Injection molded centrifugal fan blade for air conditioner

Abstract

The utility model provides a kind of injection molding centrifugal fan blade for air conditioner, it is related to ventilation equipment technical field, and it includes: rear disc, the edge at the top of rear disc is fixedly connected with multiple blades in equidistant circle, multiple the one end of blade side is all penetrated and is equipped with multiple through holes, the center of rear disc inside is fixedly embedded with hub, the side of multiple blade top is fixedly connected with front disc.The utility model, the material of rear disc and hub is acrylonitrile-butadiene-styrene copolymer, the material of blade and front disc is polyphenylene sulfide and glass fiber, so design gives consideration to cost, temperature resistance and structural strength;After through hole is opened in blade tail edge, the regular flow of fluid in blade suction surface boundary layer is disturbed by transversely passing airflow, and the periodicity and intensity of vortex shedding are broken, the disturbed vortex shedding becomes irregular, and the intensity is weakened, thereby significantly reduce the discrete frequency noise peak value generated thereby, so design reduces aerodynamic noise.

Description

Technical Field

[0001] This utility model relates to the field of ventilation equipment technology, and in particular to an injection-molded centrifugal fan blade for air conditioning. Background Technology

[0002] Injection-molded centrifugal fan blades are commonly used products in the field of ventilation equipment, especially air conditioning. The fan blades consist of a chassis, a hub, and multiple blades. The outer side of the hub is connected to the inner side of the chassis, and the bottom of the blades is connected to the chassis.

[0003] In the existing technology, it has been found that some injection-molded centrifugal fan blades used in air conditioners cannot simultaneously achieve the desired balance in terms of cost, temperature resistance, and structural strength. In addition, some injection-molded centrifugal fan blades used in air conditioners produce relatively high aerodynamic noise during use. Utility Model Content

[0004] The purpose of this invention is to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an injection-molded centrifugal fan blade for an air conditioner, comprising: a rear disc, wherein multiple blades are fixedly connected in a circular and equidistant manner at the top edge of the rear disc, and multiple through holes are provided at one end of the side of each of the multiple blades, a hub is fixedly embedded in the center of the interior of the rear disc, and a front disc is fixedly connected to one side of the top of each of the multiple blades.

[0006] Furthermore, the surfaces of the rear disc and the wheel hub are provided with multiple material-saving grooves that are equidistantly spaced around the circumference.

[0007] Furthermore, a bushing is fixedly embedded at the center of the top of the hub, and a mounting groove is provided through the top of the bushing.

[0008] Furthermore, the diameter of the multiple through holes is 20%-50% of the thickness of the trailing edge of the multiple blades.

[0009] Furthermore, the spacing between multiple through holes is 2-5 times the hole diameter.

[0010] Furthermore, the multiple through holes are respectively opened in the chord length region 20%-30% behind the trailing edge of the multiple blades.

[0011] Furthermore, the rear disc and wheel hub are made of ABS plastic, while the blades and front disc are made of PPS glass-reinforced plastic.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0013] 1. In this utility model, the rear disc and hub are made of acrylonitrile-butadiene-styrene copolymer, and the blades and front disc are made of polyphenylene sulfide and glass fiber. This design takes into account cost, temperature resistance and structural strength.

[0014] 2. In this utility model, after opening a through hole at the trailing edge of the blade, the periodicity and intensity of vortex shedding are disrupted. The disrupted vortex shedding becomes irregular and the intensity is weakened, thereby significantly reducing the peak value of discrete frequency noise generated therefrom. This design reduces aerodynamic noise. Attached Figure Description

[0015] Figure 1 A schematic diagram of the overall structure of an injection-molded centrifugal fan blade for an air conditioner provided by this utility model;

[0016] Figure 2 A top view of an injection-molded centrifugal fan blade for an air conditioner provided by this utility model;

[0017] Figure 3 A top view of an injection-molded centrifugal fan blade for an air conditioner, provided by this utility model;

[0018] Figure 4 A bottom schematic diagram of an injection-molded centrifugal fan blade for an air conditioner provided by this utility model;

[0019] Figure 5 A schematic diagram of an injection-molded centrifugal fan blade for an air conditioner provided by this utility model.

[0020] Legend:

[0021] 1. Rear disc; 101. Hub; 102. Material saving groove; 103. Bushing; 104. Mounting groove; 105. Blade; 106. Through hole; 107. Front disc. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-5This utility model provides a technical solution: an injection-molded centrifugal fan blade for an air conditioner, comprising: a rear plate 1, a plurality of blades 105 are fixedly connected in a circular and equidistant manner at the top edge of the rear plate 1, a plurality of through holes 106 are provided through one end of the side of each of the plurality of blades 105, a hub 101 is fixedly embedded in the center of the interior of the rear plate 1, and a front plate 107 is fixedly connected to one side of the top of the plurality of blades 105.

[0024] Specifically: the rear disc 1 and hub 101 are made of acrylonitrile-butadiene-styrene copolymer, while the blades 105 and front disc 107 are made of polyphenylene sulfide and fiberglass. This design takes into account cost, temperature resistance and structural strength. After the through hole 106 is opened on the trailing edge of the blade 105, the periodicity and intensity of vortex shedding are disrupted. The disrupted vortex shedding becomes irregular and the intensity is weakened, thereby significantly reducing the peak value of discrete frequency noise generated. This design reduces aerodynamic noise.

[0025] In one embodiment, the surfaces of the rear disc 1 and the hub 101 are provided with a plurality of circumferentially spaced material-saving grooves 102.

[0026] Specifically, such as Figure 1-2 As shown: The opening of the material-saving trough 102 can reduce manufacturing costs without affecting the use of the injection-molded centrifugal fan blades used for air conditioning.

[0027] In one embodiment, a bushing 103 is fixedly embedded at the center of the top of the hub 101, and a mounting groove 104 is provided through the top of the bushing 103.

[0028] Specifically, such as Figure 1-2 As shown: the bushing 103 is made of metal and can be installed on the top of the hub 101 by press fitting; the mounting groove 104 provides installation space for the motor output shaft.

[0029] In one embodiment, the diameter of the plurality of through holes 106 is 20%-50% of the trailing edge thickness of the plurality of blades 105.

[0030] Specifically, such as Figure 5 As shown: When the diameter of the 106 through hole is too large, it may lead to an increase in the leakage of the mainstream airflow, reduce the efficiency and air pressure of the fan, and introduce additional vortex noise such as the noise of airflow separation inside the hole. When the diameter of the 106 through hole is too small, the through airflow is insufficient and the noise reduction effect is not obvious.

[0031] In one embodiment, the spacing between the plurality of through holes 106 is 2-5 times the hole diameter.

[0032] Specifically, such as Figure 5 As shown: if the spacing is too large, it will reduce the continuity of interference with vortex shedding and affect the noise reduction effect; if the spacing is too small, it will weaken the blade strength and may cause noise superposition due to airflow interference.

[0033] In one embodiment, a plurality of through holes 106 are correspondingly opened in the chord length region 20%-30% behind the trailing edge of a plurality of blades 105.

[0034] Specifically, such as Figure 5 As shown: the through hole 106 is opened in the chord length region 20% to 50% behind the trailing edge of the blade 105, which significantly reduces aerodynamic noise. In other locations, the airflow velocity is low, so the opening is not very meaningful and may affect the structural strength.

[0035] In one embodiment, the rear disc 1 and the hub 101 are made of ABS plastic, while the blade 105 and the front disc 107 are made of PPS glass-reinforced plastic.

[0036] Specifically, such as Figure 1-4 As shown: The rear disc 1 and hub 101 are made of acrylonitrile-butadiene-styrene copolymer. The rear disc 1 and hub 101 are non-core load-bearing components and do not usually come into direct contact with high-temperature airflow. Acrylonitrile-butadiene-styrene copolymer is low-cost, easy to process, and has good toughness and impact resistance. The blade 105 and front disc 107 are made of polyphenylene sulfide and glass fiber. The blade 105 is a core load-bearing component and needs to withstand centrifugal force and airflow impact and vibration. The front disc 107 comes into direct contact with high-temperature airflow. Polyphenylene sulfide and glass fiber are resistant to high temperature, have high rigidity, low deformation, and excellent fatigue resistance.

[0037] Working principle: The rear disc 1 and hub 101 are injection molded to the blades 105 and through holes 106 respectively, and then assembled by bonding with high-temperature resistant adhesive. The rear disc 1 and hub 101 are made of acrylonitrile-butadiene-styrene copolymer. The rear disc 1 and hub 101 are non-core load-bearing components and do not usually come into direct contact with high-temperature airflow. Acrylonitrile-butadiene-styrene copolymer is low-cost, easy to process, and has good toughness and impact resistance. The blades 105 and front disc 107 are made of polyphenylene sulfide and glass fiber. The blades 105 are core load-bearing components and need to withstand centrifugal force, airflow impact and vibration. The front disc 107 comes into direct contact with high-temperature airflow. Polyphenylene sulfide and glass fiber are high-temperature resistant, high rigidity, low deformation and excellent fatigue resistance.

[0038] This design balances cost, temperature resistance, and structural strength for the injection-molded centrifugal fan blades used in air conditioning.

[0039] When airflow passes over the trailing edge of blade 105, periodic vortex shedding occurs on the back of blade 105. This regular vortex shedding generates significant discrete frequency noise, which is an important component of the aerodynamic noise of the fan. After the through hole 106 is opened at the trailing edge of blade 105, a portion of the airflow is allowed to flow from the pressure surface of the blade through the through hole 106 to the suction surface. This transverse airflow interferes with the regular flow of the fluid within the boundary layer of the suction surface of blade 105, disrupting the periodicity and intensity of the vortex shedding. The disturbed vortex shedding becomes irregular and its intensity weakens, thereby significantly reducing the peak value of the discrete frequency noise generated therefrom.

[0040] This design reduces aerodynamic noise in the injection-molded centrifugal airflow used in air conditioning.

[0041] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An injection-molded centrifugal fan blade for air conditioning, characterized in that, include: The rear disc (1) has multiple blades (105) fixedly connected at equal intervals around the top edge of the rear disc (1). Multiple through holes (106) are opened through one end of the side of each blade (105). A hub (101) is fixedly embedded in the center of the interior of the rear disc (1). A front disc (107) is fixedly connected to one side of the top of each blade (105). The diameter of the multiple through holes (106) is 20%-50% of the thickness of the trailing edge of the multiple blades (105); The rear disc (1) and hub (101) are made of ABS plastic, and the blade (105) and front disc (107) are made of PPS glass-reinforced plastic.

2. The injection-molded centrifugal fan blade for air conditioning according to claim 1, characterized in that: The surfaces of the rear disc (1) and the hub (101) are provided with multiple material-saving grooves (102) that are circumferentially equidistant.

3. The injection-molded centrifugal fan blade for air conditioning according to claim 1, characterized in that: A bushing (103) is fixedly embedded at the center of the top of the hub (101), and a mounting groove (104) is provided through the top of the bushing (103).

4. The injection-molded centrifugal fan blade for air conditioning according to claim 1, characterized in that: The spacing between multiple through holes (106) is 2-5 times the hole diameter.

5. The injection-molded centrifugal fan blade for air conditioning according to claim 1, characterized in that: The multiple through holes (106) are respectively opened in the chord length region 20%-30% behind the trailing edge of the multiple blades (105).

Images