A hydrogen flame detector

Abstract

The utility model discloses a hydrogen flame detector contains: shell, shell is by first casing and second casing splicing composition, insulating board is set up in the top of second casing, sample tube, one end of sample tube penetrates insulating board, second casing in proper order, inserts into first casing, nozzle, nozzle is located inside first casing, is equipped with the connecting pipe on the nozzle, and the connecting pipe is linked with one end of sample tube, ignition coil, ignition coil is located the output end place of nozzle, and both ends of ignition coil all penetrate second casing, signal transmission module, signal transmission module is linked with the connecting pipe on the nozzle for transmission signal, combustion-supporting module, combustion-supporting module is linked with one side of first casing, discharge pipe, one end of discharge pipe penetrates the other side of first casing, and inserts into first casing. The utility model realizes more optimal structure layout to improve the convenience of dismounting maintenance, provides more reliable electrical insulation and signal transmission path to effectively suppress the interference.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen flame detector technology, and in particular to a hydrogen flame detector. Background Technology

[0002] The flame ionization detector (FID) is a versatile and highly sensitive detector used in gas chromatography. Its working principle is based on the chemical ionization of organic matter during combustion in a hydrogen flame, producing ions and electrons. By applying an electric field near the flame, these ions can be collected to form a microcurrent signal. The magnitude of this signal is proportional to the mass flow rate of the organic matter entering the flame, thus enabling quantitative analysis of the sample.

[0003] Existing hydrogen flame detectors typically include a housing, a nozzle (as a polarizing electrode), a collecting electrode, an ignition device, gas pipelines, and signal transmission components. Although the technology is relatively mature, existing designs still have some inherent shortcomings in practical applications, especially in situations requiring high stability, ease of maintenance, and miniaturization.

[0004] Firstly, in terms of structural layout, many traditional hydrogen flame detectors mount the collecting electrode (usually a metal cylinder) directly inside the combustion chamber and surround the nozzle. While this structure is beneficial for ion collection, it also leads to cramped internal space and inconvenient disassembly and assembly of parts. When the detector needs cleaning or replacement of critical components such as the nozzle or collecting electrode, the operation is very cumbersome. Positioning deviations during disassembly and reassembly can easily affect the relative positional accuracy between the nozzle and the collecting electrode, resulting in fluctuations in the signal baseline and a decrease in sensitivity, thus affecting the long-term stability of the detection. Summary of the Invention

[0005] According to an embodiment of the present invention, a hydrogen flame detector is provided, comprising: The outer shell is composed of a first shell and a second shell joined together. An insulating plate is disposed on top of the second housing; The sample inlet tube has one end that passes through the insulating plate and the second housing in sequence, and is inserted into the first housing. The nozzle is located inside the first housing and is equipped with a connecting tube that is connected to one end of the sample inlet tube. Ignition coil, located at the output end of the nozzle, with both ends of the ignition coil penetrating the second housing; The signal transmission module is connected to the connecting pipe on the nozzle and is used to transmit signals. A combustion-supporting module is connected to one side of the first housing and is used to input combustion-supporting air into the first housing; The discharge pipe has one end that passes through the other side of the first housing and is inserted into the first housing.

[0006] Furthermore, it also includes: Thermocouple, the thermocouple is inserted into the inside of the first housing, and the two terminals of the thermocouple are connected to the first metal connector; The bracket is fixed to the first housing; The first connector is mounted on the bracket and is connected to the two terminals of the thermocouple via a first metal connector.

[0007] Furthermore, the combustion-supporting module includes: A metal retaining ring is provided on one side of the first housing; Cover plate, the cover plate is set on the metal limit ring; A metal filter screen is installed between the metal retaining ring and the cover plate. The inlet pipe has one end that passes through the cover plate.

[0008] Furthermore, it also includes: Two terminals are located on the second housing and are connected to both ends of the ignition coil. Two copper wires, one end of each copper wire is connected to two terminals, and the other end of each copper wire is connected to a second metal connector. The second connector is located on the insulating board and is connected to the other end of the two copper wires via a second metal connector.

[0009] Furthermore, the signal transmission module includes: Signal connector, the signal connector is mounted on the insulating board; An insulating sleeve is disposed on the second housing. The transmission rod is located inside the insulating sleeve, and its top end is connected to the signal connector. The connecting sleeve is connected to the bottom end of the transmission rod. The connecting tube is wound around the connecting sleeve, and the connecting sleeve is equipped with a locking nut and a washer for fixing the connecting tube.

[0010] Furthermore, it also includes: an installation sleeve, which is fitted onto the injection tube, with a limiting ring at the bottom of the installation sleeve and a clamping nut connected to the top of the installation sleeve.

[0011] Furthermore, it also includes a sealing ring disposed between the first housing and the second housing.

[0012] According to an embodiment of the present invention, a hydrogen flame detector achieves a more optimized structural layout to improve the convenience of disassembly and maintenance; and provides more reliable electrical insulation and signal transmission path to effectively suppress interference.

[0013] 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

[0014] Figure 1 This is a schematic cross-sectional view of a hydrogen flame detector according to an embodiment of the present invention. Figure 1 .

[0015] Figure 2 This is a schematic cross-sectional view of a hydrogen flame detector according to an embodiment of the present invention. Figure 2 .

[0016] Figure 3 This is a three-dimensional structural diagram of a hydrogen flame detector according to an embodiment of the present invention.

[0017] Figure 4 This is a schematic diagram of the structure of a hydrogen flame detector when the first housing is removed according to an embodiment of the present invention. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0019] First, combine Figures 1-4 This invention describes a hydrogen flame detector according to an embodiment of the present invention, used for hydrogen flame detection in a chromatograph, and has a wide range of applications.

[0020] like Figures 1-4 As shown, a hydrogen flame detector according to an embodiment of the present invention includes a shell, an insulating plate 200, a sample inlet tube 300, a nozzle 400, an ignition coil 500, a signal transmission module, a combustion-supporting module, and an exhaust tube 800.

[0021] Specifically, such as Figure 1 As shown, the outer shell is composed of a first shell 101 and a second shell 102 joined together.

[0022] Specifically, such as Figures 1-3 As shown, the insulating plate 200 is disposed on the top of the second housing 102 and serves as electrical insulation.

[0023] Specifically, such as Figures 1-2 As shown, one end of the injection tube 300 passes through the insulating plate 200 and the second housing 102 in sequence, and is inserted into the first housing 101. The injection tube 300 is used to deliver the sample + carrier gas (N2) and combustion gas (H2).

[0024] Specifically, such as Figures 1-4As shown, the nozzle 400 is located inside the first housing 101. The nozzle 400 is provided with a connecting pipe 401, which is connected to one end of the sample inlet tube 300. The connecting pipe 401 is a copper pipe.

[0025] Specifically, such as Figures 1-4 As shown, the ignition coil 500 is located at the output end of the nozzle 400, and both ends of the ignition coil 500 penetrate the second housing 102.

[0026] Specifically, such as Figures 1-4 As shown, the signal transmission module is connected to the connecting pipe 401 on the nozzle 400 for transmitting signals.

[0027] Specifically, such as Figures 1-4 As shown, the combustion-supporting module is connected to one side of the first housing 101 and is used to input combustion-supporting air into the first housing 101. The combustion-supporting module includes: a metal limiting ring 701, a cover plate 702, a metal filter screen 703, and an inlet pipe 704. The metal limiting ring 701 is disposed on one side of the first housing 101; the cover plate 702 is disposed on the metal limiting ring 701; the metal filter screen 703 is disposed between the metal limiting ring 701 and the cover plate 702; one end of the inlet pipe 704 penetrates the cover plate 702, and the inlet pipe 704 is used to deliver combustion-supporting air. The metal limiting ring 701 is used to filter impurities entering with the inlet pipe 704 and to achieve the purpose of flame arrest.

[0028] Specifically, such as Figures 1-4 As shown, one end of the discharge pipe 800 passes through the other side of the first housing 101 and is inserted into the first housing 101 to discharge exhaust gas.

[0029] Furthermore, such as Figures 1-4 As shown, a hydrogen flame detector according to an embodiment of this utility model further includes: a thermocouple 901, a bracket 902, and a first connector 903. The thermocouple 901 is inserted into the interior of the first housing 101, and a first metal connector is connected to the two terminals of the thermocouple 901; the bracket 902 is fixed to the first housing 101; the first connector 903 is disposed on the bracket 902, and the first connector 903 is connected to the two terminals of the thermocouple 901 through the first metal connector. The temperature change inside the hydrogen flame detector can be directly observed through the thermocouple 901.

[0030] Furthermore, such as Figures 1-4As shown, a hydrogen flame detector according to an embodiment of the present invention further includes: two terminals 904, two copper wires 905, and a second connector 906. The two terminals 904 are disposed on the second housing 102 and are connected to both ends of the ignition coil 500; one end of each of the two copper wires 905 is connected to one of the two terminals 904, and the other end of each copper wire 905 is connected to a second metal connector; the second connector 906 is disposed on the insulating plate 200 and is connected to the other end of each of the two copper wires 905 via a second metal connector.

[0031] Furthermore, such as Figures 1-4 As shown, the signal transmission module includes: a signal connector 601, an insulating sleeve 602, a transmission rod 603, and a connecting sleeve 604. The signal connector 601 is mounted on the insulating plate 200; the insulating sleeve 602 is mounted on the second housing 102; the transmission rod 603 is located inside the insulating sleeve 602, with its top end connected to the signal connector 601; the connecting sleeve 604 is connected to the bottom end of the transmission rod 603, and a connecting tube 401 is wound around the connecting sleeve 604. The connecting sleeve 604 is equipped with a locking nut 605 and a washer 606 for fixing the connecting tube 401. The connecting tube 401 is used to transmit the ionization current of the flowing carbon atoms measured by the nozzle 400 (collector electrode) sequentially through the connecting sleeve 604 and the transmission rod 603 to the signal connector 601, and finally, the signal connector 601 transmits it to the outside.

[0032] Furthermore, such as Figures 1-4 As shown, a hydrogen flame detector according to an embodiment of the present invention further includes: a mounting sleeve 907, which is sleeved on the sample inlet tube 300, a limiting ring 909 is provided at the bottom of the mounting sleeve 907, and a clamping nut 908 is connected to the top of the mounting sleeve 907.

[0033] Furthermore, such as Figures 1-4 As shown, a hydrogen flame detector according to an embodiment of the present invention further includes a sealing ring, which is disposed between the first housing 101 and the second housing 102 to improve sealing and prevent gas leakage.

[0034] The FID detector utilizes the phenomenon that carbon atoms in the analyte (hydrocarbons) can be ionized in a high-temperature hydrogen flame. A high voltage is applied between the nozzle 400 (collector electrode) and the ignition coil 500 (polarizing electrode) in the flame ionizer. The ion collecting electrode measures the ionization current of the carbon atoms flowing between the electrodes. This ionization current is proportional to the concentration of the analyte.

[0035] Above, refer to Figures 1-4 This invention describes a hydrogen flame detector according to an embodiment of the present invention, which achieves a more optimized structural layout to improve the convenience of disassembly and maintenance; and provides more reliable electrical insulation and signal transmission path to effectively suppress interference.

[0036] 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.

[0037] 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 hydrogen flame detector, characterized in that, Include: The outer casing is composed of a first shell and a second shell joined together. An insulating plate is disposed on the top of the second housing; A sample inlet tube, one end of which passes through the insulating plate and the second housing in sequence, and is inserted into the first housing; A nozzle is located inside the first housing, and a connecting tube is provided on the nozzle, which is connected to one end of the sample inlet tube; An ignition coil is located at the output end of the nozzle, and both ends of the ignition coil penetrate the second housing. A signal transmission module, which is connected to the connecting pipe on the nozzle, is used to transmit signals; A combustion-supporting module, which is connected to one side of the first housing, is used to input combustion-supporting air into the first housing; A discharge pipe, one end of which passes through the other side of the first housing and is inserted into the first housing.

2. The hydrogen flame detector as described in claim 1, characterized in that, Also includes: A thermocouple, wherein the thermocouple is inserted into the interior of the first housing, and a first metal connector is connected to the two terminals of the thermocouple; The bracket is fixed to the first housing; The first connector is disposed on the bracket and is connected to the two terminals of the thermocouple via a first metal connector.

3. The hydrogen flame detector as described in claim 1, characterized in that, The combustion-supporting module includes: A metal retaining ring is disposed on one side of the first housing; Cover plate, the cover plate being disposed on the metal limiting ring; A metal filter screen is disposed between the metal limiting ring and the cover plate; An inlet pipe, one end of which penetrates the cover plate.

4. The hydrogen flame detector as described in claim 1, characterized in that, Also includes: Two terminals are provided on the second housing and are connected to both ends of the ignition coil. Two copper wires, one end of each copper wire is connected to the two terminals respectively, and the other end of each copper wire is connected to a second metal connector; The second connector is disposed on the insulating plate and is connected to the other end of the two copper wires via a second metal connector.

5. The hydrogen flame detector as described in claim 1, characterized in that, The signal transmission module includes: Signal connector, wherein the signal connector is disposed on the insulating plate; An insulating sleeve is disposed on the second housing; A transmission rod is disposed inside the insulating sleeve, and the top end of the transmission rod is connected to the signal connector; A connecting sleeve is connected to the bottom end of the transmission rod, and a connecting tube is wound around the connecting sleeve. The connecting sleeve is provided with a locking nut and a washer for fixing the connecting tube.

6. The hydrogen flame detector as described in claim 1, characterized in that, It also includes: an installation sleeve, which is fitted onto the injection tube, a limiting ring at the bottom of the installation sleeve, and a clamping nut connected to the top of the installation sleeve.

7. The hydrogen flame detector as described in claim 1, characterized in that, It also includes a sealing ring disposed between the first housing and the second housing.

Images