An indoor unit of an air conditioner and a control method

Abstract

The present invention discloses an indoor unit of an air conditioner and a control method. When the motor or the air deflector rotates at different angles, the resistance value of the variable resistance device is different; the controller obtains the target angle of the air deflector and the actual current value of the variable resistance device; according to the preset corresponding relationship between the air deflector angle and the current value of the variable resistance device, the target current value of the variable resistance device corresponding to the target angle of the air deflector is obtained; if the actual current value of the variable resistance device is not equal to the target current value of the variable resistance device, the motor drives the air deflector to continue to rotate; if the actual current value of the variable resistance device is equal to the target current value of the variable resistance device, the motor and the air deflector stop rotating; thus, the rotation of the air deflector can be accurately controlled without generating overstep sound, nor the problem of long-time air deflector reset action, and moreover, power waste is avoided, and the problem of easy occurrence of overstep sound is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and specifically relates to an indoor unit of an air conditioner and a control method therefor. Background Art

[0002] Existing indoor units of air conditioners have various forms of air deflector and swing blades, which are driven by a stepper motor to control the angle and position of the air deflector, so as to change the indoor air direction. Due to the characteristics of the stepper motor, it needs to be reset every time it is turned on and off to ensure that the position of the air deflector is accurate without deviation. However, at the same time, it also causes the problem of overstep sound when the stepper motor drives the air deflector to reset. Especially for the current special-shaped air deflector, super-large air deflector and other structures, a larger stepper motor is required for driving, and a longer overstep time is needed to ensure the reset of the air deflector, resulting in a longer waiting time for the air deflector to reset and the problem of overstep sound when the air conditioner is turned on and off.

[0003] To solve the above technical problems, generally, through a reasonable design of the overstep steps of the stepper motor, it is ensured that the air deflector can be completely reset without generating too much overstep sound. Since the reset steps of the stepper motor set in the system are fixed values, and the stepper motor cannot directly determine the position of the air deflector during actual operation. Refer to Figures 1 to 3 As shown, the indoor unit of the air conditioner includes an indoor heat exchanger 1, an electric auxiliary heating device 2, a cross-flow fan 3, a stepper motor 4, an air deflector 5, a housing 6, etc. The housing 6 has an air outlet 6-1; the stepper motor 4 drives the air deflector 5 to rotate to open or cover the air outlet 6-1. Figure 1 As shown, the air deflector 5 is at the fully open angle A, Figure 2 As shown, the air deflector 5 is at the fully closed angle C, Figure 3 The air deflector 5 is at the intermediate angle B.

[0004] Assume that under normal circumstances, the air deflector 5 needs the stepper motor 4 to run 1000 steps from angle A to angle C. Generally, 1100 steps or more will be set in the system to ensure the complete reset of the air deflector 5. Therefore, there will be a problem of overstep sound for 100 steps. Assume that angle B is the intermediate position, that is, it normally takes 500 steps from angle B to angle C. If the air conditioner is accidentally powered off and the air deflector 5 is just at this position, then when it is powered on again, the stepper motor 4 needs to run 1100 steps when the air deflector 5 is reset. At this time, there will be 600 steps of overstep reset, resulting in additional power waste and overstep sound problems. Summary of the Invention

[0005] The present invention provides an indoor unit of an air conditioner, which solves the problem of easy occurrence of overstep sound.

[0006] To achieve the above technical objectives, the present invention is implemented by adopting the following technical solutions:

[0007] An indoor unit of an air conditioner, comprising:

[0008] A housing having an air outlet;

[0009] A wind deflector, the rotating shaft of which is rotatably connected to the housing;

[0010] A motor for driving the wind deflector to rotate;

[0011] A variable resistor device connected to the power supply circuit; when the rotation angle of the motor or the wind deflector changes, the resistance value of the variable resistor device also changes;

[0012] A controller configured to:

[0013] Obtain the target angle of the wind deflector and the actual current value of the variable resistor device, and obtain the target current value of the variable resistor device corresponding to the target angle of the wind deflector according to the preset corresponding relationship between the wind deflector angle and the variable resistor device current value;

[0014] If the actual current value of the variable resistor device is not equal to the target current value, the motor drives the wind deflector to continue rotating;

[0015] If the actual current value of the variable resistor device is equal to the target current value, the motor and the wind deflector stop rotating.

[0016] In some embodiments of the present application, the variable resistor device includes:

[0017] A constant-resistance gear including a tooth disc and a plurality of teeth with the same resistance value arranged on the outer peripheral surface of the tooth disc; the plurality of teeth of the constant-resistance gear are respectively electrically connected to the tooth disc of the constant-resistance gear; the tooth disc of the constant-resistance gear has a first electrical connection end;

[0018] A variable-resistance gear including a tooth disc and a plurality of teeth with different resistance values arranged on the outer peripheral surface of the tooth disc; the plurality of teeth of the variable-resistance gear are respectively electrically connected to the tooth disc of the variable-resistance gear; the tooth disc of the variable-resistance gear has a second electrical connection end;

[0019] Wherein, the first electrical connection end and the second electrical connection end are electrically connected to the power supply circuit; the motor or the wind deflector drives the variable-resistance gear or the constant-resistance gear to rotate; only one tooth of the variable-resistance gear and the constant-resistance gear meshes at the same time.

[0020] In some embodiments of the present application, the variable resistor device includes:

[0021] A constant-resistance gear including a tooth disc and a plurality of teeth with the same resistance value arranged on the outer peripheral surface of the tooth disc; the plurality of teeth of the constant-resistance gear are respectively electrically connected to the tooth disc of the constant-resistance gear; the tooth disc of the constant-resistance gear has a first electrical connection end;

[0022] A variable - resistance gear, which includes a toothed disk and a plurality of teeth disposed on the outer peripheral surface of the toothed disk; among the plurality of teeth of the variable - resistance gear, the resistance values of some of the teeth are different from each other, and the resistance values of the remaining teeth are the same; the plurality of teeth of the variable - resistance gear are respectively electrically connected to the toothed disk of the variable - resistance gear; the toothed disk of the variable - resistance gear has a second electrical connection end;

[0023] Wherein, the first electrical connection end and the second electrical connection end are electrically connected to the power supply circuit; the motor or the air deflector drives the variable - resistance gear or the constant - resistance gear to rotate; at any given time, only one tooth of the variable - resistance gear and the constant - resistance gear meshes.

[0024] In some embodiments of the present application, the toothed disk of the variable - resistance gear includes a central rotating shaft and an annular columnar body; the central rotating shaft is a conductor with a constant resistance value, and the annular columnar body is an insulator;

[0025] The annular columnar body is sleeved around the central rotating shaft, and the plurality of teeth of the variable - resistance gear are disposed on the outer peripheral surface of the annular columnar body; the plurality of teeth of the variable - resistance gear are respectively electrically connected to the central rotating shaft; the central rotating shaft has the second electrical connection end as described above.

[0026] In some embodiments of the present application, each tooth of the variable - resistance gear is detachably connected to the annular columnar body.

[0027] In some embodiments of the present application, the outer peripheral surface of the annular columnar body of the variable - resistance gear has a plurality of slots; each slot has a conductive contact; the conductive contact is electrically connected to the central rotating shaft of the variable - resistance gear;

[0028] Each tooth of the variable - resistance gear has a plug, and the plug also has a conductive contact;

[0029] The plug of each tooth is detachably inserted into the corresponding slot; the conductive contact of the plug contacts the conductive contact of the corresponding slot.

[0030] In some embodiments of the present application, the output shaft of the motor drives the variable - resistance gear to rotate, the variable - resistance gear drives the constant - resistance gear to rotate, and the constant - resistance gear drives the air deflector to rotate;

[0031] Or,

[0032] The output shaft of the motor drives the constant - resistance gear to rotate, the constant - resistance gear drives the variable - resistance gear to rotate, and the variable - resistance gear drives the air deflector to rotate.

[0033] An indoor unit control method for an air conditioner, the indoor unit of the air conditioner includes a motor, a wind deflector, and a variable resistor device; the variable resistor device is connected to the power supply circuit; when the rotation angle of the motor or the wind deflector changes, the resistance value of the variable resistor device also changes;

[0034] The control method includes:

[0035] Obtain the target angle of the wind deflector and the actual current value of the variable resistor device;

[0036] According to the preset corresponding relationship between the wind deflector angle and the current value of the variable resistor device, obtain the target current value of the variable resistor device corresponding to the target angle of the wind deflector;

[0037] Judge whether the actual current value of the variable resistor device is equal to the target current value;

[0038] If the actual current value of the variable resistor device is not equal to the target current value, the motor drives the wind deflector to continue rotating;

[0039] If the actual current value of the variable resistor device is equal to the target current value, the motor and the wind deflector stop rotating.

[0040] In some embodiments of the present application, the corresponding relationship between the wind deflector angle and the current value of the variable resistor device is a corresponding table or a relationship curve.

[0041] In some embodiments of the present application, when presetting the corresponding relationship between the wind deflector angle and the current value of the variable resistor device, during the process of the motor driving the wind deflector to rotate from the minimum angle to the maximum angle, every time the rotation angle of the wind deflector increases by a set step length, record the rotation angle of the wind deflector and the current value of the variable resistor device to form a corresponding table of the wind deflector angle and the current value of the variable resistor device.

[0042] Compared with the prior art, the advantages and positive effects of the present invention are: for the indoor unit of the air conditioner and the control method of the present invention, when the rotation angle of the motor or the wind deflector is different, the resistance value of the variable resistor device is different; the controller obtains the target angle of the wind deflector and the actual current value of the variable resistor device; according to the preset corresponding relationship between the wind deflector angle and the current value of the variable resistor device, obtain the target current value of the variable resistor device corresponding to the target angle of the wind deflector; if the actual current value of the variable resistor device is not equal to the target current value of the variable resistor device, the motor drives the wind deflector to continue rotating; if the actual current value of the variable resistor device is equal to the target current value of the variable resistor device, the motor and the wind deflector stop rotating; thus, the rotation of the wind deflector can be accurately controlled without generating overstep sound, nor the problem of long-time wind deflector reset action, and moreover, power waste is avoided, and the problem of easy occurrence of overstep sound is solved.

[0043] After reading the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become clearer. Brief Description of the Drawings

[0044] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0045] Figure 1 It is a schematic structural diagram when the air deflector of the indoor unit of the air conditioner is fully opened;

[0046] Figure 2 It is a schematic structural diagram when the air deflector of the indoor unit of the air conditioner is fully closed;

[0047] Figure 3 It is a schematic structural diagram when the air deflector of the indoor unit of the air conditioner is half opened;

[0048] Figure 4 It is a schematic structural diagram of an embodiment of the indoor unit of the air conditioner proposed by the present invention;

[0049] Figure 5 is Figure 4 a schematic structural diagram of an embodiment of the variable resistance device in;

[0050] Figure 6 is Figure 4 a schematic structural diagram of another embodiment of the variable resistance device in;

[0051] Figure 7 It is a flowchart of an embodiment of the control method of the indoor unit of the air conditioner proposed by the present invention;

[0052] Figure 8 It is a flowchart of another embodiment of the control method of the indoor unit of the air conditioner proposed by the present invention.

[0053] Reference Signs:

[0054] 1. Indoor heat exchanger; 2. Electric auxiliary heating device; 3. Cross-flow fan;

[0055] 4. Motor; 4-1. Output shaft;

[0056] 5. Air deflector; 5-1. Air deflector main body; 5-2. Link; 5-3. Rotating shaft;

[0057] 6. Housing; 6-1. Air outlet;

[0058] RV. Variable resistance device;

[0059] 7. Constant resistance gear; 7-1. Tooth disc; 7-1-1. Central rotating shaft; 7-1-2. Annular columnar body;

[0060] 7-2. Tooth

[0061] 8. Variable resistance gear; 8-1. Tooth disc; 8-1-1. Central rotating shaft; 8-1-2. Annular columnar body

[0062] 8-2. Tooth; 8-3. Tooth Detailed implementation manners

[0063] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0064] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0065] In the description of this application, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0066] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0067] In view of the technical problem that the indoor unit of the air conditioner is prone to generate overstep sound at present, the present invention proposes an indoor unit of an air conditioner and a control method to prevent the generation of overstep sound and avoid waste of electric energy. Next, the indoor unit of the air conditioner and the control method of the present invention will be described in detail in conjunction with the accompanying drawings.

[0068] Figure 1 、 Figure 2, Figure 3 It is a schematic diagram of an indoor unit of an air conditioner, showing the air deflector 5 of the indoor unit of the air conditioner at the fully open angle A, the fully closed angle C, and the intermediate angle B respectively. The motor rotates, and then drives the air deflector to rotate. The motor in this application is preferably a stepper motor to facilitate the control of the motor rotation. Of course, other motors can also be selected according to actual needs.

[0069] Embodiment 1

[0070] The indoor unit of the air conditioner in this embodiment includes a housing 6, an air deflector 5, a motor 4, a variable resistor device RV, a controller, etc., as shown in Figure 4 shown.

[0071] The housing 6 has an air outlet 6-1.

[0072] The air deflector 5 has a rotating shaft 5-3 rotatably connected to the housing 6.

[0073] The motor 4 drives the air deflector 5 to rotate.

[0074] The variable resistor device RV is connected to the power supply circuit. When the rotation angle of the motor 4 or the air deflector 5 changes, the resistance value of the variable resistor device RV also changes. The resistance value of the variable resistor device RV changes following the change of the rotation angle of the motor 4 or the air deflector 5. Different rotation angles of the motor 4 or the air deflector 5 result in different resistance values of the variable resistor device RV. The resistance value of the variable resistor device RV corresponds to the rotation angle of the motor 4 or the air deflector 5.

[0075] The controller is used to control the rotation of the motor 4 and the operation of the entire indoor unit of the air conditioner.

[0076] When the stepper motor drives the air deflector to rotate, the resistance value of the variable resistor device RV changes, and the current value of the variable resistor device RV also changes. The power supply circuit can be an independent power supply circuit for the variable resistor device RV. By monitoring the current value of the variable resistor device RV, the rotation angle of the motor or the air deflector can be obtained. The power supply circuit can also be the power supply circuit of the motor, that is, the variable resistor device RV is connected in series with the power supply circuit of the motor. By monitoring the current value of the variable resistor device RV or the current value of the stepper motor, the rotation angle of the motor or the air deflector can be obtained.

[0077] When the stepper motor drives the air deflector to rotate, different rotation angles correspond to different resistance values of the variable resistor device RV, and the current values flowing through the variable resistor device RV are different. Therefore, the real-time position of the air deflector can be directly determined by monitoring the current value of the variable resistor device RV. Preset the corresponding relationship between the air deflector angle and the current value of the variable resistor device. By monitoring the real-time current value of the variable resistor device, the actual angle of the air deflector can be determined.

[0078] Therefore, the controller is configured to:

[0079] Obtain the target angle of the air deflector and the actual current value of the variable resistor device; according to the preset corresponding relationship between the air deflector angle and the variable resistor device current value, obtain the target current value of the variable resistor device corresponding to the target angle of the air deflector.

[0080] If the actual current value of the variable resistor device is not equal to the target current value, it means that the air deflector has not reached the target angle, then the motor drives the air deflector to continue rotating.

[0081] If the actual current value of the variable resistor device is equal to the target current value, it means that the air deflector has reached the target angle, then the motor and the air deflector stop rotating, avoiding waste of electric energy and preventing the generation of overstep sound.

[0082] In the indoor unit of the air conditioner of this embodiment, by setting the variable resistor device RV, the motor drives the air deflector to rotate. When the motor or the air deflector rotates at different angles, the resistance value of the variable resistor device RV is different; the controller obtains the target angle of the air deflector and the actual current value of the variable resistor device; according to the preset corresponding relationship between the air deflector angle and the variable resistor device current value, obtain the target current value of the variable resistor device corresponding to the target angle of the air deflector; if the actual current value of the variable resistor device is not equal to the target current value of the variable resistor device, then the motor drives the air deflector to continue rotating; if the actual current value of the variable resistor device is equal to the target current value of the variable resistor device, then the motor and the air deflector stop rotating; thus, the rotation of the air deflector can be accurately controlled without generating overstep sound, nor the problem of long-time air deflector reset action, and at the same time, waste of electric energy is avoided, and the problem of easy occurrence of overstep sound is solved.

[0083] In an embodiment of the present application, the variable resistor device RV includes a constant resistance gear 7 and a variable resistance gear 8, as shown in Figure 4 、 Figure 5 shown.

[0084] The constant resistance gear 7 includes a tooth disc 7-1 and a plurality of teeth 7-2 with the same resistance value arranged on the outer peripheral surface of the tooth disc 7-1. The plurality of teeth 7-2 of the constant resistance gear 7 are respectively electrically connected to the tooth disc 7-1 of the constant resistance gear 7; the tooth disc 7-1 of the constant resistance gear 7 has a first electrical connection end for connecting the power supply circuit. The constant resistance gear 7 is a constant resistance conductor, and the resistance value of the constant resistance gear 7 is fixed. The constant resistance gear 7 is generally set as an integral body.

[0085] The variable resistance gear 8 includes a tooth disc 8-1 and a plurality of teeth 8-2 with different resistance values arranged on the outer peripheral surface of the tooth disc 8-1; the resistance values of the respective teeth 8-2 are different; the plurality of teeth 8-2 of the variable resistance gear 8 are respectively electrically connected to the tooth disc 8-1 of the variable resistance gear 8; the tooth disc 8-1 of the variable resistance gear 8 has a second electrical connection end for connecting the power supply circuit.

[0086] Among them, the first electrical connection terminal and the second electrical connection terminal are electrically connected to the power supply circuit; the motor 4 or the air deflector 5 drives the variable resistance gear 8 or the constant resistance gear 7 to rotate; only one tooth of the variable resistance gear 8 and the constant resistance gear 7 meshes at the same time. The tooth 7-2 of the constant resistance gear 7 and the tooth 8-2 of the variable resistance gear 8 are both conductors. When the tooth 7-2 meshes with the tooth 8-2, the tooth 7-2 is electrically connected to the tooth 8-2, and electrical signal transmission can be carried out to realize the electrical connection between the constant resistance gear 7 and the variable resistance gear 8.

[0087] The first electrical connection terminal of the constant resistance gear 7 and the second electrical connection terminal of the variable resistance gear 8 are connected to the external power supply line, that is, connected to the power supply circuit.

[0088] When the power supply circuit is turned on, the current flow direction in the variable resistance device RV is as follows: the first electrical connection terminal of the constant resistance gear 7, the tooth disk 7-1 of the constant resistance gear 7, the tooth 7-2, the tooth 8-2 meshing with the tooth 7-2, the tooth disk 8-1 of the variable resistance gear 8, and the second electrical connection terminal. Or, the current first flows into the variable resistance gear 8 from the second electrical connection terminal, then flows into the constant resistance gear 7, and then flows out from the first electrical connection terminal. Since only one tooth of the variable resistance gear 8 and the constant resistance gear 7 meshes and conducts electricity at the same time, when the variable resistance gear 8 meshes and rotates with the constant resistance gear 7, the tooth 8-2 meshing with the constant resistance gear 7 is different, and the resistance value of the variable resistance gear 8 changes. Therefore, the resistance value of the entire variable resistance device RV changes, and the current value flowing through the variable resistance device RV changes.

[0089] When the motor 4 or the air deflector 5 rotates, a force is applied to the constant resistance gear 7 or the variable resistance gear 8. The constant resistance gear 7 or the variable resistance gear 8 rotates under the force, the meshing teeth of the two gears change, the resistance value of the variable resistance device RV changes, and the current value flowing through the variable resistance device RV also changes.

[0090] By designing the above variable resistance device RV, it is convenient for the motor 4 to drive the constant resistance gear 7 and the variable resistance gear 8 to rotate. Moreover, the resistance values of the respective teeth of the variable resistance gear 8 are different, realizing the change of the resistance value of the variable resistance device RV at all angles.

[0091] The maximum variable resistance angle of the variable resistance gear device RV should cover the maximum rotation angle of the air deflector 5. That is, the minimum angle of the variable resistance gear 8 ≤ the minimum angle of the air deflector 5, and the maximum angle of the variable resistance gear 8 ≥ the maximum angle of the air deflector 5.

[0092] The variable resistance device RV is a device with different resistance values at different rotation angles. The variable resistance device RV can be connected to the air deflector 5 or directly to the stepper motor 4, so that at different angles during the rotation of the stepper motor, the corresponding resistance values of the variable resistance device are different, and the current of the stepper motor or the variable resistance device is different. Therefore, the real-time position of the air deflector can be directly determined by monitoring the current value of the stepper motor or the variable resistance device, so that the rotation of the air deflector can be accurately controlled without generating overstep sound or long-time deflector reset action problems.

[0093] When the stepper motor drives the air deflector to rotate, the variable resistance device is also forced to rotate. Since the resistance values of the variable resistance device at different angles are determined, the corresponding current required for the stepper motor to drive the air deflector to rotate, or the current value of the variable resistance device is determined. By presetting the corresponding relationship between the air deflector angle and the current value, the actual angle of the air deflector can be determined by monitoring the real-time current value of the stepper motor or the variable resistance device.

[0094] In some embodiments of the present application, the tooth disk 7-1 of the constant resistance gear 7 includes a central rotating shaft 7-1-1 and an annular columnar body 7-1-2; both the central rotating shaft 7-1-1 and the annular columnar body 7-1-2 are conductors with constant resistance values; the annular columnar body 7-1-2 is sleeved on the periphery of the central rotating shaft 7-1-1, and multiple teeth 7-2 of the constant resistance gear 7 are arranged on the outer peripheral surface of the annular columnar body 7-1-2; multiple teeth 7-2 of the constant resistance gear 7 are respectively electrically connected to the central rotating shaft 7-1-1; the central rotating shaft 7-1-1 has a second electrical connection end. Since the constant resistance gear 7 is a conductor with a constant resistance value, the constant resistance gear 7 is integrally formed.

[0095] In some embodiments of the present application, in order to save conductor materials, the tooth disk 8-1 of the variable resistance gear 8 includes a central rotating shaft 8-1-1 and an annular columnar body 8-1-2; the central rotating shaft 8-1-1 is a conductor with a constant resistance value; the annular columnar body 8-1-2 is an insulator; the annular columnar body 8-1-2 is sleeved on the periphery of the central rotating shaft 8-1-1, and multiple teeth 8-2 of the variable resistance gear 8 are arranged on the outer peripheral surface of the annular columnar body 8-1-2; multiple teeth 8-2 of the variable resistance gear 8 are respectively electrically connected to the central rotating shaft 8-1-1; the central rotating shaft 8-1-1 has a second electrical connection end.

[0096] Specifically, there are multiple wires in the annular columnar body 8-1-2 for electrically connecting the central rotating shaft 8-1-1 and the tooth 8-2; one end of each wire is electrically connected to the central rotating shaft 8-1-1, and the other end is electrically connected to the corresponding tooth 8-2.

[0097] In some embodiments of the present application, in order to facilitate the design, processing and assembly of the variable resistance gear 8, each tooth 8-2 of the variable resistance gear 8 is detachably connected to the annular columnar body 8-1-2.

[0098] In some embodiments of the present application, in order to facilitate the electrical connection between the teeth 8-2 of the variable resistance gear 8 and the central rotating shaft 8-1-1, the outer peripheral surface of the annular columnar body 8-1-2 of the variable resistance gear 8 has a plurality of slots; each slot has a conductive contact; the conductive contact in the slot is electrically connected to the central rotating shaft 8-1-1 of the variable resistance gear 8 through a wire; each tooth 8-2 of the variable resistance gear 8 has a plug, and the plug also has a conductive contact; the plug of each tooth 8-2 is detachably inserted into the corresponding slot; the conductive contact of the plug contacts the conductive contact of the corresponding slot, realizing the electrical connection between the tooth 8-2 and the central rotating shaft 8-1-1.

[0099] By designing a plug on the tooth 8-2 and a slot on the annular columnar body 8-1-2, not only the stable and reliable connection between the tooth 8-2 and the annular columnar body 8-1-2 is realized, which is convenient for disassembly and assembly, but also the electrical connection between the tooth 8-2 and the annular columnar body 8-1-2 is realized while ensuring stable and reliable connection.

[0100] Of course, the annular columnar body 8-1-2 of the variable resistance gear 8 can also be directly set as a conductor with a constant resistance value. Each tooth of the variable resistance gear 8 is directly electrically connected to the annular columnar body 8-1-2.

[0101] For electrical safety, the output shaft 4-1 of the motor 4 and the rotating shaft 5-3 of the air deflector 5 are both insulators.

[0102] In some embodiments of the present application, in order to facilitate the driving of the air deflector 5, the constant resistance gear 7, and the variable resistance gear 8 by the motor 4, the output shaft 4-1 of the motor 4 is connected to the central rotating shaft 8-1-1 of the variable resistance gear 8, and the central rotating shaft 7-1-1 of the constant resistance gear 7 is connected to the rotating shaft 5-3 of the air deflector 5. The output shaft 4-1 of the motor 4 drives the variable resistance gear 8 to rotate, the variable resistance gear 8 drives the constant resistance gear 7 to rotate, and the constant resistance gear 7 drives the air deflector 5 to rotate.

[0103] In some other embodiments of the present application, in order to facilitate the driving of the air deflector 5, the constant resistance gear 7, and the variable resistance gear 8 by the motor 4, the output shaft 4-1 of the motor 4 is connected to the central rotating shaft 7-1-1 of the constant resistance gear 7, and the central rotating shaft 8-1-1 of the variable resistance gear 8 is connected to the rotating shaft 5-3 of the air deflector 5. The output shaft 4-1 of the motor 4 drives the constant resistance gear 7 to rotate, the constant resistance gear 7 drives the variable resistance gear 8 to rotate, and the variable resistance gear 8 drives the air deflector 5 to rotate.

[0104] In some other embodiments of the present application, in order to simplify the structural design of the variable resistance gear 8, among the multiple teeth on the outer peripheral surface of the tooth disk 8-1 of the variable resistance gear 8, the resistance values of some of the teeth are different from each other, and the resistance values of the remaining teeth are the same. The multiple teeth with different resistance values are arranged continuously in sequence; the multiple teeth with the same resistance value are arranged continuously in sequence. For example, see Figure 6As shown, among the seven teeth arranged on the outer peripheral surface of the toothed disc 8-1 of the variable resistance gear 8, the resistance values of four continuously arranged teeth 8-2 are different from each other, and the resistance values of the remaining three continuously arranged teeth 8-3 are the same; the teeth 8-2 and 8-3 are respectively electrically connected to the toothed disc 8-1 of the variable resistance gear 8. A plurality of teeth 8-2 with different resistance values are detachably connected to the annular column 8-1-2. A plurality of teeth 8-3 with the same resistance value are fixedly connected to the annular column 8-1-2. Of course, they can also be detachably connected.

[0105] When the air deflector rotates from the minimum angle to the maximum angle, the teeth 8-2 with different resistance values of the variable resistance gear 8 are sequentially engaged with the constant resistance gear 7, and the overall resistance value of the variable resistance gear 8 changes.

[0106] In this embodiment, the air deflector 5 includes an air deflector main body 5-1, two connecting rods 5-2, and two rotating shafts 5-3, as shown in Figure 4 shown; the two ends of the air deflector main body 5-1 in the length direction are respectively provided with connecting rods 5-2, and the connecting rods 5-2 are fixedly connected to the rotating shafts 5-3.

[0107] For example, as shown in Figure 4 shown, the air deflector 5 includes a left connecting rod, a right connecting rod, a left rotating shaft, and a right rotating shaft; the left connecting rod is fixed to the left end of the air deflector main body 5-1, and the right connecting rod is fixed to the right end of the air deflector main body 5-1; the left rotating shaft is fixedly connected to the left connecting rod, and the right rotating shaft is fixedly connected to the right connecting rod. The left rotating shaft is rotatably connected to the housing 6, and the right rotating shaft is rotatably connected to the housing 6. The central rotating shaft of the constant resistance gear 7 or the variable resistance gear 8 is fixedly connected to the right rotating shaft of the air deflector 5, driving the right rotating shaft to rotate, and then driving the right connecting rod, the air deflector main body, the left connecting rod, and the left rotating shaft to rotate, realizing the rotation of the entire air deflector 5.

[0108] In this embodiment, the variable resistance device RV is arranged on the stepping motor or the air deflector rotating shaft. By monitoring the current of the variable resistance device RV or the stepping motor and cooperating with the variable resistance device RV, the rotation of the air deflector can be accurately controlled without problems such as overstep sound or long-time air deflector reset action.

[0109] In the indoor unit of the air conditioner of this embodiment, by combining the variable resistance device RV with the stepping motor, when the stepping motor drives the air deflector to rotate, the current values generated at different angles are determined. By monitoring and judging the current values, the real-time position of the air deflector can be determined, and the air deflector can be accurately controlled to reset or act.

[0110] Embodiment Two

[0111] Based on the design of the indoor unit of the air conditioner in Embodiment One, this Embodiment Two proposes a control method for the indoor unit of the air conditioner.

[0112] The indoor unit of the air conditioner includes a motor, a wind deflector, a variable resistor device, a controller, etc.; the variable resistor device is connected to the power supply circuit; when the rotation angle of the motor or the wind deflector changes, the resistance value of the variable resistor device also changes.

[0113] The control method of the indoor unit of the air conditioner in this embodiment mainly includes the following steps, as shown in Figure 7 shown.

[0114] Step S1: Obtain the target angle of the wind deflector and the actual current value of the variable resistor device.

[0115] The controller receives a control instruction and parses the target angle of the wind deflector according to the control instruction.

[0116] The actual current value of the variable resistor device or the motor is monitored in real time through a current sensor.

[0117] Step S2: Obtain the target current value of the variable resistor device corresponding to the target angle of the wind deflector according to the preset corresponding relationship between the wind deflector angle and the current value of the variable resistor device.

[0118] Step S3: Determine whether the actual current value of the variable resistor device is equal to the target current value of the variable resistor device.

[0119] If the actual current value of the variable resistor device is not equal to the target current value of the variable resistor device, it means that the wind deflector has not reached the target angle, then execute Step S4: The motor drives the wind deflector to continue rotating.

[0120] If the actual current value of the variable resistor device is equal to the target current value of the variable resistor device, it means that the wind deflector has reached the target angle, then execute Step S5: The motor and the wind deflector stop rotating to avoid waste of electric energy and prevent the generation of overstep sound.

[0121] The control method of the indoor unit of the air conditioner in this embodiment, by setting a variable resistor device, when the rotation angle of the motor or the wind deflector is different, the resistance value of the variable resistor device is different; obtaining the target angle of the wind deflector and the actual current value of the variable resistor device; obtaining the target current value of the variable resistor device corresponding to the target angle of the wind deflector according to the preset corresponding relationship between the wind deflector angle and the current value of the variable resistor device; determining whether the actual current value of the variable resistor device is equal to the target current value; if the actual current value of the variable resistor device is not equal to the target current value, then the motor drives the wind deflector to continue rotating; if the actual current value of the variable resistor device is equal to the target current value, then the motor and the wind deflector stop rotating; thereby, the rotation of the wind deflector can be accurately controlled without generating overstep sound, nor the problem of long-time wind deflector reset action, and the waste of electric energy is avoided, and the problem of easy occurrence of overstep sound is solved.

[0122] In some embodiments of the present application, the corresponding relationship between the air deflector angle and the current value of the variable resistor device is a corresponding table or a relationship curve, which is convenient for querying. The corresponding relationship between the air deflector angle and the current value of the variable resistor device is stored in the storage module of the indoor unit of the air conditioner for timely querying.

[0123] Through the corresponding table or relationship curve between the air deflector angle and the current value of the variable resistor device, the target current value of the variable resistor device corresponding to the target angle of the air deflector can be simply, conveniently, directly and quickly obtained, and the actual angle of the air deflector corresponding to the actual current value of the variable resistor device can also be conveniently obtained.

[0124] In some embodiments of the present application, when presetting the corresponding relationship between the air deflector angle and the current value of the variable resistor device, during the process of the motor driving the air deflector to rotate from the minimum angle to the maximum angle, every time the rotation angle of the air deflector increases by a set step length, the rotation angle of the air deflector and the current value of the variable resistor device are recorded once to form a corresponding table of the air deflector angle and the current value of the variable resistor device. Through the above steps, a relatively accurate air deflector angle and the current value of the variable resistor device can be obtained to form a relatively accurate corresponding table and store it.

[0125] The rotation range of the air deflector is from angle C to angle A. Assuming that the minimum angle of the air deflector is C and the maximum angle is A, the angle range from C to A is evenly divided, and each angle corresponds to a current value.

[0126] If the variable resistor device is connected in series in the power supply circuit of the motor, when the resistance value of the variable resistor device changes, the actual current value of the motor also changes. By monitoring the current value of the variable resistor device or the current value of the stepping motor, the rotation angle of the motor or the air deflector can be known.

[0127] For example, angle C is 0°, angle A is 60°, and the set step length is 10°. When the air deflector is at an angle of 0°, the resistance of the variable resistor device is 1Ω, and the current value of the variable resistor device or the stepping motor is recorded as 0.3 A; when the rotation angle of the air deflector increases by 10°, that is, the air deflector angle is 10°, the resistance of the variable resistor device is 2Ω, and the current value of the variable resistor device or the stepping motor is recorded as 0.4 A; when the rotation angle of the air deflector increases by 10° again, that is, the air deflector angle is 20°, the resistance of the variable resistor device is 3Ω, and the current value of the variable resistor device or the stepping motor is recorded as 0.5 A;...; when the rotation angle of the air deflector increases by 10°, that is, the air deflector angle is 60°, the resistance of the variable resistor device is 7Ω, and the current value of the variable resistor device or the stepping motor is recorded as 0.9 A, as shown in Table 1.

[0128] Table 1 Corresponding table of air deflector angle and current value

[0129]

[0130]

[0131] Fit a relationship curve according to the correspondence table. A relationship formula can also be obtained based on the relationship curve.

[0132] Next, through a specific embodiment, the principle of the control method for the indoor unit of the air conditioner according to the present application will be described in detail.

[0133] Preset a correspondence table or curve between the air deflector angle and the current value of the variable resistor device. The user sets the target angle of the air deflector, and by querying the correspondence table, obtains the target current value H of the variable resistor device corresponding to the target angle of the air deflector. Monitor the actual current value P of the variable resistor device.

[0134] Preset condition: the actual current value P of the variable resistor device = the target current value H of the variable resistor device.

[0135] When it is monitored that the actual current value P of the variable resistor device = the target current value H of the variable resistor device, the preset condition is satisfied, and the air deflector reaches the target position set by the user.

[0136] When it is monitored that the actual current value P of the variable resistor device < H, or P > H, the preset condition is not satisfied.

[0137] See Figure 8 As shown, the stepping motor drives the air deflector to act, monitors the actual current value P of the variable resistor device, queries the preset correspondence table, and obtains the real-time angle of the air deflector. Determine whether the preset condition is satisfied; if the preset condition is not satisfied, the stepping motor drives the air deflector to continue to act; if the preset condition is satisfied, the air deflector reaches the target angle, the motor stops rotating, and the air deflector stops rotating.

[0138] Embodiment III

[0139] Based on the design of the indoor unit of the air conditioner in Embodiment I, this Embodiment III proposes an air conditioner, including the indoor unit of the air conditioner described above.

[0140] By adopting the indoor unit of the air conditioner in the air conditioner, the rotation of the air deflector can be accurately controlled without generating overstep sound, nor the problem of long-time air deflector reset action, and moreover, power waste is avoided, and the problem of easy occurrence of overstep sound is solved.

[0141] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An indoor unit of an air conditioner, characterized in that: Comprising: A housing having an air outlet; A wind deflector whose rotating shaft is rotatably connected to the housing; A motor that drives the wind deflector to rotate; A variable resistance device connected to the power supply circuit; when the rotation angle of the motor or the wind deflector changes, the resistance value of the variable resistance device also changes; A controller configured to: Obtain the target angle of the wind deflector and the actual current value of the variable resistance device, and obtain the target current value of the variable resistance device corresponding to the target angle of the wind deflector according to the preset corresponding relationship between the wind deflector angle and the variable resistance device current value; If the actual current value of the variable resistance device is not equal to the target current value, the motor drives the wind deflector to continue rotating; If the actual current value of the variable resistance device is equal to the target current value, the motor and the wind deflector stop rotating; The variable resistance device includes: A constant resistance gear including a toothed disk and a plurality of teeth with the same resistance value disposed on the outer peripheral surface of the toothed disk; the plurality of teeth of the constant resistance gear are respectively electrically connected to the toothed disk of the constant resistance gear; the toothed disk of the constant resistance gear has a first electrical connection end; A variable resistance gear including a toothed disk and a plurality of teeth disposed on the outer peripheral surface of the toothed disk; the resistance values of the plurality of teeth of the variable resistance gear are different from each other, or among the plurality of teeth of the variable resistance gear, the resistance values of some of the teeth are different from each other, and the resistance values of the remaining teeth are the same; the plurality of teeth of the variable resistance gear are respectively electrically connected to the toothed disk of the variable resistance gear; the toothed disk of the variable resistance gear has a second electrical connection end; Wherein, the first electrical connection end and the second electrical connection end are electrically connected to the power supply circuit; the motor or the wind deflector drives the variable resistance gear or the constant resistance gear to rotate; only one tooth of the variable resistance gear and the constant resistance gear meshes at the same time.

2. The indoor unit of an air conditioner according to claim 1, characterized in that: The toothed disk of the variable resistance gear includes a central rotating shaft and an annular columnar body; the central rotating shaft is a conductor with a constant resistance value, and the annular columnar body is an insulator; The annular columnar body is sleeved around the outer periphery of the central rotating shaft, and the plurality of teeth of the variable resistance gear are disposed on the outer peripheral surface of the annular columnar body; the plurality of teeth of the variable resistance gear are respectively electrically connected to the central rotating shaft; the central rotating shaft has the second electrical connection end as described above.

3. The indoor unit of an air conditioner according to claim 2, characterized in that: Each tooth of the variable resistance gear is detachably connected to the annular columnar body.

4. The indoor unit of an air conditioner according to claim 3, characterized in that: The outer peripheral surface of the annular columnar body of the variable resistance gear has a plurality of slots; each slot has a conductive contact; the conductive contact is electrically connected to the central rotating shaft of the variable resistance gear; Each tooth of the variable resistance gear has a plug, and the plug also has a conductive contact; The plug of each tooth is detachably inserted into the corresponding slot; the conductive contact of the plug contacts the conductive contact of the corresponding slot.

5. The indoor unit of an air conditioner according to claim 1, characterized in that: The output shaft of the motor drives the variable resistance gear to rotate, the variable resistance gear drives the constant resistance gear to rotate, and the constant resistance gear drives the wind deflector to rotate; Or, The output shaft of the motor drives the constant resistance gear to rotate, the constant resistance gear drives the variable resistance gear to rotate, and the variable resistance gear drives the wind deflector to rotate.

6. A control method for an indoor unit of an air conditioner, characterized in that: The indoor unit of the air conditioner includes a motor, a wind deflector, and a variable resistance device; the variable resistance device is connected to the power supply circuit; when the rotation angle of the motor or the wind deflector changes, the resistance value of the variable resistance device also changes; The variable resistance device includes: A constant resistance gear, which includes a tooth disc and a plurality of teeth with the same resistance value arranged on the outer peripheral surface of the tooth disc; the plurality of teeth of the constant resistance gear are respectively electrically connected to the tooth disc of the constant resistance gear; the tooth disc of the constant resistance gear has a first electrical connection end; A variable resistance gear, which includes a tooth disc and a plurality of teeth arranged on the outer peripheral surface of the tooth disc; the resistance values of the plurality of teeth of the variable resistance gear are different from each other, or among the plurality of teeth of the variable resistance gear, the resistance values of some of the teeth are different from each other, and the resistance values of the remaining teeth are the same; the plurality of teeth of the variable resistance gear are respectively electrically connected to the tooth disc of the variable resistance gear; the tooth disc of the variable resistance gear has a second electrical connection end; Wherein, the first electrical connection end and the second electrical connection end are electrically connected to the power supply circuit; the motor or the wind deflector drives the variable resistance gear or the constant resistance gear to rotate; at the same time, only one tooth of the variable resistance gear and the constant resistance gear meshes; The control method includes: Obtaining the target angle of the wind deflector and the actual current value of the variable resistance device; According to the preset corresponding relationship between the wind deflector angle and the current value of the variable resistance device, obtaining the target current value of the variable resistance device corresponding to the target angle of the wind deflector; Judging whether the actual current value of the variable resistance device is equal to the target current value; If the actual current value of the variable resistance device is not equal to the target current value, the motor drives the wind deflector to continue rotating; If the actual current value of the variable resistance device is equal to the target current value, the motor and the wind deflector stop rotating.

7. The control method according to claim 6, characterized in that: The corresponding relationship between the wind deflector angle and the current value of the variable resistance device is a corresponding table or a relationship curve.

8. The control method according to claim 7, characterized in that: When presetting the corresponding relationship between the wind deflector angle and the current value of the variable resistance device, during the process of the motor driving the wind deflector to rotate from the minimum angle to the maximum angle, every time the rotation angle of the wind deflector increases by a set step length, record the rotation angle of the wind deflector and the current value of the variable resistance device, and form a corresponding table of the wind deflector angle and the current value of the variable resistance device.

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