JP2008138702A - Method for controlling motor safety valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that attraction force of the electromagnet 4 gets weak and a motor safety valve 1 gets not to easily open when dust is caught on a magnetic pole 4a of the electromagnet 4 and an upper surface 33a of the armature 33 in the motor safety valve 1 opening a valve port 23 by attracting an armature 33 by an electromagnet 4 and pulling up a valve element 3 connected to the armature 33. <P>SOLUTION: Stroke of the valve element 3 energized by a spring 31 when the valve element 3 closes is kept large to generate large impact on the valve element 3 when the valve element 3 closes the valve port 23. The vibration is transmitted to the armature 33 via a valve stem 32 to drop dust on the upper surface 33a. Also, dust adhering on the magnetic pole 4a is dropped by applying vibration on the electromagnet 4 by making a lifting member 40 butt on a stopper 71 and making the same step out. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for controlling a motor safety valve that is attached in the middle of a fluid supply pipe and opens and closes the supply pipe.

  This type of conventional motor safety valve is interposed in a supply pipe for supplying a liquid such as water or a gas such as city gas as a fluid, and closes the supply pipe or increases or decreases the opening degree. It is used.

  The structure of the motor safety valve includes a valve body that is urged in a direction in which the supply pipe is normally closed, and a motor mechanism that advances and retracts an electromagnet that attracts an armature provided on the valve body. Then, the motor mechanism is operated to move the electromagnet to a position where the electromagnet comes into contact with the armature. In this state, the electromagnet is excited to attract the armature to the electromagnet.

The motor mechanism is operated in the reverse direction while the armature is attracted to the electromagnet, and the electromagnet is returned while the armature is attracted. Then, the valve body moves in the valve opening direction against the urging force, and the valve closing state of the supply pipe is released (see, for example, Patent Document 1).
JP-A-2-245588 (FIG. 1)

  In order to excite the electromagnet, it is necessary to energize the electromagnet. However, since it is necessary to continue energization while the valve is open, it is desirable from the viewpoint of energy saving that the current value supplied to the electromagnet is as small as possible. In particular, when an electromagnet is excited using a dry battery as a power source, if the current value to be energized is large, the battery life is shortened. Therefore, it is desirable to reduce the current value.

  However, when the current value is reduced, the attracting force of the electromagnet is reduced, so that the electromagnet becomes difficult to attract the armature. In particular, if dust such as dust is caught between the armature and the magnetic pole of the electromagnet, the armature and the magnetic pole of the electromagnet do not sufficiently adhere to each other, and if the current value is small, the valve body cannot be moved in the valve opening direction. A malfunction occurs.

  In view of the above problems, an object of the present invention is to provide a method for controlling a motor safety valve that can be removed even if dust adheres to the magnetic poles of an electromagnet or the surface of an armature.

  In order to solve the above problems, a motor safety valve control method according to the present invention includes a motor safety valve interposed in the middle of a fluid supply pipe, and a valve body biased in a direction to normally close the supply pipe. A motor safety valve having a motor mechanism for moving an electromagnet that adsorbs an armature provided on a valve body to move back and forth, and at least one of the electromagnet and the armature is vibrated in a state where the electromagnet and the armature are separated from each other. It is characterized by removing dust adhering to the surface.

  If vibration is applied to the electromagnet or the armature while the electromagnet and the armature are separated from each other, even if dust is attached to the surface, the dust is dropped and removed from the surface by the vibration.

  In order to remove dust adhering to the armature, the electromagnet can be moved from the state where the armature is attracted to the electromagnet and the valve body is opened to the state where the valve body is moved further in the valve opening direction than the fully opened position. The adsorbing force is extinguished and the valve body is closed by the urging force so that the armature is vibrated.

  In order to remove dust adhering to the electromagnet, the motor mechanism is a stepping motor, and a stopper is provided to restrict the movement of the electromagnet in the valve opening direction, and the movement of the electromagnet is regulated by the stopper. What is necessary is just to give a vibration to the electromagnet by stepping out the stepping motor.

  In addition, about the frequency of the pulse signal input to the stepping motor, strong vibration can be generated if the frequency at the time of step-out is lower than the frequency during other operation.

  As is clear from the above description, the present invention can remove the dust adhering to the surface by applying vibration to the electromagnet and the armature. Even if it becomes weak, it is possible to remove the dust and restore the adsorption power.

  Referring to FIG. 1, reference numeral 1 denotes a motor safety valve according to the present invention. In this embodiment, 1 is incorporated in a gas stove and attached to a gas supply pipe for supplying gas to a gas burner (not shown). The motor safety valve 1 is provided with an inflow portion 21 through which gas flows from the upstream of the gas supply pipe and an outflow portion 22 through which gas flows out to a gas burner connected downstream of the gas supply pipe.

  A valve port 23 is formed between the inflow portion 21 and the outflow portion 22, and a valve body 3 that opens and closes the valve port 23 is attached. The valve body 3 is made of rubber, and the valve port 23 is closed by the urging force of the spring 31.

  An armature 33 is provided at the upper end of the valve body 3 via a valve shaft 32. The armature 33 is made of a magnetic material and is attracted to a magnet. Above the armature 33, the electromagnet 4 attached to the elevating member 40 is disposed. The electromagnet 4 is formed in a substantially U shape, and an exciting coil 41 is wound around it. The excitation coil 41 is wired so that power is supplied from the outside. When energized, the pair of magnetic poles 4a is excited to the N pole and the S pole.

  The elevating member 40 is fixed to the hollow elevating cylinder 5. The elevating cylinder 5 is prevented from rotating, and is screwed into the rotor 6 with a screw portion formed on the outer peripheral surface. The rotor 6 has a cylindrical shape, and a stepping motor is constituted by the drive coil 61 surrounding the rotor 6. Therefore, when a pulse signal is input to the drive coil 61 from a controller (not shown), the rotor 6 rotates according to the number of pulses. Since the lifting cylinder 5 screwed into the inner peripheral surface of the rotor 6 is prevented from rotating as described above, the lifting cylinder 5 moves up and down without rotating. Since the rotor 6 can be rotated forward and backward, the electromagnet 4 can be moved up and down together with the lifting cylinder 5 and can be stopped at any position within the lifting range.

  An upper lid 7 is attached to the motor safety valve 1, and a stopper 71 extending downward from the upper lid 7 is provided. When the elevating cylinder 5 is pulled up to a position where the elevating member 40 contacts the stopper 71, the elevating cylinder 5 Is not pulled any further, and when a pulse signal is further input to the drive coil 61, step-out occurs and the rotor 6 vibrates and generates abnormal noise.

  Referring to FIG. 2, when the gas stove is turned on, electromagnet 4 is positioned at the origin position. In this state, the magnetic pole 4a of the electromagnet 4 and the upper surface 33a of the armature 33 face each other with a distance of 100 pulses (PLS). That is, when 100 pulses are input to the drive coil 61 from the state where the electromagnet 4 is at the origin position and the rotor 6 is rotated forward, the magnetic pole 4 a comes into contact with the upper surface 33 a of the armature 33. Since the origin position may be shifted during use due to step-out, etc., the electromagnet 4 is lifted upward from the origin position at a predetermined cycle, and the lifting member 40 is brought into contact with the stopper 71 to intentionally step out. The position is being corrected. Since a distance of 20 pulses is set from the origin position until it comes into contact with the stopper 71, if the electromagnet 4 is lowered by 20 pulses after being stepped out, the electromagnet 4 is aligned to the correct origin position.

  In the present embodiment, 2 mA is set as the standard value of the current value passed through the exciting coil 41 of the electromagnet 4, and the frequency of the pulse signal input to the driving coil 61 is set to 200 PPS (pulses / second). Has been.

  Next, the control content of this Embodiment is demonstrated with reference to FIG. When the power is turned on (S1), the controller (not shown) is reset, and the counter N is set to the initial value 1 (S2). At this time, if necessary, the elevating member 40 is brought into contact with the stopper 71 and the origin is set. Regardless of whether the origin is set or not, the electromagnet 4 waits at the origin position until an ignition instruction is issued. ing. When there is an ignition instruction (S3), the rotor 6 is rotated forward and the electromagnet 4 is lowered. At this time, 110 pulses are input to the drive coil 61 (S4). As described above, when 100 pulses are input from the origin position, the magnetic pole 4 a of the electromagnet 4 comes into contact with the upper surface 33 a of the armature 33. Further, 10 pulses are inputted and stepped out at the fully closed position to bring the magnetic pole 4a into close contact with the upper surface 33a of the armature 33, and the rubber valve body 3 is slightly deformed during stepping out. Even if the valve body 3 is adhered to the periphery of the valve body, the adhesion can be eliminated by deforming the valve body 3.

  Next, the value of the counter N is checked. If N is 1, the igniter is turned on to generate a spark discharge for the gas burner (S5, S7). If N is other than 1 (only in this embodiment, it is greater than 1), 1 is subtracted from N (S6), and the igniter is turned on (S7).

  After the igniter is turned on, the controller determines a current value for energizing the exciting coil 41 and energizes it. If N is 1, the standard current value of 2 mA is supplied to the exciting coil 41, but if N = 2, 3 mA is supplied, and if N = 3, 4 mA is supplied (S8).

  When the energization of the exciting coil 41 is thus started, the magnetic pole 4a is magnetized and attracts the armature 33. In this state, the rotor 6 is rotated in the reverse direction, and the valve body 3 is pulled up together with the armature 33 by a distance corresponding to 20 pulses (S9). Then, the valve port 23 is opened and the gas is supplied to the gas burner through the outflow portion 22.

  Since the igniter is already turned on at that time, when the gas is ejected from the gas burner, the ejected gas is ignited. A thermocouple, which is a sensor for detecting ignition, is disposed in the vicinity of the flame hole of the gas burner. When the thermoelectromotive force from the thermocouple is input to the controller, the controller determines that the ignition has succeeded. On the contrary, if the thermoelectromotive force is not inputted even after a predetermined time has elapsed after the valve body 3 is pulled up, the controller cannot detect ignition and determines that the ignition has failed (S10).

  When ignition cannot be detected, 1 is added to the value of the counter N. However, if the value of the counter N is 3 or more at that time, the process proceeds to the next step S12 without adding 1 (S11).

  In S12, the rotor 6 is rotated forward and lowered by 20 pulses, and the magnetic pole 4a is brought into contact with the armature 33 again. Then, the current value to be supplied to the exciting coil 41 is determined again. If the value of the previous counter N is 1, the current value is determined to be 2 mA. However, since N = 2 this time, the current value is determined to be 3 mA (S8). In this way, ignition is confirmed again in a state where a larger current than the previous time is applied to the exciting coil 41 and the attractive force becomes strong (S10).

  If ignition is confirmed, the process proceeds to step S13 to turn off the igniter. If ignition is not confirmed, the above valve opening operation is repeated until the counter N becomes 3. In the state where N is 3, that is, when ignition cannot be confirmed even when the energization current value is 4 mA, although not shown, the subsequent ignition processing is stopped and a predetermined error processing routine is performed.

  If ignition can be confirmed, after the igniter is turned off as described above, 80 pulses are further supplied to the drive coil 61 to reverse the rotor 6, and the electromagnet 4 is pulled up to the origin position, that is, the fully open position. In this state, cooking is performed by variably adjusting the opening of a heating power control valve (not shown) attached downstream of the motor safety valve 1. When cooking is complete, a fire extinguishing instruction is issued (S15).

  Normally, when the fire extinguishing instruction is issued, the energization to the exciting coil 41 may be stopped. By this energization stop, the attracting force of the electromagnet 4 disappears and the valve body 3 is closed by the biasing force of the spring 31. However, in the present embodiment, the rotor 6 is further reversed by 20 pulses to raise the electromagnet to a position where the elevating member 40 contacts the stopper 71 (S16), and then the energization to the exciting coil 41 is stopped (S17). ). Thus, by stopping the energization to the exciting coil 41 after the electromagnet 4 is pulled up, the stroke of the valve body 3 until the valve is closed is maximized. While the valve body moves in the valve closing direction, the urging force of the spring 31 always acts, so that the moving speed of the valve body 3 in the valve closing direction continues to accelerate. Therefore, the longer the moving stroke of the valve body 3, the greater the impact when the valve body 3 closes the valve port 23. Since the impact is transmitted to the armature 33 via the valve shaft 32, even if dust or the like is attached to the upper surface 33a of the armature 33, there is a high possibility that the impact will be removed from the upper surface 33a.

  When extinguishing is completed in this manner, the rotor 6 is rotated forward and the electromagnet 4 is lowered by a distance of 110 pulses so that the valve body 3 can be lifted up and ignited in a short time when an ignition instruction is next issued. Then, the magnetic pole 4a of the electromagnet 4 faces the upper surface 33a of the armature 33 across a distance of 10 pulses.

  When an ignition instruction is issued again (S19), the rotor 6 is further rotated forward by 10 pulses to bring the magnetic pole 4a into contact with the upper surface 33a of the armature 33 (S20), and the process returns to step S5.

  If there is no ignition failure during the previous ignition operation, the counter N is 1. However, if ignition fails, N is 2 or more. That is, as it is, the current value to the exciting coil 41 is 3 mA or 4 mA. If the current value remains high, the battery serving as the power source is exhausted drastically. Therefore, if N = 1, N is reduced by 1, and the battery life is extended as much as possible (S5). , S6).

  By the way, when dust or the like is sandwiched between the magnetic pole 4a and the upper surface 33a of the armature 33 and is difficult to attract, the armature 33 is shocked when the valve body 3 is closed as described above, It is effective to remove the dust 33a. However, since the impact of the valve body 3 is not transmitted to the electromagnet 4, it is desirable to remove dust attached to the magnetic pole 4a.

  Therefore, in the flow of FIG. 3, a dust dropping operation is performed by pulling up the lifting member 40 to at least one of the three positions indicated by “B” and bringing it into contact with the stopper 71 to further step out.

  This dust dropping operation is performed by using 60 PPS instead of the usual 200 PPS as a pulse signal input to the drive coil 61 so that a large vibration acts on the electromagnet 4 during the step-out. However, because a large noise is generated by the step-out during this dust drop operation, an abnormal sound due to the step-out may be generated by generating another voice or signal sound, such as providing a separate voice synthesizer and generating a voice guide. It is desirable not to feel uncomfortable.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

The figure which shows the structure of one embodiment of this invention Diagram showing the vertical stroke of the electromagnet Flow chart showing control contents of motor safety valve

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor safety valve 3 Valve body 4 Electromagnet 4a Magnetic pole 5 Lifting cylinder 6 Rotor 7 Upper lid 21 Inflow part 22 Outflow part 23 Valve port 31 Spring 32 Valve shaft 33 Armature 33a Upper surface 40 Elevating member 41 Excitation coil 61 Drive coil 71 Stopper N Counter

Claims (4)

  A motor safety valve interposed in the middle of a fluid supply pipe, wherein the valve body is energized in a direction to normally close the supply pipe, and an electromagnet for adsorbing an armature provided on the valve body And a motor safety valve having a structure in which at least one of the electromagnet and the armature is vibrated to remove dust adhering to the surface. Control method.   From the state where the armature is attracted to the electromagnet and the valve element is opened, the electromagnet's adsorption force is extinguished while the valve element is moved further in the valve opening direction than the fully opened position, and the valve element is closed by the biasing force. The motor safety valve control method according to claim 1, wherein vibration is applied to the armature.   The motor mechanism is a stepping motor, and is provided with a stopper that restricts the movement of the electromagnet in the valve opening direction, and the stepping motor is stepped out in a state in which the movement of the electromagnet is regulated by the stopper to give vibration to the electromagnet. The motor safety valve control method according to claim 1 or 2.   4. The method of controlling a motor safety valve according to claim 3, wherein the frequency of the pulse signal input to the stepping motor is set to be lower than the frequency during the step-out operation.

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