CN214913724U

CN214913724U - Device for trapping particles in fluid

Info

Publication number: CN214913724U
Application number: CN202120828486.3U
Authority: CN
Inventors: 周向前; 郭鸿晨
Original assignee: 周向前
Current assignee: Baiji Nanotechnology (Shanghai) Co.,Ltd.
Priority date: 2021-04-21
Filing date: 2021-04-21
Publication date: 2021-11-30
Anticipated expiration: 2031-04-21

Abstract

The utility model discloses a trapping device of granule in fluid. The trapping device includes: a housing having an inner wall defining an interior passage; a plurality of filter elements positioned within the internal passage and spaced apart from each other along a direction of extension of the internal passage, at least a portion of an outer periphery of each of the filter elements sealingly engaging the inner wall, at least one of the filter elements being movable along the direction of extension of the internal passage; wherein the filter pore sizes of at least two of the plurality of filter elements are different from each other. Through the utility model discloses, the screening and the entrapment of unidimensional granule in the fluid can be realized to obtain the fluid of the high concentration of different granules, thereby be convenient for carry out the short-term test of composition in the fluid.

Description

Device for trapping particles in fluid

Technical Field

The utility model relates to a fluid processing field especially relates to a entrapment device of granule in fluid and the entrapment method of granule in the fluid.

Background

In fluids (e.g., gases, liquids), various particles are often contained. Filtration is the operation of passing a fluid (e.g., gas, liquid) through a medium, with particles therein being retained by the medium.

In the prior art, the filtering of particles can be achieved by controlling the flow of fluid through the filter element, however, in situations where the fluid capacity is limited or the fluid is not readily flowable, it is difficult to achieve filtering or entrapment of the fluid.

Moreover, in the prior art, the filter element can only realize the screening and the interception of large particles, such as: the mask filters out particles larger than a certain diameter from the gas, which may be called large particle barrier filtration, and for example, a semipermeable membrane used in hemodialysis allows small molecules to permeate through the membrane, thereby blocking particles larger than the membrane pore size, such as proteins, erythrocytes, leukocytes, bacteria and viruses. The filtering function is single, and the requirements of various particle sizes are difficult to meet.

Therefore, the prior art is difficult to realize the interception and filtration of particles in the scene with limited fluid capacity or inconvenient flowing, and has the problem of single function.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving the granule entrapment device among the prior art and be difficult to under the fluid capacity is limited or the condition of being not convenient for flow, realize holding back and filtering of granule, and the problem of function singleness.

In order to solve the above technical problem, the present invention provides a device for trapping particles in a fluid, the fluid containing a plurality of particles, comprising:

a housing having an inner wall defining an interior passage;

optionally, a plurality of said filter elements are located within said internal passage and spaced apart from each other along the extension direction of said internal passage, at least a portion of the outer periphery of each said filter element sealingly engages said inner wall, at least one of said plurality of said filter elements being movable along the extension direction of said internal passage;

wherein the filter pore sizes of at least two of the plurality of filter elements are different from each other.

Optionally, an opening is provided at one end of the internal channel, and the trapping device further comprises an end cap detachably connected with the housing and closing the opening.

Optionally, an end of the internal passage is provided with an opening, the at least one filter element being movable into and out of the end of the internal passage.

Optionally, the at least one filter element is a plurality of filter elements having a smallest pore size.

Optionally, the internal passage is a circumferentially closed passage, and the entire periphery of at least one of the filter elements is in sealing engagement with the internal wall.

Optionally, the entire periphery of at least one of the filter elements is provided with a circumferentially extending sealing ring forming a sealing engagement between the at least one filter element and the inner wall of the housing.

Optionally, the radial dimension of the outer peripheral surface of the seal ring varies axially.

Optionally, the outer peripheral surface of the sealing ring is provided with at least one radial protrusion.

Optionally, an axially central portion of at least one of the radial projections is provided with a circumferentially extending annular groove.

Optionally, the radial dimension of the outer peripheral surface of the seal ring is constant in the axial direction, the inner wall is provided with annular protrusions which are evenly spaced from each other in the axial direction and extend in the circumferential direction, and the axial distance between every two adjacent annular protrusions is smaller than the axial length of the seal ring.

Optionally, the outer peripheral surface of the sealing ring is provided with at least two radial protrusions spaced apart from each other in the axial direction, the inner wall is provided with annular protrusions uniformly spaced apart from each other in the axial direction and extending in the circumferential direction, and the axial distance between two adjacent annular protrusions is smaller than the axial length occupied by the radial protrusions of the sealing ring.

Optionally, the axial distance between two adjacent annular protrusions is smaller than the axial length of any radial protrusion of the seal ring.

Optionally, the outer peripheral surface of the seal ring is provided with at least two radial protrusions spaced apart from each other in the axial direction, the inner wall is provided with annular protrusions uniformly spaced apart from each other in the axial direction and extending in the circumferential direction, and the axial length of any one of the annular protrusions is greater than the axial distance between adjacent radial protrusions of the seal ring.

Optionally, the filter element comprises a support frame and a filter membrane, the support frame being located at one axial end of the filter membrane.

Optionally, the filter element is a filter membrane, and the sealing ring is in sealing connection with the filter membrane.

Optionally, an inner periphery of the seal ring is bonded to an outer periphery of the filter membrane.

Optionally, an axial end face of the sealing ring is bonded to an axial end face of the filter membrane.

Optionally, the support frame is provided with axial through parts, and the total area of the through parts is larger than that of the filtering holes in the filtering membrane.

Optionally, the internal passage is cylindrical, the outer periphery of at least one of the at least some filter elements is provided with an external thread, and the inner wall is provided with an internal thread, the external thread being engaged with the internal thread, and the length of the internal thread being greater than the length of the external thread.

Optionally, be equipped with the nut in the casing, the peripheral surface of nut is equipped with the external screw thread, the external screw thread with the internal thread meshing of inner wall, the nut still is equipped with the screw hole, at least one filter is connected with the threaded rod, the threaded rod with the nut screw hole thread meshing.

Optionally, the at least one filter element is connected to a threaded pipe, which is provided with an external thread, which engages with an internal thread of the inner wall.

Optionally, the internal channel is cylindrical.

Optionally, the plurality of filter elements is two filter elements.

Optionally, the internal passage is cylindrical, and the two filter members include a first filter member and a second filter member, the first filter member having a larger pore size than the second filter member, the first filter member being fixed to one end of the internal passage, and the second filter member being movable in an extending direction of the internal passage.

Optionally, the second filter element is connected to a push rod extending perpendicular to the second filter element.

Optionally, one end of the internal channel is provided with an outflow channel, and a valve is arranged in the outflow channel.

Optionally, the second filter element is configured to be movable into and out of the other end of the internal passage.

Optionally, the radial cross-sectional areas of the sections in which at least two of the filter elements are located are different from each other.

Optionally, the radial cross-sectional area of the section in which at least one of the plurality of filter elements is located is 0.01 to 50 times the radial cross-sectional area of the section in which at least one other of the plurality of filter elements is located.

Optionally, at least one of the following is also included: a stirring device located within the internal passage, a vibrating device located within the internal passage, and a housing vibrating device.

Optionally, a filter member vibrating device is included, the filter member vibrating device being coupled to and driving at least one of the plurality of filter members to vibrate.

Optionally, at least one pair of adjacent filter elements of the plurality of filter elements have a pore size greater than and less than, respectively, a size of at least one particle in the fluid.

Optionally, the filter element has a pore size larger and smaller than, respectively, a size of at least one particle in the fluid.

Optionally, the filter element with the smaller filter hole of the two filter elements is connected to a push rod, which extends perpendicularly to the filter elements.

Optionally, the casing falls into head section, middle section and the tail section that can dismantle the connection in proper order along the extending direction, two filter the less filter of filtration pore in the filter and be in but axial motion in the head section, two filter the great filter of filtration pore is fixed in the filter the tip that the tail end is close to in the middle section, the tail end of tail section is sealed.

Optionally, the trapping device further comprises an end cap detachably connected to the housing and closing one end of the internal passage, the end cap is provided with a threaded hole penetrating through the end cap, the push rod is a threaded rod, and the threaded hole is in threaded engagement with the threaded rod.

Optionally, the filter device further comprises a filter driving portion, wherein the filter driving portion is connected with the at least one of the plurality of filter devices and drives the at least one filter device to move along the extending direction of the internal passage.

Optionally, a control device is included, the control device being in communication with the filter drive and controlling the drive of the at least one filter by the filter drive.

Optionally, the drive portion is a push rod connected to one of the at least one filter element, the push rod extending perpendicular to the one of the at least one filter element.

Optionally, the filter assembly further comprises an inflow channel disposed on the inner wall, the inflow channel being located between a pair of adjacent filter elements in the plurality of filter elements.

Optionally, a one-way valve is provided in the inflow channel, the one-way valve allowing fluid flow only towards the internal channel.

Optionally, the filter assembly further comprises an outflow channel disposed on the inner wall, the outflow channel being located between at least one pair of adjacent filter elements in the plurality of filter elements or at an end of the internal channel.

Optionally, two of the filter members are secured to the inner wall with an opening at the bottom of the internal passage between the two filter members.

Optionally, at least one end of the internal passage in the extending direction has a cross-sectional dimension smaller than that of the rest.

A method of trapping particles in a fluid, comprising the steps of: providing a trapping device for particles in said fluid; placing a fluid containing a plurality of particles within the internal passage between a pair of adjacent filter elements of the plurality of filter elements;

moving at least one of the pair of adjacent filter members in a direction of extension of the internal passageway to bring the pair of adjacent filter members into proximity with each other such that the fluid passes through the pair of adjacent filter members and such that particles in the fluid having a size smaller than a size of pores of one of the pair of adjacent filter members are located on a side of the one filter member facing away from the other filter member and particles having a size larger than the sizes of pores of the two of the pair of adjacent filter members are located between the pair of adjacent filter members.

Optionally, the at least one filter element is a filter element having a smaller pore size of the pair of adjacent filter elements.

Optionally, one of the pair of adjacent filter elements is movable into and out of one end of the internal passage, and the act of placing the fluid containing the plurality of particles between the pair of adjacent filter elements is moving the one filter element out of the internal passage, placing the fluid into the internal passage, and moving the one filter element into the internal passage such that the fluid is located between the pair of adjacent filter elements.

Optionally, the plurality of filter members are a first filter member and a second filter member, the first filter member has a pore size larger than that of the second filter member, the first filter member being secured to one end of the internal passage and the second filter member being arranged for axial movement into and out of the other end of the internal passage, an outflow channel is arranged at one end of the internal channel, a valve is arranged in the outflow channel and is closed, wherein placing a fluid containing a plurality of particles between a pair of adjacent filter elements of the plurality of filter elements within the internal passage includes placing the housing such that one end of the internal passage is a lower end and another end of the internal passage is an upper end, and moving said second filter element out of said upper end of said internal passage and placing fluid into said internal passage from said upper end;

moving at least one of the pair of adjacent filter members in the direction of extension of the internal passageway includes moving the second filter member into the upper end of the internal passageway and moving the second filter member downward toward the first filter member a predetermined distance.

Optionally, a valve is disposed in the outflow channel, and the method further comprises the steps of:

opening the valve;

moving the second filter member further downwardly toward the first filter member.

Optionally, moving the second filter member further downwardly toward the first filter member comprises moving the second filter member into contact with the first filter member.

Optionally, the movement of the second filter element further down towards the first filter element is performed in a plurality of stages.

Alternatively, the process of moving the second filter member downward toward the first filter member by a predetermined distance is performed in a plurality of stages.

Through the utility model discloses a entrapment device of granule in the fluid can realize the screening and the entrapment of the not unidimensional granule in the fluid to obtain the fluid of the high concentration of different granules, thereby be convenient for carry out the short-term test of composition in the fluid.

Drawings

Fig. 1 is a schematic view of a device for trapping particles in a fluid according to a first embodiment of the present invention.

Fig. 2a-2d are schematic views of a device for trapping particles in a fluid according to a second embodiment of the present invention.

Figures 3a-3d are schematic views of a device for trapping particles in a fluid according to a third embodiment of the present invention.

Fig. 4a and 4b are schematic views of a trapping device for particles in a fluid according to a fourth embodiment of the present invention.

Fig. 5a and 5b are schematic views of a trapping device for particles in a fluid according to a fifth embodiment of the present invention.

Figure 6a is a schematic view of a device for trapping particles in a fluid according to a sixth embodiment of the present invention.

Fig. 6b and 6c show bottom views of the first part and the second part, respectively, of the embodiment shown in fig. 6 a.

Fig. 7a-7i respectively show the sealing fit structure between the filter element and the inner wall of the housing according to the present invention.

Fig. 7j shows a partially enlarged view of region B in fig. 7 g.

Fig. 8a-8f show further embodiments of the sealing engagement between the filter element and the inner wall of the housing according to the invention.

Fig. 8g shows a partial enlarged view of region a in fig. 8 a.

Figures 9a-9e show schematic views of a trapping device for particles in a fluid according to a seventh embodiment of the present invention.

List of reference numerals:

1. the trapping device for particles in a fluid of the first embodiment; 11. a housing; 12a-12d, a filter element; 111. An inner wall; 112. an internal channel; 113. an inflow channel; 114. an inflow control valve; 13. a filter driving section; 14. a drive controller; 115. an outflow channel; 116. an outflow control valve; 117. an enrichment chamber; 15. A filter member vibrating device; 16. a housing vibrating device; 17. a one-way valve; 2. the trapping device for particles in a fluid of the second embodiment; 21. a housing; 22. a first filter member; 23. a second filter member; 212. an internal channel; 211. an inner wall; 24. an opening; 2121. an upper section; 2122. a lower section; 25. a push rod; 26. a first control valve; 27. a second control valve; 28. a grip portion; 3. a trapping device for particles in a fluid of the third embodiment; 31. a housing; 32. a first filter member; 33. a second filter member; 312. an internal channel; 311. An inner wall; 35. a threaded pipe; 38. a grip portion; 4. a trapping device for particles in a fluid of the fourth embodiment; 41. a housing; 42. a first filter member; 43. a second filter member; 412. an internal channel; 411. an inner wall; 4121. an upper section; 4122. a lower section; 46. an upper cover; 47. a nut; 413. a first portion; 414. a second portion; 471. a threaded hole; 45. a push rod; 415. an exhaust valve; 5. a trapping device for particles in a fluid of the fifth embodiment; 51. a housing; 52. a first filter member; 53. a second filter member; 512. an internal channel; 511. an inner wall; 54. a threaded pipe; 58. a grip portion; 5121. an upper section; 5122. a lower section; 513. a first portion; 514. a second portion; 515. an exhaust valve; 5131. the upper half section; 5132. a lower half section; 6. a trapping device for particles in a fluid of the sixth embodiment; 67. an upper cover; 671. a threaded hole; 61. a housing; 613. A first portion; 614. a second portion; 615. a third portion; 612. an internal channel; 6121. an upper section; 6122. a middle section; 6123. a lower section; 62. a first filter member; 63. a second filter member; 65. a threaded rod; 68. a grip portion; 6141. a groove; 6151. a groove; 6152. a support frame; 121. a seal ring; 2211. A radial protrusion; 122. a filtration membrane; 123. a support frame; 1111. an annular protrusion; 22111. an annular groove; 9. a trapping device for particles in a fluid of the seventh embodiment; 91. a housing; 912. an internal channel; 92. a first filter member; 93. a second filter member; 95. a push rod; 96. and (4) a valve.

Detailed Description

Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising," are to be understood as an open, inclusive meaning, i.e., as being interpreted to mean "including, but not limited to," unless the context requires otherwise.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.

In the following description, for the sake of clarity, the structure and operation of the present invention will be described with the aid of directional terms, but the terms "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be understood as words of convenience and not as words of limitation. As used herein, "distal" and "proximal" of "distal", "proximal" and "distal" are relative to the position of the operator of the device, i.e., "proximal to the operator and" distal "away from the operator.

As shown in fig. 1, the trapping device 1 for particles in a fluid according to the first embodiment of the present invention includes a housing 11 and four

filter members

12a, 12b, 12c, and 12d disposed in the housing 11, the four

filter members

12a, 12b, 12c, and 12d being arranged in this order from left to right. Wherein the housing 11 has an inner wall 111 defining an inner passage 112, and the four filter members 12a-12d are located within the inner passage 112 and spaced apart from each other in the extending direction of the inner passage 112, and the outer peripheral surface of each filter member 12 is in sealing engagement with the inner wall 111 defining the inner passage 112. More specifically, in the embodiment shown in fig. 1, the four filter members 12a-12d are movable within the internal passage 112 in the direction in which the internal passage 112 extends, i.e., in the left-right direction in the drawing, so as to allow the fluid within the internal passage 112 to pass through each filter member 12 as needed. It should be understood, however, that only a portion of the four filter members 12a-12d may be capable of movement in the direction of extension of the internal passage 112. Wherein the filter openings of the four filter members 12a-12d are different in size from each other. The filter pore size can be understood as: if the filter elements 12a-12d have filter pores of the same shape, the size of the filter pores can be characterized by any parameters of the filter pores, such as area, pore size, maximum pore size, minimum pore size, etc., and the shape of the filter pores can be arbitrarily set according to the requirement, such as circular shape, polygonal shape, elliptical shape, olive shape, etc. In addition, the shape of the filter openings used in the various filter elements 12a-12d may vary, and the size of the openings therein may be selected to be a parameter that characterizes the size of the particles that the openings will pass through. Here, the particles are not limited to circular particles, but may be in any shape, and the size of the particles refers to the maximum cross-sectional size of the particles. The shut-off member means a member through which fluid cannot pass, and the filter member means a member provided with filter holes, in which only particles having a size smaller than the filter holes can pass through the filter member. In an embodiment of the invention, the flow resistance of the filter element is sufficiently large that the fluid does not flow through the filter element without pressurizing the fluid.

In the preferred embodiment shown, the housing 11 is cylindrical with one end closed and the internal passage 112 is also cylindrical, and the open end of the housing 11, i.e., the left end in FIG. 1, is closed by the end cap 18. it should be understood that the housing 11 may be any shape so long as the internal passage 112 is defined therein. The inner passage 112 is also not limited to a cylindrical shape, but may have a cylindrical shape with other cross-sections, and may even have a curved or bent shape along the extending direction. In the preferred embodiment shown, the radial cross-sectional dimension of the interior passage 112 remains constant along its extent, but it should be understood that it may vary along its extent.

In the preferred embodiment shown, the internal passage 112 is closed along the entire circumference, but it should be understood that the internal passage 112 may be circumferentially unclosed, for example provided with an opening extending in the direction of extension of the internal passage 112. When the inner passage 112 is provided with an opening extending in the extending direction of the inner passage 112, the inner passage 112 extends substantially in the horizontal direction, and the opening is located above the inner passage 112 so that the liquid does not overflow from the opening when the liquid is contained in the inner passage 112. With the internal passage 112 sealed axially, the fluid particulate trap can be used to trap both target particulates in a liquid and target particulates in a gas. The following examples are described with reference to liquids, but it is understood that the examples are intended for the capture of particles in liquids, as well as for the capture of gas or liquid particles, such as solid particles, biological particles (e.g., cellular particles, protein particles, bacterial particles, viral particles, etc.), and fluids containing any particles that can be distinguished from pure fluids, without departing from the scope of the present invention.

The filter element 12 shown in fig. 1 is a filter membrane provided with filter pores, but it should be understood that the filter elements 12a-12d may be any structure provided with filter pores such that only particles smaller than the size of the filter pores can pass through the filter membrane when a liquid passes therethrough. Although four filter members 12a to 12d are shown in fig. 1, it is to be understood that the number of filter members is not limited to four, and may be set to different numbers as needed as long as the number of filter members is not less than two, and the sizes of the filter pores of the respective filter members 12a to 12d are different from each other. In the case where it is desired to separate three types of target particles from the fluid, two filter elements may be provided, with particles between the two filter elements having a size greater than the size of the pores of the two filter elements, and particles between one of the filter elements and one end of the internal passage 112 having a size less than one of the sizes of the pores of the two filter elements. In this case, a particularly precise enrichment of particles of intermediate size is possible. In the case of a need to separate virus from a fluid, a good enrichment is obtained by using two filtering elements 12.

In an application scene, the device can be used for detecting the COVID-19 new coronavirus, and for detecting the new coronavirus, an antigen test paper is mostly adopted for detecting the virus in a detection means of the new coronavirus, but when the virus concentration is lower, the virus is often difficult to display on the test paper, so that the detection sensitivity is not high, and further the detection result and subsequent operation are influenced.

More than two filter elements may be required for separating a greater variety of target particles from the fluid. For example, in the case of analysis of blood, it is preferred to employ more than two filters.

For the case where a particularly precise separation of two types of particles from a fluid is required, it is preferable to use a configuration of four filter elements 12a-12d shown in fig. 1 or more.

In use, a liquid containing target particles can be placed into the internal passage 112. Specifically, the housing 11 is provided with an inflow passage 113 between the two adjacent filter members 12a and 12b, and in order to control the inflow of the liquid through the inflow passage 113, an inflow control valve 114 may be further provided on the inflow passage 113 so that the liquid flows into between the two adjacent filter members 12a and 12 b. In order to prevent the liquid in the inner passage 112 from flowing back into the inflow passage 113, a check valve 17 is further provided in the inflow passage 113.

In the embodiment shown in fig. 1, the filter openings of the filter element 12a are relatively small. After the introduction of the liquid, the filter element 12a is moved to the right, so that the distance between the two adjacent filter elements 12a and 12b is reduced, thereby reducing the volume between them and promoting the flow of the liquid to both sides through the two adjacent filter elements 12a and 12 b. So that particles in the liquid having a size smaller than the size of the pores of the filter element 12a pass through the filter element 12a and collect on the left side of the filter element 12a, particles having a size smaller than the size of the pores of the filter element 12b pass through the filter element 12b and collect on the right side of the filter element 12b, and particles having a size larger than the sizes of the pores of the filter elements 12a and 12b collect between the filter elements 12a and 12 b. For liquids located between filter elements 12b and 12c, further processing may be similarly performed by moving filter element 12c, which has a smaller pore size than filter element 12b, to the left to collect particles therein in different regions.

In addition, at least one of the filter elements 12a-12d may be configured to move into and out of the internal passage 112 in a direction of extension of the internal passage 112. In particular use, end cap 18 may be removed and filter element 12a moved out of internal passage 112, and then the liquid may be introduced into internal passage 112 from the left, and then inserted between filter elements 12a and 12b after filter element 12a is moved in and end cap 18 is attached to the housing.

In the embodiment shown in fig. 1, each filter element 12 is coupled to a respective filter element drive 13 and is driven by the filter element drive 13 to move within the interior passage 112. Further, each filter element driving portion 13 communicates with the driving controller 14, and the driving movement thereof for the filter elements 12 is controlled by the driving controller 14. The filter drive may also include a motor that may be driven to the filter element 12 by a drive mechanism such as a rack and pinion assembly, a slide and rail assembly, a lead screw nut, or the like. For example, when a slider-slide assembly is used to drive the filter member 12, the slider-slide assembly can be used as a part of the filter member driving portion 13, and the filter member 12 is slidably connected to a slide rail provided in the housing through a slider, so that the filter member 12 can move along the extending direction of the internal passage 112. It should be understood that the filter element 12 may be driven manually without the use of a powered mechanism. It should be understood, however, that each filter element 12 may be driven in the internal passage 112 by any suitable means, and in the embodiments described below, the filter element driving portions are, respectively, push rods, threaded tubes and threaded rods connected to the filter elements and extending perpendicular to the filter elements.

Furthermore, in this embodiment, four outflow channels 115 are provided at the bottom of the internal channel 112, one outflow channel 115 being located on the left side of the filter element 12a, one outflow channel 115 being located on the right side of the filter element 12d, and two outflow channels 115 being located between the filter elements 12a and 12b and the filter elements 12b and 12c, respectively, so as to collect the respective target particle-enriched liquids enriched in the corresponding regions within the internal channel 112. The corresponding region may be the region between two adjacent filter elements or the region between a filter element and one end of the internal passage 112. It should be understood that the area corresponding to each outflow channel 115 and the relative position with respect to the four filter members 12 may vary depending on the position of the four filter members 12 within the internal channel 112. In the embodiment shown in fig. 1, two outflow control valves 116 are provided in each outflow channel 115, and an enrichment chamber 117 is provided between the two outflow control valves 116, so as to facilitate quantitative collection of liquid enriched in the respective target particles from the corresponding region of the internal channel 112. It is understood that the number and location of the outflow channels 115 may be set as desired, so long as it facilitates collection of the target particle-enriched liquid from the corresponding region of the inner channel 112. It should be understood that the liquid in the corresponding region of the interior passage 112 may be collected by other means, such as by pumping, etc.

Optionally, in the embodiment shown in fig. 1, a filter member vibrating device 15 is also provided in connection with each filter member 12, each filter member vibrating device 15 being capable of driving the corresponding filter member 12 to vibrate so as to promote the smooth passage of particles having a size smaller than the filter pores through the filter membrane without getting stuck in the filter pores of the filter membrane. Furthermore, a housing vibration device 16 is provided, which housing vibration device 16 is capable of driving the housing 11 into vibration, thereby promoting movement of particles in the liquid in the internal passage 112 and thus promoting passage of particles through the respective filter element 12. It will be appreciated that the vibrating device 15 may be provided only on the smaller bore filter element 12 to drive smaller particles through the smaller bore filter element 12, and larger particles may be vibrated through the larger bore filter element 12 by the housing. The filter vibrating device 15 and the housing vibrating device 16 may be mechanical vibrating devices, ultrasonic vibrating devices, or electromagnetic vibrating devices. The filter member vibrating device 15 may be provided integrally with the filter member driving portion 13 for the sake of simplification of the structure. To facilitate movement of particles within the liquid, an agitation device may also be provided within the interior passage 112. The filter member vibrating device and the stirring device can be applied to the following embodiments, and will not be described in detail hereinafter.

Figures 2a-2d show a device 2 for trapping particles in a liquid according to a second embodiment of the present invention. In this embodiment, the housing 21 is cylindrical and forms an internal passage 212, the internal passage 212 extends in a generally vertical direction and has an opening 24 at an upper end, and an upper section 2121 of the internal passage 212 is cylindrical, and a lower section 2122 of the internal passage 212 tapers downwardly from a lower end of the upper section 2121 such that the cross-section of the lower end of the internal passage 212 is smaller than the cross-section of the remainder of the internal passage 212. It should be understood, however, that the present invention is not limited thereto, and the inner passage 212 may be extended in a cylindrical shape as a whole, and the first filter member 22 is disposed in the inner passage 212, and the outer peripheral surface of the first filter member 22 is fixed to the inner wall 211 of the housing 21. In the embodiment shown in fig. 2a-2d, the first filter 22 is located at the bottom of the upper section 2121, but it should be understood that the first filter 22 may be located anywhere within the interior passage 212 as desired; the first filter element 22 may also be configured to move axially within the interior channel 212; the second filter element 23 has an outer peripheral surface sealed to the inner wall 211 of the housing 21 and axially slidable within the interior passage 212, and an axially extending push rod 25 is secured to the second filter element 23, the push rod 25 extending out of the housing 21 from an opening 24 at the upper end of the interior passage 212. In the embodiment shown in fig. 2, the push rod 25 of the second filter element 23 is an elongated rod perpendicular to the second filter element 23 and fixedly connected thereto, and a grip 28 is provided at the upper end of the elongated rod to push the elongated rod downward. It should be noted that in this embodiment, the cross-sectional shape of the upper section 2121 of the internal passage 212 and the shape of the second filter member 23 are not limited to circular, but may be provided in any shape as required.

The second filter element 23 can be moved axially in the inner channel 212 by pushing or pulling the push rod 25 axially. In this embodiment, the pore size of the second filter member 23 is smaller than that of the first filter member 22, the pore size of the second filter member 23 is smaller than that of the target particles, and the pore size of the first filter member 22 is larger than that of the target particles (also in the following embodiments, which will not be described later). Preferably, in order to facilitate collection of the liquid enriched with the target particles, a first control valve 26 may be provided between the upper section 2121 and the lower section 2122 to control on/off between the upper section 2121 and the lower section 2122, and a second control valve 27 may be provided at the bottom of the lower section 2122 to control on/off between the lower section 2122 and the outside.

Fig. 2a to 2d show a process of trapping an object using the trapping device for particles in a fluid of this embodiment. First, as shown in fig. 2a, the liquid is introduced into the internal passage 212, and then, as shown in fig. 2b, the second filter member 23 is pushed into the internal passage 212 from the opening 24 at the upper end of the internal passage 212 and the second filter member 23 is moved axially downward until it is spaced apart from the first filter member 22 by a predetermined distance, in which process particles having a size smaller than the pores of the second filter member 23 pass through the second filter member 23 into the liquid above the second filter member 23, so that particles having a size larger than the pores of the first filter member 22 are concentrated in the volume between the first filter member 22 and the second filter member 23. Then, as shown in fig. 2c, the first control valve 26 is opened, so that part of the liquid flows into the lower section 2122 and particles having a size smaller than the pores of the first filter 22 also flow into the lower section 2122. At this time, as shown in fig. 2d, the first control valve 26 is closed, and then the second control valve 27 is opened, so that the liquid enriched with the target particles flows out from the lower section 2122.

Alternatively, the second filter element 23 may have a pore size larger than the pore size of the first filter element 22, the first filter element 22 may have a pore size larger than the target particle size, and the second filter element 23 may have a pore size smaller than the target particle size, and in use, the second filter element 23 may be positioned at the bottom of the internal passageway 212, fluid may be introduced into the internal passageway 212, the second filter element 23 may be stretched a distance into the internal passageway 212, particles larger than the second filter element 23 may be concentrated above the second filter element 23, and particles larger than the first filter element 22 may be positioned between the second filter element 23 and the first filter element 22, the first control valve 26 may be opened, and fluid with the target particles may flow through the first filter element 22 into the lower section 2122. After completion of the trapping of the high concentration target particles contained in the lower section 2122, the second control valve 27 is opened to allow the liquid in the lower section 2122 to flow out.

Figures 3a-3d show a trapping device 3 for particles in a fluid according to a third embodiment of the present invention. This embodiment is the same as the embodiment of fig. 2a to 2d except that the push rod 25 connected to the second filter member is replaced with a threaded pipe 35 connected to the outer circumference of the second filter member 33, specifically, the threaded pipe 35 is externally provided with an external thread, and the inner wall 311 of the housing 31 is provided with an internal thread, the external thread of the threaded pipe 35 and the internal thread of the housing 31 being engaged with each other to facilitate the up-and-down movement of the threaded pipe 35; a grip portion 38 is provided at the top end of the threaded tube 35 to screw the threaded tube 35 into the inner passage 312; an opening is provided in the top of the threaded tube 35 to communicate with the outside to ensure that the air pressure above the liquid level does not increase as liquid enters the threaded tube 35.

Fig. 3a to 3d show a process of trapping target particles using the trapping device for particles in a fluid of this embodiment. This process is the same as that shown in fig. 2a-2d, except that the second filter member 33 is moved axially downward along the internal passage 312 by rotation of the threaded tube 35. It should be understood, however, that the axially downward movement of the second filter element 33 relative to the housing 31 may also be effected by an axially upward movement of the housing 31.

The resistance of the liquid to the second filter member 33 is large when the second filter member 33 is pushed axially downward in the internal passage 312 due to the flow resistance generated by the first filter member 32 and the second filter member 33 so that the liquid in the internal passage 312 passes through the second filter member 33, and in order to make it easier to push the second filter member 33 downward, the push rod 25 is replaced by the threaded pipe 35, and the force applied to the grip portion 38 can be significantly reduced as compared with directly pushing the second filter member 33 downward by converting the rotation on the threaded pipe 35 into the downward movement of the second filter member 33 through the engagement between the external thread on the threaded pipe 35 and the internal thread on the internal wall 311.

A trapping device 4 for particles in a fluid according to a fourth embodiment of the present invention is shown in fig. 4a and 4 b. This embodiment is the same as the embodiment of fig. 2a-2d, except that: the portions of the housing 41 defining the upper and

lower sections

4121, 4122 of the internal passage 412 are removably connected to one another, and the bottom of the lower section 4122 is not provided with an opening and a control valve; the housing 41 is provided with a detachably attached upper cover 46 and the push rod is replaced by a threaded rod 45, which threaded rod 45 passes through the upper cover 46 and is screwed with a nut 47 in the upper cover 46. Specifically, the housing 41 includes a first portion 413 defining an upper section 4121 of the internal passage 412 and a second portion 414 defining a lower section 4122 of the internal passage 412, the first and

second portions

413, 414 being removably coupled to one another via threads. In this embodiment, the upper section 4121 of the internal passage 412 is non-circular in cross-section. In the illustrated embodiment, the first portion 413 has a tubular shape and is externally threaded on an outer circumferential surface thereof, and the first filter member 42 is provided at a bottom of the first portion 413. It should be understood, however, that first filter element 42 may be disposed anywhere within first portion 413 as desired. The second part 414 is cylindrical having a bottom, and is provided with an internal thread at an inner circumferential surface, so that the first part 413 and the second part 414 can be fixedly coupled to each other by screwing. It should be understood, however, that the first portion 413 and the second portion 414 may be removably connected to each other in any other suitable manner, and that the second portion 414 may be shaped in any other suitable manner as desired, so long as its interior chamber is in communication with the interior chamber of the first portion 413. The upper cover 46 is positioned above the shell 41 and is detachably and fixedly connected with the shell 41; the upper cover 46 is tubular, and an inner peripheral surface thereof is provided with an internal thread; a nut 47 is arranged in the upper cover 46, the outer peripheral surface of the nut 47 is provided with an external thread to be meshed with the internal thread of the upper cover 46, the center of the nut 47 is provided with a threaded hole 471 provided with an internal thread, a threaded rod 45 fixedly connected with the second filtering piece 43 is provided with an external thread and is in threaded fit with the threaded hole 471 at the center of the nut 47, the cross section of the upper section 4121 of the internal channel 412 is a non-circular cross section, the threaded rod 45 cannot rotate in the upper section 4121, the nut 47 and the threaded rod 45 form a screw rod nut 47 structure, the rotating motion of the nut 47 can be converted into the axial motion of the threaded rod 45, the motion of the threaded rod 45 can be realized by rotating the nut 47, and the second filtering piece 43 is driven to move downwards. With this structure, the nut 47 can be turned with a smaller force than when the threaded rod 45 is directly pushed to move axially downward, thereby bringing the threaded rod 45 to move axially downward. Optionally, a driving device may be provided outside the upper cover 46 to drive the upper cover 46 to rotate, so as to drive the threaded rod 45 to move up and down.

To facilitate venting of gas from within the interior cavity of the second portion 414 when the first and

second portions

413, 414 are connected to each other, a vent tube and a vent valve 415 on the vent tube may be provided on the sidewall of the second portion 414. Optionally, a vent valve 415 is also provided near the upper end of the side wall of the first portion 413 to facilitate venting of gas from the interior of the first portion 413 when the upper cap 46 is attached to the first portion 413 and when the second filter element 43 is moved axially downward.

The process of trapping the target particles using the trapping device for particles in fluid of this embodiment is as follows: first fixedly connecting the first portion 413 to the second portion 414, then placing the liquid containing the target particles into the internal passage 412 of the housing 41, and then fixing the upper cover 46 to the first portion 413, the upper cover 46 having the nut 47 and the threaded rod 45 to which the second filter 43 is connected; the nut 47 is turned to drive the threaded rod 45 and thus the second filter element 43 to move axially downwards, so as to concentrate the particles with a size smaller than the size of the filter holes of the first filter element 42 in the cavity of the second part 414 and finally to remove the second part 414 from the first part 413, so as to obtain a liquid enriched with the target particles in the cavity of the second part 414 and a liquid enriched with particles with a size larger than the filter holes of the first filter element in the first part. Since the flow resistance of the first and

second filter members

42 and 43 is sufficiently large in the present invention, the liquid hardly leaks from the bottom of the first part 413 after the second part 414 is removed from the first part 413.

In fig. 5a and 5b a device 5 for trapping particles in a fluid according to a fifth embodiment of the present invention is shown. This embodiment is different from the embodiment shown in fig. 3 only in that the first portion 513 is composed of an upper half section 5131 and a lower half section 5132 which are screw-coupled to each other, while the inner circumferential surface of the upper half section 5131 is provided with an internal thread which is engaged with the external thread of the threaded pipe 54, and the portions of the upper section 5121 and the lower section 5122 of the housing 51 which define the internal passage 512 are detachably coupled to each other, and the bottom of the lower section 5122 is not provided with an opening and a control valve. Specifically, the housing 51 includes a first portion 513 defining an upper section 5121 of the internal passage 512 and a second portion 514 defining a lower section 5122 of the internal passage 512, the first portion 513 and the second portion 514 being removably coupled to one another by threads. To facilitate the evacuation of the gas from the cavity inside the second part 514 when the first part 513 and the second part 514 are connected to each other, an evacuation pipe and an evacuation valve 515 on the evacuation pipe are provided on the side wall of the second part 514. It should be understood that in the present embodiment, the connection manner between the upper half section 5131 and the lower half section 5132 is not limited to the threaded connection, but the detachable connection between the two can be realized by any suitable manner.

The process of trapping the target particles using the trapping device for particles in fluid of this embodiment is as follows: first, the first portion 513 is fixedly connected to the second portion 514, then the liquid containing the target particles is introduced into the internal passage 512 of the housing 51, the upper half and the lower half of the first portion 513 are fixedly connected, then the threaded tube 54 is rotated to drive the second filter member 53 axially downward to concentrate particles having a size smaller than the pore size of the first filter member 52 into the internal cavity of the second portion 514, and finally the second portion 514 is removed from the first portion 513 to obtain the liquid enriched with the target particles in the internal cavity of the second portion 514. Since the flow resistance of the first filter member 52 and the second filter member 53 is sufficiently large in the present invention, the liquid hardly leaks from the bottom of the first portion 513 after the second portion 514 is removed from the first portion 513.

A trapping device 6 for particles in a fluid according to a sixth embodiment of the present invention is shown in fig. 6. This embodiment differs from the embodiment shown in fig. 4a and 4b in that no nut is provided in the upper cover 67, only the threaded hole 671 is provided, and the housing 61 is composed of a first portion 613, a second portion 614 and a third portion 615 which are axially detachably connected in sequence, while the internal passage 612 is also divided into an upper section 6121, a middle section 6122 and a lower section 6123 which are defined by the first portion 613, the second portion 614 and the third portion 615, respectively. In the illustrated embodiment, the first portion 613, the second portion 614 and the third portion 615 are connected to one another by threads, but it should be understood that they may be removably connected by other means. Specifically, the bottom portions of the outer circumferential surfaces of the

first portions

613 and 614 are provided with external threads, respectively, and the inner circumferential surfaces of the second portions 614 and the third portions 615 are provided with corresponding internal threads, respectively. In the embodiment shown in fig. 6a, the length of each external thread is greater than the length of the engaged internal thread, such that the volume of the internal cavities of the second portion 614 and the third portion 615 may be adjusted by the threaded connection between the portions.

Wherein the first filtering element 62 is arranged at the bottom of the second portion 614 and the second filtering element 63 moves axially inside the upper sector 6121 formed by the first portion 613. In this embodiment, the upper cover 67 is removably connected to the housing 61 by threads, but it should be understood that the upper cover 67 and the housing 61 may be removably connected by other means. In order to sealingly connect the first portion 613, the second portion 614 and the third portion 615 to each other,

grooves

6131 and 6141 are provided in the bottom end faces of the first portion 613 and the second portion 614, respectively, and sealing rings are provided in the

grooves

6131 and 6141, respectively. Fig. 6b and 6c show bottom views of the second portion 614 and the third portion 615. As shown in fig. 6b, the bottom end face of the second part 614 is provided with a groove 6131. As shown in fig. 6c, the bottom end face of the third portion 615 is provided with a groove 6141. And the bottom of the third section 615 is provided with a support bracket 6152 for supporting the first filter 62. In use, the upper cap 67 and the second filter member 63 are first removed, the liquid is placed in the first portion 613, the upper cap 67 is then attached to the housing and the second filter member 63 is simultaneously moved into the upper section 6121. By rotating the holding portion 68 at the top of the threaded rod 65, the threaded rod 65 and the second filtering element 63 are driven to move axially downward in the upper section 6121. Optionally, a driving device may be disposed outside the upper cover 67 to drive the upper cover 67 to rotate, so as to drive the threaded rod 45 to move up and down.

With this structure, the grip portion 68 can be rotated with a smaller force than when the threaded rod 45 is directly pushed to move axially downward, thereby bringing the threaded rod 65 into axial downward movement. Thereby concentrating particles having a size smaller than the pore size of the first filter element 62 into the interior cavity of the third section 615, particles having a size smaller than the second filter element 63 into the interior cavity of the first section 613, and particles having a size larger than the first and

second filter elements

62, 63 into the interior cavity of the second section 614. Finally, the third portion 615 is removed from the second portion 614 and the second portion 614 is removed from the first portion 613, so as to obtain in the three portions a liquid enriched respectively with the corresponding particles. Since the flow resistance of the first and

second filter members

62 and 63 is sufficiently large in the present invention, the liquid hardly leaks from the bottom of the first part 613 after the second part 614 is removed from the first part 613; and after the third portion 615 is removed from the second portion 614, little liquid will escape from the bottom of the second portion 614.

Fig. 7a-7f illustrate the mating relationship between the filter element and the internal passage. The filter element 12a and the internal passage 112 of the embodiment of fig. 1 are illustrated as examples. As shown in fig. 7a, the outer circumferential surface of the filter element 12a is provided with a circumferentially extending sealing ring 121, which sealing ring 121 forms a sealing engagement between the filter element 12a and the inner wall 111. As shown in fig. 7a, the outer circumferential surface of the seal ring 121 is provided with two radial protrusions 1211 spaced apart from each other in the axial direction. It is understood that the number of radial protrusions 1211 may be greater, as desired. In the embodiment shown in fig. 7a, the projection 1211 is circular in shape, but it should be understood that the axial cross-section of the projection 1211 may be provided in other shapes, such as, for example, a projection 1211 having an axial thickness that decreases radially outward to reduce the contact area with the inner wall 111. By means of the two radial projections 1211, the contact area of the inner wall 111 of the internal passage 112 of the sealing ring 121 is reduced, so as to reduce the resistance between the two during the movement of the filtering element 12a inside the internal passage 112, while ensuring the sealing engagement between the filtering element 12a and the inner wall 111. As also shown in fig. 7a, filter element 12a includes a filter membrane 122 and a support shelf 123 at the upper end of filter membrane 122. The support frame 123 is used for supporting the filtering membrane 122, in the embodiment shown in the figure, the support frame 123 is cylindrical, and the support frame 123 is provided with through parts, the total area of the through parts is significantly larger than the total area of the filtering holes of the filtering membrane 122, so that the support frame 123 does not obstruct the liquid flowing through the filtering membrane 122. It is understood that the support frame 123 may be configured in any other shape as long as it can support the filtering membrane 122 without deformation during movement. The filtering membrane 122 may also be mounted to the support bracket 123 in other ways, such as in the embodiment shown in FIG. 7b, where the support bracket 123 is located at the lower end of the filtering membrane; whereas in the embodiment shown in fig. 7c the inner periphery of the sealing ring 121 is sealingly connected to the outer periphery of the filter membrane 122. Preferably, the outer circumference of the filtering membrane 122 may be directly bonded to the inner circumference of the sealing ring 121. It should be understood that it is also possible to provide that an axial end face of the sealing ring 121 and an axial end face of the filter membrane 122 are bonded to each other, so that a sealed connection is achieved therebetween.

In the embodiment of fig. 7d-f, the radial dimension of the outer peripheral surface of the sealing ring 121 is axially constant, i.e. cylindrical, while the inner wall 111 is provided with annular protrusions 1111 that are evenly spaced apart from each other in the axial direction and extend circumferentially. The distance between adjacent annular protrusions 1111 is smaller than the axial length of the sealing ring 121, thereby ensuring that the sealing ring 121 is always in sealing contact with at least two annular protrusions 111.

In the embodiment shown in fig. 7g-7i, the outer peripheral surface and the inner wall 111 of the sealing ring 121 are provided with a radial projection 1211 and an annular projection 1111, respectively. Wherein the sealing ring 121 is provided with two axially spaced radial protrusions 1211. In this case, the axial distance between the adjacent projections 1111 is smaller than the axial distance between the axially upper end of the upper radial projection 1211 and the axially lower end of the lower radial projection 1211 on the seal ring 121, that is, the axial length occupied by the radial projection 1211. Thereby ensuring that at least one radial projection 1211 makes sealing contact with the annular projection 1111. It should be understood, however, that the sealing ring 121 may also be provided with a greater number of axially spaced radial projections 1211, in which case the axial distance between adjacent projections 1111 should be less than the axial length between the axially upper end of the uppermost projection 1211 and the axially lower end of the lowermost projection 1211 of the sealing ring 121, so as to ensure that at least one radial projection 12 is always present during the movement of the filter element11 are in sealing contact with the annular protrusion 1111. FIG. 7j is a partial enlarged view of the area B in FIG. 7g, and as shown in FIG. 7j, two adjacent annular protrusions 1111 have axial lengths D₁And D₃And the axial distance between two adjacent annular protrusions 1111 is D₂(ii) a The two radial protrusions 1211 have axial lengths L, respectively₁And L₃And the axial distance between two radial protrusions 1211 is L₂. Wherein at L₁>D₂And L is₃>D₂In the case where the axial length of any one of the radial projections 1211 is greater than the axial distance between two adjacent annular projections 1111, it is further ensured that at least one radial projection 1211 is in sealing contact with the annular projection 1111 at all times during movement of the filter member. At D₁>L₂And D₃>In the case of L2, i.e., any one of the annular projections 1111 has an axial length greater than the axial distance between adjacent ones of the radial projections 1211, it is ensured that at least one of the radial projections 1211 is brought into sealing contact with the annular projection 1111 all the time during movement of the filter member even if the size of the outer peripheral surface of the radial projection 1211 varies in the axial direction.

The embodiment of fig. 8a-8f is identical to the embodiment of fig. 7a-7f, except that the seal ring 221 is formed with at least one circumferentially extending annular groove 22111 in the axial middle of the radial projection 2211 to further reduce the contact area of the seal ring 221 with the inner wall, and fig. 8g is a partial enlarged view of the radial projection 2211, wherein two annular grooves 22111 are provided around the periphery of the radial projection 2211, and each annular groove 22111 is in line contact with the inside to greatly reduce the resistance to movement of the filter element 12a, as shown in fig. 8 g. The embodiment of fig. 8d-8f is identical to the embodiment of fig. 7g-7h, except that the radial projection 2211 formed on the seal ring 221 is provided with a circumferentially extending annular groove 22111 at an axially intermediate portion thereof to further reduce the area of contact between the seal ring 221 and the inner wall.

Although the filter element 12a is illustrated in fig. 7a-7i and fig. 8a-8f, it should be understood that the above-described sealing structure is applicable to all embodiments of the present invention.

Figures 9a-9e show a trapping device 9 for particles in a fluid according to a seventh embodiment of the present invention. As in the embodiment of fig. 2a-2d, the housing 91 is cylindrical and forms an internal passage 912, the internal passage 912 extending in a generally vertical direction and having an opening at an upper end; disposed within the interior channel 912 of the housing 91 is a first filter element 92, the first filter element 92 being secured to the interior wall of the housing. In the illustrated embodiment, the first filter element 92 is secured to the lower end of the internal passage 912. The outer peripheral surface of the second filter member 93 is sealed with the inner wall 911 of the housing 91 and can slide along the extending direction of the inner channel 912, the upper end of the second filter member 93 is provided with a push rod 95, and the push rod 95 extends perpendicular to the second filter member 93 and can push the second filter member 93 to move; the pore size of the first filter member 92 is larger than that of the second filter member 93. This embodiment differs from the embodiment of fig. 2a-2d in that an outflow channel is provided at one end of the internal channel 912, in which the valve 96 is provided. In use, the second filter member 93 is first moved out of the upper end of the internal passage 912, then liquid is introduced into the internal passage 912, and then the second filter member 93 is pushed axially downwardly until it is spaced a predetermined distance from the first filter member 92, during which particles having a size smaller than the pores of the second filter member 93 pass through the second filter member 93 into the liquid above the second filter member 93, so that particles having a size larger than the pores of the first filter member 92 are accumulated in the volume between the first and

second filter members

92 and 93; the valve 96 is then opened to continue the downward axial movement of the second filter member 93 until it is spaced a smaller predetermined distance from the first filter member 92, whereupon particles having a size smaller than the pore size of the first filter member 92 flow with the liquid through the first filter member 92 and out the outflow passage to obtain a liquid enriched with the particles. After the valve 96 is opened, the second filter element 93 can also be moved axially downward until it comes into contact with the first filter element 92. It will be appreciated that the process of urging the second filter member 93 downwardly axially before the valve 96 is opened may be staged, and that the downward axial movement of the second filter member 93 is not limited to the downward translational movement of the second filter member 93, in order to be driven by less force

The second filter member 93 moves downward, and the second filter member 93 can rotate about the axis while moving downward. It will also be appreciated that during the downward axial movement of the second filter member 93 upon opening of the valve 96 to cause particles having a size smaller than the pore size of the first filter member 92 to flow with the liquid through the first filter member 92 and out of the liquid path, the second filter member 93 may be urged downwardly in stages to collect the liquid enriched in such particles into a different container.

The present invention also provides a method of trapping particulates in a fluid using the device for trapping particulates in a fluid of the present invention, specifically, the method includes placing a fluid containing a plurality of particulates between a pair of adjacent filter members of a plurality of filter members in an internal passageway, and moving one of the pair of adjacent filter members toward the other filter member or moving one of the pair of adjacent filter members toward the other filter member to bring the pair of adjacent filter members closer together to reduce the volume therebetween, such that the fluid passes through the pair of adjacent filter members toward either side under pressure, respectively, such that particulates in the fluid having a size smaller than the size of pores of one of the pair of adjacent filter members are located on a side of the one filter member facing away from the other filter member, and particulates having a size larger than the size of pores of the two filter members of the pair of adjacent filter members are located between the pair of adjacent filter members, so that a fluid in which particles of different sizes are collected is obtained in the regions on both sides of the pair of filter members and in the region between the pair of filter members, respectively. In the preferred embodiment, when one of the pair of adjacent filter elements is moved, the filter element moved is one having a smaller filter opening size. It is also preferred that one of the pair of adjacent filter elements is movable into and out of one end of the internal passage so that the filter element can be moved into the internal passage by moving the filter element out of one end of the internal passage to place fluid into the internal passage and then moving the filter element into the internal passage to effect placement of fluid containing a plurality of particles between the pair of adjacent filter elements in the internal passage.

While the preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.

These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

Claims

1. An apparatus for trapping particles in a fluid, comprising:

a housing having an inner wall defining an interior passage;

a plurality of filter elements positioned within the internal passage and spaced apart from each other along a direction of extension of the internal passage, at least a portion of an outer periphery of each of the filter elements sealingly engaging the inner wall, at least one of the filter elements being movable along the direction of extension of the internal passage;

2. The apparatus of claim 1, wherein the internal channel has an opening at one end, and further comprising an end cap removably coupled to the housing and closing the opening.

3. The apparatus according to claim 1, wherein an end of the internal passage is provided with an opening, and the at least one filter element is movable into and out of the end of the internal passage.

4. The apparatus according to claim 1 or 3, wherein the at least one filter element is a plurality of filter elements having the smallest pore size.

5. The apparatus according to claim 1, wherein the internal passage is a circumferentially closed passage, and the entire periphery of at least one of the filter elements is in sealing engagement with the inner wall.

6. An apparatus according to claim 5, wherein the entire periphery of at least one of the filter elements is provided with a circumferentially extending sealing ring forming a sealing engagement between the at least one filter element and the inner wall of the housing.

7. The apparatus of claim 6, wherein the seal ring has an outer peripheral surface with a radial dimension that varies in an axial direction.

8. The apparatus of claim 7, wherein the outer circumferential surface of the sealing ring is provided with at least one radial protrusion.

9. An apparatus according to claim 8, wherein at least one of the radial projections is provided with a circumferentially extending annular groove at an axially intermediate portion thereof.

10. The apparatus according to claim 6, wherein the outer peripheral surface of the sealing ring has a constant radial dimension in the axial direction, the inner wall is provided with annular protrusions that are uniformly spaced apart from each other in the axial direction and extend in the circumferential direction, and the axial distance between two adjacent annular protrusions is smaller than the axial length of the sealing ring.

11. The apparatus according to claim 6, wherein the outer peripheral surface of the sealing ring is provided with at least two radial protrusions spaced apart from each other in the axial direction, the inner wall is provided with annular protrusions spaced apart from each other uniformly in the axial direction and extending in the circumferential direction, and an axial distance between adjacent two of the annular protrusions is smaller than an axial length occupied by the radial protrusions of the sealing ring.

12. The apparatus of claim 11, wherein the axial distance between two adjacent annular protrusions is less than the axial length of any radial protrusion of the sealing ring.

13. The apparatus according to claim 11, wherein the outer peripheral surface of the sealing ring is provided with at least two radial protrusions spaced apart from each other in the axial direction, and the inner wall is provided with annular protrusions spaced apart from each other uniformly in the axial direction and extending in the circumferential direction, and an axial length of any one of the annular protrusions is greater than an axial distance between adjacent radial protrusions of the sealing ring.

14. The apparatus according to claim 6, wherein the filter member comprises a support frame and a filter membrane, and the support frame is located at one axial end of the filter membrane.

15. The apparatus according to claim 6, wherein the filter element is a filter membrane, and the sealing ring is sealingly connected to the filter membrane.

16. The apparatus according to claim 15, wherein an inner periphery of the sealing ring is bonded to an outer periphery of the filter membrane.

17. The apparatus according to claim 15, wherein an axial end face of the seal ring is bonded to an axial end face of the filter membrane.

18. The apparatus according to claim 14, wherein the support frame is provided with axial through-holes, and the total area of the through-holes is larger than the total area of the filter holes of the filter membrane.

19. The apparatus according to claim 1, wherein the internal passage is cylindrical, the at least one of the at least some filter elements has an external thread on an outer circumference thereof, and the internal wall has an internal thread engaged with the internal thread, and the internal thread has a length greater than a length of the external thread.

20. The apparatus according to claim 1, wherein a nut is provided in the housing, an outer peripheral surface of the nut is provided with an external thread that engages with the internal thread of the inner wall, the nut is further provided with a threaded hole, and the at least one filter member is coupled to a threaded rod that is threadedly engaged with the threaded hole of the nut.

21. The apparatus according to claim 19, wherein the at least one filter element is connected to a threaded pipe having external threads that engage the internal threads of the inner wall.

22. The apparatus of claim 1, wherein the internal channel is cylindrical.

23. The apparatus according to claim 1, wherein the plurality of filter elements is two filter elements.

24. The apparatus according to claim 23, wherein the internal passage has a cylindrical shape, and wherein the two filter members include a first filter member having a larger pore size than a pore size of the second filter member, the first filter member being fixed to one end of the internal passage, and a second filter member being provided so as to be movable in an extending direction of the internal passage.

25. The apparatus according to claim 24, wherein the second filter element is coupled to a push rod extending perpendicular to the second filter element.

26. The apparatus of claim 24, wherein the one end of the internal channel is provided with an outflow channel, and a valve is disposed in the outflow channel.

27. The apparatus according to claim 24, wherein the second filter element is configured to move into and out of the other end of the internal passage.

28. The apparatus according to claim 1, wherein at least two of the plurality of filter elements are located in segments having different radial cross-sectional areas.

29. The apparatus according to claim 28, wherein at least one of the plurality of filter elements has a radial cross-sectional area of a segment that is between 0.01 and 50 times a radial cross-sectional area of a segment that is at least one other of the plurality of filter elements.

30. The apparatus of claim 1, further comprising at least one of: a stirring device located within the internal passage, a vibrating device located within the internal passage, and a housing vibrating device.

31. The apparatus according to claim 1, comprising a filter vibrating device coupled to and driving at least one of the plurality of filter elements to vibrate.

32. The apparatus according to claim 1, wherein at least one pair of adjacent filter elements of the plurality of filter elements have filter openings sized larger and smaller than, respectively, the size of at least one particle in the fluid.

33. The apparatus according to claim 23, wherein the two filter elements have filter openings sized larger and smaller than, respectively, at least one of the particles in the fluid.

34. The apparatus according to claim 23, wherein the filter member having the smaller filtration pore of the two filter members is connected to a push rod extending perpendicularly to the filter members.

35. The apparatus according to claim 33, wherein said housing is divided in an elongated direction into a first section, a middle section and a tail section which are detachably connected end to end, wherein two of said filter members having smaller openings are axially movable in said first section, and wherein two of said filter members having larger openings are fixed to ends of said middle section adjacent to said tail end, and wherein said tail end of said tail section is closed.

36. The apparatus of claim 34, further comprising an end cap removably attached to the housing and closing one end of the internal passage, the end cap having a threaded bore therethrough, the push rod being a threaded rod, the threaded bore being in threaded engagement with the threaded rod.

37. The apparatus according to claim 1, further comprising a filter drive portion coupled to the at least one of the plurality of filter elements and configured to drive the at least one filter element in a direction along which the internal passage extends.

38. The apparatus according to claim 37, further comprising a control device in communication with the filter drive and controlling the drive of the at least one filter by the filter drive.

39. The apparatus according to claim 37, wherein the drive portion is a push rod coupled to one of the at least one filter member, the push rod extending perpendicular to the one of the at least one filter member.

40. The apparatus according to claim 1, further comprising an inflow channel disposed on the inner wall, the inflow channel being located between a pair of adjacent filter elements of the plurality of filter elements.

41. The apparatus of claim 40, wherein a one-way valve is disposed in the inflow channel, the one-way valve allowing fluid flow only toward the internal channel.

42. The apparatus according to claim 40, further comprising an outflow channel disposed on the inner wall, the outflow channel being located between at least one adjacent pair of the plurality of filter elements or at an end of the internal channel.

43. The apparatus according to claim 33, wherein two of the filter elements are secured to the inner wall with an opening at the bottom of the internal passage between the filter elements.

44. The apparatus of claim 1, wherein at least one end of the internal channel in the direction of extension has a cross-sectional dimension that is smaller than the cross-sectional dimension of the remaining portion.