CN202074941U - Window sensing system of fume hood - Google Patents
Window sensing system of fume hood Download PDFInfo
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- CN202074941U CN202074941U CN2011201799066U CN201120179906U CN202074941U CN 202074941 U CN202074941 U CN 202074941U CN 2011201799066 U CN2011201799066 U CN 2011201799066U CN 201120179906 U CN201120179906 U CN 201120179906U CN 202074941 U CN202074941 U CN 202074941U
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Abstract
The utility model provides a window sensing system of a fume hood. The window sensing system of the fume hood is characterized by including a window lower edge frame and a sliding groove on one side of the window which are mutually vertical, wherein the sliding groove includes an inner side fixing groove and an outer side sliding slot; a movable pulley with a magnet is arranged on the window lower edge frame; the movable pulley is matched with the outer side sliding slot; a window sensor is arranged in the inner side fixing groove; the window sensor includes a hall sensor, a parallel to serial chip and a microprocessor; the output end of the hall sensor is connected with a parallel port of the parallel to serial chip; a serial port of the parallel to serial chip is connected with an I/O port of the microprocessor; and the microprocessor is connected with a fume hood controller through the serial port. The fume hood window sensing system adopts the principle of hall effect, detects the height of the window of the fume hood, and transmits the information to the fume hood controller.
Description
Technical field
The utility model designs a kind of vent cabinet form sensor-based system, belongs to the ventilating system automation field.
Background technology
In biology, chemical laboratory; produce various humidities, stench, harmful gas and inflammable, explosive, corrosive substance during experimental implementation; in order to improve experimental situation; protection experimenter's safety; polluter in preventing to test spreads to the laboratory, and the laboratory generally all has been equipped with test vent cabinet system.In experimentation, because the Lift of form may change, the tradition ventilation cabinet can not in time be regulated according to the variation of form height, exhaust air rate, and hour vent cabinet face wind speed is excessive when form is opened, and causes the experiment operator discomfort; Vent cabinet face wind speed is too small when form is opened greatly, can not effectively discharge, and objectionable impurities is healthy to laboratory diffusion even harm experiment operator.
The utility model content
The technical problems to be solved in the utility model is: a kind of vent cabinet form sensor-based system is provided, can detects the height of vent cabinet form, and send information to fume hood controller.
The technical scheme that the utility model provides is: vent cabinet form sensor-based system is characterized in that: it comprises the sliding tray of mutually perpendicular form lower frame and form one side; Sliding tray comprises inboard pickup groove and outside chute; The form lower frame is provided with the movable pulley of carry magnet, movable pulley and outside chute phase configuration; In the described inboard pickup groove form sensor is set; The form sensor comprises hall sensor, parallel serial chip and the microprocessor of changeing, the output terminal of hall sensor is connected with the parallel parallel port that changes serial chip, the parallel serial port that changes serial chip is connected with the I/O port of microprocessor, and microprocessor is connected with fume hood controller by serial ports.
Press such scheme, described form sensor is arranged on the stripe board that equates with inboard pickup groove width, and wherein hall sensor vertically is distributed on the stripe board; The pin of hall sensor is along described movable pulley direction of motion setting and tangent with the magnetic line of force of described magnet.
Press such scheme, the distance between described magnet and the stripe board is less than 10mm.
Press such scheme, described magnet is flat pattern, comprises two flat horizontal surfaces, and one of them flat horizontal surface and described hall sensor are oppositely arranged; Distance is more than or equal to half of magnet height between the adjacent hall sensor, and is less than or equal to the magnet height.
Press such scheme, described magnet is patty, and diameter is 20mm, and the distance between the adjacent hall sensor is 20mm.
Principle of work of the present utility model is: when movable pulley slides up and down when driving form and open and close, the magnet on the movable pulley moves thereupon, close hall sensor surrounding magnetic field intensity change, make hall sensor do cutting magnetic line movement relatively.The hall sensor of making according to Hall effect is the work medium with magnetic field, changes the exercise parameter of object the form output of digital voltage into, makes it to possess the function of sensing and switch.When the magnitude of voltage that detects certain hall sensor when microprocessor becomes high level, can judge that the form lower frame slides into the height at this hall sensor place.
Because the scope that hall sensor can be responded to is very little, so the distance between the distance between the hall sensor and stripe board and the magnet all has certain requirement.
The I/O interface of microprocessor is not enough to receive the signal that so many hall sensor transmits, so the utility model adds parallel I/O number of pin of changeing serial chip with the expansion microprocessor.
The beneficial effects of the utility model are:
1, with the Hall effect is principle, detects the height of vent cabinet form, and send information to fume hood controller.
2, the hall sensor on the stripe board is vertically uniform, the pin of hall sensor is along described movable pulley direction of motion setting and tangent with the magnetic line of force of described magnet, make when magnet moves with movable pulley with the distance of close hall sensor keep constant, thereby guarantee the accuracy of form height detection.
3, by magnet is arranged to flat pattern, one of them flat horizontal surface and described hall sensor are oppositely arranged, distance is more than or equal to half of magnet height between the adjacent hall sensor, and be less than or equal to the magnet height, can allow 1 to 2 hall sensor obtain induction when adopting this hardware configuration to make magnet movement simultaneously, obtain the height of form lower frame again by the processing of microprocessor, this multiplex technique that utilization is adopted the hall sensing device, realized that N hall sensor detects 2N state, saved the quantity and the microprocessor I/O pin of hall sensor.
Description of drawings
Fig. 1 is the stereographic map of the utility model one embodiment.
Fig. 2 is the vertical view of the utility model one embodiment.
Fig. 3 is a form sensor circuit synoptic diagram.
Fig. 4 is the microprocessor program process flow diagram.
Embodiment
Fig. 1 is the stereographic map of the utility model one embodiment, and Fig. 2 is the vertical view of the utility model one embodiment, comprises the sliding tray 1 of mutually perpendicular form lower frame 3 and form one side; Sliding tray 1 comprises inboard pickup groove 1-1 and outside chute 1-2; Form lower frame 3 is provided with the movable pulley 4 of carry magnet 2, movable pulley 4 and outside chute 1-2 phase configuration; In the described inboard pickup groove 1-1 form sensor is set, the form sensor comprises hall sensor, parallel serial chip and the microprocessor of changeing, the form sensor is arranged on the stripe board 5 that equates with inboard pickup groove 1-1 width, wherein hall sensor vertically is distributed on the stripe board 5, and the pin of hall sensor is along described movable pulley direction of motion setting and tangent with the magnetic line of force of described magnet.
Magnet is preferably flat pattern, comprises two flat horizontal surfaces, and one of them flat horizontal surface and described hall sensor are oppositely arranged; Distance is more than or equal to half of magnet height between the adjacent hall sensor, and is less than or equal to the magnet height.Magnet 2 in the present embodiment is patty, and diameter is 20mm, and distance is 20mm between the adjacent hall sensor.
In order to obtain better inductive effects, the distance between magnet 2 and the stripe board 5 is less than 10mm.
Fig. 3 is a form sensor circuit synoptic diagram, and the output terminal of hall sensor is connected with the parallel parallel port that changes serial chip, and the parallel serial port that changes serial chip is connected with the I/O port of microprocessor, and microprocessor is connected with fume hood controller by serial ports.
In the present embodiment, hall sensor is 36, is respectively K1-K36, and the parallel serial chip that changes is selected the SN74LS165 chip for use, and microprocessor is selected the AT89S52 processor for use.8 parallel input pin p0-p7 of every SN74LS165 respectively with 36 hall sensors in 8 link to each other, by the cascade of 5 SN74LS165, AT89S52 have the last a slice SN74LS165 among the SN74LS165 of 4 I/O pins and 5 cascades cp1, cp2,
Four pins of q7 link to each other, and just 36 Continuity signals of 36 hall sensing devices can be become the data of serial, and the q7 pin by last a slice SN74LS165 sends on the I/O pin of AT89S52.
In the present embodiment, the form height slides in the height interval of 0mm-740mm.Software flow pattern as shown in Figure 4, microprocessor reads the binary value of SN74LS165 input, adopts Kalman filtering algorithm to carry out filtering and noise reduction, again the binary value after the denoising is scaled the form height value.Kalman filtering algorithm is a kind of estimation of recurrence, as long as promptly know and upward can calculate the estimated value of current state once the constantly estimated value of state and the observed reading of current state, so does not need the historical information of hourly observation or estimation.Kalman filtering algorithm and most of wave filter difference are that it is a kind of pure time domain filtering, and it does not need as frequency domain wave filters such as low-pass filters, need be transformed into time domain again in the frequency domain design and realize.Kalman filtering algorithm can be realized on microprocessor owing to above characteristic.
For example, when form slides into 80mm, magnet be in hall sensor K4 directly over, K4 produces induced current, and other hall sensor does not produce induced current, all these data are input among 5 SN74LS165, and the SN74LS165 of cascade will export the I/O pin of the serial data of " 000100000000000000000000000000000000 " to AT89S52 then.When form slided into 130mm, hall sensing device K6 and K7 produced induced current simultaneously, and corresponding SN74LS165 can export " 000001100000000000000000000000000000 " in AT89S52.Simultaneously, before form is stabilized to the height of 130mm, because machinery and operating personnel's shake, the height binary data can be in " 000001000000000000000000000000000000 ", beat between " 000001100000000000000000000000000000 " and " 000000100000000000000000000000000000 " three kinds of numerical value, be the height noise figure.The Kalman filtering algorithm module can by the preceding binary message that once measures and this measure binary message estimate height value after this denoising.The metric system numerical value that microprocessor can convert binary value to present form height is finished the measurement of form height.Microprocessor will be handled the back final data and be transferred to fume hood controller by the serial communication mode.
Claims (5)
1. vent cabinet form sensor-based system, it is characterized in that: it comprises the sliding tray of mutually perpendicular form lower frame and form one side; Sliding tray comprises inboard pickup groove and outside chute; The form lower frame is provided with the movable pulley of carry magnet, movable pulley and outside chute phase configuration; In the described inboard pickup groove form sensor is set; The form sensor comprises hall sensor, parallel serial chip and the microprocessor of changeing, the output terminal of hall sensor is connected with the parallel parallel port that changes serial chip, the parallel serial port that changes serial chip is connected with the I/O port of microprocessor, and microprocessor is connected with fume hood controller by serial ports.
2. vent cabinet form sensor-based system according to claim 1 is characterized in that: described form sensor is arranged on the stripe board that equates with inboard pickup groove width, and wherein hall sensor vertically is distributed on the stripe board; The pin of hall sensor is along described movable pulley direction of motion setting and tangent with the magnetic line of force of described magnet.
3. vent cabinet form sensor-based system according to claim 2, it is characterized in that: the distance between described magnet and the stripe board is less than 10mm.
4. according to any described vent cabinet form sensor-based system in claim 2 or 3, it is characterized in that: described magnet is flat pattern, comprises two flat horizontal surfaces, and one of them flat horizontal surface and described hall sensor are oppositely arranged; Distance is more than or equal to half of magnet height between the adjacent hall sensor, and is less than or equal to the magnet height.
5. according to any described vent cabinet form sensor-based system in the claim 4, it is characterized in that: described magnet is patty, and diameter is 20mm, and the distance between the adjacent hall sensor is 20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201799066U CN202074941U (en) | 2011-05-31 | 2011-05-31 | Window sensing system of fume hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201799066U CN202074941U (en) | 2011-05-31 | 2011-05-31 | Window sensing system of fume hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202074941U true CN202074941U (en) | 2011-12-14 |
Family
ID=45113041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201799066U Expired - Lifetime CN202074941U (en) | 2011-05-31 | 2011-05-31 | Window sensing system of fume hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202074941U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107552525A (en) * | 2017-10-17 | 2018-01-09 | 辽宁工程技术大学 | A kind of station autocontrol dust pelletizing system |
-
2011
- 2011-05-31 CN CN2011201799066U patent/CN202074941U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107552525A (en) * | 2017-10-17 | 2018-01-09 | 辽宁工程技术大学 | A kind of station autocontrol dust pelletizing system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 430070 Hubei province Wuhan Wuluo Road No. 717, Siu Fu International Building room 1910-1911 Patentee after: Wuhan Kebei Polytron Technologies Inc Address before: 430070 Hubei province Wuhan Wuluo Road No. 717, Siu Fu International Building room 1910-1911 Patentee before: Wuhan Kebei Technology Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111214 |