CN210716177U - Flue non-return fire prevention valve and flue system with same - Google Patents

Abstract

The utility model discloses a flue non-return fire damper and a flue system with the same, which comprises an installation disc with a through hole, wherein the front surface of the installation disc is provided with an air inlet channel, the back surface of the installation disc is correspondingly provided with an air outlet end face, an air outlet is arranged on the air outlet end face, a valve seat is arranged on the air outlet end face, and a rotatable valve plate which can only be opened towards the air outlet direction is hinged on the valve seat; the end face of the air outlet end is provided with a high-temperature closing device which can forcibly close the valve plate to the air inlet side at a set temperature and is provided with a locking mechanism through a support, so that the valve plate is always in a closed state; the support is provided with a spring corresponding to the valve plate, and the spring is positioned on the back side of the valve plate. The utility model discloses because valve block and high temperature closing device are respectively through disk seat and support mounting on the end face is held to the wind, be convenient for installation, adjustment valve block and high temperature closing device, mutual interference's phenomenon can not appear between the two, is equipped with the spring that corresponds with the valve block on the support, guarantees that the valve block can in time and easily close.

Description

Flue non-return fire prevention valve and flue system with same

Technical Field

The utility model relates to a flue non-return fire prevention valve and flue system that has it that use in the kitchen of public flue gas flue.

Background

In a kitchen using a longitudinal public flue, in order to prevent oil smoke in the flue from flowing back into the kitchen, a device such as a flue check fire damper is generally arranged between an air outlet pipe orifice of a range hood and the public flue, the existing flue check fire damper generally comprises a flue channel formed by a shell, the flue channel is provided with an air inlet and an air outlet which are opposite, the air outlet pipe orifice of the range hood is connected to the air inlet, the air outlet extends into the public flue, a valve plate capable of being opened and closed is arranged at the air outlet of the flue channel, one or two valve plates are hinged on the flue channel through a valve plate rotating shaft, and a high-temperature closing device capable of forcibly closing the valve plates is arranged on the air outlet side. When the range hood is not used, the valve plate is in a closed position due to the gravity of the valve plate and covers the air outlet part; when the range hood is used, the valve plate is in the opening position, and the valve plate is far away from the air outlet. However, the existing valve plate and the high-temperature closing device are installed on a support, so that the manufacturing and the adjustment are inconvenient, and the phenomenon of mutual interference can also occur. In addition, the existing flue check fire damper is generally characterized in that an elastic clamp or an elastic sheet is arranged on a shell on one side, facing an air outlet, of the shell, and the flue check fire damper is clamped on an air inlet of a flue gas channel through the elastic clamp or the elastic sheet, so that the flue check fire damper is not tightly attached to the wall surface of the flue gas channel and is easy to loosen, and the ventilation phenomenon occurs at the joint of the flue check fire damper and the air inlet of the flue gas channel; the other installation mode is to punch a hole on the wall surface of the flue, and install the flue check fire damper on the air inlet of the flue through a screw, and the installation and fixation mode is easy to damage the ceramic tiles on the wall surface of the flue and cause the ceramic tiles to crack or crack; the above modes all have the defects that the installation and the replacement of the flue check fire damper are inconvenient.

In addition, as a plurality of users share one longitudinal public flue gas channel, once a fire disaster happens to one user, a large amount of high-temperature harmful gas flows into the longitudinal public flue gas channel, and if a valve plate in the flue check fire-proof valve is not closed in time, the large amount of high-temperature harmful gas can enter the user using the range hood through the flue gas channel of the flue check fire-proof valve, so that the life safety of the user is threatened. The outer end face of an air outlet end of an existing flue non-return fireproof valve is provided with a high-temperature closing device which can enable a valve block to be forcibly closed towards an air inlet side at a set temperature, and when the temperature of smoke in a public flue is in a very high emergency state and reaches a set warning temperature, the high-temperature closing device enables the valve block in an open state to be forcibly closed. However, the valve plate is closed by the high-temperature closing device on the existing flue check fire-proof valve by the aid of the force of the spring, when the high temperature is continuously reached to a certain time in the public flue, the spring loses effectiveness due to high temperature, the valve plate loses the restriction force of the spring and can be opened again, and high-temperature harmful gas can flow into a user home, so that life safety of the resident is threatened.

Disclosure of Invention

The first technical problem to be solved by the utility model is to provide a flue non-return fire-proof valve with convenient installation and adjustment of valve plates; the second technical problem to be solved by the utility model is to provide a flue non-return fire-proof valve with a valve plate easy to close; meanwhile, the flue check fire damper is convenient to install and fix on a public flue, the flue can be forcibly closed when the temperature of flue gas in the public flue is in a very high emergency state, and a valve plate of the fire damper is always in a closed state; the utility model discloses another technical problem that solves provides a flue system who has above-mentioned flue non-return fire prevention valve.

In order to solve the first technical problem, the utility model comprises a mounting plate with through holes, which is structurally characterized in that the front side of the mounting plate is provided with an air inlet channel, an air outlet is arranged in the air inlet channel, a valve seat is arranged in the air inlet channel or on the mounting plate, and a rotatable valve plate which can only be opened towards the air outlet direction is hinged on the valve seat; and a high-temperature closing device which can forcibly close the valve plate to the air inlet side at a set temperature and is provided with a locking mechanism is arranged in the air inlet channel or on the mounting disc through a support, so that the valve plate is always in a closed state.

Or the utility model comprises a mounting disc with through holes, which is structurally characterized in that the front side of the mounting disc is provided with an air inlet channel, the back side of the mounting disc is correspondingly provided with an air outlet end face, an air outlet is arranged on the air outlet end face, the air outlet end face or the mounting disc is provided with a valve seat, and the valve seat is hinged with a rotatable valve plate which can only be opened towards the air outlet direction; and the end face of the air outlet end or the mounting disc is provided with a high-temperature closing device which can forcibly close the valve plate to the air inlet side at a set temperature and is provided with a locking mechanism through a support, so that the valve plate is always in a closed state.

The valve seats are arranged at the left middle position and the right middle position of the outer end face of the air outlet end face or the back face of the mounting disc, the two valve seats are arranged at intervals up and down, and the valve plates are hinged with the valve seats through pin shafts or hinge shafts.

In order to solve the second technical problem, the utility model comprises a mounting plate with through holes, which is structurally characterized in that the front side of the mounting plate is provided with an air inlet channel, an air outlet is arranged in the air inlet channel, and a rotatable valve plate which can only be opened towards the air outlet direction is arranged in the air inlet channel or on the mounting plate; the air inlet channel or the mounting disc is provided with a high-temperature closing device which can forcibly close the valve plate to the air inlet side at a set temperature and is provided with a locking mechanism through a support, so that the valve plate is always in a closed state, the support is provided with a spring corresponding to the valve plate, and the spring is positioned on the back side of the valve plate.

Or the utility model comprises a mounting disc with through holes, which is structurally characterized in that the front side of the mounting disc is provided with an air inlet channel, the back side of the mounting disc is correspondingly provided with an air outlet end face, an air outlet is arranged on the air outlet end face, and the air outlet end face or the mounting disc is provided with a rotatable valve plate which can only be opened towards the air outlet direction; the air outlet end face or the mounting disc is provided with a high-temperature closing device which can enable the valve plate to be forcibly closed towards the air inlet side at a set temperature and is provided with a locking mechanism through a support, so that the valve plate is always in a closed state, the support is provided with a spring corresponding to the valve plate, and the spring is located on the back side of the valve plate.

The spring is two branches that bilateral symmetry set up, and two branches spring passes through screw or fix with rivet on the support, and two branches spring has the resilience force that makes the valve block close.

The back of the mounting disc is provided with a flow guide cover, the back of the mounting disc in the left and right cover walls of the flow guide cover is symmetrically provided with fireproof valve locking pieces, and the left and right cover walls of the flow guide cover are provided with hook grooves for extending the fireproof valve locking pieces.

The fire prevention valve locking piece include the spacing sleeve of fixed mounting at the mounting disc back, be equipped with the bolt that penetrates from the mounting disc front in the spacing sleeve, the spiro union has the hook piece in the bolt, the hook piece is relative overhanging in the eave tile groove, the hook piece passes through the bolt pulling chucking on the inner wall of flue gas flue.

The hook head groove is in a corner shape and is provided with a straight groove section which is horizontally arranged and a vertical groove section which is vertically and upwards arranged along the inner end part of the straight groove section, and the straight groove section and the vertical groove section of the hook head groove are in smooth transition.

The outer end of the hook is provided with a raised hook head facing the mounting disc.

The high-temperature closing device with the locking mechanism comprises a supporting shaft arranged on a support, wherein a locking pressure plate is sleeved on the supporting shaft, a pressure plate pressure spring is sleeved on the supporting shaft, a hot melting piece or a separated bimetallic strip which extends to the locking pressure plate and can be melted at a set temperature is arranged at the position of the support, and the pressing strip locking pressure plate and the hot melting piece or the bimetallic strip are interlocked.

The valve block pressing device is characterized in that one end, close to a valve block, of the supporting shaft is hinged with a valve block pressing strip, the locking pressing plate and the valve block pressing strip are correspondingly arranged, a sinking groove is formed in one end, facing the pressing plate pressing spring, of the locking pressing plate, a clamping hook is arranged on the valve block pressing strip, the locking pressing plate is separated from a bimetallic strip and presses the valve block pressing strip, and a mechanism for locking the locking pressing plate and the valve block pressing strip mutually is arranged between the locking pressing plate and the valve block.

The mutual locking mechanism is that the valve plate pressing strip is opened and then is in a wedge shape at the hinged end, the corresponding ends of the locking pressure plate and the valve plate pressing strip are provided with conical cavities, and the hinged end is in a wedge shape and forms wedge-shaped locking with the valve plate pressing strip with the conical cavities.

The valve plate is characterized in that an inclined plane bulge is arranged on the back surface of the valve plate, the inclined plane bulge is arranged up and down at the approximate middle position in the left-right direction of the valve plate, and an inclined plane corresponding to the inclined plane bulge is arranged at the end part of the valve plate pressing strip.

The air outlet is provided with two air outlets which are arranged symmetrically left and right on the end surface of the air outlet end, the sealing ring is sleeved on the edge of the air outlet, and the end surface of the air outlet end and the upper ends of the two valve plates incline towards the direction of the air inlet.

The end face is provided with an air outlet, the valve block is one piece, and one side of the valve block is hinged to the end face.

And the valve plate is hinged on the end surface of the left side or the right side of the air outlet.

The valve plate is hinged on the end face of the upper side or the lower side of the air outlet.

The end face is provided with an air outlet, the valve plate on the air outlet is divided into a large part and a small part, wherein the smaller part of the valve plate is fixed on the air outlet, and the larger part of the valve plate is hinged on the smaller part of the valve plate.

The utility model discloses a flue system, which comprises a public flue, wherein the set part of the public flue is provided with a flue check fire damper mounting port; the flue check fire-proof valve is arranged in the flue check fire-proof valve mounting opening.

After the structure is adopted, the valve plate and the high-temperature closing device are respectively arranged on the end face of the wind end through the valve seat and the support, the valve seat for installing the valve plate and the support are mutually independent, the mutual interference phenomenon between the opening and closing of the valve plate and the high-temperature closing device can not occur, the installation and the adjustment are convenient, and the stability of the valve plate and the high-temperature closing device is not influenced mutually; the support is provided with a spring which corresponds to the valve block and gives the valve block certain initial closing elasticity, so that the valve block can be ensured to be closed timely and easily. The air outlet end of the flue gas channel is provided with a flow guide cover which is consistent with the direction of flue gas flow, so that the exhaust direction of flue gas is consistent with the direction of flue gas flow, and the smoothness of a public flue gas channel is not influenced; fireproof valve locking pieces are symmetrically arranged on the back surfaces of the mounting discs in the left and right cover walls of the diversion cover, so that the flue check fireproof valve is conveniently mounted and fixed on the common flue gas channel; the hook piece is pulled to move along the hook head groove through the locking bolt, so that the hook piece is clamped on the inner wall of the flue gas channel, and the hook is stable in structure and convenient to install, fix and replace. And the end face is provided with a high-temperature closing device which can forcibly close the valve plate to the air inlet side at a set temperature and is provided with a locking mechanism, when the temperature of the flue gas in the public flue gas channel is in a very high emergency state and reaches a set warning temperature, the valve plate in the open state is forcibly closed by the high-temperature closing device, and the valve plate of the fire-proof valve is always in a locking closed state, so that the life safety of residents is protected. The two air outlets are symmetrically arranged on the left side and the right side of the end surface of the air outlet end, and the end surface of the air outlet end and the upper ends of the two valve plates incline towards the direction of the air inlet, so that the two valve plates can be naturally closed by means of self gravity; the sealing ring is sleeved on the edge of the air outlet, so that the noise of opening and closing the valve plate can be reduced, and the sealing is relatively kept.

Drawings

The following detailed description of embodiments of the invention is provided in conjunction with the accompanying drawings:

FIG. 1 is a schematic longitudinal sectional view of the present invention;

FIG. 2 is a schematic diagram of the structure of FIG. 1 viewed from the right;

FIG. 3 is a schematic view of the cross-sectional structure A-A of FIG. 2;

FIG. 4 is a schematic structural view of the fire damper locking member of the present invention;

FIG. 5 is a schematic top view of FIG. 4;

FIG. 6 is a schematic structural view of a fire damper lock in use;

FIG. 7 is a schematic structural view of the high temperature shut-off device of the present invention;

FIG. 8 is a schematic view of the cross-sectional structure B-B of FIG. 7;

FIG. 9 is a state diagram of the valve plate bead of FIG. 8 shown in an open position;

FIG. 10 is a schematic cross-sectional view of the structure of FIG. 2;

FIG. 11 is another schematic view of the right side view of FIG. 1;

FIG. 12 is a schematic view of a further alternative construction to the right of FIG. 1;

FIG. 13 is a schematic view of another embodiment of the right side view of FIG. 1;

fig. 14 is a schematic longitudinal sectional view of another embodiment of the present invention;

FIG. 15 is a schematic diagram of the structure of a flue system with a flue check fire damper.

Detailed Description

Referring to fig. 1-3, this flue non-return fire prevention valve includes mounting disc 26 that has the through-hole, mounting disc 26 openly is equipped with inlet channel 1, inlet channel 1 one end has air intake 2, the relative other end is the air-out end, mounting disc 26 back correspondence is equipped with air-out end terminal surface 3, be equipped with air outlet 5 on the air-out end terminal surface 3, air outlet 5 is two, bilateral symmetry sets up on the terminal surface of air-out end, 5 mouths of air outlet are along last cover and are equipped with sealing washer 25, be equipped with disk seat 23 on end terminal surface 3, it has rotatable valve block 4 that only can open to the air-out direction to articulate on the disk seat 23, of course, disk seat 23 can also. The outer end face of the air outlet end face 3 is provided with a high-temperature closing device which can enable the valve sheet 4 to be forcibly closed towards the air inlet side at a set temperature and is provided with a locking mechanism through a support 6, so that the valve sheet 4 is always in a closed state, the end face of the air outlet end and the upper ends of the two valve sheets 4 incline towards the direction of the air inlet 2, the valve seat 23 and the support 6 are arranged at the left middle position and the right middle position of the outer end face of the air outlet end face 3, the valve seat 23 is two in up-down interval arrangement, the valve sheet 4 is hinged with the valve seat 23 through a pin shaft or a hinge shaft, the two valve seats 23 are positioned at the opposite inner sides of the upper support. The sealing ring is sleeved on the edge of the air outlet, so that the noise of opening and closing the valve plate can be reduced, and the sealing is relatively kept. And valve block 4 articulates on disk seat 23, and the high temperature closing device who has locking mechanical system passes through support 6 and sets up on the outer terminal surface of air-out end terminal surface 3 for the disk seat 23 and the support 6 mutually independent setting of installation valve block 4, the phenomenon that mutual interference can not appear between opening and close and the high temperature closing device of valve block 4, and installation, adjustment are convenient, do not influence its stability mutually between valve block and the high temperature closing device. In order to overcome the problem that the existing valve plate is closed by self gravity, when the public flue gas channel is in a negative pressure state, the valve plate can not be closed in time, a spring 27 corresponding to the valve plate 4 is arranged on a support 6, the spring 27 is positioned on the back side of the valve plate 4, the spring 27 is two branches symmetrically arranged left and right and respectively corresponding to the two valve plates 4, the two springs 27 are fixed on the support 6 through screws or rivets, the two springs 27 can be arranged on an upper supporting leg of the support 6 or a lower supporting leg of the support 6, one of the two springs 27 can be arranged on the upper supporting leg of the support 6, the other one can be arranged on the lower supporting leg of the support 6, the two springs 27 have certain resilience and are positioned on the back side above the valve plate 4, when the valve plate 4 is in an opening state, the spring 27 abuts against the back side of the valve plate 4, and the valve plate 4 has resilience for closing, when the valve plate 4 is to be closed, the spring 27 gives a certain initial closing elastic force to the valve plate 4 to ensure that the valve plate can be closed in time, and the spring 27 can be an elastic piece. The mounting plate 26, the air inlet channel 1 and the air outlet end face 3 are respectively riveted or welded together after being processed and molded. The back of the mounting disc 26 is also provided with a diversion cover 20 which is consistent with the direction of flue gas flow, the back of the mounting disc 26 in the left and right cover walls of the diversion cover 20 is symmetrically provided with fireproof valve locking pieces 21 so as to install and fix a flue check fireproof valve on a public flue gas channel, and the diversion cover 20 is arranged to enable the discharge direction of flue gas to be consistent with the direction of flue gas flow, so that the smoothness of the public flue gas channel is not influenced. The cross section of the air guide sleeve 20 is approximately U-shaped, and hook grooves 22 for extending the fire-proof valve locking pieces 21 are arranged on the left and right cover walls of the air guide sleeve 20.

The fire damper locking member 21 shown in fig. 4-6 comprises a limiting sleeve 24 fixedly mounted on the back of a mounting disc 26, the fixing mode can be welding or riveting, the length of the limiting sleeve 24 is matched with the wall thickness of a public flue gas channel, a bolt 10 penetrating from the front of the mounting disc 26 is arranged in the limiting sleeve 24, a bolt penetrating hole corresponding to the inner hole of the limiting sleeve 24 is arranged on the mounting disc 26, a hook 16 is screwed at the inner end of the bolt 10, the hook 16 is a plate body and is provided with a base 19, a through threaded hole 18 is formed in the base 19, the axis of the hook 16 and the axis of the threaded hole 18 are in the same plane, a raised hook head is arranged at the end of the hook 16, and faces the mounting disc. The hook piece 16 extends outwards from the hook head groove 22, and the hook piece 16 is pulled to be clamped on the inner wall of the flue gas channel through the bolt 10. The hook groove 22 is in a corner shape and has a straight groove section horizontally arranged and a vertical groove section vertically and upwardly arranged along the inner end of the straight groove section, and the straight groove section and the vertical groove section are in smooth transition. During installation, the bolt 10 penetrates out of the locking bolt penetrating hole and the limiting sleeve 24 from the outer side of the installation disc 26 and is connected to the threaded hole 18 in the base 19, at the moment, the base 19 is located in the inner sides of the hook grooves 22 on the left side and the right side of the air guide sleeve 20, the hook piece 16 extends outwards relatively and is in a horizontal state, the lower groove of the straight groove section is used for bearing the hook piece 16 to enable the hook piece 16 to keep in the horizontal state, namely the two fireproof valve locking pieces 21 are symmetrically arranged on the fireproof valve, the hook head protruding at the end part of the hook piece 16 faces the installation disc 26, and the bolt 10 is screwed down, so that the hook head protruding at the end part of the hook piece 16 presses the inner wall of the.

The high-temperature closing device shown in fig. 7-9 comprises a supporting shaft 7 mounted on a bracket 6, wherein one end of the supporting shaft 7 is provided with a threaded section, one end of the supporting shaft 7, which is close to a valve plate 4, is provided with a notch, a valve plate pressing strip 14 is hinged in the notch through a hinge shaft 13, the valve plate pressing strips 14 are two branches symmetrically arranged along the supporting shaft 7, the two valve plate pressing strips 14 are respectively arranged corresponding to the two valve plates 4, a locking and pressing disc 11 corresponding to the valve plate pressing strip 14 is sleeved on the supporting shaft 7, the supporting shaft 7 is sleeved with a pressure plate pressure spring 9, the position of the bracket 6 is provided with a bimetallic strip 8 which extends to the lock pressure plate 11 and can be separated at a set temperature, the bimetallic strip 8 is formed by welding two metal strips through welding materials which can be melted at the set temperature, or a bolt or a card made of hot melting materials which can be melted at the set temperature is inserted together, and the bimetallic strip 8 can also be replaced by the hot melting strip which can be melted at the set temperature. The locking pressure plate 11 is provided with a claw 16 which extends to 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 which extends to the locking pressure plate 11 and is clamped on the locking pressure plate 11, and the locking pressure plate 11 is provided with a clamping hole corresponding to the claw, so that the locking pressure plate 11 and the bimetallic strip 8 form a mutual locking relation. In this embodiment, be equipped with the back shaft mounting hole on the support 6, bimetallic strip 8 is the turning arm form, is equipped with the mounting hole that corresponds with the back shaft mounting hole on the support 6 on one of them turning arm, and bimetallic strip 8 suit is on back shaft 7, and back shaft 7 passes through the nut to be fixed on support 6, and of course, bimetallic strip 8 can the direct mount on support 6. One end of the locking pressure plate 11, which faces the pressure plate pressure spring 9, is provided with a sunken groove 17, a clamping hook 15 which is clamped in the sunken groove 17 is arranged on the valve plate trim strip 14, the locking pressure plate 11 is separated from the bimetallic strip 8 and pressed towards the valve plate trim strip 14, a mutual locking mechanism is arranged between the locking pressure plate 11 and the valve plate trim strip 14, the mutual locking mechanism is that the valve plate trim strip 14 is opened and then is in a wedge shape at the hinged end, the corresponding ends of the locking pressure plate 11 and the valve plate trim strip 14 are provided with conical cavities 12, and the hinged end is in a wedge shape, so that the valve plate trim strip 14 and the valve plate trim strip 14 with the conical. Referring to fig. 8 and 9, the valve plate beads 14 are crank-shaped, the locking plate 11 is substantially cylindrical, the two valve plate beads 14 are symmetrically arranged on the outer sides of the locking plate 11, when the two valve plate beads 14 are in a locking state, the hooks 15 (located on the opposite inner sides of the valve plate beads 14 at this time) arranged on the valve plate beads 14 are buckled in the sinking grooves 17 of the locking plate 11, and one crank arm of each of the two valve plate beads 14 is axially parallel to the support shaft 7; after the two valve pressing strips 14 are opened, the opposite outer side faces of the two valve pressing strips 14 form an included angle at the hinged end, the inner cone angle of the conical cavity 12 of the locking pressing disc 11 is consistent with the included angle formed by the two valve pressing strips 14, and wedge-shaped locking is formed between the inner cone surface of the conical cavity 12 of the locking pressing disc 11 and the opposite outer side faces of the two valve pressing strips 14. When the temperature of the smoke in the public smoke channel reaches the set warning temperature, the soldering tin between the bimetallic strips 8 is melted, one of the bimetallic strips falls off from the other bimetallic strip, the locking pressing disc 11 is separated from the constraint of the bimetallic strips 8 and slides along the supporting shaft 7 under the action of the pressing disc compression spring 9, at the moment, the clamping hook 15 on the valve plate pressing strip 14 is separated from the sinking groove 17 of the locking pressing disc 11, the locking pressing disc 11 presses the two valve plate pressing strips 14, the two valve plate pressing strips 14 are outwards opened and pressed on the two valve plates 4, and the valve plates 4 are always in a closed state due to the wedge-shaped locking formed between the valve plate pressing strips 14 and the locking pressing disc 11 with the.

The flue non-return fire-proof valve shown in figure 10 is basically the same as the structure, except that: the back surface of the valve plate 4 is provided with an inclined plane bulge 28, the inclined plane bulge 28 is arranged up and down (up and down in fig. 2, namely the height of the valve plate 4) at the approximate middle position of the left and right direction (the left and right direction in fig. 2, namely the width of the valve plate 4) of the valve plate 4, namely the back surface of the valve plate 4 is provided with a reinforcing rib with a triangular section, the inclined plane bulge 28 faces the air outlet direction, the length of the inclined plane bulge 28 is 1/4-1/3 of the height of the valve plate 4, the inclined plane bulge 28 is arranged at the approximate middle position of the height direction of the valve plate 4, the acute angle included angle between the inclined plane of the inclined plane bulge 28 and the plane of the back surface of the valve plate 4 is 15-20 degrees, and the. When the temperature of the smoke in the public smoke channel reaches the set warning temperature, the soldering tin between the bimetallic strips 8 is melted, one of the bimetallic strips falls off from the other bimetallic strip, the locking pressing disc 11 is separated from the constraint of the bimetallic strips 8 and slides along the supporting shaft 7 under the action of the pressing disc pressing spring 9, at the moment, the clamping hook 15 on the valve plate pressing strip 14 is separated from the sinking groove 17 of the locking pressing disc 11, the locking pressing disc 11 presses the two valve plate pressing strips 14 and enables the two valve plate pressing strips 14 to be outwards opened and pressed on the two valve plates 4, wedge-shaped locking is formed between the valve plate pressing strips 14 and the locking pressing disc 11 with the conical cavity 12, the valve plates 4 are always in a closed state, meanwhile, the inclined planes 29 at the end parts of the two valve plate pressing strips 14 abut against the inclined planes.

In the foregoing embodiment, the flue check fire damper has an air outlet end face adapted to the flue gas channel, two air outlets are disposed on the end face, and a rotatable valve plate corresponding to the air outlets and capable of being opened only in the air outlet direction is disposed on the end face. The high-temperature closing device for forcibly closing the valve plate is of a double-leg structure shown in fig. 7, and in practical application, the flue check fire-proof valve structure has diversity, such as: the valve plate is arranged in a smoke channel of the fire damper, the smoke channel can also be a diameter-variable channel, the valve plates can be two or one, the opening direction of the valve plates can be divided into two, side, upper and lower, and the like, in order to adapt to the forced closing of the valve plates of the flue non-return fire damper with different structures, the high-temperature closing device for forcibly closing the valve plates can also adopt a single-leg structure, namely, a left leg or a right leg of a bracket 6 in the figure 7 is removed, only one leg is reserved, the high-temperature closing device is convenient to be installed at the corresponding part of the flue non-return fire damper, and for example, the support legs which are folded outwards at the end parts of the support legs are installed on the end face of an air outlet end, or installed on a mounting plate of the flue non-. The high-temperature closing device for forcibly closing the valve plate can be that a support shaft 7 is arranged on a support 6, a lock pressing plate 11 is sleeved on the support shaft 7, a pressing plate pressure spring 9 is sleeved on the support shaft 7 between the lock pressing plate 11 and the support 6, a bimetallic strip 8 which extends to the lock pressing plate 11 and can be melted or separated at a set temperature is arranged on the support 6, a clamping claw 16 which extends to the bimetallic strip 8 and is clamped on the bimetallic strip 8 is arranged on the lock pressing plate 11, a clamping hole corresponding to the clamping claw 16 is arranged on the bimetallic strip 8, when the temperature of smoke in a common smoke channel reaches a set warning temperature, soldering tin between the bimetallic strips is melted, one of the bimetallic strips falls off from the other bimetallic strip, the lock pressing plate 11 is separated from the constraint of the bimetallic strip, slides along the support shaft 7 under the action of the pressing plate pressure spring 9, the lock pressing plate 11 is pressed on the; at the moment, the locking plate 11 can be adapted to the flue non-return fire-proof valve with single valve plate or double valve plates as long as the outer diameter of the locking plate is adapted to the valve plates 4; the bracket can be of a single-leg structure or a double-leg structure. The valve plate pressing strips 14 corresponding to the locking and pressing discs 7 are hinged to one end, close to the valve plates 4, of the supporting shaft 7, so that the structure is further optimized, the valve plate pressing strips 14 can be two branches symmetrically arranged along the supporting shaft 7 and correspond to the fire-proof valves for forcibly closing the two valve plates, and the valve plate pressing strips can also be one branch of fire-proof valves for forcibly closing the single valve plate. One end of the locking pressure plate 11, which faces the pressure plate pressure spring 9, is provided with a sunken groove 17, the valve plate trim strip 14 is provided with a clamping hook 15 which is clamped in the sunken groove 17, after the locking pressure plate 11 is separated from the bimetallic strip 8 and pressed to the valve plate trim strip 14, the valve plate trim strip 14 is outwards opened and pressed on the valve plate 4, and the valve plate 4 is always in a closed state because wedge-shaped locking is formed between the valve plate trim strip 14 and the locking pressure plate 11 with the conical cavity 12.

Referring to fig. 11-13, an air outlet 5 is disposed on the end surface 3, a rotatable valve plate 4 that can only be opened in the air outlet direction is correspondingly disposed on the air outlet 5, and the end surface of the air outlet end and the upper end of the valve plate 4 are inclined toward the air inlet 2. As shown in fig. 11, the left side of the valve plate 4 is hinged to the end surface 3 through the valve seat 23, and at this time, the high-temperature closing device adopts a single-leg structure, and the legs of the high-temperature closing device are also installed on the end surface 3 on the left side of the air outlet 5; of course, the right side of the valve plate 4 may be hinged to the end surface 3 through the valve seat 23, and at this time, the support leg of the high temperature closing device is also installed on the end surface 3 on the right side of the air outlet 5. As shown in fig. 12, the upper side of the valve plate 4 is hinged to the end surface 3 through the valve seat 23, and at this time, the high-temperature closing device adopts a single-leg structure, and the legs thereof are also installed on the end surface 3 on the upper side of the air outlet 5; of course, it is also possible that the underside of the valve plate 4 is hinged to the end face 3 via the valve seat 23, in which case the legs of the high-temperature shut-off device are also mounted on the end face 3 on the underside of the air outlet 5. As shown in fig. 13, the upper valve plate of the air outlet 5 is divided into two large and small parts, wherein a smaller part of the valve plate is fixed on the upper part of the air outlet 5, and a larger part of the valve plate is hinged on the smaller part of the valve plate through a valve seat 23, i.e. the valve plate 4 is of an upward opening type, at this time, the high-temperature closing device adopts a single-leg structure, and the support leg thereof is also installed on the end surface 3 on the upper side of the air outlet 5; certainly, the valve plate 4 can also be left-open or right-open, and at this time, the support legs of the high-temperature closing device are also installed on the end surface 3 on the left side or the right side of the air outlet 5. Besides the structure, the structural form of the valve plate can also be a disc-shaped structure.

Referring to fig. 14, the flue duct check fire damper with another structure includes a cylindrical air inlet channel 1 formed by a housing, the air inlet channel may be a diameter-variable channel, the air inlet channel has an air inlet 2 and an air outlet (i.e. an air inlet channel and an air outlet channel) opposite to each other, and a mounting plate 26 is disposed on an outer wall of the housing, and for convenience of installation and fixation, the mounting plate 26 is generally square. A flue locking member 21 is provided on the mounting plate 26 to secure it to the flue to facilitate mounting and securing of the flue damper to the common flue. The inner side of the mounting disc 26 is provided with a guide cover 20 with consistent flue airflow direction, the cross section of the guide cover 20 is approximately U-shaped, the left side and the right side of the guide cover 20 are provided with hook grooves for mounting flue locking pieces 21, the mounting disc 26 is provided with locking bolt penetrating holes, and the locking bolt penetrating holes are arranged corresponding to the hook grooves. The oil smoke exhaust ventilator is characterized in that valve plates 4 are arranged in the air inlet channel, the valve plates 4 are two oppositely arranged, the two valve plates 4 are generally symmetrically arranged along the longitudinal central line of the valve plates, the valve plates 4 have two working positions for closing and opening, a blocking body which enables the two valve plates to be opened only in the direction of the air outlet is arranged at one end, close to the air inlet 2, in the air inlet channel, valve plate rotating shafts 33 are respectively arranged at two longitudinal ends of the two valve plates 4, valve seats 23 are correspondingly arranged in the air inlet channel, the valve seats 23 can be fixed on the inner wall of the oil smoke channel and can also be fixed on the blocking body, valve plate opening limiting devices are arranged on the valve seats 23 in the direction of. The blocking body can be an annular body arranged on the inner wall of the air inlet channel, and the blocking body can also be a boss arranged on the inner wall of the oil smoke channel or salient points arranged at annular intervals along the inner wall of the air inlet channel. The connecting strip 30 which is arranged in the air inlet channel and is close to the side of the air inlet 2 and divides the air inlet 2 into two parts is longitudinally arranged, the connecting strip 30 and the blocking body can be arranged integrally, namely, the two longitudinal ends of the connecting strip 30 are respectively connected to the inner edge of the blocking body, or the connecting strip 30 and the blocking body are respectively connected to the inner wall of the oil smoke channel, and the connecting strip 30 and the blocking body are tightly attached together. The valve block rotating shaft is close to the connecting strip 30, and the valve block rotating shaft is located on the inner side of the side face where the connecting strip 30 faces the air outlet side, so that the two valve blocks 4 can only be opened towards the air outlet direction, firstly, the blocking body is arranged to enable the two valve blocks to only be opened towards the air outlet direction, secondly, the periphery of the valve blocks is convenient to be attached and relatively kept sealed, the valve block rotating shaft is close to the connecting strip 30, the periphery of the valve blocks is convenient to be attached to the blocking body and relatively kept sealed, and meanwhile, each connecting part is compact in structure and flexible to open and close. The valve plate 4 can also be arranged on the air inlet 2.

Fig. 15 shows a flue system with a flue check fire damper, which includes a common flue 31, a flue check fire damper installation port 32 is opened at a predetermined position of the common flue, the flue check fire damper installation port 32 is generally opened on a surface wall of the common flue close to one side of the range hood, the flue check fire damper installation port 32 is internally installed with the flue check fire damper, an installation plate 26 of the flue check fire damper is attached to the surface wall of the common flue, an air outlet of the flue check fire damper is located in the common flue, and an air inlet of the flue check fire damper is located outside the common flue. The flue check fire damper can be installed and fixed in the flue check fire damper installation opening 32 through the flue locking piece in the above embodiments, and can also be installed and fixed in the flue check fire damper installation opening 32 through any known manner.

The concrete structure of the above-mentioned embodiment is for the purpose of illustration the utility model discloses, rather than right the utility model discloses a restriction, all are in the utility model discloses the improvement on the basis all should fall into the protection scope of the utility model.

Claims (20)

1. A flue non-return fire damper comprises a mounting disc (26) with a through hole, and is characterized in that an air inlet channel (1) is arranged on the front surface of the mounting disc (26), an air outlet is arranged in the air inlet channel (1), a valve seat (23) is arranged in the air inlet channel (1) or on the mounting disc (26), and a rotatable valve plate (4) which can only be opened towards the air outlet direction is hinged on the valve seat (23); and a high-temperature closing device which can forcibly close the valve plate (4) to the air inlet side at a set temperature and is provided with a locking mechanism is arranged in the air inlet channel (1) or on the mounting disc (26) through a bracket (6), so that the valve plate (4) is always in a closed state.

2. A flue non-return fire damper comprises a mounting disc (26) with a through hole, and is characterized in that an air inlet channel (1) is arranged on the front surface of the mounting disc (26), an air outlet end face (3) is correspondingly arranged on the back surface of the mounting disc (26), an air outlet (5) is arranged on the air outlet end face (3), a valve seat (23) is arranged on the air outlet end face (3) or the mounting disc (26), and a rotatable valve plate (4) which can only be opened towards the air outlet direction is hinged on the valve seat (23); and the air outlet end face (3) or the mounting disc (26) is provided with a high-temperature closing device which can forcibly close the valve plate (4) to the air inlet side at a set temperature and is provided with a locking mechanism through a support (6), so that the valve plate (4) is always in a closed state.

3. The flue duct non-return fire prevention valve as claimed in claim 2, wherein the valve seats (23) are arranged at the left and right middle positions of the outer end face of the air outlet end face (3) or the back face of the mounting plate (26), the two valve seats (23) are arranged at intervals up and down, and the valve plate (4) is hinged with the valve seats (23) through a pin shaft or a hinge shaft.

4. A flue non-return fire damper comprises a mounting disc (26) with a through hole, and is characterized in that an air inlet channel (1) is arranged on the front surface of the mounting disc (26), an air outlet is arranged in the air inlet channel (1), and a rotatable valve plate (4) which can only be opened towards the air outlet direction is arranged in the air inlet channel (1) or on the mounting disc (26); the air inlet channel is characterized in that a high-temperature closing device which can enable the valve plate (4) to be forcibly closed to the air inlet side and is provided with a locking mechanism is arranged in the air inlet channel (1) or on the mounting disc (26) through a support (6), so that the valve plate (4) is always in a closed state, a spring (27) corresponding to the valve plate (4) is arranged on the support (6), and the spring (27) is located on the back side of the valve plate (4).

5. A flue non-return fire damper comprises a mounting disc (26) with a through hole, and is characterized in that an air inlet channel (1) is arranged on the front surface of the mounting disc (26), an air outlet end face (3) is correspondingly arranged on the back surface of the mounting disc (26), an air outlet (5) is arranged on the air outlet end face (3), and a rotatable valve plate (4) which can only be opened towards the air outlet direction is arranged on the air outlet end face (3) or the mounting disc (26); the air outlet end face (3) or the mounting disc (26) is provided with a high-temperature closing device which can enable the valve plate (4) to be forcibly closed towards the air inlet side and is provided with a locking mechanism at a set temperature through a support (6), so that the valve plate (4) is always in a closed state, the support (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).

6. A flue non-return fire-proof valve according to claim 5, characterized in that the spring (27) is two symmetrically arranged branches, the two springs (27) are fixed on the bracket (6) through screws or rivets, and the two springs (27) have resilience to close the valve plate (4).

7. The flue duct non-return fire-proof valve as claimed in any one of claims 1 to 6, characterized in that the back of the mounting plate (26) is provided with a diversion cover (20), the back of the mounting plate (26) in the left and right cover walls of the diversion cover (20) is symmetrically provided with fire-proof valve locking pieces (21), and the left and right cover walls of the diversion cover (20) are provided with hook grooves (22) for extending the fire-proof valve locking pieces (21).

8. The flue duct non-return fire prevention valve as claimed in claim 7, wherein the fire prevention valve locking member (21) comprises a limiting sleeve (24) fixedly installed on the back surface of the installation disc (26), a bolt (10) penetrating from the front surface of the installation disc (26) is arranged in the limiting sleeve (24), a hook member (16) is screwed at the inner end of the bolt (10), the hook member (16) extends outwards from a hook groove (22), and the hook member (16) is tightly clamped on the inner wall of the flue gas duct through the bolt (10).

9. The flue duct non-return fire-proof valve as claimed in claim 7, wherein the hook groove (22) is in the shape of a corner, and has a straight groove section horizontally arranged and a vertical groove section vertically upwards arranged along the inner end of the straight groove section, and the straight groove section and the vertical groove section of the hook groove (22) are smoothly transited.

10. The flue duct non-return fire-proof valve as claimed in claim 8, characterized in that the outer end of the hook member (16) is provided with a protruding hook head, and the protruding hook head faces the mounting plate (26).

11. The flue duct non-return fire-proof valve according to claim 7, characterized in that the high temperature closing device with the locking mechanism comprises a supporting shaft (7) installed on a support (6), a locking pressure plate (11) is sleeved on the supporting shaft (7), a pressure plate pressure spring (9) is sleeved on the supporting shaft (7), a hot melt plate or a separated bimetallic plate (8) which can be melted at a set temperature and extends to the locking pressure plate (11) is arranged at the position of the support (6), and the locking pressure plate (11) and the hot melt plate or the bimetallic plate (8) are interlocked.

12. The flue check fire valve according to claim 11, characterized in that a valve plate pressing strip (14) is hinged to one end of the supporting shaft (7) close to the valve plate (4), a locking pressing plate (11) is arranged corresponding to the valve plate pressing strip (14), a sinking groove (17) is arranged at one end of the locking pressing plate (11) facing the pressing plate pressing spring (9), a clamping hook (15) clamped in the sinking groove (17) is arranged on the valve plate pressing strip (14), the locking pressing plate (11) is separated from the bimetallic strip (8) and presses against the valve plate pressing strip (14), and a mechanism for locking the valve plate pressing strip (14) and the locking pressing plate (11) is arranged between the valve plate pressing strip (14).

13. The flue duct check fire valve as claimed in claim 12, wherein the mutually locking mechanism is that the valve plate pressing strip (14) is wedge-shaped at the hinged end after being opened, the locking plate (11) and the corresponding end of the valve plate pressing strip (14) are provided with tapered cavities (12), and the valve plate pressing strip (14) with the wedge-shaped hinged end and the valve plate pressing strip (14) with the tapered cavities (12) form a wedge-shaped lock.

14. The flue check fire valve as claimed in claim 12, wherein the back surface of the valve plate (4) is provided with an inclined plane protrusion (28), the inclined plane protrusion (28) is vertically arranged at a position approximately in the middle of the left and right directions of the valve plate (4), and the end of the valve plate pressing bar (14) is provided with an inclined plane (29) corresponding to the inclined plane protrusion (28).

15. The flue duct check fire valve as claimed in claim 7, wherein the number of the air outlets (5) is two, the two air outlets are symmetrically arranged on the end surface of the air outlet end, the opening of the air outlet (5) is sleeved with a sealing ring (25), and the end surface of the air outlet end and the upper ends of the two valve plates (4) are inclined towards the air inlet (2).

16. The flue duct non-return fire prevention valve according to claim 2, 3 or 5, characterized in that the end surface (3) is provided with an air outlet (5), the valve plate (4) is a piece, and one side of the valve plate (4) is hinged on the end surface (3).

17. The flue duct non-return fire prevention valve as claimed in claim 16, wherein the valve plate (4) is hinged on the end face (3) on the left side or the right side of the air outlet (5).

18. A flue duct non-return fire prevention valve according to claim 16, 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).

19. The flue duct non-return fire-proof valve as claimed in claim 2, 3 or 5, characterized in that the end face (3) is provided with an air outlet (5), the valve sheet on the air outlet (5) is divided into two parts, wherein a smaller part of the valve sheet is fixed on the air outlet (5), and a larger part of the valve sheet is hinged on the smaller part of the valve sheet.

20. A flue system, comprising:

the setting part of the public flue gas channel is provided with a flue check fire damper mounting opening;

the flue non-return fire-proof valve as described in any one of claims 1-19 is installed in the flue non-return fire-proof valve installation opening.

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