JP4420630B2 - Motor valve and gas appliance provided with the motor valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor valve that can be immediately closed when an abnormality such as a power failure occurs, and a gas appliance such as a gas stove equipped with the motor valve.
[0002]
[Prior art]
This type of motor valve has an internal passage and a valve casing having a gas inflow portion and a gas outflow portion communicating with the internal passage. A valve seat is formed in the internal passage, and a valve body is disposed so as to be seated on the valve seat. A drive body that is driven by rotation of a drive shaft of a motor is connected to the valve body. The driving body is provided with a recess, and an adsorbing body made of a magnetic body is inserted through a spring, and a valve body is attached to the adsorbing body. Further, a coil for energizing the adsorbing body to seat the valve body on the valve seat and closing the valve body is fixed to a valve casing around the driving body.
[0003]
When opening the motor valve, the coil is energized to adsorb the adsorbent, and the motor is driven to move the drive to adjust the opening between the valve seat and the valve to adjust the flow rate. To do. If an abnormality such as a power failure occurs, the energization of the coil is stopped by stopping the energization of the coil, and the valve element is securely seated on the valve seat by the biasing force of the spring. (Patent document 1).
[0004]
[Patent Document 1]
JP-A-2-245588 (see, for example, the claims)
[0005]
[Problems to be solved by the invention]
However, the above has poor magnetic efficiency because the magnetic circuit generated by energizing the coil is not closed. For this reason, during the flow control by operating the motor to drive the driving body, it is necessary to flow a large current to attract and hold the adsorbing body on the driving body, resulting in a problem of increased power consumption.
[0006]
Therefore, in view of the above points, the present invention has good magnetic efficiency, and even during the flow rate control by driving the motor valve, it is not necessary to flow a large current to attract and hold the valve body, and the power consumption can be reduced. An object of the present invention is to provide a motor valve and a gas appliance provided with the motor valve.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, a motor valve according to claim 1 is provided with a valve casing having an internal passage, an inflow portion and an outflow portion communicating with the internal passage, and a valve seat formed in the internal passage. The valve body is arranged so as to be seated on the valve seat, and a motor is provided for reciprocating the valve body between the valve opening position and the valve closing position along the internal passage, and the valve body and the motor are adsorbed. In the motor valve that is connected through the means and provided with biasing means for biasing the valve body in the valve seat direction,
It said suction means, and composed of a coil for exciting the magnet pieces and the magnet pieces, the magnet pieces to the magnet pieces, the magnetic circuit when energized the coil for adsorbing the valve body is held in the closed state The coil was energized while being in contact with the valve body, and the magnet piece was connected to the rotating shaft of the motor so that the magnet piece was driven integrally with the valve body attracted to the magnet piece by the motor.
[0008]
According to this, when the motor valve is opened, the coil is energized to excite the magnet piece of the attracting means to attract the valve body to the magnet piece. When the motor is driven, the valve body is moved along the internal passage along with the suction means, the valve body is detached from the valve seat and opened, and the opening between the valve seat and the valve body is adjusted. The flow rate of fluid such as gas is adjusted. In this case, the magnet piece is formed so that the magnetic circuit is held in a closed state when the valve element is attracted by energizing the coil, and the magnet piece adsorbing the valve element is integrated with the valve element by the motor. Therefore, while the motor is driven and the flow rate is controlled, the magnetic circuit is always closed, the magnetic efficiency is good, and a sufficient attracting force can be obtained even when the current supplied to the coil is small. On the other hand, when an abnormality such as a power failure occurs, the energization of the coil is stopped, the adsorption of the valve element is released, and the valve element is seated on the valve seat by the urging force of the spring and is reliably closed. .
[0009]
For example, the tip of the valve body on the valve seat side is preferably a needle shape so that the gas flow rate can be finely adjusted.
[0010]
Further, when the valve body is detached from the adsorption means and is in the closed position, the motor is driven to move the adsorption means to the closed position where the magnet piece contacts the valve body, and the adsorption means is operated to operate the valve. If the body is sucked and held and the valve is opened by driving the motor, the valve body is sucked with a smaller current than when the valve body is sucked against the biasing force of the spring. You can do it.
[0011]
Gas appliance according to claim 3 is provided with the motor valve as claimed in claim 1 or claim 2, and a gas burner in which the fuel gas is supplied through the motor valve, as exposed to the flame of the gas burner A gas appliance provided with a thermocouple, wherein the power for operating the adsorption means is supplied from the power source that operates the gas appliance at the beginning of ignition of the gas burner, and when a predetermined time has elapsed after the gas burner is ignited, the thermocouple It is characterized by switching to an electromotive force generated by exposure to a flame.
[0012]
Thereby, the power consumption of the gas stove can be reduced as compared with the case where the coil is always energized directly from the external power source.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, reference numeral 1 denotes a motor valve according to the present invention. The motor valve 1 is incorporated as a gas cooking appliance in a gas stove 2 installed in kitchen furniture provided in a kitchen, for example. The gas stove 2 provided with a microcomputer (not shown) for controlling the operation of the instrument has a box-shaped instrument body, and the instrument body is provided with a gas burner 21 so as to face an opening provided on a top plate covering the upper surface thereof. It has been. A thermocouple 22 is also arranged in the instrument body so as to be exposed to the flame of the gas burner 21. The supply of fuel gas to the gas burner 21 is adjusted by the motor valve 1.
[0014]
The motor valve 1 includes an internal passage 11a extending in the vertical direction, and includes a valve casing 11 having a fuel gas inflow portion 12 and an outflow portion 13 communicating with the internal passage 11a. A valve seat 14 is formed in the internal passage 11a, and the valve body 3 is disposed in the internal passage 11a so as to be seated on the valve seat 14. The valve body 3 has a shaft portion 31 extending along the longitudinal direction of the internal passage 11a, and the shaft portion 31 on the valve seat 14 side (lower side in FIG. 1) has a concave cross-section seated on the valve seat 14. The valve part 32 is attached. A needle-shaped needle portion 33 that can be inserted into a valve hole 13 a formed in the outflow portion 13 is fitted in the central recess of the valve portion 32. As a result, the gas flow rate can be finely adjusted. Moreover, the needle part 33 is changed according to the gas type to be used.
[0015]
In order to reciprocate the valve body 3 along the internal passage 11a, a stepping motor (hereinafter referred to as “motor”) is provided at the upper surface opening of the valve casing 11 facing the gas outflow portion 13 via a lid member 4 that seals the internal passage 11a. 5) is attached, and the rotating shaft 51 of the motor 5 passes through the lid member 4 and protrudes into the internal passage 11a. The rotating shaft 51 and the valve body 3 are connected via an attracting means 6 having a coil and a magnet piece, which will be described later, so that the motor valve 1 can be closed when an abnormality such as a power failure occurs. In this case, for the gas flow rate adjustment by the motor valve 1, the magnetic efficiency is poor unless the magnetic circuit generated by energizing the coil is closed while the motor 5 is driven, and the motor valve 1 is driven to control the flow rate. In order to hold the valve body 3 by suction, it is necessary to pass a large current through the coil, which increases power consumption.
[0016]
In the present embodiment, the attracting means 6 has a base portion 61 connected to the rotating shaft 51 of the motor 5, and an inverted U-shaped magnet piece 62 is mounted on the valve seat side of the base portion 61. ing. A coil 63 is wound around one arm portion 62a of the arm portions 62a extending downward from the magnet piece 62. In addition, an armature 64 is integrally attached to the end of the valve shaft 31 facing the front end surface of each arm 62a. When the coil 63 is energized to excite the magnet piece 62, the armature 64 is attracted to the tip surface of each arm portion 62 a of the magnet piece 62. In this case, the magnet piece 62 and the armature 64 are in contact with each other so that the magnetic gap becomes zero.
[0017]
Thus, when the coil 63 is energized and the armature 64 is attracted to the magnet piece 62, the magnetic circuit is closed, and when the valve body 3 is attracted to the magnet piece 62 and driven by the motor 5, it is mounted on the base 61. The magnet piece 62 reciprocated integrally with the valve body 3. Therefore, while the motor valve 1 is opened and the gas flow rate is adjusted, the magnetic circuit is always kept closed, the magnetic efficiency is good, and the magnetic gap between the magnet piece 62 and the armature 64 is set to zero. In combination, even if the energization current to the coil 63 is very small, a sufficient attracting force can be obtained and the power consumption can be reduced.
[0018]
A guide member 65 is attached to the base portion 61 so as to surround the shaft portion 31 of the valve body 3 that reciprocates in the internal passage 11a, and the needle portion 33 of the valve body 3 is inserted into the valve hole 13a by the guide member 65. It is prevented from tilting. The electrical board M and the coil 63 are connected via a connector part 66 provided in the valve casing 11, and the connector part 66 and one end of the coil 63 are connected via an electric wire W. In this case, the electric wire W is composed of a flexible and durable stranded wire or a flexible circuit so as not to be affected by the reciprocation caused by the rotation of the motor 5. Further, the other end of the coil 63 is connected to the base portion 61, and a ground structure is formed in which a potential is transmitted from the base portion 61 to the lid member 4 through the rotating shaft 51.
[0019]
Further, a spring 7 is contracted between the valve body 3 and the base portion 61, and when an abnormality such as a power failure occurs due to the spring 7, the energization to the coil 63 is stopped, so that the adsorption means 6 The valve body 3 is released from the suction, and the urging force of the spring 7 causes the valve body 3 to be seated on the valve seat 14 and to be reliably closed. In this case, when the valve body 3 is moved to the valve closing position by the urging force of the spring 7 and then the motor valve 1 is operated again to open the valve, the motor 5 is driven and the adsorption means 6 is connected to the magnet piece 62 and the armature. The valve body 3 is moved to a valve closing position in contact with 64, the coil 63 of the suction means 6 is energized to hold the valve body 3 by suction, and then the motor 5 is driven to open the valve body 3. Like to do. Thereby, compared with the case where the valve body 3 is adsorbed against the biasing force of the spring 7, the valve body 3 can be adsorbed with a small current.
[0020]
The energizing current to the coil 63 is supplied from the external power source (not shown) that operates the gas burner 21 and the motor 5 through the electric board M provided on the gas stove 21 at the beginning of ignition of the gas burner 21, and the gas burner 21 is ignited. After a predetermined time has elapsed, the microcomputer is switched to an electromotive force generated by exposing the thermocouple 22 to a flame. In this case, the electrical board M is provided with a switching element (not shown) such as a transistor, receives the output from the microcomputer, and switches from the external power source to the electromotive force of the thermocouple 22 and holds it. Thereby, the power consumption of the gas stove 2 can be reduced as compared with the case where the coil 63 is always energized directly from the external power source.
[0021]
Further, when an abnormality such as a power failure occurs, the power supply to the microcomputer is stopped, and the switching element is switched again to stop the power supply to the coil 63. The suction of the valve element 3 is released and the valve is reliably closed. The On the other hand, when boiling occurs during cooking and the flame of the gas burner 21 is extinguished, the electromotive force from the thermocouple 22 disappears, and the adsorption of the valve body 3 is released, so that the valve is reliably closed. For this reason, live gas is not released from the gas burner 21 when an abnormality occurs. In this case, as the material of the thermocouple 22, it is preferable to use a material having a high thermoelectric exchange rate and a large generated electromotive force, for example, iron silicide powder.
[0022]
Next, the operation of the gas stove 2 provided with the motor valve 1 of the present invention will be described with reference to FIG. When the motor 5 is driven to ignite the gas burner 21 from the position shown in FIG. 2A and the motor valve 1 is opened, the coil 63 is energized by energizing the coil 63 from the external power source through the electrical board M. Energized to attract the armature 64 at the upper end of the valve body 3 to the magnet piece 62. When the motor 5 is driven to move the valve body 3 together with the suction means 6 in the valve opening direction (upward in FIG. 1), the valve body 3 is opened away from the valve seat 14, and the gas burner 21 is opened. Fuel gas is supplied (see FIG. 1).
[0023]
When the gas burner 21 is ignited, the thermocouple 22 is heated by being exposed to the flame of the gas burner 21 to generate an electromotive force. When a predetermined time has elapsed since the ignition of the gas burner 21, the current supplied to the coil 63 via the electrical board M is switched from the external power source to the electromotive force from the thermocouple 22 by the microcomputer. And while using the gas stove 2, the motor 5 is controlled and the gas flow rate to the gas burner 21 is adjusted according to the space | interval between the valve body 3 and the valve seat 14 (refer FIG.2 (b)).
[0024]
For example, when an abnormality such as a power failure occurs, the energization to the microcomputer is stopped, the switching element is switched again, the energization to the coil 63 is stopped, the adsorption of the valve body 3 is released, and the spring 7 Due to the urging force, the valve body 3 is seated on the valve seat 14 and reliably closed (see FIG. 2C). On the other hand, when the cooking of the gas burner 21 is extinguished during cooking, the energization of the coil 63 is stopped and the valve is closed.
[0025]
Next, when the valve body 3 is seated on the valve seat 14 due to the occurrence of an abnormality and the abnormality is released and the motor valve 1 is operated again to open the valve, the motor 5 is first driven. The attracting means 6 is moved to the valve closing position where the magnet piece 62 and the armature 64 are in contact (see FIG. 2A). Then, the coil 63 is energized to excite the magnet piece 62, the armature 64 at the upper end of the valve body 3 is attracted and held by the magnet piece 62, and then the motor 5 is driven to open the valve body 3.
[0026]
In addition, the form of the motor valve 1 of the present invention is not limited to that described above, and an electromagnetic valve E that is an on-off valve may be provided in the gas outflow portion 13 as shown in FIG. Further, in the present embodiment, the coil 63 is provided on one arm portion 62a of the magnet piece 62. However, as shown in FIG. 4, coils 63a and 63b may be provided on both arm portions 62a.
[0027]
【The invention's effect】
As described above, the motor valve of the present invention has good magnetic efficiency, and even during the flow rate control by driving the motor valve, it is not necessary to pass a large current to attract and hold the valve body, and power consumption is reduced. There is an effect that it can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing the configuration of a gas stove equipped with a motor valve of the present invention. FIG. 2 is a cross-sectional view for explaining the operation of a motor valve. FIG. 4 is a sectional view of the motor valve. FIG. 4 is a diagram for explaining another modification of the suction means.
DESCRIPTION OF SYMBOLS 1 Motor valve 11a Internal passage 14 Valve seat 3 Valve body 6 Adsorption means 62 Magnet piece 63 Coil 64 Armature

Claims (3)

It has an internal passage, and has an inflow portion and an outflow portion communicating with the internal passage, and a valve casing having a valve seat formed in the internal passage, and a valve body is disposed so as to be seated on the valve seat, A motor is provided for reciprocating the valve body between the valve opening position and the valve closing position along the passage, the valve body and the motor are connected via an adsorbing means, and the valve body is biased in the valve seat direction. In a motor valve provided with a biasing means,
The attracting means is composed of an inverted U-shaped magnet piece and a coil for exciting the magnet piece, and the magnet piece is not energized when the coil is attracted by energizing the coil. in the magnetic circuit is brought into contact with the valve body magnet pieces to be held in the closed state, the end surfaces of the magnet pieces starts energizing the coil in contact with the valve body, the magnet pieces of the motor shaft The motor valve is characterized in that the magnet piece is driven integrally with the valve body adsorbed to the magnet piece by the motor.     The motor valve according to claim 1, wherein a tip of the valve body on a valve seat side has a needle shape.     A gas appliance comprising the motor valve according to claim 1 and a gas burner to which fuel gas is supplied via the motor valve, and provided with a thermocouple so as to be exposed to a flame of the gas burner. When the gas burner is initially ignited, a power source for operating the gas appliance is supplied from the power source for operating the gas burner. A gas appliance characterized by switching to electric power.

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