KR102498525B1 - 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; By being spaced apart from the gas filter, a gas sensing unit is provided to form a sensing space between the gas filter and detect gas flowing into the sensing space, and convert gas detected by the gas sensing unit into an electrical signal. circuit board; and a first elastic body positioned between the circuit board and the gas filter to seal a 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.

Description

Gas leak detection sensor and its manufacturing method {GAS LEAKAGE PREVENTION SENSOR AND ITS MANUFACTURING METHOD}

The present invention relates to a gas leak detection sensor, and more particularly, to a technique for detecting leakage of a target gas through a gas filter permeating the target gas.

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

Hydrogen gas has a high risk of explosion due to leakage when used due to its flammable characteristics.

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

On the other hand, the hydrogen gas leak sensor includes a hydrogen sensor for detecting 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

A conventional hydrogen gas leak sensor has a structure in which the hydrogen sensing unit is mounted in a sensor mounting portion protruding from the top of a 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 a wire. have

The conventional hydrogen gas leak sensor has a problem in that the detecting element is a bead type, and the space occupied by the hydrogen detecting unit inside the case is wide, thereby increasing the space volume and slowing down the reaction rate of hydrogen gas leakage. In addition, the conventional hydrogen gas leak sensor has a complicated assembly process by soldering and connecting power and signal lines with wires, and there is a risk of malfunction due to contact failure.

The matters described as the background art above are only for improving understanding of the background of the present invention, and should not be taken as an admission that they correspond to prior art already known to those skilled 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 on the upper side of the gas filter forms a sensing space through which the target gas flows, The circuit board on which the gas sensing unit is formed is assembled on the upper side of the filter holder, and the gap between the circuit board and the gas filter is sealed by an elastic body to reduce the detection response time of the target gas present in the sensing space.

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; By being spaced apart from the gas filter, a gas sensing unit is provided to form a sensing space between the gas filter and detect gas flowing into the sensing space, and convert gas detected by the gas sensing unit into an electrical signal. circuit board; and a first elastic body positioned between the circuit board and the gas filter to seal a 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 on the lower part of the inner space of the housing, an inlet hole is formed on the bottom surface to allow gas to flow therein, and a gas filter may be coupled to an upper side of the inlet hole in the inner space of the housing.

The housing includes a protruding jaw extending 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 protruding jaw and supported on the protruding jaw laterally.

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

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

The first elastic body is formed to have a higher height than the depth of the elastic body insertion groove, and when the circuit board is coupled to the housing, the lower surface contacts the top of the filter holder and is supported, and the first elastic body is deformed inside the elastic body insertion groove to increase the height after assembly is lower than before assembly, and the filter holder can be pressurized.

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

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 be further included.

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

It may further include a sensor cover that covers the top 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 includes 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 while pressing downward from the upper side of the first elastic body.

A method of manufacturing a gas leak detection sensor according to the present invention includes 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 toward 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 while pressing it downward from the upper side of the filter holder.

The method may further include assembling the second elastic body onto the gas filter before assembling the filter holder onto the gas filter.

In the gas leak detection sensor according to an embodiment of the present invention, the first elastic material seals between the gas filter and the circuit board to prevent gas from leaking inside the housing.

In addition, since the inner side of the first elastic body forms a sensing space, there is an effect of reducing the sensing response time for sensing the target gas in 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 fixing the gas filter is positioned above the gas filter to fix the gas filter, and a first elastic material is interposed between the gas filter and the circuit board assembled above 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, there is an effect of shortening the sensing response time in the gas sensing unit located on the upper side of 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 the gap between the filter holder and the gas filter, thereby preventing leakage of gas in the sensing space.

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

Specific structural or functional descriptions of the embodiments of the present invention disclosed in this specification or application are merely illustrated for the purpose of explaining the embodiments according to the present invention, and the embodiments according to the present invention may be implemented in various forms. It may be and should not be construed as being limited to the embodiments described in this specification or application.

Embodiments according to the present invention can apply various changes and can have various forms, so specific embodiments are illustrated in the drawings and described in detail in this specification or application. However, this is not intended to limit the embodiments 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 technical scope of the present invention.

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

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle. Other expressions describing the relationship between elements, such as "between" and "directly between" or "adjacent to" and "directly adjacent to", etc., should be interpreted similarly.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "comprise" or "have" are intended to indicate that there is an embodied feature, number, step, operation, component, part, or combination thereof, but one or more other features or numbers However, it should be understood that it does not preclude the presence or addition of steps, operations, components, parts, or combinations thereof.

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

1 is a perspective view of a gas leak detection sensor according to an embodiment of the present invention, FIG. 2 is an A-A cross-sectional view of FIG. 1, FIG. 3 is an enlarged front view of FIG. 2, and FIG. 4 is a gas leak detection sensor according to the present invention. Cross-sectional view showing another embodiment, FIG. 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 leakage of hydrogen gas by being mounted on a hydrogen battery vehicle, and the filter and gas detection unit 410 are changed and mounted to detect gases other than hydrogen gas. It can be.

A gas leak detection sensor according to the present invention includes a housing 100 having an inner space; a gas filter 200 installed in the housing 100 to pass target gas into the inner space of the housing 100; By being spaced apart from above the gas filter 200, a sensing space 130 is formed between the gas filter 200 and a gas sensing unit 410 for detecting gas flowing into the sensing space 130 is provided. , a circuit board 400 that converts gas detected by the gas sensing unit 410 into an electrical signal; And it is located between the circuit board 400 and the gas filter 200 to seal the side 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. A first elastic body 500 providing a fixing force; includes.

As in the embodiment shown in FIG. 4, the housing 100 has an inner space, and a gas filter 200 through which target gas located outside the housing 100 can pass is located on the bottom surface of the inner 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 hydrogen gas may be a target in the present invention.

The circuit board 400 is assembled on the housing 100 above 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 the sensing space 130 ) Gas can be sensed through the gas sensing unit 410 mounted on the circuit board 400 on the upper side.

The circuit board 400 may be assembled to the housing 100 by pressing the first elastic body 500 downward. It has an effect of sealing the space 130 and also has an effect of fixing the filter holder 300 as the first elastic body 500 of the circuit board 400 is pressed downward.

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

A connector that can be 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 at the bottom of the inner space of the housing 100, and an inlet hole 110 formed to allow gas to flow into the inside is formed on the bottom surface. It can 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 a 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, and the target gas flows into the sensing space 130 formed in the inner space of the housing 100, and the gas other than the target gas flows into the housing ( 100) stays in the outer space.

The housing 100 includes a protruding jaw 120 extending upward to cover 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 is inserted inside and can be supported on the protruding jaw 120 in a lateral direction.

The protruding jaw 120 extends upward from the bottom surface of the inner space of the housing 100, is located outside the inlet hole 110, and is located on the 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, when the circuit board 400 is assembled to the upper side of the first elastic body 500 and the first elastic body 500 is pressed, the effect of preventing the first elastic body 500 and the gas filter 200 from moving sideways. there is

A filter holder 300 positioned above the gas filter 200 to pressurize and fix the gas filter 200 and to form a sensing space 130 for gas passing through the gas filter 200; further included, the 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 into and fixed to the elastic body insertion groove 310 .

2 to 3, as one of the embodiments of the present invention, a filter holder 300 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 as shown in FIGS. The first elastic body 500 is located, and the circuit board 400 is assembled above 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 pressed.

In addition, an inlet hole 110 is formed on the bottom surface of the housing 100 to allow gas to flow into the inside, the diameter of the inlet hole 110 is the same as the inner diameter of the filter holder 300, and the filter holder 300 An 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 inside, 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 detection response speed in 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 the same, the gas passing through the gas filter 200 flows into the sensing space 130 surrounded by the inner surface of the filter holder 300. It can be.

Through this, there is an effect of shortening the detection response time in the gas sensing unit 410 .

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 top 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 becomes lower than before assembly and pressurizes the filter holder 300 .

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

At this time, the first elastic body 500 may be compressed by being deformed in volume downward according to the pressurization of the circuit board 400 . Through this, the first elastic body 500 pressurizes the filter through the filter holder 300 and seals between the filter holder 300 and the circuit board 400 at the same time, and the gas detection unit 410 of the circuit board 400 There is an effect that can improve the sensing response of the.

The housing 100 includes a protruding jaw 120 extending upward from the bottom surface, and the gas filter 200 and the filter holder 300 are inserted inside the protruding jaw 120 and protrude 120 sideways. can be supported on

A gas filter 200 is inserted into the inlet hole 110 extending upward from the bottom surface of the housing 100 around the inlet hole 110, and the filter holder 300 and the filter holder 300 are placed on the upper side of the gas filter 200. 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 to be fixed to the side. Thereafter, when the circuit board 400 presses the first elastic body 500, the filter holder 300, and the gas filter 200 from above, there is an effect of preventing sideways movement.

As another embodiment of the gas leakage detection sensor according to the present invention, it is located between the gas filter 200 and the lower portion of the filter holder 300, and when the filter holder 300 is coupled to the gas filter 200, the gas filter ( 200) may further include a second elastic body 600 that presses downward.

As shown in FIG. 5, in an embodiment in which the filter holder 300 is inserted, a 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 material as the first elastic body 500.

The lower part of the filter holder 300 where the second elastic body 600 is located is formed symmetrically 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 When the second elastic body 600 is inserted and pressed by the circuit board 400, there is an effect that can be prevented from being moved laterally.

In addition, the second elastic body 600, like the first elastic body 500, is deformed and pressurized when the circuit board 400 is pressed to seal between the filter holder 300 and the gas filter 200, and the gas filter ( 200) has an effect of preventing gas from leaking in the sensing space 130.

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

The inner space of the housing 100 is open at the top, and assembling ability can be improved when assembling the filter, the filter holder 300, the first elastic body 500, and the circuit board 400 therein.

In addition, a sensor cover 700 covering the top of the inner space of the open housing 100 and protecting the circuit board 400 from the outside may be further included.

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

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

As shown in FIG. 6, the manufacturing method of the gas leak detection sensor according to the present invention is formed on 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 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 the circuit board 400 while pressing downward from the upper side of the first elastic body 500 (S500).

As shown in FIGS. 7 and 8 , in the manufacturing method of the gas leak detection sensor according to the present invention, the gas filter 200 is formed on the bottom of the inner space of the housing 100 and is formed above the inlet hole 110 into which 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 into the elastic body insertion groove 310 formed in the filter holder 300 toward the upper side of the filter holder 300 (S400); and applying a fixing force to the gas filter 200 by deforming the first elastic body 500 by assembling the circuit board 400 while pressing downward from the upper side of the filter holder 300 (S500).

A step of assembling the second elastic body 600 to the upper side of the gas filter 200 prior to 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 invention, it is common in the art that the present invention can be variously improved and changed without departing from the technical spirit of the present invention provided by the claims below. It will be self-evident to those who have knowledge of

100: housing
110: inflow 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;
By being spaced apart from the gas filter, a gas sensing unit is provided to form a sensing space between the gas filter and detect gas flowing into the sensing space, and convert gas detected by the gas sensing unit into an electrical signal. circuit board;
A filter holder in the shape of a closed curve, positioned between the circuit board and the gas filter, the inner surface forming the side of the sensing space, the lower surface in direct contact with the gas filter, and an elastic body insertion groove formed on the upper surface facing the circuit board; and
A gas leak detection sensor comprising a first elastic body that is inserted into the elastic body insertion groove of the filter holder in the shape of a closed curve and is pressed toward the gas filter when the circuit board is coupled to provide a fixing force to the gas filter and to seal between the filter holder and the circuit board. . The method of claim 1,
A gas leak detection sensor characterized in that a bottom surface is formed at the bottom of the inner space of the housing, an inlet hole is formed on the bottom surface so that gas flows into the inside, and a gas filter is coupled to the upper side of the inlet hole in the inner space of the housing. . The method of claim 2,
The housing includes a protruding jaw extending upward to surround the outside of the inlet hole on the bottom surface, and a gas filter and a first elastic body are inserted into the protruding jaw and supported on the protruding jaw laterally. . delete The method of claim 1,
Gas leak detection characterized in that an inlet hole is formed on the bottom surface of the housing to allow gas to flow into the inside, 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. The method of claim 1,
The first elastic body is formed to have a higher height than the depth of the elastic body insertion groove, and when the circuit board is coupled to the housing, the lower surface contacts the top of the filter holder and is supported, and the first elastic body is deformed inside the elastic body insertion groove to increase the height after assembly Gas leak detection sensor, characterized in that is lower than before assembly and pressurizes the filter holder. The method of claim 1,
A gas leak detection sensor, characterized in that the housing includes a protruding jaw extending upward from the bottom surface, and a gas filter and a filter holder are inserted into the protruding jaw and supported on the protruding jaw laterally. The method of claim 5,
The gas leak detection sensor further comprising 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. The method of claim 5,
A gas leak detection sensor, characterized in that the inner space of the housing has an open top, and a filter, a filter holder, a first elastic body, and a circuit board are assembled in the order through the open top. The method of claim 9,
The gas leak detection sensor further comprising a; sensor cover covering the top of the open housing inner space and protecting the circuit board from the outside. A method of manufacturing the gas leak detection sensor of claim 1,
fusion of a gas filter to an upper side of an inlet hole formed at the bottom of the inner space of the 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 toward the upper side of the filter holder; and
A method of manufacturing a gas leak detection sensor, comprising: applying a fixing force to a gas filter by deforming the first elastic body by assembling the circuit board while pressing downward from the upper side of the first elastic body. delete The method of claim 11,
A method of manufacturing a gas leak detection sensor, further comprising assembling a second elastic body onto an upper side of the gas filter before assembling the filter holder onto the upper side of the gas filter.

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