JPH0429091Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an electromagnetic pump of the type used, for example, for supplying fuel to automobiles, and particularly relates to an improvement in the housing structure thereof.

[Conventional technology]

Electromagnetic pumps used as fuel supply pumps for automobiles, etc. are desired to have a simple structure, do not require much precision in processing and assembling each part, and are capable of stable pump operation. .
However, each of the conventional electromagnetic pumps of this type has advantages and disadvantages, and one that satisfies all of the above-mentioned characteristics has not yet been realized.

For example, this type of electromagnetic pump is often installed on the outside of a car, especially under the floor, and water and mud tend to adhere to it while driving. There is a strong demand for waterproofness in parts, etc.
This is clear from the fact that an electric chamber is formed within the pump housing in which an excitation coil, a transistor, a printed circuit board, and the like are arranged.

For this reason, conventional electromagnetic pumps of this type have a pair of U-shaped cross-sections constituting a pump housing in which the above-mentioned electrical components are arranged, as shown in, for example, Japanese Utility Model Publication No. 57-50542. Generally, a construction is adopted in which an insulating coating is formed on the joint portion of housing members having a shape, and the housing is filled with a foamed member to achieve waterproofness of the pump housing.

[Problem that the invention attempts to solve]

However, according to the electromagnetic pump with the conventional structure described above, the pump housing structure is complicated and has a large number of component parts.Therefore, there are many joints that require the above-mentioned waterproof property, and the work of applying the insulating coating material is difficult. Not only is it troublesome and complicated, but it also takes a long time to dry after application.
It has drawbacks such as poor workability and the need to be careful to prevent the coating material mentioned above from entering the inside of the pump housing and having an adverse effect on internal electrical components. In addition, the foaming material filled into the pump housing foams immediately when its two liquid components are mixed, so quick filling processing is required, which not only poses problems in terms of workability, but also causes problems in the pump housing. This method requires troublesome work such as removing the foam material that protrudes from the gaps formed at the joints, and has the disadvantage that the foaming time after filling is also long.

Therefore, in this type of electromagnetic pump, it has been desired to improve the pump housing structure so that the above-mentioned waterproofness can be easily and appropriately obtained. The problem is the sealing structure at the part where the lead wire is drawn out from the excitation coil or the like disposed inside the housing. In other words, since the lead wire described above has a connector for external connection at its tip, a configuration is adopted in which it is pulled out through a hole drilled in a part of the pump housing through a bushing or the like. This results in an increase in the number of man-hours and is not practical.

In addition, in order to draw out the above-mentioned lead wires from inside the pump housing, a cup-shaped housing that houses the pump components is used, as shown in Japanese Patent Application Laid-Open No. 54-51003 and Japanese Utility Model Application No. 55-139269. A U-shaped notch is formed on the side edge facing the opening end, and a grommet or the like holding the lead wire is inserted into the notch, and the opening end of the cup-shaped housing is closed. There is also known a structure in which the sealing performance of the lead wire draw-out portion is ensured by pressing and holding the lead wire with a pump body, a lid body, or the like. However, in such a conventional structure, it is necessary to form a notch for drawing out the lead wire when processing the cup-shaped housing, which not only causes problems in terms of processability and cost, but also requires the formation of a notch on the housing side. The pressure contact area of the lead wire holding grommet held against the side edge of the notch could not be secured, and it could not be said that perfect sealing performance could be secured. This is because the sealing area between the grommet interposed in the lead wire pull-out portion and the housing side can only be secured by the thickness of the housing.
This is because even though a certain degree of pressing force can be obtained against the housing side of these grommets, it is difficult to obtain a highly reliable sealing state, and there is a need to solve these problems.

In particular, in recent years, this type of electromagnetic pump has come to be installed in light vehicles, etc., and therefore, at the same time as achieving the above-mentioned requirements such as waterproofness, there is also a demand for pumps to be smaller, lighter, and lower in cost. It is difficult to satisfy all of these requirements with the current type as described above, and it is desired that some kind of countermeasure be taken.

The present invention was developed in view of the above-mentioned circumstances, and after reviewing the overall configuration of the pump, it simplified the configuration of the pump housing, simplified the workability and assembly of each part, and improved the lead wire. The housing structure of the electromagnetic pump makes it easy to pull out the pump, ensures reliable sealing at each part of the pump housing, and makes the entire pump smaller, lighter, and lower in cost. The purpose is to obtain.

[Means for solving problems]

In order to meet the above-mentioned demands, the housing structure of the electromagnetic pump according to the present invention includes a cup-shaped housing body that accommodates pump components and a flange on the side to be joined formed at the open end of the housing body and is fixed by caulking. a pump housing consisting of a lid body, and a side edge portion of the lid body that is joined to the flange on the side to be joined at the opening end of the main body is opened laterally at a part of the circumferential direction thereof, and is drawn out from the inside of the housing to the outside. A bulge is provided to form a grommet holding hole for holding the lead wire in order to maintain airtightness and fix the lead wire. A grommet for holding the lead wire pulled out from the handle is inserted and held.

[Effect]

According to the present invention, the structure of the pump housing is simple, and the lead wire can be easily drawn out from the joint between the housing body and the lid, thereby achieving cost reduction and making the pump housing simple and easy. This ensures proper sealing performance.

〔Example〕

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

1 to 3 show an embodiment of the housing structure of the electromagnetic pump according to the present invention,
In these figures, first, the general structure of the electromagnetic pump, which is generally designated by the reference numeral 10, will be briefly explained using FIG. These housing bodies 1 are disc-shaped lids.
1 and the center of the lid 12 are integrally formed with outwardly bulging cylindrical portions 11a and 12a, respectively, and the centers of these cylindrical portions 11a and 12a constitute a fluid outlet and a fluid inlet. Pipe body 1
3 and 14 are fixed to each other by brazing or the like. As is clear from FIGS. 4 and 5, these housing body 11 and lid body 12 are easily and appropriately formed from a metal plate material by press working or the like, and these housing body 1
1 and the lid 12 are connected to the opening on the side of the main body 11 in a state where the lid 12 is placed on the flange to be joined (indicated by 53 in FIG. 4) formed at the open end of the main body 11 and joined. The end edges 11b are integrally assembled by caulking as shown in FIG.
The housing main body 11 and lid body 12 that constitute these pump housings also function as a yoke that forms a magnetic flux path from an excitation coil, which will be described later. This is a storage space where basic mechanical and electrical components are placed. Further, reference numeral 11c in the figure is a mounting bracket for fixing the electromagnetic pump 10 to a side to which it is mounted, such as a vehicle body.

Reference numerals 15 denote the housing main body 11 and the cylindrical parts 11a and 12a of the lid body 12 that constitute the pump housing.
A non-magnetic sleeve member is interposed between the members, in which a magnetic plunger 16 having a through hole 16a is slidably housed, and is normally connected to the fluid outlet side by a return spring 17 disposed on the fluid inlet side. A biasing force is applied. In addition, in the figure, 18 is a suction valve attached to the inlet side end of the sleeve member 15, 19 is a discharge valve provided at the outlet side end of the plunger 16, and the valve body 1 constituting this discharge valve 19
9a is slidably supported within a central cylindrical portion 20a of a ring-shaped member 20 constituting a control valve for preventing fluid leakage that is integrally fixed to the end of the plunger 16. That is, this ring-shaped member 2
0 has the function of guiding the valve body 19a of the discharge valve 19 described above, and also has a cylindrical portion 20.
At the fluid outlet side tip of a, there is a rubber material or synthetic material that opens and closes the inner end of the fluid outlet pipe body 13 that extends to a predetermined length inside the fluid outlet side end of the sleeve member 15 and faces the fluid outlet side. Valve seat 2 made of resin material
1 is provided. Here, reference numeral 22 in the figure is a stopper ring for fixing this ring-shaped member 20 to the end of the plunger 16, and this ring-shaped member 20 is suitably provided with a hole 20b for allowing fluid to pass therethrough. . The above-mentioned control valve for preventing fluid leakage moves integrally within the sleeve member 15 according to the movement of the plunger 16, and when it is not in operation, the inner end 13a of the pipe body 13 is closed by the action of the return spring 17. It can be closed and reliably prevent fluid from leaking to the outlet side, and its practical effects are great. Furthermore, according to this example,
In order to configure the above-mentioned control valve, the inner end 13a of the pipe body 13 on the outlet side is extended within the sleeve member 15 by a predetermined length, so that a pulsation absorption chamber of the discharge side fluid is formed around it. This allows an annular space 23 to be formed.

On the other hand, a resin coil bobbin 31 formed by winding an excitation coil 30 is disposed around the sleeve member 15 that accommodates the plunger 16 described above, and an outer surface of a flange 31a on one side (upper side in the figure) of this coil bobbin 31. , transistors 32 and their heat sinks 33, which constitute an oscillator for passing an intermittent current to the excitation coil 30, are stacked at predetermined intervals and arranged vertically to the surfaces of these transistors 32 and heat sinks 33. Various electronic components 34a, such as resistors and diodes, which together with the transistor 32 described above constitute an oscillator,
A printed circuit board 34 to which is attached, and a holder 35 for holding the printed circuit board 34 at a predetermined distance from each other are sequentially stacked in a direction perpendicular to the surface of the board 34. The stacked body of these pump components is housed in the housing main body 11 constituting the pump housing with the holder 35 side as the tip, and is elasticized by a leaf spring 36 interposed on the bottom side of the main body 11. In a supported state, it is held between the lid body 12 assembled to the main body 11, and
This makes it possible to reduce the size, weight, and cost of the entire pump.

Incidentally, on the outer surface of one flange 31a of the coil bobbin 31, a plurality of studs 37 that engage and support the transistor 32 and the heat sink 33 at predetermined intervals and also support the printed circuit board 34 are integrally erected. Further, a plurality of studs 38 are also erected on the inner surface of the holder 36 opposite thereto. In addition, 37a in the figure is a small diameter part at the tip of the stud 37, and this small diameter part 37
a indicates holes 32a and 33a formed in the transistor 32, the heat sink 33, and the printed circuit board 34;
By being fitted into the holder 3b, it is possible to fix the small diameter part 37a while restricting movement in the surface direction.
These laminates are integrated by being fitted into a hole 38a formed in the stud 38 on the 5 side. Further, in the figure, 35a is a cylindrical portion formed at the center of the holder 35 and holding the sleeve member 15.

Here, the printed circuit board 34 and the holder 35 are formed to have a substantially ring shape in accordance with the coil bobbin 31 described above, and the heat sink 33 has a size and shape that allows the transistor 32 to be attached to the printed circuit board 34. It is formed to have a

Therefore, the electromagnetic pump 1 with the above-described configuration
According to No. 0, the pump housing includes a cup-shaped housing body 11 and a lid body 1 that closes the open end of the cup-shaped housing body 11.
2, and by accommodating and arranging each component in a simple stacked state, the configuration and workability of each part are simplified,
Furthermore, the assembly work etc. can be easily performed. As mentioned above, the rotation of the stacked body such as the coil bobbin 31 housed in the pump housing can be prevented by using the frictional force between each member, or by using a rotation-preventing engagement between the coil bobbin 31 and the lid body 12. It would be best to do this by establishing a section. Furthermore, in the above-described configuration, in order to more appropriately dissipate heat from the transistor 32, the heat dissipation plate 33 may be brought into contact with the inner wall portion of the housing body 11.

Further, in the figure, reference numerals 40 and 41 denote magnetic cylinders that are fitted from both ends between the outer circumference of the sleeve member 15 housing the plunger 16 and the inner wall of the coil bobbin 31. This is for reciprocating the plunger 16. Here, if a wound bushing or a split bushing made by curving a plate material is used as the magnetic cylinders 40 and 41, advantages such as ease of molding can be obtained. Furthermore, in the figure, numerals 42, 43, and 44 are sealing materials for sealing between the inside of the sleeve member 16 and the internal space of the pump housing.

Now, according to the present invention, in the electromagnetic pump 10 having the above-described configuration, the pump housing is joined onto the cup-shaped housing main body 11 and the to-be-joined side flange 53 formed at the open end thereof, and by the open end edge 11b. The lid body 12 is fixed by caulking, and the side edge portion of the lid body 12 that is joined to the flange 53 on the open end of the housing main body 11 is opened laterally in a part of the circumferential direction. A bulging portion 50 that forms a grommet holding hole for holding the lead wire for airtightly maintaining and fixing the lead wire 51 drawn out from the inside to the outside.
between this bulge 50 and the flange 53 of the housing body 11 facing thereto,
The main feature is that a grommet 52 for holding a lead wire pulled out from inside the housing is held in between.

That is, according to the present invention, the pump housing described above is constituted by the housing main body 11 and the lid 12, and the lead wire 51 drawn out from the inside thereof is connected to the joint portion of the housing main body 11 and the lid 12. By pulling the pump housing out while maintaining its sealing properties, the waterproofness of the pump housing can be easily and appropriately ensured. Moreover, it eliminates the need for troublesome work such as coating and filling with foam material, which is required in the past, resulting in significant cost savings. This makes it possible to reduce the amount of water used.

To explain this in detail, according to this embodiment, the housing main body 11 has a substantially cup shape, as is clear from FIGS. 4a, b, and c, and its opening edge 1
1b is formed to have a step-like shape that expands outward, and has a welded side flange 53 which also serves as a gasket attachment part and also serves as a support part for caulking and fixing the lid body 12. The opening edge 11b is formed to rise upward, and a portion of the rising portion in the circumferential direction is cut out as a notch 54. As shown in the figure, the flange 53 on the side to be joined to the lid body, which serves as the gasket attachment part mentioned above, is formed with a tapered surface whose outer side is inclined downward, and a V-shaped annular shape is formed on the surface. A groove 53a is formed. As shown in FIG.
This is to prevent the gasket 55 from slipping inside the housing and coming off due to the force of attaching the gasket 55 and then covering it with the lid 12 and fixing it by caulking. Therefore, the sealing performance between the housing body 11 and the lid body 12 can be ensured.

On the other hand, as is clear from FIGS. 5a, b, and c, the lid 12 has a bulging portion 50 bulging outward in a part of its side edge corresponding to the notch 54 on the housing body 11 side. An insertion hole (grommet holding hole) formed by protruding and opening laterally is inserted into the housing body 11.
It is configured to be formed between the sides.

Further, a grommet 52, which is interposed between the notch 54 of the housing main body 11 and the bulge 50 of the lid body 12 and is used to draw out the lead wire 51 to the outside while maintaining a sealing property, is shown in FIG. As shown in a, b, and c, a portion 52a that is held between the flange 53 on the main body 11 side and the side edge portion of the lid body 12 in the housing described above, and a portion 52b that is locked on the outside of the housing. A cord extraction hole 52c is integrally formed through the center.

According to such a configuration, it is possible to easily and reliably seal the space between the housing body 11 and the lid body 12 described above simply by providing an appropriate crushing margin to the gasket 55 and the grommet 52, and the lead wire can be easily and reliably sealed. 51 can be pulled out of the pump housing with it properly sealed.
This will make its practical effects clear.

Moreover, the electromagnetic pump 10 according to the present embodiment described above
The configuration and operation of this electromagnetic pump 10 other than those described above are well known, and their explanation will be omitted.

Note that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part of the pump may be modified and changed as appropriate. For example, according to the above-mentioned embodiment, a case has been described in which the housing main body and the lid body are integrally fixed by caulking, but the present invention is not limited to this. It is clear that they may be integrated.

[Effect of idea]

As explained above, according to the housing structure of the electromagnetic pump according to the present invention, the housing is joined and caulked onto the cup-shaped housing body that accommodates the pump components and the flange to be joined formed at the open end of the housing body. The pump housing has a pump housing consisting of a lid body, and a side edge portion of the lid body joined to the flange on the side to be joined at the open end of the main body is opened laterally at a part of the circumferential direction and drawn out from the inside of the housing. A bulge is provided to form a grommet holding hole for holding the lead wire in order to maintain airtightness and fix the lead wire. Since the grommet for holding the lead wires is sandwiched between the cup-shaped housing and the lid, which can be easily formed from a metal plate by press processing, the side edge of the lid, which is formed into a substantially plate shape, A grommet for holding the lead wire can be easily inserted and held in surface contact between the bulge that can be easily formed on the bulge and the flange on the opposite side of the housing body to be joined. It is possible to easily and reliably ensure reliable sealing in all parts of the pump housing, including the drawer part, and there are no problems with workability as with conventional methods, resulting in a significant cost reduction. Furthermore, the structure and workability of each part are simplified, and the pump can be made smaller and lighter, which has various practical effects.

[Brief explanation of drawings]

The figures show one embodiment of the housing structure of the electromagnetic pump according to the present invention, in which Fig. 1 is a longitudinal side view showing the general structure of the electromagnetic pump as a whole, and Fig. 2 is a schematic perspective view showing the external appearance of the electromagnetic pump. , Figure 3 is the first
Figures 4a, 4b and 4c are longitudinal sectional views of the housing body constituting the pump housing, an enlarged view of the lead wire pull-out part, an enlarged view of the flange on the welded side which becomes the gasket attachment part, Figures 5a, b, and c are a plan view, a side sectional view, and an enlarged view of the bulging portion of the lid, and Figures 6a, b, and c are a side view, a sectional view, and a plan view of the grommet. 10...Electromagnetic pump, 11...Housing body, 12...Lid body, 13, 14...Pipe body (fluid outlet, inlet), 15...Nonmagnetic sleeve member,
16... Plunger, 17... Return spring, 18... Suction valve, 19... Discharge valve, 30...
Excitation coil, 32...transistor, 33...heat sink, 34...printed circuit board, 40, 41...
. . . Magnetic cylinder, 50 . . . Swelling portion, 51 .

Claims (1)

[Scope of utility model registration request] The pump housing includes a cup-shaped housing body that accommodates the pump components, and a lid body for closing the main body opening that is joined onto the flange for the joined side formed at the open end of the housing body and fixed by caulking or the like. , the side edge portion of the lid body to be joined to the flange on the side to be joined at the open end of the housing main body is opened laterally at a part of the circumferential direction thereof, and a lead wire that is drawn out from the inside of the pump housing is kept airtight; A bulge forming a grommet holding hole for holding a lead wire for fixing is provided, and between this bulge and a flange on the side to be joined of the housing main body opposite to the bulge, a drawer is drawn out from inside the pump housing. A housing structure for an electromagnetic pump characterized by sandwiching and holding a grommet for holding lead wires.