Liquid injector for detection

Abstract

The utility model provides a liquid injector for detection, which relates to the technical field of detection and acquisition devices and comprises an outer needle cylinder, a first needle head, a second needle head, an inner needle cylinder and a piston rod, a group of centrosymmetric connectors are arranged at the front end of the outer needle cylinder, the first needle head and the second needle head are respectively mounted with the connectors, and the inner needle cylinder is rotatably mounted in the outer needle cylinder. The outer wall of the inner needle cylinder is attached to the inner wall of the outer needle cylinder, a through hole communicated with the connector is formed in the front end of the inner needle cylinder, the rear end of the front end of the inner needle cylinder extends out of the rear end of the outer needle cylinder, and the piston rod is installed in the inner needle cylinder. Inconvenience in operation and sample pollution caused by replacement of an injection head are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to detection collection device technical field, concretely relates to a detection liquid injector. BACKGROUND

[0002] When chromatographic analysis is carried out on transformer oil, oil samples need to be collected from the transformer by a syringe, and then the oil samples are injected into a chromatograph for analysis. After collecting the oil samples, the traditional syringe needs to replace the injection head for sample injection operation. The process of replacing the injection head is not only cumbersome to operate, but also may cause sample contamination, thereby affecting the accuracy of the analysis result. Therefore, the present application provides an improved liquid injector for detection to simplify the operation process, avoid the wetting problem of the sample when replacing the injection head, and improve the analysis accuracy. SUMMARY

[0003] In order to overcome the problems in the background art, the utility model provides a kind of liquid injector for detection, to provide a double-needle syringe for transformer oil chromatographic analysis, design has two needle heads, one is used for the collection of oil sample, another is used for the sample injection of chromatograph, and the switchable connection of two needle heads is realized by improving needle tube structure, to avoid the inconvenience of operation and sample contamination caused by replacing injection head.

[0004] To achieve the above object, the utility model is realized by the following technical scheme:

[0005] A kind of liquid injector for detection, including outer needle cylinder, needle head one, needle head two, inner needle cylinder and piston rod, the outer needle cylinder front end is provided with a group of center-symmetrical connecting heads, needle head one and needle head two are installed with connecting head, inner needle cylinder is rotatably installed in outer needle cylinder, inner needle cylinder outer wall is attached with inner wall of outer needle cylinder, a through hole is opened in the front end of inner needle cylinder and is communicated with connecting head, inner needle cylinder front end extends the rear end of outer needle cylinder, and piston rod is installed in inner needle cylinder.

[0006] Further, the needle head one and needle head two are metal needle head and hose needle head respectively.

[0007] Further, the outer needle cylinder and inner needle cylinder are limitedly installed between the limit ring, so that the front end of inner needle cylinder and the front end of outer needle cylinder are kept in contact.

[0008] Further, the rear end of the outer needle cylinder and the inner needle cylinder is respectively provided with handle one and handle two, a group of limit grooves corresponding to the same side of connecting head is arranged on handle one of outer needle cylinder, and a limit block corresponding to the same side of through hole and matched with limit groove is arranged on handle two of inner needle cylinder.

[0009] The utility model has the advantages that:

[0010] The application realizes the division of sampling and sampling by designing a double-needle structure and a switching needle cylinder structure, does not need to replace the injection head, greatly simplifies the operation process, avoids sample pollution, ensures the storage safety of oil samples, and maintains the accuracy of analysis results. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings needed to be used in the description of the embodiments will be described.

[0012] Fig. 1 It is a schematic diagram of the overall structure of the present application.

[0013] Fig. 2 It is a schematic diagram of the cross-sectional structure of the present application.

[0014] Fig. 3 It is a schematic diagram of the internal structure of the present application.

[0015] 1-outer needle cylinder, 11-connection head, 12-grip handle one, 13-limiting groove, 2-needle one, 3-needle two, 4-inner needle cylinder, 41-through hole, 42-grip handle two, 43-limiting block, 44-limiting ring, 5-piston rod. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and beneficial effects of the present application more clear, the preferred embodiments of the present application will be described in detail below with reference to the drawings, so as to facilitate the understanding of the technical personnel.

[0017] The utility model discloses a kind of injection for detection, refer to Figs. 1-3 A kind of injection for detection, including outer needle cylinder 1, needle one 2, needle two 3, inner needle cylinder 4 and piston rod 5, the outer needle cylinder 1 front end is provided with a group of central symmetry connection head 11, needle one 2 and needle two 3 are respectively installed with connection head 11 can be respectively used for sampling and chromatograph sampling, inner needle cylinder 4 is rotatably installed in outer needle cylinder 1, inner needle cylinder 4 outer wall is attached with outer needle cylinder 1 inner wall, through hole 41 is opened in the front end of inner needle cylinder 4, and is communicated with connection head 11, by rotating inner needle cylinder 4, through hole 41 can be realized respectively individually with needle one 2 or needle two 3 communication to carry out sampling and sampling, inner needle cylinder 4 front end rear end projects outer needle cylinder 1 rear end to facilitate rotation, piston rod 5 is installed in inner needle cylinder 4 and is moved by piston to sample and sample.

[0018] Refer to Figs. 1-3 , the needle one 2 and needle two 3 are respectively metal needle and hose needle, so that sampling and sampling operation are not mutually blocked and influenced, convenient operation can be adapted to different peripheral conditions, and also convenient to distinguish and identify, to avoid mixed use.

[0019] Refer to Figs. 1-3The outer needle cylinder 1 and the inner needle cylinder 4 are limitedly installed through the limiting ring 44, so that the front end of the inner needle cylinder 4 is kept in contact with the front end of the outer needle cylinder 1, and displacement and out of the inner needle cylinder 4 is avoided to affect the sealing performance.

[0020] Referring to Figs. 1-3 The outer needle cylinder 1 and the inner needle cylinder 4 are limitedly installed through the limiting ring 44, so that the front end of the inner needle cylinder 4 is kept in contact with the front end of the outer needle cylinder 1, and displacement and out of the inner needle cylinder 4 is avoided to affect the sealing performance.

[0021] Working process:

[0022] Before collecting the oil sample, the inner needle cylinder 4 is rotated to connect the through hole 41 with the needle head one 2 or the needle head two 3, the connected needle head is inserted into the transformer oil, and the piston rod 5 in the inner needle cylinder 4 is used to suck the oil sample, after the collection is completed, the through hole 41 of the inner needle cylinder 4 is rotated to the middle position to seal, and the needle cap of the sampling needle head 2 and the sampling needle head 3 is closed to temporarily store the oil sample; when sampling, the inner needle cylinder 4 is rotated to connect the through hole 41 with the other unused needle head, the needle head is inserted into the chromatograph interface, the piston rod 5 is used to slowly push the oil sample, and the sampling operation is completed. After the experiment is completed, the needle head is used to suck the cleaning solvent to clean the needle cylinder and the needle head.

[0023] The above is only the preferred specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the application concept of the present application within the technical range disclosed by the present application, and all of them should be covered in the protection scope of the present application.

Claims

1. A test injection device, characterized by: Including outer needle cylinder (1), needle head one (2), needle head two (3), inner needle cylinder (4) and piston rod (5), the outer needle cylinder (1) front end is provided with a group of central symmetry connecting head (11), needle head one (2) and needle head two (3) are installed with connecting head (11) respectively, inner needle cylinder (4) is rotatably installed in outer needle cylinder (1), inner needle cylinder (4) outer wall is attached with outer needle cylinder (1) inner wall, inner needle cylinder (4) front end is provided with a through hole (41) that is communicated with connecting head (11), inner needle cylinder (4) front end rear end extends outer needle cylinder (1) rear end, piston rod (5) is installed in inner needle cylinder (4).

2. The syringe for use in the method of claim 1, wherein: The needle head one (2) and needle head two (3) are metal needle head and hose needle head respectively.

3. The syringe of claim 1, wherein: The outer needle cylinder (1) and inner needle cylinder (4) are limitedly installed between through limiting ring (44), so that the front end of inner needle cylinder (4) keeps in contact with the front end of outer needle cylinder (1).

4. The syringe of claim 1, wherein: The rear end of the outer needle cylinder (1) and the rear end of the inner needle cylinder (4) are respectively provided with a handle one (12) and a handle two (42), a group of limiting grooves (13) corresponding to the connecting head (11) are arranged on the handle one (12) of the outer needle cylinder (1), and a limiting block (43) corresponding to the through hole (41) and matched with the limiting grooves (13) is arranged on the handle two (42) of the inner needle cylinder (4).

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