An air conditioner

Abstract

The present invention discloses an air conditioner of the present invention, which detects the actual air outlet temperature treal in a heating mode; when the actual air outlet temperature treal reaches or exceeds a first air outlet temperature threshold value t1, obtains the air conditioner set temperature tb and the actual return air temperature ta; calculates the difference △Tb‑a between the air conditioner set temperature tb and the actual return air temperature ta; when the difference △Tb‑a reaches or exceeds the set return air difference, turns on an auxiliary heating module and reduces the compressor frequency to reduce the air outlet temperature and prevent the air guide plate from being deformed due to high temperature; when the difference △Tb‑a does not reach or exceed the set return air difference, turns off the auxiliary heating module; the air conditioner of the present invention not only achieves a rapid heating effect of the air conditioner and meets the heating needs of users, but also prevents the air guide plate from being deformed due to high temperature, thereby solving the technical problem of the air guide plate being deformed due to high temperature of the auxiliary heating module.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner. Background Art

[0002] At present, in order to improve the rapid heating effect and low-temperature heating capacity of air-conditioning indoor units, auxiliary electric heaters are often added to the air outlet of the indoor unit.

[0003] As user demands increase, the air outlet of the indoor unit is required to have a wind-guiding effect, so the indoor unit equipped with an auxiliary electric heater and a surface-mounted panel (wind guide plate) appears.

[0004] When used with a surface-mounted panel, the panel is very close to the air outlet. In many cases, the panel is mounted directly on the indoor unit's air outlet. The auxiliary electric heater is also installed at the indoor unit's air outlet, which results in the auxiliary heater being too close to the surface-mounted panel. The auxiliary electric heater is a high-temperature component, and the surface-mounted panel is made of plastic, which is susceptible to deformation due to high temperatures. This can cause the air deflector to deform and prevent proper air flow, or even pose a fire hazard, compromising the safety of the indoor unit. Summary of the Invention

[0005] The present invention provides an air conditioner, which solves the technical problem of deformation of an air guide plate caused by high temperature of an auxiliary heating module.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides an air conditioner, comprising:

[0008] An auxiliary heating module is installed in the air duct of the indoor unit of the air conditioner near the air outlet;

[0009] An air guide plate, which is installed at the air outlet of the indoor unit of the air conditioner;

[0010] A controller configured to:

[0011] In heating mode, the actual outlet air temperature treal on the upstream side of the auxiliary heating module in the air duct is detected;

[0012] When the actual air outlet temperature tactual reaches or exceeds the first air outlet temperature threshold t1, the air conditioner set temperature tb and the actual return air temperature ta at the indoor unit return air outlet are obtained;

[0013] Calculate the difference between the air conditioning set temperature tb and the actual return air temperature ta, △Tb-a; △Tb-a=tb-ta;

[0014] The auxiliary heating module is started and stopped according to the difference △Tb-a:

[0015] When the difference △Tb-a reaches or exceeds the set return air difference, the auxiliary heating module is turned on and the compressor frequency is reduced;

[0016] When the difference △Tb-a does not reach the set return air difference, the auxiliary heating module is turned off.

[0017] In some embodiments of the present application, reducing the compressor frequency specifically includes:

[0018] Calculate the difference Δt between the actual outlet air temperature tactual and the first outlet air temperature threshold t1, Δt=tactual-t1;

[0019] When the difference △t reaches or exceeds the set air outlet difference, the compressor is controlled to reduce the first set frequency;

[0020] When the difference △t does not reach the set air outlet difference, the compressor is controlled to reduce the second set frequency;

[0021] The first set frequency is greater than the second set frequency.

[0022] In some embodiments of the present application, the first set frequency is: (1+Δt / t1)*N, where N is a constant greater than 1.

[0023] In some embodiments of the present application, when the difference Δt reaches or exceeds a set air outlet difference, controlling the compressor to reduce the first set frequency specifically includes:

[0024] When the difference △t reaches or exceeds the set air outlet difference, the current frequency of the compressor is obtained;

[0025] When the current frequency of the compressor reaches above the set frequency threshold, the first set frequency is: (1+△t / t1)*N1; the frequency of the compressor is controlled to decrease by (1+△t / t1)*N1;

[0026] When the current frequency of the compressor does not reach the set frequency threshold, the first set frequency is: (1+△t / t1)*N2; the frequency of the compressor is controlled to decrease by (1+△t / t1)*N2;

[0027] Wherein, N1>N2, and N1 and N2 are constants greater than 1.

[0028] In some embodiments of the present application, when the current frequency of the compressor reaches or exceeds a set frequency threshold, the opening of the outdoor unit electronic expansion valve is increased;

[0029] When the current frequency of the compressor does not reach the set frequency threshold, the opening of the outdoor unit electronic expansion valve is not adjusted.

[0030] In some embodiments of the present application, when the current frequency of the compressor reaches or exceeds a set frequency threshold, increasing the opening of the outdoor unit electronic expansion valve specifically includes:

[0031] When the current frequency of the compressor reaches or exceeds the set frequency threshold, the current opening of the outdoor unit electronic expansion valve is obtained;

[0032] If the current opening is below the set opening threshold, the opening of the electronic expansion valve is adjusted to the set opening threshold;

[0033] If the current opening of the electronic expansion valve is not below the set opening threshold Z, the current opening of the electronic expansion valve is maintained.

[0034] In some embodiments of the present application, the opening threshold is set to any value between 70% and 80% of the full opening of the outdoor unit electronic expansion valve.

[0035] In some embodiments of the present application, after reducing the compressor frequency for a first set time, the actual outlet air temperature on the upstream side of the auxiliary heating module in the air duct is re-detected;

[0036] If the re-detected actual air outlet temperature reaches or exceeds the second air outlet temperature threshold, the air conditioner set temperature tb and the actual return air temperature ta at the indoor unit return air outlet are re-obtained; the difference △Tb-a between the air conditioner set temperature tb and the actual return air temperature ta is recalculated; and the auxiliary heating module is started and stopped again according to the difference △Tb-a;

[0037] The second outlet air temperature threshold is less than the first outlet air temperature threshold t1.

[0038] In some embodiments of the present application, when the auxiliary heating module is turned off because the actual outlet air temperature tactual reaches above the first outlet air temperature threshold t1, the actual outlet air temperature on the upstream side of the auxiliary heating module in the air duct is not detected within a second set time after the auxiliary heating module is turned off.

[0039] In some embodiments of the present application, after the auxiliary heating module is turned off for the second set time, the following steps are further included:

[0040] Re-check the actual air outlet temperature on the upstream side of the auxiliary heating module in the air duct;

[0041] When the re-detected actual outlet air temperature reaches below the third outlet air temperature threshold, the auxiliary heating module is turned on;

[0042] The third air outlet temperature threshold is less than the first air outlet temperature threshold.

[0043] The technical solution of the present invention has the following technical effects compared with the prior art: the air conditioner of the present invention detects the actual air outlet temperature treal in the heating mode; when the actual air outlet temperature treal reaches or exceeds the first air outlet temperature threshold t1, the air conditioner set temperature tb and the actual return air temperature ta are obtained; the difference △Tb-a between the air conditioner set temperature tb and the actual return air temperature ta is calculated; when the difference △Tb-a reaches or exceeds the set return air difference, the auxiliary heating module is turned on and the compressor frequency is reduced to reduce the air outlet temperature to prevent the air guide plate from being deformed due to high temperature; when the difference △Tb-a does not reach or exceed the set return air difference, the auxiliary heating module is turned off; the air conditioner of the present invention not only achieves the effect of rapid heating of the air conditioner and meets the heating needs of users, but also prevents the air guide plate from being deformed due to high temperature, and solves the technical problem of the air guide plate being deformed due to high temperature due to the auxiliary heating module. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0045] Figure 1 A schematic structural diagram of an embodiment of an air conditioner of the present invention;

[0046] Figure 2 This is a schematic diagram of the installation of the auxiliary heating module;

[0047] Figure 3 A flowchart of an embodiment of steps executed by a controller of an air conditioner according to the present invention;

[0048] Figure 4 A flowchart of another embodiment of the steps executed by the controller of the air conditioner of the present invention;

[0049] Figure 5 A flowchart of another embodiment of the steps executed by the controller of the air conditioner of the present invention;

[0050] Figure 6 A flowchart of another embodiment of the steps executed by the controller of the air conditioner of the present invention;

[0051] Figure 7 A flowchart of another embodiment of the steps executed by the controller of the air conditioner of the present invention;

[0052] Figure 8 A flowchart of another embodiment of the steps executed by the controller of the air conditioner of the present invention;

[0053] Figure 9A flowchart of another embodiment of the steps executed by the controller of the air conditioner of the present invention;

[0054] Figure 10 A flowchart of another embodiment of the steps executed by the controller of the air conditioner of the present invention;

[0055] Figure 11 The present invention is a flowchart of another embodiment of the steps executed by the controller of the air conditioner.

[0056] Reference numerals:

[0057] 1. Shell; 1-1. Air outlet; 2. Air guide plate; 3. Auxiliary heating module. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0059] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0060] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0061] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0062] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0063] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0064] In this application, the air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation to cool or heat the indoor space.

[0065] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0066] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser to a lower-pressure liquid. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves cooling by utilizing the latent heat of evaporation to exchange heat with the material being cooled. Throughout this cycle, the air conditioner regulates the temperature of the indoor space.

[0067] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0068] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0069] The air conditioner of this embodiment includes an outdoor unit, an indoor unit, a controller, an auxiliary heating module 3, an air guide plate 2, etc. Figure 1 、 Figure 2 shown.

[0070] An air duct is formed within the indoor unit's housing 1, which includes an air outlet 1-1 and a return air vent. The air outlet 1-1 and the return air vent are each connected to the air duct. An indoor heat exchanger is located within the air duct, between the air outlet 1-1 and the return air vent.

[0071] Auxiliary heating module 3 is installed in the indoor unit's air duct near air outlet 1-1. Auxiliary heating module 3 is located downstream of the indoor heat exchanger. A controller activates and deactivates auxiliary heating module 3. When activated, auxiliary heating module 3 heats the airflow passing through it.

[0072] The air guide plate 2 is installed at the indoor unit air outlet 1-1; the air guide plate 2 swings to adjust the air outlet direction. The air guide plate 2 is located outside the auxiliary heating module 3.

[0073] Experiments simulating the situation in which the auxiliary heating module and the air deflector are installed closest together in an actual assembly confirmed that when the outlet air temperature on the upstream side of the auxiliary heating module in the air duct is t1, the maximum temperature of the air reaching the air deflector after being heated by the auxiliary heating module 3 is t2. With t2 > t1, the air deflector will not deform if the temperature does not exceed t2. However, deformation will occur if the temperature exceeds this value. The auxiliary heating module activation and compressor frequency are controlled by the outlet air temperature on the upstream side of the auxiliary heating module in the air duct to ensure that the maximum temperature at the air deflector does not exceed t2.

[0074] The outlet air temperature upstream of the auxiliary heating module in the air duct, i.e., the temperature of the airflow after heat exchange with the indoor heat exchanger but before passing through the auxiliary heating module, can be measured using a temperature sensor located in the air duct between the indoor heat exchanger and the auxiliary heating module.

[0075] t1 is the first air outlet temperature threshold; tb is the air conditioner set temperature, which is set by the user, and tb>t1.

[0076] A controller configured to:

[0077] In heating mode, the actual outlet air temperature treal on the upstream side of the auxiliary heating module in the air duct is detected;

[0078] When the actual air outlet temperature tactual reaches or exceeds the first air outlet temperature threshold t1, the air conditioner set temperature tb and the actual return air temperature ta of the indoor unit return air outlet are obtained;

[0079] Calculate the difference between the air conditioning set temperature tb and the actual return air temperature ta, △Tb-a; △Tb-a=tb-ta;

[0080] The auxiliary heating module is started and stopped according to the difference △Tb-a:

[0081] When the difference △Tb-a reaches or exceeds the set return air difference, the auxiliary heating module is turned on and the compressor frequency is reduced;

[0082] When the difference △Tb-a does not reach the set return air difference, the auxiliary heating module is turned off.

[0083] Specifically, the controller performs the following steps, see Figure 3 、 Figure 4 、 Figure 5 shown.

[0084] Step S11: In the heating mode, the actual outlet air temperature treal at the upstream side of the auxiliary heating module in the air duct is detected, that is, the air flow temperature between the indoor heat exchanger and the auxiliary heating module is detected.

[0085] Step S12: Determine whether the actual outlet air temperature tact is greater than the first outlet air temperature threshold t1.

[0086] If not, that is, the actual air outlet temperature t does not reach above the first air outlet temperature threshold t1, it means that the air flow temperature after heat exchange by the indoor heat exchanger is low. Even if the auxiliary heating module is turned on, the temperature at the air guide plate is low and will not be deformed due to high temperature. Therefore, step S13 is executed: the auxiliary heating module 3 is controlled to be in the on state to quickly increase the indoor temperature.

[0087] If so, that is, the actual outlet air temperature t reaches above the first outlet air temperature threshold t1, indicating that the air flow temperature after heat exchange by the indoor heat exchanger is relatively high, step S14 is executed: obtaining the air conditioning set temperature tb and the actual return air temperature ta of the indoor unit return air outlet.

[0088] Step S15: Calculate the difference ΔTb-a between the air conditioning set temperature tb and the actual return air temperature ta.

[0089] △Tb-a=tb-ta.

[0090] Step S16: Controlling the start and stop of the auxiliary heating module according to the difference ΔTb-a, specifically including the following steps:

[0091] Step S16-1: Determine whether the difference ΔTb-a reaches or exceeds the set return air difference.

[0092] If so, that is, the difference △Tb-a reaches or exceeds the set return air difference, it means that the actual return air temperature is low. At this time, the room temperature is too low and the auxiliary heating module needs to be turned on to achieve a rapid heating effect. Then, step S16-2 is executed: turn on the auxiliary heating module to achieve a rapid heating effect, and reduce the compressor frequency to reduce the air duct outlet temperature to prevent the air guide plate from deforming due to high temperature.

[0093] If not, that is, the difference ΔTb-a does not reach or exceed the set return air difference, it means that the room temperature is close to the air conditioning set temperature tb and the rapid heating effect of the auxiliary heating module is not needed, then step S16-3 is executed: turning off the auxiliary heating module.

[0094] The air conditioner of this embodiment detects the actual air outlet temperature treal in the heating mode; when the actual air outlet temperature treal reaches or exceeds the first air outlet temperature threshold t1, the air conditioner set temperature tb and the actual return air temperature ta are obtained; the difference △Tb-a between the air conditioner set temperature tb and the actual return air temperature ta is calculated; when the difference △Tb-a reaches or exceeds the set return air difference, the auxiliary heating module is turned on and the compressor frequency is reduced to reduce the air outlet temperature and prevent the air guide plate from being deformed due to high temperature; when the difference △Tb-a does not reach or exceed the set return air difference, the auxiliary heating module is turned off; the air conditioner of this embodiment not only achieves the effect of rapid heating of the air conditioner to meet the user's heating needs, but also prevents the air guide plate from being deformed due to high temperature.

[0095] Assume that the return air difference is set to 5℃.

[0096] When the difference between the air conditioning set temperature tb and the actual return air temperature ta is △Tb-a≥5℃, the auxiliary heating module is turned on and the compressor frequency is reduced.

[0097] When the difference between the air conditioning set temperature tb and the actual return air temperature ta is less than 5°C, the auxiliary heating module is turned off.

[0098] In some embodiments of the present application, reducing the compressor frequency specifically includes the following steps, see Figure 6 shown.

[0099] S16-2-1: Calculate the difference Δt between the actual outlet air temperature tact and the first outlet air temperature threshold t1.

[0100] △t=treal-t1.

[0101] S16-2-2: Determine whether the difference △t reaches or exceeds the set air outlet difference x (e.g., x is 5°C).

[0102] When the difference △t reaches or exceeds the set air outlet difference x, it indicates that the difference △t is large and the actual air outlet temperature t is very high. Therefore, the frequency reduction range of the compressor needs to be large. Then, step S16-2-3 is executed: controlling the compressor to reduce the first set frequency.

[0103] When the difference △t does not reach the set air outlet difference x, it means that the difference △t is small and the actual air outlet temperature t is actually high. Therefore, the frequency reduction amplitude of the compressor should be small, and step S16-2-4 is executed: control the compressor to reduce the second set frequency.

[0104] The first set frequency is greater than the second set frequency.

[0105] By designing the above steps, the magnitude of the compressor frequency reduction is reasonably selected based on the size of the difference △t between the actual outlet air temperature treal and the first outlet air temperature threshold t1. When the difference △t is large, the frequency reduction is rapid; when the difference △t is small, the frequency reduction is slow. This can not only reduce the outlet air temperature by reducing the compressor frequency, but also avoid affecting the heating function of the air conditioner.

[0106] In some embodiments of the present application, the first set frequency is: (1+Δt / t1)*N, where N is a constant greater than 1. For example, N=8.

[0107] Since △t=treal - t1; therefore, the first set frequency = (1+△t / t1)*N = (treal / t1)*N, that is, the greater the actual outlet air temperature treal, the greater the amplitude of the compressor frequency reduction, so as to quickly reduce the outlet air temperature and prevent the air guide plate from deformation due to high temperature.

[0108] In some embodiments of the present application, when the difference Δt reaches or exceeds the set air outlet difference x, the compressor is controlled to reduce the first set frequency, specifically including the following steps, see Figure 7 shown.

[0109] Step S16-2-3-1: When the difference △t reaches or exceeds the set air outlet difference x, the current frequency of the compressor is obtained.

[0110] Step S16-2-3-2: Determine whether the current frequency of the compressor reaches or exceeds the set frequency threshold H11.

[0111] When the current frequency of the compressor reaches above the set frequency threshold H11, it means that the current frequency of the compressor is large, then execute step S16-2-3-3: the first set frequency is (1+△t / t1)*N1; the frequency of the compressor is controlled to be reduced by (1+△t / t1)*N1.

[0112] When the current frequency of the compressor does not reach or exceed the set frequency threshold H11, it indicates that the current frequency of the compressor is relatively low, and step S16-2-3-4 is executed: the first set frequency is (1+△t / t1)*N2; the frequency of the compressor is controlled to be reduced by (1+△t / t1)*N2.

[0113] Wherein, N1>N2, and both N1 and N2 are constants greater than 1. For example, N1=8; N2=6.

[0114] Therefore, when the difference △t between the actual outlet air temperature tactual and the first outlet air temperature threshold t1 is greater than the set outlet air difference x, if the current frequency of the compressor reaches or exceeds the set frequency threshold H11 (for example, H11=90Hz), the first set frequency is relatively large, and the compressor frequency reduction amplitude is large, thereby quickly reducing the outlet air temperature and preventing the air guide plate from deforming due to high temperature; if the current frequency of the compressor does not reach or exceed the set frequency threshold H11, the first set frequency is relatively small, and the compressor frequency reduction amplitude is small.

[0115] In some embodiments of the present application, when the current frequency of the compressor reaches above the set frequency threshold H11, it means that the current frequency of the compressor is large. In addition to controlling the compressor to reduce the frequency, it is also necessary to increase the opening of the outdoor unit's electronic expansion valve to quickly reduce the outlet air temperature.

[0116] When the current frequency of the compressor does not reach the set frequency threshold H11, the compressor is only controlled to reduce the frequency, and the opening of the outdoor unit electronic expansion valve is not adjusted.

[0117] Therefore, when the current compressor frequency reaches or exceeds the set frequency threshold H11, the compressor frequency is controlled to decrease by (1 + △t / t1) * N1, and the opening of the outdoor unit's electronic expansion valve is increased. By controlling the compressor frequency and the opening of the outdoor unit's electronic expansion valve, the outlet air temperature is quickly reduced, preventing deformation of the air guide plate due to high temperature.

[0118] In some embodiments of the present application, when the current frequency of the compressor reaches or exceeds the set frequency threshold H11, the opening of the outdoor unit electronic expansion valve is increased, specifically including the following steps, see Figure 8 、 Figure 9 shown.

[0119] Step S16-2-3-5: When the current frequency of the compressor reaches or exceeds the set frequency threshold H11, the current opening of the outdoor unit electronic expansion valve is obtained.

[0120] Step S16-2-3-6: Determine whether the current opening of the electronic expansion valve is below the set opening threshold Z.

[0121] If the current opening of the electronic expansion valve is below the set opening threshold Z, execute step S16-2-3-7: adjust the opening of the electronic expansion valve to the set opening threshold Z to reduce the outlet air temperature.

[0122] If the current opening of the electronic expansion valve is not below the set opening threshold Z, execute step S16-2-3-8: maintain the current opening of the electronic expansion valve.

[0123] When the current frequency of the compressor reaches or exceeds the set frequency threshold H11, the opening of the outdoor unit electronic expansion valve can be adjusted to a maximum of the set opening threshold Z. If the opening threshold Z is exceeded, the normal heating function of the air conditioner will be affected.

[0124] In some embodiments of the present application, the opening threshold Z is set to any value between 70% and 80% of the full opening of the outdoor unit electronic expansion valve. Assuming that the full opening of the outdoor unit electronic expansion valve is MAX, the opening threshold Z is set to any value within the range of MAX*70% to MAX80%.

[0125] By setting the opening threshold Z to the above range, the compressor frequency can be reduced to reduce the air outlet temperature, while ensuring the normal heating operation of the air conditioner.

[0126] In some embodiments of the present application, in order to avoid frequent start and stop of the auxiliary heating module, after reducing the compressor frequency for a first set time (such as 5 minutes), the actual outlet air temperature on the upstream side of the auxiliary heating module in the air duct is re-detected; if the re-detected actual outlet air temperature reaches above the second outlet air temperature threshold, the air conditioning set temperature tb and the actual return air temperature ta at the indoor unit return air outlet are re-obtained; the difference △Tb-a between the air conditioning set temperature tb and the actual return air temperature ta is recalculated; and the start and stop of the auxiliary heating module are re-controlled according to the difference △Tb-a.

[0127] The second outlet air temperature threshold is less than the first outlet air temperature threshold t1.

[0128] For example, the second outlet air temperature threshold = t1 - 0.5.

[0129] Specifically, after reducing the compressor frequency for the first set time (e.g., 5 minutes), perform the following steps, see Figure 10 shown.

[0130] Step S17: re-detecting the actual outlet air temperature on the upstream side of the auxiliary heating module in the air duct.

[0131] Step S18: Determine whether the re-detected actual air outlet temperature reaches or exceeds a second air outlet temperature threshold.

[0132] If the re-detected actual air outlet temperature reaches or exceeds the second air outlet temperature threshold, the process returns to step S14: acquiring the air conditioning set temperature tb and the actual return air temperature ta of the indoor unit return air outlet.

[0133] If the re-detected actual outlet air temperature does not reach or exceed the second outlet air temperature threshold, the process is exited and step S11 is executed again after a period of time (eg, 10 minutes).

[0134] In some embodiments of the present application, in order to further avoid frequent start-up and shutdown of the auxiliary heating module, when the auxiliary heating module is shut down because the actual outlet air temperature tactual reaches above the first outlet air temperature threshold t1, the actual outlet air temperature on the upstream side of the auxiliary heating module in the air duct is not detected within a second set time (such as 30 minutes) after the auxiliary heating module is shut down, and the start-up and shutdown of the auxiliary heating module is not judged.

[0135] For example, the actual outlet air temperature is not detected within 30 minutes after the auxiliary heating module is turned off.

[0136] In some embodiments of the present application, after the auxiliary heating module is turned off for the second set time, the following steps are performed, see Figure 11 shown.

[0137] Step S21: After the auxiliary heating module is turned off for a second set time, the actual outlet air temperature at the upstream side of the auxiliary heating module in the air duct is re-detected.

[0138] Step S22: Determine whether the re-detected actual outlet air temperature is below a third outlet air temperature threshold.

[0139] When the re-detected actual outlet air temperature reaches below the third outlet air temperature threshold, step S23 is executed: the auxiliary heating module is turned on. After a period of time (eg, 10 minutes), step S11 is executed again.

[0140] When the re-detected actual outlet air temperature does not reach or fall below the third outlet air temperature threshold, step S14 is executed.

[0141] The third outlet air temperature threshold is less than the second outlet air temperature threshold and less than the first outlet air temperature threshold.

[0142] For example, the third outlet air temperature threshold = t1-2, and the second outlet air temperature threshold = t1-0.5.

[0143] By designing the above steps S21 to S23, the auxiliary heating module is further prevented from being frequently started and stopped, and the indoor unit outlet air temperature is prevented from fluctuating around t1.

[0144] The air conditioner of this application optimizes the start and stop conditions of the auxiliary heating module, effectively controlling the high-temperature heating of the auxiliary heating module without increasing costs, and solving the problem of heat-induced deformation of the air deflector. Furthermore, multiple selectable modes can be set based on the material of the air deflector selected from the factory, maximizing the effectiveness of the auxiliary heating module while solving the problem of air deflector deformation caused by the high temperature of the auxiliary heating module.

[0145] Next, through a specific embodiment, the operation logic of the air conditioner of the present application will be described in detail.

[0146] (1) When the actual outlet air temperature is not greater than t1, the auxiliary heating module is always in the on state.

[0147] (2) When the actual outlet air temperature is greater than t1, determine the start and stop of the auxiliary heating module according to the indoor unit return air temperature ta and the air conditioner set temperature tb.

[0148] (21) During heating, when tb - ta ≥ 5, it means that the room temperature is too low at this time, and the auxiliary heating module needs to be turned on to achieve a rapid heating effect. Calculate the difference △t between the actual outlet air temperature t of the indoor unit and t1, and reduce the outlet air temperature by reducing the compressor frequency and controlling the opening of the outdoor unit electronic expansion valve, so as to ensure the on state of the auxiliary heating module.

[0149] When △t > x, where x is the set outlet air difference, which is a set constant, the current compressor frequency is H1, and the adjusted frequency is H2. The compressor frequency is adjusted according to the following formula: H2 = H1 - (1 + △t / t1) * N, where N is a set constant greater than 1.

[0150] When H1 > H11, it means that the current compressor frequency is too high. To quickly reduce the frequency, N takes the value of N1, where H11 is the set frequency threshold, which is a set constant. At the same time, adjust the opening of the outdoor unit electronic expansion valve: when the opening of the electronic expansion valve < z, adjust the opening of the electronic expansion valve to z; when the opening of the electronic expansion valve ≥ z, do not adjust, where z is the set opening threshold, which is a set constant.

[0151] When H1 ≤ H11, N takes the value of N2, and only the compressor frequency is adjusted, and the opening of the outdoor unit electronic expansion valve is not adjusted.

[0152] When △t ≤ x, the current compressor frequency is H1, and the adjusted frequency is H2. The compressor frequency is adjusted according to the following formula: H2 = H1 - M, where M is a set constant. N1 > N2 > M.

[0153] After each such determination and adjustment, after 5 minutes, detect the actual outlet air temperature again; if the actual outlet air temperature < t1 - 0.5, the control ends and exits (2); otherwise, continue to determine the start and stop of the auxiliary heating module according to the indoor unit return air temperature ta and the air conditioner set temperature tb.

[0154] (22) During heating, when tb - ta < 5, it means that the room temperature is already close to the set temperature at this time, and the rapid heating effect of the auxiliary heating module is not required, and the auxiliary heating module is in the off state.

[0155] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any appropriate manner in any one or more embodiments or examples. The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection of the claims.

Claims

1. An air conditioner, characterized in that: include: An auxiliary heating module is installed in the air duct of the indoor unit of the air conditioner near the air outlet; An air guide plate, which is installed at the air outlet of the indoor unit of the air conditioner; A controller configured to: In heating mode, the actual outlet air temperature treal on the upstream side of the auxiliary heating module in the air duct is detected; When the actual air outlet temperature tactual reaches or exceeds the first air outlet temperature threshold t1, the air conditioner set temperature tb and the actual return air temperature ta of the indoor unit return air outlet are obtained; Calculate the difference △Tb-a between the air conditioning set temperature tb and the actual return air temperature ta; △Tb-a=tb-ta; The auxiliary heating module is started and stopped according to the difference △Tb-a: When the difference △Tb-a reaches or exceeds the set return air difference, the auxiliary heating module is turned on and the compressor frequency is reduced; When the difference △Tb-a does not reach the set return air difference, the auxiliary heating module is turned off; The reducing the compressor frequency specifically includes: Calculate the difference Δt between the actual outlet air temperature tactual and the first outlet air temperature threshold t1, Δt=tactual-t1; When the difference △t reaches or exceeds the set air outlet difference, the compressor is controlled to reduce the first set frequency; When the difference △t does not reach the set air outlet difference, the compressor is controlled to reduce the second set frequency; The first set frequency is greater than the second set frequency.

2. The air conditioner according to claim 1, characterized in that: The first set frequency is: (1+△t / t1)*N, where N is a constant greater than 1.

3. The air conditioner according to claim 1, wherein: When the difference Δt reaches or exceeds the set air outlet difference, controlling the compressor to reduce the first set frequency specifically includes: When the difference △t reaches or exceeds the set air outlet difference, the current frequency of the compressor is obtained; When the current frequency of the compressor reaches above the set frequency threshold, the first set frequency is: (1+△t / t1)*N1; the frequency of the compressor is controlled to decrease by (1+△t / t1)*N1; When the current frequency of the compressor does not reach the set frequency threshold, the first set frequency is: (1+△t / t1)*N2; the frequency of the compressor is controlled to decrease by (1+△t / t1)*N2; Wherein, N1>N2, and N1 and N2 are constants greater than 1.

4. The air conditioner according to claim 3, characterized in that: When the current frequency of the compressor reaches above the set frequency threshold, the opening of the outdoor unit's electronic expansion valve is increased; When the current frequency of the compressor does not reach the set frequency threshold, the opening of the outdoor unit electronic expansion valve is not adjusted.

5. The air conditioner according to claim 4, characterized in that: When the current frequency of the compressor reaches or exceeds the set frequency threshold, increasing the opening of the outdoor unit electronic expansion valve specifically includes: When the current frequency of the compressor reaches or exceeds the set frequency threshold, the current opening of the outdoor unit electronic expansion valve is obtained; If the current opening is below the set opening threshold, the opening of the electronic expansion valve is adjusted to the set opening threshold; If the current opening of the electronic expansion valve is not below the set opening threshold Z, the current opening of the electronic expansion valve is maintained.

6. The air conditioner according to claim 5, characterized in that: Set the opening threshold to any value between 70% and 80% of the full opening of the outdoor unit electronic expansion valve.

7. The air conditioner according to claim 1, characterized in that: After reducing the compressor frequency for a first set time, re-detecting the actual outlet air temperature on the upstream side of the auxiliary heating module in the air duct; If the re-detected actual air outlet temperature reaches or exceeds the second air outlet temperature threshold, the air conditioner set temperature tb and the actual return air temperature ta at the indoor unit return air outlet are re-obtained; the difference △Tb-a between the air conditioner set temperature tb and the actual return air temperature ta is recalculated; and the auxiliary heating module is started and stopped again according to the difference △Tb-a; The second outlet air temperature threshold is less than the first outlet air temperature threshold t1.

8. The air conditioner according to claim 1, wherein: When the auxiliary heating module is turned off because the actual outlet air temperature tact reaches above the first outlet air temperature threshold t1, the actual outlet air temperature on the upstream side of the auxiliary heating module in the air duct is not detected within a second set time after the auxiliary heating module is turned off.

9. The air conditioner according to claim 8, characterized in that: After the auxiliary heating module is turned off for the second set time, the method further includes the following steps: Re-check the actual air outlet temperature on the upstream side of the auxiliary heating module in the air duct; When the re-detected actual outlet air temperature reaches below the third outlet air temperature threshold, the auxiliary heating module is turned on; The third air outlet temperature threshold is less than the first air outlet temperature threshold.

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