Antistatic ball valve

Abstract

The anti-static ball valve comprises a cover unit and a main body unit which are combined with each other to provide a flowing channel for fluid; a ball unit provided on the flow path of the fluid to control the flow of the fluid by rotating; a handle unit for providing an external force for rotating the ball unit; a stem unit connecting the ball unit and the handle unit so as to transmit the external force provided by the handle unit to the ball unit; a first liner unit provided on an inner surface of the cover unit so that the cover unit does not come into contact with the fluid and oxidation of the cover unit caused by the fluid is prevented; and a second liner unit provided on an inner surface of the main body unit so as to prevent oxidation of the main body unit by the fluid while the main body unit does not come into contact with the fluid, the first liner unit and the second liner unit being made of a fluororesin, and the ball unit and the stem unit being made of a metal.

Description

Technical Field

[0001] The utility model relates to an antistatic ball valve, and more specifically, to an antistatic ball valve capable of grounding static electricity generated during fluid flow and preventing explosion hazards caused by sparks and the like. Background Art

[0002] A ball valve is a type of valve used to control the flow of a fluid, and is a valve used to adjust the amount of fluid passing through the valve using a rotatable spherical ball.

[0003] The spherical ball has a hole formed at the center, and the position and size of the hole can be adjusted while rotating by a rotatable shaft.

[0004] When the hole formed in the spherical ball is in a straight line with the flow path, it is in a completely open state, and when it is at a right angle to the flow path, it is in a completely blocked state.

[0005] The ball valve as described above is used to control the flow of various liquid chemicals and the like required in the manufacturing process of semiconductors or displays and the like.

[0006] Here, a chemical called dilute hydrofluoric acid is used in processes such as cleaning and etching of semiconductor substrates. The chemical reagent has high purity and is highly toxic.

[0007] On the other hand, static electricity caused by friction may be generated in the flow of chemicals, which may sometimes cause sparks and lead to unexpected problems such as explosions.

[0008] In order to solve the problem caused by static electricity, as disclosed in the existing patent publication No. 10-2010-0090944, a spring is provided at the connection between the valve stem and the ball, and the antistatic effect brought by the spring is expected. However, the problem that the fastening force between the valve stem and the ball is reduced by the spring also leads to the problem that it is difficult to maintain purity due to oxidation and the like.

[0009] Therefore, there is an urgent need to develop a ball valve that can maintain the purity of explosive chemicals while preventing the possibility of explosion caused by static electricity. Summary of the invention

[0010] Technical issues to be solved

[0011] The utility model aims to provide an antistatic ball valve which prevents impurities from being generated by oxidation, thereby maintaining the purity of a flowing fluid, and can ground static electricity generated by friction with the fluid, thereby preventing explosion hazards caused by sparks, etc.

[0012] Solutions to the problem

[0013] According to the utility model, the antistatic ball valve includes: a cover unit and a main body unit, the cover unit and the main body unit provide a flow channel for the fluid by combining with each other; a ball unit, the ball unit is arranged on the flow channel of the fluid and controls the flow of the fluid by rotating; a handle unit, the handle unit is used to provide an external force to rotate the ball unit; a valve stem unit, the valve stem unit connects the ball unit and the handle unit so as to transmit the external force provided by the handle unit to the ball unit; a first lining unit, the first lining unit is arranged on the inner surface of the cover unit so as to prevent the cover unit from contacting with the fluid and prevent oxidation of the cover unit caused by the fluid; and a second lining unit, the second lining unit is arranged on the inner surface of the main body unit so as to prevent the main body unit from contacting with the fluid and prevent oxidation of the main body unit caused by the fluid, the first lining unit and the second lining unit are made of fluororesin so as to reduce the generation of static electricity caused by friction with the fluid, and the ball unit and the valve stem unit are made of metal so as to ground the static electricity generated in the flow channel.

[0014] According to the antistatic ball valve of the utility model, it also includes a grounding wire unit, and the grounding wire unit is connected to the valve stem unit to achieve the grounding.

[0015] According to the utility model, the anti-static ball valve also includes a sheet ring unit, which is arranged between the ball unit and the first lining unit. When the fluid passes through the fluid hole of the ball unit, the sheet ring unit prevents the fluid from flowing toward the valve stem unit. The sheet ring unit provides a non-contact space between the side in contact with the ball unit, so that the fluid can be retained in the space even if it penetrates one of the sides.

[0016] Effects of the Invention

[0017] According to the antistatic ball valve of the utility model, the generation of impurities is prevented by preventing the contact between the oxidizable component and the flowing fluid, thereby maintaining the purity of the flowing fluid.

[0018] Furthermore, even if static electricity is generated due to friction during the flow of fluid, dangers such as explosions due to sparks can be prevented by grounding.

[0019] In addition, the flowing fluid is prevented from flowing toward the valve stem, thereby preventing the possibility of leakage to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The utility model is a combined stereoscopic diagram showing an antistatic ball valve according to the present utility model.

[0021] Figure 2 This is an exploded perspective view showing an antistatic ball valve according to the utility model after being exploded.

[0022] Figure 3 yes Figure 1 Cross-sectional view of .

[0023] (Explanation of Reference Numerals)

[0024] 100: Antistatic ball valve

[0025] 110: Cover unit

[0026] 120: Main unit

[0027] 130: Ball unit

[0028] 140: Handle unit

[0029] 150: Valve stem unit

[0030] 160: First lining unit

[0031] 170: Second lining unit

[0032] 180: Ring unit

[0033] 192: V-ring

[0034] 194: Sealing gland

[0035] 196: Washer

[0036] 198: Indicator

[0037] 199: Snap ring DETAILED DESCRIPTION

[0038] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the concept of the present invention is not limited to the proposed embodiments, and those skilled in the art who understand the concept of the present invention can easily propose other retroactive inventions or other embodiments within the scope of the concept of the present invention by adding, changing, deleting, etc. other constituent elements within the same concept, but these will also be considered to be included in the scope of the inventive concept of this application.

[0039] In addition, the same reference numerals are used for components having the same functions within the scope of the same concept shown in the drawings of the respective embodiments.

[0040] Figure 1 is a combined stereogram showing an antistatic ball valve according to the utility model, Figure 2 This is an exploded perspective view showing an antistatic ball valve according to the utility model. Figure 3 yes Figure 1 Cross-sectional view of .

[0041] Reference Figures 1 to 3 According to the utility model, the antistatic ball valve 100 (hereinafter referred to as "ball valve") is a valve used to control the flow of fluid, and the fluid can be various liquid chemicals used in the manufacturing process of semiconductors or displays.

[0042] The ball valve 100 may include a cover unit 110 , a body unit 120 , a ball unit 130 , a handle unit 140 , a valve stem unit 150 , and the like.

[0043] The cover unit 110 and the main body unit 120 may provide a flow channel for the fluid by being coupled to each other using stud bolts and nuts.

[0044] The body unit 120 may provide a space S for separately accommodating the ball unit 130 therein, and the space S may be provided by a combination of the cover unit 110 and the body unit 120 by manufacturing the cover unit 110 and the body unit 120 symmetrically to each other.

[0045] The ball unit 130 is disposed on the flow channel of the fluid and can control the flow of the fluid by rotating, and a fluid hole H can be formed at the center of the ball unit 130 and provided therethrough.

[0046] The handle unit 140 may be a unit for providing an external force to rotate the ball unit 130 , and the valve stem unit 150 may be a unit for connecting the ball unit 130 and the handle unit 140 in order to transmit the external force provided by the handle unit 140 to the ball unit 130 .

[0047] The ball unit 130 may include an insertion groove G into which the distal end of the stem unit 150 is inserted, so that the ball unit 130 rotates in conjunction with the rotation of the stem unit 150 .

[0048] The first lining unit 160 is a unit provided on the inner surface of the cover unit 110, and prevents oxidation of the cover unit 110 caused by the fluid by preventing the cover unit 110 from contacting the fluid. The first lining unit 160 may be composed of PFA (Perfluoroalkoxy), which is a type of fluororesin, to increase corrosion resistance.

[0049] The first lining unit 160 may be formed on the inner surface of the cover unit 110 with a predetermined thickness. In order to increase the bonding force between the first lining unit 160 and the cover unit 110 , a dovetail groove formed on one side of the cover unit 110 may be filled with PFA and then hardened.

[0050] The second lining unit 170 is a unit arranged on the inner surface of the main body unit 120. By preventing the main body unit 120 from contacting the fluid, oxidation of the main body unit 120 caused by the fluid is prevented. Similar to the first lining unit 160, it can be composed of PFA (Perfluoroalkoxy), which is a type of fluororesin, to increase corrosion resistance.

[0051] The second lining unit 170 may be formed on the inner surface of the main body unit 120 with a predetermined thickness. In order to increase the bonding force between the second lining unit 170 and the main body unit 120 , a dovetail groove formed on one side of the main body unit 120 may be filled with PFA and then hardened.

[0052] The first lining unit 160 and the second lining unit 170 are in direct contact with the fluid, and can ensure the purity of the fluid by preventing impurities from being generated by the cover unit 110 and the main body unit 120 .

[0053] In addition, the first lining unit 160 and the second lining unit 170 can reduce the generation of static electricity caused by friction during the flow of the fluid, thereby significantly reducing the probability of static electricity generation compared to the existing ball valve.

[0054] On the other hand, the ball unit 130 and the valve stem unit 150 may be made of a material different from a material used to manufacture the first lining unit 160 and the second lining unit 170 .

[0055] Specifically, in order to ground static electricity that may be generated in the flow channel, the ball unit 130 and the valve stem unit 150 may be made of metal.

[0056] As mentioned above, due to the first lining unit 160 and the second lining unit 170, compared with the existing ball valve, the ball valve 100 according to the utility model has a significantly lower probability of generating static electricity caused by friction, but this does not mean that static electricity is not generated at all.

[0057] For this reason, in the present invention, although the possibility is low, static electricity may still be generated, and by making the ball unit 130 and the valve stem unit 150 of a metal material, such as SCS or SUS material, they become a medium that allows electric charge to flow.

[0058] The valve stem unit 150 may be connected to a grounding wire unit (not shown), and grounding is achieved by the grounding wire unit.

[0059] On the other hand, the ball valve 100 according to the present invention may include a sheet ring unit 180, which is arranged between the ball unit 130 and the first lining unit 160. When the fluid passes through the fluid hole H of the ball unit 130, the sheet ring unit 180 prevents the fluid from flowing toward the valve stem unit 150.

[0060] The ring unit 180 may also be disposed between the ball unit 130 and the second liner unit 170 , and may be made of PTFE (Polytetrafluoroethylene) material which is a type of fluororesin.

[0061] The sheet ring unit 180 may provide a non-contact space S1 between the surfaces in contact with the ball unit 130 , and the space S1 serves as a space where the fluid can be retained even if it penetrates one of the surfaces, thereby minimizing the possibility of outflow of the fluid.

[0062] The ball valve 100 according to the present invention may include a V-ring 192 , a sealing gland 194 , a gasket 196 , an indicator 198 and a retaining ring 199 .

[0063] The V-ring 192 may be made of PTFE (Polytetrafluoroethylene) material which is a kind of fluororesin, and may be a component for sealing the valve stem unit 150 .

[0064] The sealing gland 194 may be made of SCS or SCPH2 material, and may be combined with the main body unit 120 to prevent the valve stem unit 150 from being separated.

[0065] The gasket 196 may be made of PTFE (Polytetrafluoroethylene).

[0066] The indicator 198 is a member for recognizing the degree of rotation of the stem unit 150 or the ball unit 130 caused by the rotation of the handle unit 140 , and may be made of a SUS material.

[0067] The collar 199 is made of SUS material and can be inserted into the valve stem unit 150 .

[0068] To summarize the above, the first lining unit 160 and the second lining unit 170 are structures that maintain the purity of the fluid at a high purity by preventing impurities generated by oxidation, corrosion, etc. of the cover unit 110 and the main body unit 120 .

[0069] In addition, since the first lining unit 160 and the second lining unit 170 are made of fluororesin, the generation of static electricity that may occur in the flow of fluid may be minimized.

[0070] For the reasons described above, in order to maintain high purity of the fluid while minimizing the generation of static electricity that may cause explosions, etc., preferably, all structures that can come into contact with the fluid are made of fluororesin. In other words, the ball unit 130 and the valve stem unit 150 also need to be lined with fluororesin.

[0071] However, even if all structures that come into contact with the fluid are made of fluororesin, the possibility of static electricity generation cannot be completely prevented. Although the possibility is low, if static electricity is generated, it may cause very serious problems such as explosion due to lack of grounding.

[0072] Therefore, in the present invention, even if the function of maintaining high purity is slightly reduced and the possibility of generating static electricity is slightly increased, the ball unit 130 and the stem unit 150 are made of metal so that static electricity can be grounded.

[0073] Here, even though the ball unit 130 and the valve stem unit 150 are made of metal that is not lined with fluororesin, the fluid contact portion is relatively small compared to the first lining unit 160 and the second lining unit 170. Therefore, the degree of reduction in the function of maintaining high purity due to the lack of lining treatment is slight, and on the contrary, the addition of the electrostatic grounding function ensures a significant effect of fundamentally blocking the explosion hazard.

[0074] Finally, the main technical feature of the utility model is that in order to optimally achieve the two effects of maintaining high purity and electrostatic grounding, the cover unit 110 and the main body unit 120 are lined inside, while the ball unit 130 and the valve stem unit 150 are not lined.

[0075] The structure and features of the present invention are described above based on the embodiments of the present invention, but the present invention is not limited thereto. It is obvious to those skilled in the art that various changes or modifications can be made within the concept and scope of the present invention. Therefore, it is stated that such changes or modifications fall within the scope of the attached claims.

Claims

1. An antistatic ball valve, characterized in that: include: A cover unit and a main body unit, wherein the cover unit and the main body unit are combined with each other to provide a flow channel for the fluid; a ball unit, the ball unit being arranged on the flow channel of the fluid and controlling the flow of the fluid by rotating; A handle unit, the handle unit is used to provide an external force to rotate the ball unit; a valve stem unit, the valve stem unit connecting the ball unit and the handle unit so as to transmit the external force provided by the handle unit to the ball unit; a first lining unit, the first lining unit being arranged on the inner surface of the cover unit so as to prevent the cover unit from contacting with the fluid and preventing oxidation of the cover unit caused by the fluid; and a second lining unit, the second lining unit being arranged on the inner surface of the main body unit so as to prevent the main body unit from contacting with the fluid and from being oxidized by the fluid; The first lining unit and the second lining unit are made of fluororesin to reduce the generation of static electricity caused by friction with the fluid. The ball unit and the stem unit are made of metal in order to ground the static electricity generated in the flow channel.

2. The antistatic ball valve according to claim 1, characterized in that: It also includes a grounding wire unit, which is connected to the valve stem unit to achieve the grounding.

3. The antistatic ball valve according to claim 1, characterized in that: The valve stem unit further comprises a ring unit, which is disposed between the ball unit and the first liner unit. When the fluid passes through the fluid hole of the ball unit, the ring unit prevents the fluid from flowing toward the valve stem unit. The sheet ring unit provides a non-contact space between the one side in contact with the ball unit, so that the fluid can be retained in the space even if it penetrates one of the one sides.

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