and the hot fluid interface is connected to the upper and lower sides of the outer wall of the hollow thermally conductive jacket, and the hot fluid interfaces on the upper and lower sides are in communication with the hollow thermally conductive jacket.

[0009] The upper end of the hollow vessel is connected to the upper connecting part, the upper part of the upper connecting part is sealed to the top cover, the rotating shaft is longitudinally rotatably connected to the top cover, and a mechanical seal structure is provided at the connection between the rotating shaft and the top cover. The upper part of the top cover is provided with a drive motor for driving the rotating shaft to rotate, and the bottom end of the rotating shaft extends to the hollow vessel and is connected to a stirring rod.

[0010] The bottom of the hollow reactor body is provided with a discharge pipe, and a valve is installed on the discharge pipe. The upper surface of the top cover is connected to a feed pipe, a vacuum suction cooling component and a pressure gauge. A temperature sensor is provided on the side wall of the hollow reactor body. The detection end of the temperature sensor extends into the interior of the hollow reactor body, and the signal output end of the temperature sensor is connected to the controller.

[0011] Preferably, it also includes a mounting bracket, which is installed on the outer wall of the hollow vessel, and the bottom of the controller is supported on the mounting bracket.

[0012] Preferably, the vacuum suction cooling assembly includes a vacuum suction pipe connected to the top cover, the end of the vacuum suction pipe away from the top cover being connected to a cooling central chamber, the upper part of the cooling central chamber being connected to a connecting pipe, the upper end of the connecting pipe being connected to a cooling heat exchange tower, the upper end of the cooling heat exchange tower being connected to a vacuum pipe, and the vacuum pipe being externally connected to a vacuum pump.

[0013] Preferably, the bottom of the cooling central chamber is connected to a drain pipe, and a valve is installed on the drain pipe.

[0014] Preferably, the cooling heat exchange tower includes a hollow tower body, and a spiral heat exchange tube is provided inside the hollow tower body. The spiral heat exchange tube is made of aluminum or copper, and both ends of the spiral heat exchange tube extend to the outside of the hollow tower body and are connected to refrigerant connector pipes.

[0015] Preferably, a raised connecting platform is provided in the middle of the upper surface of the top cover, the mechanical seal structure is installed in the middle of the raised connecting platform, the rotating shaft is inserted through the mechanical seal structure, a motor base is installed on the upper periphery of the raised connecting platform, and the drive motor is fixedly installed on the upper end of the motor base.

[0016] Preferably, the mechanical seal structure includes a support ring fixedly installed in the middle of the upper convex connecting platform, a lower insert ring connected to the bottom of the support ring, a fixed ring fixedly connected to the upper surface of the support ring, a lower movable contact ring elastically connected to the upper part of the fixed ring, and an upper sleeve ring slidably sleeved on the fixed ring. A shaft connecting ring is connected to the upper part of the upper sleeve ring, an upper fixed contact ring is embedded inside the upper sleeve ring, and the lower surface of the upper fixed contact ring contacts the upper surface of the lower movable contact ring. The rotating shaft passes through the shaft connecting ring, the upper sleeve ring, the upper fixed contact ring, the lower movable contact ring, the fixed ring, the support ring, and the lower insert ring.

[0017] A sealing ring one is provided on the inner wall of the fixed ring. The sealing ring is sleeved on the lower outer wall of the lower movable contact ring. A sealing ring two is sleeved on the outer wall of the lower insertion ring. The sealing ring two is sealed and fitted to the corresponding position of the upper convex connecting platform. A sealing ring three is provided on the inner side wall of the upper fixed contact ring. A sealing ring four is provided on the outer side wall of the upper fixed contact ring. The sealing ring four is fitted to the inner wall of the upper sleeve ring. The sealing ring three is fitted to the outer wall of the rotating shaft. Fastening screws are screwed onto the side walls of the shaft connecting ring and the upper sleeve ring. The fastening screws on the shaft connecting ring and the upper sleeve ring are respectively connected to the outer wall of the rotating shaft and the outer wall of the upper fixed contact ring.

[0018] Preferably, the lower movable contact ring is inserted into the fixed ring, and a spring and a sliding post are connected to the lower side of the upper outer edge of the lower movable contact ring. An opening is provided on the upper surface of the fixed ring to cooperate with the spring and the sliding post.

[0019] Preferably, a bearing is embedded in the lower end of the lower insertion ring, and the bearing is supported on the outer wall of the rotating shaft.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This solution adds a drive motor, rotating shaft, stirring rod, and mechanical seal to some existing vacuum distillation kettles that do not have a stirring structure. This allows for the agitation of the material inside the vacuum distillation kettle, ensuring uniform heating and avoiding problems such as uneven separation and low efficiency.

[0022] The mechanical seal structure effectively seals the connection between the rotating shaft and the upper convex connecting platform, preventing air leakage and ensuring a vacuum state inside the vacuum distillation kettle. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of the hollow vessel body of this utility model;

[0025] Figure 3 This is a schematic diagram of the internal structure of the hollow tower body of this utility model;

[0026] Figure 4 This is a schematic diagram of the split structure of the motor base and the upper protruding connecting platform of this utility model;

[0027] Figure 5 This is a schematic diagram of the split structure of the mechanical seal structure of this utility model;

[0028] Figure 6 This is a schematic diagram of the separate structure of the upper sleeve, shaft connecting ring, and upper fixed contact ring of this utility model.

[0029] In the diagram: 1. Mounting bracket; 2. Hollow vessel body; 3. Controller; 4. Hollow thermally conductive jacket; 5. Hot fluid interface; 6. Discharge pipe; 7. Valve 1; 8. Temperature sensor; 9. Upper connection part; 10. Top cover; 11. Pressure gauge; 12. Feed pipe; 13. Upper protruding connecting platform; 14. Motor base; 15. Drive motor; 16. Rotating shaft; 17. Stirring rod; 18. Fixing ring; 19. Support ring; 20. Lower insertion ring; 21. Sealing ring 2; 22. Shaft 23. Sealing ring 1; 24. Lower movable contact ring; 25. Sliding column; 26. Spring; 27. Upper sleeve ring; 28. Shaft connecting ring; 29. ​​Upper fixed contact ring; 30. Sealing ring 4; 31. Sealing ring 3; 32. Vacuum suction pipe; 33. Cooling central chamber; 34. Drain pipe; 35. Valve 2; 36. Connecting pipe; 37. Hollow tower body; 38. Spiral heat exchange tube; 39. Refrigerant connector pipe; 40. Vacuum tube; 41. Fastening screw; 42. Opening. Detailed Implementation

[0030] 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.

[0031] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example 1

[0032] Please see Figure 1-6 This utility model provides a technical solution: a mechanically sealed vacuum distillation vessel, comprising: a hollow vessel body 2, a controller 3, a hollow thermally conductive jacket 4, a hot fluid interface 5, an upper connecting part 9, a top cover 10, and a rotating shaft 16;

[0033] The hollow heat-conducting jacket 4 is disposed on the side wall of the hollow vessel body 2. The hot fluid interface 5 is connected to the upper and lower sides of the outer wall of the hollow heat-conducting jacket 4, and the upper and lower hot fluid interfaces 5 are in communication with the hollow heat-conducting jacket 4. The upper end of the hollow vessel body 2 is connected to the upper connecting part 9, and the upper part of the upper connecting part 9 is sealed to the top cover 10. The rotating shaft 16 is longitudinally rotatably connected to the top cover 10, and a mechanical seal structure is provided at the connection between the rotating shaft 16 and the top cover 10. The upper part of the top cover 10 is provided with a mechanism for driving the rotating shaft 16 to rotate. The rotating drive motor 15 has a rotating shaft 16 whose bottom end extends to the hollow vessel body 2 and is connected to a stirring rod 17; the bottom of the hollow vessel body 2 is provided with a discharge pipe 6, and a valve 7 is installed on the discharge pipe 6; the upper surface of the top cover 10 is connected to a feed pipe 12, a vacuum suction cooling assembly and a pressure gauge 11; a temperature sensor 8 is provided on the side wall of the hollow vessel body 2, the detection end of the temperature sensor 8 extends into the interior of the hollow vessel body 2, and the signal output end of the temperature sensor 8 is connected to the controller 3.

[0034] Analysis of the above content: During vacuum distillation, the feed pipe 12 is connected to the external material output pipe. The material enters the hollow vessel 2 through the feed pipe 12 (the feed pipe 12 is closed after use). Hot fluid is filled into the hollow heat-conducting jacket 4 through the lower hot fluid interface 5. After the hot fluid heats the material in the hollow vessel 2, the hot fluid is output from the upper hot fluid interface 5.

[0035] Temperature sensor 8 monitors the temperature of the material inside the hollow vessel 2 in real time, presets the temperature range that the material should meet, and stores it in controller 3. When temperature sensor 8 detects that the temperature of the material inside the hollow vessel 2 is too high or too low, controller 3 outputs control to adjust the pumping speed of the pump that draws in the hot fluid (controller 3 controls the motor speed of the pump; in the prior art, the two are connected by wired electricity, and controller 3 adjusts the speed by changing the motor input current of the pump according to the feedback signal of temperature sensor 8, which will not be elaborated here). During the separation process, drive motor 15 drives the stirring rod 17 to rotate based on the rotating shaft 16. The stirring rod 17 stirs the material inside the hollow vessel 2, making the material evenly mixed. In this way, the material at each position is separated by heat during separation.

[0036] The vacuum suction cooling assembly evacuates the hollow vessel 2, while simultaneously extracting and cooling the separated components, separating them from the extracted air. Example 2

[0037] Please see Figure 1-6 The present invention provides a technical solution based on Embodiment 1: it further includes a mounting bracket 1, which is installed on the outer wall of the hollow vessel body 2, and the bottom of the controller 3 is supported on the mounting bracket 1.

[0038] Analysis of the above content: The mounting bracket 1 is used to support the hollow vessel body 2, so that the hollow vessel body 2 is installed stably and the height of the discharge pipe 6 is increased. Example 3

[0039] Please see Figure 1-6 This utility model provides a technical solution based on Embodiment 1: the vacuum suction cooling assembly includes a vacuum suction pipe 32 connected to the top cover 10, the end of the vacuum suction pipe 32 away from the top cover 10 is connected to a cooling central chamber 33, the upper part of the cooling central chamber 33 is connected to a connecting pipe 36, the upper end of the connecting pipe 36 is connected to a cooling heat exchange tower, the upper end of the cooling heat exchange tower is connected to a vacuum pipe 40, and the vacuum pipe 40 is externally connected to a vacuum pump.

[0040] Analysis of the above content: The vacuum pump creates a vacuum inside the hollow vessel 2 through the vacuum pipe 40, connecting pipe 36, and vacuum suction pipe 32. The evaporated material enters the cooling heat exchange tower for cooling, concentrating the cooled evaporated material components. If the connecting pipe 36 simultaneously flows through the evaporated material and the cooled material, causing obstruction, two connecting pipes 36 can be set. One end of the additional connecting pipe 36 is connected to the vacuum suction pipe 32, and the other end is connected to the cooling heat exchange tower. In this way, the evaporated material directly enters the cooling heat exchange tower through this connecting pipe 36, and the condensed material in the cooling heat exchange tower falls into the cooling concentration chamber 33 through the other connecting pipe 36. Example 4

[0041] Please see Figure 1-6 Based on Embodiment 3, this utility model provides a technical solution: the bottom of the cooling central chamber 33 is connected to a drain pipe 34, and a valve 35 is installed on the drain pipe 34.

[0042] Analysis of the above content: Open valve 2 35, and discharge and collect the material in the cooling collection chamber 33 through the drain pipe 34. Example 5

[0043] Please see Figure 1-6 Based on Embodiment 3, this utility model provides a technical solution: the cooling heat exchange tower includes a hollow tower body 37, and a spiral heat exchange tube 38 is provided inside the hollow tower body 37. The spiral heat exchange tube 38 is made of aluminum or copper, and both ends of the spiral heat exchange tube 38 extend to the outside of the hollow tower body 37 and are connected to a refrigerant connector pipe 39.

[0044] Analysis of the above content: Low-temperature liquid is introduced into the spiral heat exchange tube 38. The low-temperature liquid comes into contact with the evaporated material (which has a higher temperature) to exchange heat, causing the evaporated material to condense. Example 6

[0045] Please see Figure 1-6 Based on Embodiment 1, this utility model provides a technical solution: a raised connecting platform 13 is provided in the middle of the upper surface of the top cover 10, the mechanical seal structure is installed in the middle of the raised connecting platform 13, the rotating shaft 16 is inserted through the mechanical seal structure, a motor base 14 is installed on the upper periphery of the raised connecting platform 13, and the drive motor 15 is fixedly installed on the upper end of the motor base 14.

[0046] The mechanical seal structure includes a support ring 19 fixedly installed in the middle of the upper convex connecting platform 13. The bottom of the support ring 19 is connected to a lower insertion ring 20. The upper surface of the support ring 19 is fixedly connected to a fixing ring 18. The upper part of the fixing ring 18 is elastically connected to a lower movable contact ring 24. The mechanical seal structure also includes an upper sleeve ring 27, which is slidably sleeved on the fixing ring 18. The upper part of the upper sleeve ring 27 is connected to a shaft connecting ring 28. An upper fixed contact ring 29 is embedded inside the upper sleeve ring 27. The lower surface of the upper fixed contact ring 29 contacts the upper surface of the lower movable contact ring 24. The rotating shaft 16 passes through the shaft connecting ring 28, the upper sleeve ring 27, the upper fixed contact ring 29, the lower movable contact ring 24, the fixing ring 18, the support ring 19, and the lower insertion ring 20.

[0047] A sealing ring 23 is provided on the inner wall of the fixed ring 18. The sealing ring 23 is sleeved on the lower outer wall of the lower movable contact ring 24. A sealing ring 21 is sleeved on the outer wall of the lower insertion ring 20. The sealing ring 21 is sealed and fitted to the corresponding position of the upper convex connecting platform 13. A sealing ring 31 is provided on the inner side wall of the upper fixed contact ring 29. A sealing ring 40 is provided on the outer side wall of the upper fixed contact ring 29. The sealing ring 40 is fitted to the inner wall of the upper sleeve ring 27. The sealing ring 31 is fitted to the outer wall of the rotating shaft 16. Fastening screws 41 are screwed onto the side walls of the shaft connecting ring 28 and the upper sleeve ring 27. The fastening screws 41 on the shaft connecting ring 28 and the upper sleeve ring 27 are respectively connected to the outer wall of the rotating shaft 16 and the outer wall of the upper fixed contact ring 29.

[0048] Analysis of the above: When the rotating shaft 16 rotates, it drives the shaft connecting ring 28, the upper sleeve ring 27, and the upper fixed contact ring 29 to rotate. The lower part of the upper fixed contact ring 29 contacts and seals with the lower movable contact ring 24, forming a sealing structure between them. Based on the setting of other sealing rings, sealing at other positions is ensured. Thus, when the rotating shaft 16 rotates, the gap at the connection between the rotating shaft 16 and the upper convex connecting platform 13 is sealed.

[0049] The contact surfaces of the upper fixed contact ring 29 and the lower movable contact ring 24 are precision ground with a roughness of no more than 0.8μm, and are coated with high-temperature resistant grease to reduce friction and enhance sealing. Example 7

[0050] Please see Figure 1-6 Based on Embodiment Six, this utility model provides a technical solution: the lower movable contact ring 24 is inserted into the fixed ring 18, the lower side of the upper outer edge of the lower movable contact ring 24 is connected to a spring 26 and a sliding post 25, and the upper surface of the fixed ring 18 is provided with an opening 42 that cooperates with the spring 26 and the sliding post 25.

[0051] Analysis of the above content: By using elastic support, the fixed ring 18 and the lower movable contact ring 24 can make elastic contact and dynamically adjust to ensure the contact effect. Example 8

[0052] Please see Figure 1-6 Based on Embodiment Six, this utility model provides a technical solution: a bearing 22 is embedded in the lower end of the lower insertion ring 20, and the bearing 22 is supported on the outer wall of the rotating shaft 16.

[0053] Analysis of the above content: Bearing 22 is used to support the rotating shaft 16, so that the rotating shaft 16 can operate smoothly.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model, and no reference numerals in the claims should be considered as limiting the scope of the claims.

[0055] 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 mechanically sealed vacuum retort, characterized by, include: Hollow vessel body (2), controller (3), hollow heat-conducting jacket (4), hot fluid interface (5), upper connection part (9), top cover (10) and rotating shaft (16); The hollow thermally conductive jacket (4) is disposed on the side wall of the hollow vessel body (2), and the hot fluid interface (5) is connected to the upper and lower sides of the outer wall of the hollow thermally conductive jacket (4), and the hot fluid interface (5) on the upper and lower sides is connected to the hollow thermally conductive jacket (4). The upper end of the hollow vessel body (2) is connected to the upper connecting part (9), the upper part of the upper connecting part (9) is sealed to the top cover (10), the rotating shaft (16) is longitudinally rotatably connected to the top cover (10), and a mechanical seal structure is provided at the connection between the rotating shaft (16) and the top cover (10). The upper part of the top cover (10) is provided with a drive motor (15) for driving the rotating shaft (16) to rotate, and the bottom end of the rotating shaft (16) extends to the hollow vessel body (2) and is connected to a stirring rod (17). The bottom of the hollow vessel body (2) is provided with a discharge pipe (6), and a valve (7) is installed on the discharge pipe (6). The upper surface of the top cover (10) is connected to a feed pipe (12), a vacuum suction cooling assembly and a pressure gauge (11). A temperature sensor (8) is provided on the side wall of the hollow vessel body (2). The detection end of the temperature sensor (8) extends into the hollow vessel body (2). The signal output end of the temperature sensor (8) is connected to the controller (3).

2. A mechanically sealed vacuum retort according to claim 1, wherein: It also includes a mounting bracket (1), which is installed on the outer wall of the hollow vessel body (2), and the bottom of the controller (3) is supported on the mounting bracket (1).

3. A mechanically sealed vacuum retort according to claim 1, wherein: The vacuum suction cooling assembly includes a vacuum suction pipe (32) connected to the top cover (10). The end of the vacuum suction pipe (32) away from the top cover (10) is connected to a cooling central chamber (33). The upper part of the cooling central chamber (33) is connected to a connecting pipe (36). The upper end of the connecting pipe (36) is connected to a cooling heat exchange tower. The upper end of the cooling heat exchange tower is connected to a vacuum pipe (40). The vacuum pipe (40) is externally connected to a vacuum pump.

4. A mechanically sealed vacuum retort according to claim 3, wherein: The bottom of the cooling central chamber (33) is connected to a drain pipe (34), and a valve (35) is installed on the drain pipe (34).

5. A mechanically sealed vacuum retort according to claim 3, wherein: The cooling heat exchange tower includes a hollow tower body (37), and a spiral heat exchange tube (38) is provided inside the hollow tower body (37). The spiral heat exchange tube (38) is made of aluminum or copper. Both ends of the spiral heat exchange tube (38) extend to the outside of the hollow tower body (37) and are connected to a refrigerant connector pipe (39).

6. A mechanically sealed vacuum retort according to claim 1, wherein: The top cover (10) has an upper convex connecting platform (13) in the middle of its upper surface. The mechanical seal structure is installed in the middle of the upper convex connecting platform (13). The rotating shaft (16) is inserted through the mechanical seal structure. The upper periphery of the upper convex connecting platform (13) is equipped with a motor seat (14). The drive motor (15) is fixedly installed at the upper end of the motor seat (14).

7. A mechanically sealed vacuum retort according to claim 6, wherein: The mechanical seal structure includes a support ring (19) fixedly installed in the middle of the upper convex connecting platform (13). The bottom of the support ring (19) is connected to a lower insert ring (20). The upper surface of the support ring (19) is fixedly connected to a fixing ring (18). The upper part of the fixing ring (18) is elastically connected to a lower movable contact ring (24). The mechanical seal structure also includes an upper sleeve ring (27). The upper sleeve ring (27) is slidably sleeved on the fixing ring (18). The upper part of the upper sleeve ring (27) is connected to a shaft connecting ring (28). An upper fixed contact ring (29) is embedded inside the upper sleeve ring (27). The lower surface of the upper fixed contact ring (29) contacts the upper surface of the lower movable contact ring (24). The rotating shaft (16) passes through the shaft connecting ring (28), the upper sleeve ring (27), the upper fixed contact ring (29), the lower movable contact ring (24), the fixing ring (18), the support ring (19), and the lower insert ring (20). A sealing ring one (23) is provided on the inner wall of the fixed ring (18). The sealing ring one (23) is sleeved on the lower outer wall of the lower movable contact ring (24). A sealing ring two (21) is sleeved on the outer wall of the lower insertion ring (20). The sealing ring two (21) is sealed and fitted with the upper convex connecting platform (13) at the corresponding position. A sealing ring three (31) is provided on the inner wall of the upper fixed contact ring (29). A sealing ring four (30) is provided on the side wall. The sealing ring four (30) fits against the inner wall of the upper sleeve (27). The sealing ring three (31) fits against the outer wall of the rotating shaft (16). Fastening screws (41) are screwed onto the side walls of the shaft connecting ring (28) and the upper sleeve (27). The fastening screws (41) on the shaft connecting ring (28) and the upper sleeve (27) are respectively connected to the outer wall of the rotating shaft (16) and the outer wall of the upper fixed contact ring (29).

8. A mechanically sealed vacuum retort according to claim 7, wherein: The lower movable contact ring (24) is inserted into the fixed ring (18) at its lower middle side. The lower outer edge of the upper movable contact ring (24) is connected to a spring (26) and a sliding post (25). The upper surface of the fixed ring (18) is provided with an opening (42) that cooperates with the spring (26) and the sliding post (25).

9. A mechanically sealed vacuum distillation still according to claim 7, characterized in that: The lower end of the lower insertion ring (20) is embedded with a bearing (22), which is supported on the outer wall of the rotating shaft (16).

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