JPS5936804B2 - coil bobbin - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a coil bobbin, and its purpose is to safely and efficiently produce a coil to be attached to both legs of a π-shaped iron core of an ultrasonic vibrator or transformer. Provide coil bobbin 3.

Figure 1a shows the types of iron cores of magnetostrictive vibrators for generating ultrasonic waves.
There is an NA type shown in Figure 1b, and a π type shown in Figure 1b.The NA type holds the DC bypass magnet 1 and has both legs 2a.
, 2b have adhesive parts 3 on the top and bottom to connect them,
The π type is often used as a vibration source for powerful ultrasonic waves because it is only necessary to hold the DC bypass magnet 1 with adhesive tape 4.

Furthermore, unlike the NA type vibrator, the π type vibrator does not have a driving coil wound directly around the legs of the vibrator, but instead has a characteristic that the driving coil can be prepared in advance and inserted later. By the way, the driving coil of a magnetostrictive vibrator has a fixed winding method, and the two sets of driving coils 6a and 6b provided with the legs 2a and 2b VC on both sides of the vibrator 5 are wound so that the magnetic flux forms a closed loop within the vibrator 5. It must be wound as shown in Figure 2.

By the way, as shown in FIG. 2, since the two sets of coils 6a and 6b are connected in opposite winding methods, one wire always passes through the gap T between the legs 2a and 2b. However, in the past, the drive coils 6a and 6b of the vibrator 5, which are composed of an iron core such as a π-type ferrite core,
3, coils 6a and 6b wound around one coil bobbin Ta and Tb are created for each leg of the vibrator 5 as shown in FIG. 3, and after this creation, the coils 6a and 6b are electrically connected. was.

Therefore, in order to electrically connect both coils 6a and 6b, processes such as stripping the wire, soldering, and caulking are required, and when the vibrator 5 is used by being placed in water etc., insulation of the connection part becomes a problem. In addition, since the power supply is stripped and soldered or caulked, there is a risk that the connection may come into contact with metal parts such as the cleaning tank, especially in the case of small ultrasonic cleaners, It is extremely dangerous if the cleaning tank is not insulated, as people will have to insert their hands into the water to take out and take out the items to be cleaned.

The present invention has been provided in view of the above-mentioned drawbacks, and will be explained below with reference to Examples.

FIG. 4 shows one embodiment, in which two sets of coil bobbins 7
A, 7b are adjacent to each other in a state where they are stacked up and down, 8a,
One end of the two parts 8b are connected in series by a hinge 9 made of adhesive tape, and they are mutually rotatable 1800 degrees as shown in FIG. When the coils are attached to the coils 6a and 6b, they are wound continuously in the same direction around the two sets of coil bobbins 7A and 7b as shown in FIG. At this time, the power supply part 10 extending between both coil bobbins 7A and 7b is passed through the hinge 9 part as shown in FIG. When the coils 6a and 6b are arranged in parallel as shown in FIG. 5, the winding directions of the coils 6a and 6b wound around the coil bobbins 7A and 7b, that is, the magnetic flux direction, are opposite directions as shown in FIG. Here, each coil bobbin 7A,
The gap between the through holes 7b is
If the convergence of the collars 8a and 8b is set to be the same as the spacing of Child 5
It can be installed so that the magnetic flux direction can draw a closed loop. FIG. 8 shows another embodiment of the present invention, in which two hinges 9a, 9b are integrally formed with coil bobbins 7A, 7b, and a wire portion 1 spanning both coils 6a, 6b is shown.
0, three notches 11a, 11b, 11e are formed at the edges of the flanges 8a, 8b of both coil bobbins 7A, 7b provided with hinges 9a, 9b. , 7b, when winding the coils 6a, 6b in the same direction, insert the aforementioned electric wire portion 10 into the notches 11a, 11b, 11c in a VCS shape as shown in the figure, and rotate the coil bobbins 6a, 6b by 180S. An allowance is made for the length of the above-mentioned electric wire portion 10 that corresponds to the wire. FIG. 9 shows another embodiment of the present invention, in which a projection 12 is provided on the upper surface of a flange 8a on a coil bobbin 7a.
, 12... are formed on the collar 8b of the coil bobbin 7b having the same shape at the same position as the protrusions 12, 12... on the lower collar portion 8a''.
Insertion holes 13, 13, . 7b to the projections 12, 12... and the hole 13.
, 13, . . . are connected and coupled, and the coils 6a and 6b are wound in the same manner as in the above embodiment.

After this winding, the upper coil bobbin 7a and the lower coil bobbin 7b are uncoupled, and one coil bobbin 7a is
The coil bobbins 7A and 7b are placed side by side by 180 rotations with respect to the other coil bobbin 7b, and the legs 2a and 2 of the π-type magnetostrictive vibrator 5 are inserted into the through holes of these coil bobbins 7A and 7b.
When b is inserted, the magnetic flux will draw a closed loop within the vibrator 5. In addition, when the number of series vibrators is large, coil bobbins 7A, 7b, . To the other end, coils 6a, 6
Wind the coil bobbins 7A, 7b... in the same direction, and after winding is finished, remove the coupling between the coil bobbins 7A, 7b... so that the relationship between the alternate coil bobbins 7A, 7b... is a 180 degree rotation. The legs 7a, 7b of each vibrator 5 are attached to the corresponding coil bobbins 7A, 7b...
It is recommended to insert . In this case, in order to make the magnetic fluxes of the vibrators 5 in the same direction as shown in FIGS. 11A and 11B, the vibrators 5 may be inserted from the same positions of the legs 2a and 2b of the vibrators 5. The present invention is equipped with a connecting means that connects two sets of coil bobbins attached to both legs of a π-shaped iron core in series, and one coil bobbin is connected to the other coil bobbin by 1800 degrees from the other coil bobbin. Since the connecting means is set to be rotatable in a rotated state, when winding the coils, simply wind the coils in a serially connected state, and then rotate one coil bobbin 1800 revolutions.
The winding direction of both coils can be set in a direction that allows the magnetic flux of the coils attached to both legs of the π-shaped iron core to form a closed loop, and the coil installation work can be done by winding left-handed or right-handed as in the past. It becomes easier because there is no need to sort,
Moreover, unlike conventional methods, the connection between the two coils does not require soldering or caulking, and there is no need to strip the coating, so there is no need for special insulation and it is safe, especially with vibrations caused by ultrasonic cleaners. When used in a cleaning tank, it has the advantage that cleaning items can be safely taken in and out of the cleaning tank, and there is no risk of electric shock even when the vibrator is inserted into the cleaning tank.

[Brief explanation of drawings]

Figures 1A and b are front views of the iron core of the ultrasonic reduction transducer, Figure 2 is an explanatory diagram of the conventional coil winding method, Figure 3 is an exploded perspective view of the same, and Figure 4 is the invention of the present invention. FIG. 5 is a perspective view of the coil bobbins of the above embodiment arranged in series; FIG. 5 is a perspective view of the coil bobbins of the above embodiment arranged in parallel; FIGS. FIG. 9 is a perspective view of a coil bobbin according to another embodiment of the present invention; FIG. 10 is a reduced front view of the same coil bobbin as described above; FIGS. 11A and b is the same explanatory diagram as above, 5 is a vibrator, 6a, 6b are coils, 7a, 7
b is a coil bobbin.

Claims (1)

[Scope of Claims] 1. In two sets of coil bobbins for winding a coil that is attached to both legs of a substantially π-shaped iron core and generates a closed loop magnetic flux, the two sets of coil bobbins are connected to each other in series. A coil bobbin comprising a connecting means, and the connecting means is set so that both coil bobbins can rotate from a serially connected state to a state where one coil bobbin is rotated by 180 degrees with respect to the other coil bobbin. 2. The coil bobbin according to claim 1, wherein the connecting means for connecting the two sets of coil bobbins is constituted by a hinge. 3. A projection is provided on the collar of one coil bobbin, and a hole is formed in the collar of the other coil bobbin to allow the projection to be inserted in a detachable manner, and these projections and the hole constitute a connecting means. A coil bobbin according to claim 1.