JPH04318287A - Electromagnetic pump for sanitary flushing device - Google Patents

Abstract

PURPOSE:To provide an electromagnetic pump for a sanitary flushing device having a piston of good durability at a low cost by eliminating processes of cutting work and surface treatment of the piston. CONSTITUTION:In an electromagnetic pump for a sanitary flushing device, a plunger 8 and a piston 9 are slidably fitted respectively in a plunger case 3 in an electromagnetic coil 6 and in a cylinder 10 on the shaft center coaxial with the plunger. The plunger and the piston are supported reciprocation- movably in a condition brought into contact with each other by upper and lower springs 11, 12. A tubular ceramic-made sleeve 9a is fixed by adhesion or by molding integrally with the piston to the periphery of a sliding part of the synthetic resin-made piston 9.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pump for pressure-feeding hot water, etc., used in a sanitary cleaning device for cleaning valve seats and the like for cleaning private parts of the human body.

0002

[Prior Art] This type of electromagnetic pump has an electromagnetic coil,
A non-magnetic plunger case is provided coaxially within the electromagnetic coil, a plunger is slidably fitted into the plunger case, and a plunger is slidably fitted into the cylinder on the same axis as the plunger. The plunger is provided with a mating piston, a suction joint provided upstream of the piston, and a discharge joint provided downstream of the plunger, and the plunger and piston are able to freely reciprocate while in contact with each other by an upper spring and a lower spring. is supported by

Since such electromagnetic pumps use hot water, corrosion-resistant stainless steel is used as the material for the piston. However, since the material is hard, the cost during cutting increases, and the piston is damaged after machining. In order to reduce sliding resistance on the circumferential surface and improve durability, hard chrome plating was applied to the sliding parts to harden the surface, resulting in a significant increase in the cost of electromagnetic pumps. .

0004

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an electromagnetic device for sanitary cleaning equipment of the type mentioned at the outset, which has a piston that eliminates the cutting and surface hardening steps of the piston, thereby significantly reducing costs. is to provide a pump.

[0005]

[Means for Solving the Problems] In order to solve the above object, an electromagnetic pump according to the present invention is characterized in that a cylindrical ceramic sleeve is fixed to the outer periphery of the sliding portion of the piston.

[0006] In this case, it is convenient to fix the ceramic sleeve to the piston by adhering the sleeve to the synthetic resin piston body or by molding it integrally with the synthetic resin piston body.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below with reference to embodiments shown in the drawings.

FIG. 1 shows an electromagnetic pump for a sanitary cleaning device for cleaning private parts of the human body, which is equipped with a piston according to the present invention. Between the suction joint 1 and the discharge joint 2, there is a plunger case 3, and an upper magnetic path 4 and a lower magnetic path 5 are arranged coaxially with the outer side of the plunger case 3. Further, the outer sides of the upper magnetic path 4 and the lower magnetic path 5 are surrounded by an electromagnetic coil 6, and the outer sides thereof are held by an outer case 7.

A plunger 8 is slidably fitted into the plunger case 3, and a piston 9 is coaxially located below the plunger 8, and is inserted into a cylinder 10 attached to the suction joint 1. They are slidably fitted. The plunger 8 and the piston 9 are connected to an upper spring 11 supported by the discharge joint 2.
and a lower spring 12 supported on the outside of the cylinder 10, and are pressed against each other with equal repulsive forces in opposite directions.

A suction valve 13 is built into the suction joint 1, and a discharge valve 14 is provided at the top of the piston.

According to the present invention, as shown in FIG. 3, a cylindrical ceramic sleeve 9a is molded integrally with the piston body 9 on the outer periphery of the piston body 9 made of synthetic resin, or the piston body 9 is separately formed. After molding, it is fixed to the outer periphery of the piston body by adhesive. As is clear from FIG. 1, the upper part of the piston body 9 serves as a spring support for the lower spring 12, so it is desirable to use a material that has some degree of mechanical strength, such as a material made of polyacetal resin reinforced with glass fiber. . Note that if the entire piston 9 is molded from ceramic, it cannot be put to practical use because the mechanical strength (impact resistance) of the lower spring support portion is weak and the cost increases significantly.

The operation of the electromagnetic pump according to the present invention will be briefly explained. When the electromagnetic coil 6 is energized with a current, the plunger 8 moves along with the piston 9 from the position of the balance point between the upper and lower springs 11 and 12 in the direction of the lower magnetic path 5, ie, downward in FIG. At this time, the suction valve 13 closes and the pressure in the space between the suction valve 13 and the discharge valve 14 increases, so the discharge valve 14 opens and the hot water moves to the upper spring chamber 15. do. Next, when the current to the electromagnetic coil 6 is cut off, the magnetic attraction force disappears and the plunger 8 and piston 9 return to their original positions due to the repulsive force of the lower spring 12. At this time, the discharge valve 14 closes and both valves Since the space between them becomes negative pressure, the suction valve 13 opens and hot water flows in through the suction fitting 1, and at the same time, the hot water in the spring chamber 15 is discharged through the discharge fitting 2. A pumping action is performed by repeating this process.

[0013]

[Effects of the Invention] In the electromagnetic pump for sanitary washing equipment of the present invention, a cylindrical ceramic sleeve is fixed to the outer periphery of the sliding portion of the piston body, so that extremely low sliding resistance and high durability can be obtained. This eliminates the need for cutting the outer periphery of the sliding part and surface treatment processes such as hard chrome plating, which were conventionally performed on pistons, making it possible to provide an electromagnetic pump that is both low cost and highly durable.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of an electromagnetic pump for sanitary washing equipment equipped with a piston according to the present invention.

FIG. 2 is a longitudinal sectional view of the piston of the present invention.

3 is a cross-sectional view taken along line III-III in FIG. 2; FIG.

[Explanation of symbols]

1 Suction joint 2 Discharge joint 3 Plunger case 6 Electromagnetic coil 8 Plunger 9 Piston 9a Sleeve 10 Cylinder 11 Upper spring 12 Lower spring

Claims (2)

[Claims] [Claim 1] An electromagnetic coil; a non-magnetic plunger case disposed coaxially within the electromagnetic coil;
A plunger that is slidably fitted into the plunger case, a piston that is slidably fitted to the cylinder on the same axis as the plunger, a suction joint provided upstream of the piston, and a downstream of the plunger. an electromagnetic pump for a sanitary washing device, wherein the plunger and the piston are supported in a reciprocating manner while being in contact with each other by an upper spring and a lower spring; An electromagnetic pump characterized by having a cylindrical ceramic sleeve fixed to it. 2. The ceramic sleeve is fixed to the piston by adhering the sleeve to the synthetic resin piston body or by molding the sleeve integrally with the synthetic resin piston body. Electromagnetic pump for sanitary cleaning equipment described in .