A liquid filter

Abstract

The utility model belongs to the technical field of liquid filtration, and discloses a liquid filter. The liquid filter includes a mounting seat, a filter assembly and a fixing assembly. A first connecting channel and a mounting cavity connected through a through hole are provided in the mounting seat; the filter assembly is provided in the mounting cavity; the fixing assembly is inserted into the mounting cavity from the opening of the mounting cavity and the filter assembly is pressed against the inner wall of the mounting cavity and covers the through hole; the fixing assembly includes a second connecting channel connected to the mounting cavity; the first connecting channel and the second connecting channel can both be connected to an external liquid circuit. The liquid filter realizes an integrated design, and only a new liquid filter needs to be replaced after the service life is reached, which reduces the risk of leakage and infection of operators; at the same time, during production, only the filter assembly needs to be placed in the mounting cavity and then the fixing assembly is inserted from the opening of the mounting cavity to press the filter assembly to complete the installation of the liquid filter, which is simple and fast to produce and has low cost.

Description

Technical Field

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

[0002] Liquid filtration technology is mainly used to separate liquids from solid particles and has a wide range of applications in multiple industries. Body fluid sample filtration in liquid filtration technology is a technology widely used in the medical field. Body fluid sample filtration can remove impurities, particles, cell fragments or other unwanted components from body fluids, thereby improving sample purity and ensuring the safety and effectiveness of the medical process. These functions jointly ensure the accuracy and reliability of medical experiments and improve the effectiveness and quality of medical treatment.

[0003] In the prior art, the liquid filter used for filtering body fluid samples needs to regularly replace the filter assembly to ensure the filtering effect. When replacing, the operator needs to open the liquid filter and replace the filter assembly therein, which is inconvenient; at the same time, the residual body fluid in the liquid filter and the residual body fluid on the filter assembly are likely to leak out during operation, making it easier for the operator to contact the residual body fluid, and the operator is therefore at risk of being infected by the body fluid. The disposable liquid filter in the prior art has a complicated assembly relationship between the liquid filter housing and the filter assembly and a complex production process, resulting in a high manufacturing cost. Utility Model Content

[0004] The utility model aims to provide a liquid filter, which is easy to replace, reduces the risk of leakage and infection of operators, and also has the advantages of simple and fast production and low process cost.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A liquid filter, comprising:

[0007] A mounting seat, wherein a first connecting channel and a mounting cavity are provided in the mounting seat and are interconnected through a through hole, wherein the first connecting channel can be connected to an external liquid path, and the mounting cavity has an opening;

[0008] A filter assembly, wherein the filter assembly is disposed in the installation cavity;

[0009] A fixing component is inserted into the installation cavity from the opening and presses the filter component against the inner wall of the installation cavity and covers the through hole; the fixing component includes a second connection channel connected to the installation cavity; the second connection channel can be connected to an external liquid circuit.

[0010] Preferably, the fixing assembly comprises a pressing member and a fixing member, the pressing member abuts against the filter assembly, and the fixing member is used to fix the pressing member in the installation cavity so that the pressing member presses the filter assembly.

[0011] Preferably, the second connecting channel includes a first connecting section and a second connecting section, the first connecting section is arranged through both ends of the clamping member, the second connecting section is arranged through both ends of the fixing member, and the first connecting section and the second connecting section are butt-jointed at one end close to each other.

[0012] Preferably, the first connecting section comprises a joint connecting section and a filter docking section which are interconnected, the joint connecting section is docked with the second connecting section, and one end of the filter docking section away from the joint connecting section abuts against the filter assembly.

[0013] Preferably, the caliber of the filter docking section abutting against the filter assembly is larger than the caliber of the filter docking section connecting with the joint connecting section.

[0014] Preferably, an inner wall of the installation cavity at one end away from the first connecting channel is provided with an internal thread, an outer wall of the fixing member is provided with an external thread, and an end of the fixing member close to the clamping member is provided with a snap-in groove, the snap-in groove is engaged with the clamping member, and the external thread cooperates with the internal thread, so that the fixing member fixes the clamping member in the installation cavity.

[0015] Preferably, the filter assembly comprises at least one layer of filter membrane.

[0016] Preferably, the filter membrane has multiple layers, the multiple layers of filter membrane are stacked in the installation cavity, and the filter radius of each layer of the filter membrane is different;

[0017] The filtration radius of the filtration membrane decreases from an end close to the liquid inflow to an end far away from the liquid inflow.

[0018] Preferably, the liquid filter also includes a porous member, which is arranged at one end of the filter assembly away from the clamping member and abuts against the filter assembly, and the porous member is provided with a plurality of liquid flow channels, and the plurality of liquid flow channels are all connected to the first connecting channel, and the liquid flows from the second connecting channel to the first connecting channel in the liquid filter.

[0019] Preferably, the housing of the mounting seat is provided with an indicator mark, and the indicator mark is used to mark the flow direction of the liquid in the liquid filter.

[0020] Beneficial effects: The liquid filter provided by the utility model completes the integrated design of the liquid filter by providing a mounting seat with a first connecting channel and a mounting cavity, and providing the filter assembly in the mounting cavity, and then using a fixing assembly with a second connecting channel to fix the filter assembly in the mounting seat. After the liquid filter reaches the end of its service life, it only needs to unscrew the liquid inlet joint and the liquid outlet joint, and replace the new liquid filter to connect with the liquid inlet joint and the liquid outlet joint. The operator does not need to open the liquid filter or touch the filter assembly with residual body fluids, thereby reducing the risk of leakage of the liquid filter and infection of the operator. At the same time, when producing the liquid filter, it only needs to place the filter assembly in the mounting cavity and then insert the fixing assembly from the opening of the mounting cavity to compress the filter assembly to complete the installation of the liquid filter. The production is simple and fast, and the process cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of the liquid filter provided by the utility model;

[0022] Figure 2 It is a cross-sectional view of the liquid filter provided by the utility model when the liquid inlet interface and the liquid outlet interface are connected;

[0023] Figure 3 It is a schematic diagram of the liquid filter provided by the utility model when connecting the liquid inlet interface and the liquid outlet interface;

[0024] Figure 4 It is a schematic diagram of one side of the liquid filter provided by the utility model with an indication mark.

[0025] In the figure:

[0026] 11-mounting seat; 12-porous member; 13-filter assembly; 141-pressing member; 142-fixing member; 1421-avoidance groove; 143-second connecting channel; 1431-first connecting section; 14311-joint connecting section; 14312-filter docking section; 1432-second connecting section; 15-first connecting channel;

[0027] 21-liquid inlet connector; 22-liquid outlet connector. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0032] like Figure 1As shown, the liquid filter provided in this embodiment includes a mounting seat 11, a filter assembly 13 and a fixing assembly. A first connecting channel 15 and a mounting cavity that are interconnected through a through hole are provided in the mounting seat 11, the first connecting channel 15 can be connected to an external liquid circuit, and the mounting cavity has an opening. The filter assembly 13 is provided in the mounting cavity, and the fixing assembly is inserted into the mounting cavity from the opening of the mounting cavity and presses the filter assembly 13 against the inner wall of the mounting cavity and covers the through hole. The fixing assembly includes a second connecting channel 143 that is connected to the mounting cavity, and the second connecting channel 143 can be connected to an external liquid circuit. Specifically, when installing the liquid filter, it is only necessary to place the filter assembly 13 from the opening of the mounting cavity that is connected to the outside into the mounting seat 11 and cover the through hole, and then insert the fixing assembly to fix the filter assembly 13. Further, the second connection channel 143 is a liquid inlet end, and the first connection channel 143 is a liquid outlet end. Since the first connection channel 15 is interconnected with the installation cavity, and the second connection channel 143 is also connected with the installation cavity, the liquid can flow into the installation cavity connected with the second connection channel 143 through the second connection channel 143 and pass through the filter assembly 13 disposed therein to complete filtering, and the liquid after filtration flows out through the first connection channel 15. In other embodiments, the first connection channel 15 can also be a liquid inlet end, and the second connection channel 143 is a liquid outlet end. The liquid flows into the installation cavity connected with the first connection channel 15 through the first connection channel 15 and is filtered by the filter assembly 13, and the liquid after filtration flows out through the second connection channel 143. Furthermore, the liquid filter is specifically used for filtering body fluids such as tissue fluid, plasma, and lymph.

[0033] In this embodiment, the fixing assembly includes a pressing member 141 and a fixing member 142, the pressing member 141 abuts against the filter assembly 13, and the fixing member 142 is used to fix the pressing member 141 in the installation cavity so that the pressing member 141 presses the filter assembly 13. Specifically, when installing the liquid filter, the pressing member 141 is first placed in the installation cavity to abut against the filter assembly 13, and then the fixing member 142 is inserted into the installation cavity and the pressing member 141 is fixed in the installation cavity so that the pressing member 141 presses the filter assembly 13, thereby ensuring that the position of the filter assembly 13 in the installation cavity is fixed. The pressing member 141 and the fixing member 142 can be integrated as a fixing assembly. Further, the fixing assembly can be fixed to the mounting seat 11 through a thread, thereby pressing and fixing the filter assembly 13 in the installation cavity.

[0034] In this embodiment, the second connection channel 143 includes a first connection section 1431 and a second connection section 1432. The first connection section 1431 is set to pass through both ends of the pressing member 141, and the second connection section 1432 is set to pass through both ends of the fixing member 142. The first connection section 1431 and the second connection section 1432 are butted at one end close to each other. Specifically, the second connection channel 143 passes through the entire fixing assembly, so the second connection channel 143 passes through both the pressing member 141 and the fixing member 142. The second connection channel 143 can be divided into the first connection section 1431 and the second connection section 1432 according to different penetration positions. The first connection section 1431 passes through both ends of the pressing member 141, and the second connection section 1432 passes through both ends of the fixing member 142. At the same time, the first connection section 1431 and the second connection section 1432 are butted at one end close to each other, so as to ensure that the liquid can flow between the first connection section 1431 and the second connection section 1432.

[0035] like Figure 2 and Figure 3 As shown, in this embodiment, the first connecting section 1431 includes a joint connecting section 14311 and a filter docking section 14312 that are interconnected. The joint connecting section 14311 is docked with the second connecting section 1432, and the end of the filter docking section 14312 away from the joint connecting section 14311 is abutted with the filter assembly 13. Specifically, the inflow of liquid requires the liquid inlet joint 21 to supply liquid, and the outflow of liquid requires the liquid outlet joint 22 to collect liquid. The end of the joint connecting section 14311 close to the second connecting section 1432 is provided with a conical groove. Further, the liquid inlet joint 21 is inserted into the second connecting channel 143 for liquid supply, and the end of the joint abuts against the side wall of the conical groove of the joint connecting section 14311 to limit and ensure that the liquid inlet joint 21 reaches the appropriate position. In other embodiments, the liquid outlet interface can also be inserted into the second connecting channel 143 to collect liquid and collect the filtered liquid. Furthermore, an avoidance groove 1421 is also provided at one end of the second connecting section 1432 away from the clamping piece 141, and the diameter of the avoidance groove 1421 is larger than the diameter of the joint connecting section 14311. The avoidance groove 1421 can prevent the outer wall of the joint from abutting against the outer edge of the second connecting section 1432 when joints of different specifications are inserted, so that the front end of the joint cannot abut against the joint connecting section 14311.

[0036] like Figure 2As shown, in this embodiment, the caliber of the filter docking section 14312 abutting against the filter assembly 13 is larger than the caliber of the filter docking section 14312 connecting with the joint connecting section 14311. Specifically, this setting is based on the premise that the second connecting channel 143 is the liquid inlet end, that is, the liquid inlet interface is combined with the second connecting channel 143. When the liquid inlet interface supplies liquid, the liquid passes through the connection between the filter docking section 14312 and the joint connecting section 14311. At this time, the caliber of the liquid column is the same as the caliber of the connection. After that, the liquid enters the filter docking section 14312 and fills the filter docking section 14312. At this time, the contact area between the liquid and the filter assembly 13 is larger than the liquid caliber at the initial inflow, that is, there is a larger contact area between the liquid and the filter assembly 13, which is convenient for improving the filtering effect of the liquid filtering device on the liquid. Furthermore, a liquid inlet flow channel is provided at one end of the filter docking section 14312 close to the joint connecting section 14311, and the liquid inlet flow channel ensures that the liquid to be filtered can be dispersed and contact the filter component 13 at a position close to the filter component 13, thereby preventing a large liquid holding space on one side of the filter component 13, and preventing the liquid from filling the liquid holding space, thereby causing the water volume corresponding to the area of ​​the filter component 13 to be too large, exceeding the maximum flow rate of the filter processing capacity, reducing the filtering effect and accelerating the loss of filtering consumables.

[0037] In this embodiment, the inner wall of the installation cavity away from the first connection channel 15 is provided with an internal thread, the outer wall of the fixing member 142 is provided with an external thread, and the end of the fixing member 142 close to the pressing member 141 is provided with a clamping groove, the clamping groove is engaged with the pressing member 141, and the external thread is engaged with the internal thread, so that the fixing member 142 fixes the pressing member 141 in the installation cavity. Specifically, when installing the liquid filter, the filter assembly 13 is placed in the installation cavity, and then the pressing member 141 is inserted into the installation cavity and the filter assembly 13 is pressed against the inner wall of the installation cavity, and then the fixing member 142 is threadedly connected with the mounting seat 11, and in the process of rotating the fixing member 142, the clamping groove of the fixing member 142 is gradually clamped with the pressing member 141 to prevent the pressing member 141 from shaking, and the fixing member 142 is continuously rotated to completely fix the pressing member 141 in the installation cavity, so that the pressing member 141 presses and fixes the filter assembly 13 to the inner wall of the installation cavity. By using a segmented fixing assembly, the pressing member 141 will not rotate significantly when the fixing member 142 is threadedly connected to the mounting seat 11, thereby preventing the pressing member 141 from rotating and damaging the filter assembly 13 while abutting against the filter assembly 13.

[0038] In this embodiment, the filter assembly 13 includes at least one filter membrane. Specifically, the filter assembly 13 only includes a filter membrane, and the liquid flowing through the liquid filter is filtered through the filter membrane. In some other embodiments, the filter assembly 13 can be composed of a filter element, a filter disc and a filter membrane.

[0039] In this embodiment, the filter membrane has multiple layers, and the multiple filter membranes are stacked in the installation cavity, and the filter radius of each filter membrane is different; from the end close to the liquid inflow to the end away from the liquid inflow, the filter radius of the filter membrane decreases successively. Specifically, there are four layers of filter membranes, and when the liquid flows through the four layers of filter membranes in sequence, impurities with larger radius are filtered first, and impurities with smaller radius are filtered later. This layer-by-layer filtration improves the filtration effect of the liquid, and at the same time avoids all impurities being filtered by a single layer of filter membrane at one time, prolonging the service life of the filter consumables and thus prolonging the filtration life of the liquid filter.

[0040] In this embodiment, the liquid filter further comprises a porous member 12, which is arranged at one end of the filter assembly 13 away from the pressing member 141 and abuts against the filter assembly 13, and the porous member 12 is provided with a plurality of liquid flow channels, and the plurality of liquid flow channels are all connected to the first connection channel 15, and the liquid flows from the second connection channel 143 to the first connection channel 15 in the liquid filter. Specifically, the outer diameter of the porous member 12 is larger than the caliber of the connection between the porous member 12 and the first connection channel 15. During filtration, after the liquid flows through the filter membrane, it gathers on the side of the filter assembly 13 close to the porous member 12 and flows to the first connection channel 15 through the liquid flow channel in the porous member 12. Such a setting increases the outflow path of the liquid, and avoids the impurities enriched at the contact position between the filter assembly 13 and the single flow channel caused by the liquid flowing out through a single flow channel. Further, the above-mentioned filter assembly 13 is a filter membrane, and the use of the porous member 12 also avoids the deformation of the filter membrane due to the large flow rate of the single flow channel. At the same time, there is an installation groove for the porous member 12 in the installation cavity, and the inner diameter of the installation groove is adapted to the outer diameter of the porous member 12. When installing the liquid filter, the porous member 12 is first placed in the installation groove, and the surface of the end of the porous member 12 away from the first connecting channel 15 is on the same plane as the surrounding interior of the installation cavity; then the filter membrane is placed on the plane, and finally the fixing assembly is installed to complete the installation of the entire liquid filter. The installation process requires fewer parts, simple steps, fewer process flows, and is easy to produce. Furthermore, when the first connection channel 15 is the liquid inlet end and the second connection channel 143 is the liquid outlet end, the installation process of the liquid filter is different from the above-mentioned installation method. The filter docking section 14312 is arranged at one end of the first connection channel 15 close to the installation cavity, and the porous member 12 is arranged between the filter assembly 13 and the pressing member 141, that is, the filter docking section 14312 is arranged based on the inflow of liquid, and the porous member 12 is arranged based on the outflow of liquid. When installing the liquid filter, the installation groove of the above-mentioned porous member 12 is used as a new filter docking section 14312, and then the porous member 12 of appropriate size is arranged in the previous filter docking section 14312. At the same time, under this premise, the depression at the filter docking section 14312 is not convenient for the installation of the filter membrane, so the filter assembly 13 can be replaced by a combination structure of a filter disc and a filter membrane. Specifically, a filter disc or other filter member with a rigid structure is first placed to provide support for the filter membrane, and then the filter membrane is placed to complete the installation of the filter assembly 13. At the same time, the filter radius of the filter disc should be larger than the filter membrane. At this time, the first connecting channel 15 to the second connecting channel 143 are respectively a filter disc and a multi-layer filter membrane with decreasing filter radius.

[0041] like Figure 4 As shown, the housing of the mounting seat 11 is provided with an indicator mark, which is used to indicate the flow direction of the liquid in the liquid filter. Specifically, the indicator mark is a one-way arrow. Further, the direction of the arrow points from the end of the mounting seat 11 close to the mounting cavity to the end of the mounting seat 11 close to the first connecting channel 15.

[0042] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A liquid filter, characterized in that: include: A mounting seat (11), wherein a first connecting channel (15) and a mounting cavity are provided in the mounting seat (11), the first connecting channel (15) being connected to an external fluid path, and the mounting cavity having an opening; A filter assembly (13), wherein the filter assembly (13) is disposed in the installation cavity; A fixing component is inserted into the installation cavity from the opening and presses the filter component (13) against the inner wall of the installation cavity and covers the through hole; the fixing component includes a second connecting channel (143) connected to the installation cavity; the second connecting channel (143) can be connected to an external liquid circuit.

2. The liquid filter according to claim 1, characterized in that The fixing assembly comprises a pressing member (141) and a fixing member (142); the pressing member (141) abuts against the filter assembly (13); and the fixing member (142) is used to fix the pressing member (141) in the installation cavity so that the pressing member (141) presses the filter assembly (13).

3. The liquid filter according to claim 2, characterized in that: The second connecting channel (143) includes a first connecting section (1431) and a second connecting section (1432), wherein the first connecting section (1431) is arranged to pass through both ends of the clamping member (141), and the second connecting section (1432) is arranged to pass through both ends of the fixing member (142), and the first connecting section (1431) and the second connecting section (1432) are butt-jointed at their ends close to each other.

4. The liquid filter according to claim 3, characterized in that The first connecting section (1431) includes a joint connecting section (14311) and a filter docking section (14312) which are interconnected, the joint connecting section (14311) is docked with the second connecting section (1432), and one end of the filter docking section (14312) away from the joint connecting section (14311) is abutted with the filter assembly (13).

5. The liquid filter according to claim 4, characterized in that The caliber of the abutment between the filter docking section (14312) and the filter assembly (13) is larger than the caliber of the connection between the filter docking section (14312) and the joint connection section (14311).

6. The liquid filter according to claim 5, characterized in that An inner wall of the installation cavity at one end away from the first connecting channel (15) is provided with an internal thread, an outer wall of the fixing member (142) is provided with an external thread, and an end of the fixing member (142) close to the clamping member (141) is provided with a clamping groove, the clamping groove is engaged with the clamping member (141), and the external thread cooperates with the internal thread so that the fixing member (142) fixes the clamping member (141) in the installation cavity.

7. The liquid filter according to any one of claims 1 to 6, characterized in that: The filter assembly (13) comprises at least one filter membrane.

8. The liquid filter according to claim 7, characterized in that The filter membrane has multiple layers, and the multiple layers of the filter membrane are stacked in the installation cavity, and the filter radius of each layer of the filter membrane is different; The filtration radius of the filtration membrane decreases from an end close to the liquid inflow to an end away from the liquid inflow.

9. The liquid filter according to any one of claims 2 to 6, characterized in that: The liquid filter further comprises a porous member (12), wherein the porous member (12) is arranged at one end of the filter assembly (13) away from the pressing member (141) and abuts against the filter assembly (13), and the porous member (12) is provided with a plurality of liquid flow channels, wherein the plurality of liquid flow channels are all connected to the first connecting channel (15), and the liquid flows from the second connecting channel (143) to the first connecting channel (15) in the liquid filter.

10. The liquid filter according to any one of claims 1 to 6, characterized in that: The outer shell of the mounting seat (11) is provided with an indication mark, and the indication mark is used to indicate the flow direction of the liquid in the liquid filter.

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