JP2013057394A - Valve actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact valve actuator that can be installed in a small space, with the necessary minimum number of parts, and ensures high visibility to easily check a valve opening degree without observing it from the outside.SOLUTION: A deceleration gear group 22 is installed in a lower surface region R of a motor 21 provided in a case body 20. A protruding cam 25 that rotates along with the rotation of the last-stage gear is fixed to the last-stage gear of the deceleration gear group 22. The protruding cam 25 is extended from the bottom surface 36 of the motor 21 and protruded slightly more than the outer periphery of the last-stage gear. A limit switch 24 disposed in the case body 20 is arranged in a space region T on the side surface of the motor 21. The limit switch 24 is moved on/off by rotating the protruding cam 25.

Description

  The present invention relates to a valve actuator, and more particularly, to a small actuator that has a valve opening display function and is compactly mounted as a whole for installation in a device.

Conventionally, as an actuator for mounting a valve having a valve opening display function, for example, a plate shape that operates in conjunction with an output shaft between an output shaft for output transmission and a valve connected to the output shaft. Also known are those having a pin-like valve opening indication section. In this case, the valve opening is confirmed by visually recognizing the opening display portion from the lateral direction of the actuator or slightly upward. In addition, a valve opening degree display unit may be provided on the upper side through an intermediate drive shaft connected to the output shaft. In this case, the valve opening state is confirmed by visually recognizing the valve opening display section from above.
On the other hand, an electric valve using an actuator disclosed in Patent Document 1 is known. The actuator in the literature 1 is mounted on a rotary valve such as a ball valve, and the rotation from the motor is decelerated by a reduction mechanism and transmitted to the valve. The speed reduction mechanism is provided between the motor and the stem. In order to provide the speed reduction mechanism, it is necessary to largely shift the motor and the stem in the lateral direction.

  By the way, for example, in piping lines inside various devices, a rotary valve with this type of actuator is often provided in order to achieve centralized control of fluids and systemization of the device. In order to dispose in a limited installation space, a reduction in size is required. When the actuator is made compact, it is important to make the valve opening display portion compact while ensuring its visibility.

Japanese Patent No. 4575016

  However, in the case of an actuator in which the valve opening degree display unit is provided between the valves, a space for providing the valve opening degree display unit is required between them, so that it is difficult to make the whole compact. In addition, the valve opening display section of the actuator has poor visibility from a distance, and the operator may need to move to the vicinity of the actuator in order to check the valve opening display section. When this actuator is arranged in a narrow installation space in the device, the valve opening degree may be confirmed while looking into the valve opening degree display unit from the outside because the actuator itself or the valve gets in the way.

In the case of an actuator provided with an indicator at the top of the drive shaft, it is difficult to achieve compactness by extending the drive shaft upward. In addition, a spur gear train is often provided inside this type of actuator, and in this case, various components are arranged above the output shaft, so a valve opening indicator is provided above the output shaft. It becomes difficult to provide. For this reason, for an actuator having a gear train with a predetermined reduction ratio, it is conceivable to provide an opening indicator on the top of the actuator while bypassing the output shaft and parts on the top of the output shaft. As a result, the transmission efficiency is lowered, and the internal structure becomes complicated due to the increase in the number of parts, so that it is impossible to avoid an increase in size of the entire actuator.
Moreover, in any of the actuators, as in Patent Document 1, the speed reduction mechanism is provided between the motor and the stem, and the motor and the stem are largely shifted in the lateral direction in order to provide this speed reduction mechanism. Because it is necessary, the actuator has a shape extending in the lateral direction, and the whole size has been increased.

  The present invention has been developed in view of the conventional problems, and the object of the present invention is to make it as compact as possible with the minimum necessary number of parts, for example, to be compactly incorporated into equipment, etc. To provide a valve actuator that can be installed in a small installation place while saving space, ensuring excellent visibility and easily checking the valve opening without looking into from the outside. is there.

  In order to achieve the above object, according to the first aspect of the present invention, a reduction gear group is provided in the lower surface region of the motor provided in the case body, and the final gear of the reduction gear group is accompanied by the rotation of the final gear. The projecting cam part that rotates is fixed, and the projecting cam part extends from the bottom surface of the motor and slightly projects from the outer periphery of the final gear, and the limit switch provided in the case body is attached to the side of the motor. This is an actuator for a valve that is arranged in a space region and that allows a limit switch to be contacted and separated by a rotating operation of a protruding cam portion.

  The invention according to claim 2 forms an indicator part in which the tip part of the protruding cam part protrudes upward along the side surface of the motor, and provides a transparent or translucent visual recognition part on the cover body fixed to the case body. This is an indicator of the valve that allows the operation state of the indicator to be visually recognized from the outside of the cover body through the visual recognition unit.

  According to a third aspect of the present invention, a ground plate for fixing the motor is fixed to the case body, and a bearing portion for bearing the upper end of the rotation shaft of each gear of the reduction gear group provided in the lower surface region of the motor is provided on the lower surface of the ground plate. This is a valve actuator in which the lower end of the rotating shaft is supported by a bearing provided on the bottom surface of the case body.

  According to a fourth aspect of the present invention, the rear end portion of the protruding cam portion is fixed to the shaft portion of the final gear, and the protruding portions that fix both sides of the protruding cam portion are fixed to the final gear, and the protruding portion is engaged. This is a valve actuator in which a stopper portion to be mated is provided on the lower surface of the main plate, and a protruding cam portion is provided so as to be able to rotate about 90 °.

  In the invention according to claim 5, the press-fitting fitting portion provided at the rear end portion of the protruding cam portion is fixed to the shaft portion of the final gear, and both sides of the press-fitting fitting portion are sandwiched between the pair of protrusions. This is a valve actuator in which the protruding cam piece provided in the press-fitting fitting portion is fixed to the final gear.

  The invention according to claim 6 is the valve actuator in which the protrusion is a pair of stopper pins.

  According to a seventh aspect of the present invention, a wiring retainer having a through hole penetrating an output stage shaft provided at a lower part of the final stage gear and a rotation shaft of each gear of the reduction gear group is fixed in the case body. It is the actuator of the valve | bulb which accommodated the wiring arrange | positioned in the bottom face of the wire with the wiring retainer.

  The invention according to claim 8 is the valve actuator in which the cover body is joined to the case body by ultrasonic welding.

  According to the first aspect of the present invention, the limit switch disposed in the space region in the case body is brought into contact with and separated from the space by the turning operation of the protruding cam portion fixed to the final gear of the reduction gear group. It can be made as compact as possible with a small number of parts with limited parts, for example, it can be compactly incorporated into equipment, etc., while being compact, it can save space and be installed in narrow installation places By visually recognizing the protruding cam portion, excellent visibility can be secured and the valve opening can be easily confirmed without looking into from the outside.

  According to the second aspect of the present invention, the compactness can be maintained by providing the indicator portion in the space-saving by utilizing the space above the final gear on the side surface of the motor, and the cover body can be made transparent or translucent. The valve opening can be easily confirmed from the upward direction and the lateral direction by visually recognizing the indicator part via the visual recognition part, and the visibility from a distance is increased. Moreover, even when arranged in a narrow installation space, it is easy to grasp the valve opening state by checking the indicator portion protruding upward from the outside.

  According to the third aspect of the present invention, the rotating shafts of the gears of the reduction gear group are supported by the base plate and the case main body for fixing the motor, so that each gear can be mounted while being accurately positioned at a predetermined position. By attaching the gears with high precision, the vibration during operation can be reduced by suppressing the vibration of each gear while improving the strength during shaft mounting.

  According to the fourth aspect of the present invention, the protrusions and the stoppers are engaged with each other so that the protruding cam part can be rotated by about 90 °, so that the contact of the limit switch due to excessive rotation of the protruding cam part. It becomes possible to control the valve opening degree of the valve with high accuracy while preventing defects and failures.

  According to the invention of claim 5, even if the press-fitting fitting portion of the protruding cam portion is loosened or broken, the limit switch is operated reliably by maintaining the position of the protruding cam piece with respect to the final gear by the protruding portion. it can. Thereby, a fail-safe function that does not hinder the function of the product is exhibited. Since the protrusion function is used to exhibit the stop function of the protruding cam portion, even if the limit switch is damaged, the valve can be kept within the specified rotational operation range. Since the protrusion is provided on the final gear which is a necessary position in the product structure, a fail-safe function can be added while maintaining the compactness of the product.

  According to the invention which concerns on Claim 6, a projection part can be provided as a pair of stopper pin, and a projection part can be easily formed by attaching this stopper pin to the last stage gear by fixing means, such as press fitting.

  According to the seventh aspect of the present invention, the wiring can be stored in a compact storage space in the case body while ensuring the smooth rotation operation of the reduction gear group by the wiring presser, and this wiring contacts or winds around the reduction gear group. It also prevents it.

  According to the eighth aspect of the present invention, the cover body is ultrasonically welded to the case body, so that it is not necessary to provide a sealing member such as an O-ring or a mounting step for joining between the case body and the cover body. Therefore, it is possible to prevent dust and other water from entering the actuator while minimizing the overall height and exhibiting excellent compactness.

It is a separation perspective view of the actuator of the valve of the present invention. It is the isolation | separation perspective view which showed the connection state to the valve | bulb of an actuator. It is a perspective view which shows the actuator of the valve | bulb of this invention. It is a bottom view of a case. It is a top view of a case. It is a front view which shows the connection state of an actuator and a valve | bulb. It is the perspective view which showed the temporary attachment state to the valve | bulb of the connection plate body. (A) is a partially cutaway sectional view showing a state in which the valve and the actuator are connected. (B) is a partially cutaway sectional view showing a state in which the actuator is removed from the valve. It is AA sectional drawing of Fig.8 (a). It is a separation perspective view of the actuator of the valve of the present invention. It is a partially cutaway perspective view of an actuator. It is a top view which shows the actuator of the state which removed the cover. It is a side view which shows the attachment state of the last stage gear. It is the model top view which showed the reduction gear group. It is a perspective view which shows the attachment state of the last stage gear. (A) is a top view which shows the state of the protrusion cam part at the time of opening and closing of a valve. (B) is a top view which shows the state of the protrusion cam part at the time of valve opening. (C) is a top view which shows the state of the protrusion cam part at the time of valve closing. It is the schematic plan view which showed the mounting state of the protrusion cam part. It is a schematic perspective view of FIG. It is the side view which showed the other example of the actuator of the valve | bulb of this invention. It is the partially notched side view which showed the other example of the actuator of the valve | bulb of this invention. It is a partially expanded sectional view which showed the communicating hole part vicinity of the case main body of FIG. It is a top view which shows the state which removed the cover body of the case main body of FIG. It is a longitudinal cross-sectional view of FIG.

  Embodiments of a valve actuator according to the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an exploded perspective view of the actuator of the valve of the present invention, FIGS. 3 and 6 show a connection state between the valve and the actuator, and FIG. 10 shows an exploded perspective view of the actuator.

  In the figure, the valve actuator in the present invention has a valve 1, an actuator body 2, and a connection plate body 3, and the valve 1 and the actuator body 2 are detachable via the connection plate body 3. A rotary valve equipped with the actuator of the present invention is disposed as an automatic operation valve, for example, inside various devices (not shown) or a part of a plant.

  As shown in FIG. 2, the valve 1 has a rotary valve structure including, for example, a ball valve shown in the figure, and a valve body 5 having a port 5 a is built in the body 4 of the valve 1. A stem 7 is connected to the body 4 via a stem shaft mounting portion 6 formed on the body 4. The valve 1 can rotate the valve body 5 through the stem 7, and the stem 7 can be rotated by the actuator body 2 connected to the body 4. A flow path 4 a is provided in the body 4, and the flow path 4 a is opened and closed by the rotation of the valve body 5.

  An outer peripheral top surface portion 8 is formed around the stem shaft mounting portion 6 of the body 4, and a pair for fixing the connection plate body 3 to both side surface positions of the body 4 that is equal to or less than the outer peripheral top surface portion 8. The mounting portions 9 and 9 are formed so as to protrude alternately in the lateral direction, and through holes 11 into which the bolts 10 can be inserted are formed in the mounting portions 9. A parallel two-surface portion 12 is formed at the upper end of the stem 7, and the parallel two-surface portion 12 is formed so as to protrude slightly from the upper surface of the stem shaft mounting portion 6.

The outer peripheral top surface portion 8 here refers to the top position of the body 4 on the stem shaft mounting portion 6 side. If the body 4 has a hexagonal cross section as in this example, the top portion of the body 4 and the stem shaft mounting portion 6 side. If the flat surface as shown in FIG. 2 is formed on the top, the top surface of the flat surface is referred to. If the body 4 is circular in cross section, the circular top on the stem shaft mounting portion 6 side of the body 4 is defined. Say.
In addition, in FIG. 6, if the body is in the area of the gap S provided between the outer peripheral top surface 8 and the tapered surface of the body 4 or a body having a circular cross section (not shown), it is between the top and the rounded surface. A connecting mechanism 90 shown in FIG. 8 and a reinforcing rib 80c shown in FIG. 7 are accommodated in the space S. Therefore, since a rotary valve with an actuator can be configured by placing the bottom surface portion 20a of the case body 20 of the actuator 2 shown in FIG. 4 on the flange portion 80 of the connection plate body 3, the integrated actuator and rotary valve It becomes possible to make the height as small as possible, which can significantly contribute to the downsizing of the product.

  In the present embodiment, the attachment portion 9 is equal to or less than or equal to or less than the outer peripheral top surface portion 8 of the body and is disposed above the flow axis of the body 4. The bolt 10 is inserted into the through hole 11 of the attachment portion 9 only from the lower side, and is screwed into a male screw 80b of the connection plate body 3 described later. Thereby, the distance between the actuator 2 and the valve 1 is reduced, and the connection between the actuator 2 and the valve 1 is made possible while keeping the overall height low.

  1 and 10, the actuator body 2 of the valve of the present invention is an electric type, and an electric motor 21 and the rotation from the motor 21 are transmitted to the case body 20 of the actuator body 2 at a reduced speed. A reduction gear group 22, an output shaft 23, a limit switch 24, a protruding cam portion 25, an indicator portion 26, and a control portion 27 such as a capacitor are provided. Each of these components is housed in a predetermined position in the case main body 20 via the base plate 30 and the wiring retainer 31, and a covering cover body 32 is fixed to the case main body 20.

  As shown in FIG. 5, the case main body 20 has a semicircular arc-shaped portion 20a and a rectangular portion 20b, which are connected to each other. A bearing portion 33, an internal thread 34, and a placement surface 35 are formed in the case body 20. The bearing portion 33 is provided on the bottom surface 36 of the case main body 20, and each of the first gear 41, the second gear 42, the third gear 43, the fourth gear 44, and the final gear 45 of the reduction gear group 22 is provided by the bearing portion 33. The lower end 47 of the rotation shaft 46 of the gear can be bearing. The female screw 34 is provided on the inner peripheral side of the case main body 20, and the placement surface 35 is provided at a position higher than the bottom surface 36 of the case main body 20, and the wiring presser can be placed on the placement surface 35. ing. A communication hole 48 is provided on the bottom side surface of the case body 20, and a bush 49 is attached to the communication hole 48.

A flange 50 is provided on the outer periphery of the bottom of the motor 21, and the motor 21 is attached to the upper surface 30 a of the main plate 30 through a notch 51 provided in the flange 50. The motor 21 is screwed and fixed to the female screw 34 of the case body 20 with the male screw 52 through the fixing base plate 30.
The base plate 30 is provided with a through hole 54 through which the male screw 52 can be inserted, and the motor 21 is positioned and fixed to the case body 20 together with the base plate 30 through the notch 51 and the through hole 54. A bearing portion 55 is provided on the lower surface 30 b of the main plate 30, and the rotation shaft 46 of each gear 40, 41, 42, 43, 44, 45 of the reduction gear group 22 provided in the lower surface region R of the motor 21 by this bearing portion 55. The upper end 56 of this is bearing. Furthermore, as shown in FIGS. 14 to 16, a stopper portion 58 for engaging with a stopper pin 57 described later is provided on the lower surface 30 b of the main plate 30. An arc portion 59 bulges out on the indicator portion 26 side of the main plate 30 in accordance with the arc shape of the final gear 45 of the reduction gear group 22. As a result, the final gear 45 is protected by the arc portion 59.

  In FIG. 14, a pinion 40 is attached to the rotary shaft 60 on the output side of the motor 21, and the reduction gear group 22 includes the pinion 40, the first gear 41, the second gear 42, the third gear 43, and the fourth gear. 44 and a final gear 45, and a pin is inserted as a rotation shaft 46 at the center of each gear 41, 42, 43, 44. As shown in FIG. 12, the reduction gear group 22 is provided in the lower surface region R of the motor 21 of the case main body 20, and is housed in the case main body 20 in a state of being parallel to the motor 21 in the vertical direction.

  FIG. 19 shows another example of the valve actuator. The actuator of this valve has a motor 21, a base plate 30, an output shaft 23, and an indicator portion 26, and a reduction gear group (not shown) is provided inside the motor 21, so that the motor 21 is provided in the form of a geared motor. is there.

  The base plate 30 is fixed to the lower surface side of the motor 21, and a bearing portion (not shown) for bearing the lower end of the rotation shaft of each gear of the reduction gear group in the motor 21 is formed on the upper surface side of the base plate 30. On the other hand, the upper end of each gear is pivotally supported by a bearing portion (not shown) provided in the case body 20.

  The output shaft 23 is coaxially attached to a shaft portion of a final gear (not shown) in the motor 21, and a protruding cam portion 25 is fixed to the output shaft 23. The protruding cam portion 25 is slightly protruded from the outer periphery of the final stage gear inside the case main body 20, and a limit switch (not shown) provided in the case main body 20 can be contacted and separated by rotating the protruding cam portion 25. ing.

  The indicator portion 26 is fixed coaxially to the shaft portion (output shaft 23) of the final gear, and rotates as the output shaft 23 rotates. The indicator portion 26 is provided so as to be the same as the operation of the protruding cam portion 25, whereby the indicator portion 26 provided directly on the output side of the output shaft 23 is visually recognized outside the unitized motor 21. The operation of can be confirmed. Further, as shown in the figure, the indicator portion 26 may be attached so that the visual recognition portion 26a is erected, and in this case, it becomes easier to confirm the state of the actuator.

  As in this example, the reduction gear group may be provided inside the motor 21, and in this case as well, when the reduction gear group is provided in the lower surface region of the motor, the rotation operation of the protruding cam portion 25 is performed. The limit switch can be connected and separated. In this actuator, the base plate 30 is fixed to the lower surface side of the motor 21 and the indicator portion 26 is provided outside the case main body 20 to further improve the compactness. As a result, it can be installed in a narrow installation place while saving space. Since the indicator part 26 is exposed to the outside of the case body 20, the state of the indicator part 26 can be easily confirmed, and the state of the actuator can be easily confirmed even from a distance.

  14, the pinion 40 is the first gear 41, the first gear 41 is the second gear 42, the second gear 42 is the third gear 43, the third gear 43 is the fourth gear 44, and the fourth gear. 44 is meshed with the final gear 45. The rotation of the rotating shaft portion 60 of the motor 21 is decelerated by the reduction gear group 22 and transmitted to the stem 7 of the valve 1 from the output shaft 23 that is coaxially attached to the final gear 45.

  As shown in FIGS. 14 to 17, the protruding cam portion 25 is attached in a state where the rear end portion 25 a is fixed to the output shaft 23 that is coaxially attached to the shaft portion 45 a of the final gear 45. It rotates with the rotation of 23. The protruding cam portion 25 extends from the bottom surface 36 of the motor 21 and slightly protrudes from the outer periphery of the final gear 45, and the limit switch 24 is brought into and out of contact with the rotating operation of the protruding cam portion 25. It is possible. In the protruding cam portion 25, a cylindrical press-fit fitting portion 28 for press-fitting and fixing the columnar output shaft 23 is provided at the rear end portion 25 a, and a protruding cam piece 29 is formed from the press-fit fitting portion 28. ing. The protruding cam piece 29 is provided in such a length that it can contact and separate from the limit switch 29, and a wide base 38 is formed on the side of the protruding cam piece 29 on the press-fitting portion 28. The base portion 38 increases the strength of the press-fitting fitting portion 28 of the protruding cam piece 29 and can withstand torque transmitted from the output shaft 23. The indicator portion 26 is fixed to the distal end side of the protruding cam piece 29.

  A pair of fixing projections 57, 57 are fixed to both sides of the protruding cam portion 25 of the final gear 45, and the projection 57 engages with the stopper portion 58 provided on the base plate 30. Thus, the protruding cam portion 25 can be rotated by a predetermined angle, for example, approximately 90 °. In the present embodiment, the pair of protrusions 57 are formed of stopper pins, and the stopper pins 57 are attached to the final gear 45 in the same direction as the output shaft 23 by appropriate fixing means such as press fitting. Accordingly, the stopper pin 57 can be easily provided on the final stage gear 45.

  In this case, as shown in FIG. 16A, with reference to the position of the intermediate opening of the final gear 45, the final gear 45 rotates at an angle α of 45 ° in the fully closed direction and 45 ° in the fully opened direction. A stopper pin 57 is arranged at a position where it becomes possible. Further, as shown in FIGS. 16 (b) and 16 (c), a play angle β for rotating the final gear 45 more than 45 ° may be provided on the fully opened and fully closed positions side, respectively. . The play angle β at this time may be about 4 °. By providing this play angle β, the final stage gear 45 rotates to 45 ° or more in the fully open and fully closed directions, and is limited by the protruding cam portion 25. The switch 24 can be reliably turned on.

  Here, when the power of the motor 21 is stopped as described above, the protruding cam portion 25 is operated by operating the limit switch 24. However, if this is repeated excessively, the protruding cam portion 25 may break. With this, the output shaft 23 idles with respect to the protruding cam portion 25, and the protruding cam portion 25 cannot transmit the operation of the output shaft 23 to the limit switch 24, or the power to the motor 21 can be cut off. Disappear. In these cases, the operation of the motor 21 cannot be stopped, and the valve 1 may continue to rotate and repeatedly open and close.

  In particular, when the protruding cam portion 25 is press-fitted when arranged on the output shaft 23, there is a high possibility that stress concentrates on the press-fitted portion of the protruding cam portion 25 to cause looseness or breakage. Since the protruding cam portion 25 is often manufactured by resin molding, even if strength of the press-fit portion is given sufficient strength by strength calculation, analysis, etc., it is predicted that strength and durability will be reduced due to external factors. difficult.

  Therefore, as shown in FIGS. 17 and 18, the press-fitting fitting portion 28 of the protruding cam portion 25 is fixed to the shaft portion 45 a (output shaft 23) of the final gear 45, and a pair of protrusion portions 57 and 57 are used. The protruding cam piece 29 provided on the press-fitting fitting portion 28 was fixed to the final gear 45 by sandwiching both sides of the press-fitting fitting portion 28.

  As a result, even if the output shaft 23 tries to idle with respect to the protruding cam portion 25 by repeating the rotation operation of the output shaft 23, the stopper pins 57 on both sides of the protruding cam portion 25 support the protruding cam portion 25. . In this case, two-point support is achieved by fixing the press-fitting fitting portion 28 and the output shaft 23 and abutting the stopper pin 57 on the side pressing the protruding cam piece 29 in the rotation direction and the protruding cam piece 29 (base 38). Thus, the protruding cam portion 25 rotates together with the output shaft 23 (final gear 45). As a result, the protruding cam portion 25 reliably rotates accurately with the rotation of the output shaft 23 (the shaft portion 45a of the final gear 45), and the function of turning on the limit switch 24 by this protruding cam portion 25 is maintained. Thus, idling of the valve 1 can be reliably prevented. In this case, the protrusion 57 may be other than the stopper pin, and can be provided in various forms as long as the protruding cam piece 29 can be fixed to the final gear while sandwiching both sides of the press-fitting fitting portion 28.

  As described above, the protruding cam portion 25 is disposed on the output shaft 23 so as to be able to rotate at a specified angle (90 °). For this reason, the stopper pin 57 needs to be disposed at a specified position. Even if the limit switch 24 is damaged and the power of the motor 21 cannot be stopped, the stopper pin 57 is used to prevent the valve 1 from idling and the engagement with the stopper portion 58 in FIG. A stopper function is provided to stop at a specified position. For this reason, it is possible to maintain the rotation operation at the specified angle of the valve.

  For example, in FIG. 17, when the prescribed angle γ when the protruding cam portion 25 rotates is 90 °, when the protruding cam portion 25 breaks, the protruding cam portion 25 includes the final gear 45 and the final gear. A rotation angle of δ × 2 is added by a meshing gap generated between the fourth gear 44 meshing with the wheel 45. As an example, assuming that the specified angle γ = 90 ° is an angle δ = 0 ° 38 ′, the rotation angle when the protruding cam portion 25 is broken is: angle γ + 2 × angle δ = 90 ° + 2 × 0 ° 38 '= 91 ° 16'. Thus, since the rotation angle does not change from a predetermined angle, the idling of the valve can be reliably prevented.

  As shown in FIGS. 11, 13, and 15, an indicator portion 26 is formed at the distal end portion 25 b of the protruding cam portion 25 so as to protrude upward along the side surface 21 a of the motor 21. The indicator portion 26 rotates integrally with the protruding cam portion 25, and the indicator portion 26 is provided in a size that can be seen from the upper direction and the side surface direction of the actuator body 2, thereby rotating the protruding cam portion 25. Is easier to check from outside.

  As shown in FIG. 12, two limit switches 24 are provided in the case body 20, and are arranged in the space region T of the motor side surface 21a. The limit switch 24 is fixed to a mounting projection 62 provided on the case body 20 by a retaining ring 61 in the vicinity of the end side when the protruding cam portion 25 rotates, and a corner portion of the rectangular portion 20b of the case body 20 Placed in. Between the limit switches 24, 24, a control unit 27 including a capacitor and a substrate for controlling the limit switch 24 is disposed.

  When the final gear 45 rotates, the protruding cam portion 25 comes into contact with any one of the limit switches 24 and is turned on, and the rotation state of the final gear 45, that is, the rotation state of the output shaft 23 is transmitted to the limit switch 24. It is possible. In this manner, the fully open or fully closed position of the actuator body 2 can be detected by the limit switch 24. At this time, the operating state of the actuator body 2 can be confirmed by visually checking the protruding cam portion 25 from the outside.

  A wiring retainer 31 is provided between the reduction gear group 22 and the case body 20, and the wiring retainer 31 has a through hole 63, and an output stage shaft 64 provided in the through hole 63 below the final stage gear 45. And the rotation shaft 46 of each gear of the reduction gear group 22 pass therethrough so that the rotation operation of the output stage shaft 64 and the rotation shaft portion 60 is not hindered. The wiring retainer 31 is fixed in a state where it is placed on the placement surface 35 of the case body 20. A wiring (cable) 37 for the motor 21, limit switch 24, and control unit 27 is disposed on the bottom surface 36 of the case body 20, and this cable 37 is housed on the bottom surface 36 side of the case body 20 by the wiring retainer 31. The cable 37 is drawn out of the actuator body 2 through the communication hole 48 and connected to a device (not shown).

  In this case, in a small actuator, a commercially available cable bush (not shown) is usually used in order to improve the airtightness by holding the cable 37 for wiring and preventing the passage of moisture and moisture from the outer periphery of the cable sheath 37a. It is often used by using a rubber bush or by crushing an internal rubber member with a metal or resin bush.

  However, when a commercially available cable bush is used, there is a problem that it is costly and versatility is required, so that the incorporated product cannot be made compact. Furthermore, the cable bush is generally incorporated by screwing or panel mounting, but in this case, there is a possibility that the state of ensuring airtightness varies from one installer to another.

On the other hand, when a rubber bush is used, the size and shape of the outer sheath of the cable generally vary widely, and in order to maintain airtightness only with this rubber bush, the cable passing portion It is necessary to make the gap as small as possible by making the dimensions as small as possible. As a result, it becomes difficult to pass the cable and the workability is deteriorated.
In order to ensure airtightness and cable holding function, it is necessary to secure both the cable passage part and the part to be installed in the case body. The rubber bush must be crushed greatly during construction. For this reason, workability is deteriorated not only when a cable is passed but also when it is assembled.

On the other hand, in the case of bushes made of metal or resin, in general, when these bushes are assembled, the rubber is crushed by press-fitting into the case body, and the cable sheath function and airtightness are installed at the outer periphery of the cable sheath and the part where it is installed in the case body However, in order to press-fit these bushes, a dedicated press jig is required. In addition, since it is necessary to secure the strength of both the bush and the bushing side so as to be able to withstand press-fitting, it is difficult to make it compact.
When a metal or resin bush is used as a screw-in type, a dedicated press jig is not required, but the strength and space of the screw-in part are required, making it difficult to achieve compactness.

Accordingly, in the valve actuator shown in FIGS. 20 and 21, the cable is attached to the compact case body 20 of the actuator using the O-ring 100 and the adhesive 101 while ensuring airtightness. It is what I did.
As shown in the drawing, a taper portion 103, an O-ring storage portion 104, an adhesive filling portion 105, and an adhesive introduction portion 106 are provided in the communication hole 48 for attaching the cable at the position where the cable 37 of the case body 20 is assembled. It has been.

  The taper portion 103 is provided in order to smoothly reduce the diameter of the O-ring 100 and allow the O-ring 100 to be pushed into the back, and an O-ring storage portion 104 is formed on the back side following the taper portion 103. The adhesive filling unit 105 is provided with an appropriate adhesive 101 so that the adhesive introduction unit 106 can insert a dispenser (quantitative discharge device) (not shown) for filling the adhesive filling unit 105 with the adhesive 101. In this embodiment, it is provided in the direction orthogonal to the axial center of the communication hole 48 and at the bottom of the case body 20.

  The O-ring 100 attached to the O-ring storage portion 104 is provided with an inner peripheral diameter and an outer peripheral diameter that can maintain the sheath outer peripheral portion 37a of the cable 37 and the case body 20 and can maintain airtightness. The adhesive 101 is made of a material that prevents the O-ring 100 from popping out when the adhesive filling portion 105 is filled, and holds the O-ring 100 together with the O-ring 100 to maintain airtightness.

  An adhesive stopper plate 107 can be attached to the diameter expansion side of the adhesive filling portion 105. By providing the adhesive stopper plate 107, leakage of the poured adhesive 101 to the outside is prevented, and the adhesive filling portion is provided. The adhesive 101 can be evenly filled in 105.

  When attaching the cable 37 to the case body 20, the O-ring 100 is attached to the distal end side of the cable 37, and the cable 37 is inserted into the communication hole 48 of the case body 20 using a jig (not shown). At this time, the O-ring 100 is accommodated in the O-ring storage portion 104 so as to be gradually reduced in diameter by the tapered portion 103 of the communication hole portion 48. Therefore, the O-ring 100 can be stored at a specified position in the O-ring storage unit 104 with a small insertion force. Subsequently, the jig is removed, and the adhesive stopper plate 107 is brought into contact with the enlarged diameter side of the communication hole 48 while passing through the cable 37. In this state, a dispenser is set in the adhesive introduction portion 106, and a predetermined amount of the adhesive 101 is poured into the adhesive filling portion 105 in a state where the communication hole portion 48 is closed with the adhesive stopper plate 107.

  As described above, the adhesive 101 is poured into the adhesive filling portion 105 using a dispenser after insertion of the cable 37 equipped with the O-ring 100, thereby preventing the O-ring 100 from popping out. In addition, since the adhesive 101 is hardened in the adhesive filling portion 105, the holding function and the airtightness of the cable 37 are increased as compared with the case where the O-ring is attached alone. Therefore, the crushing allowance of the O-ring 100 can be designed to the minimum, the cable 37 can be easily passed, and workability is improved. Thus, since the cable 37 is attached by providing the case body 20 with the communication hole 48 having the O-ring storage portion 104 and the adhesive filling portion 105, the overall size of the actuator is reduced without increasing the size of the case body 20. The cable 37 can be provided to be connectable while maintaining the above.

  In addition, the provision of the adhesive stopper plate 107 prevents the adhesive 101 from flowing out until the adhesive 101 is hardened. At this time, the cable 37 hangs down by its own weight until the adhesive 101 is solidified, and the weight of the cable 37 prevents the cable 37 from falling due to a frictional force acting on the O-ring 100.

  Since the adhesive 101 is filled from the adhesive filling portion 105 to the adhesive introduction portion 106, after the adhesive 101 is hardened, in addition to holding the cable 37 with its fixing force, preventing the disconnection. Thus, since the adhesive 101 of the adhesive introduction part 106 is caught by the case main body 20, a stronger removal preventing function is exhibited.

Furthermore, by making the adhesive stopper plate 107 transparent, it is possible to visually confirm the filling amount of the adhesive 101 into the adhesive filling portion 105, and it is possible to prevent the filling amount from being varied by the installer.
Alternatively, the adhesive 101 may be applied to fill the hole on the outer peripheral side of the cable sheath 37a and between the insulator 37b and the core wire 37c included in the cable 37 shown in FIG. At this time, not only the airtightness on the outer periphery side of the cable sheath 37a but also the water can be prevented from being transmitted through the inside of the cable 37 due to a capillary phenomenon.

  As described above, since the air tightness on the outer peripheral side of the cable sheath 37a is ensured by the O-ring 100 and the adhesive 101, it becomes possible to achieve double air tightness, and the air tightness compared with the case of using only the O-ring. Is expensive. As a result, the crushing allowance of the O-ring 100 can be designed to a minimum, and the workability is improved by facilitating passage through the cable 37. Since the O-ring storage portion 104 and the adhesive filling portion 105 are provided in the case main body 20, the case main body 20 is not increased in size and the entire actuator can be made compact.

  22 and 23 show a state in which the limit switch 24 control board 110 and the capacitor 111 are housed in the case body 20 of FIG. 20, and these board 110 and capacitor 111 are the limit of the case body 20. It is housed between the switches 24, 24. Cables 37 such as a limit switch cable, a motor cable, and an input / output cable are collectively connected to the board 110 by solder (not shown). When the board 110 is stored in the case body 20, each cable 37 is connected to the actuator 110. Pass around the inside of the case main body 20 so as to bypass the parts, pass between the wiring retainer 31 and the bottom surface 36 of the case main body 20, and combine them with a binding band (not shown) near the communication hole 48. I made it. As a result, when the substrate 110 and the capacitor 111 in the case main body 20 are disposed, the cable 37 can be arranged by effectively utilizing the limited space left in the case main body 20, and the overall compactness is ensured. it can.

  The output shaft 23 is made of metal, and the upper side of the output shaft 23 is press-fitted into a metal final stage gear 45 and provided coaxially with the final stage gear 45 so as to be connectable to the stem 7. Near the intermediate position of the output shaft 23 is rotatably attached to the case body 20 via a bearing 65 and an O-ring 66, and a concave groove that can be fitted to the parallel two-surface portion 12 of the stem 7 at the tip of the output shaft 23. 67 is formed.

  The actuator body 2 decelerates the rotation of the motor 21 through the above components and outputs it to the output shaft 23, and transmits it to the stem 7 via the parallel two-surface portion 12 fitted in the concave groove 67 of the output shaft 23. The rotation of the valve body 5 can be controlled to a predetermined opening degree. The actuator body 2 is for rotating operation of a so-called quarter-turn rotary valve. As described above, when the output shaft 23 (final stage gear 45) is controlled to rotate at a rotation angle of approximately 90 °, this rotation is performed. The state is displayed outside by the protruding cam portion 25.

The cover body 32 is formed of a transparent or translucent resin, and a bulging portion 68 for housing the motor 21, the protruding cam portion 25, and the indicator portion 26 is bulged. The cover body 32 is surface-processed by, for example, a textured process, and is provided with a transparent or translucent visual recognition part 70 by not providing a textured process in the vicinity where the protruding cam part 25 of the bulging part 68 is located. The operating state of the indicator part 26 can be visually recognized from the outside of the cover body 32 through the visual recognition part 70.
The cover body 32 is joined to the case body 20 by, for example, ultrasonic welding.

On the other hand, as shown in the hatched area of the two-dot chain line in FIG. 4, a fitting recess 71 for attaching the connection plate body 3 is formed on the bottom surface 36 surrounding the output shaft 23 of the actuator body 2. The fitting recess 71 is formed in a shape that can be fitted into a fitting cylinder 72 (described later) provided in the connection plate body 3.
An attachment / detachment portion 73 for attaching / detaching the connection plate body 3 protrudes from the outer peripheral side of the actuator bottom surface 36, and a pair of female screw portions to which a male screw portion 75 of a fixing pin 74 described later can be screwed is attached to the attachment / detachment portion 73. Two sets of 76 are formed. The female thread portion 76 is formed in the radial direction at a predetermined angle θ (for example, 30 °) in the lateral direction of the stem 7.

  As shown in FIG. 7, a flange 80, a fitting cylinder 72, and a fitting hole 81 are formed in the connection plate 3 for connecting the valve 1 and the actuator 2. The flange portions 80 are alternately formed in pairs with respect to the connection plate body 3 for mounting to the valve 1, and the end portions 80 a of the respective flange portions 80 are female screws 80 b that are screwed with the male screws 10 a of the bolts 10. Is formed. The end portion 80a of the flange portion 80 and the mounting portion 9 of the valve 1 described above can be secured by screwing a bolt 10 inserted through the through hole 11 from below the mounting portion 9. A reinforcing rib 80 c is formed on the bottom surface side of the flange portion 80.

  Between the pair of flange portions 80, 80, a pair of fitting tube portions 72, 72 are formed to project, and the fitting tube portion 72 is provided in a shape that can be fitted into the fitting recess 71. By fitting the fitting recess 71 into the portion 72, the actuator body 2 can be temporarily attached to the connection plate body 3 while positioning. The flange portion 80 and the fitting cylinder portion 72 are provided in a point-symmetric shape with respect to the center (not shown) of the connection plate body 3.

  8 and 9, two sets of bottomed mounting holes 82 and 82 are formed on the outer periphery in the lateral direction of the fitting cylinder portion 72 in the radial direction. The mounting hole 82 corresponds to the position of the female screw portion 76 and is formed on the same plane in the height direction by the same predetermined angle (30 ° in the present embodiment) θ as the female screw portion 76. The mounting hole 82 includes a tapered hole portion having a reduced diameter at the tip, and the tip 74 a of the fixing pin 74 can be mounted in the mounting hole 82. The two sets of mounting holes 82 and the internal thread portion 76 are arranged symmetrically with respect to the fitting cylinder portion 72.

  The fitting hole 81 is formed at the center position of the fitting cylinder portion 72 of the connection plate body 3 and has a hole diameter that can be fitted into the stem shaft mounting portion 6. By fitting the fitting hole 81 into the stem shaft mounting portion 6, the connection plate body 3 can be temporarily attached to the valve 1 while positioning.

  In FIG. 8, the fixing pin 74 is provided to connect the actuator body 2 and the connection plate body 3 while positioning them. A tapered portion 83 is provided at the distal end 74a of the fixing pin 74. Following this tapered portion 83, a male screw portion 75 that is screwed into the female screw portion 76 of the actuator body 2 and a head portion 84 for rotational operation are provided. Yes.

  The taper portion 83 is formed at a predetermined taper angle (not shown) that can be attached to the mounting hole 82, so that when the male screw portion 75 is screwed into the female screw portion 76, the taper portion 83 follows the mounting hole 82. Positioned. Thereby, the connection plate body 3 and the actuator body 2 are fixed in a state where they are accurately positioned at predetermined positions. As shown in the drawing, it is sufficient that a threaded portion is formed only in a portion that is screwed to the female threaded portion 75 and the female threaded portion 76, and an intermediate portion thereof may be omitted. In this case, since the external thread part 75 screwed to the internal thread part 76 is reduced, the work of tightening or loosening the fixing pin 74 is simplified.

  A concave portion 85 that can be rotated in one direction by a tool such as a general tool (not shown) is formed in the head portion 84, and the fixing pin 74 can be loosened by rotating with the tool through the concave portion 85. ing. On the other hand, it is possible to tighten the fixing pin 74 by gripping the outer periphery of the head portion 84 by hand or rotating it by an arbitrary method such as a special tool. The concave portion 85 can be provided in an appropriate shape as long as it is a rotation operation with a general tool attached. The shape of the head 84 is loosened using a tool such as a general tool and is clamped by an arbitrary method such as gripping by hand or using a special tool. It is also possible to provide it.

With the above configuration, as shown in FIG. 2, the connection plate body 3 for connecting the actuator is fixed to the outer peripheral top surface portion 8 on the stem shaft mounting side of the body 4, and the actuator body 2 is mounted on the connection plate body 3. The valve 1 and the actuator body 2 are detachably provided by a connection mechanism 90 including a fixing means that is inserted and removed from a lateral direction that intersects the axial direction of the stem 7.
The connection mechanism 90 has a structure in which an attaching / detaching portion 73 of the actuator bottom surface 36 in which a pair of female screw portions 76, 76 is formed and a tip 74 a of a fixing pin 74 screwed into the attaching / detaching portion 73 are positioned and fixed in the mounting hole 82. Consists of.

  In the above embodiment, the valve 1 is a ball valve, but a butterfly valve may be used as long as the valve can be driven by the actuator body 2. Also in this case, the actuator body 2 can be provided in a detachable structure as in the case of the ball valve. Moreover, although the actuator main body 2 is an electric type, it may be a pneumatically driven actuator.

  Although the parallel two-surface portion 12 is provided on the upper end side of the stem 7 of the valve 1 and the concave groove 67 is provided on the distal end side of the output shaft 23 of the actuator body 2, these may be provided in reverse. Although the number of fixing pins 74 is two, three or more fixing pins 74 may be provided. In this case, the mounting hole 82 and the female thread portion 76 for mounting the fixing pin 74 may be formed in the connection plate body 3 and the actuator body 2 in advance according to the number of the fixing pins 74.

Next, an assembly procedure when the valve 1 and the actuator body 2 described above are connected together will be described.
As shown in FIG. 2 and FIG. 7, the connection plate body 3 is positioned and aligned with the valve 1 while the stem shaft mounting portion 6 is inserted into the insertion hole 81 and the flange portion 80 is placed on the attachment portion 9. The male screw 10a is screwed onto the female screw 80b of the flange portion 80 from the lower body 4 side of the flange portion 80 through the through hole 11 of the attachment portion 9, and the bolt 10 is temporarily fixed. Accordingly, the connection plate body 3 is temporarily fixed while being positioned in the lateral direction with respect to the valve 1.

In this state, the port 5a of the valve body 5 is fully opened so as to be parallel to the flow path 4a, while the actuator body 2 is also adjusted to the fully open position.
As shown in FIG. 8 (a), the fitting cylinder portion 72 is fitted into the fitting recess 71 while the parallel two-surface portion 12 is fitted in the concave groove 67, and the connection plate body is interposed between the valve 1 and the actuator body 2. 3 is attached, and the valve 1 and the actuator body 2 are temporarily attached. The connection plate body 3 is disposed in the gap S between the outer peripheral top surface portion 8 of the valve 1 and the bottom surface 36 of the actuator body 2. At this time, since the flange part 80 and the fitting cylinder part 72 of the connection plate body 3 have a point-symmetric shape, the actuator body 2 can be connected to the valve 1 in a state rotated by 180 °.

  Next, the male screw portion 75 of the fixing pin 74 is screwed onto the female screw portion 76, and the tip 74 a of the fixing pin 74 is attached to the attachment hole 82 of the fitting cylinder portion 72. By mounting the fixing pin 74, the actuator body 2 is positioned and fixed in a coaxial state with the fitting cylinder portion 72 of the connection plate body 3 fixed to the valve 1. At this time, by tightening the fixing pin 74 while holding the valve 1 and the actuator body 2 in the fully opened state, the port 5a is in a state parallel to the flow path 4a at the fully opened position of the actuator body 2, and the normal mounting position is obtained. Can be positioned while adjusting.

Further, the position of the valve 1 in a temporarily fixed state with the bolt 10 on the flange portion 80 is finely adjusted with respect to the actuator body 2, and the bolt 80 is fastened in this state, whereby more accurate positioning can be performed. When the bolt 80 is fixed, the mounting portion 9 is formed so as to protrude in the lateral direction of the body 4, so that the bolt 10 can be tightened from below the mounting portion 9 without interfering with the valve 1. Thereby, the valve 1 and the actuator body 2 can be integrated without shifting the fully open position of the actuator body 2 and the fully open position of the port 5a with respect to the flow path 4a.
Since the mounting portion 9 and the flange portion 80 are alternately projected, interference with the fitting cylinder portion 72 which is a portion where the connecting plate body 3 is attached to and detached from the actuator body 2 is avoided, and a space necessary for attachment and detachment is provided. Secured.

  When removing the actuator 2 from the valve 1, the actuator 2 is detached from the valve 1 and the connection plate body 3 by loosening the fixing pin 74 as shown in FIG.

  In this way, the valve 1 and the actuator body 2 can be attached and detached via the connection plate body 3. At the time of connection, the insertion hole 81 of the connection plate body 3 is inserted into the stem shaft mounting portion 6 of the body 4. The stem 7 and the output shaft 23 are positioned in the coaxial direction and the height direction by fitting the fitting recess 71 of the actuator body 2 into the fitting cylindrical portion 72 of the connection plate body 3. In this state, the connection plate body 3 Can be fixed. As shown in FIG. 8A, by arranging the connection plate body 3 in the gap S between the valve 1 and the actuator body 2, when connecting in FIG. 3 and FIG. 6, they are integrated while suppressing the overall height. Can be

  At that time, since the tips 74a of the two fixing pins 74 are mounted in the mounting holes 82 formed in the radial direction, the two fixing pins 74 are fixed while being supported by the two fulcrum portions which are the contact portions of the fixing pins 74. The tilting of the actuator body 2 can be prevented, and the fixing pin 74 can be prevented from loosening even when the stem 7 rotates.

  Moreover, the connection plate body 3 can be positioned by fixing the fixing pin 74 to either one of the two female screw portions 76 and the mounting hole 82 formed at the symmetrical position of the connection plate body 3, thereby reducing the maintenance space. However, the fixing pin 74 can be loosened or tightened from an arbitrary lateral direction depending on the connection direction of the valve 1 or the actuator body 2. If the fixing position by the fixing pin 74 is changed as necessary, the actuator body 2 and the valve 1 can be arranged flexibly in a limited installation space in the device. Since the fixing pin 74 can be attached and detached, the workability is excellent.

  In this case, by providing the angle θ of the two fixing pins 74 and 74 at an acute angle, it is possible to obtain a friction force that is greater than that when there is only one fixing pin 74, and increasing the friction force by providing the angle θ at a more acute angle. It becomes possible to make it. The increase in the frictional force improves the function of preventing the fixing pins 74 and 74 from rotating in the axial direction and preventing the fixing pins 74 from loosening and coming off.

  The valve 1 and the actuator body 2 are connected to each other by a connecting mechanism 90 having a structure for positioning and fixing a detachable portion 73 formed with a pair of female screw portions 76, 76 and a tip 74 a of a fixing pin 74 screwed into the detachable portion 73. The mounting hole 82 is formed in a tapered hole portion with a reduced diameter at the tip, and the taper portion 83 of the fixing pin 74 is attached to the tapered hole portion 82 so that the actuator body 2 can be connected. The positioning accuracy with the plate body 3 is further increased. At this time, since a frictional force acts on the mounting hole 82 from the tapered portion 83, a sufficient tightening strength can be obtained by hand tightening. Furthermore, since the frictional force generated by the thrust of the fixing pin 74 is transmitted to the connection plate body 3, the opposite side connection plate body 3 to which the fixing pin 74 is attached is prevented from being lifted. If there is only one fixing pin 74, when a rotational force in the rotational direction of the stem 7 is generated on the fixing pin 74, the frictional force is greatly reduced by a small amount of operation, and the fixing pin 74 is loosened. It becomes easy to do.

  As described above, the connection plate body 3 for connecting the actuator 2 is fixed to the outer peripheral top surface portion 8 of the body 4 on the stem shaft mounting side, the actuator 2 is mounted on the connection plate body 3, and the axial direction of the stem 7 is set. Since the valve 1 and the actuator 2 are detachably provided by the connection mechanism 90 including a fixing means that is inserted / removed from the intersecting lateral direction, a gap is provided when the connection plate body 3 is mounted between the valve 1 and the actuator 2. The connection mechanism 90 and the reinforcing rib 80c of the connection plate are accommodated in the area S, and the distance between the actuator 2 and the valve 1 can be reduced, and the overall height can be kept low, so that the size can be reduced as much as possible. This space saving allows easy installation in a narrow installation space while positioning.

  Moreover, the pair of flange portions 80, 80 of the connection plate body 3 are fixed to the pair of attachment portions 9, 9 formed to be equal to or less than the outer peripheral top surface portion 8 of the body 4 with the bolts 10 from below the attachment portion 9. As a result, the height dimension of the attachment / detachment part between the valve 1 and the actuator main body 2 by the connection plate body 3 can be further reduced, and the insertion recess 71 of the actuator main body 2 is fitted into the fitting cylinder 72 of the connection plate body 3. The height of the attachment / detachment part of the valve 1 and the actuator main body 2 by the connection plate body 3 is reduced by reducing the height of the stem shaft mounting portion 6 by positioning the actuator main body 2 on the connection plate body 3. It is also possible to suppress to the limit. As a result, the entire rotary valve with actuator can be made as compact as possible.

  When the valve 1 and the actuator body 2 are connected, as described above, they can be easily integrated while improving the mounting accuracy by fixing them with the fixing pins 74 and bolts 10 through the connection plate body 3 while being fully opened. It is possible to connect to a predetermined state without adjusting the flow path 4a every time it is connected.

  The valve actuator according to the present invention is provided with a reduction gear group 22 in the lower surface region R of the motor 21 or inside the motor 21, and a protruding cam portion 25 is fixed to the final gear 45 of the reduction gear group 22. 25 is extended from the bottom surface of the motor 21 and slightly protrudes from the outer periphery of the final gear 45, and the limit switch 24 is disposed in the space area T on the side surface of the motor, and the limit is set by rotating the protruding cam portion 25. Since the switch 24 is contacted and separated, a large space is required between the valve 1 and the actuator body 2, the actuator body 2 is extended upward, and the reduction gear group 22 is disposed. The projecting cam portion 25 is provided while reducing the overall size without greatly extending the entire lateral direction, and the projecting cam portion 25 is visually recognized from the outside. Confirmation of the de valve opening is possible.

  In this case, by using the protruding cam portion 25 for turning on / off the limit switch 24 for the valve opening display, the valve opening display portion is provided in the space-saving space of the actuator body 2 with the minimum number of parts. This makes it possible to achieve a compact size.

  Further, an indicator portion 26 is formed by projecting the tip end portion 25b of the protruding cam portion 25 upward along the side surface 21a of the motor 21, and the cover body is provided via a transparent or translucent visual recognition portion 70 provided on the cover body 32. Since the operation state of the indicator part 26 can be visually recognized from the outside of 32, the indicator part 26 can be visually recognized from the upward direction and the side surface direction of the actuator body 2 or can be visually recognized from a long distance without looking into from the outside. The valve opening can be easily recognized.

20 Case body 21 Motor 21a Side surface 22 Reduction gear group 24 Limit switch 25 Projection cam part 25a Rear end part 25b Front end part 26 Indicator part 30 Ground plate 30b Lower surface 31 Wiring retainer 32 Cover body 33, 55 Bearing part 36 Bottom face 45 Final gear 45a Shaft portion 46 Rotating shaft 47 Lower end 56 Upper end 57 Stopper pin 58 Stopper portion 63 Through hole 64 Output stage shaft 70 Visual recognition portion R Lower surface region T Space region

Claims (8)

  A reduction gear group is provided in the lower surface area of the motor provided in the case body, and a protruding cam portion that rotates in accordance with the rotation of the final gear is fixed to the final gear of the reduction gear group. Extending from the bottom surface of the motor and slightly protruding from the outer periphery of the final gear, a limit switch provided in the case body is disposed in a space area on the side surface of the motor, and the rotation of the protruding cam portion is performed. A valve actuator characterized in that the limit switch is brought into and out of motion by a moving operation.   An indicator part is formed by projecting the tip part of the protruding cam part upward along the side surface of the motor, and a transparent or translucent visual recognition part is provided on the cover body fixed to the case main body. The valve actuator according to claim 1, wherein the operating state of the indicator portion can be visually recognized from the outside of the cover body.   A base plate for fixing the motor is fixed to the case body, and a bearing portion is provided on the lower surface of the base plate for bearing an upper end of a rotation shaft of each gear of the reduction gear group provided in a lower surface region of the motor. The valve actuator according to claim 1 or 2, wherein a lower end of the shaft is supported by a bearing portion provided on a bottom surface of the case body.   A stopper portion for fixing the rear end portion of the protruding cam portion to the shaft portion of the final gear and fixing the protrusions for fixing both sides of the protruding cam portion to the final gear and engaging the protruding portion. 4. The valve actuator according to claim 3, wherein the protrusion cam portion is provided so as to be rotatable by approximately 90 °.   The press-fitting fitting portion provided at the rear end portion of the protruding cam portion is fixed to the shaft portion of the final gear, and the press-fitting fitting is performed by sandwiching both sides of the press-fitting fitting portion with the pair of protrusions. The valve actuator according to claim 4, wherein a protruding cam piece provided at a portion is fixed to the final gear.   The valve actuator according to claim 4, wherein the protrusion is a pair of stopper pins.   A wiring retainer having a through hole penetrating the output stage shaft provided at the lower part of the final stage gear and the rotation shaft of each gear of the reduction gear group is fixed in the case body, and the wiring disposed on the bottom surface of the case body The valve actuator according to claim 1, wherein the wiring retainer is housed.   The valve actuator according to claim 2, wherein the cover body is joined to the case body by ultrasonic welding.

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