JP2020067136A - Float type check valve - Google Patents

Abstract

To improve valve closure performance.SOLUTION: A float type check valve 1 comprises: a casing 10 which has a cylindrical shape extended in a vertical direction and has a bottom wall 13 with a fluid outflow hole 15 provided thereon; a valve seat member 30 provided with a cylindrical section 31 which is protruded from an inner face 13a of the bottom wall 13 with an interior space thereof communicated with the fluid outflow hole 15; and a float 41 which is installed inside the casing 10, closes the fluid outflow hole 15 by being brought into contact with an upper end of the cylindrical section 31 and opens the fluid outflow hole 15 by being floated with the fluid flowing into the casing 10 from an upper section thereof. The cylindrical section 31 has a lateral hole 36 communicating an outside with an inside thereof.SELECTED DRAWING: Figure 1

Description

  The present application relates to a float check valve.

  For example, Patent Document 1 discloses a float check valve in which a float is provided above a valve seat member. This float check valve includes a tubular casing having a valve seat member (water passage piece) provided in the lower portion. In the valve seat member, the portion of the flow hole (water passage hole portion) projects upward. Inside the casing, there are provided a float located above the valve seat member, and a guide portion (guide cylinder) located around the float and guiding the vertical movement of the float.

Japanese Utility Model Publication No. 52-3057

  By the way, in the above-described float type check valve, the upstream and downstream directions may be reversed, that is, the upper side may be used as the upstream side and the lower side may be used as the downstream side. In that case, when the liquid flows in from the upstream side, the float floats by the liquid and the liquid is discharged from the circulation hole to the downstream side. Then, when the liquid does not flow in from the upstream side, the liquid level in the casing gradually decreases, and the float descends as the liquid level decreases.

  Here, since the valve seat member projects upward, the liquid level in the casing does not drop below the opening position of the circulation hole, and the liquid is accumulated around the circulation hole. Then, it becomes difficult for the float to sit on the valve seat member. Therefore, the valve closing performance may be deteriorated.

  The technique disclosed in the present application has been made in view of such circumstances, and an object thereof is to improve valve closing performance.

  The float check valve of the present application includes a casing, a valve seat member, and a float. The casing is formed in a cylindrical shape extending in the vertical direction and has a bottom wall provided with a liquid outflow hole. The valve seat member has a cylindrical portion that is provided so as to project from the inner surface of the bottom wall and the inside of which communicates with the outflow hole. The float is housed in the casing and is seated on the upper end of the cylindrical portion to close the outflow hole. Further, the float floats by the liquid flowing from the upper part of the casing and opens the outflow hole. Then, the cylindrical portion is provided with a lateral hole penetrating inside and outside.

  According to the float check valve of the present application, the valve closing performance can be improved.

FIG. 1 is a cross-sectional view showing a schematic configuration of a float check valve according to an embodiment. FIG. 2 is a plan view showing a schematic configuration of the lid according to the embodiment. FIG. 3 is a sectional view showing a main part of the valve seat member according to the embodiment. FIG. 4 is a cross-sectional view showing a schematic configuration of the float unit according to the embodiment. FIG. 5 is a plan view showing the upper plate of the float unit according to the embodiment. FIG. 6 is a sectional view showing a main part of a valve seat member according to another embodiment.

  Hereinafter, embodiments of the present application will be described with reference to the drawings. The following embodiments are essentially preferable exemplifications, and are not intended to limit the scope of the technology disclosed in the present application, its application, or its application.

  As shown in FIG. 1, a float check valve 1 (hereinafter, also simply referred to as check valve 1) of the present embodiment is provided on a floor surface (hereinafter, referred to as an installation surface 101) of a factory or the like. It is installed in the drainage port 102 (or drainage port). Liquid such as sewage that has spilled or discharged to the installation surface 101 is discharged from the liquid discharge port 102.

  The check valve 1 of the present embodiment is provided inside the drainage port 102 and allows the flow of liquid from the upstream side (installation surface 101 side) while blocking the flow of gas (backflow) from the downstream side. To 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 / downstream direction coincides with the up / down direction.

  The check valve 1 includes a casing 10, a valve seat member 30, and a float unit 40.

  The casing 10 is fixed to the drainage port 102 that is the installation target portion, and is formed in a cylindrical shape in which the liquid flows. The casing 10 is inserted into the circular drainage port 102 with its central axis extending vertically. Further, the casing 10 is inserted into the drainage port 102 so that the upper end surface 13, which is the upstream end, is flush with the installation surface 101.

  The casing 10 has a large diameter portion 11 and a small diameter portion 12 formed in this order from the top. The large diameter portion 11 has a larger outer diameter and inner diameter than the small diameter portion 12. The casing 10 has a bottom wall 13 at the lower end. At the center of the bottom wall 13, an outflow hole 15 for the liquid penetrating vertically is provided. Further, a cylindrical projecting portion 14 projecting downward is provided at the center of the outer surface (lower surface) of the bottom wall 13. The inside of the projecting portion 14 constitutes a part of the outflow hole 15.

  The upper opening of the casing 10 is closed by a lid 20. The lid 20 is provided on the upper end portion of the casing 10 so as to be flush with the installation surface 101. As shown in FIG. 2, the lid 20 is provided with a large number of openings 20 a, and the liquid on the installation surface 101 flows into the casing 10 through the openings 20 a of the lid 20.

  The valve seat member 30 is provided in the casing 10 and has a liquid flow hole 33. Specifically, the valve seat member 30 has a cylindrical portion 31 and a flange 32, and is provided in the outflow hole 15 of the bottom wall 13.

  The cylindrical portion 31 is formed in a cylindrical shape having a central axis extending in the up-down direction, and has a through hole 33 inside. As shown in FIG. 3, the cylindrical portion 31 is inserted into the outflow hole 15 in a state where the upper portion thereof projects upward from the inner surface 13 a (upper surface) of the bottom wall 13. That is, the flow hole 33 of the valve seat member 30 is provided coaxially with the outflow hole 15 and communicates with the outflow hole 15. The flange 32 is integrally formed on the outer peripheral surface of the cylindrical portion 31, and is formed midway in the vertical direction of the cylindrical portion 31.

  In the present embodiment, the portion of the cylindrical portion 31 protruding from the inner surface 13a of the bottom wall 13 corresponds to the cylindrical portion according to the claims of the present application.

  The inner surface 13a of the bottom wall 13 is provided with an annular step portion 13b in which the edge portion of the outflow hole 15 is recessed. The valve seat member 30 is attached to the bottom wall 13 by fitting the flange 32 into the step portion 13b and fixing it with the bolt 35. The flange 32 is provided such that the upper surface 32 a is flush with the inner surface 13 a of the bottom wall 13.

  As shown in FIGS. 4 and 5, the float unit 40 has a float 41, a rod member 42, an upper plate 43, and a bottom plate 47. The float unit 40 is detachably attached inside the casing 10.

  The float 41 is formed in a spherical shape and is made of metal, for example. The float 41 is provided in the casing 10 above the valve seat member 30. That is, the space above the bottom wall 13 in the casing 10 serves as the accommodation chamber 19 for the float 41.

  The float 41 is a valve body that is seated on and off the valve seat member 30 to open and close the flow hole 33 (outflow hole 15). More specifically, the float 41 is seated on the upper end of the cylindrical portion 31. That is, the float 41 opens the flow hole 33 (outflow hole 15) by separating from the valve seat member 30, and closes the flow hole 33 (outflow hole 15) by sitting on the valve seat member 30. The float 41 is configured to rise (float) and separate from the valve seat member 30 when the liquid that has flowed in from the upper portion of the casing 10 accumulates in the storage chamber 19.

  A plurality of rod members 42 (four in the present embodiment) are provided around the float 41 in the casing 10 (accommodation chamber 19). The rod member 42 extends in the vertical direction and constitutes a guide portion for guiding the vertical movement of the float 41. The rod member 42 has a circular cross section.

  The upper plate 43 is a substantially circular plate member that extends in the horizontal direction. The upper plate 43 is provided on the upper end of the rod member 42. Specifically, the upper plate 43 is formed with four insertion holes 43a, and the upper ends of the rod members 42 are inserted into the insertion holes 43a. The upper plate 43 is attached to the rod member 42 by fastening the nut 44 to the upper end of the inserted rod member 42. Further, the upper plate 43 is formed with four insertion holes 43b for the bolts 46 for mounting the float unit 40 in the casing 10.

  A step portion 17 is provided on the inner peripheral surface of the casing 10. The step portion 17 is a step formed at the boundary between the inner peripheral surface of the large diameter portion 11 and the inner peripheral surface of the small diameter portion 12. The float unit 40 is positioned in the vertical direction by placing the outer edge portion of the upper plate 43 on the step portion 17. The float unit 40 is attached to the casing 10 by inserting and fastening the bolts 46 into the insertion holes 43b of the upper plate 43. In this way, the float unit 40 is detachably mounted in the casing 10.

  Two eye bolts 45 are fastened to the upper surface of the upper plate 43. The eyebolt 45 is a hanging portion provided on the upper surface of the upper plate 43 for hanging the float unit 40 and removing it upward. The number of eyebolts 45 described above is an example.

  A substantially rectangular opening 43c is provided in the center of the upper plate 43, and four openings 43d formed in an arc shape are provided near the outer edge of the upper plate 43. The liquid flowing from the opening 20a of the lid 20 flows through these openings 43c and 43d.

  The bottom plate 47 is configured to prevent the float unit 40 from coming out of the plurality of rod members 42 by coming into contact with the float unit 40 when the float unit 40 is removed upward. The bottom plate 47 is provided in a portion of the rod member 42 located below the float 41.

  More specifically, the bottom plate 47 is a circular plate member that extends in the horizontal direction. The bottom plate 47 is provided at the lower end of the rod member 42. That is, the bottom plate 47 is formed with four insertion holes 47a, and the lower end of the rod member 42 is inserted into the insertion holes 47a. Then, the bottom plate 47 is attached to the rod member 42 by fastening the nut 49 to the lower end of the inserted rod member 42.

  A circular opening 47b is provided in the center of the bottom plate 47. The opening 47b is large enough to allow a part of the lower half of the float 41 to pass when the float 41 is seated on the valve seat member 30. Further, the opening 47b has a size smaller than the outer diameter of the float 41. With this configuration, when the float unit 40 is removed upward from the casing 10, the float 41 is fitted and held in the opening 47b of the bottom plate 47. Therefore, it is possible to prevent the float 41 from coming off (falling) from the rod member 42.

  As shown in FIG. 3, the cylindrical portion 31 of the valve seat member 30 is provided with two lateral holes 36. The lateral hole 36 is provided in a portion of the cylindrical portion 31 protruding from the inner surface 13a of the bottom wall 13. The two lateral holes 36 are holes that penetrate the inside and outside of the cylindrical portion 31, and are provided at positions facing each other. That is, the lateral hole 36 is a communication hole that connects the inside of the casing 10 (the accommodation chamber 19) and the communication hole 33.

  The lateral hole 36 extends in the horizontal direction. The lateral hole 36 has an opening on the outer peripheral side (an opening on the right side in FIG. 3) provided in the lowermost portion of the cylindrical portion 31 in the casing 10. That is, the opening on the outer peripheral side of the lateral hole 36 is provided at the lowermost portion of the cylindrical portion 31 protruding from the inner surface 13 a of the bottom wall 13.

  In the check valve 1 configured as described above, when the liquid does not flow, the float 41 is seated on the valve seat member 30 and the flow hole 33 is closed (the state shown by the solid line in FIG. 1). Alternatively, when the gas flows backward from the downstream side, the flow hole 33 is closed by the float 41, so that the gas reverse flow is prevented.

  Moreover, when the liquid flows into the casing 10 from the upstream side, the liquid is stored in the casing 10. Then, when the liquid level in the casing 10 reaches a predetermined height, the float 41 rises (floats) and separates from the valve seat member 30 (a state indicated by a chain double-dashed line in FIG. 1). As a result, the circulation hole 33 is opened, and the liquid is discharged from the outflow hole 15 to the downstream side.

  When the liquid does not flow in from the upstream side, the liquid level in the casing 10 gradually decreases, and the float 41 descends as the liquid level decreases. At this time, since the liquid is discharged not only from the flow hole 33 but also from the lateral hole 36, the amount of liquid discharged can be increased. Therefore, the descending operation of the float 41 becomes faster. Thereby, the flow hole 33 can be closed quickly.

  Then, after the liquid level is lowered to the upper end of the cylindrical portion 31, the liquid is discharged from the lateral hole 36, so that the liquid level in the casing 10 can be lowered to a position lower than the upper end of the cylindrical portion 31. That is, it is possible to prevent the liquid from being accumulated up to the height of the cylindrical portion 31. If the liquid remains accumulated up to the upper end of the cylindrical portion 31, it becomes difficult for the float 41 to sit on the valve seat member 30 (upper end of the cylindrical portion 31), but this can be avoided in the present embodiment. Therefore, in this embodiment, the float 41 can be reliably seated on the valve seat member 30, and the flow hole 33 can be closed.

  Then, when the liquid level is lowered to a predetermined position lower than the upper end of the cylindrical portion 31, the surface tension of the liquid in the lateral hole 36 becomes larger than the head pressure of the liquid, and the liquid is no longer discharged from the lateral hole 36. As a result, the lateral holes 36 are sealed (liquid sealed) with the liquid. Therefore, even if the gas flows backward from the downstream side, it is possible to prevent the gas from flowing into the casing 10 through the lateral hole 36. In this way, it is possible to prevent the reverse flow of gas despite the provision of the lateral hole 36 (communication hole) in the cylindrical portion 31.

  As described above, the check valve 1 of the above-described embodiment includes the valve seat member 30 that is provided so as to project from the inner surface 13 a of the bottom wall 13 of the casing 10 and that has the cylindrical portion 31 that communicates with the outflow hole 15 inside. There is. The cylindrical portion 31 is provided with a lateral hole 36 that penetrates the inside and the outside.

  According to the above configuration, when the liquid stops flowing from the upstream side, the liquid level in the casing 10 can be lowered to a position lower than the upper end of the cylindrical portion 31. Therefore, the float 41 can be reliably seated on the valve seat member 30, and the outflow hole 15 can be closed. Therefore, the valve closing performance can be improved.

  Further, in the check valve 1 of the above-described embodiment, the lateral hole 36 has the outer peripheral side opening provided in the lowermost portion of the cylindrical portion 31 in the casing 10. With this configuration, the liquid level in the casing 10 can be reliably lowered to a position lower than the upper end of the cylindrical portion 31.

(Other embodiments)
The technique disclosed in the present application may be configured as follows in the check valve 1 of the above embodiment.

  For example, the lateral hole 36 of the above embodiment may be changed in shape like the lateral hole 37 shown in FIG. The lateral hole 37 is a hole that penetrates the inside and outside of the cylindrical portion 31 as in the above embodiment. The lateral hole 37 is inclined upward from the outer peripheral side toward the inner peripheral side.

  According to the above configuration, the horizontal hole 37 can be reliably sealed with the liquid while lowering the liquid level to a position lower than the upper end of the cylindrical portion 31. Therefore, it is possible to reliably prevent the gas from flowing into the casing 10 from the lateral hole 37.

  Further, the number of the lateral holes 36 and 37 is not limited to the above-mentioned number, and it goes without saying that the number may be one or three or more.

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

1 Float type check valve 10 Casing 13 Bottom wall 13a Inner surface 15 Outflow hole 30 Valve seat member 31 Cylindrical part 36 Side hole 37 Side hole 41 Float

Claims (3)

A casing having a bottom wall formed in a cylindrical shape extending in the vertical direction and provided with a liquid outflow hole;
A valve seat member that is provided so as to project from the inner surface of the bottom wall and has a cylindrical portion whose interior communicates with the outflow hole;
A float that is housed in the casing, closes the outflow hole by sitting on the upper end of the cylindrical portion, and floats by the liquid flowing from the upper part of the casing to open the outflow hole;
The float type check valve, wherein the cylindrical portion is provided with a lateral hole penetrating inside and outside. The float type check valve according to claim 1,
The float check valve is characterized in that the lateral hole is inclined upward from the outer peripheral side toward the inner peripheral side. The float type check valve according to claim 1 or 2,
The float type check valve is characterized in that an opening on the outer peripheral side of the lateral hole is provided at the lowermost portion of the cylindrical portion.

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