A filtering device with a hydrophobic cotton support membrane

Abstract

The present invention relates to the technical field of filtering devices, and discloses a filtering device with a hydrophobic cotton support membrane, including a body and a filter screwed on the body, the filter including: a container, a lower screw nozzle is arranged at the bottom; a bottom cover, an upper screw connection ring screwed with the lower screw nozzle is arranged at the top, and a lower screw connection ring screwed with the body is arranged at the bottom; a core piece is rotatably arranged inside the bottom cover, a through hole is opened on the core piece, and the top of the core piece is used to support the hydrophobic cotton. The invention can ensure that the filter membrane is squeezed and sealed while retaining the screw seal of the bottom cover, and can prevent the filter membrane from wrinkling to ensure the recovery rate of microorganisms. And by utilizing the gap between the hydrophobic cotton and the filter membrane, not only the guide hole generates suction on the hydrophobic cotton to make the hydrophobic cotton fit the support column more closely, but also produces an unexpected technical effect, making the removal of the filter membrane more convenient and safe.

Description

Technical Field

[0001] The invention relates to the technical field of filtering devices, and in particular to a filtering device with a hydrophobic cotton support membrane. Background Art

[0002] In the solution for water quality and bioburden detection, filtration is usually performed through an integrated filter with a filter membrane. The filter with a filter membrane is installed on a body. The body usually includes a pump body, a one-way valve and a drain pipe. The bottom of the filter is sealed and connected to the one-way valve. The water in the filter is discharged into the drain pipe through the filter membrane through the pump body. The microorganisms in the water are distributed on the filter membrane. Finally, the filter membrane with microorganisms is transferred to the culture medium.

[0003] For example, the Chinese invention patent with application number CN201710168415.3, publication (announcement) number CN107022477B, and title “A Microbial Limit Detector with Good Sealing Effect” discloses “a machine body, a filter, a filter membrane fixedly connected inside the filter, a homogenizer fixedly connected to the top of the filter, a sealing device fixedly connected to the top of the homogenizer, a connecting pipe located at the top of the homogenizer, a shell fixedly connected to the top of the connecting pipe, a partition layer fixedly connected to the inner wall of the shell, and an infusion channel arranged inside the shell. The microbial limit detector with good sealing effect, by setting a one-way valve, the one-way valve ensures that the liquid can only flow in one direction, and the liquid can only flow out of the microbial limit detector with good sealing effect, thereby ensuring that external bacteria and other microorganisms are difficult to enter the interior of the microbial limit detector with good sealing effect to affect the detection data”.

[0004] Although the prior art and the above patents can make improvements in preventing external bacteria from entering the filter, thereby improving the accuracy of the detection data, the applicant has found in the actual operation process that there are at least the following deficiencies:

[0005] As is known to all, the filter membrane is relatively soft. When water contacts the filter membrane, wrinkles are very likely to appear on the filter membrane under the impact of water. The appearance of wrinkles will inevitably affect the difficulty of microbial recovery, resulting in a decrease in the microbial recovery rate. In order to prevent wrinkles from appearing on the filter membrane, a support membrane (usually hydrophobic cotton) is added under the filter membrane in the prior art. The filter membrane can maintain a good flatness under the impact of water under the support of the support membrane. However, this method has brought new technical problems: in the prior art, the bottom cover of the filter is usually installed by screwing during assembly. During the process, the bottom cover presses the filter membrane and seals it in the filter. Although the screw connection can better achieve the sealing effect, the screw connection requires rotation. During the rotation, the bottom cover squeezes the filter membrane while rotating, thereby applying a rotational squeezing force to the filter membrane. The rotational squeezing force can easily cause wrinkles to appear on the filter membrane before filtration, so that the wrinkles still exist during filtration. It can be seen that how to ensure that the filter membrane is squeezed and sealed while preventing wrinkles from appearing on the filter membrane to ensure the recovery rate of microorganisms while retaining the screw connection seal of the bottom cover is a technical problem that needs to be solved urgently. Summary of the invention

[0006] The object of the present invention is to provide a filtering device with a hydrophobic cotton support membrane to solve the above-mentioned deficiencies in the prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solution: a filtering device with a hydrophobic cotton support membrane, comprising a body and a filter screwed on the body, the filter comprising:

[0008] A container, the bottom of which is provided with a lower screw nozzle;

[0009] A bottom cover, the top of which is provided with an upper screw connection ring screwed to the lower screw mouth, and the bottom of which is provided with a lower screw connection ring screwed to the machine body;

[0010] A core piece is rotatably arranged inside the bottom cover, a through hole is opened on the core piece, and the top of the core piece is used to support the hydrophobic cotton;

[0011] A pressing cylinder, which is elastically axially slidably sleeved on the core piece, the top of the pressing cylinder is higher than the top of the core piece and is provided with a filter membrane;

[0012] The filter membrane is elastically squeezed between the lower screw nozzle and the pressing cylinder. Due to the friction between the filter membrane and the lower screw nozzle and between the filter membrane and the pressing cylinder, the pressing cylinder and the core member do not rotate during the process of rotating the bottom cover to screw the upper screw ring and the lower screw nozzle. The spiral upward movement of the bottom cover drives the pressing cylinder to elastically move vertically downward so that the filter membrane is only subjected to an increasing axial squeezing force.

[0013] The above-mentioned filtering device with a hydrophobic cotton support membrane, the core component includes a fixedly connected annular plate and a support column, the inner wall of the bottom cover is provided with a limiting ring groove for inserting the circular side edge of the annular plate, and a plurality of balls are rollingly embedded in the bottom of the annular plate, and the bottoms of the plurality of balls are in contact with the bottom surface of the limiting ring groove.

[0014] The above-mentioned filtering device with a hydrophobic cotton support membrane has a column fixedly installed at the bottom of the pressure cylinder, and a reciprocating plate is fixedly installed after the bottom of the column slides through the annular plate, and a sealing plug that matches the through hole is fixedly provided on the reciprocating plate. When the container and the bottom cover are separated, the sealing plug is plugged into the through hole to prevent external dust from entering the through hole from the bottom.

[0015] In the above-mentioned filtering device with a hydrophobic cotton support membrane, when the bottom cover is rotated and screwed onto the container, the reciprocating plate moves downward as the pressure cylinder moves downward to drive the sealing plug to slide out of the through hole to allow filtered water to flow.

[0016] The above-mentioned filtering device with a hydrophobic cotton support membrane is provided with a plurality of guide holes on the support column, and a plurality of push rods are fixedly installed on the reciprocating plate and are plugged into and matched with the plurality of guide holes one by one. When the container and the bottom cover are separated, the tops of the plurality of push rods protrude from the top of the support column so that during the process of removing the bottom cover, the plurality of push rods can lift up the hydrophobic cotton and separate it from the top of the support column.

[0017] In the above-mentioned filtration device with hydrophobic cotton support membrane, in the initial state, the top height of the pressing cylinder is higher than the top height of the upper screw-connecting ring so that the filter membrane will not be blocked by the upper screw-connecting ring when it is removed.

[0018] In the above-mentioned filtration device with a hydrophobic cotton support membrane, in an initial state, the top height of the hydrophobic cotton placed on the top rod is lower than the top height of the pressing cylinder to form a gap between the filter membrane and the hydrophobic cotton. When the bottom cover is assembled, the gap between the filter membrane and the hydrophobic cotton disappears as the pressing cylinder and multiple top rods are driven downward synchronously as the bottom cover rotates.

[0019] The above-mentioned filtering device with a hydrophobic cotton support membrane, the top rod is dynamically sealed and plugged into the guide hole. Based on the gap between the filter membrane and the hydrophobic cotton, when the top of the top rod moves into the guide hole and continues to move downward, the top openings of the multiple guide holes generate suction to adsorb the hydrophobic cotton so that the hydrophobic cotton is tightly fitted to the top surface of the support column.

[0020] The above-mentioned filtering device with a hydrophobic cotton support membrane, based on the gap between the filter membrane and the hydrophobic cotton, allows the filter membrane to be lifted up and separated from the top surface of the pressing cylinder due to the gravity of the water remaining in the filter membrane and the hydrophobic cotton when the bottom cover is removed after the filtration is completed, so as to facilitate the removal of the filter membrane.

[0021] The above-mentioned filtering device with a hydrophobic cotton support membrane is based on the fact that the top height of the hydrophobic cotton placed on the top rod is lower than the top height of the pressing cylinder, so that when the filter membrane is removed, the pressing cylinder has a blocking effect on the hydrophobic cotton, and the filter membrane can be separated from the hydrophobic cotton by simply pulling it flat.

[0022] Beneficial effect: In the above technical scheme, the present invention provides a filtering device with a hydrophobic cotton support membrane. In the process of assembling the container and the bottom cover so that the filter membrane is sealed and pressed, before rotating the bottom cover, the filter membrane is elastically squeezed by the pressing cylinder, so that there is friction between the filter membrane and the lower screw nozzle and between the filter membrane and the pressing cylinder, and at this time, the sum of the friction between the filter membrane and the lower screw nozzle and the pressing cylinder is greater than the rotational resistance between the core piece and the bottom cover. Then, the bottom cover is rotated so that the bottom cover is screwed to the container, and the core piece and the pressing cylinder do not rotate, so that the pressing cylinder will not produce rotational squeezing on the filter membrane. The bottom cover is continuously moved upward to make the pressing cylinder continuously move downward relative to the bottom cover, thereby continuously increasing the axial extrusion force of the pressing cylinder on the filter membrane until the filter membrane is tightly sealed, and at this time, the bottom of the filter membrane is in contact with the top of the hydrophobic cotton. During the whole process, the filter membrane will not be subjected to the rotational extrusion force, but only to the axial extrusion force, so that the filter membrane will not be wrinkled when the assembly is completed. Therefore, the present invention can ensure that the filter membrane is squeezed and sealed while preventing the filter membrane from wrinkling to ensure the recovery rate of microorganisms while retaining the screw-connected seal of the bottom cover, and can effectively solve the shortcomings of the prior art;

[0023] Furthermore, the ingenious use of the elastic sliding of the pressing cylinder in the present invention can not only realize the axial extrusion of the filter membrane to prevent the filter membrane from wrinkling, but also can automatically realize the conduction and closure of the through hole by utilizing the elastic sliding of the pressing cylinder, so that when the filter is disassembled and placed, external dust can be effectively prevented from entering the through hole from the bottom;

[0024] At the same time, in the present invention, the arrangement of multiple push rods plays at least three roles: first, it can limit the pressure cylinder and the reciprocating plate to prevent relative rotation between the pressure cylinder and the core member; second, after the bottom cover is removed, the hydrophobic cotton and the filter membrane are lifted up by the multiple push rods so that the bottom of the hydrophobic cotton is separated from the top of the support column, thereby greatly reducing the contact area of ​​the bottom of the hydrophobic cotton, so that it is more convenient and safe to remove the hydrophobic cotton and it is not easy to cause damage to the filter membrane; third, the downward movement of the multiple push rods can generate suction at the top of the multiple guide holes, and the suction force sucks the hydrophobic cotton downward so that the bottom of the hydrophobic cotton and the top of the support column fit more closely and firmly, thereby greatly improving the utilization efficiency of the push rods;

[0025] Furthermore, the present invention utilizes the gap between the hydrophobic cotton and the filter membrane, which not only allows the guide hole to generate suction on the hydrophobic cotton to make the hydrophobic cotton fit more closely to the support column, but also produces an unexpected technical effect, making the removal of the filter membrane more convenient and safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0027] Figure 1 A schematic diagram of the structure of a filtering device provided in an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of the explosion structure of a filter provided by an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the structure of the core member and the pressing cylinder combined and a schematic diagram of the structure of the reciprocating plate provided in an embodiment of the present invention;

[0030] Figure 4 The embodiment of the present invention provides Figure 3 Schematic diagram from top view;

[0031] Figure 5 A schematic diagram of the cross-sectional structure of the filter in a state where the lower screw nozzle extrusion cylinder moves downward during the assembly of the bottom cover of the container box provided by an embodiment of the present invention so that the filter membrane is elastically compressed and the bottom cover is not rotated;

[0032] Figure 6 A schematic cross-sectional view of the bottom cover after the hydrophobic cotton and the filter membrane are placed in the initial state provided by an embodiment of the present invention;

[0033] Figure 7 A schematic cross-sectional view of the filter in a state where the bottom cover is rotated during the assembly of the bottom cover of the container box provided by an embodiment of the present invention;

[0034] Figure 8 The embodiment of the present invention provides Figure 7 3D graph of

[0035] Fig. 9 The embodiment of the present invention provides Figure 8 A schematic diagram of the enlarged structure of part A;

[0036] Fig.10 A schematic diagram of the cross-sectional structure of the filter after the bottom cover is removed after filtering is completed according to an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 1. Container; 101. Ventilation cover; 102. Upper screw nozzle; 103. Lower screw nozzle; 2. Bottom cover; 201. Upper screw ring; 202. Middle cylinder; 2021. Accommodating chamber; 2022. Limiting ring groove; 203. Lower screw ring; 3. Pressing cylinder; 301. Extension plate; 4. Column; 5. Reciprocating plate; 501. Sealing plug; 502. Staggered mouth; 6. Annular plate; 601. Avoidance hole; 7. Support column; 701. Through hole; 702. Guide hole; 8. Push rod; 9. Compression spring; 10. Ball; 11. Filter membrane; 12. Hydrophobic cotton; 13. One-way valve; 14. Machine body. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] like Figure 1-10 As shown, a filtering device with a hydrophobic cotton support membrane provided by an embodiment of the present invention includes a body 14 and a filter screwed on the body 14, and the filter includes:

[0041] A container 1, the bottom of which is provided with a lower screw nozzle 103;

[0042] A bottom cover 2, the top of which is provided with an upper screw connection ring 201 screwed to the lower screw nozzle 103, and the bottom of which is provided with a lower screw connection ring 203 screwed to the body 14;

[0043] A core piece is rotatably disposed inside the bottom cover 2, a through hole 701 is opened on the core piece, and the top of the core piece is used to support the hydrophobic cotton 12;

[0044] A pressing cylinder 3, which is elastically axially slidably sleeved on the core member, the top of the pressing cylinder 3 is higher than the top of the core member and is provided with a filter membrane 11;

[0045] The filter membrane 11 is elastically squeezed between the lower screw nozzle 103 and the pressing cylinder 3. Due to the friction between the filter membrane 11 and the lower screw nozzle 103 and between the filter membrane 11 and the pressing cylinder 3, the pressing cylinder 3 and the core member do not rotate during the process of rotating the bottom cover 2 to screw the upper screw ring 201 and the lower screw nozzle 103. The spiral upward movement of the bottom cover 2 drives the pressing cylinder 3 to elastically move vertically downward so that the filter membrane 11 is only subjected to an increasing axial extrusion force.

[0046] The filter device with a hydrophobic cotton support membrane provided in the present embodiment is used to filter water, so that the microorganisms in the water are attached to the filter membrane, and the recovery rate of microorganisms can be improved to a greater extent. The words related to the direction and position involved in the present embodiment are relative to the accompanying drawings, and the "initial state" involved in the present embodiment refers to the state when the bottom cover 2 is not assembled on the container 1. Specifically, the body 14 includes a pump body, a drain pipe and a one-way valve 13, and the one-way valve 13 is used to be screwed with the filter seal, and the negative pressure is generated by starting the pump body, so that the water in the filter flows into the drain pipe through the one-way valve 13 and is discharged, and the microorganisms in the water are filtered out and attached to the filter membrane 11, wherein the number of the one-way valve 13 can be one or more, and it is not repeated. The filter includes a container 1, and the container 1 is used to hold the water to be filtered, and the top of the container 1 is screwed with a ventilated cover 101 through an upper screw mouth 102, and the bottom of the container 1 is screwed with a bottom cover 2 through a lower screw mouth 103. When the container 1 and the bottom cover 2 are assembled, the bottom cover 2 can be rotated. The bottom cover 2 includes an upper screw ring 201, a middle tube 202, and a lower screw ring 203 which are arranged in sequence. The top of the bottom cover 2 is the upper screw ring 201 which is sealingly screwed to the lower screw nozzle 103, the bottom of the bottom cover 2 is the lower screw ring 203 which is sealingly screwed to the one-way valve 13 on the body 14, and the middle part of the bottom cover 2 is the middle tube 202 which is sealingly fixedly connected to the upper screw ring 201 and the lower screw ring 203.The top of the core piece is used to support the hydrophobic cotton 12, and the core piece is rotatably arranged inside the bottom cover 2. Its purpose is: when the bottom cover 2 is rotated, the core piece can rotate relative to the bottom cover 2. When the external resistance of the core piece is greater than the power brought to the core piece by the bottom cover 2, the core piece will not rotate, and then the hydrophobic cotton 12 will not rotate. At the same time, since the pressing cylinder 3 is elastically axially slidably sleeved on the core piece, the pressing cylinder 3 will not rotate when the core piece does not rotate during the rotation of the bottom cover 2, and the filter membrane 11 is located between the lower screw nozzle 103 and the pressing cylinder 3. The filter membrane 11 is sealed between the lower screw nozzle 103 and the pressing cylinder 3 through the extrusion force of the lower screw nozzle 103 and the pressing cylinder 3. In the initial state, the top of the pressing cylinder 3 is higher than the top of the core piece. Since the pressing cylinder 3 is axially elastically slidably arranged, when the container 1 and the bottom cover 2 are assembled, the filter membrane 11 is first placed on the top of the pressing cylinder 3, and then the pressing cylinder 3 and the lower screw nozzle are axially slidably sleeved. 103 is pressed against, and an upward force is applied to the bottom cover 2 to make the pressing cylinder 3 elastically move downward, so that the pressing cylinder 3 elastically squeezes the filter membrane 11. At this time, there is friction between the filter membrane 11 and the lower screw nozzle 103 and between the filter membrane 11 and the pressing cylinder 3, and at this time, the sum of the friction between the filter membrane 11, the lower screw nozzle 103 and the pressing cylinder 3 is greater than the rotational resistance between the core piece and the bottom cover 2. Then, the bottom cover 2 is rotated to make the bottom cover 2 screwed to the container 1, while the core piece and the pressing cylinder 3 do not rotate, and thus the pressing cylinder 3 will not generate a rotational squeezing force on the filter membrane 11. At the same time, the bottom cover 2 is continuously moved upward to make the pressing cylinder 3 continuously move downward relative to the bottom cover 2, thereby continuously increasing the axial squeezing force of the pressing cylinder 3 on the filter membrane 11 until the filter membrane 11 is compacted. During the whole process, the filter membrane 11 will not be subjected to a rotational squeezing force, but will only be subjected to an axial squeezing force. Therefore, when the assembly is completed, the filter membrane 11 will not be wrinkled. Furthermore, when the filter membrane 11 is compacted and the assembly of the container 1 and the bottom cover 2 is completed, the bottom of the filter membrane 11 fits against the top of the hydrophobic cotton 12, so that the hydrophobic cotton 12 supports the filter membrane 11 and prevents the filter membrane 11 from wrinkling during the filtering process. The through hole 701 opened on the core is used to allow water to enter the drain pipe and be discharged.

[0047] It can be seen that in the present invention, during the process of assembling the container 1 and the bottom cover 2 so that the filter membrane 11 is sealed and pressed, before the bottom cover 2 is rotated, the filter membrane 11 is elastically squeezed by the pressing cylinder 3, so that there is friction between the filter membrane 11 and the lower screw nozzle 103 and between the filter membrane 11 and the pressing cylinder 3, and at this time, the sum of the friction between the filter membrane 11 and the lower screw nozzle 103 and the pressing cylinder 3 is greater than the rotational resistance between the core piece and the bottom cover 2, and then the bottom cover 2 is rotated so that the bottom cover 2 is screwed to the container 1, while the core piece and the pressing cylinder 3 do not rotate, so that the pressing cylinder 3 does not generate a rotational squeezing force on the filter membrane 11, and at the same time the bottom cover 2 The pressing cylinder 3 is continuously moved upward to move downward relative to the bottom cover 2, thereby continuously increasing the axial extrusion force of the pressing cylinder 3 on the filter membrane 11, until the filter membrane 11 is compressed and sealed, and at this time the bottom of the filter membrane 11 is in contact with the top of the hydrophobic cotton 12. During the whole process, the filter membrane 11 will not be subjected to rotational extrusion force, but only axial extrusion force, so that the filter membrane 11 will not be wrinkled when the assembly is completed. Therefore, the present invention can ensure that the filter membrane is squeezed and sealed while preventing wrinkles from appearing on the filter membrane to ensure the recovery rate of microorganisms while retaining the screw-connected seal of the bottom cover, which can effectively solve the shortcomings of the prior art.

[0048] In this embodiment, the core member includes a fixedly connected annular plate 6 and a support column 7, the inner wall of the bottom cover 2 is provided with a limiting annular groove 2022 for inserting the circular side of the annular plate 6, and a plurality of balls 10 are rotatably embedded in the bottom of the annular plate 6, and the bottoms of the plurality of balls 10 abut against the bottom surface of the limiting annular groove 2022. Specifically, the annular plate 6 and the support column 7 are coaxial, the through hole 701 is provided on the support column 7, the hydrophobic cotton 12 is attached to the top of the support column 7, and water flows into the body 14 through the filter membrane 11, the hydrophobic cotton 12, the through hole 701 and the one-way valve 13 in sequence, the annular plate 6 is rotatably arranged in the limiting annular groove 2022, and the arrangement of the plurality of balls 10 can effectively reduce the friction between the annular plate 6 and the limiting annular groove 2022, thereby improving the smoothness of the core member rotation.

[0049] Furthermore, a column 4 is fixedly installed at the bottom of the pressing cylinder 3. The number of the columns 4 is multiple and they are arranged circumferentially at equal angles. After the bottom of the column 4 slides through the annular plate 6, a reciprocating plate 5 is fixedly installed. The annular plate 6 is provided with an avoidance hole 601 for the column 4 to slide through. A sealing plug 501 matching the through hole 701 is fixedly provided on the reciprocating plate 5. When the container 1 and the bottom cover 2 are separated, the sealing plug 501 is plugged into the through hole 701 to prevent external dust from entering the through hole 701 from the bottom.

[0050] When the bottom cover 2 is screwed to the container 1, the reciprocating plate 5 moves downward as the pressing cylinder 3 moves downward, so as to drive the sealing plug 501 to slide out of the through hole 701 to allow the filtered water to flow.

[0051] Specifically, when the filter is removed from the body 14 and placed, the bottom of the through hole 701 is directly exposed to the outside, which makes it easy for external dust to enter the through hole 701 from the bottom. However, the through hole 701 is small in diameter and difficult to clean. For this reason, the present invention cleverly utilizes the elastic sliding of the pressing cylinder 3. In the initial state, the pressing cylinder 3 is located at the top based on the elastic force. At this time, the sealing plug 501 is inserted at the bottom of the through hole 701, thereby preventing external dust from entering the through hole 701 from the bottom. When the container 1 and the bottom cover 2 are assembled, the pressing cylinder 3 will be squeezed by the lower screw nozzle 103 and slide downward elastically. The downward movement of the pressing cylinder 3 drives the reciprocating plate 5 to slide down synchronously through the column 4, and the downward movement of the reciprocating plate 5 drives the sealing plug 501 to slide out of the through hole 701, so that the through hole 701 is conductive. When the filter is removed, the pressing cylinder 3 is reset, so that the sealing plug 501 is inserted into the bottom of the through hole 701 again to achieve sealing.

[0052] It can be seen that the elastic sliding of the pressure cylinder 3 in the present invention can not only realize axial extrusion of the filter membrane 11 to prevent wrinkles on the filter membrane 11, but also can utilize the elastic sliding of the pressure cylinder 3 to automatically realize the conduction and closure of the through hole 701, so that when the filter is disassembled and placed, external dust can be effectively prevented from entering the through hole 701 from the bottom.

[0053] At the same time, the presence of multiple columns 4 between the pressing cylinder 3 and the core piece produces a limiting effect, which makes it impossible for the pressing cylinder 3 and the core piece to rotate relative to each other. Similarly, when the core piece does not rotate, the pressing cylinder 3 cannot rotate either. Since the core piece is rotatably connected to the bottom cover 2, the core piece does not rotate when the bottom cover 2 is rotated, and thus the pressing cylinder 3 does not rotate when the bottom cover 2 is rotated, and no rotational squeezing force is generated on the filter membrane 11.

[0054] In this embodiment, a plurality of guide holes 702 are provided on the support column 7, and a plurality of push rods 8 are fixedly installed on the reciprocating plate 5, which are plugged into and matched with the plurality of guide holes 702 one by one. When the container 1 and the bottom cover 2 are separated, the tops of the plurality of push rods 8 protrude from the top of the support column 7, so that during the process of removing the bottom cover 2, the plurality of push rods 8 lift up the hydrophobic cotton 12 and separate it from the top of the support column 7. Specifically, the setting of the plurality of push rods 8 can not only limit the pressing cylinder 3 and the reciprocating plate 5, and prevent the pressing cylinder 3 and the core from rotating relative to each other, but also the present invention cleverly utilizes the fact that the tops of the push rods 8 protrude from the top of the support column 7 in the initial state, so that when the bottom cover 2 is removed after filtering, the plurality of push rods 8 are reset along with the reset of the pressing cylinder 3, and at this time, the tops of the plurality of push rods 8 lift up the hydrophobic cotton 12, thereby preventing the hydrophobic cotton 12 from fitting with the top of the support column 7. Since the hydrophobic cotton 12 contains water, if the hydrophobic cotton 12 fits with the top of the support column 7 after filtering, the adhesion between the hydrophobic cotton 12 and the support column 7 will be greatly increased. Therefore, it is very inconvenient to remove the hydrophobic cotton 12. The filter membrane 11 is above the hydrophobic cotton 12 and covers the hydrophobic cotton 12. When the hydrophobic cotton 12 is removed, the filter membrane 11 will inevitably be removed together. Based on the adhesion between the hydrophobic cotton 12 and the top surface of the support column 7, the filter membrane 11 is easily damaged when the hydrophobic cotton 12 and the filter membrane 11 are removed. The present invention uses the arrangement of multiple push rods 8, so that after the bottom cover 2 is removed, the hydrophobic cotton 12 and the filter membrane 11 are lifted up by the multiple push rods 8 and separated from the top of the support column 7, thereby greatly reducing the contact area of ​​the bottom of the hydrophobic cotton 12, so that it is more convenient and safer to remove the hydrophobic cotton 12, and it is not easy to cause damage to the filter membrane 11;

[0055] Furthermore, in the initial state, the top height of the pressing cylinder 3 is higher than the top height of the upper screw-connecting ring 201 so that the filter membrane 11 is not blocked by the upper screw-connecting ring 201 when being removed;

[0056] Further, if Figure 6 As shown, in the initial state, the top height of the hydrophobic cotton 12 placed on the top rod 8 is lower than the top height of the pressing cylinder 3 so that a gap is formed between the filter membrane 11 and the hydrophobic cotton 12, as shown in FIG. Figure 7 As shown, when the bottom cover 2 is assembled, the gap between the filter membrane 11 and the hydrophobic cotton 12 disappears during the process of the pressing cylinder 3 and the multiple push rods 8 being synchronously moved downward as the bottom cover 2 rotates. At this time, the filter membrane 11 and the hydrophobic cotton 12 fit together, so that the filter membrane 11 is effectively supported by the hydrophobic cotton 12, and the bottom of the hydrophobic cotton 12 fits with the top of the support column 7, so that the hydrophobic cotton 12 is supported by the support column 7;

[0057] Further, if Figure 7As shown, the top rod 8 is dynamically sealed and plugged into the guide hole 702. Based on the gap between the filter membrane 11 and the hydrophobic cotton 12, when the top of the top rod 8 moves into the guide hole 702 and continues to move downward, the top openings of the multiple guide holes 702 generate suction and absorb the hydrophobic cotton 12 so that the hydrophobic cotton 12 fits tightly with the top surface of the support column 7. Specifically, dynamic sealing plug-in refers to sliding and sealing plug-in. When the top of the top rod 8 moves into the guide hole 702, the bottom of the hydrophobic cotton 12 fits with the top of the support column 7. Then, as the bottom cover 2 continues to rotate, the pressing cylinder 3 drives the multiple top rods 8 to continue to move downward. At this time, the top openings of the multiple guide holes 702 generate suction, and the suction absorbs the hydrophobic cotton 12 downward so that the bottom of the hydrophobic cotton 12 fits more tightly and firmly with the top of the support column 7. It can be seen that in the present invention, the arrangement of multiple push rods 8 plays at least three roles: first, it can limit the pressure cylinder 3 and the reciprocating plate 5 to prevent relative rotation between the pressure cylinder 3 and the core member; second, after the bottom cover 2 is removed, the hydrophobic cotton 12 and the filter membrane 11 are lifted up by the multiple push rods 8 so that the bottom of the hydrophobic cotton 12 is separated from the top of the support column 7, thereby greatly reducing the contact area of ​​the bottom of the hydrophobic cotton 12, so that it is more convenient and safe to remove the hydrophobic cotton 12, and it is not easy to cause damage to the filter membrane 11; third, the downward movement of the multiple push rods 8 can cause the top openings of the multiple guide holes 702 to generate suction, and the suction force sucks the hydrophobic cotton 12 downward so that the bottom of the hydrophobic cotton 12 fits more closely and firmly with the top of the support column 7, thereby greatly improving the utilization efficiency of the push rods 8.

[0058] Furthermore, based on the gap between the filter membrane 11 and the hydrophobic cotton 12, when the bottom cover 2 is removed after the filtration is completed, the circumference of the filter membrane 11 is lifted up and separated from the top surface of the pressing cylinder 3 due to the gravity of the water remaining in the filter membrane 11 and the hydrophobic cotton 12, so that the filter membrane 11 can be easily removed. Fig.10 As shown, after the filtration is completed, the filter membrane 11 and the hydrophobic cotton 12 are both soaked in water to increase their gravity, and the hydrophobic cotton 12 is located on the inner side of the pressing cylinder 3, and the filter membrane 11 is located on the top of the pressing cylinder 3. Based on the gap between the filter membrane 11 and the hydrophobic cotton 12 in the initial state, after the bottom cover 2 is removed, under the action of the gravity of the hydrophobic cotton 12 and the filter membrane 11, the filter membrane 11 has a slight center-down deformation, and the deformation amount will not cause wrinkles in the filter membrane 11. At this time, the side of the filter membrane 11 automatically tilts up and will not be completely in contact with the pressing cylinder 3, thereby providing space for removing the filter membrane 11. At this time, the filter membrane 11 can be easily clamped by tweezers to facilitate removal of the filter membrane 11 without causing damage to the filter membrane 11.

[0059] It can be seen that by utilizing the gap between the hydrophobic cotton 12 and the filter membrane 11, not only can the guide hole 702 generate suction on the hydrophobic cotton 12 to make the hydrophobic cotton 12 fit more closely to the support column 7, but it also produces an unexpected technical effect, making the removal of the filter membrane 11 more convenient and safe.

[0060] Furthermore, since the top height of the hydrophobic cotton 12 placed on the top rod 8 is lower than the top height of the pressing cylinder 3, the pressing cylinder 3 can block the hydrophobic cotton 12 when the filter membrane 11 is removed, and the filter membrane 11 can be separated from the hydrophobic cotton 12 by simply pulling it flat. It can be seen that the height difference between the pressing cylinder 3 and the hydrophobic cotton 12 not only creates a gap between the filter membrane 11 and the hydrophobic cotton 12 to produce the above-mentioned technical effect, but also can block the hydrophobic cotton 12 when the filter membrane 11 is removed, so that the filter membrane 11 can be separated from the hydrophobic cotton 12 smoothly.

[0061] In this embodiment, a receiving cavity 2021 is formed inside the middle cylinder 202, an extension plate 301 is fixedly mounted on the pressure cylinder 3, the extension plate 301 is located in the receiving cavity 2021 and does not contact, a plurality of compression springs 9 are evenly arranged circumferentially mounted between the extension plate 301 and the annular plate 6, the pressure cylinder 3 has an elastic sliding force based on the elastic force of the compression spring 9, the compression spring 9 is always in a compressed state, so that the sealing plug 501 can be tightly inserted into the through hole 701 in the initial state. The reciprocating plate 5 is provided with a staggered opening 502 staggered from the sealing plug 501, and part of the water flowing out of the through hole 701 flows out through the staggered opening 502.

[0062] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A filtering device having a hydrophobic cotton support membrane, comprising a body (14) and a filter screwed onto the body (14), characterized in that: The filters include: A container (1) having a lower screw nozzle (103) disposed at the bottom thereof; A bottom cover (2), the top of which is provided with an upper screw connection ring (201) screwed to the lower screw nozzle (103), and the bottom of which is provided with a lower screw connection ring (203) screwed to the machine body (14); a core piece, which is rotatably arranged inside the bottom cover (2), the core piece being provided with a through hole (701), and the top of the core piece being used to support the hydrophobic cotton (12); A pressing cylinder (3) which is elastically axially slidably sleeved on the core piece, the top of the pressing cylinder (3) being higher than the top of the core piece and having a filter membrane (11) placed thereon; The filter membrane (11) is elastically squeezed between the lower screw nozzle (103) and the pressing cylinder (3). Due to the friction between the filter membrane (11) and the lower screw nozzle (103) and between the filter membrane (11) and the pressing cylinder (3), the pressing cylinder (3) and the core member do not rotate during the process of rotating the bottom cover (2) to screw the upper screw ring (201) and the lower screw nozzle (103). The upward movement of the bottom cover (2) drives the pressing cylinder (3) to elastically move vertically downward so that the filter membrane (11) is only subjected to an axial squeezing force that continues to increase. The core member comprises an annular plate (6) and a support column (7) which are fixedly connected, the inner wall of the bottom cover (2) is provided with a limiting ring groove (2022) for inserting the circular side edge of the annular plate (6), a plurality of balls (10) are rotatably embedded in the bottom of the annular plate (6), and the bottoms of the plurality of balls (10) are in contact with the bottom surface of the limiting ring groove (2022); A column (4) is fixedly mounted on the bottom of the pressing cylinder (3); a reciprocating plate (5) is fixedly mounted on the bottom of the column (4) after sliding through the annular plate (6); a sealing plug (501) matching the through hole (701) is fixedly arranged on the reciprocating plate (5); when the container (1) and the bottom cover (2) are separated, the sealing plug (501) is plugged into the through hole (701) to prevent external dust from entering the through hole (701) from the bottom; The support column (7) is provided with a plurality of guide holes (702), and a plurality of push rods (8) are fixedly mounted on the reciprocating plate (5) and are plugged into and matched with the plurality of guide holes (702) one by one. When the container (1) and the bottom cover (2) are separated, the tops of the plurality of push rods (8) protrude from the top of the support column (7), so that during the process of removing the bottom cover (2), the plurality of push rods (8) lift up the hydrophobic cotton (12) and separate it from the top of the support column (7); In the initial state, the top height of the hydrophobic cotton (12) placed on the top rod (8) is lower than the top height of the pressing cylinder (3) so that a gap is formed between the filter membrane (11) and the hydrophobic cotton (12); when the bottom cover (2) is assembled, the gap between the filter membrane (11) and the hydrophobic cotton (12) disappears as the pressing cylinder (3) and the plurality of top rods (8) are synchronously moved downward as the bottom cover (2) rotates; Due to the gap between the filter membrane (11) and the hydrophobic cotton (12), when the bottom cover (2) is removed after the filtration is completed, the peripheral edge of the filter membrane (11) is lifted up and separated from the top surface of the pressing cylinder (3) due to the gravity of the water remaining in the filter membrane (11) and the hydrophobic cotton (12), so as to facilitate the removal of the filter membrane (11); Since the top height of the hydrophobic cotton (12) placed on the top rod (8) is lower than the top height of the pressing cylinder (3), when the filter membrane (11) is removed, the pressing cylinder (3) has a blocking effect on the hydrophobic cotton (12), and the filter membrane (11) can be separated from the hydrophobic cotton (12) by simply pulling it flat.

2. The filtration device with a hydrophobic cotton support membrane according to claim 1, characterized in that: When the bottom cover (2) is screwed onto the container (1), the reciprocating plate (5) moves downward as the pressing cylinder (3) moves downward, thereby driving the sealing plug (501) to slide out of the through hole (701) to allow filtered water to flow.

3. The filtration device with a hydrophobic cotton support membrane according to claim 1, characterized in that: In the initial state, the top height of the pressing cylinder (3) is higher than the top height of the upper screw-connecting ring (201) so that the filter membrane (11) is not blocked by the upper screw-connecting ring (201) when it is removed.

4. The filtration device with a hydrophobic cotton support membrane according to claim 1, characterized in that: The push rod (8) is dynamically sealed and plugged into the guide hole (702).

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