JP2574452Y2 - Strainer for fluid equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a strainer for fluid equipment, for example, suitable for being provided in a pilot flow path of a pilot valve for controlling a flow of a fluid such as agricultural water which is liable to be mixed with foreign matter. The present invention relates to a structure of a strainer having a self-cleaning function using a vortex flow of a fluid .

[0002]

2. Description of the Related Art In order to control the flow of irrigation water, for example, a pilot type water supply control valve is used as shown in Japanese Utility Model Publication No. 60-21962. In this pilot-type water supply control valve, as shown in FIG. 6, a pilot flow path e is formed in a diaphragm-type main valve body d which is arranged so as to open and close a main flow path c in a main body b of a water supply valve a. The pressure chamber f above the main valve element d and the main flow path c are communicated via the pilot flow path e.

Incidentally, since a large amount of foreign matter is mixed in such irrigation water, in order to prevent such foreign matter from flowing into the pressure chamber f through the pilot passage e, the pilot A strainer h is arranged on the inlet side of the flow path to prevent such foreign matter from entering the pilot flow path. However, the conventional strainer h is simply formed of a metal net, or as shown in FIG.
Since the structure is such that a plurality of slits j are simply formed at the bottom of the cup-shaped member i, and the fluid flowing in the main flow path c directly collides with the strainer, foreign matter is generated in the mesh or slit. There is a problem that clogging occurs due to piercing, which hinders the operation of the pilot type water supply valve.

[0004]

[Problem to be solved by the present invention] The problem to be solved by the present invention is to positively generate a vortex in the fluid flow in the main flow path.
To prevent clogging by foreign matter due to the eddy current.
There is to provide a strainer to allow cleaning the foreign matter clogged.

[0005]

This invention SUMMARY OF THE INVENTION, the fluid device having an inlet, an outlet, a main flow path through the fluid outlet from said inlet, and a member for controlling the flow of fluid through the main flow path A strainer attached to one surface of the controlling member in the main flow path of the fluid device, the mounting surface engaging the one surface of the controlling member, and A body having a conical surface protruding from the one surface toward the inflow side of the fluid, wherein the conical surface has a plurality of grooves extending in a direction toward a vertex of the conical surface around an axis of the conical surface. The main body has a flow path having one end communicating with the inside of the groove and near the apex and the other end opening on the other surface side of the controlling member on the side opposite to the conical surface. It is formed and formed.

A plurality of first through holes in which the flow passage opens in the groove at a position close to the apex, and the other of the controlling members extending along the axis and opposite to the conical surface. It may have a second through hole opening on the surface side, and an orifice connecting the first and second through holes, and the main body is formed of a single member. Or a first portion in which a portion at the tip in the radial center of the conical surface is formed,
An annular second portion fitted to the first portion,
The second portion may be formed with a radially outer portion of the conical surface, and the outer portion may be formed with the plurality of grooves. Further, the conical surface may be a conical surface or a polygonal conical surface.

[0007]

In the strainer having the above structure, the fluid flows toward the strainer at a substantially right angle to the first surface, and when the fluid strikes the strainer, the fluid is turned in the radial direction by the action of the conical surface. Part of the fluid then flows through the through hole to the opposite side of the strainer. When there is a foreign substance in the fluid, the movement of the foreign substance is also directed in the radial direction by the action of the conical surface,
It becomes difficult to flow into the through hole. When the fluid moves in the groove portion in the radial direction, a swirl is formed by the action of the groove, and the foreign matter that has stopped at the entrance of the through hole is washed away.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a pilot control valve 10 to which a strainer 1 according to one embodiment of the present invention is attached. In the figure, reference numeral 11 denotes a main body in which a central inlet 12, an outlet 13 around the inlet 12, and a valve seat 14 around the open end of the inlet 12 are formed. Reference numeral 15 denotes a cover fixed on the main body 11 by a stopper 17 having bolts and nuts. A diaphragm 20 is disposed in a chamber 18 defined by the main body 11 and the cover 15. The periphery of the diaphragm 20 is fixed and held by the main body 11 and the cover 15. On both surfaces of the diaphragm 20, metal plate-shaped support plates 21 and 22 are arranged. On a surface of the diaphragm 20 on the valve seat 14 side, a valve body 24 formed of an elastic material that engages with the valve seat 14 is received and fixed by a support plate 22. The valve body 24 has a hole 25 for mounting the strainer 1 according to one embodiment of the present invention. In a pressure chamber 26 formed between the diaphragm 20 and the cover 15, a spring 28 for elastically pressing the diaphragm 20 and the valve body 24 toward the valve seat 14 is disposed. The pressure chamber 26 is connected to an external pilot valve 32 via a connector 30 fixed to the cover 15 .

The strainer 1 is fixed to the valve element 24. In this embodiment, the strainer 1 has a main body composed of a first portion 2a and a second portion 2b, as is apparent from FIGS. The first portion 2a has a conical surface 3a formed at the tip (the lower end in FIGS. 1 and 2), and the diameter decreases from the end position of the conical surface 3a to form the shaft portion 4a. The rear part of the shaft (see FIGS. 1 and 2
(Upper end) is formed with a through hole 5a extending in the axial direction and opening at the rear end. This through hole 5a is also formed in the center of the shaft portion and extends through the diametrically extending through hole 6a. Is communicated with the outer peripheral portion. The shaft portion 4a is fitted into the hole 25 of the valve body 24, and the rear end of the shaft portion 4a is supported by the caulking portion 7a.
It is fixed to. The through holes 5a and 6a define a pilot passage for the pilot control valve 10.

As can be seen from FIGS. 1 and 2, the second portion 2b of the strainer 1 is formed as a generally annular frustoconical body having a predetermined thickness, and the first portion 2b is provided at the center thereof. Holes 4b of different diameters through which the shaft portion 4a of the portion 2a passes
And 5b have a conical surface 3b formed therearound.
In the conical surface 3b, a plurality of grooves 8b extending in the radial direction are formed at equal intervals in the circumferential direction. The second portion 2b further has grooves 8 formed at equal intervals in the circumferential direction around the hole 5b and close to the rear of the conical surface of the first portion 2a.
A plurality of narrow slit-shaped through-holes 6b that open inside b are formed. As is apparent from FIG.
The end of the radial outer periphery is tapered and ends. The orifice 9 formed in the portion 2a
The effective area of a is smaller than the sum of the effective areas of the slit-shaped through holes 6b, and the diameter is larger than the slit width.

The strainer 1 has the shaft portion 4a of the first portion 2a fitted into the smaller hole 5b of the second portion 2b, and the shaft portion 4a is connected to the hole 25 of the valve body 24. And the rear end of the shaft portion is fixed to the support plate 21 by a caulking portion, whereby the diaphragm 20 and the valve element 24 are fixed. The second portion 2b is fixed in a state of being sandwiched between the valve body 24 and the tip of the first portion 2a. The first part and the second part are preferably
Made of plastic material like polypropylene, polyacetal. The first portion and the second portion may be formed separately as in the embodiment, or may be formed integrally from the same material.

In the pilot control valve 10 having the above structure, when the pilot valve 32 is opened and the fluid in the pressure chamber 26 is discharged to the outside through the pilot valve, the fluid pressure in the pressure chamber 26 is reduced to the inlet 12. Diaphragm 20, support plates 21, 22 and valve body 24
Is moved upward (in FIG. 1) against the spring 28 by the fluid pressure on the inlet side, and the valve element 24 is separated from the valve seat as shown in the right half of FIG. Therefore, the fluid on the inlet 12 side flows out of the pilot type control valve 10 from the outlet 13. In this case, the fluid flowing into the control valve from the inlet tries to rise straight up in the inlet (in FIG. 1) and collide with the valve element 24, but the fluid of the strainer 1 attached to the valve seat side surface of the valve element is used. By the action of the conical surface 3a, the flow of the fluid is changed obliquely upward in a divergent shape and flows toward the outlet 13 side,
Part of the fluid flows into the slit-shaped through hole 6b,
b, through the through hole 6a, the orifice portion 9a and the through hole 5a into the pressure chamber 26. However, since the flow rate of the pilot valve 32 is larger than the flow rate of the orifice portion 9a, the pressure in the pressure chamber cannot be increased, and the valve body 24 remains elevated. Therefore, the fluid continues to flow through the control valve 10.

Next, the pilot valve 32 is closed and the pressure chamber 26 is closed.
When the fluid discharge from the pressure chamber is stopped, the fluid pressure in the pressure chamber becomes
The fluid flowing through the pilot passage defined by the through hole 6b, the hole 4b, the through hole 6a, the orifice portion 9a and the through hole 5a has the same pressure as the fluid pressure on the inlet 12 side. For this reason, the diaphragm 20 and the valve element 24
By the action of 8, it is pushed to the valve seat 14 side and abuts on the valve seat to prevent communication between the inlet 12 and the outlet 13. Therefore, the control valve 10 is closed and no fluid flows.

A fluid is supplied from the inlet 12 side to the slit-shaped through hole 6.
b, when solid foreign matter is mixed in the fluid, the foreign matter tries to flow into the through hole 6b of the slit.
Since it does not hit the entrance of b, it becomes difficult to flow. Moreover, even if the through hole 6b is clogged by foreign matter, a spiral flow is generated in the groove 8b formed in the conical surface 3b as shown in FIG. I do. Therefore, the occurrence of clogging due to foreign matter can be prevented. Of course, the foreign matter that has passed through the slit through hole 6b easily passes through the orifice portion 9a.

In the above embodiment, the conical surface is a conical surface, but may be a polygonal conical surface. Further, the shape of the groove is not limited to the shape shown in the figure, but may be another shape. The outflow side of the through hole 6b of the slit is wider than the inflow side.

[0016]

According to the present invention, the following effects can be obtained. (A) Since the flow direction of the fluid is changed by providing a conical surface on the inlet side of the through hole that defines the pilot passage, foreign substances in the fluid do not directly hit the inlet of the through hole, and clogging is unlikely to occur. . (B) Even if foreign matter is caught on the inlet side of the through-hole, a washing action is caused by the swirling flow or turbulent flow, and the foreign matter can be washed away. (C) The maintenance of the strainer becomes unnecessary, and the management of the control valve is simplified.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pilot control valve to which an embodiment of a strainer according to the present invention is attached.

FIG. 2 is an enlarged sectional view of the strainer of FIG.

FIG. 3 is a view taken along line III-III in FIG. 2;

FIG. 4 is a diagram illustrating generation of a spiral flow generated in a groove.

FIG. 5 is a plan view of a part of one part of the strainer.

FIG. 6 is a sectional view of a pilot control valve using a conventional strainer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Strainer 2a, 2b Part 3a, 3b Conical surface 5a, 6a, 6
b Through hole 8b Groove

Claims (6)

(57) [Scope of request for utility model registration] [Claim 1] with an inlet (12), flow through the outlet (13), a main flow path through the fluid outlet from said inlet, a main flow path
A strainer (1) for a fluid device (10) having a member (20, 21, 22, 24) for controlling body flow, the strainer (1) for the member for controlling in the main flow path of the fluid device.
The one of the controlling members attached to one surface;
A mounting surface engaging the other surface and the one of the controlling members.
Conical surface (3) protruding toward the inflow side of the fluid from the other surface
a, 3b) having a plurality of grooves (8) extending in a direction toward the apex of the conical surface.
b) is formed around the axis of the conical surface, and the body has one end communicating with the groove (8b) at a position close to the vertex and the other end having the control member on the side opposite to the conical surface. The other member
A strainer for a fluid device, wherein a flow path that opens on the side of the surface is formed. 2. The strainer for a fluid device according to claim 1, wherein the flow path opens into the groove at a position near the apex , and the first through hole (6b) extends along the axis. Stretch
And the other side of the controlling member on the side opposite to the conical surface
A second through-hole (5a) opening at the first through-hole and the second through-hole.
And an orifice (9a) connecting the through hole of (a). 3. The strainer according to claim 1, wherein the main body is formed of a single member. 4. The strainer for a fluid device according to claim 1, wherein the body has a first portion (2a) formed at a tip thereof with a portion (3a) at a radial center of the conical surface.
And an annular second portion (2) fitted to the first portion.
b), wherein the second portion is formed with a radially outer portion (3b) of the conical surface, and the outer portion is formed with the plurality of grooves (8b). 5. The strainer for a fluidic device according to claim 1, wherein the conical surfaces (3a, 3b).
Is a conical surface. 6. The strainer for a fluidic device according to claim 1, wherein said conical surfaces (3a, 3b).
Is a polygonal cone.