Medical filter press diaphragm plate

Abstract

The application relates to the technical field of medical filtration, and discloses a medical filter press diaphragm plate which comprises a core plate, an elastic diaphragm and a sealing assembly; the core plate and the elastic diaphragm are connected in an integrated mode through a hot melting process; the sealing assembly is embeddedly installed at the edge of the core plate; an extrusion chamber is arranged on the filtering working surface of the core plate; the extrusion chamber is arranged in an arc shape; an arc-shaped extrusion boss is fixedly connected in the extrusion chamber; a pressing protrusion is fixedly connected to one side of the elastic diaphragm which faces the core plate; a pushing-out assembly is fixedly connected to the outer side of the core plate; the sealing assembly comprises a connecting sealing groove and a sealing boss which is embeddedly matched with the connecting sealing groove; the connecting sealing groove is arranged on the end face edge of the core plate; and the sealing boss is fixedly connected to the outer side of the elastic diaphragm. The medical filter press diaphragm plate has the advantages of reliable sealing and leakage prevention, no health dead angle, efficient online cleaning, effective prevention of drug cross contamination and the like.

Description

Technical Field

[0001] This invention relates to the field of pharmaceutical filtration technology, specifically to a diaphragm plate for a medical filter press. Background Technology

[0002] In the pharmaceutical and biological agent production field, solid-liquid separation is the core process for achieving drug purification and filter cake dehydration, which directly determines the purity of drugs, production safety and compliance. As a key piece of equipment in this process, the filter press must strictly meet the stringent requirements of the Good Manufacturing Practice (GMP) for aseptic, non-precipitation, easy cleaning and high-temperature sterilization, in terms of the structural design, hygiene performance and pressing efficiency of its core functional component, the diaphragm plate. At the same time, it must be adapted to the special separation conditions of viscous pharmaceutical materials such as mycelium and protein precipitates.

[0003] Currently, most mainstream filter press diaphragm plates on the market are modified from general industrial-grade products. Some adopt a structure combining elastic air bladders and rigid frames. Although they can achieve basic pressing functions, they have many inherent defects in medical and health applications: First, the structure mostly uses external air nozzles, welded edge sealing, or embedded frame combinations. The air path and flow channel have right-angle corners and splicing gaps, forming cleaning dead zones. It is impossible to thoroughly remove residual materials and microorganisms through CIP online cleaning and SIP high-temperature sterilization, which can easily lead to cross-contamination of drugs. Second, the pressing structure is a planar air bladder inflated or uniform cylindrical support, resulting in uneven pressing pressure distribution. This leads to high moisture content at the edge of the filter cake and overpressure in the center. Moreover, the repeated deformation at the junction of the membrane and rigid components makes it easy to tear, resulting in a short service life. Third, the sealing structure is simple, relying only on planar compression sealing. Under high pressure conditions, gaps and leaks are easy to occur. At the same time, the flow channel is a single straight-line design, which is easy to clog when dealing with viscous materials, and the sludge removal is difficult. Therefore, a medical filter press diaphragm plate is proposed to solve the above problems. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a medical filter press diaphragm plate that offers advantages such as reliable sealing against leakage, no unsanitary corners, efficient online cleaning, and effective prevention of cross-contamination of pharmaceuticals. It solves several problems: First, many existing technologies use external air nozzles, welded edge sealing, or embedded frame combinations, resulting in right-angle corners and seams in the air path and flow channel, creating cleaning dead zones that cannot be thoroughly removed by CIP online cleaning and SIP high-temperature sterilization, easily leading to cross-contamination of pharmaceuticals. Second, the pressing structure uses planar air bladder inflation or uniform cylindrical support, resulting in uneven pressing pressure distribution, leading to high moisture content at the filter cake edges and overpressure in the center. Furthermore, repeated deformation at the junction of the membrane and rigid components makes it prone to tearing, resulting in a short service life. Third, the sealing structure is simple, relying solely on planar compression for sealing, which easily leads to gap leakage under high-pressure conditions. Additionally, the flow channel is a single straight-line design, making it prone to clogging when dealing with viscous materials and difficult to clean.

[0006] (II) Technical Solution

[0007] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a diaphragm plate for a medical filter press, comprising a core plate, an elastic membrane, and a sealing assembly; the core plate and the elastic membrane are integrally formed and connected by a hot-melt process, and the sealing assembly is fitted and installed at the edge of the core plate; the filter working surface of the core plate has a squeezing chamber, the squeezing chamber is arc-shaped, an arc-shaped squeezing protrusion is fixedly connected inside the squeezing chamber, a pressing protrusion is fixedly connected to the side of the elastic membrane facing the core plate, and an ejection assembly is fixedly connected to the outer side of the core plate; The sealing assembly includes a connecting sealing groove and a sealing boss that fits into the connecting sealing groove. The connecting sealing groove is opened at the edge of the end face of the core plate, and the sealing boss is fixedly connected to the outside of the elastic diaphragm. The sealing boss is tightly embedded inside the connecting sealing groove.

[0008] The beneficial effects of this invention are: 1) The diaphragm plate of this medical filter press has the advantages of reliable sealing and leak prevention, no dead corners for hygiene, efficient online cleaning, and effective prevention of cross-contamination of medicines.

[0009] 2) The diaphragm plate of this medical filter press has the advantages of uniform and efficient pressing, sufficient dehydration of filter cake, easy peeling of viscous materials, and lower production energy consumption.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, the ejection assembly includes an ejection box, an ejection spring, an ejection rod, an ejection groove, and an ejection plate. The ejection box is fixedly connected to the outside of the core plate, the ejection spring is fixedly connected to the inside of the ejection box, the ejection rod is fixedly connected to the other end of the ejection spring and extends to the outside of the ejection box, the ejection plate is fixedly connected to the end of the ejection rod located on the outside of the ejection box, and the ejection groove is formed on the outside of the ejection box.

[0012] Furthermore, the number of ejection components is four, and the four ejection components are distributed in a rectangular array on the outside of the core plate. The number of ejection rods is multiple, the cross-sectional shape of the ejection plate is adapted to the cross-sectional shape of the ejection groove, and the ejection rod is T-shaped.

[0013] Furthermore, the elastic diaphragm extends through and to the outer side of the core plate through a limiting ring sleeve, and there are four limiting ring sleeves. The end face of the elastic diaphragm is provided with a connecting groove, and two of the limiting ring sleeves are provided with connecting holes that communicate with the connecting groove.

[0014] Furthermore, an air inlet groove is provided on the outer side of the core plate, an air inlet hole communicating with the air inlet groove is provided on the outer side of the arc-shaped extrusion boss, the extrusion chamber is connected to the air inlet groove through the air inlet hole, and multiple through holes are provided on the outer side of the core plate.

[0015] Furthermore, a pulling block is fixedly connected to the outer side of the core plate. The core plate is based on medical-grade reinforced polypropylene. Antibacterial modified components and anti-exudation lubricating modified components are added to the interior of the base material. The inner side of the extrusion chamber, the inner wall of the air inlet groove, and the inner wall of the air inlet hole of the core plate are all polished.

[0016] Furthermore, the depth of the extrusion chamber is 8mm-12mm; the height of the pressing protrusion is less than the depth of the extrusion chamber channel; there are multiple pressing protrusions, which are evenly distributed on the side of the elastic diaphragm facing the core plate.

[0017] Furthermore, the connecting sealing groove is a double-layer sealing groove, which is divided into an inner sealing groove and an outer sealing groove arranged coaxially; the inner sealing groove has a depth of 4.5-5.5mm and a width of 7.5-8.5mm, and the outer sealing groove has a depth of 3.5-4.5mm and a width of 5.5-65mm. The surface of the sealing boss is processed with anti-slip interlocking texture, which is a mesh or strip-shaped concave-convex structure.

[0018] Furthermore, the elastic diaphragm is molded from medical-grade hydrogenated nitrile rubber, and the overall thickness of the elastic diaphragm is 3mm-5mm; a 0.1mm-0.2mm thick polytetrafluoroethylene coating is bonded to the outer surface of the elastic diaphragm away from the core plate.

[0019] Furthermore, there are two elastic diaphragms, which are symmetrically distributed on the outer side of the core plate, and a connecting ring groove is formed on the outer side of the elastic diaphragm. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial cross-sectional view of the structure of the present invention; Figure 3 This is a schematic diagram of the core board structure of the present invention; Figure 4 This is a schematic diagram of the elastic diaphragm structure of the present invention; Figure 5 This is a connection diagram of the ejector rod and ejector plate of the present invention; Figure 6 This is a diagram showing the connection between the spring and the ejector rod of the present invention.

[0021] In the diagram: 1. Core plate; 2. Elastic diaphragm; 3. Sealing assembly; 31. Connecting sealing groove; 32. Sealing boss; 4. Extrusion chamber; 5. Arc-shaped extrusion boss; 6. Pressing protrusion; 7. Ejection assembly; 71. Ejection box; 72. Ejection spring; 73. Ejection rod; 74. Ejection groove; 75. Ejection plate; 8. Limiting ring sleeve; 9. Connecting groove; 10. Connecting hole; 11. Air inlet groove; 12. Air inlet; 13. Connecting ring groove; 14. Through hole; 15. Pulling block. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1, by Figure 1-4 A diaphragm plate for a medical filter press is provided. The invention includes a core plate 1, an elastic diaphragm 2, and a sealing assembly 3. The core plate 1 and the elastic diaphragm 2 are integrally formed and connected by a hot-melt process. The sealing assembly 3 is fitted and installed at the edge of the core plate 1. The filter working surface of the core plate 1 has a squeezing chamber 4, which is arc-shaped. An arc-shaped squeezing protrusion 5 is fixedly connected inside the squeezing chamber 4. A squeezing protrusion 6 is fixedly connected to the side of the elastic diaphragm 2 facing the core plate 1. An ejection assembly 7 is fixedly connected to the outer side of the core plate 1. The sealing assembly 3 includes a connecting sealing groove 31 and a sealing boss 32 that fits into the connecting sealing groove 31. The connecting sealing groove 31 is opened at the edge of the end face of the core plate 1, and the sealing boss 32 is fixedly connected to the outside of the elastic diaphragm 2. The sealing boss 32 is tightly fitted inside the connecting sealing groove 31.

[0024] Among them, the core board 1 and the elastic diaphragm 2 are integrally formed by hot melting with a bonding strength of ≥5MPa, the bonding interface is free from leakage and cracking, and the diaphragm and core board do not separate during long-term operation.

[0025] This application achieves an integral molding connection between the core plate 1 and the elastic diaphragm 2 through a hot-melt process. Compared with the traditional spliced ​​structure, this significantly improves the connection strength and sealing reliability of the two, effectively avoiding material leakage caused by loose connection during high-pressure pressing. The matching design of the arc-shaped extrusion chamber 4 and the arc-shaped extrusion boss 5 changes the force distribution mode of the traditional planar pressing, making the pressure distribution more uniform and significantly improving the dewatering efficiency and uniformity of the filter cake. The interlocking installation structure of the sealing component 3 ensures the sealing performance of the entire diaphragm plate edge, adapting to the high-pressure and high-cleanliness operating conditions of medical filter presses.

[0026] In this embodiment, an air inlet groove 11 is provided on the outer side of the core plate 1, and an air inlet hole 12 communicating with the air inlet groove 11 is provided on the outer side of the arc-shaped extrusion boss 5. The extrusion chamber 4 is connected to the air inlet groove 11 through the air inlet hole 12, and multiple through holes 14 are provided on the outer side of the core plate 1.

[0027] The interconnected design of the air inlet groove 11 and the air inlet hole 12 forms an integrated air path from the outside of the core plate 1 to the extrusion chamber 4, ensuring the stability of the gas delivery of the pressing medium and the efficiency of pressure transmission. The air inlet hole 12 on the outside of the arc-shaped extrusion boss 5 is directly connected to the extrusion chamber 4, which can realize rapid and uniform air supply to the extrusion chamber 4, ensuring that the elastic diaphragm 2 can quickly respond to changes in air pressure during the pressing process, improving the response speed and pressing efficiency of the pressing action. The multiple through holes 14 on the outside of the core plate 1 not only meet the flow requirements of the filtrate and ensure the smooth discharge of liquid during the filtration process, but also allow the residual gas in the extrusion chamber 4 to be discharged in time during the pressing process, avoiding the problem of uneven pressing caused by gas retention, and further improving the dehydration effect of the filter cake.

[0028] Meanwhile, a pulling block 15 is fixedly connected to the outside of the core plate 1. The core plate 1 is integrally prepared by a twin-screw co-extrusion melt molding process. After molding, the core plate 1 is free of bubbles, delamination, and gaps. The core plate 1 is based on medical-grade reinforced polypropylene. The core plate 1 is compounded with antibacterial modified components and anti-exudation lubricating modified components. The antibacterial modified component is nano-titanium dioxide antibacterial agent, which accounts for 0.5%-1.2% of the mass of the core plate core plate. The anti-exudation lubricating modified component is polytetrafluoroethylene micro powder modifier, which accounts for 0.3%-0.8% of the mass of the core plate 1 core plate. The two modified components are uniformly dispersed in the core plate, without agglomeration or material exudation. The antibacterial rate achieved by the nano-titanium dioxide antibacterial agent in the core plate 1 is not less than 99.2%. When the diaphragm plate comes into contact with pharmaceutical raw materials, the amount of harmful substances released is less than 0.01 mg / kg, which fully complies with GMP specifications and FDA 21 CFR 177.2600 standards. The antibacterial modified components added to the substrate can effectively inhibit the growth of microorganisms such as bacteria and mold, avoiding the risk of microbial contamination of materials and fully complying with the hygiene and safety standards of medical production. The addition of anti-exudation lubricating modified components improves the lubricity of the core plate 1 surface, reduces the frictional loss between the elastic diaphragm 2 and the core plate 1, and avoids secondary contamination of materials caused by the exudation of modified components, ensuring the safety and cleanliness of medical production.

[0029] The inner side of the extrusion chamber 4, the inner wall of the air inlet groove 11, and the inner wall of the air inlet hole 12 of the core plate 1 are all polished. After polishing, the roughness Ra of all surfaces of the core plate 1 that come into contact with the material is ≤0.8μm. The surface is free of scratches, pits, and right-angle corners, completely eliminating dead corners for cleaning. Combined with the CIP online cleaning system, it can achieve rapid cleaning without residue. The cleaning efficiency is 60% higher than that of the traditional structure, reducing the risk of cross-contamination and further improving the hygiene safety and reliability of the diaphragm plate. It provides a solid guarantee for the compliant operation of medical pressure filtration equipment.

[0030] In this embodiment, the elastic diaphragm 2 is molded from medical-grade hydrogenated nitrile rubber, and the overall thickness of the elastic diaphragm 2 is 3mm-5mm. A 0.1mm-0.2mm thick polytetrafluoroethylene coating is bonded to the outer surface of the elastic diaphragm 2 away from the core plate 1. The coating is firmly bonded to the diaphragm body without peeling or wrinkling. The polytetrafluoroethylene coating on the surface of the elastic diaphragm 2 can reduce the adhesion of viscous materials. After the diaphragm plate is pressed, the moisture content of the filter cake is ≤30%, the peeling rate of the filter cake of biopharmaceutical viscous materials is ≥99%, and the uniformity of the pressing pressure distribution is improved by more than 35% compared with the traditional structure.

[0031] In the second embodiment, the outer side of the elastic diaphragm 2 extends through and to the outer side of the core plate 1 through a limiting ring 8. There are four limiting rings 8. The end face of the elastic diaphragm 2 is provided with a connecting groove 9. Two of the limiting rings 8 are provided with connecting holes 10 that communicate with the connecting groove 9 on their outer sides.

[0032] The limiting ring 8 penetrates the elastic diaphragm 2 and extends to the outside of the core plate 1, providing all-round positioning and limiting for the elastic diaphragm 2 and the core plate 1. This effectively avoids displacement, warping, or overturning of the elastic diaphragm 2 during high-pressure pressing, ensuring the stability of the overall diaphragm plate structure and the consistency of the pressing action. It also allows for easy insertion of external limiting rods, facilitating the entire filtration pressing operation. The connecting groove 9 on the end face of the elastic diaphragm 2 is connected to the connecting hole 10 on the outside of the limiting ring 8, forming a complete fluid flow channel. This ensures the smooth flow of pressing media such as gas and liquid, avoiding insufficient pressing pressure due to channel blockage or poor connection, and ensuring the stability of the pressing effect.

[0033] The depth of the extrusion chamber 4 is 8mm-12mm; the height of the extrusion protrusion 6 is less than the depth of the extrusion chamber channel 4, and the height difference between the two is 1mm. There are multiple extrusion protrusions 6, which are evenly distributed on the side of the elastic diaphragm 2 facing the core plate 1.

[0034] The height of the pressing protrusion 6 is less than the depth of the extrusion chamber 4, which provides sufficient space for the elastic deformation of the elastic diaphragm 2 and avoids rigid collision between the pressing protrusion 6 and the bottom of the extrusion chamber 4 during the pressing process. This effectively protects the structural integrity of the elastic diaphragm 2 and the core plate 1 and extends their service life. The multiple evenly distributed pressing protrusions 6 disperse the overall pressing force into multiple local pressure points, making the pressure distribution more uniform. Compared with the traditional flat pressing structure without protrusions, this significantly improves the dehydration uniformity and dehydration efficiency of the filter cake. Especially for medical materials with high viscosity, it can effectively overcome the surface tension of the material and achieve more thorough dehydration.

[0035] In Example 3, the connecting sealing groove 31 is a double-layer sealing groove, which is divided into an inner sealing groove and an outer sealing groove arranged coaxially. The inner sealing groove has a depth of 4.5-5.5mm and a width of 7.5-8.5mm, while the outer sealing groove has a depth of 3.5-4.5mm and a width of 5.5-65mm. The inner and outer sealing grooves form a stepped nested sealing structure, which can resist leakage due to pressure fluctuations during the pressing process. The surface of the sealing boss 32 is processed with anti-slip interlocking texture, which is a mesh or strip-shaped concave-convex structure.

[0036] This implementation employs a coaxially arranged double-layer connecting sealing groove 31 and a matching sealing boss 32 to form an inner and outer double sealing barrier. The inner and outer sealing grooves are layered and pressure-bearing for sealing, which greatly improves the sealing reliability of the core plate 1 and the elastic diaphragm 2 under high pressure conditions. The mesh or strip-shaped anti-slip interlocking texture on the surface of the sealing boss 32 significantly enhances the tightness of the fit between the sealing boss 32 and the connecting sealing groove 31, effectively preventing the sealing components from slipping, loosening, and dislodging. Structurally, it completely eliminates the problems of drug leakage, microbial invasion, and cross-contamination of materials under high pressure, fully meeting the sterile and leak-free sealing requirements of medical and sanitary grade filter press equipment.

[0037] In this embodiment, there are two elastic diaphragms 2, which are symmetrically distributed on the outer side of the core plate 1. The double-sided synchronous pressing is achieved by using the double-sided symmetrically distributed elastic diaphragms 2, which effectively improves the pressure filtration efficiency per unit time. A connecting ring groove 13 is provided on the outer side of the elastic diaphragm 2, and a sealing ring can be fitted inside the connecting ring groove 13 to improve the overall sealing effect.

[0038] Example 4, by Figure 5-6Based on the above three embodiments, an ejection assembly 7 is added. The ejection assembly 7 includes an ejection box 71, an ejection spring 72, an ejection rod 73, an ejection groove 74, and an ejection plate 75. The ejection box 71 is fixedly connected to the outside of the core plate 1, the ejection spring 72 is fixedly connected to the inside of the ejection box 71, the ejection rod 73 is fixedly connected to the other end of the ejection spring 72 and extends to the outside of the ejection box 71, the ejection plate 75 is fixedly connected to the end of the ejection rod 73 located on the outside of the ejection box 71, and the ejection groove 74 is opened on the outside of the ejection box 71. There are four ejection components 7, which are arranged in a rectangular array on the outside of the core plate 1. There are multiple ejection rods 73. The cross-sectional shape of the ejection plate 75 is adapted to the cross-sectional shape of the ejection groove 74. The ejection rods 73 are T-shaped.

[0039] Automatic unloading of filter cake is achieved by using the elastically driven ejector component 7, which requires no external power. The structure is simple and the operation is stable. It can effectively prevent the filter cake from sticking to the elastic membrane 2, simplify the unloading operation process, and improve the cleanliness and production efficiency of pharmaceutical pressure filtration.

[0040] Working principle: When the diaphragm plate of this medical filter press is working, the medical material to be filtered enters the filter chamber formed by the elastic membranes 2 symmetrically distributed on both sides of the core plate 1. The filtrate in the material is first quickly discharged through the through holes 14 on the core plate 1 to complete the initial solid-liquid separation. Then, the pressing medium is evenly introduced into the arc-shaped pressing chamber 4 through the air inlet groove 11 of the core plate 1 and the air inlet holes 12 on the arc-shaped pressing protrusion 5, pushing the elastic membrane 2 to expand and deform smoothly towards the material side. The pressing protrusions 6 evenly distributed on the elastic membrane 2, together with the arc-shaped pressing chamber 4 and the arc-shaped pressing protrusion 5, achieve a uniform distribution of pressing pressure throughout the entire range, and fully dehydrate and press the filter cake. During this process, the double-layer connecting sealing groove 31 and the sealing protrusion 32 at the edge of the core plate 1 and the elastic membrane 2 are protected by anti-slip bite. The tightly interlocking textures form a double sealing barrier, preventing leakage of the medicine and invasion of microorganisms under high pressure. The limiting ring 8 ensures that the elastic membrane 2 is accurately positioned and does not shift when deformed. After the pressing is completed and the pressure is released, the push-out components 7 distributed in a rectangular array on the outside of the core plate 1 drive the push-out rod 73 and the push-out plate 75 to move synchronously through the push-out spring 72, completely peeling the filter cake off the polytetrafluoroethylene coating on the surface of the elastic membrane 2. At the same time, the core plate 1 uses a medical-grade antibacterial and anti-exudation substrate, and the inner walls of the extrusion chamber 4, air inlet groove 11, and air inlet hole 12 are all polished. With the integrated structure design without dead corners, it can successfully complete CIP online cleaning and SIP high-temperature sterilization, achieving sterile, cross-contamination-free, efficient and uniform pressure filtration and dehydration of pharmaceutical materials throughout the entire process.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A diaphragm plate for a medical filter press, characterized in that: The system includes a core plate (1), an elastic diaphragm (2), and a sealing assembly (3). The core plate (1) and the elastic diaphragm (2) are integrally formed and connected by a hot-melt process. The sealing assembly (3) is fitted and installed at the edge of the core plate (1). The filter working surface of the core plate (1) is provided with a squeezing chamber (4). The squeezing chamber (4) is arranged in an arc shape. An arc-shaped squeezing protrusion (5) is fixedly connected inside the squeezing chamber (4). A pressing protrusion (6) is fixedly connected to the side of the elastic diaphragm (2) facing the core plate (1). An ejection assembly (7) is fixedly connected to the outside of the core plate (1). The sealing assembly (3) includes a connecting sealing groove (31) and a sealing boss (32) that fits into the connecting sealing groove (31). The connecting sealing groove (31) is opened at the edge of the end face of the core plate (1). The sealing boss (32) is fixedly connected to the outside of the elastic diaphragm (2). The sealing boss (32) is tightly fitted inside the connecting sealing groove (31).

2. The diaphragm plate for a medical filter press according to claim 1, characterized in that: The ejection assembly (7) includes an ejection box (71), an ejection spring (72), an ejection rod (73), an ejection groove (74), and an ejection plate (75). The ejection box (71) is fixedly connected to the outside of the core plate (1). The ejection spring (72) is fixedly connected to the inside of the ejection box (71). The ejection rod (73) is fixedly connected to the other end of the ejection spring (72) and extends to the outside of the ejection box (71). The ejection plate (75) is fixedly connected to the end of the ejection rod (73) located on the outside of the ejection box (71). The ejection groove (74) is opened on the outside of the ejection box (71).

3. A medical filter press diaphragm plate according to claim 2, characterized in that: The number of the ejection components (7) is four, and the four ejection components (7) are arranged in a rectangular array on the outside of the core plate (1). The number of ejection rods (73) is multiple. The cross-sectional shape of the ejection plate (75) is adapted to the cross-sectional shape of the ejection groove (74). The ejection rod (73) is T-shaped.

4. A medical filter press diaphragm plate according to claim 1, characterized in that: The elastic diaphragm (2) extends through and to the outer side of the core plate (1) through the limiting ring (8). There are four limiting rings (8). The end face of the elastic diaphragm (2) is provided with a connecting groove (9). Two of the limiting rings (8) are provided with connecting holes (10) that communicate with the connecting groove (9).

5. A medical filter press diaphragm plate according to claim 1, characterized in that: An air inlet groove (11) is provided on the outer side of the core plate (1), and an air inlet hole (12) communicating with the air inlet groove (11) is provided on the outer side of the arc-shaped extrusion boss (5). The extrusion chamber (4) is connected to the air inlet groove (11) through the air inlet hole (12), and multiple through holes (14) are provided on the outer side of the core plate (1).

6. A medical filter press diaphragm plate according to claim 5, characterized in that: The outer side of the core plate (1) is fixedly connected to a pull block (15). The core plate (1) is based on medical-grade reinforced polypropylene. The substrate is compounded with antibacterial modified components and anti-precipitation lubricating modified components. The inner side of the extrusion chamber (4), the inner wall of the air inlet groove (11), and the inner wall of the air inlet hole (12) of the core plate (1) are all polished.

7. A medical filter press diaphragm plate according to claim 1, characterized in that: The depth of the extrusion chamber (4) is 8mm-12mm; the height of the extrusion protrusion (6) is less than the depth of the channel of the extrusion chamber (4); there are multiple extrusion protrusions (6); and the multiple extrusion protrusions (6) are evenly distributed on the side of the elastic diaphragm (2) facing the core plate (1).

8. A medical filter press diaphragm plate according to claim 1, characterized in that: The connecting sealing groove (31) is a double-layer sealing groove, which is divided into an inner sealing groove and an outer sealing groove arranged coaxially. The inner sealing groove has a depth of 4.5-5.5mm and a width of 7.5-8.5mm, and the outer sealing groove has a depth of 3.5-4.5mm and a width of 5.5-65mm. The sealing boss (32) has an anti-slip interlocking texture on its surface, which is a mesh or strip concave-convex structure.

9. A medical filter press diaphragm plate according to claim 1, characterized in that: The elastic diaphragm (2) is molded from medical-grade hydrogenated nitrile rubber material, and the overall thickness of the elastic diaphragm (2) is 3mm-5mm; the outer surface of the elastic diaphragm (2) away from the core plate (1) is coated with a 0.1mm-0.2mm thick polytetrafluoroethylene coating.

10. A medical filter press diaphragm plate according to any one of claims 1-9, characterized in that: There are two elastic diaphragms (2), which are symmetrically distributed on the outside of the core plate (1). A connecting ring groove (13) is provided on the outside of the elastic diaphragm (2).

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