JP2020067135A - Float type check valve - Google Patents

Abstract

To improve maintenance performance.SOLUTION: A float type check valve 1 comprises: a cylindrical casing 10 which is fixed to an installation object section and allows fluid to pass therethrough; a valve seat member 30 which is installed inside the casing 10 and has a through hole 33 for the fluid; a float 41 which is installed above the valve seat member 30 inside the casing 10 and brought into contact with and taken away from the valve seat member 30 so as to open and close the through hole 33; and a float unit 40 which has rod members 42 installed around the float 41 in a manner that extends in a vertical direction and is detachably installed inside the casing 10. The float unit 40 has a bottom plate 47 which is fixed to the rod members 42 at positions below the float 41 and brought into contact with the float 41 so as to prevent the float 41 from being pulled out from the rod members 42 when the float unit 40 is removed in an upward direction from the casing 10.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. 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-mentioned float type check valve, it is necessary to take out the float and the guide portion separately when performing maintenance, which is troublesome.

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

  The float check valve of the present application includes a tubular casing, a valve seat member, and a float unit. The casing is fixed to the installation target portion in a state of extending in the vertical direction, and the liquid flows through the inside. The valve seat member is provided in the casing and has a liquid flow hole. The float unit has a float and a guide portion of the float, and is detachably mounted in the casing. The float is provided above the valve seat member in the casing, and seats on and off the valve seat member to open and close the flow hole. The guide portion is provided around the float and extends in the vertical direction.

  The float unit has a blocking portion. The blocking portion is provided in a portion of the guide portion located below the float. The blocking unit prevents the float from coming out of the guide unit when the float unit comes out of the guide unit when the float unit is removed upward.

  According to the float check valve of the present application, maintainability 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.

  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, at the center of the bottom wall 13, there is provided a cylindrical projecting portion 14 projecting downward. 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 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.

  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 32a is flush with the inner surface 13a 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 communication hole 33 by separating from the valve seat member 30, and closes the communication hole 33 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 upstream side is accumulated 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 constitutes a blocking unit that blocks 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.

  Further, 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 that protrudes 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 hole that connects the inside of the casing 10 (the accommodation chamber 19) and the circulation hole 33.

  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 has dropped to the upper end of the cylindrical portion 31, the liquid is discharged from the lateral hole 36, so that it is possible to prevent the liquid from remaining at the height of the cylindrical portion 31. If the liquid remains accumulated up to the height of the cylindrical portion 31, it becomes difficult for the float 41 to sit on the valve seat member 30 (the upper end of the cylindrical portion 31), but this can be avoided in the present embodiment. That is, in the present embodiment, the flow hole 33 can be surely closed.

  Even after the liquid in the casing 10 is discharged, the lateral holes 36 are sealed by the surface tension of the liquid. Therefore, it is possible to prevent the gas from flowing into the casing 10 through the lateral hole 36 from the downstream side.

  As described above, in the check valve 1 of the above-described embodiment, the float unit 40 is provided in a portion of the rod member 42 (guide portion) located below the float 41, and when the float unit 40 is removed upward. It has a bottom plate 47 (blocking portion) that prevents the float 41 from coming out of the rod member 42 (guide portion) when the float 41 contacts.

  According to the above configuration, when the float unit 40 is removed (pulled up) upward, the float 41 can be prevented from coming out of the rod member 42. ) Can be removed upwards. Therefore, the maintainability of the float 41 and the rod member 42 (guide portion) is improved.

  Further, in the check valve 1 of the above embodiment, the float 41 is formed in a spherical shape. The bottom plate 47 (blocking portion) is provided at the lower end of the rod member 42 (guide portion) and extends in the horizontal direction. Further, the bottom plate 47 has an opening of a size that allows a part of the lower half portion of the float 41 to pass when the float 41 is seated on the valve seat member 30 and that is smaller than the outer diameter of the float 41. 47b is provided.

  According to the above configuration, it is possible to prevent the float 41 from coming out of the rod member 42 when the float unit 40 is removed, without hindering the operation of the float 41 to sit on the valve seat member 30.

  Further, in the check valve 1 of the above-described embodiment, the float unit 40 is provided on the upper end of the rod member 42 (guide portion), is provided on the upper plate 43 extending in the horizontal direction, and the upper surface of the upper plate 43. It has an eyebolt 45 (hanging part) for hanging 40 and removing it upward. With this configuration, the float unit 40 can be easily taken out from above.

  Further, in the check valve 1 of the above embodiment, the step portion 17 is provided on the inner peripheral surface of the casing 10 to position the float unit 40 in the vertical direction by mounting the outer edge portion of the upper plate 43. . According to this configuration, the work of attaching the float unit 40 becomes easy.

  Further, in the check valve 1 of the above-described embodiment, the guide portion is the plurality of rod members 42 extending in the vertical direction. According to this configuration, the frictional resistance (sliding resistance) between the float 41 and the guide portion can be reduced as compared with, for example, a cylindrical guide portion provided around the float.

(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, in the above embodiment, the float unit 40 is attached by fixing the upper plate 43 to the step portion 17 of the casing 10 with the bolt 46, but bolt fastening is omitted and the upper plate 43 is placed on the step portion 17. Alternatively, the float unit 40 may be provided inside the casing 10.

  Further, in the above embodiment, the bar member 42 is used as the guide portion, but a cylindrical member provided around the float and extending in the vertical direction may be used as the guide portion.

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

1 Float type check valve 10 Casing 17 Step part 30 Valve seat member 33 Flow hole 40 Float unit 41 Float 42 Bar member (guide part)
43 Upper Plate 45 Eye Bolt (Hanging Part)
47 Bottom plate (blocking part)
47b opening

Claims (5)

A tubular casing that is fixed to the installation target portion in a state of extending in the vertical direction and through which the liquid flows,
A valve seat member provided in the casing and having a liquid flow hole,
A float that is provided above the valve seat member in the casing and that is seated on and off the valve seat member to open and close the flow hole; and a float that is provided around the float and that extends vertically. A float unit having a guide portion and detachably attached in the casing;
The float unit is provided in a portion of the guide portion that is located below the float, and when the float unit is removed upward, a blocking portion that prevents the float from coming out of the guide portion by contact with the float unit is provided. A float check valve characterized by having. The float type check valve according to claim 1,
The float is formed in a spherical shape,
The blocking portion is a bottom plate that is provided at the lower end of the guide portion and extends in the horizontal direction, and has a size that allows a part of the lower half portion of the float to pass when the float is seated on the valve seat member. The float check valve is characterized in that an opening having a size smaller than the outer diameter of the float is provided. The float type check valve according to claim 1 or 2,
The float unit has an upper plate that is provided on the upper end of the guide portion and extends in the horizontal direction, and a suspending portion that is provided on the upper surface of the upper plate and that suspends the float unit and removes it upward. Float type check valve. The float type check valve according to claim 3,
The float type check valve, wherein a step portion is provided on the inner peripheral surface of the casing for positioning the float unit in the vertical direction by mounting the outer edge portion of the upper plate. The float type check valve according to claim 1,
The float check valve, wherein the guide portion is a plurality of rod members extending in the vertical direction.

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