JPH1122652A - Electromagnetic pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of components in an electromagnetic pump, and to shorten an assembling time, to reduce the cost. SOLUTION: The insertion parts 50 are provided on the both edges of an outer plate 31 arranged outside of an electromagnetic coil. The insertion parts 50 respectively comprises a body part 53 and an insertion piece 54, and the insertion piece 54 comprises an engagement projecting part 56. Further a mounting plate 30 comprises a part to be inserted 60, in which the insertion part 50 is to be inserted, and the part to be inserted 60 comprises an engagement step part 62. Further the mounting plate 30 is formed of an engagement hole 63 into which the insertion piece 54 is to be inserted, near the engagement step part 62.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pump for supplying fuel to oil-fired appliances.

[0002]

2. Description of the Related Art An electromagnetic pump applies a pulse current to a coil to generate an intermittent magnetic force in the coil, thereby causing the piston to reciprocate, thereby giving a volume change in the space between the suction valve and the discharge valve. The fluid is sucked and pressurized to perform a pump action. The discharge amount per reciprocation of the piston of this electromagnetic pump is determined by the energizing time corresponding to the pulse width and the applied voltage corresponding to the pulse wave height, and the pulse current is applied through a terminal provided at a wire end of the coil. It had been.

A conventional example is disclosed in Japanese Utility Model Laid-Open No. 6-69368. In this electromagnetic pump, the outer plate 32 and the lower plate 26 were attached by screwing the screw 33 through the hole 30 and screwing into the screw hole 39. Usually, these electromagnetic pumps are also automatically assembled. The outer plate 32 is arranged upside down, and the discharge nipple 43 is dropped from above, and is fitted and held in the hexagonal hole 45. After that, one component of the assembly of the exciting coil 18, the cylinder 2 and the suction pipe 22 is inserted into the outer plate 32 from above and below.

At this time, the receiving portion 6 of the cylinder 2 is assembled so as to be pressed against the discharge sheet retainer 50 of the discharge nipple 43. Further, thereafter, the lower plate 26 is externally fitted to and engaged with the suction pipe 22, and the lower plate 26 falls by its own weight, and engages with the collar 24 of the suction pipe 22 while the stepped portion 37,
37, and the ears 30, 30 bulge 38, 3
Fits in 8. Thereby, the lower plate 26 is automatically aligned, the screws 33, 33 are screwed into the screw holes 39, 39 via the holes 31, 31, and the lower portion 26 is attached to the outer plate 32.

[0005]

The relatively small electromagnetic pump has a large number of parts. This, of course, is reflected in the increase in manufacturing costs, and the time required for the assembling process is also prolonged.

Accordingly, an object of the present invention is not only to reduce the number of parts, but also to reduce costs by reducing the time during the assembly process.

[0007]

An electromagnetic pump according to the present invention is provided with insertion portions at both ends of an outer plate disposed outside an electromagnetic coil of the electromagnetic pump, and one of engagement means is provided in the insertion portion.
The insertion plate is provided with a receiving portion, and the other of the engaging means is provided in the receiving portion, and the outer plate is mounted on the mounting plate. (Claim 1).

Therefore, the outer plate can be mounted on the mounting plate without using screws, so that not only the number of components can be reduced but also the assembling time can be reduced.

The engaging means comprises an engaging projection and an engaging step. And an insertion piece is formed in the insertion portion, and an engagement projection is formed on this insertion piece. Further, correspondingly, an inserted portion is formed on the mounting plate, and an engaging step is formed on the inserted portion.

An insertion piece is provided in the insertion portion, and the insertion piece is inserted into an engagement hole formed in the mounting plate, and the engagement between the engagement projection and the engagement step is made. Thus, the outer plate is securely connected to the mounting plate.

[0011]

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

Referring to FIG. 4, first, the basic structure of the electromagnetic pump 1 will be described. In the electromagnetic pump 1, a plunger 3 is inserted into a cylinder 2 so as to be able to reciprocate. The plunger 3 is supported and reciprocates. To assist, an upper spring 6 is provided above the plunger 3 and a lower spring 7 is provided below the plunger 3. The upper spring 6 and the lower spring 7 have a receiving portion 8 whose opposite plunger side is fitted to the end of the cylinder 2. , 9 in which the plunger 3 is housed in the cylinder 2. In addition, holes 10 and 11 are formed in the receiving portions 8 and 9.

The plunger 3 has a through hole 14 formed in the center axis direction thereof, and a suction valve 15 described below is mounted on the upper spring side in connection with the through hole 14.

A coil 19 is wound around a bobbin 20 and disposed around the cylinder 2. An upper magnetic plate 21 is attached to an upper portion of the coil 19, and a lower magnetic plate 22 is attached to a lower portion of the coil 2. An upper magnetic pole cylinder 23 made of a magnetic material is provided so as to be externally fitted to the cylinder 2 while being internally fitted to the bobbin 20 from above.
4 is externally fitted to the cylinder 2 while being internally fitted to the bobbin 20 from below. An outer plate (outer magnetic pole) 3 made of a magnetic material such as iron is provided on the outermost side of the coil 9.
Enclosed at 1.

The suction pipe 26 is made of a resin or the like, has a through hole 27 formed at the center thereof, has a flange 28 projecting outward above the through hole 27, and the lower end of the cylinder 2 is provided with the through hole. The oil-tightness is maintained by an O-ring 29 which is inserted into the upper part of 27 and fits outside. This suction pipe 26
The mounting plate 30 made of resin is inserted from below through the mounting hole 32 and is engaged with the collar 28, and the mounting plate 30 is engaged with the outer plate 31 by the following engaging means. The suction pipe 26 is pressed against the lower magnetic plate 22 side. The electromagnetic pump 1 is assembled by the engagement between the outer plate 31 and the mounting plate 30.

The discharge joint 33 has a disk-shaped flange 34 on its outer periphery.
And a hexagonal portion 35 formed in the axial direction, a through hole 36 is formed in the inside in the axial direction, and is engaged with a hexagonal hole 44 formed in the outer plate 31c to reduce the pressing force from the outer plate 31c. The discharge joint 33 is pressed against the upper magnetic pole cylinder 23. A discharge valve 37, a return spring 38, and a discharge valve seat 39 having a through hole 40 are sequentially housed in the through hole 36 of the discharge joint 33. In contact.
An O-ring 42 is disposed at the open end of the discharge joint 35, and is externally fitted to the cylinder 2 to maintain oil tightness.

As shown in FIG. 5, the suction valve 15 has a suction valve seat 46 fitted in the through hole 14 at one end of the plunger 3, and a spherical valve body 47 seated on the valve seat 46.
And a return spring 48 for pressing the valve element 47, and an externally fitted and attached to the suction valve seat 46, and the return spring 48 and the valve element 4
And a valve case 49 accommodating the suction valve seat 4.
6 is a nonmagnetic metal or resin, the valve body 47 is made of resin, and the valve case 49 is made of resin. The valve case 49 has four long holes 65 formed in the axial direction. On the body side, there is formed a circular hole 66 connected to the through hole 14 of the plunger 3, and a receiving portion 67 of the upper spring 6 is formed at the tip. Although not shown, the suction valve seat 46 may be integrally formed with the plunger 3.

In the above configuration, when a desired pulse is applied to the coil 19, the plunger 3 is displaced upward against the upper spring 6 when the coil 19 is excited. At that time,
The volume between the suction valve 15 and the discharge valve 31 is reduced and the internal pressure is increased. The discharge valve 37 is opened and flows out through the fluid through hole 36. , The volume between the discharge valve 37 and the suction valve 15 expands to a negative pressure, and the fluid pushes up the valve body 47 and flows in. In this way, the fluid is sucked and pressurized by the reciprocating motion of the plunger 3, and the pump action is performed.

At this time, the inflowing fluid flows between the suction valve 15 and the discharge valve 37 through the circular holes 66 and the holes 65. Even if the inflow rate increases and the lift amount of the valve element 47 increases, the opening area of the hole 65 increases, and the resistance does not increase. Therefore, no unnecessary force is applied to the valve element 47, and no irregular movement of the valve element 47 occurs. Then, when the electromagnetic coil 19 is excited again, the plunger 3 is again displaced against the upper spring 6, and the above-mentioned operation is repeated. The action is performed.

As shown in FIGS. 1 to 3, the structure according to the present invention is in the connection between the outer plate 31 and the mounting plate 30, and the outer plate 31 is bent into a U-shape, and the insertion portions 50,
50 are formed, and are inserted into the below-described inserted portions 60, 60 of the mounting plate 30 described below. The insertion portions 50, 50 have main body portions 53, 53 inserted only into the inserted portions 60, 60.
And insertion pieces 54, 5 inserted and engaged not only in the inserted portions 60, 60 but also in the engagement holes 63, 63 formed in the mounting plate 30.
4.

The insertion pieces 54, 54 are attached to the main body portions 53, 53.
Are separated from each other by the grooves 55, 55, and the insertion piece 5
Engagement projections 56 projecting outward on the side opposite to the main body of
Are formed. An engaging means is constituted by the engaging convex portion 56 and an engaging step portion 62 formed on the inserted portion 60 described below.

As described above, the mounting plate 30 has the mounting hole 32 formed at the center thereof, and the inserted portions 60 are erected with the mounting hole 32 interposed therebetween. The inserted portion 60 has a gap 6 having substantially the same thickness as the outer plate 31 and a groove having the same length in the width direction (groove width).
1 and 61, the cutting pieces 61, 61 are partially notched on the side of the mounting hole 32, and the pressing pieces 61 a, 61 a
have.

As shown clearly in FIGS. 1 and 2, the inserted portion 60 has engaging step portions 62 at both ends thereof. Then, the mounting plate 30 of the two engaging step portions 62, 62
On the side, engagement holes 63, 63 are formed in the mounting plate 30. Therefore, when the insertion portions 50, 50 of the outer plate 31 are inserted into the insertion target portions 60, 60 of the mounting plate 30, the insertion pieces 5
4, 54 enter the engagement hole 63 from the inserted portion 60,
The engaging projections 56, 56 engage with the engaging step portions 62, 62, so that the outer plate 31 and the mounting plate 30 are firmly connected.

The connection between the outer plate 31 and the mounting plate 30 is an example in which a convex portion is provided on the side to be inserted and a concave portion is provided on the side to be inserted, other than the illustrated example. The engaging means may be configured using the embodiment, and there is no problem even if a concave portion is provided on the insertion side and a convex portion is provided on the inserted side.

[0025]

[Effect of the Invention] As described above, mounting can be performed by pressing the outer plate against the mounting plate without using screws, not only reducing the assembling time but also reducing the cost by reducing the number of parts. You can contribute.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention, in which a mounting plate is cut away.

FIG. 2 is a cross-sectional view of a main part for explaining an engagement relationship between the outer plate and a mounting plate of the above.

FIG. 3 is an exploded perspective view of an outer plate and a mounting plate of the same.

FIG. 4 is a longitudinal sectional view of the same.

FIG. 5 is a cross-sectional view of the plunger and the suction valve of the same.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electromagnetic pump 3 plunger 15 suction valve 19 coil 26 suction pipe 30 mounting plate 31 outer plate 33 discharge joint 37 discharge valve 50 insertion part 53 body part 54 insertion piece 55 groove 56 engaging projection 60 inserted part 61 vertical piece 62 Joint section 63 Engagement hole

Claims (5)

[Claims] An insertion portion is provided at both ends of an outer plate disposed outside an electromagnetic coil of an electromagnetic pump, one of engagement means is provided in the insertion portion, and a portion to be inserted is provided in a mounting plate. An electromagnetic pump in which the other of the engaging means is provided in each of the portions, and the outer plate is attached to the mounting plate. 2. The electromagnetic pump according to claim 1, wherein said engaging means comprises an engaging projection and an engaging step. 3. The electromagnetic pump according to claim 1, wherein an insertion piece is formed at the insertion portion, and an engagement projection is formed at the insertion piece. 4. The electromagnetic pump according to claim 1, wherein an insertion portion is formed on the mounting plate, and an engagement step is formed on the insertion portion. 5. The insertion part is provided with an insertion piece, and the insertion piece is inserted into an engagement hole formed in the mounting plate.
Electromagnetic pump as described.