JP2015096766A - Automatic valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic valve which securely closes an inflow port (a valve seat) and achieves excellent sealability.SOLUTION: An automatic valve includes: a casing 10 provided with an inflow port of a fluid; an annular valve seat 31 formed by an elastic body; an annular fixing member 33 which fixes the outer periphery side of the valve seat 31 to a periphery of the inflow port; and a float which is housed in the casing and contacts with an inner periphery side tip 31a of the valve seat 31 to close the inflow port. The fixing member 33 includes: an annular base part 34; and a sandwiching part 35 which protrudes inward from the inner periphery side of the base part 34 and sandwiches upper and lower surfaces (an upper surface 31u and a lower surface 31d) of an outer periphery side end part of the valve seat 31 with a lower surface of a lid 12. A space S is provided between a part of a surface facing the valve seat 31 and the valve seat 31 at the sandwiching surface side of the sandwiching part 35.

Description

  The present invention relates to an automatic valve, and relates to an automatic valve such as a backflow prevention valve or a float type exhaust valve.

  As a float type exhaust valve, what is indicated by patent documents 1, for example is known. The float type exhaust valve includes a casing provided with a fluid circulation port, an annular valve seat (elastic body) provided at the fluid circulation port, a fixing member for fixing the valve seat to the casing, and a valve seat. And a valve body (float) in contact therewith. The fixing member fixes the valve seat by sandwiching the upper and lower surfaces of the outer peripheral side end portion of the valve seat with the casing. Then, the valve body that has been lifted by the buoyancy of the fluid (for example, water) comes into contact with the tip on the inner peripheral side of the valve seat, so that the flow port is closed, and the fluid from the lower part to the upper part of the casing is sealed at the flow port.

  However, in the float type exhaust valve as disclosed in Patent Document 1, it may be difficult to reliably close the flow port, and there is room for improvement in terms of sealing performance. For example, as shown in FIG. 4, the valve seat 41 of the above-described float type exhaust valve is an elastic body such as rubber. Therefore, the outer peripheral side is clamped (compressed) with the lid 42 of the casing by the fixing member 43 and the inner peripheral side. There is a possibility that a part of (for example, the left end portion of the valve seat 41) is elastically deformed and warps. When such elastic deformation occurs, the inner peripheral side of the valve seat 41 is deformed into a wave shape, and the contact between the valve body (not shown, the same applies hereinafter) and the valve seat 41 is insufficient. Exists. In this case, for example, it is difficult to ensure a sufficient contact pressure between a valve body such as a float and the valve seat 41. For this reason, the distribution port cannot be reliably closed, and there is room for improvement in terms of sealing performance. In particular, when the pressure difference between the upstream side and the downstream side of the valve body is small, the force for pressing the valve body such as a float against the valve seat 41 is small, so that the contact pressure necessary for the close contact between the valve body and the valve seat 41 is secured. It becomes difficult to do.

JP 2000-320719 A

  The present invention has been made in view of such a point, and an object of the present invention is to provide an automatic valve that can reliably close a circulation port (valve seat) and has excellent sealing performance.

  The present invention includes a valve base provided with a fluid circulation port, an annular valve seat made of an elastic body, an annular fixing member that fixes an outer peripheral side of the valve seat to a valve base around the circulation port, The present invention is directed to an automatic valve that includes a valve body that is in contact with the inner peripheral end of the valve seat and closes the flow port. And the fixing member has an annular base portion and a sandwiching portion that projects inward from the inner peripheral side of the base portion and sandwiches the upper and lower surfaces of the outer peripheral side end portion of the valve seat with the valve base portion, A space is provided between the valve seat and a part of the surface of the clamping portion that faces the valve seat.

  According to the above configuration, in the clamping portion of the fixing member, as shown in FIG. 2, a part of the surface facing the valve seat on the clamping surface side of the fixing member is cut away, so that the clamping portion and the valve seat A space is formed between Therefore, in the valve seat, the compressive stress generated on the outer peripheral side by being clamped is released from the portion corresponding to the space S. Thereby, in the valve seat, the compressive stress is not transmitted to the inner peripheral side (that is, the side in contact with the valve body such as the float), and the elastic deformation on the inner peripheral side caused by the transmission of the compressive stress is suppressed.

  As described above, according to the present invention, a part of the surface facing the valve seat on the clamping surface side of the fixing member is notched in the clamping portion of the fixing member, and a space is formed between the clamping portion and the valve seat. Therefore, the elastic deformation of the inner peripheral side of the valve seat (that is, the side in contact with the valve body such as a float) can be suppressed. Therefore, it is possible to normally contact the valve body and the valve seat. As a result, the flow port (valve seat) can be reliably closed, and the sealing performance is improved.

It is sectional drawing which shows the structure of an automatic valve. It is sectional drawing which expands and shows the X section shown in FIG. The structure of a fixing member is shown, (A) is a top view, (B) is sectional drawing. It is sectional drawing which shows the structure of the conventional float type exhaust valve.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, or its use. Moreover, the dimension of the structural member in each figure does not faithfully represent the actual dimension of the structural member, the dimensional ratio of each structural member, or the like.

  As shown in FIG. 1, the automatic valve 1 of the present embodiment is a float-type backflow prevention valve, which is provided in, for example, a drainage system and allows forward flow of water (fluid) from the upstream side to the downstream side. On the other hand, the flow in the opposite direction, that is, the flow from the downstream side to the upstream side is blocked.

  The automatic valve 1 includes a casing 10, a float receiver 21, a float 23, a valve seat 31, and a fixing member (valve seat retainer) 33.

  In the casing 10, a lid (valve base) 12 is fixed to a main body 11 with bolts, and a valve chamber 10a is formed therein. The casing 10 is provided with an inlet 13 and an outlet 14 for liquid (for example, water). That is, the inflow port 13 is formed in the lid 12 and the outflow port 14 is formed in the lower part of the main body 11. The main body 11 integrally has a plurality of ribs 15 protruding from the inner surface. In addition, the inflow port 13 comprises the distribution port which concerns on this invention.

  The float receiver 21 and the float 23 are accommodated in the casing 10 (that is, the valve chamber 10a). The float receiver 21 is formed in a substantially cylindrical shape with a bottom, and is fixed to the inside of the rib 15 in the casing 10 by a snap ring 24. The float 23 is formed in a spherical shape and is arranged in a free state in the float receiver 21. The float 23 constitutes a valve element that closes the inlet 13 in contact with an inner peripheral side tip 31a (see FIG. 2) of a valve seat, which will be described later. The float 23 may be formed hollow with a metal such as stainless steel, or may be formed with a synthetic resin or synthetic rubber in a hollow or solid solid state without voids inside. The float 23 is preferably polished to a hollow sphere close to a true sphere, and the float itself can function as a valve. Therefore, in principle, the float 23 can be sealed anywhere on the float surface, and has high reliability and durability. Can be provided. Note that FIG. 1 shows a closed valve state in which the float 23 floats as a result of liquid (not shown) flowing backward from the outlet 14.

  A through hole 22 having a small opening area communicating with the inside and the outside is formed at the bottom of the float receiver 21. The float receiver 21 has a guide function for moving the float 23 in the vertical direction.

  The valve seat 31 and the fixing member 33 are provided in the casing 10 (that is, the valve chamber 10a). The valve seat 31 is an elastic body such as rubber formed in an annular slightly plate shape. The rubber is preferably a fluorine rubber from the viewpoint of sealing properties. The fixing member 33 fixes the outer peripheral side of the valve seat 31 around the inflow port 13 in the casing 10.

  Specifically, as shown in FIGS. 2 and 3, the entire fixing member 33 is formed in a substantially flat plate shape having an annular shape. The fixing member 33 integrally includes an annular base portion 34 and a sandwiching portion 35. The sandwiching portion 35 projects inward from the inner peripheral side of the base portion 34, and is configured to sandwich the upper and lower surfaces (upper surface 31 u and lower surface 31 d) of the outer peripheral side end portion of the valve seat 31 with the lower surface of the lid 12. The clamping part 35 is provided over the entire inner circumference side of the base part 34. The fixing member 33 is fixed to the casing 10 (the lower surface of the lid 12) with bolts 32 through a plurality of (four in this embodiment) bolt holes 37 formed in the base portion 34. When the fixing member 33 is fixed with the bolt 32, the holding portion 35 of the fixing member 33 presses and holds the outer peripheral side end portion of the valve seat 31 against the lower surface of the lid 12.

  A notch 36 is provided in a part of the surface of the fixing member 33 facing the valve seat of the clamping portion 35. In other words, a part of the clamping part 35 on the clamping surface side (that is, the valve seat 31 side) is cut out in a ring shape over a predetermined length. Thus, by providing the notch 36 in the clamping part 35, a predetermined space S is formed between the clamping part 35 and the valve seat 31. Note that the space S of the fixing member 33 is not necessarily formed by notching or the like. For example, in FIG. 2, the stepped portion where the clamping part 35 contacts the lower surface or the outer peripheral surface of the valve seat 31 is formed separately from the clamping part 35 and then combined with the clamping part 35 by welding or bonding. Also good.

  Next, the operation of the automatic valve 1 will be described.

  In normal times, the float 23 is lowered by its own weight and is placed on the bottom plate of the float receiver 21. That is, the automatic valve 1 is in an open state in which the float 23 is separated from the valve seat 31 and the inflow port 13 is opened. In this state, the water that has flowed into the casing 10 (in the valve chamber 10 a) from the inflow port 13 flows from the float receiver 21 through the through holes 22 and through the spaces between the ribs 15 to the outflow port 14. Thereby, drainage is performed.

  During reverse flow in which water flows in from the outlet 14, the water flows into the float receiver 21 through the through hole 22, and the water level in the float receiver 21 rises. As the water level rises, the float 23 rises (floats) and comes into contact with the inner peripheral tip 31a of the valve seat 31. That is, the automatic valve 1 is in a closed state in which the float 23 is seated on the valve seat 31 and the inlet 13 is closed. Thereby, the backflow of water is prevented.

  Here, in the present embodiment, since the notch 36 is provided on the surface facing the valve seat 31 and the space S is formed between the clamping portion 35 of the fixing member 33 and the valve seat 31, the valve seat 31. , The elastic deformation on the inner peripheral side (that is, the side in contact with the float 23) due to the outer peripheral side end being clamped by the clamping unit 35 can be suppressed. This is because in the valve seat 31, the compressive stress generated by being sandwiched by the sandwiching portion 35 is released from the portion corresponding to the space S, and therefore, the compressive stress is not transmitted to the inner peripheral portion. That is, in the valve seat 31, the stress generated on the outer peripheral side is released to the space S until it is transmitted to the inner peripheral side portion. In this way, elastic deformation such as warping of the inner peripheral side of the valve seat 31 can be suppressed.

  Thus, the float 23 and the valve seat 31 can be normally contacted by suppressing the elastic deformation of the inner periphery side of the valve seat 31. Therefore, the contact pressure necessary for the close contact between the float 23 and the valve seat 31 can be ensured. Therefore, the inflow port 13 (valve seat 31) can be closed reliably, and the automatic valve 1 excellent in sealing performance can be provided.

  In the above embodiment, the float type check valve has been described as the automatic valve 1. However, the automatic valve 1 of the present invention is not limited to this, and the same applies to, for example, a disk type check valve and a float type exhaust valve. be able to. Moreover, although the example which accommodates the float 23 in the casing 10 containing the main body 11 and the lid | cover 12 was shown in the said embodiment, the automatic valve 1 of this invention is not restricted to this, It replaces with the casing 10 and floats in piping. The same can be applied to the case of housing the container. That is, it can be applied to an automatic valve that controls a fluid flowing in the pipe by attaching a valve base (corresponding to the lid 12) to which the valve seat 31 is attached to the pipe port.

  The present invention is particularly useful for an automatic valve including an annular valve seat (for example, a rubber valve seat) whose outer peripheral side is fixed and whose valve body is in contact with the inner peripheral side.

1 Automatic valve 10 Casing 12 Lid (valve base)
13 Inlet (distribution port)
23 Float
31 Valve seat 31a Inner peripheral side tip 31u of valve seat Upper surface 31d of outer peripheral side end of valve seat Lower surface 33 of outer peripheral side end of valve seat Fixing member 34 Base 35 Clamping part 36 Notch S Space

Claims (3)

A valve base portion provided with a fluid flow port, an annular valve seat made of an elastic body, an annular fixing member that fixes an outer peripheral side of the valve seat to a valve base portion around the flow port, and an inner portion of the valve seat An automatic valve provided with a valve body that contacts the circumferential tip and closes the circulation port,
The fixing member has an annular base portion and a clamping portion that protrudes inward from the inner peripheral side of the base portion and sandwiches the upper and lower surfaces of the outer peripheral side end portion of the valve seat with the valve base portion,
An automatic valve characterized in that a space is provided between a part of a surface of the clamping portion facing the valve seat and the valve seat.   The automatic valve according to claim 1, wherein the automatic valve is a backflow prevention valve or an exhaust valve.   The automatic valve according to claim 1, wherein the valve body is a float.

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