Needle washing mechanism of automatic sample injector

Abstract

The utility model discloses a needle washing mechanism of an automatic sample injector, which comprises a needle washing cavity for accommodating a sample injection needle, the needle washing cavity is respectively communicated with a first interface and a second interface, and the inner wall surface of the needle washing cavity is designed as follows: the sample injection needle extends into the needle washing cavity and can be hermetically abutted against the inner wall surface of the needle washing cavity; the first interface is communicated with the inner cavity of the sample injection needle, and the second interface is communicated with the interlayer cavity outside the sample injection needle, so that the inner wall surface and the outer wall surface of the sample injection needle are convenient to clean. The sample injection needle cleaning device is reasonable in structure, thorough in sample injection needle cleaning and low in cleaning cost.

Description

Technical Field

[0001] The utility model relates to the technical field of sample detection, in particular to a needle washing mechanism of an automatic sample injector. Background Art

[0002] A sampler is a device or apparatus used to introduce samples into analytical instruments. It is widely used in laboratories, particularly in chemical analysis, biomedical research, and environmental monitoring. The sampler, a slender, needle-like tool used to introduce samples into analytical instruments, requires cleaning to avoid cross-contamination and ensure the accuracy and reproducibility of analytical results. Existing automated cleaning procedures often involve inserting the sampler into a static cleaning solution, which can leave sample liquid residue on the needle after repeated cleanings. Flushing cleaning methods often require high cleaning fluid consumption and are costly. Utility Model Content

[0003] The utility model discloses a needle washing mechanism for an automatic sampler, which solves the technical problems of incomplete or high cleaning costs of the sample needle in the prior art, and has the technical effects of reasonable structure, thorough cleaning of the sample needle and low cleaning costs. The technical solution adopted is as follows:

[0004] A needle washing mechanism for an automatic sampler includes a needle washing chamber for accommodating a sample injection needle, wherein the needle washing chamber is connected to a first interface and a second interface respectively. The inner wall surface of the needle washing chamber is designed so that the sample injection needle can be inserted into the needle washing chamber and can be sealed and abutted against the inner wall surface of the needle washing chamber, so that the first interface is connected to the inner cavity of the sample injection needle, and the second interface is connected to the interlayer cavity outside the sample injection needle, thereby facilitating the cleaning of the inner and outer wall surfaces of the sample injection needle.

[0005] On the basis of the above technical solution, the outer wall surface of the injection needle and the inner wall surface of the needle washing chamber are in contact with each other through a conical sealing.

[0006] On the basis of the above technical solution, the inner wall surface of the needle washing chamber that is in sealing contact with the injection needle is made of plastic material, and the injection needle is made of metal material.

[0007] On the basis of the above technical solution, the first interface is arranged on the bottom surface of the needle washing cavity, and the second interface is laterally connected to the needle washing cavity.

[0008] On the basis of the above technical solution, it also includes a needle washing tube and a needle washing seat that are detachably connected up and down, the needle washing tube and the needle washing seat together form a needle washing cavity, and the first inlet and the second interface are arranged on the needle washing seat.

[0009] On the basis of the above technical solution, the needle washing tube is further formed with a drainage cavity parallel to the needle washing cavity, and the drainage cavity is connected with the upper part of the needle washing cavity so that the waste liquid in the interlayer cavity can be discharged through the drainage cavity.

[0010] Based on the above technical solution, the drainage chamber is connected to the upper part of the needle washing chamber through a drainage trough. The inner bottom surface of the drainage trough is an inclined surface, so that the waste liquid enters the drainage chamber from the needle washing chamber under the action of its own weight. The drainage trough and the drainage chamber have a smooth transition, and the drainage trough gradually narrows along the flow direction of the waste liquid.

[0011] Based on the above technical solution, an annular liquid receiving groove surrounding the needle washing cavity is formed on the needle washing seat, the outlet end of the drainage cavity is arranged above the annular liquid receiving groove, and the outlet end of the drainage cavity extends downward to form a conical boss.

[0012] On the basis of the above technical solution, it also includes a pressure sensor arranged below the needle washing seat, and the pressure sensor is used to monitor the pressing force when the sampling needle abuts against the needle washing chamber seal.

[0013] On the basis of the above technical solution, it also includes a fixed needle seat bracket, which is arranged above the needle washing tube and formed with an injection needle avoidance hole. The needle seat bracket is used to support the components attached to the injection needle.

[0014] Beneficial effects

[0015] The utility model has a reasonable structure. When the sampling needle is inserted into the needle washing chamber, the needle washing chamber can be divided into two independent chambers. The two chambers are respectively connected to the first interface and the second interface, so that the inner and outer wall surfaces of the sampling needle can be cleaned independently. The interlayer cavity formed by the sampling needle and the inner wall surface of the needle washing chamber can be conveniently injected with cleaning liquid into the interlayer cavity to clean the outer wall surface of the sampling needle, which not only ensures the cleaning effect, but also greatly reduces the amount of cleaning liquid and reduces the cleaning cost. In addition, the inner and outer wall surfaces of the sampling needle in the present application are cleaned independently, and the inner and outer wall surfaces of the sampling needle can be cleaned at the same time, which can greatly improve the cleaning efficiency, thereby helping to improve the sample detection efficiency.

[0016] In the present application, the needle washing tube and the needle washing seat are detachably connected and enclosed to form a needle washing chamber, which facilitates the thorough cleaning of the needle washing chamber, further reduces cross contamination, and improves the accuracy and repeatability of the test results. In addition, the first interface and the second interface are formed on the needle washing seat, which provides conditions for the washing liquid in the interlayer cavity to flow in opposite directions to the washing liquid in the injection needle. When the washing liquid in the interlayer cavity and the washing liquid in the injection needle flow in opposite directions, the vibration caused by the flow of the washing liquid on the injection needle can be effectively offset, which is beneficial to improving the stability of the injection needle.

[0017] In the present application, the drainage chamber and the needle washing chamber are arranged in parallel, and the waste liquid formed by the cleaning liquid flowing through the interlayer chamber can enter the drainage chamber through the drainage trough. In view of the consideration of saving cleaning liquid, the interlayer chamber space is small, and the flow rate of waste liquid formed after cleaning is small. The setting of the drainage trough enables the waste liquid to be discharged quickly, avoiding the situation where the drainage is not complete due to the surface tension of the waste liquid droplets. In addition, the setting of the drainage trough in the present application is also conducive to the complete discharge of waste liquid and the reduction of waste liquid residue. In addition, the setting of the outlet end of the drainage chamber can prevent the waste liquid from adhering to the end face of the outlet end, further reducing the waste liquid residue. The present application also includes a pressure sensor arranged under the needle washing seat, which is used to monitor the pressing force when the injection needle and the needle washing chamber seal are in contact, which is convenient for automatic control. In addition, the setting of the needle seat bracket can prevent the components outside the injection needle from exerting force in the cleaning chamber, which is beneficial to improving the service life and sealing reliability of the cleaning mechanism.

[0018] The present application is flexible to use. When the injection needle is in sealed contact with the needle washing chamber, the injection needle and the flow path connected to the injection needle can be used as a quantitative loop, effectively simplifying the configuration of the injection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only one embodiment of the present invention. For those skilled in the art, other implementation drawings can be derived from the provided drawings without inventive effort.

[0020] Figure 1 : The three-dimensional structure of the utility model is shown Figure 1 ;

[0021] Figure 2 : The three-dimensional structure of the utility model is shown Figure 2 ;

[0022] Figure 3 : A schematic diagram of the cross-sectional structure of the side view of the utility model;

[0023] Figure 4 : Schematic diagram of the cross-sectional structure of the sample injection needle extending into the needle washing chamber in the utility model;

[0024] Figure 5 : Figure 4 Schematic diagram of the local enlarged structure at A in the middle; DETAILED DESCRIPTION

[0025] The following description and accompanying drawings sufficiently illustrate the specific embodiments herein to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in or substituted for portions and features of other embodiments. The scope of the embodiments herein includes the entire scope of the claims, including all available equivalents thereof. Herein, the terms "first," "second," and the like are used solely to distinguish one element from another and do not require or imply any actual relationship or order between these elements. In practice, the first element can also be referred to as the second element, and vice versa. Furthermore, the terms "comprise," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a structure, device, or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such structure, device, or apparatus. Without further limitation, an element defined by the phrase "comprising a..." does not preclude the presence of other identical elements in the structure, device, or apparatus comprising the element. The various embodiments herein are described in a progressive manner, with each embodiment focusing on its differences from the other embodiments. Similar or identical parts between the various embodiments can be referenced to each other.

[0026] The terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used herein to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are intended only to facilitate the description of this document and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. In the description herein, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, they can be mechanical or electrical connections, or they can be internal connections between two elements, they can be directly connected, or they can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0027] As used herein, unless otherwise specified, the term "plurality" means two or more.

[0028] In this document, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0029] In this article, the term "and / or" is used to describe the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0030] like Figures 1 to 5The needle washing mechanism of an automatic sampler shown in the figure comprises a needle washing tube 51 and a needle washing seat 52 which are detachably connected to each other. Specifically, the lower part of the needle washing tube 51 is provided with an external thread, and the needle washing seat 52 is provided with an internal thread which matches the external thread, and the bottom end surface of the needle washing tube 51 abuts against the shaft shoulder on the needle washing seat 52 to achieve a sealed connection, as shown in FIG. Figure 3 As shown, the needle washing tube 51 and the needle washing seat 52 together enclose a vertically extending needle washing cavity 100 .

[0031] like Figure 3 and 4 As shown, the needle washing chamber 100 is respectively connected with a first interface 521 and a second interface 522, and the first interface 521 and the second interface 522 are respectively arranged on the needle washing seat 52, wherein the first interface 521 is arranged on the inner bottom surface of the needle washing chamber 100 and is coaxial with the needle washing chamber 100, and the second interface 522 is arranged above the first interface 521 and is laterally connected to the needle washing chamber 100. During the cleaning process, a stream of cleaning liquid can flow through the injection needle 2 and the first interface 521 under the action of the peristaltic pump to be discharged, and the inner wall surface and pipeline of the injection needle 2 are cleaned. Another stream of cleaning liquid flows through the second interface 522 and the interlayer cavity and is discharged to clean the outer wall surface of the injection needle 2. This provides conditions for the cleaning liquid in the interlayer cavity to flow in the opposite direction to the cleaning liquid in the injection needle 2, and when the cleaning liquid in the interlayer cavity flows in the opposite direction to the cleaning liquid in the injection needle 2, the vibration caused by the flow of cleaning liquid to the injection needle 2 can be effectively offset, which is conducive to improving the stability of the injection needle 2.

[0032] like Figure 4 and 5 As shown, the injection needle 2 can vertically enter the needle washing chamber 100. The inner wall surface of the needle washing chamber 100 is designed so that the injection needle 2 can be extended into the needle washing chamber 100 and can be sealed against the inner wall surface of the needle washing chamber 100, so that the first interface 521 is connected with the inner cavity of the injection needle 2, and the second interface 522 is connected with the interlayer cavity outside the injection needle 2, so that the inner and outer wall surfaces of the injection needle 2 can be easily cleaned. Specifically, the lower part of the needle washing chamber 100 includes a conical surface. In order to facilitate puncturing the stopper of the sample bottle, the lower part of the injection needle is provided with a conical surface, so that the outer wall surface of the injection needle 2 and the inner wall surface of the needle washing chamber 100 are sealed against each other through the conical surface, as shown in FIG. Figure 5 shown.

[0033] Among them, the inner wall surface of the needle washing chamber 100 that is sealed against the outer wall surface of the injection needle 2 is made of plastic material, such as PEEK material, and the injection needle 2 is made of metal material, such as stainless steel. PEEK material has good corrosion resistance, sufficient structural strength and certain flexibility, and can achieve good sealing with the injection needle 2.

[0034] like Figure 3 and 4As shown, a drainage chamber 200 parallel to the needle washing chamber 100 is also formed on one side of the needle washing tube 51. The drainage chamber 200 is connected to the upper part of the needle washing chamber 100 through a drainage trough 300, so that the waste liquid in the interlayer chamber can be discharged through the drainage chamber. Specifically, the inner bottom surface of the drainage trough 300 is an inclined surface, so that the waste liquid can smoothly slide from the needle washing chamber 100 into the drainage chamber 200 under the action of its own weight. In addition, the groove wall of the drainage trough 300 and the inner wall surface of the drainage chamber 200 have a smooth transition, and the drainage trough 300 gradually narrows along the flow direction of the waste liquid; in view of the consideration of saving cleaning liquid, the interlayer chamber space in this application is small, and the flow rate of waste liquid formed after cleaning is small. The setting of the drainage trough 300 in this embodiment not only enables the waste liquid to be discharged quickly, but also avoids the situation where the drainage is not complete due to the surface tension of the waste liquid droplets, thereby reducing the residual waste liquid.

[0035] like Figure 3 and 4 As shown, the needle washing seat 52 is formed with an annular liquid receiving groove 523 surrounding the needle washing chamber, the outlet end of the drainage chamber 200 is located above the annular liquid receiving groove 523, and the outlet end of the drainage chamber 200 extends downward to form a tapered boss 400, so that waste liquid can be prevented from adhering to the end face of the outlet end, further reducing waste liquid residue. The lower part of the liquid receiving groove 523 is also connected to a drainage pipeline 55 for discharging the collected waste liquid outwards. In addition, the arrangement of the liquid receiving groove 523 and the drainage chamber 200 can replace the closed pipeline connection, which is convenient for the needle washing tube 51 and the needle washing seat 52 to be threadedly connected.

[0036] like Figure 1 and 2 As shown, a needle seat bracket 54 is also fixedly arranged. The needle seat bracket 54 is arranged above the needle washing tube 51 and is formed with an injection needle avoidance hole. The needle seat bracket 54 is used to support the components attached to the injection needle 2. This can prevent the injection needle 2 from applying the force of the attached components to the conical surface of the needle washing chamber 100 when it is in sealing contact with the needle washing chamber 100, which is beneficial to improving the service life of the needle washing chamber 100. A pressure sensor 53 is arranged below the needle washing seat 52. The pressure sensor 53 is used to monitor the pressing force applied by the injection needle 2 to the conical surface of the needle washing chamber 100. When the monitored pressing force reaches the set range value, it indicates that the injection needle 2 and the needle washing chamber 100 are sealed securely.

[0037] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments. Any changes or modifications based on the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A needle washing mechanism for an automatic sampler, characterized in that: The invention comprises a needle washing chamber (100) for accommodating an injection needle (2), wherein the needle washing chamber (100) is connected to a first interface (521) and a second interface (522), respectively. The inner wall surface of the needle washing chamber (100) is designed so that the injection needle (2) can be inserted into the needle washing chamber (100) and can be sealed against the inner wall surface of the needle washing chamber (100), so that the first interface (521) is connected to the inner cavity of the injection needle (2), and the second interface (522) is connected to the interlayer cavity outside the injection needle (2), so as to facilitate cleaning of the inner and outer wall surfaces of the injection needle (2).

2. The needle washing mechanism of the automatic sample injector according to claim 1, characterized in that: The outer wall surface of the injection needle (2) and the inner wall surface of the needle washing chamber (100) are in contact with each other through a conical sealing.

3. The needle washing mechanism of the automatic sample injector according to claim 2, characterized in that: The inner wall surface of the needle washing chamber (100) that is in sealing contact with the injection needle (2) is made of plastic material, and the injection needle (2) is made of metal material.

4. The needle washing mechanism of the automatic sample injector according to claim 2, characterized in that: The first interface (521) is provided on the inner bottom surface of the needle washing chamber (100), and the second interface (522) is laterally connected to the needle washing chamber (100).

5. The needle washing mechanism of the automatic sample injector according to any one of claims 1 to 4, characterized in that: It also includes a needle washing tube (51) and a needle washing seat (52) that are detachably connected to each other, wherein the needle washing tube (51) and the needle washing seat (52) together form a needle washing cavity (100), and the first interface (521) and the second interface (522) are provided on the needle washing seat (52).

6. The needle washing mechanism of the automatic sample injector according to claim 5, characterized in that: The needle washing tube (51) is further formed with a drainage cavity (200) parallel to the needle washing cavity (100), and the drainage cavity (200) is communicated with the upper part of the needle washing cavity (100) so that waste liquid in the interlayer cavity can be discharged through the drainage cavity (200).

7. The needle washing mechanism of the automatic sample injector according to claim 6, characterized in that: The drainage chamber (200) is connected to the upper part of the needle washing chamber (100) through the drainage groove (300). The inner bottom surface of the drainage groove (300) is an inclined surface, so that the waste liquid enters the drainage chamber (200) from the needle washing chamber (100) under the action of its own weight. The drainage groove (300) and the drainage chamber (200) have a smooth transition, and the drainage groove (300) gradually narrows along the flow direction of the waste liquid.

8. The needle washing mechanism of the automatic sample injector according to claim 7, characterized in that: An annular liquid receiving groove (523) surrounding the needle washing cavity (100) is formed on the needle washing seat (52), the outlet end of the drainage cavity (200) is arranged above the annular liquid receiving groove (523), and the outlet end of the drainage cavity (200) extends downward to form a conical boss (400).

9. The needle washing mechanism of the automatic sample injector according to any one of claims 6 to 8, characterized in that: It also includes a pressure sensor (53) provided below the needle washing seat (52), and the pressure sensor (53) is used to monitor the pressing force when the injection needle (2) and the needle washing chamber (100) are in sealing contact.

10. The needle washing mechanism of the automatic sample injector according to claim 9, characterized in that: It also includes a fixed needle seat bracket (54), which is arranged above the needle washing tube (51) and is formed with a sampling needle (2) avoidance hole, and is used to support components attached to the sampling needle (2).

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