Sampling needle placing rack and headspace sample injector

Abstract

The utility model discloses a sampling needle placing rack and a headspace sample injector, a sampling needle comprises a flow guide pipe and a needle head connected to the end part of the flow guide pipe, and the sampling needle placing rack comprises a mounting plate, a fixing plate and a positioning plate. The fixing plate is connected to one side of the mounting plate, the fixing plate is provided with a fixing convex column, and the fixing convex column is provided with a containing groove for allowing the needle head to be inserted therein. The two positioning plates are connected to the fixed plate and located above the convex column of the fixed plate, the two positioning plates are arc-shaped plates, the arcs are arranged in the opposite directions in an arc bending mode, and the inner side walls of the two positioning plates can abut against the outer wall of the flow guide pipe so that the sampling needle can be positioned and placed.

Description

TECHNICAL FIELD

[0001] The utility model relates to analytical instrument technical field, especially take a kind of sampling needle rack and headspace sampler. BACKGROUND

[0002] The headspace sampler is commonly used analytical instrument in laboratory, and is mainly used for extracting volatile components from airtight container for gas chromatography analysis. The sampling needle, as a key component of the headspace sampler, is usually composed of a flow guide tube and a needle head connected to the end of the flow guide tube, and is used for accurately extracting samples. In actual operation, the sampling needle needs to be properly placed after sampling to avoid damage, pollution or injury to the operator. However, the existing sampling needle storage method often has the problems of unstable fixation, easy falling or large space occupation, which affects the experimental efficiency and safety. SUMMARY

[0003] The utility model aims at at least solving one of the technical problems existing in the prior art. To this end, the utility model provides a sampling needle rack, aiming to provide a compact and stable sampling needle storage device, to ensure the safety and convenience of the sampling needle during storage.

[0004] According to the first aspect embodiment of the utility model's sampling needle rack, the sampling needle includes a flow guide tube and a needle head connected to the end of the flow guide tube, and the sampling needle rack includes a mounting plate, a fixed plate and a positioning plate. The fixed plate is connected to one side of the mounting plate, and the fixed plate is provided with a fixed convex column, and the fixed convex column is provided with a placing groove for inserting the needle head. The positioning plate is provided with two, and the two positioning plates are connected to the fixed plate and located above the fixed plate convex column. The two positioning plates are arc-shaped plates, and the arc-shaped plates are curved towards opposite directions. The inner side walls of the two positioning plates can abut against the outer wall of the flow guide tube to position and place the sampling needle.

[0005] According to the sampling needle placing rack, the following beneficial effects are achieved: the mounting plate is used as a basic supporting component of the whole placing rack, and is used for fixing the placing rack to a headspace sampler or other suitable positions; the connecting plate is connected to one side of the mounting plate, and is used for providing a main supporting structure of the sampling needle; the fixing plate is provided with a fixing protruding column, the fixing protruding column is designed with a placing groove, the shape and size of the placing groove are matched with the needle head of the sampling needle, the needle head is allowed to be inserted into the placing groove, and preliminary positioning and fixing are achieved; the two positioning plates are connected to the fixing plate and located above the fixing protruding column of the fixing plate; the two positioning plates are arc-shaped plates, and the arc shapes are arranged in opposite directions, so that an envelope of the flow guide pipe is formed; the inner side walls of the two positioning plates can be tightly abutted against the outer wall of the flow guide pipe, the sampling needle is further positioned and fixed through physical contact, and the sampling needle is prevented from shaking or falling off during storage; not only the stable storage of the sampling needle is achieved, but also the occupied space is reduced through reasonable space layout, and the neatness and work efficiency of the laboratory are improved; meanwhile, the stability of the sampling needle during storage is ensured through the double fixing of the fixing protruding column and the positioning plate, and the falling or damage of the sampling needle due to shaking or external force is avoided.

[0006] According to some embodiments of the utility model, two positioning plates are connected to a limiting plate, the limiting plate is located on the side close to the fixing protruding column, and the limiting plate is clamped to the outer wall of the connecting part of the flow guide pipe and the needle head to limit the sampling needle from being separated.

[0007] According to some embodiments of the utility model, the end of the limiting plate is provided with a limiting notch, and the limiting notch is arc-shaped to match the shape of the outer wall of the connecting part.

[0008] According to some embodiments of the utility model, the fixing plate is provided with a fixing rod, and one side of the positioning plate is sleeved on the fixing rod.

[0009] According to some embodiments of the utility model, the upper and lower ends of the fixing rod are provided with limiting bosses, and the upper and lower side walls of the positioning plate are respectively abutted against the two limiting bosses.

[0010] According to some embodiments of the utility model, the fixing rod is sleeved with a limiting spring, one end of the limiting spring is connected to the limiting boss, and the other end is abutted against the positioning plate.

[0011] According to some embodiments of the utility model, the placing groove is a tapered groove with a gradually decreasing inner diameter from top to bottom.

[0012] According to some embodiments of the utility model, the placing groove is filled with an elastic soft material.

[0013] According to some embodiments of the present application, the fixing plate and the mounting plate are arranged perpendicularly to each other, so as to be clamped on one side of the top of the headspace sampler.

[0014] According to the headspace sampler of the first aspect of the present application, the sampling needle rack is as any one of the above.

[0015] According to the headspace sampler of the present application, the sampling needle rack is integrated, the headspace sampler can provide a more stable and safe sampling operation environment, and the experimental efficiency and accuracy are improved.

[0016] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present application will be further described below in combination with the drawings and embodiments, wherein:

[0018] Figure 1 is a schematic view of the sampling needle rack of the present application;

[0019] Figure 2 is a cross-sectional schematic view of the sampling needle rack of the present application after the needle is placed;

[0020] Figure 3 is a schematic view of the headspace sampler of the present application.

[0021] Reference signs: sampling needle rack 100; mounting plate 110; fixing plate 120; fixing convex column 130; placing groove 131; positioning plate 140; limiting plate 141; limiting notch 142; fixing rod 150; limiting boss 151; limiting spring 152; sampling needle 200; flow guide pipe 210; needle 220; connecting part 230; headspace sampler 300. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0023] In the description of the utility model, need understanding is, if the direction description, for example, the direction or positional relation of indication such as upper, lower, front, back, left, right is based on the direction or positional relation shown in drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply the device or element indicated must have a particular orientation, with a particular orientation configuration and operation, therefore can not be understood as the restriction of the utility model.

[0024] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number.If there is a description to the first, second is only used for distinguishing technical features for the purpose, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0025] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.In the description of the utility model, the description of reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model.In the description of the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.In the description of the present application, the description of reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model.In the description of the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0026] Referring to Figure 1 And Figure 2The utility model provides a sampling needle placing rack 100, wherein the sampling needle 200 comprises a flow guide pipe 210 and a needle head 220 connected to the end of the flow guide pipe 210, and the sampling needle placing rack 100 comprises a mounting plate 110, a fixed plate 120 and a positioning plate 140. The fixed plate 120 is connected to one side of the mounting plate 110, and the fixed plate 120 is provided with a fixed convex column 130 provided with a placing groove 131 for accommodating the insertion of the needle head 220. The positioning plate 140 is provided with two, both of which are connected to the fixed plate 120 and are located above the convex column of the fixed plate 120. Both of the positioning plates 140 are arc-shaped plates, and the arcs are arranged in opposite directions. The inner side walls of both of the positioning plates 140 can abut against the outer wall of the flow guide pipe 210 to position and place the sampling needle 200.

[0027] In a specific embodiment, the mounting plate 110 serves as the basic support component of the entire placing rack, which is used to fix the placing rack to the headspace sampler 300 or other suitable positions. The connecting plate is connected to one side of the mounting plate 110 to provide the main support structure of the sampling needle 200. The fixed plate 120 is provided with a fixed convex column 130, which is designed with a placing groove 131. The shape and size of the placing groove 131 match those of the needle head 220 of the sampling needle 200, allowing the needle head 220 to be inserted therein to achieve preliminary positioning and fixation. The positioning plate 140 is provided with two, both of which are connected to the fixed plate 120 and are located above the convex column of the fixed plate 120. Both of the positioning plates 140 are arc-shaped plates, and the arcs are arranged in opposite directions to form an envelope of the flow guide pipe 210. The inner side walls of both of the positioning plates 140 can tightly abut against the outer wall of the flow guide pipe 210 to further position and fix the sampling needle 200 through physical contact, preventing it from shaking or falling off during storage. Not only does it achieve stable storage of the sampling needle 200, but it also reduces the occupied space through reasonable space layout, improving the neatness and work efficiency of the laboratory. At the same time, through the double fixation of the fixed convex column 130 and the positioning plate 140, the stability of the sampling needle 200 during storage is ensured, avoiding falling or damage due to shaking or external force.

[0028] Reference Figure 1 Specifically, on both of the positioning plates 140, a limiting plate 141 is connected respectively. The two limiting plates 141 are located near the fixed convex column 130 to clamp the outer wall of the connecting part 230 between the flow guide pipe 210 and the needle head 220. In this way, the limiting plate 141 can provide an additional fixed point specifically for positioning and clamping the connecting part 230 connecting the flow guide pipe 210 and the needle head 220, further limiting the movement of the sampling needle 200 during storage to prevent it from accidentally detaching from the placing rack.

[0029] Further, the end of the limiting plate 141 is designed with a limiting notch 142, which is arc-shaped and matches the shape of the outer wall of the connecting part 230. Not only does this increase the contact area between the limiting plate 141 and the sampling needle 200 and improve the stability of the fixing, but it also ensures that the limiting plate 141 can closely fit on the sampling needle 200, avoiding unnecessary damage to the sampling needle 200.

[0030] Further, the fixing plate 120 is provided with a fixing rod 150. One side of the positioning plate 140 is sleeved on the fixing rod 150, thereby realizing the stable connection between the positioning plate 140 and the fixing plate 120. Not only does this simplify the structure of the placing rack, but it also improves the overall stability and durability.

[0031] In order to further fix the positioning plate 140, limiting bosses 151 are arranged at the upper and lower ends of the fixing rod 150. The upper and lower side walls of the positioning plate 140 abut against the two limiting bosses 151 respectively, thereby limiting the movement range of the positioning plate 140 on the fixing rod 150 and ensuring that the positioning plate 140 can always remain in the correct position, providing stable support for the sampling needle 200.

[0032] Further, a limiting spring 152 is sleeved on the fixing rod 150. One end of the limiting spring 152 is connected to the limiting boss 151, and the other end abuts against the positioning plate 140. Through the elastic force of the limiting spring 152, the positioning plate 140 can be more closely fitted on the flow guide pipe 210, further improving the stability of the fixing of the sampling needle 200. At the same time, the limiting spring 152 can also absorb a certain impact force, protecting the sampling needle 200 from accidental damage.

[0033] Reference Figure 2 Specifically, the placing groove 131 is a tapered groove with a gradually decreasing inner diameter from top to bottom, so that the needle 220 can more easily find the correct position when inserted into the placing groove 131, and as the needle 220 penetrates deeper, the contraction of the tapered groove can gradually fix the needle 220, not only improving the ease of use of the placing rack, but also enhancing the stability of the fixing.

[0034] In some embodiments, the placing groove 131 is filled with a soft elastic material, which can provide better buffering and fixing effect, preventing the needle 220 from being damaged or shaken during storage. At the same time, the soft elastic material can also reduce the friction between the needle 220 and the placing groove 131, prolonging the service life of the sampling needle 200.

[0035] It should be noted that the fixed plate 120 and the mounting plate 110 are designed to be arranged perpendicular to each other, to be clamped on one side of the top of the headspace sampler 300, so that the rack can be firmly fixed on the headspace sampler 300, and does not occupy too much space. At the same time, this mounting method also facilitates the operator to quickly take and place the sampling needle 200, and improves the work efficiency.

[0036] With reference to Figure 3 The utility model also proposes a kind of headspace sampler 300, the headspace sampler 300 includes the sampling needle rack 100 as any one of the above described. By integrating this sampling needle rack 100, the headspace sampler 300 can provide more stable, safe sampling operation environment, and improve experimental efficiency and accuracy.

[0037] The embodiments of the utility model are explained in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by ordinary skilled in the art without departing from the purpose of the utility model.

Claims

1. A sample needle holder for use with a headspace sampler, the sample needle comprising a flow guide tube and a needle tip attached to an end of the flow guide tube, wherein, The utility model relates to a sampling needle placing rack, including: An installation plate; A fixed plate connected to one side of the installation plate, the fixed plate is provided with a fixed convex column, the fixed convex column is provided with a placing groove accommodating the needle insertion; Two positioning plates are arranged, both the positioning plates are connected to the fixed plate and are located above the fixed plate convex column, both the positioning plates are arc-shaped plates, and the arc-shaped plates are arranged in the opposite direction, the inner side walls of both the positioning plates can abut against the outer wall of the flow guide pipe to position the sampling needle.

2. The sampling needle placement stand of claim 1, wherein, Both the positioning plates are connected to a limiting plate, the limiting plate is located on the side close to the fixed convex column, the limiting plate clamps the outer wall of the connecting part of the flow guide pipe and the needle, so as to limit the sampling needle from being separated.

3. The sampling needle placement stand of claim 2, wherein, The end of the limiting plate is provided with a limiting notch, the limiting notch is arc-shaped to match the shape of the outer wall of the connecting part.

4. The sampling needle placement stand of claim 1, wherein, The fixed plate is provided with a fixed rod, one side of the positioning plate is sleeved on the fixed rod.

5. The sampling needle placement stand of claim 4, wherein, Both the upper and lower ends of the fixed rod are provided with limiting bosses, and the upper and lower side walls of the positioning plate abut against the two limiting bosses respectively.

6. The sampling needle placement stand of claim 5, wherein, The fixed rod is sleeved with a limiting spring, one end of the limiting spring is connected to the limiting boss, and the other end abuts against the positioning plate.

7. The sampling needle placement stand of claim 1, wherein, The placing groove is a tapered groove with a gradually decreasing inner diameter from top to bottom.

8. The sampling needle placement stand of claim 1, wherein, The placing groove is filled with elastic soft material.

9. The sampling needle placement stand of claim 1, wherein, The fixed plate and the installation plate are arranged perpendicularly to each other to be clamped on one side of the top of the headspace sampler.

10. A headspace sampler characterized in that, The utility model relates to a sampling needle placing rack, including as claimed in any one of claims 1 to 9.

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