JP2019020042A - Combustor of heating cooker - Google Patents

Abstract

To provide a combustor of a heating cooker capable of heating a heat sensitive part (40a) of a thermocouple (40) stably, and capable of enhancing generating electromotive force output from the thermocouple (40) to open a gas shut-off valve quickly to prevent ignition delay at a main burner port (20).SOLUTION: A pilot burner (1) for spreading fire to a main burner port (20) is provided below a main burner (2). The pilot burner (1) has: a mixer tube (13) in which air-fuel mixture flows; a hollow burner body part (10) with which the mixer tube (13) communicates, and in which the air-fuel mixture flows upward; an ignition burner port (30) composed of a plurality of burner port groups each of which is opened to an upward side of the burner body part (10), wherein the burner port group is provided so as to approximate a spark part (3a) of an ignition electrode (3); and a pair of first and second burner ports (31), (32) adjacent to the ignition burner port (30) and provided with a fire spreading burner port (33) interposed therebetween. Between the first and second burner ports (31), (32), a heat sensitive part (40a) of a thermocouple (40) is positioned.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a combustion apparatus for a heating cooker, and more particularly to a gas combustion apparatus for heating a rice cooker of a gas rice cooker.

In a gas rice cooker as a heating cooker, a main burner having an annular burner head is disposed as a combustion device below the rice cooker, and is formed in a main flame hole that opens to the outer peripheral surface of the burner head. The bottom of the rice cooker is heated by the flame. In general, the main flame hole should not be ignited directly from the ignition pilot burner (hereinafter referred to as the ignition burner), and the flame formed in the ignition flame hole of the ignition burner is once used as a low-combustion seed pilot. By igniting a burner (hereinafter referred to as a seed fire burner) and using the flame formed in the seed fire burner as a seed fire, it is transferred to the main flame hole of the main burner, to all the main flame holes of the burner head. It is configured to ignite.
The ignition burner is ignited by an ignition electrode such as an igniter, and the combustion state (ignition or misfire) of the seed burner is detected by a thermocouple.
In the conventional combustion apparatus, when the thermosensitive part of the thermocouple is sufficiently heated by the flame formed in the seed burner and a generated electromotive force of a predetermined level or more is detected, the gas shut-off valve is opened, and the gas is supplied to the main burner. Is supplied and combustion starts in the main flame hole of the burner head.

JP-A-62-206324 JP-A-10-267229

  However, in the combustion apparatus configured as described above, the flame is difficult to stabilize because the seed flame burner is small as described above, and due to the installation error of the seed flame burner, the flame formed in the flame hole of the seed flame burner, It may be difficult to properly arrange the thermosensitive part of the thermocouple. In such a case, there is a problem that the thermocouple becomes insufficiently heated, the generated electromotive force is low, and it takes time to open the gas shut-off valve.

  The present invention has been made in view of the above problems, and can heat the thermosensitive part of the thermocouple in a stable state, and can quickly open the gas shut-off valve by increasing the generated electromotive force output from the thermocouple. It is an object of the present invention to provide a combustion apparatus for a heating cooker that can prevent a delay in ignition to the main flame hole.

The present invention taken to achieve the above object
Below the main burner is provided a seed fire burner for transferring to the main flame hole of the main burner,
The seed fire burner is
A mixing tube through which a mixture of fuel gas and primary combustion air flows;
A hollow burner body portion communicating with the downstream end of the mixing tube and through which the air-fuel mixture flows upward from the downstream end;
It consists of a plurality of flame hole groups each opening above the burner body part,
The flame hole group is:
An ignition flame hole provided close to the spark portion of the ignition electrode;
A pair of first and second flame holes provided adjacent to or through the ignition flame hole,
A heat sensitive part of a thermocouple is located between the first flame hole and the second flame hole.

The technical means operates as follows.
The pilot fire burner has a structure in which a hollow burner body part is communicated with the downstream end of the mixing pipe, and an air-fuel mixture composed of fuel gas and primary combustion air is sent from the mixing pipe into the burner body part. It flows toward each flame hole group that opens upward. In the flame hole group, the air-fuel mixture flowing into the ignition flame hole is ignited by the spark portion of the ignition electrode, and a flame is formed in the ignition flame hole. When the first and second flame holes are formed adjacent to the ignition flame hole, the flame of the ignition flame hole directly transfers to the first and second flame holes, or the ignition flame hole and the first flame hole. When a fire transfer flame hole is formed between the second flame hole, a flame is formed in the first and second flame holes via the fire transfer flame hole. Since the thermocouple is installed so that the heat sensitive part is positioned between the first and second flame holes, the heat sensitive part is sandwiched from both sides by two flames respectively formed in the first and second flame holes. Heated. Therefore, a flame can be reliably formed in the first and second flame holes as compared with the case where the ignition pilot burner is separately provided. Moreover, compared with the conventional one heated with one flame, the heating to the thermosensitive part of a thermocouple is stabilized, and the generated electromotive force can be made high.

In the combustion apparatus of the heating cooker, preferably,
The burner body part is constituted by a front plate having an inlet to which a mixing pipe is connected, and a rear plate connected to the front plate at a predetermined distance,
The maximum separation distance between the front plate and the rear plate on the flame hole group side with respect to the inflow port is set to be equal to or larger than the diameter of the inflow port.
The fuel gas flows through the mixing tube, and the primary combustion air is introduced from the middle thereof. When the distance between the front plate and the rear plate forming the burner body part is narrower than the diameter of the gas inlet, the fuel gas collides with the rear plate to prevent a smooth flow to the upper flame hole group, Primary air is difficult to be aspirated. Therefore, the maximum separation distance between the front plate and the rear plate on the flame hole group side relative to the inlet is relatively large, specifically, by setting it to be equal to or larger than the diameter of the inlet, Air can be smoothly taken into the mixing tube.

In the combustion apparatus of the heating cooker, preferably,
The main flame hole of the main burner is not formed above the flame hole group of the seed flame burner.
In this case, since the main flame hole of the main burner is not formed above the flame hole group opened above the burner body part of the seed flame burner, the flame hole group of the seed flame burner and the flame of the main burner are not formed. The holes do not overlap with each other, and inconveniences that interfere with each other can be prevented. For example, when a gas rice cooker is employed as the heating cooker and a gas burner is employed as the combustion device, a substantially uniform flame can be formed in the entire peripheral area of the annular burner head provided in the main burner. Thereby, the whole pot bottom of a rice cooking pot can be heated uniformly, and cooking with no unevenness is attained.

According to the present invention, heating to the heat sensitive part is stabilized and insufficient heating of the thermocouple is resolved, so that a high generated electromotive force can be quickly output from the thermocouple. As a result, the gas shut-off valve can be opened in a short time, and the main flame hole of the main burner can be quickly ignited. Therefore, it is possible to provide a combustion device for a heating cooker with high ignition accuracy. It becomes.
In addition, the structure in which the ignition burner and the seed burner are integrally provided simplifies the structure and requires only one mixing tube to be connected. Therefore, the number of parts is reduced and the cost is reduced. In addition to being able to achieve this, since the assembly is simplified, productivity can be improved.

It is explanatory drawing which shows an example of the combustion apparatus of the heating cooker which concerns on embodiment of this invention. It is a principal part enlarged view which shows an example of the combustion apparatus of the heating cooker which concerns on embodiment of this invention. It is a principal part expanded sectional view which shows an example of the combustion apparatus of the heating cooker which concerns on embodiment of this invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.
The cooking device according to the embodiment of the present invention is a gas rice cooker, and the combustion apparatus is a gas burner (200) in which an annular main burner (2) projects upward.
The gas rice cooker according to the embodiment of the present invention includes a lower case (41) that houses the gas burner (200) and a rice cooker that is placed on the lower case (41) and is not shown. It has an upper case.
The gas burner (200) includes a mixing pipe (23) having one end opened to face the gas injection nozzle of the gas supply device (4), and an annular burner body (21) having the other end communicating with the mixing pipe (23). The main burner (2) is composed of a burner head (22) mounted thereon.

On the outer peripheral surface of the burner head (22), a plurality of slit-shaped main flame holes (20) that open to the outside and communicate with the burner body (21) are opened, and the mixing tube (23) is opened. The air-fuel mixture sent from the end into the burner body (21) is ejected to the outer peripheral side of the burner head (22) through the main flame hole (20).
The main flame hole (20) of the main burner (2) is ignited by transferring the flame formed in the seed flame burner (1).

As shown in FIG. 2 and FIG. 3, the pilot flame burner (1) is a horizontally long front having a substantially rectangular shape in which the downstream end of the mixing pipe (13) is connected to the inlet (11a) provided in the substantially central portion. From the plate (11) and the rear plate (12) that is crimped to the back side thereof with a predetermined interval, a hollow oblong burner body portion (10) that is flat in the front-rear direction is formed, A cover plate (14) is attached so as to cover the burner body portion (10) from above. A window portion (14a) is open at the top of the cover plate (14), and from this window portion (14a), a flame hole group (30) to (33) provided at the upper end portion of the burner body portion (10). Is exposed.
Further, the ignition electrode (3) and the thermocouple (40) are attached to the front plate (11) so as to be positioned on both sides of the mixing tube (13).

The flame hole group (30) to (33) exposed from the window (14a) includes an ignition flame hole (30) provided in the vicinity of the spark part (3a) of the ignition electrode (3), and an ignition flame hole (30 ) And above the mixing pipe (13), and on both sides of the heat sensitive part (40a) of the thermocouple (40), adjacent to the flame transfer hole (33). It consists of first and second flame holes (31) and (32) that are open as shown.
Also, the mixing pipe (13) has two air intake holes (13a) through which external air (fresh air) serves as the primary combustion air from the mixing pipe (13). Is mixed with the fuel gas flowing into the mixing pipe (13), and a combustion air-fuel mixture is generated in the burner body (10).

In addition, as shown in FIG. 3, the flame hole group (30) rather than the inflow port (11a) so that the combustion primary air can be smoothly taken into the (13) from the air intake hole (13a). It is desirable that the maximum separation distance (L1) between the front plate (11) and the rear plate (12) on the (33) side is set to at least the diameter (L2) of the inflow port (11a).
According to the applicant's examination, the maximum separation distance (L1) between the front plate (11) and the rear plate (12) on the flame hole group (30) to (33) side from the inlet (11a) is the flow rate. When the diameter (L2) of the inlet (11a) is about 10% narrower, the pressure loss of the mixed gas from the mixing pipe (13) will be about 2% larger than when both are the same size. Has been confirmed.

The mixture of the fuel gas flowing through the mixing tube (13) and the primary combustion air is sent into the burner body (10) and then rises toward the upper flame hole groups (30) to (33). I will do it.
When the spark part (3a) of the ignition electrode (3) is spark ignited, a flame is formed in the ignition flame hole (30) located close to the spark part (3a), and this flame is ignited by the ignition flame hole (30). The first and second flame holes (31) and (32) are transferred to the first flame hole (31) and further to the second flame hole (32) through the flame transfer hole (33) adjacent to the first flame hole (33). A flame is formed. Since the heat sensitive part (40a) of the thermocouple (40) is positioned between the first and second flame holes (31) and (32), the heat sensitive part (40a) is provided with the first and second flames. Heated from both sides by two flames formed in the holes (31) and (32), reliable and stable heating can be obtained. As a result, the generated electromotive force is increased and the gas shut-off valve in the gas supply device (4) can be opened in a short time, so that the air-fuel mixture quickly flows to the burner body (21) of the gas burner (200). The main flame hole (20) of the main burner (2) can be transferred from the seed burner (1) and ignited quickly over the entire circumference.

  Note that projecting pieces (12a) and (12b) projecting upward from the ignition flame hole (30) and the flame transfer flame hole (33) are provided on a part of the upper end portion of the rear plate (12). The projecting piece (12a) protruding above the ignition flame hole (30) causes the air-fuel mixture ejected from the ignition flame hole (30) to flow toward the spark portion (3a) of the ignition electrode (3). The projecting piece (12b) that functions as a guide plate for facilitating ignition and protrudes above the fire transfer flame hole (33) is sent from the burner body part (10) to the fire transfer flame hole (33). It functions as a flow dividing plate for diverting the incoming air-fuel mixture to both the ignition flame hole (30) side and the first flame hole (31) side.

  Further, as shown in FIG. 3, a collar portion (15) is projected forward from the upper end of the cover plate (14), and a horizontally long slot (15a) penetrates the collar portion (15). Is formed. On the other hand, a substantially L-shaped insertion piece (25) protrudes from a predetermined position of the burner body (21) of the gas burner (200). Set the pilot flame burner (1) at a predetermined location on the burner body (21) of the gas burner (200), and insert the burner (25) into the slot (15a) of the flange (15). By installing the head (22) on the upper surface of the burner body (21), the burner head (22) and the seed fire burner (1) are set in a positioned state.

  In this positioning state, as shown in FIG. 2, the main flame hole (20) of the main burner (2) is not formed above the flame hole groups (30) to (33). Thus, the flame formed in each of the flame hole groups (30) to (33) and the flame ejected from the main flame hole (20) do not overlap. In other words, the flame formed in the flame hole groups (30) to (33) and the flame formed in the main flame hole (20) do not interfere with each other, so that the entire outer surface of the burner head (22) It is possible to form an almost uniform flame. Therefore, since the whole bottom of the rice cooker can be heated evenly, a gas rice cooker capable of cooking with no unevenness can be provided.

  Further, a portion corresponding to the upper part of the flame hole group (30) to (33) of the igniter burner (1) is projected from the outer peripheral edge of the burner head (22) to form the cover part (24). ing. Thereby, since the upper part of the flame hole group (30) to (33) is protected by the cover part (24), inconvenience that water, broth, etc. enter the flame hole group (30) to (33) is prevented. I can do it.

  As described above, in the combustion apparatus according to the embodiment of the present invention, the thermosensitive part (40a) of the thermocouple (40) is sandwiched between the two flames formed in the first and second flame holes (31) and (32). Therefore, even if the fuel gas sent to the seed burner (1) has a low combustion amount, the heat sensitive part (40a) is reliably heated in a stable state, and the thermocouple (40 ) Does not become insufficiently heated, and a high generated electromotive force can be output quickly. As a result, the gas shutoff valve of the gas supply device (4) is opened in a short time, and the main flame hole (20) of the main burner (2) can be quickly ignited.

  Further, one kind of flame burner (1) is connected to the ignition flame hole (30), the flame transfer flame hole (33), and the first and second flame holes (31) and (32) for the thermocouple (40). Is provided with a single burner body part (10) provided with a single mixing pipe (13) that feeds the air-fuel mixture into the burner body part (10). In addition to cost reduction, the simplified structure facilitates assembly and improves productivity.

In the above embodiment, the front electrode (11) of the pilot burner (1) is configured such that the ignition electrode (3) and the thermocouple (40) are respectively located on both sides of the mixing tube (13). However, the mixing tube (13), the ignition electrode (3), and the thermocouple (40) may be provided in this order. In this case, the first flame hole (31) and the second flame hole (32) may be provided adjacent to the ignition flame hole (30), and the fire transfer flame hole (33) is not necessarily provided.
In addition, in the said embodiment, although the seed flame burner (1) was employ | adopted as a combustion apparatus of a gas rice cooker, it is also possible to employ | adopt as another heating cooker.

(1) ・ ・ ・ ・ ・ ・ ・ ・ ・ Burning burner
(10) ... Burner body
(13) ... Mixing tube
(2) ・ ・ ・ ・ ・ ・ ・ ・ ・ Main burner
(20) ・ ・ ・ ・ ・ ・ ・ ・ ・ Main flame hole
(21) ... Burner head
(3) ・ ・ ・ ・ ・ ・ ・ ・ ・ Ignition electrode
(3a) ..... Spark Department
(30) ... Ignition flame hole
(31) (32) ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ First and second flame holes
(33) ...
(40) ..... Thermocouple
(40a) ・ ・ ・ ・ ・ ・ ・ ・ Heat sensitive part

Claims (3)

Below the main burner is provided a seed fire burner for transferring to the main flame hole of the main burner,
The seed fire burner is
A mixing tube through which a mixture of fuel gas and primary combustion air flows;
A hollow burner body portion communicating with the downstream end of the mixing tube and through which the air-fuel mixture flows upward from the downstream end;
It consists of a plurality of flame hole groups each opening above the burner body part,
The flame hole group is:
An ignition flame hole provided close to the spark portion of the ignition electrode;
A pair of first and second flame holes provided adjacent to or through the ignition flame hole,
A combustion apparatus for a heating cooker, wherein a thermosensitive portion of a thermocouple is positioned between the first flame hole and the second flame hole. The combustion apparatus for a heating cooker according to claim 1,
The burner body part is constituted by a front plate having an inlet to which a mixing pipe is connected, and a rear plate connected to the front plate at a predetermined distance,
A combustion apparatus for a heating cooker, wherein a maximum separation distance between a front plate and a rear plate on the flame hole group side from the inlet is set to be equal to or larger than a diameter of the inlet. In the combustion apparatus of the heating cooker according to claim 1 or 2,
A combustion apparatus for a heating cooker configured such that the main flame hole of the main burner is not formed above the flame hole group of the seed flame burner.

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