Sewage filter

Abstract

The utility model discloses a sewage filter which comprises an upper box body, an exhaust valve, a filter assembly and an air pressure back-flushing mechanism, a box cover is arranged at the top of the upper box body, the exhaust valve is arranged on the box cover, a sewage inlet is formed in the side wall of the upper box body, and a sewage outlet is formed in the bottom of the upper box body; the number of the filter assemblies is two or more, each filter assembly comprises a plurality of filter plates arranged in the upper box body and a drain pipe arranged in the upper box body, cavities are formed in the filter plates, each cavity is communicated with the drain pipe through a branch pipe, the drain pipe extends out of the upper box body, and the air pressure backflushing mechanism is communicated with the drain pipe and used for blowing compressed air into the filter plates. According to the sewage filter provided by the utility model, sewage is continuously pumped in to form a water pressure difference, and slurry with higher concentration can be obtained after clear water is filtered out, so that the water-sewage separation time is effectively shortened.

Description

Technical Field

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

[0002] In cutting and edge grinding processing factories, such as processing stone, artificial quartz stone, glass, and ceramics, a large amount of muddy sewage will be produced during the production process. The suspended matter in the sewage is mainly solid particles of particle size. Direct discharge of sewage will not only pollute the environment, but also consume an alarming amount of water. Therefore, sewage needs to be recycled for industrial wastewater utilization, and the clean water after solid-liquid separation can be used as circulating water to reduce water consumption.

[0003] In the existing sewage treatment system, sewage is first pumped into a sewage tower for sedimentation before solid-liquid separation to achieve water-waste stratification. Clean water is located in the upper layer and can be used as circulating water; the bottom mud is discharged to the filter press. In order to allow the particles to settle downward, PAM and PAC are generally added to form larger particles. However, the use of sewage towers requires the timely and quantitative addition of chemicals into the tower to ensure the flocculation effect, and the sewage takes a long time to stand.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Utility Model Content

[0005] In view of the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a sewage filter, aiming to solve the technical problems that sewage takes a long time to stand and requires regular quantitative addition of chemicals.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A sewage filter comprises an upper box body, an exhaust valve, a filter assembly, and an air pressure recoil mechanism, wherein a box cover is arranged on the top of the upper box body, the exhaust valve is arranged on the box cover, a sewage inlet is arranged on the side wall of the upper box body, and a sewage outlet is arranged on the bottom of the upper box body; the filter assembly comprises more than two groups, each group of the filter assembly comprises a plurality of filter plates arranged in the upper box body, and a drainage pipe arranged in the upper box body, a cavity is arranged in the filter plate, each cavity is connected with the drainage pipe through a branch pipe, the drainage pipe extends outside the upper box body, and the air pressure recoil mechanism is connected with the drainage pipe for blowing compressed gas into the filter plate.

[0008] Furthermore, the filter plate is a ceramic filter plate or a microporous resin filter plate.

[0009] Furthermore, the filter plate is arranged vertically, an L-shaped frame is arranged inside the upper box body, and a waist hole for fixing the filter plate is arranged on one side of the L-shaped frame.

[0010] Furthermore, the air pressure recoil mechanism includes a three-way valve connected to the end of the drain pipe and an air pipe connected to one interface of the three-way valve, the other joint of the three-way valve is connected to the water outlet pipe, and the air pipe is used to connect to an external compressed gas source.

[0011] Furthermore, the sewage inlet is located at the upper part of the side wall of the upper box body.

[0012] Furthermore, the upper box body is a cylindrical structure or a rectangular structure.

[0013] Furthermore, a lower box body with a cone structure is provided at the bottom of the upper box body, and the sewage outlet is located at the bottom of the lower box body.

[0014] Furthermore, a water reflection cone is provided in the lower box body.

[0015] Beneficial effects: The sewage filter provided by the utility model continuously pumps sewage into the upper box body, and utilizes the water pressure difference to discharge clean water out of the upper box body through the filter plate, so that a high-concentration mud is formed at the bottom of the lower box body. The discharged clean water can be used as circulating water, and the mud is discharged to the filter press; during filtering, particles adhere to the surface of the filter plate, and the air pressure recoil mechanism regularly fills compressed gas into the drain pipe to clean the particles on the surface of the filter plate to ensure smooth filtered water. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of the sewage filter provided by the utility model.

[0017] Figure 2 The utility model is a side sectional view of the sewage filter provided by the utility model.

[0018] Figure 3 This is a structural diagram of the filter assembly in the sewage filter provided by the utility model.

[0019] Figure 4 This is an exploded view of the filter assembly in the sewage filter provided by the utility model.

[0020] Main component symbols: upper box 1, sewage inlet 11, sewage outlet 12, exhaust valve 2,

[0021] Filter assembly 3, filter plate 31, drain pipe 32, branch pipe 33, L-shaped frame 34, waist hole 341, notch 342, air pressure recoil mechanism 4, three-way valve 41, air pipe 42, box cover 5, water outlet pipe 6, lower box body 7, and water return cone 8. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-4 The utility model provides a sewage filter, including an upper box body 1, an exhaust valve 2, a filter assembly 3, and an air pressure recoil mechanism 4, wherein a box cover 5 is provided on the top of the upper box body 1, the exhaust valve 2 is provided on the box cover 5, a sewage inlet 11 is provided on the side wall of the upper box body 1, and a sewage outlet 12 is provided at the bottom of the upper box body 1; the filter assembly 3 is more than two groups, each group of the filter assembly 3 includes a plurality of filter plates 31 arranged in the upper box body 1, and a drainage pipe 32 arranged in the upper box body 1, a cavity is provided in the filter plate 31, each cavity is connected with the drainage pipe 32 through a branch pipe 33, and the drainage pipe 32 extends to the outside of the upper box body 1, and the air pressure recoil mechanism 4 is connected with the drainage pipe 32, and is used to blow compressed gas into the filter plate 31.

[0024] The box cover 5 is sealed with the upper box body 1 to form a closed space. During operation, sewage is continuously pumped into the upper box body 1 from the sewage inlet 11, and a positive pressure state is formed in the upper box body 1. Under the action of the filter plate 31, the particles in the sewage cannot pass through the filter plate 31, and are attached to the surface of the filter plate 31, and the particles accumulate and agglomerate; while the clean water enters the cavity through the filter plate 31, and the clean water is collected in the drain pipe 32 for discharge. The air pressure recoil mechanism 4 regularly blows compressed gas into the drain pipe 32, and the compressed gas flows to the cavity through the drain pipe 32 and the branch pipe 33. When the compressed gas passes through the filter plate 31 and enters the upper box body 1, the particles attached to the filter plate 31 are blown off, and the larger particles fall to the sewage outlet 12 due to their own weight. After filtering out part of the clean water, a higher concentration of mud can be directly obtained. Compared with the prior art, there is no need to add agents to promote the precipitation of particulate matter, and the pressure difference can be used to filter out the clean water to increase the mud concentration, and the water-waste separation time can be shortened.

[0025] In this embodiment, refer to Figure 3 The filter components 3 are divided into two groups. When one group of filter components 3 is in the water filtering state, the air pressure recoil mechanism 4 blows compressed air into the other group of filter components 3. The working states of the two groups of filter components 3 are alternately cycled in sequence, so that the compressed air can blow off the particles attached to the surface of the filter plate 31 in time, so as to achieve the purpose of cleaning the surface of the filter plate 31 and ensure smooth filtered water.

[0026] More groups of filter components 3 can be set according to the size of the upper box body 1 or the filtering requirements. Similarly, when the air pressure recoil mechanism 4 blows compressed air into one group of filter components 3, the filter components 3 of the remaining groups are in a water filtering state, and the air pressure recoil mechanism 4 blows compressed gas into each group of filter components 3 in turn.

[0027] In a preferred embodiment, the filter plate 31 is a ceramic filter plate or a microporous resin filter plate. The ceramic filter plate has high mechanical strength and corrosion resistance. The ceramic filter plate is a porous material that allows water to pass through the filter plate 31, thereby completing the filtering task. The microporous resin filter plate has good chemical stability and high temperature resistance. The microporous resin filter plate uses controllable elastic holes, which can improve the filtration flux and increase the filtration capacity. In addition, the filter plate 31 can also be a cloth filter plate, which uses the pores on the fabric to achieve filtration, but because the pores of the fabric are larger than those of the ceramic filter plate and the microporous resin filter plate, the filtering effect is relatively poor, and the service life is relatively short.

[0028] In a preferred embodiment, see Figure 2 , 4 , the filter plate 31 is arranged vertically to facilitate the particles to fall down due to their own weight. An L-shaped frame 34 is arranged on the inner side of the upper box body 1, and a waist hole 341 for fixing the filter plate 31 is arranged on one side of the L-shaped frame 34. Specifically, a pipe opening communicating with the cavity is arranged at the bottom of the filter plate 31, and the pipe opening is connected to the water outlet pipe 6 through the branch pipe 33. A notch 342 for avoiding the pipe opening is arranged on the L-shaped frame 34. When installing the filter plate 31, the bottom of the filter plate 31 is placed on one inner side of the L-shaped frame 34, and is fixedly connected to the waist hole 341 on the other side by screws to improve the stability of the installation of the filter plate 31.

[0029] In a preferred embodiment, see Figure 3 The air pressure recoil mechanism 4 includes a three-way valve 41 connected to the end of the drain pipe 32 and an air pipe 42 connected to one interface of the three-way valve 41. The other joint of the three-way valve 41 is connected to the water outlet pipe 6. The air pipe 42 is used to connect to an external compressed gas source, wherein the external compressed gas source can be an air compressor. The three-way valve 41 is a two-position three-way solenoid valve. When the filter assembly 3 is in the water filtering state, the drain pipe 32 is connected to the water outlet pipe 6, the air pipe 42 is closed, and the water outlet pipe 6 discharges clean water; when the filter assembly 3 is in the cleaning state, the air pipe 42 is connected to the drain pipe 32, the water outlet pipe 6 is closed, and the compressed gas enters the drain pipe 32 through the air pipe 42. Since the compressed gas can pass through the filter plate 31 and enter the upper box body 1, the air in the upper box body 1 increases, and the gas can be discharged in time by setting the exhaust valve 2.

[0030] In a preferred embodiment, see Figure 2The sewage inlet 11 is located at the upper part of the side wall of the upper box body 1, so that sewage enters from a high place and flows downward, ensuring that sewage with low concentration can pass through the entire filter plate 31 to improve the water filtering efficiency. Preferably, the sewage inlet 11 is located on the side of the upper box body 1 away from the outlet pipe 6 to increase the distance between the sewage inlet 11 and the outlet pipe 6.

[0031] In a preferred embodiment, the upper box body 1 is a cylindrical structure or a rectangular structure, and can be set to different shapes according to actual filtering requirements.

[0032] In a preferred embodiment, see Figure 2 The bottom of the upper box body 1 is provided with a lower box body 7 of a cone structure, and the sewage outlet 12 is located at the bottom of the lower box body 7. Through the above arrangement, the mud with higher concentration can be accumulated downward and the accumulated mud can be discharged completely.

[0033] Further, see Figure 2 A water deflection cone 8 is provided in the lower box body 7, and the surface of the water deflection cone 8 is inclined downward to prevent the water flow from turning over the mud at the bottom.

[0034] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and the utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the utility model.

Claims

1. A sewage filter, characterized in that: It includes an upper box body, an exhaust valve, a filter assembly, and an air pressure recoil mechanism. The top of the upper box body is provided with a box cover, the exhaust valve is arranged on the box cover, the side wall of the upper box body is provided with a sewage inlet, and the bottom of the upper box body is provided with a sewage outlet; the filter assembly is divided into two or more groups, each group of filter assemblies includes a plurality of filter plates arranged in the upper box body, and a drainage pipe arranged in the upper box body, a cavity is arranged in the filter plate, each cavity is connected with the drainage pipe through a branch pipe, and the drainage pipe extends outside the upper box body, and the air pressure recoil mechanism is connected with the drainage pipe to blow the compressed gas into the filter plate.

2. The sewage filter according to claim 1, characterized in that: The filter plate is a ceramic filter plate or a microporous resin filter plate.

3. The sewage filter according to claim 1, characterized in that: The filter plate is arranged vertically, an L-shaped frame is arranged inside the upper box body, and a waist hole for fixing the filter plate is arranged on one side of the L-shaped frame.

4. The sewage filter according to claim 1, characterized in that: The air pressure recoil mechanism comprises a three-way valve connected to the end of the drain pipe and an air pipe connected to one interface of the three-way valve, the other joint of the three-way valve is connected to the water outlet pipe, and the air pipe is used to connect to an external compressed gas source.

5. The sewage filter according to claim 1, characterized in that: The sewage inlet is located at the upper part of the side wall of the upper box body.

6. The sewage filter according to claim 1, characterized in that: The upper box body is a cylindrical structure or a rectangular structure.

7. The sewage filter according to claim 1, characterized in that: A lower box body with a cone structure is arranged at the bottom of the upper box body, and the sewage outlet is located at the bottom of the lower box body.

8. The sewage filter according to claim 7, characterized in that: A water-repelling cone is arranged in the lower box body.

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