JP5962920B2 - Gas cock - Google Patents

Description

  The present invention relates to a gas cock that adjusts the flow rate of gas supplied to gas by rotating an operation shaft.

  As this type of conventional gas cock, there is known a gas cock in which the end of an operation shaft is exposed to the outside and an operation knob or the like is attached so that the operation shaft can be rotated. A frustoconical closure is attached to the base end of the operating shaft. This closure is rotatably housed in a tapered hole-shaped accommodation hole, and the overlapping area between the gas passage hole formed on the circumferential surface of the closure and the gas passage hole formed on the circumferential surface of the accommodation hole is increased or decreased. Thus, the flow rate of the gas supplied to the gas burner through both gas passage holes is increased or decreased.

  A cam plate is attached to the operation shaft, the cam plate is rotated together with the operation shaft, a recess is provided on the upper surface of the cam plate, and a steel ball pressed against the upper surface of the cam plate by a spring plate is fitted in the recess. It is known that a feeling of clicking is generated during the turning operation of the operation shaft (see, for example, Patent Document 1).

JP 2012-184890 A (FIGS. 5 and 7 to 10)

  In the above-mentioned conventional one, since the spring plate that presses the steel ball against the upper surface of the cam plate has to be attached above the cam plate, the operation shaft becomes long and the vertical dimension of the gas cock itself becomes large. In addition, the assembly must be performed so that the steel balls do not fall off, and the assembly process becomes complicated, and there is a risk that the ratio of gas cocks becoming defective will increase as the steel balls flow down to the downstream of the assembly line. Occurs.

  In view of the above problems, an object of the present invention is to provide a gas cock that does not have a long operating shaft and can generate a click feeling without using a steel ball.

In order to solve the above problems, a gas cock according to the present invention is a gas cock that adjusts the flow rate of gas by rotating the operating shaft from the fully closed position over the heating power adjustment range. provided a micro switch which is turned on and off by the outer peripheral surface of the plate, in which detecting the rotational phase of the operation shaft by a micro switch, a cavity provided in the interior of the cam plate, provided with a recess on the inner surface of the cam plate, the wire wound in a circular, elastic parts engaging portion is projected in a part, positioned within the interior space of the cam plate, the engaging portions on the inner surface of the cam plate on the trajectory of the recess is pressed against It provided so as not to rotate with respect to the upper SL operating shaft in a state, click feeling was to occur during rotational operation of the control shaft by fit into recesses the resilient element is rotated together with the operating shaft And wherein the door.

  In the present invention, the elastic part housed in the internal space of the cam plate is configured to provide a click feeling by being fitted into a recess formed in the cam plate.

  When there is an operation region where misfire occurs in the gas burner within the heating power adjustment range, it is not desirable to stop the rotation of the operation shaft in the operation region. In such a case, the inner surface of the cam plate is formed on the locus of the concave portion with convex portions having inclined surfaces on both the left and right shoulders, and the elastic component is pushed onto the inclined surface continuous with the convex portions. It is possible to prevent the operation axis from stopping when in contact.

  As apparent from the above description, the present invention does not give a click feeling by fitting a steel ball into the recess, but has a configuration in which an elastic part fits into the recess provided in the cam plate. Adopted. Thereby, it is not necessary to assemble a small steel ball, so that the number of assembling steps can be reduced. Further, since the elastic part is provided in the internal space of the cam plate, the size of the operation shaft can be shortened.

The perspective view from one side of the gas cock by this invention Perspective view from the other side of the gas cock Exploded view of the gas cock Diagram showing details of cam The figure which shows the relationship between a spring, an up-and-down board, and an operation axis The figure explaining the rotation phase of an operation axis

  1 to 3, reference numeral 1 is an example of a gas cock according to the present invention. The gas cock 1 introduces a gas from an inflow port, branches the introduced gas into two systems, and causes the gas to flow out from two outflow ports 12 and 13. Reference numeral 8 denotes a parent-child burner, which is piped so that the gas flowing out from both the outlets 12, 13 is supplied to the parent burner 81 and the child burner 82, respectively.

  In the fire extinguishing state where the gas does not flow out from both the outlets 12 and 13, that is, when the main child burner 8 is ignited from the fully closed state, the operating shaft 2 is pushed downward and leftward while maintaining the pushed state. Rotate.

  An upper and lower plate 3 that moves up and down together with the operation shaft 2 is attached to the operation shaft 2. When the operation shaft 2 is pushed down, the upper and lower plate 3 moves downward to turn on the micro switch 72. Then, the controller (not shown) detects that the operating shaft 2 has been pushed in, and similarly activates the sparker (not shown) to generate intermittent spark discharge in the vicinity of the parent-child burner 8.

  On the operation shaft 2, a cam 5 that moves up and down together with the operation shaft 2 and rotates together with the operation shaft 2 is provided above the upper and lower plates 3. When the operating shaft 2 is rotated while the operating shaft 2 is pushed in, the cam 5 turns on the micro switch 71, and the controller can detect that the operating shaft 2 is rotated. Further, a closing member (not shown) is attached to the lower end of the operation shaft 2. When the operation shaft 2 is rotated, the closing member is also rotated, and the flow rate of the gas flowing out from the outlets 12 and 13 is gradually increased. The parent and child burner 8 is surely ignited at least until the opening degree of the closing member reaches the fully open position.

  Further, an electromagnetic safety valve is incorporated at a position indicated by reference numeral 14. When the upper and lower plates 3 move downward, the micro switch 72 is turned on and the projection 17a of the swing plate 17 is pushed down. The swing plate 17 is swingably held around the swing shaft 16, and when the projection 17a is pushed down, the swing plate 17 swings backward and pushes the rod 15 backward.

  When the rod 15 is pushed backward, the valve body of the electromagnetic safety valve is pressed against the electromagnet, and when ignition to the parent-child burner 8 is completed in this state, a holding current is supplied to the electromagnet and the valve body is adsorbed. It is configured as follows. Accordingly, when the ignition is completed and the operation shaft 2 is released from the operation shaft 2 and the operation shaft 2 returns upward, the electromagnetic safety valve continues to maintain the open state even if the swing plate 17 does not push the rod 15 backward. .

  Referring to FIG. 4, the outer peripheral surface of cam 5 is a cam surface 51 for turning on micro switch 71. The cam 5 is hollow, and two concave portions 52 and 53 and one convex portion 54 are formed on the inner peripheral surface.

  On the other hand, as shown in FIG. 5, a pair of cut-and-raised protrusions 31 are formed on the upper and lower plates 3, and a spring 4 wound in a circle, which is an elastic part, is engaged with the protrusions 31. . Both ends of the wire constituting the spring 4 are bent inward to form claws 41. The claw 41 is configured to engage with the protrusion 31 so that the spring 4 does not rotate with respect to the upper and lower plates 3. In addition, both the claws 41 may be bent downward, and a hole may be provided in the upper and lower plates 3 instead of the protrusions 31, and the rotation may be prevented by inserting the claws bent downward into the holes.

  Further, the engaging portion 42 is formed so as to protrude outward so as to engage with the concave portions 52 and 53, but when the concave portions 52 and 53 and the convex portion 54 are formed on the ceiling surface of the cam 5. The engaging portion 42 is formed by bending so as to stand upward.

  On the other hand, the upper and lower plates 3 move up and down together with the operation shaft 2 as described above, but when they move downward, the microswitch 72 must be turned on and the protrusion 17a must be pushed down. However, since the action point 34 for applying a pressing force to the microswitch 72 and the protrusion 17a is away from the operation shaft 2, if the back and forth plate 3 is loosely attached to the operation shaft 2, the upper and lower plates 3 Since the operating point 34 is inclined to escape upward, the rod 15 cannot be pushed backward sufficiently, and the micro switch 72 cannot be turned on. Therefore, the upper and lower plates 3 are fitted to the operation shaft 2 with almost no gap, and a groove 22 having a width dimension that allows the operation shaft 2 to rotate in the fitted state is formed. The large hole portion 32 through which the portion 21 can pass and the small hole portion 33 having a diameter close to the diameter of the bottom portion of the groove 22 are formed to communicate with each other, the operation shaft 2 is passed through the large hole portion 32, and then the small hole portion 33 is formed in the groove 22. The upper and lower plates 3 are attached to the operation shaft 2 without looseness. When the gas cock 1 is assembled, the bracket 6 restricts the horizontal movement of the upper and lower plates 3, so that the groove 22 does not move toward the large hole portion 32.

  Referring to FIG. 6, when ignition is performed from the fire extinguished state, that is, the fully closed state as described above, first, the operating shaft 2 is pushed downward (a). Then, the operating shaft 2 is rotated leftward while being pushed down (b). When the operation shaft 2 is rotated to the high fire position (fully open position), the engaging portion 42 of the spring 4 is fitted into the recess 52 to generate a click feeling, and the torque for rotating the operation shaft 2 increases. Therefore, the operator can know that the position is the fully open position. If the operation shaft 2 is pushed in and held for a certain period of time, the ignition of the parent-child burner 8 is completed, and the valve body of the electromagnetic safety valve is attracted to the electromagnet. If the hand is released in this state, the operating shaft 2 returns upward by the biasing force of a spring (not shown). If the operating shaft 2 is rotated during the period from the fully open state to the fully closed state (c), the heating power of the parent-child burner 8 increases or decreases.

  Next, when only the child burner 82 is in the combustion state, the operating shaft 2 is further rotated leftward beyond the fully opened position. In the range indicated by d, the heating power remains unchanged in both burners 81 and 82, but the operating shaft 2 is temporarily stopped when the engaging portion 42 is fitted into the next concave portion 53. When the operating shaft 2 is further rotated leftward, the heating power of only the parent burner 81 is reduced (e). However, in the range of e, there is a possibility that a reverse fire phenomenon occurs in the parent burner 81. I do not want to stop within the range of e. Therefore, a convex portion 54 is provided.

  The engaging portion 42 of the spring 4 is fitted in the concave portion 53 when shifting from d to e, but the engaging portion 42 must exceed the convex portion 54 in order to further rotate to the left. Therefore, a large torque is required to keep the operation shaft 2 rotating. If the vertex of the convex portion 54 is not exceeded, the operation shaft 2 returns to the right. However, if the convex portion 54 is exceeded, the torque suddenly decreases, so the manipulation shaft 2 is rotated to the range of f at a stroke. .

  At the time of entering the range of f, the parent burner 81 is extinguished and the child burner 82 is burning in a high fire state. By further turning left within the range of f, the heating power of the sub-burner 82 can be reduced to the minimum heating power. In order to extinguish the parent-child burner 8 from this state, the operation shaft 2 may be rotated rightward to the fire extinguishing position. In the middle of this, the vehicle overpasses the convex portion 54 again, and when it is further fitted into the concave portion 53, the parent burner 81 is ignited again. A click feeling is generated by sequentially fitting into the recesses 53 and 52.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Gas cock 2 Operating shaft 3 Upper / lower plate 4 Spring 5 Cam 6 Bracket 8 Parent-child burner 15 Rod 17 Oscillating plate 17a Protrusion 21 Shaft portion 22 Groove 32 Large hole portion 33 Small hole portion

Claims (2)

A gas cock that adjusts the gas flow rate by rotating the operation shaft from the fully closed position over the heating power adjustment range, and includes a cam plate that rotates together with the operation shaft and a micro switch that is turned on and off by the outer peripheral surface of the cam plate. The rotation phase of the operating shaft is detected by a micro switch. In the cam plate, a cavity is provided in the cam plate, a recess is provided in the inner surface of the cam plate, and a wire is wound in a circular shape. the resilient elements but which project, so as not to rotate with respect to the upper SL operating shaft in a state located in the inner space of the cam plate, the engaging portions on the inner surface of the cam plate on the trajectory of the recess is pressed against A gas cock is provided, wherein the elastic part is fitted into a recess that rotates together with the operation shaft so that a click feeling is generated during the rotation operation of the operation shaft.   On the inner surface of the cam plate, on the locus of the recess, a convex portion having inclined surfaces is formed on both left and right shoulders, and the operating shaft is in a state where the elastic part is pressed against the inclined surface continuing to the convex portion. The gas cock according to claim 1, wherein the gas cock is not stopped.

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