JP2009074727A - Burner for cooking stove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a burner from being ignited in a state that an upper head member is not disposed by mistake to prevent the generation of flashback and defective combustion caused by the transfer of flame to an air-fuel mixture for an upper burner port, in the burner for a cooking stove comprising upper and lower burner ports of two stages and an ignition burner port at the peripheral face of a burner head, and composed of two members of a lower head member defining the lower burner port with a burner body, and an upper head member defining the upper burner port with the lower head member. <P>SOLUTION: A target portion 55 opposed to an ignition plug 10 is disposed on one of the lower head member 51 and the upper head member 52. The ignition burner port 61 is formed at the peripheral face of the lower head member 51 at the lower side of the target portion 55, and communicates with a space between the lower head member 51 and the upper head member 52. Further the ignition burner port 61 is inclined downward toward the peripheral face of the lower head member 51. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a burner for a stove provided with upper and lower two-stage flame openings opened on a peripheral surface of a burner head provided on a burner body.

  Conventionally, as this type of stove burner, the burner head is composed of two members, a lower head member and an upper head member, and a lower flame port is defined between the burner body and the lower head member. An apparatus in which an upper flame mouth is defined between the upper head member and the upper head member is known (for example, see Patent Document 1). In this case, one of the lower flares is used as an ignition igniter that is ignited by an ignition plug, and the other lower and upper flares are ignited and ignited by ignition to the ignition flame.

  By the way, the burner head provided in the general stove burner is composed of a single member, and the burner head composed of two members as in the conventional example is special. Therefore, there is a possibility that the user installs only the lower head member on the burner body after cleaning the burner head and forgets to install the upper head member. Here, in the above-described conventional example, even if the upper head member is not installed, an ignition flame port constituted by one of the lower flame ports defined between the burner body and the lower head member is used. Ignition is performed, and it is transferred to the other lower crater. Then, the mixture for the upper flame outlet, which is illegally discharged upward without the upper head member defining the upper flame outlet, is transferred from the lower flame outlet to cause backfire and combustion failure.

It is also conceivable that the burner head is composed of a single member and the upper flame opening is formed by a hole drilled in the burner head. However, this is not practical because it becomes difficult to clean when the upper flame mouth is clogged due to boiling over.
Japanese Patent No. 3586974

  In view of the above points, the present invention provides a stove burner that prevents the burner from being ignited in a state in which the upper head member is forgotten to be installed, thereby avoiding the occurrence of flashback and poor combustion. It is an issue.

  In order to solve the above-mentioned problems, the present invention is a stove burner comprising an upper and lower two-stage flame opening opened on a peripheral surface of a burner head provided on a burner body and an ignition flame opening ignited by a spark plug. The burner head is composed of two members: a lower head member that defines a lower flame port with the burner body, and an upper head member that defines an upper flame port with the lower head member. A target portion is provided on one of the lower head member and the upper head member so as to face the spark plug, and an ignition flame opening is formed in a peripheral surface portion of the lower head member on the lower side of the target portion. It is provided so as to communicate with the space between the member and the upper head member, and a part of the air-fuel mixture for the upper stage flame flowing into the space is caused to flow into the ignition flame port.

  According to the present invention, in the state in which the upper head member is forgotten to be installed, the air-fuel mixture for the upper flame outlet is released upward without being regulated by the upper head member. The air-fuel mixture is no longer supplied, and the ignition port becomes unignitable. Accordingly, it is possible to avoid backfire and poor combustion due to ignition when the upper head member is forgotten to be installed.

  If the target part is provided on the upper head member, if the upper head member is forgotten to be installed, an irregular spark discharge is performed between the spark plug and the lower head member, and the lower flame outlet is ignited. There is a possibility. On the other hand, if the target portion is provided on the lower head member, even if the upper head member is forgotten to be installed, a spark discharge is generated between the target portion and the spark plug. It can be prevented that the flame is ignited.

  In the present invention, the ignition flame port is preferably formed so as to be inclined downward toward the peripheral surface of the lower head member. According to this, unless the upper head member restricts the upward flow of the upper-stage flame mixture, the mixture does not flow through the ignition flame hole inclined downward. Therefore, ignition to the ignition flame port in a state where the upper head member is forgotten to be installed can be prevented more reliably.

  In addition, when the ignition flame hole is formed by a hole drilled in the lower head member, in order to prevent backfire from the ignition flame hole to the space between the lower head member and the upper head member, Needs to be 2 mm or less. However, when the hole diameter is about 2 mm, water cannot be drained if the ignition flame port is sealed with water by cleaning the lower head member. In this case, an inflow groove having a groove width smaller than the diameter of the ignition flame port is provided in the communication part of the ignition flame port with respect to the space between the lower head member and the upper head member, and the air-fuel mixture for the upper flame inlet flows in. If it is allowed to flow into the ignition flame port through the groove, backfire can be prevented by the inflow groove having a small groove width, so that the diameter of the ignition flame hole can be increased and water can be easily drained. is there.

  With reference to FIG. 1, 1 is a stove body, 2 is a top plate that covers the upper surface of the stove body 1, and 3 is a burner for the stove. The top plate 2 is provided with a burner opening 2a. On the top plate 2, five virtues (not shown) are placed so as to surround the burner opening 2 a. Then, the cooking container placed on the five virtues is heated by the burner 3.

  The burner 3 includes a burner body 4 inserted through the burner opening 2 a and a burner head 5 on the burner body 4. On the peripheral surface of the burner head 5, as shown in FIG. 2, a number of upper and lower two-stage flame ports 6U and 6L are opened with a circumferential interval, and an ignition flame port 6I is formed at one circumferential direction. It is open. Here, in order to prevent the flame from touching the five virtue claws and incomplete combustion, the upper flame ports 6U are not provided at a plurality of locations in the circumferential direction that match the plural virtue claws of the five virtues. Accordingly, the number of the lower flame ports 6L is slightly larger than the number of the upper flame ports 6U. However, the area of each lower flame port 6L is much smaller than the area of each upper flame port 6U, so the total area of the lower flame port 6L is smaller than the total area of the upper flame port 6U.

  The burner body 4 is composed of an inner and outer triple cylinder including an outer cylinder 41, an intermediate cylinder 42, and an inner cylinder 43. Further, the burner head 5 is fitted into an annular lower head member 51 having a cylindrical portion 51a fitted to the intermediate cylinder 42 of the burner body 4 on the inner periphery and an inner cylinder 43 of the burner body 4 on the inner periphery. It is comprised with the cyclic | annular upper head member 52 which hung the cylindrical part 52a which unites. An upper annular wall 53 on which the upper head member 52 is seated is erected on the outer peripheral portion of the upper surface of the lower head member 51, and a number of grooves serving as the upper flame ports 6 </ b> U are spaced apart in the circumferential direction on the upper annular wall 53. Is formed. The upper ends of these grooves are closed by the upper head member 52, so that an upper flame port 6 </ b> U is defined between the lower head member 51 and the upper head member 52. Further, a lower annular wall 54 seated on the upper end portion of the outer cylinder 41 of the burner body 4 is suspended from the outer periphery of the lower surface of the lower head member 51, and a groove serving as the lower flame port 6L is formed in the lower annular wall 54. Many are formed at intervals in the circumferential direction. The lower ends of these grooves are closed by the upper end portion of the outer cylindrical body 41, so that a lower flame port 6 </ b> L is defined between the burner body 4 and the lower head member 51.

  The burner 3 further includes a first mixing pipe 7U for the upper flame port 6U that communicates with a space between the intermediate cylinder 42 and the inner cylinder 43 of the burner body 4, and an outer cylinder 41 that is intermediate between the outer cylinder 41 and the burner body 4. And a second mixing tube 7L for the lower flame port 6L communicating with the space between the cylindrical body 42. The first and second nozzles 8U, 8L arranged facing the upstream ends of the first and second mixing tubes 7U, 7L are mixed with the fuel gas and the primary air, respectively. 7L is mixed, and the air-fuel mixture from each mixing pipe 7U, 7L is supplied to each corresponding flame opening 6U, 6L. In other words, the air-fuel mixture from the first mixing pipe 7U passes through the space between the intermediate cylinder 42 and the inner cylinder 43 of the burner body 4 and the space between the lower head member 51 and the upper head member 52 through the upper flame. The air-fuel mixture supplied from the second mixing pipe 7L passes through the space between the outer cylinder 41 and the intermediate cylinder 42 of the burner body 4 and the space between the outer cylinder 41 and the lower head member 51. To the lower flame outlet 6L.

  In this way, since the air-fuel mixture is supplied to the upper and lower flame ports 6U and 6L from the different mixing pipes 7U and 7L through different paths, the upper and lower flame ports 6U and 6L are burned. When the combustion is performed only from the high flame state to the lower stage flame outlet 6L, it is possible to adjust the heating power over a wide range from the hot flame state.

  The outer cylinder 41 of the burner body 4 is provided with a skirt portion 41a extending downward from the outer periphery of the upper end portion. And the cover ring 9 which covers the burner opening 2a of the top plate 2 is extrapolated to the skirt portion 41a so that the infiltration of the spilled juice from the burner opening 2a can be prevented by the cover ring 9.

  The burner 3 includes an ignition plug 10 that ignites the ignition flame port 6I, and a thermocouple that detects the flame of the lower flame port 6L at a position opposite to the circumferential direction of the burner head 5 from the position where the ignition plug 10 is disposed. The flame detection element 11 which consists of is attached. The burner 3 is further provided with a pan bottom temperature sensor 12 that is positioned in the inner circumferential space of the burner surrounded by the burner head 5 and detects the temperature of the cooking container.

  By the way, the burner 3 of this embodiment differs from the stove burner in which the burner head 5 is composed of a single member, so that the burner head 5 is composed of two members, the lower head member 51 and the upper head member 52. After cleaning the burner 3, there is a possibility that only the lower head member 51 is installed on the burner body 4 and the upper head member 52 is forgotten to be installed. Even when the upper head member 52 is forgotten to be installed, if the ignition flame port 6I is ignited, the flame detection element 11 detects the flame by the fire transfer to the lower flame port 6L, and an electromagnetic safety valve not shown in the figure. Is kept open, and fuel gas continues to be ejected from the first and second nozzles 8U, 8L. Then, it is transferred to the air-fuel mixture for the upper flame port 6U that is not regulated by the upper head member 52 and is illegally discharged upward, causing backfire and poor combustion.

  Therefore, in the present embodiment, the lower head member 51 is provided with the target portion 55 facing the ignition plug 10, and the ignition flame port 6I is opened to the peripheral surface portion of the lower head member 51 below the target portion 55, In addition, it is provided so as to communicate with the space between the lower head member 51 and the upper head member 52 so that a part of the air-fuel mixture for the upper flame port 6U flowing into the space flows into the ignition flame port 6I. Yes.

  Here, in the state where the upper head member 52 is forgotten to be installed, the air-fuel mixture for the upper flame port 6U is released upward without being restricted by the upper head member 52, and therefore the upper flame port 6U is directed to the ignition flame port 6I. Thus, the air-fuel mixture is no longer supplied, and the ignition flame port 6I cannot be ignited. Therefore, the flame detector 11 detects the flame by ignition in the state where the upper head member 52 is forgotten to be installed, and the fuel flame continues to be ejected from the nozzles 8U and 8L, and the upper flame outlet is discharged irregularly upward. It is possible to prevent backfire and poor combustion due to the transfer of gas to the 6U mixture. Hereinafter, the ignition flame port 6I will be described in more detail.

  In the present embodiment, a hole is formed in the upper annular wall 53 of the lower head member 51 so as to open to the lower peripheral surface portion of the target portion 55 projecting from the upper annular wall 53, and the ignition flame port 6I is formed by this hole. ing. Here, the ignition flame opening 6 </ b> I is formed to be inclined downward toward the peripheral surface of the first head member 51, that is, the peripheral surface of the upper annular wall 53.

  Further, a portion 53a of the upper annular wall 53 serving as a communication portion of the ignition flame port 6I with respect to the space between the lower head member 51 and the upper head member 52 is formed on the upper annular wall 53 forming a groove serving as the upper flame port 6U. It extends radially inward from the part. An inflow groove 6Ia is formed in the portion 53a of the upper annular wall 53 as shown in FIGS. 1 and 3, so that the air-fuel mixture for the upper stage nozzle 6I flows into the ignition flame port 6I through the inflow groove 6Ia. I have to. The groove width of the inflow groove 6Ia is smaller than the hole diameter of the upper flame port 6I. For example, the hole diameter of the upper flame port 6I is 4 mm, whereas the groove width of the inflow groove 6Ia is 1.2 mm.

  The air-fuel mixture does not flow into the ignition flame port 6I inclined downward as in the present embodiment unless the upper head member 52 restricts the upward flow of the air-fuel mixture for the upper flame port 6I. Further, the radially inwardly extending portion 53a forming the inflow groove 6Ia of the upper annular wall 53 also restricts the inflow of the air-fuel mixture for the upper stage flame port 6U into the ignition flame port 6I. Therefore, ignition to the ignition flame port 6I in a state where the upper head member 52 is forgotten to be installed can be prevented more reliably.

  Further, when the ignition flame port 6U is formed by a hole drilled in the lower head member 51 as in the present embodiment, this hole communicates directly with the space between the lower head member 51 and the upper head member 52. In order to prevent backfire from the ignition flame port 6I to this space, the hole diameter of the ignition flame port 6I needs to be 2 mm or less. However, when the hole diameter is about 2 mm, water does not escape if the ignition flame port 6I is sealed with water by cleaning the lower head member 51. On the other hand, in the present embodiment, an inflow groove 6Ia having a groove width smaller than the diameter of the ignition flame port 6I is provided in the communication portion of the ignition flame port 6I with respect to the space between the lower head member 51 and the upper head member 52. Therefore, even if the hole diameter of the ignition flame port 6I is increased to about 4 mm so that water can easily escape, backflow can be prevented by the inflow groove 6Ia. Even if the groove width of the inflow groove 6Ia is narrow, the water in the groove can be easily blown off, and there is no problem.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above embodiment, the air-fuel mixture is supplied from the separate mixing tubes 7U and 7L to the upper flame hole 6U and the lower flame hole 6L, but the upper flame hole 6U and the lower flame are supplied from one common mixing tube. It is also possible to supply air-fuel mixture to the holes 6L. Further, in the above embodiment, the upper annular wall 53 erected on the outer peripheral portion of the upper surface of the lower head member 51 is formed with the groove that becomes the upper flame port 6U, the target portion 55, and the hole that becomes the ignition flame port 6I. It is also possible to suspend an annular wall that forms a groove to become the flame opening 6U on the outer peripheral portion of the lower surface of the upper head member 52. In this case, a notch is formed in a portion of the annular wall that coincides with the arrangement portion of the spark plug 10, and a protrusion is provided on the upper surface of the lower head member 51 so as to fit in the notch. The target portion 55 and the ignition flame port 6I may be formed.

  It is also possible to provide the upper head member 52 with a target portion that faces the spark plug 10. However, in this case, if the upper head member 52 is forgotten to be installed, an irregular spark discharge is performed between the spark plug 10 and the lower head member 51, and the lower flame outlet 6L may be ignited. There is sex. Here, when the second target portion is provided in the vicinity of the ignition flame port 6I away from the lower flame port 6L of the lower head member 51 and the upper head member 52 is forgotten to be installed, the ignition plug 10 and the second If spark discharge is performed between the target portion and the lower flame outlet 6L, it is possible to prevent ignition to some extent. However, in a state where the upper head member 52 is installed, the spark discharge is surely performed not between the second target portion and the spark plug 10 but between the target portion provided on the upper head member 52 and the spark plug 10. Is performed, the distance (discharge gap) between the second target portion and the spark plug 10 is at least twice the discharge gap between the target portion provided on the upper head member and the spark plug 10. Must be set to Therefore, when the upper head member 52 is forgotten to be installed, a spark discharge is performed not between the spark plug 10 and the second target part, but between the spark plug 10 and the vicinity of the lower stage flame opening 6L, There is a possibility that the lower flame outlet 6L will be ignited.

  On the other hand, if the target portion 55 is provided on the lower head member 51 as in the above embodiment, even if the upper head member 52 is forgotten to be installed, a spark discharge is generated only between the target portion 55 and the spark plug 10. Therefore, it is possible to reliably prevent the lower flame outlet 6L from being ignited by an irregular spark discharge, which is advantageous.

Sectional drawing of the burner of embodiment of this invention. The perspective view of the burner of embodiment. The top view of the principal part of the lower head member of the burner of embodiment.

Explanation of symbols

  3 ... Burner for stove, 4 ... Burner body, 5 ... Burner head, 51 ... Lower head member, 52 ... Upper head member, 55 ... Target part, 6U ... Upper flame outlet, 6L ... Lower flame outlet, 6I ... Ignition flame outlet , 6Ia ... inflow groove, 10 ... spark plug.

Claims (4)

A burner for a stove having a two-stage upper and lower flame opening provided on a circumferential surface of a burner head provided on the burner body and an ignition flame opening ignited by a spark plug, the burner head being disposed between the burner body and the burner head In what consists of two members, a lower head member that defines a lower flame mouth, and an upper head member that defines an upper flame mouth between the lower head member,
A target portion facing the spark plug is provided on one of the lower head member and the upper head member,
The ignition flame opening is provided in the peripheral surface portion of the lower head member on the lower side of the target portion, and is provided so as to communicate with the space between the lower head member and the upper head member, and the upper flame flowing in the space A stove burner characterized in that a part of the air-fuel mixture for the mouth flows into the ignition flame mouth.   The stove burner according to claim 1, wherein the target portion is provided on the lower head member.   The stove burner according to claim 1 or 2, wherein the ignition flame port is formed so as to be inclined downward toward a peripheral surface of the lower head member.   The ignition flame port is formed by a hole perforated in the lower head member, and an inflow with a groove width smaller than the diameter of the ignition flame port is formed in a communication portion of the ignition flame port with respect to a space between the lower head member and the upper head member. The stove burner according to any one of claims 1 to 3, wherein a groove is provided, and the air-fuel mixture for the upper stage flame flows into the ignition flame port through the inflow groove.

Images