JP2005172017A - Flow restricting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flow restricting device requiring a less number of parts and having good workability for arrangement in a flow path such as piping. <P>SOLUTION: The flow restricting device comprises a core member and a ring elastic member mounted in a piping member. The piping member has an inflow side opening portion having a larger diameter ranging from one end and a discharge side opening portion having a smaller diameter ranging from the other end, both of which are coaxial. A core member locking stepped portion and an elastic member placement stepped portion exist in a boundary area between the inflow side opening portion and the discharge side opening portion. The core member has a center core supported at the center of a ring flange portion by a supporting member and a plurality of protruded portions radially provided on the outer peripheral face of the center core. The core member is mounted in the piping member to lock the flange portion to the core member locking stepped portion. The ring elastic member is located in a space formed by the elastic member placement stepped portion in the piping member and the plurality of protruded portions of the center core. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a flow restriction device that enables a substantially constant outflow flow rate regardless of the level of fluid pressure.

Conventionally, a flow restricting member that is installed in a flow path such as a pipe and secures a substantially constant outflow rate from the low pressure to the high pressure of the upstream fluid has been a centralized boiler, tankless flush toilet, hotel It is used to control the maximum flow rate of faucets in public facilities. This flow restricting member is generally a fluid that flows into the inside of a cylindrical case and includes a core having an annular elastic member provided at a predetermined interval from the outer peripheral surface, and flows from one opening of the case. Flows out from the other opening through a space formed between the outer peripheral surface of the core and the elastic member, and at this time, the elastic member is deformed in accordance with the pressure of the flowing fluid to reduce the space area. Thus, the fluid flows out at a substantially constant flow rate regardless of changes in the fluid pressure flowing in (Patent Document 1).
Japanese Utility Model Publication No. 5-54875

However, the conventional flow restricting member requires a case, a core, and an annular elastic member, and there is a limit in improving durability and reducing manufacturing cost by reducing the number of parts. In addition, the conventional flow restricting member exhibits a function as a flow restricting device only after being disposed in a flow path such as a pipe, and the work of disposing the pipe in the flow path is complicated. There was also a problem.
The present invention has been made in view of such a situation, and an object of the present invention is to provide a flow restricting device that has a small number of parts and that is excellent in workability in arrangement in a flow path such as a pipe. .

  In order to achieve such an object, the present invention includes a piping member, a core member mounted in the piping member, and a ring-shaped elastic member, and the piping member has a large diameter from one end. And a discharge member opening having a small diameter from the other end on the same axis, and a step portion for engaging the core member and an elastic member at the boundary between the inflow opening and the discharge opening. The core member includes a center core supported by a support member at the center of a ring-shaped flange portion, and a plurality of convex portions provided radially on the outer peripheral surface of the center core. The flange portion is locked to and attached to a step portion for locking the core member in the piping member, and the ring-shaped elastic member is a step portion for mounting the elastic member in the piping member. And a space formed by the plurality of convex portions of the center core It was constructed.

As a preferred aspect of the present invention, the piping member has a threaded portion on the outer wall surface and / or the inner wall surface at both ends.
As a preferred aspect of the present invention, a configuration in which the plurality of convex portions of the center core have the same shape, or the plurality of convex portions of the center core have two or more shapes, and the axis of the center core The convex portions at the symmetric positions have the same shape.
As a preferable aspect of the present invention, the center core includes a protruding portion that protrudes in the direction of the discharge side opening of the piping member.

  In the present invention, the flow restricting device can be easily arranged in the flow path simply by connecting the piping member to a desired pipe or the like, and the complicated work of arranging the flow restricting member in the conventional pipe is unnecessary. In addition, since the parts are only the pipe member, the core member, and the ring-shaped elastic member, and the pipe member can be incorporated as a part of the pipe as it is, only the core member and the ring-shaped elastic member are used as the mounting parts. There is a reduction in the number of parts, which makes it possible to reduce manufacturing costs and improve durability.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing an embodiment of the flow restriction device of the present invention. In FIG. 1, a flow restriction device 1 of the present invention includes a piping member 11, a core member 21 mounted in the piping member 11, and a ring-shaped elastic member 31. FIG. 2 is a plan view showing an example of a core member constituting the flow restriction device of the present invention. In FIG. 1, the fluid flows in the direction of the arrow, and FIG. 2 is a plan view of the core member from the upstream side.

  The piping member 11 constituting the flow restriction device 1 has a cylindrical inflow side opening 12 on one end 11a side, and a cylindrical discharge side opening 13 on the other end 11b side on the same axis. Have. As for the opening diameter of the inflow side opening 12 and the opening diameter of the discharge side opening 13, the inflow side opening 12 has a larger diameter, and an inner wall surface corresponding to a boundary portion with the small diameter discharge side opening 13. Has a step 14 for locking the core member and a step 15 for mounting the elastic member. The size relationship between the opening diameter of the inflow side opening 12 and the opening diameter of the discharge side opening 13 is not limited to the illustrated example, and may be equal, and the inflow side opening 12 has a smaller diameter. May be.

The outer diameter dimension of the piping member 11 can be set as appropriate according to the application of the flow restriction device 1, for example, by conforming to the piping dimensions of JIS. Thereby, the flow restriction device 1 of the present invention can be incorporated into a desired pipe as a part thereof. In addition, the diameter D1 of the inflow side opening 12 and the diameter D2 of the discharge side opening 13 in the piping member 11 are, for example, from 1 to 30 mm and D2 from 3 to 30 mm, as described later. The difference in level that can be formed within a suitable range can be set.
Further, the length L1 of the inflow side opening 12 of the piping member 11, the length L2 of the discharge side opening 13, and the length of the piping member 11 which is the sum of these lengths depend on the use of the flow restriction device 1 and the like. For example, L1 can be set as appropriate from the range of 1 to 100 mm, and L2 can be set as appropriate from the range of 3 to 100 mm.

Further, the step portion 14 for locking the core member is for locking a ring-shaped flange portion 22 of the core member 21 to be described later, and the width W1 of the flat surface corresponds to the width of the flange portion 22. It can be set appropriately. The step 15 for mounting the elastic member is for mounting the ring-shaped elastic member 31. The depth d of the step and the width W2 of the flat surface are the same as the thickness of the ring-shaped elastic member 31. In consideration of the dimensions of the core member 21 and the like, the flow path 28 described later can be appropriately set so as to ensure an appropriate size.
Moreover, the piping member 11 is equipped with the screw parts 16 and 17 in the outer wall surface of both ends (11a, 11b), and, thereby, the piping member 11 can be easily connected as a part of desired piping. In addition, the piping member 11 may be provided with a screw part on the inner wall surface at both ends, or may be provided with a screw part on the outer wall surface of one end and the inner wall surface of the other end.

Examples of the material of the piping member 11 include metals such as iron, stainless steel, and brass, POM (polyacetal), PET (polyethylene terephthalate), fluorine-based resin, PPS (polyphenylene sulfide), PSU (polysulfone), and vinyl chloride. The resin can be selected.
The core member 21 constituting the flow restriction device 1 has a ring-shaped flange portion 22 and a center core 23 located at the center of the flange portion 22, and the center core 23 is plural (four in the illustrated example). It is supported by the flange portion 22 via the support member 24. A through hole 27 is provided between the flange portion 22 and the center core 23. A plurality of convex portions 25 are provided radially on the outer peripheral surface of the center core 23.

The flange portion 22 has a flat ring shape, and the core member 21 is mounted in the piping member 11 by being locked to the step portion 14 for locking the core member in the piping member 11 described above. The flange portion 22 is locked to the stepped portion 14 by, for example, a method in which the outer shape of the flange portion 22 is set slightly larger than the diameter D1 of the inflow side opening 12 of the piping member 11 and the core member 21 is press-fitted. A method of fitting a retaining ring to the inflow side opening 12 so as to fix the flange portion 22 in a state where the flange portion 22 is in contact with the stepped portion 14 can be performed.
The center core 23 has a circular outer peripheral surface (indicated by a chain line in FIG. 2), and a plurality of (16) convex portions 25 having the same shape are provided radially at equal intervals on the outer peripheral surface. A recess 26 is formed between the portions 25. The center core 23 includes a protruding portion 23 a that protrudes in the direction of the discharge-side opening 13 of the piping member 11 and a groove 23 b that is provided on the inflow-side opening 12 side of the piping member 11.

  The diameter D3 of the center core 23 and the height h of the convex portion 25 can be set within a range in which the relational expression (D3 + 2 × h) ≦ D2 is satisfied in consideration of the diameter D2 of the discharge side opening 13 described above. . Further, the shape of the convex portion 25 determines the shape of the concave portion 26 together with the diameter D3 of the center core 23 and the height h of the convex portion 25, and therefore determines the size of the flow path 28 described later. Therefore, it is appropriately set in consideration of the application (type of fluid, target outflow rate) of the flow restriction device 1 and the like. However, the diameter D2 in the above relational expression means a diameter at a portion where the convex portion 25 of the center core 23 is located. Therefore, it is also possible to set the diameter D2 at the end 11b of the piping member 11 to be different from the diameter D2 at the portion where the convex portion 25 of the center core 23 is located.

In the illustrated example, the plurality of convex portions 25 have the same shape and dimensions, but the present invention is not limited to this, and the convex portions 25 may have two or more shapes. However, it is preferable that the convex portions at symmetrical positions via the axis of the center core 23 have the same shape and size. Moreover, the number of the convex parts 25 can also be set suitably.
Such a core member 21 can be formed using resin materials such as polyacetal resin, polypropylene resin, vinyl chloride resin, PPS (polyphenylene sulfide), and PSU (polysulfone).

  The ring-shaped elastic member 31 constituting the flow restriction device 1 is, for example, a rubber material such as EPDM (ethylene-propylene rubber), NBR (acrylonitrile-butadiene rubber), fluorine rubber, silicone rubber, styrene, olefin An O-ring made of a thermoplastic elastomer such as vinyl chloride, urethane, ester, amide, or fluorine can be used. The material to be used, the thickness of the elastic member 31, and the like can be appropriately set in consideration of the application (type of fluid, target outflow flow rate) of the flow restriction device 1 and the like. Such an elastic member 31 is located in a space formed between the step portion 15 for placing the elastic member in the piping member 11 and the plurality of convex portions 25 of the center core 23 (see FIG. 2). The elastic member 31 is indicated by a two-dot chain line). A gap portion between the elastic member 31 and the outer peripheral surface of the center core 23 (including the convex portion 25) serves as the flow path 28.

  The flow restriction device 1 of the present invention as described above can easily arrange the flow restriction device in the flow path by incorporating the piping member 11 into a desired pipe as a part thereof. In this flow restriction device 1, the fluid that flows in from the inflow side opening 12 of the piping member 11 toward the core member 21 flows through the flow path 28 to the discharge side opening 13. When the pressure on the upstream side of the fluid increases, the elastic member 31 is deformed and pressed against the convex portion 25 of the center core 23 as shown in FIG. Narrow. The change in the flow path 28 becomes narrower as the fluid pressure increases, and as a result, a substantially constant outflow rate is obtained at the discharge side opening 13 regardless of the level of the fluid pressure.

  The above-described embodiment is an example, and the present invention is not limited to this. For example, instead of the above-described screw portion, other pipe connecting means may be added to the pipe member 11 or processed.

  It can be used for general applications of simple flow rate restriction of water and other fluids (including gas).

It is sectional drawing which shows one Embodiment of the flow restriction | limiting device of this invention. It is a top view which shows an example of the core member which comprises the flow volume control apparatus of this invention. It is a top view equivalent to FIG. 2 for demonstrating the deformation | transformation state of the ring-shaped elastic member which comprises the flow volume control apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Flow control device 11 ... Piping member 12 ... Inflow side opening part 13 ... Discharge side opening part 14 ... Step part for core member latching 15 ... Step part for elastic member mounting 16, 17 ... Screw part 21 ... Core Member 22 ... Flange part 23 ... Center core 24 ... Support member 25 ... Convex part 28 ... Flow path 31 ... Ring-shaped elastic member

Claims (5)

A piping member, and a core member and a ring-shaped elastic member mounted in the piping member,
The piping member coaxially has a large-diameter inflow side opening from one end and a small-diameter discharge side opening from the other end, and a boundary portion between the inflow side opening and the discharge side opening. A step portion for locking the core member and a step portion for placing the elastic member,
The core member includes a center core supported by a support member at the center of a ring-shaped flange portion, and a plurality of convex portions provided radially on the outer peripheral surface of the center core, and the piping includes the pipe Locked and attached to the stepped portion for locking the core member in the member,
The flow restricting device according to claim 1, wherein the ring-shaped elastic member is located in a space formed by a step portion for mounting the elastic member in the piping member and a plurality of convex portions of the center core.   The flow restricting device according to claim 1, wherein the piping member has screw portions on outer wall surfaces and / or inner wall surfaces at both ends.   The flow restriction device according to claim 1, wherein the plurality of convex portions of the center core have the same shape.   The plurality of convex portions of the center core have two or more shapes, and the convex portions at symmetrical positions via the axis of the center core have the same shape. Flow restriction device.   The flow restriction device according to any one of claims 1 to 4, wherein the center core includes a protruding portion that protrudes toward the discharge-side opening of the piping member.

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