JPH08114275A - Dewing preventive structure in case and motor-operated valve actuator unit - Google Patents

Abstract

PURPOSE: To prevent the occurrence of dew condensation in a case and also rust from gathering in equipment, in this motor-operated valve actuator unit. CONSTITUTION: This motor-operated valve actuator unit is provided with a valve opening indicator 3 equipped with a scale plate 7 and an indicating pointer 8 attached to a shaft 6 rotating in response to the axial travel of a spindle supported with a valve at the lower end, via a gear mechanism 5, a case 4 housing the gear mechanism 5 and the valve opening indicator 3, and a transparent plate 9 to make out any display of the indicating pointer 8 in a part to be opposed to the scale plate 7 built in this case 4. In addition, two vent holes 10 and 11 interconnecting an internal atmosphere of the case 4 and the outside air are formed on a lower wall surface 23 of this case 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dew condensation prevention structure in a case for preventing dew condensation inside a case and the like in which parts such as a detector are housed, and for opening and closing a valve such as a gate valve. The present invention relates to an electric valve actuator device having a dew condensation prevention structure having a spindle drive device that vertically moves a spindle that supports a valve.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 5 and 6, for example, a spindle for supporting a valve 12 for opening and closing a valve 12 such as a gate valve, a water gate, a gate provided in a river or a canal. 2. Description of the Related Art An electric valve actuator device that controls the vertical movement of 2 is known. In the electric valve actuator device, the spindle drive device 18 is
The vertical movement of the spindle 2 supporting the valve 12 can be controlled. On a slab 16 built as a foundation on a bank 15 such as a river or a canal, a housing 1 constituting a support body in which a speed reducer 17 for guiding the vertical movement of a pair of spindles 2 is incorporated, and a spindle drive device 18 are provided. is set up. In general, the slab 16 is provided with a site control panel 19 that controls the operation of the spindle drive device 18. Further, the electric valve actuator device includes the valve 1 housed in the valve opening meter case 4.
It has a valve opening indicator 3 for displaying the opening degree of 2 and a spindle drive device 18 housed in a valve control case 20. Further, the spindle drive device 18
Although not shown, a differential transformer, which is a movement amount sensor in the internal thread wear amount detection device, an amplifier for amplifying an electric signal from the differential transformer, and the like are provided.

The electric valve actuator device is constructed such that a spindle 2 having a gate, a valve and the like at its lower end is reciprocally movable in a vertical direction, that is, an axial direction, in a housing 1 such as a gear case by a spindle drive device.
In the electric valve actuator device, for example, a sleeve 26 (FIG. 9) is rotatably disposed in the housing 1 via a bearing. A worm wheel that constitutes the spindle drive device 18 is fixed to the outer peripheral surface of the sleeve 26, and the worm is meshed with the worm wheel. The worm is rotated by the operation of an actuator controlled manually or by a command from a controller.

Further, the electric valve actuator device is provided with a valve opening indicator 3 for displaying the opening of the valve 12. In the conventional valve opening indicator,
There are a closed type that stores the opening indicator in the case and an open type that does not use the case. A closed valve opening indicator 3 is shown in FIGS. 7 and 8. The valve opening indicator 3
Is a scale plate 7 attached via a gear mechanism 5 to a shaft 6 that rotates in accordance with the amount of axial movement of the spindle 2 in order to indicate the valve opening of the valve 12 with respect to a water gate or the like. A pointer 8 is provided. Since the case 4 accommodating the gear mechanism 5 and the valve opening indicator 3 is visually confirmed by the valve opening indicator 3 provided with the scale plate 7 and the indicator needle 8, the scale plate 7 and the indicator needle 8 are provided. A transparent plate 9 is arranged on the front surface of the.

Further, in the electric valve actuator device, as shown in FIGS. 9, 10 and 11, a vertically moving spindle 2 is arranged in a housing 1, and a spindle cover 13 is attached to an upper end of the housing 1 by a bolt 27. It is fixed. Spindle 2 in the spindle cover 13
The upper part of is arranged. The spindle cover 13 prevents dust and the like from entering the vertically moving region of the spindle 2 and protects it. The upper end of the spindle cover 13 has a rubber cap 24 and a cap 14 for closing the inside of the spindle cover 13. Is attached. A female screw member (not shown) is spline-fitted to the sleeve 26 arranged in the housing 1, and the female screw member is rotatably incorporated together with the sleeve 26.
The upper end of the sleeve 26 is fixed to the lower end of the intermediate pipe member 25 by a joint such as a bolt. The intermediate pipe member 25 arranged in the housing 1 is provided with the sleeve 2
It is rotatable in the housing 1 integrally with 6. In the electric valve actuator device, the rotational movement of the female screw member is converted into vertical movement of the spindle 2, and the vertical movement of the spindle 2 causes the valve 12 to open and close a water gate or the like.

[0006]

By the way, in the conventional electric valve actuator device, the valve opening indicator for indicating the valve opening of the valve 12 with respect to the water gate or the like is of a closed type or an open type. It is known, however, that open type valve opening indicator has troubles such as dust, mud, water, etc. adhering to the wall surface, rusting on the wall surface, malfunction of the indicator needle, and unreadableness. May occur. Further, in the closed type valve opening indicator, the valve opening indicator 3 is housed in the case 4, so that due to the temperature difference between the inside of the case 4 and the outside, the inner wall of the transparent plate 9, the scale plate 7, etc. Condensation occurs, so that the scale itself on the scale plate 7 or where the indicator needle 8 points on the scale plate 7 cannot be confirmed, and a state in which the valve opening cannot be known occurs. Further, since the dew condensation occurs on the inner wall of the case 4, the transparent plate 9, the scale plate 7, etc., there arises a problem that rust is generated on the wall surface of the case 4, the equipment in the case 4, etc., and the equipment is corroded.

Further, in the electric valve actuator device, as shown in FIG. 9, foreign substances such as dust and rainwater which hinder the vertical movement of the spindle 2 are prevented from entering the threaded portion between the spindle 2 and the female screw member. Or a cap 1 on the upper end of the spindle cover 13 in order to prevent a risk of vertical movement of the spindle 2.
4 is provided, but when the cap 14 is attached to the spindle cover 13 and the inside of the spindle cover 13 is cut off from the outside air, the temperature difference between the inside and the outside causes the spindle cover 13
Condensation occurs on the inner wall of the device or on the wall surface of the device incorporated in the spindle cover 13 and water adheres to the wall surface, and water drops and adheres to the device, or accumulates on the bottom of the housing 1. Then, rusting occurs on them and causes corrosion.

Therefore, an object of the present invention is to solve the above-mentioned problems, and devises the structure of the case accommodating the detector equipped with the scale plate and the indicator needle to eliminate the temperature difference between the inside and outside of the case, and Can be freely moved in and out to prevent dew condensation on the wall surface, etc. to prevent the reading of the scale from being obstructed, and to prevent moisture from adhering to the wall surface of the case and equipment due to dew condensation, and to prevent rust on them. To prevent the occurrence of corrosion, prevent their corrosion, and provide a durable anti-condensation structure in the case.

Another object of the present invention is to solve the above-mentioned problems, which is an electric valve actuator device having a dew condensation preventing structure, in which the structure of a case accommodating a valve opening indicator is devised, and particularly, By devising the structure of the spindle cover and its cap, eliminating the temperature difference between the inside and outside, allowing air to flow in and out freely, prevent dew condensation on the wall surface, etc. and eliminate the obstruction of the reading of the scale. To prevent water from adhering to the housing or case wall surface or equipment due to dew condensation, prevent rust from forming on them, prevent them from corroding, and provide a highly durable electric valve actuator device. Is.

[0010]

In order to achieve the above object, the present invention is configured as follows. That is, the present invention provides a detector equipped with a scale plate and an indicator needle, and a case in which a transparent plate for accommodating the detector and for reading the display of the indicator needle is arranged at a portion facing the scale plate. The present invention relates to a dew condensation preventing structure in a case, wherein a through hole is formed in a lower wall of the case so as to communicate the inside atmosphere of the case with the outside air.

The present invention is provided with a dew condensation preventing structure, which is capable of axially moving in the housing by the drive of a spindle driving device, and a spindle having a valve supported at a lower end thereof, and an amount of movement of the spindle in the axial direction. A valve opening indicator equipped with a scale plate and an indicator needle attached to a shaft that rotates in correspondence with a gear mechanism, and an accommodating the gear mechanism and the valve opening indicator and facing the scale plate. In a motor-operated valve actuator device having a case in which a transparent plate for visually recognizing the indication of the indicator needle is arranged at a portion to be connected, a single wall or a plurality of holes for communicating the internal atmosphere of the case with the outside air is provided on the lower wall of the case. The present invention relates to an electric valve actuator device having a hole formed therein. The term "valve" as used herein refers to a device having a movable mechanism capable of opening and closing a passage such as a pipe or a water passage for passing or stopping a fluid or controlling a flow rate.

In this electric valve actuator device, a filter such as a mesh is attached to the through hole.

Alternatively, the present invention is provided with a dew condensation preventing structure, is a spindle which is movable in the axial direction in the housing by the drive of a spindle driving device, and has a lower end supporting a valve, which is attached to the housing. In a valve control device having a cylindrical spindle cover that accommodates an upper portion of the spindle, and a cap attached to an upper end portion of the spindle cover,
An electric valve actuator device, characterized in that a plurality of through holes are formed between the inner peripheral surface of the cap and the outer peripheral surface of the spindle cover and that communicates the internal atmosphere of the spindle cover with the external air. Regarding

[0014]

The structure for preventing dew condensation in the case and the electric valve actuator device according to the present invention are configured as described above, and thus operate as follows. That is, the dew condensation prevention structure in this case is a case in which a detector having a scale plate and an indicator needle is housed and a transparent plate for reading the indication of the indicator needle is arranged at a portion facing the scale plate. The lower wall of the case has a single or a plurality of through holes that communicate the inside atmosphere of the case with the outside air. Therefore, air flows in and out through the through holes, and The temperature difference is eliminated, and dew condensation does not occur on the wall surface of the case or the scale plate, and the position of the indicating needle on the scale plate can be easily read.

In this electric valve actuator device, since the lower wall surface of the case in which the valve opening indicator is arranged is formed with a single hole or a plurality of holes for communicating the inside atmosphere with the outside air of the case. Air flows in and out through the case, the temperature difference between the inside and outside of the case disappears, dew condensation does not occur on the wall surface of the case or the scale of the valve opening indicator, and the indicator needle on the scale does not The position can be easily read. Furthermore, since the valve opening indicator is not an open type, dust, rainwater, etc. do not invade or adhere, and since the through hole is formed in the case, it can be attached to the wall surface of the case, etc. Condensation does not occur, water does not adhere to the walls or devices, rust does not occur on them, and they do not corrode.

Further, by attaching a filter such as a net to the through holes, air can flow in and out through the through holes, but insects, insects, dust due to wind and rain, muddy water, etc. do not enter, and the case It does not adversely affect the equipment inside.

Alternatively, in this electric valve actuator device, a plurality of through holes are formed between the inner peripheral surface of the cap and the outer peripheral surface of the spindle cover for communicating the internal atmosphere of the cylindrical spindle cover with the external air. As a result, air flows in and out of the spindle cover, the temperature difference between the inside and outside of the spindle cover disappears, and there is no dew condensation on the wall surface of the spindle cover or internal equipment, and there is no moisture in them. No adhesion and no rust, no corrosion.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dew condensation preventing structure and an electric valve actuator device according to the present invention will be described below with reference to the drawings. This embodiment describes a valve actuator incorporating a dew condensation prevention structure in a case, an electric valve actuator device such as a water gate opening / closing device, but the dew condensation prevention structure itself in a case is temperature, position of an industrial machine such as a winch, a position, Of course, it can be applied to a device that indicates the opening degree, the speed, and the like.

FIG. 1 is a sectional view showing an embodiment of an electric valve actuator device according to the present invention. Since the embodiment shown in FIG. 1 has the same configuration as that of the example shown in FIG. 7 except that the case has a through hole, the same components are designated by the same reference numerals, and duplicate description will be omitted. .

As shown in FIG. 1, the electric valve actuator device includes a valve opening indicator 3 mounted on a shaft 6 rotating via a gear mechanism 5 corresponding to an axial movement of a spindle, and a valve opening indicator 3. A scale plate 7 and an indicator needle 8 provided on the opening degree indicator 3, a case 4 accommodating the gear mechanism 5 and the valve opening degree indicator 3, and an indicator needle 8 at a portion facing the scale plate 7 incorporated in the case 4. Has a transparent plate 9 for visually recognizing the display. In this electric valve actuator device, in particular, the case 4 is provided on the lower wall 23 of the case 4.
Through holes 10, 11 for communicating the internal atmosphere of the vehicle with the outside air
Are formed. The through holes 10 and 11 are formed by circular holes or slits. At this time, the through hole 10 is formed on the wall surface above the through hole 11, and the passage cross-sectional area of the upper through hole 10 may be made larger than the passage cross sectional area of the lower through hole 11. It is preferable because it facilitates distribution. For example, when the through holes 10 and 11 are formed in a circular shape, the through hole 10 is formed in φ8 and the through hole 11 is formed in φ.
3 is preferable. Of course, even one through hole,
Although it can fulfill its function, it is not always sufficient when compared with a plurality of through holes, although it depends on the shape of the through holes.

Further, a filter made of wire mesh, ceramic fiber or the like is attached to the through holes 10 and 11 formed in the lower wall 23 of the case 4 so that foreign matters such as insects, insects, and dust can pass through the through holes 10 and 11. Invasion into the case 4 is prevented, and the devices in the case 4 are not adversely affected. Further, the through holes 10 and 11 are provided in the lower wall 23 of the case 4.
Since it is installed in the case, rainwater, muddy water, dust, etc. will not enter the case even if exposed to wind and rain,
The inside of the case 4 is always kept clean.

Next, another embodiment of the electric valve actuator device according to the present invention will be described. 2 is a sectional view showing an embodiment of the electric valve actuator device according to the present invention, FIG. 3 is a plan view showing a cap attached to the spindle cover of FIG. 2, and FIG. 4 is a view showing a cap attached to the spindle cover of FIG. It is sectional drawing in line AA. In the embodiment shown in FIGS. 2, 3 and 4, FIG.
The structure is the same as that of the example shown in FIG. 11 except that the structure of the cap is different. Therefore, the same components are denoted by the same reference numerals, and the duplicate description will be omitted.

The electric valve actuator device accommodates a spindle 2 which is movable in the housing 1 in the axial direction by driving a spindle drive device and which supports a valve at its lower end and an upper part of the spindle 2 attached to the housing 1. A cylindrical spindle cover 13 and a cap 2 attached to the upper end of the spindle cover 13.
One. The cap 21 is the spindle cover 1
It is provided to prevent rainwater and dust from entering the inside of the unit 3. Between the inner peripheral surface of the cap 21 and the outer peripheral surface of the spindle cover 13, there are formed a plurality of gaps or through holes 22 (three positions in FIG. 3) for communicating the internal atmosphere of the spindle cover 13 with the external air. . To form the through hole 22, for example, as shown in FIGS.
1 is pressed to form a portion corresponding to the through hole 22 (in the figure,
It can be easily formed by projecting outward at three places spaced by 120 ° in the circumferential direction. Also,
Although the through hole 22 depends on the size of the cap 21, for example, if the depth D of the cap 21 is about 35 mm, the radial gap H is 5 mm and the circumferential length L is 20 to 30 m.
It was confirmed that it is preferable to form the film to a thickness of about m.

In this electric valve actuator device,
By forming the through hole 22, the spindle cover 1
It is possible to prevent air from entering and exiting through the inside and outside of the spindle 3 through the through hole 22, eliminate the temperature difference between the inside and outside of the spindle cover 13, and prevent dew condensation on the wall surface of the spindle cover 13. Therefore, the wall surface of the spindle cover 13 and the internal spindle 2
Water is prevented from adhering to equipment such as the above, or water is prevented from accumulating inside the spindle cover 13, rust is prevented from occurring in the equipment, and corrosion thereof is prevented.

[0025]

Since the dew condensation preventing structure in the case and the electric valve actuator device according to the present invention are configured as described above, they have the following effects. That is, since the dew condensation preventing structure in this case has a single or a plurality of through holes that connect the inside atmosphere of the case and the outside air in the lower wall of the case where the detector or the valve opening indicator is arranged. , Air flows in and out through the through hole, the temperature difference between the inside and outside of the case disappears, and no condensation occurs on the wall surface of the case or the detector or the scale of the valve opening indicator, The position of the indicating needle on the scale plate can be visually recognized. Further, since no condensation occurs on the wall surfaces of the case, there is no adhesion of moisture to the wall surfaces or devices such as oscillators, rust does not occur on them, and they do not corrode and deteriorate. . Also,
Since the through hole is provided in the lower wall of the case,
Even if exposed to wind and rain, rainwater, muddy water, dust, etc. do not enter the case, and the case is always kept clean.

Further, since a filter such as a net is attached to the through hole, air may come and go through the through hole, but insects, dust, etc. do not enter, and the equipment in the case is adversely affected. Does not occur.

Alternatively, in this electric valve actuator device, a plurality of through holes are formed between the inner peripheral surface of the cap and the outer peripheral surface of the spindle cover for communicating the internal atmosphere of the cylindrical spindle cover with the external air. Since the through hole serves as an air vent hole, air flows in and out of the spindle cover, the temperature difference between the inside and the outside of the spindle cover disappears, and dew condensation occurs on the wall surface of the spindle cover or inside equipment. In this case, moisture does not adhere to them, rust does not occur, the equipment does not corrode, the durability is improved, and the life is extended.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an electric valve actuator device according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the electric valve actuator device according to the present invention.

3 is a plan view showing a cap attached to the spindle cover of FIG. 2. FIG.

4 is a cross-sectional view taken along line AA of the cap attached to the spindle cover of FIG.

FIG. 5 is a schematic explanatory view showing an example of a conventional electric valve actuator system.

FIG. 6 is a schematic explanatory view showing an example of a conventional electric valve actuator device.

FIG. 7 is a sectional view showing an embodiment of a valve opening indicator in a conventional electric valve actuator device.

FIG. 8 is a side view of the valve opening indicator of FIG.

FIG. 9 is a sectional view showing an example of a spindle cover in the electric valve actuator device according to the present invention.

10 is a plan view showing a cap attached to the spindle cover of FIG. 9. FIG.

11 is a cross-sectional view of the cap attached to the spindle cover of FIG. 10, taken along line BB.

[Explanation of symbols]

 1 Housing 2 Spindle 3 Valve Opening Indicator 4 Case 5 Gear Mechanism 6 Shaft 7 Scale Plate 8 Indicator Needle 9 Transparent Plate 10, 11, 22 Through Hole 13 Spindle Cover 18 Spindle Drive Device 21 Cap 23 Lower Wall

Claims (4)

[Claims] 1. A detector comprising a scale plate and an indicator needle, and a case accommodating the detector and having a transparent plate arranged at a portion facing the scale plate for reading the indication of the indicator needle. Further, the dew condensation preventing structure in the case, wherein the lower wall of the case is formed with a through hole that communicates the internal atmosphere of the case with the outside air. 2. A spindle, which is movable in the housing in the axial direction by driving a spindle drive device and has a valve supported at its lower end, and a shaft which rotates corresponding to the axial movement amount of the spindle via a gear mechanism. A valve opening indicator equipped with a scale plate and an indicator needle attached as well, and for interpreting the indication of the indicator needle in a portion that accommodates the gear mechanism and the valve opening indicator and faces the scale plate. In the electric valve actuator device having a case in which the transparent plate is arranged, a through hole is formed in a lower wall of the case to connect the internal atmosphere of the case and the outside air. 3. The electric valve actuator device according to claim 2, wherein a filter such as a net is attached to the through hole. 4. A spindle, which is movable in an axial direction by driving a spindle drive device and has a valve supported at a lower end thereof, a cylindrical spindle cover which accommodates an upper portion of the spindle attached to the housing, and In an electric valve actuator device having a cap attached to an upper end of the spindle cover, the electric valve actuator device is formed between an inner peripheral surface of the cap and an outer peripheral surface of the spindle cover and communicates an internal atmosphere of the spindle cover with an external air. An electric valve actuator device having a through hole formed therein.