CN218917278U

CN218917278U - Signal detector and gas sensor

Info

Publication number: CN218917278U
Application number: CN202220430250.9U
Authority: CN
Inventors: 陈冰; 苏爱民
Original assignee: Shanghai Genkuai Technology Co ltd
Current assignee: Shanghai Genkuai Technology Co ltd
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2023-04-25
Anticipated expiration: 2032-03-01

Abstract

The utility model provides a signal detector and a gas sensor. The signal detector comprises a first shell, a second shell, a bias electrode, an insulating gasket and a signal electrode, wherein openings corresponding to each other are formed in the first shell and the second shell, the bias electrode, the insulating gasket and the signal electrode are sequentially overlapped up and down and are commonly located in a space formed by up-down sealing connection of the first shell and the second shell, the bias electrode, the insulating gasket and the signal electrode are all provided with the openings, and the ratio of the sum of the areas of all the openings to the illuminated area on the bias electrode is smaller than 10%. According to the method, through the improved structural design, the total area of the holes in the bias electrode is reduced as much as possible, the incidence total amount of ultraviolet light entering the ionization chamber through the bias electrode is controlled on the premise that measurement is not affected, ultraviolet light energy entering the signal detector can be greatly reduced, the etching speed of the insulating gasket is slowed down, the service life of the signal detector is prolonged, and meanwhile the performance of the detector can be improved.

Description

Signal detector and gas sensor

Technical Field

The present utility model relates to the field of gas detection technologies, and in particular, to a signal detector and a gas sensor.

Background

The signal detector is mainly applied to a photo-ion detection sensor such as PID (Photo Ionization Detectors, photo-ion detector) and GC (gas chromatography). The PID sensor is used as a professional sensor for detecting VOC (volatile organic compounds ) in the fields of environmental protection and industrial safety, has the advantages of small volume, high response speed, high precision, continuous measurement and the like, and can detect VOC and other toxic and harmful gases from extremely low concentration of 1ppb to higher concentration of tens of thousands of ppm. Currently, PID sensors are widely used in detection of various organic chemicals, and particularly play an important role in disaster area accident leakage detection, accident area confirmation, leakage confirmation and the like. When the PID sensor is in a working state, as the signal detector is directly exposed to high ultraviolet radiation, high ozone concentration and high VOC environment, whether the materials used by the detector can be kept stable becomes a key factor of whether the whole sensor can be stable or not, and the existing gas sensor cannot meet the requirement of long-term stable operation of the sensor due to various defects existing in the structure and/or materials.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a signal detector and a gas sensor for solving the problems that it is difficult for the gas sensor in the prior art to maintain long-term stable operation in an environment of high ultraviolet radiation, high ozone concentration, and high VOC.

In order to achieve the above and other related objects, the present utility model provides a signal detector, including a first housing, a second housing, a bias electrode, an insulating spacer, and a signal electrode, where openings corresponding to each other are provided on the first housing and the second housing, the bias electrode, the insulating spacer, and the signal electrode are stacked up and down in sequence and are located together in a space formed by sealing connection of the first housing and the second housing, and a plurality of openings are provided on the bias electrode, the insulating spacer, and the signal electrode, where a ratio of a sum of areas of all openings on the bias electrode to an illuminated area is less than 10%.

Optionally, the ratio of the sum of the areas of all the openings on the bias electrode to the illuminated area is greater than or equal to 0.01%.

Optionally, the aperture of the single opening of the bias electrode is no greater than 0.3mm.

Optionally, the plurality of openings on the bias electrode are uniform in size, and the plurality of openings on the signal electrode are uniform in size, and the area of each opening on the bias electrode is smaller than the area of each opening on the signal electrode.

Alternatively, the bias electrode includes any one of a single metal electrode resistant to corrosion and ultraviolet damage, an alloy electrode, an electrode of an inorganic material other than an alloy, and a composite electrode composed of an organic and inorganic material.

Optionally, the first housing and the second housing are both plastic housings, and the signal electrode and the bias electrode are both sheet electrodes.

Optionally, a pin connector is provided on the bias electrode and/or the signal electrode.

Alternatively, the pin connector on the bias electrode and the pin connector on the signal electrode are located at the end of each electrode, respectively, and at the opposite ends of the signal detector.

The utility model also provides a gas sensor comprising an ultraviolet lamp and the signal detector in any scheme, wherein the ultraviolet lamp comprises a glass lamp tube and an ultraviolet light output window, the ultraviolet light output window is positioned at the end part of the glass lamp tube and seals the glass lamp tube, and one end of the ultraviolet lamp provided with the ultraviolet light output window is positioned in an opening of the first shell adjacent to the biasing electrode.

Optionally, the gas sensor comprises a PID sensor.

As described above, the signal detector and the gas sensor of the present utility model have the following advantageous effects: according to the method, through the improved structural design, the total area of the holes in the bias electrode is reduced as much as possible, the incident total amount of ultraviolet light entering the ionization chamber through the bias electrode can be controlled under the conditions of not increasing cost and changing process flow and on the premise of not affecting measurement, so that the ultraviolet light energy entering the signal detector can be greatly reduced, the etching speed of the insulating gasket is slowed down, the service life of the signal detector is prolonged, and meanwhile, the performance of the detector can be improved.

Drawings

Fig. 1 is a schematic diagram of an assembled structure of a signal detector according to the present utility model.

Fig. 2 is a schematic view showing an exploded structure of fig. 1.

Fig. 3 is a schematic diagram showing an assembled structure of a gas sensor according to the present utility model.

Fig. 4 is a schematic view showing an exploded structure of fig. 3.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. As described in detail in the embodiments of the present utility model, the cross-sectional view of the device structure is not partially enlarged to a general scale for convenience of explanation, and the schematic drawings are only examples, which should not limit the scope of the present utility model. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.

For ease of description, spatially relative terms such as "under", "below", "beneath", "above", "upper" and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that these spatially relative terms are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the figures. Furthermore, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers or one or more intervening layers may also be present.

In the context of this application, a structure described as a first feature being "on" a second feature may include embodiments where the first and second features are formed in direct contact, as well as embodiments where additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

It should be noted that, the illustrations provided in the present embodiment merely illustrate the basic concept of the present utility model by way of illustration, and only the components related to the present utility model are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complex. In order to make the illustration as concise as possible, not all structures are labeled in the drawings.

Please refer to fig. 1 to 4.

As shown in fig. 1 to 2, the present utility model provides a signal detector 2, which includes a first housing 21, a second housing 27, a bias electrode 22, an insulating spacer 23, and a signal electrode 24, wherein openings corresponding to each other are provided on the first housing 21 and the second housing 27, that is, an opening 211 is provided on the first housing 21, an opening 271 is provided on the second housing, one of the

openings

211 and 271 is used as an ultraviolet light irradiation hole, the other is used as an inlet for a detected gas to enter the signal detector, the first housing 21 and the second housing 27 may also be defined as an upper housing and a lower housing, the openings on the first housing 21 and the second housing 27 are preferably identical in shape and size, the bias electrode 22, the insulating spacer 23, and the signal electrode 24 are stacked one on top of the other, that is, the insulating spacer 23 is located between the bias electrode 22 and the signal electrode 24, in order to electrically isolate the two, the three are preferably sheet-shaped structures, namely, the bias electrode 22 and the signal electrode 24 are preferably sheet-shaped electrodes, the bias electrode 22 and the signal electrode 24 have relatively small thickness and are commonly positioned in a space formed by up-down sealing connection of the first shell 21 and the second shell 27, a plurality of openings are formed in the bias electrode 22, the insulating gasket 23 and the signal electrode 24, the openings 221 in the bias electrode 22 are mainly used for transmitting ultraviolet light, the openings 241 in the signal electrode 24 are mainly used for diffusing gas, the openings in the bias electrode 22, the signal electrode 24 and the openings 231 in the insulating gasket 23 are all preferably a plurality of, and in order to ensure measurement accuracy, the distance and the relative position between the bias electrode 22 and the signal electrode 24 need to be kept fixed; wherein the ratio of the sum of the areas of all the openings 221 on the bias electrode 22 to the illuminated area is preferably less than 10% (in case the housing opening and the ultraviolet light output window are completely identical in size, then the ratio can be regarded approximately as the ratio of the sum of the areas of all the openings 221 of the bias electrode 22 to the area of the ultraviolet light output window), and the ratio is preferably equal to or greater than 0.01%. The signal detector can be used for various gas sensors, plays a role in converting photo-ion charge into current, and whether the signal detector is stable or not is directly related to the performance of the gas sensor. When the signal detector is used for a gas sensor, ultraviolet rays from an ultraviolet output window of an ultraviolet lamp adjacent to the signal detector enter the ionization cavity after passing through an opening on the bias electrode, the detected gas entering the ionization cavity is ionized, ionized positive ions are collected by the signal electrode and converted into signal current, and the signal current is related to the gas concentration. Since the energy of the ultraviolet light from the ultraviolet lamp is very high, the insulating pad between the bias electrode and the signal electrode gradually decomposes and gasifies under the direct irradiation of the ultraviolet light (the maximum light receiving area of the bias electrode is generally determined by parameters such as the inner diameter of the glass lamp tube and the size of the corresponding opening of the detector shell and the lamp), and the physical structure of the signal detector is damaged, so that the performance of the signal detector is reduced. According to the method, through the improved structural design, the total area of the holes in the bias electrode is reduced as much as possible, the incident total amount of ultraviolet light entering the ionization chamber through the bias electrode can be controlled under the conditions of not increasing cost and changing process flow and not affecting measurement, so that the ultraviolet light energy entering the signal detector can be greatly reduced, the etching speed of the insulating gasket is slowed down, the service life of the signal detector is prolonged, and meanwhile, the performance of the detector can be improved.

The inventors have found through extensive experimentation that the aperture of the single opening 221 of the biasing electrode 22 is preferably no greater than 0.3mm, such as 0.1-0.2mm. The openings 221 on the bias electrode 22 may be formed by laser processing, etching processing, or machining a light-entering hole, and the shape, arrangement, and number of the openings 221 are not limited. And in a preferred example, for ease of processing, the plurality of openings in the bias electrode are preferably circular openings in size and preferably uniform in size.

Likewise, the openings 241 on the signal electrode 24 may be laser-processed holes, etched holes or machined holes, and the shape, arrangement and number of the holes are not limited, but are preferably circular holes, and the openings are preferably uniform in size, the openings 241 may be arranged in an array, and typically the total area of the openings on the bias electrode 22 is smaller than the total area of the openings on the signal electrode 24. In an example, each opening 221 on the bias electrode 22 corresponds to each opening 241 on the signal electrode 24 one above the other, but the area of each opening 221 on the bias electrode 22 is smaller than the area of each opening 241 on the signal electrode 24, and the opening 231 on the insulating spacer 23 is generally larger than the size of the opening 221 on the bias electrode 22 but not larger than the size of the opening 241 on the signal electrode 24, and the openings 231 on the insulating spacer 23 and the openings 221 on the bias electrode 22 may also correspond one above the other.

As an example, the bias electrode 22 is preferably any one of a single metal electrode resistant to corrosion and ultraviolet damage, an alloy electrode, an electrode of an inorganic material other than an alloy, and a composite electrode composed of an organic and inorganic material.

The first housing 21 and the second housing 27 are each insulating housings to electrically isolate the electrodes from external structures. Preferably, the first housing 21 and the second housing 27 are plastic housings that are shaped to provide the desired configuration, and the openings in the housing adjacent the bias electrode are required to ensure that the openings in the bias electrode are exposed.

To facilitate connection to external circuitry, in a preferred example, the bias electrode 22 and/or the signal electrode 24 are provided with solderable pin connectors, preferably on both electrodes, and the pin connector 25 on the bias electrode 22 and the pin connector 26 on the signal electrode 24 are preferably located at opposite ends of the signal detector, respectively. Referring to fig. 2, the extension position of the pin connector of each electrode corresponding to the other electrode may be configured as an arc-shaped notch.

The signal detector provided by the utility model is very convenient to assemble, and can be assembled from top to bottom or from bottom to top as shown in fig. 2, and the signal detector is not developed in detail.

The signal detector provided by the utility model can be used in various gas sensors, so as shown in fig. 3 and 4, the utility model also provides a gas sensor, which comprises an ultraviolet lamp 1 and the signal detector 2 in any scheme; the foregoing description of the signal detector 2 may be incorporated by reference herein in its entirety and will not be repeated for the sake of brevity; the ultraviolet lamp 1 includes a glass lamp tube 11 and an ultraviolet light output window 12, the ultraviolet light output window 12 is located at an end of the glass lamp tube 11 and seals the glass lamp tube 11, and one end of the ultraviolet lamp 1 provided with the ultraviolet light output window 12 is located in an opening of the first housing 21 adjacent to the bias electrode 22 (as shown in fig. 2, in this example, the first housing 21 is adjacent to the bias electrode 22 as compared to the second housing 27). The bias electrode 22 is spaced as little as possible from the uv light output window 12 but is not in direct contact with the uv light output window 12. The gas sensor includes, but is not limited to, a PID sensor. By adopting the signal detector, the long-term working stability, namely the service life, of the gas sensor provided by the utility model can be obviously prolonged, and the detection performance is also improved.

In summary, the present utility model provides a signal detector and a gas sensor. The signal detector comprises a first shell, a second shell, a bias electrode, an insulating gasket and a signal electrode, wherein openings corresponding to each other are formed in the first shell and the second shell, the bias electrode, the insulating gasket and the signal electrode are sequentially overlapped up and down and are commonly located in a space formed by sealing connection of the first shell and the second shell, a plurality of openings are formed in the bias electrode, the insulating gasket and the signal electrode, and the ratio of the sum of the areas of all the openings to the illuminated area on the bias electrode is smaller than 10%. According to the method, through the improved structural design, the total area of the holes in the bias electrode is reduced as much as possible, the incident total amount of ultraviolet light entering the ionization chamber through the bias electrode can be controlled under the conditions of not increasing the cost and changing the process flow and not affecting measurement, so that the ultraviolet light energy entering the signal detector can be greatly reduced, the etching speed of the insulating gasket is slowed down, the service life of the signal detector is prolonged, and meanwhile, the performance of the detector can be improved. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. The utility model provides a signal detector which characterized in that, includes first casing, second casing, biasing electrode, insulating gasket and signal electrode, be provided with the trompil that corresponds each other on first casing and the second casing, biasing electrode, insulating gasket and signal electrode overlap from top to bottom in proper order, and lie in the space that first casing and second casing sealing connection constitutes jointly, all be provided with a plurality of trompils on biasing electrode, insulating gasket and the signal electrode, wherein, the ratio of the sum of the area of all trompils on the biasing electrode to illuminated area is less than 10%.

2. The signal detector of claim 1, wherein the aperture of a single aperture of the bias electrode is no greater than 0.3mm, and the ratio of the sum of the areas of all apertures on the bias electrode to the illuminated area is greater than or equal to 0.01%.

3. The signal detector of claim 1, wherein the total area of the openings in the bias electrode is less than the total area of the openings in the signal electrode.

4. The signal detector of claim 1, wherein the plurality of openings in the bias electrode are uniform in size and the plurality of openings in the signal electrode are uniform in size, and wherein the area of each opening in the bias electrode is smaller than the area of each opening in the signal electrode.

5. The signal detector of claim 1, wherein the bias electrode comprises any one of a corrosion and ultraviolet damage resistant single metal electrode and an alloy electrode.

6. The signal detector of claim 1, wherein the first housing and the second housing are plastic housings and the signal electrode and the bias electrode are sheet electrodes.

7. Signal detector according to claim 1, characterized in that a pin connector is provided on the bias electrode and/or the signal electrode.

8. The signal detector of claim 7, the pin connectors on the bias electrode and the pin connectors on the signal electrode being located at opposite ends of the signal detector, respectively, at the ends of each electrode.

9. A gas sensor comprising an ultraviolet lamp and a signal detector as claimed in any one of claims 1 to 8, the ultraviolet lamp comprising a glass tube and an ultraviolet light output window located at an end of the glass tube and sealing the glass tube, the end of the ultraviolet lamp where the ultraviolet light output window is located being located within the aperture of the first housing adjacent the biasing electrode.

10. The gas sensor of claim 9, comprising a PID sensor.