JPH06213428A - Valve for combustion apparatus - Google Patents

Abstract

PURPOSE:To manufacture only by casting without cutting. CONSTITUTION:A valve for a combustion apparatus comprises a cast safety valve body 5, a valve hole 50 formed at the body 5, a valve seat 55 surrounding a safety valve port 56 formed in an inner part of the hole 50, and a valve disc 65 inserted into the hole 50 to switch the port 56 in contact with the seat 55, wherein the hole 50 is tapered to be larger at an inlet side, and the seat 56 is a cast surface. A connecting part of the seat 55 to an inner periphery of the hole 50 is a corner having a radius of curvature R. The body 5 has an O-ring pressure contact surface 54 formed to be tapered by casting to seal it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion equipment valve provided in a gas phase fuel supply passage of a combustion equipment such as a gas stove.

[0002]

2. Description of the Related Art A conventional valve for a combustion device for gas-phase fuel such as gas is formed by casting a valve body and cutting a portion such as a valve seat as a sealing surface or an O-ring pressure contact surface, which requires dimensional accuracy. Are manufactured. However, the cutting process is time-consuming and produces cutting chips, and it is difficult to completely remove the cutting chips even after cleaning in the subsequent step. In addition, there is a defect that voids formed inside are exposed at the time of casting on the cutting surface, and defective sealing occurs at a constant rate.

[0003]

In order to eliminate the drawbacks caused by the cutting work, the valve body may be manufactured only by casting. However, in casting, it is difficult to obtain precise dimensional accuracy, and since there is a slight deformation when the mold is drawn out, the precision tends to decrease. Therefore, the valve body manufactured only by casting has not been put into practical use. An object of the present invention is to provide a valve for a combustion device that can be manufactured only by casting without cutting.

[0004]

According to the present invention, there is provided a cast valve body, a valve hole formed in the valve body, a valve seat surrounding a valve opening formed in the back of the valve hole, and the valve. In a valve for a combustion device having a valve body that is inserted into a hole and that opens and closes the valve opening by contacting the valve seat, the valve hole is a tapered hole with a large inlet side, and the valve seat is a casting surface. Characterize. In the configuration according to claim 2, the connecting portion between the valve seat and the inner peripheral surface of the valve hole is a corner having a radius of curvature. In the structure according to the third aspect, the valve body has an O-ring pressure contact surface for sealing which is tapered at the inlet of the valve hole by casting.

[0005]

In the valve body of the present invention, the valve hole is a tapered hole having a large inlet side and the valve seat is a casting surface, so that the mold can be easily drawn out. Therefore, the deformation of the product at the time of drawing the mold is small, the position of the valve seat can be accurately set, and the flatness of the valve seat surface is high. As a result, it is possible to mass-produce the valve body that can withstand practical use only by casting at low cost. In the valve body according to the second aspect, the connecting portion between the valve seat and the inner peripheral surface of the valve hole is a corner having a radius of curvature. Therefore, the mold can be pulled out more easily. In the valve body according to the third aspect, the O-ring pressure contact surface is a tapered surface and the casting surface is used as it is. Therefore, it is possible to secure the sealing property without performing cutting work, and it is possible to solve the problems of removing cutting chips and exposing holes on the cutting surface.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on the embodiments shown in the drawings. 2 and 3, reference numeral 100 denotes a gas control device in a combustion device that burns a gas phase fuel such as fuel gas or vaporized petroleum fuel, and the stove burner 20 shown in FIG.
Control the supply of fuel gas to zero. Hob burner 200
Comprises a large annular burner 201 and a small burner 202 arranged inside thereof. The gas control device 100 includes a valve assembly 1. The valve assembly 1 is provided with a large nozzle 11 and a small nozzle 12 for ejecting gas to the large burner 201 and the small burner 202 in parallel, and adjusts the amount of gas supplied to the large nozzle 11 and the small nozzle 12. A first control valve 13 and a second control valve 14 are provided. The first control valve 13 is operated by the heat power adjusting lever 15 to control the gas flow rate to the large nozzle 11, and the second control valve 14 is operated by the link mechanism 16 interlocking with the heat power adjusting lever 15 to the small nozzle 12. Control the gas flow rate. A main valve 2 is provided upstream of the first control valve 13 and the second control valve 14, and an electromagnetic safety valve 3 is attached further upstream thereof.

The valve assembly 1 includes a valve body 4 manufactured by die casting of an aluminum alloy,
The safety valve body 5 is fastened to the valve body 4. As shown in FIGS. 1 and 2, the main valve body 41 of the main valve 2 is integrally provided on the upstream side of the valve body 4. The main valve body 41 is one side (left side in the figure; upstream side)
Has a taper valve hole 42 with a large diameter, and a gas passage portion 43 downstream is connected to the other, and a small diameter operation rod holding cylinder portion 44 extends in the gas passage portion 43. . A valve seat 45 is formed between the main valve body 41 and the gas passage portion 43,
A main valve opening 46 is opened in the center of the valve seat 45.

The valve hole 42 is a tapered hole with a taper angle α = 4 degrees, and the valve seat 45 is a casting surface that has not been machined, and the valve seat 45 and the valve hole 4 are
The connecting portion with the inner peripheral surface of 2 is a corner with a radius of curvature R = 2.0 mm. Further, the main valve body 41 is provided with an O-ring pressure contact surface 47 for sealing which is formed in a tapered shape by casting at the inlet of the valve hole 42, and an O-ring 48 is fitted therein. A flange 49 is formed at the tip of the main valve body 41 and serves as a mounting portion for the electromagnetic safety valve 3.
The tip of the operation rod holding cylinder portion 44 serves as a mounting portion for the operation mechanism.

The main valve 2 has an operating rod 21 which is inserted and mounted in the core of the main valve body 41. A rubber main valve body 22 and a protective washer 23 for the main valve body 22 are externally fitted to an intermediate portion of the operation rod 21, and the main valve body 22 opens and closes the main valve port 46. A return spring 24 is mounted between the protective washer 23 and a safety valve body 5 to be described later, and the operating rod 21 is biased rightward in the figure by a spring force. Further, the operating rod 21 is slidably supported by the operating rod holding cylinder portion 44 via a seal mechanism 25.

One end of the electromagnetic safety valve 3 is the main valve body 4
1. The safety valve body 5 fastened to the end face of 1 and the outer periphery,
Having a lid plate 61 fastened to the other end surface of the safety valve body 5,
An electromagnetic valve 6 housed in the safety valve body 5 and the lid plate 6
1 and an outlet 62 fixed to the outer surface of the same. Figure 4
As shown in FIGS. 6A and 6B, the safety valve body 5 is a valve lower cylinder portion 52 having an end surface provided with a flange 51 that is attached to the flange 49 at one end side. At the other end of the safety valve body 5, a valve hole 50 is formed inside, and a taper cylinder portion 53 for accommodating the solenoid valve 6 is provided. An O-ring pressure contact surface 54 is formed at the end of the tapered cylindrical portion 53,
A valve seat 5 is provided between the valve lower cylinder portion 52 and the tapered cylinder portion 53.
5 and a safety valve opening 56 are formed. A lateral hole 57 with a flange that communicates with the gas supply pipe 17 (see FIG. 3) is provided on the side of the tapered cylindrical portion 53.

The safety valve body 5 is manufactured by aluminum die casting, taken out of the mold, and then shot peened, and is not cut. The valve hole 50 expands toward the end portion with a taper angle α = 2 degrees, and the O-ring pressure contact surface 54 is a taper surface with a taper angle β = 90 degrees. Also valve hole 5
The radius of curvature R of the joint between the inner peripheral surface of No. 0 and the valve seat 55 is 1.0
The corner is over mm. With this configuration, the safety valve body 5 can easily draw out the mold fitted in the valve hole 50, and the deformation of the safety valve body 5 hardly occurs at the time of mold release, so that the accuracy can be practically used only by casting.

The taper angle α of the valve hole 50 or the valve hole 42 needs to be 1.0 degree or more, and the upper limit may be large, but it is practically about 5 degrees or less due to the structure of the safety valve body 5. Become. Further, the taper angle β of the O-ring pressure contact surface 54 or 47 is set to 60 in order to secure the sealing property.
It is desirable that the angle is not less than 120 degrees and not more than 120 degrees. further,
Inner peripheral surface of valve hole 50 or 42 and valve seat 55 or 45
If the radius of curvature R of the joint portion with is 0.25 mm or more, the mold can be smoothly drawn out, and the upper limit is about 2.0 mm in order to secure the valve seat surface which is an annular flat surface. Incidentally, conventionally, the valve seats 55, 45 or the O-ring pressure contact surfaces 54, 47 have been cast on the premise that they are subjected to cutting work in a later step. For this reason, no deformation measures are taken at the time of die cutting, the taper angle α is about 1 degree, and the taper angle β is 1 degree.
It was set to 50 to 180 degrees. For this reason, the safety valve body 5 is largely deformed when the mold is pulled out, resulting in insufficient accuracy.

As shown in FIG. 1, the solenoid valve 6 includes the lid plate 6
1 has an electromagnet 63 fastened to the inner surface, a plunger 64 installed inside the electromagnet 63, a flange-shaped rubber valve body 65 attached to the tip of the plunger 64, and a return spring 66 for the plunger 64. . Lid plate 6
An O-ring 67 is fitted between 1 and the O-ring pressure contact surface 54 to form a seal. This solenoid valve 6
While the electromagnet 63 is energized, the return spring 66 is compressed to hold the plunger 64 in the electromagnet 63, and when the energization is stopped, the spring force of the return spring 66 pushes the plunger 64 out of the electromagnet 63.

At the end of the operating rod holding cylinder portion 44, the main valve 2
An ignition operation mechanism 7 for opening and closing the solenoid valve and setting and resetting the electromagnetic safety valve 3 is engaged. The ignition operating mechanism 7 is composed of the operating rod 21 and a setting mechanism 71 fastened to the ends of the operating rod holding cylinder 44. The reset mechanism 71 has a mechanism case 72, a push button 73, a return spring 74 of the button 73, and a micro switch 75. In this ignition operation mechanism 7, once the push button 73 is pushed in the maximum amount, the tip of the push button 73 pushes the operating rod 21 and the plunger 64 to displace it to the left in the drawing. As a result, the main valve opening 4 closed by the main valve body 22
6 and the safety valve opening 5 closed by the safety valve body 65
6 opens. When you release your hand from the push button 73, the push button 7
No. 3 stops at the intermediate position, maintains the valve open state of the main valve port 46, and recognizes that the push button 73 is currently pushed.

When the stove burner 200 is ignited in conjunction with the pushing operation of the push button 73 and the electromotive force of the attached thermocouple increases, the plunger 64 is attracted to and held by the electromagnet 63 by electromagnetic force. Thus, the open state of the electromagnetic safety valve 3 is maintained. If you press the push button 73 again,
The push button 73 returns to the original position, the main valve port 46 is closed, and the stove burner 200 is extinguished. Due to this fire extinguishing, the thermocouple loses electromotive force, and the electromagnetic safety valve 3 is pressed by the spring force of the spring 66 to close the valve. When the burner 200 misfires for some reason, the thermocouple loses electromotive force and closes in the same manner as above.

[Brief description of drawings]

FIG. 1 is a plan sectional view of a combustion equipment valve of the present invention.

FIG. 2 is a plan sectional view of a gas control device for a stove burner according to the present invention.

FIG. 3 is a plan view of a stove burner of the present invention.

FIG. 4 is a plan sectional view of a safety valve body of the present invention.

FIG. 5 is a front view of the safety valve body of the present invention.

FIG. 6 is a right side view of the safety valve body of the present invention.

[Explanation of symbols]

 1 Valve Assembly 2 Main Valve 3 Electromagnetic Safety Valve 4 Valve Body 5 Safety Valve Body 6 Solenoid Valve 7 Ignition Operating Mechanism 50 Valve Hole 55 Valve Seat 54 O-ring Pressure Contact Surface 56 Safety Valve Port 65 Valve Body

Claims (3)

[Claims] 1. A cast valve body, a valve hole formed in the valve body, a valve seat surrounding a valve port formed deep in the valve hole, and a valve seat inserted into the valve hole, A valve for a combustion device having a valve body that opens and closes the valve opening by contacting a valve, the valve hole being a taper hole having a large inlet side, and the valve seat being a casting surface. . 2. The valve for a combustion device according to claim 1, wherein the connecting portion between the valve seat and the inner peripheral surface of the valve hole is a corner having a radius of curvature. 3. The valve for a combustion device according to claim 1, wherein the valve body has an O-ring pressure contact surface for sealing formed by tapering at an inlet portion of the valve hole. .