JP4909168B2 - Cooling device for electromagnetic heating cooker - Google Patents

Description

  The present invention relates to a cooling device for an electromagnetic heating cooker that performs heating by electromagnetic induction.

  FIG. 5 shows a general configuration of the electromagnetic heating cooker. In FIG. 5, 50 is an electromagnetic heating cooker. The electromagnetic heating cooker 50 includes a heating coil 51 for electromagnetic induction heating of a cooking utensil such as a pan, a power supply device 52 configured by a high-frequency inverter that supplies high-frequency power to the heating coil 51, and the power supply device 52. The controller 53 and the like for controlling the device are housed in an open main body case 59.

  In such an electromagnetic heating cooker 50, as a cooling device for cooling the self-heating of the heating coil 51, the power supply device 52, and the control device 53 during operation, an air-cooling type as shown in Patent Document 1 is generally used. A cooling device is adopted. This air-cooling type cooling device includes an electric cooling fan 55, and the fan 55 sucks outside air as cooling air into the case 59 and forces it to flow to cool the internal devices.

  In the electromagnetic heating cooker 50 equipped with such an air cooling type cooling device, a power device 52a such as a power transistor constituting an inverter of the power supply device 52 is mounted on the finned heat sink 52b and controlled on the heat sink 52b. A printed circuit board 53a constituting the device 53 is connected and arranged.

In the process in which the outside air sucked from the intake port 59a of the main body case 59 is forced to flow through the case 59 as shown by a solid line arrow and discharged from the exhaust port 59b by the cooling fan 55, the power device 52a and The heat transfer heat sink 52b and the mounted electronic circuit element 53a of the printed circuit board 53b constituting the control device 53 are cooled, and the heat generated here is carried out of the case 59. At the same time, part of the cooling air is passed through the lower surface of the heating coil 51 through the ventilation holes 54 a of the partition plate 54, thereby cooling the heating coil 51.
JP 2006-210365 A

  Such air-cooled electromagnetic heating cookers are used in kitchens or kitchens where foreign matter such as oily smoke, steam, and dust generated during cooking floats in the air, whether for home use or business use. The For this reason, since a large amount of such foreign matter is contained in the cooling air taken into the electromagnetic heating cooker for cooling, an air filter for removing foreign matter in the air is provided at the intake port of the case of the electromagnetic heating cooker. Installed. However, this filter adsorbs foreign matter and causes clogging. To maintain cooling performance, it is necessary to perform regular maintenance to eliminate clogging of the filter. Cost. In addition, particulate foreign matter such as oily smoke passes through the air filter and enters the case of the cooker, and adheres to the electronic equipment in the case. Risk of damage to internal electronics.

  In order to solve such a problem, the present invention provides a cooling device for an electromagnetic heating cooker with high environmental resistance, which requires almost no maintenance and can stably operate the electromagnetic heating cooker for a long period of time. It is an object to do.

  In order to solve the above-described problems, the present invention provides an electromagnetic heating cooker including an electromagnetic induction heating coil, a power supply device including a high-frequency inverter that supplies high-frequency power to the heating coil, and a control device that controls the power supply device. The power supply device and the control device are housed in a sealed protective case, and in this protective case, a power device that constitutes a high-frequency inverter of the power supply device is attached, and a liquid-cooled type having a cooling liquid passage inside A cooling body, an air cooler thermally coupled to the cooling body, and an air circulation fan for circulating the air in the protective case through the air cooler are provided, and the cooling liquid is externally supplied to the cooling body. And cooling the power supply device and the control device by circulating air in the protective case by the air circulation fan. It is an feature.

  In the present invention, a cooling liquid flow path is formed in the heating coil, and a part or all of the cooling liquid flowing through the liquid cooling type cooling body is allowed to flow through the cooling liquid flow path of the heating coil. By doing so, the cooling effect of the heating coil can be enhanced.

  Further, the liquid cooling type cooling body may be configured by providing protrusions partially in the internal cooling liquid flow path and applying a coating agent having functions of preventing adhesion of scale and preventing oxidation corrosion to the inner wall surface. it can.

  According to the present invention, a liquid-cooled cooling body and a thermal cooling to the cooling body are provided in a sealed protective case in which a power supply device and a control device configured by electronic devices constituting an electromagnetic heating cooker are housed. An air cooler coupled to the air cooler and an air circulation fan for circulating the air in the sealed case through the air cooler are provided, and the liquid cooling type cooling body is cooled by a coolant supplied from the outside. It is possible to cool the power device of the power supply device having a large calorific value and cool the air in the protective case via the air cooler. As a result, there is no need to introduce outside air containing foreign matter such as oily smoke, steam, and dust generated during cooking into the protective case containing the power supply device and control device configured with electronic devices. No air filter is required. For this reason, maintenance is easy, and even if it operates for a long period of time, there is no danger that an internal electronic device will be damaged, and an electromagnetic heating cooker with high environmental resistance can be provided.

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

  1 and 2 show the configuration of an embodiment of the present invention, FIG. 1 is a longitudinal sectional view thereof, and FIG. 2 is an exploded perspective view showing the electromagnetic heating cooker in FIG. 1 except for a protective case and a main body case. It is.

  1 and 2, an electromagnetic heating cooker 10 includes an electromagnetic induction heating coil 11, a power supply device 12 configured to supply high-frequency power to the heating coil 11, and a control device 13 that controls the power supply device 12. These devices are housed in a common main body case 19. A sealed protective case 18 is provided in the main body case 19 according to the present invention. The protective case 18 houses the power supply device 12 and the control device 13 that are configured by electronic devices.

  The power supply device 12 housed in the protective case 18 is provided with a liquid cooling type cooling body 12b that cools the cooling liquid by flowing through the inside thereof. On the cooling body 12b, a component of an inverter that generates a large amount of heat. Install the power device 12a. The cooling body 12b is further thermally coupled with an air cooler 16 formed by combining a plurality of radiating fins 16a in a grid pattern, and an electric air circulation fan 15 is attached to the cooler 16. Moreover, the printed circuit board 13b which comprises the control apparatus 13 is attached on the cooling body 12b in the form where the cooler 16 is pinched | interposed. And the air circulation fan 15 is attached to the air cooler 16 couple | bonded with the cooling body 12b. The air circulation fan 15 circulates the air in the sealed protective case 18 through the radiating fins 16a of the air cooler 16 in the protective case.

  Further, as shown in FIG. 2, the heating coil 11 is formed of an electric conductor having a cooling liquid passage 11a inside like a copper pipe, and the inlet 11a of the cooling liquid passage of the heating coil 11 is liquid-cooled. The cooling liquid through-flow passage outlet 12f of the shaped cooling body 12b is connected by an insulating connecting pipe 17a, and the cooling body 12b and the cooling liquid flow path of the heating coil 11 are connected in series with each other. Then, the inlet 12e of the cooling liquid passage of the cooling body 12b and the outlet 11b of the cooling through passage of the heating coil 11 are connected to a cooling liquid supply source such as water supply (not shown) via connection pipes 17b and 17c, respectively. Then, the cooling liquid is caused to flow from the supply source to the cooling body 12 b and the cooling liquid passage of the heating coil 11. The cooling liquid discharged from the outlet 11b is discharged as it is, or a liquid cooler (not shown) is provided outside the electromagnetic heating cooker 10, cooled by this liquid cooler, circulated and reused. can do.

  On the other hand, the heating coil 11 connects the connection terminals 11s and 11t to the output terminals 12s and 12t of the power supply device 12 via the connection lines 11e and 11f, respectively, and is excited by the high-frequency current supplied from the power supply device 12. Generate a magnetic field. This high frequency magnetic field heats a cooking pan or the like placed therein to perform cooking.

  When the electromagnetic heating cooker 10 configured as described above is energized and operated, the power device 12a and the heating coil 11 of the power supply device 12 through which a large amount of current flows generate a larger amount of heat. In order to cool this heat, the cooling liquid is supplied from the cooling liquid supply source to the cooling body 12b connected in series and the cooling liquid passage of the heating coil. At the same time, the air circulation fan 15 attached to the air cooler 16 is also operated.

  The heat of the power device 12a of the power supply device 12 having the largest heat generation is cooled by the cooling liquid flowing through the power device 12a through the cooling body 12b. The cooling liquid that has cooled the power device 12a and has exited from the cooling body 12b continues to flow into the cooling liquid passage of the electromagnetic heating coil 11, cools the heating coil 11, and flows out from the connection pipe 17c. Thus, since the power device 12a and the heating coil 11 having a large calorific value can be cooled well by the cooling liquid, it is possible to safely operate by preventing overheating of these devices.

  On the other hand, the air in the sealed protective case 18 in which the power supply device 12 and the control device 13 are housed by the air circulation fan 15 passes through the air cooler 16 in the protective case 18 as shown by solid line arrows in FIGS. It is circulated in. Thus, the air circulating in the protective case 18 comes into contact with the power device 12a of the power supply device 12 and the electronic circuit element 13a mounted on the printed circuit board 13b of the control device 13, and absorbs heat of these elements. And cool. When the circulating air passes through the air cooler 16, the heat absorbed by the circulating air is transmitted to the liquid cooling type cooling body 12b through the radiation fins and absorbed by the cooling liquid flowing through the cooling body 12b. And is carried out of the apparatus. For this reason, the control device 13 and the like in the protective case 18 are also cooled well.

  According to the present invention, the power supply device 12 and the heating coil 11 having a large calorific value are cooled by the cooling liquid, and the control device 13 having a small calorific value is enclosed in the protective case 18 together with the electronic equipment constituting the power supply device 13. And is cooled by the air in the protective case that is cooled by the air cooler coupled to the liquid cooling type cooling body 12b. Therefore, it is necessary to supply outside air for cooling the electromagnetic heating cooker 10. It will not be. Therefore, even if it is used in a kitchen or a kitchen where a large amount of foreign matter such as oil smoke, steam, and dust is suspended in the air, the internal electronic devices will not be contaminated by the foreign matter in the air. It can be operated stably, and since an air filter that requires regular maintenance is not necessary, maintenance work can be saved.

  One embodiment of the liquid cooling type cooling body used in the present invention is shown in FIG.

  The cooling body 12b shown in FIG. 3 is composed of a flat base 1 and a lid 2 formed of a highly heat conductive metal plate or the like. As shown in FIG. 3A, a U-shaped groove 1a serving as a flow path for the cooling liquid is formed inside the base 1. As shown in FIG. 3B, the surface of the base 1 where the groove 1a is opened is covered with a lid 2 via a packing 2a such as an O-ring, and is liquid-tightly coupled to the base 1 so that the cooling body 12b is configured. Further, by appropriately providing the protrusion 1b in the groove 1a, the contact area between the inner wall of the groove and the cooling liquid flowing through the groove can be increased, and the cooling effect of the cooling body can be enhanced. Furthermore, when an anticorrosion coating agent mixed with a release agent for preventing the adhesion of scales such as potassium and calcium or the occurrence of oxidative corrosion is applied to the inner wall surface of the groove 1a, A high cooling effect can be maintained stably over a period.

  FIG. 4 shows another embodiment of the liquid cooling type cooling body. The cooling body 12b of this embodiment includes a pipe 4 having a hollow liquid passage made of a highly corrosion-resistant metal such as stainless steel in a base 3 of a metal having a high thermal conductivity such as aluminum. It is formed by casting integrally.

  If constituted in this way, the structure of the cooling body 12a is simple and the manufacture becomes very easy. In this case, when a hairline-shaped shallow groove is formed on the outer peripheral surface of the pipe 4 forming the flow path of the cooling liquid and cast into a base portion 3 of a metal having a high thermal conductivity such as aluminum, the cooling liquid Since the surface area of the pipe forming the flow path can be increased and the tight bondability with the base body 3 can be increased, the thermal conductivity between the pipe 4 and the base body 3 is improved, and the cooling effect of the cooling body 12b is enhanced. It becomes possible.

  The liquid cooling type cooling body in the present invention is not limited to the exemplified configuration, and various types of cooling bodies can be used.

It is a longitudinal cross-sectional view which shows the structure of the Example of this invention. FIG. 2 is a perspective view showing a main body case 18 and a case 19 in the embodiment shown in FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the 1st Example of the liquid cooling type cooling body used for this invention, (a) is plane sectional drawing of the aa line of (b), (b) is (a). It is elevation sectional drawing of a bb line. It is a perspective view which shows the structure of the 2nd Example of the liquid cooling type cooling body used for this invention. It is a longitudinal cross-sectional view which shows the structure of the conventional electromagnetic heating cooker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Electromagnetic insulator cooker 11: Electromagnetic heating coil 12: Power supply device 12a: Power device 12b: Liquid cooling type cooling body 13: Control device 13a: Electronic circuit element 13b: Printed circuit board 15: Air circulation fan 16: Air cooler 18: Sealed protective case

Claims (3)

  In an electromagnetic heating cooker including an electromagnetic heating coil, a power supply device including a high-frequency inverter for supplying high-frequency power to the heating coil, and a control device for controlling the power supply device, the power supply device and the control device are hermetically sealed. In this protective case, a power-cooling type cooling body having a cooling liquid flow path installed therein and a power device that constitutes the high-frequency inverter of the power supply device, and the cooling body are thermally coupled An air cooler and an air circulation fan that circulates the air in the protective case through the air cooler are provided to supply a cooling liquid from the outside to the cooling body, and the air circulation fan supplies the cooling liquid in the protective case. A cooling device for an electromagnetic heating cooker, wherein the power supply device and the control device are cooled by circulating air.   2. The apparatus according to claim 1, wherein a cooling liquid passage is formed in the heating coil, and a part or all of the cooling liquid flowing through the liquid-cooled cooling body is passed through the cooling liquid passage of the heating coil. A cooling device for an electromagnetic heating cooker, characterized in that it is configured to allow     3. The apparatus according to claim 1 or 2, wherein the liquid cooling type cooling body is provided with a protrusion partially in an internal cooling liquid passage and having a function of preventing adhesion of scale and oxidation corrosion on an inner wall surface. A cooling device for an electromagnetic heating cooker, characterized in that an agent is applied.

Images