JP4838783B2 - Electromagnetic relay for IH cooking heater - Google Patents

Description

  The present invention relates to an electromagnetic relay for an IH cooking heater, and more particularly to an electromagnetic relay for an IH cooking heater that generates heat in a cooking pot by electromagnetic induction by a high-frequency current.

  In recent years, IH (electromagnetic induction) cooking heaters that generate heat from cooking pots made of conductors have become widespread in heating cookers, and aluminum, iron, copper, or stainless steel is generally used as a material for the cooking pots. The IH cooking heater generates an eddy current in the cooking pan by an electromagnetic induction action by an alternating magnetic field to generate heat in the cooking pan. A small electromagnetic relay is incorporated in the control circuit of the IH cooking heater. .

  A configuration example of a conventional electromagnetic relay for this type of IH cooking heater is shown in FIGS. The electromagnetic relay includes an insulating base 1 formed by molding, and a case cover 2 that covers the upper surface side of the insulating base 1, and includes a rear side portion and a front side portion of the insulating base 1 (FIG. 5). Are formed with an electromagnetic drive block portion E1 and a contact opening / closing block portion E2, respectively.

  The electromagnetic drive block E1 includes a coil 4 wound around a bobbin (not shown) with an iron core 3 disposed in the center, and a yoke erected in front of the coil 4 (to the right in FIG. 5). 5, an armature 6 having a L-shaped vertical section in which the rear end side horizontal portion 6 a is locked to the upper end portion 5 a of the yoke 5, and rotates with the locking portion 6 b as a rotation fulcrum, and the armature 6 is provided with an insulating card 7 that abuts the rear end portion 7a on the front surface of the vertical portion 6c and moves back and forth in conjunction with the rotation of the armature 6.

  Further, as shown in FIG. 6, the contact opening / closing block portion E 2 has an inverted L-shaped movable contact terminal 9 erected on the insulating base 1 and an upper end portion on the upper end side horizontal portion 9 a of the movable contact terminal 9. A conductive contact spring (plate spring) 10 fixed by fixing means 16, 16 such as caulking and rotating in conjunction with the back and forth movement of the insulating card 7, and a central portion in the left-right direction of the contact spring 10 A movable contact piece (movable spring) 11 having an inverted square shape (including a U shape, the same applies hereinafter) 11 formed through a slit 8 and a fixed contact piece 12 arranged in front of the movable contact piece 11. The fixed contact 13 and the movable contact 14 disposed so as to face the upper end portions of the fixed contact piece 12 and the movable contact piece 11, respectively, and the lower portion of the fixed contact piece 12 are integrally connected. And a fixed contact terminal 15.

  And the front-end | tip of the front end side horizontal part 7b of the insulation card | curd 7 is connected with the lower part of the said movable contact piece 11. FIG. Therefore, when the armature 6 rotates in the front-rear direction, the insulating card 7 moves in the front-rear direction, and the movable contact piece 11 rotates in the front-rear direction.

  According to the electromagnetic relay, when the energization to the coil 4 is turned on or off, the iron core 3 attracts or repels the rear end side horizontal portion 6a of the armature 6 (by the restoring force of the return spring), The armature 6 is rotated in the front-rear direction. Then, the insulating card 7 is moved in the front-rear direction by the vertical portion 6 c of the armature 6.

Further, the movable contact piece 11 is rotated in the front-rear direction by the movement of the insulating card 7 in the front-rear direction, and accordingly, the movable contact 14 of the movable contact piece 11 is fixed to the fixed contact 13 of the fixed contact piece 12. Touch or leave. Thus, the contact circuit of the IH cooking heater is controlled to open and close (see, for example, Patent Documents 1 and 2).
Japanese Utility Model Publication No. 2-79543 Japanese Utility Model Publication No. 2-79544

  In the electromagnetic relay having the conventional structure, when the cooking pan is heated by the IH cooking heater, in order to increase the heating efficiency of the cooking pan, a large eddy current is passed through the cooking pan and the cooking pan with respect to the heating surface of the IH cooking heater is used. It is necessary to form a wide contact area.

  Further, in order to quickly heat the cooking pan to a predetermined temperature, a high voltage, for example, 6000 volts must be applied to the contact circuit. In this case, since a high voltage is applied between the movable contact and the fixed contact, it is necessary to ensure a high withstand voltage at the contact point to cope with this. In order to ensure a high withstand voltage in the conventional electromagnetic relay, for example, an insulation distance between the contact spring and the fixed contact terminal (reference numeral L1 in FIG. 6) and an insulation distance between the movable contact and the fixed contact (see FIG. The length L2) in FIG. 5 may be lengthened, but such a configuration is impossible with a conventional electromagnetic relay. The reason will be described below.

  First, with respect to the insulation distance L1 between the contact spring and the fixed contact terminal, the mounting position of the fixed contact terminal with respect to the insulation base is determined by the specification standard, and the width dimension of both side portions of the contact spring is a predetermined energization. It cannot be formed narrow from the viewpoint of securing the capacity. Therefore, it is difficult to increase the insulation distance L1 in the electromagnetic relay having the conventional structure.

  Next, regarding the insulation distance (contact gap) L2 between the movable contact and the fixed contact, when the insulation distance L2 is increased, the gap between the coil core and the armature is increased accordingly. Therefore, it is necessary to increase the operating voltage to the coil in order to increase the attractive force with respect to the armature. Furthermore, since the rotation distance when the movable contact piece is opened and closed increases, a large repetitive stress acts on the movable contact piece accordingly, and the movable contact piece is easily broken. Therefore, it is difficult to increase the insulation distance L2 in the electromagnetic relay having the conventional structure.

  As described above, in the conventional electromagnetic relay, the insulation distances L1 and L2 cannot be set long, so that a high withstand voltage cannot be ensured. In addition, when a high voltage is applied between the movable contact and the fixed contact, an arc discharge occurs between the movable contact and the fixed contact, which damages or breaks the contact portion, and reduces the function or function of the IH cooking heater. There is a risk of stopping.

  Therefore, a high withstand voltage can be ensured without causing arc discharge at the contact point, and a technical problem to be solved in order to quickly heat the cooking pan to a predetermined temperature arises. The purpose is to solve.

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is directed to an armature that rotates back and forth in response to on / off of energization of the coil, and to follow the armature's back and forth rotation. provided by the dynamic insulating card back and forth, and the movable contact and the fixed contact that disconnects in conjunction with the forward and backward movements of the insulating card, moving contact and fixed contact and a movable contact piece and fixed contact piece mounted respectively an electromagnetic relay for cooking heater which is formed in the insulating base,
The movable contact piece is formed in a horizontally long shape, and the first movable contact and the second movable contact are formed separately from each other at the left and right ends of the movable contact piece,
The first fixed contact and the second fixed contact are disposed so as to be connected to and disconnected from the first movable contact and the second movable contact, respectively, and the first fixed contact and the second fixed contact are the first fixed contact and the second fixed contact. Provided at the upper end of the contact piece,
The first movable contact and the second movable contact are respectively connected to the first fixed contact and the second fixed contact to open and close the contact circuit of the cooking heater; and the first fixed contact and the second fixed contact; In the electromagnetic relay for an IH cooking heater in which the insulation distance between the first movable contact and the second movable contact facing each other is made large ,
The movable contact piece is attached to a leaf spring portion to which a front end portion of the insulation card is connected, and the leaf spring portion is a lateral width of a plate-like contact spring whose upper end portion is fixed to a rising portion of the insulation base. The center part of the direction is formed by cutting out in an inverted square shape, and the insulation distance (L1) between the contact spring and the first fixed contact piece and the second fixed contact piece can be increased. An electromagnetic relay for an IH cooking heater is provided.

  According to this configuration, when the armature rotates forward by energizing the coil, the insulating card moves forward. Then, in conjunction with the forward movement of the insulating card, the movable contact piece rotates to approach the first fixed contact piece and the second fixed contact piece, and the first movable contact and the second fixed contact move to the first movable contact. The contact and the second movable contact come into contact with each other to close the contact circuit. Therefore, since the present invention employs a double contact structure, the withstand voltage at the two contact points is doubled (insulation distance L2 × 2) compared to the conventional single contact structure.

  According to this configuration, the leaf spring portion to which the front end portion of the insulating card is connected is formed by cutting out the center portion in the left-right width direction of the contact spring in a reverse square shape, and a movable contact piece on the leaf spring portion. Is attached. Accordingly, when the insulating card moves forward, the first movable contact and the second movable contact provided on the movable contact piece come into contact with the first fixed contact piece and the second fixed contact piece, respectively, thereby closing the contact circuit. In this case, no current flows through the contact spring. Therefore, it is not necessary to form the width dimension of both side parts sandwiching the leaf spring part of the contact spring so as to ensure a predetermined energization capacity as in the prior art.

According to a second aspect of the present invention, the movable contact piece is attached to an upper end portion of the leaf spring portion in the horizontal direction, and an insulation distance between the movable contact piece and the first fixed contact terminal and the second fixed contact terminal ( increasing the L3) to provide a IH cooking electromagnetic relay for according to claim 1, wherein comprising configured to allow.

  According to this configuration, since the movable contact piece is attached to the upper end portion of the leaf spring portion in the horizontal direction, the insulation distance between the horizontal portion of the movable contact piece and the first fixed contact terminal and the second fixed contact terminal. (Refer to symbol L3 in FIG. 2) becomes longer.

  The invention according to claim 1 employs a double contact structure, so that the withstand voltage of the two contact points is doubled compared to the conventional case, so that a higher voltage (eg, 6000 volts or more) than the conventional example. Therefore, the cooking pan (heating plate for cooking such as a frying pan) can be heated to a predetermined temperature in a short time. At that time, since arc discharge does not occur at the contact point, there is no possibility of damaging or breaking the contact point, and it is possible to prevent the IH cooking heater from being degraded or stopped.

  Further, since it is not necessary to increase the contact gap at each contact point (see symbol L2 in FIG. 1), durability, reliability, contact stability or switching response at the contact point is improved. It is not necessary to increase the operating voltage, and since a large repetitive stress does not act on the movable contact piece, there is no possibility that the movable contact piece will break.

Soshiteko the invention, it is possible to narrower the width of each side portion of the contact spring, in addition to the above effects, the contact springs and the insulation distance between the first fixed contact piece and the second stationary contact piece ( The reference voltage L1 in FIG. 3) can be lengthened, and the withstand voltage between the contact spring and each of the fixed contact pieces can be increased accordingly.

According to a second aspect of the invention, since the horizontal portion and the insulation distance between the first fixed contact terminal and the second fixed contact terminal of the movable contact piece (L3) is long, in addition to the effects of the invention, that amount Thus, the withstand voltage between the movable contact piece and each of the fixed contact terminals can be increased.

  According to the present invention, in order to achieve a purpose of ensuring a high withstand voltage without causing arc discharge at the contact point and quickly heating the cooking pot of the cooking heater to a predetermined temperature, according to on / off of energization to the coil. An armature that rotates back and forth, an insulating card that moves back and forth following the back and forth rotation of the armature, a movable contact and a fixed contact that connect and disconnect in conjunction with the back and forth movement of the insulating card, and the movable contact and the fixed contact In an electromagnetic relay for a cooking heater provided with a movable contact piece and a fixed contact piece respectively attached, the movable contact piece is formed in a horizontally long shape, and a first movable contact and a second contact are formed at both left and right ends of the movable contact piece. The movable contact is formed separately from each other, the first fixed contact and the second fixed contact are arranged so as to be connected to and disconnected from the first movable contact and the second movable contact, respectively, and the first fixed contact And the second fixed contact are provided at the upper ends of the first fixed contact piece and the second fixed contact piece, respectively, and the first movable contact and the second movable contact are respectively connected to the first fixed contact and the second fixed contact. This was realized by opening and closing the contact circuit of the cooking heater.

  A preferred embodiment of the present invention will be described below with reference to FIGS. This embodiment is applied to a one-circuit two-contact gap type electromagnetic relay incorporated in a control circuit (contact circuit) of a cooking heater to which a high-frequency high voltage is applied, and is a first one provided on a movable contact piece. The movable contact and the second movable contact are configured to be connected to the first fixed contact and the second fixed contact, respectively, and the movable contact piece is attached to a reverse spring-shaped plate spring portion formed on a plate-shaped contact spring. However, the contact spring may be made of an elastic material and is not necessarily limited to a metal material.

  1 is a plan view of the electromagnetic relay of the present invention, FIG. 2 is a front sectional view of FIG. 1, FIG. 3 is a right side view of FIG. 1, and FIG. 4 is a side view showing a mounting portion of the movable contact piece according to the present invention. is there. The same components as those of the electromagnetic relay shown in FIGS. 5 to 7 will be described with the same reference numerals.

  In the figure, 17 is an electromagnetic relay for a one-circuit, two-contact gap type cooking heater. The electromagnetic relay 17 covers the insulating base 1 formed by molding and the upper surface side of the insulating base 1. And a case cover 2. An electromagnetic drive block portion E1 and a contact opening / closing block portion E2 are formed on the rear side portion and the front side portion (left side portion and right side portion in FIG. 2) of the insulating base 1, respectively.

  The electromagnetic drive block E1 formed on the rear side of the insulating base 1 includes an iron core 3 disposed on the rear side of the insulating base 1, and a bobbin (not shown) with the iron core 3 disposed in the center. A coil 4 wound around the coil 4, a yoke 5 erected in front of the coil 4, and an armature 6 having an L-shaped longitudinal section in which a horizontal portion 6 a is locked in the vicinity of the upper end portion 5 a of the yoke 5. It has.

  The armature 6 is provided such that it can be pivoted back and forth with the locking portion 6b as a pivot. The rear end portion 7a of the insulating card 7 abuts in front of the vertical portion 6c of the armature 6, and the insulating card 7 is configured to reciprocate in the front-rear direction in conjunction with the rotation operation of the armature 6.

  On the other hand, in the contact opening / closing block portion E2 formed on the front side portion of the insulating base 1, base studs 19 and 19 are erected on both the left and right sides of the insulating base 1, as shown in FIG. An upper end side horizontal portion 20a of a substantially T-shaped contact spring 20 is fixed to the base studs 19 and 19, and the contact spring 20 is formed of an elastic body. Further, a narrow vertical portion (vertical piece) 20b is formed to hang down at the middle portion in the left-right direction of the horizontal portion 20a of the contact spring 20.

  A leaf spring portion 26 is formed in the vertical portion 20 b of the contact spring 20 via a reverse-shaped slit 18. A front end horizontal portion 7 b formed on the insulating card 7 is connected to the lower portion of the leaf spring portion 26. A movable contact piece 21 is attached to the upper end of the leaf spring portion 26 in the horizontal direction by a fixing means 27 such as caulking. The movable contact piece 21 is made of a conductive material and is formed in a horizontally long rectangular shape. Furthermore, the first movable contact 24 </ b> A and the second movable contact 24 </ b> B are separately formed on the front surfaces of the left and right ends of the movable contact piece 21.

  Therefore, when the leaf spring portion 26 is rotated in the front-rear direction by using the lower end portion as a rotation fulcrum by the back-and-forth movement of the insulating card 7, the movable contact piece 21 attached to the upper portion of the leaf spring portion 26 is also rotated in the front-rear direction. To do.

  In addition, a first fixed contact 23A and a second fixed contact 23B are disposed in front of the first movable contact 24A and the second movable contact 24B, respectively, and the first fixed contact 23A and the second fixed contact 23B are The movable contact piece 21 is configured to come into contact with the first movable contact 24A and the second movable contact 24B by rotating forward. The first movable contact 24A and the second movable contact 24B are connected to the first fixed contact 23A and the second fixed contact 23B, respectively, so that the contact circuit of the cooking heater is opened and closed.

  Further, the first fixed contact 23A and the second fixed contact 23B are provided on the rear surfaces of the upper ends of the first fixed contact piece 22A and the second fixed contact piece 22B, respectively. Further, the first fixed contact piece 22A and the second fixed contact piece 22B are formed of the same parts as the first fixed contact terminal 25A and the second fixed contact terminal 25B, respectively, but should not be limited to these. It may be formed by a separate part. Further, as shown in FIG. 3, the first fixed contact terminal 25A and the second fixed contact terminal 25B are planted to be separated from each other by a predetermined dimension on both the left and right sides of the insulating base 1. In addition, C surface or R surface is formed in the corner | angular part of 25 A of 1st fixed contact terminals, and the 2nd fixed contact terminal 25B, in order to improve the discharge prevention effect.

  The electromagnetic relay 17 turns on or off the energization of the coil 4 so that the iron core 3 attracts or repels the rear end side horizontal portion 6a of the armature 6 (by the force of the return spring 6S). The armature 6 rotates in the front-rear direction. Then, the insulating card 7 is moved in the front-rear direction by the vertical portion 6 c of the armature 6.

  Further, when the insulating card 7 is moved in the front-rear direction, the leaf spring portion 26 is rotated in the front-rear direction, and the movable contact piece 21 is also rotated in the front-rear direction together with the leaf spring portion 26. For this reason, the first movable contact 24A and the second movable contact 24B attached to the left and right ends of the movable contact piece 21 simultaneously contact with or separate from the first fixed contact 23A and the second fixed contact 23B, and thereby the IH cooking heater. The contact circuit is controlled to open and close.

  The electromagnetic relay 17 has a high withstand voltage at three locations where a high voltage is applied. The three locations are a location (insulation distance L1) between the contact spring 20 and the upper inner surface of the first and second fixed contact terminals 25A and 25B, and the first and second movable contacts 24A and 24B and the first, It is a location (insulation distance L2) between the second fixed contacts 23A and 23B and a location (insulation distance L3) between the movable contact piece 21 and the first and second fixed contact terminals 25A and 25B.

  First, regarding the location (insulation distance L1) between the contact spring 20 and the upper inner surface of the first and second fixed contact terminals 25A and 25B, the contact spring 20 and the first and second fixed contact terminals 25A and 25B are Since they are arranged separately from each other, a large insulating effect can be obtained.

  Further, the movable contact piece 21 is attached to a reverse spring-shaped leaf spring portion 26 formed on the contact spring 20, and the first movable contact 24 </ b> A and the second movable contact 24 </ b> B are disposed on the left and right ends of the movable contact piece 21. Therefore, no current flows through the contact spring 20. Therefore, it is not necessary to widen the width dimensions of the two side portions 20c, 20c of the contact spring 20 in order to ensure a predetermined energization capacity. That is, unlike the conventional structure, the widths of the side portions 20c and 20c of the contact spring 20 can be narrowed, so that the insulation distance between the contact spring 20 and the first and second fixed contact terminals 25A and 25B. L1 can be set long, and the withstand voltage at the corresponding portion increases accordingly.

  Next, in the present invention, the first and second movable contacts 24A and 24B between the first and second movable contacts 24A and 24B and the first and second fixed contacts 23A and 23B (insulation distance L2) are used in the present invention. A double contact structure is employed in which the first and second fixed contacts 23A and 23B are simultaneously connected and disconnected. For this reason, even if the conventional contact gap (contact movement amount) is maintained (actually, the contact gap is somewhat larger), the total contact gap is substantially doubled. Therefore, according to the double contact structure of the present invention, the withstand voltage between the first and second movable contacts 24A and 24B and the first and second fixed contacts 23A and 23B is 2 as compared with the conventional single contact structure. Double up.

  The movable contact piece 21 is attached to the upper end portion of the leaf spring portion 26 in the horizontal direction at a location (insulation distance L3) between the movable contact piece 21 and the first and second fixed contact terminals 25A and 25B. Therefore, the insulation distance L3 between the lower side portion of the movable contact piece 21 and the upper surfaces of the first and second fixed contact terminals 25A and 25B is increased. Accordingly, the withstand voltage between the movable contact piece 21 and the first and second fixed contact terminals 25A and 25B increases accordingly.

  A high frequency high voltage (for example, 6000 volts) is applied to the IH cooking heater, but in the case of a high frequency high voltage, corona discharge may occur through the resin base stud 19. In this regard, since the air portion (gap) AL having a dielectric constant lower than that of the resin is provided between the base stud 19 and the contact spring 20, the occurrence of the corona discharge can be prevented in advance.

  As described above, according to this embodiment, the contact spring is held by the base stud erected on the insulating base and the double contact structure is adopted for the contact point, so that the withstand voltage at each contact point is higher than that of the conventional case. Greatly improved. Therefore, since a high voltage can be applied to the contact point, the cooking pan can be quickly heated to a predetermined temperature by the IH cooking heater according to the present invention. At that time, since no arc discharge is generated at the contact point, there is no possibility of damaging or breaking the contact point, and it is possible to reliably prevent the IH cooking heater from being degraded or stopped.

  In addition, since the present invention does not require an increase in the contact gap, it is necessary to improve the contact stability or switching response between the movable contact and the fixed contact at the contact point and to increase the operating voltage to the coil. Absent. Moreover, since a large repetitive stress does not act on the movable contact piece, there is no fear that the movable contact piece will break for a long time, and the durability and reliability of the movable contact piece are remarkably improved.

  The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified one.

The top view of an electromagnetic relay which shows one Example of this invention. Front sectional drawing of an electromagnetic relay same as the above. The right view of an electromagnetic relay same as the above. Explanatory drawing which shows the attachment part of the movable contact piece which concerns on this invention. The front sectional view of an electromagnetic relay which shows a conventional example. The right view of FIG. Explanatory drawing which shows the attachment part of the movable contact piece which concerns on a prior art example.

Explanation of symbols

1 Insulating Base 4 Coil 5 Yoke 6 Armature 7 Insulating Card 17 Electromagnetic Relay 19 Base Stud 20 Contact Spring 21 Movable Contact 22A First Fixed Contact 22B Second Fixed Contact 23A First Fixed Contact 23B Second Fixed Contact 24A First Movable contact 24B Second movable contact 25A First fixed contact terminal 25B Second fixed contact terminal 26 Leaf spring

Claims (2)

An armature that rotates back and forth in response to on / off of energization of the coil, an insulating card that moves back and forth following the back and forth rotation of the armature, and a movable contact and a fixed contact that connect and disconnect in conjunction with the back and forth movement of the insulating card When, the movable contacts and the fixed contacts a cooking heaters electromagnetic relay for which are formed in the insulating base and a movable contact piece and fixed contact piece mounted respectively,
The movable contact piece is formed in a horizontally long shape, and the first movable contact and the second movable contact are formed separately from each other at the left and right ends of the movable contact piece,
The first fixed contact and the second fixed contact are disposed so as to be connected to and disconnected from the first movable contact and the second movable contact, respectively, and the first fixed contact and the second fixed contact are the first fixed contact and the second fixed contact. Provided at the upper end of the contact piece,
The first movable contact and the second movable contact are respectively connected to the first fixed contact and the second fixed contact to open and close the contact circuit of the cooking heater; and the first fixed contact and the second fixed contact; In the electromagnetic relay for an IH cooking heater in which the insulation distance between the first movable contact and the second movable contact facing each other is made large ,
The movable contact piece is attached to a leaf spring portion to which a front end portion of the insulation card is connected, and the leaf spring portion is a lateral width of a plate-like contact spring whose upper end portion is fixed to a rising portion of the insulation base. The center part of the direction is formed by cutting out in an inverted square shape, and the insulation distance (L1) between the contact spring and the first fixed contact piece and the second fixed contact piece can be increased. An electromagnetic relay for an IH cooking heater. The movable contact piece is attached to the upper end of the leaf spring portion in the horizontal direction, and the insulation distance (L3) between the movable contact piece and the first fixed contact terminal and the second fixed contact terminal can be increased. The electromagnetic relay for an IH cooking heater according to claim 1, wherein the electromagnetic relay is configured as described above.

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