Damper valve with a structure with an air sealing groove formed in the landing bar

Abstract

The present invention discloses a damper valve having a structure in which an air sealing groove is formed in the landing bar. Specifically, a damper body having an inlet formed on the front side and an outlet formed on the rear side to form a fluid passage for transferring fluid from the inlet side to the outlet side; a landing bar continuously protruding along the inner circumference of the damper body; a rotating shaft rotatably coupled by penetrating the damper body vertically up and down; a blade coupled to the rotating shaft and rotating in conjunction with the rotation of the rotating shaft; and a sealing unit provided along the edge of the blade and in close contact with the landing bar to primarily prevent fluid leakage; wherein an air sealing groove is formed inside along the circumference of the landing bar, and when the sealing unit is in close contact with the air sealing groove, the air supplied to the air sealing groove can secondarily prevent fluid leakage.

Description

Technology Field

[0001] The present invention relates to a damper valve, and more specifically, to a damper valve having a structure in which an air sealing groove is formed inside a landing bar installed for sealing the damper valve, into which air can be injected. Background Technology

[0003] A damper is generally a device installed in the flue of a boiler or the air passage of an air control device that can block or open the internal flow path as needed, and serves to change the flow path of the fluid or prevent backflow of the fluid.

[0004] In addition, it is important for dampers to prevent leakage between the blade and the inner surface of the damper body or the landing bar in order to improve airtightness and effectively control fluid flow as needed, and various structures have been developed to prevent or minimize leakage.

[0005] In the case of a butterfly type damper, to block the flow of fluid transferred into the damper body or to prevent backflow of the fluid, a blade installed inside the damper is used as a blade made of a soft material such as rubber or Teflon, or a blade made of a metal material, but to improve blocking performance, the blade is configured with an eccentric shaft structure.

[0006] However, dampers applied to control high-temperature fluid flows, such as exhaust gases with a maximum temperature of 450°C, cannot use blades made of soft materials such as rubber or Teflon, and blades with an eccentric shaft structure are made of expensive parts, which poses a problem in terms of using the blades.

[0007] Therefore, increasing the sealing surface pressure (tightness pressure) between the blade and the landing bar (seat) requires excessive operating torque.

[0008] As an alternative to this, an air sealing damper was used to control the flow of high-temperature fluids, such as exhaust gases containing high levels of sulfur oxides and scrubber systems, by supplying sealing air at a pressure higher than that of the fluid between two blades to form an air seal.

[0009] Conventional air sealing dampers use a leaf seal of 0.2 to 0.3 mm to prevent leakage between the blade and the landing bar. However, there is a problem in that the blade inside the air sealing damper, which is installed in a large size in a pipe through which exhaust gas flows, expands when it comes into contact with high-temperature fluids, including high-temperature exhaust gas containing sulfur oxides, thereby forming a gap between the body seat and the outer periphery of the blade. Additionally, since the blade and the landing bar are manufactured by welding, the precision of alignment between them is poor. To solve this, a leaf seal formed of Hastelloy metal, which can maintain elasticity at high temperatures and has high corrosion resistance to sulfur oxides, has been developed.

[0010] However, conventional air ceiling dampers have the disadvantage of requiring a large amount of air because they spray high-pressure air to form an air curtain. Prior art literature

[0012] Republic of Korea Registered Patent No. 10-2313841 (Oct. 12, 2021) "High-temperature damper" Republic of Korea Registered Patent No. 10-2313725 (Oct. 12, 2021) "Fire-resistant foam gasket and fireproof damper including the same" Republic of Korea Registered Patent No. 10-2618175 (Dec. 21, 2023) "Air sealing damper capable of detecting and preventing leakage of sealing air" The problem to be solved

[0013] Accordingly, the objective of the present invention is to provide a damper valve having a structure in which an air sealing groove is formed in a landing bar, which can prevent fluid leakage by forming an air sealing groove inside a landing bar (seat) to which a sealing unit is in close contact and supplying air to the air sealing groove to form an air curtain with a small amount of air.

[0014] The objectives of the present invention are not limited to those mentioned above, and other unmentioned objectives will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0016] A damper valve according to the present invention, having a structure in which an air sealing groove is formed in a landing bar to achieve the purpose, comprises: a damper body having an inlet formed in the front portion and an outlet formed in the rear portion to form a flow path through which fluid is transferred from the inlet side to the outlet side; a landing bar continuously protruding along the inner circumference of the damper body; a rotating shaft rotatably coupled by penetrating the damper body vertically up and down; a blade coupled to the rotating shaft and rotating in conjunction with the rotation of the rotating shaft; and a sealing unit provided along the edge of the blade and in close contact with the landing bar to primarily prevent fluid leakage. In this damper, an air sealing groove is formed inside along the circumference of the landing bar, so that when the sealing unit is in close contact with the air sealing groove, the air supplied to the air sealing groove can secondarily prevent fluid leakage.

[0017] Here, the landing bar may have a structure in which it forms an annular shape and protrudes from the inner surface of the damper body, and the air sealing groove may be opened to one side of the landing bar. Additionally, an air supply channel is formed at one point of the air sealing groove to communicate with the outside, and an air injection unit may be provided on one side of the outer circumference of the damper body to inject air from the outside and supply it to the air sealing groove through the air supply channel.

[0018] At this time, the sealing unit may comprise an annular sealing member cover having a 'U' shape cross-section and coupled along the outer circumference of the blade, and a sealing member inserted into the sealing member cover and in close contact with the air sealing groove.

[0019] As another embodiment of the present invention, the landing bar may have a structure in which it is annular and protrudes from the inner surface of the damper body, and the air sealing groove is opened inward along the inner surface of the landing bar.

[0020] Here, an air supply channel is formed at one point of the air sealing groove to communicate with the outside, and an air injection unit may be provided on one side of the outer circumference of the damper body to inject air from the outside and supply it to the air sealing groove through the air supply channel.

[0021] And the sealing unit may comprise an annular sealing member cover that is coupled along the outer circumference of the blade and forms an insertion groove with a cross-section in the shape of a 'C', and a sealing member that is inserted into the insertion groove and in close contact with the air sealing groove. Effects of the invention

[0023] According to the present invention described above, even if primary sealing is achieved by a sealing member, slight leakage occurs due to the pressure of the working fluid. In the present invention, however, since the air supplied to the air sealing groove formed in the landing bar acts like an air curtain to perform secondary sealing, perfect sealing can be achieved. Brief explanation of the drawing

[0025] FIG. 1 is a front view showing a damper valve having a structure in which an air sealing groove is formed in a landing bar according to an embodiment of the present invention. FIG. 2 is a side view of the present invention illustrated in FIG. 1. FIG. 3 is an enlarged cross-sectional view of part A shown in FIG. 2. FIG. 4 is an operating state diagram of the present invention FIG. 5 is a front view showing a damper valve having a structure in which an air sealing groove is formed in a landing bar according to another embodiment of the present invention. FIG. 6 is a side view of the present invention illustrated in FIG. 5. FIG. 7 is an enlarged cross-sectional view of part B shown in FIG. 6. FIG. 8 is an operating state diagram of the present invention Specific details for implementing the invention

[0026] In the following, embodiments of the present invention are provided for a more accessible understanding of the present invention and do not limit the scope of the present invention. That is, the following embodiments are provided to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0027] Furthermore, the terms used herein are for describing embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components in addition to the components mentioned.

[0028] Furthermore, unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning that is commonly understood by those skilled in the art to which the present invention pertains. Also, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0029] In addition, when describing the present invention, if it is determined that a detailed description of related prior art could unnecessarily obscure the gist of the present invention, such detailed description may be omitted.

[0031] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0032] FIG. 1 is a front view showing a damper valve having a structure in which an air sealing groove is formed in a landing bar according to one embodiment of the present invention, and FIG. 2 is a side view of the present invention shown in FIG. 1.

[0033] Referring to the illustration, the present invention may be largely composed of a damper body (100), a landing bar (200), a rotating shaft (300), a blade (400), and a sealing unit (500).

[0034] First, a hydraulic motor or a pneumatic actuator may be provided on the outer side of the damper body (100) as a driving means for operating the rotation shaft (300), and the hydraulic motor or pneumatic actuator may automatically perform the opening and closing operation of the blade (400) by means of a control unit (not shown), and it is of course possible to manually operate the opening and closing operation of the blade (400) by rotating the handle by providing a handle (not shown).

[0035] Here, the present invention is preferably formed as a butterfly valve, and the butterfly valve is a valve that controls the flow rate of fluid flowing through a pipeline by rotating a plate-shaped valve disc disposed on the valve pipeline; it has a simple structure, is lightweight, operates quickly, and is widely used for fluids of high pressure as well as low pressure.

[0037] Specifically, as illustrated in FIG. 1, the damper body (100) is the basic body of the present invention, having an inlet (110) formed in the front portion for fluid to flow in and an outlet (120) formed in the rear portion for fluid to be discharged, and a flow path formed inside for fluid to be transferred from the inlet (110) side to the outlet (120) side.

[0038] To explain more specifically, the damper body (100) is configured to have a cylindrical body with a diameter of 200 mm or more, and a flange (130) is formed on the outer periphery of the front and rear portions where the inlet and outlet of the cylindrical body are formed, so as to be connected to pipes arranged on both sides of the flow path through the flange (130).

[0040] Next, with reference to FIG. 3, the landing bar (200), which is a key technical feature of the present invention, will be described. FIG. 3 shows an enlarged cross-sectional view of part A shown in FIG. 2.

[0041] The landing bar (200) is provided on the inner circumference of the damper body (100) and engages with the outer circumference of the sealing unit (500) described later to limit the rotation radius of the blade (400).

[0042] At this time, the landing bar (200) is formed to protrude inward from the inner surface of the damper body (100) in correspondence with the position of the blade (400) coupled to the rotation axis (300), and it is preferable that it is formed in correspondence with the shape of the blade (400).

[0043] According to a specific embodiment, as shown in FIGS. 1 and 2, it may be a structure formed in the shape of an annular flat plate, with the outer circumference coupled to the inner circumference of the damper body (100).

[0044] For reference, when the blade (400) is formed as a double structure, it is appropriate for the landing bar (110) to be formed as a pair and spaced apart from each other along the direction of fluid flow.

[0045] Importantly, an air sealing groove (210), such as a passage for air supplied from the outside, is formed inside the landing bar (200).

[0046] The air sealing groove (210) is formed concavely and continuously along the circumference of the landing bar (200). At this time, the opening of the air sealing groove (210) is formed on one side of the landing bar (200). Specifically, it is formed to face the sealing unit (500) described later, so that the air supplied to the air sealing groove (210) can be discharged toward the sealing unit (500).

[0047] An air supply path (220) is formed at one point of the air sealing groove (210) to connect the air sealing groove (210) with the outside.

[0048] The above air supply channel (220) is connected to an external air injection unit (140) to inject air into the air sealing groove (210) from the outside.

[0049] Specifically, the air injection unit (140) may be provided on one side of the outer circumference of the damper body (100).

[0050] The above air injection unit (140) may use an air nozzle as shown in the illustration, but is not limited thereto.

[0051] The end of the air injection unit (140) is hermetically connected to the inlet of the air supply path (220).

[0052] Accordingly, when air is supplied to the air sealing groove (210) by the air injection unit (140), high-pressure air flows along the air sealing groove (210) and can form an air curtain.

[0054] Next, the rotation axis (300) provides rotational force so that the blade (400), which will be described later, can rotate inside the damper body (100).

[0055] To this end, the rotation shaft (300) is rotatably coupled by penetrating the damper body (100).

[0056] The above-mentioned rotating shaft (300) is coupled to the above-mentioned blade (400), and the end of the above-mentioned rotating shaft (300), which is formed to extend outward from the above-mentioned damper body (100), is connected to a driving force providing means that provides rotational driving force, such as an electric motor, a hydraulic actuator, or a pneumatic actuator, so that it rotates by receiving rotational force from the driving force providing means, and as the above-mentioned rotating shaft (300) rotates, the above-mentioned blade (400) can rotate in conjunction with it.

[0058] Next, the above blade (400) will be described.

[0059] The blade (400) is coupled to the rotation axis (300) and rotates in conjunction with the rotation of the rotation axis (300).

[0060] The blade (400) has a shape corresponding to the cross-section of the damper body (100), may be a circular disc shape, and its outer diameter is formed to be smaller than the inner diameter of the damper body (100).

[0061] And the blade (400) may be provided as a single one as illustrated, but a pair may be provided. Also, during the process of rotating in conjunction with the rotation axis (300), the sealing unit (500) mounted on the outer periphery of the blade (400) comes into close contact with the landing bar (200), thereby limiting the rotation radius of the blade (400) and simultaneously closing the flow path, and opening the flow path by rotating in the opposite direction.

[0062] At this time, since the blade (400) must be made of a material that has excellent corrosion resistance and does not easily deform under high temperature and high pressure, the blade (400) is made of stainless steel, and more preferably, can be made of stainless steel 304 or 316.

[0064] Next, the sealing unit (500) is described.

[0065] The sealing unit (500) is formed continuously along the edge of the blade (400) and is in close contact with the landing bar (200) to perform primary sealing of the damper, and may be composed of a sealing member cover (510) and a sealing member (520).

[0066] The sealing member cover (510) is attached along the outer circumference of the blade, and its cross-section may be an angle shape such as approximately a 'C' as shown in the illustration.

[0067] And a sealing member (520) is fitted and coupled inside the sealing member cover (510).

[0068] The sealing member (520) contacts the landing bar (200) and, more precisely, is in close contact to cover the air sealing groove (210). Accordingly, it is preferable that the width of the sealing member (520) be formed to be larger than the width of the air sealing groove (210).

[0070] The operation state of the present invention described above will be explained below with reference to FIG. 4. FIG. 4 shows the operation state diagram of the present invention. Here, FIG. 4(a) is a cross-sectional view of the point where the air injection unit is installed, and FIG. 4(b) is a cross-sectional view of the air sealing groove. The arrow indicates the state of injecting air.

[0071] When the above-mentioned rotating shaft (300) is driven to close the damper body (100) with the blade (400), the sealing member (520) of the sealing unit (500) covers the air sealing groove (210) and comes into close contact with the landing bar (200).

[0072] In this state, as shown in FIG. 4(a), when air is injected through the air injection unit (140), it flows through the air supply path (220) and fills the inside of the air sealing groove (210).

[0073] Accordingly, as shown in FIG. 4 (b), the air filled in the air sealing groove (210) acts as an air curtain that forms pressure and blocks leakage of the working fluid.

[0074] That is, primary sealing is achieved by the close contact of the sealing member (520), and any leakage that may occur can be completely blocked by filling the air sealing groove (210) with air at a higher pressure than the working fluid to form an air curtain and perform secondary sealing.

[0076] Another embodiment of the present invention will be described below with reference to FIGS. 5 to 8. FIG. 5 is a front view showing a damper valve having a structure in which an air sealing groove is formed in a landing bar according to another embodiment of the present invention, FIG. 6 is a side view of the present invention shown in FIG. 5, FIG. 7 is an enlarged cross-sectional view of part B shown in FIG. 6, and FIG. 8 is an operating state diagram of the present invention.

[0077] In another embodiment of the present invention, the configuration of the damper body (100), rotation shaft (300), and blade (400) is substantially the same as that of the above-described embodiment, so a detailed description is omitted, and only the landing bar (200) and the sealing unit (500) in contact therewith, which differ therefrom, will be described.

[0078] As shown in FIGS. 5 and 6, the landing bar (200) is annular and is coupled to the inner circumference of the damper body (100) to form a shape that protrudes inward.

[0079] And the landing bar (200) has an inclined surface formed thereon to improve contact with the blade (400).

[0080] At this time, referring to FIG. 7, an air sealing groove (210) is formed concavely along the inner circumference of the landing bar (200). The opening of the air sealing groove (210) is formed to face inward, that is, toward the center of the damper body (100).

[0081] In addition, an air supply channel (220) is formed outwardly at one point of the air sealing groove (210), and an air injection unit (140) is installed on the outer circumference of the damper body (100), and the end of the air injection unit (140) is connected to the inlet of the air supply channel (220) so that air can be injected into the air sealing groove (210) from the outside through the air supply channel (220).

[0083] Next, the sealing unit (500) can be implemented as an annular sealing member cover (510) that is coupled to an angle shaped like a '┗' formed on the outer circumference of the blade (400) and has a cross-section shaped like a '┛', and a sealing member (520) that is coupled and fixed to an insertion groove (530) shaped like a '┗┛' formed inside the sealing member cover (510).

[0084] At this time, the sealing member (520) covers the air sealing groove (210) and adheres to the inclined surface of the landing bar (200) to perform airtight sealing.

[0085] Likewise, the air supplied to the air sealing groove (210) forms an air curtain and assists in the primary sealing of the sealing member (520) to perform secondary sealing.

[0087] Although the present invention has been described above with reference to the drawings according to embodiments thereof, those skilled in the art will be able to make various applications and modifications within the scope of the present invention based on the above description. Explanation of the symbols

[0089] 100 : Damper body 110 : Inlet 120 : Outlet 130 : Flange 140 : Air injection unit 200 : Landing bar 210 : Air sealing groove 220 : Air supply path 300 : Rotation axis 400: Blade 500 : Sealing unit 510 : Sealing component cover 520 : Sealing member 530 : Insertion groove

Claims

Claim 1 A damper body having an inlet formed on the front side and an outlet formed on the rear side, forming a fluid passage for transferring fluid from the inlet side to the outlet side; a landing bar continuously protruding along the inner circumference of the damper body; a rotating shaft rotatably coupled by penetrating the damper body vertically up and down; and a blade coupled to the rotating shaft and rotating in conjunction with the rotation of the rotating shaft. A damper valve having a structure in which an air sealing groove is formed in a landing bar, comprising: a sealing unit provided along the edge of the blade and in close contact with the landing bar to primarily prevent fluid leakage; wherein the damper comprises an annular air sealing groove continuously formed inside along the circumference of the landing bar and opening to one side, an air supply passage formed at one point of the air sealing groove to communicate with the outside of the air sealing groove, and an air injection unit provided on one side of the outer circumference of the damper body and connected to the air supply passage to supply air to the air sealing groove, wherein when the sealing unit is in close contact with the landing bar and covers the opening of the air sealing groove, air is supplied to the air sealing groove through the air injection unit, thereby forming an air curtain that creates pressure by filling the air sealing groove with air, thereby secondarily preventing fluid leakage in addition to the primary airtightness provided by the sealing unit. Claim 2 delete Claim 3 delete Claim 4 A damper valve having a structure in which an air sealing groove is formed in a landing bar, characterized in that, in claim 1, the sealing unit comprises an annular sealing member cover having a cross-section in the shape of a 'C' and coupled along the outer circumference of the blade, and a sealing member inserted into the sealing member cover and in close contact with the air sealing groove. Claim 5 A damper body having an inlet formed on the front side and an outlet formed on the rear side, forming a fluid passage for transferring fluid from the inlet side to the outlet side; a landing bar continuously protruding along the inner circumference of the damper body; a rotating shaft rotatably coupled by penetrating the damper body vertically up and down; and a blade coupled to the rotating shaft and rotating in conjunction with the rotation of the rotating shaft. A damper valve having a structure in which an air sealing groove is formed in a landing bar, comprising: a sealing unit provided along the edge of the blade and in close contact with the landing bar to primarily prevent fluid leakage; wherein the damper comprises an annular air sealing groove continuously formed to open inward along the inner circumference of the landing bar, an air supply passage formed at one point of the air sealing groove to communicate with the outside of the air sealing groove, and an air injection unit provided on one side of the outer circumference of the damper body and connected to the air supply passage to supply air to the air sealing groove, wherein when the sealing unit is in close contact with the landing bar and covers the opening of the air sealing groove, air is supplied to the air sealing groove through the air injection unit, thereby filling the air inside the air sealing groove to form an air curtain that creates pressure, thereby secondarily preventing fluid leakage in addition to the primary airtightness provided by the sealing unit. Claim 6 delete Claim 7 A damper valve having a structure in which an air sealing groove is formed in a landing bar, characterized in that, in claim 5, the sealing unit comprises an annular sealing member cover that is coupled along the outer circumference of the blade and forms an insertion groove having a cross-section in the shape of a 'C', and a sealing member that is inserted into the insertion groove and is in close contact with the air sealing groove.

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