JP2013249934A - Strainer, and method for installing element of the strainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably, simply and safely install a screen at a predetermined attaching position of a strainer body not only when the diameter of the screen of the strainer is small but also even if the screen is large in size and heavy in weight, for example, the diameter of the screen is about 30 cm, the length thereof is about 1 m, and the weight thereof is about 11 kg.SOLUTION: A strainer 1 includes: a cylindrical body 1 which communicates with and installed in a pipe 5 through which fluid containing foreign matters flows; a cylindrical screen 3 which is arranged with a space being formed between the body 1 and itself, catches foreign matters by making the fluid flow in the pipe therein, and returns them to the pipe; and a base member 4 which is arranged in the pipe 5, and has a fluid flow-in hole 4a, and supports the screen 3 at a predetermined fitting position. The base member 4 has a tubular projecting part 6 which is formed at an edge of the flow-in hole 4a, has an outside diameter substantially equal to the inside diameter of the screen 3, and is fitted to the screen 3. A worker may only push the screen 3 into the projecting part 6.

Description

  The present invention relates to a strainer and a method for installing a strainer element.

  Various fluids such as water, oil, gas, air, and steam that flow through various pipes used in water supply equipment, water supply equipment, firefighting equipment, and various industrial equipment in buildings and houses, foreign matter, corrosion products in the pipes , Gasket strips and dust are unavoidably mixed. If these foreign objects or dust are left unattended, the valve seats of various valves placed in various places on the piping may be damaged to shorten their lifespan, various devices may not operate normally, or in the worst case, the devices may be damaged. It reaches.

  In order to prevent the occurrence of these problems, it is necessary to capture and remove foreign matter and dust in the fluid having a relatively large diameter (for example, about 50 μm to several mm or more) at various points in the piping. A strainer is placed connected to the piping. Conventionally used strainers include T-type, Y-type, and basket-type. Both types of strainers usually have a cylindrical main body that is installed in communication with a pipe, and a cylindrical element that is arranged inside the main body so as to form a small gap between the main body. The element is composed of a wire mesh (screen), perforated plate or gap plate, etc. The fluid that has flowed through the pipe flows into the element, and foreign matter or dust in the fluid is trapped inside the element before it enters the pipe. Return. In this way, foreign matter and dust in the fluid are captured by the strainer element and removed from the fluid.

  When the element is clogged, the foreign matter and dust capturing performance is impaired. Therefore, the element is used after being cleaned or replaced at an appropriate timing. At this time, the element is installed inside the strainer body by inserting the tip of the element into an annular groove having the same diameter and thickness as the element formed in the base member arranged in the pipe. This is done.

  For example, Patent Documents 1 to 5 disclose inventions related to such strainers.

JP 2004-230305 A JP 2000-37608 A Japanese Patent No. 4774369 Japanese Patent No. 3730718 Japanese Patent No. 3348021

  When the element is installed inside the strainer body, the operator holds the rear end of the element and inserts the tip of the element into an annular groove formed in the base member arranged in the pipe. It is necessary to push the rear end of the element completely into the groove until the element is installed at a predetermined mounting position.

  However, when the piping is a large-diameter pipe of a district heating / cooling facility, for example, the diameter of the main body of the strainer and the element (screen made of wire mesh) is about 30 cm, the length of the element is about 1 m, and the weight is about 11 kg. (A) If the operator's pushing force is insufficient, the tip of the element cannot be pushed completely into the groove, and the element cannot be fitted into the base member in a predetermined posture. (B) The worker Since the groove portion cannot be visually recognized when the tip portion of the element is fitted into the groove, it takes a considerable amount of time to align the tip portion of the element with the annular groove, and (c) Since the gap with the strainer body is small, the operator can only hold the operation bar provided at the rear end of the element. Difficult more difficult to fit the end portion in the groove.

Further, as described above, the element is about 30 cm, about 1 m in length, and about 11 kg in weight, which is large and heavy. Therefore, there is a danger depending on the posture of the operator when the element is pushed in.
Thus, the installation work of the element of the strainer is a difficult work with danger as well as requiring a sufficient pushing force, technique and experience for the worker.

  As a result of intensive studies in order to solve the above-mentioned problems, the present inventors have obtained knowledge A and B listed below and completed the present invention.

  (A) Instead of a structure in which the tip of the element is fitted in a groove formed in the base member disposed in the pipe, the edge of the fluid inflow hole formed in the base member is substantially the same as the inner diameter of the element. A tubular projecting portion that fits the element is formed, and the tip portion of the projecting portion that faces the element is tapered so that the diameter of the projecting portion is reduced by pressing the element into the projecting portion. It functions as a centering guide that guides the element to be pushed into the specified mounting position, and the element is mechanically centered. Therefore, even if the insertion position of the element with respect to the main body of the strainer is not accurate, sufficient pushing force and technique for the operator , The element can be reliably and simply mounted at a predetermined mounting position without requiring experience.

  (B) Since the entire weight of the element can be pushed into the main body of the strainer, the mounting time can be shortened, the pushing force can be reduced, and the safety during pushing can be improved.

The present invention is listed below.
(1) A cylinder-shaped main body that is installed in communication with a pipe through which a fluid containing foreign substances flows, and a gap is formed between the main body and the fluid flowing through the pipe flows inside to trap foreign substances. Then, a strainer comprising a cylindrical element that is returned to the pipe and a base member that is disposed inside the pipe and supports the element at a predetermined mounting position,
The base member has an outer diameter substantially the same as the inner diameter of the element and includes a tubular protrusion that fits into the element.

  (2) The strainer described in the item (1), wherein an end of the protruding portion on the side facing the element is reduced in a tapered shape.

(3) A method of installing an element in the strainer described in (1) or (2),
A tubular projecting portion having an outer diameter substantially the same as the inner diameter of the element and fitting with the element is formed at the edge of the inflow hole in the base member, and the element is pushed into the projecting portion and fitted together. How to install the strainer element.

  According to the present invention, not only when the diameter of the strainer element is small, for example, even when the element is large and heavy, for example, the diameter is about 30 cm, the length is about 1 m, and the weight is about 11 kg. The element can be securely, easily and safely installed at a predetermined mounting position of the strainer body.

1A and 1B are explanatory views showing the installation state of the strainer according to the present invention in the vertical arrangement, in which FIG. 1A shows before the screen is pushed in, and FIG. 1B shows after the screen is pushed in. 2A and 2B are explanatory views showing the installation state of the strainer according to the present invention in the horizontal arrangement, in which FIG. 2A shows before the screen is pushed in, and FIG. 2B shows after the screen is pushed in.

  The present invention will be described with reference to the accompanying drawings. In the following description, the pipe is a large-diameter pipe (outer diameter 406.4 mm) used in a refrigerator of district heating and cooling equipment, the element is a screen made of a wire mesh, the strainer body and the screen diameter are Take as an example a case where the length is about 33 cm, the length of the element is about 1 m, and the weight is about 11 kg. In addition, the element in this invention is not limited to a screen (wire net), For example, well-known elements, such as a perforated plate and a gap | interval board, are applied equally.

  1A and 1B are explanatory views showing the installation state of the strainer 1 according to the present invention in the vertical arrangement, in which FIG. 1A shows before the screen 3 is pushed in, and FIG. 1B shows after the screen 3 is pushed in. .

As shown in FIG. 1 (a) and FIG. 1 (b), the strainer 1 according to the present invention includes a main body 2, a screen 3, and a base member 4, which will be sequentially described.
[Main unit 2]
The main body 2 has a cylindrical outer shape and is installed in communication with the pipe 5. As described above, the pipe 5 is a large-diameter pipe (outer diameter 406.4 mm) used in a refrigerator for district heating and cooling equipment. A fluid containing foreign matter such as dust and dirt flows.

Although not shown, a lid that closes the opening of the main body 2 is disposed on the main body 2.
For example, the main body 2 is made of bronze, lead-free bronze, gray cast iron, ductile cast iron, stainless steel, or the like, and may be appropriately selected in consideration of the type of fluid flowing in the steel pipe 5, the pressure, and the like. .

The main body 2 may be the same as the main body of this type of strainer, and since such a main body is well known to those skilled in the art, further description regarding the main body 2 is omitted.
[Screen 3]
As described above, the screen 3 is a cylindrical body made of, for example, a 10 to 80 mesh wire net, and is arranged with a gap formed between the screen 3 and the screen 3. The screen 3 flows the fluid flowing through the inside of the pipe 5 to the inside 3 a to capture foreign matter and return it to the pipe 5.

As described above, the screen 3 has a large and large weight of about 30 cm in diameter, about 1 m in element length, and about 11 kg in weight.
The screen 3 may be the same as this type of screen, and since such a screen is well known to those skilled in the art, further description regarding the screen 3 is omitted.

[Base member 4]
The base member 4 is a member for supporting the screen 3 at a predetermined mounting position in the main body 2, and is disposed by being appropriately fixed inside the pipe 5 by means (for example, welding). The base member 4 has an inflow hole 4a for fluid flowing through the pipe 5 inside thereof, so that the fluid in the pipe 5 can flow into the screen 3 and flow out from the screen 3. .

Further, the base member 4 is provided with a flow hole (not shown) for the fluid 5 so as not to block the pipe 5, and is configured not to obstruct the flow of the fluid in the pipe 5.
The base member 4 is made of, for example, a steel plate.

  The base member 4 includes a tubular protrusion 6. The protrusion 6 is formed in the vicinity of the edge of an inflow hole (not shown) in the base member 4. The protrusion 6 has an outer diameter that is substantially the same as the inner diameter of the screen 3 and can be fitted to the tip 3 b of the screen 3.

  As shown in FIGS. 1 (a) and 1 (b), the end portion 6a of the protruding portion 6 on the side facing the screen 3 may be tapered so that its diameter is reduced as a centering guide for the screen 3 to be pushed. It is preferable to improve the function.

  Thus, in the present invention, the tip 3b of the screen 3 is not pushed into the groove formed in the base member disposed inside the pipe 5 as in the prior art, but is formed in the base member 4. In the vicinity of the edge portion of the inflow hole 4a, a tubular projecting portion 6 having an outer diameter substantially the same as the inner diameter of the screen 3 and fitting with the screen 3 is formed, and preferably a tip portion of the projecting portion 6 facing the screen 3 6a is tapered to reduce the diameter, and the screen 3 is pushed into the projecting portion 6.

  Specifically, the operator forms the element 3 on the edge of the inflow hole 4a in the base member 4 and has a tubular protrusion having an outer diameter substantially the same as the inner diameter of the screen 3 and fitting with the screen 3. Push in 6 and fit.

  In the prior art, both the inner and outer surfaces of the screen 3 have a large pushing force for contacting the inner and outer walls of the groove. However, in the present invention, only the inner surface of the screen 3 is in contact with the outer surface of the protrusion 6. Since the outer surface of the screen 3 does not come into contact with the protruding portion 6, the screen 3 can be arranged at a predetermined mounting position with a pressing force smaller than that of the prior art by appropriately setting the outer diameter of the protruding portion 6.

  According to the present invention, since the screen 3 is mechanically centered by functioning as a centering guide for guiding the screen 3 into which the protrusion 6 is pushed into a predetermined mounting position, the strainer is exemplified as shown in FIG. Even if the insertion position of the screen 3 with respect to the main body 2 of 1 is not accurate, the screen 3 can be reliably and easily mounted at a predetermined mounting position without requiring a sufficient pushing force, technique and experience from the operator. Become.

  According to the present invention, since the position of the screen 3 is roughly regulated by the protrusion 6 immediately after the installation of the screen 3 is started, the operator pushes the entire weight of the screen 3 into the main body 2 of the strainer 1. Can do. For this reason, the mounting time can be shortened, the pushing force can be reduced, and the safety during pushing can be improved.

  Thus, according to the present invention, for example, a large-diameter pipe of a district heating and cooling facility, the diameter of the strainer body and the screen 3 is about 30 cm, the length of the screen 3 is about 1 m, and the weight is about 11 kg. Even in the case of the pipe 5, (a) if the operator does not have enough pushing force, the tip 3b of the screen 3 cannot be pushed completely into the groove, and the screen 3 is fitted into the base member 4 in a predetermined posture. (B) Since the operator cannot visually recognize the groove when the tip 3b of the screen 3 is fitted in the groove, this corresponds to matching the tip of the screen 3 with the annular groove. (C) Since the gap between the screen 3 and the main body 2 is small, the operator can only have an operation bar (not shown) provided at the rear end 3c of the screen 3. Never be combined, the distal end portion 3b of the screen 3 say that it is more difficult to fit into the groove, it is possible to solve the problems the prior art has.

The above description has been made by taking the case where the strainer 1 according to the present invention is vertically arranged as an example, but the same applies to the case where the strainer 1 is horizontally arranged.
2A and 2B are explanatory views showing the installation state of the strainer 1-1 according to the present invention in the horizontal arrangement. FIG. 2A shows the state before the screen 3 is pushed, and FIG. 2B shows the state after the screen 3 is pushed. Indicates.

  Since the situation in the horizontal arrangement is the same as that in the vertical arrangement, the description regarding FIG. 2 (a) and FIG. 2 (b) is omitted.

1,1-1 Strainer 2 according to the present invention 3 Body 3 Screen (element)
3a Internal 3b Front end 3c Rear end 4 Base member 4a Inflow hole 5 Pipe 6 Projection 6a End

The present invention is a cylindrical main body installed in communication with a pipe through which a fluid containing foreign matter flows;
A cylindrical element that is arranged with a gap between the main body and the fluid flowing through the pipe, and flows the fluid into the inside to capture the foreign matter and return the pipe to the pipe;
A strainer that is disposed inside the pipe and includes a base member that supports the element at a predetermined mounting position;
The base member has an outer diameter that is substantially the same as the inner diameter of the element and includes a tubular projecting portion that fits into the element, and an end portion of the projecting portion that faces the element has a tapered diameter. Strainer characterized by being made.

(2) A method of installing the element in the strainer described in (1) above,
A tubular tube having an outer diameter substantially the same as the inner diameter of the element at the edge of the inflow hole in the base member, and an end on the side facing the element that fits into the element having a tapered diameter. The strainer element installation method is characterized in that a projection portion is formed and the element is pushed into and fitted into the projection portion.

Claims (3)

A cylindrical body installed in communication with a pipe through which a fluid containing foreign matter flows;
A cylindrical element that is arranged with a gap between the main body and the fluid flowing through the pipe, and flows the fluid into the inside to capture the foreign matter and return the pipe to the pipe;
A strainer that is disposed inside the pipe and includes a base member that supports the element at a predetermined mounting position;
The said base member is provided with the tubular protrusion part which has an outer diameter substantially the same as the internal diameter of the said element, and fits the said element.   2. The strainer according to claim 1, wherein an end of the projecting portion on a side facing the element has a tapered diameter. A method for installing an element in a strainer according to claim 1 or claim 2,
A tubular projecting portion having an outer diameter substantially the same as the inner diameter of the element and fitting with the element is formed at the edge of the inflow hole in the base member, and the element is pushed into the projecting portion and fitted. Strainer element installation method characterized by matching.

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