CN108241006B - Gas-sensitive characteristic response curve testing device with stirring blades - Google Patents

Abstract

The invention discloses a gas-sensitive characteristic response curve testing device with stirring blades. A heating sheet is arranged at the bottom of a sample carrier, and the top surface of the sample carrier is used to carry a gas-sensitive material to be tested; The air inlet pipe, the second air inlet pipe and the air outlet pipe, wherein the outlet end of the second air inlet pipe is connected with a universal bamboo pipe; the inner cavity of the inner cover is provided with a stirring support, and a stirring support is fixed on the outer end of the stirring support along the circumferential direction. A set of driven magnets, the driven magnets are all N-pole magnets, and the outer circular surface of the driven magnet is rotatably matched with the inner wall of the inner cover; the center of the stirring support is coaxially fixed with a connecting shaft, and the two ends of the connecting shaft A group of stirring blades are evenly distributed along the circumference. In this case, on the basis of the existing structure, a non-detachable transparent inner cover is added. The inner cavity of the inner cover is insulated from the outside, so that the gas-sensitive material to be tested can be isolated from the temperature of the outside world, thereby avoiding the temperature of the outside world. Effects on gas-sensing properties.

Description

A gas sensor characteristic response curve testing device with stirring blade

technical field

The invention belongs to the field of gas-sensitive materials and gas-sensitive sensors, and in particular relates to a gas-sensitive characteristic response curve testing device with stirring blades. The device can also be used in other fields related to gas pressure and components.

Background technique

As is well known to those skilled in the art, a gas sensor is made of a gas-sensitive material and is used to measure the type, concentration and composition of a gas, to detect a specific composition in the gas, and to convert the composition parameter into an electrical signal. Or device, it is also called gas sensor. The applications of gas sensors mainly include: carbon monoxide gas detection, gas gas detection, gas detection, freon (R11, R12) detection, ethanol detection in exhaled breath, human oral bad breath detection, etc.

The gas-sensing characteristic response curve of the gas-sensing material is an important parameter of the gas-sensing material, which is related to the detection accuracy of the gas-sensing sensor, and the gas-sensing characteristic response curve is closely related to factors such as temperature, light, and gas purity. At present, the gas-sensitive material is generally fixed on an open platform, and two electrodes are used to contact the gas-sensitive material, and the gas is blown over the surface of the gas-sensitive material or the gas-sensitive material is surrounded by the detected gas as an atmosphere to test the gas-sensitive material. The gas sensitivity characteristic response curve.

During the detection process, we found that the existing technology has the following defects:

1. Since the existing test device has an open structure and is in contact with external temperature, light and impurities, it is impossible to isolate the influence of external temperature, light and impurities on the gas-sensing characteristics, resulting in the test accuracy of the gas-sensing characteristic response curve not tall;

2. The existing structure is an open structure, and the gas-sensitive material has adsorption to the gas, which leads to the unstable state of the gas near the surface of the gas-sensitive material to be tested during the test, with large randomness and irregular changes, which leads to the test results The reliability is low and the repeatability of the test data is poor, which makes the gas sensitivity test meaningless.

3. In the process of academic research, we found that in some test environments, the gas concentration and temperature field near the gas-sensitive material to be tested need to be uniform, so as to prevent the uneven gas concentration and temperature field from interfering and hindering the test. However, the existing technology Unable to resolve.

4. During the test, it may be necessary to load light of a specific wavelength under the premise of shielding the external temperature, light and impurities in order to study the influence of light on the response curve of the gas sensitivity characteristic. However, the existing technology cannot meet this technical requirement at all.

Contents of the invention

The technical problem to be solved by the present invention is to provide a gas-sensing characteristic response curve test device with stirring blades, which is intended to improve the test accuracy and reliability of the gas-sensing characteristic response curve, and to make the gas concentration and temperature near the gas-sensing material The field is uniform.

The technical scheme of the present invention is as follows: a gas sensitivity characteristic response curve testing device with stirring blades, characterized in that it includes a sample carrier (1) and an inner cover (10), wherein the bottom of the sample carrier (1) is provided with a heating sheet (2), the top surface of the sample carrier is used to carry the gas-sensitive material to be tested, and the first probe (3) and the second probe (4) are in contact with the surface of the gas-sensitive material to be tested during testing, which The two probes are respectively installed on the corresponding mounting components, and the sample carrier (1) and the adjustment component are all mounted on the flange (5); the flange (5) is provided with a first air inlet pipe ( 6), the second air inlet pipe (7) and the air outlet pipe (8), wherein the outlet end of the second air inlet pipe (7) is connected with a universal bamboo pipe (9), and the first air inlet pipe (6), the second The air inlet pipe (7) is located above the sample carrier (1), and the universal bamboo tube (9) is close to the top surface of the sample carrier;

The inner cover (10) is a transparent cover, and the inner cover covers the sample carrier (1), the heating plate (2), the first probe (3), the second probe (4), the first air inlet pipe ( 6), outside the second air intake pipe (7), air outlet pipe (8) and the universal bamboo pipe (9), and the opening end of the inner cover (10) is fixed to the outer circular surface of the flange (5) , the inner cover (10) and the flange (5) are sealed by an o-ring (11); the outer cover of the inner cover (10) has an outer cover (12), which is an opaque cover, and the inner cover The open end of (10) is detachably fixed with the outer circular surface of the flange (5), and the outer wall of the outer cover (12) is provided with a light loading port (12a) that can be opened and closed; the inner cover (10) is provided with stirring support (30) in the inner chamber, is fixed with a group of driven magnet (31) along the circumferential direction at the outer end of stirring support, and this driven magnet (31) is the magnet of N pole, and The outer circular surface of the driven magnet (31) is rotatably matched with the inner wall of the inner cover (10); the center of the stirring support (30) is coaxially fixed with a connecting shaft (32), and the two ends of the connecting shaft are evenly distributed along the circumferential direction There is a group of stirring blades (33); a turret (34) is arranged between the inner cover (10) and the outer cover (12), and the connecting end of the turret is connected with the output shaft of the drive motor (35), and can be Driving motor (35) drives down to rotate; Described turret (34) is fixedly provided with active magnet (36) along the circumferential direction, and this active magnet (36) corresponds one to one with described stirring blade (33), and active magnet ( 36) is the magnet of S pole.

In this case, on the basis of the existing structure, a non-detachable transparent inner cover (10) is added, and the inner cavity of the inner cover (10) is insulated from the outside, so that the temperature of the gas-sensitive material to be tested and the outside world can be reduced. Isolation, so as to avoid the influence of external temperature on the gas-sensing characteristics; at the same time, a detachable opaque cover is added, which can not only isolate the influence of external light on the gas-sensing characteristics, but also stabilize the gas state near the surface of the gas-sensing material to be tested. In this way, the test accuracy and reliability of the gas-sensing characteristic response curve can be improved, and the influence of external light on the gas-sensing characteristic can be tested; in addition, a light loading port is provided on the outer cover, which is convenient for loading light of a specific wavelength, so as to provide specific The impact of wavelength light on the gas-sensing characteristics provides the possibility; and, in this case, the stirring blade is driven to rotate in a non-contact manner, thereby stirring the gas and air in the inner cover, so that the gas concentration and temperature field near the gas-sensing material to be tested Uniformity, thereby avoiding the interference and obstruction of the test caused by the uneven gas concentration and temperature field, and the non-contact rotation form has relatively little influence on the temperature of the gas sensing test.

As a preference, the installation assembly includes a horizontal swing arm (13) and a vertical swing arm (16), wherein one end of the horizontal swing arm (13) snaps into a notch of the base (14), and is connected by a vertically arranged connecting screw. (15) is fixed with the base (14), and the base (14) is fixed on the flange (5), and the other end of the horizontal swing arm (13) has a U-shaped notch through up and down; The middle part of the straight swing arm (16) snaps into the U-shaped notch of the horizontal swing arm (13), and is connected with the horizontal swing arm (13) by a pin (17) arranged horizontally, and an adjustment screw ( 18), the tail of the adjustment screw is in contact with the top surface of the horizontal swing arm (13); a mounting hole is opened at the bottom of the horizontal swing arm (13), and the first probe (3) or the second probe (4) After passing through this mounting hole, lock it by the locking screw (19) on the horizontal swing arm (13).

By adopting the above technical solution, this case can conveniently adjust the position of the first probe (3) or the second probe (4) and the pressure applied to the gas-sensitive material to be tested, and the structure of the installation component is simple, and the adjustment is convenient and labor-saving.

Preferably, the stirring support (30) is in the shape of a "ten", and one driven magnet (31) is respectively fixed at the four free ends of the stirring support. By adopting the above structure, the structure is simplified as much as possible under the premise of ensuring the rotation balance.

In this case, the inner cover (10) is a quartz cover, the outer cover (12) is a ceramic cover, and the heating chip (2) is a ceramic heating chip. In the above technical solution, the ceramic cover has good light-shielding performance, and can effectively realize light-shielding.

Beneficial effects: on the basis of the existing structure, this case adds a non-detachable transparent inner cover (10), and the inner cavity of the inner cover (10) is insulated from the outside, so that the gas-sensitive material to be tested can be separated from the outside. The external temperature is isolated to avoid the influence of external temperature on the gas-sensing characteristics; at the same time, a detachable opaque outer cover is added, which can not only isolate the influence of external light on the gas-sensing characteristics, but also make the gas-sensitive material to be tested close to the surface of the gas The state is stable, so as to improve the test accuracy and reliability of the gas-sensing characteristic response curve, and can also test the influence of external light on the gas-sensing characteristics; in addition, the outer cover is equipped with a light loading port, which is convenient for loading light of a specific wavelength, so that It provides the possibility to study the influence of specific wavelength light on the gas-sensing characteristics; moreover, this case drives the stirring blade to rotate in a non-contact way, thereby stirring the gas and air in the inner cover, so that the gas concentration near the gas-sensing material to be tested And the temperature field is uniform, thereby avoiding the interference and obstruction of the test caused by the uneven gas concentration and temperature field, and the non-contact rotation form has relatively little influence on the temperature of the gas sensing test.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is an axonometric view of the test unit in Fig. 1 after removing components such as the outer cover and the drive motor.

Fig. 3 is a schematic diagram of Fig. 2 after removing the inner cover.

FIG. 4 is a schematic diagram of cooperation between the driven magnet and the driving magnet in FIG. 2 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

As shown in Figures 1-4, a gas sensitivity characteristic response curve test device with stirring blades includes a sample carrier 1 and an inner cover 10, wherein the bottom of the sample carrier 1 is provided with a heating plate 2, and the sample carrier 1 The top surface is used to carry the gas-sensitive material to be tested, and the heating sheet 2 is a ceramic heating sheet. The first probe 3 and the second probe 4 are existing structures. During the test, these two probes are in contact with the surface of the gas-sensitive material to be tested. These two probes are respectively installed on the corresponding mounting components, and the sample load Both the platform 1 and the adjustment assembly are installed on the flange 5 . The first probe 3 and the second probe 4 are respectively connected to the measuring instrument through corresponding lead wires, and the connection method is an existing structure, which will not be repeated here, and the flange 5 is provided with a lead wire through hole.

In this case, the installation assembly includes a horizontal swing arm 13 and a vertical swing arm 16, wherein one end of the horizontal swing arm 13 snaps into the gap of the base 14, and is fixed to the base 14 through a vertically arranged connecting screw 15, the base The seat 14 is fixed on the flange plate 5, and the other end of the horizontal swing arm 13 is provided with a U-shaped notch penetrating up and down. In this case, the tail of the base 14 is tightly fitted into the mounting hole on the flange 5 through an insulating sleeve (not shown in the figure), so as to prevent the electrical signals of the two probes from being short-circuited and ensure a smooth response curve of the gas sensitivity characteristic. test. The middle part of the vertical swing arm 16 snaps into the U-shaped notch of the horizontal swing arm 13, and is connected with the horizontal swing arm 13 by the pin 17 provided horizontally, and is connected with an adjustment screw 18 at the top of the vertical swing arm, and the tail portion of the adjustment screw is connected with the horizontal swing arm 13. The top surface of the horizontal swing arm 13 is in contact. There is a mounting hole at the bottom of the horizontal swing arm 13 , after the first probe 3 or the second probe 4 passes through the mounting hole, it is locked by the locking screw 19 on the horizontal swing arm 13 .

The flange 5 is provided with a first air inlet pipe 6, a second air inlet pipe 7 and an air outlet pipe 8, wherein the air outlet end of the second air inlet pipe 7 is connected with a universal bamboo pipe 9, and the air outlet of the universal bamboo pipe 9 The end is a bell mouth. The first air intake pipe 6 and the second air intake pipe 7 are located above the sample carrier 1 , the universal bamboo tube 9 is close to the top surface of the sample carrier 1 , and the air outlet end of the universal bamboo tube 9 is flat. The air outlet pipe 8 is located under the sample carrier 1 , and the first air inlet pipe 6 , the second air inlet pipe 7 and the air outlet pipe 8 are located on the same side of the flange 5 . The first air inlet pipe 6 and the second air inlet pipe 7 can be used during the static method test, and only the second air inlet pipe 7 can be used during the dynamic method test.

As shown in Figures 1, 2 and 3 and 4, the inner cover 10 is a transparent cover, preferably a quartz cover. The inner cover 10 covers the sample carrier 1, the heating plate 2, the first probe 3, the second probe 4, the first air inlet pipe 6, the second air inlet pipe 7, the air outlet pipe 8 and the universal bamboo pipe 9, And the opening end of the inner cover 10 is fixed to the outer circular surface of the flange 5, and the inner cover 10 and the flange 5 are sealed by an o-ring 11, so that the temperature between the inner cavity of the inner cover 10 and the outside can be realized to the greatest extent. isolated.

The outer cover 10 is covered with an outer cover 12, which is an opaque cover, preferably a ceramic cover. The opening end of the inner cover 10 is detachably fixed to the outer surface of the flange 5, and the outer wall of the outer cover 12 is provided with a light loading port 12a that can be opened and closed. When it is necessary to load light of a specific wavelength, the light loading port 12a When it is opened, the loaded light passes through the inner cover 10, so that the influence of light with a specific wavelength on the gas-sensing properties of the gas-sensitive material can be studied. It should be noted that, in some test cases, it is necessary to study the interference of external light on the gas-sensing characteristics, and at this time, the outer cover 12 needs to be removed.

The inner chamber of inner cover 10 is provided with a stirring support 30, and a group of driven magnets 31 are fixed along the circumferential direction at the outer end of the stirring support. The circular surface is rotatably engaged with the inner wall of the inner cover 10 . A connecting shaft 32 is coaxially fixed at the center of the stirring support 30 , and a group of mixing blades 33 are evenly distributed along the circumferential direction at both ends of the connecting shaft. A turret 34 is arranged between the inner cover 10 and the outer cover 12 , and the connecting end of the turret is connected with the output shaft, and can rotate under the drive of the drive motor 35 . The turret 34 is fixed with an active magnet 36 along the circumferential direction, and the active magnet 36 corresponds to the stirring blade 33 one by one, and the active magnet 36 is an S pole magnet. The stirring support 30 is in the shape of a "cross", and four floating ends of the stirring support are respectively fixed with a driven magnet 31 .

When the drive motor 33 starts, it drives the turret 32 to rotate, and the rotating turret 32 drives the active magnet 34 to rotate together, and the active magnet 34 drives the driven magnet 31 to rotate through magnetism, and then drives the stirring blade 33 to rotate and stir.

As shown in Figures 1, 2 and 3, the sample carrier 1, the heating plate 2, the first probe 3, the second probe 4, the flange plate 5, the first air inlet pipe 6, the second air inlet pipe 7, and the air outlet pipe 8. The universal bamboo tube 9, the inner cover 10, the o-ring 11, the outer cover 12 and the installation components constitute a test unit, and the four test units are arranged at equal intervals horizontally, and the flange plate 5 of each test unit is fixed on the vertical plate 20, and the bottom of the vertical plate 20 is fixed to the top surface of the horizontal base plate 21. When manufacturing gas-sensing materials, multiple pieces are often produced in batches. Since the gas-sensing characteristics of gas-sensing materials will change with time, this case can use 4 test units to measure 4 samples at the same time, thereby reducing the impact of time on gas-sensing characteristics. The adverse effect of the test is not to improve the detection efficiency, so this design is not a conventional design, but creative.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention. within the scope of protection.

Claims (2)

1. The utility model provides a take gas-sensitive characteristic response curve testing arrangement of stirring leaf which characterized in that: the device comprises a sample carrier (1) and an inner cover (10), wherein a heating plate (2) is arranged at the bottom of the sample carrier (1), the top surface of the sample carrier is used for bearing a gas-sensitive material to be tested, the first probe (3) and the second probe (4) are contacted with the surface of the gas-sensitive material to be tested during testing, the two probes are respectively arranged on corresponding installation components, and the sample carrier (1) and the adjustment component are both arranged on a flange plate (5); the flange plate (5) is provided with a first air inlet pipe (6), a second air inlet pipe (7) and an air outlet pipe (8), wherein the air outlet end of the second air inlet pipe (7) is connected with a universal bamboo joint pipe (9), the first air inlet pipe (6) and the second air inlet pipe (7) are positioned above the sample carrier (1), and the universal bamboo joint pipe (9) is close to the top surface of the sample carrier;

the inner cover (10) is a transparent cover, the inner cover covers the sample carrying platform (1), the heating plate (2), the first probe (3), the second probe (4), the first air inlet pipe (6), the second air inlet pipe (7), the air outlet pipe (8) and the universal bamboo joint pipe (9), the opening end of the inner cover (10) is fixed with the outer circular surface of the flange plate (5), and the inner cover (10) is sealed with the flange plate (5) through an o-shaped ring (11); the outer surface of the inner cover (10) is covered with an outer cover (12), the inner cover is an opaque cover, the opening end of the inner cover (10) is detachably fixed with the outer circular surface of the flange plate (5), and the outer wall of the outer cover (12) is provided with a light loading opening (12 a) which can be opened and closed; a stirring bracket (30) is arranged in the inner cavity of the inner cover (10), a group of driven magnets (31) are fixedly arranged at the outer end of the stirring bracket along the circumferential direction, the driven magnets (31) are N-pole magnets, and the outer circular surface of the driven magnets (31) is in running fit with the inner wall of the inner cover (10); a connecting shaft (32) is coaxially and fixedly arranged at the center of the stirring bracket (30), and a group of stirring blades (33) are uniformly distributed at two ends of the connecting shaft along the circumferential direction; a rotating frame (34) is arranged between the inner cover (10) and the outer cover (12), and the connecting end of the rotating frame is connected with the output shaft of the driving motor (35) and can rotate under the driving of the driving motor (35); the rotating frame (34) is fixedly provided with driving magnets (36) along the circumferential direction, the driving magnets (36) are in one-to-one correspondence with the stirring blades (33), and the driving magnets (36) are S-pole magnets;

the mounting assembly comprises a horizontal swing arm (13) and a vertical swing arm (16), wherein one end of the horizontal swing arm (13) is clamped into a notch of a base (14) and is fixed with the base (14) through a vertically arranged connecting screw (15), the base (14) is fixed on the flange plate (5), and the other end of the horizontal swing arm (13) is provided with a U-shaped notch which is penetrated up and down; the middle part of the vertical swing arm (16) is clamped into a U-shaped notch of the horizontal swing arm (13) and is connected with the horizontal swing arm (13) through a horizontally arranged pin (17), the top of the vertical swing arm is connected with an adjusting screw (18), and the tail part of the adjusting screw is contacted with the top surface of the horizontal swing arm (13); the bottom of the horizontal swing arm (13) is provided with a mounting hole, and after the first probe (3) or the second probe (4) passes through the mounting hole, the first probe or the second probe is locked by a locking screw (19) on the horizontal swing arm (13);

the stirring support (30) is of a cross-shaped structure, and the four suspension ends of the stirring support are respectively fixedly provided with one driven magnet (31).

2. The stirring vane equipped gas sensitive characteristic response curve testing device according to claim 1, wherein: the inner cover (10) is a quartz cover, the outer cover (12) is a ceramic cover, and the heating plate (2) is a ceramic heating plate.

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