Gas burner and gas burner–equipped cooking apparatus

Abstract

According to the present invention, an annular burner head is installed on an annular burner body to which a mixed gas of a fuel gas and air is supplied such that the center axes of the burner head and the burner body are aligned, and the mixed gas as ejected from a plurality of burner ports that open at the circumference of the burner head is combusted. A temperature sensor is inserted into a central passage that passes vertically through the centers of the burner body and the burner head, and an upper end of the temperature sensor contacts a bottom surface of a cooking container that is placed above the burner head to detect the temperature of the cooking container. The temperature sensor is positioned in the central passage and fixed to the burner body by a fixing part that is provided to the burner body. The present invention thereby provides a gas burner that can suppress variation in the temperature detected by a temperature sensor that is inserted into a central passage.

Description

Gas burner and heating cooker equipped with the gas burner

[0001] The present invention relates to a gas burner that combusts a mixed gas of fuel gas and air and includes a temperature sensor capable of detecting the temperature of an upper cooking container, and to a heating cooker equipped with the gas burner.

[0002] Gas burners installed in heating cookers such as gas stoves, which comprise an annular burner body to which a mixed gas of fuel gas and air is supplied, and an annular burner head placed on the burner body with their central axes aligned, are widely used. Such gas burners combust the mixed gas ejected from a plurality of flame ports opened on the outer periphery of the burner head, thereby heating a cooking container such as a pot placed above the gas burner.

[0003] Such a gas burner provided with a temperature sensor capable of detecting the temperature of a cooking container is known (for example, Patent Document 1). The temperature sensor is inserted into a central passage vertically penetrating the center of the burner body and the burner head, and can detect temperature when the upper end of the sensor abuts against the bottom surface of the cooking container. In addition, such a temperature sensor is generally installed on a pedestal in the heating cooker where the burner body is installed.

[0004] Japanese Unexamined Patent Application Publication No. 2024-102767

[0005] However, when the burner body and the temperature sensor are each attached to the pedestal as described above, it is difficult to stabilize the positional relationship between the burner body and the burner head and the temperature sensor (to align the central axes of the burner head and the temperature sensor) due to variations in manufacturing dimensions of components such as the burner body and the temperature sensor, as well as variations in assembly position relative to the pedestal. This causes a problem in that the radiant heat transferred from the flame formed on the outer periphery of the burner head to the temperature sensor varies, leading to variations in the temperature detected by the temperature sensor.

[0006] This invention addresses the aforementioned problems in the prior art and aims to provide a technology that can suppress variations in temperature detected by a temperature sensor inserted through the central passage of a gas burner in which an annular burner head is placed on an annular burner body.

[0007] To solve the above-mentioned problems, the gas burner of the present invention employs the following configuration. That is, <First aspect> A gas burner comprising an annular burner body to which a mixed gas of fuel gas and air is supplied, and an annular burner head placed on the burner body with its central axis aligned, wherein the mixed gas is burned by being ejected from a plurality of flame holes opened on the outer circumference of the burner head, characterized in that it comprises a temperature sensor inserted through a central passage that penetrates vertically through the center of the burner body and the burner head, and the upper end of the temperature sensor abuts against the bottom surface of a cooking container placed above the burner head, thereby enabling detection of the temperature of the cooking container, and a fixing part provided on the burner body that fixes the temperature sensor to the burner body, along with positioning it in the central passage.

[0008] In this first embodiment of the gas burner, the temperature sensor is fixed to the burner body by a fixing part directly provided on the burner body, along with its position in the central passage. This allows for more stable correlation between the burner body, burner head, and temperature sensor compared to the case where the fixing part of the temperature sensor is installed on a base on which the burner body is mounted (a base is interposed between the burner body and the fixing part). As a result, differences in radiant heat transmitted from the flame formed on the outer circumference of the burner head to the temperature sensor are less likely to occur, and variations in the temperature detected by the temperature sensor can be suppressed.

[0009] <Second Embodiment> In the gas burner of the first embodiment, the burner body has a heat dissipation portion on its lower surface to promote heat dissipation, and the fixing portion is provided on the heat dissipation portion.

[0010] In this second embodiment of the gas burner, although the temperature sensor is connected to the burner body via a fixed part, the heat from the burner body is dissipated by the heat dissipation part, thereby reducing heat conduction from the burner body to the temperature sensor. As a result, it is possible to suppress the influence of the temperature rise of the temperature sensor itself on the detected temperature and the deterioration of the temperature sensor due to high temperatures.

[0011] <Third Embodiment> In the gas burner of the second embodiment, a plurality of plate-shaped fins are suspended from the lower surface of the burner body as the heat dissipation section.

[0012] In this third embodiment of the gas burner, the surface area of ​​the heat dissipation section can be increased by the multiple fins, thereby promoting heat dissipation from the burner body through thermal radiation.

[0013] <Fourth Embodiment> In the gas burner of the third embodiment, the plurality of fins are arranged radially around the central passage of the burner body.

[0014] In this fourth embodiment of the gas burner, the combustion of the gas mixture generates an upward airflow in the central passage, which easily creates an airflow from the radial outside of the burner body through the spaces between the fins towards the central passage. This promotes heat dissipation from the fins through thermal convection, thereby further reducing heat conduction to the temperature sensor.

[0015] <Fifth Embodiment> In any one of the first to fourth embodiments, the gas burner comprises, as the burner body, an annular first burner body through which the central passage through which the temperature sensor is inserted passes, and a second burner body which is annular in diameter larger than the first burner body and is arranged surrounding the outside of the first burner body; and as the burner head, an annular first burner head which is placed on the first burner body and through which the central passage through which the temperature sensor is inserted passes, and a second burner head which is annular in diameter larger than the first burner head and is placed on the second burner body; and the fixing part is provided on the first burner body.

[0016] In this fifth embodiment of the gas burner, since it has a double-ring structure (a so-called parent-child burner) having an inner first burner section on which a first burner head is placed on a first burner body, and an outer second burner section on which a second burner head is placed on a second burner body, the outer diameter of the inner first burner section tends to be small and limited, and because the distance between the flame formed on the outer circumference of the first burner head and the temperature sensor inserted through the central passage is short, the temperature detected by the temperature sensor is easily affected by the radiant heat of the flame. Therefore, by applying the present invention as described above and stabilizing the correlation between the first burner body and the first burner head and the temperature sensor, it is possible to suppress variations in the temperature detected by the temperature sensor.

[0017] <Sixth Embodiment> A gas burner according to any one of the first to fifth embodiments is mounted on the cooking appliance, and the cooking appliance above is heated by combustion from the gas burner.

[0018] In such cooking appliances, stabilizing the correlation between the burner body and burner head of the installed gas burner and the temperature sensor suppresses variations in the temperature detected by the temperature sensor, thereby improving the accuracy of controlling the heating of the cooking container based on the detected temperature.

[0019] This is a perspective view showing the external appearance of a gas stove 1 as an example of a cooking appliance equipped with the gas burner 10 of this embodiment. This is a perspective view showing the upper part of the gas burner 10 of this embodiment disassembled. This is a longitudinal cross-sectional view showing the internal structure of the gas burner 10 of this embodiment. This is a perspective view showing the configuration for fixing the support pipe 40b of the temperature sensor 40 of this embodiment. This is a perspective view showing the state in which the support pipe 40b of the temperature sensor 40 of this embodiment is fixed.

[0020] Figure 1 is a perspective view showing the external appearance of a gas stove 1 as an example of a cooking appliance equipped with the gas burner 10 of this embodiment. The illustrated gas stove 1 comprises a shallow, box-shaped stove body 2 with an open top, and a top plate 3 that rests on the stove body 2 and covers the top surface of the stove body 2. Two gas burners 10 are installed on the left and right sides of the stove body 2, and the upper parts of the gas burners 10 are exposed on the top plate 3 by being inserted through holes formed in the top plate 3. As will be described in detail later, the gas burner 10 of this embodiment is a so-called parent-child burner with a double-ring structure in which a large-diameter annular parent burner part 12 is arranged to surround the outside of a small-diameter annular child burner part 11.

[0021] On the top plate 3, a trivet 4 is installed for each gas burner 10, above which a cooking container such as a pot is placed. As shown in the figure, the trivet 4 has multiple (five in this embodiment) claws 4b radially supported by an annular frame 4a that surrounds the gas burner 10 and is mounted on the top plate 3. A cooking container is placed on the upper surface of these claws 4b, and the cooking container above is heated by burning a mixture of fuel gas and air in the gas burner 10.

[0022] Furthermore, on the front side of the top plate 3, there are operating knobs 5 corresponding to each of the two gas burners 10, which the user operates when igniting, extinguishing, or adjusting the flame intensity. When the operating knob 5 is pressed down and rotated in a predetermined direction (counterclockwise in this embodiment) from its initial position, fuel gas is supplied to the gas burner 10 and ignited by the spark plug, which will be described later. After that, by changing the rotation angle of the operating knob 5, the amount of fuel gas supplied is changed, and the flame intensity of the gas burner 10 can be adjusted. Then, by returning the operating knob 5 to its initial position, the supply of fuel gas to the gas burner 10 is stopped, and the flame is extinguished.

[0023] Figure 2 is a perspective view showing the upper part of the gas burner 10 of this embodiment in a disassembled state. As described above, the gas burner 10 of this embodiment is a double-ring structure parent-child burner in which the parent burner part 12 is arranged outside the child burner part 11. As shown in the figure, the child burner part 11 is constructed by placing an annular child burner head 14 on top of an annular child burner body 13, and the child burner body 13 and child burner head 14 of this embodiment are formed by die casting using zinc, aluminum alloy, brass, etc. The child burner body 13 of this embodiment corresponds to the "burner body" and "first burner body" of the present invention, and the child burner head 14 of this embodiment corresponds to the "burner head" and "first burner head" of the present invention. The child burner body 13 and child burner head 14 may also be formed by casting.

[0024] The annular child burner body 13 has an annular child burner mixing chamber 13c with an open top, formed between the outer peripheral wall 13a that forms the outer circumference and the inner peripheral wall 13b that forms the inner circumference. The gas piping 20 that supplies fuel gas to the gas burner 10 branches into a child branch piping 20a for the child burner section 11 and a child branch piping 20b for the child burner section 12. The fuel gas supplied by the child branch piping 20a is mixed with air as described later, and the mixed gas is supplied to the child burner mixing chamber 13c. This child burner body 13 is placed on a base 7 provided inside the stove body 2 and fixed with screws or the like.

[0025] The annular sub-burner head 14 has a cylindrical wall 14a that extends downward from its outer edge in a short cylindrical shape and forms its outer circumference, with multiple sub-burner flame holes 14h opening in this cylindrical wall 14a. In the illustrated example, the sub-burner flame holes 14h are divided into upper and lower sections, with the upper and lower sections of sub-burner flame holes 14h alternating in the circumferential direction of the cylindrical wall 14a.

[0026] On the other hand, the main burner section 12 is constructed by placing an annular main burner head 16 on top of an annular main burner body 15. In this embodiment, the main burner body 15 and the main burner head 16 are formed from die-cast parts made of zinc or aluminum alloy. The main burner body 15 has a larger diameter than the sub-burner body 13, is positioned to surround the outside of the sub-burner body 13, and is detachably attached to the sub-burner body 13. In this embodiment, the main burner body 15 corresponds to the "second burner body" of the present invention, and the main burner head 16 corresponds to the "second burner head" of the present invention.

[0027] The annular main burner body 15 has an annular main burner mixing chamber 15c with an open top, formed between an outer peripheral wall 15a that rises upward from the outer edge and an inner peripheral wall 15b that rises upward from the inner edge. The main burner mixing chamber 15c also has an inlet 15d for the inflow of the mixed gas that opens at the bottom, and as will be described later, the inlet 15d is in communication with the mixing pipe 22.

[0028] In this embodiment, the mixing pipe 22 is formed by sheet metal processing using a thin sheet of stainless steel or the like, with one end communicating with the inlet 15d of the main burner mixing chamber 15c and the other end being open. When fuel gas is injected from the nozzle 21 provided at the tip of the main branch pipe 20b to the open end 22a of the mixing pipe 22, air is drawn in from around the open end 22a by the ejector effect and flows into the mixing pipe 22, and the mixed gas of fuel gas and air that has passed through the mixing pipe 22 is supplied to the main burner mixing chamber 15c.

[0029] The annular main burner head 16 has a cylindrical wall 16a that extends downward from its outer edge in a short cylindrical shape and forms its outer circumference, with multiple main burner flame holes 16h opening in this cylindrical wall 16a. In the illustrated example, the main burner flame holes 16h are divided into upper and lower sections, with the upper and lower sections of main burner flame holes 16h alternating in the circumferential direction of the cylindrical wall 16a.

[0030] Furthermore, the spark plug 17 is installed close to the outer peripheral wall 15a of the main burner body 15, and a canopy portion 16c is provided extending outward from the upper outer edge of the main burner head 16. When the main burner head 16 is placed on the main burner body 15, the canopy portion 16c covers the top of the spark plug 17. Then, a spark discharge from the spark plug 17 to the main burner head 16 starts the combustion of the mixed gas ejected from the main burner flame hole 16h. In addition, a flame transfer slit 16d, which is a gap for flame transfer in the radial direction, is formed on the upper surface of the main burner head 16. When combustion starts in the main burner flame hole 16h, the flame travels through the flame transfer slit 16d, and the combustion of the mixed gas ejected from the sub-burner flame hole 14h starts.

[0031] A flame sensor 18, consisting of a thermocouple, is installed near the outer peripheral wall 13a of the sub-burner body 13, enabling detection of the flame formed outside the sub-burner flame hole 14h when the sub-burner head 14 is placed on top of the sub-burner body 13. Furthermore, a temperature sensor 40 is installed inserted inside the sub-burner body 13, and the temperature of a cooking container, such as a pot placed on the trivet 4, can be detected by the temperature sensor 40 coming into contact with the cooking container.

[0032] Figure 3 is a longitudinal cross-sectional view showing the internal structure of the gas burner 10 of this embodiment. As described above, the main burner body 15 of the main burner section 12 has an annular main burner mixing chamber 15c with an open top surface formed between the outer peripheral wall 15a and the inner peripheral wall 15b, and the inlet 15d opening at the bottom surface of the main burner mixing chamber 15c and the mixing pipe 22 are connected and in communication by a connecting part 23. Furthermore, when the main burner head 16 is placed on the main burner body 15, a fitting cylinder 16b that is vertically extended downward from the inner edge of the main burner head 16 is fitted inside the inner peripheral wall 15b of the main burner body 15, and the lower end of the cylindrical wall 16a of the main burner head 16 abuts against the upper end of the outer peripheral wall 15a of the main burner body 15, so that the main burner head 16 covers the upper surface of the main burner mixing chamber 15c. The main burner flame hole 16h, which opens in the cylindrical wall 16a of the main burner head 16, is in communication with the main burner mixing chamber 15c. The mixed gas supplied from the mixing pipe 22 to the main burner mixing chamber 15c via the connecting part 23 and the inlet 15d is ejected from the main burner flame hole 16h, and combustion of the mixed gas is started by the spark discharge of the spark plug 17.

[0033] Meanwhile, the sub-burner body 13 of the sub-burner section 11 has an annular sub-burner mixing chamber 13c formed between the outer peripheral wall 13a and the inner peripheral wall 13b, with its upper surface open. In addition, a gas passage 24 is formed, with a sub-branch pipe 20a connected to one end and a nozzle 25 connected to the other end, and a mixing passage 26 is formed, with one end opening opposite the nozzle 25 and the other end connected to the sub-burner mixing chamber 13c. When fuel gas is injected from the nozzle 25 towards the mixing passage 26 through the sub-branch pipe 20a and the gas passage 24, the surrounding air is drawn in by the ejector effect and flows into the mixing passage 26, and the mixed gas of fuel gas and air that has passed through the mixing passage 26 is supplied to the sub-burner mixing chamber 13c.

[0034] In addition, when the sub-burner head 14 is placed on the sub-burner body 13, a fitting cylinder 14b that extends downward in a cylindrical shape from the inner edge of the sub-burner head 14 is fitted inside the inner circumferential wall 13b of the sub-burner body 13, and the lower end of the cylindrical wall 14a of the sub-burner head 14 abuts against the upper end of the outer circumferential wall 13a of the sub-burner body 13, so that the sub-burner head 14 covers the upper surface of the sub-burner mixing chamber 13c. The sub-burner flame hole 14h that opens in the cylindrical wall 14a of the sub-burner head 14 is in communication with the sub-burner mixing chamber 13c, and the mixed gas supplied to the sub-burner mixing chamber 13c through the mixing passage 26 is ejected from the sub-burner flame hole 14h, and as described above, the flame from the main burner flame hole 16h travels through the ignition slit 16d, initiating combustion of the mixed gas.

[0035] Furthermore, a central passage 27 is formed that penetrates vertically through the center of the child burner body 13 (inside the inner peripheral wall 13b) and the center of the child burner head 14 (inside the fitting cylinder 14b), and a temperature sensor 40 is inserted through this central passage 27. The temperature sensor 40 has a contact portion 40a that protrudes above the child burner head 14, and a support pipe 40b to which the contact portion 40a is attached so as to be movable in the vertical direction at its upper end, both of which are made of a metal material such as stainless steel. The contact portion 40a contains a thermistor 40c as a temperature conversion element whose electrical resistance changes according to temperature, and a coil spring 40d that biases the contact portion 40a upward, and a lead wire 40e connected to the thermistor 40c is inserted inside the support pipe 40b. When a cooking container is placed on the trivet 4, the upper end of the contact portion 40a comes into contact with the bottom surface of the cooking container, and the contact portion 40a is pushed down against the biasing force of the coil spring 40d. The temperature transmitted to the upper end of the contact portion 40a in contact with the bottom surface of the cooking container can be detected by the thermistor 40c.

[0036] In conventional gas burners 10, the support pipe 40b for the temperature sensor 40 is typically installed on a base 7 inside the stove body 2. Since the sub-burner body 13 and the support pipe 40b are each attached to the base 7, variations in the manufacturing dimensions of components such as the sub-burner body 13 and the temperature sensor 40, as well as variations in the assembly position relative to the base 7, made it difficult to stabilize the correlation between the sub-burner section 11 (sub-burner body 13 and sub-burner head 14) and the temperature sensor 40 (aligning the central axes of the sub-burner head 14 and the temperature sensor 40). Furthermore, the radiant heat transmitted from the flame formed on the outer circumference of the sub-burner head 14 to the contact portion 40a of the temperature sensor 40 differs, resulting in variations in the temperature detected by the thermistor 40c of the temperature sensor 40. Therefore, in the gas burner 10 of this embodiment, in order to suppress variations in the temperature detected by the temperature sensor 40 inserted through the central passage 27, the support pipe 40b of the temperature sensor 40 is fixed in the following configuration.

[0037] Figure 4 is a perspective view showing the configuration for fixing the support pipe 40b of the temperature sensor 40 in this embodiment. In Figure 4, the sub-burner body 13 is shown upside down so that the bottom surface of the sub-burner body 13 is visible, and accordingly, the contact portion 40a of the temperature sensor 40 is positioned facing downwards, showing the state before the support pipe 40b is fixed. Note that, in order to avoid making the illustration complicated, the mixing pipe 22, sub-branch pipe 20a, main burner body 15, etc. are omitted from the illustration in Figure 4.

[0038] As shown in the figure, four legs 30 are provided protruding from the lower surface of the sub-burner body 13 in this embodiment, and these legs 30 are screwed in while in contact with the upper surface of the base 7 (see Figure 2) inside the stove body 2. In addition, a plurality of plate-shaped fins 31 are suspended from the lower surface of the sub-burner body 13. These plurality of fins 31 are formed together with the sub-burner body 13 by die-casting or casting using zinc, aluminum alloy, brass, etc., and a large surface area can be secured on the lower surface of the sub-burner body 13, thereby promoting heat dissipation from the sub-burner body 13 by thermal radiation and functioning as a so-called heat sink. Note that the plurality of fins 31 may be formed from a different material than the sub-burner body 13.

[0039] Furthermore, in the sub-burner body 13 of this embodiment, multiple fins 31 are arranged radially around the central passage 27. As is well known, when the mixed gas is burning in the sub-burner section 11, an upward airflow is generated in the central passage 27, and as a result, an airflow is easily generated from the radial outside of the sub-burner body 13, passing between the multiple fins 31 and toward the central passage 27. Therefore, heat can be more effectively dissipated from the multiple fins 31 by thermal convection.

[0040] Then, a fixing plate 41 for fixing the support pipe 40b of the temperature sensor 40 is attached to the fins 31 of the child burner body 13. As shown in the figure, the fixing plate 41 is provided with screw holes 32 corresponding to fixing screws 43 and two protrusions 33 that protrude from the fins 31. On the other hand, the fixing plate 41 is provided with through holes 41a for inserting the fixing screws 43 and two notches 41b corresponding to each of the two protrusions 33. By engaging the two notches 41b of the fixing plate 41 with the two protrusions 33, inserting the fixing screws 43 through the through holes 41a, and tightening them into the screw holes 32, the fixing plate 41 is installed in a state where it is positioned at three points relative to the child burner body 13.

[0041] Furthermore, a mounting plate 42, which is integrated with the fixing plate 41, is bent approximately perpendicular to the fixing plate 41, and a retaining plate 44 is provided between the mounting plate 42 and the retaining plate 44 to clamp the support pipe 40b of the temperature sensor 40. The mounting plate 42 has a clamping groove 42a formed vertically, which is a recess with a cross-sectional shape of approximately semicircular, and on the left and right sides of the clamping groove 42a are engagement holes 42c that open to approximately rectangular shapes and screw holes 42d that correspond to fixing screws 45. On the other hand, the retaining plate 44 has a clamping groove 44a formed vertically, which is a recess with a cross-sectional shape of approximately semicircular, and on the left and right sides of the clamping groove 44a are engagement claws 44c that protrude toward the mounting plate 42 and through holes 44d through which fixing screws 45 are inserted.

[0042] The support pipe 40b is positioned by sandwiching it between the clamping groove 42a of the mounting plate 42 and the clamping groove 44a of the retaining plate 44. The retaining plate 44's engaging claw 44c is then engaged with the engaging hole 42c of the mounting plate 42, and a fixing screw 45 is inserted through the through hole 44d and tightened into the screw hole 42d, thereby fixing the support pipe 40b to the fixing plate 41. At this time, the circumferential protrusions 40f provided on the outer circumference of the support pipe 40b can be fitted into the elongated holes 42b formed perpendicular to the clamping groove 42a and the elongated holes 44b formed perpendicular to the clamping groove 44a, thereby allowing the support pipe 40b to be positioned vertically.

[0043] Figure 5 is a perspective view showing the state in which the support pipe 40b of the temperature sensor 40 in this embodiment is fixed. In Figure 5, as in Figure 4, the image is shown upside down so that the lower surface of the child burner body 13 is visible, and hatching is applied to the fixing plate 41 and the mounting plate 42. As described above, the support pipe 40b is clamped between the clamping groove 42a of the mounting plate 42 and the clamping groove 44a of the retaining plate 44, and the fixing plate 41, which is integrated with the mounting plate 42, is installed while being positioned at three points (fixing screws 43 and two protrusions 33) relative to the child burner body 13. As a result, the temperature sensor 40 is fixed to the child burner body 13 along with its position in the central passage 27. The fixing plate 41, mounting plate 42, and retaining plate 44 in this embodiment correspond to the "fixing part" of the present invention.

[0044] As described above, in the gas burner 10 of the present embodiment, the temperature sensor 40 is positioned in the central passage 27 and fixed to the slave burner body 13 by the fixing plate 41 directly installed on the slave burner body 13. Therefore, compared to the case where the fixing portion of the temperature sensor 40 is installed on the pedestal 7 on which the slave burner body 13 is disposed (where the pedestal 7 is interposed between the slave burner body 13 and the fixing portion), the correlation between the slave burner body 13 and the slave burner head 14 and the temperature sensor 40 can be stabilized. As a result, variation in radiant heat transferred from the flame formed on the outer periphery of the slave burner head 14 to the contact portion 40a of the temperature sensor 40 is less likely to occur, and variation in the temperature detected by the thermistor 40c of the temperature sensor 40 can be suppressed.

[0045] Further, in the gas burner 10 of the present embodiment, a plurality of fins 31 are provided on the lower surface of the slave burner body 13 as a heat sink that promotes heat dissipation, and the fixing plate 41 is installed on these fins 31. Since the plurality of fins 31 can ensure a large surface area on the lower surface of the slave burner body 13, heat dissipation from the slave burner body 13 via thermal radiation can be promoted. Although the temperature sensor 40 is connected to the slave burner body 13 via the fixing plate 41 and the fins 31, heat from the slave burner body 13 is dissipated by the plurality of fins 31, so that heat conduction from the slave burner body 13 to the temperature sensor 40 can be reduced. As a result, it is possible to suppress the influence of the temperature rise of the temperature sensor 40 itself on the detected temperature and the deterioration of the temperature sensor 40 caused by high temperature.

[0046] In particular, in the gas burner 10 of the present embodiment, the plurality of fins 31 are arranged radially around the central passage 27. With this configuration, when an updraft is generated in the central passage 27 accompanying combustion of the mixed gas in the slave burner portion 11, an airflow flowing from the radially outer side of the slave burner body 13 through the gaps between the plurality of fins 31 toward the central passage 27 is likely to be generated. Therefore, heat dissipation from the plurality of fins 31 via thermal convection is promoted, and heat conduction to the temperature sensor 40 can be further reduced.

[0047] The gas burner 10 according to the present embodiment has been described above. However, the present invention is not limited to the above embodiments, and can be implemented in various forms without departing from the gist of the present invention.

[0048] For example, in the above-described embodiment, a plurality of plate-shaped fins are provided as a heat sink (heat radiating portion) on the lower surface of the sub-burner body 13. However, the configuration of the heat sink is not limited thereto, and a plurality of needle-shaped protrusions (pins) may be provided on the lower surface of the sub-burner body 13. Since the plurality of pins can ensure a large surface area on the lower surface of the sub-burner body 13, heat radiation from the sub-burner body 13 via thermal radiation can be promoted. Further, heat radiation from the sub-burner body 13 may be promoted by applying a heat-radiating coating or a plating film on the lower surface of the sub-burner body 13.

[0049] Further, in the above-described embodiment, the fixing plate 41 is installed to the fins 31 of the sub-burner body 13 by screwing. However, the fixing plate 41 may be formed integrally with the fins 31 of the sub-burner body 13 by die casting or the like. In addition, in the above-described embodiment, the support pipe 40b of the temperature sensor 40 is sandwiched between the mounting plate 42 and the pressing plate 44. However, the support pipe 40b may be joined to the fixing plate 41 by welding or the like.

[0050] Further, in the above-described embodiment, the screw holes 32 and the protrusions 33 are provided integrally with the plurality of fins 31 on the lower surface of the sub-burner body 13. However, the screw holes 32 and the protrusions 33 may be provided independently between adjacent fins 31. In addition, in the above-described embodiment, the plurality of fins 31 are formed by die casting together with the sub-burner body 13. However, a separate member formed with the plurality of fins 31 may be joined to the lower surface of the sub-burner body 13.

[0051] Furthermore, in the embodiments described above, a gas burner 10 with a double-ring structure (a so-called parent-child burner) was described as an example, in which a large-diameter annular parent burner section 12 is arranged surrounding the outside of a small-diameter annular child burner section 11. However, a gas burner with an upper and lower two-stage structure (a so-called parent-child burner) may also be used, in which an annular parent burner section of approximately the same diameter is arranged above the annular child burner section. Moreover, the application of the present invention is not limited to parent-child burners, and a type without a parent burner section 12 (a so-called single burner) may also be used. However, in a parent-child burner with a double-ring structure, the outer diameter of the inner child burner section 11 tends to be small and limited, and because the distance between the flame formed on the outer circumference of the child burner head 14 and the contact portion 40a of the temperature sensor 40 inserted through the central passage 27 is short, the temperature detected by the temperature sensor 40 is easily affected by the radiant heat of the flame. Therefore, as in the embodiment described above, by applying the present invention to stabilize the correlation between the child burner body 13 and the child burner head 14 and the temperature sensor 40, it becomes possible to suppress variations in the temperature detected by the temperature sensor 40.

[0052] 1...Gas stove, 2...Stove body, 3...Top plate, 4...Trivet, 5...Operating knob, 7...Base, 10...Gas burner, 11...Sub-burner section, 12...Main burner section, 13...Sub-burner body, 13a...Outer wall, 13b...Inner wall, 13c...Sub-burner mixing chamber, 14...Sub-burner head, 14a...Cylindrical wall, 14b...Fitting cylinder, 14h...Sub-burner flame hole, 15...Main burner body, 15a...Outer wall, 15b...Inner wall, 15c...Main burner mixing chamber, 15d...Inlet, 16...Main burner head, 16a...Cylindrical wall, 16b...Fitting cylinder, 16c...Eaves, 16d...Slit, 16h...Main burner flame hole, 17...Spark plug 18...Flame sensor, 20...Gas piping, 20a...Sub-branch piping, 20b...Main branch piping, 21...Nozzle, 22...Mixing pipe, 22a...Open end, 23...Connecting part, 24...Gas passage, 25...Nozzle, 26...Mixing passage, 27...Central passage, 30...Legs, 31...Fins, 32...Screw hole, 33...Protrusion, 40...Temperature sensor, 40a...Contact part, 40b...Support pipe, 40c...Thermistor, 40d...Coil spring, 40e...Lead wire, 40f...Protrusion, 41...Fixing plate, 41a...Through hole, 41b...Notch, 42...Mounting plate, 42a...Clamping groove, 42b...Slotted hole, 42c...Engagement hole, 42d...Screw hole, 43...Fixing screw, 44...Pressing plate, 44a...Clamping groove, 44b...Slotted hole, 44c...Engaging claw, 44d...Through hole, 45...Fixing screw.

Claims

1. A gas burner comprising an annular burner body to which a mixture of fuel gas and air is supplied, and an annular burner head placed on the burner body with its central axis aligned, wherein the gas burner burns the mixture gas ejected from a plurality of flame holes opened on the outer circumference of the burner head, characterized in that the gas burner comprises a temperature sensor inserted through a central passage that vertically penetrates the center of the burner body and the burner head, and whose upper end abuts against the bottom surface of a cooking container placed above the burner head, thereby enabling detection of the temperature of the cooking container, and a fixing part provided on the burner body for fixing the temperature sensor to the burner body, along with positioning it in the central passage.

2. A gas burner according to claim 1, wherein the burner body has a heat dissipation portion on its lower surface to promote heat dissipation, and the fixing portion is provided on the heat dissipation portion.

3. A gas burner according to claim 2, characterized in that a plurality of plate-shaped fins are suspended from the lower surface of the burner body as the heat dissipation section.

4. A gas burner according to claim 3, characterized in that the plurality of fins are arranged radially surrounding the central passage of the burner body.

5. A gas burner according to any one of claims 1 to 4, wherein the burner body comprises an annular first burner body through which the central passage through which the temperature sensor is inserted passes, and a second burner body which is annular in diameter larger than the first burner body and is arranged to surround the outside of the first burner body, and the burner head comprises an annular first burner head which is placed on the first burner body and through which the central passage through which the temperature sensor is inserted passes, and a second burner head which is annular in diameter larger than the first burner head and is placed on the second burner body, and the fixing portion is provided on the first burner body.

6. A cooking appliance equipped with a gas burner according to any one of claims 1 to 4, which heats the cooking container above by combustion from the gas burner.

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