Heat insulation structure for preventing gas phase heat from influencing mechanical seal for film evaporator
By introducing a heat insulation structure and a cooling water chamber into the thin-film evaporator, the problem of mechanical seal sealing at high temperatures is solved, achieving effective heat insulation, extending the mechanical seal life, and maintaining the normal operation of the evaporator.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 无锡力马化工机械有限公司
- Filing Date
- 2025-05-21
- Publication Date
- 2026-04-28
AI Technical Summary
In existing thin-film evaporators, the sealing performance of the mechanical seal is affected by the heat in the gas phase under high-temperature conditions, resulting in limited heat resistance of the O-ring. The cooling scheme also has a low-temperature zone that affects the normal operation of the evaporator.
The thermal insulation structure includes a thermal insulation frame and a thermal insulation sleeve, combined with a cooling water cavity, thermal insulation materials, and a non-metallic self-lubricating thermal insulation ring to reduce the entry of high-temperature gas into the mechanical seal area and reduce the impact of thermal radiation.
It effectively isolates hot and cold environments, extends the service life of mechanical seals, prevents cooling water from damaging the high-temperature environment, and ensures the normal operation of the evaporator.
Smart Images
Figure CN224166912U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of thin-film evaporator technology and relates to a heat insulation structure for preventing gas phase heat from affecting the mechanical seal in a thin-film evaporator. Background Technology
[0002] In thin-film evaporators operating at high temperatures, the mechanical seals used to seal the gap between the flat cover and the rotating shaft require extremely high precision. Since the O-rings inside the mechanical seals are primarily made of rubber, their heat resistance is limited. Therefore, cooling the mechanical seals used in thin-film evaporators is essential.
[0003] Traditional cooling solutions involve installing cooling jackets on the mechanical seal, but when the temperature is too high, the high-temperature steam still poses a significant risk to the O-rings of the mechanical seal. Furthermore, the use of excessive cooling water can create a low-temperature zone in the mechanical seal area, adversely affecting the high-temperature environment inside the thin-film evaporator. Summary of the Invention
[0004] The purpose of this invention is to provide a heat insulation structure for thin-film evaporators to prevent gas phase heat from affecting the mechanical seal, thereby solving the above-mentioned problems.
[0005] According to the technical solution provided by this utility model: a heat insulation structure for preventing gas phase heat from affecting the mechanical seal in a thin-film evaporator includes a frame, which is connected to a flat cover. The flat cover is installed on the top of the evaporation cylinder. A stirring shaft is rotatably installed in the frame, the flat cover, and the evaporation cylinder. A mechanical seal is used to seal between the flat cover and the stirring shaft. The mechanical seal is located at the top of the flat cover. A first mechanical seal protection structure is provided in the flat cover, and a second mechanical seal protection structure is provided in the evaporation cylinder. The first mechanical seal protection structure is a cooling water chamber. The second mechanical seal protection structure includes a heat insulation frame, which is fixed to the bottom of the flat cover. A heat insulation sleeve is placed in the heat insulation frame.
[0006] As a further improvement of this utility model, a cooling water cavity is arranged on the upper part of the flat cover.
[0007] As a further improvement of this utility model, the heat insulation sleeve is made of heat insulation material.
[0008] As a further improvement of this utility model, the single-sided gap between the inner ring of the heat insulation frame and the stirring shaft is less than or equal to 5mm, and the gap between the outer side of the heat insulation frame and the evaporation cylinder is less than or equal to 10mm.
[0009] As a further improvement of this utility model, several heat insulation rings are added to the upper part of the inner ring of the heat insulation frame.
[0010] As a further improvement of this utility model, the outer diameter of the heat insulation ring is fitted with a gap in the heat insulation frame.
[0011] As a further improvement of this utility model, the heat insulation ring is made of a non-metallic self-lubricating material.
[0012] As a further improvement of this utility model, a flat cover spacer is provided on the upper edge of the flat cover near the machine seal.
[0013] As a further improvement of this utility model, the outer surface of the heat insulation frame is polished to 0.4μm or less.
[0014] As a further improvement of this utility model, a feed inlet is provided on the side of the evaporator body, and the feed inlet is located below the heat insulation frame.
[0015] The positive and progressive effects of this application are as follows:
[0016] This invention extensively utilizes heat insulation sleeves (such as heat insulation cotton) on the inner side of the equipment to isolate the hot and cold environments, preventing high-temperature gases from entering the mechanical seal area and reducing the impact of internal heat radiation on the mechanical seal. This significantly alleviates the temperature environment at the mechanical seal and extends its service life. Simultaneously, the heat insulation sleeves prevent cooling water in the flat cover from disrupting the high-temperature environment inside the cylinder and affecting the normal operation of the evaporator. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of this utility model.
[0018] Figure 2 for Figure 1 An enlarged schematic diagram of region A in the middle. Detailed Implementation
[0019] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.
[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this utility model described herein. Furthermore, terms such as "comprising" and "having" mean that in addition to those already listed in "comprising" and "having," other unlisted contents may also be included; for example, a process, method, system, product, or device may include a series of steps or units, not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.
[0022] Due to the angle of the drawing, some parts may not be drawn, but their positions and connections can be understood from the text descriptions.
[0023] like Figure 1 As shown, this utility model is a heat insulation structure for preventing gas phase heat from affecting the mechanical seal in a thin film evaporator. It includes a frame 2, which is connected to a flat cover 4. The flat cover 4 is installed on the top of the evaporation cylinder 6. A stirring shaft 9 is rotatably installed in the frame 2, the flat cover 4, and the evaporation cylinder 6. A mechanical seal 3 is used to seal between the flat cover 4 and the stirring shaft 9. The mechanical seal 3 is located at the top of the flat cover 4. A first mechanical seal protection structure is provided in the flat cover 4, and a second mechanical seal protection structure is provided in the evaporation cylinder 6.
[0024] The first mechanical seal protection structure is a cooling water chamber. The cooling water chamber is arranged on the upper part of the flat cover 4, and the inlet and outlet of the cooling water are arranged at the cooling water chamber so that the cooling water can circulate and cool.
[0025] like Figure 2 As shown, the second mechanical seal protection structure includes a heat insulation frame 7, which is fixed to the bottom of the flat cover 4, and a heat insulation sleeve 8 is placed in the heat insulation frame 7.
[0026] The heat insulation sleeve 8 is made of heat insulation materials such as thermal insulation cotton. Since this area (above the feed inlet) inside the film equipment is full of gas, it will not cause material contamination.
[0027] The single-sided gap between the inner ring of the heat insulation frame 7 and the stirring shaft 9 is less than or equal to 5 mm, and the gap between the outer side of the heat insulation frame 7 and the evaporation cylinder 6 is less than or equal to 10 mm. This is because, compared to the inner part, the hot air on the outer part is less likely to affect the mechanical seal 3.
[0028] Several heat-insulating rings 10 are added to the upper part of the inner ring of the heat-insulating frame 7 to further reduce the amount of high-temperature gas passing through. The outer diameter of the heat-insulating rings 10 is fitted with the heat-insulating frame 7 with a clearance. The clearance between the inner diameter of the heat-insulating rings 10 and the stirring shaft 9 on one side is less than or equal to 0.1mm. The total height of the heat-insulating rings 10 should preferably be within 200mm to avoid excessive contact between the stirring shaft 9 and the heat-insulating rings 10, which could cause excessive impact and unstable equipment operation.
[0029] The heat insulation ring 10 is made of a non-metallic self-lubricating material, such as PTFE or graphite, to prevent damage to the stirring shaft 9.
[0030] The gap between the inner diameter of the flat cover 4 and the stirring shaft 9 is less than 2mm on one side, so that some of the high-temperature gas passing through can be cooled by the flat cover 4.
[0031] On the upper edge of the flat cover 4, near the mechanical seal 3, a final flat cover spacer 11 (the height of the flat cover spacer 11 is less than 50mm) is installed to block the passage of hot gas again, increasing the cooling time of the flat cover 4 for the passing high-temperature gas.
[0032] The outer surface of the thermal insulation frame 7 is polished to 0.4μm or less to reduce heat radiation.
[0033] The evaporator cylinder 6 has a feed inlet 6-1 on its side. The feed inlet 6-1 is located below the heat insulation frame 7 to prevent the heat insulation sleeve 8 from contaminating the feed material.
[0034] The stirring shaft 9 is driven by the reducer 1 and is fixedly mounted on the frame 2.
[0035] The frame 2 is rotatably connected to the stirring shaft 9 via bearings.
[0036] The working process of this utility model is as follows:
[0037] Cooling water is introduced into the cooling water inlet of the flat cover 4.
[0038] When the equipment is in normal operation and materials are introduced, high-temperature steam is generated. Most of the high-temperature steam is blocked by the heat insulation frame 7, and a small amount of high-temperature gas rises along the gap between the heat insulation frame 7 and the inner cylinder and is cooled after encountering the cooling flat cover 4.
[0039] A small amount of high-temperature gas rises along the gap between the heat insulation frame 7 and the stirring shaft 9. Because the gap is small, the amount of gas passing through is not large.
[0040] The gas rises to the position of the heat insulation ring 10 and is blocked again, so even less high-temperature gas passes through the heat insulation ring 10.
[0041] High-temperature gas enters the flat cover 4 through the heat insulation ring 10. Since there is another flat cover ring 11 on the upper edge of the flat cover 4, the small amount of high-temperature gas that enters the low-temperature zone of the flat cover 4 is retained here and continuously cooled.
[0042] Due to the presence of the heat insulation frame 7, the cooling environment of the flat cover 4 will not affect the high-temperature working environment under the heat insulation frame 7, and will not affect the normal evaporation operation.
[0043] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.
Claims
1. A heat insulation structure for preventing gas phase heat from affecting the mechanical seal in a thin-film evaporator, comprising a frame (2), the frame (2) being connected to a flat cover (4), the flat cover (4) being installed on the top of an evaporation cylinder (6), and a stirring shaft (9) being rotatably disposed in the frame (2), the flat cover (4), and the evaporation cylinder (6), characterized in that, The flat cover (4) and the stirring shaft (9) are sealed by a mechanical seal (3). The mechanical seal (3) is located at the top of the flat cover (4). The flat cover (4) is provided with a first mechanical seal protection structure, and the evaporation cylinder (6) is provided with a second mechanical seal protection structure. The first mechanical seal protection structure is a cooling water chamber. The second mechanical seal protection structure includes a heat insulation frame (7). The heat insulation frame (7) is fixed at the bottom of the flat cover (4), and a heat insulation sleeve (8) is placed in the heat insulation frame (7).
2. The thermal insulation structure for preventing gas-phase heat from affecting the mechanical seal in a thin-film evaporator as described in claim 1, characterized in that, The upper part of the flat cover (4) is equipped with a cooling water chamber.
3. The thermal insulation structure for preventing gas-phase heat from affecting the mechanical seal in a thin-film evaporator as described in claim 1, characterized in that, The heat insulation sleeve (8) is made of heat insulation material.
4. The thermal insulation structure for preventing gas-phase heat from affecting the mechanical seal in a thin-film evaporator as described in claim 1, characterized in that, The gap between the inner ring of the heat insulation frame (7) and the stirring shaft (9) on one side is less than or equal to 5 mm, and the gap between the outer side of the heat insulation frame (7) and the evaporation cylinder (6) is less than or equal to 10 mm.
5. The thermal insulation structure for preventing gas-phase heat from affecting the mechanical seal in a thin-film evaporator as described in claim 1, characterized in that, Several heat insulation rings (10) are added to the upper part of the inner ring of the heat insulation frame (7).
6. The thermal insulation structure for preventing gas-phase heat from affecting the mechanical seal in a thin-film evaporator as described in claim 5, characterized in that, The outer diameter of the heat insulation ring (10) is fitted with the heat insulation frame (7) with a clearance.
7. The thermal insulation structure for preventing gas-phase heat from affecting the mechanical seal in a thin-film evaporator as described in claim 5, characterized in that, The heat insulation ring (10) is made of non-metallic self-lubricating material.
8. The thermal insulation structure for preventing gas-phase heat from affecting the mechanical seal in a thin-film evaporator as described in claim 1, characterized in that, A flat cover spacer (11) is installed on the upper edge of the flat cover (4) near the machine seal (3).
9. The thermal insulation structure for preventing gas-phase heat from affecting the mechanical seal in a thin-film evaporator as described in claim 1, characterized in that, The outer surface of the thermal insulation frame (7) is polished to 0.4 μm or less.
10. The thermal insulation structure for preventing gas-phase heat from affecting the mechanical seal in a thin-film evaporator as described in claim 1, characterized in that, The evaporator cylinder (6) has a feed inlet (6-1) on its side, and the feed inlet (6-1) is located below the heat insulation frame (7).