JPH0545826Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Technical field] The present invention relates to the structure of a movable body of an electromagnetic drive device such as an electromagnetic pump, and more specifically, to prevent eddy current from occurring in a metal movable body frame that holds a permanent magnet. However, the present invention relates to a technique for preventing a decrease in strength of a movable body frame. [Background technology] Conventionally, alternating current excited electromagnets are fixed facing each other in a casing, a movable body having a permanent magnet is arranged between the opposing magnetic poles of the electromagnet, diaphragms are attached to the shafts at both ends of the movable body, and the coil of the electromagnet is In an electromagnetic pump, which is an example of an electromagnetic drive device that reciprocates a movable body by the magnetic force generated by applying an alternating current to the diaphragm and discharges pressurized fluid by the reciprocating motion of a diaphragm, when the lines of magnetic force caused by the alternating current pass through a permanent magnet, As shown in FIGS. 9 and 10, eddy currents C are generated in the metal movable frame, causing problems of increased temperature and increased power consumption. In FIG. 9, b indicates a magnetic path (magnetic flux). To solve this problem, as shown in Figure 11,
There is a method of providing the slit 2a in the movable body frame 1. Incidentally, by inserting the slit 2a in the movable body frame 1 in this way, eddy currents can be blocked, but since a tensile force is applied to the shaft 3 protruding from the movable body frame 1, the repeated stress caused by reciprocating drive causes the eddy current to be cut off from the slit 2a. There is a problem that the movable body frame 1 is destroyed. [Purpose of the invention] The present invention was made in view of the above problems, and its purpose is to prevent the generation of eddy currents in the movable frame, but also to prevent the occurrence of eddy currents in the movable frame. An object of the present invention is to provide a structure of a movable body of an electromagnetic drive device that can prevent a decrease in strength. [Disclosure of the invention] The structure of the movable body of the electromagnetic drive device of the present invention includes a side frame portion of a metal movable body frame 1 that holds a permanent magnet 4 and is movable back and forth by the magnetic force of an electromagnet that is excited by AC. 20 is provided with a shaft 3 that projects outward and holds the diaphragm 9, a slit 2 that communicates with the inside and outside of the side frame portion 20 is formed, and in the inner part of the slit 2, the shaft side of the side frame portion 20 is formed. A pressed part A is formed in the pressed part A, a pressed part B is formed in the side frame part 20 facing the pressed part A with the slit 2 in between, and the slit 2 is filled with an adhesive 5. With this configuration, the above object has been achieved. In other words, by forming the slits 2 in the movable body frame 1, generation of eddy currents in the movable body frame 1 can be avoided, but the side frame portions 2
A slit 2 that communicates with the inside and outside is formed, and in the inner part of the slit 2, a pressed portion A is formed on the shaft side portion of the side frame portion 20, and the pressed portion A is opposed to the pressed portion A with the slit 2 interposed therebetween. By forming the holding part B on the side frame part 20 and filling the slit 2 with the adhesive 5, even though the slit 2 is formed, the shaft side part 1a of the movable frame 1 having the shaft 3 can be It is possible to suppress the frame from protruding outward, and it is possible to obtain a frame strength substantially equivalent to that without the slit 2. Embodiments of the present invention will be described in detail below based on the drawings. The electromagnetic pump P has an electromagnet 7 fixed to a casing 6 facing each other, a movable body 8 having a permanent magnet 4 arranged between opposing magnetic poles of the electromagnet 7, diaphragms 9 provided at both ends of the movable body 8, and a central case 10. The diaphragms 9, 9 are mounted between the side cases 11, 11, and the movable body 8 is reciprocally driven by the magnetic force generated by energizing the coil of the electromagnet 7. Outside air is sucked into the suction compression chamber 14 from the suction chamber 12 communicating with it via the suction valve 13, and by the double movement of the diaphragm 9, pressurized air is drawn from the suction compression chamber 14 through the discharge valve 15 and into the discharge chamber 16. Through the outlet 17
It is constructed so that it can be discharged from. An electromagnet 7 is constructed by winding a coil around a coil bobbin through which an iron core 18 passes, and a pair of such electromagnets 7 are opposed to each other with a vibration path in between. The winding directions of the coils of these pair of electromagnets 7 are opposite to each other. Then, in the vibration path, the movable body 8 supporting the permanent magnets 4, 4 is connected to the movable body frame 1 via the shaft 3 to the diaphragm 9,
By applying an alternating current to the electromagnet 7, the movable body 8 can be moved back and forth, and the diaphragms 9 can be driven back and forth. As shown in FIG. 1, a pair of through holes 19 are formed in the metal movable body frame 1 of the movable body 8. As shown in FIG. A permanent magnet 4 of approximately the same size as the through hole 19 is passed through the through hole 19 and attached with an adhesive 5. Slits 2 are provided in side frame portions 20 on both sides of the movable body frame 1 in the movable direction.
The direction of the slit 2 is set in such a direction that the shaft side portion 1a of the movable body frame 1 having the shaft 3 is prevented from protruding outward by the abutment of the opposing wall of the slit 2. That is, in the inner part of the slit 2, a pressed part A is formed on the shaft side part of the side frame part 20, and the slit 2 is formed in this pressed part A.
A pressing portion B is formed on the side frame portions 20 facing each other with the holding portion B interposed therebetween. Adhesive 5 to slit 2
It is filled with. By forming the slits 2 in the movable frame 1 in this way, generation of eddy currents in the movable frame 1 can be avoided, and the direction of the slits 2 can be adjusted in the direction of the movable frame 1 having the shaft 3. It can be said that the slit 2 is formed by setting the slit 2 in such a direction that the protrusion of the shaft side portion 1a toward the outside is suppressed by the contact between the opposing walls of the slit 2, and by filling the slit 2 with the adhesive 5. This makes it possible to prevent the shaft side portion 1a of the movable body frame 1 having the shaft 3 from protruding outward, and to obtain a frame strength substantially equivalent to that without the slit 2. As shown in FIG. 1, the shape of the slit 2 is such that the direction of the slit 2 is slanted so that the further inward from the outer end of the movable frame 1, the further away from the shaft 3 protruding outward from the movable frame 1. It is set as. In such a case, it is preferable that the slope of slit 2 be steeper.

[Table] On the other hand, the path of the eddy current c is blocked by the slit 2 as shown in FIG. 3, so it does not occur. 6 and 7 respectively show other embodiments of the slit 2, such as a stepped shape as shown in FIG. 6 or an arc shape as shown in FIG.
The shape of can be modified in various ways. In short, in the inner part of the slit 2, the side frame portion 2
It is only necessary that a pressed portion A is formed on the shaft side portion of the 0, and a pressed portion B is formed on the side frame portion 20 facing the pressed portion A with the slit 2 in between. [Effects of the invention] In summary, the present invention has a slit formed in the movable body frame, which avoids the generation of eddy currents in the movable body frame, but also allows communication between the inside and outside of the side frame portions. A slit is formed, a pressed part is formed on the shaft side part of the side frame part in the inner part of the slit, and a pressed part is formed in the side frame part opposite to the pressed part with the slit in between, Since the slit is filled with adhesive, even if the slit is formed, the shaft side portion of the movable body frame having the shaft can be prevented from protruding outward. It has the advantage that it is possible to obtain frame strength that is approximately the same as that without.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the movable body of the present invention;
Fig. 2 is a partially enlarged front view of the movable body same as above, Fig. 3 is a front view showing the action of the same as above, Figs. Figures 6 and 7 are front views showing other embodiments of the same slit as above, Figure 8 is a perspective view showing the relationship between the movable body and the permanent magnet in the conventional example, and Figure 9 shows that the magnetic flux of the electromagnet is Explanatory diagram showing the effect of penetrating the 1st
Figure 0 is an explanatory diagram showing the effect of the eddy current as above,
Fig. 11 is a perspective view of the movable body same as above, and Fig. 12 is a front view of the same as above, in which 1 is a movable body frame, 2 is a slit, 3 is a shaft, 4 is a permanent magnet, 5 is an adhesive, and A
is the pressed part, and B is the pressed part.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A metal movable frame that holds a permanent magnet and is movable back and forth by the magnetic force of an electromagnet that is excited by alternating current. A holding shaft is provided, a slit that communicates with the inside and outside is formed in the side frame part, and a held part is formed on the shaft side part of the side frame part at the inner part of the slit, and the slit is formed in this held part. A structure of a movable body of an electromagnetic drive device, characterized in that a holding part is formed on opposing side frame parts, and a slit is filled with an adhesive. (2) Utility model registration claim 1, in which the direction of the slit is inclined so that the further inward from the outer end of the side frame portion, the further away from the axis protruding outward from the side frame portion. Structure of a movable body of the described electromagnetic drive device.