CN103727051A - Multi-branch accurate flow control system with large sucking rate - Google Patents
Multi-branch accurate flow control system with large sucking rate Download PDFInfo
- Publication number
- CN103727051A CN103727051A CN201410021964.4A CN201410021964A CN103727051A CN 103727051 A CN103727051 A CN 103727051A CN 201410021964 A CN201410021964 A CN 201410021964A CN 103727051 A CN103727051 A CN 103727051A
- Authority
- CN
- China
- Prior art keywords
- vacuum
- flew
- suction line
- tonifying
- air sucked
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Pipeline Systems (AREA)
- Flow Control (AREA)
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 vacuum equipment control field.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 need to be carried out in the environment of vacuum, but existing similar vacuum experiment is because the restriction of condition and experimental scale exists the problems such as rate of air sucked in required is little and the few precision of minute branch road is not high, and 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, provide a kind of and carry out vacuum pumping for large-scale vacuum system, can guarantee 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 that are connected with vacuum system, all branches suction line accesses main suction line simultaneously, in main suction line, be 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 unit, the main suction line of vacuum pump suction line one end access in parallel in vacuum unit, 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, in the water return pipeline of steam-water separator, be connected in series with waterback pump, 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 connected in series successively manual ball valve and is connected with the water intake of water ring vaccum pump with after electric switching valve, on inlet pipeline, be provided with raw water service pump simultaneously, motor is connected with water ring vaccum pump by speed reducer.
Described vacuum unit can be three groups.
Described tonifying Qi unit is the tonifying Qi pipeline of one or more parallel connection, on every tonifying Qi pipeline, is connected in series with respectively tonifying Qi modulating valve, at the end of every 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 being 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, is connected in series with successively flowmeter, the second vacuum gauge and pneumatic control valve on it.
Described flow is counted open channel flow amount meter.
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, high-tension switch cabinet U1 is connected with the DI module machine DO module of PLC slave station simultaneously, 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, motor starter U10 ~ U13 is connected with the DI module machine DO module of PLC slave station simultaneously, pneumatic positioner valve U14, flowmeter U15 and absolute pressure transmitter U16 are connected by the host CPU module of bus Profibus-DP1 YuPLC main website simultaneously, between PLC master station and follow station, by optical fiber, connect.
Described PLC main website model is S7-300, and 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 be carried 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 guarantee precise control of flew.
2, intrasystem flowmeter adopts conduit flowmeter, has the advantages such as output signal is large, permanent pressure loss is little, it is very stable to flow, antijamming capability is strong.
3, this control system can adopt conventional means to realize the operation that vacuum system is vacuumized, and controls the automatic adjusting of feasible system by corresponding software simultaneously, and application area is wider.
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 the large rate of air sucked in required multiple branch circuit precise control of flew system vacuum pump modular construction schematic diagram of bleeding.
Fig. 3 is large rate of air sucked in required multiple branch circuit precise control of flew system control principle drawing.
Wherein: 1, the first vacuum gauge 2, vacuum system 3, flowmeter 4, the 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, the 3rd vacuum gauge 11, the first pressure transmitter 12, main line modulating valve 13, the 4th vacuum gauge 14, the second pressure transmitter 15, main suction line 16, vacuum unit 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 ~ 3rd, most preferred embodiment of the present invention, 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, in vacuum system 2, be provided with the first vacuum gauge 1.In vacuum system 2 one sides, be connected with Duo Tiao branch suction line 6,1 pilot region in the corresponding vacuum system 2 of each branch's suction line 6 difference.In each branch's suction line 6, be connected in series with successively flowmeter 3, the second vacuum gauge 4 and pneumatic control valve 5, wherein flowmeter 3 adopts conduit flowmeter.From the Duo Tiao branch suction line 6 of drawing in vacuum system 2, import in main suction line 15, the flow in Mei Tiao branch suction line 6 can reach 3m simultaneously
3/ s, main suction line 15 is connected in parallel to tonifying Qi unit and 3 groups of vacuum units 16 simultaneously.In main suction line 15, between tonifying Qi unit and 3 groups of vacuum units 16, being connected in series with successively 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, the first pressure transmitters 11 and the second pressure transmitter 14 is absolute pressure sensor.Tonifying Qi unit is two tonifying Qi pipelines 7 in parallel, on every tonifying Qi pipeline 7, is connected in series with respectively tonifying Qi modulating valve 8, at the end of every tonifying Qi pipeline 7, is provided with filter screen 9.Vacuum unit 16 can arrange one or more groups as required, and tonifying Qi pipeline 7 can arrange one or many of being arranged side by side simultaneously as required.
As shown in Figure 2, the main suction line 15 of vacuum pump suction line 17 one end access in parallel in vacuum unit 16, the other end of vacuum pump suction line 17 is connected with the suction port of water ring vaccum pump 19 after being connected in series safety check 18, the relief opening of water ring vaccum pump 19 is connected with steam-water separator 20 by pipeline, the gas that is mingled with large quantity of moisture of being discharged by water ring vaccum pump 19 dry gas after steam-water separator 20 is discharged by gas exhaust piping 22, isolated water is reclaimed by water return pipeline 21, in water return pipeline 21, be connected in series with waterback pump (not shown in FIG.), 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 connected in series successively ball valve 24 and is connected with the water intake of water ring vaccum pump 19 with after electric switching valve 25, is provided with raw water service pump (not shown in FIG.) on inlet pipeline 23 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, and high-tension switch cabinet U1 is connected with the DI module machine DO module of PLC slave station simultaneously.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.Motor starter U10 ~ U13 is connected with the DI module machine DO module of PLC slave station simultaneously.Pneumatic positioner valve U14, flowmeter U15 and absolute pressure transmitter U16 are connected by the host CPU module of bus Profibus-DP1 YuPLC main website simultaneously.PLC main website is realized and being connected by the communication module in it respectively with PLC slave station.
In Fig. 3, three water ring vaccum pumps 19 in the corresponding 3 groups of vacuum units 16 of high pressure soft starting cabinet U2 ~ U4 difference, start respectively three water ring vaccum pumps 19 by high pressure soft starting cabinet U2 ~ U4.Electric valve actuator U5 is used for controlling main line modulating valve 12, and electric valve actuator U6 ~ U7 is respectively used to control two tonifying Qi modulating valve 8 in 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 being connected on inlet pipeline 23 is sent device.Motor starter U10 correspondence is connected with three inlet pipelines 23, the raw water service pump that is used to three water ring vaccum pumps 19 to supply water, and raw water service pump is connected with wet pit (not shown in FIG.); Waterback pump in motor starter U11 correspondence and three water return pipelines 21; The corresponding backwater stand by pump of motor starter U12.Motor starter U13 is the motor in cooling tower in system (not shown in FIG.), and in real system, three water return pipelines 21 are compiled in and are connected in series waterback pump behind a place and are connected with cooling tower water inlet.Pneumatic positioner valve U14 represents 16 identical pneumatic positioner valves, respectively 16 pneumatic control valves 5 in branch's suction line 6 of 16 corresponding above-mentioned DN200.Flowmeter U15 represents 18 flowmeters, respectively 18 platform trough road flowmeters in corresponding above-mentioned 18Tiao branch suction line 6.Corresponding the second pressure transmitter 14 of absolute pressure transmitter U16.
Specific works process and principle are as follows: when bringing into operation, first operator open each peripheral unit in native system by PLC, comprise by motor starter U13 and open the motor in cooling tower, by motor starter U10 and motor starter U11, start respectively raw water service pump and waterback pump.Then according to concrete Test item and requirement, set the quantity of the branch's suction line 6 that needs unlatching, and calculate respectively the inspiratory flow of Mei Tiao branch suction line 6.Then the inspiratory flow PLC by Mei Tiao branch suction line 6 calculates the interior air-breathing total discharge of main suction line 15, and by this total discharge, calculate the quantity of the water ring vaccum pump 19 of need opening, make total gettering quantity of the water ring vaccum pump 19 of all unlatchings be greater than the total discharge in main suction line 15.Then by PLC, open one or more in high pressure soft starting cabinet U2 ~ U4, pneumatic control valve 5 in branch's suction line 6 of simultaneously by pneumatic positioner valve U14, needs being opened is opened to corresponding aperture, does not need branch's suction line 6 of opening to close.Now by PLC, open electric valve actuator U5 ~ U7, by electric valve actuator U5 ~ U7, start the aperture of main line modulating valve 12 and two tonifying Qi modulating valve 8.
Now, the first pressure transmitter 11 in tonifying Qi modulating valve 8 and main suction line 15 and the second pressure transmitter 14 and two tonifying Qi modulating valve 8 form pid loops, guarantee that pressure of inspiration(Pi) is stabilized in the scope of technical requirements; Pneumatic control valve 5 and flowmeter 3(flowmeter U15 in each branch's suction line 6 of while) composition pid loop, carry out at any time from adjusting, arbitrary branch road changes, and other branch road is adjusted simultaneously, guarantees that the flow of each branch road is within the scope of technical requirements.
When system is moved, 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, by DO module, each equipment is sent to control signal simultaneously.
PLC main website model is S7-300 in the present invention, and slave station model is ET200M, and PLC connects by optical fiber between master and slave station.In PLC main website, be connected with control panel simultaneously.
The above, be only preferred embodiment of the present invention, is not the present invention to be done to the restriction of other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not depart from, any simple modification, equivalent variations and the remodeling above embodiment done according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (10)
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: comprise many branch's suction line (6) that are connected with vacuum system (2), all branches suction line (6) access main suction line (15) simultaneously, main suction line is connected in parallel to tonifying Qi unit, Pressure testing regulon and vacuum unit on (15) successively, and tonifying Qi unit, Pressure testing regulon and vacuum unit are controlled by control circuit.
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 vacuum unit is one or more groups vacuum unit (16), vacuum pump suction line (17) one end access in parallel main suction line (15) in vacuum unit (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, in the water return pipeline (21) of steam-water separator (20), be connected in series with waterback pump, 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 connected in series successively manual ball valve (24) and is connected with the water intake of water ring vaccum pump (19) afterwards with electric switching valve (25), on inlet pipeline (23), be provided with raw water service pump simultaneously, motor (26) is connected with water ring vaccum pump (19) by speed reducer (27).
3. large rate of air sucked in required multiple branch circuit precise control of flew system according to claim 2, is characterized in that: described vacuum unit (16) can be three groups.
4. 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, on every tonifying Qi pipeline (7), be connected in series with respectively tonifying Qi modulating valve (8), at the end of every tonifying Qi pipeline (7), be provided with filter screen (9).
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 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) being arranged between tonifying Qi unit and vacuum unit.
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 the first pressure transmitter (11) and the second pressure transmitter (14) are absolute pressure transmitter.
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: described branch's suction line (6) is many, is connected in series with successively flowmeter (3), the second vacuum gauge (4) and pneumatic control valve (5) on it.
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 flowmeter (3) is conduit flowmeter.
9. 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, high-tension switch cabinet U1 is connected with the DI module machine DO module of PLC slave station simultaneously, 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, motor starter U10 ~ U13 is connected with the DI module machine DO module of PLC slave station simultaneously, pneumatic positioner valve U14, flowmeter U15 and absolute pressure transmitter U16 are connected by the host CPU module of bus Profibus-DP1 YuPLC main website simultaneously, between PLC master station and follow station, by optical fiber, connect.
10. large rate of air sucked in required multiple branch circuit precise control of flew system according to claim 9, is characterized in that: described PLC main website model is S7-300, and PLC slave station model is ET200M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410021964.4A CN103727051B (en) | 2014-01-18 | 2014-01-18 | Multi-branch accurate flow control system with large sucking rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410021964.4A CN103727051B (en) | 2014-01-18 | 2014-01-18 | Multi-branch accurate flow control system with large sucking rate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103727051A true CN103727051A (en) | 2014-04-16 |
| CN103727051B CN103727051B (en) | 2015-05-13 |
Family
ID=50451286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410021964.4A Active CN103727051B (en) | 2014-01-18 | 2014-01-18 | Multi-branch accurate flow control system with large sucking rate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103727051B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114458960A (en) * | 2022-02-16 | 2022-05-10 | 江西茂盛环境有限公司 | Waste gas removing system of modern factory |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030019124A1 (en) * | 2000-02-23 | 2003-01-30 | Shunji Miyakawa | Vacuum drying apparatus and vacuum drying method |
| 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 |
| CN200974946Y (en) * | 2006-09-29 | 2007-11-14 | 上海鲜绿真空保鲜设备有限公司 | Vacuum peculiar smell removing equipment |
| CN102023654A (en) * | 2010-12-23 | 2011-04-20 | 北京航空航天大学 | Large environment simulation laboratory pressure control system and control method thereof |
| CN102414775A (en) * | 2009-02-22 | 2012-04-11 | 迈普尔平版印刷Ip有限公司 | Method and arrangement for realizing vacuum in vacuum chamber |
| JP5004189B2 (en) * | 2008-06-13 | 2012-08-22 | 株式会社名機製作所 | Vacuum degree control mechanism and degree control method of vacuum chamber |
-
2014
- 2014-01-18 CN CN201410021964.4A patent/CN103727051B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030019124A1 (en) * | 2000-02-23 | 2003-01-30 | Shunji Miyakawa | Vacuum drying apparatus and vacuum drying method |
| 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 |
| CN200974946Y (en) * | 2006-09-29 | 2007-11-14 | 上海鲜绿真空保鲜设备有限公司 | Vacuum peculiar smell removing equipment |
| JP5004189B2 (en) * | 2008-06-13 | 2012-08-22 | 株式会社名機製作所 | Vacuum degree control mechanism and degree control method of vacuum chamber |
| CN102414775A (en) * | 2009-02-22 | 2012-04-11 | 迈普尔平版印刷Ip有限公司 | Method and arrangement for realizing vacuum in vacuum chamber |
| CN102023654A (en) * | 2010-12-23 | 2011-04-20 | 北京航空航天大学 | Large environment simulation laboratory pressure control system and control method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114458960A (en) * | 2022-02-16 | 2022-05-10 | 江西茂盛环境有限公司 | Waste gas removing system of modern factory |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103727051B (en) | 2015-05-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103727051B (en) | Multi-branch accurate flow control system with large sucking rate | |
| CN103808569A (en) | High-pressure fatigue test device and test method | |
| CN204598878U (en) | A kind of road green belt photovoltaic automatic drop irrigation device | |
| CN105134545A (en) | Water drawing device and water drawing method using water drawing device | |
| CN103727036B (en) | Precise adjustment system for vacuum degree of giant vacuum chamber | |
| CN204357841U (en) | A kind of cleaning oil-sealing testing apparatus | |
| CN104803196A (en) | Vacuum pipeline system | |
| CN204401535U (en) | A kind of tower crane Intelligent spraying system | |
| CN103471190B (en) | A kind of integrated system of integrated refrigeration station and integrated approach | |
| CN104295899A (en) | 8-well-type heating and separating integrated device | |
| CN103882909A (en) | Area-dividing and pressure-dividing device of water supplying system | |
| RU2500926C2 (en) | Control system of process gas losses of gas-dynamic seals | |
| CN202954982U (en) | Water supply device of centrifugal pump | |
| CN203894662U (en) | Temperature control system of information machine room | |
| CN204140352U (en) | A kind of dry-type centrifugal pump pump valve linkage control device | |
| CN203311280U (en) | Power-plant high-pressure heater liquid level switch self-cooling device | |
| CN204211627U (en) | A kind of skull melting furnace bubble systems | |
| CN203784636U (en) | One-button type nitrogen replacement device | |
| CN202610877U (en) | Automatic shifting device with two water sources | |
| CN104696705B (en) | Intelligent Dynamic lays in the gas storage control system and method for biogas | |
| CN103163787A (en) | Circuit control system used for rain damage test box | |
| CN208167864U (en) | A kind of ultrapure water washer water system | |
| CN204746683U (en) | Aqueous vapor drive arrangement is used in spraying | |
| CN204026146U (en) | A kind of 8 well formula heating isolation integral integrated devices | |
| CN204437716U (en) | A kind of novel gas differential pressure type adds smelly system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |