Air cap, air cap structure and flue system

Abstract

The utility model relates to an air cap, an air cap structure and a flue system so as to further optimize the structure of the air cap. The air cap is installed on the top of a flue of a building and comprises a base, a top cover and an annular fan unit, a first cavity is formed in the annular fan unit, the annular fan unit is located between the top cover and the base, the annular fan unit can rotate relative to the base, and the air cap is characterized in that an installation channel is formed in the top cover, and the first cavity is communicated with the installation channel. The base comprises a mounting ring, a supporting seat extending outwards is arranged at the bottom of the mounting ring, a second cavity used for communicating a flue with the annular fan unit is formed in the mounting ring, an air guide inlet and an air guide outlet are formed in the second cavity, and the second cavity communicates with the first cavity through the air guide outlet; and the base is arranged on the mounting ring, a mounting hole is formed in the base, and the projection of the mounting hole on the horizontal plane is located in the mounting channel.

Description

TECHNICAL FIELD

[0001] The utility model relates to a hood, hood structure and flue system. BACKGROUND

[0002] The utility model discloses a hood and exhaust system, wherein the hood comprises a base, a top cover and an annular fan unit, the annular fan unit is located between the top cover and the base, the annular fan unit is rotatable relative to the base, the annular fan unit comprises at least two blades, and there is an exhaust passage between adjacent blades, the exhaust passage has a smoke inlet and a smoke outlet located outside the smoke inlet.

[0003] However, the existing hood scheme has defects, including but not limited to: stability of base support, fluency of annular fan unit rotation, disassembly and assembly convenience of hood, medium discharge effect of hood. UTILITY MODEL CONTENT

[0004] The problem to be solved by the utility model is to provide a hood, a hood structure and a flue system to further optimize the structure of the hood.

[0005] To solve the above problems, the utility model provides the following technical scheme:

[0006] The hood is installed at the top of a flue of a building and comprises a base, a top cover and an annular fan unit, a first cavity is arranged on the annular fan unit, the annular fan unit is located between the top cover and the base, and the annular fan unit is rotatable relative to the base, characterized in that an installation channel is arranged on the top cover, and the base comprises:

[0007] A mounting ring is provided with a support seat extending outward at the bottom, a second cavity for connecting the flue and the annular fan unit is arranged on the mounting ring, a wind guide inlet and a wind guide outlet are arranged on the second cavity, and the second cavity is connected to the first cavity through the wind guide outlet;

[0008] A base is arranged on the mounting ring, and a mounting hole is arranged on the base, the projection of the mounting hole on a horizontal plane is located in the installation channel;

[0009] The hood further comprises a central shaft, the upper end of the central shaft is arranged in the installation channel, the lower end of the central shaft is arranged in the mounting hole, and the annular fan unit is arranged at the position of the central shaft between the top cover and the base.

[0010] In the prior art, the hood only comprises a mounting ring of the base, and the wall thickness of the mounting ring is usually thin to ensure the reliability of the hood, and this structure weakens the stability of the base.

[0011] The utility model discloses, the base is used for increasing the stability of the mounting ring, and the stability of the base is increased through increasing the stability of the mounting ring.

[0012] The utility model discloses, the mounting hole is used for installing the center shaft, the center shaft can be used for connecting fastener, and the center shaft can also be used for connecting driver, so the center shaft can be adapted to the unpowered hood, and also can be adapted to the power hood, and the applicable scene of the hood is increased.

[0013] In addition, the utility model discloses, the top cover is equipped with the installation channel, and the upper end of the center shaft is equipped in the installation channel, and the lower end of the center shaft is equipped in the mounting hole, wherein, the installation channel and the mounting hole are not only used for increasing the stability of the center shaft on the hood, but also limit the installation position of the center shaft on the hood, so the dismounting speed of the base, the top cover and the center shaft can be improved to a certain extent.

[0014] The utility model discloses, the projection of the mounting hole on the horizontal plane is located in the installation channel, when the projection of the mounting hole on the horizontal plane is located in the installation channel, the cross section area of installation channel on the horizontal plane is equal to or greater than the cross section area of mounting hole, so the installation space of the center shaft on the top cover will not be smaller than the installation space of the center shaft on the base, and the installation space of the center shaft on the top cover is increased to facilitate the convenience of dismounting the top cover.

[0015] Further, the cross section area of the second cavity at the air inlet is greater than the cross section area of the second cavity at the air outlet.

[0016] At least part of the base is arranged on the wall of the second cavity, and when at least part of the base is arranged on the wall of the second cavity, the base divides the second cavity into at least two flow channels.

[0017] The cross section area of the flow channel on the horizontal plane at the air outlet side is less than the cross section area of the flow channel on the horizontal plane at the air inlet side, the cross section area of the flow channel on the horizontal plane at the air outlet side is less than the cross section area of the air outlet on the horizontal plane, and the cross section area of the flow channel on the horizontal plane at the air outlet side is less than the cross section area of the first cavity on the horizontal plane.

[0018] The utility model discloses a wind -directing channel is located at the one side of the air -outlet, and the cross section area of the horizontal plane is less than the cross section area of the horizontal plane of the wind -directing channel that is located at the air -inlet side, the cross section area of the horizontal plane of the wind -directing channel that is located at the air -outlet side is less than the cross section area of the horizontal plane of the air -outlet, the cross section area of the horizontal plane of the wind -directing channel that is located at the air -outlet side is less than the cross section area of the horizontal plane of the first cavity, the pressure of the wind -directing channel that is located at the air -outlet side is less than the pressure of the wind -directing channel that is located at the air -inlet side, the pressure of the wind -directing channel that is located at the air -outlet side is less than the pressure of the air -outlet, the pressure of the wind -directing channel that is located at the air -outlet side is less than the pressure of the first cavity, according to Bernoulli's principle, the wind -directing channel that is located at the air -outlet side or the air -outlet will form negative pressure, that is, medium (the medium includes but is not limited to oil fume, peculiar smell gas, water vapor) will form Venturi effect at the wind -directing channel that is located at the air -outlet side or the air -outlet.

[0019] Further, the annular fan unit comprises an upper fixed plate, a lower fixed plate and at least two blades, each blade is arranged on the upper fixed plate at the upper portion of the blade, and is arranged on the lower fixed plate at the lower portion of the blade, and a smoke exhaust passage is arranged between adjacent blades, a smoke inlet and a smoke outlet located outside the smoke inlet are arranged on the smoke exhaust passage, and the projection of the smoke inlet on the horizontal plane does not correspond to the projection of the smoke outlet on the horizontal plane.

[0020] The inner edges of the at least two blades enclose the first cavity, the cross section area of the first cavity on the vertical plane is greater than the cross section area of the smoke inlet on the vertical plane, and the cross section area of the smoke inlet on the vertical plane is less than the cross section area of the smoke outlet on the vertical plane.

[0021] In the utility model, when the cross section area of the first cavity on the vertical plane is greater than the cross section area of the smoke inlet on the vertical plane, and the cross section area of the smoke inlet on the vertical plane is less than the cross section area of the smoke outlet on the vertical plane, the pressure of the first cavity is greater than the pressure of the smoke inlet, and the pressure of the smoke outlet is greater than the pressure of the smoke inlet, according to Bernoulli's principle, negative pressure will be formed at the smoke inlet, that is, medium will form Venturi effect at the smoke inlet. In this way, the hood will enhance the discharge effect of the medium at the annular fan unit.

[0022] Further, the central shaft is rotatably connected with the top cover through a first bearing, and the central shaft is rotatably connected with the annular fan unit through a second bearing.

[0023] And / or, the upper portion of each blade is clamped on the upper fixed plate, and the lower portion of each blade is clamped on the lower fixed plate.

[0024] The utility model discloses, first bearing passes through increasing the contact area between the central shaft and the top cover to realize the reliability, the fluency of improving the top cover rotation process, the second bearing passes through increasing the contact area between the central shaft and annular fan unit to realize the reliability, the fluency of improving annular fan unit rotation process.

[0025] The utility model discloses, when each blade upper portion is connected in the upper fixed plate, and each blade lower portion is connected in the lower fixed plate, the dismounting speed of each blade can obtain the promotion, and the manufacturing cost of the bonnet will reduce.

[0026] Further, when the base is arranged on the mounting ring, at least part of the base is above the mounting ring;

[0027] And / or, the base and the annular fan unit are in clearance fit.

[0028] The utility model discloses, when at least part of the base is above the mounting ring, the base above the mounting ring is used for increasing the interval distance between the base and the annular fan unit to avoid the base to interfere with the normal work of the annular fan unit. Similarly, the base and the annular fan unit are in clearance fit, also used for avoiding the base to interfere with the normal work of the annular fan unit.

[0029] Further, the central shaft and the top cover are clamped with the first bearing, and the central shaft is provided with a supporting surface for supporting the first bearing;

[0030] Or, the central shaft is provided with a limiting surface for limiting the base, and the limiting surface and the base are clamped with a gasket;

[0031] Or, the central shaft is provided with a nut, and the central shaft abuts against the base through the nut;

[0032] Or, the lower fixed plate is provided with a water baffle ring extending upwards, and the lower fixed plate is inclined downward from inside to outside;

[0033] Or, the top cover is detachably arranged on the annular fan unit;

[0034] Or, the top cover is connected to the annular fan unit;

[0035] Or, the top cover is provided with a rotation stopping surface, and the central shaft is provided with a matching surface matched with the rotation stopping surface;

[0036] Or, the annular fan unit is provided with a rotation stopping surface, and the central shaft is provided with a matching surface matched with the rotation stopping surface;

[0037] Or, the base is provided with a rotation stopping surface, and the central shaft is provided with a matching surface matched with the rotation stopping surface;

[0038] Or, the top cover is provided with a first protrusion extending downward, the annular fan unit is provided with a second protrusion extending downward, and the top cover is detachably arranged on the annular fan unit, when the top cover is detachably arranged on the annular fan unit, the first protrusion is located outside the second protrusion, and the first protrusion is located below the second protrusion.

[0039] Further, the air cap further comprises a driver, the driver is fixedly connected with the base, the driver is provided with a driving shaft, the central shaft is directly or indirectly arranged on the driving shaft, and the central shaft is rotationally connected with the top cover through a first bearing.

[0040] The air cap structure comprises an air cap and a mounting base, the air cap is detachably arranged on the mounting base, the air cap is the air cap described in any one of the technical solutions, and the air cap is detachably arranged on the mounting base through the base.

[0041] The flue system comprises a flue and an air cap structure, the flue is made of concrete, the air cap structure is the air cap structure described in any one of the technical solutions, and the mounting base of the air cap structure is arranged on the flue through concrete.

[0042] The flue system comprises a flue and an air cap, the flue is made of metal, and the air cap is the air cap described in any one of the technical solutions, and the air cap is detachably arranged on the flue through the base. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 It is a perspective view of the air cap in the preferred embodiment of the utility model;

[0044] Figure 2 It is a front view of the air cap in the preferred embodiment of the utility model;

[0045] Figure 3 It is Figure 2 It is a sectional view at A-A;

[0046] Figure 4 It is Figure 3 It is an enlarged view of B;

[0047] Figure 5 It is Figure 3 It is an enlarged view of C;

[0048] Figure 6 It is Figure 3 It is an enlarged view of D;

[0049] Figure 7 It is a first perspective view of the annular fan unit and the central shaft in the preferred embodiment of the utility model;

[0050] Figure 8The second perspective view of the annular fan unit and the central shaft in the preferred embodiment of the utility model;

[0051] Figure 9 The bottom view of the upper fixed plate in the preferred embodiment of the utility model;

[0052] Figure 10 The first perspective view of part of the air cap in the preferred embodiment of the utility model;

[0053] Figure 11 The second perspective view of part of the air cap in the preferred embodiment of the utility model. DETAILED DESCRIPTION

[0054] The technical scheme of the preferred embodiments of the utility model will be explained and described in combination with the drawings of the embodiments of the utility model, but the following embodiments are only the preferred embodiments of the utility model, and not all.

[0055] Referring to Figure 1 , Figure 2 and Figure 3 , the air cap is installed on the top of the chimney of a building, comprising a base 3, a top cover 1 and an annular fan unit 2, the annular fan unit 2 is provided with a first cavity 20, the annular fan unit 2 is located between the top cover 1 and the base 3, and the annular fan unit 2 can rotate relative to the base 3.

[0056] However, in the prior art, there is a defect of insufficient connection strength between the annular fan unit 2 and the base 3, therefore, the utility model is improved in view of this defect, referring to Figure 3 , Figure 4 and Figure 6 , the top cover 1 is provided with a mounting channel 10, and the base 3 comprises:

[0057] a mounting ring 31, the bottom of the mounting ring 31 is provided with an outwardly extending support seat 311, the mounting ring 31 is provided with a second cavity 30 for connecting the chimney and the annular fan unit 2, the second cavity 30 is provided with a wind guide inlet 3221 and a wind guide outlet 312, and the second cavity 30 is communicated with the first cavity 20 through the wind guide outlet 312;

[0058] a base 32, the base 32 is arranged on the mounting ring 31, and the base 32 is provided with a mounting hole 3211, and the projection of the mounting hole 3211 on the horizontal plane is located in the mounting channel 10;

[0059] Among them, the air cap further comprises a central shaft 4, the upper end of the central shaft 4 is arranged in the mounting channel 10, the lower end of the central shaft 4 is arranged in the mounting hole 3211, and the annular fan unit 2 is arranged at the position of the central shaft 4 between the top cover 1 and the base 32.

[0060] In the prior art, the hood only comprises a mounting ring of the base, and the wall thickness of the mounting ring is usually thin to ensure the reliability of smoke exhaust of the hood, which weakens the stability of the base.

[0061] In the utility model, the hood comprises a base 3, and the base 3 comprises a mounting ring 31 and a base 32 arranged on the mounting ring 31; when the base 32 is arranged on the mounting ring 31, the base 32 is used for increasing the stability of the mounting ring 31. This structure increases the stability of the mounting ring 31 to realize the increase of the stability of the base 3.

[0062] In the utility model, the base 32 is provided with a mounting hole 3211, and the mounting hole 3211 is used for mounting a central shaft 4; the central shaft 4 can be used for connecting a fastening structure 8, and the central shaft 4 can also be used for connecting a driver (not marked). In this structure, the central shaft 4 can be adapted to a non-powered hood and also can be adapted to a powered hood to realize the increase of the applicable scene of the hood.

[0063] In addition, in the utility model, the top cover 1 is provided with a mounting channel 10, the upper end of the central shaft 4 is arranged in the mounting channel 10, and the lower end of the central shaft 4 is arranged in the mounting hole 3211; wherein the mounting channel 10 and the mounting hole 3211 are not only used for increasing the stability of the central shaft 4 on the hood, but also limit the mounting position of the central shaft 4 on the hood. In this structure, the dismounting speed of the base 3, the top cover 1 and the central shaft 4 can be improved to a certain extent.

[0064] In the utility model, the projection of the mounting hole 3211 on the horizontal plane is located in the mounting channel 10; when the projection of the mounting hole 3211 on the horizontal plane is located in the mounting channel 10, the cross-sectional area of the mounting channel 10 on the horizontal plane is greater than or equal to the cross-sectional area of the mounting hole 3211; because the cross-sectional area of the mounting channel 10 on the horizontal plane is greater than or equal to the cross-sectional area of the mounting hole 3211, the mounting space of the central shaft 4 on the top cover 1 will not be smaller than the mounting space of the central shaft 4 on the base 3. In this structure, the hood can realize the dismounting and maintenance of the annular fan unit 2 by dismounting the top cover 1.

[0065] In the utility model, the lower end of the central shaft 4 is fixedly connected with the base 3, and the upper end of the central shaft 4 is rotatably connected with the annular fan unit 2 through a second bearing 6. This structure raises the rotating position of the annular fan unit 2 on the hood to realize the increase of the stability of the annular fan unit 2 in the rotating process.

[0066] Referring to Figure 3 , Figure 10 and Figure 11 , the cross-sectional area of the second cavity 30 at the air guide inlet 3221 is greater than the cross-sectional area of the second cavity 30 at the air guide outlet 312.

[0067] At least part of the base 32 is arranged on the wall of the second cavity 30, and when at least part of the base 32 is arranged on the wall of the second cavity 30, the base 32 divides the second cavity 30 into at least two flow guide channels 301;

[0068] The cross-sectional area of the flow guide channel 301 on the horizontal plane on the side of the air guide outlet 312 is less than the cross-sectional area of the flow guide channel 301 on the horizontal plane on the side of the air guide inlet 3221, the cross-sectional area of the flow guide channel 301 on the horizontal plane on the side of the air guide outlet 312 is less than the cross-sectional area of the air guide outlet 312 on the horizontal plane, and the cross-sectional area of the flow guide channel 301 on the horizontal plane on the side of the air guide outlet 312 is less than the cross-sectional area of the first cavity 20 on the horizontal plane.

[0069] In the utility model, when the cross-sectional area of the flow guide channel 301 on the horizontal plane on the side of the air guide outlet 312 is less than the cross-sectional area of the flow guide channel 301 on the horizontal plane on the side of the air guide inlet 3221 and the cross-sectional area of the flow guide channel 301 on the horizontal plane on the side of the air guide outlet 312 is less than the cross-sectional area of the first cavity 20 on the horizontal plane, the pressure on the side of the flow guide channel 301 on the side of the air guide outlet 312 is less than the pressure on the side of the flow guide channel 301 on the side of the air guide inlet 3221, and the pressure on the side of the flow guide channel 301 on the side of the air guide outlet 312 is less than the pressure of the first cavity 20, according to Bernoulli's principle, a negative pressure will be formed on the side of the flow guide channel 301 on the side of the air guide outlet 312, that is, a Venturi effect will be formed on the side of the flow guide channel 301 on the side of the air guide outlet 312 or at the air guide outlet 312.

[0070] When the base 32 is located in the second cavity 30, the cross-sectional area of the flow guide channel 301 on the horizontal plane on the side of the air guide outlet 312 is less than the cross-sectional area of the air guide outlet 312 on the horizontal plane, and the pressure on the side of the flow guide channel 301 on the side of the air guide outlet 312 is less than the pressure of the air guide outlet 312, so that a negative pressure will be formed at the air guide outlet 312.

[0071] In combination Figure 3 And Figure 10 It can be seen that the base 32 comprises a central seat 321 and at least two partition plates 322, the inner side of each partition plate 322 is arranged on the central seat 321, the outer side of each partition plate 322 is arranged on the wall of the second cavity 30, and the central seat 321 divides the second cavity 30 into at least two flow guide channels 301 through the partition plates 322, specifically: the base 32 comprises four partition plates 322, that is, the central seat 321 divides the second cavity 30 into four flow guide channels 301 through the partition plates 322.

[0072] Preferably, the bottom of the partition plate 322 is flush with the bottom of the mounting ring 31, and this structure increases the anti-deformation ability of the bottom of the mounting ring 31.

[0073] Preferably, the inner side of each partition plate 322 is inwardly recessed, which structure is shown in the attached drawings. Figure 3 As can be seen, the structure is used to avoid interference between the fastening structure 8 and the mounting seat 100 after the fastening structure 8 is fixed to the central shaft 4.

[0074] Preferably, the axial length of the central seat 321 is ≥20mm; or, the axial length of the central seat 321 is ≥ the axial length of the mounting ring 31. This structure is used to increase the contact area between the central shaft 4 and the base 32, so as to improve the anti-deformation ability of the base 3.

[0075] Referring to Figure 3 , Figure 7 and Figure 9 , the annular fan unit 2 comprises an upper fixed plate 21, a lower fixed plate 23 and at least two blades 22, the upper part of each blade 22 is arranged on the upper fixed plate 21, the lower part of each blade 22 is arranged on the lower fixed plate 23, there is a smoke exhaust passage 10 between adjacent blades 22, the smoke exhaust passage 10 is provided with a smoke inlet 101 and a smoke outlet 102 located outside the smoke inlet 101, the projection of the smoke inlet 101 on the horizontal plane does not correspond to the projection of the smoke outlet 102 on the horizontal plane.

[0076] Among them, the inner edges of the at least two blades 22 form the first cavity 20, the cross-sectional area of the first cavity 20 on the vertical plane is > the cross-sectional area of the smoke inlet 101 on the vertical plane, and the cross-sectional area of the smoke inlet 101 on the vertical plane is < the cross-sectional area of the smoke outlet 102 on the vertical plane.

[0077] In the utility model, when the cross-sectional area of the first cavity 20 on the vertical plane is > the cross-sectional area of the smoke inlet 101 on the vertical plane, and the cross-sectional area of the smoke inlet 101 on the vertical plane is < the cross-sectional area of the smoke outlet 102 on the vertical plane, the pressure of the first cavity 20 is > the pressure of the smoke inlet 101, and the pressure of the smoke outlet 102 is > the pressure of the smoke inlet 101. According to Bernoulli's principle, negative pressure will be formed at the smoke inlet 101, that is, the Venturi effect will be formed at the smoke inlet 101.

[0078] As can be seen from Figure 9 , the length dimension of the smoke inlet 101 on the horizontal plane is L2, and the length dimension of the smoke outlet 102 on the horizontal plane is L3, and L3>L2.

[0079] When the flow guide passage 301 forms negative pressure at the air guide outlet 312, and negative pressure will be formed at the smoke inlet 101, the air cap will realize the secondary acceleration of the medium.

[0080] Preferably, the cross-sectional area of the air guide passage 301 at the air guide outlet 312 in the horizontal plane is greater than the cross-sectional area of the smoke inlet 101 in the vertical plane, and when the cross-sectional area of the air guide passage 301 at the air guide outlet 312 in the horizontal plane is greater than the cross-sectional area of the smoke inlet 101 in the vertical plane, the pressure of the air guide passage 301 at the air guide outlet 312 is greater than the pressure at the smoke inlet 101. This structure can make the medium adsorption force at the smoke inlet 101 greater than the medium adsorption force at the air guide passage 301 at the air guide outlet 312, that is, the medium forms a first acceleration at the air guide passage 301 at the air guide outlet 312, and then the medium forms a second acceleration at the smoke inlet 101.

[0081] Preferably, the cross-sectional area of the air guide passage 301 at the air guide outlet 312 in the horizontal plane is less than the cross-sectional area of the smoke inlet 101 in the vertical plane, and when the cross-sectional area of the air guide passage 301 at the air guide outlet 312 in the horizontal plane is less than the cross-sectional area of the smoke inlet 101 in the vertical plane, the pressure of the air guide passage 301 at the air guide outlet 312 is less than the pressure at the smoke inlet 101. This structure can increase the adsorption force of the smoke cap to the flue.

[0082] Referring to Figure 3 , Figure 4 and Figure 5 , the central shaft 4 is rotatably connected with the top cover 1 through the first bearing 5, and the central shaft 4 is rotatably connected with the annular fan unit 2 through the second bearing 6, specifically: the mounting channel 10 is a first mounting groove, and the groove depth of the first mounting groove is greater than the axial dimension of the first bearing 5; the upper fixed plate 21 is provided with a guide plate 213, the guide plate 213 is provided with a second mounting groove 214 and a first through hole 2131, the second mounting groove 214 comprises a groove side wall 2141 and a groove bottom wall 2142, the length dimension of the groove side wall 2141 is greater than the axial dimension of the second bearing 5, and the groove bottom wall 2142 is provided with a second through hole (not marked), the central shaft 4 penetrates the first through hole 2131 and the second through hole, and after the central shaft 4 penetrates the first through hole 2131 and the second through hole, the central shaft 4 is rotatably connected with the second mounting groove 214 through the second bearing 6.

[0083] In the utility model, since the groove depth of the first mounting groove is greater than the axial dimension of the first bearing 5, and the length dimension of the groove side wall 2141 is greater than the axial dimension of the second bearing 5, when the central shaft 4 is rotatably connected with the top cover 1 through the first bearing 5 and the central shaft 4 is rotatably connected with the annular fan unit 2 through the second bearing 6, the first bearing 5 is located in the mounting channel 10, and the second bearing 5 is located in the second mounting groove 214; the first bearing 5 is located in the mounting channel 10 for increasing the contact area between the top cover 1 and the first bearing 5, and the second bearing 5 is located in the second mounting groove 214 for increasing the contact area between the upper fixed plate 21 and the second bearing 6, so that the stability of the annular fan unit 2 in the working process is improved.

[0084] Preferably, the mounting channel 10 is a stepped groove, and a stepped surface is arranged on the mounting channel 10, when the central shaft 4 is rotatably connected with the top cover 1 through the first bearing 5, and the central shaft 4 is rotatably connected with the annular fan unit 2 through the second bearing 6, the first bearing 5 is clamped between the stepped surface of the mounting channel 10 and the supporting surface 41, and the second bearing 6 is clamped between the limiting surface 42 and the groove bottom wall 2142. This structure further improves the stability of the annular fan unit 2 during operation.

[0085] Preferably, the guide plate 213 is inclined outward from the base 3 to the top cover 1, and this structure is used to change the direction of the guide plate 213 to the direction of the medium flow, so as to reduce the time of the medium staying in the first cavity 20.

[0086] Referring to Figure 3 , Figure 8 and Figure 10 , each blade 22 is clamped on the upper fixed plate 21, and each blade 22 is clamped on the lower fixed plate 23, specifically: the upper fixed plate 21 is provided with a first positioning groove 215 and a first positioning hole 212, the upper part of the blade 22 is inserted into the first positioning groove 215, and the upper part of the blade 22 is clamped and connected with the upper fixed plate 21 after penetrating through the first positioning hole 212; the lower fixed plate 23 is provided with a second positioning groove 232 and a second positioning hole 233, the lower part of the blade 22 is inserted into the second positioning groove 232, and the lower part of the blade 22 is clamped and connected with the lower fixed plate 23 after penetrating through the second positioning hole 233. When each blade 22 is clamped on the upper fixed plate 21, and each blade 22 is clamped on the lower fixed plate 23, the disassembly and assembly speed of each blade 22 can be improved, and the manufacturing cost of the air cap can be reduced. In other embodiments of the present application, the blade and the upper fixed plate are connected by screws, the blade and the lower fixed plate are connected by screws, or the blade and the upper fixed plate are connected by screws, the blade and the lower fixed plate are clamped, or the blade and the upper fixed plate are clamped, and the blade and the lower fixed plate are glued.

[0087] Referring to Figure 3 , when the base 32 is arranged on the mounting ring 31, at least part of the base 32 is located above the mounting ring 31, the base 3 is gap-fitted with the annular fan unit 2, and the base 32 is arranged on the mounting ring 31. Figure 10 It can be seen that the spacing distance between the mounting ring 31 and the lower fixed plate 23 is L1, and L1 is not equal to 0.

[0088] In the present application, when at least part of the base 32 is located above the mounting ring 31, the base 32 located above the mounting ring 31 is used to increase the spacing distance between the base 3 and the annular fan unit 2, so as to avoid the base 3 interfering with the normal operation of the annular fan unit 2. Similarly, the gap-fitted relationship between the base 3 and the annular fan unit 2 is also used to avoid the base 3 interfering with the normal operation of the annular fan unit 2.

[0089] In addition, when the base 32 is at least partially positioned above the mounting ring 31, the axial length of the central seat 321 is also increased. This structure further increases the contact area between the base 32 and the central shaft 4, so as to improve the reliability of the central shaft 4 during operation and reduce the probability of bending of the central shaft 4.

[0090] Referring to Figure 4 , Figure 7 and Figure 8 , the first bearing 5 is clamped between the central shaft 4 and the top cover 1, and the central shaft 4 is provided with a supporting surface 41 for supporting the first bearing 5. In this structure, the supporting surface 41 is used to define the mounting position of the first bearing 5 on the central shaft 4.

[0091] Referring to Figure 3 and Figure 5 , the central shaft 4 is provided with a limiting surface 42 for limiting the base 3, and the gasket 7 is clamped between the limiting surface 42 and the base 3. Preferably, when the gasket 7 is clamped between the limiting surface 42 and the base 3, the top wall of the gasket 7 abuts against the limiting surface 42, and the bottom wall of the gasket 7 abuts against the top wall 3212 of the base 3. In this structure, the gasket 7 is used to increase the service life of the central shaft 4.

[0092] Referring to Figure 3 , Figure 5 and Figure 6 , the central shaft 4 is provided with a fastening structure 8, and the central shaft 4 abuts against the base 3 through the fastening structure 8. Specifically, the fastening structure 8 includes a mounting nut 81, a locking nut 82, and a nut cover 83. After the central shaft 4 penetrates the mounting hole 3211, the gasket 7 is clamped between the central shaft 4 and the base 3, the mounting nut 81 is threadedly connected with the central shaft 4, the locking nut 82 is threadedly connected with the central shaft 4, and the nut cover 83 is sleeved on the outer side of the mounting nut 81 and the locking nut 82. When the gasket 7 is clamped between the central shaft 4 and the base 3, and the mounting nut 81 is threadedly connected with the central shaft 4, the gasket 7 abuts against the top wall of the central seat 321, and the mounting nut 81 abuts against the bottom wall of the central seat 321. This structure is used to increase the connection strength between the central shaft 4 and the base 3.

[0093] Referring to Figure 10 , the inner side of the lower fixed plate 23 is provided with a water blocking ring 312 extending upward, and the lower fixed plate 23 is inclined downward from the inside to the outside. This structure allows rainwater or external liquid to enter the first cavity 20 through the lower fixed plate 23.

[0094] Referring to Figure 3 and Figure 7 ​The top cover 3 is detachably arranged on the annular fan unit 2, and specifically, the top cover 3 is provided with a through hole 12, the upper fixed plate 21 is provided with a threaded hole 212, and the screw 9 is fixedly connected with the threaded hole 212 after penetrating through the through hole 12. This structure facilitates the maintenance of the annular fan unit 2. In other embodiments of the utility model, the top cover is threadedly connected with the annular fan unit, or the top cover is buckle-connected with the annular fan unit.

[0095] Referring to Figure 3 and Figure 7 The top cover 3 is detachably arranged on the annular fan unit 2, and specifically, the top cover 3 is provided with a through hole 12, the upper fixed plate 21 is provided with a threaded hole 212, and the screw 9 is fixedly connected with the threaded hole 212 after penetrating through the through hole 12. This structure facilitates the maintenance of the annular fan unit 2. In other embodiments of the utility model, the top cover is threadedly connected with the annular fan unit, or the top cover is buckle-connected with the annular fan unit.

[0096] In the utility model, the top cover 1 is provided with a rotation-stopping surface, and the central shaft 4 is provided with a matching surface matched with the rotation-stopping surface; this structure is used for preventing the central shaft 4 from rotating relative to the top cover 1. Or, the annular fan unit 2 is provided with a rotation-stopping surface, and the central shaft 4 is provided with a matching surface matched with the rotation-stopping surface; this structure is used for preventing the central shaft 4 from rotating relative to the annular fan unit 2; or, the base 3 is provided with a rotation-stopping surface, and the central shaft 4 is provided with a matching surface matched with the rotation-stopping surface; this structure is used for preventing the central shaft 4 from rotating relative to the base 3.

[0097] Referring to Figure 2 and Figure 3 The top cover 1 is detachably arranged on the annular fan unit 2, and specifically, the top cover 3 is provided with a through hole 12, the upper fixed plate 21 is provided with a threaded hole 212, and the screw 9 is fixedly connected with the threaded hole 212 after penetrating through the through hole 12. This structure facilitates the maintenance of the annular fan unit 2. In other embodiments of the utility model, the top cover is threadedly connected with the annular fan unit, or the top cover is buckle-connected with the annular fan unit.

[0098] In combination with Figure 3 and Figure 11 It is not difficult to find that the utility model provides two kinds of bases 3, one of which is provided with a supporting ring 33 on the upper portion of the mounting ring 31, and the other of which is not provided with a supporting ring 33 on the upper portion of the mounting ring 31. The two kinds of bases 3 enable the base to match annular fan units 2 of different models.

[0099] In the utility model, the air cap can also be a powered air cap, and the air cap further comprises a driver (not marked), which is fixedly connected with the base 3. The driver is provided with a driving shaft (not marked), the central shaft 4 is directly or indirectly arranged on the driving shaft, and the central shaft 4 is rotationally connected with the top cover 1 through the first bearing 5.

[0100] Referring to Figure 1, the hood structure comprises a hood and a mounting base 100, the hood is detachably arranged on the mounting base 100, the mounting base 100 is provided with a medium channel for connecting the chimney and the hood, the hood is the hood described in the embodiment, and the hood is detachably arranged on the mounting base 100 through the base 3.

[0101] In addition, the mounting base 100 has the advantages that when the hood is not arranged on the mounting base 100, the medium channel on the mounting base 100 is closed by the cover plate, so that rainwater and foreign matters cannot enter the chimney through the medium channel, and damage or water accumulation of the chimney is avoided, especially the chimney is prevented from emitting odor.

[0102] In the utility model, the hood is detachably arranged on the mounting base 100 through the base 3, when the mounting base 100 is arranged on the chimney, the mounting base 100 serves as a horizontal piece at the top of the chimney, so that the hood can be vertically arranged on the chimney.

[0103] Preferably, the mounting base 100 is made of metal; and the hood is made of metal.

[0104] Preferably, the base 3 is fixedly connected with the mounting base 100 through screws. In other embodiments of the utility model, the base is buckle-connected with the mounting base; or the base is threadedly connected with the mounting base; or the base is glued with the mounting base.

[0105] The chimney system comprises a chimney and a hood structure, the chimney is made of concrete, the hood structure is the hood structure described in the embodiment, and the mounting base of the hood structure is arranged on the chimney through concrete. In other embodiments of the utility model, the chimney system comprises a chimney and a hood, the chimney is made of metal, the hood is the hood described in the embodiment, and the hood is detachably arranged on the chimney through a base.

[0106] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, and those skilled in the art should understand that the utility model comprises but is not limited to the contents described in the drawings and the above specific embodiment. Any modification without deviating from the function and structural principle of the utility model shall be included in the scope of claims.

Claims

1. A fan cap, installed on the top of a building's flue, comprising a base, a top cover, and an annular fan unit, wherein the annular fan unit has a first cavity, the annular fan unit is located between the top cover and the base, and the annular fan unit is rotatable relative to the base, characterized in that, The top cover is provided with a mounting channel, and the base comprises: a mounting ring, a bottom of the mounting ring is provided with a support seat extending outward, the mounting ring is provided with a second cavity for connecting the flue and the annular fan unit, the second cavity is provided with an air guide inlet and an air guide outlet, and the second cavity is connected with the first cavity through the air guide outlet; a base, the base is provided on the mounting ring, and the base is provided with a mounting hole; wherein the air cap further comprises a central shaft, an upper end of the central shaft is provided in the mounting channel, and a lower end of the central shaft is provided in the mounting hole, and the annular fan unit is arranged at a position of the central shaft between the top cover and the base.

2. The hood of claim 1, wherein The cross-sectional area of the second cavity at the air guide inlet is greater than the cross-sectional area of the second cavity at the air guide outlet; At least part of the base is arranged on the wall of the second cavity, and when at least part of the base is arranged on the wall of the second cavity, the base divides the second cavity into at least two flow guide channels; wherein the cross-sectional area of the flow guide channel on the horizontal plane on the side of the air guide outlet is less than the cross-sectional area of the flow guide channel on the horizontal plane on the side of the air guide inlet, the cross-sectional area of the flow guide channel on the horizontal plane on the side of the air guide outlet is less than the cross-sectional area of the air guide outlet on the horizontal plane, and the cross-sectional area of the flow guide channel on the horizontal plane on the side of the air guide outlet is less than the cross-sectional area of the first cavity on the horizontal plane.

3. The hood of claim 2, wherein The annular fan unit comprises an upper fixed plate, a lower fixed plate and at least two blades, the upper part of each blade is arranged on the upper fixed plate, the lower part of each blade is arranged on the lower fixed plate, and there is a smoke exhaust channel between adjacent blades, the smoke exhaust channel is provided with a smoke inlet and a smoke outlet located on the outer side of the smoke inlet, and the projection of the smoke inlet on the horizontal plane does not correspond to the projection of the smoke outlet on the horizontal plane; wherein the inner edges of the at least two blades form the first cavity, the cross-sectional area of the first cavity on the vertical plane is greater than the cross-sectional area of the smoke inlet on the vertical plane, and the cross-sectional area of the smoke inlet on the vertical plane is less than the cross-sectional area of the smoke outlet on the vertical plane.

4. The hood of claim 3, wherein The central shaft is rotatably connected with the top cover through a first bearing, and the central shaft is rotatably connected with the annular fan unit through a second bearing; and / or, the upper part of each blade is clamped to the upper fixed plate, and the lower part of each blade is clamped to the lower fixed plate.

5. The hood of claim 1, wherein When the base is arranged on the mounting ring, at least part of the base is located above the mounting ring; and / or, the base and the annular fan unit are gap-fitted.

6. The hood of claim 3, wherein The first bearing is clamped between the central shaft and the top cover, and the central shaft is provided with a support surface for supporting the first bearing; or, the central shaft is provided with a limiting surface for limiting the base, and the limiting surface and the base are clamped with a gasket therebetween; or, the central shaft is provided with a fastening structure, and the central shaft abuts against the base through the fastening structure; or, the inner side of the lower fixed plate is provided with a water blocking ring extending upward, and the lower fixed plate is inclined downward from inside to outside; or, the top cover is detachably arranged on the annular fan unit; or, the top cover is clamped to the annular fan unit. Or, the top cover is provided with a rotation-stopping surface, and the central shaft is provided with a matching surface matched with the rotation-stopping surface; Or, the annular fan unit is provided with a rotation-stopping surface, and the central shaft is provided with a matching surface matched with the rotation-stopping surface; Or, the base is provided with a rotation-stopping surface, and the central shaft is provided with a matching surface matched with the rotation-stopping surface; Or, the top cover is provided with a first protrusion extending downward, the annular fan unit is provided with a second protrusion extending downward, and the top cover is detachably arranged on the annular fan unit; when the top cover is detachably arranged on the annular fan unit, the first protrusion is located outside the second protrusion, and the first protrusion is located below the second protrusion.

7. The hood of claim 1, wherein The air cap further comprises a driver fixedly connected to the base, the driver is provided with a driving shaft, the central shaft is directly or indirectly arranged on the driving shaft, and the central shaft is rotationally connected to the top cover through a first bearing.

8. A hood structure comprising a hood and a mounting base, said hood being removably provided to said mounting base, characterized in that, The air cap is the air cap of any one of claims 1 to 7, and the air cap is detachably arranged on the mounting seat through the base.

9. A flue system comprising a flue and a cowling structure, the flue being made of concrete, characterised in that, The air cap structure is the air cap structure of claim 8, and the mounting seat of the air cap structure is arranged on the flue through concrete.

10. A flue system comprising a flue and a cowling, the flue being made of metal, characterised in that, The air cap is the air cap of any one of claims 1 to 7, and the air cap is detachably arranged on the flue through the base.

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