JP3286808B2 - Electromagnetic pump - 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 which is used in a sanitary washing device or the like and which performs a pumping operation by changing the volume of a pump chamber by means of a piston which reciprocates by electromagnetic force to pump a fluid.

[0002]

2. Description of the Related Art Japanese Patent Publication No.
Japanese Unexamined Patent Publication Nos. 78387, 9-112417, 6-288341, and the like are known. These electromagnetic pumps have a common basic configuration, and have the following general configuration.

In an electromagnetic pump, a tubular guide pipe is fixed to the center of an electromagnetic coil to which a pulse wave current is supplied, and an electromagnetic plunger is slidably disposed in the guide pipe. A slidably inserted piston abuts, and the electromagnetic plunger and the piston are supported by an upper spring and a lower spring such that they can reciprocate.

The electromagnetic plunger and the piston are formed in a cylindrical shape arranged on the same axis and the inside thereof serves as a fluid passage. A suction joint is provided upstream of the cylinder, and a suction joint is provided downstream of the electromagnetic plunger. Are provided with discharge joints, respectively.
The suction joint and the discharge joint communicate with each other via a cylinder, a piston, and an inner passage of an electromagnetic plunger. A suction valve is provided on the upstream side of the piston, and a discharge valve is provided on the downstream side. A pump chamber is formed from the suction valve to the discharge valve, and an electromagnetic plunger is formed by a pulse current supplied to the electromagnetic coil. When reciprocating, the piston is moved in accordance with this, and the volume of the pump chamber fluctuates, whereby the fluid flowing into the pump chamber from the suction joint via the suction valve is pressurized by the pump chamber, and then the discharge valve is opened. Through the discharge joint.

[0005]

However, in the above-described electromagnetic pump, since the contact state between the electromagnetic plunger and the piston depends on the urging force of the upper spring and the lower spring, the electromagnetic plunger and the piston move at a high speed. In this state, the electromagnetic plunger and the piston are momentarily separated from each other for some reason, and the noise is increased due to this. If the contact state between the electromagnetic plunger and the piston is not ensured, the fluid filled around the electromagnetic plunger or the piston invades from the contact portion between the electromagnetic plunger and the piston, and this intrusion occurs. The movement of the discharge valve becomes unstable due to the fluid, and the discharge valve generates abnormal noise.

Further, if the lift of the valve body of the suction valve or the discharge valve is large, the noise generated upon contact with the seat surface is also large. As described above, since the suction valve and the discharge valve have the same diameter and the diameter of the seat surface is also the same, no particular consideration is given to reducing the lift of the valve body.

For this reason, when the above-described electromagnetic pump is incorporated in a device which is installed in a quiet space such as a sanitary washing device, the sound of the electromagnetic pump itself is not so loud, but in a quiet space. This sound sounds unpleasant to some people. Therefore, it is desirable to reduce the noise generated from the electromagnetic pump as much as possible. In the present invention, it is an object to improve the structure of the electromagnetic pump to reduce noise.

[0008]

In order to achieve the above object, an electromagnetic pump according to the present invention is provided with a cylindrical guide pipe fixed in an electromagnetic coil and slidably disposed in the guide pipe. An electromagnetic plunger, a piston disposed on the axis of the electromagnetic plunger and slidably inserted into a cylinder, a first spring for urging the electromagnetic plunger toward the piston, and a piston mounted on the electromagnetic plunger. A second spring that urges the electromagnetic plunger and the piston by the first and second springs so as to be axially displaceable in a state where the electromagnetic plunger and the piston abut against each other, on the upstream side of the piston. The suction valve,
Discharge valves are respectively provided on the downstream side, and the electromagnetic plunger is reciprocated by applying an intermittent current to the electromagnetic coil, so that the volume of a pump chamber formed between the suction valve and the discharge valve is adjusted by the piston. In such a configuration, a buffer is interposed between the electromagnetic plunger and the piston, and the electromagnetic plunger and the piston are abutted by the first and second springs via the buffer. It is characterized by being in a state (claim 1).

According to such a configuration, since the electromagnetic plunger and the piston abut against each other via the cushioning material, the electromagnetic plunger does not separate even if the force for abutting the electromagnetic plunger and the piston is weakened for some reason.
In addition, since the space between the electromagnetic plunger and the piston is sealed with the cushioning material, fluid does not enter from between the electromagnetic plunger and the piston and does not affect the movement of the discharge valve. It is possible to suppress the occurrence of collision noise and abnormal noise of the discharge valve.

Further, as a configuration for reducing noise of the electromagnetic pump, a suction valve and a discharge valve are provided with a valve body and a valve spring provided on the upstream side thereof for urging the valve body against a seat portion. The diameter of the seat portion on which the valve body of the suction valve is seated is made larger than the diameter of the seat portion on which the valve body of the discharge valve is seated, and the diameter of the valve body of the suction valve is larger than that of the discharge valve. May be increased (claim 2).

Further, as a configuration for reducing noise of the electromagnetic pump, a suction valve and a discharge valve are provided with a valve body and a valve spring for urging the valve body against a seat portion provided upstream thereof. The diameter of the seat portion on which the valve element of the suction valve is seated is larger than the diameter of the seat portion on which the valve element of the discharge valve is seated, and the diameter of the valve element of the suction valve is The diameter may be larger than the diameter of the valve body of the discharge valve.

In addition to the above construction, in order to reduce the size of the electromagnetic pump in the axial direction, the cylinder may be mounted on a spring receiver for receiving the valve spring of the suction valve. In order to simplify the above, a discharge pipe connected to a discharge joint provided on the downstream side of the discharge valve may be fixed to a yoke accommodating the electromagnetic coil or a mounting plate fixed to this yoke. Further, a cooling mechanism may be provided on the yoke or the mounting plate to cool the electromagnetic pump (claim 5).

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 to FIG. 3, in an electromagnetic pump 1, an electromagnetic coil 2 to which an intermittent current (pulse current) is supplied is wound around a bobbin 3 made of resin, and the entirety thereof is a yoke 4
Is housed inside. In the bobbin 3, a pair of magnetic pole cylinders 6 and 7 made of a magnetic material separated in the middle through the center through hole 5 are fitted with an intermediate ring 8 made of a non-magnetic material interposed therebetween. Further, a metallic guide pipe 9 is fitted and fixed. At both ends of the bobbin 3, a magnetic pole plate 1
Reference numerals 0 and 11 are attached, and the yoke 4 and the pole cylinders 6 and 7 constitute a magnetic circuit.

A suction joint 13 made of synthetic resin is externally fitted to one end of the guide pipe 9 through an O-ring 12, and a discharge joint made of synthetic resin is also made to the other end through an O-ring 14. The joint 15 is externally fitted. An electromagnetic plunger 16 is slidably disposed in the guide pipe 9. The electromagnetic plunger 16 is formed in a cylindrical shape from a magnetic material such as iron. A groove 16a is provided at both ends on the outer surface, and a spring receiver 17 projecting inward is provided on the inner surface. The spring receiver 17 receives the first spring 19 which is elastically mounted between the spring joint 17 and a spring receiver 18 provided on the discharge joint 15.

A piston 20 having the same axis as the electromagnetic plunger 16 is arranged in the guide pipe 9 on the suction joint side of the electromagnetic plunger 16. The piston 20 is slidably inserted into a cylinder 21 fixed at one end of the guide pipe 9, is entirely formed in a cylindrical shape, and expands in diameter toward a side close to the electromagnetic plunger 16 to receive a spring. A second spring 24 is elastically mounted between the spring receiver 22 and an outwardly projecting flange 23 provided on the cylinder 21 in a compressed state.

The electromagnetic plunger 16 and the piston 20
Are brought into contact with each other via a cushioning member 25 made of a rubber ring interposed between the open end of the electromagnetic plunger 16 and the back surface of the spring receiver 22 of the piston 20. The piston 20 is urged toward the piston, and the piston 20 is
Is biased toward the electromagnetic plunger by
The electromagnetic plunger 16 and the piston 20 are supported so as to be able to reciprocate in the axial direction of the guide pipe 9 in a state where the electromagnetic plunger 16 and the piston 20 are abutted to compress the cushioning material 25. It comes to rest at a position where the forces are balanced.

The cylinder 21 is made of a synthetic resin, and is fitted in an annular suction valve spring receiver 28 attached to the suction joint 13 via an O-ring 27. The cylinder 21 is provided with an O-
A ring 29 is fixed between the guide pipe 9 and the suction valve spring receiver 28.

Therefore, the suction joint 13 and the discharge joint 15
Means the intake valve spring receiver 28, the cylinder 21, the piston 2
0, the first spring 1 is connected to the cylinder 21 and the piston 20 in which the second spring 24 is disposed and communicates with each other through a passage formed inside the electromagnetic plunger 16.
9 and the groove 1 on the outer peripheral surface of the electromagnetic plunger 16
6a.

A suction valve 30 housed in the suction joint 13 is provided upstream of the cylinder 21, and a discharge valve 31 housed in the electromagnetic plunger 16 is provided downstream of the piston 20. , The suction valve 30 and the discharge valve 3
The pump chamber 32 is constituted by the area defined by the reference numeral 1.

The suction valve 30 and the discharge valve 31 are check valves composed of valve springs 30a, 31a and valve bodies 30b, 31b urged by the valve springs. The valve element 30b is brought into contact with the provided sheet member 13a from the downstream side, and this valve element 3
A valve spring 30a is elastically mounted between the pump chamber 32 and the suction valve spring receiver 28 so that the fluid does not flow backward from the pump chamber 32 to the upstream side. The discharge valve 31 is provided in a cylindrical discharge valve case 34 disposed between the spring receiver 17 of the electromagnetic plunger 16 and the piston 20, and an annular seat member 35 fitted to an end of the piston 20. Of the valve body 31b from the downstream side with the seat portion 35a of the
1b and a spring receiver 3 provided inside the discharge valve case 34
6, a valve spring 31a is elastically mounted so that the fluid does not flow back to the pump chamber 32 from the downstream side.

In the prior art, the suction valve spring receiver 28 and the member into which the cylinder 21 is fitted are formed separately. However, in this configuration, the suction valve spring receiver 28 The function as a spring receiver for receiving the valve spring 30a and the function as a base for assembling the cylinder 21 are also used, and the axial dimension of the electromagnetic pump 1 is shortened. In this configuration example, the suction valve spring receiver 28 and the cylinder 21 are provided separately, but they may be formed as an integral member.

The diameter of the seat 13a formed on the suction joint 13 on which the valve 30b of the suction valve 30 is seated is the same as the diameter of the seat 35a formed on the end of the piston on which the valve 31b of the discharge valve 31 is seated. The diameter of the valve body 30b of the suction valve 30 is also larger than the diameter of the valve body 31b of the discharge valve 31 so as to correspond to the diameter.

Numeral 37 denotes an accumulator attached to the discharge joint. Numeral 38 denotes a mounting plate for fixing the electromagnetic pump to a predetermined mounting position. The mounting plate 38 is fixed to the yoke 4 by screws 39. ing. Reference numeral 40 denotes a discharge pipe assembled to the discharge joint 15 via an O-ring 41. The discharge pipe 40 is fixed to a mounting plate 38 by screws 43 with a mounting piece 42 provided on the discharge pipe. The piping work is simplified. The electromagnetic pump 1 may be cooled by providing a fin integrally with the discharge pipe 40 or by providing a passage through which the cooling fluid flows in the mounting plate 38.

In the above configuration, when the electromagnetic coil 2 is excited, the electromagnetic plunger 16 is displaced against the second spring 24, and accordingly, the piston 20 is also displaced in the same direction and the volume of the pump chamber 32 is increased. Is reduced and the pump chamber 32
When the pump chamber pressure becomes higher than the sprig pressure of the discharge valve 31, the valve body 31b
As a result, the fluid in the pump chamber is pumped from the discharge pipe 40.

On the other hand, when the electromagnetic coil 2 is demagnetized, the electromagnetic plunger 16 moves to the first and second springs 1.
The spring forces 9 and 24 are returned to a position where they are balanced, and accordingly, the piston 20 is also displaced in the same direction to make the pump chamber 32 a negative pressure. Then, the valve body 30b of the suction valve 30 is lifted against the spring 30a, and the fluid on the upstream side is sucked into the pump chamber 32.

As described above, the volume of the pump chamber 32 fluctuates due to the reciprocation of the piston 20, and the pump action is performed by the change in the volume of the pump chamber 32 and the accompanying opening / closing operation of the suction valve 30 and the discharge valve 31. Run.

Such operation is repeated 50 times per second at 50 Hz and 60 times per second at 60 Hz when the commercial current is half-wave rectified as the intermittent current. As long as is energized, the fluid is continuously pressure-fed, while the movable parts such as the electromagnetic plunger 16, the piston 20, the valve bodies 30b and 31b also operate at a cycle corresponding to this cycle number.
Noise is generated.

In particular, the electromagnetic plunger 16 and the piston 20
Reciprocates while being supported by butting against the first and second springs 19 and 24, and if the balance of the spring force is disturbed due to the inertia of the electromagnetic plunger 16 and the piston 20, the electromagnetic plunger 16
The butted state of the piston 20 and the piston 20 is loosened and tends to momentarily separate.

With the conventional configuration, the electromagnetic plunger 16
And the piston 20 are momentarily separated from each other and abut against each other, so that the sound of the collision between the electromagnetic plunger 16 and the piston 20 is one of the causes of an increase in noise. However, in the present configuration, a cushioning material 25 made of a rubber ring is interposed between the electromagnetic plunger 16 and the piston 20, and is usually compressed by the spring force of the first and second springs 19 and 24. Therefore, no gap is formed between the electromagnetic plunger 16 and the piston 20 even if the butting state between the electromagnetic plunger 16 and the piston 20 is loosened for some reason.

As a result, no collision sound is generated between the electromagnetic plunger 16 and the piston 20 and no gap is formed between the electromagnetic plunger 16 and the piston 20. The fluid does not intrude from the outside of 16 and does not affect the movement of the valve element 31b of the discharge valve 31, so that the noise generated from the discharge valve 31 can be suppressed.

Further, since the diameter of the valve body 30b and the seat portion 13a of the suction valve 30 are formed larger than those of the discharge valve 31, the suction efficiency of the fluid of the suction valve 30 can be improved, and The valve noise can be reduced by suppressing the lift amount of the valve body 30b of the valve 30.

Tables 1 and 2 show the results of measuring the noise values of the injection pump having the above configuration. Here, the experimental data in Table 1 is based on the basement (2.5 m x 3.5 m x 2.2 m)
, And the experimental data in Table 2 was measured at night on the second floor of the applicant's factory. In each case, the noise values were measured for four prototypes (pump No. 1, pump No. 2, pump No. 3, pump No. 4), and the suction hose connected to the suction joint 13 had an inner diameter of 8 m.
m, an outer shape of 12 mm and a length of 190 mm made of silicone rubber were used. Pump No. 1 and No. 1 2 uses a coil in which a winding having a diameter of 0.45 mm is wound 1500 times,
Pump No. 3 and No. 3 No. 4 uses a coil in which a winding having a diameter of 0.45 mm is wound 1450 times. In the measurement, the electromagnetic pump 1 was fixed to a table, and a sound level meter was placed at a distance of 1 m from the electromagnetic pump and 0.6 m from the floor, and the measurement was performed when the intermittent current to the coil was 50 Hz and 60 Hz.

[0033]

[Table 1]

[0034]

[Table 2]

As can be seen from the measurement results, the average of the noise values measured in the basement is 34.3 dB at 50 Hz.
(A), 35.8 dB (A) at 60 Hz, and the average of noise values measured on the second floor is 33.4 dB at 50 Hz.
B (A) was 33.5 dB (A) at 60 Hz. These noise values are smaller than the conventional ones. For example, comparing the product of the present invention and the conventional product measured in a basement, as shown in Table 3, if the intermittent current is 50 Hz,
In the case of 2.7 dB (A) and 60 Hz, 3.2 dB
B (A) was reduced, and the noise level was able to be reduced as a whole.

[0036]

[Table 3]

[0037]

As described above, according to the present invention,
In the electromagnetic pump in which the electromagnetic plunger reciprocates in a state where the electromagnetic plunger abuts against the piston by the first and second springs, a shock absorbing material is interposed between the electromagnetic plunger and the piston. In addition, since there is no fluid that enters from between the electromagnetic plunger and the piston, stable movement of the discharge valve is not hindered, and abnormal noise generated from the discharge valve can be suppressed.

Further, the diameter of the seat portion on which the valve body of the suction valve is seated is made larger than the diameter of the seat portion on which the valve body of the discharge valve is seated, and the diameter of the valve body of the suction valve is larger than that of the discharge valve. If the value is increased, the suction efficiency of the fluid can be increased, and the lift of the valve body of the suction valve can be reduced to reduce the valve noise.

In addition to the above effects, if the cylinder is assembled to the spring receiver for receiving the valve spring of the suction valve, the conventional structure in which the spring receiver and the cylinder mounting part are separately formed is provided. Also, the axial dimension of the electromagnetic pump can be reduced, and the discharge joint provided on the downstream side of the discharge valve can be fixed to a yoke for housing the electromagnetic coil or a mounting plate fixed to this yoke. If this is the case, the piping work can be simplified. Furthermore, if a cooling mechanism is provided on the yoke or the mounting plate, the temperature rise of the electromagnetic pump can be suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration example of an electromagnetic pump according to the present invention.

FIG. 2 is a view of the electromagnetic pump of FIG. 1 as viewed from below.

FIG. 3 is an enlarged view showing an electromagnetic plunger and a piston of the electromagnetic pump shown in FIG. 1;

[Explanation of symbols]

 2 electromagnetic coil 4 yoke 9 guide pipe 13 suction joint 13a seat part 15 discharge joint 16 electromagnetic plunger 19 first spring 20 piston 21 cylinder 24 second spring 25 buffer material 28 suction valve spring receiver 30 suction valve 30a valve spring 30b valve Body 31 Discharge valve 31a Valve spring 31b Valve body 32 Pump chamber 35a Seat 38 Mounting plate 40 Discharge pipe

Claims (5)

(57) [Claims] 1. A cylindrical guide pipe fixed in an electromagnetic coil, an electromagnetic plunger slidably disposed in the guide pipe, and slidable on a cylinder disposed on an axis of the electromagnetic plunger. , A first spring for urging the electromagnetic plunger toward the piston, and a second spring for urging the piston toward the electromagnetic plunger, wherein the first and second springs are provided. The electromagnetic plunger and the piston are supported by a spring so that they can be displaced in the axial direction in a state where the piston and the piston abut against each other,
A suction valve is provided on the upstream side of the piston, and a discharge valve is provided on the downstream side, and the electromagnetic plunger is reciprocated by applying an intermittent current to the electromagnetic coil to form a structure between the suction valve and the discharge valve. An electromagnetic pump in which the volume of a pump chamber to be moved is varied by the piston, wherein a buffer is interposed between the electromagnetic plunger and the piston, and the electromagnetic plunger and the piston are moved by the first and second springs. Characterized in that they are brought into contact with each other via the cushioning material. 2. The suction valve according to claim 1, wherein the suction valve and the discharge valve include a valve body and a valve spring provided on an upstream side thereof for urging the valve body against a seat portion. The diameter of the seat portion on which the valve body is seated is larger than the diameter of the seat portion on which the valve body of the discharge valve is seated, and the diameter of the valve body of the suction valve is larger than the diameter of the valve body of the discharge valve. The electromagnetic pump according to claim 1, wherein: 3. The cylinder according to claim 1, wherein the cylinder is mounted on a spring receiver for receiving a valve spring of the suction valve.
Or the electromagnetic pump according to 2. 4. A discharge joint is provided downstream of the discharge valve,
4. The electromagnetic pump according to claim 1, wherein a discharge pipe connected to the discharge joint is fixed to a yoke accommodating the electromagnetic coil or a mounting plate fixed to the yoke. 5. The electromagnetic pump according to claim 4, wherein a cooling mechanism is provided on the yoke or the mounting plate.