JPS62214288A - Linear pump - Google Patents

Abstract

PURPOSE:To make an assembling work easy, by forming a magnetic core in a shape such that magnetic poles project from the inner surfaces of both U-shaped leg portions of the core, and defining a gap between both magnetic pole surfaces of the magnetic poles for inserting a movable element thereinto. CONSTITUTION:Diaphragms 3 are connected to both reciprocative ends of a movable element 2, and suction and exhaust operations are conducted by the displacement of the diaphragms 3. A core 11 of an electromagnet 1 is formed in a shape such that magnetic poles 14 project from the inner surfaces of both U-shaped leg portions of the core 11. There is defined a gap 15 between magnetic pole surfaces 13 formed at respective inside ends of both the magnetic poles 14. With this arrangement, the movable element 2 preliminarily connected to the diaphragms 3 may be inserted into the gap 15, thereby improving the workability of assembling.

Description

Detailed description of the invention 3. 41Y side of the invention, r51117+ [Technical field] The present invention is mainly used for linear pumps, more specifically, air mats for preventing bedsores, Massano apparatus a using air pressure, etc. This invention relates to a small linear pump that drives a diaphragm as a movable element reciprocates by an electromagnet.

[Back P, Technology J Generally, this type of linear pump, as shown in Figure 4,
An electromagnet 1'' in which a coil 12 is wound around a core 11'', a mover 2 that is inserted into a gap 15 of the core 11° and reciprocates in a direction along the bB plane 3 of the electromagnet 1'', and a mover 2.
It is equipped with a diaphragm 3 connected to both ends of the i-direction (reciprocation), and when an alternating current is applied to the fill 12, an alternating magnetic field generated in the gap part ]5 and a permanent magnet provided in the mover 2 are provided. The reciprocating motion of the mover 2 due to magnetic interaction with the diaphragm 3 is caused to displace the diaphragm 3 in the ) γ direction, and the compression chamber formed in the opening between the die 77 ram 3 and a part of the casing 5 is It is designed to take in and exhaust the air inside 4.

By the way, as shown in FIGS. 5 and 6, the conventional electromagnet 1' has a pair of core bodies 10 formed in a substantially E-shape.
It is composed of a core 11'' having a shape in which the distal ends of the leg pieces of 10' are butted against each other, and a coil 12 wound around the central leg piece of each core body 10'. Of the three leg pieces, the center leg piece was formed shorter than the other leg pieces, and a gap portion 15 was formed between the tip surfaces of the leg pieces. Here, the broken line in FIG. 6 indicates a magnetic path. However, during assembly, the electromagnet 1' is fixed at a fixed position inside the casing 5, and then the mover 2 is inserted once into the gear lug portion 15 along the reciprocating direction of the mover 2, and then the mover 2 and the gear 7 are inserted. Work was now underway to connect it to Ram 3. After the mover 2 is inserted into the gap 15, the mover 2 and the Guia 7 ram are joined together, so that the permanent magnet 31 of the mover 2 is connected to the core 1.
There was a problem in that the parts were attracted to various parts of the 1.

In particular, in a small linear pump, a rare earth magnet with higher performance than a 7-piece light magnet is used as the permanent magnet 31 provided in the mover 2, but it is small and the gap portion 15 is narrow, and the magnetic force of the permanent magnet 31 is strong. , move the mover 2 to the core 11
There is a problem that it becomes more difficult to insert into the gap 15 of
When inserting the permanent magnet 3 into the gap 15 of the core 11
If the permanent magnet 31 collides forcefully with the core 11' with the attraction force of 1, the permanent magnet 31 may be broken.

[Object of the Invention] The present invention has been made in view of the above points, and its main purpose is to provide a structure that facilitates the insertion of a mover into the gear 7 section of the core. An object of the present invention is to provide a linear pump having the following features.

[Disclosure 1 (Structure)] The present invention includes an electromagnet configured by winding a coil around a core, a permanent magnet, and a rir disposed so as to be movable back and forth in the direction along the magnetic pole surface of the electromagnet. The mover and the Guia 7 ram fixed to the tip of the mover in the reciprocating direction are housed in a casing. In a linear pump that takes in and out the compression chamber enclosed between the Guia 7 ram and a part of the inner circumferential surface of the casing in accordance with the reciprocating motion of the mover, the core is not parallel to the reciprocating direction of the mover. A magnetic material is formed in a shape in which magnetic pole pieces protrude from the inner surfaces of both leg pieces of the double-legged body in substantially orthogonal planes, and a mover is inserted between the magnetic pole faces at the tips of both magnetic pole pieces. Disclosed is a linear pump having a structure in which a movable element is easily assembled.

(Example) As shown in No. 11, 1, the casing 5 includes a case body 21 with a U-shaped cross section that is open to the upper blade and side nozzle in ptS1, and a bottom plate that closes the upper opening of the case body 21. 22, a pair of diaphragm mounting plates 23 that support the Guia 7 ram 3 and close the side opening of the case body 21, which are made of an elastic material such as rubber; It is composed of a pair of compression cases 24 that form a compression chamber 4 between the die 77 and the ram 3. A portion of the compression case 24 that forms the compression chamber 4 is bulged outward, and an intake valve 25 and an exhaust valve 26 are provided in this bulged portion. An electromagnet 1 is disposed at a fixed position within the case body 11.

As shown in FIG. 2, the electromagnet 1 is composed of a core 11 made of an 8-layer iron core and a fill 3 wound around the core 11. The core 11 consists of a pair of core bodies 10, each core body 10 having a magnetic pole piece 14 around which a coil 12 is wound,
The yoke piece 16 is longer than the magnetic pole piece 14 and is parallel to the magnetic pole piece 14, and the connecting piece 17 integrally connects one end of the magnetic pole piece 14 and one end of the yoke piece 16, forming a substantially F-shape. ing. However, the core 11 is formed by joining the yoke pieces 16 of this F-shaped core cable body 10 so that their end surfaces abut against each other, and the magnetic pole piece 14 is formed shorter than the yoke piece 16. Because there is a magnetic pole piece 1
A gap portion 15 is formed at the opening of the magnetic pole face 13, which is the tip end face of the magnetic pole 4. That is, by connecting the core cords 10 of the -elbows, the core 11 as a whole is formed into a U-shaped body with magnetic pole pieces 14 protruding from the inner surfaces of both legs. Here, the reason why the core 11 is formed by combining a pair of core bodies 10 is due to the convenience of incorporating a pair of coils 12 attached to the magnetic pole pieces 14 of each core body 10. Both coils 12 are connected so that the opposing magnetic pole faces 13 have different polarities, and as the coils 12 are energized, one core body 1 is connected as shown by the broken line in FIG.
0 magnetic pole piece 14 → connection piece 17 → yoke piece 16 → yoke piece 16 of the other core element 10 → connection piece 17 → magnetic pole piece 1/I
A magnetic circuit is formed through the

The movable element 2 is inserted into the gap portion 15 . The mover 2 has a gap portion 1 when an alternating current is applied to the coil 12.
A pair of permanent magnets 31 are provided so as to reciprocate along both magnetic pole faces 13 in a direction substantially orthogonal to the plane containing the core 11 due to the interaction between the alternating magnetic field generated at the magnet 5 and the magnetic field of the permanent magnets 31. There is. The above-mentioned diaphragm 3 is connected to both ends of the mover 2 in the reciprocating direction, and the diaphragm 3 is displaced in its thickness direction as the I'If mover 2 reciprocates. In response to this displacement of the diaphragm 3, the compression chamber 4 is sucked and exhausted and operates as a pump.

When the electromagnet 1 and the mover 2 are housed in the casing 5, as shown in FIG. The core 11 is fixed at a fixed position in the casing 5 with the ends (opposite end) aligned with each other, and the mover 2 is inserted into the gap 15 from above in this state. In this way, the movable element 2 is inserted from a direction perpendicular to the reciprocating direction, and since the movable element 2 can be attached with the diaphragm 3 connected to the diaphragm 3 in advance, the movable element 2 can be inserted in the reciprocating direction as in the conventional case. Compared to the case where the movable element 2 is inserted into the gap part 15 and then connected to the diaphragm 3, the movable element 2 is less likely to be attracted to the core 11, and the workability is greatly improved.

In the above embodiment, the connecting piece 17 has a shape that protrudes toward the magnetic pole piece 14, but since this protruding portion has almost no function as a magnetic circuit, it is of course possible to omit it. be.

[Effects of the Invention] As described above, the present invention has a magnetic core having a shape in which magnetic pole pieces protrude from the inner surfaces of both leg pieces of a U-shaped body in a plane substantially perpendicular to the reciprocating direction of the mover. A gap is formed between the magnetic pole faces at the tips of both magnetic pole pieces, and the mover is inserted into the gap of the electromagnet. The movable element can be inserted into the gap from a direction perpendicular to its reciprocating direction. As a result, the mover can be installed with the mover connected to the diaphragm in advance, and compared to the conventional case where the mover is inserted into the gap from the reciprocating direction and then the Ilj mover is connected to the diaphragm. This has the advantage that fewer particles are adsorbed to the core, and the workability of assembly work is greatly improved.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing one embodiment of the present invention, Fig. 2 is a perspective view showing an electromagnet used in the same, Fig. 3 is an explanatory diagram of the operation of the electromagnet used in the same, and Fig. 14 is a conventional example. The sectional view shown, Pt55 is a perspective view showing the electromagnet used in the above,
FIG. 6 is an explanatory diagram of the operation of the electromagnet used in the above. 1 is an electromagnet, 2 is a mover, 3 is a diaphragm, 4 is a compression chamber, 5 is a casing, 11 is a core, 12 is a coil, 13
14 is a magnetic pole surface, 14 is a magnetic pole piece, 15 is a gap portion, 16 is a yoke piece, and 31 is a permanent magnet. Agent Patent Attorney Ishi +n Long 7 K

Claims (1)

[Claims] (1) An electromagnet configured by winding a coil around a core, a mover equipped with a permanent magnet and arranged to be able to reciprocate in the direction along the magnetic pole surface of the electromagnet, and a tip of the mover in the reciprocating direction. A fixed diaphragm is housed in a casing, and the inner periphery of the diaphragm and casing is moved as the mover reciprocates due to the magnetic interaction between the alternating magnetic field generated by passing an alternating current to the electromagnet and the permanent magnet. In a linear pump that takes in and out air from a compression chamber surrounded by a part of a surface, the core has magnetic poles on the inner surfaces of both legs of a U-shaped body in a plane that is approximately perpendicular to the reciprocating direction of the mover. A linear pump characterized in that the piece is formed of a magnetic material into a protruding shape, and a gap portion is formed between the magnetic pole faces at the tips of both magnetic pole pieces, into which a movable element is inserted.