JP4531328B2 - Fixed quantity transfer device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a quantitative conveyance device having a quantitative pump on a conveyance channel for conveying a fluid.
[0002]
[Prior art]
In the fields of chemicals and chemicals that transport chemicals and chemicals to produce various chemical products, etc., it is highly necessary to quantitatively transport strongly acidic or alkaline fluids, and realize such quantitative transport For this reason, various metering pumps are conventionally used.
[0003]
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.
The reciprocating pump configured using the diaphragm in this way is configured to convert the rotary motion obtained by the driving means such as a motor into a linear reciprocating motion via a cam and drive the diaphragm by this linear reciprocating motion. ing.
[0004]
The reciprocating pump performs a fluid conveyance process based on the reciprocating motion of the diaphragm. At this time, the fluid in the pump head is pressurized and pushed out by the forward movement of the diaphragm. Moving process), when the diaphragm moves backward, the pressure in the pump head is reduced and the fluid is drawn (returning process).
[0005]
The reciprocating pump according to the prior art repeats a relatively fine forward movement process and a backward movement process a predetermined number of times in a predetermined time, thereby enabling quantitative conveyance as a whole. In other words, the above-described reciprocating pump is provided on the fluid conveyance channel, and basically, the quantitative conveyance device is configured using only this reciprocating pump to realize the quantitative conveyance of the fluid.
[0006]
[Problems to be solved by the invention]
However, the quantitative conveyance device according to the conventional technique has the following problems.
[0007]
The metering pump according to the above-described prior art basically has its discharge flow rate set by a drive signal (number of pulses, etc.) supplied from a power supply device or the like. In other words, since a predetermined relationship is established under certain conditions between the drive signal (number of pulses, etc.) and the discharge flow rate, the discharge flow rate (number of pulses, etc.) is determined in consideration of this condition. Yes.
[0008]
However, when the metering pump is actually driven, the “certain condition” originally considered may be lost on the upstream side or downstream side (especially on the downstream side), and therefore, it is determined in advance. There was a problem that it was difficult to maintain the discharged flow rate for a long time.
[0009]
Therefore, the present invention has been made to solve the above-described problems of the prior art, and can use a metering pump to maintain a predetermined discharge flow rate for a long time without any special adjustment. It is an object to provide a quantitative conveyance device.
[0010]
[Means for Solving the Problems]
The present invention has been made to solve the above-described prior art. A discharge amount checker is provided at a discharge port of a carrier fluid in the metering pump, and a constant pressure valve is provided downstream of the discharge amount checker. A relief valve is provided so as to face the pressure valve. The constant pressure valve and the relief valve include a diaphragm provided in contact with the carrier fluid, a compression coil spring provided to apply a predetermined pressure to the diaphragm, and the compression valve. A spring presser capable of adjusting the pressure of the coil spring, and the constant pressure valve and the relief valve are of the same shape, and the set pressure of the relief valve is set larger than that of the constant pressure valve, The driving state of the metering pump is controlled based on the detection signal of the discharge amount checker.
[0011]
According to such a configuration, the metering pump is driven based on a predetermined setting, the fluid discharge amount at the time of driving is detected by the discharge amount checker, and the metering pump is detected using the detection signal. Since the driving state of the pump is controlled, that is, it does not depend only on the setting state of the metering pump, but the metering pump is appropriately controlled using the discharge amount checker. The flow rate can be maintained for a long time.
Furthermore, according to such a configuration, since the constant pressure valve is provided on the downstream side of the metering pump and the discharge amount checker, conditions such as flow rate fluctuations on the downstream side (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, fluctuations in the fluid pressure in the transfer passage on the upstream side of the constant pressure valve are suppressed. Therefore, the metering pump and the discharge amount checker function appropriately, and a predetermined discharge flow rate (discharge pressure) can be maintained with higher accuracy.
[0012]
The present invention is also a metering device having a metering pump on a transport channel for transporting a fluid, wherein a discharge amount checker is provided on the downstream side of the metering pump, and a constant pressure valve is provided on the downstream side of the discharge amount checker. Is provided, and the driving state of the metering pump is controlled based on the detection signal of the discharge amount checker. That is, the present invention is characterized in that the quantitative conveyance device is integrally configured using these components.
[0013]
According to such a configuration, since each element is integrally configured without going through the conveyance flow path, for example, an accurate discharge amount can be measured with a discharge amount checker without the influence of piping pressure loss or the like. is there. Therefore, the actual discharge amount in the metering pump can be controlled with higher accuracy.
[0014]
Moreover, in the fixed quantity transport device according to the present invention, the fixed quantity pump is a reciprocating pump, the stroke length of the movable part is set to be constant, and the number of strokes of the movable part is determined based on the detection signal. A configuration in which is controlled is preferable.
[0015]
According to this preferred configuration, since the stroke length of the movable part is set to be constant (for example, 100%), the discharge condition in the metering pump is stabilized, and the discharge amount checker provided downstream thereof is measured. Accuracy can be increased. That is, by increasing the measurement accuracy of the discharge amount checker, it is possible to adjust the discharge amount of the transport fluid transported using the quantitative transport device with higher accuracy.
[0016]
Moreover, in the fixed_quantity | concentration conveying apparatus concerning this invention, the said quantitative pump is a reciprocating pump, Comprising: The structure by which the movable part is comprised using at least one of a diaphragm, a plunger, and a bellows is preferable.
[0017]
In the constant-quantity conveyance device according to the present invention, the constant pressure valve includes a diaphragm provided to contact the fluid to be conveyed, and an urging means provided to urge the diaphragm to the fluid side. It is preferable to be configured by using.
[0018]
According to this preferable configuration, since the constant pressure valve has a damper function, pulsation during discharge of the metering pump can be reduced. Due to this pulsation reduction, controllability when controlling the discharge flow rate is also improved.
[0019]
Moreover, in the fixed_quantity | conveyance apparatus concerning this invention, the structure provided with the display means which displays the actual discharge amount in the said metering pump based on the discharge amount signal in the said metering pump is preferable.
[0020]
Further, in the quantitative conveyance device according to the present invention, there is provided a deviation alarm means for issuing an alarm based on an actual deviation value obtained from the actual discharge amount and the target discharge amount in the metering pump and a predetermined deviation value set in advance. The configuration is preferable.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
FIG. 1 is a schematic view of a quantitative conveyance device according to an embodiment of the present invention. As shown in FIG. 1, the quantitative conveyance device 10 according to the present embodiment includes a quantitative pump 11, a discharge amount checker 12, and a constant pressure valve 13.
[0023]
More specifically, the quantitative conveyance device 10 is provided on a conveyance flow path 31 provided between a storage tank 21 that is a fluid supply source and a pipe portion 22 that communicates with a place where the fluid is used. A discharge amount checker 12 is provided on the conveyance channel 31 on the downstream side of the metering pump 11, and a constant pressure valve 13 is provided on the conveyance channel 31 on the downstream side of the discharge amount checker 12.
[0024]
The metering pump 11 constituting the metering / conveying device 10 is configured to discharge a certain 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 according to the discharge flow rate, the stroke length, etc.) while calculating in order to realize a preset discharge flow rate. Therefore, in a normal operation state, it is possible to discharge and convey a certain amount of fluid using only the metering pump 11.
[0025]
However, even in the metering pump configured as described above, the discharge flow rate may fluctuate due to a change in the operation state or the like. The factors include fluctuations in operating conditions due to pressure fluctuations in the piping part 22 (or fluid use location downstream of the piping part 22), temperature differences, and the like. Also, the discharge flow rate may vary due to voltage fluctuations in the metering pump.
[0026]
Therefore, in the present embodiment, in order to prevent the discharge amount fluctuation of the metering pump 11 due to the influence of the pressure fluctuation as described above, the discharge amount checker 12 and the constant pressure valve 13 are provided on the downstream side of the metering pump 11, A fixed amount conveying apparatus 10 is configured.
[0027]
As shown in FIG. 1, in this fixed amount conveying apparatus 10, a fixed amount pump 11 and a discharge amount checker 12 provided on the downstream side thereof are electrically connected via a control wiring 41.
[0028]
The discharge amount checker 12 performs measurement processing of the actual discharge amount of the fluid conveyed by the metering pump 11, comparison / calculation processing between the target discharge amount (set value) and the actual discharge amount, and the like based on the calculation processing result. The number of strokes of the metering pump 11 is adjusted.
More specifically, in the present embodiment, the operation length of the metering pump 11 is set to a constant stroke length (for example, 100%), and the discharge amount of the fluid conveyed under this operation condition is detected. In order to (monitor), a discharge amount checker 12 is provided. At this time, the set value for the metering pump 11 is also recognized in the discharge amount checker 12, and the discharge amount checker 12 compares the measured value (detection signal) of the carrier fluid with the set value and performs arithmetic processing. It is configured to automatically correct the number of strokes based on the calculation result.
[0029]
Further, in the fixed amount conveying device 10 according to the present embodiment, a constant pressure valve 13 is provided further downstream of the discharge amount checker 12. That is, since the constant pressure valve 13 is provided on the downstream side 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 portion 22 and the like can be suppressed.
The constant pressure valve 13 used in the present embodiment includes, for example, a diaphragm provided in contact with the carrier fluid, and an urging means (compression coil spring, plate) provided to apply a predetermined pressure to the diaphragm. By adjusting the biasing means (for example, by adjusting the length (contraction length) of the compression coil spring, etc.), the regulation pressure in the constant pressure valve is reduced. Determined.
According to the present embodiment, as described above, the constant pressure valve is configured by using the diaphragm and the urging means and the constant pressure valve has a damper function based on such a configuration. It is possible to reduce the pulsation at the time of discharge, and the controllability at the time of controlling the discharge flow rate is improved due to the reduction of the pulsation.
[0030]
As described above, in the present embodiment, the discharge amount checker 12 is provided on the downstream side of the metering pump 11, and the constant pressure valve 13 is provided on the downstream side of the discharge amount checker 12. Based on the signal, the driving state of the metering pump 11 is controlled. That is, in the quantitative conveyance device 10 according to the present embodiment, the number of strokes of the metering pump 11 is controlled using the discharge amount checker 12 in order to realize a preset discharge amount by the metering pump 11. Further, by providing the constant pressure valve 13 on the downstream side of the discharge amount checker 12, the discharge conditions of the metering pump 11 are stabilized by suppressing the influence of the piping portion 22 and the like and the fluctuation conditions on the downstream side.
[0031]
Therefore, according to the fixed amount conveying apparatus 10 according to the present embodiment, not depending only on the setting state of the constant amount pump 11, the fixed amount pump 11 is appropriately controlled using the discharge amount checker 12, and the predetermined discharge is determined. The flow rate can be maintained for a long time. Further, since the constant pressure valve 13 is provided on the downstream side of the discharge amount checker 12, the pressure fluctuation on the upstream side of the constant pressure valve 13 is suppressed, the metering pump 11 and the discharge amount checker 12 are appropriately functioned, and a predetermined discharge The flow rate (discharge pressure) can be maintained with higher accuracy.
[0032]
The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.
[0033]
For example, in the above-described embodiment, the configuration has been described in which the discharge amount checker 12 substantially controls the metering pump 11 by performing arithmetic processing or the like. However, the present invention is not limited to this configuration, and as necessary. A predetermined control device or the like may be provided to control the metering pump 11. That is, a control device may be provided on the control wiring 41 between the discharge amount checker and the metering pump 11, and a discharge amount checker having a simple configuration that only measures the discharge amount may be used. According to such a configuration, it is possible to easily obtain the quantitative conveyance device according to the present invention using the conventionally used discharge amount checker.
[0034]
Moreover, in the said embodiment, although the structure of the metering pump 11 was not demonstrated in particular, if the fluid can be conveyed by the reciprocating movement of the movable part (if it is a reciprocating pump), the present invention will be described. Such a metering pump 11 is not limited to any configuration. Therefore, for example, any reciprocating pump configured with a diaphragm, a plunger, a bellows, or the like as a movable portion can constitute the quantitative conveyance device according to the present invention.
[0035]
Moreover, in the said embodiment, although the case where the fixed quantity conveyance apparatus 10 was comprised using the fixed quantity pump 11, the discharge amount checker 12, and the constant pressure valve 13, this invention is not limited to this structure, As long as it has these elements at the minimum, other elements may be further added to constitute the quantitative conveyance device.
Therefore, for example, as shown in FIG. 2, an external output device 14 may be added to constitute a quantitative conveyance device 10 ′. Here, the external output device 14 is, for example, a display unit (not shown) for displaying the actual discharge amount of the carrier fluid discharged by the metering pump 11, and the “deviation between the actual discharge amount and the target discharge amount. ”Is configured to have a deviation alarm unit (not shown) that issues an alarm when the value exceeds a predetermined value.
[0036]
In the configuration shown in FIG. 2, the metering pump 11 is driven based on a control signal from the discharge force checker 12 obtained via the control wiring 41, and the actual discharge amount measured and calculated by the metering pump 11. (Discharge amount signal) is sent to the external output device 14 via the output signal wiring 42. In the display unit (corresponding to “display means” of the present invention) constituting the external output device 14, the actual discharge amount in the metering pump 11 is displayed based on the discharge amount signal. That is, the user can easily grasp the actual discharge amount of the metering pump 11 by viewing the display unit of the external output device 14.
In this embodiment, an output signal (analog signal) of 0-20 mA or 4-20 mA is sent via the output signal wiring 42, and the actual discharge amount is displayed on the display unit based on this output signal. The 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.
[0037]
Further, in the embodiment shown in FIG. 2, by utilizing the characteristic of actually measuring the discharge amount of the metering pump 11 as described above, the “deviation” between the actual discharge amount and the target discharge amount is a preset value. If exceeded, it is configured to issue an alarm. 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 deviation value is calculated based on the actual discharge amount and the target discharge amount in the metering pump 11. When the actual deviation value exceeds the 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. In this embodiment, a warning is issued by a deviation warning unit (corresponding to “deviation warning means” of the present invention) that constitutes the external output device 14 based on this deviation warning signal. The deviation alarm unit is configured using, for example, a light emitting unit such as a lamp, a unit configured using an acoustic unit such as a speaker, or configured using both the light emitting unit and the acoustic unit. And the like.
[0038]
In FIG. 2, the case where the discharge amount signal and the deviation alarm signal are transmitted to the external output device 14 via different output signal wirings has been described. However, the present invention is not limited to this configuration. Alternatively, only the discharge amount signal may be transmitted to the external output device 14. In such a case, the target discharge amount, the predetermined deviation value, and the like are stored in the external output device 14, and the calculation of the actual deviation value and the comparison operation between the predetermined deviation value and the actual deviation value are performed based on the discharge amount signal. Etc., and an alarm is generated in the deviation alarm unit based on these calculation results.
[0039]
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, and is separately provided as necessary. It may be a body (that is, as a display device or a deviation alarm device).
[0040]
Furthermore, in the quantitative conveyance device according to each of the embodiments described above, the case where the quantitative pump 11, the discharge amount checker 12, and the constant pressure valve 13 are provided separately on the conveyance flow path 31 has been described. The configuration is not limited to this, and two or more elements may be integrally configured as necessary.
[0041]
Therefore, for example, as shown in FIG. 3, all the elements may be configured integrally to form a quantitative conveyance device 10 ″. According to the quantitative conveyance device 10 ″ shown in FIG. 3, the quantitative pump 11, a discharge amount checker 12 is connected to the discharge port of the transport fluid, a constant pressure valve 13 is connected to the downstream side of the discharge amount checker 12, and a relief valve 15 is provided to face the constant pressure valve 13. That is, in the present embodiment, an integrally configured quantitative transfer device 10 ″ is provided on the transfer flow path 31.
[0042]
According to the quantitative conveyance device 10 ″ as shown in FIG. 3, since the elements are integrally configured without passing through the conveyance flow path, for example, the discharge amount checker 12 is not affected by the piping pressure loss or the like. Therefore, it is possible to control the actual discharge amount in the metering pump 11 with higher accuracy.
[0043]
FIG. 4 is an enlarged cross-sectional view of the constant pressure valve 13 that constitutes the constant-quantity conveying apparatus 10 ″ shown in FIG.
According to FIG. 4, the constant pressure valve 13 according to the present embodiment includes a diaphragm 131 in contact with the flow paths 32 and 33 communicating with the transport flow path 31, and a compression coil that applies an urging force to the diaphragm 131. The spring 132, a spring guide 133 provided between the diaphragm 131 and the compression coil spring 132, and a spring retainer 134 that presses the compression coil spring 132 toward the spring guide 133 are configured.
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 132 by the spring retainer 134. Then, when the carrier fluid flows from the flow path 32 at a pressure equal to or higher than a predetermined pressure, the diaphragm 131 is bent in the arrow X direction, and appropriate fluid conveyance is performed.
[0044]
In addition, although the detailed description about the structure of the relief valve 15 was abbreviate | omitted here, the thing of the structure similar to the constant pressure valve 13 can be used as the relief valve 15, for example. In such a case, the set pressure of the relief valve 15 is set larger than that of the constant pressure valve 13 by the adjusting bolt, so that the pressure is equal to or higher than the set pressure of the constant pressure valve 13 and less than the set pressure of the relief valve 15. If the fluid has a pressure equal to or higher than the set pressure of the relief valve 15, it can be appropriately conveyed via a relief pipe (not shown) provided in the relief valve 15. It becomes possible to discharge to the outside of the transport channel 31. If the relief valve 15 having such a configuration is provided, pipes can be appropriately protected even when a fluid having a pressure equal to or higher than a set value is conveyed.
[0045]
【The invention's effect】
As described above, the present invention is a metering device having a metering pump on a transport channel for transporting a fluid, wherein a discharge amount checker is provided on the transport channel on the downstream side of the metering pump, A constant pressure valve is provided on the transport flow path downstream of the discharge amount checker, and is configured to control the driving state of the metering pump based on the detection signal of the discharge amount checker.
Therefore, according to the present invention, it is possible to appropriately control the metering pump with the discharge amount checker while suppressing the downstream influence with the constant pressure valve. A quantitative conveyance device capable of maintaining the discharge flow rate for a long time can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic view of a quantitative conveyance device according to an embodiment of the present invention.
FIG. 2 is a schematic view of a quantitative conveyance device according to another embodiment of the present invention.
FIG. 3 is a schematic view of an integrally configured quantitative conveyance device according to another embodiment of the present invention.
4 is an enlarged cross-sectional view of a constant pressure valve that constitutes the quantitative conveyance device shown in FIG. 3;
[Explanation of symbols]
10, 10 ', 10 "... metering device 11 ... metering pump (reciprocating pump)
DESCRIPTION OF SYMBOLS 12 ... Discharge amount checker 13 ... Constant pressure valve 14 ... External output device 15 ... Relief valve 21 ... Storage tank 22 ... Piping part 31 ... Transfer flow path 32, 33 ... Flow path 41 ... Control wiring 42, 43 ... Output signal wiring 131 ... Diaphragm 132 ... Compression coil spring 133 ... Spring guide 134 ... Spring retainer

Claims (6)

A quantitative conveyance device provided with a quantitative pump on a conveyance channel for conveying fluid,
A discharge amount checker is provided at the discharge port of the carrier fluid in the metering pump, a constant pressure valve is provided downstream of the discharge amount checker, and a relief valve is provided so as to face the constant pressure valve,
The constant pressure valve and the relief valve include a diaphragm provided in contact with the carrier fluid, a compression coil spring provided to apply a predetermined pressure to the diaphragm, and a spring presser capable of setting the pressure of the compression coil spring. In addition, the constant pressure valve and the relief valve are of the same shape, and the set pressure of the relief valve is set larger than that of the constant pressure valve,
The metering device according to claim 1, wherein a driving state of the metering pump is controlled based on a detection signal of the discharge amount checker.   The quantitative conveyance according to claim 1, wherein the metering pump is a reciprocating pump, the stroke length of the movable part is set to be constant, and the number of strokes of the movable part is controlled based on the detection signal. apparatus.   The quantitative conveyance device according to claim 1 or 2, wherein the metering pump is a reciprocating pump, and the movable part is configured by using at least one of a diaphragm, a plunger, and a bellows.   The said constant pressure valve is comprised using the diaphragm provided in order to contact the fluid conveyed, and the urging means provided in order to urge | bias the said diaphragm to the said fluid side. The quantitative conveyance apparatus of any one of Claims.   5. The quantitative conveyance device according to claim 1, further comprising a display unit configured to display an actual discharge amount in the metering pump based on a discharge amount signal in the metering pump.   6. 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 in the metering pump and a predetermined deviation value set in advance is provided. The quantitative conveyance device according to item.

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