CN214837222U - Low-noise exhaust device - Google Patents

Abstract

The utility model discloses a low noise exhaust device, including collection petticoat pipe, fan subassembly and cowling panel, the bottom of collection petticoat pipe is provided with an album mouth, the collection petticoat pipe is in collection petticoat pipe corresponds position department and heat transfer part fixed connection, the upper portion of collection petticoat pipe is provided with the exhaust port, the cowling panel is porous structure, the cowling panel is in the exhaust port correspond position department with collection petticoat pipe integrated into one piece or fixed, the fan subassembly is in the cowling panel correspond position department with it is sealed fixed to collect the petticoat pipe, be provided with air intake and air outlet on the fan subassembly, the exhaust port with the air intake passes through the cowling panel intercommunication, the fan subassembly passes through with external air the air outlet can open and close formula intercommunication. The utility model discloses a low noise exhaust device simple structure, effectively reduce the undulant of unstable air current production, reduce the vortex noise, improve the noise performance and the user of complete machine and use the travelling comfort.

Description

Low-noise exhaust device

Technical Field

The utility model relates to a gas heater technical field especially relates to a low noise exhaust device.

Background

The fan is one of key parts for air exhaust in a gas water heater and a gas heating furnace, and is an important part for providing air required by a combustion system. The prior art exhaust device is unreasonable in design for a fan flow channel and a sealing structure, so that severe airflow turbulence noise is generated under the condition of high wind speed, mainly embodied as vortex noise, airflow interference turbulence noise caused by non-uniform speed, vibration noise generated when airflow resistance is increased and the like, wherein the noise accounts for a large part of the proportion in the noise of the whole machine, and the user demands for low noise more and more.

Disclosure of Invention

The utility model relates to a solve not enough among the prior art and accomplish, the utility model aims at providing a simple structure, effectively reduce the undulant of unstable air current production, reduce the vortex noise, improve the noise performance of complete machine and the low noise exhaust device of user's use travelling comfort.

In order to achieve the above purpose, the solution of the invention is as follows:

the utility model discloses a low-noise exhaust device, which comprises a smoke collecting hood, a fan component and a rectifying plate, wherein the bottom of the smoke collecting hood is provided with a smoke collecting port, the smoke collecting hood is fixedly connected with a heat exchange component at the position corresponding to the smoke collecting port, and the upper part of the smoke collecting hood is provided with a smoke exhaust port; the rectifying plate is of a porous structure, the rectifying plate is integrally formed or fixed with the smoke collecting hood at the position corresponding to the smoke exhaust port, and at least one group of rectifying holes which are uniformly arranged in a ring shape with different radiuses and take the center of the rectifying plate as the center are arranged on the rectifying plate; the fan subassembly is in rectifying plate correspond position department with the collection petticoat pipe is sealed fixed, be provided with air intake and air outlet on the fan subassembly, the exhaust port with the air intake passes through the rectifying plate intercommunication, the fan subassembly passes through with ambient air the air outlet formula of can opening and close intercommunication.

Further, the aperture of the rectifying hole gradually increases outward in the radial direction of the rectifying plate.

Further, the aperture of the rectifying hole is 2-10 mm.

Further, the rectifying holes are provided with five groups including a first rectifying hole, a second rectifying hole, a third rectifying hole, a fourth rectifying hole and a fifth rectifying hole which are arranged from the center of the rectifying plate to the outside in the radial direction of the rectifying plate, wherein the diameter of the first rectifying hole is smaller than that of the second rectifying hole, and the diameter of the third rectifying hole is smaller than that of the fourth rectifying hole.

Further, the first rectifying hole is provided with two rings.

Further, the second rectifying hole is provided with two rings.

Further, the fourth rectifying hole is provided with two rings.

Further, the fan subassembly includes driving piece, spiral case body and centrifugal impeller, the detachable swivelling joint of centrifugal impeller in the inner chamber of spiral case body, the transversal archimedes's spiral setting of personally submitting of spiral case body, the air intake set up in the center pin of centrifugal impeller corresponds position department, the air intake with the exhaust port passes through the cowling panel intercommunication, the air outlet set up in the maximum diameter of spiral case body corresponds position department, the air outlet can open and close formula intercommunication with the external air, the spiral case body centrifugal impeller with the coaxial setting of output of driving piece, centrifugal impeller with the output meshing of driving piece is connected.

Further, the spiral case body includes first spiral case and second spiral case, first spiral case with the second spiral case encloses to establish to form and holds centrifugal impeller's cavity structure, first spiral case the second spiral case with the coaxial setting of centrifugal impeller, the cross section of first spiral case with the cross section of second spiral case all is the setting of archimedes' spiral line, the air intake set up in on the first spiral case and with the collection petticoat pipe is sealed fixed, the air outlet set up in first spiral case with the maximum diameter of second spiral case corresponds position department.

Furthermore, the air outlet corresponds position department and is provided with down draught piece, down draught piece with the fan subassembly is in the air outlet corresponds position department detachable fixed, the fan subassembly passes through down draught piece and outside air formula intercommunication that can open and shut.

The utility model discloses a low-noise exhaust device, which comprises a smoke collecting hood, a fan component and a rectifying plate, wherein the bottom of the smoke collecting hood is provided with a smoke collecting port, the smoke collecting hood is fixedly connected with a heat exchange component at the position corresponding to the smoke collecting port, and the upper part of the smoke collecting hood is provided with a smoke exhaust port; the rectifying plate is of a porous structure, the rectifying plate is integrally formed or fixed with the smoke collecting hood at the position corresponding to the smoke exhaust port, and at least one group of rectifying holes which are uniformly arranged in a ring shape with different radiuses and take the center of the rectifying plate as the center are arranged on the rectifying plate; the fan subassembly is in rectifying plate correspond position department with the collection petticoat pipe is sealed fixed, be provided with air intake and air outlet on the fan subassembly, the exhaust port with the air intake passes through the rectifying plate intercommunication, the fan subassembly passes through with ambient air the air outlet formula of can opening and close intercommunication. Thus, the collection petticoat pipe is through butt-joint concatenation or lock or riveting fixed integral type structure, collection smoke mouth set up in the bottom of collection petticoat pipe, the exhaust port set up in the upper portion of collection petticoat pipe, the collection petticoat pipe is in collection petticoat pipe corresponding position department with heat transfer part fixed connection, the collection petticoat pipe is in exhaust port corresponding position department with fan subassembly sealed fixed connection, collection petticoat pipe respectively with heat transfer part with fan subassembly intercommunication, simultaneously the fan subassembly is provided with the air outlet for the flue gas passageway by heat transfer part to the complete intercommunication of outside air, the flue gas can pass through collection petticoat pipe gets into collection petticoat pipe, then pass through the exhaust port gets into the fan subassembly, pass through the suction effect of fan subassembly is discharged into outdoor air, the cowling panel is porous structure and set up in the exhaust port with the intercommunication of air intake corresponds position department, make turbulent flue gas pass through porous structure the cowling panel rectifies the back, gets into air velocity when fan subassembly is even, has reduced right fan subassembly's impact noise, simultaneously also can obtain further reducing because of the vibration noise that unstable air current arouses, and then reduce the vortex noise, improve the noise performance and the user of complete machine and use the travelling comfort. But fan subassembly and outside air's open and close formula intercommunication for the flue gas is in the air outlet corresponds position department and is the one-way flow, promptly can only by fan subassembly flow to outside air for even in the chilly winter in the north, also can prevent effectively that outside cold air from pouring into the machine inside, avoid inside temperature to hang down the waterway part and other spare parts by freezing excessively. The utility model discloses a low noise exhaust device, the advantage for prior art is: simple structure, effectively reduce the undulant of unstable air current production, reduce the vortex noise, improve the noise performance and the user comfort of using of complete machine.

Drawings

Fig. 1 the utility model relates to a low noise exhaust device structure sketch map.

Fig. 2 the utility model relates to a low noise exhaust device collection petticoat pipe structure sketch map.

Fig. 3 is a right side view of the exhaust device of the utility model.

Fig. 4 is a schematic view of the flow direction of the flue gas of the low-noise exhaust device.

Fig. 5 is a schematic view of the spiral casing structure of the low-noise air exhaust device of the present invention.

Fig. 6 is an internal schematic view of a fan assembly of a low-noise air exhaust device.

Fig. 7 the utility model relates to a low noise exhaust device prevents down draught spare schematic structure.

Fig. 8 is a bottom view of a down draft prevention member of a low noise exhaust device.

Description of the figures

1. A smoke collecting hood; 1-1, a smoke collection port; 1-2, a smoke outlet;

2. a fan assembly; 2-1, an air inlet; 2-2, an air outlet; 2-3, a driving piece; 2-4, a volute body; 2-4-1, a first volute; 2-4-2, a second volute; 2-5, centrifugal impeller; 2-5-1, centrifugal blades; 2-5-2, wheel plate; 2-6, radiating blades;

3. a rectifying plate; 3-1, a rectifying hole; 3-1-1, a first rectifying hole; 3-1-2, a second flow straightening hole; 3-1-3, a third flow straightening hole; 3-1-4, a fourth rectifying hole; 3-1-5, a fifth rectifying hole; 4. a downdraft prevention member; 4-1, a cylinder body; 4-2, a rotating shaft; 4-3, a baffle.

Detailed Description

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "vertical", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model discloses a low noise exhaust device, with air outlet 2-2 is in the upside, collection cigarette mouth 1-1 is in the downside, first spiral case 2-4-1 is in the left side, second spiral case 2-4-2 is on the right side to confirm the direction of "left", "right", "upper" and "lower" with this.

A low noise exhaust device according to the present invention will be described in further detail with reference to fig. 1 to 8 of the drawings.

The utility model relates to a low-noise exhaust device, please refer to the relevant drawings in fig. 1 to 8, which comprises a smoke collecting hood 1, a fan component 2 and a rectifying plate 3, wherein the bottom of the smoke collecting hood 1 is provided with a smoke collecting port 1-1, the smoke collecting hood 1 is fixedly connected with a heat exchange component at the position corresponding to the smoke collecting port 1-1, and the upper part of the smoke collecting hood 1 is provided with a smoke exhaust port 1-2; the rectifying plate 3 is of a porous structure, the rectifying plate 3 is integrally formed or fixed with the smoke collecting hood 1 at a position corresponding to the smoke outlet 1-2, and at least one group of rectifying holes 3-1 which are annularly and uniformly arranged by taking the center of the rectifying plate 3 as the center and taking different radiuses as the center are arranged on the rectifying plate 3; the fan component 2 is in the position corresponding to the rectifying plate 3 and is sealed and fixed with the smoke collecting hood 1, the fan component 2 is provided with an air inlet 2-1 and an air outlet 2-2, the smoke outlet 1-2 is communicated with the air inlet 2-1 through the rectifying plate 3, and the fan component 2 is communicated with the outside air in an openable and closable manner through the air outlet 2-2. Thus, the fume collecting hood 1 is an integrated structure which is spliced by butt welding or fastened or riveted and fixed, the fume collecting port 1-1 is arranged at the bottom of the fume collecting hood 1, the exhaust port 1-2 is arranged at the upper part of the fume collecting hood 1, the fume collecting hood 1 is fixedly connected with the heat exchange component at the position corresponding to the fume collecting port 1-1, the fume collecting hood 1 is fixedly connected with the fan component 2 at the position corresponding to the exhaust port 1-2 in a sealing way, the fume collecting hood 1 is respectively communicated with the heat exchange component and the fan component 2, meanwhile, the fan component 2 is provided with the air outlet 2-2, so that a fume channel is completely communicated with the outside air through the heat exchange component, and fume can enter the fume collecting hood 1 through the fume collecting port 1-1 and then enters the fan component 2 through the exhaust port 1-2, is discharged into the outdoor air by the suction action of the fan assembly 2. But fan subassembly 2 and outside air's formula intercommunication of opening and close for the flue gas is in air outlet 2-2 corresponds position department is one-way flow, can only by promptly fan subassembly 2 flows to outside air, makes even in the chilly winter in the north, also can prevent effectively that outside cold air from pouring into the machine inside, avoids inside temperature to hang down frost crack water route part and other spare parts excessively.

Specifically, the rectifying plate 3 is of a porous structure and is arranged at a position corresponding to the communicating position of the smoke outlet 1-2 and the air inlet 2-1, so that turbulent smoke enters the fan assembly 2 after being rectified by the rectifying plate 3 of the porous structure, the air flow velocity is uniform, the impact noise of the fan assembly 2 is reduced, meanwhile, the vibration noise caused by unstable air flow can be further reduced, the vortex noise is reduced, and the noise performance of the whole machine and the use comfort of a user are improved.

Specifically, at least one group of rectifying holes 3-1 which are uniformly arranged in a ring shape with different radiuses and take the center of the rectifying plate 3 as the center are arranged on the rectifying plate 3. Therefore, the rectifying hole 3-1 is arranged on the rectifying plate 3 to rectify the smoke entering the fan assembly 2, so that the smoke enters the fan assembly 2 through the rectifying hole 3-1, the flow rate of the smoke is uniform, the smoke enters the fan assembly 2 more smoothly instead of entering the fan assembly 2 by changing the angle suddenly, the smoke airflow is prevented from forming a vortex, and the noise generated by the fan assembly 2 due to the direct impact of turbulent smoke is reduced. When the rectifying hole 3-1 is a group, the rectifying hole 3-1 is a plurality of, the rectifying hole 3-1 is annularly arranged on the rectifying plate 3, the radius of each rectifying hole 3-1 is consistent, when the rectifying hole 3-1 is more than two groups, the rectifying holes 3-1 are a plurality of, the aperture of the rectifying hole 3-1 in each group is consistent, the center of the rectifying plate 3 is used as the center, the rectifying holes 3-1 in two groups are respectively arranged on two rings with different radii, and the aperture of the rectifying hole 3-1 in the same ring is consistent.

The utility model discloses a low noise exhaust device please refer to relevant each picture in fig. 1 to fig. 8, can also be on the basis of preceding technical scheme: the aperture of the rectifying hole 3-1 gradually increases outward in the radial direction of the rectifying plate 3. Therefore, according to the difference of the airflow velocity at different height positions in the fume collecting hood 1, the closer to the edge of the rectifying plate 3, the smaller the flow velocity of the flue gas is, so that the flue gas can be promoted to pass through the rectifying hole 3-1 with a larger aperture, and the closer to the center of the rectifying plate 3, the larger the flow velocity of the flue gas is, and further the flue gas at the position is promoted to be decelerated through the rectifying hole 3-1 with a smaller aperture, so that the uniform flow velocity of the flue gas at each part of the corresponding position of the rectifying plate 3 is achieved.

The utility model discloses a low noise exhaust device please refer to relevant each picture in fig. 1 to fig. 8, can also be on the basis of preceding technical scheme: the aperture of the rectifying hole 3-1 is 2-10 mm. Therefore, the air ducts in the fan assembly 2 are matched for use, and the aperture of the rectifying hole 3-1 is calculated and determined to be 2-10mm according to the channel area required by air exhaust, so that the flow velocity of the flue gas entering the fan assembly 2 is balanced after the flue gas passes through the rectifying hole 3-1.

The utility model discloses a low noise exhaust device please refer to relevant each picture in fig. 1 to fig. 8, can also be on the basis of preceding technical scheme: the rectifying holes 3-1 are provided with five groups, the five groups comprise a first rectifying hole 3-1-1, a second rectifying hole 3-1-2, a third rectifying hole 3-1-3, a fourth rectifying hole 3-1-4 and a fifth rectifying hole 3-1-5 which are arranged from the center of the rectifying plate 3 radially outwards of the rectifying plate 3, and the aperture of the first rectifying hole 3-1-1 is smaller than that of the second rectifying hole 3-1-2, the aperture of the third rectifying hole 3-1-3 is smaller than that of the fourth rectifying hole 3-1-4, and the aperture of the fifth rectifying hole 3-1-5 is smaller than that of the fourth rectifying hole 3-1-3. In this way, the first rectifying hole 3-1-1 is arranged at a corresponding position in the center of the rectifying plate 3, and may be one first rectifying hole 3-1-1, or may be an annular structure in which a plurality of first rectifying holes 3-1-1 are surrounded at the center of the rectifying plate 3, a plurality of second rectifying holes 3-1-2 are formed in an annular shape around the annular structure formed by the first rectifying holes 3-1-1, a plurality of third rectifying holes 3-1-3 are formed in an annular shape around the annular structure formed by the second rectifying holes 3-1-2, and so on, the fourth rectifying hole 3-1-4 and the fifth rectifying hole 3-1-5 are respectively arranged in a circle on the rectifying plate 3, according to the different flue gas flow velocity at different height positions in the fume collecting hood 1, when the fume extends outwards from the center of the rectifying plate 3 along the radial direction, the larger the extending distance is, the smaller the flue gas flow velocity is, and the annular structure formed by the first rectifying hole 3-1-1, the second rectifying hole 3-1-2, the third rectifying hole 3-1-3, the fourth rectifying hole 3-1-4 and the fifth rectifying hole 3-1-5 also extends radially outward from the center of the rectifying plate 3, the required bore diameter is therefore larger and larger, so that the bore diameter of the first rectifying hole 3-1-1, the bore diameter of the second rectifying hole 3-1-2, the bore diameter of the third rectifying hole 3-1-3, the bore diameter of the fourth rectifying hole 3-1-4 and the bore diameter of the fifth rectifying hole 3-1-5 increase in succession.

Specifically, the first rectifying hole 3-1-1 is provided with two rings. In this way, the required channel areas of different air ducts and exhaust air are calculated and determined, the flue gas flow velocities at the positions corresponding to the first rectifying hole 3-1-1 of the inner ring and the first rectifying hole 3-1-1 of the outer ring are approximately consistent, so the required aperture diameters at the two positions are also approximately consistent, for convenience of processing, the aperture diameters of the first rectifying hole 3-1-1 of the two rings are set to be consistent, the flow velocity of the flue gas is not affected basically, and the air flow direction and the air flow velocity at the position corresponding to the first rectifying hole 3-1-1 of the two rings are adjusted.

Alternatively, the first rectifying hole 3-1-1 is provided with two rings and the hole diameter of each ring is gradually increased along the radial direction of the rectifying plate 3. In this way, it is determined by calculation according to the channel areas required by different air ducts and exhaust air, because the flue gas flow rate of the first rectifying hole 3-1-1 of the inner ring is greater than the flue gas flow rate at the position corresponding to the first rectifying hole 3-1-1 of the outer ring, in order to make the flue gas flow rates at these two positions approximately consistent, the aperture of the first rectifying hole 3-1-1 of the inner ring needs to be smaller than the aperture of the first rectifying hole 3-1-1 of the outer ring, so the first rectifying hole 3-1-1 is set to be two rings and the aperture of each ring gradually increases outwards along the radial direction of the rectifying plate 3.

The utility model discloses a low noise exhaust device please refer to relevant each picture in fig. 1 to fig. 8, can also be on the basis of preceding technical scheme: the second flow straightening hole 3-1-2 is provided with two rings. In this way, the required channel areas of different air ducts and exhaust air are calculated and determined, the flue gas flow velocities at the positions corresponding to the second rectifying hole 3-1-2 of the inner ring and the second rectifying hole 3-1-2 of the outer ring are approximately consistent, so the required aperture diameters at the two positions are also approximately consistent, for convenience of processing, the aperture diameters of the second rectifying hole 3-1-2 of the two rings are set to be consistent, the flow velocity of the flue gas is not affected basically, and the air flow direction and the air flow velocity at the position corresponding to the second rectifying hole 3-1-2 of the two rings are adjusted.

Alternatively, the second rectifying hole 3-1-2 is provided with two rings and the hole diameter of each ring is gradually increased along the radial direction of the rectifying plate 3. In this way, it is determined by calculation according to the channel areas required by different air ducts and exhaust air, because the flue gas flow rate of the second rectifying hole 3-1-2 of the inner ring is greater than the flue gas flow rate at the position corresponding to the second rectifying hole 3-1-2 of the outer ring, in order to make the flue gas flow rates at the two positions approximately consistent, the aperture of the second rectifying hole 3-1-2 of the inner ring is required to be smaller than the aperture of the second rectifying hole 3-1-2 of the outer ring, so that the second rectifying hole 3-1-2 is set to be two rings and the aperture of each ring gradually increases outwards along the radial direction of the rectifying plate 3.

The utility model discloses a low noise exhaust device please refer to relevant each picture in fig. 1 to fig. 8, can also be on the basis of preceding technical scheme: the fourth rectifying hole 3-1-4 is provided with two rings. In this way, the required channel areas of different air ducts and exhaust air are calculated and determined, the flue gas flow velocities at the positions corresponding to the fourth rectifying holes 3-1-4 of the inner ring and the fourth rectifying holes 3-1-4 of the outer ring are approximately consistent, so the required aperture diameters at the two positions are also approximately consistent, for convenience of processing, the aperture diameters of the fourth rectifying holes 3-1-4 of the two rings are set to be consistent, the flow velocity of the flue gas is not affected basically, and the air flow direction and the air flow velocity at the positions corresponding to the fourth rectifying holes 3-1-4 of the two rings are adjusted.

Alternatively, the fourth rectifying hole 3-1-4 is provided with two rings and the hole diameter of each ring is gradually increased along the radial direction of the rectifying plate 3. In this way, it is determined by calculation according to the channel areas required by different air ducts and exhaust air, because the flue gas flow rate of the fourth rectifying hole 3-1-4 of the inner ring is greater than the flue gas flow rate at the position corresponding to the fourth rectifying hole 3-1-4 of the outer ring, in order to make the flue gas flow rates at these two positions approximately consistent, the aperture of the fourth rectifying hole 3-1-4 of the inner ring needs to be smaller than the aperture of the fourth rectifying hole 3-1-4 of the outer ring, so that the fourth rectifying hole 3-1-4 is set to be two rings and the aperture of each ring gradually increases outwards along the radial direction of the rectifying plate 3.

The utility model discloses a low noise exhaust device please refer to relevant each picture in fig. 1 to fig. 8, can also be on the basis of preceding technical scheme: the fan component 2 comprises a driving piece 2-3, a volute body 2-4 and a centrifugal impeller 2-5, the centrifugal impeller 2-5 is detachably and rotatably connected with an inner cavity of the volute body 2-4, the cross section of the volute body 2-4 is arranged in an Archimedes spiral line, the air inlet 2-1 is arranged at a position corresponding to a central shaft of the centrifugal impeller 2-5, the air inlet 2-1 is communicated with the smoke exhaust port 1-2 through the rectifying plate 3, the air outlet 2-2 is arranged at a position corresponding to the maximum diameter of the volute body 2-4, the air outlet 2-2 is communicated with external air in an openable and closable manner, and the volute body 2-4, the centrifugal impeller 2-5 and an output end of the driving piece 2-3 are coaxially arranged, the centrifugal impeller 2-5 is meshed and connected with the output end of the driving part 2-3. In this way, the driving member 2-3 may be a driving motor, an output shaft of the driving member 2-3 is coaxially disposed with the centrifugal impeller 2-5, the driving member 2-3 may be directly or detachably fixed to the volute body 2-4 through a bracket, so that the driving motor can drive the centrifugal impeller 2-5 to rotate, the volute body 2-4 is enclosed on the periphery of the centrifugal impeller 2-5, so that an air duct is formed between the volute body 2-4 and the centrifugal impeller 2-5, and the air inlet 2-1 is disposed at a position corresponding to a central axis of the centrifugal impeller 2-5, so that when flue gas enters the fan assembly 2, flue gas enters from one side of the central axis of the centrifugal impeller 2-5.

Specifically, the cross section of the volute body 2-4 is an archimedes spiral line, and the starting end of the archimedes spiral line is located on the central axis of the volute body 2-4 and is in an involute shape, so that the tail end of the archimedes spiral line is the maximum diameter position, the air outlet 2-2 is arranged at the position corresponding to the maximum diameter of the volute body 2-4, namely the tail end of the archimedes spiral line, so that the internal particles of the flue gas flow tend to stable speed and direction in the air duct, the energy loss along the way is basically eliminated, the flue gas flow is always in a laminar flow state from the air inlet 2-1 to the air outlet 2-2 without turbulence, the noise generated when the flue gas forms turbulence is further reduced, and the resistance of the volute body 2-4 to the flue gas is reduced, further ensuring that the flue gas flow is in a stable state at the centrifugal impeller 2-5 without generating turbulent flow, reducing the noise generated by the flue gas at the centrifugal impeller 2-5, and having small flow resistance of the flow channel and smooth air exhaust. The centrifugal impeller 2-5 can be made of aluminum alloy materials and is of a plug-in sheet type structure, the centrifugal blades 2-5-1 are uniformly and tidily distributed between the two impeller plates 2-5-2 of the centrifugal impeller 2-5, the two ends of the centrifugal blades 2-5-1 are connected with the impeller plates 2-5-2 in a plug-in mode, the surface of the centrifugal impeller 2-5 is smooth, the resistance coefficient is low, the friction resistance between airflow and the centrifugal blades 2-5-1 is small, and the boundary layer of the surface of the centrifugal blades 2-5-1 is thin, so that the problem that the air discharge amount is reduced due to the thickness of the boundary layer is not prone to being generated, the efficiency of the fan is improved, and meanwhile, the noise generated by boundary layer separation is also reduced.

Specifically, the volute body 2-4 includes a first volute 2-4-1 and a second volute 2-4-2, the first volute 2-4-1 and the second volute 2-4-2 are enclosed to form a cavity structure for accommodating the centrifugal impeller 2-5, the first volute 2-4-1, the second volute 2-4-2 and the centrifugal impeller 2-5 are coaxially disposed, a cross section of the first volute 2-4-1 and a cross section of the second volute 2-4-2 are both arranged in an archimedean spiral, the air inlet 2-1 is disposed on the first volute 2-4-1 and is fixed to the smoke collecting hood 1 in a sealing manner, and the air outlet 2-2 is disposed on a maximum diameter of the first volute 2-4-1 and a maximum diameter of the second volute 2-4-2 At the corresponding position. In this way, the first volute 2-4-1 and the second volute 2-4-2 are respectively enclosed at the left part and the right part of the centrifugal impeller 2-5, the first volute 2-4-1 and the second volute 2-4-2 can be symmetrically arranged or asymmetrically arranged, when the first volute 2-4-1 and the second volute 2-4-2 are symmetrically arranged, the cross section of the first volute 2-4-1 and the cross section of the second volute 2-4-2 correspond and have the same width, and when the first volute 2-4-1 and the second volute 2-4-2 are asymmetrically arranged, the widths of the first volute 2-4-1 and the second volute 2-4-2 are different but the cross sections of the first volute 2-4-1 and the second volute 2-4-2 are correspondingly arranged, the air inlet 2-1 is arranged at the left part of the first volute 2-4-1, so that flue gas enters the fan assembly 2 and then enters the fan assembly from the left end of the central shaft of the centrifugal impeller 2-5, the driving member 2-3, namely the output shaft of the driving motor, is arranged at the right end of the central shaft of the centrifugal impeller 2-5, so that when the driving member 2-3 drives the centrifugal impeller 2-5 to rotate, the flue gas enters the inner side of the centrifugal impeller 2-5, passes through the centrifugal impeller 2-5, enters the air duct, and finally enters external air from the air outlet 2-2. When the first volute 2-4-1 and the second volute 2-4-2 are made of electrolytic plates, flow resistance of a flow channel is further reduced, air exhaust is smooth, and noise is low.

Specifically, heat dissipation blades 2-6 are arranged between the volute body 2-4 and the driving piece 2-3, and the heat dissipation blades 2-6 are meshed and connected with the output end of the driving piece 2-3. In this way, the heat dissipating blades 2-6 may be a wheel-shaped structure, and when the driving member 2-3 drives the centrifugal impeller 2-5 to rotate to perform air exhaust, the heat dissipating blades 2-6 may be driven to rotate at the same time, so that on one hand, air disturbance between the driving member 2-3 and the volute body 2-4 may be enhanced, air circulation may be accelerated, and continuous convection heat exchange may be formed during operation, and on the other hand, the surface temperature rise of the driving member 2-3 and the volute body 2-4 may be reduced, and the service life thereof may be prolonged.

The utility model discloses a low noise exhaust device please refer to relevant each picture in fig. 1 to fig. 8, can also be on the basis of preceding technical scheme: the air outlet 2-2 corresponds to the position and is provided with a down draught prevention piece 4, the down draught prevention piece 4 and the fan component 2 are detachably fixed at the position corresponding to the air outlet 2-2, and the fan component 2 can be communicated with the outside air in an opening and closing mode through the down draught prevention piece 4. Like this, even can prevent effectively in the north winter that external cold air from flowing backward into the machine inside, avoid inside temperature to hang down the water route part and other spare parts by freezing excessively.

Specifically, the anti-backflow part 4 can include a cylinder 4-1, a rotating shaft 4-2 and at least one blocking piece 4-3, the semicircular blocking piece 4-3 is rotatably connected to the rotating shaft 4-2, the rotating shaft 4-2 is integrally formed or fixed on the cylinder 4-1, the cylinder 4-1 and the volute body 2-4 are detachably fixed in a sealing manner and communicated, the blocking piece 4-3 is of a single-side opening type, and only in the air exhaust process of the fan assembly 2, smoke can blow the blocking piece 4-3 to be opened outwards for air exhaust.

The above description is only for the description of several embodiments of the present invention, but the scope of the present invention should not be considered as falling within the scope of the present invention, in which all the equivalent changes or modifications or the equal-scale enlargement or reduction etc. according to the design spirit of the present invention are made.

Claims (10)

1. The utility model provides a low noise exhaust device which characterized in that: comprises a smoke collecting hood (1), a fan component (2) and a rectifying plate (3);

a smoke collecting port (1-1) is formed in the bottom of the smoke collecting hood (1), the smoke collecting hood (1) is fixedly connected with a heat exchange component at a position corresponding to the smoke collecting port (1-1), and a smoke exhaust port (1-2) is formed in the upper portion of the smoke collecting hood (1);

the rectifying plate (3) is of a porous structure, the rectifying plate (3) is integrally formed or fixed with the smoke collecting hood (1) at the position corresponding to the smoke exhaust port (1-2), and at least one group of rectifying holes (3-1) which are annularly and uniformly arranged by taking the center of the rectifying plate (3) as the center and different radiuses are arranged on the rectifying plate (3);

fan subassembly (2) fan subassembly (3) correspond position department with collection petticoat pipe (1) is sealed fixed, be provided with air intake (2-1) and air outlet (2-2) on fan subassembly (2), exhaust port (1-2) with air intake (2-1) pass through cowling panel (3) intercommunication, fan subassembly (2) pass through with outside air outlet (2-2) can open and close formula intercommunication.

2. A low noise air discharge device according to claim 1, wherein: the aperture of the rectifying hole (3-1) is gradually increased along the radial direction of the rectifying plate (3).

3. A low noise air discharge device according to claim 1, wherein: the aperture of the rectifying hole (3-1) is 2-10 mm.

4. A low noise air discharge device according to claim 1, wherein: the rectifying holes (3-1) are provided with five groups, the five groups comprise a first rectifying hole (3-1-1), a second rectifying hole (3-1-2), a third rectifying hole (3-1-3), a fourth rectifying hole (3-1-4) and a fifth rectifying hole (3-1-5) which are arranged from the center of the rectifying plate (3) along the radial direction of the rectifying plate (3) outwards, and the aperture of the first rectifying hole (3-1-1) is smaller than that of the second rectifying hole (3-1-2) is smaller than that of the third rectifying hole (3-1-3) is smaller than that of the fourth rectifying hole (3-1-4) is smaller than that of the fifth rectifying hole (3-1-5).

5. A low noise air exhaust device according to claim 4, wherein: the first rectifying hole (3-1-1) is provided with two rings.

6. A low noise air exhaust device according to claim 4, wherein: the second rectifying hole (3-1-2) is provided with two rings.

7. A low noise air exhaust device according to claim 4, wherein: the fourth rectifying hole (3-1-4) is provided with two rings.

8. A low noise exhaust device according to any of claims 1 to 7, wherein: fan subassembly (2) is including driving piece (2-3), spiral case body (2-4) and centrifugal impeller (2-5), the detachable swivelling joint in of centrifugal impeller (2-5) in the inner chamber of spiral case body (2-4), the transversal Archimedes helix setting of personally submitting of spiral case body (2-4), air intake (2-1) set up in the center pin of centrifugal impeller (2-5) corresponds position department, air intake (2-1) with exhaust port (1-2) pass through cowling panel (3) intercommunication, air outlet (2-2) set up in the maximum diameter of spiral case body (2-4) corresponds position department, air outlet (2-2) can open and close formula intercommunication with outside air, spiral case body (2-4), The centrifugal impeller (2-5) and the output end of the driving part (2-3) are coaxially arranged, and the centrifugal impeller (2-5) is meshed and connected with the output end of the driving part (2-3).

9. A low noise exhaust device according to claim 8, wherein: the volute body (2-4) comprises a first volute (2-4-1) and a second volute (2-4-2), the first volute (2-4-1) and the second volute (2-4-2) are arranged in a surrounding mode to form a cavity structure for containing the centrifugal impeller (2-5), the first volute (2-4-1), the second volute (2-4-2) and the centrifugal impeller (2-5) are arranged coaxially, the cross section of the first volute (2-4-1) and the cross section of the second volute (2-4-2) are arranged in an Archimedes spiral line mode, the air inlet (2-1) is arranged on the first volute (2-4-1) and is fixed with the smoke collecting hood (1) in a sealing mode, the air outlet (2-2) is arranged at the position corresponding to the maximum diameter of the first volute (2-4-1) and the second volute (2-4-2).

10. A low noise exhaust device according to any of claims 1 to 7, wherein: the air outlet (2-2) corresponds position department and is provided with down draught prevention piece (4), down draught prevention piece (4) with fan subassembly (2) are in air outlet (2-2) corresponds position department detachable fixed, fan subassembly (2) pass through down draught prevention piece (4) and outside air can open and close formula intercommunication.

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