JP3218500B2 - Burner cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner cap which is applied to a burner provided with a temperature sensor for detecting the temperature at the bottom of a pot.

[0002]

2. Description of the Related Art Conventionally, as a burner cap of this kind,
As shown in FIG. 4, an annular cap body b having a lower surface provided with teeth a for forming flame holes is provided, and a heat shield cylinder d for inserting a temperature sensor c, which is located above the cap body b, A clearance e is formed over the entire circumference between the upper surface of the cap body b and the lower end of the heat shield cylinder d, and the cap body b and the heat shield cylinder d are arranged in the circumferential direction extending between the inner peripheral surfaces of both the b and d. Multiple ribs f
Are known.

In this apparatus, since the radiant heat from the flame rising on the outer periphery of the burner is blocked by the heat shield cylinder d, the temperature at the bottom of the pot can be accurately detected by the temperature sensor c.
Secondary air can be supplied from the inside of the burner to the combustion portion on the outer periphery through the gap e.

[0004]

When a burner cap is manufactured, a cap body b and a heat shield are formed by using a molding die including a lower mold ML and an upper mold MU as shown in FIG. After the cylinder d and the rib f are integrally formed by forging, trimming is performed on the inner diameter side waste g and the outer diameter side waste h formed by the gap between the split surfaces of the lower mold ML and the upper mold MU. Next, a gap e is formed between the cap body b and the heat shield cylinder d by cutting the entire circumference so that only the rib f is left uncut.

Here, in the conventional burner cap, in order to reduce the material cost, the rib f is made long enough to reach the lower end of the inner peripheral surface of the heat shield cylinder d. In this case, if the split surface of the molding die inserted into the inner periphery of the burner cap is set above the upper end of the rib f, the lower die cannot be pulled down, so that the split surface is near the lower end of the rib f. Is set to However, in this case, the split surface is located below the heat shield cylinder d, and the inner peripheral surface of the heat shield cylinder d must be provided with a draft for pulling the upper mold upward, and the heat shield cylinder d The opening diameter of the upper end becomes large, so that boiled juice or the like easily enters from the upper end of the heat shield cylinder d. Further, the inner diameter of the burner cap becomes smaller at the trimming portion of the waste meat on the inner diameter side, and the flow of the secondary air toward the gap e is regulated by the trimming portion.

In view of the above, it is an object of the present invention to provide a burner cap in which the opening diameter at the upper end of the heat shield cylinder is as small as possible and the inside diameter below the gap can be increased.

[0007]

Means for Solving the Problems In order to solve the above problems,
In the present invention, a burner cap including an annular cap body having protruding teeth for forming flame holes on a lower surface thereof, and a heat shield cylinder located above the cap body, into which a temperature sensor for detecting the temperature of the bottom of the pot is inserted. A gap is formed over the entire circumference between the upper surface of the cap main body and the lower end of the heat shield cylinder, and a plurality of circumferential ribs extend between the cap main body and the heat shield cylinder between the inner peripheral surfaces thereof. In the connection, each rib was extended over the upper end of the inner peripheral surface of the heat shield cylinder, and a split surface was set on the inner peripheral surface of the heat shield cylinder at a portion matching the upper end of the heat shield cylinder. A draft is provided to pull out the lower mold of the molding die for the burner cap downward.

According to the present invention, even if the split surface of the mold is set at the upper end of the heat shield cylinder, the rib extends over the upper end of the heat shield cylinder. The upper end does not get caught,
The lower mold can be pulled down. The inner peripheral surface of the heat shield cylinder has a downward draft, that is, a taper whose diameter decreases upward, so that the opening diameter at the upper end of the heat shield cylinder is smaller than that of the above-described conventional example. be able to. Furthermore, by setting the split surface of the mold at the upper end of the heat shield cylinder, it is possible to form an inner flange portion projecting to the inner periphery at the upper end of the heat shield cylinder. The opening diameter at the upper end can be reduced as much as possible. Thus, it is possible to effectively prevent the infiltration of boiled-spilled juice and the like from the upper end of the heat shield cylinder, and to increase the inner diameter below the gap to smoothly flow the secondary air from below toward the gap. it can.

[0009] Since the heat shield cylinder is tapered upward to reduce the diameter, the amount of material of the heat shield cylinder is reduced.
Extending the ribs to reach the upper end of the heat shield tube does not increase the overall material cost of the burner cap.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a burner cap, and a burner cap 1 is placed on an annular burner body 2 to constitute a burner burner.

The burner cap 1 has an annular cap body 3 and a heat shield tube 4 located above the cap body 3. An inner cylindrical portion 3a extending downward is formed in the cap body 3, and a large number of teeth 3b are projected from the outer peripheral portion of the lower surface of the cap body 3 at intervals in the circumferential direction. The teeth 3b are seated on the upper surface of the burner body 2 in a state in which the teeth 3b are fitted to the inner periphery of the burner body 2, so that gas is ejected outward from a flame hole formed by a gap between the teeth 3b. ing.

A temperature sensor 5 which comes into contact with the bottom of the pot and detects the temperature thereof is urged upward by a spring (not shown) and inserted into the heat shield cylinder 4. When the pot bottom is overheated, the temperature sensor 5 is inserted. Fire extinguishes the burner burner at the signal from.

A gap 6 is formed over the entire circumference between the upper surface of the cap body 3 and the lower end of the heat shield cylinder 4. The gap 6 extends from the inner peripheral space of the stove burner to the outer combustion portion through the gap 6. So that secondary air is supplied. Cap body 3
The heat shield cylinder 4 and the heat shield cylinder 4 are connected via a rib 7 extending between the inner peripheral surfaces of the both 3 and 4, and the ribs 7 are arranged at a plurality of positions in the circumferential direction as shown in FIG. It is provided in the place.

When manufacturing the burner cap 1, FIG.
After the cap body 3, the heat shield cylinder 4, and the rib 7 are integrally formed by forging using a molding die composed of a lower mold 10 and an upper mold 11 as shown in FIG. Trimming the inner diameter side waste Din and the outer diameter side waste Dout formed by the gap of the split surface portion, and then cutting only the rib 7 between the cap body 3 and the heat shield cylinder 4 The gap 6 is formed by cutting the entire circumference so as to be left. The trimmed waste Din and Dout are melted and reused as a burner cap material.

Here, each rib 7 extends over the upper end of the inner peripheral surface of the heat shield cylinder 4, so that the core 10 a of the lower mold 10 inserted into the heat shield cylinder 4 and the upper Even if the split surface with the mold 11 is set to a portion that matches the upper end of the heat shield cylinder 4, the lower mold 1
0 can be pulled down without being disturbed by the ribs 7.
Therefore, in the present embodiment, the cut surface is set to a portion corresponding to the upper end of the heat shield cylinder 4, and the inner peripheral surface of the heat shield cylinder 4 is provided with a punch for removing the core 10 a of the lower mold 10 downward. It has a slope, that is, a taper whose diameter decreases upward.

Further, in the present embodiment, a small-diameter portion 10 having the same diameter as the circle inscribed in the three ribs 7 is provided at the upper end of the core portion 10a.
The inner flange portion 4a is formed at the upper end of the heat shield cylinder 4 so as to protrude toward the inner peripheral side. Note that the inner flange portion 4a can be formed by trimming the waste meat Din (in this case, the waste meat Din has the same thickness as the inner flange portion 4a) without projecting the small diameter portion 10b at the upper end of the core portion 10a. However, in this case, burrs occur at the lower edge (in the case of trimming from above) and the upper edge (in the case of trimming from below) of the inner periphery of the inner flange portion 4a during the trimming of the waste meat Din. Deburring is required in the process. On the other hand, if the small diameter portion 10b is protruded from the upper end of the core portion 10a,
If a step is formed between the inner flange portion 4a and the waste Din, and if the trim of the waste Din is performed from the back side of the step, that is, from above, the burr is absorbed by the step and the deburring step becomes unnecessary. Further, instead of protruding the small diameter portion 10b from the core portion 10a of the lower die 10, a small diameter portion may be protruded from the upper die 11. In this case, trimming is performed from below.

If the burner cap 1 is formed as in the present embodiment, the heat shield cylinder 4 can be formed in a tapered shape whose diameter is reduced upward, and the inner flange portion 4a can be formed at the upper end of the heat shield cylinder 4. In addition, the opening diameter of the upper end of the heat shield cylinder 4 can be made as small as possible, so that the infiltration of boiled juice and the like from the upper end of the heat shield cylinder 4 can be prevented. In addition, by increasing the inner diameter below the gap 6, secondary air can flow smoothly from below toward the gap 6. Further, since the heat shield cylinder 4 is formed in a tapered shape whose diameter is reduced upward, the amount of material of the heat shield cylinder 4 is reduced. Therefore, the rib 7 is extended over the upper end of the heat shield cylinder 4. However, the material costs do not increase. The present invention can be similarly applied to a case where the burner cap 1 is formed by die casting.

[Brief description of the drawings]

FIG. 1 is a sectional view of a burner burner equipped with a burner cap according to the present invention.

FIG. 2 is a perspective view of the burner cap.

FIG. 3 is a cross-sectional view showing a state when the burner cap is formed.

4A is a cross-sectional view of a conventional example, and FIG. 4B is a cross-sectional view showing a state of a conventional example at the time of molding.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Burner cap 3 Cap main body 3b Teeth 4 Heat shield cylinder 4a Inner flange part 5 Temperature sensor 6 Gap 7 Rib 10 Lower mold

Claims (2)

(57) [Claims] 1. A burner cap comprising: an annular cap main body having protruding teeth for forming flame holes on a lower surface thereof; and a heat shield cylinder located above the cap main body, into which a temperature sensor for detecting a temperature of a pot bottom is inserted. Wherein a gap is formed over the entire circumference between the upper surface of the cap body and the lower end of the heat shield cylinder, and a plurality of circumferential ribs span the cap body and the heat shield cylinder between the inner peripheral surfaces thereof. Each rib is extended over the upper end of the inner peripheral surface of the heat shield cylinder, and a split surface is set on the inner peripheral surface of the heat shield cylinder at a portion corresponding to the upper end of the heat shield cylinder. A burner cap characterized in that a draft is provided for pulling down a lower mold of a molding die for the burner cap. 2. The burner cap according to claim 1, wherein an inner flange portion protruding inwardly is formed at an upper end of the heat shield cylinder.