CN221038889U - Sampling assembly and chromatograph detector - Google Patents
Sampling assembly and chromatograph detector Download PDFInfo
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- CN221038889U CN221038889U CN202322852159.3U CN202322852159U CN221038889U CN 221038889 U CN221038889 U CN 221038889U CN 202322852159 U CN202322852159 U CN 202322852159U CN 221038889 U CN221038889 U CN 221038889U
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- 238000005070 sampling Methods 0.000 title claims abstract description 334
- 210000002445 nipple Anatomy 0.000 claims description 7
- 230000001154 acute effect Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 16
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 241000309551 Arthraxon hispidus Species 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model provides a sampling assembly and a chromatographic detector, wherein the sampling assembly comprises: the sampling joint is internally provided with a sampling needle tube channel for the passage of a sampling needle tube, and is of a deformable structure; the adaptor is internally provided with a sampling channel, the sampling channel comprises a sampling joint accommodating section and a sampling needle tube accommodating section which are sequentially communicated in the direction of a sampling flow path of the sampling channel, and the sampling needle tube channel is communicated with the sampling needle tube accommodating section; the sampling joint is connected to the adapter, and the sampling joint is arranged in the sampling joint accommodating section, and the head end of the sampling joint is propped against the wall surface of the sampling needle tube accommodating section, so that the head end of the sampling joint is in an inward shrinking shape, and the sampling channel at the head end of the sampling joint is in a closing-in shape. The position of the sampling needle tube at the head end of the sampling joint can be extruded by the sampling joint, so that the air tightness of the joint between the sampling needle tube and the sampling joint is improved, and the reliability requirement of quantitative detection in chromatographic detection is met.
Description
Technical Field
The utility model relates to the field of chromatographic detection, in particular to a sampling assembly and a chromatographic detector.
Background
In the related art, during chromatographic detection, an automatic sampler which is convenient and efficient is generally adopted for sampling. As the requirements for sample detection increase, the demands for quantitative detection are also increasing.
The joint between the sampling needle joint of the automatic sampler and the sampling joint generally has a gap, so that air leakage exists between the sampling needle joint and the sampling joint, and thus the reliability requirement of quantitative detection cannot be met when a sample is extracted.
Disclosure of utility model
The present utility model provides a sampling assembly and a chromatographic detector to improve at least one of the above problems.
The utility model achieves the above object by the following technical scheme.
In a first aspect, the present utility model provides a sampling assembly for use in a chromatographic detector, comprising: the sampling joint is internally provided with a sampling needle tube channel for the passage of a sampling needle tube, and is of a deformable structure; the adapter is internally provided with a sampling channel, the sampling channel comprises a sampling joint accommodating section and a sampling needle tube accommodating section which are sequentially communicated in the direction of a sampling flow path of the sampling channel, and the sampling needle tube channel is communicated with the sampling needle tube accommodating section; the sampling joint is connected to the adapter, and the sampling joint is located in the sampling joint accommodating section, the head end of the sampling joint is propped against the wall surface of the sampling needle tube accommodating section, so that the head end of the sampling joint is in an inward shrinking shape, and a sampling channel located at the head end of the sampling joint is in a closing-in shape.
In some embodiments, the head end of the sampling joint is cone-shaped, on the axis of the cone, the head end of the sampling joint has a cone angle a, the wall surface of the end of the sampling channel is cone-shaped, on the axis of the cone, the wall surface of the end of the sampling channel has a cone angle b;
Wherein the taper angle a > taper angle b.
In some embodiments, the sampling needle further comprises a sampling needle tube positioned in the sampling needle tube accommodating section and the sampling needle tube channel, wherein the sampling needle tube is of a deformable structure, and the sampling needle tube is positioned at the head end of the sampling connector and is propped against the inner wall of the sampling needle tube channel;
The outer diameter of the sampling needle tube at the accommodating section of the sampling needle tube is larger than the outer diameter of the sampling needle tube at the head end of the sampling joint.
In some embodiments, the sampling needle has a second end opposite the first end, the sampling needle having an outer diameter that gradually increases in a direction of the second end toward the first end, the direction of the second end toward the first end being in the same direction as the sampling flow path direction of the sampling needle.
In some embodiments, the sampling connector has a tail end disposed opposite the head end, the tail end being located outside the adapter, the tail end being in the shape of a regular hexagon, or the tail end being in the shape of a square.
In some embodiments, the sampling nipple is threadably connected to the adapter, and the threaded portion of the sampling nipple is located in the sampling channel.
In some embodiments, the adapter further defines an extension tube channel in communication with the sampling channel, and the sampling assembly further comprises an extension tube connected to the adapter by an extension tube connector, the extension tube in communication with the sampling needle tube;
the external pipe joint and the sampling joint have the same structure.
In some embodiments, the outer adapter and the sampling needle tube are disposed at an angle that is either a right angle or an acute angle.
In some embodiments, the outer surface of the adapter comprises two clamping surfaces which are oppositely arranged, wherein the clamping surfaces are plane, the two clamping surfaces are parallel, or the two clamping surfaces are in a clamping angle shape;
and/or, the adapter is square.
In a second aspect, the present utility model also provides a chromatographic detector having the sampling assembly described above.
In the sampling assembly and the chromatographic detector with the sampling assembly, the sampling assembly comprises the sampling joint and the adapter, and the head end of a sampling needle tube channel in the sampling joint is in a closing-in shape through the tight connection of the sampling joint and the adapter so as to resist the sampling needle tube in the channel.
That is, the sampling joint is pressed through the adapter, the sampling joint is pressed against the sampling needle tube, so that tight connection between the adapter and the sampling joint and between the sampling joint and the sampling needle tube is realized, no gap is formed between the adapter and the sampling joint and between the sampling joint and the sampling needle tube to prevent gas circulation, and the air tightness between the adapter and the sampling joint and between the sampling joint and the sampling needle tube is improved, so that gas inside the sampling needle tube is not easy to leak from the joint between the adapter and the sampling joint, and the reliability of quantitative detection in chromatographic detection is met.
The position that the sampling needle tube is located the sampling joint head end can receive the extrusion that the sampling connects to be the indent form, in order to guarantee the zonulae occludens between sampling needle tube and the sampling joint head end, thereby make two zonulae occludens's position department can hinder the gas circulation, realize improving the effect of junction gas tightness between the two, make the inside gas of sampling needle tube be difficult for leaking outward from the junction between the two, in order to satisfy the reliability requirement of quantitative determination in the chromatographic detection.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram showing a split structure of a sampling assembly according to an embodiment of the present utility model;
FIG. 2 is a schematic view showing a part of the structure of a sampling joint according to an embodiment of the present utility model;
FIG. 3 illustrates a cross-sectional view of an adapter provided by an embodiment of the present utility model;
FIG. 4 shows a cross-sectional view of the connection locations between the sampling needle cannula, sampling adapter and adapter provided by an embodiment of the present utility model.
Reference numerals illustrate:
101. Sampling needle tube; 201. a sampling joint; 301. an adapter; 401. an outer connecting pipe; 501. and (5) connecting an external pipe joint.
Detailed Description
In order to make the present utility model better understood by those skilled in the art, the following description of the present utility model will be made in detail with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which a person skilled in the art would obtain without making any inventive effort, are within the scope of the utility model.
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
Referring to fig. 1 to 4, the present utility model provides a sampling assembly for a chromatographic detector, which includes a sampling connector 201 and an adapter 301, and the head end of a channel of a sampling needle tube 101 in the sampling connector 201 is in a convergent shape by tightly connecting the sampling connector 201 and the adapter 301 so as to press the sampling needle tube 101 in the channel.
That is, the adaptor 301 is pressed against the sampling connector 201 and the sampling connector 201 is pressed against the sampling needle tube 101, so that tight connection between the adaptor 301 and the sampling connector 201 and between the sampling connector 201 and the sampling needle tube 101 are realized, so that no gap exists between the adaptor 301 and the sampling connector 201 and between the sampling connector 201 and the sampling needle tube 101 to obstruct gas circulation, and further the air tightness between the adaptor 301 and the sampling connector 201 and between the sampling connector 201 and the sampling needle tube 101 is improved.
Wherein the sampling adaptor 201 defines a sampling needle 101 passageway therein through which the sampling needle 101 passes, the sampling needle 101 being capable of passing through the sampling needle 101 passageway to be mounted on the sampling adaptor 201 when assembled.
The sampling joint 201 is of a deformable structure, the sampling joint 201 can be a rubber part, a plastic part or other material parts capable of realizing deformation, so that the sampling joint 201 can deform under the action of external force, and in the scheme, the sampling joint 201 can be propped against the adaptor 301 when being mounted on the adaptor 301, so that the head end of the sampling joint 201 is inwards contracted to be deformed into an inwards contracted shape.
Wherein, the adaptor 301 defines a sampling channel therein, the sampling channel includes a sampling connector accommodating section and a sampling needle tube accommodating section which are sequentially communicated in a sampling flow path direction of the sampling channel, and the sampling needle tube 101 channel is communicated with the sampling needle tube accommodating section.
The sampling connector 201 is connected to the adaptor 301, and the sampling connector 201 is located in the sampling connector accommodation section.
When assembling the sampling needle tube 101, the sampling needle tube 101 is firstly penetrated into the sampling needle tube 101 channel of the sampling connector 201, and the end part of the sampling needle tube 101 enters the sampling needle tube accommodating section of the adapter 301, and then the sampling connector 201 is mounted on the adapter 301, so that the head end of the sampling connector 201 is positioned in the sampling connector accommodating section, and the integral assembly of the sampling assembly is realized.
In the process of installing the sampling connector 201 into the adaptor 301, the head end of the sampling connector 201 will abut against the wall surface of the sampling connector accommodating section of the adaptor 301, so that the head end of the sampling connector 201 is deformed.
That is, in the assembled state, the head end of the sampling connector 201 is pressed against the wall surface of the accommodating section of the sampling needle tube, the head end of the sampling connector 201 is in a retracted shape, and the sampling channel located at the head end of the sampling connector 201 is in a closed shape.
Like this, the position that sampling needle tube 101 is located sampling joint 201 head can receive sampling joint 201's extrusion to be the shrink form, in order to guarantee the zonulae occludens between sampling needle tube 101 and the sampling joint 201 head, make two zonulae occludens's position department can hinder the gas circulation, thereby realize improving the gas tightness of junction between them, make the inside gas of sampling needle tube 101 be difficult for leaking outward from the junction between them, in order to satisfy the reliability requirement of quantitative determination in the chromatographic detection.
In some embodiments of the present disclosure, the head end of the sampling joint 201 may be tapered, with the head end of the sampling joint 201 having a taper angle a on the axis of the taper.
In order to facilitate the cooperation of the sampling adaptor 201 and the wall surface of the sampling adaptor receiving section, the wall surface of the sampling adaptor receiving section may also be tapered, and the wall surface at the end of the sampling channel may have a taper angle b on the axis of the taper, wherein the taper angle a > the taper angle b.
It can be appreciated that through the design that the cone angle a > the cone angle b, the cooperation of the sampling connector 201 and the wall surface of the accommodating section of the sampling connector is more stable, and more importantly, the head end of the sampling connector 201 has a larger deformation effect as much as possible, so that the sampling connector 201 is more tightly matched with the wall surface of the accommodating section of the sampling connector, and meanwhile, the head end of the sampling connector 201 is further retracted, so that the connection tightness between the sampling connector and the sampling needle tube 101 is improved, and the gas inside the sampling needle tube 101 is not easy to leak from the joint between the sampling needle tube and the sampling needle tube, so as to meet the reliability requirement of quantitative detection in chromatographic detection.
In some embodiments of the present solution, the sampling assembly of the present solution further comprises a sampling needle 101 positioned in the sampling needle receiving section and the sampling needle 101 channel.
The sampling needle tube 101 is of a deformable structure, for example, the sampling needle tube 101 can be a rubber part, a plastic part or other material parts capable of realizing deformation, so that the sampling needle tube 101 can deform under the action of external force, and in the scheme, the sampling needle tube 101 can be propped against the sampling connector 201 when being installed on the sampling connector 201, so that the part of the sampling needle tube 101 at the head end of the sampling connector 201 is deformed inwards to form a contracted shape.
It will be appreciated that in the assembled state, the sampling needle tube 101 is located at the head end of the sampling connector 201 and abuts against the inner wall of the channel of the sampling needle tube 101, and at this time, the outer diameter of the sampling needle tube 101 located at the accommodating section of the sampling needle tube is larger than the outer diameter of the sampling needle tube 101 located at the head end of the sampling connector 201.
That is, in the assembled state, the head end of the sampling connector 201 is pressed against the wall surface of the accommodating section of the sampling needle tube, the head end of the sampling connector 201 is in a retracted shape, and the sampling channel located at the head end of the sampling connector 201 is in a closed shape.
Like this, the position that sampling needle tube 101 is located sampling joint 201 head can receive sampling joint 201's extrusion, is the shrink form to guarantee the zonulae occludens between sampling needle tube 101 and the sampling joint 201 head, thereby both zonulae occludens's position department can hinder the gas circulation, thereby improves the gas tightness of junction between the two, makes the inside gas of sampling needle tube 101 be difficult for leaking outward from the junction between the two, in order to satisfy the reliability requirement of quantitative determination in the chromatographic detection.
In order to further ensure the connection reliability and air tightness of the sampling needle tube 101 in the adapter 301, and ensure that the sampling needle tube 101 is not easily detached from the sampling connector 201 during the installation process, in some practical embodiments of the present solution, the sampling needle tube 101 has a second end opposite to the first end, and in a direction of the second end toward the first end, the outer diameter of the sampling needle tube 101 is gradually increased, and a direction of the second end toward the first end is in the same direction as the sampling flow path direction of the sampling needle tube 101.
During assembly of sampling adapter 201 into adapter 301, the outer diameter of sampling syringe 101 at the head end of sampling adapter 201 is larger, i.e., the strength of the connection between sampling syringe 101 at this point and the head end of sampling adapter 201 is higher than the strength of the connection between sampling syringe 101 at other points and sampling adapter 201.
Therefore, in the assembly process, the connection between the sampling needle tube 101 and the head end of the sampling connector 201 always maintains high connection strength, so that the sampling needle tube 101 is not easy to fall off from the sampling connector 201 in the process.
Meanwhile, the tight connection between the sampling needle tube 101 and the head end of the sampling connector 201 is ensured, so that the gas circulation can be blocked at the position of the tight connection of the sampling needle tube 101 and the head end, the gas tightness of the joint between the sampling needle tube 101 and the head end is improved, and the gas inside the sampling needle tube 101 is not easy to leak from the joint between the sampling needle tube 101 and the head end, so that the reliability requirement of quantitative detection in chromatographic detection is met.
In some prior art, the tail end of the sampling connector 201 is generally cylindrical, which is disadvantageous for the use of common tools (e.g., clamps, wrenches), and increases the difficulty and efficiency of the disassembly and assembly of the sampling connector 201.
To facilitate the disassembly and assembly of the sampling connector 201, in some embodiments of the present disclosure, the sampling connector 201 has a tail end disposed opposite to the head end, the tail end is located outside the adaptor 301, and the tail end is in a regular hexagon shape or a square shape.
In this manner, it is convenient to use common tools (e.g., clamps, wrenches) when removing or assembling the sampling joint 201, thereby increasing the difficulty and efficiency of removing and assembling the sampling joint 201.
To improve the stability and convenience of installation between sampling connector 201 and adapter 301, in some embodiments of the present disclosure, sampling connector 201 is threaded to adapter 301 and the threaded portion of sampling connector 201 is located in the sampling channel.
In this way, the connection portion between the sampling connector 201 and the adaptor 301 is located inside the adaptor 301, so that the stability of the connection portion can be effectively ensured, and the connection portion is not easily interfered or damaged by external objects.
Meanwhile, the connection between the two is realized by adopting a threaded connection mode, so that the stability of the connection between the two can be improved.
In some embodiments of the present disclosure, the adapter 301 further defines an outer tube 401 communicating with the sampling channel, and the sampling assembly further includes an outer tube 401 connected to the adapter 301 through an outer tube connector 501, where the outer tube 401 communicates with the sampling needle 101, so as to enable the gas to be measured to circulate from the sampling needle 101 to the outer tube 401.
The external pipe joint 501 and the sampling joint 201 have the same structure.
It can be appreciated that, through the same design of the external pipe joint 501 and the sampling joint 201, on the one hand, the sampling joint 201 and the external pipe joint 501 can adopt the same mold opening mode, and the manufacturing of different mold opening modes is not needed, so that the manufacturing cost can be saved, and meanwhile, the universality of the two modes is also facilitated.
More importantly, the external pipe joint 501 can also achieve the same technical effect as the sampling joint 201, and the tightness and stability can be improved as well, and the technical effect of the sampling joint 201 is already described in the above scheme and will not be repeated here.
In some embodiments of the present solution, the extension tube 401 and the sampling needle tube 101 are disposed at an angle that is either a right angle or an acute angle.
In order to facilitate clamping of adaptor 301 during disassembly or assembly, in some embodiments of the present disclosure, the outer surface of adaptor 301 includes two clamping surfaces disposed opposite to each other, the clamping surfaces being planar, the two clamping surfaces being parallel, such that the wrench can facilitate clamping of adaptor 301 to ensure that during disassembly or assembly, the wrench can stably clamp adaptor 301 to achieve efficient installation or disassembly.
In still other embodiments of the present disclosure, the two clamping surfaces may be formed into an included angle, preferably an acute angle, so that the clamp can be used to clamp the adaptor 301 conveniently, so as to ensure that the clamp can stably clamp the adaptor 301 during the process of disassembly or assembly, so as to achieve efficient assembly or disassembly.
In still other embodiments of the present disclosure, adapter 301 is square, so that a wrench can be used to clamp adapter 301 conveniently, so that in the process of disassembly or assembly, the wrench can clamp adapter 301 stably, and efficient assembly or disassembly can be achieved.
In a second aspect, an embodiment of the present utility model further provides a chromatographic detector, which has the sampling assembly described above. The specific structure of the sampling assembly refers to the above embodiments, and because the chromatograph detector adopts all the technical schemes of all the embodiments, the chromatograph detector also has all the beneficial effects brought by the technical schemes of the embodiments, and the details are not repeated here.
In the present utility model, the terms "mounted," "connected," and the like should be construed broadly unless otherwise specifically indicated or defined. For example, the connection can be fixed connection, detachable connection, integral connection or transmission connection; may be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for understanding as a specific or particular structure. The description of the term "some embodiments" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In the present utility model, the schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples of the present utility model and features of various embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting thereof; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and they should be included in the protection scope of the present utility model.
Claims (10)
1. A sampling assembly for use with a chromatographic detector, comprising:
The sampling joint is internally provided with a sampling needle tube channel for the passage of a sampling needle tube, and is of a deformable structure; and
The sampling device comprises a switching piece, wherein a sampling channel is defined in the switching piece, the sampling channel comprises a sampling joint accommodating section and a sampling needle tube accommodating section which are sequentially communicated in the sampling flow path direction of the sampling channel, and the sampling needle tube channel is communicated with the sampling needle tube accommodating section;
The sampling joint is connected to the adapter, and the sampling joint is located in the sampling joint accommodating section, the head end of the sampling joint is propped against the wall surface of the sampling needle tube accommodating section, so that the head end of the sampling joint is in an inward shrinking shape, and a sampling channel located at the head end of the sampling joint is in a closing-in shape.
2. The sampling assembly of claim 1, wherein the sampling nipple has a tapered head end with a taper angle a on the axis of the taper, and the sampling nipple receiving section has a tapered wall with a taper angle b on the axis of the taper;
Wherein the taper angle a > taper angle b.
3. The sampling assembly of claim 1, further comprising a sampling needle in the sampling needle receiving section and the sampling needle passageway, the sampling needle being of a deformable construction, the sampling needle being located at the sampling nipple head end and being in abutment with an inner wall of the sampling needle passageway;
The outer diameter of the sampling needle tube at the accommodating section of the sampling needle tube is larger than the outer diameter of the sampling needle tube at the head end of the sampling joint.
4. The sampling assembly of claim 1, wherein the sampling needle has a second end opposite the first end, the sampling needle having an outer diameter that gradually increases in a direction toward the first end, the direction toward the first end being in the same direction as the sampling flow path of the sampling needle.
5. The sampling assembly of claim 1, wherein the sampling connector has a trailing end disposed opposite a leading end, the trailing end being external to the adapter, the trailing end being in the shape of a regular hexagon or the trailing end being in the shape of a square.
6. The sampling assembly of claim 1, wherein the sampling nipple is threadably coupled to the adapter and the threaded portion of the sampling nipple is located in the sampling channel.
7. The sampling assembly of any one of claims 1 to 6, wherein the adapter further defines an extension tube passage therein in communication with the sampling passage, the sampling assembly further comprising an extension tube connected to the adapter by an extension tube connector, the extension tube in communication with the sampling needle cannula;
the external pipe joint and the sampling joint have the same structure.
8. The sampling assembly of claim 7, wherein the extension tube and the sampling needle tube are disposed at an angle that is either a right angle or an acute angle.
9. The sampling assembly of any one of claims 1 to 6, wherein the outer surface of the adapter comprises two oppositely disposed gripping surfaces, the gripping surfaces being planar, the gripping surfaces being parallel, or the gripping surfaces being angled;
and/or, the adapter is square.
10. A chromatographic detector having a sampling assembly as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322852159.3U CN221038889U (en) | 2023-10-24 | 2023-10-24 | Sampling assembly and chromatograph detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322852159.3U CN221038889U (en) | 2023-10-24 | 2023-10-24 | Sampling assembly and chromatograph detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221038889U true CN221038889U (en) | 2024-05-28 |
Family
ID=91174496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322852159.3U Active CN221038889U (en) | 2023-10-24 | 2023-10-24 | Sampling assembly and chromatograph detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221038889U (en) |
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2023
- 2023-10-24 CN CN202322852159.3U patent/CN221038889U/en active Active
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