JPH0755335Y2 - Flow rate type electromagnetic pump flow rate adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a flow rate adjusting device provided in a small electromagnetic pump that supplies liquid fuel such as white kerosene to an oil combustor.

(Prior Art) Normally, the flow rate discharged from the electromagnetic pump is determined by the pulse width, pulse height, and pulse width of the drive pulse supplied to the solenoid coil.
And the pulse frequency. In other words,
If the pulse width is long, the energization time will be long, and the reciprocating plunger inserted inside the cylinder will pressurize the fluid against the spring pressure and the open time of the discharge check valve will be longer, so the discharge amount will be longer. When the pulse wave height is high, the electromagnetic force acting on the plunger becomes strong, and the pressure applied to the fluid and the force that pushes the discharge check valve open increases, so that the discharge amount increases. Further, as the frequency increases, the plunger pressurizes the fluid and the number of times the check valve is pushed open increases, so that the discharge amount of the fluid increases.

Therefore, in order to adjust the flow rate of an ordinary electromagnetic pump, a dedicated drive circuit that outputs a drive pulse to be supplied to a solenoid coil is provided, and the pulse width, pulse height, and pulse frequency of the drive pulse output from this drive circuit are adjusted. Although a method of adjusting the discharge flow rate of the fluid has been taken by means of this, small electromagnetic pumps have a large effect on the discharge performance due to slight errors in the shape and strength of the components, etc. There is a problem that a drive circuit adapted to the electromagnetic pump is required, and a normal drive circuit must be replaced together when the electromagnetic pump fails.

For this reason, usually in a small pump, a method of adjusting the flow rate on the electromagnetic pump side is appropriate, and a fixed resistor or variable resistor is connected in series with the solenoid coil to apply the drive pulse supplied to the solenoid coil. A method for adjusting the voltage is known (Japanese Utility Model Publication Nos. 53-31303 and 51-92735).

Japanese Unexamined Patent Application Publication No. 2-5769 discloses that the fixed resistor is connected in series through first and second terminals to which terminals of the solenoid coil are connected, and the first terminal and the fixed resistor. And a third terminal connected to each other,
In the electromagnetic pump in which the drive circuit is connected to the terminal of the
And a third terminal are short-circuited, or a fixed resistor having a predetermined resistance value is connected between the first and third terminals to supply a drive pulse to the solenoid coil, and a short circuit or a predetermined resistance A method is disclosed in which a deviation from a reference discharge amount is derived by measuring a discharge amount of a pump, and a resistance value for keeping the discharge amount of an electromagnetic pump within an allowable range is selected in accordance with the deviation.

(Problems to be solved by the invention) However, at present, the selection of the resistance value of the fixed resistor and the connection of the fixed resistor are mostly performed by an automatic machine (including a semi-automatic machine). Therefore, a shape that allows easy work setting is required.

In the above configuration, when measuring the flow rate, the side surface on which the second and third terminals connected to the drive circuit are formed and the first and third terminals are short-circuited or communicated with each other by a predetermined resistance value. Workability is poor because the conductors or fixed resistors to be connected have the same side surface, and it is difficult to mount the selected fixed resistor because the first and third terminals are close to each other. However, there is a drawback that the work efficiency of the automatic machine is poor.

Therefore, the present invention is to provide a flow rate adjusting device for an electromagnetic pump having a shape that facilitates flow rate measurement by an automatic machine and facilitates mounting of a selected fixed resistor.

(Means for Solving the Problems) However, according to the present invention, the electromagnetic force is generated in the solenoid coil by applying the drive pulse output from the drive circuit to the solenoid coil, and the spring force is generated by the interruption of the electromagnetic force. In a flow-rate electromagnetic pump that reciprocates a plunger urged by a valve to push and open a check valve to discharge a fluid, a first terminal to which one end of the solenoid coil is connected, and a solenoid coil of the solenoid coil. A second terminal to which the other terminal is connected, the second terminal protruding from the side opposite to the first terminal; and a third terminal provided side by side with the second terminal on the side of the second terminal, A fourth terminal short-circuited with a third terminal and arranged side by side with the first terminal on the side of the first terminal, a second terminal and a third terminal, and the electromagnetic pump. The discharge amount of And a fixed resistor having a resistance value.

(Operation) Therefore, in this invention, at the time of measuring the flow rate for selecting the resistance value of the fixed resistor, the side on which the first and fourth terminals connected to the drive circuit are provided and the short-circuit conductor or the predetermined wire. Since it is located on the opposite side to the side where the second and third terminals to which the fixed resistor having the resistance value of is connected is provided, it is easy to measure the flow rate and the second and third terminals are connected to the second and third terminals. By obtaining the predetermined interval, it becomes easy to mount the selected fixed resistor, and the above-mentioned problem can be achieved.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, an electromagnetic pump 1 includes a suction pipe 3 having a suction port 2 for sucking a fluid such as white kerosene, a suction pipe 5 into which the suction pipe 3 is fitted in a hole 4, a cylinder 7, and a blowing nipple 8. Is formed by. In the cylinder 7, a plunger 9 which is reciprocally movable is provided with an upper spring 10 and a lower spring.
A check valve 13 for suction, which is housed together with 11, is provided inside the plunger 9 and is held by a weak spring 12, and a check valve 14 for discharge is provided in the discharge nipple 8.
And a check valve spring 15 for pressing the discharge check valve 14. The electromagnetic coil portion 6 is composed of a coil bobbin 17 formed on the outer peripheral surface of the cylinder 7 and a solenoid coil 18 formed by winding a predetermined number of conductor wires around the coil bobbin 17 in a predetermined number. The magnetic pole 19 and the lower outer magnetic pole 20 are fastened with the screws 21a and 21b, so that the discharge nipple 8 and the suction pipe 5 are fixed. The lower outer magnetic pole assembly 22 integrated with the lower outer magnetic pole 20 is provided to set the electromagnetic pump 1 at a predetermined position.

In the above-described configuration, the electromagnetic pipe 1 includes the electromagnetic coil section 6
When the drive pulse is supplied to the solenoid coil 18 of, the plunger 9 rises upward against the force of the upper spring 10 by the electromagnetic force generated when the drive pipe is turned on, and when the drive pulse is turned off, the plunger 9 moves upward. It is lowered downward by the restoring force of the spring 10. When the plunger 9 is lowered by the reciprocating movement of the plunger 9,
When the check valve 13 for suction is opened and the fluid moves inside and above the plunger 9 and the plunger 9 rises above, the fluid is pressurized, and this pressure causes the check valve 14 for discharge to rise. The fluid is discharged when opened.

2 and 3, the first terminal 31 and the second terminal 32, which are connected to the terminals of the solenoid coil 18 of the electromagnetic coil unit 6, are arranged on the opposite side surfaces,
The third terminal arranged in parallel with the second terminal 32 and the fourth terminal arranged in parallel with the first terminal are formed so as to be short-circuited in the chamber 23 formed under the coil bobbin 17. . A fixed resistor 35 having a resistance value for keeping the flow rate of the electromagnetic pump 1 within an allowable range is mounted between the second terminal 32 and the third terminal 33, and is not normally used. A removable cover 36 is provided to cover the second terminal 32, the third terminal 33 and the fixed resistor 35.

The fixed resistor 35 has a resistance value that allows the flow rate of the electromagnetic pump 1 to be within an allowable range, and this resistance value is selected by the method described below.

First, in the equivalent circuit shown in FIG. 4, the first terminal
The drive circuit 40 is connected to 31 and the fourth terminal 34, and the second terminal and the third terminal are short-circuited by the conductor 41. The drive circuit 40 generates a drive pulse having a reference pulse width, pulse wave height, and pulse frequency. From the drive circuit 40 to the solenoid coil 18 via the first and fourth terminals 31 and 34. Drive pulse is supplied and the electromagnetic pump 1 is set to 0
Operate in the [Ω] state. The discharge amount of the fluid at this time was measured, and it was confirmed by an experiment that the change of the resistance value and the discharge amount Q changes linearly, as is clear from the graph shown in FIG. Based on the change in the graph straight line according to the measured value (for example, Q1 or Q2), the resistance value R that keeps the discharge amount within the supply range (Q ₀ or less) is appropriately selected from several types of fixed resistances prepared. For example,
In the case of Q1, the fixed resistance with the minimum resistance value is selected with the resistance value of R1 or more, and in the case of Q2, the fixed resistance with the minimum resistance value of the resistance value of R2 or more is selected. .

By mounting the fixed resistor 35 having the resistance value R selected by this method between the second and third terminals 32 and 33,
The electromagnetic pump 1 has a discharge amount within an allowable range.

Further, according to this embodiment, since the fixed resistor 35 is attached to the terminals 31 and 34 connecting the drive circuit and the terminals 32 and 33 on the opposite side, the cover 36 can be easily attached and detached.

(Effect of the Invention) As described above, according to the present invention, the terminal which is short-circuited at the time of measuring the flow rate and to which the fixed resistor is welded is provided on the side opposite to the terminal to which the drive pulse from the drive circuit is supplied. Therefore, it is excellent in workability when selecting the resistance value of the fixed resistor and when welding the fixed resistor.

[Brief description of drawings]

FIG. 1 is a sectional view of an electromagnetic pump according to an embodiment of the present invention.
2 is a plan view of the electromagnetic pump of FIG. 1, FIG. 3 is a sectional view of the lower part of the coil bobbin, FIG. 4 is an equivalent circuit diagram of the electromagnetic pump, and FIG. 5 is a resistance value. It is a graph showing the relationship between the discharge amount. 1 ... Electromagnetic pump, 6 ... Electromagnetic coil part, 18 ... Solenoid coil, 31 ... First terminal, 32 ... Second terminal, 33
...... 3rd terminal, 34 ...... 4th terminal, 35 ...... fixed resistor, 36 ...... cover.

Claims (1)

[Scope of utility model registration request] 1. An electromagnetic force is generated in a solenoid coil by applying a drive pulse output from a drive circuit to the solenoid coil, and a spring-biased plunger is reciprocated by the interruption of the electromagnetic force. In a flow-rate electromagnetic pump that pushes a check valve open to discharge a fluid, a first terminal to which one terminal of the solenoid coil is connected and another terminal of the solenoid coil are connected to each other, and A second terminal projecting from the side opposite to the terminal; a third terminal juxtaposed with the second terminal on the second terminal side; a short circuit with the third terminal; A resistance value for connecting the fourth terminal, which is arranged in parallel with the first terminal on the terminal side, and the second terminal and the third terminal, so that the discharge amount of the electromagnetic pump falls within a predetermined range. With a fixed resistor having Flow control device of the flow-type electromagnetic pump, characterized in that the.