A dynamic DBD detection device for syringes

Abstract

The invention discloses a dynamic DBD detection device for a syringe, and relates to the technical field of detection devices. A needle-shaped electrode is arranged on the inner side of the upper part of a mixing tube, an outer electrode is arranged on the outer side of the upper part of the mixing tube, an air outlet pipe is arranged on one side of the upper part of the mixing tube, a branch pipe is arranged on both sides of the lower part of the mixing tube, a capillary is arranged in an injection tube, the injection tube passes through a branch pipe and extends to the inside of the mixing tube, a base is installed at the bottom of the mixing tube, two side air intake pipes are arranged on both sides of the base, and the two side air intake pipes are both connected to the inside of the mixing tube, a fairing is arranged at the middle part of the upper end of the base, a main air intake channel is arranged in the fairing, the main air intake pipe is arranged at the bottom of the base, the main air intake pipe is connected to the inside of the mixing tube through the main air intake channel, an electric heating wire is arranged between the two branch pipes, and both ends of the bottom of the electric heating wire pass through the base and extend to the outside. The device improves the stability of injection, avoids discharge in the air, and improves the accuracy of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of detection devices, and in particular to a dynamic DBD detection device for a syringe. Background Art

[0002] In the existing detection device, the sampling method is to drip liquid onto the tungsten wire, and then evaporate the gas through electric heating to produce a spectrum. There is a problem of uneven liquid feeding, and the dielectric barrier discharge form of the ring-ring structure is adopted, which is easy to cause discharge in the air. In the process of liquid introduction in the existing technology, the liquid will adhere to the inner wall of the quartz tube, and a memory effect will be produced over a long period of time, reducing the accuracy of the equipment. The traditional gas intake method only introduces one gas, which is used as a sample carrier gas and also a plasma fuel gas. The carrier gas flow rate cannot be controlled independently, and can only be adjusted according to the amount of gas required to ignite the plasma, resulting in a sample carrier gas speed that is too high. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a dynamic DBD detection device for a syringe, which improves the stability of injection, avoids discharge in the air, and improves the accuracy of the equipment.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a dynamic DBD detection device for a syringe, comprising a mixing tube, a base, a fairing, an electric heating wire, a needle electrode, an outer electrode, an injection tube, a capillary, a main air inlet pipe and two side air inlet pipes, wherein the needle electrode is arranged on the inner side of the upper part of the mixing tube, the outer electrode is arranged on the outer side of the upper part of the mixing tube, an air outlet pipe is arranged on one side of the upper part of the mixing tube, a branch pipe is arranged on both sides of the lower part of the mixing tube, the capillary is arranged in the injection tube, the injection tube passes through one of the branch pipes and extends into the interior of the mixing tube, and the base is installed on the mixing tube. The bottom of the tube, the two side air inlet pipes are respectively arranged on both sides of the base, and the two side air inlet pipes are connected with the interior of the mixing tube, the fairing is arranged in the middle of the upper end of the base, and the main air inlet channel is arranged in the fairing, the main air inlet pipe is arranged at the bottom of the base, the main air inlet pipe is connected with the interior of the mixing tube through the main air inlet channel, the main air inlet pipe is used to introduce sample carrier gas, and the side air inlet pipe is used to introduce plasma fuel gas, the electric heating wire is arranged between the two branch pipes, and the bottom ends of the electric heating wire pass through the base to extend to the outside.

[0006] Preferably, the fairing comprises an inverted conical section and a cylindrical section connected in sequence from top to bottom, the main air inlet passage passes through the inverted conical section and the cylindrical section, a groove is provided in the middle of the upper end of the base, and the cylindrical section is installed in the groove.

[0007] Preferably, two side air intake channels are symmetrically arranged on both sides of the base, and the side air intake channels are L-shaped channels, one end of the L-shaped channel is connected to the side air intake pipe, and the other end of the L-shaped channel is connected to the mixing tube, and the end of the L-shaped channel connected to the mixing tube is located below the inverted cone section.

[0008] Preferably, the mixing tube includes a first circular tube, a conical tube and a second circular tube connected in sequence from top to bottom, the inner diameter of the first circular tube is smaller than the inner diameter of the second circular tube, the outer electrode is arranged on the outside of the first circular tube, the air outlet pipe is arranged on one side of the upper part of the first circular tube, and the two branch pipes are respectively arranged on both sides of the second circular tube.

[0009] Preferably, a fixing plug is provided at the top of the mixing tube, and the needle-shaped electrode passes through the fixing plug and extends into the mixing tube.

[0010] Preferably, an injection plug is provided at the outer end of the branch tube, and the injection tube passes through one of the injection plugs and one of the branch tubes and extends into the interior of the mixing tube.

[0011] Preferably, the outer electrode is a copper wire or a copper sheet, and the outer side of the upper portion of the mixing tube is wound with the copper wire or wrapped with the copper sheet.

[0012] Preferably, the electric heating wire is a tungsten wire, the mixing tube is a quartz tube, and the capillary is a drawn capillary.

[0013] Compared with the prior art, the present invention has achieved the following technical effects:

[0014] The invention provides a dynamic DBD detection device for syringes, in which a needle-shaped electrode and an outer electrode form a dielectric barrier discharge form of a needle-ring structure, which avoids discharge phenomena in the air compared with a dielectric barrier discharge form of a ring-ring structure. Electrospray gasification is achieved by cooperating with a capillary and an electric heating wire. The sample solution flows through the capillary and enters the mixing tube. A high-voltage electric field is added to the sample solution in the capillary. Under the action of the Coulomb force, the sample solution is atomized into fine droplets with a charge at the outlet of the capillary and evenly sprayed on the surface of the electric heating wire. The electric heating wire discharges the gas on the surface from the top outlet pipe after being electrically heated. A fairing is used to guide the gas to the inner wall of the tube to form an air curtain, which protects the tube wall, prevents droplets from sputtering to the tube wall to cause pollution, avoids the generation of a memory effect, and improves the accuracy of the equipment. The main air inlet pipe is used to introduce the sample carrier gas, and the side air inlet pipe is used to introduce the plasma fuel gas. The sample carrier gas flow rate can be controlled separately so that the sample does not flow through the plasma zone too quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the structure of a dynamic DBD detection device for a syringe provided by the present invention;

[0017] Figure 2 A cross-sectional view of a dynamic DBD detection device for a syringe provided by the present invention.

[0018] Explanation of the reference numerals: 1. first circular tube; 2. conical tube; 3. second circular tube; 4. fixing plug; 5. needle-shaped electrode; 6. outlet pipe; 7. branch pipe; 8. injection plug; 9. injection tube; 10. capillary tube; 11. electric heating wire; 12. base; 13. fairing; 14. main air intake channel; 15. main air intake pipe; 16. side air intake pipe; 17. side air intake channel. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The purpose of the present invention is to provide a dynamic DBD detection device for a syringe, which improves the stability of sample injection, avoids discharge in the air, and improves the accuracy of the device.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 and Figure 2As shown, this embodiment provides a dynamic DBD detection device for a syringe, including a mixing tube, a base 12, a fairing 13, an electric heating wire 11, a needle electrode 5, an outer electrode, a sample injection tube 9, a capillary 10, a main air intake pipe 15 and two side air intake pipes 16. The needle electrode 5 is arranged on the inner side of the upper part of the mixing tube, and the outer electrode is arranged on the outer side of the upper part of the mixing tube, thereby forming a dielectric barrier discharge form of a needle-ring structure. Specifically, the outer electrode is cylindrical, and the cylindrical outer electrode is sleeved outside the needle electrode 5, and the two are coaxial. Generally, the outer electrode is grounded, and the needle electrode 5 is connected to AC high voltage. Compared with the dielectric barrier discharge form of the ring-ring structure, the discharge phenomenon in the air is avoided. An air outlet pipe 6 is provided on one side of the upper part of the mixing tube, and a branch pipe 7 is provided on both sides of the lower part of the mixing tube respectively. A capillary 10 is provided in the sampling tube 9, and the capillary 10 extends from both ends of the sampling tube 9. The sampling tube 9 passes through a branch pipe 7 and extends into the interior of the mixing tube. The sample solution flows through the capillary 10 and enters the mixing tube. A high-voltage electric field is applied to the sample solution in the capillary 10. Under the action of the Coulomb force, the sample solution will spray at the outlet of the capillary 10, and will be atomized into fine droplets with a charge and evenly sprayed on the surface of the electric heating wire 11. That is, the electrospray injection method is adopted in the present application, so that the sample solution is sprayed evenly.

[0023] The base 12 is installed at the bottom of the mixing tube, and two side air inlet pipes 16 are respectively arranged on both sides of the base 12, and the two side air inlet pipes 16 are connected to the inside of the mixing tube. A fairing 13 is arranged in the middle of the upper end of the base 12. The fairing 13 guides the gas to the inner wall of the tube to form an air curtain, which protects the tube wall, prevents droplets from splashing onto the tube wall to cause pollution, avoids the memory effect, and improves the accuracy of the equipment. A main air inlet channel 14 is arranged in the fairing 13, and a main air inlet pipe 15 is arranged at the bottom of the base 12. The main air inlet pipe 15 is connected to the inside of the mixing tube through the main air inlet channel 14. The main air inlet pipe 15 is used to pass the sample carrier gas, and the sample carrier gas is used to purge the electric heating wire 11. The side air inlet pipe 16 is used to pass the plasma fuel gas, and the plasma fuel gas is used to ignite the plasma. By separating the plasma fuel gas and the sample carrier gas, the sample carrier gas flow rate can be controlled separately, so that the sample does not flow through the plasma area too quickly. The electric heating wire 11 is arranged between the two branch pipes 7 , and both ends of the bottom of the electric heating wire 11 pass through the base 12 and extend to the outside.

[0024] Specifically, the fairing 13 includes an inverted cone section and a cylindrical section connected in sequence from top to bottom, the main air inlet channel 14 runs through the inverted cone section and the cylindrical section, a groove is provided in the middle of the upper end of the base 12, the cylindrical section is installed in the groove, and the cylindrical section is threaded or clamped in the groove. The electric heating wire 11 is located above the main air inlet channel 14, and the sample carrier gas is introduced to more effectively vaporize the sample solution and protect the surface of the electric heating wire 11 to avoid the memory effect.

[0025] Specifically, two side air inlet channels 17 are symmetrically arranged on both sides of the base 12. The side air inlet channels 17 are L-shaped channels. One end of the L-shaped channel is connected to the side air inlet pipe 16, and the other end of the L-shaped channel is connected to the mixing pipe, that is, one side air inlet pipe 16 is connected to the mixing pipe through one L-shaped channel. One end of the L-shaped channel connected to the mixing pipe is located below the inverted cone section, so that the plasma fuel gas entering from the side air inlet pipe 16 through the L-shaped channel is dispersed to both sides along the inverted cone surface, forming a gas curtain that wraps the inner wall of the mixing pipe, preventing tiny droplets from splashing into the pipe wall, and at the same time protecting the pipe wall and preventing pollution.

[0026] Specifically, the mixing tube includes a first circular tube 1, a conical tube 2 and a second circular tube 3 connected in sequence from top to bottom, the inner diameter of the first circular tube 1 is smaller than the inner diameter of the second circular tube 3, the outer electrode is arranged on the outside of the first circular tube 1, the air outlet pipe 6 is arranged on one side of the upper part of the first circular tube 1, the two branch pipes 7 are respectively arranged on both sides of the second circular tube 3, and the base 12 is installed at the bottom of the second circular tube 3.

[0027] A fixing plug 4 is arranged on the top of the mixing tube, and the needle electrode 5 passes through the fixing plug 4 and extends into the mixing tube, and the fixing plug 4 has a fixing and limiting effect on the needle electrode 5. Specifically, the fixing plug 4 is installed on the top of the first round tube 1, and the needle electrode 5 is arranged in the first round tube 1.

[0028] The outer end of the branch pipe 7 is provided with a sampling plug 8, and the sampling tube 9 passes through the sampling plug 8 and the branch pipe 7 to extend into the mixing tube. The sampling plug 8 has a fixed limiting effect on the sampling tube 9.

[0029] In this specific embodiment, the outer electrode is a copper wire or a copper sheet, and the outer side of the upper portion of the mixing tube is wound with the copper wire or wrapped with the copper sheet.

[0030] In this specific embodiment, the electric heating wire 11 is a tungsten wire, the mixing tube is a quartz tube, and the capillary 10 is a drawn capillary.

[0031] It can be seen that in this embodiment, the electrospray injection and the needle-ring structure cooperate with each other. The sample solution in the injection tube 9 is atomized into fine droplets with charge through the capillary 10 and the high voltage electricity, and then sprayed on the surface of the electric heating wire 11. The electric heating wire 11 discharges the gas on the surface from the top outlet pipe 6 after being electrically heated. There are two air intakes on the base 12. One is in the middle, which is the sample carrier gas, which can better purge the gas on the electric heating wire 11 and is conducive to controlling the sample injection speed separately; the other is on both sides of the base 12. The plasma fuel gas enters the inner wall of the mixing tube to form a gas curtain around the tube wall, and the flow rate can be adjusted separately to provide fuel gas for the plasma, while protecting the tube wall and preventing pollution.

[0032] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A dynamic DBD detection device for a syringe, characterized in that: The invention comprises a mixing tube, a base, a fairing, an electric heating wire, a needle electrode, an outer electrode, an injection tube, a capillary, a main air inlet pipe and two side air inlet pipes, wherein the needle electrode is arranged on the inner side of the upper part of the mixing tube, the outer electrode is arranged on the outer side of the upper part of the mixing tube, an air outlet pipe is arranged on one side of the upper part of the mixing tube, a branch pipe is arranged on both sides of the lower part of the mixing tube, the capillary is arranged in the injection tube, the capillary extends from both ends of the injection tube, the injection tube passes through one of the branch pipes and extends into the mixing tube, the sample solution flows through the capillary into the mixing tube, and the sample solution in the capillary is discharged from the sample tube. A high voltage electric field is added to the sample solution. Under the action of Coulomb force, the sample solution will spray at the outlet of the capillary and be atomized into fine droplets with electric charge and evenly sprayed on the surface of the electric heating wire; the base is installed at the bottom of the mixing tube, and the two side air inlet pipes are respectively arranged on both sides of the base, and the two side air inlet pipes are connected to the inside of the mixing tube. The fairing is arranged in the middle of the upper end of the base. The fairing guides the gas to the inner wall of the tube to form an air curtain, which protects the tube wall and prevents droplets from splashing onto the tube wall to cause pollution. The main air inlet channel is arranged in the fairing. The tube is arranged at the bottom of the base, the main air intake pipe is connected with the inside of the mixing tube through the main air intake channel, the main air intake pipe is used to introduce sample carrier gas, and the side air intake pipe is used to introduce plasma fuel gas. The electric heating wire is arranged between the two branch pipes, and both ends of the bottom of the electric heating wire pass through the base to extend to the outside; the fairing includes an inverted cone section and a cylindrical section connected in sequence from top to bottom, the main air intake channel runs through the inverted cone section and the cylindrical section, a groove is arranged in the middle of the upper end of the base, and the cylindrical section is installed in the groove; two side air intake channels are symmetrically arranged on both sides of the base, The side air intake channel is an L-shaped channel, one end of the L-shaped channel is connected to the side air intake pipe, the other end of the L-shaped channel is connected to the mixing tube, and the end of the L-shaped channel connected to the mixing tube is located below the inverted cone section; the mixing tube includes a first circular tube, a conical tube and a second circular tube connected in sequence from top to bottom, the inner diameter of the first circular tube is smaller than the inner diameter of the second circular tube, the outer electrode is arranged on the outside of the first circular tube, the air outlet pipe is arranged on one side of the upper part of the first circular tube, the two branch pipes are respectively arranged on both sides of the second circular tube, and the base is installed at the bottom of the second circular tube.

2. The dynamic DBD detection device for syringes according to claim 1, characterized in that: A fixing plug is arranged on the top of the mixing tube, and the needle-shaped electrode passes through the fixing plug and extends into the mixing tube.

3. The dynamic DBD detection device for syringes according to claim 1, characterized in that: The outer end of the branch pipe is provided with a sample injection plug, and the sample injection tube passes through one of the sample injection plugs and one of the branch pipes and extends into the interior of the mixing tube.

4. The dynamic DBD detection device for syringes according to claim 1, characterized in that: The outer electrode is a copper wire or a copper sheet, and the outer side of the upper portion of the mixing tube is wound with the copper wire or wrapped with the copper sheet.

5. The dynamic DBD detection device for syringes according to claim 1, characterized in that: The electric heating wire is a tungsten wire, the mixing tube is a quartz tube, and the capillary is a drawn capillary.

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