JP2008121720A - Pneumatic control valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic control valve device effectively preventing the occurrence of rusting or fouling due to the entry of rain water, dust or insects from a vent hole provided in a metal housing as part of the pneumatic control valve device. <P>SOLUTION: The pneumatic control valve device comprises a valve device 2 provided with a valve box 3, and a flow-in passage 4 and a flow-out passage 5 for fluid formed in the valve box 2, a valve rod 10 consisting of a valve element 11 arranged in the valve box in a forward/backward movable manner for opening/closing a space between the passages and a rod body 12 integrated with the valve element and protruded at the other end to the outside of the valve box, and a diaphragm unit 20 provided with a diaphragm 21 integrated with the other end of the rod body as part of the valve rod, a pressure chamber 22 made airtight inside by the diaphragm, and the housing 24 having a non-airtight chamber 23 opened to the air. Herein, the diaphragm is deformed with a change in the internal pressure of the pressure chamber to move the valve rod forward/backward. A rainwater entry preventing ventilation pipe body 30 is connected to the vent hole 26 provided in the outer wall of the housing as part of the non-airtight chamber. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement in an air-operated control valve device used for adjusting the flow rate and pressure of a fluid transferred through a pipe in various facilities such as a power plant and a factory.

  In facilities equipped with various machines and electrical equipment such as power plants and factories, liquids such as air, gas, etc., water, oil, etc. are transferred using pipes in various equipment. In order to adjust the flow rate and pressure of the fluid flowing in the tubular body, a control valve device is disposed in the middle of the tubular body.

Fig.5 (a) is an external view which shows the structure of the air operation type | formula control valve apparatus based on a prior art example, (b) is the longitudinal cross-sectional view.
This air-actuated control valve device is disposed in a valve box 101 and a valve device 100 having a fluid inflow passage 102 and an outflow passage 103 formed in the valve box 101, and is movable in and out of the valve box 101. A valve body 106 that is integrated with the valve body 107 that opens and closes between the passages, the valve body 107 and has the other end projecting outside the valve box 101, and the other end of the rod body 108 are integrated. The diaphragm 109, the pressure chamber 110 sealed inside by the diaphragm, the metal housing 112 having the non-hermetic chamber 111 opened to the atmosphere, and the non-hermetic chamber 111 are arranged to keep the diaphragm at a constant pressure. And a diaphragm unit 105 including an elastic member 113 that urges the pressure chamber 110 toward the pressure chamber 110 side. The valve rod 106 is moved up and down by the deformation of the diaphragm 109 due to the change in the internal pressure in the pressure chamber 110, so that the valve body 107 opens and closes the passages 102 and 103. The pressure chamber 110 is configured to deform the diaphragm by supplying air from a pressure adjusting means such as a compressor (not shown) and changing the internal pressure.

Since the non-hermetic chamber 111 is arranged on the upper side of the pressure chamber 110, the control valve device according to this embodiment includes a vent hole 114 for opening the non-hermetic chamber 111 to the atmosphere on the upper surface of the housing 112. . In order to prevent rainwater from entering the vent hole 114 and causing rusting and fouling in the housing, a cap 116 is put on the cylinder body 115 protruding from the vent hole 114 so as not to block the vent hole. I am doing so.
However, when this control valve device is installed outdoors exposed to rain, this level of rainwater intrusion prevention measures are not sufficient, and a large amount of rainwater is vented when exposed to storms or heavy rain. It penetrates into the housing and rusts the inner wall of the housing, or foreign substances (dirty substances, insects) enter the housing and cause it to become dirty. In particular, it has been found that rainwater splashed on the upper surface of the housing during heavy rain is likely to enter from between the cylinder 115 and the cap 116.

Further, in the type of control valve device in which the non-venting chamber 111 is disposed below the pressure chamber 110, a vent hole is simply formed as a through hole on the lower surface of the housing. However, in the event of heavy rain or storm, rainwater can easily enter the ventilation holes.
Thus, regardless of the formation position of the vent hole, rainwater that has entered from the vent hole rusts or fouls the inside of the housing, so that there is a problem that the durability of the control valve device is remarkably lowered. For this reason, it is necessary to perform maintenance frequently, and the maintenance cost is increased.

Initially, there was a suspicion that moisture in the air caused condensation in the housing as a cause of rusting on the metal part centering on the ventilation hole, and this moisture caused rusting, but in a place separated from the ventilation hole Since there was no evidence that rust was generated by moisture on a certain metal part, it can be determined that the above rust is due to rainwater that has entered through the vents.
Examples of conventional diaphragm-type air-operated control valve devices disclosed in Patent Documents 1 to 3 include rusting and fouling due to the intrusion of rainwater from the vents provided in the non-hermetic chamber, No mention is made of measures against damage caused by insect nesting and invasion.
Japanese Patent Application Laid-Open No. 08-016253 JP 09-222925 A JP 2003-241840 A

As described above, in the conventional air-operated control valve device, since rainwater and insects have not been sufficiently prevented from entering through the ventilation holes provided in the housing, rainwater and dust enter the housing. Rusting, fouling, and fouling due to insect nesting and intrusion cannot be effectively prevented, resulting in a significant decrease in the durability of the device and an increase in maintenance costs.
The present invention has been made in view of the above, and it is effective that rainwater, dust, insects, etc. enter through a vent hole provided in a metal housing constituting an air-operated control valve device to cause rusting and fouling. It is an object of the present invention to provide an air-operated control valve device that can be prevented.

In order to achieve the above-mentioned object, the invention of claim 1 is provided with a valve box, a valve device provided with an inflow passage and an outflow passage for fluid formed in the valve box, and a valve device that is movable forward and backward in the valve box. In addition to a valve body that opens and closes between the passages, a valve body that is integrated with the valve body and that has a second end projecting outside the valve box, and a rod body that constitutes the valve body A diaphragm integrated with an end; a diaphragm unit having a pressure chamber that is hermetically sealed by the diaphragm; and a non-hermetic chamber that is open to the atmosphere; and the change due to a change in internal pressure in the pressure chamber. In the air-operated control valve device for advancing and retracting the valve rod by deformation of a diaphragm, a ventilation pipe body for preventing rainwater intrusion is connected to a vent hole provided in an outer wall of the housing constituting the non-hermetic chamber. And
If the cap that covers the air vents on the outer surface of the flat housing is secured, rainwater, dust, or insects may enter the housing and cause rusting or fouling. There were many. In the present invention, it is possible to prevent intrusion of rainwater from the opening of the tip even if it is heavy rain or storm, by attaching a vent pipe having an opening at a position extending from the vent hole and preventing rainwater from entering.

According to a second aspect of the present invention, in the first aspect, the tip opening of the vent tube opens at a position not facing the outer wall of the housing.
This is because rainwater bounced off the outer surface of the housing often enters from the opening at the front end.
According to a third aspect of the present invention, in the first or second aspect, the vent pipe body includes a funnel portion that expands in a tapered shape at a distal end portion.
Intrusion of rainwater can be more easily prevented by expanding the tip in a tapered shape.
According to a fourth aspect of the present invention, in the first, second, or third aspect, a filter for preventing foreign matter contamination is provided at a distal end opening of the vent pipe body.
In order to prevent the invasion of insects and dust, a filter for physically preventing the invasion is necessary.

According to a fifth aspect of the present invention, in the first, second, third, or fourth aspect, a gutter that prevents intrusion of rainwater is provided on the inner wall of the vent pipe body.
Rainwater that has entered can be trapped at the buttock by providing a hoe.
According to a sixth aspect of the present invention, in the first, second, third, fourth, or fifth aspect, when the non-hermetic chamber is located below the pressure chamber, the vent tube is provided on the upper surface of the non-hermetic chamber. A base end portion extending upward from the vent hole, an intermediate portion extending from the base end inclined in a horizontal or downward direction, and a front end portion bent downward from the intermediate portion.
Even if the shape of the vent pipe body is not so complicated, the effect of preventing rainwater intrusion can be sufficiently exhibited by making it an inverted U shape.

According to a seventh aspect of the present invention, in the first, second, third, fourth, or fifth aspect, when the non-hermetic chamber is located above the pressure chamber, the vent tube is provided on a lower surface of the non-hermetic chamber. A base end portion extending downward from the vent hole, an intermediate portion extending from the base end inclined in a horizontal or downward direction, and a distal end portion bent downward from the intermediate portion.
Even if the shape of the vent pipe body is not so complicated, the effect of preventing rainwater intrusion can be sufficiently exhibited by making it into a crank shape or a substantially L shape.
According to an eighth aspect of the present invention, in the first aspect, a bag body that expands and contracts is attached to a distal end portion of the vent pipe body to block communication between the non-hermetic chamber and the atmosphere.
By connecting the non-hermetic chamber to a bag having a sufficient capacity to communicate with the atmosphere, it is possible to absorb and mitigate changes in the atmospheric pressure of the non-hermetic chamber due to the deformation of the diaphragm.

  As described above, according to the present invention, the ventilation tube for preventing rainwater infiltration is connected to the ventilation hole provided in the outer wall of the housing constituting the non-hermetic chamber of the air-operated control valve device. It is possible to effectively prevent rainwater, dust, insects and the like from entering and causing rusting and fouling.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
1A and 1B are an external configuration diagram and an internal configuration diagram of an air-operated control valve device according to one embodiment of the present invention.
This air-operated control valve device 1 (hereinafter referred to as control valve device 1) includes a valve device 2, a valve rod 10, a diaphragm unit 20, and a vent pipe body 30.
The valve device 2 includes a valve box 3 and a fluid inflow passage 4 and an outflow passage 5 formed in the valve box 3.
The valve stem 10 is disposed in the valve box 3 so as to be movable back and forth, and opens and closes between the passages 4 and 5. The valve body 10 is integrated with the valve body 11 and extends upward. And a protruding rod 12.

The diaphragm unit 20 has a diaphragm 21 made of an elastic material integrated with the other end of the rod 12, a pressure chamber 22 hermetically sealed by the diaphragm 21, and a non-hermetic chamber 23 opened to the atmosphere. A metal housing 24 and an elastic member 25 disposed in the non-hermetic chamber 23 and biasing the diaphragm 21 toward the pressure chamber 22 with a constant pressure are provided. In other words, the diaphragm 21 is disposed across the housing so as to partition the inside of the housing 24 into upper and lower chambers 22 and 23.
The valve body 11 is moved up and down by the elastic deformation of the diaphragm 21 due to the change in the internal pressure in the pressure chamber 22 to open and close the communication flow path between the passages 4 and 5 by the valve body 11. Has been. The pressure chamber 22 is configured to deform the diaphragm by supplying air from a pressure adjusting means such as a compressor (not shown) disposed outside and changing the internal pressure.

Since the non-hermetic chamber 23 is arranged above the pressure chamber 22 in the control valve device 1 according to this embodiment, the upper surface of the housing 24 includes a vent hole 26 for opening the non-hermetic chamber 23 to the atmosphere. Yes. In order to prevent rainwater from entering the vent hole 26 and rusting and fouling the inside of the housing, the vent pipe body 30 for preventing rainwater intrusion is connected to the vent hole 26 in the present invention.
The vent tube 30 protrudes upward from the vent hole 26 and then extends in the lateral direction, thereby extending the distance from the tip opening to the vent hole 26 so that rainwater entering from the tip opening does not reach the vent hole. To work.
In particular, if the front end opening of the vent tube 30 faces the upper surface of the housing or other outer surface of the housing, rainwater bounced off the outer surface of the housing is likely to enter, so the outer surface of the housing and the front end opening of the vent tube are facing each other. It is preferable to arrange so that it does not.

When the vent hole 26 is formed on the upper surface of the housing 24, the vent tube body 30 protrudes upward from the base end portion 30a directly connected to the vent hole 26 and then from the upper end of the base end portion 30a. The intermediate portion 30b is extended in the horizontal direction (or obliquely downward), and the tip portion 30c is bent (including curved) further downward from the intermediate portion 30b. From the upper surface of the housing, the opening portion of the tip portion 30c is directed downward and is located outside the outer peripheral edge of the upper surface of the housing (by disposing the tip portion opening portion and the housing upper surface so as not to face each other). Rain water that has bounced back can be prevented from entering the opening.
The vent tube body 30 of the present invention has a tip opening portion facing downward, and the intermediate portion 30b is long and horizontally or inclined downward toward the outer diameter direction. It becomes difficult for rainwater entering from the opening to reach the vent hole 26 through a long path.

Furthermore, by making the tip portion 30c a tapered funnel portion, it is difficult for rainwater flowing down along the outer surface of the tip portion to enter the inside from the tip opening. Note that the tip does not necessarily have to be expanded in a funnel shape.
The formation position of the vent hole 26 does not need to be at the center of the upper surface of the housing as shown in the figure. When the vent hole 26 is formed near the edge of the upper surface of the housing, the vent tube body 30 extends from there to the outer diameter direction. Can be shortened.

Maintenance can be facilitated by adopting a detachable configuration by screwing, press-fitting, or the like at the connection portion between the base end portion of the vent tube body 30 and the vent hole 26.
The vent tube 30 may be a metal tube or a resin material that is resistant to rust and has sufficient strength. Therefore, for example, a simple water discharge hose may be fixed to the vent hole by bonding or the like.
Since the vent pipe body 30 of the present invention can be retrofitted to an existing control valve device 1 having a vent hole, there is no need to redesign the housing structure, and a waterproof structure is constructed at low cost. be able to.

Next, FIG. 2 is a cross-sectional view showing another configuration example of the distal end portion of the vent pipe body, and a filter 35 for preventing foreign matter contamination is disposed in the distal end opening portion of the tapered distal end portion 30c. The filter 35 has a function of preventing foreign matter such as dust and insects from entering and nesting while allowing the air to flow in and out.
Further, by forming the flange 36 inclined toward the outer direction (the direction of the tip opening) on the inner wall of the vent pipe body 30, it is possible to prevent rainwater that has entered the pipe body from proceeding to the inside. it can.

Next, FIGS. 3A and 3B are an external view and a longitudinal sectional view showing a configuration example in which the ventilation tube body is attached to the bottom of the housing, and the non-hermetic chamber 23 is disposed below the pressure chamber 22. If it is, the vent tube 30 is protruded in the outer diameter direction from the vent hole provided in the bottom of the housing.
That is, the vent tube 30 according to this embodiment includes a base end portion 30a extending downward from a vent hole 26 provided in the lower surface of the non-hermetic chamber, and an intermediate portion 30b extending obliquely downward or horizontally from the base end portion 30a. And a tip portion 30c bent downward from the intermediate portion 30b.
The vent tube 30 according to this embodiment has the tip opening portion facing downward, and the intermediate portion 30b is long and horizontal, or is inclined downward toward the outer diameter direction. It becomes difficult for rainwater entering from the opening of the tip to reach the vent hole 26 through a long path.
In addition, the point which makes the front-end | tip part 30c shown in FIG. 1 into the funnel part expanded in the taper shape, the point which provides the foreign material mixing prevention filter shown in FIG. 2, the point which provides the rainwater infiltration prevention point, etc. The present embodiment can also be used.

Next, FIG. 4 (a) and (b) are principal part block diagrams of the regulating valve apparatus which concerns on other embodiment of this invention.
The control valve device 1 according to FIGS. 4 (a) and 4 (b) is characterized by a structure in which the bag body 40 is attached to the tip opening portion without allowing the tip opening portion of the ventilation tube body 30 to communicate with the atmosphere.
The bag body 40 in FIG. 4A is a balloon-shaped bag body made of rubber, resin, etc., and allows the diaphragm 21 to be deformed by expanding and contracting as the internal pressure changes in the pressure chamber. Since the bag body 40 shields the inside of the vent pipe body from the outside air, it can prevent the intrusion of rainwater and the entry of dust and insects.
The bag body 40 in FIG. 4B is a bellows-like bag body and smoothly deforms the diaphragm 21 while performing a waterproof function in the same manner as the bag body in FIG.
The resistance when the bag body 40 expands and contracts is configured to be as small as possible.
As described above, according to the embodiment of FIG. 4, the vent tube end opening is closed by the bag, so that the vent tube can be shortened and miniaturized.

  As described above, according to the present invention, the ventilation pipe body 30 for preventing rainwater infiltration is connected to the ventilation hole 26 provided in the outer wall of the housing constituting the non-hermetic chamber 23 of the air-operated control valve device 1. In addition, it is possible to effectively prevent rainwater, dust, insects and the like from entering through the vent holes to cause rusting and fouling.

(A) And (b) is the external appearance block diagram of the air-actuated type control valve apparatus which concerns on one actual form of this invention, and an internal block diagram. It is sectional drawing which shows the other structural example of the front-end | tip part of a ventilation pipe body. (A) And (b) is the external view and longitudinal cross-sectional view which show the structural example which attached the ventilation pipe body to the bottom part of the housing. (A) And (b) is a principal part block diagram of the control valve apparatus which concerns on other embodiment of this invention. (A) is an external view which shows the structure of the air-operated type control valve apparatus based on a prior art example, (b) is the longitudinal cross-sectional view.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Air-actuated type control valve apparatus, 2 ... Valve apparatus, 3 ... Valve box, 4 ... Inflow passage, 5 ... Outflow passage, 10 ... Valve rod, 11 ... Valve body, 12 ... Rod body, 20 ... Diaphragm unit, 21 ... Diaphragm, 22 ... Pressure chamber, 23 ... Non-hermetic chamber, 24 ... Housing, 25 ... Elastic member, 26 ... Vent, 30 ... Vent tube, 30a ... Base end, 30b ... Intermediate, 30c ... Tip, 35 ... filter, 36 ... buttocks, 40 ... bag.

Claims (8)

A valve device comprising: a valve box; and an inflow passage and an outflow passage for fluid formed in the valve box;
A valve body that is arranged in the valve box so as to be movable forward and backward, and that opens and closes between the passages; and a valve body that is integrated with the valve body and has a rod body that projects the other end to the outside of the valve box;
A diaphragm unit comprising a diaphragm integrated with the other end of the rod constituting the valve rod, and a housing having a pressure chamber hermetically sealed by the diaphragm and a non-hermetic chamber opened to the atmosphere. When,
In an air-operated control valve device for moving the valve rod forward and backward by deformation of the diaphragm due to a change in internal pressure in the pressure chamber,
An air-operated control valve device, wherein a ventilation pipe body for preventing rainwater intrusion is connected to a vent hole provided in an outer wall of the housing constituting the non-hermetic chamber.   2. The air-operated control valve device according to claim 1, wherein a front end opening of the vent tube opens at a position not facing the outer wall of the housing.   The air-operated control valve device according to claim 1 or 2, wherein the vent pipe body includes a funnel portion that expands in a tapered shape at a distal end portion.   The air-operated control valve device according to claim 1, 2 or 3, wherein a filter for preventing foreign matter mixing is provided at a distal end opening of the ventilation tube.   The air-operated control valve device according to claim 1, 2, 3, or 4, wherein a hook for preventing intrusion of rainwater is provided on the inner wall of the vent pipe body.   When the non-hermetic chamber is located below the pressure chamber, the vent pipe body has a base end portion extending upward from the vent hole provided on the upper surface of the non-air tight chamber and a horizontal end from the base end portion, or The air-operated control valve device according to claim 1, 2, 3, 4, or 5, further comprising: an intermediate portion extending downward and inclined; and a tip portion bent downward from the intermediate portion.   When the non-hermetic chamber is located above the pressure chamber, the vent pipe body includes a base end portion that extends downward from the vent hole provided in the lower surface of the non-air tight chamber, and a horizontal end from the base end portion, or The air-operated control valve device according to claim 1, 2, 3, 4, or 5, further comprising: an intermediate portion extending downward and inclined; and a tip portion bent downward from the intermediate portion.   The air-operated control valve device according to claim 1, wherein a bag body that expands and contracts is attached to a distal end portion of the vent pipe body to block communication between the non-hermetic chamber and the atmosphere.

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