Belt pulley transmission mechanism and air conditioning system

Abstract

The utility model relates to the technical field of refrigeration equipment, in particular to a belt pulley transmission mechanism and an air conditioning system. The belt pulley transmission mechanism comprises a driving wheel, a driven wheel and a transmission belt; the driving wheel is connected with a driving motor, the driven wheel is connected with fan blades, and the transmission belt is in transmission connection with the driving wheel and the driven wheel; the driving wheel is provided with a first charging belt pulley, and / or the driven wheel is provided with a second charging belt pulley, and the first charging belt pulley and the second charging belt pulley generate preset radial size changes when internal fluid pressure changes due to charging or discharging of fluid, so that adjustment of the transmission ratio of the driving wheel and the driven wheel is realized; therefore, the rotation speed of the fan blades of the fixed-frequency unit is adjusted. According to the belt pulley transmission mechanism, the transmission structure is simplified, transmission ratio adjustment can be achieved, and then fan blade rotating speed adjustment of a fixed-frequency unit is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and in particular to a pulley transmission mechanism and an air conditioning system. Background Art

[0002] At present, the axial flow fans of most air-conditioning systems use a pulley drive method to drive the fan blades to rotate. The pulley drive mechanism has the characteristics of simple structure, fast transmission speed, and durability. However, since the diameters of the driving wheel and the driven wheel of this pulley drive mechanism are fixed, that is, the transmission ratio is fixed, if you want to adjust the fan blade speed, you can only do so by adjusting the speed of the driving wheel, which is not possible with a fixed-frequency unit. The relevant technology provides a transmission system with an adjustable transmission ratio, including a gear set composed of multiple gears. The transmission ratio is adjusted by adjusting the meshing of different gears to achieve the speed adjustment of the fan blades, but the structure of the transmission system is relatively complex. Utility Model Content

[0003] The present application provides a pulley transmission mechanism and an air conditioning system, wherein the transmission mechanism simplifies the transmission structure, can achieve transmission ratio adjustment, and further achieve blade speed adjustment of a fixed-frequency unit.

[0004] In a first aspect, the present application provides a pulley transmission mechanism, comprising:

[0005] A driving wheel, used for connecting with a driving motor;

[0006] A driven wheel, used to connect the fan blades;

[0007] A transmission belt, drivingly connecting the driving wheel and the driven wheel;

[0008] The driving wheel is provided with a first fluid-filled pulley, and / or the driven wheel is provided with a second fluid-filled pulley, and the first fluid-filled pulley and the second fluid-filled pulley generate a preset radial size change when the internal fluid pressure changes.

[0009] In some embodiments, a belt tensioning assembly is further included, the belt tensioning assembly comprising:

[0010] A tensioning wheel, used for rotating and fitting the transmission belt;

[0011] The lifting drive mechanism is fixedly connected to the axle of the tensioning wheel and is used to drive the tensioning wheel to move up and down to tension the transmission belt.

[0012] In some embodiments, the driven wheel comprises:

[0013] The driven wheel body has a first air charging channel axially formed therein and a second air charging channel radially formed therein which is connected to the first air charging channel. The second air charging pulley is sleeved on the driven wheel body, and the second air charging channel is sealedly connected to the charging port of the second air charging pulley.

[0014] A driven limiting plate is connected to both axial sides of the driven wheel body and is used to limit the second current charging pulley, and the fan blade is connected to the driven limiting plate;

[0015] The driven air-inflating pipe is fixedly connected to the driven wheel body and is used to support the driven wheel body. The driven air-inflating pipe is communicated with the first air-inflating passage.

[0016] In some embodiments, a plurality of second inflation channels are evenly opened along the radial direction of the driven wheel body, and the charging port of the second inflation pulley is arranged in one-to-one correspondence with the second inflation channels.

[0017] In some embodiments, the driving wheel comprises:

[0018] A driving wheel body, wherein the first side is used to connect to the output shaft of the driving motor, the driving wheel body is provided with a third air charging channel in the axial direction thereof and is connected to the second side thereof, the driving wheel body is provided with a fourth air charging channel in the radial direction thereof and is connected to the third air charging channel, the first charging pulley is sleeved on the driving wheel body, and the fourth air charging channel is sealedly connected to the charging port of the first charging pulley;

[0019] An active limiting plate, connected to both axial sides of the driving wheel body, for limiting the first charging pulley;

[0020] An active inflation pipe is connected to the second axial side of the driving wheel body, and the active inflation pipe is communicated with the third inflation channel.

[0021] In some embodiments, a plurality of fourth charging channels are evenly arranged along the radial direction of the driving wheel body, and the charging ports of the first charging pulley are arranged in one-to-one correspondence with the fourth charging channels.

[0022] In some embodiments, the first inflation pulley is connected to a first inflation component, and the first inflation component is provided with a first inflation valve; the second inflation pulley is connected to a second inflation component, and the second inflation component is provided with a second inflation valve.

[0023] In some embodiments, a controller and a temperature sensor are further included, wherein the temperature sensor, the first inflation valve and the second inflation valve are all connected to the controller;

[0024] The temperature sensor is used to detect the ambient temperature, the controller is used to control the opening and closing of the first inflation valve according to the ambient temperature to control the inflation and deflation of the first inflation pulley, and the controller is used to control the opening and closing of the second inflation valve to control the inflation and deflation of the second inflation pulley.

[0025] In a second aspect, the present application provides an air conditioning system comprising any of the above-mentioned pulley transmission mechanisms.

[0026] In some embodiments, the air conditioning system includes an outdoor unit and an indoor unit, the outdoor unit includes a fan assembly, and the pulley transmission mechanism is connected between a driving motor and a fan blade of the fan assembly.

[0027] In a third aspect, the present application provides a control method, the control method comprising:

[0028] Detect the ambient temperature and obtain the fan blade speed according to the ambient temperature;

[0029] The set transmission ratio of the pulley transmission mechanism is calculated based on the rotation speed of the fan blade and the rotation speed of the driving motor;

[0030] The first flow-charging pulley and / or the second flow-charging pulley are charged or discharged with fluid to adjust the transmission ratio of the driving pulley and the driven pulley to reach the set transmission ratio.

[0031] In some embodiments, the step of charging or discharging fluid from the first flow-charging pulley and / or the second flow-charging pulley to adjust the transmission ratio of the driving pulley and the driven pulley to reach the set transmission ratio comprises:

[0032] One of the first charging pulley and the second charging pulley is controlled to be inflated, and the other is controlled to be deflated.

[0033] In some embodiments, the step of charging or discharging fluid from the first flow-charging pulley and / or the second flow-charging pulley to adjust the transmission ratio of the driving pulley and the driven pulley to reach the set transmission ratio comprises:

[0034] inflating or deflating one of the first charge pulley and the second charge pulley;

[0035] Adjustment makes the drive belt tensioned.

[0036] The above-mentioned technical scheme provided by the embodiment of the present application has the following advantages compared with the prior art: the internal pressure of the first fluid-filled pulley is adjusted by filling or discharging fluid into the first fluid-filled pulley, thereby adjusting the radial size of the first fluid-filled pulley and the diameter of the driving pulley; the internal pressure of the second fluid-filled pulley is adjusted by filling or discharging fluid into the second fluid-filled pulley, thereby adjusting the radial size of the second fluid-filled pulley and the diameter of the driven pulley; the transmission ratio of the pulley transmission mechanism is adjusted by adjusting the diameter of at least one of the driving pulley and the driven pulley, and the rotational speed of the fan blade connected to the driven pulley is adjusted without changing the rotational speed of the driving motor, and the transmission mechanism has a simple structure and is easy to adjust. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0039] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0040] Figure 1 A schematic diagram of a pulley transmission mechanism provided in one embodiment of the present application;

[0041] Figure 2 A schematic diagram of a pulley transmission mechanism provided in another embodiment of the present application;

[0042] Figure 3 for Figure 1 A radial cross-sectional view of the driven wheel;

[0043] Figure 4 for Figure 2 Schematic diagram of the middle belt tensioning assembly;

[0044] Figure 5 A control logic diagram of a pulley transmission mechanism provided in an embodiment of the present application;

[0045] Figure 6 A flow chart of a control method provided by an embodiment of the present application.

[0046] Description of reference numerals:

[0047] 10-driving wheel; 20-driven wheel; 21-driven wheel body; 22-first inflation channel; 23-second inflation channel; 24-second inflation pulley; 30-first inflation component; 40-second inflation component; 50-temperature sensor; 60-controller; 70-belt tensioning component; 71-lifting drive mechanism; 72-tensioning wheel; 80-transmission belt. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0049] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0050] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0051] In order to solve the technical problems in the prior art that the transmission ratio of the transmission wheel mechanism is difficult to adjust and the speed adjustment of the fan blades of the fixed-frequency unit cannot be achieved, the present application provides a pulley transmission mechanism, an air-conditioning system and a control method. The pulley transmission mechanism can adjust the transmission ratio of the driving wheel 10 and the driven wheel 20, so as to adjust the speed of the fan blades connected to the driven wheel 20 without changing the speed of the driving wheel 10; and the above-mentioned pulley transmission mechanism has a simple structure and is convenient for speed adjustment.

[0052] The present application embodiment provides a pulley transmission mechanism, such as Figure 1 and Figure 2 As shown, the pulley transmission mechanism mainly includes a driving wheel 10, a driven wheel 20 and a transmission belt 80; wherein the driving wheel 10 is used to be connected to the driving motor so as to realize rotation under the drive of the driving motor; the driven wheel 20 is used to install and connect the fan blades, and the driven wheel 20 and the driving wheel 10 are connected by the transmission belt 80, so that the rotation of the driving wheel 10 drives the driven wheel 20 and the fan blades installed and connected to the driven wheel 20 to rotate.

[0053] In particular, the driving wheel 10 of the present application is provided with a first flow-charging pulley, which is used to charge or discharge fluid, and by adjusting the fluid pressure inside the first flow-charging pulley, the first flow-charging pulley undergoes a preset radial dimension change, thereby adjusting the diameter of the driving wheel 10, and thereby adjusting the transmission ratio. And / or, the driven wheel 20 is provided with a second flow-charging pulley 24, which is used to charge or discharge fluid, and by adjusting the fluid pressure inside the second flow-charging pulley 24, the second flow-charging pulley 24 undergoes a preset radial dimension change, thereby adjusting the diameter of the driven wheel 20, and thereby adjusting the transmission ratio.

[0054] Assume that the speed of the driving wheel 10 is n1 and the radius is r1; the speed of the driven wheel 20 is n2 and the radius is r2; n1*r1=n2*r2, the transmission ratio is n2:n1=r1:r2, and the transmission ratio can be adjusted by adjusting r2 or r1. The present application can adjust the radius r1 of the driving wheel 10 by setting a first flow-charging pulley on the driving wheel 10, and / or can adjust the radius r2 of the driven wheel 20 by setting a second flow-charging pulley 24 on the driven wheel 20, thereby adjusting the transmission ratio, so that the speed of the driven wheel 20 and the fan blades installed on the driven wheel 20 can be adjusted under the premise that the speed n1 of the driving wheel 10 remains unchanged. The driving wheel 10 and the driven wheel 20 can be provided with a speed detection mechanism as needed to obtain real-time transmission ratio changes.

[0055] In general, the embodiments of the present application include at least the following three solutions: adjusting the radius of the driving wheel 10 by setting a first flow-charging pulley on the driving wheel 10; or adjusting the radius of the driven wheel 20 by setting a second flow-charging pulley 24 on the driven wheel 20; or adjusting the radius of the driving wheel 10 by setting a first flow-charging pulley on the driving wheel 10 and adjusting the radius of the driven wheel 20 by setting a second flow-charging pulley 24 on the driven wheel 20. The principles of the present application are described below with different embodiments.

[0056] In the above embodiment, the fluid filled into or discharged from the first flow-charging pulley and the second flow-charging pulley 24 can be set as needed. Liquid such as water or gas can be used. The present application does not impose any restrictions on this. The following embodiments will be described by taking the first flow-charging pulley and the second flow-charging pulley 24 as an example to fill or discharge gas to achieve radial dimension adjustment.

[0057] Compared with the multi-gear transmission system of the related art, which realizes transmission ratio adjustment by adjusting the meshing of gears of different specifications and numbers, the pulley transmission mechanism provided in the embodiment of the present application only includes a driving wheel 10 and a driven wheel 20. The diameter of the driving wheel 10 is adjusted by the first flow-charging pulley of the driving wheel 10, and / or the diameter of the driven wheel 20 is adjusted by the second flow-charging pulley 24 of the driven wheel 20, thereby realizing the adjustment of the transmission ratio, reducing the number of transmission parts, and simplifying the structure of the transmission system.

[0058] In addition, the pulley transmission mechanism provided in the embodiment of the present application further includes a belt tensioning assembly 70, by means of which the transmission belt 80 connecting the driving wheel 10 and the driven wheel 20 is kept in a moderate tension state, effectively preventing the transmission belt 80 from loosening due to a change in the diameter of at least one of the driving wheel 10 and the driven wheel 20 when the transmission ratio of the driving wheel 10 and the driven wheel 20 changes, thereby ensuring the transmission efficiency between the driving wheel 10 and the driven wheel 20. If the transmission belt 80 is loose, it may cause the transmission belt 80 to slip, affecting the transmission efficiency. Therefore, adjusting the transmission belt 80 to keep a moderate tension state through the belt tensioning assembly 70 is conducive to ensuring the transmission efficiency between the driving wheel 10 and the driven wheel 20.

[0059] Exemplarily, the belt tensioning assembly 70 includes a tensioning wheel 72 and a lifting drive mechanism 71. The tensioning wheel 72 can rotate relative to its own wheel axle, and the tensioning wheel 72 abuts against the inner side of the transmission belt 80. The axle of the tensioning wheel 72 is fixed to the end of the lifting drive mechanism 71. When the diameter of the driven wheel 20 changes, the lifting drive mechanism 71 drives the tensioning wheel 72 to rise and fall to abut against the tensioned transmission belt 80, so that the transmission belt 80 is in a tensioned state.

[0060] Combined with reference Figure 1 and Figure 3In a preferred embodiment provided in the present application, the driving wheel 10 is provided with a first flow-charging pulley, and the driven wheel 20 is provided with a second flow-charging pulley 24. Taking the structure of the driven wheel 20 as an example, the principle of charging and discharging fluid by the second flow-charging pulley 24 is explained.

[0061] The driven wheel 20 includes a driven wheel body 21, a driven limit plate and a driven inflation tube; the second inflation pulley 24 is sleeved on the outer periphery of the driven wheel body 21, and the transmission belt 80 is sleeved on the outer periphery of the second inflation pulley 24; the driven wheel body 21 adopts a wheel-shaped metal bracket structure, which mainly plays a role of rotation support. The driven wheel body 21 is axially penetrated to open a first inflation channel 22, and the driven inflation tube is fixedly connected to the axial sides of the driven wheel body 21 to support and rotate with the driven wheel body 21. At the same time, the driven inflation tube is connected to the first inflation channel 22, and the end of the driven inflation tube away from the first inflation channel 22 is used to connect with the inflation pipe through a rotating sealing structure to realize rotation inflation of the driven inflation tube. The driven wheel body 21 is provided with a second air charging channel 23 in the radial direction, and the second air charging channel 23 is connected with the first air charging channel 22. When the second flow charging pulley 24 is sleeved on the outer periphery of the driven wheel body 21, the flow charging port arranged on the inner periphery of the second flow charging pulley 24 is sealed and connected with the second air charging channel 23. The driven limiting plate is connected to both sides of the driven wheel body 21 axially, and is used to limit the second flow charging pulley 24, so that the second flow charging pulley 24 mainly changes in radial dimensions when the fluid is filled or discharged. At least one side of the driven limiting plate is detachably connected to the driven wheel body 21, so that the driven limiting plate on this side can be removed to install the second flow charging pulley 24.

[0062] In this way, when the transmission belt 80 drives the driven wheel 20 to rotate by acting on the second charging pulley 24, the driven wheel 20 rotates relative to the supporting structure through the driven charging tube, and the charging pipe of the charging assembly is connected to the driven charging tube through the rotating sealing structure to realize the inflation or exhaust of the driven charging tube in the rotating state, and then the inflation or exhaust of the second charging pulley 24 in the rotating state is realized through the first charging channel 22 and the second charging channel 23. The setting of the rotating sealing structure can refer to the technology, which is not the core improvement of this application, so it will not be shown in the drawings and explained in detail.

[0063] In some embodiments, in order to improve the uniformity of the inflation of the second inflation pulley 24 in the circumferential direction and ensure that its radial dimension changes evenly, the driven wheel 20 remains a relatively regular circle after the dimension changes, thereby ensuring the stability of the rotation of the driven wheel 20. The second inflation channel 23 can be evenly opened in multiple groups along the circumference of the driven wheel body 21. Figure 3The example of four groups of second air charging channels is shown. In a specific implementation, the number of the second air charging channels 23 can be adjusted as needed. The second charging pulley 24 can be made of rubber or other materials to ensure that corresponding deformation can occur when the fluid is filled or discharged; the outer peripheral surface of the second charging pulley 24 is pre-processed to prevent relative sliding between the second charging pulley 24 and the transmission belt 80.

[0064] The structure of the driving wheel 10 is generally similar to that of the driven wheel 20 and will not be described in detail in conjunction with the accompanying drawings; there are also certain differences between the structure of the driving wheel 10 and the driven wheel 20, because the driving wheel 10 needs to be connected to the output shaft of the driving motor and rotate under the drive of the output shaft.

[0065] Exemplarily, the driving wheel 10 includes a driving wheel body, an active limit plate and an active air charging tube. The first charging pulley is sleeved on the outer periphery of the driving wheel body, and the transmission belt 80 is sleeved on the outer periphery of the first charging pulley; the driving wheel body also adopts a wheel-shaped metal bracket structure, so as to play a good role in rotation support. The difference is that the first axial side of the driving wheel body is used to connect the output shaft of the driving motor, and the driving wheel body is provided with a third air charging channel along the axial direction, and the third air charging channel only passes through the second axial side of the driving wheel body.

[0066] The active air-charging tube is fixedly connected to the second side of the axial direction of the driving wheel body, and is used to rotate with the driving wheel body. At the same time, the active air-charging tube is connected to the third air-charging channel. The end of the active air-charging tube away from the third air-charging channel is used to connect to the air-charging pipe through a rotating sealing structure to realize the rotation and inflation of the active air-charging tube. The driving wheel body is provided with a fourth air-charging channel in the radial direction, and the fourth air-charging channel is connected to the third air-charging channel. When the first flow-charging pulley is sleeved on the outer periphery of the driving wheel body, the flow-charging port arranged on the inner periphery of the first flow-charging pulley is sealed and connected to the fourth air-charging channel. The active limiting disk is connected to both sides of the axial direction of the driving wheel body, and is used to limit the first flow-charging pulley, so that the first flow-charging pulley mainly changes in radial size when filling or discharging fluid. The active limiting disk on at least one side is detachably connected to the driving wheel body, so that the active limiting disk on this side can be removed to install the first flow-charging pulley. The output shaft of the driving motor can be fixedly connected to the active limiting disk on the first side of the driving wheel body through a flange structure.

[0067] In order to improve the uniformity of the inflation of the first charging pulley, multiple groups of fourth inflation channels can also be evenly arranged along the circumference of the driving wheel body, and each group of fourth exhaust channels extends along the radial direction of the driving wheel body. The charging port on the first charging pulley and the fourth inflation channel are arranged one by one and sealed and connected. By evenly arranging multiple groups of fourth inflation channels along the circumference of the driving wheel body, the radial dimensions of the first charging pulley at various locations in the circumference change more evenly when inflating or exhausting gas, and the driving wheel 10 always maintains a relatively regular circle, ensuring the stability of rotation.

[0068] The above embodiment adjusts the transmission ratio of the pulley transmission mechanism by setting both the driving wheel 10 and the driven wheel 20 as a structure with adjustable diameter. The pulley transmission mechanism also includes a first inflation component 30 and a second inflation component 40. The first inflation pulley can be connected to the first inflation component 30 through an active inflation pipe. The first inflation component 30 can adopt a structure composed of a first air pump, an inflation pipe and a first inflation valve. The first inflation valve controls the opening and closing of the inflation pipe and the active inflation pipe. The inflation or deflation of the first inflation pulley is achieved by controlling the operation of the first air pump. The first air pump inflates the first inflation pulley when it starts running and deflates the first inflation pulley when it stops running.

[0069] The second inflation pulley 24 can be connected to the second inflation component 40 through a driven inflation pipe. The second inflation component 40 can adopt a structure composed of a second air pump, an inflation pipe and a second inflation valve. The second inflation valve controls the opening and closing of the inflation pipe and the driven inflation pipe, and the inflation or deflation of the second inflation pulley 24 is achieved through the operation of the second air pump.

[0070] When it is necessary to adjust and increase the rotation speed of the fan blade, that is, the driven wheel 20, the diameter of the driving wheel 10 is increased by controlling the first flow-charging pulley to inflate, and the diameter of the driven wheel 20 is reduced by controlling the second flow-charging pulley 24 to deflate. The advantage of such adjustment is that while the diameter of the driving wheel 10 increases, the diameter of the driven wheel 20 is reduced, which is beneficial to keep the transmission belt 80 in a tensioned state.

[0071] Another embodiment of the present application provides a pulley transmission mechanism such as Figures 2 to 4 As shown, in this embodiment, only the second flow-charging pulley 24 is provided on the driven wheel 20 to achieve adjustable diameter of the driven wheel 20, and the diameter of the driving wheel 10 is fixed. When it is necessary to adjust and increase the rotation speed of the fan blade installed on the driven wheel 20, it is only necessary to control the second flow-charging pulley 24 to deflate and reduce the diameter of the driven wheel 20.

[0072] The disadvantage of the above scheme is that only changing the diameter of the driven wheel 20 will cause the tension state of the transmission belt 80 to change. To overcome the above disadvantage, the pulley transmission mechanism provided in this embodiment also includes a belt tensioning assembly 70. The belt tensioning assembly 70 is used to adjust the tension of the transmission belt 80 to ensure that the transmission belt 80 remains in a tensioned state when the radial size of the driven wheel 20 changes, thereby improving the transmission efficiency. The structure and adjustment distance of the belt tensioning assembly 70 can refer to the above embodiment.

[0073] Another embodiment of the present application provides a pulley transmission mechanism which is similar to the above embodiment, except that a driving wheel 10 with adjustable diameter is used in conjunction with a belt tensioning assembly 70, that is, the driving wheel 10 is provided with a first flow-filled pulley, and the diameter of the driving wheel 10 is adjusted by means of the first flow-filled pulley, while the driven wheel 20 remains fixed, and the transmission belt 80 is in a tensioned state by means of the belt tensioning assembly 70 when the diameter of the driving wheel 10 changes.

[0074] By providing the first inflation assembly 30, the first inflation valve, the second inflation assembly 40 and the second inflation valve, the first inflation pulley or the second inflation pulley 24 can be inflated or deflated respectively, or the first inflation pulley and the second inflation pulley 24 can be inflated and deflated simultaneously, thereby improving the flexibility of adjusting the radial dimensions of the driving wheel 10 and the driven wheel 20. At the same time, the belt tensioning assembly 70 can maintain the appropriate tension state of the transmission belt 80, avoid the transmission belt 80 from slipping, and ensure the transmission efficiency of the pulley transmission mechanism.

[0075] Combined with reference Figure 5 In some embodiments, the pulley transmission mechanism also includes a controller 60 and a temperature sensor 50. The temperature sensor 50 is used to detect the ambient temperature. The temperature sensor 50, the first inflatable component 30 and the second inflatable component 40 are all connected to the controller 60, so that the controller 60 adjusts the first inflatable component 30 and its first inflatable valve according to the ambient temperature to realize the inflation and deflation of the first inflation pulley, and controls the second inflatable component 40 and its second inflatable valve to realize the inflation and deflation of the second inflation pulley 24, changes the diameters of the driving wheel 10 and the driven wheel 20, realizes the adjustment of the transmission ratio, and then realizes the adjustment of the fan blade speed, and then realizes the adjustment of the temperature.

[0076] An embodiment of the present application also provides an air-conditioning system, including an outdoor unit and an indoor unit. The outdoor unit includes a compressor and a fan assembly. The fan assembly applies the pulley transmission mechanism provided in the above embodiment. The pulley transmission mechanism is connected between the drive motor and the fan blades of the fan assembly. Under the premise that the drive motor speed remains unchanged, the fan blade speed can be adjusted by adjusting the transmission ratio of the pulley transmission mechanism.

[0077] The present application also provides a control method, such as Figure 6 As shown, the control method includes:

[0078] Step S10: Detecting the ambient temperature and obtaining the fan blade speed according to the ambient temperature;

[0079] Step S20: Calculate the set transmission ratio of the pulley transmission mechanism based on the fan blade rotation speed and the driving motor rotation speed;

[0080] Step S30: Fill or discharge the fluid in the first charging pulley and / or the second charging pulley 24 to adjust the transmission ratio of the driving pulley 10 and the driven pulley 20 to a set transmission ratio.

[0081] When the air conditioning system is running, take the cooling mode as an example: the temperature T can be preset, and the temperature that the air conditioning system can adjust has a limit, that is, Tmin≤T≤Tmax. When the limit is exceeded, the control system will report an error, reminding that the preset temperature T is not within the range. The temperature sensor 50 can monitor the ambient temperature T0 in real time and feed it back to the controller 60. When T<T0, it indicates that the ambient temperature is higher than the set temperature, and it is necessary to increase the fan blade speed to improve the convective heat exchange between the outdoor evaporator and the outdoor environment. The fan blade speed can be calculated based on the difference between the ambient temperature and the set temperature, and then the set transmission ratio of the pulley transmission mechanism can be calculated from the fan blade speed and the speed of the drive motor; finally, the controller 60 controls the first charging pulley to charge or discharge the fluid, and controls the second charging pulley 24 to charge or discharge the fluid, and adjusts the transmission ratio of the driving wheel 10 and the driven wheel 20 to the set transmission ratio.

[0082] Specifically, the step of adjusting the transmission ratio of the driving wheel 10 and the transmission ratio of the driven wheel 20 to reach the set transmission ratio can be to control one of the first flow-charging pulley and the second flow-charging pulley 24 to be inflated, and the other to be deflated; if the ambient temperature is higher than the set temperature in the cooling mode, it is necessary to adjust and increase the rotation speed of the fan blade. At this time, the first flow-charging pulley can be controlled to be inflated, so that the diameter of the driving wheel 10 increases, and the second flow-charging pulley 24 can be controlled to be deflated, so that the diameter of the driven wheel 20 decreases, so that the sum of the radial size changes of the driving wheel 10 and the driven wheel 20 is close to or equal to zero, and the tension state of the transmission belt 80 is maintained. Of course, the first flow-charging pulley can be controlled to be inflated alone, or the second flow-charging pulley 24 can be controlled to be deflated alone. At this time, the transmission belt 80 needs to be adjusted in combination with the belt tensioning assembly 70 to be in a tensioned state.

[0083] When T>T0, it is necessary to adjust and reduce the speed of the fan blades. At this time, the first charging pulley can be controlled to deflate, and the second charging pulley 24 can be controlled to inflate. At this time, r1 decreases, r2 increases, the speed n2 of the driven wheel 20 decreases, the speed of the fan blades connected to the driven wheel 20 also decreases, the output power of the fan decreases, and the ambient temperature increases until the ambient temperature reaches T. There may be some errors between the actual ambient temperature after the unit is adjusted and the set temperature. When the error is within ±0.5℃, the controller 60 controls the first inflatable component 30 and the second inflatable component 40 to stop working, and there is no need to adjust the transmission ratio of the driving wheel 10 and the driven wheel 20.

[0084] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0085] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0086] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A pulley transmission mechanism, characterized in that: include: A driving wheel, used for connecting with a driving motor; A driven wheel, used to connect the fan blades; A transmission belt, which transmits and connects the driving wheel and the driven wheel; The driving wheel is provided with a first fluid-filled pulley, and / or the driven wheel is provided with a second fluid-filled pulley, and the first fluid-filled pulley and the second fluid-filled pulley generate a preset radial size change when the internal fluid pressure changes.

2. The pulley transmission mechanism according to claim 1, characterized in that: Also included is a belt tensioning assembly, the belt tensioning assembly comprising: A tensioning wheel, used for rotating and fitting the transmission belt; The lifting drive mechanism is fixedly connected to the axle of the tensioning wheel and is used to drive the tensioning wheel to move up and down to tension the transmission belt.

3. The pulley transmission mechanism according to claim 1 or 2, characterized in that: The driven wheel comprises: The driven wheel body has a first air charging channel axially formed therein and a second air charging channel radially formed therein which is connected to the first air charging channel. The second air charging pulley is sleeved on the driven wheel body, and the second air charging channel is sealedly connected to the charging port of the second air charging pulley. A driven limiting plate is connected to both axial sides of the driven wheel body and is used to limit the second current charging pulley, and the fan blade is connected to the driven limiting plate; The driven air-inflating pipe is fixedly connected to the driven wheel body and is used to support the driven wheel body. The driven air-inflating pipe is communicated with the first air-inflating passage.

4. The pulley transmission mechanism according to claim 3, characterized in that: The second air charging channels are evenly arranged in a plurality of groups along the radial direction of the driven wheel body, and the charging ports of the second charging pulley are arranged in a one-to-one correspondence with the second air charging channels.

5. The pulley transmission mechanism according to claim 1 or 2, characterized in that: The driving wheel comprises: A driving wheel body, wherein the first side is used to connect to the output shaft of the driving motor, the driving wheel body is provided with a third air charging channel in the axial direction thereof and is connected to the second side thereof, the driving wheel body is provided with a fourth air charging channel in the radial direction thereof and is connected to the third air charging channel, the first charging pulley is sleeved on the driving wheel body, and the fourth air charging channel is sealedly connected to the charging port of the first charging pulley; An active limiting plate, connected to both axial sides of the driving wheel body, for limiting the first charging pulley; An active inflation pipe is connected to the second axial side of the driving wheel body, and the active inflation pipe is communicated with the third inflation channel.

6. The pulley transmission mechanism according to claim 5, characterized in that: The fourth charging channels are evenly arranged in a plurality of groups along the radial direction of the driving wheel body, and the charging ports of the first charging pulley are arranged in a one-to-one correspondence with the fourth charging channels.

7. The pulley transmission mechanism according to claim 1, characterized in that: The first charging pulley is connected to a first charging component, and the first charging component is provided with a first charging valve; the second charging pulley is connected to a second charging component, and the second charging component is provided with a second charging valve.

8. The pulley transmission mechanism according to claim 7, characterized in that: It also includes a controller and a temperature sensor, wherein the temperature sensor, the first inflation valve and the second inflation valve are all connected to the controller; The temperature sensor is used to detect the ambient temperature, the controller is used to control the opening and closing of the first inflation valve according to the ambient temperature to control the inflation and deflation of the first inflation pulley, and the controller is used to control the opening and closing of the second inflation valve to control the inflation and deflation of the second inflation pulley.

9. An air conditioning system, characterized in that: A pulley transmission mechanism comprising any one of claims 1-8.

10. The air conditioning system according to claim 9, characterized in that: The air conditioning system comprises an outdoor unit and an indoor unit, the outdoor unit comprises a fan assembly, and the pulley transmission mechanism is connected between a driving motor and a fan blade of the fan assembly.

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