CN206862941U - From early warning gas sensor - Google Patents
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- CN206862941U CN206862941U CN201720664122.XU CN201720664122U CN206862941U CN 206862941 U CN206862941 U CN 206862941U CN 201720664122 U CN201720664122 U CN 201720664122U CN 206862941 U CN206862941 U CN 206862941U
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- Emergency Alarm Devices (AREA)
Abstract
The utility model discloses one kind from early warning gas sensor, including：End cap, housing and multiple gas-sensing elements；Wherein, end cap is arranged at the top of housing, and gas outlet is offered on end cap；Housing includes side wall and bottom surface, air inlet being offered on the bottom surface of housing, and housing has hollow structure to form gas channel, and gas channel connects with air inlet and gas outlet, to cause air flow through air inlet into gas channel and be flowed out by gas outlet；Multiple gas-sensing elements are arranged in housing；When air-flow enters gas channel by air inlet, gas-sensing element is because of electric signal corresponding to airflow function generation.Using technical scheme provided by the utility model, it can easily know whether gas-sensing element is in abnormality according to electric signal caused by multiple gas-sensing elements.
Description
Technical Field
The utility model relates to a sensor technical field, concretely relates to from early warning gas sensor.
Background
With the continuous development of science and technology and the living needs of people, gas sensors are applied to multiple aspects in life. However, after the gas sensor is put into use, it is difficult for people to know which gas sensors are abnormal in operation in time, and further, the gas sensors cannot be repaired or replaced in time.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the defect of prior art, provide a self-warning gas sensor for solve among the prior art people hardly know in time that gas sensor work appears unusually.
The utility model provides a from early warning gas sensor, include: an end cap, a housing, and a plurality of gas sensing elements; wherein,
the end cover is arranged at the top of the shell and is provided with an air outlet;
the shell comprises a side wall and a bottom surface, an air inlet is formed in the bottom surface of the shell, the shell is of a hollow structure to form an air flow channel, and the air flow channel is communicated with the air inlet and the air outlet so that air flow enters the air flow channel through the air inlet and flows out through the air outlet;
the gas sensing elements are arranged in the shell; when airflow enters the airflow channel through the air inlet, the gas sensing element generates a corresponding electric signal due to the action of the airflow.
Further, a plurality of fixing parts for fixing the plurality of gas sensing elements within the housing are provided on a side wall of the housing.
Further, the fixing part is a strip-shaped protrusion; the strip-shaped protrusion is a protrusion formed on the inner surface of the side wall of the shell by the side wall of the shell sinking inwards; each gas sensing element is clamped between the two strip-shaped protrusions.
Further, the gas sensing element includes: the device comprises a base frame body, and a metal electrode layer, an annular gasket and a vibrating diaphragm which are embedded in the base frame body and are sequentially stacked; wherein,
one surface of the metal electrode layer, which is far away from the annular gasket, is close to the inner surface of the side wall of the shell; the metal electrode layer and the vibrating diaphragm are separated through an annular gasket to form a friction space;
part of the area of the diaphragm is exposed in the airflow channel through the base frame; under the action of airflow, the vibrating diaphragm and the metal electrode layer rub to generate a corresponding electric signal; the metal electrode layer is an electrical signal output end of the gas sensing element.
Further, a friction space formed between the metal electrode layer and the diaphragm is a closed space.
Further, the self-warning gas sensor further comprises: an alarm module;
the alarm module is arranged on the end cover and used for sending out an alarm signal when any gas sensing element is in an abnormal state.
Further, the alarm module is further configured to: and judging whether the difference value between the electric signals generated by at least two gas sensing elements in the plurality of gas sensing elements is larger than a first preset signal threshold value, and if so, sending an alarm signal.
Further, the alarm module is further configured to: and judging whether the electrical signal generated by at least one gas sensing element in the plurality of gas sensing elements is smaller than a second preset signal threshold value, if so, sending an alarm signal.
Furthermore, the end cover is also provided with a plurality of signal leading-out ends; the signal leading-out ends are respectively connected with the signal output ends of the gas sensing elements and used for leading out electric signals generated by the gas sensing elements.
Further, the material of the shell is a conductive material, and an insulating layer is further arranged on the inner surface of the side wall of the shell.
Furthermore, at least one of two opposite surfaces of the metal electrode layer and the diaphragm is provided with a protrusion array structure.
Further, the material of the diaphragm is selected from the group consisting of a polydimethylsiloxane film, a polyimide film, a polyvinylidene fluoride film, a aniline formaldehyde resin film, a polyoxymethylene film, an ethyl cellulose film, a polyamide film, a melamine formaldehyde film, a polyethylene glycol succinate film, a cellulose acetate film, a polyethylene adipate film, a polydiallyl phthalate film, a fibrous sponge film, a polyurethane elastomer film, a styrene-propylene copolymer film, a styrene-butadiene copolymer film, a rayon film, a polymethyl methacrylate film, a polyvinyl alcohol film, a polyester film, a polyisobutylene film, a polyurethane flexible sponge film, a polyethylene terephthalate film, a polyvinyl butyral film, a formaldehyde phenol film, a chloroprene rubber film, a butadiene-propylene copolymer film, a polyethylene terephthalate film, a polyvinyl butyral film, a chloroprene rubber film, a butadiene-propylene copolymer film, a polyethylene terephthalate, One of a natural rubber film, a polyacrylonitrile film, an acrylonitrile-vinyl chloride film and a polyethylene propylene glycol carbonate film.
According to the utility model provides a from early warning gas sensor, the inside airflow channel that forms of casing to set up a plurality of gaseous sensing elements in the casing, when the air current passes through air inlet entering airflow channel, gaseous sensing element produces the signal of telecommunication that corresponds because of the air current effect. The utility model discloses an above-mentioned field such as medical gas measurement can be applied to from early warning gas sensor, should not only have sensitivity and rate of accuracy height from early warning gas sensor, structure and preparation simple process, low cost, be fit for large-scale industrial production's advantage, and can conveniently learn whether gaseous sensing element is in abnormal state according to the produced signal of telecommunication of a plurality of gaseous sensing elements, obtained the technological effect from the early warning, so that the user in time maintains or changes it, help prolonging gas sensor's life. In addition, when the friction space of the gas sensing element is a closed space, the influence of the characteristics of the gas flow, humidity and the like on the generation of the electric signal can be avoided.
Drawings
Fig. 1a is a schematic view of an exploded structure of an embodiment of a self-warning gas sensor provided by the present invention;
fig. 1b is a schematic diagram of an assembled structure of an embodiment of the self-warning gas sensor according to the present invention;
fig. 1c is a schematic diagram of an assembled structure of an embodiment of the self-warning gas sensor according to the present invention;
fig. 1d is a schematic diagram illustrating the arrangement of the fixing member in the embodiment of the self-warning gas sensor provided by the present invention;
fig. 2a is a schematic exploded view of a gas sensing element in an embodiment of a self-warning gas sensor according to the present invention;
fig. 2b is a schematic diagram of an assembled structure of a gas sensing element in an embodiment of the self-warning gas sensor provided by the present invention;
fig. 2c is a schematic cross-sectional structure diagram of the assembled gas sensing element in the embodiment of the self-warning gas sensor according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and functions of the present invention, but the present invention is not limited thereto.
The utility model provides a from early warning gas sensor, this from early warning gas sensor includes: an end cap, a housing, and a plurality of gas sensing elements; the end cover is arranged at the top of the shell and is provided with an air outlet; the shell comprises a side wall and a bottom surface, an air inlet is formed in the bottom surface of the shell, the shell is of a hollow structure to form an air flow channel, and the air flow channel is communicated with the air inlet and the air outlet so that air flow enters the air flow channel through the air inlet and flows out through the air outlet; the gas sensing elements are arranged in the shell; when airflow enters the airflow channel through the air inlet, the gas sensing element generates a corresponding electric signal due to the action of the airflow. Utilize the utility model provides a from early warning gas sensor can conveniently learn whether gaseous sensing element is in abnormal state according to the produced signal of telecommunication of a plurality of gaseous sensing elements, has obtained the technological effect from the early warning.
Fig. 1a is the utility model provides a from decomposition structure schematic diagram of early warning gas sensor embodiment, fig. 1b and fig. 1c do respectively the utility model provides a from post-assembly structure schematic diagram of early warning gas sensor embodiment, as shown in fig. 1a, fig. 1b and fig. 1c, should include from early warning gas sensor: an end cap 110, a housing 120, and a plurality of gas sensing elements 130. In the present embodiment, a case that the self-warning gas sensor includes three gas sensing elements 130 is exemplarily shown, and a person skilled in the art may set the number of the gas sensing elements 130 according to actual needs, which is not limited herein.
The end cap 110 is disposed on the top of the housing 120, the end cap 110 is provided with an air outlet 111, and the end cap 110 is further provided with a plurality of signal terminals 112-114. The number of the air outlets 111 shown in the present embodiment is two, and the air outlets 111 are circular in shape, and the two air outlets 111 are distributed on two sides of the plurality of signal leading-out terminals 112 to 114. Alternatively, the end cap 110 may be a printed circuit board. The end cap 110 and the housing 120 may be connected by threads, glue, etc., and those skilled in the art can select the connection manner according to actual needs, which is not limited herein.
The housing 120 includes a side wall and a bottom surface, an air inlet 121 is opened on the bottom surface of the housing 120, the housing 120 has a hollow structure to form an air flow passage, and the air flow passage is communicated with the air inlet 121 and the air outlet 111, so that the air flow enters the air flow passage through the air inlet 121 and exits through the air outlet 111. The number of the air inlets 121 shown in the present embodiment is one, and the air inlets 121 are circular in shape, and are opened at the middle of the bottom surface of the housing 120. The number, shape and specific distribution of the air inlets 121 and the air outlets 111 can be set by those skilled in the art according to actual needs, and are not limited herein. Optionally, to facilitate the gas flow forming a vortex in the gas flow channel to enable better friction of the gas sensing element 130, the sum of the transverse cross-sectional areas of the gas inlets may be greater or less than the sum of the transverse cross-sectional areas of the gas outlets. In addition, the generation of the vortex is related to the flow velocity of the gas, the density of the gas and the structure of the gas flow channel, the faster the flow velocity of the gas, the greater the density of the gas, the more irregular the structure of the gas flow channel, and the stronger the effect of the generated vortex, therefore, in order to improve the sensitivity and output of the gas sensing element 130, a protrusion, a step or a corresponding structural design may be provided in the housing 120 to improve the effect of the generation of the vortex.
The three gas sensing elements 130 are uniformly disposed in the housing 120. When the airflow enters the airflow channel through the air inlet 121, the gas sensing element 130 is rubbed by the airflow and generates a corresponding electrical signal. A plurality of fixing parts for fixing the plurality of gas sensing elements 130 within the housing 120 are provided on a sidewall of the housing 120. The fixing member can be set by those skilled in the art according to actual needs, and the form of the fixing member is not particularly limited herein.
In the present embodiment, the fixing component is a bar-shaped protrusion 122, as shown in fig. 1d, the bar-shaped protrusion 122 is a protrusion formed on the inner surface of the sidewall of the housing 120 by recessing the sidewall of the housing 120 inward, and each gas sensing element 130 is clamped between two bar-shaped protrusions 122. Specifically, the sidewall of the housing 120 corresponding to the location where the strip-shaped protrusion is disposed may be recessed inward, so as to form a protrusion, i.e., the strip-shaped protrusion 122, on the inner surface of the sidewall of the housing 120, as shown in fig. 1d, three strip-shaped protrusions 122 are disposed on the sidewall of the housing 120, and each gas sensing element 130 is clamped between two strip-shaped protrusions 122, so as to uniformly dispose the three gas sensing elements 130 in the housing 120. In addition, when the length of the gas sensing element 130 is equal to the distance from the bottom surface of the housing 120 to the end cap 110, the gas sensing element 130 may be longitudinally limited by the bottom surface of the housing 120 and the end cap 110; when the length of the gas sensing element 130 is less than the distance from the bottom surface of the housing 120 to the end cap 110, a person skilled in the art may arrange a corresponding structure in the housing 120 according to the prior art to longitudinally limit the gas sensing element 130 so as to fix it in place, for example, an inwardly recessed protruding point may be arranged on the surface of the strip-shaped protrusion 122, and a gasket with a certain thickness may be arranged at an end close to the end cap 110 or the thickness of the end cap may be increased so as to cooperate with the protruding point to longitudinally limit the gas sensing element 130.
When the material of the housing 120 is an insulating material, an insulating layer is not required to be provided on the inner surface of the sidewall of the housing 120; when the material of the housing 120 is a conductive material, an insulating layer is further disposed on the inner surface of the sidewall of the housing 120, and specifically, the insulating layer may be disposed by spraying an insulating adhesive or attaching an insulating film, which is not limited herein.
As shown in fig. 1a, 1b and 1c, a plurality of signal terminals 112-114 disposed on the end cap 110 are respectively connected to the signal output terminals of the plurality of gas sensing elements 130, for outputting the electrical signals generated by the plurality of gas sensing elements 130. The electrical signals generated by the plurality of gas sensing elements 130 are independent of each other. Under normal operation, the values of the electrical signals generated by the plurality of gas sensing elements 130 due to the friction of the gas flow are substantially the same, but slightly different, and optionally one of the values of the electrical signals is used as a standard measurement value, and then it can be determined whether the gas flow passes through the standard measurement value, and further, information such as the flow rate and the flow velocity of the gas flow can be calculated according to the standard measurement value. It should be noted that the value of the electrical signal generated by the friction of the gas sensing element under normal operation conditions corresponds to the flow rate of the gas flow. The corresponding relation between the value of the electric signal generated by the gas sensing element due to the friction of the gas flow and the flow rate and the flow speed of the gas flow can be preset by a manufacturer of the self-warning gas sensor.
In the present embodiment, the end cap 110 is provided with three signal terminals 112, 113, and 114 and a ground terminal 115. The three signal leading-out terminals 112, 113, and 114 are respectively connected to the signal output terminals of the three gas sensing elements 130, and are used for leading out the electrical signals generated by the three gas sensing elements 130. For example, the electrical signal generated by the first gas sensing element 130 due to friction is the voltage electrical signal V1, the electrical signal generated by the second gas sensing element 130 due to friction is the voltage electrical signal V2, and the electrical signal generated by the third gas sensing element 130 due to friction is the voltage electrical signal V3. The three voltage electrical signals are independent of each other. The voltage electrical signal V1 is led out from the signal lead-out terminal 112, the voltage electrical signal V2 is led out from the signal lead-out terminal 113, and the voltage electrical signal V3 is led out from the signal lead-out terminal 114.
Utilize the utility model provides a from early warning gas sensor, whether gaseous sensing element 130 is in abnormal state can conveniently be known according to the produced signal of telecommunication of a plurality of gaseous sensing element 130, specifically, if the numerical value of the produced signal of telecommunication of a certain gaseous sensing element 130 is less than the numerical value of the produced signal of telecommunication of other gaseous sensing element 130 or the numerical value of the signal of telecommunication to a certain extent and is zero, shows that this gaseous sensing element 130 is in abnormal state. In addition, when one of the gas sensing elements 130 is in an abnormal state, the self-warning gas sensor can still be used, specifically, a value of an electrical signal generated by any one of the other gas sensing elements 130 in the self-warning gas sensor can be selected as a standard measurement value, and then whether an air flow passes through the self-warning gas sensor can be judged according to the standard measurement value, and further, information such as a flow rate and a flow velocity of the air flow can be calculated according to the standard measurement value.
Optionally, the self-alert gas sensor further comprises: an alarm module (not shown in the drawings), which may be disposed on the end cap 110, is configured to send an alarm signal when the electrical signal generated by any one of the gas sensing elements 130 is in an abnormal state, for example, when a value of the electrical signal generated by one of the gas sensing elements 130 is smaller than values of the electrical signals generated by other gas sensing elements 130 to a certain extent or a value of the electrical signal generated by one of the gas sensing elements 130 is zero, so as to help a user to timely know and maintain or replace the gas sensing element. The specific form of the alarm signal can be set by those skilled in the art according to actual needs, and is not limited herein. The warning signal may be in the form of a sound and/or light, for example.
Specifically, the alarm module is configured to: whether the difference value between the electric signals generated by at least two gas sensing elements 130 in the plurality of gas sensing elements 130 is larger than a first preset signal threshold value is judged, and if yes, an alarm signal is sent out. The first preset signal threshold can be set by a person skilled in the art according to actual needs, and is not limited herein.
Since the values of the electrical signals generated by the plurality of gas sensing elements 130 due to the friction of the gas flow under normal operating conditions are substantially the same, they differ slightly. Assuming that the number of the gas sensing elements 130 is 3, if the alarm module determines that the difference between the electrical signal generated by the first gas sensing element and the electrical signal generated by the second gas sensing element is greater than the first preset signal threshold, the difference between the electrical signal generated by the first gas sensing element and the electrical signal generated by the third gas sensing element is also greater than the first preset signal threshold, and the difference between the electrical signal generated by the second gas sensing element and the electrical signal generated by the third gas sensing element is less than or equal to the first preset signal threshold, it can be said that the first gas sensing element is in an abnormal state, the second gas sensing element and the third gas sensing element are in a normal working state, the alarm module sends out an alarm signal to help the user to know in time and maintain or replace the first gas sensing element.
Optionally, the alarm module is further configured to: and judging whether the electrical signal generated by at least one gas sensing element in the plurality of gas sensing elements is smaller than a second preset signal threshold value, if so, sending an alarm signal. The second preset signal threshold can be set by those skilled in the art according to actual needs, and is not limited herein.
If the alarm module determines that the electrical signal generated by the first gas sensing element in the plurality of gas sensing elements is smaller than the second preset signal threshold value and the electrical signals generated by the other gas sensing elements are greater than or equal to the second preset signal threshold value, it can be said that the first gas sensing element is in an abnormal state, and the second gas sensing element and the third gas sensing element are in a normal working state, the alarm module sends out an alarm signal, which is helpful for a user to timely know and maintain or replace the first gas sensing element.
Fig. 2a, fig. 2b and fig. 2c are respectively an exploded schematic structure diagram, an assembled schematic structure diagram and an assembled schematic cross-sectional structure diagram of the gas sensing element in the embodiment of the self-warning gas sensor provided by the present invention, as shown in fig. 2a, fig. 2b and fig. 2c, the gas sensing element 130 includes: a base frame 131, and a metal electrode layer 132, an annular spacer 133, and a diaphragm 134 which are embedded in the base frame 131 and are stacked in this order. The inside of the chassis frame 131 has a certain depth, and the metal electrode layer 132, the annular spacer 133, and the diaphragm 134 can be embedded in the chassis frame 131. The base frame 131 and the diaphragm 134, the diaphragm 134 and the annular gasket 133, and the annular gasket 133 and the metal electrode layer 132 are fixed by adhesive, and have a sealing effect. Alternatively, a pressing plate may be provided on a surface of the metal electrode layer 132 remote from the diaphragm, the pressing plate may be connected to the chassis frame 131, and the metal electrode layer 132, the annular gasket 133, and the diaphragm 134 may be fixed in the chassis frame 131 to seal the gap. The side of the metal electrode layer 132 away from the annular spacer 133 is close to the inner surface of the side wall of the housing, and the metal electrode layer 132 and the diaphragm 134 are separated by the annular spacer 133 to form a friction space 135. Preferably, the friction space 135 formed between the metal electrode layer 132 and the diaphragm 134 is a closed space, which helps to prevent the characteristics of the air flow itself or humidity from affecting the generation of the electrical signal.
Fig. 2c shows a schematic cross-sectional structure of the gas sensing element in the direction B-B', and as shown in fig. 2c, a middle region of the base frame 131 is hollowed out, so that a partial region of the diaphragm 134 is exposed to the gas flow channel through the base frame 131. Under the action of the airflow, the diaphragm 134 rubs against the metal electrode layer 132 and generates a corresponding electrical signal. The metal electrode layer 132 is an electrical signal output terminal of the gas sensing element 130. Specifically, when the airflow enters the airflow channel through the air inlet, a vortex is generated to act on the diaphragm 134, so that the diaphragm 134 is driven by the airflow to vibrate, and the diaphragm 134 is in contact with the metal electrode layer 132 to rub, thereby generating electric charges. The change of the air flow velocity will make the vibration of the diaphragm 134 change, so that the amount of charge generated by the contact friction between the diaphragm 134 and the metal electrode layer 132 changes, and finally the voltage and the frequency of the output electrical signal change.
Wherein, the material of the metal electrode layer 132 may be selected from gold, silver, platinum, palladium, aluminum, nickel, copper, titanium, chromium, tin, iron, manganese, molybdenum, tungsten or vanadium; the alloy is one of an aluminum alloy, a titanium alloy, a magnesium alloy, a beryllium alloy, a copper alloy, a zinc alloy, a manganese alloy, a nickel alloy, a lead alloy, a tin alloy, a cadmium alloy, a bismuth alloy, an indium alloy, a gallium alloy, a tungsten alloy, a molybdenum alloy, a niobium alloy, and a tantalum alloy. The material of the diaphragm 134 may be selected from the group consisting of a polydimethylsiloxane film, a polyimide film, a polyvinylidene fluoride film, a aniline formaldehyde resin film, a polyoxymethylene film, an ethyl cellulose film, a polyamide film, a melamine formaldehyde film, a polyethylene glycol succinate film, a cellulose acetate film, a polyethylene adipate film, a polydiallyl phthalate film, a fiber sponge film, a polyurethane elastomer film, a styrene-propylene copolymer film, a styrene-butadiene copolymer film, a rayon film, a polymethyl methacrylate film, a polyvinyl alcohol film, a polyester film, a polyisobutylene film, a polyurethane flexible sponge film, a polyethylene terephthalate film, a polyvinyl butyral film, a formaldehyde phenol film, a chloroprene rubber film, a butadiene-propylene copolymer film, a poly (vinylidene fluoride) film, a poly (vinyl acetate) film, a poly (ethylene adipate) film, a polydiallyl phthalate film, a fiber sponge film, a polyurethane flexible sponge film, one of a natural rubber film, a polyacrylonitrile film, an acrylonitrile-vinyl chloride film and a polyethylene propylene glycol carbonate film. Preferably, the material of the metal electrode layer 132 and the material of the diaphragm 134 should have a large polarity difference so as to obtain a good friction power generation effect, for example, the material of the metal electrode layer 132 may be selected to be copper, and the material of the diaphragm 134 may be selected to be a high polarity material such as a polydimethylsiloxane film or a polyvinylidene fluoride film. The material of the diaphragm 134 is selected to have good compressibility to facilitate deformation vibration.
In addition, the thickness of the diaphragm 134 is an important factor affecting the sensitivity of the gas sensing element, and the thinner the thickness of the diaphragm 134, the better the sensitivity. Preferably, the thickness of the diaphragm 134 should be less than 50 μm.
In order to enable the metal electrode layer 132 and the diaphragm 134 in the gas sensing element to be in contact with each other and rub better, and increase the friction power generation effect, at least one of two opposite surfaces of the metal electrode layer 132 and the diaphragm 134 may be provided with a protrusion array structure. The utility model discloses do not limit to sunken and bellied kind, the quantity that contains in the protruding array structure, the sunken and bellied kind and quantity that contain in the protruding array structure can be set up in a flexible way to the technical staff in the field. For example: the convex array structure is formed by arranging a plurality of convex points according to a rectangle or a rhombus, or a plurality of strip-shaped structures are arranged on two sides, four corners, the peripheral edge or the whole surface of at least one surface according to a geometric arrangement. Wherein, the salient point can be in a cylindrical shape, a quadrangular prism shape or a quadrangular pyramid shape; the strip-shaped structures may be arranged in an array of cross, zebra, cross or square shapes.
According to the utility model provides a from early warning gas sensor, the inside airflow channel that forms of casing to set up a plurality of gaseous sensing elements in the casing, when the air current passes through air inlet entering airflow channel, gaseous sensing element produces the signal of telecommunication that corresponds because of the air current effect. The utility model discloses an above-mentioned field such as medical gas measurement can be applied to from early warning gas sensor, for example to the medical gas's among the aerosol treatment measurement, this from early warning gas sensor not only has sensitivity and rate of accuracy height, structure and preparation simple process, low cost, be fit for large-scale industrial production's advantage, and can conveniently learn whether gaseous sensing element is in abnormal state according to the produced signal of telecommunication of a plurality of gaseous sensing elements, the technological effect from the early warning has been obtained, so that the user in time maintains or changes it, help prolonging gas sensor's life. In addition, when the friction space of the gas sensing element is a closed space, the influence of the characteristics of the gas flow or humidity on the generation of the electric signal can be avoided.
The alarm module mentioned in the utility model is a circuit realized by hardware, for example, the alarm module may include a comparator, a speaker and/or an LED lamp, etc. Although the alarm module may be integrated with software, the present invention is intended to protect hardware circuits that integrate corresponding functions of software, not just software itself.
Finally, it is noted that: the above list is only the concrete implementation example of the present invention, and of course those skilled in the art can make modifications and variations to the present invention, and if these modifications and variations fall within the scope of the claims of the present invention and their equivalent technology, they should be considered as the protection scope of the present invention.
Claims (12)
1. A self-warning gas sensor, comprising: an end cap, a housing, and a plurality of gas sensing elements; wherein,
the end cover is arranged at the top of the shell and is provided with an air outlet;
the shell comprises a side wall and a bottom surface, an air inlet is formed in the bottom surface of the shell, the shell is provided with a hollow structure to form an air flow channel, and the air flow channel is communicated with the air inlet and the air outlet so that air flow enters the air flow channel through the air inlet and flows out through the air outlet;
the plurality of gas sensing elements are arranged in the shell; when airflow enters the airflow channel through the air inlet, the gas sensing element generates a corresponding electric signal due to the action of the airflow.
2. The self-warning gas sensor of claim 1, wherein a plurality of securing features are provided on a side wall of the housing for securing the plurality of gas sensing elements within the housing.
3. The self-warning gas sensor of claim 2, wherein the fixing member is a bar-shaped protrusion; the strip-shaped protrusion is a protrusion which is formed on the inner surface of the side wall of the shell by the side wall of the shell sinking inwards; each gas sensing element is clamped between the two strip-shaped protrusions.
4. The self-warning gas sensor of claim 1, wherein the gas sensing element comprises: the device comprises a base frame body, and a metal electrode layer, an annular gasket and a vibrating diaphragm which are embedded into the base frame body and are sequentially stacked; wherein,
one surface of the metal electrode layer, which is far away from the annular gasket, is close to the inner surface of the side wall of the shell; the metal electrode layer and the diaphragm are separated through the annular gasket to form a friction space;
a partial region of the diaphragm is exposed to the airflow channel through the chassis frame; under the action of airflow, the vibrating diaphragm and the metal electrode layer rub to generate a corresponding electric signal; the metal electrode layer is an electrical signal output end of the gas sensing element.
5. The self-warning gas sensor according to claim 4, wherein a friction space formed between the metal electrode layer and the diaphragm is a closed space.
6. The self-alarming gas sensor of claim 1, further comprising: an alarm module;
the alarm module is arranged on the end cover and used for sending out an alarm signal when any gas sensing element is in an abnormal state.
7. The self-warning gas sensor of claim 6, wherein the alarm module is further to: and judging whether the difference value between the electric signals generated by at least two gas sensing elements in the plurality of gas sensing elements is larger than a first preset signal threshold value, and if so, sending an alarm signal.
8. The self-warning gas sensor of claim 6, wherein the alarm module is further to: and judging whether the electrical signal generated by at least one gas sensing element in the plurality of gas sensing elements is smaller than a second preset signal threshold value, if so, sending an alarm signal.
9. The self-warning gas sensor of claim 4, wherein the end cap further comprises a plurality of signal terminals; the signal leading-out ends are respectively connected with the signal output ends of the gas sensing elements and used for leading out electric signals generated by the gas sensing elements.
10. The self-alarming gas sensor as claimed in any one of claims 1 to 9, wherein the housing is made of a conductive material, and an insulating layer is further provided on an inner surface of a sidewall of the housing.
11. The self-warning gas sensor of claim 4, wherein at least one of the two opposing surfaces of the metal electrode layer and the diaphragm is provided with a protrusion array structure.
12. The self-warning gas sensor according to claim 4 or 11, wherein the diaphragm is made of a material selected from the group consisting of a polydimethylsiloxane film, a polyimide film, a polyvinylidene fluoride film, a aniline formaldehyde resin film, a polyoxymethylene film, an ethyl cellulose film, a polyamide film, a melamine formaldehyde film, a polyethylene glycol succinate film, a cellulose acetate film, a polyethylene adipate film, a polydiallyl phthalate film, a fiber sponge film, a polyurethane elastomer film, a styrene-propylene copolymer film, a styrene-butadiene copolymer film, a rayon film, a polymethyl film, a methacrylate film, a polyvinyl alcohol film, a polyester film, a polyisobutylene film, a polyurethane flexible sponge film, a polyethylene terephthalate film, a polyvinyl butyral film, a polyethylene terephthalate film, a polyvinyl butyral film, a polyester film, a polyvinyl butyral film, a polyvinyl acetate film, a polyethylene terephthalate film, a, One of a formaldehyde phenol film, a chloroprene rubber film, a butadiene-propylene copolymer film, a natural rubber film, a polyacrylonitrile film, an acrylonitrile-vinyl chloride film and a polyethylene propylene carbonate film.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107525826A (en) * | 2017-06-08 | 2017-12-29 | 纳智源科技（唐山）有限责任公司 | From early warning gas sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525826A (en) * | 2017-06-08 | 2017-12-29 | 纳智源科技（唐山）有限责任公司 | From early warning gas sensor |
| CN107525826B (en) * | 2017-06-08 | 2024-09-06 | 纳智源科技（唐山）有限责任公司 | Self-early warning gas sensor |
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