TW201622339A - Apparatus and method for controlling an electro-magnetic reciprocating pump - Google Patents

Abstract

In an apparatus for controlling an electro-magnetic reciprocating pump, a current sensor (64) for detecting a current passing through a solenoid coil (44), a switching element (62) for turning on and off a DC voltage applied to the solenoid coil (44), and a computation circuit (61) for generating control signals for turning on and off the switching element (62) are included. The control signals contain a first signal and a second signal, wherein the first signal repeats the operation, at a predetermined period [Delta]Ts, of turning off the switching element (62) after a predetermined period [Delta]Ton has elapsed after the switching element (62) was turned on, and the second signal turns off the switching element (62) when the detected current value is raised to a predetermined upper threshold value within the predetermined period [Delta]Ton, and turns on the switching element (62) when the detected current value is lowered to a predetermined lower threshold value. Thereby the apparatus is capable of coping with different source voltages while the power consumption is reduced and the temperature rise of the solenoid coil is suppressed.

Description

Control device of electromagnetic reciprocating pump and control method thereof

The present invention relates to a control device and a control method for an electromagnetic reciprocating pump. More specifically, the present invention relates to a control device for a pump that reciprocates a film, a plunger, a piston, or the like by a direct-acting electromagnetic tube, and a control method therefor.

In the past, in the case of a pump for transporting liquid, an electromagnetic plunger pump or an electromagnetic diaphragm pump is used, which electromagnetically applies a pulse voltage to the electromagnetic coil to intermittently excite the electromagnetic coil. This causes the plunger or the piston to reciprocate (for example, refer to Patent Document 1), and the electromagnetic diaphragm pump reciprocates the diaphragm by replacing the plunger or the piston with the same configuration (for example, refer to the patent document) 2). The electromagnetic piston pump described in Patent Document 1 or the electromagnetic diaphragm pump described in Patent Document 2 corresponds to a single DC power supply voltage, and when corresponding to a different power supply voltage, the electromagnetic coil or the control device must be changed to Corresponding to different voltages.

On the other hand, there is a control circuit for an electromagnetic reciprocating pump which is capable of using the same control device even if the power supply voltage is different, for example, 100V or 200V. In the manner of the electromagnetic coil, the pulse voltage is supplied to the electromagnetic coil by converting the power supply voltage into a predetermined voltage by PWM (for example, refer to Patent Document 3). Although the PWM control is, for example, a high frequency of 1 to 2 kHz, the input voltage is turned on. Turn off, thereby performing voltage conversion, but only when the input voltage is turned on. Turning off will cause ripples in the current flowing through the solenoid. This chopping does not contribute to the thrust of the electromagnetic coil, and heat loss occurs, causing the temperature of the electromagnetic coil to rise. Therefore, in the control device described in Patent Document 3, although different voltages can be used, there is a problem that power consumption is large and the temperature of the electromagnetic coil is increased.

(previous technical literature) (Patent Literature)

Patent Document 1: Japanese Unexamined Patent Publication No. Hei-4-62368

Patent Document 2: Japanese Patent Laid-Open No. Hei 6-173749

Patent Document 3: Japanese Patent Laid-Open Publication No. 2001-153058

However, the thrust generated in the electromagnetic coil is calculated in such a manner as to (current flowing through the electromagnetic coil × number of turns of the electromagnetic coil). However, in the control device of the prior art described in Patent Documents 1 to 3, the thrust of the electromagnetic coil is controlled not by the control current but by the control voltage, so that the electric power required to generate the thrust is supplied to the electromagnetic The coil causes a problem of an increase in power consumption or an increase in the temperature of the electromagnetic coil.

Therefore, the control device of the electromagnetic reciprocating pump of the present invention has The purpose is to reduce power consumption and suppress the temperature rise of the electromagnetic coil, and can correspond to different power supply voltages.

A control device for an electromagnetic reciprocating pump driven by a direct-acting electromagnetic tube having an electromagnetic coil and an armature reciprocatingly among the electromagnetic coils, the control of the electromagnetic reciprocating pump The device includes: a current sensor for detecting a current flowing through the electromagnetic coil; a switching element for turning on/off a DC voltage applied to the electromagnetic coil; and an arithmetic circuit for generating the switching element a control signal for turning on/off; and the control signal includes a first signal and a second signal, wherein the first signal repeats the operation of the predetermined period: after the switching element is turned on, after a predetermined period of time Is turned off, and the second signal is set to be turned off when the detected current value detected by the current sensor rises to a predetermined upper limit threshold within the predetermined period, and when the foregoing After the detected current value falls to a predetermined lower limit threshold, the switching element is turned on.

In the control device for the electromagnetic reciprocating pump of the present invention, it is preferable that the upper limit threshold value and the lower limit threshold value are changed in response to an elapsed time after the switching element is turned on by the first signal.

In the control device for the electromagnetic reciprocating pump of the present invention, the DC voltage applied to the electromagnetic coil is preferably a DC voltage obtained by full-wave rectifying the AC voltage.

In the control device for the electromagnetic reciprocating pump of the present invention, the timing of switching the positive and negative signals of the first signal from the alternating voltage waveform should also be made. The aforementioned switching element is turned on by a timing delayed by a predetermined time.

An electromagnetic reciprocating pump control system comprising: a direct-acting electromagnetic tube, comprising an electromagnetic coil and an armature reciprocatingly moving among the electromagnetic coils; and a current sensor for detecting circulation a current of the electromagnetic coil; and a switching element for turning on/off a DC voltage applied to the electromagnetic coil; the electromagnetic reciprocating pump is controlled by repeating the following operation at a predetermined cycle: setting the aforementioned switching element to After being turned on, it is turned off after a predetermined period of time; and, in the predetermined period, when the detected current value detected by the current sensor rises to a predetermined upper limit value, the switching element is turned off. The switch element is turned on when the detected current value drops to a predetermined lower limit threshold.

In the method of controlling an electromagnetic reciprocating pump according to the present invention, it is preferable that the upper limit threshold value and the lower limit threshold value are changed in response to an elapsed time after the switching element is turned on in the predetermined period.

In the control method of the electromagnetic reciprocating pump of the present invention, the DC voltage applied to the electromagnetic coil is preferably a DC voltage obtained by full-wave rectifying the AC voltage, and the timing of switching from the positive and negative voltages of the AC voltage waveform The timing of the predetermined time is delayed, and the aforementioned switching element is turned on in the predetermined period.

The control device for the electromagnetic reciprocating pump of the present invention achieves an effect of reducing power consumption and suppressing temperature rise of the electromagnetic coil, and can correspond to different power supply voltages.

10‧‧‧ Pump Department

11a‧‧‧Inhalation tube

11b‧‧‧ spit tube

12‧‧‧Inhalation flow path

13‧‧‧Spit out the flow path

14‧‧‧ recess

15‧‧‧Sucking side check valve

16‧‧‧Spread side check valve

17, 22‧‧‧ base

18‧‧‧ fitting recess

19‧‧‧ facing the face

20‧‧‧ Drive Department

23‧‧‧through holes

24‧‧‧Protruding

26‧‧‧ pedestal

27‧‧‧ Face

28‧‧‧Slots

29, 52‧‧‧ bolts

30‧‧‧ chamber

31‧‧‧Teflon film

32‧‧‧Seat

40‧‧‧Direct-acting electromagnetic tube

41‧‧‧Shell

42‧‧‧ points

43‧‧‧ bottom

44‧‧‧Electromagnetic coil

45‧‧‧ Armature

46‧‧‧Return spring

47‧‧‧ Output shaft

50‧‧‧ frame

51‧‧‧stops

60, 160‧‧‧ control devices

61‧‧‧ calculus circuit

62‧‧‧Switching elements

63‧‧‧ diode

64‧‧‧ Current Sensor

65‧‧‧Input and output

66‧‧‧Start stop button

67‧‧‧Rectifier

68‧‧‧Zero cross detection circuit

70‧‧‧DC power supply

71‧‧‧ positive side circuit

72‧‧‧negative side circuit

73‧‧‧Input circuit

74‧‧‧Output circuit

75‧‧‧Connected circuit

80‧‧‧AC power supply

81, 82‧‧‧ connecting lines

100‧‧‧Electromagnetic reciprocating pump

Fig. 1 is an explanatory view showing a configuration of a control device according to an embodiment of the present invention and an electromagnetic reciprocating pump to which the control device is applied.

Fig. 2A is an explanatory view showing the discharge operation of the electromagnetic reciprocating pump.

Fig. 2B is an explanatory view showing the suction operation of the electromagnetic reciprocating pump.

Fig. 2C is a timing chart showing the basic operation of the electromagnetic reciprocating pump.

Fig. 3 is a flow chart showing the action of the case where the set value parameter (1) in the control device of the present invention is applied.

Fig. 4 is a flow chart showing the action of the case where the set value parameter (2) in the control device of the present invention is applied.

Fig. 5 is a flow chart showing the action of the case where the set value parameter (2) is applied to the control device of the present invention.

Fig. 6 is a flow chart showing the action of the case where the set value parameter (2) in the control device of the present invention is applied.

Fig. 7 is a flow chart showing the action of the case where the set value parameter (2) in the control device of the present invention is applied.

Fig. 8A is a set value parameter (1) stored in the calculation circuit of the control device of the embodiment of the present invention.

Fig. 8B is a set value parameter (2) stored in the calculation circuit of the control device of the embodiment of the present invention.

Fig. 9A is a graph showing changes in the stroke S of the electromagnetic reciprocating pump driven by the control device of the embodiment of the present invention when the power source voltage is 100 V DC.

Fig. 9B is a graph showing a change in the current I of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device of the embodiment of the present invention when the power supply voltage is 100 V DC.

Fig. 9C is a graph showing changes in the applied voltage V of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device of the embodiment of the present invention when the power supply voltage is 100 V DC.

Fig. 10A is a graph showing the change in the stroke S of the electromagnetic reciprocating pump driven by the control device of the embodiment of the present invention when the power supply voltage is 200 V DC.

Fig. 10B is a graph showing a change in the current I of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device of the embodiment of the present invention when the power supply voltage is 200 V DC.

Fig. 10C is a graph showing a change in the applied voltage V of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device of the embodiment of the present invention when the power supply voltage is 200 V DC.

Fig. 10D is a graph showing changes in the applied voltage V of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device of the embodiment of the present invention when the power supply voltage is 200 V DC.

Fig. 11 is an explanatory view showing a configuration of a control device according to another embodiment of the present invention and an electromagnetic reciprocating pump to which the control device is applied.

Fig. 12A is an explanatory view showing an AC power supply voltage waveform and zero-crossing detection according to another embodiment of the present invention.

Fig. 12B is an explanatory view showing a rectified voltage waveform according to another embodiment of the present invention.

Fig. 12C is an explanatory view showing a supply voltage of an electromagnetic coil according to another embodiment of the present invention.

Fig. 13 is a flow chart showing the operation of the control device in the case where the set value parameter (1) is applied to another embodiment of the present invention.

Fig. 14 is a flow chart showing the operation of the control device in the case where the set value parameter (2) is applied to another embodiment of the present invention.

Fig. 15A is a graph showing changes in the stroke S of the electromagnetic reciprocating pump driven by the control device according to the embodiment of the present invention when the power supply voltage is 100 V AC and the discharge pressure is 1.0 MPa.

Fig. 15B is a graph showing a change in the current I of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device according to the embodiment of the present invention when the power source voltage is 100 V AC and the discharge pressure is 1.0 MPa.

Fig. 15C is a graph showing changes in the applied voltage V of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device according to the embodiment of the present invention when the power supply voltage is 100 V AC and the discharge pressure is 1.0 MPa.

Fig. 15D is a graph showing changes in the applied voltage V of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device according to the embodiment of the present invention when the power supply voltage is 100 V AC and the discharge pressure is 1.0 MPa.

Fig. 15E is a graph showing changes in the applied voltage V of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device according to the embodiment of the present invention when the power supply voltage is 100 V AC and the discharge pressure is 1.0 MPa.

Figure 16A shows the power supply voltage is 200V AC and the discharge pressure In the case of 1.0 MPa, the stroke S of the electromagnetic reciprocating pump driven by the control device according to another embodiment of the present invention is changed.

Fig. 16B is a graph showing a change in the current I of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device according to another embodiment of the present invention when the power supply voltage is 200 V AC and the discharge pressure is 1.0 MPa.

Fig. 16C is a graph showing a change in the applied voltage V of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device according to another embodiment of the present invention when the power supply voltage is 200 V AC and the discharge pressure is 1.0 MPa.

Fig. 16D is a graph showing changes in the applied voltage V of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device according to another embodiment of the present invention when the power supply voltage is 200 V AC and the discharge pressure is 1.0 MPa.

Fig. 16E is a graph showing changes in the applied voltage V of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device according to another embodiment of the present invention when the power supply voltage is 200 V AC and the discharge pressure is 1.0 MPa.

Fig. 17A is a graph showing changes in the stroke S of the electromagnetic reciprocating pump driven by the control device according to another embodiment of the present invention when the power supply voltage is 200 V AC and the discharge pressure is 0.2 MPa.

Fig. 17B is a diagram showing changes in the current I of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device according to another embodiment of the present invention, when the power supply voltage is 200 V AC and the discharge pressure is 0.2 MPa. shape.

Fig. 17C is a graph showing changes in the applied voltage V of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device according to another embodiment of the present invention when the power supply voltage is 200 V AC and the discharge pressure is 0.2 MPa.

Fig. 17D is a graph showing changes in the applied voltage V of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device according to another embodiment of the present invention when the power supply voltage is 200 V AC and the discharge pressure is 0.2 MPa.

Fig. 17E is a graph showing changes in the applied voltage V of the electromagnetic coil of the electromagnetic reciprocating pump driven by the control device according to another embodiment of the present invention, when the power supply voltage is 200 V AC and the discharge pressure is 0.2 MPa.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the structure of the electromagnetic reciprocating pump 100 controlled by the control device 60 of the present embodiment will be described.

As shown in Fig. 1, the electromagnetic reciprocating pump 100 is composed of a pump unit 10 and a drive unit 20. The drive unit 20 includes a disk-shaped base portion 22 having a through hole 23 in the center, a base 26 protruding toward the periphery of the through hole 23 on one side of the base portion 22, and a peripheral edge fixed to the surface of the pedestal 26 so as to cover the surface. The Teflon film of the hole 23 ("Teflon" is a registered trademark, the same applies hereinafter) 31 (separator), the boss 32 fixed to the side of the through hole 23 in the center of the Teflon film 31, and Output shaft 47 enters through The through hole 23 is fixed to the direct-acting type electromagnetic tube 40 which is fixed to the other surface 27 of the base portion 22 by a bolt 29 inserted from the groove portion 28 on the opposite side. The output shaft 47 of the direct-acting electromagnetic tube 40 is connected to the boss 32. Further, an annular projecting portion 24 is provided in the vicinity of the outer periphery of the other side of the base portion 22, and the annular projecting portion 24 is fitted to the fitting recess portion formed in the base portion 17 of the pump portion 10. 18.

The pump unit 10 includes a disk-shaped base portion 17, a suction pipe 11a extending downward in the base portion 17, a discharge pipe 11b extending in the upward direction of the base portion 17, and a Teflon film 31 held thereon. The abutting surface 19 between the surface of the pedestal 26 of the driving portion 20, the concave portion 14 recessed from the surface of the opposing surface 19, the suction flow path 12 connecting the concave portion 14 and the suction pipe 11a, the connecting concave portion 14 and the discharge tube 11b The discharge flow path 13 , the suction side check valve 15 provided between the suction pipe 11 a and the suction flow path 12 , and the discharge side check valve 16 provided between the discharge pipe 11 b and the discharge flow path 13 .

The fitting recess 18 formed in the base portion 17 of the pump portion 10 is fitted to the protruding portion 24 formed on the base portion 22 of the driving portion 20, and penetrates the base portion 17 from the side opposite to the driving portion 20 of the base portion 17. A fixing screw (not shown) is locked into the base portion 22 of the driving portion 20, whereby the driving portion 20 and the pump portion 10 are combined, and the concave portion 14 of the pump portion 10 is disposed opposite to the Teflon film 31, and is ironed. A chamber 30 is formed between the fluorocarbon membranes 31.

The direct-acting type electromagnetic tube 40 includes a case 41, a hole portion 42 provided at a center portion of the case, and an electromagnetic coil 44 attached to the outer peripheral side of the hole portion 42, and is connected to the output shaft 47 and guided by the hole portion 42. The armature 45 moving in the direction of the axis returns to the opposite side of the Teflon film 31 from the armature 45 The spring 46 is fixed to the frame 50 on the opposite side of the housing 41 from the Teflon filter 31 by the nut 52, and is locked into the frame 50 to restrict the armature 45 from being opposite to the Teflon film 31. The moving stop portion 51.

The control device 60 includes a positive electrode side circuit 71 connected to the positive electrode side of the DC power source 70 such as a battery, and a negative electrode side circuit 72 connected to the negative electrode side of the DC power source 70. The negative electrode side circuit 72 has a switching element 62 such as an FET and a current sensor 64 connected in series from the negative electrode side. A connection circuit 75 for connecting the negative electrode side circuit 72 and the positive electrode side circuit 71 is disposed between the switching element 62 and the current sensor 64, and the connection circuit 75 is configured to direct current from the negative electrode side circuit 72 toward the positive electrode side circuit 71. The diode 63 is connected in a flowing manner. Further, the control device 60 includes an arithmetic unit 61 having a storage unit for storing a program and/or a control set value, and performing information processing and outputting a control signal; a start/stop button 66; and inputting a stroke number or the like. And the input/output unit 65 that inputs the numerical value is displayed. The switching element 62, the current sensor 64, the input/output unit 65, and the start/stop button 66 are respectively connected to the calculation circuit 61, and the switching element 62 is controlled by the control signal output from the calculation circuit 61. When the current is detected by the current sensor 64, the current flowing through the electromagnetic coil 44 is input to the calculation circuit 61, and the number of strokes input by the input/output unit 65 is stored in the memory unit inside the calculation circuit and displayed on the input. A display or the like of the output unit 65. Further, the positive side circuit 71 of the control device 60 is connected to the input circuit 73 of the electromagnetic coil 44 of the direct acting electromagnetic tube 40, and the negative side circuit 72 is connected to the output circuit 74 of the electromagnetic coil 44. Further, in the present embodiment, the current sensor 64 surrounds the periphery of the negative electrode side circuit 72, The current is detected by the electromagnetic induction generated by the current of the negative side circuit 72, but other forms of current sensors are also possible.

Next, the basic operation of the electromagnetic reciprocating pump 100 described with reference to Fig. 1 will be described with reference to Figs. 2A to 2C. The basic operation of the electromagnetic reciprocating pump 100 is repeated for every predetermined stroke period ΔTs shown in FIG. 2C: the switching element 62 is turned on at time t0 and the electromagnetic coil 44 is energized for a predetermined period ΔTon by electromagnetic The electromagnetic force (thrust) generated by the coil 44 moves the armature 45 toward the pump unit 10 side (moving forward), and the liquid entering the chamber 30 passes through the discharge flow path 13 and the discharge side check valve 16 and from the discharge pipe. 11b is discharged, and thereafter, the switching element 62 is turned off at time t3 to block the energization of the electromagnetic coil 44, thereby reducing the electromagnetic force (thrust) generated by the electromagnetic coil 44, and by the pressing force of the return spring 46. The armature 45 is moved (rearwardly moved) to the initial position and the volume of the chamber 30 is increased, and the fluid is sucked from the suction flow path 12 into the chamber 30 through the suction pipe 11a and the suction side check valve 15. That is, the energization and the interruption of the electromagnetic coil 44 are repeated for a predetermined stroke period ΔTs, and the armature 45 is moved to the rear after a predetermined stroke period ΔTs, and the fluid is sucked from the suction pipe 11a and discharged from the discharge pipe 11b. fluid.

The time variation of the voltage V applied to the electromagnetic coil 44, the current I flowing through the electromagnetic coil 44, and the stroke S of the armature 45 in the above basic operation will be described in detail. As shown in FIG. 2A, when the switching element 62 is turned on at time t0, a DC power supply 70 → a positive side circuit 71 → an input circuit 73 → an electromagnetic coil 44 → an output circuit 74 → a negative side circuit 72 → a DC power supply are formed. Circuit R1 of current flow of 70, as shown in Figure 2C The solid line 91 shows a DC power supply voltage V0 applied to the electromagnetic coil 44 at time t0. On the other hand, as indicated by a broken line 92 in FIG. 2C, the current I starts to flow through the electromagnetic coil 44 from time t0. Since the current I flowing into the electromagnetic coil 44 is accumulated as electric energy inside the electromagnetic coil 44, the current value does not rise immediately as the voltage rises, but rises slowly. Since the electromagnetic force (thrust) generated by the electromagnetic coil 44 is proportional to the magnitude of the current flowing through the electromagnetic coil 44 and the number of turns of the electromagnetic coil 44, the electromagnetic coil 44 is generated while the current I flowing through the electromagnetic coil 44 is small. The electromagnetic force is also small. Therefore, the thrust force for pushing the armature toward the pump portion 10 by the electromagnetic force of the electromagnetic coil 44 is also small, and the armature 45 is stagnated by the pressing force of the return spring 45 at the rear end and the stopper portion 51. Pick up position (initial position).

After a period of time, when the current I flowing through the electromagnetic coil 44 is a certain magnitude, the electromagnetic force (thrust) generated by the electromagnetic coil 44 is higher than the pressing force of the return spring 46, so that the armature 45 starts to face the pump portion. Move in the direction of 10 (moving forward). When the armature 45 moves in the direction of the pump unit 10, the output shaft 47 connected to the armature 45 and the boss 32 connected to the output shaft 47 are moved in the direction of the pump unit 10, and the Teflon film 31 is oriented. The recess 14 of the base portion 17 of the pump portion 10 is pushed out. When the current is continuously supplied, the electromagnetic force (thrust) for moving the armature 45 toward the pump unit 10 increases as the current flowing through the electromagnetic coil 44 increases, and the armature 45 moves toward the pump unit 10. As shown in Fig. 2C, the stroke S gradually increases as indicated by the one-point chain line 93. Further, when the stroke S is 100%, the end surface of the armature 45 on the pump portion 10 side abuts against the bottom surface 43 of the hole portion 42, and the movement of the armature 45 in the direction toward the pump portion 10 is stopped. When the stroke S is 100% At this time, the capacity of the chamber 30 formed between the concave portion 14 of the base portion 17 of the pump portion 10 and the Teflon film 31 (diaphragm) is reduced. Thereby, the fluid that has entered the chamber 30 first is discharged from the discharge pipe 11b to the outside.

Thereafter, until the switching element 62 is turned off at the time t3, the electromagnetic coil 44 is applied with the DC power supply voltage V0, and the current I is gradually increased. During this period, the end face of the armature 45 is maintained in a state of abutting against the bottom surface 43 of the hole portion 42 (stroke S = 100%). When the time t3 elapses for the predetermined period ΔTon, the switching element 62 is turned off, and the voltage applied to the electromagnetic coil 44 as indicated by the solid line 91 in FIG. 2C is zero. At this time, as indicated by a broken line 92 in Fig. 2C, the current flowing through the electromagnetic coil 44 reaches the maximum current Imax. After time t3, the electromagnetic coil 44 is not applied with a voltage from the DC power source, but due to the electric energy remaining in the electromagnetic coil 44, as shown in FIG. 2B, the current flows through the electromagnetic coil 44 → the output circuit 74 → the negative side circuit 72 → Since the circuit 75 is connected to the circuit 75 → the diode 63 → the input circuit 73, the current flowing through the electromagnetic coil 44 does not immediately become zero as indicated by the broken line 92 in Fig. 2C. This current gradually decreases from the maximum current Imax with the circuit resistance. Further, when the electric force which is generated by the current flowing through the electromagnetic coil 44 and which pushes the armature 45 toward the pump portion 10 side becomes the pressing force of the return spring 46 which urges the armature 45 toward the opposite side of the pump portion 10 When it is weak, the armature 45 is returned to the position (initial position) at which the rear end abuts against the stopper portion 51 by the return spring 46 (moving backward). When the armature 45 moves backward, the output shaft 47 and the boss 32 also return to their original positions. At this time, since the capacity of the chamber 30 between the concave portion 14 and the Teflon film 31 is increased, the fluid is passed through the suction pipe 11a and the suction side check valve 15 The suction flow path 12 is sucked into the chamber 30. And, this state is maintained until a predetermined stroke period ΔTs elapses. When the predetermined stroke period ΔTs has elapsed, the switching element 62 is again turned on, and the electromagnetic coil 44 is energized and the fluid is discharged.

Next, the operation of the electromagnetic reciprocating pump 100 by the control device 60 of the present embodiment will be described with reference to Figs. 3 to 10D. The calculation circuit 61 receives the number of strokes per minute of the pump from the input/output unit 65 in advance, and the value is stored in the memory unit of the calculation circuit 61. Further, the memory unit of the arithmetic circuit 61 stores in advance the set value parameter (1) shown in FIG. 8A and the set value parameter (2) shown in FIG. 8B. The set value parameter (1) is that the upper limit threshold is set to IH3 between the predetermined period ΔTon from time t0 to time t3, the lower limit threshold is set to IL3, and the set value parameter (2) is from time t0. The upper limit threshold is set to IH1 and the lower limit threshold is set to IL1 until time t1, and the upper limit threshold is set to IH2 and the lower limit threshold is set to IL2 from time t1 to time t2, from time t2 to time t3. , the upper limit threshold is set to IH3, and the lower limit threshold is set to IL3. That is, the set value parameter (2) is the one that switches the upper and lower thresholds as time passes. Here, as shown in FIGS. 2A to 2C and 9A to 9C, the timing t0 starts the application of the voltage to the electromagnetic coil 44, and the timing t3 completely stops the application of the voltage to the electromagnetic coil 44. The time is, and time t1, t2 is the time between time t0 and time t3. Further, the period between the time t0 and the time t3 is a time period in which a sufficient time is required for the stroke of the armature 45 to reach 100%, that is, "predetermined period ΔTon". "The predetermined period △Ton" is based on the size of the pump, The period determined by the capacity or the like is stored in advance in the memory unit inside the calculation circuit 61. Further, the "predetermined period ΔTon" is not limited to a fixed period, and may be changed, for example, according to a power source voltage, a number of strokes, or the like.

The solid lines a1, d1, and g1 in FIGS. 9A to 9C show that the electromagnetic coil 44 is continuously energized and driven from time t0 to time t3 as previously described with reference to FIGS. 2A to 2C. The stroke S of the direct-acting electromagnetic tube 40, the current I flowing through the electromagnetic coil 44, and the voltage V applied to the electromagnetic coil 44. The solid lines a1, d1, and g1 are the same as the basic operations of the electromagnetic reciprocating pump 100 described with reference to FIGS. 2A to 2C, and thus the description thereof will be omitted. In the following description, the same portions as those described with reference to FIGS. 2A to 2C are briefly described.

First, the control of the case where the power supply voltage is 100 V DC and the set value parameter (1) shown in FIG. 8A is applied, that is, the case where the following control is performed: at the timings in FIGS. 9A to 9C In the predetermined period ΔTon between t0 and the time t3, when the current flowing through the electromagnetic coil 44 detected by the current sensor 64 rises to the upper limit threshold IH3, the switching element 62 is turned off, and when the current is The switching element 62 is turned on when falling to the lower limit threshold IL3. In the 9A to 9C, the one-dot chain lines b1, e1, and h1 respectively show the stroke S in the above-described case, the current I flowing through the electromagnetic coil 44, and the voltage V applied to the electromagnetic coil 44.

When the start/stop button 66 shown in Fig. 1 is pressed, as shown in step S101 of Fig. 3, the arithmetic circuit 61 reads the upper limit threshold IH3 and the lower limit threshold IL3 in the set value parameter (1), and the predetermined period. ΔTon, the stroke period ΔTs (predetermined period) calculated from the number of strokes. Next, as shown in step S102 of FIG. 3, the arithmetic circuit 61 sets the switching element 62 to ON at the time t0 shown in FIG. 9C and starts counting the predetermined period ΔTon of the first signal, and starts counting the stroke period. ΔTs (predetermined period) time. As indicated by the one-point chain line h1 in Fig. 9C, the power supply voltage 100V is applied to the electromagnetic coil 44 at time t0, and as indicated by the one-point chain line e1 in Fig. 9B, the electromagnetic coil 44 starts to flow a current. As shown in step S103 of Fig. 3, the arithmetic circuit 61 judges whether or not the predetermined period ΔTon has elapsed, and performs the current control loop shown in step S104 shown in Fig. 3 in the case where the predetermined period ΔTon has not elapsed. deal with. The calculation circuit 61 performs a current control loop process to monitor whether or not a predetermined period ΔTon has elapsed.

The current control loop processing is repeated by the steps shown in steps S111 to S115 of FIG. As shown in step S111 of FIG. 3, when the calculation circuit 61 starts the current control loop processing, the current flowing through the electromagnetic coil 44 is detected by the current sensor 64. Next, as shown in step S112 of FIG. 3, the arithmetic circuit 61 compares the detected current value detected by the current sensor 64 with the upper limit threshold IH3. As shown by the one-point chain line e1 in FIG. 9B, after the instant t0, since the current is not yet large, the detected current value is smaller than the upper limit threshold IH3, so the calculation circuit 61 determines that the detected current value has not risen to the upper limit threshold IH3. (No (NO) is determined in step S112 of FIG. 3), and the process proceeds to step S115 of FIG. 3, and a signal (second signal) for maintaining the switching element 62 in an ON state is output, and the process returns to step S112 of FIG. The current flowing through the electromagnetic coil 44 is monitored.

As indicated by the one-point chain line e1 in Fig. 9B, the current flowing through the electromagnetic coil 44 gradually rises with the passage of time. Further, at time t5 shown in Fig. 9A, when the current flowing through the electromagnetic coil 44 reaches Is, the armature 45 is pushed out toward the pump portion 10 by the current flowing through the electromagnetic coil 44. The thrust force is larger than the pressing force formed by the return spring 46 in the opposite direction to the pump portion 10, so that the armature 45 starts to move toward the pump portion 10 (moving forward). Thereby, as indicated by the one-point chain line b1 in Fig. 9A, the stroke S of the armature 45 gradually becomes larger from zero. On the other hand, as shown by the one-point chain line e1 in FIG. 9B, since the current flowing through the electromagnetic coil 44 continues to rise and does not rise to the upper limit threshold IH3, the calculation circuit 61 repeatedly executes the step S112 shown in FIG. Step S115. In the meantime, the arithmetic circuit 61 outputs a signal (second signal) that holds the switching element 62 in an on state. Further, as shown by the one-point chain line b1 in Fig. 9A, when the stroke S of the armature 45 reaches 100% at the time t6, the position of the armature 45 is maintained at the position of 100% of the stroke.

At time t15 of FIG. 9B, as indicated by the one-point chain line e1, when the current flowing through the electromagnetic coil 44 detected by the current sensor 64 reaches the upper limit threshold IH3 (detection current value ≧IH3), the calculation circuit 61 In step S112 shown in FIG. 3, it is determined that the detected current value has risen to the upper limit threshold value IH3, and proceeds to step S113 in FIG. 3, and a signal (second signal) for turning off the switching element 62 is output. Since the switching element 62 is turned off when the signal is input to the switching element 62, the voltage applied to the electromagnetic coil 44 becomes zero at the time t15 from the initial 100V as indicated by the one-point chain line h1 in Fig. 9C. As explained with reference to FIG. 2B, even if the switching element 62 is turned off, The electric current stored in the electromagnetic coil 44 is also passed through the electromagnetic coil 44 → the output circuit 74 → the connection circuit 75 → the diode 63 → the circuit R2 of the input circuit 73, so that the current continues to flow through the electromagnetic coil 44. The current flowing through the aforementioned circuit R2 gradually decreases with the resistance of the circuit R2.

The arithmetic circuit 61 outputs a signal for turning off the switching element 62 in step S113 shown in FIG. 3, and then proceeds to step S114 shown in FIG. 3 to determine the flow detected by the current sensor 64. Whether the current value of the electromagnetic coil 44 is lowered to the lower limit threshold IL3. As shown by the one-point chain line e1 in Fig. 9B, after the instant of time t15, the detected current value is slightly lower than the upper limit threshold IH3, and has not been lowered to the lower limit threshold IL3. Therefore, the arithmetic circuit 61 determines in step S114 of FIG. 3 that the detected current value has not decreased to the lower limit threshold value IL3, and returns to step S113 of FIG. 3 and outputs a signal (second signal) in which the switching element 62 is kept turned off. ). Thereafter, the arithmetic circuit 61 repeatedly executes steps S114 and S113 shown in FIG. In the meantime, the arithmetic circuit 61 outputs a signal (second signal) that holds the switching element 62 in the off state.

As shown by the one-point chain line e1 in FIG. 9B, at time t17, when the detected current value falls to the lower limit threshold value IL3 (detection current value ≦IL3), the arithmetic circuit 61 judges "YES" in step S114 of FIG. Then, the process proceeds to step S115 shown in FIG. 3, and a signal (second signal) for turning on the switching element 62 is output, and the process returns to step S112 shown in FIG. 3 to determine the current flowing through the electromagnetic coil 44. Whether the value rises to the upper threshold IH3. As shown by the one-point chain line h1 in FIG. 9C, the electric power applied to the electromagnetic coil 44 at the time t17 at which the switching element 62 is turned on is turned on. The pressure system changes from zero to 100V. Then, the current flowing through the electromagnetic coil 44 by the circuit R1 described with reference to Fig. 2 gradually increases.

When the calculation circuit 61 returns to step S112 of FIG. 3, as in the previous description, steps S112 and S115 shown in FIG. 3 are repeatedly executed until the current flowing through the electromagnetic coil 44 rises to the upper limit threshold IH3, and the output will be output. When the switching element 62 is turned on (second signal), when the current flowing through the electromagnetic coil 44 rises to the upper limit threshold IH3, the process proceeds to step S113 in FIG. 3, and the same as the above description, the execution of FIG. 3 is repeated. Steps S114 and S113 are until the current flowing through the electromagnetic coil 44 falls to the lower limit threshold value IL3, and a signal (second signal) for turning off the switching element 62 is output.

As described above, the arithmetic circuit 61 repeats the flow to the electromagnetic coil between the time t0 at which the start of the electromagnetic reciprocating pump 100 is started by pressing the start/stop button 66 and the time t3 when the "predetermined period ΔTon" is completed. When the detected current value of 44 rises to the upper limit threshold IH3, the switching element 62 is turned off (times t15, t18), and when the detected current value falls to the lower limit threshold IL3, the switching element 62 is turned on (times t17, t20). The current value flowing through the electromagnetic coil 44 is controlled between the upper limit threshold IH3 and the lower limit threshold IL3. The signal for causing the switching element 62 to be turned on/off during the predetermined period ΔTon constitutes the second signal.

After time t6, as indicated by the one-point chain line e1 in Fig. 9B, the current flowing through the electromagnetic coil 44 is formed such that the thrust of the electromagnetic coil 44 in the direction toward the pump portion 10 of the armature 45 is substantially equal to the return. The current value of the pressing force formed by the spring 46 toward the opposite side of the pump portion 10 Is is also a large current, so after time t6, as indicated by the one-point chain line b1 in Fig. 9A, the stroke S of the armature 45 is maintained at 100%.

When it is time t3, the arithmetic circuit 61 judges that the "predetermined period ΔTon" has elapsed in step S103 of Fig. 3, and ends the current control loop processing shown in step S104 of Fig. 3, and proceeds to the In step S105 shown in Fig. 3, a signal for turning off the switching element 62 is output. This signal sets the switching element 62 to the first signal that is turned off. Since the switching element 62 is turned off when the signal is input to the switching element 62, the voltage applied to the electromagnetic coil 44 at time t3 is changed from the instantaneous 100V to zero as indicated by the one-point chain line h1 in Fig. 9C. As described with reference to FIG. 2B, even if the switching element 62 is turned off, the electric power stored in the electromagnetic coil 44 is received, and the current flows through the electromagnetic coil 44 → the output circuit 74 → the connection circuit 75 → the diode 63 → the input In the circuit R2 of the circuit 73, the current indicated by the one-point chain line e1 after the time t3 in Fig. 9B continues to flow through the electromagnetic coil 44. The current flowing through the aforementioned circuit R2 gradually decreases with the resistance of the circuit R2. Further, the arithmetic circuit 61 outputs a first signal for turning off the switching element 62 at time t3, and simultaneously restores the count of the "predetermined period ΔTon" to zero of the initial value.

The arithmetic circuit 61 outputs a signal for turning off the switching element 62 in step S105 shown in FIG. 3, and then proceeds to step S106 of FIG. 3 to determine whether or not a predetermined period ΔTs has elapsed (in FIG. 2C). The predetermined stroke period ΔTs) is shown. Until the predetermined period ΔTs elapses, the arithmetic circuit 61 continues to turn the switching element 62 off. Between the two, as shown by the point chain e1 in Fig. 9B, the electromagnetic coil is circulated. The current of 44 is gradually lowered, and the thrust applied to the direction of the pump portion 10 of the armature 45 by the electromagnetic coil 44 is also lowered. Further, as previously described with reference to FIGS. 2A to 2C, the thrust of the electromagnetic coil 44 in the direction toward the pump portion 10 of the armature 45 is pushed by the return spring 46 in the opposite direction to the pump portion 10. When the pressure is still small, the armature 45 is moved in the opposite direction of the pump portion 10 by the urging force of the return spring 46 (moving backward), and the rear end of the armature 45 is returned to the initial position of the stopper portion 51. When it is determined in step S106 of FIG. 3 that the predetermined period (predetermined stroke period ΔTs) has elapsed, the arithmetic circuit 61 proceeds to step S107 of FIG. 3 to determine whether or not the start stop button 66 is pressed, and if there is no stop command. In this case, the count of the "predetermined period ΔTs" is reset to zero and returns to step S101, and the upper limit threshold IH3 and the lower limit threshold IL3 in the set value parameter (1) and the predetermined period ΔTon are calculated again, and the number of strokes is calculated. The stroke period ΔTs (predetermined period) outputs a first signal for turning on the switching element 62 as shown in step S102 of FIG. 3, and counts the "predetermined period ΔTon" and the "predetermined period ΔTs". Initially, the steps of steps S103 to S106 shown in Fig. 3 are repeatedly executed. Further, in step S107 of Fig. 3, when it is determined that the start/stop button is pressed and a stop command is input, the operation is stopped.

In the control device 60 of the embodiment described above, since the magnitude of the current flowing through the electromagnetic coil 44 after time t15 shown in FIG. 9B is maintained between the upper limit threshold IH3 and the lower limit threshold IL3, FIG. 9B When the electromagnetic coil 44 is continuously energized by 100 V between the time t0 indicated by the solid line d1 and the "predetermined period ΔTon" from the time t3, it is possible to suppress the current value from increasing to more than necessary. this In addition, since the voltage applied to the electromagnetic coil 44 is turned on/off by the switching element 62, the total time when the voltage of the DC power source is applied to the electromagnetic coil 44 is also continuously energized by the electromagnetic coil 44 by 100V. The voltage application time in the case is also short. In this case, it is understood that the electric power applied to the electromagnetic coil 44 in the "predetermined period ΔTon" is smaller than the electric power applied to the electromagnetic coil 44 when the electric current is continuously supplied with 100 V. That is, the control device 60 of the present embodiment can reduce the power consumption compared to the control method in which the electromagnetic coil 44 is continuously energized.

Further, in the case where the current of the electromagnetic coil 44 is controlled by the control device 60 of the present embodiment, the maximum current value of the "predetermined period ΔTon" (the current value at the time t3 of the one-point chain line e1 shown in Fig. 9B) is The maximum current value (the current value at the time t3 of the solid line d1 shown in FIG. 9B) in the case where the electromagnetic coil 44 is continuously energized is smaller than the "predetermined period ΔTon" in the conventional technique. Since the temperature rise of the electromagnetic coil 44 is determined by the maximum value of the current flowing through the electromagnetic coil 44, the control device 60 of the present embodiment can control the electromagnetic coil 44 as compared with the case where the electromagnetic coil 44 is continuously energized and controlled. The temperature rise of the direct-acting electromagnetic tube 40 is suppressed to be low.

Next, with reference to FIGS. 4 to 9C, the control of the case where the power supply voltage is 100 V DC and the set value parameter (2) shown in FIG. 8B is applied will be described, that is, the case where the following control is performed: Among the predetermined periods ΔTon from the time t0 to the time t3 from the time t0 to the 9Cth, the current section is used in the first section (the first section time ΔT1) from the time t0 to the time t1. 64 detected circulation in electricity When the current of the magnetic coil 44 rises to the first upper limit threshold IH1, the switching element 62 is turned off, and when the detected current value is lowered to the first lower limit threshold IL1, the switching element 62 is turned on; when the time t1 is exceeded In the second section (the second section time ΔT2) of the time t2, when the detected current value rises to the second upper limit threshold IH2, the switching element 62 is turned off, and when the detected current value falls to the second lower limit threshold IL2 In the third section (the third section time ΔT3) that exceeds the time t2 to the time t3, the switching element 62 is set when the detected current value rises to the third upper threshold value IH3. To be turned off, and when the detected current value is lowered to the third lower limit threshold IL3, the switching element 62 is set to be turned on. Wherein, IH3>IH2>IH1, and IL3>IL2>IL1, and ΔT1+ΔT2+ΔT3=ΔTon. That is, the control system using the set value parameter (2) controls the upper limit threshold and the lower limit threshold in three stages (gradually increasing) as time elapses from time t0. The broken lines c1, f1, and j1 in FIGS. 9A to 9C show the stroke S at this time, the current I flowing through the electromagnetic coil 44, and the voltage applied to the electromagnetic coil 44, respectively. In addition, the same control as that for the case of using the previously set value parameter (1) is briefly explained.

As in the case of using the set value parameter (1) described earlier, when the start/stop button 66 shown in Fig. 1 is pressed, the arithmetic circuit 61 reads the set value as shown in step S201 of Fig. 4. The first upper limit threshold IH1 and the first lower limit threshold IL1, the first interval time ΔT1, and the stroke period ΔTs (predetermined period) calculated from the number of strokes in the parameter (2) and the predetermined period Δ Ton. Then, as shown in Figure 4 As shown in step S202, the arithmetic circuit 61 sets the switching element 62 to ON at the time t0 shown in FIG. 9C, starts the counting of the predetermined period ΔTon of the first signal, counts the first interval time ΔT1, and the slave stroke. Count of the calculated stroke period ΔTs (predetermined period).

As indicated by a broken line j1 in Fig. 9C, the electromagnetic coil 44 is applied with a power supply voltage of 100 V at time t0, and as indicated by a broken line f1 in Fig. 9B, the electromagnetic coil 44 starts to flow a current. As shown in step S202 of FIG. 4, the calculation circuit 61 determines whether or not the first interval time ΔT1 has elapsed, and the first interval time ΔT1 has not been shifted, and the current shown in step S220 shown in FIG. 4 is executed. Control loop processing. The calculation circuit 61 performs a current control loop process to monitor whether or not the first section time ΔT1 has elapsed, and the calculation circuit 61 also monitors whether or not the predetermined time ΔTon has elapsed.

Fig. 5 is a view showing the details of the current control loop processing in step S220 of Fig. 4. The current control loop processing in step S220 is the same as the current control loop processing described in steps S111 to S115 of Fig. 3 except that the threshold values of the upper limit and the lower limit are the first upper limit threshold IH1 and the first lower limit threshold IL1. When the calculation circuit 61 starts the current control loop processing, as shown in step S221 of FIG. 5, the current flowing through the electromagnetic coil 44 is detected by the current sensor 64. Next, as shown in step S222 of FIG. 5, the arithmetic circuit 61 compares the detected current value detected by the current sensor 64 with the first upper limit threshold IH1. As shown by the broken line f1 in Fig. 9B, after the time t0, since the current is not large enough, the detected current value is smaller than the first upper limit threshold IH1, the calculation circuit 61 determines that the detected current value has not risen to the first upper limit. Threshold value IH1 (step S222 of Fig. 5 judges no, (NO)), the process proceeds to step S225 of Fig. 5, and a signal (second signal) for turning on the switching element 62 is output, and the process returns to step S222 of Fig. 5 to monitor the current flowing through the electromagnetic coil 44.

At time t5 shown in Fig. 9A, when the current flowing through the electromagnetic coil 44 reaches Is, the thrust which pushes the armature 45 toward the pump portion 10 due to the current flowing through the electromagnetic coil 44 is compared. Since the pressing force in the opposite direction to the pump portion 10 formed by the return spring 46 is also large, the armature 45 starts to move in the direction toward the pump portion 10 (moving forward). Thereby, as indicated by a broken line c1 in Fig. 9A, the stroke S of the armature 45 gradually becomes larger from zero.

As shown in FIG. 9B, since the first upper limit threshold value IH1 is substantially equal to the current value Is for causing the armature 45 to start moving forward, it flows to the electromagnetic coil 44 at time t5 as indicated by a broken line f1 in FIG. 9B. The current system rises to the first upper limit threshold IH1 (detection current value ≧IH1). Therefore, the calculation circuit 61 determines that the detected current value has risen to the first upper limit threshold value IH1 at time t5, and proceeds to step S223 of Fig. 5 to output a signal for turning off the switching element 62. Since the switching element 62 is turned off when the signal is input to the switching element 62, the voltage applied to the electromagnetic coil 44 at time t5 becomes zero from the initial 100V as indicated by a broken line j1 in Fig. 9C. As described above, even if the switching element 62 is turned off, the electric power stored in the electromagnetic coil 44 is supplied to the circuit R2 shown in FIG. 2B, so that the current continues to flow through the electromagnetic coil 44. The current flowing through the circuit R2 gradually decreases with the resistance of the circuit R2. When the arithmetic circuit 61 outputs a signal for turning off the switching element 62 in step S223 shown in FIG. 5, Proceeding to step S224 of Fig. 5, it is judged whether or not the current value detected by the current sensor 64 flowing through the electromagnetic coil 44 is lowered to the first lower limit threshold IL1.

As indicated by the broken line f1 in Fig. 9B, the current flowing through the electromagnetic coil 44 after the time t5 has not been lowered to the first lower limit threshold IL1. Therefore, the arithmetic circuit 61 determines in step S223 of FIG. 5 that the detected current value has not decreased to the first lower limit threshold IL1, and returns to step S223 of FIG. 5 and outputs a signal for turning off the switching element 62 (second signal). Thereafter, the arithmetic circuit 61 repeatedly executes steps S224 and S223 shown in FIG. In the meantime, the arithmetic circuit 61 outputs a signal (second signal) that turns off the switching element 62.

As shown by the broken line f1 in FIG. 9B, when the detected current value flowing through the electromagnetic coil 44 at time t11 is lowered to the first lower limit threshold IL1 (detected current value ≦IL1), the arithmetic circuit 61 is shown in FIG. In step S224, it is judged as "YES", and the process proceeds to step S225 of Fig. 5, and a signal (second signal) for turning on the switching element 62 is output, and the process returns to step S222 shown in Fig. 5 to judge the flow. Whether the current value current value of the electromagnetic coil 44 rises to the first upper limit threshold value IH1. When the switching element 62 is turned on at time t11, the electromagnetic coil 44 is applied with a DC voltage of 100 V as indicated by a broken line j1 in Fig. 9C, and the detection current flowing through the electromagnetic coil 44 is indicated by a broken line f1 in Fig. 9B. The value system is gradually increasing.

After returning to step S222 of FIG. 5, the arithmetic circuit 61 repeats the steps S222 and S225 shown in FIG. 5 until the current flowing through the electromagnetic coil 44 rises to the first upper limit as described above. When the threshold value IH1 is reached, a signal (second signal) for turning on the switching element 62 is output, and when the current flowing through the electromagnetic coil 44 rises to the first upper limit threshold value IH1, the process proceeds to step S223 of FIG. 5, which is described above. Similarly, steps S224 and S223 shown in FIG. 5 are repeatedly executed until the current flowing through the electromagnetic coil 44 is lowered to the first lower limit threshold value IL1, and a signal (second signal) for turning off the switching element 62 is output.

As indicated by the broken line f1 in FIG. 9B, the current flowing through the electromagnetic coil 44 is maintained at the first upper limit threshold IH1 ≒Is between the time t5 and the time t1 (the current value Is means the armature 45 of the electromagnetic coil 44). The thrust pushed out toward the pump unit 10 side is larger than the thrust value formed by the return spring 46 toward the opposite side of the pump unit 10 and the first lower limit threshold IL1. Therefore, the electromagnetic coil 44 directs the armature 45. The thrust force that is pushed out by the pump unit 10 is substantially the same as the thrust force in the opposite direction to the pump unit 10 by the return spring 46. Therefore, the stroke of the armature 45 between time t5 and time t1 is approximately zero.

At time t1 shown in FIGS. 9A to 9C, the arithmetic circuit 61 determines in step S203 of FIG. 4 that the first interval time ΔT1 has elapsed, stops the current control loop process shown in step S220, and proceeds to In step S204 shown in FIG. 4, the second upper limit threshold IH2 and the second lower limit threshold IL2 and the second interval time ΔT2 belonging to the parameter of the second section in the set value parameter (2) are read. Then, the calculation circuit 61 starts the counting of the second interval time ΔT2, and as shown in step S205 of FIG. 4, it is determined whether or not the second interval time ΔT2 has elapsed, and it is determined that the second interval time ΔT2 has not elapsed. Go to step S230 of FIG. 4 and perform current control loop deal with. The calculation circuit 61 executes between the current control loop processes in step S230 of Fig. 4, monitors whether or not the second interval time ΔT2 has elapsed, and also monitors whether or not the predetermined time ΔTon has elapsed.

Fig. 6 is a view showing details of the current control loop processing in step S230 of Fig. 4. The current control loop processing in step S230 is the same as the current control loop processing described in steps S221 to S225 of Fig. 5 except that the threshold values of the upper limit and the lower limit are the second upper limit threshold IH2 and the second lower limit threshold IIL2. The calculation circuit 61 repeats the steps S232 and S235 shown in FIG. 6 until the current flowing through the electromagnetic coil 44 rises to the second upper limit threshold IH2, and the output turns the switching element 62 into conduction. When the signal (second signal) rises to the second upper limit threshold IH2, the process proceeds to step S233 of FIG. 6, and steps S234 and S233 shown in FIG. 6 are repeatedly executed until the electromagnetic coil 44 flows. The current is reduced to the second lower limit threshold IL2, and a signal (second signal) that turns off the switching element 62 is output. As described above, the arithmetic circuit 61 controls the magnitude of the current flowing through the electromagnetic coil 44 between the second upper limit threshold IH2 and the second lower limit threshold IL2 between the time t1 and the second interval time ΔT2 at the time t2. .

The second upper limit threshold value IH2 and the second lower limit threshold value IL2 form a thrust force that pushes the armature 45 of the electromagnetic coil 44 toward the pump unit 10 side, and is larger than the pressing force formed by the return spring 46 toward the opposite side of the pump unit 10. Since the current value Is is still large, the second section armature 45 after the time t1 moves in the direction of the pump unit 10 by the thrust generated by the electromagnetic coil 44 (moves forward). However, the current flowing through the electromagnetic coil 44 is more electric. The current when the magnetic coil 44 is continuously supplied with a direct current of 100 V (shown by the solid line d1 in FIG. 9B) or the current when the set value parameter (1) is used (indicated by the one-point chain line e1 in FIG. 9B) small. Therefore, the movement of the armature 45 (forward movement) is slow, and as indicated by a broken line c1 in Fig. 9A, the stroke S of the armature 45 is 40% at the time t2 at the end of the second section.

When the calculation circuit 61 is at time t2, it is determined in step S205 of Fig. 4 whether or not the second interval time ΔT2 has elapsed, and the current control loop process shown in step S230 shown in Fig. 4 is stopped and proceeds to the In step S206 shown in FIG. 4, the third upper limit threshold IH3, the third lower limit threshold IL3, and the third interval time ΔT3 belonging to the parameter of the third section in the set value parameter (2) are read. Next, the calculation circuit 61 starts the counting of the third interval time ΔT3, and as shown in step S207 of FIG. 4, it is determined whether or not the third interval time ΔT3 has elapsed, and it is determined that the third interval time ΔT3 has not elapsed, and proceeds to Step S240 of Fig. 4, and the current control loop processing is executed. The calculation circuit 61 performs a flow between the current control loops in step S240 of Fig. 4, monitors whether or not the third section time ΔT3 has elapsed, and monitors whether or not the predetermined time ΔTon has elapsed.

Fig. 7 shows the details of the current control loop processing in step S240 of Fig. 4. The current control loop processing in step S240 is the same as the current control loop processing described in steps S231 to S235 of FIG. 6 except that the threshold values of the upper limit and the lower limit are the third upper limit threshold IH3 and the third lower limit threshold IIL3. . The calculation circuit 61 repeats the steps S242 and S245 shown in FIG. 7 until the current flowing through the electromagnetic coil 44 rises to the third upper limit threshold IH3, and outputs the same as described above. When the switching element 62 is turned on (second signal), the current flowing through the electromagnetic coil 44 rises to the third upper limit threshold IH3, and the process proceeds to step S243 of FIG. 7, and the step S244 shown in FIG. 7 is repeatedly executed. S243 until the current flowing through the electromagnetic coil 44 falls to the third lower limit threshold IL3, and a signal (second signal) for turning off the switching element 62 is output. As described above, the calculation circuit 61 controls the magnitude of the current flowing through the electromagnetic coil 44 between the third upper limit threshold IH3 and the third lower limit threshold IL3 between the time t2 and the third interval time ΔT3 at the time t3. .

Since the third upper limit threshold IH3 and the third lower limit threshold IL3 are each larger than the second upper limit threshold IH2 and the second lower limit threshold IL2 between the time points t1 and t2 (the second interval), the armature 45 of the electromagnetic coil 44 is directed toward the pump. The thrust of the portion 10 side is also larger than the second interval between the time t1 and the time t2. Therefore, as shown by the broken line c1 in Fig. 9A, the movement of the armature 45 in the third section after the time t2 (moving forward) is faster, and at the time t7, the stroke S is 90%. When the stroke S is increased, the overlap between the armature 45 and the moving direction of the electromagnetic coil 44 is increased, and even if the current flowing through the electromagnetic coil 44 is not increased, the thrust of the armature 45 toward the pump portion 10 is increased. By the increase of the thrust, after the time t7, the stroke S of the armature 45 rapidly becomes large, and the stroke S reaches 100% at the instant t7, and thereafter the stroke S is maintained at 100%.

The signals t5, t11, t12, t13, t14, t15, t16, t19, and t21 described above are used to turn on/off the switching element 62 to constitute the second signal.

And, at the time t3 shown in Figs. 9A to 9C In the case of step S207 shown in Fig. 4, the calculation circuit 61 determines that the third control interval ΔT3 has elapsed and stops the current control loop processing in step S240 of Fig. 4 . Since the predetermined period ΔTon=ΔT1+ΔT2+ΔT3, the arithmetic circuit 61 determines that the "predetermined period ΔTon" has elapsed when the third interval time ΔT3 has elapsed, as shown in step S208 of Fig. 4, The output sets the switching element 62 to a signal that is off. This signal sets the switching element 62 to the first signal that is turned off. Since the switching element 62 is turned off when the signal is input to the switching element 62, the voltage applied to the electromagnetic coil 44 at time t3 is formed to be zero by the instantaneous 100V as indicated by the broken line j1 in Fig. 9C. As described with reference to FIG. 2B, even if the switching element 62 is turned off, the electric power stored in the electromagnetic coil 44 is supplied to the circuit R2. Therefore, as shown by the broken line f1 at time t3 of FIG. The electromagnetic coil 44 continues to flow. The current flowing through the circuit R2 gradually decreases with the resistance of the circuit R2. Further, the arithmetic circuit 61 outputs the first signal of the switching element 62 to be turned off at time t3, and restores the count of the fixed period ΔTon" to zero of the initial value.

The calculation circuit 61 is the same as the above description. In step S208 shown in FIG. 4, after the signal for turning off the switching element 62 is output, the process proceeds to step S209 of FIG. 4, and it is judged whether or not the predetermined period has elapsed ( The predetermined stroke period ΔTs) shown in Fig. 2C. The calculation circuit 61 continues the state in which the switching element 62 is turned off until a predetermined period ΔTs elapses. When the calculation circuit 61 determines that the predetermined period (predetermined stroke period ΔTs) has elapsed, the process proceeds to steps S209 to S210 of FIG. 4, and it is determined whether the start/stop button 66 is pressed, when there is no stop command. In the case, the count of "predetermined period ΔTs" is reset to zero and returns to step S201, and steps S201 to S210 shown in Fig. 4 are repeated. Then, in step S210 of Fig. 4, it is judged that the start/stop button is pressed, and when the stop command is input, the operation is stopped.

In the control using the set value parameter (2) described above, the upper limit threshold and the lower limit threshold are gradually increased as time elapses, and the "predetermined period ΔTon" is satisfied (predetermined period ΔTon = ΔT1 + Δ) Since the stroke S reaches 100% before the end of T2+ΔT3), the current flowing through the electromagnetic coil 44 can be suppressed to be lower than that in the case of using the set value parameter (1), the power consumption can be further reduced, and the power can be reduced. The temperature rise of the electromagnetic coil 44 is suppressed to be lower.

Next, an operation in the case where the electromagnetic reciprocating pump 100 and the control device 60 described with reference to FIGS. 1 to 8B are connected to a DC power supply of 200 V will be described. The same operations as those previously described with reference to FIGS. 1 to 9C will be briefly described.

First, for the control of converting a DC voltage of 200 V into 100 V by PWM control and supplying it to the electromagnetic coil 44 (by the control of the prior art), the set value parameter is used for the control device 60 of the present embodiment. The control of the case of (1) and the control of the case where the control device 60 of the present embodiment uses the set value parameter (2) will be described.

The PWM control is performed between the time t0 and the time t3 in the 10D picture, that is, between the "predetermined period ΔTon", for example, the switching element 62 is set to have a high frequency operation ratio of 50% in a size of 1 to 2 kHz. Conduction /OFF, the 200V value stream voltage supplied from the DC power source is converted into a DC voltage of an average voltage of 100V and supplied to the electromagnetic coil 44. Therefore, the voltage waveform actually supplied to the electromagnetic coil 44 is a waveform in which the applied voltage is interrupted between 0.5 msec and after 0.5 msec as indicated by a solid line g2 in FIG. 10D. That is, the switching element 62 is turned on/off approximately 100 times between time t0 and time t3. The central value of the current flowing through the electromagnetic coil 44 rises rapidly from the time t0 as indicated by the time line d2 in Fig. 10B. Further, the waveform of the current forms a waveform in which the upper crest is higher than the conventional central value and the higher chopping is performed every time (in addition, only the change in the central value is displayed between the times t0 and t5, and the chopping is omitted). This chopping portion causes only a loss, and actually forms a current having a central value of the thrust that pushes the armature 45 toward the pump unit 10 side. In the manner described above, the solid line d2 indicating the central value of the current flowing through the electromagnetic coil 44 is at the time t'11 until the current value Is at which the movement of the armature 45 starts, and continues to rise thereafter. The stroke S of the armature 45 shown by the solid line a2 in Fig. 10A continues to increase after the time t'11, and reaches 100% between the time t1 and the time t2.

Next, a case where the setting value parameter (1) is used in the control device 60 of the present embodiment will be described. Unlike the case where the DC power supply of 100 V is used as described above, the voltage applied to the electromagnetic coil 44 is increased from 100 V to 200 V, so that the rise of the current flowing through the electromagnetic coil 44 becomes faster, so that the switching element 62 is turned on. / The number of shutdowns is increased compared to the case of 100V. As shown by the one-point chain line e1 in Fig. 9B, the case of 100V is between time t0 and t3, and the second switching element 62 of t15 and t18 is set. In order to turn off, the second switching element 62 of t17 and t20 is turned on. On the other hand, in the case of 200 V, as shown by the one-point chain line e2 in Fig. 10B and the one-point chain line h2 in the 10Cth figure, the control device 60 is at the time t'13, t' between the time t0 and the time t3. 16. The switching element 62 is turned off five times at t'19, t'21, and t'22, and the switching element is turned on at times t'14, t'18, t'20, t2, and t'23. 62 is set to be on. That is, in the case of 200 V, the switching element 62 is turned on/off in a manner of 2 times to 3 times as many as 100V. However, the number of ON/OFF times of the switching element 62 is approximately 1/20 of the number of switchings in the case of performing PWM control.

As shown by the one-point chain line e2 in FIG. 10B, since the current flowing through the electromagnetic coil 44 is rapidly increased by applying a direct current 200V to the electromagnetic coil 44, the point chain is as shown in FIG. 10A. As shown by b2, the rise of the stroke S of the armature 45 is slightly earlier than the case of 100V. After the time t'13, since the current flowing through the electromagnetic coil 44 is held between the upper limit threshold IH3 and the lower limit threshold IL3 as indicated by the one-point chain line e2 in FIG. 10B, as shown by the one-point chain line b2 in FIG. 10A The moving speed of the armature 45 is moderate, that is, the speed at which the stroke S rises is gentle, and as in the case of 100 V, the stroke S is up to 100% near the time t6. Therefore, the rise of the stroke S is slightly faster than the case of 100 V, but the change of the stroke S is substantially the same as the case of 100 V.

The case where the control device 60 of the present embodiment uses the set value parameter (2) is also the same as the case where the set value parameter (1) is used as described above, as shown by the broken line j2 in Fig. 10C, and the case where the DC power source is 100V. The number of times the switching element 62 is turned on/off is increased. but, In the case of using the set value parameter (2), in the first section between time t0 and time t1, as indicated by a broken line f2 in FIG. 10B, the current flowing through the electromagnetic coil 44 is maintained at the first upper limit threshold IH1. Between the ≒Is and the first lower limit threshold IL1, the armature 45 hardly moves between the two, and the current flowing through the electromagnetic coil 44 in the second interval between the time t1 and the time t2 remains the same as in the case of 100V. Between the second upper limit threshold IH2 and the second lower limit threshold IL2, the third interval between the time t2 and the time t3 is also held between the third upper limit threshold IH3 and the third lower limit threshold IL3 as in the case of 100V. Therefore, the time change of the stroke S of the armature 45 is substantially the same as that of 100 V (see the broken line c1 in FIG. 9A and the broken line c2 in the 10A diagram), and belongs to the last time t3 in the "predetermined period ΔTon". At the moment before the moment t7 reaches 100%.

As described above, the case where the control is performed using the set value parameter (1) or the case where the control is performed using the set value parameter (2) is in the control device 60 of the present embodiment, except that the reference to FIG. 9A is previously described. In addition to the effects described in FIG. 9C, the effect of controlling the current value or the current waveform flowing through the electromagnetic coil 44 to substantially the same shape can be achieved even if the voltage of the DC power source is 100 V or 200 V. Different power sources are affected by the performance of the electromagnetic reciprocating pump 100. Further, when the voltage of the DC power source is 200 V, the control device 60 of the present embodiment performs control by using the set value parameter (1) or by using the set value parameter (2). There is almost no chopping that causes loss or heat in the case of using conventional PWM control, so that it is possible to reduce the loss and reduce the power consumption. Can respond to different power supply voltage effects. In the case where the control device 60 of the present embodiment uses the set value parameter (1), the maximum value of the current flowing through the electromagnetic coil 44 (the value at the time t3 of the one-point chain line e2 in FIG. 10B), and In the case where the control device 60 of the present embodiment uses the set value parameter (2), the maximum value of the current flowing through the electromagnetic coil 44 (the value at the time t3 at the time of the broken line f2 in Fig. 10B) is a case in which each is controlled by the PWM. The maximum value of the current flowing through the electromagnetic coil 44 (the value at the time t3 of the solid line d2 in FIG. 10B) is small, and the control device 60 of the present embodiment can suppress the electromagnetic coil 44 of the electromagnetic reciprocating pump 100 or The temperature of the direct-acting electromagnetic tube 40 rises. Thereby, the electronic component is not exposed to high temperatures, and the durability of the machine can be extended.

Next, a control device 160 according to another embodiment of the present invention will be described with reference to Figs. 11 to 17E. The same portions as those of the control device 60 described with reference to the previous FIGS. 1 to 10D are denoted by the same reference numerals and will not be described.

As shown in Fig. 11, the control device 160 of the present embodiment includes a rectifier 67 and a zero-cross detecting circuit 68, and the electromagnetic reciprocating pump 100 can be driven by the AC power source 80. The AC power source 80 is connected to the rectifier 67 of the control device 160 via the connection lines 81, 82. The rectifier 67 is, for example, a full-wave rectified AC power supply voltage of a sine wave as shown in FIG. 12A as a combined diode to be outputted as a rectified voltage as shown in FIG. 12B. The output of the positive electrode side of the rectifier 67 is connected to the positive electrode side circuit 71 of the control device 160, and the output of the negative electrode side of the rectifier 67 is connected to the negative electrode side circuit 72 of the control device 160. In addition, as the 11th As shown, the connection lines 81, 82 between the AC power source 80 and the rectifier 67 are connected to the detection terminals of the zero crossing detection circuit 68. The zero-crossing detection circuit 68 is used to detect the timing of the voltage waveform of the sinusoidal AC power source 80 from positive to negative or negative to positive as shown by point P1 or point P2 shown in FIG. 12A. As shown in Fig. 12C, the timing signal is output to the arithmetic circuit 61 at a timing delayed by a predetermined time ΔTd from the foregoing timing.

The calculation circuit 61 of the control device 160 is the same as the calculation circuit 61 of the control device 60 described above, and stores the set value parameters (1) and 8B shown in Fig. 8A in the internal memory unit. (2) The number of strokes and the like are input from the input/output unit 65, and the value is also stored in the internal memory unit.

Hereinafter, the operation of the control device 160 of the present embodiment will be described with reference to Figs. 13 to 17E. The same operations as those previously described with reference to FIGS. 1 to 10D are omitted or briefly described. In addition, the flowchart of FIG. 13 is the same as the flowchart of FIG. 3 except for the first step addition step S100 in the flow chart shown in FIG. 3, and is the same as the flowchart shown in FIG. The steps are denoted by the same reference numerals and the description is omitted. Further, in the 15A to 17E, the solid lines d3 to d5 indicating the current flowing through the electromagnetic coil 44 show only the change in the central value of the current, and the illustration of the current chopping is omitted.

The operation of the case where the voltage of the AC power source 80 is 100 V and the discharge pressure of the electromagnetic reciprocating pump 100 is 1.0 MPa will be described with reference to Figs. 15A to 15E. First, for the "predetermined period" of the rectified voltage of the AC voltage after full-wave rectification from time t0 to time t3 The time variation of the stroke S, the current I, and the voltage V in the case of conventional control in which ΔTon is continuously energized is briefly described. As shown in Fig. 12C, the rectified voltage after full-wave rectification is applied to the electromagnetic coil 44 at a timing delayed by a predetermined time ΔTd from the timing (zero crossing) of positive and negative switching in the AC voltage waveform. Therefore, as indicated by the solid line g3 in Fig. 15C, the voltage applied to the electromagnetic coil 44 at the time t0 is not zero, but a voltage corresponding to the predetermined time ΔTd is formed. Further, since the voltage of the AC power source 80 is 100 V (root mean square value), the peak voltage of the rectified voltage is 144 V (100 V × √ 2). In the control of the prior art, from the time t0 to the time t3, as shown in Fig. 15C, the rectified voltage is continuously applied. Since the rectified voltage is increased or decreased in a manner corresponding to the period of the AC power supply voltage, the voltage applied to the electromagnetic coil 44 is also increased or decreased in a manner corresponding to the period of the AC power supply voltage as indicated by the solid line g3 in FIG. 15C. . At this time, the current flowing through the electromagnetic coil 44 is gradually increased from the time t0 as indicated by the solid line d3 in FIG. 15B, and then repeatedly: corresponding to the decrease in the applied voltage, and then, with the applied voltage Increase and increase. Since the current flowing through the electromagnetic coil 44 is formed at a moment before the time t1 to give the armature 45 a current value Is of the push-out force larger than the retracting force of the return spring 46, it is started from a moment before the time t0. The armature 45 is moved in the direction of the pump unit 10 (moving forward). Thereby, as indicated by the solid line a3 of Fig. 15A, the stroke S rises from zero. Further, between time t2 and time t3, the stroke S is up to 100%.

Next, the control of the control device 160 of the present embodiment when the set value parameter (1) is used will be described. The control is controlled as follows In the predetermined period ΔTon between the time t0 and the time t3 in the 15A, 15B, and 15D, the current flowing through the electromagnetic coil 44 detected by the current sensor 64 rises. When the upper limit threshold IH3 is reached, the switching element 62 is turned off, and when the current falls to the lower limit threshold IL3, the switching element 62 is turned on. In the 15A, 15B, and 15D, the one-point chain lines b3, e3, and h3 respectively display the stroke S at this time, the current I flowing through the electromagnetic coil 44, and the voltage V applied to the electromagnetic coil 44.

When the start/stop button 66 shown in Fig. 1 is pressed, the zero-cross detecting circuit 68 shown in Fig. 11 extracts the waveform of the AC voltage and detects the timing (zero crossing) of the positive and negative switching in the AC voltage waveform. Thereafter, the zero-cross detecting circuit 68 outputs a signal after a predetermined time ΔTd elapses. As shown in step S100 of Fig. 13, the arithmetic circuit 61 stands by until there is a signal input from the zero-cross detecting circuit 68. When the signal from the zero-cross detecting circuit 68 is input, the arithmetic circuit 61 proceeds to step S101 shown in Fig. 13, and reads the upper limit threshold IH3, the lower limit threshold IL3, the stroke period ΔTs, and the predetermined period ΔTon. Next, as shown in step S102 of Fig. 13, the arithmetic circuit 61 is set to the count of the predetermined period ΔTon of the first signal and the number of strokes by the switching element 62 at the time t0 shown in Fig. 15D. A count of the calculated stroke period ΔTs (predetermined period).

As indicated by the one-point chain line h3 in Fig. 15D, the rectified voltage is applied to the electromagnetic coil 44 at time t0, and the electromagnetic coil 44 starts to flow a current as indicated by the one-point chain line e3 in Fig. 15B. The current flowing through the electromagnetic coil 44 rises and the rectified voltage applied to the electromagnetic coil 44 The change is decreased in response to the change, and then the rise and fall between the upper limit threshold IH3 and the lower limit threshold IL3 are repeated until the time t3 corresponding to the change in the rectified voltage. In the meantime, the calculation circuit 61 executes the current control loop in step S104 shown in Fig. 13. As shown in FIG. 15B, since the detected current does not exceed the upper limit threshold value IH3 until time t3, the arithmetic circuit 61 outputs a signal that the switching element 62 is turned on between the "predetermined period ΔTon" from the time t0 to the time t3. Further, at time t3, the arithmetic circuit 61 determines that the "predetermined period ΔTon" has elapsed, stops the current control loop in Fig. 13, and proceeds to step S105 to turn off the switching element 62, and shifts the stroke. When the period ΔTs, the process returns to step S100.

As described above, the operation of the control device 160 of the present embodiment in the case where the AC power supply 100 of 100 V is used is the same as the operation of the prior art, and the rise of the stroke S of the armature 45 shown by the one-point chain b3 in Fig. 15A is as shown in Fig. 15A. The curve is also substantially the same as the solid line a3 of the case of the prior art, and the stroke S is up to 100% between time t2 and time t3.

Next, the control of the control device 160 of the present embodiment when the set value parameter (2) is used will be described with reference to Fig. 14. In the flowchart shown in FIG. 14, the addition step S200 is the same as the flowchart of FIG. 4 described above except for the step S200 for performing the zero-cross detection, and the current control loop processing systems of steps S220, S230, and S240 are the same. The same as those previously described with reference to FIGS. 5 to 7. The same steps are denoted by the same reference numerals and the detailed description is omitted. The control is controlled in the predetermined period ΔTon between the time t0 and the time t3 in the 15A, 15B, and 15E, and the time lapses from the time t0. The threshold value and the lower threshold value are set to (first upper limit threshold IH1, first lower limit threshold IL1), (second upper limit threshold IH2, second lower limit threshold IL2), (third upper limit threshold IH3, third lower limit threshold IL3) The stage is gradually increased. The broken lines c3, f3, and j3 in FIGS. 15A, 15B, and 15E each show the stroke S at this time, the current I flowing through the electromagnetic coil 44, and the voltage V applied to the electromagnetic coil 44.

Similarly to the previously described operation using the set value parameter (1), when the start/stop button 66 shown in Fig. 1 is pressed, the zero-cross detecting circuit 68 shown in Fig. 11 draws the waveform of the AC voltage. And detect the timing of the positive and negative switching in the AC voltage waveform (zero crossing). Thereafter, the zero-cross detecting circuit 68 outputs a signal after a predetermined time ΔTd has elapsed. As shown in step S200 of Fig. 14, the arithmetic circuit 61 stands by until there is a signal input from the zero-cross detecting circuit 68. When the signal from the zero-cross detecting circuit 68 is input, the arithmetic circuit 61 proceeds to step S201 shown in FIG. 14, and the arithmetic circuit 61 reads the first parameter belonging to the first interval of the set value parameter (2). The upper limit threshold IH1 is different from the first lower limit threshold IL1, the first interval time ΔT1, and the stroke period ΔTs (predetermined period) calculated from the number of strokes and the predetermined period ΔTon. Next, as shown in step S202 of Fig. 14, the arithmetic circuit 61 sets the switching element 62 to ON at the time t0 shown in Fig. 15C, and starts counting the predetermined period ΔTon of the first signal and the first interval time Δ. The count of T1, and the count of the stroke period ΔTs (predetermined period) calculated from the number of strokes.

The calculation circuit 61 executes the current control loop processing shown in step S220 of Fig. 14 until the first interval time ΔT1 is changed. And when the detected current value detected by the current sensor 64 rises to the first upper limit threshold IH1, the switching element 62 is turned off, and the detected current value detected by the current sensor 64 falls to the first When the lower limit threshold value IL1 is set, the switching element 62 is turned on, and the current value is maintained between the first upper limit threshold value IH1 and the first lower limit threshold value IL1.

As indicated by a broken line j3 in Fig. 15E, the rectified voltage is applied to the electromagnetic coil 44 at time t0, and the electromagnetic coil 44 starts to flow a current. When the current flowing through the electromagnetic coil 44 rises to the first upper limit threshold value IH1 between the time t0 and the time t1, the arithmetic circuit 61 turns off the switching element 62. As a result, as indicated by a broken line f3 in Fig. 15B, the detected current value is lowered. However, after the switching element 62 is turned off from the time t1 to the time t1, since the detection current is not lower than the lower limit threshold IL1, the switching element 62 is turned off after the time t0 and the time t1, and the calculation circuit In the 61 series, the switching element 62 is kept in the off state until time t1.

At time t1 shown in FIG. 15A, the arithmetic circuit 61 determines in step S203 of FIG. 14 that the first interval time ΔT1 has elapsed, and stops the current control loop process shown in step S220 of FIG. 14 and proceeds to In step S204 of Fig. 14, the second upper limit threshold IH2 and the second lower limit threshold IL2 and the second interval time ΔT2 belonging to the parameter of the second section in the set value parameter (2) are read. Next, the calculation circuit 61 starts the counting of the second interval time ΔT2, and as shown in step S205 of FIG. 4, it is determined whether or not the second interval time ΔT2 has elapsed, and it is determined that the second interval time ΔT2 has not elapsed. Go to step S230 of FIG. 4 and perform current control loop deal with. The calculation circuit 61 performs a monitoring of whether or not the second interval time ΔT2 has elapsed between the current control loop processing in step S230 of Fig. 4, and also monitors whether or not the predetermined time ΔTon has elapsed.

As indicated by a broken line f3 in Fig. 15B, since the rectified DC voltage (full-wave rectified voltage) is increased after time t1, the detected current value of the electromagnetic coil 44 is increased, and when the rectified voltage (full-wave rectified voltage) is decreased, Correspondingly, the detected current value is also lowered. Therefore, since the detected current value does not rise to the upper limit threshold IH2 in the second interval between the time t1 and the time t2, the calculation circuit 61 is repeatedly executed in the current control loop process shown in step S230 of Fig. 14. Steps S222 and S223 shown in FIG. 5 continue to output a signal (second signal) for turning on the switching element 62. Thereby, the switching element 62 is kept in an on state.

At time t2 shown in FIG. 15A, the arithmetic circuit 61 determines in step S205 of FIG. 14 that the second interval time ΔT2 has elapsed, and stops the current control loop in step S230 of FIG. 14 and proceeds to FIG. In step S206 shown, the third upper limit threshold IH3, the third lower limit threshold IL3, and the third interval time ΔT3 belonging to the parameter of the third section in the set value parameter (2) are read. Next, the calculation circuit 61 starts the counting of the third interval time ΔT3, and as shown in step S207 of Fig. 14, it is determined whether or not the third interval time ΔT3 has elapsed, and it is judged that the third interval time ΔT3 has not elapsed. Go to step S240 of Fig. 14 and perform current control loop processing. The calculation circuit 61 executes between the current control loop processes in step S240 of Fig. 4, monitors whether or not the third section time ΔT3 has elapsed, and also monitors whether or not the predetermined time ΔTon has elapsed.

As shown by the broken line f3 in Fig. 15B, after the time t2, when the detected current value rises to the third upper limit threshold IH3, the arithmetic circuit 61 sets the switching element 62 to be off, and when the detected current value falls to the third lower limit. At the threshold IL3, the switching element 62 is turned on. Thereby, in the third section from the time t2 to the time t3, the current value flowing through the electromagnetic coil 44 is controlled between the third upper limit threshold IH3 and the third lower limit threshold IL3.

At time t3 shown in Fig. 15A, the arithmetic circuit 61 determines in step S207 shown in Fig. 14 that the third interval time ΔT3 has elapsed and the current control loop processing in step S240 of Fig. 4 is stopped. Since the predetermined period ΔTon=ΔT1+ΔT2+ΔT3, the arithmetic circuit 61 judges that the “predetermined period ΔTon” has elapsed when the third interval time ΔT3 has elapsed, and as shown in step S208 of FIG. 4 The output sets the switching element 62 to a signal that is turned off. This signal sets the switching element 62 to the first signal that is turned off. Further, the arithmetic circuit 61 simultaneously restores the count of the "predetermined period ΔTon" to the initial value of zero.

The calculation circuit 61 proceeds to step S209 of Fig. 14, and judges whether or not a predetermined period (a predetermined stroke period ΔTs shown in Fig. 2C) has elapsed, and when it is judged that a predetermined period (predetermined stroke period ΔTs) has elapsed, Proceeding to step S210 of Fig. 4, it is judged whether or not the start stop button 66 is pressed. When there is no stop designation, the count of "predetermined period ΔTs" is reset to zero and the process returns to step S200, and the fourth figure is repeated. Steps S200 to S210 are shown. Further, in step S210 of Fig. 4, when it is judged that the start/stop button is pressed and a stop command is input, the operation is stopped.

As described above, when the AC power supply voltage is 100 V and the discharge pressure of the electromagnetic reciprocating pump 100 is 1.0 MPa by the control device 160 of the present embodiment, the control using the set value parameter (2) is performed. The switching element 62 is turned off in the second half of the first section between the time t0 and the time t1, and the rise of the current flowing through the electromagnetic coil 44 during this period is suppressed. Therefore, as shown by the broken line c3 in FIG. 15A, the stroke S is The change formation is more moderate than the case where the set value parameter (1) is used (a little chain line b3), and reaches 100% a little before the last time t3 in the "predetermined period ΔTon".

Next, an operation in the case where the AC power supply voltage is 200 V and the discharge pressure of the electromagnetic reciprocating pump 100 is 1.0 MPa will be described with reference to FIGS. 16A to 16E. First, the stroke S, the current I, and the voltage V in the case where the alternating voltage is subjected to the conventional control of continuously energizing the "predetermined period ΔTon" from the time t0 to the time t3 after the rectified voltage of the full-wave rectification is applied from the time t0 to the time t3 The time change is briefly explained. Since the voltage of the AC power source 80 is 200 V, the voltage waveform applied to the electromagnetic coil 44 is formed to be supplied from the rectifier 67 to the positive electrode side circuit 71 at a high frequency of 1 to 2 kHz as indicated by a solid line g4 in FIG. 16C. The waveform of the rectified voltage of the negative electrode side circuit 72 is turned on/off. As shown by the solid line g4 in Fig. 16C, the rectified voltage after full-wave rectification is applied to the electromagnetic coil 44 at a timing delayed by a predetermined time ΔTd from the timing (zero crossing) of positive and negative switching in the AC voltage waveform. Therefore, as indicated by the solid line g4 in Fig. 16C, the voltage applied to the electromagnetic coil 44 at the time t0 is not zero, but a voltage corresponding to the predetermined time ΔTd is formed. In addition, due to alternating current The voltage of the source 80 is 200V (root mean square value), so the peak voltage of the rectified voltage is 288V (200V × √ 2). Since the rectified voltage is increased or decreased in response to the period of the AC power supply voltage, as indicated by the solid line g4 in FIG. 16C, the peak value of the voltage applied to the electromagnetic coil 44 is also in accordance with the period of the AC power supply voltage. Ways to increase or decrease. At this time, the current flowing through the electromagnetic coil 44, as shown by the solid line d4 in FIG. 16B, rapidly increases from the time t0, and then repeatedly: decreases in accordance with the decrease in the peak value of the applied voltage, and thereafter, The increase in the peak value of the applied voltage increases. Since the current flowing through the electromagnetic coil 44 is formed between the time t0 and the time t1 to give the armature 45 a current value Is of the push-out force larger than the retracting force of the return spring 46, it is from the middle of the time t0 and the time t1. At the beginning, the armature 45 is moved in the direction of the pump unit 10 (moving forward). Thereby, as indicated by the solid line a4 in Fig. 16A, the stroke S of the armature 45 rises from zero. Also, the stroke S is up to 100% near the time t2 earlier than the case of 100V. In addition, since the solid line d4 in FIG. 16B only describes the central value of the current flowing through the electromagnetic coil 44 and the description of the current chopping is omitted, the maximum current value at the time t3 is observed as the control device using the present embodiment. The case of 160 (single chain line e4, dashed line f4) is slightly larger, but the maximum current value flowing through the electromagnetic coil 44 at time t3 is considerably larger than that of the control device 160 of the present embodiment, and is relatively large. The temperature rise of the electromagnetic coil 44 is also large.

Next, the control of the control device 160 of the present embodiment when the AC supply voltage is 200 V and the discharge pressure of the electromagnetic reciprocating pump 100 is 1.0 MPa is used. Since the voltage of the AC power source 80 is 200 V, unlike the case of 100 V described earlier, as shown by the one-point chain line h4 in FIG. 16D, between the time period t0 and the time t3, the "predetermined period ΔTon" When the current flowing through the electromagnetic coil 44 detected by the current sensor 64 rises to the upper limit threshold IH3, the switching element 62 is turned off several times, and the current is decreased to the lower limit threshold IL3 several times. The switching element 62 is turned on. As shown by the one-point chain line e4 in FIG. 16B, after the current flowing through the electromagnetic coil 44 reaches the first upper limit threshold IH3, the current flowing through the electromagnetic coil 44 is controlled to the upper limit. Between the threshold IH3 and the lower threshold IL3. Therefore, the time for starting the armature 45 to move is slightly earlier than the case of 100 V, but the stroke S is as high as 100% as in the case of 100 V, and is formed between the time t2 and the time t3. As described above, in the control device 160 of the present embodiment, the number of times of switching is significantly reduced as compared with the PWM control of the prior art, and the loss due to the switch is also reduced, and the power consumption is also reduced.

Next, the control of the control device 160 of the present embodiment when the AC supply voltage is 200 V and the discharge pressure of the electromagnetic reciprocating pump 100 is 1.0 MPa is used. As shown by the broken line f4 in FIG. 16B and the broken line j4 in the 16Eth picture, although the number of times the switching element 62 is turned on/off is larger than the case where the set value parameter (1) is used as described above, In the case of 100 V, the current flowing through the electromagnetic coil 44 rises, and the current flowing through the electromagnetic coil 44 is controlled at the time t1 from the first time reaching the first upper limit threshold IH1 to the end of the first interval. 1 upper limit threshold IH1 and first lower limit In the second section from the time t1 to the time t2 between the thresholds IL1, the current flowing through the electromagnetic coil 44 is controlled between the second upper limit threshold IH2 and the second lower limit threshold IL2. In the third section from t2 to the time t3, the current flowing through the electromagnetic coil 44 is controlled between the third upper limit threshold IH3 and the third lower limit threshold IL3. As indicated by a broken line c4 in Fig. 16A, at a later time t1, the stroke S of the armature 45 starts to rise, reaching a slight instant of 100% at time t3. As described above, in the control device 160 of the present embodiment, the time change (the time change curve of the stroke S) of the stroke S of the armature 45 is formed to be substantially the same regardless of the case where the AC 100V is used or the AC 200V is used. . This case shows that the action of the armature 45 is substantially the same regardless of 100V or 200V. Further, as described above, in the case where the set value parameter (2) is used in the control device 160 of the present embodiment, the number of times of switching is also significantly reduced as compared with the case of the PWM control of the prior art, so that the switch is The losses caused are also reduced and the power consumption is also reduced.

Next, the control of the prior art in which the AC power supply voltage is 200 V and the discharge pressure of the electromagnetic reciprocating pump 100 is 0.2 MPa, the control using the set value parameter (1), and the use of the set value parameter (2) In the case of the change of the stroke S of the armature 45, a brief description will be given. Since the control itself is the same as that previously described with reference to Fig. 14, the description is omitted.

In the foregoing description, although it is explained that when the current I flowing through the electromagnetic coil 44 is formed to a certain extent and the electromagnetic force (thrust) generated by the electromagnetic coil 44 exceeds the pressing force of the return spring 46, the electric power is made. The pivot 45 moves toward the pump portion 10 (moving forward), but in more detail, since the armature 45 movement must push the fluid in the chamber 30 out of the discharge tube 11b, when it is guided by the electromagnetic coil 44 When the generated electromagnetic force (thrust) exceeds the total force of the pressing force of the return spring 46 and the force applied to the Teflon film 31 by the fluid pressure, the armature 45 is moved toward the pump portion 10 (going forward) move). Therefore, in the case where the discharge pressure is lowered, the start of the armature 45 is moved earlier than in the case where the discharge pressure is high, and the moving speed of the armature 45 is also increased. In the case where the movement of the armature 45 is faster, since the fluid in the chamber 30 is quickly pushed out in one breath, the fluid having a normal discharge amount or more is discharged. The aforementioned phenomenon is called overfeed.

When the discharge pressure is a low pressure of, for example, 0.2 MPa, the control by the conventional technique, as shown by the solid line a5 in Fig. 17A, causes the stroke S of the armature 45 to rise rapidly, resulting in generation of Feeded as previously described. On the other hand, in the case where the control device 160 of the present embodiment is used, since the current flowing through the electromagnetic coil 44 is controlled, the discharge pressure is as low as 0.2 MPa as indicated by the one-dot chain line b5 and the broken line c5 in Fig. 17A. The low pressure also slows the start of the stroke S of the armature 45, and can suppress the occurrence of overfeeding.

As described above, in the present embodiment, the control device 160 for the AC power source 80 is the same as the control device 60 corresponding to the DC power source described above, and the electromagnetic coil 44 is caused by converting the voltage into a rated voltage by PWM control. Compared with the conventional control method of energization, the number of switching can be significantly reduced to reduce power consumption. In addition, due to Since the maximum value of the current flowing through the electromagnetic coil 44 is smaller than the control method of the prior art, the effect of suppressing the temperature rise of the electromagnetic coil 44 or the direct-acting electromagnetic tube 40 can be suppressed. Therefore, the electronic components are not exposed to high temperatures, and the durability of the machine can be extended. Further, since the voltage of the DC power source is 100V or 200V, the current value flowing through the electromagnetic coil 44 or the current waveform current waveform is controlled to be substantially the same shape, thereby achieving the following effect: the electromagnetic reciprocating pump 100 is not used. Performance has an impact and can be adapted to different power sources. In addition, the effect is achieved that the occurrence of overfeed can be suppressed even if the voltage is different.

In the control device 160 of the embodiment described above, the zero-cross detecting circuit 68 is provided in addition to the calculating circuit 61, but the AC power source 80 may be directly connected to the calculating circuit 61, and the calculating circuit 61 may be used. The timing of switching between positive and negative in the AC voltage waveform is detected, and the timing of delaying the predetermined time ΔTd from the timing is the start control and the switching element 62 is turned on.

The invention is not limited to the embodiments described above, and includes all modifications and alterations of the invention as defined by the appended claims.

10‧‧‧ Pump Department

11a‧‧‧Inhalation tube

11b‧‧‧ spit tube

12‧‧‧Inhalation flow path

13‧‧‧Spit out the flow path

14‧‧‧ recess

15‧‧‧Sucking side check valve

16‧‧‧Spit side reversal

17,22‧‧‧ base

18‧‧‧ fitting recess

19‧‧‧ facing the face

20‧‧‧ Drive Department

23‧‧‧through holes

24‧‧‧Protruding

26‧‧‧ pedestal

27‧‧‧ Face

28‧‧‧Slots

29,52‧‧‧ screws

30‧‧‧ chamber

31‧‧‧Teflon film

32‧‧‧Seat

40‧‧‧Direct-acting electromagnetic tube

41‧‧‧Shell

42‧‧‧ points

43‧‧‧ bottom

44‧‧‧Electromagnetic coil

45‧‧‧ Armature

46‧‧‧Return spring

47‧‧‧ Output shaft

50‧‧‧ frame

51‧‧‧stops

60‧‧‧Control device

61‧‧‧ calculus circuit

62‧‧‧Switching elements

63‧‧‧ diode

64‧‧‧ Current Sensor

65‧‧‧Input and output

66‧‧‧Start stop button

70‧‧‧DC power supply

71‧‧‧ positive side circuit

72‧‧‧negative side circuit

73‧‧‧Input circuit

74‧‧‧Output circuit

75‧‧‧Connected circuit

100‧‧‧Electromagnetic reciprocating pump

Claims (9)

A control device for an electromagnetic reciprocating pump driven by a direct-acting electromagnetic tube having an electromagnetic coil and an armature reciprocatingly among the electromagnetic coils, the control of the electromagnetic reciprocating pump The device includes: a current sensor for detecting a current flowing through the electromagnetic coil; a switching element for turning on/off a DC voltage applied to the electromagnetic coil; and an arithmetic circuit for generating the switching element a control signal for turning on/off; and the control signal includes a first signal and a second signal, the first signal repeating the operation of repeating the switching element after the predetermined period of time And the second signal is set to be turned off when the detected current value detected by the current sensor rises to a predetermined upper limit threshold within the predetermined period, and the foregoing switching element is turned off. When the detected current value falls to a predetermined lower limit threshold, the switching element is turned on. The control device for an electromagnetic reciprocating pump according to claim 1, wherein the upper limit threshold value and the lower limit threshold value are set in response to an elapsed time after the switching element is turned on by the first signal. The control device for an electromagnetic reciprocating pump according to claim 1, wherein The DC voltage applied to the electromagnetic coil is a DC voltage obtained by full-wave rectifying an AC voltage. The control device for an electromagnetic reciprocating pump according to claim 2, wherein the direct current voltage applied to the electromagnetic coil is a direct current voltage obtained by full-wave rectifying an alternating current voltage. The control device for an electromagnetic reciprocating pump according to claim 3, wherein the first signal is turned on at a timing delayed by a predetermined time from a timing at which the AC voltage waveform is switched between positive and negative. The control device for an electromagnetic reciprocating pump according to claim 4, wherein the direct current voltage applied to the electromagnetic coil is a direct current voltage obtained by full-wave rectifying an alternating current voltage. An electromagnetic reciprocating pump control system comprising: a direct-acting electromagnetic tube, comprising an electromagnetic coil, and an armature reciprocatingly moving among the electromagnetic coils; and a current sensor for detecting circulation a current of the electromagnetic coil; and a switching element for turning on/off the DC voltage applied to the electromagnetic coil; the control method of the electromagnetic reciprocating pump is: Repeating the following operation at a predetermined period: after the switching element is set to be turned on, it is turned off after a predetermined period of time elapses; and, during the predetermined period, when the detected current value detected by the current sensor rises The predetermined switching element is turned off when the predetermined upper threshold is reached, and the switching element is turned on when the detected current value falls to a predetermined lower limit threshold. The electromagnetic reciprocating pump control method according to claim 7, wherein the upper limit threshold value and the lower limit threshold value are changed in response to an elapsed time after the switching element is turned on in the predetermined period. The control method of the electromagnetic reciprocating pump according to claim 8, wherein the direct current voltage applied to the electromagnetic coil is a direct current voltage obtained by full-wave rectifying the alternating current voltage, and is switched between positive and negative of the self-alternating voltage waveform. The timing of the delay is up to a predetermined time, and the switching element is turned on in the predetermined period.