Membrane filter

Abstract

The utility model relates to the field of filtering equipment, and discloses a filter membrane filter which comprises a shell and a filtering plate, the shell is divided into a first cavity for accommodating a solid-liquid mixture and a second cavity for storing liquid by the filter plate; the first cavity is provided with an air inlet pipe; the second cavity is provided with an exhaust pipe; the upper surface of the filter plate is covered with a filter membrane; under the combined action of the positive pressure of the first cavity and the negative pressure of the second cavity, liquid in the solid-liquid mixture penetrates through the filter membrane and the filter plate and enters the second cavity, and solid-liquid separation is achieved. The filter membrane filter can improve the filtering efficiency and is convenient to disassemble and assemble.

Description

Technical Field

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

[0002] At present, there are two commonly used filters in chemical production. One is a positive pressure filter, which can adjust the pressure to change the driving force of filtration, enabling the liquid to pass through the filter membrane to achieve solid-liquid separation. However, due to the relatively high pressure, the filter membrane is prone to rupture. The other is a suction filtration filter, with a limit pressure of one atmospheric pressure, which will not cause the filter membrane to rupture, but the filtration efficiency is relatively slow.

[0003] CN202122343199 discloses a solution suction filtration device, including an upper cup body and a lower cup body. The upper cup body is a cylindrical structure with openings at both the top and bottom, and an internal thread is provided on the inner circle of the lower opening of the upper cup body; the lower cup body is a funnel-shaped structure, and an external thread is provided on the outer circle of the upper opening of the lower cup body; the upper cup body and the lower cup body are detachably installed through the internal thread and the external thread; a replaceable filter membrane is also provided at the upper opening of the lower cup body, and an air extraction pipe communicating with the inside of the lower cup body is provided on the side wall of the lower cup body. This suction filtration device filters through the method of negative pressure suction filtration. However, since the upper cup body is connected to the outside, the limit pressure of negative pressure suction filtration is one atmospheric pressure, and it cannot well meet the production demand when the production volume is relatively large.

[0004] The technical problem to be solved by the utility model is: how to improve the filtration efficiency of the filter membrane filter. Summary of the Utility Model

[0005] The main purpose of the utility model is to provide a filter membrane filter. By introducing gas into the first cavity and evacuating the second cavity, when performing suction filtration on the solid-liquid mixture, suction filtration can be carried out under a pressure greater than one atmospheric pressure, thereby improving the filtration efficiency.

[0006] To achieve the above purpose, the technical solution adopted in this application is:

[0007] A filter membrane filter includes a housing and a filter plate; the filter plate divides the housing into a first cavity for accommodating the solid-liquid mixture and a second cavity for storing the liquid; an air inlet pipe is provided in the first cavity; an air extraction pipe is provided in the second cavity; a filter membrane covers the upper surface of the filter plate;

[0008] Under the combined action of the positive pressure in the first cavity and the negative pressure in the second cavity, the liquid in the solid-liquid mixture passes through the filter membrane and the filter plate and enters the second cavity, realizing solid-liquid separation.

[0009] Preferably, the housing is divided into an upper housing and a lower housing; the upper housing, the filter plate, and the lower housing are connected in sequence from top to bottom; the first cavity is arranged in the upper housing; the second cavity is arranged in the lower housing.

[0010] Preferably, the top of the upper housing is a detachable cover plate; the intake pipe is arranged on the cover plate.

[0011] Preferably, the cover plate is provided with a handle.

[0012] Preferably, the bottom of the upper housing is provided with a first limiting groove; the top of the filter plate is provided with a first limiting boss; the first limiting groove and the first limiting boss cooperate to prevent offset between the upper housing and the filter plate; the top of the lower housing is provided with a second limiting boss; the bottom of the filter plate is provided with a second limiting groove; the second limiting groove and the second limiting boss cooperate to prevent offset between the lower housing and the filter plate.

[0013] Preferably, first sealing rings are embedded on both sides of the first limiting boss; second sealing rings are embedded on both sides of the second limiting boss.

[0014] Preferably, the upper housing is sleeved with a first flange; the lower housing is sleeved with a second flange; the first flange and the second flange cooperate to connect the upper housing, the filter plate and the lower housing together.

[0015] Preferably, the lower housing is provided with a liquid level gauge for detecting the liquid level height; the bottom of the lower housing is provided with a liquid outlet pipe arranged obliquely downward; the liquid outlet pipe is provided with a valve.

[0016] Preferably, a pressure relief valve is arranged on the air extraction pipe.

[0017] Preferably, the housing is a housing made of PP material; the filter plate is a filter plate made of PP material.

[0018] Compared with the prior art, the present solution has the following beneficial effects:

[0019] In this case, the filter membrane filter passes gas into the first cavity to make the air pressure in the first cavity greater than one atmospheric pressure, and then evacuates the second cavity to form a negative pressure in the second cavity, so that the pressure during the suction filtration of the solid-liquid mixture can be greater than one atmospheric pressure, improving the filtration efficiency of the filter membrane filter. Moreover, the filter membrane filter in this case can also avoid the situation that the air pressure in the first cavity gradually decreases after the solid-liquid mixture is gradually filtered, resulting in a decrease in filtration efficiency.

[0020] Secondly, the filter membrane is placed on the filter plate, and the filter plate is provided with filter holes, improving the bearing capacity of the filter membrane and ensuring that the filter membrane will not rupture while increasing the positive pressure, ensuring the filtration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the filter membrane filter of Embodiment 1;

[0022] Figure 2 Front view of the filter membrane filter of Example 1;

[0023] Figure 3 Of Example 1 Figure 2 A-A cross-sectional view of;

[0024] Figure 4 Of Example 1 Figure 3 Enlarged view of B in.

[0025] Wherein, the upper shell 1; the first cavity 11; the air inlet pipe 12; the cover plate 13; the handle 131; the first limit groove 14; the first flange 15; the filter plate 2; the filter holes 21; the filter membrane 22; the first limit boss 23; the second limit groove 24; the first sealing ring 25; the lower shell 3; the second cavity 31; the air extraction pipe 32; the pressure relief valve 321; the second limit boss 33; the second sealing ring 34; the second flange 35; the liquid level gauge 36; the liquid outlet pipe 37; the valve 371. Detailed implementation manners

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the present application implemented described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0027] Example 1

[0028] Refer to Figures 1-4 , a filter membrane filter, including a shell and a filter plate 2; the filter plate 2 divides the shell into a first cavity 11 for accommodating a solid-liquid mixture and a second cavity 31 for storing liquid; the first cavity 11 is provided with an air inlet pipe 12; the second cavity 31 is provided with an air extraction pipe 32; the upper surface of the filter plate 2 is covered with a filter membrane 22;

[0029] Under the combined action of the positive pressure in the first cavity 11 and the negative pressure in the second cavity 31, the liquid in the solid-liquid mixture passes through the filter membrane 22 and the filter plate 2 and enters the second cavity 31, realizing solid-liquid separation.

[0030] In this embodiment, the intake pipe 12 is connected to an external air pump; the extraction pipe 32 is connected to an external vacuum device. The filter plate 2 is provided with filter holes 21; the filter membrane 22 is a polytetrafluoroethylene (PTFE) filter membrane 22. The specific working process of the filter membrane 22 filter is as follows: The staff places the solid-liquid mixture in the first cavity 11, starts the external air pump, and introduces air into the first cavity 11 to increase the air pressure in the first cavity 11. At the same time, the external vacuum device is started to extract the air in the second cavity 31 to form a vacuum in the second cavity 31. The liquid (filtrate) in the solid-liquid mixture in the first cavity 11 is subjected to the positive pressure of the first cavity 11 and the negative pressure of the second cavity 31, and sequentially passes through the filter membrane 22 and the filter plate 2 to enter the second cavity 31, while the solid (filter residue) remains on the filter membrane 22, thereby achieving solid-liquid separation.

[0031] Preferably, the housing is divided into an upper housing 1 and a lower housing 3; the upper housing 1, the filter plate 2, and the lower housing 3 are connected in sequence from top to bottom; the first cavity 11 is arranged in the upper housing 1; the second cavity 31 is arranged in the lower housing 3.

[0032] In this embodiment, the filter membrane 22 filter is composed of an upper housing 1, a filter plate 2, and a lower housing 3 that are connected in sequence from top to bottom, which is convenient for collecting the filtrate and the filter residue respectively after the solid-liquid separation is completed, and is also convenient for cleaning the inside of the filter membrane 22 filter. Secondly, the filter membrane 22 covers the filter plate 2, and the filter plate 2 is provided with filter holes 21. The filter plate 2 has a supporting effect on the filter membrane 22 to prevent the filter membrane 22 from being damaged due to excessive pressure. The filtrate filtered by the filter membrane 22 can flow into the second cavity 31 through the filter holes 21.

[0033] Preferably, the top of the upper housing 1 is a detachable cover plate 13; the intake pipe 12 is arranged on the cover plate 13.

[0034] In this embodiment, the top of the upper housing 1 and the cover plate 13 are detachably connected by threaded connection. The staff can rotate the cover plate 13 to open the top of the upper housing 1 and pour the solid-liquid mixture into the first cavity 11 from the top of the upper housing 1, avoiding the situation that part of the solid-liquid mixture remains in the pipeline when transporting the solid-liquid mixture through the pipeline. The intake pipe 12 is arranged on the cover plate 13 to prevent the solid-liquid mixture in the first cavity 11 from entering the intake pipe 12.

[0035] Preferably, the cover plate 13 is provided with a handle 131. It is convenient for the staff to open the cover plate 13.

[0036] Preferably, a first limiting groove 14 is provided at the bottom of the upper shell 1; a first limiting boss 23 is provided at the top of the filter plate 2; the first limiting groove 14 and the first limiting boss 23 cooperate to prevent offset between the upper shell 1 and the filter plate 2; a second limiting boss 33 is provided at the top of the lower shell 3; a second limiting groove 24 is provided at the bottom of the filter plate 2; the second limiting groove 24 and the second limiting boss 33 cooperate to prevent offset between the lower shell 3 and the filter plate 2.

[0037] In this embodiment, the upper shell 1, the filter plate 2, and the lower shell 3 are detachably connected together. A second limiting boss 33 is provided on the lower shell 3, and a second limiting groove 24 is provided on the filter plate 2. The staff only needs to place the second limiting groove 24 on the second limiting boss 33. That is, similarly, the upper shell 1 is provided with a first limiting groove 14, and the filter plate 2 is provided with a first limiting boss 23. The staff only needs to place the first limiting groove 14 on the second limiting boss 33. In this way, it is ensured that the upper shell 1, the filter plate 2, and the lower shell 3 are coaxially arranged, and there will be no gap due to the filter plate 2 and the lower shell 3 not being on the same axis, which affects the seal. Moreover, it is convenient for the staff to install the upper shell 1, the filter plate 2, and the lower shell 3, reducing the labor intensity of the staff.

[0038] Preferably, first sealing rings 25 are embedded on both sides of the first limiting boss 23; second sealing rings 34 are embedded on both sides of the second limiting boss 33.

[0039] In this embodiment, first sealing rings 25 are embedded on both sides of the first limiting boss 23, and second sealing rings 34 are embedded on both sides of the second limiting boss 33. In this way, after the upper shell 1, the filter plate 2, and the lower shell 3 are installed together, the first sealing rings 25 and the second sealing rings 34 seal the upper shell 1, the filter plate 2, and the lower shell 3 to prevent filtrate leakage. Secondly, through this sealing method, in addition to being used for positioning, the first limiting boss 23 and the second limiting boss 33 can also achieve simple sealing. Together with the two first sealing rings 25 and the two second sealing rings 34, filtrate leakage is further avoided.

[0040] Preferably, a first flange 15 is sleeved on the upper shell 1; a second flange 35 is sleeved on the lower shell 3; the first flange 15 and the second flange 35 cooperate to connect the upper shell 1, the filter plate 2, and the lower shell 3 together.

[0041] In this embodiment, both the first flange 15 and the second flange 35 are loose flanges, and the first flange 15 and the second flange 35 are connected by bolts, so that the upper shell 1, the filter plate 2, and the lower shell 3 are pressed and connected together. In this way, it is convenient to take out the filter residue and clean the upper shell 1, the filter plate 2, and the lower shell 3 after filtration, reducing the labor intensity of the staff.

[0042] Preferably, the lower housing 3 is provided with a liquid level gauge 36 for detecting the liquid level height; the bottom of the lower housing 3 is provided with a liquid outlet pipe 37 arranged obliquely downward; the liquid outlet pipe 37 is provided with a valve 371.

[0043] In this embodiment, the liquid level gauge 36 communicates with the lower housing 3. During the filtration process, the staff can observe the height of the filtrate in the second cavity 31 through the liquid level gauge 36, and then control the liquid outlet speed of the liquid outlet pipe 37 by adjusting the valve 371 to avoid damage to the filter due to too high a liquid level. The liquid outlet pipe 37 is arranged obliquely downward on the lower housing 3, and the angle between the liquid outlet pipe 37 and the horizontal plane is 45°, and other angles can also be set according to actual needs. By arranging the liquid outlet pipe 37 obliquely downward, the flow speed of the filtrate in the liquid outlet pipe 37 can be slowed down, preventing the filtrate from splashing, and moreover, it is convenient to connect with the externally provided collection equipment, reducing the labor intensity of the staff.

[0044] Preferably, the air extraction pipe 32 is provided with a pressure relief valve 321.

[0045] In this embodiment, the pressure relief valve 321 is a ball valve. After the filtration is completed, the externally provided vacuum extraction equipment stops working, and then the pressure relief valve 321 is opened to discharge the gas that enters the second cavity 31 from the first cavity 11, so that the first cavity 11 and the second cavity 31 are in an atmospheric pressure state, which is convenient for the staff to disassemble the upper housing 1, the lower housing 3 and the filter plate 2.

[0046] Preferably, the housing is a housing made of PP material; the filter plate 2 is a filter plate 2 made of PP material.

[0047] In this embodiment, the materials of the housing and the filter plate 2 are both PP. The PP plastic material can resist strong acids and alkalis, and has good toughness and plasticity, which can meet the solid-liquid separation of different solid-liquid mixtures.

[0048] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A membrane filter, characterized in that, It includes a housing and a filter plate; the filter plate divides the housing into a first cavity for accommodating a solid-liquid mixture and a second cavity for storing liquid; the first cavity is provided with an air inlet pipe; the second cavity is provided with an air extraction pipe; the upper surface of the filter plate is covered with a filter membrane; Under the combined action of the positive pressure in the first cavity and the negative pressure in the second cavity, the liquid in the solid-liquid mixture passes through the filter membrane and the filter plate and enters the second cavity, realizing solid-liquid separation.

2. The membrane filter according to claim 1, characterized in that, The housing is divided into an upper housing and a lower housing; the upper housing, the filter plate, and the lower housing are connected in sequence from top to bottom; the first cavity is arranged in the upper housing; the second cavity is arranged in the lower housing.

3. The membrane filter according to claim 2, characterized in that, The top of the upper housing is a detachable cover plate; the air inlet pipe is arranged on the cover plate.

4. The membrane filter according to claim 3, characterized in that, The cover plate is provided with a handle.

5. The membrane filter according to claim 2, characterized in that, The bottom of the upper housing is provided with a first limit groove; the top of the filter plate is provided with a first limit boss; the first limit groove and the first limit boss cooperate to prevent deviation between the upper housing and the filter plate; the top of the lower housing is provided with a second limit boss; the bottom of the filter plate is provided with a second limit groove; the second limit groove and the second limit boss cooperate to prevent deviation between the lower housing and the filter plate.

6. The membrane filter according to claim 5, characterized in that, Both sides of the first limit boss are embedded with a first sealing ring; both sides of the second limit boss are embedded with a second sealing ring.

7. The membrane filter according to claim 2, wherein The upper housing is sleeved with a first flange; the lower housing is sleeved with a second flange; the first flange and the second flange cooperate to connect the upper housing, the filter plate, and the lower housing together.

8. The membrane filter according to claim 2, characterized in that, The lower housing is provided with a liquid level gauge for detecting the liquid level height; the bottom of the lower housing is provided with a liquid outlet pipe arranged obliquely downward; the liquid outlet pipe is provided with a valve.

9. The membrane filter according to claim 1, wherein A pressure relief valve is arranged on the air extraction pipe.

10. The filter membrane filter according to claim 1, wherein, The housing is a housing made of PP material; the filter plate is a filter plate made of PP material.

Images