Exhaust device and gas water heater using the same

Abstract

The present invention provides an exhaust device, comprising a smoke exhaust hood, a guide plate of a trapezoidal structure, a motor assembly and a smoke exhaust pipe, wherein the smoke exhaust hood is provided with a smoke collecting port at one end and a smoke exhaust port at the other end, the guide plate is arranged at the smoke exhaust port and corresponds to the motor assembly, the guide plate is provided with holes for guiding and rectifying, the motor assembly is connected to the smoke exhaust pipe, and the guide plate rectifies and guides the smoke in the smoke exhaust hood and then discharges the smoke to the smoke exhaust pipe through the motor assembly; the flow channel of the exhaust device is more reasonable and the airflow noise generated is lower; a gas water heater utilizing the exhaust device is also provided, so that the noise generated by the gas water heater is lower and the smoke index is better.

Description

Technical Field

[0001] The present invention relates to the technical field of gas water heaters, and in particular to an exhaust device and a gas water heater using the same. Background Art

[0002] The fan is one of the key exhaust components in gas water heaters and gas heating furnaces. It is mainly an important component for providing the air required by the combustion system. In the prior art, the exhaust device has unreasonable design of the fan flow channel and air outlet structure, resulting in severe air flow turbulence noise under conditions of high wind speed, mainly manifested in eddy noise, air flow interference turbulence noise caused by uneven speed, and vibration noise generated when the air flow resistance increases, etc., and users are increasingly demanding to reduce noise. Summary of the invention

[0003] The object of the present invention is to provide an exhaust device and a gas water heater using the same, which can effectively reduce the fluctuations caused by unstable airflow, reduce eddy noise, reduce the high-speed impact of airflow on the impeller, and improve the noise performance of the whole machine.

[0004] To achieve the above object, the solution of the present invention is:

[0005] An exhaust device comprises a smoke exhaust hood, a guide plate of a trapezoidal structure, a motor assembly and a smoke exhaust pipe, wherein the smoke exhaust hood is provided with a smoke collecting port at one end and a smoke exhaust port at the other end, the guide plate is arranged at the smoke exhaust port and corresponds to the motor assembly, the guide plate is provided with holes for guiding and rectifying, the motor assembly is connected to the smoke exhaust pipe, and the guide plate rectifies and guides the smoke in the smoke exhaust hood and then discharges the smoke to the smoke exhaust pipe through the motor assembly.

[0006] Furthermore, the guide plate includes an upper stepped surface, a side surface and a bottom surface, the upper stepped surface and the side surface are both provided with the holes, the upper stepped surface is connected to the side surface and forms an angle θ, and the bottom surface is connected to the side surface and is provided on the smoke exhaust hood.

[0007] Further, the area of ​​one or more circular holes is combined to form a ventilation area S1, and the ventilation area S1 is smaller than or equal to the area S2 of the smoke exhaust port.

[0008] Furthermore, the diameter d of the hole is 1.5 to 10 mm.

[0009] Furthermore, the area S2 of the smoke exhaust port is greater than or equal to 2826 square millimeters, and the surface area S of the guide plate is greater than the area S2 of the smoke exhaust port.

[0010] Furthermore, the angle θ is 95 to 165 degrees.

[0011] Furthermore, the height of the upper stepped surface from the bottom surface is 5 to 35 mm.

[0012] Furthermore, the motor assembly includes a volute, a motor, a wind wheel and heat dissipation blades, the wind wheel is connected to the motor, the heat dissipation blades are arranged between the volute and the motor, and the volute is connected to the smoke exhaust hood and corresponds to the guide plate.

[0013] Furthermore, the volute includes a left volute and a right volute that can be buckled together, and the cross-sectional line of the volute adopts an Archimedean spiral line.

[0014] A gas water heater comprises an exhaust device as described in any one of the above items.

[0015] After adopting the above technical solution, the air flow channel is more reasonable and the air flow noise is reduced; the flue gas air flow velocity distribution after passing through the guide plate is more uniform, the vortex formation is small, and the noise generated is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A three-dimensional diagram of an exhaust device is provided for Example 1 of the present invention;

[0018] Figure 2 A structural diagram of an exhaust device is provided for Example 1 of the present invention;

[0019] Figure 3 A three-dimensional diagram of a smoke exhaust hood in an exhaust device is provided for Example 1 of the present invention;

[0020] Figure 4 A three-dimensional diagram of a guide plate in an exhaust device is provided for Example 1 of the present invention;

[0021] Figure 5 for Figure 4 Left view of . DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] Embodiment 1:

[0024] like Figure 1As shown in or 2, an exhaust device includes a smoke exhaust hood 1, a guide plate 2, a motor assembly 3 and a smoke exhaust pipe 4. The smoke exhaust hood 1 is fixed as a whole by welding, snapping or riveting. A smoke collecting port 11 is opened at one end of the smoke exhaust hood 1, and a smoke exhaust port 12 is opened at the other end. The smoke collecting port 11 corresponds to the heat exchange component of the gas water heater and is used to extract the smoke generated by the heat exchange component.

[0025] Specifically, the smoke collecting port 11 is arranged at the bottom of the smoke exhaust hood 1, and the smoke exhaust port 12 is arranged at one side of the smoke exhaust hood 1; the motor assembly 3 is fixedly and sealedly connected to the smoke exhaust hood 1, and the smoke enters the smoke exhaust hood 1 through the smoke collecting port 11, and the guide plate 2 is arranged at the smoke exhaust port 12 and corresponds to the motor assembly 3, and the guide plate is provided with holes 21 for rectification and diversion, and the smoke passes through the guide and rectification effect of the guide plate 2 on the smoke and then enters the motor assembly 3, and the motor assembly 3 is connected to the smoke exhaust pipe 4, and finally the smoke is discharged to the outside from the smoke exhaust pipe 4, and the smoke exhaust pipe 4 is provided with anti-backwind blades to prevent the backflow of external wind; through the rectification and diversion effect of the guide plate 2, the smoke entering the motor assembly 3 is smoother and the speed is more uniform, reducing the noise generated by the airflow, and after adopting the guide plate 2, the noise generated by the entire exhaust device is smaller than that of the exhaust device of the previous gas water heater, which is reduced by about 5 decibels, and the noise is significantly improved.

[0026] Specifically, the flow channel in the smoke exhaust hood 1 is a streamlined flow channel. By setting the flow channel of the smoke exhaust hood 1 to a streamlined structure, the flow channel is reasonable and the airflow noise is effectively reduced; and the smoke in the smoke exhaust hood 1 is rectified and guided through the holes 21 opened on the guide plate, so that the air flow velocity entering the motor assembly 3 is more uniform, effectively reducing the impact noise on the motor assembly 3, and further reducing the vibration noise caused by unstable airflow. The noise reduction effect is good, and the user experience is improved.

[0027] like Figure 3 , 4 or Figure 5 Furthermore, the guide plate 2 includes an upper stepped surface 22, a side surface 23 and a bottom surface 24, the upper stepped surface 22 is connected to the side surface 23 and forms an angle θ5, the bottom surface 24 is connected to the side surface 23 and is connected to the smoke exhaust hood 1 by welding or screws, or the guide plate 2 is integrally formed with the smoke exhaust hood 1 and welded or screwed to the smoke exhaust hood 1. The integral forming is convenient for installation and has lower cost.

[0028] like Figure 3As shown in or 4, further, the upper step surface 22 and the side surface 23 are both provided with a hole 21. When the airflow enters the smoke exhaust hood 1, it is guided and rectified through the hole 21, and the turbulent smoke in the smoke exhaust hood 1 is rectified through the hole 21, so that the airflow speed entering the motor assembly 3 is uniform, the noise generated by the impact on the motor assembly 3 is reduced, the exhaust is smoother, and the noise is lower.

[0029] like Figure 4 As shown, further, in order to make the airflow speed more uniform and the noise lower, one or more circular holes 21 are used on the upper step surface 22 and the side surface 23, and the total area of ​​the circular holes 21 is the ventilation area and is recorded as S1. The ventilation area S1 = 0.25Nπd 2 , where N represents the number of circular holes 21 opened on the guide plate 2, and d represents the diameter of the circular hole 21; the surface area formed by the upper stepped surface 22 and the side surface 23 is the air outlet area, which is recorded as S2, wherein the ventilation area S1 is less than or equal to the air outlet area S2 formed by the upper stepped surface 22 and the side surface 23; specifically, the ventilation area S1 ≥ 1.1S2, S2 ≥ 2826mm 2 The diameter d of the circular hole 21 is 1.5-10 mm, and the length, width and height of the guide plate 2 are slightly larger than the exhaust port 12 of the exhaust hood 1, so that the smoke in the entire exhaust hood 1 can be rectified, the rectification effect is better, the airflow velocity of the smoke is more uniform, and the noise is lower; in order to achieve the best rectification effect, the number of the circular holes 21 is 495, and the diameter d is 3 mm. Therefore, the calculation shows that S1 is 3497 mm 2 .

[0030] like Figure 5 As shown, further, the angle θ5 is 95 to 165 degrees; specifically, in the present embodiment, the inner angle θ5 formed between the upper step surface 22 and the side surface 23 is 135 degrees, so that more turbulent flue gases can be rectified, and the rectified flue gases are more uniform without causing further turbulence between each other, thereby achieving an average flue gas flow velocity and lower noise.

[0031] like Figure 5 As shown, further, the height of the upper step surface 22 from the bottom surface 24 is 5 to 35 mm. In order to make the flue gas flow velocity more stable and the noise low, in this embodiment, the height is preferably 10 to 15 mm. The height can also be determined according to the number of the circular holes 21.

[0032] like Figure 5 As shown, further, the guide plate 2 adopts a trapezoidal structure, which is more stable in structure, not easy to fall off at the smoke outlet 12, and has a better smoke rectification effect.

[0033] Furthermore, the guide plate 2 is made of an electrolytic plate, which can improve the uniformity of the airflow and has good corrosion resistance.

[0034] like Figure 2 As shown, further, the motor assembly 3 includes a volute 31, a motor 32, a wind wheel 33 and a heat dissipation blade 34, the volute 31 is connected to the smoke exhaust hood 1 by snap-fitting and screw sealing, the smoke exhaust pipe 4 is welded to the volute 31, the smoke exhaust port 12 is connected to the volute 31, the wind wheel 33 is arranged in the volute, and the motor 32 is riveted and fixed to the volute 31 through a bracket, which is used to drive the wind wheel 33 to rotate.

[0035] The heat dissipation blades 34 are evenly and neatly distributed on the wind wheel 33 and plugged into the wind wheel 33 . The surface of the heat dissipation blades 34 is smooth, so that the resistance when the airflow contacts the heat dissipation blades 34 is smaller, thereby reducing the noise generated by the airflow and the heat dissipation blades 34 .

[0036] Specifically, the heat dissipation blade 34 is made of aluminum alloy, and the surface and structure of the heat dissipation blade 34 are set to be smooth, which can make the surface boundary layer of the heat dissipation blade 34 thin, thereby not easily causing the problem of reduced exhaust volume due to the thickness of the boundary layer, effectively improving the fan efficiency, and at the same time, the noise generated by the boundary layer separation will also be reduced, and the surface temperature rise of the motor 32 and the volute 31 can also be reduced, thereby extending their service life.

[0037] Specifically, the formation of the boundary layer is mainly due to the contact between the fluid and the solid, such as the contact between the air and the heat sink blade 34. Due to the viscous shear force inside the air itself, the air and the heat sink blade 34 have a velocity gradient near the wall and far from the wall, and the velocity near the wall is lower. This is a problem that will exist when a fluid of a certain speed flows through a solid, and the thickness is a matter of thickness. The smoother the surface, the thinner the corresponding layer will be, and the number of vortices generated during separation will be reduced, resulting in lower noise.

[0038] The flow passage of the volute 31 adopts an Archimedean spiral type, which has smaller flow resistance, smooth exhaust and low noise.

[0039] The wind wheel 33 is connected to the rotating shaft of the motor 32 through a rotating shaft. There are heat dissipation blades 34 between the volute 31 and the motor 32. The smoke enters the smoke exhaust hood 1 through the smoke collecting port 11. The guide plate 2 corresponds to the volute 31. After being rectified and guided by the guide plate 2, the smoke enters the volute 31. The motor 32 drives the wind wheel 33 to discharge the rectified smoke to the smoke exhaust pipe 4, and then discharged to the outside; the volute 31 is also made of electrolytic plate material. The volute 31 is made of two left and right volutes 31 that are buckled together as a whole. The volute 31 adopts a spiral line type, the flow resistance of the flow channel inside the volute 31 is small, the exhaust is smooth, and the noise is lower; the heat dissipation blades 34 are arranged between the volute 31 and the motor 32, and the heat dissipation blades 34 are a wheel-shaped structure, which is coaxially arranged with the wind wheel 33 and the motor 32 shaft. The wheel-shaped blades are mainly used to enhance the air disturbance between the motor 32 and the volute 31, accelerate the air circulation, form continuous convection heat exchange during operation, reduce the surface temperature rise of the motor 32 and the volute 31, and extend its service life.

[0040] Embodiment 2:

[0041] A gas water heater comprises an exhaust device as described in Example 1, so that the exhaust of the entire gas water heater is smooth, the noise is low, and the smoke index is easier to control.

[0042] The gas water heater of this embodiment is provided with the above-mentioned exhaust device, and the exhaust noise of the exhaust device is low and the airflow distribution is more uniform. At the same time, the flow channel of the exhaust device is reasonable. After the turbulent flow passes through the smoke exhaust hood 1 and the guide plate 2, the air flow velocity is evenly distributed, the vortex formation is small, and the noise generated is low. The noise of the gas water heater using the above-mentioned exhaust device is reduced by 2 to 4 dB compared with the original gas water heater, and the noise is significantly improved. At the same time, the temperature of the whole machine is low and the reliability is high.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An exhaust device, characterized in that: The invention comprises a smoke exhaust hood (1), a guide plate (2) of a trapezoidal structure, a motor assembly (3) and a smoke exhaust pipe (4); the smoke exhaust hood (1) is provided with a smoke collecting port (11) at one end and a smoke exhaust port (12) at the other end; the guide plate (2) is arranged at the smoke exhaust port (12) and corresponds to the motor assembly (3); the guide plate (2) is provided with a hole (21) for guiding and rectifying flow; the motor assembly (3) is connected to the smoke exhaust pipe (4); the guide plate (2) is used to guide the smoke in the smoke exhaust hood (1). After rectification and flow guidance, the smoke is discharged to the smoke exhaust pipe (4) through the motor assembly (3); the guide plate (2) comprises an upper stepped surface (22), a side surface (23) and a bottom surface (24); the upper stepped surface (22) and the side surface (23) are both provided with the hole (21); the upper stepped surface (22) is connected to the side surface (23) and forms an angle θ (5); the bottom surface (24) is connected to the side surface (23) and is arranged on the smoke exhaust hood (1); the flow channel of the smoke exhaust hood (1) is a streamlined channel.

2. An exhaust device according to claim 1, characterized in that: The area of ​​one or more circular holes (21) is combined to form a ventilation area S1, and the ventilation area S1 is less than or equal to the area S2 of the smoke exhaust port (12).

3. An exhaust device according to claim 2, characterized in that: The diameter d of the hole (21) is 1.5-10 mm.

4. An exhaust device according to claim 3, characterized in that: The area S2 of the smoke exhaust port (12) is greater than or equal to 2826 square millimeters, and the surface area S of the guide plate (2) is greater than the area S2 of the smoke exhaust port (12).

5. An exhaust device according to any one of claims 1 to 4, characterized in that: The angle θ (5) is 95 to 165 degrees.

6. An exhaust device according to claim 5, characterized in that: The height between the upper stepped surface (22) and the bottom surface (24) is 5 to 35 millimeters.

7. An exhaust device according to any one of claims 1 to 4, characterized in that: The motor assembly (3) comprises a volute (31), a motor (32), a wind wheel (33) and heat dissipation blades (34); the wind wheel (33) is connected to the motor (32); the heat dissipation blades (34) are arranged between the volute (31) and the motor (32); the volute (31) is connected to the smoke exhaust hood (1) and corresponds to the guide plate (2).

8. An exhaust device according to claim 7, characterized in that: The volute (31) comprises a left volute and a right volute that can be engaged with each other, and a cross-sectional line of the volute (31) is an Archimedean spiral line.

9. A gas water heater, characterized in that: An exhaust device comprising any one of claims 1-8.

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