A gas purity detection device

Abstract

This invention relates to the field of gas detection technology, specifically to a gas purity detection device, comprising a sealed housing, a quartz tube, pressurized electrodes, a transmission plate, a light collector, and a power supply. The sealed housing is divided into a first sealed cavity and a second sealed cavity by an isolation plate, which has a transmission channel. The quartz tube is located within the first sealed cavity, and its outline shadow overlaps with the transmission channel shadow from the perspective of the transmission channel's extension direction. The quartz tube is used to contain the gas to be tested. Two pressurized electrodes are connected to the quartz tube and arranged at intervals. The power supply lines of the pressurized electrodes pass through the isolation plate and are located within the second sealed cavity. The transmission plate is located within the second sealed cavity and covers the transmission channel. The light collector is arranged directly opposite the transmission channel within the second sealed cavity. The power supply is connected to the power supply lines of the pressurized electrodes within the second sealed cavity. This invention offers high safety and is suitable for detecting the purity of high-purity combustible gases.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, and more specifically, to a gas purity detection device. Background Technology

[0002] A gas sensor is a converter that transforms the volume fraction of a gas into a corresponding electrical signal. It mainly includes several categories: semiconductor gas sensors, solid electrolyte gas sensors, contact combustion gas sensors, electrochemical gas sensors, and optical gas sensors.

[0003] Among them, the photoionization detector is a testing instrument that uses ultraviolet light to ionize gas molecules, and then detects changes in gas concentration by detecting a weak current in the detection path. Typically, the gas to be tested is drawn into the ionization chamber, where it is ionized by the ultraviolet lamp to form ions. Under the influence of the electrode voltage, the ions move directionally, generating a weak current. Under fixed external conditions (ionization chamber structure, ultraviolet lamp intensity), the magnitude of the current has a linear relationship with the gas concentration.

[0004] For example, Chinese utility model patent CN214408791U discloses a photoelectroionization sensor for detecting gas concentration. This sensor body includes a gas flow area and an information processing area; at least two ultraviolet light windows are provided on an ultraviolet lamp module, which is positioned within the gas flow area. These windows emit ultraviolet light after the ultraviolet light source is generated by the lamp module; at least two ion current receiving electrode pairs are installed within the gas flow area; at least two amplification circuits, each with a different resistance, are installed within the information processing area, and the ion current receiving electrode pairs are connected to these amplification circuits; and an output module is located within the information processing area and connected to the amplification circuits. This design increases the overall reliable detection range of the photoelectroionization sensor while maintaining detection accuracy within the expanded range.

[0005] However, the gas to be tested in this detector needs to be in direct contact with the ion current receiving electrode. In some high-purity combustible gas detection environments, this detection mode is unreliable and not safe enough. Summary of the Invention

[0006] This invention provides a gas purity detection device that uses quartz to isolate the gas to be tested from the electrodes. At the same time, it utilizes the fire resistance and flame retardancy of quartz and its conductivity under a high electric field to form static electrodes at both ends of the gas to be tested, so as to ionize the gas. The purity of the gas to be tested is detected by utilizing the light stripe information generated when the gas is ionized. This achieves complete isolation between the electrical detection part and the gas to be tested part, ensuring higher safety.

[0007] This invention is achieved through the following technical solution:

[0008] A gas purity detection device, comprising:

[0009] A sealed housing, wherein an isolation plate is provided inside the sealed housing to divide it into a first sealed cavity and a second sealed cavity, and a transmission channel is provided on the isolation plate to connect the first sealed cavity and the second sealed cavity;

[0010] The quartz tube located in the first sealed cavity has an outline shadow that overlaps with the outline shadow of the transmission channel from the perspective of the extension direction of the transmission channel. The quartz tube is used to contain the gas to be measured.

[0011] Two pressure electrodes are respectively connected to the quartz tube and arranged at intervals. The power connection line of the pressure electrodes passes through the isolation plate and is located in the second sealed cavity.

[0012] A transmission plate located within the second sealed cavity, the transmission plate covering the transmission channel;

[0013] A light collector is located inside the second sealed cavity, and the light collector is arranged facing the transmission channel.

[0014] A power source located within the second sealed cavity is connected to the power supply line of the pressurized electrode to provide power.

[0015] In some embodiments, a focusing device is disposed inside the first sealed cavity, facing the transmission channel.

[0016] In some embodiments, the length of the reflective surface of the focuser is greater than or equal to the distance between the two pressurized electrodes.

[0017] In some embodiments, the length of the reflective surface of the focuser is equal to the distance between the two pressurized electrodes.

[0018] In some embodiments, the pressure electrode is formed by coating the outside of the quartz tube with a conductive layer and sintering a quartz protective layer.

[0019] In some embodiments, the power connection line is connected to the conductive layer and fitted with a quartz protective tube, wherein the quartz protective tube is sintered with the quartz protective layer.

[0020] In some embodiments, a fastening package formed by sintering is provided between the transmission plate and the isolation plate, wherein the quartz protective tube is sintered with the isolation plate, and the power connection line passes through the fastening package.

[0021] In some embodiments, the conductive layer is a metal powder layer or a metal slurry.

[0022] In some embodiments, a light transmission channel is provided between the light collector and the transmission plate, wherein the inner wall of the light transmission channel is provided with a black coating.

[0023] In some embodiments, quartz sealing brackets are provided at both ends of the quartz tube, and the quartz sealing brackets are used to connect the air inlet pipe or the air outlet pipe.

[0024] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0025] This invention provides a gas purity detection device. When a high-voltage, high-frequency current is applied to the pressure electrodes, a high-intensity electric field is formed between the two pressure electrodes. At this time, the resistivity of the quartz tube decreases, and its conductivity increases. That is, two static electrodes can be formed on the part of the quartz tube corresponding to the pressure electrodes. The gas to be tested located between the two static electrodes inside the quartz tube can then ionize, generating light stripe information. The light stripes are carried by a transmission plate after passing through a transmission channel, and then collected by a light collector, which can simultaneously acquire the light intensity information of the light stripes. The purity of the gas to be tested can be determined based on the light intensity. During the detection process, the pressure electrodes and the gas to be tested do not come into direct contact; instead, they are completely isolated by the quartz tube. The quartz tube has good fire resistance and high-temperature resistance, resulting in a safer detection environment. Furthermore, the purity of the gas to be tested is no longer detected by the weak current it generates, but by the light stripe information it produces. The gas to be tested does not come into contact with external components throughout the entire detection process, greatly improving safety and making it suitable for high-purity combustible gas detection environments. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the gas purity detection device provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the pressure electrode structure provided in an embodiment of the present invention.

[0029] The attached diagram shows the markings and corresponding component names:

[0030] 1-First sealed cavity, 2-Second sealed cavity, 3-Isolation plate, 4-Quartz tube, 5-Pressure electrode, 51-Quartz protective layer, 52-Conductive layer, 53-Quartz protective tube, 54-Power connection line, 6-Transmission plate, 7-Light collector, 8-Power supply, 9-Focusing device, 10-Fastening package, 11-Light transmission channel, 12-Quartz sealing bracket, 13-Transmission channel. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0032] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known structures, circuits, materials, or methods have not been specifically described in order to avoid obscuring the invention.

[0033] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] In the description of this invention, the terms "front," "rear," "left," "right," "up," "down," "vertical," "horizontal," "high," "low," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0035] like Figures 1-2As shown, this embodiment of the invention provides a gas purity detection device, which includes a sealed housing, a quartz tube 4, a pressurizing electrode 5, a transmission plate 6, a light collector 7, and a power supply 8. An isolation plate 3 is disposed within the sealed housing, dividing it into a first sealed cavity 1 and a second sealed cavity 2. A transmission channel 13 is provided on the isolation plate 3 to connect the first sealed cavity 1 and the second sealed cavity 2. The quartz tube 4 is located within the first sealed cavity 1. From the perspective of the extension direction of the transmission channel 13, the outline shadow of the quartz tube 4 and the transmission channel 13 are intersected. The outline of 3 overlaps with the quartz tube 4, which is used to contain the gas to be measured; two pressurizing electrodes 5 are connected to the quartz tube 4 and are arranged at intervals; the power supply line 54 of the pressurizing electrode 5 passes through the isolation plate 3 and is located in the second sealed cavity 2; the transmission plate 6 is located in the second sealed cavity 2 and covers the transmission channel 13; the light collector 7 is located in the second sealed cavity 2 and is arranged opposite to the transmission channel 13; the power supply 8 is located in the second sealed cavity 2 and is connected to the power supply line 54 of the pressurizing electrode 5 to provide power.

[0036] During operation, the two pressurized electrodes 5 can form a strong electric field under the supply of high frequency and high voltage. At this time, the resistivity of the quartz tube 4 decreases, and electrical conduction is formed between the pressurized electrodes 5 and the quartz tube 4. The two pressurized electrodes 5 can form a breakdown voltage under high voltage and high frequency conditions, causing the gas in the quartz tube 4 to ionize. The gas releases energy in the ionized state to form light stripes. The light stripes pass through the quartz tube 4 and through the transmission channel 13 to reach the transmission plate 6. The light stripe information on the transmission plate 6 is collected by the light collector 7 for subsequent processing.

[0037] In one possible implementation, the light collector 7 can be configured as a photoelectric sensor. This sensor detects the intensity of the light stripes. Higher gas purity results in greater light intensity from ionization, while higher impurities in the gas lead to lower intensity stripes. Therefore, gas purity can be characterized by detecting the intensity of the light stripes. Specifically, experiments can be conducted beforehand with gases of varying purities, recording the intensity of the light stripes produced by each purity. The correlation between the light stripe intensity and gas purity can then be established. Finally, the gas purity can be obtained by directly detecting the intensity of the light stripes on-site. Optionally, a display screen can be configured on the photoelectric sensor to display and record the light intensity data and the converted purity data for easy observation by staff.

[0038] The gas purity detection device provided in this application embodiment does not have direct contact with the gas when the gas is ionized. Instead, it detects the light stripes generated by the gas. The electrical part and the gas to be tested are completely isolated, which has a high safety factor and is suitable for on-site testing environments.

[0039] In this embodiment, a quartz tube 4 is used as the container for the gas to be tested. It has high transparency, and under constant temperature conditions, the resistivity of the quartz tube 4 can be changed by controlling the electric field. For example, when a high-intensity electric field is generated between the two pressurized electrodes, the resistivity of the quartz tube 4 decreases, and a high-frequency electric field can be formed inside the quartz tube 4, causing the gas to ionize. When a low-intensity electric field or no electric field is generated between the two pressurized electrodes, the resistivity of the quartz tube 4 increases, and a low-frequency electric field or even no electric field may be formed inside the quartz tube 4, leaving the gas unaffected. Therefore, when testing is required, the gas can be stopped, so that the gas remains inside the quartz tube 4; when testing is not required, the quartz tube 4 can serve as a gas transmission channel. In this case, even if there is leakage / ionization charge on the pressure electrode, the gas inside the quartz tube 4 will not be affected due to the high resistivity of the quartz tube 4. That is, the quartz tube 4 used in this embodiment can not only play a role during testing, but also serve as a transmission channel when not testing, without the need to remove the electrical testing components, thus exhibiting high practicality and convenience. Of course, the ionized gas in the quartz tube 4 can be separated by a subsequent diversion channel, that is, the ionized gas can be separated from the normally transmitted gas. This can be achieved using a commonly used diversion valve, which will not be elaborated here.

[0040] In this embodiment, the pressure electrode and the power supply 8 are connected by a power connection line 54. This results in higher control precision of the voltage and frequency of the pressure electrode, a more stable electric field, and more accurate purity measurement results.

[0041] In specific implementation, the sealing shell can be set as an explosion-proof shell, such as an alloy steel shell, a stainless steel shell, or a cast aluminum alloy shell. In this embodiment, a stainless steel shell is preferred to reduce the impact of corrosion on structural strength / explosion-proof effect. Of course, the isolation plate 3 inside the sealing shell can also be set as a stainless steel plate. The isolation plate 3 can divide the sealing shell into a larger second sealed cavity 2 and a smaller first sealed cavity 1. The first sealed cavity 1 can be used to set the object to be tested, and the second sealed cavity 2 can be used to set the detection element / detection component. The transmission channel 13 on the isolation plate 3 can be set as a circle. Both ends of the quartz tube 4 can be connected to the outside of the first sealed cavity 1 through air pipes. The air pipes are sealed with the sealing shell. From the perspective of the length direction of the transmission channel 13, the axis of the quartz tube 4 can intersect the axis of the transmission channel 13 perpendicularly.

[0042] In some embodiments, a focuser 9 can be provided inside the first sealed cavity 1 to focus the light stripes generated by gas ionization, so that the light stripe information on the transmission plate 6 is clearer. Specifically, the focuser 9 can be fixedly mounted on the sealed housing, and the center of the reflective surface of the focuser 9 is located on the axis of the transmission channel 13, that is, the reflective surface of the focuser 9 is arranged facing the transmission channel 13.

[0043] To ensure sufficient focusing of the light stripes generated by gas ionization between the pressurized electrodes, in some embodiments, the length of the reflecting surface of the focuser 9 is greater than or equal to the distance between the two pressurized electrodes 5. Specifically, the reflecting surface of the focuser 9 is typically constructed as an ellipse, and the length of the reflecting surface is the length of its major axis, meaning the major axis of the reflecting surface of the focuser 9 is arranged parallel to the axis of the quartz tube 4. The distance between the two pressurized electrodes 5 is the distance between the two electrical connection points formed by the pressurized electrodes 5 and the quartz tube 4. Of course, if the emitting surface of the focuser 9 is too long, it may focus some unnecessary light rays, thus affecting the measurement results. Therefore, the preferred configuration is that the length of the reflecting surface of the focuser 9 is equal to the distance between the two pressurized electrodes 5.

[0044] In some embodiments, the pressure electrode 5 may include a conductive layer 52 and a quartz protective layer 51. The conductive layer 52 may be made of metal powder or metal slurry. The conductive layer 52 may be coated around the quartz tube 4, and then a layer of quartz is sintered on the outside of the conductive layer 52 to form the quartz protective layer 51. This ensures that the conductive layer 52 is in a sealed environment and prevents the conductive layer 52 from contacting the external space. Of course, before sintering the quartz protective layer 51, the power connection line 54 of the pressure electrode 5 may be led out from the conductive layer 52. A quartz protective tube 53 may also be sleeved on the outside of the power connection line 54 of the pressure electrode 5. One end of the quartz protective tube 53 is sintered to the quartz protective layer 51, and the other end of the quartz protective tube 53 passes through the isolation plate 3 and is located in the second sealed cavity 2 to be connected to the power supply 8 in the second sealed cavity 2.

[0045] In some embodiments, the transmission plate 6 can be a quartz plate, which has high transparency and is fire-resistant and high-temperature resistant, ensuring good safety while providing good transmission effect. Specifically, the quartz plate and the isolation plate 3 can be welded together, and a fastening package 10 can be connected between the side wall of the quartz plate and the isolation plate 3. The fastening package 10 is sintered with both the quartz plate and the isolation plate 3, which ensures good sealing between the quartz plate and the isolation plate 3, thereby achieving fireproof and explosion-proof effects and ensuring safety in use.

[0046] In some embodiments, a light transmission channel 11 can be provided between the light collector 7 and the transmission plate 6. The light transmission channel 11 can be a fireproof tube, and a black coating can be provided on the inner wall of the light transmission channel 11 to prevent it from reflecting light, thereby making the light stripe information received by the light collector 7 more accurate, thus ensuring the accuracy of the measurement results.

[0047] In some embodiments, quartz sealing brackets 12 can be provided at both ends of the quartz tube 4, and the quartz sealing brackets 12 are provided with connecting parts for connecting the air inlet pipe and the air outlet pipe. By providing the quartz sealing brackets 12, the connection part between the air inlet pipe or the air outlet pipe and the quartz tube 4 can have better sealing performance and fire resistance and high temperature resistance, thereby improving the safety of use.

[0048] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A gas purity detection device, characterized by comprising: The utility model relates to a sealed shell is provided with the partition (3) that divides it into first closed cavity (1) and second closed cavity (2) in it, be provided with transmission channel (13) on the partition (3) to communicate first closed cavity (1) and second closed cavity (2), wherein, first closed cavity (1) is provided with the focuser (9) of being opposite transmission channel (13) arrangement in it; Quartz tube (4) in the first closed cavity (1) body, in the visual angle of transmission channel (13) extension direction, the outline shadow of quartz tube (4) has the overlap with the outline shadow of transmission channel (13), quartz tube (4) is used to contain the gas to be measured; Pressurized electrode (5) is formed by coating conductive layer (52) outside quartz tube (4) and sintering quartz protective layer (51), two pressurized electrode (5) are connected with quartz tube (4) respectively and interval arrangement, the power connection wire (54) of pressurized electrode (5) passes through the partition (3) and is located in the second closed cavity (2) in, wherein, the power connection wire (54) is connected with conductive layer (52) and is provided with quartz protection tube (53), quartz protection tube (53) is sintered with quartz protective layer (51); Transmission plate (6) in the second closed cavity (2) body, transmission plate (6) covers transmission channel (13); Light collector (7) in the second closed cavity (2) body, light collector (7) is opposite transmission channel (13) arrangement, light collector (7) is configured with light transmission channel (11) between transmission plate (6), wherein, black coating is provided on the inner wall of light transmission channel (11); Power supply (8) in the second closed cavity (2) body, power supply (8) is connected with the power connection wire (54) of pressurized electrode (5) to power supply. The length of the reflecting surface of the focuser (9) is greater than or equal to the distance between the two pressurized electrodes (5).

2. The gas purity detection apparatus according to claim 1, characterized by The length of the reflecting surface of the focuser (9) is equal to the distance between the two pressurized electrodes (5).

3. The gas purity detection apparatus according to claim 2, characterized by A fastening package (10) is provided between the transmission plate (6) and the partition (3) and is formed by sintering, wherein the quartz protection tube (53) is sintered with the partition (3), and the power connection wire (54) passes through the fastening package (10).

4. The gas purity detection apparatus according to claim 1, characterized by The conductive layer (52) is a metal powder layer or a metal slurry.

5. The gas purity detection apparatus according to claim 1, wherein Quartz sealing sockets (12) are provided at both ends of the quartz tube (4) to connect the gas inlet pipe or the gas outlet pipe.

6. The gas purity detection apparatus according to claim 1, wherein ​

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