JPH0680967U - Valve opening and closing device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a valve opening / closing device, the input shaft and output shaft are concentric with each other, and the rotation directions are also the same. [Structure] An external gear 3 fitted into an eccentric cylinder 2 of an input shaft 1 is eccentrically rocked and meshed with an internal gear 7 provided on an output shaft 5,
The pin 4 fixed to the upper case 6 is engaged with a hole provided in the external gear to rotate the output shaft 5 only without revolving. This causes the output shaft 5 to rotate in the same direction as the input shaft 1. A pointer 9 for opening is provided on the outer surface of the output shaft 5, and the upper case 6 and the lower case 8 support the input shaft 1 and the output shaft 5 coaxially while the pointer 9
The range of rotation of is opened so that the opening can be confirmed from the input shaft side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve opening / closing device for a valve such as a butterfly valve or a ball valve, which relates to a valve opening / closing device using a planetary differential reduction mechanism known to have a large reduction ratio.

[0002]

[Prior art]

 The planetary differential reduction mechanism is also called a hypocycloid reduction mechanism, and a valve opening / closing device that uses this mechanism is provided with a set of internally meshed gears consisting of an internal gear and an external gear, and fixing the internal gear. , When the external gear is rotated so as to revolve around the center of the input shaft and the eccentric cylinder of the input shaft, the external gear rotates in the direction opposite to the revolving direction because it meshes internally with the internal gear. As a mechanism to take out this rotation, it is taken out to the output shaft by a method that uses an adjustment hole and a pin that have high transmission efficiency, are easy to process, and occupy a small space. A valve opening / closing device equipped with this planetary differential reduction mechanism can be made smaller because it has a large reduction ratio, but on the other hand, the rotation direction of the input shaft and output shaft is reversed, so that the valve operating axis side such as an eccentric butterfly flap valve is operated. When mounted on a valve that turns clockwise when viewed, the valve is closed by a counterclockwise operation, and the opposite is the case where a valve is closed by a general clockwise operation. Therefore, it is used only as an opening / closing device for valves such as butterfly valves and ball valves that close even when rotated counterclockwise. In addition, since the input shaft and output shaft rotate in opposite directions, there is a problem that the rotating direction is apt to be mistaken when operating. In addition, compared to the worm gear type opening / closing device that is most often used for valves, the number of components is increased, higher machining accuracy is required, and the wedge effect of the eccentric cylinder part of the input shaft causes the radius to change. Since a large force acts in the direction, it was necessary to give strength to each place as well, and the price was high.

[0003]

[Problems to be solved by the device]

 The object of the present invention is to eliminate the above-mentioned drawbacks and use a differential reduction mechanism so that the input shaft and the output shaft rotate in the same direction. That is, the external gear fitted to the eccentric cylinder of the input shaft eccentrically oscillates and rotates in mesh with the internal gear provided on the output shaft, and the external gear does not rotate but revolves around the fixed pin and external gear. Make sure the holes provided are engaged. In this case, the pin is fixed on the input shaft side, which is the opposite side of the rotating output shaft, making it difficult to retrieve the opening instruction to check the rotation angle of the output shaft from the input shaft side. This is to make the display of the opening clearly visible when viewed from the input shaft side, which is the operating shaft, and to make the device inexpensive without compromising compactness.

[0004]

[Means for Solving the Problems]

 The present invention solves the above problems and secures the necessary strength while pivotally supporting the rotating parts inside, and the outer circumference of the output shaft originally built in the case is part of the case. This idea was able to be completed by skillfully using and combining the idea that I thought and the shape of the case.

That is, first, in order to rotate in the same direction, the external gear 3 fitted to the eccentric cylinder 2 of the input shaft 1 eccentrically swings and meshes with the internal gear 7 provided on the output shaft 5, The pin 4 fixed to the upper case 6 is engaged with the hole provided in the external gear 3 so that the external gear 3 does not rotate but only revolves. Naturally, in order to allow the eccentric oscillation of the external gear 3, the diameter of the pin 4 must be smaller than the diameter of the hole by twice the eccentric amount. Then, the outer surface of the output shaft 5 is taken out to the outer surface of the case, and a pointer 9 for displaying the opening degree is attached thereto. The upper case 6 and the lower case 8 support the input shaft 1 and the output shaft 5 concentrically, Install so that the range of rotation of the pointer 9 is open. Then, attach the opening display scale 10 to the upper case 6 so that the opening indicated by the pointer 9 can be confirmed from the direction of the input shaft 1.

[0006]

[Action]

 Since the present invention has the above structure, when the input shaft 1 is rotated, the output shaft 5 rotates in the same direction. Therefore, it is possible to eliminate an erroneous operation due to a misunderstanding in operation. In addition, the outer surface of the output shaft 5 is taken out to the same outer surface as the upper case 6 and the lower case 8, and a pointer 9 is attached to the outer surface of the output case 5 to open the rotation range of the pointer 9 of the upper case 6 and the lower case 8. The opening of the output shaft 5 can now be clearly confirmed from the operating direction of the input shaft 1.

[0007]

【Example】

 An embodiment will be described based on FIG. The input shaft 1 has an eccentric cylinder 2, and an external gear 3 is fitted in the eccentric cylinder 2. The external gear 3 has a hole that engages with the pin 4 fixed to the upper case 6, and the diameter of the hole allows the eccentric oscillation of the external gear 3 and is larger than the diameter of the pin 4 so as not to rotate. The output shaft 5 has an internal gear 7 that meshes with the external gear 3 and rotates. Upper case 6 and lower case 8 support input shaft 1 and output shaft 5 concentrically. The outer surface of the output shaft 5 is taken out to the outer peripheral surface of the upper case 6, and the pointer 9 is fixed there. The upper case 6 and the lower case 8 have the rotation range of the pointer 9 open, and are fixed with bolts 11 outside the rotation range. A part of the output shaft 5 is fitted inside the upper case 6 and serves as a bearing and a guide for mounting. The upper case 6 also has a scale 10 for indicating the opening. Packing 12 is provided to make the inside a sealed structure. The valve body 13 is fixed to the lower case 8 with bolts, and the valve shaft 14 is fitted with the output shaft 5.

[0008]

【effect】

 The present invention, as a valve opening / closing device for a co-rotating valve that uses a planetary differential reduction mechanism, was able to locate the position where the degree of opening was most easily confirmed with the minimum number of components. In addition, it contributed to downsizing of the valve as a whole, and the simple structure could be manufactured at low cost, and since it rotated in the same direction, problems due to erroneous operation were prevented, making it suitable as a valve opening / closing device. In addition, since the opening display can be confirmed from the direction perpendicular to the input shaft, it can now be used in places where there is such a demand.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example.

FIG. 2 is a plan view showing an example.

[Fig. 3] An elevation view showing an embodiment as seen from the pointer side.

[Explanation of symbols]

 1 Input Shaft 2 Eccentric Tube 3 External Gear 4 Pin 5 Output Shaft 6 Upper Case 7 Internal Gear 8 Lower Case 9 Pointer 10 Opening Scale

Claims (1)

[Scope of utility model registration request] The input shaft 1 and the external gear 3 that is fitted with the eccentric cylinder 2 on the input shaft 1.
A pin 4 engaged with a hole of the external gear 3, an upper case 6 to which the pin 4 is fixedly attached to support the input shaft 1 and the output shaft 5, and an internal gear 7 that meshes with the external gear 3 to rotate. Output shaft 5 with
And a valve opening / closing device including a lower case 8 which is coaxially supported by the output shaft 5 and the input shaft 1 and is attached to the upper case 6,
A structure in which a pointer 9 for displaying the opening is attached to the outer surface of the output shaft 5, the upper case 6 or the lower case 8 is opened in a range in which the pointer 9 rotates, and an opening display scale 10 is attached to the upper case 6.