CN109794486A - A kind of reliable pipe network system of gathering dust of energy conservation - Google Patents
A kind of reliable pipe network system of gathering dust of energy conservation Download PDFInfo
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- CN109794486A CN109794486A CN201910226993.7A CN201910226993A CN109794486A CN 109794486 A CN109794486 A CN 109794486A CN 201910226993 A CN201910226993 A CN 201910226993A CN 109794486 A CN109794486 A CN 109794486A
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- dust
- valve
- gathering
- network system
- pipe
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Abstract
The present invention discloses a kind of reliable pipe network system of gathering dust of energy conservation, including dedusting fan, supervisor of gathering dust, the branch pipe that gathers dust, valve I, the outlet end of the supervisor of gathering dust is connected to the air inlet of dedusting fan, at least two branch pipes that gather dust are parallel on the supervisor of gathering dust, valve I is installed on the branch pipe that gathers dust, the branch pipe that gathers dust is also connected with clean wind pipe for aspirating air on the supervisor of gathering dust for aspirating dusty gas to be trapped.The present invention is gathered dust in tradition adds clean wind pipe to supply high speed clean air stream in pipe network system, to be avoided that in pipe that dust accumulation causes plugging, and to the branch pipe Open valve that gathers dust that needs gather dust, the then closing valve to gather dust is not needed, dust-collecting efficiency is improved with this, energy-saving effect is played simultaneously, avoid tradition from gathering dust problem that pipe network system respectively gathers dust more than the normally opened bring noise of branch pipe, vibration, failure and security risk, it is whole to have the characteristics that structure is simple, energy-saving, dust-collecting efficiency is high, safe and reliable.
Description
Technical field
The invention belongs to technical field of environment protection equipment, and in particular to a kind of structure is simple, energy-saving, dust-collecting efficiency is high,
The reliable pipe network system of gathering dust of safe and reliable energy conservation.
Background technique
In industrial processes, treating flour dust mainly uses " dedusting " this technique in industrial waste gas, in order to effectively catch
Collect dust and reduce operation expense, dust removal installation scene generallys use manufacture negative pressure inside multiple spot trapping and dust removal installation
Mode, and the dust object at scene captured in the method wait catch a setting dust-collecting pipe, cover, collected.Since dedusting trapping is existing
Field production wire length, production status adjustment variation and difference, the negative pressure for being often related to huge trap sites and complexity trap pipe network and control
System processed, and multiple branch pipes that gather dust of the conventional pipe network that gathers dust are normally open during the work time, not only dedusting fan is wanted
Whole full-speed operation causes the power consumption of dedusting fan to be basically unchanged, the huge energy consumption of dust collecting system, and bring is made an uproar therewith
Sound, vibration, fault point and security risk point also increase therewith, bring many unfavorable factors for production.It is gathering dust although also having
Valve is set to adjust or even close the branch pipe that gathers dust, thus to avoid normally opened caused noise, vibration and security risk on branch pipe
More problems, but if since technique adjustment leads to multiple branch pipe closings of gathering dust, and will lead to corresponding dust-collecting pipe because lacking gas
Stream or deficiency of air cause dust accumulation and plugging；In addition, in order to energy-saving, the also gas in good grounds pipeline in the prior art
Pressure, flow adjust the speed dedusting fan, although can complete the demand gathered dust and achieve the purpose that energy-saving, but still deposit
The problem of leading to dust accumulation because of the closing for the branch pipe that gathers dust or adjustment in the duct and plugging.Therefore, how receipts can be improved
Dirt efficiency, but can guarantee dust collecting system is securely and reliably technical problem urgently to be resolved at present.
Summary of the invention
The present invention is in view of the problems of the existing technology and insufficient, provides that a kind of structure is simple, energy-saving, effect of gathering dust
The reliable pipe network system of gathering dust of high, the safe and reliable energy conservation of rate.
The present invention is implemented as follows: including dedusting fan, supervisor of gathering dust, the branch pipe that gathers dust, valve I, the supervisor of gathering dust
Outlet end be connected to the air inlet of dedusting fan, it is described gather dust supervisor on be parallel at least two branch pipes that gather dust, it is described to gather dust
Valve I is installed, the branch pipe that gathers dust is also connected on the supervisor of gathering dust for aspirating dusty gas to be trapped on branch pipe
Clean wind pipe is for aspirating air.
The present invention adds clean wind pipe to supply high speed clean air stream, so as to keep away in pipe network system by gathering dust in tradition
Exempt from dust accumulation in pipe and causes plugging, and to the branch pipe Open valve that gathers dust that needs gather dust, the then closing valve to gather dust is not needed,
Can be energy-saving and the efficiency gathered dust be improved, and is avoided that tradition pipe network system of gathering dust respectively is gathered dust the normally opened band of branch pipe
The problem more than noise, vibration, failure and security risk come.Therefore, the present invention has that structure is simple, energy-saving, effect of gathering dust
Rate height, safe and reliable feature.
Detailed description of the invention
Fig. 1 is principle schematic diagram of the present invention；
In figure: 1- dedusting fan, 2- gather dust supervisor, and 3- gathers dust branch pipe, 4- valve I, 5- clean wind pipe, 6- valve II, and 8- dust passes
Sensor, 9- governor, 10- wind pressure sensor, 11- shut-off valve, 12- gather dust submain, 13- electric control valve III.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples, but is not subject in any way to the present invention
Limitation, based on present invention teach that made any changes and modifications, all belong to the scope of protection of the present invention.
As shown in Figure 1, the present invention includes dedusting fan 1, supervisor 2 of gathering dust, the branch pipe 3 that gathers dust, valve I 4, the supervisor of gathering dust
2 outlet end is connected to the air inlet of dedusting fan 1, is parallel at least two branch pipes 3 that gather dust on the supervisor 2 of gathering dust, described
It gathers dust and valve I 4 is installed on branch pipe 3, the branch pipe 3 that gathers dust is described to gather dust on supervisor 2 for aspirating dusty gas to be trapped
Clean wind pipe 5 is also connected with for aspirating air.
The invention also includes controller, valve II 6 is installed on the clean wind pipe 5, the valve I 4 and valve II 6 are electricity
Control valve is simultaneously connect with the output end signal of controller respectively.
The invention also includes dust sensor 8, the dust sensor 8 is set to 4 front end of valve I gathered dust on branch pipe 3
And connect with the input end signal of controller, the controller receive the signal of dust sensor 8 and compared with preset threshold after
Control signal is exported to valve I 4 and/or valve II 6.
The invention also includes equipment working state signal picker, the equipment working state signal picker acquisition is gathered dust
The working condition of equipment corresponding to branch pipe 3 is simultaneously connect with the input end signal of controller, the controller receiving device work shape
The signal of state signal picker simultaneously exports control signal to valve I 4 and/or valve II 6 afterwards compared with preset threshold.
The invention also includes governor 9, wind pressure sensor 10, the output end of the governor 9 is connect with dedusting fan 1,
The input terminal of the governor 9 and the output end signal of controller connect, and the wind pressure sensor 10, which is set to, to gather dust on supervisor 2
And connect with the input end signal of controller, the controller receive the signal of wind pressure sensor 10 and compared with preset threshold after
Control signal is exported to governor 9.
The dedusting fan 1 is one, or in parallel and/or more concatenated.
The dedusting fan 1 of the parallel connection works asynchronously and the wind pressure and wind speed of output end are identical.
The asynchronous work of dedusting fan 1 of the parallel connection and front end and/or rear end pipeline are provided with shut-off valve 11.
The invention also includes the submain 12 that gathers dust, at least two submains 12 that gather dust, institute are parallel on the supervisor 2 of gathering dust
It states the branch pipe 3 that gathers dust to be arranged in parallel on the submain 12 that gathers dust, the clean wind pipe 5 is fixedly installed on each submain that gathers dust respectively
On 12.
The submain 12 that gathers dust 2 sides of supervisor of closely gathering dust are provided with electric control valve III 13, the electric control valve III 13 with
The output end signal of controller connects.
The working principle of the invention and the course of work:
The present invention adds clean wind pipe to supply high speed clean air stream, to be avoided that pipe in pipe network system by gathering dust in tradition
Middle dust accumulation causes plugging, and can selectively unlock or close valve according to the needs that gather dust to the branch pipe that gathers dust, and energy saving can drop
Consumption, and can improve the efficiency gathered dust, and be avoided that tradition gather dust pipe network system respectively gather dust the normally opened bring noise of branch pipe, shake
Problem more than dynamic, failure and security risk.Further, controller is to the electric control valve II on clean wind pipe and the electricity to gather dust on branch pipe
Control valve I is controlled, and enables the controller to carry out folding combination to any one or more electric control valves as needed, from
And it can be realized the on-demand automatic control of dust collecting system.Further, controller gather dust the dust sensor on branch pipe letter
Number and export control signal afterwards compared with preset threshold to valve I and/or valve II so that system can be according to respectively gathering dust
The corresponding environment adjust automatically of branch pipe is gathered dust the size and folding of valve, can be reached intelligence and be gathered dust, to guarantee the ring that respectively gathers dust
The safety in border, and it has been avoided that the problem more than noise, vibration, failure and security risk caused by the branch pipe that gathers dust is normally opened, Neng Gouyou
Effect improves the security reliability of whole system.Further, the controller branch pipe that gathers dust corresponds to the equipment working state of equipment
The signal of signal picker simultaneously exports control signal to valve I and/or valve II, so that system afterwards compared with preset threshold
Can gather dust the size and folding of valve according to the corresponding equipment working state adjust automatically of the branch pipe that respectively gathers dust, and can reach intelligence
It gathers dust, to guarantee the safety of environment of respectively gathering dust, and has been avoided that noise, vibration, failure and peace caused by the branch pipe that gathers dust is normally opened
Problem more than full hidden danger, can effectively improve the security reliability of whole system.Further, controller gathers dust on supervisor
Wind pressure sensor signal, according to wind pressure size output signal to automatically governor adjustment dedusting fan revolving speed, thus protecting
On the basis of demonstrate,proving efficiency of dust collection, and it can significantly lower the energy consumption of system.Further, the dedusting fan in system be one or
In parallel and/or more concatenated, working fan quantity is adjusted flexibly in the number so as to be opened and closed according to dedusting branch pipe, removes in satisfaction
While dirt air quantity, achieve the purpose that energy-saving.Further, by being responsible for upper at least two in parallel time masters of gathering dust gathering dust
Pipe, both can be reduced the length for the branch pipe that gathers dust, and had avoided dust collecting system unordered in a jumble, be also convenient for the grouping control of dust collection pipe.To sum up
Described, the present invention has the characteristics that structure is simple, energy-saving, dust-collecting efficiency is high, safe and reliable.
As shown in Figure 1, increasing the clean wind pipe 5 that number is 1 on the submain 12 that gathers dust that number is A, and it is equipped with and controls
The electric control valve II 6 of device control terminal connection processed, the not responsible suction dusty gas of clean wind pipe 5, and need to guarantee suction clean air；
And number is that 2., 3., 4., 5., 6. ... the branch pipe 3 that gathers dust of .n is responsible for aspirating to be trapped contain on the submain 12 that gathers dust of number A
Dust and gas body, and be equipped with electric control valve I 4 and connect respectively with the control terminal of controller, controller is according to respectively gathering dust on branch pipe 3
Dust sensor 8 detects numerical value compared with preset threshold, according to comparison result opening to any one or more electric control valves I 4
Conjunction is combined.Accordingly, there can be always the high speed supplied from clean wind pipe 5 clear in the submain 12 that gathers dust of this segment number of b-c A
Clean air stream, so that the Duan Guanzhong be avoided to lead to the too small formation dust accumulation of wind speed, wind pressure since the branch pipe 3 that gathers dust is closed and make
At plugging.
During gathering dust, according to gather dust supervisor 2 on wind pressure sensor 10 detection numerical value, controller control F1, F2,
Tri- 1 cooperatings of dedusting fan of F3 [ are simultaneously operable to improve flow velocity and wind pressure and (need to guarantee that F1, F2 work asynchronously, it may be assumed that fortune
Row parameter is identical, hardware configuration configuration is identical, and f point is identical as wind pressure, the flow velocity of g point), in parallel wherein one can also be closed
Dedusting fan 1(, which closes the corresponding shut-off valve 11 of dedusting fan 1, prevents air-flow from flowing backwards) ], as necessary by control governor 9 to adjust
The revolving speed of whole dedusting fan 1, wherein the dedusting fan 1 that F1, F2 in parallel are two pipeline parallel connections realizes manufacture air negative pressure
Function (e point is negative pressuren zone, and f is positive pressure)；F3 dedusting fan 1 carries out secondary pressurized (g point is negative pressuren zone, and h point is zone of positive pressure), from
And dust-contained airflow is made to enter one of technique under desulfurizing tower T().Have more gather dust submain 12 in the case where, gather dust for whole branch
Submain 12 does not all need in the case where gathering dust, and the air-flow that controller closes electric control valve III 13 and prevents from gathering dust in supervisor 2 is flow backwards.
Claims (10)
- The pipe network system 1. a kind of energy conservation is reliably gathered dust, it is characterised in that including dedusting fan (1), supervisor (2) of gathering dust, branch of gathering dust (3), valve I (4) are managed, the outlet end of the supervisor (2) of gathering dust is connected to the air inlet of dedusting fan (1), the supervisor of gathering dust (2) it is parallel at least two branch pipes that gather dust (3) on, is equipped with valve I (4) on the branch pipe that gathers dust (3), the branch pipe that gathers dust (3) for aspirating dusty gas to be trapped, described gather dust is also connected with clean wind pipe (5) on supervisor (2) and is used to aspirate air.
- 2. the reliable pipe network system of gathering dust of energy conservation according to claim 1, it is characterised in that it further include controller, the net wind Valve II (6) is installed on pipe (5), the valve I (4) and valve II (6) be electric control valve and respectively with the output of controller End signal connection.
- 3. the reliable pipe network system of gathering dust of energy conservation according to claim 2, it is characterised in that it further include dust sensor (8), Valve I (4) front end that the dust sensor (8) is set on the branch pipe that gathers dust (3) is simultaneously connect with the input end signal of controller, The controller receive the signal of dust sensor (8) and export afterwards compared with preset threshold control signal to valve I (4) and/ Or valve II (6).
- 4. the reliable pipe network system of gathering dust of energy conservation according to claim 2, it is characterised in that further include equipment working state letter Number collector, the equipment working state signal picker acquisition gather dust equipment corresponding to branch pipe (3) working condition and with control The input end signal of device processed connects, the signal of the controller receiving device working state signal collector and with preset threshold ratio Control signal is exported more afterwards to valve I (4) and/or valve II (6).
- 5. the reliable pipe network system of gathering dust of energy conservation according to claim 2, it is characterised in that further include governor (9), wind pressure The output end of sensor (10), the governor (9) is connect with dedusting fan (1), the input terminal of the governor (9) and control The output end signal of device connects, and the wind pressure sensor (10), which is set to, gathers dust on supervisor (2) and believe with the input terminal of controller Number connection, the signal that the controller receives wind pressure sensor (10) simultaneously exports control signal to adjusting the speed afterwards compared with preset threshold Device (9).
- 6. reliably being gathered dust pipe network system according to energy conservation described in claim 2 to 5 any one, it is characterised in that the dedusting wind Machine (1) is one, or in parallel and/or more concatenated.
- 7. the reliable pipe network system of gathering dust of energy conservation according to claim 6, it is characterised in that the dedusting fan (1) of the parallel connection The wind pressure and wind speed of synchronous working and output end are identical.
- 8. the reliable pipe network system of gathering dust of energy conservation according to claim 6, it is characterised in that the dedusting fan (1) of the parallel connection Asynchronous work and front end and/or rear end pipeline are provided with shut-off valve (11).
- 9. the reliable pipe network system of gathering dust of energy conservation according to claim 6, it is characterised in that it further include gather dust submain (12), Described gather dust is parallel at least two submains that gather dust (12) on supervisor (2), and the branch pipe that gathers dust (3) is arranged in parallel in gathering dust time It is responsible on (12), the clean wind pipe (5) is fixedly installed on respectively on each submain that gathers dust (12).
- 10. the reliable pipe network system of gathering dust of energy conservation according to claim 9, it is characterised in that the submain that gathers dust (12) is close Supervisor (2) side of gathering dust is provided with electric control valve III (13), and the output end signal of the electric control valve III (13) and controller connects It connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910226993.7A CN109794486A (en) | 2019-03-25 | 2019-03-25 | A kind of reliable pipe network system of gathering dust of energy conservation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910226993.7A CN109794486A (en) | 2019-03-25 | 2019-03-25 | A kind of reliable pipe network system of gathering dust of energy conservation |
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| Publication Number | Publication Date |
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| CN109794486A true CN109794486A (en) | 2019-05-24 |
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ID=66563186
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910226993.7A Pending CN109794486A (en) | 2019-03-25 | 2019-03-25 | A kind of reliable pipe network system of gathering dust of energy conservation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111360017A (en) * | 2020-03-17 | 2020-07-03 | 珠海科艺普实验室设备有限公司 | Exhaust system and exhaust method |
| CN111940447A (en) * | 2019-10-08 | 2020-11-17 | 广东利元亨智能装备股份有限公司 | Dust removal device and self-cleaning method thereof |
| CN114505317A (en) * | 2022-02-07 | 2022-05-17 | 江苏三一环境科技有限公司 | Negative pressure dust removal system and regulation and control method thereof |
| CN115301665A (en) * | 2022-08-25 | 2022-11-08 | 江西斯米克陶瓷有限公司 | Dust removal device for ceramic tile material piece |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201351984Y (en) * | 2008-11-27 | 2009-11-25 | 深圳烟草工业有限责任公司 | Energy-saving and cost-reducing environment dust removing system |
| DE102008056938A1 (en) * | 2008-08-22 | 2010-02-25 | Frieters, Oliver | Dust exhausting equipment controlling method for industry, involves calculating dust quantity per unit volume, and automatically triggering action during exceeding of permissible dust quantity per unit volume using controller |
| CN204035163U (en) * | 2014-06-27 | 2014-12-24 | 立邦涂料(成都)有限公司 | A kind of workshop dust collector |
| CN204453913U (en) * | 2014-12-29 | 2015-07-08 | 三一汽车制造有限公司 | Dicang dust collector and mixing plant |
| CN204485539U (en) * | 2015-03-06 | 2015-07-22 | 张永胜 | Bag-type dust ash silo cinerary device |
| CN206215642U (en) * | 2016-11-14 | 2017-06-06 | 中钢集团天澄环保科技股份有限公司 | Concentrate moving intelligent type scope of operation trapping purifier |
| CN108386377A (en) * | 2018-02-11 | 2018-08-10 | 上海联达节能科技股份有限公司 | A kind of remodeling method of dedusting fan end control system and dust pelletizing system |
| CN207981794U (en) * | 2017-12-28 | 2018-10-19 | 湖南省湘衡盐化有限责任公司 | A kind of wind-force dedusting pipe-line system |
| CN209716002U (en) * | 2019-03-25 | 2019-12-03 | 云南天朗节能环保集团有限公司 | A kind of reliable pipe network system of gathering dust of energy conservation |
-
2019
- 2019-03-25 CN CN201910226993.7A patent/CN109794486A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008056938A1 (en) * | 2008-08-22 | 2010-02-25 | Frieters, Oliver | Dust exhausting equipment controlling method for industry, involves calculating dust quantity per unit volume, and automatically triggering action during exceeding of permissible dust quantity per unit volume using controller |
| CN201351984Y (en) * | 2008-11-27 | 2009-11-25 | 深圳烟草工业有限责任公司 | Energy-saving and cost-reducing environment dust removing system |
| CN204035163U (en) * | 2014-06-27 | 2014-12-24 | 立邦涂料(成都)有限公司 | A kind of workshop dust collector |
| CN204453913U (en) * | 2014-12-29 | 2015-07-08 | 三一汽车制造有限公司 | Dicang dust collector and mixing plant |
| CN204485539U (en) * | 2015-03-06 | 2015-07-22 | 张永胜 | Bag-type dust ash silo cinerary device |
| CN206215642U (en) * | 2016-11-14 | 2017-06-06 | 中钢集团天澄环保科技股份有限公司 | Concentrate moving intelligent type scope of operation trapping purifier |
| CN207981794U (en) * | 2017-12-28 | 2018-10-19 | 湖南省湘衡盐化有限责任公司 | A kind of wind-force dedusting pipe-line system |
| CN108386377A (en) * | 2018-02-11 | 2018-08-10 | 上海联达节能科技股份有限公司 | A kind of remodeling method of dedusting fan end control system and dust pelletizing system |
| CN209716002U (en) * | 2019-03-25 | 2019-12-03 | 云南天朗节能环保集团有限公司 | A kind of reliable pipe network system of gathering dust of energy conservation |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111940447A (en) * | 2019-10-08 | 2020-11-17 | 广东利元亨智能装备股份有限公司 | Dust removal device and self-cleaning method thereof |
| CN111360017A (en) * | 2020-03-17 | 2020-07-03 | 珠海科艺普实验室设备有限公司 | Exhaust system and exhaust method |
| CN114505317A (en) * | 2022-02-07 | 2022-05-17 | 江苏三一环境科技有限公司 | Negative pressure dust removal system and regulation and control method thereof |
| CN115301665A (en) * | 2022-08-25 | 2022-11-08 | 江西斯米克陶瓷有限公司 | Dust removal device for ceramic tile material piece |
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