TWM545906U - Flow rate detection device of air sampling detector - Google Patents

Description

Air sampling detector flow rate detecting device

This creation relates to an air sampling detector, and more particularly to a flow rate detecting device for an air sampling detector.

Press, the air sampling detector is generally a device that detects or monitors the concentration change of a particular substance or component in the air of a protected area, and when the content of the substance or component exceeds a certain value, An air sampling detector can alert you, such as an Air Sampling Smoke Detector (Aspirating Smoke Detector, or ASD) for carbon monoxide detection or a carbon monoxide detection for prevention of poisoning. And the like, as shown in the first figure, is a conventional air sampling detector which draws an air sample of the area to be monitored to the air sampling detector by means of a fan 13 disposed in the sampling line 11. The air detector 14 detects the air detector, and when the air sample is abnormal, the main circuit board 15 of the air sampling detector can send a control signal to the alarm device 16, and the alarm device 16 issues an alarm. Messages such as warning lights or sounds.

Please continue to refer to the first figure, the existing air sampling detector also has a flow sensor 12 (or flow meter) in the sampling line 11 to distinguish according to the sensing principle of operation. The flow sensor 12 may specifically be a thermal mass flow meter or an ultrasonic flow meter, and the flow sensor 12 is configured to detect and monitor the flow of the air sample in the sampling line 11 . 俾When the flow rate of the air sample is too low, it may indicate that the sampling line 11 is abnormal, such as cracking or clogging, which will affect the normal operation of the air sampling detector, so the alarm device 16 can also issue an alarm at this time. a message to remind the relevant personnel to check the state of the sampling line 11, however, regardless of the form of the flow sensor 12, for the existing air sampling detector, it is a component that requires additional settings, so The overall structure of the air sampling detector is complicated and the production cost thereof is increased; in addition, the thermal mass flow meter has a problem that it is easily affected by the (gas) temperature; in addition, the above-mentioned conventional flow meter has the same Most of the sensed physical quantity and flow value have a nonlinear saturation effect, which leads to limitations in the range of values and accuracy of detection.

In addition, the Chinese Patent Publication No. CN103452887A "Flow Detection Sensor and Smoke Purification Filter System with the Sensor" discloses a flow detection sensor composed of a flow fan and a Hall element for detecting the number of revolutions of the flow fan. And through the flow detection sensor to check whether the filter in the smoke purification filter system is blocked and should be replaced, however, the flow fan itself cannot be externally supplied with power, and thus cannot actively rotate. The flow detection sensor alone is only a kind of Knowing anemometers, in engineering applications, it must be equipped with another fan (or fan) that can actively rotate to perform the detection function. As a result, the product as a whole still has the problem of complicated structure and high cost; When the flow rate detected by the flow detection sensor is too low, there will be problems in that it is impossible to determine whether the pipeline is abnormal (for the air sampling detector), the filter plug (for the smoke purification filter system) or the failure of the fan itself. , therefore, how to improve the above-mentioned deficiencies, that is, the applicant for this case To solve the difficult technical point lies.

In view of the above-mentioned shortcomings of conventional air sampling detectors, the purpose of this creation is to develop an air sampling detector that simplifies the structure and reduces manufacturing costs.

Another purpose of this creation is to develop an air sampling detector that can effectively resolve pipeline anomalies and fan anomalies.

In order to achieve the above objective, the present invention provides a flow rate detecting device for an air sampling detector, comprising: a sampling line; an air detector having the same inlet and the same outlet, the sample inlet and the sampling line Connected to an air pump, connected to the sampling pipeline, the air pump has a speed output end; a main control circuit board, the main control circuit board is provided with a controller, and the controller and the air detector respectively And the speed output end of the air pump is electrically connected, the controller is provided with a comparison module and a storage module, wherein the storage module stores a normal speed representing the speed of the pump pump under the normal state of the sampling pipeline a value; wherein the controller immediately receives a speed signal outputted from the speed output end of the air pump and converts the speed signal into a speed value, and the comparison module compares the speed value with the normal speed value. And when the difference between the two exceeds a predetermined ratio range or value, the controller sends a control signal to the outside.

Wherein, the air pump is a 3PIN or 4PIN type air pump.

Wherein, the air pump is a fan, a blower or an air pump.

The method further includes an output device electrically connected to the controller.

In addition, the present invention also provides a flow rate detecting device for an air sampling detector, comprising: a sampling pipeline; an air detector having the same inlet and the same outlet, the sample inlet being connected to the sampling pipeline; An air pump connected to the sampling line; a speed a detection circuit electrically connected to the air pump; a main control circuit board, the main control circuit board is provided with a controller, and the controller is electrically connected to the air detector and the rotation speed detecting circuit respectively, the controller a comparison module and a storage module are disposed therein, wherein the storage module stores a normal rotation speed value representing the speed of the pumping pump in the normal state; wherein the controller immediately receives a response from the rotation speed Measuring the speed signal output by the circuit and converting the speed signal into a speed value, the comparison module comparing the speed value with the normal speed value, and when the difference between the two exceeds a predetermined ratio range or value Let the controller send a control signal to the outside.

Wherein, the air pump is a 2PIN type air pump.

Wherein, the air pump is a fan, a blower or an air pump.

The method further includes an output device electrically connected to the controller.

Therefore, the air pump of the present invention can simultaneously function as both an air suction fan and a flow meter, unlike the conventional air sampling detector, which requires an additional type of flow meter, and only needs a single air pump. The flow detection is completed, which can greatly simplify the overall structure and reduce the production cost.

[Use]

11‧‧‧Sampling line

12‧‧‧Flow Sensor

13‧‧‧Fan

14‧‧‧Air Detector

15‧‧‧Master Control Board

16‧‧‧Announcement device

[this creation]

2‧‧‧Sampling line

3‧‧‧Air pump

31‧‧‧Power connection

32‧‧‧Speed output

4‧‧‧Air Detector

41‧‧‧ sample entrance

42‧‧‧ Sample export

5‧‧‧Master control board

51‧‧‧ Controller

511‧‧‧ Alignment module

512‧‧‧ storage module

6‧‧‧Speed detection circuit

7‧‧‧Output device

The first picture is a schematic diagram of the structure of a conventional air sampling detector.

The second figure is a schematic structural view of an embodiment of the present creation.

The third figure is a schematic structural view of the second embodiment of the present creation.

The fourth figure is a schematic diagram of the action before an embodiment of the present creation.

The fifth figure is a schematic diagram of the action of one embodiment of the present creation.

Referring to the second figure, which is an embodiment of the present air sampling detector, comprising: a sampling line 2 for connecting to an area to be monitored to obtain air from the area or space. a sample, here the connection may be a direct connection, ie the sampling line 2 itself extends integrally into the region, or the connection may also be an indirect connection, ie an external sampling is connected by the sampling line 2 a pipeline (such as a soft plastic pipeline, not shown), and then extending the sampling pipeline to the area; an air detector 4, the air detector 4 is connected to the sampling pipeline 2 for receiving and judging the Whether the air sample is abnormal, the air detector 4 has the same inlet 41 and the same outlet 42. The sample inlet 41 is connected to the sampling line 2, taking an air sampling smoke detector (ASD) as an example. 4 generally includes a light-emitting element and a light-receiving element (or light-detecting element), which utilizes the principle that the concentration of the smoke affects the light-receiving element to receive the light-emitting element signal for smoke concentration monitoring, but the air probe The detailed structure and the operation principle inside the device 4 are all common knowledge in the art and are not in the present invention, so it will not be described in detail here; an air pump 3, the air pump 3 is connected to the sampling line 2, Providing auxiliary power for pumping the air sample from the area to be monitored to the inside of the air detector 4 for detecting. The air pump 3 specifically includes a fan, a blower or other various types of pumping pumps, and the pumping pump 3 is provided. There is a power connection portion 31 for connecting an external power source to obtain the power required for the operation of the air pump 3, the power connection portion 31 generally has positive and negative ends, and the air pump 3 is provided with a speed output terminal 32. For outputting a speed signal representing the rotation speed of the air pump 3, according to the type of the existing air pump 3, there are roughly several types of 2PIN, 3PIN and 4PIN, among which 3PIN is pumped. The pump 3 has a tachometer signal output line in addition to the power supply positive terminal for connecting the external power supply and the ground wire (GND, that is, the negative terminal of the power supply), and the 4PIN air pump 3 Further, a PWM (Pulse Width Modulation) speed control line can be used to receive an external PWM control signal to change the rotation speed of the air pump 3. Thus, the conventional 3PIN or 4PIN type can be seen. The air pump 3 has the power connection portion 31 and the speed output end 32 required for the present invention. Therefore, the air pump 3 shown in the second embodiment can be pumped by a conventional 3PIN or 4PIN. Air pump products (such as fans) to achieve; in addition, if the existing 2PIN pump product, because it only has the positive and negative ends of the power supply (that is, it only implements the power connection 31 of the creation, but not With the ready-made speed output terminal 32), in this case, please refer to the second embodiment of the present invention as shown in the third figure, which is applicable to the conventional 2PIN air pump product, wherein the speed detection can be further included. Circuit 6, and the speed detection The circuit 6 is connected to the air pump 3 for detecting and outputting a speed signal representing the speed of the air pump 3. Here, the speed detecting circuit 6 can use a commercially available fan speed detecting chip, such as Lianyang. The semiconductor IT8712F chip, in this way, the creation can also be achieved with a 2PIN fan product, thereby making the creation of the product not limited to the hardware conditions of different types of fan products, thereby expanding the scope of application; In addition, since the remaining components of the second embodiment of the present invention can be said to be the same as the first embodiment, the structure and the operation principle of the present invention will be mainly described by taking the first embodiment and the second figure as representative examples. a main control circuit board 5, the main control circuit board 5 is provided with a controller 51 such as a microcontroller (Microcontroller Unit (MCU) 51, the controller 51 and the air pump 3, its speed output end 32 and air detector 4 In addition, please refer to the third figure. For the 2PIN pump 3, the controller 51 is electrically connected to the rotation speed detecting circuit 6, and the controller 51 is provided. a comparison module 511 and a storage module 512; an output device 7, the output device 7 is electrically connected to the controller 51 of the main control circuit board 5, and the output device 7 may be a display device such as a screen or a display. The output device 7 can also be an alarm device such as a horn or a warning light.

The following is a brief description of the working principle and beneficial effects of this creation: please refer to the second and fourth figures. When the creation is first installed in the area to be monitored, the sampling line 2 is normal and undamaged at this time. The operator can start the air pump 3, and at this time, the speed output end 32 of the air pump 3 can output and transmit a control indicating that the normal speed signal in the sampling line 2 is normal to the main control board 5. The controller 51 can convert the normal speed signal into a normal speed value. For example, the converted normal speed value is 10000 rpm, indicating that the pump 3 can rotate up to 10,000 revolutions per minute when the sampling line 2 is normal. The controller 51 can further transmit the normal speed value to the storage module 512 for storage. Here, the normal speed value is a reference value for evaluating whether the air sample flow rate in the sampling line 2 is abnormal. Next, please refer to the fifth figure, when the sampling line 2 is abnormal, such as rupture or blockage, at this time, the rotational speed signal outputted by the rotational speed output end 32 of the air pump 3 has its rotational speed value. However, the pipe clogging is taken as an example. At this time, the rotation speed of the fan 3 is usually reduced, for example, only 7900 rpm is left. Therefore, the comparison module 511 of the controller 51 can be obtained from the storage module 512. The stored normal speed value is 10000 rpm, and the normal speed value is compared with the measured speed value when the pipeline is blocked, if the difference between the two exceeds a predetermined proportional range or value (for example, the difference) Exceeding more than 20% of the normal speed value, in this example, 10000-7900=2100, which has exceeded 20% of 10000 (ie 2000), the predetermined ratio range or value can be determined by user or detection sensitivity, etc. The actual demand changes and changes), at this time the controller 51 can transmit a control signal to the output The device 7 causes the output device 7 to generate a corresponding message, such as displaying the abnormal speed value or the corresponding fault light number or sounding an alarm sound, etc., thereby reminding the relevant personnel to go to the inspection sampling line 2 status. Here, it is worth mentioning that when the creation is installed in different monitored areas, it may be necessary to adjust the hardware size and length of the pipeline (such as the size of the space, the pressure state, etc.), and adjust the size and length of the pipeline and other hardware parameters. In this way, even if the supply voltage of the air pump 3 is fixed, the actual normal speed value will be different according to the actual site environment and installation conditions, and cannot be generalized. Therefore, the creation uses the field and Real-time (instant) detection to generate the normal speed value instead of pre-setting a common value will improve the adaptability of the product to different application environments, thereby improving the reliability and detection accuracy of abnormal alarms. .

Referring to the second figure, when the sampling line 2 is in a normal state, the rotation speed of the air pump 3 can affect the flow rate of the air sample. If the sampling line 2 is abnormal, such as cracking or clogging, the air sample is caused. The flow rate change will in turn affect the rotation speed of the air pump 3 in the active rotation. By using the foregoing characteristics and principles, by instantaneously detecting the rotation speed of the air pump 3, the present invention substantially realizes the use of the air pump 3 as a flow meter to detect The purpose of monitoring the state of the sampling line 2, that is, the air pump 3 can simultaneously have the functions of the original air suction fan and the additional flow meter, so that the creation is not like the conventional air sampling detection. The device needs to be additionally provided with other types of flow meters, and only a single pump 3 can be used to complete the flow detection, thereby achieving the effect of greatly simplifying the overall structure and reducing the production cost; in addition, due to the failure of the pump 3 The rotation speed is 0, so there is still a significant difference between the rotation speed of the air pump 3 caused by the abnormality of the sampling line 2, so the creation can still effectively distinguish the abnormality of the pipeline or the abnormality of the air pump 3, And may have the better practicability.

2‧‧‧Sampling line

3‧‧‧Air pump

31‧‧‧Power connection

32‧‧‧Speed output

4‧‧‧Air Detector

41‧‧‧ sample entrance

42‧‧‧ Sample export

5‧‧‧Master control board

51‧‧‧ Controller

511‧‧‧ Alignment module

512‧‧‧ storage module

7‧‧‧Output device

Claims (8)

A flow rate detecting device for an air sampling detector, comprising: a sampling pipeline; an air detector having the same inlet and the same outlet, the sample inlet being connected to the sampling pipeline; an air pump, and the sampling The pipeline is connected, the pump has a speed output end; a main control circuit board, the main control circuit board is provided with a controller, and the controller is electrically connected to the air detector and the air pump output end thereof respectively The controller is provided with a comparison module and a storage module, wherein the storage module stores a normal rotation speed value representing the speed of the pumping pump in the normal state; wherein the controller receives an instant The speed signal outputted from the speed output end of the air pump is converted into a speed value, and the comparison module compares the speed value with the normal speed value, and the difference between the two exceeds a predetermined value. The proportional range or value of the controller causes the controller to issue a control signal to the outside. The flow rate detecting device of the air sampling detector according to claim 1, wherein the air pump is a 3PIN or 4PIN type air pump. The flow rate detecting device of the air sampling detector according to claim 1, wherein the air pump is a fan, a blower or an air pump. The flow rate detecting device of the air sampling detector of claim 1, further comprising an output device electrically connected to the controller. A flow rate detecting device for an air sampling detector, comprising: a sampling pipeline; an air detector having the same inlet and the same outlet, the sample inlet being connected to the sampling pipeline; an air pump, and the sampling a pipeline connection; a rotation speed detecting circuit electrically connected to the air pump; a main control circuit board, the main control circuit board is provided with a controller, the controller and the air detector and the rotation speed detecting circuit respectively Electrically connected, the controller is provided with a comparison module and a storage module, wherein the storage module stores a normal rotation speed value representing the speed of the pumping pump in the normal state; wherein the controller Instantly receiving a speed signal outputted from the speed detecting circuit and converting the speed signal into a speed value, the comparison module compares the speed value with the normal speed value, and the difference between the two exceeds one The predetermined proportional range or value causes the controller to issue a control signal to the outside. The flow rate detecting device of the air sampling detector according to claim 5, wherein the air pump is a 2PIN type air pump. The flow rate detecting device of the air sampling detector according to claim 5, wherein the air pump is a fan, a blower or an air pump. The flow rate detecting device of the air sampling detector of claim 5, further comprising an output device electrically connected to the controller.