An impeller control device and design method for a low-noise air conditioning cooling system

Abstract

An impeller control device of a low-noise air conditioning cooling system and a design method thereof, comprising a motor, a drive shaft, an impeller, a main bearing, an air bearing, and a mounting bracket, wherein the motor is fixedly mounted on the mounting bracket through a bolt mounting structure, the motor drives the drive shaft to rotate, and the drive shaft is rotatably mounted on the mounting bracket through a parallel main bearing and an air bearing, one end of the drive shaft extends out of the mounting bracket and a cross-flow impeller is fixedly mounted at its end, an air bearing brake structure is arranged on the mounting bracket, the air bearing brake structure comprises a guide column, a brake disc, and a compression spring, a plurality of guide columns extending axially are installed on one side of the mounting bracket adjacent to the air bearing, a brake disc is slidably mounted on the guide column, a compression spring is arranged between the brake disc and the mounting bracket, the brake disc is installed between the air bearing and the impeller, and a ventilation hole is arranged on the end wall of the impeller on the side close to the brake disc. At the same time, a brake disc wind force adjustable structure is installed on the drive shaft to achieve accurate noise suppression.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning devices, and in particular to an impeller control device of a low-noise air conditioning cooling system and a design method thereof. Background Art

[0002] In the prior art, there is a technical solution for reducing the noise of air conditioner impellers by using air bearings. At the same time, in order to improve the control method of the air volume of air conditioner cross-flow impellers, cross-flow impellers with variable blade angles have appeared. However, in the prior art, there is still little research on how to match the adjustable impeller with the braking of the air bearing brake structure when adjusting. For example, when the impeller rotates at a low speed, the air bearing does not form an airflow support at this time, but if the impeller blade angle is adjusted to increase the impeller wind force, it will cause ineffective braking of the brake disc, but increase the sliding friction noise between the drive shaft and the inner ring of the air bearing; on the contrary, when the impeller rotates at a high speed, the brake disc brakes the inner ring of the air bearing under the push of the airflow. If the impeller blade angle is adjusted to reduce the wind force, the brake of the brake disc will be accidentally released at this time, causing the brake structure to fail.

[0003] Therefore, it is necessary to design an impeller control device for a low-noise air conditioning cooling system to achieve matching of the adjustable impeller with the braking of the air bearing braking structure during adjustment, thereby accurately suppressing the noise. Summary of the invention

[0004] The object of the present invention is to provide an impeller control device of a low-noise air-conditioning cooling system and a design method thereof, so as to solve the technical problems in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An impeller control device for a low-noise air-conditioning cooling system comprises a motor, a drive shaft, an impeller, a main bearing, an air bearing and a mounting bracket, wherein the motor is fixedly mounted on the mounting bracket via a bolt mounting structure, the motor drives the drive shaft to rotate, and the drive shaft is rotatably mounted on the mounting bracket via a parallel main bearing and an air bearing, one end of the drive shaft extends out of the mounting bracket and a cross-flow impeller is fixedly mounted on the end thereof, an air bearing braking structure is arranged on the mounting bracket, the air bearing braking structure comprises a guide column, a brake disc and a compression spring, a plurality of axially extending guide columns are mounted on a side of the mounting bracket adjacent to the air bearing, a brake disc is slidably mounted on the guide column, a compression spring is arranged between the brake disc and the mounting bracket, the brake disc is mounted between the air bearing and the impeller, and a ventilation hole is arranged on the end wall of the impeller on the side close to the brake disc.

[0007] Preferably, the impeller is a cross-flow impeller with a variable blade angle; it includes fixed blades, movable blades, and a dual-axis motor fixedly mounted on the end of the drive shaft, a pulley is fixedly mounted on the output shaft of the dual-axis motor away from one end of the drive shaft, a plurality of pull ropes are wound around the pulley, one end of the pull rope is wound around the pulley, and the other end is connected to the corresponding movable blade.

[0008] Preferably, the impeller is provided with an adjustable braking wind force structure.

[0009] Preferably, the adjustable braking wind force structure includes an adjusting gear, the dual-shaft motor is installed at the end position of the driving shaft extending into the impeller, and the adjusting gear is installed on the output shaft of the dual-shaft motor close to the driving shaft.

[0010] Preferably, a plurality of shielding plates are hingedly mounted on the end of the drive shaft extending into the impeller, and the positions of the shielding plates correspond one-to-one to the positions of the ventilation holes on the end wall of the impeller.

[0011] Preferably, a driving tooth is provided at the hinged position of the shielding plate, and the driving tooth is meshed with the adjusting gear.

[0012] Preferably, the brake disc comprises a circular disc body and a brake sleeve, the brake sleeve is arranged in the middle of the circular disc body, and the end of the brake sleeve is positioned opposite to the end face of one end of the inner ring of the air bearing.

[0013] Preferably, one side of the circular disk body faces one side of the impeller.

[0014] Preferably, the ventilation hole faces the circular disc body of the brake disc.

[0015] A design method for an impeller control device of a low-noise air conditioning cooling system mainly includes the following steps:

[0016] Step 1: Obtain the air conditioner motor parameters, drive shaft parameters, and impeller parameters to select the air bearing;

[0017] Step 2: Establish a fluid-solid coupling model of the air bearing rotation for the selected air bearing, and obtain the speed range for the air bearing to establish the air flow support;

[0018] Step 3: According to the speed range in step 2, a fluid-solid coupling model of the airflow in the ventilation hole during the rotation of the impeller is established to obtain the parameters of the compression spring required for the brake disc and the structural parameters of the ventilation hole on the impeller end wall;

[0019] Step 4: According to the structural parameters of the ventilation holes, the airflow-solid coupling model under different shielding areas of the ventilation holes is established to obtain the wind force required to achieve the target brake disc movement;

[0020] Step 5: According to the wind force required under different shielding areas obtained in step 4, match and design the rotation angle of the movable blades, and the transmission ratio of the driving teeth and the adjusting gear.

[0021] The beneficial effects of the present invention are:

[0022] The cross-flow impeller with variable blade angle is designed to match the brake structure of the impeller air bearing. By setting a dual-axis motor, when the dual-axis motor rotates to adjust the movable blade to increase the angle and increase the air volume, the dual-axis motor synchronously drives the baffle to rotate to partially block the ventilation hole, reducing the air volume passing through the ventilation hole, that is, reducing the thrust on the brake disc; when the dual-axis motor rotates to adjust the movable blade to reduce the angle and reduce the air volume, the dual-axis motor synchronously drives the rotation to reduce the blocking of the ventilation hole, increase the ventilation area of ​​the ventilation hole, and thus increase the thrust on the brake disc. This solves the problem of matching the brake of the air bearing brake structure when the adjustable impeller is adjusted, and achieves accurate suppression of noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the bearing support state when the impeller of the present invention rotates at a low speed;

[0024] Figure 2 It is a schematic diagram of the variable blade structure of the impeller of the present invention;

[0025] Figure 3 It is a schematic diagram of the bearing support state when the impeller of the present invention rotates at high speed;

[0026] Figure 4 This is a schematic diagram of the wind force adjustable structure of the impeller brake disc of the present invention. Figure 1 ;

[0027] Figure 5 This is a schematic diagram of the wind force adjustable structure of the impeller brake disc of the present invention. Figure 2 . DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0029] like Figure 1-5 The structure diagram of the impeller control device of the low-noise air conditioning cooling system of the present invention is shown. It includes a motor 1, a drive shaft 2, an impeller 3, a main bearing 4, an air bearing 5, and a mounting bracket 6. The motor 1 is fixedly mounted on the mounting bracket 6 (not shown) through a bolt mounting structure, and the motor 1 drives the drive shaft 2 to rotate, and the drive shaft 2 is rotatably mounted on the mounting bracket 6 through the parallel main bearing 4 and the air bearing 5. One end of the drive shaft 2 extends out of the mounting bracket 6 and a cross-flow impeller 3 is fixedly mounted on the end thereof. The motor 1 drives the impeller 3 to rotate at different speeds to achieve different air volumes of air conditioning cooling air.

[0030] like Figure 1 and 3 The figures respectively show the bearing support status of the drive shaft 2 under low speed and high speed rotation conditions. Figure 1 The figure shows the condition of low-speed rotation. At this time, due to the low rotation speed of the drive shaft 2, an air flow bearing layer is formed between the air bearing 5 and the drive shaft 2. At the same time, due to the bending of the drive shaft 2, the outer surface of the drive shaft 2 contacts the inner ring of the air bearing 5, that is, the inner ring of the air bearing 5 rotates with the drive shaft 2. At this time, due to the low rotation speed of the drive shaft 2, the rolling noise caused by the rotation of the inner ring of the air bearing 5 is low. When the rotation speed gradually increases, due to the structure of the air bearing 5 itself, a stable air flow bearing layer is formed between the inner ring of the air bearing 5 and the outer surface of the drive shaft 2. At this time, the air bearing 5 is formed between the drive shaft 2 and the air bearing 5. Figure 3 The supporting state shown, that is, the inner ring of the air bearing 5 is out of contact with the outer ring of the drive shaft 5, which greatly reduces the noise caused by the rotation of the inner ring. However, due to the low rolling resistance design of the air bearing 5 itself and the influence of dust accumulation during long-term use, sometimes even if air flow support is formed under high-speed conditions, the inner ring of the air bearing 5 will still be driven to rotate with the drive shaft 2, which increases the rolling noise during high-speed rotation and reduces the use effect of the air bearing 5.

[0031] To this end, the present invention provides an air bearing braking structure under high-speed conditions. Figure 1-3 As shown, a plurality of guide pillars 9 extending axially are installed on one side of the mounting bracket 6 adjacent to the air bearing 5. A brake disc 7 is slidably mounted on the guide pillar 9, and a compression spring 8 is arranged between the brake disc 7 and the mounting bracket 6. The brake disc 7 is installed between the air bearing 5 and the impeller 3. The brake disc 7 includes a circular disc body 71 and a brake sleeve 72, and the brake sleeve 72 is arranged in the middle of the circular disc body 71, and the position of the end of the brake sleeve 72 is directly opposite to the end face of one end of the inner ring of the air bearing 5. One side of the circular disc body 71 is directly opposite to one side of the impeller 3, and a ventilation hole H is arranged on the end wall 31 of the impeller 3 on the side close to the brake disc 7. The ventilation hole H is directly opposite to the circular disc body 71 of the brake disc 7. When the impeller 3 rotates at a low speed, the brake disc 7 is pushed away from the air bearing 5 by the compression spring 8, so that the brake sleeve 72 does not contact the inner ring of the air bearing 5, and the brake disc 7 is in the release position P1; when the speed increases, the wind force increases, and the airflow W flowing from the inside of the cross-flow impeller 3 through the ventilation hole H increases, and the airflow W pushes the brake disc 7 to move toward the air bearing 5. Finally, the brake sleeve 72 contacts the inner ring of the air bearing 5, so that the inner ring of the air bearing 5 will not rotate with the drive shaft 2, thereby eliminating the unstable noise of the air bearing 5, and the brake disc 7 is in the braking position P2.

[0032] In particular, the present invention is mainly directed to a cross-flow impeller with a variable blade angle. The existence of a cross-flow impeller with a variable blade angle is mainly to increase the adjustment range and adjustment method of the air volume of the air conditioner. For example, when the impeller rotates stably at a certain speed, in order to further adjust the air volume based on the speed, a structure that can adjust the impeller blade angle is set inside the impeller, so that the size of the impeller wind force can be adjusted by adjusting the blade angle.

[0033] like Figure 2 , 4 -5 shows the structure for adjusting the blade angle of the present invention. It includes fixed blades 32 and movable blades 33 on the impeller 3, a dual-axis motor 10 fixedly mounted on the end of the drive shaft 2, a rope pulley 11 fixedly mounted on the output shaft of the dual-axis motor 10 away from one end of the drive shaft 2, and a plurality of pull ropes 12 are wound around the rope pulley 11, one end of the pull rope 12 is wound around the rope pulley, and the other end is connected to the corresponding movable blade 33. The movable blade 33 is mounted on the end wall 31 of the impeller 3 through a rotating shaft 331 with a torsion spring. The dual-axis motor 10 is controlled to rotate to drive the rope pulley 11 to rotate a certain angle, thereby realizing the adjustment of the angle of the movable blade 33.

[0034] At this point, the main technical problem to be solved by the present invention is how to match the braking of the air bearing brake structure when the adjustable impeller is adjusted to achieve accurate noise suppression. When the impeller 3 rotates at a low speed, the air bearing 5 does not form an airflow support. However, if the blade angle of the impeller 3 is adjusted to increase the wind force of the impeller, the ineffective braking of the brake disc 7 will be caused, which will increase the sliding friction noise between the drive shaft 2 and the inner ring of the air bearing 5. On the contrary, when the impeller 3 rotates at a high speed, the brake disc 7 brakes the inner ring of the air bearing 5 under the push of the airflow. If the blade angle of the impeller 3 is adjusted to reduce the wind force, the brake of the brake disc 7 will be accidentally released, causing the brake structure to fail. For this reason, the present invention is provided with an adjustable braking wind force structure to solve the above technical problems.

[0035] like Figure 2 , 4 -5 shows the specific structure of the adjustable wind force braking structure of the present invention. Figure 2 As shown, although the dual-axis motor 10 is installed at the end position where the drive shaft 2 extends into the impeller 3, the output shaft of the dual-axis motor 10 close to the drive shaft 2 is fixedly installed with an adjustment gear 14, that is, the adjustment gear 14 is rotatably installed at the end of the drive shaft 2. At the same time, a plurality of shielding plates 13 are hingedly installed at the end of the drive shaft 2 extending into the impeller 3, and the positions of the shielding plates 13 correspond to the positions of the ventilation holes H on the end wall 31 of the impeller 3. The hinged position of the shielding plate 13 is provided with a driving tooth 131, and the driving tooth 131 is meshed with the adjustment gear 14. When the dual-axis motor 10 rotates to adjust the movable blade 33 to increase the angle and increase the air volume, the dual-axis motor 10 synchronously drives the shielding plate 13 to rotate to partially block the ventilation hole H, thereby reducing the air volume passing through the ventilation hole H, that is, reducing the thrust on the brake disc 7; when the dual-axis motor 10 rotates to adjust the movable blade 33 to reduce the angle and reduce the air volume, the dual-axis motor 10 synchronously drives 13 to rotate to reduce the blocking of the ventilation hole H, increase the ventilation area of ​​the ventilation hole H, and thus increase the thrust on the brake disc 7. This solves the problem of matching the brake of the air bearing brake structure when the adjustable impeller is adjusted.

[0036] In order to meet the design efficiency of the above-mentioned adjustable brake wind force structure for different air conditioning parameters, the present invention also designs a design method for the impeller control device of the corresponding low-noise air conditioning cooling system, which mainly includes the following steps:

[0037] Step 1: Obtain the air conditioner motor parameters, drive shaft parameters, and impeller parameters to select the air bearing;

[0038] Step 2: Establish a fluid-solid coupling model of the air bearing rotation for the selected air bearing, and obtain the speed range for the air bearing to establish the air flow support;

[0039] Step 3: According to the speed range in step 2, a fluid-solid coupling model of the airflow in the ventilation hole during the rotation of the impeller is established to obtain the parameters of the compression spring required for the brake disc and the structural parameters of the ventilation hole on the impeller end wall;

[0040] Step 4: According to the structural parameters of the ventilation holes, the airflow-solid coupling model under different shielding areas of the ventilation holes is established to obtain the wind force required to achieve the target brake disc movement;

[0041] Step 5: According to the wind force required under different shielding areas obtained in step 4, match and design the rotation angle of the movable blades, and the transmission ratio of the driving teeth and the adjusting gear.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0046] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An impeller control device for a low-noise air conditioning cooling system, comprising a motor, a drive shaft, an impeller, a main bearing, an air bearing, and a mounting bracket, wherein the motor is fixedly mounted on the mounting bracket through a bolt mounting structure, the motor drives the drive shaft to rotate, and the drive shaft is rotatably mounted on the mounting bracket through a parallel main bearing and an air bearing, one end of the drive shaft extends out of the mounting bracket and a cross-flow impeller is fixedly mounted at the end thereof, characterized in that: An air bearing brake structure is arranged on the mounting bracket, and the air bearing brake structure includes a guide column, a brake disc, and a compression spring. A plurality of guide columns extending axially are arranged on one side of the mounting bracket close to the air bearing, a brake disc is slidably mounted on the guide column, a compression spring is arranged between the brake disc and the mounting bracket, the brake disc is installed between the air bearing and the impeller, and a ventilation hole is arranged on the end wall of the impeller on the side close to the brake disc; The impeller is a cross-flow impeller with a variable blade angle; it includes fixed blades, movable blades, and a dual-shaft motor fixedly mounted on the end of the drive shaft. A pulley is fixedly mounted on the output shaft of the dual-shaft motor away from one end of the drive shaft, and a plurality of pull ropes are wound around the pulley, one end of the pull rope is wound around the pulley, and the other end is connected to the corresponding movable blade; The impeller is provided with a brake wind force adjustable structure; The adjustable brake wind force structure includes an adjusting gear, a double-shaft motor is installed at the end position where the drive shaft extends into the impeller, and the adjusting gear is installed on the output shaft of the double-shaft motor close to the drive shaft; A plurality of shielding plates are hingedly installed at the end of the drive shaft extending into the impeller, and the positions of the shielding plates correspond one to one with the positions of the ventilation holes on the end wall of the impeller; A driving tooth is provided at the hinged position of the shielding plate, and the driving tooth is meshed with the adjusting gear; The brake disc includes a circular disc body and a brake sleeve, wherein the brake sleeve is arranged in the middle of the circular disc body, and the end of the brake sleeve is positioned directly opposite to the end surface of one end of the inner ring of the air bearing; One side of the circular disk body faces the side of the impeller; The ventilation hole faces the circular disc body of the brake disc.

2. A method for designing an impeller control device of a low-noise air conditioning cooling system as claimed in claim 1, comprising the following steps: Step 1: Obtain the air conditioner motor parameters, drive shaft parameters, and impeller parameters to select the air bearing; Step 2: Establish a fluid-solid coupling model of the air bearing rotation for the selected air bearing, and obtain the speed range for the air bearing to establish the air flow support; Step 3: According to the speed range in step 2, a fluid-solid coupling model of the airflow in the ventilation hole during the rotation of the impeller is established to obtain the parameters of the compression spring required for the brake disc and the structural parameters of the ventilation hole on the impeller end wall; Step 4: According to the structural parameters of the ventilation holes, the airflow-solid coupling model under different shielding areas of the ventilation holes is established to obtain the wind force required to achieve the target brake disc movement; Step 5: According to the wind force required under different shielding areas obtained in step 4, match and design the rotation angle of the movable blades, and the transmission ratio of the driving teeth and the adjusting gear.

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