CN201037840Y

CN201037840Y - Carbon dioxide monitoring instrument

Info

Publication number: CN201037840Y
Application number: CNU2007201463788U
Authority: CN
Inventors: 拉尔夫·克林伯格
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-05-31
Filing date: 2007-05-31
Publication date: 2008-03-19
Anticipated expiration: 2017-05-31

Abstract

The utility model relates to a carbon dioxide monitor comprising shell body, a carbon dioxide sensor, a processing circuit and a LED display column, wherein, the carbon dioxide monitor is inversely arranged in an opening at the bottom of the shell body; the LED display column comprises a plurality of LEDs, and each LED corresponds to certain carbon dioxide concentration level; the processing circuit converts signals monitored by the carbon dioxide sensor and drives the LED corresponding to and all LEDs below carbon dioxide concentration level of the LED display column to illuminate according to converted signals. The carbon dioxide monitor of the utility model visually reflect carbon dioxide concentrate level by different illumination height and color of the LED display column, simple and identifiable, and is applied in particular to children. As the carbon dioxide sensor of the utility model is inversely arranged at the bottom of the monitor, the utility model can reduce impact of dust accumulation on sensor sensitivity, and also avoid impact of carbon dioxide exhaled by human on monitoring result of the monitor.

Description

Capnometer

Technical field

The utility model relates to the air monitering device, more particularly, relates to a kind of capnometer of monitoring Carbon Dioxide in Air content.

Background technology

Under the normal condition, contain 78% nitrogen in the air, 21% oxygen, 1% argon gas, water vapor and carbon dioxide.Concentration of carbon dioxide approximately is 400ppm in the fresh air, and muddy carbon dioxide in air concentration is approximately 1500ppm.When the concentration of Carbon Dioxide in Air surpassed 4000ppm, people will feel like a boiled rag.

Everyone knows the importance of oxygen for people's life, is the carbon dioxide that we breathe out but people have forgotten the second important gas.During the excessive concentration of Carbon Dioxide in Air, can make the people feel tired out, can not concentrate on.When the concentration of Carbon Dioxide in Air reached 800ppm, it is tired that susceptibility crowd just can feel, lacks notice, and can have a headache.When gas concentration lwevel reaches 1500ppm, there has been 98% people above-mentioned symptom can occur.The efficient of holding a meeting in the high meeting room of gas concentration lwevel is and is low, because the participant can't focus one's attention on.Also be so same on class in the high teacher of gas concentration lwevel.The driver can't focus one's attention on when driving in the high automobile the inside of gas concentration lwevel, thereby be prone to accidents.

Because the carbon dioxide colorless and odorless can only be monitored by measuring.In the relatively low environment that takes up room per capita, for example car, public transport, meeting room, teacher etc. need strict control concentration of carbon dioxide.Show that according to medical research a people per hour needs about 30 cubic metres fresh air, and one 12 square metres and highly be that 2.5 meters vacant room just has 30 cubic metres space.At present, the measurement of gas concentration lwevel not only can only be carried out at chemical laboratory, uses the monitor of carbon dioxide sensor to develop in a large number.But the existing monitor instrument is still too professional, and particularly the demonstration of gas concentration lwevel generally all adopts the form of direct concentration numerical value or percentages to represent, identification gets up not to be easily, and is very not directly perceived.Especially for the preprimary child, they also are not familiar with numeral, thus can't identification have the shown gas concentration lwevel of various capnometers now, thereby can't clearly recognize concentration of carbon dioxide in the environment.

The utility model content

The technical problems to be solved in the utility model is, above-mentioned deficiency at prior art, a kind of easy capnometer easy to identify is provided, reflects the gas concentration lwevel that is monitored intuitively by LED post with different luminances and different colours.

The technical scheme that its technical matters that solves the utility model adopts is: propose a kind of capnometer, comprise housing, carbon dioxide sensor, treatment circuit and LED display column; Described carbon dioxide sensor upside-down mounting is in the opening of housing bottom; Described LED display column comprises a plurality of LED, wherein the corresponding certain gas concentration lwevel level of each LED; The signal that described treatment circuit conversion carbon dioxide sensor monitors also drives the LED of corresponding gas concentration lwevel level in the described LED display column and is lower than all LED of described gas concentration lwevel level luminous according to the signal after the conversion.

In the above-mentioned capnometer, a plurality of LED of described LED display column are divided into many groups with different colours, correspond respectively to different gas concentration lwevel scopes.For example, a plurality of LED of described LED display column are divided into green, yellow, red three groups, correspond respectively to lower, general, than a Senior Three gas concentration lwevel scope.

Above-mentioned capnometer also is provided with corresponding to a plurality of shapes of face of different gas concentration lwevel scopes or animal pilot lamp, and is luminous by described treatment circuit driving.Above-mentioned capnometer also is provided with the optical sensor of sensitive context luminance brightness with the brightness of regulating described LED display column.

In the above-mentioned capnometer, described housing is square, and the bottom is provided with a plurality of legs, and described LED display column stretches out from the front end face of housing, and is provided with the LED display column face shield that LED light is distributed to all directions.

In the above-mentioned capnometer, described housing is three pyramids, and the bottom is provided with a plurality of legs, and is equipped with described LED display column on each face of housing.

In the above-mentioned capnometer, described housing dorsal part be provided with the hook that is used to hang described capnometer and/or with the suitable plug of wall outlet.

Above-mentioned capnometer also is provided with and the suitable plug of vehicle-mounted lighter socket, is connected with described housing by flexible connecting member.

In the above-mentioned capnometer, at the described carbon dioxide sensor in housing bottom with install between the opening of described carbon dioxide sensor and also be provided with the silica gel seat suitable with the air sample container mouth.

Implement capnometer of the present utility model, have following beneficial effect: capnometer of the present utility model with gas concentration lwevel be divided into a plurality of scopes and and then be subdivided into a plurality of level, LED lamp group by different colours reflects the residing rough range of the gas concentration lwevel that monitors, and specifically reflect the gas concentration lwevel level that monitors by the height of the bright lamp of LED on the LED post, easy and be easy to identification, be particularly suitable for child and use.Carbon dioxide sensor upside-down mounting of the present utility model can reduce dust accretions this transducer sensitivity is impacted in the bottom of this monitor, and can avoid influencing because of the carbon dioxide that human body is breathed out the monitoring result of this monitor.In addition, capnometer of the present utility model is easy to adjustment, and the user only needs have the air sample container of normal concentration carbon dioxide to insert in this monitor collection, just can regulate, and is simple to operation.

Description of drawings

Figure 1A is the side view of the utility model capnometer first embodiment;

Figure 1B is the vertical view of the utility model capnometer first embodiment;

Fig. 2 A is the synoptic diagram of an example of display in the utility model capnometer;

Fig. 2 B is the synoptic diagram of another example of display in the utility model capnometer;

Fig. 2 C is the synoptic diagram of an example again of display in the utility model capnometer;

Fig. 3 A is the side view of second embodiment of the utility model capnometer;

Fig. 3 B is the vertical view of second embodiment of the utility model capnometer;

Fig. 4 A is the side view of the 3rd embodiment of the utility model capnometer;

Fig. 4 B is the front schematic view of the 3rd embodiment of the utility model capnometer;

Fig. 5 is the synoptic diagram of the 4th embodiment of the utility model capnometer;

Fig. 6 A is the vertical view of the 5th embodiment of the utility model capnometer;

Fig. 6 B is the side view of the 5th embodiment of the utility model capnometer;

Fig. 7 is the mounting structure synoptic diagram of carbon dioxide sensor among embodiment of the utility model;

Fig. 8 A is the synoptic diagram in conjunction with the air sample container of the 6th embodiment use of the utility model capnometer;

Fig. 8 B is the synoptic diagram in conjunction with the air sample bag of capnometer use of the present utility model;

Fig. 9 is the logic diagram of circuit of an embodiment of the utility model capnometer;

Figure 10 is the circuit diagram of the treatment circuit among Fig. 9;

Figure 11 is the circuit diagram of LED display column among Fig. 9.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples:

Shown in Figure 1A and Figure 1B, be respectively side view and the vertical view of the utility model capnometer first embodiment.This capnometer is a common table top type capnometer, mainly is made of at the carbon dioxide sensor 13 of housing 11 bottoms and the treatment circuit (not shown) in the housing square housing 11, the LED display column 12, the upside-down mounting that are arranged on housing 11 front end faces.The outside of LED display column 12 also is provided with face shield 14, is used for the light that LED sends is distributed to all directions, to realize maximum visible angle.Shown in Figure 1A, the bottom of housing 11 is provided with a plurality of legs 15, so that in housing 11 bottoms with place and form a determining deviation between the surfaces such as desktop of this monitor.Like this, the carbon dioxide sensor 13 of upside-down mounting in housing 11 bottoms just has enough spaces to be exposed in the air and don't can be subjected to the influence of the direct gas flows such as carbon dioxide that human body breathes out.In addition, carbon dioxide sensor 13 is arranged on the housing bottom, can also reduces the negative effect of the accumulation of dust this transducer sensitivity.

The concrete installation of carbon dioxide sensor 13 as shown in Figure 7.These carbon dioxide sensor 13 upside-down mountings are below circuit board 24, and the cable that its primary voltage output pin 27 is with insulation course 15 by the outside is connected to the input pin 28 of the impedance transformer 81 in the treatment circuit.Be provided with certain air gap 26 between the output pin 27 of circuit board 24 and carbon dioxide sensor and the input pin 28 of impedance transformer 81.Such structure can minimize the drift error of sensor output voltage.

Among each embodiment of the utility model capnometer, the display that is used to show gas concentration lwevel can adopt various LED intuitively display column form, is wherein several examples as Fig. 2 A-2C.Among Fig. 2 A, LED display column 200 is made up of three groups of wrong folded LED 201,202,203, every group of corresponding gas concentration lwevel scope of LED, when the gas concentration lwevel that monitors rank of living in during corresponding to one of them LED, this LED with and to be lower than down all LED of this gas concentration lwevel level all luminous, form continuous light beam.For example among Fig. 2 A, first group of LED 201 organizes in LED any one if LED display column is luminous to this corresponding to higher gas concentration lwevel scope, represents that then current air quality is very poor; Second group of LED 202 organizes in LED any one as if luminous to this corresponding to general gas concentration lwevel scope, represents that then current air quality is general; The 3rd group of LED 203 if having only this group LED luminous, represents then that current air quality is fine corresponding to lower gas concentration lwevel scope, is beneficial to health.And, these three groups of LED can adopt the LED of three kinds of different colours, for example first group of LED 201 adopts red, second group of LED 202 adopts yellow, the 3rd group of LED 203 adopts green, luminous by the LED that observes different colours, can not get information about current gas concentration lwevel and air quality even if be not familiar with the child of numeral yet.LED display column 300 shown in Fig. 2 B and Fig. 2 category-A are seemingly, the LED of a plurality of overlappings represents different gas concentration lwevel levels respectively, just can probably learn current air quality by the height of observing LED post luminous in this LED display column 300, read the luminous LED of highest point and just can learn current gas concentration lwevel level.Shape of face pilot lamp 12 has more intuitively also been set up except being provided with LED display column 12 in the display part 400 of Fig. 2 C, is similar to the LED modules with different colors group that adopts among Fig. 2 A, and the different shapes of face among Fig. 2 C are corresponding to different gas concentration lwevel scopes.Perhaps, can also adopt the pilot lamp of the animal figures that more attracts child or be easier to discern.

Be respectively side view and the vertical view of second embodiment of the utility model capnometer as Fig. 3 A and Fig. 3 B.The capnometer of this embodiment is applicable to the many occasions of observation crowd such as meeting room.As shown in the figure, the housing 21 of this capnometer is three pyramids, and the center bottom upside-down mounting of housing 21 has carbon dioxide sensor 13.Equally, have enough spaces to be exposed in the air in order to guarantee carbon dioxide sensor 13, the bottom of housing 21 also is provided with a plurality of legs 15.In addition, foregoing LED display column 12 is installed all on each face of trihedral housing 21, thereby allows crowd on all directions all can observe the monitoring result of this monitor.

Be respectively side view and the front schematic view of the 3rd embodiment of the utility model capnometer as Fig. 4 A and Fig. 4 B.The 3rd embodiment is the wall type capnometer, can insert in the supply socket of installing on the wall by the plug 17 that is arranged on housing 31 dorsal parts and power.Can also be provided with the hook (not shown) on the dorsal part of this housing 31, so that monitor is suspended on the wall.Equally, carbon dioxide sensor 13 upside-down mountings are in the bottom of housing 31, and this set also helps the calibration operation to this monitor, about this point, follow-uply will provide introduction.For more eye-catching demonstration monitoring result, this capnometer has adopted the display part shown in Fig. 2 C, promptly both be provided with LED display column 12 and indicated current concrete gas concentration lwevel level, also be provided with the rough range of the current gas concentration lwevel of three shape of face pilot lamp, 16 reflections.Wall type capnometer shown in Fig. 4 A and Fig. 4 B more is applicable in the environment such as kindergarten, children room, uphangs and can avoid child to touch on wall, can clearly demonstrate the gas concentration lwevel that monitors again simultaneously.In addition, the top of this wall type capnometer also can be provided with optical sensor 18, is used for the luminance brightness of sensing surrounding environment, thereby LED display column 12 and shape of face pilot lamp 16 are adjusted to suitable brightness.

Fig. 5 is the synoptic diagram of the 4th embodiment of the utility model capnometer.The 4th embodiment is the capnometer that is suitable for use in the car, and as shown in the figure, LED display column 12 is arranged on the front end of housing 41, and is provided with the plug 20 suitable with vehicle-mounted lighter socket, is installed in housing 41 rear ends by flexible connecting member 19.For example, this flexible connecting member 16 can be the sebific duct of collapsible bending, and the driver can be adjusted to LED display column 12 position that is suitable for observing by this sebific duct of stretch bending.

Be respectively vertical view and the side view of the 5th embodiment of the utility model capnometer as Fig. 6 A and Fig. 6 B.The 5th embodiment is the hand-held capnometer, and shown in Fig. 6 B, for the carbon dioxide that the user breathed out that prevents hand-held this monitor influences the monitoring result of this monitor, carbon dioxide sensor 13 is installed in the bottom of housing 51 equally.In addition a plurality of legs can be set on the bottom of housing 51, so that after this monitor is placed on desktop, can also operate as normal.Shown in Fig. 6 B, at carbon dioxide sensor 13 with install between the opening 22 of this carbon dioxide sensor 13 and also be provided with silica gel seat 23, this silica gel seat 23 has certain elasticity, and its inwall is formed with pit.When this monitor is calibrated, shown in Fig. 8 A, the air sample container 33 that the normal concentration carbon dioxide is housed can be inserted in this silica gel seat 23.Container mouth 32 on the container 33 is suitable with this silica gel seat 23, and the projection outside it embeds in the pit of silica gel seat 23, thereby realizes sealing, carbon dioxide sensor 13 is fully contacted contain the air of normal concentration carbon dioxide, so that calibrate.Shown in Fig. 8 A, container 33 can have dismountable top, is connected with container body by existing various web members.More convenient in order to carry and to gather, can also use the air sample bag 36 shown in Fig. 8 B to gather normal concentration or air to be detected, insert in the silica gel seat 23 of capnometer by the container mouth 32 that is provided with on the air sample bag then.This air sample bag 36 can be by being similar to silica gel seat 23 lid 38 sealings of structure.The user can use this air sample container 33 or air sample bag 36 that different local air are fetched, and inserts the monitoring of carrying out gas concentration lwevel in it in the silica gel sheath 23 of monitor then.

Introduce the circuit of an embodiment of the utility model capnometer realizes below with reference to Fig. 9-11.As shown in Figure 9, the signal of 80 pairs of carbon dioxide sensors of treatment circuit, 13 outputs is changed, and luminous according to the LED in the signal driving LED display column 12 after the conversion.Treatment circuit specifically comprises impedance transformer 81, measuring amplifier 82, gain amplifier 83, calibration circuit 84 and voltage regulator circuit 85.Voltage regulator circuit 85 stabilizes to the 9V dc voltage of input+5V, and supplies with the various piece of this capnometer.The original output voltage U S0 of 81 pairs of carbon dioxide sensors of impedance transformer carries out conversion, reduces its impedance, thereby output voltage U S gives measuring amplifier 82.Measuring amplifier 82 amplifies voltage U S, and it is carried out linearization, and output voltage U R41 gives gain amplifier 83.Then, gain amplifier 83 amplifies this voltage U R41, obtains output voltage U CO2.This output voltage U CO2 is just proportional with the concentration of tested Carbon Dioxide in Air, and promptly the output voltage U CO2 of 1mV is corresponding to the gas concentration lwevel of 1ppm.At last, a plurality of LED of correspondence are luminous in the output voltage U CO2 driving LED display column.Calibration circuit 84 is used to calibrate this capnometer, and its output voltage U CO2 when regulating the gas concentration lwevel of 400ppm realizes calibrating for error.As shown in figure 10, be provided with two regulators in the calibration circuit 84, resistance R 22 is used to carry out coarse adjustment by factory, and resistance R 23 is used to carry out accurate adjustment by the user.

The circuit of LED display column specifically as shown in figure 11, this LED display column is made up of 20 LED, the corresponding concrete gas concentration lwevel level of each LED.And among these 20 LED, first group of LED is that DR14-DR20 takes on a red color, and second group of LED is that DY10-DY13 is yellow, and the 3rd group of LED is that DG1-DG9 is green, is similar to the setting among Fig. 2 A.By setting in advance, first group of red LED is corresponding to higher gas concentration lwevel level, that is air quality is very poor; Second group of yellow led is corresponding to general gas concentration lwevel level, that is air quality is general; The 3rd group of green LED is corresponding to lower gas concentration lwevel level, that is air quality is fine.Under the driving of the output voltage U CO2 of gain amplifier 83, corresponding to the LED of the represented gas concentration lwevel of this output voltage U CO2 with and corresponding down gas concentration lwevel to be lower than all LED of the represented gas concentration lwevel of this UCO2 all luminous.By reading the emitting led pairing gas concentration lwevel level of highest point on the emitting led post, just can know current air quality; Simultaneously, observe all just in the color of luminous LED, also the current air quality of judgement that can be rough.

Claims

1. a capnometer is characterized in that, described capnometer comprises housing, carbon dioxide sensor, treatment circuit and LED display column; Described carbon dioxide sensor upside-down mounting is in the opening of housing bottom; Described LED display column comprises a plurality of LED, wherein the corresponding certain gas concentration lwevel level of each LED; The signal that described treatment circuit conversion carbon dioxide sensor monitors also drives the LED of corresponding gas concentration lwevel level in the described LED display column and is lower than all LED of described gas concentration lwevel level luminous according to the signal after the conversion.

2. capnometer according to claim 1 is characterized in that, a plurality of LED of described LED display column are divided into many groups with different colours, correspond respectively to different gas concentration lwevel scopes.

3. capnometer according to claim 2 is characterized in that, a plurality of LED of described LED display column are divided into green, yellow, red three groups, correspond respectively to lower, general, than a Senior Three gas concentration lwevel scope.

4. capnometer according to claim 1 is characterized in that, described capnometer also is provided with corresponding to a plurality of shapes of face of different gas concentration lwevel scopes or animal pilot lamp, and is luminous by described treatment circuit driving.

5. capnometer according to claim 1 is characterized in that, described capnometer also is provided with the optical sensor of sensitive context luminance brightness with the brightness of regulating described LED display column.

6. capnometer according to claim 1, it is characterized in that the housing of described capnometer is square, the bottom is provided with a plurality of legs, described LED display column stretches out from the front end face of housing, and is provided with the LED display column face shield that LED light is distributed to all directions.

7. capnometer according to claim 1 is characterized in that, the housing of described capnometer is three pyramids, and the bottom is provided with a plurality of legs, and is equipped with described LED display column on each face of housing.

8. capnometer according to claim 1 is characterized in that, the housing dorsal part of described capnometer be provided with the hook that is used to hang described capnometer and/or with the suitable plug of wall outlet.

9. capnometer according to claim 1 is characterized in that, described capnometer also is provided with and the suitable plug of vehicle-mounted lighter socket, is connected with described housing by flexible connecting member.

10. capnometer according to claim 1 is characterized in that, at the described carbon dioxide sensor in housing bottom with install between the opening of described carbon dioxide sensor and also be provided with the silica gel seat suitable with the air sample container mouth.