JP6824532B2 - Inline strainer - Google Patents

Description

The present invention relates to an in-line strainer incorporated for the purpose of removing foreign substances (contaminants) such as dust and sand mixed in a liquid in the middle of a piping line for supplying a liquid such as pesticide or water.

Liquids such as pesticides and water that are sprayed on plants such as vegetables and fruit trees are pumped up and flowed to the supply piping line. The piping line is connected to a spraying section, and the liquid supplied through the piping line is sprayed from the spray nozzle of the spraying section to a target location.

One of the in-line strainers installed in the middle of the piping line is shown in FIG. The in-line strainer of FIG. 4 is commercialized and sold by the applicant, and is introduced as a prior art in Patent Document 1 below {see FIG. 11 (a) of the same document}.

The in-line strainer 1A includes a housing 2 composed of a main body case 2a and a main body lid 2b, a valve 3 combining a valve body 3a, a valve seat 3b and a valve closing spring 3c, a filter element 4, a holding member 5 and a packing 6. It is a combination.

This in-line strainer 1A incorporates a cylindrical filter element 4 and a holding member 5 in a main body case 2a of a housing 2 having an inflow port 7, and further, a cannonball which is a component of a valve 3 inside the filter element 4. The valve body 3a and spring 3c of the mold are incorporated.

One end side of the filter element 4 is supported near the portion of the main body case 2a where the valve seat 3b is formed, and the other end side is supported by the holding member 5. The holding member 5 also serves as an end plug that closes one end (the end on the downstream side when viewed in the liquid flow direction) of the internal passage of the filter element 4.

In the illustrated in-line strainer 1A configured in this way, when a liquid is flowed through the piping line incorporating the liquid, the valve body 3a is pushed from the position in contact with the valve seat 3b to the outflow side by the pressure of the liquid. As a result, the valve 3 is opened.

Therefore, the liquid introduced from the inflow port 7 flows into the inner passage 9 inside the filter element 4, the liquid passes through the filter element 4 and moves to the outer passage 10, and foreign matter in the liquid is introduced during that time. It is filtered by the filter element 4.

The filtered liquid that has flowed into the external passage 10 passes through the passage groove 5e on the outer periphery of the holding member 5, passes through the openings between the bridge portions 5c adjacent to each other in the circumferential direction, and flows to the outflow port 8.

Japanese Unexamined Patent Publication No. 2011-25150

In the conventional in-line strainer shown in FIG. 4, when a hydraulic pressure is applied to the valve body 3a by passing liquid, a jarring sound (abnormal noise) is generated. The abnormal noise causes discomfort to the operator involved in liquid spraying.

Therefore, in the present invention, a filter element that allows liquid to permeate from the inside to the outside and filters it is arranged inside the main body case of the housing, and a bullet-shaped valve body that is brought into contact with and separated from the valve seat is spring-loaded inside the filter element. The problem is to eliminate the abnormal noise during liquid flow that occurs in the conventional in-line strainer that is urged toward the valve seat side in the valve closing direction.

In order to solve the above problems, in the present invention, a housing including a cylindrical main body case having an inflow port on one end side and a main body lid having a liquid outflow port, and a housing.
A valve seat provided inside one end side of the main body case, a valve body that can be moved in the axial direction to be brought into contact with the valve seat, and the valve body that is urged in the valve closing direction and pushed against the valve seat. A valve consisting of a spring to hit and
A cylindrical filter element incorporated inside the main body case,
It has a holding member which is arranged between the other end of the filter element and the main body lid, closes the other end side of the internal passage of the filter element, and supports the other end side of the filter element.
The valve body is a bullet-shaped poppet in which a plurality of ribs extending in the axial direction are provided on the outer periphery at intervals in the circumferential direction, and the valve body and the spring are arranged inside the filter element.
The pressure of the liquid to be filtered introduced from the inflow port into the main body case pushes the valve body from the position in contact with the valve seat to the outflow side to open the valve, whereby the filter element is opened. A liquid is introduced into the internal passage of the body, the liquid passes through the filter element, moves to the external passage, and flows to the outlet through a passage groove on the outer periphery of the holding member and an opening provided in the holding member. Inline strainer,
A cage is integrally formed on the holding member so as to extend toward the inlet side toward the inlet side of the filter element toward the vicinity of the valve seat, and the cage guides the axial movement of the valve body. I made it.

The guide of the valve body by the cage is provided by providing the cage with a guide groove extending axially from the extending end of the cage toward the downstream side, and the ribs on the outer periphery of the valve body are slidably fitted in the guide groove. It is preferable to do so.

The outer diameter of the ribless portion of the valve body should be set to a size that does not allow play (gap) to allow radial movement of the valve body with the inner diameter surface of the cage. A sliding gap that allows axial movement of the valve body is required.

The guide groove and the ribs on the outer periphery of the valve body guided by the guide groove may be arranged at least three in the circumferential direction at equal intervals.

In the in-line strainer of the present invention, a cage is integrally provided with a holding member that supports the filter element, and the cage guides the movement of the valve body of the valve. It no longer occurs.

From this, it is presumed that the abnormal noise in the conventional in-line strainer was generated by the vibration of the valve body.

It is sectional drawing which shows the embodiment of the in-line strainer of this invention. It is an exploded perspective view of the in-line strainer of FIG. It is sectional drawing along the X-ray line of FIG. It is sectional drawing of the in-line strainer before improvement.

Hereinafter, embodiments of the inline strainer of the present invention will be described with reference to FIGS. 1 to 3 of the accompanying drawings. The illustrated in-line strainer 1 is a combination of a housing 2, a valve 3, a filter element 4, a holding member 5, and a packing 6.

The housing 2 includes a cylindrical resin main body case 2a having an inflow port 7 on one end side, and a metal main body lid 2b having a liquid outflow port 8. The main body case 2a may be made of metal, but a resin housing is preferable because the weight of the strainer can be reduced.
In the following description, the side with the inflow port 7 of the housing 2 is regarded as the upstream side, and the side with the outflow port 8 is regarded as the downstream side.

In the main body case 2a made of resin, a metal sleeve may be embedded on one end side, and a female screw at the inflow port 7 into which the piping line is screwed may be formed in the metal sleeve.

A valve seat 3b is provided inside the main body case 2a on one end side. Further, the other end side of the main body case 2a and the main body lid 2b are hermetically sealed by the packing 6.

The valve 3 includes the valve seat 3b, a valve body 3a capable of moving in the axial direction to be brought into contact with and separated from the valve seat 3b, and the spring that urges the valve body 3a in the valve closing direction and presses the valve body 3b against the valve seat 3b. It consists of 3c.

The valve body 3a is a resin bullet-shaped member (poppet) in which a plurality of ribs 3d extending in the axial direction are provided on the outer periphery at intervals in the circumferential direction, and the liquid introduced inside the filter element 4 is adjacent to the valve body 3a. It flows to the other end side (the side with the holding member 5) of the filter element 4 through the matching ribs 3d and 3d.

The filter element 4 is incorporated inside the main body case 2a. One end side of the filter element 4 is arranged on the inflow side of the liquid and is supported by a cylindrical protruding portion cp (see FIG. 1) in which the valve seat 3b is formed on the inner diameter side inside the main body case 2a. Further, the other end side of the filter element 4 is arranged on the liquid outflow side and supported by the holding member 5.

The valve body 3a is inserted inside one end side of the filter element 4 so as to be movable in the axial direction, and the spring 3c is arranged between the valve body 3a and the holding member 5.

The inside of the filter element 4 is an internal passage 9, and the internal passage 9 is connected to the inflow port 7 via a valve 3. Further, an external passage 10 for passing the filtered liquid is provided between the outer circumference of the filter element 4 and the inner peripheral surface of the main body case 2a.

The holding member 5 is a member that closes the other end side of the internal passage 9, and is arranged inside the main body case 2a between the other end of the filter element 4 and the main body lid 2b.

The holding member 5 shown in the figure is made of resin and has an end plug portion 5a that closes the opening on the downstream side of the internal passage 9 of the filter element 4, a ring portion 5b that is supported by the main body lid 2b, and an end plug portion 5a and a ring portion. A bridge portion 5c connecting 5b, a plurality of protrusions 5d and passage grooves 5e provided alternately on the outer periphery of the end portion on the liquid outflow side of the end plug portion 5a in the circumferential direction, and the end plug portion 5a toward the upstream side. It is provided with a cage 5f that extends close to the valve seat 3b. A plurality of bridge portions 5c are provided at intervals in the circumferential direction.

The end plug portion 5a also serves as a support tool, and the other end side of the filter element 4 is supported by the end plug portion 5a.

The inner diameter of the cage 5f is set so that a portion of the valve body 3a without ribs 3d can enter with a sliding gap. The cage 5f is provided with a guide groove 11 extending in the axial direction from the extending end of the cage 5f toward the downstream side.

As shown in FIG. 3, a plurality of guide grooves 11 are provided at equal intervals in the circumferential direction (three in the figure). The number of guide grooves 11 installed is the same as the number of ribs 3d provided on the outer periphery of the valve body 3a. The arrangement pitch in the circumferential direction is also the same as that of the rib 3d.

The guide groove 11 is open to the tip of the cage 5f, and the guide groove 11 is open from the open end.
The rib 3d is inserted inside, and the valve body 3a is inserted inside the cage 5f.

Therefore, the axial movement of the valve body 3a is guided by the cage 5f, and the cage 5f suppresses the valve body 3a from swinging in the radial direction at each position of the axial movement.

In the illustrated in-line strainer 1 configured in this way, when a liquid is flowed through the piping line incorporating the liquid, the valve body 3a is pushed from the position in contact with the valve seat 3b to the outflow side by the pressure of the liquid. As a result, the valve 3 is opened, and the liquid introduced from the inflow port 7 flows into the internal passage 9 of the filter element 4.

After that, the inflowing liquid passes through the filter element 4 and moves to the external passage 10, during which the foreign matter in the liquid is filtered out by the filter element 4.

The filtered liquid that has flowed into the external passage 10 passes through the passage groove 5e on the outer periphery of the holding member 5, passes through the openings between the bridge portions 5c adjacent to each other in the circumferential direction, and flows to the outflow port 8.

The foreign matter that has been filtered and adhered to the inner diameter surface of the filter element 4 is swept away by the liquid introduced into the internal passage 9 and is deposited on the side of the filter element 4 near the outlet 8.

Further, as the clogging of the filter element 4 progresses, the amount of the valve body 3a pushed toward the outlet 8 side by the hydraulic pressure fluctuates (increases), whereby the increase in the pressure loss of the filter element 4 is suppressed.

The valve body 3a of the valve 3 is pushed to the downstream side by the introduction of the liquid and separates from the valve seat 3b. As a result, the restraint of the radial movement of the valve body 3a by the valve seat 3b is released.

However, since the movement of the valve body 3a to the downstream side is guided by the cage 5f, rattling of the valve body 3a in the cage 5f is unlikely to occur. It seems that this worked effectively to eliminate the generation of abnormal noise when passing liquid.

It is preferable to provide at least three guide grooves 11 provided in the cage 5f and ribs 3d on the outer periphery of the valve body 3a guided by the guide grooves 11.

In the case where the guide groove 11 and the rib 3d are 3 or more, the valve body 3a is held coaxially by the cage 5f, and the behavior of the valve body 3a is stable as compared with the case where the guide groove 11 and the rib 3d are only 2 rows. ..

If the number of guide grooves 11 is larger than necessary, the strength of the cage 5f is lowered. Therefore, it is preferable to limit the number of guide grooves to about 6 at most.

1,1A In-line strainer 2 Housing 2a Main body case cp Cylindrical protrusion 2b Main body lid 3 Valve 3a Valve body 3b Valve seat 3c Spring 3d Rib 4 Filter element 5 Holding member 5a End plug part 5b Ring part 5c Bridge part 5d Protrusion 5e Passage Groove 5f Cage 6 Packing 7 Inflow port 8 Outlet 9 Internal passage 10 External passage 11 Guide groove

Claims (2)

A housing (2) including a cylindrical main body case (2a) having an inflow port (7) on one end side and a main body lid (2b) having a liquid outlet (8).
A valve seat (3b) provided inside one end side of the main body case (2a), a valve body (3a) capable of axial movement to be brought into contact with and separated from the valve seat (3b), and the valve body (3a). ) Is urged in the valve closing direction and pressed against the valve seat (3b) with a spring (3c) and a valve (3).
A cylindrical filter element (4) incorporated inside the main body case (2a),
It is arranged between the other end of the filter element (4) and the main body lid (2b) to block the other end side of the internal passage (9) of the filter element (4) and the filter element (4). ) Has a holding member (5) that supports the other end side,
The valve body (3a) is a bullet-shaped poppet in which a plurality of ribs (3d) extending in the axial direction are provided on the outer periphery at intervals in the circumferential direction, and the valve body (3a) and the spring (3c) are provided. Arranged inside the filter element (4),
The pressure of the liquid to be filtered introduced from the inflow port (7) into the main body case (2a) pushes the valve body (3a) toward the outflow side from a position in contact with the valve seat (3b). The valve (3) is opened, whereby a liquid is introduced into the internal passage (9) of the filter element (4), and the liquid passes through the filter element (4) and becomes the filter element (4). It moves to the external passage (10) formed between the main body case (2a), and the outlet (outlet) is moved through the passage groove (5e) on the outer periphery of the holding member (5) and the opening provided in the holding member. It is an in-line strainer that flows in 8),
The holding member (5) is integrally formed with a cage (5f) that extends along the inner diameter surface of the filter element (4) toward the inflow port (7) toward the vicinity of the valve seat (3b). , The cage (5f) is configured to guide the axial movement of the valve body (3a) .
The cage (5f) has a guide groove (11) extending axially from the extending end of the cage (5f) toward the downstream side, and the outer circumference of the valve body (3a) is formed in the guide groove (11). The rib (3d) of the valve body (3d) is slidably fitted, and the rib (3d) is guided by the guide groove (11) to guide the axial movement of the valve body (3a) by the cage (5f). configured inline strainer. The guide groove (11) and the rib (3d) on the outer periphery of the valve body guided by the guide groove (11) have at least three rows, and the guide groove (11) and the rib (3d) are equally spaced in the circumferential direction. The in-line strainer according to claim 1, which is arranged while maintaining the above.

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