Filter with replaceable membrane

Abstract

The utility model provides a replaceable membrane filter which comprises a filter shell, the filter shell comprises a filter upper shell and a filter lower shell, and the filter lower shell comprises a lower shell body part, a side wall part used for limiting sideslip of the filter upper shell and a step part used for supporting. After the filter upper shell and the filter lower shell are detachably and fixedly connected, a filtering cavity is formed in the filter upper shell and the filter lower shell, a filtering membrane, a porous supporting plate and a cross rib are arranged in the cavity, a sealing gasket is arranged between the membrane and the filter upper shell, one end of the filter upper shell is communicated with a liquid inlet device, and one end of the filter lower shell is communicated with a liquid outlet device. According to the replaceable membrane filter disclosed by the utility model, the filter shells are arranged to be an upper filter shell and a lower filter shell which are detachable, then the filter membranes are arranged in the shells, and the filter shells are detachably connected through the inlet and outlet pipelines connected with the filter shells, so that the function of replacing the membranes is realized; and after use, the device can be detached and cleaned.

Description

Technical Field

[0001] The utility model relates to the technical field of filtration, in particular to a replaceable membrane filter. Background Art

[0002] Filters are devices that remove contaminants from liquids or gases using pores in a membrane. They are widely used in the biopharmaceutical industry. Filters work by separating unwanted components from fluids (gases or liquids) through direct membrane interception, inertial impaction, or diffusion interception. This approach purifies the fluid, protects equipment, and improves product quality.

[0003] The existing technology uses small disc filters, capsule filters or filter elements to filter liquids and gases. The filter membrane cannot be replaced after use. The filter is disposable and the cost is high, especially in the early stage of small-scale experiments. Some feed liquids are relatively precious. The larger the membrane area, the more feed liquid volume is required. With the urgent demand of laboratories for efficient, flexible and economical filtration solutions, as well as the continuous improvement of technological progress and production standards, traditional fixed filters have gradually shown their limitations. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a replaceable membrane filter, aiming to solve the technical problems in the existing technology that the filter membrane in the filter cannot be replaced and cannot be reused.

[0005] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: a replaceable membrane filter comprises a filter housing, wherein the filter housing comprises an upper filter shell and a lower filter shell, the lower filter shell comprises a lower shell body portion, and a side wall portion for limiting the side sliding of the filter upper shell, the lower filter shell also comprises a step portion located between the lower shell body portion and the side wall portion for supporting and limiting the filter upper shell, the upper filter shell and the lower filter shell are detachably fixedly connected to form a filtering cavity inside, the cavity is provided with a membrane for filtering, and the cavity is also provided with a cross rib that abuts against the inside of the filter lower shell, a porous support plate is provided between the cross rib and the membrane, the porous support plate abuts against the cross rib, a sealing gasket is provided between the diaphragm and the upper filter shell, one end of the filter upper shell is connected to the liquid inlet device, and one end of the filter lower shell is connected to the liquid outlet device.

[0006] Compared with the prior art, the beneficial effect of the present invention is that the filter is divided into an upper filter shell and a lower filter shell, and the upper filter shell and the lower filter shell are made detachable, and then a filter membrane is installed in the cavity formed by the upper filter shell and the lower filter shell, so that the present invention can realize the function of detachable and replaceable membrane, realize multiple reuse, and reduce investment costs.

[0007] According to one aspect of the above technical solution, the step portion includes a first table surface, a second table surface, and a step wall connecting the first table surface and the second table surface.

[0008] According to one aspect of the above technical solution, the outer diameter of the filter upper shell and the outer diameter of the sealing gasket are the same as the inner diameter of the side wall portion, and the diameter of the diaphragm and the diameter of the porous support plate are the same as the inner diameter of the step wall.

[0009] According to one aspect of the above technical solution, the width of the sealing gasket is greater than the width of the second mesa.

[0010] According to one aspect of the above technical solution, the porous support plate is provided with filter holes in the middle, and the porous support plate is made of rigid material.

[0011] According to one aspect of the above technical solution, the pore size of the porous support plate is larger than the pore size of the membrane.

[0012] According to one aspect of the above technical solution, the cavity includes an upper cavity formed by the upper shell of the filter, the sealing gasket and the diaphragm seal, and the cavity also includes a lower cavity formed by the lower shell of the filter and the porous support plate. The upper cavity and the lower cavity are connected through the filter holes between the diaphragm and the porous support plate.

[0013] According to one aspect of the above technical solution, the liquid inlet device includes a four-way quick connector detachably connected to one end of the filter upper shell, and a first quick-release connector detachably connected to the four-way connecting block at one end away from the filter upper shell. The liquid inlet device also includes a second quick connector and an exhaust valve core detachably connected to both sides of the four-way connecting block.

[0014] According to one aspect of the above technical solution, the liquid outlet device is a third quick-release connector.

[0015] According to one aspect of the above technical solution, the cross rib is cross-shaped, one side of the cross rib abuts against the filter lower shell and fits tightly against the inner wall of the filter lower shell, and the other side of the cross rib is on the same level as the first table surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a replaceable membrane filter in one embodiment of the present utility model;

[0017] Figure 2 This is a cross-sectional view of a replaceable membrane filter in one embodiment of the present utility model;

[0018] Explanation of the main component symbols: 1-filter housing, 11-filter upper shell, 12-filter lower shell, 121-lower shell body, 122-step portion, 123-side wall, 124-first table top, 125-step wall, 126-second table top, 2-cross ribs, 3-porous support plate, 4-diaphragm, 5-sealing gasket, 6-liquid inlet device, 61-four-way connecting block, 62-first mounting joint, 63-second quick-release joint, 64-exhaust valve core, 7-liquid outlet device, 71-third quick-release joint;

[0019] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0020] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The drawings illustrate several embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] See also Figure 1, an embodiment of the present invention provides a replaceable membrane filter, including a filter housing 1, the filter housing 1 includes a filter upper shell 11 and a filter upper shell 12, the filter upper shell 12 includes a lower shell body 121, and a side wall portion 123 for limiting the side sliding of the filter upper shell 11, the filter upper shell 12 also includes a step portion 122 located between the lower shell body 121 and the side wall portion 123 for supporting and limiting the position of the filter upper shell 11, the filter upper shell 11 and the filter After the upper shell 12 of the filter is detachably fixedly connected, a filtering cavity is formed inside. A diaphragm 4 for filtering is provided inside the cavity. A cross rib 2 is also provided inside the cavity, which abuts against the upper shell 12 of the filter. A porous support plate 3 is provided between the cross rib 2 and the diaphragm 4. The porous support plate 3 abuts against the cross rib 2. A sealing gasket 5 is provided between the diaphragm 4 and the upper shell 11 of the filter. One end of the upper shell 11 of the filter is connected to the liquid inlet device 6, and one end of the upper shell 12 of the filter is connected to the liquid outlet device 7.

[0024] In this embodiment, if the step portion 122 of the filter upper shell 12 is set as a table, it is necessary to directly press the sealing gasket 5, the diaphragm 4 and the porous support plate 3 onto the table through the filter upper shell 11 for sealing and fixing. At this time, the sealing performance of the internal cavity depends entirely on the sealing gasket 5 being squeezed and sealed with the side wall portion 123 after the filter upper shell 11 is squeezed downward and deformed. This has high requirements for the sealing gasket 5. Due to the small contact area of ​​the seal, leakage is prone to occur under high-pressure filtering conditions. In addition, this design will cause certain squeezing deformation of the diaphragm 4 and the porous support plate 3 when the connection pressure is too large. For this reason, the step portion 122 of the filter upper shell 12 is set to a structure with two tables. Preferably, the step portion 122 includes a first table 124 and a second table 126, and a step wall 125 connected to the first table 124 and the second table 126. Please refer to Figure 2During the assembly process, first place the cross rib 2 into the lower cavity, ensuring that one end of the cross rib 2 is in contact with the filter upper shell 12 and the other end is level with the first table 124. Specifically, the cross rib 2 is in the shape of a cross, and one side of the cross rib 2 and the filter upper shell 12 are in close contact with the inner wall of the filter upper shell 12, and the other side of the cross rib 2 is in the same horizontal plane with the surface of the first table 124. Next, place the porous support plate 3 on the first table 124. It can be understood that the outer edge of one side of the porous support plate 3 is in contact with the first table 124, and the middle part uses the cross rib 2 as a support platform to rest against it. At this time, the height of the porous support plate 3 is slightly higher than the step wall 125. Next, place the diaphragm 4 on the porous support plate 3, and then place the sealing gasket 5 on the second table 126. Finally, cover the filter upper shell 11 on the filter upper shell 12, connect the filter upper shell 11 and the filter upper shell 12 with a clamp, and complete the assembly of the filter. It should be noted that the cross ribs 2 can also be set to other shapes. Its main function is to support the porous support plate 3 to prevent the porous support plate 3 from bending due to excessive liquid pressure inside the upper cavity during filtration, affecting the filtration effect. At the same time, the cross ribs 2 cannot block the filtered liquid from flowing out of the filter upper shell 12; in addition, the sealing gasket 5 is plastically deformed under the snap-fit ​​pressure of the filter upper cover, so that one side of the sealing gasket 5 is tightly fitted with the second table 126, and the other side is tightly fitted with the filter upper shell 11, so that the connection between the filter upper shell 11 and the filter upper shell 12 has good sealing performance, which can be suitable for use under conditions of relatively high hydraulic pressure, and has a simple structure and is easy to assemble and disassemble.

[0025] In this embodiment, in order to prevent the diaphragm 4 and the porous support plate 3 from shaking inside, the side of the filter upper shell 11 that fits with the sealing gasket 5 is greater than or equal to the width of the sealing gasket 5, and the width of the sealing gasket 5 is not greater than the width of the second table 126. Therefore, after the filter upper shell 11 and the filter upper shell 12 are connected, it not only ensures that the sealing function of the connection between the filter upper shell 11 and the filter upper shell 12 is good, but also utilizes the part of the sealing gasket 5 that exceeds the second table 126 to squeeze and limit the up and down movement of the diaphragm 4 and the porous support plate 3, so that the liquid cannot flow through the edges of the diaphragm 4 and the porous support plate 3 during the filtration process, and the filtration effect is better. Specifically, the cavity includes the upper cavity formed by the filter upper shell 11, the sealing gasket 5 and the diaphragm 4, and the cavity also includes the lower cavity formed by the filter lower shell 12 and the porous support plate 3. The upper cavity and the lower cavity are connected through the filter holes between the diaphragm 4 and the porous support plate 3. In addition, the diameters of the diaphragm 4 and the porous support plate 3 are set to be the same as the diameter enclosed by the step wall 125, which can prevent shaking in the horizontal direction. At the same time, the same diameter makes installation more convenient. Specifically, the outer diameter of the filter upper shell 11 and the outer diameter of the sealing gasket 5 are the same as the inner diameter of the side wall portion 123, the diameter of the diaphragm 4 and the diameter of the porous support plate 3 are the same as the inner diameter of the step wall 125, and the width of the sealing gasket 5 is greater than the width of the second table 126.

[0026] During the filtration process, due to the high hydraulic pressure in the filter housing, the pore size of the porous support plate 3 located below the diaphragm 4 cannot be significantly larger than the pore size of the diaphragm 4. Otherwise, under the pressure of the liquid, the pore size difference will crush the diaphragm 4, causing the diaphragm 4 to lose its filtering function. At the same time, the porous support plate 3 must not deform easily under the high hydraulic pressure to protect the diaphragm 4 from deformation. Specifically, the porous support plate 3 has a filter hole in the middle, is made of a rigid material, and has a pore size larger than that of the diaphragm 4.

[0027] During the filtration test, after completing the installation of the filter housing 1 as described above, the four-way connecting block 61 is first connected to the filter upper housing 11, and then the first quick-release connector 62, the second quick-release connector 63, and the exhaust valve core 64 are installed. The third quick-release connector 71 is then connected to the filter lower housing 13, thereby completing the connection between the filter inlet device 6 and the liquid outlet device 6. Specifically, the liquid inlet device 6 includes the four-way connecting block 61, which is detachably connected to one end of the filter upper housing 11, and the first quick-release connector 62, which is detachably connected to the end of the four-way connecting block 61 away from the filter upper housing 11. The liquid inlet device 6 also includes the second quick-release connector 63 and the exhaust valve core 64, which are detachably connected to both sides of the four-way connecting block 61. The liquid outlet device 6 includes the third quick-release connector 71. After assembling the entire filtration device, the purified water or liquid is then loaded into the pressure storage tank. The inlet of the pressure storage tank is connected to the gas source, and the outlet is connected to the first quick-release connector 62 of the filter. The second quick-release connector 63 of the filter is connected to the pressure differential transmitter. After the connection is completed, adjust the pressure regulating valve. When the pressure is low, open the exhaust valve core 64 first to empty the air at the upstream end of the filter. After the exhaust is completed, close the exhaust valve core 64 and adjust the pressure regulating valve to the experimental test pressure. The filtration test experiment is ready.

[0028] In summary, the replaceable membrane filter in the above-mentioned embodiment of the present invention has a fixedly installed diaphragm in the cavity formed after the upper filter shell and the lower filter shell are connected, as well as cross ribs, a porous support plate and a sealing gasket for supporting the fixed diaphragm, and then the upper filter shell and the lower filter shell are fixedly connected by a clamp, and a detachable liquid inlet device and a liquid outlet device are installed on one side of the upper filter shell and the lower filter shell, so that the present invention has the functional characteristics of detachable and replaceable diaphragm. Because the liquid inlet device and the liquid outlet device are detachable, the present invention can be disassembled and thoroughly cleaned after use, and the replacement diaphragm can be repeatedly used to reduce investment costs.

[0029] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0030] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A replaceable membrane filter, characterized in that: The filter housing comprises a filter housing, wherein the filter housing comprises an upper filter shell and a lower filter shell, the lower filter shell comprises a lower shell body portion, and a side wall portion for limiting the side sliding of the upper filter shell, the lower filter shell also comprises a step portion located between the lower shell body portion and the side wall portion for supporting and limiting the upper filter shell, the upper filter shell and the lower filter shell are detachably fixedly connected to form a filtering cavity inside, a diaphragm for filtering is provided inside the cavity, a cross rib is further provided inside the cavity that abuts against the lower filter shell, a porous support plate is provided between the cross rib and the diaphragm, the porous support plate abuts against the cross rib, a sealing gasket is provided between the diaphragm and the upper filter shell, one end of the upper filter shell is connected to a liquid inlet device, and one end of the lower filter shell is connected to a liquid outlet device.

2. The replaceable membrane filter according to claim 1, characterized in that: The step portion includes a first table surface, a second table surface, and a step wall connecting the first table surface and the second table surface.

3. The replaceable membrane filter according to claim 2, characterized in that: The outer diameter of the filter upper shell and the outer diameter of the sealing gasket are both the same as the inner diameter of the side wall portion, and the diameter of the diaphragm and the diameter of the porous support plate are the same as the inner diameter of the step wall.

4. The replaceable membrane filter according to claim 2, characterized in that: The width of the sealing gasket is greater than the width of the second mesa.

5. The replaceable membrane filter according to claim 1, characterized in that: The porous support plate is provided with filter holes in the middle, and the porous support plate is made of rigid material.

6. The replaceable membrane filter according to claim 1, characterized in that: The pore size of the porous support plate is larger than the pore size of the membrane.

7. The replaceable membrane filter according to claim 1, characterized in that: The cavity includes an upper cavity formed by the filter upper shell, the sealing gasket and the diaphragm, and the cavity also includes a lower cavity formed by the filter lower shell and the porous support plate. The upper cavity and the lower cavity are connected through the filter holes between the diaphragm and the porous support plate.

8. The replaceable membrane filter according to claim 1, characterized in that: The liquid inlet device includes a four-way quick connector detachably connected to one end of the filter upper shell, and a first quick-release connector detachably connected to an end of the four-way connecting block away from the filter upper shell. The liquid inlet device also includes a second quick connector and an exhaust valve core detachably connected to both sides of the four-way connecting block.

9. The replaceable membrane filter according to claim 1, characterized in that: The liquid outlet device is a third quick-release connector.

10. The replaceable membrane filter according to claim 2, characterized in that: The cross rib is in a cross shape, one side of the cross rib abuts against the filter lower shell and is tightly fitted with the inner wall of the filter lower shell, and the other side of the cross rib is in the same horizontal plane as the first table surface.

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