JP2614692B2 - Operation mechanism of flow control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of operability of operating means of a flow control device.

[0002]

2. Description of the Related Art In a fuel gas flow path of a gas appliance, a gas flow rate can be increased or decreased from a maximum (strong combustion) to a minimum (weak combustion) to adjust the thermal power of a burner, and gas supply is stopped (extinguished). A flow control device is provided that includes a throttle valve that can be operated. This flow control device includes an operation device including an operation lever such as an operation lever for operating the throttle valve from a maximum opening degree (strong combustion) to a minimum opening degree (weak combustion) to close the valve (fire extinguishing). Operated by means.

[0003] This operating element can be stopped at a predetermined position in order to set a desired heating power by applying a predetermined operating force from the maximum opening position to the minimum opening position of the throttle valve. When operating the operator from the minimum opening position to the combustion stop position, only the both ends are set to the effective stop position to ensure stable combustion, and an operation piece biasing mechanism is attached to prevent stopping during the operation. Is done. As the operation piece urging mechanism, a rotation piece that meshes with the operation piece and turns, and a spring that has one end locked to the operation piece and the other end locked to an outer portion of the rotation piece and stretched. Is generally heavily used. When the operating piece urging mechanism is used, a dead center occurs in which the spring load does not act on either the minimum opening position side or the combustion stop position side. At this dead point, the operating element is not provided with a biasing force from a spring, so that when the user stops applying the operating force, the operating element stops.

[0004]

In the conventional operating piece urging mechanism, the relationship between the valve closing position of the throttle valve and the dead center position has not been sufficiently considered. Therefore, when the operation element stops at the dead center position, the opening of the throttle valve is smaller than the set minimum opening, so that the amount of gas to be jetted becomes extremely small, combustion cannot be maintained, and a misfire state occurs. And there was a risk of release of raw gas. An object of the present invention is to operate a flow control device without using a danger of releasing raw gas by always closing a throttle valve when an operation element stops at a dead point in a device using an operation piece urging mechanism. In providing the means.

[0005]

An operation mechanism of a flow control device according to the present invention is provided in a fluid supply passage and has a variable valve opening between a maximum valve opening and a valve closing. An operation piece for operating the valve from the maximum opening to the minimum opening to closing the valve,
An operating piece biasing member comprising: a rotating piece that meshes with the operating piece and rotates; and a spring that has one end locked to the operating piece and the other end locked to an outer portion of the rotating piece. In the operation mechanism of the flow control device provided with the mechanism, in the valve closing operation from the minimum opening position of the throttle valve, the operation piece is initially subjected to a spring load that is to return to the minimum opening position of the spring. Displaced in the opposite direction, the spring becomes neutral at the dead point corresponding to the mesh point of the operating piece and the rotating piece, and after the spring passes through the dead point, the operating piece is set to the combustion stop position. Is urged toward the combustion stop position by the spring load of the spring,
The valve closing position of the throttle valve is set on the minimum opening position side of the dead center.

[0006]

In the operation mechanism of the flow control device according to the present invention, the valve closing position of the throttle valve is set to the minimum opening degree from the dead center. This allows the operating piece to move to the minimum opening position or the combustion stop position due to the urging force of the spring if the hand is released before or after the dead center when the operating piece is operated to the combustion stop position. At this time, since the throttle valve is in the minimum opening degree or the valve closing state, the minimum combustion is continued or the fire is extinguished. Even when the operating force is released by releasing the hand from the operating piece at the dead center and the operating piece stops at that position, the throttle valve is closed at that time, so that it is safe. Also, in the case of operation in the reverse direction, the throttle valve is closed at the dead center, so that the throttle opening is not smaller than the set minimum opening degree, which is safe.

[0007]

1 to 3 show a thermal power control device 1 for a grill burner using an operation mechanism of a flow control device according to an embodiment of the present invention. As shown in FIG. 4, the grill burners are a lower fire burner (first burner) B1 horizontally installed at the lower part on both sides of the grill warehouse G, and an upper fire burner (second burner) horizontally installed above the grill warehouse G. B2, and a fire pilot burner BP with a continuous crater, which is attached to the back of the grill storage G in an up-down direction so as to perform a fire transfer to the first burner B1 and the second burner B2. Thermal power control device 1
Comprises a fuel gas flow control device 2 provided inside and outside the valve body 10, and an operation mechanism 3 for operating the flow control device 2, the operation part of which is installed on the front surface of the gas stove. The burner B1, the second burner B2, and the pilot pilot burner BP are responsible for ignition, extinction, and thermal power adjustment.

The flow control device 2 has a safety valve 21, a main valve 22, and a governor 23 interposed on the upstream side of the gas supply path 11. The gas supply path 11 downstream of the governor 23 is
It branches into a first branch 12 to the first burner B1, a second branch 13 to the second burner B2, and a branch 14 to the normal-fire pilot burner BP. The fire pilot burner BP is provided with a sparker 16 as an ignition device. In the branch passages 12 and 13, the gas flow rate is gradually changed from a maximum heating power (maximum valve opening) to a minimum heating power (minimum valve opening), and combustion can be stopped (closed). A first throttle valve 4 and a second throttle valve 5 are provided. The valve body 10 is formed by fastening an upstream block 1A and a downstream block 1B. The upstream block 1A is provided with a safety valve 21, a main valve 22, and a governor 23, and the downstream block 1B is provided with a first throttle valve 4.
And a second throttle valve 5.

The operating mechanism 3 opens and closes the safety valve 21 and the main valve 22, and also operates a point fire button 15 also serving as a switch for generating a discharge spark from the sparker 16, and operates the first throttle valve 4 to operate the first burner B1. And a second lever (operator) 7 for operating the second throttle valve 5 to adjust the heating power of the upper fire burner B2. A first link mechanism 60 is provided between the first lever 6 and the first throttle valve 4, and the second lever 7 and the second
A second link mechanism 70 is provided between the throttle valve 5 and the throttle valve 5. The first lever 6 and the second lever 7 are vertically arranged side by side,
Each of them can be displaced left and right. In each case, combustion is stopped at the right end position, weak combustion is at the middle position, and strong combustion is at the left end position. The first lever 6 and the second lever 7 are provided with an alternative mechanism 8 for preventing these two levers from being simultaneously set to the combustion stop position (right end position).

The first throttle valve 4 and the second throttle valve 5 have the same structure, and are provided with valve holes 40, 50 formed in parallel from the upper end surface of the downstream block 1B obliquely downward, and these valve holes 40, 50. The needle valve elements 41 and 51 have upper ends protruding from them and are slidably fitted. The cam mechanisms C1 and C for converting the rotation operation of the link mechanisms 60 and 70 into the linear operation of the needle valve bodies 41 and 51 are provided on the upper end surface of the block 1B.
2 are provided. The cam mechanisms C1 and C2 include locking rods 42 and 52 projecting rearward from the projecting upper ends of the needle valve bodies 41 and 51, respectively, and locking rods 42 and 52.
And cam slits 43 and 53 slidably inserted. The cam slits 43, 53 have a bottomless box shape, and the front and rear side plates 44 of the cover plate 4A whose top plate is fastened to the downstream block 1B so as to cover the upper end surface of the block 1B,
54 are formed to be inclined in opposite directions.

As shown in FIG. 5 to FIG.
0 is a large diameter first valve port 45, 55 on the upstream side (upper side in the figure).
And the second valve ports 46 and 56 having a small diameter on the downstream side.
The needle valve bodies 41 and 51 are provided with the first valve port 4 on the upstream side.
Large first valve body 4 with O-ring for opening and closing 5, 55
7, 57 are provided, and the second valve ports 46, 5,
6 that opens and closes the second valve body 48 and 58, and connects the downstream outer periphery of the O-ring and the downstream of the second valve bodies 48 and 58 respectively, bypassing the second valve bodies 48 and 58 inside. Orifices 49 and 59 are provided. The first throttle valve 4 and the second throttle valve 5 are connected to the first lever 6 and the second
By operating the first lever 6 and the second lever 7 to the right by a predetermined distance from the intermediate position of the lever 7 (weak combustion) to displace the needle valve bodies 41 and 51 downward, the valve is closed (fire extinguishing), and furthermore. By moving the first lever 6 and the second lever 7 rightward by a small predetermined distance and displacing the needle valve bodies 41 and 51 downward (about 1 mm), the valve closing is ensured. As shown in FIG. 7, the valve is closed in a state where the O-ring contacts the inlets of the first valve ports 45 and 55, and the needle valve bodies 41 and 51 are closed.
Is displaced until the O-ring is fitted into the first valve ports 45 and 55 (about 1 mm).

The first link mechanism 60 and the second link mechanism 70 include a substantially rectangular frame-shaped bracket 6A fastened to the front end surface of the upstream block 1A and a first fulcrum P1 provided at the center of the upper plate 6B. And a second fulcrum P2 provided at the center of the top plate 4B of the cover plate 4A. First lever 6
The intermediate portion of the second lever 7 (see FIG. 3) slides on the lower surface and the upper surface of the upper plate portion 6B and is pivotally supported by the first fulcrum P1. And pins 62 and 72 project from the rear end, respectively. At the second fulcrum P2, a V-shaped link lever 63 and a seesaw type link lever 73 are both pivotally supported so as to overlap with the upper surface of the top plate 4B of the cover plate 4A. At one end (front end) of each of the link levers 63 and 73, slits 64 and 74 are formed to bite the pins 62 and 72, and the other end is bent vertically downward, and the slits bite the locking rods 42 and 52. 65 and 75 are formed.

On the lower surface of the first lever 6 and the upper surface of the second lever 7, when the first lever 6 and the second lever 7 are reciprocated between an intermediate position (weak combustion) and a right end position (fire extinguishing). (Operating piece) urging mechanisms F1 and F for urging the first lever 6 and the second lever 7 to one position.
2 is attached. Lever biasing mechanism F1 and F2
Has a rotating piece 67 that slides on the lower surface of the first lever 6 and a rotating piece 77 that slides on the upper surface of the second lever 7.
The rotating pieces 67 and 77 are attached to the upper plate 6B of the bracket 6A.
Are supported rotatably on a pivoting fulcrum 66 and a pivoting fulcrum 76 attached to the lower side 6D and the upper side 6E of the extension 6C extending forward from the front. First fulcrum P1 and rotating one fulcrum 66
On the lower surface of the first lever 6 and the upper surface of the second lever 7 intermediate the pivot piece fulcrum 76, engaging pins P6 and P7 are provided, respectively. The places Q6 and Q7 are formed. Rotating piece 6
Pins 6 protruding from the outer ends of the upper and lower plates 7 and 77, the lower surface of the middle portion of the upper plate 6B, and the upper surface of the middle portion of the upper plate 6B.
Between 8 and 78, coil springs 69 and 79 are stretched.

The alternative mechanism 8 includes an upper plate 6 of the bracket 6A.
A support shaft 81 attached to an upwardly bent portion 6F provided at the center of the tip of the extension 6C from B, a quadrant 82 whose center side is rotatably supported by the support shaft 81, The rotation stopper 83 is provided around the quadrant 82 provided at the lever-side end of the portion 6F. As shown in FIG. 3, when the first lever 6 is set at the right end position (fire extinguishing), one of the edges 84 of the quadrant 82 contacts the first lever 6, as shown in FIG. The other edge 85 of the quadrant 82 is the second lever 7
And are arranged orthogonally. As a result, the quadrant 82 becomes the first
The second lever 7 is prevented from rotating to the right end position (fire extinguishing) by being prevented from rotating by the lever 6 and fixed. Conversely, the second
When the lever 7 is set at the right end position (fire extinguishing), the other edge 85 of the quadrant 82 abuts the side surface of the second lever 7, and the one edge 84 is orthogonal to the first lever 6. When it is arranged, the first lever 6 is prevented from displacing to the right end position (fire extinguishing). As a result, an alternative is made that only one of the first lever 6 and the second lever 7 is set to the fire extinguishing position.

The operation of the flow control device 2 and the operation mechanism 3 will be described. When the point fire extinguishing button 15 is pressed, the main valve 22 and the safety valve 21 are opened and fuel gas is supplied to the normal-fire pilot burner BP. At this time, among the first lever 6 and the second lever 7, the first burner B1 and / or the second burner B2 whose levers are set at positions other than the right end position (fire extinguishing) perform the pre-ignition. After the ignition operation, when the first lever 6 and the second lever 7 are set at predetermined positions, the first throttle valve 4 and the second throttle valve 5 are operated via the link mechanism 60 and / or 70, and The first burner B1 and / or the second burner B2 burns at a desired heating power according to the purpose of cooking.

In the thermal power adjusting operation, when either the first lever 6 or the second lever 7 is displaced rightward from the left end position (strong combustion), the needle valve body 41 (51) is moved to the second valve body 48 (58). ) First closes the second valve port 46 (56). This position is the intermediate position (weak combustion) and the orifice 49
The opening degree is only (59) (shown in FIG. 6). As shown in FIG. 8, the O-ring of the first valve body 47 (57) has the first valve port 45,
The first lever 6 or the second lever 6 that closes by contacting the inlet of the valve 55
The setting position of the lever 7 is determined by the lever urging mechanisms F1 and F2.
Are biased toward the intermediate position (weak combustion) side from the set position of the first lever 6 or the second lever 7 at the dead center.

When the fire extinguishing operation is performed by displacing either the first lever 6 or the second lever 7 rightward from the intermediate position (weak combustion) to the right end position (fire extinguishing), the lever urging mechanism F1 or F1 is operated until the dead center. The operation force is relatively large because the spring is displaced against the spring load that is going to return to the intermediate position of F2. When the O-ring comes into contact with the inlets of the first valve ports 45 and 55, the O-ring is deformed when the O-rings are fitted into the inlets of the first valve ports 45 and 55, and the lever urging mechanism F
The operating force is at its maximum since it is made against the bias by 1 or F2. After the O-ring has been fitted into the inlets of the first valve ports 45 and 55, there is sliding frictional resistance, but it is small and moderate compared to the deformation of the O-ring.

The biasing force of the spring applied to the first lever 6 and the second lever 7 increases as the distance from the dead center increases.
As a result, when the first lever 6 and the second lever 7 are released before or after the dead center, the first lever 6 and the second lever 7 are moved to the intermediate position (weak combustion) or It moves to the right end position (fire extinguishing). At this time, the first throttle valve 4 and the second throttle valve 5 are in the minimum opening degree or the closed state, so that the minimum combustion is continued or the fire is extinguished. First lever 6 and second lever 7 at dead center
, The first throttle valve 4 and the second throttle valve 5 are closed at this time even if the first lever 6 and the second lever 7 stop at that position by releasing the operating force from the hand. Because it is safe. Also, in the case of the operation in the reverse direction, the first throttle valve 4 and the second throttle valve 5 are closed at the dead center, so that the set minimum opening degree or less does not occur, which is safe.

When stopping combustion of either the first burner B1 or the second burner B2, the first lever 6 or the second
Set one of the levers 7 to the right end position. By this operation, the needle valve main body 41 (51) causes the first valve body 47 (5)
The O-ring of 7) closes the first valve ports 45, 55. As a result, the supply of fuel gas is cut off and the first burner B1 or the second burner B1 is turned off.
One of the burners B2 extinguishes. Either the first burner B1 or the second burner B2 is in the fire extinguishing position (right end position)
Is set, the quadrant 82 of the selection mechanism 8 rotates, and one edge (84, 85) of the quadrant 82 moves in the moving direction of either the first lever 6 or the second lever 7. Parallel, the other edge (84, 85) is perpendicular to the direction of movement of either the first lever 6 or the second lever 7. This prevents the other one of the first lever 6 and the second lever 7 from being set to the fire extinguishing position.

The lever urging mechanisms F1 and F2 operate as follows. The first lever 6 or the second lever 7 is displaced rightward from the left end position (strong combustion) to the middle position (weak combustion) until it reaches the intermediate position (weak combustion). , Q7 and the engaging pins P6, P7 projecting from the first lever 6 and the second lever 7 do not mesh with each other. The first lever 6 or the second lever 7 is displaced rightward from the intermediate position (weak combustion) to the right end position (fire extinguishing) until it reaches the right end position (fire extinguishing).
Q7 is engaged with the pins P6 and P7, and the rotating pieces 67 and 77
Is rotated while the springs 69 and 79 are extended (opposed to the spring load), and the first fulcrum P1, the pivoting fulcrum 66 and the pivoting fulcrum 76, and the engagement pins P6 and P7 are aligned. After passing the point, the springs 69 and 79 are rotated while being contracted (biased by the spring load).

As a result, the operating force for moving the first lever 6 or the second lever 7 from the intermediate position to the right end position is as follows:
Since the springs 69 and 79 are displaced against the spring load while extending to the dead point, they are large, and become neutral without being affected by the spring load at the dead point. After passing through the dead center, the first lever 6 or the second lever 7 is automatically displaced to the right end position because it is displaced while being urged by the spring loads of the springs 69 and 79. In other words, the first lever 6 or the second lever 7 is urged by the spring force before passing through the dead center and after passing through the dead center in the displacement from the intermediate position to the right end position. It can be automatically displaced to the right end position. Conversely, when displacing from the right end position to the intermediate position, the spring is biased by a spring force before and after passing through the dead center and automatically displaced to one position. Thereby, the first lever 6 or the second lever 6
It is possible to effectively prevent the lever 7 from stopping between the intermediate position and the right end position. At the dead point, the operating piece urging mechanism is neutral, and there is no urging by the spring force in either direction.Therefore, the operating force may be released and the operator may stop at the dead point.
At this time, since the first throttle valve 4 and the second throttle valve 5 are always in the closed state, an opening state smaller than the set minimum opening degree may cause a malfunction such as misfire and release of raw gas. There is no.

The operation mechanism of the present invention can be applied to a flow control device other than the gas equipment.

[Brief description of the drawings]

FIG. 1 is a cross-sectional side view of a main part of a thermal power control device of a gas appliance.

FIG. 2 is a plan view of a main part of a thermal power control device of the gas appliance.

FIG. 3 is a plan view of a main part of the thermal power control device of the gas appliance.

FIG. 4 is a schematic explanatory view of a grill.

FIG. 5 is an explanatory diagram of the operation of an operation piece and a throttle valve.

FIG. 6 is an explanatory view of the operation of the operation piece and the throttle valve.

FIG. 7 is an operation explanatory view of an operation piece and a throttle valve.

FIG. 8 is an explanatory diagram of displacement of an operation piece.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermal power control device of gas equipment 2 Fuel gas control mechanism 3 Operating mechanism 4 First throttle valve 5 Second throttle valve 6 First operating lever 7 Second operating lever 8 Alternative mechanism B1 First burner B2 Second burner BP Pilot burner 60 First link mechanism 70 Second link mechanism G Grill storage F1, F2 Lever (operation piece) biasing mechanism

Claims (3)

(57) [Claims] 1. A throttle valve provided in a fluid supply passage and having a variable valve opening between a maximum valve opening and a valve closing, and closing the throttle valve from a maximum opening to a minimum opening. An operating piece to be operated up to the operating piece, a rotating piece that meshes with the operating piece and rotates, and a spring that has one end locked to the operating piece and the other end locked to the outer side of the rotating piece. In the operation mechanism of the flow rate control device provided with the operation piece urging mechanism, the operation piece initially moves toward the minimum opening position of the spring in the valve closing operation from the minimum opening position of the throttle valve. The spring is displaced against the spring load to be returned, and the spring becomes neutral at the dead point corresponding to the mesh point of the operating piece and the rotating piece, and the operating piece burns after the spring passes through the dead point. Until the stop position is set, the spring is urged toward the combustion stop position by the spring load of the spring, and the throttle valve is closed. Operation mechanism of the flow control apparatus characterized by position was set to the minimum opening position side of the dead center. 2. The throttle valve according to claim 1, wherein the throttle valve starts closing by displacing the valve body by a predetermined distance from the minimum valve opening, and further closing the valve by displacing the valve body by a predetermined distance. An operation mechanism of the flow control device, wherein the operation piece is an operation lever, and the valve element is operated via a link mechanism. 3. The first valve according to claim 2, wherein the throttle valve has a valve hole having a first valve port and a second valve port, and the valve body has an O-ring for opening and closing the first valve port. An orifice that has a body and a second valve body that opens and closes the second valve opening, and that connects the downstream outer periphery of the O-ring and the downstream of the second valve body, respectively, bypassing the second valve body inside; The closing of the valve is in a state where the O-ring is in contact with the inlet of the first valve port, and the closing of the valve is in a state where the O-ring is fitted in the first valve port. An operation mechanism for a flow control device, wherein