JPH11230407A - Flow control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow control valve capable of preventing foreign matters smaller than a clearance between a valve seat and a needle valve from clogging the clearance so as to secure proper operation. SOLUTION: A vibrating body 10 is provided in a passage 19 of fluid R to vibrate the fluid R by vibrating the vibrating body 10. The vibration is transferred in the fluid R to vibrate the fluid R in a valve hole 18 between the needle valve 11 and the valve seat 12. By vibrating the fluid R in the valve hole 18, fine clusters of foreign matters clogged in the valve hole 18 are vibrated to break into pieces. The broken pieces of the fine foreign matters are drained with the fluid R.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control valve for adjusting the amount of fluid flowing through a valve hole by moving a needle valve with respect to a valve seat. And a flow control valve adapted to remove foreign matter during the flow.

[0002]

2. Description of the Related Art There is a flow rate control valve for adjusting a flow rate and flowing a fluid, which has a needle valve. This flow control valve changes the size of the gap (valve hole) between the valve seat and the valve body by moving the generally conical needle valve with respect to the circular valve seat. Adjusting fluid flow rate. In general, the gap between the valve seat and the valve body is narrow and slightly changed. Therefore, sand,
If foreign matter such as dust or rust on the piping is mixed,
They can become clogged in the gap between the valve seat and the valve body.
The clogging of these foreign substances causes an unexpected change in the flow rate, and also impairs the movement of the needle valve. In the worst case, the needle valve may not be completely closed due to foreign matter.

Conventionally, in the above-mentioned flow control valve, in order to avoid the clogging of foreign matter as described above, a filter is installed upstream of the valve so that the foreign matter is removed from the fluid in advance and then flowed. I was Generally, the size of the mesh of the filter is approximately the same as the gap between the valve seat and the valve element. Therefore, foreign matter having a size that can be clogged in the gap is removed by the filter.

[0004]

However, even a fine foreign matter that passes through the filter may happen to stay in the gap between the valve seat and the valve body. When other fine foreign matter flows there, the fine foreign matter sticks to each other to form a somewhat large lump. Then, even a minute foreign matter may be clogged in the gap between the valve seat and the valve body. Alternatively, when a large number of fine foreign substances flow at the same time, they may be pressed into each other and pushed into the gap, and a plurality of foreign substances may be combined in a cross-linked manner.
In such a case, fine foreign matter that flows further later accumulates in the bridge-like portion, and there is a possibility that the foreign matter forms a lump and clogs the gap between the valve seat and the valve body.

[0005] In order to remove the above-mentioned fine foreign matter, a filter having a finer size can be used. But,
The use of a filter with fine eyes may cause clogging immediately, and also causes a problem that the flow of the fluid itself is deteriorated. Alternatively, when there is a change in the flow rate of the fluid, that is, when the foreign matter stays, the bridge of the foreign matter may be broken by hitting the vicinity of the valve by the user, and the circulation may be smooth. However, this method requires the user to always observe the flow rate, which is extremely complicated.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent a foreign substance smaller than the clearance from clogging a clearance between a valve seat and a needle valve and to ensure proper operation. It is to provide a flow control valve which can be used.

[0007]

In order to achieve the above object, according to the present invention, the amount of fluid flowing through a valve hole is adjusted by moving a needle valve with respect to a valve seat. In the flow control valve configured as described above, a fluid vibration unit for vibrating the fluid is provided.

[0008] According to the above configuration, by operating the fluid oscillating means to oscillate the fluid, fine foreign matters accumulated in the valve hole between the needle valve and the valve seat are shaken away.

In order to achieve the above object, a second aspect of the present invention is the vibrating body according to the first aspect of the present invention, wherein the fluid vibrating means is provided in a flow path upstream of the valve hole. It is intended.

According to the above configuration, by operating the vibrator, vibration is applied to the fluid in the flow path upstream of the valve hole, and the vibration collects in the valve hole between the needle valve and the valve seat. Transmitted to the fine foreign matter, and the foreign matter is shaken away.

According to a third aspect of the present invention, in order to achieve the above object, in the configuration of the first aspect, the fluid oscillating means is provided in any one of the valve body and the casing including the valve seat. The purpose is to be a vibrating body.

According to the above arrangement, by operating the vibrator, vibration is applied to the fluid through the casing including the valve element or the valve seat, and the vibration is applied to the valve hole between the needle valve and the valve seat. Is transmitted to the minute foreign matter that has accumulated on the surface, and the foreign matter is shaken away.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] Hereinafter, a first embodiment of a "flow control valve" according to the present invention will be described in detail with reference to the drawings. The configuration of the flow control valve according to the first embodiment will be described with reference to FIGS. FIG.
FIG. 2 is a sectional view showing a schematic configuration of a flow control valve 1 according to the present embodiment, and FIG. 2 is a partially enlarged view of FIG.

As shown in FIG. 1, the flow control valve 1 includes a needle valve 11, a valve seat 12, and a casing 13.
2 is a part of the casing 13. Further, the casing 13 is provided with the vibrating body 10 as the fluid vibration means of the present invention. The needle valve 11 and the valve seat 12 are general, and the needle valve 11 is provided integrally with a valve rod 14, and the valve rod 14 is movable in the vertical direction in FIG. The movement of the valve stem 14 causes the needle valve 11 to move.
Moves, comes into contact with or separates from the valve seat 12, and the distance between the needle valve 11 and the valve seat 12 is changed, whereby the gap between the needle valve 11 and the valve seat 12, ie, the valve hole 1
8 can be adjusted (see FIG. 2).
Here, a liquid is used as the fluid R.

The vibrating body 10 uses a piezo element, an electromagnetic coil, and the like, and is covered with a cover 15 except for its tip. The cover 15 is fitted in the socket 16, and the socket 16 is fitted in the casing 13. A flow path 19 for the fluid R is formed in the casing 13 and the vibrating body 1
0 is inserted into the flow path 19. Further, the cable 17 is guided from the vibrating body 10 to the outside through the cover 15. The vibrating body 10 is vibrated by applying an AC voltage to the cable 17. The cover 15 is formed of a material that does not hinder the vibration of the vibrating body 10 and protects the vibrating body 10.

By applying an AC voltage to the cable 17, the vibrating body 10 vibrates at a frequency of about 100 Hz to 1 kHz. Here, since the AC voltage is always applied to the cable 17, the vibrating body 10 continuously vibrates. Since the tip of the vibrating body 10 is inserted into the flow path 19, the vibration of the vibrating body 10 is transmitted to the fluid R in the flow path 19.
Since the fluid R used here is a liquid, the vibrating body 10
Is transmitted by the fluid R existing in the flow path 19 and vibrates the fluid R passing through the valve hole 18.

In FIG. 1, a fluid R is introduced from an input port on the left side in FIG. 1, passes through a flow path 19, passes through a valve hole 18 which is a gap formed between the needle valve 11 and the valve seat 12, and Output to the middle right output port. Here, the needle valve 11
Is completely closed and the fluid R is not flowing, it is irrelevant and the description is omitted.

On the other hand, when a minute valve hole 18 is formed between the needle valve 11 and the valve seat 12, the fluid R flows through the valve hole 18 in a very small amount. Here, foreign matters larger than or equal to the size of the valve hole 18 are removed by a filter (not shown) provided upstream of the flow control valve 1. However, as shown in FIG. 2, even if the foreign matter is fine enough to pass through the filter, a plurality of foreign matters may collect and flow, and may push each other and accumulate in the valve hole 18. Also, once the foreign matter starts to accumulate, fine foreign matter that flows later accumulates at the same location,
In some cases, clumps of foreign matter are formed.

The vibration of the vibrating body 10 is transmitted to the fluid R in the flow path 19 and also to the fluid R flowing through the valve hole 18. This vibration accompanies the movement of the fluid R in a direction different from the flow direction, and vibrates the lump of foreign matter accumulated in the valve hole 18 to break it apart and break it apart. Each foreign substance is in the valve hole 18
Each of the separated foreign substances passes through the valve hole 18 and is discharged together with the fluid R to the outlet.

In this way, by transmitting the vibration of the vibrating body 10 to the fluid R, the lump of fine foreign matters accumulated in the valve hole 18 is vibrated and broken, and is separated and separated from the valve hole 18. It is possible to prevent minute foreign matter from clogging the valve hole 18. Therefore, proper operation of the flow control valve 1 can be ensured without giving an unexpected change to the flow rate or deteriorating the movement of the needle valve 11.

[Second Embodiment] Next, a second embodiment of the present invention will be described in detail with reference to the drawings. The configuration of the flow control valve according to the second embodiment will be described with reference to FIG. FIG. 3 is a sectional view showing a schematic configuration of the flow control valve 2 according to the present embodiment. Since the basic structure is the same as that of the first embodiment, the same reference numerals are given to the same members, and only different portions will be described.

The flow control valve 2 according to the second embodiment comprises:
As shown in FIG. 3, the vibrating body 10 is fixed to one end of the valve rod 14. Therefore, the vibration of the vibrating body 10 is transmitted to the fluid R via the valve rod 14 and the needle valve 11. By transmitting the vibration of the vibrating body 10 to the fluid R in this manner, the lump of fine foreign matters accumulated in the valve hole 18 is vibrated and broken, and is separated and separated from the valve hole 18. Can be prevented from being clogged with fine foreign matter. Therefore, an unexpected change may be given to the flow rate or the needle valve 11
Therefore, proper operation of the flow control valve 1 can be ensured without deteriorating the movement of the valve.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that improvements and modifications can be made without departing from the spirit of the invention. For example, in each of the above-described embodiments, the vibrating body 10 is always operated. However, the vibrating body 10 may be operated periodically at regular intervals, or an unexpected change may occur in a measurement result of a flow meter provided downstream. It may be activated when it appears. Further, for example, in each of the above-described embodiments, the vibrating body 10 is provided in the flow path 19 or on the valve rod 14.
The vibrating body 10 may be provided in the vicinity of the valve seat 12 or an appropriate part of the casing 13.

[0024]

According to the first aspect of the present invention, the fluid vibrating means is operated to vibrate the fluid flowing through the valve hole. Therefore, the fine foreign matter that has accumulated in the valve hole is shaken away. As a result, it is possible to prevent the valve hole from being clogged with minute foreign matter, and it is possible to ensure the proper operation of the flow control valve.

According to the second aspect of the present invention, the vibrator provided in the flow path upstream of the valve hole is operated to vibrate the fluid flowing through the valve hole. Thereby, the same operation and effect as the first aspect of the invention can be obtained.

According to the third aspect of the present invention, the fluid flowing through the valve hole is vibrated by operating the vibrating body provided on either the valve body or the casing including the valve seat. Thereby, the same operation and effect as the first aspect of the invention can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a schematic structure of a flow control valve according to a first embodiment.

FIG. 2 is a partial cross-sectional view showing a schematic structure of a flow control valve according to the first embodiment.

FIG. 3 is a cross-sectional view showing a schematic structure of a flow control valve according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flow control valve 2 Flow control valve 10 Vibrator 11 Needle valve 12 Valve seat 13 Casing 18 Valve hole 19 Flow path

Claims (3)

[Claims] 1. A flow control valve in which the amount of fluid flowing through a valve hole is adjusted by moving a needle valve with respect to a valve seat, wherein a fluid vibration means for vibrating the fluid is provided. A flow control valve characterized by the above. 2. The flow control valve according to claim 1, wherein the fluid vibration means is a vibrator provided in a flow path upstream of the valve hole. 3. The flow control valve according to claim 1, wherein the fluid oscillating means is a vibrating body provided in one of the valve body and a casing including the valve seat.