JP6000143B2 - Stove burner - Google Patents

Description

  The present invention relates to a burner for a stove used for a gas stove.

  In general, a stove burner is composed of a mixing tube that supplies a mixed gas of fuel gas and primary air, a burner body that is connected to the mixing tube, and a number of flames that are placed on the burner body along the outer periphery. And an annular burner head forming a hole. The mixed gas ejected from the flame hole of the burner head through the burner body is ignited by a spark plug. The ignition state in the flame hole after ignition is detected by a flame detector incorporating a thermosensitive element such as a thermocouple at the tip, and the main plug of the fuel gas source is controlled by the presence or absence of detection at this time.

  Although a flame detector is provided in the position which contacts the flame formed in the outer periphery of a burner head, the contact degree of a flame changes with the heating power adjustment in the case of cooking. For this reason, if the flame detector is located at a position away from the exit of the flame hole, it may not be possible to detect the flame due to insufficient contact of the flame with the flame detector when a low flame is used when the fire is used. There is.

  Therefore, conventionally, a recess formed so as to be recessed in the radial direction is provided in the burner head, and between the two large flame detection flame holes and the two large flame detection flame holes at the back of the recess. Two small flame detection holes adjacent to each other are provided, and a flame detector tip is disposed in the recess so as to face between the small flame detection flame holes. (See Patent Document 1 below).

  This means that the flame detector is heated mainly by small flames with two small flame detection holes when burning at medium or higher, and mainly when two small flame detection holes are used. It is configured to heat the flame detector with a large flame.

  As a result, even if a fire is used when the heating power is very small, the flames from the four flame holes come into contact so as to sandwich the tip of the flame detector, so that the flame can be reliably detected.

Japanese Patent Publication No. 3-35582

  However, in the above-mentioned conventional one, when a strong fire with a large heating power is used, the amount of gas mixture is increased not only in the small flame detection flame hole but also in the large flame detection flame hole. The tip of the flame detector may be encased in the large flame that is generated.

  In the flame, the outer flame (oxidation flame) has a relatively high temperature, and the inner flame (reduction flame) of the flame has a relatively low temperature. For this reason, when the front-end | tip part of a flame detector is enclosed in the inside of a flame, the flame detection precision falls.

  In view of the above points, the present invention can obtain a good flame contact state with a flame detector from a low flame to a strong flame with a large thermal power, and improves the flame detection accuracy by the flame detector. An object of the present invention is to provide a stove burner having a structure that can be used.

The present invention relates to a mixing pipe that generates a mixed gas of fuel gas and primary air, a burner body that is connected to the mixing pipe, and an annular ring that is placed on the burner body and is suspended from the lower surface of the outer peripheral portion. A burner body for a stove comprising an annular burner head in which a number of flame holes are formed on a wall, and a flame detector having a flame detector for detecting a flame and detecting an ignition state in the flame hole. Is formed in a part of the upper annular surface on which the burner head is placed, and a lower part of the upper annular surface. The flame detector accommodates the flame detector with the flame detector facing the upper annular surface. A burner head, and the burner head has a diameter of the burner head so as to accommodate at least a part of the flame sensing part when the burner head is placed at a predetermined position on the upper annular surface of the burner body. Recessed inward of direction Comprises a flame detection recess formed in Jo, said inflammatory sensing recess is located between the the inner wall surface which is formed in two recesses in the first burner ports, two recesses in the first burner ports And a second flame hole in the recess that forms a flame smaller than the first flame hole in both the recesses, and the second flame hole in the recess has an outlet at the second flame hole in the both recesses. The flames from the first flame holes in the recesses are positioned on the outer side in the radial direction of the burner head from the outlet of one flame hole, and on the both sides in the circumferential direction of the burner head inside the flame detection recess. Bei give a flame-forming space to allow it to be formed toward a direction away from the 2 burner ports, the flame-forming space, the wall surfaces continuous to the edge of the outlet of the first fire hole in each recess characterized that you have been formed in a shape extending in the circumferential direction of and away from the second burner ports in said recess said burner head

  According to the present invention, not only the first flame hole in the recess and the second flame hole in the recess are provided on the back wall surface of the flame detection recess that covers the tip of the flame detector, but also the second flame hole in the recess. Is positioned on the outer side of the burner head in the radial direction with respect to the outlets of the first flame holes in both recesses, and further, a flame forming space is provided inside the both ends of the flame detection recesses. From a high fire to a large fire, a good flame contact state with the flame detector of the flame detector can be obtained.

  That is, when the hot flame and the low flame are used, the flame formed by both the first flame hole in the recess and the second flame hole in the recess is relatively small, but the outlet of the second flame hole in the recess is both The outer flame of the flame in the second flame hole in the recess is flame-detected by being positioned radially outside the burner head from the outlet of the first flame hole in the recess and in proximity to the flame detector of the flame detector. Make sure to touch the part. Thereby, the flame detection unit is sufficiently heated and the flame is reliably detected.

  Moreover, when medium fire and high fire are used, a relatively large flame is formed from the first flame hole in the recess. The flame formed by the second flame hole in the recess is not restricted from the inner surfaces of both ends of the flame detection recess by the flame forming space, and thus extends in a direction away from the second flame hole in the recess. Formed as follows. Thereby, the large flame from the 1st flame hole in a recessed part is located in the side of the front-end | tip part of the flame detector facing the 2nd flame hole in a recessed part, and the external flame contacts a flame detection part. Therefore, at the time of medium and strong fires, the flame detector of the flame detector is heated by the flame of the first flame hole in the recess, and stable flame detection can be performed.

  As described above, according to the present invention, it is possible to obtain a good flame contact state with respect to the flame detector from a low flame to a strong flame with a large thermal power, and improve the flame detection accuracy by the flame detector. be able to.

  Further, the flame detector is accommodated in the flame detector accommodating portion, and at least a part of the flame detector is accommodated in the flame detecting recess, so that the exposure of the flame detector is extremely small and the appearance is improved. .

Further, in the present invention, the burner body may be horizontally inclined to a part of the upper annular surface located outside the outlet of the second flame hole in the recess or downwardly directed toward the radially outer side of the burner body. e Bei the following air guide surface, the secondary air guide surface, Rukoto the flame sensing portion is formed with a through-hole is closed by said inflammatory sensing unit penetrates is preferred.

  By providing the secondary air guide surface, the secondary air is smoothly supplied to the flame detecting recess, so that the flame for detecting the flame can be reliably formed particularly in the second flame hole in the recess. The flame detection accuracy by the flame detector can be further improved.

The side view which shows the burner for stove of embodiment of this invention. The perspective view which shows the spacer of the burner body of this embodiment. Sectional drawing of the recessed part for flame detection in this embodiment. The perspective view of the burner head of this embodiment. Explanatory drawing which shows the positional relationship of the recessed part for flame detection, and a flame detection part. Explanatory drawing which shows the detection state of a flame.

  An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the stove burner of the present embodiment includes a mixing tube 1, a burner body 2, and a burner head 3.

  The mixing tube 1 generates a mixed gas of the fuel gas and the primary air by taking in the fuel gas ejected from a gas nozzle (not shown) together with the primary air.

  A burner body 2 is connected to the downstream end of the mixing tube 1. The burner body 2 includes a base portion 4 formed of a metal plate material and a spacer 5 formed by die casting. A spark plug 6 and a flame detector 7 are provided inside the spacer 5.

  As shown in FIG. 2, the spacer 5 includes an upper annular surface 9. The upper annular surface 9 includes an annular placement portion 9a for placing the burner head 3 and an outer upper surface 9b formed along the outer periphery of the placement portion 9a. The mounting portion 9a is an inclined surface that descends toward the center. The outer upper surface 9 b is an inclined surface that gradually descends outward in the radial direction of the spacer 5.

  As shown in FIG. 1, the spacer 5 is exposed from a top plate 10 that closes an upper surface of a gas stove casing (not shown). A burner opening 11 is formed in the top plate 10, and a gap formed between the burner opening 11 and the spacer 5 is closed by an annular closing plate 12. Since the spacer 5 is formed by die casting, it is suitable for exposing from the top plate 10 because of its high aesthetics and high deformation strength.

  As shown in FIG. 3, a flame detector accommodating portion 13 for accommodating the flame detector 7 is formed inside the outer peripheral wall of the spacer 5 and inside the lower annular surface 9. The flame detector 7 includes a rod-like main body portion 7a and a flame detection portion 7b which is provided at the tip of the main body portion 7a and has a smaller diameter than the main body portion 7a. As shown in FIG. 1, the flame detector 7 is fixed to the spacer 5 via a support piece 14 attached to the outer peripheral wall of the spacer 5.

  As shown in FIG. 3, the flame detector accommodating portion 13 forms a vertically long space along the inner surface of the outer peripheral wall of the spacer 5. A horizontal flat surface 15 formed on a part of the upper annular surface 9 is formed on the upper portion of the flame detector accommodating portion 13. A through hole 16 is formed in the flat surface 15 so as to penetrate vertically. The tip of the flame detector 7 passes through the through hole 16, and the flame detector 7 b protrudes on the flat surface 15. The upper end of the through hole 16 matches the outer diameter of the tip of the flame detector 7, and the tip of the flame detector 7 passes through the through hole 16, thereby closing the upper portion of the flame detector housing 13. It will be in the state.

  As shown in FIGS. 2 and 3, the flat surface 15 is formed from the outer upper surface 9b of the upper annular surface 9 to a part of the mounting portion 9a, and the mounting portion 9a and the outer upper surface of the upper annular surface 9 are formed. The shape is such that the boundary (the most raised part) with 9b is crushed and formed flat.

  As shown in FIG. 4, the burner head 3 includes an annular wall 17 that is formed in an annular shape and is suspended from the lower surface of the outer peripheral portion. The annular wall 17 is formed with a large number of grooves arranged along the circumferential direction and extending in the radial direction. When the annular wall 17 abuts on the mounting portion 9 a of the spacer 5, a number of cooking flame holes 18 are formed along the outer periphery of the burner head 3 by the grooves of the annular wall 17. A drooping cylinder 19 concentric with the annular wall 17 is provided on the inner periphery of the burner head 3.

  As shown in FIG. 1, when the burner head 3 is placed on the spacer 5, the drooping cylinder 19 forms a hollow portion that vertically penetrates the central portion of the burner body 2 and the burner head 3. A pan bottom temperature sensor 21 is provided. An annular cover plate 22 is provided on the upper part of the burner head 3 to prevent foreign matter from entering the inside of a gas stove casing (not shown) from the hollow portion.

  As shown in part in FIG. 3, an annular distribution chamber 23 communicating with the mixing tube 1 is formed between the hanging cylinder 19 of the burner head 3 and the inner surface of the spacer 5. The mixed gas entering the distribution chamber 23 from the mixing tube 1 is distributed in the circumferential direction of the burner head 3 and ejected from the cooking flame hole 18.

  Further, as shown in FIG. 4, the burner head 3 is formed with a flame detection recess 24 having a shape that is recessed inward in the radial direction. As illustrated in FIG. 5, the flame detection recess 24 is provided corresponding to the flat surface 15 from which the flame detection portion 7 b of the flame detector 7 projects when placed on the placement portion 9 a of the spacer 5. It has been. As shown in FIG. 3, most of the flame detector 7 b of the flame detector 7 is accommodated and covered by the flame detection recess 24. Thereby, the presence of the flame detector 7 is not conspicuous, and the appearance of the stove burner is good.

  Further, as shown in FIG. 3, the flat surface 15 does not have a raised portion at the boundary between the mounting portion 9a and the outer upper surface 9b in front of the flame detecting recess 24. Thus, the flame detection recess 24 is completely released from the radially outer side of the spacer 5.

  As shown in FIG. 4, two in-recess first flame holes 25 and one in-recess second flame hole 26 are formed on the inner wall surface of the flame detection recess 24. The mixed gas is supplied from the distribution chamber 23 to the first in-recess flame hole 25 and the second in-recess flame hole 26 in the same manner as the cooking flame hole 18. The in-recess first flame hole 25 forms a flame having the same size as the cooking flame hole 18. As shown in FIG. 5, the second in-recess flame hole 26 is located at the center of the first in-recess flame holes 25 and forms a smaller flame than the first in-recess flame hole 25.

  As shown in FIGS. 3 and 5, the flame detector 7 b of the flame detector 7 faces the front of the outlet of the second flame hole 26 in the recess. Further, as shown in FIG. 5, the outlet of the in-recess second flame hole 26 is located on the outer side of the burner head 3 in the radial direction than the outlets of the first in-recess first flame hole 25. As a result, the distance between the outlet of the second flame hole 26 in the recess and the flame detector 7b of the flame detector 7 is the distance between the outlet of the first flame hole 25 in the recess and the flame detector 7b of the flame detector 7. Small compared to the distance.

  Further, as shown in FIGS. 4 and 5, flame forming space portions 27 are formed on both sides of the burner head 3 in the circumferential direction inside the flame detecting recess 24. The flame forming space portion 27 is provided so as to allow the flame from each first in-recess first flame hole 25 to be formed in a direction away from the second in-recess flame hole 26.

  Next, detection of the ignition state by the flame detector 7 will be described. In the present embodiment, an example in which a thermocouple is used as the flame detector 7 is shown. The thermocouple maintains an open state of an electromagnetic valve interposed in a fuel gas supply line (not shown) by an electromotive force when heated by a flame. As a result, if the stove burner burns well, the open state of the solenoid valve is maintained by the output of the thermocouple. Further, when the burner for the stove in the combustion state is inadvertently extinguished for some reason, the output of the thermocouple decreases, and the solenoid valve is closed. This prevents the unburned mixed gas from flowing out.

  However, if the thermocouple is not heated sufficiently by the flame when the stove burner burns, the fuel gas supply is stopped by the closing of the solenoid valve despite the good combustion, and cooking cannot be continued. . On the other hand, according to the above-described configuration of the present embodiment, the ignition state can be reliably detected by the flame detector 7, so that the fuel gas is supplied to the stove burner despite good combustion. Can be prevented from stopping.

  FIG. 6A schematically shows the state of contact of the flame with the flame detection unit 7b of the flame detector 7 when the fire is used as a small thermal power by adjusting the thermal power during cooking. As shown in FIG. 6 (a), when the heating power is adjusted to the hot flame, the distance between the outlet of the second flame hole 26 in the recess and the flame detector 7b of the flame detector 7 is small. The outer flame (oxidation flame) of the flame of the two flame holes 26 comes into contact with the flame detector 7 b of the flame detector 7. As a result, the flame detector 7b of the flame detector 7 is reliably heated, and ignition is detected. At this time, since the outlets of the first flame holes 25 in both the recesses are located on the deeper side of the flame detecting recess 24 than the outlet of the second flame hole 26 in the recess, a flame is formed in the first flame hole 25 in the recess. Even if this is done, it is prevented that the secondary air is taken away by the flame and the second flame hole 26 in the recess is deficient in oxygen.

  Further, as shown in FIG. 3, the flat surface 15 from which the flame detector 7b of the flame detector 7 projects is horizontal, unlike the inclined direction of the other part of the outer periphery of the mounting portion 9a. Secondary air easily flows from the outside toward the inside of the flame detection recess 24. Thereby, even if the second flame hole 26 in the recess is formed in the inner wall surface of the recess 24 for detecting the flame, sufficient secondary air is supplied, and the flame in the second flame hole 26 in the recess is surely formed. The In the present embodiment, the flat surface 15 is horizontally formed. However, the surface may be gradually inclined downward toward the radially outer side of the spacer 5.

  Furthermore, since the flame detector 7b of the flame detector 7 penetrates the through hole 16 of the flat surface 15 and simultaneously closes the through hole 16, it rises along the flame detector 7b via the through hole 16. Such an air flow is unlikely to occur. Thereby, while supplying sufficient secondary air along the flat surface 15, it is possible to suppress the excess air flow and stably form the flame in the second flame hole 26 in the recess.

  FIG. 6B schematically shows the state of contact of the flame with the flame detector 7b of the flame detector 7 when a strong fire that is the maximum heating power is used by adjusting the heating power during cooking. As shown in FIG. 6B, when the heating power is adjusted to a strong fire, the flame of the first flame hole 25 in the recess is formed large. A large flame from the first flame hole 25 in the recess extends slightly away from the second flame hole 26 side in the recess by the flame forming space 27 of the flame forming space 27. And the flame of the 1st flame hole 25 in a recessed part is located in the side of the flame detection part 7b of the flame detector 7, and an external flame (oxidation flame) contacts the flame detection part 7b of the flame detector 7. FIG. Thereby, the flame detector 7b of the flame detector 7 is reliably heated by the flame of the first flame hole 25 in the recess, and the ignition is detected. At this time, although the flame of the second flame hole 26 in the recess is slightly increased, the outer flame (oxidation flame) of the flame in the first flame hole 25 in the recess is in contact with the flame sensing unit 7b, so The influence of the internal flame (reducing flame) of the flame of the second flame hole 26 does not occur.

  Although not shown, the flame of the second flame hole 26 in the recess is also detected by the flame detector 7b of the flame detector 7, even when a medium flame between the hot flame and the high flame is used by adjusting the heating power during cooking. At the same time, the flame of the first flame hole 25 in the recess comes into contact with the flame detector 7b of the flame detector 7. In this case, although the flame of the first flame hole 25 in the recess is not as strong as in the case of a strong fire, it extends in a direction away from the second flame hole 26 side in the recess by the flame forming space portion 27, ) Contacts the flame detector 7b of the flame detector 7. Thereby, since the flame detection part 7b of the flame detector 7 is heated reliably, it will be in the state by which ignition was detected.

  As described above, according to the stove burner having the above-described configuration, the flame detection unit 7b of the flame detector 7 is surely heated regardless of whether the fire is strong or strong, so that the ignition state can be reliably detected. Can be performed accurately.

  DESCRIPTION OF SYMBOLS 1 ... Mixing pipe, 2 ... Burner body, 3 ... Burner head, 7 ... Flame detector, 7b ... Flame detector, 9 ... Upper annular surface, 13 ... Flame detector accommodating part, 15 ... Flat surface (secondary air guide Surface), 17 ... annular wall, 18 ... cooking flame hole (flame hole), 24 ... flame detection recess, 25 ... first flame hole in the recess, 26 ... second flame hole in the recess, 27 ... space for flame formation Department.

Claims (2)

A mixing tube for generating a mixed gas of fuel gas and primary air, a burner body connected to the mixing tube, and a large number of annular walls placed on the burner body and suspended from the lower surface of the outer peripheral portion In a burner for a stove comprising an annular burner head in which a flame hole is formed, and a flame detector that has a flame detector for detecting a flame and detects an ignition state in the flame hole,
The burner body is formed in a part of an upper annular surface on which the burner head is placed and a lower inner portion of the upper annular surface, and the flame detector is placed on the upper annular surface to accommodate the flame detector. And a flame detector housing
The burner head faces inward in the radial direction of the burner head so as to accommodate at least a part of the flame sensing unit when the burner head is placed at a predetermined position on the upper annular surface of the burner body. With a flame detection recess formed in a recessed shape,
It said inflammatory sensing recess is opposed to the flame sensing unit located between the the inner wall surface which is formed in two recesses in the first burner ports, two recesses in the first burner ports, both recess A second flame hole in the recess that forms a flame smaller than the first flame hole,
The outlet of the second flame hole in the recess is located on the outer side in the radial direction of the burner head with respect to the outlet of the first flame hole in both the recesses,
A flame that allows a flame from each first flame hole in each recess to be formed in a direction away from the second flame hole in each recess on both sides in the circumferential direction of the burner head inside the flame detection recess. Bei to give a forming space,
The flame-forming space is Rukoto wall that is continuous with the edge of the outlet of the first fire hole in each recess, separated from the second burner ports in said recess is formed in a shape extending in the circumferential direction of the burner head Stove burner characterized by The burner body is provided with a secondary air guide surface inclined at a part of the upper annular surface located outside the outlet of the second flame hole in the recess horizontally or downwardly toward the radially outer side of the burner body. Huh,
The secondary air guide surface, stove burner according to claim 1, wherein said flame sensing unit is characterized that you have formed the through hole is closed by said inflammatory sensing unit penetrates.

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