CN103967763A - Speed control device and method for two-stage tandem pumps - Google Patents
Speed control device and method for two-stage tandem pumps Download PDFInfo
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- CN103967763A CN103967763A CN201310039437.1A CN201310039437A CN103967763A CN 103967763 A CN103967763 A CN 103967763A CN 201310039437 A CN201310039437 A CN 201310039437A CN 103967763 A CN103967763 A CN 103967763A
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- pump
- plc
- speed
- pressure
- active efflux
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- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a speed control device and a speed control method for two-stage tandem pumps in the technical field of control over tandem pumps. The method comprises the following steps of transmitting a half of a set pressure value and a half of an actual pressure value detected by a pressure sensor to a driving pump to drive the driving pump to rotate by using a PLC (programmable logic controller); driving a driven pump to rotate by taking the rotating speed of the driving pump as the set speed of the driven pump; transmitting the detected pressure value to the PLC by using the pressure sensor, and recontrolling the driving pump by using the PLC. According to the device and the method, the driving pump and the driven pump are controlled by the PLC in real time, so that stable outlet pressure can be rapidly generated by a CDS (chemical delivery system), the driving pump and the driven pump can stably run with low noise, the utilization efficiency of the driving pump and the driven pump is improved, and the service life of the driving pump and the driven pump is prolonged.
Description
Technical field
The present invention relates to pumps in series control technique field, particularly a kind of control gear of two-stage tandem pump speed and method.
Background technique
Magnetic drive pump is the source of CDS system dynamic, in apparatus and process process, medicinal liquid flow be there are certain requirements, and CDS need to provide sufficiently stable medicine liquid outlet pressure, conventionally adopts the method for two-stage tandem pump for this reason.Magnetic drive pump is under pressure pattern, and two pumps carry out speed adjusting with reference to outlet pressure, and simultaneously speedup or deceleration finally reaches the liquid pressure of device requirement.But due to the speed of response of pump and the fine distinction in installation process, when the speed of two pumps regulates automatically, increment has nuance, pump speed changes inconsistent, long-time accumulation can cause the speed difference of two pumps increasing, can have a strong impact on like this utilization efficiency and the life-span of pump, and affect the stability that CDS system liquid is supplied with.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: how a kind of stable two-stage tandem apparatus for controlling pump and method are provided, make CDS system can provide stable liquid to supply with.
(2) technological scheme
For solving the problems of the technologies described above, the invention provides a kind of control gear of two-stage tandem pump speed, it is characterized in that, this device comprises active efflux, slave pump, pressure transducer and PLC, PLC is connected with active efflux, slave pump and pressure transducer respectively.
A controlling method for two-stage tandem pump speed, is characterized in that, the method comprises the following steps:
S1: the actual pressure value of half that described PLC detects the setup pressure value of half and described pressure transducer sends to described active efflux rotates active efflux;
The speed that S2:PLC rotates described active efflux drives slave pump to rotate as the setting speed of described slave pump;
S3: described pressure transducer sends to PLC by the force value detecting, returns to step S1.
The cycle of described sensor detected pressures value is 50ms.
(3) beneficial effect
The inventive method is carried out the control of series connection speed by PLC and pressure transducer to active efflux and slave pump, makes the rotating speed of slave pump follow the rotating speed of active efflux.The actual pressure value of half that PLC detects the setup pressure value of half and pressure transducer sends to active efflux rotates active efflux; The speed that active efflux is rotated drives slave pump to rotate as the setting speed of slave pump; Make active efflux and the rotating speed of slave pump and the pressure of generation consistent as far as possible; Pressure transducer sends to PLC by the force value detecting, and PLC controls active efflux again, realizes the real-time control to active efflux and slave pump.The present invention can make CDS system produce fast stable outlet pressure, and outlet liquid flows mild; Active efflux and slave pump operate steadily, and noise is little, have increased utilization efficiency and the life-span of active efflux and slave pump.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
In order to solve the low and short problem of life-span of the utilization efficiency of pump in existing two-stage tandem method for controlling pump, the present invention has adopted the method for active efflux pressure pattern, slave pump velocity mode, by the return of value of active efflux speed, be assigned to slave pump and be used as input value, thereby realize pump and by reference to outlet pressure, realize the function of automatic adjusting, and realize the synchronous interaction of two stage pump.
Pressure and rotating speed that magnetic drive pump outlet end produces have coherence, and rotating speed is larger, and the pressure of its outlet end is larger; When two series connections of pumps are got up while moving simultaneously, the desired pressure of its generation should double (actual pressure is in 90% left and right).When magnetic drive pump moves under pressure pattern, need to first set reference pressure, and by pressure transducer, actual pressure be fed back to pump, pump, by regulating the speed, is finally realized coincideing of actual pressure and reference pressure.In pumps in series system, if two pumps all reference settings force value carry out the automatic adjusting of speed, velocity curve separately may have trickle inconsistent, both synthetic outlet pressures that produce are by convergence and setting value, this will show as a pump speed piece, another is slow, but whole pressure meets the demands.During long-time running, the speed difference between two pumps is likely increasing, no matter be the manufacturing process for equipment,, for the maintenance of pump itself, is still all unacceptable.So pumps in series system adopts the rotating speed method of following active efflux of slave pump, makes two pump speed consistent, and use pressure feedback to carry out speed adjusting, can effectively address this problem.Introduce again concrete implementation method below.
As shown in Figure (1) shows, basic principle is first by PLC, to issue 1/2 times of setup pressure value (P to the general diagram of pumps in series system
0/ 2) and 1/2 times of actual pressure value (P detecting of pressure transducer
v/ 2), to active efflux, main pump calculates motion speed by the pid algorithm carrying and starts action, and by motion speed (V
1) return to PLC, then PLC is by the motion speed (V of active efflux
1) as the setting speed (V of slave pump
0), slave pump brings into operation, and produces like this one and synthesizes mouth pressure, by pressure transducer, new pressure (P detected
v') return to PLC, constantly cycle detection, regulates the speed, and finally makes outlet pressure be stabilized in setting value (P
0).Due to the required time minimum (about 50ms) of one of PLC system circulation, so that the speed of two pumps can be regarded as is completely synchronous, so both realized the stable control of pressure feedback, realized again pumps in series synchronously.
The inventive method is carried out the control of series connection speed by PLC and pressure transducer to active efflux and slave pump, makes the rotating speed of slave pump follow the rotating speed of active efflux.The actual pressure value of half that PLC detects the setup pressure value of half and pressure transducer sends to active efflux rotates active efflux; The speed that active efflux is rotated drives slave pump to rotate as the setting speed of slave pump; Make active efflux and the rotating speed of slave pump and the pressure of generation consistent as far as possible; Pressure transducer sends to PLC by the force value detecting, and PLC controls active efflux again, realizes the real-time control to active efflux and slave pump.The present invention can produce highly stable outlet pressure very soon, and outlet liquid flows mild; Active efflux and slave pump operate steadily, and noise is little, have increased utilization efficiency and the life-span of active efflux and slave pump.
Above mode of execution is only for illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technological schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (3)
1. a control gear for two-stage tandem pump speed, is characterized in that, this device comprises active efflux, slave pump, pressure transducer and PLC, and PLC is connected with active efflux, slave pump and pressure transducer respectively.
2. a controlling method of utilizing the two-stage tandem pump speed of device described in claim 1, is characterized in that, the method comprises the following steps:
S1: the actual pressure value of half that described PLC detects the setup pressure value of half and described pressure transducer sends to described active efflux rotates active efflux;
The speed that S2:PLC rotates described active efflux drives slave pump to rotate as the setting speed of described slave pump;
S3: described pressure transducer sends to PLC by the force value detecting, returns to step S1.
3. method according to claim 2, is characterized in that, the cycle of described sensor detected pressures value is 50ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310039437.1A CN103967763B (en) | 2013-01-31 | 2013-01-31 | A kind of control gear of two-stage tandem pump speed and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310039437.1A CN103967763B (en) | 2013-01-31 | 2013-01-31 | A kind of control gear of two-stage tandem pump speed and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103967763A true CN103967763A (en) | 2014-08-06 |
| CN103967763B CN103967763B (en) | 2016-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310039437.1A Active CN103967763B (en) | 2013-01-31 | 2013-01-31 | A kind of control gear of two-stage tandem pump speed and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112324648A (en) * | 2020-11-02 | 2021-02-05 | 山东悟空仪器有限公司 | Control method of pressure balance point of serial plunger pump and serial plunger pump |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5713727A (en) * | 1993-12-09 | 1998-02-03 | Westinghouse Electric Corporation | Multi-stage pump powered by integral canned motors |
| US20050061722A1 (en) * | 2003-09-18 | 2005-03-24 | Kunihiko Takao | Pump, pump for liquid chromatography, and liquid chromatography apparatus |
| CN101213370A (en) * | 2005-07-20 | 2008-07-02 | 阿尔卡特朗讯公司 | Fast energy-saving chamber pumping |
| CN201382044Y (en) * | 2009-03-11 | 2010-01-13 | 江门市蒙德电气有限公司 | Hydraulic multi-pump parallel control device for servo |
| CN101865108A (en) * | 2008-04-02 | 2010-10-20 | 流量仪表股份公司 | Have the reciprocating pump of force transducer and be used to control the method for described reciprocating pump |
-
2013
- 2013-01-31 CN CN201310039437.1A patent/CN103967763B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5713727A (en) * | 1993-12-09 | 1998-02-03 | Westinghouse Electric Corporation | Multi-stage pump powered by integral canned motors |
| US20050061722A1 (en) * | 2003-09-18 | 2005-03-24 | Kunihiko Takao | Pump, pump for liquid chromatography, and liquid chromatography apparatus |
| CN101213370A (en) * | 2005-07-20 | 2008-07-02 | 阿尔卡特朗讯公司 | Fast energy-saving chamber pumping |
| CN101865108A (en) * | 2008-04-02 | 2010-10-20 | 流量仪表股份公司 | Have the reciprocating pump of force transducer and be used to control the method for described reciprocating pump |
| CN201382044Y (en) * | 2009-03-11 | 2010-01-13 | 江门市蒙德电气有限公司 | Hydraulic multi-pump parallel control device for servo |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112324648A (en) * | 2020-11-02 | 2021-02-05 | 山东悟空仪器有限公司 | Control method of pressure balance point of serial plunger pump and serial plunger pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103967763B (en) | 2016-03-02 |
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