Liquid sample injection valve

Abstract

The utility model discloses a kind of liquid sample introduction valve, comprising: cylinder chamber, the inside of cylinder chamber is equipped with piston and two air inlets;Gasification chamber, gasification chamber is located at one side of cylinder chamber, and one end of gasification chamber is equipped with outlet;Connecting cover, connecting cover is connected between cylinder chamber and gasification chamber;Sample introduction chamber, sample introduction chamber is located inside connecting cover, and the top and bottom of sample introduction chamber are respectively connected with sample introduction tube and sample outlet tube, and first conical gasket and second conical gasket are equipped between sample introduction chamber and cylinder chamber, gasification chamber;Sample introduction needle, one end of sample introduction needle is connected with piston, and the other end is sequentially penetrated cylinder chamber, first conical gasket, sample introduction chamber, second conical gasket, inserted into gasification chamber, and the surface of sample introduction needle is equipped with groove;Carrier gas inlet, carrier gas inlet is opened in one end of gasification chamber, and is communicated with the inside of gasification chamber;Heating module, heating module is connected with gasification chamber.The utility model can satisfy the sampling demand of trace (μL) level.

Description

Technical Field

[0001] This utility model relates to the field of injection valve technology, and in particular to a liquid injection valve. Background Technology

[0002] In fields such as gas chromatography, online process monitoring, and flow chemistry analysis, the automatic and precise introduction of trace liquid samples into the analytical system is a fundamental and crucial technology. Currently, gas or liquid injection valves are widely used to introduce quantitative samples into the instrument, but existing gas or liquid injection valves have limited accuracy in micro-sampling and cannot meet the requirements of injection volumes at the microliter (μL) level. Summary of the Invention

[0003] According to an embodiment of the present invention, a liquid injection valve is provided, comprising: The cylinder chamber contains a piston and two air intake ports. The vaporization chamber is located on one side of the cylinder chamber, and an outlet is provided at one end of the vaporization chamber; A connecting cover connects the cylinder chamber and the vaporization chamber; The sample inlet chamber is located inside the connecting cover. The top and bottom of the sample inlet chamber are connected to the sample inlet tube and the sample outlet tube, respectively. A first conical sealing gasket and a second conical sealing gasket are provided between the sample inlet chamber and the cylinder chamber and the vaporization chamber. The injection needle has one end connected to the piston and the other end passing through the cylinder chamber, the first conical sealing gasket, the injection chamber, and the second conical sealing gasket in sequence, and is inserted into the vaporization chamber. The surface of the injection needle is provided with grooves. The carrier gas inlet is located at one end of the vaporization chamber and is connected to the interior of the vaporization chamber. The heating module is connected to the vaporization chamber and is used to heat the vaporization chamber.

[0004] Furthermore, a third conical sealing gasket, multiple adjusting shims, sealing gaskets, and a fourth conical sealing gasket are sequentially provided between the first conical sealing gasket and the cylinder chamber.

[0005] Furthermore, it also includes: two quick-connect fittings, which are respectively located on the two air inlets.

[0006] Furthermore, it also includes: a flow guide sleeve, which is disposed inside the injection chamber and is fitted onto the other end of the injection needle, and the flow guide sleeve is connected to the carrier gas inlet.

[0007] Furthermore, the heating module includes a heating rod and a temperature sensor, which are installed inside the vaporization chamber for heating the vaporization chamber and detecting the heating temperature.

[0008] Furthermore, it also includes: a discharge connector, which is located at the outlet of the vaporization chamber.

[0009] Furthermore, it also includes: an inlet connector and an outlet connector, with the inlet connector located at the end of the inlet tube and the outlet connector located at the end of the outlet tube.

[0010] Furthermore, it also includes: a mounting bracket, which is connected to the vaporization chamber.

[0011] According to an embodiment of the present invention, a liquid injection valve has a groove with a small cross-section on the surface of the injection needle. The groove with the small cross-section can carry a microliter (μL) level liquid sample into the guide sleeve, and the microliter (μL) level liquid sample is carried out by the flowing carrier gas and sent to the chromatographic column, thus meeting the needs of micro-sampling.

[0012] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0013] Figure 1 This is a cross-sectional structural schematic diagram of a liquid injection valve according to an embodiment of the present utility model.

[0014] Figure 2 This is a three-dimensional structural diagram of a liquid injection valve according to an embodiment of the present invention.

[0015] Figure 3 This is a three-dimensional structural diagram of the injection needle in a liquid injection valve according to an embodiment of the present invention. Detailed Implementation

[0016] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0017] First, combine Figures 1-3 This invention describes a liquid injection valve according to an embodiment of the present invention, used for micro-sampling, and has a wide range of applications.

[0018] like Figures 1-3 As shown, a liquid injection valve according to an embodiment of the present invention includes a cylinder chamber 100, a vaporization chamber 200, a connecting cover 300, an injection chamber 400, an injection needle 500, a carrier gas inlet 600, and a heating module.

[0019] Specifically, such as Figures 1-2 As shown, the cylinder chamber 100 is equipped with a piston 101 and two air inlets 102. The piston 101 moves by injecting gas into the two air inlets 102 respectively.

[0020] Specifically, such as Figures 1-2 As shown, the vaporization chamber 200 is located on one side of the cylinder chamber 100, and one end of the vaporization chamber 200 is provided with an outlet.

[0021] Specifically, such as Figures 1-2 As shown, the connecting cover 300 is connected between the cylinder chamber 100 and the vaporization chamber 200 to achieve the connection and fixation between the cylinder chamber 100 and the vaporization chamber 200.

[0022] Specifically, such as Figures 1-2 As shown, the sample inlet chamber 400 is located inside the connecting cover 300. The top and bottom of the sample inlet chamber 400 are connected to an inlet tube 401 and an outlet tube 402, respectively. A first conical sealing gasket 403 and a second conical sealing gasket 404 are provided between the sample inlet chamber 400 and the cylinder chamber 100 and the vaporization chamber 200. The first conical sealing gasket 403 and the second conical sealing gasket 404 are used to ensure a sealed connection between the sample inlet chamber 400 and the cylinder chamber 100 and the vaporization chamber 200. The inlet tube 401 is used to deliver the sample solution into the sample inlet chamber 400, and the outlet tube 402 is used to discharge the sample solution from the sample inlet chamber 400.

[0023] Specifically, such as Figures 1-3 As shown, one end of the injection needle 500 is connected to the piston 101, and the other end passes sequentially through the cylinder chamber 100, the first conical sealing gasket 403, the injection chamber 400, and the second conical sealing gasket 404, before being inserted into the vaporization chamber 200. The surface of the injection needle 500 is provided with grooves 501, initially aligned with the injection tube 401. The injection needle 500 is a metal rod with small cross-sectional grooves 501 for the flow of liquid samples. The injection needle 500 moves with the piston 101, thereby transporting the sample solution inside the injection chamber 400 to the vaporization chamber.

[0024] Specifically, such as Figures 1-2 As shown, the carrier gas inlet 600 is located at one end of the vaporization chamber 200 and is connected to the interior of the vaporization chamber 200, and is used to transport carrier gas to the interior of the vaporization chamber 200.

[0025] Specifically, such as Figures 1-2 As shown, the heating module is connected to the vaporization chamber 200 and is used to heat the vaporization chamber 200. The heating module includes a heating rod 701 and a temperature sensor (not shown in the figure). The heating rod 701 and the temperature sensor are located inside the vaporization chamber 200 and are used to heat the vaporization chamber 200 and detect the heating temperature. The heated vaporization chamber 200 can quickly vaporize the sample solution.

[0026] Furthermore, such as Figures 1-2As shown, a third conical sealing gasket 801, multiple adjusting shims 802, a sealing gasket 803, and a fourth conical sealing gasket 804 are sequentially arranged between the first conical sealing gasket 403 and the cylinder chamber 100. The third conical sealing gasket 801, the sealing gasket 803, and the fourth conical sealing gasket 804 serve a sealing function, and the position of the surface groove 501 of the injection needle 500 can be controlled by adjusting the number of the multiple adjusting shims 802.

[0027] Furthermore, such as Figures 1-2 As shown, a liquid injection valve according to an embodiment of the present invention further includes: two quick-connect fittings 103, which are respectively disposed on two air inlets 102 to facilitate connection with external air intake equipment.

[0028] Furthermore, such as Figures 1-2 As shown, a liquid injection valve according to an embodiment of the present invention further includes: a flow guide sleeve 805, which is disposed inside the injection chamber 400 and sleeved on the other end of the injection needle 500. The flow guide sleeve 805 is connected to the carrier gas inlet 600 and is used for flow guidance. When the injection needle 500 delivers the liquid solution into the flow guide sleeve 805, it will be vaporized and then the sample will flow out through the carrier gas delivered by the carrier gas inlet 600.

[0029] Furthermore, such as Figures 1-2 As shown, a liquid injection valve according to an embodiment of the present invention further includes: a discharge connector 806, which is disposed at the outlet of the vaporization chamber 200 to facilitate connection with a corresponding external pipeline.

[0030] Furthermore, such as Figures 1-2 As shown, a liquid injection valve according to an embodiment of the present invention further includes: an injection connector 807 and an outlet connector 808. The injection connector 807 is disposed at the end of the injection tube 401, and the outlet connector 808 is disposed at the end of the outlet tube 402, so as to facilitate connection with the corresponding external pipeline.

[0031] Furthermore, such as Figures 1-2 As shown, a liquid injection valve according to an embodiment of the present invention further includes: a mounting bracket 809, which is connected to the vaporization chamber 200 and is used to fix the liquid injection valve in a designated location.

[0032] Working principle: After being introduced through the injection connector 807, the liquid sample is transported to the injection chamber 400 through the injection tube 401 and flows through the micro-section annular groove 501 on the injection needle 500 to maintain a certain flow rate.

[0033] Upon receiving a sampling command, gas is injected into the cylinder chamber 100, driving the injection needle 500 forward. The micro-section groove 501 of the injection needle 500 carries a microliter (μL) level liquid sample into the guide sleeve 805, where it is vaporized. Carrier gas is then introduced through the carrier gas inlet 600 and flows out through the guide sleeve 805. The flowing carrier gas carries the sample out and delivers it to the chromatographic column. After the sampling operation is completed, gas is injected into the cylinder chamber 100 in the reverse direction, and the injection needle 500 moves backward to reset, completing one sampling operation.

[0034] Above, refer to Figures 1-3 A liquid injection valve according to an embodiment of the present invention is described, wherein a groove 501 with a small cross section is formed on the surface of the injection needle 500. The groove 501 with a small cross section can carry a microliter (μL) level liquid sample into the guide sleeve 805, and carry the microliter (μL) level liquid sample out through the flowing carrier gas and send it to the chromatographic column, thus meeting the needs of micro-sampling.

[0035] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A liquid injection valve, characterized in that, Include: A cylinder chamber, the interior of which is equipped with a piston and two air inlets; A vaporization chamber is located on one side of the cylinder chamber, and an outlet is provided at one end of the vaporization chamber; A connecting cover, the connecting cover being connected between the cylinder chamber and the vaporization chamber; The sample inlet chamber is located inside the connecting cover. The top and bottom of the sample inlet chamber are respectively connected to the sample inlet tube and the sample outlet tube. A first conical sealing gasket and a second conical sealing gasket are provided between the sample inlet chamber and the cylinder chamber and the vaporization chamber. The injection needle has one end connected to the piston and the other end passing through the cylinder chamber, the first conical sealing gasket, the injection chamber, and the second conical sealing gasket in sequence, and is inserted into the vaporization chamber. The surface of the injection needle is provided with grooves. A carrier gas inlet is provided at one end of the vaporization chamber and communicates with the interior of the vaporization chamber. A heating module is connected to the vaporization chamber and is used to heat the vaporization chamber.

2. The liquid injection valve as described in claim 1, characterized in that, A third conical sealing gasket, multiple adjusting gaskets, sealing gaskets, and a fourth conical sealing gasket are sequentially arranged between the first conical sealing gasket and the cylinder chamber.

3. The liquid injection valve as described in claim 1, characterized in that, It also includes: two quick-connect fittings, which are respectively disposed on the two air inlets.

4. The liquid injection valve as described in claim 1, characterized in that, It also includes: a flow guide sleeve, which is disposed inside the injection chamber and sleeved on the other end of the injection needle, and the flow guide sleeve is connected to the carrier gas inlet.

5. The liquid injection valve as described in claim 1, characterized in that, The heating module includes a heating rod and a temperature sensor, which are disposed inside the vaporization chamber for heating the vaporization chamber and detecting the heating temperature.

6. The liquid injection valve as described in claim 1, characterized in that, It also includes: a discharge connector, which is disposed at the outlet of the vaporization chamber.

7. The liquid injection valve as described in claim 1, characterized in that, It also includes: an inlet connector and an outlet connector, wherein the inlet connector is disposed at the end of the inlet tube and the outlet connector is disposed at the end of the outlet tube.

8. The liquid injection valve as described in claim 1, characterized in that, It also includes: a mounting bracket connected to the vaporization chamber.

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