JPH0332790Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention is an electromagnetic reciprocating system that compresses or attracts fluid by reciprocating a piston through the interaction of an electromagnetic means and an elastic body. This invention relates to a dynamic pump device.

(Prior Art) A conventional electromagnetic reciprocating pump device has, for example, an armature formed by stacking magnetic iron plates such as silicon steel plates in the axial center of the front and rear pistons, each of which is made of aluminum die-casting. A constant current is obtained by half-wave rectifying the AC power by supporting the front cylinder and rear cylinder so that they can reciprocate in the axial direction and biasing them in the front direction by a coil spring (elastic body). By applying pulses at intervals to a magnetic circuit provided around the armature to generate magnetic force, the armature is attracted against the biasing force of the coil spring, causing the piston to move forward, and the magnetic circuit is During demagnetization, the piston is moved back by the spring force of the coil spring, and by reciprocating the piston between the front cylinder and the rear cylinder, it compresses the fluid drawn into the cylinder or draws fluid from other parts. It was something that attracted me.

(Problem to be solved by the invention) In such conventional electromagnetic reciprocating pump devices, for example, the rear cylinder is machined from aluminum die-casting as described above, and in order to improve wear resistance, a reciprocating piston is used. The sliding surfaces of aluminum die-cast aluminum are treated with hard alumite, but when aluminum die-casting is treated with hard alumite, the sliding surfaces flow, so in order to eliminate this problem, honing was used to improve the surface accuracy. However, this process has the problem of reducing manufacturing efficiency, and if the rear cylinder is integrally formed from aluminum die-casting, eddy currents are generated in the rear cylinder when the magnetic circuit is activated, and these eddy currents cause the piston to reciprocate. A situation occurred that had a negative impact on the movement. Therefore, conventionally, it has been necessary to provide magnetic insulation between the front cylinder and the rear cylinder, that is, at the joint between the front cylinder and the rear cylinder using an insulating member. Therefore, in this case as well, assembly efficiency has been reduced.

(Purpose of the invention) This invention eliminates the need for eddy currents to be generated between the front cylinder and the rear cylinder, thereby making the reciprocating movement of the piston smoother than before. This is the purpose.

[Structure of the invention] (Means for solving the problems) In order to achieve the above object, the electromagnetic reciprocating pump device of this invention has a structure in which at least the rear cylinder of the front cylinder and the rear cylinder is made of a resin molded body. However, this problem is solved by adopting a structure in which a cylindrical liner made of a non-magnetic material is fitted into the inner surface of the cylinder made of the resin molded body to support the rear part of the piston.

(Example) This invention will be explained below based on the drawings.

1 to 4 show an air compressor as an embodiment of this invention, and FIG. 1 is a longitudinal sectional side view.

In FIG. 1, 1 is the air compressor main body. This air compressor main body 1 is
It has a body part 2 in its central part, and the left end of the body part 2 in the figure is provided with a first lid body 3 that covers the left end opening of the body part 2, and the right end is provided with a magnetic thin iron plate such as a silicon steel plate. A second lid body 5 is provided which covers the right end opening of the body part 2, with an electromagnetic iron core 4 having laminated layers interposed in the center thereof, and the first lid body 3 and the second lid body 5 are It is integrally connected to the body part 2 with an iron core 4 in between using bolts (not shown).

As shown in FIG. 4, the iron core 4 is shaped like a substantially E-shape facing each other, and a pair of left and right magnetic poles 12, 12 have induction coils 13b, 13b wound around bobbins 13a, 13a. Coils 13, 13 are inserted to form a magnetic circuit. The pair of left and right magnetic poles 12, 12 face each other with a small gap maintained between the outer peripheral surfaces of an armature 35, which will be described later. A rectifier 14 for half-wave rectifying the AC power source is connected to the induction coils 13, 13.

Reference numeral 21 denotes a front cylinder, which is fitted into a cylindrical portion 2a formed on the left side of the body portion 2 with a seal packing 10 interposed therebetween. This front cylinder 21 is provided with an exhaust port equipped with an exhaust valve (not shown) on the outer periphery of a working chamber 40 (described later) defined by the cylinder.

Reference numeral 22 denotes a rear cylinder, which is made of a resin molded body, and as shown in FIGS. Notches 24, 24 formed on both sides and the piston holding portion 2
A flange 2 that protrudes in the vertical direction on the opening side of 3.
5.25. The rear cylinder 22 has an exhaust hole at the rear of the piston holding portion 23 to maintain the same at atmospheric pressure, but the rear portion is generally closed and supports a coil spring 27 via a spring seat 26. A steel ball 28 is provided by insert molding. Further, a smooth liner 29 made of an extruded pipe made of a suitable aluminum-based material is fitted and bonded to the inner circumferential surface of the rear cylinder 22 as a sliding material. Note that the liner 29 is hard alumite treated to improve its wear resistance, but since the liner 29 is an extruded pipe made of aluminum-based material, the surface will be roughened even with the hard alumite treatment. Never. Therefore, the inner surface of the cylindrical liner 29 after hard alumite is finished as a highly accurate sliding surface on which a piston 31, which will be described later, slides.

The rear cylinder 22 configured in this manner is fixed to the left side of the central end of the body section 2 by bolts 30, 30 using the flanges 25, 25.

31 is a piston. This piston 31 is
A front piston 32 that slides inside the front cylinder 21 and a rear piston 33 that slides inside the rear cylinder 22 are connected and integrally formed by a connecting portion 34, and a substantially central portion of the connecting portion 34 is formed integrally. That is, a magnetic armature 35 made of laminated annular silicon steel plates is attached to the central portion of the piston 31 in the axial direction. In addition,
The front piston 32 and the rear piston 3
Coatings 36 and 37 made of fluorine-based resin (trade name: Teflon, Fluon, etc.) are pasted on the outer circumferential surface of 3. This coating 36 is provided to improve the sliding characteristics between the front cylinder 21 and the rear cylinder 22 and to improve the wear resistance of the front piston 32 and rear piston 33.

The piston 31 configured in this manner is supported by the front cylinder 21 and the rear cylinder 22, and is urged in the front direction by the coil spring 27.

Further, the piston 31 is attracted in the rear direction against the biasing force of the coil spring 27 due to the magnetic force generated in the magnetic poles 12, 12 at predetermined intervals, and when the magnetic poles 12, 12 are demagnetized, the piston 31 It moves back in the front direction due to the elastic force of the spring 27, and this movement is repeated periodically to reciprocate with a required stroke.

At the tip of the front piston 32, a first
A suction valve 4 is located in the working chamber 40 surrounded by the lid body 3, the front cylinder 21, and the front piston 32.
A plurality of suction ports 41 are provided through which air is sucked through. This suction valve 42 is bent when the piston 31 slides in the rear direction, and the suction valve 42
Open it and breathe in the air. That is, when the piston 31 moves forward, air is sucked into the working chamber 40, and when the piston 31 moves backward, the air that has flowed into the working chamber 40 is prevented from flowing out from the suction port 41. It functions as a directional valve.

Reference numeral 43 denotes a groove formed in the first lid 3 to prevent the suction valve 42 from coming into contact with the first lid 3 when the front piston 32 reaches the top dead center. .

Reference numeral 44 denotes an air circulation hole formed in the outer peripheral wall of the second lid body 5. This air circulation hole 44 serves to guide external air into the air compressor main body 1 and introduce it into the working chamber 40 via the suction valve 42 . Note that the air flowing inside the air compressor 1 also has the function of cooling the inside of the air compressor 1.

Reference numeral 45 denotes an air tank formed in an annular shape around the outer periphery of the cylinder 21 by the first lid body 3 and the body part 2. This air tank 45 is for absorbing pulsations of compressed air pressurized by the front piston 31. 46 is a discharge port provided in the air tank 45.

Next, the operation of the air compressor 1 having the above configuration will be explained.

Supply AC power to air compressor 1,
When half-wave rectification is performed by the rectifier 1, pulses are applied to the induction coils 13, 13 at regular intervals, and the magnetic poles 12, 12 are periodically excited, attracting the armature 35, and starting the piston 31. .

That is, the armature 35 is attracted by the magnetic force generated between the magnetic poles 12, 12, and the coil spring 2
When the piston 31 is started in the rear direction against the urging force of 7, the intake port 41 of the front piston 32
Air flows into the working chamber 40 from the inside.

Next, when the magnetic force of the magnetic poles 12, 12 disappears in the AC half wave, the piston 31 is returned to the front direction by the biasing force of the coil spring 27.
In this process, the air in the working chamber 40 pressurized by the front piston 32 is discharged into the tank 45 through the discharge port 46 provided in the front cylinder 21, and the tank 45 absorbs the pulsation of the compressed air. It is discharged from the discharge port 46 and supplied to, for example, an air pine surger, a blower, an air brush nozzle, an air spray, etc. via a pipe (not shown).

In this way, due to the alternation of the magnetic force generated between the magnetic poles 12 and 12 and the biasing force of the coil spring 27, the piston 31 is moved in synchronization with the frequency of the commercial alternating current.
In order to reciprocate, air is pressurized continuously. Inside the rear cylinder 22, the rear piston 33 reciprocates in surface contact with the inner circumferential surface of the liner 29 to prevent the deflection of the piston 31. To prevent.

In the above embodiment, an extruded aluminum pipe is used as the liner 29, but a cylindrical liner made of non-magnetic fluorine resin may be used as the sliding material. It is not limited to.

[Effects of the invention] As explained above, according to this invention, at least the rear cylinder is formed of a resin molded body relative to the front cylinder, and the inner surface of the rear cylinder is formed into a smooth cylindrical shape made of a non-magnetic material. Since the liner is fitted, it is possible to prevent the generation of eddy currents within the rear cylinder, and there is no need to interpose an electrically insulating member when assembling the rear cylinder, unlike in the conventional case. Moreover, this invention not only improves the efficiency of assembly work, but also contributes to lower production costs because there is no need for finishing by honing, which is required when manufacturing rear cylinders by die-casting. , excellent practical effects can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view showing an air compressor as an embodiment of this invention, Fig. 2 is a front view showing the rear cylinder, and Fig. 3 is a 4-way view of the rear cylinder.
FIG. 4 is a half-cut side view and a front view of the iron core. 1...Air compressor (electromagnetic reciprocating pump device), 4...Iron core, 12...Magnetic pole (electromagnetic means), 13...Induction coil (electromagnetic means), 21...Front cylinder, 22... Rear cylinder, 27...Coil spring (elastic body),
29... Liner, 31... Piston, 32...
Front piston, 33...Rear piston, 35
...Armachia.

Claims (1)

[Scope of utility model registration request] The front and rear parts of a piston, which has an armature in its axial center, are supported by a front cylinder and a rear cylinder so as to be able to reciprocate. In an electromagnetic reciprocating pump device of the type that moves back by the urging force of An electromagnetic reciprocating pump device that supports the rear part of the piston by fitting a cylindrical liner made of material.