Sealing structure of mandrel of film evaporator
By adding bearings and sealing structures to the core shaft of the thin film evaporator, the axial movement problem caused by alternating positive and negative pressure loads is solved, the sealing performance and mechanical seal life are improved, and the stable operation and cleaning effect of the equipment are ensured.
Patent Information
- Application Number
- CN202422854727.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-11-21
AI Technical Summary
The core shaft of the existing thin film evaporator has axial movement under the alternating positive and negative pressure loads, which leads to failure of the sealing end face and shortened mechanical seal life.
A bearing is added to the core shaft of the thin film evaporator, and a sealing structure is set at both ends of the bearing, including inner and outer skeleton oil seals, to form an effective sealing system to offset the alternating load, and achieve cleaning and isolation through the shaft seal fixing seat.
It effectively reduces the axial movement and radial swing at the sealing end face, prolongs the service life of the mechanical seal, enhances the sealing performance and operation stability, and prevents the cleaning fluid from contaminating the bearing and the wear debris from entering the material.
Smart Images
Figure CN223392902U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thin film evaporators, in particular to a sealing structure of a core shaft of a thin film evaporator. Background Art
[0002] Sterile-grade thin-film evaporators must ensure a sterile environment inside. When the equipment is working normally, it is under negative pressure. When cleaning and sterilizing, it is under positive pressure. Positive and negative pressure conditions will generate axial positive and negative alternating loads on the main shaft of the equipment. In other words, there are positive and negative alternating loads inside the equipment, so there is a large alternating axial load. In this case, the alternating axial load will generate a bidirectional push and pull force on the core shaft, which will also cause axial movement of the core shaft. From the perspective of the entire structure, the equipment rotates at high speed inside, and there are also large positive and negative alternating loads inside. In addition, the sealing end face is not allowed to have a large amount of axial movement. If the axial movement is too large, on the one hand, it will not play the role of sealing, and on the other hand, the life of the mechanical seal will be greatly shortened. Utility Model Content
[0003] The technical problem to be solved by the present invention is: in order to solve the technical problem of axial movement at the sealing end face in the prior art, the present invention provides a sealing structure for the core shaft of a thin film evaporator, adds bearings between the sealing parts, and seals both ends of the bearings, thereby effectively reducing the axial movement and radial swing at the sealing end face and improving the service life of the mechanical seal.
[0004] The technical solution adopted by the utility model to solve its technical problems is: a sealing structure of the core shaft of a thin film evaporator, comprising a core shaft, an inner shaft sleeve on the outer side of the core shaft, an outer shaft sleeve sealingly connected to the outer side of the inner shaft sleeve, a bearing connected to the outer side of the outer shaft sleeve, a pressure cover connected to the outer side of the bearing, an inner skeleton oil seal provided on the left side of the bearing, and an outer skeleton oil seal provided on the right side of the bearing.
[0005] Furthermore, in order to seal both ends of the bearing, the outer surface of the outer sleeve has a step structure, and the bearing and the outer skeleton oil seal are sequentially arranged on the step structure.
[0006] Furthermore, the inner skeleton oil seal and the side skeleton oil seal are located between the outer shaft sleeve and the gland, and the inner skeleton oil seal is arranged on the inner side of the shaft seal fixing seat.
[0007] Furthermore, in order to be able to clean the inside of the seal, a shaft seal fixing seat is provided on the outside of the inner sleeve, and a material side static ring and an atmosphere side static ring are also provided between the inner sleeve and the shaft seal fixing seat. A gap channel is formed between the material side static ring and the atmosphere side static ring and the inner sleeve, and the shaft seal fixing seat has a flushing inlet and a flushing outlet connected to the gap channel.
[0008] Furthermore, in order to prevent the cleaning fluid from entering the bearing, the inner skeleton oil seal isolates the bearing from the atmospheric side static ring.
[0009] Furthermore, the shaft seal fixing seat is located on the left side of the gland, and the end planes of the gland and the shaft seal fixing seat are sealed.
[0010] Furthermore, the flushing inlet is provided in the lower half of the shaft seal fixing seat, and the upper end of the flushing inlet faces the static ring on the atmosphere side.
[0011] Furthermore, the flushing outlet is provided in the upper half of the shaft seal fixing seat, and the lower end of the flushing outlet faces the material-side static ring.
[0012] Compared with the prior art, the beneficial effects of the present invention are:
[0013] 1. The sealing structure of the core shaft of the thin film evaporator of the utility model adds a bearing at the end of the inner sleeve and seals both sides of the bearing, thereby effectively reducing the axial movement and radial swing at the sealing end face, improving the service life of the mechanical seal, and providing sealing and operational stability.
[0014] 2. The sealing structure of the core shaft of the thin film evaporator of the utility model isolates the bearing from the cleaning liquid through the inner skeleton oil seal to prevent the cleaning liquid from entering the bearing, and isolates the external environment from the bearing through the outer skeleton oil seal to prevent the bearing from being contaminated by the external environment.
[0015] 3. The sealing structure of the core shaft of the thin film evaporator of the present invention cleans the static ring on the material side and the sealing end group on the atmosphere side through the shaft seal fixing seat, thereby preventing the wear debris from aggravating the damage of the sealing end face of the mechanical seal, and also preventing the wear debris from falling into the material side and contaminating the material. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0017] Figure 1 A schematic diagram of the sealing structure of the core shaft of the thin film evaporator of the present invention;
[0018] In the figure: 1. core shaft, 2. inner sleeve, 3. outer sleeve, 4. bearing, 5. gland, 6. inner skeleton oil seal, 7. outer skeleton oil seal, 8. shaft seal fixing seat, 9. material side static ring, 10. atmosphere side static ring, 11. flushing inlet, 12. flushing outlet. DETAILED DESCRIPTION
[0019] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.
[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.
[0021] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0022] like Figure 1 As shown, a sealing structure of a core shaft of a thin film evaporator includes a core shaft 1, an inner sleeve 2 being provided on the outer side of the core shaft 1. An outer sleeve 3 is sealingly connected to the outer side of the inner sleeve 2. The outer sleeve 3 is located at the right end of the inner sleeve 2.
[0023] The outer side of the outer sleeve 3 is connected to the bearing 4, and the outer side of the bearing 4 is connected to the pressure cover 5. The left side of the bearing 4 is provided with an inner skeleton oil seal 6, and the right side of the bearing 4 is provided with an outer skeleton oil seal 7. The outer surface of the outer sleeve 3 has a stepped structure, and the bearing 4 and the outer skeleton oil seal 7 are sequentially arranged on the stepped structure.
[0024] The inner skeleton oil seal 6 is located inside the shaft seal holder 8, and the outer skeleton oil seal 7 is located between the outer sleeve 3 and the gland 5. The bearing 4 is located away from the material side, offsetting the alternating load on the core shaft 1 through the bearing 4. The bearing 4 is fixed to the outer sleeve 3 and the gland 5. The inner skeleton oil seal 6 isolates the bearing 4 from the left flushing side, preventing cleaning fluid from entering the bearing 4 and also preventing the lubricating grease of the bearing 4 from leaking to the flushing side.
[0025] In order to clean the inside of the seal, a shaft seal fixing seat 8 is provided on the outside of the inner sleeve 2. The shaft seal fixing seat 8 is located on the left side of the gland 5, and the plane of the gland 5 and the shaft seal fixing seat 8 is sealed.
[0026] A material-side static ring 9 and an atmosphere-side static ring 10 are also provided between the inner sleeve 2 and the shaft seal holder 8. The material-side static ring 9 is located on the left side of the inner sleeve 2, forming the material-side sealing end face. The atmosphere-side static ring 10 is located on the left side of the bearing 4, forming the atmosphere-side sealing end face.
[0027] A clearance channel is formed between the material side stationary ring 9 and the atmosphere side stationary ring 10 and the outer side of the inner sleeve 2. The shaft seal fixing seat 8 has a flushing inlet 11 and a flushing outlet 12 connected to the clearance channel. The flushing inlet 11 is opened in the lower half of the shaft seal fixing seat 8, and the upper end of the flushing inlet 11 faces the atmosphere side stationary ring 10. The flushing outlet 12 is opened in the upper half of the shaft seal fixing seat 8, and the lower end of the flushing outlet 12 faces the material side stationary ring 9. Flushing liquid is introduced from the flushing inlet 11 and flows along the Figure 1 In the direction of the middle arrow, the flushing liquid flows through the material-side stationary ring 9 and the atmosphere-side stationary ring 10 on both sides, flows through the inner sides of the material-side stationary ring 9 and the atmosphere-side stationary ring 10, and continues to flow upward before flowing out of the flushing outlet 12. The flushing liquid carries away the wear debris generated on the sealing end face, thereby preventing the wear debris from further damaging the mechanical seal end face and preventing the wear debris from falling into the material side and contaminating the material. The flowing flushing liquid also cools the sealing end face while cleaning, ensuring effective use.
[0028] In summary, the sealing structure of the core shaft of the thin film evaporator of the present invention adds bearings between the seals and seals both ends of the bearings, which effectively reduces the axial movement and radial swing at the sealing end face and improves the service life of the mechanical seal.
[0029] The above description is based on the ideal embodiment of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of this utility model. The technical scope of this utility model is not limited to the content of the specification and must be determined according to the scope of the claims.
Claims
1. A sealing structure for a core shaft of a thin film evaporator, comprising a core shaft (1), wherein the outer side of the core shaft (1) is provided with an inner sleeve (2), characterized in that: The outer side of the inner sleeve (2) is sealedly connected to the outer sleeve (3), the outer side of the outer sleeve (3) is connected to the bearing (4), the outer side of the bearing (4) is connected to the pressure cover (5), the left side of the bearing (4) is provided with an inner skeleton oil seal (6), and the right side of the bearing (4) is provided with an outer skeleton oil seal (7).
2. The sealing structure of the core shaft of the thin film evaporator according to claim 1, characterized in that: The outer surface of the outer shaft sleeve (3) has a step structure, and the bearing (4) and the outer skeleton oil seal (7) are sequentially arranged on the step structure.
3. The sealing structure of the core shaft of the thin film evaporator according to claim 2, characterized in that: The outer skeleton oil seal (7) is arranged between the outer shaft sleeve (3) and the pressure cover (5), and the inner skeleton oil seal (6) is arranged on the inner side of the shaft seal fixing seat (8).
4. The sealing structure of the core shaft of the thin film evaporator according to claim 1, characterized in that: A shaft seal fixing seat (8) is provided on the outer side of the inner shaft sleeve (2), and a material side static ring (9) and an atmosphere side static ring (10) are further provided between the inner shaft sleeve (2) and the shaft seal fixing seat (8). A gap channel is formed between the material side static ring (9) and the atmosphere side static ring (10) and the inner shaft sleeve (2), and a flushing inlet (11) and a flushing outlet (12) are provided on the shaft seal fixing seat (8) and are connected to the gap channel.
5. The sealing structure of the core shaft of the thin film evaporator according to claim 4, characterized in that: The inner skeleton oil seal (6) isolates the bearing (4) from the atmospheric side static ring (10).
6. The sealing structure of the core shaft of the thin film evaporator according to claim 5, characterized in that: The shaft seal fixing seat (8) is located on the left side of the gland (5), and the gland (5) and the shaft seal fixing seat (8) are plane-sealed.
7. The sealing structure of the core shaft of the thin film evaporator according to claim 6, characterized in that: The flushing inlet (11) is opened in the lower half of the shaft seal fixing seat (8), and the upper end of the flushing inlet (11) faces the atmosphere-side static ring (10).
8. The sealing structure of the core shaft of the thin film evaporator according to claim 6, characterized in that: The flushing outlet (12) is provided in the upper half of the shaft seal fixing seat (8), and the lower end of the flushing outlet (12) faces the material-side static ring (9).