JP3001404B2 - Check valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve usable regardless of vertical or horizontal piping.

[0002]

2. Description of the Related Art In general, a non-return valve is a valve which operates so as to prevent a back flow by a back pressure of a pipeline through which a liquid, a gas or the like flows, that is, a one-way valve (valve). Maintaining flow in a direction is an important condition in pipelines. However, backflow for some reason is a phenomenon that should not occur because it will not only cause damage to the equipment, but also lead to destruction of the whole equipment or disaster, so it is necessary to prevent the backflow automatically and promptly. The valve structure is important.

As a check valve conventionally used, a marine cast iron 10k swing check valve (JIS-F7373) is used.
Is mainly used for vertical piping, and may adversely affect the pipeline due to chattering or slam phenomenon (a state in which the valve body is rapidly closed) at the time of backflow. In addition, bronze for ship 1
6k Union Bonnet Type Lift Check Non-return Ball Valve (JIS
-F7417) is used only for horizontal piping, but is similar to a globe valve, has a large fluid resistance, and both of these check valves are made of metal for the valve body and valve seat material. Yes,
The disadvantages are noise due to metal noise accompanying the opening and closing of the valve, and wear of main parts such as the valve element and valve seat due to the fluid.

[0004] As one of the structures that have recently been spotlighted, two semicircular valve plates supported by a pin penetrating the center of the valve body so as to be openable and closable are provided with a spring supported by the pin. There is a check valve urged to close the valve port by a reaction force. (See Japanese Utility Model Application Laid-Open No. 60-184467.) In normal flow, the valve port is opened by stacking two semicircular valve plates back to back, and at the time of reverse flow,
The two semi-circular valve plates are quickly expanded by the force of a spring to close the valve port and prevent backflow.

Further, a body having a bulging cylindrical portion provided with a fluid outlet on one side and a valve seat connected to the inside thereof and a body having a cylindrical portion provided with a fluid inlet on the other side are integrally connected. ,
Inside, a cylinder-type valve body having an annular piston on the outer peripheral surface of the intermediate portion is slidably housed so that the packing at the end is brought into contact with the annular valve seat on the end surface of the valve seat when the valve is closed. By introducing a pressurized fluid into any of the working chambers formed on both side surfaces of the piston of the cylinder type valve body, the cylinder type valve body is slid in the cylindrical portion of the main body to open and close the valve port. Conventionally known on / off valves (ON-OFF valves) are conventionally known. (See JP-A-56-45660)

[0006]

In the above-mentioned prior art, there is a restriction on the mounting position of the pipes as in the case of a check valve for a ship, the material of the main part is made of metal, and the resistance in the flow path is large. However, there has been a problem that durability is impaired due to wear of the main part due to noise and fluid accompanying opening and closing of the valve.

The check valve having the two semi-circular valve plates described above has a degree of freedom in the mounting posture of the pipe, but the valve plate occupies a large proportion in the flow path, and the fluid resistance increases. In addition, there is a problem that the valve plate protrudes from the end face of the valve body when the valve is opened.

In the above-described conventional on-off valve, the valve element is reciprocated by applying fluid pressure to both side surfaces of an annular piston provided integrally with the cylinder-type valve element. A fluid (air) pressure source is required, and a sealing material (packing) must be provided on the peripheral surface of the cylinder to prevent leakage at the sliding portion of the cylinder. There were problems such as doing.

The present invention solves the above-mentioned problems of the prior art, and has a structure having a small fluid resistance, a small opening / closing stroke of a valve, a main part which is hardly damaged by fluid, and a reverse seal which maintains a reliable sealing property. It is an object to provide a stop valve.

[0010]

In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a ball-shaped main body in which a fluid inlet is provided below and a main valve seat is connected inside, and a fluid-like body is provided above. A valve body is formed by integrally connecting a cylindrical cylinder portion provided with an outflow port and having a sub-valve seat connected to the inside thereof, and flows out of the valve body into an upper portion of a main valve seat formed at a lower end portion. A check valve in which a bottomed cylindrical valve body having a hole is slidably housed so that a valve body main valve seat at a lower end portion abuts on the main body main valve seat when the valve is closed; The outer peripheral portion of the valve body and the inner surface of the valve body are connected via a diaphragm, and the lower surface of the diaphragm is communicated with the flow path on the inlet side by opening the main valve seat. The two sub-valve seats at the upper end of the attached cylindrical valve body are brought into contact with each other. The bottomed cylindrical valve body is urged so as to abut against the main valve seat, and the inlet side outer shape of the bottomed cylindrical valve body is formed in a conical shape for reducing fluid flow resistance, and when the valve is opened. A plurality of straightening grooves are formed along the inner peripheral surface of the ball-shaped main body from the outer peripheral surface of the main valve seat so as to smoothly guide the fluid that has passed through the main valve seat to the outlet hole of the cylindrical valve body with a bottom. It is characterized by having provided.

The invention according to claim 2 is a contact portion between the main valve seat of the ball-shaped main body portion and the sub-valve seat of the cylindrical cylinder portion and the main valve seat and the sub-valve seat of the bottomed cylindrical valve body. It is characterized in that at least one of them has an elastomer mounted thereon to have a planar simultaneous touch structure.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the embodiments shown in the drawings. FIG. 1 is a vertical cross-sectional view of a check valve according to an embodiment of the present invention. The left side of the line Y-Y shows a closed state and the right side shows a opened state.

First, the state when the valve is closed on the left side of the YY line will be described. In the figure, a valve body 1 is formed by integrating a ball-shaped body portion 11 having a fluid inlet opening C provided below and a cylindrical cylinder portion 12 having an outlet opening D provided thereon by connecting bolts 13. Is formed. The valve body 1 is usually made of metal. A plurality of straightening grooves 14 are formed inside the ball-shaped main body 11 along the inner peripheral surface of the main body 11 on the outer peripheral surface of the main valve seat 11A in order to reduce the flow path resistance.

On the other hand, a cylindrical valve body 21 with a bottom is provided inside the valve body 1.
The bottomed cylindrical valve body 21 is provided with a cylinder guide 12 formed on the inner surface of the cylindrical cylinder portion 12.
a, and a valve body formed on the inner surface at a position above a plurality of straightening grooves 14 formed along the inner circumferential surface of the ball-shaped main body portion 11 from the outer circumferential surface of the main valve seat 11A of the ball-shaped main body portion 11. It is housed so as to slide along the inner surface of the guide 11a. A diaphragm receiver 22 formed by bending a peripheral end portion of the ring-shaped portion downward is formed integrally with an outer peripheral portion at a substantially intermediate position of the cylindrical valve body 21, and an upper surface of the ring-shaped portion,
The inner peripheral portion is clamped by the lower surface of the diaphragm retainer 24 pressed by the coil spring 23, and the outer peripheral portion is clamped by the flange 12b of the cylindrical cylinder portion 12 and the flange 11b of the ball-shaped main body portion 11, The diaphragm 25 is mounted by bending the intermediate portion so as to correspond to the stroke of the cylindrical valve body 21. In the figure, 21a
Is a drill hole opened in the pressure receiving chamber G accommodating the coil spring 23, 21b is a bolt for fastening the diaphragm receiver 22 and the diaphragm presser 24, and 21c is a bottom opposed to the main valve seat 11A of the ball-shaped main body 11. Outflow holes are formed in the upper part of the main valve seat 21A of the attached cylindrical valve body 21 in such a manner that a plurality of the holes are bored in the circumferential direction and inclined upward.

The main valve seat 11A of the ball-shaped main body 11 described above.
And the sub-valve seat 12B of the cylindrical cylinder portion 12, the main valve seat 21A at the lower end of the cylindrical valve body 21 with the bottom, and the sub-valve seat 2 at the upper end.
2 and FIG.
As shown in FIG. 7, the elastomers 15 and 17 are mounted and come into contact with the metal valve seats 11A and 12B.

FIG. 3 shows another embodiment, in which elastomers 15 and 16 are mounted on both the bottomed cylindrical valve body 21 and the main valve seats 12A and 11A of the ball-shaped main body 11. The method of attaching the elastomer includes an integral vulcanization method and the like in addition to the fitting method.

As another embodiment, although not shown, the main valve seat 21A and the sub-valve seat 21B of the bottomed cylindrical valve element 21 are provided.
The outer diameter of the tip is tapered, and the width of simultaneous touch at the time of valve closing is narrowed to enable use for high-pressure fluid.
Also, it plays a role of preventing damage to the tip of the valve element.

With the above configuration, when the valve is closed on the left side of the line Y-Y in FIG.
Thus, the contact portion A between the main body main valve seat 11A and the valve body main valve seat 21A is reached. On the other hand, the fluid pressure on the secondary side of the upper outlet opening D is higher than that of the cylinder guide 12a and the drill hole 21a.
Is pressed by the diaphragm presser 24, and the cylindrical valve body 21 with the bottom is pushed down by the elastic force of the coil spring 23, so that the valve body main valve seat 21A comes into contact with the main body main valve seat 11A, and the sealing is performed. Holds sex.

Further, relates strokes required for opening the bottom with the tubular valve body 21, in cross-sectional area ^{πD 2/4 = πD × D} / 4 of Formula valve bore below, D: diameter or Benza径, i.e., When the bore and the valve seat diameter are the same, the right side of the above equation is expressed as [circumference of valve seat (πD)
× stroke (D / 4)]. That is, the valve element is D /
Means a cylindrical cross-sectional area perpendicular to the flow through the valve seat opening when the stroke has risen by four strokes. Therefore, when the bore diameter and the valve seat diameter are the same, if there is a valve body stroke with a bore diameter of 1/4 or more, , The entire flow will flow. Thereby, the valve element 21
The moving distance of the valve is shortened, so that the valve can be quickly opened and closed.

Next, the valve opening state on the right side of the line YY in FIG. 1 will be described. In the figure, when a pressure fluid flows in from the inlet opening C and the surface pressure on the lower surface of the bottomed cylindrical valve body 21 exceeds the elasticity of the coil spring 23, the bottomed cylindrical valve body 21
Rises slightly (opens the valve), and at the same time, the main valve seat 11A,
A pressure fluid is introduced into the lower surface F of the diaphragm receiver 22 from the gap of the valve body guide 11a and pressurized through the flow path E on the outer peripheral portion of the valve body main valve seat 21A, and overcomes the elasticity of the coil spring 23 further. As shown in FIG.
1 is pushed up. At this time, the fluid in the pressure receiving chamber G accommodating the coil spring 23 is discharged into the inside of the bottomed cylindrical valve body 21 through the through hole 21a, so that the rising action of the bottomed cylindrical valve body 21 (valve opening). There is no problem.

When the fluid passes through the flow path E on the outer periphery of the main valve seat 11A and the valve main valve seat 21A, a plurality of straightening grooves 14 are formed on the inner peripheral surface of the ball-shaped main body 11. In addition, the inlet-side outer shape corresponding to the distal end portion of the bottomed tubular valve body 21 is formed into a shape without fluid loss, the number of outflow holes 21c at the top of the valve body main valve seat 21A is plural, and Since the outlet 21c is disposed at a position opposed to the plurality of flow straightening grooves 14, noise and vibration due to the impact of the fluids are prevented, and local abrasion at the tip of the valve body and the like is prevented.

FIG. 6 shows a cross-sectional shape of the main body straightening groove 14 along the line VI-VI in FIG. In the figure,
Although the groove of the flow regulating groove 14 and the outflow hole 21c are arranged so as to face each other, it is needless to say that the shapes of the groove and the hole are not limited to those shown in FIG.

As shown in the enlarged view of FIG. 4, the stopper when the bottomed cylindrical valve body 21 is fully opened includes a sub-valve seat 21B of the valve body 21 and a sub-valve seat 12B of the cylindrical cylinder portion 12. Is restricted by the contact. In addition, since the elastomer 16 is mounted on at least one of the sub-valve seat contact portions B, it is possible to prevent noise immediately before full opening and damage or wear of the unstable sub-valve contact portion at an intermediate opening. Can be.

According to this embodiment, the diaphragm 25 is located at the boundary between the inflow side (primary side) and the outflow side (secondary side) of the fluid and integrated with the cylindrical valve body 21 with a bottom. The opening and closing of the valve can be quickly performed by introducing the fluid pressure flowing through the passage, and the valve can be automatically opened and closed by adjusting the coil spring 23 until the fluid pressure reaches a low pressure to a high pressure. It can be opened or closed. This effect is because the pressure receiving area can be increased by the diaphragm 25 attached to the peripheral surface of the cylindrical valve body 21 with a bottom. On the other hand, an O-ring or the like is often attached to the piston which is often used in the conventional valve of this type. The sliding resistance required for opening and closing can be significantly reduced as compared with the used one.

The most distinctive feature of the diaphragm is that by forming a reinforcing cloth or the like inside the diaphragm (cross section) at the same time, the diaphragm is excellent in strength, there is no deformation or transmission due to pressure reception, sliding resistance is small, and a wide range of fluids is available. And high repetition strength such as compression, tension, bending and the like.

[0026]

As described above, according to the present invention,
According to the first aspect of the present invention, a cylindrical body portion provided with a fluid inlet below and connected to a main valve seat inside, and a cylindrical cylinder portion provided with a fluid outlet above and connected to an auxiliary valve seat inside. Are integrally connected to form a valve body, inside the valve body, a bottomed cylindrical valve body having an outflow hole above a main valve seat formed at a lower end portion, and a lower end portion of the valve body when the valve is closed. In a check valve in which a valve body main valve seat is slidably housed so as to abut on the main body main valve seat, an outer peripheral portion of the bottomed cylindrical valve body and an inner surface of the valve main body are connected via a diaphragm. Connected, the lower surface of the diaphragm is communicated with the flow path on the inlet side by opening the main valve seat, and both the sub-valve seats of the cylindrical cylinder portion and the upper end of the bottomed cylindrical valve body are brought into contact with each other, Also, when the valve is closed, the cylindrical valve body with bottom is brought into contact with the main valve seat by the compression spring mounted above the diaphragm. The bottom-side cylindrical valve body is formed in a conical shape to reduce the fluid flow resistance at the inlet side of the bottomed cylindrical valve body, and the fluid that has passed through the main valve seat when the valve is opened is discharged from the bottomed cylindrical valve body. By providing a plurality of straightening grooves along the inner peripheral surface of the ball-shaped main body from the outer peripheral surface of the main valve seat, so as to guide smoothly to the hole,
When the valve is opened, the fluid resistance of the flow passing through the outlet side provided at the upper part of the main valve seat of the bottomed cylindrical valve body via the inlet side of the main valve seat and the main valve seat portion can be reduced, and the flow can be tidyly arranged. Since it can flow toward the outlet, and because the pressure receiving part at the time of valve opening is constituted by a diaphragm with small sliding resistance,
Since there is no leakage of fluid in the sliding portion of the valve body and the pressure receiving area of the diaphragm is large, the valve can be smoothly opened and closed by replacing the compression spring regardless of the fluid pressure, and theoretically Can open and close at a high speed with a stroke of the valve body of 1/4 or more of the bore.

According to the second aspect of the present invention, the main valve seat of the ball-shaped main body and the sub-valve seat of the cylindrical cylinder portion abut on the main valve seat and the sub-valve seat of the bottomed cylindrical valve body. At least one of the parts is equipped with an elastomer to provide a flat simultaneous touch structure, so that reliable sealing at both the valve body and the valve body side valve seats can be ensured, and the fluid flow at the time of valve opening No damage to the valve.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a check valve according to an embodiment of the present invention, in which a left side of a Y-Y line shows a state when the valve is closed and a right side shows a state when the valve is opened.

FIG. 2 is a sectional view of a main part of a main valve seat contact portion A.

FIG. 3 is a sectional view of a main part showing another embodiment of a main valve seat contact portion A.

FIG. 4 is a sectional view of a main part of an auxiliary valve seat contact portion B.

FIG. 5 is a sectional view taken along line VV of FIG. 1;

FIG. 6 is a sectional view taken along line VI-VI of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve main body 11 Ball-shaped main body part 11A Main valve seat 11a Valve body guide 11b Flange 12 Cylindrical cylinder part 12B Sub-valve seat 12a Cylinder guide 12b Flange 13 Connection bolt 14 Straightening groove 15 Elastomer (for valve body main valve seat) 16 Elastomer (For main valve seat of main body) 17 elastomer (for sub valve seat for valve body) 21 cylindrical valve body with bottom 21a drill hole 21b bolt 21c outflow hole 22 diaphragm receiver 23 coil spring 24 diaphragm presser 25 diaphragm A main valve seat contact part B Sub valve seat contact portion C Inlet opening D Outlet opening E Flow path F Lower surface G Pressure receiving chamber

Claims (2)

(57) [Claims] 1. A ball-shaped main body portion provided with a fluid inlet below and connected with a main valve seat inside, and a cylindrical cylinder portion provided with a fluid outlet above and connected with a sub-valve seat inside. To form a valve body. Inside the valve body, a bottomed cylindrical valve body having an outflow hole at the top of a main valve seat formed at the lower end is closed when the valve is closed. In a check valve in which a valve seat is slidably housed so as to contact the main body valve seat,
The outer peripheral portion of the bottomed cylindrical valve body and the inner surface of the valve body are connected via a diaphragm, and the lower surface of the diaphragm is communicated with the flow path on the inlet side by opening the main valve seat. The shape of the cylinder part and the two sub-valve seats at the upper end of the bottomed cylindrical valve body are brought into contact with each other, and when the valve is closed, the bottomed cylindrical valve body is brought into contact with the main valve seat by a compression spring mounted above the diaphragm. , The inlet-side outer shape of the bottomed cylindrical valve body is formed into a conical shape that reduces fluid flow resistance, and the fluid that has passed through the main valve seat at the time of valve opening is used for the bottomed cylindrical valve body. A check valve characterized in that a plurality of straightening grooves are provided from the outer peripheral surface of the main valve seat to the inner peripheral surface of the ball-shaped main body portion so as to smoothly guide to the outlet hole. 2. A contact portion between a main valve seat of a ball-shaped main body and a sub-valve seat of a cylindrical cylinder portion and a main valve seat and a sub-valve seat of a bottomed cylindrical valve body. 2. A flat simultaneous touch structure, comprising an elastomer and an elastomer.
Check valve as described.