Flue fire damper

Abstract

The present invention discloses a flue fire damper, which comprises a flue gas passage formed by a housing. One end of the flue gas passage has an air inlet, and the opposite end is an air outlet end. A rotatable valve plate that can only open in the air outlet direction is provided in the flue gas passage. A flue locking member capable of fixing it on the flue is provided on the housing, and a high-temperature closing device with a locking mechanism is also provided on the housing, which can force the valve plate to close towards the air inlet side at a set temperature. The flue locking member includes a mounting seat. One end of the mounting seat is provided with an ear seat, and a locking bar is hinged on the ear seat. The free end of the locking bar has a hook head bent towards one side of the locking bar. A lug protruding from one side of the locking bar is provided at one end of the locking bar close to the ear seat, and a pulling seat is hinged on the lug, and a locking bolt is provided on the pulling seat. The present invention facilitates the installation and fixation of the flue fire damper on the common flue gas duct. By pulling the locking bar to swing through the locking bolt, the hook head of the locking bar is clamped on the inner wall of the flue gas duct. Its structure is stable, facilitating installation, fixation and replacement.

Description

Technical Field

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

[0002] In a kitchen using a vertical common flue, in order to prevent the fumes in the flue from flowing back into the kitchen, a device such as a flue fire damper is generally provided between the outlet pipe of the range hood and the common flue. The existing flue fire damper generally includes a flue gas passage formed by a housing. The flue gas passage has opposite air inlets and air outlets. The air inlet is connected to the outlet pipe of the range hood, and the air outlet extends into the common flue. A closable valve plate is provided at the air outlet of the flue gas passage. The valve plate is one or two pieces hinged to the flue gas passage through a valve plate rotating shaft. A high-temperature closing device capable of forcibly closing the valve plate is provided on the air outlet side. When the range hood is not in use, the valve plate is in the closed position due to its own gravity, covering the air outlet part; when the range hood is in use, the valve plate is in the open position, and the valve plate is away from the air outlet. The existing flue fire dampers are generally installed on the air inlet of the flue by clamping the flue fire damper on the air inlet of the flue through an elastic clip or elastic piece provided on the housing on the side facing the air outlet. This installation and fixing method results in a poor fit between the flue fire damper and the flue wall surface, being prone to looseness, leading to air leakage at the joint between the flue fire damper and the air inlet of the flue; another installation method is to drill holes in the flue wall surface and install the flue fire damper on the air inlet of the flue through screws. This installation and fixing method is likely to damage the tiles on the flue wall surface, causing the tiles to crack or have cracks; the above methods all have the problem that the installation and replacement of the flue fire damper are inconvenient.

[0003] At the same time, since multiple users share a vertical common flue, once a fire occurs in one household, a large amount of high-temperature harmful gases will pour into the vertical common flue. At this time, if the valve plate in the flue fire damper is not closed in time, these large amounts of high-temperature harmful gases will enter the homes of users who are using the range hood through the flue gas passage of the flue fire damper, thus threatening the lives of the residents. The existing flue fire dampers are provided with a high-temperature closing device on the outer end surface of the air outlet end that can forcibly close the valve plate towards the air inlet side at a set temperature. When the flue gas temperature in the common flue is in a very high emergency state and the flue gas temperature in the common flue reaches the set warning temperature, the high-temperature closing device forcibly closes the valve plate in the open state. However, the high-temperature closing devices on the existing flue fire dampers all use the force of a spring to close the valve plate. When the high temperature in the common flue lasts for a certain period of time, the spring fails due to the high temperature, and the valve plate loses the restraint force of the spring and will be opened again, and the high-temperature harmful gases will pour into the user's home, thus threatening the lives of the residents. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a duct fire damper that is easy to install and fix on a common flue gas duct. At the same time, the duct fire damper can be forcibly closed in an emergency state where the flue gas temperature in the common flue gas duct is very high, and the valve plate of the fire damper is always in a closed state.

[0005] To solve the above technical problem, the present invention includes a flue gas passage composed of a housing. One end of the flue gas passage has an air inlet, and the opposite end is an air outlet end. A rotatable valve plate that can only open in the air outlet direction is provided in the flue gas passage or on the end face of the air outlet end. The structural feature is that a flue lock is provided on the housing to fix it on the flue.

[0006] The air outlet end is provided with an end face adapted to the flue gas passage. An air outlet is provided on the end face, and the flue lock is arranged on the end face.

[0007] The flue lock includes a mounting seat. An ear seat is provided at one end of the mounting seat. A locking bar is hinged on the ear seat. The free end of the locking bar has a hook bent towards one side of the locking bar. A lug protruding from one side of the locking bar is provided at the end of the locking bar close to the ear seat. A pulling seat is hinged on the lug, and a locking bolt is provided on the pulling seat.

[0008] The lug and the hook are located on the same side of the locking bar, and a protrusion is provided at approximately the middle position on the other side of the locking bar.

[0009] A flow guide cover in the same direction as the flue is provided at the air outlet end of the flue gas passage. The mounting seat is fixed on the left and right outer side walls of the end face. A hook slot for the hook to protrude is provided on the flow guide cover. The hook is arranged relatively outward, and a hole for the locking bolt to penetrate is provided on the housing.

[0010] A flow guide cover in the same direction as the flue is provided at the air outlet end of the flue gas passage. The mounting seat is fixed on the left and right outer side walls of the flow guide cover. The hook is arranged relatively outward, and a hole for the locking bolt to penetrate is provided on the housing.

[0011] A mounting disc is provided on the outer wall of the housing. The mounting seats are symmetrically mounted on the mounting disc. The hook is arranged relatively outward, and a hole for the locking bolt to penetrate is provided on the mounting disc.

[0012] A high-temperature closing device with a locking mechanism is provided on the end face to forcibly close the valve plate towards the air inlet side at a set temperature, so that the valve plate is always in a closed state.

[0013] The high-temperature shut-off device with a locking mechanism includes a bracket installed on the outer end face of the end face. A support shaft is provided on the bracket, and a locking pressure plate is sleeved on the support shaft. A pressure plate spring is sleeved on the support shaft. A heat-melting sheet or a separated bimetallic sheet that can melt at a set temperature and extends towards the locking pressure plate is provided at the bracket part. The bar locking pressure plate and the heat-melting sheet or the bimetallic sheet are interlocked with each other.

[0014] One end of the support shaft close to the valve plate is hinged with a valve plate bar. The locking pressure plate is arranged corresponding to the valve plate bar. A sunken groove is provided at one end of the locking pressure plate facing the pressure plate spring. A hook that is buckled in the sunken groove is provided on the valve plate bar. After the locking pressure plate disengages from the bimetallic sheet and presses towards the valve plate bar, a mutually locking mechanism is formed between the locking pressure plate and the valve plate bar.

[0015] The mutually locking mechanism is that the valve plate bar is wedge-shaped at its hinged end after being opened. The corresponding end of the locking pressure plate and the valve plate bar has a conical cavity. The valve plate bar with a wedge-shaped hinged end and the valve plate bar with a conical cavity form a wedge-shaped lock.

[0016] The high-temperature shut-off device with a locking mechanism includes a bracket installed on the outer end face of the end face. A support shaft is provided on the bracket. One end of the support shaft close to the valve plate is hinged with a valve plate bar. A locking pressure plate corresponding to the valve plate bar is sleeved on the support shaft. A pressure plate spring is sleeved on the support shaft. A heat-melting sheet or a separated bimetallic sheet that can melt at a set temperature and extends towards the locking pressure plate is provided at the bracket part. The bar locking pressure plate and the bimetallic sheet are interlocked with each other. An inwardly arranged valve plate bar guiding groove is provided along the relatively outer side of the locking pressure plate. A clamping groove is provided inside the valve plate bar guiding groove. A hook that is buckled in the clamping groove is provided on the valve plate bar.

[0017] There are two air outlets, which are symmetrically arranged left and right on the end face of the air outlet end. The end face of the air outlet end and the upper ends of the two valve plates are inclined towards the air inlet direction.

[0018] After adopting the above structure, since there is a flue locking piece on the outer shell for fixing it on the flue, it is convenient to install and fix the flue fire damper on the common flue; by pulling the lock bar to swing with the locking bolt, the hook of the lock bar is clamped on the inner wall of the flue, and its structure is stable, which is convenient for installation, fixing and replacement. And a high-temperature closing device with a locking mechanism is provided on the end face, which can force the valve plate to close towards the air inlet side at a set temperature. When the flue gas temperature in the common flue is in a very high emergency state and reaches the set warning temperature, the high-temperature closing device forcibly closes the valve plate in the open state, and the valve plate of the fire damper is always in the locked closed state, thus protecting the lives of the residents. A guide hood with the same direction as the flue is provided at the air outlet end of the flue gas passage, so that the flue gas discharge direction is the same as the flue direction, thus not affecting the smoothness of the common flue. And the two air outlets are symmetrically arranged left and right 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 plates are inclined towards the air inlet direction, which can ensure that the two valve plates naturally close by their own gravity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following is a more detailed description of the specific embodiments of the present invention in conjunction with the drawings:

[0020] Figure 1 It is a schematic longitudinal sectional structure diagram of the present invention;

[0021] Figure 2 is Figure 1 a schematic right view structure diagram;

[0022] Figure 3 is Figure 2 the A-A sectional structure diagram of;

[0023] Figure 4 It is a schematic longitudinal sectional structure diagram of another embodiment of the present invention;

[0024] Figure 5 It is a schematic structure diagram of an implementation state of the high-temperature closing device of the present invention;

[0025] Figure 6 is Figure 5 the B-B sectional structure diagram of;

[0026] Figure 7 is Figure 6 the state diagram when the valve plate pressing strip in is opened;

[0027] Figure 8 It is a schematic structure diagram of another implementation state of the high-temperature closing device of the present invention;

[0028] Figure 9 is Figure 8 the C-C sectional structure diagram of;

[0029] Figure 10 is Figure 8 a schematic structural view of the middle locking pressure plate;

[0030] Figure 11 is a schematic structural view of a flue locking member;

[0031] Figure 12 is Figure 11 a schematic structural view seen from the right;

[0032] Figure 13 is a schematic structural view of another flue locking member;

[0033] Figure 14 is Figure 13 a schematic structural view seen from the right;

[0034] Figure 15 is a schematic structural view of the mounting seat of the flue locking member;

[0035] Figure 16 is a schematic structural view of yet another flue locking member. Specific embodiments

[0036] Referring to the accompanying drawings, the flue fire damper includes a flue gas passage formed by a housing 1. The flue gas passage is cylindrical. One end of the flue gas passage has an air inlet 2, and the opposite end is the air outlet end. An end face 3 adapted to the flue gas passage is provided at the air outlet end. An air outlet 5 is provided on the end face 3. A rotatable valve plate 4 corresponding to the air outlet 5 and only opening in the air outlet direction is provided on the end face 3. In this embodiment, referring to Figure 1 — Figure 3 , a mounting plate is provided on the outer wall of the housing 1. The mounting plate is integrally formed with the flue gas passage constituting the air inlet 2. The end face 3 is fixedly connected to the mounting plate after being formed by stamping. Two air outlets 5 are provided on the end face at the air outlet end. A boss or groove facing the outer end face (the outer end face faces the air outlet direction of the flue gas passage) is provided around the air outlet 5. Two rotatable valve plates 4 corresponding to the air outlets 5 and only opening in the air outlet direction are provided on the outer end face at the air outlet end. The two air outlets 5 are symmetrically arranged left and right on the end face at the air outlet end. The end face at the air outlet end and the upper ends of the two valve plates 4 are inclined towards the air inlet 2. The periphery of the valve plate 4 is provided with a bent edge or a rib corresponding to the aforementioned boss or groove. A flue locking member 21 for fixing it to the flue is provided on the housing 1, so as to facilitate the installation and fixation of the flue fire damper on the common flue gas duct. A high-temperature closing device with a locking mechanism is provided on the end face 3 to force the valve plate 4 to close towards the air inlet 2 side at a set temperature, so that the valve plate 4 is always in the closed state. A deflector 20 with the same direction as the flue is provided at the air outlet end of the flue gas passage. The cross section of the deflector 20 is generally U-shaped. The deflector 20 is provided to make the flue gas discharge direction consistent with the flue direction, so as not to affect the smoothness of the common flue gas duct.

[0037] See Figure 4 , which is a flue fire damper of another structure. The flue fire damper includes a cylindrical flue gas passage formed by a housing 1. The flue gas passage can be a variable-diameter passage. The flue gas passage has opposite air inlets 2 and air outlets (i.e., opposite air inlet passages and air outlet passages). An installation plate 26 is provided on the outer wall of the housing 1. For the convenience of installation and fixation, the installation plate 26 is generally square. A flue locking member 21 for fixing it to the flue is provided on the installation plate 26 to facilitate the installation and fixation of the flue fire damper on the common flue gas duct. A valve plate 4 is provided in the flue gas passage. The valve plate 4 is composed of two relatively arranged pieces. The two valve plates 4 are generally symmetrically arranged along their longitudinal center lines. The valve plate 4 has two working positions: closed and open. A blocking body is provided at one end of the flue gas passage near the air inlet 2 to enable the two valve plates to only open towards the air outlet direction. Valve plate shafts 23 are respectively provided at the longitudinal two ends of the two valve plates 4, and corresponding shaft seats 24 are provided in the flue gas passage. The shaft seats 24 can be fixed on the inner wall of the oil fume passage or on the blocking body. A valve plate opening limiting device is provided on the shaft seat 24 towards the air outlet direction. This limiting device can be a protrusion perpendicular to the shaft seat 24. The blocking body can be an annular body provided on the inner wall of the flue gas passage. The blocking body can also be a boss provided on the inner wall of the oil fume passage or convex points arranged at intervals along the inner wall of the flue gas passage in a ring shape. A longitudinally arranged connecting strip 22 that divides the air inlet 2 into two parts is provided on the side of the flue gas passage near the air inlet 2. The connecting strip 22 and the blocking body can be integrally arranged, that is, the two longitudinal ends of the connecting strip 22 are respectively connected to the inner edge of the blocking body. It can also be that the connecting strip 22 and the blocking body are respectively connected to the inner wall of the oil fume passage, and the connecting strip 22 and the blocking body are closely attached together. For the convenience of description, the side of the connecting strip 22 facing the air inlet 2 is regarded as the outer side, and the side facing the air outlet is the inner side. The valve plate shaft is close to the connecting strip 22, and the valve plate shaft is located inside the side of the connecting strip 22 facing the air outlet side, so that the two valve plates 4 can only open towards the air outlet direction. The purpose of setting the blocking body is one to enable the two valve plates to only open towards the air outlet direction, and the other is to make the periphery of the valve plate easy to fit and relatively maintain sealing. And the valve plate shaft is close to the connecting strip 22, which is both to make the periphery of the valve plate easy to fit on the blocking body and relatively maintain sealing, and at the same time make the structure of each connecting component compact and the opening and closing flexible.

[0038] The flue locking member 21 includes a mounting base 101. One end of the mounting base 101 is provided with ear seats 111. The ear seats 111 and the mounting base 101 are an integral part. The mounting base 101 is a plate member. At one end of the mounting base 101, two ear seats 111 are formed by bending towards one side along the middle position. The two ear seats 111 are arranged in parallel and symmetrically. The parallel distance between the two ear seats 111 should be able to accommodate the installation of a locking bar. 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 shaft holes are symmetrically provided between the two ear seats 111. Mounting holes 109 are provided on the mounting base 101. A locking bar 102 is hinged to the ear seats 111 through a pin shaft 106. The free end of the locking bar 102 has a hook head 108 bent towards one side of the locking bar 102. The locking bar 102 is a plate member. One end of the locking bar 102 close to the ear seats 111 is provided with a lug 113 protruding from one side of the locking bar 102. The lug 113 and the hook head 108 are on the same side of the locking bar 102. A pull seat 103 is hinged to the lug 113 through a pin shaft 106. A locking bolt 105 is provided on the pull seat 103. The pull seat 103 is also a plate member. A bent section 104 is provided at the free end of the pull seat 103. The bent section 104 is substantially perpendicular to the main body of the pull seat 103. A threaded hole is provided at approximately the middle part of the bent section 104. The locking bolt 105 is provided on the bent section 104. A protrusion 107 is provided on the other side of the locking bar 102 at approximately the middle part and extends outward. The two ear seats 111 and the mounting base 101 are integrally bent and formed, which has both a guiding function and a covering effect on the locking bar 102, and the structure is stable.

[0039] See Figure 11 、 Figure 12 and Figure 15A flue locking member as shown. The mounting seat 101 of the flue locking member and the ear seat 111 hinged on the mounting seat 101 extend in the same direction, and their hinged ends are located at one end of the two. The pulling seat 103 and the locking bolt 105 provided on the pulling seat 103 extend in the other direction along the mounting seat 101 and the hinged end of the mounting seat 101, and the two ear seats 111 face the lug 113. The mounting seat 101 of the flue locking member can be symmetrically and fixedly installed on the left and right outer side walls of the end face 3. At this time, the flow guide cover 20 is provided with a hook groove 211 for the hook 108 to protrude, and the two hooks 108 are arranged relatively outward; the mounting seat 101 of the flue locking member can also be symmetrically and fixedly installed on the left and right outer side walls of the flow guide cover 20, and the two hooks 108 are arranged relatively outward. A locking bolt penetration hole is provided on the mounting disc, and the locking bolt 105 penetrates from the mounting disc surface at the air inlet end of the flue fire damper and is connected to the pulling seat 103. By tightening the locking bolt 105, the two hooks 108 open relatively outward and are clamped on the inner wall of the flue, thereby completing the installation and fixation of the flue fire damper. And the protrusion 107 provided on one side of the lock bar 102, the initial position of the protrusion 107 abuts against the wall surface of the mounting seat 101, so that the lock bar 102 has an opening angle relative to the mounting seat 101, which is convenient for the hook 108 to open relatively outward and be clamped on the inner wall of the flue.

[0040] Figure 13 , Figure 14 and Figure 15 Another flue locking member as shown. The mounting seat 101 of the flue locking member and the ear seat 111 are sequentially hinged together, the mounting seat 101 and the pulling seat 103 extend in the same direction, and the two ear seats 111 face the lug 113. The mounting seat 101 of the flue locking member can be symmetrically and fixedly installed on the left and right outer side walls of the end face 3. At this time, the flow guide cover 20 is provided with a hook groove 211 for the hook 108 to protrude, and the two hooks 108 are arranged relatively outward; the mounting seat 101 of the flue locking member can also be symmetrically and fixedly installed on the left and right outer side walls of the flow guide cover 20, and the two hooks 108 are arranged relatively outward. A locking bolt penetration hole is provided on the mounting disc, and the locking bolt 105 penetrates from the mounting disc surface at the air inlet end of the flue fire damper and is connected to the pulling seat 103. By tightening the locking bolt 105, the two hooks 108 open relatively outward and are clamped on the inner wall of the flue, thereby completing the installation and fixation of the flue fire damper. And the protrusion 107 provided on one side of the lock bar 102, the initial position of the protrusion 107 abuts against the left and right outer side walls of the end face 3 or abuts against the left and right outer side walls of the flow guide cover 20, so that the lock bar 102 has an opening angle relative to the left and right outer side walls of the end face 3 or the left and right outer side walls of the flow guide cover 20, which is convenient for the hook 108 to open relatively outward and be clamped on the inner wall of the flue.

[0041] Figure 16 The flue locking member shown has a structure identical to Figure 13The flue locking parts shown in FIGS. 1 - 15 are basically the same, except that: the tail end of the mounting seat 101 is bent outward to form a bent foot. The mounting seats 101 of the flue locking parts with this structure are symmetrically mounted on the mounting plate 26, the hook head 108 is arranged relatively outward, and the mounting plate is provided with holes for the locking bolts to pass through.

[0042] A specific structure of the high - temperature closing device with a locking mechanism is as follows: It includes a bracket 6 mounted on the outer end face of the end face 3. The bracket 6 is provided with a support shaft 7. One end of the support shaft 7 is provided with a threaded section. A notch is opened at one end of the support shaft 7 close to the valve plate 4. A valve plate pressing strip 14 is hinged in the notch through a hinge shaft 13. The valve plate pressing strip 14 is composed of two branches symmetrically arranged along the support shaft 7. The two valve plate pressing strips 14 are respectively arranged corresponding to the two valve plates 4. A lock pressing disc 11 corresponding to the valve plate pressing strip 14 is sleeved on the support shaft 7. A pressing disc spring 9 is sleeved on the support shaft 7. At the position of the bracket 6, there is a bimetallic strip 8 extending towards the lock pressing disc 11 and capable of separating at a set temperature. The bimetallic strip 8 is formed by welding two metal sheets with a welding material that can melt at a set temperature, or is made of a plug or a snap - in part 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 lock pressing disc 11 is provided with a claw 16 extending towards the bimetallic strip 8 and clamped on the bimetallic strip 8. The bimetallic strip 8 is provided with a corresponding card hole for the claw 16, or the bimetallic strip 8 is provided with a claw extending towards the pressing strip lock pressing disc 11 and clamped on the pressing strip lock pressing disc 11, and the pressing strip lock pressing disc 11 is provided with a corresponding card hole for the claw, so as to form a mutual locking relationship between the pressing strip lock pressing disc 11 and the bimetallic strip 8. In this embodiment, the bracket 6 is provided with a support shaft mounting hole. The bimetallic strip 8 is in the shape of a bent arm. One of the bent arms 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 on the bracket 6 through a nut. Of course, the bimetallic strip can be directly mounted on the bracket. One end of the lock pressing disc 11 facing the pressing disc spring 9 is provided with a sunk groove 17. The valve plate pressing strip 14 is provided with a catch 15 snapped in the sunk groove 17. After the lock pressing disc 11 separates from the bimetallic strip 8 and presses towards the valve plate pressing strip 14, there is a mutual locking mechanism between the lock pressing disc 11 and the valve plate pressing strip 14. This mutual locking mechanism is that the valve plate pressing strip 14 is wedge - shaped at its hinged end after being opened, and the lock pressing disc 11 and the corresponding end of the valve plate pressing strip 14 have a tapered cavity 12. The valve plate pressing strip 14 with a wedge - shaped hinged end and the valve plate pressing strip 14 with a tapered cavity 12 form a wedge - shaped lock. See Figure 6 、 Figure 7, the valve plate pressing strip 14 is in the shape of a crank arm, the locking pressure plate 11 is generally cylindrical, and the two valve plate pressing strips 14 are symmetrically arranged outside the locking pressure plate 11. When the two valve plate pressing strips 14 are in the locked state, the hooks 15 provided on the valve plate pressing strip 14 (which are located on the relatively inner side of the valve plate pressing strip 14 at this time) are buckled in the sunk grooves 17 of the locking pressure plate 11, and one section of the crank arm of each of the two valve plate pressing strips 14 is arranged axially parallel to the support shaft 7; when the two valve plate pressing strips 14 are opened, an included angle is formed at the hinge end on the relatively outer sides of the two valve plate pressing strips 14, and the inner taper angle of the conical cavity 12 of the locking pressure plate 11 is consistent with the included angle formed by the two valve plate pressing strips 14, and a wedge-shaped lock is formed between the inner conical surface of the conical cavity 12 of the locking pressure plate 11 and the relatively outer sides of the two valve plate pressing strips 14. When the flue gas temperature in the common flue gas passage reaches the set warning temperature, the solder between the bimetal sheets 8 melts, and one of them falls off the other, and the locking pressure plate 11 is released from the restraint of the bimetal sheets 8 and slides along the support shaft 7 under the action of the pressure plate spring 9. At this time, the hooks 15 on the valve plate pressing strip 14 are disengaged from the sunk grooves 17 of the locking pressure plate 11, and the locking pressure plate 11 presses against the two valve plate pressing strips 14 and causes the two valve plate pressing strips 14 to open outward and press on the two valve plates 4. Since a wedge-shaped lock is formed between the valve plate pressing strip 14 and the locking pressure plate 11 with the conical cavity 12, the valve plate 4 is always in the closed state.

[0043] In the foregoing embodiment, the flue gas fire damper has an air outlet end face adapted to the flue gas passage, and there are two air outlets on the end face. A rotatable valve plate that can only open in the air outlet direction and corresponds to the air outlet is provided on the end face. The high-temperature closing device for forcibly closing the valve plate is Figure 5 the double-leg structure shown. In actual application, due to the diversity of the structure of the flue gas fire damper itself, for example: the valve plate is arranged in the flue gas passage of the fire damper, the flue gas passage can also be a variable-diameter passage, the valve plate can be two or one, and the opening direction of the valve plate can be opposite opening, side opening, upward opening, downward opening, etc. To adapt to the forced closing of the valve plates of flue gas fire dampers with different structures, the high-temperature closing device for forcibly closing the valve plates can also adopt a single-leg structure, that is, Figure 5Remove the left or right leg of the middle bracket 6, and only keep one leg, which is convenient for installing the high-temperature closing device at the corresponding position of the flue fire damper. For example, it can be installed on the end face of the air outlet through the support feet with the ends of the legs folded outwards, or on the mounting plate of the flue fire damper, or 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 such that a support shaft 7 is provided on the bracket 6, a locking pressure plate 11 is sleeved on the support shaft 7, a pressure plate compression spring 9 is sleeved on the support shaft 7 between the locking pressure plate 11 and the bracket 6, a bimetallic strip 8 that extends towards the locking pressure plate 11 and can melt or separate at a set temperature is provided on the bracket 6, the locking pressure plate 11 is provided with a claw 16 that extends towards 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 common flue reaches the set warning temperature, the solder between the bimetallic strips melts, and one of them falls off from the other. The locking pressure plate 11 is released from the restraint of the bimetallic strip and slides along the support shaft 7 under the action of the pressure plate compression spring 9. The locking pressure plate 11 presses on the valve plate 4, and the valve plate 4 is in the closed state; at this time, as long as the outer diameter of the locking pressure plate 11 is adapted to the valve plate 4, it can be adapted to both the single-valve-plate flue fire damper and the double-valve-plate flue fire damper; it can be a single-leg structure bracket or a double-leg structure bracket. Hinging a valve plate pressing strip 14 corresponding to the locking pressure plate 7 at one end of the support shaft 7 close to the valve plate 4 is a further optimization of the foregoing structure. The valve plate pressing strip 14 can be two branches symmetrically arranged along the support shaft 7, corresponding to the fire damper for forcibly closing two valve plates, or it can be one branch, corresponding to the fire damper for forcibly closing a single valve plate. A sunken groove 17 is provided at one end of the locking pressure plate 11 facing the pressure plate compression spring 9, and a hook 15 that is buckled in the sunken groove 17 is provided on the valve plate pressing strip 14. After the locking pressure plate 11 is released from the bimetallic strip 8 and presses towards the valve plate pressing strip 14, the valve plate pressing strip 14 opens outwards and presses on the valve plate 4. Since a wedge-shaped lock is formed between the valve plate pressing strip 14 and the locking pressure plate 11 with a conical cavity 12, the valve plate 4 is always in the closed state.

[0044] Another specific structure of the high-temperature closing device with a locking mechanism is: including a bracket 6 installed on the outer end face of the end face 3, see Figure 8, the bracket 6 has a two-leg structure, or the left leg or the right leg of the bracket 6 can be removed, leaving only one leg. A support shaft 7 is provided on the bracket 6. One end of the support shaft 7 close to the valve plate 4 is hinged with a valve plate pressing strip 14. The valve plate pressing strip 14 is provided with two branches symmetrically arranged along the support shaft 7. The two valve plate pressing strips 14 are respectively arranged corresponding to the two valve plates 4. A locking pressure disc 11 corresponding to the valve plate pressing strip 14 is sleeved on the support shaft 7. A pressure disc compression spring 9 is sleeved on the support shaft 7. A bimetallic strip 8 that can be separated at a set temperature and extends towards the locking pressure disc 11 is provided at the bracket 6 part. The bimetallic strip 8 can also be replaced by a heat-melting sheet that can be melted at a set temperature. The locking pressure disc 11 is provided with a claw 16 that extends towards the bimetallic strip 8 and is clamped on the bimetallic strip 8. 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 towards the strip locking pressure disc 11 and is clamped on the strip locking pressure disc 11. The strip locking pressure disc 11 is provided with a clamping hole corresponding to the claw, so that a mutual locking relationship is formed between the strip locking pressure disc 11 and the bimetallic strip 8. An inwardly arranged valve plate pressing strip guiding groove 19 is provided along the relatively outer side of the locking pressure disc 11. A clamping groove 18 is provided inside the valve plate pressing strip guiding groove 19. A hook 15 that is buckled in the clamping groove 18 is provided on the valve plate pressing strip 14. In this embodiment, the structures of the support shaft 7, the hinged structure of the valve plate pressing 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. Refer to Figure 9 , Figure 10, the locking pressure plate 11 is generally strip-shaped as a whole. A hole sleeved with the support shaft 7 is provided in the middle part of the strip-shaped locking pressure plate 11. Valve strip guide grooves 19 are provided inwardly at both ends along the length direction of the strip-shaped locking pressure plate 11. Claw grooves 18 are provided at the relative inner ends of the two valve strip guide grooves 19. A claw 16 is provided on one side in the width direction of the strip-shaped locking pressure plate 11. Both ends of the locking pressure plate 11 in the length direction are bent towards the same side at the intersection of the valve strip guide groove 19 and the claw groove 18. When the two valve strips 14 are in the locked state, the hooks 15 provided on the valve strips 14 (which are located on the relative inner sides of the valve strips 14 at this time) are buckled in the claw grooves 18 of the locking pressure plate 11. The two valve strips 14 are respectively located in the guide grooves 19. The claw groove 18 and the guide groove 19 are separated by a partition strip. When the two valve strips 14 are opened, the two valve strips 14 are generally in a symmetric and parallel state. The outer edge of the partition strip between the claw groove 18 and the guide groove 19 is buckled in the hook 15, so that the two valve strips 14 are in the locked state. When the flue gas temperature in the common flue gas duct reaches the set warning temperature, the solder between the bimetal sheets 8 melts, and one of them falls off from the other. The locking pressure plate 11 is released from the restraint of the bimetal sheets 8 and slides along the support shaft 7 under the action of the pressure plate spring 9. At this time, the hook 15 on the valve strip 14 forms a chute with the relative inner side surface of the valve strip 14 during the unfolding process of the valve strip 14. The outer edge of the partition strip slides along this chute. The locking pressure plate 11 presses against the two valve strips 14 and causes the two valve strips 14 to open outward and press on the two valve sheets 4. Since the valve strips 14 are in the locked state, the valve sheets 4 are always in the closed state.

[0045] The valve sheet 4 can be hinged to the bracket 6 through a hinge, or can be hinged to the end face 3 through a hinge. There can be one air outlet 5, and the corresponding valve sheet 4 is one piece.

[0046] The specific structure of the above embodiment is for explaining the present invention, rather than limiting the present invention. All improvements based on the present invention should fall within the protection scope of the present invention.

Claims

1. A flue fire damper, comprising a flue gas passage formed by a housing (1), one end of the flue gas passage having an air inlet (2), and the opposite end being an air outlet end. A rotatable valve plate (4) that can only open in the air outlet direction is provided in the flue gas passage or on the end face of the air outlet end, and the characteristics are A flue locking member (21) capable of fixing the outer shell (1) to a flue is provided on the outer shell (1). The air outlet end is provided with an end face (3) adapted to the flue gas passage. An air outlet (5) is provided on the end face (3), and the flue locking member (21) is arranged on the end face (3). The flue locking member (21) includes a mounting base (101). An ear seat (111) is provided at one end of the mounting base (101). A locking bar (102) is hinged on the ear seat (111). The free end of the locking bar (102) has a hook head (108) bent towards one side of the locking bar (102). A lug (113) extending out of one side of the locking bar (102) is provided at the end of the locking bar (102) close to the ear seat (111). A pulling seat (103) is hinged on the lug (113), and a locking bolt (105) is provided on the pulling seat (103).

2. The flue fire damper according to claim 1, and the characteristics are The lug (113) and the hook head (108) are located on the same side of the locking bar (102), and a protrusion (107) is provided at a substantially middle position on the other side of the locking bar (102).

3. The flue fire damper according to claim 1 or 2, and the characteristics are A flow guide cover (20) consistent with the flue direction is provided at the air outlet end of the flue gas passage. The mounting base (101) is fixed on the left and right outer side walls of the end face (3). A hook head groove (211) for the hook head (108) to extend out is provided on the flow guide cover (20). The hook head (108) is arranged relatively outward, and a locking bolt penetration hole is provided on the outer shell (1).

4. The flue fire damper according to claim 1 or 2, and the characteristics are A flow guide cover (20) consistent with the flue direction is provided at the air outlet end of the flue gas passage. The mounting base (101) is fixed on the left and right outer side walls of the flow guide cover (20). The hook head (108) is arranged relatively outward, and a locking bolt penetration hole is provided on the outer shell (1).

5. The flue fire damper according to claim 1 or 2, and the characteristics are A mounting disc is provided on the outer wall of the outer shell (1). The mounting bases (101) are symmetrically mounted on the mounting disc. The hook heads (108) are arranged relatively outward, and a locking bolt penetration hole is provided on the mounting disc.

6. The flue fire damper according to claim 1 or 2, and the characteristics are A high-temperature closing device with a locking mechanism is provided on the end face (3) and can force the valve plate (4) to close towards the air inlet (2) side at a set temperature, so that the valve plate (4) is always in a closed state.

7. The flue fire damper according to claim 6, and the characteristics are The high-temperature closing device with a locking mechanism includes a bracket (6) mounted on the outer end face of the end face (3). A support shaft (7) is provided on the bracket (6). A locking pressure disc (11) is sleeved on the support shaft (7). A pressure disc compression spring (9) is sleeved on the support shaft (7). A heat-melting sheet or a separated bimetallic sheet (8) that can melt at a set temperature and extends towards the locking pressure disc (11) is provided at the bracket (6) part. The locking pressure disc (11) and the heat-melting sheet or the bimetallic sheet (8) are interlocked with each other.

8. The flue fire damper according to claim 7, and the characteristics are One end of the described support shaft (7) close to the valve plate (4) is hinged with a valve plate pressing strip (14). The locking pressure plate (11) is arranged corresponding to the valve plate pressing strip (14). A sunken groove (17) is provided at one end of the locking pressure plate (11) facing the pressure plate compression spring (9). A hook (15) buckled in the sunken groove (17) is provided on the valve plate pressing strip (14). After the locking pressure plate (11) disengages from the bimetallic strip (8) and presses towards the valve plate pressing strip (14), an interlocking mechanism is provided between the locking pressure plate (11) and the valve plate pressing strip (14).

9. The flue fire damper according to claim 8, and the characteristics are The described interlocking mechanism is that after the valve plate pressing strip (14) is opened, it is wedge-shaped at its hinged end. The corresponding end of the locking pressure plate (11) and the valve plate pressing strip (14) has a tapered cavity (12). The valve plate pressing strip (14) with a wedge-shaped hinged end and the valve plate pressing strip (14) with a tapered cavity (12) form a wedge-shaped lock.

10. The flue fire damper according to claim 6, and the characteristics are The described high-temperature closing device with a locking mechanism includes a bracket (6) installed on the outer end surface of the end face (3). A support shaft (7) is provided on the bracket (6). One end of the support shaft (7) close to the valve plate (4) is hinged with a valve plate pressing strip (14). A locking pressure plate (11) corresponding to the valve plate pressing strip (14) is sleeved on the support shaft (7). A pressure plate compression spring (9) is sleeved on the support shaft (7). A hot-melt sheet or a separated bimetallic strip (8) that can melt at a set temperature and extends towards the locking pressure plate (11) is provided at the bracket (6) part. The locking pressure plate (11) and the bimetallic strip (8) are interlocked with each other. A valve plate pressing strip guiding groove (19) arranged inward is provided along the relatively outer side of the locking pressure plate (11). A clamping groove (18) is provided inside the valve plate pressing strip guiding groove (19). A hook (15) buckled in the clamping groove (18) is provided on the valve plate pressing strip (14).

11. The flue fire damper according to claim 6, and the characteristics are There are two described air outlets (5), which are symmetrically arranged left and right on the end face of the air outlet end. The end face of the air outlet end and the upper ends of the two valve plates (4) are inclined towards the air inlet (2).

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