JP2002323218A - Gas valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of prior art that, when a solenoid safety valve is opened by moving an operation rod frontally as in a prior art gas valve, and simultaneously a flow rate control valve is opened, fuel gas might be leaked, if a longitudinal movement of the operation rod is disabled during the operation of opening the solenoid safety valve by the operation rod. SOLUTION: A gas valve includes a solenoid safety valve 3 and a flow rate adjusting valve 5 on internal passages 13a, 13b. The flow rate adjusting valve includes rotators 51, 52, having a closing function rotated by a rotary shaft 23 of drive means 21, and the safety valve is opened by the operation rod 3 movable longitudinally in the internal passage, in response to the rotation of the rotary shaft. The operation rod is coupled to the rotary shaft, such that the safety valve goes back to a predetermined location, after the safety valve is kept in itself in a valve opening state. Once the operation rod goes back to a predetermined position, the rotator permits communication of the internal passage and a gas outflow section 14 to adjust the gas flow rate, in response to its rotation angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas valve for controlling the amount of fuel gas supplied to a gas burner of a gas appliance.

[0002]

2. Description of the Related Art A gas valve of this type is disclosed in
No. -101024. The gas valve includes a valve casing provided with a gas inflow portion and a gas outflow portion at predetermined intervals so as to communicate with each other via an internal passage. An electromagnetic safety valve and a flow control valve are provided in an internal passage of the valve casing. The electromagnetic safety valve and the flow control valve are inserted into the internal passage and are opened by an operation rod movable in the front-rear direction. The operating rod is
The needle valve is connected to a rotary operation unit provided on the front surface of the stove via a cam mechanism for adjusting the amount of movement of the valve body of the needle valve in the front-rear direction, which will be described later.

[0003] The flow control valve is formed as a needle valve having a tapered valve body that can be inserted into a valve hole formed in an internal passage. The valve body is formed integrally with the operating rod to simplify the assembly operation. Then, the operation portion is rotated to move the operation rod in the front-back direction to change the insertion depth of the valve body into the valve hole, and the supply amount of the fuel gas is adjusted according to the insertion amount.

[0004]

However, in this case, since the operation rod is moved forward to open the electromagnetic safety valve and the flow control valve is opened at the same time, the operation of opening the electromagnetic safety valve by the operation rod is performed. If the operation rod cannot move in the front-rear direction during the operation, fuel gas may leak.

In view of the above problems, it is an object of the present invention to provide a gas valve which does not leak fuel gas even when the operation rod cannot be moved in the front-rear direction during the operation of opening the electromagnetic safety valve. .

[0006]

In order to solve this problem, a gas valve according to the present invention is provided with a gas inlet and a gas outlet at predetermined intervals so as to communicate with each other via an internal passage. A valve casing, and in the internal passage,
A gas valve provided with a safety valve capable of holding a valve open state and a flow control valve for controlling a gas flow rate of a fuel gas,
The flow control valve includes a rotating body with a closing function that is rotated by a rotating shaft of a driving means attached to a valve casing, and the safety valve opens an internal passage in accordance with rotation of the rotating shaft by an operation rod movable in the front-rear direction. The valve is operated, and the operation rod is connected to the rotating shaft so as to retreat to a predetermined position after the safety valve is held in the open state. It is characterized in that communication with the gas outlet is allowed and the gas flow rate is adjusted according to the rotation angle.

According to the present invention, when the rotation shaft is rotated to one side by the driving means, the operation rod is moved forward of the internal passage to open the safety valve. When the valve is opened, the safety valve is kept open. In this case, although the fuel gas flows into the internal passage, the fuel gas does not flow to the gas outlet since the flow control valve is still closed. When the rotation shaft is further rotated in the same direction, the operation rod starts moving backward in the internal passage, and when the operation rod retreats to a predetermined position, the rotating body of the flow control valve establishes communication between the internal passage and the gas outlet. Allow. At this time, the combustion gas flowing into the internal passage flows to the gas outlet. Then, the gas flow rate is adjusted according to the rotation angle of the rotating body.

[0008] Here, the rotating body is, for example, a fixed disk having at least one first communication hole, and is rotated by the rotation shaft, and when rotated by a predetermined rotation angle, a second disk that coincides with the first communication hole. And a rotating disk having two communication holes. In this case, it is preferable that the first communication hole is constituted by a plurality of holes having different opening areas provided at predetermined intervals along the same circumferential line of the fixed disk.

By the way, for example, when the gas burner is set to medium heat, the gas flow rate of the fuel gas to be supplied to the gas burner differs depending on the type of the fuel gas used (hereinafter referred to as "gas type"). I do. Therefore, it is desirable that the gas flow rate can be set for each gas type. in this case,
An orifice member having an orifice hole for increasing or decreasing the gas flow rate of the fuel gas that has passed through the first communication hole according to the gas type is detachably mounted on the downstream side of the fixed disk so as to coincide with the first communication hole. You should keep it.

Further, when the opening and closing of the safety valve and the adjustment of the gas flow rate by the flow control valve are performed electrically, the opening and closing of the safety valve and the adjustment of the gas flow rate by the flow control valve are controlled by separate detection means. As a result, the number of parts increases and the cost increases. In this case, the connection between the rotating shaft and the operation rod may be performed via a cam member attached to the rotating shaft, and the driving unit may be provided with a single detecting unit for detecting the rotation angle of the rotating shaft. . In this case, after the safety valve is opened, the flow control valve is opened to maximize the gas flow rate, so that a series of operations from reducing the gas flow rate to closing the flow control valve is performed by one rotation shaft. It is preferable to complete the rotation after one rotation.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
For example, a gas valve according to a first embodiment used for a gas stove provided with a gas burner (not shown) is shown. The gas valve 1 has a valve casing 11 having a substantially L-shaped cross section. A gas inlet 12 is provided on an outer wall surface of the valve casing 11.
Is provided. The gas inlet 12 communicates with internal passages 13a and 13b having a substantially L-shaped cross section and includes a horizontal portion 13a and a vertical portion 13b formed in the valve casing 11. The internal passages 13a and 13b
Communicates with the gas outlet 14 provided at the top of the gas outlet.

The gear box 2 is connected to the lower side of the valve casing 11. The gearbox 2 is provided with a rotating shaft 23 that is rotated by a gear train 22 having a geared motor 21, and one end of the rotating shaft 23 projects through a sealing member 24 into a vertical portion 13 b of an internal passage. An encoder 25 is attached to the rotating shaft 23,
The rotation angle of the rotation shaft 23 is detected.

An electromagnetic safety valve 3 is provided in the horizontal portion 13a at a position downstream of the gas inlet 12. The electromagnetic safety valve 3 has a magnet case 31. The magnet case 31 accommodates, for example, an electromagnet which is excited based on a signal from a control unit provided on the stove body and an attracting piece which is attracted to the electromagnet. The suction piece has a valve body 3 protruding from the magnet case 31 downstream of the horizontal portion 13a.
2 are connected. In the closed state of the electromagnetic safety valve 3, the valve body 32 is seated in a state where it is biased by a spring 34 on a valve seat 33b provided on a valve member 33 inserted into the horizontal portion 13a via a sealing member 33a. .

The valve opening operation of the electromagnetic safety valve 3 is performed by the operation rod 4 movable in the front-rear direction on the horizontal portion 13a urged in the direction of the rotation shaft 23 by the spring 41. The operation rod 4 is moved forward of the horizontal portion 13a by a cam member 42 attached to the rotating shaft 23, and pushes the valve body 32 (FIG. 2A).
reference). Here, when the electromagnetic safety valve 3 is opened, it is possible to prevent a poor opening of the electromagnetic safety valve 3 due to insufficient pushing of the operation rod 4 with respect to the valve body 32, and an overload acts on the electromagnetic safety valve 3 during the pushing operation. To prevent this, a slider 43 is interposed between the operation rod 4 and the cam member 42, and a cushion spring 44 is contracted between the slider 43 and the operation rod 4. The cam member 42 is configured so that the operation rod 4 is moved more than the movement amount (stroke) necessary for the valve opening operation of the electromagnetic safety valve 3, and the extra movement amount is absorbed by the cushion spring 44.

The vertical portion 13b is provided with a flow control valve 5 for controlling the flow rate of the fuel gas to the gas outlet 14. The flow control valve 5 has a rotating body with a closing function.
In this case, the rotating body includes a rotating disk 51 connected to the rotating shaft 23, and a fixed disk 52 positioned above the rotating disk 51 and fitted to the vertical portion 13b.

As shown in FIG. 2B, the fixed disk 5
2 are four holes 52 which are four first communication holes on the same circumference.
a, 52b, 52c, and 52d are provided with different opening areas from each other. On the other hand, when the rotation shaft 23 rotates by a predetermined angle, each of the holes 52 of the first communication hole is
a, 52b, 52c, and 52d.
One elliptical second communication hole 51a that allows communication between the a and 13b and the gas outlet 14 is provided.

When the rotating disk 51 rotates, the first hole 52a of the first communication hole that first coincides with the second communication hole 51a has a maximum opening area. The fuel gas having the gas flow rate described below flows to the gas outlet 14. Here, when switching the thermal power, if the gas flow rate is determined by one hole, the gas flow rate tends to change when the hole is switched.

In the present embodiment, the second communication holes 51a are formed in the adjacent second holes 52b and 52c and the third communication holes 51a.
The opening area of the second communication hole 51a of the rotating disk 51 is set so that the hole 52c and the fourth hole 52d coincide with each other at the same time and the state is maintained within a predetermined rotation angle range of the rotating disk 51. . The distance between the first, second, third, and fourth holes 52a, 52b, 52c, and 52d is the same as that of the second communication hole 51a during rotation of the rotating disk.
Is always one of the holes 52a, 52b, 52c, 52
It was set so as to be in the same state in d.

The second communication hole 51a is connected to the second hole 52b.
The fuel gas having a gas flow rate that makes the gas burner medium-fire when it is in the third hole 52c and the third hole 52c.
The fuel gas having a gas flow rate that makes the gas burner low-fire when it is within 2d, and the fuel gas having a gas flow rate that makes the gas burner the minimum throttle flow only when it is within the fourth hole 52d, flow to the gas outlet 14.

Here, for example, in order to set the gas burner to the minimum throttle or medium heat, the gas flow rate of the fuel gas to be supplied to the gas burner differs depending on the gas type. Therefore, it is necessary to set the gas flow rate for each gas type. In the present embodiment, as shown in FIGS. 1 to 3, each of the first communication holes 52 a, 52 b, and 52 according to the gas type is provided on the upper surface of the fixed disk 52 via a sealing material 53.
The orifice member 54 provided with four orifice holes 54a, 54b, 54c and 54d for increasing and decreasing the gas flow rate of the fuel gas passing through the first and second communication holes 52a and 52d.
2b, 52c, and 52d are attached so as to match each other. The gas outlet 1 having the gas outlet 14 is provided so that the orifice member 54 can be replaced according to the gas type.
4a is formed separately from the valve casing 11, and is detachable from the valve casing 11.

By the way, as in the conventional gas valve, when the operation rod is moved forward to open the electromagnetic safety valve and the flow control valve is opened at the same time, the operation rod pushes the electromagnetic safety valve. If the operation rod cannot move in the front-rear direction, fuel gas may leak. In this embodiment, the operating rod 4 is rotated by rotating the rotating shaft 23.
Pushes the valve body 32 of the electromagnetic safety valve 3, and the cam member 42 is configured so that the operating rod 4 starts to retreat when the attraction piece connected to the valve body 32 is attracted to the electromagnet. When it is retracted to a predetermined position, the second communication hole 51a
The rotating disk 51 was mounted on the rotating shaft 23 such that the position of the rotating disk 51 coincided with the first hole 52a of the first communication hole. Thereby, even if the operation rod 4 cannot move in the front-rear direction during the valve opening operation of the electromagnetic safety valve 3, the fuel gas does not leak. Also, the rotating shaft 2
3, the movement of the operating rod 4 in the front-rear direction and the rotation of the rotating disk 51 can be controlled only by detecting the rotation angle of the rotating shaft 23 by the encoder 25 which is one detecting means provided in
Cost can be reduced by reducing the number of parts.

Next, the operation of the gas valve 1 of the present invention will be described with reference to FIG. 1, FIG. 2 and FIGS. When the geared motor 21 is driven to rotate the rotation shaft 23 in the forward direction via the gear train 22 from the closed state of the gas valve 1 (the rotation angle of the rotation shaft 23 is 0 degree) shown in FIG. 1 and FIG. The cam member 42 attached to the rotating shaft 23 rotates to move the operation rod 4 forward (to the right in the drawing) of the horizontal portion 13a. At the position shown in FIG. 4A, the operating rod 4 moves forward and pushes the valve body 32 toward the magnet case 31 (rotational angle 63 of the rotating shaft 23).
Every time). In this case, the second communication hole 51a of the rotary disc 51
Does not yet reach the first hole 52a of the first communication hole of the fixed disk 52 (see FIG. 4B), so that the fuel gas does not flow to the gas outlet 14.

When the rotating shaft 23 is further rotated, the operating rod 4 starts to retreat. In this case, the electromagnet of the electromagnetic safety valve 3 is excited by receiving a signal from the encoder 25 provided on the rotating shaft 23, and the electromagnetic safety valve 3 is maintained in the open state. Then, the operation rod 4 is retracted to the position shown in FIG. 5A (the rotation angle of the rotation shaft 23 is 93 degrees). Also in this case, the second communication hole 51a of the rotating disk 51 is
The fuel gas does not flow to the gas outlet 14 because it does not reach the first hole 52a of the second communication hole (see FIG. 5B).

When the rotating shaft 23 is further rotated, the second communication hole 51a of the rotating disc 51
The internal passages 13a and 13b communicate with the gas outflow portion 14a so as to coincide with the inside of the hole 52a. At this time, the internal passages 13a,
The fuel gas that has flowed into 13b flows through the flow control valve 5 to the gas outlet 14, and reaches the position shown in FIG. 6A (the rotation angle of the rotating shaft 23 is 170 degrees), and the gas burner is ignited. Will be In this case, the fuel gas having a gas flow rate that causes the gas burner to fire strongly flows through the gas outlet 14 to the mixing pipe of the gas burner. Note that the electromagnetic safety valve 3 is
If the flame of the gas burner is not detected by a thermocouple provided near the gas burner within a predetermined time after the rotation angle of 170 reaches 170 degrees, the valve is closed.

After the gas burner is ignited, when the rotating shaft 23 is further rotated to the position shown in FIG. 6B to rotate the rotating disk 51, the second communication holes 51a are connected to the second and third communication holes 51a.
(Rotational angle 2 of rotation shaft 23)
30 degrees). In this case, a fuel gas having a gas flow rate for setting the gas burner to medium heat flows through the gas outlet 14 to the mixing pipe of the gas burner.

Next, when the rotating shaft 23 is further rotated to the position shown in FIG. 6 (C) to rotate the rotating disk 51, the second communication hole 51a becomes the third and fourth holes 52c, 5c.
2d (the rotation angle of the rotation shaft 23 is 270 degrees). In this case, a fuel gas having a gas flow rate for weakening the gas burner flows through the gas outlet 14 to the mixing pipe of the gas burner.

Next, when the rotating shaft 23 is rotated to the position shown in FIG. 6D to rotate the rotating disk 51, the second communication hole 51a matches only the fourth hole 52d (the rotation angle of the rotating shaft 23). 295 degrees). In this case, a fuel gas having a gas flow rate that minimizes the gas burner flows through the gas outlet 14 to the mixing pipe of the gas burner. In order to increase the thermal power of the gas, the motor 21 is rotated in the reverse direction to rotate the rotating shaft 2.
3 may be rotated in the opposite direction.

Here, with reference to FIG. 7, a description will be given of a change in the combustion amount (Kcal) of the gas burner in the gas valve 1 according to the present invention, which is converted from the amount of fuel gas supplied to the gas burner with natural gas and city gas. . The line A indicates, as a first comparative example, the second communication holes 51a are the respective holes 52a, 5a of the first communication holes.
The amount of combustion when the spaces and the opening areas between the holes 52a, 52b, 52c, and 52d and the opening area of the second communication hole 51a are set so as to coincide with the adjacent holes while closing the holes 2b, 52c, and 52d. Shows the change in In this case, in city gas having a large gas flow rate, the first hole 52a
The gas flow rate was sharply reduced near the point a1 at which the gas was switched to the second hole 52b, and the amount of combustion was reduced, and the amount of fuel near the point a1 was smaller than the amount of combustion at medium heat of the gas burner. In addition, in the case of natural gas having a small gas flow rate, when the gas burner was adjusted from medium heat to low heat and from low heat to the minimum throttle, the combustion amount once increased as shown by points a2 and a3.

The line B is a second comparative example, in which the second communication hole 5
1a is each hole 52a, 52b, 52c, 52 of the first communication hole.
d so that the holes 52 do not obstruct each other so as to sequentially coincide with adjacent holes.
5 shows changes in the amount of combustion when the distances and opening areas between a, 52b, 52c, and 52d and the opening area of the second communication hole 51a are set. In this case, in city gas having a large gas flow rate, the combustion amount once increased near points b1 and b2 when the gas flow rate was reduced from medium to low and from low to minimum. Similarly, in the case of natural gas having a small gas flow rate, the combustion amount increased as shown by points b3 and b4 when the thermal power was adjusted from medium to low heat and from low to minimum throttle of the gas burner. On the other hand, in the gas valve 1 of the present invention, as shown by the line C, the amount of combustion was able to be reduced almost continuously for both natural gas and city gas.

Finally, when the geared motor 21 is driven to further rotate the rotary shaft 23 to rotate the rotary disk 51, the second communication hole 51a is disengaged from the fourth hole 52d. In this case, the flow control valve 5 is closed, the supply of fuel gas to the gas burner is stopped, and the gas burner is extinguished. In this case, the electromagnetic safety valve 3 is closed when it is confirmed from the thermocouple provided near the gas burner that the flame of the gas burner has extinguished. Accordingly, a series of operations from opening the electromagnetic safety valve 3 to opening the flow control valve 5 to maximize the gas flow rate and closing the gas flow rate to closing the flow control valve 5 are performed by rotating the electromagnetic safety valve 3. The process is completed when the shaft 23 makes one rotation.

In this embodiment, a gear train 22 provided with a geared motor 21 for rotating a rotating shaft 23 is provided.
However, as shown in FIG. 8, it is also possible to directly rotate the rotating shaft 23 using a stepping motor 21a provided in the gear box 2. Further, as shown in FIG. 9, a rotation operation part 23a may be attached to an end of a rotation shaft 23 protruding from the valve casing 11, and the rotation operation part 23a may be rotated to adjust a gas flow rate. .

In this embodiment, the rotating disk 5
The flow control valve 5 is composed of a rotating body provided with a fixed disc 52 and a fixed disk 52. As shown in FIG.
, The flow control valve 5 can be constituted. in this case,
A closed accommodating chamber communicating with the gas outlet 14 is formed in the vertical portion 13b of the internal passage, and the closed accommodating chamber is integrally formed with a rotating shaft 23 rotated by a gear train 22 having a geared motor 21. A rotatable closing member that is rotatable and has a gas passage therein is provided. And the rotating shaft 23
And the opening provided on the outer peripheral surface of the rotating closing member is made to coincide with the opening communicating with the gas outlet 14 of the closing accommodating chamber. The gas flow to the air is adjusted.

FIGS. 11 and 12 show a gas valve 100 according to a second embodiment, which is used, for example, for a grill of a gas stove provided with an upper fire burner and a lower fire burner which are fuel burners. Show. The gas valve 100 includes a valve casing 110 having a substantially L-shaped cross section, and a horizontal portion 111 provided with an electromagnetic safety valve 3 and an operation rod 4 for performing an opening operation of the electromagnetic safety valve 3 as in the above embodiment. , A vertical portion 112, and the internal passage communicates with the gas outlet 14.

The vertical section 112 is provided with a governor valve 120 for attenuating pressure fluctuations of fuel gas that can cause unstable combustion of the combustion plate type burner. The governor valve 120
Has a governor valve body 121 connected to a valve casing 110, and inside the governor valve body 121, a spring 122 is formed in a direction toward a valve seat 113 formed on a top surface of a vertical portion 112.
Is accommodated. A flow control valve 130 is provided between the downstream side of the diaphragm 123 and the gas outlet 14.

The flow control valve 130 has a rotating body composed of a fixed disk 132 fitted to the valve casing 110 via a sealing material 131 and a rotating disk 133 below the fixed disk 132. The fixed disc 132 has one first communication hole 132 a corresponding to the first communication passage 134 between the governor valve 120 and a second communication hole matching the second communication passage 135 between the gas outlet 14. Four holes 132
b, 132c, 132d, and 132e are provided at predetermined intervals on the same circumference.

The first and second holes 132b and 132c adjacent to each other and having a large opening area have the same opening area, and have a gas flow rate that makes both the upper and lower burners of the grill a strong fire. Is configured to flow to the gas outlet 14. Also, the third and fourth holes 132d and 132e adjacent to each other and having a small opening area also have the same opening area, and a fuel gas having a gas flow rate for weakening both the upper and lower burners is supplied by gas. It is configured to flow to the outlet.

On the other hand, the rotating disk 133 rotated by the rotating shaft 23 provided through the horizontal portion 111 has the first and second communication holes of the fixed disk 132 according to the rotation angle of the rotating shaft 23. 132a, 132b, 132c, 13
A third slot in the circumferential direction that allows communication between the first communication path 134 and the second communication path 135 via 2d and 132e.
A communication hole 133a is provided. In this case, the opening area of the third communication hole 133a is determined by the first communication hole 132a and any two of the second communication holes 132b, 132c, and 13b.
2d and 132e are set to coincide with each other.

The operation of the gas valve 100 according to the second embodiment will be described with reference to FIG. The valve closing state of the flow control valve 130 shown in FIG.
In the figure, the third communication hole 133a does not match the inside of the first communication hole 132a. In this case, communication between the first communication path 134 and the second communication path 135 is interrupted. In this state, when the geared motor (not shown) is driven to rotate the rotating shaft 23, the operating rod 4 moves forward to open the electromagnetic safety valve 3 as in the gas valve of the first embodiment. .
In this case, the fuel gas flows into the internal passage, and the governor valve 1
20 is opened. Then, when the operation rod 4 is retracted to a predetermined position, as shown in FIG. 12B, the third communication hole 133a becomes the first communication hole 132a and the first communication hole of the second communication hole.
The hole 132b and the second hole 132c are aligned with each other (the rotation angle of the rotation shaft is 140 degrees), and the first communication path 134 and the second communication path
The communication path 135 communicates with the communication path 135. In this case, a fuel gas having a gas flow rate that makes the burner a strong fire is supplied to a mixing pipe of both the upper and lower burners.

When the rotating shaft 23 is further rotated to the position shown in FIG. 12C, the third communication hole 133a becomes the first communication hole 132a, and the second communication hole includes the first hole 132b and the fourth hole 132e. (Rotational angle of rotation shaft 20)
0 degrees). In this case, the mixing pipe of the upper fire burner is supplied with a fuel gas having a gas flow rate that makes the burner a strong fire, and the mixing pipe of the lower fire burner is supplied with a fuel gas having a gas flow rate that makes the burner a low fire. You.

When the rotating shaft 23 is further rotated to the position shown in FIG. 12 (D), the third communication hole 133a becomes the first communication hole 132a and the third communication hole 132d and the fourth communication hole 132e of the second communication hole. (Rotational axis of rotation 26
0 degrees). In this case, a fuel gas having a gas flow rate for weakening the burner is supplied to the mixing pipe of both the upper and lower burners.

[0041]

As described above, in the gas valve of the present invention, the flow control valve is closed even when the operation rod is moved forward to open the electromagnetic safety valve.
When the operation rod pushes the electromagnetic safety valve, the fuel gas does not flow even if the operation rod cannot be moved in the front-rear direction.

[Brief description of the drawings]

FIG. 1 is a sectional view of a gas valve according to a first embodiment.

FIGS. 2A and 2B are diagrams for explaining a relationship between a moving position of an operating rod and a rotating position of a rotating disk with respect to a fixed disk.

FIG. 3 is a plan view showing an orifice member.

FIGS. 4A and 4B are diagrams for explaining a relationship between a moving position of an operating rod and a rotating position of a rotating disk with respect to a fixed disk.

FIGS. 5A and 5B are diagrams illustrating a relationship between a moving position of an operating rod and a rotating position of a rotating disk with respect to a fixed disk.

FIGS. 6A, 6B, 6C, and 6D are views for explaining a rotational position of a rotary disk with respect to a fixed disk;

FIG. 7 is a graph showing combustion characteristics of the gas valve of the present invention.

FIG. 8 is a partial sectional view showing a modification of the gas valve of the first embodiment.

FIG. 9 is a partial cross-sectional view showing another modified example of the gas valve of the first embodiment.

FIG. 10 is a partial cross-sectional view showing another modified example of the gas valve of the first embodiment.

FIG. 11 is a sectional view showing a gas valve according to a second embodiment.

FIG. 12 is a view for explaining a rotational position of a rotating disk with respect to a fixed disk.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas valve 11 Valve casing 13a, 13b Internal passage 15 Internal passage 21 Geared motor 23 Rotary shaft 4 Operation rod 5 Flow control valve

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yuichi Hayashi 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya, Aichi Prefecture Inside Rinnai Corporation (72) Inventor Yoichiro Ishigaki 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi, Aichi F-term in Linnai Corporation (reference) 3H053 AA03 AA32 BA02 BA04 CA01 DA01 3K068 AA01 BB01 BB13 BB20 DA14

Claims (6)

[Claims] 1. A valve casing provided with a gas inlet and a gas outlet at predetermined intervals so as to communicate with each other via an internal passage, and the internal passage can be kept open. A safety valve and a flow control valve for controlling the gas flow rate of the fuel gas, wherein the flow control valve is a rotating body with a closing function that is rotated by a rotation shaft of a driving means attached to a valve casing. The safety valve is opened by an operation rod movable in the front-rear direction in the internal passage in accordance with the rotation of the rotation shaft, and the operation rod is retracted to a predetermined position after the safety valve is held in the open state. When the operating rod is retracted to a predetermined position, the rotating body allows the communication between the internal passage and the gas outlet to adjust the gas flow rate according to the rotation angle. Gas valve 2. The rotating body includes a fixed disk having at least one first communication hole, and a second communication hole that is rotated by the rotation shaft and coincides with the first communication hole when rotated by a predetermined rotation angle. The gas valve according to claim 1, further comprising: a rotating disk having: 3. The fixing device according to claim 2, wherein the first communication hole comprises a plurality of holes having different opening areas provided at predetermined intervals along the same circumferential line of the fixed disk. Gas valve. 4. An orifice member having an orifice hole on the downstream side of the fixed disk for increasing or decreasing the gas flow rate of the fuel gas passing through the first communication hole according to the type of gas is made to coincide with the first communication hole. 4. The gas valve according to claim 2, wherein the gas valve is detachably mounted. 5. A connection between the rotating shaft and the operating rod via a cam member attached to the rotating shaft, and a single detecting means for detecting a rotation angle of the rotating shaft is provided in the driving means. The gas valve according to any one of claims 1 to 4, characterized in that: 6. A series of operations from opening the safety valve to opening the flow control valve to maximize the gas flow rate and reducing the gas flow rate and closing the flow control valve is performed on a rotating shaft. The gas valve according to any one of claims 1 to 5, characterized in that the gas valve is configured to be completed after one rotation of one side.