CN213076962U - Infusion filter - Google Patents

Abstract

The utility model relates to an infusion filter, it includes casing, filter membrane and side cap, and the casing has first installation face and second installation face including first interface and the second interface that is located both ends in the casing, and first installation face and second installation face have open-ended confined cyclic annular surface for the centre, and the sealed first installation face that is fixed in the casing in border of filter membrane, the sealed second of being fixed in the casing in border of side cap ann face. Compared with the infusion filter in the prior art, the infusion filter provided by the application has the advantages that the sealing and fixing structure of the filter membrane and the side cover is simpler, particularly the side cover, the sealing structure is greatly simplified, the sealing and fixing operation is more convenient, and the operation of sealing and fixing the edge of the side cover on the second mounting surface of the annular surface is easier; meanwhile, the structural design and manufacturing requirements of the shell are greatly reduced.

Description

Infusion filter

Technical Field

The utility model relates to the technical field of filtration, especially a transfusion filter.

Background

US patent application US20040104160a1 discloses an infusion filter comprising a central element 5 and two outer elements 3 and 4 sealingly fastened to either side of the central element 5, a filter membrane sealingly fastened to the central element 5, the outer elements 3 and 4 forming a seal with shoulders 10 on their inner surfaces and a groove 11 near the outer ring of the central element 5, thereby being fastened to the outside of the filter membrane. However, in the manufacturing process of the infusion filter, the shoulder 10 needs to be arranged on the inner surface of the outer elements 3 and 4, the groove 11 needs to be arranged on the middle element 5 close to the outer ring, the shape, the size and the position of the shoulder 10 and the groove 11 need to be strictly matched, if one of the two elements has deviation, a reliable sealing between the middle element 5 and the outer elements 3 and 4 cannot be formed, and further the risk of leakage is caused, and meanwhile, the infusion filter also puts higher requirements on the manufacturing process of the infusion filter.

Therefore, there is a need for further improvement of the sealing and fixing structure between the intermediate member and the outer member of the conventional infusion filter, which simplifies the sealing structure between the intermediate member and the outer member, and reduces the structural design and manufacturing requirements of the housing, thereby facilitating the sealing and fixing operation between the intermediate member and the outer member and simplifying the manufacturing process of the entire infusion filter.

SUMMERY OF THE UTILITY MODEL

The utility model aims to achieve the purpose of solving the problem that the sealing structure between the parts of the existing transfusion filter is complex and the sealing and fixing operation is difficult, and providing a transfusion filter with simpler sealing structure and more convenient processing and manufacturing.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an infusion filter, includes casing, filter membrane and side cap, the casing is including the first interface and the second interface that are located both ends, first installation face and second installation face have in the casing, first installation face and second installation face have the open-ended closed cyclic annular surface for the centre, the border sealing fixation in first installation face of filter membrane, the border sealing fixation in second installation face of side cap, the difference in height between first installation face and the second installation face is greater than the thickness of filter membrane, first interface communicates with the outside surface of filter membrane, the second interface communicates with the inside surface of filter membrane.

The existing infusion filter needs to be provided with a shoulder 10 on the inner surface of the outer elements 3 and 4 and a groove 11 on the middle element 5 near the outer ring during the manufacturing process, the shape, size and position of the shoulder 10 and the groove 11 need to be strictly matched, if one of the two elements has a deviation, a reliable seal between the middle element 5 and the outer elements 3 and 4 cannot be formed, and further, the risk of leakage is caused, and meanwhile, the existing infusion filter also puts higher requirements on the manufacturing process of the infusion filter.

The application provides an infusion filter, it includes casing, filter membrane and side cap, and the casing has first installation face and second installation face including first interface and the second interface that is located both ends in the casing, and first installation face and second installation face have the open-ended closed cyclic annular surface for the centre, and the sealed first installation face that is fixed in the casing in border of filter membrane, the sealed second of being fixed in the casing in border of side cap ann face. Compared with the infusion filter in the prior art, the infusion filter provided by the application has the advantages that the sealing and fixing structure of the filter membrane and the side cover is simpler, particularly the side cover, the sealing structure is greatly simplified, the sealing and fixing operation is more convenient, and the operation of sealing and fixing the edge of the side cover on the second mounting surface of the annular surface is easier; meanwhile, the structural design and manufacturing requirements of the shell are greatly reduced. And the height difference between the first mounting surface and the second mounting surface is larger than the thickness of the filter membrane, so that a certain gap is reserved between the outer side surface of the filter membrane, namely the surface of the filter membrane facing one side of the side cover and the inner surface of the side cover, and the fluid flow is facilitated.

Further, the height difference between the first mounting surface and the second mounting surface is 0.5 mm-0.8 mm.

Because the thickness of the filter membrane 2 is usually 0.2 mm-0.3 mm, and the height difference between the first mounting surface and the second mounting surface is 0.5-0.8 mm, after the filter membrane and the side cover are sealed and fixed, a certain gap is reserved between the outer side surface of the filter membrane, namely the surface of the filter membrane facing to one side of the side cover, and the inner surface of the side cover, so that the fluid flow is facilitated.

Further, the casing still includes the flange portion that is located the second installation face periphery, the height of the terminal surface of flange portion is greater than the height of second installation face, the periphery wall contact of side cap is supported and is leaned on the inner wall of flange portion.

The casing is still including being located the outer fringe part of second installation face periphery, and the height of the terminal surface of outer fringe part is greater than the height of second installation face, and the contact of the periphery wall of side cap is supported and is leaned on the inner wall of outer fringe part, and it makes the operation of side cap welded fastening to second installation face more convenient, still improves the leakproofness between side cap and casing simultaneously.

Furthermore, the thickness of the side cover is equal to the height difference between the end face of the outer edge and the second mounting surface, the side cover is welded and fixed on the second mounting surface, and welding melts enter a gap between the outer peripheral wall of the side cover and the inner wall of the outer edge to form welding seal.

The thickness of side cap equals the difference in height between the terminal surface of outer fringe part and the second installation face, and side cap welded fastening is in the second installation face, and the welding melt gets into in the gap between the inner wall of periphery wall and outer fringe part of side cap, forms welded seal, and the back is accomplished in the side cap welding, and the terminal surface of periphery part and the surface of side cap flush, forms reliable sealed between the inner wall of periphery wall and the outer fringe part of side cap.

Further, the height difference between the end surface of the outer edge portion and the first mounting surface is 2.5 mm-3.0 mm.

The height difference between the end face of the outer edge part and the first mounting surface is 2.5 mm-3.0 mm, so that the outer peripheral wall of the side cover is wrapped by the outer edge part, and the side cover is convenient to weld and position.

Furthermore, the number of the side covers, the first mounting surfaces and the second mounting surfaces is 2, the two first mounting surfaces are fixedly sealed with filter membranes, and the two side covers are respectively fixedly sealed with the two second mounting surfaces.

The quantity of side cap is 2, and two first installation faces all seal to cover have the filter membrane, and two side cap seals are fixed in the casing both sides, and the infusion filter that this application provided promptly can provide 2 times filter area, has increased filter area and pollutant carrying capacity for filtration rate.

Further, a cavity is formed in the opening between the two first mounting surfaces, and the interior of the cavity is communicated with the second port and the inner side surface of the filter membrane.

Further, the inside of casing has the support that forms sealed with its inner wall, the support forms first installation face towards side cover one side.

Furthermore, a shunting gap is formed between the end wall where the first interface of the shell is located and the support, and a positioning block is arranged at the end part, facing the first interface, of the support.

A shunting gap is formed between the end wall where the first interface of the shell is located and the support, fluid flowing in from the first interface firstly enters the shunting gap and then flows to the filter membrane from the shunting gap, and the shunting gap plays a role in buffering the fluid; or the fluid penetrating through the filter membrane firstly enters the shunting gap, then flows to the first interface from the shunting gap, and is finally discharged, and the shunting gap is used as a temporary storage area of the fluid. The end part of the bracket facing the first interface is provided with the positioning block, so that the function of limiting the sliding of the filter membrane is realized in the filter membrane welding process.

Furthermore, a gap is reserved between the outer side surface of the filter membrane and the inner surface of the side cover.

A gap is reserved between the outer side surface of the filter membrane and the inner surface of the side cover, so that the fluid on the outer side of the filter membrane can flow conveniently.

The utility model provides an infusion filter, it includes casing, filter membrane and side cap, and the casing has first installation face and second installation face including first interface and the second interface that is located both ends in the casing, and first installation face and second installation face have open-ended confined cyclic annular surface for the centre, and the sealed first installation face that is fixed in the casing in border of filter membrane, the sealed second ampere face that is fixed in the casing in border of side cap. Compared with the infusion filter in the prior art, the infusion filter provided by the application has the advantages that the sealing and fixing structure of the filter membrane and the side cover is simpler, particularly the side cover, the sealing structure is greatly simplified, the sealing and fixing operation is more convenient, and the operation of sealing and fixing the edge of the side cover on the second mounting surface of the annular surface is easier; meanwhile, the structural design and manufacturing requirements of the shell are greatly reduced. And the height difference between the first mounting surface and the second mounting surface is larger than the thickness of the filter membrane, so that a certain gap is reserved between the outer side surface of the filter membrane, namely the surface of the filter membrane facing one side of the side cover and the inner surface of the side cover, and the fluid flow is facilitated.

Drawings

The present invention will be further explained with reference to the accompanying drawings:

FIGS. 1a and 1b are perspective views of a first infusion filter according to the present invention in two different directions;

FIG. 2 is an exploded view of the infusion filter of FIGS. 1a and 1 b;

FIG. 3 is a front view of the infusion filter of FIGS. 1a and 1 b;

FIGS. 4a and 4B are cross-sectional views taken along the line A-A and the line B-B of FIG. 3, respectively;

FIG. 5 is a cross-sectional view of a central plane of the housing of the infusion filter of FIGS. 1a and 1 b;

FIG. 6 is an isometric view of a second infusion filter provided in accordance with the present invention;

FIG. 7 is an exploded view of the infusion filter of FIG. 6;

FIG. 8 is a front view of the infusion filter provided in FIG. 6;

FIGS. 9a and 9B are cross-sectional views taken along the line A-A and the line B-B of FIG. 8, respectively;

FIG. 10 is a cross-sectional view of a central plane of the housing of the infusion filter provided in FIG. 6;

fig. 11a, 11b and 11c are a front view and different direction isometric views of the housing of fig. 10.

The device comprises a shell, a first connector, a second connector, a support rib, a concave part, a positioning block, a flow dividing gap, a mounting part, an outer edge part, a filter membrane, a side cover and an exhaust hole, wherein the shell is 1, the first connector is 10, the second connector is 11, the support is 12, the support rib is 13, the concave part is 14, the positioning block is 15, the flow dividing gap is 16, the mounting part is 17.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Referring to fig. 1a, 1b and 2-5, the first infusion filter comprises a housing 1, a filter membrane 2 and a side cover 3, wherein the side cover 3 is provided with a plurality of vent holes 30.

Specifically, as shown in fig. 4a, 4b and 5, the housing 1 has one side closed and the other side open, the side cover 3 is fixed to the open side of the housing 1 in a sealing manner, the housing 1 has a first port 10 and a second port 11 at both ends, and the first port 10 and the second port 11 are used as a fluid inlet and a fluid outlet, respectively, or vice versa.

The interior of the housing 1 has a bracket 12 forming a seal with its inner wall, the bracket 12 being integrally connected at one side thereof to a side wall of the closed side of the housing 1, so that the one side of the bracket 12 forms a seal with the side wall of the closed side of the housing 1 and the other side is open toward the open side of the housing 1 and the side cover 3.

The bracket 12 forms a first mounting surface formed as a closed annular surface with an opening in the middle, toward the side cover 3, and the bracket 12 has an opening in the middle, which extends from the first mounting surface, penetrates the entire thickness of the bracket 12, and finally reaches the other side where the bracket 12 is integrated with the side wall of the closed side of the housing 1, thereby forming a cavity inside the opening. The edge of the filter membrane 2 is fixed on the first mounting surface in a sealing manner, and then the interior of the cavity is communicated with the second interface 11 and the inner side surface of the filter membrane 2.

The inner wall of the cavity formed inside the opening of the bracket 12 is fixedly connected with a support rib 13, the support rib 13 is provided with a support surface facing one side of the filter membrane 2, and the support surface of the support rib 13 refers to the surface of the support rib 13 facing one side of the filter membrane 2.

Preferably, the support rib 13 is integrally formed in a cavity formed inside the opening of the bracket 12, and the bracket 12 is integrally formed inside the housing 1, i.e. the components of the housing 1 are integrally formed by injection molding.

The first connector 10 is communicated with the outer side surface of the filter membrane 2, the second connector 11 is communicated with the inner side surface of the filter membrane 2 and the inside of the cavity, and a gap is reserved between the inner side surface of the filter membrane 2 and the supporting surface of the supporting rib 13. Wherein, the inner side of the filter membrane 2 refers to the side of the filter membrane 2 facing the inside of the cavity formed by the open inner part of the bracket 12 and the support rib 13, and the outer side refers to the side of the filter membrane 2 facing the side cover 3. Preferably, the gap between the inner surface of the filter membrane 2 and the support surface of the support rib 13 is 0.2 mm to 0.5 mm.

The thickness of the support rib 13 is smaller than that of the bracket 12, that is, the support surface of the support rib 13 is located inside the cavity formed inside the opening of the bracket 12, and the end surface of the support rib 13 opposite to the support surface is integrally connected with the side wall of the closed side of the housing 1.

During the filtration process, the filter membrane 2 is wetted and becomes heavy, and then approaches to the supporting surface of the supporting rib 13, however, the inner surface of the filter membrane 2 is not tightly attached to the supporting surface of the supporting rib 13, so that the fluid flow rate is high in the whole surface area of the filter membrane 2, and the distribution of the flow rate is relatively uniform. Compared with the existing infusion filter, the infusion filter provided by the application has higher integral filtering rate and filtering efficiency.

The first connector 10 and the second connector 11 are respectively located at the center of two ends of the housing 1, and the number of the support ribs 13 is multiple, and the support ribs are symmetrically and separately arranged at two sides of a connecting line between the first connector 10 and the second connector 11. The extending direction of the support rib 13 is parallel to the direction of the connecting line between the first connector 10 and the second connector 11. For example, the number of the support ribs 13 is 2, and 2 support ribs 13 are symmetrically arranged on both sides of a connecting line between the first connector 10 and the second connector 11. The extending direction of the support ribs 13 is parallel to the flowing direction of the fluid, so that the fluid can flow conveniently, and the filtering speed is increased.

As shown in fig. 4b, the support ribs 13 gradually increase in width from the support surface thereof facing the filter membrane 2 toward the direction away from the filter membrane 2, i.e., the support surface of the support rib 13 and the end surface thereof on the opposite side to the support surface have the smallest width and the largest width at the central surface. Alternatively, the support rib 13 has a trapezoidal cross section as a whole, and has a support surface with a smallest width, which gradually increases from the support surface toward the end surface on the side opposite to the support surface, and a largest width at the end surface on the side opposite to the support surface.

Preferably, the width of the support rib 13 at the minimum width is 30-50% of the width at the maximum width. The width of the support surface is minimized, reducing the contact area between the support surface and the filter membrane 2, while ensuring that the support ribs 13 have sufficient strength.

The support rib 13 has a plurality of recesses 14 on the support surface side, and the recesses 14 are notches formed on the support surface side. The distance between the bottom surface of the recess 14 and the support surface is 0.5 mm-1.2 mm.

The arrangement of the concave part 14 further reduces the contact area between the inner surface of the filter membrane 2 and the support rib 13, and meanwhile, the concave part 14 is beneficial to the fluid in the cavity to flow to the second connector 11, so that the flow rate of the fluid is accelerated.

A diversion gap 16 is arranged between the end wall of the housing 1 where the first interface 10 is located and the bracket 2, and the end of the bracket 12 facing the first interface 10 is provided with a positioning block 15. Preferably, the positioning block 15 is located at a middle position of the end of the bracket 12. In the process of welding and fixing the filter membrane 2 to the first mounting surface of the bracket 12, the positioning block 15 plays a role in limiting the sliding of the filter membrane 2, and when the filter membrane 2 is welded, the filter membrane 2 is firstly positioned on the first mounting surface, and the end part of the filter membrane 2 is contacted and abutted against the end surface of the positioning block 15, so that the sliding of the filter membrane 2 is limited, and the welding dislocation of the filter membrane 2 is avoided.

The fluid flowing in from the first connector 10 firstly enters the shunting gap 16 and then flows to the filter membrane 2 from the shunting gap 16, and the shunting gap 16 plays a role in buffering the flow impact of the fluid; alternatively, the fluid penetrating the filter membrane 2 first enters the flow dividing gap 16, then flows from the flow dividing gap 16 to the first port 10, and finally is discharged, and the flow dividing gap 16 serves as a temporary storage area for the fluid.

Further, as shown in fig. 2 and 4a, in order to facilitate the sealing and fixing of the side cover 3, a mounting portion 17 is further provided inside the housing 1 and on the outer periphery of the first mounting surface of the bracket 12, the mounting portion 17 has an opening in the middle, and the outer peripheral wall thereof is in sealing connection with the inner wall of the housing 1. Preferably, the mounting portion 17 and the bracket 12 are integrally formed inside the housing 1. The side surface of the mounting portion 17 facing the open side of the housing 1 forms a second mounting surface, which is also a closed annular surface having an opening in the middle, and the edge of the side cover 3 is fixed to the second mounting surface in a sealing manner.

Since the mounting portion 17 has an opening in the middle, the second mounting surface is also a closed annular surface having an opening in the middle, and the width of the second mounting surface is smaller than the width of the first mounting surface, that is, the distance between the end surface of the mounting portion 17 away from the inner wall of the housing 1 and the inner wall of the housing 1 is smaller than the distance between the end surface of the bracket 12 away from the inner wall of the housing 1 and the inner wall of the housing 1.

Since the edge of the filter membrane 2 is fixed to the first mounting surface in a sealing manner and the edge of the side cover 3 is fixed to the second mounting surface in a sealing manner, a certain gap needs to be reserved between the outer side surface of the filter membrane 2, namely the surface of the filter membrane 2 facing the side cover 3 and the inner surface of the side cover 3 in order to facilitate fluid flow, and therefore, the height difference between the first mounting surface and the second mounting surface is set to be larger than the thickness of the filter membrane 2.

Specifically, the thickness of the filter membrane 2 is usually 0.2 mm to 0.3 mm, and the height difference between the first mounting surface and the second mounting surface is set to 0.5 mm to 0.8 mm.

The side cover 3 is welded and fixed on the second mounting surface, in order to conveniently weld and fix the side cover 3 on the second mounting surface and improve the sealing performance between the side cover 3 and the shell 1, the shell 1 further comprises an outer edge part 18 positioned at the periphery of the second mounting surface, and the height of the end surface of the outer edge part 18 is larger than that of the second mounting surface. After the welding is completed, the outer peripheral wall of the side cover 3 contacts and abuts against the inner wall of the outer peripheral portion 18.

The thickness of the side cover 3 is equal to the height difference between the end surface of the outer edge 18 and the second mounting surface, and in the process of welding and fixing the side cover 3 on the second mounting surface, welding melt enters a gap between the outer peripheral wall of the side cover 3 and the inner wall of the outer edge 18 to form welding seal. The side cover 3 is welded and its outer surface is flush with the end face of the outer edge 18.

The height difference between the end surface of the outer edge 18 and the first mounting surface is set to 2.5 mm to 3.0 mm, and the thickness of the side cover 3 is defined to be 1.7 mm to 2.5 mm in order to ensure that the outer surface of the side cover 3 is flush with the end surface of the outer edge 18.

The second infusion filter shown in fig. 6-11 a-11c comprises a housing 1, a filter membrane 2 and a side cover 3. The structure of the side cover 3 in the second infusion filter is identical to that of the side cover 3 in the first infusion filter.

The housing 1 of the first infusion filter and the housing 1 of the second infusion filter are also substantially identical in construction, except that the housing 1 of the second infusion filter is open on both sides, as shown in fig. 9a, 9b and 10.

The inside of the housing 1 has a bracket 12 forming a seal with the inner wall thereof, and both sides of the bracket 12 form two first mounting surfaces, and the bracket 12 has an opening in the middle thereof, the opening extending between the two first mounting surfaces of both sides of the bracket 12, penetrating the entire thickness of the bracket 12, thereby forming a cavity inside the opening, and thus the two first mounting surfaces are formed as a closed annular surface having an opening in the middle thereof.

Preferably, the bracket 12 is integrally formed inside the housing 1, and two first mounting surfaces of the bracket 12 are symmetrically arranged, and the two first mounting surfaces are both fixed with the filter membrane 2 in a sealing manner, that is, both sides of the cavity are both covered with the filter membrane 2 in a sealing manner.

The inner wall of the cavity formed inside the opening in the middle of the two first support surfaces of the bracket 12 is also fixedly connected with a support rib 13, the support rib 13 is provided with two support surfaces facing the filter membranes 2 on the two sides of the cavity, and the two support surfaces of the support rib 13 refer to the two surfaces of the filter membranes 2 facing the two sides of the cavity of the support rib 13.

Similarly, the first connector 10 and the second connector 11 are respectively located at the center of two ends of the housing 1, and the number of the support ribs 13 is plural, and the support ribs are symmetrically and separately arranged at two sides of a connecting line between the first connector 10 and the second connector 11. The extending direction of the support rib 13 is parallel to the direction of the connecting line between the first connector 10 and the second connector 11. For example, the number of the support ribs 13 is 2, and 2 support ribs 13 are symmetrically arranged on both sides of a connecting line between the first connector 10 and the second connector 11. The extending direction of the support ribs 13 is parallel to the flowing direction of the fluid, so that the fluid can flow conveniently, and the filtering speed is increased.

As shown in fig. 9b, the support ribs 13 gradually increase in width from the two support surfaces facing the filter membrane 2 on both sides of the cavity toward the direction away from the filter membrane 2, i.e., the two support surfaces of the support ribs 13 have the smallest width and the largest width at the central surface. Preferably, the width of the support rib 13 at the minimum width is 30-50% of the width at the maximum width. The width of the central plane is the largest, the width of the supporting plane is the smallest, the contact area between the supporting plane and the filter membrane 2 is reduced, and meanwhile, the supporting ribs 13 are ensured to have enough strength.

As shown in fig. 9a and 10, both sides of the support rib 13 have a plurality of recesses 14, and the recesses 14 are notches formed on both sides of the support rib 13. Preferably, the distance between the bottom surface of the recess 14 and the support surface is 0.5 mm to 1.2 mm in the same side of the support rib 13.

The filter membrane 2 covers both sides of the cavity in two ways.

Two filter membranes 2 are fixed in two first installation faces through the border is sealed respectively to the both sides of cavity are all sealed to be covered with filter membrane 2, and the inside of cavity forms the intercommunication with the inboard surface of second interface 11 and two filter membranes 2, first interface 10 and the outside surface intercommunication of two filter membranes 2. Meanwhile, a diversion gap 16 is formed between the end wall of the housing 1 where the first connector 10 is located and the bracket 12, a positioning block 15 is arranged at the end of the bracket 12 facing the first connector 10, and the positioning block 15 penetrates through the interior of the diversion gap 16. Because two filter membranes 2 need to be welded, two end faces of the positioning block 15 respectively protrude out of the two first mounting surfaces, and the height of the two end faces protruding out of the two first mounting surfaces is larger than the thickness of the two filter membranes 2.

Or, a filter membrane 2 with a larger area can be folded and welded to the two first mounting surfaces along the edge and the vicinity of the middle part, and then the two first mounting surfaces are simultaneously sealed and covered on the two sides of the cavity. Namely, a filter membrane 2 with a larger area is firstly welded and sealed on one first mounting surface, then the end part of the wrapping bracket 12 facing the first interface 10 is folded and then welded and sealed on the other first mounting surface. In this case, the end of the filter membrane 2 does not need to be positioned during the welding process of the filter membrane 2, and therefore, the end of the bracket 12 facing the first connector 10 may not be provided with the positioning block 15.

In the above two cases, after the filter membrane 2 is welded, the two sides of the cavity are both sealed and covered with the filter membrane 2, the first connector 10 is communicated with the outer side surface of the filter membrane 2, the second connector 11 is communicated with the inner side surface of the filter membrane 2 and the inside of the cavity, and a gap is reserved between the inner side surface of the filter membrane 2 and the two supporting surfaces of the supporting rib 13. Wherein, the inner side of the filter membrane 2 refers to the side of the filter membrane 2 facing the inside of the cavity formed by the open inner part of the bracket 12 and the support rib 13, and the outer side refers to the side of the filter membrane 2 facing the side cover 3.

Preferably, after the filter membrane 2 is fixed, the gap between the first mounting surface and the supporting surface of the supporting rib 13 is 0.2 mm-0.5 mm in the same side of the bracket 12, that is, the gap between the inner side surface of the filter membrane 2 and the supporting surface of the supporting rib 13 is 0.2 mm-0.5 mm in the same side of the bracket 12, which ensures that the surface of the filter membrane 2 will not be tightly attached to the supporting surface of the supporting rib 13 even if the filter membrane 2 is close to the supporting surface of the supporting rib 13 after being wetted and heavy, and meanwhile, the volume of the infusion filter is not too large.

Correspondingly, the outer peripheries of the two first mounting surfaces of the bracket 12 are respectively provided with a mounting part 17, and the two mounting parts 17 have the same structure as the mounting part 17 in the first infusion filter and are symmetrically arranged on the two first mounting surfaces of the bracket 12. Preferably, the two mounting portions 17 and the bracket 12 are integrally formed inside the housing 1.

Two second mounting surfaces are formed on two side surfaces of the two mounting parts 17, which are open towards the shell 1, the peripheral walls of the two second mounting surfaces are hermetically connected with the inner wall of the shell 1, and the edges of the two side covers 3 are hermetically fixed on the two second mounting surfaces. The mounting portion 17 has an opening in the middle, so that the two second mounting surfaces are also closed annular surfaces having an opening in the middle, and the width of the second mounting surface is smaller than the width of the first mounting surface, that is, the distance between the end surface of the mounting portion 17 away from the inner wall of the housing 1 and the inner wall of the housing 1 is smaller than the distance between the end surface of the bracket 12 away from the inner wall of the housing 1 and the inner wall of the housing 1.

Because the edge of the filter membrane 2 is fixed on the first mounting surface in a sealing way, and the edges of the two side covers 3 are fixed on the two second mounting surfaces in a sealing way, certain gaps are required to be reserved between the outer side surfaces of the filter membrane 2, namely the surfaces of the filter membrane 2 facing one sides of the side covers 3 and the inner surfaces of the two side covers 3 respectively in order to facilitate the flow of fluid, and therefore, the height difference between the first mounting surface and the second mounting surface is set to be larger than the thickness of the filter membrane 2.

Likewise, since the thickness of the filter membrane 2 is usually 0.2 mm to 0.3 mm, the height difference between the first mounting surface and the second mounting surface in the same side, inside the housing 1, is set to 0.5 mm to 0.8 mm.

The two side covers 3 are welded and fixed to the two second mounting surfaces, and in order to facilitate welding and fixing the two side covers 3 to the two second mounting surfaces and improve the sealing property between the two side covers 3 and the housing 1, the housing 1 further includes two outer edge portions 18 located at the peripheries of the two second mounting surfaces. The outer edge 18 of the second infusion filter has the same configuration as the outer edge 18 of the first infusion filter.

Preferably, the two outer edge portions 18 are symmetrically disposed on the outer peripheries of the two second mounting surfaces. The heights of the end surfaces of the two outer edge portions 18 are larger than the heights of the two second mounting surfaces, and after welding, the outer peripheral walls of the two side covers 3 contact and abut against the inner walls of the outer edge portions 18.

The thickness of the side covers 3 is equal to the height difference between the end surfaces of the outer edge parts 18 and the second mounting surfaces, and in the process that the two side covers 3 are welded and fixed on the two second mounting surfaces, welding melts enter gaps between the outer peripheral walls of the two side covers 3 and the inner walls of the two outer edge parts 18 to form welding seal. The side covers 3 are welded and the outer surfaces thereof are flush with the end surfaces of the outer edge portions 18.

The height difference between the end surfaces of the outer edge portions 18 and the first mounting surface is set to be 2.5 mm to 3.0 mm, and in order to ensure that the outer surfaces of the two side covers 3 are flush with the end surfaces of the two outer edge portions 18, the thickness of the two side covers 3 is equal and is limited to 1.7 mm to 2.5 mm.

The preferred embodiments of the present invention have been described in detail, but it should be understood that various changes and modifications can be made by those skilled in the art after reading the above teaching of the present invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims (10)

1. The utility model provides an infusion filter, includes casing, filter membrane and side cap, the casing is including the first interface and the second interface that are located both ends, its characterized in that: the filter membrane is characterized in that a first mounting surface and a second mounting surface are arranged in the shell, the first mounting surface and the second mounting surface are closed annular surfaces with openings in the middle, the edge of the filter membrane is fixed to the first mounting surface in a sealing mode, the edge of the side cover is fixed to the second mounting surface in a sealing mode, the height difference between the first mounting surface and the second mounting surface is larger than the thickness of the filter membrane, the first connector is communicated with the outer side surface of the filter membrane, and the second connector is communicated with the inner side surface of the filter membrane.

2. The infusion filter of claim 1, wherein the difference in height between the first mounting surface and the second mounting surface is between 0.5 mm and 0.8 mm.

3. The infusion filter according to claim 1 or 2, wherein the housing further comprises a rim portion located on the periphery of the second mounting surface, the height of the end surface of the rim portion is greater than the height of the second mounting surface, and the peripheral wall of the side cover contacts against the inner wall of the rim portion.

4. The infusion filter according to claim 3, wherein the side cover has a thickness equal to a height difference between the end surface of the outer peripheral edge and the second mounting surface, the side cover is welded and fixed to the second mounting surface, and a weld melt enters a gap between the outer peripheral wall of the side cover and the inner wall of the outer peripheral edge to form a weld seal.

5. The infusion filter according to claim 4, wherein the difference in height between the end surface of the outer edge portion and the first mounting surface is 2.5 mm to 3.0 mm.

6. The infusion filter according to claim 1 or 2, wherein the number of the side covers, the first mounting surfaces and the second mounting surfaces is 2, the two first mounting surfaces are both fixedly sealed with the filter membrane, and the two side covers are respectively fixedly sealed with the two second mounting surfaces.

7. The infusion filter according to claim 6, wherein the interior of the opening intermediate the two first mounting surfaces forms a cavity, the interior of the cavity being in communication with the second port and the inside surface of the filter membrane.

8. The infusion filter according to claim 1, wherein the housing has a bracket formed on an interior thereof for sealing with an interior wall thereof, the bracket forming a first mounting surface on a side facing the side cover.

9. The infusion filter according to claim 8, wherein a diversion gap is formed between an end wall of the housing where the first port is located and the bracket, and an end of the bracket facing the first port is provided with a positioning block.

10. The infusion filter of claim 1, wherein a space is provided between the outer surface of the filter membrane and the inner surface of the side cover.

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