JPH0689884B2 - Valve opening adjustment mechanism for gas appliances - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a valve opening adjusting mechanism for a gas appliance, and particularly, in the case of a small opening degree such as low heat and low heat in a stove. It exhibits good characteristics.

(Prior Art) A gas appliance of this type is provided with a valve that opens and closes by attaching and detaching the gas container in a governor that adjusts a gas flow supplied from the gas container, and is provided in a gas passage separately from the valve. It usually has a structure in which the opening / closing plug is opened / closed by operating it with a tool stopper pick.

(Technical problem) Since the above-mentioned structure adjusts the valve opening degree according to the change of the cross-sectional area of the circular opening of the opening / closing plug, the adjustment at full opening or its vicinity can be performed, but the adjustment by the micro thermal power is not possible. I am not good at it.

The present invention is to solve the above-mentioned problems, and its object is to improve the control in the minute valve open state, improve the operability, and structurally simplify the valve opening control for gas appliances. To provide a mechanism.

(Technical Means) The purpose is to provide a rotary knob, a cam plate that advances in the axial direction by the rotation thereof, an operating shaft that engages with the cam plate at the rear end portion, and has a front end portion connected to a diaphragm. Provided on the side of the pressure regulating chamber that is partitioned by the diaphragm, and the valve opening is adjusted by the rotation of the knob in contact with the front end side of the operating shaft at one end and in a compressed state between the diaphragm and the cam plate. It can be reached by a structure including spring means which is interposed and biases the cam plate in the backward direction and has a small initial deflection amount so as to oppose the valve shaft.

(Example) Hereinafter, description will be given with reference to the drawings.

FIG. 1 shows a cross section of a main part of a gas appliance in which an adjusting mechanism according to the present invention is incorporated. 1 is a governor main body, 2 is a cover thereof, and 3 is an appliance stopper rotatably supported by a governor cover 2. The knob 4 is a cam 5 provided on the end surface of the knob 3 in the circumferential direction.
Indicates a cam plate that is axially pushed forward along the cam. The cam plate 5 has a through hole 6 penetrating through the center thereof, and an operating shaft 7 inserted from the rear side into the cam plate 5 engages with the cam plate 5 to extend forward, the front surface is cut into a concave shape, and the spring means described later therein. One end of 10 is in contact.

Reference numeral 8 denotes a diaphragm, which is a flexible film-like member provided between the main body 1 and the cover 2 and partitioning and sealing the pressure adjusting chamber 9 on the main body side. The tip of the operating shaft 7 is connected to the center of the diaphragm 8 and moves integrally in the axial direction.
11 is a retainer located outside the diaphragm 8 and locked to a step near the tip of the operating shaft, 12 is a spacer located on the pressure regulation chamber side with the diaphragm 8 in between, and the retainers 11 to 12 are located at the tip of the shaft. It is fixed to the operating shaft 7 by the caulking deformation portion 13. Since the diaphragm 8 is fixed by caulking the tip of the actuating shaft 7, thread cutting, nuts, etc. in the case of screwing are unnecessary.

A load of a pair of spring means 10, 20 acting on both sides is applied to such a diaphragm 8. One spring means 10 is interposed between the diaphragm 8 and the cam plate 5 and has a small initial deflection amount. The spring means 10 is a conical coil spring having a large diameter on the diaphragm side and a small diameter on the cam plate side. The other spring means 20 is a cylindrical coil spring, and any of them acts as a compression spring.

Reference numeral 14 is a valve shaft incorporated in the governor body 1, one end of which is in contact with the shaft end of the operating shaft 7 and which is also elastically pushed from the other end by mounting the gas container B through the valve opening member 17. . Reference numeral 15 denotes a gas passage into which the valve shaft 14 is inserted, and 16 denotes a valve seat member formed around the passage 15 to separate the valve chamber 19 and the pressure adjusting chamber 9 of the main body from each other. It is opened and closed by an O-ring 18 which comes into contact with and separates from the valve seats on the passage side 14. Therefore, it suffices if the O-ring mounting groove is provided on the outer surface of the valve shaft, and the sealing structure is remarkably simplified. The valve opening member 17 is a tubular shape having a through hole in the center,
A spring 21 provided between the valve seat member 16 and the valve seat member 16 pushes it toward the gas container. A closing spring 22 for the valve shaft 14 is set to be stronger than the closing spring c for closing the nozzle n of the gas container B.

In each figure, 23 is a receiving member provided outside the valve chamber 19 and having a receiving port for the nozzle n, and 24 is a magnetic holding mechanism for magnetically holding the container flange f. Further, 25 is a cam lever for a safety mechanism provided on the instrument stopper knob 3 outside the governor cover, 26 is a piezoelectric unit holder provided on the governor cover 2, 27 is a torsion spring hung between these members, and via the cam lever 25. The knob 3 is biased in the opening direction. 28 is a corrugated spring that applies a torque to the knob 3, 29 is a piezoelectric unit attached to the holder 26, 30 is a pin of a safety mechanism with which the cam lever 25 can abut or pass, and the spring 31 causes the container flange f.
Both can be contacted or pressed.

(Operation) In the gas appliance having the mechanism of the present invention configured as described above, when the nozzle n of the gas container B is inserted into the receiving opening of the governor body and the magnetic holding mechanism 24 magnetically holds the container B,
Gas is discharged into the valve chamber 19. When the instrument stopper knob 3 is rotated in this state, the cam plate 5 advances toward the main body in accordance with the rotation angle, and the operating shaft 7 advances toward the diaphragm via the one spring means 10 accordingly. Since the valve shaft 14 is pushed,
O-ring 18 separates from valve seat and gas passes from valve chamber 19
5. Flows through the gas passage which goes through the pressure adjusting chamber 9 to the combustion part (not shown).

By this pinching operation, the valve opening, that is, the O-ring 18 of the valve shaft 14
Although the size of the space formed by the valve seat can be changed, the force that actually pushes the valve shaft 14 is under the action of the two spring means 10, 20, one spring means 10 being a conical coil spring and the other spring means. The reference numeral 20 is a cylindrical coil spring and has an appropriately set spring characteristic, so that the initial amount of deflection is small. Therefore, in a state where the gas flow rate is small, the amount of movement of the valve shaft is small and the flow rate is easily managed with respect to the rotation amount of the knob 3.

(Effect) Therefore, according to the present invention, since the opening degree can be easily adjusted in the subtle valve opening state and the subtle adjustment can be made, it becomes possible to cook a low heat or a low heat when a cooking stove is used. This will increase the degree of freedom in, and also save fuel. Further, since the adjustment can be performed by a subtle rotation operation of the knob, the operability is good, and the structure in which the valve shaft is directly operated by the knob is structurally simple and has a remarkable effect in practical use.

[Brief description of drawings]

The drawings show an embodiment of an adjusting mechanism according to the present invention.
The figure is a cross-sectional side view of the main part, and FIG. 2 is a front view. 3 ... knob, 5 ... cam plate, 7 ... operating shaft, 8 ... diaphragm, 9 ... pressure adjusting chamber, 10, 20 ... spring means, 14 ... valve shaft, 15 ... gas passage, 18 ... O-ring, 19 ... Valve chamber, B ... Gas container.

Claims (4)

[Claims] 1. A rotary knob, a cam plate that advances axially by its rotation, a working shaft that engages with the cam plate at its rear end portion, and has a front end portion connected to a diaphragm, and a diaphragm. Provided on the side of the pressure regulating chamber, the one end of which is in contact with the front end side of the operating shaft and whose valve opening is adjusted by the rotation of the knob, and is interposed in a compressed state between the diaphragm and the cam plate. A valve opening adjusting mechanism for a gas appliance, comprising: spring means for urging a cam plate in a backward direction and having a small initial deflection amount so as to oppose the valve shaft. 2. The valve opening adjusting mechanism for a gas appliance according to claim 1, wherein the spring means is a conical coil spring having a large diameter on the diaphragm side and a small winding diameter on the cam plate side. 3. A valve opening for a gas appliance according to claim 1, wherein the valve shaft is fitted in the gas passage, and has an O-ring on its peripheral surface which comes in contact with and separates from the valve seat on the passage side. Adjustment mechanism. 4. A retainer, which is located outside the diaphragm at the connecting portion between the operating shaft and the diaphragm, is locked to the step portion of the operating shaft, and a spacer is provided on the pressure adjusting chamber side. The valve opening adjustment mechanism for gas appliances according to claim 1, wherein the spacer is fixed by the portion.