WO2006035488A1 - 定量搬送装置及びこれに用いられる往復動ポンプ - Google Patents
定量搬送装置及びこれに用いられる往復動ポンプ Download PDFInfo
- Publication number
- WO2006035488A1 WO2006035488A1 PCT/JP2004/014107 JP2004014107W WO2006035488A1 WO 2006035488 A1 WO2006035488 A1 WO 2006035488A1 JP 2004014107 W JP2004014107 W JP 2004014107W WO 2006035488 A1 WO2006035488 A1 WO 2006035488A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- flow rate
- motor
- pump
- strokes
- metering pump
- Prior art date
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Classifications
-
- 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
- F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
-
- 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
- F04B49/06—Control using electricity
Definitions
- Quantitative conveying device and reciprocating pump used therefor
- the present invention relates to a quantitative conveyance device provided with a metering pump such as a reciprocating pump on a conveyance channel for conveying fluid, and a reciprocating pump used therefor.
- a reciprocating pump is widely known as this type of metering pump.
- the reciprocating pump drives a pump unit such as a diaphragm, a plunger, or a bellows, and more specifically, to realize a preset flow rate (volume of fluid passing through an arbitrary cross section in a unit time). Based on the number of strokes (number of strokes per unit time) and the discharge amount of one stroke, the pump unit is driven to enable quantitative conveyance as a whole.
- the flow rate may fluctuate due to changes in the operating state.
- the factors include fluctuations in operating conditions due to downstream pressure fluctuations and temperature differences.
- the flow rate may also change due to voltage fluctuations in the metering pump.
- the metering device comprises a metering pump 1 as shown in FIG. 4, a flow meter 2 electrically connected to the metering pump 1, and a constant pressure valve 3, and a storage tank 4 serving as a fluid supply source. It is provided on the transfer flow path 6 provided between the pipe portion 5 communicating with the place where the fluid is used.
- the flow meter 2 measures the flow rate of the fluid conveyed by the metering pump 1, performs a comparison process between the actually measured flow rate and a preset flow rate (set flow rate), and based on the comparison result, The number of strokes of fixed-pump 1 is adjusted (corrected). That is, the applicant provided According to the metering device, since the metering pump 1 can be appropriately controlled by the flow meter 2, the set flow rate without adjusting the metering pump 1 can be maintained automatically and for a long time. It ’s like this.
- Patent Document 1 Japanese Patent Laid-Open No. 2004-52748
- a pulsating flow similar to a sine curve is generated except for a pulsating metering pump.
- the flow velocity (instantaneous flow rate) changes periodically from zero flow velocity to the maximum flow velocity during one stroke (Fig. 5 (ii)). Therefore, for the flow rate measurement in a system using a metering pump, the instantaneous flow rate is integrated every sampling time (for example, 5 ms), and the value (average flow rate) divided by unit time is used as the measured flow rate.
- a method of changing the flow rate that is, a method of changing the discharge flow rate of the metering pump
- the discharge flow rate can be changed by changing the rotation speed of the motor.
- the instantaneous flow rate decreases as the set flow rate decreases, that is, the discharge flow rate of the metering pump decreases.
- the accuracy of the flow meter 2 cannot sufficiently follow, and there is a possibility that the flow rate cannot be measured accurately. Therefore, when operating the above-mentioned quantitative transfer device at a low flow rate, the set flow rate is actually realized even if the device is intended to deliver a fixed amount according to the set flow rate! This can cause problems.
- the present invention has been made in view of these problems, and provides a quantitative conveyance device capable of quantitative conveyance at a set flow rate even at a low flow rate, and a reciprocating pump used therefor. This is the issue.
- a metering device includes a motor-driven metering pump provided on a transporting channel for transporting a fluid, and a flow rate checker provided on a transporting channel on the downstream side of the motor-driven metering pump.
- the motor-driven metering pump is equipped with a fixed-quantity conveying device, and the drive control of the motor is performed based on the number of strokes corresponding to the set flow rate.
- the motor drive control is intermittently performed based on the number of strokes used when the value is less than or equal to the predetermined value.
- the metering transport device includes a motor-driven metering pump provided on a transporting channel for transporting a fluid, and a flow rate check force provided on a transporting channel on the downstream side of the motor-driven metering pump.
- the motor-driven metering pump has a predetermined flow rate set to a predetermined value in a metering device in which the driving state of the motor-driven metering pump is controlled based on the actually measured flow rate obtained based on the information from the flow rate checker. If the value is higher than the predetermined value, the motor is controlled based on the number of strokes corresponding to the set flow rate. Thus, drive control of the motor is performed intermittently.
- the motor when the set flow rate is equal to or less than the predetermined value, the motor is repeatedly driven and stopped, that is, the pump unit is repeatedly driven and stopped. Drive control is performed intermittently.
- the set flow rate is realized by appropriately setting the drive period, the drive stop period, or the number of strokes.
- the quantitative pump is a reciprocating pump, and a stroke position for detecting a stroke position of a movable member such as a diaphragm, a plunger or a bellows in the pump unit. It is possible to employ a configuration that includes a detection means and that intermittently performs motor drive control in units of strokes. According to such a configuration, flow control is easy.
- the quantitative conveyance device according to the present invention may employ a configuration further comprising display means for displaying the measured flow rate. According to the profitable configuration, the current driving situation can be confirmed.
- This display means may be provided in the metering pump as a function of the metering pump, may be provided in the flow rate checker as a function of the flow rate checker, or may be configured independently of these. ! /
- alarm means that operates when an actual deviation amount obtained from the actually measured flow rate and the set flow rate according to the present invention exceeds a predetermined value. According to such a configuration, it is possible to accurately grasp the abnormal situation.
- This alarm means may be provided in the metering pump as a function of the metering pump, as in the display means, or may be provided in the flow rate checker as a function of the flow rate checker.
- the instantaneous flow rate (flow velocity) cannot be reduced by using the number of strokes used when the flow rate is higher than the predetermined value.
- the flow rate can be accurately measured without being affected by the inferior accuracy of the flow checker at low flow rates.
- by setting the power intermittently it is possible to realize a small set flow rate although the number of strokes is used when the value is higher than a predetermined value. Therefore, it becomes possible to carry a fixed quantity according to the set flow rate in the range of all set flow rates.
- the correction function works and fine adjustment of the flow rate is performed.
- the set flow rate can be maintained automatically and for a long time.
- FIG. 1 shows a sectional side view of a reciprocating pump according to the present embodiment.
- FIG. 2 is a block diagram relating to a control unit of the reciprocating pump according to the embodiment.
- FIG. 3 is a motor drive control of the reciprocating pump according to the embodiment, where (i) is a pulsation curve diagram at medium flow rate or high flow rate, and (mouth) is a pulsation curve diagram at low flow rate. .
- FIG. 4 A conceptual diagram of the quantitative transfer device.
- FIG. 5 (i) is a pulsation curve diagram for explaining the concept of average flow rate, and (mouth) is a conventional method. The pulsation curve figure by data drive control is shown.
- a reciprocating pump is used as the quantitative pump 1 in FIG. 4, and a flow meter is used instead of the discharge amount checker 2.
- a reciprocating pump 1 includes a pump unit 10, a drive unit 11, and a drive transmission unit 12.
- the pump unit 10 is configured so that fluid can be sucked from a suction hole 16 communicating with the pump chamber 14 and discharged from the discharge hole 17 to the outside by a diaphragm 15 that reciprocates in a pump chamber 14 in the pump head 13.
- Reference numeral 18 denotes a check valve incorporated in each of the suction hole 16 and the discharge hole 17.
- Reference numerals 19 and 20 denote a motor and a speed reducer that constitute the drive unit 11, and each is housed in the pump case 21, and the rotating shaft 22 of the speed reducer 20 is a space formed in the upper part of the pump case 21. Projecting into part 23.
- the motor 19 is a three-phase motor driven by inverter control. And an inverter 25 for controlling the entire pump including the inverter 25 are also provided in the pump case 21.
- FIG. 27 denotes a pump shaft having the diaphragm 15 connected to one end, and 26 is configured to be able to engage with the other end of the pump shaft 27 that reciprocates the pump shaft 27.
- the eccentric cam 26 and the pump shaft 27 constitute the drive transmission portion 12.
- the pump shaft 27 is pressed and biased toward the eccentric cam 26 by the elastic force of the coil panel 28 passed through the pump shaft 27.
- Reference numeral 29 denotes a position sensor that detects the home position of the eccentric cam 26 (that is, the home position of the drive transmission unit 12).
- the control unit 23 as shown in FIG. 2 includes an input unit 30, a calculation unit 31, and an output unit 32.
- the input unit 30 is a part for inputting the measurement data obtained from the flow meter 2, the set flow rate value input using the operation unit 33 provided in the reciprocating pump 1, and the detection signal of the position sensor 29.
- the calculation unit 31 obtains the average flow rate based on the measurement data obtained from the flow meter 2, performs a comparison process between the average flow rate and the set flow rate, determines the number of strokes in consideration of the correction, and determines the number of strokes.
- the output unit 32 is a part that outputs a frequency command based on the determined operation frequency to the inverter 25.
- the correction function works to finely adjust the flow rate.
- the set flow rate is automatically maintained for a long time.
- the drive control of the motor 19 is performed when operating at a low flow rate and when operating at other flow rates (medium flow rate, high flow rate). Is different.
- the motor 19 when operating at a medium flow rate and a high flow rate (for example, the average flow rate is higher than the maximum flow rate of 1Z2) as shown in Fig. 3, the motor 19 is based on the number of strokes corresponding to the set flow rate, as in the past. (Fig. 3 (ii)), and when operating at a low flow rate (for example, the average flow rate is 1Z2 or less of the maximum flow rate), the number of strokes of the motor 19 Drive control is performed intermittently in units of one stroke (Fig. 3 (mouth)).
- the motor 19 is stopped at the end of one stroke, a stop period is provided for the motor 19, and after starting to operate, the operation is started for one stroke.
- a stop period is provided for the motor 19, and after starting to operate, the operation is started for one stroke.
- the pitch between strokes should be set to 5 times the stroke cycle. Such a function is borne by the control unit 23.
- the detection signal of the position sensor 29 is used as a trigger to stop energization at the end of one stroke. That is, when the eccentric cam 26 reaches the home position set at the end position of one stroke (end position of the pump suction stroke), a detection signal is output from the position sensor 29, and the control unit 23 receiving the signal outputs the detection signal. The brake is applied to the pump and the drive of the pump unit 10 is stopped.
- the instantaneous flow rate (flow velocity) does not become small, so that it is not affected by the inferior accuracy of the flow meter 2 at a low flow rate.
- the flow rate can be measured accurately.
- the quantitative conveyance device in combination with its own correction function, it is possible to quantitatively convey according to the set flow rate in all ranges of low flow rate, medium flow rate, and high flow rate.
- a drive motor stop period for the motor 19 (drive stop period of the pump unit 10) is provided at the end of one stroke.
- it is not limited to the end point of one stroke, and may be provided, for example, at the end point of two strokes.
- the force when operating at a low flow rate, the force is set to set the pitch between strokes based on the maximum number of strokes.
- (1Z2) X maximum stroke number may be used as a reference.
- the number of reference strokes is not limited and is not fixed.
- the motor drive is stopped at the end of the stroke, that is, at the end of the pump suction stroke. May be stopped.
- the former is preferable in terms of simple control.
- the reciprocating pump 1 (the control unit 23) obtains an average flow rate based on information from the flow meter 2 and performs comparison processing.
- the flow meter 2 itself The average flow rate is obtained and this information is sent to the reciprocating pump 1 so that the reciprocating pump 1 performs comparison processing.
- the flow meter 2 itself obtains the average flow rate and performs comparison processing, and the metering pump 1
- the motor drive control may be performed.
- the flow rate checker according to the present invention includes any of these types of flow meters.
- the reciprocating pump 1 includes the drive unit 11.
- the drive unit 11 (or only the motor 19) may be separate from the pump body.
- the control unit 23 may be separated from the pump main body without having the interior.
- a force using a three-phase motor for inverter control (frequency control) as the motor 19 may be a motor by pulse control such as a servo motor. Can be applied.
- the constant pressure valve 3 is provided and the upstream side of the constant pressure valve 3 is conveyed.
- the flow meter 2 is made to function properly by suppressing the fluctuation of the fluid pressure in the flow path, the constant pressure valve is not essential in the present invention.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Reciprocating Pumps (AREA)
Abstract
Description
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2004/014107 WO2006035488A1 (ja) | 2004-09-27 | 2004-09-27 | 定量搬送装置及びこれに用いられる往復動ポンプ |
Applications Claiming Priority (1)
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PCT/JP2004/014107 WO2006035488A1 (ja) | 2004-09-27 | 2004-09-27 | 定量搬送装置及びこれに用いられる往復動ポンプ |
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WO2006035488A1 true WO2006035488A1 (ja) | 2006-04-06 |
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PCT/JP2004/014107 WO2006035488A1 (ja) | 2004-09-27 | 2004-09-27 | 定量搬送装置及びこれに用いられる往復動ポンプ |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6226625Y2 (ja) * | 1979-10-08 | 1987-07-08 | ||
JP2004052748A (ja) * | 2002-05-31 | 2004-02-19 | Tacmina Corp | 定量搬送装置 |
-
2004
- 2004-09-27 WO PCT/JP2004/014107 patent/WO2006035488A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6226625Y2 (ja) * | 1979-10-08 | 1987-07-08 | ||
JP2004052748A (ja) * | 2002-05-31 | 2004-02-19 | Tacmina Corp | 定量搬送装置 |
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