JP3837053B2 - Gas equipment thermal power control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thermal power adjusting device that adjusts the thermal power of a gas appliance such as a gas stove.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a gas appliance such as a gas stove, a thermal power adjusting device that adjusts the thermal power by adjusting the gas flow rate to the burner is provided. In this device, as shown in FIG. 7, the needle valve 41 provided in the gas flow path 15 is moved forward and backward to change the flow path area, and the gas supply pressure to the nozzle 31 is changed to change the gas flow rate. It is adjusting. Generally, it is known that the amount of gas ejected from the nozzle 31 is proportional to the square root of the nozzle internal pressure. Further, the primary air is sucked into the burner body 32 from the air inlet 34 formed around the nozzle 31 by the momentum of the gas ejected from the nozzle 31. The primary air ratio at this time is set so that good combustion can be maintained.
[0003]
The gas amount adjustment by the heating power adjustment device 140 will be described. A pin 50 is suspended from the side of the head of the needle valve 41. The pin 50 is loosely passed through a vertical guide hole 52 of a guide plate 51 provided at the base end portion of the heating power adjusting lever 106a. Further, a fixed guide plate 153 formed integrally with an attachment base plate 146 fixed to the gas pipe main body 12 is provided outside the guide plate 51. FIG. 8 shows an external view of the mounting base plate 146. An oblique guide hole 148 is opened in the fixed guide plate 153, and the pin 50 is loosely passed through the oblique guide hole 148. In FIG. 7, the fixed guide plate 153 is omitted, and only the oblique guide hole 148 is drawn with a dotted line.
Accordingly, the pin 50 of the needle valve 41 is pushed and the oblique guide hole 148 is operated by operating the operation lever 61a connected to the heating power adjustment lever 106a provided so as to swing around the axis of the needle valve 41 to the left and right. The gas flow rate is adjusted by sliding the inside and changing the vertical position of the needle valve 41 itself.
[0004]
[Problems to be solved by the invention]
However, in such a thermal power adjusting device 140, the operating force of the throttle operation via the thermal power control lever 106a is directly transmitted to the needle valve 41. Therefore, when the throttle operation is performed rapidly, the needle valve 41 also rapidly moves downward. The gas flow rate is suddenly reduced. As a result, the decrease in the air suction amount in the burner could not catch up, and the balance of the primary air ratio could be lost, causing problems such as fire extinguishing.
[0005]
Therefore, as shown in FIG. 9, by providing a step at an intermediate position of the operation guide frame of the operation lever connected to the thermal power control lever, and stopping the thermal power control lever in the process of operating from a high fire to a low fire, There are also known gas stoves that prevent a drastic decrease in gas. However, with such a gas stove, the thermal power adjustment lever cannot be operated smoothly due to this level difference, so the feeling of use is bad, and even if you think that you operated from a high fire to a low fire when you are operating gently, A malfunction such as that could have occurred.
The thermal power control apparatus of the present invention solves the above-described problems, and aims to be safe to use without causing problems such as fire extinguishing even when a rapid throttle operation is performed.
[0006]
[Means for Solving the Problems]
A thermal power control apparatus for a gas appliance according to claim 1 of the present invention for solving the above-described problem is provided.
In a thermal power control apparatus for a gas device that adjusts the amount of gas by moving a needle valve provided in a gas flow path forward and backward through a manual operation device,
A spring for urging the needle valve in the throttle direction;
An adhesive grease that provides resistance to the forward and backward movement of the needle valve;
Moving means for moving the needle valve in the opening direction by the operating force of the manual operating device;
The moving means has a pin suspended from the needle valve, a first guide plate having a first guide hole through which the pin can be moved forward and backward, and a second guide hole through which the pin is inserted. A second guide plate that changes a relative position of the first guide plate in a direction substantially perpendicular to the advancing / retreating direction of the needle valve when the manual operation device is operated,
The second guide hole is formed with a tapered portion that forms an inclined opening edge that guides the pin so that the needle valve is in an opening direction with respect to a movement of the manual operating device in a strong fire direction. The gist is that an opening region is formed in which the pin abutting on the tapered portion can be moved as it is in a direction substantially perpendicular to the advancing / retreating direction of the needle valve as the operating device moves in the low-fire direction.
[0007]
Moreover, the thermal power control apparatus for gas equipment according to claim 2 of the present invention is the thermal power control apparatus for gas equipment according to claim 1,
The gist of the invention is that there is provided a restricting means for preventing the needle valve from moving with respect to the urging force of the spring in the throttle direction when the pin is in contact with the tapered portion.
[0008]
In the thermal power control apparatus for a gas appliance according to claim 1 of the present invention having the above-described configuration, when the manual operation device is operated, the relative position of the first guide plate and the second guide plate in the direction substantially perpendicular to the advancing / retreating direction of the needle valve The needle valve pin inserted through the first guide hole and the second guide hole moves. At this time, when the manual operation device is operated in the strong fire direction, the pin moves along the tapered portion formed in the second guide hole, so that the needle valve also moves in the opening direction to widen the gas flow path and become a strong heat power.
On the other hand, when the manual operating device is suddenly operated in the low heat direction, the pin that contacts the tapered portion moves in the opening area of the second guide hole in the direction substantially perpendicular to the advancing / retreating direction of the needle valve. The advance / retreat position does not change. Since the needle valve is urged in the throttle direction by the spring, the needle valve moves slowly in the throttle direction due to the balance between the restoring force of the spring and the resistance of the adhesive grease, and a low heat is generated. In other words, even if the manual operation device is quickly squeezed, the needle valve moves only slowly, and the ratio of the reduction in the amount of gas ejected from the nozzle and the reduction in the amount of primary air that is sucked is lost. To prevent problems such as fire extinguishing.
[0009]
According to a second aspect of the present invention, there is provided a thermal power control apparatus for a gas appliance in which, in a state where the pin is in contact with the taper portion, the regulating means moves the needle valve by the biasing force in the throttle direction by the spring. Ban. That is, the needle valve does not move in the throttle direction unless the manual operation device is operated in the throttle direction to release the contact state between the pin and the tapered portion.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of a thermal power control apparatus for a gas appliance according to the present invention will be described below with reference to FIGS.
[0011]
FIG. 5 is an external view of a gas stove provided with a thermal power control apparatus for a gas cooking appliance according to the present embodiment.
The gas stove 1 is provided with two sets of stove burners 30a and 30b on the top plate 2, and a cooking pot (not shown) is placed on the virtues 4a and 4b provided around them, and provided on the front of the gas stove 1 By pressing the operation buttons 5a and 5b, the stove burners 30a and 30b are ignited, and the cooking pan is heated. The heating power of the stove burners 30a and 30b is adjusted by operating the operating levers 61a and 61b connected to the heating power adjusting levers 6a and 6b to the left and right.
At the center of the vessel between the stove burners 30a and 30b, a grill 7 for grilling a food such as fish is provided, and the operation button 5c is pressed to ignite and heat cooking is performed. The heating power of the grill 7 is adjusted by operating the operation lever 61c connected to the heating power adjusting lever 6c to the left and right.
[0012]
A schematic diagram of the gas stove 1 is shown in FIG.
The gas stove 1 includes an operation button 5a, a swing member 11 that is swung by the operation button 5a, and a spindle 13 in the gas flow path 15 that is pushed by the swing member 11 and slides in the right direction in the drawing. , A main valve 16 that is fixed to the spindle 13 and opens and closes the gas flow path 15 by operating the operation button 5a, and also opens the gas flow path 15 by ignition operation and is kept open only during combustion. A magnet valve 17, a thermal power control device 40 (described later) provided with a needle valve 41 that moves up and down in conjunction with the operation of the thermal power control lever 6 a and adjusts the gas flow rate according to its position, and the gas and combustion adjusted in flow rate A stove burner 30a that mixes and burns with commercial air is provided. The stove burner 30a includes a nozzle 31, a burner main body 32 into which a gas jetted from the nozzle 31 and a mixed gas composed of primary air sucked at that time, and a burner main body 32 mounted on the burner main body 32. The burner body 33 is provided with an intake port 34 for sucking primary air. Further, a thermocouple (not shown) that generates an electromotive force for holding the magnet valve 17 in the open state during combustion, an igniter 18 that generates a high-voltage pulse voltage in response to the operation of the operation button 5a, and ignition by the operation of the igniter 18 And an electrode 19 for performing pulse discharge and a dry battery 20 for supplying power to the igniter 18.
[0013]
Next, the thermal power control device 40 will be described in detail.
As shown in FIGS. 1 to 3, the thermal power adjusting device 40 includes a thermal power adjusting lever 6 a, a needle valve 41 that is provided in the gas flow path 15 and moves up and down to adjust the gas flow rate according to its position, And a coil spring 43 that urges the needle valve 41 in the throttle direction (downward in the figure). The thermal power control device 40 increases the gas flow path area when the needle valve 41 is moved upward, and decreases the gas flow path area when the needle valve 41 is moved downward. It is to be adjusted.
The needle valve 41 is a cylindrical body, and a cylindrical spring accommodating portion 45 having a space for accommodating one end of the coil spring 43 is provided on the head thereof, and a pin 50 is suspended on the side surface of the head. Established. That is, the pin 50 is provided in the direction perpendicular to the vertical movement direction of the needle valve 41. The other end of the coil spring 43 is inserted into a circular spring through hole 42 opened at the base end portion of the heating power adjusting lever 6a, and is held down by a mounting base plate 46 fixedly provided to the gas conduit main body 12. It is done. That is, the coil spring 43 is compressed and provided between the spring accommodating portion 45 of the needle valve 41 and the mounting base plate 46, and the needle valve 41 is urged in the throttle direction by its restoring force.
Adhesive grease is applied to the sliding surface 47 between the needle valve 41 and the gas flow path 15, and appropriate resistance is given to the forward and backward movement of the needle valve 41 due to its viscosity. Further, the needle valve 41 is provided with an O-ring 44 around the needle valve 41 so that airtightness is maintained there.
[0014]
The pin 50 suspended from the side surface of the head of the needle valve 41 is loosely inserted into the vertical guide hole 52 of the guide plate 51 provided at the base end portion of the heating power adjusting lever 6a. Further, on the outside of the guide plate 51, a fixed guide plate 53 formed integrally with the mounting base plate 46 fixed to the gas conduit main body 12 is provided. FIG. 4 shows an external view of the mounting base plate 46. The fixed guide plate 53 has a tapered lower end surface 48a serving as an inclined opening edge, and spreads laterally from the tapered lower end surface 48a (in a direction substantially perpendicular to the advancing / retreating direction of the needle valve in the present invention). A substantially triangular triangular guide hole 48 having an open region 48 b is opened, and the pin 50 of the needle valve 41 is also loosely passed through the triangular guide hole 48. 1 to 3, the fixed guide plate 53 is omitted, and only the triangular guide hole 48 is drawn with a dotted line.
For this reason, the pin 50 is pushed by the vertical guide hole 52 of the guide plate 51 by operating the operation lever 61a connected to the heating power adjustment lever 6a swinging about the axis of the needle valve 41 to the triangular guide hole. 48, the vertical position of the needle valve 41 itself is changed.
[0015]
Further, since the needle valve 41 is urged in the throttle direction by the restoring force of the coil spring 43, if this restoring force is greater than the resistance to the forward / backward movement of the needle valve 41 by the adhesive grease, the needle valve 41 is automatically throttled. There is a risk of moving in the direction. Therefore, a stopper mechanism 60 is provided to prevent such a problem.
The stopper mechanism 60 has a structure in which the tip piece 62 of the operation lever 61a pivotally supported at the end portion of the heating power adjustment lever 6a is urged by the torsion spring 63 to the stop piece 64 provided on the mounting base plate 46. For this reason, the sliding frictional force due to the contact between the tip piece 62 and the stop piece 64 works, and a certain resistance can be given to the left and right movement of the heating power adjusting lever 6a, that is, the up and down movement of the needle valve 41.
[0016]
Next, the gas amount adjustment by the above-described thermal power adjusting device 40 will be described. When the thermal power adjustment lever 6a is in the weak thermal power position (left side), as shown in FIG. 1, the pin 50, that is, the needle valve 41 is in the lowest position and is in contact with the seat surface provided in the gas flow path 15. In addition, the minimum gas flow rate is secured by the bypass hole 49 provided in the center of the needle valve 41, resulting in low heat. When the thermal power adjustment lever 6a is moved to the strong thermal power position (right side), the pin 50 is pushed by the vertical guide hole 52 of the guide plate 51 and moves to the right in the figure. As shown in FIG. 2, the triangular guide hole 48 slides along the tapered lower end surface 48a and moves to the uppermost position at the same speed as the operation of the heating power adjusting lever 6a. Become a high fire. That is, the transition from the low heating power to the high heating power can be performed at the same speed as the opening operation of the heating power adjusting lever 6a.
At this time, the coil spring 43 is compressed and urges the needle valve 41 in the throttle direction. The stopper mechanism 60 causes the resistance larger than the restoring force of the coil spring 43 to move to the weak heating power position (left side) of the heating power adjustment lever 6a. That is, since it is added to the leftward movement of the guide plate 51, the needle valve 41 remains stopped at the uppermost position.
[0017]
On the other hand, when it is desired to change from the high heat power state (FIG. 2) to the low heat power, when the heat power adjustment lever 6a is suddenly moved to the low heat power position (left side), the pin 50 is pushed by the vertical guide hole 52 and is shown in FIG. As shown in FIG. 3, since the upper end surface of the tapered shape that leads the pin 50 downward to the triangular guide hole 48 is not formed and the opening region 48b is formed. In addition, the pin 50 moves in the horizontal direction as it is, and the vertical position of the needle valve 41 does not change.
Since the needle valve 41 is biased downward in the figure by the restoring force of the elastically deformed coil spring 43, the needle valve 41 slowly falls in balance with the adhesive force of the adhesive grease applied to the sliding surface 47, As shown in FIG. 1, the needle valve 41 is lowered to the lowest position and comes into contact with the seat surface, resulting in a low heat.
[0018]
Therefore, even if a rapid throttle operation is performed with the heating power adjusting lever 6a, the actual gas flow rate is slowly reduced, so that the balance between the gas supply amount to the stove burner 30a and the primary air suction amount is lost. It is possible to prevent fire extinguishing and other problems. In addition, when it is desired to change from a low heat power state to a strong heat power, the gas flow path 15 can be opened at the same speed as the opening operation of the heat power control lever 6a, so that the low heat can be switched to the high fire smoothly and quickly. Easy to use.
[0019]
In the gas stove 1 described above, when the operation button 5 a is pushed to the full while the main valve 16 and the magnet valve 17 are both closed, the spindle 13 is interposed via the swinging member 11 and the sliding member 14. Moves, the main valve 16 opens, the magnet valve 17 is pushed open at the tip of the spindle 13 to form the gas flow path 15, the gas flows along the arrow, and the gas is supplied to the stove burner 30a. Is done. The flow rate of the gas supplied to the stove burner 30a is determined by the vertical position of the needle valve 41. That is, as described above, when the heating power adjustment lever 6a is operated and the needle valve 41 is in the upper position, the flow rate is large, and conversely, when the needle valve 41 is in the lower position, the flow rate is small. In a state in which the heating power adjustment lever 6a is set to low heat and the needle valve 41 is lowered to the lowest position and the needle valve 41 is in contact with the seat surface, the bypass hole 49 provided at the center of the needle valve 41 minimizes the minimum. A flow rate is secured. The gas thus adjusted in flow rate and the combustion air are mixed by the burner body 32 and burned at the flame opening. During combustion, a thermocouple (not shown) detects a flame and generates a thermoelectromotive force, and the magnet valve 17 is held open.
[0020]
According to the gas stove 1 equipped with the thermal power control device 40 of the gas appliance described above, even if the operation lever 61a connected to the thermal power control lever 6a is quickly operated from the high thermal power to the weak power to reduce the gas flow rate, Since the needle valve 41 moves only slowly, it is possible to prevent the gas flow rate from being rapidly throttled. For this reason, the balance between the amount of gas supplied to the stove burner 30a and the suction amount of the primary air will not be lost, and it is possible to prevent problems such as fire extinguishing, and to use the gas stove 1 with ease and ease of use. Can do. In addition, when the thermal power adjustment lever 6a is operated from a low thermal power to a high thermal power, the needle valve 41 moves in the same time as the operation time, so that it is possible to smoothly and quickly switch from a low fire to a high fire. Can be used with good feeling.
[0021]
Further, when the heating power adjusting lever 6a is throttled, it is possible to prevent a sudden decrease in the amount of gas supplied to the stove burner 30a without using a mechanism for temporarily stopping the heating power adjusting lever 6a, so that the heating power adjusting lever 6a can be operated smoothly. The operation feeling is good. Further, it is possible to solve the problem of mistaking the position stopped halfway as the position of high or low fire.
[0022]
Also, compared with the conventional thermal power control device 140, basically, the hole provided in the fixed guide plate is changed from the oblique guide hole 148 to the triangular guide hole 48, and the coil spring is provided between the needle valve 41 and the mounting base plate 46. Since the thermal power control apparatus 40 of the present embodiment can be manufactured simply by providing 43, the manufacturing cost is hardly increased.
[0023]
Although the embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention.
For example, in this embodiment, the vertical guide hole 52 is opened in the guide plate 51 that moves to the left and right, and the triangular guide hole 48 is opened in the fixed guide plate 53 that is fixed to the gas conduit main body 12. On the contrary, the triangular guide hole 48 may be opened in the guide plate 51, and the vertical guide hole 52 may be opened in the fixed guide plate 53.
Moreover, in this embodiment, although the gas stove thermal power control apparatus was described, it is not restricted to this, You may apply to other gas cooking appliances, The thermal power control apparatus of gas equipment, such as a gas stove, Of course it can also be applied.
[0024]
【The invention's effect】
As described above in detail, according to the thermal power control apparatus for a gas appliance according to claim 1 of the present invention, even if the manual operation means is quickly closed, the needle valve moves only slowly. It is possible to prevent a sudden squeezing. For this reason, the balance between the amount of gas supplied to the burner and the amount of primary air sucked is not lost, it is possible to prevent problems such as fire extinguishing, and the gas stove can be used conveniently and safely.
Moreover, it can be manufactured at low cost without using a special device.
[0025]
Furthermore, according to the thermal power control apparatus for a gas appliance according to claim 2 of the present invention, there is no problem that the needle valve moves without operating the manual operation means, and the usability is improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a thermal power control apparatus for a gas appliance according to an embodiment as viewed from the side.
FIG. 2 is a cross-sectional view of a thermal power control apparatus for a gas appliance according to the present embodiment as viewed from the side.
FIG. 3 is a cross-sectional view of a thermal power control apparatus for a gas appliance according to the present embodiment as viewed from the side.
FIG. 4 is an external view of a mounting base plate of the present embodiment.
FIG. 5 is an external view of a gas stove provided with a thermal power control device for a gas appliance according to the present embodiment.
FIG. 6 is a schematic configuration diagram of a gas stove provided with a thermal power control device for a gas appliance according to the present embodiment.
FIG. 7 is a cross-sectional view of a conventional thermal power control device for a gas appliance as viewed from the side.
FIG. 8 is an external view of a mounting base plate as a conventional example.
FIG. 9 is an external view of an operation guide frame of an operation lever as a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Gas stove, 6a ... Thermal power control lever, 15 ... Gas flow path, 40 ... Thermal power control device, 41 ... Needle valve, 43 ... Coil spring, 46 ... Mounting plate, 48 ... Triangular guide hole, 48a ... Lower end surface, 48b ... Opening area, 50 ... Pin, 51 ... Guide plate, 52 ... Vertical guide hole, 53 ... Fixed guide plate, 60 ... Stopper mechanism, 61a ... Operation lever.

Claims (2)

In a thermal power control apparatus for a gas device that adjusts the amount of gas by moving a needle valve provided in a gas flow path forward and backward through a manual operation device,
A spring for urging the needle valve in the throttle direction;
An adhesive grease that provides resistance to the forward and backward movement of the needle valve;
Moving means for moving the needle valve in the opening direction by the operating force of the manual operating device;
The moving means has a pin suspended from the needle valve, a first guide plate having a first guide hole through which the pin can be moved forward and backward, and a second guide hole through which the pin is inserted. A second guide plate that changes a relative position of the first guide plate in a direction substantially perpendicular to the advancing / retreating direction of the needle valve when the manual operation device is operated,
The second guide hole is formed with a tapered portion that forms an inclined opening edge that guides the pin so that the needle valve is in an opening direction with respect to a movement of the manual operating device in a strong fire direction. An opening region is formed in which a pin abutting on the taper portion can be moved as it is in a direction substantially perpendicular to the advancing / retreating direction of the needle valve with respect to the operation of the operating device in the low-fire direction. Thermal power control device. 2. The control device according to claim 1, further comprising a restricting unit configured to prevent the needle valve from moving with respect to an urging force of the spring in a throttle direction when the pin is in contact with the tapered portion. Gas equipment thermal power control device.

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