JP5389245B1 - Induction heating cooker - Google Patents

Abstract

An induction heating cooker capable of stably cooling an infrared sensor by suppressing displacement of the infrared sensor attached to a coil base.
A coil base 22 that holds a heating coil 21 on the upper surface side and a plurality of air outlets 31 that are provided to face the lower surface of the coil base 22 and blow cooling air toward the lower surface of the coil base 22 are provided. A cooling duct 30, a spring 25 for urging the coil base 22 from the lower side toward the top plate 2, a support shaft 26 inserted inside the spring 25 in the same direction as the urging direction of the spring 25, An infrared sensor 40 is provided on the lower surface of the coil base 22 so as to face the cooling duct 30 and detects infrared rays radiated from an object to be heated. An upper portion of the support shaft 26 is a support shaft formed on the coil base 22. The lower portion of the support shaft 26 is inserted into the insertion groove 231 and attached to the cooling duct 30.
[Selection] Figure 8

Description

  The present invention relates to an induction heating cooker that induction-heats an object to be heated placed on a top plate with a heating coil.

  In a conventional induction heating cooker, a coil base that holds a heating coil is supported from below by a spring, and the coil base is configured to be able to swing in the horizontal direction in addition to the vertical direction (for example, Patent Documents). 1).

  As another conventional technique, an induction heating cooker has been disclosed in which a coil base is supported by a support leg including a “rod-like coil support” and a “compression coil spring” (for example, see Patent Document 2).

  As another prior art, there is a technology in which the coil base is supported by a spring and an infrared sensor attached to the coil base is disposed in the air path from the cooling fan to the exhaust port to cool the infrared sensor. It has been disclosed (for example, see Patent Document 3).

JP 2007-335089 A (FIGS. 1 and 2) JP 2010-212189 A (paragraph [0015], FIG. 4) JP 2010-1114017 (FIGS. 1 and 4)

  In the induction heating cooker described in Patent Document 1, the coil base supported by the spring swings in the horizontal direction during assembly, transportation, or use. Therefore, when an infrared sensor that detects infrared rays emitted from a heated object such as a pan through a top plate and detects the temperature of the heated object based on the amount of infrared rays is attached to the coil base, it is attached to the coil base. The position of the infrared sensor is also shifted. Although it is necessary to cool an infrared sensor with cooling air etc. in order to suppress that an infrared sensor raises in temperature by the influence of the heat which generate | occur | produces from a heating coil or a to-be-heated object, an infrared sensor is horizontal like patent document 1. When the position is displaced in the direction, the manner in which the cooling air hits the infrared sensor changes, and the infrared sensor is not effectively cooled, and there is a problem that the detection accuracy of the infrared sensor is lowered.

  Further, although Patent Document 2 has a description that the coil base is supported by a support leg including a “rod-shaped coil support” and a “compression coil spring”, the “bar-shaped coil support” is heated. It was not clear whether the coil was supported. Further, Patent Document 2 does not describe the cooling of the infrared sensor and the detection accuracy of the infrared sensor as described above.

  In addition, as in the technique described in Patent Document 3, an infrared sensor attached to a coil base that is simply supported by a spring may be displaced due to the swinging of the spring. When the positional deviation of the infrared sensor occurs, the manner in which the cooling air hits the heating coil also changes, and the degree of cooling of the heating coil may vary.

  The present invention has been made against the background of the above-described problems, and provides an induction heating cooker that can stably cool the infrared sensor by suppressing the displacement of the infrared sensor attached to the coil base. To do.

An induction heating cooker according to the present invention includes a top plate on which an object to be heated is placed, a heating coil that is disposed below the top plate and induction-heats the object to be heated, and a coil that holds the heating coil on the upper surface side. A cooling duct provided with a base, a plurality of air outlets for blowing cooling air toward the lower surface of the coil base, and a coil base that is biased toward the top plate from below , A support shaft inserted in the same direction as the biasing direction of the spring inside the spring, and attached to the lower surface of the coil base so as to face the cooling duct, and detects infrared rays emitted from the heated object a infrared sensor, the upper supporting region shaft is inserted into the support shaft insertion groove formed in the coil base, the lower portion of the support shaft is intended to be attached to the cooling duct, the lower portion of the support shaft, formed in the cooling duct Support Is inserted into the insertion hole, it is intended to be fixed to the cooling duct.

  According to the present invention, while the vertical movement of the coil base is ensured by the elastic force of the spring, the horizontal movement of the coil base is limited between the support shaft insertion groove provided on the coil base and the support shaft. . For this reason, the position shift to the horizontal direction of a coil base and the infrared sensor attached to this coil base and a cooling duct is suppressed. The flow of the cooling air supplied from the cooling duct having a plurality of outlets is more complicated than that described in, for example, Patent Document 3, but because the manner in which the cooling air flowing in a complicated manner hits the infrared sensor is stable. The cooling state of the infrared sensor can be stably maintained, and the decrease in detection accuracy of the infrared sensor can be suppressed.

It is a disassembled perspective view which shows the state which removed the top plate of the induction heating cooking appliance which concerns on embodiment of this invention. It is a disassembled perspective view of the heating coil unit and cooling duct which concern on embodiment. It is a perspective view of the state where the heating coil unit concerning an embodiment was attached to a cooling duct. It is sectional drawing in the AA of FIG. It is a schematic sectional drawing of the principal part of the induction heating cooking appliance which concerns on embodiment. It is the elements on larger scale of the induction heating cooking appliance which concerns on embodiment. It is a partial exploded perspective view of the induction heating cooking appliance which concerns on embodiment. It is a schematic sectional drawing of the principal part of the induction heating cooking appliance which concerns on embodiment. It is a schematic sectional drawing of the support leg which concerns on embodiment. It is a schematic sectional drawing centering on the coil base top plate holding member and spring which concern on embodiment. It is a comparative example of FIG.

  Hereinafter, embodiments of an induction heating cooker according to the present invention will be described with reference to the drawings. In addition, this invention is not limited by the form of drawing shown below.

Embodiment.
FIG. 1 is an exploded perspective view showing a state where the top plate of the induction heating cooker according to the embodiment of the present invention is removed. In FIG. 1, an object to be heated 200 such as a pan is also illustrated.
In the induction heating cooker 100, a top plate 2 is provided on the top surface of a box-shaped housing 1 having an open top surface, and a heated object 200 such as a pan can be placed on the top plate 2. The top plate 2 is provided with a heating port 3 on which a target position for placing the article to be heated 200 is displayed by printing or the like. On the front side of the top plate 2, an operation unit 4 that receives operation inputs such as heating conditions in each of the three heating ports 3 is provided. In the present embodiment, three operation units 4 are provided corresponding to the respective heating ports 3. In addition, a display unit 5 composed of a display device such as a liquid crystal screen or a lamp is provided in the center of the front side of the top plate 2.

  Inside the housing 1 and below the top plate 2, there is a grill portion 6 having heating means such as an electric heater inside and the front surface covered with a drawer-type door, and the top of the grill portion 6. A heating coil unit 20 and a radiant heater 7 for heating an object to be heated 200 placed on the plate 2 are provided. In the present embodiment, heating coil units 20 are provided corresponding to the two left and right heating ports 3 on the front side among the three heating ports 3, and a radiant heater 7 is provided corresponding to the heating port 3 at the center rear. ing. The radiant heater 7 heats the article to be heated 200 with radiant heat when AC power of commercial frequency is supplied and the heater itself generates heat. Note that the heating coil units 20 may be provided in all the heating ports 3.

  A control device 8 is provided on the side of the grill portion 6 in the housing 1, and a cooling fan 9 is provided on the rear in the housing 1. The control device 8 is housed in a case (not shown), and an inverter circuit, various control circuits, electrical components, and the like are mounted on the substrate. Based on the operation signal output from the operation unit 4, the control device 8 performs heating control in the grill unit 6 and the heating coil unit 20 and performs operation control of the display unit 5 and the cooling fan 9.

  Behind the top plate 2, an air inlet 10 serving as an air inlet into the housing 1 and an exhaust port 11 serving as an air outlet from the housing 1 to the outside are opened. When the cooling fan 9 operates, air is sucked into the housing 1 from the air inlet 10 and sent out from the cooling fan 9. A case (not shown) that accommodates the control device 8 also serves as an air passage for cooling air, and the air sent from the cooling fan 9 flows into the case that accommodates the control device 8 to cool the control device 8. At the same time, the periphery of the heating coil unit 20 and the grill portion 6 is cooled. Thereafter, the cooling air flows out of the housing 1 from the exhaust port 11.

  The arrangement of the operation unit 4, the display unit 5, the grill unit 6, the control device 8, the cooling fan 9, the intake port 10, the exhaust port 11, and the heating coil unit 20 shown in FIG. It is not limited to. In FIG. 1, the cooling fan 9 is an axial fan, but is not limited to this.

  FIG. 2 is an exploded perspective view of the heating coil unit and the cooling duct according to the embodiment. FIG. 3 is a perspective view of the heating coil unit according to the embodiment attached to the cooling duct. 4 is a cross-sectional view taken along line AA in FIG. In addition, although the left side thing is demonstrated to the example among the heating coil units 20 provided in the induction heating cooking appliance 100 of this Embodiment here, the right side heating coil unit 20 is also the same structure.

  The heating coil unit 20 includes a heating coil 21 and a coil base 22 that houses the heating coil 21, and is mounted on a cooling duct 30 that supplies cooling air sent from the cooling fan 9 to the heating coil unit 20. In addition, an infrared sensor 40 and two contact sensors 50 are attached to the heating coil unit 20.

  The heating coil 21 generates a high-frequency magnetic field when a high-frequency current is supplied, and an eddy current is generated in the object to be heated 200 placed on the top plate 2 so that the object to be heated 200 generates heat. ing. In the present embodiment, the heating coil 21 has a triple ring structure in which three annular coils having different diameters are arranged on substantially the same plane, but the number, shape, and arrangement of the coils are not limited. Further, each of the plurality of coils may be driven independently, or the plurality of coils may be driven simultaneously.

  The coil base 22 is made of, for example, a heat-resistant synthetic resin, and has a circular shape substantially along the outer shape of the heating coil 21 in a plan view. The coil base 22 integrally holds a plurality of coils constituting the heating coil 21 on the upper surface side. Three support legs 23 projecting downward are provided on the lower surface of the coil base 22 (only one support leg 23 is shown in the drawing in FIG. 2). Three top plate holding members 24 projecting upward from the upper surface of the coil 21 are provided.

  The support leg 23 is substantially cylindrical, and is configured integrally with the coil base 22 in the present embodiment. On the outer periphery of the support leg 23, a spring 25, which is a compression coil spring that compresses and extends in the vertical direction (the axial direction of the support leg 23), is provided. A support shaft 26 extending upward from the cooling duct 30 is inserted into the spring 25. The support shaft 26 is fixed to the cooling duct 30 by a retaining member 27 (details will be described later). A spring 25 is interposed between the cooling duct 30 and the coil base 22, and the heating coil unit 20 is pushed up by the biasing force of the spring 25.

  The cooling duct 30 is disposed oppositely under the heating coil unit 20. The cooling duct 30 is connected to a case (not shown) in which the control device 8 is accommodated, and the air after being blown from the cooling fan 9 and passing through the case of the control device 8 enters the cooling duct 30. It comes to flow.

  On the upper wall surface of the cooling duct 30 (the surface facing the coil base 22), there are a plurality of outlets 31 for blowing cooling air toward members such as the infrared sensor 40 and the heating coil 21 attached to the heating coil unit 20. Is formed. The diameter and arrangement of the air outlet 31 are determined so that the heating coil 21 or the like, which is an object to be cooled, can be efficiently cooled without deviation. In the present embodiment, wind direction plates 32 are provided at some of the plurality of outlets 31. The air direction plate 32 controls the direction of the cooling air blown from the air outlet 31, covers a part of the upper portion of the air outlet 31, and blows the cooling air in a desired direction.

  The infrared sensor 40 is a non-contact type temperature sensor that detects infrared rays emitted from the object to be heated 200 via the top plate 2, converts the amount of infrared rays into temperature, and detects the temperature of the object to be heated 200. . The infrared sensor 40 is, for example, a thermopile, is accommodated in a sensor case 41 made of synthetic resin or metal, and is attached to the back surface of the coil base 22. The coil base 22 is provided with a hole at a position facing the lens of the infrared sensor 40 so that the infrared sensor 40 can receive infrared rays.

  In the present embodiment, the infrared sensor 40 is disposed so as to overlap a part of the plurality of air outlets 31 formed in the cooling duct 30 when viewed from above.

  The contact-type sensor 50 is disposed so as to be in contact with the back surface of the top plate 2, and utilizes the fact that the heat of the object 200 heated by induction heating is transferred to the top plate 2 by heat conduction. It is a temperature sensor which detects the temperature of the to-be-heated object 200 indirectly by detecting. The contact sensor 50 is, for example, a thermistor. In the present embodiment, two contact sensors 50 are arranged opposite to each other in the gap between the coils of the triple annular heating coil 21. The contact sensor 50 may be one or three or more, or the contact sensor 50 may not be provided.

FIG. 5 is a schematic cross-sectional view of the main part of the induction heating cooker according to the embodiment, showing a cross section at substantially the same position as FIG. 4. In FIG. 5, the flow of cooling air is conceptually indicated by arrows, and the position of the sensor case 41 is indicated by broken lines.
As shown in FIG. 5, a metal cooling duct support plate 12 that is disposed substantially horizontally so as to partition the space in the casing 1 up and down is provided in the casing 1. The cooling duct support plate 12 is attached by screwing or the like.

  The top plate holding member 24 is provided between the top plate 2 and the coil base 22, abuts against the back surface of the top plate 2 to support the top plate 2 from below, and between the top plate 2 and the heating coil 21. Keep the distance constant. In the present embodiment, the top plate holding member 24 is a substantially columnar member. Since the top plate holding member 24 protrudes above the upper surface of the heating coil 21, a space corresponding to the height of the top plate holding member 24 is provided between the heating coil 21 and the top plate 2. 21 is arranged substantially parallel to the top plate 2. By providing the top plate holding member 24 in this way, the distance between the object to be heated 200 and the upper surface portion of the heating coil 21 is maintained constant, and the degree of magnetic coupling between the heating coil 21 and the object to be heated 200 is maintained. As a result, the heating power can be stabilized and induction heating can be performed efficiently. Moreover, the space | interval of the upper surface of the heating coil 21 and the back surface of the top plate 2 is maintained appropriately, and the cooling air which cools the heating coil 21 can pass between these.

  The top plate holding member 24 is made of an elastic material such as rubber. By constituting the top plate holding member 24 with an elastic member having elasticity, the induction heating cooker 100 was shocked during transportation while securing a certain distance between the top plate 2 and the heating coil 21. Even if it is a case, the impact to the top plate 2 from the coil base 22 can be relieved, and the damage of the top plate 2 can be suppressed. Further, since the top plate holding member 24 is made of an elastic material, the degree of adhesion between the top plate holding member 24 and the top plate 2 is improved. Therefore, even when vibration or impact is applied, the heating coil unit 20 for the top plate 2 is applied. Can be suppressed.

  The top plate holding member 24 can also be configured as a part of the coil base 22 with the same material as the coil base 22. In this case, it is not necessary to provide the top plate holding member 24 as a separate member, so that the cost can be reduced.

  In a state where the heating coil unit 20 and the top plate 2 are attached to the housing 1, the spring 25 is compressed by the top plate 2 and the cooling duct 30, and the reaction force pushes the heating coil unit 20 against the back surface of the top plate 2. Hit. By supporting the coil base 22 with the spring 25 having elasticity, the heating coil unit 20 can be kept pressed against the top plate 2 even when the induction heating cooker 100 vibrates. The distance from the object to be heated 200 placed on the top 2 is also kept constant, and induction heating can be performed efficiently.

  The infrared sensor 40 and the sensor case 41 are attached to the lower surface of the coil base 22 through a space between the air outlet 31 of the cooling duct 30 and the cooling air blown from the air outlet 31 passes through this space. It can be done.

  The cooling air sent from the cooling fan 9 is blown out from the outlet 31 of the cooling duct 30 to cool the heating coil 21, the infrared sensor 40, the sensor case 41, and the like. The wind pressure and direction of the cooling air are adjusted by the height of the upper surface of the cooling duct 30, the hole diameters and positions of the plurality of outlets 31, and the wind direction plate 32 so that the object to be cooled can be efficiently cooled without deviation. A complex air flow is formed in the space between the cooling duct 30 and the heating coil unit 20.

  FIG. 6 is a partial enlarged view of the induction heating cooker according to the embodiment, and is a perspective view of the vicinity of the spring 25 as viewed obliquely from above. FIG. 7 is a partially exploded perspective view of the induction heating cooker according to the embodiment, and is an exploded perspective view of the support leg 23, the spring 25, the retaining member 27, and the support shaft 26 as viewed obliquely from below. In FIG. 7, the cooling duct 30 is illustrated together in a virtual manner. FIG. 8 is a schematic cross-sectional view of a main part of the induction heating cooker according to the embodiment. In FIG. 8, the flow of the cooling air is conceptually indicated by arrows. With reference to FIGS. 6-8, the structure regarding the attachment to the cooling duct 30 of the coil base 22 is demonstrated.

As shown in FIG. 7, the support leg 23 has a substantially cylindrical shape, and a support leg outer peripheral wall 28 surrounding the support leg 23 with a space is provided on the outer periphery side of the support leg 23. The support leg outer peripheral wall 28 forms a part of the coil base 22 like the support leg 23 and protrudes downward from the bottom surface of the coil base 22, but is shorter than the support leg 23. A space between the support leg 23 and the support leg outer peripheral wall 28 is referred to as a spring insertion groove 29. As shown in FIG. 8, the upper portion of the spring 25 is inserted into the spring insertion groove 29, and the upper surface of the spring 25 abuts on the upper wall 291 of the spring insertion groove 29 formed by a part of the coil base 22. . However, FIG. 6 shows a state in which the upper portion of the spring 25 is detached from the spring insertion groove 29 for the purpose of illustration. The outer diameter of the support leg 23 is substantially the same as the inner diameter of the spring 25, and the spring 25 is attached to the outer periphery of the support leg 23 so as to contact the outer periphery of the support leg 23.
Further, the lower end portion of the spring 25 is in contact with the cooling duct 30.

  A support shaft insertion groove 231 formed along the axial direction of the support leg 23 and having an open bottom surface is formed in the support leg 23. The support shaft 26 is inserted into the support shaft insertion groove 231. The inner diameter of the support shaft insertion groove 231 is substantially the same as the outer diameter of the support shaft 26 or slightly larger than the outer diameter of the support shaft 26 in order to facilitate the insertion of the support shaft 26. As shown in FIG. 8, there is a space above the upper end of the support shaft 26 in a state where the support shaft 26 is inserted into the support shaft insertion groove 231. Further, the upper surface of the support shaft insertion groove 231 does not penetrate and is closed by the ceiling wall 233. Even if the spring 25 is compressed more than usual due to vibration or the like, the upper end portion of the support shaft 26 and the ceiling wall 233 are prevented so that the upper end portion of the support shaft 26 does not contact the ceiling wall 233 of the support shaft insertion groove 231. The dimension of the space between and is set.

As described above, since the upper portion of the support shaft 26 inserted into the support shaft insertion groove 231 is blocked by the ceiling wall 233, for example, even when the induction heating cooker 100 receives an impact during transportation or the like, the support shaft It can suppress that the upper end of 26 reaches | attains the top plate 2, and damages the top plate 2 and the coating of a top plate. Therefore, the induction heating cooking appliance 100 with high reliability can be obtained.
Further, by providing a ceiling wall 233 that closes the upper side of the support shaft 26 inserted into the support shaft insertion groove 231, an area for installing the top plate holding member 24 on the ceiling wall 233, that is, on the support shaft 26 is secured. can do.

  In the assembled state, the support shaft 26 is inserted into the support shaft insertion hole 33 formed in the cooling duct 30 and passes through the cooling duct 30. An enlarged diameter portion 261 having an outer diameter larger than the diameter of the support shaft insertion hole 33 is formed at the lower end portion of the support shaft 26, and the support shaft 26 is substantially T-shaped when viewed in cross section. This enlarged diameter portion 261 functions as a first retaining portion of the support shaft 26 upward with respect to the cooling duct 30. In the present embodiment, an example is shown in which the diameter of the lower portion of the support shaft 26 is increased to configure the diameter-enlarged portion 261. However, as long as it functions as a retaining stopper for the cooling duct 30 to the upper side of the support shaft 26. In addition, a member different from the support shaft 26 may be attached to the lower portion of the support shaft 26, and the outer shape thereof is not limited to the illustrated one.

  In a state where the support shaft 26 is inserted into the support shaft insertion hole 33 of the cooling duct 30, a second retaining portion for preventing the support shaft 26 from coming down from the support shaft insertion hole 33 is provided above the cooling duct 30. A retaining member 27 is provided. In the present embodiment, the retaining member 27 is formed of a circular flat plate member having a hole 271 into which the support shaft 26 is inserted and having an outer diameter larger than that of the support shaft insertion hole 33. In a state before the support shaft 26 is inserted, the hole 271 is smaller than the outer diameter of the support shaft 26. When the support shaft 26 is press-fitted into the hole 271, the periphery of the hole 271 tightens the support shaft 26. And the retaining member 27 are fixed. Note that the specific configuration of the retaining member 27 is not limited to the present embodiment, and any member that functions as a retaining member for the support shaft 26 in the downward direction with respect to the cooling duct 30 may be used.

Here, an example of an assembly procedure of the coil base 22 and the cooling duct 30 will be described.
When assembling the coil base 22 and the cooling duct 30, for example, the cooling shaft 30 is brought into contact with the support shaft insertion hole 33 from the lower side through the support shaft 26 to the enlarged diameter portion 261 and the back surface of the cooling duct 30. A retaining member 27 is attached from above. In this way, the cooling duct 30 is vertically sandwiched between the enlarged diameter portion 261 and the retaining member 27, and the vertical positional relationship of the support shaft 26 with respect to the cooling duct 30 is fixed, so that the coil base 22 and the cooling duct 30 are fixed. Are integrated. Next, the integrated coil base 22 and cooling duct 30 are placed on the cooling duct support plate 12, and the cooling duct 30 is fixed to the cooling duct support plate 12 by screwing or the like. Since the support shaft 26 is fixed to the coil base 22, when the cooling duct 30 is attached to the cooling duct support plate 12, the support shaft 26 does not fall out of the cooling duct 30, and assembly can be easily performed. Further, the lower surface of the enlarged diameter portion 261 of the support shaft 26 abuts on the cooling duct support plate 12, and the enlarged diameter portion 261 is vertically sandwiched between the cooling duct support plate 12 and the cooling duct 30. For this reason, by fixing the cooling duct 30 to the cooling duct support plate 12, the support shaft 26 can be fixed without using another member such as a dedicated fixing screw.

  As shown in FIG. 8, in the state after assembly, the heating coil unit 20 is pushed up toward the top plate 2 by the biasing force of the spring 25, and the heating coil for buffering between the heating coil unit 20 and the top plate 2. The vertical movement of the unit 20 is ensured by the elastic force of the spring 25. Further, a support shaft 26 is inserted inside the spring 25. Since the support shaft 26 is inserted into the support leg 23 to which the spring 25 is attached, even when vibration or impact is applied, the coil base 22 swings in the horizontal direction with the support shaft insertion groove 231. It is suppressed within the range of the gap between the support shaft 26. Thus, since the horizontal displacement of the infrared sensor 40 attached to the coil base 22 is suppressed, the manner in which the cooling air supplied from the cooling duct 30 strikes the infrared sensor 40 is also stable, and the infrared sensor 40 cooling states are stably maintained. Therefore, a decrease in detection accuracy of the infrared sensor 40 can be suppressed.

  In particular, as in the present embodiment, in the configuration in which a plurality of outlets 31 are provided in the cooling duct 30 so that the heating coil 21 and the like can be efficiently cooled evenly, for example, the cooling air blown out from one outlet of the cooling duct Compared with a structure in which the air flows only in one direction, the cooling air flow in the space between the cooling duct 30 and the coil base 22 is more complicated. Therefore, if the positional relationship between the infrared sensor 40 and the cooling air changes due to the displacement of the coil base 22 in the horizontal direction, the degree of cooling of the infrared sensor 40 also changes, thereby changing the detection accuracy of the infrared sensor 40. Thus, the temperature detection accuracy of the object to be heated 200 may be lowered. However, according to the present embodiment, since the displacement of the coil base 22 and the infrared sensor 40 attached thereto in the horizontal direction can be suppressed, a decrease in detection accuracy of the infrared sensor 40 can be suppressed.

  FIG. 9 is a schematic cross-sectional view of the support leg according to the embodiment. A guide portion 232 is formed in a lower portion of the support shaft insertion groove 231 of the support leg 23, that is, an inner peripheral surface of a portion that becomes an insertion port when the support shaft 26 is inserted into the support shaft insertion hole. The guide portion 232 is a portion configured such that the inner diameter is larger on the lower side than on the upper side. The guide portion 232 may have a step shape as shown in FIG. 9A, or may have an inclined surface shape whose inner diameter changes steplessly as shown in FIG. 9B. By providing the guide portion 232 on the inlet side of the support shaft insertion groove 231 as described above, the tip of the support shaft 26 can be easily inserted into the support shaft insertion groove 231 when the coil base 22 is assembled to the cooling duct 30. Since the clearance between the support shaft 26 and the support shaft insertion groove 231 leads to the horizontal swing of the spring 25, the clearance between the support shaft 26 and the support shaft insertion groove 231 should be as small as possible. The outer diameter of the support shaft 26 and the inner diameter of the support shaft insertion groove 231 are preferably as close as possible. However, if the guide portion 232 is not provided, the support shaft 26 must be inserted into the support shaft insertion groove 231 having substantially the same diameter as that, which makes assembly work difficult and takes time. By providing the guide portion 232 at the insertion port of the support shaft insertion groove 231 as in the present embodiment, the assembly operator first inserts the tip of the support shaft 26 into the guide portion 232 having a diameter larger than that of the support shaft 26. Therefore, the assembly can be easily performed as compared with the configuration without the guide portion 232.

FIG. 10 is a schematic cross-sectional view mainly showing the coil-based top plate holding member and the spring according to the embodiment. FIG. 11 is a comparative example of FIG. A preferred arrangement of the top plate holding member 24 will be described with reference to FIGS.
FIG. 10A shows an example in which the top plate holding member 24 is arranged inside the winding diameter of the spring 25. In FIG. 10A, the top plate holding member 24 is arranged coaxially with the support shaft 26, and the spring 25 and the top plate holding member 24 wound around the support leg 23 so as to be coaxial with the support shaft 26. Are configured to be closer to the same axis. In this way, by providing the top plate holding member 24 inside the winding diameter of the spring 25, the operating point 60 (the upper wall 291 of the spring insertion groove 29) where the spring 25 abuts and applies an upward force to the coil base 22. And the weighting point from the top plate 2 to the top plate holding member 24 comes to be located nearby.

  FIG. 10B is an example in which the top plate holding member 24 is arranged so that a part of the top plate holding member 24 is located inside the winding diameter of the spring 25. In the case of FIG. 10B, a part of the top plate holding member 24 protrudes from the spring 25, but the action point 60 of the spring 25 and the weighting point of the top plate holding member 24 are arranged close to each other.

  On the other hand, FIG. 11 shows a comparative example of the present embodiment, but the top plate holding member 24 is not provided inside the winding diameter of the spring 25, and the weighting point of the top plate holding member 24 is The action point 60 of the spring 25 is separated. With such a configuration, for example, when the object to be heated 200 is placed on the top plate 2 and the top plate 2 is pushed from above, the side surfaces of the support legs 23 and the support shaft 26 are bent or bent. Is also a concern. If it does so, the coil base 22 will incline, the distance between the heating coil 21 and the to-be-heated material 200 will also change, and the efficiency of induction heating will fall. Moreover, the positional relationship between the infrared sensor 40 attached to the coil base 22 and the air outlet 31 also changes, the cooling state of the infrared sensor 40 changes, and the detection accuracy of the infrared sensor 40 decreases.

  However, by configuring as shown in FIGS. 10A and 10B, even if the coil base 22 is made of a thermoplastic resin such as PET or PBT, the action point 60 and the top plate are held. Compared with the case where the member 24 is separated, the deformation of the support leg 23 (coil base 22) accompanying the temperature rise during heating can be suppressed. Since the deformation of the support leg 23 is suppressed, the distance between the top plate 2 and the heating coil 21 is also kept constant, and efficient induction heating is maintained over a long period.

  In addition, since the deformation of the support leg 23 is suppressed, the installation position of the infrared sensor 40 attached to the coil base 22 is also stably maintained, and how the cooling air blown from the cooling duct 30 hits the infrared sensor 40. Since the infrared sensor 40 is cooled stably and the infrared sensor 40 is cooled, the detection accuracy of the infrared sensor 40 can be maintained. In particular, as in the present embodiment, in the configuration in which a plurality of outlets 31 are provided in the cooling duct 30 so that the heating coil 21 and the like can be efficiently cooled evenly, for example, the cooling air blown out from one outlet of the cooling duct Compared with a structure in which the air flows only in one direction, the cooling air flow in the space between the cooling duct 30 and the coil base 22 is more complicated. Therefore, if the positional relationship between the infrared sensor 40 and the cooling air changes due to deformation of the support leg 23 or the like, the degree of cooling of the infrared sensor 40 also changes, thereby changing the detection accuracy of the infrared sensor 40 and the object to be heated. The temperature detection accuracy of 200 can be lowered. However, according to the present embodiment, since the deformation of the support leg 23 can be suppressed, the detection accuracy of the infrared sensor 40 can be maintained.

  Further, in the present embodiment, since the ceiling wall 233 that closes the upper side of the support shaft 26 inserted into the support shaft insertion groove 231 as described above is provided, the ceiling wall 233, that is, the support shaft 26 of the support shaft 26 is provided. An area for installing the top plate holding member 24 is ensured. Therefore, the top plate holding member 24 can be installed coaxially with the support shaft 26.

The arrangement of the top plate holding member 24 and the spring 25 shown in FIGS. 10A and 10B is an example, and at least a part of the top plate holding member 24 is the point of action of the spring 25 when viewed from above. It is only necessary to overlap with 60 or to be disposed inside the action point 60.
In this embodiment, a plurality of sets (three sets) of support legs 23, a top plate holding member 24, and a spring 25 are provided for each heating coil unit 20, and all of the plurality of sets are as shown in FIG. By adopting a simple configuration, the effect of suppressing deformation of the coil base 22 is enhanced. However, for example, when the configuration shown in FIG. 10 cannot be adopted for all of the plurality of sets of support legs 23, the top plate holding member 24, and the spring 25 in relation to the arrangement of other members, only a part of FIG. The configuration may be adopted.

  DESCRIPTION OF SYMBOLS 1 Case, 2 Top plate, 3 Heating port, 4 Operation part, 5 Display part, 6 Grill part, 7 Radiant heater, 8 Control apparatus, 9 Cooling fan, 10 Air inlet, 11 Air outlet, 12 Cooling duct support plate, 20 heating coil unit, 21 heating coil, 22 coil base, 23 support leg, 24 top plate holding member, 25 spring, 26 support shaft, 27 retaining member, 28 support leg outer peripheral wall, 29 spring insertion groove, 30 cooling duct, 31 outlet, 32 wind direction plate, 33 support shaft insertion hole, 40 infrared sensor, 41 sensor case, 50 contact sensor, 60 action point, 100 induction heating cooker, 200 object to be heated, 231 support shaft insertion groove, 232 guide Part, 233 ceiling wall, 261 enlarged diameter part, 271 hole, 291 upper wall.

Claims (6)

A top plate on which the object to be heated is placed;
A heating coil that is disposed below the top plate and induction-heats the object to be heated;
A coil base for holding the heating coil on the upper surface side;
A cooling duct provided with a plurality of outlets that are provided to face the lower surface of the coil base and blow cooling air toward the lower surface of the coil base;
A spring for urging the coil base from the lower side toward the top plate;
A support shaft inserted inside the spring in the same direction as the biasing direction of the spring;
An infrared sensor that is attached to the lower surface of the coil base so as to face the cooling duct and detects infrared rays emitted from the heated object;
The upper part of the support shaft is inserted into a support shaft insertion groove formed in the coil base, and the lower part of the support shaft is attached to the cooling duct,
An induction heating cooker, wherein a lower portion of the support shaft is inserted into a support shaft insertion hole formed in the cooling duct and fixed to the cooling duct. The induction heating cooker according to claim 1, further comprising a first retaining portion that restricts the support shaft inserted into the support shaft insertion hole from slipping upward of the cooling duct. A cooling duct support plate to which the cooling duct is attached on the upper surface,
The first retaining portion is an enlarged diameter portion formed by expanding the lower end portion of the support shaft,
The upper surface of the expanded diameter portion of the support shaft is in contact with the periphery of the support shaft insertion hole on the lower surface side of the cooling duct, and the expanded diameter portion of the support shaft is formed of the cooling duct and the cooling duct support plate. The induction heating cooker according to claim 2 , wherein the induction heating cooker is sandwiched vertically. Any one of claims 1 to 3, characterized in that said support shaft said support shaft inserted into the insertion hole with a second retaining portion for restricting from escaping to the lower side of the cooling duct The induction heating cooker described in 1. The induction heating cooker according to any one of claims 1 to 4 , wherein an upper surface of the support shaft insertion groove into which the support shaft is inserted is closed by a ceiling wall. The induction heating according to any one of claims 1 to 5 , wherein a guide portion having a lower inner diameter is formed with respect to the upper portion at a lower portion of the support shaft insertion groove. Cooking device.

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