JP3069253B2 - Electromagnetic pump with oil level sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pump having an oil level sensor for detecting the level of fuel oil stored in a fuel tank.

[0002]

2. Description of the Related Art An electromagnetic pump as shown in FIG. 6 is conventionally known. The electromagnetic pump 10 is for drawing out a liquid fuel F in a fuel tank T attached to a stove or the like to a combustion chamber of a stove or the like at a predetermined constant flow rate. An electromagnetic coil 12 provided around the pump body 11; a terminal plate 13 for relaying power supply to the electromagnetic coil 12;
Has a basic configuration including a yoke 14 made of a U-shaped magnetic member forming an annular magnetic path.

The pump body 11 has a pump section 11a having a cylinder (not shown) as a main component therein, and a pump section 11a connected to a lower portion of the pump section 11a.
And a fuel suction portion 11b inserted into the fuel tank T in a state of being immersed in the fuel tank T. The pump section 11a has a plunger (not shown) which is provided so as to be vertically movable. A fuel inlet 15 is opened at the lower end of the fuel inlet 11b, and a fuel outlet 16 is formed at the upper end of the pump body 11.

The electromagnetic coil 12 is wound around a bobbin 17 fitted on the outer periphery of the pump portion 11a.
From the lead wire J connected to the connection member 131 of the terminal plate 13 formed on the upper flange portion on the bobbin 17, a connector J1 is connected.
The pulse-like drive signal supplied via the connection member 13
1 to be excited. Then, the plunger is urged upward by the generated magnetic flux, and is returned downward by the coil spring. As the plunger reciprocates up and down, the liquid fuel F in the fuel tank T is discharged from the fuel inlet 1.
5, is introduced into the pump body 11, and is discharged from a discharge port (not shown) of the fuel discharge section 16 to a combustion chamber such as a stove via a fuel discharge pipe P.

On the other hand, a sensor housing 18 having a hollow inside is provided integrally with a side surface of the fuel suction portion 11b, and an annular float is provided so as to surround the sensor storage portion 18 and the fuel suction portion 11b. 19 are provided. The float 19 floats on the surface of the liquid fuel F in the fuel tank T, and moves up and down according to the oil level.

A proximity sensor 18a for detecting the presence of the float 19 when the float 19 approaches is provided below the inside of the sensor storage portion 18. When the proximity sensor 18a detects the presence of the float 19, A detection signal indicating that the liquid fuel F in the fuel tank T has reached a preset lower limit of the storage amount is output. An electromagnetic pump provided with such an oil level sensor is described, for example, in Japanese Patent Publication No. Hei 3-25694.

[0007]

By the way, in the conventional electromagnetic pump 10 as described above, the proximity sensor 18a forming a part of the oil level sensor is provided integrally with the fuel suction portion 11b. Since the interior of the storage unit 18 is not easily detachable, when the proximity sensor 18a fails, it is extremely difficult to replace only the proximity sensor 18a, even though the other parts are normal. In addition, the electromagnetic pump 10 itself has to be replaced with a new one, resulting in a problem that maintenance cost is increased. Conversely, when the electromagnetic pump 10 breaks down, the electromagnetic pump 10 must be replaced including the proximity sensor 18a even if the proximity sensor 18a is normal, which has the same problem as described above.

Therefore, as described in Japanese Patent Application Laid-Open No. 6-295532, it is conceivable to attach the oil level sensor to the fuel tank T as a separate body independent of the electromagnetic pump. A mounting hole for separately mounting the oil level sensor must be formed in the tank T, and therefore, there is a problem that the manufacturing cost of the fuel tank T increases.

[0009] In addition, when the oil level sensor is separated from the electromagnetic pump, the mounting position of the electromagnetic pump and the mounting position of the oil level sensor are separated from each other. The liquid fuel F in the portion where the surface sensor is provided and the portion where the electromagnetic pump is provided
There is a problem that a difference occurs in the surface height of the liquid fuel, and as a result, the oil level of the liquid fuel in the portion where the electromagnetic pump is provided cannot be accurately detected.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the oil level sensor can be easily replaced, the oil level can always be detected reliably, and the maintenance cost can be reduced. It is an object of the present invention to provide an electromagnetic pump having an oil level sensor that can be reduced.

[0011]

According to a first aspect of the present invention, there is provided an electromagnetic pump having an oil level sensor, comprising: a pump section having a fuel suction section inserted into a fuel tank; An electromagnetic pump having a sensor unit for detecting a position of an oil level with respect to a part, wherein the sensor part is detachably attached to a mounting hole formed in a fuel tank and the pump part is detachable. inserting the fuel intake unit for attaching the mounting hole is constituted by a flange member which is bored, and attached to the oil level sensor along with the fuel inlet portion to the lower portion of the flange member, the furan
The jig member is inserted into the fuel tank at its lower part, and
A cylindrical casing through which fuel can flow is provided.
The oil level sensor in the casing.
It is decorated by being protruded from the inner wall and
The fuel suction unit is configured to be fitted therein .

[0012] Electromagnetic pumps with oil level sensor according to claim 2 of the present invention, in the electromagnetic pump having an oil level sensor of claim 1 Symbol placement, the oil level sensor, a refractive index equal to the liquid fuel And a light-emitting unit that projects light toward the prism and a light-receiving unit that receives light reflected by the prism.

[0013]

According to the electromagnetic pump having the oil level sensor according to the first aspect of the present invention, the sensor part of the electromagnetic pump is mounted on the fuel tank by attaching the flange member to the fuel tank. Since the sensor section is provided with an oil level sensor, the position of the oil level in the fuel tank can be detected independently of the pump section of the electromagnetic pump with the sensor section attached to the fuel tank. Will be possible.

The electromagnetic pump provided with the oil level sensor is mounted on the fuel tank by attaching the pump section to the sensor section by using a mounting structure of the pump section which is detachable from the flange member. State.

[0015] By interior the oil level sensor in the casing, the oil level sensor is protected by the casing. If a fine mesh is provided in the casing, foreign matter is prevented from being mixed into the casing, so that the sensor is not contaminated by the foreign matter.

According to the electromagnetic pump having the oil level sensor according to the second aspect, the oil level sensor emits light toward the prism formed of a material having a refractive index equal to that of the liquid fuel. Since it is composed of a light emitting unit and a light receiving unit that receives light reflected by the prism, when the prism is immersed in the liquid fuel, light emitted from the light emitting unit toward the prism passes through the prism. When the prism is not immersed in the liquid fuel, the light emitted from the light emitting unit is reflected by the prism.
Therefore, if a light receiving portion is provided on the side where light is reflected by the prism, the absence of liquid fuel is detected when the light receiving portion receives light, and the presence of liquid fuel is detected when the light receiving portion does not receive light. .

[0017]

1 is a partially cutaway perspective view showing a first embodiment of an electromagnetic pump according to the present invention, and shows a state in which the electromagnetic pump is mounted on a fuel tank. FIG. 2 is a cross-sectional view of the electromagnetic pump of FIG. The electromagnetic pump 1 suctions and discharges the liquid fuel F in the fuel tank T,
It has a basic configuration including a sensor unit detachably attached to the pump unit. The pump section includes a cylindrical pump body 2, an electromagnetic coil section 3 provided around a cylinder 21 of the pump body 2, and a yoke 4 made of a magnetic member constituting a part of an annular magnetic path of the electromagnetic coil section 3. A terminal portion 5 extending from an upper end flange portion of the coil bobbin 31 of the electromagnetic coil portion 3 and a connecting portion 6 connecting a fuel outlet pipe P connected to an upper portion of the pump body 2 to the pump body 2. .

An upper end of the pump body 2 is externally fitted and fixed to a lower end of the cylinder 21, and a lower end is immersed in a liquid fuel F filled in a fuel tank T. Is provided. The lower end surface of the fuel suction portion 2a is provided with a fuel suction port 2b in which a mesh member is stretched. Further, a fuel discharge section 8 is provided at an upper portion of the cylinder 21.

The yoke 4 is provided substantially at the center of the pump body 2 and is a pair of upper and lower horizontal plates 4 which are parallel to each other.
As shown in FIG. 2, through holes are formed in the center portions of the upper and lower horizontal plate portions 41 and 42. The vertical plate portions 43 are formed on one side surface. The cylinder 21 is inserted through the through hole.

The inner diameter of the through holes of the upper and lower horizontal plate portions 41 and 42 is set slightly larger than the outer diameter of the cylinder 21, and the clearance between the through hole of the lower horizontal plate portion 42 and the outer peripheral surface of the cylinder 21 is set. A cylindrical lower magnetic body 92 is fitted into the gap between the through hole of the upper horizontal plate portion 41 and the outer peripheral surface of the cylinder 21 at a predetermined distance from each other.

A flange portion 92a is provided below the lower magnetic body 92, and the fuel suction portion 2a is attached to the lower horizontal plate portion 42 of the yoke 4 in a state where the flange portion 92a is fitted over the fuel suction portion 2a. It is tightly fixed. An annular seal member 92b is provided at a lower end portion of the flange portion 92a so as to seal a gap between a lower end surface of the lower magnetic body 92, an outer peripheral surface of the cylinder 21, and an inner peripheral surface of the fuel suction portion.

On the other hand, an annular flange portion 91a projecting in the radial direction is also provided on the upper portion of the upper magnetic body 91, and the upper magnetic body 91 is fitted into the through hole of the upper horizontal plate portion 41, and the flange portion 91a is fitted to the flange portion 91a. Are locked to the inner peripheral edge of the through hole of the upper horizontal plate portion 41. In this state, the fuel discharge portion 8 is screwed and fastened to a male screw threaded on the upper portion of the cylinder 21, so that the yoke 4 and the upper magnetic body 91 are formed on the bottom surface of the fuel discharge portion 8 via the flange portion 91a. Are fixed in contact with each other.

Inside the cylinder 21, liquid fuel F
Plunger 22 for sucking the fluid into the pump body 2 is provided so as to be slidable in the vertical direction.
Numeral 2 is stationary at positions where the vertical urging forces are balanced by coil springs 23 and 24 provided inside the upper and lower sides of the cylinder 21. Inside the plunger 22, a check valve 25 for suction made of a ball body and a lower valve spring 26 for urging the check valve 25 for suction toward a closing side which is a suction side are installed.

A discharge check valve 28 is provided above the upper coil spring 23, and an upper valve spring 29 for urging the discharge check valve 28 toward the closing side, which is the plunger 22 side, is provided above the discharge check valve 28. Is provided.

The electromagnetic coil section 3 is a cylindrical body which is externally fitted to the upper magnetic body 91 and the lower magnetic body 92 while being sandwiched between the horizontal plate sections 41 and 42 of the yoke 4, and is vertically Non-magnetic bobbin 31 having flange 31b and lower flange 31a, and electromagnetic coil 32 wound around its cylindrical body
It has. A terminal 5 extends from one end of the upper flange 31b. The terminal 5 has an electromagnetic coil 3
2 is connected to a lead J for supplying a pulse-like drive signal.

The terminal 5 is provided with a fixed resistor R, and the current supplied from the lead wire J is supplied to the electromagnetic coil 32 through the fixed resistor R. By replacing the fixed resistor R and selecting various resistance values, the amplitude of the reciprocating vertical movement of the plunger 22 can be changed, and the discharge amount of the liquid fuel F can be finely adjusted to match the design value. ing.

In the above configuration, when the electromagnetic coil 32 is excited by the pulse drive signal to generate a magnetic flux, the plunger 22 receives a magnetic attraction force and the upper coil spring 23
The liquid fuel F in the fuel tank T is sucked from the fuel suction port 2b and discharged from the fuel discharge port 61 at this time. On the other hand, when the magnetic attraction force disappears during the pulse pause period, the plunger 22 is pushed down by the repulsive force of the upper coil spring 23, and when the plunger 22 descends, the liquid fuel F in the fuel suction portion 2a is discharged by the suction check valve 25. Is introduced above the installation section. By repeating this operation, a fixed amount of the liquid fuel F is supplied from the fuel discharge port 61 to a combustion chamber such as a burner.

The sensor section of the present invention comprises a flange member removably attached to a mounting hole T1 formed in the fuel tank T, and an oil level sensor attached to the flange member. The oil level sensor of the present embodiment includes a light emitting element 7a, a light receiving element 7b, and a prism 7c, which will be described later.

Then, in the first embodiment of the present invention,
As shown in FIGS. 1 to 3, a casing 7 for accommodating the fuel suction portion 2 a of the pump body 2 is provided. The casing 7 includes a cylindrical casing main body 71 in which a housing chamber 71 a for housing the fuel suction section 2 a is formed, a flange portion (flange member) 72 formed on an upper edge of the casing main body 71, It comprises a sensor storage tube 73 protruding from the inner wall surface of the casing body 71. The sensor storage tube 73 is provided along the inner wall surface of the casing body 71, has an opening at the upper end, and has an element storage chamber 73a for inserting the light emitting element 7a and the light receiving element 7b therein. Have been.

The inner diameter of the casing body 71 is set to be larger than the outer diameter of the fuel suction portion 2a. The fuel suction portion 2a is accommodated in the accommodation chamber 71a in a state of slidingly contacting the outer peripheral surface of the sensor storage cylinder 73 and the inner peripheral surface of the casing body 71 facing the outer peripheral surface. The vertical dimension of the fuel suction section 2a is
The fuel suction portion 2a is set to be slightly shorter than the vertical dimension of a, so that the upper surface of the flange portion 72 and the bottom surface of the lower horizontal plate portion 42 of the yoke 4 come into contact with each other when the fuel suction portion 2a is housed in the housing chamber 71a. Has become.

The outer diameter of the casing body 71 is
When the casing body 71 is inserted into the fuel tank T through the mounting hole T1 and is dimensioned smaller than the inner diameter of the mounting hole T1 formed in the fuel tank T, the flange portion 7
2 abuts on the periphery of the mounting hole T1.
Then, the casing body 71 is inserted into the mounting hole T1,
A screw hole 420 (FIG. 3) drilled in the lower horizontal plate portion 42 and a screw hole drilled in the flange portion 72 in a state where the fuel suction portion 2a is loaded in the storage chamber 71a of the casing body 71. By screwing the screw B through 720 and screwing it into a screw hole (not shown) provided in the fuel tank T, the electromagnetic pump 1 having the casing 7 is mounted on the fuel tank T.

In this embodiment, the screw B, the screw hole 420 formed in the lower horizontal plate 42, and the flange 72
A mounting structure for fixing the electromagnetic pump to the fuel tank is constituted by screw holes 720 formed in the fuel tank T and screw holes (not shown) screwed into the fuel tank T. In this embodiment, the yoke 4 and the flange 72 are simultaneously attached to the fuel tank T by the same screw B as described above, but only the flange 72 is attached to the fuel tank T with another screw. And separate flange 7
The lower horizontal plate portion 42 of the yoke 4 may be attached to the second yoke 2. Further, the mounting structure according to the present invention is not limited to the screw B or the like, but may employ a screw-in method or the like.

On the peripheral surface of the casing body 71, FIG.
As shown in FIG. 7, a plurality of longitudinally extending side oil passage windows 71b are opened, and a bottom oil passage window 71c is opened on the bottom surface of the casing body 71.
Filter materials 71d and 7d of fine mesh for filtering foreign matter are stretched over b and 71c. Accordingly, the casing body 71d is provided via the filter materials 71d and 7d.
The liquid fuel F can flow between the inside of the storage chamber 71a and the inside of the fuel tank T.

At the lower end of the sensor housing 73, there is provided a prism 7c projecting downward. The installation level of the prism 7c is set so as to correspond to the lowest minimum height of the liquid fuel F stored in the fuel tank T. Therefore, when the liquid fuel F having a height equal to or higher than the minimum lower limit is stored in the fuel tank T, the prism 7c is immersed in the liquid fuel F, and the oil level is reduced to the lower limit or lower. Then, the prism 7c is exposed to the air.

The prism 7c is formed in an inverted right triangular shape in a sectional view. The light-emitting element 7a and the light-receiving element 7b are arranged to be directed downward above both sides of the right-angled triangle of the prism 7c. And
From the light emitting element 7a, the position of the light emitting element 7a is set so as to be projected at one incident side of the prism 7c at an incident angle of 45 °, and the reflected light from the other oblique side of the prism 7c is input. The light receiving element 7b is provided at the position where the light is to be emitted.

Further, the prism 7c is formed of a material having a refractive index equal to that of the liquid fuel F stored in the fuel tank T. In the present embodiment, since the casing 7 itself is manufactured by injection molding using a transparent synthetic resin having a refractive index equal to the refractive index of the liquid fuel F, the prism 7c naturally has the refractive index of the liquid fuel F. They have the same refractive index.

Accordingly, the housing chamber 71a of the casing body 71
When the liquid fuel F enters only within the lower limit value, the light emitting element 7a as shown by a solid line arrow in FIG.
Is reflected at one oblique side of the prism 7c at right angles and reaches the other oblique side, where it is again reflected at right angles, reaches the light receiving element 7b and is received. If an out-of-fuel warning is output according to this light receiving signal, the out-of-fuel condition in the fuel tank T can be easily recognized.

Conversely, when the liquid fuel F has a storage level equal to or higher than the lower limit, the prism 7c is immersed in the liquid fuel F, and the refractive index of the prism 7c is equal to the refractive index of the liquid fuel F. Since the rate is the same, the light emitted from the light emitting element 7a goes straight as indicated by the dashed line arrow without being reflected at the oblique side of the prism 7c. Therefore, it does not reach the light receiving element 7b.

The above-mentioned flange portion 72 has an element storage chamber 73.
terminal member 7 having an L-shaped side view in a state of closing the opening above
4 is provided on the upper surface of the terminal member 74.
5 are erected. The connection terminal 75 has a prism 7
A lead wire 76 extending upward from c is connected. Therefore, by connecting a connector (not shown) to the connection terminal 75, the detection signal output from the light receiving element 7b can be input to a predetermined external control device.

In the above embodiment, the oil level sensor is constituted by the light emitting / receiving elements 7a and 7b and the prism 7c. However, the oil level sensor applied to the present invention has the above optical principle. However, the present invention is not limited to the application of the sensor, and a sensor using a float or the like, or an electric or magnetic sensor using a property difference between air and oil may be used. Further, sensors based on the presence / absence of oil level reflection of ultrasonic pulses, various contact-type and proximity-type sensors are applicable.

FIG. 3 is a perspective view showing a state where the pump section of the electromagnetic pump of the first embodiment is separated from the casing. As shown in this figure, the electromagnetic pump 1 and the casing 7 can be separated. Therefore, by loosening the screw B and pulling the casing 7 upward, FIG.
The state in which the electromagnetic pump 1 is fixed to the fuel tank T by the screw B is released, and the casing 7 and the electromagnetic pump 1
Can be removed from the fuel tank T, and the electromagnetic pump 1 can be easily separated from the casing 7 by extracting the electromagnetic pump 1 from the casing 7.

Therefore, in this embodiment, when the light-emitting / light-receiving elements 7a and 7b fail, it is troublesome to disassemble the electromagnetic pump and replace the built-in light-emitting / light-receiving element with a new one as in the prior art. It is only necessary to replace the casing 7 with a new one without performing any operation, so that the cost of the replacement work can be greatly reduced.

In the assembling process of the electromagnetic pump 1 as well, the light emitting / receiving elements 7a and 7b have to be assembled inside the pump section of the narrow electromagnetic pump 1 in the past, and an extremely troublesome assembling work is required. However, in the present invention, the casing 7 is manufactured as a separate body from the electromagnetic pump 1, and only the operation of combining the electromagnetic pump 1 and the casing 7 at the final stage of the manufacturing process or when the casing 7 is mounted on the fuel tank T is performed. Thus, since the light emitting / receiving elements 7a and 7b are mounted on the electromagnetic pump 1, the manufacturing cost is extremely reduced.

FIG. 4 is a perspective view showing a second embodiment of the electromagnetic pump provided with the oil level sensor of the present invention, and FIG. 5 is a transverse sectional view thereof. In the case of this embodiment, the structure of the pump section of the electromagnetic pump 1a is the same as that of the first embodiment, but the structure of the sensor section is different from that of the second embodiment. That is, in the second embodiment, the casing is not provided in the sensor portion, and the flange member 7 corresponding to the flange portion 72 is provided.
The oil level sensor is attached so as to extend from the lower part of the flange member 70 along the fuel suction part 2a.

More specifically, the flange member 70 has a rectangular shape in a plan view, and a mounting hole 701 is formed at a substantially central portion thereof, and the fuel suction portion 2a 'of the pump portion is inserted through the mounting hole 701. In this state, the pump body 2 and the flange member 70 are connected to each other. The above-mentioned fuel suction part 2
A flange 2c is provided at a lower portion of the flange 2a, and a cylindrical wire mesh strainer 2d is fitted into the lower portion of the flange 2c to prevent foreign matter from entering the fuel intake portion 2a 'from the fuel intake port 2b. I am trying to do it.

On the other hand, a cylindrical body 702 is suspended from the bottom surface of the flange member 70 in parallel with the fuel suction portion 2a ', and the light emitting / receiving element 7a, 7a, The sensor cylinder 703 loaded with 7b is inserted. An annular seal member 704 is mounted on the outer peripheral surface of the sensor cylinder 703, and the seal member 704 slides on the inner peripheral surface of the cylindrical body 702, so that the liquid fuel F enters the cylindrical body 702. It is to be blocked.

Further, a guide groove 705 extending in the vertical direction is provided on the surface of the sensor cylinder 703, and a large number of locking grooves 706 orthogonal to the guide groove 705 are provided. On the other hand, on the inner peripheral surface of the cylindrical body 702,
A locking projection 707 that is fitted into the guide groove 705 is protruded, and the sensor cylinder 703 can move up and down in a state where the locking projection 707 is fitted into the guide groove 705 of the sensor cylinder 703. Then, by rotating the sensor cylinder 703 around its own axis, the locking projection 707 of the cylindrical body 702 fits into the locking groove 706 of the sensor cylinder 703,
The vertical movement of the sensor tube 703 is restricted.

The sensor cylinder 703 is provided with the liquid fuel F
The prism 7c is made of a transparent synthetic resin having the same refractive index as that of the first embodiment. And at the bottom inside the sensor tube 703,
Light-emitting / light-receiving elements 7a and 7b similar to those of the first embodiment are provided so as to face the prism 7c, and the oil level is detected by the same operation as described above.

Since the electromagnetic pump of the second embodiment is constructed as described above, in addition to the effects of the first embodiment, the prism 7c is adjusted by adjusting the amount of protrusion of the sensor cylinder 703 relative to the cylindrical body 702. Can be changed, and as a result, the lowermost level of the liquid fuel can be appropriately set again, which advantageously expands the applicable range of the electromagnetic pump 1a.

[0050]

According to the electromagnetic pump provided with the oil level sensor according to the first aspect of the present invention, the electromagnetic pump comprises a pump section and a sensor section detachable from the pump section. The part is composed of a flange member detachably attached to a mounting hole drilled in the fuel tank, and an oil level sensor attached to the flange member, so that when the oil level sensor fails, the flange member is replaced. By removing the sensor from the fuel tank and replacing the sensor with a new one, the oil level sensor can be easily replaced without disassembling the electromagnetic pump, and when the electromagnetic pump fails, the normal oil level sensor remains unchanged. It is possible to immediately replace the faulty electromagnetic pump and deal with it, making it extremely quick and easy to respond when the oil level sensor and the electromagnetic pump fail. It is advantageous over the improved maintenance of the throat electromagnetic pump.

Further, unlike the conventional type in which the oil level sensor is provided in the fuel tank independently of the electromagnetic pump, it is not necessary to separately provide a mounting hole for the oil level sensor in the fuel tank. The oil level sensor is set in the fuel tank simply by fitting the flange member into the electromagnetic pump mounting hole and fitting the fuel suction part of the electromagnetic pump into it, and remodeling the fuel tank especially for the oil level sensor There is no need, and the electromagnetic pump can be made versatile to the fuel tank, which is advantageous.

Further , by providing the oil level sensor in the casing, the oil level sensor is protected by the casing when the electromagnetic pump is attached to and detached from the fuel tank, and damage to the oil level sensor can be reliably prevented.

According to the electromagnetic pump having the oil level sensor according to the second aspect of the present invention, the oil level sensor is projected onto a prism formed of a material having a refractive index equal to that of the liquid fuel, and is directed toward the prism. Because it is composed of a light-emitting part that emits light and a light-receiving part that receives light that has passed through the prism, there is no mechanical movable part such as a conventional float-type sensor,
Failure frequency can be reduced.

[Brief description of the drawings]

FIG. 1 is a first view of an electromagnetic pump including an oil level sensor according to the present invention.
It is a partially notched perspective view which shows an Example.

FIG. 2 is a cross-sectional view of the electromagnetic pump of FIG.

FIG. 3 is a perspective view showing a state where a pump section and a casing of the electromagnetic pump shown in FIG. 1 are separated.

FIG. 4 shows a second example of the electromagnetic pump provided with the oil level sensor of the present invention.
It is a perspective view showing an example.

FIG. 5 is a cross-sectional view of the electromagnetic pump of FIG.

FIG. 6 is a partially cutaway side view showing an example of a conventional electromagnetic pump provided with an oil level sensor.

[Explanation of symbols]

 1, 1a Electromagnetic pump 2 Pump body 2a, 2a 'Fuel suction part 21 Cylinder 22 Plunger 23 Upper coil spring 24 Lower coil spring 3 Electromagnetic coil part 31 Coil bobbin 32 Electromagnetic coil 4 Yoke 5 Terminal part 6 Connection part 61 Fuel outlet 7 Casing 7a Light emission Element 7b Light receiving element 7c Prism 71 Casing main body 71a Storage chamber 72 Flange 73 Sensor storage cylinder 73a Element storage chamber 74 Terminal member 75 Connection terminal 76 Lead wire 70 Flange member 701 Mounting hole 702 Cylindrical body 703 Sensor cylinder 704 Seal member 705 Guide Groove 706 Locking groove 707 Locking projection 8 Fuel discharge section 91 Upper magnetic body 92 Lower magnetic body 91a, 92a Flange section T Fuel tank F Liquid fuel P Fuel outlet pipe

Continued on the front page. (72) Inventor Yoshihiko Takada 2-715 Kita-Kamei-cho, Yao-shi, Osaka Silver Co., Ltd. (72) Inventor Shuichi Hiramatsu 2-7-115 Kita-Kamei-cho, Yao-shi, Osaka Silver stock In-house (56) References JP-A-61-125516 (JP, A) JP-A-6-229532 (JP, A) JP-A-58-169030 (JP, A) JP-A-5-76990 (JP, U (58) Field surveyed (Int. Cl. ⁷ , DB name) F04B 49/10 311 H02K 44/02

Claims (2)

(57) [Claims] 1. An electromagnetic pump comprising: a pump unit having a fuel suction unit inserted into a fuel tank; and a sensor unit for detecting a position of an oil level with respect to the fuel suction unit in the fuel tank. A sensor having a mounting hole formed in the fuel tank, the mounting member being removably mounted, and a flange member having a mounting hole formed through the fuel suction unit for removably mounting the pump unit, this bottom of the flange member consists of a attached to the oil level sensor along with the fuel suction portion, the flange member, the lower portion
Cylinder inserted into the fuel tank and through which fuel can flow
-Shaped casing is provided, and this casing is provided therein.
The oil level sensor is protruded from the inner wall surface of the casing.
And the fuel intake section is fitted.
An electromagnetic pump provided with an oil level sensor, wherein the oil level sensor is configured to be operated. 2. An oil level sensor comprising: a prism formed of a material having a refractive index equal to that of a liquid fuel; a light emitting unit for projecting light toward the prism; and a light receiving unit for receiving light reflected by the prism. electromagnetic pumps with oil level sensor of claim 1 Symbol mounting, characterized in that it is composed of.