Fan for gas water heater

Abstract

The utility model discloses a fan for a gas water heater. The fan comprises an exhaust fume collecting hood, a mounting component, an impeller, a volute and a motor, the impeller is assembled in the volute, one side of the impeller is assembled at an air outlet formed in the exhaust fume collecting hood, and the other side of the impeller is connected with the motor through a mounting assembly; the impeller and the motor are connected through the mounting assembly, so that stable rotation transmission between the impeller and the motor is ensured, and mechanical noise generated during high-speed operation of the motor is prevented; and the volute is assembled outside the impeller, so that the effect of reducing noise is achieved, and the noise generated when the fan runs is reduced.

Description

Technical Field

[0001] The utility model relates to the field of construction and installation devices, in particular to a fan for a gas water heater. Background Art

[0002] At present, some gas water heaters on the market have a high operating noise. The water heater noise mainly comes from fan noise, combustion noise and heat exchanger water flow noise, and the fan operation noise often accounts for a high proportion. Fan noise includes aerodynamic noise and mechanical noise. Aerodynamic noise is composed of two parts: periodic exhaust noise and eddy noise. When the fan impeller operates under certain pressure conditions, it periodically squeezes the gas and collides with gas molecules, causing the gas around the impeller to produce velocity and pressure pulsations, and radiates to the impeller in the form of sound waves, which produces periodic exhaust noise. While the impeller is running at high speed, a large number of gas vortices will form on its surface. When these gas vortices separate on the impeller interface, eddy noise is generated. Mechanical noise mainly comes from the loose assembly of the bearing and the impeller, which causes the impeller to run unbalanced.

[0003] The prior art discloses a smoke exhaust structure for a gas water heater, including a motor, a bracket assembly, an impeller, a volute assembly, and a smoke hood, wherein the impeller is arranged in the volute assembly, the motor is fixed to the volute assembly through the bracket assembly, and the rotating shaft of the motor is connected to the impeller; the air inlet of the volute assembly is connected to the air outlet of the smoke hood; a guide plate is arranged inside the smoke hood, and the guide plate divides the interior of the smoke hood into a first smoke channel and a second smoke channel along the direction of the smoke. The above device arranges the guide plate so that the wind pressure values ​​of the two smoke channels at each position on the same horizontal plane are the same, and the amount of air flowing through the combustion system of the gas water heater is relatively consistent, so as to achieve the effect of improving the combustion condition of the combustion system, and the protrusion of the front plate of the smoke hood can prevent the formation of air vortexes inside the smoke hood, increase the air flow rate, and reduce noise; but when the motor drives the impeller to rotate at a high speed, the connection thereof shakes, generating mechanical noise, thereby affecting the user's experience. Utility Model Content

[0004] The utility model provides a low-noise gas water heater fan with reasonable design, simple structure and low running noise.

[0005] The technical solution of the utility model is as follows: a fan for a gas water heater, comprising a smoke hood, a mounting assembly, an impeller, a volute and a motor; the impeller is assembled in the volute, one side of the impeller is assembled at an air outlet provided in the smoke hood, and the other side of the impeller is connected to the motor through the mounting assembly; the smoke hood comprises a front plate and a rear plate; a first connecting plate and a second connecting plate which are connected in sequence are provided between the front plate and the rear plate.

[0006] Preferably, the front plate, the rear plate, the first connecting plate and the second connecting plate are connected to form a smoke collecting chamber, the lower opening of the smoke collecting chamber is an air inlet, and the air outlet is opened on the side of the second connecting plate.

[0007] Preferably, both the front plate and the rear plate are provided with an annular reinforcement structure, and the convex surface of the reinforcement structure faces the inner side of the smoke collecting cavity.

[0008] Preferably, the second connecting plate comprises a first curved plate, a second curved plate, a third curved plate and a fourth curved plate which are smoothly connected in sequence; a first transition curved surface is provided at the connection between the first curved plate and the second curved plate, and a second transition curved surface is provided at the connection between the third curved plate and the fourth curved plate.

[0009] Preferably, the impeller includes a first fixed plate, a second fixed plate and a plurality of impeller blades; the plurality of impeller blades are assembled between the first fixed plate and the second fixed plate, the second fixed plate is provided with vortex elimination holes for eliminating vortex; the first fixed plate is installed at the air outlet.

[0010] Preferably, an impeller center hole is provided at the center of the second fixed plate, and at least two vortex-eliminating holes are provided, and the at least two vortex-eliminating holes are circumferentially arranged with the impeller center hole as the center.

[0011] Preferably, the vortex elimination hole is in a trapezoidal shape, with the narrow end of the trapezoid facing the central hole of the impeller.

[0012] Preferably, the mounting assembly includes a sleeve, a pressing plate and a nut; the impeller is assembled on the motor shaft provided by the motor through the impeller center hole, the sleeve is assembled between the motor and the second fixed plate, and the pressing plate passes through the motor shaft and is assembled between the nut and the second fixed plate.

[0013] Preferably, the sleeve is provided with a sleeve center hole and multiple bosses, the multiple bosses are arranged circumferentially around the sleeve center hole, the second fixed plate has multiple sleeve mounting holes arranged circumferentially around the impeller center hole, and the multiple bosses are engaged with the multiple sleeve mounting holes.

[0014] Preferably, the pressing piece is provided with a special-shaped center hole and multiple boss grooves, the multiple boss grooves are arranged circumferentially with the special-shaped center hole as the center, and the multiple bosses pass through multiple sleeve mounting holes and are nested in the multiple boss grooves; the special-shaped center hole and the front end of the motor shaft are provided with a special-shaped threaded shaft to match.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] A fan for a gas water heater, wherein an impeller and a motor are connected via a mounting assembly to ensure stable rotation transmission between the two and prevent the motor from emitting mechanical noise when running at high speed; a volute is mounted outside the impeller to reduce noise and reduce the noise during operation of the fan.

[0017] Furthermore, the front plate and the rear plate are connected by the first connecting plate and the second connecting plate, which can increase the structural strength of the smoke collecting hood. At the same time, the first connecting plate and the second connecting plate can more effectively guide the oil smoke into the smoke collecting chamber. The air inlet is arranged below the smoke collecting chamber and staggered with the air outlet, which can ensure smooth air discharge, reduce the generation of vortex, prevent the fan volute from vibrating and generating noise, and thus reduce noise.

[0018] Furthermore, the reinforced structure enhances the structural strength of the front and rear panels, disperses and withstands the pressure generated by the fan and oil smoke, prevents the panel surface from deformation or damage, and thus improves the durability and stability of the entire smoke hood.

[0019] Furthermore, the multiple arc plates enable the smoke hood to collect and guide the oil smoke more effectively. Each arc plate is smoothly connected to avoid sharp corners or uneven transitions, which helps to reduce the adhesion of oil smoke on the side panels and the generation of vortices; allowing it to enter the smoke collection chamber more smoothly, thereby improving the smoke collection efficiency; the first transition curved surface and the second transition curved surface enhance the continuity and smoothness of the structure, and optimize the flow characteristics of the oil smoke, thereby improving the smoke collection effect and the stability of the entire device; and disperse the stress distribution of the first connecting plate and the second connecting plate when subjected to force, thereby improving the bearing capacity of the overall structure.

[0020] Furthermore, the fan impeller is assembled in a volute connected to the motor, which ensures that the impeller can rotate stably and efficiently under the drive of the motor. The design of the volute helps to guide the airflow and reduce noise; the first fixing plate and the second fixing plate enable the impeller to remain stable during rotation and not easily deformed or damaged; by opening the vortex elimination hole on the second fixing plate, the formation of vortex can be effectively destroyed, thereby reducing noise and improving the performance of the fan.

[0021] Furthermore, the design of multiple vortex elimination holes can also help increase the ventilation area of ​​the impeller, improve the smoothness of the airflow through the impeller, reduce the airflow resistance, thereby further reducing noise and improving the efficiency of the fan. The vortex elimination holes are arranged circumferentially with the center hole of the impeller as the center. It can eliminate vortices more effectively; the trapezoidal design makes the vortex elimination holes gradually narrow in the direction toward the center hole of the impeller, which helps to better guide the airflow, reduce the sudden changes of the airflow at the orifice, and reduce the generation of noise; the design of the narrow end of the trapezoid facing the center hole of the impeller is conducive to guiding the airflow to the central area and enhancing the flow effect of the airflow in the central area. This can improve the wind collection capacity of the fan impeller, make the airflow more evenly distributed on the entire impeller, and improve the overall performance of the fan.

[0022] Furthermore, when the fan impeller is working, the rotation of the motor drives the pressing plate to rotate, thereby transmitting the transmission force to the sleeve, and then driving the impeller to rotate through the sleeve, dispersing the transmission force directly applied to the center hole of the impeller, avoiding the impeller friction noise caused by long-term use and wear, and making the fan impeller run more stably, effectively reducing the exhaust noise.

[0023] Furthermore, the center hole of the sleeve on the sleeve is its core part, which not only provides a positioning reference for the entire sleeve, but also ensures the coaxiality when assembled with other components. This design ensures that the relative positions of the components are stable when the fan is running, and reduces the vibration and noise caused by eccentricity or misalignment. The setting of multiple bosses further enhances the structural strength and stability of the sleeve. These bosses are arranged circumferentially with the center hole of the sleeve as the center. This layout not only ensures uniform force on the sleeve, but also enables it to maintain dynamic balance during rotation, reducing vibration caused by imbalance. The boss and the center hole of the sleeve realize fast and accurate assembly between the sleeve and the second fixed plate, simplify the assembly process, and ensure the stability and reliability of the fan during operation.

[0024] Furthermore, the special-shaped center hole can ensure precise matching with the special-shaped threaded shaft at the front end of the motor shaft, preventing possible rotation deviation or shaking of the fan during operation, and providing a stable connection; the press-fitting sheet is also provided with a plurality of boss grooves, which are arranged circumferentially with the special-shaped center hole as the center. This layout enables the boss groove to match the boss on the sleeve, and the plurality of bosses can be precisely nested in the boss groove by passing through the sleeve mounting hole. This nested structure not only provides additional support and fixing, but also enhances the overall stability of the internal components of the fan.

[0025] Other features and advantages of the present invention will be disclosed in detail in the following specific implementations and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The utility model is further described below in conjunction with the accompanying drawings:

[0027] Figure 1 This is a schematic diagram of the installation of a fan for a gas water heater of the utility model;

[0028] Figure 2 The structure of the smoke hood in the first embodiment of the utility model is shown in FIG. Figure 1 ;

[0029] Figure 3 The structure of the smoke hood in the first embodiment of the utility model is shown in FIG. Figure 2 ;

[0030] Figure 4 This is a schematic diagram of the structure of the impeller in the second embodiment of the utility model;

[0031] Figure 5 This is a schematic diagram of the structure of the shaft sleeve in the installation assembly in the third embodiment of the present utility model;

[0032] Figure 6 This is a schematic diagram of the structure of the motor in the third embodiment of the present utility model;

[0033] Figure 7 This is a schematic diagram of the structure of the pressing piece in the installation assembly in the third embodiment of the present utility model;

[0034] The following are the descriptions of the reference numerals:

[0035] Smoke hood 1, mounting assembly 2, impeller 3, volute 4, motor 5, front plate 1-1, rear plate 1-2, first connecting plate 1-3, second connecting plate 1-4, air inlet 1-5, air outlet 1-6, reinforcement structure 1-7, locking bracket 1-8, long arc notch 1-9, first arc plate 1-4-1, second arc plate 1-4-2, third arc plate 1-4-3, fourth arc plate 1-4-4, first transition curved surface 1-4-5, second transition curved surface 1-4-6, first transition curved surface 1-4-7, first transition curved surface 1-4-8, first transition curved surface 1-4-9, first transition curved surface 1-4-1, second transition curved surface ... Curved surface 1-4-6, first fixing plate 3-1, second fixing plate 3-2, impeller blade 3-3, vortex elimination hole 3-2-1, impeller center hole 3-2-2, sleeve mounting hole 3-2-3, sleeve 2-1, pressing plate 2-2, nut 2-3, motor shaft 5-1, special-shaped threaded shaft 5-1-1, rear end non-threaded shaft 5-1-2, sleeve center hole 2-1-1, boss 2-1-2, special-shaped center hole 2-2-1, boss groove 2-2-2. DETAILED DESCRIPTION

[0036] The following is an explanation and description of the technical scheme of the embodiment of the utility model in conjunction with the drawings of the embodiment of the utility model, but the following embodiment is only a preferred embodiment of the utility model, not all. Based on the embodiment in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the utility model.

[0037] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction. Therefore, it should not be understood as a limitation on the present invention.

[0038] like Figure 1As shown, a fan for a gas water heater includes a smoke hood 1, a mounting assembly 2, an impeller 3, a volute 4, and a motor 5; the impeller 3 is assembled in the volute 4, one side of the impeller 3 is assembled at the air outlet 1-6 provided in the smoke hood 1, and the other side of the impeller 3 is connected to the motor 5 through the mounting assembly 2; it is assembled between the motor 5 and the smoke hood 1.

[0039] Embodiment 1:

[0040] like Figures 2 to 3 As shown, the smoke collecting hood 1 includes a front plate 1-1 and a rear plate 1-2; an arc-shaped side plate assembly for connection is provided between the front plate 1-1 and the rear plate 1-2, and the arc-shaped side plate assembly includes a first connecting plate 1-3 and a second connecting plate 1-4; the arc-shaped side plate assembly increases the structural strength of the smoke collecting hood, wherein the arc shape more effectively guides the oil smoke into the smoke collecting chamber, and the smoke collecting chamber is formed by connecting the front plate 1-1, the rear plate 1-2 and the arc-shaped side plate assembly. When the stove generates oil smoke, the oil smoke will be effectively sucked in and concentrated in the smoke collecting chamber to prevent it from spreading to the surroundings. Dispersion; an air inlet 1-5 is provided on the lower side of the smoke collecting chamber to allow oil smoke to enter the smoke collecting chamber so as to better collect the oil smoke; an air outlet 1-6 is provided on the arc-shaped side panel assembly which is connected with the smoke collecting chamber, and the air outlet 1-6 ensures that the oil smoke is effectively discharged and will not remain in the smoke collecting hood; the air inlet 1-5 and the air outlet 1-6 are staggered to ensure smooth exhaust and reduce the generation of vortex, prevent the fan volute from vibrating and generating large noise, and reduce noise; and effectively collect and discharge the oil smoke generated by the stove to keep the air in the kitchen fresh.

[0041] Furthermore, when the air inlet 1-5 is provided, the lower sides of the first connecting plate 1-3 and the first arc-shaped plate 1-4-1 are provided with long arc-shaped notches 1-9, and the symmetrically distributed long arc-shaped notches 1-9 are also used for air intake. When the fan smoke hood is assembled, the air inlet 1-5 is at the bottom of the entire device, and the area of ​​the air inlet can be increased, thereby allowing more oil smoke to enter the smoke chamber. A circular air outlet 1-6 is provided in the middle of the third arc-shaped plate 1-4-3. The circular air outlet 1-6 provides a stable and efficient exhaust effect, ensuring that the oil smoke is evenly distributed in the smoke chamber, avoiding excessive accumulation or poor exhaust on one side, reducing the generation of vortices, and reducing the noise generated by the device.

[0042] Among them, the front plate 1-1 and the rear plate 1-2 are both provided with a reinforcement structure 1-7. In this embodiment, the reinforcement structure 1-7 is in the shape of a groove. The reinforcement structure 1-7 is arranged in a ring on the front plate 1-1 and the rear plate 1-2. The ring-arranged reinforcement structure 1-7 realizes uniform pressure distribution and smoke flow control, and strengthens the structural strength and stability of the front plate 1-1 and the rear plate 1-2; the convex surface of the groove faces the inner side of the smoke collection cavity, and the reinforcement structure 1-7 more effectively guides or controls the flow of smoke. The convex surface helps to enhance the smoke collection effect, making the smoke easier to be inhaled and discharged.

[0043] Furthermore, the arcuate side panel assembly is formed by sequentially splicing a first connecting plate 1-3 and a second connecting plate 1-4, and the opening formed by the first connecting plate 1-3 and the second connecting plate 1-4 is the above-mentioned air inlet 1-5, so that it can more effectively collect the generated oil smoke; wherein, the second connecting plate 1-4 is composed of a plurality of arcuate side panels and transition surfaces connecting the arcuate side panels, and the plurality of arcuate side panels include a first arcuate plate 1-4-1, a second arcuate plate 1-4-2, a third arcuate plate 1-4-3, a third arcuate plate 1-4-3 and a fourth arcuate plate 1-4-4 which are smoothly connected in sequence; a first transition surface 1-4-5 is provided at the connection between the first arcuate plate 1-4-1 and the second arcuate plate 1-4-2, and a second transition surface 1-4-6 is provided at the connection between the third arcuate plate 1-4-3 and the third arcuate plate 1-4-3; the design of the above-mentioned multi-section arcuate side panels allows more flexible adaptation to the shape of the smoke collecting chamber, thereby more effectively collecting and guiding the oil smoke. The transition surfaces are smoothly connected to avoid sharp corners or uneven transitions, which helps to reduce the adhesion of oil smoke on the side panels and the generation of vortices.

[0044] Among them, the first transition curved surface 1-4-5 is smoothly connected with the first curved plate 1-4-1 and the second curved plate 1-4-2 respectively, and the second transition curved surface 1-4-6 is smoothly connected with the third curved plate 1-4-3 and the fourth curved plate 1-4-4 respectively. The smooth connection of the curved surfaces enhances the structural strength and stability of the curved side panel assembly, making the appearance of the curved side panel assembly more smooth and coordinated, which is in line with the design style of the entire smoke hood.

[0045] Furthermore, the curvature of the first transition surface 1-4-5 and the second transition surface 1-4-6 is greater than the curvature of the first curved plate 1-4-1, the second curved plate 1-4-2, the third curved plate 1-4-3, the third curved plate 1-4-3 and the fourth curved plate 1-4-4; the larger curvature can enhance the structural strength of the transition surface, and the surface with a larger curvature can better disperse and withstand stress when subjected to external force, thereby reducing deformation or damage caused by stress concentration.

[0046] The arc-shaped side panel assembly is provided with a plurality of locking brackets 1-8 for fixing the fan smoke hood, and the locking brackets 1-8 also have a certain load-bearing capacity and can support the weight of the smoke hood and its accessories. This helps to reduce the stress concentration caused by uneven weight distribution and further improves the structural stability of the smoke hood.

[0047] Embodiment 2

[0048] like Figure 4 As shown, the impeller 3 includes a first fixing plate 3-1, a second fixing plate 3-2 and a plurality of impeller blades 3-3; the plurality of impeller blades 3-3 are assembled between the first fixing plate 3-1 and the second fixing plate 3-2 to form a complete impeller 3, and the first fixing plate 3-1 and the second fixing plate 3-2 enable the impeller blades 3-3 to remain stable during rotation and not easily deformed or damaged. The second fixing plate 3-2 is provided with a vortex elimination hole 3-2-1 for eliminating vortexes, and the vortex elimination hole 3-2-1 effectively destroys the formation of vortexes, thereby reducing noise and improving the performance of the fan.

[0049] The center of the second fixing plate 3-2 is provided with an impeller center hole 3-2-2, which allows the motor shaft 5-1 of the motor to pass through, thereby connecting with the motor 5 to ensure that the impeller 3 can rotate smoothly and continuously. At the same time, the impeller center hole 3-2-2 also plays a supporting and positioning role to ensure the stability and reliability of the entire impeller 3.

[0050] Furthermore, a plurality of vortex elimination holes 3-2-1 are provided, and these vortex elimination holes 3-2-1 are arranged circumferentially with the impeller center hole 3-2-2 as the center, and the circumferentially arranged vortex elimination holes 3-2-1 can eliminate vortices more effectively. The circumferential arrangement can ensure that the effect of the vortex elimination holes 3-2-1 is evenly distributed on the entire impeller, further improving the effect of eliminating vortices. The design of multiple vortex elimination holes 3-2-1 also helps to increase the ventilation area of ​​the fan impeller, improve the smoothness of the airflow through the impeller blades 3-3, and reduce the airflow resistance, thereby further reducing noise and improving the efficiency of the fan.

[0051] The vortex elimination hole 3-2-1 is in a trapezoidal shape, and the narrow end of the trapezoid faces the central hole 3-2-2 of the impeller, so that the vortex elimination hole 3-2-1 gradually narrows in the direction toward the central hole 3-2-2 of the impeller, which helps to better guide the airflow, reduce the sudden change of the airflow at the hole, and reduce the noise. The trapezoidal structure can also effectively disperse the vortex energy, avoid the vortex from being too concentrated in a local area, and further reduce the impact of the vortex on the performance of the fan.

[0052] Furthermore, the trapezoidal corners of the vortex elimination hole 3-2-1 are arc-shaped, and the arc-shaped corners can effectively reduce the impact and turbulence of the airflow when passing through the vortex elimination hole 3-2-1. Compared with sharp corners, arc-shaped corners are smoother, and the airflow can transition more smoothly when passing through, thereby reducing the generation of noise and energy loss; it also enhances the structural strength of the vortex elimination hole 3-2-1. When the fan impeller rotates at high speed, the airflow will produce a large impact force and vibration on the vortex elimination hole 3-2-1. The arc-shaped corners can better disperse these forces and reduce stress concentration, thereby improving the durability and service life of the entire device.

[0053] The shape of several impeller blades 3-3 is a curved surface, and they are fixed between the first fixing plate 3-1 and the second fixing plate 3-2 at equal intervals by screws; the curved impeller blades 3-3 can better adapt to the flow characteristics of the airflow. During the operation of the fan, when the airflow passes through the impeller blades 3-3, the curved surface shape can guide the airflow to flow more smoothly, reducing the separation of the airflow and the generation of vortices. This design can reduce energy loss and improve the efficiency of the fan. Fixing with screws is not only simple and reliable, but also convenient for maintenance and replacement. The screw connection has high strength and stability, which can ensure that the impeller blades will not loosen or fall off when rotating at high speed. At the same time, if the impeller blades need to be replaced or repaired, it can be easily completed by removing the screws, which improves the maintainability of the equipment.

[0054] Embodiment 3

[0055] like Figures 5 to 7 As shown, the mounting assembly 2 is used to connect the impeller 3 with the motor 5 installed in the volute 4; the mounting assembly 2 includes a sleeve 2-1, a pressing piece 2-2 and a nut 2-3; the impeller 3 is assembled in the volute 4, and the volute 4 is used to protect the internal impeller 3 to ensure stable operation, help guide the airflow, increase the air volume and air pressure, and also help reduce noise.

[0056] Furthermore, the motor 5 is connected to the volute 4 by screws, and the screw connection provides a simple and effective fixing method, which is convenient for subsequent disassembly, maintenance and replacement of parts.

[0057] The motor 5 is provided with a motor shaft 5-1 connected to the impeller 3. The sleeve 2-1 passes through the motor shaft 5-1 and is assembled between the motor 5 and the impeller 3, playing a role of connection and support. The sleeve 2-1 ensures the smooth operation of the impeller 3, reduces the friction between the motor shaft 5-1 and the impeller 3, and prolongs the service life. The pressing piece 2-2 passes through the motor shaft 5-1 and is assembled between the nut 2-3 and the impeller 3. The pressing piece 2-2 plays a role of fixing and pressing, so that the impeller 3 can be firmly installed on the motor shaft 5-1 to prevent loosening or falling off during operation.

[0058] Furthermore, the nut 2-3 is used in conjunction with the compression piece 2-2. By tightening the nut 2-3, the compression piece 2-2 can generate sufficient compression force on the impeller 3 to ensure its stable operation. The nut 2-3 is also easy to disassemble and repair, which improves the flexibility of the entire installation assembly.

[0059] The motor shaft 5-1 includes a special-shaped threaded shaft 5-1-1 and a rear-end non-threaded shaft 5-1-2; the center of the pressing piece 2-2 is provided with a special-shaped center hole 2-2-1 that matches the special-shaped threaded shaft 5-1-1. The shape of the special-shaped threaded shaft 5-1-1 makes the motor shaft 5-1 and the pressing piece 2-2 more stable during assembly, and less likely to slide or deflect, thereby improving the accuracy and reliability of assembly. In this embodiment, the shape of the special-shaped threaded shaft 5-1-1 and the special-shaped center hole 2-2-1 is D-shaped, which can make the connection more stable and less likely to rotate compared to the traditional cylindrical shape.

[0060] The rear end non-threaded shaft 5-1-2 is to simplify the structure and reduce the manufacturing cost. The center of the shaft sleeve 2-1 is provided with a shaft sleeve center hole 2-1-1, and the shaft sleeve 2-1 is nested on the rear end non-threaded shaft 5-1-2 through the shaft sleeve center hole 2-1-1. The shaft sleeve 2-1 is tightly combined with the motor shaft 5-1, providing the necessary support and fixing function, which helps to disperse and reduce the vibration and impact generated during the operation of the motor, thereby improving the stability and service life of the motor.

[0061] The sleeve 2-1 and the impeller 3 are assembled on the motor shaft 5-1 through the sleeve center hole 2-1-1 and the special-shaped center hole 2-2-1 respectively, and the inner diameter of the special-shaped center hole 2-2-1 is larger than the diameter of the motor shaft 5-1. During the assembly process, the impeller 3 can be more easily inserted into the motor shaft 5-1, reducing the resistance and difficulty during assembly. This not only improves the assembly efficiency, but also reduces the risk of damage that may occur during the assembly process.

[0062] Furthermore, the assembly between the sleeve 2-1 and the impeller 3 is achieved by matching the boss 2-1-2 and the sleeve mounting hole 3-2-3, thereby ensuring the stability and functionality of the mechanical parts, ensuring the firmness of the installation of the sleeve 2-1 and the impeller 3, and making the assembly process of the impeller 3 more precise and convenient; a plurality of bosses 2-1-2 are provided on the sleeve 2-1, and the plurality of bosses 2-1-2 are arranged circumferentially with the sleeve center hole 2-1-1 as the center; a special-shaped center hole 2-2-1 is provided at the center of the impeller 3, and the impeller 3 has a plurality of sleeve mounting holes 3-2-3 arranged circumferentially with the special-shaped center hole 2-2-1 as the center, and the size and position of the plurality of bosses 2-1-2 correspond to the size and position of the plurality of sleeve mounting holes 3-2-3.

[0063] Among them, the multiple bosses 2-1-2 arranged circumferentially make the sleeve 2-1 more uniform and stable in structure. The presence of the boss 2-1-2 increases the surface area of ​​the sleeve 2-1, thereby improving the heat dissipation performance of the sleeve 2-1, which helps to reduce the temperature when the motor is running. The provision of multiple sleeve mounting holes 3-2-3 makes the assembly process of the impeller 3 more precise and convenient. Each sleeve mounting hole 3-2-3 can be accurately matched with the sleeve 2-1, thereby ensuring a tight connection between the impeller 3 and the motor shaft 5-1. The assembly error is reduced, the assembly quality is improved, and the overall performance of the fan is improved.

[0064] The pressing piece 2-2 is used to fix the impeller 3 on the motor shaft 5-1. The pressing piece 2-2 is assembled on the motor shaft 5-1 through the special-shaped center hole 2-2-1. The pressing piece 2-2 is provided with a plurality of boss grooves 2-2-2 arranged circumferentially with the special-shaped center hole 2-2-1 as the center. The size and position of the plurality of boss grooves 2-2-2 correspond to the size and position of the plurality of bosses 2-1-2. Among them, the plurality of bosses 2-1-2 pass through the plurality of sleeve mounting holes 3-2-3 and are nested in the plurality of boss grooves 2-2-2. The precise fit between the pressing piece 2-2 and the sleeve 2-1 is ensured. Since the size and position of the boss groove 2-2-2 completely correspond to the size and position of the boss 2-1-2, the pressing piece 2-2 can be accurately sleeved on the sleeve 2-1 to achieve stable fixation and connection. This precise fit not only improves the efficiency and accuracy of assembly, but also avoids performance problems or safety hazards caused by improper assembly.

[0065] The following are the steps to install the water heater fan impeller:

[0066] S1, the motor 5 and the volute 4 are pre-assembled by screws;

[0067] S2, the sleeve 2-1 is nested 3-1 on the rear end non-threaded shaft 5-1-2 of the motor shaft 5-1 through the sleeve center hole;

[0068] S3, the impeller 3 passes through the special-shaped center hole 2-2-1 and the motor shaft 5-1, and the corresponding sleeve mounting hole 3-2-3 on the impeller 3 fits with the boss 2-1-2 on the sleeve 2-1;

[0069] S4, the special-shaped center hole 2-2-1 on the pressing piece is nested with the special-shaped threaded shaft 5-1-1 of the motor shaft 5-1 in the shape of a D-type, and the boss groove 2-2-2 on the pressing piece 2-2 is nested with the boss 2-1-2 on the sleeve 2-1;

[0070] S5, the nut 2-3 is rotationally connected with the thread of the motor shaft 5-1.

[0071] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Those skilled in the art should understand that the utility model includes but is not limited to the contents described in the drawings and the above specific implementation. Any modification that does not deviate from the functional and structural principles of the utility model will be included in the scope of the claims.

Claims

1. A fan for a gas water heater, characterized in that: The invention comprises a smoke collecting hood (1), a mounting assembly (2), an impeller (3), a volute (4) and a motor (5); the impeller (3) is mounted in the volute (4), one side of the impeller (3) is mounted at an air outlet (1-6) provided in the smoke collecting hood (1), and the other side of the impeller (3) is connected to the motor (5) via the mounting assembly (2); the smoke collecting hood (1) comprises a front plate (1-1) and a rear plate (1-2); a first connecting plate (1-3) and a second connecting plate (1-4) which are connected in sequence are provided between the front plate (1-1) and the rear plate (1-2); the impeller (3) The invention comprises a first fixing plate (3-1), a second fixing plate (3-2) and a plurality of impeller blades (3-3); the plurality of impeller blades (3-3) are assembled between the first fixing plate (3-1) and the second fixing plate (3-2); the second fixing plate (3-2) is provided with a vortex elimination hole (3-2-1) for eliminating vortex; the first fixing plate (3-1) is installed at an air outlet (1-6); an impeller center hole (3-2-2) is provided at the center of the second fixing plate (3-2); at least two vortex elimination holes (3-2-1) are provided, and at least two vortex elimination holes (3-2-1) are arranged circumferentially with the impeller center hole (3-2-2) as the center; the vortex elimination hole (3-2-1) is in the shape of a trapezoid, with the narrow end of the trapezoid facing the impeller center hole (3-2-2).

2. A fan for a gas water heater according to claim 1, characterized in that: The front plate (1-1), the rear plate (1-2), the first connecting plate (1-3) and the second connecting plate (1-4) are connected to form a smoke collecting chamber, the lower opening of the smoke collecting chamber is an air inlet (1-5), and the air outlet (1-6) is opened on the side of the second connecting plate (1-4).

3. A fan for a gas water heater according to claim 2, characterized in that: The front plate (1-1) and the rear plate (1-2) are both provided with a reinforcing structure (1-7) arranged in an annular manner, and the convex surface of the reinforcing structure (1-7) faces the inner side of the smoke collecting cavity.

4. A fan for a gas water heater according to claim 1, characterized in that: The second connecting plate (1-4) comprises a first curved plate (1-4-1), a second curved plate (1-4-2), a third curved plate (1-4-3) and a fourth curved plate (1-4-4) which are smoothly connected in sequence; a first transition curved surface (1-4-5) is provided at the connection between the first curved plate (1-4-1) and the second curved plate (1-4-2), and a second transition curved surface (1-4-6) is provided at the connection between the third curved plate (1-4-3) and the fourth curved plate (1-4-4).

5. A fan for a gas water heater according to claim 1, characterized in that: The mounting assembly (2) comprises a shaft sleeve (2-1), a pressing piece (2-2) and a nut (2-3); the impeller (3) is assembled on a motor shaft (5-1) provided in the motor (5) through an impeller center hole (3-2-2); the shaft sleeve (2-1) is assembled between the motor (5) and a second fixing plate (3-2); and the pressing piece (2-2) passes through the motor shaft (5-1) and is assembled between the nut (2-3) and the second fixing plate (3-2).

6. A fan for a gas water heater according to claim 5, characterized in that: The shaft sleeve (2-1) is provided with a shaft sleeve center hole (2-1-1) and a plurality of bosses (2-1-2), the plurality of bosses (2-1-2) being arranged circumferentially with the shaft sleeve center hole (2-1-1) as the center, the second fixing plate (3-2) is provided with a plurality of shaft sleeve mounting holes (3-2-3) being arranged circumferentially with the impeller center hole (3-2-2) as the center, the plurality of bosses (2-1-2) being engaged with the plurality of shaft sleeve mounting holes (3-2-3).

7. A fan for a gas water heater according to claim 5, characterized in that: The pressing sheet (2-2) is provided with a special-shaped center hole (2-2-1) and a plurality of boss grooves (2-2-2); the plurality of boss grooves (2-2-2) are arranged circumferentially with the special-shaped center hole (2-2-1) as the center; the plurality of bosses (2-1-2) pass through the plurality of shaft sleeve mounting holes (3-2-3) and are nested in the plurality of boss grooves (2-2-2); the special-shaped center hole (2-2-1) is matched with a special-shaped threaded shaft (5-1-1) provided at the front end of the motor shaft (5-1).

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