Air conditioner indoor unit and method for controlling condensation on air guide blades

Abstract

The present invention relates to the field of refrigeration engineering technology, and specifically to an air conditioner indoor unit and a method for controlling condensation on an air guide blade. The present invention provides an air conditioner indoor unit, comprising an air duct, a cross-flow fan located in the air duct, a heat exchanger located on the air suction side of the cross-flow fan, a plurality of air guide blades located on the air outlet side of the cross-flow fan and rotatably connected to the air duct, and an electric heating device located in the air duct; the electric heating device comprises an electric heating element and heat dissipation fins arranged on the outer surface of the electric heating element; the electric heating device is arranged on the air outlet side of the cross-flow fan and is located next to the air guide blade; the length direction of the electric heating element is parallel to the width direction of the air conditioner indoor unit, and the electric heating element is composed of multiple independently controlled electric heating sections; a second temperature sensor is arranged on each of the multiple air guide blades; the air conditioner indoor unit also comprises a control system, and the electric heating device and the second temperature sensor are both electrically connected to the control system. After adopting the present invention, condensation can be avoided on the electric heating device and the air guide blade.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning and refrigeration, and in particular relates to an air conditioning indoor unit and a method for controlling condensation on air guide blades. Background Art

[0002] In the prior art, since the startup time of the air conditioning system is relatively long, in the indoor heating mode in winter, the heating feedback time may be relatively long or the temperature may rise slowly, so an electric heating device is often used to provide supplementary heat. Generally, the electric heating device is arranged near the heat exchanger of the indoor unit of the air conditioner. For example, the electric heating device of the indoor unit of the wall mounted air conditioner is generally installed between the heat exchanger and the cross flow fan.

[0003] In the actual use of electric heating, when the air conditioner is in cooling operation, the indoor air passes through the air inlet of the air conditioner, and becomes cold air after heat exchange in the heat exchanger. Part of the cold air will pass through the electric heating device and blow out from the air outlet along with the cross-flow fan. Because the air temperature on the suction side is high, when the electric heating device is not working, the temperature is also low under the low temperature radiation of the surrounding heat exchanger, and condensation will occur when it encounters cold air. When the air conditioner is used in summer, the air conditioner is frequently turned on for cooling, which will cause more and more condensed water at the electric heating device. When the air conditioner wind speed is high, the condensed water on the electric heating device may be blown out directly and drip into the room, affecting the user's air conditioning experience. At the same time, the long-term presence of condensed water on the electric heating device may cause oxidation and rust of the metal parts of the electric heating device, shorten its service life, and pose certain safety hazards. It is also easy to cause the electric heating device to be in a humid state for a long time, forming mildew, causing the air blown out of the air conditioner to have a musty smell.

[0004] In addition, air guide blades are provided at the air outlet of the air conditioner to guide the airflow. When the air conditioner is cooling, condensation may also occur on the air guide blades, affecting the user's air conditioning experience. Summary of the invention

[0005] The technical problem to be solved by the present invention is: the present invention provides an air conditioner indoor unit which can avoid condensation of an electric heating device, and at the same time provides a method for controlling condensation on an air guide blade.

[0006] The technical solution adopted by the present invention to solve its technical problem is: the present invention provides an air-conditioning indoor unit, including an air duct, a cross-flow fan located in the air duct, a heat exchanger located on the air suction side of the cross-flow fan, a plurality of wind guide swing blades located on the air outlet side of the cross-flow fan and rotatably connected to the air duct, and an electric heating device located in the air duct; the electric heating device includes an electric heating element and heat dissipation fins arranged on the outer surface of the electric heating element; the electric heating device is arranged on the air outlet side of the cross-flow fan and is located next to the wind guide swing blades; the length direction of the electric heating element is parallel to the width direction of the air-conditioning indoor unit, and the electric heating element is composed of a plurality of independently controlled electric heating segments; a second temperature sensor is arranged on each of the plurality of wind guide swing blades; the air-conditioning indoor unit also includes a control system, and the electric heating device and the second temperature sensor are both electrically connected to the control system.

[0007] Furthermore, the number of the electric heating sections is consistent with the number of the air guide blades provided with the second temperature sensor, and each electric heating section corresponds to an air guide blade provided with the second temperature sensor.

[0008] Furthermore, the setting positions of the second temperature sensors on the air guide blades are the same.

[0009] The present invention also provides a method for controlling condensation on an air guide blade, the method using the above-mentioned air conditioner indoor unit to control condensation on the air guide blade, comprising the following steps:

[0010] Step 1, preset a target temperature difference B in the control system;

[0011] Step 2: obtaining the temperature values ​​of each lateral area of ​​the air outlet of the air conditioner through a second temperature sensor;

[0012] Step 3: Calculate the highest and lowest temperatures in the horizontal direction according to the temperature values ​​of each area in the horizontal direction, and then calculate the difference between the highest and lowest temperatures in the horizontal direction, which is the measured temperature difference value B;

[0013] Step 4: If the measured temperature difference B is greater than the target temperature difference B, the control system controls the electric heating section corresponding to the horizontal minimum temperature value to heat until the measured temperature difference B is less than the target temperature difference B; if the measured temperature difference B is less than the target temperature difference B, the electric heating device does not operate.

[0014] Furthermore, a plurality of first temperature sensors are evenly arranged on the periphery of one of the air guide blades; the air conditioner indoor unit also includes an electric heating device driving device, which is connected to the electric heating device driving device. Under the drive of the electric heating device driving device, the electric heating device can rotate around the air guide blade and stop at a designated position; the first temperature sensor and the electric heating device driving device are also electrically connected to the control system.

[0015] Furthermore: the electric heating device also includes two connecting rods, which are respectively arranged at both ends of the electric heating element; one end of the connecting rod is fixedly connected to the electric heating element; the electric heating device driving device is two stepper motors, which are respectively arranged at both ends of the electric heating element, and the stepper motor includes an output shaft and a base; the other end of the connecting rod is fixedly connected to the output shaft of the stepper motor, and the base of the stepper motor is fixedly connected to the air duct.

[0016] The present invention also provides another method for controlling condensation on an air guide blade, the method using the above-mentioned air conditioner indoor unit to control condensation on the air guide blade, comprising the following steps:

[0017] Step 1, preset a target temperature difference A in the control system;

[0018] Step 2: Obtain the temperature values ​​of each longitudinal area on the wind guide blade through the first temperature sensor

[0019] Step 3: Calculate the maximum and minimum temperature values ​​in the longitudinal direction according to the temperature values ​​of each area in the longitudinal direction, and then calculate the difference between the maximum and minimum temperature values ​​in the longitudinal direction, which is the measured temperature difference A;

[0020] Step four, if the measured temperature difference A is greater than the target temperature difference A, the control system controls the electric heating device driving device to drive the electric heating element to rotate to the position area indicated by the lowest temperature value, and then starts all electric heating sections to heat until the measured temperature difference A is less than the target temperature difference A; if the measured temperature difference A is less than the target temperature difference A, the electric heating device driving device and the electric heating device have no action.

[0021] The present invention also provides a method for controlling condensation on an air guide blade, the method using the above-mentioned air conditioner indoor unit to control condensation on the air guide blade, comprising the following steps:

[0022] Step 1: preset a target temperature difference A and a target temperature difference B in the control system;

[0023] Step 2: obtaining the temperature values ​​of each longitudinal area on the air guide blade through the first temperature sensor; obtaining the temperature values ​​of each transverse area of ​​the air outlet of the air conditioner through the second temperature sensor;

[0024] Step 3: Calculate the maximum and minimum temperature values ​​in the longitudinal direction according to the temperature values ​​of each area in the longitudinal direction, and then calculate the difference between the maximum and minimum temperature values ​​in the longitudinal direction, which is the measured temperature difference value A; Calculate the maximum and minimum temperature values ​​in the transverse direction according to the temperature values ​​of each area in the transverse direction, and then calculate the difference between the maximum and minimum temperature values ​​in the transverse direction, which is the measured temperature difference value B;

[0025] Step 4: If the measured temperature difference A is greater than the target temperature difference A, the control system controls the electric heating device driving device to drive the electric heating element to rotate to the position area indicated by the lowest temperature value, and then starts all electric heating sections to heat until the measured temperature difference A is less than the target temperature difference A;

[0026] If the measured temperature difference B is greater than the target temperature difference B, the electric heating device driving device does not act, and the control system controls the electric heating section corresponding to the horizontal minimum temperature value to heat until the measured temperature difference B is less than the target temperature difference B;

[0027] If the measured temperature difference A is smaller than the target temperature difference A and the measured temperature difference B is smaller than the target temperature difference B, the electric heating device driving device and the electric heating device will not operate.

[0028] The present invention also provides a method for controlling condensation on an air guide blade, wherein the method uses the above-mentioned air conditioner indoor unit to control condensation on the air guide blade, and a third temperature sensor is arranged on the heat exchanger, and the third temperature sensor is electrically connected to the control system; and before step 2, the method further includes the following steps:

[0029] Step A, a target temperature value C is also preset in the control system;

[0030] Step B, obtaining a temperature value of the heat exchanger through a third temperature sensor;

[0031] Step C: when the temperature value of the heat exchanger is greater than the set value C, step 2 and its subsequent steps are not started until the temperature value of the heat exchanger is less than the set value C.

[0032] Furthermore, the target temperature value C is any value less than or equal to -10°C.

[0033] The beneficial effects of the present invention are as follows: the present invention provides an air-conditioning indoor unit, the electric heating device of the air-conditioning indoor unit is arranged in the air duct on the air outlet side of the cross-flow fan and is located next to the wind guide swing blade. When the air conditioner is in cooling mode, since the electric heating device is located on the air outlet side of the cross-flow fan, the cold radiation effect of the heat exchanger on the suction side is small, so the temperature of the electric heating device will be higher than the temperature of the heat exchanger and closer to the indoor temperature. At this time, the air temperature on the air outlet side is relatively low because it has been condensed by the heat exchanger on the suction side, and is lower than the temperature of the electric heating device. Therefore, the situation in which the electric heating device often produces condensed water in the cooling mode in summer is avoided.

[0034] At the same time, the present invention arranges a first temperature sensor and a second temperature sensor on the air guide blade, which can monitor the temperatures of each horizontal area and each vertical area of ​​the air outlet of the air conditioner at any time, and then determine whether condensation will be generated on the air guide blade. When it is determined that condensation will be generated on the air guide blade, the electric heating device is controlled to heat the air guide blade, thereby avoiding the generation of condensation on the air guide blade, improving the user's comfort, and bringing a better user experience to the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a front view schematic diagram of an indoor unit of an air conditioner of the present invention;

[0036] Figure 2 is a half-section schematic diagram of an indoor unit of an air conditioner of the present invention;

[0037] Figure 3 It is a schematic diagram of the structure of the motor thermal device;

[0038] Figure 4 yes Figure 3 Schematic diagram of the electric heating device with the heat dissipation fins hidden.

[0039] Marked in the figure are: cross-flow fan 1, heat exchanger 2, wind guide swing blade 3, electric heating device 4, electric heating element 41, electric heating section 411, heat dissipation fin 42, connecting rod 43, first temperature sensor 5, second temperature sensor 6, stepper motor 7, and third temperature sensor 8. DETAILED DESCRIPTION

[0040] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, so as to have a further understanding of the concept of the present invention, the technical problems solved, the technical features constituting the technical solutions and the technical effects brought about. However, it should be noted that the description of these embodiments is illustrative and does not constitute a specific limitation of the present invention.

[0041] The present invention provides an air-conditioning indoor unit, comprising an air duct, a cross-flow fan 1 located in the air duct, a heat exchanger 2 located on the air suction side of the cross-flow fan 1, a plurality of wind guide blades 3 located on the air outlet side of the cross-flow fan 1 and rotatably connected to the air duct, and an electric heating device 4 located in the air duct; the electric heating device 4 comprises an electric heating element 41 and heat dissipation fins 42 arranged on the outer surface of the electric heating element 41; the electric heating device 4 is arranged on the air outlet side of the cross-flow fan 1 and is located next to the wind guide blades 3; the length direction of the electric heating element 41 is parallel to the width direction of the air-conditioning indoor unit, and the electric heating element 41 is composed of a plurality of independently controlled electric heating segments 411; a second temperature sensor 6 is arranged on each of the plurality of wind guide blades 3; the air-conditioning indoor unit also comprises a control system, and the electric heating device 4 and the second temperature sensor 6 are both electrically connected to the control system.

[0042] In the present invention, the electric heating device 4 is installed on the air outlet side of the cross-flow fan 1 and next to the wind guide blade 3. When the air conditioner is in the cooling mode, since the electric heating device 4 is located on the air outlet side of the cross-flow fan 1, the cold radiation effect of the heat exchanger 2 on the suction side is small, and the temperature of the electric heating device 4 will be higher than the temperature of the heat exchanger 2 and closer to the indoor temperature. At this time, the air temperature on the air outlet side is lower than the temperature of the electric heating device 4 because it has been condensed by the heat exchanger 2 on the suction side. Therefore, the electric heating device 4 is prevented from often generating condensed water in the cooling mode in summer.

[0043] The electric heating element 41 in the present invention is an element for electric heating, which is usually composed of an electric heating tube and a PTC heating element arranged in the electric heating tube, and then a heat dissipation fin 42 is arranged on the outer wall of the electric heating tube for heat dissipation. In the prior art, usually, the electric heating element 41 plays the role of auxiliary air conditioning heating, and is arranged in one piece, that is, the electric heating element 41 is not arranged in sections, and when the electric heating element 41 is powered on, the entire section of the electric heating element 41 heats up. In the present invention, the electric heating element 41 not only plays the role of auxiliary heating in winter, but also has the function of heating the air guide blade 3 in summer cooling to prevent condensation from forming on the air guide blade 3. The electric heating element 41 of the present invention is composed of multiple sections of independently controllable electric heating sections 411. After such arrangement, a part of the air guide blade 3 that is prone to condensation can be heated, which is more convenient to use and control, and has less impact on the cooling effect; in the case of winter heating, each section of the electric heating section 411 is turned on, which can also play a good auxiliary heating role.

[0044] In the present invention, in order to accurately determine which air guide blades 3 are prone to condensation in the cooling mode, a second temperature sensor 6 is provided on each of the plurality of air guide blades 3. The second temperature sensor 6 is used to detect the temperature near the blade. By providing the second temperature sensor 6 on the plurality of air guide blades 3, the temperature of each lateral area of ​​the air outlet of the air conditioner can be obtained. It should be understood here that the plurality mentioned here may be that the second temperature sensor 6 is provided on all the air guide blades 3, or the second temperature sensor 6 may be provided on several of the air guide blades 3. Of course, it is preferred that the second temperature sensor 6 is provided on some of the air guide blades 3, and it is a relatively uneconomical approach to provide the second temperature sensor 6 on all the air guide blades 3.

[0045] The air conditioner indoor unit of the present invention further comprises a control system, which is used to collect the temperature collected by the second temperature sensor 6 and to control the electric heating device 4 to be turned on or off.

[0046] Furthermore, as mentioned above, the electric heating element 41 is composed of a plurality of independently controllable electric heating segments 411, and is provided with a plurality of second temperature sensors 6. The second temperature sensor 6 is used to detect the temperature near the air guide blade 3. When it is detected that the temperature in a certain area is too low, the area is heated and heated. Therefore, preferably, the number of electric heating segments 411 is consistent with the number of air guide blades 3 provided with the second temperature sensors 6, and each electric heating segment 411 corresponds to an air guide blade 3 provided with the second temperature sensor 6. The one-to-one correspondence between the electric heating segment 411 and the second temperature sensor 6 makes it easier to control the electric heating segment 411, and can also heat the air guide blade 3 more accurately to avoid condensation.

[0047] The function of the second temperature sensor 6 is to detect the temperature of each area near the air guide blade. The setting of multiple second temperature sensors 6 can reflect the temperature distribution of each area in the horizontal direction of the air outlet of the air conditioner indoor unit, and the obtained temperature value is to be compared and judged. Preferably, in order to accurately reflect the temperature distribution of each area in the horizontal direction of the air outlet of the air conditioner, the setting position of the second temperature sensor 6 on the air guide blade 3 is the same. For example, they are all set in the middle of the air guide blade 3, they are all set at a certain position on the lower edge of the air guide blade 3, and so on.

[0048] The present invention also provides a method for controlling condensation on air guide blades. The method requires the use of the above-mentioned air conditioner indoor unit and comprises the following steps:

[0049] Step 1, preset a target temperature difference B in the control system;

[0050] Step 2: obtaining the temperature values ​​of each lateral area of ​​the air outlet of the air conditioner through the second temperature sensor 6;

[0051] Step 3: Calculate the highest and lowest temperatures in the horizontal direction according to the temperature values ​​of each area in the horizontal direction, and then calculate the difference between the highest and lowest temperatures in the horizontal direction, which is the measured temperature difference value B;

[0052] Step 4: If the measured temperature difference B is greater than the target temperature difference B, the control system controls the electric heating section 411 corresponding to the horizontal minimum temperature value to heat until the measured temperature difference B is less than the target temperature difference B; if the measured temperature difference B is less than the target temperature difference B, the electric heating device 4 does not operate.

[0053] The target temperature difference B is usually preset on the air conditioner indoor unit before it leaves the factory. Of course, the user can also adjust it by himself through the remote control panel or other methods. The target temperature difference B is equivalent to a threshold. When the measured temperature difference B is greater than it, it means that the temperature distribution of the air outlet of the air conditioner is uneven. The temperature near the air guide blade 3 pointed to by the lowest temperature value is too low, and condensation is easily generated on the air guide blade 3. Then the corresponding electric heating section 411 is started to heat the area to avoid condensation. Of course, if the measured temperature difference B is less than the target temperature difference B, it means that the temperature distribution of the air outlet of the air conditioner is uniform, and no condensation will be generated on the air guide blade 3. Since the electric heating device 4 heats the air guide blade 3, the electric heating device 4 is located next to the air guide blade 3.

[0054] The target temperature difference B is usually any value between 3°C and 8°C. Depending on the operating mode of the air conditioner, the target temperature difference B can take different sizes. For example, in the air conditioning cooling mode, the target temperature difference B can be 5°C; in the air conditioning heating mode, the target temperature difference B can be 8°C; in the air conditioning dehumidification mode, the target temperature difference B can be 3°C.

[0055] Furthermore, a plurality of first temperature sensors 5 are evenly arranged on the periphery of one of the air guide blades 3; the air conditioner indoor unit also includes an electric heating device driving device, which is drivingly connected to the electric heating device 4. Under the drive of the electric heating device driving device, the electric heating device 4 can rotate around the air guide blade 3 and stop at a designated position; the first temperature sensor 5 and the electric heating device driving device are also electrically connected to the control system.

[0056] The purpose of evenly arranging multiple first temperature sensors 5 on the periphery of one of the air guide blades 3 is to detect the temperature distribution of each longitudinal area of ​​the air outlet of the air conditioner and judge the temperature of each area on the air guide blade 3. The first temperature sensor 5 is usually arranged on an air guide blade 3 located in the middle of the air outlet of the air conditioner indoor unit.

[0057] There are various structures that can realize the driving connection between the electric heating device driving device and the electric heating device 4, and under the drive of the electric heating device driving device, the electric heating device 4 can rotate around the air guide blade 3 and stop at a specified position. For example, a gear is provided at each end of the electric heating element 41, and n-shaped tooth grooves are provided on the shell at both ends of the air outlet of the air conditioner, and the gear is driven to rotate in the tooth groove by a motor and a connecting rod.

[0058] In the embodiment of the present invention, Figure 1 , 3As shown in , 4, the electric heating device 4 also includes two connecting rods 43, which are respectively arranged at the two ends of the electric heating element 41; one end of the connecting rod 43 is fixedly connected to the electric heating element 41; the electric heating device driving device is two stepper motors 7, which are respectively arranged at the two ends of the electric heating element 41, and the stepper motor 7 includes an output shaft 71 and a base; the other end of the connecting rod 43 is fixedly connected to the output shaft 71 of the stepper motor 7, and the base of the stepper motor 7 is fixedly connected to the air duct. It should be understood by those skilled in the art that the stepper motor 7 can accurately control the rotation angle through pulses, can realize forward and reverse rotation due to positive or negative pulses, can achieve the function of driving the electric heating device 4 to stop at a specified position, and can realize reverse rotation.

[0059] The present invention also provides another method for controlling condensation on air guide blades, which method requires using the air conditioner indoor unit provided with the first temperature sensor 5, and comprises the following steps:

[0060] Step 1, preset a target temperature difference A in the control system;

[0061] Step 2: Obtain the temperature values ​​of each longitudinal area on the wind guide blade 3 through the first temperature sensor 5

[0062] Step 3: Calculate the maximum and minimum temperature values ​​in the longitudinal direction according to the temperature values ​​of each area in the longitudinal direction, and then calculate the difference between the maximum and minimum temperature values ​​in the longitudinal direction, which is the measured temperature difference A;

[0063] Step four, if the measured temperature difference A is greater than the target temperature difference A, the control system controls the electric heating device driving device to drive the electric heating element 41 to rotate to the position area indicated by the lowest temperature value, and then starts all electric heating sections 411 for heating until the measured temperature difference A is less than the target temperature difference A; if the measured temperature difference A is less than the target temperature difference A, the electric heating device driving device and the electric heating device 4 have no action.

[0064] The target temperature difference A is usually preset on the air conditioner indoor unit before it leaves the factory, and of course, the user can adjust it by himself through the remote control panel or the like. When the measured temperature difference A is greater than the target temperature difference A, it indicates that the longitudinal temperature distribution of the air outlet of the air conditioner is uneven, and the temperature of the local area on the wind guide blade corresponding to the lowest temperature value is low, and condensation is easily generated in this area on the wind guide blade 3. Then, the electric heating device driving device is controlled to drive the electric heating element 41 to rotate to the position area pointed to by the lowest temperature value, and then all the electric heating sections 411 are started to heat simultaneously until the measured temperature difference A is less than the target temperature difference A.

[0065] The target temperature difference A is usually any value between 3°C and 10°C. Depending on the operating mode of the air conditioner, the target temperature difference B can take different sizes. For example, in the air conditioning cooling mode, the target temperature difference A can be 8°C; in the air conditioning heating mode, the target temperature difference A can be 10°C; in the air conditioning dehumidification mode, the target temperature difference A can be 3°C.

[0066] The present invention also provides a method for controlling condensation on air guide blades. The method requires the use of the air conditioner indoor unit provided with the first temperature sensor 5, the second temperature sensor 6 and the electric heating device driving device, and comprises the following steps:

[0067] Step 1: preset a target temperature difference A and a target temperature difference B in the control system;

[0068] Step 2: obtaining the temperature values ​​of each longitudinal area on the air guide blade 3 through the first temperature sensor 5; obtaining the temperature values ​​of each transverse area of ​​the air outlet of the air conditioner through the second temperature sensor 6;

[0069] Step 3: Calculate the maximum and minimum temperature values ​​in the longitudinal direction according to the temperature values ​​of each area in the longitudinal direction, and then calculate the difference between the maximum and minimum temperature values ​​in the longitudinal direction, which is the measured temperature difference value A; Calculate the maximum and minimum temperature values ​​in the transverse direction according to the temperature values ​​of each area in the transverse direction, and then calculate the difference between the maximum and minimum temperature values ​​in the transverse direction, which is the measured temperature difference value B;

[0070] Step 4: If the measured temperature difference A is greater than the target temperature difference A, the control system controls the electric heating device driving device to drive the electric heating element 41 to rotate to the position area pointed to by the lowest temperature value, and then starts all the electric heating sections 411 to heat until the measured temperature difference A is less than the target temperature difference A;

[0071] If the measured temperature difference B is greater than the target temperature difference B, the electric heating device driving device does not act, and the control system controls the electric heating section 411 corresponding to the horizontal minimum temperature value to heat until the measured temperature difference B is less than the target temperature difference B;

[0072] If the measured temperature difference A is smaller than the target temperature difference A and the measured temperature difference B is smaller than the target temperature difference B, the electric heating device driving device and the electric heating device 4 do not operate.

[0073] The target temperature difference A and the target temperature difference B are usually preset on the air conditioner indoor unit before it leaves the factory. Of course, the user can also adjust it by himself through the remote control panel. The method uses the first temperature sensor 5 and the second temperature sensor 6 at the same time, and then takes different actions according to the temperature value. The temperature value of each longitudinal area on the air guide blade 3 is obtained through the first temperature sensor 5; the temperature value of each transverse area of ​​the air outlet of the air conditioner is obtained through the second temperature sensor 6; this can avoid condensation on the air guide blade 3 to the greatest extent.

[0074] In the above, the present invention provides three methods for controlling condensation on the wind guide blades. In order to save electricity and simplify the control procedure, the present invention further optimizes the above three methods and provides a new method. The method requires firstly setting a third temperature sensor 8 on the heat exchanger 2, and the third temperature sensor 8 is electrically connected to the control system; the method is set before step 2, and includes the following steps:

[0075] Step A, a target temperature value C is also preset in the control system;

[0076] Step B, obtaining the temperature value of the heat exchanger 2 through the third temperature sensor 8;

[0077] Step C: when the temperature value of the heat exchanger 2 is greater than the set value C, step 2 and its subsequent steps are not started until the temperature value of the heat exchanger 2 is less than the set value C.

[0078] Normally, the target temperature value C is any value less than or equal to -10°C. The third temperature sensor 8 is provided on the heat exchanger 2 to obtain the temperature value of the heat exchanger 2 in advance. When the temperature value of the heat exchanger 2 is lower than the set value C, the air guide blade 3 is prone to condensation. At this time, the first temperature sensor 5 and the second temperature sensor 6 on the air guide blade are turned on, which is conducive to simplifying the control program and saving electricity.

[0079] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling condensation on an air guide blade, for use in an indoor unit of an air conditioner, comprising an air duct, a cross-flow fan (1) located in the air duct, a heat exchanger (2) located on the air suction side of the cross-flow fan (1), a plurality of air guide blades (3) located on the air outlet side of the cross-flow fan (1) and rotatably connected to the air duct, and an electric heating device (4) located in the air duct; the electric heating device (4) comprising an electric heating element (41) and heat dissipation fins (42) arranged on the outer surface of the electric heating element (41); the electric heating device (4) is arranged on the air outlet side of the cross-flow fan (1) and next to the air guide blades (3); the length direction of the electric heating element (41) is parallel to the width direction of the indoor unit of the air conditioner; Features: The electric heating element (41) is composed of a plurality of independently controlled electric heating segments (411); a second temperature sensor (6) is provided on each of the plurality of air guide blades (3); the air conditioner indoor unit further comprises a control system; the electric heating device (4) and the second temperature sensor (6) are both electrically connected to the control system; and the method for controlling condensation on the air guide blades (3) comprises the following steps: Step 1, preset a target temperature difference B in the control system; Step 2: obtaining temperature values ​​of each lateral area of ​​the air outlet of the air conditioner through a second temperature sensor (6); Step 3: Calculate the highest and lowest temperatures in the horizontal direction according to the temperature values ​​of each area in the horizontal direction, and then calculate the difference between the highest and lowest temperatures in the horizontal direction, which is the measured temperature difference value B; Step 4: If the measured temperature difference B is greater than the target temperature difference B, the control system controls the electric heating section (411) corresponding to the horizontal minimum temperature value to heat until the measured temperature difference B is less than the target temperature difference B; if the measured temperature difference B is less than the target temperature difference B, the electric heating device (4) does not operate.

2. The method for controlling condensation on the wind guide blades according to claim 1, Features: A third temperature sensor (8) is provided on the heat exchanger (2), and the third temperature sensor (8) is electrically connected to the control system; and the following steps are also included before step 2: Step A, a target temperature value C is also preset in the control system; Step B, obtaining the temperature value of the heat exchanger (2) through a third temperature sensor (8); Step C: when the temperature value of the heat exchanger (2) is greater than the set value C, step 2 and its subsequent steps are not started until the temperature value of the heat exchanger (2) is less than the set value C.

3. The method for controlling condensation on the wind guide blades according to claim 2, Features: The target temperature value C is equal to -10°C.

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