JP2018138836A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating cooker in which, even if a glass tube of a glass tube heater breaks, the glass tube does not come into contact with a fan.SOLUTION: A heating cooker 100 comprises a heating chamber 11 in which an object to be heated is stored, a suction port 15 and an exhaust port 16 provided on a wall of the heating chamber, and a convection unit that convects hot air through the suction port and the exhaust port to heat the object to be heated in the heating chamber. The convection unit comprises a fan 42 to be rotated by driving of a motor 47 to suck air in the heating chamber from the suction port and send it into the heating chamber from the exhaust port, a glass tube heater 44 whose both end parts are supported at a position above the fan to heat the air sucked from the suction port, and a plurality of guard members 45 provided between the fan and the glass tube heater.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cooking device having a convection oven function.

As a conventional cooking device, a fan that rotates by driving a motor on the rear side of the heating chamber, sucks air in the heating chamber from the intake port and sends it into the heating chamber from the exhaust port, and air sucked by the fan There is one provided with a convection unit having a tube-shaped heating source for heating (see, for example, Patent Document 1).
In addition, as a conventional convection unit, there is a unit provided with a glass tube heater and a line flow fan arranged below the glass tube heater (for example, see Patent Document 2).

JP 2007-327676 A JP 2003-254537 A

  By the way, it replaces with the line flow fan of the above-mentioned patent document 2, and the convection unit comprised by applying the fan of patent document 1 can be considered. In such a convection unit, the gap between the fan and the glass tube heater becomes narrow, so if the glass tube of the glass tube heater breaks for some reason and the glass tube contacts the fan, the rotating fan As a result, there is a problem that glass tube fragments are scattered.

  The present invention has been made to solve the above-described problems, and provides a cooking device in which the glass tube does not come into contact with the fan even if the glass tube of the glass tube heater is broken. With the goal.

  A heating cooker according to the present invention convects hot air through a heating chamber in which an object to be heated is stored, an intake port and an exhaust port provided on a wall of the heating chamber, and an intake port and an exhaust port, A cooking device having a convection unit for heating an object to be heated, the convection unit rotating by driving a motor, sucking air in the heating chamber from the intake port and feeding it into the heating chamber from the exhaust port And a glass tube heater that supports both ends at a position above the fan and heats the air sucked from the air inlet, and a plurality of guard members provided between the fan and the glass tube heater It is.

  According to the present invention, since a plurality of guard members are provided between the fan and the glass tube heater, even if the glass tube is broken at any part of the glass tube heater, the broken glass tube is covered with the guard member. Can be supported. Thereby, the broken glass tube does not come into contact with the fan, and the safety can be improved.

It is sectional drawing which looked at the heating cooker which concerns on embodiment of this invention from the side surface. It is a perspective view of the convection unit of the heating cooker shown in FIG. It is a front view of the convection unit which shows the example of support of a guard member when the glass tube heater of FIG. 2 is broken.

FIG. 1 is a sectional view of a cooking device according to an embodiment of the present invention as seen from the side, and FIG. 2 is a perspective view of a convection unit of the cooking device shown in FIG. In FIG. 1, hatching indicating a cross section is omitted for easy understanding of the drawing.
The cooking device 100 according to the present embodiment is, for example, a microwave oven having an oven function. The external appearance of the heating cooker 100 is formed in a rectangular parallelepiped shape by a housing 1 and a door 3 that closes an opening 2 provided on one surface of the housing 1 so as to be freely opened and closed. The casing 1 is provided with a rectangular parallelepiped heating chamber 11 having an opening having substantially the same size as the opening 2.

  The side plate 12 in the left-right direction of the heating chamber 11 is provided with a pair of support portions 13 that protrude inward from each other. The pair of support portions 13 slidably support a ceramic square plate (not shown) on which an object to be heated is placed. An intake port 15 and an exhaust port 16 each formed by a plurality of holes are provided in the back plate 14 which is a wall of the heating chamber 11. The intake port 15 is provided at a position facing a fan 42 described later. Although the exhaust port 16 is only above the intake port 15, the exhaust port 16 may be provided above and below the intake port 15, respectively.

  The bottom of the heating chamber 11 is formed of, for example, a ceramic plate 20 that transmits high frequency, and a bottom plate 19 provided on the outer peripheral portion of the ceramic plate 20. A flat heater 18 covered with a heater cover 18 a is installed on the top plate 17 of the heating chamber 11. The flat heater 18 is configured, for example, by wiring a heating wire made of nichrome over almost the entire surface of an insulating material made of mica and covering the same member thereon. The flat heater 18 generates heat when energized, and radiates and heats an object to be heated in the heating chamber 11 through the top plate 17.

  A high frequency shielding cover 31 in which an antenna 32 and a sheathed heater 33 are accommodated is attached to the lower surface of the ceramic plate 20 of the heating chamber 11. The high frequency shielding cover 31 is connected to a waveguide 35 that propagates a high frequency oscillated from a magnetron (not shown) to the antenna 32. An antenna motor 34 that rotates the antenna 32 is installed on the bottom of the housing 1 that is located below the waveguide 35. While rotating, the antenna 32 transmits the high frequency from the waveguide 35 through the ceramic plate 20 and radiates it into the heating chamber 11 to heat the object to be heated at high frequency. The sheathed heater 33 is installed around the antenna 32 and is used to radiately heat an object to be heated from below or to increase the ambient temperature in the heating chamber 11.

  A convection unit 41 is disposed between the back plate 14 of the heating chamber 11 and the back plate 4 of the housing 1. As shown in FIG. 2, the convection unit 41 has a surface facing the back plate 14 of the heating chamber 11 opened, and a screw is attached to the back plate 14 of the heating chamber 11 via a flange 41 c provided at the peripheral edge of the opening. Etc. (see FIG. 1). The convection unit 41 is covered with a unit cover 51 at the top, bottom, left and right, and the rear.

  The convection unit 41 includes a fan 42, a glass tube heater 44 provided at a position above the fan 42, and, for example, two guard members 45 provided in a gap between the tip of the fan 42 and the glass tube heater 44. It has. Although two guard members 45 are provided, three or four guard members 45 may be used. The fan 42 is attached to a rotating shaft 43 that passes through the back plate 41 a of the convection unit 41 and the back plate 51 a of the unit cover 51. The rotation shaft 43 has a pulley 46 attached to one end thereof, and is rotatably supported by bearing portions 41d and 51b provided on the back plate 41a of the convection unit 41 and the back plate 51a of the unit cover 51, respectively. Yes.

  A motor 47 that rotates the fan 42 is installed on the bottom of the housing 1 that is located below the convection unit 41. The motor 47 has a rotating shaft 48 having a pulley 49 attached to one end thereof, and a belt (not shown) hung on the pulley 49 of the rotating shaft 48 and the pulley 49 attached to the rotating shaft 43 of the fan 42. ) To transmit the rotation to the fan 42. In the present embodiment, the drive of the motor 47 is transmitted to the fan 42 via a belt, but is not limited to this. For example, a motor 47 may be installed between the back plate 51a of the unit cover 51 and the back plate 4 of the housing 1, and the fan 42 may be rotated without using a belt.

  Both ends of the glass tube heater 44 are supported through the side plate 41 b of the convection unit 41 and the side plate of the unit cover 51. In the glass tube heater 44, for example, a heating wire 44b wound in a coil shape is provided inside the glass tube, and electrodes 44a connected to the heating wire 44b are provided at both ends of the glass tube. When a current flows through the heating wire 44b by applying a voltage to the electrode 44a, far infrared rays are emitted from the glass tube, and the air sucked from the air inlet 15 by the fan 42 is heated.

  The two guard members 45 include, for example, a plate-shaped attachment portion 45a formed in a quadrilateral shape, and an arm portion 45b that extends obliquely forward from one corner on the lower side of the attachment portion 45a and protrudes horizontally. It is configured. The tip of the arm part 45b is bent upward. The two guard members 45 are arranged in the axial direction of the glass tube heater 44.

  That is, the two guard members 45 are positions inside the both ends of the fan 42 when the fan 42 is viewed from above, and the glass between the ends of the both ends of the glass tube heater 44 and the guard member 45. In the tube, when the glass tube near the guard member 45 is broken and lowered, the lowered glass tube is disposed at a position where it does not contact the tip of the fan 42. Further, the two guard members 45 have their mounting portions 45a screwed to the back plate 41a of the convection unit 41 such that the horizontal arm portions 45b are installed below the glass tube heater 44 with a gap. It is fixed with. The tips of the arm portions 45b of the two guard members 45 are in contact with the back plate 14 (corresponding to the wall described in claim 4) of the heating chamber 11, as shown in FIG.

  In the heating cooker 100 configured as described above, when the fan 42 is rotated by driving the motor 47, the air in the heating chamber 11 is sucked into the convection unit 41 through the intake port 15. The sucked air is heated by the glass tube heater 44 to become hot air, and is sent into the heating chamber 11 from the exhaust port 16. The hot air sent into the heating chamber 11 circulates within the heating chamber 11 and is sucked into the convection unit 41 through the intake port 15 while heating the object to be heated on the square plate supported by the support portion 13. As described above, the rotation of the fan 42 forms an air path that circulates in the heating chamber 11 and the convection unit 41, and heats an object to be heated installed in the heating chamber 11 by hot air convection.

Next, the support of the guard member 45 with respect to the broken glass tube heater 44 will be described with reference to FIG.
FIG. 3 is a front view of the convection unit showing an example of support of the guard member when the glass tube heater of FIG. 2 is broken.

  As shown in FIG. 3, when the convection unit 41 is viewed from the front, the glass tube near the guard member 45 located on the left side of the glass tube heater 44 is broken, and the left end of the glass tube heater 44 is used as a fulcrum. When the broken glass tube falls downward, the glass tube lowered downward does not contact the tip of the fan 42 by the guard member 45 located on the left side. On the other hand, the glass tube of the glass tube heater 44 whose right end is supported is supported by the guard member 45 located on the left side of the two guard members 45.

  When the glass tube between the two guard members 45 in the glass tube heater 44 is broken, the broken glass tubes are supported by the guard member 45, although not shown. In addition, when the glass tube at one end of the both ends of the glass tube heater 44 is cracked and cracked, the glass tube of the glass tube heater 44 supported at the other end is connected to the other end. As a fulcrum, it is supported by a guard member 45 near the broken glass tube.

  As described above, according to the present embodiment, the two guard members 45 are positions inside the both ends of the fan 42 when the fan 42 is viewed from above, and each end of the glass tube heater 44 and the guard. In the portion of the glass tube between the member 45 and the glass tube near the guard member 45, the glass tube lowered is arranged at a position where it does not come into contact with the tip of the fan 42 when it is lowered downward.

Even if the glass tube is broken at any part of the glass tube heater 44 by the two guard members 45 arranged in this way, the broken glass tube does not come into contact with the front end of the fan, which is a safety feature. Can be improved.
Further, the tips of the arm portions 45 b of the two guard members 45 are in contact with the back plate 14 of the heating chamber 11. Thereby, even when the back plate 14 of the heating chamber 11 is heated and expands, and the back plate 14 expands toward the convection unit 41 due to this expansion, the back plate 14 of the heating chamber 11 contacts the convection unit 41. Can be prevented.

  In the present embodiment, an intake port 15 and an exhaust port 16 are provided on the back plate 14 of the heating chamber 11, and a convection unit 41 is provided between the back plate 14 and the back plate 4 of the housing 1. However, it is not limited to this. For example, the intake port 15 and the exhaust port 16 may be provided on one side plate 12 that is the wall of the heating chamber 11, and the convection unit 41 may be provided between the side plate 12 and the side plate of the housing 1.

  In the present embodiment, one fan 42 is provided in the convection unit 41, but two fans 42 may be arranged in the axial direction of the glass tube heater 44. In this case, two guard members 45 are arranged for each fan 42 at the positions described above.

  DESCRIPTION OF SYMBOLS 1 Housing | casing, 2 opening part, 3 door, 4 backplate, 11 heating cabinet, 12 side plate, 13 support part, 14 backplate, 15 inlet port, 16 exhaust port, 17 top plate, 18 flat heater, 18a heater cover, 19 bottom plate, 20 ceramic plate, 31 high frequency shielding cover, 32 antenna, 33 sheathed heater, 34 antenna motor, 35 waveguide, 41 convection unit, 41a back plate, 41b side plate, 41c flange, 41d bearing, 42 fan, 43 Rotating shaft, 44 Glass tube heater, 44a Electrode, 44b Heating wire, 45 Guard member, 45a Mounting portion, 45b Arm portion, 46 Pulley, 47 Fan motor, 48 Rotating shaft, 49 Pulley, 51 Unit cover, 51a Back plate, 51b Bearing part, 100 heating cooker.

Claims (5)

A heating chamber in which the object to be heated is stored, an intake port and an exhaust port provided on the wall of the heating chamber, and hot air is convected through the intake port and the exhaust port to heat the object to be heated in the heating chamber. A cooking device having a convection unit
The convection unit is
A fan that rotates by driving a motor, sucks air in the heating chamber from the intake port, and sends the air into the heating chamber from the exhaust port;
Both ends are supported at a position above the fan, and a glass tube heater that heats the air sucked from the intake port;
A heating cooker comprising a plurality of guard members provided between the fan and the glass tube heater.   The cooking device according to claim 1, wherein the plurality of guard members are gaps between the fan and the glass tube heater, and are arranged in an axial direction of the glass tube heater.   The plurality of guard members are two, and the two guard members are positions inside the both ends of the fan when the fan is viewed from above, and each end of the glass tube heater and the guard In the glass tube in a portion between the members, when the glass tube near the guard member is broken and lowered downward, the lowered glass tube is disposed at a position where it does not contact the fan. Item 3. A cooking device according to item 1 or 2.   The cooking device according to any one of claims 1 to 3, wherein tip ends of the plurality of guard members are in contact with a wall of the heating chamber.   5. The cooking device according to claim 1, wherein two fans are arranged in an axial direction of the glass tube heater.

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