JPH09324872A - Valve opening displaying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the break of the tooth of a gear and improve the durability of the gear by forming a gear speed reduction mechanism by an internal mesh type gear in which difference in the number of tooth of an inner gear and an outer gear is few. SOLUTION: An outer gear 53 is stored in a case 51 under such a condition that the shaft hole 53b of the outer gear 53 is fitted to an eccentric collar 54 and the outer teeth 53a thereof are partially engaged with the inner teeth 51b of an inner gear 51a. An internal mesh type gear is formed by these inner gear 51a and outer gear 53. In a valve opening display device 50, a gear speed reduction mechanism is formed by the internal mesh type gear in which difference in the number of tooth of the inner gear 51a and the outer gear 53 is few, thereby the tooth profiles of the gears 51a, 53 can be formed larger in comparison with the teeth profiles of the gear by the conventional planetary gear device and large strength can be secured in the tooth profiles, thus the break of the teeth of the gears 51a, 53 can be prevented so as to improve the durability of the gears 51a, 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve opening degree display device for displaying the opening degree of a valve body in a valve for adjusting a flow rate such as a sluice valve or a globular valve mounted on a fluid pipe, for example, a water pipe. .

[0002]

2. Description of the Related Art For example, a sluice valve, as is well known, includes a valve box having a fluid passage, a valve body for vertically partitioning the fluid passage, and an opening / closing movement of the valve body in a direction orthogonal to the direction of the fluid passage by rotation. And a valve passage for opening and closing the fluid passage by the movement of the valve element based on the rotation of the valve rod. The rotation speed of the valve rod required to move the valve element from the fully closed position to the fully open position is usually about 15 to 25 times.

Therefore, at the intermediate opening of the valve body, it is difficult to grasp how much the valve body is actually open, and there is a problem that the flow rate cannot be adjusted accurately. As a solution to this problem, conventionally, a valve that reduces the rotation of a valve rod by a reduction gear mechanism using a planetary gear device and transmits it to a display rotor, and displays the amount of rotation of the display rotor as the opening degree of the valve body. An opening display device has been proposed.

A conventional reduction gear mechanism is shown in a schematic view in FIG. In FIG. 15, the reduction gear mechanism is the valve rod 1
00, a sun gear 101 fixed to 00, an internal gear 102 fixed to a member on the fixed side by a gear shaft having the same axis as the valve rod 100, the sun gear 101 and the internal gear 102 meshed with each other, and a display rotating body 103. And three planetary gears 104 that are rotatably supported, and the rotation of the valve rod 100 is decelerated and transmitted to the display rotor 103.

[0005]

However, according to the conventional valve opening degree display device, since the gear reduction mechanism by the planetary gear device is adopted, the respective gears 101, 102, 104.
The tooth profile of I cannot help but be small. Therefore, each gear 10
Due to insufficient strength of the teeth 1, 102, 104, tooth chipping is likely to occur and durability remains unsatisfactory.

The present invention has been made to solve the above problems, and an object of the present invention is to improve durability by preventing tooth breakage of gears constituting a gear reduction mechanism. It is to provide a valve opening display device capable of performing the same.

[0007]

According to the invention of claim 1, which solves the above-mentioned problems, in a valve which opens and closes a fluid passage of a valve box by movement of a valve body based on rotation of a valve rod, the rotation of the valve rod is decelerated. A valve opening degree display device that decelerates by a gear mechanism and transmits it to a display rotating body, and displays the rotation amount of the display rotating body as the opening degree of a valve body, which is fixed by a gear shaft that forms the same axis as the valve rod. An internal gear fixed to the side member and an external gear provided rotatably around the eccentric axis of the valve rod and rotatably connected to the display rotor, and the difference in the number of teeth between the internal gear and the external gear. The valve opening degree display device is characterized in that the gear reduction mechanism is configured by an intermeshing mesh type gear having a small number of.

In the valve opening degree display device according to the present invention, in the reduction gear mechanism for decelerating the rotation of the valve rod by the intermeshing mesh type gear and transmitting it to the display rotating body, the external gear is valved by the rotation of the valve rod. By revolving around the axis of the rod, the external gear rotates around the eccentric shaft while meshing with the internal gear, causing a rotational deviation due to the difference in the number of teeth with the internal gear, which reduces the rotational deviation of the external gear. This rotation is transmitted to the display rotating body. Therefore, according to the internally meshing gears that form the gear reduction mechanism, the tooth profile of each gear can be made larger than the tooth profile of the gear by the conventional planetary gear device, and a large strength is secured in the tooth profile. Therefore, it is possible to prevent tooth breakage of each gear and improve durability.

A second aspect of the present invention is the valve opening degree display device according to the first aspect, further comprising an extension spindle connected to the valve stem of the valve, wherein the opening degree of the valve element is determined based on the rotation of the spindle. It is a valve opening degree display device characterized by displaying.

According to the valve opening degree display device of the present invention, the opening degree of the valve body can be displayed at a position closer to the side where the valve stem is operated than the valve. This is convenient because a person can easily visually check the opening degree of the valve body.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments 1 and 2 of the present invention will be described in order. [Embodiment 1] Embodiment 1 will be described with reference to FIGS. Since the valve opening degree display device of the present embodiment is applied to a water sluice valve, an outline of the sluice valve will be first described and then described in detail. The gate valve is shown in FIG. 1 in a partially cutaway front view and in FIG. 2 in a partially broken side view. 1 shows the valve closed state and FIG. 2 shows the valve opened state.

The sluice valve G shown in FIGS. 1 and 2 is, for example, a sluice valve made of ductile cast iron, and has a valve box 8 having a fluid passage 8a and a valve body 10 for opening and closing the fluid passage 8a.
And a valve rod 5 that moves the valve body 10 in a direction orthogonal to the direction of the fluid passage 8a by rotation.

The valve box 8 is mounted on the valve box 8 via a gasket 21 and fixed by fastening bolts and nuts 19, and an O-ring 22 is placed on the valve cover 4. The packing box 2 is placed and fixed by the mounting bolts 20. The packing box 2 has a valve lid 4
Supporting flange 5 of valve rod 5 in cooperation with upper flange 4a of
An O-ring case 16 is internally installed so as to rotatably hold a. On the inner peripheral surface of the O-ring case 16, a packing 3 that provides a seal with the valve rod 5 is provided. On the outer peripheral surface of the O-ring case 16, an O-ring 23 that seals with the packing box 2 is provided. A thrust washer 17 is interposed between the upper flange 4 a of the valve lid 4 and the support flange 5 a of the valve rod 5.

A shaft portion extending below the support flange 5a of the valve rod 5 is a screw shaft 5b. This screw shaft 5
Since b is attached to the upper end portion of the valve body 10, it is screwed into a screw hole (reference numeral omitted) of the screw top 6. Also valve body 1
0 has a space portion 10a in which the screw shaft 5b intervenes. A ring-shaped valve seat 9 is attached to the mating surface between the valve body 10 and the valve box 8 so as to overlap in a closed state when the valve body 10 is fully closed.

An upper end portion of the valve rod 5 projects upward from the packing box 2, and a cap 1 is fitted to an engaging portion 5c having a substantially rectangular prism shape at the upper end portion and a cap set screw 2 is provided.
It is fixed by 4. On the inner peripheral surface of the upper end of the packing box 2, a dust seal 1 that serves as a seal with the valve rod 5 is formed.
8 are provided. The cap 1 has an engaging portion 1a having a substantially quadrangular prism shape on the upper portion thereof.

In the sluice valve G, an operating tool (not shown) is engaged with the engaging portion 1a of the cap 1, and the valve rod 5 is rotated by the operating tool, so that the valve shaft 5 is screwed onto the screw shaft 5b. The valve body 10 is moved in the direction orthogonal to the direction of the fluid passage 8a (the vertical direction in the drawing) through the screwing or unwinding of 6, thereby opening and closing the fluid passage 8a.

Next, the valve opening degree display device 50 provided on the sluice valve G will be described in detail. The valve opening degree display device 50 displays the opening degree of the valve body 10 based on the rotation of the valve rod 5 of the sluice valve G. A side view is shown in FIG. 3, a plan view is shown in FIG. 4, and a sectional view is shown in FIG. It is shown. 3 to 5, the valve opening degree display device 50 includes a case 51, a cover plate 52, an external gear 53, and an eccentric collar 54 as main components.
Hereinafter, each component will be described, but for convenience of explanation,
The case 51, the eccentric collar 54, the external gear 53, and the cover plate 52 will be described in this order. The valve opening display device 50
Is installed in the sluice valve G before the cap 1 is attached to the valve rod 5.

The case 51 will be described with reference to FIG. 7A is a plan view and FIG. 7B is a side sectional view.
7 (c) is a front view showing the periphery of the embedded screw,
FIG. 3D is a front view showing a peripheral portion of the mounting screw insertion hole.

In FIGS. 7A and 7B, the case 51
Is a resin molded product, and is formed in a substantially stepped cylindrical shape. The upper half of the case 51 has a larger diameter than the lower half. An internal gear 51a having an appropriate number of internal teeth 51b (for example, 31 is shown in the figure) is formed on the inner peripheral surface of the upper half of the case 51. In the lower half portion of the case 51, a mounting portion 51c that can be fitted to the upper end portion of the packing box 2 of the sluice valve G is formed. This mounting part 5
A boss portion 51d is bulged on the front surface of 1c, and an embedded screw 60 is insert-molded in the boss portion 51d (see FIG. 7C). Further, a mounting screw insertion hole 51e is formed on the back surface of the mounting portion 51c (FIG. 7).
(D)).

As shown in FIGS. 3 and 5, in the case 51, the mounting portion 51c is fitted to the upper end of the packing box 2 of the sluice valve G, and the fixing screw 57 is passed through the insertion hole 51e so that the packing box 2 can be secured. It is fixed to the packing box 2 by being tightened in a screw hole (reference numeral 2a in FIG. 5).
As a result, the case 51 having the internal gear 51a forms a gear shaft having the same axis as the valve rod 5 (see axis L _{1 in} FIG. 5).
Is fixed to the packing box 2 corresponding to the fixed member.

An indicator plate 55 is fixed to the boss portion 51d of the case 51 with a mounting screw 58. Indicator board 5
Reference numeral 5 is substantially formed of a metal strip plate material. Specifically, FIG. 11 (a) is a plan view, FIG. 11 (b) is a front view, and FIG.
As shown in the side sectional view, the upper end portion thereof has an L-shaped bent triangular pointer portion 55a, and the lower end portion thereof has a mounting screw insertion hole 55b. The upper surface of the pointer portion 55a is colored red, for example.

As shown in FIG. 5, the indicator plate 55 is attached to the front surface of the boss portion 51d of the case 51 by inserting the mounting screw 58 into the insertion hole 55b and fastening the mounting screw 58 to the embedded screw 60 of the case 51. It is fixed. At this time, the pointer portion 55a is directed toward the valve rod 5. In addition, the indicator plate 55 is the vertical groove portion 51 formed on the front surface of the case 51.
By being fitted to f (see FIGS. 7 (a) to 7 (c)), it is positioned in an upright position.

Next, refer to FIG. 10 for the eccentric collar 54.
It will be described in the light. FIG. 10A is a plan view and FIG. 10B is a cross section.
FIG. In FIG. 10, the eccentric collar 54 is a flat surface.
As shown in the sectional view of FIG.
It has a ring shape and the axis L ₁Inner peripheral surface centered on
54a (also referred to as a shaft hole) and the axis L₁Eccentric to
Eccentric shaft (axis L in the figure)_TwoOuter peripheral surface 5 centered on
4b and. Further, the shaft hole 54a is the valve rod.
The upper part of 2 is formed with a diameter that can be fitted with almost no gap.
Have been. The thick portion of the eccentric collar 54 has a radial direction.
A screw hole 54c is formed so as to pass through.

As shown in FIG. 5, the eccentric collar 54 has its shaft hole 54a fitted on the upper portion of the valve rod 5 and has a collar set screw 59 passed through the screw hole 54c and fastened to the valve rod 5. , Is fixed to the valve rod 5.

Next, the external gear 53 will be described with reference to FIG. 9A is a plan view and FIG. 9B is a sectional view. In FIG. 9, the external gear 53 is made of a resin molded product and has external teeth 53a on its outer peripheral surface. External teeth 53a
Has a tooth profile substantially the same as the internal teeth 51 of the internal gear 51a of the case 51. The number of external teeth 53a is 30 which is one less than the number of internal teeth 51b of the internal gear 51a. A shaft hole 53b is provided in the shaft center portion of the external gear 53. The shaft hole 53b is formed with a diameter that allows the eccentric collar 54 to be fitted with substantially no space. Further, the external gear 53 is formed with a plurality of (four in the figure are shown) pin holes 53c located at equal intervals on one circumference (see line L3 in FIG. 9A).

As shown in FIG. 5, the external gear 53 has its shaft hole 53b fitted in the eccentric collar 54 and its external teeth 53.
It is housed in the case 51 in a state where a is partially meshed with the internal teeth 51b of the internal gear 51a. The internal gear 51a and the external gear 53 constitute an internally meshing gear.

Next, the cover plate 52 will be described with reference to FIG. FIG. 8A is a plan view and FIG. 8B is a sectional view.
In FIG. 8, the cover plate 52 is made of a resin molded product and is formed into a substantially disc shape. An opening hole 52a into which the valve rod 5 can be inserted is provided at the axial center of the cover plate 52. An annular flange portion 52b is formed on the outer peripheral portion of the lower surface of the cover plate 52, and a plurality of locking pieces (four are shown in the figure) projecting downward are formed at the tip edge of the flange portion 52b. 52c are formed at substantially equal intervals. The locking piece 52c is provided with a claw portion 52d inside the lower end thereof.

On the lower surface of the cover plate 52, a plurality of (see FIG.
Projecting pins 52e (shown individually) are formed. The projecting pins 52e are located at equal intervals on a circle having the same diameter as the circle in which the pin hole 53c of the external gear 53 is arranged (see line L3 in FIG. 8A). The protrusion height h of the protrusion pin 52e is
It is formed smaller than the thickness of the external gear 53. The diameter of the protruding pin 52e is the same as that of the pin hole 5 of the external gear 53.
It is smaller than the diameter of 3c. Specifically, the diameter of the pin hole 53c is A (see FIG. 9A), and the diameter of the protruding pin 52e is B.
(See FIG. 8B). When the distance (eccentricity) between the axis lines L ₁ and L ₂ of the eccentric collar 54 is C (see FIG. 10A), the relation of A = B + 2C is satisfied. Each dimension A,
B and C are set.

As shown in FIG. 5, the cover plate 52 has the case 51 with its opening hole 52a inserted into the valve rod 5.
Is attached to cover the upper surface. Specifically, the flange portion 52b is externally fitted to the upper end portion of the internal gear 51a of the case 51, and the claw portion 52 of the locking piece 52c is provided.
The d is elastically locked to a stepped portion (reference numeral omitted) on the outer periphery of the internal gear 51a, so that it is rotatably attached to the case 51. At this time, each protruding pin 52e is engaged with the corresponding pin hole 53c of the external gear 53. The protruding pin 52e of the cover plate 52 and the pin hole 53c of the external gear 53 are engaged with each other to form a crossed shaft coupling.

Further, on the upper surface of the cover plate 52, an opening degree seal 56, which is an adhesive sticker in which a scale 56, a numeral, a symbol, etc. indicating the opening degree of the valve body 10 are clearly shown, is attached. A plan view of the opening seal 56 is shown in FIG. In the illustrated display 56a, S indicates the fully closed position, O indicates the fully open position, and the numbers near the scale indicate the rotation speed of the valve rod 5 from the fully closed position. Further, the cover plate 52 to which the opening degree seal 56 is attached corresponds to the display rotating body in the present invention.

In the valve opening display device 50 described above, when the valve rod 5 is rotated to open and close the valve body 10 of the sluice valve G, the external gear 53 causes the valve gear 5 to move through the eccentric collar 54.
By revolving around the axis of, the external gear 53 rotates around the eccentric collar 54, that is, around the eccentric axis while engaging with the internal gear 51a of the case 51. Then, the external gear 53
At the same time, a rotational deviation occurs due to the difference in the number of teeth with the internal gear 51a.

For example, in the explanatory view of the operation of the reduction gear mechanism of FIG. 6, when the valve rod 5 rotates in the clockwise direction (see arrow X _{1 in the} drawing), the external gear 53 of the valve rod 5 moves through the eccentric collar 54. It revolves around the axis L ₁ in the same direction. At this time, the external gear 53 rotates while meshing with the internal gear 51a. However, since the internal gear 51a has 31 internal teeth 51b and the external gear 53 has 30 external teeth, one rotation of the valve rod 5 occurs. As a result of the external gear 53 being displaced by one tooth, the external gear 53 is displaced by the eccentric collar 54.
Around the eccentric axis L _{2 in the} opposite direction (in the figure,
Rotate to arrow X ₂ ). When the valve rod 5 is rotated in the opposite direction, the external gear 53 rotates in the opposite direction to the above.

The rotation shift of the external gear 53 is transmitted to the cover plate (display rotating body) 52 as a rotation of the rotation of the valve rod 5 through a shaft coupling of a pin hole 53c and a projecting pin 52e engaged with the pin hole 53c. To be done. Then, in FIG. 4, the cover plate 52
Is rotated, and the display 5 of the opening seal 56 is displayed according to the rotation amount.
The opening of the valve body 10 of the sluice valve G is displayed by the corresponding portion of 6a corresponding to the pointer portion 55a of the indicator plate 55.

Further, in the valve resolution display device 50, since the gear reduction mechanism is constituted by the intermeshing meshing type gear in which the difference in the number of teeth between the internal gear 51a and the external gear 53 is small, each of the gears 51a and 53 is It is possible to make the tooth profile larger than the tooth profile of the gear by the conventional planetary gear device,
Great strength can be ensured in the tooth profile, and thus tooth breakage of the gears 51a and 53 can be prevented and durability can be improved.

[Second Embodiment] A second embodiment will be described with reference to FIGS. 13 and 14. Since the second embodiment is a modification of the first embodiment, the changed portions will be described in detail, and the portions having the same or substantially the same configuration as those of the first embodiment will be denoted by the same reference numerals. Therefore, duplicate description will be omitted. 13 is a partially cutaway side view of the valve opening display device 50, and FIG. 14 is the valve opening display device 50.
FIG.

As shown in FIG. 13, the second embodiment includes an extension spindle 71 connected to the valve rod 5 of the sluice valve G, and displays the opening degree of the valve body 10 based on the rotation of the spindle 71. The valve opening degree display device 50. Specifically, the spindle 71 is attached to the engaging portion 1a of the cap 1 on the valve rod 5.
The socket 73 at the lower end of is engaged. In addition, an engaging portion 71 a having a substantially rectangular prism shape is formed on the upper end portion of the spindle 71. A cap 72 having the same shape as that of the cap 1 is fitted to the engaging portion 71 a and is fixed by a cap stop bolt 74. This cap 7
2 also has a substantially square pillar-shaped engaging portion 72a on the upper portion thereof. Therefore, the valve rod 5 of the sluice valve G can be rotated by engaging the engaging portion of the cap 72 with an operating tool (not shown) and rotating the spindle 71.

On the other hand, in the ground where the sluice valve G is buried, it has a substantially cylindrical shape as shown in FIGS. 13 and 14, and the lower end portion surrounds the peripheral portion of the valve rod 5 of the sluice valve G. At the same time, an enclosure wall portion 76 having an upper end portion as an operation port (not shown) located on the ground surface is installed. The operation port is usually covered with an openable / closable lid, and is opened when the gate valve G is operated to close the enclosure wall portion 7.
It is possible to insert the operation tool into 6.

The spindle 7 is attached to the surrounding wall portion 76.
The steady rest member 80 made of a plate material having a boss portion 80a that fits in the substantially central portion of the No. 1 is supported. The mounting portion 51c of the case 51 of the valve opening display device 50 is fitted on the boss portion 80a of the steady rest member 80 and fixed by the fixing screw 57 as in the case of the first embodiment.

The eccentric collar 54 has its shaft hole 54a fitted to the spindle 71 as shown in FIG. 13 and is fixed to the spindle 71 by a collar set screw 59 as in the first embodiment. Other configurations are the same as those of the first embodiment, and in this case also, the valve opening degree display device 5 is installed before the cap 72 is attached to the spindle 71.
0 shall be equipped.

According to the valve opening degree display device 50 of the second embodiment,
Since the opening degree of the valve body 10 can be displayed at a position closer to the side that operates the valve rod 5 than the sluice valve G, that is, a position closer to the operation port of the enclosure wall portion 76, work for opening and closing the sluice valve G This is convenient because a person can easily visually recognize the opening degree of the valve body 10. For example, when the valve opening degree display device 50 displays the opening degree of the valve body 10 based on the rotation of the valve rod 5 as in the case of the first embodiment, the valve opening degree display device 50 is located below the wall 76 of the enclosure. Since it is located deep, the display is dark and difficult to see even if illuminated with a light, but according to the present embodiment, such a problem can be improved.

The present invention is not limited to the above embodiment, but can be modified without departing from the scope of the present invention. For example, the difference in the number of teeth between the internal gear 51a and the external gear 53 is not limited to one and can be changed to two or three. Further, the indicator plate 55 may be provided on the cover plate 52 and the opening seal 56 may be provided on the case 51. Also in this case, the indicator plate 55 and the opening degree seal 56 are arranged so as to be easily seen from the operating side. Further, the display 56a is not limited to a seal, and may be painted on the lid plate 52, or what is written on the plate may be adhered to the lid plate 52.

[0042]

According to the present invention, the durability can be improved by preventing the gear teeth constituting the gear reduction mechanism from chipping.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a water supply sluice valve.

FIG. 2 is a partially cutaway side view of the same sluice valve.

FIG. 3 is a side view of the opening degree display device according to the first embodiment.

FIG. 4 is a plan view of the opening degree display device.

FIG. 5 is a cross-sectional view of the opening degree display device.

FIG. 6 is an operation explanatory view of a reduction gear mechanism.

FIG. 7 is an explanatory diagram of a case.

FIG. 8 is an explanatory diagram of a lid.

FIG. 9 is an explanatory diagram of an external gear.

FIG. 10 is an explanatory diagram of an eccentric collar.

FIG. 11 is an explanatory diagram of a pointing plate.

FIG. 12 is an explanatory diagram of an opening seal.

FIG. 13 is a partially cutaway side view of the opening degree display device according to the second embodiment.

FIG. 14 is a plan view of the opening degree display device.

FIG. 15 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 5 Valve Rod 8 Valve Box 8a Fluid Passage 10 Valve Disc 50 Valve Opening Indicator 51a Internal Gear 52 Cover Plate (Display Rotating Body) 53 External Gear 71 Spindle

Claims (2)

[Claims] 1. In a valve that opens and closes a fluid passage of a valve box by movement of a valve body based on rotation of a valve rod, the rotation of the valve rod is decelerated by a reduction gear mechanism and transmitted to a display rotating body, and the display rotation is performed. A valve opening degree display device for displaying a rotation amount of a body as an opening degree of a valve body, wherein an internal gear fixed to a fixed member by a gear shaft having the same axis as the valve rod, and an eccentric shaft of the valve rod. The gear reduction mechanism is configured by an internally meshing gear with a small number of teeth difference between the internal gear and the external gear, the external gear being rotatably provided around and connected to the display rotary body for transmission. A valve opening display device characterized in that 2. The valve opening display device according to claim 1, further comprising an extension spindle connected to a valve stem of the valve, wherein the opening of the valve element is displayed based on rotation of the spindle. Valve opening display device.