JP2006084116A - Gas cooker with pan bottom temperature sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas cooker with a pan bottom temperature sensor of high heat resistance and high accuracy in detection by providing the optimum heat shielding constitution of the pan bottom temperature sensor while inhibiting temperature rise of an outer peripheral face of a heat shielding cylinder protecting the pan bottom temperature sensor. <P>SOLUTION: The heat shielding cylinder 11 for protection from combustion heat of a burner 1, is mounted around the pan bottom temperature sensor 14, and is provided with multiple forcible ventilation flues 12a, 12b for turning air supplied from an air blower 10 at its upper part and guiding the same to a lower part, an air guide passage 16 is formed to branch a part of the air blown out from a lower end opening 13 and guide the same to the neighborhood of a flame hole 3 of the burner, the pan bottom temperature sensor 14 shields the combustion heat from the burner 1 by a heat shielding layer formed by the forcible ventilation flues 12a, 12b, the air blown out from the lower end opening 13 is allowed to flow along an outer peripheral face of the heat shielding cylinder 11 to cool the heat shielding cylinder 11, and the air blown out from the air guide passage 16 is supplied as secondary air for combustion. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a gas cooker including a gas burner and a pan bottom temperature sensor for measuring the pan bottom temperature by contacting the bottom surface of a cooking vessel heated by the gas burner.

Conventionally, as shown in FIG. 4, this type of gas cooker is a gas stove including a burner 1 and a pan bottom temperature sensor 14 in contact with the bottom surface of a cooking vessel 6 heated by the burner, and surrounds the pan bottom temperature sensor 14. A heat shield cylinder 11 is provided, and a supply cylinder 16 for supplying air from the blower 10 is inserted into the heat shield cylinder 11, and an upper end of the heat shield cylinder 11 is inserted into a gap between the heat shield cylinder 11 and the supply cylinder 16. In the case where air is forced to flow from the portion to the outlet 17 at the lower end of the heat shield cylinder, an air guide path 18 communicating with the outlet 17 at the lower end of the heat shield cylinder is provided, and an air outlet from the air guide path 18 is provided. It arrange | positions just under the flame outlet 3 of a burner (for example, refer patent document 1).
JP 2004-60976 A

  However, the conventional gas cooker cools the pan bottom temperature sensor 14 by directly flowing the air supplied from the blower 10 around the pan bottom temperature sensor 14, and the air flow is formed by the heat shield cylinder 11 and the supply cylinder 16. A large amount of secondary air that has been heated by blowing out to the vicinity of the flame outlet 3 of the burner 1 is supplied through the air gap 18 through the air gap, and the heat to the heat shield cylinder 11 is reduced by shortening the flame. It is intended to reduce the impact on the environment. Although the direct influence of the flame can be avoided by shortening the flame, there is a concern about the influence of the radiant heat due to the increase in the flame temperature accompanying the shortening of the flame. However, the heat resistance temperature of the enamel processing applied to the surface for corrosion prevention is exceeded, and the enamel is melted or peeled off when used for a long time, and the outer peripheral surface of the heat shield cylinder 11 is abnormal. In order to avoid this problem, the air supplied from the blower 10 is directly cooled around the pan bottom temperature sensor 14 to cool the pan bottom temperature sensor 14. However, this configuration of flowing a large amount of cooling air has a problem that the detection accuracy of the pan bottom temperature sensor 14 is lowered.

  The present invention solves the above-mentioned problems, while providing an optimum heat shielding structure for the pan bottom temperature sensor while suppressing an increase in the temperature of the outer peripheral surface of the heat shield cylinder that protects the pan bottom temperature sensor. An object of the present invention is to provide a gas cooker with a pan bottom temperature sensor that ensures an optimal combustion state by supplying it as secondary air for combustion and has excellent heat resistance and high detection accuracy.

  In order to achieve the above object, the gas cooker with a pan bottom temperature sensor according to the present invention is provided with a heat shield cylinder that protects from the combustion heat of the burner around the pan bottom temperature sensor, and the heat shield cylinder is provided with air supplied from a blower. A plurality of forced air passages that are folded upward and led downward are formed, and a part of the air blown out from the lower end opening is branched to lead to the vicinity of the burner of the burner. The heat shield layer formed by the forced ventilation passage shields the heat of combustion from the burner and cools the heat shield tube by flowing the air blown out from the lower end opening along the outer peripheral surface of the heat shield tube. In addition, the air blown out from the air guide passage is supplied as combustion secondary air.

  According to the above invention, heat is prevented from the combustion heat through the plurality of cooling layers by the multiple forced air passages formed in the heat shield cylinder, so that a reliable heat shield effect is obtained and the heat shield cylinder is obtained. By flowing cooling air along the outer peripheral surface, it is possible to suppress the rise in surface temperature, and because it can be below the heat resistant temperature of enamel processing applied to the outer peripheral surface of the heat insulating cylinder, the life of the heat insulating cylinder is extended. Therefore, a more reliable heat shielding effect can be obtained by suppressing the temperature rise on the outer peripheral surface of the heat shielding cylinder. Furthermore, a part of the cooling air is blown out as secondary air for combustion through the air guide passage, so that a stable combustion state can be ensured, and the heat to the heat shield cylinder can be reduced by shortening the flame. The impact can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, while suppressing the temperature rise of the outer peripheral surface of the heat insulation cylinder which protects a pan bottom temperature sensor, while providing the optimal heat insulation structure of a pan bottom temperature sensor, a part of cooling air is used for combustion secondary air As a gas cooker with a pan-bottom temperature sensor with an excellent heat resistance and a high detection accuracy can be provided.

  1st invention is arrange | positioned in the circumference | surroundings of the pan bottom temperature sensor which measures the pan bottom temperature provided in the approximate center part of the said burner, and has measured the pan bottom temperature of the cooking container, and the burner which has the flame outlet toward the center direction And a heat shield cylinder that shields the combustion heat from the burner and a blower that supplies air into the heat shield cylinder, and the heat shield cylinder turns the air supplied from the blower upward and guides it downward. A plurality of forced ventilation passages that blow out from the lower end opening are formed, a part of the air blown out from the lower end opening is branched to form an air guide passage that leads to the vicinity of the flame opening of the burner, and the pan bottom temperature sensor is The heat shield layer formed by the forced air passage shields the combustion heat from the burner and cools the heat shield tube by flowing the air blown out from the lower end opening along the outer peripheral surface of the heat shield tube. And the air duct It is characterized in that to supply more blown air as combustion secondary air.

  According to the present invention, the heat is prevented from the combustion heat through the plurality of cooling layers by the multiple forced air passages formed in the heat shield cylinder, so that a reliable heat shield effect is obtained and the heat shield cylinder is obtained. By flowing cooling air along the outer peripheral surface, it is possible to suppress the rise in surface temperature, and because it can be below the heat resistant temperature of enamel processing applied to the outer peripheral surface of the heat insulating cylinder, the life of the heat insulating cylinder is extended. Therefore, a more reliable heat shielding effect can be obtained by suppressing the temperature rise on the outer peripheral surface of the heat shielding cylinder. Furthermore, a part of the cooling air is blown out as secondary air for combustion through the air guide passage, so that a stable combustion state can be ensured, and the heat to the heat shield cylinder can be reduced by shortening the flame. The impact can be reduced.

  According to a second aspect of the present invention, in the first aspect of the present invention, a natural ventilation path is formed between the pan bottom temperature sensor and the heat shield cylinder to flow air by a draft action, and multiple heat shields are formed by the natural ventilation path and the forced ventilation path. A layer is formed.

  According to the present invention, the natural air passage formed between the pan bottom temperature sensor and the heat shield tube and the multiple forced air passages formed in the heat shield tube are shielded from the combustion heat through the plurality of cooling layers. As a result, a reliable heat insulation effect is obtained, and a natural ventilation path is interposed between the pot bottom temperature sensor and the forced ventilation path, so that the pot bottom temperature sensor is not overcooled by a large amount of air from the blower. The detection accuracy of the pan bottom temperature sensor can be further increased.

  According to a third aspect of the present invention, in the second aspect of the present invention, an opening communicating with the natural ventilation path is provided in a part of the forced ventilation path, and a part of the air supplied from the blower is caused to flow around the pan bottom temperature sensor. The pan bottom temperature sensor is cooled.

  According to the present invention, a part of the cooling air from the blower that flows through the forced ventilation passage is caused to flow through the natural ventilation passage formed between the pan bottom temperature sensor and the heat insulation cylinder, thereby ensuring a more reliable heat insulation configuration. The detection accuracy can be improved by increasing the amount of air flowing around the pan bottom temperature sensor and ensuring the cooling effect of the pan bottom temperature sensor more optimally.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the outlet provided at the lower end of the heat shield cylinder is located below the flame outlet of the burner.

  According to the present invention, the cooling air flowing through the forced ventilation path is blown out from the lower end of the heat shield cylinder below the flame opening, and then flows upward along the outer peripheral surface of the heat shield cylinder, so that the heat shield is affected by the radiant heat of the flame. The entire outer peripheral surface of the cylinder is covered with an air curtain, and a temperature rise due to radiant heat can be suppressed, and the life of the heat shield cylinder can be extended and a more reliable heat shield effect can be obtained.

  A fifth invention is characterized in that, in any one of the first to fourth inventions, the amount of air supplied from the blower is changed according to the thermal power.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to supply optimal air quantity according to the thermal power of a burner, and can provide the thermal-insulation structure with the balance of the cooling effect and detection accuracy.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiment.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a gas cooker according to the first embodiment of the present invention.

  In the figure, the burner 1 is placed on a mounting plate 2, and a large number of slit-shaped flame ports 3 are arranged inside the substantially donut-shaped burner 1. On the other hand, a flame 4 is formed on the flame outlet 3. A spilled cover 5 is installed at the upper part of the burner 1, and a gotok 7 for placing the cooking container 6 is arranged at the upper part thereof. The gotok 7 is disposed in the approximate center of the opening provided in the top plate 8.

  A juice tray 9 for receiving the spilled liquid from the pan is placed in the lower central portion of the burner 1, and the air supplied from the blower 10 is placed in the heat shield cylinder 11 at the approximate center of the juice tray 9. Forcibly ventilated passages 12a and 12b are provided. The air sent from the blower 10 passes through the forced ventilation path 12 a formed in the heat shield cylinder 11, is folded upward, passes through the forced ventilation path 12 b formed downward, and is formed at the lower end portion of the heat shield cylinder 11. The air is blown out from the air outlet 13 which is the opened opening.

  Further, the air outlet 13 is provided with an air guide passage 16 for branching a part of the air to be blown out and led to the vicinity of the flame port 3 formed in the burner 1. The air blown out from the outlet acts as secondary air for combustion with respect to the flame 4 formed on the flame port 3 and contributes to improvement in combustion performance and flame shortening. Here, the air guide passage 16 can also be configured to serve as a juice tray 9 that receives the spilled liquid from the pan placed in the lower central portion of the burner 1.

  Further, a pan bottom temperature sensor 14 for measuring the pan bottom temperature of the cooking container 6 placed on the gotok 7 is installed at a substantially central portion surrounded by the heat shield cylinder 11. A natural ventilation path 12c in which an air flow is formed by a natural draft is provided between the pan bottom temperature sensor 14 and the heat shield cylinder 11, and a predetermined air layer is formed to further enhance the heat shield effect. It is.

  As described above, the forced air passages 12a and 12b formed in the heat shield cylinder 11 are folded upward to form a plurality of air passages, and by supplying cooling air supplied from the blower 10, A plurality of cooling layers combined with the forced ventilation paths 12a and 12b are formed by forming a cooling layer and providing a natural ventilation path 12c between the pan bottom temperature sensor 14 and the heat shield cylinder 11 and interposing a predetermined air layer. Thus, the thermal influence on the bottom temperature sensor 14 due to the combustion heat from the burner 1 is reduced.

  Next, the operation and effect of the gas cooker configured as described above will be described.

  When combustion is started in the burner 1, the blower 10 is activated, and the air sent from the blower 10 passes through the forced ventilation paths 12 a and 12 b formed in the heat shield cylinder 11, and is formed in the lower part of the heat shield cylinder 11. It blows out from the outlet 13. The blown air is influenced by the inward flame 4 formed in the flame port 3 and flows upward along the outer peripheral surface of the heat shield cylinder 11, and an air curtain is interposed between the heat shield cylinder 11 and the flame 4. Form. This air curtain can reduce the influence of the radiant heat from the flame 4, suppress the temperature rise of the heat shield cylinder 11, and perform enamel processing on the surface of the heat shield cylinder 11 with the temperature of the outer peripheral surface of the heat shield cylinder 11. The temperature can be kept below the heat-resistant temperature, and it will not corrode even if it is used for a long time.

  Further, a part of the air flowing through the lower end opening is supplied to the flame 4 formed on the flame outlet 3 by the air guide passage 16 provided in the blowout port 13 at the lower end opening of the heat shield cylinder 11, for combustion. It can also be used as secondary air, creating a better combustion state and realizing high-load combustion that shortens the flame.

  Moreover, by suppressing the temperature rise of the heat shield cylinder 11, the thermal influence on the pan bottom temperature sensor 14 is reduced. In addition, the multiple forced air passages 12a and 12b formed in the heat shield cylinder 11 and the pot bottom The natural ventilation path 12c formed between the temperature sensor 14 and the heat shield cylinder 11 enables highly accurate pot bottom temperature detection that is not affected by combustion heat.

(Embodiment 2)
FIG. 2 is a cross-sectional view of a gas cooker according to the second embodiment of the present invention. The same parts as those in FIG.

  In the second embodiment, in addition to the first embodiment, an opening 15 communicating with the natural ventilation path 12c is provided in a part of the forced ventilation path 12a, and a part of the air supplied from the blower 10 is placed at the bottom of the pan. The pan bottom temperature sensor 14 is cooled by flowing around the temperature sensor 14.

  That is, the air from the blower 10 is blown from the air outlet 13 at the lower part of the heat shield cylinder 11 via the forced air passages 12 a and 12 b, and is branched from the air outlet 13 to the vicinity of the flame outlet 3 of the burner 1. An air guide passage 16 that blows out to the flame 4 as secondary air for combustion, and an opening (sensor) that communicates with a natural air passage 12c formed between the pan bottom temperature sensor 14 and the heat shield cylinder 11 in the middle of the forced air passage 12a. A part of the cooling air supplied from the blower 10 is branched to flow around the pan bottom temperature sensor 14 and mixed with the air flowing through the natural ventilation path 12 c to cool the pan bottom temperature sensor 14. At the same time, by blowing out from the blowout port 13 at the lower end opening of the heat shield tube 11, an upward air curtain is formed on the outer peripheral surface of the heat shield tube 11 to suppress an increase in surface temperature, and the air guide passage It has a configuration to achieve the short flames of the flame by blowing than 6.

  Thereby, the temperature rise of the pan bottom temperature sensor due to the radiant heat of the flame can be prevented, and the degree of cooling of the pan bottom temperature sensor 14 is adjusted by adjusting the opening area of the sensor outlet 15 so that the detection accuracy is not affected. A cooling effect can be secured.

  The operation and effect of the above configuration will be described.

  In FIG. 3, when there is no air to blow out by closing the gap (natural ventilation path) 12 c between the pan bottom temperature sensor 14 and the heat shield cylinder 11, and when a part of the air supplied from the blower 10 is flowed as in this embodiment The temperature in the vicinity of the pan bottom temperature sensor 14 is shown.

  As can be seen from FIG. 3, when the gap (natural ventilation path) 12c between the pan bottom temperature sensor 14 and the heat shield cylinder 11 is closed and there is no air to be blown out, the temperature in the vicinity of the pan bottom temperature sensor 14 rises to nearly 500 ° C. When performing automatic cooking of tempura, the control temperature of the pan bottom temperature sensor 14 is around 160 to 200 ° C. When the temperature near the pan bottom temperature sensor 14 rises to near 500 ° C., the control temperature becomes high due to the radiant heat, and the cooking container 6 has a very large variation in oil temperature control (160 to 180 ° C.). However, when there is air that blows out from the gap (natural air passage) between the pan bottom temperature sensor 14 and the heat shield cylinder 11 as in the present embodiment, the temperature near the pan bottom temperature sensor 14 is 250 ° C. as can be seen from FIG. As a result, the influence of radiant heat is reduced and good oil temperature control becomes possible.

  Further, as shown in the figure, an air curtain is formed between the outer peripheral surface of the heat shield tube 11 and the flame 4 by installing the blowout port 13 at the lower end of the heat shield tube 11 below the flame port 3 of the burner 1. The temperature rise of the heat shield cylinder 11 can be prevented.

  If the blowout port 13 at the lower end of the heat shield tube 11 is installed above the flame port 3 of the burner 1, an air curtain cannot be formed between the heat shield tube 11 and the flame 4. The outer peripheral surface directly receives the radiant heat of the flame 4, and the temperature rise of the heat shield cylinder 11 cannot be prevented.

(Embodiment 3)
In the third embodiment, the amount of air supplied from the blower 10 is changed according to the heating power of the burner 1.

  Table 1 shows the relationship between the amount of combustion of the burner 1 and the amount of air supplied from the blower 10. As can be seen from Table 1, the amount of air supplied from the blower 10 is increased when the combustion amount is large, and the amount of air supplied from the blower 10 is decreased when the combustion amount is low.

  When the amount of combustion is large, the flame 4 formed in the flame outlet 3 of the burner 1 becomes longer, gets closer to the heat shield cylinder 11, and the surface temperature of the heat shield cylinder 11 rises. Moreover, the radiant heat to the pot bottom temperature sensor 14 increases, the temperature in the vicinity of the pot bottom temperature sensor 14 increases, and the control of the pot bottom temperature sensor 14 is affected. Accordingly, when the combustion amount is large, more cooling air of the pan bottom temperature sensor 14 is required. In addition, when the amount of combustion is large, a large amount of secondary air for combustion is required.

  On the other hand, when the amount of combustion is small, if the same amount of cooling air is sent as when the amount of combustion is large, the temperature in the vicinity of the pan bottom temperature sensor 14 is excessively cooled, which adversely affects the temperature control of the pan bottom temperature sensor 14. Moreover, the pan bottom of the cooking container 6 will be cooled excessively, and thermal efficiency will also fall. Further, when the amount of combustion is small, the flame length is short, and if an excessive amount of secondary air for combustion is sent, the flame blows off, and no flame is formed on the flame outlet 3 of the burner 1 and the fire is extinguished. .

  Therefore, when the amount of combustion is large, the amount of air supplied from the blower 10 is increased, and when the amount of combustion is small, the amount of air supplied from the blower 10 is decreased to keep the temperature near the pan bottom temperature sensor 14 constant. And good temperature control is possible. Further, it is possible to prevent a decrease in thermal efficiency when the amount of combustion is small, and it is possible to prevent the flame from blowing off.

Sectional drawing of the gas cooker in Embodiment 1 of this invention Sectional drawing of the gas cooker in Embodiment 2 of this invention The figure which shows the temperature rise of the pan bottom temperature sensor vicinity in the gas cooker Cross section of conventional gas cooker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Burner 3 Flame outlet 4 Flame 6 Cooking container 10 Blower 11 Heat shield cylinder 12a, 12b Forced ventilation path 14 Pan bottom temperature sensor 16 Breathing ventilation path

Claims (5)

A burner having a flame outlet directed in the center direction; a pan bottom temperature sensor for measuring the pan bottom temperature of a cooking vessel provided at a substantially central portion of the burner; and a combustion from the burner disposed around the pan bottom temperature sensor A heat shield cylinder for insulating heat, and a blower for supplying air into the heat shield cylinder,
The heat shield tube folds the air supplied from the blower upward and guides it downward to form a multiple forced air passage that blows out from the lower end opening, and also branches a part of the air blown out from the lower end opening. Forming an air guide passage leading to the vicinity of the flame outlet,
The pan bottom temperature sensor shields the combustion heat from the burner with a heat shield layer formed by the forced ventilation passage, and allows the air blown out from the lower end opening to flow along the outer peripheral surface of the heat shield cylinder. It is configured to cool the heat shield cylinder,
And the gas cooker with a pan bottom temperature sensor characterized by supplying the air which blows off from the said baffle passage as secondary air for combustion. 2. A natural ventilation path for flowing air by a draft action is formed between the pan bottom temperature sensor and the heat insulation cylinder, and a plurality of heat insulation layers are formed by the natural ventilation path and the forced ventilation path. Gas cooker with pan bottom temperature sensor. The opening which connects with a natural ventilation path is provided in a part of forced ventilation path, and it is set as the structure which cools the said pot bottom temperature sensor by flowing a part of air supplied from an air blower around a pot bottom temperature sensor. Gas cooker with pan bottom temperature sensor. The gas cooker with a pan bottom temperature sensor according to any one of claims 1 to 3, wherein the lower end opening of the heat shield cylinder is positioned below the flame outlet of the burner. The gas cooker with a pan bottom temperature sensor according to any one of claims 1 to 3, wherein the amount of air supplied from the blower is changed according to the thermal power.

Images