KR102553559B1 - Gas sensor testing apparatus - Google Patents

Abstract

A gas sensor testing apparatus is provided. The gas sensor testing apparatus comprises: a test enclosure which has a receiving space formed therein; a gas injection inlet unit which is formed on one side of the test enclosure; a test sensor holding unit which is placed inside the test enclosure; and a test gas distribution block which includes a flow path forming part that is placed between the gas injection inlet unit and the test sensor holding unit, allows test gas injected through the gas injection inlet unit to be passed through a flow path therein and discharged to the outside, and includes porous media forming the flow path into a plurality of irregular flow paths, so that the test gas is supplied under reduced pressure into the test enclosure through the flow path forming part.

Description

Gas sensor testing apparatus {Gas sensor testing apparatus}

The present invention relates to a sensor test apparatus, and more particularly, to a gas sensor test apparatus capable of more accurately testing a gas sensor without errors.

Various measuring instruments are used to measure contaminants. Contaminant measuring devices may be implemented in various forms depending on measurement objects, measurement methods, measurement accuracy, and the like. In the case of a measuring device for measuring a gaseous substance, a measuring device having a built-in gas sensor such as a semiconductor type or an electrochemical type is widely used.

Such a gas sensor has advantages such as a high cost performance and a possibility of miniaturization, and thus has a high degree of applicability. However, since it has a disadvantage that the precision may be lowered depending on the usage conditions or situations, various tests are needed. For this reason, a technique for inspecting the measurement accuracy and precision of the conventional gaseous substance measurement sensor has also been developed (eg, Korean Patent No. 10-1613655).

In addition, a technique for identifying the operating characteristics of the sensor through testing and compensating possible measurement errors is required, but the following problems are known to occur during testing. For example, problems such as non-uniformity of the concentration of the test gas or malfunction of the sensor due to high gas pressure during sensor operation tests are known, but there is no suitable alternative, which is an obstacle to technology development.

Republic of Korea Patent Registration No. 10-1613655, (2016. 04. 29), specification

A technical problem of the present invention, as to solve these problems, is to provide a gas sensor test device that can more accurately test the gas sensor without errors.

The technical problem of the present invention is not limited to the above-mentioned problems, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

A gas sensor test apparatus according to the present invention includes a test box having an accommodation space therein; an inlet for gas injection formed on one side of the test enclosure; a test sensor holder disposed inside the test enclosure; and a porous media disposed between the gas injection inlet and the test sensor mounting portion to pass the test gas injected into the gas injection inlet through an internal flow path and discharge the test gas to the outside while forming the flow path into a plurality of irregular flow paths. A test gas distribution block including a passage forming portion made of and supplying the test gas by reducing the pressure to the inside of the test enclosure through the passage forming portion.

The test gas distribution block has one surface in contact with the gas injection inlet, and is larger than the one surface and is formed of a flat or curved surface formed by the flow path forming part, and has a diffusion surface surrounding the outer surface of the test gas distribution block. can include

The flow path forming unit may be formed of a particle sintered body including a plurality of sintered particles for adjusting the average diameter of the flow path.

Metal particles may be included in at least some of the sintered particles.

Among the diffusion surfaces, a first surface having an area smaller than a detection surface of the gas sensor mounted on the test sensor holder may face the test sensor holder.

Among the diffusion surfaces, a second surface having a larger area than the first surface may be arranged in a direction different from that of the first surface.

The gas sensor test apparatus may further include a gas discharge hole formed on the other side of the test enclosure.

The gas sensor test device may include: a test gas supply pipe connected to the gas injection inlet; and a test gas supply chamber supplying the test gas from the front end of the test enclosure through the test gas supply pipe.

In the test gas supply chamber, a standard gas inlet into which standard gas is introduced on one side and a zero gas inlet into which zero gas is mixed with the standard gas to generate the test gas are introduced, and the other side has the An end of the pipe for supplying the test gas is connected, and may include a plurality of diaphragms for changing the flow path that are distributed between one side and the other side to divide the space.

The diaphragm for changing the flow path includes a center plate disposed at the center of the test gas supply chamber and a plurality of distribution plates spaced apart from the center plate and distributedly disposed toward a side surface of the test gas supply chamber, wherein the test gas supply chamber The chamber may further include an internal flow path that is changed according to an area and a distance between the center plate and the dispersion plate.

According to the present invention, it is possible to test the gas sensor while avoiding malfunction, especially due to pressure. In addition, it is possible to provide diluted test gas with a uniform concentration, so more accurate results can be obtained during sensor testing. Since the present invention can provide a test gas with an effective pressure dispersion structure, it is very advantageous for testing a sensor sensitive to pressure, etc., and for identifying operating characteristics.

1 is a perspective view of a gas sensor test apparatus according to an embodiment of the present invention.
2 is an enlarged view of a test enclosure of the gas sensor test apparatus of FIG. 1;
Figure 3 is a cross-sectional view showing the inside of the test enclosure of Figure 2;
FIG. 4 is a view for explaining the detailed structure of the test gas distribution block shown in FIG. 3 .
5 is an operation diagram of the test gas distribution block of FIG. 4 .
6 is a cutaway perspective view of a test gas supply chamber in the gas sensor test apparatus of FIG. 1;
FIG. 7 is an operation diagram showing the inside of the test gas supply chamber of FIG. 6 .

Advantages and features of the present invention and methods for achieving them will become clear with reference to the detailed description of the following embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms, but only the present embodiments make the disclosure of the present invention complete and the common knowledge in the art to which the present invention belongs. It is provided to fully inform the possessor of the scope of the invention, and the invention is defined only by the claims. Like reference numerals designate like elements throughout the specification.

Hereinafter, a gas sensor test apparatus according to the present invention will be described in detail with reference to FIGS. 1 to 7 .

1 is a perspective view of a gas sensor test apparatus according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a test enclosure of the gas sensor test apparatus of FIG. 1 .

Referring to FIG. 1 , a gas sensor test apparatus 1 according to the present invention includes a test box 100 accommodating a gas sensor for testing therein (see D in FIG. 2 ). The test box 100 introduces a test gas to one side and provides it to an internal sensor. Operation characteristics of the gas sensor may be tested by disposing the gas sensor inside the test enclosure 100 and measuring the introduced test gas.

Referring to FIG. 2 , a test gas distribution block 130 is disposed inside the test enclosure 100 . The test gas distribution block 130 is formed of a porous structure, and the test gas is reduced and supplied into the test enclosure 100 through the porous structure. As the test gas passes through the block 130 for test gas distribution, the flow path is diversified through a plurality of irregular flow paths, thereby avoiding applying excessive pressure to the test gas sensor D.

Due to this, the present invention can solve the problem that the sensor is pressurized and malfunctions, such as the test gas continuously supplied into the test enclosure 100. Also, as will be described later, since the concentration of the test gas is maintained uniformly, a more accurate test is possible.

The gas sensor test apparatus 1 of the present invention is configured as follows. The gas sensor test device 1 includes a test enclosure 100 having an accommodation space therein, a gas injection inlet 110 formed on one side of the test enclosure 100, and a test sensor disposed inside the test enclosure 100. It is disposed between the holder 120 and the gas injection inlet 110 and the test sensor holder 120, and the test gas injected into the gas injection inlet 110 is passed through the internal flow path (131b in FIG. 4). Reference) and discharged to the outside, but including a flow path forming unit (see 131 in FIG. 3) made of porous media to form the flow path into a plurality of irregular flow paths, the test gas is introduced into the test enclosure 100 through the flow path forming unit. It includes a test gas distribution block 130 that is supplied by reducing pressure.

Referring to FIG. 1, in one embodiment of the present invention, the gas sensor test apparatus 1 includes a test gas supply pipe 210 connected to a gas injection inlet 110 and a test gas supply pipe 210. A test gas supply chamber 200 for supplying test gas from the front end of the test enclosure 100 may be further included. That is, the test gas supply chamber 200 may be configured in a form connected to the test enclosure 100 through the test gas supply pipe 210 . Through this configuration, for example, as shown in FIG. 1, it is possible to place a plurality of test enclosures 100 along the test gas supply pipe 210 and test a plurality of gas sensors using each test enclosure 100, respectively. do.

Hereinafter, the configuration and operational effects of the present invention will be described in more detail based on such an embodiment of the present invention. First, the test enclosure and related structures and their operational effects will be described in detail.

Referring to FIG. 2 , the test enclosure 100 may be formed as a kind of tubular body having an accommodation space therein. As shown in FIG. 1 , the test enclosure 100 may be connected to the test gas supply pipe 210 to receive the test gas C. As described above, the test enclosure 100 may be formed in plural and may have a size suitable for testing each gas sensor.

One side (eg, lower end) of the test enclosure 100 can be formed in the form of a detachable cover (not shown), and therefore, the inside of the test enclosure 100 can be opened if necessary (eg, when a gas sensor is inserted). do.

Referring to FIG. 2 , the test enclosure 100 is formed in a size suitable for accommodating the gas sensor D therein. The test enclosure 100 continuously introduces and discharges the test gas into the internal accommodation space. Therefore, during the test, the inside of the test enclosure 100 can be maintained in a state substantially filled with the test gas. The test enclosure 100 may be formed in a cylindrical shape, but may be deformed as needed, so it is not necessary to be limited to the illustrated form.

An inlet 110 for gas injection is formed on one side of the test enclosure 100 . The gas injection inlet 110 may include a conduit through which test gas is introduced into the test enclosure 100 . The gas injection inlet 110 may include a support for fixing or supporting the outside of the test enclosure 100 at a connection point connected to the test enclosure 100 . The gas injection inlet 110 is formed in a tubular structure communicating with the inside of the test enclosure 100 .

A hole 140 for gas discharge may be formed on the other side of the test enclosure 100 as shown. The gas discharge hole 140 serves to discharge a portion of the test gas injected into the enclosure body, and may also serve to adjust the internal pressure through it. A gas discharge hole 140 may be formed in an appropriate size so that an appropriate amount of the test gas C is maintained inside the enclosure.

Inside the test enclosure 100, the test sensor holder 120 is disposed. The test sensor holder 120 is disposed inside the test enclosure 100 to support the gas sensor D to be tested. The test sensor holder 120 may be formed, for example, as a plate-shaped structure capable of supporting and supporting the gas sensor D, but it is not necessary to be limited thereto, and the shape of the test enclosure 100, the gas sensor ( D) can also be transformed into other shapes corresponding to the shape, size of the test enclosure 100, and the like. Therefore, the test sensor holder 120 also need not be limited to the illustrated shape. That is, instead of a separate structure as shown, one side (eg, lower end) of the test enclosure 100 itself may correspond to the mounting portion, and when one side (eg, lower end) of the test enclosure is opened, the test enclosure Of course, the bottom surface on which the 100 is installed may correspond to the mounting portion.

The test gas distribution block 130 is disposed between the gas injection inlet 110 and the test sensor holder 120 . One side of the test gas distribution block 130 is connected to the gas injection inlet 110, and the other side not in contact with the gas injection inlet 110 is exposed to the inside of the test enclosure 100. The remaining surface of the test gas distribution block 130 that is not connected to the gas injection inlet 110 may be formed as a diffusion surface (see 130-1 in FIG. 3) through which the test gas is discharged.

In particular, the test gas distribution block 130 includes a flow path forming unit (see 131 in FIG. 3 ) forming an irregular flow path through a porous structure. The flow path forming unit 131 is made of porous media that passes the test gas through an internal flow path and discharges it to the outside, but forms the flow path into a plurality of irregular flow paths. Through the passage forming part 131, the test gas can be very effectively reduced in pressure and supplied into the test enclosure 100.

3 is a cross-sectional view showing the inside of the test enclosure of FIG. 2, and FIG. 4 is a view for explaining the detailed structure of the test gas distribution block shown in FIG.

Referring to Figures 3 and 4, the inside of the test enclosure 100 will be described in more detail. As shown, the test gas distribution block 130 is located between the gas injection inlet 110 and the test sensor holder 120 inside the test enclosure. The test gas distribution block 130 may be detachably formed. For example, when the end of the gas injection inlet 110 is partially exposed to the inside of the test enclosure 100, the gas injection inlet 110 ) It may be detachably coupled with the end of.

As described above, the test gas distribution block 130 includes the flow path forming part 131 . The flow path forming part 131 may be formed on a part or all of the test gas distribution block 130 . That is, it is also possible to form the test gas distribution block 130 which includes a part of the passage forming part or is substantially entirely composed of the passage forming part. In this embodiment, the flow path forming part 131 is exemplified in a form constituting the remaining parts except for the detachable structure of the block 130 for test gas distribution.

Since the flow path forming unit 131 forms a flow path of the test gas distribution block 130, the 'flow path' of the flow path forming unit 131 is substantially the same as the 'flow path' of the test gas distribution block 130. . Therefore, the flow path of the test gas distribution block 130 or the flow path of the flow path forming unit 131 has the same meaning.

The flow path forming unit 131 is located in the middle of the flow path of the test gas flowing from the gas injection inlet 120 into the test enclosure 100 and forms a flow path through which the test gas passes as a plurality of irregular flow paths. The flow path forming unit 131 may be formed of a porous medium, and the flow path may be irregularly formed with an internal porous structure.

The detailed structure of the flow path forming part 131 can be confirmed through FIG. 4 . Referring to FIG. 4 , the flow path forming unit 131 includes a flow path 131b formed of a plurality of irregular flow paths therein. The flow path 131b inside the flow path forming part 131 is formed by the porous structure of the flow path forming part 131 made of porous media.

Since the flow path 131b is formed by a porous structure, the flow path 131b may be very irregular (see enlarged view). Therefore, the test gas injected along the passage 131b can also be distributed and diffused (meaning diffusion into the block) while passing through the inside of the test gas distribution block 130 in an irregular path due to the irregularity of the passage 131b. there is. In the process of distribution and diffusion inside the block, the test gas is naturally depressurized.

In addition, the porous structure is more effective in distribution and diffusion of the test gas because the test gas can pass through various paths through some or all of the porous structure without limiting the flow path to a specific path. As such, for example, as shown in FIG. 3, the test gas (C) may be depressurized in an irregular direction and supplied to the inside of the test enclosure 100 by the flow path forming unit 131 made of porous media.

Referring to FIG. 3, the test gas distribution block 130 has one surface in contact with the gas injection inlet 110 and is larger than the one surface, and the diffusion surface 130 made of a flat or curved surface formed by the flow path forming part 131 -1). The diffusion surface 130-1 may be formed to surround the outer surface of the test gas distribution block 130.

For example, the test gas distribution block 130 may be formed as a three-dimensional block with a flat bottom and a curved cylindrical circumference. The diffusion surface 130-1 may be formed to surround the entire circumference of the test gas distribution block 130. Therefore, the test gas C can be spread over a wider surface and supplied to the inside of the test enclosure 100 .

Referring to FIG. 4 , the flow path forming part 131 may be made of a sintered particle body including a plurality of sintered particles 131a for adjusting the average diameter of the internal flow path 131b. That is, the flow path forming part 131, which is a porous medium, can be formed by densely concentrating the plurality of sintered particles 131a. At least some of the sintered particles 131a may include metal particles, and the metal particles may include, for example, those formed of a material such as stainless steel. The flow path forming part 131 may be formed by sintering the sintered particles 131a at an appropriate temperature and pressure.

Accordingly, the internal passage 131b may be changed into various shapes depending on the size and sintering state of the sintered particles 131a. In particular, the sintered particles 131a can adjust the gas pressure, flow characteristics, and flow speed that are distributed and diffused into the inside by adjusting the average diameter of the flow path 131b. Therefore, by changing the diameter, shape, material, size, etc. of the sintered particles 131a, it is possible to more effectively adjust the flow direction and discharge pressure of the test gas by changing the dense state and sintered state of the particles.

The enlarged view of FIG. 4 illustrates the cross-section of the sintered particles 131a and irregularly formed channels 131b therebetween. The sintered particles 131a may be irregularly dense with each other, and the passages 131b may also be irregularly formed between the densely packed particles. Therefore, when the test gas is injected into the gas injection inlet 110, the test gas passes through the irregular passage 131b inside the test gas distribution block 130, is distributed and diffused, and is reduced in pressure.

In the drawings, the sintered particles 131a are shown with the same particle diameter, but this is merely omitting detailed structures for convenience, and the sintered particles 131a may be substantially irregular. The channel 131b may be formed more irregularly due to irregularities of the surface of the sintered particles 131a.

5 is an operation diagram of the test gas distribution block of FIG. 4 .

With this structure, the test gas C can be irregularly distributed and diffused along the passage 131b inside the block 130 for test gas distribution, as shown in the example of FIG. 5 . The test gas (C) injected into the block is naturally depressurized during distribution and diffusion. After decompression, the test gas (C) is discharged to the diffusion surface (see 130-1 in FIG. 3) outside the block through the irregular passages 131b, and the discharge direction is randomly formed. Therefore, since it is difficult for the test gas C to be concentrated in a specific direction or space even inside the test enclosure 100, the internal space of the test enclosure 100 can be homogeneous. Therefore, it is possible to effectively solve problems such as unnecessary pressure being concentrated on the sensor side.

In particular, the first surface 130-1a of the diffusion surface 130-1 is the detection surface (D1 in FIG. 3) of the gas sensor (see D in FIG. 3) mounted on the test sensor holder (see 120 in FIG. 3). Reference) as a surface with a smaller area than the test sensor mounting portion 120 is disposed to face. Therefore, the pressure that can be acted upon by the gas sensor D mounted on the test sensor holder 120 is further reduced. In addition, among the diffusion surfaces 130-1, the second surface 130-1b having a larger area than the first surface 130-1a is arranged in a direction different from that of the first surface 130-1a, as shown. It prevents direct discharge to the gas sensor (D). In addition, since most of the test gas (C) is discharged to the wider second surface (130-1b), the discharge pressure is further reduced. With this structure, problems such as concentration of pressure on the gas sensor inside the test box can be solved.

Therefore, as shown in FIG. 3, the gas sensor D is disposed inside the test enclosure 100, and the detection surface D1 of the gas sensor D is connected to the first surface 130-1a of the test gas distribution block 130. , and the wider second surface 130-1b is disposed in a direction that does not face the detection surface D1, so that the test operation can proceed smoothly. Even if the volume of the test enclosure 100 is relatively small, the pressure applied to the sensor is relieved by the reduced pressure of the test gas distribution block 130, so that the test gas C is continuously supplied into the test enclosure 100 without any problems. Sensors can be tested. In addition, since the test gas (C) dispersed and provided into the test housing 100 maintains a uniformly mixed state inside, the gas sensor (D) can act with the homogeneous test gas (C) without concentration change. In this way, it is possible to prevent malfunction of the gas sensor D and perform an accurate test.

Hereinafter, the test gas supply chamber and related structures of the gas sensor test device and their operational effects will be described in detail.

FIG. 6 is a cutaway perspective view of a test gas supply chamber in the gas sensor test apparatus of FIG. 1 , and FIG. 7 is an operating view showing the inside of the test gas supply chamber of FIG. 6 .

Meanwhile, referring to FIG. 6 , the gas sensor test apparatus may also include a structure for generating and supplying test gas to the inside of the test enclosure. The gas sensor test device is the front end of the test enclosure (see 100 in FIG. 1) through the test gas supply pipe 210 connected to the gas injection inlet (see 110 in FIG. 1) and the test gas supply pipe 210. A test gas supply chamber 200 for supplying a test gas may be further included.

Referring to FIG. 6 , the test gas supply chamber 200 may be formed in the form of a rectangular cylinder. Looking at the internal structure, the standard gas inlet 201 into which the standard gas (A) flows into one side of the test gas supply chamber 200, and the zero gas (B) mixed with the standard gas to generate the test gas (C) ) The zero gas inlets 202 into which the inflow is introduced are arranged alternately, and the end of the test gas supply pipe 210 is connected to the other side. As shown between one side and the other side, the test gas supply chamber 200 includes a plurality of flow path changing diaphragms 203 that are distributed and divide the space.

The test gas supply chamber 200 may have a substantially closed chamber structure. The test gas supply chamber 200 introduces a standard gas (A) and a zero gas (B) into the inside and generates a test gas (C) by diluting the standard gas (A). The standard gas (A) may be, for example, a gaseous material to be measured by a gas sensor at a constant concentration, and the zero gas (B) may be a gas for dilution. The zero gas (B) may be, for example, air and/or nitrogen gas.

The test gas supply pipe 210 is connected to the test gas supply chamber 200 and supplies the test gas C to the test enclosure 100 as described above. The test enclosure 100 is connected to one side of the test gas supply pipe 210 through the aforementioned gas injection inlet 110 or the like (see FIG. 1 ).

Although not shown, a gas control valve may be installed in at least one of the test gas supply pipe 210 and/or the gas injection inlet 110 of the test enclosure 100 . Therefore, it is also possible to control the supply amount of the test gas on the pipe line.

In particular, the test gas supply chamber 200 uniformly mixes the test gas C through the diaphragm 203 for changing the flow path therein. The diaphragm 203 for changing the flow path is distributed inside the test gas supply chamber 200 as shown.

Referring to FIG. 7 , the diaphragm 203 for changing the flow path is spaced apart from the central plate 2031 disposed at the center of the test gas supply chamber 200 and the central plate 2031 toward the side of the test gas supply chamber 200. A plurality of dispersion plates 2032 that are distributedly arranged may be included. The test gas supply chamber 200 may include an internal passage 204 that is changed according to the area and interval between the center plate 2031 and the distribution plate 2032 .

As shown in FIG. 7 , the internal passage 204 may be formed as a space partitioned by a central plate 2031 and a distribution plate 2032 . That is, the internal passage 204 is formed as a kind of flow space between the center plate 2031 and the dispersion plate 2032 . The internal flow path 204 is deformed according to the arrangement of the center plate and the distribution plate, and the flow paths of the standard gas (A) and the zero gas (B) introduced into the test gas supply chamber 200 can be changed in various ways.

Therefore, by adjusting the arrangement of the central plate 2031 and the dispersion plate 2031, the internal passage 204 having various paths and widths can be formed, and the gas is flowed through the internal passage 204 to obtain a uniformly mixed test gas (C) can be created. The internal passage 204 may be changed according to the area and spacing between the central plate 2031 and the distribution plate 2032 .

That is, the center plate 2031 is disposed at the center of the test gas supply chamber 200 to block a path passing through the center, and the distribution plate 2032 is disposed at the side of the test gas supply chamber 200 along the side. block the path of progress. Accordingly, the gas inside the test gas supply chamber 200 repeatedly changes its path at the point where the center plate 2031 and the distribution plate 2032 are disposed. The internal passage 204 is formed between the central plate 2031 and the distribution plate 2032 to induce such a path change.

The internal passage 204 may be variously changed according to the area and spacing between the central plate 2031 and the distribution plate 2032 . As the area of the center plate 2031 increases, the mixed gas flows toward the side of the test gas supply chamber 200, and the internal passage 204 may become narrow. As the area of the distribution plate 2032 increases, the mixed gas flows toward the center of the test gas supply chamber 200, and the internal passage 204 may become narrow.

In addition, since the width of the internal passage 204 can be increased or decreased by adjusting the distance between the central plate 2031 and the dispersion plate 2032, the area and distance between the central plate 2031 and the dispersion plate 2032 can be adjusted to It is possible to effectively control the number of times the mixed gas repeatedly flows through the center and the side of the chamber, the flow rate of the mixed gas, and the residence time. Through this, the mixture of the standard gas (A) and the zero gas (B) injected into the test gas supply chamber 200 flows through various paths and the residence time is increased to obtain a homogeneous test gas (C) diluted to an appropriate concentration. can create

On one side of the test gas supply chamber 200, the standard gas inlet 201 and the zero gas inlet 202 are alternately arranged. Therefore, when flowing into the chamber, gases from both sides can be mixed more quickly. In addition, since the mixture flows along the internal flow path 204 formed between the center plate 2031 and the dispersion plate 2032, the flow can be repeated and mixed homogeneously.

The test gas supply chamber 200 may include a discharge unit 205 at an appropriate location, and the internal pressure may be adjusted while discharging gas through the discharge unit 205 . The standard gas inlet 201 , the zero gas inlet 202 , and the outlet 205 may all be formed in a structure such as a conduit penetrating the test gas supply chamber 200 .

Although not shown, the center plate 2031 and the distribution plate 2032 may be fixed by disposing appropriate supports (not shown) inside the test gas supply chamber 200 . The arrangement structure of the central plate 2031 and the distribution plate 2032 can be changed in various forms by appropriately utilizing a support stand or other support structures.

In this way, a more homogeneously mixed test gas (C) can be generated using the diaphragm 203 for changing the flow path disposed inside the test gas supply chamber 200, and the generated test gas (C) is used for supplying the test gas It can be supplied to the aforementioned test enclosure 100 through the pipe 210. As described above, since the test gas distribution block (see 130 in FIG. 4) reduces the supplied test gas (C) inside the test enclosure 100 and provides it again, malfunction of the gas sensor (see D in FIG. 3) is effectively prevented. do. In addition, as described above, since the test gas (C) homogeneously mixed at an appropriate concentration is provided, the gas sensor (D) test operation can be performed very smoothly. In this way, a gas sensor test device can be formed.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art can realize that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. you will be able to understand Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting.

1: Gas sensor test device
100: test enclosure 110: inlet for gas injection
120: test sensor holder 130: block for test gas distribution
131: flow path forming part 131a: sintered particles
131b: Euro 130-1: Diffusion surface
130-1a: first surface 130-1b: second surface
140: gas discharge hole 200: test gas supply chamber
201: standard gas inlet 202: zero gas inlet
203: diaphragm for changing passage 204: internal passage
205: discharge unit 210: piping for test gas supply
2031: central plate 2032: dispersion plate
A: standard gas B: zero gas
C: test gas D: gas sensor
D1: detection surface

Claims (10)

A test enclosure having an accommodation space therein;
an inlet for gas injection formed on one side of the test enclosure;
a test sensor holder disposed inside the test enclosure; and
Porous media disposed between the gas injection inlet and the test sensor mounting portion to pass the test gas injected into the gas injection inlet through an internal flow path and discharge it to the outside, but form the flow path into a plurality of irregular flow paths. Including a test gas distribution block for supplying the test gas to the inside of the test enclosure by reducing the pressure through the flow passage forming portion, including a flow path forming portion formed,
The gas injection inlet part is formed in a tubular structure communicating with the inside of the test enclosure, and the test gas distribution block is detachably coupled to the end of the gas injection inlet part so that the flow path forming part except for the detachable structure is formed. make up,
The test gas distribution block,
The outer surface is formed as a three-dimensional block made of a flat and cylindrical curved surface and placed inside the test box,
One surface is in contact with the inlet for gas injection, and is larger than the one surface and is formed of a flat or curved surface formed by the flow path forming part and includes a diffusion surface surrounding the outer surface of the test gas distribution block,
Among the diffusion surfaces, a first surface having a smaller area than the detection surface of the gas sensor mounted on the test sensor holder is disposed facing the test sensor holder, and a second surface of the diffusion surfaces having an area larger than the first surface is Arranged in a direction different from the first surface,
The problem of concentration of pressure in the gas sensor can be solved by conducting the test work in a state in which the detection surface of the gas sensor faces the first surface and the second surface is disposed in a direction not facing the detection surface. Gas sensor test apparatus, characterized in that there is. delete According to claim 1,
The flow path forming unit is a gas sensor test device made of a particle sintered body containing a plurality of sintered particles for adjusting the average diameter of the flow path. According to claim 3,
Gas sensor test apparatus containing metal particles in at least some of the sintered particles. delete delete According to claim 1,
Gas sensor test apparatus further comprising a gas discharge hole formed on the other side of the test enclosure. According to claim 1,
a test gas supply pipe connected to the gas injection inlet; and
Gas sensor test apparatus further comprising a test gas supply chamber for supplying the test gas from the front end of the test enclosure through the test gas supply pipe. According to claim 8,
The test gas supply chamber,
A standard gas inlet into which standard gas is introduced on one side and a zero gas inlet into which zero gas mixed with the standard gas flows to generate the test gas are alternately arranged, and the other end of the pipe for supplying the test gas A gas sensor test device including a plurality of flow path change diaphragms connected to and distributedly disposed between one side and the other side to divide the space. According to claim 9,
The diaphragm for changing the flow path includes a central plate disposed at the center of the test gas supply chamber, and a plurality of distribution plates spaced apart from the central plate and distributedly disposed toward the side surface of the test gas supply chamber,
The test gas supply chamber further comprises an internal flow path that is changed according to an area and a distance between the center plate and the distribution plate.

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