Gas chromatography liquid sample injection needle anti-bending device and gas chromatography liquid sample injection needle
By incorporating a telescopic sleeve around the gas chromatograph injection needle to prevent bending, the problem of needle breakage has been solved, resulting in a longer service life, lower cost, improved adaptability, and prevention of cross-contamination.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-03-31
AI Technical Summary
Existing gas chromatography injection needles are prone to breakage during operation due to the angle and degree of force applied by the operator, which affects the detection progress and increases costs.
A gas chromatography liquid injection needle anti-bending device is adopted, including a connecting component and a telescopic sleeve. The telescopic sleeve is fitted around the outer periphery of the injection needle and can extend and retract along the long axis to provide axial support force, disperse external impact, and reset and wrap the needle after puncture to reduce the probability of breakage.
It extends the lifespan of the injection needle, reduces the probability of breakage, increases the adaptability and compatibility of the device, reduces the cost of use, and reduces the risk of sample residue and cross-contamination.
Smart Images
Figure CN224066737U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of organic chemical analysis technology, specifically relating to a device for preventing bending of a gas chromatography liquid injection needle and a gas chromatography liquid injection needle. Background Technology
[0002] During the grape ripening period, gas chromatography is used to analyze volatile substances (such as esters and aldehydes) in grape juice and skins to assess fruit ripeness and aromatic content, providing a scientific basis for harvesting timing and ensuring the wine produced has a pure and authentic flavor.
[0003] Currently, in gas chromatography analysis, sample injection requires manually injecting organic matter into the instrument using a syringe needle. However, because the syringe needle is thin, long, and soft, it has poor bending resistance and is easily bent and broken due to the operator's puncture force and angle. This affects the actual injection volume, causing inconvenience to the detection work. The cost of syringe needles is high, and repeated breakage will increase the detection cost. Furthermore, broken syringe needles need to be handled properly, as they can easily injure operators, increasing safety risks. Utility Model Content
[0004] This utility model provides a device to prevent the bending of a gas chromatography liquid injection needle and a gas chromatography liquid injection needle, aiming to solve the technical problem in the prior art that the injection needle is easily broken during use due to the influence of the operator's applied force angle and force, which affects the detection progress and detection cost.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] In a first aspect, a device for preventing the bending of a gas chromatography liquid injection needle is provided, which is fitted around the outer periphery of the injection needle. The device includes a connecting component and a telescopic sleeve. One end of the connecting component is connected to the telescopic sleeve, and the other end is connected to the injection needle. The telescopic sleeve is fitted around the outer periphery of the injection needle and spaced apart from the injection needle. The telescopic sleeve can extend and retract in a direction parallel to the long axis of the injection needle.
[0007] In conjunction with the first aspect, in one possible implementation, the telescopic sleeve includes a plurality of coaxially fitted telescopic joints, with adjacent telescopic joints slidingly engaged.
[0008] In conjunction with the first aspect, in one possible implementation, the telescopic sleeve is a shape memory alloy component that automatically recovers its shape after being compressed.
[0009] In conjunction with the first aspect, in one possible implementation, the outer diameter of the plurality of expansion joints decreases segment by segment in a direction away from the injection needle; the inner diameter of the plurality of expansion joints decreases segment by segment in a direction away from the injection needle.
[0010] In conjunction with the first aspect, in one possible implementation, the top outer periphery of the expansion joint is provided with a limiting protrusion, and the bottom inner wall of the expansion joint is provided with a limiting ring, wherein the limiting protrusion and the limiting ring in the adjacent expansion joint can be engaged.
[0011] In conjunction with the first aspect, in one possible implementation, the connecting assembly includes a connecting sleeve, one end of which has a fixing cylinder fitted onto the top of the telescopic sleeve, and the other end of the connecting sleeve has a connecting hole that overlaps with the axis of the fixing cylinder, and the connecting hole is inserted and fixed to the syringe of the injection needle.
[0012] In conjunction with the first aspect, in one possible implementation, the connecting component further includes a plurality of limiting plates, which are disposed around the outer periphery of the connecting hole and form a limiting space. The bottom end of the syringe of the injection needle extends into the limiting space to limit the displacement of the syringe in the direction perpendicular to its own long axis.
[0013] The gas chromatography liquid injection needle anti-bending device provided by this utility model, compared with the prior art, features a telescopic sleeve fitted around the injection needle that can freely extend and retract along its long axis during injection, reducing the risk of needle bending due to lateral forces. When the needle punctures the septum, the sleeve contracts to provide axial support and disperse external impact; after puncture, the sleeve returns to its original position to enclose the needle, preventing accidental collisions, reducing the probability of needle breakage, and extending service life. The fixed design of the connecting component and the injection needle ensures compatibility with different needle models, achieving the anti-bending function without replacing the original needle body, increasing the adaptability and compatibility of the device, and reducing operating costs.
[0014] Secondly, this application provides a gas chromatography liquid injection needle, comprising:
[0015] Syringe;
[0016] A needle is disposed at one end of the syringe, and the needle communicates with the inner cavity of the syringe; and
[0017] In any of the above possible implementations of the gas chromatography liquid injection needle anti-bending device, the connecting component in the gas chromatography liquid injection needle anti-bending device is connected to the syringe barrel, and the telescopic sleeve in the gas chromatography liquid injection needle anti-bending device is sleeved on the outer periphery of the needle tip.
[0018] In conjunction with the second aspect, in one possible implementation, the maximum telescopic length of the telescopic sleeve is equal to the length of the needle.
[0019] In conjunction with the second aspect, in one possible implementation, the syringe has a piston rod inside, and a displacement sensor is connected to the end of the piston rod.
[0020] The gas chromatography liquid injection needle provided by this invention, compared with the prior art, features a telescopic sleeve that can freely extend and retract along its long axis during injection, reducing the risk of needle bending due to lateral forces. When the needle punctures the septum, the sleeve contracts to provide axial support and disperse external impacts; after puncture, the sleeve returns to its original position to enclose the needle, preventing accidental collisions, reducing the probability of needle breakage, and extending service life. The fixed design of the connecting component and the injection needle ensures compatibility with different needle models, achieving anti-bending function without replacing the original needle body, increasing the adaptability and compatibility of the device, and reducing operating costs. During needle puncture, the telescopic sleeve absorbs excessive pressure applied by the operator through elastic deformation, reducing the probability of needle breakage due to human error; the sleeve enveloping the needle creates a sealed space, reducing sample residue or environmental contaminant adhesion and preventing cross-contamination. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the structure of a gas chromatography liquid injection needle anti-bending device provided in an embodiment of the present invention;
[0023] Figure 2 for Figure 1 Cross-sectional view of the connecting components used in the process;
[0024] Figure 3 for Figure 1 A partial cross-sectional view of the telescopic sleeve used in the process;
[0025] Figure 4 This is a schematic diagram of the structure of a gas chromatography liquid injection needle used in another embodiment of the present invention.
[0026] Explanation of reference numerals in the attached figures:
[0027] 1. Telescopic sleeve; 11. Telescopic joint; 111. Limiting protrusion; 112. Limiting ring;
[0028] 2. Connecting assembly; 21. Connecting sleeve; 211. Fixing cylinder; 212. Connecting hole; 22. Limiting piece;
[0029] 3. Syringe; 31. Piston rod; 32. Displacement sensor;
[0030] 4. Needle. Detailed Implementation
[0031] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is actually illustrative only and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0035] It should be noted that the terms "length," "width," "height," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. The directional terms "inner" and "outer" refer to the inside or outside relative to the outline of each component itself.
[0036] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0037] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.
[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Additionally, "multiple" and "several" mean two or more, unless otherwise explicitly specified.
[0039] Please refer to the following: Figures 1 to 4The present invention provides a description of the anti-bending device for gas chromatography liquid injection needles. The anti-bending device for gas chromatography liquid injection needles is fitted around the outer circumference of the injection needle and includes a connecting component 2 and a telescopic sleeve 1. One end of the connecting component 2 is connected to the telescopic sleeve 1, and the other end is connected to the injection needle. The telescopic sleeve 1 is fitted around the outer circumference of the injection needle and spaced apart from it. The telescopic sleeve 1 can extend and retract in a direction parallel to the long axis of the injection needle.
[0040] It should be noted that the anti-bending device for gas chromatography liquid injection needles provided in this embodiment can be applied not only to the winemaking process, but also to the processes of other beverages such as fruit juice brewing, wheat juice brewing, and food testing.
[0041] It should be noted that the principle used in this embodiment is as follows: the telescopic sleeve 1 is fixed on the liquid injection needle. When the injection needle is working, the needle tip 4 is fixed by the telescopic sleeve 1 and will not bend left or right. It can only be inserted into the instrument's injection port from top to bottom. As it gradually penetrates deeper into the instrument's injection port, the telescopic sleeve 1 is continuously squeezed and gradually contracts with the pressure as it enters the injection port until the needle tip 4 is inserted into the position set by the instrument, thus completing the injection.
[0042] The gas chromatography liquid injection needle anti-bending device provided in this embodiment, compared with the prior art, features a telescopic sleeve 1 fitted around the injection needle that can freely extend and retract along its long axis during injection, reducing the risk of needle tip 4 bending due to lateral forces. When the needle tip 4 punctures the septum, the sleeve contracts to provide axial support and disperse external impacts; after puncture, the sleeve returns to its original position to enclose the needle tip 4, preventing accidental collisions, reducing the probability of needle breakage, and extending service life. The fixing design of the connecting component 2 and the injection needle ensures compatibility with different models of injection needles, achieving the anti-bending function without replacing the original needle body, increasing the adaptability and compatibility of the device, and reducing usage costs.
[0043] In some embodiments, see Figure 1 and Figure 3 The telescopic sleeve 1 includes multiple coaxially mounted telescopic joints 11, with adjacent telescopic joints 11 slidingly engaged. This multi-joint structure extends the protection range. During retraction, multiple telescopic joints 11 can retract into the topmost telescopic joint 11, ensuring uniform force distribution on the needle 4 throughout its movement and reducing the risk of localized stress concentration. The sliding engagement of adjacent telescopic joints 11 enables precise extension and retraction, preventing frictional wear between the telescopic sleeve 1 and the needle 4.
[0044] In some embodiments, the telescopic sleeve 1 is a shape memory alloy component that automatically recovers its original shape after compression. The shape memory alloy material can restore its original shape at high temperatures (such as in a gas chromatography vaporization chamber environment), thus solving the problem of accumulated plastic deformation.
[0045] Optionally, the telescopic sleeve 1 is made of titanium-nickel alloy.
[0046] As another embodiment of the telescopic sleeve 1, the telescopic sleeve 1 is made of stainless steel, which improves corrosion resistance and strength and extends service life.
[0047] In some embodiments, see Figure 1 and Figure 4 The outer diameter of the multiple expansion joints 11 decreases progressively in the direction away from the injection needle; the inner diameter of the multiple expansion joints 11 also decreases progressively in the direction away from the injection needle. The progressively decreasing outer diameter design reduces the overall volume of the device, adapts to narrow injection ports, and forms a stepped sealing structure when the sleeve contracts, reducing the risk of sample leakage and improving sealing performance and ease of use.
[0048] In practice, the inner diameter of the previous expansion joint 11 is equal to the outer diameter of the adjacent next expansion joint 11.
[0049] In some embodiments, see Figure 3 The top outer periphery of the expansion joint 11 is provided with a limiting protrusion 111, and the bottom inner wall of the expansion joint 11 is provided with a limiting ring 112. The limiting protrusion 111 and the limiting ring 112 in the adjacent expansion joint 11 can engage. The engagement of the limiting protrusion 111 and the limiting ring 112 prevents the expansion joint 11 from disengaging, ensures the stability of the expansion and contraction process of the expansion sleeve 1, and guarantees normal operation. Each expansion joint 11 is an individual part, which allows for the individual replacement of damaged expansion joints 11, reducing maintenance costs.
[0050] In some embodiments, see Figure 2 The connecting component 2 includes a connecting sleeve 21. One end of the connecting sleeve 21 has a fixing cylinder 211, which is fitted onto the top of the telescopic sleeve 11. The other end of the connecting sleeve 21 has a connecting hole 212, which overlaps with the axis of the fixing cylinder 211. The connecting hole 212 is inserted and fixed to the syringe barrel 3 of the injection needle. The insertion and fixing method of the connecting sleeve 21 simplifies the assembly process of this device and the syringe barrel 3, as it can be achieved by simply inserting and removing the sleeve, thus speeding up the installation process. The coaxial design of the fixing cylinder 211 and the connecting hole 212 ensures that the puncture force is transmitted along the axis, which reduces the lateral force component and improves the puncture effect.
[0051] In some embodiments, see Figure 2 and Figure 1 The connecting assembly 2 also includes multiple limiting plates 22, which are arranged around the outer periphery of the connecting hole 212. The multiple limiting plates 22 enclose a limiting space, into which the bottom end of the syringe barrel 3 of the injection needle extends to restrict displacement of the syringe barrel in the direction perpendicular to its long axis. The limiting space formed by the limiting plates 22 enhances the fixing strength between the syringe barrel 3 and the connecting assembly 2, preventing displacement of the syringe barrel 3 during injection. In practice, the tightness of the limiting plates 22 can be adjusted to accommodate syringe barrels 3 of different diameters, increasing the applicability of the device.
[0052] In practice, the limiting piece 22 fits against the outer periphery of the syringe to fix the syringe in place.
[0053] Based on the same inventive concept, this application also provides a gas chromatography liquid injection needle, see reference. Figure 4 The gas chromatography liquid injection needle includes a syringe barrel 3, a needle tip 4, and a gas chromatography liquid injection needle anti-bending device as described in any of the above embodiments. The needle tip 4 is located at one end of the syringe barrel 3 and communicates with the inner cavity of the syringe barrel 3; the connecting component 2 in the gas chromatography liquid injection needle anti-bending device is connected to the syringe barrel 3, and the telescopic sleeve 1 in the gas chromatography liquid injection needle anti-bending device is sleeved on the outer periphery of the needle tip 4.
[0054] Compared with the prior art, the gas chromatography liquid injection needle provided in this embodiment features a telescopic sleeve 1 that can freely extend and retract along its long axis during injection, reducing the risk of bending of the needle tip 4 due to lateral forces. When the needle tip 4 punctures the septum, the sleeve contracts to provide axial support and disperse external impacts. After puncture, the sleeve returns to its original position to enclose the needle tip 4, preventing accidental collisions, reducing the probability of needle breakage, and extending service life. The fixing design of the connecting component 2 and the injection needle ensures compatibility with different models of injection needles, achieving anti-bending function without replacing the original needle body, increasing the adaptability and compatibility of the device, and reducing usage costs. During needle tip puncture, the telescopic sleeve 1 absorbs excessive pressure applied by the operator through elastic deformation, reducing the probability of needle tip 4 breakage due to human error. When the sleeve encloses the needle tip 4, it forms a sealed space, reducing sample residue or environmental contaminant adhesion and preventing cross-contamination.
[0055] In some embodiments, see Figure 4 The maximum extension length of the telescopic sleeve 1 is equal to the length of the needle 4. Matching the maximum extension length of the telescopic sleeve 1 with the length of the needle 4 ensures that the needle tip is protected throughout its entire length, providing full coverage protection for the needle 4. It also avoids redundant friction caused by an excessively long telescopic sleeve 1 or insufficient protection caused by an excessively short telescopic sleeve 1.
[0056] In some embodiments, see Figure 4 The syringe 3 contains a piston rod 31, and a displacement sensor 32 is connected to the end of the piston rod 31. The displacement sensor 32 can provide real-time feedback on the position of the piston rod 31, thereby assisting in determining the injection depth and sample volume. In practice, the piston rod 31 slides along the long axis of the syringe 3.
[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A gas chromatography liquid sample injection needle anti-buckling device, sleeved on the outer periphery of the sample injection needle, characterized in that, The device comprises a connecting assembly and a telescopic sleeve, one end of the connecting assembly is connected with the telescopic sleeve, the other end is connected with a sample injection needle, the telescopic sleeve is sleeved on the outer periphery of the sample injection needle and is arranged in a spaced manner with the sample injection needle, and the telescopic sleeve can be telescoped in a direction parallel to the long axis of the sample injection needle.
2. The gas chromatograph liquid injection needle anti-buckling device of claim 1, wherein, The telescopic sleeve comprises a plurality of telescopic sections arranged coaxially.
3. The gas chromatograph liquid injection needle anti-kinking device of claim 1, wherein, The telescopic sleeve is a memory alloy component to automatically recover after compression.
4. The gas chromatograph liquid injection needle anti-kinking device of claim 2, wherein, The outer diameters of the plurality of telescopic sections gradually decrease in a direction away from the sample injection needle; the inner diameters of the plurality of telescopic sections gradually decrease in a direction away from the sample injection needle.
5. The gas chromatograph liquid injection needle anti-kinking device of claim 2, wherein, The top end of the telescopic section is provided with a limiting protrusion, and the inner wall of the bottom end of the telescopic section is provided with a limiting ring, and the limiting protrusion and the limiting ring in the adjacent telescopic section can be clamped and matched.
6. The gas chromatograph liquid injection needle anti-kink device of claim 1 wherein, The connecting assembly comprises a connecting sleeve, one end of the connecting sleeve is provided with a fixing cylinder, the fixing cylinder is sleeved on the top end of the telescopic sleeve, the other end of the connecting sleeve is provided with a connecting hole, the connecting hole overlaps the axis of the fixing cylinder, and the connecting hole is inserted and fixed with the needle cylinder of the sample injection needle.
7. The gas chromatograph liquid injection needle anti-kink device of claim 6 wherein, The connecting assembly further comprises a plurality of limiting pieces, the plurality of limiting pieces are arranged around the outer periphery of the connecting hole, the plurality of limiting pieces form a limiting space, the bottom end of the needle cylinder of the sample injection needle is inserted into the limiting space to limit the displacement of the needle cylinder in the direction perpendicular to the long axis of the needle cylinder.
8. A gas chromatography liquid sample injection needle characterized by, The device comprises: a needle cylinder; a needle head arranged at one end of the needle cylinder, the needle head being in communication with the inner cavity of the needle cylinder; and a connecting assembly and a telescopic sleeve, one end of the connecting assembly is connected with the telescopic sleeve, the other end is connected with a sample injection needle, the telescopic sleeve is sleeved on the outer periphery of the sample injection needle and is arranged in a spaced manner with the sample injection needle, and the telescopic sleeve can be telescoped in a direction parallel to the long axis of the sample injection needle. The maximum telescopic length of the telescopic sleeve is equal to the length of the needle head.
9. The gas chromatography liquid injection needle of claim 8, wherein, The needle cylinder is internally provided with a piston rod, and the end of the piston rod is connected with a displacement sensor.
10. The gas chromatography liquid sample introduction needle of claim 8, wherein,