JP3970131B2 - Valve drive device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drive device for a valve body of a valve such as a ball valve or a butterfly valve, and more particularly to a valve drive device that can accurately acquire opening information of the valve body and can adjust the opening degree with high accuracy.
[0002]
[Prior art]
Conventionally, a valve using a ball valve, a butterfly valve, or the like is widely known as a valve that is installed in a piping line of a building facility or a water treatment facility to open / close a flow path or adjust a flow rate. Many drive devices for driving the motor have been proposed. Among such driving devices, for example, a differential gear type valve driving device having a valve body opening degree instruction plate as disclosed in JP 2000-193136 A has been proposed. As shown in FIG. 7, this valve drive device 10 is provided with the opening degree indicating plate 6 on an opening degree indicating shaft 4 integrated with an output shaft 2 connected to a valve stem (not shown) of the valve. The rotation shaft of the output shaft 2 is easily instructed.
[0003]
[Problems to be solved by the invention]
However, since the conventional valve drive device has a structure that acquires the opening information of the valve body via the output shaft of the speed reducer that drives the valve body, the opening information indicated by the opening indicator plate is strictly Only shows the rotation angle of the output shaft of the speed reducer, and it may not always be possible to know the opening information of the valve body that the user actually wants to acquire.
[0004]
For example, if the output shaft and valve stem connection part is loosened, and there is an error in the rotation angle of the output shaft and the opening of the valve body, or there is backlash, or for some reason the connection part of the output shaft and valve stem In the case where a malfunction occurs, it may be impossible to know the exact opening of the valve body, making it impossible to appropriately open / close the flow path or adjust the flow rate.
[0005]
The present invention has been made to solve such a problem, and while achieving downsizing and space saving of the apparatus, at the same time, it is possible to accurately acquire the opening information of the valve body, and it is highly accurate. An object of the present invention is to provide a valve drive device capable of adjusting the opening degree.
[0006]
[Means for Solving the Problems]
The present invention includes a reduction gear composed of an inscribed planetary gear reduction mechanism having a slight difference in the number of teeth, and a valve body can be driven via a valve rod connected to an output shaft of the reduction gear. In the drive device, the input shaft of the speed reducer is arranged coaxially with the output shaft, and both the input / output shafts are hollow shafts to form a hollow portion that penetrates the entire speed reducer, and the valve rod Further, the above-mentioned problem is solved by providing an opening guide for the valve body that rotates by the rotation of the valve rod, and making the opening guide visible using the hollow portion.
[0007]
According to the present invention, the input shaft of the speed reducer is arranged coaxially with the output shaft, and both the input / output shafts are hollow shafts to form a hollow portion that penetrates the entire speed reducer, and Since the opening guide of the valve body provided on the valve stem and rotated by the rotation of the valve stem is made visible using the hollow portion, the state of the valve stem can be directly grasped from the outside of the apparatus. In particular, since it is possible to grasp the rotation state of the valve stem from the input shaft side that operates the valve body, it is possible to perform an appropriate operation while grasping the rotation state. For example, an input planetary gear speed reducer having a slight difference in the number of teeth that can be transmitted to the output shaft by decelerating the rotation of the input shaft by an input shaft connected to a handle, an output shaft connected to a valve stem, and the like. In a manual valve drive device having a speed reducer composed of a mechanism, the input shaft and the output shaft are arranged coaxially, and both the input / output shafts are hollow shafts, thereby penetrating the entire speed reducer. If the valve stem is visible using the hollow portion in the state where the handle is attached by forming the hollow portion to be used, the valve body can be appropriately adjusted by the handle while grasping the rotation state of the valve stem. Can be operated.
[0008]
Further, the opening degree guide can be provided directly at the tip of the valve rod without using another member. Therefore, for example, even when a failure occurs in a member such as a connecting portion between the valve stem and the output shaft, the opening degree information of the valve body can be obtained accurately, and the opening degree adjustment with high accuracy can be performed. Is possible.
[0009]
If the valve stem has a valve stem extension that penetrates through the hollow portion, and the opening guide is provided at the tip of the valve stem extension, the position of the opening guide is more easily seen (for example, In the vicinity of the handle for operating the valve, the operability can be further improved. In addition, since the valve stem extension portion of the valve stem is not a portion directly used for driving the valve body, the shaft diameter can be reduced. Therefore, if the shaft diameter of the valve stem extension is reduced and a gap is provided between the inner periphery of the hollow portion and the valve stem, a wire such as a temperature sensor is passed through the gap, or cooling is performed. It is also possible to fill the fluid.
[0010]
In addition, if the valve stem can be separated into an opening pointer shaft constituting the valve stem extension and a valve stem main body connected to the valve body, the opening pointer shaft is prepared as a separate body. In the above, rotary valve such as an existing ball valve or direct acting type valve can be diverted to the valve stem main body, and while achieving cost reduction, it can be used with multiple types of valve stems at the same time. Combinations are possible.
[0011]
Further, the opening guide shaft is provided with a valve rod connecting portion engageable with the output shaft connecting portion of the valve stem main body connected to the output shaft, and the output shaft connecting portion of the valve stem main body. On the other hand, if both the output shaft and the opening guide shaft are connectable, the opening guide shaft can be easily attached to the valve stem body.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0013]
FIG. 1 is a cross-sectional view of the periphery of a valve driving device 200 when the valve driving device 200 according to an example of the embodiment of the present invention is applied to a rotary valve 300, and FIG. 2 is viewed from an arrow II in FIG. It is a top view. However, in FIG. 2, the handle 110 portion of the valve driving device 200 is not shown for convenience of explanation.
[0014]
In this example, the valve stem 304 of the rotary valve 300 includes a valve stem body 304a and an opening guide shaft (valve stem extension) 304b. The upper end side 304a2 (upper side in FIG. 1) of the valve stem main body 304a is connected to the output shaft 210 of the speed reducer 250 of the valve driving device 200. The valve stem main body 304a is rotated along with the rotation of the output shaft 210. It can rotate around the center L1. In addition, the shape of the upper end side 304a2 of the valve stem main body 304a is standardized by the ISO standard, and has a substantially cubic shape. On the other hand, the output shaft 210 of the speed reducer 250 connected to the valve stem body 304a is provided with a recess 210b that can be engaged with the upper end side 304a2 of the valve stem body 304a. It can also be connected to the valve stem.
[0015]
The opening pointer shaft 304b is a rod-shaped member having a smaller diameter than the valve stem body 304a, and the lower end side 304b1 of the opening pointer shaft 304b is connected to the valve stem body 304a by a bolt (not shown). Has been. Further, an opening pointer 100 of a valve body (not shown) that is rotated by the rotation of the valve rod 304 is attached to the upper end (upper tip) side 304b2 of the opening pointer shaft 304b.
[0016]
As shown in FIG. 2, the opening pointer 100 is rotatable about the shaft center L1 of the valve stem 304 in the direction R2 along with the rotation of the valve stem 304, and is attached to the valve stem 304. The degree of opening (not shown) is shown. Note that the input side casing 220 of the valve drive device 200 is provided with arrows 102a and 102b that are indications of the degree of opening. In this example, the arrow 102a has an opening of 0 ° and the arrow 102b has an opening of 90 °. Respectively.
[0017]
Next, the speed reducer 250 of the valve drive device 200 will be described in detail with reference to FIGS. 3 is a side sectional view of the speed reducer 250, and FIGS. 4 and 5 are a plan view and a bottom view thereof.
[0018]
The speed reducer 250 of the valve driving device 200 employs an internal planetary gear mechanism having a slight difference in the number of teeth, and includes an input shaft 202, a carrier 204, an external gear 206, an internal gear 208, An output shaft 210 and an eccentric body 212 are provided.
[0019]
The input shaft 202 is formed of a hollow shaft having a hollow portion 202a, is disposed coaxially with an output shaft 210, which will be described later, and is rotatable about the same axis L1 as the valve rod 304.
[0020]
An inner pin 204 a is integrally provided on the carrier 204, and the inner pin 204 a is loosely fitted in an inner pin hole 206 a provided in the external gear 206. The carrier 204 is maintained in a fixed state by the input side casing 220.
[0021]
The external gear 206 has external teeth such as a trochoidal tooth profile and an arc tooth profile on the outer periphery, and is in mesh with the internal gear 208.
[0022]
The internal gear 208 has a structure in which an outer pin (not shown) is fitted in a plurality of circular grooves formed on the inner peripheral surface of the ring-shaped member, and these outer pins form inner teeth.
[0023]
The eccentric body 212 has an outer periphery that is eccentric with respect to the axis L1, is provided so as to be rotatable integrally with the input shaft 202, and swings and rotates the external gear 206.
[0024]
The output shaft 210 is formed of a hollow shaft having a hollow portion 210 a, similar to the input shaft 202, and is rotatable about the same axis L 1 as the input shaft 202.
[0025]
Both the input shaft 202 and the output shaft 210 are hollow shafts having hollow portions 202a and 210a, respectively. As a result of being arranged coaxially, hollow portions 250a (202a and 210a) penetrating the entire speed reducer 250 are formed, The above-described valve stem 304 (valve stem extension 304b) can be inserted into the hollow portion 250a. A gap s1 is provided between the inner periphery 202a1 of the hollow portion 250a (more specifically, the inner periphery of the hollow portion 202a of the input shaft 202) and the valve stem 304.
[0026]
Next, returning to FIG. 1, the operation of the valve driving device 200 will be described.
[0027]
When the handle 110 is rotated, the input shaft 202 rotates about the axis L1, and the eccentric body 212 provided on the input shaft 202 rotates eccentrically. Due to the rotation of the eccentric body 212, the external gear 206 mounted on the eccentric outer periphery also oscillates and rotates around the input shaft 202, but its rotation is constrained by the carrier 204. The external gear 206 only swings while being inscribed in the carrier 204.
[0028]
As the external gear 206 swings, the internal gear 208 corresponds to the difference in the number of teeth from the external gear 206 every time the external gear 206 swings (every rotation of the input shaft 202). And the rotation of the internal gear 208 is transmitted to the output shaft 210 to achieve deceleration.
[0029]
In the speed reducer 250 of the valve drive device 200 according to the example of the embodiment of the present invention, the input shaft 202 is rotated by rotating the internal gear 208 and the output shaft 210 while maintaining the carrier 204 in a fixed state. And the rotation direction of the output shaft 210 coincide with each other. As a result, the rotation direction of the handle 110 and the rotation direction of the valve body can be made the same, and it is easy to operate sensibly and an improvement in operability is realized.
[0030]
Finally, the power transmitted to the output shaft 210 causes the valve body to be rotationally driven through the valve rod main body 304a of the valve rod 304 connected to the output shaft 210.
[0031]
Further, along with the rotation of the valve body, the opening pointer 100 provided on the valve rod 304 (opening pointer shaft 304b) of the valve body rotates, and the opening information of the valve body can be acquired.
[0032]
According to the valve drive device 200 according to the example of the embodiment of the present invention, the input shaft 202 of the speed reducer 250 is arranged coaxially with the output shaft 210, and both the input / output shafts 202 and 210 are formed as hollow shafts. A hollow portion 250a that penetrates the entire speed reducer 250 is formed, and the opening degree pointer 100 of the valve body that is provided on the valve rod 304 and rotates by the rotation of the valve rod 304 is visible using the hollow portion 250a. Therefore, the state of the valve stem 304 can be directly grasped from the outside of the valve driving device 200. In particular, since it is possible to grasp the rotation state of the valve stem 304 from the handle 110 side that operates the valve body, it is possible to perform an appropriate operation while grasping the rotation state.
[0033]
Furthermore, the opening degree guide 100 can be provided directly on the tip 304b2 of the valve stem 304 without using another member. Therefore, for example, when a problem occurs in a member such as the connecting portion 210b of the valve stem 304 and the output shaft 210, or when the connecting portion 210b of the valve stem 304 and the output shaft 210 is loosened, the valve element is opened. Even when there is an error or backlash in the rotation shaft of the output shaft 210, the opening information of the valve body can be obtained accurately, and the opening adjustment with high accuracy is possible. Furthermore, if necessary, a wire such as a temperature sensor can be passed through the gap s1 provided between the inner periphery 202a1 of the hollow portions 202a and 210a and the valve stem 304, or a cooling fluid can be filled. It is.
[0034]
Further, since the valve stem 304 can be separated into the valve stem body 304a and the opening pointer shaft 304b, the opening pointer shaft 304b is prepared as a separate body, and an existing ball valve or the like is provided in the valve stem body 304a. The rotary valve and the direct acting type valve can be diverted, and at the same time, it is possible to combine with a plurality of types of valve stems while realizing cost reduction.
[0035]
Further, as shown in FIG. 6, the opening degree guide 100 is provided with a valve stem connecting portion 504 b 1 that can be engaged with the output shaft connecting portion 504 a 1 of the valve stem main body portion 504 a connected to the output shaft 210, and the valve stem If both the output shaft 210 and the opening pointer shaft 504b can be connected to the output shaft connecting portion 504a1 of the main body 504a, the opening pointer shaft 504b can be easily attached to the valve stem main body 504a. become able to. In this example, the opening guide shaft 504b is provided with a recess as a valve stem connecting portion 504b1 that can be engaged with the output shaft connecting portion 504a1 of the valve stem main body 504a. Therefore, the opening guide shaft 504b and the valve stem body 504a can be easily connected to each other, and it is not necessary to perform threading or the like, so that the production is easy and the cost can be reduced.
[0036]
In the above embodiment, since the valve stem is separated into the valve stem main body 504a and the opening guide shaft 504b, the opening information of the valve body is acquired via the opening guide shaft 504b. However, since torque from the valve body is always applied to the output shaft coupling portion 504a1 between the output shaft 210 and the valve stem body portion 504a, fretting and wear problems are likely to occur. Such a problem is unlikely to occur in the valve stem connecting portion 504b1 with the main body portion 504a. Therefore, the reliability of the opening information of the valve body is much higher than the conventional method of acquiring the opening information of the valve body via the output shaft.
[0037]
In the above embodiment, the valve stem 304 can be separated into the valve stem main body 304a and the opening guide shaft 304b, but the present invention is not limited to this. Therefore, for example, the valve stem 304 may have a valve stem extension that passes through the hollow portion 250a, and the opening guide 100 may be provided at the tip of the valve stem extension. The opening guide 100 may be provided directly (without providing the valve stem extension), and the structure may be visible using the hollow portion 250a.
[0038]
Moreover, although the driven device is the rotary valve 300, the present invention is not limited to this and may be applied to a direct acting type valve or the like.
[0039]
Furthermore, although the valve drive device 200 is a device that includes only the speed reducer 250 configured by the inscribed planetary gear speed reduction mechanism, the valve drive device 200 includes other speed reducers such as a parallel shaft gear speed reduction mechanism. May be good.
[0040]
【The invention's effect】
According to the present invention, it is possible to provide a valve drive device that can accurately obtain the opening information of the valve body and can adjust the opening degree with high accuracy while realizing downsizing and space saving of the device. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of the periphery of a valve driving device. FIG. 2 is a plan view as viewed from the direction II in FIG. 1. FIG. 3 is a side cross-sectional view of a speed reducer of the valve driving device. 5 is a bottom view of FIG. 3. FIG. 6 is a second embodiment of a valve driving device. FIG. 7 is a conventional valve driving device.
DESCRIPTION OF SYMBOLS 100 ... Opening pointer 110 ... Handle 200 ... Valve drive device 202 ... Input shaft 204 ... Carrier 206 ... External gear 208 ... Internal gear 210 ... Output shaft 220 ... Input side casing 222 ... Output side casing 250 ... Reducer 300 ... Rotary valve 304a, 504a ... Valve stem body 304b, 504b ... Opening pointer shaft

Claims (6)

In a valve drive device comprising a reduction gear constituted by an inscribed planetary gear reduction mechanism having a slight difference in the number of teeth, and capable of driving a valve body via a valve rod connected to an output shaft of the reduction gear,
The input shaft of the speed reducer is arranged coaxially with the output shaft,
By forming a hollow portion penetrating the entire speed reducer by making both the input and output shafts hollow shafts,
An opening guide for the valve body rotated by rotation of the valve stem is provided on the valve stem, and the opening guide is made visible by using the hollow portion. In claim 1,
The valve stem has a valve stem extension extending through the hollow portion; and
A valve driving device characterized in that the opening guide is provided at the tip of the valve stem extension. In claim 2,
The valve drive device according to claim 1, wherein the valve stem is separable into an opening guide shaft constituting the valve stem extension and a valve stem body connected to the valve body. In claim 3,
The opening guide shaft is provided with a valve rod connecting portion that can be engaged with the output shaft connecting portion of the valve stem main body connected to the output shaft,
The valve drive device characterized in that both the output shaft and the opening guide shaft can be connected to the output shaft connecting portion of the valve stem main body. In any one of Claims 1 thru | or 4,
A valve driving device characterized in that a gap is provided between an inner periphery of the hollow portion and the valve rod. An input shaft coupled to the handle, an output shaft coupled to the valve stem, and an inscribed planetary gear speed reduction mechanism having a slight difference in the number of teeth that can be transmitted to the output shaft by decelerating the rotation of the input shaft; In the drive device for manual valves equipped with the speed reducer composed of
The input shaft and the output shaft are arranged coaxially,
By forming a hollow portion that penetrates the entire speed reducer by making both the input and output shafts hollow shafts, the handle is attached,
A manual valve driving device characterized in that the valve rod is visible using the hollow portion.

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