JP3006341U - strainer - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the workability when replacing the strainer pipe and to obtain a strainer structure that can efficiently remove the air in the strainer. [Structure] The strainer main body 1 is composed of an inlet side connecting portion 2, an outlet side connecting portion 3, a peripheral wall surface 4 formed in a tubular shape, and a protruding wall surface portion 5 projecting obliquely downward from the peripheral wall surface 4. . A pipe accommodating portion 12 accommodating a strainer pipe 20 is formed inside the protruding wall surface portion 5, and a lid member 14 is attached to an exchange port 13 formed at the lower end of the pipe accommodating portion 12. Perimeter wall 4
An outlet side boss seat 30 and an inlet side boss seat 40 are provided at the uppermost part of the above, and nipples 31 and 41 having caps 32 and 42 attached are screwed into the respective openings. When draining the liquid from the strainer main body 1 or filling the strainer main body 1 with the liquid, by removing the cap 32, air can be allowed to flow in and out, and the liquid can be smoothly discharged or filled. it can.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a strainer, and more particularly to a structure for facilitating attachment / detachment work of a strainer pipe housed inside the strainer.

[0002]

[Prior art]

 Conventionally, a strainer containing a strainer pipe inside may be attached to a pipe for transporting a liquid, so that solid substances mixed in the liquid may be captured by the strainer pipe. In this case, the strainer pipe is housed at an angle to the streamline connecting the inlet and outlet holes of the strainer, and the strainer pipe exchange port is provided on the end side of the strainer pipe, so the strainer as a whole It is formed in a Y-shaped three-pronged shape. The exchange port is usually sealed by a lid member attached by screwing. When replacing or cleaning the strainer pipe, first close the open / close valves attached to the front and rear pipes of the strainer body, remove the plug attached to the lid member, and drain the liquid inside. Next, remove the lid member, pull out the strainer pipe inside, and insert a new strainer pipe or a strainer pipe after cleaning. Then, after the lid member is attached again, the plug is attached, and then the front and rear on-off valves are opened to restore the normal state.

[0003]

[Problems to be solved by the device]

 However, in the conventional strainer described above, it is necessary to drain the internal liquid from the plug before taking out the strainer pipe, but since this plug has a small diameter and is usually installed diagonally downward, the liquid does not escape easily, There is a problem that it takes time to remove the work. In addition, since air remains inside the strainer after the strainer pipe is installed, the front and rear open / close valves are opened to force the air to flow down along with the liquid flow. However, as a result of this, there will be free air reservoirs inside the pipe immediately after replacement of the strainer pipe, so unsteady flow etc. will occur in the pipe, causing abnormal noise and pressure fluctuations in the pipe. , There is a risk of damaging all kinds of measuring gauges and pipe joints. Therefore, the present invention solves the above problems, and an object thereof is to improve workability when replacing the strainer pipe and to obtain a new structure of the strainer that can efficiently remove air in the strainer. .

[0004]

[Means for Solving the Problems]

 The present invention accommodates a strainer pipe between an inlet side pipe connecting part and an outlet side pipe connecting part in a tubular body having an inlet side pipe connecting part and an outlet side pipe connecting part, and can open / close the strainer pipe. In a strainer equipped with a strainer pipe accommodating part with a special exchange port, an openable outlet side opening is provided on the peripheral wall surface of the tubular body between the outlet side of the strainer pipe accommodating part and the outlet side pipe connecting part. It is a thing.

Here, it is preferable that the outlet side opening is formed substantially at the top of the peripheral wall surface.

Further, it is preferable to provide an openable inlet side opening portion on the peripheral wall surface of the tubular body between the inlet side pipe connecting portion and the inlet side of the strainer pipe accommodating portion.

Further, it is preferable that a connecting member for connecting a pipe is attached to the outlet side opening and a cap member is detachably attached to the outlet side of the connecting member.

Particularly, the inner and outer surfaces of the strainer may be coated with a resin layer.

In this case, the outlet side opening is provided with a connecting member for pipe connection which is attached from the outside, and the connecting member is provided with a seal member between the outlet side opening and the resin layer covering surface. And a contact surface that comes into contact with the uncovered surface of the resin layer at the outlet opening formed outside of the covered surface in the mounting direction of the connecting member. It is preferable to provide.

Further, it is preferable that a closing member for closing the exchange port is provided so as to be openable and closable, and an end face plate having a plurality of small openings is attached to the end face of the strainer pipe facing the inner surface of the closing member.

[0011]

[Action]

 According to the first aspect, by opening the outlet side opening, air can be introduced from the outlet side opening when discharging the liquid in the strainer, so that the liquid is smoothly discharged and the discharging speed is increased. At the same time, when the liquid is introduced from the inlet side after mounting the strainer tube, air escapes from the outlet side opening, so that the liquid can be filled in the strainer. The outlet side opening can also be used as an opening for measuring the internal pressure.

According to the second aspect, since the outlet side opening is formed substantially at the uppermost part of the peripheral wall surface, air can be introduced from the beginning at the time of discharging the liquid, so that the discharging speed of the liquid can be further increased. In addition, the air in the strainer can be almost completely evacuated when filling the liquid.

According to the third aspect, since the air can be introduced and discharged from the inlet side by the inlet side opening, the liquid discharging speed or the liquid filling speed can be increased. Further, the inlet side opening can be used as an opening for measuring the inlet side pipe pressure, and it is also possible to measure the differential pressure between the inlet side and the outlet side in combination with the outlet side opening.

According to the fourth aspect, by connecting the connecting member to the external pipe, the overflowed liquid can be discharged to a desired place, and the connecting member is attached with a detachable cap member. Therefore, the opening and closing work of the outlet side opening becomes easy.

According to the fifth aspect, it is possible to enhance the corrosion resistance of the strainer and prevent metal contamination of the liquid.

According to the sixth aspect, sealing is provided between the sealing surface of the connection member and the resin coating surface of the outlet side opening via the sealing member, and the connecting member is provided on the outside side of the outlet side opening. Since the abutting surface that abuts against the uncovered surface formed on the surface is provided, it is possible to ensure the connection and ensure the durability of the abutting surface by abutting each other on the uncovered surface. Therefore, even if the connecting member is frequently replaced, sealing leakage and damage to the resin layer can be prevented.

According to the seventh aspect, it is possible to prevent the liquid flow from directly colliding with the inner surface of the closing member by providing the end face plate on the strainer pipe, and the plurality of small openings formed on the end face plate allows the strainer pipe to be closed. It is possible to prevent the liquid flow from staying at the ends.

[0018]

【Example】

 Next, an embodiment of a strainer according to the present invention will be described with reference to the drawings. FIG. 1 shows the entire structure of the strainer of this embodiment. The strainer main body 1 includes an inlet side connecting portion 2 having an inlet hole 2a and a flange portion 2b, an outlet side connecting portion 3 having an outlet hole 3a and a flange portion 3b, and an inlet side connecting portion 2 to an outlet side connecting portion 3. The peripheral wall surface 4 is formed in a tubular shape, and a protruding wall surface portion 5 that projects obliquely downward from the middle of the peripheral wall surface 4 is roughly configured.

The projecting wall surface portion 5 forms a pipe accommodating portion 12 between the inlet side pipe interior 10 and the outlet side pipe interior 11 defined inside the strainer body 1. A strainer pipe 20 is inserted into the pipe accommodating portion 12, and an upper end portion of the strainer pipe 20 is fitted to an edge portion of an introduction opening 10a communicating with the inside 10 of the inlet side pipe. An exchange port 13 is formed at the lower end of the tube housing portion 12, and a lid member 14 is screwed to the exchange port 13. A plug 15 for draining liquid is screwed into the lid member 14.

The strainer pipe 20 includes a strainer cylinder 21 formed by forming a thin plate of stainless steel into a cylindrical shape, stainless steel support rings 22 and 23 annularly attached to the upper and lower ends of the strainer cylinder 21, and a strainer. It comprises an end face plate 24 made of stainless steel attached to the lower end face of the mesh cylinder 21. A large number of small holes 21a are formed in the strain net tube 21, and various nets are further laid inside the small hole 21a when the trapped particle size is small. The end plate 24 is provided with a plurality of through holes 24a described later.

The lid member 14 includes an inner surface 14a that is depressed in a dome shape, and a plurality of convex portions 14b are formed on the inner surface 14a. At the edge of the inner surface 14a, a step portion 14c is formed which is fitted to the lower end edge of the strainer pipe 20, that is, the lower end portions of the mesh screen cylinder 21 and the support ring 23. A flange portion 14d is formed on the outer edge portion of the lid member 14 and is screwed to the flange portion 5a of the opposing protruding wall surface portion 5.

An outlet side boss seat 30 and an inlet side boss seat 40 are formed at the uppermost portion of the peripheral wall surface 4. The outlet side boss seat 30 is provided on the peripheral wall of the outlet side pipe inside 11, and the inlet side boss seat is provided on the peripheral wall of the inlet side pipe inside 10. Nipples 31 and 41 are screwed into the outlet side boss seat 30 and the inlet side boss seat 40, respectively, and caps 32 and 42 are screwed into the outer ends of the nipples 31 and 41, respectively.

In the above embodiment, the strainer tube replacement or cleaning work is performed as follows. As shown in FIG. 2 (a), the strainer main body 1 is assembled in the pipe by connecting the inlet-side connecting portion 2 to the inlet-side pipe IN and connecting the outlet-side connecting portion 3 to the outlet-side pipe OUT. ing. An opening / closing valve (not shown) is attached to each of the inlet side piping IN and the outlet side piping OUT so that the front and rear of the flow path can be shut off. After shutting off the on-off valves of the front and rear pipes, the cap 32 attached to the nipple 31 of the outlet side boss seat 30 is removed, and then the plug 15 is removed. When the plug 15 is pulled out, air can flow into the inside through the outlet side boss seat 30, so that the liquid vigorously flows out from the drain hole 15a of the lid member 14, and the liquid inside can be discharged in a short time.

When the drainage of the liquid is completed, the lid member 14 is removed and the strainer tube 20 is pulled out for cleaning. After the cleaning is completed, the strainer pipe 20 is again inserted through the exchange port 13, and the lid member 14 to which the plug 15 is attached is screwed to the protruding wall surface portion 5. Then, when the opening / closing valve on the inlet side pipe IN side is gradually opened, the liquid is filled from the inlet side through the strainer pipe 20 as shown in FIG. 2B. Here, since the outlet side boss seat 30 is open, air can flow out from the outlet side boss seat 30 to completely fill the strainer body 1 with the liquid. When the liquid starts to flow out from the outlet side boss seat 30, the cap 32 is attached to the nipple 31, and then the opening / closing valve of the outlet side pipe OUT is opened to restore the original state.

In this case, the discharge pipe 33 may be connected in advance to the nipple 31 of the outlet side boss seat 30 to guide it to the drain. In this way, even if the liquid overflows from the outlet side boss seat 30 after the inside of the strainer body 1 is completely filled with the liquid, the periphery of the strainer body 1 is not wetted. In addition, the inlet side boss seat 40 is provided to completely remove the air in the inlet side tube inside 10 when filling the liquid, or to discharge the liquid from the drain hole 15a of the lid member 14 when discharging the liquid. For raising, the cap 42 may be removed from the nipple 41 to perform the above work.

In the above embodiment, the outlet-side boss seat 30 and the inlet-side boss seat 40 provided on the uppermost part of the peripheral wall surface 4 can be used for measuring the pressure inside the pipe. In particular, when the strainer pipe 20 is clogged, the pressure on the inlet side rises and the pressure on the outlet side falls, so it is necessary to connect either of the boss seats 30 and 40 to a pressure gauge for pressure measurement. From, it is possible to know when to replace the strainer pipe 20. In this case, the clogging state of the strainer pipe 20 can be known more accurately by measuring the pressure difference between the inside 11 of the outlet side pipe and the inside 10 of the inlet side pipe using both boss seats 30 and 40. .

Next, the surface of the above-mentioned embodiment coated with a resin layer by a plastic lining will be described. In general, plastics have excellent corrosion resistance to chemicals such as acids and alkalis, so the strainer corrosion can be prevented by coating the resin layer. It is also effective in preventing contamination of the internal liquid by metal ions. The lining method includes a liquid coating method, a powder baking method, an electrostatic coating method, and a thermal spraying method. In this embodiment, the preheated strainer body 1 is dipped in a fluidized bed of plastic powder, and baking lining is performed. Adopted the method. As the resin material for the powder coating method, there are various materials such as nylon 11, nylon 12 and epoxy resin depending on the application, but nylon 11 was used in this embodiment.

The coating of the resin layer was performed on almost the entire inner and outer surfaces of the strainer body 1. However, as shown in FIG. 3, the abutted surface 30a that abuts the abutting surface 31a of the nipple 31 and the screwing surface 30b that is screwed into the nipple 31 are used when the nipple is immersed in nylon powder. A plug member having substantially the same shape as 31 is attached to the outlet side boss seat 30 to form an uncoated surface on which the resin layer 50 is not formed. Then, the nipple 31 is screwed to the screwing surface 30b of the outlet side boss seat 30 with a sealing tape interposed, if necessary, until the contact surface 31a formed on the distal end side thereof contacts the contact surface 30a. Is entered. When the abutting surface 31a and the abutted surface 30a come into contact with each other, the inclined sealing surface 31b formed on the inner side of the boss seat subsequent to the abutting surface has an inclined sealing surface 31c covered with the resin layer 50. It is closely adhered to the nipple 31 via an O-ring 51 for sealing to seal between the outer peripheral portion and the inner portion of the nipple 31.

As described above, the sealing between the strainer body 1 covered with the resin layer and the nipple 31 is performed by the seal surface 31b and the sealed surface 30c on the inner side of the outlet side boss seat 30 via the O-ring. Done. Further, an abutting surface 31a and an abutted surface 30a, which is an uncoated surface, are provided on the outer side of the seal portion, so that the outlet side boss seat 30 and the nipple 31 are accurately positioned. Here, since the sealing is performed on the coated surface of the resin layer, corrosion of the boss seat can be prevented. On the other hand, since the positioning by contact is performed on the uncoated surface, the accuracy of contact can be improved and the accuracy can be maintained without damaging the resin coating due to repeated attachment and detachment of the nipple. Therefore, the positioning by contact can improve the reliability of the seal portion, and even if the nipple is frequently attached and detached, the positioning accuracy is less deteriorated and the seal leakage can be reliably prevented. The configuration around the outlet side boss seat described above can be applied to the inlet side boss seat 40 and the nipple 41 in exactly the same manner.

FIG. 4 is an enlarged view showing a portion where the lid member 14 covered with the resin layer and the strainer pipe 20 face each other, separated from each other. A support ring 23 and an end face plate 24 are attached to the lower end portion of the strainer pipe 20, and the lower end portion and the step portion 14c of the lid member 14 are tightly adhered to each other to separate the inside and outside of the mesh screen cylinder 21. The end face plate 24 faces the inner surface 14a of the lid member 14, and a through hole 24a communicates between the space formed by the concave surface of the inner surface 14a and the inner space of the mesh screen cylinder 21. Conventionally, the lower end surface of the strainer pipe 20 is open, and the inflowing liquid is configured to directly collide with the inner surface 14a. However, in this embodiment in which resin is coated, the resin layer 50 covering the inner surface 14a is the liquid. An end face plate 24 is provided on the lower end face thereof so as not to be worn or peeled off by the impact of. The end plate 24 reduces the velocity of the liquid hitting the inner surface 14a, and prevents the liquid from staying at the lower end portion of the strainer pipe 20 by the through hole 24a thereof so that the clogging is not concentrated at the lower end portion. ing.

It should be noted that on the inner surface 14 a, convex portions 14 b that project toward the end face plate 24 of the strainer tube 20 are provided in a crossed state so as to be vertically and horizontally combined. These convex portions 14b are for preventing the liquid flow passing through the through holes 24a from vigorously flowing on the inner surface 14a along the surface, and the surface of the inner surface 14a, that is, the resin layer on the surface. Has the effect of further reducing wear. The protrusions are formed by appropriately changing the number and intervals depending on the diameters of the lid member 14 and the strainer pipe 20, the positions and the numbers of the through holes 24a, and the like.

[0032]

[Effect of device]

 As described above, according to the present invention, by opening the outlet side opening, air can be introduced from the outlet side opening when discharging the liquid in the strainer, so that the liquid can be smoothly discharged, The discharge speed can be increased, and when the liquid is introduced from the inlet side after the strainer pipe is installed, air is released from the outlet side opening, so that the strainer can be filled with the liquid. The outlet opening can also be used as an opening for measuring the internal pressure.

By forming the outlet side opening substantially at the top of the peripheral wall surface, air can be introduced from the beginning when the liquid is discharged, so that the liquid can be discharged more efficiently and the liquid filling can be performed. At times, the air in the strainer can be deflated almost completely.

By providing the inlet side opening, air can be introduced and discharged also from the inlet side, so that it is possible to increase the liquid and discharge speed or the liquid filling speed, and to measure the internal pressure on the inlet side. It can also be used as the opening of the inlet, and it is also possible to measure the differential pressure between the inlet side and the outlet side by using it together with the outlet side opening.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of an embodiment of a strainer according to the present invention.

FIG. 2 is an explanatory diagram (a) showing a state when the liquid is discharged in the same embodiment, and an explanatory diagram (b) showing a state when the liquid is filled in the same embodiment.

FIG. 3 is a cross-sectional view (a) of the vicinity of the outlet side boss seat of the embodiment,
FIG. 6B is an enlarged cross-sectional view (b) showing the seal portion of the boss seat and the nipple.

FIG. 4 is an exploded perspective view showing a facing portion of a strainer tube and a lid member.

[Explanation of symbols]

 1 Strainer main body 2 Inlet side connection part (inlet side pipe connection part) 3 Outlet side connection part (outlet side pipe connection part) 4 Circular wall surface 5 Projecting wall surface part (strainer pipe accommodating part) 13 Replacement port 14 Lid member (closing member) 14a Inner surface 14b Convex part 15 Plug 20 Strainer pipe 24 End face plate 24a Through hole (small opening) 30 Outlet side boss seat (outlet side opening) 31,41 Nipple (connecting member) 32,42 Cap (cap member) 40 Inlet side Boss seat (opening on the entrance side)

Claims (11)

[Scope of utility model registration request] 1. A strainer pipe for accommodating a strainer pipe between the inlet side pipe connecting part and the outlet side pipe connecting part in a tubular body having an inlet side pipe connecting part and an outlet side pipe connecting part In a strainer provided with a strainer pipe accommodating portion having an openable and closable exchange port, a separable outlet is provided on a peripheral wall surface of the tubular body between the outlet side of the strainer pipe accommodating portion and the outlet side pipe connecting portion. A strainer having a side opening. 2. The strainer according to claim 1, wherein the outlet side opening is formed substantially at the top of the peripheral wall surface. 3. The opening according to claim 1, wherein an openable inlet side opening is provided on a peripheral wall surface of the tubular body between the inlet side pipe connecting portion and an inlet side of the strainer pipe accommodating portion. Strainer to be. 4. The strainer according to claim 1, wherein a connecting member for connecting a pipe is attached to the outlet side opening, and a cap member is detachably attached to the outlet side of the connecting member. 5. The strainer according to claim 1, wherein the inner and outer surfaces of the strainer are covered with a resin layer. 6. The outlet member according to claim 5, wherein the outlet side opening is provided with a connecting member for pipe connection, which is attached from the outside, and the connecting member is covered with the resin layer in the outlet side opening. A sealing surface that comes into contact with the surface via a sealing member, and a mounting direction of the connection member with respect to a non-coated surface of the resin layer in the outlet-side opening that is formed outside the covered surface. A strainer having a contact surface for contacting with the strainer. 7. The end member according to claim 5, wherein a closing member for closing the exchange port is provided to be openable and closable, and an end face plate having a plurality of small openings is attached to an end face of the strainer pipe facing an inner surface of the closing member. A strainer that is characterized by 8. The connection member according to claim 3, wherein a connecting member for connecting a pipe is attached to the inlet opening and the outlet opening, and a cap member is detachably attached to an outlet of the connecting member. Strainer to be. 9. The inner surface and the outer surface of the strainer according to claim 8, wherein a resin layer covers the inner and outer surfaces of the strainer, and the connecting member is provided between the inlet side opening portion and the outlet side opening portion between the resin layer coating surface. A sealing surface that contacts through the sealing member,
A contact surface that abuts in the mounting direction of the connecting member is provided on the inlet side opening and the outlet side opening that are formed on the outer side of the covering surface with respect to the non-covering surface of the resin layer. A strainer characterized by that. 10. The end member according to claim 8, wherein a closing member for the exchange port is provided so as to be openable and closable, and an end face plate having a plurality of small openings is attached to an end face of the strainer pipe facing an inner surface of the closing member. Is a strainer. 11. The end member according to claim 9, wherein a closing member for the exchange port is provided to be openable and closable, and an end face plate having a plurality of small openings is attached to an end face of the strainer pipe facing an inner surface of the closing member. Is a strainer.