CN103092222A - Pressure precise adjustment device - Google Patents
Pressure precise adjustment device Download PDFInfo
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- CN103092222A CN103092222A CN2012105863056A CN201210586305A CN103092222A CN 103092222 A CN103092222 A CN 103092222A CN 2012105863056 A CN2012105863056 A CN 2012105863056A CN 201210586305 A CN201210586305 A CN 201210586305A CN 103092222 A CN103092222 A CN 103092222A
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- pressure
- processor
- sensing element
- chamber
- making
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
Abstract
The invention relates to a pressure precise adjustment device. The device comprises an elastic sensitive element, an elastic deformation conversion device, a steeping motor, an actuator, a coarse regulating mechanism, a processor, a touch screen, an analog digital converter, a pressure sensor and a press producing cavity. The press producing cavity is communicated with a cavity of an elastic sensitive element, and pressure inside the cavities is identical. The pressure sensor senses pressure in the press producing cavity, output electric signals are collected by the analog digital converter and are calculated by the processor, and a real pressure value is achieved. The processor adopts a double closed-loop PI control algorithm through comparing a pressure preset value input by the touch screen with an error value of pressure current value of real-time detection. Firstly the coarse regulating mechanism of an inner ring is controlled to conduct coarse regulating quickly, then veer and angles of the steeping motor of an outer ring are controlled, and an effect of regulating pressure precisely can be achieved by the elastic deformation conversion device changing the cavity size of the elastic sensitive element. A pressure regulating control system of the pressure precise adjustment device is high in accuracy, short in regulating time, low in cost and extensive in applicability.
Description
Technical field
The present invention relates to a kind of industrial control field, be specifically related to a kind of pressure device for precisely regulating.
Background technology
Pressure survey occupies critical role in industrial process is controlled, the performance of pressure calibration device has determined calibration accuracy, efficient and the cost of manometer.Full-automatic pressure calibration instrument is high, applied widely because of its precision, easy operating, and function is integrated, and the small and exquisite many merits that waits of volume just progressively replaces traditional piston gage, is widely used in the fields such as electric power, oil, petrochemical industry, metallurgy, pharmacy.
Full-automatic pressure calibration instrument mainly is divided into air pressure tester and hydraulic pressure tester according to the difference of tested instrument.The air pressure tester often is used for calibrating the manometer of range less take noncorrosive gases as actuating medium.Conventional air pressure tester utilizes opening/break to control and making air inflow and the air output of pressing in the chamber of solenoid valve, then reaches the purpose of adjusting pressure, and its structure is as shown in Fig. 1 C.The hydraulic pressure tester often is used for calibrating the relatively large manometer of range take non-electrically conductive liquids such as transformer oil, decanedioic acid fat, deionized waters as actuating medium.Conventional hydraulic pressure tester utilizes motor or gas push piston to move in oil cylinder, changes the volume of actuating medium in oil cylinder, then reaches the purpose of regulating pressure, sees Figure 1A and Figure 1B.
At present, Full-automatic pressure calibration instrument makes the performance of pressing precision mainly to be limited by pressure transducer and topworks.The machining precision of topworks, the consistance of components and parts and processing purchase cost have determined the quality of topworks's performance.
In traditional baric systerm, the response time of solenoid valve is mostly at 10～30ms, the better 5～10ms that also wants, and also price is comparatively expensive, and consistance is difficult to guarantee.The gas flow of the minimum switch gap of solenoid valve has often determined the precision of air pressure adjustment.Pressure reduction by reducing solenoid valve two ends tends to increase the complicacy of system to reducing the gas flow of minimum switch gap, causes the raising of cost.Reduce the latus rectum of solenoid valve, although can reduce the gas flow of minimum switch gap, also increased the adjusting time simultaneously.Increase and make the volume of pressing cavity, can be because of the cavity volume effect, the vibration of aggravation gas also can increase the adjusting time.In traditional hydraulic system, for by the making for pressing system of motor pushing piston, the machining precision of turn-screw can affect the displacement of motor unit's step-length lower piston, then affects the resolving power of pressure regulation.And high-precision leading screw is often expensive, is difficult for processing.Supporting motor also need be selected stepper motor or the servomotor that high resolving power, moment of torsion are stable, heating is less with it, further improves the cost of system.Push away the pressing system of making of liquid for gas, have a difficult problem similar to baric systerm.
Summary of the invention
In view of this, the purpose of this invention is to provide the control system that the pressure minute adjustment is carried out in a kind of deformation that utilizes elastic sensing element, to reduce the performance requirement to conventional governor motion, simplied system structure improves and makes the pressure precision.
For achieving the above object, the present invention has adopted following technical characterictic:
On the one hand, the embodiment of the present invention provides a kind of pressure device for precisely regulating, comprising:
Topworks (1), it comprises elastic sensing element (3), elastic deformation conversion equipment (4), stepper motor and driver (5), slightly presses governor motion (6) and make and press chamber (11), described making presses the cavity of chamber (11) and described elastic sensing element (3) to communicate, and inside cavity pressure equates;
control gear (2), it comprises processor (7), touch-screen (8), analog-digital converter (9), pressure transducer (10), the described pressure of pressing in chamber (11) of making of described pressure transducer (10) sensing, output electrical signals, described electric signal is after described analog-digital converter (9) conversion, resolved by described processor (7), after obtaining the current pressure value, described processor (7) is by comparing the user by the pressure set points of described touch-screen (8) input and the error amount of pressure currency, with described error amount and specification error threshold ratio after, described topworks (1) is carried out two closed-loop controls, regulate the described pressure of pressing in chamber (11) of making.
According to the described pressure device for precisely regulating of preferred embodiment of the present invention, described pair of closed-loop control further comprises:
In the time of outside error amount is in described specification error threshold interval, ring in described processor (7) starts is controlled described thick pressure governor motion (6) and is carried out fast slightly pressing regulating;
In the time of within described error amount is in described specification error threshold interval, described processor (7) starts outer shroud, control the turning to of described stepper motor and driver (5), angle, change the cavity volume of described elastic sensing element (3) by described elastic deformation conversion equipment (4), to regulate the described pressure of pressing in chamber (11) of making.
According to the described pressure device for precisely regulating of preferred embodiment of the present invention, in the time of within described error amount is in described specification error threshold interval, described processor (7) starts outer shroud, control the turning to of described stepper motor and driver (5), angle, change the cavity volume of described elastic sensing element (3) by described elastic deformation conversion equipment (4), to regulate the described pressure of pressing in chamber (11) of making, further comprise:
When needs raise the described pressure of making in pressure chamber (11), reduce the cavity volume of described elastic sensing element (3);
When needs reduce the described pressure of making in pressure chamber (11), increase the cavity volume of described elastic sensing element (3).
According to the described pressure device for precisely regulating of preferred embodiment of the present invention, described elastic sensing element (3) is bourdon tube, corrugated tube or flexible sheet.
According to the described pressure device for precisely regulating of preferred embodiment of the present invention, described pressure transducer (10) is silicon piezoresistance type pressure sensor, resonance type pressure sensor, capacitance pressure transducer.
According to the described pressure device for precisely regulating of preferred embodiment of the present invention, described analog-digital converter (9) is ∑-Δ type simulated digital quantizer.
Owing to having adopted above technical characterictic, make the present invention than prior art, have following advantage and good effect:
The present invention's advantage compared with prior art is:
(1) the present invention adopts the conventional pressure regulating device of interior ring and the collaborative work of outer shroud elastic sensing element mechanism, by changing the volume of elastic sensing element cavity, has realized that high-precision pressure stability regulates, and is applicable to simultaneously air pressure and hydraulic pressure two kinds of systems;
(2) the present invention adopts two closed loop PI control methods, makes thick pressure governor motion and the collaborative work of elastic sensing element mechanism, reaches fast stable set pressure.In the time of namely outside error amount is in the specification error threshold interval, start the thick governor motion rapid pressure adjusting of pressing; In the time of within error amount is in the specification error threshold interval, starts elastic sensing element mechanism and carry out accurate voltage regulating.In inside and outside two PI links, when error amount was in outside separately specification error threshold interval, governor motion was with the highest governing speed pressure regulation, in case within error amount entered the specification error threshold interval, operation parameter was from adjusting the pressure regulation of PI control method.For improving the performance of closed-loop control system, shorten the response time, make and make pressing system and reach as early as possible stable set pressure, at inside and outside two rings, according to the error amount size, suitably adjust the coefficient of each link of PI controller, than common PI control method, greatly shorten the response time, improved antijamming capability;
(3) the present invention is simple in structure, and the elastic sensing element mechanism design is flexible, and is lower to conventional pressure regulating device manufacturing accuracy, the coherence request that coordinates with it, also reduced cost simultaneously, has certain marketing potentiality.
Description of drawings
Figure 1A is the hydraulic regulator figure that utilizes the motor pushing piston;
Figure 1B is the hydraulic regulator figure that utilizes the gas push piston;
Fig. 1 C is the Pneumatic adjusting mechanism figure that utilizes solenoid control air inflow, air output;
The structured flowchart of the pressure device for precisely regulating that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 A is elastic sensing element in an embodiment of the present invention and the schematic diagram of elastic deformation conversion equipment thereof;
Fig. 3 B is elastic sensing element in the another kind of embodiment of the present invention and the schematic diagram of elastic deformation conversion equipment thereof;
Fig. 4 is processor realization flow figure in the embodiment of the present invention;
Fig. 5 is the principle schematic that in embodiments of the invention, processor adopting parameter self-tuning PI controls.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Below in conjunction with accompanying drawing, the embodiment of the present invention is done being described in further detail.
As shown in Figure 2, the embodiment of the present invention provides a kind of pressure device for precisely regulating, as seen from the figure.Described device comprises:
Topworks (1), it comprises elastic sensing element (3), elastic deformation conversion equipment (4), stepper motor and driver (5), slightly presses governor motion (6) and make and press chamber (11), described making presses the cavity of chamber (11) and described elastic sensing element (3) to communicate, and inside cavity pressure equates;
control gear (2), it comprises processor (7), touch-screen (8), analog-digital converter (9), pressure transducer (10), the described pressure of pressing in chamber (11) of making of described pressure transducer (10) sensing, output electrical signals, described electric signal is after described analog-digital converter (9) conversion, resolved by described processor (7), after obtaining the current pressure value, described processor (7) is by comparing the user by the pressure set points of described touch-screen (8) input and the error amount of pressure currency, with described error amount and specification error threshold ratio after, described topworks (1) is carried out two closed-loop controls, regulate the described pressure of pressing in chamber (11) of making.
More particularly, the embodiment of the present invention provides the device that the pressure minute adjustment is carried out in a kind of deformation that utilizes elastic sensing element, wherein, elastic sensing element 3, elastic deformation conversion equipment 4, stepper motor and driver 5 have formed the accurate voltage regulating topworks of core: as Fig. 3 A, turning to and moment of driver control stepper motor 5, change the deformation of bourdon tube by the deformation conversion equipment, then changed the volume of bourdon tube cavity and actuating medium.Motor shaft clockwise rotates, and cavity reduces, and pressure becomes large.Motor shaft rotates counterclockwise, and cavity increases, and pressure diminishes.As Fig. 3 B, driver control stepper motor 5 pushes away or draws moving bar piece by leading screw, has then changed the volume of corrugated tube cavity and actuating medium.When promoting moving bar piece to left movement, corrugated tube is compressed, and cavity reduces, and pressure becomes large.When pulling moving bar piece to move right, corrugated tube is stretched, and cavity increases, and pressure reduces.The control gear that pressure transducer 10, analog-digital converter 9, processor 7 form, or title control circuit, can be by two closed loop PI control methods, control the thick governor motion 6 of pressing, control simultaneously driver drives stepper motor 5, the deformation of the elastic sensing element 3 that changes makes both co-ordinations, realizes stable, pressure regulation rapidly.
Elastic sensing element of the present invention can be selected bourdon tube, the corrugated tube as shown in Fig. 3 B or flexible sheet etc. as shown in Figure 3A, is aided with simple elastic deformation conversion equipment.Processor 7 can be by the deformation of stepper motor and driver control elastic sensing element.The cavity volume of elastic sensing element should be coordinated mutually with the whole cumulative volume of making hydraulic circuit, and too little range of regulation is less than normal, does not have too greatly the effect of accurate voltage regulating.Also to consider simultaneously the pressure regulation resolving power of thick pressure governor motion.
As shown in Figure 4, processor 7 of the present invention receives by touch-screen 8 pressure set points that the user arranges, and pressure transducer 10 sensitivities are made the force value of pressing in chamber 11, gathers through analog-digital converter 9, is resolved by processor 7 and obtains the pressure currency.
As shown in Figure 5, in the embodiment of the present invention, processor 7 adopts two closed loop parameter self-tuning PI control methods that pressure is controlled.Processor according to the error amount size, is adjusted Proportional coefficient K p and the integral coefficient Ki of PI link by the PI control algolithm.Output and error originated from input value that Kp controls are proportional, are used for responding fast; The output that Ki controls and error amount be integrated into proportional relation, be used for eliminating steady-state error.Namely when Error Absolute Value large (get in the present invention greater than inner and outer rings input value 20%), Kp gets higher value (the present invention gets 25), Ki gets zero, and this moment, thick pressure governor motion 6 or elastic sensing element 3 mechanism's rapid pressure adjustings or deformation fast, made Error Absolute Value reduce as early as possible; When Error Absolute Value be median size (get in the present invention greater than the inner and outer rings input value 10% less than the inner and outer rings input value 20%) time, Kp gets medium value (the present invention gets 20), Ki gets smaller value (the present invention gets 0.0005), this moment, thick speed of pressing governor motion 6 or elastic sensing element 3 mechanisms reduction pressure regulation or deformation, prevented overshoot; When Error Absolute Value continue to reduce (the present invention get greater than the inner and outer rings input value 5% less than the inner and outer rings input value 10%) time, Kp should get smaller value (the present invention gets 5), Ki gets medium value (the present invention gets 0.01), slowly regulates the deformation of thick pressure actuator 6 or elastic sensing element 3 this moment; When Error Absolute Value reach minimum (the present invention get less than the outer shroud input value 5%) time, Kp should get medium value (the present invention gets 10), Ki gets maximal value (the present invention gets 0.02), and be mainly the fine deformation of adjustable elastic sensitive element 3 this moment, reaches the effect of accurate voltage regulating.Above process makes the response rapidly of inside and outside two rings, thereby makes double loop system can reach sooner stable set pressure, and the method is faster than traditional PI control method response speed.
In a kind of possible embodiment, consider that the electric signal of pressure transducer 10 outputs is generally the tiny signal of uA, mV level, and making the pressure signal of pressing in chamber 11 can not suddenly change the short time, therefore the ∑ of recommend adoption high resolving power, high s/n ratio, high integration-Δ type simulated digital quantizer 9, for example AD7714.
The set pressure of user's input can be by touch-screen or simply button, charactron realization.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above is only the specific embodiment of the present invention; the protection domain that is not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. pressure device for precisely regulating, its characteristic is, comprising:
Topworks (1), it comprises elastic sensing element (3), elastic deformation conversion equipment (4), stepper motor and driver (5), slightly presses governor motion (6) and make and press chamber (11), described making presses the cavity of chamber (11) and described elastic sensing element (3) to communicate, and inside cavity pressure equates;
control gear (2), it comprises processor (7), touch-screen (8), analog-digital converter (9), pressure transducer (10), the described pressure of pressing in chamber (11) of making of described pressure transducer (10) sensing, output electrical signals, described electric signal is after described analog-digital converter (9) conversion, resolved by described processor (7), after obtaining the current pressure value, described processor (7) is by comparing the user by the pressure set points of described touch-screen (8) input and the error amount of pressure currency, with described error amount and specification error threshold ratio after, described topworks (1) is carried out two closed-loop controls, regulate the described pressure of pressing in chamber (11) of making.
2. pressure device for precisely regulating as claimed in claim 1, is characterized in that, described pair of closed-loop control further comprises:
When error amount was in outside described setting threshold interval, ring in described processor (7) starts was controlled described thick pressure governor motion (6) and is carried out fast the thick adjusting of pressing;
When described error amount is within described error threshold interval, described processor (7) starts outer shroud, control the turning to of described stepper motor and driver (5), angle, change the cavity volume of described elastic sensing element (3) by described elastic deformation conversion equipment (4), to regulate the described pressure of pressing in chamber (11) of making.
3. pressure device for precisely regulating as claimed in claim 2, it is characterized in that, it is described when described error amount is within described error threshold interval, described processor (7) starts outer shroud, control turning to of described stepper motor and driver (5), angle, change the cavity volume of described elastic sensing element (3) by described elastic deformation conversion equipment (4), to regulate the described pressure of pressing in chamber (11) of making, further comprise: when needs raise the described pressure of making in pressure chamber (11), reduce the cavity volume of described elastic sensing element (3), when needs reduce the described pressure of making in pressure chamber (11), increase the cavity volume of described elastic sensing element (3).
4. pressure device for precisely regulating as claimed in claim 1, is characterized in that, described elastic sensing element (3) is bourdon tube, corrugated tube or flexible sheet.
5. pressure device for precisely regulating as described in claim 1-4 any one, is characterized in that, described pressure transducer (10) is silicon piezoresistance type pressure sensor, resonance type pressure sensor, capacitance pressure transducer.
6. pressure device for precisely regulating as described in claim 1-5 any one, is characterized in that, described analog-digital converter (9) is ∑-Δ type simulated digital quantizer (9).
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210586305.6A CN103092222B (en) | 2012-12-31 | 2012-12-31 | A kind of pressure precise adjustment device |
| CA2837786A CA2837786A1 (en) | 2012-12-31 | 2013-12-19 | Apparatus for precise pressure adjustment |
| PCT/CN2013/090202 WO2014101728A1 (en) | 2012-12-31 | 2013-12-23 | Device for precisely adjusting pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210586305.6A CN103092222B (en) | 2012-12-31 | 2012-12-31 | A kind of pressure precise adjustment device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103092222A true CN103092222A (en) | 2013-05-08 |
| CN103092222B CN103092222B (en) | 2016-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210586305.6A Active CN103092222B (en) | 2012-12-31 | 2012-12-31 | A kind of pressure precise adjustment device |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN103092222B (en) |
| CA (1) | CA2837786A1 (en) |
| WO (1) | WO2014101728A1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014101728A1 (en) * | 2012-12-31 | 2014-07-03 | Sun Xiaojun | Device for precisely adjusting pressure |
| WO2014106437A1 (en) * | 2013-01-04 | 2014-07-10 | 北京银谷科讯信息技术有限公司 | Pressure adjusting device |
| CN111381614A (en) * | 2020-03-26 | 2020-07-07 | 杭州汇健科技有限公司 | Pressure micro-control device for in-situ collection of molecules on surface of sample, and operation method and use method thereof |
| CN112032380A (en) * | 2020-08-25 | 2020-12-04 | 中车青岛四方车辆研究所有限公司 | Pressure reducing device and closed-loop control method for pressure output regulation of pressure reducing device |
| CN112945461A (en) * | 2021-02-02 | 2021-06-11 | 同济大学 | Multifunctional pressure gauge automatic test system, method and device |
| WO2024021748A1 (en) * | 2022-07-27 | 2024-02-01 | 领航基因科技（杭州）有限公司 | Droplet preparation device and method |
| US11964271B2 (en) | 2022-07-27 | 2024-04-23 | Pilot Gene Technology (hangzhou) Co., Ltd. | Drop preparation device and drop preparation method |
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|---|---|---|---|---|
| CN106981556A (en) * | 2017-03-24 | 2017-07-25 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | It is a kind of can fine adjustment spacing expansion film machine and its adjusting method |
| CN110579329B (en) * | 2019-06-27 | 2024-04-19 | 中国空气动力研究与发展中心低速空气动力研究所 | Sub/transonic jet noise research test device |
| CN112850207B (en) * | 2021-01-06 | 2023-04-18 | 内蒙古蒙维科技有限公司 | Method for controlling powder buffering and flow stabilizing warehouse weight warehouse pressure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103092222B (en) * | 2012-12-31 | 2016-01-27 | 孙晓君 | A kind of pressure precise adjustment device |
-
2012
- 2012-12-31 CN CN201210586305.6A patent/CN103092222B/en active Active
-
2013
- 2013-12-19 CA CA2837786A patent/CA2837786A1/en not_active Abandoned
- 2013-12-23 WO PCT/CN2013/090202 patent/WO2014101728A1/en active Application Filing
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| US3941148A (en) * | 1975-04-17 | 1976-03-02 | Sun Oil Company Of Pennsylvania | Control valve drive |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014101728A1 (en) * | 2012-12-31 | 2014-07-03 | Sun Xiaojun | Device for precisely adjusting pressure |
| WO2014106437A1 (en) * | 2013-01-04 | 2014-07-10 | 北京银谷科讯信息技术有限公司 | Pressure adjusting device |
| CN111381614A (en) * | 2020-03-26 | 2020-07-07 | 杭州汇健科技有限公司 | Pressure micro-control device for in-situ collection of molecules on surface of sample, and operation method and use method thereof |
| CN111381614B (en) * | 2020-03-26 | 2023-09-12 | 杭州汇健科技有限公司 | In-situ pressure acquisition micro-control device and control method thereof |
| CN112032380A (en) * | 2020-08-25 | 2020-12-04 | 中车青岛四方车辆研究所有限公司 | Pressure reducing device and closed-loop control method for pressure output regulation of pressure reducing device |
| CN112945461A (en) * | 2021-02-02 | 2021-06-11 | 同济大学 | Multifunctional pressure gauge automatic test system, method and device |
| CN112945461B (en) * | 2021-02-02 | 2022-05-20 | 同济大学 | Multifunctional pressure gauge automatic test system, method and device |
| WO2024021748A1 (en) * | 2022-07-27 | 2024-02-01 | 领航基因科技（杭州）有限公司 | Droplet preparation device and method |
| US11964271B2 (en) | 2022-07-27 | 2024-04-23 | Pilot Gene Technology (hangzhou) Co., Ltd. | Drop preparation device and drop preparation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103092222B (en) | 2016-01-27 |
| WO2014101728A1 (en) | 2014-07-03 |
| CA2837786A1 (en) | 2014-06-30 |
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Effective date of registration: 20160720 Address after: 065000 Langfang City, Hebei Province Economic and Technological Development Zone Guangyang Cheong Cheung Road No. 10 Patentee after: Watson Measurement & Control Technology (Hebei) Co., Ltd. Address before: 100191, Beijing, Haidian District, 238 North Fourth Ring Road, 100 Yan building, room 13, room 1301 Patentee before: Sun Xiaojun |