CN213237839U

CN213237839U - Air detection control device

Info

Publication number: CN213237839U
Application number: CN202022066803.0U
Authority: CN
Inventors: 郭莉莉; 黄川�
Original assignee: SHANGHAI HONGPU STEEL STRUCTURE ENGINEERING CO LTD
Current assignee: SHANGHAI HONGPU STEEL STRUCTURE ENGINEERING CO LTD
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2021-05-18
Anticipated expiration: 2030-09-18

Abstract

The application relates to an air detection control device, which comprises a first ventilating duct, a first fan, a second ventilating duct and a second fan; the first ventilation pipeline comprises a main pipeline and a plurality of branch pipelines communicated with the main pipeline, the horizontal heights of the ports of the branch pipelines are different, the first fan is arranged in the main pipeline, and a sensor P for detecting the air quality is also arranged in the main pipeline; the second ventilation pipeline is communicated with the indoor space and the outdoor space, and the second fan is arranged in the second ventilation pipeline; the control circuit is used for controlling the start and stop of the second fan; the caliber of the second ventilation pipeline is larger than that of the first ventilation pipeline, and the power of the second fan is larger than that of the first fan. This application makes ventilation equipment have corresponding effect of opening and closing to the environment in workshop.

Description

Air detection control device

Technical Field

The application relates to the technical field of gas detection, in particular to an air detection control device.

Background

In the production process of some steel body structures, can often use some welding equipment such as electrogas welding, such equipment can produce a large amount of harmful gas at practical in-process, because the space of this type of workshop is great, has good multilayer production platform even, and harmful gas can be pervaded in the workshop, and the staff can't notice, leads to making staff's healthy to receive harm.

The solution of the related art is that the air in the production workshop is purified by some special air purification devices, or the indoor and outdoor air flows by fans, and the devices are always in working state no matter the quality of the air in the production workshop, which wastes the power resources; or when the workers cannot tolerate the suction of harmful gas, the related equipment is started, the physical health of the workers is damaged, and the air quality control effect in the workshop needs to be improved.

SUMMERY OF THE UTILITY MODEL

In order to enable the air purification equipment to open and close the environment of the workshop in a targeted manner, the application provides an air detection control device.

The application provides an empty gas detection surveys controlling means adopts following technical scheme:

an air detection control device comprises a first ventilating duct, a first fan, a second ventilating duct and a second fan; the first pipeline comprises a main pipeline and a plurality of branch pipelines communicated with the main pipeline, the horizontal heights of the ports of the branch pipelines are different, the first fan is arranged in the main pipeline, and a sensor P for detecting the air quality is also arranged in the main pipeline; the second pipeline is communicated with the indoor space and the outdoor space, and the second fan is arranged in the second pipeline; the fan control circuit is used for controlling the second fan to start and stop.

Through adopting above-mentioned technical scheme, first fan lasts the operation, can follow the air sample of gathering different level in first air pipe's the lateral conduit, makes the air of gathering through the sensor P of the detection air quality in the trunk line, detects out whether there is harmful gas in indoor air through sensor P, if there is harmful gas then sensor P output electric signal to control circuit to the realization is to the automatic control of second fan.

Optionally, the aperture of the second pipeline is larger than the aperture of the first pipeline, and the power of the second fan is larger than the power of the first fan.

By adopting the technical scheme, the larger indoor space can be collected by the first fan with smaller power, so that the sensor P can detect the space conveniently, namely, the air collection of the larger space is realized by the first fan with smaller electric energy consumption; the air in the workshop can be discharged and rotated by the aid of the high power of the second fan, and the air in the workshop can be kept clean.

Optionally, the control circuit includes:

and the positive input end of the comparison unit is connected to the signal output end of the sensor P, the negative input end of the comparison unit is connected with the reference voltage, the comparison unit is compared with the voltage analog signal output by the sensor P, and a high-level or low-level signal is output according to the comparison result.

And the control end of the switch unit is connected to the output end of the comparison unit and is used for switching on and switching off the second fan corresponding to the high-level signal output by the comparison unit.

By adopting the technical scheme, the comparison unit is arranged, so that the analog voltage signal output by the sensor P can be compared with the reference voltage, when the voltage signal value output by the sensor P is lower than the reference voltage signal value, no harmful gas or trace harmful gas exists, the comparison unit outputs a low level signal, and the switch unit and the second fan do not act; when the voltage signal value output by the sensor P is higher than the reference voltage signal value, namely a certain amount of harmful gas exists, the comparison unit outputs a high level signal, the switch unit acts, and the second fan is connected to the mains supply, so that the second fan operates to alternately discharge air in a workshop.

Optionally, the comparison unit includes an LM339 chip, a positive input end of the LM339 chip is connected to the signal output end of the sensor P, a negative input end of the LM339 chip is connected to the reference voltage, and a signal output end of the LM339 chip is connected to the control end of the switch unit.

By adopting the technical scheme, the four comparators are integrated in the LM339 chip, the comparison function of the output signal of the sensor P and the reference signal can be realized by utilizing one comparator, when the voltage signal of the forward input end of the comparator is higher than that of the reverse input end of the comparator, the corresponding output end of the comparator outputs a high level signal, otherwise, a low level signal is output, and the switch unit is controlled.

Optionally, the switch unit includes a triode V and an intermediate relay KA; the base electrode of the triode V is connected to the signal output end of the LM339 chip, the collector electrode of the triode V is connected to a power supply VCC through a coil of an intermediate relay KA which is connected in series, and the emitter electrode of the triode V is grounded through a current limiting resistor R; and a normally open contact of the intermediate relay KA is used for switching on and switching off the second fan.

By adopting the technical scheme, after the output end of the comparison unit outputs a high-level signal, the triode V is conducted, and the coil of the intermediate relay KA connected to the collector electrode of the triode V is electrified, so that the normally open contact of the intermediate relay KA acts and is closed, and the second fan and the mains supply are switched on to enable the second fan to alternate indoor air; after the output end of the comparison unit outputs a low level signal, the triode V is cut, and the intermediate relay KA and the second fan do not act, so that the second fan can be started in a targeted mode, the damage of harmful gas to the health of workers is effectively relieved, and meanwhile, the continuous waste of electric energy is reduced.

Optionally, the control circuit further includes an alarm unit connected to the output end of the switch unit, and configured to send an alarm signal.

By adopting the technical scheme, after the output end of the comparison unit outputs a high-level signal, the alarm circuit is switched on, and can send alarm information to prompt the relevant working personnel that harmful gas exists in the air, so that responsive protective measures are taken.

Optionally, the alarm unit includes a light emitting diode VD and a buzzer HA connected in parallel, one end of a parallel circuit formed by the alarm unit is connected to a power VCC through a normally open contact of an intermediate relay KA, and the other end is grounded.

By adopting the technical scheme, after the normally open contact of the intermediate relay KA is closed, the light-emitting diode VD and the buzzer HA can be communicated with the power supply VCC, and an acousto-optic signal is sent to remind relevant workers to take protective measures.

Optionally, a valve is arranged on the branch pipeline.

Through adopting above-mentioned technical scheme, the setting of valve, the work load that can be in the workshop is not high, or when personnel are not many, the accessible valve carries out the shutoff to the lateral conduit of corresponding height and closes, carries out air acquisition to the great high layer of personnel density, reduces the air that each lateral conduit gathered and to the dilution of the harmful gas of a certain height, improves the accuracy that detects.

In summary, the present application includes at least one of the following beneficial technical effects:

first fan lasts the operation, can follow the air sample of gathering different level in the lateral conduit of first air pipe, makes the air of gathering through the sensor P of the detection air quality in the trunk line, detects out whether there is harmful gas in indoor air through sensor P, if there is harmful gas then sensor P output electric signal to control circuit to the realization is to the automatic control of second fan.

Drawings

Fig. 1 is a schematic cross-sectional structure view of a first ventilation duct in an embodiment of the present application.

Fig. 2 is a schematic sectional structure view of the second ventilation duct in the embodiment of the present application.

Fig. 3 is a schematic diagram of a control circuit provided in an embodiment of the present application.

Description of reference numerals: 1. a first ventilation duct; 11. a first fan; 12. a main pipeline; 13. a branch pipe; 14. a valve; 2. a second vent conduit; 21. a second fan; 3. a control circuit; 31. a comparison unit; 32. a switch unit; 33. and an alarm unit.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses empty gas detection surveys controlling means. Referring to fig. 1 and 2, the air conditioner includes a first ventilation duct 1, a first fan 11, a second ventilation duct 2, a second fan 21, and a control circuit 3 for controlling the second fan 21 to start and stop.

The first ventilation pipe is arranged indoors and comprises a plurality of branch pipes 13 and a main pipe 12, and the branch pipes 13 are connected with one end part of the main pipe 12 and communicated with the main pipe 12; the ports of the branch pipes 13 departing from the main pipe 12 have different indoor horizontal heights, and one end part of the main pipe 12 departing from the branch pipes 13 is communicated to the outside. The first fan 11 is arranged in the main pipeline 12, and the wind direction of the first fan 11 faces outdoors. Be equipped with the sensor P who is used for detecting air quality in trunk line 12 for convert the harmful gas in the room air into analog voltage signal and export, the fan starts the air sample of accessible lateral conduit 13 indoor co-altitude of gathering, in order to realize making the air on co-altitude layer all can contact with sensor P through first ventilation pipe, reaches the concentration that detects harmful gas in the air of indoor co-altitude.

Preferably, the distances between adjacent branch pipes 13 are equal, so that the problem that air samples at different heights cannot be accurately collected due to too close or too large distance between any two branch pipes 13 can be reduced, and the uniformity of collecting indoor air can be improved.

Furthermore, each branch pipeline 13 is provided with a valve 14 for plugging or opening the branch pipeline 13, when the number of people in the room is small, the branch pipeline 13 with the corresponding height can be plugged and closed through the valve 14, air collection is carried out on a height layer with relatively large density of people, dilution of harmful gas at a certain height by the air collected by each branch pipeline 13 is reduced, and detection accuracy is improved.

The second pipeline is fixedly arranged indoors, the other port of the second pipeline is communicated to the outside, the caliber of the second pipeline is larger than that of the first pipeline, the second fan 21 is arranged in the second pipeline, the blown wind direction of the second fan 21 faces the outside, the power of the second fan 21 is larger than that of the first fan 11, and the second fan is used for exhausting indoor air to the outside.

Referring to fig. 3, the control circuit 3 includes a comparison unit 31 and a switching unit 32 connected to an output terminal of the comparison unit 31. The comparing unit 31 includes an LM339 chip, a positive input terminal of which is connected to the signal output terminal of the sensor P, and a negative input terminal of which is connected to the reference voltage, and is configured to compare the voltage output by the sensor P with the reference voltage, and when a voltage value of the positive input terminal is higher than the reference voltage, that is, after a concentration of harmful gas in the air is higher than a certain value, an output terminal of the LM339 chip outputs a high level signal, otherwise, a low level signal is output, and the output high level signal or the output low level signal is output to the switching unit 32.

The switching unit 32 includes an NPN-type transistor V and an intermediate relay KA, wherein a base of the transistor V is connected to the signal output terminal of the LM339, an emitter thereof is connected to the power VCC through a coil of the intermediate relay KA, and an emitter thereof is grounded through a current-limiting resistor R. The normally open contact of the intermediate relay KA is connected in series between the second fan 21 and the mains supply, and is used for connecting and disconnecting the second fan 21.

After the output end of the comparison unit 31 outputs a high level signal, the triode V is turned on, and the coil of the intermediate relay KA connected to the collector thereof is energized, so that the normally open contact of the intermediate relay KA is closed, and the power supply of the second fan 21 is switched on to enable the second fan 21 to alternate the indoor air, thereby realizing the discharge of harmful gases in the indoor air; after the output end of the comparing unit 31 outputs a low level signal, the triode V is cut, and the intermediate relay KA and the second fan 21 do not act, so that the second fan 21 can be started in a targeted manner, the damage of harmful gas to the health of workers is effectively reduced, and the continuous waste of electric energy is reduced.

In order to remind the working personnel after harmful gas appears in indoor air, the control circuit 3 further comprises an alarm unit 33, the alarm unit 33 comprises a light-emitting diode VD and a buzzer HA which are connected in parallel, one end part of a parallel circuit formed by the alarm unit 33 is connected to a power supply VCC through a normally open contact of an intermediate relay KA, and the other end of the parallel circuit is grounded.

The implementation principle of the embodiment of the application is as follows: the first fan 11 continuously operates, collects indoor air samples with different heights through branch pipelines 13 with different heights, detects whether harmful gas in the air exceeds the standard or not by using the sensor P, and realizes the function of comparing the sensor P with a reference voltage signal through a comparison unit 31 in the control circuit 3, wherein the concentration of the harmful gas in the air is high, the voltage signal output by the sensor P is high, otherwise, the voltage value output by the sensor P is low; when the voltage value signal output by the sensor P is greater than the reference voltage value, the comparing unit 31 outputs a high level signal to operate the switching unit 32, so that the second fan 21 is connected with the commercial power supply, and the second fan 21 with higher power discharges and replaces the air in the workshop; meanwhile, the switch unit 32 is connected with the alarm unit 33 to enable the alarm unit to emit sound and light signals to remind related workers of taking protective measures.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An empty gas detection surveys controlling means which characterized in that: comprises a first ventilation pipeline (1), a first fan (11), a second ventilation pipeline (2) and a second fan (21); the first ventilation pipeline (1) comprises a main pipeline (12) and a plurality of branch pipelines (13) communicated with the main pipeline (12), the horizontal heights of the ports of the branch pipelines (13) are different, the first fan (11) is arranged in the main pipeline (12), and a sensor P for detecting the air quality is also arranged in the main pipeline (12); the second ventilation pipeline (2) is communicated with the indoor space and the outdoor space, and the second fan (21) is arranged in the second ventilation pipeline (2); the fan control system further comprises a control circuit (3) for controlling the second fan (21) to start and stop.

2. An air detection control apparatus according to claim 1, characterized in that: the caliber of the second ventilation pipeline (2) is larger than that of the first ventilation pipeline (1), and the power of the second fan (21) is larger than that of the first fan (11).

3. An air detection control apparatus according to claim 1, characterized in that: the control circuit (3) comprises:

a comparison unit (31) having a forward input terminal connected to the signal output terminal of the sensor P and a reverse input terminal connected to a reference voltage, comparing the reference voltage with the voltage analog signal output from the sensor P, and outputting a high level or low level signal according to the comparison result;

and the control end of the switch unit (32) is connected to the output end of the comparison unit (31) and is used for switching on and switching off the second fan (21) corresponding to the high-level signal output by the comparison unit (31).

4. An air detection control apparatus according to claim 3, characterized in that: the comparison unit (31) comprises an LM339 chip, wherein the positive input end of the LM339 chip is connected to the signal output end of the sensor P, the negative input end of the LM339 chip is connected to the reference voltage, and the signal output end of the LM339 chip is connected to the control end of the switch unit (32).

5. An air detection control apparatus according to claim 4, wherein: the switch unit (32) comprises a triode V and an intermediate relay KA; the base electrode of the triode V is connected to the signal output end of the LM339 chip, the collector electrode of the triode V is connected to a power supply VCC through a coil of an intermediate relay KA which is connected in series, and the emitter electrode of the triode V is grounded through a current limiting resistor R; and a normally open contact of the intermediate relay KA is used for switching on and switching off the second fan (21).

6. An air detection control apparatus according to claim 3, characterized in that: the control circuit (3) further comprises an alarm unit (33) connected to the output of the switching unit (32) for emitting an alarm signal.

7. An air detection control apparatus according to claim 6, characterized in that: the alarm unit (33) comprises a light-emitting diode VD and a buzzer HA which are connected in parallel, one end part of a parallel circuit formed by the alarm unit is connected to a power supply VCC through a normally open contact of an intermediate relay KA, and the other end of the parallel circuit is grounded.

8. An air detection control apparatus according to claim 1, characterized in that: and a valve (14) is arranged on the branch pipeline (13).