JP5186435B2 - Pump system - Google Patents

Description

  The present invention relates to a pump system for conveying fluid.

  Conventionally, various techniques have been proposed for a pump system and a control method for realizing pulsation-free. As this type of pump system, there are two pumps having the same shape, and each pump has one diaphragm, a cylinder, a plunger, a cylinder head, and the like (see, for example, Patent Document 1).

  This pump system is configured to reciprocate in a state where the plunger of one pump and the plunger of the other pump are out of phase, and the combined discharge amount of the two pumps is always constant. It is a pulsation pump system.

JP 2004-108188 A

  The pump system as described above uses two pumps of the same shape and is controlled and operated so as not to generate pulsation, but the degree of pulsation of each pump varies depending on conditions such as the viscosity and temperature of the carrier fluid. . In such a case, various pulsation corrections that can prevent pulsation due to various conditions such as the combination of pumps and conditions of the carrier fluid are required.

  This invention is made | formed in view of said situation, and makes it a subject to provide the pump system which can reduce the pulsation of a conveyance fluid as much as possible using various correction modes.

  In order to solve the above problems, the present invention has taken the following technical means.

That is, the pump system according to the present invention comprises at least two conveying members for conveying the carrier fluid in the conveying path by the reciprocating motion of a predetermined period, each conveying member, and a discharge stroke for discharging the carrier fluid, the carrier fluid A drive unit that drives a single cycle together with a suction stroke for sucking in, a flow rate signal detection unit that detects the flow rate of the transport fluid in the transport path, and a transport based on a flow rate signal measured by the flow rate signal detection unit In a pulsation rate calculation unit that calculates the pulsation rate of the fluid, a speed mode selection unit that allows selection of at least two cycles of the first cycle and the second cycle with respect to the cycle of the conveying member, For the standard mode that drives the conveying members in the acceleration section, constant speed section, and deceleration section, the constant speed section is extended from the standard mode constant speed section, and the standard mode acceleration section A correction method selection unit capable of selecting one or both of the sections and selecting a plurality of correction modes for driving the conveying member, and an extension width of the constant speed section extended in each correction mode with a plurality of correction degrees. A correction degree selection unit that can be set and selected as a combination, and at least two periods, a plurality of correction modes, and a plurality of correction degrees are combined, and the transport member is reciprocated without changing the period from the standard mode. The pulsation rate calculating unit calculates the pulsation rate for each combination, and adopts the combination having the lowest pulsation rate to convey the conveyance fluid. .

  According to such a configuration, each of at least two speed modes (first period, second period) by the speed mode selection unit, a plurality of correction modes by the correction method selection unit, and a plurality of correction degrees by the correction degree selection unit are combined. By calculating and comparing the pulsation rate of the carrier fluid when operating in each combination, it is possible to test many types of corrections and select the optimum combination. Thereby, the pulsation of the carrier fluid can be reduced as much as possible, and the optimum carrier fluid can be conveyed.

  Further, in the pump system according to the present invention, the correction method selection unit includes a first correction mode in which a deceleration section of the discharge stroke is shortened from a deceleration section of the standard mode and a constant speed section is extended, an acceleration section of the discharge stroke, A second correction mode for extending the constant speed section by shortening the deceleration section from the acceleration section and the deceleration section in the standard mode, and a third mode for extending the constant speed section by shortening the acceleration section for the discharge stroke from the acceleration section in the standard mode. The correction mode may be selectable.

  According to such a configuration, the three correction modes from the first correction mode to the third correction mode by the correction method selection unit, the speed mode, and the correction degree are combined, and the pulsation rate in each combination is calculated. By selecting this combination, it is possible to reduce the pulsation of the transport fluid as much as possible and realize the optimal transport of the transport fluid.

  Further, in the pump system according to the present invention, the correction degree selection unit includes a predetermined first correction degree, a second correction degree that greatly extends the constant velocity section than the first correction degree, and a second correction degree. The third correction degree that greatly extends the constant velocity section may be selectable.

  According to this configuration, the correction method selection unit combines the three correction degrees from the first correction degree to the third correction degree, the speed mode, and the correction method (correction mode), and calculates the pulsation rate in each combination. By selecting the combination that minimizes this, it is possible to reduce the pulsation of the transport fluid as much as possible and realize the optimal transport of the transport fluid.

  According to the present invention, the pulsation of the transport fluid can be reduced as much as possible using various correction modes.

It is a block diagram of a pump system. It is the standard speed waveform and correction speed waveform of the conveyance member in the high speed mode. It is a standard velocity waveform and a correction velocity waveform of the conveying member in the low speed mode. It is a time table in a high-speed mode. It is a timetable in low-speed mode.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. As shown in FIG. 1, the pump system according to the present invention includes a tank 109 that stores a carrier fluid, and a liquid feeding unit that is connected to the tank 109 and includes a carrier path (pipe) 110 that conveys the carrier fluid in a predetermined direction. 100, a transport member 103 that is connected to the transport path 110 and that pumps a transport fluid by a predetermined reciprocating motion, an operation unit 200 for operating the transport member 103, and a drive unit 101 that drives the transport member 103. And an operation unit 200 for operating the transport member 103, the drive unit 101, and the like, and a control unit 300 for controlling the transport member 103 and the drive unit 101 together with the operation unit 200.

  The conveyance path 110 is connected to the conveyance member 103 in the middle part thereof. A plurality (two in the illustrated example) of conveying members 103 are connected to the conveying path 110. In the conveyance path 110, a conveyance member 103 is connected to a pump head (pump chamber) 104 provided in the middle of the conveyance path 110. Accordingly, the transport member 103 is configured to suck the transport fluid into the pump head 104 by the reciprocating motion and to discharge the transport fluid to the outside of the pump head 104.

  The conveyance path 110 has a flow rate signal detection unit 106 on the downstream side of the conveyance member 103. Further, a three-way electric control valve 107 is provided on the downstream side of the flow rate signal detection unit 106 in the conveyance path 110, and a pressure gauge 108 is provided on the downstream side of the three-way electric control valve 107. A pipe 110 for returning a predetermined carrier fluid to the tank 109 is connected to the three-way electric control valve 107, and a pressure gauge 108 and a back pressure valve 111 are provided in the middle of the pipe 110.

  In the present embodiment, a plunger type is adopted for the conveying member 103. In addition to the plunger type, various types of other types such as a piston type, a diaphragm type, etc. are adopted as the conveying member 103. The transport member 103 is reciprocated at a predetermined cycle by the drive unit 101 to suck the transport fluid into the pump head 104 and discharge the sucked transport fluid to the downstream side of the transport path 110.

  In the transport path 110, a check valve 105 is provided on the upstream side (tank 109 side) of the transport member 103 to prevent the backflow of the transport fluid to the upstream side. Further, a check valve 105 is provided on the downstream side of the transport member 103 in the transport path 110 to prevent the backflow of the transport fluid discharged from the pump head 104 by the transport member 103 into the pump head 104.

  One driving unit 101 is provided for each of the two conveying members 103. In the present embodiment, for example, a linear actuator is employed for the drive unit 101. A linear actuator as the drive unit 101 controls the speed and displacement (position) of the conveying member 103 by current control. A displacement signal detector 102 that detects a signal related to the displacement (position) of the actuator is connected to the drive unit 101. 1 to 5, one of the two drive units 101 is indicated by # 1, and the other is indicated by # 2.

  The operation unit 200 is a speed at which the speed mode can be selected so that the operation / stop execution unit 201 that performs operation / stop of the pump system, the conveying member 103, and the drive unit 101 can be selectively driven at a plurality of cycles. A mode selection unit 202, a correction method selection unit 203 capable of selecting and setting a plurality of correction methods (correction modes) for reducing the pulsation of the transport fluid, and correction of the correction method selected by the correction method selection unit 203 The correction degree selection unit 204 that can select and set the degree (correction degree), the speed mode (cycle) of the speed mode selection unit 202, the correction method of the correction method selection unit 203, and the correction degree of the correction degree selection unit 204 are combined. The auto-tuning execution unit 205 that performs optimal pulsation correction, the effective area setting unit 206 that sets the effective area of the transfer member 103, and the flow rate of the transfer fluid can be selected and set. Having such a flow rate setting unit 207, a pulsation rate calculating section 208 for calculating a ripple factor of the carrier fluid of the conveying path 110, information for the user to use a pump system, a display unit 209 for displaying the setting item, a.

  The operation / stop execution unit 201 executes each mode of operation, stop, and standby of the pump system. The operation / stop execution unit is configured such that each mode is automatically controlled by the operation unit 200. In addition, an operation button linked to the operation / stop execution unit 201 may be provided in the operation unit 200 so that each mode can be operated by a user of the pump system.

  The speed mode selection unit 202 is configured to be able to select two speed modes, a high speed mode and a low speed mode, for the operation speed of the pump. This speed mode relates to the operation cycle of the conveying member 103 and the drive unit 101. That is, the conveyance member 103 and the drive unit 101 are operated at a predetermined cycle (the cycle of the conveyance member 103 and the drive unit 101 is the same), but the cycle of the conveyance member 103 and the drive unit 101 in the high speed mode and the low speed mode. Is different. Specifically, the cycle of the conveyance member 103 and the drive unit 101 in the high speed mode is smaller than the cycle of the low speed mode.

  This point will be described in detail with reference to FIGS. FIG. 2A shows the speed waveform of the conveying member 103 when the pump system is normally operated (standard mode) in the high speed mode, and FIG. 3A is the normal operation (standard mode) of the pump system in the low speed mode. The velocity waveform of the conveyance member 103 at the time is shown. Hereinafter, the velocity waveforms according to FIGS. 2A and 3A are referred to as “velocity waveforms in the standard mode”. In this embodiment, two types of speed modes, a high speed mode and a low speed mode, are prepared as standard modes.

  2 and 3, the vertical axis represents the speed of the conveying member 103 and the horizontal axis represents time. As shown in FIG. 2 and FIG. 3, the conveying member 103 combines the discharge stroke for discharging the carrier fluid from the pump head 104 and the suction stroke for sucking the carrier fluid into the pump head 104 to form one cycle (period). Repeat this.

  The cycle of the conveying member 103 is different between the high speed mode and the low speed mode. In the high-speed mode of FIG. 2, the cycle of the conveying member 103 is 1 second (hereinafter, the cycle in the high-speed mode is referred to as “first cycle”). The cycle in the low-speed mode in FIG. 3 is 2 seconds longer than the cycle in the high-speed mode (hereinafter, the cycle in the low-speed mode is referred to as “second cycle”).

  In the velocity waveform in the standard mode, for example, as shown in FIG. 2A and FIG. 3A, the discharge stroke is performed at an equal speed after the acceleration section in which the conveying member 103 is moved at a predetermined acceleration and after the acceleration section ends. It has a constant speed section in which the transport member 103 is moved, and a deceleration section in which the transport member 103 is decelerated after the end of the constant speed section.

  The acceleration interval in the discharge stroke is 0.1 seconds (see FIG. 2) in the high speed mode and 0.2 seconds (see FIG. 3) in the low speed mode. Further, the constant velocity section in the discharge stroke is 0.4 seconds in the high speed mode and 0.8 seconds in the low speed mode. Further, the deceleration section in the discharge stroke is 0.1 second in the high speed mode and 0.2 second in the low speed mode.

  In the suction stroke, the transport member 103 is moved in the opposite direction to that in the discharge stroke in order to generate a negative pressure in the pump head 104 and suck the transport fluid. The intake stroke includes an acceleration section in which the transport member 103 is moved at a predetermined acceleration, a constant speed section in which the transport member 103 is moved at a constant speed after the end of the acceleration stroke, and a transport member 103 at a predetermined acceleration after the end of the constant speed section. And a decelerating section for decelerating and moving.

  The acceleration interval in the suction stroke is 0.1 seconds in the high speed mode and 0.2 seconds in the low speed mode. Further, the constant velocity section in the suction stroke is 0.2 seconds in the high speed mode and 0.4 seconds in the low speed mode. Further, the deceleration zone in the suction stroke is 0.1 second in the high speed mode and 0.2 second in the low speed mode.

  2 and 3, the speed waveform of one of the two conveying members 103 is indicated by a solid line, and the velocity waveform of the other conveying member 103 is indicated by a broken line. As shown in FIGS. 2 and 3, the velocity waveforms of the two conveying members 103 are the same, but the velocity waveform of one conveying member 103 and the velocity waveform of the other conveying member 103 are time axes (horizontal axes). With respect to each other. Specifically, the start time of the deceleration section in the speed waveform (solid line) of one transport member 103 and the start time of the acceleration section of the speed waveform (broken line) of the other transport member 103 are set to coincide. Yes.

  Furthermore, the deceleration section of one transport member 103 and the acceleration section of the other transport member 103 coincide (see FIGS. 2A and 3A). That is, the deceleration section of one transport member 103 and the acceleration section of the other transport member 103 are set to start simultaneously and end simultaneously. Similarly, the acceleration section of one transport member 103 and the deceleration section of the other transport member 103 are set to start at the same time and end at the same time.

  The correction method selection unit 203 is configured to be able to select three correction methods (modes) of a first correction mode, a second correction mode, and a third correction mode. Hereinafter, this correction method will be described with reference to FIGS.

  The first correction mode is different from the velocity waveform in the standard mode in the following points. That is, in the first correction mode, as shown in FIGS. 2B and 3B, the speeds of the two conveying members 103 in the deceleration section are operated so as to be different from the speed waveforms in the standard mode. Specifically, in the velocity waveform of the conveying member 103 indicated by a broken line, the constant velocity section is extended as compared with the velocity waveform in the standard mode (the end point of the uniform velocity section is later than in the standard mode).

  Moreover, after the end of the constant velocity section, the standard mode deceleration is performed in the deceleration section in the first correction mode so that the end point of the deceleration section in the first correction mode is the same as the end point of the deceleration section in the standard standard mode. The conveyance member 103 is decelerated at an acceleration larger than the acceleration in the section.

  In the second correction mode, as in the first correction mode, the constant velocity sections of the two conveying members 103 are extended from the speed waveform of the standard mode, and the end point of the deceleration section is the deceleration section of the speed waveform of the standard mode. The conveyance member 103 is moved at an acceleration larger than the acceleration in the deceleration section of the speed waveform in the standard mode so as to be the same as the end point.

  In addition, in the second correction mode, in the velocity waveforms of the two transport members 103, the acceleration section is shortened compared to the acceleration section in the standard mode, and the acceleration of the transport member 103 in this acceleration section is the acceleration in the standard mode. It is made larger than the acceleration of the section. In addition, the starting point of the constant speed section becomes earlier than the constant speed section in the standard mode, and the constant speed section is extended.

  In the third correction mode, the acceleration of the acceleration section of the two conveying members 103 is made larger than the acceleration section in the speed waveform of the standard mode, the acceleration section is shortened compared to the standard mode, and the start time of the constant speed section (acceleration section) The constant speed section is extended by accelerating the time point of ending.

  In each correction mode, the amount of the transport fluid discharged in the discharge stroke increases as described above. Correspondingly, in order to be able to inhale the same amount of carrier fluid in the intake stroke, it is driven so that the intake amount in the intake stroke in each correction mode is increased compared to the intake stroke in the speed waveform in the standard mode. The conveyance member 103 is moved through the unit 101.

  The correction degree selection unit 204 is configured to be able to select three correction degrees: a first correction degree, a second correction degree, and a third correction degree. Here, the “correction degree” refers to the degree of extension (extension width, unit: [second]) when the constant velocity section is extended in the above correction mode. In the present embodiment, the second correction degree is set larger than the first correction degree, and the third correction degree is set larger than the second correction degree.

  For example, in the first correction mode of the high speed mode (FIG. 2B), when the first correction degree is applied, the constant speed interval in the discharge stroke of the standard mode is 0.4 seconds (FIG. 2A). The range of 0.1 second to 0.5 second and the range of 0.6 second to 1.0 second), whereas the constant velocity section of the first correction mode is 0.42 second (FIG. 2B). ) And FIG. 4, a section obtained by subtracting 0.1 second of the acceleration section from t11, and a section obtained by subtracting 0.1 second of the acceleration section from t′11 (0.52 seconds−0.1 seconds)), and 0 .02 seconds will be extended. In this case, the deceleration section in the velocity waveform in the first correction mode is shortened from 0.1 seconds in the standard mode to 0.08 seconds. 4 and 5 are tables showing the relationship between the numerical values related to t11 to t31 and t'11 to t'31 shown in FIGS. 2 and 3, the correction mode, and the correction degree. The unit of numerical values shown in FIGS. 4 and 5 is [second].

  In the first correction mode of the high speed mode, when the second correction degree is applied, the constant speed section in the discharge stroke of the standard mode is 0.4 seconds, whereas the constant speed section of the first correction mode is It becomes 0.44 seconds (refer to FIG. 4, 0.54 seconds (t11, t′11) −0.1 seconds), and is extended by 0.04 seconds. In this case, the discharge stroke deceleration interval in the velocity waveform of the first correction mode is shortened from 0.1 seconds in the standard mode to 0.06 seconds.

  In the first correction mode of the high speed mode, when the third correction degree is applied, the constant speed section in the discharge stroke of the standard mode is 0.4 seconds, whereas the constant speed section of the first correction mode is It becomes 0.46 seconds (refer to FIG. 4, 0.56 seconds (t11, t′11) −0.1 seconds), and is extended by 0.06 seconds. In this case, the discharge stroke deceleration interval in the velocity waveform of the first correction mode is shortened from 0.1 seconds in the standard mode to 0.04 seconds.

  In the second correction mode of the high speed mode (FIG. 2C), when the first correction degree is applied, the constant speed section in the discharge stroke of the standard mode is 0.4 seconds, while the second correction mode is applied. The constant speed section in the correction mode is 0.44 seconds (in FIG. 2C and FIG. 4, a section obtained by subtracting t21 (0.08 seconds) from t22 (0.52 seconds), and t′22 (0. 52 seconds) to t′21 (0.08 seconds)), which is extended by 0.04 seconds. In this case, the discharge stroke acceleration interval in the velocity waveform of the second correction mode is shortened from 0.1 seconds in the standard mode to 0.08 seconds. In addition, the discharge stroke deceleration section in the velocity waveform is shortened from 0.1 seconds in the standard mode to 0.08 seconds.

  In the second correction mode of the high speed mode, when the second correction degree is applied, the constant speed section in the discharge stroke of the standard mode is 0.4 seconds, whereas the constant speed section of the second correction mode is Becomes 0.48 seconds (0.54 seconds (t22, t′22) −0.06 seconds (t21, t′21)), and is extended by 0.08 seconds. In this case, the discharge stroke acceleration interval in the velocity waveform of the second correction mode is shortened from 0.1 seconds in the standard mode to 0.06 seconds. Also, the discharge stroke deceleration section in the velocity waveform is shortened from 0.1 seconds in the standard mode to 0.06 seconds.

  In the second correction mode of the high speed mode, when the third correction degree is applied, the constant speed section in the discharge stroke of the standard mode is 0.4 seconds, whereas the constant speed section of the second correction mode is Becomes 0.52 seconds (0.56 seconds (t22, t′22) −0.04 seconds (t21, t′21)), and is extended by 0.12 seconds. In this case, the discharge stroke acceleration interval in the velocity waveform of the second correction mode is shortened from 0.1 seconds in the standard mode to 0.04 seconds. Further, the deceleration interval of the discharge stroke in the velocity waveform is shortened from 0.1 second to 0.04 second.

  In the third correction mode of the high speed mode (FIG. 2D), when the first correction degree is applied, the constant speed section of the discharge stroke in the standard mode is 0.4 seconds, whereas 3 The constant speed section of the correction mode is 0.42 seconds (in FIG. 2D and FIG. 4, the acceleration section shortened from the standard mode acceleration section of 0.1 seconds to the standard mode constant speed section of 0.4 seconds. A section obtained by subtracting t31 or t′31 (0.08 seconds) (a section obtained by adding 0.02 seconds)) is extended by 0.02 seconds. In this case, the discharge stroke acceleration interval in the velocity waveform of the third correction mode is shortened from 0.1 seconds in the standard mode to 0.08 seconds.

  When the second correction degree is applied in the third correction mode of the high speed mode, the constant speed section of the discharge stroke in the standard mode is 0.4 seconds, whereas the constant speed section of the third correction mode is Becomes 0.44 seconds (refer to FIG. 2D and FIG. 4, 0.4 seconds + (0.1 seconds−0.06 seconds)), and is extended by 0.04 seconds. In this case, the discharge stroke acceleration interval in the velocity waveform of the third correction mode is shortened from 0.1 seconds in the standard mode to 0.06 seconds.

  When the third correction degree is applied in the third correction mode of the high speed mode, the constant speed section of the discharge stroke in the standard mode is 0.4 seconds, whereas the constant speed section of the third correction mode is Becomes 0.46 seconds (refer to FIG. 2D and FIG. 4, 0.4 seconds + (0.1 seconds−0.04 seconds)), and is extended by 0.06 seconds. In this case, the discharge stroke acceleration period in the velocity waveform of the third correction mode is shortened from 0.1 seconds in the standard mode to 0.04 seconds.

  When the first correction degree is applied in the first correction mode in the low speed mode (FIG. 3B), the constant speed interval in the standard mode is 0.8 seconds (refer to FIG. 3 to 1.0 seconds and 1.2 seconds to 2.0 seconds), while the constant velocity section in the first correction mode is 0.84 seconds (FIG. 3B). 5, a section obtained by subtracting 0.2 second of the acceleration section from t11 (1.04 seconds), or a section obtained by subtracting 0.2 seconds of the acceleration section from t′11 (1.04 seconds)) Thus, an extension of 0.04 seconds is made. In this case, the discharge stroke deceleration interval in the velocity waveform of the first correction mode is shortened from 0.2 seconds in the standard mode to 0.16 seconds.

  When the second correction degree is applied in the first correction mode in the low speed mode, the constant speed section in the first correction mode is 0.88 while the constant speed section in the standard mode is 0.8 seconds. Second (refer to FIG. 3B and FIG. 5, 1.08 seconds (t11, t′11) −0.2 seconds (acceleration section)), and is extended by 0.08 seconds. In this case, the discharge stroke deceleration interval in the velocity waveform of the first correction mode is shortened from 0.2 seconds in the standard mode to 0.12 seconds.

  When the third correction degree is applied in the first correction mode in the low speed mode, the constant speed section in the standard correction mode is 0.8 seconds, whereas the constant speed section in the first correction mode is 0.92 seconds. (Refer to FIG. 3 (b) and FIG. 5) 1.12 seconds (t11, t′11) −0.2 seconds (acceleration section)), which is extended by 0.12 seconds. In this case, the deceleration section in the velocity waveform in the first correction mode is shortened from 0.2 seconds in the standard mode to 0.08 seconds.

  When the first correction degree is applied in the second correction mode in the low speed mode, the constant speed section in the standard mode is 0.8 seconds (FIG. 3A), while the second correction mode has the same speed. The speed section is 0.88 seconds (refer to FIG. 3C and FIG. 5, the section obtained by subtracting the section t21 (0.16 seconds) from the section t22 (1.04 seconds), and the section t′22. (Section obtained by subtracting the section of t′21 (0.16 seconds) from (1.04 seconds)), and is extended by 0.08 seconds. In this case, the acceleration section in the second correction mode is shortened from 0.2 seconds in the standard mode to 0.16 seconds. Further, the deceleration section in the second correction mode is shortened from 0.2 seconds in the standard mode to 0.16 seconds.

  When the second correction degree is applied in the second correction mode of the low speed mode, the constant speed section of the standard correction mode is 0.8 seconds, whereas the constant speed section of the second correction mode is 0.96 seconds. (Refer to FIG. 3C and FIG. 5, 1.08 seconds (t22, t′22) −0.12 seconds (t21, t′21)), which is extended by 0.16 seconds. In this case, the acceleration interval in the second correction mode is shortened from 0.2 seconds in the standard mode to 0.12 seconds. Further, the deceleration section in the second correction mode is shortened from 0.2 seconds in the standard mode to 0.12 seconds.

  When the third correction degree is applied in the second correction mode of the low speed mode, the constant speed section of the standard mode is 0.8 seconds while the constant speed section of the second correction mode is 1.04 seconds. (Referring to FIG. 3C and FIG. 5, 1.12 seconds (t22, t′22) −0.08 seconds (t21, t′21)), which is extended by 0.24 seconds. In this case, the acceleration interval in the second correction mode is shortened from 0.2 seconds in the standard mode to 0.08 seconds. Further, the deceleration section in the second correction mode is shortened from 0.2 seconds in the standard mode to 0.08 seconds.

  When the first correction degree is applied in the third correction mode in the low speed mode, the constant speed section in the standard mode is 0.8 seconds (see FIG. 3A), whereas in the third correction mode, The constant speed section is 0.84 seconds (refer to FIG. 3 (d) and FIG. 5), the acceleration section shortened from the constant speed section of 0.8 seconds to the standard mode acceleration section of 0.2 seconds. A section obtained by adding 0.04 seconds to a section obtained by subtracting 0.16 seconds, which is a section of t31 or t′31, is extended by 0.04 seconds. In this case, the acceleration interval in the third correction mode is shortened from 0.2 seconds in the standard mode to 0.16 seconds.

  When the second correction degree is applied in the third correction mode in the low speed mode, the constant speed section in the standard mode is 0.8 seconds, whereas the constant speed section in the third correction mode is 0.88 seconds. (Refer to FIG. 3D and FIG. 5, 0.8 seconds + (0.2 seconds−0.12 seconds (t31, t′31))), which is extended by 0.08 seconds. In this case, the acceleration interval in the third correction mode is shortened from 0.2 seconds in the standard mode to 0.12 seconds.

  When the third correction degree is applied in the third correction mode in the low speed mode, the constant speed section in the standard correction mode is 0.8 seconds, whereas the constant speed section in the third correction mode is 0.92 seconds. (Refer to FIG. 3D and FIG. 5, 0.8 seconds + (0.2 seconds−0.08 seconds (t31, t′31))), which is extended by 0.12 seconds. In this case, the acceleration interval in the third correction mode is shortened from 0.2 seconds in the standard mode to 0.08 seconds.

  The auto-tuning execution unit 205 is for executing the operation of the pump system by combining the high-speed mode, the speed mode of the low-speed mode, the correction mode, and the correction degree. The effective area setting unit 206 is for setting an effective area for the transfer member 103 to transfer the transfer fluid. The flow rate setting unit 207 is configured to select and set the flow rate of the transport fluid in the transport path 110.

  The pulsation rate calculation unit 208 calculates the pulsation rate of the carrier fluid based on the flow rate signal transmitted from the flow rate signal detection unit 106.

This pulsation rate (X) is calculated by the following equation.
X = 1/2 * {(Qmax-Qmin) / Qave} * 100 [±%]

  Here, Qmax is the maximum value of the flow rate of the carrier fluid within a predetermined time, and Qmin is the minimum value of the flow rate of the carrier fluid within the same predetermined time. Further, Qave is an average flow rate of the transport fluid within the same predetermined time.

  The display unit 209 is configured to be able to display various types of information such as the type, flow rate, speed mode, correction method (correction mode), correction degree, effective area of the transfer member 103, pulsation rate, and the like. The display unit 209 may be a touch panel system, and a predetermined numerical value may be input via the display unit 209.

  The control unit 300 includes a set value calculation unit 301, a target displacement table 302, a displacement feedback signal processing unit 303, an operation control unit 304, a current control unit 305, and a drive control unit 306. The control unit 300 includes two target displacement tables 302, two displacement feedback signal processing units 303, two operation control units 304, and two current control units corresponding to the two transport members 103 and the two drive units 101. 305 and two drive control units 306 are provided.

  The set value calculation unit 301 receives the setting signal set by the operation unit 200, performs a predetermined calculation based on this, and transmits a signal related to the calculation result to the target displacement table 302. Thereby, a predetermined velocity waveform of the conveying member 103 is set. The target displacement table 302 writes the signal transmitted from the set value calculation unit 301 to the displacement table, and simultaneously creates and saves the data file. The displacement feedback signal processing unit 303 converts the analog signal from the displacement signal detection unit 102 into a digital signal.

  The operation control unit 304 performs control of the operation mode set / selected by the operation unit 200 and comparison calculation processing of the signal of the target displacement table 302 and the signal detected by the displacement feedback signal processing unit 303. The current control unit 305 controls the amount of current sent to the drive control unit 306 in order to control the drive unit 101. The drive control unit 306 drives the drive unit 101 at a predetermined cycle by controlling the timing at which the current sent from the current control unit 305 is sent to the drive unit 101.

  In the pump system configured as described above, the auto-tuning execution unit includes a speed mode (high-speed mode or low-speed mode) of the speed mode selection unit, a correction mode (first correction mode to third correction mode) of the correction method selection unit, and a correction degree selection. The units (first correction degree to third correction degree) are sequentially combined, and the transfer fluid is tested and transferred for a predetermined time for all the correction combinations (for example, a combination of the high speed mode, the first correction mode, and the first correction degree). , A combination of the high speed mode, the first correction mode, and the second correction degree,... At this time, the first period and the second period in each correction combination do not change between the case of the standard mode and the case where the correction is applied. That is, even if each correction mode and each correction degree are applied in the first period, the period does not change in 1 second, and even if each correction mode and each correction degree is applied in the second period, The period does not change in 2 seconds.

  The pulsation rate calculation unit calculates the pulsation rate of the carrier fluid for all the above correction combinations. The auto-tuning executing unit compares the pulsation rates for all the correction combinations, and identifies the correction combination having the lowest pulsation rate. Using the combination of corrections identified in this way, the auto-tuning execution unit transmits a control signal to the operation control unit 304 so as to execute the transfer of the transfer fluid.

  Thus, the pump system can reduce the pulsation due to various conditions of the viscosity, pressure, and temperature of the transport fluid as much as possible, and can realize the optimum pulsation-free transport of the transport fluid.

  Note that the present invention is not limited to the above-described embodiment, and can be changed or modified as appropriate without departing from the spirit of the invention.

  For example, in the above-described embodiment, the example in which the cycle of the high-speed mode of the speed mode is 1 second and the cycle of the low-speed mode is 2 seconds has been described. it can. In the above embodiment, the pump system capable of selecting two speed modes, the high speed mode and the low speed mode, is exemplified. However, the present invention is not limited to this, and three or more (at least two or more) speed modes can be selected. You may comprise.

  Moreover, in the said embodiment, although the pump system which can select three kinds of correction degrees, a 1st correction degree, a 2nd correction degree, and a 3rd correction degree, was illustrated about the correction degree, it is not restricted to this but two types or You may comprise so that four or more types of correction | amendment degrees can be selected.

  In the above-described embodiment, an example in which the pulsation rate is calculated based on the flow rate signal of the transport fluid flowing through the transport path 110 has been shown. Is also possible.

  Further, the acceleration section, the constant speed section, and the deceleration section in the discharge process and the suction process are not limited to the numerical values exemplified in the above embodiment, and can be appropriately changed according to the magnitudes of the first period and the second period.

  In the above embodiment, the second correction degree is larger than the first correction degree and the third correction degree is larger than the second correction degree. However, the present invention is not limited to this. In addition to making the second correction degree smaller than the second correction degree and making the third correction degree smaller than the second correction degree, the first correction degree to the third correction degree can be appropriately changed.

  DESCRIPTION OF SYMBOLS 100 ... Liquid feeding part, 101 ... Drive part, 102 ... Displacement signal detection part, 103 ... Conveyance member, 104 ... Pump head, 105 ... Check valve, 106 ... Flow rate signal detection part, 107 ... Three-way electric control valve, 108 DESCRIPTION OF SYMBOLS ... Pressure gauge, 109 ... Tank, 110 ... Conveyance path, 111 ... Back pressure valve, 200 ... Operation part, 201 ... Operation / stop execution part, 202 ... Speed mode selection part, 203 ... Correction method selection part, 204 ... Correction degree selection , 205: Auto tuning execution unit, 206 ... Effective area setting unit, 207 ... Flow rate setting unit, 208 ... Pulsation rate calculation unit, 209 ... Display unit, 300 ... Control unit, 301 ... Set value calculation unit, 302 ... Target displacement Table 303: Displacement feedback signal processing unit 304 ... Operation control unit 305 ... Current control unit 306 ... Drive control unit

Claims (3)

At least two transport members for transporting the transport fluid in the transport path by reciprocating motion of a predetermined cycle, and each transport member including a discharge stroke for discharging the transport fluid and a suction stroke for sucking the transport fluid are combined. A drive unit that drives as one cycle, a flow rate signal detection unit that detects the flow rate of the transport fluid in the transport path,
A pulsation rate calculation unit that calculates the pulsation rate of the transport fluid based on the flow rate signal measured by the flow rate signal detection unit, and a speed at which at least two cycles of the first cycle and the second cycle can be selected for the cycle of the transfer member A mode selector,
In the delivery stroke of the carrier fluid, the standard mode for driving the conveying members in the predetermined acceleration section, constant speed section, and deceleration section is extended with the constant speed section from the constant speed section of the standard mode and accelerated in the standard mode. One or both of the section and the deceleration section are shortened, and a correction method selection unit capable of selecting a plurality of correction modes for driving the conveying member;
A correction degree selection unit that can be selected by setting the extension width of the constant velocity section extended in each correction mode as a plurality of correction degrees, and
At least two cycles, a plurality of correction modes, and a plurality of correction degrees are combined, and the transfer member is reciprocated without changing the cycle from the standard mode to transfer the transfer fluid, and each combination is performed by the pulsation rate calculation unit. A pump system configured to calculate a pulsation rate with respect to and to convey a carrier fluid using a combination having the lowest pulsation rate.   The correction method selection unit includes a first correction mode for extending a constant speed section by shortening a deceleration section of the discharge stroke from a deceleration section of the standard mode, and an acceleration section and a deceleration section of the standard stroke as an acceleration section and a deceleration section of the discharge stroke. A second correction mode that shortens the section and extends the constant speed section and a third correction mode that shortens the acceleration section of the discharge stroke from the acceleration section of the standard mode and extends the constant speed section can be selected. The pump system according to claim 1.   The correction degree selection unit includes a predetermined first correction degree, a second correction degree that extends the constant speed section more greatly than the first correction degree, and a third correction that extends the constant speed section larger than the second correction degree. The pump system according to claim 1, wherein the pump system is configured to be selectable.

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