Filtering sample bottle

Abstract

The utility model provides a filter sample introduction bottle, it includes outer tube and inner tube, the inner tube has the import end and export end along the axial arrangement, import end inserts into the outer tube, the outer periphery side of inner tube is provided with first sealing element, first sealing element and the inner periphery side sealed cooperation of outer tube, the lateral wall of inner tube is provided with exhaust hole, exhaust hole sets up in first sealing element export end one side close to and communicates with atmospheric pressure, and exhaust hole is located in the outer tube. By setting up exhaust hole in sealing element export end one side close to, ensure in the filtering process, the inner tube inside through exhaust hole is always in communication with the atmospheric environment, eliminates the pressure rise of outer tube inside because of the inner tube depression, thereby guarantees the smooth operation of filtering process, avoids the risk of sample introduction quantity inaccuracy, filter membrane pressure breakage and liquid leakage from the interface because of the pressure difference between inside and outside.

Description

Technical Field

[0001] This utility model relates to the field of sample pretreatment technology, and in particular to a filter injection bottle. Background Technology

[0002] In sample pretreatment processes for chemical analysis, biological detection, and environmental monitoring, it is often necessary to filter liquid samples to remove impurities. Currently, laboratories commonly use a combination device of a syringe and a detachable filter. When using this device, the sample is first drawn into the syringe, then the filter is installed, and the sample flows out after being filtered through the filter membrane by pushing the syringe plunger.

[0003] However, this traditional filtration method has inherent drawbacks: towards the end of the filtration process, as the sample volume in the syringe decreases, the force required to push the plunger increases significantly. This can lead to leakage or detachment at the filter-syringe connection due to increased internal pressure, potentially causing sample splashing and occupational exposure risks for operators. More importantly, this sudden increase in internal pressure can impact the filter membrane, posing a risk of membrane rupture or separation from the support, resulting in filtration failure. Simultaneously, unstable internal pressure directly leads to uneven filtration flow rates, causing fluctuations in the volume or concentration of collected filtrate. This results in poor precision and parallelism of analytical data from continuous injections, severely impacting the accuracy and reliability of test results. Furthermore, at the moment the syringe is removed, due to the internal and external pressure difference, some unfiltered sample or filtrate may be drawn back to the filter interface, leading to cross-contamination when the same filter is used for different samples.

[0004] To address these issues, integrated flash filtration vials have emerged on the market. These typically consist of an inner tube inserted into an outer tube, which engages with the inner wall of the outer tube via a sealing structure. However, when using such devices, as the inner tube is continuously inserted, the air inside the outer tube is compressed, creating a pressure higher than the external environment. This pressure difference hinders smooth sample filtration, resulting in a slow and incomplete filtration process. This also affects the collection efficiency and consistency of the filtrate, consequently impacting the accuracy of subsequent detection data. Furthermore, at the moment filtration is complete, the release of high-pressure gas can create an aerosol impact on the filter membrane and the filtrate collected at the bottom of the vial, posing a risk of contamination. While some existing designs incorporate venting structures, their placement is often inappropriate. For example, they may be positioned below the sealing structure or prematurely submerged by the sample liquid surface during filtration. This causes the venting function to fail during critical filtration stages, preventing the dynamic and effective balancing of pressure inside and outside the vial throughout the filtration process. Therefore, these designs fail to fundamentally solve the problem of inaccurate and non-parallel injection data caused by pressure fluctuations. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defect that the exhaust structure of the flash filter sample bottle in the prior art cannot effectively exhaust air throughout the filtration process, thus affecting the validity of subsequent monitoring data, and to provide a filter sample bottle.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] A filtration sample inlet bottle includes an outer tube and an inner tube. The inner tube has an inlet end and an outlet end arranged axially. The inlet end is inserted into the outer tube. A first sealing element is provided on the outer circumference of the inner tube. The first sealing element seals against the inner circumference of the outer tube. An exhaust hole is provided on the side wall of the inner tube. The exhaust hole is located on the side of the first sealing element near the outlet end and is in communication with atmospheric pressure. The exhaust hole is located inside the outer tube.

[0008] In this technical solution, by placing the vent hole on the side of the seal near the outlet end, it is ensured that the inner tube remains connected to the atmospheric environment through the vent hole during the filtration process. This effectively eliminates the pressure increase inside the outer tube caused by the downward pressure of the inner tube, thus ensuring the smooth progress of the filtration process and avoiding the risks of inaccurate sample injection, filter membrane damage due to pressure differences, and liquid leakage from the interface caused by internal and external pressure differences. Simultaneously, this structure prevents the vent hole from being submerged by unfiltered sample liquid during the filtration process, thereby effectively preventing sample leakage or contamination through the vent hole while maintaining pressure balance throughout the process.

[0009] Meanwhile, by ensuring the distance between the vent and the inlet is less than the axial depth of the outer tube, it is guaranteed that the vent remains located at the top of the outer tube's internal cavity throughout the entire insertion stroke of the inner tube. This ensures the venting channel remains effective from start to finish, achieving dynamic pressure balance throughout the process and further improving the stability and precision of filtration and subsequent sample injection data. Furthermore, this design ensures the vent is always surrounded and protected by the outer tube wall during filtration and storage, isolating it from external environmental contaminants and preventing accidental blockage or contamination. This balances pressure while maintaining the cleanliness of the apparatus and the accuracy of the results.

[0010] Preferably, the filtration injection bottle further includes a filter membrane and a fixing assembly, the filter membrane being disposed within the fixing assembly, the fixing assembly being installed at the inlet end, and the filter membrane being supported against the side of the fixing assembly facing the inlet end.

[0011] In this technical solution, a robust filtration unit is formed by abutting and supporting the filter membrane against the fixed component, which facilitates overall installation and replacement and effectively prevents the filter membrane from breaking or deforming under pressure.

[0012] Preferably, the fixing component includes a support member and a mounting member, both of which are inserted into the inner tube. The support member has a hollow structure that extends axially through the tube. The filter membrane is disposed between the support member and the mounting member, and the filter membrane is disposed on the side of the support member facing the inlet end.

[0013] In this technical solution, the hollow structure provides an unobstructed flow channel for the filtrate, minimizing filtrate residue and pressure loss.

[0014] Preferably, the inner circumferential side of the inlet end has an inwardly recessed annular groove, and both the support member and the mounting member are embedded in the annular groove.

[0015] In this technical solution, the annular groove facilitates the installation and fixation of the support component.

[0016] Preferably, a slot is provided on the inner circumference of the inner tube, and a buckle matching the slot is provided on the mounting component. The inner tube and the mounting component are engaged by the buckle and the slot.

[0017] In this technical solution, the fixing component is fixed to the inner tube by the interlocking structure of the buckle and the slot, which realizes the rapid, accurate positioning and reliable installation of the filter membrane, and avoids the chemical contamination that may be introduced by the use of adhesives, ensuring the purity of the sample, and ensuring that the filter membrane will not shift or fall off due to liquid pressure during use.

[0018] Preferably, the support member is a mesh structure or a structure with multiple support ribs.

[0019] Preferably, the bottom of the outer tube is provided with an upwardly protruding positioning structure, which is inserted into the mounting component.

[0020] In this technical solution, the axial positioning of the filter membrane assembly is achieved by the positioning structure at the bottom of the outer tube in conjunction with the fixing component, ensuring that it is in the optimal working position and guaranteeing proper filtration.

[0021] Preferably, the top of the positioning structure abuts against the filter membrane.

[0022] Preferably, a second sealing element is also provided on the outer circumferential side of the inner tube, the second sealing element being in sealing cooperation with the inner circumferential side of the outer tube, and the second sealing element being disposed between the first sealing element and the inlet end along the axial direction.

[0023] In this technical solution, by setting a second sealing element, multiple axially spaced sealing elements are formed on the outer periphery of the inner tube, creating a unique multi-stage sealing and single-point venting structure. The sealing element prevents the unfiltered sample from rising, ensuring the cleanliness of the area between the outer wall of the inner tube and the inner wall of the outer tube above the vent hole. Thus, after filtration, this area can be used directly as a clean gripping area for operation, avoiding contamination of the filtered sample by unfiltered sample residues during disassembly or operation.

[0024] Preferably, there are multiple vent holes, which are located at the same height of the inner tube, and / or the multiple vent holes are evenly distributed along the circumference of the inner tube.

[0025] In this technical solution, by setting multiple vent holes, venting failure caused by accidental blockage of a single vent hole can be avoided, greatly improving the reliability and stability of the device. At the same time, multiple vent holes can accelerate the pressure equalization process, making the filtration operation smoother.

[0026] The significant advantages of this invention are as follows: By placing the vent hole on the side of the seal near the outlet end, it ensures that the inner tube remains connected to the atmospheric environment throughout the filtration process. This effectively eliminates the pressure increase inside the outer tube caused by the downward pressure of the inner tube, thus guaranteeing smooth filtration and avoiding risks such as inaccurate sample volume, filter membrane damage due to pressure differences, and liquid leakage from the interface. Simultaneously, this structure prevents the vent hole from being submerged by unfiltered sample liquid during filtration, thereby effectively preventing sample leakage or contamination through the vent hole while maintaining pressure balance throughout the process. Attached Figure Description

[0027] Figure 1 This is a schematic diagram (I) of the structure of a filter injection bottle according to an embodiment of the present invention.

[0028] Figure 2 for Figure 1 Enlarged schematic diagram of part A in the middle.

[0029] Figure 3 This is a schematic diagram (II) of the structure of a filter injection bottle according to an embodiment of the present invention.

[0030] Figure 4 This is a schematic diagram of the outer tube structure according to an embodiment of the present invention.

[0031] Figure 5 This is a schematic diagram of the inner tube structure according to an embodiment of the present invention.

[0032] 100 filtration sample vials

[0033] Outer tube 1

[0034] Positioning Structure 11

[0035] Inner tube 2

[0036] First sealing element 23

[0037] Second seal 24

[0038] First protrusion 25

[0039] Exhaust port 201

[0040] Filter membrane 3

[0041] Fixed component 4

[0042] Support component 41

[0043] Mounting part 42

[0044] 5 bottle caps

[0045] Second protrusion 51

[0046] Gasket 6 Detailed Implementation

[0047] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0048] like Figures 1-5 As shown, this embodiment provides a filter injection bottle, which includes an outer tube 1 and an inner tube 2. The inner tube 2 has an inlet end and an outlet end arranged axially. The inlet end is inserted into the outer tube 1. A first sealing element 23 is provided on the outer periphery of the inner tube 2, which seals against the inner periphery of the outer tube 1. A vent hole 201 is provided on the side wall of the inner tube 2. The vent hole 201 is located on the side of the first sealing element 23 near the outlet end and is connected to atmospheric pressure. The vent hole 201 is located inside the outer tube 1. By placing the vent hole 201 on the side of the sealing element near the outlet end, it is ensured that the interior of the outer tube 1 is always connected to the atmospheric environment through the vent hole 201 during the filtration process. This effectively eliminates the pressure increase inside the outer tube 1 caused by the downward pressure of the inner tube 2, thereby ensuring the smooth progress of the filtration process and avoiding the risks of inaccurate injection volume, pressure damage to the filter membrane 3, and liquid leakage from the interface caused by the pressure difference between the inside and outside. Meanwhile, this structure prevents the vent 201 from being submerged by the unfiltered sample liquid during the filtration process, thus effectively preventing the sample from leaking or being contaminated through the vent 201 while balancing the pressure throughout the process.

[0049] Meanwhile, by ensuring that the distance between the vent hole 201 and the inlet end is less than the axial depth of the outer tube 1, it is guaranteed that the vent hole 201 remains located at the upper part of the internal cavity of the outer tube 1 throughout the entire insertion stroke of the inner tube 2 into the outer tube 1. This ensures that the venting channel remains effective from the start to the end of filtration, achieving dynamic pressure balance throughout the process and further improving the stability and precision of filtration and subsequent sample injection data. Furthermore, this positioning design ensures that the vent hole 201 is always surrounded and protected by the wall of the outer tube 1 during filtration and storage, isolating it from contaminants in the external environment and preventing accidental blockage or contamination. This balances pressure while ensuring the cleanliness of the device and the accuracy of the results.

[0050] Specifically, the filtration sample bottle also includes a filter membrane 3 and a fixing component 4. The filter membrane 3 is disposed inside the fixing component 4, which is installed at the inlet end. The filter membrane 3 is supported against the side of the fixing component 4 facing the inlet end. By supporting the filter membrane 3 against the fixing component 4, a robust filtration unit is formed, which facilitates overall installation and replacement and effectively prevents the filter membrane 3 from breaking or deforming under pressure.

[0051] The fixing component 4 includes a support member 41 and a mounting member 42, both of which are inserted into the inner tube 2. The support member 41 has an axially penetrating perforated structure. The filter membrane 3 is disposed between the support member 41 and the mounting member 42, and is positioned on the side of the support member 41 facing the inlet end. The perforated structure provides an unobstructed flow path for the filtrate, minimizing filtrate residue and pressure loss.

[0052] Of course, in other embodiments, the mounting component 42 may not be provided, and the filter membrane 3 may be directly fixed on the support component 41, which will not be described in detail here.

[0053] Specifically, the support member 41 can be a mesh structure or a structure with multiple support ribs. When the support member 41 is a structure with multiple support ribs, the support ribs are evenly spaced along the circumference of the support member 41.

[0054] in, Figure 1 This is a structural diagram of the filtration sample bottle during the filtration process. Figure 3 This is a schematic diagram of the filter injection bottle after filtration is completed.

[0055] In this embodiment, the inner circumferential side of the inlet end has an inwardly recessed annular groove, in which both the support member 41 and the mounting member 42 are embedded. The annular groove facilitates the installation and fixation of the support member 41.

[0056] Specifically, a groove is provided on the inner circumference of the inner tube 2, and a buckle matching the groove is provided on the mounting component 42. The inner tube 2 and the mounting component 42 are engaged by the buckle and the groove. The fixing component 4 is fixed to the inner tube 2 by the interlocking structure of the buckle and the groove, which realizes the rapid, accurate positioning and reliable installation of the filter membrane 3, avoids the chemical contamination that may be introduced by the use of adhesives, ensures the purity of the sample, and ensures that the filter membrane 3 will not shift or fall off due to liquid pressure during use.

[0057] Of course, in other embodiments, a buckle can be provided on the inner tube 2 and a slot can be provided on the mounting part 42 to achieve the buckle engagement between the inner tube 2 and the mounting part 42. In more embodiments, the mounting part 42 can also be fixed by other fixing methods in the prior art, such as bonding, etc., which will not be described in detail here.

[0058] Meanwhile, the bottom of the outer tube 1 is provided with an upwardly protruding positioning structure 11, which is inserted into the mounting component 42. Through the cooperation of the positioning structure 11 at the bottom of the outer tube 1 and the fixing component 4, the filter membrane 3 assembly is axially positioned, ensuring it is in the optimal working position and guaranteeing proper filtration. Furthermore, the top of the positioning structure 11 abuts against the filter membrane 3.

[0059] In this embodiment, a second sealing element 24 is also provided on the outer periphery of the inner tube 2. The second sealing element 24 is in sealing engagement with the inner periphery of the outer tube 1. Along the axial direction, the second sealing element 24 is disposed between the first sealing element 23 and the inlet end. By providing the second sealing element 24, the outer periphery of the inner tube 2 has multiple axially spaced sealing elements, forming a unique structure of multi-stage sealing and single-point venting. The sealing element can prevent the unfiltered sample from rising, ensuring the cleanliness of the area between the outer wall of the inner tube 2 and the inner wall of the outer tube above the vent hole 201. Thus, after filtration, this area can be used directly as a clean gripping area for operation, avoiding contamination of the filtered sample by the unfiltered sample residue during disassembly or operation.

[0060] Specifically, in this embodiment, the number of second seals 24 is one.

[0061] Of course, in other embodiments, the number of second seals 24 can also be set to two, three, etc., which will not be elaborated here.

[0062] Meanwhile, there can be multiple vent holes 201, which are located at the same height in the inner tube 2 and are evenly distributed along the circumference of the inner tube 2. By setting multiple vent holes 201, venting failure caused by accidental blockage of a single vent hole 201 can be avoided, greatly improving the reliability and stability of the device. At the same time, multiple vent holes 201 can accelerate the pressure equalization process, making the filtration operation smoother.

[0063] Specifically, in this embodiment, there are two exhaust holes 201, which are symmetrically arranged on the side wall of the inner tube 2.

[0064] Of course, in other embodiments, the number of exhaust holes 201 can be set as needed according to the size of the exhaust volume, which will not be elaborated here.

[0065] In this embodiment, all first seals 23 have a barb structure. Specifically, the upper surface of the first seal 23 is horizontal, and the lower surface is radially inclined downward from the outside to the inside. The axial section of the second seal 24 is semi-circular.

[0066] Meanwhile, in this embodiment, the inner diameter of the open end of the outer tube 1 is larger than the inner diameter of the bottom of the outer tube 1, and the inner diameter of the outer tube 1 gradually decreases along the direction toward the bottom of the outer tube 1.

[0067] In this embodiment, the filter injection bottle also includes a bottle cap 5 and a gasket 6. The gasket 6 is disposed inside the bottle cap 5. The outer periphery of the inner tube 2 has two first protrusions 25 spaced apart along the axial direction. A groove is formed between the two first protrusions 25. The bottle cap 5 is provided with a second protrusion 51 corresponding to the groove. The second protrusion 51 is embedded in the groove.

[0068] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A filtration sample inlet bottle, comprising an outer tube and an inner tube, the inner tube having an inlet end and an outlet end arranged axially, the inlet end being inserted into the outer tube, characterized in that, The inner tube is provided with a first sealing element on its outer circumference. The first sealing element is sealed to the inner circumference of the outer tube. The inner tube is provided with an exhaust hole on its side wall. The exhaust hole is located on the side of the first sealing element near the outlet end and is connected to atmospheric pressure. The exhaust hole is located inside the outer tube.

2. The filtration sample bottle as described in claim 1, characterized in that, The filtration sample bottle also includes a filter membrane and a fixing assembly. The filter membrane is disposed within the fixing assembly, which is installed at the inlet end. The filter membrane is supported against the side of the fixing assembly facing the inlet end.

3. The filtration sample bottle as described in claim 2, characterized in that, The fixing component includes a support member and a mounting member, both of which are inserted into the inner tube. The support member has a hollow structure that extends axially. The filter membrane is disposed between the support member and the mounting member, and the filter membrane is supported against the side of the fixing component facing the inlet end.

4. The filtration sample bottle as described in claim 3, characterized in that, The inner circumferential side of the inlet end has an inwardly recessed annular groove, and both the support member and the mounting member are embedded in the annular groove.

5. The filtration sample bottle as described in claim 3, characterized in that, The inner circumference of the inner tube is provided with a slot, and the mounting component is provided with a buckle that matches the slot. The inner tube and the mounting component are engaged by the buckle and the slot.

6. The filtration sample bottle as described in claim 3, characterized in that, The support member is a mesh structure or a structure with multiple support ribs.

7. The filtration sample bottle as described in claim 3, characterized in that, The bottom of the outer tube is provided with an upwardly protruding positioning structure, which is inserted into the mounting component.

8. The filtration sample bottle as described in claim 7, characterized in that, The top of the positioning structure abuts against the filter membrane.

9. The filtration sample bottle as described in claim 1, characterized in that, A second sealing element is also provided on the outer circumference of the inner tube. The second sealing element is in sealing cooperation with the inner circumference of the outer tube. Along the axial direction, the second sealing element is disposed between the first sealing element and the inlet end.

10. The filtration sample bottle as described in claim 1, characterized in that, The number of vent holes is multiple, and the multiple vent holes are located at the same height of the inner tube, and / or the multiple vent holes are evenly distributed along the circumference of the inner tube.

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