CN217355589U - Baffle valve - Google Patents

Abstract

The utility model discloses a flapper valve, include: at least three valve plate blades which are arranged at the flow passage in sequence along the width direction of the blades; and rotating shafts which are arranged corresponding to the valve plate blades and are used for being jointed with the power device, at least one of the valve plate blades at the middle position is connected to the corresponding rotating shaft through a corresponding connecting rod mechanism, when the corresponding rotating shaft is driven by the power device, the corresponding rotating shaft is switched between a position for closing the flow opening and a position for opening the flow opening, each connecting rod mechanism is also correspondingly provided with a fixing piece, the fixing piece can be immovably and non-rotatably held to a channel wall or a partition plate adjacent to the rotating shaft along the radial direction of the rotating shaft connected with the corresponding connecting rod mechanism, and at least one connecting rod of the connecting rod mechanisms is connected to the fixing piece. The utility model discloses a flapper valve has avoided traditional dead lever rigidity not enough and the switch of adjacent valve plate blade probably has the problem of interference through setting up mounting or connecting piece on corresponding near the passageway wall or the baffle of pivot.

Description

Baffle valve

Technical Field

The utility model relates to a heating furnace technical field especially relates to a flapper valve for heating furnace cigarette (wind) way.

Background

The heating furnace is widely applied to the industries of petroleum, chemical industry, electric power, metallurgy and the like, and the baffle valve in the smoke (air) channel of the heating furnace can adjust the oxygen content and the negative pressure in the hearth in a pipeline by adjusting the opening of the baffle, so that the normal combustion of a burner of the heating furnace is ensured.

With energy conservation and emission reduction becoming the focus of attention, the waste heat recovery of the heating furnace tends to be normalized. When waste heat recovery is carried out, the damper is required to completely close the smoke (air) duct of the heating furnace, zero leakage is achieved, and the heat exchange efficiency is improved. For large diameter pipes, it is also necessary to take into account the cost, weight, etc. of the individual vanes, and a zero leakage flapper valve with multiple vanes is often desired.

However, the existing zero-leakage butterfly valve adopts a single blade, so that the large-caliber pipeline is high in manufacturing cost and heavy in weight, and the problem of zero leakage cannot be solved by the traditional multi-blade baffle.

In view of the above-identified problems of the related art, there is a need to develop a flapper valve that solves, or at least alleviates, the above-identified problems.

SUMMERY OF THE UTILITY MODEL

In order to overcome the deficiencies in the background art, the utility model discloses a flapper valve, its aim at provides the multi-blade flapper valve of zero leakage to solve or alleviate above-mentioned problem.

According to the utility model discloses, a flapper valve is provided, include:

a housing defining a vapor phase medium flow passage;

the clapboard is arranged in the shell transversely to the gas-phase medium circulation channel, and a circulation port for the circulation of the gas-phase medium is arranged on the clapboard;

at least three valve plate blades are sequentially arranged at the flow opening along the width direction of the blades;

a rotary shaft provided in correspondence with the valve plate vanes, the rotary shaft being held on the housing through a channel wall of the housing for engagement with a power unit, and at least one of the valve plate vanes located at an intermediate position being connected to the corresponding rotary shaft through a corresponding link mechanism for switching between a position closing the flow port and a position opening the flow port when the corresponding rotary shaft thereof is driven by the power unit,

wherein each of the link mechanisms is further provided with a fixing member, which is immovably and non-rotatably held to a passage wall or a partition adjacent to a rotating shaft connected to the corresponding link mechanism in a radial direction of the rotating shaft, at least one link of the link mechanisms being connected to the fixing member.

Preferably one end of the fixing is floatingly held to the channel wall or partition.

Preferably, the fixing member is of an elongate shape, and at least one end of the fixing member is movably connected to a sleeve fixed to a wall of the passage or partition adjacent to the shaft in a length direction, so that the fixing member can elongate relative to the sleeve in the length direction of the fixing member after being thermally expanded.

Preferably, the fixing member and the sleeve have a gap therebetween in a radial direction of the rotation shaft.

Preferably, the flapper valve includes a connecting plate welded to the wall of the passage or partition adjacent the shaft, the connecting plate including a plate having a length parallel to the axial direction of the shaft, the interconnecting ends of the plate or the fixing member being provided with elongated holes having a length parallel to the axial direction of the shaft, the ends of the plate and the fixing member being detachably fastened by fasteners through the elongated holes.

Preferably, the fixed member has one end fixedly connected to a passage wall or partition adjacent the shaft and the other end floatingly connected to the shaft or cantilevered end.

Preferably, the at least one connecting rod is held to the fixing member floating and immovably in the radial direction of the rotation axis.

Preferably, a gap is provided between the at least one connecting rod and the fixing member.

Preferably, the linkage mechanism is a four-bar linkage mechanism, and the at least one link is a fixed bar in the four-bar linkage mechanism, and the fixed bar is non-rotatably connected to the fixing member.

Preferably, the fixing rod is an L-shaped rod or a triangular thin plate, a rotating shaft hole for passing through the rotating shaft and allowing the rotating shaft to rotate is formed in the L-shaped rod or the triangular thin plate, and a link in the four-bar linkage except the fixing rod is pivotally connected to the fixing rod

In conclusion, according to the utility model discloses a flapper valve, through setting up link mechanism's mounting or connecting piece on near the passageway wall or the baffle that correspond the pivot, avoided link mechanism's dead lever overlength among the traditional mode to lead to the problem that rigidity is not enough, also can solve the interference problem that mounting or connecting piece probably exist to the switch of adjacent valve plate blade well.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG. 1 is a perspective view of a flapper valve according to a first embodiment of the present invention;

FIG. 2 is a top view of the flapper valve shown in FIG. 1;

FIG. 3 is a cross-sectional view taken along section A-A in FIG. 2;

FIG. 4 is a perspective view of a fixed rod in the linkage mechanism of the flapper valve shown in FIG. 1;

FIG. 5 is a front view of the fixing lever shown in FIG. 4;

FIG. 6 is a perspective view of a flapper valve according to a second embodiment of the present invention;

FIG. 7 is a top view of the flapper valve shown in FIG. 6;

FIG. 8 is a cross-sectional view taken along section B-B in FIG. 6;

figure 9 is a perspective view of a flapper valve according to a third embodiment of the present invention;

FIG. 10 is a top view of the flapper valve shown in FIG. 9;

FIG. 11 is a cross-sectional view taken along section C-C in FIG. 10;

FIG. 12 is an enlarged view of circle D in FIG. 9;

FIG. 13 is a top plan view of the retainer of the flapper valve shown in FIG. 9;

FIG. 14 is a right side elevational view of the retainer of the flapper valve illustrated in FIG. 13;

FIG. 15 is a front view of the retainer of the flapper valve shown in FIG. 13;

FIG. 16 is a perspective view of the retainer of the flapper valve shown in FIG. 13;

FIG. 17 is a perspective view of a fixed rod in the linkage mechanism of the flapper valve shown in FIG. 9;

FIG. 18 is a front view of the fixation rod shown in FIG. 17;

figure 19 is a perspective view of a flapper valve according to a fourth embodiment of the present invention;

FIG. 20 is a top plan view of the flapper valve shown in FIG. 19;

FIG. 21 is a cross-sectional view taken along section E-E in FIG. 10;

FIG. 22 is an enlarged view of circle F in FIG. 20;

FIG. 23 is a perspective view of the retainer of the flapper valve shown in FIG. 19;

FIG. 24 is a front elevational view of the retainer of the flapper valve illustrated in FIG. 23;

figure 25 is a perspective view of a flapper valve according to a fifth embodiment of the present invention;

FIG. 26 is a top view of the flapper valve shown in FIG. 25;

FIG. 27 is a sectional view taken along section G-G in FIG. 26;

FIG. 28 is a sectional view taken along section H-H in FIG. 26;

FIG. 29 is an enlarged view of circle I in FIG. 28;

FIG. 30 is a perspective view of the retainer of the flapper valve shown in FIG. 25;

FIG. 31 is a front view of the retainer of the flapper valve shown in FIG. 30.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not to be construed as limiting the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

In the present invention, the terms "upper", "lower", "axial direction of rotation shaft", "radial direction of rotation shaft", "longitudinal direction", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments, and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

First, a specific structure and details according to a first embodiment of the present invention will be described with reference to fig. 1 to 5.

Fig. 1 is a perspective view of a flapper valve according to a first embodiment of the present invention, fig. 2 is a top view of the flapper valve shown in fig. 1, and fig. 3 is a cross-sectional view taken along section a-a in fig. 2. In the figures, a flapper valve is generally indicated by reference numeral 10, the flapper valve 10 comprising a housing 11 defining a gas-phase medium flow channel 18; the partition plate 12 is arranged in the shell 11 transversely to the gas-phase medium circulation channel 18, and a circulation port 19 for the circulation of the gas-phase medium is arranged on the partition plate 12; four valve plate vanes 13 sequentially arranged at the flow port 18 in the width direction of the vanes 13; a rotary shaft 14 is provided in correspondence with the valve plate vanes 13, the rotary shaft 14 is held on the housing 11 through a passage wall of the housing 11 for engagement with the power unit 15, and each valve plate vane 13 located at the intermediate position is connected to the corresponding rotary shaft 14 by a corresponding link mechanism 17. When the rotary shaft 14 is driven by the power unit 15, the corresponding valve plate vane 13 is switched between a position closing the communication port 19 and a position opening the communication port 19.

With particular reference to fig. 3, the four shutter blades 13 are shown in a position closing the through-flow opening 19, in which the shutter blades 13 completely cover the through-flow opening 19. Since each valve plate blade 13 is connected to the rotary shaft 14 by the link mechanism 17, when switching from the position closing the communication port 19 to the position opening the communication port 19, the valve plate blade 13 can be translated upward from the direction shown in the drawing by the link mechanism 17 away from the communication port 19 and then rotated to the vertical position by a large angle, thereby opening the communication port 19. It can be seen from this that, according to the utility model discloses a valve plate blade 13 of flapper valve 10 can be connected with pivot 14 through link mechanism 17, realizes the flapper valve structure of the zero leakage of a plurality of valve plate blades, because every valve plate blade 13 has less size and weight, can also reduce the cost of valve plate blade.

To open and close the flow opening 19 of the valve plate vane 13, a fixing member is provided for each link mechanism 17. For the valve plate vanes 13 on both sides shown in fig. 1 to 3, the fixing members 16 'may be simply fixed to the adjacent side walls of the housing 11, but if the fixing members of the link mechanism 17 of the valve plate vane 13 in the middle position are fixed to the same side walls of the housing 11 as the fixing members 16' of the valve plate vanes 13 on both sides, there is a possibility that the valve plate vanes 13 on both sides and/or the valve plate vane 13 in the middle position shown in the drawings cannot be rotated from the position closing the communication port 19 to the position opening the communication port 19, and the rigidity of the fixing members of the valve plate vane 13 in the middle position is weakened, resulting in problems that the link mechanism of the flapper valve is unstable, easily deformed and damaged, and the like.

In order to avoid the above-mentioned problems with the fixing of the valve plate vane 13 in the intermediate position, the fixing 16 of the valve plate vane 13 in the intermediate position of the flapper valve 10 of the present invention is arranged to be held immovably and non-rotatably to the channel wall or partition 12 adjacent to the rotary shaft 14 in the radial direction of the rotary shaft 14 connected to the corresponding link mechanism 17, while at least one link of the link mechanism 17 is connected to the fixing 16.

In particular, in this embodiment, the fixing member 16 is an elongated round rod fixed to the wall of the passage of the housing 11 in parallel with the rotation axis 14. The ends of the retainer 16 may be secured to the channel walls of the housing 11, such as by welding, in a manner that may cause deformation of the housing 11 when the retainer 16 expands due to heat, given that the flapper valve 10 typically operates at high temperatures. Therefore, preferably, at least one end of the fixing member 16 is floatingly held to the channel wall adjacent to the rotating shaft 14, for example, a sleeve 161 fixed to the channel wall adjacent to the rotating shaft 14 of the housing 11 by welding is held to the housing 11, and when the fixing member 16 is thermally expanded, the end portion of the fixing member 16 connected to the sleeve 161 can be freely elongated in the sleeve 161 in the length direction, that is, at least one end of the fixing member 16 is movably connected to the sleeve 161 fixed to the channel wall adjacent to the rotating shaft 14 in the length direction, so that after the fixing member 16 is thermally expanded, the end portion connected to the sleeve 161 can be elongated relative to the sleeve in the length direction of the fixing member 16.

In the present invention, the link mechanism 17 may include a plurality of links, preferably a four-bar linkage, one link of the four-bar linkage is the fixing rod 171, and the fixing rod 171 is non-rotatably connected to the fixing member 16.

FIG. 4 is a perspective view of a fixed rod 171 of the linkage 17 of the flapper valve 10 shown in FIG. 1, and FIG. 5 is a front view of the fixed rod 171 shown in FIG. 4. In this embodiment, the fixing rod 171 is a triangular thin plate, and the fixing rod 171 is provided with a rotating shaft hole 1711 for passing through the rotating shaft 14 and allowing the rotating shaft 14 to rotate, and a fixing member hole 1712 for passing through the fixing member 16. One of the other links in the four-link mechanism except the fixing lever 171 is pivotably connected to the fixing lever 171 through a link hole 1713. This structure of the fixing rod 171 makes it possible to hold to the channel wall of the housing 11 without moving and rotating in the radial direction of the rotating shaft 14, in which case there may be a gap between the fixing piece 16 and the sleeve 161 in the radial direction of the rotating shaft 14 to allow, when heated, the thermal expansion of the fixing piece 16 in the radial direction of the rotating shaft 14 to be relieved. Meanwhile, there may be a gap between the fixture hole 1712 and the fixture 16, ensuring that the fixing rod 171 is freely expanded in a radial direction of the rotation shaft 14. That is, there may be a gap between at least one link and the mount 16. Therefore, in the present specification, "the radial direction does not move" is relative to complete fixation, and "the radial direction does not move" includes a fixation mode in which the radial direction is in clearance fit.

At least one end of the fixing element 16 is sleeved with the sleeve 161, so as to ensure that the fixing element 16 can freely expand along the sleeve 161 in a high-temperature flue gas environment.

The number of the valve plate vanes 13 is not limited to four as shown in the present embodiment, and the link mechanism and the fixing member structure in the present embodiment may be employed as long as there is at least one intermediate valve plate vane 13.

Next, a specific structure and details according to a second embodiment of the present invention will be described with reference to fig. 6 to 8.

FIG. 6 is a perspective view of a flapper valve according to a second embodiment of the present invention; FIG. 7 is a top view of the flapper valve shown in FIG. 6; fig. 8 is a sectional view taken along the B-B section in fig. 6. In this second embodiment, components that are identical to those of the first embodiment are designated with identical reference numerals, and only the first digit on the left is incremented by 1 for the sake of distinction.

The flapper valve 20 of this second embodiment differs from the flapper valve 10 of the first embodiment only in that the fastener 26 is fixedly attached at one end to the passage wall adjacent the shaft 24, such as by welding, and at the other end is a cantilevered end 261. The cantilevered end 261 of the fastener 26 in this manner is also free to elongate lengthwise when expanded by heat.

In this embodiment, the end of the fixing member 26 fixed by welding can also be held to the passage wall adjacent to the rotating shaft 24 by using a sleeve 161 as in the first embodiment.

The specific structure and details of a flapper valve 30 of a third embodiment of the present invention will be described next with reference to fig. 9 to 18.

Fig. 9 is a perspective view of a flapper valve 30 according to a third embodiment of the present invention, fig. 10 is a top view of the flapper valve 30 shown in fig. 9, and fig. 11 is a cross-sectional view taken along section C-C in fig. 10. In this third embodiment, components identical to those of the first embodiment are designated by the same reference numerals, and only the first digit on the left is incremented by 2 for the sake of distinction.

The flapper valve 30 of this third embodiment differs from the flapper valve 10 of the first embodiment only in that the retainer 36 is an elongated L-shaped thin plate, the flapper valve 30 includes a connecting plate 361 (see FIG. 12) welded to the channel wall adjacent the shaft 34, the retainer 36 (see FIGS. 13 to 16) is floatingly connected to the shaft 34 by an L-shaped fixing rod 371 (see FIGS. 17 and 18), and the specific structure and connection of the retainer 36 and the fixing rod 371 will be described in detail with reference to FIGS. 12 to 18.

FIG. 12 is an enlarged view taken from circle D in FIG. 9, FIG. 13 is a top view of the flapper valve retainer shown in FIG. 9, FIG. 14 is a right side view of the flapper valve retainer shown in FIG. 13, FIG. 15 is a front view of the flapper valve retainer shown in FIG. 13, and FIG. 16 is a perspective view of the flapper valve retainer shown in FIG. 13. The connecting plate 361 is shown to include a plate parallel to the axial direction of the rotating shaft 34, and the fixing member 36 is held to the channel wall adjacent to the rotating shaft 34 by the plate parallel to the axial direction of the rotating shaft 34. The connecting plate 361 is fixed to the wall of the passage of the housing 11 adjacent to the rotating shaft 34 by, for example, welding. An end portion of the longer leg of the fixing member 36 is provided with an elongated hole 362 having a long axis parallel to the axial direction of the rotating shaft 34, and the end portion of the fixing member 36 is detachably fastened to the connecting plate 361 via the elongated hole 362 by a fastener. The connecting plate 361 may also be provided with an elongated hole, in which case the end of the longer leg of the holder 36 may be provided with a circular hole, and this end of the holder 36 may be detachably fastened to the connecting plate 361 via the elongated hole in the connecting plate 361 by a fastener. Thus, after thermally expanded, the end portion of the mount 36 can be freely extended with respect to the connection plate 361 in the longitudinal direction of the mount (the axial direction of the rotation shaft 34).

FIG. 17 is a perspective view of a fixing rod 371 in the linkage 37 of the flapper valve 30 shown in FIG. 9, and FIG. 18 is a front view of the fixing rod 371 shown in FIG. 17. The fixing rod 371 is an L-shaped rod, a rotating shaft hole 3711 is formed in the L-shaped rod and is used for penetrating through the rotating shaft 34 and allowing the rotating shaft 34 to rotate, and a fixing piece hole 3712 is formed in the L-shaped rod and is used for being tightly connected with a fixing rod hole 363 in a shorter leg of the fixing piece 36 through a fastening piece. This structure of the fixing rod 371 allows it to be held to the channel wall of the housing 31 without moving and rotating in the radial direction of the rotating shaft 14, in which case the fixing piece hole 3712 or the fixing rod hole 363 may be provided as an elongated hole having a long axis direction in the radial direction of the rotating shaft 34, so that there is a gap between at least one connecting rod and the fixing piece 36 to allow the thermal expansion of the fixing piece 36 and the fixing rod 371 in the radial direction of the rotating shaft 34 to be relieved when heated. A link in the link mechanism other than the fixing lever 371 can be pivotably connected to the fixing lever 371 through the link hole 3713.

The L-shape of the fixing rod 371 shown in fig. 17 and 18 is also applicable to the fixing rod in other embodiments.

The fixing lever may also be implemented in an L-shape including legs in a direction parallel to the axial direction of the rotating shaft and in a direction parallel to the radial direction of the rotating shaft, respectively, in which case the fixing lever may also be connected to the fixing member through an elongated hole having a long axis parallel to the axial direction of the rotating shaft by providing the leg of the fixing lever parallel to the axial direction of the rotating shaft with the elongated hole, thereby alleviating the influence of thermal expansion of the valve plate blade or the fixing member in the axial direction of the rotating shaft.

The specific structure and details of a flapper valve 40 of a fourth embodiment of the present invention will be described next with reference to fig. 19 to 26.

Fig. 19 is a perspective view of a flapper valve 40 according to a fourth embodiment of the present invention, fig. 20 is a top view of the flapper valve 40 shown in fig. 19, and fig. 21 is a cross-sectional view taken along section E-E in fig. 20. In this fourth embodiment, components identical to those of the first embodiment are designated by the same reference numerals, and only the first digit on the left is incremented by 3 for the sake of distinction.

The flapper valve 40 of this fourth embodiment differs from the flapper valve 10 of the first embodiment in that the flapper valve 40 includes two fasteners 46, each fastener 46 having one end fixedly attached, such as by welding, to the diaphragm 42 adjacent the shaft 44 and the other end being a cantilevered end 461.

FIG. 22 is an enlarged view of circle F in FIG. 20, FIG. 23 is a perspective view of the retainer 46 of the flapper valve 40 shown in FIG. 19, and FIG. 24 is a front view of the retainer 46 of the flapper valve 40 shown in FIG. 23. As can be seen from fig. 22 to 24, two fixing pieces 46 are connected to the fixing rod 471 through the through hole 461 by fasteners, the two fixing pieces 46 are respectively located at two sides of the fixing rod 471, a gap d1 is provided between one fixing piece 46 and the fixing rod 471, so that the fixing rod 471 is held to the fixing piece 46 in a floating manner and immovably in the radial direction of the rotating shaft, and when the fixing rod 471 is expanded by heat, due to the arrangement of the gap d1, the fixing rod 471 can move freely in the axial direction of the rotating shaft 44 along with the thermal expansion of the valve plate blade 43, and the influence caused by the thermal expansion is relieved.

The through hole 461 of the fixing member 46 or a corresponding coupling hole (not shown) of the fixing rod 471 may be provided as an elongated hole having a long axis in the radial direction of the rotation shaft 44 to allow thermal expansion of the fixing rod 471 in the radial direction of the rotation shaft 44 to be relieved when heated.

Next, the specific structure and details of a flapper valve 50 of a fifth embodiment of the present invention will be described with reference to fig. 25 to 31.

Fig. 25 is a perspective view of a flapper valve 50 according to a fifth embodiment of the invention, fig. 26 is a top view of the flapper valve 50 shown in fig. 25, fig. 27 is a cross-sectional view taken along section G-G in fig. 26, fig. 28 is a cross-sectional view taken along section H-H in fig. 26, fig. 29 is an enlarged view of circle I in fig. 28, fig. 30 is a perspective view of the fixing member 56 of the flapper valve 50 shown in fig. 25, and fig. 31 is a front view of the fixing member of the flapper valve shown in fig. 30. In this fifth embodiment, the same components as in the fourth embodiment are designated by the same reference numerals, and only the first digit on the left is incremented by 1 for the sake of distinction.

The flapper valve 50 of this fifth embodiment differs from the flapper valve 40 of the fourth embodiment only in that one end of each of the two fasteners 56 includes a first perforation 561, for connection to the fixing rod 571 by a fastener, and the other end includes a second penetration hole 561', a connecting plate 562 for connecting to the partition plate 52 by a fastener, the connecting plate 562 of the partition plate 52 being fixed to the partition plate 52 by, for example, welding, two fixing pieces 56 being respectively provided on both sides of the fixing rod 571 and the connecting plate 562 of the partition plate 52, and one of the two fixing pieces 56 has a gap d2 with the connecting plate 562 of the partition plate 52, so that the fixing member 56 is held to the connecting plate 562 of the partition plate 52 floating and immovably in the radial direction of the rotation shaft 54, when thermally expanded, the fixing member 56 can freely move in the axial direction of the rotating shaft 54, and the influence of the thermal expansion of the valve plate vane 53 in the axial direction is relieved.

The first through-hole 561, the second through-hole 561' of the fixing member 56 or the corresponding connection holes (not shown) of the fixing rod 571 and the connection plate 562 may be provided as elongated holes having long axes in the radial direction of the rotation shaft 54 to allow the thermal expansion of the fixing rod 571 in the radial direction of the rotation shaft 54 to be relieved when heated.

In the third embodiment, the hole for passing the fastener in the connecting plate 361 parallel to the axial direction of the rotating shaft 34 is set as the elongated hole, or the hole for passing the fastener in the end of the longer leg of the fixing member 36 connected to the connecting plate 361 is set as the elongated hole 362, and in the fourth and fifth embodiments, by reserving the gap d1 between the fixing rod 471 and the fixing member 46 and the gap d2 between the fixing member 56 and the connecting plate 562 of the partition plate 52, it can be ensured that the fixing rod 371, 471, 571 can move freely in the axial direction of the rotating shaft 34, 44, 54 under the high temperature smoke environment, and the influence of the thermal expansion of the valve plate blades 33, 43, 53 is alleviated.

The structure of the fixing rod 471 and the fixing member 46 in the fourth embodiment, which is provided with the gap d1, is also applicable to the connection manner between the short leg of the fixing member 36 and the fixing rod 371 in the third embodiment, and also can ensure that the fixing rod 371 can move freely along the axial direction of the rotating shaft 34 under the high-temperature smoke mitigation.

The utility model discloses well mounting, dead lever, mounting are connected to shape, the structure of the connecting plate of casing or baffle and the connected mode between them are not limited to this article of embodiment, can realize that the mounting can not move and keep neighbouring in the radial direction of the pivot of being connected with corresponding link mechanism the passageway wall or the baffle of pivot, more preferably, realize simultaneously that the mounting freely expands along pivot axial direction, corresponds any shape, the structure of link mechanism along pivot radial direction free expansion and the connected mode between them, all are in the principle and the scope of the utility model.

In the first through fifth embodiments of the present invention, the flapper valves 10, 20, 30, 40 and 50 are shown as having a rectangular cross-section of the housing 11, 21, 31, 41 and 51, but the cross-sectional shape of the flapper valve housing is not limited to the illustrated embodiment and a housing having a circular or other suitable cross-sectional shape is equally suitable.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (10)

1. A flapper valve, comprising:

a housing defining a gas-phase medium flow passage;

the partition plate is arranged in the shell transversely to the gas-phase medium circulation channel, and a circulation port for the circulation of the gas-phase medium is formed in the partition plate;

at least three valve plate blades are sequentially arranged at the flow opening along the width direction of the blades;

a rotary shaft provided in correspondence with the valve plate vanes, the rotary shaft being held on the housing through a channel wall of the housing for engagement with a power unit, and at least one of the valve plate vanes located at an intermediate position being connected to the corresponding rotary shaft through a corresponding link mechanism for switching between a position closing the flow port and a position opening the flow port when the corresponding rotary shaft thereof is driven by the power unit,

wherein each of the link mechanisms is further provided with a fixing member, which is immovably and non-rotatably held to a passage wall or a partition adjacent to a rotating shaft connected to the corresponding link mechanism in a radial direction of the rotating shaft, at least one link of the link mechanisms being connected to the fixing member.

2. The flapper valve of claim 1 wherein one end of the retainer is floatingly retained to the channel wall or bulkhead.

3. The flapper valve of claim 2 wherein the retainer is elongated and at least one end of the retainer is movably connected lengthwise to a sleeve secured to the passage wall or the bulkhead adjacent the shaft so that the retainer expands when heated and elongates lengthwise of the retainer relative to the sleeve.

4. The flapper valve of claim 3 wherein the retainer and the sleeve have a gap therebetween in a radial direction along the axis of rotation.

5. The flapper valve of claim 2 including a connecting plate welded to the wall of the passage or partition adjacent the shaft, said connecting plate comprising a plate parallel to the axial direction of the shaft, said plate or retainer having an elongated hole with its long axis parallel to the axial direction of the shaft at the end of attachment to each other, said attachment ends of said plate and retainer being releasably and securely attached by a fastener through said elongated hole.

6. The flapper valve of claim 1 wherein the retainer is fixedly attached at one end to the passage wall or bulkhead adjacent the shaft and floatingly attached at the other end to the shaft or is a cantilevered end.

7. The flapper valve of any of claims 1-6, wherein the at least one link is floatingly and non-movably retained to the fixture in a radial direction of the axis of rotation.

8. The flapper valve of claim 7 wherein a gap is provided between the at least one link and the retainer.

9. The flapper valve of claim 7 wherein the linkage is a four-bar linkage and the at least one link is a fixed bar in the four-bar linkage, the fixed bar being non-rotatably connected to the fixture.

10. The flapper valve of claim 9 wherein the fixing rod is an L-shaped rod or a triangular thin plate provided with a rotation shaft hole for passing through the rotation shaft and allowing the rotation shaft to rotate, and a link other than the fixing rod of the four-bar linkage is pivotably connected to the fixing rod.

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