WO2004048780A1

WO2004048780A1 - Metered quantity transfer device

Info

Publication number: WO2004048780A1
Application number: PCT/JP2003/014970
Authority: WO
Inventors: Tadashi Kukitome
Original assignee: Tacmina Corporation
Priority date: 2002-11-28
Filing date: 2003-11-21
Publication date: 2004-06-10
Also published as: EP1574713B1; AU2003284657A1; US20050287009A1; EP1574713A1; EP1574713A4

Abstract

A metered quantity transfer device making it possible, by using a metering pump, to maintain a predetermined delivery flow for a long time without special adjustment. A metered quantity transfer device (10) having a metering pump (11) placed in a transfer flow channel (31) for transferring fluid is characterized by the provision of a delivery quantity checker (12) placed in the transfer flow channel (31) downstream of the metering pump (11), and a constant pressure valve (13) in the transfer flow channel (31) downstream of the delivery quantity checker (12), wherein the driving state of the metering pump (11) is controlled on the basis of a detection signal from the delivery quantity checker (12).

Description

Description Quantitative transfer device technology 1W field

The present invention relates to a fixed-quantity transfer device provided with a fixed-quantity pump on a transfer channel for transferring a fluid. Background art

In the field of chemicals and chemicals, which transport chemicals and chemicals to produce various chemical products, etc., it is highly necessary to transport strongly acidic or strongly alkaline fluids quantitatively. Conventionally, various metering pumps have been used. As such a metering pump, for example, a diaphragm type reciprocating pump (hereinafter, simply referred to as “reciprocating pump”) that drives (reciprocates) a diaphragm or the like to convey a fluid is known.

A reciprocating pump constructed using a diaphragm as described above converts a rotary motion obtained by a driving means such as a motor into a linear reciprocating motion via a cam, and drives the diaphragm by the linear reciprocating motion. Well configured.

The above-described reciprocating pump performs the fluid transfer process based on the reciprocating motion of the diaphragm.In this case, the fluid in the pump head is pressurized and pushed out by the forward movement of the diaphragm. When the diaphragm moves backward, the pressure inside the pump head is reduced, and the fluid is drawn in (returning process).

In addition, the reciprocating pump according to the related art can perform quantitative transport as a whole by repeating relatively fine forward and backward steps a predetermined number of times in a predetermined time. That is, the above-described reciprocating pump is provided on the fluid transfer channel, and a fixed-quantity transfer device is basically configured using only the reciprocating pump to realize the fixed-quantity transfer of the fluid. However, the quantitative transfer device according to the above-described conventional technology has the following problems.

In the above-described metering pump according to the related art, the discharge flow rate and the like are basically set by a drive signal (eg, the number of pulses) supplied from a power supply device or the like. In other words, a predetermined relationship is established between the drive signal (number of pulses, etc.) and the discharge flow rate under certain conditions, and the discharge flow rate (number of pulses, etc.) is determined in consideration of these conditions. Have been. However, when the metering pump is actually driven, the “constant conditions” initially considered may be disrupted on the upstream side or downstream side (especially on the downstream side). There is a problem that it is difficult to maintain the discharge flow rate for a long time.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and it is possible to maintain a predetermined discharge flow rate for a long time by using a metering pump without particular adjustment. It is an object of the present invention to provide a constant quantitative transfer device. Disclosure of the invention

The present invention has been made in order to solve the above-mentioned conventional technology, and is a fixed-quantity transfer device including a fixed-quantity pump on a transfer flow path for transferring a fluid, wherein A discharge pressure change force is provided, a constant pressure valve is provided on the transport flow path downstream of the discharge flow check force, and a driving state of the metering pump is controlled based on a detection signal of the discharge flow checker. It is characterized by being done.

According to such a configuration, the metering pump is driven based on a predetermined setting, the fluid discharge amount at the time of the drive is detected by the discharge amount checker, and the discharge amount checker is used by using the detection signal. Since the driving state of the metering pump is controlled, that is, not depending only on the setting state of the metering pump, the metering pump is appropriately controlled using the discharge amount checker. The specified discharge flow rate can be maintained for a long time. Furthermore, according to such a configuration, since the constant pressure valve is provided downstream of the metering pump and the discharge amount checker, conditions such as flow rate fluctuation are provided downstream (fluid use side) of the constant pressure valve. Even if a change (condition change equal to or less than the set value of the constant pressure valve) occurs, the fluctuation of the fluid pressure in the transport flow path on the upstream side of the constant pressure valve is suppressed. Therefore, the metering pump and the discharge amount checker function properly, and the predetermined discharge flow amount (discharge pressure) can be maintained with higher accuracy.

Further, the present invention is a fixed-quantity transfer device including a fixed-quantity pump on a transfer flow path for transferring a fluid, wherein a discharge amount checker is provided on a downstream side of the fixed-quantity pump, and a discharge amount checker is provided on a downstream side of the discharge amount check force. A constant pressure valve is provided, and a driving state of the metering pump is controlled based on a detection signal of the discharge amount checking force. That is, the present invention is characterized in that the quantitative transport device is integrally configured by using these components.

According to such a configuration, since each element is integrally formed without passing through the transport flow path, an accurate discharge amount can be measured by the discharge amount checker without being affected by, for example, piping pressure loss. It is. Therefore, the actual discharge amount of the metering pump can be controlled with higher accuracy.

Further, in the fixed-quantity transport device according to the present invention, the fixed-quantity pump is a reciprocating pump, and a stroke length of the movable portion is set to be constant. Based on the detection signal, a stroke of the movable portion is determined. A configuration in which the number of times is controlled is preferable.

According to this preferred configuration, since the stroke length of the movable portion is set to be constant (for example, 100%), the discharge condition in the metering pump is stabilized, and the discharge amount checker provided on the downstream side thereof is provided. Measurement accuracy can be improved. In other words, by increasing the measurement accuracy of the discharge amount checker, it is possible to adjust the discharge amount of the transported fluid transported by using the quantitative transport device with higher accuracy.

Further, in the fixed-quantity transport device according to the present invention, the fixed-quantity pump is a reciprocating pump, and a movable part thereof includes at least a diaphragm, a plunger, and a bellows. It is preferable to use a configuration using one of them.

Further, in the fixed quantity transfer device according to the present invention, the constant pressure valve includes a diaphragm provided to be in contact with a fluid to be transferred, and an urging means provided to urge the diaphragm toward the fluid. It is preferable to be comprised using.

According to this preferred configuration, since the constant pressure valve has a damper function, pulsation at the time of discharge of the metering pump can be reduced. Then, due to the pulsation reduction, controllability in controlling the discharge flow rate is also improved.

In addition, in the constant-rate transport device according to the present invention, it is preferable that a display unit that displays an actual discharge amount of the constant-rate pump based on a discharge amount signal of the constant-rate pump is provided.

Further, in the fixed quantity transport device according to the present invention, the deviation alarm means for issuing an alarm based on an actual deviation value obtained from an actual discharge amount and a target discharge amount of the constant amount pump and a predetermined deviation value set in advance. Is preferably provided. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic view of a fixed-quantity transport device according to an embodiment of the present invention. FIG. 2 is a schematic view of a fixed-quantity transport device according to another embodiment of the present invention.

FIG. 3 is a schematic view of an integrated quantitative transfer device according to another embodiment of the present invention.

FIG. 4 shows an enlarged cross-sectional view of the constant-pressure valve constituting the fixed-quantity transfer device shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic diagram of a fixed-quantity transport device according to an embodiment of the present invention. As shown in FIG. 1, the fixed-quantity transport device 10 according to the present embodiment includes a fixed-quantity pump 11, a discharge amount checker 12, and a constant-pressure valve 13.

More specifically, the fixed-quantity transfer device 10 is provided on a transfer flow passage 31 provided between a storage tank 21 serving as a fluid supply source and a pipe portion 22 communicating with a cylinder where the fluid is used. It is provided in. Then, a discharge amount checker 12 is provided on the transfer flow path 31 downstream of the metering pump 11, and a constant pressure valve 13 is provided on the transfer flow path 31 downstream of the discharge amount checker 12. ing.

The fixed-quantity pump 11 constituting the fixed-quantity transfer device 10 is configured to discharge a fixed amount by reciprocating a diaphragm or the like so as to have a predetermined set value. That is, the metering pump 11 according to the present embodiment determines the driving state (the number of strokes, the stroke length, etc., in accordance with the discharge flow rate) while calculating to achieve a preset discharge flow rate. Therefore, in a normal operation state, it is possible to discharge and transport a fixed amount of fluid using only the metering pump 11 described above.

However, even with the metering pump configured as described above, the discharge flow rate may fluctuate due to a change in the operation state or the like. Factors for this include pressure fluctuations in the piping section 22 (or a fluid use location downstream of the piping section 22), and fluctuations in operating conditions due to temperature differences and the like. Also, the discharge flow rate may fluctuate due to voltage fluctuations in the metering pump.

Therefore, in the present embodiment, in order to prevent fluctuations in the discharge amount of the fixed-quantity pump 11 due to the influence of pressure fluctuations and the like as described above, a discharge amount checker 12 and a constant-pressure valve 1 are provided downstream of the fixed-quantity pump 11. 3, the fixed-quantity transfer device 10 is configured.

As shown in FIG. 1, in the fixed-quantity transfer device 10, a fixed-quantity pump 11 and a discharge amount checker 12 provided on the downstream side thereof are electrically connected via a control wiring 41. I have.

The discharge amount checker 12 measures the actual discharge amount of the fluid conveyed by the metering pump 11, compares the target discharge amount (set value) with the actually measured discharge amount, and performs arithmetic processing. It is configured to adjust the number of strokes and the like of the metering pump 11 based on the results. More specifically, in the present embodiment, the stroke length is determined to be constant (for example, 100%) as the operating condition of the metering pump 11, and the fluid conveyed under this operating condition is determined. A discharge amount checker 12 is provided to detect (monitor) the discharge amount. At this time, the set value for the metering pump 11 is also recognized by the discharge amount checker 12, and the discharge amount checker 12 compares the measured value (detection signal) of the conveyed fluid with the set value. It is configured to perform arithmetic processing and automatically correct the number of strokes based on the arithmetic result.

Further, in the fixed amount transport device 10 according to the present embodiment, a constant pressure valve 13 is provided further downstream of the discharge amount checker 12. In other words, since the constant pressure valve 13 is provided downstream of the discharge amount checker 12 that detects the actual discharge amount of the metering pump 11, the influence of pressure fluctuations and the like in the piping section 22 is reduced. Can be suppressed.

The constant pressure valve 13 used in the present embodiment includes, for example, a diaphragm provided to come into contact with the carrier fluid, and biasing means (compression coil spring, or the like) provided to apply a predetermined pressure to the diaphragm. By adjusting the biasing means (for example, by adjusting the length (compression length) of the compression coil spring, etc.), the regulation of the constant pressure valve is achieved. Pressure is determined.

According to the present embodiment, as described above, the constant pressure valve is configured using the diaphragm and the urging means, and the constant pressure valve has a damper function based on such a configuration. The pulsation at the time of the discharge of 11 can be reduced, and the control of the discharge flow rate is also improved due to the reduction of the pulsation.

As described above, in the present embodiment, the discharge amount checker 12 is provided downstream of the metering pump 11, and the constant pressure valve 13 is provided downstream of the discharge amount checker 12. The drive state of the metering pump 11 is controlled based on the detection signal of the checker 12. In other words, in the fixed-quantity transport device 10 according to the present embodiment, in order to realize a preset discharge amount by the constant-quantity pump 11, the discharge amount checker 12 is used. The number of strokes of the metering pump 11 is controlled. In addition, by providing a constant pressure valve 13 downstream of the discharge amount checker 12, the influence of fluctuation conditions on the piping section 22 and the like and on the downstream side thereof is suppressed, and the discharge condition of the metering pump 11 is stabilized. ing.

Therefore, according to the fixed-quantity transfer device 10 according to the present embodiment, the fixed-quantity pump 11 is appropriately controlled by using the discharge amount checker 12 instead of relying only on the setting state of the fixed-quantity pump 11, It is possible to maintain a predetermined discharge flow rate for a long time. In addition, since the constant pressure valve 13 is provided downstream of the discharge amount checker 12, pressure fluctuations on the upstream side of the constant pressure valve 13 are suppressed, and the metering pump 11 and the discharge amount checker 12 are appropriately controlled. By functioning, the specified discharge flow rate (discharge pressure) can be maintained with higher accuracy. The present invention is not limited to the above-described embodiment, and various changes other than those described above can be made without departing from the gist of the present invention.

For example, in the above-described embodiment, the configuration in which the discharge amount checker 12 performs arithmetic processing and the like to substantially control the fixed amount pump 11 has been described. However, the present invention is not limited to this configuration, A predetermined control device or the like may be provided accordingly to control the metering pump 11. In other words, a control device may be provided on the control wiring 41 between the discharge amount checker and the metering pump 11, and the discharge amount checker may have a simple configuration that simply measures the discharge amount. . According to such a configuration, the fixed-quantity transport device according to the present invention can be easily obtained by using the conventionally used ejection amount checker. Also, in the above embodiment, the configuration of the metering pump 11 was not particularly described. However, if the movable portion can reciprocate to transport the fluid (if it is a reciprocating pump), the present invention is not limited to this configuration. The metering pump 11 according to the invention is not limited to any configuration. Therefore, for example, any of a reciprocating pump having a diaphragm, a plunger, a bellows, or the like as a movable portion can constitute the fixed-quantity transfer device according to the present invention.

Further, in the above embodiment, the case where the fixed amount transport device 10 is configured by using the fixed amount pump 11, the discharge amount checker 12, and the constant pressure valve 13 has been described. The present invention is not limited to this configuration, and as long as it has at least these elements, another element may be further added to configure the fixed-quantity transfer device.

Therefore, for example, as shown in FIG. 2, an external output device 14 may be added to configure the fixed-quantity transport device 10 ′. Here, the external output device 14 includes, for example, a display unit (not shown) for displaying the actual discharge amount of the carrier fluid discharged from the fixed amount pump 11, and an actual discharge amount and a target discharge amount. It is configured to have a deviation alarm unit (not shown) that issues an alarm when the "deviation" from the above exceeds a predetermined value.

In the configuration as shown in FIG. 2, the metering pump 11 is driven based on the control signal from the discharge force 12 obtained through the control wiring 41, and the metering pump 11 performs measurement calculation. The actual discharge amount (discharge amount signal) is sent to the external output device 14 via the output signal wiring 42. The display section (corresponding to the “display means” of the present invention) constituting the external output device 14 displays the actual discharge amount of the metering pump 11 based on the discharge amount signal. That is, the user can easily grasp the actual discharge amount of the metering pump 11 by seeing the display of the external output device 14.

Further, in the present embodiment, an output signal (analog signal) of 0 to 20 mA or 412 mA is sent via the output signal wiring 42, and based on the output signal, the display unit Displays the actual discharge amount. However, the present embodiment is not limited to this configuration, and the actual discharge amount is displayed based on a digital signal obtained from the metering pump 11 as necessary.

Further, in the embodiment shown in FIG. 2, the “displacement” between the actual discharge amount and the target discharge amount is set in advance by taking advantage of the characteristic of actually measuring the discharge amount of the metering pump 11 as described above. It is configured to issue an alarm if the value exceeds the specified value. For example, a target discharge amount and a predetermined deviation value (for example, 1 to 20%) are set (stored) in the metering pump 11 and the actual discharge amount and the target discharge amount are set in the metering pump 11 based on the actual discharge amount and the target discharge amount. The deviation value is calculated, and when the actual deviation value exceeds a predetermined deviation value, a deviation alarm signal is sent from the metering pump 11 to the external output device 14 via the output signal wiring 43. And in this embodiment In this case, an alarm is issued by a deviation alarm section (corresponding to “deviation alarm means” of the present invention) constituting the external output device 14 based on the deviation alarm signal. As the deviation warning unit, for example, one configured using a light emitting means such as a lamp, one configured using an acoustic means such as a speaker, or both of the light emitting means and the acoustic means is used. And the like.

Although FIG. 2 illustrates the case where the discharge amount signal and the deviation warning signal are transmitted to the external output device 14 via different output signal wirings, the present invention is limited to this configuration. Instead, a configuration in which only the discharge amount signal is transmitted to the external output device 14 may be employed. In such a case, the target output amount and the predetermined deviation value are stored in the external output device 14, and the actual deviation value is calculated based on the discharge amount signal, and the predetermined deviation value is compared with the actual deviation value. Calculation is performed, and a warning is generated in the deviation warning unit based on the calculation results.

Further, in FIG. 2, the case where the display unit and the deviation alarm unit are provided in the external output device 14 has been described. However, the present invention is not limited to this configuration. It may be separate (ie, as a display, deviation alarm).

Furthermore, in the fixed-quantity transfer device according to each of the above embodiments, a case has been described in which the fixed-quantity pump 11, the discharge amount checker 12, and the constant-pressure valve 13 are separately provided on the transfer passage 31. However, the present invention is not limited to this configuration. If necessary, two or more parties may be integrally formed.

Therefore, for example, as shown in FIG. 3, all the elements may be integrally configured to constitute a fixed-quantity transport device 10 ". According to the fixed-quantity transport device 10" shown in FIG. The discharge amount checker 12 is connected to the discharge port of the carrier fluid of the metering pump 11, the constant pressure valve 13 is connected downstream of the discharge amount checker 12, and the relief valve 1 is connected to the constant pressure valve 13. 5 are provided. That is, in the present embodiment, the integrated fixed-quantity transfer device 10 ″ is provided on the transfer passage 31. According to the fixed-quantity transfer apparatus 10 "as shown in FIG. 3, since each element is integrally formed without passing through the transfer flow path, for example, the discharge amount checker is not affected by a pipe pressure loss or the like. The accurate discharge amount can be measured with the force 12. Therefore, the actual discharge amount in the metering pump 11 can be controlled with higher accuracy.

FIG. 4 is an enlarged cross-sectional view of the constant pressure valve 13 included in the fixed quantity transfer device 10 ″ shown in FIG.

According to FIG. 4, the constant pressure valve 13 according to the present embodiment includes a diaphragm 13 1 in contact with the flow paths 32 and 33 communicating with the transfer flow path 31 and a diaphragm 13 1 attached to the diaphragm 13 1. Compression coil spring 13 to which force is applied, spring guide 13 provided between diaphragm 13 and compression coil spring 13 and compression coil spring 13 to spring guide 1 It is configured by using spring retainers 1 3 4 etc. which press down on the 3 3 side.

According to the constant pressure valve 13 according to the present embodiment, the predetermined pressure in the constant pressure valve 13 is set by adjusting the amount of contraction of the compression coil spring 13 2 by the spring retainer 134. Then, when the carrier fluid flows in from the flow path 32 at a pressure equal to or higher than the predetermined pressure, the diaphragm 13 1 bends in the direction of the arrow X, and appropriate fluid conveyance is performed.

Although the detailed description of the structure of the relief valve 15 is omitted here, for example, the relief valve 15 may have the same configuration as the constant pressure valve 13. In such a case, the setting pressure of the relief valve 15 is set to be larger than that of the constant pressure valve 13 by the adjustment port, so that the pressure is higher than the set pressure of the constant pressure valve 13 and the relief valve 15 is set. If the fluid has a pressure lower than the pressure, it can be transported appropriately. If the fluid has a pressure equal to or higher than the set pressure of the relief valve 15, the relief pipe provided in the relief valve 15 (illustrated) (Omitted), it is possible to discharge the liquid to the outside of the transport channel 31 appropriately. If the relief valve 15 having such a configuration is provided, even if a fluid having a pressure equal to or higher than the set value is conveyed, it is possible to appropriately protect the piping.

As described above, the present invention includes a metering pump on a transport channel for transporting a fluid. A fixed amount valve is provided on the transfer passage downstream of the fixed amount pump on the transfer passage downstream of the fixed amount pump. And a driving state of the metering pump is controlled based on a detection signal of the discharge amount checker.

Therefore, according to the present invention, the metering pump can be appropriately controlled by the discharge amount checker while suppressing the influence on the downstream side by the constant pressure valve. It is possible to obtain a fixed-quantity transfer device capable of maintaining a predetermined discharge flow rate for a long time.

Claims

Scope of Claim 1. A fixed-quantity transfer device including a fixed-quantity pump on a transfer flow path for transferring a fluid, wherein a discharge-amount checker is provided on the transfer flow path downstream of the fixed-quantity pump, and the discharge amount is specified. A constant pressure valve is provided on the transport flow path downstream of the check force,

A fixed-quantity transport device, wherein a driving state of the fixed-quantity pump is controlled based on a detection signal of the discharge amount checker.

2. A fixed-quantity transfer device provided with a fixed-quantity pump on a transfer flow path for transferring a fluid, wherein a discharge amount check force is provided downstream of the fixed-rate pump, and a constant pressure valve is provided downstream of the discharge amount check force. Is provided,

A fixed-quantity transport device, wherein a driving state of the fixed-quantity pump is controlled based on a detection signal of the discharge amount checking force.

3. The method according to claim 1, wherein the metering pump is a reciprocating pump, a stroke length of the movable portion is set to be constant, and the number of strokes of the movable portion is controlled based on the detection signal. The described quantitative transfer device.

4. The method according to any one of claims 1 to 3, wherein the metering pump is a reciprocating pump, and a movable part thereof is configured using at least one of a diaphragm, a plunger, and a bellows. Quantitative transfer device.

5. The constant pressure valve is configured by using a diaphragm provided to be in contact with the fluid to be conveyed, and an urging means provided to urge the diaphragm toward the fluid. 5. The fixed-quantity transport device according to any one of items 1 to 4.

6. The fixed-quantity transfer device according to any one of claims 1 to 5, further comprising display means for displaying an actual discharge amount in the constant-rate pump based on a discharge amount signal in the constant-rate pump.

7. A deviation alarm means for issuing an alarm based on an actual deviation value obtained from an actual discharge amount and a target discharge amount of the metering pump and a predetermined deviation value set in advance is provided. The quantitative transfer device according to any one of claims 1 to 6, wherein: