JPH0582044B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in electromagnetic coils used in electromagnetic pumps for supplying liquid fuel such as kerosene.

[Conventional technology]

Conventionally, in electromagnetic pumps that discharge liquid fuel, an electromagnetic coil converts electromagnetic force into mechanical force.
The liquid fuel is discharged by the mechanical force. That is, this electromagnetic coil is repeatedly excited by intermittent current supplied in the form of pulse current from a power supply, and generates an electromagnetic force corresponding to the pulse width and pulse height for each pulse, which causes the plunger in the electromagnetic pump to move. It is driven back and forth. The liquid fuel is discharged during the forward movement of the plunger.

This electromagnetic coil is composed of a coil, a coil bobbin consisting of a hollow shaft around which the coil is wound, and flanges integrally formed on the upper and lower ends of the hollow shaft, and further connects the electromagnetic coil to a power source. In order to do this, a terminal block is provided that extends in the radial direction from a part of the collar at the upper end of the coil bobbin, and a connection terminal that connects to the power source side is provided from the top surface of the terminal block toward the front (radial direction).

In addition, in order to connect the terminal of the wound coil using the above connection terminal, the coil terminal is pulled out from the coil winding part below the terminal block through the terminal block to the base of the connection terminal on the top surface. was connected.

[Problem to be solved by the invention]

However, since the coil terminal is pulled out to the top of the terminal block and connected to the terminal, the connection is maintained in this stretched state, which increases the risk of the coil terminal being disconnected. There was a problem.

This invention has been made in view of the above, and has a connecting member on the lower surface of the terminal block, and both ends of the wound coil are fitted into a guide groove and a through hole drilled to face the guide groove. It is an object of the present invention to provide an electromagnetic coil which is guided to the above-mentioned connecting member through a pin, and which has an extra length at the end of the coil when the pin is removed.

[Means to solve the problem]

This invention relates to an electromagnetic coil consisting of a hollow shaft around which a coil is wound and a collar integrally formed at the upper and lower ends of the hollow shaft, in which a terminal is provided that extends in the radial direction from a part of the upper end collar. a base, two lower connecting members having conductivity arranged side by side in the left and right direction orthogonal to the radial direction on the lower surface of the terminal block, and a flange at the upper end at a left and right position on the terminal block side. a guide groove formed by a groove cut out from the hollow shaft side toward the lower connecting member within the wall thickness of the flange; and a guide groove in the vertical direction facing the guide groove from the upper surface of the flange at the upper end. It comprises a through-hole and a pin that can be inserted into and removed from the through-hole, and the pin is inserted into the through-hole during coil winding and is removed from the through-hole after winding. .

[Effect]

According to this invention, first, the pin is inserted into the through hole, and then the coil is guided from one of the lower connecting members to the hollow shaft along the guide groove via the outside of the pin (by detouring). A coil is then wound around the hollow shaft. When winding of the coil is completed, the end of the coil is guided from the outside of the other pin (by detouring) along the other guide groove and connected to the other lower connecting member. Since the pin is freely insertable and removable, when the pin is subsequently removed from the through hole, an extra length corresponding to the detour described above is created at the coil end that was tensioned.

〔Example〕

FIG. 6 shows a sectional view of the entire electromagnetic pump to which the electromagnetic coil according to the present invention is applied.

In the figure, the electromagnetic pump 20 has a cylinder 21
A suction port 22 and a discharge port 23 are provided at both ends thereof. Further, inside the cylinder 21, a plunger 24 made of a cylindrical magnetic material and having a free piston shape is housed, and springs 25 and 26 are disposed in front and rear to keep the plunger 24 elastically stationary. Inside the plunger 24 is a suction check valve 28 held down by a weak valve spring 27.
However, discharge check valves 30 held down by weak valve springs 29 are arranged in front of the plunger 24 in the forward movement direction.

Further, a separate cylindrical suction pipe 31 is connected to the cylinder 21, and the spring receiving part 32 of the spring 26 and the suction port 22 are on the suction pipe 31 side. Filter 33 and ring 34
It has a structure that fastens with. Note that without using the ring 34, the filter 33 is connected to the suction port 22.
It can also be attached by heat welding to the peripheral surface. Alternatively, the suction pipe 31 side may be continuously integrated with the cylinder 21 by a single pipe.

An electromagnetic coil 1 is provided on the outer periphery of the cylinder 21 . This electromagnetic coil 1 consists of a hollow shaft 2a, a coil bobbin 2 having flanges 2b and 2c integrally formed at the upper and lower ends of the hollow shaft 2a, and a coil 3 wound around the hollow shaft 2a, and has a U-shaped cross section. It is fixed to the cylinder 21 by a yoke 4 which also serves as a shaped mounting board.

A terminal block 5 extends radially and slightly upward from a portion of the periphery of the collar 2b. This terminal block 5 is provided with a plurality of connection terminals so that two terminals of the coil 3, a discharge amount adjusting resistor, and two lead wires from a power source can be connected, as will be described later.

1 to 3 are views showing one embodiment of the electromagnetic coil according to the present invention, in which FIG. 1 is a plan view, FIG. 2 is a front view, and FIG. 3 is a side view.

In the figure, 21a is a hexagonal discharge side joint that is screwed into the outer peripheral part of the cylinder 21, 6 is a flat plate material that is screwed together with the yoke 4 and screws 6a, and the discharge side joint 21a is connected to the hexagonal hole 6b of the flat plate material 6. Since it is in the fitted state, the discharge side joint 21a for the yoke 4
The posture of the discharge side joint 21a is fixed to prevent rotational deviation of the discharge side joint 21a. Further, the lower end of the yoke 4 is bent left and right to extend, and fastening holes 4a and 4b for fastening to a combustor or the like in which the electromagnetic pump 20 is installed are bored at approximately the center thereof. .

As described above, the terminal block 5 extends integrally from a portion of the peripheral edge of the collar 2b in the radial direction and slightly upward, and has a flat plate portion 5a having a horizontal surface at its end. By extending the terminal block 5 with a slight upward inclination, it is possible to prevent it from becoming an obstacle to the coil winding work.

Conductive long terminals 7 and 8 are located on the left and right sides of the flat plate portion 5a, and long terminals 7 and 8 are located at appropriate positions on the left side (see Figures 1 and 2) of the center of the flat plate portion 5a. Short conductive short dimension terminal 9
are provided so as to pass through the flat plate portion 5a in the vertical direction.

The long dimension terminals 7 and 8 have an upper connecting portion 7 which is valley-folded along a chain line, as shown in the overall shape in FIG.
a (8a), lead wire connection part 7b (8a) extending forward
b) and the lower connecting part 7 that extends on both sides and is folded in a mountain
c, 7c' (8c, 8c').

As shown in FIG. 2, this long dimension terminal 7 passes through the flat plate part 5a in the vertical direction, and has an upper connecting part 7a above it, a lead wire connecting part 7b to the left, and a penetrating part with the flat plate part 5a. The lower connecting portion 7c is located below the lower connecting portion. Similarly, the long dimension terminal 8 passes through the flat plate part 5a in the vertical direction, and an upper connecting part 8a is formed above the flat plate part 5a, and a lead wire connecting part 8 is formed on the left and right sides.
b, and the lower connecting portion 8c is located below from the penetrating portion with the flat plate portion 5a. Furthermore,
The short-dimension terminal 9 has an upper connection portion 9a extending upward from the penetrating portion with the flat plate portion 5a and a lower connection portion 9 extending downward.
b, 9b'(9b' is not shown).

The lower connection parts 7c, 8c, and 9b are used to connect and fix the coil terminals of the wound coil 3 and other electrical members, such as diodes for half-wave rectification, which are connected as necessary. , one side (the left side in FIG. 2) has an uneven shape to prevent it from coming off. In addition, each lower connection part 7c', 8
c' and 9b' are bent at the bottom surface of the terminal block 5 to prevent the respective terminals from coming off. Long dimension terminal 7,
By configuring 8 as shown in FIG. 4, it can be used for both the left and right sides.

Further, on the left and right positions of the part of the collar 2b of the coil bobbin 2 where the terminal block 5 is extended, there are second and third rings.
Guide groove 10 for the coil terminal as shown in the figure
a, 10b are formed, while the base 5 of the terminal block 5
Near the left and right positions of b, as shown in FIG. 1, through holes 11a and 11b are formed which reach the guide grooves 10a and 10b in the vertical direction.

FIG. 5 is a sectional view taken along the line in FIG. 2, showing the structure of the guide grooves 10a, 10b and the through holes 11a, 11b. Note that the coil 3 is omitted.

In the figure, the collar 2b has a double structure with gaps within its wall thickness at the left and right positions on the front terminal block 5 side. In other words, this gap is the guide groove 1.
0a and 10b, and in FIG.
A is formed on the left side from the groove bottom 100a indicated by a broken line, and the guide groove 10b is formed on the right side from the groove bottom 100b indicated by a broken line. Groove bottom 1 of guide groove 10a
00a guides the starting point side of the coil end, and is formed from the circumferential surface of the hollow shaft 2a toward the lower connecting portion 7c. On the other hand, the groove bottom 1 of the guide groove 10b
00b guides the end point side of the coil end, and is formed from a position (corresponding to the diameter of the wound coil) somewhat away from the circumferential surface of the hollow shaft 2a toward the lower connecting portion 9b.

Further, the through hole 11a is bored on the left side of the groove bottom 100a, that is, facing the guide groove 10a, while the through hole 11b is bored on the right side of the groove bottom 100b, that is, facing the guide groove 10b.

Although not shown in the figure, the through hole 11
The pin inserted into and removed from the pins a and 11b has a cylindrical shape with a diameter that fits into the through hole, and may further include a grasping portion with a larger diameter head. In addition, the dimensions of the pin are
It is sufficient that the lower end thereof contacts at least the lower surface of the guide groove when inserted into the through holes 11a and 11b. In addition, the guide grooves 10a, 10b
Although this is a preferred embodiment in which the starting point and ending point of the coil end are distinguished, the shape of the guide groove may be different from that described above, or the left and right sides may have the same shape.

Next, I will explain the coil winding work.
Before winding the coil onto the hollow shaft 2a, pins are inserted into the through holes 11a and 11b, and the end of the coil, for example, the starting point, is connected to the lower connection part 7c, and the outer side of the pin is inserted. From there, it is guided to the hollow shaft 2a via the guide groove 10a and wound. On the other hand, after winding, the end point of the coil end is guided from the outside of the pin to the lower connection part 9b via the guide groove 10b and connected. After completing this work, by removing the pins from the through holes 11a and 11b,
Extra length is provided at the end of the stretched coil during winding to prevent shearing of the coil. In this way, it is possible to easily provide an extra length at the end of the wound coil.

In addition, since the coil terminal is connected to the lower connection member below the terminal block, there is no need for a special guide structure to lead it to the top of the terminal block, and the lead wire can be short, eliminating the risk of cutting. is reduced.

Now, the base 5b of the terminal block 5 has a horizontal surface, and only the left and right ends thereof are formed in a slope shape, and the locking portions 12a, 12b are tapered on the outer surface of the slope.
is formed. The locking portions 12a, 12b are for ensuring secure attachment to a cover (not shown) used to prevent electrical leakage when the cover is attached.

The two lead wires for supplying drive signals obtained from the power supply in pulse form or by half-wave rectification of the commercial power supply have, for example, crimp terminals attached to their tips, and these terminals are connected to the lead wires. Connection part 7
b, 8b can be easily connected to each other while canceling out the mounting forces from the left and right directions.

Reference numeral 13 designates the above-described resistor for adjusting the discharge amount, and the resistor 13 selected from the results of the discharge amount test and measurement is fixedly connected between the upper connecting portions 9a and 8a of the upper surface of the terminal block 5 by soldering or the like. Upper connection parts 7a, 8a,
9a so that the resistor lead wire etc. can be easily engaged.
A groove is cut out at the tip. Also, resistance 1
3 actually sucks liquid fuel into the electromagnetic pump 20 from the suction pipe 31 and inspects the discharge amount, and after it is selected, it is connected to the terminal block 5, so that liquid fuel that adheres to the suction pipe 31 during the connection work is removed. The resistor 13 is connected to the upper surface of the terminal block 5 so that it can be easily connected with the discharge port 23 facing upward so that the discharge port 23 does not hang down to the terminal block 5 side.

Also, this may cause the resistor to come off during operation,
Or, even if the solder melts due to abnormal heating, it will not easily fall downward.

Note that the vertical piece 5c formed on the upper surface of the flat plate portion 5a near the inner side of the upper connecting portion 8a functions as a support for connecting and arranging the resistor 13 at a central position between the upper connecting portion 9a and the upper connecting portion 8a. It is something.

〔Effect of the invention〕

As explained above, according to the present invention, a guide groove for the coil terminal is provided within the wall thickness of the collar on which the terminal block extends, and a pin that can be inserted and removed freely is provided facing the guide groove. Therefore, it is possible to easily, quickly and reliably provide an extra length to the coil terminal simply by inserting and removing the pin, and the risk of breakage is also eliminated.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the electromagnetic coil according to the present invention, Fig. 2 is a front view thereof, Fig. 3 is a side view thereof, Fig. 4 is an overall configuration diagram of a long terminal, and Fig. 5 are the guide grooves 10a, 10b and the through hole 11a,
FIG. 2 is a cross-sectional view taken along the line V-V, showing the configuration of the coil 11b, with the coil 3 omitted, and FIG. 6 is a cross-sectional view of the entire electromagnetic pump to which the electromagnetic coil according to the present invention is applied. 1... Electromagnetic coil, 2... Coil bobbin, 2a
...Hollow part, 2b, 2c...Tsuba, 3...Coil,
4... Yoke, 5... Terminal block, 5a... Flat plate part,
5b... Base, 7, 8... Long dimension terminal, 9... Short dimension terminal, 7a, 8a, 9a... Upper connection part, 7
b, 8b...Lead wire connection terminal, 7c, 8c, 9
b... lower connection part, 10a, 10b... guide groove,
100a, 100b...groove bottom, 11a, 11b...
...Through hole, 12a, 12b...Locking part, 20...
Electromagnetic pump, 21... cylinder, 22... suction port, 23... discharge port, 24... plunger, 2
5, 26... Spring, 27... Valve spring, 28... Suction check valve, 29... Valve spring, 30... Discharge check valve, 31... Suction pipe, 32... Spring receiver, 3
3...filter, 34...ring.

Claims (1)

[Claims] 1. In an electromagnetic coil consisting of a hollow shaft around which a coil is wound and a collar integrally formed on the upper and lower ends of the hollow shaft, a terminal block extending radially from a part of the upper end collar; two lower connecting members having conductivity arranged side by side in the left and right direction orthogonal to the radial direction on the lower surface of the terminal block; a guide groove formed by a groove cut out from the hollow shaft side toward the lower connecting member within the wall thickness of the guide groove; An electromagnetic device comprising a through hole and a pin that can be inserted into and removed from the through hole, the pin being inserted into the through hole during coil winding and removed from the through hole after winding. coil.