JPH0220472Y2 - - 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. have a simple structure, do not require precision machining of each part, are easy to assemble, and can perform stable pump operation. desired. 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:
A sleeve member containing a plunger is disposed within a cylindrical housing, and a suction chamber and a discharge chamber are formed at both ends of the sleeve member, and an electric chamber in which an excitation coil, a transistor, and a printed circuit board are arranged is formed in the center of the sleeve member. A so-called cylindrical type is generally well known. Also,
As shown in Japanese Patent Publication No. 56-42755 and Japanese Utility Model Publication No. 57-50542, housings with a substantially U-shaped cross section are designed to simplify the structure compared to the cylindrical type. A so-called rectangular type pump housing is also known, in which a sleeve member housing a plunger is inserted through a pump housing made of a combination of members, and an excitation coil and the like are accommodated within the housing.

[The problem that the idea attempts to solve]

However, according to the conventional rectangular type electromagnetic pump described above, the number of components in each part is still large due to the pump housing structure and mounting parts such as screws and rivets. This not only poses problems in terms of performance, but also imposes many restrictions on how to make the entire pump smaller, lighter, and lower in cost.

For example, in a pump with a conventional structure, the transistor installed in the electrical chamber in the pump housing is usually fixed to a heat sink with screws or rivets through insulating mica, and then attached to a printed circuit board or other It is fixed to the yoke member etc. with rivets, etc., and not only does it require mounting parts such as screws, but also tedious assembly work such as tightening the screws is required, which poses problems in terms of assembly. It was hot. Furthermore, when installing the various electronic components mounted on the printed circuit board mentioned above, it is necessary to insulate the housing from other metal components such as the housing due to constraints on the storage space within the pump housing. It is necessary to take countermeasures, and moreover, sufficient care must be taken to prevent shoots from occurring during assembly, which is a major problem in terms of assembly workability.

Such insulation measures include applying an insulating coating to the joints of the pump housing,
A method of filling the housing with an insulating foam material, etc. has also been adopted, but this process is cumbersome. In particular, when the pump housing has many component parts and many joints that require waterproofness, applying the insulating coating material can be quite troublesome.
Moreover, it takes time to dry after coating, which is a problem in terms of production efficiency. Further, there were also drawbacks such as the need to be careful not to allow the coating material mentioned above to penetrate into the inside of the pump housing and adversely affect internal electrical components. On the other hand, the method of filling foam material into the housing requires a quick filling process, which is not only cumbersome, but also requires troublesome work such as removing foam material that protrudes from gaps that occur at the housing joints. Moreover, there were also problems in terms of assembly workability, such as the need for foaming after filling, which took a long time.

Furthermore, fastening parts such as screws are generally used to mount the above-mentioned printed circuit board within the housing, which also poses problems in terms of assembly. Furthermore, with a mounting structure that uses such screws, there is a risk that damage may occur if excessive stress is applied to each part during installation, so sufficient care must be taken. .

In particular, in recent years, this type of electromagnetic pump has come to be installed in light vehicles, etc., so it is necessary to simplify the pump structure, improve assembly ease, and make the pump smaller, lighter, and lower in cost. However, it is difficult to satisfy such a requirement with the current type described above, and it is desired that some kind of countermeasure be taken.

In view of the above-mentioned circumstances, the present invention was developed by reviewing the entire pump structure, simplifying the structure of each part including the pump housing, omitting mounting parts such as screws and rivets, and making it easier to connect parts to each other. This eliminates assembly and fixing work, and improves the workability and assemblability of each part. In particular, it simplifies the assembly and fixation structure of transistors and their heat sinks and printed circuit boards, and improves the efficiency of electronic components on printed circuit boards. The purpose of the present invention is to provide an electromagnetic pump that is capable of reducing the size, weight, and cost of the pump as a whole, while also taking measures against such problems.

[Means to solve the problem]

In order to meet the above-mentioned demands, an electromagnetic pump according to the present invention includes a resin coil bobbin disposed around a sleeve member housing a plunger and having a plurality of studs on the outer surface of the flange;
Transistors and their heat sinks are laminated on the outer surface of one flange of this coil bobbin at predetermined intervals by the studs, and a printed circuit is laminated in a direction perpendicular to the surface of these transistors and the heat sink, and various electronic components are incorporated therein. A substrate and
The printed circuit boards are laminated in a direction perpendicular to the board surface, and a holder that holds the printed circuit board at a predetermined distance from the inner surface by means of a plurality of studs erected on the inner surface thereof is sequentially combined and laminated. The pump is housed in the cup-shaped housing main body in a state in which it is biased toward the lid body for closing the main body opening end via the holder by a leaf spring interposed between the cup-shaped housing body and the bottom side. It was designed so that

[Effect]

According to the present invention, a stacked body including a holder, a printed circuit board, a heat sink, a transistor, and a coil bobbin is accommodated together with a sleeve member with a leaf spring interposed between the bottom side of the housing body and the cover. By assembling the bodies, the pump components can be housed and held within the pump housing.

〔Example〕

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

FIGS. 1 to 3 show an embodiment of the electromagnetic pump according to the present invention. In these figures, first, the schematic structure of the electromagnetic pump, which is generally designated by the reference numeral 10, will be briefly explained using FIG. To explain, 11
12 is a cup-shaped housing body constituting the pump housing, and 12 is a disc-shaped lid body that closes the open end of the housing body.The center of the bottom of the housing body 11 and the center of the lid body 12 respectively bulge outward. Cylindrical portions 11a and 12a are integrally formed, and a fluid outlet is provided at the center of these cylindrical portions 11a and 12a.
Pipe bodies 13 and 14 constituting the fluid inlet are each fixed by brazing or the like. The housing main body 11 and the lid body 12 are easily formed from a metal plate material by pressing, etc., and the housing main body 11 and the lid body 12 are
The opening edge 11b on the first side is caulked as shown in FIG. 2 to integrally assemble the opening edge 11b. Here, the housing body 1 that constitutes these pump housings is
1 and the lid 12 also function as a yoke that forms a magnetic flux path from an excitation coil, which will be described later, and the internal space thereof serves as a housing space in which mechanical and electrical basic parts of the pump are arranged. Furthermore, 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 numeral 15 denotes a non-magnetic sleeve member interposed between the housing main body 11 and the cylindrical portions 11a and 12a of the lid body 12 constituting the pump housing. A return spring 17 that is slidably housed and normally disposed on the fluid inlet side applies a biasing force toward the fluid outlet side. In addition, in the figure, 18 is a suction valve attached to the inlet side end of the three-piece member 15, 19 is a discharge valve provided at the outlet side end of the plunger 16, and the valve body 19a constituting this discharge valve 19 is as follows: It 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 of the plunger 16. That is, this ring-shaped member 20 is connected to the valve body 19a of the above-mentioned discharge valve 19.
At the tip of the cylindrical portion 20a on the fluid outlet side, there is a fluid outlet which extends a predetermined length inside the end of the sleeve member 15 on the fluid outlet side. A valve seat 21 made of rubber or synthetic resin is provided to open and close the inner end of the pipe body 13. 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 also has a hole 2 for allowing fluid to pass therethrough.
0b is drilled. 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 functions to close and reliably prevent fluid from leaking to the outlet side. Furthermore, in this embodiment, in order to configure the above-mentioned control valve, the inner end 1 of the pipe body 13 on the outlet side
3a is extended within the sleeve member 15 by a predetermined length, and an annular space 23 is formed around the sleeve member 3a to serve as a pulsation absorbing chamber for the fluid on the discharge side.

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 above-mentioned plastic gear 16. ), as is clear from FIG. 1, a transistor 32 and its heat sink 33, which constitute an oscillator for passing an intermittent current to the excitation coil 30, are stacked at predetermined intervals on the outer surface of the flange 31a. A printed circuit board 34 is installed in a direction perpendicular to the planes of the transistors 32 and the heat sink 33, on which various electronic components 34a such as resistors and diodes, which constitute an oscillator together with the transistor 32 described above, are attached.
A holder 35 for holding the printed circuit board 34 at a predetermined distance from the bottom of the housing body 11 is arranged in a stacked manner in a direction perpendicular to the surface of the board 34. The stacked body of these pump components is housed in a housing main body 11 constituting the pump housing with the holder 35 side as the tip, and is elastically supported by a leaf spring 36 interposed on the bottom side of the main body 11. In this state, the cover body 12 is clamped and held between the cover body 12 which is assembled and fixed to the main body 11 by caulking or the like.

That is, according to this embodiment, the transistor 32 and the printed circuit board 34, which have been problems in the past, can be solved.
etc., can be easily assembled without using screws, etc., and measures against shortening of the electronic components 34a, etc. on the printed circuit board 34 can be taken by improving the holding structure of the printed circuit board 34, etc. In addition, the pump housing structure has been improved, reducing the overall number of parts and simplifying the configuration of each part. Furthermore, according to this embodiment, the above-mentioned transistor 32, printed circuit board 34, and other electric chamber components can be arranged by skillfully utilizing the space formed above the coil bobbin 31 (which normally tends to become a dead space). Compared to square pumps, the entire pump is smaller and lighter.

Here, on the outer surface of the flange 31a on the bottom side of the housing body 11 of the coil bobbin 31, the transistor 32 and the heat sink 33 are engaged and supported at a predetermined interval, and a printed circuit board 34
A plurality of studs 37 are integrally provided to support the bobbin 31, and a plurality of studs 38 are provided on the inner surface of the holder 36, which is arranged opposite to the bobbin 31. ,
The holders 36 are erected so as to be supported at a predetermined interval. In addition, 37a in the figure is a small diameter part at the tip of the stud 37, and this small diameter part 37a is the hole part 32a, 33a drilled in the transistor 32, the heat sink 33, and the printed circuit board 34;
By being fitted into the holder 34b, it is possible to support the holder 34b while restricting its movement in the surface direction.
By fitting into a hole 38a formed in the stud 38 on the 5 side, these laminates are sandwiched and held between the studs 37 and 38 to be integrated. Furthermore, 35a in the figure is a cylindrical portion erected at the center of the holder 35.

Further, in this embodiment, the printed circuit board 34 and the holder 35 are formed to have a substantially ring shape in accordance with the coil bobbin 31, and the heat dissipation plate 3
3 is a transistor 3 for a printed circuit board 34.
2 is shown in the case where it is formed into a fan-like shape so that it has a size and shape that can be attached to it.

According to the above-described configuration, the flange 31 on the bottom side of the housing body 11 of the coil bobbin 31
As shown in FIG. 1, the transistor 32 and the heat sink 3
3. Assemble the printed circuit board 34 and the holder 35 one after another, sandwich and hold them with the above-mentioned studs 37 and 38 ensuring a space between each member, and pass the sleeve member 15 through its center. The housing body 11 is stacked with the plate spring 36 interposed at the bottom of the housing body 11, and the lid body 12 is placed thereon, and the opening side edge 11b of the housing body 11 is caulked to close the lid body 12. Due to the simple structure of integrating the pump with the pump and assembling the entire pump, the pump housing structure and assembly structure of each part can be simplified compared to conventional pumps, and as a result, the ease of assembly can be improved. In addition, in the above-mentioned assembled state, as shown in FIG.
The stacked body is accommodated and held in the pump housing in a state where it is biased toward the lid body 12 by a leaf spring 36 interposed between the housing body 11 and the holder 35 on the bottom side.

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.
By using a housing consisting of 2 and accommodating each component in a simple stacked state, the housing structure is simplified, and
By eliminating parts such as screws and reducing the number of fixing points between parts, the workability of each component is improved and assembly work can be performed more easily.

In particular, according to the electromagnetic pump 10 assembled with such a configuration, the fixing force of each component within the pump housing is obtained by the biasing force of the leaf spring 36, so the spring strength can be freely adjusted. There is no local excessive stress applied to each component, and no machining precision is required for each component. This prevents deformation and cracking, unlike conventional methods, and improves reliability during assembly. It has the advantage that it can be improved.

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 an engaging part between the coil bobbin 31 and the lid body 12 to prevent rotation. This can be done by setting up a Furthermore, in the pump structure described above, in order to more appropriately dissipate heat from the transistor 32,
It is preferable that the heat sink 33 is brought into contact with the inner wall 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 the magnetic cylinders 40 and 41 are made of, for example, a rolled bush or a split bush made by curving a plate material, the molding process becomes simple.

Furthermore, in the figure, 42, 43, 44 are sealing materials for sealing between the inside of the sleeve member 15 and the pump housing internal space, and 45 is a part of the joint between the housing body 11 and the lid body 12. 47 is a gasket for sealing between the housing body 11 and the lid body 12, and the other components and the electromagnetic pump 10 are As for the operation etc., it is well known.
The 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.

[Effect of idea]

As explained above, according to the electromagnetic pump according to the present invention, the pump housing is constituted by a housing body having a substantially cup shape and a lid body that closes the open end of the housing body, and the pump components are simply placed inside the housing body. Because they are housed in a stacked state and held elastically by the biasing force of leaf springs, the pump housing structure and the connection structure between each component are simplified compared to conventional pump structures, and screws, etc. Because these parts can be omitted, it is possible to create a configuration that does not require machining precision for each part, and since screws, etc. are omitted, and there are fewer places to fix parts to each other, assembly work can be performed extremely easily, and costs can be significantly reduced. The practical effects of this approach are significant.

In particular, according to the present invention, since the pump components housed in the pump housing are assembled by simply stacking them, the conventional screw connections are omitted and the number of connections by caulking etc. is minimized. In addition to reducing the number of parts and assembly man-hours, there is no risk of deformation due to over-tightening or over-caulking of screws, etc., thereby preventing pellet cracking due to deformation of the transistor heat sink, and further improving the quality of the printed circuit board. It is possible to eliminate problems such as cracks, cutting of wiring patterns, and solder adhering to screws, etc., which causes shoots.

[Brief explanation of drawings]

The figures show an embodiment of the electromagnetic pump according to the present invention, in which Fig. 1 is a schematic exploded perspective view of pump components housed in a stacked state in a pump housing, which is the main part, and Fig. 2 is an exploded perspective view. FIG. 3 is a longitudinal sectional side view showing the assembled state of the entire electromagnetic pump, and FIG. 3 is a schematic perspective view showing the external appearance of the electromagnetic pump. 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, 31... Coil bobbin, 31a...
Flange, 32... Transistor, 33... Heat sink, 34... Printed circuit board, 34a... Electronic component, 35... Holder, 36... Leaf spring, 37,
38... Stud, 40, 41... Magnetic cylinder, 4
2, 43, 44... Seal material, 45... Lead wire, 46... Grommet, 47... Gasket.

Claims (1)

[Scope of utility model registration request] It consists of a cup-shaped housing body having a fluid outlet and a lid body assembled to close the open end thereof and having a fluid inlet, and includes a sleeve member that accommodates a plunger that is disposed astride between the fluid outlet and the inlet. A pump housing that forms a housing space for pump components; a resin coil bobbin disposed within the pump housing at a portion of the outer periphery of the sleeve member near the lid body; Transistors and their heat sinks stacked at intervals; a printed circuit board in which various electronic components are stacked in a direction perpendicular to the planes of these transistors and heat sinks; a holder that is stacked in a direction and holds the substrate at a predetermined distance from the bottom side of the housing body; and a leaf spring that is interposed between the holder and the bottom side of the housing body on the outer surface side of the holder. A plurality of studs are integrally provided on the outer surface of the flange on the housing body side of the coil bobbin and the inner surface of the holder opposite thereto, and the transistor and its heat sink are laminated thereon by the studs. The printed circuit boards are arranged in a stacked manner sandwiched between the outer surface of the flange on the housing body side of the coil bobbin and the inner surface of the holder at a predetermined interval, respectively, and the outer surface of the holder. The pump housing is housed in the housing main body with the leaf spring interposed on the side thereof, and the lid body is assembled and fixed to the open end of the housing main body, so that the pump housing is An electromagnetic pump characterized by being held within.