A tubular membrane seal based on dehydration of the inner membrane

Abstract

The utility model relates to a kind of tubular membrane sealing structure based on inner membrane dehydration, including pipe end, pressing plate, locking fastener, membrane tube, cylinder, sealing ring, wherein: annular groove is additionally provided to the through-hole outside of the abutment part of pipe end and pressing plate, sealing ring is equipped in annular groove, membrane tube is sleeved in through-hole, sealing ring is sleeved in membrane tube outside.Locking fastener is located in the outer surface of pipe end and pressing plate, and pipe end and pressing plate are compressed and abut by locking fastener.Pipe end and pressing plate are compressed and abut by locking fastener, so that sealing ring occurs deformation under larger pre-tightening pressure, since sealing ring is placed in annular groove, annular groove is rectangular groove, so that sealing ring can be evenly distributed in entire annular groove when extruding deformation, and part is extended in the gap of pipe end and pressing plate, forming sealed environment.At the same time, by the ratio of annular groove groove depth and sealing ring line diameter, the ratio of annular groove groove depth and groove width is adapted proportion, tubular membrane sealing structure for inner membrane dehydration is realized.

Description

Technical Field

[0001] This utility model relates to the field of membrane tube assembly sealing technology, and in particular to a tubular membrane sealing structure based on inner membrane dehydration. Background Technology

[0002] Membrane separation technology combines the functions of separation, concentration, purification, and refining. It is also highly efficient, energy-saving, environmentally friendly, and allows for molecular-level filtration. The filtration process is simple, the equipment is easy to operate and control, and maintenance costs are low and convenient. Therefore, it is now widely used in food, medicine, biology, environmental protection, chemical industry, metallurgy, energy, petroleum, water treatment, electronics, and bionics.

[0003] Membrane modules are the most important equipment in membrane separation technology, and their structures are mainly divided into flat-plate and tubular structures. Shell-and-tube membrane modules have advantages such as simple structure, convenient installation, disassembly, and maintenance, and the ability to withstand high pressure and high temperature conditions, making them widely used in industry. However, because membrane separation technology requires maintaining a pressure or concentration difference across the membrane, and sometimes the pressure and temperature are high, leaks are absolutely unacceptable if a high concentration of organic solvent is to be obtained during the separation process; therefore, high sealing requirements are necessary.

[0004] Existing membrane module sealing structures are mostly based on external membrane dehydration, where the membrane is attached to the outer surface of a tubular carrier, and the masterbatch enters from an inlet perpendicular to the tubular membrane module. The left and right ports of the tubular membrane module are vacuum sides, creating a pressure difference. However, for internal membrane dehydration, where the membrane is attached to the inner surface of the tubular carrier, the feeding method differs. The masterbatch is fed in and discharged from both ports of the tubular membrane module, and the vacuum side is perpendicular to the tubular membrane module. Therefore, sealing structures based on external membrane dehydration are not suitable for internal membrane dehydration, necessitating the design of a tubular membrane sealing structure based on internal membrane dehydration to meet the sealing requirements. Summary of the Invention

[0005] The purpose of this invention is to provide a tubular membrane sealing structure based on inner membrane dehydration to meet sealing requirements.

[0006] To achieve the objective of this utility model, the technical solution is as follows:

[0007] A tubular membrane sealing structure based on inner membrane dehydration includes a tube end, a pressure plate, locking fasteners, a membrane tube, a cylinder, and a sealing ring. The membrane tube is fitted inside the cylinder cavity. The right end of the tube end is fixedly connected to the cylinder, and the left end of the tube end abuts against the right end of the pressure plate. A through hole is formed in the tube end, and an annular groove is formed outside the through hole at the abutment point between the tube end and the pressure plate. The sealing ring is placed inside the annular groove. The membrane tube is fitted inside the through hole, and the sealing ring is fitted outside the membrane tube. The locking fasteners are located on the outer surfaces of the tube end and the pressure plate, and the tube end and the pressure plate are pressed together by the locking fasteners.

[0008] Furthermore, the locking fastener is a nut with internal threads; the outer surface of the pipe end has a matching thread, and the nut is tightened and locked by screwing the internal thread of the nut with the thread on the outer surface of the pipe end, so that the pipe end and the pressure plate are tightly abutted.

[0009] Furthermore, the annular groove located outside the through hole at the junction of the tube end and the pressure plate is connected to the through hole; the outer diameter of the left surface of the annular groove is the same as the outer diameter of the right surface of the annular groove, and the inner diameter of the left surface of the annular groove is the same as the inner diameter of the right surface of the annular groove.

[0010] Furthermore, the ratio of the annular groove depth to the sealing ring diameter is 2:(3-3.5); the ratio of the annular groove depth to the groove width is (2-2.5):2.5. Preferably, the ratio of the annular groove depth to the sealing ring diameter is 2:3.

[0011] Compared with the prior art, the significant advantages of this utility model are:

[0012] The pipe end is pressed tightly against the pressure plate by locking fasteners, causing the sealing ring to deform under significant pre-tightening pressure. Since the sealing ring is placed within an annular groove, which is rectangular, the deformation is evenly distributed throughout the groove and partially extends into the gap between the pipe end and the pressure plate, creating a sealed environment. Whether used as an inlet or outlet, the pressure between the pipe end and the pressure plate acts on the sealing ring evenly, resulting in uniform deformation and excellent sealing performance. Furthermore, by matching the ratio of the annular groove depth to the sealing ring diameter and the ratio of the annular groove depth to the groove width, a tubular membrane sealing structure for liquid phase membrane dehydration is achieved. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the tubular membrane sealing structure based on inner membrane dehydration according to this utility model.

[0014] Among them, 1 is the pressure plate, 2 is the sealing ring, 21 is the annular groove, 3 is the locking fastener, 4 is the tube end, 5 is the cylinder, 6 is the membrane tube, and 7 is the inlet of the membrane module. Detailed Implementation

[0015] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as limiting this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0016] A tubular membrane sealing structure based on inner membrane dehydration includes a tube end 4, a pressure plate 1, a locking fastener 3, a membrane tube 6, a cylinder 5, and a sealing ring 2. The membrane tube 6 is fitted inside the cavity of the cylinder 5. The right end of the tube end 4 is fixedly connected to the cylinder 5, and the left end of the tube end 4 abuts against the right end of the pressure plate 1. A through hole is formed in the tube end 4. An annular groove 21 is formed outside the through hole at the abutment point between the tube end 4 and the pressure plate 1. The sealing ring 2 is placed inside the annular groove 21. The membrane tube 6 is fitted inside the through hole, and the sealing ring 2 is fitted outside the membrane tube 6. The locking fastener 3 is located on the outer surfaces of the tube end 4 and the pressure plate 1, and the tube end 4 and the pressure plate 1 are pressed together by the locking fastener 3. In a specific embodiment, the locking fastener 3 can be a nut with internal threads. The outer surface of the tube end 4 has a matching thread, and the nut is tightened and locked by the internal thread of the nut to the thread on the outer surface of the tube end 4, achieving a tight abutment between the tube end 4 and the pressure plate 1. Furthermore, the nut is a two-step type, and the pressure plate 1 is a three-step type. The stepped protrusion of the nut is engaged with the second and third steps of the pressure plate 1. When the internal thread of the nut is tightened with the thread on the outer surface of the pipe end 4, it drives the pressure plate 1 to make tight contact with the pipe end 4.

[0017] In a specific embodiment, an annular groove 21 located on the outside of the through hole at the contact point between the pipe end 4 and the pressure plate 1 is connected to the through hole. For example... Figure 1As shown in the cross-sectional view of the tubular membrane, the annular groove 21 is rectangular, meaning the outer diameter of the left surface of the annular groove 21 is the same as the outer diameter of the right surface, and the inner diameter of the left surface of the annular groove 21 is the same as the inner diameter of the right surface. Further, the ratio of the groove depth of the annular groove 21 to the diameter of the sealing ring 2 is 2:(3-3.5). In a preferred embodiment, the ratio of the groove depth of the annular groove 21 to the diameter of the sealing ring 2 is 2:3. The ratio of the groove depth to the groove width of the annular groove 21 is (2-2.5):2.5, preferably 2:2.5. The sealing ring 2 is selected from elastic materials, such as perfluoroether, EPDM rubber, fluororubber, etc. The sealing ring 2 allows the membrane tube 6 to be better fitted into the through hole of the tube end 4, and also better seals the feed liquid entering the membrane tube 6. The number of sealing rings 2 is not limited; there can be one or more, as long as the ratio of the diameter of the sealing ring 2 to the groove depth of the annular groove 21 is satisfied. Preferably, the sealing ring 2 can be an O-ring or a rectangular sealing ring. The pre-tightening pressure generated by the locking and squeezing of the pressure plate 1 and the pipe causes the sealing ring 2 to deform under significant pre-tightening pressure. Since the annular groove 21 is a rectangular groove (i.e., the outer diameter of the upper surface of the annular groove 21 is the same as the outer diameter of the lower surface, and the inner diameter of the upper surface of the annular groove 21 is the same as the inner diameter of the lower surface), the deformation of the sealing ring 2 is evenly distributed throughout the annular groove 21 and partially extends into the gap between the pipe end 4 and the pressure plate 1, forming a sealed environment. When the raw material mother liquor enters from one inlet of the membrane module by the pump, the pressure plate 1 further squeezes the pipe end 4, causing the sealing ring 2 to be evenly squeezed within the annular groove 21, forming a sealed environment. When the feed liquid flows out from the membrane module outlet at the other end, the tube end 4 exerts pressure on the pressure plate 1. Since the locking fastener 3 locks both in place, the pressure plate 1 also exerts a reaction force on the tube end 4. Under this reaction force and pressure, the sealing ring 2 is deformed uniformly, especially at the gap between the tube end 4 and the pressure plate 1, where the deformation is uniform and creates a sealed environment. Furthermore, since the vacuum side of the inner membrane module is located perpendicular to the tubular membrane module, a negative pressure is created in the gap between the membrane tube and the cylinder. Using a rectangular groove structure for the annular groove 21 ensures uniform deformation of the sealing ring, which is beneficial for vacuuming. By adapting the rectangular groove structure of the annular groove 21, the ratio of its depth to the diameter of the sealing ring 2, and the ratio of its depth to its width, a tubular membrane sealing structure for liquid phase membrane dehydration is achieved.

[0018] Preferably, the left end of the pressure plate 1 is welded to the inlet 7 of the membrane module to facilitate assembly.

[0019] There is no limit to the number of through holes on the tube end 4; it can be one or more. The tube end 4 can be integral with the cylinder 5 or detachably connected to the end of the cylinder 5, for example, by welding. When there are multiple tube ends 4, there are also multiple membrane tubes 6. Each membrane tube 6 passes through the through hole on each tube end 4 to reach the pressure plate 1.

[0020] The “tube end 4” used in this embodiment is an accessory in the membrane separator that serves to fix the membrane tube 6 and seal the medium. It is usually round and is sometimes referred to as a “tube sheet” or “flower plate”.

[0021] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A tubular membrane sealing structure based on inner membrane dehydration, comprising a tube end (4), a pressure plate (1), a locking fastener (3), a membrane tube (6), a cylinder (5), and a sealing ring (2), characterized in that: The membrane tube (6) is fitted inside the cavity of the cylinder (5). The right end of the tube end (4) is fixedly connected to the cylinder (5). The left end of the tube end (4) abuts against the right end of the pressure plate (1). The tube end (4) has a through hole. An annular groove (21) is also provided outside the through hole located at the abutment of the tube end (4) and the pressure plate (1). A sealing ring (2) is provided in the annular groove (21). The membrane tube (6) is fitted inside the through hole. The sealing ring (2) is fitted outside the membrane tube (6). The locking fastener (3) is located on the outer surface of the tube end (4) and the pressure plate (1). The tube end (4) and the pressure plate (1) are pressed and abutted by the locking fastener (3).

2. The tubular membrane sealing structure based on inner membrane dehydration according to claim 1, characterized in that: The locking fastener (3) is a nut with internal threads; the outer surface of the pipe end (4) is provided with matching threads. By tightening the nut's internal threads with the threads on the outer surface of the pipe end (4), the pipe end (4) and the pressure plate (1) are tightly connected.

3. The tubular membrane sealing structure based on inner membrane dehydration according to claim 2, characterized in that: An annular groove (21) located on the outside of the through hole at the junction of the tube end (4) and the pressure plate (1) is connected to the through hole; the outer diameter of the left surface of the annular groove (21) is the same as the outer diameter of the right surface of the annular groove (21), and the inner diameter of the left surface of the annular groove (21) is the same as the inner diameter of the right surface of the annular groove (21).

4. The tubular membrane sealing structure based on inner membrane dehydration according to claim 3, characterized in that: The ratio of the groove depth of the annular groove (21) to the wire diameter of the sealing ring (2) is 2: (3-3.5); the ratio of the groove depth to the groove width of the annular groove (21) is (2-2.5):2.

5.

5. The tubular membrane sealing structure based on inner membrane dehydration according to claim 4, characterized in that: The ratio of the groove depth of the annular groove (21) to the wire diameter of the sealing ring (2) is 2:3.

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