CN103727051B - Multi-branch accurate flow control system with large sucking rate - Google Patents
Multi-branch accurate flow control system with large sucking rate Download PDFInfo
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- CN103727051B CN103727051B CN201410021964.4A CN201410021964A CN103727051B CN 103727051 B CN103727051 B CN 103727051B CN 201410021964 A CN201410021964 A CN 201410021964A CN 103727051 B CN103727051 B CN 103727051B
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Abstract
The invention discloses a multi-branch accurate flow control system with a large sucking rate, and belongs to the field of control of vacuum equipment. The multi-branch accurate flow control system with the large sucking rate comprises a vacuum system (2). The multi-branch accurate flow control system is characterized by comprising a plurality of branch suction pipelines (6) which are connected with the vacuum system (2); all branch suction pipelines (6) are simultaneously accessed into a main suction pipeline (15); the main suction pipeline (15) is orderly connected with an air supply unit, a pressure detection adjusting unit and a vacuum supply unit in parallel; the air supply unit, the pressure detection adjusting unit and the vacuum supply unit are controlled by a control circuit. By adopting the accurate flow control system disclosed by the invention, the large-flow multi-branch vacuum supply operation can be carried on a large vacuum system, the accurate flow control can be ensured, a programmable logic controller (PLC) is adopted to control the system, meanwhile, flow control can be relatively well achieved from a main station and a slave station of the PLC respectively, and the intelligent degree is relatively high.
Description
Technical field
Large rate of air sucked in required multiple branch circuit precise control of flew system, belongs to field of control of vacuum equipment.Be specifically related to a kind of precise control of flew system that large-scale vacuum system is vacuumized.
Background technique
In the prior art, many scientific experiments needs to carry out in the environment of vacuum, but existing similar vacuum experiment is because the restriction of condition and experimental scale also exists, and rate of air sucked in required is little and the few precision of branch path is not high, the problems such as automaticity is low.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, provides a kind of and carries out vacuum pumping for large-scale vacuum system, can ensure the large rate of air sucked in required multiple branch circuit precise control of flew system of precise control of flew in branch's suction line.
The technical solution adopted for the present invention to solve the technical problems is: this large rate of air sucked in required multiple branch circuit precise control of flew system, comprise vacuum system, it is characterized in that: comprise many branch's suction line be connected with vacuum system, all branches suction line accesses main suction line simultaneously, main suction line is connected in parallel to successively tonifying Qi unit, Pressure testing regulon and vacuum unit, tonifying Qi unit, Pressure testing regulon and vacuum unit are controlled by control circuit.
Described vacuum unit is one or more groups vacuum pump set, the main suction line of vacuum pump suction line one end parallel connection access in vacuum pump set, the other end of vacuum pump suction line is connected with the suction port of water ring vaccum pump after being connected in series safety check, the relief opening of water ring vaccum pump is connected with steam-water separator by pipeline, waterback pump is connected in series with in the water return pipeline of steam-water separator, the exhaust ports of steam-water separator is connected with gas exhaust piping, the other end of gas exhaust piping is connected with baffler, inlet pipeline is sequentially connected in series manual ball valve and is connected with the water intake of water ring vaccum pump with after electric switching valve, inlet pipeline is provided with raw water service pump simultaneously, motor is connected with water ring vaccum pump by speed reducer.
Described vacuum pump set can be three groups.
Described tonifying Qi unit is the tonifying Qi pipeline of one or more parallel connection, and every bar tonifying Qi pipeline is connected in series with tonifying Qi modulating valve respectively, and the end of every bar tonifying Qi pipeline is provided with filter screen.
Described Pressure testing regulon is the 3rd vacuum gauge, the first pressure transmitter, main line modulating valve, the 4th vacuum gauge and the second pressure transmitter that are arranged between tonifying Qi unit and vacuum unit.
The first described pressure transmitter and the second pressure transmitter are absolute pressure transmitter.
Described branch's suction line is many, it has been sequentially connected in series flowmeter, the second vacuum gauge and pneumatic control valve.
Described flow counts open channel flow gauge.
In described control circuit, in 6KV voltage access high-tension switch cabinet U1, high-tension switch cabinet U1 output terminal connects high pressure soft starting cabinet U2 ~ U4 successively for its power supply, be connected with the DI module of PLC slave station and DO module while of high-tension switch cabinet U1, high-tension switch cabinet U1, high pressure soft starting cabinet U2 ~ U4, electric valve actuator U5 ~ U7, absolute pressure transmitter U8 and positive pressure transmitter U9 is connected with the communication module of PLC slave station by bus Profibus-DP2, be connected with the DI module of PLC slave station and DO module while of motor starter U10 ~ U13, pneumatic positioner valve U14, flowmeter U15 and absolute pressure transmitter U16 is connected with the host CPU module of PLC master station by bus Profibus-DP1 simultaneously, Fiber connection is passed through between PLC master station and slave station.
Described PLC master station model is S7-300, PLC slave station model is ET200M.
Compared with prior art, of the present invention had beneficial effect is:
1, precise control of flew system of the present invention can carry out the vacuum pumping simultaneously of Duo Tiao branch suction line to large-scale vacuum system, and the flow in Mei Tiao branch suction line can reach 3m
3/ s, and can accurately control by guaranteed flow.
2, intrasystem flowmeter adopts open channel flow gauge, has the advantages such as output signal is large, permanent pressure loss is little, flowing is very stable, antijamming capability is strong.
3, this control system can adopt conventional means to realize the operation vacuumized vacuum system, and controlled the automatic adjustment of feasible system by corresponding software, application area is wider simultaneously.
Accompanying drawing explanation
Fig. 1 is large rate of air sucked in required multiple branch circuit precise control of flew system architecture schematic diagram.
Fig. 2 is large rate of air sucked in required multiple branch circuit precise control of flew system vacuum pump pumping cells structural representation.
Fig. 3 is large rate of air sucked in required multiple branch circuit precise control of flew Systematical control schematic diagram.
Wherein: 1, first vacuum gauge 2, vacuum system 3, flowmeter 4, second vacuum gauge 5, pneumatic control valve 6, branch's suction line 7, tonifying Qi pipeline 8, tonifying Qi modulating valve 9, filter screen 10, 3rd vacuum gauge 11, first pressure transmitter 12, main line modulating valve 13, 4th vacuum gauge 14, second pressure transmitter 15, main suction line 16, vacuum pump set 17, vacuum pump suction line 18, safety check 19, water ring vaccum pump 20, steam-water separator 21, water return pipeline 22, gas exhaust piping 23, inlet pipeline 24, ball valve 25, electric switching valve 26, motor 27, speed reducer.
Embodiment
Fig. 1 ~ 3 are most preferred embodiments of the present invention, and below in conjunction with accompanying drawing 1 ~ 3, the present invention will be further described.
As shown in Figure 1, in precise control of flew system of the present invention, vacuum system 2 is provided with the first vacuum gauge 1.Duo Tiao branch suction line 6 is connected with, 1 pilot region in the corresponding vacuum system 2 of each branch's suction line 6 difference in vacuum system 2 side.Each branch's suction line 6 has been sequentially connected in series flowmeter 3, second vacuum gauge 4 and pneumatic control valve 5, wherein flowmeter 3 adopts open channel flow gauge.The Duo Tiao branch suction line 6 of drawing in vacuum system 2 imports in main suction line 15 simultaneously, and the flow in Mei Tiao branch suction line 6 can reach 3m
3/ s, main suction line 15 is connected in parallel to tonifying Qi unit and 3 groups of vacuum pump set 16 simultaneously.In main suction line 15, the 3rd vacuum gauge 10, first pressure transmitter 11, main line modulating valve 12, the 4th vacuum gauge 13 and the second pressure transmitter 14, first pressure transmitter 11 has been sequentially connected in series and the second pressure transmitter 14 is absolute pressure sensor between tonifying Qi unit and 3 groups of vacuum pump set 16.Tonifying Qi unit is two tonifying Qi pipelines 7 in parallel, and every bar tonifying Qi pipeline 7 is connected in series with tonifying Qi modulating valve 8 respectively, and the end of every bar tonifying Qi pipeline 7 is provided with filter screen 9.Vacuum pump set 16 can arrange one or more groups as required, and tonifying Qi pipeline 7 simultaneously can arrange one or many of being arranged side by side as required.
As shown in Figure 2, the main suction line 15 of vacuum pump suction line 17 one end parallel connection access in vacuum pump set 16, the other end of vacuum pump suction line 17 is connected in series safety check 18 and is connected with the suction port of water ring vaccum pump 19 afterwards, the relief opening of water ring vaccum pump 19 is connected with steam-water separator 20 by pipeline, the gas of the gas being mingled with large quantity of moisture of being discharged by water ring vaccum pump 19 drying after steam-water separator 20 is discharged by gas exhaust piping 22, isolated water is reclaimed by water return pipeline 21, waterback pump (not shown in FIG.) is connected in series with in water return pipeline 21, the exhaust ports of steam-water separator 20 is connected with gas exhaust piping 22, the other end of gas exhaust piping 22 is connected with baffler (not shown in FIG.).Inlet pipeline 23 is sequentially connected in series ball valve 24 and is connected with the water intake of water ring vaccum pump 19 with after electric switching valve 25, and inlet pipeline 23 is provided with raw water service pump (not shown in FIG.) simultaneously.Motor 26 is connected with water ring vaccum pump 19 by speed reducer 27.
In large rate of air sucked in required multiple branch circuit precise control of flew systematic schematic diagram as shown in Figure 3, in 6KV voltage access high-tension switch cabinet U1, high-tension switch cabinet U1 output terminal connects high pressure soft starting cabinet U2 ~ U4 successively for its power supply, is connected the while of high-tension switch cabinet U1 with the DI module of PLC slave station and DO module.High-tension switch cabinet U1, high pressure soft starting cabinet U2 ~ U4, electric valve actuator U5 ~ U7, absolute pressure transmitter U8 and positive pressure transmitter U9 are connected with the communication module of PLC slave station by bus Profibus-DP2.Be connected with the DI module of PLC slave station and DO module while of motor starter U10 ~ U13.Pneumatic positioner valve U14, flowmeter U15 and absolute pressure transmitter U16 are connected with the host CPU module of PLC master station by bus Profibus-DP1 simultaneously.PLC master station realizes being connected respectively by the communication module in it with PLC slave station.
In figure 3, three water ring vaccum pumps 19 in the corresponding 3 groups of vacuum pump set 16 of high pressure soft starting cabinet U2 ~ U4 difference, start three water ring vaccum pumps 19 respectively by high pressure soft starting cabinet U2 ~ U4.Electric valve actuator U5 is for controlling main line modulating valve 12, and electric valve actuator U6 ~ U7 is respectively used to two tonifying Qi modulating valve 8 in control two tonifying Qi pipelines 7.Absolute pressure transmitter U8 is the first pressure transmitter 11, and positive pressure transmitter U9 is that the positive pressure be connected on inlet pipeline 23 send device.Motor starter U10 correspondence is connected with three inlet pipelines 23, and for the raw water service pump supplied water for three water ring vaccum pumps 19, raw water service pump is connected with wet pit (not shown in FIG.); Motor starter U11 correspondence and the waterback pump in three water return pipelines 21; The corresponding backwater stand by pump of motor starter U12.Motor starter U13 is the motor in system in cooling tower (not shown in FIG.), in systems in practice, is connected in series waterback pump and is connected with cooling tower water inlet after three water return pipelines 21 are compiled in a place.Pneumatic positioner valve U14 represents 16 identical pneumatic positioner valves, 16 pneumatic control valves 5 in branch's suction line 6 of 16 corresponding above-mentioned respectively DN200.Flowmeter U15 represents 18 flowmeters, 18 open channel flow gauge in 18 corresponding above-mentioned respectively branch's suction line 6.Corresponding second pressure transmitter 14 of absolute pressure transmitter U16.
Specific works process and principle as follows: when bringing into operation, first operator open each peripheral unit in native system by PLC, comprise by the motor in motor starter U13 unlatching cooling tower, start raw water service pump and waterback pump respectively by motor starter U10 and motor starter U11.Then according to concrete Test item and the quantity requiring branch's suction line 6 that setting needs are opened, and the inspiratory flow of Mei Tiao branch suction line 6 is calculated respectively.Then the total discharge of air-breathing in main suction line 15 is calculated by the inspiratory flow PLC of Mei Tiao branch suction line 6, and the quantity of water ring vaccum pump 19 needing to open is calculated by this mass flow meters, make total gettering quantity of the water ring vaccum pump 19 of all unlatchings be greater than total discharge in main suction line 15.Then one or more in high pressure soft starting cabinet U2 ~ U4 is opened by PLC, by pneumatic positioner valve U14, the pneumatic control valve 5 in the branch's suction line 6 needing to open is opened to corresponding aperture simultaneously, does not need branch's suction line 6 of opening to close.Now open electric valve actuator U5 ~ U7 by PLC, started the aperture of main line modulating valve 12 and two tonifying Qi modulating valve 8 by electric valve actuator U5 ~ U7.
Now, tonifying Qi modulating valve 8 and the first pressure transmitter 11 in main suction line 15 and the second pressure transmitter 14 and two tonifying Qi modulating valve 8 form pid loop, ensure that pressure of inspiration(Pi) is stabilized in the scope of technical requirements; Pneumatic control valve 5 simultaneously in each branch's suction line 6 and flowmeter 3(flowmeter U15) form pid loop, carry out Self-tuning System at any time, arbitrary branch road changes, and other branch road is adjusted simultaneously, ensures that the flow of each branch road is within the scope of technical requirements.
When system cloud gray model, the DI module in PLC slave station receives high-tension switch cabinet U1 and each water pump, the start stop signal of cooling tower electric machine and the signal of working state simultaneously, sends control signal by DO module to each equipment simultaneously.
PLC master station model is S7-300 in the present invention, and slave station model is pass through Fiber connection between the master and slave station of ET200M, PLC.PLC master station is connected with control panel simultaneously.
The above is only preferred embodiment of the present invention, and be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (8)
1. large rate of air sucked in required multiple branch circuit precise control of flew system, comprise vacuum system (2), it is characterized in that: in vacuum system (2), be provided with multiple pilot region, Duo Tiao branch suction line (6) is connected with in vacuum system (2) side, 1 pilot region in each branch's suction line (6) the corresponding vacuum system of difference (2), all branches suction line (6) access main suction line (15) simultaneously, (15) are connected in parallel to tonifying Qi unit to main suction line successively, Pressure testing regulon and vacuum unit, tonifying Qi unit, Pressure testing regulon and vacuum unit are controlled by control circuit,
Described vacuum unit is one group or three groups of vacuum pump set (16), vacuum pump suction line (17) one end parallel connection main suction line of access (15) in vacuum pump set (16), the other end of vacuum pump suction line (17) is connected in series safety check (18) and is connected with the suction port of water ring vaccum pump (19) afterwards, the relief opening of water ring vaccum pump (19) is connected with steam-water separator (20) by pipeline, waterback pump is connected in series with in the water return pipeline (21) of steam-water separator (20), the exhaust ports of steam-water separator (20) is connected with gas exhaust piping (22), the other end of gas exhaust piping (22) is connected with baffler, inlet pipeline (23) is sequentially connected in series manual ball valve (24) and is connected with the water intake of water ring vaccum pump (19) with after electric switching valve (25), inlet pipeline (23) is provided with raw water service pump simultaneously, motor (26) is connected with water ring vaccum pump (19) by speed reducer (27).
2. large rate of air sucked in required multiple branch circuit precise control of flew system according to claim 1, it is characterized in that: described tonifying Qi unit is the tonifying Qi pipeline (7) of one or more parallel connection, every bar tonifying Qi pipeline (7) is connected in series with tonifying Qi modulating valve (8) respectively, the end of every bar tonifying Qi pipeline (7) is provided with filter screen (9).
3. large rate of air sucked in required multiple branch circuit precise control of flew system according to claim 1, is characterized in that: described Pressure testing regulon is the 3rd vacuum gauge (10), the first pressure transmitter (11), main line modulating valve (12), the 4th vacuum gauge (13) and the second pressure transmitter (14) that are arranged between tonifying Qi unit and vacuum unit.
4. large rate of air sucked in required multiple branch circuit precise control of flew system according to claim 3, is characterized in that: described the first pressure transmitter (11) and the second pressure transmitter (14) are absolute pressure transmitter.
5. large rate of air sucked in required multiple branch circuit precise control of flew system according to claim 1, is characterized in that: described branch's suction line (6) has been sequentially connected in series flowmeter (3), the second vacuum gauge (4) and pneumatic control valve (5).
6. large rate of air sucked in required multiple branch circuit precise control of flew system according to claim 5, is characterized in that: described flowmeter (3) is open channel flow gauge.
7. large rate of air sucked in required multiple branch circuit precise control of flew system according to claim 1, it is characterized in that: in described control circuit, in 6KV voltage access high-tension switch cabinet (U1), high-tension switch cabinet (U1) output terminal connects high pressure soft starting cabinet (U2) ~ (U4) successively for its power supply, be connected with the DI module of PLC slave station and DO module while of high-tension switch cabinet (U1), high-tension switch cabinet (U1), high pressure soft starting cabinet (U2) ~ (U4), electric valve actuator (U5) ~ (U7), absolute pressure transmitter (U8) and positive pressure transmitter (U9) are connected with the communication module of PLC slave station by bus Profibus-DP2, be connected with the DI module of PLC slave station and DO module while of motor starter (U10) ~ (U13), pneumatic positioner valve (U14), flowmeter (U15) and absolute pressure transmitter (U16) are connected with the host CPU module of PLC master station by bus Profibus-DP1 simultaneously, Fiber connection is passed through between PLC master station and slave station.
8. large rate of air sucked in required multiple branch circuit precise control of flew system according to claim 7, is characterized in that: described PLC master station model is S7-300, PLC slave station model is ET200M.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410021964.4A CN103727051B (en) | 2014-01-18 | 2014-01-18 | Multi-branch accurate flow control system with large sucking rate |
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| CN201410021964.4A CN103727051B (en) | 2014-01-18 | 2014-01-18 | Multi-branch accurate flow control system with large sucking rate |
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| CN103727051B true CN103727051B (en) | 2015-05-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105728078A (en) * | 2016-04-13 | 2016-07-06 | 安徽万瑞冷电科技有限公司 | Helium gas circulating heating system |
| CN107992108A (en) * | 2018-01-08 | 2018-05-04 | 湖南震宇天然生物科技有限责任公司 | A kind of air conditioned storage control device and method |
| CN109026648A (en) * | 2018-08-27 | 2018-12-18 | 天津航天瑞莱科技有限公司 | A kind of medium volume flow regulator pumped at class products export |
| CN110608867A (en) * | 2019-10-30 | 2019-12-24 | 中国空气动力研究与发展中心低速空气动力研究所 | Large icing wind tunnel height simulation method |
| CN114458960B (en) * | 2022-02-16 | 2023-06-02 | 江西茂盛环境有限公司 | Waste gas removal system of modern factory |
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| CN1437044A (en) * | 2002-02-05 | 2003-08-20 | Lg.菲利浦Lcd株式会社 | LCD adhesion machine and method for producing LCD with the same adhering machine |
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