A sterile filter and filtering method thereof

Abstract

The present invention belongs to the technical field of aseptic filtration, specifically, an aseptic filter and a filtering method thereof, comprising a middle frame and a filter element, wherein the filter element is slidably installed in the middle frame along the vertical direction, and the filter element is hollow; the filter element also comprises filter membranes arranged on both sides of the core body, and the edges of the filter membranes are sealed and connected to the filter element; the upper and lower surfaces of the core body are concave; in the present invention, filter membranes are arranged on both sides of the core body of the filter element, thereby increasing the flux during filtration and thereby improving the filtration efficiency; at the same time, by arranging the core body into a structure with a concave surface, the area of ​​the filter membrane is further increased, thereby further increasing the filtration flux; and the filtered side is arranged in the middle of the two layers of membrane. Such an arrangement can make the filter membrane better fit with the filter element during the filtration process, thereby avoiding expansion and deformation of the filter element, which leads to a reduction in the filtration effect.

Description

Technical Field

[0001] The invention belongs to the technical field of aseptic filtration, in particular to an aseptic filter and a filtration method thereof. Background Art

[0002] A sterile filter is a device used to remove microorganisms and particles from liquids or gases. It is widely used in industries such as pharmaceuticals, food and beverages, biotechnology, and medical. Its main function is to achieve sterile filtration by using a special filter membrane to block bacteria, fungi, and other tiny particles on one side of the filter membrane through a physical barrier. The pore size of the filter membrane used in sterile filters is between 0.1 and 0.22 microns, which is sufficient to block most bacteria and fungi. When choosing a suitable filter, factors such as the chemical compatibility of its material, flow rate, pressure resistance, and temperature resistance need to be considered to meet specific application requirements. During use, regular inspection and replacement of the filter is also an important step to maintain its performance and prevent contamination.

[0003] The main structure of a sterile filter usually includes the following parts: Filter membrane: This is the core component of the filter. The filter membrane is usually made of materials such as polyvinylidene fluoride (PVDF), polyethersulfone (PES), nylon or polytetrafluoroethylene (PTFE), and different materials are selected according to application requirements. The pore size of the filter membrane is generally 0.1 to 0.22 microns, which is used to block bacteria and other tiny particles. Filter element: The filter membrane is usually supported on a rigid or semi-rigid filter element. The filter element can be designed to be folded to increase the surface area, thereby improving the filtration efficiency and flow rate. Housing: Used to protect the filter membrane and filter element, usually made of durable plastic or metal materials to ensure that it can withstand certain pressure and temperature changes. Interface: Used to connect the filter to the piping system, and there are various types of interfaces to meet different installation requirements.

[0004] When filtering, the filter usually uses pressure to make the medium to be filtered penetrate from one side to the other side. Therefore, most filters have two chambers separated by a filter membrane. However, due to the influence of the internal space, the butterfly filter can only have a single-layer filter membrane, which results in a small effective ventilation volume of the filtration. Therefore, there is an urgent need for a sterile filter that can achieve a large ventilation volume. Summary of the invention

[0005] In order to make up for the shortcomings of the prior art, the present invention proposes a sterile filter and a filtering method thereof. The present invention is mainly used to solve the problem that the flux of the existing butterfly-type sterile filter is small during filtering.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a sterile filter, comprising: a middle frame;

[0007] The filter element is slidably installed in the middle frame along the vertical direction, and the filter element is hollow; the filter element also includes filter membranes arranged on both sides of the core body, and the edges of the filter membranes are sealed and connected to the filter element; the upper and lower surfaces of the core body are concave;

[0008] The upper shell and the lower shell are installed on the upper and lower sides of the middle frame and form a closed cavity with the middle frame;

[0009] An air inlet pipe, one end of which is connected to the cavity, and the other end of which is connected to an external air source device;

[0010] An air outlet pipe; one end of the air outlet pipe passes through the middle frame and is connected to the internal cavity of the filter element, and the other end is connected to the external exhaust device.

[0011] By arranging filter membranes on both sides of the core of the filter element, the flux during filtration can be increased, thereby improving the filtration efficiency; at the same time, by arranging the core body to have a concave surface, the area of ​​the filter membrane is further increased, thereby further increasing the filtration flux; and the filtered side is arranged in the middle of the two layers of membrane. This arrangement can make the filter membrane fit better with the filter element during the filtration process, avoiding expansion and deformation of the filter element, which would lead to a reduction in the filtration effect.

[0012] The middle frame is symmetrically provided with card slots on the upper and lower sides; the upper shell and the card shell are provided with bosses at their edges; the card slots and the bosses are slidably installed; the card slots are tightly fitted with the bosses;

[0013] A receiving platform is provided on both sides of the middle frame; a ball plunger is installed on the receiving platform; and a notch is provided on the upper shell and the lower shell at a position corresponding to the ball plunger;

[0014] The filter element also includes a connector; one end of the core body close to the air outlet pipe is slidably connected to the connector; one end of the connector head away from the air outlet pipe is fixedly connected to a support spring; the other end of the support spring is fixedly connected to the core body;

[0015] A core replacement component, which is used to install a new filter element into the middle frame;

[0016] Old removal parts, used to remove the used filter element to be replaced from the middle frame;

[0017] Collecting component; the collecting component is used to collect the filter element removed from the old components.

[0018] When the filter element needs to be replaced, the old filter element is first removed and collected into the collection component by removing the old parts; before removal, the edge of the collection box of the collection component is pressed against the lower shell, and then the lower shell is pushed to slide along the slide groove; the collection component is replaced to the position of the lower shell, and then the core shell on the core replacement component is pressed against the edge of the upper shell, and then the upper shell is pushed to slide along the slide groove, and then the position of the upper shell is replaced with the core replacement component, and the new filter element is replaced into the filter by using the core replacement component, so that the filter element will not be directly contacted with the old filter element during the replacement process, and the contact with the inside of the filter can be further reduced during the replacement process. The risk of bacterial contamination of the user during the replacement process is increased, and the cleanliness of the filter replacement process is improved.

[0019] Preferably, the old removal component includes a channel opened in the middle frame; both ends of the channel are located at the air inlet end; a slide groove is symmetrically opened on the inner side of the middle frame; the slide groove is connected to the channel; a push rod is slidably connected in the slide groove; one end of the push rod is fixedly connected to a reset spring, and the other end of the reset spring is fixedly connected to the bottom of the slide groove;

[0020] A regulating component for regulating the flow direction of an external gas source is provided between the middle frame and the air inlet pipe; the flow direction of the gas source includes either flowing into the cavity or flowing into the channel;

[0021] Inclined parts are symmetrically arranged on both sides of the filter element; the other end of the push rod abuts against the inclined part.

[0022] Preferably, the adjustment assembly includes a rotating drum rotatably connected to the middle frame; the middle frame is fixedly connected to a first baffle on one side of the rotating drum; the first baffles are evenly spaced and fan-shaped; a second baffle is fixedly connected to a side of the rotating drum close to the first baffle; the first baffle is in conflict with the second baffle; the second baffle and the first baffle can completely block the cross section of the rotating drum;

[0023] Through holes are symmetrically provided on the side of the drum; a mounting box is fixedly connected to the outside of the middle frame; a rack is slidably connected to the mounting box; a gear is fixedly connected to the drum; the gear meshes with the rack;

[0024] A flexible tube is fixedly connected to one end of the drum away from the middle frame; a one-way valve is fixedly installed on one end of the flexible tube away from the drum, and the other end of the one-way valve is connected to the air intake pipe;

[0025] A pressure relief switch is installed on one side of the middle frame; the pressure relief switch is connected to the inside of the channel.

[0026] Preferably, a groove is provided on the side of the second baffle plate close to the first baffle plate; a sealing ring is embedded in the groove; the sealing ring is a hollow structure; the inside of the sealing ring is filled with a gas medium (which can be air, nitrogen or oxygen), and the wall thickness of the sealing ring on the side close to the first baffle plate is thickened.

[0027] By arranging a sealing ring between the No. 1 baffle and the No. 2 baffle, in the process of blocking the entry, as the pressure in the channel increases, the No. 2 baffle gradually squeezes the sealing ring, thereby increasing the sealing performance of the contact position between the No. 1 baffle and the No. 2 baffle; at the same time, by arranging the sealing ring to be hollow, when the No. 1 baffle and the No. 2 baffle are squeezed against each other, the sealing ring is more easily deformed, thereby forming a deformed sealing structure at the edge where the No. 1 baffle and the No. 2 baffle contact, and in the design, the edges of the No. 1 baffle and the No. 2 baffle can be closer when they are rotated to the closed position, thereby increasing the flow cross-sectional area in the open position, thereby ensuring the flux of the filter.

[0028] Preferably, the core replacement component includes a core shell; a plurality of filter elements are evenly spaced inside the core shell; pads are provided between the filter elements; a spiral hole is provided on the upper portion of the core shell; an extrusion rod is provided inside the spiral hole; the spiral hole is threadedly connected to the extrusion rod; an extrusion plate is rotatably connected to the lower portion of the extrusion rod; and a ventilation groove is provided on the lower surface of the extrusion plate.

[0029] The extrusion rod is rotated to move downward, thereby pushing the new filter element in the core shell that contacts the inner wall of the core shell downward. After the new filter element moves downward into position, the extrusion rod is rotated in the opposite direction, and then the core replacement component is pushed out from the side by the upper shell, completing the installation of the new filter element.

[0030] Since there is a filter membrane on the filter element, it is not convenient to press the extrusion plate directly on the filter membrane. Therefore, an extrusion plate is arranged on the extrusion rod to increase the contact area to prevent damage to the filter membrane. At the same time, since the core body has a concave surface structure, after the extrusion plate contacts it, when it is detached, it adsorbs the filter membrane and causes the risk of damage to the filter membrane. Therefore, in this solution, a breathable groove is arranged on the lower surface of the pressure plate to avoid adsorption during detachment and ensure the integrity of the filter membrane.

[0031] Preferably, a guide column is fixedly connected inside the spiral hole; a spiral groove is opened on the extrusion rod; the spiral groove is slidably connected to the guide column; and the pitch of the spiral groove gradually decreases from bottom to top.

[0032] Since the spiral groove is a variable pitch spiral structure, the extrusion plate will move downward more quickly in the early stage of rotation, enabling faster replacement. When the filter element is close to the installation position, the pitch is reduced, and the extrusion rod will move downward a smaller distance for the same rotation. This allows the new filter element to be installed more accurately, avoiding the new filter element from being detached due to excessive extrusion of the extrusion rod, thereby improving the accuracy and controllability of the installation.

[0033] Preferably, the collecting component comprises a collecting box; a magnetic block is fixedly arranged inside the collecting box; the cushion block on the filter element is made of magnetic rubber; and an electrostatic adsorption film is attached to the inner surface of the collecting box.

[0034] Since a pad made of magnetic rubber is provided on the lower surface of the filter element, when the used filter element is removed, when the old filter element falls off and falls into the collection box, the old filter element is adsorbed by the magnetic block, and the old filter element inside will jump out or shake during the removal of the collection box. At the same time, by providing an electrostatic adsorption film inside the collection box, the dust scattered on the filter element during the removal process is adsorbed onto the electrostatic adsorption film through the effect of electrostatic adsorption, so as to avoid the spread of dust and bacteria, thereby improving the cleanliness during the filter element replacement process.

[0035] The present invention also provides a filtration method of a sterile filter, comprising the following steps:

[0036] S1: Install the filter element. Open the upper housing of the filter, then place the filter element horizontally in the middle frame, press the upper edge of the filter element, push the filter element until the connector on the filter element is connected to the air outlet pipe at one end of the middle frame, and then close the upper housing.

[0037] S2: Preliminary filtration test: connect the air inlet pipe of the filter to the external air source, then place the detection head of the detector at the outlet pipe end of the filter for detection, and judge whether it is qualified according to the test results;

[0038] If qualified, proceed to the next step; if unqualified, reinstall the filter element;

[0039] S3: Filtration: connect the air outlet pipe of the filter to the external exhaust device for filtering;

[0040] S4: Replace the filter element; judge whether to replace the filter element by observing the state of the flexible tube; if necessary, replace it;

[0041] First, the edge of the collecting box of the collecting component is pressed against the lower shell, and then the lower shell is pushed to slide along the slide groove; and the collecting component is replaced to the position of the lower shell; and then the old components are removed, and the old filter element is removed and collected inside the collecting component;

[0042] Then replace the upper shell with the core replacement component, use the core replacement component to replace the new filter element into the filter, and after completing the filter element replacement, use it for filtering again.

[0043] The beneficial effects of the present invention are as follows:

[0044] 1. In the present invention, filter membranes are arranged on both sides of the core of the filter element, thereby increasing the flux during filtration and improving the filtration efficiency; at the same time, by setting the core body to a concave surface structure, the area of ​​the filter membrane is further increased, thereby further increasing the filtration flux; and the filtered side is arranged in the middle of the two layers of membrane. This arrangement can make the filter membrane fit better with the filter element during the filtration process, avoiding the expansion and deformation of the filter element, which leads to a reduction in the filtration effect.

[0045] 2. In the present invention, when the filter element needs to be replaced, the old filter element is first removed and collected inside the collecting component through the work of the old removal component; before removal, the edge of the collecting box of the collecting component is pressed against the lower shell, and then the lower shell is pushed to slide along the slide groove; and the collecting component is replaced to the position of the lower shell, and then the core shell on the core replacement component is pressed against the edge of the upper shell, and then the upper shell is pushed to slide along the slide groove, and then the position of the upper shell is replaced with the core replacement component, and the new filter element is replaced into the filter using the core replacement component, so that the filter element will not be directly contacted with the old filter element during the replacement process, and the contact with the inside of the filter can be further reduced during the replacement process. The risk of bacterial contamination of the user during the replacement process is thereby increased, thereby improving the cleanliness of the filter replacement process.

[0046] 3. In the present invention, a flexible tube is arranged between the air inlet pipe and the drum. When removing the old filter element, the ejection force increases as the pressure in the channel increases. However, when the old filter element becomes sticky and stuck after a long period of use, the flexible tube can be squeezed by external force to further increase the pressure in the channel, thereby removing the old filter element. At the same time, the arrangement of the flexible tube can also be used as an evaluation indicator of whether the filter element needs to be replaced. As the dirt on the filter membrane increases, the filtering effect decreases, and the pressure in the cavity increases, and the flexible tube will be deformed, so that it can be intuitively observed whether the filter element needs to be replaced.

[0047] 4. In the present invention, since the spiral groove is a spiral structure with a variable pitch, the extrusion plate will move downward more quickly in the initial stage of rotation, thereby enabling faster replacement. When the filter element is close to the installation position, the pitch is reduced, and the distance the extrusion rod moves downward is smaller for the same rotation, thereby enabling a more accurate installation of the new filter element, thereby avoiding the phenomenon of the new filter element being detached due to excessive extrusion of the extrusion rod, thereby improving the accuracy and controllability of the installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The present invention will be further described below in conjunction with the accompanying drawings.

[0049] Figure 1 It is a schematic diagram of the overall structure of the filter in the present invention;

[0050] Figure 2 is a schematic diagram of the first internal structure of the filter in the present invention;

[0051] Figure 3 is a second internal structure schematic diagram of the filter in the present invention;

[0052] Figure 4 It is a schematic diagram of the explosion structure of the filter in the present invention;

[0053] Figure 5 It is a schematic diagram of the filter element when the filter in the present invention is replaced;

[0054] Figure 6 It is a schematic diagram of the internal structure of the filter when the filter element is replaced in the present invention;

[0055] Figure 7 The present invention Figure 2 A partial enlarged view of the middle A;

[0056] Figure 8 It is a schematic diagram of the installation structure of the top rod and the inclined part in the present invention;

[0057] Fig. 9 It is a structural schematic diagram of the middle frame in the present invention;

[0058] Fig.10 It is a schematic diagram of the internal structure of the middle frame in the present invention;

[0059] Fig.11 It is a schematic diagram of the installation structure of the rotary drum in the present invention;

[0060] Fig.12 It is a structural schematic diagram of the rotary drum in the present invention;

[0061] Fig.13 It is a schematic diagram of the internal structure of the core replacement component in the present invention;

[0062] Fig.14 It is a structural schematic diagram of the extrusion rod and the extrusion plate in the present invention;

[0063] In the figure: middle frame 1, filter element 2, core body 3, filter membrane 4, upper shell 5, lower shell 6, slot 7, boss 8, receiving platform 9, ball plunger 10, notch 11, connector 12, support spring 13, channel 14, slide groove 15, return spring 16, inclined portion 17, rotating drum 18, baffle plate No. 19, baffle plate No. 20, through hole 21, gear 22, rack 23, installation box 24, flexible tube 25, one-way valve 26, pressure relief switch 27, groove 28, sealing ring 29, core shell 30, cushion block 31, spiral hole 32, extrusion rod 33, extrusion plate 34, air permeable groove 35, spiral groove 36, guide column 37, collection box 38, magnetic block 39, and push rod 40. DETAILED DESCRIPTION

[0064] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0065] Embodiment 1

[0066] like Figures 1 to 3 As shown, a sterile filter comprises: a middle frame 1;

[0067] The filter element 2 is slidably installed in the middle frame 1 along the vertical direction, and the filter element 2 is hollow; the filter element 2 also includes filter membranes 4 arranged on both sides of the core body 3, and the edges of the filter membranes 4 are sealed and connected to the filter element 2; the upper and lower surfaces of the core body 3 are concave;

[0068] An upper shell 5 and a lower shell 6; the upper shell 5 and the lower shell 6 are installed on the upper and lower sides of the middle frame 1, and form a closed cavity with the middle frame 1;

[0069] An air inlet pipe, one end of which is connected to the cavity, and the other end of which is connected to an external air source device;

[0070] An air outlet pipe; one end of the air outlet pipe passes through the middle frame 1 and communicates with the internal cavity of the filter element 2, and the other end communicates with the external exhaust device.

[0071] When working, the existing filters often use pressure to make the medium to be filtered penetrate from one side to the other side. During filtration, the installation form of the filter membrane is often unilateral, which leads to a small effective filtration flux. Therefore, in this scheme, by arranging filter membranes 4 on both sides of the core 3 of the filter element 2, the filtration flux can be increased, thereby improving the filtration efficiency; at the same time, by arranging the core 3 into a structure with a concave surface, the area of ​​the filter membrane 4 is further increased, thereby further increasing the filtration flux; and the filtered side is arranged in the middle of the two layers of membrane. Such an arrangement can make the filter membrane 4 better fit with the filter element 2 during the filtration process, thereby avoiding the expansion and deformation of the filter element 2, which leads to a reduction in the filtration effect.

[0072] Embodiment 2

[0073] like Figures 4 to 6 As shown, based on the first embodiment, this embodiment further includes that the middle frame 1 is symmetrically provided with card slots 7 on the upper and lower sides; the upper shell 5 and the edge of the card shell are provided with bosses 8;

[0074] The card slot 7 and the boss 8 are slidably installed; the card slot 7 and the boss 8 are tightly matched;

[0075] A receiving platform 9 is provided on both sides of the middle frame 1; a ball plunger 10 is installed on the receiving platform 9; and a notch 11 is provided on the upper shell 5 and the lower shell 6 at a position corresponding to the ball plunger 10;

[0076] like Figure 7 As shown, the filter element 2 also includes a connector 12; the connector 12 is slidably connected to one end of the core body 3 close to the air outlet pipe; the support spring 13 is fixedly connected to one end of the connector away from the air outlet pipe; the other end of the support spring 13 is fixedly connected to the core body 3;

[0077] like Figure 6 and Fig.13 As shown, the core replacement component is used to install a new filter element 2 into the middle frame 1; it includes a core shell 30; a number of filter elements 2 are evenly spaced in the core shell 30; a cushion block 31 is arranged between the filter elements 2; a spiral hole 32 is opened on the upper part of the core shell 30; an extrusion rod 33 is arranged inside the spiral hole 32; the spiral hole 32 is threadedly connected to the extrusion rod 33; the lower part of the extrusion rod 33 is rotatably connected to the extrusion plate 34; the lower surface of the extrusion plate 34 is opened with a ventilation groove 35.

[0078] During operation, the extrusion rod 33 is rotated to move downward, thereby pushing the new filter element 2 in the core shell 30 that contacts the inner wall of the core shell 30 to move downward. After the new filter element 2 moves downward into position, the extrusion rod 33 is rotated in the opposite direction, and then the upper shell 5 is pushed from the side to push the core replacement component out, thereby completing the installation of the new filter element 2.

[0079] Since there is a filter membrane 4 on the filter element 2, it is not convenient to directly press the extrusion plate 34 onto the filter membrane 4. Therefore, an extrusion plate 34 is provided on the extrusion rod 33 to increase the contact area and prevent the filter membrane 4 from being damaged. At the same time, since the core body 3 is a concave structure, after the extrusion plate 34 contacts it, when it is detached, it adsorbs the filter membrane 4 and causes the risk of damage to the filter membrane 4. Therefore, in this solution, a breathable groove 35 is provided on the lower surface of the pressure plate to avoid adsorption during detachment and ensure the integrity of the filter membrane 4. During operation, when replacing the filter element 2 of the existing filter, it is often necessary to remove the outer shell component and then remove the filter element 2 therein. During the removal process, the user needs to directly contact the old filter element 2. This kind of sterile filter is mainly used to filter bacteria and other pathogens when in use. If there is a risk of infection, there will be a risk of infection to personnel. Therefore, in this solution, when it is necessary to replace the filter element 2, the old filter element 2 is first removed and collected into the inside of the collecting component by removing the old component; before removal, the edge of the collecting box 38 of the collecting component is pressed against the lower shell 6, and then the lower shell 6 is pushed to slide along the slide groove 15; and the collecting component is replaced to the position of the lower shell 6, and then the core shell 30 on the core replacement component is pressed against the edge of the upper shell 5, and then the upper shell 5 is pushed to slide along the slide groove 15, and then the position of the upper shell 5 is replaced with the core replacement component, and the new filter element 2 is replaced into the filter by using the core replacement component, so as to achieve that there is no direct contact with the old filter element 2 during the process of replacing the filter element 2, and at the same time, the contact with the inside of the filter can be reduced more during the replacement process. This increases the risk of bacterial contamination to the user during the replacement process, thereby improving the cleanliness of the filter replacement process.

[0080] Since the receiving platform 9 is provided, it can provide support points for the core shell 30 in the core replacement component and the collection box 38 in the collection component when pushing the upper shell 5 and the lower shell 6, thereby facilitating the replacement of the shell and improving the reliability and convenience of operation.

[0081] like Figures 9 to 11 As shown, during operation, when the medium to be filtered needs to be introduced into the cavity, the first baffle 19 and the second baffle 20 are in an overlapping position, which is an open position. When the medium needs to be closed, the rack 23 is pressed to drive the gear 22 to rotate, thereby driving the drum 18 to rotate, so that the first baffle 19 and the second baffle 20 are in a staggered position, and only the edges are partially overlapped, and the cross section of the drum 18 is completely blocked; the position at this time is a closed position;

[0082] When in the closed position, the through hole 21 on the drum coincides with the port position of the channel 14, so that the channel 14 is connected to the inside of the drum 18; at this time, the medium flows into the channel 14, which increases the pressure inside the channel, so that the push rod 40 extends outward, thereby squeezing the inclined portion 17 on the filter element 2. Due to the provision of the inclined portion 17, the force of the push rod 40 on the filter element 2 is partially converted into a force that pushes the filter element 2 vertically downward, and as the pressure inside the channel 14 increases, the connector 12 on the filter element 2 is separated from the middle frame 1, so that the filter element 2 falls downward, and the removal of the old filter element 2 is completed;

[0083] At the same time, by setting a flexible tube 25 corrugated tube or rubber tube between the air intake pipe and the drum 18, when removing the old filter element 2, as the pressure of the channel 14 increases, the ejection force increases. However, when the old filter element 2 becomes stuck after a long period of use, the flexible tube 25 can be squeezed by external force to further increase the pressure in the channel 14, thereby removing the old filter element 2. At the same time, the setting of the flexible tube 25 can also be used as an evaluation indicator of whether the filter element 2 needs to be replaced. As the dirt on the filter membrane 4 increases, its filtering effect decreases, and it is known that the pressure in the cavity increases, and then the flexible tube 25 will be deformed, so that it can be intuitively observed whether the filter element 2 needs to be replaced.

[0084] After the removal is completed, the air pressure in the channel 14 is released by pressing the pressure relief switch 27, and the pressure in the channel 14 is reduced, so that the push rod 40 retracts under the action of the return spring 16, thereby facilitating the subsequent installation of the new filter element 2.

[0085] At the same time, in order to ensure the stability of the filter element 2 after being installed in the middle frame 1, the connector 12 is a square structure, and a limit block is set on one side of the core body 3, and a limit strip is correspondingly set on the inner side of the middle frame. After the filter element 2 is installed, the rotation of the filter element 2 can be effectively limited.

[0086] The old removal component is used to remove the used filter element 2 to be replaced from the middle frame 1; it includes a channel 14 opened in the middle frame 1; both ends of the channel 14 are located at the air inlet end; a slide groove 15 is symmetrically opened on the inner side of the middle frame 1; the slide groove 15 is connected to the channel 14; a push rod 40 is slidably connected in the slide groove 15; one end of the push rod 40 is fixedly connected to a reset tension spring, and the other end of the reset tension spring is fixedly connected to the bottom of the slide groove 15;

[0087] A regulating component for regulating the flow direction of an external gas source is provided between the middle frame 1 and the air inlet pipe; the flow direction of the gas source includes either flowing into the cavity or flowing into the channel 14;

[0088] Inclined portions 17 are symmetrically provided on both sides of the filter element 2 ; the other end of the push rod 40 abuts against the inclined portion 17 .

[0089] like Figures 8 to 9 As shown, the adjustment assembly includes a rotating drum 18 rotatably connected to the middle frame 1; the middle frame 1 is fixedly connected to a first baffle 19 on one side of the rotating drum 18; the first baffles 19 are evenly spaced and distributed in a fan shape; a second baffle 20 is fixedly connected to a side of the rotating drum 18 close to the first baffle 19; the first baffle 19 is in conflict with the second baffle 20; the second baffle 20 and the first baffle 19 can completely block the cross section of the rotating drum 18;

[0090] like Fig.12 As shown, through holes 21 are symmetrically opened on the side of the rotating drum 18; a mounting box 24 is fixedly connected to the outside of the middle frame 1; a rack 23 is slidably connected to the mounting box 24; a gear 22 is fixedly connected to the rotating drum 18; the gear 22 meshes with the rack 23;

[0091] A flexible tube 25 is fixedly connected to one end of the rotating drum 18 away from the middle frame 1; a one-way valve 26 is fixedly installed to one end of the flexible tube 25 away from the rotating drum 18, and the other end of the one-way valve 26 is connected to the air intake pipe;

[0092] A pressure relief switch 27 is installed on one side of the middle frame 1 ; the pressure relief switch 27 is connected to the inside of the channel 14 .

[0093] Collecting component; the collecting component is used to collect the filter element 2 from which the old components have been removed; the collecting component includes a collecting box 38; a magnetic block 39 is fixedly provided inside the collecting box 38; the pad 31 on the filter element 2 is made of magnetic rubber; an electrostatic adsorption film is attached to the inner surface of the collecting box 38.

[0094] During operation, since a pad 31 made of magnetic rubber is provided on the lower surface of the filter element 2, when the used filter element 2 is removed, when the old filter element 2 falls off and falls into the collection box 38, the old filter element 2 is adsorbed by the magnetic block 39, and the old filter element 2 placed inside will jump out or shake during the removal of the collection box 38. At the same time, by providing an electrostatic adsorption film inside the mobile phone box, the dust scattered on the filter element 2 during the removal process is adsorbed onto the electrostatic adsorption film through the effect of electrostatic adsorption, thereby avoiding the spread of dust and bacteria, thereby improving the cleanliness of the filter element 2 during replacement.

[0095] Among them, electrostatic adsorption membrane is a membrane material that uses electrostatic effect to improve filtration or separation efficiency. It applies electric charge on the membrane surface or selects charged materials, so that the target particles or microorganisms interact with the membrane due to electrostatic attraction, and are captured and removed. Common ones include polyester fiber membrane, polypropylene fiber membrane and polytetrafluoroethylene (PTFE) membrane.

[0096] Embodiment 3

[0097] like Fig.12As shown, on the basis of the second embodiment, this embodiment further provides the following features: a groove 28 is provided on the side of the second baffle plate 20 close to the first baffle plate 19; a sealing ring 29 is embedded in the groove 28; the sealing ring 29 is a hollow structure; the sealing ring 29 is filled with a gas medium, and the wall thickness of the sealing ring 29 close to the first baffle plate is thickened.

[0098] During operation, by arranging a sealing ring 29 between the No. 1 baffle 19 and the No. 2 baffle 20, in the process of blocking the entrance, as the pressure in the channel 14 increases, the No. 2 baffle 20 gradually squeezes the sealing ring 29, so that the sealing of the contact position between the No. 1 baffle 19 and the No. 2 baffle 20 can be increased; at the same time, by arranging the sealing ring 29 into a hollow form, when the No. 1 baffle 19 and the No. 2 baffle 20 are squeezed against each other, the sealing ring is more easily deformed, thereby forming a deformed sealing structure at the edge where the No. 1 baffle 19 and the No. 2 baffle 20 contact, and in the design, the edges of the No. 1 baffle 19 and the No. 2 baffle 20 can be made closer when they are rotated to the closed position, so that the flow cross-sectional area in the open position can be increased, thereby ensuring the flux of the filter.

[0099] Embodiment 4

[0100] like Fig.14 As shown, based on the second embodiment, this embodiment further provides the following features: a guide column 37 is fixedly connected to the inside of the spiral hole 32; a spiral groove 36 is opened on the extrusion rod 33; the spiral groove 36 is slidably connected to the guide column 37; the pitch of the spiral groove 36 gradually decreases from bottom to top.

[0101] During operation, when the extrusion rod 33 is rotated, the spiral groove 36 on the extrusion rod 33 is slidably connected with the guide column 37, which will force the extrusion rod 33 to move axially. As the rotation proceeds, it will be squeezed toward the filter element 2 in the core shell 30, so that the filter element 2 gradually moves toward the installation position, and finally the connector 12 enters the position of the air outlet, thereby realizing the installation of the new filter element 2; since the spiral groove 36 is a spiral structure with a variable pitch, the extrusion plate 34 will move downward more quickly at the beginning of the rotation, so that faster replacement can be achieved. When the filter element 2 is approaching the installation position, the distance moved downward by the extrusion rod 33 in the same rotation will be smaller due to the reduction in pitch, so that the new filter element 2 can be installed in place more accurately, avoiding the phenomenon that the new filter element 2 is detached due to excessive squeezing of the extrusion rod 33, thereby improving the accuracy and controllability of the installation.

[0102] The present invention also discloses a filtration method of a sterile filter, comprising the following steps:

[0103] S1: Install the filter element 2, open the upper housing 5 of the filter, then place the filter element 2 horizontally in the middle frame 1, press the upper edge of the filter element 2, push the filter element 2 until the connector 12 on the filter element 2 is connected to the air outlet pipe at one end of the middle frame 1, and then close the upper housing 5;

[0104] S2: Preliminary filtration test: connect the air inlet pipe of the filter to the external air source, then place the detection head of the detector at the outlet pipe end of the filter for detection, and judge whether it is qualified according to the test results;

[0105] If qualified, proceed to the next step; if unqualified, reinstall the filter element 2;

[0106] S3: Filtration: connect the air outlet pipe of the filter to the external exhaust device for filtering;

[0107] S4: Replace the filter element 2; determine whether to replace the filter element 2 by observing the state of the flexible tube 25; if necessary;

[0108] First, the edge of the collecting box 38 of the collecting component is pressed against the lower housing 6, and then the lower housing 6 is pushed to slide along the slide groove 15; and the collecting component is replaced to the position of the lower housing 6; and then the old component is removed, and the old filter element 2 is removed and collected inside the collecting component;

[0109] Then, the upper shell 5 is replaced with a core-changing component, and a new filter element 2 is replaced into the filter using the core-changing component. After the filter element 2 is replaced, it can be used for filtering again.

[0110] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A sterile filter, characterized in that: include; Middle frame (1); A filter element (2), the filter element (2) being slidably mounted in the middle frame (1) in a vertical direction, the filter element (2) being hollow; the filter element (2) further comprising filter membranes (4) arranged on both sides of the core body (3), the edges of the filter membranes (4) being sealed and connected to the filter element (2); the upper and lower surfaces of the core body (3) being concave; An upper shell (5) and a lower shell (6), wherein the upper shell (5) and the lower shell (6) are mounted on upper and lower sides of the middle frame (1) and form a closed cavity with the middle frame (1); An air inlet pipe, one end of which is connected to the cavity, and the other end of which is connected to an external air source device; An air outlet pipe, one end of which passes through the middle frame (1) and is connected to the internal cavity of the filter element (2), and the other end of which is connected to an external exhaust device; The middle frame (1) is symmetrically provided with card slots (7) on the upper and lower sides; the upper shell (5) and the card shell are provided with bosses (8) at their edges; the card slots (7) and the bosses (8) are slidably mounted, and the card slots (7) and the bosses (8) are tightly fitted; A receiving platform (9) is provided on both sides of the middle frame (1); a ball plunger (10) is mounted on the receiving platform (9); and notches (11) are provided on the upper shell (5) and the lower shell (6) at positions corresponding to the ball plunger (10); The filter element (2) further comprises a connector (12); an end of the core body (3) close to the air outlet pipe is slidably connected to the connector (12); an end of the connector (12) away from the air outlet pipe is fixedly connected to a support spring (13); the other end of the support spring (13) is fixedly connected to the core body (3); A core replacement component, the core replacement component is used to install the new filter element (2) into the middle frame (1); A de-used component, used to remove a used filter element (2) to be replaced from the middle frame (1); A collecting component; the collecting component is used to collect the filter element (2) removed from the old removal component; The old-gas removal component comprises a channel (14) provided in the middle frame (1); both ends of the channel (14) are located at the air inlet end; a slide groove (15) is symmetrically provided on the inner side of the middle frame (1); the slide groove (15) is connected to the channel (14); a push rod (40) is slidably connected in the slide groove (15); one end of the push rod (40) is fixedly connected to a reset spring, and the other end of the reset spring is fixedly connected to the bottom of the slide groove (15); A regulating component for regulating the flow direction of an external air source is provided between the middle frame (1) and the air inlet pipe; the flow direction of the air source includes either flowing into the cavity or flowing into the channel (14); Inclined portions (17) are symmetrically arranged on both sides of the filter element (2); the other end of the push rod (40) abuts against the inclined portion (17). The adjustment assembly comprises a rotating drum (18) rotatably connected to the middle frame (1); a first baffle (19) is fixedly connected to one side of the rotating drum (18) located on the middle frame (1); the first baffles (19) are evenly spaced and distributed in a fan-shaped manner; a second baffle (20) is fixedly connected to one side of the rotating drum (18) close to the first baffle (19); the first baffle (19) is in conflict with the second baffle (20); the second baffle (20) and the first baffle (19) can completely block the cross section of the rotating drum (18); The side surface of the rotating drum (18) is symmetrically provided with through holes (21); the outside of the middle frame (1) is fixedly connected to a mounting box (24); a rack (23) is slidably connected to the mounting box (24); a gear (22) is fixedly connected to the rotating drum (18); the gear (22) meshes with the rack (23); One end of the rotating drum (18) away from the middle frame (1) is fixedly connected to a flexible tube (25); one end of the flexible tube (25) away from the rotating drum (18) is fixedly installed with a one-way valve (26), and the other end of the one-way valve (26) is connected to the air intake pipe; A pressure relief switch (27) is installed on one side of the middle frame (1); the pressure relief switch (27) is connected to the interior of the channel (14).

2. A sterile filter according to claim 1, characterized in that: A groove (28) is provided on a side of the second baffle plate (20) close to the first baffle plate (19); a sealing ring (29) is embedded in the groove (28); the sealing ring (29) is a hollow structure; a gas medium is filled inside the sealing ring (29), and the wall thickness of the sealing ring (29) close to the first baffle plate (19) is thickened.

3. A sterile filter according to claim 2, characterized in that: The core replacement component comprises a core shell (30); a plurality of filter cores (2) are evenly spaced within the core shell (30); a cushion block (31) is disposed between the filter cores (2); a spiral hole (32) is provided at the top of the core shell (30); an extrusion rod (33) is provided inside the spiral hole (32); the spiral hole (32) is threadedly connected to the extrusion rod (33); an extrusion plate (34) is rotatably connected to the bottom of the extrusion rod (33); and a ventilation groove (35) is provided on the bottom surface of the extrusion plate (34).

4. A sterile filter according to claim 3, characterized in that: A guide column (37) is fixedly connected inside the spiral hole (32); a spiral groove (36) is provided on the extrusion rod (33); the spiral groove (36) is slidably connected to the guide column (37); and the pitch of the spiral groove (36) gradually decreases from bottom to top.

5. A sterile filter according to claim 4, characterized in that: The collecting component comprises a collecting box (38); a magnetic block (39) is fixedly arranged inside the collecting box (38); the upper pad (31) of the filter element (2) is made of magnetic rubber; and an electrostatic adsorption film is attached to the inner surface of the collecting box (38).

6. A filtration method for a sterile filter, applicable to the filter according to any one of claims 4 to 5, characterized in that: The steps include: S1: Install the filter element (2), open the upper housing (5) of the filter, then place the filter element (2) horizontally in the middle frame (1), press the upper edge of the filter element (2), push the filter element (2) until the connector (12) on the filter element (2) is connected to the air outlet pipe at one end of the middle frame (1), and then close the upper housing (5); S2: Preliminary filtration test: connect the air inlet pipe of the filter to the external air source, then place the detection head of the detector at the outlet pipe end of the filter for detection, and judge whether it is qualified according to the test results; If qualified, proceed to the next step; if unqualified, reinstall the filter element (2); S3: Filtration: connect the air outlet pipe of the filter to the external exhaust device for filtering; S4: replacing the filter element (2); judging whether the filter element (2) needs to be replaced by observing the state of the flexible tube (25); if replacement is required; First, the edge of the collecting box (38) of the collecting component is pressed against the lower shell (6), and then the lower shell (6) is pushed to slide along the slide groove (15); The collecting component is replaced to the position of the lower housing (6); and then the old components are removed, the old filter element (2) is removed and collected inside the collecting component; The upper shell (5) is then replaced with a core replacement component, and a new filter element (2) is replaced into the filter using the core replacement component. After the filter element (2) is replaced, the filter is used again for filtering.

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