KR20190008973A - Plastic valve for preventing turbulence - Google Patents

Abstract

Disclosed is a plastic valve capable of improving strength, impact resistance, and mechanical properties. The plastic valve includes: a main body; a core formed inside the main body; and an opening/closing portion. In this case, the main body is formed of a mixed material obtained by mixing a glass fiber and polyvinyl chloride (PVC), polypropylene (PP), polyphenylene sulfide (PPS) or polyphthalamide (PPA), and the core is formed therein with a fluid transfer hole through which a fluid flows. The opening/closing portion makes contact with one end of the core through a hole of the main body to block a movement of the fluid when the valve is closed, and side portions adjacent to the hole of the main body have a curved shape at an inner surface of the core corresponding to the fluid transfer hole to prevent vortex in the fluid transfer hole.

Description

PLASTIC VALVE FOR PREVENTING TURBULENCE

The present invention relates to a plastic valve having improved strength, impact resistance and mechanical properties.

A valve is a means for opening and closing the flow of a fluid, which uses a diaphragm or ball to control the flow of the fluid.

1 is a view showing the structure of a general valve.

Referring to Figure 1, the valve includes a body 100, a diaphragm 102, and an operating portion 104 for controlling the diaphragm 102.

A fluid transfer hole 106 is formed in the main body 100 and the fluid input to the input end 110 of the fluid transfer hole 106 is discharged through the output end 112.

Since the main body 100 is made of soft plastic, the strength, impact resistance, and mechanical characteristics of the main body 100 are low.

Korean Patent Registration No. 1019364 (registered on February 24, 2011)

The present invention provides a plastic valve with improved strength, impact resistance and mechanical properties.

A plastic valve according to an embodiment of the present invention includes a main body, and the main body is made of a mixed material of polyvinyl chloride (PVC) and glass fiber.

A plastic valve according to another embodiment of the present invention includes a main body, and the main body is made of a mixed material of polypropylene (PP) and glass fiber.

A plastic valve according to another embodiment of the present invention includes a main body, and the main body is made of a mixed material of polyphenylene sulfide (PPS) and glass fiber.

A plastic valve according to another embodiment of the present invention includes a body, wherein the body is made of a mixture of polyphthalamide (PPA) and glass fiber.

According to another aspect of the present invention, there is provided a plastic valve comprising: a main body; And a core formed inside the body. Here, the core may be a mixture of a fluororesin and polyvinyl chloride (PVC), polypropylene (PP), polyphenylene sulfide (PPS), or polyphthalamide (PPA) .

According to another aspect of the present invention, there is provided a plastic valve comprising: a main body; A core formed inside the body; And an opening / closing part. The main body may be made of glass fiber, polyvinyl chloride (PVC), polypropylene (PP), polyphenylene sulfide (PPS) or polyphthalamide (PPA) And a fluid transfer hole through which the fluid flows is formed in the core. Wherein the opening / closing portion contacts the one end of the core through the hole of the main body when the valve is closed to block the movement of the fluid, and the inner side of the core corresponding to the fluid delivery hole Both sides of the body adjacent to the hole have a curved shape.

The main body of the plastic valve according to an embodiment of the present invention is formed of glass fiber and polyvinyl chloride (PVC), polypropylene (PP), polyphenylene sulfide (PPS) It is made of a mixture of polyphthalamide (PPA).

The core of the plastic valve according to an embodiment of the present invention is formed on the inner side of the main body, and the core is made of fluororesin, polyvinyl chloride (PVC), polypropylene (PP), polyphenylene sulfide Phenylene sulfide (PPS), or polyphthalamide (PPA).

Since the plastic valve according to the present invention uses a mixed material produced by mixing glass fiber with PVC, PP, PPS or PPA in the main body, the strength, impact resistance and mechanical characteristics of the main body can be improved.

1 is a view showing the structure of a general valve.
2 is a perspective view illustrating a plastic valve according to an embodiment of the present invention.
3 is a cross-sectional view schematically showing a plastic valve according to a first embodiment of the present invention.
4 is a perspective view schematically showing the structure of a core and a main body according to an embodiment of the present invention.
5 is a view schematically showing a plastic valve according to a second embodiment of the present invention.
6 is a view schematically showing a plastic valve according to a third embodiment of the present invention.
FIG. 7 is a view showing a portion of the lower inner side contacting the opening / closing part according to an embodiment of the present invention.
8 to 10 are views showing various structures of a diaphragm as an opening and closing part of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic valve, and more particularly, to a plastic valve which is made of polyvinyl chloride (PVC), polypropylene (PP), polyphenylene sulfide (PPS) or polyphthalamide And a body made of a mixed material produced by mixing the above materials. When the body is manufactured from such a mixed material, the strength, impact resistance, mechanical properties, etc. of the body can be improved.

Hereinafter, various structures and operations of the plastic valve of the present invention will be described in detail with reference to the accompanying drawings.

The plastic valve can use a diaphragm or a ball as an opening and closing part, but the diaphragm will be used as an opening and closing part for convenience of explanation. However, irrespective of the structure of the opening and closing part, the structure of the inner surface of the fluid transfer hole or core can be applied to all plastic valves.

FIG. 2 is a perspective view showing a plastic valve according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view schematically showing a plastic valve according to the first embodiment of the present invention. 4 is a perspective view schematically showing the structure of a core and a main body according to an embodiment of the present invention.

2 and 3, the plastic valve of this embodiment includes a main body 200, a core 202, an operating portion 204, and an opening / closing portion 300.

The main body 200 is made of plastic and may be made of polyvinyl chloride (PVC), polypropylene (PP), polyphenylene sulfide (PPS) or polyphthalamide (PPA) And a glass fiber (glass fiber).

According to one embodiment, the main body 200 may be made of a mixed material of PVC and glass fiber. Preferably, the glass fiber may contain less than 21% of the total, and PVC has a content ratio greater than 79% of the total. The experimental results of the mixed materials are shown in Table 1 below.

Example glass fiber mixing ratio (%) Tensile strength (Mpa @ 23 [deg.] C) [ASTM D638] For comparison 0 318 One 3 429 2 6 487 3 9 532 4 12 585 5 15 643 6 18 698 7 21 746

As shown in Table 1, when the main body 200 is formed of a mixture of PVC and glass fiber, the tensile strength of the main body 200 is higher than that of the main body made of PVC alone without glass fiber It can be confirmed that it is considerably high. That is, the mechanical and chemical properties can be improved, so that the body 200 can be formed light and hard while improving the mechanical properties. However, when the content ratio of the glass fiber exceeds 21%, the characteristics of the injection process for manufacturing the main body 200 are lowered, and it is difficult to manufacture the main body 200 in a desired shape.

According to another embodiment, the main body 200 may be made of a mixture of PP and glass fiber. Preferably, the glass fiber may be contained at 42% or less of the total, and the PP has a content ratio larger than 58% of the total. The experimental results of the mixed materials are shown in Table 2 below.

Example glass fiber mixing ratio Tensile strength (Mpa @ 23 [deg.] C) [ASTM D638] For comparison 0 168 One 3 239 2 6 277 3 9 312 4 12 341 5 15 368 6 18 396 7 21 428 8 23 439 9 26 457 10 29 474 11 30 496 12 33 571 13 36 622 14 39 658 15 42 682

As shown in Table 2, when the main body 200 is formed of a mixture of PP and glass fiber, it is confirmed that the tensile strength of the main body 200 is significantly higher than that of the main body made of PP without glass fiber . That is, mechanical and chemical properties can be improved. However, when the content ratio of the glass fiber exceeds 42%, the characteristics of the injection process for manufacturing the main body 200 are lowered and it is difficult to manufacture the main body 200 in a desired shape.

According to another embodiment, the main body 200 may be made of a mixture of PPS and glass fiber. Preferably, the glass fiber may contain less than 21% of the total, and the PPS has a content ratio greater than 79% of the total. The experimental results of the mixed materials are shown in Table 3 below.

Example glass fiber mixing ratio Tensile strength (Mpa @ 23 [deg.] C) [ASTM D638] For comparison 0 261 One 3 329 2 6 367 3 9 412 4 12 475 5 15 528 6 18 572 7 21 638

As shown in Table 3, when the main body 200 is formed of a mixture of PPS and glass fiber, it is confirmed that the tensile strength of the main body 200 is significantly higher than that of the main body made of PPS alone without glass fiber . That is, the mechanical and chemical properties can be improved, so that the body 200 can be formed light and hard while improving the mechanical properties. However, when the content ratio of the glass fiber exceeds 21%, the characteristics of the injection process for manufacturing the main body 200 are lowered, and it is difficult to manufacture the main body 200 in a desired shape.

According to another embodiment, the main body 200 may be made of a mixed material of PPA and glass fiber. Preferably, the glass fiber may contain less than 9% of the total, and the PPA has a content ratio greater than 91% of the total. The experimental results of the mixed materials are shown in Table 4 below.

Example glass fiber mixing ratio Tensile strength (Mpa @ 23 [deg.] C) [ASTM D638] For comparison 0 218 One 3 389 2 6 426 3 9 472

As shown in Table 4, when the main body 200 is formed of a mixture of PPA and glass fiber, it is confirmed that the tensile strength of the main body 200 is significantly higher than that of the main body made of PPA without glass fiber . That is, the mechanical and chemical properties can be improved, so that the body 200 can be formed light and hard while improving the mechanical properties. However, when the content ratio of the glass fiber exceeds 9%, the characteristics of the injection process for manufacturing the main body 200 are lowered, and it is difficult to manufacture the main body 200 in a desired shape.

Holes 220 may be formed at the lateral ends of the body 200 and the fastening means may connect the plastic valve and the pipe through the holes 220 although not shown.

The core 202 is formed on the inner side of the main body 200 and a hole (fluid transfer hole) 210 for fluid movement is formed on the inner side of the core 202.

According to one embodiment, the core 202 may be made of a fluororesin. The fluororesin generally refers to a resin containing fluorine in the molecule. Examples of the fluororesin include polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE) and the like, and tetrafluoroethylene perfluoroalkyl vinyl ether copolymer (Tetra fluoro ethylene perfluoro alkyl vinyl ether coppolymer, PFA). These fluororesins are excellent in heat resistance, chemical resistance, electrical insulation, friction coefficient, and adhesion and adhesiveness. That is, when the core 202 is formed of the fluorocarbon resin, since the coefficient of friction of the core 202 is small, the flow rate change due to the laminar flow in the fluid delivery hole 210 can be minimized. That is, the difference between the flow rate at the upper or lower side of the fluid delivery hole and the flow rate at the center can be minimized based on a specific point.

The opening and closing part 300 may be positioned on the body 200 or the core 202 as a means for allowing or closing fluid movement in the fluid delivery hole 210. When the fluid is allowed to flow to the fluid transfer hole 210, the opening and closing part 300 has the structure of FIG. 3. When closing the fluid flow in the fluid transfer hole 210, the opening and closing part 300 300 may contact a portion 210c of the lower inner side surface 222 of the core 202. [

For example, the opening and closing part 300 may be a diaphragm or a bowl. In the drawings, the diaphragm is used as the opening and closing part 300, but it is not limited to the diaphragm.

The operation unit 204 is a means for controlling the opening and closing operation of the opening and closing unit 300. For example, the operating unit 204 can control the opening and closing unit 300 so as not to contact or contact the lower inner side surface 222 of the core 202. [

The connection portion 302 connected to the upper portion of the opening and closing portion 300 may be coupled to the operating portion 204 and the opening and closing portion 300 may be raised or lowered under the control of the operating portion 204. [ The implementation of such an operation unit 204 can be variously modified, and many structures have been proposed in the past, and the existing structure can be adopted as it is.

On the other hand, as far as the main body 200 is made of the above mixed material and the core 202 is made of fluororesin, the structure of the plastic valve can be variously modified. Hereinafter, a plastic valve having an innovative structure compared to a conventional plastic valve that can prevent a vortex while utilizing a body 200 made of such a mixed material and a core 202 made of a fluororesin will be described in detail.

3 and 4, the core 202 is formed on the inside of the main body 200, and includes an upper inner side surface 220 and a lower inner side surface 222, and a portion of the opening / A hole 400 which can be moved up and down can be formed.

The fluid transfer hole 210 corresponding to the inner surface of the core 202 includes an input end 210a and an output end 210b and the fluid input to the input end 210a is transferred to the output end 210b.

According to one embodiment, a curved portion is formed in at least a part of the upper inner side surface 220 and the lower inner side surface 222 of the core 202, and an obstacle obstructing the flow of the fluid Etc.) do not exist.

The portions 220a and 220b adjacent to the hole 400 of the upper inner side surface 220 of the opening and closing part 300 may have a curved shape as shown in Fig. 3, The portions 222a and 222b corresponding to the curved portions of the upper inner side surface 220 and the portion 210c contacting the opening and closing portion 300 may have a curved shape.

Here, the curved portions 220a, 220b, 222a, and 222b may be formed by sloping toward the opening and closing part 300. When the upper inner side surface 220 and the lower inner side surface 222 of the core 202 are formed as described above, there is no obstacle obstructing the flow of the fluid in the fluid transfer hole 210. As a result, a vortex may not be generated in the fluid transfer hole 210.

The portions 200a, 220c, 200b, and 200c of the body 200, corresponding to the curved portions 220a and 220b of the upper inner side surface 220 and the curved portions 222a and 222b of the lower inner side surface 222, 200d may also have a curved shape. Here, the radius of curvature of corresponding curved portions may be the same or similar. That is, unlike the prior art, in the plastic valve of the present invention, the inner surfaces 220 and 222 of the core 202 and corresponding body portions may have a curved shape.

From the energy point of view, the shape of the inner surfaces 220 and 222 of the core 202 can be designed so that the Bernoulli's theorem is applied from the input 210a to the output 210b of the fluid transfer hole 210 have. In detail, according to Bernoulli's theorem, the fluid energy (the sum of the kinetic energy and the kinetic energy) is constant anywhere in the fluid delivery hole 210 without loss. Conversely, if a loss occurs, fluid energy can vary from location to location. Thus, the plastic valve of the present invention can be used to design the inner surfaces 220 and 222 of the core 202 so that Bernoulli's theorem applies, i.e., the fluid energy is the same at any location of the fluid delivery hole 210, So that the fluid transfer hole 210 can be formed. For example, the fluid energy E1 at the input end 210a of the fluid delivery hole 210, the fluid energy E2 at the portion corresponding to the opening and closing part 300, and the fluid energy E3 at the output end 210b, The fluid delivery hole 210 can be designed to be substantially the same.

In the prior art, Bernoulli's theorem is not applied to a fluid transfer hole due to a fluid energy loss due to an obstacle such as a square corner. However, in the plastic valve of the present invention, Bernoulli's theorem can be applied to the fluid transporting hole 210 since the fluids 220 and 222 have no fluid energy loss.

From the viewpoint of the fluid velocity, considering the cross section of the fluid transfer hole 210 with respect to a specific point of the fluid transfer hole 210, the fluid flows up and down at the corresponding point. At this time, if the velocities of the fluids flowing up and down are different, a vortex may occur if the velocity of the fluid flowing to the upper or lower part is different from the velocity of the fluid flowing to the center part. Therefore, the shape of the fluid delivery hole 210 can be determined so that the velocities of the fluid flowing up and down in the fluid delivery hole 210 are substantially equal to each other to prevent vortex generation.

However, in order to minimize the frictional force of the fluid flowing through the core 202, the flow rate of the fluid flowing toward the center portion may be different from that of the fluid flowing toward the upper portion or the lower portion due to the frictional force of the inner surfaces 220 and 222 of the core 202, Is formed of a mixture of fluororesin and PVC, PP, PPS or PPA. Therefore, if the velocity of the fluid is totally the same at the specific point, for example, at the portion of the fluid delivery hole 210 corresponding to the opening / closing part 300, the velocity difference between the upper and lower fluids due to the core 202 can be neglected Vortex may not be generated.

According to another embodiment, the portion 210c of the lower inner side surface 222 that contacts the opening / closing portion 300 may have a curved shape at least partially. Particularly, both side edge portions of the lower inner side surface 222 of the portion 210c contacting the opening / closing portion 300 may have a curved shape. As a result, even if the fluid flows beyond the portion 210c of the lower inner side surface 222 that contacts the opening / closing portion 300, the portion 210c contacting the opening / closing portion 300 of the lower inner side surface 222, The flow is not interrupted. As a result, no eddy current may be generated in the fluid transfer hole 210, particularly around the hole 400.

In summary, the plastic valve of the present invention can form the shape of the inner surfaces 220 and 222 of the core 202 to prevent eddy currents in the fluid delivery holes 210.

5 is a view schematically showing a plastic valve according to a second embodiment of the present invention.

Referring to FIG. 5, a portion of the upper inner side surface 220 and the lower inner side surface 222 of the core 202 may have a curved shape.

The portions 220a and 220b adjacent to the hole 400 in the upper inner side surface 220 have a curved enhancement and the portions 220a and 220b each have a portion of the imaginary circles c1 and c5 Lt; / RTI >

In addition, portions 222a and 222b corresponding to portions 220a and 220b of lower inner side surface 222 may be part of virtual circles c2 and c6, respectively.

In addition, the portion 210c of the lower inner side surface 222 that contacts the opening / closing portion 300 may also be a part of the imaginary circle c4.

That is, the curved portions 220a, 220b, 222a, 222b and 210c of the inner sides 220 and 222 of the core 202 may be part of the virtual circles c1, c2, c4, c5 and c6, have. As a result, there is no obstacle obstructing the fluid flow in the fluid transfer hole 210, so that a vortex may not be generated in the fluid transfer hole 210.

Here, the curved portions 220a, 220b, 222a, 222b, and 210c are portions contacting the portions near the opening and closing part 300 or the opening and closing part 300. [ 5, the fluid transfer hole 210 may have a convex shape instead of a straight shape. In this case, any one of the convex portions 220a, 220b, 222a, 222b, and 210c may have a curved shape Vortices are more likely to occur if they have a non-rectangular shape.

Conventional valve designers have never known whether a vortex is generated, so that convex portions are formed at right angles to facilitate mold manufacturing. However, due to such a right angle portion, that is, obstacles, vortices have to be generated in the fluid transfer hole, but they have not recognized such vortex generation.

Accordingly, the present invention has developed an optimal plastic valve capable of recognizing such a vortex and preventing eddy current, and separately realized a mold for manufacturing such a plastic valve. In particular, the radii of the imaginary circles (c1, c2, c4, c5 and c6) are designed to maximize the flow of the fluid.

When the portion 210c of the lower inner side surface 222 contacting the opening and closing part 300 and the ends of the hole 400 are connected to each other, the virtual circle c3 is formed. When the opening and closing part 300 is recessed do. As a result, the fluid transfer hole 210 can be formed entirely without angled portions.

6 is a view schematically showing a plastic valve according to a third embodiment of the present invention.

6, the portion 210c of the lower side inner surface of the core 202 that contacts the opening / closing portion 300 may have an elliptic shape (e2), and the opening / closing portion 300 The concave portion when contacting the portion 210c may also have the shape of an ellipse (e1).

According to one embodiment, the long axis radius of the ellipse e2 may be less than twice the short axis radius. When the long axis radius becomes twice or more the short axis radius, the portion 210c that contacts the opening / closing part 300 in the lower side inner surface may be an obstacle obstructing the flow of the fluid. Therefore, the vortex can be prevented by making the radius of the long axis of the ellipse e2 smaller than twice the radius of the short axis so that the portion 210c that contacts the opening / closing portion 300 is not an obstacle.

Further, the long axis radius of the ellipse e1 may be smaller than twice the short axis radius.

FIG. 7 is a view showing a portion of the lower inner side contacting the opening / closing part according to an embodiment of the present invention.

Referring to FIG. 7A, the portion 210c of the lower inner side of the core, which contacts the opening and closing part 300, may have a curved shape as a whole.

7B, the corner portions 702 and 704 of the portion 210c contacting the opening / closing portion 300 of the lower inner side surface may have a curved shape and the central portion 700 may have a flat shape . In this case, since the corner portions 702 and 704 have a curved shape, the fluid can pass through the portion 210c, which is in contact with the open / close portion 300 of the lower inner surface, without fluid energy loss.

8 to 10 are views showing various structures of a diaphragm as an opening and closing part of the present invention.

As the opening and closing part 300, the diaphragm may have a single membrane structure as shown in Fig. 8, and may have a double membrane structure or a triple membrane structure as shown in Figs.

Referring to FIG. 8, the diaphragm of this embodiment has a single membrane structure and may have a structure in which a connection portion 302 is formed at an upper end thereof.

Specifically, the mounting portion 806 protrudes from the top surface bottom of the curved portion 802, and the connecting portion 302 can be coupled to the mounting portion 806. [ A flat portion 800 extending from the mounting portion 806 in the left and right directions may be formed and a fixing hole 800a used to connect the diaphragm to the operating portion 204 may be formed on the flat portion 800 And may be formed at the end portion.

The diaphragm may have a gull shape as a whole, and the mounting portion 806 may have various shapes as well as a rectangular cross-section as shown in FIG.

Referring to Fig. 9, the diaphragm of this embodiment may have a bilayer structure. Specifically, the diaphragm may include an upper film 900 and a lower film 902 which are coupled to each other in the vertical direction.

A lower mounting portion 926 may be formed at the center of the lower film 902 and a connection portion 302 may be coupled to the center of the mounting portion 926. Of course, the lower flat portion 920 is formed in the longitudinal direction of the lower mounting portion 926.

The upper film 900 includes an upper mounting portion 914 corresponding to the lower mounting portion 926, and a hole 914a is formed at the center thereof. Here, the connection portion 902 coupled to the lower mounting portion 926 passes through the hole 914a of the upper mounting portion 914 and is exposed to the outside. The lower surface of the upper film 900 has a structure capable of receiving the lower mounting portion 926 and an upper flat portion 910 is formed in the longitudinal direction of the upper mounting portion 914.

On the other hand, holes 912a and 920a corresponding to the fixing holes of the single film can be formed in the upper film 900 and the lower film 902, respectively.

The upper film 900 and the lower film 902 may have a similar structure as a whole.

Referring to FIG. 10, the diaphragm of this embodiment may have a triple-layer structure. Specifically, the diaphragm may include an upper film 1000, an intermediate film 1002, and a lower film 1004 which are sequentially coupled.

The lower film 1004 includes a lower mounting portion 1036, and a connecting portion 302 may be vertically coupled to the center of the lower mounting portion 1036. Further, the lower flat portion 1030 is formed in the longitudinal direction of the lower mounting portion 1036.

The intermediate membrane 1002 includes an intermediate mounting portion 1024 coupled to the lower mounting portion 1036 and a lower face of the intermediate mounting portion 1024 has a structure capable of receiving the upper face of the lower mounting portion 1036. [ At this time, a hole 1024a is formed at the center of the intermediate mounting portion 1024, and the connection portion 302 passes through the hole 1024a. Further, the intermediate flat portion 1022 is formed in the longitudinal direction of the intermediate mounting portion 1024.

The upper film 1000 includes an upper mounting portion 1014 coupled with the intermediate mounting portion 1024 and a lower surface of the upper mounting portion 1014 has a structure capable of accommodating the upper surface of the intermediate mounting portion 1024. At this time, a hole 1014a is formed at the center of the upper mounting portion 1014, and a connection portion 302 passing through the intermediate mounting portion 1024 is exposed to the outside through the hole 1014a. Further, the upper flat portion 1012 is formed in the longitudinal direction of the upper mounting portion 1014.

On the other hand, holes 1010, 1020 and 1030 corresponding to the fixing holes of a single membrane can be formed in the upper film 1000, the intermediate film 1002 and the lower film 1004, respectively.

The upper film 1000, the intermediate film 1002 and the lower film 1004 may have a generally similar structure.

It will be apparent to those skilled in the art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. Should be regarded as belonging to the following claims.

200: main body 202: core
204: Operation part 210: Fluid transferring ball
210a: input terminal 210b: output terminal
220: upper inner side surface 222: lower inner side surface
300: opening and closing part 302:

Claims (1)

≪ / RTI >
The main body is made of a mixed material of polypropylene (PP) and glass fiber,
A core is formed on the inside of the body, the core is made of a fluororesin, a fluid transfer hole through which fluid flows is formed on the inner side of the core,
Wherein the glass fibers have a weight percentage of greater than or equal to 3% and less than or equal to 42% when the polypropylene has greater than 58% weight percent.

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