JPH09250715A - Burner cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the aperture diameter of the upper end of a thermal insulation cylinder and prevent boiling and spilling soup from entering therefrom by extending respective ribs and providing a draft on the inner peripheral surface of the thermal insulation cylinder into which a pan bottom temperature sensor is inserted and which is connected to a cap main body by a plurality of ribs. SOLUTION: A burner cap 1 applied to a cooking appliance burner having a temperature sensor 5 for detecting a pan bottom temperature is provided with an annular cap main body 3 having teeth 3b for forming flames protruding on the outer peripheral part of its lower surface. A thermal insulation cylinder 4 is provided above it and the temperature sensor 5 is housed in the thermal insulation cylinder 4 while it is urged by a spring. The cap main body 3 is connected to the thermal insulation cylinder 4 through ribs 7 extending astride the inner peripheral surfaces of both the members 3 and 4 in a space 6 formed in their entire peripheries. A split surface of a mold is set to a part corresponding to the upper end part of the thermal insulation cylinder 4 and the inner peripheral surface of the thermal insulation cylinder 4 is provided with a draft for trimming the core part of a female mold downward, that is, a tapered part in which the diameter is gradually reduced upward.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as a burner cap of this type,
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 tube d located above the cap body b into which a temperature sensor c is inserted, A gap e is formed over the entire circumference between the upper surface of the cap body b and the lower end of the heat shield tube d, and the cap body b and the heat shield tube d extend in the circumferential direction between the inner peripheral surfaces of both b and d. Ribs f at multiple locations
Those connected by are known.

In this case, the radiant heat from the flame rising to the outer circumference of the burner is blocked by the heat shield tube d, so that the temperature of the pot bottom can be accurately detected by the temperature sensor c, and
Secondary air can be supplied from the inside of the burner to the combustion section on the outer periphery through the gap e.

[0004]

When manufacturing a burner cap, a cap mold b and a heat shield are used by using a molding die composed of a lower mold ML and an upper mold MU as shown in FIG. 4 (B). After the cylinder d and the ribs f are integrally formed by forging, the inner diameter side paddle g and the outer diameter side paddle g, which are formed in the gap between the split surfaces of the lower die ML and the upper die MU, are trimmed. 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 tube d. In this case, if the split surface of the molding die to be 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 out downward, so 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 tube d, and the inner peripheral surface of the heat shield tube d is forced to have a draft for pulling the upper die upward. The opening diameter of the upper end becomes large, and spilled juice or the like easily enters from the upper end of the heat shield tube d. In addition, the inner diameter of the burner cap becomes smaller at the small-sized trimming portion on the inner diameter side, and the flow of the secondary air toward the gap e is restricted at the trimming portion.

In view of the above points, an object of the present invention is to provide a burner cap in which the opening diameter at the upper end of the heat shield tube can be made as small as possible and the inner diameter below the gap can be made large.

[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 teeth for forming flame holes projecting on the lower surface thereof, and a heat shield cylinder located above the cap body, into which a temperature sensor for detecting the temperature of the pot bottom is inserted. Therefore, a gap is formed over the entire circumference between the upper surface of the cap body and the lower end of the heat shield tube, and there are multiple ribs in the circumferential direction that extend between the inner peripheral surface of the cap body and the heat shield tube. In the connection, each rib extends 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 that matches the upper end of the heat shield cylinder. There is a draft for removing the lower die of the burner cap molding die downward.

According to the present invention, even when 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, so that the rib is attached to the lower mold. The upper end does not get caught,
The lower mold can be pulled out downward. Then, the opening diameter at the upper end of the heat shield tube is made smaller than that of the conventional example by forming a downward draft on the inner peripheral surface of the heat shield tube, that is, by tapering the diameter of the heat shield tube upward. 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 that projects to the inner circumference at the upper end of the heat shield cylinder, and as a result, the heat shield cylinder The opening diameter at the upper end can be reduced as much as possible. Thus, spilled juice, etc. can be effectively prevented from entering from the upper end of the heat shield tube, and the inner diameter below the gap can be increased to allow the secondary air to flow smoothly from below to the gap. it can.

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

[0010]

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

The burner cap 1 comprises an annular cap body 3 and a heat shield tube 4 located above the cap body 3. Then, a cylindrical portion 3a on the inner peripheral side that extends downward is formed in the cap body 3, and a large number of teeth 3b are circumferentially spaced and project from the outer peripheral portion of the lower surface of the cap body 3 to form the cylindrical portion 3a. The tooth 3b is seated on the upper surface of the burner body 2 in a state where it is fitted to the inner circumference of the burner body 2 so that gas is ejected outward from the flame holes formed in the gaps between the teeth 3b. ing.

A temperature sensor 5 for contacting the bottom of the pan and detecting its temperature is inserted into the heat shield cylinder 4 by urging it upward by a spring (not shown). When the pan bottom overheats, the temperature sensor 5 is inserted. I am trying to extinguish the stove burner with 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, and this gap 6 is provided from the inner space of the stove burner to the outer combustion area. Secondary air is supplied. Cap body 3
The heat shield cylinder 4 and the heat shield cylinder 4 are connected to each other via a rib 7 extending between the inner peripheral surfaces of the both 3, 4, and the rib 7 is provided at a plurality of circumferential positions, for example, at intervals of 120 ° as shown in FIG. It is provided in the place.

When manufacturing the burner cap 1, as shown in FIG.
After the cap body 3, the heat shield tube 4, and the rib 7 are integrally formed by forging using a molding die including the lower die 10 and the upper die 11 as shown in FIG. The inner diameter side pad Din and the outside diameter side pad Dout formed by the gap between the split surface portions are trimmed, and then only the rib 7 is cut between the cap body 3 and the heat shield tube 4. The entire circumference is cut so that the gap 6 is formed so as to be left. The trimmed flesh Din and Dout are melted and reused as a burner cap material.

Here, each rib 7 extends over the upper end portion of the inner peripheral surface of the heat shield cylinder 4, and therefore, the core portion 10a of the lower die 10 and the upper portion of the lower mold 10 inserted into the heat shield cylinder 4 are covered. 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
The 0 can be pulled out downward without being disturbed by the rib 7.
Therefore, in the present embodiment, the split surface is set to a portion that matches the upper end portion of the heat shield cylinder 4, and the inner peripheral surface of the heat shield cylinder 4 is punched out to remove the core portion 10a of the lower mold 10 downward. It has a slope, that is, a taper that reduces in diameter upward.

Further, in this embodiment, the small diameter portion 10 having the same diameter as the circle inscribed in the three ribs 7 is provided on the upper end of the core portion 10a.
An inner flange portion 4a is formed at the upper end of the heat shield cylinder 4 by projecting b. The inner flange portion 4a can be formed by trimming the dead meat Din (in this case, the dead meat Din has the same thickness as the inner flange portion 4a) without providing the small diameter portion 10b at the upper end of the core portion 10a. However, in this case, burrs are generated 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 circumference of the inner flange portion 4a during the trimming process of the pad Din. Deburring is required in the process. On the other hand, if the small diameter portion 10b is provided at the upper end of the core portion 10a,
A step is formed between the inner flange portion 4a and the pad Din, and if the pad Din is trimmed from the back side of the step, that is, from above, the burr is absorbed by the step, and the deburring step is unnecessary. Further, instead of projecting the small diameter portion 10b on the core portion 10a of the lower mold 10, the small diameter portion may be projected on the upper mold 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 with its diameter reduced upward and the inner flange portion 4a can be formed at the upper end of the heat shield cylinder 4. The opening diameter of the upper end of the heat shield cylinder 4 can be made as small as possible to prevent infiltration of spilled juice or the like from the upper end of the heat shield cylinder 4. Further, the inner diameter below the gap 6 can be increased so that the secondary air can smoothly flow toward the gap 6 from below. Further, since the heat shield cylinder 4 is formed in a taper shape in which the 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 portion of the heat shield cylinder 4. However, the material cost does not increase. The present invention can be similarly applied to the case where the burner cap 1 is die cast.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a stove burner including 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 during molding of the burner cap.

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

[Explanation of symbols]

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

Claims (2)

[Claims] 1. A burner cap provided with an annular cap body having teeth for forming flame holes projecting from the bottom 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. And a rib is formed at a plurality of circumferential positions between the upper surface of the cap body and the lower end of the heat shield tube, and a gap is formed over the entire circumference and between the cap body and the heat shield tube between the inner peripheral surfaces of the two. In the case of connecting with each other, each rib extends 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 matching the upper end of the heat shield cylinder. A burner cap characterized by having a draft for pulling out a lower die of the burner cap molding die. 2. The burner cap according to claim 1, wherein an inner flange portion is formed at an upper end of the heat shield cylinder so as to project toward an inner peripheral side.