JP7113649B2 - stove burner - Google Patents

Description

TECHNICAL FIELD The present invention relates to a stove burner provided on a gas stove.

This type of stove burner includes a mixing tube portion extending outward from a peripheral wall of a body portion that is circular in plan view. A primary air intake is provided at the upstream end of the mixing pipe to take in primary air together with the fuel gas.

Primary air taken in from the primary air intake portion is mixed with the fuel gas while flowing along the mixing tube portion. The mixed gas produced in the mixing tube is introduced into an annular distribution chamber formed inside the body. The mixed gas in the distribution chamber is supplied to the flame port of the head mounted above the body to form a flame, and the stove burner is in a combustion state.

A mixing pipe portion in a conventional stove burner is provided at a position where the center line thereof extends toward the center of the body portion (see, for example, Patent Document 1). For this reason, the mixed gas entering the distribution chamber from the mixing pipe section collides with the inner peripheral wall surface of the body section and is split to both sides to reach the distribution chamber on the opposite side of the mixing pipe section.

JP-A-7-139735

By the way, it is well known that the mixing tube must be long enough to produce a well-burning gas mixture. Therefore, if the length of the mixing pipe is shortened in order to make the stove burner compact, the amount of primary air mixed will be reduced, making it impossible to generate a mixed gas that provides a good combustion state. .

In addition, in the above-described conventional burner for stove, the mixed gas entering the distribution chamber from the mixing tube portion is diverted, so that the speed at which the mixed gas spreads over the entire circumference of the distribution chamber is relatively high. As a result, although the response of the flame to the heating power adjustment is fast, when the heating power is abruptly changed during the heating power adjustment, the flame cannot follow the change in the supply amount of the mixed gas, and the flame stabilizing property may deteriorate. For this reason, for example, there is a possibility that accurate flame detection cannot be performed.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a stove burner that is compact while taking in sufficient primary air to obtain a good combustion state, and that achieves high flame stability.

In order to achieve such an object, the present invention comprises a body having a circular shape in plan view and having a distribution chamber formed therein, and a plurality of flame ports mounted on the body and extending along the upper periphery of the distribution chamber. a mixing tube portion extending outwardly from the body portion for generating a mixed gas of fuel gas and primary air and guiding it to the distribution chamber; and primary air along with the fuel gas in the mixing tube portion. a primary air intake section for taking in the mixing tube section, the center line along the extension direction of the mixing tube section extends linearly, and an ignition electrode for igniting the flame port and an ignition electrode for igniting the flame port outside the body portion; and a flame detector for detecting a flame, wherein the body has a central tubular part with top and bottom openings, and the mixing tube part has the center line spaced laterally from the center of the body. The distribution chamber includes a linear flow section in which the mixed gas flows linearly along the center line of the mixing pipe section, and a linear flow section in which the mixed gas continues downstream from the linear flow section. and a circulating flow portion that flows in a circular shape along the outer peripheral wall of the barrel portion, and the circulating flow portion is bounded by a straight line that is perpendicular to the center line of the mixing tube portion and extends through the center of the barrel portion. When the flow section is divided into two regions, an upstream side and a downstream side, the ignition electrode and the flame detector are arranged at a position corresponding to the downstream side region of the orbiting flow section, and are located in the distribution chamber. A backflow prevention wall is provided at the downstream end of the circular flow section and extends between the central cylindrical section and the inner surface of the outer peripheral wall of the body section. a resistance imparting portion that imparts passage resistance to the mixed gas when passing through the boundary portion between the linear flow portion and the circular flow portion; It extends along the outer peripheral side of the central cylindrical portion, which is the inner peripheral wall of the circulating flow portion, in the lower half of the vertical height of the distribution chamber in the range of the first curve to the upstream portion. It is characterized by

In the stove burner of the present invention, the centerline of the mixing tube extends laterally away from the center of the barrel. Therefore, the mixing tube is connected at a position laterally displaced from the center of the barrel. The extension of the center line of the mixing pipe portion extends to the outer peripheral wall of the distribution chamber without abutting against the inner peripheral wall at the center of the annular distribution chamber. Therefore, even if the length of the mixing tube portion is the same as that of the conventional stove burner, the length of the entire stove burner including the mixing tube portion and the body portion is shorter than that of the conventional stove burner.

As a result, it is possible to take in a sufficient amount of primary air and obtain a good combustion state while being compact.

Also, the mixed gas introduced laterally from the center of the distribution chamber flows inside along the shape of the annular distribution chamber. At this time, compared to the pressure change (increase or decrease) of the mixed gas in the distribution chamber on the upstream side where the mixed gas is introduced, the pressure change of the mixed gas in the distribution chamber on the downstream side after flowing around the annular distribution chamber is delayed. For this reason, for example, even if the user performs an operation to rapidly change the flame from high to low, and the pressure of the mixed gas in the distribution chamber on the upstream side drops sharply, the pressure of the mixed gas in the distribution chamber on the downstream side will be Since the pressure drops slowly, high flame stability can be obtained.

Furthermore, the ignition electrode and the flame detector are arranged at a position corresponding to the downstream side region of the orbiting flow section (that is, the substantially downstream half region of the orbiting flow section). The overall length of the stove burner can be shortened compared to the case where the ignition electrode and the flame detector are provided on the side opposite to the extension side. Moreover, when the flame detector is placed outside the circulation flow section, which is the downstream side of the distribution chamber, the flame can be detected at a position with high flame stability, so the accuracy of flame detection can be improved. .

In the distribution chamber, the pressure of the mixed gas rises at the boundary between the linear flow section and the circular flow section (where the mixed gas introduced from the mixing tube crosses the upstream linear flow section and enters the circular flow section). relatively high. Therefore, a resistance imparting portion is provided to impart passage resistance to the mixed gas passing through the boundary portion between the linear flow portion and the circular flow portion. As a result, it is possible to suppress the partial pressure rise of the mixed gas in the distribution chamber. Heat distribution can be made uniform.

BRIEF DESCRIPTION OF THE DRAWINGS The explanatory perspective view which shows the burner for stoves of embodiment of this invention. FIG. 2 is an explanatory plan view of the stove burner in FIG. 1 ; FIG. 3 is an explanatory perspective view showing the mixing tube and the upper half of the distribution chamber removed; The graph which shows the pressure difference of the mixed gas in a distribution chamber.

An embodiment of the present invention will be described based on the drawings. A stove burner 1 of the present embodiment is provided in a gas stove (not shown), and as shown in FIGS. It has a head portion 4 forming a mouth 3 and a mixing pipe portion 5 for supplying a mixed gas of fuel gas and primary air to the body portion 2 .

A primary air intake portion 6 is provided at the upstream end of the mixing tube portion 5 . The mixing tube portion 5 takes in the fuel gas ejected from a gas nozzle (not shown) together with the primary air from the primary air intake portion 6 to generate a mixed gas of the fuel gas and the primary air.

The drum portion 2 is connected to the downstream end of the mixing pipe portion 5 . The trunk portion 2 is provided with a central cylindrical portion 7 (lower half portion is shown in FIG. 3) which is open at the top and bottom. A pot bottom temperature sensor 8 is provided through the central cylindrical portion 7 .

The trunk portion 2 includes a trunk portion body portion 9 and an exposed annular portion 10 that is connected to the trunk portion body portion 9 and exposed on the upper surface side of a stove top plate (not shown). An annular head mounting surface 11 is formed on the upper surface of the exposed annular portion 10 . The head 4 has a hanging wall 12 at its peripheral edge, and the hanging wall 12 is formed with a plurality of grooves that become the flame ports 3 when placed on the head mounting surface 11 of the exposed annular portion 10 .

As shown in FIG. 3 , an annular distribution chamber 13 communicating with the mixing tube portion 5 is formed inside the body portion 9 . The distribution chamber 13 has a linear flow section 14 and a circular flow section 15 . The linear flow section 14 is a section through which the mixed gas introduced from the mixing pipe section 5 flows linearly. The circular flow portion 15 is formed in a circular shape continuously from the linear flow portion 14 along the inner surface of the outer peripheral wall 16 of the body portion 2 .

Further, as shown in FIGS. 2 and 3, the mixing tube portion 5 is provided at a position that is biased to one side with respect to the body portion 2 . As shown in FIG. 3, the mixing tube portion 5 is shaped such that its center line x extends linearly. Furthermore, the mixing tube portion 5 has its center line x at a position that extends laterally from the center s of the body portion 2 (that is, the extension line x' of the center line x of the mixing tube portion 5 extends from the body portion 2). ) extends into the straight flow section 14 at a position that does not pass through the center s of the Therefore, the mixed gas introduced from the mixing tube portion 5 into the distribution chamber 13 maintains the same flow direction as the mixing tube portion 5 while flowing through the linear flow portion 14 of the distribution chamber 13 . The linear flow section 14 of the distribution chamber 13 therefore functions as an extended part of the mixing tube section 5 .

If the length of the mixing pipe portion 5 is shortened, there is a risk that a sufficient amount of primary air will not be mixed. function as a part of the mixing tube portion 5, a sufficient amount of primary air can be obtained even if the mixing tube portion 5 is shortened. Therefore, the overall length of the stove burner 1 can be shortened and compact without lowering the combustion performance.

Further, in the distribution chamber 13, the mixed gas flows from the linear flow section 14 on the upstream side to the circular flow section 15 on the downstream side. A pressure difference occurs between

The inventor conducted a test comparing the pressure of the mixed gas in the distribution chamber 13 between the upstream position U and the downstream position D of the distribution chamber 13 . As a result, as shown in FIG. 4, it was found that the pressure drop at the downstream position D (line d) was slower than the pressure drop at the upstream position U (line u).

As a result, for example, even if the user performs an operation to rapidly change the flame from high to low, the pressure of the mixed gas on the downstream side drops with a delay, resulting in high flame stability.

As shown in FIG. 2, an ignition electrode 17 and a thermocouple 18 (flame detector) are attached to the body 2 so as to protrude upward through the exposed annular portion 10 . The ignition electrode 17 and the thermocouple 18 are arranged laterally of the mixing tube portion 5 outside the circular flow portion 15 .

Incidentally, the ignition electrode 17 and the thermocouple 18 will be described with reference to FIG. is preferably provided outside the A straight line y is an imaginary line perpendicular to the center line x of the mixing tube portion 5 and passing through the center s of the body portion 2 . When the orbital flow section 15 is divided into an upstream area and a downstream area with the straight line y as a boundary, the ignition electrode 17 and the thermocouple 18 are located at any position within the range corresponding to the downstream area in the orbital flow section 15. In this embodiment, the position shown in FIG. 2 is adopted as the most preferable example.

According to this, since the outer protrusion of the body portion 2 for providing the ignition electrode 17 and the thermocouple 18 is located on the side where the mixing tube portion 5 extends, the stove burner 1 can be made more compact. can do. Moreover, when the stove burner 1 is attached to a gas stove (not shown), the mixing tube portion 5 is generally positioned at the rear side due to the relationship of fuel gas piping and the like. Therefore, the ignition electrode 17 and the thermocouple 18 provided on the side where the mixing tube portion 5 extends are located behind the head portion 4 and are difficult to see, thereby preventing deterioration of the appearance of the stove burner 1. be able to.

Also, the ignition electrode 17 and the thermocouple 18 are positioned downstream in the distribution chamber 13 . As described above, the downstream side of the distribution chamber 13 is a position with high flame stability, and by detecting flames at this position, the accuracy of flame detection is improved.

Further, as shown in FIG. 3, in the distribution chamber 13, from the boundary portion between the linear flow portion 14 and the circular flow portion 15 to the upstream portion of the circular flow portion 15 (that is, to the first curve), A resistance applying portion 19 protruding inwardly of the chamber 13 is formed. The resistance imparting portion 19 is provided along the lower part of the inner peripheral wall of the orbiting flow portion 15, and by narrowing the flow passage cross-sectional area of the upstream portion of the orbiting flow portion 15, the mixed gas passing through the position is resisted. to give

A relatively large pressure rise may occur at the boundary between the linear flow section 14 and the circular flow section 15, but by providing the resistance applying section 19, it is possible to suppress the formation of large thermal power due to the pressure rise.

Moreover, since the resistance applying portion 19 is provided in the upstream portion of the circular flow portion 15, the speed of the mixed gas passing through the resistance applying portion 19 and heading toward the downstream portion of the circular flow portion 15 increases. An extreme pressure difference between the upstream portion and the downstream portion of 13 can be moderately suppressed. As a result, the shape of the flame formed at each flame port 3 of the head 4 is made uniform, and a uniform heat distribution can be obtained over the entire circumference of the head 4 during combustion.

A backflow prevention wall 20 is provided at the downstream end of the circulation flow section 15 . By providing the backflow prevention wall 20, the mixed gas flow from the upstream portion of the linear flow section 14 to the downstream end of the circulating flow section 15 is restricted. As a result, backflow of the mixed gas in the circulation flow section 15 can be reliably prevented.

In the present embodiment, an example in which the resistance applying portion 19 is positioned below the inner peripheral wall of the circular flow portion 15 was given, but the resistance applying portion in the present invention includes the linear flow portion 14 and the circular flow portion 15. Although not shown, it may be provided on the inner surface of the outer peripheral wall 16, the bottom surface, or the like. In addition, when the thermal power generation at the boundary between the linear flow section 14 and the circumferential flow section 15 is moderately suppressed, or when the flame stability is extremely reduced, the resistance applying section 19 may not be provided. .

DESCRIPTION OF SYMBOLS 1... Burner for stove, 2... Body part, 3... Flame port, 4... Head, 5... Mixing pipe part, 6... Primary air intake part, 13... Distribution chamber, 14... Linear flow part, 15... Circular flow part , 17... Ignition electrode, 18... Thermocouple (flame detector), 19... Resistance applying part, 20... Backflow prevention wall, x... Center line of mixing tube part, s... Center of head.

Claims (1)

A body having a circular shape in plan view and having a distribution chamber formed therein; a head placed on the body and forming a plurality of flame ports along the upper outer circumference of the distribution chamber; a mixing pipe portion that extends in the direction of the fuel gas and primary air to generate a mixed gas of the fuel gas and the primary air and guide it to the distribution chamber; and a primary air intake portion that takes in the primary air together with the fuel gas into the mixing pipe portion. A stove for a stove provided with an ignition electrode for igniting the flame port and a flame detector for detecting the flame of the flame port on the outside of the barrel, with the center line extending linearly along the extending direction of the pipe portion. in the burner,
The trunk portion has a central cylindrical portion that is open at the top and bottom,
The mixing tube portion is provided at a position where the center line extends laterally apart from the center of the body portion,
The distribution chamber includes a linear flow section in which the mixed gas flows linearly along the center line of the mixing pipe section, and an outer peripheral wall of the trunk section where the mixed gas continues downstream from the linear flow section. and a circumferential flow portion that flows in a circumferential shape along
When the circulating flow section is divided into two regions, an upstream side and a downstream side, with a straight line perpendicular to the center line of the mixing tube section and extending through the center of the body section as a boundary, the ignition electrode and the The flame detector is arranged at a position corresponding to the region on the downstream side of the circulating flow section, and is located at the downstream end of the circulating flow section of the distribution chamber between the central cylindrical section and the inner surface of the outer peripheral wall of the trunk section. Equipped with a backflow prevention wall between
The distribution chamber includes a resistance imparting portion that imparts passage resistance to the mixed gas when the mixed gas passes through the boundary portion between the linear flow portion and the circular flow portion,
The resistance-applying portion is located in the lower half of the height of the distribution chamber in the vertical direction in the first curve from the boundary portion between the linear flow portion and the circulating flow portion to the upstream portion of the circulating flow portion. 2. A burner for a stove, characterized in that it extends along the outer peripheral side of the central cylindrical portion which is the inner peripheral wall of the circular flow portion .

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