JP3001382B2 - 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 which can be used 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.

In addition, a ball-shaped valve seat chamber provided with a fluid outlet at the bottom and a valve seat connected to the inside thereof and a main body provided with a fluid inlet at the top are integrally connected to each other. A cylindrical valve body having an annular piston is slidably housed so that the lower end thereof comes into contact with the annular valve seat packing portion on the upper surface of the valve seat when descending, and the upper surface of the piston of the cylindrical valve body and Conventionally, a so-called on-off valve (ON-OFF valve) that raises or lowers the cylindrical valve body by introducing a pressurized fluid into any of the working chambers formed on the lower surface to open and close the valve port is known. It is known. (See Japanese Utility Model Application Laid-Open No. 54-91730).

[0006]

The check valve having the two semicircular valve plates described above has a degree of freedom in the mounting posture of the pipe, but has a large ratio of the valve plate in the flow path and a fluid resistance. And 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, fluid pressure is applied to the upper and lower surfaces of an annular piston provided integrally with the cylindrical valve body to move the valve body up and down. An operating fluid (air) pressure source is required, and a sealing material (packing) must be provided on the peripheral surface of the cylindrical valve to prevent leakage at the sliding portion of the valve. There were problems such as increasing the size.

Further, in the above-mentioned prior art, there is a restriction in the mounting posture of the pipe as in the case of a check valve for a ship, the main material is made of metal, the resistance in the flow passage is large, and the opening and closing of the valve is difficult. As a result, there is a problem that durability is impaired due to wear of the main part due to noise and fluid.

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 intended to provide a stop valve.

[0010]

In order to achieve the above-mentioned object, a first aspect of the present invention is to provide a ball-shaped main body having a fluid inlet at the bottom and a valve seat connected to the inside, and a fluid flow at the top. A valve body is formed by integrally connecting a cylindrical cylinder portion provided with an outlet, and a cylindrical valve body is slidable so that a lower end abuts on the valve seat when descending. In the stored check valve, the outer peripheral portion of the cylindrical valve body and the inner surface of the valve body are connected via a diaphragm, and the lower surface of the diaphragm and the flow path on the inlet side from the valve seat are communicated. A compression spring mounted above the diaphragm urges the cylindrical valve body so as to abut against the valve seat, thereby reducing the outer shape of the valve seat connected to the ball-shaped main body to a conical shape for reducing fluid flow resistance. And formed in the shape of an inverted cone to increase the cross-sectional area of the flow path of the ball-shaped main body. And respectively along the outer and inner peripheral surfaces of the ball-shaped body portion of the valve seat characterized in that a rectifying grooves of plural rows.

The invention according to claim 2 is characterized in that an elastomer is mounted on at least one of the contact portions between the valve seat and the cylindrical valve body, and a planar simultaneous touch structure is provided.

According to a third aspect of the present invention, both pressure receiving chambers formed on the inlet and outlet sides of the diaphragm connecting the outer peripheral portion of the cylindrical valve body and the inner surface of the valve body are provided with bypass valves. It is characterized by being connected by a bypass pipe.

[0013]

The present invention is configured as described above.
According to the first aspect of the invention, the following operation is provided. That is, when the fluid is flowing through the piping system, the fluid flows in from the lower fluid inflow port, and the outer peripheral surface of the conical valve seat connected to the ball-shaped main body portion and the inner peripheral surface of the ball-shaped main body portion Through the rectifying grooves provided along the line, pressurizes the diaphragm pressure receiving portion against the elasticity of the compression spring, pushes the valve body upward to open the valve, and flows out to the upper outlet. At this time, the flow of the pressurized fluid that has flowed in from below has a flow line shape in which the shape of the valve seat is as streamlined as possible in order to reduce the fluid resistance, and a plurality of straightening grooves are provided in the gap with the inner surface of the main body. Through the road, it flows neatly toward the upper outlet.

In the cylindrical valve element, the inflow side (primary side) and the outflow side (secondary side) of the fluid are shut off by a diaphragm having a small sliding resistance. Fluid sealing is maintained. In addition, since the pressure receiving area of the diaphragm is large, the strength of the compression spring (coil spring) should be selected in accordance with the specification conditions such as standard, high load and low load, even if the fluid pressure varies. By mounting the valve, the valve can be opened and closed smoothly and the stroke of the valve element required for opening and closing the valve can be shortened.
High-speed opening and closing becomes possible.

According to the second aspect of the present invention, in addition to the above operation, an elastomer is mounted on at least one of the contact portions between the valve seat and the lower end of the cylindrical valve body, and the simultaneous planar touch is provided. Since it is formed in a structure, damage to the valve seat contact portion at the time of opening and closing the valve seat by the lower end of the valve body, particularly at the time of opening the valve is prevented,
The sealing property of the valve seat portion is maintained for a long time, and there is no generation of metallic noise at the time of contact.

According to the third aspect of the present invention, the diaphragm connecting the outer peripheral portion of the cylindrical valve body and the inner surface of the valve body is formed on the inlet side (primary side) and the outlet side (secondary side). The two pressure receiving chambers are connected by a bypass pipe having a bypass valve.When opening and closing the valve, the bypass valve of the bypass pipe is appropriately opened in advance, and the fluid pressure is released to the primary side. A sudden change in pressure due to opening or closing of the valve can be buffered, and damage to the check valve, other equipment, and the pipeline can be prevented.

[0017]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention,
The left side of the Y line shows the state when the valve is closed, and the right side shows the state when the valve is open.

First, the state when the valve is closed on the left side of the line YY 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 B provided below and a cylindrical cylinder portion 12 having an outlet opening C provided above by connecting bolts 13. Is formed. A conical valve seat 14 for reducing the fluid flow resistance is screwed to the outlet side and an inverted conical valve seat 15 is screwed to the inlet side to form an external part inside the ball-shaped main body 11. The contact surface A of the valve body is formed on the upper surface of the conical valve seat 14 on the outlet side. A valve seat cavity 15a is formed inside the valve seat, and the inlet-side valve seat 1 is formed.
A plurality of rectifying grooves 17 are formed on the outer peripheral surface of 5, and a plurality of rectifying grooves 18 are formed on the inner peripheral surface of the ball-shaped main body 11 so as to face the valve seat. In the figure, reference numeral 19 denotes a screwing corner formed in the outlet side valve seat 14 for integrating it with the inlet side valve seat 15, and the shape is not limited to that shown in the figure.

On the other hand, a cylindrical valve body 21 is housed inside the valve body 1, and the cylindrical valve body 21 is provided with a cylinder guide 12 a and a ball-shaped main body formed on the inner surface of the cylindrical cylinder 12. The valve body guide 11a is formed so as to slide along the inner surface of the valve body guide 11a formed on the inner surface above the valve seat contact surface A of the eleventh valve seat. 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 an intermediate position of the cylindrical valve body 21, and is formed by an upper surface of the ring-shaped portion and a coil spring 23. The inner peripheral portion is sandwiched between the pressed lower surface of the diaphragm retainer 24 and the outer peripheral portion is fixed to the flange 12 of the cylindrical cylinder portion 12.
b and the flange 11 b of the ball-shaped main body 11, and 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 drilled hole and 21b is a bolt.

A bypass pipe 31 is provided so as to connect the pressure receiving chambers E and F formed on the inlet side (primary side) and the outlet side (secondary side) of the diaphragm 25, respectively. The bypass pipe 31 is provided with a bypass valve 32.

The contact surface A between the lower end of the cylindrical valve element 21 and the upper surface of the outlet side valve seat 14 is shown in FIG.
As shown in FIG.
Is mounted, and comes into contact with the metal valve seat 14. FIG. 7B shows another embodiment, in which the elastomer 27 is used.
Is mounted on the valve seat 14 side, and faces the metallic tubular valve body 21. The elastomer may be attached to the valve body 21 and the valve seat 14 in addition to the fitting method.

FIG. 3 shows still another embodiment, in which elastomers 26 and 27 are mounted on the respective contact surfaces on both sides of the cylindrical valve body 21 and the valve seat 14 side.

FIGS. 4 and 5 are cross-sectional views of a main part showing another embodiment. In these embodiments, the inner diameter of the tip of the valve body 21 is tapered so that the valve can be used for high-pressure fluid by sandwiching the width of the simultaneous touch when the valve is closed, and at the same time, the fluid flow path is expanded when the valve is opened. By doing so, it plays the role of preventing damage to the distal end of the valve element.

With the above configuration, when the valve is closed on the left side of the line YY in FIG. 1, the fluid flows through the inlet side valve seat 15 and the outlet side valve seat 14 from the lower opening B, as shown in FIG. 2 to 5 comes to the contact surface A of the valve body 21, and the fluid further reaches the pressure receiving chamber E on the lower surface of the diaphragm receiver 22 through the gap of the valve body guide 11a. On the other hand, on the secondary side of the outlet C, the fluid pressure is applied to the diaphragm presser 24 and the valve body 21 is pushed down by the elastic force of the coil spring 23, and the valve seat 14 is adhered to the valve seat 14, and the sealing is performed. Holds sex.

Further, relates strokes required for opening of the 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., the diameter and the valve seat If the diameter is the same, the right side of the above equation is [circumference of valve seat (πD)
× stroke (D / 4)]. That is, the valve element is D /
Means the cross-sectional area of the cylinder 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, there is a valve body stroke of 1/4 or more of the bore diameter. If so, the entire flow would 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 pressurized fluid flows in from an opening B, it is pressurized from the gap of the valve guide 11a to the lower surface of the diaphragm receiver 22 through a flow path D on the outer periphery of the valve seats 15 and 14, and the elasticity of the coil spring 23 is increased. And the valve element 21 is pushed upward as shown in FIG. At this time, the fluid in the pressure receiving chamber F accommodating the coil spring 23 is discharged to the inside of the valve body 21 through the drill hole 21a, so that there is no hindrance to the lifting action of the valve body 21.

When the fluid passes through the flow path D on the outer periphery of the valve seats 15 and 14, a plurality of straightening grooves 17 are formed on the outer peripheral surface of the valve seat 15 and the inner peripheral surface of the ball-shaped main body 11. , 18 are provided, noise and vibration due to impact between fluids at the outlet side of the outlet side valve seat 14 are prevented, and local abrasion at the tip end of the valve body and the like is prevented.

Valve straightening groove 17 and main body straightening groove 1
8 is a sectional view taken along the line VI-VI in FIG.
This is shown in (b). In the figure, any combination of the arrangement of the flow regulating grooves such that the grooves are opposed to each other (FIG. 12B) and the arrangement of the grooves and the peaks opposite to each other (FIG. 10A) is arbitrary. . Also, the shapes of the grooves and the peaks are not limited to those shown in FIG. Similarly, FIG.
The cross-sectional shape taken along line -VII is shown in FIG. 7, and the number and shape of the peaks of the cylinder guide 12a are not limited to those shown in FIG.

The stopper at the time of full opening is restricted by the tip of the diaphragm presser 24 contacting the inner end of the cylinder portion 12.

According to this embodiment, the valve body 21 is located at the boundary between the inflow side (primary side) and the outflow side (secondary side) of the fluid.
The valve can be quickly opened and closed by introducing the fluid pressure flowing through the pipeline into the diaphragm 25 integrated with the coil spring 23. Adjusting allows automatic opening or closing of the valve. Such an operation is achieved by the diaphragm 2 attached to the peripheral surface of the cylindrical valve body 21.
5, the pressure receiving area can be increased. On the other hand, the piston 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 case using a ring or the like.

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 strength is excellent, there is no deformation or transmission due to pressure reception, sliding resistance is small, and a wide range of fluids And high repetition strength such as compression, tension, bending and the like.

In FIG. 1, a bypass pipe 31 for connecting the primary side and the secondary side is provided at an intermediate portion between the main body 11 and the cylinder 12, and the bypass valve 32 is slightly or By fully opening the valve, when the valve is suddenly closed, noise and vibration caused by the impact when the valve body 21 abuts on the valve seat 14 can be prevented, and not only the check valve but also other devices and pipelines can be prevented. Damage can be prevented. In the above-described embodiment, the structure in which the outlet end of the outlet side valve seat 14 is formed in a conical shape has been described. However, any shape that reduces the fluid flow resistance may be used.

[0033]

As described above, according to the present invention,
In the invention of claim 1, the outer peripheral portion of the cylindrical valve body and the inner surface of the valve body are connected via a diaphragm, and the lower surface of the diaphragm communicates with the flow path on the inlet side from the valve seat. A compression spring mounted above the diaphragm urges the cylindrical valve body so as to abut against the valve seat, thereby reducing the outer shape of the valve seat connected to the ball-shaped main body to a conical shape for reducing fluid flow resistance. And by forming an inverted conical shape to increase the cross-sectional area of the flow path of the ball-shaped main body, and by providing a plurality of straightening grooves along the outer surface of the valve seat and the inner surface of the ball-shaped main body, Fluid resistance on the inlet side and outlet side of the valve seat can be reduced, and a plurality of flow straightening grooves provided in the flow path between the valve seat and the main body can flow steadily toward the outlet through the flow opening. The pressure receiving part at the time of valve is a diaphragm with low sliding resistance. Because of the configuration, there is no leakage of fluid in the sliding part of the valve body, and the large pressure receiving area of the diaphragm enables smooth opening and closing of the valve by replacing the compression spring regardless of the fluid pressure. And, theoretically, it is possible to open and close at a high speed with a stroke of the valve body of 1/4 or more of the diameter.

According to the second aspect of the present invention, at least one of the abutting portions of the valve seat and the cylindrical valve body is provided with an elastomer to provide a simultaneous planar touch structure. The valve seat can be reliably sealed, and the valve body is not damaged by fluid flow when the valve is opened.

According to the third aspect of the present invention, the pressure receiving chambers formed on the primary side and the secondary side of the diaphragm connecting the outer peripheral portion of the cylindrical valve body and the inner surface of the valve body are provided with bypass valves. Connected by the bypass pipe
A sudden pressure change accompanying the opening or closing of the valve can be effectively buffered, and damage to the check valve, other equipment, and the pipeline can be prevented.

[Brief description of the drawings]

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

2 (a) and 2 (b) are cross-sectional views of essential parts showing different embodiments of a valve seat sealing surface.

FIG. 3 is a sectional view of a main part showing another embodiment of a valve seat sealing surface.

FIG. 4 is a cross-sectional view of a main part showing still another embodiment of the valve seat sealing surface.

FIG. 5 is a cross-sectional view of a main part showing still another embodiment of the valve seat sealing surface.

6 (a) and 6 (b) are cross-sectional views taken along the line VI-VI of FIG. 1, showing different embodiments.

FIG. 7 is a sectional view taken along line VII-VII of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve main body 11 Ball-shaped main body part 11a Valve body guide 11b Flange 12 Cylindrical cylinder part 12a Cylinder guide 12b Flange 13 Bolt 14 Outlet-side valve seat 15 Inlet-side valve seat 15a Valve seat cavity 16 Connecting part 17, 18 Rectifying groove 19 Threaded corner 21 Cylindrical valve 21a Drilled hole 21b Bolt 22 Diaphragm receiver 23 Coil spring 24 Diaphragm holder 25 Diaphragm 31 Bypass pipe 32 Bypass valve A Contact surface B, C Opening D Flow path E, F Pressure receiving chamber

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 15/00-15/20 F16K 1/00-1/54

Claims (3)

(57) [Claims] A valve body is formed by integrally connecting a ball-shaped main body portion provided with a fluid inlet below and a valve seat connected inside, and a cylindrical cylinder portion provided with a fluid outlet above. ,
In a check valve in which a tubular valve body is housed inside the valve body so as to be slidable so that a lower end thereof abuts on the valve seat when descending, an outer peripheral portion of the tubular valve body and an inner surface of the valve body. Are connected via a diaphragm, and the lower surface of the diaphragm communicates with the flow path on the inlet side from the valve seat, and the cylindrical valve body is brought into contact with the valve seat by a compression spring mounted above the diaphragm. The shape of the valve seat connected to the ball-shaped main body is formed into a conical shape and an inverted conical shape for reducing the fluid flow resistance so as to increase the flow path cross-sectional area of the ball-shaped main body. And a plurality of straightening grooves provided along the outer peripheral surface of the valve seat and the inner peripheral surface of the ball-shaped main body, respectively. 2. The non-return valve according to claim 1, wherein an elastomer is attached to at least one of the contact portions between the valve seat and the cylindrical valve body to have a planar simultaneous touch structure. 3. The two pressure receiving chambers formed on the inflow side and the outflow side of the diaphragm connecting the outer peripheral portion of the cylindrical valve body and the inner surface of the valve body are connected by a bypass pipe having a bypass valve. The check valve according to claim 1 or 2, wherein