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 indoor unit of an air conditioner and a method for controlling condensation on an air guide blade. The present invention includes an air duct, a crossflow fan located in the air duct, a heat exchanger located on the air suction side of the crossflow fan, a plurality of air guide blades located on the air outlet side of the crossflow fan, and an electric heating device located in the air duct; it also includes an electric heating device driving device and a control system, the electric heating device is located on the air outlet side of the crossflow fan; the length direction of the electric heating device is parallel to the width direction of the indoor unit of the air conditioner, and the electric heating device driving device is connected to the electric heating 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 specified position; a plurality of temperature sensors are evenly arranged on the periphery of one of the air guide blades; the temperature sensors and the electric heating driving device are both electrically connected to the control system. The adoption of the present invention can avoid condensation on the electric heating device and the air guide blade.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration engineering, and in particular relates to an indoor unit of an air conditioner and a method for controlling condensation on an air guide swing blade. 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 simultaneously avoid condensation on an electric heating device and an air guide blade, and also provides a method for controlling condensation on the 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 blades located on the air outlet side of the cross-flow fan, and an electric heating device located in the air duct; it is characterized in that: it also includes an electric heating device driving device and a control system, the electric heating device is located on the air outlet side of the cross-flow fan; the length direction of the electric heating device is parallel to the width direction of the air-conditioning indoor unit, and the electric heating device driving device is connected to the electric heating device; under the drive of the electric heating device driving device, the electric heating device can rotate around the wind guide blade and stop at a specified position; a plurality of temperature sensors are evenly arranged on the periphery of one of the wind guide blades; the temperature sensor and the electric heating device driving device are both electrically connected to the control system.

[0007] Furthermore: the driving device of the electric heating device is a stepper motor, and the stepper motor includes an output shaft and a base; the electric heating device includes an electric heating element, and the electric heating element includes an electric heating column extending along the width direction of the air-conditioning indoor unit and a plurality of heat dissipation fins perpendicular to the extension direction of the electric heating column and arranged at intervals on the electric heating column; connecting rods are arranged at both ends of the electric heating element, one end of the connecting rod is fixedly connected to the electric heating element, and 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.

[0008] Furthermore, a humidity sensor is also arranged on the wind guide blade provided with the temperature sensor.

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

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

[0011] Step 2: obtaining the temperature value of each area on the air guide blade through a temperature sensor;

[0012] Step 3: Calculate the difference between the highest temperature and the lowest temperature on the air guide blade according to the temperature values ​​of each area on the air guide blade, and the difference is the measured temperature difference;

[0013] Step four, if the measured temperature difference is greater than the target temperature difference, the control system controls the electric heating device driving device to drive the electric heating element to rotate to the position indicated by the lowest temperature value, and starts the electric heating device to heat until the measured temperature difference of the air guide blade is less than the target temperature difference; if the measured temperature difference of the air guide blade is less than the target temperature difference, neither the electric heating device driving device nor the electric heating device will operate.

[0014] Furthermore, the target temperature difference is any value between 5°C and 15°C.

[0015] The present invention also provides another method for controlling condensation on an air guide blade, wherein the method controls condensation on an air guide blade by an air conditioner indoor unit provided with a temperature sensor and a humidity sensor, comprising the following steps:

[0016] Step 1: Pre-store a table of maximum temperature, relative humidity and dew point temperature in the control system;

[0017] Step 2: obtaining the relative humidity value of the air guide blade through a humidity sensor; obtaining the temperature value of each area on the air guide blade through a temperature sensor;

[0018] Step 3, calculating the highest temperature and the lowest temperature on the air guide blade according to the temperature values ​​of each area on the air guide blade;

[0019] Step 4, calculating the dew point temperature value according to the maximum temperature value and the relative humidity value;

[0020] Step five, if the lowest temperature value on the air guide blade is lower than the dew point temperature value, the control system controls the electric heating device driving device to drive the electric heating element to rotate to the position indicated by the lowest temperature value, and starts the electric heating device to heat until the temperature value there is higher than the dew point temperature value; if the lowest temperature value is higher than the dew point temperature value, neither the electric heating device driving device nor the electric heating device will operate.

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

[0022] The present invention provides an air-conditioning indoor unit, in which an electric heating device is arranged in an air duct on an outlet side of a cross-flow fan. When the air-conditioning is in a cooling mode, since the electric heating device is located on the 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 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 generates condensed water in the cooling mode in summer is avoided.

[0023] In the present invention, an electric heating device driving device and a control system are provided at the same time. The electric heating device and the electric heating device driving device are connected in driving manner. The electric heating device can rotate around the air guide blade and stop at a specified position; and a plurality of temperature sensors are evenly arranged on the periphery of one of the air guide blades. After such arrangement, the temperature of each area on the air guide blade can be monitored at any time to determine whether condensation will condense on the air guide blade. When it is determined that condensation will form on the air guide blade, the electric heating device is controlled to rotate to a specified position to heat the air guide blade, thereby avoiding the formation of condensation on the air guide blade, improving the user's comfort, and bringing a better user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a half-section schematic diagram of an indoor unit of an air conditioner of the present invention;

[0025] Figure 2 It is a schematic diagram of an electric heating device and a driving device of the electric heating device.

[0026] 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 column 411, heat dissipation fin 412, temperature sensor 5, humidity sensor 6, stepper motor 7, output shaft 71. DETAILED DESCRIPTION

[0027] 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.

[0028] The present invention provides an air conditioner indoor unit, comprising an air duct, a crossflow fan 1 located in the air duct, a heat exchanger 2 located on the air suction side of the crossflow fan 1, a plurality of wind guide blades 3 located on the air outlet side of the crossflow fan 1, and an electric heating device 4 located in the air duct; further comprising an electric heating device driving device and a control system, wherein the electric heating device 4 is located on the air outlet side of the crossflow fan 1; the length direction of the electric heating device 4 is parallel to the width direction of the air conditioner indoor unit, and the electric heating device driving device 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 wind guide blade 3 and stop at a designated position; a plurality of temperature sensors 5 are evenly arranged on the periphery of one of the wind guide blades 3; the temperature sensor 5 and the electric heating device driving device are both electrically connected to the control system.

[0029] In the present invention, the electric heating device 4 is installed on the air outlet side of the cross-flow fan 1. 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.

[0030] In the present invention, a plurality of temperature sensors are evenly arranged on the periphery of one of the air guide blades 3. It should be understood by those skilled in the art that the temperature sensor 5 can be directly arranged on the edge of the air guide blade 3, for example, by being glued to the edge of the air guide blade 3, or can be arranged on the air guide blade body, for example, by providing a mounting groove on the air guide blade 3. The temperature sensors 5 must be arranged in a plurality and evenly, because it is necessary to detect the temperature conditions of various areas near the air guide blade 3. In the embodiment of the present invention, Figure 1 As shown, a total of four temperature sensors 5 are provided, and the four temperature sensors 5 are respectively provided at the four corners of the wind guide blade 3 .

[0031] In the present invention, the length direction of the electric heating device 4 is parallel to the width direction of the air-conditioning indoor unit. Driven by 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. Those skilled in the art should understand that a rotating shaft is provided at the lower part of the air guide blade 3 to rotate with the air duct. Therefore, the above-mentioned surrounding does not mean 360-degree surrounding in one direction, but will be limited by the rotating shaft of the air guide blade. When it rotates in one direction to the side of the rotating shaft of the air guide blade 3, it rotates in the opposite direction.

[0032] In the present invention, an electric heating device driving device and a control system are provided at the same time. The electric heating device 4 is driven and connected to 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, and a plurality of temperature sensors 5 are evenly arranged on the periphery of one of the air guide blades 3. After such arrangement, the temperature of each area near the air guide blade 3 can be monitored at any time to judge whether condensation will condense on the air guide blade 3. When it is determined that condensation will occur on the air guide blade 3, the electric heating device 4 is controlled to rotate to the position where condensation will occur, and the air in the area is heated, thereby avoiding the formation of condensation on the air guide blade 3, improving the user's comfort, and bringing a better user experience.

[0033] In the present invention, the structures that can realize the electric heating device 4 rotating around the air guide blade 3 and at the specified position are various. For example, protrusions are set at both ends of the electric heating device 4, and slide grooves are set at both ends in the width direction of the air duct. The trajectory of the slide groove is adapted to the rotation path of the electric heating device. The protrusion is driven to slide in the slide groove by means of a stepper motor in conjunction with a connecting rod to realize the function of rotating and stopping the electric heating device 4.

[0034] In an embodiment of the present invention, Figure 2As shown, the driving device of the electric heating device is a stepper motor 7, and the stepper motor 7 includes an output shaft 71 and a base; the electric heating device 4 includes an electric heating element 41, and the electric heating element 41 includes an electric heating column 411 extending along the width direction of the air-conditioning indoor unit and a plurality of heat dissipation fins 412 that are perpendicular to the extension direction of the electric heating column 411 and are spaced apart on the electric heating column 411; connecting rods 42 are provided at both ends of the electric heating element 41, one end of the connecting rod 42 is fixedly connected to the electric heating element 41, and the other end of the connecting rod 42 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.

[0035] It should be understood by those skilled in the art that the stepper motor can accurately control the rotation angle through pulses, can realize forward and reverse rotation due to positive or negative pulses, can drive the electric heating device 4 to stop at a specified position, and can realize reverse rotation. The electric heating element 41 is used for heat generation and heat dissipation, and includes an electric heating column 411 for heat generation and heat dissipation fins 412 for heat dissipation. The structure of the heat dissipation fin 412 is diverse, and it can be mainly divided into an integrated type and a single-piece type. The integrated type means that there is only one heat dissipation fin 412 on the electric heating column 411, and the heat dissipation fin is fixed to the outer surface of the electric heating column 411 by spiral winding or wave-shaped extension. The single-piece type means that a plurality of heat dissipation fins 412 are arranged at intervals on the electric heating column 411, and each piece of heat dissipation fin 412 is fixed to the outer surface of the electric heating column 411. In the present invention, a single-piece heat dissipation fin 412 is used, and the electric heating element 41 includes an electric heating column 411 extending along the width direction of the air conditioner indoor unit and a plurality of heat dissipation fins 412 perpendicular to the extension direction of the electric heating column 411 and spaced apart on the electric heating column 411.

[0036] Furthermore, a humidity sensor 6 is also provided on the wind guide blade 3 on which the temperature sensor 5 is provided.

[0037] The present invention also provides a method for controlling condensation on an air guide blade, the method needs to use the air conditioner indoor unit provided with the temperature sensor, and the method comprises the following steps:

[0038] Step 1, preset a target temperature difference in the control system;

[0039] Step 2: obtaining the temperature value of each area on the air guide blade 3 through the temperature sensor 5;

[0040] Step 3: Calculate the difference between the highest temperature and the lowest temperature on the air guide blade 3 according to the temperature values ​​of each area on the air guide blade 3, and the difference is the measured temperature difference;

[0041] Step four, if the measured temperature difference is greater than the target temperature difference, the control system controls the electric heating device driving device to drive the electric heating element 41 to rotate to the position indicated by the lowest temperature value, and starts the electric heating device 4 to heat until the measured temperature difference of the air guide blade 3 is less than the target temperature difference; if the measured temperature difference of the air guide blade 3 is less than the target temperature difference, the electric heating device driving device and the electric heating device 4 have no action.

[0042] The target temperature difference is any value between 5°C and 15°C. Depending on the operation mode of the air conditioner, the target temperature difference can take different values. For example, in the air conditioner cooling mode, the set value can be 8°C, in the air conditioner heating mode, the set value can be 12°C, and in the air conditioner dehumidification mode, the set value can be 5°C.

[0043] The temperature sensor 5 is used to obtain the temperature values ​​of each area near the high wind swing blade 3. If the measured temperature difference is greater than the target temperature difference, it means that the temperature difference near the air guide swing blade 3 is too large and condensation is very likely to occur. The electric heating element 41 is controlled to rotate to the position indicated by the lowest temperature value, and the electric heating device 4 is started to heat the air in the area until the measured temperature difference of the air guide swing blade 3 is less than the target temperature difference.

[0044] The present invention also provides another method for controlling condensation on the air guide blades. The method requires using the air conditioner indoor unit provided with the temperature sensor 5 and the humidity sensor 6 to control the condensation on the air guide blades. The method comprises the following steps:

[0045] Step 1: Pre-store a table of maximum temperature, relative humidity and dew point temperature in the control system;

[0046] Step 2: obtaining the relative humidity value of the air guide blade 3 through the humidity sensor 6; obtaining the temperature value of each area on the air guide blade 3 through the temperature sensor 5;

[0047] Step 3, according to the temperature values ​​of each area on the air guide blade 3, the highest temperature and the lowest temperature on the air guide blade 3 are calculated;

[0048] Step 4: Calculate the dew point temperature value according to the maximum temperature value and the relative humidity value; the dew point temperature value is obtained by querying the corresponding table of maximum temperature, relative humidity and dew point temperature;

[0049] Step five, if the minimum temperature value on the air guide blade 3 is lower than the dew point temperature value, the control system controls the electric heating device driving device to drive the electric heating element to rotate to the position indicated by the minimum temperature value, and starts the electric heating device 4 to heat until the temperature value there is higher than the dew point temperature value; if the minimum temperature value is higher than the dew point temperature value, neither the electric heating device driving device nor the electric heating device 4 will operate.

[0050] If the lowest temperature on the wind guide blade 3 is lower than the dew point temperature, it means that the area corresponding to the lowest temperature of the wind guide blade 3 is very prone to condensation, and the electric heating element 41 is controlled to rotate to the position indicated by the lowest temperature value, and the electric heating device 4 is started to heat the air in the area until the measured temperature difference of the wind guide blade 3 is lower than the target temperature difference. If the lowest temperature on the wind guide blade 3 is higher than the dew point temperature, condensation will not occur.

[0051] The correspondence table of the above maximum temperature, relative humidity and dew point temperature is shown in Table 1.

[0052] Table 1

[0053]

[0054] 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. 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 discharge side of the cross-flow fan (1), and an electric heating device (4) located in the air duct; Features: It also comprises an electric heating device driving device and a control system, wherein the electric heating device (4) is located at the air outlet side of the cross-flow fan (1); the length direction of the electric heating device (4) is parallel to the width direction of the air conditioner indoor unit, and the electric heating device driving device 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 swing blade (3) and stop at a specified position; a plurality of temperature sensors (5) are evenly arranged on the periphery of one of the air guide swing blades (3); and the temperature sensor (5) and the electric heating device driving device are both electrically connected to the control system.

2. The air conditioner indoor unit according to claim 1, characterized in that: The electric heating device driving device is a stepper motor (7), and the stepper motor (7) comprises an output shaft (71) and a base; the electric heating device (4) comprises an electric heating element (41), and the electric heating element (41) comprises an electric heating column (411) extending along the width direction of the air conditioner indoor unit and a plurality of heat dissipation fins (412) perpendicular to the extension direction of the electric heating column (411) and arranged on the electric heating column (411) at intervals; connecting rods (42) are arranged at both ends of the electric heating element (41), one end of the connecting rod (42) is fixedly connected to the electric heating element (41), and the other end of the connecting rod (42) 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.

3. The air conditioner indoor unit according to any one of claims 1 to 2, characterized in that: A humidity sensor (6) is also arranged on the air guide swing blade (3) on which the temperature sensor (5) is arranged.

4. A method for controlling condensation on air guide blades, characterized in that: The method of controlling condensation on an air guide blade of an air conditioner indoor unit according to any one of claims 1 to 2 comprises the following steps: Step 1, preset a target temperature difference in the control system; Step 2: obtaining the temperature value of each area of ​​the wind guide blade (3) through the temperature sensor (5); Step 3, according to the temperature values ​​of each area on the air guide swing blade (3), the difference between the highest temperature and the lowest temperature on the air guide swing blade (3) is calculated, and the difference is the measured temperature difference; Step 4: If the measured temperature difference is greater than the target temperature difference, the control system controls the electric heating device driving device to drive the electric heating element (41) to rotate to the position indicated by the lowest temperature value, and starts the electric heating device (4) to heat until the measured temperature difference of the air guide blade (3) is less than the target temperature difference; if the measured temperature difference of the air guide blade (3) is less than the target temperature difference, the electric heating device driving device and the electric heating device (4) are inactive.

5. The method for controlling condensation on air guide blades according to claim 4, characterized in that: The target temperature difference is any value between 5°C and 15°C.

6. A method for controlling condensation on air guide blades, characterized in that: The method of controlling condensation on the air guide blades using the air conditioner indoor unit as claimed in claim 3 comprises the following steps: Step 1: Pre-store a table of maximum temperature, relative humidity and dew point temperature in the control system; Step 2: obtaining the relative humidity value of the air guide blade (3) through the humidity sensor (6); obtaining the temperature value of each area on the air guide blade (3) through the temperature sensor (5); Step 3, calculating the highest temperature and the lowest temperature on the air guide blade (3) according to the temperature values ​​of each area on the air guide blade (3); Step 4, calculating the dew point temperature value according to the maximum temperature value and the relative humidity value; Step 5: If the lowest temperature value on the wind guide blade (3) is lower than the dew point temperature value, the control system controls the electric heating device driving device to drive the electric heating element to rotate to the position indicated by the lowest temperature value, and starts the electric heating device (4) to heat until the temperature value at that position is higher than the dew point temperature value; If the minimum temperature value is greater than the dew point temperature value, the electric heating device driving device and the electric heating device (4) will not operate.

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