JP2019105392A - Burner for cooking stove - Google Patents

Abstract

To provide a burner for a cooking stove capable of preventing back fire without damaging the appearance of a gas cooking stove and further capable of preventing clogging caused by boil over.SOLUTION: Provided is a burner for a cooking stove comprising: a burner body 3 connected to a mixing tube feeding a gaseous mixture; and a burner head 30 arranged on the burner body 3 and having annular walls 11, 21 in which many burner ports 10a, 20 are formed in a circumferential direction, in which porous cylindrical filters 4 through which the gaseous mixture can pass and also flame is shielded are arranged in such a manner that its annular circumferential wall part 40 runs along the inner circumferential faces of the annular walls 11, 21 of the burner head 30.SELECTED DRAWING: Figure 2

Description

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

  Generally, a stove burner has a mixing tube for supplying a mixed gas of fuel gas and primary air, a burner body connected to the mixing tube, and a burner head set on the burner body. A large number of flame holes are circumferentially formed in the annular wall. The mixed gas ejected from the flame holes from the mixing tube through the burner body is ignited by a spark plug provided in the vicinity of the outside of the flame holes, and a flame is formed obliquely outward in each flame hole. .

In this type of stove burner, when the diameter of the burner head is reduced, the number of flame holes formed in the annular wall of the burner head is reduced. Although it is necessary to expand the area of the flame holes in order to obtain strong thermal power with less flame holes, when the area of the flame holes is expanded, the gas pressure (flow velocity) of the gas mixture in the flame holes decreases. At the time of burning with low heat, flashback is likely to occur. This is because when the flow velocity of the mixed gas in the flame hole is low, if the heat power is reduced to low heat, the burning speed exceeds the ejection velocity of the mixed gas ejected from the flame hole to the outside, and the flame Without being held in the holes, the phenomenon (backfire phenomenon) may occur which sinks into the burner head and flows back to the mixing tube.
In order to prevent such a flashback, there is a configuration in which the wire is wound at a predetermined pitch in the vertical direction in the flame hole forming area of the annular wall of the burner head (see Patent Document 1). In this case, by making the pitch between the wires equal to or less than the quenching distance, it is possible to prevent the flame formed in the flame holes from invading the burner head from the gap between the wires and the flashback in the mixing tube. The occurrence can be prevented.

JP, 2009-228938, A

  However, in the above-mentioned conventional apparatus, since the wire rod is wound around the burner head, the appearance of the gas stove is impaired, and there is a problem that the wire rod is easily clogged by boiling.

  An object of the present invention is to provide a burner for a stove, which can prevent flashback without damaging the appearance of the gas stove and can prevent clogging due to boiling over, in view of the above points.

In order to solve the above problems, according to the present invention, there is provided a burner body connected to a mixing tube for supplying a mixed gas of fuel gas and primary air, and a plurality of flame holes disposed on the burner body and circumferentially And a burner head comprising a burner head having a formed annular wall,
A porous tubular filter is provided, through which the mixed gas can pass and which shields the flame.
The filter is characterized in that the annular peripheral wall portion is disposed along the inner peripheral surface of the annular wall of the burner head.

The above technical means work as follows.
The mixed gas sent from the mixing tube is sent to each burner and ignited after passing through the holes of the porous filter. If the flow velocity of the mixed gas decreases and the flame tries to penetrate from the flame hole to the inner side of the burner head, the annular peripheral wall portion of the filter is disposed along the inner peripheral surface of the annular wall of the burner head. Therefore, the flame directed inward from the flame hole is shielded by the annular peripheral wall portion of the filter, and does not penetrate further inward than the filter. Therefore, it is possible to prevent the problem of flashback in the mixing tube.
Since this filter is provided along the inner peripheral surface of the annular wall of the burner head, it can not be seen from the outside of the stove burner, and its appearance will not be impaired. As it is only necessary to set in position, assembly is easy.
In addition, since nothing is provided in the fire hole, the fire hole is not easily clogged by boiling.

In the stove burner, preferably, the filter is set such that all the fire holes can be projected in the lateral direction.
Since the filter is located in the area where the flame holes are projected in the lateral direction, it is possible to reliably block the flame entering the burner head from the flame holes. Thus, it is possible to reliably prevent flashback.

In the above stove burner, desirably, the filter is configured such that the annular peripheral wall is higher than the projection range in the lateral direction of the flame hole, and the annular ceiling is directed inward from the upper end of the annular peripheral wall The wall is extended.
The flame which is going to get into the burner head from the flame hole is shielded by the annular peripheral wall of the filter.
In addition, when boiling spills in the burner head from the flame, the spillage adheres to the projection area of the flame vent in the annular peripheral wall portion of the filter and the lower area thereof, and clogging of the filter occurs. Even if there is, there is no sticking of boiling over to the area above the projection range and the annular top wall. In this way, boiling does not clog the entire area of the filter. In addition, since the filter has a large area secured by the inwardly directed annular top wall portion, the mixed gas can be reliably sent to the flame holes through the annular top wall portion. Therefore, it is possible to prevent the ignition failure and the combustion failure due to the clogging of the filter.

Preferably, in the stove burner, the filter is formed of a material having high thermal conductivity, and at least one of the upper and lower ends of the filter is in surface contact with a predetermined position of the burner head. is there.
In this case, when the burner head becomes hot due to heating at the time of ignition, the temperature of the filter also rises rapidly. By heating the filter, it is possible to volatilize oil and water in the boiled spill adhering to the filter, so that clogging of the filter due to the boiled spill can be suppressed.

In the above stove burner, desirably, a large number of main flame holes and sub flame holes are formed in upper and lower two stages in the annular wall of the burner head, and a small combustion state in which mixed gas is supplied only to the sub flame holes. And can be switched to the large combustion state where the mixed gas is supplied to both the main and sub flame holes,
An annular base portion extends inward from a boundary portion between the main flame hole and the auxiliary flame hole on the inner peripheral surface of the annular wall, and an annular top plate portion extends inwardly from the upper end of the annular wall. ,
The filter has an annular lower flange portion mounted on the annular pedestal portion and an annular upper flange portion contacting the annular top plate portion.
When the lower flange of the filter is placed in surface contact with the annular pedestal projecting inwardly from the annular wall of the burner head, the upper flange of the filter is placed on the lower surface of the annular top plate of the burner head. It becomes an aspect which makes a surface contact.
In the above installation mode of the filter, the annular peripheral wall portion of the filter corresponds to the main flame hole, and in the large combustion state, when it becomes difficult to hold the flame outside the main flame hole, the main flame hole Can block the flame that is going to get into the burner head.
Further, since the upper and lower flanges of the filter are disposed in surface contact with the annular top plate and the annular pedestal constituting the burner head, the filter should be made of a material having high thermal conductivity. With ignition, the temperature of the filter can be raised promptly with the temperature rise of the burner head. This makes it possible to volatilize boiling and the like adhering to the filter and prevent clogging of the filter.
In addition, the presence or absence of the flame formed in the sub flame hole can be detected by providing flame detection means, such as a thermocouple, in the vicinity of the sub flame hole.

The present invention has the following unique effects because of the above-mentioned configuration.
By providing a porous cylindrical filter so that the annular peripheral wall extends along the inner circumferential surface of the annular wall of the burner head, it is possible to prevent flashback and the appearance of the stove burner is not impaired. In addition, since the cylindrical filter is merely placed at a predetermined position of the burner head, the filter can be easily assembled. In addition, by providing a portion to which the filter does not adhere to boiling, mixed gas can be reliably sent to the flame hole even if boiling occurs, and ignition failure due to clogging of the filter can be prevented. be able to.
As described above, according to the present invention, since the reverse fire can be reliably prevented and the safety can be ensured, the flame detection means such as a thermocouple can be optionally provided, and clogging due to boiling can also be prevented. . Therefore, it is possible to provide a safe, easy-to-use, and inexpensive stove burner.

It is a perspective view of a burner for stoves concerning an embodiment of the invention. It is a principal part enlarged section perspective view of a burner for stoves concerning an embodiment of the invention. It is a principal part expanded sectional view of a burner for stoves concerning an embodiment of the invention. It is a perspective view of a filter adopted as a burner for stoves concerning an embodiment of the invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The stove burner according to the embodiment is a parent-child burner provided with a main burner portion (100) and a sub-burner portion (200) located below the main burner portion (100), as shown in FIG. 1 and FIG. And two mixing tubes of a main mixing tube (301) for the main burner portion (100) and a sub mixing tube (302) for the sub burner portion (200) are extended from one burner body (3) ing.
The burner body (3) is formed into an inner and outer three-tiered structure from an outer cylindrical body (31), an intermediate cylindrical body (32), and an inner cylindrical body (33), and is formed on the outer cylindrical body (31). The lower head member (1) further has an upper head member (2) mounted thereon.
In this embodiment, the lower head member (1) and the upper head member (2) constitute a burner head (30).
The upper head member (2) may be referred to as a burner cap.
Further, the lower head member (1) and the upper head member (2) may be integrally formed, or may be integrally fixed by caulking or the like.

  The lower head member (1) has a lower annular wall (11) seated on the upper end of the outer cylinder (31) and an annular pedestal (12) projecting inward from the lower end of the lower annular wall (11) And an annular depending wall (13) depending from the inner end edge of the annular pedestal (12) and fitted into the upper open part of the intermediate cylinder (32), above the annular pedestal (12) A large number of upper flame holes (10a) are formed in the lower annular wall (11) located in the circumferential direction, and it is below the annular pedestal (12) and with the upper end of the outer cylinder (31). A plurality of lower flame holes (10b) are formed between them.

  The upper head member (2) placed above the lower head member (1) extends inward from the upper end of the upper annular wall and the upper annular wall (21) seated on the upper end of the lower annular wall (11) It comprises an annular top plate portion (22) to be provided and an annular depending wall (23) depending from the inner end edge of the annular top plate portion (22) and internally fitted to the upper open portion of the inner cylindrical body (33). The upper annular wall (21) is formed with a large number of flame holes (20).

In this embodiment, the stove burner comprises a main flame hole by the flame hole (20) and the upper flame hole (10a), and a parent-child burner forming the sub flame hole by the lower flame hole (10b) It has become.
The middle cylinder (32), the inner cylinder (33), the inner wall of the lower annular wall (11) of the lower head member (1), and the upper head member (2) continue to the main mixing tube (301). The main burner portion (100) is constituted, and the outer cylinder (31), the intermediate cylinder (32) and the outer wall of the annular hanging wall (13) of the lower head member (1) follow the submixing pipe (302) The secondary burner portion (200) is configured.
In addition, mixed gas is supplied from the main and sub mixing tubes (301) and (302) to the main and sub burner parts (100) and (200), and then to the flame holes (20) and the upper and lower flame holes (10a) and (10b). The large combustion state in which the flame is formed, and the small combustion state in which the mixed gas is supplied from the sub mixing tube (302) only to the sub burner portion (200) and the flame is formed only in the lower flame hole (10b) Switchable.

  As shown in FIG. 3, the main flame formed by the flame hole (20) and the upper flame hole (10a) is formed in a slit shape elongated in the vertical direction, and has a lower annular wall (11) and an outer cylinder A lower flame hole (10b) to be an auxiliary flame hole is formed between the upper end of the body (31). Each of the flame holes (20) (10a) (10b) is formed by an inclined hole which rises outward, and the flames formed in the flame holes (20) (10a) (10b) are directed obliquely upward. It becomes the aspect which spouts.

And in the burner for stoves of the embodiment, a porous substantially cylindrical tube made of a metal mesh as shown in FIG. 4 in the burner head (30) composed of the lower head member (1) and the upper head member (2) Install the filter (4) of
The filter (4) is formed of a net-like sheet obtained by knitting a thin metal wire having a high thermal conductivity so as to form a mesh smaller than about 2 mm square, and has an annular peripheral wall (40 ), An annular top wall (41) extending obliquely upward from the upper end of the annular peripheral wall (40), and horizontally from the upper edge of the annular top wall (41) As shown in FIGS. 2 and 3, it comprises: an annular upper flange portion (42) extended; and a lower flange portion (43) projecting from the lower end of the annular peripheral wall portion (40) to both inside and outside, The lower flange portion (43) is placed on an annular pedestal portion (12) provided on the lower head member (1).
Since the filter (4) can secure a wider area by the provision of the annular top wall (41) as compared with the tubular one having only the annular peripheral wall (40), the flame hole (20) (10a) It is possible to secure a sufficient amount of mixed gas supplied to the

When the upper head member (2) is set above the lower head member (1) after the filter (4) is placed on the annular pedestal (12) as described above, the annular peripheral wall (40) It is located along the inner surface of the lower annular wall (11) of the lower head member (1) and the upper annular wall (21) of the upper head member (2), and the annular top plate portion (22) of the upper head member (2) The dimensions of each portion are set such that the upper surface of the upper flange portion (42) of the filter (4) abuts on the lower surface of the filter.
The flame holes (20) of the upper head member (2) and the upper flame holes (10a) of the lower head member (1) rise outward as described above, in other words, inward. Since the flame holes (20) and the upper flame holes (10a) are projected into the burner head (30) along the inclination direction, these flame holes (20) (10a) ) Can be projected onto the annular peripheral wall portion (40) of the filter (4), and in the filter (4) of this embodiment, the annular peripheral wall portion (40) is higher than the projection range. It shall be formed.

When the filter (4) is placed in the burner head (30) in the above manner, the space in the burner head (30) is separated inside and outside the filter (4). The size of the mesh of the reticulated sheet being configured should be set to a size (for example, as described above, less than about 2 mm square) at which the extinction distance is the maximum clearance distance at which the flame extinguishes. Thus, the flame prevents flame propagation into the filter (4) by the mesh, and the flame is blocked by the filter (4). Since the mixed gas can pass through the mesh, the mixture flowing from the main mixing tube (301) between the inner cylindrical body (33) and the annular drooping portion (13) of the main burner portion (100) The gas passes through the filter (4) and is sent to the flame holes (20) of the upper head member (2) and the upper flame holes (10a) of the lower head member (1), and the outer periphery of the burner head (30) It can form a flame on the surface.
In addition, since the filter (4) is provided in the burner head (30), it does not cause heat shrinkage to the flame holes (20) and (10a), and the combustion becomes unstable even in a low heat condition at the initial stage of ignition I have nothing to do.

  And, for example, the upper head member (2) or the lower head member (1) of the burner head (30) is ignited in the state of being incorrectly set, or the flame hole (20) or the upper flame hole (10a) during cooking. When the firepower is squeezed in a state where it is difficult for the flame to form outside the flame hole (20) or the upper flame hole (10a) due to the blockage by simmering or the wind hits, the flow velocity of the mixed gas It may decrease, and flame holding may be difficult on the outside of the upper and lower head members (2) and (1). In such a case, the flame tries to penetrate into the burner head (30) from the flame hole (20) or the upper flame hole (10a), but the projection range of the flame hole (20) and the upper flame hole (10a) The flame is reliably cut off by the annular peripheral wall portion (40) of the filter (4) and the annular top wall portion (41) above it. Therefore, the flame does not flow into the burner body (3) beyond the filter (4), and there is no disadvantage that backfire occurs in the main mixing tube (301).

  In addition, as shown by the arrows in FIG. 3, when the boil spills infiltrate into the burner head (30) from the flame hole (20) and the upper flame hole (10a), the flame hole (20) and the upper flame hole (10a) ) May be attached to the projection range of the flame hole (20) and the upper flame hole (10a) in the annular peripheral wall portion (40) and its lower area, but the projection in the annular peripheral wall portion (40) It does not adhere to the area above the range or to the annular top wall (41). Therefore, even if boilout occurs, clogging does not occur in the entire area of (4), so the mixed gas passes through the upper region of the annular top wall portion (41) and the annular top wall portion (41). The mixed gas of a predetermined flow rate can be reliably fed continuously to the flame holes (20) and the upper flame holes (10a), and there is no inconvenience of causing the ignition failure.

The filter (4) is formed of a material having high thermal conductivity, and the lower flange portion (43) at the lower end thereof forms the annular pedestal portion of the lower head member (1) constituting the burner head (30) (12) Since the upper flange portion (42) at the upper end is placed in contact with the lower surface of the annular top plate portion (22) of the upper head member (2), the burner is placed at the time of ignition As the head (30) heats up, the temperature of the filter (4) also rises quickly. When the temperature of the filter (4) becomes high, oil and water in the boiling over adhering to the annular top wall (41) are volatilized, and clogging of the filter can be eliminated.
Since the filter (4) of this embodiment is only installed in the burner head (30), it is easy to assemble and is not exposed to the outside of the burner, so the appearance of the stove burner is There is no loss.

The filter (4) is for preventing flashback in the main burner portion (100), and in the vicinity of the flame hole (10b) of the sub burner portion (200), a thermocouple (a flame detecting element) Since the configuration is provided with a not shown), it can be detected by the thermocouple whether or not the flame is correctly formed from the flame holes (10b) of the secondary burner section (200).
That is, the filter (4) of the present embodiment can dispense with the installation of a flame detection element such as a thermocouple for the main burner portion (100), and is cheaper than providing two thermocouples.
The present invention is not limited to the parent-child burner, and may be a burner in which the flame holes are formed in one step.
Moreover, although the filter (4) of the said embodiment is comprised from the reticulated sheet, you may be made from punching metal.

(10a) ······ Upper flame hole (flame hole)
(11) · · · · · · Lower annular wall (annular wall)
(20) ..... Flame hole
(21) ······ Upper annular wall (annular wall)
(3) ..... Burner body
(30) ..... Burner head
(301) (302) ... mixing tube
(4) ..... filter
(40) ..... Annular peripheral wall

Claims (5)

A burner body connected to a mixing tube for supplying mixed gas of fuel gas and primary air, and a burner head provided on the burner body and having an annular wall in which a large number of flame holes are circumferentially formed. In the stove burner,
A porous tubular filter is provided, through which the mixed gas can pass and which shields the flame.
The said burner is a burner for stoves installed so that the annular peripheral wall part may be followed along the inner skin of the annular wall of a burner head. In the stove burner according to claim 1,
The above-mentioned filter is a stove burner for which all flame holes are set to be able to project laterally. In the stove burner according to claim 1 or 2,
The stove is configured such that the annular peripheral wall portion of the filter is higher than the projection range in the lateral direction of the flame hole, and the annular top wall portion extends inward from the upper end of the annular peripheral wall portion Burner. In the stove burner according to any one of claims 1 to 3,
The said filter is formed from the raw material with high heat conductivity, and the burner for stoves installed so that at least one of the upper and lower ends of a filter may be surface-contacted to the predetermined | prescribed place of a burner head. In the stove burner according to any one of claims 1 to 4,
In the annular wall of the burner head, a large number of main flame holes and sub flame holes are formed in upper and lower two stages, and a small combustion state in which mixed gas is supplied only to the auxiliary flame holes, and mixing in both main and sub flame holes It can be switched to the large combustion state that supplies gas,
An annular base portion extends inward from a boundary portion between the main flame hole and the auxiliary flame hole on the inner peripheral surface of the annular wall, and an annular top plate portion extends inwardly from the upper end of the annular wall. ,
The said burner is a burner for stoves which has an annular lower flange part mounted in the said annular base part, and an annular upper flange part which contacts the said annular top plate part.

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