KR20220090225A - Gas leakage prevention sensor and its manufacturing method - Google Patents

Abstract

a housing having an inner space; a gas filter installed in the housing to pass the target gas into the inner space of the housing; A sensing space is formed between the gas filter and the gas filter by being spaced apart from the upper side of the gas filter, and a gas sensing unit for detecting gas introduced into the sensing space is provided, and the gas detected by the gas sensing unit is converted into an electrical signal. circuit board; and a first elastic member positioned between the circuit board and the gas filter to seal the side surface of the sensing space, and to provide a fixing force to the gas filter by being pressed toward the gas filter when the circuit board is coupled.

Description

Gas leak detection sensor and manufacturing method thereof

The present invention relates to a gas leak detection sensor, and more particularly, to a technology for detecting that a target gas has leaked through a gas filter that allows the target gas to pass therethrough.

In general, hydrogen gas is used in various fields from semiconductor thin film processing to automobile fuel cells, rocket fuels in the aerospace industry, as well as hydrogen engines, and the range of its use is gradually expanding due to technological development.

Hydrogen gas has a high risk of explosion due to leakage when used due to its combustible properties.

Therefore, in the technology of using hydrogen gas, a technology for detecting hydrogen leakage is essential in order to prevent an accident due to the leakage of hydrogen gas.

On the other hand, the hydrogen gas leakage sensor includes a hydrogen detection unit that detects leakage of hydrogen gas using various hydrogen gas detection methods, such as a catalytic combustion type using a catalyst, a semiconductor type using a semiconductor oxide, and an electrolyte sensor using an electrolyte that reacts to hydrogen. contains

The conventional hydrogen gas leak sensor has a structure in which the hydrogen sensing unit is mounted in a sensor mounting unit protruding from the upper part of the casing, the hydrogen sensing unit is connected to a printed circuit board mounted inside the casing, and the printed circuit board is connected to a connector through an electric wire have

The conventional hydrogen gas leak sensor has a problem in that, since the detecting element is a bead type, the space occupied by the hydrogen detecting unit inside the case is wide and thus the space volume is widened, thereby slowing the reaction rate of the hydrogen gas leak. In addition, the conventional hydrogen gas leak sensor has a complicated assembly process by soldering the power and signal wires to the wires, and there is a fear that malfunctions may occur due to poor contact points.

The matters described as the background art above are only for improving the understanding of the background of the present invention, and should not be accepted as acknowledging that they correspond to the prior art already known to those of ordinary skill in the art.

KR 10-2011-0053560 A

The present invention has been proposed to solve this problem, and the target gas is transmitted through a gas filter mounted on the lower surface of the housing, and the inner wall of the filter holder located above the gas filter forms a sensing space through which the target gas is introduced, The purpose of this is to reduce the detection response time of the target gas present in the sensing space by assembling a circuit board with a gas sensing unit on the upper side of the filter holder and sealing the space between the circuit board and the gas filter with an elastic body.

A gas leak detection sensor according to the present invention includes a housing having an inner space; a gas filter installed in the housing to pass the target gas into the inner space of the housing; A sensing space is formed between the gas filter and the gas filter by being spaced apart from the upper side of the gas filter, and a gas sensing unit for detecting gas introduced into the sensing space is provided, and the gas detected by the gas sensing unit is converted into an electrical signal. circuit board; and a first elastic member positioned between the circuit board and the gas filter to seal the side surface of the sensing space, and pressurized toward the gas filter when the circuit board is coupled to provide a fixing force to the gas filter.

A bottom surface is formed in the lower portion of the inner space of the housing, an inlet hole formed to allow gas to flow therein is formed in the bottom surface, and the gas filter may be coupled to an upper side of the inlet hole in the inner space of the housing.

The housing includes a protrusion protruding upward to surround the outside of the inlet hole on the bottom surface, and the gas filter and the first elastic body may be inserted into the protrusion protrusion and laterally supported by the protrusion protrusion.

A filter holder positioned above the gas filter to press and fix the gas filter and form a sensing space for gas passing through the gas filter; an elastic body insertion groove is formed at the upper end of the filter holder, and the first elastic body is an elastic body It can be fixed by being inserted into the insertion groove.

An inlet hole formed to allow gas to flow into the housing is formed on the bottom surface of the housing, the diameter of the inlet hole is the same as the inner diameter of the filter holder, and the inner surface of the filter holder may constitute a side wall of the sensing space.

The first elastic body has a height greater than the depth of the elastic body insertion groove, and when the circuit board is coupled to the housing, the lower surface is supported by contacting the upper end of the filter holder. is lower than before assembly and can pressurize the filter holder.

The housing includes a protruding jaw extending upward from the bottom surface, and the gas filter and the filter holder may be inserted into the protruding jaw to be laterally supported by the protruding jaw.

A second elastic body positioned between the gas filter and the lower portion of the filter holder, and pressing the gas filter downward when the filter holder is coupled to the gas filter; may further include.

The inner space of the housing has an open upper end, and a filter, a filter holder, a first elastic body, and a circuit board may be assembled in this order through the open upper end.

It may further include; a sensor cover that covers the upper end of the open housing inner space and protects the circuit board from the outside.

A method of manufacturing a gas leak detection sensor according to the present invention comprises the steps of: fusing a gas filter to an upper side of an inlet hole formed at the bottom of an inner space of a housing and into which gas is injected; Assembling a first elastic body to the upper side of the gas filter; and applying a fixing force to the gas filter by deforming the first elastic body by assembling the circuit board by pressing the circuit board from the upper side to the lower side of the first elastic body.

A method of manufacturing a gas leak detection sensor according to the present invention comprises the steps of: fusing a gas filter to an upper side of an inlet hole formed at the bottom of an inner space of a housing and into which gas is injected; Assembling the filter holder to the upper side of the gas filter; inserting the first elastic body into the elastic body insertion groove formed in the filter holder to the upper side of the filter holder; and applying a fixing force to the gas filter by deforming the first elastic body by assembling the circuit board from the upper side of the filter holder to the lower side.

It may further include; assembling the second elastic body to the upper side of the gas filter before the step of assembling the filter holder to the upper side of the gas filter.

The gas leak detection sensor according to an embodiment of the present invention has an effect of preventing gas from leaking inside the housing by sealing the first elastic body between the gas filter and the circuit board.

In addition, since the inner side of the first elastic body forms a sensing space, it is possible to reduce the sensing response time for sensing the target gas by the gas sensing unit of the circuit board.

In the gas leak detection sensor according to another embodiment of the present invention, a filter holder for fixing the gas filter is positioned above the gas filter to fix the gas filter, and a first elastic body is disposed between the circuit board and the gas filter assembled to the upper side of the gas filter. is compressed and sealed to prevent gas from leaking inside the housing.

In addition, since the inner wall of the filter holder forms a sensing space, it is possible to shorten the sensing response time in the gas sensing unit located above the filter holder.

In addition, a second elastic body identical to the first elastic body is additionally deformed and inserted between the filter holder and the gas filter to seal between the filter holder and the gas filter, thereby preventing gas in the sensing space from leaking.

1 is a perspective view of a gas leak detection sensor according to an embodiment of the present invention;
Figure 2 is a cross-sectional view AA of Figure 1,
Figure 3 is an enlarged front view of Figure 2;
4 is a cross-sectional view showing another embodiment of the gas leak detection sensor according to the present invention;
5 is a cross-sectional view showing another embodiment of the gas leak detection sensor according to the present invention;
6 to 8 are flowcharts of manufacturing methods for various embodiments of the gas leak detection sensor according to the present invention.

Specific structural or functional descriptions of the embodiments of the present invention disclosed in the present specification or application are only exemplified for the purpose of describing the embodiments according to the present invention, and the embodiments according to the present invention are implemented in various forms. and should not be construed as being limited to the embodiments described in the present specification or application.

Since the embodiment according to the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the present specification or application. However, this is not intended to limit the embodiment according to the concept of the present invention to a specific disclosed form, and should be understood to include all changes, equivalents, or substitutes included in the spirit and scope of the present invention.

Terms such as first and/or second may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one element from another element, for example, without departing from the scope of the present invention, a first element may be called a second element, and similarly The second component may also be referred to as the first component.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle. Other expressions describing the relationship between elements, such as "between" and "immediately between" or "neighboring to" and "directly adjacent to", etc., should be interpreted similarly.

The terms used herein are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate the existence of an embodied feature, number, step, operation, component, part, or combination thereof, but one or more other features or numbers , it should be understood that it does not preclude the existence or addition of steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with the context of the related art, and unless explicitly defined in the present specification, they are not to be interpreted in an ideal or excessively formal meaning. .

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in each figure indicate like elements.

1 is a perspective view of a gas leakage detection sensor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1, FIG. 3 is an enlarged front view of FIG. 2, and FIG. 4 is a gas leakage detection sensor according to the present invention A cross-sectional view showing another embodiment, Figure 5 is a cross-sectional view showing another embodiment of the gas leak detection sensor according to the present invention.

A preferred embodiment of the gas leak detection sensor according to the present invention will be described with reference to FIGS. 1 to 5 .

The gas leak detection sensor according to the present invention was developed for the purpose of detecting hydrogen gas leakage by being mounted on a hydrogen battery vehicle, and the filter and the gas detection unit 410 are changed and mounted to detect a gas other than hydrogen gas can be

A gas leak detection sensor according to the present invention includes a housing 100 having an internal space; a gas filter 200 installed in the housing 100 to pass the target gas into the inner space of the housing 100; A sensing space 130 is formed between the gas filter 200 and the gas filter 200 by being spaced apart from the upper side of the gas filter 200, and a gas sensing unit 410 for detecting the gas introduced into the sensing space 130 is provided. , a circuit board 400 for converting the gas sensed by the gas detection unit 410 into an electrical signal; And it is positioned between the circuit board 400 and the gas filter 200 to seal the side surface of the sensing space 130 , and is pressed toward the gas filter 200 when the circuit board 400 is coupled to the gas filter 200 . It includes; a first elastic body 500 that provides a fixing force.

As in the embodiment shown in FIG. 4 , the housing 100 has an internal space, and a gas filter 200 through which a target gas located outside the housing 100 can permeate is positioned on the bottom surface of the internal space, and the gas filter A first elastic body 500 capable of fixing the gas filter 200 is positioned above the 200 . The target gas of the gas filter 200 may be various gases, and in the present invention, hydrogen gas may be the target.

The circuit board 400 is assembled to the housing 100 toward the upper side of the first elastic body 500 , and the gas transmitted from the gas filter 200 flows into the sensing space 130 inside the housing 100 and enters the sensing space 130 . ), gas may be detected through the gas sensing unit 410 mounted on the circuit board 400 .

The circuit board 400 may be assembled to the housing 100 by pressing the first elastic body 500 downward, and the first elastic body 500 is formed in a shape that can surround the sensing space 130 , and is sensed. There is an effect that the space 130 can be sealed, and also the filter holder 300 can be fixed by pressing the first elastic body 500, which is the circuit board 400, downward.

When the gas detection unit 410 detects gas, the circuit board 400 may convert it into an electrical signal and transmit it to the outside.

A connector capable of being connected to the outside may be formed in the housing 100 , and the circuit board 400 may be connected to the connector and transmit a gas detection fact to the outside through the connector.

A bottom surface is formed in the lower portion of the inner space of the housing 100 , and an inlet hole 110 formed to allow gas to flow into the bottom surface is formed, and the gas filter 200 is an inlet hole in the inner space of the housing 100 . It may be coupled to the upper side of 110 .

An inlet hole 110 through which gas flows into the inner space of the housing 100 is formed on the bottom surface of the inner space formed in the housing 100 , and the gas filter 200 may be coupled to the upper side of the inlet hole 110 . .

Through this, the gas flowing into the inlet hole 110 is filtered through the gas filter 200 so that the target gas flows into the sensing space 130 formed in the inner space of the housing 100, and gases other than the target gas are removed from the housing ( 100) to stay in the external space.

The housing 100 includes a protruding jaw 120 extending upward to surround the outside of the inlet hole 110 on the bottom surface, and the gas filter 200 and the first elastic body 500 are formed of the protruding jaw 120 . It may be inserted inside and supported by the protruding jaw 120 laterally.

The protrusion 120 extends upward from the bottom surface of the inner space of the housing 100 , is located outside the inlet hole 110 , and is an outer surface of the gas filter 200 positioned above the inlet hole 110 . This may be fixed, and the outer surface of the first elastic body 500 positioned above the gas filter 200 may be fixed.

Through this, the circuit board 400 is assembled to the upper side of the first elastic body 500 and the first elastic body 500 and the gas filter 200 are prevented from moving laterally when the first elastic body 500 is pressed. there is

A filter holder 300 positioned above the gas filter 200 to press and fix the gas filter 200 and form a sensing space 130 of the gas passing through the gas filter 200; further includes, a filter An elastic body insertion groove 310 is formed at the upper end of the holder 300 , and the first elastic body 500 may be inserted and fixed in the elastic body insertion groove 310 .

2 to 3, as one of the embodiments of the present invention, a filter holder 300 for fixing the gas filter 200 to the upper side of the gas filter 200 is assembled, and to the upper side of the filter holder 300. The first elastic body 500 is positioned, the circuit board 400 is assembled on the upper side of the first elastic body 500 to press the first elastic body 500 downward, and the gas filter 200 through the filter holder 300 . ) can be pressurized.

In addition, an inlet hole 110 formed to allow gas to flow therein is formed on the bottom surface of the housing 100 , and the diameter of the inlet hole 110 is the same as the inner diameter of the filter holder 300 , and the filter holder 300 . The inner surface of may constitute a side wall of the sensing space 130 .

The filter holder 300 may be formed in a cylindrical shape with a space formed therein, and the inner wall of the filter holder 300 forms the sensing space 130 , and the first elastic body 500 seals the sensing space 130 . There is an effect of improving the sensing response speed of the gas sensing unit 410 of the circuit board 400 .

In addition, since the diameter of the inlet hole 110 and the inner diameter of the filter holder 300 are formed to be the same, the gas transmitted through the gas filter 200 flows into the sensing space 130 formed by being surrounded by the inner surface of the filter holder 300 . can be

Through this, there is an effect that the detection response time of the gas detection unit 410 can be shortened.

The first elastic body 500 is formed to have a height greater than the depth of the elastic body insertion groove 310, and when the circuit board 400 is coupled to the housing 100, the lower surface is in contact with the upper end of the filter holder 300 and is supported. The first elastic body 500 is deformed inside the elastic body insertion groove 310 so that the height after assembly is lower than before assembly, and the filter holder 300 can be pressed.

The circuit board 400 may be assembled by pressing the first elastic body 500 downward from the upper side of the first elastic body 500 .

In this case, the first elastic body 500 may be compressed by being deformed in volume downward according to the pressure of the circuit board 400 . Through this, the first elastic body 500 seals between the filter holder 300 and the circuit board 400 at the same time as pressing the filter through the filter holder 300 , and in the gas detection unit 410 of the circuit board 400 . It has the effect of improving the sensing response of

The housing 100 includes a protruding protrusion 120 extending upward from the bottom surface, and the gas filter 200 and the filter holder 300 are inserted into the protruding protrusion 120 to the side protruding protrusion 120 . can be supported on

The gas filter 200 is inserted into the inlet hole 110 extending upwardly around the inlet hole 110 from the bottom surface of the housing 100, and the filter holder 300 and the first One elastic body 500 may be inserted in order.

The side of the gas filter 200 and the filter holder 300 may be fixed by the protruding jaw 120 , and the first elastic body 500 may be inserted into the elastic body insertion groove 310 so that the side thereof may be fixed. Thereafter, there is an effect of preventing the circuit board 400 from being moved laterally when the first elastic body 500 , the filter holder 300 and the gas filter 200 are pressed from above.

A gas filter ( 200) may further include a second elastic body 600 for pressing downward.

As shown in FIG. 5 , in the embodiment in which the filter holder 300 is inserted, the second elastic body 600 may be inserted between the filter holder 300 and the gas filter 200 , and the second elastic body 600 . may be formed of the same object as the first elastic body 500 .

The lower portion of the filter holder 300 in which the second elastic body 600 is positioned is formed to be symmetrical in the vertical direction in the same shape as the elastic body insertion groove 310 into which the first elastic body 500 is inserted, so that the second elastic body 600 is formed. There is an effect that can be prevented from being inserted into the second elastic body 600 from moving laterally when pressed by the circuit board 400 .

In addition, the second elastic body 600 is deformed and pressurized when the circuit board 400 is pressurized in the same way as the first elastic body 500 , thereby sealing between the filter holder 300 and the gas filter 200 and sealing the gas filter ( 200) is added, there is an effect of preventing gas from leaking from the sensing space 130 .

The inner space of the housing 100 has an open upper end, and the filter, the filter holder 300, the first elastic body 500, and the circuit board 400 may be assembled in this order through the open upper end.

The inner space of the housing 100 is opened from above, so that assembly can be improved when assembling the filter, the filter holder 300 , the first elastic body 500 , and the circuit board 400 therein.

In addition, the sensor cover 700 to cover the upper end of the open housing 100 inner space and to protect the circuit board 400 from the outside; may further include.

The sensor cover 700 covers the upper part of the housing 100 to protect the filter assembled in the open housing 100, the filter holder 300, the first elastic body 500, and the circuit board 400, and the housing ( 100) can be assembled.

6 to 8 are flowcharts of manufacturing methods for various embodiments of the gas leak detection sensor according to the present invention.

As shown in FIG. 6 , in the method of manufacturing a gas leak detection sensor according to the present invention, the gas filter 200 is formed at the bottom of the inner space of the housing 100 and the gas filter 200 is fused to the upper side of the inlet hole 110 into which the gas is injected. (S100); Assembling the first elastic body 500 to the upper side of the gas filter 200 (S400'); and applying a fixing force to the gas filter 200 by deforming the first elastic body 500 by assembling and pressing the circuit board 400 from the upper side of the first elastic body 500 downward (S500); may include.

7 to 8, in the method for manufacturing a gas leak detection sensor according to the present invention, the gas filter 200 is formed at the bottom of the inner space of the housing 100 and is positioned above the inlet hole 110 through which the gas is injected. the step of being fused (S100); Assembling the filter holder 300 to the upper side of the gas filter 200 (S300, S300'); Inserting the first elastic body 500 to the upper side of the filter holder 300 into the elastic body insertion groove 310 formed in the filter holder 300 (S400); and applying a fixing force to the gas filter 200 by deforming the first elastic body 500 by assembling and pressing the circuit board 400 from the upper side of the filter holder 300 downward (S500). It may include.

The step of assembling the second elastic body 600 to the upper side of the gas filter 200 before the step of assembling the filter holder 300 to the upper side of the gas filter 200 (S200) may be further included.

Although shown and described in relation to specific embodiments of the present invention, it is common in the art that the present invention can be variously improved and changed without departing from the spirit of the present invention provided by the following claims. It will be obvious to those who have the knowledge of

100: housing
110: inlet hole
120: protruding jaw
130: sensing space
200: gas filter
300: filter holder
310: elastic body insertion groove
400: circuit board
410: gas detection unit
500: first elastic body
600: second elastic body
700 ; sensor cover

Claims (13)

a housing having an inner space;
a gas filter installed in the housing to pass the target gas into the inner space of the housing;
A sensing space is formed between the gas filter and the gas filter by being spaced apart from the upper side of the gas filter, and a gas sensing unit for detecting gas introduced into the sensing space is provided, and the gas detected by the gas sensing unit is converted into an electrical signal. circuit board; and
A gas leak detection sensor comprising a; a first elastic body positioned between the circuit board and the gas filter to seal the side surface of the sensing space, and to provide a fixing force to the gas filter by being pressed toward the gas filter when the circuit board is coupled. The method according to claim 1,
A gas leak detection sensor, characterized in that a bottom surface is formed in the lower portion of the inner space of the housing, an inflow hole formed to allow gas to flow into the bottom surface is formed, and a gas filter is coupled to an upper side of the inflow hole in the inner space of the housing. . 3. The method according to claim 2,
Gas leak detection sensor, characterized in that the housing includes a protrusion protruding upward to surround the outside of the inlet hole on the bottom surface, and the gas filter and the first elastic body are inserted inside the protrusion protrusion and laterally supported by the protrusion protrusion . 3. The method according to claim 2,
A filter holder positioned above the gas filter to pressurize and fix the gas filter, and form a sensing space for the gas that has passed through the gas filter;
An elastic body insertion groove is formed at the upper end of the filter holder, and the first elastic body is inserted and fixed in the elastic body insertion groove. 5. The method according to claim 4,
Gas leakage detection, characterized in that an inlet hole formed to allow gas to flow into the housing is formed on the bottom surface of the housing, the diameter of the inlet hole is the same as the inner diameter of the filter holder, and the inner surface of the filter holder constitutes a side wall of the sensing space sensor. 5. The method according to claim 4,
The first elastic body is formed to have a height greater than the depth of the elastic body insertion groove, and when the circuit board is coupled to the housing, the lower surface is supported by contacting the upper end of the filter holder. Gas leak detection sensor, characterized in that lower than before assembly and pressurizing the filter holder. 5. The method according to claim 4,
A gas leak detection sensor, characterized in that the housing includes a protrusion extending upward from the bottom, and the gas filter and the filter holder are inserted into the protrusion and laterally supported by the protrusion. 6. The method of claim 5,
The gas leak detection sensor further comprising a; located between the gas filter and the lower portion of the filter holder, the second elastic body for pressing the gas filter downward when the filter holder is coupled to the gas filter. 6. The method of claim 5,
The housing inner space has an open top, and a filter, a filter holder, a first elastic body, and a circuit board are assembled in this order through the open top. 10. The method of claim 9,
The gas leak detection sensor further comprising a; a sensor cover that covers the upper end of the open housing inner space and protects the circuit board from the outside. A method of manufacturing the gas leak detection sensor of claim 1, comprising:
a step of fusing a gas filter formed on the bottom of the inner space of the housing to an upper side of an inlet hole through which gas is injected;
Assembling a first elastic body to the upper side of the gas filter; and
A method of manufacturing a gas leak detection sensor comprising: applying a fixing force to the gas filter by deforming the first elastic body by assembling the circuit board while pressing the circuit board from the upper side to the lower side. A method of manufacturing the gas leak detection sensor of claim 5,
a step of fusing a gas filter formed on the bottom of the inner space of the housing to an upper side of an inlet hole through which gas is injected;
Assembling the filter holder to the upper side of the gas filter;
inserting the first elastic body into the elastic body insertion groove formed in the filter holder to the upper side of the filter holder; and
A method of manufacturing a gas leak detection sensor comprising: applying a fixing force to the gas filter by deforming the first elastic body by assembling the circuit board while pressing the circuit board from the upper side of the filter holder to the lower side. 13. The method of claim 12,
The manufacturing method of the gas leak detection sensor further comprising; assembling a second elastic body to the upper side of the gas filter before the step of assembling the filter holder to the upper side of the gas filter.

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