Supply and exhaust pipe assembly with multiple sealing structures

Abstract

The present invention relates to a supply and exhaust pipe assembly having a multi-sealed structure designed to prevent the inflow of condensate or external moisture by hermetically sealing the gap between a first hollow tube and a second hollow tube, so as to discharge exhaust gas combusted from a boiler body to the outside and supply external air to the inside of the boiler, wherein the supply and exhaust paths are formed in a double structure. The assembly comprises: a first hollow tube; a second hollow tube inserted obliquely into the interior of the first hollow tube such that both ends protrude outside the ends of the first hollow tube; a first sealing plate made of metal that blocks the space between both ends of the first hollow tube and the second hollow tube; and a second sealing plate made of silicone rubber that is installed in a state of being superimposed on the outward surface of the first sealing plate.

Description

Technology Field

[0001] The present invention relates to a supply and exhaust pipe assembly having a multi-sealed structure, and more specifically, to a supply and exhaust pipe assembly having a multi-sealed structure designed to prevent the inflow of condensate or external moisture by hermetically sealing the gap between a first hollow tube and a second hollow tube so as to discharge exhaust gas combusted from a boiler body to the outside and supply external air into the boiler. Background Technology

[0003] Generally, a condensing boiler is a high-efficiency boiler that improves thermal efficiency by recovering the latent heat of exhaust gases generated during combustion to heat the heating water once more.

[0004] While this condensing method lowers the exhaust temperature, condensation may occur inside the second hollow tube, and if this is discharged to the outside, there is a risk of causing environmental or structural contamination.

[0005] Accordingly, the second hollow tube is positioned at an angle with the outer end higher than the inner end, and as a result, there is a possibility that rainwater, melted snow, etc. from the outside may flow into the interior along the second hollow tube.

[0006] In addition, if the space between the first hollow tube and the second hollow tube is not properly sealed, air leakage or backflow may occur, which can lead to reduced combustion efficiency and safety accidents.

[0007] Conventional structures used sealing members or rubber packings, but problems arose such as complex assembly or corrosion or deformation during long-term use.

[0008] Therefore, a structural means is required to easily and airtightly seal the space between the first hollow tube and the second hollow tube in a double-tube structure.

[0009] In particular, there is a need for technology that secures structural rigidity and flexibility through a combination of metal and silicone rubber materials, and can reliably protect the inside of the chimney from condensation or moisture ingress.

[0010] Accordingly, the present invention aims to provide a double-channel structure that is easy to assemble, has excellent durability, and can simultaneously ensure airtightness and waterproofness.

[0011] Meanwhile, the aforementioned background technology is technical information that the inventor possessed for the derivation of the present invention or acquired during the process of deriving the present invention, and it cannot necessarily be considered publicly known technology disclosed to the general public prior to the filing of the present invention. Prior art literature

[0013] Korean Patent Publication No. 10-2000-0026730 (Published May 15, 2000) The problem to be solved

[0014] One aspect of the present invention provides a supply and exhaust pipe assembly having a multi-sealed structure that can simultaneously ensure airtightness, water resistance, and durability while structurally sealing the space between the first hollow tube and the second hollow tube in a structure in which a second hollow tube is inserted obliquely into a first hollow tube.

[0015] The technical problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0017] A supply and exhaust pipe assembly having a multi-sealed structure according to one embodiment of the present invention comprises: a first hollow tube; a second hollow tube inserted obliquely into the interior of the first hollow tube such that both ends protrude outside the ends of the first hollow tube; a first sealing plate made of metal that blocks the space between both ends of the first hollow tube and the second hollow tube; and a second sealing plate made of silicone rubber that is installed in a state of being superimposed on the outward surface of the first sealing plate.

[0018] In one embodiment, the first sealing plate and the second sealing plate may include: a circular blocking plate having a diameter equal to the inner diameter of the first hollow tube; an outer flange bent at the edge of the blocking plate and in close contact with the inner diameter surface of the first hollow tube; a second hollow tube through hole penetrating the inside of the blocking plate to have a diameter equal to the outer diameter of the second hollow tube; and the inner flange bent at the edge of the second hollow tube through hole and in close contact with the outer diameter surface of the second hollow tube.

[0019] In one embodiment, a supply and exhaust pipe assembly having a multi-sealed structure according to another embodiment of the present invention may further include a flow rate control unit installed on the inner side of the second hollow tube to control the flow rate of exhaust gas passing through the second hollow tube.

[0020] In one embodiment, the flow rate control unit comprises: a horizontal support installed along the internal space of the second hollow tube; a rotating sleeve rotatably installed on the horizontal support; a rotary drive gear installed on the inner side of the horizontal support that engages with a gear tooth formed along the inward surface of the rotating sleeve to rotate the rotating sleeve; a plurality of support frames spaced apart along the circumference of the rotating sleeve and connected rotatably to be seated on the horizontal support; a resistance wing formed by bending into a round shape and installed on the support frame to cover and seat the horizontal support, which moves together with the support frame as it separates from the horizontal support to reduce the flow rate of exhaust gas moving along the internal space of the second hollow tube; a cylinder spaced apart from the rotating sleeve in the direction of exhaust gas movement and installed horizontally on the inner side of the horizontal support; and a rotary support unit installed and supported at the front end of the cylinder, which moves forward toward the rotating sleeve as the cylinder extends and moves backward toward the rotating sleeve as the cylinder contracts. and a plurality of frame unfolding members are spaced apart and installed between the rotating sleeve and the rotating support member, facing the support frame, and may include a frame unfolding member that lifts the support frame from the horizontal support member as the rotating support member moves forward.

[0021] In one embodiment, the rotational support may include: a support ring formed in a circular ring shape and arranged to be movable in the front-rear direction within the horizontal support; a rotational ring formed in a circular ring shape and connected to be rotatably installed by overlapping the front end of the support ring opposite the rotational sleeve; and a ring support installed across the inner side of the support ring and installed on the cylinder, which moves the support ring as the cylinder extends or contracts.

[0022] In one embodiment, the frame unfolding member may include: a link seating groove extending along the horizontal support member; a first link rotatably connected to the rear end of the rotating sleeve facing the cylinder and positioned in the link seating groove; a second link rotatably connected to the rear end of the first link and the front end of the rotating ring, respectively, and lifting the rear end of the first link from the link seating groove as the rotating ring moves forward; and a third link, the lower end of which is connected together with both the first link and the second link, the upper end of which is connected to the support frame, and which rises together with the rear end of the first link as it is lifted from the link seating groove, thereby lifting the support frame.

[0023] In one embodiment, the resistance wing may include: a fixed wing formed by bending into a round shape and fixedly installed on the support frame; an additional wing, one end of which is rotatably connected to the fixed wing and is seated over the fixed wing, and which increases the contact area with the exhaust gas as it unfolds from the fixed wing; and a wing support electromagnet that supports one edge of the additional wing while it is overlaid on the fixed wing, and which engages the additional wing when an opposite polarity is formed with the additional wing through electrical switching, and induces rotation of the additional wing to unfold the additional wing from the fixed wing when an equal polarity is formed with the additional wing. Effects of the invention

[0025] According to one aspect of the present invention described above, by installing a first sealing plate made of metal material between both ends of the first hollow tube and the second hollow tube, leakage of air and exhaust gas can be prevented through a structure resistant to thermal deformation, and airtightness and durability of the entire structure can be secured.

[0026] In addition, by placing a second sealing plate made of silicone rubber material over the outside of the first sealing plate, moisture and dust entering from the outside can be blocked twice, and the sealing condition is maintained due to the elasticity of the rubber material even during long-term operation.

[0027] Since this structure allows for fixation by insertion alone without the need for separate complex fasteners during assembly, it can improve productivity and ease of maintenance, and maintain stable sealing performance without concerns regarding corrosion or deformation of the rubber material.

[0028] The effects of the present invention are not limited to those mentioned above, and various effects may be included within the scope obvious to a person skilled in the art from the contents described below. Brief explanation of the drawing

[0030] FIG. 1 is a diagram showing the schematic configuration of a supply and exhaust pipe assembly having a multi-sealed structure according to one embodiment of the present invention. Figure 2 is a drawing showing the first sealing plate of Figure 1. Figure 3 is a drawing showing the second sealing plate of Figure 1. FIG. 4 is a diagram showing the schematic configuration of a supply and exhaust pipe assembly having a multi-sealed structure according to another embodiment of the present invention. Figures 5 and 6 are drawings showing the detailed configuration of the rotating support and the frame unfolding part of Figure 4. Figure 7 is a drawing showing the detailed configuration of a resistance wing linked to the frame unfolding section of Figure 4. Specific details for implementing the invention

[0031] The following detailed description of the invention refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that various embodiments of the invention are different but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in relation to one embodiment. It should also be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the invention. Accordingly, the following detailed description is not intended to be limiting, and the scope of the invention is limited only by the appended claims, including all equivalents to those claimed therein, provided they are appropriately described. Similar reference numerals in the drawings refer to the same or similar functions across various aspects.

[0032] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

[0033] FIG. 1 is a diagram showing the schematic configuration of a supply and exhaust pipe assembly having a multi-sealed structure according to one embodiment of the present invention.

[0034] Referring to FIG. 1, a supply and exhaust pipe assembly (1) having a multi-sealed structure according to one embodiment of the present invention includes a first hollow pipe (10), a second hollow pipe (20), a first sealing plate (30), and a second sealing plate (40).

[0035] The first hollow tube (10) is configured to allow external air to be introduced into the interior when the boiler is in operation, and is extended in the longitudinal direction along the central axis of the entire flue.

[0036] The first hollow tube (10) supports the entire structure of the flue, forms a space into which the second hollow tube (20) can be inserted, and provides a stable inflow path for external air.

[0037] The second hollow tube (20) is configured to be inserted obliquely into the interior of the first hollow tube (10) such that both ends protrude out of both ends of the first hollow tube (10), and performs the function of releasing exhaust gas after combustion to the outside.

[0038] The second hollow tube (20) is arranged at a different angle to the central axis from the first hollow tube (10), thereby minimizing interference between the supply and exhaust and improving combustion efficiency and exhaust stability.

[0039] The first sealing plate (30) is a metal component installed to block the space between both ends of the first hollow tube (10) and the second hollow tube (20), and is fixed in close contact with the end of the first hollow tube (10).

[0040] The first sealing plate (30) is installed around the second hollow tube (20) to prevent leakage of air and gas inside the double pipe and to provide structural rigidity.

[0041] The second sealing plate (40) is made of silicone rubber and is installed in a state where it overlaps the outer surface of the first sealing plate (30), providing an additional sealing means to prevent external air or moisture from entering.

[0042] The second sealing plate (40) is made of a silicone material with excellent elasticity and sealing properties, and by completely blocking the joint between the first sealing plate (30) and the outside, it contributes to strengthening the durability and airtightness of the entire pipe.

[0043] A supply and exhaust pipe assembly (1) having a multi-sealed structure according to one embodiment of the present invention having the configuration described above can maintain the supply and exhaust paths independently while ensuring airtightness and safety within the structure, thereby maximizing the combustion efficiency of the boiler and ensuring long-term operational safety.

[0045] In one embodiment, the first sealing plate (30) and the second sealing plate (40) may include a circular blocking plate (31, 41), an outer flange (32, 42), a second hollow tube passage hole (33, 43), and an inner flange (34, 44).

[0046] The circular blocking plates (31, 41) are formed in a circular shape having the same diameter as the inner diameter of the first hollow tube (10), and form the basic structure of the first sealing plate (30) and the second sealing plate (40).

[0047] The circular blocking plate (31, 41) is designed to be inserted and installed inside the end of the first hollow tube (10) so as to effectively close the entire internal cross-section of the first hollow tube.

[0048] The outer flange (32, 42) is formed by being bent inward from the edge of the blocking plate (31, 41) and is installed in close contact with the inner diameter surface of the first hollow tube (10).

[0049] The outer flange (32, 42) utilizes the elasticity of the metal and silicone materials to enable airtight sealing against the inner wall of the first hollow tube and increases the effect of blocking external gas or moisture.

[0050] The second hollow tube passage hole (33, 43) is a through hole formed in the inner center of the circular blocking plate (31, 41) and has a diameter equal to the outer diameter of the second hollow tube (20).

[0051] The second hollow tube passage hole (33, 43) is formed so that the second hollow tube (20) can be installed by penetrating the blocking plate, and is precisely coupled with the second hollow tube passing through the center of the blocking plate to prevent detachment.

[0052] The inner flange (34, 44) is formed by being bent at the edge of the second hollow tube passage hole (33, 43) and is in close contact with the outer diameter surface of the second hollow tube (20).

[0053] The inner flange (34, 44) prevents leakage of air or harmful gas through airtight contact with the second hollow tube and strengthens structural fixation to maintain stable fixation even with vibration or thermal expansion of the device.

[0054] A supply and exhaust pipe assembly (1) having a multi-sealed structure including a first sealing plate (30) and a second sealing plate according to one embodiment of the present invention having the configuration described above has the effect of maintaining the effect of blocking leakage and harmful gases even during long-term use by maximizing airtightness and structural stability between the first hollow pipe and the second hollow pipe.

[0056] FIG. 4 is a diagram showing the schematic configuration of a supply and exhaust pipe assembly having a multi-sealed structure according to another embodiment of the present invention.

[0057] Referring to FIG. 4, a supply and exhaust pipe assembly (2) having a multi-sealed structure according to another embodiment of the present invention includes a first hollow pipe (10), a second hollow pipe (20), a first sealing plate (30), a second sealing plate (40), and a flow rate control unit (50).

[0058] Here, the first hollow tube (10), the second hollow tube (20), the first sealing plate (30), and the second sealing plate (40) are identical to the components of FIG. 1, so their descriptions are omitted to avoid duplication of descriptions.

[0059] The flow rate control unit (50) is a component installed inside the second hollow tube (20) and performs the function of controlling the flow rate of air and exhaust gas flowing in or out through the second hollow tube.

[0060] The flow rate control unit (50) can be fixedly or variably mounted at a specific location along the length direction of the second hollow tube (20), and by variably forming flow resistance, it enables optimal flow rate control suitable for combustion conditions.

[0061] The flow rate control unit (50) can be formed in a curved or wing shape so as not to affect the flow of exhaust gas flowing inside the second hollow tube, and can be implemented in a manual or automatic control manner depending on the operating conditions of the boiler.

[0062] This configuration can reduce thermal interference between the supply and exhaust air and maximize the preheating effect of the supply air through heat conduction via the outer surface of the second hollow tube (20).

[0063] In one embodiment, the flow rate control unit (50) may include a horizontal support (100), a rotating sleeve (200), a rotating drive gear (300), a support frame (400), a resistance wing (500), a cylinder (600), a rotating support (700), and a frame unfolding unit (800).

[0064] The horizontal support (100) is configured to be arranged longitudinally along the internal space of the second hollow tube (20) and serves as the central structure of the entire flow rate control unit.

[0065] The horizontal support (100) provides a support surface so that various components can be precisely fixed inside, and is formed in a shape that does not obstruct the flow of exhaust gas flowing inside the second hollow tube.

[0066] The rotating sleeve (200) is a configuration that is rotatably installed on a horizontal support (100) and performs the function of receiving external driving force using internal gear teeth and converting it into rotational motion.

[0067] The rotating sleeve (200) is formed in a cylindrical shape and installed to surround the outer surface of the horizontal support (100), and acts as a central element that mediates the rotational operation of the flow rate control unit.

[0068] The rotary drive gear (300) is installed on the inner side of the horizontal support (100) and is configured to drive the rotary sleeve (200) by engaging with the gear teeth formed along the inward surface of the rotary sleeve (200).

[0069] The rotary drive gear (300) is rotated by an external power source such as a motor or cylinder, and enables position adjustment of the support frame (400) and resistance wing (500) through precise rotation of the rotary sleeve (200).

[0070] A plurality of support frames (400) are spaced apart along the circumference of the rotating sleeve (200), and each frame is connected and installed so as to be rotatable and is seated on the horizontal support (100).

[0071] The support frame (400) provides stable support for each component and, at the same time, induces the operation of the wing structure positioned along the outer side of the rotating sleeve (200) through interaction with the rotating support part (700) and the frame unfolding part (800).

[0072] The resistance wing (500) is formed by bending into a round shape and is installed on the support frame (400), covering and resting on the horizontal support (100).

[0073] The resistance wing (500) is lifted and moved together as the support frame (400) is separated from the horizontal support (100), and slows down the flow rate of exhaust gas flowing along the inside of the second hollow tube (20), thereby contributing to flow rate stabilization and improved heat exchange efficiency.

[0074] The cylinder (600) is configured to be installed horizontally at a position spaced apart from the rotating sleeve (200) in the direction of exhaust gas movement, and performs forward and backward movement through external driving.

[0075] The cylinder (600) supports the rotational support member (700) at the front and induces flow rate control operation by controlling internal and external pressure.

[0076] The rotating support member (700) is configured to be installed and supported at the front end of the cylinder (600), and moves forward in the direction of the rotating sleeve (200) as the cylinder (600) extends, and moves backward as it contracts.

[0077] The rotating support member (700) organically links the operation of the entire flow rate control unit and acts as a key element that performs structural development together with the frame development unit (800).

[0078] A plurality of frame unfolding sections (800) are spaced apart and installed so as to face the support frame (400) between the rotating sleeve (200) and the rotating support section (700).

[0079] The frame deployment unit (800) lifts the support frame (400) from the horizontal support (100) according to the forward movement of the rotational support unit (700), and induces the resistance wing (500) to intervene in the internal flow path, thereby reducing the flow velocity.

[0080] A supply and exhaust pipe assembly (2) having a multi-sealed structure including a flow rate control unit (50) according to one embodiment of the present invention having the configuration described above has the effect of minimizing heat loss and maximizing the operating efficiency and stability of the boiler by actively controlling the flow rate of exhaust gas through a rotation and sliding mechanism and automatically expanding it.

[0081] A supply and exhaust pipe assembly (1) having a multi-sealed structure including a flow rate control unit (50) according to one embodiment of the present invention having the configuration described above has the effect of improving thermal efficiency by appropriately controlling the flow rate of exhaust gas and maximizing the energy saving effect of the boiler along with combustion stability.

[0083] Figures 5 and 6 are drawings showing the detailed configuration of the rotating support and the frame unfolding part of Figure 4.

[0084] Referring to FIGS. 5 and 6, a rotating support member (700) according to one embodiment of the present invention includes a support ring (710), a rotating ring (720), and a ring support (730).

[0085] The support ring (710) is configured to be in the shape of a circular ring and positioned so as to be able to slide in the forward and backward directions on the inner side of the horizontal support (100).

[0086] The support ring (710) moves forward and backward according to the driving force of the cylinder (600) and acts as a central structure that guides the operating direction of the frame unfolding part (800).

[0087] The support ring (710) is aligned axially within the entire flow rate control section and can be designed to be streamlined so as not to obstruct the exhaust gas flow.

[0088] The rotating ring (720) is formed in a circular ring shape and is connected and installed so as to be rotatable by being overlapped with the front end of the supporting ring (710) facing the rotating sleeve (200).

[0089] The rotating ring (720) is configured to induce or absorb rotational movement of the support ring (710), maintains alignment with the rotating sleeve (200), and supports smooth rotation of the flow rate control operation.

[0090] This configuration can ensure stability of the unfolding operation by mitigating vibrations or twisting that may occur during rotation of the rotating sleeve (200).

[0091] The ring support (730) is installed across the inner side of the support ring (710) and is configured to be connected and fixed to the cylinder (600).

[0092] The ring support (730) serves to move the support ring (710) in the forward and backward directions as the cylinder (600) extends or retracts, and acts as a medium to transmit the driving force of the cylinder.

[0093] Additionally, the ring support (730) guides the forward and backward movement of the support ring (710) along a limited path and provides stable position return and alignment functions even during repeated operation.

[0094] A supply and exhaust pipe assembly (1) having a multi-sealed structure including a rotating support member (700) according to one embodiment of the present invention having the configuration described above provides the effect of being structurally reinforced to increase the operational precision between the rotating sleeve and the frame unfolding member when controlling the flow rate, and to stably perform the flow rate control operation through automatic unfolding.

[0096] Referring to FIGS. 5 and 6, a frame unfolding unit (800) according to one embodiment of the present invention includes a link seating groove (810), a first link (820), a second link (830), and a third link (840).

[0097] The link seating groove (810) is formed to extend along the horizontal support (100), and is provided so that the first link (820) can be stably seated on the outer side of the horizontal support (100).

[0098] The link seating groove (810) is designed to prevent the first link (820) from moving out of position during operation and to maintain the link alignment state in the initial standby state.

[0099] The first link (820) is configured to be rotatably connected to the rear end of a rotating sleeve (200) installed at a position opposite to the cylinder (600).

[0100] The first link (820) is placed in the link seating groove (810) and remains in a standby state in close contact with the horizontal support (100) until an external force is transmitted.

[0101] The second link (830) is configured to be rotatably connected to the rear end of the first link (820) and the front end of the rotating ring (720), respectively.

[0102] The second link (830) operates in conjunction with the forward movement of the rotating ring (720) and performs the function of lifting the rear end of the first link (820) from the link seating groove (810).

[0103] The second link (830) amplifies the driving distance and force of the rotating ring (720) as a mechanical advantage, causing the rear end of the first link (820) to detach from the horizontal support (100).

[0104] The third link (840) is configured such that its lower end is connected to both the first link (820) and the second link (830), and its upper end is connected to the support frame (400).

[0105] The third link (840) serves to lift the support frame (400) as it rises together with the rear end of the first link (820) when it is lifted from the link seating groove (810).

[0106] The third link (840) serves as the final transmission point for the entire frame deployment operation, thereby separating the support frame (400) from the horizontal support (100) and guiding it to the operating position of the resistance wing (500), thereby realizing flow rate control.

[0107] A supply and exhaust pipe assembly (1) having a multi-sealed structure including a frame unfolding unit (800) according to one embodiment of the present invention having the configuration described above has the effect of providing high structural reliability and control efficiency that can actively control the flow rate of exhaust gas by precisely implementing the unfolding operation of the support frame through a multi-stage link operation structure according to cylinder driving.

[0109] Figure 7 is a drawing showing the detailed configuration of a resistance wing linked to the frame unfolding section of Figure 4.

[0110] Referring to FIG. 7, a resistance wing (500) according to one embodiment of the present invention includes a fixed wing (510), an additional wing (520), and a wing support electromagnet (530).

[0111] The fixed wing (510) is formed by bending into a round shape and is fixedly installed on the support frame (400), thereby forming the basic structure of the resistance wing (500).

[0112] The fixed wing (510) is positioned to wrap around the horizontal support (100) and is structured to come into direct contact with the airflow within the internal space of the second hollow tube (20), thereby performing the function of reducing the flow velocity of the exhaust gas.

[0113] Additionally, the fixed wing (510) acts as a main member that suppresses structural vibration in a fixed state and provides flow resistance with the rise or fall of the support frame (400).

[0114] The additional wing (520) is configured such that one end is rotatably connected to the fixed wing (510), and normally sits overlapping the fixed wing (510).

[0115] When the additional wing (520) is deployed from the fixed wing (510), it expands the surface area of ​​the entire wing structure and increases the contact area with the exhaust gas moving along the second hollow tube (20), thereby effectively lowering the flow velocity.

[0116] The additional wing (520) can be formed of a lightweight metal or heat-resistant polymer material and is designed to be oriented in a direction that maximizes fluid resistance when deployed.

[0117] The wing support electromagnet (530) is configured to support one edge of an additional wing (520) that is overlapped with a fixed wing (510).

[0118] The wing support electromagnet (530) operates via electrical switching and, when forming opposite polarity with the additional wing (520), adsorbs and supports the additional wing (520) so that it is in close contact with the fixed wing (510).

[0119] On the other hand, when the same polarity is formed, the rotation of the additional wing (520) is induced, causing the additional wing (520) to naturally unfold from the fixed wing (510), thereby activating the flow rate control function.

[0120] The wing support electromagnet (530) can control the flow rate with simple electrical control alone, contributing to system automation and improved energy efficiency.

[0121] A supply and exhaust pipe assembly (1) having a multi-sealed structure including a resistance wing (500) according to one embodiment of the present invention having the configuration described above can actively adjust the flow rate resistance by electromagnetic control as well as mechanical link driving, thereby having the effect of improving the thermal efficiency and operational safety of the boiler while flexibly responding to changes in external conditions.

[0123] The embodiments described above are for illustrative purposes only, and those skilled in the art will understand that the embodiments described above can be easily modified into other specific forms without altering the technical concept or essential features of the embodiments described above. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0125] The scope of protection sought through this specification is defined by the claims set forth below rather than by the detailed description above, and should be interpreted to include all modifications or variations derived from the meaning and scope of the claims and the concept of equivalents. Explanation of the symbols

[0127] 1, 2: Supply and exhaust duct assembly having a multi-sealed structure 10: 1st Chinese Embassy 20: 2nd Chinese Embassy 30: First sealing plate 40: Second sealing plate 50: Flow rate control unit

Claims

Claim 1 A first hollow tube; a second hollow tube inserted obliquely into the interior of the first hollow tube such that both ends protrude outside the ends of the first hollow tube; a first sealing plate made of metal that blocks the space between both ends of the first hollow tube and the second hollow tube; and a second sealing plate made of silicone rubber installed in a superimposed state on the outward surface of the first sealing plate; and a flow rate control unit installed on the inner side of the second hollow tube to control the flow rate of exhaust gas passing through the second hollow tube; wherein the flow rate control unit comprises: a horizontal support installed along the inner space of the second hollow tube; a rotating sleeve rotatably installed on the horizontal support; a rotary drive gear installed on the inner side of the horizontal support that engages with a gear tooth formed along the inward surface of the rotating sleeve to rotate the rotating sleeve; a plurality of support frames spaced apart along the circumference of the rotating sleeve and connected rotatably to be seated on the horizontal support; a resistance wing formed by bending into a round shape and installed on the support frame to cover and seat the horizontal support, which moves together with the support frame as it separates from the horizontal support to reduce the flow rate of exhaust gas moving along the inner space of the second hollow tube; a cylinder spaced apart from the rotating sleeve in the direction of exhaust gas movement and installed horizontally on the inner side of the horizontal support; and a cylinder installed and supported at the front end of the cylinder, which advances in the direction of the rotating sleeve as the cylinder extends. A rotating support member that moves backward in a direction away from the rotating sleeve as the cylinder is driven to contract; and a plurality of frame unfolding members spaced apart and installed between the rotating sleeve and the rotating support member, facing the support frame, and lifting the support frame from the horizontal support as the rotating support member moves forward;A supply and exhaust pipe assembly having a multi-sealed structure, comprising: a support ring formed in a circular ring shape and arranged to be movable in the front-rear direction within the horizontal support member; a rotating ring formed in a circular ring shape and connected to be rotatably installed by overlapping it at the front end of the support ring facing the rotating sleeve; and a ring support installed across the inner side of the support ring and installed on the cylinder, which moves the support ring as the cylinder extends or retracts. Claim 2 delete

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