A noise reduction mechanism at the air inlet of a high-pressure fan for a blow molding machine

Abstract

The utility model discloses a noise reduction mechanism at the air inlet of a high-pressure blower for a blow molding machine, comprising a casing (1), wherein an air control cylinder (2) is arranged inside the casing (1), wherein the air control cylinder (2) is rotatably connected inside the casing (1), wherein the air control cylinder (2) comprises an air inlet portion (2.1), an air control portion (2.2) and an air supply portion (2.3), wherein the air inlet portion (2.1) and the air supply portion (2.3) are respectively arranged at two ends of the air control portion (2.2), wherein the air supply portion (2.3) is connected to an air inlet (3.1) of a blower (3), wherein an air control blade (2.4) arranged in a spiral shape is arranged on the inner wall of the air control portion (2.2), wherein the rotation direction of the air control cylinder (2) is the same as the rotation direction of blades (3.2) in the blower (3). The utility model discloses a noise reduction mechanism at the air inlet of a high-pressure blower for a blow molding machine, wherein the air flow of the high-pressure blower can be turned more naturally, thereby reducing the noise of the blower.

Description

Technical Field

[0001] The utility model belongs to the field of noise reduction equipment, and particularly relates to a noise reduction mechanism at an air inlet of a high-pressure fan for a blow molding machine. Background Art

[0002] The automobile air conditioning duct is an important component of the automobile air conditioning system. It is connected to the outlet of the automobile air conditioning and mainly plays the role of guiding the air, so that the heated or cooled air formed in the automobile air conditioning is introduced into the cab. In the prior art, the automobile air conditioning duct is usually made by blow molding. Specifically, low-density polyethylene raw materials, recycled materials, foaming agents, masterbatches, etc. are mixed and stirred evenly in a certain proportion, and then input into the blow molding machine screw through a feeder, and then the molten resin is extruded into a tubular blank through the blow molding machine die head and die. When the tubular blank encounters air, the pressure suddenly decreases, and the blank quickly foams to form a foamed blank. Finally, the blank is formed into an outlet duct in the mold. But the problem is that the high-pressure fan used in the blow molding machine will generate relatively large noise. The usual practice is to install ordinary noise reducers at the air inlet and outlet of the fan, but this method will reduce the air circulation to a certain extent. In order to meet the air circulation standard, the fan needs to output a higher power, which will waste a lot of energy. Alternatively, a soundproof cover can be added to the outside of the overall fan, but this method will cause the fan to occupy a larger area, and the fan in the soundproof cover is also prone to substandard air circulation. Utility Model Content

[0003] In view of the above-mentioned shortcomings, the utility model proposes a noise reduction mechanism at the air inlet of a high-pressure fan for a blow molding machine, which can make the airflow of the high-pressure fan turn more naturally, thereby reducing the noise of the fan.

[0004] The technical solution adopted by the utility model to solve the above-mentioned problem is: a noise reduction mechanism at the air inlet of a high-pressure fan for a blow molding machine, comprising a casing, an air control cylinder is arranged inside the casing, the air control cylinder is rotatably connected in the casing, the air control cylinder comprises an air inlet part, an air control part and an air supply part, the air inlet part and the air supply part are respectively arranged at two ends of the air control part, the air supply part is communicated with the air inlet of the fan, a spirally arranged air control sheet is arranged on the inner wall of the air control part, and the rotation direction of the air control cylinder is the same as the rotation direction of the blades in the fan.

[0005] Compared with the prior art, the utility model has the following advantages: during the rotation of the blades in the high-pressure fan for the blow molding machine, the gas in the fan will be discharged from the exhaust port, and negative air pressure will be generated inside the fan, and air will be drawn in from the external environment. Without the participation of the utility model, the air will directly enter the fan in the axial direction of the rotating shaft of the blade, and then driven by the blades, the airflow entering the fan will rotate with the blades and then be discharged from the exhaust port. In this process, when the air enters the fan, the airflow is prone to generate a cyclone and the airflow will collide with the inside of the fan. This causes a lot of energy consumption and noise. The faster the blades rotate in this process, the greater the energy consumption and the noise. Then, driven by the blades, the airflow follows the rotation direction of the blades, which is equivalent to the blades hitting the air in the rotation direction of the blades to flow and the fluidity of the wind pressure drives the air on the sides of the blades to flow. This process is also prone to noise. After the utility model is involved, the air will first pass through the wind control part. In the wind control part, the air close to the inner wall of the wind control part will move along the wind control sheet, so that this part of the air forms a An external cyclone, driven by which the air that has not come into contact with the wind control blades will slowly form an airflow that advances in a cyclonic manner. When the airflow that advances in this manner enters the fan, the airflow will not directly impact the blades in the fan, reducing the energy consumption of the impact and the noise. It also reduces the relative speed of the blades hitting the airflow, giving the airflow in the fan a rate-progressive rotation mode, which also effectively reduces the noise. In terms of airflow stability, compared with the airflow in the axial direction inside the fan, because the airflow itself keeps rotating In this way, it is not easy to form an airflow collision phenomenon, thereby reducing the probability of airflow entering the fan to form a cyclone, and also achieving the purpose of reducing noise; during the use of the utility model, the air control cylinder can achieve the purpose of noise reduction even if it does not rotate, and the noise reduction effect is better during the rotation of the air control cylinder, but the air supply efficiency of the fan formed by the air control cylinder itself due to its own rotation cannot be higher than the exhaust efficiency of the fan, otherwise the air induction effect of the fan itself will lose its meaning, although the noise reduction effect still exists, but the energy consumption is too high, and the airflow inside the fan will become unstable.

[0006] As an improvement, ball grooves are provided at both ends of the casing, and balls are provided in the ball grooves. The casing and the air control cylinder are rotatably connected via the balls. Through the improvement, the design of the balls between the casing and the air control cylinder can make the air control cylinder rotate more smoothly relative to the casing, and while ensuring the stability of the airflow in the air control cylinder, the ball groove should not be designed on the air control cylinder.

[0007] As an improvement, a transmission tooth is provided on the outer wall of the wind control part, and the wind control cylinder is connected to the motor through the transmission tooth and the transmission chain. Through the improvement, the rotation of the wind control cylinder is realized.

[0008] As an improvement, the outside of the motor is covered with a soundproof cover. Through the improvement, the motor will also generate certain noise during operation, but compared with covering the fan itself to reduce the noise, it is easier to achieve the purpose of noise reduction by dispersing the noise to the motor and then reducing the noise of the motor.

[0009] As an improvement, a bracket is provided at the bottom of the casing, the motor is fixed on the bracket, and a shock absorber is provided at the lower end of the bracket. Through the improvement, a certain vibration will be generated during the rotation of the motor and the air control cylinder. Through the design of the shock absorber, the noise reduction machine can be damped.

[0010] As an improvement, the air supply part is in a frustum shape, and the diameter of the air supply part decreases from the air control part toward the air inlet of the fan. The slope of the air supply part is equal to the slope of the air inlet of the fan. Through the improvement, the airflow in the air control tube can be delivered into the fan more smoothly. At the same time, the diameter of the air control part is larger than the diameter of the air inlet of the fan, which has a smaller impact on the air induction effect of the fan, thereby ensuring the air induction effect of the fan and the air supply effect of the air control tube on the fan, so that during the rotation of the fan, the control of the airflow is smoother and the noise reduction effect is better.

[0011] As an improvement, an air supply sheet is provided on the inner wall of the air supply section, and the air supply sheet is connected to the air control sheet along the spiral direction of the air control sheet. Through the improvement, the airflow on the inner wall of the air control tube maintains the effect of vortex air supply. When the airflow flows from the air control section to the air supply section, because the connection between the air control section and the air supply section is bent, it is easy to affect the stability of the airflow, and then affect the stability of the airflow entering the fan. The design of the air supply sheet can reduce this stability and ensure the stability of the airflow.

[0012] As an improvement, the inner diameter of the cross section of the wind control sheet is larger than the maximum diameter of the fan's air inlet, and the inner diameter of the cross section of the air supply sheet is larger than the maximum diameter of the fan's air inlet. Through the improvement, although both the wind control sheet and the air supply sheet can guide the airflow, if the inner diameters of the two cross sections are smaller than the maximum diameter of the fan's air inlet, it will still affect the fan's air intake volume, which is not conducive to the operation of the fan. The purpose of the noise reduction machine is to reduce noise, but it cannot solve the problem of noise reduction while greatly affecting the operation of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the sectional structure of the overall structure of the utility model.

[0014] As shown in the figure: 1. Casing, 1.1. Ball groove, 1.2. Ball, 2. Air control tube, 2.1. Air inlet part, 2.2. Air control part, 2.3. Air supply part, 2.4. Air control plate, 2.5. Transmission gear, 2.6. Air supply plate, 3. Fan, 3.1. Air inlet, 3.2. Blade, 4. Transmission chain, 5. Motor, 6. Sound insulation cover, 7. Bracket, 8. Shock absorber. DETAILED DESCRIPTION

[0015] The embodiments of the present utility model are further described below in conjunction with the accompanying drawings.

[0016] like Figure 1 As shown, a noise reduction mechanism at the air inlet of a high-pressure blower for a blow molding machine comprises a casing 1, an air control cylinder 2 is arranged inside the casing 1, the air control cylinder 2 is rotatably connected in the casing 1, the air control cylinder 2 comprises an air inlet portion 2.1, an air control portion 2.2 and an air supply portion 2.3, the air inlet portion 2.1 and the air supply portion 2.3 are respectively arranged at two ends of the air control portion 2.2, the air supply portion 2.3 is connected to the air inlet 3.1 of the blower 3, a spirally arranged air control blade 2.4 is arranged on the inner wall of the air control portion 2.2, and the rotation direction of the air control cylinder 2 is the same as the rotation direction of the blade 3.2 in the blower 3.

[0017] Ball grooves 1.1 are provided at both ends of the casing 1, and balls 1.2 are provided in the ball grooves 1.1. The casing 1 and the air control tube 2 are rotatably connected through the balls 1.2. Transmission teeth 2.5 are provided on the outer wall of the air control part 2.2. The air control tube 2 is transmission-connected to the motor 5 through the transmission teeth 2.5 and the transmission chain 4. The outer side of the motor 5 is covered with a soundproof cover 6. A bracket 7 is provided at the bottom of the casing 1, and the motor 5 is fixed on the bracket 7. A shock absorber 8 is provided at the lower end of the bracket 7. The design of the ball between the casing and the air control tube can make the air control tube rotate more smoothly relative to the casing. When ensuring the stability of the airflow in the air control tube, the design of the ball groove should not be provided on the air control tube. In addition, the motor will also generate certain noise during operation, but compared with the noise reduction of the fan itself, it is easier to achieve the purpose of noise reduction by dispersing the noise to the motor and then reducing the noise of the motor.

[0018] The air supply part 2.3 is in a truncated cone shape, and the diameter of the air supply part 2.3 decreases from the air control part 2.2 toward the air inlet 3.1 of the fan 3. The slope of the air supply part 2.3 is equal to the slope of the air inlet 3.1 of the fan 3. An air supply piece 2.6 is arranged on the inner wall of the air supply part 2.3, and the air supply piece 2.6 is connected to the air control piece 2.4 along the spiral direction of the air control piece 2.4. The inner diameter of the cross section of the air control piece 2.4 is larger than the maximum diameter of the air inlet 3.1 of the fan 3, and the inner diameter of the cross section of the air supply piece 2.6 is larger than the maximum diameter of the air inlet 3.1 of the fan 3. The airflow in the air control cylinder is more smoothly delivered to the fan, and at the same time, the diameter of the air control part is larger than the diameter of the air inlet of the fan, which has a smaller impact on the air induction effect of the fan, that is, the air induction effect of the fan is guaranteed, and the air supply effect of the air control cylinder on the fan is guaranteed, so that the airflow control is smoother during the rotation of the fan, and the noise reduction effect is better.

[0019] The above description is only for the best embodiment of the utility model, but it cannot be understood as a limitation of the claims. The utility model is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the protection scope of the independent claims of the utility model are within the protection scope of the utility model.

Claims

1. A noise reduction mechanism at the air inlet of a high-pressure blower for a blow molding machine, characterized in that: The invention comprises a casing (1), wherein an air control cylinder (2) is arranged inside the casing (1), wherein the air control cylinder (2) is rotatably connected inside the casing (1), wherein the air control cylinder (2) comprises an air inlet portion (2.1), an air control portion (2.2) and an air supply portion (2.3), wherein the air inlet portion (2.1) and the air supply portion (2.3) are arranged at two ends of the air control portion (2.2) respectively, wherein the air supply portion (2.3) is connected to an air inlet (3.1) of a fan (3), wherein an air control blade (2.4) arranged in a spiral shape is arranged on the inner wall of the air control portion (2.2), and the rotation direction of the air control cylinder (2) is the same as the rotation direction of blades (3.2) in the fan (3).

2. According to claim 1, a noise reduction mechanism at the air inlet of a high-pressure blower for a blow molding machine is characterized in that: Ball grooves (1.1) are provided at both ends of the housing (1), balls (1.2) are provided in the ball grooves (1.1), and the housing (1) and the air control cylinder (2) are rotatably connected via the balls (1.2).

3. According to claim 1, a noise reduction mechanism at the air inlet of a high-pressure blower for a blow molding machine is characterized in that: The outer wall of the wind control part (2.2) is provided with a transmission tooth (2.5), and the wind control cylinder (2) is connected to the motor (5) through the transmission tooth (2.5) and the transmission chain (4).

4. The noise reduction mechanism at the air inlet of a high-pressure blower for a blow molding machine according to claim 3, characterized in that: The outer side of the motor (5) is covered with a sound insulation cover (6).

5. The noise reduction mechanism at the air inlet of a high-pressure blower for a blow molding machine according to claim 3, characterized in that: A bracket (7) is provided at the bottom of the housing (1), the motor (5) is fixed on the bracket (7), and a shock absorber (8) is provided at the lower end of the bracket (7).

6. The noise reduction mechanism at the air inlet of a high-pressure blower for a blow molding machine according to claim 1, characterized in that: The air supply portion (2.3) is in a truncated cone shape, the diameter of the air supply portion (2.3) decreases from the air control portion (2.2) toward the air inlet (3.1) of the fan (3), and the slope of the air supply portion (2.3) is equal to the slope of the air inlet (3.1) of the fan (3).

7. The noise reduction mechanism at the air inlet of a high-pressure blower for a blow molding machine according to claim 6, characterized in that: An air supply plate (2.6) is provided on the inner wall of the air supply portion (2.3), and the air supply plate (2.6) is connected to the air control plate (2.4) along the spiral direction of the air control plate (2.4).

8. The noise reduction mechanism at the air inlet of a high-pressure blower for a blow molding machine according to claim 7, characterized in that: The inner diameter of the cross section of the air control piece (2.4) is greater than the maximum diameter of the air inlet (3.1) of the fan (3), and the inner diameter of the cross section of the air supply piece (2.6) is greater than the maximum diameter of the air inlet (3.1) of the fan (3).

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