JPS636877Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an output balancer used in an apparatus for simultaneously performing high-frequency induction heating on different shapes and sizes of one article or a plurality of articles.

As shown in Fig. 5, when parts a ₁ and a ₂ of different shapes and dimensions of one item a are simultaneously subjected to high-frequency induction heating while the item a is in a stationary state, the parts a _{1 and a 2 correspond to the parts a 1} and a ₂ . The work coils 4, 4 are prepared and connected to the current transformer 3. Specifically, there are two types of devices as shown in FIG. 4 (a) and (b). In the same figure, A shows the case where the work coils 4 and 4 are connected in series to the terminals of the output leads 2 _{and 3} of the secondary coil 2 ₂ of one current transformer 3 connected to the oscillator 1, and B shows the case where they are connected in parallel. . In either case, the problem here is the design of the work coils 4, 4. That is, the secondary coil 2
It is practically difficult to balance the ratio (turn ratio) between the number of turns of work coil 4 and the number of turns of work coil 4 for both coils 4 and 4 _, and it is usually left to the professional sense of experienced people, and technical reproduction is difficult. I had a flaw in my lack of sexuality. Therefore, we did not purposely adopt a device like the one shown in Figure 4, but instead replaced the separate work coils.
A two-stage heating device was implemented that separately heated two locations, a ₁ and a ₂ . Especially the shape of parts a ₁ and a ₂
When there is a significant difference in size, this two-stage method (or even a multi-stage method) is indispensable. If the difference in shape and dimensions is not as large as on the left, the device shown in Figure 4 can also be adopted, but in that case, the turn ratio described above should be designed with sufficient consideration given to the difference in diameter and surface area between points a ₁ and a ₂ . Both parts a ₁ , a ₂
It takes a high level of professional experience to create a work coil that does not exert a biased heating effect on either side, and even if successful, it not only requires the same cumbersome work for each different product. The results lacked repeatability.

As described above, in the conventional apparatus, it is difficult to simultaneously harden the plurality of parts having different shapes and dimensions, or even if it is possible, the problem remains that it is extremely troublesome and has poor productivity.

In view of the above, the present invention provides an output balancer that can efficiently and accurately heat a plurality of different heating locations using a single oscillator.

To explain the embodiment diagrams in detail below, Fig. 1 shows a circuit diagram of the entire high frequency induction heating device including the output inductor of the invention, Fig. 2 is a perspective view of the output balancer of the invention, and Fig. 3 is the same. FIG. 2 is a longitudinal cross-sectional view of a main part of a balancer. As shown in FIG. 1, the present invention connects a plurality of primary coils _{2 1} and 2 2 in series to the output lead 11 of one high-frequency oscillator 1, and connects each primary coil _{2 1 and} 2 ₂ to On the other hand, separate secondary coils 2 ₂ , 2 _{2 .} . . are paired to form a plurality of current transformers ₃ , 3 _. . . , and output leads 2 ₃ , 2 ₃ . Work coils 4, 4, which are suitable for each heating point...
In the high-frequency induction heating device in which the output leads 2 ₃ , 2 ₃ . . . Work coil 4, 4
This is designed to balance the heating caused by... As shown in FIGS. 2 and 3, this output balancer 5 is one side of the output lead 2 3 between the secondary coil 2 ₂ of the current transformer 3 and the article heating work coil ₄ connected to its terminal. By winding an output control inductor 6 in the middle and inserting a conductor part 7 into the inductor 6 so as to be able to move forward and backward, the output of the work coil 4 can be adjusted by partially changing the power sharing in the conductor part 7. This was done as if to force him to do so. As mentioned above, the induction heating device using the output balancer of the present invention has a plurality of independent current transformers 3, 3 connected in series to one oscillator 1, and each of the work coils 4, 4... A compatible conventional coil (e.g., as used in the two-stage heating method) is still used, and the output lead 2 of the secondary coil is
A feature is that output balancers 5, 5, . . . are interposed in order to balance the respective outputs of ₃ , 2 ₃ , . To explain in more detail below, first, the specific structure and function of the output balancer 5 are shown in FIG.
Referring to Figure 3, the output lead 2 ₃ in this example is made by combining two copper plates 2 ₃₀ and 2 ₃₀ with an insulating plate 8 between them, of which the copper plate on the front side in the figure A path ₆₀ made of a copper hollow cylinder for forming an output control inductor 6 is provided along the inner surface of the output control inductor 6. The output control inductor 6 is wound in the middle of this path 60, and the conductor portion 7 is inside the inductor 6. It is inserted so that it can move forward and backward in the longitudinal direction.
That is, as shown in the longitudinal sectional front view of FIG. 3, this conductor portion 7 has a hollow cylindrical shape as a whole, and the cooling water W can freely flow from the top to the bottom in the inner cavity, and corresponds to the inductor 6. The cylinder wall has three different structures from top to bottom, with a ferrite cylinder (a cylinder made of other ferromagnetic material) 71 at the top, a simple cavity 72 at the center, and a copper cylinder 73 at the bottom. The cylinder 71, the cavity 72 and the cylinder 7 of the conductor part 7 are arranged.
An insulating tube 9 such as a glass laminate tube, an epoxy tube, or a silica tube is fitted over the tube 3 for the purpose of electrical insulation and heat insulation. Brass cylinders 70, 70 are connected to the top and bottom of the conductor part 7, and an external thread 701 is provided on the outer periphery of the top brass cylinder 70.
As shown in the figure, the base plate 12 (electrical insulating material) mounted on the upper ends of the output lead copper plates 2 ₃ , 2 ₃ and fixed on the lead copper plates 2 ₃ by the mounting seats 10 , 10 is vertically connected to the inductor 6 . The key 13 provided on the base plate 112 is inserted into the base plate 112 so as to be freely advanced and retracted in the direction of the external screw 701.
A feed nut 15 that is adapted to a key groove 14 provided in a brass cylinder 70 having a diameter and screwed onto the external screw 701
The conductor portion 7 is held by the base plate 12. By operating the feed nut 15, the conductor portion 7 can move up and down within the output control inductor 6 while being guided and regulated by the key 13 and the key groove 14, and the ferrite corresponding to the inductor 6 can be moved up and down. Cylinder 71, cavity 72 and copper tube 7
The position of 3 causes a change in the partial power sharing among these. That is, in the above example, the ferrite tube 7
1 corresponds to the coil 6, the high frequency power of the inductor 6 is significantly consumed by the strong magnetic force of the ferrite tube 71 (reactive power increases), and the output at this time becomes the lowest. When the cavity 72 corresponds, the consumption will be reduced by the inductance loss, but the cylinder 71
consumption is lower than in the case of When the copper tube 73 is positioned, induction heating occurs in the tube 73 and it is consumed, but its power consumption is lower than that of the cavity 72. Therefore,
In this example, the output gradually increases in the order of cylinder 71, cavity 72, and cylinder 73. When the boundary between these three members is located, an intermediate relationship between the adjacent members is created. Therefore, the output can be varied by adjusting the position of the conductor section 7.
If the output at the position where 2 corresponds to the inductor 6 is zero, this output increases in the direction where the cylinder 73 is located and decreases in the direction of the cylinder 71. It goes without saying that the cooling water W to prevent the output balancer 5 from overheating is introduced into the conductor portion 7 continuously or intermittently.

By applying the output balancer 5 of the present invention as described above to the high frequency induction heating device, the first
Since the output of the output lead 2 ₃ of each current transformer 3 in the figure can be adjusted within the variable range of the balancer 5, the turn ratio of each secondary coil 2 ₂ is considered for this adjustable range. Since the tolerance range for errors in the coil design is widened, not only the design of the secondary coil becomes easier, but also the range of application of each work coil 4 is expanded. The output balancer can adjust the heating high-frequency power by a simple physical operation of raising and lowering the conductor within the inductor, so it has the advantage of not requiring expensive electrical or electronic devices. The invention provides excellent benefits in simultaneously hardening multiple locations with different shapes and dimensions.

[Brief explanation of the drawing]

Fig. 1 shows a circuit diagram of the entire high-frequency induction heating device including the output inductor of the invention, Fig. 2 is a perspective view of the output balancer of the invention, Fig. 3 is a vertical sectional view of the main parts of the balancer, and Fig. 4 is a FIG. 5 is a circuit diagram showing an outline of a conventional induction heating device of this kind. FIG. 5 shows a front view of an article to which the present invention is applied. Explanation of symbols, 1... High frequency oscillator, 11... Output lead, 12... Base plate, 21... Primary coil,
2 ₂ ...Secondary coil, 3...Current transformer,
2 ₃ ... Output lead, 2 ₃₀ ... Copper plate, 4 ... Work coil, 5 ... Output balancer, 6 ... Power control inductor, 60 ... Path, 7 ... Conductor part, 70
... Brass tube, 71 ... Ferrite tube, 72 ... Cavity part, 73 ... Copper tube, 8 ... Insulating plate, 9 ... Insulating tube, 10 ... Mounting seat, 11 ... Output lead, 12 ...base plate.

Claims (1)

[Scope of utility model registration request] A plurality of primary coils 2 ₁ , 2 _{1 .} . . are connected in series to the output lead ₁₁ of one high-frequency oscillator 1, and _a separate secondary coil 2 ₂ , 2 ₂ ... constitute a plurality of current transformers 3, 3..., and the secondary coils 2 ₂ ,
In a high-frequency induction heating device in which work coils _{4, 4... corresponding to respective heating points are connected to output cards 2 3 ,} 2 ₃ ... of 2 2..., these output leads 2
An output balancer 5 is inserted into one side of either of the work coils ₄ , 4 to balance the heating by the work coils 4, 4, and this balancer 5 is connected to the secondary coil ₂₂ of the current transformer 3 and its terminal _. An output control inductor 6 is wound in the middle of one side of the output lead 2 ₃ between the connected work coil 4 for heating the article, and a conductor part 7 is inserted into the inductor 6 so as to be freely retractable. An output balancer for high-frequency induction heating, which partially changes the power sharing and thereby adjusts or reduces the output of the work coil 4.