JP2007311293A - Cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide high reliability for a protective device, to improve workability in assembly, and to prevent trouble such as disconnection of a lead wire in assembly from occurring, in relation to a structure for detecting the temperature of a magnetron. <P>SOLUTION: A temperature detection element 21 is mounted to a temperature detection element mounting plate 22 excelling in thermal conductivity, and the temperature detection element mounting plate 22 is brought into contact with and mounted to an anode of a magnetron 9. Thereby, the temperature detection element 21 detects the temperature of the anode significantly generating heat within the magnetron 9. As for the mounting, the temperature detection element 21 can be mounted to the magnetron 9 in a subsequent process. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cooking device having an improved structure for detecting the temperature of a magnetron.

  Conventionally, in a heating cooker, in particular, in a heating cooker in which a microwave is supplied to a cooking chamber by a magnetron and the object to be cooked is heated by this microwave, the temperature detection element detects the temperature of the magnetron. Insufficient cooling due to a failure of the fan that cools the magnetron, or abnormal temperature rise of the magnetron due to heating without cooking objects in the cooking chamber, causing a malfunction of the magnetron, burning of surrounding parts, etc. Try to prevent.

  In this case, the temperature detecting element is generally attached to the yoke of the magnetron and detects the temperature of the yoke. However, the yoke of the magnetron is not in direct contact with the anode that generates a large amount of heat among the magnetrons, so that the temperature of the yoke is lower than the temperature of the anode and rises with a delay. For this reason, if the anode does not reach an extremely high temperature, an abnormal temperature rise cannot be determined, and there is a problem in reliability as a protective device.

On the other hand, there is a structure in which a folded portion is formed in a cooling fin attached to the anode, and a temperature detecting element is inserted and held in the folded portion (see, for example, Patent Document 1).
Japanese Patent No. 2823312 (FIG. 6)

  In the above-described cooling fin attached to the anode, a folded portion is formed, and the temperature detecting element is inserted and held in the folded portion, and the temperature detecting element comes into contact with the anode through the folded portion of the cooling fin. The temperature sensing element senses the temperature of the magnetron anode. Therefore, high reliability as a protection device can be obtained.

  However, regarding the attachment, it is difficult to insert the temperature detecting element into the folded portion after attaching the cooling fin to the anode. For this reason, the temperature detecting element is first inserted and attached to the folded portion (attached), and the cooling fin is attached to the anode. In this state, a permanent magnet is attached to the magnetron, or the yoke is attached. Assembly is carried out, such as mounting or filter box mounting.

  Accordingly, the temperature detecting element remains attached to the folded portion of the cooling fin during that time, and the lead wire connected to the temperature detecting element is mounted in a state of protruding from the cooling fin having the folded portion and the other cooling fins. Work is done. For this reason, it is difficult to work because the protruding lead wire is in the way, and in addition, the operator's hand and other mounting parts are applied to the protruding lead wire and the lead wire is disconnected from the temperature detection element. There was a bug.

  The present invention has been made in view of the above-described circumstances, and therefore, the object thereof is not only high reliability as a protective device but also improvement of workability during assembly regarding a structure for detecting the temperature of a magnetron. It is another object of the present invention to provide a cooking device that can prevent the occurrence of problems such as disconnection of lead wires during assembly.

  In order to achieve the above object, in the heating cooker according to the present invention, a cooking chamber for storing an object to be cooked, a magnetron for supplying microwaves to the cooking chamber, and a temperature detection for detecting the temperature of the anode of the magnetron. The temperature sensing element is mounted on a temperature sensing element mounting plate having good thermal conductivity, and the temperature sensing element mounting plate is mounted in contact with the anode (invention of claim 1). .

  According to the above means, the temperature detecting element detects the temperature of the anode of the magnetron through the temperature detecting element mounting plate having good thermal conductivity, and therefore, the reliability as the protective device can be obtained with high reliability. As for mounting, after mounting a cooling fin, permanent magnet, yoke, filter box, etc. to the anode of the magnetron, the temperature detecting element can be mounted via a temperature detecting element mounting plate (retrofit). Therefore, the lead wire of the temperature detection element does not interfere with the attachment of these attachment parts, and further, the operator's hand and other attachment parts are applied to the lead wire during the attachment, and the lead wire from the temperature detection element. It is possible to prevent the occurrence of problems such as disconnection.

Hereinafter, an example (one embodiment) of the present invention will be described with reference to the drawings.
First, FIG. 3 shows the cooking device as a whole, and the outer box 1 is composed of an outer box lower side body 2 and an outer box upper side body 3, and the inside of the outer box lower side body 2 among them. An inner box 4 is disposed in the inner box 4 and the inside of the inner box 4 is used as the cooking chamber 5. The cooking chamber 5 has an opening 6 on the front surface, and the opening 6 is opened and closed by a door 7, and the cooking chamber 5 is opened from the opening 6 to the object to be cooked (illustrated). Is omitted).

  A lateral space outside the inner box 4 of the outer case lower side body 2 is a machine room 8, and a magnetron 9, a magnetron power supply circuit 10, a cooling fan 11, and a duct 12 are arranged in the machine room 8. ing. Among these, the magnetron 9 generates microwaves and supplies them to the cooking chamber 5, and the magnetron power supply circuit 10 supplies the magnetron 9 with a high voltage for generating microwaves (inverter), and a cooling fan 11. Is for generating cooling air for cooling the magnetron 9 and the magnetron power supply circuit 10, and the duct 12 is for guiding the cooling air after cooling the magnetron 9 to the cooking chamber 5.

  FIG. 4 shows the magnetron 9 in detail, which has a cylindrical anode 13 at the center, and a large number of cooling fins 14 are mounted on the outer periphery of the anode 13. As shown in FIG. 5, each of the cooling fins 14 has a slanted rising portion 14a at the front and rear central portions of the left and right side portions, and has trapezoidal rising portions 14b at the front and rear side portions thereof. Other than the above, it is formed in a rectangular flat plate shape and is made of a material having good thermal conductivity such as aluminum, and a large number of cooling fins 14 are mounted in parallel vertically in contact with the outer periphery of the anode 13.

Permanent magnets 15 and 16 are mounted on the upper and lower portions of the anode 13, and rectangular yokes 17 are mounted around the upper and lower and left and right sides of the cooling fin 14 group. The yoke 17 forms a magnetic circuit that applies the magnetic force generated from the permanent magnets 15 and 16 to the electron action space in the anode 13 and is made of a magnetic material.
A microwave output antenna 18 is attached to the upper portion of the yoke 17, and a filter box 19 is attached to the lower portion of the yoke 17. The filter box 19 is provided with a connection terminal 20 for supplying power to a cathode (not shown) existing in the electron action space in the anode 13.

  FIG. 6 shows the temperature detection element 21, the temperature detection element mounting plate 22, and the screw 23. Among these, the temperature detection element 21 is, for example, a thermistor, and has a ring-shaped mounting portion 24 on one side (the front side in the figure) and a lead wire 25 connected to the other side (the front side in the figure). ing. On the other hand, the temperature detecting element mounting plate 22 is made of a nonmagnetic material such as aluminum and has a good thermal conductivity, and is basically a flat plate having a width substantially the same as the inner width of the yoke 17 of the magnetron 9. And has an arcuate portion 22a on one side (also the front side in the figure) in a direction orthogonal to the width direction. This arc-shaped portion 22a is formed to have the same radius as the outer shape of the cylindrical anode 13, and a flange 22b is formed downward from the entire periphery thereof.

  In addition, an attachment receiving hole 22c is formed at the center of the temperature detection element attachment plate 22, and attachment portions 22d are bent at both left and right ends, and attachment holes 22e are formed at the attachment portions 22d. ing. With this configuration, the mounting portion 24 of the temperature detecting element 21 is aligned with the mounting receiving hole 22c, and the screw 23 is screwed from the mounting portion 24 of the temperature detecting element 21 into the mounting receiving hole 22c. The temperature detection element 21 is attached to the temperature detection element attachment plate 22 by fastening 24 to the temperature detection element attachment plate 22. Therefore, the screw 23 is an attachment member that attaches the temperature detection element 21 to the temperature detection element attachment plate 22, and is an attachment means. The temperature detection element 21 is in surface contact with the temperature detection element mounting plate 22 while being attached to the temperature detection element mounting plate 22.

  As shown in FIGS. 1 and 2, the temperature detection element mounting plate 22 to which the temperature detection element 21 is mounted is connected to the inside of the yoke 17 from the opening 17 a on the one side (front side in the figure) of the yoke 17 of the magnetron 9. The flange 22b is in contact with the outer peripheral surface of the anode 13. In this state, the mounting portion 22d contacts the inner side surfaces of the left and right sides of the yoke 17, and the mounting holes 22e are aligned with the holes 17b formed on the left and right side portions of the yoke 17. Therefore, next, the temperature detection element attachment plate 22 is attached to the yoke 17 by screwing screws 26 into the attachment holes 22e from the holes 17b.

  At this time, the screw 26 screwed into the temperature detection element mounting plate 22 from the hole 17b of the yoke 17 intersects the direction in which the temperature detection element mounting plate 22 is separated from the anode 13 of the magnetron 9, in particular, substantially orthogonal. It is an attachment member advanced in the direction, and is an attachment means. Further, if the screw 26 is unscrewed and removed, the temperature detection element mounting plate 22 can be removed from the yoke 17. Therefore, the temperature detection element mounting plate 22 is detachably mounted on the yoke 17. Further, the temperature detection element mounting plate 22 (temperature detection element 21) is located on the leeward side of the cooling air generated by the cooling fan 11 rather than the group of cooling fins 14 so that the temperature of the anode 13 of the magnetron 9 can be detected earlier. (Downward in the figure).

FIG. 7 shows an electrical configuration for performing control based on the temperature detection result of the temperature detection element 21. As a control means for controlling the overall operation of the cooking device, for example, a control device 27 comprising a microcomputer exists. In addition, a temperature detection signal is input from the temperature detection element 21 to this.
The control device 27 gives a control signal to the magnetron power supply circuit 10 on the basis of the input and a pre-stored control program, and also displays a display 28 such as a lamp or a digital display unit as a display means, and a notification. A control signal is given to an alarm device 29 such as a buzzer.

Next, the operation of the cooking device having the above configuration will be described.
When cooking with the cooking device having the above-described configuration, an object to be cooked is accommodated in the cooking chamber 5, the door 7 is closed, and cooking is started. Then, a microwave is supplied from the magnetron 9 to the cooking chamber 5, and the cooking object is heated and cooked by the microwave. At this time, the magnetron 9 is cooled by the cooling air generated by the cooling fan 11.

  The temperature detecting element 21 mounted as described above is in contact with the anode 13 of the magnetron 9 through the temperature detecting element mounting plate 22 having good thermal conductivity, and thus the magnetron through the temperature detecting element mounting plate 22. 9 of the anode 13 is detected. The temperature detection signal is input to the control device 27, and the control device 27 controls the magnetron power supply circuit 10 based on the temperature detection signal, thereby controlling the magnetron 9.

  FIG. 8 shows the situation when cooking is normally performed, and the temperature detected by the temperature detection element 21 (the temperature of the anode 13 of the magnetron 9) rises normally with the progress of cooking, Based on this, the control device 27 performs control to keep the microwave output of the magnetron 9 normal (in this case, constant).

  On the other hand, FIG. 9 shows the situation when heating is performed in a state where the cooking object 5 is not placed in the cooking chamber 5, and the temperature detected by the temperature detecting element 21 is when cooking is normally performed. Rises faster than the temperature. When the temperature detected by the temperature detecting element 21 reaches a first predetermined value (for example, 350 [° C.]), the control device 27 performs control to reduce the microwave output of the magnetron 9. Thereby, since the heat generation of the magnetron 9 is suppressed, the temperature rise of the magnetron 9 can be suppressed and the failure of the magnetron 9 can be prevented.

  On the other hand, FIG. 10 shows a situation when heating is performed in a state where the cooling fan 11 has failed, and the temperature detected by the temperature detection element 21 is not limited to when cooking is normally performed, but also from the cooking chamber 5. It rises even faster than when it is heated with no food to be cooked. When the temperature detected by the temperature detection element 21 reaches the first predetermined value, the control device 27 performs control to reduce the microwave output of the magnetron 9 as described above, but the temperature detection is performed because the magnetron 9 is not cooled. The temperature detected by the element 21 further increases. When the temperature detected by the temperature detecting element 21 reaches a second predetermined value (for example, 400 [° C.]), the control device 27 stops the microwave output of the magnetron 9. At the same time, the display 28 displays that the magnetron 9 is in an overheated state, and the notification device 29 notifies the occurrence of an abnormality. By these, it is possible to prevent the peripheral parts of the magnetron 9 from being burned out, and the user can know that the heating cooker has an abnormality in overheating of the magnetron 9.

  Thus, in this configuration, the temperature detection element 21 detects the temperature of the anode 13 that generates a large amount of heat in the magnetron 9 via the temperature detection element mounting plate 22 having good thermal conductivity. However, as compared with the conventional device that detects the temperature of the yoke 17 whose temperature rise is slow, the reliability as a protective device that prevents the failure of the magnetron 9 and the burning of surrounding components can be obtained.

  As for attachment, after attaching the cooling fin 14, permanent magnets 15 and 16, yoke 17, filter box 19, etc. to the anode 13 of the magnetron 9, the temperature detection element 21 is attached via the temperature detection element attachment plate 22. Therefore, the lead wire 25 of the temperature detecting element 21 does not obstruct the attachment of these attachment parts. It is possible to prevent the occurrence of problems such as disconnection of the lead wire 25 from the temperature detecting element 21 due to other mounting parts.

  In addition, in the present configuration, the temperature detection element mounting plate 22 is mounted by a screw 26 (mounting means) advanced in a direction intersecting with the direction in which the temperature detection element mounting plate 22 is separated from the anode 13 of the magnetron 9. Thus, even if the screw 26 is loosened, the temperature detecting element mounting plate 22 can be kept in contact with the anode 13, and the anode by the temperature detecting element 21 through the temperature detecting element mounting plate 22. 13 temperature detection can be performed with higher accuracy.

In addition, the temperature detection element mounting plate 22 can be removed, so that the temperature detection element 21 can be easily replaced in the event of a malfunction.
Further, the temperature detection element mounting plate 22 has an arcuate portion 22a having a radius substantially the same as the outer diameter of the anode 13 of the magnetron 9, and the arcuate portion 22a has a flange 22b. Since the heat conduction from the anode 13 of the magnetron 9 to the temperature detection element mounting plate 22 is less lost and more reliable, the temperature through the temperature detection element mounting plate 22 is thereby increased. The temperature of the anode 13 can be detected by the detection element 21 with higher accuracy.

  The temperature detection element mounting plate 22 is also made of a non-magnetic material, so that it is avoided that the temperature detection element mounting plate 22 is affected by the magnetic force of the permanent magnets 15 and 16 when the temperature detection element mounting plate 22 is mounted on the magnetron 9. Can be installed easily.

It is to be noted that a magnetron is provided by providing a heat conductive medium such as applying a grease having a good heat conductivity between the temperature detection element mounting plate 22 and the anode 13 of the magnetron 9 or a tape having a good heat conductivity. Thus, heat conduction from the anode 13 to the temperature detection element mounting plate 22 can be more reliably performed, and the temperature detection of the anode 13 by the temperature detection element 21 through the temperature detection element mounting plate 22 can be performed with higher accuracy.
In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications without departing from the scope of the invention.

The perspective view of the temperature detection element attachment state of the magnetron which shows one Example of this invention Front view of magnetron after temperature sensor is installed The perspective view of the outer case decomposition state of a heating cooker Front view of magnetron alone Perspective view of magnetron anode and cooling fin part Temperature detection element mounting plate, perspective view of temperature detection element and screw to be attached to the plate Electrical configuration block diagram Action diagram 1 Action explanation diagram 2 Action diagram 3

Explanation of symbols

  In the drawings, 5 is a cooking chamber, 9 is a magnetron, 13 is an anode, 21 is a temperature detection element, 22 is a temperature detection element mounting plate, 22a is an arcuate portion, 22b is a flange, and 26 is a screw (attachment means).

Claims (6)

A cooking chamber for storing the food,
A magnetron for supplying microwaves to this cooking chamber;
With a temperature detection element that detects the temperature of the anode of this magnetron,
Attaching the temperature sensing element to a temperature sensing element mounting plate with good thermal conductivity,
A cooking device, wherein the temperature sensing element mounting plate is mounted in contact with the anode.   2. The cooking device according to claim 1, wherein the temperature detecting element mounting plate is mounted by mounting means that is advanced in a direction intersecting with a direction in which the temperature detecting element mounting plate is separated from the anode of the magnetron.   The cooking device according to claim 1, wherein the temperature detection element mounting plate is removable.   The temperature sensing element mounting plate has an arcuate portion having a radius substantially the same as the outer diameter of the magnetron anode, the arcuate portion has a flange, and the flange contacts the magnetron anode. Item 1. A cooking device according to item 1.   The cooking device according to claim 1, wherein the temperature detection element mounting plate is made of a non-magnetic material. The cooking device according to claim 1, wherein a heat conduction medium is provided between the temperature detection element mounting plate and the anode of the magnetron.

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