JP2020034060A - Float type non-return valve - Google Patents

Abstract

To attach or detach a valve mechanism easily.SOLUTION: A float type non-return valve 1 includes: a cylindrical holding member 10 which is fixed to an installation object and in which a liquid circulates; and a valve mechanism 20 having a valve seat 21 having a liquid flow hole 21a, a float 25 which is provided at the downstream side of the valve seat 21 and is seated on or separates from the valve seat 21 to open or close the liquid flow hole 21a, and a housing part 30 in which the float 25 is housed, the valve mechanism 20 provided at an interior of the holding member 10. The float type non-return valve 1 is configured so that the valve mechanism 20 is attached to or detached from an interior of the holding member 10 by rotating the valve mechanism 20.SELECTED DRAWING: Figure 1

Description

  The present application relates to a float check valve.

  A float check valve provided in a drain pipe or a drain port is known. For example, Patent Document 1 discloses a float check valve provided in a drain pipe of a drain funnel. This float check valve is provided with a valve mechanism having a valve seat, a float for opening and closing a flow hole of the valve seat, an accommodation portion for accommodating the float, and the like. This valve mechanism is inserted into a drain pipe, and the upper side is fixed to the bottom of the casing (the installation surface of the drain pipe) with bolts. As described above, since the valve mechanism is fixed by the bolts, the valve mechanism can be easily taken out from the drain pipe. That is, maintenance of the valve mechanism (particularly, the valve seat and the float) is easy.

JP 2013-185386 A

  However, in the above-described float check valve, it is necessary to remove several bolts when removing the valve mechanism, which is troublesome.

  The technology disclosed in the present application has been made in view of such circumstances, and an object thereof is to provide a float check valve in which a valve mechanism can be easily attached and detached.

  The float check valve of the present application includes a cylindrical holding member and a valve mechanism. The holding member is fixed to the installation target portion, and the liquid flows through the inside. The valve mechanism has a valve seat, a float, and a housing, and is provided inside the holding member. The valve seat has a liquid flow hole. The float is provided on the downstream side of the valve seat, and separates from the valve seat to open and close the communication hole. The housing section houses the float. The float check valve according to the present application is configured such that the valve mechanism is attached to and detached from the holding member by rotating the valve mechanism.

  According to the float check valve of the present application, the valve mechanism can be easily attached and detached.

FIG. 1 is a cross-sectional view illustrating a schematic configuration of the float check valve according to the first embodiment. FIG. 2 is a sectional view illustrating a schematic configuration of the valve mechanism according to the first embodiment. FIG. 3 is a sectional view illustrating a schematic configuration of the holding member according to the first embodiment. FIG. 4 is a plan view showing the float check valve according to the first embodiment as viewed from above. FIG. 5 is a diagram illustrating the float check valve according to the first embodiment as viewed from below. FIG. 6 is a cross-sectional view illustrating a schematic configuration of a float check valve according to the second embodiment. FIG. 7 is a cross-sectional view illustrating a schematic configuration of a valve mechanism according to the second embodiment. FIG. 8 is a plan view showing the float check valve according to the second embodiment as viewed from above. FIG. 9 is a diagram illustrating the float check valve according to the second embodiment as viewed from below.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the following embodiments are essentially preferred examples, and are not intended to limit the scope of the technology disclosed in the present application, its application, or its use.

(Embodiment 1)
Embodiment 1 of the present application will be described with reference to FIGS. The float check valve 1 of the present embodiment (hereinafter, also simply referred to as the check valve 1) is a drain port 102 (hereinafter, referred to as an installation surface 101) provided on the ground or a floor of a factory or the like. Or drain outlet). Liquid such as contaminated water that has spilled or been discharged to the installation surface 101 is discharged from the liquid discharge port 102.

  The check valve 1 according to the present embodiment is provided inside the drain port 102, and allows a liquid flow from the upstream side (the installation surface 101 side), but prevents a liquid flow (backflow) from the downstream side. I do. In FIG. 1, the upper side is the upstream side and the lower side is the downstream side. That is, in the present embodiment, the upstream and downstream directions coincide with the vertical direction. The check valve 1 includes a holding member 10 and a valve mechanism 20.

  The holding member 10 is fixed to the drain port 102 as an installation target portion, and is formed in a cylindrical shape through which liquid flows. The holding member 10 is provided with the center axis extending in the upstream and downstream directions. The holding member 10 is inserted into the circular drain port 102 and is fixed to the drain port 102 by, for example, an adhesive.

  The holding member 10 is inserted into the drain port 102 such that the upper end 13 that is the upstream end is flush with the installation surface 101. As shown in FIG. 3, the holding member 10 has a large-diameter portion 11 and a small-diameter portion 12 formed in order from the upstream side. The inner diameter of the large diameter part 11 is larger than the inner diameter of the small diameter part 12.

  As shown in FIG. 2, the valve mechanism 20 includes a valve seat 21, a mounting member 22, a holding member 23, a float 25, and a housing 30. The valve mechanism 20 is provided inside the holding member 10.

  The valve seat 21 is an annular plate member and has a liquid flow hole 21a. The valve seat 21 is formed of, for example, a resin-based material. The valve seat 21 is provided with the central axis extending in the upstream and downstream directions.

  The attachment member 22 is formed in a column shape whose center axis extends in the upstream and downstream directions. The valve seat 21 is attached to the attachment member 22 at the downstream end. At the center of the mounting member 22, a liquid inflow hole 22a penetrating in the upstream and downstream directions and communicating with the flow hole 21a of the valve seat 21 is provided. The inflow hole 22a is provided coaxially with the flow hole 21a. On the lower surface (downstream side surface) of the mounting member 22, there is provided an annular step portion 22b in which the edge of the inflow hole 22a is concave. The valve seat 21 is fitted into the step 22b.

  The holding member 23 is an annular plate member and is made of, for example, metal. The holding member 23 is provided in a state where the central axis extends in the upstream and downstream directions. The holding member 23 is attached to the lower surface of the mounting member 22, and holds the valve seat 21 with the mounting member 22. The outer diameter of the holding member 23 is the same as the outer diameter of the mounting member 22. The inner diameter of the holding member 23 is slightly larger than the inner diameter of the valve seat 21 (that is, the flow hole 21a).

  The float 25 is formed in a spherical shape, and is made of, for example, metal. The float 25 is provided below (downstream side) the valve seat 21. The float 25 is a valve body that detaches and seats on the valve seat 21 to open and close the communication hole 21a. In other words, the float 25 opens the communication hole 21 a by separating from the valve seat 21, and closes the communication hole 21 a by sitting on the valve seat 21. The float 25 is configured to rise by the flow of the liquid and to sit on the valve seat 21 when the liquid flows backward from the downstream side.

  The housing section 30 is provided below (downstream side) the valve seat 21 and houses the float 25 in a vertically movable manner. The housing section 30 has a plurality of (four in the present embodiment) shaft members 31 and a bottom plate 33.

  The plurality of shaft members 31 are provided around the float 25. The shaft member 31 extends in the upstream and downstream directions. The shaft member 31 has a circular portion 31a, a polygonal portion 31c, and a circular portion 31b formed in this order from the upstream end. The circular sections 31a and 31b have a circular cross section. The polygonal section 31c has a polygonal cross section (hexagon in this embodiment). The polygonal portion 31c has a larger outer size than the circular portions 31a and 31b.

  In the shaft member 31, the upstream circular portion 31 a penetrates the holding member 23 and the mounting member 22, and the end surface of the polygonal portion 31 c contacts the holding member 23. A nut 32 is fastened to the upper end of the penetrated circular portion 31a. That is, the holding member 23 is fixed to the mounting member 22 by the shaft member 31 and the nut 32. The mounting member 22 and the holding member 23 are held between the polygonal portion 31 c of the shaft member 31 and the nut 32.

  The bottom plate 33 is provided at a downstream end (lower end) of the plurality of shaft members 31. Specifically, in the shaft member 31, the downstream circular portion 31b penetrates the bottom plate 33, and the end surface of the polygonal portion 31c is in contact with the upper surface of the bottom plate 33. A nut 32 is fastened to the lower end of the penetrated circular portion 31b. That is, the bottom plate 33 is fixed by the shaft member 31 and the nut 32.

  The float 25 is housed inside the plurality of shaft members 31 and the bottom plate 33 thus arranged. The bottom plate 33 defines a lower limit position of the float 25. As shown in FIG. 5, a circular through hole 33a is provided in the center of the bottom plate 33. The hole diameter of the through hole 33a is smaller than the outer diameter of the float 25. The through-hole 33a is a hole into which a part of the float 25 that has descended enters. That is, the through-hole 33a is a hole in which the lowered float 25 is seated.

  The check valve 1 is configured such that the valve mechanism 20 is attached to and detached from the holding member 10 by rotating the valve mechanism 20.

  Specifically, the mounting member 22 has a male screw portion 22c provided on the outer peripheral surface. The holding member 10 has a female screw portion 15 that is provided on the inner peripheral surface and that is screwed with the male screw portion 22c by rotating the valve mechanism 20. More specifically, the female screw part 15 is provided on the inner peripheral surface of the large diameter part 11 of the holding member 10. Thus, the valve mechanism 20 is attached to the inside of the holding member 10 by rotating the valve mechanism 20 to screw the male screw portion 22c and the female screw portion 15 together.

  The inflow hole 22a of the attachment member 22 also serves as an insertion hole of a tool for rotating the valve mechanism 20 by inserting and rotating. As shown in FIG. 4, the inflow hole 22a is formed in a polygonal shape (a hexagonal shape in the present embodiment) in plan view. By inserting a tool (in this embodiment, a hexagon wrench (also referred to as a hexagon wrench)) into the inflow hole 22a and rotating the tool, the valve mechanism 20 is rotated. Thus, by rotating the valve mechanism 20, the valve mechanism 20 can be attached to and detached from the holding member 10.

  An O-ring 18 is provided on the large diameter portion 11 of the holding member 10. Specifically, a groove 17 is formed in the inner peripheral surface of the large-diameter portion 11 in the circumferential direction, and an O-ring 18 is fitted into the groove 17. The O-ring 18 is in contact with the outer peripheral surface of the holding member 23 in the valve mechanism 20. As a result, the space between the inner peripheral surface of the holding member 10 and the valve mechanism 20 is sealed by the O-ring 18.

  On the inner peripheral surface of the holding member 10, there is provided a step 16 for positioning the valve mechanism 20 in the upstream and downstream directions (up and down directions). The step portion 16 is a step formed at a boundary between the inner peripheral surface of the large diameter portion 11 and the inner peripheral surface of the small diameter portion 12. The valve mechanism 20 is positioned in the upstream and downstream directions by the lower surface of the holding member 23 being in contact with the step 16. In the present embodiment, the length of the female screw portion 15 (length in the upstream / downstream direction) may be defined to perform positioning in the upstream / downstream direction of the valve mechanism 20.

  As shown in FIG. 1, the valve mechanism 20 is provided inside the holding member 10 so as not to protrude from the upper end 13 which is the upstream end of the holding member 10. That is, the valve mechanism 20 is provided so as not to protrude upward from the installation surface 101. Further, the valve mechanism 20 is provided inside the holding member 10 so as not to protrude from the lower end 14 which is the downstream end of the holding member 10. That is, the entire valve mechanism 20 is housed inside the holding member 10.

  In the check valve 1 configured as described above, when there is no liquid flow, or when liquid flows in from the upstream side, the float 25 is lowered to the bottom plate 33 (the state shown by the solid line in FIG. 1). Become. That is, the flow hole 21a is in an open state. Therefore, the liquid on the upstream side flows in from the inflow hole 22a and is discharged to the downstream side through the flow hole 21a. On the other hand, when the liquid flows backward from the downstream side, the float 25 rises by the flow of the liquid and sits on the valve seat 21 (the state shown by the two-dot chain line in FIG. 1). As a result, the flow hole 21a is closed, so that backflow of the liquid is prevented.

  As described above, the check valve 1 of the above embodiment is configured such that the valve mechanism 20 is attached to and detached from the holding member 10 by rotating the valve mechanism 20. Specifically, the mounting member 22 has a male screw portion 22c provided on the outer peripheral surface. The holding member 10 has a female screw portion 15 that is provided on the inner peripheral surface and that is screwed with the male screw portion 22c by rotating the valve mechanism 20.

  According to the above configuration, since the valve mechanism 20 is detachably provided to the holding member 10, maintenance of the valve mechanism 20 (particularly, the valve seat 21 and the float 25) is facilitated. Moreover, since it is only necessary to rotate the valve mechanism 20, the valve mechanism 20 can be easily attached and detached.

  In the check valve 1 of the above embodiment, the inflow hole 22a of the mounting member 22 also serves as an insertion hole of a tool for rotating the valve mechanism 20 by inserting and rotating. According to this configuration, there is no need to separately provide a tool insertion hole for rotating the valve mechanism 20. Therefore, the size of the check valve 1 can be reduced.

  In the check valve 1 of the above-described embodiment, the housing portion 30 includes a plurality of shaft members 31 provided around the float 25 and extending in the upstream and downstream directions. Therefore, the liquid can flow from between the shaft members 31 while the float 25 is housed. Therefore, the amount of discharged liquid can be increased.

  In the check valve 1 of the above embodiment, the valve mechanism 20 is provided inside the holding member 10 so as not to protrude from the upper end which is the upstream end of the holding member 10. Therefore, when the holding member 10 is provided such that the upper end 13 of the holding member 10 is flush with the installation surface 101, it is possible to prevent the valve mechanism 20 from projecting from the installation surface 101. Thus, for example, the valve mechanism 20 can be prevented from becoming an obstacle to the pipes and wiring laid on the installation surface 101.

  In the check valve 1 of the above embodiment, the inflow hole 22a of the mounting member 22 is formed in a polygonal shape in plan view. Therefore, the valve mechanism 20 can be rotated by a small and lightweight general-purpose tool such as a hexagon wrench. Therefore, the valve mechanism 20 can be more easily attached and detached.

(Embodiment 2)
Embodiment 2 of the present application will be described with reference to FIGS. The float check valve 1 of the present embodiment is obtained by changing the configuration of the valve mechanism in the first embodiment. Here, differences from the first embodiment will be described.

  As shown in FIG. 6, the check valve 1 of the present embodiment includes a holding member 10 and a valve mechanism 40. The configuration of the holding member 10 is the same as that of the first embodiment. As shown in FIG. 7, the valve mechanism 40 has a valve seat 41, a mounting member 42, a holding member 43, a float 46, and a housing 50. The valve mechanism 40 is provided inside the holding member 10.

  The valve seat 41 is an annular plate member and has a liquid flow hole 41a. The valve seat 41 is formed of, for example, a resin-based material. The valve seat 41 is provided in a state where the central axis extends in the upstream and downstream directions.

  The mounting member 42 is formed in a columnar shape whose central axis extends in the upstream and downstream directions. The valve seat 41 is attached to the downstream end of the attachment member 42. At the center of the mounting member 42, a liquid inflow hole 42a penetrating in the upstream and downstream directions and communicating with the flow hole 41a of the valve seat 41 is provided. The inflow hole 42a is provided coaxially with the flow hole 41a. On the lower surface (downstream side surface) of the mounting member 42, there is provided an annular step portion 42b in which the edge of the inflow hole 42a is concave.

  The step portion 42b is provided with a valve seat 41 and a holding member 43. The holding member 43 is an annular member and is made of, for example, metal. The holding member 43 is provided in a state where the central axis extends in the upstream and downstream directions. The holding member 43 is fixed to the mounting member 42 by a screw 44. The attachment member 42 has a screw hole 42d into which the screw 44 is inserted. Note that the inner diameter of the holding member 43 is slightly larger than the inner diameter of the valve seat 41 (that is, the flow hole 41a).

  The float 46 is configured similarly to the first embodiment. That is, the float 46 is formed in a spherical shape, and is provided below (downstream side) the valve seat 41. The float 46 is attached to and detached from the valve seat 41 to open and close the communication hole 41a. The float 46 is configured to rise by the flow of the liquid and to sit on the valve seat 41 when the liquid flows backward from the downstream side.

  The housing portion 50 is provided below (downstream side) the valve seat 41 and houses the float 46 so as to be vertically movable. The accommodation section 50 has a cylindrical member 51 and a bottom plate 52.

  The cylindrical member 51 is provided around the float 46. That is, the float 46 is provided inside the cylindrical member 51. The cylindrical member 51 extends in the upstream and downstream directions. In the peripheral wall of the cylindrical member 51, a through hole 51a penetrating inside and outside is provided. A plurality of the through holes 51a are provided in the circumferential direction of the cylindrical member 51. The through-hole 51a is a hole through which the liquid flows. The cylindrical member 51 is formed integrally with the mounting member 42. That is, the upper end, which is the upstream end of the cylindrical member 51, is connected to the lower surface of the mounting member 42.

  The bottom plate 52 is provided at a downstream end (lower end) of the cylindrical member 51. The bottom plate 52 is fixed to the cylindrical member 51 by a snap ring 53. The float 46 is housed inside the cylindrical member 51 and the bottom plate 52 thus arranged. The bottom plate 52 defines a lower limit position of the float 46. As shown in FIG. 9, a plurality of (four in the present embodiment) through holes 52 a are provided in the bottom plate 52. This through hole 52a is a hole through which the liquid flows.

  The check valve 1 of the present embodiment is also configured such that the valve mechanism 40 is attached to and detached from the holding member 10 by rotating the valve mechanism 40, as in the first embodiment. That is, the mounting member 42 has the male screw portion 42c provided on the outer peripheral surface. Then, the valve mechanism 40 is attached to the inside of the holding member 10 by rotating the valve mechanism 40 to screw the male screw portion 42c and the female screw portion 15 of the holding member 10 together.

  Also in the present embodiment, the inflow hole 42a of the attachment member 42 doubles as an insertion hole of a tool for rotating the valve mechanism 40 by inserting and rotating. As shown in FIG. 8, the inflow hole 42a is formed in a polygonal shape (a hexagonal shape in the present embodiment) in plan view.

  As in the first embodiment, a step 16 for positioning the valve mechanism 40 in the upstream and downstream directions (up and down directions) is provided on the inner peripheral surface of the holding member 10. As shown in FIG. 6, the valve mechanism 40 is positioned in the upstream and downstream directions by the lower surface of the mounting member 42 being in contact with the step 16. Note that, in the present embodiment as well, the length of the female screw portion 15 (the length in the upstream and downstream directions) may be defined so that the valve mechanism 40 is positioned in the upstream and downstream directions.

  As shown in FIG. 6, also in the present embodiment, the valve mechanism 40 is provided inside the holding member 10 so as not to protrude from the upper end 13 which is the upstream end of the holding member 10. Further, the valve mechanism 40 is provided inside the holding member 10 so as not to protrude from the lower end 14 which is the downstream end of the holding member 10.

  As described above, also in the check valve 1 of the present embodiment, the same operation and effect as those of the first embodiment are exerted.

(Other embodiments)
The technology disclosed in the present application may have the following configuration in the check valve 1 of the above embodiment.

  For example, in the above embodiment, the female mechanisms 15 and the male threads 22c and 42c that are screwed together are provided as a configuration in which the valve mechanisms 20 and 40 are attached to and detached from the holding member 10 by rotating the valve mechanisms 20 and 40. However, the following may be used instead. By rotating the valve mechanism, a projection and a slit that mesh with each other may be provided. That is, for example, one of the inner peripheral surface of the holding member and the outer peripheral surface of the mounting member is provided with a slit extending in the circumferential direction, and the other is provided with a projection.

  Further, in the above embodiment, the shape of the inflow hole of the attachment member may be a polygon other than a hexagon, or may be an ellipse. That is, when the inflow hole is also used as a tool insertion hole, the shape of the inflow hole may be any shape as long as a tool can be inserted to rotate the valve mechanism.

  When the inflow hole of the mounting member is not used as the insertion hole of the tool, the shape of the inflow hole may be circular.

  As described above, the technology disclosed in the present application is useful for a float check valve.

Reference Signs List 1 float type check valve 10 holding member 13 upper end 15 female screw part 20, 40 valve mechanism 21, 41 valve seat 21a, 41a flow hole 22, 42 mounting member 22a, 42a inflow hole 22c, 42c male screw part 25, 46 float 30, 50 accommodation portion 31 shaft member 33, 52 bottom plate 51 cylindrical member

Claims (7)

A cylindrical holding member fixed to the installation target portion and through which liquid flows,
A valve seat having a liquid flow hole, a float provided on the downstream side of the valve seat, detachably seated on the valve seat to open and close the flow hole, and a storage portion in which the float is stored; And a valve mechanism provided inside the
A float type check valve, wherein the valve mechanism is configured to be attached to and detached from the holding member by rotating the valve mechanism. The float check valve according to claim 1,
The valve mechanism is formed in a cylindrical shape having a central axis extending in the upstream and downstream directions, and the valve seat is attached to a downstream end, and an inflow hole for liquid penetrating in the upstream and downstream directions and communicating with the flow hole is provided. Having a mounting member provided,
The mounting member has a male screw portion provided on an outer peripheral surface,
The float type check valve, wherein the holding member has an internal thread portion which is provided on an inner peripheral surface and is screwed with the external thread portion by rotating the valve mechanism. The float check valve according to claim 1 or 2,
The inflow hole of the mounting member also serves as an insertion hole of a tool for rotating the valve mechanism by being inserted and rotated, and is a float type check valve. The float check valve according to claim 2,
The upstream and downstream directions coincide with the vertical direction,
The float is provided below the valve seat,
The accommodating section,
A plurality of shaft members provided around the float and extending in the upstream and downstream directions,
A float check valve provided at a downstream end of each of the plurality of shaft members, the bottom plate defining a lower limit position of the float. The float check valve according to claim 2,
The upstream and downstream directions coincide with the vertical direction,
The float is provided below the valve seat,
The accommodating section,
A cylindrical member provided around the float, formed in a cylindrical shape extending in the upstream and downstream directions, and provided with a through hole penetrating the inside and outside of the peripheral wall,
A float check valve provided at a downstream end of the cylindrical member to regulate a lower limit position of the float. The float check valve according to claim 2,
The upstream and downstream directions coincide with the vertical direction,
The float type check valve, wherein the valve mechanism is provided inside the holding member so as not to protrude from an upper end which is an upstream end of the holding member. The float check valve according to claim 3,
The float type check valve, wherein the inflow hole of the attachment member is formed in a polygonal shape in a plan view.

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