Double eccentric butterfly valve with tubular metal sheet

Abstract

A double eccentric butterfly valve with a tubular metal sheet is disclosed. [Solution] The double eccentric butterfly valve to which the tubular metal sheet of the present invention is applied comprises a cylindrical valve body 100 connected to a pipeline, a ring-shaped body seat 200 continuously provided along the inner circumferential surface of the valve body, a retainer 300 for fixing the body seat, a rotating shaft 400 inserted into the valve body and rotatably coupled, a valve disc 500 eccentrically coupled to the rotating shaft and opening and closing the valve body by rotation, and a disc seat 600 provided along the outer circumferential edge of the valve disc and in close contact with the body seat to provide airtightness, wherein the body seat is tubular and made of a metal material.

Description

[[Technical Field]]

[0001] The present invention relates to butterfly valves, and more particularly, to a double eccentric butterfly valve equipped with a tubular seat made of a metal material. [[Background Art]]

[0002] To remove nitrogen oxides contained in marine engine exhaust gas, SCR (Selective Catalytic Reduction) equipment is used.

[0003] SCR functions by injecting urea water into exhaust gas to replace nitrogen oxides with water and nitrogen.

[0004] A control valve is used to control the flow of exhaust gas in such an SCR.

[0005] For example, when navigating in a nitrogen oxide emission control area for exhaust gas, closing the bypass valve blocks exhaust gas discharged to the outside, after which nitrogen oxides are removed via the SCR. Conversely, when navigating in a non-control area, opening the bypass valve discharges the exhaust gas, after which the SCR valve is closed to stop the operation of the SCR.

[0006] On the other hand, there is EGR (Exhaust Gas Recirculation) equipment that controls the flow of exhaust gas so that exhaust gas discharged from a marine engine can be recirculated and reused.

[0007] In the case of LNG-powered ships, methane slip discharged due to incomplete combustion has a greenhouse effect 21 times that of carbon dioxide. Although there are currently no regulations on methane slip, it is expected that LNG methane slip will also become subject to regulation when the IMO strengthens greenhouse gas emission regulations.

[0008] The EGR system can recirculate exhaust gas to reduce methane slip by 50% or more, and improve fuel efficiency by 3% or more.

[0009] Therefore, even in EGR systems, a control valve is necessary to control the direction of exhaust gas movement and guide the exhaust gas recirculation system to its optimal efficiency. Butterfly valves are typically used for control valves in SCR and EGR systems.

[0010] Generally, butterfly valves are installed in facilities in extreme environments requiring high airtightness, such as pipelines carrying fluids like water, oil, and gas at high temperatures and pressures, to selectively block the flow of fluid.

[0011] Figure 1 is a perspective view showing the appearance of a typical eccentric butterfly valve.

[0012] As shown in the figure, it consists of a cylindrical valve body 10 connected to a pipeline, a disc-shaped disk 20 rotatably mounted inside the valve body 10, a shaft 30 eccentrically connected to rotate the disk 20, and a driving means 40 for rotationally driving the shaft.

[0013] In such a butterfly valve, the valve operates by rotating the disc 20 using a drive mechanism to open / close the flow path formed within the valve body 10. However, in order to completely shut off the fluid flow in such a butterfly valve, the airtightness between the inner surface of the valve body 10 and the outer edge of the disc 20 is a very important factor. To improve this airtightness, a double or triple eccentric structure is typically employed, allowing for high airtightness performance with low operating torque.

[0014] In double eccentric butterfly valves, friction occurs between the seat and the disc during the valve opening and closing process, so soft seats are mainly used. Rubber or silicone is used in ambient temperature environments, while graphite or ceramic fiber is used in extreme environments (high temperature, high pressure, cryogenic temperatures).

[0015] However, soft sheets have limitations, such as low reliability due to continuous wear and a short lifespan, making them unsuitable for use in extreme environments.

[0016] Therefore, although this problem was overcome by introducing a triple eccentric butterfly valve with a shifted machining center axis for the conventional seat and disc, it has the drawback of high machining costs because it requires specialized machining equipment.

[0017] Therefore, while conventional double eccentric butterfly valves are used, an alternative to soft seats is needed to ensure durability and airtightness even in extreme environments. [Prior art documents] [Patent Documents]

[0018] [Patent Document 1] Korean Registered Patent Publication No. 10-0367532 [Patent Document 2] Korean Published Patent Publication No. 10-2017-0037432 [Patent Document 3] Korean Registered Patent Publication No. 10-1167271 [Patent Document 4] Korean Registered Patent Publication No. 10-1092286 [Patent Document 5] Korean Registered Utility Model Publication No. 20-0395014 [Overview of the project] [Problems that the invention aims to solve]

[0019] The objective of the present invention, in order to solve the above-mentioned problems, is to provide a double eccentric butterfly valve to which a tubular metal sheet is applied, which has a structure that is durable and wear-resistant even in extreme environments. [Means for solving the problem]

[0020] To achieve the above object, a double eccentric butterfly valve to which the tubular metal sheet according to the present invention is applied comprises: a cylindrical valve body connected to a pipe; a ring-shaped body seat continuously provided along the inner circumferential surface of the valve body; a retainer for fixing the body seat; a rotating shaft inserted through the valve body and rotatably coupled thereto; a valve disc eccentrically coupled to the rotating shaft and opening and closing the valve body by rotation; and a disc seat provided along the outer peripheral edge of the valve disc and hermetically sealing the valve disc by being in close contact with the body seat, wherein the body seat is tubular and may be made of a metal material. Here, the body seat may include a hollow metal tube and connectors respectively inserted into both ends of the metal tube to connect the two ends to each other.

[0021] In this case, it is preferable that a clearance is formed between the connector and the end of the metal sheet. Effects of the Invention

[0022] According to the present invention described above, the following effects are obtained.

[0023] First, since the body seat is in the form of a seamless tube, it can be easily manufactured by bending, so the production is easy, which reduces costs and improves competitiveness.

[0024] Second, since the body seat is made of a metal material, wear resistance and durability are ensured even in extreme environments, so there is an advantage that stable airtight performance can be secured.

[0025] Third, since frictional force is reduced, the operating torque for opening and closing the valve disc can be reduced, thereby reducing the weight of the drive unit and ensuring operational stability.

[0026] Fourth, jamming caused by interference of the disc seat in contact with the body seat is minimized.

[0027] Fifth, by providing play between the connector and the metal tube, structural stability against thermal expansion is ensured. [Brief explanation of the drawing]

[0028] [Figure 1] This is a perspective view showing the appearance of a typical eccentric butterfly valve. [Figure 2] This is a cross-sectional perspective view showing the internal structure of a double eccentric butterfly valve to which a tubular metal sheet according to one embodiment of the present invention is applied. [Figure 3] Figure 2 is an enlarged cross-sectional perspective view showing portion A of the present invention. [Figure 4] This is a front view showing the tubular body sheet of the present invention. [Modes for carrying out the invention]

[0029] In the following, embodiments of the present invention are provided to facilitate understanding of the invention and do not limit its scope. That is, these embodiments are provided to complete the disclosure of the present invention and to fully inform a person of ordinary skill in the art to which the invention pertains, and the invention is defined solely by the scope of the claims.

[0030] Furthermore, the terms used herein are for illustrative purposes only and do not limit the invention. In this specification, singular forms include plural forms unless otherwise specified. As used herein, “comprises” and / or “comprising” do not preclude the existence or addition of one or more other components in addition to those described.

[0031] Furthermore, unless otherwise defined, all terms used herein (including technical and scientific terms) should be used in a sense that is commonly understood by those with ordinary skill in the art to which the present invention pertains. Also, terms defined in commonly used dictionaries should not be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0032] In addition, if it is determined that a specific explanation of related known technologies would unnecessarily obscure the gist of the present invention, such detailed explanation may be omitted.

[0033] A preferred embodiment of the present invention will be described in detail below with reference to the attached drawings.

[0034] First, the present invention presents a double eccentric butterfly valve comprising: a cylindrical valve body 100 connected to a pipeline; a ring-shaped body seat 200 continuously provided along the inner circumferential surface of the valve body 100; a retainer 300 for fixing the body seat 200; a rotating shaft 400 inserted into the valve body 100 and rotatably coupled; a valve disc 500 eccentrically coupled to the rotating shaft 400 and opening and closing the valve body 100 by rotation; and a disc seat 600 provided along the outer circumferential edge of the valve disc 500, wherein the body seat 200 is tubular and a tubular metal seat made of metal material is applied.

[0035] Figure 2 is a cross-sectional perspective view showing the internal structure of a double eccentric butterfly valve to which a tubular metal sheet according to one embodiment of the present invention is applied, and Figure 3 is a cross-sectional perspective view showing an enlarged view of portion A of the present invention shown in Figure 2.

[0036] The present invention is based on the general structure of a double eccentric butterfly valve, but has technical features in the shape of the body seat 200 that performs the sealing.

[0037] First, the valve body 100 will be described.

[0038] The valve body 100 is formed in a cylindrical or annular shape and is connected to a pipeline through which fluid flows.

[0039] Specifically, in the present invention, as shown in the figure, the valve body 100 may be airtightly coupled to one side an exhaust pipe through which exhaust gas from the combustion of a ship's engine is discharged, and to the other side a discharge pipe that is directly coupled to an exhaust pipe for discharge, or a bypass pipe that branches off and diverts the exhaust gas.

[0040] An "L"-shaped receiving step is formed on the inner circumferential surface of the valve body 100, thereby providing a space for the body seat 200, which will be described later, to be seated.

[0041] Next, the body sheet 200 will be described with reference to Figure 4. Figure 4 is a front view showing the tubular body sheet of the present invention.

[0042] The body sheet 200 represents a sealing member for airtightness and is formed continuously along the inner circumferential surface of the valve body 100.

[0043] The body seat 200 is airtight to completely block fluid leakage when the valve disc 500, which will be described later, is closed. In the present invention, as shown in the figure, it can be composed of a metal tube 210 made of a metal material that is tubular in shape and a connector 220 that connects them in a ring shape.

[0044] First, the metal tube 210 is preferably a hollow tube made of metal so as to ensure wear resistance and durability in extreme environments such as high temperature, high pressure, and cryogenic temperatures. The body sheet of the present invention exhibits even better effects, especially when SCRHP or EGR is used in extreme environments.

[0045] Furthermore, the metal tube 210 can be easily formed into a circular shape by bending a straight tube.

[0046] The metal tube 210 is connected by the connector 220.

[0047] The connector 220 may be made of the same metal material, have an outer diameter that is the same as the inner diameter of the metal tube 210 at both ends so as to fit into the metal tube 210, and have an outer diameter that is the same as the outer diameter of the metal tube 210 at the center.

[0048] In this case, the end of the metal tube 210 and the central part of the connector 220 can be in a structure where they are in complete contact with each other, but preferably, some play is formed as shown in the figure.

[0049] This design incorporates a gap to compensate for the expansion of the metal tube 210 due to thermal expansion at high temperatures. Conversely, it also allows for easy adaptation to thermal contraction at extremely low temperatures, which can reduce its length.

[0050] Next, the retainer 300 will be described.

[0051] The retainer 300 is configured to fix the body seat 200 to the valve body.

[0052] The retainer 300 is annular in shape and is detachably coupled to the side of the valve body 100, preventing the body seat 200 from moving or detaching from the valve body 100.

[0053] For this reason, as shown in Figure 3, it is preferable that the retainer 300 has a rectangular cross-section and has a protruding anti-detachment step portion 310 formed on its inner surface.

[0054] The detachment prevention step 310 is substantially triangular in shape, and the body sheet 200 can be installed inside it at a position corresponding to the receiving step 110.

[0055] In this case, the end of the detachment prevention step 310 does not completely cover the body sheet 200, but only partially exposes it, so that the inner periphery of the body sheet 200 can come into contact with the disc sheet 600, which will be described later.

[0056] Next, the rotating shaft 400 will be described.

[0057] The rotating shaft 400 is inserted into the valve body 100 and rotatably coupled to it.

[0058] The rotating shaft 400 is rotatably mounted via a separate boss.

[0059] The boss is hollow and tubular, and is provided on the upper and lower parts of the valve body 100, respectively.

[0060] For reference, the rotating shaft 400 can be driven to rotate by a separate actuator (not shown).

[0061] Next, the valve disc 500 will be described.

[0062] The valve disc 500 is formed in a circular plate shape and can open and close the valve body 100.

[0063] The rotating shaft 400 may be connected to the valve disc 500 by passing through it, or it may be connected to one side of the valve disc 500. Therefore, the valve disc 500 rotates due to the rotational drive of the rotating shaft 400, thereby opening and closing the valve body 100.

[0064] In this configuration, the rotating shaft 400 is eccentrically coupled to the valve disc 500. Since this eccentric structure is largely similar to that of the prior art, a detailed explanation is omitted.

[0065] Next, the disk sheet 600 will be described.

[0066] A ring-shaped disc seat 600 is provided along the outer edge of the valve disc 500.

[0067] The disc seat 600 can be detachably coupled to the valve disc 500.

[0068] Furthermore, an inclined surface is formed on the outer edge of the disc sheet 600, allowing it to adhere tightly to the body sheet 200 and provide airtightness.

[0069] The inclination angle of the inclined surface 610 is preferably 10 to 30°.

[0070] If the inclination angle of the inclined surface 610 is less than 10°, slippage will occur between the body sheet 200 and the inclined surface 610, reducing the airtightness. Conversely, if the inclination angle of the inclined surface 610 is greater than 30°, the contact force between the inclined surface 610 and the body sheet 200 will become too large, resulting in a problem where a large load is applied to the torque driving the rotating shaft 400.

[0071] As described above with reference to the drawings of embodiments of the present invention, any person with ordinary skill in the art to which the present invention belongs can make various applications and modifications within the scope of the present invention based on the above description. [Explanation of Symbols]

[0072] 100 Valve Body 110 Receiving step 200 Body Sheets 210 Metal Tube 220 connectors 300 retainers 310 Anti-detachment step 400 Rotating shaft 500 valve disc 600 disc sheets 610 Slope g play

Claims

1. A cylindrical valve body connected to the pipeline, A ring-shaped body seat is provided continuously along the inner circumferential surface of the valve body, A retainer for securing the body seat, A rotating shaft is inserted into the valve body and rotatably coupled thereto, A valve disc is eccentrically coupled to the aforementioned rotating shaft and rotates to open and close the valve body, The valve disc comprises a disc seat provided along the outer peripheral edge of the valve disc, which is in close contact with the body seat to provide airtight sealing, The body seat is characterized by being tubular in shape and made of a metal material, and a double eccentric butterfly valve to which a tubular metal seat is applied.

2. The body seat comprises a hollow metal tube and connectors inserted into both ends of the metal tube to connect them, characterized in that a double eccentric butterfly valve to which the tubular metal seat according to claim 1 is applied.

3. A double eccentric butterfly valve to which the tubular metal sheet according to claim 2 is applied, characterized in that play is formed between the connector and the end of the metal sheet.

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