JPH0444859Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to improvements in electromagnetic pumps of the type used, for example, for supplying fuel to automobiles.

[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.

In other words, conventional electromagnetic pumps of this type:
For example, as shown in Japanese Utility Model Publication No. 57-20832, a pump housing is formed by combining a pair of housing members having a substantially U-shaped cross section, and a sleeve member housing a plunger is disposed through the pump housing. A so-called rectangular type is generally well known, in which both ends are held by substantially cylindrical inlet fittings and outlet fittings.

According to such a conventional rectangular type electromagnetic pump, a coil bobbin formed by winding an excitation coil so as to loosely fit around the sleeve member is disposed in the pump housing, and the coil bobbin is formed by winding an excitation coil so as to loosely fit the sleeve member into the pump housing. The outlet fitting is fixed to the pump housing by fitting or the like so that a small diameter cylindrical portion formed at the inner end thereof is fitted between the coil bobbin and the sleeve member. Further, between the fluid passage in the sleeve member mentioned above and the space in which the excitation coil, etc., in the pump housing is arranged, a cylindrical sealing material fitted to the outer circumferential part of the sleeve member is connected from both ends thereof to the above-mentioned mounting It is sealed by being compressed at the end of the tool.

[The problem that the idea aims to solve]

By the way, the electromagnetic pump with the conventional structure described above not only has a large number of components and is complicated in structure, but also has problems in terms of workability and assembly. This was a major problem in terms of reducing costs.

For example, in the conventional structure described above, in order to obtain appropriate and smooth reciprocating motion of the plunger by the excitation force of the excitation coil, the inner end of the fixture that holds both ends of the sleeve member is formed as a small diameter cylindrical part,
A configuration in which these are fitted between a sleeve member and a coil bobbin is generally adopted. In such a structure, the small-diameter cylindrical portion described above has a great advantage in appropriately configuring the magnetic flux path, improving magnetic efficiency, and ensuring appropriate pump operation. Since the forming process involves cutting, it is troublesome and complicated, leading to high costs, and it is difficult to ensure accuracy, and in some cases, it may lead to deformation of the sleeve member, making it difficult to ensure proper operation of the plunger. This resulted in drawbacks such as the inability to do so.

In addition, as a method that does not use the small diameter cylindrical part of each of the above-mentioned fittings, according to Japanese Utility Model Publication No. 52-36964, etc., a sleeve member housing a plunger is held by penetrating the coil bobbin, and plates are attached to both ends of the coil bobbin. It is also known that thick yoke members are laminated and arranged, but in such a structure, since the plate thickness of the yoke member is thick,
This poses a problem not only in making the pump smaller and lighter, but also in terms of magnetic efficiency for driving the plunger, making it difficult to obtain proper and reliable pump operation.

In particular, in recent years, this type of electromagnetic pump has come to be installed in light vehicles, etc., and as a result, there is a strong demand for pumps that are smaller, lighter, and lower in cost. It is difficult to satisfy such demands, 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 structure of the pump, it simplified the configuration of each part, reduced the number of component parts, and improved the workability and assembly of each part, as well as its operation. It is an object of the present invention to provide an electromagnetic pump that can improve the above reliability and achieve a reduction in size, weight, and cost of the pump as a whole.

[Means to solve the problem]

In order to meet the above-mentioned demands, an electromagnetic pump according to the present invention consists of a sleeve member housing a plunger, a coil bobbin for winding an excitation coil disposed around the sleeve member, and a winding bush or a split sleeve. a pair of magnetic cylindrical bodies that form a magnetic flux path from the excitation coil by being fitted on both ends in the axial direction between the sleeve member and the inner peripheral part of the coil bobbin; A pump housing for accommodating pump components consists of a cup-shaped housing made of a magnetic plate material having a holding part for holding the outer end of each magnetic cylinder, and a lid body which is caulked and fixed to close the open end of the cup-shaped housing. A cylindrical sealing material is fitted and interposed between the magnetic cylindrical bodies on both ends of the sleeve member at the center of its outer periphery, and at least one end of the sleeve member is provided with a seal between the internal passage and the pump housing internal space. An annular sealing member is provided within the holding portion on the pump housing side and interposed between the outer end of the magnetic cylinder and the corresponding outer end of the magnetic cylinder.

[Effect]

According to the present invention, the pump housing is constituted by a cup-shaped housing made of a magnetic plate material and a caulked and fixed lid body that closes the open end of the cup-shaped housing, and a magnetic tube that forms a magnetic flux path together with the pump housing. The body is composed of a rolled bush or split sleeve made of curved magnetic plate material, which is fitted onto both ends of the sleeve member and held by a holding part formed on the cup-shaped housing and the lid body. As a result, the molding process and assembly work are significantly simplified compared to conventional methods, making it possible to significantly reduce costs.In addition, each necessary part can be sealed with a simple sealing material, and the fluid passage area can be sealed. It is possible to ensure a safe and reliable airtight condition between the electrical room and the electrical room.

〔Example〕

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

Figures 1a and 1b show an embodiment of the electromagnetic pump according to the present invention. To explain, 11 is a cup-shaped housing body constituting the pump housing, 12 is a disc-shaped lid body that closes the open end of the housing body, and at the center of the bottom of the housing body 11 and the center of the lid body 12, there is an outer wall. Cylindrical portions 11a and 12a that bulge out serve as holding portions that hold both ends of a non-magnetic sleeve member 15 and the respective outer ends of magnetic cylinders 40 and 41 fitted on both ends of the non-magnetic sleeve member 15 in the axial direction. Pipe bodies 13 and 14, which are formed integrally and constitute a fluid outlet and a fluid inlet, are fixed to the centers of these cylindrical parts 11a and 12a, respectively, by brazing or the like.

In addition, these housing main body 11 and lid body 1
2 can be easily and appropriately formed from a magnetic plate material by pressing, drawing, etc., and the housing main body 11 and the lid 12 can be formed by connecting the opening edge 11b on the main body 11 side to the lid 12. It is integrally assembled and fixed by caulking the peripheral edge. 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 the figure, 18 is a suction valve attached to the inlet end of the sleeve member 15, and 19 is a plunger 16.
A valve body 19a constituting this discharge valve 19 is a discharge valve provided at the outlet side end of the plunger 1.
The ring member 20 is slidably supported within a central cylindrical portion 20a of a ring-shaped member 20 that constitutes a control valve for preventing fluid leakage that is integrally fixed to the end portion of the ring member 6. That is, this ring-shaped member 20 is connected to the discharge valve 1 described above.
It also has the function of guiding the valve body 19a of No. 9, and extends a predetermined length into the fluid outlet side end of the sleeve member 15 and faces the fluid outlet side tip of the cylindrical portion 20a. Fluid outlet pipe body 1
A valve seat 21 made of rubber or synthetic resin is provided to open and close the inner end of the valve seat 3 . Here, 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. There is. 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 of the pipe body 13 is moved by the action of the return spring 17.
3a and can reliably prevent fluid from leaking to the outlet side, which has a great practical effect. Furthermore, according to this embodiment, the inner end 13a of the outlet side pipe body 13 for configuring the above-mentioned control valve
is extended within the sleeve member 15 by a predetermined length,
An annular space 23 serving as a pulsation absorbing chamber for the fluid on the discharge side is formed around it.

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 which is assembled to the main body 11.

According to such a configuration, it is possible to improve the ease of assembling the transistor 32, the printed circuit board 34, etc., and it is also possible to prevent the electronic components 34a, etc. on the printed circuit board 34 from being shot, and the advantages thereof are as follows. big.

Here, one flange 3 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 on the outer surface of the stud 1a. A plurality of studs 38 are also erected on the inner surface of the holder 35. In addition, 37a in the figure is a small diameter part at the tip of the stud 37, and this small diameter part 37a
are the holes 32a and 3 formed in the transistor 32, the heat sink 33, and the printed circuit board 34.
3a; By being fitted into 34b, it is possible to fix the small diameter part 37a in a state where movement in the plane direction is restricted, and this small diameter part 37a is formed in the stud 38 on the side of the holder 35. Hole 3
These laminates are integrated by being fitted into 8a. Furthermore, in the figure, 35a is a cylindrical part that protrudes from the center of the holder 35 and holds the sleeve member 15. Further, in this embodiment, the printed circuit board 34 and the holder 35 are formed to have a substantially ring shape to match the coil bobbin 31, and the heat sink 33 is large enough to allow the transistor 32 to be attached to the printed circuit board 34. The figure shows a case in which it is formed in a fan-like shape.

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-stopping engagement between the coil bobbin 31 and the lid body 12. It is best to do this by creating a joint. Further, 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.

Now, according to the present invention, in the electromagnetic pump 10 having the above-described configuration, the outer peripheral surface of the sleeve member 15 housing the plunger 16 and the coil bobbin 31 for winding the excitation coil 30 arranged around the outer peripheral surface of the sleeve member 15
A pair of magnetic cylindrical bodies 40 and 41, which are fitted from both ends in the axial direction and form a magnetic flux path from the excitation coil 30, are formed by curving a magnetic plate material. The sleeve member 15 is formed into a rolled bush as shown in FIG. 1b or a split sleeve as shown in FIG.
A cylindrical sealing material 42 is fitted and interposed between the sleeve member 15 and the annular sealing materials 43 and 44 that block the internal passage and the pump housing internal space at both ends of the sleeve member 15. One side (in this embodiment, the sealing material 43 at the outlet side end) is interposed between the outer end of the corresponding magnetic cylinder 40 on the bottom side of the cylindrical part 11a, which serves as the holding part on the pump housing side. It is characterized by the fact that it is provided in parallel.

That is, the magnetic cylinders 40 and 41 described above are connected to the outer circumference of the sleeve member 15 and the coil bobbin 31.
These magnetic cylinders are inserted from both ends between the inner wall of the excitation coil 30 and are necessary for reciprocating the plunger 16 by the excitation force of the excitation coil 30. If a cylindrical body is used, the molding process is troublesome and complicated, and it is difficult to obtain appropriate processing accuracy, leading to high costs.According to the present invention, such problems arise. It can wipe out the problem. This is because if a winding bush or split bush that can be easily formed by curving a magnetic plate material is used as the above-mentioned magnetic cylinders 40 and 41, the workability will be greatly improved, and the processing accuracy will be improved. It is easy to assemble and requires no
It is easily understood that cost reduction can be achieved.

Here, if the magnetic cylinders 40 and 41 made of the above-mentioned rolled or split bushings are used, gaps will be created in the circumferential direction, and there is a risk that the fluid flowing inside the sleeve member 15 will leak into the pump housing. , according to the present invention, the magnetic cylinders 40, 41
A cylindrical sealing material 4 is attached to the outer periphery of the sleeve member 15 between
2 is inserted into the magnetic cylinder 4 from both ends.
0.0, 41 to ensure sealing between the sleeve member 15 and the coil bobbin 31, and at both ends of the sleeve member 15 interposed between the housing main body 11 and the lid body 12 constituting the pump housing. A reliable sealing state can be obtained by sealing materials 43 and 44 such as O-rings.

Further, a sealing material 42; 4 for sealing between the sleeve member 15 and the pump housing is provided.
3 and 44, sealing materials 42 and 4 are particularly fitted to the outer circumference of the sleeve member 15 and interposed between the magnetic cylinders 40 and 41 and on the outer end side of the magnetic cylinder 40.
3 is capable of exhibiting the function of naturally positioning and holding the magnetic cylinders 40 and 41 on the outer periphery of the sleeve member 15 at appropriate positions in the axial direction by their respective elastic forces. . and,
Such a configuration not only prevents problems such as vibration of the magnetic cylinders 40 and 41 loosely fitted into the sleeve member 15 due to the reciprocating motion of the plunger 16, but also , problems such as deformation of the sleeve member 15 due to the magnetic cylinders 40 and 41 can be prevented, and there are also advantages such as improving the slidability of the plunger 16.

Furthermore, as shown in FIG. 1b or FIG. 2, the magnetic cylinders 40 and 41 made of the above-mentioned winding butts, split butts, etc. can be formed by simply forming a curved magnetic plate material, so that the processing is easy. It is extremely easy to perform, and even if there is a slight gap, there is no problem with its operation, so it is possible to reduce the precision, which greatly improves assembly efficiency and significantly reduces costs. It is.

Note that in the above-described configuration, the magnetic cylinder 40,
41, the housing body 11 and the lid body 12 that hold both ends of the sleeve member 15.
By fitting the housing body 11 and the lid body 12 so that there is a gap between the cylindrical parts 11a and 12a, deviations in concentricity and parallelism between the housing body 11 and the lid body 12 can be absorbed. Member 15
This makes it possible to prevent the plunger 16 from becoming stuck due to deformation.

In addition, 45 in the figure indicates the housing body 11 and the lid body 1.
A lead wire 47 from the excitation coil 30 and the like is drawn out from a part of the joint between the housing 11 and the lid 12 through a grommet 46.
This is a gasket for sealing between the electromagnetic pump 10 and the electromagnetic pump 10. The other components and the operation of the electromagnetic pump 10 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, the shape of the magnetic cylindrical body can be changed as appropriate using a winding bushing or a split bushing, and furthermore, the shape and arrangement position of the sealing materials 42; 43, 44 can also be changed as appropriate.

Further, the electromagnetic pump 1 having the above-described embodiment structure
0, in addition to the magnetic cylinders 40 and 41 formed by winding bushings or split bushings, magnetic discs or the like may be arranged on both ends of the coil bobbin 31, and this makes it possible to drive the plunger 16. This makes it possible to further improve the magnetic efficiency.

[Effect of idea]

As explained above, according to the electromagnetic pump according to the present invention, the sleeve member housing the plunger,
A coil bobbin for winding an excitation coil arranged around the coil bobbin, and a winding bush or a split sleeve, which are fitted from both ends in the axial direction between the outer circumference of the sleeve member and the inner circumference of the coil bobbin. a cup-shaped housing made of a magnetic plate material having a pair of magnetic cylinders forming a magnetic flux path from an excitation coil, and a holding part holding both ends of the sleeve member and the outer end of each magnetic cylinder fitted thereto; Equipped with a pump housing for accommodating pump components consisting of a lid which is fixed by caulking so as to close the opening end, and a cylindrical sealing material is fitted between the magnetic cylinders on both ends of the sleeve member at the center of the outer periphery. An annular sealing material is interposed between the inner passage of the sleeve member and the pump housing inner space at least at one end of the sleeve member. Since it is interposed between the outer end and the outer end, there is no need for precision machining of the pump housing, magnetic cylinder, etc., and the machining and assembly work can be greatly simplified compared to conventional methods. In addition to significantly reducing costs, it is possible to ensure sealing between the fluid passage section and the electrical chamber section by simply providing a simple sealing material in each required part, and it is possible to ensure that the pump operation is not necessary. It has various excellent practical effects, such as being able to fully exhibit it.

In particular, according to the present invention, in the above-described sealing material for sealing between the sleeve member and the pump housing, the sealing material is fitted at the center of the outer peripheral part of the sleeve member and interposed between the magnetic cylinders and at the outer end of at least one of the magnetic cylinders. By skillfully utilizing the elastic force of the sealing material, it is possible to position and hold each magnetic cylinder on the outer periphery of the sleeve member at an appropriate position in the axial direction. This not only prevents problems such as vibration of the magnetic cylinder simply fitted to the outer periphery of the member due to the reciprocating motion of the plunger, but also prevents roughness in machining and assembly accuracy in the axial direction. Even when using a simple pump housing consisting of a magnetic cylindrical or cup-shaped housing and a lid that is caulked and fixed to the open end of the housing, there is no problem in pump operation, and workability and assembly are improved compared to conventional pump housings. It has the advantage that it can be significantly improved.

[Brief explanation of the drawing]

The figure shows an embodiment of the electromagnetic pump according to the present invention, and FIGS. 1a and 1b are a longitudinal side view showing the general structure of the electromagnetic pump as a whole, and a perspective view showing an example of the magnetic cylinder that characterizes the pump. FIG. 2 is a perspective view showing an example of the magnetic cylinder in the form of a wound bushing, and FIG. 2 is a perspective view showing a modification of the magnetic cylinder in the form of a split sleeve. DESCRIPTION OF SYMBOLS 10... Electromagnetic pump, 11... Cup-shaped housing body, 12... Lid body, 13, 14... Pipe body (fluid outlet, inlet), 15... Non-magnetic sleeve member, 16... Plunger, 17... Return spring, 18...Suction valve, 19...Discharge valve, 3
0... Excitation coil, 31... Coil bobbin, 4
0,41... Magnetic cylinder (rolled bushing or split bushing), 42... Cylindrical sealing material, 43,44
...Annular sealing material, 45...Lead wire, 46...
Grommet, 47...Gasket.

Claims (1)

[Scope of utility model registration request] The sleeve member is composed of a sleeve member housing a plunger, a coil bobbin arranged around the sleeve member and around which an excitation coil is wound, and a winding bush or split sleeve formed by curving a magnetic plate material. a pair of magnetic cylinders that are fitted between the outer peripheral part of the member and the inner peripheral part of the coil bobbin at both ends in the axial direction to form a magnetic flux path from the excitation coil; and both ends of the sleeve member. and a cup-shaped housing formed of a magnetic plate material so as to have a holding part that holds the outer end of each magnetic cylinder fitted therein, and a lid body which is caulked and fixed to close the open end of the cup-shaped housing. a pump housing for accommodating pump components, and a cylindrical sealing material is fitted and interposed between the magnetic cylindrical bodies fitted at both ends of the sleeve member at the center of the outer periphery thereof;
An annular sealing material that seals between the internal passageway and the internal space of the pump housing at at least one end of the sleeve member is magnetically held within a holding part on the pump housing side that holds the end of the sleeve member. An electromagnetic pump characterized by being interposed between the outer end of the cylinder and the outer end of the cylinder.