A flue fire damper

Abstract

The present invention discloses a flue fire damper, comprising a smoke passage formed by a shell, wherein one end of the smoke passage has an air inlet, and the other end is an air outlet, wherein the air outlet is provided with an end face adapted to the smoke passage, wherein the end face is provided with an air outlet, wherein the end face is provided with a rotatable valve disc corresponding to the air outlet and capable of opening only in the air outlet direction, and wherein the end face is provided with a high-temperature closing device having a locking mechanism capable of forcibly closing the valve disc toward the air inlet at a set temperature, so that the valve disc is always in a closed state. The present invention has flexible opening and good fume exhaust effect. When the smoke temperature in the public smoke passage is in a very high emergency state and the smoke temperature in the public smoke passage reaches a set warning temperature, the high-temperature closing device forcibly closes the valve disc in the open state, so that the valve disc of the fire damper is always in a locked closed state, thereby protecting the lives of residents.

Description

Technical Field

[0001] The present invention relates to a flue fire damper used in a kitchen using a public flue. Background Art

[0002] In kitchens using a longitudinal public flue, a device such as a flue 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 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 is installed at the flue outlet, hinged to the flue via a valve shaft. A high-temperature shutoff device is installed on the outlet side to force the valve closed. When the range hood is not in use, the valve is in a closed position due to its own gravity, covering the outlet. When the range hood is in use, the valve is in an open position, away from the outlet. Because multiple users share a common vertical flue, if a fire breaks out in a household, a large amount of high-temperature, harmful gases will flow into the vertical common flue. If the valve disc in the flue fire damper is not closed promptly, this large amount of high-temperature, harmful gases will enter the home of the user using the range hood through the flue fire damper's smoke channel, threatening the lives of the residents. Existing flue fire dampers are equipped with a high-temperature closing device on the outer end face of the air outlet that can force the valve disc to close toward the air inlet at a set temperature. When the smoke temperature in the common flue reaches a high emergency temperature, the high-temperature closing device forces the open valve disc to close. However, the high-temperature closing device on existing flue fire dampers uses a spring to close the valve disc. When the high temperature in the common flue continues for a certain period of time, the spring fails due to the high temperature, and the valve disc loses its restraining force and opens again, causing high-temperature, harmful gases to flow into the user's home, threatening the lives of the residents.

[0003] The existing flue fire damper is generally provided with an elastic clip or elastic sheet on the shell of the outer shell facing the air outlet side, and the flue fire damper is clamped on the air inlet of the flue by the elastic clip or elastic sheet. This installation and fixing method causes the flue fire damper to not fit tightly against the wall of the flue and is easy to loosen, resulting in air permeability at the joint between the flue fire damper and the air inlet of the flue. Another installation method is to drill a hole in the wall of the flue and install the flue fire damper on the air inlet of the flue by screws. This installation and fixing method is easy to damage the tiles on the wall of the flue, causing the tiles to break or crack. The above methods all have the problem of inconvenience in installing and replacing the flue fire damper. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a flue fire damper with good oil fume exhaust effect, which can be forcibly closed when the flue gas temperature in the public flue is at a very high emergency state, and the valve plate of the fire damper is always in a closed state.

[0005] In order to solve the above technical problems, the present invention includes a smoke channel composed of an outer shell, one end of the smoke channel has an air inlet, and the other end is an air outlet, the air outlet end is provided with an end face adapted to the smoke channel, the air outlet is provided on the end face, and a rotatable valve corresponding to the air outlet is provided on the end face, which can only be opened in the air outlet direction. Its structural feature is that a high-temperature closing device with a locking mechanism is provided on the end face, 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.

[0006] The high-temperature closing device with a locking mechanism includes a bracket installed on the outer end surface of the end face, the bracket is provided with a support shaft, the support shaft is provided with a pressure strip lock plate, the support shaft is provided with a pressure plate compression spring, and the bracket is provided with a hot melt sheet or a separate bimetallic sheet extending toward the pressure strip lock plate and capable of melting at a set temperature, and the pressure strip lock plate is interlocked with the hot melt sheet or bimetallic sheet.

[0007] A valve strip corresponding to a strip locking plate is hinged on one end of the support shaft close to the valve plate, and a recess is provided on one end of the strip locking plate facing the pressure plate compression spring, and a hook is provided on the valve strip that is buckled in the recess. After the strip locking plate separates from the bimetallic sheet and presses toward the valve strip, a mutual locking mechanism is provided between the strip locking plate and the valve strip.

[0008] The mutual locking mechanism is that the valve strip is wedge-shaped at its hinged end after it is opened, and the corresponding ends of the strip locking plate and the valve strip have conical cavities, and the valve strip with a wedge-shaped hinged end and the strip locking plate with a conical cavity form a wedge-shaped lock.

[0009] Or the high-temperature closing device with a locking mechanism includes a bracket installed on the outer end surface of the end face, a support shaft is provided on the bracket, and a valve strip is hinged at one end of the support shaft close to the valve disc, and a strip lock pressure plate corresponding to the valve strip is mounted on the support shaft, and a pressure plate compression spring is mounted on the support shaft, and a hot melt plate or a separable bimetallic plate that can melt at a set temperature and extends to the strip lock pressure plate. The strip lock pressure plate and the bimetallic plate are interlocked, and an inwardly arranged valve strip guide groove is provided along the relative outer side of the strip lock pressure plate, and a card slot is provided on the inner side of the valve strip guide groove, and a hook that is snapped into the card slot is provided on the valve strip.

[0010] There are two air outlets, and the valve plates are arranged corresponding to the air outlets; the valve plate moldings are two branches symmetrically arranged along the support axis, and the bimetallic strip is formed by welding two metal plates through welding materials that can melt at a set temperature.

[0011] The air outlet end of the smoke channel is provided with a flow guide cover which is consistent with the direction of the smoke channel, and the shell is provided with a smoke channel locking piece which fixes it on the smoke channel.

[0012] The flue locking piece includes a mounting seat, one end of which is provided with an ear seat, a locking strip is hinged on the ear seat, and the free end of the locking strip has a hook bent toward one side of the locking strip; the end of the locking strip close to the ear seat is provided with a lug extending out of one side of the locking strip, the lug is hinged with a pull seat, and a locking bolt is provided on the pull seat.

[0013] The lug and the hook are located on the same side of the lock bar, and a protrusion is provided at approximately the middle portion of the other side of the lock bar.

[0014] The mounting seat is fixed on the left and right outer walls of the end face, the air deflector is provided with a hook groove for the hook head to extend out, the hook head is arranged relatively outward, and the outer shell is provided with a locking bolt penetration hole; or the mounting seat is fixed on the left and right outer walls of the air deflector, the hook head is arranged relatively outward, and the outer shell is provided with a locking bolt penetration hole; or a mounting plate is provided on the outer wall of the outer shell, the mounting seat is symmetrically installed on the mounting plate, the hook head is arranged relatively outward, and the mounting plate is provided with a locking bolt penetration hole.

[0015] There are two air outlets, which are symmetrically arranged on the end surface of the air outlet end. The end surface of the air outlet end and the upper ends of the two valve plates are inclined toward the air inlet.

[0016] With the above structure, a high-temperature closing device with a locking mechanism is provided on the end face, which can force the valve disc to close toward the air inlet at a set temperature. When the smoke temperature in the public smoke duct reaches a high emergency temperature and reaches the set warning temperature, the high-temperature closing device forces the open valve disc to close, and the valve disc of the fire damper is always locked and closed, thereby protecting the lives of residents. A flow deflector aligned with the flue direction is provided at the outlet end of the smoke duct, ensuring that the smoke exhaust direction is consistent with the flue direction, thereby not affecting the smooth flow of the public smoke duct. The two air outlets are symmetrically arranged on the end face of the outlet end, and the end face of the outlet end and the upper ends of the two valve discs are inclined toward the air inlet, ensuring that the two valve discs close naturally under their own weight. A flue locking piece is provided on the outer shell to fix it to the flue, which makes it easy to install and fix the flue fire damper on the public flue. The locking bar is pulled to swing by the locking bolt, so that the hook of the locking bar is clamped on the inner wall of the flue. The structure is stable and easy to install, fix and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The specific embodiments of the present invention are described in further detail below with reference to the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of the longitudinal section structure of the present invention;

[0019] Figure 2 for Figure 1 Schematic diagram of the structure from the right;

[0020] Figure 3 for Figure 1 Schematic diagram of the structure from the left;

[0021] Figure 4 for Figure 2 AA cross-sectional structural diagram;

[0022] Figure 5 This is a schematic structural diagram of an implementation state of the high-temperature shutdown device of the present invention;

[0023] Figure 6 for Figure 5 BB cross-sectional structure diagram;

[0024] Figure 7 for Figure 6 The state diagram of the middle valve strip when it is open;

[0025] Figure 8 A schematic structural diagram of another embodiment of the high-temperature shutdown device of the present invention;

[0026] Figure 9 for Figure 8 Schematic diagram of CC cross-section structure;

[0027] Figure 10 for Figure 8 Schematic diagram of the structure of the middle pressure bar locking plate;

[0028] Figure 11 It is a structural schematic diagram of a flue locking piece;

[0029] Figure 12 for Figure 11 Schematic diagram of the structure from the right;

[0030] Figure 13 is a schematic structural diagram of another flue locking member;

[0031] Figure 14 for Figure 13 Schematic diagram of the structure from the right;

[0032] Figure 15 This is a structural diagram of the flue locking piece mounting base;

[0033] Figure 16This is a schematic structural diagram of another flue locking piece. DETAILED DESCRIPTION

[0034] Referring to the accompanying drawings, the flue fire damper includes a cylindrical smoke passage formed by a housing 1, with an air inlet 2 at one end and an outlet at the other. The outlet is provided with an end face 3 adapted to the smoke passage, an outlet 5 disposed on the end face 3, and a rotatable valve disc 4 corresponding to the outlet 5, which can only be opened in the outlet direction. In this embodiment, a mounting plate is provided on the outer wall of the housing 1. The mounting plate is integrally formed with the smoke passage forming the air inlet 2, and the end face 3 is affixed to the mounting plate after being stamped. Two air outlets 5 are provided on the end face of the outlet end. These outlets 5 are surrounded by projections or grooves facing the outer end face (which faces the direction of airflow from the flue gas duct). Two rotatable valve discs 4, corresponding to the air outlets 5 and open only in the airflow direction, are located on the outer end face of the outlet end. The two air outlets 5 are symmetrically arranged on the outlet end face. The outlet end face and the upper ends of the two valve discs 4 are inclined toward the air inlet 2. The valve discs 4 are surrounded by curved edges or ridges corresponding to the projections or grooves. A high-temperature closing device with a locking mechanism is installed on the end face 3. This device forces the valve discs 4 to close toward the air inlet 2 at a set temperature, ensuring that the valve discs 4 remain closed. The housing 1 is also equipped with a flue locking member 21 that secures the valve discs to the flue, facilitating the installation of the flue fire damper to the common flue gas duct.

[0035] A specific structure of a high-temperature closing device with a locking mechanism is as follows: it includes a bracket 6 mounted on the outer end surface of the end face 3, and a support shaft 7 is provided on the bracket 6. A threaded section is provided at one end of the support shaft 7. A slot is opened at one end of the support shaft 7 close to the valve disc 4, and a valve disc pressure strip 14 is hinged in the slot through a hinge shaft 13. The valve disc pressure strip 14 is two branches symmetrically arranged along the support shaft 7. The two valve disc pressure strips 14 are respectively arranged corresponding to the two valve discs 4. A pressure strip lock pressure plate 11 corresponding to the valve disc pressure strip 14 is mounted on the support shaft 7, and a pressure plate compression spring 9 is mounted on the support shaft 7. A bimetallic strip 8 that can be separated at a set temperature and extends to the pressure strip lock pressure plate 11 is provided at the position of the bracket 6. The bimetallic strip 8 is welded by two metal sheets through a welding material that can melt at a set temperature, or is assembled together by a pin or card made of a hot-melt material that can melt at a set temperature. The bimetallic strip 8 can also be replaced by a hot-melt sheet that can melt at a set temperature. The bead lock pressure 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 bead lock pressure plate 11 and is clamped onto the bead lock pressure plate 11, and the bead lock pressure plate 11 is provided with a clamping hole corresponding to the claw, so that a mutual locking relationship is formed between the bead lock pressure 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 can be directly mounted on the bracket. The pressure plate locking plate 11 has a recessed groove 17 on one end facing the pressure plate compression spring 9, and the valve plate pressure strip 14 has a hook 15 that snaps into the recessed groove 17. After the pressure plate locking plate 11 is separated from the bimetallic strip 8 and pressed against the valve plate pressure strip 14, a mutual locking mechanism is formed between the pressure plate locking plate 11 and the valve plate pressure strip 14. The mutual locking mechanism is that after the valve plate pressure strip 14 is opened, its hinged end is wedge-shaped, and the corresponding ends of the pressure plate locking plate 11 and the valve plate pressure strip 14 have a tapered cavity 12. The valve plate pressure strip 14 with a wedge-shaped hinged end forms a wedge-shaped lock with the pressure plate locking plate 11 with the tapered cavity 12. Figure 6 、 Figure 7The valve strip 14 is in the shape of a crank arm, and the strip locking plate 11 is roughly cylindrical. The two valve strips 14 are symmetrically arranged on the outside of the strip locking 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 strip locking 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 strip locking 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 strip locking 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 pressure strip lock 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 pressure strip lock plate 11, and the pressure strip lock plate 11 presses against the two valve strips 14 and makes the two valve strips 14 open outward and press on the two valve strips 4. Since a wedge-shaped lock is formed between the valve strip 14 and the pressure strip lock plate 11 with a tapered cavity 12, the valve strip 4 is always in a closed state.

[0036] In the above embodiment, the flue 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 5 In actual application, due to the diversity of the structure of the flue fire damper itself, 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, the opening direction of the valve disc can be opposite, side, upward, downward, etc. In order to adapt to the forced closing of the valve disc of the flue fire damper with different structures, the high-temperature closing device for forced closing the valve disc can also adopt a single-leg structure, that is, Figure 5The 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 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 fire damper and on the side wall of the outer shell of the flue 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 pressure strip lock plate 11 is mounted, and a pressure plate compression spring 9 is mounted on the support shaft 7 between the pressure strip lock plate 11 and the bracket 6, and a bimetallic strip 8 is provided on the bracket 6 that extends toward the pressure strip lock plate 11 and can melt or separate at a set temperature, and the pressure strip lock 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 smoke in the public flue When the temperature reaches the set warning temperature, the solder between the bimetallic strips melts, one of the strips falls off from the other, and the pressure strip lock plate 11 breaks free from the constraints of the bimetallic strips. Under the action of the pressure plate compression spring 9, it slides along the support shaft 7. The pressure strip lock plate 11 presses on 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 pressure strip lock plate 11 is adapted to the valve plate 4, it can adapt to both flue fire dampers with single valve plates and flue fire dampers with double valve plates. It can be a single-leg structure bracket or a double-leg structure bracket. A valve strip pressure strip 14 corresponding to the pressure strip lock 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 pressure 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 on one end of the pressure strip locking 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 pressure strip locking 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 pressure strip locking plate 11 with the conical cavity 12, the valve plate 4 is always in a closed state.

[0037] Another specific structure of the high temperature closing device with a locking mechanism is: comprising a bracket 6 mounted on the outer end surface of the end surface 3, see Figure 8The bracket 6 has a two-leg structure. The left or right leg of the bracket 6 can also be removed, leaving only one leg. The bracket 6 is provided with a support shaft 7. A valve plate pressure strip 14 is hingedly connected to the end of the support shaft 7 near the valve disc 4. The valve plate pressure strips 14 are two symmetrically arranged along the support shaft 7. The two valve plate pressure strips 14 are respectively provided for the two valve discs 4. A pressure strip lock plate 11 corresponding to the valve plate pressure strips 14 is mounted on the support shaft 7. A pressure plate compression spring 9 is mounted on the support shaft 7. A bimetallic strip 8 that can be separated at a set temperature and extends toward the pressure strip lock plate 11 is provided on the bracket 6. The bimetallic strip 8 can also be replaced by a hot melt strip that can melt at a set temperature. The pressure strip locking plate 11 is provided with a claw 16 extending toward the bimetallic strip 8 and 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 extending toward the pressure strip locking plate 11 and clamped onto the pressure strip locking plate 11, and the pressure strip locking plate 11 is provided with a clamping hole corresponding to the claw, so that a mutual locking relationship is formed between the pressure strip locking plate 11 and the bimetallic strip 8. An inwardly arranged valve plate pressure strip guide groove 19 is provided along the relative outer side of the pressure strip locking plate 11, and a clamping groove 18 is provided on the inner side of the valve plate pressure strip guide groove 19, and a clamping hook 15 is provided on the valve plate pressure strip 14 that is clamped into the clamping groove 18. In this embodiment, the support shaft 7, the hinged structure of the valve plate pressure strip 14 on the support shaft 7, the structure of the bimetallic strip 8 and the installation structure of the bimetallic strip 8 are the same as those in the previous embodiment. See. Figure 9 、 Figure 10The pressure strip locking plate 11 is roughly in the shape of a strip plate as a whole. A hole that fits with the support shaft 7 is provided in the middle part of the strip plate-shaped pressure strip locking plate 11. Inwardly arranged valve sheet pressure strip guide grooves 19 are provided at both ends along the length direction of the strip plate-shaped pressure strip locking plate 11. A clamping groove 18 is provided at the opposite inner ends of the two valve sheet pressure strip guide grooves 19. A clamping claw 16 is provided on one side in the width direction of the strip plate-shaped pressure strip locking plate 11. The two ends of the pressure strip locking plate 11 in the length direction are bent to the same side along the intersection of the valve sheet pressure strip guide groove 19 and the clamping groove 18. When the two valve strips 14 are in a locked state, the hooks 15 provided on the valve strips 14 (at this time located on the opposite inner side of the valve strips 14) are snapped into the slots 18 of the strip locking plate 11, and the two valve strips 14 are respectively located in the guide grooves 19, and the slots 18 and the guide grooves 19 are separated by spacers; when the two valve strips 14 are opened, the two valve strips 14 are roughly in a symmetrical and parallel state, and the outer edge of the spacer between the slots 18 and the guide grooves 19 is snapped into the hooks 15, so that the two valve strips 14 are in a locked state. 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 pressure strip locking plate 11 breaks away from the restraint of the bimetallic strip 8 and slides along the support shaft 7 under the action of the pressure plate compression spring 9. At this time, the hook 15 on the valve strip 14 forms a groove with the inner side surface relative to the valve strip 14 during the expansion process of the valve strip 14, and the outer edge of the partition slides along the groove. The pressure strip locking plate 11 presses against the two valve strips 14 and opens the two valve strips 14 outward to press on the two valve strips 4. Since the valve strip 14 is in a locked state, the valve strip 4 is always in a closed state.

[0038] The valve disc 4 is hinged to the bracket 6, or alternatively, to the end face 3. There can be one air outlet 5, corresponding to a single valve disc 4. A deflector 20 is installed at the outlet end of the flue gas duct, aligned with the flue gas flow. The deflector 20 has a roughly U-shaped cross-section and aligns the flue gas flow direction, ensuring smooth flow of the common flue gas duct.

[0039] The flue locking piece 21 includes a mounting base 101, an ear seat 111 is provided at one end of the mounting base 101, the ear seat 111 and the mounting base 101 are an integral part, the mounting base 101 is a plate member, and one end of the mounting base 101 is bent to one side along its middle position to form two ear seats 111, the two ear seats 111 are arranged parallel and symmetrically, and the parallel distance between the two ear seats 111 should be able to accommodate the installation of the lock strip, a notch 112 is provided on the plate body of the mounting base 101 between the front ends of the two ear seats 111, pin holes are symmetrically provided between the two ear seats 111, and a mounting hole 109 is provided on the mounting base 101. The ear seat 111 is hinged with a lock bar 102 by a pin 106, and the free end of the lock bar 102 has a hook 108 bent toward one side of the lock bar 102. The lock bar 102 is a plate part, and the end of the lock bar 102 close to the ear seat 111 is provided with a lug 113 extending out of one side of the lock bar 102. The lug 113 and the hook 108 are located on the same side of the lock bar 102, and the lug 113 is hinged with a pull seat 103 by a pin 106. The pull seat 103 is provided with a locking bolt 105. The pull seat 103 is also a plate part, and a bent section 104 is provided at the free end of the pull seat 103. The bent section 104 is roughly perpendicular to the pull seat 103 body, and a threaded hole is provided in the approximate middle part of the bent section 104. The locking bolt 105 is provided on the bent section 104, and an outwardly arranged protrusion 107 is provided in the approximate middle part of the other side of the lock bar 102. The two ear seats 111 and the mounting seat 101 are integrally bent and formed, and have both a guiding function and a covering function for the locking bar 102 , and the structure is stable.

[0040] See also Figure 11 、 Figure 12 and Figure 15The flue locking device shown in FIG. 1 has a mounting base 101 and an ear base 111 hinged to the mounting base 101 extending in the same direction, with their hinged ends located at one end. A pull base 103 and a locking bolt 105 provided on the pull base 103 extend in the other direction along the mounting base 101 and the hinged end of the mounting base 101, with the two ear bases 111 facing the lug 113. The mounting base 101 of the flue locking device can be symmetrically fixedly mounted on the left and right outer walls of the end surface 3. In this case, the air deflector 20 is provided with hook grooves 211 for the hooks 108 to extend, with the two hooks 108 arranged outwardly relative to each other. The mounting base 101 of the flue locking device can also be symmetrically fixedly mounted on the left and right outer walls of the air deflector 20, with the two hooks 108 arranged outwardly relative to each other. The mounting plate is provided with a locking bolt insertion hole. The locking bolt 105 penetrates the mounting plate surface at the air inlet end of the flue fire damper and connects to the pull seat 103. By tightening the locking bolt 105, the two hooks 108 open outward relative to each other and clamp onto the inner wall of the flue gas duct, thus completing the installation and fixation of the flue fire damper. The protrusion 107 provided on one side of the locking bar 102 initially abuts against the wall of the mounting seat 101, giving the locking bar 102 an opening angle relative to the mounting seat 101, facilitating the hooks 108 to open outward relative to each other and clamp onto the inner wall of the flue gas duct.

[0041] Figure 13 、 Figure 14 and Figure 15 Another flue lock shown in FIG. 1 has a mounting base 101 and an ear base 111 hingedly connected in sequence. The mounting base 101 and the pull base 103 extend in the same direction, with the two ear bases 111 facing the lug 113. The mounting base 101 of this flue lock can be symmetrically fixed on the left and right outer walls of the end face 3. In this case, the air deflector 20 is provided with hook slots 211 for the hooks 108 to extend outward, with the two hooks 108 facing outward. The mounting base 101 of the flue lock can also be symmetrically fixed on the left and right outer walls of the air deflector 20, with the two hooks 108 facing outward. A locking bolt insertion hole is provided on the mounting plate. The locking bolt 105 penetrates from the mounting plate surface at the air inlet end of the flue fire damper and connects to the pull base 103. By tightening the locking bolt 105, the two hooks 108 open outward relative to each other and clamp onto the inner wall of the flue duct, thus completing the installation and fixation of the flue fire damper. The protrusion 107 arranged on one side of the locking bar 102 has its initial position against the left and right outer walls of the end face 3 or against the left and right outer walls of the air deflector 20, so that the locking bar 102 has an opening angle relative to the left and right outer walls of the end face 3 or the left and right outer walls of the air deflector 20, which makes it easier for the hook head 108 to open relatively outward and clamped on the inner wall of the flue gas duct.

[0042] Figure 16 The structure of the flue locking piece shown is similar to Figure 13—15 is basically the same as the flue locking piece shown, except that the tail end of the mounting seat 101 is bent outward to form a crooked foot. The flue locking piece mounting seat 101 of this structure is symmetrically mounted on the mounting plate, the hook head 108 is relatively arranged outward, and the mounting plate is provided with a locking bolt insertion hole.

[0043] 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 fire damper, comprising a smoke passage formed by a housing (1), wherein one end of the smoke passage has an air inlet (2), and the other end is an air outlet, wherein the air outlet is provided with an end face (3) adapted to the smoke passage, the end face (3) is provided with an air outlet (5), and the end face (3) is provided with a rotatable valve plate (4) corresponding to the air outlet (5) and capable of opening only in the air outlet direction, wherein the valve plate is characterized by: The end surface (3) is provided with a high-temperature closing device having a locking mechanism capable of forcibly closing the valve plate (4) toward the air inlet (2) at a set temperature, so that the valve plate (4) is always in a closed state; The high-temperature closing device with a locking mechanism includes a bracket (6) mounted on the outer end surface of the end surface (3), a support shaft (7) is provided on the bracket (6), a pressure strip lock plate (11) is mounted on the support shaft (7), a pressure plate compression spring (9) is mounted on the support shaft (7) between the pressure strip lock plate (11) and the bracket (6), a hot melt sheet or a separated bimetallic sheet (8) extending toward the pressure strip lock plate (11) and capable of melting at a set temperature is provided on the bracket (6), and the pressure strip lock plate (11) and the hot melt sheet or bimetallic sheet (8) are interlocked; A valve strip pressure strip (14) corresponding to the pressure strip locking plate (11) is hinged on one end of the support shaft (7) close to the valve plate (4); a recess (17) is provided on one end of the pressure strip locking plate (11) facing the pressure plate compression spring (9); a hook (15) is provided on the valve strip pressure strip (14) and is snapped into the recess (17); after the pressure strip locking plate (11) is separated from the bimetallic plate (8) and pressed toward the valve strip pressure strip (14), a mutual locking mechanism is provided between the pressure strip locking plate (11) and the valve strip pressure strip (14); The interlocking mechanism is that the valve plate pressure strip (14) is wedge-shaped at its hinged end after opening, the pressure strip locking plate (11) and the corresponding ends of the valve plate pressure strip (14) have a tapered cavity (12), and the valve plate pressure strip (14) with a wedge-shaped hinged end and the pressure strip locking plate (11) with the tapered cavity (12) form a wedge-shaped locking.

2. A flue fire damper, comprising a smoke passage formed by a housing (1), wherein one end of the smoke passage has an air inlet (2), and the other end is an air outlet, wherein the air outlet is provided with an end face (3) adapted to the smoke passage, the end face (3) is provided with an air outlet (5), and the end face (3) is provided with a rotatable valve plate (4) corresponding to the air outlet (5) and capable of opening only in the air outlet direction, wherein the valve plate is characterized by: The end surface (3) is provided with a high-temperature closing device having a locking mechanism that can force the valve plate (4) to close toward the air inlet (2) at a set temperature, so that the valve plate (4) is always in a closed state. The high-temperature closing device with a locking mechanism includes a bracket (6) mounted on the outer end surface of the end surface (3), a support shaft (7) is provided on the bracket (6), and a valve plate pressure strip (14) is hingedly connected to one end of the support shaft (7) close to the valve plate (4), and a pressure strip locking plate (11) corresponding to the valve plate pressure strip (14) is mounted on the support shaft (7), and a pressure plate compression spring (9) is mounted on the support shaft (7). A hot melt sheet or a separated bimetallic sheet (8) that can melt at a set temperature and extends toward the pressure strip locking plate (11) is provided at the bracket (6), and the pressure strip locking plate (11) and the bimetallic sheet (8) are interlocked, and a valve plate pressure spring (14) arranged inward is provided along the relative outer side of the pressure strip locking plate (11). The valve strip guide groove (19) is provided with a card slot (18) on the inner side of the valve strip guide groove (19), and the valve strip (14) is provided with a card hook (15) that is buckled in the card slot (18); the outlet end of the smoke channel is provided with a flow guide cover (20) that is consistent with the direction of the smoke duct, and the shell (1) is provided with a smoke duct locking member (21) that fixes it to the smoke duct; the smoke duct locking member (21) includes a mounting seat (101), the mounting seat (10 1) is provided with an ear seat (111) at one end, a locking bar (102) is hinged on the ear seat (111), and the free end of the locking bar (102) has a hook head (108) bent toward one side of the locking bar (102); the end of the locking bar (102) close to the ear seat (111) is provided with a lug (113) extending out of one side of the locking bar (102), a pull seat (103) is hinged on the lug (113), and a locking bolt (105) is provided on the pull seat (103).

3. The flue fire damper according to claim 1 or 2, characterized in that There are two air outlets (5), and the valve plate (4) is arranged corresponding to the air outlet (5); the valve plate pressure strip (14) is two symmetrically arranged along the support axis (7), and the bimetallic strip (8) is formed by welding two metal sheets through a welding material that can melt at a set temperature.

4. The flue fire damper according to claim 2, characterized in that The lug (113) and the hook (108) are located on the same side of the locking bar (102), and a protrusion (107) is provided at approximately the middle portion of the other side of the locking bar (102).

5. The flue fire damper according to claim 2, characterized in that The mounting seat (101) is fixed on the left and right outer side walls of the end surface (3), the deflector (20) is provided with a hook groove (211) for the hook (108) to extend outward, the hook (108) is relatively arranged outward, and the housing (1) is provided with a locking bolt insertion hole.

6. The flue fire damper according to claim 2, characterized in that The mounting seat (101) is fixed on the left and right outer side walls of the air deflector (20), the hook head (108) is arranged relatively outward, and the housing (1) is provided with a locking bolt penetration hole.

7. The flue fire damper according to claim 2, characterized in that The outer wall of the housing (1) is provided with a mounting plate, the mounting seat (101) is symmetrically mounted on the mounting plate, the hooks (108) are relatively arranged outward, and a locking bolt penetration hole is provided on the mounting plate.

8. The flue fire damper according to claim 1 or 2, characterized in that There are two air outlets (5) which are symmetrically arranged on the end surface of the air outlet end. The end surface of the air outlet end and the upper ends of the two valve plates (4) are inclined toward the air inlet (2).

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