JP3291617B2 - Electromagnetic pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pump, and more particularly to a terminal used for applying a drive current to an electromagnetic coil and a means for protecting a resistor disposed between the terminals.

[0002]

2. Description of the Related Art In an electromagnetic pump, a plunger is reciprocated by applying an intermittent pulse to an electromagnetic coil, thereby changing the volume in the pump chamber to suck and pressurize a fluid to perform a pump action. The discharge amount per reciprocation of the plunger of this electromagnetic pump is determined by an energizing time corresponding to a continuous pulse width and an applied voltage corresponding to a pulse wave height, and a current is supplied through a terminal provided on a lead wire of the electromagnetic coil. Had been applied.

An electromagnetic pump used in an oil-fired machine has a discharge rate of several cc to 10 cc per minute, and the discharge performance is not affected by dimensional accuracy of pump components and slight errors in the strength of springs. As a countermeasure against this, a variable resistor is provided and adjusted, and as shown in Japanese Utility Model Publication No. Hei 7-26807, a desired resistor is selected by measuring the capacity of the electromagnetic pump. An example is shown in which a desired discharge amount is obtained.

[0004]

SUMMARY OF THE INVENTION
In the example shown in Japanese Patent Application Publication No. 07-2007, two long terminals and one short terminal are provided and attached to the terminal attachment piece. And
Between the long terminal and the short terminal, a resistor is connected between a resistor mounting portion extending below the terminal mounting piece, and the resistor is
Because it is arranged to protrude below the terminal mounting pieces, the resistor is often damaged not only when manufacturing the electromagnetic pump, but also when touching other parts or touching the hand when attaching the electromagnetic pump to combustion equipment. there were. Due to the breakage of the resistor, no current flowed, and the combustor itself became unusable.

An object of the present invention is to protect a resistor provided between terminals.

[0006]

According to the electromagnetic pump of the present invention, first, second, and third terminal mounting pieces provided on one of the bobbins are provided.
And a third terminal, wherein the first terminal includes a fixed portion, an insertion portion, and a lead wire connection portion, the second terminal includes a fixed portion, an insertion portion, and a resistor mounting portion, and a third terminal. The terminal has a fixed portion, a resistor mounting portion, and a lead wire connection portion, and includes a resistor protection piece, and the resistor protection piece is bent toward the resistor side to protect the resistor. (Claim 1).

For this reason, the resistor protection piece of the third terminal is bent downward from the terminal mounting piece, and the resistor protection piece prevents the resistor protection piece from coming into contact with other components of the apparatus from the front side or touching the hand. It is protected.

The third terminal having the resistor protection piece is formed to be longer or longer in the longitudinal direction than the other first and second terminals (claim 2). Can protect the vessel.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 5, an electromagnetic pump 1 comprises:
A plunger 3 is inserted so as to be able to reciprocate in the cylinder 2. An upper spring 4 is provided above the plunger 3 and a lower spring 5 is provided below the plunger 3 to support the plunger 3 and assist the reciprocating movement of the plunger 3. The upper spring 4 and the lower spring 5 are received by receiving portions 6 and 7 fitted on both ends of the cylinder 2 on opposite sides of the plunger, and the plunger 3 is inserted into the cylinder 2 by the receiving portions 6 and 7. Has been placed. Holes 8 and 9 are formed in the receiving portions 6 and 7.

The cylinder 2 is oil-tightly fitted to a discharge nipple 34 and a suction pipe 22, which will be described later, by O-rings 10 and 27 which are fitted on the upper and lower sides.

The plunger 3 has a through hole 11 at its center.
The suction valve 12 and the spring 13 are disposed in the through hole 11.

The electromagnetic coil 14 is wound around a bobbin 15 made of resin, and is fitted around the cylinder 2. Between the bobbin 15 that supports the electromagnetic coil 14 and the cylinder 12, an upper magnetic pole cylinder 16 is interposed above the magnetic material, and a lower magnetic pole cylinder 17 is interposed below. The bobbin 1
An upper magnetic plate 18 made of a magnetic material is attached to an upper end of the magnetic pole tube 5, and a lower magnetic plate 19 made of a magnetic material is attached to a lower end thereof.
6, 17 and the outer end or the outer plate 30 described below.

The suction pipe 22 is made of resin or the like, has a through hole 23 formed at the center thereof, and has a flange 24 projecting outward above the hole 23.
The lower end of the above-described cylinder 2 is inserted above the, and oil tightness is maintained by the O-ring 27. The suction pipe 22 is assembled by inserting the lower plate 26 from below, engaging with the collar 24, and screwing the outer pipe 30 described below with screws 28.

The outer plate 30 is disposed outside the electromagnetic coil 14 and is made of a magnetic material.
0a, 30a, and a flat portion 30b that is laid between the upper portions of the upright portions.
The lower portions of the three raised surfaces 30a, 30a are bent outward at right angles to become attachment portions 30c, 30c.
0c is screwed to the lower plate 26 with a screw as described above. Further, a hexagonal hole 33 is formed in the center of the flat portion 30b of the outer plate 30 to be engaged with a discharge nipple 34 described below.

The discharge nipple 34 has a circular flange portion 35 on the outer circumference and a hexagonal portion 36 formed in the circumferential direction. A discharge valve 38 and a spring 39 are sequentially housed therein, and a discharge sheet presser 41 provided with a discharge sheet 40 is mounted by being pushed in by an O-ring 42 so as to be kept oil-tight. The discharge nipple 34 is engaged with the hexagonal hole 33 of the outer plate 30, and the discharge sheet retainer 41 comes into contact with the receiving portion 6, thereby forming a passage 8 and a through hole 37 which constitute a downstream passage from the suction valve 12. Are brought into a communication state.

As shown in FIGS. 4 and 5, the terminal mounting piece 50 is provided extending from the upper end of the bobbin 17 to the outside of the outer plate 30, and has a rectangular shape. , Third
Terminal mounting portions 51,5 for mounting the terminals 57,58,59
2, 53 are formed. The terminal mounting portions 51, 5
In the center, holes 54, 54, 5 for fixing terminals are provided.
4 and recesses 55, 55, 55 so that the terminals do not rattle.
Are formed. Further, all the terminal mounting portions 51, 52, 53 of the terminal mounting pieces 50 are provided with long grooves 56, 56, 56.
Are formed.

The first terminal 57 includes an insertion portion 57a to be inserted into a socket (not shown), a fixing portion 57b attached to the terminal attachment portion 51, and a lead wire connection for winding a lead wire of the electromagnetic coil 14. And a cylindrical hole 57d for an eyelet for fixing is formed at the center of the fixing portion 57b. Also, the second terminal 58
Are an insertion part 58a for inserting a socket (not shown), a fixing part 58b attached to the terminal attaching part 52, and a cylindrical hole 58 for eyelets formed for fixing at the center of the fixing part 58b.
d, and a resistor mounting portion 58e for mounting the resistor 61 is provided.

The third terminal 59 has a fixing portion 59b attached to the terminal attaching portion 53, a eyelet cylindrical hole 59d formed for fixing at the center of the fixing portion 59b, and a lead wire of the electromagnetic coil 14. Wire connection part 59c for winding
And a resistor mounting portion 59e for mounting the resistor 61 and a resistor protection piece 59f for protecting the resistor 61. In addition, the width Wf of the resistor protection piece 59f is formed wider than the width Wa between the insertion portions 57a and 58a, and erroneous insertion of the socket does not occur.

The first terminal 57 and the second terminal 58
Are fixed portions 57b, 58b and insertion portions 57a, 58b.
Are equal to each other (length in the longitudinal direction), but the length (length in the longitudinal direction) of the fixing portion 59b of the third terminal 59 and the resistor protection piece 59f is equal to the first length. And the length of the second terminals 57 and 58 is equal to or longer than the length in the longitudinal direction.

In the above-described configuration, the first terminal 57 is attached to the terminal mounting piece 50 of the first, second, and third terminals in the state shown in FIGS. The cylindrical hole 57d is inserted into the hole 54 of the portion 51, and then the cylindrical hole 57d is caulked by a punch.

In the second terminal 58, the cylindrical hole 58d is inserted into the hole 54 of the terminal mounting portion 52, and then the cylindrical hole 59d is caulked with a punch and mounted. At this time, the resistor mounting portion 58e bent is fitted to the long groove 5 described above.
6 and its tip projects toward the lower surface of the terminal mounting piece 50.

In the third terminal 59, the cylindrical hole 59d is inserted into the hole 54 of the terminal mounting portion 53, and then the cylindrical hole 59d is caulked with a punch and mounted. The resistor mounting portion 59e bent at that time is connected to the terminal mounting portion 53.
, And its tip projects toward the lower surface of the terminal mounting piece 50.

First, second, and third terminals 57, 58, 59
Is completed, the first terminal 57 and the third terminal 59 are connected to the respective lead wire connection portions 57.
The leads of the electromagnetic coil 14 are connected to c and 59c. Then, the characteristics of each electromagnetic pump are measured using a dummy resistor (fixed resistance jig), and based on the measurement result, the electromagnetic pump 1 is stratified into a plurality of layers according to the flow rate, and the stratified individual is again fixed with a different resistance value. A desired resistor is selected using a resistance jig. That is, a desired resistor 61 selected corresponding to the electromagnetic pump 1 is inserted from the lower surface side of the terminal mounting piece 50 into a slit formed in the resistor mounting portions 58e, 59e, and is mounted by soldering. It is.

The resistor mounting portions 58e, 59e of the resistor 61
Is completed, the resistor protection piece 59f is bent to cover the resistor 61, whereby the resistor 61 is protected from contact with parts of an external device at the time of assembly or the like.

[0026]

As described above, according to the present invention, the third
The resistors are covered with the resistor protection pieces provided at the terminals of the first and second terminals to prevent external force from being applied.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a right side view of the same.

FIG. 3 is an enlarged sectional view taken along the line AA of FIG. 1;

FIG. 4 is an enlarged perspective view of a main part.

FIG. 5 is a perspective view showing a state before first to third terminals are mounted on the terminal mounting piece of the above.

[Explanation of symbols]

 Reference Signs List 1 electromagnetic pump 3 plunger 12 suction valve 14 electromagnetic coil 15 bobbin 22 suction pipe 30 outer plate 38 discharge valve 50 terminal mounting piece 51 terminal mounting part 52 terminal mounting part 53 terminal mounting part 57 first terminal 57a insertion part 57b fixing part 57c Lead wire connection part 57d Cylindrical part 58 Second terminal 58a Insertion part 58b Fixed part 58e Resistor attachment part 59 Third terminal 59b Fixed part 59c Lead wire connection part 59e Resistor attachment part 59f Resistor protection piece 61 Resistor

Claims (2)

(57) [Claims] 1. A terminal mounting piece provided on one side of a bobbin is provided with first, second, and third terminals, the first terminal including a fixed portion, an insertion portion, and a lead wire connection portion, The second terminal includes a fixed portion, an insertion portion, and a resistor mounting portion, and the third terminal includes a fixed portion, a resistor mounting portion, and a lead wire connection portion, and includes a resistor protection piece. An electromagnetic pump wherein the resistor is protected by bending the resistor protection piece toward the resistor. 2. The electromagnetic pump according to claim 1, wherein the third terminal is formed longer or longer in the longitudinal direction than the first and second terminals.