JPH1151372A - Rotary gas-valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a manual operation by light force by rotating an operating shaft by an electric motor via a reduction gear mechanism, and interposing a torque limiter mechanism between the gear mechanism and the shaft. SOLUTION: Mainly regarding a gas cooking appliance with temperature regulating function, gas is supplied to a standard burner 3 via the rotary gas valve device A. The device A comprises a safety valve 10 and a flow regulating valve 11 in a lengthwise valve casing 9. And, an output torque of an electric motor 18 is transmitted to an operating shaft 15 via a reduction gear mechanism 20. The mechanism 20 has a driving gear 200 of the motor 18, a worm integral with a driven gear 201 and a worm wheel 203 on the shaft 15 engaged with the worm. Here, since a torque limiter mechanism 21 is interposed between the mechanism 20 and the shaft 15, even if rotation of the mechanism 20 is restricted, the shaft 15 can be manually rotated by a lighter force by means of a slip of the mechanism 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary gas valve mainly applied to a gas stove having a temperature control function.

[0002]

2. Description of the Related Art Recently, as a gas stove with a temperature control function,
A manual flow rate control valve and an electric flow rate control valve driven by an electric motor are interposed in the gas supply path of the burner. When the mode is selected, it is conceivable that the electric flow rate regulating valve is controlled so that the temperature of the object to be cooked is maintained at the set temperature based on a signal from the temperature sensor that detects the temperature of the object to be cooked. I have.

By the way, as a gas valve device for a stove,
A flow control valve, a safety valve, and a rod facing the safety valve are provided in the valve casing. The forward rotation of the rod to the ignition position causes the rod to advance to the safety valve side against the return spring to push and open the safety valve, and when the normal rotation operation of the operating shaft is released at the ignition position, the return spring biases. 2. Description of the Related Art There is known a rotary gas valve device in which a rod is retracted while an operation shaft is reversed at a predetermined angle to release a pressure on a safety valve.

In such a rotary gas valve device, the flow control valve is generally constituted by a taper stopper, but a flow control valve constituted by a needle valve provided on a rod is also disclosed in Japanese Patent Laid-Open No. 9-1.
No. 01024 is known.

Further, the cam mechanism comprises a cam fixed to the casing, a first follower locked to the operation shaft and slidably engaged in the front-rear direction, and an engagement provided on the first follower. The second follower engages with the portion in the longitudinal guide groove in the front-rear direction and rotates forward and reverse with the forward and reverse rotation of the first follower. Here, the cam mechanism has a rod that is moved back and forth in conjunction with the back and forth movement of the second follower.
No. 97, the rod is moved back and forth in conjunction with the forward and backward movement of the first follower,
There is a second type as shown in Japanese Utility Model Publication No. 63-2777.

In the first type of cam mechanism, the first follower is guided by the cam in forward and reverse rotations so as to move forward and backward, and the guide groove of the second follower is formed with the wide portion on the rear side. It is formed in a stepped shape having a narrow portion on the front side, and when the operation shaft is rotated forward from the fire extinguishing position to the ignition position, the engaging portion of the first follower is positioned between the wide portion and the narrow portion of the guide groove. , The second follower is prevented from retreating relative to the first follower, and the rod opposes the return spring via the second follower as the first follower moves forward with forward rotation. When the safety valve is depressed and opened from the retreat end position to the forward end position, and the normal rotation operation of the operation shaft is released at the ignition position, the operation shaft reversely rotates by a predetermined angle,
The engaging portion of the first follower shifts from the step of the guide groove to a narrow portion extending forward, and the second follower and the rod recede with respect to the first follower by the urging force of the return spring, thereby causing the safety valve to move backward. The pressure is released.

In the second type of cam mechanism, the second type
The follower is guided by the cam in forward and reverse rotations to be advanced and retracted, and the guide groove of the second follower is formed in a stepped shape having a wide portion on the front side and a narrow portion on the rear side. When the operating shaft rotates forward from the fire-extinguishing position to the ignition position, the engaging portion of the first follower engages with the forward step between the wide portion and the narrow portion of the guide groove, and the second follower The first follower is prevented from retreating, and the rod is opposed to the return spring via the first follower as the second follower advances with the forward rotation of the second follower via the first follower. When the safety valve is advanced from the retreat end position to the forward end position, the safety valve is pressed open, and the normal operation of the operation shaft is released at the ignition position, the operation shaft reverses by a predetermined angle, and the engagement portion of the first follower is engaged. Is shifted from the step of the guide groove to a narrow portion extending rearward, and the first follower and the rod are biased by the return spring against the second follower. Retreat to so that the pressure of the safety valve is released.

[0008]

The flow rate adjusting valve of the conventional rotary type gas valve device is of a manual type. If an electric type flow rate adjusting valve for temperature control is provided separately from the flow rate adjusting valve, the cost is high. Become.

In this case, the operation shaft of the rotary gas valve device can be rotated by an electric motor to constitute a manual and electric hybrid gas valve device. When the temperature control mode is selected, the operation shaft is controlled by the electric motor. If the flow rate control valve is controlled by rotation, a separate electric flow rate control valve is not required, and the cost can be reduced.

Here, the power source of the gas stove is a dry battery, and a small motor with low power consumption must be used as the electric motor. In order to obtain the torque required to rotate the operation shaft, It is necessary to interpose a reduction mechanism having a large reduction ratio between the electric motor and the operation shaft. In this case, if a worm is incorporated in the reduction mechanism, the reduction ratio can be increased without increasing the size of the reduction mechanism. However, in this case, since the worm does not easily rotate when the electric motor is not operating, the manual operation force of the operation shaft increases,
Operability is impaired.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a manual and electric hybrid type rotary gas valve device capable of performing a manual operation with a light force.

[0012]

Means for Solving the Problems In order to solve the above problems,
According to the present invention, in a rotary gas valve device in which a flow regulating valve for increasing or decreasing the amount of gas supplied to a burner is provided in a valve casing and the flow regulating valve is operated by rotation of an operation shaft, the worm is operated by an electric motor. The operation shaft is rotatable via a speed reduction mechanism including the motor, and a torque limiter mechanism is interposed between the speed reduction mechanism and the operation shaft, or a clutch mechanism which is disengaged when the electric motor is not operated is interposed. doing.

With the provision of the torque limiter mechanism, even when the rotation of the speed reduction mechanism is restricted by the worm when the electric motor is not operated, the operation shaft can be manually rotated by the slip of the torque limiter mechanism. Here, the limiter value of the torque that can be transmitted by the torque limiter mechanism is set slightly higher than the torque corresponding to the rotational load of the operation shaft so that the torque limiter mechanism does not slip when the electric motor rotates the operation shaft. However, the limiter value is much smaller than the rotation restraining torque of the speed reducing mechanism by the worm, so that the operation shaft can be manually rotated with a light force, and the operability is not impaired. If a clutch mechanism is provided, the operation shaft can be manually rotated with a lighter force.

By the way, a safety valve and a rod facing the safety valve are provided in the valve casing in addition to the flow regulating valve, and a cam mechanism interlocking with the operation shaft rotates the operation shaft from the fire extinguishing position to the ignition position in the normal direction. The rod is advanced to the safety valve side against the return spring by pressing to open the safety valve, and when the normal rotation operation of the operation shaft is released at the ignition position, the operation shaft is reversely rotated by a predetermined angle by the biasing force of the return spring. When the rod is moved backward to release the pressure of the safety valve, when the torque limiter mechanism is used, the forward rotation at the ignition position is performed by the rotation restraining force of the reduction mechanism transmitted to the shaft via the torque limiter mechanism. When the operation is released, the operation axis does not reverse the predetermined angle,
There is a possibility that the release of the safety valve due to the retraction of the rod may not be obtained. In this case, if the connecting member to the operation shaft of the torque limiter mechanism is connected to the operation shaft so as to have a play corresponding to the predetermined angle, the operation shaft is restricted by the rotation of the speed reduction mechanism transmitted through the torque limiter mechanism. The rotation of the safety valve is reversed by a predetermined angle without receiving a force, so that the pressing of the safety valve can be reliably released.

[0015]

FIG. 1 shows a gas stove having a grill 1, a large burner 2 on the right side and a standard burner 3 on the left side. Is provided with a temperature sensor 3a for detecting by contacting the sensor.
On the front panel 4 of the stove, an operation knob 5 for a burner (not shown) for the grill 1, an operation knob 6 for the large burner 2,
An operation knob 7 for the standard burner 3 and a mode selection unit 8 for selecting a control mode of the standard burner 3 are provided. The mode selection section 8 includes a fry button 8a and a rice cook button 8b.
And a water heater button 8c.

Gas is supplied to the standard burner 3 through a rotary gas valve device A as shown in FIG. This gas valve device A is provided with a safety valve 10 and a flow regulating valve 11 behind the safety valve 10 in a longitudinally extending valve casing 9 in the longitudinal direction (the right side in FIG. 2 is the front). The gas flowing from an inlet 9a opened in the valve casing 9 is guided to an outlet 9b opened in an intermediate portion of the valve casing 9 via a safety valve 10 and a flow control valve 11.

The safety valve 10 is an electromagnet 10a which is energized and excited by a controller 13 which inputs a signal from a flame detecting element 12 such as a thermocouple for detecting the flame of the standard burner 3.
And a suction piece 10b facing the electromagnet 10a, and a suction piece 1
0b via a valve rod 10c, and a valve body 10e urged to the rear close side by a spring 10d. A rod 14 that can move back and forth is provided in the valve casing 9, and an operation shaft 15 connected to the operation knob 7 and an operation shaft 15 are provided at the rear end of the valve casing 9.
And a cam mechanism 16 for converting the rotation of the rod 14 into the forward and backward movements of the rod 14. The forward rotation of the operating shaft 15 from the fire extinguishing position to the ignition position moves the rod 14 from the retracted end position shown in FIG. The safety valve 10 is advanced to the forward end position against the return spring 14a, and the safety valve 10 is pressed and opened by the contact of the rod 14 with the valve body 10e. When the safety valve 10 is depressed and opened, the attracting piece 10b comes into contact with the electromagnet 10a, and when the standard burner 3 is ignited in this state, the electromagnet 10a is energized and excited by the signal of the flame detecting element 12 via the controller 13 so that the attracting piece 10b is activated. The safety valve 10 is attracted to the electromagnet 10a, and is held in the open state.

The flow regulating valve 11 is constituted by a needle valve having a tapered valve body 11b which can be inserted into a valve hole 11a formed in the valve casing 9 and has a diameter which decreases rearward. Is integrally formed with the rod 14, so that the supply gas amount is increased or decreased by the forward and backward movement of the rod 14. Further, a large-diameter valve element 11c made of an elastic material such as rubber is provided on the front side of the valve element 11b, and when the rod 14 is retracted to the retracted end position, the valve hole 11a is closed by the valve element 11c and the standard burner 3 is moved. Gas supply was shut off.

As shown in FIG. 4, the cam mechanism 16 includes a cam 160 fixed to the valve casing 9, a first follower 161 engaged with the operation shaft 15 so as to be able to move back and forth, and a first follower 161.
The first follower 1 engages with an engaging portion 161a provided on the first follower 161 in a longitudinally extending guide groove 162a.
And a second follower 162 that rotates forward and backward with the forward and reverse rotation of the shaft 61. Then, the rear end of the rod 14 is brought into contact with one of the first and second followers 161 and 162, in this embodiment, the first follower 161, and interlocks with the forward and backward movement of the first follower 161. The rod 14 is moved forward and backward, and the second follower 162 is guided by the cam 160 by the forward and reverse rotation to be moved forward and backward.

In more detail, the cam 160 is constituted by a cylindrical cam fitted to the rear part of the valve casing 9.
A pin-shaped engaging portion 162b is projected from the outer peripheral surface of the cylindrical second follower 162 inserted into the cam 160, and the engaging portion 1
62b is engaged with a helical cam groove 160a formed on the cam 160 and inclined forward in the normal rotation direction as shown in FIG.
0a to move back and forth. A projection 160b is formed on the outer peripheral surface of the cam 160 to prevent the cam 160 from rotating with respect to the valve casing 9.

Guide groove 16 formed in second follower 162
2a, as shown in FIG. 6, the wide portion 162a ₁ of the front,
A narrow portion 162a ₂ of the rear, wide portions 162a ₁ and a narrow portion 1
62a ₂ are formed on the forward stepped shape having a step 162a ₃ between consist projections projecting from the outer peripheral surface of the first follower 161 interpolates cylindrical Second follower 162 The engaging portion 161a is engaged with the guide groove 162a. Further, the first follower 161 is formed with a blind hole-shaped shaft hole 161b having a modified cross-sectional shape, and the front end portion 15a of the operation shaft 15 formed with the modified cross-sectional shape is inserted into the shaft hole 161b. The first follower 161 is slidably and non-rotatably engaged with the operation shaft 15.

In the fire extinguishing position of the operating shaft 15, the engaging portion 162b of the second follower 162 is connected to the cam groove 160 in FIG.
And the engaging portion 161a of the first follower 161
Exists at the position indicated by a in FIG. 6 of the guide groove 162a. When the operating shaft 15 forward from the extinguishing position, the engaging portion 161a is a guide groove 162a moves to the position indicated by b in FIG. 6 in contact with the forward direction of the groove edge of the wide portion 162a ₁ and the first follower 1
61, the second follower 162 is rotated forward, and the cam groove 16
The second follower 162 moves forward by being guided by Oa. At this time, the forward step 162a ₃ of the guide groove 162a engages with the engaging portion 161a, and the first follower 161 advances with the advance of the second follower 162, so that the rod 14
1 to advance from the retracted end position against the return spring 14a.

When the operating shaft 15 is rotated forward to the ignition position, the engaging portion 162b moves to the position shown by b in FIG. 5 of the cam groove 160, and the rod 14 moves to the forward end position as shown in FIG. The safety valve 10 is pushed forward and opened. Further, an ignition switch 17 mounted on the base plate 9c at the rear end of the valve casing 9 is turned on at an ignition position by a switch drive cam 17a engaged with the operation shaft 15 so as to prevent rotation, and the standard burner 3 is ignited.

After ignition, when the operator releases the operation knob 7 to release the normal rotation of the operation shaft 15, the first rotation is performed via the rod 14.
With the urging force of the return spring 14a acting on the follower 161, the operating shaft 15 is rotated in the reverse direction by a predetermined angle while the engaging portion 161 a
Moves over the step 162a ₃ to the narrow portion 162a ₂ of the guide groove 162a, where the first follower 161 and the rod 14
And retreat. When the engagement portion 161a is moved to the position indicated by c abuts against the rear end of the narrow portion 162a ₃ in Fig. 6, more retraction of the first follower 161 is prevented, the forward end of the rod 14 The retreat from the position is stopped at the intermediate position shown in FIG. At this intermediate position, the pressure of the safety valve 10 is released, but the flow regulating valve 11 is maintained in the fully open state, and the standard burner 3 is set to a high heat. Operation axis 1
The ignition switch 17 is turned off by the reverse rotation of the predetermined angle of 5.

Thereafter, when the operation shaft 15 is reversed, the first
The second follower 162 is reversely rotated via the follower 161 and is guided by the cam groove 160a so that the second follower 162 is retracted from its forward end position.
1 and the rod 14 are retracted from the intermediate position. In this case, the amount of gas supplied to the standard burner 3 is reduced by the flow control valve 11, and the heating power is reduced. Then, the engaging portion 162
When b moves to the position shown by c in FIG. 5 of the cam groove 160a, the large-diameter valve body 11c of the flow regulating valve 11 is moved to the valve hole 11a.
And the standard burner 3 is extinguished. Thus, after the ignition, the heating power of the standard burner 3 can be adjusted by reversing the operation shaft 15 in the angle range between b and c in FIG.

The first follower 161 is driven by the reverse rotation of the operation shaft 15.
Abuts on the base plate 9c to prevent further retreat, thereafter only the second follower 162 retreats, and the engaging portion 16
When the operating shaft 15 is returned to the fire extinguishing position when the operating shaft 15 is moved forward relative to the guide groove 162a, the engaging portion 161a
Then, it returns to the position indicated by a.

The cam mechanism 16 of this embodiment is of the second type in which the rod 14 is moved back and forth in conjunction with the first follower 161, but in conjunction with the second follower 162. It is also possible to configure the first type in which the rod 14 is moved back and forth. In the present embodiment,
Although the flow control valve 11 is constituted by a needle valve, the flow control valve may be constituted by a taper stopper. In this case, the second follower 162 is engaged with the taper stopper so as to be slidable in the front-rear direction. And the second follower 16 is rotated by forward / reverse rotation of the operation shaft 15.
The supply gas amount is increased or decreased by rotating the taper plug forward or reverse through 2.

The controller 13 receives not only the signal from the flame detecting element 12 but also the temperature sensor 3a.
And a signal from the mode selector 8 are also input. An electric motor 18 controlled by the controller 13 is mounted on a bracket 9d fixed to the base plate 9c. The heating power of the burner 3 can be adjusted, and the heating power of the standard burner 3 can be controlled according to the control mode selected by the mode selection unit 8.

In more detail, the controller 13 is activated when the standard burner 3 is ignited by manual operation of the operation shaft 15, and after the ignition, the fry button 8a of the mode selection section 8 is pressed. Then, the heating power is automatically adjusted via the electric motor 18 so that the temperature detected by the temperature sensor 3a is maintained at the set temperature. The set temperature is the fry button 8a.
It changes step by step each time you press.

When the rice cooker button 8b is pressed, the electric motor 18 is driven so that a medium heat suitable for rice cooker is obtained.
Is controlled, and when the temperature detected by the temperature sensor 3a rises to the rice cooking completion temperature, the operation shaft 1 is controlled via the electric motor 18.
5 is returned to the fire extinguishing position.

When the water heater button 8c is pressed, the heating power is reduced to low heat via the electric motor 18 when the temperature detected by the temperature sensor 3a rises to 100 ° C.

A movable element 19a of an encoder 19 for detecting a rotation angle is connected to the operation shaft 15, and a signal from the encoder 19 is input to the controller 13, and the electric motor 18 moves the operation shaft 15 to a required angular position. So that it can rotate.

The output torque of the electric motor 18 is
0 to the operating shaft 15.
The speed reduction mechanism 20 includes a drive gear 20 on an output shaft of the electric motor.
0, the driven gear 201 meshing therewith, and the driven gear 20
1 and a worm wheel 203 on the operating shaft 15 that meshes with the worm 202. The use of the worm 202 has the advantage that the reduction ratio can be increased without increasing the size of the reduction mechanism 20, but the rotation of the reduction mechanism 20 is restricted by the worm 202 when the electric motor 18 is not operating. The operation force required to manually rotate the operation shaft 15 becomes very large.

Therefore, in the present embodiment, a torque limiter mechanism 21 is interposed between the speed reduction mechanism 20 and the operation shaft 15,
Even if the rotation of the speed reduction mechanism 20 is restricted, the operation shaft 15 can be manually rotated with a small force due to the sliding of the torque limiter mechanism 21. The torque limiter mechanism 21 includes a tubular connecting member 210 that is extrapolated to the operation shaft 15 and a connecting member 2.
Presser spring 211 press-fitted to the outer periphery of
Worm wheel 2 extrapolated relative to 10
03, and a ring-shaped shoe member 212 pressed by a pressing spring 211. When the electric motor 18 is operated, the torque from the worm wheel 203 is applied to the shoe member 212, the pressing spring 211, and the connecting member 210. The transmission is transmitted to the operation shaft 15 via the control shaft 15. The limiter value of the transmittable torque is set to a value slightly higher than the rotational load of the operation shaft 15 by the biasing force of the presser spring 11, and the torque limiter mechanism 2 is driven by the electric motor 18.
The operation shaft 15 can be rotated without causing the slip at 1.
On the other hand, when the operation shaft 15 is manually rotated when the electric motor 18 is not operated, the shoe member 212 slides on the worm wheel 203, the rotation of which is restricted by the worm 202, and the operation shaft 15 does not receive the rotation restriction force of the worm 202. 15 can be rotated with a light force.

The shaft hole 210a of the connecting member 210 is
The operation shaft 15 to be inserted therein is formed to have a cross-sectional shape wider than the D-shaped cross-section 15b of the operation shaft 15, and the connection member 210 is connected to the operation shaft 15 with a play at a predetermined angle α. The angle α
, The engaging portion 161a is set to an angle equal extent necessary to overcome a step 162a ₃ of the guide groove 162a. Thus, when the normal rotation operation of the operation shaft 15 is released at the ignition position, even if the rotation restricting force by the worm 202 is acting on the connecting member 210 via the torque limiter mechanism 21, the operation shaft 15 does not release the restricting force. Without being received, it is surely reversed by a predetermined angle α, and the engaging portion 161a is
2a width moves to the narrow portion 162a ₂ of the pressing of the safety valve 10 by the rod 14 is reliably released.

The embodiment in which the torque limiter mechanism 21 is interposed between the speed reduction mechanism 20 and the operation shaft 15 has been described above. However, as in the embodiment shown in FIG.
A clutch mechanism 22 may be provided between the control shaft 15 and the operation shaft 15. The clutch mechanism 22 includes, for example, the worm wheel 2
03, which is constituted by an electromagnetic clutch having an outer 22a connected to the operating shaft 03 and an inner 22b connected to the operation shaft 15, and which is connected by the controller 13 when the electric motor 18 is operated to operate the torque from the speed reduction mechanism 20. Axis 1
5 when the electric motor 18 is not operated. Thus, the operation shaft 15 can be manually rotated with a small force without receiving the rotation restraining force by the worm 202. When the clutch mechanism 22 is disconnected, the operation shaft 15 is moved to the speed reduction mechanism 20.
Therefore, it is not necessary to provide the above-described play at the connection portion of the clutch mechanism 22 to the operation shaft 15.

The use of the clutch mechanism 22 increases the cost, and the use of the torque limiter mechanism 21 is more advantageous in terms of cost.

[0038]

As is apparent from the above description, according to the present invention, it is possible to obtain a manual and electric hybrid type rotary gas valve device, and to use a speed reduction mechanism including a worm to enlarge the speed reduction mechanism. The operating shaft can be rotated by a small-sized electric motor by increasing the reduction ratio without shaping, and the operating shaft can be manually rotated with a small force, so that the manual operability of the operating shaft is not impaired.

[Brief description of the drawings]

FIG. 1 is a perspective view of a stove incorporating a gas valve device of the present invention.

FIG. 2 is a longitudinal sectional view of the first embodiment of the gas valve device of the present invention.

3A is a longitudinal sectional view showing a state when the operating shaft is normally rotated to an ignition position, and FIG. 3B is a longitudinal sectional view showing a state when the normal rotation operation of the operating shaft is canceled at the ignition position.

FIG. 4 is an exploded perspective view of a main part of the first embodiment.

FIG. 5 is an expanded view of a cam groove formed in the cam.

FIG. 6 is a view showing a guide groove formed in a second follower.

FIG. 7 is a longitudinal sectional view of a second embodiment of the gas valve device of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 9 valve casing 10 safety valve 11 flow control valve 14 rod 15 operating shaft 16 cam mechanism 18 electric motor 20 reduction mechanism 202 worm 21 torque limiter mechanism 210 connecting member 22 clutch mechanism

Claims (3)

[Claims] 1. A rotary gas valve device in which a flow control valve for increasing or decreasing the amount of gas supplied to a burner is provided in a valve casing, and the flow control valve is operated by rotation of an operation shaft. And a torque limiter mechanism interposed between the speed reduction mechanism and the operation shaft. 2. A rotary gas valve device in which a flow control valve for increasing or decreasing the amount of gas supplied to a burner is provided in a valve casing, and the flow control valve is operated by rotation of an operation shaft. And a clutch mechanism that is disengaged when the electric motor is inoperative, is interposed between the speed reduction mechanism and the operation shaft. Gas valve device. 3. The rotary gas valve device according to claim 1, wherein a safety valve and a rod facing the safety valve are provided in the valve casing, and the operation shaft is extinguished by a cam mechanism linked to the operation shaft. The rod is advanced to the safety valve side against the return spring by the forward rotation from the position to the ignition position to push the safety valve open, and the return spring is attached when the normal rotation operation of the operation shaft is released at the ignition position. The rod is retracted while the operating shaft is reversed by a predetermined angle by the force to release the pressure of the safety valve, and the connecting member for the operating shaft of the torque limiter mechanism is connected to the operating shaft so as to have a play of the predetermined angle. A rotary gas valve device.