JP2011117519A - Valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve washing performance by preventing easy stagnation of paint in a valve chamber, sending in washing fluid from an inlet during washing, and cleanly washing a valve chamber interior in a short time, and as a result, to prevent painting defects such as generation of seeds. <P>SOLUTION: In the valve device, an outlet (4out) including a valve seat (3) is formed in a bottom side of the valve chamber (2), a sealing diaphragm (D) attached to a top side of the valve chamber (2) is fixed to a valve element (5) of a top guide shape piercing the sealing diaphragm (D), and a passage from the inlet (4in) formed in the valve chamber (2), through the valve chamber (2) interior, and to the outlet (4out) is opened and closed by reciprocating the valve element (5) with respect to the valve seat (3). The valve chamber (2) is formed into a truncated cone shape reduced in diameter from the top side toward the bottom side, and the inlet (4in) is opened in a tangential direction with respect to a truncated cone shape inner peripheral surface (2a). <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a valve device that controls supply / stop of a liquid, and is particularly suitable for a color change valve that selectively selects and supplies each color paint supplied from a paint supply source.

As shown in FIG. 7, in the color change coating, an arbitrary color paint is selectively selected from among a plurality of colors of paint supplied by the color change device CV, and the color paint is supplied to the coating machine T and applied. I am doing so.
Color change device CV is a manifold block M which paint passage f is formed, the color valves V connected individually to each color paint supply source P ₁ to P _4, the cleaning liquid valves V connected to a cleaning liquid supply source S _{C C,} connected cleaned air valve V _a is attached to a compressed air source S _a.

8A to 8C are a longitudinal sectional view at the time of closing, a longitudinal sectional view at the time of opening, and a transverse sectional view of the valve device 51 used as such a color valve V. FIG.
In this type of valve device 51, if the sliding hole 54 of the valve body 53 is opened in the valve chamber 52, there is a possibility that the paint may penetrate into the gap and harden to cause a malfunction of the valve. Therefore, there has conventionally been proposed a structure in which the valve chamber 52 is partitioned by the sealing diaphragm D so that the sliding hole 54 is not opened in the valve chamber 52 (see Patent Document 1).

  Specifically, an outflow port 56out having a valve seat 55 is formed on the bottom side of the valve chamber 52, and a sealing guide D mounted on the top side of the valve chamber 52 passes through the diaphragm D. A flow path that is fixed to the body 53 and moves from the inlet 56in opened on the side surface of the valve chamber 52 to the outlet 56out through the valve chamber 52 by moving the valve body 53 forward and backward with respect to the valve seat 55. It opens and closes.

  The valve body 53 is formed in a straight line by screwing the top rod 59 connected to the piston 58 of the cylinder 57 and the bottom rod 60 disposed in the valve chamber 52, and the diaphragm D is sandwiched therebetween. The top rod 60 is supported so as to be slid along the sliding hole 54.

As shown in FIG. 9, the valve chamber 52 has an inner peripheral surface 52a formed of a cylindrical surface, and a diaphragm mounting hole 62 having a diameter larger than that of the valve chamber 52 and substantially equal to the outer diameter of the diaphragm D is formed on the top side. Has been.
An internal thread is formed on the inner peripheral surface of the mounting hole 62, and the outer peripheral surface of the valve body 53 is inserted into the valve chamber 52 and the diaphragm D is placed on the bottom stepped portion 63 of the mounting hole 62. The outer peripheral edge of the diaphragm D is fixed so as to be clamped by screwing a fixing plug 64 having a male screw formed thereon.
As a result, the top side of the valve chamber 52 is partitioned, and the sliding hole 54 through which the valve body 53 slides is not opened in the valve chamber 52 and the paint does not adhere to the top rod 60. There is no problem with the valve.

By the way, such a color valve V is designed to be cleaned by alternately flowing cleaning liquid / cleaning air from the inflow port 56in at the time of maintenance performed once a week, for example. The interior of the valve chamber 52 cannot be cleaned cleanly in a short time, and the paint that has not been washed out adheres and cures in the valve chamber 52, and the cured paint is peeled off and sprayed from the coating machine T. May occur.
In order to eliminate such a problem, it is necessary to supply the cleaning fluid sufficiently for a long period of time, so that not only a large amount of cleaning liquid is required, but also the trouble of processing the waste liquid is caused.

When the present inventors made an experiment by creating a transparent model, since the valve body 53 is located in front of the inflow port 56in, the cleaning fluid such as the cleaning liquid hits the valve body 53 and the flow force is deflected. In addition, the back side of the valve body 53 is poorly cleaned because it is divided into left and right.
Further, since the cleaning liquid flowing in from the inflow port 56in flows toward the bottom-side outflow port 56out, the cleaning property of the paint adhering to the diaphragm D positioned on the top side is poor.

Furthermore, the inner peripheral surface 52a of the valve chamber 52 is formed in a cylindrical shape whose inner diameter is equal to the effective diameter of the movable portion of the diaphragm D, and the difference in the diameter from the inner diameter of the outlet 56out where the valve seat 55 is formed is large. Since the width of the tapered surface 52b toward the valve seat 55 on the bottom side is wide, it has been found that the paint stagnates on the tapered surface 52b and the corners 52c of the valve chamber peripheral surface 52a and is easily adhered and cured.
For this reason, since a large amount of cleaning liquid and time are required for cleaning, and the waste liquid treatment must be performed, conventionally, the cleaning efficiency is extremely low, and improvement in cleaning performance has been desired.

Japanese Patent Laid-Open No. 11-22835

  Therefore, the present invention improves the cleaning performance so that the valve chamber can be cleaned cleanly in a short time by flowing a cleaning fluid from the inlet at the time of cleaning. The technical challenge is to prevent defects before they occur.

  In order to solve this problem, the present invention is a top guide type in which an outlet having a valve seat is formed on the bottom side of a valve chamber, and a sealing diaphragm mounted on the top side of the valve chamber penetrates the diaphragm. In the valve device which is fixed to the valve body and opens and closes the flow path from the inlet formed in the valve chamber to the outlet through the valve chamber by moving the valve body forward and backward. The chamber is formed in a frustoconical shape whose diameter decreases from the top side toward the bottom side, and the inflow port is formed to open in a tangential direction to the inner peripheral surface of the frustoconical shape. It is said.

  According to the present invention, the valve chamber is not cylindrical, but is formed in a truncated conical shape whose diameter is reduced from the top side toward the bottom side, so there is almost no difference in diameter between the conical diameter-reduced portion and the valve seat hole, Therefore, when the paint is poured into the valve chamber, the paint is unlikely to collect at the corners between the inner circumferential surface of the cone and the tapered surface.

In addition, since the inflow port is opened in the tangential direction of the inner peripheral surface of the cone, when the cleaning fluid flows into the valve chamber from the inflow port, the cleaning fluid flows along the inner peripheral surface of the cone without losing its momentum. Therefore, the paint adhering to the inner peripheral surface can be washed cleanly.
At this time, since the conical valve chamber has a wide space on the top side and a narrow side on the bottom side, the cleaning fluid first flows toward the top side, and after washing away the paint adhering to the diaphragm, It flows toward the bottom side with the swirling flow around the valve and flows out from the valve seat hole.
Therefore, even if the paint adhering to the inner peripheral surface of the valve chamber and the outer peripheral surface of the valve body is cleaned cleanly and the paint accumulates at the corners described above, the cleaning fluid heading toward the valve seat hole while turning makes it easy. As a result, the cleaning performance is improved.

Sectional drawing which shows an example of the valve apparatus which concerns on this invention. The exploded view and assembly drawing which show the valve body of the conventional apparatus. The disassembled perspective view which shows the principal part. Explanatory drawing which shows the state with which the manifold was mounted | worn. Explanatory drawing which shows another Example. Explanatory drawing which shows another Example. Explanatory drawing which shows the example of a coating material supply system. Sectional drawing which shows a conventional apparatus. The disassembled perspective view which shows the principal part of the conventional apparatus.

  In this example, the paint is difficult to stagnate in the valve chamber, and when cleaning, a cleaning fluid such as a cleaning liquid is allowed to flow from the inlet, so that the valve chamber can be cleaned cleanly in a short period of time, thereby improving cleanability and eventually generating fouling. In order to achieve the purpose of preventing coating defects such as, an outlet with a valve seat is formed on the bottom side of the valve chamber, and a sealing diaphragm attached to the top side of the valve chamber penetrates the diaphragm A valve that is fixed to the top guide type valve body and that opens and closes the flow path from the inlet formed in the valve chamber to the outlet through the valve chamber by moving the valve body forward and backward. In the apparatus, the valve chamber is formed in a truncated cone shape whose diameter is reduced from the top side toward the bottom side, and the inlet is formed in a tangential direction with respect to the inner circumferential surface of the valve chamber in the truncated cone shape. did

1A to 1C are a longitudinal sectional view at the time of closing, a longitudinal sectional view at the time of opening, and a sectional view taken along line II of the valve device 1 according to the present invention.
The valve device 1 of this example is used in, for example, a paint color changing device CV (see FIGS. 4 and 7) mounted on a manifold block M, and includes a valve seat 3 on the bottom side of the valve chamber 2. An outlet 4out is formed, and a sealing diaphragm D mounted on the top side of the valve chamber 2 is fixed to a top guide type valve body 5 that penetrates the diaphragm D, and the valve body 5 is integrated with the top side. The air cylinder 6 formed in the valve chamber 3 is arranged so as to be able to advance and retreat with respect to the valve seat 3, so that the flow path from the inlet 4 in formed in the valve chamber 2 through the valve chamber 2 to the outlet 4 out can be opened and closed. It has become.

A bottom rod 5B disposed in the valve chamber 2 is linearly screwed to the top rod 5T connected to the piston 8 of the cylinder 6 and the diaphragm D is sandwiched therebetween. The top rod 5T is supported so as to be slid along the sliding hole 9 (see FIG. 2).
The bottom rod 5B has a male screw portion 5b that engages with a female screw hole 5a formed at the tip of the top rod 5T at its upper end, and a substantially conical tip 5c that contacts the valve seat 3 at the tip. And a parallel two-surface width cut portion 5d that engages a screw tightening tool such as a spanner is formed at the intermediate portion.
Then, the male screw portion 5b is inserted into the mounting center hole 10 of the disc-shaped sealing diaphragm D, and is screwed into the female screw hole 5a formed at the upper end of the top rod 5T to sandwich the diaphragm D. It is fixed.

The valve chamber 2 is formed in a frustoconical shape with a diameter decreasing from the top side toward the bottom side, and a diaphragm mounting hole 11 having a diameter larger than that of the valve chamber 2 and substantially equal to the outer diameter of the diaphragm D is formed on the top side. (See FIG. 3).
An internal thread is formed on the inner peripheral surface of the mounting hole 11, and the outer peripheral surface of the valve body 5 is inserted into the valve chamber 2 and the diaphragm D is placed on the bottom step 12 of the mounting hole 11. The fixing plug 13 having a male screw formed thereon is screwed to fix the outer peripheral edge of the diaphragm D so as to be sandwiched.
Thereby, since the top side of the valve chamber 2 is partitioned by the diaphragm D, the paint soaks into the sliding hole 9 of the valve body 5 or the paint adheres to the top rod 5T sliding through the sliding hole 9. There is no.

As shown in FIG. 1B, the inflow port 4in is opened at a height where the parallel two-surface width cut portion 5d is located when the valve body 5 is opened, and in FIG. 1C. As shown, an opening is formed in the circumferential tangent direction with respect to the frustoconical inner peripheral surface 2a.
A cylindrical portion 2c extending downward from a conical diameter-reduced portion 2b located on the bottom side of the frustoconical inner peripheral surface 2a formed in the valve chamber 2 is continuously formed, and further, the lower end thereof is connected to the valve seat 3 The diameter of the outlet 4out is reduced and the outlet 4out is opened from the valve seat 3 to the outside.

  The air cylinder 6 urges the valve body 5 attached to the piston 8 in the closing direction by the elastic force of the spring 14, and when compressed air is supplied from the air inlet / outlet 6a, the air cylinder 6 The piston 8 is moved by a predetermined stroke against the impulsive force so that the valve body 5 is opened.

The above is an example of the configuration of the present invention. Next, the operation of the valve device 1 will be described by taking as an example the case where the valve device 1 is used as the color valve V of the paint color changing device CV shown in FIG.
An outlet 4out of each color valve V (valve device 1), as shown in FIG. 4, and communicates with the connection hole h of the manifold block M is mounted, an inlet 4in to each color paint supply source P ₁ to P ₄ Connecting.
In this state, as shown in FIG. 1 (b), when compressed air for driving the valve is supplied to the air cylinder 6 of an arbitrary color valve V, the valve body 5 is retracted to open the outlet 4out. Color paint is supplied to the coating machine T.

At this time, the paint becomes a swirling flow that flows along the frustoconical inner peripheral surface 2a of the valve chamber 2 from the inlet 4in, flows into the valve chamber 2, and flows out from the outlet 4out as the swirling flow. .
In addition, since the valve chamber 2 is formed in a truncated conical shape whose diameter decreases from the top side toward the bottom side, there is almost no difference in the diameter between the conical diameter-reduced portion 2b on the bottom side and the outlet 4out. Even if the corner portion 2 d is formed on the inner peripheral surface of the valve chamber 2, it is difficult for the paint to accumulate.

  Next, when cleaning individual color valves V during maintenance, etc., the cleaning fluid / cleaning air is alternately and vigorously supplied as the cleaning fluid from the inlet 4in with the valve body 5 retracted and the outlet 4out opened. Then, since the cleaning fluid becomes a swirl flow that flows along the frustoconical inner peripheral surface 2a of the valve chamber 2, the paint adhering to the inner peripheral surface 2a can be cleaned cleanly.

At this time, since the conical valve chamber 2 has a wide space on the top side and a narrow side on the bottom side, the cleaning fluid flowing into the valve chamber 2 first flows toward the top side, and the paint adhering to the diaphragm D is removed. After washing away, the swirl flows around the valve body 5 and flows toward the bottom, and flows out from the outlet 4out.
Therefore, even if the paint adhering to the inner peripheral surface 2a of the valve chamber 2 and the outer peripheral surface of the valve body 5 is washed cleanly and the paint may accumulate in the corner 2d of the valve chamber 2, the outlet 4out is turned while turning. It is easily cleaned by the cleaning fluid toward

  Further, in the valve chamber 2, the cleaning fluid that vigorously flows from the inlet 4 in and moves up to the diaphragm D side in the vicinity of the height of the inlet 4 in and swirls from the top side to the bottom side of the valve chamber 2. However, the cleaning fluid that descends mixes and the flow is disturbed, and the parallel two-surface width cut portion 5d of the valve body 5 that is opened at the same height is positioned. It can be washed away.

Note that the inlet 4in of the valve device 1 described above may be formed so as to be inclined upward in the tangential direction of the inner peripheral surface 2a of the valve chamber 2 as shown in FIG.
If the inflow port 4in is formed in such a direction, the cleaning fluid flows upward toward the diaphragm D while swirling, so that the paint adhering to the diaphragm D can be more reliably cleaned and removed.
The truncated conical valve chamber 2 is formed with a diameter equal to the effective diameter of the movable portion of the diaphragm D on the top side, and is reduced in diameter toward the outlet 4out on the bottom side. The shape is not limited to a truncated cone shape, but may be a substantially truncated cone shape.
For example, a cylindrical inner peripheral surface 2e is formed between the truncated conical inner peripheral surface 2a formed in the valve chamber 2 and the diaphragm D (see FIG. 5 (b)), or a truncated conical shape. A frustoconical surface (not shown) having a different inclination angle that decreases in diameter from the top side to the bottom side is formed between the inner peripheral surface 2a and the diaphragm D. The ridgeline of the inner peripheral surface 2a may be formed in a substantially frustoconical shape (not shown) formed by curving convexly or concavely toward the inside of the valve chamber 2.

FIG. 6 shows another embodiment, and the same parts as those in FIGS.
The valve device 21 of this example includes a valve drive mechanism 22 having a valve body 5, a cylinder 6, and a sealing diaphragm D, and a manifold block 24 in which a mounting hole 23 for mounting the valve driving mechanism 22 is formed. On the side, an outlet 4out communicating with the paint flow path f of the manifold block 24 is formed, and a valve seat 3 is formed at the outlet 4out.

Further, when the valve drive mechanism 22 is mounted in the mounting hole 23, a valve chamber space serving as a truncated conical valve chamber 2 having a diameter reduced from the top side to the bottom side between the diaphragm D and the outlet 4out. 25, and the inlet 4in is formed in the valve chamber space 25.
As in the embodiment shown in FIG. 1B, the inflow port 4in has the parallel two-surface width cut portion 5d positioned when the valve body 5 is opened with the valve drive mechanism 22 mounted in the mounting hole 23. It is opened at a height and is formed in the tangential direction with respect to the frustoconical inner peripheral surface 2a.
Also in this example, as a matter of course, the inlet 4in may be formed to be inclined upward as shown in FIG. 5 (a).

  Further, a plurality of mounting holes 23 are formed in the manifold block 24, and the outlet 4out of each mounting hole 23 communicates with the paint flow path f of the manifold block 24. The color changing device CV is configured by mounting the mechanism 22.

Also in this example, since the valve chamber 2 is formed in a truncated cone shape whose diameter is reduced from the top side toward the bottom side, when the cleaning fluid is vigorously supplied from the inlet 4in with the valve V opened, The cleaning fluid that has flowed into the chamber 2 flows toward the top side of the inner peripheral surface 2fv first, and after washing away the paint adhering to the diaphragm D, it flows toward the bottom side while swirling around the valve body 5, It flows out from the outlet 4out.
Therefore, even if the paint adhering to the inner peripheral surface 2a of the valve chamber 2 and the outer peripheral surface of the valve body 5 is washed cleanly and the paint may accumulate in the corner 2d of the valve chamber 2, the outlet 4out is turned while turning. The cleaning fluid is easily cleaned by the cleaning fluid heading toward the surface, and the cleaning performance is greatly improved.

  Furthermore, in this example, since each inflow port 4in and the air inflow / outflow port 6a communicate with the ports 28 and 29 formed in the manifold block 24 via the flow paths 26 and 27, piping to the respective ports 28 and 29 is performed. This not only simplifies the connection work of the type, but also has an advantage that the valve drive mechanism 22 can be removed while the piping is connected to perform internal inspection.

  The present invention can be applied to paints and other valve devices that require frequent cleaning of the valve chamber.

1 Valve device M Manifold block h Connection hole 2 Valve chamber 2a Inner peripheral surface 3 Valve seat 4in Inlet 4out Valve seat hole 5 Valve body D Diaphragm

Claims (6)

An outlet having a valve seat is formed on the bottom side of the valve chamber, a sealing diaphragm mounted on the top side of the valve chamber is fixed to a top guide type valve body penetrating the diaphragm, and the valve body is In the valve device that opens and closes the flow path from the inlet formed in the valve chamber through the valve chamber to the outlet by moving the valve seat forward and backward,
The valve chamber is formed in a truncated cone shape whose diameter is reduced from the top side toward the bottom side, and the inflow opening is formed in a tangential direction with respect to the inner circumferential surface of the truncated cone shape. A valve device characterized by.   The valve device according to claim 1, wherein the inlet is formed to be inclined toward the top side.   3. The valve device according to claim 1, wherein a cylindrical inner peripheral surface that is continuous with the conical inner peripheral surface is formed between the diaphragm and the truncated conical inner peripheral surface.   The valve device according to any one of claims 1 to 3, comprising a valve drive mechanism including at least the valve body and a sealing diaphragm, and a manifold block having a mounting hole for mounting the valve driving mechanism.   A valve chamber space that becomes the valve chamber when the valve drive mechanism is mounted is formed in the mounting hole of the manifold block, and the inlet and the outlet are formed in the valve chamber space. Item 5. The valve device according to Item 4. The valve device according to claim 4 or 5, wherein a plurality of valve mounting holes are formed in the manifold block.

Images