JPS5827804Y2 - Pump device in airless sprayer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved structure of a pump device in an electromagnetic airless sprayer that is not equipped with a compressor. In particular, by constructing the piston with a metal core embedded in a ceramic base material along its axis, the stress applied in the direction of the piston's constant prying motion inside the cylinder due to the circular arc movement of the armature caused by the electromagnet is reduced. The aim is to prevent damage caused by this type of sprayer, make it durable and economical, avoid increasing the size of the pump device, and secure the characteristics of this type of simple sprayer.

Generally, this type of sprayer has a main body 1, as shown in FIG.
An armature 3 is connected to a solenoid coil 2 which is housed in a solenoid coil 2 to form an electromagnetic device, and a switch 5 is provided protruding from a grip 4 extending integrally from the main body 1 to apply an alternating current voltage to the coil 2. By applying this voltage, the armature 3 can be reciprocated in a circular motion using its upper pivot point as a fulcrum, and a cylinder 7 is attached to a housing 6 that is integral with the main body 1 and extends in a direction orthogonal to the grip 4.
is buried, one end side of the piston 8 is disposed facing the lower part of the armature 3 in the longitudinal direction from the main body 1 to the housing 6, and the other end side is inserted and supported in the cylinder 7, and a coil spring is attached to the cylinder 7 and the piston 8. 9 allows the piston 8 to move reciprocally within the cylinder 7 by cooperating with the armature 3 due to the elastic action of the spring 9. Furthermore, a cover 10 is formed on the main body 1 for dispensing liquid paint, etc. A container 11 to be accommodated is screwed and suspended, a suction hole 12 and a discharge hole 13 are formed to communicate from the cylinder 7 to the container 11, and a valve cone 14 that acts as a valve is relayed to the free end of the housing 6. By screwing the nozzle 15, the armature 3 and piston 8 are connected to each other by the solenoid coil 2 and spring 9.
By the reciprocating motion between the cylinder 7 and the cylinder 7, paint or the like is sucked into the cylinder 7 from the container 11 to the suction hole 12 via the suction pipe 16, and then sprayed from the nozzle 15 in a well-known manner.

By the way, in the above device, the piston 8 moves within the cylinder 7 6000 times per minute with a commercial power supply of 50 Hz, and in this case, the piston 8 moves in an arc with the upper pivot point as a fulcrum. Since the structure is such that the cylinder 7 is pressed against the cylinder 7, a diagonal prying stress is constantly applied from the lower rear side to the upper side of the tip, and due to this structure, the cylinder 7 and the piston 8 are There is a problem that it is easily worn out.

For this reason, it is known that the cylinder 7 and piston 8 constituting the pump device are made of cemented carbide or ceramic materials, but the former is economically expensive for this type of simple sprayer. In the latter case, the piston 8 is particularly prone to breakage due to the prying stress within the cylinder 7 caused by the circular arc motion of the armature 3. To prevent this, the former method is necessary. Although it is conceivable to make the diameter thicker than that of the pump, there is a problem in that the pump device itself becomes larger as a result.

The present invention is intended to solve these unparalleled drawbacks of the conventional devices, and will be described in detail below based on FIG. 2 and with reference to FIG. 1.

The piston 8 is formed from a base material 17 and a core material 18. In this case, the base material 17 is made of a ceramic material with an alumina purity of 95% or more, and the core material 18 is made of, for example, a stainless steel material, and the alumina base material 18 is made of a ceramic material with an alumina purity of 95% or more. A metal core material 18 is embedded along the axis of the material 17, and one end of the piston 8 is arranged to correspond to the lower part of the armature 3, and the other end is inserted into the cylinder 7.

As a result of various experiments conducted by the present inventor and others on the piston 8 configured in this manner, it was found that a diagonal prying stress was applied to the piston 8 within the cylinder 7 from the lower part of the rear part to the upper part of the tip part due to the circular arc movement of the armature 3. However, it was confirmed that the core material 18 compensated for damage such as cracking caused by the fragility inherent in ceramics, while providing abrasion resistance due to the hardness unique to the base material 17, and that this was sufficient for practical use.

Therefore, the piston 8 can be formed to have a diameter of about 4 to 5 mm, which has the advantage of being economical without increasing the size of the pump device and not impairing the compact and simple characteristics of this type of sprayer itself. .

The cylinder 7 is preferably made of a ceramic material, but may be made of a cemented carbide or other wear-resistant metal material if necessary.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of a conventional device, and FIG. 2 is an enlarged sectional view of a main part of the present device. Main body...1, Amateur...3, Cylinder...7, Piston...8, Nozzle...15, Base material... ...17. Core material...
...18°

Claims (1)

[Scope of utility model registration request] The swinging motion of the armature caused by the excitation of an electromagnet built into the main body is converted into the reciprocating motion of a piston to suck up liquid paint into the cylinder and spray it from the nozzle, in which the upper part of the armature is pivoted to the electromagnet. The armature swings in a circular arc using this pivot point as a fulcrum, and one end of the piston is disposed opposite to the lower part of the armature, and the piston is attached to the ceramic base material along its axis. 1. A pump device for an airless sprayer, wherein a metal core is buried and the other end of the piston is inserted into a cylinder together with the metal core.