JP2012009365A - Induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating cooker with a plurality of induction heating coils installed having high waterproof performance, which ensures reliability of an electronic substrate and the induction heating coils by preventing damage caused by attached water drops.SOLUTION: The induction heating cooker comprises a top plate provided on the top face of the main body, an inlet 16 opening upward provided at the rear of the main body, a plurality of heating coils provided beneath the top plate, an inverter substrate for controlling to drive the plurality of heating coils, a fan unit 10 for cooling the heating coils and the substrate by using cool wind supplied from the inlet 16, a throating plate 18 provided beneath the inlet 16 and above an inlet 14 of the fan unit 10, and a gutter-shaped water reception part 19 provided on a wall at the rear of the throating plate 18 and having a shape protruding backward from a front wall of the inlet 16.

Description

  The present invention relates to an induction heating cooker.

  In recent years, the trend of so-called all-electric homes, in which all home appliances are electrified, is becoming prominent. As part of this, an electromagnetic induction heating cooker that heats the pan itself using eddy current as a cooking device has been reviewed.

  Since this induction heating cooker generates heat not only from the pan but also from the induction heating coil and the control board that controls the induction heating coil during heating, it is generally performed to cool by blowing with a cooling fan. Yes.

  Conventionally, induction heating cookers use an axial fan, a multi-blade fan, or a turbo fan as a cooling fan to cool the air sucked from the top plate intake port, a control board that controls the output of the induction heating coil, and induction heating. Ventilates the coil.

  In such an induction heating cooker, water flows into the inlet of the top plate due to spilling of the pan or falling of the pan during operation, and water droplets adhere to the control board and the induction heating coil through the cooling fan described above. As a result, there is a problem that the electronic component is damaged. For this reason, it is necessary to provide a waterproof structure in the cooling channel.

  Conventionally, regardless of the type of fan, a waterproof structure for protecting the induction heating coil and the control board has been installed in the cooling flow path. Examples of such a waterproof structure of the cooling flow path are disclosed in Patent Document 1 and Patent Document 2.

JP 2002-43046 A JP 2007-73453 A

  The induction heating cooker described in Patent Document 1 uses a vertically installed multi-blade fan as a cooling fan, and forms a waterproof structure of the cooling flow path by providing a louver at the intake port of the main body. The louver is tilted downward toward the rear of the main unit.However, since the louver is located just before the fan intake port, if water drops adhere to the louver, depending on the fan's suction force, water drops on the fan side. There is a problem that water drops are scattered on the control board. Further, when a resistor such as a louver is arranged in the fan intake passage, the flow passage area is reduced and the ventilation resistance is increased, which causes problems such as a reduction in blowing performance and an increase in noise.

  In addition, the induction heating cooker described in Patent Document 2 is a water drainer having an inclined portion on the channel wall surface on the top plate side of the fan intake channel in the intake channel of the cooling fan provided with a suction port at the rear of the main body. The part is arranged. Thus, the water droplet flowing along the side wall surface of the top plate of the intake flow channel is caused to flow down from the suction port of the cooling fan to the rear side of the main body by the draining portion, thereby forming a waterproof structure. However, when the cooling fan has a strong suction force, the water drops that flow down to the rear side of the main body due to the draining part are sucked in by the suction force of the fan, and the water drops are scattered on the control board and induction heating coil arranged on the downstream side of the cooling fan. Thus, there is a problem that causes damage to electronic components.

  An object of the present invention is to realize an induction heating cooker that hardly sucks liquid into a cooling fan.

  The above-described problems include a top plate provided on the upper surface of the main body, an intake opening provided at the rear of the main body and opened upward, a plurality of heating coils provided below the top plate, and a plurality of heating coils. An inverter board that controls driving; a fan unit that cools the heating coil and the board using cooling air supplied from the air inlet; and a lower air inlet of the fan unit that is lower than the air inlet. An induction heating comprising: a draining plate provided above and a bowl-shaped water receiving portion provided on the rear side wall surface of the draining plate and protruding rearward from the front side wall surface of the intake port Solved by cooker.

  According to the present invention, since water droplets flowing into the fan suction port can be eliminated, damage to electronic components due to water droplet adhesion to the control board and the induction heating coil can be prevented, and the reliability of the induction heating cooker can be ensured.

The external appearance perspective view of the induction heating cooking appliance of Example 1. FIG. The exploded perspective view of the induction heating cooking appliance of Example 1. FIG. FIG. 3 is a side sectional view of the induction heating cooker according to the first embodiment. 1 is an external perspective view of a draining plate 18 of Example 1. FIG. FIG. 3 is a perspective view illustrating a flow path from the intake port 16 to the fan unit 10 according to the first embodiment. The external appearance perspective view of the draining board 18 of Example 2. FIG. The front view of the draining board 18 of Example 3. FIG. Side surface sectional drawing of the induction heating cooking appliance of Example 4. FIG.

  Embodiments of the present invention will be described with reference to the drawings.

  As Example 1, an induction heating cooker that includes three induction heating units and one grill and is used by being incorporated in kitchen furniture such as a system kitchen will be described.

  First, the whole structure of the induction heating cooking appliance of Example 1 is demonstrated. FIG. 1 is an external perspective view of the induction heating cooker according to the first embodiment. The glass top plate 1 is provided on the upper surface of the main body 2 and receives a load such as a pan. An operation unit 3 is provided on the right side of the front surface of the main body 2, and a grill 4 is provided on the left side of the front surface. A liquid crystal panel 5 is arranged on the front side of the top plate 1 in front of the upper surface of the main body 2, and the output state of the induction heating unit is displayed with liquid crystal to notify the user of the strength of the heating output.

  FIG. 2 is an exploded perspective view illustrating the mounting of the inverter board and the induction heating coil by removing the top plate 1 and the like from the main body in the induction heating cooker of the present embodiment. In the lower part of the top plate 1, there are an induction heating coil 6 corresponding to the right induction heating unit, an induction heating coil 7 corresponding to the left induction heating unit, and an induction heating coil 8 corresponding to the central rear heating unit. Magnetic field lines are generated by the flow of current, and the pan that is the load is heated.

  FIG. 3 is a cross-sectional side view of the induction heating cooker according to the present embodiment, cut at substantially the center of the induction heating coil 6 on the right side. As shown here, below the right induction heating coil 6 is a board that houses an inverter board 9 that supplies and controls high-frequency power to each induction heating coil inside the main body 2 and a fan unit 10 that supplies cooling air. Case 11 is arranged. As is clear from the figure, the inverter substrate 9 corresponding to each induction heating coil is stacked and arranged on the front side inside the substrate case 11. A fan unit 10 including a turbo fan (fan 12) is provided at the back of the substrate case 11, and cooling air is blown by the fan 12 driven by a motor 13.

  The fan unit 10 that houses the fan 12 includes an intake port 14 and a discharge port 15 including a plurality of openings. In this embodiment, the discharge port 15 is described as two openings, but any number of openings may be provided in accordance with the cooling of the electronic substrate or the induction heating coil. In this embodiment, a turbo fan is used as a cooling fan. However, an axial fan or a multiblade fan may be used instead of the turbo fan.

  Next, the flow of cooling air indicated by arrows in FIG. 3 will be described. On the right side of the rear part of the main body 2, an intake port 16 that is an inlet for cooling air into the main body 2 is provided. The cooling air sucked from the intake port 16 opened upward is guided to the suction port 14 of the fan unit 10.

  The air taken in from the suction port 14 of the fan unit 10 is rotated 90 degrees in the fan 12 after the fan 12 is rotated by the drive of the fan motor 13, and then further flows 90 degrees in the fan unit 10. The air is deflected and discharged from the discharge port 15. The cooling air blown from the fan unit 10 cools the inverter board 9 and each induction heating coil. The cooling air that has cooled the inverter board 9 and each induction heating coil passes through the exhaust port 17 provided on the left side of the rear portion of the main body 2 and is discharged to the outside.

  Note that the turbo fan (fan 12) described in the present embodiment has a relationship of an outer diameter of the fan and an inner diameter of the fan of an inner diameter / outer diameter of 0.4 to 0.7. Further, the exit angle of the blades is 110 degrees or less, and the number of blades is 15 or less.

  The usage method of the induction heating cooking appliance of the present Example demonstrated above is demonstrated easily. For example, the pan is placed on the right induction heating unit, that is, on the top plate 1 above the right induction heating coil 6, the power switch of the operation unit 3 is turned on, and the output adjustment corresponding to the right induction heating unit is performed. The desired output is adjusted with the liquid crystal panel 5.

  At this time, the control unit of the inverter board 9 causes a high-frequency current to flow through the right induction heating coil 6 to generate magnetic lines of force from the induction heating coil 6 to heat the pan. At the same time, the control unit drives the fan 12. The driven fan 12 sucks outside air from the intake port 16 and blows cooling air to the inverter board 9 and each induction heating coil to cool. Thereafter, the air is exhausted from the exhaust port 17 provided at the rear portion of the main body 2 to the outside air.

  Next, the details of the waterproof structure provided in the intake passage of the fan unit 10 of this embodiment will be described. As shown in FIG. 3, in the induction heating cooker of the present embodiment, a draining plate 18 is provided below the intake port 16, that is, downstream of the cooling air flow. On the rear side wall surface of the draining plate 18, a bowl-shaped water receiving portion 19 is provided.

  The front end (rear side end) of the water receiving portion 19 of the draining plate 18 is disposed so as to protrude from the front side wall surface of the intake port 16 toward the rear side of the main body. Thereby, the liquid that flows downward along the front side wall surface of the intake port 16 can be received by the water receiving portion 19. When the opening width of the intake port 16 is L1 and the distance between the front end of the water receiving portion 19 and the rear side wall surface of the intake flow path is L2, these relationships are L2 <L1. When the interval L2 is shortened, the water receiving performance is improved. However, the ventilation resistance of the intake flow path is increased, and the air flow performance is reduced and the noise is increased. If the intake channel cross-sectional area of L2 is A2, it is desirable that 0.5 × A1 <A2.

  FIG. 4 shows a perspective view of the draining plate 18. The draining plate 18 includes a bowl-shaped water receiving portion 19 inclined toward the air inlet 16 of the main body 2 and a drainage portion 20 provided at the left and right ends of the water receiving portion 19. Moreover, the taper part 21 comprised in the lower part of the draining board 18 with the curve which goes below as it goes to an edge part from the center is provided.

  FIG. 5 is a perspective view showing a flow path from the intake port 16 to the fan unit 10. In the flow path from the intake port 16 to the suction port 14 of the fan 12, a draining plate 18 is installed on the upper flow path wall surface 22 on the top plate 1 side. Further, a drain port 23 is provided on the bottom surface of the intake passage of the fan 12 and communicates with the outside of the main body.

  Here, the flow of water entering the inside of the main body 2 will be described. When water flows to the rear side of the main body 2 due to the falling or spilling of the pan placed on the top plate 1, when water enters the intake port 16, the following two main trajectories flow: Streets are mentioned. The first is a case where water flows down along the rear side wall surface of the intake port 16 and is a trajectory in which most of the water that has passed through the intake port 16 directly reaches the bottom of the intake channel. The second is a case where water flows down along the front side wall surface of the intake port 16, and a trajectory in which water drops may drop near the suction port 14 of the fan 12 through the upper flow path wall surface 22. It is.

  The waterproof structure in the second locus will be described in detail. The water that enters from the intake port 16 and flows along the upper flow path wall surface 22 flows into the water receiving portion 19. As described with reference to FIGS. 4 and 5, since the drainage portion 20 is provided at the left and right ends of the water receiving portion 19, most of the water that has flowed into the water receiving portion 19 is below the drainage portion 20. The water falls to the bottom of the intake passage. Further, part of the water that has entered the lower side of the water receiving portion 19 flows along the tapered portion 21 and reaches the left and right end portions of the draining plate 18. The tapered portion 21 is inclined downward in the left-right direction, and the water flows along this inclination, so that the drop of water at the approximate center of the tapered portion 21, that is, in the vicinity of the inlet 14 of the fan 12 is suppressed. Then, it reaches the left and right end portions of the taper portion and reaches the bottom of the intake passage. The water that has landed on the bottom of the intake passage passes through the drain port 23 of the main body 2 and is drained outside the main body.

  Further, by making the width of the drainage portion 20 of the draining plate 18 longer than the opening of the suction port 14 of the fan 12, the draining plate 18 can be disposed on the left and right immediately above the fan 12, and falls from the drainage portion 20. It is possible to suppress the sucked water from being sucked into the fan 12.

  As described above, according to the induction heating cooker of the present embodiment, the water draining plate 18 is arranged for the water that has entered through the upper flow path wall surface 22, thereby suctioning into the suction port 14 of the fan 12. Water that can be prevented can be suppressed, and water droplets scattered to the inverter board side through the fan 12 can be prevented, so that damage to electronic components due to adhesion of water drops can be prevented, and the reliability of the electronic board and induction heating coil can be ensured.

  A second embodiment of the present invention will be described with reference to FIG. Note that a description of points in common with the first embodiment will be omitted.

  In the induction heating cooker of Example 2, the draining plate 18 shown in FIG. 6 is used instead of the draining plate 18 shown in FIG. 4, and FIG. The external appearance which installed the water guide plate 24 is shown.

  The draining plate 18 of the present embodiment has a bowl-shaped water receiving portion 19 inclined toward the air inlet 16 of the main body 2, and the left and right end portions of the water receiving portion 19 are separated from the left and right end portions of the draining plate 18. The formed drainage 20 is provided on the left and right. A water guide plate 24 extending to the bottom of the main body 2 is provided below the drainage unit 20. A tapered portion 21 that is inclined downward in the left-right direction is provided at the lower portion of the water receiving portion 19. The drain part 20, the lower part, and the end part of the taper part are configured to be connected to a water guide plate 24 extending to the bottom part of the intake passage.

  With the above configuration, a waterproof structure against water that has entered from the air inlet 16 will be described. Water that enters from the air inlet 16 and flows along the upper flow path wall surface 22 flows into the water receiving portion 19 and flows separately to the drainage portions 20 on the left and right side surfaces of the draining plate 18. The water of the drainage part 20 flows along the water guide plate 24 and is guided to the bottom part of the intake flow path, and reaches the bottom part. Further, the water that has entered the lower portion of the water receiving portion 19 flows along the tapered portion 21 below the water receiving portion 19. The taper portion 21 is inclined downward to the left and right, and reaches the left and right end portions of the taper portion 21 when water flows along the inclination, and continues to flow along the water guide plate 24 so that the bottom portion of the intake channel. Led to water at the bottom. The water that has landed at the bottom of the intake passage passes through the drain port 23 of the main body 2 and is drained outside the main body.

  Therefore, the water flowing down to the vicinity of the left and right of the suction port 14 of the fan 12 is transmitted through the water guide plate 24 and is surely landed on the bottom of the intake flow path, so that the suction force of the fan 12 during the fall of the flow path space. The water sucked in can be eliminated.

  With the above flow path structure, water sucked into the fan unit 10 can be suppressed as in the first embodiment.

  A third embodiment of the present invention will be described with reference to FIG. Note that a description of points in common with the first embodiment will be omitted.

  In the induction heating cooker of Example 3, the draining plate 18 shown in FIG. 7 is used instead of the draining plate 18 shown in FIG. 4, and FIG. Shows the appearance.

  The draining plate 18 is provided with a bowl-shaped water receiving portion 25 inclined toward the intake port 16 of the main body 2, and the water receiving portion 25 is a tapered portion inclined in the left-right direction from near the center toward the lower side. 25a is provided. The left and right end portions of the water receiving portion 25 are provided with a drainage portion 20 formed by separating the left and right end portions of the draining plate 18. A tapered portion 21 that is inclined downward in the left-right direction is provided at the lower portion of the water receiving portion 25.

  In the present embodiment, the embodiment will be described with an example in which the water guide plate 24 described in the second embodiment is excluded, but the water guide plate 24 may be disposed.

  With the above configuration, a waterproof structure against water that has entered from the air inlet 16 will be described. Water that enters from the intake port 16 and flows along the upper flow path wall surface 22 flows into the water receiving portion 25. The water clogged by the water receiving portion 25 flows to the drainage portions 20 on the left and right side surfaces of the draining plate 18 along the inclination of the taper portion 25a. The water in the drainage unit 20 falls from the draining plate 18 and reaches the bottom. Further, the water that has entered the lower portion of the water receiving portion 25 flows along the tapered portion 21 below the water receiving portion 25. The taper portion 21 is inclined downward in the left-right direction, and when water flows along the inclination, the taper portion 21 reaches the left and right end portions of the taper portion 21, falls from the draining plate 18, and reaches the bottom. The water that has landed at the bottom of the intake passage passes through the drain port 23 of the main body 2 and is drained outside the main body.

  Therefore, by providing the inclined surface of the tapered portion 25a in the water receiving portion 25 of the draining plate 18, the water quickly flows down from the water receiving portion 25 to the drainage portion, so that the drainage amount of the draining plate 28 increases.

  In the above description, the right and left water receiving portions 25 themselves are inclined, but a water receiving portion as shown in FIG. 4 is adopted, and the center of the bottom portion of the water receiving portion is high and the end portion is high. It is good also as a shape which becomes low.

  With the above flow path structure, water sucked into the fan unit 10 can be suppressed as in the first embodiment.

  A fourth embodiment of the present invention will be described with reference to FIG. Note that a description of points in common with the first embodiment will be omitted.

  In the induction heating cooker according to the fourth embodiment, in addition to the configuration shown in FIG. 3, a rib 26 connected to the front side wall surface of the air inlet 16 is provided above the water receiver 19. In this embodiment, an example in which the draining plate 18 described in the first embodiment is disposed will be described. However, the rib 26 of the present embodiment is combined with the example in which the draining plate described in the second and third embodiments is disposed. It may be used.

  In the flow path from the intake port 16 to the suction port 14 of the fan 12, a draining plate 18 is installed on the upper flow path wall surface 22 on the top plate 1 side. The upper intake channel wall surface 22 in the vicinity of the upstream side of the draining plate 22 has a structure in which a rib 26 extending downward is provided. Except for the ribs 26, the structure is the same as that shown in FIG. When the draining plate 18 is installed in the upper intake flow path 22, it is fixed by support such as screwing. In this case, a gap is formed in the contact surface between the draining plate 18 and the upper intake flow path 22, and water is supplied to the fan through the clearance. There is a possibility that water flows into the unit 10 and water enters the suction port 14 of the fan 12.

  According to the configuration of the present embodiment, the water that has entered from the intake port 16 and flows along the upper flow path wall surface 22 flows down to the water receiving portion 25 along the ribs 26. By installing the ribs 26, the contact surface between the upper intake flow path 22 and the draining plate 18 can be blocked, and water can be prevented from entering. The water that has flowed down to the water receiving portion 25 by the ribs 26 is guided to the bottom of the intake passage as described in the previous embodiment, so that the water flowing to the suction port 14 of the fan 12 can be excluded.

  With the above flow path structure, the waterproof effect of the inverter board and the induction heating coil can be obtained as in the first embodiment.

DESCRIPTION OF SYMBOLS 1 Top plate 2 Main body 6,7,8 Induction heating coil 10 Fan unit 12 Fan 16 Inlet 18 Drain plate 19 Receiving part 20 Drain part 21 Taper part 24 Water guide plate

Claims (6)

A top plate provided on the upper surface of the main body;
An intake port provided at the rear of the main body and opening upward;
A plurality of heating coils provided below the top plate;
An inverter board for controlling driving of the plurality of heating coils;
Using cooling air supplied from the air inlet, a fan unit that cools the heating coil and the substrate,
A draining plate provided below the intake port and above the intake port of the fan unit,
A bowl-shaped water receiving portion provided on the rear side wall surface of the draining plate and protruding rearward from the front side wall surface of the intake port;
An induction heating cooker comprising: The induction heating cooker according to claim 1,
A drainage part for draining water from the bowl-shaped water receiving part is provided at an end of the bowl-shaped water receiving part,
An induction heating cooker characterized in that a width of the bowl-shaped water receiving portion is longer than a suction port of the fan unit. The induction heating cooker according to claim 1,
An induction heating cooker, characterized in that a tapered portion is provided at a lower portion of the draining plate, which is configured by a curve that goes downward as it goes from the center toward the end. The induction heating cooker according to claim 3,
An induction heating cooker, wherein a flat water guide plate is provided at an end of the tapered portion. The induction heating cooker according to claim 1,
The induction heating cooker characterized in that the bowl-shaped water receiving portion has a bottom shape with a high center and a low end. The induction heating cooker according to claim 1,
An induction heating cooker characterized in that a rib extending downward and connected to the front side wall surface of the intake port is provided above the bowl-shaped water receiving portion.

Images