Flue non-return fire damper and flue system having the same

Abstract

The present invention discloses a flue non-return fire damper and a flue system having the same, comprising a mounting plate with a through hole, an air inlet channel provided on the front of the mounting plate, an air outlet end face correspondingly provided on the back of the mounting plate, an air outlet provided on the air outlet end face, a valve seat provided on the air outlet end face, a rotatable valve disc hinged on the valve seat that can only be opened in the air outlet direction; a high-temperature closing device with a locking mechanism that can force the valve disc to close toward the air inlet side at a set temperature is provided on the air outlet end face through a bracket, so that the valve disc is always in a closed state; a spring corresponding to the valve disc is provided on the bracket, and the spring is located on the back side of the valve disc. In the present invention, since the valve disc and the high-temperature closing device are respectively mounted on the air outlet end face through the valve seat and the bracket, it is convenient to install and adjust the valve disc and the high-temperature closing device, and there will be no mutual interference between the two. A spring corresponding to the valve disc is provided on the bracket to ensure that the valve disc can be closed in a timely and easy manner.

Description

Technical Field

[0001] The present invention relates to a flue non-return fire damper used in a kitchen using a public flue and a flue system having the same. Background Art

[0002] In kitchens using a longitudinal public flue, a device such as a flue check fire damper is typically installed between the range hood's exhaust pipe and the public flue to prevent fumes from flowing back into the kitchen. Existing flue check fire dampers typically include a flue formed by a housing, with an air inlet and an outlet facing each other. The air inlet is connected to the range hood's exhaust pipe, and the outlet extends into the public flue. A single or double valve disc is hinged to the flue via a valve disc pivot. A high-temperature shutoff device is installed on the outlet side to force the valve disc closed. When the range hood is not in use, the valve disc is in a closed position due to its own gravity, covering the outlet. When the range hood is in use, the valve disc is in an open position, away from the outlet. However, the existing valve disc and high-temperature closing device are installed on the same bracket, making it inconvenient to manufacture and adjust them, and may also interfere with each other. At the same time, the existing valve disc closes by its own gravity, and when the public flue is under negative pressure, the valve disc cannot close in time. In addition, the existing flue check fire damper is generally installed on the flue air inlet by an elastic clip or elastic plate provided on the shell of the shell facing the air outlet. This installation method causes the flue check fire damper to be loosened and not tightly attached to the flue wall. Another installation method is to drill a hole in the flue wall and install the flue check fire damper on the flue air inlet with screws. This installation method is prone to damaging the tiles on the flue wall, causing the tiles to break or crack. All of the above methods are inconvenient to install and replace the flue check fire damper.

[0003] Furthermore, because multiple households share a common vertical flue duct, if a fire breaks out in a household, a large amount of high-temperature, harmful gases will flow into the vertical common flue duct. If the valve disc in the flue check fire damper is not closed promptly, these high-temperature, harmful gases will enter the home of the user using the range hood through the flue check fire damper's smoke passage, threatening the lives of the residents. Existing flue check fire dampers are equipped with a high-temperature closing device on the outer end surface of the air outlet that forces the valve disc to close toward the air inlet at a set temperature. When the flue gas temperature in the common flue duct reaches a high emergency temperature, the high-temperature closing device forcibly closes the open valve disc. However, the high-temperature closing device on existing flue check fire dampers uses a spring to close the valve disc. If the high temperature in the common flue duct persists for a certain period of time, the spring will fail due to the high temperature, and the valve disc will lose its restraining force and open again, causing high-temperature, harmful gases to flow into the user's home, threatening the lives of the residents. Summary of the Invention

[0004] The first technical problem to be solved by the present invention is to provide a flue non-return fire damper with an easy-to-install and adjust valve plate; the second technical problem to be solved by the present invention is to provide a flue non-return fire damper with an easy-to-close valve plate; at the same time, the flue non-return fire damper is easy to install and fix on the public flue, and can be forcibly closed in an emergency state when the smoke temperature in the public flue is very high, and the valve plate of the fire damper is always in a closed state; another technical problem to be solved by the present invention is to provide a flue system with the above-mentioned flue non-return fire damper.

[0005] In order to solve the first technical problem mentioned above, the present invention includes a mounting plate with a through hole, and its structural feature is that an air intake channel is provided on the front of the mounting plate, an air outlet is provided in the air intake channel, a valve seat is provided in the air intake channel or on the mounting plate, and a rotatable valve plate that can only be opened in the air outlet direction is hinged on the valve seat; a high-temperature closing device with a locking mechanism that can force the valve plate to close toward the air inlet side at a set temperature is provided in the air intake channel or on the mounting plate through a bracket, so that the valve plate is always in a closed state.

[0006] Or the present invention includes a mounting plate with a through hole, and its structural feature is that an air inlet channel is provided on the front of the mounting plate, an air outlet end face is correspondingly provided on the back of the mounting plate, an air outlet end face is provided on the air outlet end face, an air outlet is provided on the air outlet end face or the mounting plate, and a valve seat is hinged on the valve seat to be able to rotate and can only be opened in the air outlet direction; a high-temperature closing device with a locking mechanism is provided on the air outlet end face or the mounting plate through a bracket, which can force the valve plate to close toward the air inlet side at a set temperature, so that the valve plate is always in a closed state.

[0007] The valve seat is arranged at the left and right middle position of the outer end surface of the air outlet end surface or the back of the installation plate. There are two valve seats arranged at intervals up and down, and the valve plate is hinged to the valve seat through a pin shaft or a hinge shaft.

[0008] In order to solve the second technical problem mentioned above, the present invention includes a mounting plate with a through hole, and its structural feature is that an air intake channel is provided on the front of the mounting plate, an air outlet is provided in the air intake channel, and a rotatable valve plate that can only be opened in the air outlet direction is provided in the air intake channel or on the mounting plate; a high-temperature closing device with a locking mechanism that can force the valve plate to close toward the air inlet side at a set temperature is provided in the air intake channel or on the mounting plate through a bracket, so that the valve plate is always in a closed state, and a spring corresponding to the valve plate is provided on the bracket, and the spring is located on the back side of the valve plate.

[0009] Or the present invention includes a mounting plate with a through hole, and its structural feature is that an air inlet channel is provided on the front of the mounting plate, an air outlet end face is correspondingly provided on the back of the mounting plate, an air outlet end face is provided on the air outlet end face, and an air outlet is provided on the air outlet end face or the mounting plate. A rotatable valve plate that can only be opened in the air outlet direction is provided; a high-temperature closing device with a locking mechanism that can force the valve plate to close toward the air inlet side at a set temperature is provided on the air outlet end face or the mounting plate through a bracket, so that the valve plate is always in a closed state, and a spring corresponding to the valve plate is provided on the bracket, and the spring is located on the back side of the valve plate.

[0010] The two springs are symmetrically arranged on the left and right sides, and are fixed on the bracket by screws or rivets. The two springs have the resilience to close the valve plate.

[0011] A deflector is provided on the back of the mounting plate, and fire damper locking pieces are symmetrically provided on the back of the mounting plate within the left and right walls of the deflector. Hook grooves for extending the fire damper locking pieces are provided on the left and right walls of the deflector.

[0012] The fire damper locking member includes a limiting sleeve fixedly mounted on the back of the mounting plate, and a bolt is provided in the limiting sleeve and penetrates from the front of the mounting plate. A hook is screwed to the inner end of the bolt, and the hook extends relatively outward from the hook groove. The hook is pulled and clamped on the inner wall of the flue by the bolt.

[0013] The hook groove is in a corner shape, and has a horizontally arranged straight groove section and a vertical groove section arranged vertically upward along the inner end of the straight groove section. The straight groove section and the vertical groove section of the hook groove have a smooth transition.

[0014] The outer end of the hook is provided with a raised hook head, and the raised hook head faces the installation plate.

[0015] The high-temperature closing device with a locking mechanism includes a support shaft installed on a bracket, a locking pressure plate is installed on the support shaft, a pressure plate compression spring is installed on the support shaft, and a hot melt sheet or a separable bimetallic sheet that can melt at a set temperature and extends toward the locking pressure plate is provided on the bracket. The pressure strip locking pressure plate is interlocked with the hot melt sheet or bimetallic sheet.

[0016] The support shaft is hinged with a valve strip at one end close to the valve disc, and the locking pressure plate is arranged corresponding to the valve strip. The locking pressure plate is provided with a recessed groove at one end facing the pressure plate compression spring, and the valve strip is provided with a hook that is buckled in the recessed groove. After the locking pressure plate is separated from the bimetallic plate and pressed toward the valve strip, a mutual locking mechanism is provided between the locking pressure plate and the valve strip.

[0017] The mutually locking mechanism is that the valve strip is wedge-shaped at its hinged end after it is opened, and the corresponding ends of the locking plate and the valve strip have conical cavities, and the valve strip with a wedge-shaped hinged end and the valve strip with a conical cavity form a wedge-shaped lock.

[0018] The back of the valve plate is provided with an inclined surface protrusion, which is arranged up and down approximately in the middle position of the left and right direction of the valve plate, and the end of the valve plate pressure strip is provided with an inclined surface corresponding to the inclined surface protrusion.

[0019] There are two air outlets, which are symmetrically arranged on the end face of the air outlet. A sealing ring is sleeved on the edge of the air outlet. The end face of the air outlet and the upper ends of the two valve plates are inclined toward the air inlet.

[0020] An air outlet is provided on the end surface, and the valve plate is a single piece, with one side of the valve plate hinged to the end surface.

[0021] The valve plate is hinged on the left or right end surface of the air outlet.

[0022] The valve plate is hinged on the end surface on the upper side or the lower side of the air outlet.

[0023] An air outlet is provided on the end surface, and the valve plate on the air outlet is divided into two parts, a smaller part of the valve plate is fixed on the air outlet, and the larger part of the valve plate is hinged to the smaller part of the valve plate.

[0024] The flue system of the present invention comprises a common flue, wherein a flue non-return fire damper installation opening is provided at a set position of the common flue; the aforementioned flue non-return fire damper is installed in the flue non-return fire damper installation opening.

[0025] After adopting the above structure, since the valve disc and the high-temperature closing device are respectively installed on the end face of the air end through the valve seat and the bracket, the valve seat and the bracket for installing the valve disc are set independently of each other, and there will be no mutual interference between the opening and closing of the valve disc and the high-temperature closing device, which is convenient for installation and adjustment, and the valve disc and the high-temperature closing device do not affect each other's stability; a spring corresponding to the valve disc is provided on the bracket to give the valve disc a certain initial closing elastic force, ensuring that the valve disc can be closed in time and easily. A guide cover is provided at the air outlet end of the smoke duct, which is consistent with the direction of the flue gas flow, so that the smoke exhaust direction is consistent with the flue gas flow direction, thereby not affecting the smooth flow of the public flue gas duct; fire damper locking parts are symmetrically provided on the back of the mounting plate in the left and right hood walls of the guide cover, which is convenient for installing and fixing the flue non-return fire damper on the public flue gas duct; the hook is pulled along the hook groove by the locking bolt to clamp the hook on the inner wall of the flue gas duct, and its structure is stable and easy to install, fix and replace. The end face is equipped with a high-temperature closing device with a locking mechanism that can force the valve disc to close toward the air inlet at a set temperature. When the smoke temperature in the public flue reaches a high emergency temperature, the high-temperature closing device forces the open valve disc to close, and the fire damper disc remains locked and closed, thus protecting the lives of residents. The two air outlets are symmetrically arranged on the end face of the air outlet end, and the end face of the air outlet end and the upper ends of the two valve discs are tilted toward the air inlet, ensuring that the two valve discs close naturally under their own weight. A sealing ring is installed on the edge of the air outlet to reduce the noise of the valve disc opening and closing and maintain a relative seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The specific embodiments of the present invention are described in further detail below with reference to the accompanying drawings:

[0027] Figure 1 It is a schematic diagram of the longitudinal section structure of the present invention;

[0028] Figure 2 for Figure 1 Schematic diagram of the structure from the right;

[0029] Figure 3 for Figure 2 AA cross-sectional structural diagram;

[0030] Figure 4 A schematic structural diagram of a fire damper locking member of the present invention;

[0031] Figure 5 for Figure 4 Schematic diagram of the structure from a bird's-eye view;

[0032] Figure 6 This is a structural diagram of the fire damper locking member in use;

[0033] Figure 7This is a schematic structural diagram of the high-temperature shutoff device of the present invention;

[0034] Figure 8 for Figure 7 BB cross-sectional structure diagram;

[0035] Figure 9 for Figure 8 Diagram of the state when the middle valve strip is opened;

[0036] Figure 10 for Figure 2 Another cross-sectional structural diagram of ;

[0037] Figure 11 for Figure 1 Another structural diagram of the right view;

[0038] Figure 12 for Figure 1 Another structural diagram of the right view;

[0039] Figure 13 for Figure 1 Another structural diagram from the right side;

[0040] Figure 14 A schematic longitudinal sectional view of another embodiment of the present invention;

[0041] Figure 15 This is a structural diagram of a flue system with a flue check fire damper. DETAILED DESCRIPTION

[0042] Reference Figure 1 — Figure 3As shown, the flue non-return fire damper includes a mounting plate 26 with a through hole, an air inlet channel 1 is provided on the front of the mounting plate 26, one end of the air inlet channel 1 has an air inlet 2, and the other end is an air outlet, and an air outlet end face 3 is provided on the back of the mounting plate 26. An air outlet end face 3 is provided on the air outlet end face 3, and there are two air outlets 5, which are symmetrically arranged on the left and right end faces of the air outlet end. A sealing ring 25 is provided on the edge of the air outlet 5, and a valve seat 23 is provided on the end face 3. A rotatable valve plate 4 that can only be opened in the air outlet direction is hinged on the valve seat 23. Of course, the valve seat 23 can also be provided on the back of the mounting plate 26. A high-temperature closing device with a locking mechanism is installed on the outer end surface of the outlet end face 3 via a bracket 6. This device can force the valve disc 4 to close toward the air inlet at a set temperature, ensuring that the valve disc 4 is always closed. The outlet end face and the upper ends of the two valve discs 4 are tilted toward the air inlet 2. The valve seat 23 and bracket 6 are located in the left and right middle positions of the outer end surface of the outlet end face 3. There are two valve seats 23 spaced apart from each other. The valve disc 4 is hinged to the valve seat 23 via a pin or hinge shaft, and the two valve seats 23 are located on the opposite inner sides of the upper and lower legs of the bracket 6. At this time, the two air outlets 5 are located on the left and right sides of the valve seat 23 and bracket 6. A sealing ring is installed on the edge of the air outlet to reduce the noise of the valve disc opening and closing and maintain a relative seal. The valve disc 4 is hinged on the valve seat 23, and the high-temperature closing device with a locking mechanism is arranged on the outer end surface of the air outlet end face 3 through the bracket 6. The valve seat 23 and the bracket 6 for installing the valve disc 4 are arranged independently of each other. There will be no mutual interference between the opening and closing of the valve disc 4 and the high-temperature closing device. It is easy to install and adjust, and the valve disc and the high-temperature closing device do not affect each other's stability. When the check valve 4 is about to close, the spring 27 gives the valve disc 4 a certain initial closing elastic force to ensure that the valve disc can be closed in time. The spring 27 can be fixed to the bracket 6 by screws or rivets. The two springs 27 can be installed on the upper leg of the bracket 6 or on the lower leg of the bracket 6. One of them can be installed on the upper leg of the bracket 6 and the other on the lower leg of the bracket 6. The two springs 27 have a certain rebound force and are located on the back side of the valve disc 4 relatively above. When the valve disc 4 is in the open state, the spring 27 is attached to the back side of the valve disc 4 and gives the valve disc 4 a closing rebound force. When the flue non-return fire damper stops working and the valve disc 4 is about to close, the spring 27 gives the valve disc 4 a certain initial closing elastic force to ensure that the valve disc can be closed in time. The spring 27 can be an elastic sheet. The mounting plate 26, the air inlet passage 1 and the air outlet end surface 3 are respectively processed and formed and then riveted or welded together.A deflector 20 aligns with the flue gas flow direction on the back of the mounting plate 26. Fire damper locking elements 21 are symmetrically positioned on the back of the mounting plate 26 within the left and right walls of the deflector 20 to facilitate the installation and securing of the flue check fire damper to the public flue. The deflector 20 aligns the smoke exhaust direction with the flue gas flow, thus ensuring smooth flow of the public flue gas. The deflector 20 has a roughly U-shaped cross-section, and hook slots 22 are located on the left and right walls of the deflector 20 to allow the fire damper locking elements 21 to extend.

[0043] Figure 4 — Figure 6 The fire damper locking member 21 shown includes a retaining sleeve 24 fixedly mounted on the back of a mounting plate 26, either by welding or riveting. The length of the retaining sleeve 24 is adapted to the wall thickness of the common flue gas duct. A bolt 10 is inserted into the retaining sleeve 24 from the front of the mounting plate 26. The mounting plate 26 has a bolt insertion hole corresponding to the inner hole of the retaining sleeve 24. A hook 16 is threadedly attached to the inner end of the bolt 10. The hook 16 is a plate-like member having a base 19 with a threaded hole 18 extending therethrough. The hook 16 and the threaded hole 18 are aligned in the same plane. A raised hook is provided at the end of the hook 16, facing the mounting plate. The hook 16 extends outward from a hook slot 22 and is pulled and clamped to the inner wall of the flue gas duct by the bolt 10. The hook groove 22 is angled, comprising a horizontally arranged straight groove section and a vertical groove section extending vertically upward along the inner end of the straight groove section, with a smooth transition between the straight and vertical groove sections. During installation, the bolt 10 is passed from the outside of the mounting plate 26 through the locking bolt insertion hole and the limit sleeve 24, and connected to the threaded hole 18 on the base 19. At this time, the base 19 is located on the relatively inner sides of the hook grooves 22 on the left and right sides of the deflector 20. The hooks 16 extend relatively outward and are in a horizontal position. The lower groove edge of the straight groove section is used to support the hooks 16 to maintain their horizontal position. That is, the two fire damper locking members 21 are symmetrically arranged on the fire damper, with the raised hooks at the ends of the hooks 16 facing the mounting plate 26. When the bolt 10 is tightened, the raised hooks at the ends of the hooks 16 press against the inner wall of the common flue gas duct, thereby achieving the overall installation and fixation of the flue gas check fire damper.

[0044] Figure 7 — Figure 9The high-temperature closing device shown includes a support shaft 7 mounted on a bracket 6, a threaded section being provided at one end of the support shaft 7, a slot being provided at one end of the support shaft 7 close to the valve disc 4, a valve disc pressure strip 14 being hinged in the slot through a hinge shaft 13, and two valve disc pressure strips 14 being symmetrically arranged along the support shaft 7, the two valve disc pressure strips 14 being respectively arranged corresponding to the two valve discs 4, a locking pressure plate 11 corresponding to the valve disc pressure strip 14 being mounted on the support shaft 7, a pressure plate compression spring 9 being mounted on the support shaft 7, a bimetallic strip 8 which can be separated at a set temperature and extends toward the locking pressure plate 11 being provided at the position of the bracket 6, the bimetallic strip 8 being formed by welding two metal sheets by welding material which can be melted at a set temperature, or by plugging together by a pin or card made of a hot-melt material which can be melted at a set temperature, and the bimetallic strip 8 can also be replaced by a hot-melt sheet which can be melted at a set temperature. The locking plate 11 is provided with a claw 16 that extends toward the bimetallic strip 8 and is clamped onto the bimetallic strip 8, and the bimetallic strip 8 is provided with a clamping hole corresponding to the claw 16, or the bimetallic strip 8 is provided with a claw that extends toward the beading locking plate 11 and is clamped onto the beading locking plate 11, and the beading locking plate 11 is provided with a clamping hole corresponding to the claw, so that a mutual locking relationship is formed between the beading locking plate 11 and the bimetallic strip 8. In this embodiment, the bracket 6 is provided with a support shaft mounting hole, and the bimetallic strip 8 is in the shape of a crank arm, one of which is provided with a mounting hole corresponding to the support shaft mounting hole on the bracket 6. The bimetallic strip 8 is sleeved on the support shaft 7, and the support shaft 7 is fixed to the bracket 6 by a nut. Of course, the bimetallic strip 8 can be directly mounted on the bracket 6. The locking plate 11 has a recessed groove 17 on one end facing the pressure plate compression spring 9, and a hook 15 is provided on the valve strip 14 that snaps into the recessed groove 17. After the locking plate 11 is released from the bimetallic strip 8 and pressed against the valve strip 14, a mutual locking mechanism is formed between the locking plate 11 and the valve strip 14. The mutual locking mechanism is that the valve strip 14 forms a wedge shape at its hinged end after opening, and the corresponding ends of the locking plate 11 and the valve strip 14 have a tapered cavity 12. The valve strip 14 with a wedge-shaped hinged end and the valve strip 14 with a tapered cavity 12 form a wedge-shaped lock. Figure 8 、 Figure 9The valve strip 14 is in the shape of a crank arm, and the locking pressure plate 11 is roughly cylindrical. The two valve strips 14 are symmetrically arranged on the outside of the locking pressure plate 11. When the two valve strips 14 are in the locked state, the hook 15 on the valve strip 14 (at this time located on the opposite inner side of the valve strip 14) is buckled in the sink groove 17 of the locking pressure plate 11, and one section of the crank arm of the two valve strips 14 is respectively arranged parallel to the axial direction of the support shaft 7; when the two valve strips 14 are opened, the relative outer sides of the two valve strips 14 form an angle at the hinge end, and the inner cone angle of the conical cavity 12 of the locking pressure plate 11 is consistent with the angle formed by the two valve strips 14, and a wedge lock is formed between the inner cone surface of the conical cavity 12 of the locking pressure plate 11 and the relative outer sides of the two valve strips 14. When the flue gas temperature in the common flue duct reaches the set warning temperature, the solder between the bimetallic strips 8 melts, one of the strips falls off from the other, and the locking pressure plate 11 breaks away from the restraint of the bimetallic strip 8. Under the action of the pressure plate compression spring 9, it slides along the support shaft 7. At this time, the hook 15 on the valve strip 14 disengages the groove 17 of the locking pressure plate 11, and the locking pressure plate 11 presses against the two valve strips 14 and makes the two valve strips 14 open outward and press on the two valve discs 4. Since a wedge-shaped lock is formed between the valve strip 14 and the locking pressure plate 11 with a tapered cavity 12, the valve disc 4 is always in a closed state.

[0045] Figure 10 The flue check fire damper shown in the figure is basically the same as the above structure, except that: a bevel protrusion 28 is provided on the back of the valve plate 4, and the bevel protrusion 28 is along the left and right directions of the valve plate 4 ( Figure 2 The left and right direction, that is, the width of the valve plate 4) is roughly in the middle position up and down ( Figure 2 The vertical direction in the middle (i.e., the height of the valve disc 4) is set, that is, a reinforcing rib with a triangular cross-section is provided on the back of the valve disc 4, and the inclined surface protrusion 28 faces the air outlet direction. The length of the inclined surface protrusion 28 is 1 / 4-1 / 3 of the height of the valve disc 4, and the inclined surface protrusion 28 is located approximately in the middle position of the height direction of the valve disc 4. The acute angle between the inclined surface of the inclined surface protrusion 28 and the plane where the back of the valve disc 4 is located is 15-20 degrees, and the end of the valve disc pressure strip 14 is provided with an inclined surface 29 corresponding to the inclined surface protrusion 28. When the flue gas temperature in the common flue gas duct reaches the set warning temperature, the solder between the bimetallic strips 8 melts, one of the strips falls off from the other, and the locking pressure plate 11 breaks away from the restraint of the bimetallic strip 8. Under the action of the pressure plate compression spring 9, it slides along the support shaft 7. At this time, the hook 15 on the valve strip 14 disengages the groove 17 of the locking pressure plate 11, and the locking pressure plate 11 presses against the two valve strips 14 and opens the two valve strips 14 outward to press on the two valve discs 4. Since a wedge-shaped lock is formed between the valve strip 14 and the locking pressure plate 11 with a tapered cavity 12, the valve disc 4 is always in a closed state. At the same time, the inclined surfaces 29 at the ends of the two valve strips 14 abut against the inclined surfaces of the inclined surface protrusions 28, further ensuring that the valve disc 4 is always in a closed state.

[0046] In the aforementioned embodiment, the flue check fire damper has an outlet end face adapted to the smoke passage, with two outlets provided on the end face, and a rotatable valve disc corresponding to the outlets that can only be opened in the outlet direction. The high temperature closing device for forcibly closing the valve disc is Figure 7 The double-leg structure shown in the figure is actually used because the structure of the flue check fire damper itself is diverse, such as: the valve disc is set in the smoke channel of the fire damper, the smoke channel can also be a variable diameter channel, the valve disc can be two discs or one disc, and the opening direction of the valve disc can be opposite, side, upper, lower, etc. In order to adapt to the forced closing of the valve disc of the flue check fire damper with different structures, the high-temperature closing device for forcibly closing the valve disc can also adopt a single-leg structure, that is, Figure 7 The left or right leg of the middle bracket 6 is removed, leaving only one leg, so that the high-temperature closing device can be installed on the corresponding part of the flue non-return fire damper, such as by installing it on the end face of the air outlet through the leg that is folded outward at the end of the leg, or on the mounting plate of the flue non-return fire damper, or on the side wall of the outer shell of the flue non-return fire damper. The high-temperature closing device for forcibly closing the valve plate can be a support shaft 7 provided on the bracket 6, on which a locking plate 11 is mounted, and on the support shaft 7 between the locking plate 11 and the bracket 6, a pressure plate compression spring 9 is mounted, and on the bracket 6, a bimetallic strip 8 is provided that extends toward the locking plate 11 and can melt or separate at a set temperature, and the locking plate 11 is provided with a claw 16 that extends toward the bimetallic strip 8 and is clamped on the bimetallic strip 8, and the bimetallic strip 8 is provided with a clamping hole corresponding to the claw 16. When the flue gas temperature in the public flue reaches When the set warning temperature is reached, the solder between the bimetallic strips melts, one of the strips falls off from the other, and the locking plate 11 breaks free from the restraint of the bimetallic strips. Under the action of the pressure plate compression spring 9, the locking plate 11 slides along the support shaft 7, pressing the valve plate 4, and the valve plate 4 is in a closed state. At this time, as long as the outer diameter of the locking plate 11 is adapted to the valve plate 4, it can adapt to both a single-valve-plate flue check fire damper and a double-valve-plate flue check fire damper. It can be a single-leg structure bracket or a double-leg structure bracket. A valve strip 14 corresponding to the locking plate 7 is hinged on one end of the support shaft 7 close to the valve plate 4, which is a further optimization of the above structure. The valve strip 14 can be two symmetrically arranged along the support shaft 7, corresponding to the fire damper that forces the two valve plates to be closed, or it can be one, corresponding to the fire damper that forces the single valve plate to be closed. A recessed groove 17 is provided at one end of the locking pressure plate 11 facing the pressure plate compression spring 9, and a hook 15 is provided on the valve plate pressure strip 14 which is snapped into the recessed groove 17. After the locking pressure plate 11 separates from the bimetallic strip 8 and presses against the valve plate pressure strip 14, the valve plate pressure strip 14 opens outward and presses on the valve plate 4. Since a wedge-shaped lock is formed between the valve plate pressure strip 14 and the locking pressure plate 11 with the conical cavity 12, the valve plate 4 is always in a closed state.

[0047] See also Figure 11 — Figure 13 An air outlet 5 is provided on the end surface 3, and a rotatable valve plate 4 is provided on the air outlet 5, which can only be opened in the air outlet direction. The end surface of the air outlet and the upper end of the valve plate 4 are inclined toward the air inlet 2. Figure 11 As shown, the left side of the valve disc 4 is hinged to the end face 3 via the valve seat 23. In this case, the high-temperature closing device adopts a single-leg structure, and its leg is also installed on the end face 3 on the left side of the air outlet 5. Of course, the right side of the valve disc 4 can also be hinged to the end face 3 via the valve seat 23. In this case, the leg of the high-temperature closing device is also installed on the end face 3 on the right side of the air outlet 5. Figure 12 As shown, the upper side of the valve disc 4 is hinged to the end surface 3 through the valve seat 23. In this case, the high-temperature closing device adopts a single-leg structure, and its leg is also installed on the end surface 3 on the upper side of the air outlet 5. Of course, the lower side of the valve disc 4 can also be hinged to the end surface 3 through the valve seat 23. In this case, the leg of the high-temperature closing device is also installed on the end surface 3 on the lower side of the air outlet 5. Figure 13 As shown, the valve disc on the air outlet 5 is divided into two parts, a smaller part, fixed to the upper part of the air outlet 5, and a larger part, hinged to the smaller part, via the valve seat 23. That is, the valve disc 4 is a top-opening type. In this case, the high-temperature shut-off device adopts a single-leg structure, and its leg is also mounted on the end surface 3 on the upper side of the air outlet 5. Of course, the valve disc 4 can also be a left-opening or right-opening type. In this case, the leg of the high-temperature shut-off device is also mounted on the end surface 3 on the left or right side of the air outlet 5. In addition to the aforementioned structure, the valve disc structure can also be a disc-shaped structure.

[0048] See also Figure 14This flue fire damper, a non-return device, comprises a cylindrical air inlet duct 1 formed by an outer shell. This air inlet duct can be a variable diameter duct and has opposing air inlet and outlet ports (i.e., opposing air inlet and outlet channels). A mounting plate 26 is provided on the outer wall of the outer shell. For ease of installation, the mounting plate 26 is typically square in shape. A flue locking member 21 is provided on the mounting plate 26 to secure it to the flue, facilitating the installation of the flue fire damper to the common flue duct. Inside the mounting plate 26, a flow deflector 20 is provided, aligned with the flue airflow direction. The flow deflector 20 has a roughly U-shaped cross-section, with hook slots on both sides for mounting the flue locking member 21. Locking bolt insertion holes are provided on the mounting plate 26, corresponding to the hook slots. A valve disc 4 is disposed within the air intake passage. The two valve discs 4 are arranged opposite each other, generally symmetrically along their longitudinal centerline. The valve discs 4 have two operating positions: closed and open. A blocking body is disposed at one end of the air intake passage near the air inlet 2, preventing the two valve discs from opening toward the air outlet. Valve disc pivot shafts 33 are located at each longitudinal end of the two valve discs 4. A corresponding valve seat 23 is disposed within the air intake passage. The valve seat 23 can be fixed to the inner wall of the oil fume passage or to the blocking body. A valve disc opening limiter is disposed on the valve seat 23, facing toward the air outlet. The limiter can be a protrusion perpendicular to the valve seat 23. The blocking body can be an annular body disposed on the inner wall of the air intake passage, or a boss disposed on the inner wall of the oil fume passage, or raised points spaced annularly along the inner wall of the air intake passage. A longitudinal connecting strip 30 is provided within the air inlet passage near the air inlet 2, dividing the air inlet 2 into two parts. The connecting strip 30 and the barrier can be integrally formed, with the longitudinal ends of the connecting strip 30 connected to the inner edge of the barrier. Alternatively, the connecting strip 30 and the barrier can be separately connected to the inner wall of the oil smoke passage, with the connecting strip 30 and the barrier in close contact. For ease of description, the side of the connecting strip 30 facing the air inlet 2 is considered the outer side, and the side facing the air outlet is considered the inner side. The valve disc pivot axis is located near the connecting strip 30 and is located inside the side of the connecting strip 30 facing the air outlet, so that the two valve discs 4 can only open toward the air outlet. The barrier is provided to prevent the two valve discs from opening toward the air outlet and to facilitate the sealing of the periphery of the valve discs. The proximity of the valve disc pivot axis to the connecting strip 30 facilitates the sealing of the periphery of the valve discs against the barrier, while also ensuring a compact structure and flexible opening and closing of the connecting components. The aforementioned valve disc 4 can also be provided on the air inlet 2.

[0049] Figure 15The figure shows a flue system with a flue check fire damper, comprising a common flue duct 31. A flue check fire damper mounting opening 32 is defined at a designated location within the common flue duct. The flue check fire damper mounting opening 32 is typically located on the wall of the common flue duct near a range hood. The flue check fire damper is mounted within the flue check fire damper mounting opening 32. The flue check fire damper's mounting plate 26 abuts against the wall of the common flue duct. The flue check fire damper's air outlet is located within the common flue duct, while its air inlet is located outside the common flue duct. The flue check fire damper can be secured within the flue check fire damper mounting opening 32 using the flue locking member described in the above embodiment, or it can be secured within the flue check fire damper mounting opening 32 using any known method.

[0050] The specific structures of the above embodiments are intended to illustrate the present invention rather than to limit the present invention. All improvements based on the present invention should fall within the scope of protection of the present invention.

Claims

1. A flue check fire damper comprising a mounting plate (26) with a through hole, characterized in that The front of the mounting plate (26) is provided with an air inlet channel (1), and the back of the mounting plate (26) is provided with an air outlet end surface (3), and the air outlet end surface (3) is provided with an air outlet (5). The air outlet end surface (3) or the mounting plate (26) is provided with a valve seat (23), and the valve seat (23) is hinged with a rotatable valve plate (4) that can only be opened in the air outlet direction; the air outlet end surface (3) or the mounting plate (26) is provided with a valve plate (4) that can be forced to close toward the air inlet side at a set temperature through a bracket (6). A high-temperature closing device with a locking mechanism to keep the valve plate (4) always in a closed state; the high-temperature closing device with a locking mechanism comprises a support shaft (7) mounted on a bracket (6), a locking pressure plate (11) is mounted on the support shaft (7), a pressure plate compression spring (9) is mounted on the support shaft (7), a hot melt plate or a separated bimetallic plate (8) that can melt at a set temperature and extends toward the locking pressure plate (11) is provided on the bracket (6), and the locking pressure plate (11) and the hot melt plate or bimetallic plate (8) are interlocked; The support shaft (7) is hingedly connected to a valve strip (14) at one end thereof close to the valve plate (4); a locking pressure plate (11) is correspondingly arranged to the valve strip (14); a sink groove (17) is provided at one end of the locking pressure plate (11) facing the pressure plate compression spring (9); a hook (15) is provided on the valve strip (14) and is snapped into the sink groove (17); after the locking pressure plate (11) is separated from the bimetallic plate (8) and pressed toward the valve strip (14), a mutual locking mechanism is provided between the locking pressure plate (11) and the valve strip (14); The interlocking mechanism is that the valve strip (14) is wedge-shaped at its hinged end after opening, the locking plate (11) and the corresponding ends of the valve strip (14) have a tapered cavity (12), and the valve strip (14) with a wedge-shaped hinged end and the valve strip (14) with the tapered cavity (12) form a wedge-shaped lock; The back of the valve plate (4) is provided with an inclined protrusion (28), and the inclined protrusion (28) is arranged up and down approximately in the middle position in the left-right direction of the valve plate (4), and the end of the valve plate pressure strip (14) is provided with an inclined surface (29) corresponding to the inclined protrusion (28); A deflector cover (20) is provided on the back of the mounting plate (26), and fire damper locking members (21) are symmetrically provided on the back of the mounting plate (26) within the left and right walls of the deflector cover (20). Hook grooves (22) for allowing the fire damper locking members (21) to extend are provided on the left and right walls of the deflector cover (20); The fire damper locking member (21) includes a limiting sleeve (24) fixedly mounted on the back of the mounting plate (26), a bolt (10) penetrating from the front of the mounting plate (26) is provided in the limiting sleeve (24), a hook (16) is screwed to the inner end of the bolt (10), the hook (16) extends relatively outward from the hook groove (22), and the hook (16) is pulled and clamped on the inner wall of the flue by the bolt (10).

2. The flue check fire damper according to claim 1 is characterized in that The valve seat (23) is arranged at the left and right middle positions of the outer end surface of the air outlet end surface (3) or the back of the mounting plate (26). There are two valve seats (23) arranged at intervals in the upper and lower parts. The valve plate (4) is hinged to the valve seat (23) via a pin shaft or a hinge shaft.

3. A flue check fire damper, comprising a mounting plate (26) with a through hole, characterized in that The front of the mounting plate (26) is provided with an air inlet channel (1), and the back of the mounting plate (26) is provided with an air outlet end surface (3), and the air outlet end surface (3) is provided with an air outlet (5). The air outlet end surface (3) or the mounting plate (26) is provided with a rotatable valve plate (4) that can only be opened in the air outlet direction; a high-temperature closing device with a locking mechanism that can force the valve plate (4) to close toward the air inlet side at a set temperature is provided on the air outlet end surface (3) or the mounting plate (26) through a bracket (6), so that the valve plate (4) is always in a closed state. The bracket (6) is provided with a spring (27) corresponding to the valve plate (4), and the spring (27) is located on the back side of the valve plate (4); the high-temperature closing device with a locking mechanism comprises a support shaft (7) mounted on the bracket (6), a locking pressure plate (11) is mounted on the support shaft (7), a pressure plate compression spring (9) is mounted on the support shaft (7), and a hot melt plate or a separated bimetallic plate (8) that can melt at a set temperature and extends toward the locking pressure plate (11) is provided on the bracket (6), and the locking pressure plate (11) and the hot melt plate or bimetallic plate (8) are interlocked; The support shaft (7) is hingedly connected to a valve strip (14) at one end thereof close to the valve plate (4); a locking pressure plate (11) is correspondingly arranged to the valve strip (14); a sink groove (17) is provided at one end of the locking pressure plate (11) facing the pressure plate compression spring (9); a hook (15) is provided on the valve strip (14) and is snapped into the sink groove (17); after the locking pressure plate (11) is separated from the bimetallic plate (8) and pressed toward the valve strip (14), a mutual locking mechanism is provided between the locking pressure plate (11) and the valve strip (14); The interlocking mechanism is that the valve strip (14) is wedge-shaped at its hinged end after opening, the locking plate (11) and the corresponding ends of the valve strip (14) have a tapered cavity (12), and the valve strip (14) with a wedge-shaped hinged end and the valve strip (14) with the tapered cavity (12) form a wedge-shaped lock; The back of the valve plate (4) is provided with an inclined protrusion (28), and the inclined protrusion (28) is arranged up and down approximately in the middle position in the left-right direction of the valve plate (4), and the end of the valve plate pressure strip (14) is provided with an inclined surface (29) corresponding to the inclined protrusion (28); A deflector cover (20) is provided on the back of the mounting plate (26), and fire damper locking members (21) are symmetrically provided on the back of the mounting plate (26) within the left and right walls of the deflector cover (20). Hook grooves (22) for allowing the fire damper locking members (21) to extend are provided on the left and right walls of the deflector cover (20); The fire damper locking member (21) includes a limiting sleeve (24) fixedly mounted on the back of the mounting plate (26), a bolt (10) penetrating from the front of the mounting plate (26) is provided in the limiting sleeve (24), a hook (16) is screwed to the inner end of the bolt (10), the hook (16) extends relatively outward from the hook groove (22), and the hook (16) is pulled and clamped on the inner wall of the flue by the bolt (10).

4. The flue check fire damper according to claim 3 is characterized in that The two springs (27) are symmetrically arranged on the left and right sides. The two springs (27) are fixed to the bracket (6) by screws or rivets. The two springs (27) have a rebound force that closes the valve plate (4).

5. The flue check fire damper according to claim 1 is characterized in that The hook groove (22) is in a corner shape, and has a horizontally arranged straight groove section and a vertical groove section arranged vertically upward along the inner end of the straight groove section. The straight groove section and the vertical groove section of the hook groove (22) are smoothly transitioned.

6. The flue check fire damper according to claim 5 is characterized in that The outer end of the hook member (16) is provided with a raised hook head, and the raised hook head faces the mounting plate (26).

7. The flue check fire damper according to claim 1 is characterized in that There are two air outlets (5) symmetrically arranged on the end face of the air outlet end. A sealing ring (25) is provided on the edge of the air outlet (5). The end face of the air outlet end and the upper ends of the two valve plates (4) are inclined toward the air inlet (2).

8. The flue check fire damper according to claim 1 or 3, characterized in that An air outlet (5) is provided on the end surface (3), and the valve plate (4) is a single piece, with one side of the valve plate (4) hinged to the end surface (3).

9. The flue check fire damper according to claim 1 is characterized in that The valve plate (4) is hinged on the end surface (3) on the left or right side of the air outlet (5).

10. The flue check fire damper according to claim 1, characterized in that The valve plate (4) is hinged on the end surface (3) on the upper side or the lower side of the air outlet (5).

11. The flue check fire damper according to claim 1 or 3, characterized in that An air outlet (5) is provided on the end surface (3), and a valve plate on the air outlet (5) is divided into two parts, a smaller part of the valve plate is fixed on the air outlet (5), and the larger part of the valve plate is hinged to the smaller part of the valve plate.

12. A flue system, characterized in that include: Public flue gas duct: The public flue gas duct is provided with a flue non-return fire damper installation port at its setting position; The flue non-return fire damper installation opening is installed with the flue non-return fire damper according to any one of claims 1 to 11.

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