JP2019011908A - Combustion gas amount control device - Google Patents

Abstract

To provide a combustion gas amount control device which can inhibit an increase of torque of a driving motor.SOLUTION: A combustion gas amount control device A includes: a housing 10 formed with a gas passage 3; a safety valve 4; a gas flow adjustment valve (needle valve) 6 which adjusts a flow rate of combustion gas and interrupts flow of the combustion gas; a safety valve rod 21 which mechanically moves the safety valve in a valve opening direction; a gas flow adjustment valve rod 22 which mechanically moves the gas flow adjustment valve in a valve opening direction; a cam body 20 which rotates to push the safety valve rod and the gas flow adjustment valve rod; and a motor 30 which rotates the cam body. The safety valve rod, the gas flow adjustment valve rod, and the cam body are disposed in the gas passage, and the motor is disposed outside the housing. A connection shaft 33 which rotates the cam body is disposed so as to penetrate through the housing. A space between the housing and the connection shaft is sealed by a seal member 34.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to a gas amount control device, and more particularly to a combustion gas amount control device used in a gas cooker or the like.

  For example, in gas cookers such as gas stoves and gas grills, a combustion gas amount control device that controls the flow rate of combustion gas (fuel gas) is used to adjust the amount of heating during cooking.

  As one of such combustion gas amount control devices, Patent Document 1 discloses a motor-driven combustion gas capable of realizing a gas valve that achieves both automation and safety of combustion equipment such as a gas stove. A quantity control device is disclosed.

  The combustion gas amount control device of Patent Document 1 is significant in that it can be opened and closed and the flow rate adjustment valve can be driven while controlling costs by being driven by a single motor.

  Further, in the combustion gas amount control device of Patent Document 1, the flow rate adjusting valve has a closing function.

  In addition, a safety valve and a flow control valve with a closing function are arranged in series in the gas passage, and consideration is given to shut off the gas twice during standby (when operation is stopped), improving safety. It has been.

  Further, when the safety valve is operated to be forcibly opened, the flow regulating valve is kept in the closed state so that the raw gas does not flow out even if the driving means fails.

  In addition, the flow adjustment valve opens during combustion, but at this time, the safety valve is configured not to be forcibly opened. Even if a combustion device such as a gas stove is extinguished in this state, the safety valve Since the safety valve is configured to close by releasing the adsorption, the outflow of the raw gas is prevented and the safety is ensured.

  Further, in the combustion gas amount control device of Patent Document 1, by using a needle type adjustment valve as a flow rate adjustment valve, the flow rate of the combustion gas can be adjusted continuously rather than stepwise. It is configured.

JP 05-113215 A

  However, in the combustion gas amount control device of Patent Document 1 described above, a part for sealing the gas passage and the outside by the O-ring exists in each of the safety valve and the flow rate adjustment valve, Due to the sliding resistance, there is a problem that the torque that the driving motor should have is increased.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a combustion gas amount control device capable of suppressing an increase in torque of a driving motor.

In order to achieve the above object, the combustion gas amount control device of the present invention comprises:
A housing including a gas inlet and a gas outlet, in which a gas passage extending from the gas inlet to the gas outlet is formed;
A safety valve that is disposed in the gas passage and switches between the flow and shut-off of the combustion gas in the gas passage;
A first spring that urges the safety valve in a valve closing direction;
A gas flow rate adjusting valve arranged in the gas passage and configured to adjust the flow rate of the combustion gas in the gas passage and to block the flow of the combustion gas in the gas passage; ,
A second spring for urging the gas flow rate adjusting valve in the valve closing direction;
A safety valve rod that contacts the safety valve and mechanically moves the safety valve in a valve opening direction against the biasing force of the first spring;
A rod for gas flow rate adjustment valve that abuts against the gas flow rate adjustment valve and mechanically moves the gas flow rate adjustment valve in the valve opening direction against the biasing force of the second spring;
A cam body that pushes and operates the safety valve rod and the gas flow rate adjusting valve rod by rotating;
A combustion gas amount control device comprising: a motor for rotating the cam body;
The safety valve rod, the gas flow rate adjusting valve rod, and the cam body are disposed in the gas passage;
The motor is disposed outside the casing in which the gas passage is formed, and
A connecting shaft that is rotationally driven by the motor and rotates the cam body is disposed so as to penetrate the housing,
The space between the casing and the connecting shaft is sealed by a sealing member.

  The combustion gas amount control device of the present invention is configured as described above, and the safety valve rod, the gas flow rate adjusting valve rod, and the cam body are disposed in the gas passage, and the motor is the gas passage. A connecting shaft that is disposed in the housing at a predetermined outer position and is rotationally driven by a motor and that rotates the cam body is disposed so as to penetrate the housing. And the connecting shaft are sealed by a sealing member, so that the movable part that needs to be sealed between the gas passage inside the housing and the outside of the housing Only the part where the shaft penetrates the housing. As a result, the sliding resistance when rotating the connecting shaft is reduced, and the magnitude of torque required for the driving motor can be reduced.

  In addition, since the motor is disposed outside the housing, that is, outside the gas passage, the housing can be reduced in size, and the manufacturing cost can be reduced.

It is a figure which shows the combustion gas quantity control apparatus concerning embodiment of this invention, Comprising: It is principal part sectional drawing which shows the combustion gas quantity control apparatus in a valve closing state. It is a figure which shows the combustion gas quantity control apparatus concerning embodiment of this invention, Comprising: It is a figure which shows the combustion gas quantity control apparatus in a valve opening state (maximum flow rate valve opening state (fully opened state)). It is a figure which shows the gas control apparatus for combustion concerning embodiment of this invention, Comprising: It is a figure which shows a valve opening state (minimum flow rate valve opening state). It is a figure which shows the gas amount control apparatus for combustion concerning embodiment of this invention, Comprising: It is a figure which shows the state being valve-closed. It is principal part sectional drawing which shows the site | part which seals a gas passage and the exterior of the combustion gas quantity control apparatus concerning embodiment of this invention. It is a figure which shows the phase (angle | corner) of a cam body, the state of a gas flow rate adjustment valve, and a safety valve of the combustion gas amount control apparatus concerning embodiment of this invention.

  Hereinafter, the embodiment of the present invention will be shown and the features thereof will be described in more detail.

[Embodiment]
1A, FIG. 1B, FIG. 1C, and FIG. 1D are cross-sectional views of relevant parts showing a combustion gas amount control device A according to an embodiment of the present invention.

  The combustion gas amount control device A according to the present embodiment is used as a device for controlling the flow of combustion gas (fuel gas) serving as fuel for gas appliances such as gas stoves, gas grills, and gas water heaters. is there. Hereinafter, the configuration will be described with reference to FIGS. 1A, 1B, 1C, 1D, and 2. FIG.

<Configuration of combustion gas amount control device>
The combustion gas amount control device A includes a housing 10 having a gas inlet 1 and a gas outlet 2 and having a gas passage 3 extending from the gas inlet to the gas outlet.

  In the gas passage 3, a safety valve 4 that switches between the flow and shut-off of the combustion gas in the gas passage 3 and a first spring 11 that biases the safety valve 4 in the valve closing direction are disposed. The safety valve 4 is configured such that the valve body 4a is adsorbed and held by energizing a coil (not shown) provided in the safety valve 4.

  Further, in the gas passage 3, a gas flow rate adjustment valve configured to adjust the flow rate of the combustion gas in the gas passage 3 and to block the flow of the combustion gas in the gas passage 3 ( Needle valve) 6 and a second spring 12 for urging the gas flow rate adjusting valve 6 in the valve closing direction.

  Further, in the gas passage 3, a safety valve rod 21 is provided that contacts the safety valve 4 and mechanically moves the safety valve 4 in the valve opening direction against the urging force of the first spring 11.

  Further, in the gas passage 3, a gas that contacts the gas flow rate adjustment valve (needle valve) 6 and mechanically moves the gas flow rate adjustment valve 6 in the valve opening direction against the urging force of the second spring 12. A flow regulating valve rod (needle valve rod) 22 is provided.

  Further, a cam body 20 is disposed in the gas passage 3 to push and operate the safety valve rod 21 and the gas flow rate adjusting valve rod (needle valve rod) 22 by rotating.

  In the combustion gas amount control apparatus A according to this embodiment, a motor (in this embodiment, a gear motor) 30 (see FIG. 2) for rotating the cam body 20 is provided in a housing in which the gas passage 3 is formed. Arranged outside the body 10.

  More specifically, the motor (gear motor) 30 is disposed at a predetermined position outside the housing 10 with the outer wall 10a of the housing 10 interposed therebetween.

  A connecting shaft (rotating shaft) 33 that is rotationally driven by the motor (gear motor) 30 and rotates the cam body 20 is disposed so as to penetrate the housing 10, and between the housing 10 and the connecting shaft 33. Is sealed by a sealing member (O-ring in this embodiment) 34.

  Specifically, the connecting shaft 33 is disposed so as to pass through the through hole 32 a of the motor mounting member 32 constituting a part of the housing 10, and between the through hole 32 a of the motor mounting member 32 and the connecting shaft 33. Is sealed by a sealing member (O-ring in this embodiment) 34.

As described above, the combustion gas amount control device of the present invention is
(A) While the safety valve rod 21, the gas flow rate adjusting valve rod (needle valve rod) 22, and the cam body 20 are all disposed in the gas passage 3,
(B) A motor (gear motor) 30 for rotating the cam body 20 is disposed outside the housing 10 in which the gas passage 3 is formed.
(C) A connecting shaft 33 that is rotationally driven by a motor (gear motor) 30 and rotates the cam body 20 is disposed so as to penetrate the housing 10, and a seal is provided between the housing 1 and the connecting shaft 33. A point sealed by a member (O-ring) 34,
Are the characteristic configuration of the combustion gas amount control apparatus A according to the present invention.

  The combustion gas amount control device A according to the present embodiment is configured as described above, and the safety valve rod 21, the needle valve rod 22, and the cam body 20 are all disposed in the gas passage 3. Therefore, the movable part that needs to seal the gas passage 3 and the outside by the seal member (O-ring) 34 is provided between the connecting shaft 33 and the through hole 32a of the motor mounting member 32 constituting the housing 10. , That is, only the position where the O-ring 34 is disposed, the sliding resistance when the connecting shaft 33 is rotated is reduced, and the magnitude of torque required for the motor (gear motor) 30 is reduced. It becomes possible to do.

  The combustion gas amount control device A according to the embodiment of the present invention will be further described.

  This combustion gas amount control device A includes a safety valve 4 in which a valve body 4a is adsorbed and held by energization of a coil (not shown), and a gas flow rate adjustment valve (needle) that adjusts the flow rate of the flowing combustion gas. 6) are arranged in series (FIGS. 1A, 1B, 1C, 1D).

  The gas flow rate adjusting valve (needle valve) 6 is a needle-type valve that advances and retreats the needle. The gas flow rate adjusting valve (needle valve) 6 has an adjustment function that continuously adjusts the flow rate of the flowing combustion gas instead of stepwise. It has a closing function to shut off combustion gas.

  The safety valve rod 21 and the gas flow rate adjusting valve rod (needle valve rod) 22 are moved forward and backward by the rotation of the cam body 20 driven by the motor (gear motor) 30, and the safety valve 4 and the gas flow rate adjusting valve (needle valve). ) 6 is driven in the opening direction and in the closing direction.

  The safety valve 4 is configured to close when the coil (not shown) is de-energized in a state where the cam body 20 rotates and the safety valve rod 21 does not mechanically open the safety valve 4. Has been.

  Further, the connecting shaft 33 that is rotationally driven by the motor (gear motor) 30 and rotates the cam body 20 is disposed so as to penetrate the motor mounting member 32 that constitutes a part of the housing 10 as described above. The space between the through hole 32a of the motor mounting member 32 and a connecting shaft 33 constituting a part of the housing 10 is sealed by an O-ring (seal member) 34 (see FIG. 2).

  The safety valve 4 is a first spring 11 and the gas flow rate adjustment valve (needle valve) 6 is a second spring 12 and is energized in the valve closing direction, respectively. 11 and the urging force of the second spring 12 ensures that the valve is closed, ensuring high safety.

The motor (gear motor) 30 has a built-in potentiometer (not shown).
(A) The origin at which the safety valve 4 and the gas flow rate adjustment valve (needle valve) 6 block combustion gas, for example, the position of θ = 0 ° in FIG.
(B) a position where the safety valve 4 is in the open position and the gas flow rate adjusting valve (needle valve) 6 is in the maximum opening position (maximum heating power position), for example, the position θ = + 90 ° in FIG.
(C) a position where the safety valve 4 is in the open position and the gas flow rate adjustment valve (needle valve) 6 is in the minimum opening position (minimum heating power position), for example, the position of θ = + 60 ° in FIG.
(D) Combustion gas flow start position (that is, the same position as the minimum opening position (minimum thermal power position) in FIG. 1C),
The position information of the motor (gear motor) 30 such as the above can be detected.

<Operation of Combustion Gas Quantity Control Device>
In this specification, the normal rotation of the motor (gear motor) 30 refers to the rotation direction of the motor when the cam body 20 rotates clockwise (CW) in FIG. 1A. Further, the reverse rotation of the motor (gear motor) 30 refers to the rotation direction of the motor when the cam body 20 rotates counterclockwise (CCW) in FIG. 1A.

  In this combustion gas amount control device A, the phase of the cam body 20 during standby for shutting off the combustion gas is the origin (θ = 0 °), and the safety valve rod 21 and the needle valve rod 22 are respectively The safety valve 4 and the gas flow rate adjustment valve (needle valve) 6 are not pushed, and both the safety valve 4 and the gas flow rate adjustment valve (needle valve) 6 are in a closed state that shuts off the gas flow. (See FIGS. 1A and 3).

  Next, when starting the flow of the combustion gas, as shown in FIG. 1D, the motor (gear motor) 30 rotates reversely, the phase of the cam body 20 becomes θ = −45 °, and the cam body 20 Presses the safety valve rod 21. As a result, the safety valve rod 21 comes into contact with the safety valve 4 and mechanically forcibly opens the safety valve 4.

  In this state, when a coil (not shown) provided in the safety valve 4 is energized, the safety valve 4 is adsorbed and held, and the safety valve 4 is kept open.

  As described above, after the safety valve 4 is attracted and held by energizing the coil, the motor (gear motor) 20 is rotated forward, and when the energization to the coil is interrupted, the safety valve 4 is closed. To the original position (= origin) of the cam body 20, and the safety valve rod 21 returns to the standby position. In addition, the safety valve 4 is maintaining the valve open state by energizing the coil.

  After the cam body 20 returns to the origin, the motor (gear motor) 30 is further rotated forward, the cam body 20 comes into contact with and pushes against the gas flow rate adjusting valve rod (needle valve rod) 22, and the needle valve rod 22 The gas flow rate adjustment valve (needle valve) 6 is pushed, and the gas flow rate adjustment valve (needle valve) 6 is gradually opened (see FIGS. 1C, 1B, and 3). 1C shows the state of the minimum opening, and FIG. 1B shows the state of the maximum opening.

  The state shown in FIGS. 1C and 1B (that is, the state where the phase θ of the cam body 20 is on the plus side) is such that the safety valve 4 is closed when power to a coil (not shown) included in the safety valve 4 is cut off. This is a state to be performed (see FIG. 3).

  Thereafter, while detecting the phase of the cam body 20 with a potentiometer, the position of the gas flow rate adjustment valve (needle valve) 6 is the minimum opening position (FIG. 1C) and the maximum opening position (fully opened) (FIG. 1B). The flow rate of the combustion gas is adjusted by controlling the rotation of the motor (gear motor) 30 so as to be in the range.

  In the combustion gas amount control apparatus A according to the present embodiment, the flow of the combustion gas is blocked in a state where the combustion gas is flowing (that is, the phase θ of the cam body 20 is on the plus side). At that time, by shutting off the power supply to the coil of the safety valve, the safety valve is closed and the motor (gear motor) 30 is reversely rotated to bring the cam body 20 to the position of the origin (θ = 0 °). By returning, the gas flow rate adjusting valve rod (needle valve rod) 22 is retracted, and the gas flow rate adjusting valve (needle valve) 6 is closed.

  In this state, both the safety valve 4 and the gas flow rate adjustment valve (needle valve) 6 are in a double shut-off state of the gas passage 3 that shuts off the flow of the combustion gas, and high safety is ensured.

  Here, although a part of the above description is overlapped, the state of the gas flow rate adjustment valve and the safety valve will be described with reference to FIG. 3 showing the phase (angle) of the cam body 20 and the state of the gas flow rate adjustment valve and the safety valve. .

  As shown in FIG. 3, when the phase θ of the cam body 20 is at the origin (θ = 0 °), the safety valve 4 is closed when the coil (not shown) is not energized, and the gas flow rate is adjusted. The valve (needle valve) 6 is also fully closed.

  Further, as shown in FIG. 3, when the cam body 20 rotates clockwise and the phase θ increases in the positive direction from the origin (θ = 0 °), the gas flow rate adjustment valve (needle valve) 6 gradually increases. In this embodiment, when the phase θ reaches + 90 °, the gas flow rate adjustment valve (needle valve) 6 is fully opened. On the other hand, the safety valve 4 is in a closed state when the power supply to the coil is interrupted, and is in a state in which the safety valve 4 can be opened when power is supplied to the coil.

  As shown in FIG. 3, when the cam body 20 rotates counterclockwise and the phase θ increases from the origin (θ = 0 °) in the negative direction, the gas flow rate adjustment valve (needle valve) 6 While the valve is kept closed, the safety valve 4 is gradually opened, and the valve is opened even when the coil (not shown) is not energized. By energizing the coil in this state, the safety valve 4 is kept open regardless of the phase of the cam body 20.

  Incidentally, in the combustion gas amount control apparatus A according to the present embodiment, the safety valve 4 and the gas flow rate are cut off when the energization of the coil included in the safety valve 4 is cut off regardless of the phase of the cam body 20. Since at least one of the regulating valves (needle valve) 6 blocks the flow of the combustion gas, the flow of the combustion gas is blocked even during a power failure, and a safe combustion gas amount control device is realized. be able to.

  Since the combustion gas amount control device A according to the present embodiment is configured as described above, the cam body 20 is rotated to cause the safety valve rod 21 and the gas flow rate adjusting valve rod (needle valve rod). By operating the cylinder 22 in a predetermined direction, the combustion gas can be passed at an intended flow rate. When the combustion gas flow is shut off, the combustion gas flow is performed as necessary. Can be reliably shut off.

  Further, in the combustion gas amount control device A according to the present embodiment, the safety valve rod 21, the gas flow rate adjusting valve rod (needle valve rod) 22, and the cam body 20 are arranged in the gas passage 3. A motor (gear motor) 30 is disposed outside the gas passage 6, and a motor (gear motor) 30 that rotates the cam body 20 is disposed outside the housing 10. A space between the penetrating connecting shaft 33 and the housing 10 is sealed by a seal member (O-ring) 34.

  Therefore, the part that needs to be sealed between the outside of the housing 10 and the gas passage 3 inside thereof is only the part where the connecting shaft 33 penetrates the housing 10, and the connecting shaft 33 rotates. Therefore, the combustion gas amount control device capable of reducing the magnitude of torque required for the drive motor (gear motor) 30 can be realized.

  Further, since the sliding resistance when the connecting shaft 33 is rotated is reduced, the position of the motor (gear motor) 30 is closed to shut off the flow of the combustion gas after the start of the flow of the combustion gas. It is possible to reduce the torque of the motor (gear motor) 30 when returning to the state.

  Further, when the gas flow rate adjustment valve (needle valve) 6 is opened, the gas flow rate adjustment valve (needle valve) 6 gradually shifts from the closed state to the open state, and the flow rate of the combustion gas that flows therethrough. However, since it gradually increases from a small flow rate to a large flow rate, it is possible to prevent explosive ignition.

  Further, since the motor (gear motor) 30 is disposed outside the housing 10, that is, outside the gas passage 3, the housing 10 in which the gas passage 3 is formed can be downsized. Thus, the manufacturing cost can be reduced.

  The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.

A Combustion gas amount control device 1 Gas inlet 2 Gas outlet 3 Gas passage 4 Safety valve 4a Valve element 6 Gas flow rate adjustment valve (needle valve)
DESCRIPTION OF SYMBOLS 10 Housing | casing 10a Outer wall of 11 Housing | casing 11 1st spring 12 2nd spring 20 Cam body 21 Rod for safety valve 22 Rod for gas flow regulating valve (rod for needle valve)
30 Motor (gear motor)
32 Motor mounting member 32a Through hole 33 Connecting shaft (rotating shaft)
34 Seal member (O-ring)

Claims (1)

A housing including a gas inlet and a gas outlet, in which a gas passage extending from the gas inlet to the gas outlet is formed;
A safety valve that is disposed in the gas passage and switches between the flow and shut-off of the combustion gas in the gas passage;
A first spring that urges the safety valve in a valve closing direction;
A gas flow rate adjusting valve arranged in the gas passage and configured to adjust the flow rate of the combustion gas in the gas passage and to block the flow of the combustion gas in the gas passage; ,
A second spring for urging the gas flow rate adjusting valve in the valve closing direction;
A safety valve rod that contacts the safety valve and mechanically moves the safety valve in a valve opening direction against the biasing force of the first spring;
A rod for gas flow rate adjustment valve that abuts against the gas flow rate adjustment valve and mechanically moves the gas flow rate adjustment valve in the valve opening direction against the biasing force of the second spring;
A cam body that pushes and operates the safety valve rod and the gas flow rate adjusting valve rod by rotating;
A combustion gas amount control device comprising: a motor for rotating the cam body;
The safety valve rod, the gas flow rate adjusting valve rod, and the cam body are disposed in the gas passage;
The motor is disposed outside the casing in which the gas passage is formed, and
A connecting shaft that is rotationally driven by the motor and rotates the cam body is disposed so as to penetrate the housing,
A combustion gas amount control device characterized in that a gap between the casing and the connecting shaft is sealed by a seal member.

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