JPH09100942A - Rotationally operated type gas valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lock an operating shaft in an extinguishing position without using special parts and obtain stopper function to pressing operation for lock release in a rotationally operated type gas valve device performing opening/closing operation by rotating the operating shaft normally and reversely between the extinguishing position and an ignition position. SOLUTION: A recessed part 10h is formed at the hole edge of an axial hole 10e of a shaft guide 10 for supporting an operating shaft 6 in an inserted state. A flange 6b having a rotation stop protruding part 6a at the periphery, and a first protrusion 6d fitted into the recessed part 10h from the front in an extinguishing position are integrally formed at the operating shaft 6. A second protrusion 6e of size enough to pass through the recessed part 10h in such a phase as not to coincide with the recessed part 10h in a rotating angle range between the extinguishing position and an ignition position regulated by a stopper part 10g and a stopper part 10f provided at the shaft guide is integrally formed at a part of the operating shaft 6 protruded backward of the shaft guide 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a rotary operation type gas valve device used in a gas appliance such as a gas table.

[0002]

2. Description of the Related Art Conventionally, a rotary operation type is provided which has an operation shaft inserted and supported by a shaft guide attached to an end portion of a valve casing, and which is opened and closed by reversing the operation shaft between a fire extinguishing position and an ignition position. A gas valve device is known, in which the operating shaft is locked in the fire extinguishing position and locked by a pushing operation against the spring of the operating shaft so that the operating shaft does not rotate carelessly from the fire extinguishing position. It is also known to solve. In this case, conventionally, a guide tube formed with an L-shaped guide groove having a longitudinal groove portion that is long in the front-rear direction and a lateral groove portion that extends in the circumferential direction from the front end of the longitudinal groove portion with the pushing direction of the operating shaft as the front. On the valve casing, engage the cross pin attached to the operation shaft with the guide groove, and at the fire extinguishing position, the cross pin engages with the vertical groove of the guide groove to prevent the operation shaft from rotating, and the operation shaft cannot be pushed. Generally, the cross pin moves to the lateral groove portion of the guide groove to allow the normal rotation of the ignition position.

[0003]

In the conventional example described above, the guide groove can be used for locking at the fire extinguishing position and for restricting the pushing stroke, but a guide tube and a cross pin are required, and the number of parts is reduced. However, there is a problem that the cost increases. In view of the above points, the present invention is an apparatus capable of locking an operating shaft at a fire extinguishing position and restricting a pushing stroke of the operating shaft without using special parts such as a guide tube and a cross pin. The challenge is to provide.

[0004]

Means for Solving the Problems In order to solve the above problems,
In the present invention, the rotary operation type gas valve device is provided with an operation shaft which is inserted and supported by a shaft guide attached to an end portion of the valve casing, and which is opened and closed by forward and reverse rotation of the operation shaft between a fire extinguishing position and an ignition position. In the case where the operation shaft is locked in the fire extinguishing position and the lock is released by the pushing operation against the spring of the operation shaft, the hole edge of the shaft hole formed for inserting the operation shaft into the shaft guide. A recessed portion is formed in the operation shaft, and the operation shaft is pushed in the front direction, the operation shaft is provided with a flange for preventing the operation shaft from slipping backward relative to the shaft guide, and the recessed portion is fitted from the front in the fire extinguishing position. The protrusion is located at a portion of the operation shaft that protrudes rearward of the shaft guide, and is large enough to pass through the recessed portion in a phase that does not match the recessed portion in the angular range between the fire extinguishing position and the ignition position. The second protrusion of the sauna is formed integrally To have.

According to this, at the fire extinguishing position of the operating shaft, the first projection fits into the recessed portion, and at this time, the rearward biasing force of the spring is received by the shaft guide via the flange, so that the first The projection does not penetrate the recessed portion, and the operating shaft is securely locked in the fire extinguishing position. Then, when the operation shaft is pushed forward against the spring, the first projection comes out in front of the recessed portion to release the lock of the operation shaft, so that the operation shaft can be normally rotated from the fire extinguishing position to the ignition position. become. At this time, the second protrusion does not come into contact with the shaft guide from the rear side, the pushing stroke of the operating shaft is restricted, and there is no problem that a member inside the valve casing is overloaded due to excessive retraction of the operating shaft.

At the time of assembly, the operation shaft is inserted from the front into the shaft hole of the shaft guide, and the second protrusion is positioned behind the shaft guide through the recessed portion. After the assembly, the operation shaft is at the fire extinguishing position and the ignition position. Since the second protrusion does not coincide with the recessed portion, the stopper function against the pushing operation of the operating shaft can be reliably exhibited.

As described above, according to the present invention, it is possible to lock the operating shaft at the fire extinguishing position and regulate the pushing stroke of the operating shaft only by the operating shaft and the shaft guide that inserts and supports the operating shaft. It is possible to reduce the number of parts and reduce costs.

Conventionally, the operating shaft is formed by cold forging, but by cold forging, the flange or the first and second flanges as in the present invention are formed.
It is difficult to form the protrusions, so that the operation shaft is generally formed by die casting. The operating shaft may be made of a resin molded product. By the way, it is possible to restrict the rotation range of the operating shaft between the fire extinguishing position and the ignition position by restricting the rotation of the rotary member in the valve casing connected to the operation shaft. Since the shaft is twisted over its entire length by the rotational force input thereto, it is necessary to increase the strength of the operating shaft against torsion. However, it is difficult to secure the torsional strength with a die-cast or resin-made operating shaft.Therefore, the shaft guide regulates the rotation range of the operating shaft, and the rotational force input part and the rotation restricting part with respect to the operating shaft are regulated. It is desirable to reduce the axial distance between.

Conventionally, a shaft guide and a base plate are provided so that the operating shaft can be stably supported over the span in the axial direction.
It is known that a base plate is constituted by a guide plate assembled via a leg portion extending forward, and an operation shaft is inserted into a shaft hole formed in the base plate and the guide plate. In such a shaft guide, the recessed portion is formed at the hole edge of the axial hole of the guide plate, and the flange and the first protrusion are formed at a portion located between the base plate and the guide plate, A stopper portion for a fire extinguishing position and a stopper for an ignition position, which forms a protrusion protruding outward of the flange and restricts the rotation range of the operating shaft between the fire extinguishing position and the ignition position in cooperation with the protrusion. If both of these parts are formed on the base plate, or if one of both stopper parts is formed on the base plate and the other is formed on the guide plate, it will not be impossible even if it is a die-cast or resin operation shaft. . Further, in this type, when the operation shaft is inserted from the front into the shaft hole of the guide plate, the stopper portion formed on the base plate does not regulate the rotation, so that the rotational position beyond the position regulated by the stopper portion is not provided. The second protrusion can be located behind it through the recess. afterwards,
If the guide plate and the base plate are combined, the rotation range of the operation shaft is restricted between the fire extinguishing position and the ignition position by both the fire extinguishing position stopper and the ignition position stopper. The operating shaft is prevented from slipping out in both front and rear directions with respect to the shaft guide by the second protrusion and the flange. Thus, the operation shaft and the shaft guide can be sub-assembled as one unit, and the workability of the assembling work is improved.

When the base plate is provided with both the fire extinguishing position stopper and the ignition position stopper, rotation of the operating shaft cannot be regulated in either forward or reverse directions until the guide plate and the base plate are combined. Therefore, when the guide plate and the base plate are combined, it is necessary to rotate the operation shaft so that the protrusion formed on the operation shaft enters between the stopper portions, which deteriorates workability. On the other hand, if both stopper portions are separately provided on the base plate and the guide plate, the base plate and the guide plate can be easily combined with each other while the protrusion is in contact with the stopper portion formed on the guide plate. Therefore, the workability is improved.
In particular, if the stopper portion formed on the guide plate is used as a stopper portion for the fire extinguishing position, the first stopper is used as a guide.
The base plate and the guide plate can be combined in a state where the projection is fitted in the recessed portion and the operation shaft is stopped from rotating, and workability is further improved.

In the embodiment described later, a safety valve, a flow rate adjusting valve including a needle valve, a pilot valve, and a rod that can be moved back and forth are provided in the valve casing, and the valve body of the flow rate adjusting valve and the pilot valve are provided. The valve body and the valve body are integrally molded with the rod, and the rod is advanced through the cam mechanism by forward rotation of the operating shaft from the fire extinguishing position to the ignition position, pressing the safety valve and opening the pilot valve for ignition. Although the flow rate adjustment valve is throttled by reversing from the position to adjust the thermal power,
The present invention can be applied to a gas valve having a taper plug that rotates in conjunction with an operation shaft as a flow rate adjusting valve, and also to a gas valve without a pilot valve or a safety valve.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a valve casing which is long in the front-rear direction (the right side in FIG. 1 is the front), and a safety valve 2 is provided in the casing 1 in order from the front.
, A flow rate adjusting valve 3 and a pilot valve 4 are provided, and a gas flowing in from an inlet 1a opened on the outer peripheral surface of the front part of the valve casing 1 is passed through the safety valve 2 and the flow rate adjusting valve 3 to the middle of the valve casing 1. The amount of gas supplied to the main burner (not shown) connected to the main outlet 1b through the pilot valve 1 to the main outlet 1b opened on the outer peripheral surface of the part and to the pilot outlet 1c opened behind the main outlet 1b. Is adjusted by the flow rate adjusting valve 3 so that the gas supply to the pilot burner (not shown) connected to the pilot outlet 1c is cut off by the pilot valve 4.

The safety valve 2 includes an electromagnet 2b housed in a magnet case 2a, which is excited by an output of a thermocouple (not shown) for detecting a flame of a burner, and an adsorption piece 2 facing the electromagnet 2b.
c and a valve element 2f which is connected to the suction piece 2c through a valve rod 2d and is urged to the rearward closing side by a spring 2e. Further, a rod 5 which is movable back and forth is provided in the valve casing 1, and an operation shaft 6 which can be rotated forward and backward between a fire extinguishing position and an ignition position is provided at a rear end portion of the valve casing 1.
And a cam mechanism 7 for converting the rotation of the operating shaft 6 into the forward / backward movement of the rod 5, and the rod 5 is returned from the backward end position to the forward end position by forward rotation of the operating shaft 6 from the fire extinguishing position to the ignition position. 5a is advanced and the safety valve 2 is pressed and opened by the contact of the rod 5 with the valve body 2f. When the safety valve 2 is pressed and opened, the adsorption piece 2c comes into contact with the electromagnet 2b, and when the burner is ignited in this state, the adsorption piece 2c is generated by the output of the thermocouple.
c is attracted to the electromagnet 2b, and the safety valve 2 is held in the open state. In the figure, 2g is a socket for the electromagnet 2b.

A front chamber 1d for accommodating the safety valve 2 and a rear chamber 1e for accommodating the cam mechanism 7 are formed in the valve casing 1, and further, between the front chamber 1d and the rear chamber 1e.
A valve hole 3a for the flow rate adjusting valve 3 communicating with the front chamber 1d and a valve hole 4a for the pilot valve 4 communicating with the valve hole 3a are formed, and the rod 5 is inserted through these valve holes 3a, 4a. ing.

The flow rate adjusting valve 3 can be inserted into the valve hole 3a,
It is composed of a needle valve having a tapered valve body 3b that expands in diameter toward the front. The valve body 3b is integrally molded with the rod 5, and the rod 5 retracts from the intermediate position shown in FIG. 2 (B). At this time, the valve body 3b is inserted into the valve hole 3a so that the supply gas amount is throttled according to the insertion depth, and the large diameter valve body 3c made of an elastic body such as rubber is provided on the front side of the valve body 3b.
So that when the rod 5 is retracted to the retracted end position shown in FIG. 1, the valve body 3c is seated on the opening surface of the valve hole 3a to close the valve hole 3c and shut off the gas supply to the burner. did.

In the rotary operation type gas valve device, a taper plug which is rotated by an operation shaft is generally used as a flow rate adjusting valve, but according to the present embodiment, the rod 5 for pressing and opening the safety valve 2 is used. Since the flow rate adjusting valve 3 can be integrated with the above, the number of parts can be reduced and the cost can be reduced, which is advantageous.

The pilot valve 4 is composed of a spool valve having a valve body 4b consisting of a small diameter portion formed at the rear portion of the rod 5 and a large diameter portion in front of and behind the rod 5, and a pair of front and rear O-rings are provided in the valve hole 4a. When the rod 4 is advanced to the forward end position shown in FIG. 2 (A) when the spacers 4c and 4d are installed with the spacer 4e interposed therebetween, the small diameter portion of the valve body 4b is the O-ring 4 on the front side.
c, the pilot valve 4 is opened, the rod 5
As shown in FIG. 2 (B), the large diameter portion of the front side of the valve element 4b is tightly fitted to the O-ring 4c when the vehicle retracts from the forward end position so that the pilot valve 4 is closed. When the pilot valve 4 is opened, the rear large diameter portion of the valve body 4b is fitted into the rear O-ring 4d to prevent gas leakage to the rear of the valve hole 4a.

A first inner case 8 which can be inserted into and removed from the front chamber 1d of the valve casing 1 and a second inner case 8 which can be inserted into and removed from the rear chamber 1e.
An inner case 9 is provided, and the safety valve 2, the rod 5 and the return spring 5a are assembled to the first inner case 8 to form a valve unit, and the second inner case 9 has a cam mechanism 7 which will be described in detail later. A cam mechanism unit was constructed by housing the parts. According to this, it is possible to assemble the gas valve device by assembling the valve unit and the cam mechanism unit, which are sub-assembled in advance, to the valve casing 1, and it is possible to divide the assembling work and improve workability. In addition, since it is possible to inspect each unit for the presence or absence of an abnormality before assembling to the valve casing 1, it is possible to reduce the occurrence rate of defective products in the final inspection process and improve the productivity.

The first inner case 8 is made of resin, and the safety valve 2
A valve seat 2h on which the valve body 2f is seated, and a ring-shaped rod guide 8a located behind the valve seat 2h, which is connected to the valve seat 2h via legs 8b at a plurality of peripheral portions, are integrally formed. There is. Then, the safety valve 2 is inserted into the first inner case 8 from the front, and the engagement hole 8c formed in the front end portion of the first inner case 8 is inserted.
The safety valve 2 is prevented from coming off by engaging a claw portion 2i protruding from the outer peripheral surface of the magnet case 2a of the safety valve 2 with the shoulder portion of the first inner case 8 formed by the rear end surface of the valve seat 2h. ,
The collar 5c formed at the front end of the rod 5 is pushed into the rod guide 8a while the return spring 5a is provided between the spring receiver 5b formed also on the rod 5 and also serving as a retainer for the valve body 3c. I'm holding it. The first inner case 8
An opening 8d that matches the inlet 1a of the valve casing 1 is formed on the peripheral wall of the valve casing 1. When the safety valve 2 is opened, the opening 1d is opened from the inlet 1a to the inside of the first inner case 8 and to the valve seat 2h. Gas is allowed to flow to the flow rate adjusting valve 3 via. In the figure, 8e is a claw portion formed on the first inner case 8, and the claw portion 8e is engaged with the opening edge of the inlet 1a to prevent the opening 8d from being displaced from the inlet 1a. doing.

By the way, the distance between the rod 5 and the valve body 2f of the safety valve 2 in the fire extinguishing position (state of FIG. 1) depends on the dimensional tolerances of various parts such as the valve casing 1, the safety valve 2, the rod 5 and the cam mechanism 7. Since the accumulated error causes variations, the stroke of the rod 5 by the cam mechanism 7 is set to a long stroke, and the safety valve 2 is pressed and opened before the rod 5 reaches the forward push-off position by the cam mechanism 7, and Even if such variations occur, it is desirable to ensure that the adsorption piece 2c is pressed against the electromagnet 2b of the safety valve 2. In this case, it is necessary to prevent an unreasonable force from acting on the safety valve 2, the rod 5, and the cam mechanism 7 when the cam mechanism 7 advances after the safety valve 2 is pressed and opened. For this reason, conventionally, a washer that is pushed forward by a cam mechanism, which is retained by a stopper at the rear end of the rod and is pushed forward by a cam mechanism, is slidably externally attached to the rear of the rod, and the washer is attached to the rear by a return spring. When the cam mechanism is advanced after the safety valve is pressed and opened, the washer moves forward relative to the rod while compressing the second spring. However, the forward force of the cam mechanism is absorbed by the second spring. However, in this structure, the rod has to be inserted into the valve casing from the rear, and as in the present embodiment, the rod 5 is provided with the large-diameter valve body 3c, or the rod 5 and the safety valve 2 are unitized. Becomes difficult. Further, since the washer, the second spring and the snap ring for receiving the spring fitted to the rod are required, the number of parts is increased and the assembling is time-consuming and the cost is high. Further, when the rod is retracted from the forward end position by releasing the restraint of the rod by the cam mechanism, the rod is moved to the forward end position until the washer retracts due to the urging force of the return spring and contacts the stopper at the rear end of the rod. Remains in contact with the valve body of the safety valve, and the shock of the washer colliding with the stopper is transmitted to the valve body of the safety valve via the rod, and this shock releases the attraction of the attraction piece 2c to the electromagnet 2b. The safety valve 2 may close.

Therefore, in this embodiment, a cushion member 5d made of an elastic material such as rubber is attached to the front end of the rod 5, and the cushion member 5d is compressed when the cam mechanism 7 advances after the safety valve 2 is opened by pressing. I was made to do it. According to this, the advancing force of the cam mechanism 7 is absorbed by the cushion member 5d, an unreasonable force does not act on the safety valve 2, the rod 5, and the cam mechanism 7, and the number of parts is reduced to reduce the cost. Moreover, since there is no member such as the above washer that gives an impact to the rod 5 when the rod 5 retracts from the forward end position, the safety valve 2 can be prevented from being closed unnecessarily. The cushion member 5d may be attached to the rear end of the rod 5 or both front and rear ends of the rod 5. Further, although the cushion member 5d is formed in a cap shape in the present embodiment, it may be formed in a cylindrical shape.

As shown in FIG. 3, the cam mechanism 7 includes a cam 70 fixed to the valve casing 1 and an operating shaft 6.
A first follower 71, which is engaged with the rotation stopper so as to be movable back and forth,
A second follower 72 that engages with an engaging portion 71a provided on the first follower 71 in a guide groove 72a that is long in the front-rear direction, and that rotates forward and reverse with the forward and reverse rotation of the first follower 71. There is. Then, the rear end of the rod 5 is brought into contact with one of the first and second followers 71, 72, which is the first follower 71 in the present embodiment, to interlock with the back-and-forth movement of the first follower 71. The rod 5 is moved back and forth, and the second follower 72 is guided forward and backward by the cam 70 in its forward and reverse rotations.

To explain this in detail, in the present embodiment, the cam 70 is made of a resin-made cylindrical cam integral with the second inner case 9, and the resin-made cylindrical second cam inserted in the cam 70 is used. By providing a pin-shaped engaging portion 72b on the outer peripheral surface of the follower 72,
The engaging portion 72b is engaged with the spiral cam groove 70a as shown in FIG. 5 which is inclined forward in the forward direction formed on the cam 70, and the second follower 72 is forward and backward in the forward and backward directions. I try to move forward and backward. The cam 70 is formed with a vertical groove 70b extending rearward from an end of the cam groove 70a in the reverse direction, and when the second follower 72 is inserted into the cam 70 from the rear side, the engaging portion 72b has a vertical groove 70b. Through the cam groove 70a, and further, a thin groove lid portion 70c is provided on the outer periphery of the rear end portion of the vertical groove 70b, and the engaging portion 72b is provided with the vertical groove 70b.
When it is inserted into, the engaging portion 72b pushes the groove lid portion 70c radially outward by the wedge action of the inclined surface formed at the outer end of the engaging portion 72b and slips through the groove lid portion 70c. 2 The follower 72 is prevented from coming off.

Guide groove 72a formed in the second follower 72
, As shown in FIG. 6, the narrow portion 72a ₂ of the front wide portion 72a ₁ and the rear, forward of the stepped shape having a step 72a ₃ between the wide portion 72a ₁ and the narrow portion 72a ₂ Is formed on the second follower 72, and engages the guide portion 72a with an engaging portion 71a formed of a protrusion protruding from the outer peripheral surface of the resin-made cylindrical first engaging element 71 that is inserted into the second follower 72. The first follower 71 is formed with a blind hole-shaped shaft hole 71b having an irregular cross-sectional shape, and the front half of the operating shaft 6 formed in the irregular cross-sectional shape is inserted into the axial hole 71b, so that The follower 71 is slidably engaged with the detent. The guide groove 72a
The wide portion 72a ₁ of the first follower 71 is connected to the second follower 72.
Although it is extended to the front end of the second engaging element 72 so that the rod 5 can be inserted from the front side, the narrow portion 72a ₂ is arranged so as to restrict the backward movement of the rod 5 from the forward end position at the intermediate position. 2 The follower 72 ends at a position before the rear end.

The second inner case 9 which is integral with the cam 70 is formed into a bottomed cylindrical shape which opens rearward, and has a second follower 72.
When the first follower 71 is inserted into the cam 70, the bottom wall 9a at the front end of the second inner case 9 causes the first and second followers 71 and 72 to move into the second inner case. 9, the first follower 71 is retained rearward with respect to the second follower 72, and the second follower 72 is retained rearward with respect to the second inner case 9. The first and second followers 71, 72 are housed and held in the second inner case 9 while being prevented from slipping out in both front and rear directions, and a cam mechanism unit is configured.

On the outer peripheral surface of the second inner case 9, a pair of protrusions 9b, 9b are formed at two positions around the rear part thereof, and are formed at two positions around the rear chamber 1e of the valve casing 1. The recesses 1f, 1f are formed, and the protrusions 9a are formed in the recesses 1f.
The second inner case 9 is prevented from rotating with respect to the valve casing 1, and the cam 70 integrated with the second inner case 9 is fixed to the valve casing 1. Further, the through hole 9c is formed in the bottom wall portion 9a at the front end of the second inner case 9, and the rear end portion of the rod 5 is brought into contact with the front end surface of the first follower 71 through the through hole 9c. . A cam formed separately from the second inner case 9 can be housed and fixed, but in order to reduce the number of parts and reduce the cost, as in the present embodiment, the second inner case 9 can be used. Inner case 9
It is desirable that the cam 70 be integrally molded.

At the rear end of the valve casing 1, a shaft guide 10 for inserting and supporting the operating shaft 6 is attached. As shown in FIG. 3, the shaft guide 10 is composed of a base plate 10a and a guide plate 10b assembled to the base plate 10a via leg portions 10c at both ends extending forward, and the base plate 10a and the guide plate 10a. Shaft holes 10d and 10e, through which the operating shaft 6 is inserted, are formed in the shaft 10b, respectively, so that the operating shaft 6 can be stably supported with a span in the front-rear direction that is the axial direction thereof. Further, the base plate 10a and the guide plate 10b are provided with stopper portions 10f and 10g extending rearward and forward, respectively, and a fan-shaped outer peripheral portion of an intermediate portion of the operation shaft 6 located between the base plate 10a and the guide plate 10b. A fire extinguishing position shown in FIG. 4 (A) in which the flange 6b having the projection 6a is formed and the fan-shaped projection 6a abuts on the stopper 10g, and the fan-shaped projection 6a abuts on the stopper 10f.
The operating shaft 6 is made to rotate forward and backward between the ignition position shown in FIG.

The base plate 10a has a piezoelectric element 11a and
A piezoelectric ignition unit 11 including a hammer 11b and a drive plate 11c is provided, and when the operating shaft 6 is normally rotated from the fire extinguishing position, the hammer 11b is retracted through the drive plate 11c against the spring 11d, Drive plate 11c at ignition position
Was released from the hammer 11b and the piezoelectric element 11a was hit by the hammer 11b, and the burner was ignited via the pilot burner by the spark from the ignition electrode (not shown) connected to the piezoelectric element 11a. The drive plate 11c is urged forward by a spring 6c provided between the drive shaft 11c and the flange 6b of the operation shaft 6, and when the operation shaft 6 is reversed to the fire extinguishing position,
The hammer 6b is overcome against the biasing force of the spring 6c to return to the position shown in FIG. 5 (A).

Further, the operation shaft 6 is formed with two first protrusions 6d, 6d located on the rear surface of the flange 6b, and the operation shaft 6 is provided in the shaft hole 10e of the guide plate 10b. At the fire extinguishing position, the pair of recessed portions 10h, 10h are located at the hole edge portion where both the first projections 6d, 6d coincide with each other.
When the operating shaft 6 is returned to the fire extinguishing position, each first projection 6d is fitted into each recess 10h by the backward biasing force of the spring 6c, and the operating shaft 6 is engaged in the fire extinguishing position. Therefore, when the operating shaft 6 is normally rotated from the fire extinguishing position to the ignition position, it is necessary to push the operating shaft 6. Then, the second protrusions 6e, 6e at two locations are formed on the portion of the operation shaft 6 projecting rearward of the guide plate 10b, and the pushing stroke of the operation shaft 6 is applied to the guide plate 10b by the second protrusions 6e, 6e. I made it possible to regulate by contact.

The guide plate 10b abuts the base plate 10a at a flange portion 10i curved at the front end of its leg portion 10c, and has an edge of the base plate 10a at a claw portion 10j curved at the outer end of the flange portion 10i. It engages with the notch 10k formed in the above, and is locked in a state of being positioned with respect to the base plate 10a.

When assembling the shaft unit consisting of the operating shaft 6 and the shaft guide 10, first, the rear half of the operating shaft 6 is inserted into the shaft hole 10e of the guide plate 10b from the front side, and the second projection 6e is recessed. Guide plate 10 through 10h
b to the rear side, and then the operating shaft 6 is attached to the fan-shaped protrusion 6a.
Reverse to the fire extinguishing position where
The first projection 6d is fitted in the recessed portion 10h to stop the operation shaft 6 from rotating. Here, the second projection 6e is formed with a slight phase difference in the normal rotation direction with respect to the first projection 6d, and at the fire extinguishing position, the second projection 6e is disengaged from the recessed portion 10h, and the operation shaft 6 is The guide plate 10b is prevented from coming off backward.

Next, the spring 6c and the drive plate 11c are externally attached to the front half of the operating shaft 6 in this order, and then the guide plate 10b is locked to the base plate 10a as described above to assemble the shaft unit. In this assembled state, the forward rotation of the operating shaft 6 is restricted at a predetermined ignition position by the stopper portion 10f bent on the base plate 10a, and this ignition position is a position where the second protrusion 6e matches the recessed portion 10h (first position). Since the two protrusions 6e are set in front of the position where the two protrusions 6e are inserted into the recessed portion 10h), the operation shaft 6 will not drop from the shaft guide 10 thereafter.

The operation shaft 6 is made of a die-cast product made of a metal such as a zinc alloy having a good bathing property, and the direction of the diameter line which coincides with one side edge of the fan-shaped projection 6a is the die-cutting direction. The first protrusion 6d is formed on the diameter line, and the second protrusion 6e is formed in parallel with the diameter line at a position slightly offset from the diameter line in the normal direction.

In this embodiment, the base plate 10a is formed with the ignition position stopper portion 10f and the guide plate 10b is formed with the fire extinguishing position stopper portion 10g. However, the base plate 10a is formed with the fire extinguishing position stopper portion. 10g, guide plate 10
You may form the stopper part 10f for ignition positions in b.
In this case, when assembling the operation shaft 6 to the guide plate 10b,
The second projection 6e is inserted into the recessed portion 10h in a phase in which the operation shaft 6 is offset in the reverse direction from the fire extinguishing position, but if the guide plate 10b is assembled to the base plate 10a, the operation shaft 6
Since the reverse rotation beyond the fire extinguishing position is blocked by the fire extinguishing position stopper portion 10g formed on the base plate 10a, the second protrusion 6e does not coincide with the recessed portion 10h, and the operation shaft 6 is not attached to the shaft guide 10. It is prevented from falling out. It is possible to form both stoppers 10f and 10g on the base plate 10a. In this case, however, rotation of the operating shaft 6 in both forward and reverse directions is restricted until the guide plate 10b is combined with the base plate 10a. It becomes impossible, and therefore the guide plate 10b
When the base plate 10a and the base plate 10a are combined, it is necessary to rotate the operation shaft 6 so that the fan-shaped projection 6a is inserted between the stoppers 10f and 10g, which deteriorates workability. On the other hand, if the stoppers 10f and 10g are separately provided on the base plate 10a and the guide plate 10b as described above, the fan-shaped projection 6a is brought into contact with the stopper formed on the guide plate 10b. Easily the base plate 10a and the guide plate 10b
And can be combined, which is advantageous. Particularly, if the stopper portion formed on the guide plate 10b is the stopper portion 10g for the fire extinguishing position as in this embodiment, the first protrusion 6d is recessed into the concave portion 10h using the stopper portion 10g as a guide as described above.
The base plate 1 with the operating shaft 6 stopped
0a and the guide plate 10b can be combined, and workability is further improved.

The second inner case 9 has the both protrusions 9
A pair of claw pieces 9d and 9d extending rearward from b and 9b are integrally formed, and the cam mechanism unit is provided with both claw pieces 9d and 9d.
In the above, the shaft guide 10 is engaged with the shaft guide 10 so that an operation unit including a cam mechanism unit and a shaft unit can be configured.

To explain this in detail, in this embodiment, a pair of transparent windows 1 located on both sides of the shaft hole 10d in the base plate 10a.
0l, 10l and the leg portions 10c at both ends of the guide plate 10b,
A pair of engaging holes 10m and 10m are formed in 10c, each claw piece 9d is engaged with each engaging hole 10m through each through window 101, and further, an engaging hole 10n is formed in the base plate 10a. ,
A projection 9e protruding from the rear end surface of the second inner case 9 was fitted into this. In this way, by engaging the claw piece 9d with the guide plate 10b, the guide plate 10b does not easily separate from the base plate 10a, and the handling of the operation unit after subassembly is facilitated.

In the operation unit, the second inner case 9 is inserted into the rear chamber 1e of the valve casing 1 and the base plate 1
0a and the guide plate 10b are fastened together with the rear end of the valve casing 1 at the joint of the flange portion 10i to the base plate 10a, so that the valve casing 1 is assembled, and then the knob 12 is attached to the operating shaft 6. Complete the assembly.

Next, the operation of the gas valve device of this embodiment will be described. When igniting the burner, first, the operating shaft 6
Is pushed to separate the first projection 6d from the recess 10h, and then the operating shaft 6 is normally rotated from the fire extinguishing position to the ignition position. Here, in the fire extinguishing position, the engaging portion 72 of the second follower 72
b is in the position of the cam groove 70a of the cam 70 shown in FIG. 5a, and the engaging portion 71a of the first follower 71 is in the position of the guide groove 72a of the second follower 72 shown in FIG. 6a. . When the operation shaft 6 is normally rotated from the fire extinguishing position, the engaging portion 71a moves to the position of the guide groove 72a shown by b in FIG. 6 and the wide portion 72a ₁
Of the first follower 71, the second follower 72 rotates in the forward direction through the first follower 71, and is guided by the cam groove 70a to the second follower 72.
The follower 72 moves forward. In this case, since the engaging portion 71a is engaged with the forward of the step 72a ₃ of the guide groove 72a, the first follower 71 is advanced along with the advancement of the second follower 72, the rod 5 is first driven Return spring 5 pushed by child 71
It moves forward from the backward end position against a. At the ignition position, the engaging portion 72b moves to the position of the cam groove 70a shown by b in FIG. 5, the rod 5 advances to the advance end position as shown in FIG. 2 (A), and the safety valve 2 is pressed and opened. At the same time, the pilot valve 4 is opened, and the piezoelectric ignition unit 11 is operated to ignite the burner.

After ignition, remove the hand from the knob 12 and operate the operation shaft 6
When the input of the rotational force in the normal rotation direction to the engaging portion 7 is stopped, the return force of the return spring 5a acting on the first follower 71 via the rod 5 causes the operating shaft 6 to slightly reverse and rotate.
1a goes over the step 72a ₃ and moves to the narrow portion 72a ₂ of the guide groove 72a, and the first follower 71 and the rod 5 retract. Then, when the engaging portion 71a moves to the position indicated by c in FIG. 6 and comes into contact with the rear end of the narrow portion 72a ₂ , further backward movement of the first follower 71 is prevented, and the forward end of the rod 5 is prevented. Retraction from the position is stopped at the intermediate position shown in FIG. At this intermediate position, the pressure of the safety valve 2 is released and the pilot valve 4 is closed, but the flow rate adjusting valve 3 is in the fully open state and the burner is maintained in the high-fire state.

When the operating shaft 6 is reversed from the ignition position, the first
The second follower 72 is reversely rotated via the follower 71, guided by the cam groove 70a, and the second follower 72 retracts from its forward end position, and following this retreat, the first follower 71 and the rod 5 are moved. And retract from the middle position. In this case, the flow control valve 3 throttles the amount of gas supplied to the burner, and the heating power of the burner is weakened. Then, the engaging portion 72b is connected to the cam groove 70.
When a is moved to a position indicated by c in FIG. 5, the large-diameter valve body 3c of the flow rate adjusting valve 3 is seated on the opening surface of the valve hole 3a, the flow rate adjusting valve 3 is closed, and the burner is extinguished. Thus, after ignition, the burner heat power can be adjusted by rotating the operating shaft 6 forward and backward in the angular range between b and c in FIG.

When the flow rate adjusting valve 3 is closed as described above, the rod 5 cannot move backward anymore, and therefore the closed position of the flow rate adjusting valve 3 becomes the retracted end position of the rod 5. In this case, before the rod 5 reaches the retracted end position, the first follower 7
When the retreat of 1 is blocked, the flow rate adjusting valve 3 cannot be closed. Therefore, when the engagement portion 72b is in the position of c in FIG. 5, it is set so that a slight gap is secured between the first follower 71 and the base plate 10a, and the operation shaft 6 is set to the extinguishing position. When moving the engaging portion 72b from the position c in FIG. 5 to the position a in the reverse direction, the first follower 71 is retracted by this gap to move the first follower 71 from the rear end of the rod 5 by the gap. Therefore, the flow control valve 3 can be prevented from being defectively closed due to dimensional tolerance.

When the first follower 71 comes into contact with the base plate 10a and is prevented from further retracting, thereafter, the second follower 7 is pressed.
Only 2 moves backward, the engaging portion 71a moves forward relative to the guide groove 72a, and when the operating shaft 6 is returned to the fire extinguishing position, the engaging portion 71a returns to the position indicated by a in FIG. .

By the way, the cam groove 70a is formed in the positions a and b in FIG.
However, in this case, the position of the cam groove 70a corresponding to the retracted end position of the rod 5 is displaced from c to c ′ in FIG. And c'are narrowed, making it difficult to fine-tune the heat power. Therefore, in the present embodiment, the ratio of the movement distance of the second follower 72 in the front-rear direction to the rotation angle of the operation shaft 6 is the position of the second follower 72 at the fire extinguishing position of the operation shaft 6 and the guide groove 72a from this position. The cam 70 is formed so as to be larger than the other range in the range between the position apart from the front by a length substantially equal to the length of the narrow portion 72a _{2 in} the front-rear direction, that is, in FIGS. The inclination angle of the portion of the cam groove 70a between the two is widened so that the angle range between b and c where the thermal power can be adjusted can be widened, and the fine adjustment of the thermal power can be facilitated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an example of the apparatus of the present invention.

2A is a vertical cross-sectional view showing a state when the operating shaft is normally rotated to an ignition position, and FIG. 2B is a vertical cross-sectional view showing a state when the operating shaft is free at the ignition position.

FIG. 3 is a perspective view of a disassembled state of a cam mechanism unit and a shaft unit.

4A is a sectional view taken along the line IV-IV of FIG. 1, and FIG. 4B is a sectional view corresponding to FIG. 4A at an ignition position.

FIG. 5 is a development view of a cam groove formed on the cam.

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

[Explanation of symbols]

 1 Valve Casing 6 Operation Shaft 6a Projection 6b Flange 6c Spring 6d First Protrusion 6e Second Protrusion 10 Shaft Guide 10a Base Plate 10b Guide Plate 10c Leg 10e Shaft Hole 10f Ignition Position Stopper 10g Fire Extinguishing Position Stopper 10h Recess Missing part

Claims (3)

[Claims] 1. A rotary operation type gas valve comprising an operation shaft which is inserted into and supported by a shaft guide attached to an end portion of a valve casing, and which is opened and closed by reversing the operation shaft between a fire extinguishing position and an ignition position. In a device in which the operating shaft is locked in the fire extinguishing position and the locking is released by a pushing operation against the spring of the operating shaft, the hole of the shaft hole formed for inserting the operating shaft into the shaft guide. A recessed part is formed on the edge, and the pressing direction of the operating shaft is forward, and the operating shaft has a flange for preventing the operating shaft from slipping backward with respect to the shaft guide. 1 protrusion and the part of the operation shaft that protrudes to the rear of the shaft guide,
In the angular range between the fire extinguishing position and the ignition position, the second portion having a size that can pass through the recessed portion in a phase that does not match the recessed portion.
A rotary operation type gas valve device characterized by being integrally formed with a protrusion. 2. The shaft guide is composed of a base plate and a guide plate assembled to the base plate via legs extending forward, and an operation shaft is provided in a shaft hole formed in the base plate and the guide plate. Inserted, forming the recessed portion at the hole edge of the shaft hole of the guide plate, in the portion located between the base plate and the guide plate,
The flange and the first protrusion are formed, and a protrusion protruding outward from the flange is formed, and the rotation range of the operation shaft is regulated in cooperation with the protrusion between the fire extinguishing position and the ignition position. 2. The fire extinguishing position stopper portion and the ignition position stopper portion are both formed on the base plate, or one of the two stopper portions is formed on the base plate and the other is formed on the guide plate. The rotary operation type gas valve device according to. 3. The rotary operation type gas valve device according to claim 2, wherein a stopper portion for ignition position is formed on the base plate, and a stopper portion for fire extinguishing position is formed on the guide plate.