JP2021092254A - Motor valve - Google Patents

Abstract

To improve workability in replacement of a motor as much as possible, in a motor valve in which a movable body mounted on an electromagnet opposed to an armature fixed to a shaft portion of a valve element is moved forward and backward in an axial direction as an opening/closing direction of the valve element by a motor through an interlock mechanism.SOLUTION: An interlock mechanism 5 is composed of a cam member 51 having an end wall portion 512 provided with an engagement hole 511 with which an output shaft 41 of a motor 4 is removably engaged in a state of preventing rotation, and a peripheral wall portion 514 inclined in an X-axis direction and provided with a cam groove 513 extended in a circumferential direction, and a pin 52 disposed on the movable body 3 and engaged with the cam groove 513.SELECTED DRAWING: Figure 2

Description

The present invention mainly relates to a motor valve provided in a gas supply path to a burner of a gas appliance.

Conventionally, as this type of motor valve, an inlet, an outlet, a valve chamber communicating with one of the inlet and the outlet, a valve seat at one end of the valve chamber, and an inlet and a flow formed in the valve seat. A valve housing having a valve hole communicating with the other side of the outlet, a valve body urged by a valve spring at a valve closing position that sits on the valve seat and closes the valve hole, and a shaft portion of the valve body slide. It has a guide cylinder that can be freely inserted, and a movable body with an electromagnet facing the armature fixed to the shaft of the valve body, a motor, and a motor that can move in the X-axis direction, which is the opening and closing direction of the valve body, by rotating the motor. Equipped with an interlocking mechanism that moves the body forward and backward, by moving the movable body forward toward the valve body in one direction in the X-axis direction, the electromagnet is brought into contact with the armature, and the movable body is moved to the X-axis with the armature attracted to the electromagnet. It is known that the valve body is opened by retracting it in the other direction (see, for example, Patent Document 1). In this mechanism, the interlocking mechanism is generally composed of a feed screw mechanism consisting of a male screw on the output shaft of the motor and a linear moving body screwed into the male screw, and connects the movable body to the linear moving body in the valve housing. ing.

By the way, when the motor breaks down and the motor is replaced, conventionally, it is necessary to take out the movable body to the outside of the valve housing and separate the movable body from the linear moving body. Here, when the movable body is taken out of the valve housing, it is necessary to carefully work so that foreign matter does not adhere to or scratch the movable body, and the workability of motor replacement deteriorates.

Japanese Unexamined Patent Publication No. 2012-62948

In view of the above points, it is an object of the present invention to provide a motor valve capable of improving the workability of motor replacement as much as possible.

In order to solve the above problems, the present invention has an inlet, an outlet, a valve chamber communicating with one of the inlet and the outlet, a valve seat at one end of the valve chamber, and a flow formed in the valve seat. A valve housing having a valve hole communicating with the other side of the inlet and the outlet, a valve body seated on the valve seat and urged by a valve spring in a closing direction to close the valve hole, and a shaft portion of the valve body. A movable body that has a guide cylinder that is slidably inserted and has an electric magnet that faces the armature fixed to the shaft of the valve, a motor, and the X-axis direction that is the opening and closing direction of the valve due to the rotation of the motor. It is equipped with an interlocking mechanism that moves the movable body forward and backward, and by moving the movable body forward toward the valve body in one direction in the X-axis direction, the electric magnet is brought into contact with the armature, and the movable body is moved in a state where the armature is attracted to the electric magnet. In the motor valve in which the valve body is opened by retracting to the other side in the X-axis direction, the interlocking mechanism is formed with an engaging hole that can be freely inserted and removed while the output shaft of the motor is stopped rotating. It is movable by being composed of a cam member having an end wall portion, a peripheral wall portion having a cam groove inclined in the X-axis direction and extending in the circumferential direction, and a pin provided on the movable body and engaging with the cam groove. It is characterized in that the body is stopped from rotating with respect to the valve housing so that the movable body moves forward and backward in the X-axis direction by the thrust in the X-axis direction acting on the pin through the cam groove due to the rotation of the cam member.

According to the present invention, even if the movable body and the cam member constituting the interlocking mechanism are housed in the valve housing, the interlocking is performed only by pulling out the output shaft of the motor from the engaging hole formed in the end wall portion of the cam member. The motor can be separated from the mechanism. Therefore, when the motor is replaced, it is not necessary to take out the movable body and the interlocking mechanism to the outside of the valve housing, and the workability of the motor replacement is improved as much as possible.

Further, in the present invention, the movable body is provided with a core of an electromagnet retreating from a fixed position to the other end in the X-axis direction, and a spacer member abutting on the other end in the X-axis direction of the core. It is desirable to insert a cushion spring that urges and holds the core in a fixed position with respect to the movable body between the end wall portion of the cam member. According to this, when the movable body is advanced in one direction in the X-axis direction and the core is brought into contact with the armature while the valve body is in the valve closed position, the core resists the urging force of the cushion spring and is on the X-axis. It can recede in the other direction and mitigate the collision shock of the core against the armature. Further, since the movable body is urged in one direction in the X-axis direction via the core by the urging force of the cushion spring, the load of the motor when advancing the movable body in one direction in the X-axis direction can be reduced by the urging force of the cushion spring. , The motor can be miniaturized. Further, since the spacer member is interposed between the cushion spring and the core, the core does not tilt due to prying with the cushion spring, and the armature can be stably attracted.

Further, in the present invention, the movable body combines two members, a first member provided with a bobbin around which the coil of the electromagnet is wound, and a second member having a guide cylinder portion and being prevented from rotating with respect to the valve housing. It is desirable to be configured. According to this, in a state where the first member is separated from the second member, the coil is wound around the bobbin without being disturbed by the second member, and then the first member and the second member are combined to form a movable body. Can be assembled, improving assembleability.

The cut side view of the motor valve of embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. The perspective view of the disassembled state of the main part of the motor valve of an embodiment. The enlarged side view of the cam member provided in the motor valve of an embodiment.

With reference to FIGS. 1 and 2, reference numeral 1 denotes a valve housing of a motor valve according to an embodiment of the present invention. The valve housing 1 has an inflow port 11, an outflow port 12, a valve chamber 13 communicating with the inflow port 11, and a valve seat 14 at one end of the valve chamber 13, and the valve seat 14 has a flow. A valve hole 141 communicating with the outlet 12 is formed. The motor valve of the present embodiment is interposed in the gas supply path to the burner of the gas appliance, and the gas flowing out from the outflow port 12 is supplied to the burner.

A valve body 2 and a movable body 3 are housed in the valve chamber 13. The valve body 2 is urged to a valve closing position in which the valve body 2 is seated on the valve seat 14 and closes the valve hole 141 by a valve spring 21 contracted between the valve body 2 and the movable body 3. Further, the opening / closing direction of the valve body 2 is the X-axis direction, the closing direction is the X-axis direction, and the opening direction is the X-axis direction, and the valve body 2 is seated on the valve seat 14 at one end in the X-axis direction. And a shaft portion 23 extending from the valve portion 22 to the other end in the X-axis direction, and the armature 24 is fixed to the other end of the shaft portion 23 in the X-axis direction. The motor valve of the present embodiment is arranged in a posture in which the X-axis direction is horizontal.

The movable body 3 has a guide cylinder portion 31 into which the shaft portion 23 of the valve body 2 is slidably inserted. Further, an electromagnet 32 facing the armature 24 is attached to the movable body 3. The electromagnet 32 is composed of a U-shaped core 321 and a coil 323 wound around an arm portion on one side of the core 321 via a bobbin 322, and is excited by energization of the coil 323. The coil 323 is connected to the terminal portion 151 provided on the side portion of the lid member 15 fastened to the valve housing 1 so as to close the other end of the valve chamber 13 via the feeding plate 324.

In addition, referring to FIG. 3, the movable body 3 is composed of two members, a bottomed tubular first member 3a provided with a bobbin 322 and a stepped tubular second member 3b having a guide tubular portion 31. Is combined to form. This coupling is performed by engaging the annular convex portion 33 on the inner circumference of the other end of the second member 3b in the X-axis direction with the annular groove 34 on the outer periphery of the intermediate portion of the first member 3a. Further, the bobbin 322 is integrally molded on one end wall portion of the first member 3a in the X-axis direction so as to project in the one in the X-axis direction. When the movable body 3 is composed of two members in this way, the coil 323 is wound around the bobbin 322 without being disturbed by the second member 3b in a state where the first member 3a is separated from the second member 3b. The movable body 3 can be assembled by connecting the first member 3a and the second member 3b, and the assembling property is improved.

Further, the valve housing 1 includes a small diameter portion 161 on one side in the X-axis direction, a large diameter portion 162 on the other side in the X-axis direction, and a step portion 163 in the middle, which are inserted in the half portion near the other end of the valve chamber 13. A stepped tubular inner case 16 is provided. Then, each rib 35 extending in the X-axis direction protruding from the outer periphery of the intermediate portion of the second member 3b is placed between each pair of ribs 164 extending in the X-axis direction protruding from the inner peripheral surface of the small diameter portion 161 of the inner case 16. By engaging, the second member 3b, that is, the movable body 3, is prevented from rotating with respect to the inner case 16, that is, the valve housing 1.

A motor 4 made of a stepping motor is attached to the outer surface of the lid member 15. Further, in the valve housing 1, an interlocking mechanism 5 for moving the movable body 3 forward and backward in the X-axis direction by the rotation of the motor 4 is provided. Then, by advancing the movable body 3 toward the valve body 2 existing in the valve closed position in one direction in the X-axis direction, the electromagnet 32 is brought into contact with the armature 24, and the armature 24 is attracted to the electromagnet 32 by energizing the coil 323. By retracting the movable body 3 to the other side in the X-axis direction in the state of being moved, the valve body 2 is opened and the motor valve is opened. Further, when a stop command is issued due to a fire extinguishing operation by the point fire extinguishing switch or a misfire of the burner, the energization of the coil 323 is stopped, and the valve body 2 is returned to the valve closing position by the urging force of the valve spring 21. Stop the gas supply to the burner.

The interlocking mechanism 5 includes an end wall portion 512 formed with an engaging hole 511 that can be freely inserted and removed while the output shaft 41 of the motor 4 is stopped rotating, and a cam groove that is inclined in the X-axis direction and extends in the circumferential direction. It is composed of a cam member 51 having a peripheral wall portion 514 on which 513 is formed, and a pin 52 provided in the movable body 3 and engaging with the cam groove 513. When the motor 4 is rotated, the cam member 51 rotates, and this rotation causes a thrust in the X-axis direction to act on the pin 52 via the cam groove 513, and this thrust causes the movable body 3 to move forward and backward in the X-axis direction. The cam member 51 is sandwiched between the step portion 163 of the inner case 16 and the lid member 15 in the large diameter portion 162 of the inner case 16 and is arranged so as to rotate without moving in the X-axis direction. ..

A pin hole 36 is formed in the peripheral wall portion of the first member 3a of the movable body 3, and an arm portion 37 extending in the other direction in the X-axis direction along the peripheral wall portion of the first member 3a is further formed in the second member 3b. A pin hole 38 is formed in the arm portion 37 so as to extend and overlap the pin hole 36 of the first member 3a. Then, the pin 52 is connected to the movable body 3 by inserting the pin 52 into the pin holes 36 and 38.

According to the above configuration, even if the cam member 51 constituting the movable body 3 and the interlocking mechanism 5 is housed in the valve housing 1, the motor 4 is formed from the engagement hole 511 formed in the end wall portion 512 of the cam member 51. The motor 4 can be separated from the interlocking mechanism 5 simply by pulling out the output shaft 41 of the above. Therefore, when the motor 4 is replaced, it is not necessary to take out the movable body 3 and the interlocking mechanism 5 to the outside of the valve housing 1, and the workability of the motor replacement is improved as much as possible.

Further, in the present embodiment, the cam groove 513 is provided so that the motor 4, that is, the movable body 3 can be moved from one stroke end in the X-axis direction to the other stroke end in the X-axis direction by approximately 1/4 rotation of the cam member 51. Is forming. Further, as clearly shown in FIG. 4, one end of the cam groove 513 in the X-axis direction and the other end are formed in flat portions 513a and 513b that do not incline in the X-axis direction. Therefore, as long as the pin 52 is engaged with the flat portions 513a and 513b, the movable body 3 is located at each stroke end of one and the other in the X-axis direction even if the rotation stop position of the motor 4 is slightly deviated. It becomes easy to control.

By the way, when the core 321 of the electromagnet 32 is fixed to the movable body 3, the movable body 3 is advanced in one direction in the X-axis direction while the valve body 2 is in the valve closed position, and the core 321 is brought into contact with the armature 24. At the time of making the armature 24, a collision shock of the core 321 with respect to the armature 24 occurs. Therefore, in the present embodiment, the core 321 is placed in a fixed position on the movable body 3, specifically the first member 3a, that is, the base end portion of the core 321 is located on one end wall portion of the first member 3a in the X-axis direction. It is provided so that it can be retracted from the abutting position to the other in the X-axis direction. Further, a bifurcated spacer member 325 straddling the pin 52 that abuts on the other end of the core 321 in the X-axis direction is provided, and a movable body is provided between the spacer member 325 and the end wall portion 512 of the cam member 51. A cushion spring 326 that urges and holds the core 321 in a fixed position is provided with respect to 3.

According to this, when the movable body 3 is advanced in one direction in the X-axis direction and the core 321 is brought into contact with the armature 24, the core 321 retracts in the other direction in the X-axis direction against the urging force of the cushion spring 326. The collision shock of the core 321 with respect to the armature 24 can be mitigated. Further, the movable body 3 is urged in one direction in the X-axis direction via the core 321 by the urging force of the cushion spring 326. Therefore, the load of the motor 4 when the movable body 3 is advanced in one direction in the X-axis direction can be reduced by the urging force of the cushion spring 326, and the motor 4 can be miniaturized. Further, since the spacer member 325 is interposed between the cushion spring 326 and the core 321, the core 321 does not tilt due to prying with the cushion spring 326, and the armature 24 can be stably attracted.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, a pin 52 separate from the movable body 3 is connected to the movable body 3, but a protrusion that engages with, for example, the first member 3a of the movable body 3 and the cam groove 513 of the cam member 51. The portion may be integrally molded, and the pin 52 may be formed by the protrusion. Further, the valve housing 1 itself can be provided with the same function as the inner case 16, and the inner case 16 can be omitted. Further, in the above embodiment, the port communicating with the valve chamber 13 is the inflow port 11 and the port communicating with the valve hole 141 is the outlet 12, but the port communicating with the valve chamber 13 is the outlet and communicating with the valve hole 141. The port may be used as an inflow port. Further, in the above embodiment, the motor valve is arranged in a posture in which the X-axis direction is horizontal, but the motor valve may be arranged in a posture in which the X-axis direction is vertical.

1 ... valve housing, 11 ... inlet, 12 ... outlet, 13 ... valve chamber, 14 ... valve seat, 141 ... valve hole, 2 ... valve body, 21 ... valve spring, 23 ... shaft, 24 ... armature, 3 ... Movable body, 3a ... 1st member, 3b ... 2nd member, 31 ... Guide cylinder, 32 ... Electromagnet, 321 ... Core, 322 ... Bobbin, 323 ... Coil, 325 ... Spacer member, 326 ... Cushion spring, 4 ... Motor, 41 ... output shaft, 5 ... interlocking mechanism, 51 ... cam member, 511 ... engagement hole, 512 ... end wall part, 513 ... cam groove, 514 ... peripheral wall part, 52 ... pin.

Claims (3)

A valve chamber that communicates with the inlet, an outlet, one of the inlet and the outlet, a valve seat at one end of the valve chamber, and a valve hole formed in the valve seat that communicates with the other of the inlet and the outlet. A valve housing having the above, a valve body urged by a valve spring at a valve closing position that sits on the valve seat and closes the valve hole, and a guide cylinder portion in which the shaft portion of the valve body is slidably inserted. It also has a movable body with an electromagnet facing the armature fixed to the shaft of the valve body, a motor, and an interlocking mechanism that moves the movable body forward and backward in the X-axis direction, which is the opening and closing direction of the valve body, by rotating the motor. By moving the movable body forward toward the valve body in one direction in the X-axis direction, the electric magnet is brought into contact with the armature, and the movable body is retracted in the other direction in the X-axis direction while the armature is attracted to the electric magnet. In the motor valve that opens the body
The interlocking mechanism consists of an end wall portion with an engaging hole formed so that the output shaft of the motor can be freely inserted and removed while the output shaft is stopped rotating, and a peripheral wall with a cam groove inclined in the X-axis direction and extending in the circumferential direction. It is composed of a cam member having a portion and a pin provided on the movable body that engages with the cam groove. The movable body is prevented from rotating with respect to the valve housing, and the rotation of the cam member causes the pin to be formed through the cam groove. A motor valve characterized in that a movable body moves forward and backward in the X-axis direction by an acting thrust in the X-axis direction. The movable body is provided with a core of the electromagnet retreating from a fixed position to the other end in the X-axis direction, and a spacer member abutting on the other end in the X-axis direction of the core. The spacer member and the cam member are provided. The motor valve according to claim 1, wherein a cushion spring for urging and holding the core in a fixed position with respect to the movable body is interposed between the end wall portion of the motor valve. The movable body combines two members, a first member provided with a bobbin around which the coil of the electromagnet is wound, and a second member having the guide cylinder portion and which is prevented from rotating with respect to the valve housing. The motor valve according to claim 1 or 2, wherein the motor valve is configured.

Images